text: /*
   * Copyright (C) 2004-2012  Internet Systems Consortium, Inc. ("ISC")
   * Copyright (C) 1999-2003  Internet Software Consortium.
   *
   * Permission to use, copy, modify, and/or distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
   * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
   * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
   * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
   * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
   * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
   * PERFORMANCE OF THIS SOFTWARE.
   */
  
  /* $Id$ */
  
  /*! \file */
  
  #include <config.h>
  
  #include <stdlib.h>
  #include <unistd.h>
  #include <limits.h>
  #include <ctype.h>
  #include <sys/types.h>
  #include <sys/stat.h>
  
  #include <isc/app.h>
  #include <isc/base64.h>
  #include <isc/dir.h>
  #include <isc/entropy.h>
  #include <isc/file.h>
  #include <isc/hash.h>
  #include <isc/hex.h>
  #include <isc/httpd.h>
  #include <isc/lex.h>
  #include <isc/parseint.h>
  #include <isc/portset.h>
  #include <isc/print.h>
  #include <isc/refcount.h>
  #include <isc/resource.h>
  #include <isc/sha2.h>
  #include <isc/socket.h>
  #include <isc/stat.h>
  #include <isc/stats.h>
  #include <isc/stdio.h>
  #include <isc/string.h>
  #include <isc/task.h>
  #include <isc/timer.h>
  #include <isc/util.h>
  #include <isc/xml.h>
  
  #include <isccfg/namedconf.h>
  
  #include <bind9/check.h>
  
  #include <dns/acache.h>
  #include <dns/adb.h>
  #include <dns/cache.h>
  #include <dns/db.h>
  #include <dns/dispatch.h>
  #include <dns/dlz.h>
  #include <dns/dns64.h>
  #include <dns/forward.h>
  #include <dns/journal.h>
  #include <dns/keytable.h>
  #include <dns/keyvalues.h>
  #include <dns/lib.h>
  #include <dns/master.h>
  #include <dns/masterdump.h>
  #include <dns/order.h>
  #include <dns/peer.h>
  #include <dns/portlist.h>
  #include <dns/private.h>
  #include <dns/rbt.h>
  #include <dns/rdataclass.h>
  #include <dns/rdataset.h>
  #include <dns/rdatastruct.h>
  #include <dns/resolver.h>
  #include <dns/rootns.h>
  #include <dns/secalg.h>
  #include <dns/stats.h>
  #include <dns/tkey.h>
  #include <dns/tsig.h>
  #include <dns/view.h>
  #include <dns/zone.h>
  #include <dns/zt.h>
  
  #include <dst/dst.h>
  #include <dst/result.h>
  
  #include <named/client.h>
  #include <named/config.h>
  #include <named/control.h>
  #include <named/interfacemgr.h>
  #include <named/log.h>
  #include <named/logconf.h>
  #include <named/lwresd.h>
  #include <named/main.h>
  #include <named/os.h>
  #include <named/server.h>
  #include <named/statschannel.h>
  #include <named/tkeyconf.h>
  #include <named/tsigconf.h>
  #include <named/zoneconf.h>
  #ifdef HAVE_LIBSCF
  #include <named/ns_smf_globals.h>
  #include <stdlib.h>
  #endif
  #include <named/mysqlip.h>
  
  #ifndef PATH_MAX
  #define PATH_MAX 1024
  #endif
  
  /*%
   * Check an operation for failure.  Assumes that the function
   * using it has a 'result' variable and a 'cleanup' label.
   */
  #define CHECK(op) \
  	do { result = (op);					 \
  	       if (result != ISC_R_SUCCESS) goto cleanup;	 \
  	} while (0)
  
  #define CHECKM(op, msg) \
  	do { result = (op);					  \
  	       if (result != ISC_R_SUCCESS) {			  \
  			isc_log_write(ns_g_lctx,		  \
  				      NS_LOGCATEGORY_GENERAL,	  \
  				      NS_LOGMODULE_SERVER,	  \
  				      ISC_LOG_ERROR,		  \
  				      "%s: %s", msg,		  \
  				      isc_result_totext(result)); \
  			goto cleanup;				  \
  		}						  \
  	} while (0)						  \
  
  #define CHECKMF(op, msg, file) \
  	do { result = (op);					  \
  	       if (result != ISC_R_SUCCESS) {			  \
  			isc_log_write(ns_g_lctx,		  \
  				      NS_LOGCATEGORY_GENERAL,	  \
  				      NS_LOGMODULE_SERVER,	  \
  				      ISC_LOG_ERROR,		  \
  				      "%s '%s': %s", msg, file,	  \
  				      isc_result_totext(result)); \
  			goto cleanup;				  \
  		}						  \
  	} while (0)						  \
  
  #define CHECKFATAL(op, msg) \
  	do { result = (op);					  \
  	       if (result != ISC_R_SUCCESS)			  \
  			fatal(msg, result);			  \
  	} while (0)						  \
  
  /*%
   * Maximum ADB size for views that share a cache.  Use this limit to suppress
   * the total of memory footprint, which should be the main reason for sharing
   * a cache.  Only effective when a finite max-cache-size is specified.
   * This is currently defined to be 8MB.
   */
  #define MAX_ADB_SIZE_FOR_CACHESHARE	8388608
  
  struct ns_dispatch {
  	isc_sockaddr_t			addr;
  	unsigned int			dispatchgen;
  	dns_dispatch_t			*dispatch;
  	ISC_LINK(struct ns_dispatch)	link;
  };
  
  struct ns_cache {
  	dns_cache_t			*cache;
  	dns_view_t			*primaryview;
  	isc_boolean_t			needflush;
  	isc_boolean_t			adbsizeadjusted;
  	ISC_LINK(ns_cache_t)		link;
  };
  
  struct dumpcontext {
  	isc_mem_t			*mctx;
  	isc_boolean_t			dumpcache;
  	isc_boolean_t			dumpzones;
  	FILE				*fp;
  	ISC_LIST(struct viewlistentry)	viewlist;
  	struct viewlistentry		*view;
  	struct zonelistentry		*zone;
  	dns_dumpctx_t			*mdctx;
  	dns_db_t			*db;
  	dns_db_t			*cache;
  	isc_task_t			*task;
  	dns_dbversion_t			*version;
  };
  
  struct viewlistentry {
  	dns_view_t			*view;
  	ISC_LINK(struct viewlistentry)	link;
  	ISC_LIST(struct zonelistentry)	zonelist;
  };
  
  struct zonelistentry {
  	dns_zone_t			*zone;
  	ISC_LINK(struct zonelistentry)	link;
  };
  
  /*%
   * Configuration context to retain for each view that allows
   * new zones to be added at runtime.
   */
  struct cfg_context {
  	isc_mem_t *			mctx;
  	cfg_parser_t *			parser;
  	cfg_obj_t *			config;
  	cfg_parser_t *			nzparser;
  	cfg_obj_t *			nzconfig;
  	cfg_aclconfctx_t *		actx;
  };
  
  /*%
   * Holds state information for the initial zone loading process.
   * Uses the isc_refcount structure to count the number of views
   * with pending zone loads, dereferencing as each view finishes.
   */
  typedef struct {
  		ns_server_t *server;
  		isc_refcount_t refs;
  } ns_zoneload_t;
  
  /*
   * These zones should not leak onto the Internet.
   */
  const char *empty_zones[] = {
  	/* RFC 1918 */
  	"10.IN-ADDR.ARPA",
  	"16.172.IN-ADDR.ARPA",
  	"17.172.IN-ADDR.ARPA",
  	"18.172.IN-ADDR.ARPA",
  	"19.172.IN-ADDR.ARPA",
  	"20.172.IN-ADDR.ARPA",
  	"21.172.IN-ADDR.ARPA",
  	"22.172.IN-ADDR.ARPA",
  	"23.172.IN-ADDR.ARPA",
  	"24.172.IN-ADDR.ARPA",
  	"25.172.IN-ADDR.ARPA",
  	"26.172.IN-ADDR.ARPA",
  	"27.172.IN-ADDR.ARPA",
  	"28.172.IN-ADDR.ARPA",
  	"29.172.IN-ADDR.ARPA",
  	"30.172.IN-ADDR.ARPA",
  	"31.172.IN-ADDR.ARPA",
  	"168.192.IN-ADDR.ARPA",
  
  	/* RFC 5735 and RFC 5737 */
  	"0.IN-ADDR.ARPA",	/* THIS NETWORK */
  	"127.IN-ADDR.ARPA",	/* LOOPBACK */
  	"254.169.IN-ADDR.ARPA",	/* LINK LOCAL */
  	"2.0.192.IN-ADDR.ARPA",	/* TEST NET */
  	"100.51.198.IN-ADDR.ARPA",	/* TEST NET 2 */
  	"113.0.203.IN-ADDR.ARPA",	/* TEST NET 3 */
  	"255.255.255.255.IN-ADDR.ARPA",	/* BROADCAST */
  
  	/* Local IPv6 Unicast Addresses */
  	"0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA",
  	"1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA",
  	/* LOCALLY ASSIGNED LOCAL ADDRESS SCOPE */
  	"D.F.IP6.ARPA",
  	"8.E.F.IP6.ARPA",	/* LINK LOCAL */
  	"9.E.F.IP6.ARPA",	/* LINK LOCAL */
  	"A.E.F.IP6.ARPA",	/* LINK LOCAL */
  	"B.E.F.IP6.ARPA",	/* LINK LOCAL */
  
  	/* Example Prefix, RFC 3849. */
  	"8.B.D.0.1.0.0.2.IP6.ARPA",
  
  	NULL
  };
  
  ISC_PLATFORM_NORETURN_PRE static void
  fatal(const char *msg, isc_result_t result) ISC_PLATFORM_NORETURN_POST;
  
  static void
  ns_server_reload(isc_task_t *task, isc_event_t *event);
  
  static isc_result_t
  ns_listenelt_fromconfig(const cfg_obj_t *listener, const cfg_obj_t *config,
  			cfg_aclconfctx_t *actx,
  			isc_mem_t *mctx, ns_listenelt_t **target);
  static isc_result_t
  ns_listenlist_fromconfig(const cfg_obj_t *listenlist, const cfg_obj_t *config,
  			 cfg_aclconfctx_t *actx,
  			 isc_mem_t *mctx, ns_listenlist_t **target);
  
  static isc_result_t
  configure_forward(const cfg_obj_t *config, dns_view_t *view, dns_name_t *origin,
  		  const cfg_obj_t *forwarders, const cfg_obj_t *forwardtype);
  
  static isc_result_t
  configure_alternates(const cfg_obj_t *config, dns_view_t *view,
  		     const cfg_obj_t *alternates);
  
  static isc_result_t
  configure_zone(const cfg_obj_t *config, const cfg_obj_t *zconfig,
  	       const cfg_obj_t *vconfig, isc_mem_t *mctx, dns_view_t *view,
  	       cfg_aclconfctx_t *aclconf, isc_boolean_t added);
  
  static isc_result_t
  add_keydata_zone(dns_view_t *view, const char *directory, isc_mem_t *mctx);
  
  static void
  end_reserved_dispatches(ns_server_t *server, isc_boolean_t all);
  
  static void
  newzone_cfgctx_destroy(void **cfgp);
  
  /*%
   * Configure a single view ACL at '*aclp'.  Get its configuration from
   * 'vconfig' (for per-view configuration) and maybe from 'config'
   */
  static isc_result_t
  configure_view_acl(const cfg_obj_t *vconfig, const cfg_obj_t *config,
  		   const char *aclname, const char *acltuplename,
  		   cfg_aclconfctx_t *actx, isc_mem_t *mctx, dns_acl_t **aclp)
  {
  	isc_result_t result;
  	const cfg_obj_t *maps[3];
  	const cfg_obj_t *aclobj = NULL;
  	int i = 0;
  
  	if (*aclp != NULL)
  		dns_acl_detach(aclp);
  	if (vconfig != NULL)
  		maps[i++] = cfg_tuple_get(vconfig, "options");
  	if (config != NULL) {
  		const cfg_obj_t *options = NULL;
  		(void)cfg_map_get(config, "options", &options);
  		if (options != NULL)
  			maps[i++] = options;
  	}
  	maps[i] = NULL;
  
  	(void)ns_config_get(maps, aclname, &aclobj);
  	if (aclobj == NULL)
  		/*
  		 * No value available.	*aclp == NULL.
  		 */
  		return (ISC_R_SUCCESS);
  
  	if (acltuplename != NULL) {
  		/*
  		 * If the ACL is given in an optional tuple, retrieve it.
  		 * The parser should have ensured that a valid object be
  		 * returned.
  		 */
  		aclobj = cfg_tuple_get(aclobj, acltuplename);
  	}
  
  	result = cfg_acl_fromconfig(aclobj, config, ns_g_lctx,
  				    actx, mctx, 0, aclp);
  
  	return (result);
  }
  
  /*%
   * Configure a sortlist at '*aclp'.  Essentially the same as
   * configure_view_acl() except it calls cfg_acl_fromconfig with a
   * nest_level value of 2.
   */
  static isc_result_t
  configure_view_sortlist(const cfg_obj_t *vconfig, const cfg_obj_t *config,
  			cfg_aclconfctx_t *actx, isc_mem_t *mctx,
  			dns_acl_t **aclp)
  {
  	isc_result_t result;
  	const cfg_obj_t *maps[3];
  	const cfg_obj_t *aclobj = NULL;
  	int i = 0;
  
  	if (*aclp != NULL)
  		dns_acl_detach(aclp);
  	if (vconfig != NULL)
  		maps[i++] = cfg_tuple_get(vconfig, "options");
  	if (config != NULL) {
  		const cfg_obj_t *options = NULL;
  		(void)cfg_map_get(config, "options", &options);
  		if (options != NULL)
  			maps[i++] = options;
  	}
  	maps[i] = NULL;
  
  	(void)ns_config_get(maps, "sortlist", &aclobj);
  	if (aclobj == NULL)
  		return (ISC_R_SUCCESS);
  
  	/*
  	 * Use a nest level of 3 for the "top level" of the sortlist;
  	 * this means each entry in the top three levels will be stored
  	 * as lists of separate, nested ACLs, rather than merged together
  	 * into IP tables as is usually done with ACLs.
  	 */
  	result = cfg_acl_fromconfig(aclobj, config, ns_g_lctx,
  				    actx, mctx, 3, aclp);
  
  	return (result);
  }
  
  static isc_result_t
  configure_view_nametable(const cfg_obj_t *vconfig, const cfg_obj_t *config,
  			 const char *confname, const char *conftuplename,
  			 isc_mem_t *mctx, dns_rbt_t **rbtp)
  {
  	isc_result_t result;
  	const cfg_obj_t *maps[3];
  	const cfg_obj_t *obj = NULL;
  	const cfg_listelt_t *element;
  	int i = 0;
  	dns_fixedname_t fixed;
  	dns_name_t *name;
  	isc_buffer_t b;
  	const char *str;
  	const cfg_obj_t *nameobj;
  
  	if (*rbtp != NULL)
  		dns_rbt_destroy(rbtp);
  	if (vconfig != NULL)
  		maps[i++] = cfg_tuple_get(vconfig, "options");
  	if (config != NULL) {
  		const cfg_obj_t *options = NULL;
  		(void)cfg_map_get(config, "options", &options);
  		if (options != NULL)
  			maps[i++] = options;
  	}
  	maps[i] = NULL;
  
  	(void)ns_config_get(maps, confname, &obj);
  	if (obj == NULL)
  		/*
  		 * No value available.	*rbtp == NULL.
  		 */
  		return (ISC_R_SUCCESS);
  
  	if (conftuplename != NULL) {
  		obj = cfg_tuple_get(obj, conftuplename);
  		if (cfg_obj_isvoid(obj))
  			return (ISC_R_SUCCESS);
  	}
  
  	result = dns_rbt_create(mctx, NULL, NULL, rbtp);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	dns_fixedname_init(&fixed);
  	name = dns_fixedname_name(&fixed);
  	for (element = cfg_list_first(obj);
  	     element != NULL;
  	     element = cfg_list_next(element)) {
  		nameobj = cfg_listelt_value(element);
  		str = cfg_obj_asstring(nameobj);
  		isc_buffer_init(&b, str, strlen(str));
  		isc_buffer_add(&b, strlen(str));
  		CHECK(dns_name_fromtext(name, &b, dns_rootname, 0, NULL));
  		/*
  		 * We don't need the node data, but need to set dummy data to
  		 * avoid a partial match with an empty node.  For example, if
  		 * we have foo.example.com and bar.example.com, we'd get a match
  		 * for baz.example.com, which is not the expected result.
  		 * We simply use (void *)1 as the dummy data.
  		 */
  		result = dns_rbt_addname(*rbtp, name, (void *)1);
  		if (result != ISC_R_SUCCESS) {
  			cfg_obj_log(nameobj, ns_g_lctx, ISC_LOG_ERROR,
  				    "failed to add %s for %s: %s",
  				    str, confname, isc_result_totext(result));
  			goto cleanup;
  		}
  
  	}
  
  	return (result);
  
    cleanup:
  	dns_rbt_destroy(rbtp);
  	return (result);
  
  }
  
  static isc_result_t
  dstkey_fromconfig(const cfg_obj_t *vconfig, const cfg_obj_t *key,
  		  isc_boolean_t managed, dst_key_t **target, isc_mem_t *mctx)
  {
  	dns_rdataclass_t viewclass;
  	dns_rdata_dnskey_t keystruct;
  	isc_uint32_t flags, proto, alg;
  	const char *keystr, *keynamestr;
  	unsigned char keydata[4096];
  	isc_buffer_t keydatabuf;
  	unsigned char rrdata[4096];
  	isc_buffer_t rrdatabuf;
  	isc_region_t r;
  	dns_fixedname_t fkeyname;
  	dns_name_t *keyname;
  	isc_buffer_t namebuf;
  	isc_result_t result;
  	dst_key_t *dstkey = NULL;
  
  	INSIST(target != NULL && *target == NULL);
  
  	flags = cfg_obj_asuint32(cfg_tuple_get(key, "flags"));
  	proto = cfg_obj_asuint32(cfg_tuple_get(key, "protocol"));
  	alg = cfg_obj_asuint32(cfg_tuple_get(key, "algorithm"));
  	keyname = dns_fixedname_name(&fkeyname);
  	keynamestr = cfg_obj_asstring(cfg_tuple_get(key, "name"));
  
  	if (managed) {
  		const char *initmethod;
  		initmethod = cfg_obj_asstring(cfg_tuple_get(key, "init"));
  
  		if (strcasecmp(initmethod, "initial-key") != 0) {
  			cfg_obj_log(key, ns_g_lctx, ISC_LOG_ERROR,
  				    "managed key '%s': "
  				    "invalid initialization method '%s'",
  				    keynamestr, initmethod);
  			result = ISC_R_FAILURE;
  			goto cleanup;
  		}
  	}
  
  	if (vconfig == NULL)
  		viewclass = dns_rdataclass_in;
  	else {
  		const cfg_obj_t *classobj = cfg_tuple_get(vconfig, "class");
  		CHECK(ns_config_getclass(classobj, dns_rdataclass_in,
  					 &viewclass));
  	}
  	keystruct.common.rdclass = viewclass;
  	keystruct.common.rdtype = dns_rdatatype_dnskey;
  	/*
  	 * The key data in keystruct is not dynamically allocated.
  	 */
  	keystruct.mctx = NULL;
  
  	ISC_LINK_INIT(&keystruct.common, link);
  
  	if (flags > 0xffff)
  		CHECKM(ISC_R_RANGE, "key flags");
  	if (proto > 0xff)
  		CHECKM(ISC_R_RANGE, "key protocol");
  	if (alg > 0xff)
  		CHECKM(ISC_R_RANGE, "key algorithm");
  	keystruct.flags = (isc_uint16_t)flags;
  	keystruct.protocol = (isc_uint8_t)proto;
  	keystruct.algorithm = (isc_uint8_t)alg;
  
  	isc_buffer_init(&keydatabuf, keydata, sizeof(keydata));
  	isc_buffer_init(&rrdatabuf, rrdata, sizeof(rrdata));
  
  	keystr = cfg_obj_asstring(cfg_tuple_get(key, "key"));
  	CHECK(isc_base64_decodestring(keystr, &keydatabuf));
  	isc_buffer_usedregion(&keydatabuf, &r);
  	keystruct.datalen = r.length;
  	keystruct.data = r.base;
  
  	if ((keystruct.algorithm == DST_ALG_RSASHA1 ||
  	     keystruct.algorithm == DST_ALG_RSAMD5) &&
  	    r.length > 1 && r.base[0] == 1 && r.base[1] == 3)
  		cfg_obj_log(key, ns_g_lctx, ISC_LOG_WARNING,
  			    "%s key '%s' has a weak exponent",
  			    managed ? "managed" : "trusted",
  			    keynamestr);
  
  	CHECK(dns_rdata_fromstruct(NULL,
  				   keystruct.common.rdclass,
  				   keystruct.common.rdtype,
  				   &keystruct, &rrdatabuf));
  	dns_fixedname_init(&fkeyname);
  	isc_buffer_init(&namebuf, keynamestr, strlen(keynamestr));
  	isc_buffer_add(&namebuf, strlen(keynamestr));
  	CHECK(dns_name_fromtext(keyname, &namebuf, dns_rootname, 0, NULL));
  	CHECK(dst_key_fromdns(keyname, viewclass, &rrdatabuf,
  			      mctx, &dstkey));
  
  	*target = dstkey;
  	return (ISC_R_SUCCESS);
  
   cleanup:
  	if (result == DST_R_NOCRYPTO) {
  		cfg_obj_log(key, ns_g_lctx, ISC_LOG_ERROR,
  			    "ignoring %s key for '%s': no crypto support",
  			    managed ? "managed" : "trusted",
  			    keynamestr);
  	} else if (result == DST_R_UNSUPPORTEDALG) {
  		cfg_obj_log(key, ns_g_lctx, ISC_LOG_WARNING,
  			    "skipping %s key for '%s': %s",
  			    managed ? "managed" : "trusted",
  			    keynamestr, isc_result_totext(result));
  	} else {
  		cfg_obj_log(key, ns_g_lctx, ISC_LOG_ERROR,
  			    "configuring %s key for '%s': %s",
  			    managed ? "managed" : "trusted",
  			    keynamestr, isc_result_totext(result));
  		result = ISC_R_FAILURE;
  	}
  
  	if (dstkey != NULL)
  		dst_key_free(&dstkey);
  
  	return (result);
  }
  
  static isc_result_t
  load_view_keys(const cfg_obj_t *keys, const cfg_obj_t *vconfig,
  	       dns_view_t *view, isc_boolean_t managed,
  	       dns_name_t *keyname, isc_mem_t *mctx)
  {
  	const cfg_listelt_t *elt, *elt2;
  	const cfg_obj_t *key, *keylist;
  	dst_key_t *dstkey = NULL;
  	isc_result_t result;
  	dns_keytable_t *secroots = NULL;
  
  	CHECK(dns_view_getsecroots(view, &secroots));
  
  	for (elt = cfg_list_first(keys);
  	     elt != NULL;
  	     elt = cfg_list_next(elt)) {
  		keylist = cfg_listelt_value(elt);
  
  		for (elt2 = cfg_list_first(keylist);
  		     elt2 != NULL;
  		     elt2 = cfg_list_next(elt2)) {
  			key = cfg_listelt_value(elt2);
  			result = dstkey_fromconfig(vconfig, key, managed,
  						   &dstkey, mctx);
  			if (result ==  DST_R_UNSUPPORTEDALG) {
  				result = ISC_R_SUCCESS;
  				continue;
  			}
  			if (result != ISC_R_SUCCESS)
  				goto cleanup;
  
  			/*
  			 * If keyname was specified, we only add that key.
  			 */
  			if (keyname != NULL &&
  			    !dns_name_equal(keyname, dst_key_name(dstkey)))
  			{
  				dst_key_free(&dstkey);
  				continue;
  			}
  
  			CHECK(dns_keytable_add(secroots, managed, &dstkey));
  		}
  	}
  
   cleanup:
  	if (dstkey != NULL)
  		dst_key_free(&dstkey);
  	if (secroots != NULL)
  		dns_keytable_detach(&secroots);
  	if (result == DST_R_NOCRYPTO)
  		result = ISC_R_SUCCESS;
  	return (result);
  }
  
  /*%
   * Configure DNSSEC keys for a view.
   *
   * The per-view configuration values and the server-global defaults are read
   * from 'vconfig' and 'config'.
   */
  static isc_result_t
  configure_view_dnsseckeys(dns_view_t *view, const cfg_obj_t *vconfig,
  			  const cfg_obj_t *config, const cfg_obj_t *bindkeys,
  			  isc_boolean_t auto_dlv, isc_boolean_t auto_root,
  			  isc_mem_t *mctx)
  {
  	isc_result_t result = ISC_R_SUCCESS;
  	const cfg_obj_t *view_keys = NULL;
  	const cfg_obj_t *global_keys = NULL;
  	const cfg_obj_t *view_managed_keys = NULL;
  	const cfg_obj_t *global_managed_keys = NULL;
  	const cfg_obj_t *maps[4];
  	const cfg_obj_t *voptions = NULL;
  	const cfg_obj_t *options = NULL;
  	const cfg_obj_t *obj = NULL;
  	const char *directory;
  	int i = 0;
  
  	/* We don't need trust anchors for the _bind view */
  	if (strcmp(view->name, "_bind") == 0 &&
  	    view->rdclass == dns_rdataclass_chaos) {
  		return (ISC_R_SUCCESS);
  	}
  
  	if (vconfig != NULL) {
  		voptions = cfg_tuple_get(vconfig, "options");
  		if (voptions != NULL) {
  			(void) cfg_map_get(voptions, "trusted-keys",
  					   &view_keys);
  			(void) cfg_map_get(voptions, "managed-keys",
  					   &view_managed_keys);
  			maps[i++] = voptions;
  		}
  	}
  
  	if (config != NULL) {
  		(void)cfg_map_get(config, "trusted-keys", &global_keys);
  		(void)cfg_map_get(config, "managed-keys", &global_managed_keys);
  		(void)cfg_map_get(config, "options", &options);
  		if (options != NULL) {
  			maps[i++] = options;
  		}
  	}
  
  	maps[i++] = ns_g_defaults;
  	maps[i] = NULL;
  
  	result = dns_view_initsecroots(view, mctx);
  	if (result != ISC_R_SUCCESS) {
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  			      "couldn't create keytable");
  		return (ISC_R_UNEXPECTED);
  	}
  
  	if (auto_dlv && view->rdclass == dns_rdataclass_in) {
  		const cfg_obj_t *builtin_keys = NULL;
  		const cfg_obj_t *builtin_managed_keys = NULL;
  
  		isc_log_write(ns_g_lctx, DNS_LOGCATEGORY_SECURITY,
  			      NS_LOGMODULE_SERVER, ISC_LOG_WARNING,
  			      "using built-in DLV key for view %s",
  			      view->name);
  
  		/*
  		 * If bind.keys exists, it overrides the managed-keys
  		 * clause hard-coded in ns_g_config.
  		 */
  		if (bindkeys != NULL) {
  			(void)cfg_map_get(bindkeys, "trusted-keys",
  					  &builtin_keys);
  			(void)cfg_map_get(bindkeys, "managed-keys",
  					  &builtin_managed_keys);
  		} else {
  			(void)cfg_map_get(ns_g_config, "trusted-keys",
  					  &builtin_keys);
  			(void)cfg_map_get(ns_g_config, "managed-keys",
  					  &builtin_managed_keys);
  		}
  
  		if (builtin_keys != NULL)
  			CHECK(load_view_keys(builtin_keys, vconfig, view,
  					     ISC_FALSE, view->dlv, mctx));
  		if (builtin_managed_keys != NULL)
  			CHECK(load_view_keys(builtin_managed_keys, vconfig,
  					     view, ISC_TRUE, view->dlv, mctx));
  	}
  
  	if (auto_root && view->rdclass == dns_rdataclass_in) {
  		const cfg_obj_t *builtin_keys = NULL;
  		const cfg_obj_t *builtin_managed_keys = NULL;
  
  		isc_log_write(ns_g_lctx, DNS_LOGCATEGORY_SECURITY,
  			      NS_LOGMODULE_SERVER, ISC_LOG_WARNING,
  			      "using built-in root key for view %s",
  			      view->name);
  
  		/*
  		 * If bind.keys exists, it overrides the managed-keys
  		 * clause hard-coded in ns_g_config.
  		 */
  		if (bindkeys != NULL) {
  			(void)cfg_map_get(bindkeys, "trusted-keys",
  					  &builtin_keys);
  			(void)cfg_map_get(bindkeys, "managed-keys",
  					  &builtin_managed_keys);
  		} else {
  			(void)cfg_map_get(ns_g_config, "trusted-keys",
  					  &builtin_keys);
  			(void)cfg_map_get(ns_g_config, "managed-keys",
  					  &builtin_managed_keys);
  		}
  
  		if (builtin_keys != NULL)
  			CHECK(load_view_keys(builtin_keys, vconfig, view,
  					     ISC_FALSE, dns_rootname, mctx));
  		if (builtin_managed_keys != NULL)
  			CHECK(load_view_keys(builtin_managed_keys, vconfig,
  					     view, ISC_TRUE, dns_rootname,
  					     mctx));
  	}
  
  	CHECK(load_view_keys(view_keys, vconfig, view, ISC_FALSE,
  			     NULL, mctx));
  	CHECK(load_view_keys(view_managed_keys, vconfig, view, ISC_TRUE,
  			     NULL, mctx));
  
  	if (view->rdclass == dns_rdataclass_in) {
  		CHECK(load_view_keys(global_keys, vconfig, view, ISC_FALSE,
  				     NULL, mctx));
  		CHECK(load_view_keys(global_managed_keys, vconfig, view,
  				     ISC_TRUE, NULL, mctx));
  	}
  
  	/*
  	 * Add key zone for managed-keys.
  	 */
  	obj = NULL;
  	(void)ns_config_get(maps, "managed-keys-directory", &obj);
  	directory = obj != NULL ? cfg_obj_asstring(obj) : NULL;
  	CHECK(add_keydata_zone(view, directory, ns_g_mctx));
  
    cleanup:
  	return (result);
  }
  
  static isc_result_t
  mustbesecure(const cfg_obj_t *mbs, dns_resolver_t *resolver) {
  	const cfg_listelt_t *element;
  	const cfg_obj_t *obj;
  	const char *str;
  	dns_fixedname_t fixed;
  	dns_name_t *name;
  	isc_boolean_t value;
  	isc_result_t result;
  	isc_buffer_t b;
  
  	dns_fixedname_init(&fixed);
  	name = dns_fixedname_name(&fixed);
  	for (element = cfg_list_first(mbs);
  	     element != NULL;
  	     element = cfg_list_next(element))
  	{
  		obj = cfg_listelt_value(element);
  		str = cfg_obj_asstring(cfg_tuple_get(obj, "name"));
  		isc_buffer_init(&b, str, strlen(str));
  		isc_buffer_add(&b, strlen(str));
  		CHECK(dns_name_fromtext(name, &b, dns_rootname, 0, NULL));
  		value = cfg_obj_asboolean(cfg_tuple_get(obj, "value"));
  		CHECK(dns_resolver_setmustbesecure(resolver, name, value));
  	}
  
  	result = ISC_R_SUCCESS;
  
   cleanup:
  	return (result);
  }
  
  /*%
   * Get a dispatch appropriate for the resolver of a given view.
   */
  static isc_result_t
  get_view_querysource_dispatch(const cfg_obj_t **maps,
  			      int af, dns_dispatch_t **dispatchp,
  			      isc_boolean_t is_firstview)
  {
  	isc_result_t result = ISC_R_FAILURE;
  	dns_dispatch_t *disp;
  	isc_sockaddr_t sa;
  	unsigned int attrs, attrmask;
  	const cfg_obj_t *obj = NULL;
  	unsigned int maxdispatchbuffers;
  
  	switch (af) {
  	case AF_INET:
  		result = ns_config_get(maps, "query-source", &obj);
  		INSIST(result == ISC_R_SUCCESS);
  		break;
  	case AF_INET6:
  		result = ns_config_get(maps, "query-source-v6", &obj);
  		INSIST(result == ISC_R_SUCCESS);
  		break;
  	default:
  		INSIST(0);
  	}
  
  	sa = *(cfg_obj_assockaddr(obj));
  	INSIST(isc_sockaddr_pf(&sa) == af);
  
  	/*
  	 * If we don't support this address family, we're done!
  	 */
  	switch (af) {
  	case AF_INET:
  		result = isc_net_probeipv4();
  		break;
  	case AF_INET6:
  		result = isc_net_probeipv6();
  		break;
  	default:
  		INSIST(0);
  	}
  	if (result != ISC_R_SUCCESS)
  		return (ISC_R_SUCCESS);
  
  	/*
  	 * Try to find a dispatcher that we can share.
  	 */
  	attrs = 0;
  	attrs |= DNS_DISPATCHATTR_UDP;
  	switch (af) {
  	case AF_INET:
  		attrs |= DNS_DISPATCHATTR_IPV4;
  		break;
  	case AF_INET6:
  		attrs |= DNS_DISPATCHATTR_IPV6;
  		break;
  	}
  	if (isc_sockaddr_getport(&sa) == 0) {
  		attrs |= DNS_DISPATCHATTR_EXCLUSIVE;
  		maxdispatchbuffers = 4096;
  	} else {
  		INSIST(obj != NULL);
  		if (is_firstview) {
  			cfg_obj_log(obj, ns_g_lctx, ISC_LOG_INFO,
  				    "using specific query-source port "
  				    "suppresses port randomization and can be "
  				    "insecure.");
  		}
  		maxdispatchbuffers = 1000;
  	}
  
  	attrmask = 0;
  	attrmask |= DNS_DISPATCHATTR_UDP;
  	attrmask |= DNS_DISPATCHATTR_TCP;
  	attrmask |= DNS_DISPATCHATTR_IPV4;
  	attrmask |= DNS_DISPATCHATTR_IPV6;
  
  	disp = NULL;
  	result = dns_dispatch_getudp(ns_g_dispatchmgr, ns_g_socketmgr,
  				     ns_g_taskmgr, &sa, 4096,
  				     maxdispatchbuffers, 32768, 16411, 16433,
  				     attrs, attrmask, &disp);
  	if (result != ISC_R_SUCCESS) {
  		isc_sockaddr_t any;
  		char buf[ISC_SOCKADDR_FORMATSIZE];
  
  		switch (af) {
  		case AF_INET:
  			isc_sockaddr_any(&any);
  			break;
  		case AF_INET6:
  			isc_sockaddr_any6(&any);
  			break;
  		}
  		if (isc_sockaddr_equal(&sa, &any))
  			return (ISC_R_SUCCESS);
  		isc_sockaddr_format(&sa, buf, sizeof(buf));
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  			      "could not get query source dispatcher (%s)",
  			      buf);
  		return (result);
  	}
  
  	*dispatchp = disp;
  
  	return (ISC_R_SUCCESS);
  }
  
  static isc_result_t
  configure_order(dns_order_t *order, const cfg_obj_t *ent) {
  	dns_rdataclass_t rdclass;
  	dns_rdatatype_t rdtype;
  	const cfg_obj_t *obj;
  	dns_fixedname_t fixed;
  	unsigned int mode = 0;
  	const char *str;
  	isc_buffer_t b;
  	isc_result_t result;
  	isc_boolean_t addroot;
  
  	result = ns_config_getclass(cfg_tuple_get(ent, "class"),
  				    dns_rdataclass_any, &rdclass);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	result = ns_config_gettype(cfg_tuple_get(ent, "type"),
  				   dns_rdatatype_any, &rdtype);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	obj = cfg_tuple_get(ent, "name");
  	if (cfg_obj_isstring(obj))
  		str = cfg_obj_asstring(obj);
  	else
  		str = "*";
  	addroot = ISC_TF(strcmp(str, "*") == 0);
  	isc_buffer_init(&b, str, strlen(str));
  	isc_buffer_add(&b, strlen(str));
  	dns_fixedname_init(&fixed);
  	result = dns_name_fromtext(dns_fixedname_name(&fixed), &b,
  				   dns_rootname, 0, NULL);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	obj = cfg_tuple_get(ent, "ordering");
  	INSIST(cfg_obj_isstring(obj));
  	str = cfg_obj_asstring(obj);
  	if (!strcasecmp(str, "fixed"))
  		mode = DNS_RDATASETATTR_FIXEDORDER;
  	else if (!strcasecmp(str, "random"))
  		mode = DNS_RDATASETATTR_RANDOMIZE;
  	else if (!strcasecmp(str, "cyclic"))
  		mode = 0;
  	else
  		INSIST(0);
  
  	/*
  	 * "*" should match everything including the root (BIND 8 compat).
  	 * As dns_name_matcheswildcard(".", "*.") returns FALSE add a
  	 * explicit entry for "." when the name is "*".
  	 */
  	if (addroot) {
  		result = dns_order_add(order, dns_rootname,
  				       rdtype, rdclass, mode);
  		if (result != ISC_R_SUCCESS)
  			return (result);
  	}
  
  	return (dns_order_add(order, dns_fixedname_name(&fixed),
  			      rdtype, rdclass, mode));
  }
  
  static isc_result_t
  configure_peer(const cfg_obj_t *cpeer, isc_mem_t *mctx, dns_peer_t **peerp) {
  	isc_netaddr_t na;
  	dns_peer_t *peer;
  	const cfg_obj_t *obj;
  	const char *str;
  	isc_result_t result;
  	unsigned int prefixlen;
  
  	cfg_obj_asnetprefix(cfg_map_getname(cpeer), &na, &prefixlen);
  
  	peer = NULL;
  	result = dns_peer_newprefix(mctx, &na, prefixlen, &peer);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	obj = NULL;
  	(void)cfg_map_get(cpeer, "bogus", &obj);
  	if (obj != NULL)
  		CHECK(dns_peer_setbogus(peer, cfg_obj_asboolean(obj)));
  
  	obj = NULL;
  	(void)cfg_map_get(cpeer, "provide-ixfr", &obj);
  	if (obj != NULL)
  		CHECK(dns_peer_setprovideixfr(peer, cfg_obj_asboolean(obj)));
  
  	obj = NULL;
  	(void)cfg_map_get(cpeer, "request-ixfr", &obj);
  	if (obj != NULL)
  		CHECK(dns_peer_setrequestixfr(peer, cfg_obj_asboolean(obj)));
  
  	obj = NULL;
  	(void)cfg_map_get(cpeer, "request-nsid", &obj);
  	if (obj != NULL)
  		CHECK(dns_peer_setrequestnsid(peer, cfg_obj_asboolean(obj)));
  
  	obj = NULL;
  	(void)cfg_map_get(cpeer, "edns", &obj);
  	if (obj != NULL)
  		CHECK(dns_peer_setsupportedns(peer, cfg_obj_asboolean(obj)));
  
  	obj = NULL;
  	(void)cfg_map_get(cpeer, "edns-udp-size", &obj);
  	if (obj != NULL) {
  		isc_uint32_t udpsize = cfg_obj_asuint32(obj);
  		if (udpsize < 512)
  			udpsize = 512;
  		if (udpsize > 4096)
  			udpsize = 4096;
  		CHECK(dns_peer_setudpsize(peer, (isc_uint16_t)udpsize));
  	}
  
  	obj = NULL;
  	(void)cfg_map_get(cpeer, "max-udp-size", &obj);
  	if (obj != NULL) {
  		isc_uint32_t udpsize = cfg_obj_asuint32(obj);
  		if (udpsize < 512)
  			udpsize = 512;
  		if (udpsize > 4096)
  			udpsize = 4096;
  		CHECK(dns_peer_setmaxudp(peer, (isc_uint16_t)udpsize));
  	}
  
  	obj = NULL;
  	(void)cfg_map_get(cpeer, "transfers", &obj);
  	if (obj != NULL)
  		CHECK(dns_peer_settransfers(peer, cfg_obj_asuint32(obj)));
  
  	obj = NULL;
  	(void)cfg_map_get(cpeer, "transfer-format", &obj);
  	if (obj != NULL) {
  		str = cfg_obj_asstring(obj);
  		if (strcasecmp(str, "many-answers") == 0)
  			CHECK(dns_peer_settransferformat(peer,
  							 dns_many_answers));
  		else if (strcasecmp(str, "one-answer") == 0)
  			CHECK(dns_peer_settransferformat(peer,
  							 dns_one_answer));
  		else
  			INSIST(0);
  	}
  
  	obj = NULL;
  	(void)cfg_map_get(cpeer, "keys", &obj);
  	if (obj != NULL) {
  		result = dns_peer_setkeybycharp(peer, cfg_obj_asstring(obj));
  		if (result != ISC_R_SUCCESS)
  			goto cleanup;
  	}
  
  	obj = NULL;
  	if (na.family == AF_INET)
  		(void)cfg_map_get(cpeer, "transfer-source", &obj);
  	else
  		(void)cfg_map_get(cpeer, "transfer-source-v6", &obj);
  	if (obj != NULL) {
  		result = dns_peer_settransfersource(peer,
  						    cfg_obj_assockaddr(obj));
  		if (result != ISC_R_SUCCESS)
  			goto cleanup;
  		ns_add_reserved_dispatch(ns_g_server, cfg_obj_assockaddr(obj));
  	}
  
  	obj = NULL;
  	if (na.family == AF_INET)
  		(void)cfg_map_get(cpeer, "notify-source", &obj);
  	else
  		(void)cfg_map_get(cpeer, "notify-source-v6", &obj);
  	if (obj != NULL) {
  		result = dns_peer_setnotifysource(peer,
  						  cfg_obj_assockaddr(obj));
  		if (result != ISC_R_SUCCESS)
  			goto cleanup;
  		ns_add_reserved_dispatch(ns_g_server, cfg_obj_assockaddr(obj));
  	}
  
  	obj = NULL;
  	if (na.family == AF_INET)
  		(void)cfg_map_get(cpeer, "query-source", &obj);
  	else
  		(void)cfg_map_get(cpeer, "query-source-v6", &obj);
  	if (obj != NULL) {
  		result = dns_peer_setquerysource(peer,
  						 cfg_obj_assockaddr(obj));
  		if (result != ISC_R_SUCCESS)
  			goto cleanup;
  		ns_add_reserved_dispatch(ns_g_server, cfg_obj_assockaddr(obj));
  	}
  
  	*peerp = peer;
  	return (ISC_R_SUCCESS);
  
   cleanup:
  	dns_peer_detach(&peer);
  	return (result);
  }
  
  static isc_result_t
  disable_algorithms(const cfg_obj_t *disabled, dns_resolver_t *resolver) {
  	isc_result_t result;
  	const cfg_obj_t *algorithms;
  	const cfg_listelt_t *element;
  	const char *str;
  	dns_fixedname_t fixed;
  	dns_name_t *name;
  	isc_buffer_t b;
  
  	dns_fixedname_init(&fixed);
  	name = dns_fixedname_name(&fixed);
  	str = cfg_obj_asstring(cfg_tuple_get(disabled, "name"));
  	isc_buffer_init(&b, str, strlen(str));
  	isc_buffer_add(&b, strlen(str));
  	CHECK(dns_name_fromtext(name, &b, dns_rootname, 0, NULL));
  
  	algorithms = cfg_tuple_get(disabled, "algorithms");
  	for (element = cfg_list_first(algorithms);
  	     element != NULL;
  	     element = cfg_list_next(element))
  	{
  		isc_textregion_t r;
  		dns_secalg_t alg;
  
  		DE_CONST(cfg_obj_asstring(cfg_listelt_value(element)), r.base);
  		r.length = strlen(r.base);
  
  		result = dns_secalg_fromtext(&alg, &r);
  		if (result != ISC_R_SUCCESS) {
  			isc_uint8_t ui;
  			result = isc_parse_uint8(&ui, r.base, 10);
  			alg = ui;
  		}
  		if (result != ISC_R_SUCCESS) {
  			cfg_obj_log(cfg_listelt_value(element),
  				    ns_g_lctx, ISC_LOG_ERROR,
  				    "invalid algorithm");
  			CHECK(result);
  		}
  		CHECK(dns_resolver_disable_algorithm(resolver, name, alg));
  	}
   cleanup:
  	return (result);
  }
  
  static isc_boolean_t
  on_disable_list(const cfg_obj_t *disablelist, dns_name_t *zonename) {
  	const cfg_listelt_t *element;
  	dns_fixedname_t fixed;
  	dns_name_t *name;
  	isc_result_t result;
  	const cfg_obj_t *value;
  	const char *str;
  	isc_buffer_t b;
  
  	dns_fixedname_init(&fixed);
  	name = dns_fixedname_name(&fixed);
  
  	for (element = cfg_list_first(disablelist);
  	     element != NULL;
  	     element = cfg_list_next(element))
  	{
  		value = cfg_listelt_value(element);
  		str = cfg_obj_asstring(value);
  		isc_buffer_init(&b, str, strlen(str));
  		isc_buffer_add(&b, strlen(str));
  		result = dns_name_fromtext(name, &b, dns_rootname,
  					   0, NULL);
  		RUNTIME_CHECK(result == ISC_R_SUCCESS);
  		if (dns_name_equal(name, zonename))
  			return (ISC_TRUE);
  	}
  	return (ISC_FALSE);
  }
  
  static void
  check_dbtype(dns_zone_t **zonep, unsigned int dbtypec, const char **dbargv,
  	     isc_mem_t *mctx)
  {
  	char **argv = NULL;
  	unsigned int i;
  	isc_result_t result;
  
  	result = dns_zone_getdbtype(*zonep, &argv, mctx);
  	if (result != ISC_R_SUCCESS) {
  		dns_zone_detach(zonep);
  		return;
  	}
  
  	/*
  	 * Check that all the arguments match.
  	 */
  	for (i = 0; i < dbtypec; i++)
  		if (argv[i] == NULL || strcmp(argv[i], dbargv[i]) != 0) {
  			dns_zone_detach(zonep);
  			break;
  		}
  
  	/*
  	 * Check that there are not extra arguments.
  	 */
  	if (i == dbtypec && argv[i] != NULL)
  		dns_zone_detach(zonep);
  	isc_mem_free(mctx, argv);
  }
  
  static isc_result_t
  setquerystats(dns_zone_t *zone, isc_mem_t *mctx, isc_boolean_t on) {
  	isc_result_t result;
  	isc_stats_t *zoneqrystats;
  
  	zoneqrystats = NULL;
  	if (on) {
  		result = isc_stats_create(mctx, &zoneqrystats,
  					  dns_nsstatscounter_max);
  		if (result != ISC_R_SUCCESS)
  			return (result);
  	}
  	dns_zone_setrequeststats(zone, zoneqrystats);
  	if (zoneqrystats != NULL)
  		isc_stats_detach(&zoneqrystats);
  
  	return (ISC_R_SUCCESS);
  }
  
  static ns_cache_t *
  cachelist_find(ns_cachelist_t *cachelist, const char *cachename) {
  	ns_cache_t *nsc;
  
  	for (nsc = ISC_LIST_HEAD(*cachelist);
  	     nsc != NULL;
  	     nsc = ISC_LIST_NEXT(nsc, link)) {
  		if (strcmp(dns_cache_getname(nsc->cache), cachename) == 0)
  			return (nsc);
  	}
  
  	return (NULL);
  }
  
  static isc_boolean_t
  cache_reusable(dns_view_t *originview, dns_view_t *view,
  	       isc_boolean_t new_zero_no_soattl)
  {
  	if (originview->checknames != view->checknames ||
  	    dns_resolver_getzeronosoattl(originview->resolver) !=
  	    new_zero_no_soattl ||
  	    originview->acceptexpired != view->acceptexpired ||
  	    originview->enablevalidation != view->enablevalidation ||
  	    originview->maxcachettl != view->maxcachettl ||
  	    originview->maxncachettl != view->maxncachettl) {
  		return (ISC_FALSE);
  	}
  
  	return (ISC_TRUE);
  }
  
  static isc_boolean_t
  cache_sharable(dns_view_t *originview, dns_view_t *view,
  	       isc_boolean_t new_zero_no_soattl,
  	       unsigned int new_cleaning_interval,
  	       isc_uint32_t new_max_cache_size)
  {
  	/*
  	 * If the cache cannot even reused for the same view, it cannot be
  	 * shared with other views.
  	 */
  	if (!cache_reusable(originview, view, new_zero_no_soattl))
  		return (ISC_FALSE);
  
  	/*
  	 * Check other cache related parameters that must be consistent among
  	 * the sharing views.
  	 */
  	if (dns_cache_getcleaninginterval(originview->cache) !=
  	    new_cleaning_interval ||
  	    dns_cache_getcachesize(originview->cache) != new_max_cache_size) {
  		return (ISC_FALSE);
  	}
  
  	return (ISC_TRUE);
  }
  
  /*
   * Callback from DLZ configure when the driver sets up a writeable zone
   */
  static isc_result_t
  dlzconfigure_callback(dns_view_t *view, dns_zone_t *zone) {
  	dns_name_t *origin = dns_zone_getorigin(zone);
  	dns_rdataclass_t zclass = view->rdclass;
  	isc_result_t result;
  
  	result = dns_zonemgr_managezone(ns_g_server->zonemgr, zone);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  	dns_zone_setstats(zone, ns_g_server->zonestats);
  
  	return (ns_zone_configure_writeable_dlz(view->dlzdatabase,
  						zone, zclass, origin));
  }
  
  static isc_result_t
  dns64_reverse(dns_view_t *view, isc_mem_t *mctx, isc_netaddr_t *na,
  	      unsigned int prefixlen, const char *server,
  	      const char *contact)
  {
  	char *cp;
  	char reverse[48+sizeof("ip6.arpa.")];
  	const char *dns64_dbtype[4] = { "_dns64", "dns64", ".", "." };
  	const char *sep = ": view ";
  	const char *viewname = view->name;
  	const unsigned char *s6;
  	dns_fixedname_t fixed;
  	dns_name_t *name;
  	dns_zone_t *zone = NULL;
  	int dns64_dbtypec = 4;
  	isc_buffer_t b;
  	isc_result_t result;
  
  	REQUIRE(prefixlen == 32 || prefixlen == 40 || prefixlen == 48 ||
  		prefixlen == 56 || prefixlen == 64 || prefixlen == 96);
  
  	if (!strcmp(viewname, "_default")) {
  		sep = "";
  		viewname = "";
  	}
  
  	/*
  	 * Construct the reverse name of the zone.
  	 */
  	cp = reverse;
  	s6 = na->type.in6.s6_addr;
  	while (prefixlen > 0) {
  		prefixlen -= 8;
  		sprintf(cp, "%x.%x.", s6[prefixlen/8] & 0xf,
  			(s6[prefixlen/8] >> 4) & 0xf);
  		cp += 4;
  	}
  	strcat(cp, "ip6.arpa.");
  
  	/*
  	 * Create the actual zone.
  	 */
  	if (server != NULL)
  		dns64_dbtype[2] = server;
  	if (contact != NULL)
  		dns64_dbtype[3] = contact;
  	dns_fixedname_init(&fixed);
  	name = dns_fixedname_name(&fixed);
  	isc_buffer_init(&b, reverse, strlen(reverse));
  	isc_buffer_add(&b, strlen(reverse));
  	CHECK(dns_name_fromtext(name, &b, dns_rootname, 0, NULL));
  	CHECK(dns_zone_create(&zone, mctx));
  	CHECK(dns_zone_setorigin(zone, name));
  	dns_zone_setview(zone, view);
  	CHECK(dns_zonemgr_managezone(ns_g_server->zonemgr, zone));
  	dns_zone_setclass(zone, view->rdclass);
  	dns_zone_settype(zone, dns_zone_master);
  	dns_zone_setstats(zone, ns_g_server->zonestats);
  	CHECK(dns_zone_setdbtype(zone, dns64_dbtypec, dns64_dbtype));
  	if (view->queryacl != NULL)
  		dns_zone_setqueryacl(zone, view->queryacl);
  	if (view->queryonacl != NULL)
  		dns_zone_setqueryonacl(zone, view->queryonacl);
  	dns_zone_setdialup(zone, dns_dialuptype_no);
  	dns_zone_setnotifytype(zone, dns_notifytype_no);
  	dns_zone_setoption(zone, DNS_ZONEOPT_NOCHECKNS, ISC_TRUE);
  	CHECK(setquerystats(zone, mctx, ISC_FALSE));	/* XXXMPA */
  	CHECK(dns_view_addzone(view, zone));
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
  		      ISC_LOG_INFO, "dns64 reverse zone%s%s: %s", sep,
  		      viewname, reverse);
  
  cleanup:
  	if (zone != NULL)
  		dns_zone_detach(&zone);
  	return (result);
  }
  
  static isc_result_t
  configure_rpz(dns_view_t *view, const cfg_listelt_t *element,
  	      isc_boolean_t recursive_only_def, dns_ttl_t ttl_def)
  {
  	const cfg_obj_t *rpz_obj, *policy_obj, *obj;
  	const char *str;
  	dns_rpz_zone_t *old, *new;
  	dns_zone_t *zone = NULL;
  	isc_result_t result;
  
  	new = isc_mem_get(view->mctx, sizeof(*new));
  	if (new == NULL) {
  		result = ISC_R_NOMEMORY;
  		goto cleanup;
  	}
  
  	memset(new, 0, sizeof(*new));
  	dns_name_init(&new->origin, NULL);
  	dns_name_init(&new->nsdname, NULL);
  	dns_name_init(&new->cname, NULL);
  	dns_name_init(&new->passthru, NULL);
  	ISC_LIST_INITANDAPPEND(view->rpz_zones, new, link);
  
  	rpz_obj = cfg_listelt_value(element);
  	policy_obj = cfg_tuple_get(rpz_obj, "policy");
  	if (cfg_obj_isvoid(policy_obj)) {
  		new->policy = DNS_RPZ_POLICY_GIVEN;
  	} else {
  		str = cfg_obj_asstring(cfg_tuple_get(policy_obj,
  						     "policy name"));
  		new->policy = dns_rpz_str2policy(str);
  		INSIST(new->policy != DNS_RPZ_POLICY_ERROR);
  	}
  
  	obj = cfg_tuple_get(rpz_obj, "recursive-only");
  	if (cfg_obj_isvoid(obj)) {
  		new->recursive_only = recursive_only_def;
  	} else {
  		new->recursive_only = cfg_obj_asboolean(obj);
  	}
  	if (!new->recursive_only)
  		view->rpz_recursive_only = ISC_FALSE;
  
  	obj = cfg_tuple_get(rpz_obj, "max-policy-ttl");
  	if (cfg_obj_isuint32(obj)) {
  		new->max_policy_ttl = cfg_obj_asuint32(obj);
  	} else {
  		new->max_policy_ttl = ttl_def;
  	}
  
  	str = cfg_obj_asstring(cfg_tuple_get(rpz_obj, "zone name"));
  	result = dns_name_fromstring(&new->origin, str, DNS_NAME_DOWNCASE,
  				     view->mctx);
  	if (result != ISC_R_SUCCESS) {
  		cfg_obj_log(rpz_obj, ns_g_lctx, DNS_RPZ_ERROR_LEVEL,
  			    "invalid zone '%s'", str);
  		goto cleanup;
  	}
  
  	result = dns_name_fromstring2(&new->nsdname, DNS_RPZ_NSDNAME_ZONE,
  				      &new->origin, DNS_NAME_DOWNCASE,
  				      view->mctx);
  	if (result != ISC_R_SUCCESS) {
  		cfg_obj_log(rpz_obj, ns_g_lctx, DNS_RPZ_ERROR_LEVEL,
  			    "invalid zone '%s'", str);
  		goto cleanup;
  	}
  
  	result = dns_name_fromstring(&new->passthru, DNS_RPZ_PASSTHRU_ZONE,
  				     DNS_NAME_DOWNCASE, view->mctx);
  	if (result != ISC_R_SUCCESS) {
  		cfg_obj_log(rpz_obj, ns_g_lctx, DNS_RPZ_ERROR_LEVEL,
  			    "invalid zone '%s'", str);
  		goto cleanup;
  	}
  
  	result = dns_view_findzone(view, &new->origin, &zone);
  	if (result != ISC_R_SUCCESS) {
  		cfg_obj_log(rpz_obj, ns_g_lctx, DNS_RPZ_ERROR_LEVEL,
  			    "unknown zone '%s'", str);
  		goto cleanup;
  	}
  	if (dns_zone_gettype(zone) != dns_zone_master &&
  	    dns_zone_gettype(zone) != dns_zone_slave) {
  		cfg_obj_log(rpz_obj, ns_g_lctx, DNS_RPZ_ERROR_LEVEL,
  			     "zone '%s' is neither master nor slave", str);
  		dns_zone_detach(&zone);
  		result = DNS_R_NOTMASTER;
  		goto cleanup;
  	}
  	dns_zone_detach(&zone);
  
  	for (old = ISC_LIST_HEAD(view->rpz_zones);
  	     old != new;
  	     old = ISC_LIST_NEXT(old, link)) {
  		++new->num;
  		if (dns_name_equal(&old->origin, &new->origin)) {
  			cfg_obj_log(rpz_obj, ns_g_lctx, DNS_RPZ_ERROR_LEVEL,
  				    "duplicate '%s'", str);
  			result = DNS_R_DUPLICATE;
  			goto cleanup;
  		}
  	}
  
  	if (new->policy == DNS_RPZ_POLICY_CNAME) {
  		str = cfg_obj_asstring(cfg_tuple_get(policy_obj, "cname"));
  		result = dns_name_fromstring(&new->cname, str,
  					     DNS_NAME_DOWNCASE, view->mctx);
  		if (result != ISC_R_SUCCESS) {
  			cfg_obj_log(rpz_obj, ns_g_lctx, DNS_RPZ_ERROR_LEVEL,
  				    "invalid cname '%s'", str);
  			goto cleanup;
  		}
  	}
  
  	return (ISC_R_SUCCESS);
  
   cleanup:
  	dns_rpz_view_destroy(view);
  	return (result);
  }
  
  #define CHECK_RRL(obj, cond, pat, val)					\
  	do {								\
  		if (!(cond)) {						\
  			cfg_obj_log(obj, ns_g_lctx, ISC_LOG_ERROR,	\
  				    pat, val);				\
  			result = ISC_R_RANGE;				\
  			goto cleanup;					\
  		    }							\
  	} while (0)
  
  static isc_result_t
  configure_rrl(dns_view_t *view, const cfg_obj_t *config, const cfg_obj_t *map) {
  	const cfg_obj_t *obj;
  	dns_rrl_t *rrl;
  	isc_result_t result;
   	int min_entries, i, j;
  
  	/*
  	 * Most DNS servers have few clients, but intentinally open
  	 * recursive and authoritative servers often have many.
  	 * So start with a small number of entries unless told otherwise
  	 * to reduce cold-start costs.
  	 */
  	min_entries = 1000;
  	obj = NULL;
  	result = cfg_map_get(map, "min-table-size", &obj);
  	if (result == ISC_R_SUCCESS) {
  		min_entries = cfg_obj_asuint32(obj);
  		CHECK_RRL(obj, min_entries > 1,
  			  "invalid '{min-table-size %d;}'", min_entries);
  	}
  	result = dns_rrl_init(&rrl, view, min_entries);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	i = ISC_MAX(10000, min_entries);
  	obj = NULL;
  	result = cfg_map_get(map, "max-table-size", &obj);
  	if (result == ISC_R_SUCCESS) {
  		i = cfg_obj_asuint32(obj);
  		CHECK_RRL(obj, i >= min_entries,
  			  "invalid '{max-table-size %d;}'", i);
  	}
  	rrl->max_entries = i;
  
  	obj = NULL;
  	result = cfg_map_get(map, "responses-per-second", &obj);
  	if (result == ISC_R_SUCCESS) {
  		i = cfg_obj_asuint32(obj);
  		CHECK_RRL(obj, i <= DNS_RRL_MAX_RATE,
  			  "invalid '{responses-per-second %d;}'", i);
  	}
  	rrl->responses_per_second = i;
  	rrl->scaled_responses_per_second = rrl->responses_per_second;
  
  	/*
  	 * The default error rate is the response rate,
  	 * and so off by default.
  	 */
  	i = rrl->responses_per_second;
  	obj = NULL;
  	result = cfg_map_get(map, "errors-per-second", &obj);
  	if (result == ISC_R_SUCCESS) {
  		i = cfg_obj_asuint32(obj);
  		CHECK_RRL(obj, i <= DNS_RRL_MAX_RATE,
  			  "invalid '{errors-per-second %d;}'", i);
  	}
  	rrl->errors_per_second = i;
  	rrl->scaled_errors_per_second = rrl->errors_per_second;
  	/*
  	 * The default NXDOMAIN rate is the response rate,
  	 * and so off by default.
  	 */
  	i = rrl->responses_per_second;
  	obj = NULL;
  	result = cfg_map_get(map, "nxdomains-per-second", &obj);
  	if (result == ISC_R_SUCCESS) {
  		i = cfg_obj_asuint32(obj);
  		CHECK_RRL(obj, i <= DNS_RRL_MAX_RATE,
  			  "invalid '{nxdomains-per-second %d;}'", i);
  	}
  	rrl->nxdomains_per_second = i;
  	rrl->scaled_nxdomains_per_second = rrl->nxdomains_per_second;
  
  	/*
  	 * The all-per-second rate is off by default.
  	 */
  	i = 0;
  	obj = NULL;
  	result = cfg_map_get(map, "all-per-second", &obj);
  	if (result == ISC_R_SUCCESS) {
  		i = cfg_obj_asuint32(obj);
  		CHECK_RRL(obj, i <= DNS_RRL_MAX_RATE,
  			  "invalid '{all-per-second %d;}'", i);
  		CHECK_RRL(obj, i == 0 || (i >= rrl->responses_per_second*4 &&
  					  i >= rrl->errors_per_second*4 &&
  					  i >= rrl->nxdomains_per_second*4),
  			  "'{all-per-second %d;}' must be"
  			  " at least 4 times responses-per-second,"
  			  "errors_per_second, and nxdomains_per_second",
  			  i);
  	}
  	rrl->all_per_second = i;
  	rrl->scaled_all_per_second = rrl->all_per_second;
  
  	i = 2;
  	obj = NULL;
  	result = cfg_map_get(map, "slip", &obj);
  	if (result == ISC_R_SUCCESS) {
  		i = cfg_obj_asuint32(obj);
  		CHECK_RRL(obj, i <= DNS_RRL_MAX_SLIP, "invalid '{slip %d;}'", i);
  	}
  	rrl->slip = i;
  	rrl->scaled_slip = rrl->slip;
  
  	i = 15;
  	obj = NULL;
  	result = cfg_map_get(map, "window", &obj);
  	if (result == ISC_R_SUCCESS) {
  		i = cfg_obj_asuint32(obj);
  		CHECK_RRL(obj, i >= 1 && i <= DNS_RRL_MAX_WINDOW,
  			  "invalid '{window %d;}'", i);
  	}
  	rrl->window = i;
  
  	i = 0;
  	obj = NULL;
  	result = cfg_map_get(map, "qps-scale", &obj);
  	if (result == ISC_R_SUCCESS) {
  		i = cfg_obj_asuint32(obj);
  		CHECK_RRL(obj, i >= 1, "invalid '{qps-scale %d;}'", i);
  	}
  	rrl->qps_scale = i;
  	rrl->qps = 1.0;
  
  	i = 24;
  	obj = NULL;
  	result = cfg_map_get(map, "IPv4-prefix-length", &obj);
  	if (result == ISC_R_SUCCESS) {
  		i = cfg_obj_asuint32(obj);
  		CHECK_RRL(obj, i >= 8 && i <= 32,
  			  "invalid '{IPv4-prefix-length %d;}'", i);
  	}
  	rrl->ipv4_prefixlen = i;
  	if (i == 32)
  		rrl->ipv4_mask = 0xffffffff;
  	else
  		rrl->ipv4_mask = htonl(0xffffffff << (32-i));
  
  	i = 56;
  	obj = NULL;
  	result = cfg_map_get(map, "IPv6-prefix-length", &obj);
  	if (result == ISC_R_SUCCESS) {
  		i = cfg_obj_asuint32(obj);
  		CHECK_RRL(obj, i >= 16 && i <= 128,
  			  "invalid '{IPv6-prefix-length %d;}'", i);
  	}
  	rrl->ipv6_prefixlen = i;
  	memset(rrl->ipv6_mask, 0xff, sizeof(rrl->ipv6_mask));
  	for (j = 0; j < 4; ++j) {
  		if (i == 0) {
  			rrl->ipv6_mask[j] = 0;
  		} else if (i < 32) {
  			rrl->ipv6_mask[j] = htonl(0xffffffff << (32-i));
  			i = 0;
  		} else {
  			rrl->ipv6_mask[j] = 0xffffffff;
  			i -= 32;
  		}
  	}
  
  	obj = NULL;
  	result = cfg_map_get(map, "exempt-clients", &obj);
  	if (result == ISC_R_SUCCESS) {
  		result = cfg_acl_fromconfig(obj, config, ns_g_lctx,
  					    ns_g_aclconfctx, ns_g_mctx,
  					    0, &rrl->exempt);
  		CHECK_RRL(obj, result == ISC_R_SUCCESS,
  			  "invalid %s", "address_match_list");
  	}
  
  	obj = NULL;
  	result = cfg_map_get(map, "log-only", &obj);
  	if (result == ISC_R_SUCCESS && cfg_obj_asboolean(obj))
  		rrl->log_only = ISC_TRUE;
  	else
  		rrl->log_only = ISC_FALSE;
  
  	return (ISC_R_SUCCESS);
  
   cleanup:
  	dns_rrl_view_destroy(view);
  	return (result);
  }
  
  /*
   * Configure 'view' according to 'vconfig', taking defaults from 'config'
   * where values are missing in 'vconfig'.
   *
   * When configuring the default view, 'vconfig' will be NULL and the
   * global defaults in 'config' used exclusively.
   */
  static isc_result_t
  configure_view(dns_view_t *view, cfg_obj_t *config, cfg_obj_t *vconfig,
  	       ns_cachelist_t *cachelist, const cfg_obj_t *bindkeys,
  	       isc_mem_t *mctx, cfg_aclconfctx_t *actx,
  	       isc_boolean_t need_hints)
  {
  	const cfg_obj_t *maps[4];
  	const cfg_obj_t *cfgmaps[3];
  	const cfg_obj_t *optionmaps[3];
  	const cfg_obj_t *options = NULL;
  	const cfg_obj_t *voptions = NULL;
  	const cfg_obj_t *forwardtype;
  	const cfg_obj_t *forwarders;
  	const cfg_obj_t *alternates;
  	const cfg_obj_t *zonelist;
  	const cfg_obj_t *dlz;
  	unsigned int dlzargc;
  	char **dlzargv;
  	const cfg_obj_t *disabled;
  	const cfg_obj_t *obj;
  	const cfg_listelt_t *element;
  	in_port_t port;
  	dns_cache_t *cache = NULL;
  	isc_result_t result;
  	isc_uint32_t max_adb_size;
  	unsigned int cleaning_interval;
  	isc_uint32_t max_cache_size;
  	isc_uint32_t max_acache_size;
  	isc_uint32_t lame_ttl;
  	dns_tsig_keyring_t *ring = NULL;
  	dns_view_t *pview = NULL;	/* Production view */
  	isc_mem_t *cmctx = NULL, *hmctx = NULL;
  	dns_dispatch_t *dispatch4 = NULL;
  	dns_dispatch_t *dispatch6 = NULL;
  	isc_boolean_t reused_cache = ISC_FALSE;
  	isc_boolean_t shared_cache = ISC_FALSE;
  	int i = 0, j = 0, k = 0;
  	const char *str;
  	const char *cachename = NULL;
  	dns_order_t *order = NULL;
  	isc_uint32_t udpsize;
  	isc_uint32_t maxbits;
  	unsigned int resopts = 0;
  	dns_zone_t *zone = NULL;
  	isc_uint32_t max_clients_per_query;
  	const char *sep = ": view ";
  	const char *viewname = view->name;
  	const char *forview = " for view ";
  	isc_boolean_t empty_zones_enable;
  	const cfg_obj_t *disablelist = NULL;
  	isc_stats_t *resstats = NULL;
  	dns_stats_t *resquerystats = NULL;
  	isc_boolean_t auto_dlv = ISC_FALSE;
  	isc_boolean_t auto_root = ISC_FALSE;
  	ns_cache_t *nsc;
  	isc_boolean_t zero_no_soattl;
  	dns_acl_t *clients = NULL, *mapped = NULL, *excluded = NULL;
  	unsigned int query_timeout;
  	struct cfg_context *nzctx;
  
  	REQUIRE(DNS_VIEW_VALID(view));
  
  	if (config != NULL)
  		(void)cfg_map_get(config, "options", &options);
  
  	/*
  	 * maps: view options, options, defaults
  	 * cfgmaps: view options, config
  	 * optionmaps: view options, options
  	 */
  	if (vconfig != NULL) {
  		voptions = cfg_tuple_get(vconfig, "options");
  		maps[i++] = voptions;
  		optionmaps[j++] = voptions;
  		cfgmaps[k++] = voptions;
  	}
  	if (options != NULL) {
  		maps[i++] = options;
  		optionmaps[j++] = options;
  	}
  
  	maps[i++] = ns_g_defaults;
  	maps[i] = NULL;
  	optionmaps[j] = NULL;
  	if (config != NULL)
  		cfgmaps[k++] = config;
  	cfgmaps[k] = NULL;
  
  	if (!strcmp(viewname, "_default")) {
  		sep = "";
  		viewname = "";
  		forview = "";
  		POST(forview);
  	}
  
  	/*
  	 * Set the view's port number for outgoing queries.
  	 */
  	CHECKM(ns_config_getport(config, &port), "port");
  	dns_view_setdstport(view, port);
  
  	/*
  	 * Create additional cache for this view and zones under the view
  	 * if explicitly enabled.
  	 * XXX950 default to on.
  	 */
  	obj = NULL;
  	(void)ns_config_get(maps, "acache-enable", &obj);
  	if (obj != NULL && cfg_obj_asboolean(obj)) {
  		cmctx = NULL;
  		CHECK(isc_mem_create(0, 0, &cmctx));
  		CHECK(dns_acache_create(&view->acache, cmctx, ns_g_taskmgr,
  					ns_g_timermgr));
  		isc_mem_setname(cmctx, "acache", NULL);
  		isc_mem_detach(&cmctx);
  	}
  	if (view->acache != NULL) {
  		obj = NULL;
  		result = ns_config_get(maps, "acache-cleaning-interval", &obj);
  		INSIST(result == ISC_R_SUCCESS);
  		dns_acache_setcleaninginterval(view->acache,
  					       cfg_obj_asuint32(obj) * 60);
  
  		obj = NULL;
  		result = ns_config_get(maps, "max-acache-size", &obj);
  		INSIST(result == ISC_R_SUCCESS);
  		if (cfg_obj_isstring(obj)) {
  			str = cfg_obj_asstring(obj);
  			INSIST(strcasecmp(str, "unlimited") == 0);
  			max_acache_size = ISC_UINT32_MAX;
  		} else {
  			isc_resourcevalue_t value;
  
  			value = cfg_obj_asuint64(obj);
  			if (value > ISC_UINT32_MAX) {
  				cfg_obj_log(obj, ns_g_lctx, ISC_LOG_ERROR,
  					    "'max-acache-size "
  					    "%" ISC_PRINT_QUADFORMAT
  					    "d' is too large",
  					    value);
  				result = ISC_R_RANGE;
  				goto cleanup;
  			}
  			max_acache_size = (isc_uint32_t)value;
  		}
  		dns_acache_setcachesize(view->acache, max_acache_size);
  	}
  
  	CHECK(configure_view_acl(vconfig, config, "allow-query", NULL, actx,
  				 ns_g_mctx, &view->queryacl));
  	if (view->queryacl == NULL) {
  		CHECK(configure_view_acl(NULL, ns_g_config, "allow-query",
  					 NULL, actx, ns_g_mctx,
  					 &view->queryacl));
  	}
  
  	/*
  	 * Configure the zones.
  	 */
  	zonelist = NULL;
  	if (voptions != NULL)
  		(void)cfg_map_get(voptions, "zone", &zonelist);
  	else
  		(void)cfg_map_get(config, "zone", &zonelist);
  
  	/*
  	 * Load zone configuration
  	 */
  	for (element = cfg_list_first(zonelist);
  	     element != NULL;
  	     element = cfg_list_next(element))
  	{
  		const cfg_obj_t *zconfig = cfg_listelt_value(element);
  		CHECK(configure_zone(config, zconfig, vconfig, mctx, view,
  				     actx, ISC_FALSE));
  	}
  
  	/*
  	 * If we're allowing added zones, then load zone configuration
  	 * from the newzone file for zones that were added during previous
  	 * runs.
  	 */
  	nzctx = view->new_zone_config;
  	if (nzctx != NULL && nzctx->nzconfig != NULL) {
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "loading additional zones for view '%s'",
  			      view->name);
  
  		zonelist = NULL;
  		cfg_map_get(nzctx->nzconfig, "zone", &zonelist);
  
  		for (element = cfg_list_first(zonelist);
  		     element != NULL;
  		     element = cfg_list_next(element))
  		{
  			const cfg_obj_t *zconfig = cfg_listelt_value(element);
  			CHECK(configure_zone(config, zconfig, vconfig,
  					     mctx, view, actx,
  					     ISC_TRUE));
  		}
  	}
  
  	/*
  	 * Create Dynamically Loadable Zone driver.
  	 */
  	dlz = NULL;
  	if (voptions != NULL)
  		(void)cfg_map_get(voptions, "dlz", &dlz);
  	else
  		(void)cfg_map_get(config, "dlz", &dlz);
  
  	obj = NULL;
  	if (dlz != NULL) {
  		(void)cfg_map_get(cfg_tuple_get(dlz, "options"),
  				  "database", &obj);
  		if (obj != NULL) {
  			char *s = isc_mem_strdup(mctx, cfg_obj_asstring(obj));
  			if (s == NULL) {
  				result = ISC_R_NOMEMORY;
  				goto cleanup;
  			}
  
  			result = dns_dlzstrtoargv(mctx, s, &dlzargc, &dlzargv);
  			if (result != ISC_R_SUCCESS) {
  				isc_mem_free(mctx, s);
  				goto cleanup;
  			}
  
  			obj = cfg_tuple_get(dlz, "name");
  			result = dns_dlzcreate(mctx, cfg_obj_asstring(obj),
  					       dlzargv[0], dlzargc, dlzargv,
  					       &view->dlzdatabase);
  			isc_mem_free(mctx, s);
  			isc_mem_put(mctx, dlzargv, dlzargc * sizeof(*dlzargv));
  			if (result != ISC_R_SUCCESS)
  				goto cleanup;
  
  			/*
  			 * If the dlz backend supports configuration,
  			 * then call its configure method now.
  			 */
  			result = dns_dlzconfigure(view, dlzconfigure_callback);
  			if (result != ISC_R_SUCCESS)
  				goto cleanup;
  		}
  	}
  
  	/*
  	 * Obtain configuration parameters that affect the decision of whether
  	 * we can reuse/share an existing cache.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "cleaning-interval", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	cleaning_interval = cfg_obj_asuint32(obj) * 60;
  
  	obj = NULL;
  	result = ns_config_get(maps, "max-cache-size", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	if (cfg_obj_isstring(obj)) {
  		str = cfg_obj_asstring(obj);
  		INSIST(strcasecmp(str, "unlimited") == 0);
  		max_cache_size = ISC_UINT32_MAX;
  	} else {
  		isc_resourcevalue_t value;
  		value = cfg_obj_asuint64(obj);
  		if (value > ISC_UINT32_MAX) {
  			cfg_obj_log(obj, ns_g_lctx, ISC_LOG_ERROR,
  				    "'max-cache-size "
  				    "%" ISC_PRINT_QUADFORMAT "d' is too large",
  				    value);
  			result = ISC_R_RANGE;
  			goto cleanup;
  		}
  		max_cache_size = (isc_uint32_t)value;
  	}
  
  	/* Check-names. */
  	obj = NULL;
  	result = ns_checknames_get(maps, "response", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  
  	str = cfg_obj_asstring(obj);
  	if (strcasecmp(str, "fail") == 0) {
  		resopts |= DNS_RESOLVER_CHECKNAMES |
  			DNS_RESOLVER_CHECKNAMESFAIL;
  		view->checknames = ISC_TRUE;
  	} else if (strcasecmp(str, "warn") == 0) {
  		resopts |= DNS_RESOLVER_CHECKNAMES;
  		view->checknames = ISC_FALSE;
  	} else if (strcasecmp(str, "ignore") == 0) {
  		view->checknames = ISC_FALSE;
  	} else
  		INSIST(0);
  
  	obj = NULL;
  	result = ns_config_get(maps, "zero-no-soa-ttl-cache", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	zero_no_soattl = cfg_obj_asboolean(obj);
  
  	obj = NULL;
  	result = ns_config_get(maps, "dns64", &obj);
  	if (result == ISC_R_SUCCESS && strcmp(view->name, "_bind") &&
  	    strcmp(view->name, "_meta")) {
  		const cfg_listelt_t *element;
  		isc_netaddr_t na, suffix, *sp;
  		unsigned int prefixlen;
  		const char *server, *contact;
  		const cfg_obj_t *myobj;
  
  		myobj = NULL;
  		result = ns_config_get(maps, "dns64-server", &myobj);
  		if (result == ISC_R_SUCCESS)
  			server = cfg_obj_asstring(myobj);
  		else
  			server = NULL;
  
  		myobj = NULL;
  		result = ns_config_get(maps, "dns64-contact", &myobj);
  		if (result == ISC_R_SUCCESS)
  			contact = cfg_obj_asstring(myobj);
  		else
  			contact = NULL;
  
  		for (element = cfg_list_first(obj);
  		     element != NULL;
  		     element = cfg_list_next(element))
  		{
  			const cfg_obj_t *map = cfg_listelt_value(element);
  			dns_dns64_t *dns64 = NULL;
  			unsigned int dns64options = 0;
  
  			cfg_obj_asnetprefix(cfg_map_getname(map), &na,
  					    &prefixlen);
  
  			obj = NULL;
  			(void)cfg_map_get(map, "suffix", &obj);
  			if (obj != NULL) {
  				sp = &suffix;
  				isc_netaddr_fromsockaddr(sp,
  						      cfg_obj_assockaddr(obj));
  			} else
  				sp = NULL;
  
  			clients = mapped = excluded = NULL;
  			obj = NULL;
  			(void)cfg_map_get(map, "clients", &obj);
  			if (obj != NULL) {
  				result = cfg_acl_fromconfig(obj, config,
  							    ns_g_lctx, actx,
  							    mctx, 0, &clients);
  				if (result != ISC_R_SUCCESS)
  					goto cleanup;
  			}
  			obj = NULL;
  			(void)cfg_map_get(map, "mapped", &obj);
  			if (obj != NULL) {
  				result = cfg_acl_fromconfig(obj, config,
  							    ns_g_lctx, actx,
  							    mctx, 0, &mapped);
  				if (result != ISC_R_SUCCESS)
  					goto cleanup;
  			}
  			obj = NULL;
  			(void)cfg_map_get(map, "exclude", &obj);
  			if (obj != NULL) {
  				result = cfg_acl_fromconfig(obj, config,
  							    ns_g_lctx, actx,
  							    mctx, 0, &excluded);
  				if (result != ISC_R_SUCCESS)
  					goto cleanup;
  			}
  
  			obj = NULL;
  			(void)cfg_map_get(map, "recursive-only", &obj);
  			if (obj != NULL && cfg_obj_asboolean(obj))
  				dns64options |= DNS_DNS64_RECURSIVE_ONLY;
  
  			obj = NULL;
  			(void)cfg_map_get(map, "break-dnssec", &obj);
  			if (obj != NULL && cfg_obj_asboolean(obj))
  				dns64options |= DNS_DNS64_BREAK_DNSSEC;
  
  			result = dns_dns64_create(mctx, &na, prefixlen, sp,
  						  clients, mapped, excluded,
  						  dns64options, &dns64);
  			if (result != ISC_R_SUCCESS)
  				goto cleanup;
  			dns_dns64_append(&view->dns64, dns64);
  			view->dns64cnt++;
  			result = dns64_reverse(view, mctx, &na, prefixlen,
  					       server, contact);
  			if (result != ISC_R_SUCCESS)
  				goto cleanup;
  			if (clients != NULL)
  				dns_acl_detach(&clients);
  			if (mapped != NULL)
  				dns_acl_detach(&mapped);
  			if (excluded != NULL)
  				dns_acl_detach(&excluded);
  		}
  	}
  
  	obj = NULL;
  	result = ns_config_get(maps, "dnssec-accept-expired", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	view->acceptexpired = cfg_obj_asboolean(obj);
  
  	obj = NULL;
  	result = ns_config_get(maps, "dnssec-validation", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	if (cfg_obj_isboolean(obj)) {
  		view->enablevalidation = cfg_obj_asboolean(obj);
  	} else {
  		/* If dnssec-validation is not boolean, it must be "auto" */
  		view->enablevalidation = ISC_TRUE;
  		auto_root = ISC_TRUE;
  	}
  
  	obj = NULL;
  	result = ns_config_get(maps, "max-cache-ttl", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	view->maxcachettl = cfg_obj_asuint32(obj);
  
  	obj = NULL;
  	result = ns_config_get(maps, "max-ncache-ttl", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	view->maxncachettl = cfg_obj_asuint32(obj);
  	if (view->maxncachettl > 7 * 24 * 3600)
  		view->maxncachettl = 7 * 24 * 3600;
  
  	/*
  	 * Configure the view's cache.
  	 *
  	 * First, check to see if there are any attach-cache options.  If yes,
  	 * attempt to lookup an existing cache at attach it to the view.  If
  	 * there is not one, then try to reuse an existing cache if possible;
  	 * otherwise create a new cache.
  	 *
  	 * Note that the ADB is not preserved or shared in either case.
  	 *
  	 * When a matching view is found, the associated statistics are also
  	 * retrieved and reused.
  	 *
  	 * XXX Determining when it is safe to reuse or share a cache is tricky.
  	 * When the view's configuration changes, the cached data may become
  	 * invalid because it reflects our old view of the world.  We check
  	 * some of the configuration parameters that could invalidate the cache
  	 * or otherwise make it unsharable, but there are other configuration
  	 * options that should be checked.  For example, if a view uses a
  	 * forwarder, changes in the forwarder configuration may invalidate
  	 * the cache.  At the moment, it's the administrator's responsibility to
  	 * ensure these configuration options don't invalidate reusing/sharing.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "attach-cache", &obj);
  	if (result == ISC_R_SUCCESS)
  		cachename = cfg_obj_asstring(obj);
  	else
  		cachename = view->name;
  	cache = NULL;
  	nsc = cachelist_find(cachelist, cachename);
  	if (nsc != NULL) {
  		if (!cache_sharable(nsc->primaryview, view, zero_no_soattl,
  				    cleaning_interval, max_cache_size)) {
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  				      "views %s and %s can't share the cache "
  				      "due to configuration parameter mismatch",
  				      nsc->primaryview->name, view->name);
  			result = ISC_R_FAILURE;
  			goto cleanup;
  		}
  		dns_cache_attach(nsc->cache, &cache);
  		shared_cache = ISC_TRUE;
  	} else {
  		if (strcmp(cachename, view->name) == 0) {
  			result = dns_viewlist_find(&ns_g_server->viewlist,
  						   cachename, view->rdclass,
  						   &pview);
  			if (result != ISC_R_NOTFOUND && result != ISC_R_SUCCESS)
  				goto cleanup;
  			if (pview != NULL) {
  				if (!cache_reusable(pview, view,
  						    zero_no_soattl)) {
  					isc_log_write(ns_g_lctx,
  						      NS_LOGCATEGORY_GENERAL,
  						      NS_LOGMODULE_SERVER,
  						      ISC_LOG_DEBUG(1),
  						      "cache cannot be reused "
  						      "for view %s due to "
  						      "configuration parameter "
  						      "mismatch", view->name);
  				} else {
  					INSIST(pview->cache != NULL);
  					isc_log_write(ns_g_lctx,
  						      NS_LOGCATEGORY_GENERAL,
  						      NS_LOGMODULE_SERVER,
  						      ISC_LOG_DEBUG(3),
  						      "reusing existing cache");
  					reused_cache = ISC_TRUE;
  					dns_cache_attach(pview->cache, &cache);
  				}
  				dns_view_getresstats(pview, &resstats);
  				dns_view_getresquerystats(pview,
  							  &resquerystats);
  				dns_view_detach(&pview);
  			}
  		}
  		if (cache == NULL) {
  			/*
  			 * Create a cache with the desired name.  This normally
  			 * equals the view name, but may also be a forward
  			 * reference to a view that share the cache with this
  			 * view but is not yet configured.  If it is not the
  			 * view name but not a forward reference either, then it
  			 * is simply a named cache that is not shared.
  			 *
  			 * We use two separate memory contexts for the
  			 * cache, for the main cache memory and the heap
  			 * memory.
  			 */
  			CHECK(isc_mem_create(0, 0, &cmctx));
  			isc_mem_setname(cmctx, "cache", NULL);
  			CHECK(isc_mem_create(0, 0, &hmctx));
  			isc_mem_setname(hmctx, "cache_heap", NULL);
  			CHECK(dns_cache_create3(cmctx, hmctx, ns_g_taskmgr,
  						ns_g_timermgr, view->rdclass,
  						cachename, "rbt", 0, NULL,
  						&cache));
  			isc_mem_detach(&cmctx);
  			isc_mem_detach(&hmctx);
  		}
  		nsc = isc_mem_get(mctx, sizeof(*nsc));
  		if (nsc == NULL) {
  			result = ISC_R_NOMEMORY;
  			goto cleanup;
  		}
  		nsc->cache = NULL;
  		dns_cache_attach(cache, &nsc->cache);
  		nsc->primaryview = view;
  		nsc->needflush = ISC_FALSE;
  		nsc->adbsizeadjusted = ISC_FALSE;
  		ISC_LINK_INIT(nsc, link);
  		ISC_LIST_APPEND(*cachelist, nsc, link);
  	}
  	dns_view_setcache2(view, cache, shared_cache);
  
  	/*
  	 * cache-file cannot be inherited if views are present, but this
  	 * should be caught by the configuration checking stage.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "cache-file", &obj);
  	if (result == ISC_R_SUCCESS && strcmp(view->name, "_bind") != 0) {
  		CHECK(dns_cache_setfilename(cache, cfg_obj_asstring(obj)));
  		if (!reused_cache && !shared_cache)
  			CHECK(dns_cache_load(cache));
  	}
  
  	dns_cache_setcleaninginterval(cache, cleaning_interval);
  	dns_cache_setcachesize(cache, max_cache_size);
  
  	dns_cache_detach(&cache);
  
  	/*
  	 * Resolver.
  	 *
  	 * XXXRTH  Hardwired number of tasks.
  	 */
  	CHECK(get_view_querysource_dispatch(maps, AF_INET, &dispatch4,
  					    ISC_TF(ISC_LIST_PREV(view, link)
  						   == NULL)));
  	CHECK(get_view_querysource_dispatch(maps, AF_INET6, &dispatch6,
  					    ISC_TF(ISC_LIST_PREV(view, link)
  						   == NULL)));
  	if (dispatch4 == NULL && dispatch6 == NULL) {
  		UNEXPECTED_ERROR(__FILE__, __LINE__,
  				 "unable to obtain neither an IPv4 nor"
  				 " an IPv6 dispatch");
  		result = ISC_R_UNEXPECTED;
  		goto cleanup;
  	}
  	CHECK(dns_view_createresolver(view, ns_g_taskmgr, 31,
  				      ns_g_socketmgr, ns_g_timermgr,
  				      resopts, ns_g_dispatchmgr,
  				      dispatch4, dispatch6));
  
  	if (resstats == NULL) {
  		CHECK(isc_stats_create(mctx, &resstats,
  				       dns_resstatscounter_max));
  	}
  	dns_view_setresstats(view, resstats);
  	if (resquerystats == NULL)
  		CHECK(dns_rdatatypestats_create(mctx, &resquerystats));
  	dns_view_setresquerystats(view, resquerystats);
  
  	/*
  	 * Set the ADB cache size to 1/8th of the max-cache-size or
  	 * MAX_ADB_SIZE_FOR_CACHESHARE when the cache is shared.
  	 */
  	max_adb_size = 0;
  	if (max_cache_size != 0) {
  		max_adb_size = max_cache_size / 8;
  		if (max_adb_size == 0)
  			max_adb_size = 1;	/* Force minimum. */
  		if (view != nsc->primaryview &&
  		    max_adb_size > MAX_ADB_SIZE_FOR_CACHESHARE) {
  			max_adb_size = MAX_ADB_SIZE_FOR_CACHESHARE;
  			if (!nsc->adbsizeadjusted) {
  				dns_adb_setadbsize(nsc->primaryview->adb,
  						   MAX_ADB_SIZE_FOR_CACHESHARE);
  				nsc->adbsizeadjusted = ISC_TRUE;
  			}
  		}
  	}
  	dns_adb_setadbsize(view->adb, max_adb_size);
  
  	/*
  	 * Set resolver's lame-ttl.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "lame-ttl", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	lame_ttl = cfg_obj_asuint32(obj);
  	if (lame_ttl > 1800)
  		lame_ttl = 1800;
  	dns_resolver_setlamettl(view->resolver, lame_ttl);
  
  	/*
  	 * Set the resolver's query timeout.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "resolver-query-timeout", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	query_timeout = cfg_obj_asuint32(obj);
  	dns_resolver_settimeout(view->resolver, query_timeout);
  
  	/* Specify whether to use 0-TTL for negative response for SOA query */
  	dns_resolver_setzeronosoattl(view->resolver, zero_no_soattl);
  
  	/*
  	 * Set the resolver's EDNS UDP size.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "edns-udp-size", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	udpsize = cfg_obj_asuint32(obj);
  	if (udpsize < 512)
  		udpsize = 512;
  	if (udpsize > 4096)
  		udpsize = 4096;
  	dns_resolver_setudpsize(view->resolver, (isc_uint16_t)udpsize);
  
  	/*
  	 * Set the maximum UDP response size.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "max-udp-size", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	udpsize = cfg_obj_asuint32(obj);
  	if (udpsize < 512)
  		udpsize = 512;
  	if (udpsize > 4096)
  		udpsize = 4096;
  	view->maxudp = udpsize;
  
  	/*
  	 * Set the maximum rsa exponent bits.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "max-rsa-exponent-size", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	maxbits = cfg_obj_asuint32(obj);
  	if (maxbits != 0 && maxbits < 35)
  		maxbits = 35;
  	if (maxbits > 4096)
  		maxbits = 4096;
  	view->maxbits = maxbits;
  
  	/*
  	 * Set supported DNSSEC algorithms.
  	 */
  	dns_resolver_reset_algorithms(view->resolver);
  	disabled = NULL;
  	(void)ns_config_get(maps, "disable-algorithms", &disabled);
  	if (disabled != NULL) {
  		for (element = cfg_list_first(disabled);
  		     element != NULL;
  		     element = cfg_list_next(element))
  			CHECK(disable_algorithms(cfg_listelt_value(element),
  						 view->resolver));
  	}
  
  	/*
  	 * A global or view "forwarders" option, if present,
  	 * creates an entry for "." in the forwarding table.
  	 */
  	forwardtype = NULL;
  	forwarders = NULL;
  	(void)ns_config_get(maps, "forward", &forwardtype);
  	(void)ns_config_get(maps, "forwarders", &forwarders);
  	if (forwarders != NULL)
  		CHECK(configure_forward(config, view, dns_rootname,
  					forwarders, forwardtype));
  
  	/*
  	 * Dual Stack Servers.
  	 */
  	alternates = NULL;
  	(void)ns_config_get(maps, "dual-stack-servers", &alternates);
  	if (alternates != NULL)
  		CHECK(configure_alternates(config, view, alternates));
  
  	/*
  	 * We have default hints for class IN if we need them.
  	 */
  	if (view->rdclass == dns_rdataclass_in && view->hints == NULL)
  		dns_view_sethints(view, ns_g_server->in_roothints);
  
  	/*
  	 * If we still have no hints, this is a non-IN view with no
  	 * "hints zone" configured.  Issue a warning, except if this
  	 * is a root server.  Root servers never need to consult
  	 * their hints, so it's no point requiring users to configure
  	 * them.
  	 */
  	if (view->hints == NULL) {
  		dns_zone_t *rootzone = NULL;
  		(void)dns_view_findzone(view, dns_rootname, &rootzone);
  		if (rootzone != NULL) {
  			dns_zone_detach(&rootzone);
  			need_hints = ISC_FALSE;
  		}
  		if (need_hints)
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_WARNING,
  				      "no root hints for view '%s'",
  				      view->name);
  	}
  
  	/*
  	 * Configure the view's TSIG keys.
  	 */
  	CHECK(ns_tsigkeyring_fromconfig(config, vconfig, view->mctx, &ring));
  	if (ns_g_server->sessionkey != NULL) {
  		CHECK(dns_tsigkeyring_add(ring, ns_g_server->session_keyname,
  					  ns_g_server->sessionkey));
  	}
  	dns_view_setkeyring(view, ring);
  	dns_tsigkeyring_detach(&ring);
  
  	/*
  	 * See if we can re-use a dynamic key ring.
  	 */
  	result = dns_viewlist_find(&ns_g_server->viewlist, view->name,
  				   view->rdclass, &pview);
  	if (result != ISC_R_NOTFOUND && result != ISC_R_SUCCESS)
  		goto cleanup;
  	if (pview != NULL) {
  		dns_view_getdynamickeyring(pview, &ring);
  		if (ring != NULL)
  			dns_view_setdynamickeyring(view, ring);
  		dns_tsigkeyring_detach(&ring);
  		dns_view_detach(&pview);
  	} else
  		dns_view_restorekeyring(view);
  
  	/*
  	 * Configure the view's peer list.
  	 */
  	{
  		const cfg_obj_t *peers = NULL;
  		const cfg_listelt_t *element;
  		dns_peerlist_t *newpeers = NULL;
  
  		(void)ns_config_get(cfgmaps, "server", &peers);
  		CHECK(dns_peerlist_new(mctx, &newpeers));
  		for (element = cfg_list_first(peers);
  		     element != NULL;
  		     element = cfg_list_next(element))
  		{
  			const cfg_obj_t *cpeer = cfg_listelt_value(element);
  			dns_peer_t *peer;
  
  			CHECK(configure_peer(cpeer, mctx, &peer));
  			dns_peerlist_addpeer(newpeers, peer);
  			dns_peer_detach(&peer);
  		}
  		dns_peerlist_detach(&view->peers);
  		view->peers = newpeers; /* Transfer ownership. */
  	}
  
  	/*
  	 *	Configure the views rrset-order.
  	 */
  	{
  		const cfg_obj_t *rrsetorder = NULL;
  		const cfg_listelt_t *element;
  
  		(void)ns_config_get(maps, "rrset-order", &rrsetorder);
  		CHECK(dns_order_create(mctx, &order));
  		for (element = cfg_list_first(rrsetorder);
  		     element != NULL;
  		     element = cfg_list_next(element))
  		{
  			const cfg_obj_t *ent = cfg_listelt_value(element);
  
  			CHECK(configure_order(order, ent));
  		}
  		if (view->order != NULL)
  			dns_order_detach(&view->order);
  		dns_order_attach(order, &view->order);
  		dns_order_detach(&order);
  	}
  	/*
  	 * Copy the aclenv object.
  	 */
  	dns_aclenv_copy(&view->aclenv, &ns_g_server->aclenv);
  
  	/*
  	 * Configure the "match-clients" and "match-destinations" ACL.
  	 */
  	CHECK(configure_view_acl(vconfig, config, "match-clients", NULL, actx,
  				 ns_g_mctx, &view->matchclients));
  	CHECK(configure_view_acl(vconfig, config, "match-destinations", NULL,
  				 actx, ns_g_mctx, &view->matchdestinations));
  
  	/*
  	 * Configure the "match-recursive-only" option.
  	 */
  	obj = NULL;
  	(void)ns_config_get(maps, "match-recursive-only", &obj);
  	if (obj != NULL && cfg_obj_asboolean(obj))
  		view->matchrecursiveonly = ISC_TRUE;
  	else
  		view->matchrecursiveonly = ISC_FALSE;
  
  	/*
  	 * Configure other configurable data.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "recursion", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	view->recursion = cfg_obj_asboolean(obj);
  
  	obj = NULL;
  	result = ns_config_get(maps, "auth-nxdomain", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	view->auth_nxdomain = cfg_obj_asboolean(obj);
  
  	obj = NULL;
  	result = ns_config_get(maps, "minimal-responses", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	view->minimalresponses = cfg_obj_asboolean(obj);
  
  	obj = NULL;
  	result = ns_config_get(maps, "transfer-format", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	str = cfg_obj_asstring(obj);
  	if (strcasecmp(str, "many-answers") == 0)
  		view->transfer_format = dns_many_answers;
  	else if (strcasecmp(str, "one-answer") == 0)
  		view->transfer_format = dns_one_answer;
  	else
  		INSIST(0);
  
  	/*
  	 * Set sources where additional data and CNAME/DNAME
  	 * targets for authoritative answers may be found.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "additional-from-auth", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	view->additionalfromauth = cfg_obj_asboolean(obj);
  	if (view->recursion && ! view->additionalfromauth) {
  		cfg_obj_log(obj, ns_g_lctx, ISC_LOG_WARNING,
  			    "'additional-from-auth no' is only supported "
  			    "with 'recursion no'");
  		view->additionalfromauth = ISC_TRUE;
  	}
  
  	obj = NULL;
  	result = ns_config_get(maps, "additional-from-cache", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	view->additionalfromcache = cfg_obj_asboolean(obj);
  	if (view->recursion && ! view->additionalfromcache) {
  		cfg_obj_log(obj, ns_g_lctx, ISC_LOG_WARNING,
  			    "'additional-from-cache no' is only supported "
  			    "with 'recursion no'");
  		view->additionalfromcache = ISC_TRUE;
  	}
  
  	/*
  	 * Set "allow-query-cache", "allow-query-cache-on",
  	 * "allow-recursion", and "allow-recursion-on" acls if
  	 * configured in named.conf.
  	 */
  	CHECK(configure_view_acl(vconfig, config, "allow-query-cache", NULL,
  				 actx, ns_g_mctx, &view->cacheacl));
  	CHECK(configure_view_acl(vconfig, config, "allow-query-cache-on", NULL,
  				 actx, ns_g_mctx, &view->cacheonacl));
  	if (view->cacheonacl == NULL)
  		CHECK(configure_view_acl(NULL, ns_g_config,
  					 "allow-query-cache-on", NULL, actx,
  					 ns_g_mctx, &view->cacheonacl));
  	if (strcmp(view->name, "_bind") != 0) {
  		CHECK(configure_view_acl(vconfig, config, "allow-recursion",
  					 NULL, actx, ns_g_mctx,
  					 &view->recursionacl));
  		CHECK(configure_view_acl(vconfig, config, "allow-recursion-on",
  					 NULL, actx, ns_g_mctx,
  					 &view->recursiononacl));
  	}
  
  	/*
  	 * "allow-query-cache" inherits from "allow-recursion" if set,
  	 * otherwise from "allow-query" if set.
  	 * "allow-recursion" inherits from "allow-query-cache" if set,
  	 * otherwise from "allow-query" if set.
  	 */
  	if (view->cacheacl == NULL && view->recursionacl != NULL)
  		dns_acl_attach(view->recursionacl, &view->cacheacl);
  	/*
  	 * XXXEACH: This call to configure_view_acl() is redundant.  We
  	 * are leaving it as it is because we are making a minimal change
  	 * for a patch release.  In the future this should be changed to
  	 * dns_acl_attach(view->queryacl, &view->cacheacl).
  	 */
  	if (view->cacheacl == NULL && view->recursion)
  		CHECK(configure_view_acl(vconfig, config, "allow-query", NULL,
  					 actx, ns_g_mctx, &view->cacheacl));
  	if (view->recursion &&
  	    view->recursionacl == NULL && view->cacheacl != NULL)
  		dns_acl_attach(view->cacheacl, &view->recursionacl);
  
  	/*
  	 * Set default "allow-recursion", "allow-recursion-on" and
  	 * "allow-query-cache" acls.
  	 */
  	if (view->recursionacl == NULL && view->recursion)
  		CHECK(configure_view_acl(NULL, ns_g_config,
  					 "allow-recursion", NULL,
  					 actx, ns_g_mctx,
  					 &view->recursionacl));
  	if (view->recursiononacl == NULL && view->recursion)
  		CHECK(configure_view_acl(NULL, ns_g_config,
  					 "allow-recursion-on", NULL,
  					 actx, ns_g_mctx,
  					 &view->recursiononacl));
  	if (view->cacheacl == NULL) {
  		if (view->recursion)
  			CHECK(configure_view_acl(NULL, ns_g_config,
  						 "allow-query-cache", NULL,
  						 actx, ns_g_mctx,
  						 &view->cacheacl));
  		else
  			CHECK(dns_acl_none(mctx, &view->cacheacl));
  	}
  
  	/*
  	 * Filter setting on addresses in the answer section.
  	 */
  	CHECK(configure_view_acl(vconfig, config, "deny-answer-addresses",
  				 "acl", actx, ns_g_mctx, &view->denyansweracl));
  	CHECK(configure_view_nametable(vconfig, config, "deny-answer-addresses",
  				       "except-from", ns_g_mctx,
  				       &view->answeracl_exclude));
  
  	/*
  	 * Filter setting on names (CNAME/DNAME targets) in the answer section.
  	 */
  	CHECK(configure_view_nametable(vconfig, config, "deny-answer-aliases",
  				       "name", ns_g_mctx,
  				       &view->denyanswernames));
  	CHECK(configure_view_nametable(vconfig, config, "deny-answer-aliases",
  				       "except-from", ns_g_mctx,
  				       &view->answernames_exclude));
  
  	/*
  	 * Configure sortlist, if set
  	 */
  	CHECK(configure_view_sortlist(vconfig, config, actx, ns_g_mctx,
  				      &view->sortlist));
  
  	/*
  	 * Configure default allow-transfer, allow-notify, allow-update
  	 * and allow-update-forwarding ACLs, if set, so they can be
  	 * inherited by zones.
  	 */
  	if (view->notifyacl == NULL)
  		CHECK(configure_view_acl(NULL, ns_g_config,
  					 "allow-notify", NULL, actx,
  					 ns_g_mctx, &view->notifyacl));
  	if (view->transferacl == NULL)
  		CHECK(configure_view_acl(NULL, ns_g_config,
  					 "allow-transfer", NULL, actx,
  					 ns_g_mctx, &view->transferacl));
  	if (view->updateacl == NULL)
  		CHECK(configure_view_acl(NULL, ns_g_config,
  					 "allow-update", NULL, actx,
  					 ns_g_mctx, &view->updateacl));
  	if (view->upfwdacl == NULL)
  		CHECK(configure_view_acl(NULL, ns_g_config,
  					 "allow-update-forwarding", NULL, actx,
  					 ns_g_mctx, &view->upfwdacl));
  
  	obj = NULL;
  	result = ns_config_get(maps, "provide-ixfr", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	view->provideixfr = cfg_obj_asboolean(obj);
  
  	obj = NULL;
  	result = ns_config_get(maps, "request-nsid", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	view->requestnsid = cfg_obj_asboolean(obj);
  
  	obj = NULL;
  	result = ns_config_get(maps, "max-clients-per-query", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	max_clients_per_query = cfg_obj_asuint32(obj);
  
  	obj = NULL;
  	result = ns_config_get(maps, "clients-per-query", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	dns_resolver_setclientsperquery(view->resolver,
  					cfg_obj_asuint32(obj),
  					max_clients_per_query);
  
  #ifdef ALLOW_FILTER_AAAA_ON_V4
  	obj = NULL;
  	result = ns_config_get(maps, "filter-aaaa-on-v4", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	if (cfg_obj_isboolean(obj)) {
  		if (cfg_obj_asboolean(obj))
  			view->v4_aaaa = dns_v4_aaaa_filter;
  		else
  			view->v4_aaaa = dns_v4_aaaa_ok;
  	} else {
  		const char *v4_aaaastr = cfg_obj_asstring(obj);
  		if (strcasecmp(v4_aaaastr, "break-dnssec") == 0)
  			view->v4_aaaa = dns_v4_aaaa_break_dnssec;
  		else
  			INSIST(0);
  	}
  	CHECK(configure_view_acl(vconfig, config, "filter-aaaa", NULL,
  				 actx, ns_g_mctx, &view->v4_aaaa_acl));
  #endif
  
  	obj = NULL;
  	result = ns_config_get(maps, "dnssec-enable", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	view->enablednssec = cfg_obj_asboolean(obj);
  
  	obj = NULL;
  	result = ns_config_get(optionmaps, "dnssec-lookaside", &obj);
  	if (result == ISC_R_SUCCESS) {
  		/* If set to "auto", use the version from the defaults */
  		const cfg_obj_t *dlvobj;
  		const char *dom;
  		dlvobj = cfg_listelt_value(cfg_list_first(obj));
  		dom = cfg_obj_asstring(cfg_tuple_get(dlvobj, "domain"));
  		if (cfg_obj_isvoid(cfg_tuple_get(dlvobj, "trust-anchor"))) {
  			/* If "no", skip; if "auto", use global default */
  			if (!strcasecmp(dom, "no"))
  				result = ISC_R_NOTFOUND;
  			else if (!strcasecmp(dom, "auto")) {
  				auto_dlv = ISC_TRUE;
  				obj = NULL;
  				result = cfg_map_get(ns_g_defaults,
  						     "dnssec-lookaside", &obj);
  			}
  		}
  	}
  
  	if (result == ISC_R_SUCCESS) {
  		for (element = cfg_list_first(obj);
  		     element != NULL;
  		     element = cfg_list_next(element))
  		{
  			const char *str;
  			isc_buffer_t b;
  			dns_name_t *dlv;
  
  			obj = cfg_listelt_value(element);
  			str = cfg_obj_asstring(cfg_tuple_get(obj,
  							     "trust-anchor"));
  			isc_buffer_init(&b, str, strlen(str));
  			isc_buffer_add(&b, strlen(str));
  			dlv = dns_fixedname_name(&view->dlv_fixed);
  			CHECK(dns_name_fromtext(dlv, &b, dns_rootname,
  						DNS_NAME_DOWNCASE, NULL));
  			view->dlv = dns_fixedname_name(&view->dlv_fixed);
  		}
  	} else
  		view->dlv = NULL;
  
  	/*
  	 * For now, there is only one kind of trusted keys, the
  	 * "security roots".
  	 */
  	CHECK(configure_view_dnsseckeys(view, vconfig, config, bindkeys,
  					auto_dlv, auto_root, mctx));
  	dns_resolver_resetmustbesecure(view->resolver);
  	obj = NULL;
  	result = ns_config_get(maps, "dnssec-must-be-secure", &obj);
  	if (result == ISC_R_SUCCESS)
  		CHECK(mustbesecure(obj, view->resolver));
  
  	obj = NULL;
  	result = ns_config_get(maps, "preferred-glue", &obj);
  	if (result == ISC_R_SUCCESS) {
  		str = cfg_obj_asstring(obj);
  		if (strcasecmp(str, "a") == 0)
  			view->preferred_glue = dns_rdatatype_a;
  		else if (strcasecmp(str, "aaaa") == 0)
  			view->preferred_glue = dns_rdatatype_aaaa;
  		else
  			view->preferred_glue = 0;
  	} else
  		view->preferred_glue = 0;
  
  	obj = NULL;
  	result = ns_config_get(maps, "root-delegation-only", &obj);
  	if (result == ISC_R_SUCCESS) {
  		dns_view_setrootdelonly(view, ISC_TRUE);
  		if (!cfg_obj_isvoid(obj)) {
  			dns_fixedname_t fixed;
  			dns_name_t *name;
  			isc_buffer_t b;
  			const char *str;
  			const cfg_obj_t *exclude;
  
  			dns_fixedname_init(&fixed);
  			name = dns_fixedname_name(&fixed);
  			for (element = cfg_list_first(obj);
  			     element != NULL;
  			     element = cfg_list_next(element)) {
  				exclude = cfg_listelt_value(element);
  				str = cfg_obj_asstring(exclude);
  				isc_buffer_init(&b, str, strlen(str));
  				isc_buffer_add(&b, strlen(str));
  				CHECK(dns_name_fromtext(name, &b, dns_rootname,
  							0, NULL));
  				CHECK(dns_view_excludedelegationonly(view,
  								     name));
  			}
  		}
  	} else
  		dns_view_setrootdelonly(view, ISC_FALSE);
  
  	/*
  	 * Setup automatic empty zones.  If recursion is off then
  	 * they are disabled by default.
  	 */
  	obj = NULL;
  	(void)ns_config_get(maps, "empty-zones-enable", &obj);
  	(void)ns_config_get(maps, "disable-empty-zone", &disablelist);
  	if (obj == NULL && disablelist == NULL &&
  	    view->rdclass == dns_rdataclass_in) {
  		empty_zones_enable = view->recursion;
  	} else if (view->rdclass == dns_rdataclass_in) {
  		if (obj != NULL)
  			empty_zones_enable = cfg_obj_asboolean(obj);
  		else
  			empty_zones_enable = view->recursion;
  	} else {
  		empty_zones_enable = ISC_FALSE;
  	}
  	if (empty_zones_enable && !lwresd_g_useresolvconf) {
  		const char *empty;
  		int empty_zone = 0;
  		dns_fixedname_t fixed;
  		dns_name_t *name;
  		isc_buffer_t buffer;
  		const char *str;
  		char server[DNS_NAME_FORMATSIZE + 1];
  		char contact[DNS_NAME_FORMATSIZE + 1];
  		const char *empty_dbtype[4] =
  				    { "_builtin", "empty", NULL, NULL };
  		int empty_dbtypec = 4;
  		isc_boolean_t zonestats_on;
  
  		dns_fixedname_init(&fixed);
  		name = dns_fixedname_name(&fixed);
  
  		obj = NULL;
  		result = ns_config_get(maps, "empty-server", &obj);
  		if (result == ISC_R_SUCCESS) {
  			str = cfg_obj_asstring(obj);
  			isc_buffer_init(&buffer, str, strlen(str));
  			isc_buffer_add(&buffer, strlen(str));
  			CHECK(dns_name_fromtext(name, &buffer, dns_rootname, 0,
  						NULL));
  			isc_buffer_init(&buffer, server, sizeof(server) - 1);
  			CHECK(dns_name_totext(name, ISC_FALSE, &buffer));
  			server[isc_buffer_usedlength(&buffer)] = 0;
  			empty_dbtype[2] = server;
  		} else
  			empty_dbtype[2] = "@";
  
  		obj = NULL;
  		result = ns_config_get(maps, "empty-contact", &obj);
  		if (result == ISC_R_SUCCESS) {
  			str = cfg_obj_asstring(obj);
  			isc_buffer_init(&buffer, str, strlen(str));
  			isc_buffer_add(&buffer, strlen(str));
  			CHECK(dns_name_fromtext(name, &buffer, dns_rootname, 0,
  						NULL));
  			isc_buffer_init(&buffer, contact, sizeof(contact) - 1);
  			CHECK(dns_name_totext(name, ISC_FALSE, &buffer));
  			contact[isc_buffer_usedlength(&buffer)] = 0;
  			empty_dbtype[3] = contact;
  		} else
  			empty_dbtype[3] = ".";
  
  		obj = NULL;
  		result = ns_config_get(maps, "zone-statistics", &obj);
  		INSIST(result == ISC_R_SUCCESS);
  		zonestats_on = cfg_obj_asboolean(obj);
  
  		for (empty = empty_zones[empty_zone];
  		     empty != NULL;
  		     empty = empty_zones[++empty_zone])
  		{
  			dns_forwarders_t *forwarders = NULL;
  			dns_view_t *pview = NULL;
  
  			isc_buffer_init(&buffer, empty, strlen(empty));
  			isc_buffer_add(&buffer, strlen(empty));
  			/*
  			 * Look for zone on drop list.
  			 */
  			CHECK(dns_name_fromtext(name, &buffer, dns_rootname, 0,
  						NULL));
  			if (disablelist != NULL &&
  			    on_disable_list(disablelist, name))
  				continue;
  
  			/*
  			 * This zone already exists.
  			 */
  			(void)dns_view_findzone(view, name, &zone);
  			if (zone != NULL) {
  				CHECK(setquerystats(zone, mctx, zonestats_on));
  				dns_zone_detach(&zone);
  				continue;
  			}
  
  			/*
  			 * If we would forward this name don't add a
  			 * empty zone for it.
  			 */
  			result = dns_fwdtable_find(view->fwdtable, name,
  						   &forwarders);
  			if (result == ISC_R_SUCCESS &&
  			    forwarders->fwdpolicy == dns_fwdpolicy_only)
  				continue;
  
  			/*
  			 * See if we can re-use a existing zone.
  			 */
  			result = dns_viewlist_find(&ns_g_server->viewlist,
  						   view->name, view->rdclass,
  						   &pview);
  			if (result != ISC_R_NOTFOUND &&
  			    result != ISC_R_SUCCESS)
  				goto cleanup;
  
  			if (pview != NULL) {
  				(void)dns_view_findzone(pview, name, &zone);
  				dns_view_detach(&pview);
  				if (zone != NULL)
  					check_dbtype(&zone, empty_dbtypec,
  						     empty_dbtype, mctx);
  				if (zone != NULL) {
  					dns_zone_setview(zone, view);
  					CHECK(dns_view_addzone(view, zone));
  					CHECK(setquerystats(zone, mctx,
  							    zonestats_on));
  					dns_zone_detach(&zone);
  					continue;
  				}
  			}
  
  			CHECK(dns_zone_create(&zone, mctx));
  			CHECK(dns_zone_setorigin(zone, name));
  			dns_zone_setview(zone, view);
  			CHECK(dns_zonemgr_managezone(ns_g_server->zonemgr,
  						     zone));
  			dns_zone_setclass(zone, view->rdclass);
  			dns_zone_settype(zone, dns_zone_master);
  			dns_zone_setstats(zone, ns_g_server->zonestats);
  			CHECK(dns_zone_setdbtype(zone, empty_dbtypec,
  						 empty_dbtype));
  			if (view->queryacl != NULL)
  				dns_zone_setqueryacl(zone, view->queryacl);
  			if (view->queryonacl != NULL)
  				dns_zone_setqueryonacl(zone, view->queryonacl);
  			dns_zone_setdialup(zone, dns_dialuptype_no);
  			dns_zone_setnotifytype(zone, dns_notifytype_no);
  			dns_zone_setoption(zone, DNS_ZONEOPT_NOCHECKNS,
  					   ISC_TRUE);
  			CHECK(setquerystats(zone, mctx, zonestats_on));
  			CHECK(dns_view_addzone(view, zone));
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  				      "automatic empty zone%s%s: %s",
  				      sep, viewname,  empty);
  			dns_zone_detach(&zone);
  		}
  	}
  
  	/*
  	 * Make the list of response policy zone names for views that
  	 * are used for real lookups and so care about hints.
  	 */
  	obj = NULL;
  	if (view->rdclass == dns_rdataclass_in && need_hints &&
  	    ns_config_get(maps, "response-policy", &obj) == ISC_R_SUCCESS) {
  		const cfg_obj_t *recursive_only_obj;
  		const cfg_obj_t *break_dnssec_obj, *ttl_obj;
  		isc_boolean_t recursive_only_def;
  		dns_ttl_t ttl_def;
  
  		recursive_only_obj = cfg_tuple_get(obj, "recursive-only");
  		if (!cfg_obj_isvoid(recursive_only_obj) &&
  		    !cfg_obj_asboolean(recursive_only_obj))
  			recursive_only_def = ISC_FALSE;
  		else
  			recursive_only_def = ISC_TRUE;
  
  		break_dnssec_obj = cfg_tuple_get(obj, "break-dnssec");
  		if (!cfg_obj_isvoid(break_dnssec_obj) &&
  		    cfg_obj_asboolean(break_dnssec_obj))
  			view->rpz_break_dnssec = ISC_TRUE;
  		else
  			view->rpz_break_dnssec = ISC_FALSE;
  
  		ttl_obj = cfg_tuple_get(obj, "max-policy-ttl");
  		if (cfg_obj_isuint32(ttl_obj))
  			ttl_def = cfg_obj_asuint32(ttl_obj);
  		else
  			ttl_def = DNS_RPZ_MAX_TTL_DEFAULT;
  
  		for (element = cfg_list_first(cfg_tuple_get(obj, "zone list"));
  		     element != NULL;
  		     element = cfg_list_next(element)) {
  			result = configure_rpz(view, element,
  					       recursive_only_def, ttl_def);
  			if (result != ISC_R_SUCCESS)
  				goto cleanup;
  			dns_rpz_set_need(ISC_TRUE);
  		}
  	}
  
  	obj = NULL;
  	result = ns_config_get(maps, "rate-limit", &obj);
  	if (result == ISC_R_SUCCESS) {
  		result = configure_rrl(view, config, obj);
  		if (result != ISC_R_SUCCESS)
  			goto cleanup;
  	}
  
  	result = ISC_R_SUCCESS;
  
   cleanup:
  	if (clients != NULL)
  		dns_acl_detach(&clients);
  	if (mapped != NULL)
  		dns_acl_detach(&mapped);
  	if (excluded != NULL)
  		dns_acl_detach(&excluded);
  	if (ring != NULL)
  		dns_tsigkeyring_detach(&ring);
  	if (zone != NULL)
  		dns_zone_detach(&zone);
  	if (dispatch4 != NULL)
  		dns_dispatch_detach(&dispatch4);
  	if (dispatch6 != NULL)
  		dns_dispatch_detach(&dispatch6);
  	if (resstats != NULL)
  		isc_stats_detach(&resstats);
  	if (resquerystats != NULL)
  		dns_stats_detach(&resquerystats);
  	if (order != NULL)
  		dns_order_detach(&order);
  	if (cmctx != NULL)
  		isc_mem_detach(&cmctx);
  	if (hmctx != NULL)
  		isc_mem_detach(&hmctx);
  
  	if (cache != NULL)
  		dns_cache_detach(&cache);
  
  	return (result);
  }
  
  static isc_result_t
  configure_hints(dns_view_t *view, const char *filename) {
  	isc_result_t result;
  	dns_db_t *db;
  
  	db = NULL;
  	result = dns_rootns_create(view->mctx, view->rdclass, filename, &db);
  	if (result == ISC_R_SUCCESS) {
  		dns_view_sethints(view, db);
  		dns_db_detach(&db);
  	}
  
  	return (result);
  }
  
  static isc_result_t
  configure_alternates(const cfg_obj_t *config, dns_view_t *view,
  		     const cfg_obj_t *alternates)
  {
  	const cfg_obj_t *portobj;
  	const cfg_obj_t *addresses;
  	const cfg_listelt_t *element;
  	isc_result_t result = ISC_R_SUCCESS;
  	in_port_t port;
  
  	/*
  	 * Determine which port to send requests to.
  	 */
  	if (ns_g_lwresdonly && ns_g_port != 0)
  		port = ns_g_port;
  	else
  		CHECKM(ns_config_getport(config, &port), "port");
  
  	if (alternates != NULL) {
  		portobj = cfg_tuple_get(alternates, "port");
  		if (cfg_obj_isuint32(portobj)) {
  			isc_uint32_t val = cfg_obj_asuint32(portobj);
  			if (val > ISC_UINT16_MAX) {
  				cfg_obj_log(portobj, ns_g_lctx, ISC_LOG_ERROR,
  					    "port '%u' out of range", val);
  				return (ISC_R_RANGE);
  			}
  			port = (in_port_t) val;
  		}
  	}
  
  	addresses = NULL;
  	if (alternates != NULL)
  		addresses = cfg_tuple_get(alternates, "addresses");
  
  	for (element = cfg_list_first(addresses);
  	     element != NULL;
  	     element = cfg_list_next(element))
  	{
  		const cfg_obj_t *alternate = cfg_listelt_value(element);
  		isc_sockaddr_t sa;
  
  		if (!cfg_obj_issockaddr(alternate)) {
  			dns_fixedname_t fixed;
  			dns_name_t *name;
  			const char *str = cfg_obj_asstring(cfg_tuple_get(
  							   alternate, "name"));
  			isc_buffer_t buffer;
  			in_port_t myport = port;
  
  			isc_buffer_init(&buffer, str, strlen(str));
  			isc_buffer_add(&buffer, strlen(str));
  			dns_fixedname_init(&fixed);
  			name = dns_fixedname_name(&fixed);
  			CHECK(dns_name_fromtext(name, &buffer, dns_rootname, 0,
  						NULL));
  
  			portobj = cfg_tuple_get(alternate, "port");
  			if (cfg_obj_isuint32(portobj)) {
  				isc_uint32_t val = cfg_obj_asuint32(portobj);
  				if (val > ISC_UINT16_MAX) {
  					cfg_obj_log(portobj, ns_g_lctx,
  						    ISC_LOG_ERROR,
  						    "port '%u' out of range",
  						     val);
  					return (ISC_R_RANGE);
  				}
  				myport = (in_port_t) val;
  			}
  			CHECK(dns_resolver_addalternate(view->resolver, NULL,
  							name, myport));
  			continue;
  		}
  
  		sa = *cfg_obj_assockaddr(alternate);
  		if (isc_sockaddr_getport(&sa) == 0)
  			isc_sockaddr_setport(&sa, port);
  		CHECK(dns_resolver_addalternate(view->resolver, &sa,
  						NULL, 0));
  	}
  
   cleanup:
  	return (result);
  }
  
  static isc_result_t
  configure_forward(const cfg_obj_t *config, dns_view_t *view, dns_name_t *origin,
  		  const cfg_obj_t *forwarders, const cfg_obj_t *forwardtype)
  {
  	const cfg_obj_t *portobj;
  	const cfg_obj_t *faddresses;
  	const cfg_listelt_t *element;
  	dns_fwdpolicy_t fwdpolicy = dns_fwdpolicy_none;
  	isc_sockaddrlist_t addresses;
  	isc_sockaddr_t *sa;
  	isc_result_t result;
  	in_port_t port;
  
  	ISC_LIST_INIT(addresses);
  
  	/*
  	 * Determine which port to send forwarded requests to.
  	 */
  	if (ns_g_lwresdonly && ns_g_port != 0)
  		port = ns_g_port;
  	else
  		CHECKM(ns_config_getport(config, &port), "port");
  
  	if (forwarders != NULL) {
  		portobj = cfg_tuple_get(forwarders, "port");
  		if (cfg_obj_isuint32(portobj)) {
  			isc_uint32_t val = cfg_obj_asuint32(portobj);
  			if (val > ISC_UINT16_MAX) {
  				cfg_obj_log(portobj, ns_g_lctx, ISC_LOG_ERROR,
  					    "port '%u' out of range", val);
  				return (ISC_R_RANGE);
  			}
  			port = (in_port_t) val;
  		}
  	}
  
  	faddresses = NULL;
  	if (forwarders != NULL)
  		faddresses = cfg_tuple_get(forwarders, "addresses");
  
  	for (element = cfg_list_first(faddresses);
  	     element != NULL;
  	     element = cfg_list_next(element))
  	{
  		const cfg_obj_t *forwarder = cfg_listelt_value(element);
  		sa = isc_mem_get(view->mctx, sizeof(isc_sockaddr_t));
  		if (sa == NULL) {
  			result = ISC_R_NOMEMORY;
  			goto cleanup;
  		}
  		*sa = *cfg_obj_assockaddr(forwarder);
  		if (isc_sockaddr_getport(sa) == 0)
  			isc_sockaddr_setport(sa, port);
  		ISC_LINK_INIT(sa, link);
  		ISC_LIST_APPEND(addresses, sa, link);
  	}
  
  	if (ISC_LIST_EMPTY(addresses)) {
  		if (forwardtype != NULL)
  			cfg_obj_log(forwarders, ns_g_lctx, ISC_LOG_WARNING,
  				    "no forwarders seen; disabling "
  				    "forwarding");
  		fwdpolicy = dns_fwdpolicy_none;
  	} else {
  		if (forwardtype == NULL)
  			fwdpolicy = dns_fwdpolicy_first;
  		else {
  			const char *forwardstr = cfg_obj_asstring(forwardtype);
  			if (strcasecmp(forwardstr, "first") == 0)
  				fwdpolicy = dns_fwdpolicy_first;
  			else if (strcasecmp(forwardstr, "only") == 0)
  				fwdpolicy = dns_fwdpolicy_only;
  			else
  				INSIST(0);
  		}
  	}
  
  	result = dns_fwdtable_add(view->fwdtable, origin, &addresses,
  				  fwdpolicy);
  	if (result != ISC_R_SUCCESS) {
  		char namebuf[DNS_NAME_FORMATSIZE];
  		dns_name_format(origin, namebuf, sizeof(namebuf));
  		cfg_obj_log(forwarders, ns_g_lctx, ISC_LOG_WARNING,
  			    "could not set up forwarding for domain '%s': %s",
  			    namebuf, isc_result_totext(result));
  		goto cleanup;
  	}
  
  	result = ISC_R_SUCCESS;
  
   cleanup:
  
  	while (!ISC_LIST_EMPTY(addresses)) {
  		sa = ISC_LIST_HEAD(addresses);
  		ISC_LIST_UNLINK(addresses, sa, link);
  		isc_mem_put(view->mctx, sa, sizeof(isc_sockaddr_t));
  	}
  
  	return (result);
  }
  
  static isc_result_t
  get_viewinfo(const cfg_obj_t *vconfig, const char **namep,
  	     dns_rdataclass_t *classp)
  {
  	isc_result_t result = ISC_R_SUCCESS;
  	const char *viewname;
  	dns_rdataclass_t viewclass;
  
  	REQUIRE(namep != NULL && *namep == NULL);
  	REQUIRE(classp != NULL);
  
  	if (vconfig != NULL) {
  		const cfg_obj_t *classobj = NULL;
  
  		viewname = cfg_obj_asstring(cfg_tuple_get(vconfig, "name"));
  		classobj = cfg_tuple_get(vconfig, "class");
  		result = ns_config_getclass(classobj, dns_rdataclass_in,
  					    &viewclass);
  	} else {
  		viewname = "_default";
  		viewclass = dns_rdataclass_in;
  	}
  
  	*namep = viewname;
  	*classp = viewclass;
  
  	return (result);
  }
  
  /*
   * Find a view based on its configuration info and attach to it.
   *
   * If 'vconfig' is NULL, attach to the default view.
   */
  static isc_result_t
  find_view(const cfg_obj_t *vconfig, dns_viewlist_t *viewlist,
  	  dns_view_t **viewp)
  {
  	isc_result_t result;
  	const char *viewname = NULL;
  	dns_rdataclass_t viewclass;
  	dns_view_t *view = NULL;
  
  	result = get_viewinfo(vconfig, &viewname, &viewclass);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	result = dns_viewlist_find(viewlist, viewname, viewclass, &view);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	*viewp = view;
  	return (ISC_R_SUCCESS);
  }
  
  /*
   * Create a new view and add it to the list.
   *
   * If 'vconfig' is NULL, create the default view.
   *
   * The view created is attached to '*viewp'.
   */
  static isc_result_t
  create_view(const cfg_obj_t *vconfig, dns_viewlist_t *viewlist,
  	    dns_view_t **viewp)
  {
  	isc_result_t result;
  	const char *viewname = NULL;
  	dns_rdataclass_t viewclass;
  	dns_view_t *view = NULL;
  
  	result = get_viewinfo(vconfig, &viewname, &viewclass);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	result = dns_viewlist_find(viewlist, viewname, viewclass, &view);
  	if (result == ISC_R_SUCCESS)
  		return (ISC_R_EXISTS);
  	if (result != ISC_R_NOTFOUND)
  		return (result);
  	INSIST(view == NULL);
  
  	result = dns_view_create(ns_g_mctx, viewclass, viewname, &view);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	ISC_LIST_APPEND(*viewlist, view, link);
  	dns_view_attach(view, viewp);
  	return (ISC_R_SUCCESS);
  }
  
  /*
   * Configure or reconfigure a zone.
   */
  static isc_result_t
  configure_zone(const cfg_obj_t *config, const cfg_obj_t *zconfig,
  	       const cfg_obj_t *vconfig, isc_mem_t *mctx, dns_view_t *view,
  	       cfg_aclconfctx_t *aclconf, isc_boolean_t added)
  {
  	dns_view_t *pview = NULL;	/* Production view */
  	dns_zone_t *zone = NULL;	/* New or reused zone */
  	dns_zone_t *raw = NULL;		/* New or reused raw zone */
  	dns_zone_t *dupzone = NULL;
  	const cfg_obj_t *options = NULL;
  	const cfg_obj_t *zoptions = NULL;
  	const cfg_obj_t *typeobj = NULL;
  	const cfg_obj_t *forwarders = NULL;
  	const cfg_obj_t *forwardtype = NULL;
  	const cfg_obj_t *only = NULL;
  	const cfg_obj_t *signing = NULL;
  	isc_result_t result;
  	isc_result_t tresult;
  	isc_buffer_t buffer;
  	dns_fixedname_t fixorigin;
  	dns_name_t *origin;
  	const char *zname;
  	dns_rdataclass_t zclass;
  	const char *ztypestr;
  
  	options = NULL;
  	(void)cfg_map_get(config, "options", &options);
  
  	zoptions = cfg_tuple_get(zconfig, "options");
  
  	/*
  	 * Get the zone origin as a dns_name_t.
  	 */
  	zname = cfg_obj_asstring(cfg_tuple_get(zconfig, "name"));
  	isc_buffer_init(&buffer, zname, strlen(zname));
  	isc_buffer_add(&buffer, strlen(zname));
  	dns_fixedname_init(&fixorigin);
  	CHECK(dns_name_fromtext(dns_fixedname_name(&fixorigin),
  				&buffer, dns_rootname, 0, NULL));
  	origin = dns_fixedname_name(&fixorigin);
  
  	CHECK(ns_config_getclass(cfg_tuple_get(zconfig, "class"),
  				 view->rdclass, &zclass));
  	if (zclass != view->rdclass) {
  		const char *vname = NULL;
  		if (vconfig != NULL)
  			vname = cfg_obj_asstring(cfg_tuple_get(vconfig,
  							       "name"));
  		else
  			vname = "<default view>";
  
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  			      "zone '%s': wrong class for view '%s'",
  			      zname, vname);
  		result = ISC_R_FAILURE;
  		goto cleanup;
  	}
  
  	(void)cfg_map_get(zoptions, "type", &typeobj);
  	if (typeobj == NULL) {
  		cfg_obj_log(zconfig, ns_g_lctx, ISC_LOG_ERROR,
  			    "zone '%s' 'type' not specified", zname);
  		return (ISC_R_FAILURE);
  	}
  	ztypestr = cfg_obj_asstring(typeobj);
  
  	/*
  	 * "hints zones" aren't zones.	If we've got one,
  	 * configure it and return.
  	 */
  	if (strcasecmp(ztypestr, "hint") == 0) {
  		const cfg_obj_t *fileobj = NULL;
  		if (cfg_map_get(zoptions, "file", &fileobj) != ISC_R_SUCCESS) {
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  				      "zone '%s': 'file' not specified",
  				      zname);
  			result = ISC_R_FAILURE;
  			goto cleanup;
  		}
  		if (dns_name_equal(origin, dns_rootname)) {
  			const char *hintsfile = cfg_obj_asstring(fileobj);
  
  			result = configure_hints(view, hintsfile);
  			if (result != ISC_R_SUCCESS) {
  				isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  					      NS_LOGMODULE_SERVER,
  					      ISC_LOG_ERROR,
  					      "could not configure root hints "
  					      "from '%s': %s", hintsfile,
  					      isc_result_totext(result));
  				goto cleanup;
  			}
  			/*
  			 * Hint zones may also refer to delegation only points.
  			 */
  			only = NULL;
  			tresult = cfg_map_get(zoptions, "delegation-only",
  					      &only);
  			if (tresult == ISC_R_SUCCESS && cfg_obj_asboolean(only))
  				CHECK(dns_view_adddelegationonly(view, origin));
  		} else {
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_WARNING,
  				      "ignoring non-root hint zone '%s'",
  				      zname);
  			result = ISC_R_SUCCESS;
  		}
  		/* Skip ordinary zone processing. */
  		goto cleanup;
  	}
  
  	/*
  	 * "forward zones" aren't zones either.  Translate this syntax into
  	 * the appropriate selective forwarding configuration and return.
  	 */
  	if (strcasecmp(ztypestr, "forward") == 0) {
  		forwardtype = NULL;
  		forwarders = NULL;
  
  		(void)cfg_map_get(zoptions, "forward", &forwardtype);
  		(void)cfg_map_get(zoptions, "forwarders", &forwarders);
  		result = configure_forward(config, view, origin, forwarders,
  					   forwardtype);
  		goto cleanup;
  	}
  
  	/*
  	 * "delegation-only zones" aren't zones either.
  	 */
  	if (strcasecmp(ztypestr, "delegation-only") == 0) {
  		result = dns_view_adddelegationonly(view, origin);
  		goto cleanup;
  	}
  
  	/*
  	 * Redirect zones only require minimal configuration.
  	 */
  	if (strcasecmp(ztypestr, "redirect") == 0) {
  		if (view->redirect != NULL) {
  			cfg_obj_log(zconfig, ns_g_lctx, ISC_LOG_ERROR,
  				    "redirect zone already exists");
  			result = ISC_R_EXISTS;
  			goto cleanup;
  		}
  		result = dns_viewlist_find(&ns_g_server->viewlist, view->name,
  					   view->rdclass, &pview);
  		if (result != ISC_R_NOTFOUND && result != ISC_R_SUCCESS)
  			goto cleanup;
  		if (pview != NULL && pview->redirect != NULL) {
  			dns_zone_attach(pview->redirect, &zone);
  			dns_zone_setview(zone, view);
  		} else {
  			CHECK(dns_zone_create(&zone, mctx));
  			CHECK(dns_zone_setorigin(zone, origin));
  			dns_zone_setview(zone, view);
  			CHECK(dns_zonemgr_managezone(ns_g_server->zonemgr,
  						     zone));
  			dns_zone_setstats(zone, ns_g_server->zonestats);
  		}
  		CHECK(ns_zone_configure(config, vconfig, zconfig, aclconf,
  					zone, NULL));
  		dns_zone_attach(zone, &view->redirect);
  		goto cleanup;
  	}
  
  	/*
  	 * Check for duplicates in the new zone table.
  	 */
  	result = dns_view_findzone(view, origin, &dupzone);
  	if (result == ISC_R_SUCCESS) {
  		/*
  		 * We already have this zone!
  		 */
  		cfg_obj_log(zconfig, ns_g_lctx, ISC_LOG_ERROR,
  			    "zone '%s' already exists", zname);
  		dns_zone_detach(&dupzone);
  		result = ISC_R_EXISTS;
  		goto cleanup;
  	}
  	INSIST(dupzone == NULL);
  
  	/*
  	 * See if we can reuse an existing zone.  This is
  	 * only possible if all of these are true:
  	 *   - The zone's view exists
  	 *   - A zone with the right name exists in the view
  	 *   - The zone is compatible with the config
  	 *     options (e.g., an existing master zone cannot
  	 *     be reused if the options specify a slave zone)
  	 */
  	result = dns_viewlist_find(&ns_g_server->viewlist, view->name,
  				   view->rdclass, &pview);
  	if (result != ISC_R_NOTFOUND && result != ISC_R_SUCCESS)
  		goto cleanup;
  	if (pview != NULL)
  		result = dns_view_findzone(pview, origin, &zone);
  	if (result != ISC_R_NOTFOUND && result != ISC_R_SUCCESS)
  		goto cleanup;
  
  	if (zone != NULL && !ns_zone_reusable(zone, zconfig))
  		dns_zone_detach(&zone);
  
  	if (zone != NULL) {
  		/*
  		 * We found a reusable zone.  Make it use the
  		 * new view.
  		 */
  		dns_zone_setview(zone, view);
  		if (view->acache != NULL)
  			dns_zone_setacache(zone, view->acache);
  	} else {
  		/*
  		 * We cannot reuse an existing zone, we have
  		 * to create a new one.
  		 */
  		CHECK(dns_zone_create(&zone, mctx));
  		CHECK(dns_zone_setorigin(zone, origin));
  		dns_zone_setview(zone, view);
  		if (view->acache != NULL)
  			dns_zone_setacache(zone, view->acache);
  		CHECK(dns_zonemgr_managezone(ns_g_server->zonemgr, zone));
  		dns_zone_setstats(zone, ns_g_server->zonestats);
  	}
  
  	/*
  	 * If the zone contains a 'forwarders' statement, configure
  	 * selective forwarding.
  	 */
  	forwarders = NULL;
  	if (cfg_map_get(zoptions, "forwarders", &forwarders) == ISC_R_SUCCESS)
  	{
  		forwardtype = NULL;
  		(void)cfg_map_get(zoptions, "forward", &forwardtype);
  		CHECK(configure_forward(config, view, origin, forwarders,
  					forwardtype));
  	}
  
  	/*
  	 * Stub and forward zones may also refer to delegation only points.
  	 */
  	only = NULL;
  	if (cfg_map_get(zoptions, "delegation-only", &only) == ISC_R_SUCCESS)
  	{
  		if (cfg_obj_asboolean(only))
  			CHECK(dns_view_adddelegationonly(view, origin));
  	}
  
  	/*
  	 * Mark whether the zone was originally added at runtime or not
  	 */
  	dns_zone_setadded(zone, added);
  
  	signing = NULL;
  	if ((strcasecmp(ztypestr, "master") == 0 ||
  	     strcasecmp(ztypestr, "slave") == 0) &&
  	    cfg_map_get(zoptions, "inline-signing", &signing) == ISC_R_SUCCESS &&
  	    cfg_obj_asboolean(signing))
  	{
  		dns_zone_getraw(zone, &raw);
  		if (raw == NULL) {
  			CHECK(dns_zone_create(&raw, mctx));
  			CHECK(dns_zone_setorigin(raw, origin));
  			dns_zone_setview(raw, view);
  			if (view->acache != NULL)
  				dns_zone_setacache(raw, view->acache);
  			dns_zone_setstats(raw, ns_g_server->zonestats);
  			CHECK(dns_zone_link(zone, raw));
  		}
  	}
  
  	/*
  	 * Configure the zone.
  	 */
  	CHECK(ns_zone_configure(config, vconfig, zconfig, aclconf, zone, raw));
  
  	/*
  	 * Add the zone to its view in the new view list.
  	 */
  	CHECK(dns_view_addzone(view, zone));
  
  	/*
  	 * Ensure that zone keys are reloaded on reconfig
  	 */
  	if ((dns_zone_getkeyopts(zone) & DNS_ZONEKEY_MAINTAIN) != 0)
  		dns_zone_rekey(zone, ISC_FALSE);
  
   cleanup:
  	if (zone != NULL)
  		dns_zone_detach(&zone);
  	if (raw != NULL)
  		dns_zone_detach(&raw);
  	if (pview != NULL)
  		dns_view_detach(&pview);
  
  	return (result);
  }
  
  /*
   * Configure built-in zone for storing managed-key data.
   */
  
  #define KEYZONE "managed-keys.bind"
  #define MKEYS ".mkeys"
  
  static isc_result_t
  add_keydata_zone(dns_view_t *view, const char *directory, isc_mem_t *mctx) {
  	isc_result_t result;
  	dns_view_t *pview = NULL;
  	dns_zone_t *zone = NULL;
  	dns_acl_t *none = NULL;
  	char filename[PATH_MAX];
  	char buffer[ISC_SHA256_DIGESTSTRINGLENGTH + sizeof(MKEYS)];
  	int n;
  
  	REQUIRE(view != NULL);
  
  	/* See if we can re-use an existing keydata zone. */
  	result = dns_viewlist_find(&ns_g_server->viewlist,
  				   view->name, view->rdclass,
  				   &pview);
  	if (result != ISC_R_NOTFOUND &&
  	    result != ISC_R_SUCCESS)
  		return (result);
  
  	if (pview != NULL && pview->managed_keys != NULL) {
  		dns_zone_attach(pview->managed_keys, &view->managed_keys);
  		dns_zone_setview(pview->managed_keys, view);
  		dns_view_detach(&pview);
  		dns_zone_synckeyzone(view->managed_keys);
  		return (ISC_R_SUCCESS);
  	}
  
  	/* No existing keydata zone was found; create one */
  	CHECK(dns_zone_create(&zone, mctx));
  	CHECK(dns_zone_setorigin(zone, dns_rootname));
  
  	isc_sha256_data((void *)view->name, strlen(view->name), buffer);
  	strcat(buffer, MKEYS);
  	n = snprintf(filename, sizeof(filename), "%s%s%s",
  		     directory ? directory : "", directory ? "/" : "",
  		     strcmp(view->name, "_default") == 0 ? KEYZONE : buffer);
  	if (n < 0 || (size_t)n >= sizeof(filename)) {
  		result = (n < 0) ? ISC_R_FAILURE : ISC_R_NOSPACE;
  		goto cleanup;
  	}
  	CHECK(dns_zone_setfile(zone, filename));
  
  	dns_zone_setview(zone, view);
  	dns_zone_settype(zone, dns_zone_key);
  	dns_zone_setclass(zone, view->rdclass);
  
  	CHECK(dns_zonemgr_managezone(ns_g_server->zonemgr, zone));
  
  	if (view->acache != NULL)
  		dns_zone_setacache(zone, view->acache);
  
  	CHECK(dns_acl_none(mctx, &none));
  	dns_zone_setqueryacl(zone, none);
  	dns_zone_setqueryonacl(zone, none);
  	dns_acl_detach(&none);
  
  	dns_zone_setdialup(zone, dns_dialuptype_no);
  	dns_zone_setnotifytype(zone, dns_notifytype_no);
  	dns_zone_setoption(zone, DNS_ZONEOPT_NOCHECKNS, ISC_TRUE);
  	dns_zone_setjournalsize(zone, 0);
  
  	dns_zone_setstats(zone, ns_g_server->zonestats);
  	CHECK(setquerystats(zone, mctx, ISC_FALSE));
  
  	if (view->managed_keys != NULL)
  		dns_zone_detach(&view->managed_keys);
  	dns_zone_attach(zone, &view->managed_keys);
  
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  		      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  		      "set up managed keys zone for view %s, file '%s'",
  		      view->name, filename);
  
  cleanup:
  	if (zone != NULL)
  		dns_zone_detach(&zone);
  	if (none != NULL)
  		dns_acl_detach(&none);
  
  	return (result);
  }
  
  /*
   * Configure a single server quota.
   */
  static void
  configure_server_quota(const cfg_obj_t **maps, const char *name,
  		       isc_quota_t *quota)
  {
  	const cfg_obj_t *obj = NULL;
  	isc_result_t result;
  
  	result = ns_config_get(maps, name, &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	isc_quota_max(quota, cfg_obj_asuint32(obj));
  }
  
  /*
   * This function is called as soon as the 'directory' statement has been
   * parsed.  This can be extended to support other options if necessary.
   */
  static isc_result_t
  directory_callback(const char *clausename, const cfg_obj_t *obj, void *arg) {
  	isc_result_t result;
  	const char *directory;
  
  	REQUIRE(strcasecmp("directory", clausename) == 0);
  
  	UNUSED(arg);
  	UNUSED(clausename);
  
  	/*
  	 * Change directory.
  	 */
  	directory = cfg_obj_asstring(obj);
  
  	if (! isc_file_ischdiridempotent(directory))
  		cfg_obj_log(obj, ns_g_lctx, ISC_LOG_WARNING,
  			    "option 'directory' contains relative path '%s'",
  			    directory);
  
  	result = isc_dir_chdir(directory);
  	if (result != ISC_R_SUCCESS) {
  		cfg_obj_log(obj, ns_g_lctx, ISC_LOG_ERROR,
  			    "change directory to '%s' failed: %s",
  			    directory, isc_result_totext(result));
  		return (result);
  	}
  
  	return (ISC_R_SUCCESS);
  }
  
  static void
  scan_interfaces(ns_server_t *server, isc_boolean_t verbose) {
  	isc_boolean_t match_mapped = server->aclenv.match_mapped;
  
  	ns_interfacemgr_scan(server->interfacemgr, verbose);
  	/*
  	 * Update the "localhost" and "localnets" ACLs to match the
  	 * current set of network interfaces.
  	 */
  	dns_aclenv_copy(&server->aclenv,
  			ns_interfacemgr_getaclenv(server->interfacemgr));
  
  	server->aclenv.match_mapped = match_mapped;
  }
  
  static isc_result_t
  add_listenelt(isc_mem_t *mctx, ns_listenlist_t *list, isc_sockaddr_t *addr,
  	      isc_boolean_t wcardport_ok)
  {
  	ns_listenelt_t *lelt = NULL;
  	dns_acl_t *src_acl = NULL;
  	isc_result_t result;
  	isc_sockaddr_t any_sa6;
  	isc_netaddr_t netaddr;
  
  	REQUIRE(isc_sockaddr_pf(addr) == AF_INET6);
  
  	isc_sockaddr_any6(&any_sa6);
  	if (!isc_sockaddr_equal(&any_sa6, addr) &&
  	    (wcardport_ok || isc_sockaddr_getport(addr) != 0)) {
  		isc_netaddr_fromin6(&netaddr, &addr->type.sin6.sin6_addr);
  
  		result = dns_acl_create(mctx, 0, &src_acl);
  		if (result != ISC_R_SUCCESS)
  			return (result);
  
  		result = dns_iptable_addprefix(src_acl->iptable,
  					       &netaddr, 128, ISC_TRUE);
  		if (result != ISC_R_SUCCESS)
  			goto clean;
  
  		result = ns_listenelt_create(mctx, isc_sockaddr_getport(addr),
  					     src_acl, &lelt);
  		if (result != ISC_R_SUCCESS)
  			goto clean;
  		ISC_LIST_APPEND(list->elts, lelt, link);
  	}
  
  	return (ISC_R_SUCCESS);
  
   clean:
  	INSIST(lelt == NULL);
  	dns_acl_detach(&src_acl);
  
  	return (result);
  }
  
  /*
   * Make a list of xxx-source addresses and call ns_interfacemgr_adjust()
   * to update the listening interfaces accordingly.
   * We currently only consider IPv6, because this only affects IPv6 wildcard
   * sockets.
   */
  static void
  adjust_interfaces(ns_server_t *server, isc_mem_t *mctx) {
  	isc_result_t result;
  	ns_listenlist_t *list = NULL;
  	dns_view_t *view;
  	dns_zone_t *zone, *next;
  	isc_sockaddr_t addr, *addrp;
  
  	result = ns_listenlist_create(mctx, &list);
  	if (result != ISC_R_SUCCESS)
  		return;
  
  	for (view = ISC_LIST_HEAD(server->viewlist);
  	     view != NULL;
  	     view = ISC_LIST_NEXT(view, link)) {
  		dns_dispatch_t *dispatch6;
  
  		dispatch6 = dns_resolver_dispatchv6(view->resolver);
  		if (dispatch6 == NULL)
  			continue;
  		result = dns_dispatch_getlocaladdress(dispatch6, &addr);
  		if (result != ISC_R_SUCCESS)
  			goto fail;
  
  		/*
  		 * We always add non-wildcard address regardless of whether
  		 * the port is 'any' (the fourth arg is TRUE): if the port is
  		 * specific, we need to add it since it may conflict with a
  		 * listening interface; if it's zero, we'll dynamically open
  		 * query ports, and some of them may override an existing
  		 * wildcard IPv6 port.
  		 */
  		result = add_listenelt(mctx, list, &addr, ISC_TRUE);
  		if (result != ISC_R_SUCCESS)
  			goto fail;
  	}
  
  	zone = NULL;
  	for (result = dns_zone_first(server->zonemgr, &zone);
  	     result == ISC_R_SUCCESS;
  	     next = NULL, result = dns_zone_next(zone, &next), zone = next) {
  		dns_view_t *zoneview;
  
  		/*
  		 * At this point the zone list may contain a stale zone
  		 * just removed from the configuration.  To see the validity,
  		 * check if the corresponding view is in our current view list.
  		 * There may also be old zones that are still in the process
  		 * of shutting down and have detached from their old view
  		 * (zoneview == NULL).
  		 */
  		zoneview = dns_zone_getview(zone);
  		if (zoneview == NULL)
  			continue;
  		for (view = ISC_LIST_HEAD(server->viewlist);
  		     view != NULL && view != zoneview;
  		     view = ISC_LIST_NEXT(view, link))
  			;
  		if (view == NULL)
  			continue;
  
  		addrp = dns_zone_getnotifysrc6(zone);
  		result = add_listenelt(mctx, list, addrp, ISC_FALSE);
  		if (result != ISC_R_SUCCESS)
  			goto fail;
  
  		addrp = dns_zone_getxfrsource6(zone);
  		result = add_listenelt(mctx, list, addrp, ISC_FALSE);
  		if (result != ISC_R_SUCCESS)
  			goto fail;
  	}
  
  	ns_interfacemgr_adjust(server->interfacemgr, list, ISC_TRUE);
  
   clean:
  	ns_listenlist_detach(&list);
  	return;
  
   fail:
  	/*
  	 * Even when we failed the procedure, most of other interfaces
  	 * should work correctly.  We therefore just warn it.
  	 */
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  		      NS_LOGMODULE_SERVER, ISC_LOG_WARNING,
  		      "could not adjust the listen-on list; "
  		      "some interfaces may not work");
  	goto clean;
  }
  
  /*
   * This event callback is invoked to do periodic network
   * interface scanning.
   */
  static void
  interface_timer_tick(isc_task_t *task, isc_event_t *event) {
  	isc_result_t result;
  	ns_server_t *server = (ns_server_t *) event->ev_arg;
  	INSIST(task == server->task);
  	UNUSED(task);
  	isc_event_free(&event);
  	/*
  	 * XXX should scan interfaces unlocked and get exclusive access
  	 * only to replace ACLs.
  	 */
  	result = isc_task_beginexclusive(server->task);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  	scan_interfaces(server, ISC_FALSE);
  	isc_task_endexclusive(server->task);
  }
  
  static void
  heartbeat_timer_tick(isc_task_t *task, isc_event_t *event) {
  	ns_server_t *server = (ns_server_t *) event->ev_arg;
  	dns_view_t *view;
  
  	UNUSED(task);
  	isc_event_free(&event);
  	view = ISC_LIST_HEAD(server->viewlist);
  	while (view != NULL) {
  		dns_view_dialup(view);
  		view = ISC_LIST_NEXT(view, link);
  	}
  }
  
  static void
  pps_timer_tick(isc_task_t *task, isc_event_t *event) {
  	static unsigned int oldrequests = 0;
  	unsigned int requests = ns_client_requests;
  
  	UNUSED(task);
  	isc_event_free(&event);
  
  	/*
  	 * Don't worry about wrapping as the overflow result will be right.
  	 */
  	dns_pps = (requests - oldrequests) / 1200;
  	oldrequests = requests;
  }
  
  /*
   * Replace the current value of '*field', a dynamically allocated
   * string or NULL, with a dynamically allocated copy of the
   * null-terminated string pointed to by 'value', or NULL.
   */
  static isc_result_t
  setstring(ns_server_t *server, char **field, const char *value) {
  	char *copy;
  
  	if (value != NULL) {
  		copy = isc_mem_strdup(server->mctx, value);
  		if (copy == NULL)
  			return (ISC_R_NOMEMORY);
  	} else {
  		copy = NULL;
  	}
  
  	if (*field != NULL)
  		isc_mem_free(server->mctx, *field);
  
  	*field = copy;
  	return (ISC_R_SUCCESS);
  }
  
  /*
   * Replace the current value of '*field', a dynamically allocated
   * string or NULL, with another dynamically allocated string
   * or NULL if whether 'obj' is a string or void value, respectively.
   */
  static isc_result_t
  setoptstring(ns_server_t *server, char **field, const cfg_obj_t *obj) {
  	if (cfg_obj_isvoid(obj))
  		return (setstring(server, field, NULL));
  	else
  		return (setstring(server, field, cfg_obj_asstring(obj)));
  }
  
  static void
  set_limit(const cfg_obj_t **maps, const char *configname,
  	  const char *description, isc_resource_t resourceid,
  	  isc_resourcevalue_t defaultvalue)
  {
  	const cfg_obj_t *obj = NULL;
  	const char *resource;
  	isc_resourcevalue_t value;
  	isc_result_t result;
  
  	if (ns_config_get(maps, configname, &obj) != ISC_R_SUCCESS)
  		return;
  
  	if (cfg_obj_isstring(obj)) {
  		resource = cfg_obj_asstring(obj);
  		if (strcasecmp(resource, "unlimited") == 0)
  			value = ISC_RESOURCE_UNLIMITED;
  		else {
  			INSIST(strcasecmp(resource, "default") == 0);
  			value = defaultvalue;
  		}
  	} else
  		value = cfg_obj_asuint64(obj);
  
  	result = isc_resource_setlimit(resourceid, value);
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
  		      result == ISC_R_SUCCESS ?
  			ISC_LOG_DEBUG(3) : ISC_LOG_WARNING,
  		      "set maximum %s to %" ISC_PRINT_QUADFORMAT "u: %s",
  		      description, value, isc_result_totext(result));
  }
  
  #define SETLIMIT(cfgvar, resource, description) \
  	set_limit(maps, cfgvar, description, isc_resource_ ## resource, \
  		  ns_g_init ## resource)
  
  static void
  set_limits(const cfg_obj_t **maps) {
  	SETLIMIT("stacksize", stacksize, "stack size");
  	SETLIMIT("datasize", datasize, "data size");
  	SETLIMIT("coresize", coresize, "core size");
  	SETLIMIT("files", openfiles, "open files");
  }
  
  static void
  portset_fromconf(isc_portset_t *portset, const cfg_obj_t *ports,
  		 isc_boolean_t positive)
  {
  	const cfg_listelt_t *element;
  
  	for (element = cfg_list_first(ports);
  	     element != NULL;
  	     element = cfg_list_next(element)) {
  		const cfg_obj_t *obj = cfg_listelt_value(element);
  
  		if (cfg_obj_isuint32(obj)) {
  			in_port_t port = (in_port_t)cfg_obj_asuint32(obj);
  
  			if (positive)
  				isc_portset_add(portset, port);
  			else
  				isc_portset_remove(portset, port);
  		} else {
  			const cfg_obj_t *obj_loport, *obj_hiport;
  			in_port_t loport, hiport;
  
  			obj_loport = cfg_tuple_get(obj, "loport");
  			loport = (in_port_t)cfg_obj_asuint32(obj_loport);
  			obj_hiport = cfg_tuple_get(obj, "hiport");
  			hiport = (in_port_t)cfg_obj_asuint32(obj_hiport);
  
  			if (positive)
  				isc_portset_addrange(portset, loport, hiport);
  			else {
  				isc_portset_removerange(portset, loport,
  							hiport);
  			}
  		}
  	}
  }
  
  static isc_result_t
  removed(dns_zone_t *zone, void *uap) {
  	const char *type;
  
  	if (dns_zone_getview(zone) != uap)
  		return (ISC_R_SUCCESS);
  
  	switch (dns_zone_gettype(zone)) {
  	case dns_zone_master:
  		type = "master";
  		break;
  	case dns_zone_slave:
  		type = "slave";
  		break;
  	case dns_zone_stub:
  		type = "stub";
  		break;
  	case dns_zone_redirect:
  		type = "redirect";
  		break;
  	default:
  		type = "other";
  		break;
  	}
  	dns_zone_log(zone, ISC_LOG_INFO, "(%s) removed", type);
  	return (ISC_R_SUCCESS);
  }
  
  static void
  cleanup_session_key(ns_server_t *server, isc_mem_t *mctx) {
  	if (server->session_keyfile != NULL) {
  		isc_file_remove(server->session_keyfile);
  		isc_mem_free(mctx, server->session_keyfile);
  		server->session_keyfile = NULL;
  	}
  
  	if (server->session_keyname != NULL) {
  		if (dns_name_dynamic(server->session_keyname))
  			dns_name_free(server->session_keyname, mctx);
  		isc_mem_put(mctx, server->session_keyname, sizeof(dns_name_t));
  		server->session_keyname = NULL;
  	}
  
  	if (server->sessionkey != NULL)
  		dns_tsigkey_detach(&server->sessionkey);
  
  	server->session_keyalg = DST_ALG_UNKNOWN;
  	server->session_keybits = 0;
  }
  
  static isc_result_t
  generate_session_key(const char *filename, const char *keynamestr,
  		     dns_name_t *keyname, const char *algstr,
  		     dns_name_t *algname, unsigned int algtype,
  		     isc_uint16_t bits, isc_mem_t *mctx,
  		     dns_tsigkey_t **tsigkeyp)
  {
  	isc_result_t result = ISC_R_SUCCESS;
  	dst_key_t *key = NULL;
  	isc_buffer_t key_txtbuffer;
  	isc_buffer_t key_rawbuffer;
  	char key_txtsecret[256];
  	char key_rawsecret[64];
  	isc_region_t key_rawregion;
  	isc_stdtime_t now;
  	dns_tsigkey_t *tsigkey = NULL;
  	FILE *fp = NULL;
  
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  		      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  		      "generating session key for dynamic DNS");
  
  	/* generate key */
  	result = dst_key_generate(keyname, algtype, bits, 1, 0,
  				  DNS_KEYPROTO_ANY, dns_rdataclass_in,
  				  mctx, &key);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	/*
  	 * Dump the key to the buffer for later use.  Should be done before
  	 * we transfer the ownership of key to tsigkey.
  	 */
  	isc_buffer_init(&key_rawbuffer, &key_rawsecret, sizeof(key_rawsecret));
  	CHECK(dst_key_tobuffer(key, &key_rawbuffer));
  
  	isc_buffer_usedregion(&key_rawbuffer, &key_rawregion);
  	isc_buffer_init(&key_txtbuffer, &key_txtsecret, sizeof(key_txtsecret));
  	CHECK(isc_base64_totext(&key_rawregion, -1, "", &key_txtbuffer));
  
  	/* Store the key in tsigkey. */
  	isc_stdtime_get(&now);
  	CHECK(dns_tsigkey_createfromkey(dst_key_name(key), algname, key,
  					ISC_FALSE, NULL, now, now, mctx, NULL,
  					&tsigkey));
  
  	/* Dump the key to the key file. */
  	fp = ns_os_openfile(filename, S_IRUSR|S_IWUSR, ISC_TRUE);
  	if (fp == NULL) {
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  			      "could not create %s", filename);
  		result = ISC_R_NOPERM;
  		goto cleanup;
  	}
  
  	fprintf(fp, "key \"%s\" {\n"
  		"\talgorithm %s;\n"
  		"\tsecret \"%.*s\";\n};\n", keynamestr, algstr,
  		(int) isc_buffer_usedlength(&key_txtbuffer),
  		(char*) isc_buffer_base(&key_txtbuffer));
  
  	RUNTIME_CHECK(isc_stdio_flush(fp) == ISC_R_SUCCESS);
  	RUNTIME_CHECK(isc_stdio_close(fp) == ISC_R_SUCCESS);
  
  	dst_key_free(&key);
  
  	*tsigkeyp = tsigkey;
  
  	return (ISC_R_SUCCESS);
  
    cleanup:
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  		      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  		      "failed to generate session key "
  		      "for dynamic DNS: %s", isc_result_totext(result));
  	if (tsigkey != NULL)
  		dns_tsigkey_detach(&tsigkey);
  	if (key != NULL)
  		dst_key_free(&key);
  
  	return (result);
  }
  
  static isc_result_t
  configure_session_key(const cfg_obj_t **maps, ns_server_t *server,
  		      isc_mem_t *mctx)
  {
  	const char *keyfile, *keynamestr, *algstr;
  	unsigned int algtype;
  	dns_fixedname_t fname;
  	dns_name_t *keyname, *algname;
  	isc_buffer_t buffer;
  	isc_uint16_t bits;
  	const cfg_obj_t *obj;
  	isc_boolean_t need_deleteold = ISC_FALSE;
  	isc_boolean_t need_createnew = ISC_FALSE;
  	isc_result_t result;
  
  	obj = NULL;
  	result = ns_config_get(maps, "session-keyfile", &obj);
  	if (result == ISC_R_SUCCESS) {
  		if (cfg_obj_isvoid(obj))
  			keyfile = NULL; /* disable it */
  		else
  			keyfile = cfg_obj_asstring(obj);
  	} else
  		keyfile = ns_g_defaultsessionkeyfile;
  
  	obj = NULL;
  	result = ns_config_get(maps, "session-keyname", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	keynamestr = cfg_obj_asstring(obj);
  	dns_fixedname_init(&fname);
  	isc_buffer_init(&buffer, keynamestr, strlen(keynamestr));
  	isc_buffer_add(&buffer, strlen(keynamestr));
  	keyname = dns_fixedname_name(&fname);
  	result = dns_name_fromtext(keyname, &buffer, dns_rootname, 0, NULL);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	obj = NULL;
  	result = ns_config_get(maps, "session-keyalg", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	algstr = cfg_obj_asstring(obj);
  	algname = NULL;
  	result = ns_config_getkeyalgorithm2(algstr, &algname, &algtype, &bits);
  	if (result != ISC_R_SUCCESS) {
  		const char *s = " (keeping current key)";
  
  		cfg_obj_log(obj, ns_g_lctx, ISC_LOG_ERROR, "session-keyalg: "
  			    "unsupported or unknown algorithm '%s'%s",
  			    algstr,
  			    server->session_keyfile != NULL ? s : "");
  		return (result);
  	}
  
  	/* See if we need to (re)generate a new key. */
  	if (keyfile == NULL) {
  		if (server->session_keyfile != NULL)
  			need_deleteold = ISC_TRUE;
  	} else if (server->session_keyfile == NULL)
  		need_createnew = ISC_TRUE;
  	else if (strcmp(keyfile, server->session_keyfile) != 0 ||
  		 !dns_name_equal(server->session_keyname, keyname) ||
  		 server->session_keyalg != algtype ||
  		 server->session_keybits != bits) {
  		need_deleteold = ISC_TRUE;
  		need_createnew = ISC_TRUE;
  	}
  
  	if (need_deleteold) {
  		INSIST(server->session_keyfile != NULL);
  		INSIST(server->session_keyname != NULL);
  		INSIST(server->sessionkey != NULL);
  
  		cleanup_session_key(server, mctx);
  	}
  
  	if (need_createnew) {
  		INSIST(server->sessionkey == NULL);
  		INSIST(server->session_keyfile == NULL);
  		INSIST(server->session_keyname == NULL);
  		INSIST(server->session_keyalg == DST_ALG_UNKNOWN);
  		INSIST(server->session_keybits == 0);
  
  		server->session_keyname = isc_mem_get(mctx, sizeof(dns_name_t));
  		if (server->session_keyname == NULL)
  			goto cleanup;
  		dns_name_init(server->session_keyname, NULL);
  		CHECK(dns_name_dup(keyname, mctx, server->session_keyname));
  
  		server->session_keyfile = isc_mem_strdup(mctx, keyfile);
  		if (server->session_keyfile == NULL)
  			goto cleanup;
  
  		server->session_keyalg = algtype;
  		server->session_keybits = bits;
  
  		CHECK(generate_session_key(keyfile, keynamestr, keyname, algstr,
  					   algname, algtype, bits, mctx,
  					   &server->sessionkey));
  	}
  
  	return (result);
  
    cleanup:
  	cleanup_session_key(server, mctx);
  	return (result);
  }
  
  static isc_result_t
  setup_newzones(dns_view_t *view, cfg_obj_t *config, cfg_obj_t *vconfig,
  	       cfg_parser_t *parser, cfg_aclconfctx_t *actx)
  {
  	isc_result_t result = ISC_R_SUCCESS;
  	isc_boolean_t allow = ISC_FALSE;
  	struct cfg_context *nzcfg = NULL;
  	cfg_parser_t *nzparser = NULL;
  	cfg_obj_t *nzconfig = NULL;
  	const cfg_obj_t *maps[4];
  	const cfg_obj_t *options = NULL, *voptions = NULL;
  	const cfg_obj_t *nz = NULL;
  	int i = 0;
  
  	REQUIRE (config != NULL);
  
  	if (vconfig != NULL)
  		voptions = cfg_tuple_get(vconfig, "options");
  	if (voptions != NULL)
  		maps[i++] = voptions;
  	result = cfg_map_get(config, "options", &options);
  	if (result == ISC_R_SUCCESS)
  		maps[i++] = options;
  	maps[i++] = ns_g_defaults;
  	maps[i] = NULL;
  
  	result = ns_config_get(maps, "allow-new-zones", &nz);
  	if (result == ISC_R_SUCCESS)
  		allow = cfg_obj_asboolean(nz);
  
  	if (!allow) {
  		dns_view_setnewzones(view, ISC_FALSE, NULL, NULL);
  		return (ISC_R_SUCCESS);
  	}
  
  	nzcfg = isc_mem_get(view->mctx, sizeof(*nzcfg));
  	if (nzcfg == NULL) {
  		dns_view_setnewzones(view, ISC_FALSE, NULL, NULL);
  		return (ISC_R_NOMEMORY);
  	}
  
  	dns_view_setnewzones(view, allow, nzcfg, newzone_cfgctx_destroy);
  
  	memset(nzcfg, 0, sizeof(*nzcfg));
  	isc_mem_attach(view->mctx, &nzcfg->mctx);
  	cfg_obj_attach(config, &nzcfg->config);
  	cfg_parser_attach(parser, &nzcfg->parser);
  	cfg_aclconfctx_attach(actx, &nzcfg->actx);
  
  	/*
  	 * Attempt to create a parser and parse the newzones
  	 * file.  If successful, preserve both; otherwise leave
  	 * them NULL.
  	 */
  	result = cfg_parser_create(view->mctx, ns_g_lctx, &nzparser);
  	if (result == ISC_R_SUCCESS)
  		result = cfg_parse_file(nzparser, view->new_zone_file,
  					&cfg_type_newzones, &nzconfig);
  	if (result == ISC_R_SUCCESS) {
  		cfg_parser_attach(nzparser, &nzcfg->nzparser);
  		cfg_obj_attach(nzconfig, &nzcfg->nzconfig);
  	}
  
  	if (nzparser != NULL) {
  		if (nzconfig != NULL)
  			cfg_obj_destroy(nzparser, &nzconfig);
  		cfg_parser_destroy(&nzparser);
  	}
  
  	return (ISC_R_SUCCESS);
  }
  
  static int
  count_zones(const cfg_obj_t *conf) {
  	const cfg_obj_t *zonelist = NULL;
  	const cfg_listelt_t *element;
  	int n = 0;
  
  	REQUIRE(conf != NULL);
  
  	cfg_map_get(conf, "zone", &zonelist);
  	for (element = cfg_list_first(zonelist);
  	     element != NULL;
  	     element = cfg_list_next(element))
  		n++;
  
  	return (n);
  }
  
  static isc_result_t
  load_configuration(const char *filename, ns_server_t *server,
  		   isc_boolean_t first_time)
  {
  	cfg_obj_t *config = NULL, *bindkeys = NULL;
  	cfg_parser_t *conf_parser = NULL, *bindkeys_parser = NULL;
  	const cfg_listelt_t *element;
  	const cfg_obj_t *builtin_views;
  	const cfg_obj_t *maps[3];
  	const cfg_obj_t *obj;
  	const cfg_obj_t *options;
  	const cfg_obj_t *usev4ports, *avoidv4ports, *usev6ports, *avoidv6ports;
  	const cfg_obj_t *views;
  	const cfg_obj_t *mysqlip;
  	dns_view_t *view = NULL;
  	dns_view_t *view_next;
  	dns_viewlist_t tmpviewlist;
  	dns_viewlist_t viewlist, builtin_viewlist;
  	in_port_t listen_port, udpport_low, udpport_high;
  	int i;
  	isc_interval_t interval;
  	isc_portset_t *v4portset = NULL;
  	isc_portset_t *v6portset = NULL;
  	isc_resourcevalue_t nfiles;
  	isc_result_t result;
  	isc_uint32_t heartbeat_interval;
  	isc_uint32_t interface_interval;
  	isc_uint32_t reserved;
  	isc_uint32_t udpsize;
  	ns_cachelist_t cachelist, tmpcachelist;
  	unsigned int maxsocks;
  	ns_cache_t *nsc;
  	struct cfg_context *nzctx;
  	int num_zones = 0;
  	isc_boolean_t exclusive = ISC_FALSE;
  
  	ISC_LIST_INIT(viewlist);
  	ISC_LIST_INIT(builtin_viewlist);
  	ISC_LIST_INIT(cachelist);
  
  	/* Create the ACL configuration context */
  	if (ns_g_aclconfctx != NULL)
  		cfg_aclconfctx_detach(&ns_g_aclconfctx);
  	CHECK(cfg_aclconfctx_create(ns_g_mctx, &ns_g_aclconfctx));
  
  	/*
  	 * Parse the global default pseudo-config file.
  	 */
  	if (first_time) {
  		CHECK(ns_config_parsedefaults(ns_g_parser, &ns_g_config));
  		RUNTIME_CHECK(cfg_map_get(ns_g_config, "options",
  					  &ns_g_defaults) == ISC_R_SUCCESS);
  	}
  
  	/*
  	 * Parse the configuration file using the new config code.
  	 */
  	result = ISC_R_FAILURE;
  	config = NULL;
  
  	/*
  	 * Unless this is lwresd with the -C option, parse the config file.
  	 */
  	if (!(ns_g_lwresdonly && lwresd_g_useresolvconf)) {
  		isc_log_write(ns_g_lctx,
  			      NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
  			      ISC_LOG_INFO, "loading configuration from '%s'",
  			      filename);
  		CHECK(cfg_parser_create(ns_g_mctx, ns_g_lctx, &conf_parser));
  		cfg_parser_setcallback(conf_parser, directory_callback, NULL);
  		result = cfg_parse_file(conf_parser, filename,
  					&cfg_type_namedconf, &config);
  	}
  
  	/*
  	 * If this is lwresd with the -C option, or lwresd with no -C or -c
  	 * option where the above parsing failed, parse resolv.conf.
  	 */
  	if (ns_g_lwresdonly &&
  	    (lwresd_g_useresolvconf ||
  	     (!ns_g_conffileset && result == ISC_R_FILENOTFOUND)))
  	{
  		isc_log_write(ns_g_lctx,
  			      NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
  			      ISC_LOG_INFO, "loading configuration from '%s'",
  			      lwresd_g_resolvconffile);
  		if (conf_parser != NULL)
  			cfg_parser_destroy(&conf_parser);
  		CHECK(cfg_parser_create(ns_g_mctx, ns_g_lctx, &conf_parser));
  		result = ns_lwresd_parseeresolvconf(ns_g_mctx, conf_parser,
  						    &config);
  	}
  	CHECK(result);
  
  	/*
  	 * Check the validity of the configuration.
  	 */
  	CHECK(bind9_check_namedconf(config, ns_g_lctx, ns_g_mctx));
  
  	/*
  	 * Fill in the maps array, used for resolving defaults.
  	 */
  	i = 0;
  	options = NULL;
  	result = cfg_map_get(config, "options", &options);
  	if (result == ISC_R_SUCCESS)
  		maps[i++] = options;
  	maps[i++] = ns_g_defaults;
  	maps[i] = NULL;
  
  	/*
  	 * If bind.keys exists, load it.  If "dnssec-lookaside auto"
  	 * is turned on, the keys found there will be used as default
  	 * trust anchors.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "bindkeys-file", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	CHECKM(setstring(server, &server->bindkeysfile,
  	       cfg_obj_asstring(obj)), "strdup");
  
  	if (access(server->bindkeysfile, R_OK) == 0) {
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "reading built-in trusted "
  			      "keys from file '%s'", server->bindkeysfile);
  
  		CHECK(cfg_parser_create(ns_g_mctx, ns_g_lctx,
  					&bindkeys_parser));
  
  		result = cfg_parse_file(bindkeys_parser, server->bindkeysfile,
  					&cfg_type_bindkeys, &bindkeys);
  		CHECK(result);
  	}
  
  	/* Ensure exclusive access to configuration data. */
  	if (!exclusive) {
  		result = isc_task_beginexclusive(server->task);
  		RUNTIME_CHECK(result == ISC_R_SUCCESS);
  		exclusive = ISC_TRUE;
  	}
  
  	/*
  	 * Set process limits, which (usually) needs to be done as root.
  	 */
  	set_limits(maps);
  
  	/*
  	 * Check if max number of open sockets that the system allows is
  	 * sufficiently large.	Failing this condition is not necessarily fatal,
  	 * but may cause subsequent runtime failures for a busy recursive
  	 * server.
  	 */
  	result = isc_socketmgr_getmaxsockets(ns_g_socketmgr, &maxsocks);
  	if (result != ISC_R_SUCCESS)
  		maxsocks = 0;
  	result = isc_resource_getcurlimit(isc_resource_openfiles, &nfiles);
  	if (result == ISC_R_SUCCESS && (isc_resourcevalue_t)maxsocks > nfiles) {
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_WARNING,
  			      "max open files (%" ISC_PRINT_QUADFORMAT "u)"
  			      " is smaller than max sockets (%u)",
  			      nfiles, maxsocks);
  	}
  
  	/*
  	 * Set the number of socket reserved for TCP, stdio etc.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "reserved-sockets", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	reserved = cfg_obj_asuint32(obj);
  	if (maxsocks != 0) {
  		if (maxsocks < 128U)			/* Prevent underflow. */
  			reserved = 0;
  		else if (reserved > maxsocks - 128U)	/* Minimum UDP space. */
  			reserved = maxsocks - 128;
  	}
  	/* Minimum TCP/stdio space. */
  	if (reserved < 128U)
  		reserved = 128;
  	if (reserved + 128U > maxsocks && maxsocks != 0) {
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_WARNING,
  			      "less than 128 UDP sockets available after "
  			      "applying 'reserved-sockets' and 'maxsockets'");
  	}
  	isc__socketmgr_setreserved(ns_g_socketmgr, reserved);
  
  	/*
  	 * Configure various server options.
  	 */
  	configure_server_quota(maps, "transfers-out", &server->xfroutquota);
  	configure_server_quota(maps, "tcp-clients", &server->tcpquota);
  	configure_server_quota(maps, "recursive-clients",
  			       &server->recursionquota);
  	if (server->recursionquota.max > 1000)
  		isc_quota_soft(&server->recursionquota,
  			       server->recursionquota.max - 100);
  	else
  		isc_quota_soft(&server->recursionquota, 0);
  
  	CHECK(configure_view_acl(NULL, config, "blackhole", NULL,
  				 ns_g_aclconfctx, ns_g_mctx,
  				 &server->blackholeacl));
  	if (server->blackholeacl != NULL)
  		dns_dispatchmgr_setblackhole(ns_g_dispatchmgr,
  					     server->blackholeacl);
  
  	obj = NULL;
  	result = ns_config_get(maps, "match-mapped-addresses", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	server->aclenv.match_mapped = cfg_obj_asboolean(obj);
  
  	CHECKM(ns_statschannels_configure(ns_g_server, config, ns_g_aclconfctx),
  	       "configuring statistics server(s)");
  
  	/*
  	 * Configure sets of UDP query source ports.
  	 */
  	CHECKM(isc_portset_create(ns_g_mctx, &v4portset),
  	       "creating UDP port set");
  	CHECKM(isc_portset_create(ns_g_mctx, &v6portset),
  	       "creating UDP port set");
  
  	usev4ports = NULL;
  	usev6ports = NULL;
  	avoidv4ports = NULL;
  	avoidv6ports = NULL;
  
  	(void)ns_config_get(maps, "use-v4-udp-ports", &usev4ports);
  	if (usev4ports != NULL)
  		portset_fromconf(v4portset, usev4ports, ISC_TRUE);
  	else {
  		CHECKM(isc_net_getudpportrange(AF_INET, &udpport_low,
  					       &udpport_high),
  		       "get the default UDP/IPv4 port range");
  		if (udpport_low == udpport_high)
  			isc_portset_add(v4portset, udpport_low);
  		else {
  			isc_portset_addrange(v4portset, udpport_low,
  					     udpport_high);
  		}
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "using default UDP/IPv4 port range: [%d, %d]",
  			      udpport_low, udpport_high);
  	}
  	(void)ns_config_get(maps, "avoid-v4-udp-ports", &avoidv4ports);
  	if (avoidv4ports != NULL)
  		portset_fromconf(v4portset, avoidv4ports, ISC_FALSE);
  
  	(void)ns_config_get(maps, "use-v6-udp-ports", &usev6ports);
  	if (usev6ports != NULL)
  		portset_fromconf(v6portset, usev6ports, ISC_TRUE);
  	else {
  		CHECKM(isc_net_getudpportrange(AF_INET6, &udpport_low,
  					       &udpport_high),
  		       "get the default UDP/IPv6 port range");
  		if (udpport_low == udpport_high)
  			isc_portset_add(v6portset, udpport_low);
  		else {
  			isc_portset_addrange(v6portset, udpport_low,
  					     udpport_high);
  		}
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "using default UDP/IPv6 port range: [%d, %d]",
  			      udpport_low, udpport_high);
  	}
  	(void)ns_config_get(maps, "avoid-v6-udp-ports", &avoidv6ports);
  	if (avoidv6ports != NULL)
  		portset_fromconf(v6portset, avoidv6ports, ISC_FALSE);
  
  	dns_dispatchmgr_setavailports(ns_g_dispatchmgr, v4portset, v6portset);
  
  	/*
  	 * Set the EDNS UDP size when we don't match a view.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "edns-udp-size", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	udpsize = cfg_obj_asuint32(obj);
  	if (udpsize < 512)
  		udpsize = 512;
  	if (udpsize > 4096)
  		udpsize = 4096;
  	ns_g_udpsize = (isc_uint16_t)udpsize;
  
  	/*
  	 * Configure the zone manager.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "transfers-in", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	dns_zonemgr_settransfersin(server->zonemgr, cfg_obj_asuint32(obj));
  
  	obj = NULL;
  	result = ns_config_get(maps, "transfers-per-ns", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	dns_zonemgr_settransfersperns(server->zonemgr, cfg_obj_asuint32(obj));
  
  	obj = NULL;
  	result = ns_config_get(maps, "serial-query-rate", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	dns_zonemgr_setserialqueryrate(server->zonemgr, cfg_obj_asuint32(obj));
  
  	/*
  	 * Determine which port to use for listening for incoming connections.
  	 */
  	if (ns_g_port != 0)
  		listen_port = ns_g_port;
  	else
  		CHECKM(ns_config_getport(config, &listen_port), "port");
  
  	/*
  	 * Find the listen queue depth.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "tcp-listen-queue", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	ns_g_listen = cfg_obj_asuint32(obj);
  	if (ns_g_listen < 3)
  		ns_g_listen = 3;
  
  	/*
  	 * Configure the interface manager according to the "listen-on"
  	 * statement.
  	 */
  	{
  		const cfg_obj_t *clistenon = NULL;
  		ns_listenlist_t *listenon = NULL;
  
  		clistenon = NULL;
  		/*
  		 * Even though listen-on is present in the default
  		 * configuration, we can't use it here, since it isn't
  		 * used if we're in lwresd mode.  This way is easier.
  		 */
  		if (options != NULL)
  			(void)cfg_map_get(options, "listen-on", &clistenon);
  		if (clistenon != NULL) {
  			/* check return code? */
  			(void)ns_listenlist_fromconfig(clistenon, config,
  						       ns_g_aclconfctx,
  						       ns_g_mctx, &listenon);
  		} else if (!ns_g_lwresdonly) {
  			/*
  			 * Not specified, use default.
  			 */
  			CHECK(ns_listenlist_default(ns_g_mctx, listen_port,
  						    ISC_TRUE, &listenon));
  		}
  		if (listenon != NULL) {
  			ns_interfacemgr_setlistenon4(server->interfacemgr,
  						     listenon);
  			ns_listenlist_detach(&listenon);
  		}
  	}
  	/*
  	 * Ditto for IPv6.
  	 */
  	{
  		const cfg_obj_t *clistenon = NULL;
  		ns_listenlist_t *listenon = NULL;
  
  		if (options != NULL)
  			(void)cfg_map_get(options, "listen-on-v6", &clistenon);
  		if (clistenon != NULL) {
  			/* check return code? */
  			(void)ns_listenlist_fromconfig(clistenon, config,
  						       ns_g_aclconfctx,
  						       ns_g_mctx, &listenon);
  		} else if (!ns_g_lwresdonly) {
  			isc_boolean_t enable;
  			/*
  			 * Not specified, use default.
  			 */
  			enable = ISC_TF(isc_net_probeipv4() != ISC_R_SUCCESS);
  			CHECK(ns_listenlist_default(ns_g_mctx, listen_port,
  						    enable, &listenon));
  		}
  		if (listenon != NULL) {
  			ns_interfacemgr_setlistenon6(server->interfacemgr,
  						     listenon);
  			ns_listenlist_detach(&listenon);
  		}
  	}
  
  	/*
  	 * Rescan the interface list to pick up changes in the
  	 * listen-on option.  It's important that we do this before we try
  	 * to configure the query source, since the dispatcher we use might
  	 * be shared with an interface.
  	 */
  	scan_interfaces(server, ISC_TRUE);
  
  	/*
  	 * Arrange for further interface scanning to occur periodically
  	 * as specified by the "interface-interval" option.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "interface-interval", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	interface_interval = cfg_obj_asuint32(obj) * 60;
  	if (interface_interval == 0) {
  		CHECK(isc_timer_reset(server->interface_timer,
  				      isc_timertype_inactive,
  				      NULL, NULL, ISC_TRUE));
  	} else if (server->interface_interval != interface_interval) {
  		isc_interval_set(&interval, interface_interval, 0);
  		CHECK(isc_timer_reset(server->interface_timer,
  				      isc_timertype_ticker,
  				      NULL, &interval, ISC_FALSE));
  	}
  	server->interface_interval = interface_interval;
  
  	/*
  	 * Configure the dialup heartbeat timer.
  	 */
  	obj = NULL;
  	result = ns_config_get(maps, "heartbeat-interval", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	heartbeat_interval = cfg_obj_asuint32(obj) * 60;
  	if (heartbeat_interval == 0) {
  		CHECK(isc_timer_reset(server->heartbeat_timer,
  				      isc_timertype_inactive,
  				      NULL, NULL, ISC_TRUE));
  	} else if (server->heartbeat_interval != heartbeat_interval) {
  		isc_interval_set(&interval, heartbeat_interval, 0);
  		CHECK(isc_timer_reset(server->heartbeat_timer,
  				      isc_timertype_ticker,
  				      NULL, &interval, ISC_FALSE));
  	}
  	server->heartbeat_interval = heartbeat_interval;
  
  	isc_interval_set(&interval, 1200, 0);
  	CHECK(isc_timer_reset(server->pps_timer, isc_timertype_ticker, NULL,
  			      &interval, ISC_FALSE));
  
  	/*
  	 * Write the PID file.
  	 */
  	obj = NULL;
  	if (ns_config_get(maps, "pid-file", &obj) == ISC_R_SUCCESS)
  		if (cfg_obj_isvoid(obj))
  			ns_os_writepidfile(NULL, first_time);
  		else
  			ns_os_writepidfile(cfg_obj_asstring(obj), first_time);
  	else if (ns_g_lwresdonly)
  		ns_os_writepidfile(lwresd_g_defaultpidfile, first_time);
  	else
  		ns_os_writepidfile(ns_g_defaultpidfile, first_time);
  
  	/*
  	 * Configure the server-wide session key.  This must be done before
  	 * configure views because zone configuration may need to know
  	 * session-keyname.
  	 *
  	 * Failure of session key generation isn't fatal at this time; if it
  	 * turns out that a session key is really needed but doesn't exist,
  	 * we'll treat it as a fatal error then.
  	 */
  	(void)configure_session_key(maps, server, ns_g_mctx);
  
  	views = NULL;
  	(void)cfg_map_get(config, "view", &views);
  
  	/*
  	 * Create the views and count all the configured zones in
  	 * order to correctly size the zone manager's task table.
  	 * (We only count zones for configured views; the built-in
  	 * "bind" view can be ignored as it only adds a negligible
  	 * number of zones.)
  	 *
  	 * If we're allowing new zones, we need to be able to find the
  	 * new zone file and count those as well.  So we setup the new
  	 * zone configuration context, but otherwise view configuration
  	 * waits until after the zone manager's task list has been sized.
  	 */
  	for (element = cfg_list_first(views);
  	     element != NULL;
  	     element = cfg_list_next(element))
  	{
  		cfg_obj_t *vconfig = cfg_listelt_value(element);
  		const cfg_obj_t *voptions = cfg_tuple_get(vconfig, "options");
  		view = NULL;
  
  		CHECK(create_view(vconfig, &viewlist, &view));
  		INSIST(view != NULL);
  
  		num_zones += count_zones(voptions);
  		CHECK(setup_newzones(view, config, vconfig, conf_parser,
  				     ns_g_aclconfctx));
  
  		nzctx = view->new_zone_config;
  		if (nzctx != NULL && nzctx->nzconfig != NULL)
  			num_zones += count_zones(nzctx->nzconfig);
  
  		dns_view_detach(&view);
  	}
  
  	/*
  	 * If there were no explicit views then we do the default
  	 * view here.
  	 */
  	if (views == NULL) {
  		CHECK(create_view(NULL, &viewlist, &view));
  		INSIST(view != NULL);
  
  		num_zones = count_zones(config);
  
  		CHECK(setup_newzones(view, config, NULL,  conf_parser,
  				     ns_g_aclconfctx));
  
  		nzctx = view->new_zone_config;
  		if (nzctx != NULL && nzctx->nzconfig != NULL)
  			num_zones += count_zones(nzctx->nzconfig);
  
  		dns_view_detach(&view);
  	}
  
  	/*
  	 * Zones have been counted; set the zone manager task pool size.
  	 */
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  		      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  		      "sizing zone task pool based on %d zones", num_zones);
  	CHECK(dns_zonemgr_setsize(ns_g_server->zonemgr, num_zones));
  
  	/*
  	 * Configure and freeze all explicit views.  Explicit
  	 * views that have zones were already created at parsing
  	 * time, but views with no zones must be created here.
  	 */
  	for (element = cfg_list_first(views);
  	     element != NULL;
  	     element = cfg_list_next(element))
  	{
  		cfg_obj_t *vconfig = cfg_listelt_value(element);
  
  		view = NULL;
  		CHECK(find_view(vconfig, &viewlist, &view));
  		CHECK(configure_view(view, config, vconfig,
  				     &cachelist, bindkeys, ns_g_mctx,
  				     ns_g_aclconfctx, ISC_TRUE));
  		dns_view_freeze(view);
  		dns_view_detach(&view);
  	}
  
  	/*
  	 * Make sure we have a default view if and only if there
  	 * were no explicit views.
  	 */
  	if (views == NULL) {
  		view = NULL;
  		CHECK(find_view(NULL, &viewlist, &view));
  		CHECK(configure_view(view, config, NULL,
  				     &cachelist, bindkeys,
  				     ns_g_mctx, ns_g_aclconfctx, ISC_TRUE));
  		dns_view_freeze(view);
  		dns_view_detach(&view);
  	}
  
  	/*
  	 * Create (or recreate) the built-in views.
  	 */
  	builtin_views = NULL;
  	RUNTIME_CHECK(cfg_map_get(ns_g_config, "view",
  				  &builtin_views) == ISC_R_SUCCESS);
  	for (element = cfg_list_first(builtin_views);
  	     element != NULL;
  	     element = cfg_list_next(element))
  	{
  		cfg_obj_t *vconfig = cfg_listelt_value(element);
  
  		CHECK(create_view(vconfig, &builtin_viewlist, &view));
  		CHECK(configure_view(view, config, vconfig,
  				     &cachelist, bindkeys,
  				     ns_g_mctx, ns_g_aclconfctx, ISC_FALSE));
  		dns_view_freeze(view);
  		dns_view_detach(&view);
  		view = NULL;
  	}
  
  	/* Now combine the two viewlists into one */
  	ISC_LIST_APPENDLIST(viewlist, builtin_viewlist, link);
  
  	/* Swap our new view list with the production one. */
  	tmpviewlist = server->viewlist;
  	server->viewlist = viewlist;
  	viewlist = tmpviewlist;
  
  	/* Make the view list available to each of the views */
  	view = ISC_LIST_HEAD(server->viewlist);
  	while (view != NULL) {
  		view->viewlist = &server->viewlist;
  		view = ISC_LIST_NEXT(view, link);
  	}
  
  	/* Swap our new cache list with the production one. */
  	tmpcachelist = server->cachelist;
  	server->cachelist = cachelist;
  	cachelist = tmpcachelist;
  
  	/* Load the TKEY information from the configuration. */
  	if (options != NULL) {
  		dns_tkeyctx_t *t = NULL;
  		CHECKM(ns_tkeyctx_fromconfig(options, ns_g_mctx, ns_g_entropy,
  					     &t),
  		       "configuring TKEY");
  		if (server->tkeyctx != NULL)
  			dns_tkeyctx_destroy(&server->tkeyctx);
  		server->tkeyctx = t;
  	}
  
  	/*
  	 * Bind the control port(s).
  	 */
  	CHECKM(ns_controls_configure(ns_g_server->controls, config,
  				     ns_g_aclconfctx),
  	       "binding control channel(s)");
  
  	/*
  	  * Init IP table of mysql database
  	  */
  	mysqlip = NULL;
  	if (cfg_map_get(config, "mysqlipdb", &mysqlip) == ISC_R_SUCCESS){
  		dns_mysqlip_t *ipinfo;
  		result = mysqlip_set_info(ns_g_mctx, mysqlip, &ipinfo);
  		if(result != ISC_R_SUCCESS){
  			isc_log_write(ns_g_lctx,
  				NS_LOGCATEGORY_GENERAL,
  				NS_LOGMODULE_SERVER,
  				ISC_LOG_ERROR,
  				"There is an error while setting ipinfo configuration.");
  		}else{
  			result = mysqlip_init_radix_array(ns_g_mctx, ipinfo);
  			if(result != ISC_R_SUCCESS){
  				isc_log_write(ns_g_lctx,
  					NS_LOGCATEGORY_GENERAL,
  					NS_LOGMODULE_SERVER,
  					ISC_LOG_ERROR,
  					"There is an error while initializing ip radix array of database");
  			}
  			isc_log_write(ns_g_lctx,
  				NS_LOGCATEGORY_GENERAL,
  				NS_LOGMODULE_SERVER,
  				ISC_LOG_INFO,
  				"load MysqlIP DB successfully.");
  		}
  	}
  	/*
  	 * Bind the lwresd port(s).
  	 */
  	CHECKM(ns_lwresd_configure(ns_g_mctx, config),
  	       "binding lightweight resolver ports");
  
  	/*
  	 * Open the source of entropy.
  	 */
  	if (first_time) {
  		obj = NULL;
  		result = ns_config_get(maps, "random-device", &obj);
  		if (result != ISC_R_SUCCESS) {
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  				      "no source of entropy found");
  		} else {
  			const char *randomdev = cfg_obj_asstring(obj);
  			result = isc_entropy_createfilesource(ns_g_entropy,
  							      randomdev);
  			if (result != ISC_R_SUCCESS)
  				isc_log_write(ns_g_lctx,
  					      NS_LOGCATEGORY_GENERAL,
  					      NS_LOGMODULE_SERVER,
  					      ISC_LOG_INFO,
  					      "could not open entropy source "
  					      "%s: %s",
  					      randomdev,
  					      isc_result_totext(result));
  #ifdef PATH_RANDOMDEV
  			if (ns_g_fallbackentropy != NULL) {
  				if (result != ISC_R_SUCCESS) {
  					isc_log_write(ns_g_lctx,
  						      NS_LOGCATEGORY_GENERAL,
  						      NS_LOGMODULE_SERVER,
  						      ISC_LOG_INFO,
  						      "using pre-chroot entropy source "
  						      "%s",
  						      PATH_RANDOMDEV);
  					isc_entropy_detach(&ns_g_entropy);
  					isc_entropy_attach(ns_g_fallbackentropy,
  							   &ns_g_entropy);
  				}
  				isc_entropy_detach(&ns_g_fallbackentropy);
  			}
  #endif
  		}
  	}
  
  	/*
  	 * Relinquish root privileges.
  	 */
  	if (first_time)
  		ns_os_changeuser();
  
  	/*
  	 * Check that the working directory is writable.
  	 */
  	if (access(".", W_OK) != 0) {
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  			      "the working directory is not writable");
  	}
  
  	/*
  	 * Configure the logging system.
  	 *
  	 * Do this after changing UID to make sure that any log
  	 * files specified in named.conf get created by the
  	 * unprivileged user, not root.
  	 */
  	if (ns_g_logstderr) {
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "ignoring config file logging "
  			      "statement due to -g option");
  	} else {
  		const cfg_obj_t *logobj = NULL;
  		isc_logconfig_t *logc = NULL;
  
  		CHECKM(isc_logconfig_create(ns_g_lctx, &logc),
  		       "creating new logging configuration");
  
  		logobj = NULL;
  		(void)cfg_map_get(config, "logging", &logobj);
  		if (logobj != NULL) {
  			CHECKM(ns_log_configure(logc, logobj),
  			       "configuring logging");
  		} else {
  			CHECKM(ns_log_setdefaultchannels(logc),
  			       "setting up default logging channels");
  			CHECKM(ns_log_setunmatchedcategory(logc),
  			       "setting up default 'category unmatched'");
  			CHECKM(ns_log_setdefaultcategory(logc),
  			       "setting up default 'category default'");
  		}
  
  		result = isc_logconfig_use(ns_g_lctx, logc);
  		if (result != ISC_R_SUCCESS) {
  			isc_logconfig_destroy(&logc);
  			CHECKM(result, "installing logging configuration");
  		}
  
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_DEBUG(1),
  			      "now using logging configuration from "
  			      "config file");
  	}
  
  	/*
  	 * Set the default value of the query logging flag depending
  	 * whether a "queries" category has been defined.  This is
  	 * a disgusting hack, but we need to do this for BIND 8
  	 * compatibility.
  	 */
  	if (first_time) {
  		const cfg_obj_t *logobj = NULL;
  		const cfg_obj_t *categories = NULL;
  
  		obj = NULL;
  		if (ns_config_get(maps, "querylog", &obj) == ISC_R_SUCCESS) {
  			server->log_queries = cfg_obj_asboolean(obj);
  		} else {
  
  			(void)cfg_map_get(config, "logging", &logobj);
  			if (logobj != NULL)
  				(void)cfg_map_get(logobj, "category",
  						  &categories);
  			if (categories != NULL) {
  				const cfg_listelt_t *element;
  				for (element = cfg_list_first(categories);
  				     element != NULL;
  				     element = cfg_list_next(element))
  				{
  					const cfg_obj_t *catobj;
  					const char *str;
  
  					obj = cfg_listelt_value(element);
  					catobj = cfg_tuple_get(obj, "name");
  					str = cfg_obj_asstring(catobj);
  					if (strcasecmp(str, "queries") == 0)
  						server->log_queries = ISC_TRUE;
  				}
  			}
  		}
  	}
  
  
  	obj = NULL;
  	if (options != NULL &&
  	    cfg_map_get(options, "memstatistics", &obj) == ISC_R_SUCCESS)
  		ns_g_memstatistics = cfg_obj_asboolean(obj);
  	else
  		ns_g_memstatistics =
  			ISC_TF((isc_mem_debugging & ISC_MEM_DEBUGRECORD) != 0);
  
  	obj = NULL;
  	if (ns_config_get(maps, "memstatistics-file", &obj) == ISC_R_SUCCESS)
  		ns_main_setmemstats(cfg_obj_asstring(obj));
  	else if (ns_g_memstatistics)
  		ns_main_setmemstats("named.memstats");
  	else
  		ns_main_setmemstats(NULL);
  
  	obj = NULL;
  	result = ns_config_get(maps, "statistics-file", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	CHECKM(setstring(server, &server->statsfile, cfg_obj_asstring(obj)),
  	       "strdup");
  
  	obj = NULL;
  	result = ns_config_get(maps, "dump-file", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	CHECKM(setstring(server, &server->dumpfile, cfg_obj_asstring(obj)),
  	       "strdup");
  
  	obj = NULL;
  	result = ns_config_get(maps, "secroots-file", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	CHECKM(setstring(server, &server->secrootsfile, cfg_obj_asstring(obj)),
  	       "strdup");
  
  	obj = NULL;
  	result = ns_config_get(maps, "recursing-file", &obj);
  	INSIST(result == ISC_R_SUCCESS);
  	CHECKM(setstring(server, &server->recfile, cfg_obj_asstring(obj)),
  	       "strdup");
  
  	obj = NULL;
  	result = ns_config_get(maps, "version", &obj);
  	if (result == ISC_R_SUCCESS) {
  		CHECKM(setoptstring(server, &server->version, obj), "strdup");
  		server->version_set = ISC_TRUE;
  	} else {
  		server->version_set = ISC_FALSE;
  	}
  
  	obj = NULL;
  	result = ns_config_get(maps, "hostname", &obj);
  	if (result == ISC_R_SUCCESS) {
  		CHECKM(setoptstring(server, &server->hostname, obj), "strdup");
  		server->hostname_set = ISC_TRUE;
  	} else {
  		server->hostname_set = ISC_FALSE;
  	}
  
  	obj = NULL;
  	result = ns_config_get(maps, "server-id", &obj);
  	server->server_usehostname = ISC_FALSE;
  	if (result == ISC_R_SUCCESS && cfg_obj_isboolean(obj)) {
  		/* The parser translates "hostname" to ISC_TRUE */
  		server->server_usehostname = cfg_obj_asboolean(obj);
  		result = setstring(server, &server->server_id, NULL);
  		RUNTIME_CHECK(result == ISC_R_SUCCESS);
  	} else if (result == ISC_R_SUCCESS) {
  		/* Found a quoted string */
  		CHECKM(setoptstring(server, &server->server_id, obj), "strdup");
  	} else {
  		result = setstring(server, &server->server_id, NULL);
  		RUNTIME_CHECK(result == ISC_R_SUCCESS);
  	}
  
  	obj = NULL;
  	result = ns_config_get(maps, "flush-zones-on-shutdown", &obj);
  	if (result == ISC_R_SUCCESS) {
  		server->flushonshutdown = cfg_obj_asboolean(obj);
  	} else {
  		server->flushonshutdown = ISC_FALSE;
  	}
  
  	result = ISC_R_SUCCESS;
  
   cleanup:
  	if (v4portset != NULL)
  		isc_portset_destroy(ns_g_mctx, &v4portset);
  
  	if (v6portset != NULL)
  		isc_portset_destroy(ns_g_mctx, &v6portset);
  
  	if (conf_parser != NULL) {
  		if (config != NULL)
  			cfg_obj_destroy(conf_parser, &config);
  		cfg_parser_destroy(&conf_parser);
  	}
  
  	if (bindkeys_parser != NULL) {
  		if (bindkeys  != NULL)
  			cfg_obj_destroy(bindkeys_parser, &bindkeys);
  		cfg_parser_destroy(&bindkeys_parser);
  	}
  
  	if (view != NULL)
  		dns_view_detach(&view);
  
  	/*
  	 * This cleans up either the old production view list
  	 * or our temporary list depending on whether they
  	 * were swapped above or not.
  	 */
  	for (view = ISC_LIST_HEAD(viewlist);
  	     view != NULL;
  	     view = view_next) {
  		view_next = ISC_LIST_NEXT(view, link);
  		ISC_LIST_UNLINK(viewlist, view, link);
  		if (result == ISC_R_SUCCESS &&
  		    strcmp(view->name, "_bind") != 0)
  			(void)dns_zt_apply(view->zonetable, ISC_FALSE,
  					   removed, view);
  		dns_view_detach(&view);
  	}
  
  	/* Same cleanup for cache list. */
  	while ((nsc = ISC_LIST_HEAD(cachelist)) != NULL) {
  		ISC_LIST_UNLINK(cachelist, nsc, link);
  		dns_cache_detach(&nsc->cache);
  		isc_mem_put(server->mctx, nsc, sizeof(*nsc));
  	}
  
  	/*
  	 * Adjust the listening interfaces in accordance with the source
  	 * addresses specified in views and zones.
  	 */
  	if (isc_net_probeipv6() == ISC_R_SUCCESS)
  		adjust_interfaces(server, ns_g_mctx);
  
  	/* Relinquish exclusive access to configuration data. */
  	if (exclusive)
  		isc_task_endexclusive(server->task);
  
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
  		      ISC_LOG_DEBUG(1), "load_configuration: %s",
  		      isc_result_totext(result));
  
  	return (result);
  }
  
  static isc_result_t
  view_loaded(void *arg) {
  	isc_result_t result;
  	ns_zoneload_t *zl = (ns_zoneload_t *) arg;
  	ns_server_t *server = zl->server;
  	unsigned int refs;
  
  
  	/*
  	 * Force zone maintenance.  Do this after loading
  	 * so that we know when we need to force AXFR of
  	 * slave zones whose master files are missing.
  	 *
  	 * We use the zoneload reference counter to let us
  	 * know when all views are finished.
  	 */
  	isc_refcount_decrement(&zl->refs, &refs);
  	if (refs != 0)
  		return (ISC_R_SUCCESS);
  
  	isc_refcount_destroy(&zl->refs);
  	isc_mem_put(server->mctx, zl, sizeof (*zl));
  
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
  		      ISC_LOG_NOTICE, "all zones loaded");
  	CHECKFATAL(dns_zonemgr_forcemaint(server->zonemgr),
  		   "forcing zone maintenance");
  
  	ns_os_started();
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
  		      ISC_LOG_NOTICE, "running");
  
  	return (ISC_R_SUCCESS);
  }
  
  static isc_result_t
  load_zones(ns_server_t *server) {
  	isc_result_t result;
  	dns_view_t *view;
  	ns_zoneload_t *zl;
  	unsigned int refs = 0;
  
  	zl = isc_mem_get(server->mctx, sizeof (*zl));
  	if (zl == NULL)
  		return (ISC_R_NOMEMORY);
  	zl->server = server;
  
  	result = isc_task_beginexclusive(server->task);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  
  	isc_refcount_init(&zl->refs, 1);
  
  	/*
  	 * Schedule zones to be loaded from disk.
  	 */
  	for (view = ISC_LIST_HEAD(server->viewlist);
  	     view != NULL;
  	     view = ISC_LIST_NEXT(view, link))
  	{
  		if (view->managed_keys != NULL) {
  			result = dns_zone_load(view->managed_keys);
  			if (result != ISC_R_SUCCESS && result != DNS_R_UPTODATE)
  				goto cleanup;
  		}
  		if (view->redirect != NULL) {
  			result = dns_zone_load(view->redirect);
  			if (result != ISC_R_SUCCESS && result != DNS_R_UPTODATE)
  				goto cleanup;
  		}
  
  		/*
  		 * 'dns_view_asyncload' calls view_loaded if there are no
  		 * zones.
  		 */
  		isc_refcount_increment(&zl->refs, NULL);
  		CHECK(dns_view_asyncload(view, view_loaded, zl));
  	}
  
   cleanup:
  	isc_refcount_decrement(&zl->refs, &refs);
  	if (refs == 0) {
  		isc_refcount_destroy(&zl->refs);
  		isc_mem_put(server->mctx, zl, sizeof (*zl));
  	} else {
  		/*
  		 * Place the task manager into privileged mode.  This
  		 * ensures that after we leave task-exclusive mode, no
  		 * other tasks will be able to run except for the ones
  		 * that are loading zones.
  		 */
  		isc_taskmgr_setmode(ns_g_taskmgr, isc_taskmgrmode_privileged);
  	}
  
  	isc_task_endexclusive(server->task);
  	return (result);
  }
  
  static isc_result_t
  load_new_zones(ns_server_t *server, isc_boolean_t stop) {
  	isc_result_t result;
  	dns_view_t *view;
  
  	result = isc_task_beginexclusive(server->task);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  
  	/*
  	 * Load zone data from disk.
  	 */
  	for (view = ISC_LIST_HEAD(server->viewlist);
  	     view != NULL;
  	     view = ISC_LIST_NEXT(view, link))
  	{
  		CHECK(dns_view_loadnew(view, stop));
  
  		/* Load managed-keys data */
  		if (view->managed_keys != NULL)
  			CHECK(dns_zone_loadnew(view->managed_keys));
  		if (view->redirect != NULL)
  			CHECK(dns_zone_loadnew(view->redirect));
  	}
  
  	/*
  	 * Resume zone XFRs.
  	 */
  	dns_zonemgr_resumexfrs(server->zonemgr);
   cleanup:
  	isc_task_endexclusive(server->task);
  	return (result);
  }
  
  static void
  run_server(isc_task_t *task, isc_event_t *event) {
  	isc_result_t result;
  	ns_server_t *server = (ns_server_t *)event->ev_arg;
  
  	INSIST(task == server->task);
  
  	isc_event_free(&event);
  
  	CHECKFATAL(dns_dispatchmgr_create(ns_g_mctx, ns_g_entropy,
  					  &ns_g_dispatchmgr),
  		   "creating dispatch manager");
  
  	dns_dispatchmgr_setstats(ns_g_dispatchmgr, server->resolverstats);
  
  	CHECKFATAL(ns_interfacemgr_create(ns_g_mctx, ns_g_taskmgr,
  					  ns_g_socketmgr, ns_g_dispatchmgr,
  					  &server->interfacemgr),
  		   "creating interface manager");
  
  	CHECKFATAL(isc_timer_create(ns_g_timermgr, isc_timertype_inactive,
  				    NULL, NULL, server->task,
  				    interface_timer_tick,
  				    server, &server->interface_timer),
  		   "creating interface timer");
  
  	CHECKFATAL(isc_timer_create(ns_g_timermgr, isc_timertype_inactive,
  				    NULL, NULL, server->task,
  				    heartbeat_timer_tick,
  				    server, &server->heartbeat_timer),
  		   "creating heartbeat timer");
  
  	CHECKFATAL(isc_timer_create(ns_g_timermgr, isc_timertype_inactive,
  				    NULL, NULL, server->task, pps_timer_tick,
  				    server, &server->pps_timer),
  		   "creating pps timer");
  
  	CHECKFATAL(cfg_parser_create(ns_g_mctx, NULL, &ns_g_parser),
  		   "creating default configuration parser");
  
  	if (ns_g_lwresdonly)
  		CHECKFATAL(load_configuration(lwresd_g_conffile, server,
  					      ISC_TRUE),
  			   "loading configuration");
  	else
  		CHECKFATAL(load_configuration(ns_g_conffile, server, ISC_TRUE),
  			   "loading configuration");
  
  	isc_hash_init();
  
  	CHECKFATAL(load_zones(server), "loading zones");
  }
  
  void
  ns_server_flushonshutdown(ns_server_t *server, isc_boolean_t flush) {
  
  	REQUIRE(NS_SERVER_VALID(server));
  
  	server->flushonshutdown = flush;
  }
  
  static void
  shutdown_server(isc_task_t *task, isc_event_t *event) {
  	isc_result_t result;
  	dns_view_t *view, *view_next;
  	ns_server_t *server = (ns_server_t *)event->ev_arg;
  	isc_boolean_t flush = server->flushonshutdown;
  	ns_cache_t *nsc;
  
  	UNUSED(task);
  	INSIST(task == server->task);
  
  	result = isc_task_beginexclusive(server->task);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
  		      ISC_LOG_INFO, "shutting down%s",
  		      flush ? ": flushing changes" : "");
  
  	ns_statschannels_shutdown(server);
  	ns_controls_shutdown(server->controls);
  	end_reserved_dispatches(server, ISC_TRUE);
  	cleanup_session_key(server, server->mctx);
  
  	if (ns_g_aclconfctx != NULL)
  		cfg_aclconfctx_detach(&ns_g_aclconfctx);
  
  	cfg_obj_destroy(ns_g_parser, &ns_g_config);
  	cfg_parser_destroy(&ns_g_parser);
  
  	for (view = ISC_LIST_HEAD(server->viewlist);
  	     view != NULL;
  	     view = view_next) {
  		view_next = ISC_LIST_NEXT(view, link);
  		ISC_LIST_UNLINK(server->viewlist, view, link);
  		if (flush)
  			dns_view_flushanddetach(&view);
  		else
  			dns_view_detach(&view);
  	}
  
  	while ((nsc = ISC_LIST_HEAD(server->cachelist)) != NULL) {
  		ISC_LIST_UNLINK(server->cachelist, nsc, link);
  		dns_cache_detach(&nsc->cache);
  		isc_mem_put(server->mctx, nsc, sizeof(*nsc));
  	}
  
  	isc_timer_detach(&server->interface_timer);
  	isc_timer_detach(&server->heartbeat_timer);
  	isc_timer_detach(&server->pps_timer);
  
  	ns_interfacemgr_shutdown(server->interfacemgr);
  	ns_interfacemgr_detach(&server->interfacemgr);
  
  	dns_dispatchmgr_destroy(&ns_g_dispatchmgr);
  
  	dns_zonemgr_shutdown(server->zonemgr);
  
  	if (ns_g_sessionkey != NULL) {
  		dns_tsigkey_detach(&ns_g_sessionkey);
  		dns_name_free(&ns_g_sessionkeyname, server->mctx);
  	}
  
  	if (server->blackholeacl != NULL)
  		dns_acl_detach(&server->blackholeacl);
  
  	dns_db_detach(&server->in_roothints);
  
  	isc_task_endexclusive(server->task);
  
  	isc_task_detach(&server->task);
  
  	isc_event_free(&event);
  }
  
  void
  ns_server_create(isc_mem_t *mctx, ns_server_t **serverp) {
  	isc_result_t result;
  	ns_server_t *server = isc_mem_get(mctx, sizeof(*server));
  
  	if (server == NULL)
  		fatal("allocating server object", ISC_R_NOMEMORY);
  
  	server->mctx = mctx;
  	server->task = NULL;
  
  	/* Initialize configuration data with default values. */
  
  	result = isc_quota_init(&server->xfroutquota, 10);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  	result = isc_quota_init(&server->tcpquota, 10);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  	result = isc_quota_init(&server->recursionquota, 100);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  
  	result = dns_aclenv_init(mctx, &server->aclenv);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  
  	/* Initialize server data structures. */
  	server->zonemgr = NULL;
  	server->interfacemgr = NULL;
  	ISC_LIST_INIT(server->viewlist);
  	server->in_roothints = NULL;
  	server->blackholeacl = NULL;
  
  	CHECKFATAL(dns_rootns_create(mctx, dns_rdataclass_in, NULL,
  				     &server->in_roothints),
  		   "setting up root hints");
  
  	CHECKFATAL(isc_mutex_init(&server->reload_event_lock),
  		   "initializing reload event lock");
  	server->reload_event =
  		isc_event_allocate(ns_g_mctx, server,
  				   NS_EVENT_RELOAD,
  				   ns_server_reload,
  				   server,
  				   sizeof(isc_event_t));
  	CHECKFATAL(server->reload_event == NULL ?
  		   ISC_R_NOMEMORY : ISC_R_SUCCESS,
  		   "allocating reload event");
  
  	CHECKFATAL(dst_lib_init2(ns_g_mctx, ns_g_entropy,
  				 ns_g_engine, ISC_ENTROPY_GOODONLY),
  		   "initializing DST");
  
  	server->tkeyctx = NULL;
  	CHECKFATAL(dns_tkeyctx_create(ns_g_mctx, ns_g_entropy,
  				      &server->tkeyctx),
  		   "creating TKEY context");
  
  	/*
  	 * Setup the server task, which is responsible for coordinating
  	 * startup and shutdown of the server, as well as all exclusive
  	 * tasks.
  	 */
  	CHECKFATAL(isc_task_create(ns_g_taskmgr, 0, &server->task),
  		   "creating server task");
  	isc_task_setname(server->task, "server", server);
  	isc_taskmgr_setexcltask(ns_g_taskmgr, server->task);
  	CHECKFATAL(isc_task_onshutdown(server->task, shutdown_server, server),
  		   "isc_task_onshutdown");
  	CHECKFATAL(isc_app_onrun(ns_g_mctx, server->task, run_server, server),
  		   "isc_app_onrun");
  
  	server->interface_timer = NULL;
  	server->heartbeat_timer = NULL;
  	server->pps_timer = NULL;
  
  	server->interface_interval = 0;
  	server->heartbeat_interval = 0;
  
  	CHECKFATAL(dns_zonemgr_create(ns_g_mctx, ns_g_taskmgr, ns_g_timermgr,
  				      ns_g_socketmgr, &server->zonemgr),
  		   "dns_zonemgr_create");
  	CHECKFATAL(dns_zonemgr_setsize(server->zonemgr, 1000),
  		   "dns_zonemgr_setsize");
  
  	server->statsfile = isc_mem_strdup(server->mctx, "named.stats");
  	CHECKFATAL(server->statsfile == NULL ? ISC_R_NOMEMORY : ISC_R_SUCCESS,
  		   "isc_mem_strdup");
  	server->nsstats = NULL;
  	server->rcvquerystats = NULL;
  	server->opcodestats = NULL;
  	server->zonestats = NULL;
  	server->resolverstats = NULL;
  	server->sockstats = NULL;
  	CHECKFATAL(isc_stats_create(server->mctx, &server->sockstats,
  				    isc_sockstatscounter_max),
  		   "isc_stats_create");
  	isc_socketmgr_setstats(ns_g_socketmgr, server->sockstats);
  
  	server->bindkeysfile = isc_mem_strdup(server->mctx, "bind.keys");
  	CHECKFATAL(server->bindkeysfile == NULL ? ISC_R_NOMEMORY :
  						  ISC_R_SUCCESS,
  		   "isc_mem_strdup");
  
  	server->dumpfile = isc_mem_strdup(server->mctx, "named_dump.db");
  	CHECKFATAL(server->dumpfile == NULL ? ISC_R_NOMEMORY : ISC_R_SUCCESS,
  		   "isc_mem_strdup");
  
  	server->secrootsfile = isc_mem_strdup(server->mctx, "named.secroots");
  	CHECKFATAL(server->secrootsfile == NULL ? ISC_R_NOMEMORY :
  						  ISC_R_SUCCESS,
  		   "isc_mem_strdup");
  
  	server->recfile = isc_mem_strdup(server->mctx, "named.recursing");
  	CHECKFATAL(server->recfile == NULL ? ISC_R_NOMEMORY : ISC_R_SUCCESS,
  		   "isc_mem_strdup");
  
  	server->hostname_set = ISC_FALSE;
  	server->hostname = NULL;
  	server->version_set = ISC_FALSE;
  	server->version = NULL;
  	server->server_usehostname = ISC_FALSE;
  	server->server_id = NULL;
  
  	CHECKFATAL(isc_stats_create(ns_g_mctx, &server->nsstats,
  				    dns_nsstatscounter_max),
  		   "dns_stats_create (server)");
  
  	CHECKFATAL(dns_rdatatypestats_create(ns_g_mctx,
  					     &server->rcvquerystats),
  		   "dns_stats_create (rcvquery)");
  
  	CHECKFATAL(dns_opcodestats_create(ns_g_mctx, &server->opcodestats),
  		   "dns_stats_create (opcode)");
  
  	CHECKFATAL(isc_stats_create(ns_g_mctx, &server->zonestats,
  				    dns_zonestatscounter_max),
  		   "dns_stats_create (zone)");
  
  	CHECKFATAL(isc_stats_create(ns_g_mctx, &server->resolverstats,
  				    dns_resstatscounter_max),
  		   "dns_stats_create (resolver)");
  
  	server->flushonshutdown = ISC_FALSE;
  	server->log_queries = ISC_FALSE;
  
  	server->controls = NULL;
  	CHECKFATAL(ns_controls_create(server, &server->controls),
  		   "ns_controls_create");
  	server->dispatchgen = 0;
  	ISC_LIST_INIT(server->dispatches);
  
  	ISC_LIST_INIT(server->statschannels);
  
  	ISC_LIST_INIT(server->cachelist);
  
  	server->sessionkey = NULL;
  	server->session_keyfile = NULL;
  	server->session_keyname = NULL;
  	server->session_keyalg = DST_ALG_UNKNOWN;
  	server->session_keybits = 0;
  
  	server->magic = NS_SERVER_MAGIC;
  	*serverp = server;
  }
  
  void
  ns_server_destroy(ns_server_t **serverp) {
  	ns_server_t *server = *serverp;
  	REQUIRE(NS_SERVER_VALID(server));
  
  	ns_controls_destroy(&server->controls);
  
  	isc_stats_detach(&server->nsstats);
  	dns_stats_detach(&server->rcvquerystats);
  	dns_stats_detach(&server->opcodestats);
  	isc_stats_detach(&server->zonestats);
  	isc_stats_detach(&server->resolverstats);
  	isc_stats_detach(&server->sockstats);
  
  	isc_mem_free(server->mctx, server->statsfile);
  	isc_mem_free(server->mctx, server->bindkeysfile);
  	isc_mem_free(server->mctx, server->dumpfile);
  	isc_mem_free(server->mctx, server->secrootsfile);
  	isc_mem_free(server->mctx, server->recfile);
  
  	if (server->version != NULL)
  		isc_mem_free(server->mctx, server->version);
  	if (server->hostname != NULL)
  		isc_mem_free(server->mctx, server->hostname);
  	if (server->server_id != NULL)
  		isc_mem_free(server->mctx, server->server_id);
  
  	if (server->zonemgr != NULL)
  		dns_zonemgr_detach(&server->zonemgr);
  
  	if (server->tkeyctx != NULL)
  		dns_tkeyctx_destroy(&server->tkeyctx);
  
  	dst_lib_destroy();
  
  	isc_event_free(&server->reload_event);
  
  	INSIST(ISC_LIST_EMPTY(server->viewlist));
  	INSIST(ISC_LIST_EMPTY(server->cachelist));
  
  	dns_aclenv_destroy(&server->aclenv);
  
  	isc_quota_destroy(&server->recursionquota);
  	isc_quota_destroy(&server->tcpquota);
  	isc_quota_destroy(&server->xfroutquota);
  
  	server->magic = 0;
  	isc_mem_put(server->mctx, server, sizeof(*server));
  	*serverp = NULL;
  }
  
  static void
  fatal(const char *msg, isc_result_t result) {
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
  		      ISC_LOG_CRITICAL, "%s: %s", msg,
  		      isc_result_totext(result));
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
  		      ISC_LOG_CRITICAL, "exiting (due to fatal error)");
  	exit(1);
  }
  
  static void
  start_reserved_dispatches(ns_server_t *server) {
  
  	REQUIRE(NS_SERVER_VALID(server));
  
  	server->dispatchgen++;
  }
  
  static void
  end_reserved_dispatches(ns_server_t *server, isc_boolean_t all) {
  	ns_dispatch_t *dispatch, *nextdispatch;
  
  	REQUIRE(NS_SERVER_VALID(server));
  
  	for (dispatch = ISC_LIST_HEAD(server->dispatches);
  	     dispatch != NULL;
  	     dispatch = nextdispatch) {
  		nextdispatch = ISC_LIST_NEXT(dispatch, link);
  		if (!all && server->dispatchgen == dispatch-> dispatchgen)
  			continue;
  		ISC_LIST_UNLINK(server->dispatches, dispatch, link);
  		dns_dispatch_detach(&dispatch->dispatch);
  		isc_mem_put(server->mctx, dispatch, sizeof(*dispatch));
  	}
  }
  
  void
  ns_add_reserved_dispatch(ns_server_t *server, const isc_sockaddr_t *addr) {
  	ns_dispatch_t *dispatch;
  	in_port_t port;
  	char addrbuf[ISC_SOCKADDR_FORMATSIZE];
  	isc_result_t result;
  	unsigned int attrs, attrmask;
  
  	REQUIRE(NS_SERVER_VALID(server));
  
  	port = isc_sockaddr_getport(addr);
  	if (port == 0 || port >= 1024)
  		return;
  
  	for (dispatch = ISC_LIST_HEAD(server->dispatches);
  	     dispatch != NULL;
  	     dispatch = ISC_LIST_NEXT(dispatch, link)) {
  		if (isc_sockaddr_equal(&dispatch->addr, addr))
  			break;
  	}
  	if (dispatch != NULL) {
  		dispatch->dispatchgen = server->dispatchgen;
  		return;
  	}
  
  	dispatch = isc_mem_get(server->mctx, sizeof(*dispatch));
  	if (dispatch == NULL) {
  		result = ISC_R_NOMEMORY;
  		goto cleanup;
  	}
  
  	dispatch->addr = *addr;
  	dispatch->dispatchgen = server->dispatchgen;
  	dispatch->dispatch = NULL;
  
  	attrs = 0;
  	attrs |= DNS_DISPATCHATTR_UDP;
  	switch (isc_sockaddr_pf(addr)) {
  	case AF_INET:
  		attrs |= DNS_DISPATCHATTR_IPV4;
  		break;
  	case AF_INET6:
  		attrs |= DNS_DISPATCHATTR_IPV6;
  		break;
  	default:
  		result = ISC_R_NOTIMPLEMENTED;
  		goto cleanup;
  	}
  	attrmask = 0;
  	attrmask |= DNS_DISPATCHATTR_UDP;
  	attrmask |= DNS_DISPATCHATTR_TCP;
  	attrmask |= DNS_DISPATCHATTR_IPV4;
  	attrmask |= DNS_DISPATCHATTR_IPV6;
  
  	result = dns_dispatch_getudp(ns_g_dispatchmgr, ns_g_socketmgr,
  				     ns_g_taskmgr, &dispatch->addr, 4096,
  				     1000, 32768, 16411, 16433,
  				     attrs, attrmask, &dispatch->dispatch);
  	if (result != ISC_R_SUCCESS)
  		goto cleanup;
  
  	ISC_LIST_INITANDPREPEND(server->dispatches, dispatch, link);
  
  	return;
  
   cleanup:
  	if (dispatch != NULL)
  		isc_mem_put(server->mctx, dispatch, sizeof(*dispatch));
  	isc_sockaddr_format(addr, addrbuf, sizeof(addrbuf));
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  		      NS_LOGMODULE_SERVER, ISC_LOG_WARNING,
  		      "unable to create dispatch for reserved port %s: %s",
  		      addrbuf, isc_result_totext(result));
  }
  
  
  static isc_result_t
  loadconfig(ns_server_t *server) {
  	isc_result_t result;
  	start_reserved_dispatches(server);
  	result = load_configuration(ns_g_lwresdonly ?
  				    lwresd_g_conffile : ns_g_conffile,
  				    server, ISC_FALSE);
  	if (result == ISC_R_SUCCESS) {
  		end_reserved_dispatches(server, ISC_FALSE);
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "reloading configuration succeeded");
  	} else {
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  			      "reloading configuration failed: %s",
  			      isc_result_totext(result));
  	}
  	return (result);
  }
  
  static isc_result_t
  reload(ns_server_t *server) {
  	isc_result_t result;
  	CHECK(loadconfig(server));
  
  	result = load_zones(server);
  	if (result == ISC_R_SUCCESS)
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "reloading zones succeeded");
  	else
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  			      "reloading zones failed: %s",
  			      isc_result_totext(result));
  
   cleanup:
  	return (result);
  }
  
  static void
  reconfig(ns_server_t *server) {
  	isc_result_t result;
  	CHECK(loadconfig(server));
  
  	result = load_new_zones(server, ISC_FALSE);
  	if (result == ISC_R_SUCCESS)
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "any newly configured zones are now loaded");
  	else
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  			      "loading new zones failed: %s",
  			      isc_result_totext(result));
  
   cleanup: ;
  }
  
  /*
   * Handle a reload event (from SIGHUP).
   */
  static void
  ns_server_reload(isc_task_t *task, isc_event_t *event) {
  	ns_server_t *server = (ns_server_t *)event->ev_arg;
  
  	INSIST(task = server->task);
  	UNUSED(task);
  
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  		      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  		      "received SIGHUP or SIGUSR1 signal to reload zones");
  	(void)reload(server);
  
  	LOCK(&server->reload_event_lock);
  	INSIST(server->reload_event == NULL);
  	server->reload_event = event;
  	UNLOCK(&server->reload_event_lock);
  }
  
  void
  ns_server_reloadwanted(ns_server_t *server) {
  	LOCK(&server->reload_event_lock);
  	if (server->reload_event != NULL)
  		isc_task_send(server->task, &server->reload_event);
  	UNLOCK(&server->reload_event_lock);
  }
  
  static char *
  next_token(char **stringp, const char *delim) {
  	char *res;
  
  	do {
  		res = strsep(stringp, delim);
  		if (res == NULL)
  			break;
  	} while (*res == '\0');
  	return (res);
  }
  
  /*
   * Find the zone specified in the control channel command 'args',
   * if any.  If a zone is specified, point '*zonep' at it, otherwise
   * set '*zonep' to NULL.
   */
  static isc_result_t
  zone_from_args(ns_server_t *server, char *args, const char *zonetxt,
  	       dns_zone_t **zonep, const char **zonename, isc_boolean_t skip)
  {
  	char *input, *ptr;
  	char *classtxt;
  	const char *viewtxt = NULL;
  	dns_fixedname_t name;
  	isc_result_t result;
  	isc_buffer_t buf;
  	dns_view_t *view = NULL;
  	dns_rdataclass_t rdclass;
  
  	REQUIRE(zonep != NULL && *zonep == NULL);
  
  	input = args;
  
  	if (skip) {
  		/* Skip the command name. */
  		ptr = next_token(&input, " \t");
  		if (ptr == NULL)
  			return (ISC_R_UNEXPECTEDEND);
  	}
  
  	/* Look for the zone name. */
  	if (zonetxt == NULL)
  		zonetxt = next_token(&input, " \t");
  	if (zonetxt == NULL)
  		return (ISC_R_SUCCESS);
  	if (zonename)
  		*zonename = zonetxt;
  
  	/* Look for the optional class name. */
  	classtxt = next_token(&input, " \t");
  	if (classtxt != NULL) {
  		/* Look for the optional view name. */
  		viewtxt = next_token(&input, " \t");
  	}
  
  	isc_buffer_init(&buf, zonetxt, strlen(zonetxt));
  	isc_buffer_add(&buf, strlen(zonetxt));
  	dns_fixedname_init(&name);
  	result = dns_name_fromtext(dns_fixedname_name(&name),
  				   &buf, dns_rootname, 0, NULL);
  	if (result != ISC_R_SUCCESS)
  		goto fail1;
  
  	if (classtxt != NULL) {
  		isc_textregion_t r;
  		r.base = classtxt;
  		r.length = strlen(classtxt);
  		result = dns_rdataclass_fromtext(&rdclass, &r);
  		if (result != ISC_R_SUCCESS)
  			goto fail1;
  	} else
  		rdclass = dns_rdataclass_in;
  
  	if (viewtxt == NULL) {
  		result = dns_viewlist_findzone(&server->viewlist,
  					       dns_fixedname_name(&name),
  					       ISC_TF(classtxt == NULL),
  					       rdclass, zonep);
  	} else {
  		result = dns_viewlist_find(&server->viewlist, viewtxt,
  					   rdclass, &view);
  		if (result != ISC_R_SUCCESS)
  			goto fail1;
  
  		result = dns_zt_find(view->zonetable, dns_fixedname_name(&name),
  				     0, NULL, zonep);
  		dns_view_detach(&view);
  	}
  
  	/* Partial match? */
  	if (result != ISC_R_SUCCESS && *zonep != NULL)
  		dns_zone_detach(zonep);
  	if (result == DNS_R_PARTIALMATCH)
  		result = ISC_R_NOTFOUND;
   fail1:
  	return (result);
  }
  
  /*
   * Act on a "retransfer" command from the command channel.
   */
  isc_result_t
  ns_server_retransfercommand(ns_server_t *server, char *args) {
  	isc_result_t result;
  	dns_zone_t *zone = NULL;
  	dns_zone_t *raw = NULL;
  	dns_zonetype_t type;
  
  	result = zone_from_args(server, args, NULL, &zone, NULL, ISC_TRUE);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  	if (zone == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  	dns_zone_getraw(zone, &raw);
  	if (raw != NULL) {
  		dns_zone_detach(&zone);
  		dns_zone_attach(raw, &zone);
  		dns_zone_detach(&raw);
  	}
  	type = dns_zone_gettype(zone);
  	if (type == dns_zone_slave || type == dns_zone_stub)
  		dns_zone_forcereload(zone);
  	else
  		result = ISC_R_NOTFOUND;
  	dns_zone_detach(&zone);
  	return (result);
  }
  
  /*
   * Act on a "reload" command from the command channel.
   */
  isc_result_t
  ns_server_reloadcommand(ns_server_t *server, char *args, isc_buffer_t *text) {
  	isc_result_t result;
  	dns_zone_t *zone = NULL;
  	dns_zonetype_t type;
  	const char *msg = NULL;
  
  	result = zone_from_args(server, args, NULL, &zone, NULL, ISC_TRUE);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  	if (zone == NULL) {
  		result = reload(server);
  		if (result == ISC_R_SUCCESS)
  			msg = "server reload successful";
  	} else {
  		type = dns_zone_gettype(zone);
  		if (type == dns_zone_slave || type == dns_zone_stub) {
  			dns_zone_refresh(zone);
  			dns_zone_detach(&zone);
  			msg = "zone refresh queued";
  		} else {
  			result = dns_zone_load(zone);
  			dns_zone_detach(&zone);
  			switch (result) {
  			case ISC_R_SUCCESS:
  				 msg = "zone reload successful";
  				 break;
  			case DNS_R_CONTINUE:
  				msg = "zone reload queued";
  				result = ISC_R_SUCCESS;
  				break;
  			case DNS_R_UPTODATE:
  				msg = "zone reload up-to-date";
  				result = ISC_R_SUCCESS;
  				break;
  			default:
  				/* failure message will be generated by rndc */
  				break;
  			}
  		}
  	}
  	if (msg != NULL && strlen(msg) < isc_buffer_availablelength(text))
  		isc_buffer_putmem(text, (const unsigned char *)msg,
  				  strlen(msg) + 1);
  	return (result);
  }
  
  /*
   * Act on a "reconfig" command from the command channel.
   */
  isc_result_t
  ns_server_reconfigcommand(ns_server_t *server, char *args) {
  	UNUSED(args);
  
  	reconfig(server);
  	return (ISC_R_SUCCESS);
  }
  
  /*
   * Act on a "notify" command from the command channel.
   */
  isc_result_t
  ns_server_notifycommand(ns_server_t *server, char *args, isc_buffer_t *text) {
  	isc_result_t result;
  	dns_zone_t *zone = NULL;
  	const unsigned char msg[] = "zone notify queued";
  
  	result = zone_from_args(server, args, NULL, &zone, NULL, ISC_TRUE);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  	if (zone == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  
  	dns_zone_notify(zone);
  	dns_zone_detach(&zone);
  	if (sizeof(msg) <= isc_buffer_availablelength(text))
  		isc_buffer_putmem(text, msg, sizeof(msg));
  
  	return (ISC_R_SUCCESS);
  }
  
  /*
   * Act on a "refresh" command from the command channel.
   */
  isc_result_t
  ns_server_refreshcommand(ns_server_t *server, char *args, isc_buffer_t *text) {
  	isc_result_t result;
  	dns_zone_t *zone = NULL;
  	const unsigned char msg1[] = "zone refresh queued";
  	const unsigned char msg2[] = "not a slave or stub zone";
  	dns_zonetype_t type;
  
  	result = zone_from_args(server, args, NULL, &zone, NULL, ISC_TRUE);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  	if (zone == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  
  	type = dns_zone_gettype(zone);
  	if (type == dns_zone_slave || type == dns_zone_stub) {
  		dns_zone_refresh(zone);
  		dns_zone_detach(&zone);
  		if (sizeof(msg1) <= isc_buffer_availablelength(text))
  			isc_buffer_putmem(text, msg1, sizeof(msg1));
  		return (ISC_R_SUCCESS);
  	}
  
  	dns_zone_detach(&zone);
  	if (sizeof(msg2) <= isc_buffer_availablelength(text))
  		isc_buffer_putmem(text, msg2, sizeof(msg2));
  	return (ISC_R_FAILURE);
  }
  
  isc_result_t
  ns_server_togglequerylog(ns_server_t *server, char *args) {
  	isc_boolean_t value;
  	char *ptr;
  
  	/* Skip the command name. */
  	ptr = next_token(&args, " \t");
  	if (ptr == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  
  	ptr = next_token(&args, " \t");
  	if (ptr == NULL)
  		value = server->log_queries ? ISC_FALSE : ISC_TRUE;
  	else if (strcasecmp(ptr, "yes") == 0 || strcasecmp(ptr, "on") == 0)
  		value = ISC_TRUE;
  	else if (strcasecmp(ptr, "no") == 0 || strcasecmp(ptr, "off") == 0)
  		value = ISC_FALSE;
  	else
  		return (ISC_R_NOTFOUND);
  
  	if (server->log_queries == value)
  		return (ISC_R_SUCCESS);
  
  	server->log_queries = value;
  
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  		      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  		      "query logging is now %s",
  		      server->log_queries ? "on" : "off");
  	return (ISC_R_SUCCESS);
  }
  
  static isc_result_t
  ns_listenlist_fromconfig(const cfg_obj_t *listenlist, const cfg_obj_t *config,
  			 cfg_aclconfctx_t *actx,
  			 isc_mem_t *mctx, ns_listenlist_t **target)
  {
  	isc_result_t result;
  	const cfg_listelt_t *element;
  	ns_listenlist_t *dlist = NULL;
  
  	REQUIRE(target != NULL && *target == NULL);
  
  	result = ns_listenlist_create(mctx, &dlist);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	for (element = cfg_list_first(listenlist);
  	     element != NULL;
  	     element = cfg_list_next(element))
  	{
  		ns_listenelt_t *delt = NULL;
  		const cfg_obj_t *listener = cfg_listelt_value(element);
  		result = ns_listenelt_fromconfig(listener, config, actx,
  						 mctx, &delt);
  		if (result != ISC_R_SUCCESS)
  			goto cleanup;
  		ISC_LIST_APPEND(dlist->elts, delt, link);
  	}
  	*target = dlist;
  	return (ISC_R_SUCCESS);
  
   cleanup:
  	ns_listenlist_detach(&dlist);
  	return (result);
  }
  
  /*
   * Create a listen list from the corresponding configuration
   * data structure.
   */
  static isc_result_t
  ns_listenelt_fromconfig(const cfg_obj_t *listener, const cfg_obj_t *config,
  			cfg_aclconfctx_t *actx,
  			isc_mem_t *mctx, ns_listenelt_t **target)
  {
  	isc_result_t result;
  	const cfg_obj_t *portobj;
  	in_port_t port;
  	ns_listenelt_t *delt = NULL;
  	REQUIRE(target != NULL && *target == NULL);
  
  	portobj = cfg_tuple_get(listener, "port");
  	if (!cfg_obj_isuint32(portobj)) {
  		if (ns_g_port != 0) {
  			port = ns_g_port;
  		} else {
  			result = ns_config_getport(config, &port);
  			if (result != ISC_R_SUCCESS)
  				return (result);
  		}
  	} else {
  		if (cfg_obj_asuint32(portobj) >= ISC_UINT16_MAX) {
  			cfg_obj_log(portobj, ns_g_lctx, ISC_LOG_ERROR,
  				    "port value '%u' is out of range",
  				    cfg_obj_asuint32(portobj));
  			return (ISC_R_RANGE);
  		}
  		port = (in_port_t)cfg_obj_asuint32(portobj);
  	}
  
  	result = ns_listenelt_create(mctx, port, NULL, &delt);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	result = cfg_acl_fromconfig(cfg_tuple_get(listener, "acl"),
  				   config, ns_g_lctx, actx, mctx, 0,
  				   &delt->acl);
  	if (result != ISC_R_SUCCESS) {
  		ns_listenelt_destroy(delt);
  		return (result);
  	}
  	*target = delt;
  	return (ISC_R_SUCCESS);
  }
  
  isc_result_t
  ns_server_dumpstats(ns_server_t *server) {
  	isc_result_t result;
  	FILE *fp = NULL;
  
  	CHECKMF(isc_stdio_open(server->statsfile, "a", &fp),
  		"could not open statistics dump file", server->statsfile);
  
  	result = ns_stats_dump(server, fp);
  
   cleanup:
  	if (fp != NULL)
  		(void)isc_stdio_close(fp);
  	if (result == ISC_R_SUCCESS)
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "dumpstats complete");
  	else
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  			      "dumpstats failed: %s",
  			      dns_result_totext(result));
  	return (result);
  }
  
  static isc_result_t
  add_zone_tolist(dns_zone_t *zone, void *uap) {
  	struct dumpcontext *dctx = uap;
  	struct zonelistentry *zle;
  
  	zle = isc_mem_get(dctx->mctx, sizeof *zle);
  	if (zle ==  NULL)
  		return (ISC_R_NOMEMORY);
  	zle->zone = NULL;
  	dns_zone_attach(zone, &zle->zone);
  	ISC_LINK_INIT(zle, link);
  	ISC_LIST_APPEND(ISC_LIST_TAIL(dctx->viewlist)->zonelist, zle, link);
  	return (ISC_R_SUCCESS);
  }
  
  static isc_result_t
  add_view_tolist(struct dumpcontext *dctx, dns_view_t *view) {
  	struct viewlistentry *vle;
  	isc_result_t result = ISC_R_SUCCESS;
  
  	/*
  	 * Prevent duplicate views.
  	 */
  	for (vle = ISC_LIST_HEAD(dctx->viewlist);
  	     vle != NULL;
  	     vle = ISC_LIST_NEXT(vle, link))
  		if (vle->view == view)
  			return (ISC_R_SUCCESS);
  
  	vle = isc_mem_get(dctx->mctx, sizeof *vle);
  	if (vle == NULL)
  		return (ISC_R_NOMEMORY);
  	vle->view = NULL;
  	dns_view_attach(view, &vle->view);
  	ISC_LINK_INIT(vle, link);
  	ISC_LIST_INIT(vle->zonelist);
  	ISC_LIST_APPEND(dctx->viewlist, vle, link);
  	if (dctx->dumpzones)
  		result = dns_zt_apply(view->zonetable, ISC_TRUE,
  				      add_zone_tolist, dctx);
  	return (result);
  }
  
  static void
  dumpcontext_destroy(struct dumpcontext *dctx) {
  	struct viewlistentry *vle;
  	struct zonelistentry *zle;
  
  	vle = ISC_LIST_HEAD(dctx->viewlist);
  	while (vle != NULL) {
  		ISC_LIST_UNLINK(dctx->viewlist, vle, link);
  		zle = ISC_LIST_HEAD(vle->zonelist);
  		while (zle != NULL) {
  			ISC_LIST_UNLINK(vle->zonelist, zle, link);
  			dns_zone_detach(&zle->zone);
  			isc_mem_put(dctx->mctx, zle, sizeof *zle);
  			zle = ISC_LIST_HEAD(vle->zonelist);
  		}
  		dns_view_detach(&vle->view);
  		isc_mem_put(dctx->mctx, vle, sizeof *vle);
  		vle = ISC_LIST_HEAD(dctx->viewlist);
  	}
  	if (dctx->version != NULL)
  		dns_db_closeversion(dctx->db, &dctx->version, ISC_FALSE);
  	if (dctx->db != NULL)
  		dns_db_detach(&dctx->db);
  	if (dctx->cache != NULL)
  		dns_db_detach(&dctx->cache);
  	if (dctx->task != NULL)
  		isc_task_detach(&dctx->task);
  	if (dctx->fp != NULL)
  		(void)isc_stdio_close(dctx->fp);
  	if (dctx->mdctx != NULL)
  		dns_dumpctx_detach(&dctx->mdctx);
  	isc_mem_put(dctx->mctx, dctx, sizeof *dctx);
  }
  
  static void
  dumpdone(void *arg, isc_result_t result) {
  	struct dumpcontext *dctx = arg;
  	char buf[1024+32];
  	const dns_master_style_t *style;
  
  	if (result != ISC_R_SUCCESS)
  		goto cleanup;
  	if (dctx->mdctx != NULL)
  		dns_dumpctx_detach(&dctx->mdctx);
  	if (dctx->view == NULL) {
  		dctx->view = ISC_LIST_HEAD(dctx->viewlist);
  		if (dctx->view == NULL)
  			goto done;
  		INSIST(dctx->zone == NULL);
  	} else
  		goto resume;
   nextview:
  	fprintf(dctx->fp, ";\n; Start view %s\n;\n", dctx->view->view->name);
   resume:
  	if (dctx->dumpcache && dns_view_iscacheshared(dctx->view->view)) {
  		fprintf(dctx->fp,
  			";\n; Cache of view '%s' is shared as '%s'\n",
  			dctx->view->view->name,
  			dns_cache_getname(dctx->view->view->cache));
  	} else if (dctx->zone == NULL && dctx->cache == NULL &&
  		   dctx->dumpcache)
  	{
  		style = &dns_master_style_cache;
  		/* start cache dump */
  		if (dctx->view->view->cachedb != NULL)
  			dns_db_attach(dctx->view->view->cachedb, &dctx->cache);
  		if (dctx->cache != NULL) {
  			fprintf(dctx->fp,
  				";\n; Cache dump of view '%s' (cache %s)\n;\n",
  				dctx->view->view->name,
  				dns_cache_getname(dctx->view->view->cache));
  			result = dns_master_dumptostreaminc(dctx->mctx,
  							    dctx->cache, NULL,
  							    style, dctx->fp,
  							    dctx->task,
  							    dumpdone, dctx,
  							    &dctx->mdctx);
  			if (result == DNS_R_CONTINUE)
  				return;
  			if (result == ISC_R_NOTIMPLEMENTED)
  				fprintf(dctx->fp, "; %s\n",
  					dns_result_totext(result));
  			else if (result != ISC_R_SUCCESS)
  				goto cleanup;
  		}
  	}
  	if (dctx->cache != NULL) {
  		dns_adb_dump(dctx->view->view->adb, dctx->fp);
  		dns_resolver_printbadcache(dctx->view->view->resolver,
  					   dctx->fp);
  		dns_db_detach(&dctx->cache);
  	}
  	if (dctx->dumpzones) {
  		style = &dns_master_style_full;
   nextzone:
  		if (dctx->version != NULL)
  			dns_db_closeversion(dctx->db, &dctx->version,
  					    ISC_FALSE);
  		if (dctx->db != NULL)
  			dns_db_detach(&dctx->db);
  		if (dctx->zone == NULL)
  			dctx->zone = ISC_LIST_HEAD(dctx->view->zonelist);
  		else
  			dctx->zone = ISC_LIST_NEXT(dctx->zone, link);
  		if (dctx->zone != NULL) {
  			/* start zone dump */
  			dns_zone_name(dctx->zone->zone, buf, sizeof(buf));
  			fprintf(dctx->fp, ";\n; Zone dump of '%s'\n;\n", buf);
  			result = dns_zone_getdb(dctx->zone->zone, &dctx->db);
  			if (result != ISC_R_SUCCESS) {
  				fprintf(dctx->fp, "; %s\n",
  					dns_result_totext(result));
  				goto nextzone;
  			}
  			dns_db_currentversion(dctx->db, &dctx->version);
  			result = dns_master_dumptostreaminc(dctx->mctx,
  							    dctx->db,
  							    dctx->version,
  							    style, dctx->fp,
  							    dctx->task,
  							    dumpdone, dctx,
  							    &dctx->mdctx);
  			if (result == DNS_R_CONTINUE)
  				return;
  			if (result == ISC_R_NOTIMPLEMENTED) {
  				fprintf(dctx->fp, "; %s\n",
  					dns_result_totext(result));
  				result = ISC_R_SUCCESS;
  				POST(result);
  				goto nextzone;
  			}
  			if (result != ISC_R_SUCCESS)
  				goto cleanup;
  		}
  	}
  	if (dctx->view != NULL)
  		dctx->view = ISC_LIST_NEXT(dctx->view, link);
  	if (dctx->view != NULL)
  		goto nextview;
   done:
  	fprintf(dctx->fp, "; Dump complete\n");
  	result = isc_stdio_flush(dctx->fp);
  	if (result == ISC_R_SUCCESS)
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "dumpdb complete");
   cleanup:
  	if (result != ISC_R_SUCCESS)
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  			      "dumpdb failed: %s", dns_result_totext(result));
  	dumpcontext_destroy(dctx);
  }
  
  isc_result_t
  ns_server_dumpdb(ns_server_t *server, char *args) {
  	struct dumpcontext *dctx = NULL;
  	dns_view_t *view;
  	isc_result_t result;
  	char *ptr;
  	const char *sep;
  
  	/* Skip the command name. */
  	ptr = next_token(&args, " \t");
  	if (ptr == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  
  	dctx = isc_mem_get(server->mctx, sizeof(*dctx));
  	if (dctx == NULL)
  		return (ISC_R_NOMEMORY);
  
  	dctx->mctx = server->mctx;
  	dctx->dumpcache = ISC_TRUE;
  	dctx->dumpzones = ISC_FALSE;
  	dctx->fp = NULL;
  	ISC_LIST_INIT(dctx->viewlist);
  	dctx->view = NULL;
  	dctx->zone = NULL;
  	dctx->cache = NULL;
  	dctx->mdctx = NULL;
  	dctx->db = NULL;
  	dctx->cache = NULL;
  	dctx->task = NULL;
  	dctx->version = NULL;
  	isc_task_attach(server->task, &dctx->task);
  
  	CHECKMF(isc_stdio_open(server->dumpfile, "w", &dctx->fp),
  		"could not open dump file", server->dumpfile);
  
  	sep = (args == NULL) ? "" : ": ";
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  		      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  		      "dumpdb started%s%s", sep, (args != NULL) ? args : "");
  
  	ptr = next_token(&args, " \t");
  	if (ptr != NULL && strcmp(ptr, "-all") == 0) {
  		dctx->dumpzones = ISC_TRUE;
  		dctx->dumpcache = ISC_TRUE;
  		ptr = next_token(&args, " \t");
  	} else if (ptr != NULL && strcmp(ptr, "-cache") == 0) {
  		dctx->dumpzones = ISC_FALSE;
  		dctx->dumpcache = ISC_TRUE;
  		ptr = next_token(&args, " \t");
  	} else if (ptr != NULL && strcmp(ptr, "-zones") == 0) {
  		dctx->dumpzones = ISC_TRUE;
  		dctx->dumpcache = ISC_FALSE;
  		ptr = next_token(&args, " \t");
  	}
  
   nextview:
  	for (view = ISC_LIST_HEAD(server->viewlist);
  	     view != NULL;
  	     view = ISC_LIST_NEXT(view, link))
  	{
  		if (ptr != NULL && strcmp(view->name, ptr) != 0)
  			continue;
  		CHECK(add_view_tolist(dctx, view));
  	}
  	if (ptr != NULL) {
  		ptr = next_token(&args, " \t");
  		if (ptr != NULL)
  			goto nextview;
  	}
  	dumpdone(dctx, ISC_R_SUCCESS);
  	return (ISC_R_SUCCESS);
  
   cleanup:
  	if (dctx != NULL)
  		dumpcontext_destroy(dctx);
  	return (result);
  }
  
  isc_result_t
  ns_server_dumpsecroots(ns_server_t *server, char *args) {
  	dns_view_t *view;
  	dns_keytable_t *secroots = NULL;
  	isc_result_t result;
  	char *ptr;
  	FILE *fp = NULL;
  	isc_time_t now;
  	char tbuf[64];
  
  	/* Skip the command name. */
  	ptr = next_token(&args, " \t");
  	if (ptr == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  
  	ptr = next_token(&args, " \t");
  
  	CHECKMF(isc_stdio_open(server->secrootsfile, "w", &fp),
  		"could not open secroots dump file", server->secrootsfile);
  	TIME_NOW(&now);
  	isc_time_formattimestamp(&now, tbuf, sizeof(tbuf));
  	fprintf(fp, "%s\n", tbuf);
  
  	do {
  		for (view = ISC_LIST_HEAD(server->viewlist);
  		     view != NULL;
  		     view = ISC_LIST_NEXT(view, link))
  		{
  			if (ptr != NULL && strcmp(view->name, ptr) != 0)
  				continue;
  			if (secroots != NULL)
  				dns_keytable_detach(&secroots);
  			result = dns_view_getsecroots(view, &secroots);
  			if (result == ISC_R_NOTFOUND) {
  				result = ISC_R_SUCCESS;
  				continue;
  			}
  			fprintf(fp, "\n Start view %s\n\n", view->name);
  			result = dns_keytable_dump(secroots, fp);
  			if (result != ISC_R_SUCCESS)
  				fprintf(fp, " dumpsecroots failed: %s\n",
  					isc_result_totext(result));
  		}
  		if (ptr != NULL)
  			ptr = next_token(&args, " \t");
  	} while (ptr != NULL);
  
   cleanup:
  	if (secroots != NULL)
  		dns_keytable_detach(&secroots);
  	if (fp != NULL)
  		(void)isc_stdio_close(fp);
  	if (result == ISC_R_SUCCESS)
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "dumpsecroots complete");
  	else
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  			      "dumpsecroots failed: %s",
  			      dns_result_totext(result));
  	return (result);
  }
  
  isc_result_t
  ns_server_dumprecursing(ns_server_t *server) {
  	FILE *fp = NULL;
  	isc_result_t result;
  
  	CHECKMF(isc_stdio_open(server->recfile, "w", &fp),
  		"could not open dump file", server->recfile);
  	fprintf(fp,";\n; Recursing Queries\n;\n");
  	ns_interfacemgr_dumprecursing(fp, server->interfacemgr);
  	fprintf(fp, "; Dump complete\n");
  
   cleanup:
  	if (fp != NULL)
  		result = isc_stdio_close(fp);
  	if (result == ISC_R_SUCCESS)
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "dumprecursing complete");
  	else
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  			      "dumprecursing failed: %s",
  			      dns_result_totext(result));
  	return (result);
  }
  
  isc_result_t
  ns_server_setdebuglevel(ns_server_t *server, char *args) {
  	char *ptr;
  	char *levelstr;
  	char *endp;
  	long newlevel;
  
  	UNUSED(server);
  
  	/* Skip the command name. */
  	ptr = next_token(&args, " \t");
  	if (ptr == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  
  	/* Look for the new level name. */
  	levelstr = next_token(&args, " \t");
  	if (levelstr == NULL) {
  		if (ns_g_debuglevel < 99)
  			ns_g_debuglevel++;
  	} else {
  		newlevel = strtol(levelstr, &endp, 10);
  		if (*endp != '\0' || newlevel < 0 || newlevel > 99)
  			return (ISC_R_RANGE);
  		ns_g_debuglevel = (unsigned int)newlevel;
  	}
  	isc_log_setdebuglevel(ns_g_lctx, ns_g_debuglevel);
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  		      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  		      "debug level is now %d", ns_g_debuglevel);
  	return (ISC_R_SUCCESS);
  }
  
  isc_result_t
  ns_server_validation(ns_server_t *server, char *args) {
  	char *ptr, *viewname;
  	dns_view_t *view;
  	isc_boolean_t changed = ISC_FALSE;
  	isc_result_t result;
  	isc_boolean_t enable;
  
  	/* Skip the command name. */
  	ptr = next_token(&args, " \t");
  	if (ptr == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  
  	/* Find out what we are to do. */
  	ptr = next_token(&args, " \t");
  	if (ptr == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  
  	if (!strcasecmp(ptr, "on") || !strcasecmp(ptr, "yes") ||
  	    !strcasecmp(ptr, "enable") || !strcasecmp(ptr, "true"))
  		enable = ISC_TRUE;
  	else if (!strcasecmp(ptr, "off") || !strcasecmp(ptr, "no") ||
  		 !strcasecmp(ptr, "disable") || !strcasecmp(ptr, "false"))
  		enable = ISC_FALSE;
  	else
  		return (DNS_R_SYNTAX);
  
  	/* Look for the view name. */
  	viewname = next_token(&args, " \t");
  
  	result = isc_task_beginexclusive(server->task);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  	for (view = ISC_LIST_HEAD(server->viewlist);
  	     view != NULL;
  	     view = ISC_LIST_NEXT(view, link))
  	{
  		if (viewname != NULL && strcasecmp(viewname, view->name) != 0)
  			continue;
  		result = dns_view_flushcache(view);
  		if (result != ISC_R_SUCCESS)
  			goto out;
  		view->enablevalidation = enable;
  		changed = ISC_TRUE;
  	}
  	if (changed)
  		result = ISC_R_SUCCESS;
  	else
  		result = ISC_R_FAILURE;
   out:
  	isc_task_endexclusive(server->task);
  	return (result);
  }
  
  isc_result_t
  ns_server_flushcache(ns_server_t *server, char *args) {
  	char *ptr, *viewname;
  	dns_view_t *view;
  	isc_boolean_t flushed;
  	isc_boolean_t found;
  	isc_result_t result;
  	ns_cache_t *nsc;
  
  	/* Skip the command name. */
  	ptr = next_token(&args, " \t");
  	if (ptr == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  
  	/* Look for the view name. */
  	viewname = next_token(&args, " \t");
  
  	result = isc_task_beginexclusive(server->task);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  	flushed = ISC_TRUE;
  	found = ISC_FALSE;
  
  	/*
  	 * Flushing a cache is tricky when caches are shared by multiple views.
  	 * We first identify which caches should be flushed in the local cache
  	 * list, flush these caches, and then update other views that refer to
  	 * the flushed cache DB.
  	 */
  	if (viewname != NULL) {
  		/*
  		 * Mark caches that need to be flushed.  This is an O(#view^2)
  		 * operation in the very worst case, but should be normally
  		 * much more lightweight because only a few (most typically just
  		 * one) views will match.
  		 */
  		for (view = ISC_LIST_HEAD(server->viewlist);
  		     view != NULL;
  		     view = ISC_LIST_NEXT(view, link))
  		{
  			if (strcasecmp(viewname, view->name) != 0)
  				continue;
  			found = ISC_TRUE;
  			for (nsc = ISC_LIST_HEAD(server->cachelist);
  			     nsc != NULL;
  			     nsc = ISC_LIST_NEXT(nsc, link)) {
  				if (nsc->cache == view->cache)
  					break;
  			}
  			INSIST(nsc != NULL);
  			nsc->needflush = ISC_TRUE;
  		}
  	} else
  		found = ISC_TRUE;
  
  	/* Perform flush */
  	for (nsc = ISC_LIST_HEAD(server->cachelist);
  	     nsc != NULL;
  	     nsc = ISC_LIST_NEXT(nsc, link)) {
  		if (viewname != NULL && !nsc->needflush)
  			continue;
  		nsc->needflush = ISC_TRUE;
  		result = dns_view_flushcache2(nsc->primaryview, ISC_FALSE);
  		if (result != ISC_R_SUCCESS) {
  			flushed = ISC_FALSE;
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  				      "flushing cache in view '%s' failed: %s",
  				      nsc->primaryview->name,
  				      isc_result_totext(result));
  		}
  	}
  
  	/*
  	 * Fix up views that share a flushed cache: let the views update the
  	 * cache DB they're referring to.  This could also be an expensive
  	 * operation, but should typically be marginal: the inner loop is only
  	 * necessary for views that share a cache, and if there are many such
  	 * views the number of shared cache should normally be small.
  	 * A worst case is that we have n views and n/2 caches, each shared by
  	 * two views.  Then this will be a O(n^2/4) operation.
  	 */
  	for (view = ISC_LIST_HEAD(server->viewlist);
  	     view != NULL;
  	     view = ISC_LIST_NEXT(view, link))
  	{
  		if (!dns_view_iscacheshared(view))
  			continue;
  		for (nsc = ISC_LIST_HEAD(server->cachelist);
  		     nsc != NULL;
  		     nsc = ISC_LIST_NEXT(nsc, link)) {
  			if (!nsc->needflush || nsc->cache != view->cache)
  				continue;
  			result = dns_view_flushcache2(view, ISC_TRUE);
  			if (result != ISC_R_SUCCESS) {
  				flushed = ISC_FALSE;
  				isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  					      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  					      "fixing cache in view '%s' "
  					      "failed: %s", view->name,
  					      isc_result_totext(result));
  			}
  		}
  	}
  
  	/* Cleanup the cache list. */
  	for (nsc = ISC_LIST_HEAD(server->cachelist);
  	     nsc != NULL;
  	     nsc = ISC_LIST_NEXT(nsc, link)) {
  		nsc->needflush = ISC_FALSE;
  	}
  
  	if (flushed && found) {
  		if (viewname != NULL)
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  				      "flushing cache in view '%s' succeeded",
  				      viewname);
  		else
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  				      "flushing caches in all views succeeded");
  		result = ISC_R_SUCCESS;
  	} else {
  		if (!found) {
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  				      "flushing cache in view '%s' failed: "
  				      "view not found", viewname);
  			result = ISC_R_NOTFOUND;
  		} else
  			result = ISC_R_FAILURE;
  	}
  	isc_task_endexclusive(server->task);
  	return (result);
  }
  
  isc_result_t
  ns_server_flushnode(ns_server_t *server, char *args, isc_boolean_t tree) {
  	char *ptr, *target, *viewname;
  	dns_view_t *view;
  	isc_boolean_t flushed;
  	isc_boolean_t found;
  	isc_result_t result;
  	isc_buffer_t b;
  	dns_fixedname_t fixed;
  	dns_name_t *name;
  
  	/* Skip the command name. */
  	ptr = next_token(&args, " \t");
  	if (ptr == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  
  	/* Find the domain name to flush. */
  	target = next_token(&args, " \t");
  	if (target == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  
  	isc_buffer_init(&b, target, strlen(target));
  	isc_buffer_add(&b, strlen(target));
  	dns_fixedname_init(&fixed);
  	name = dns_fixedname_name(&fixed);
  	result = dns_name_fromtext(name, &b, dns_rootname, 0, NULL);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	/* Look for the view name. */
  	viewname = next_token(&args, " \t");
  
  	result = isc_task_beginexclusive(server->task);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  	flushed = ISC_TRUE;
  	found = ISC_FALSE;
  	for (view = ISC_LIST_HEAD(server->viewlist);
  	     view != NULL;
  	     view = ISC_LIST_NEXT(view, link))
  	{
  		if (viewname != NULL && strcasecmp(viewname, view->name) != 0)
  			continue;
  		found = ISC_TRUE;
  		/*
  		 * It's a little inefficient to try flushing name for all views
  		 * if some of the views share a single cache.  But since the
  		 * operation is lightweight we prefer simplicity here.
  		 */
  		result = dns_view_flushnode(view, name, tree);
  		if (result != ISC_R_SUCCESS) {
  			flushed = ISC_FALSE;
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  				      "flushing %s '%s' in cache view '%s' "
  				      "failed: %s",
  				      tree ? "tree" : "name",
  				      target, view->name,
  				      isc_result_totext(result));
  		}
  	}
  	if (flushed && found) {
  		if (viewname != NULL)
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  				      "flushing %s '%s' in cache view '%s' "
  				      "succeeded",
  				      tree ? "tree" : "name",
  				      target, viewname);
  		else
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  				      "flushing %s '%s' in all cache views "
  				      "succeeded",
  				      tree ? "tree" : "name",
  				      target);
  		result = ISC_R_SUCCESS;
  	} else {
  		if (!found)
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_ERROR,
  				      "flushing %s '%s' in cache view '%s' "
  				      "failed: view not found",
  				      tree ? "tree" : "name",
  				      target, viewname);
  		result = ISC_R_FAILURE;
  	}
  	isc_task_endexclusive(server->task);
  	return (result);
  }
  
  isc_result_t
  ns_server_status(ns_server_t *server, isc_buffer_t *text) {
  	int zonecount, xferrunning, xferdeferred, soaqueries;
  	unsigned int n;
  	const char *ob = "", *cb = "", *alt = "";
  
  	if (ns_g_server->version_set) {
  		ob = " (";
  		cb = ")";
  		if (ns_g_server->version == NULL)
  			alt = "version.bind/txt/ch disabled";
  		else
  			alt = ns_g_server->version;
  	}
  	zonecount = dns_zonemgr_getcount(server->zonemgr, DNS_ZONESTATE_ANY);
  	xferrunning = dns_zonemgr_getcount(server->zonemgr,
  					   DNS_ZONESTATE_XFERRUNNING);
  	xferdeferred = dns_zonemgr_getcount(server->zonemgr,
  					    DNS_ZONESTATE_XFERDEFERRED);
  	soaqueries = dns_zonemgr_getcount(server->zonemgr,
  					  DNS_ZONESTATE_SOAQUERY);
  
  	n = snprintf((char *)isc_buffer_used(text),
  		     isc_buffer_availablelength(text),
  		     "version: %s%s%s%s\n"
  #ifdef ISC_PLATFORM_USETHREADS
  		     "CPUs found: %u\n"
  		     "worker threads: %u\n"
  		     "UDP listeners per interface: %u\n"
  #endif
  		     "number of zones: %u\n"
  		     "debug level: %d\n"
  		     "xfers running: %u\n"
  		     "xfers deferred: %u\n"
  		     "soa queries in progress: %u\n"
  		     "query logging is %s\n"
  		     "recursive clients: %d/%d/%d\n"
  		     "tcp clients: %d/%d\n"
  		     "server is up and running",
  		     ns_g_version, ob, alt, cb,
  #ifdef ISC_PLATFORM_USETHREADS
  		     ns_g_cpus_detected, ns_g_cpus, ns_g_udpdisp,
  #endif
  		     zonecount, ns_g_debuglevel, xferrunning, xferdeferred,
  		     soaqueries, server->log_queries ? "ON" : "OFF",
  		     server->recursionquota.used, server->recursionquota.soft,
  		     server->recursionquota.max,
  		     server->tcpquota.used, server->tcpquota.max);
  	if (n >= isc_buffer_availablelength(text))
  		return (ISC_R_NOSPACE);
  	isc_buffer_add(text, n);
  	return (ISC_R_SUCCESS);
  }
  
  static isc_result_t
  delete_keynames(dns_tsig_keyring_t *ring, char *target,
  		unsigned int *foundkeys)
  {
  	char namestr[DNS_NAME_FORMATSIZE];
  	isc_result_t result;
  	dns_rbtnodechain_t chain;
  	dns_name_t foundname;
  	dns_fixedname_t fixedorigin;
  	dns_name_t *origin;
  	dns_rbtnode_t *node;
  	dns_tsigkey_t *tkey;
  
  	dns_name_init(&foundname, NULL);
  	dns_fixedname_init(&fixedorigin);
  	origin = dns_fixedname_name(&fixedorigin);
  
   again:
  	dns_rbtnodechain_init(&chain, ring->mctx);
  	result = dns_rbtnodechain_first(&chain, ring->keys, &foundname,
  					origin);
  	if (result == ISC_R_NOTFOUND) {
  		dns_rbtnodechain_invalidate(&chain);
  		return (ISC_R_SUCCESS);
  	}
  	if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
  		dns_rbtnodechain_invalidate(&chain);
  		return (result);
  	}
  
  	for (;;) {
  		node = NULL;
  		dns_rbtnodechain_current(&chain, &foundname, origin, &node);
  		tkey = node->data;
  
  		if (tkey != NULL) {
  			if (!tkey->generated)
  				goto nextkey;
  
  			dns_name_format(&tkey->name, namestr, sizeof(namestr));
  			if (strcmp(namestr, target) == 0) {
  				(*foundkeys)++;
  				dns_rbtnodechain_invalidate(&chain);
  				(void)dns_rbt_deletename(ring->keys,
  							 &tkey->name,
  							 ISC_FALSE);
  				goto again;
  			}
  		}
  
  	nextkey:
  		result = dns_rbtnodechain_next(&chain, &foundname, origin);
  		if (result == ISC_R_NOMORE)
  			break;
  		if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
  			dns_rbtnodechain_invalidate(&chain);
  			return (result);
  		}
  	}
  
  	return (ISC_R_SUCCESS);
  }
  
  isc_result_t
  ns_server_tsigdelete(ns_server_t *server, char *command, isc_buffer_t *text) {
  	isc_result_t result;
  	unsigned int n;
  	dns_view_t *view;
  	unsigned int foundkeys = 0;
  	char *target;
  	char *viewname;
  
  	(void)next_token(&command, " \t");  /* skip command name */
  	target = next_token(&command, " \t");
  	if (target == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  	viewname = next_token(&command, " \t");
  
  	result = isc_task_beginexclusive(server->task);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  	for (view = ISC_LIST_HEAD(server->viewlist);
  	     view != NULL;
  	     view = ISC_LIST_NEXT(view, link)) {
  		if (viewname == NULL || strcmp(view->name, viewname) == 0) {
  			RWLOCK(&view->dynamickeys->lock, isc_rwlocktype_write);
  			result = delete_keynames(view->dynamickeys, target,
  						 &foundkeys);
  			RWUNLOCK(&view->dynamickeys->lock,
  				 isc_rwlocktype_write);
  			if (result != ISC_R_SUCCESS) {
  				isc_task_endexclusive(server->task);
  				return (result);
  			}
  		}
  	}
  	isc_task_endexclusive(server->task);
  
  	n = snprintf((char *)isc_buffer_used(text),
  		     isc_buffer_availablelength(text),
  		     "%d tsig keys deleted.\n", foundkeys);
  	if (n >= isc_buffer_availablelength(text))
  		return (ISC_R_NOSPACE);
  	isc_buffer_add(text, n);
  
  	return (ISC_R_SUCCESS);
  }
  
  static isc_result_t
  list_keynames(dns_view_t *view, dns_tsig_keyring_t *ring, isc_buffer_t *text,
  	     unsigned int *foundkeys)
  {
  	char namestr[DNS_NAME_FORMATSIZE];
  	char creatorstr[DNS_NAME_FORMATSIZE];
  	isc_result_t result;
  	dns_rbtnodechain_t chain;
  	dns_name_t foundname;
  	dns_fixedname_t fixedorigin;
  	dns_name_t *origin;
  	dns_rbtnode_t *node;
  	dns_tsigkey_t *tkey;
  	unsigned int n;
  	const char *viewname;
  
  	if (view != NULL)
  		viewname = view->name;
  	else
  		viewname = "(global)";
  
  	dns_name_init(&foundname, NULL);
  	dns_fixedname_init(&fixedorigin);
  	origin = dns_fixedname_name(&fixedorigin);
  	dns_rbtnodechain_init(&chain, ring->mctx);
  	result = dns_rbtnodechain_first(&chain, ring->keys, &foundname,
  					origin);
  	if (result == ISC_R_NOTFOUND) {
  		dns_rbtnodechain_invalidate(&chain);
  		return (ISC_R_SUCCESS);
  	}
  	if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
  		dns_rbtnodechain_invalidate(&chain);
  		return (result);
  	}
  
  	for (;;) {
  		node = NULL;
  		dns_rbtnodechain_current(&chain, &foundname, origin, &node);
  		tkey = node->data;
  
  		if (tkey != NULL) {
  			(*foundkeys)++;
  			dns_name_format(&tkey->name, namestr, sizeof(namestr));
  			if (tkey->generated) {
  				dns_name_format(tkey->creator, creatorstr,
  						sizeof(creatorstr));
  				n = snprintf((char *)isc_buffer_used(text),
  					     isc_buffer_availablelength(text),
  					     "view \"%s\"; type \"dynamic\"; key \"%s\"; creator \"%s\";\n",
  					     viewname, namestr, creatorstr);
  			} else {
  				n = snprintf((char *)isc_buffer_used(text),
  					     isc_buffer_availablelength(text),
  					     "view \"%s\"; type \"static\"; key \"%s\";\n",
  					     viewname, namestr);
  			}
  			if (n >= isc_buffer_availablelength(text)) {
  				dns_rbtnodechain_invalidate(&chain);
  				return (ISC_R_NOSPACE);
  			}
  			isc_buffer_add(text, n);
  		}
  		result = dns_rbtnodechain_next(&chain, &foundname, origin);
  		if (result == ISC_R_NOMORE)
  			break;
  		if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
  			dns_rbtnodechain_invalidate(&chain);
  			return (result);
  		}
  	}
  
  	return (ISC_R_SUCCESS);
  }
  
  isc_result_t
  ns_server_tsiglist(ns_server_t *server, isc_buffer_t *text) {
  	isc_result_t result;
  	unsigned int n;
  	dns_view_t *view;
  	unsigned int foundkeys = 0;
  
  	result = isc_task_beginexclusive(server->task);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  	for (view = ISC_LIST_HEAD(server->viewlist);
  	     view != NULL;
  	     view = ISC_LIST_NEXT(view, link)) {
  		RWLOCK(&view->statickeys->lock, isc_rwlocktype_read);
  		result = list_keynames(view, view->statickeys, text,
  				       &foundkeys);
  		RWUNLOCK(&view->statickeys->lock, isc_rwlocktype_read);
  		if (result != ISC_R_SUCCESS) {
  			isc_task_endexclusive(server->task);
  			return (result);
  		}
  		RWLOCK(&view->dynamickeys->lock, isc_rwlocktype_read);
  		result = list_keynames(view, view->dynamickeys, text,
  				       &foundkeys);
  		RWUNLOCK(&view->dynamickeys->lock, isc_rwlocktype_read);
  		if (result != ISC_R_SUCCESS) {
  			isc_task_endexclusive(server->task);
  			return (result);
  		}
  	}
  	isc_task_endexclusive(server->task);
  
  	if (foundkeys == 0) {
  		n = snprintf((char *)isc_buffer_used(text),
  			     isc_buffer_availablelength(text),
  			     "no tsig keys found.\n");
  		if (n >= isc_buffer_availablelength(text))
  			return (ISC_R_NOSPACE);
  		isc_buffer_add(text, n);
  	}
  
  	return (ISC_R_SUCCESS);
  }
  
  /*
   * Act on a "sign" or "loadkeys" command from the command channel.
   */
  isc_result_t
  ns_server_rekey(ns_server_t *server, char *args) {
  	isc_result_t result;
  	dns_zone_t *zone = NULL;
  	dns_zonetype_t type;
  	isc_uint16_t keyopts;
  	isc_boolean_t fullsign = ISC_FALSE;
  
  	if (strncasecmp(args, NS_COMMAND_SIGN, strlen(NS_COMMAND_SIGN)) == 0)
  	    fullsign = ISC_TRUE;
  
  	result = zone_from_args(server, args, NULL, &zone, NULL, ISC_TRUE);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  	if (zone == NULL)
  		return (ISC_R_UNEXPECTEDEND);   /* XXX: or do all zones? */
  
  	type = dns_zone_gettype(zone);
  	if (type != dns_zone_master) {
  		dns_zone_detach(&zone);
  		return (DNS_R_NOTMASTER);
  	}
  
  	keyopts = dns_zone_getkeyopts(zone);
  
  	/* "rndc loadkeys" requires "auto-dnssec maintain". */
  	if ((keyopts & DNS_ZONEKEY_ALLOW) == 0)
  		result = ISC_R_NOPERM;
  	else if ((keyopts & DNS_ZONEKEY_MAINTAIN) == 0 && !fullsign)
  		result = ISC_R_NOPERM;
  	else
  		dns_zone_rekey(zone, fullsign);
  
  	dns_zone_detach(&zone);
  	return (result);
  }
  
  /*
   * Act on a "sync" command from the command channel.
  */
  static isc_result_t
  synczone(dns_zone_t *zone, void *uap) {
  	isc_boolean_t cleanup = *(isc_boolean_t *)uap;
  	isc_result_t result;
  	dns_zone_t *raw = NULL;
  	char *journal;
  
  	dns_zone_getraw(zone, &raw);
  	if (raw != NULL) {
  		synczone(raw, uap);
  		dns_zone_detach(&raw);
  	}
  
  	result = dns_zone_flush(zone);
  	if (result != ISC_R_SUCCESS)
  		cleanup = ISC_FALSE;
  	if (cleanup) {
  		journal = dns_zone_getjournal(zone);
  		if (journal != NULL)
  			(void)isc_file_remove(journal);
  	}
  
  	return (result);
  }
  
  isc_result_t
  ns_server_sync(ns_server_t *server, char *args, isc_buffer_t *text) {
  	isc_result_t result, tresult;
  	dns_view_t *view;
  	dns_zone_t *zone = NULL;
  	char classstr[DNS_RDATACLASS_FORMATSIZE];
  	char zonename[DNS_NAME_FORMATSIZE];
  	const char *vname, *sep, *msg = NULL, *arg;
  	isc_boolean_t cleanup = ISC_FALSE;
  
  	(void) next_token(&args, " \t");
  
  	arg = next_token(&args, " \t");
  	if (arg != NULL &&
  	    (strcmp(arg, "-clean") == 0 || strcmp(arg, "-clear") == 0)) {
  		cleanup = ISC_TRUE;
  		arg = next_token(&args, " \t");
  	}
  
  	result = zone_from_args(server, args, arg, &zone, NULL, ISC_FALSE);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  
  	if (zone == NULL) {
  		result = isc_task_beginexclusive(server->task);
  		RUNTIME_CHECK(result == ISC_R_SUCCESS);
  		tresult = ISC_R_SUCCESS;
  		for (view = ISC_LIST_HEAD(server->viewlist);
  		     view != NULL;
  		     view = ISC_LIST_NEXT(view, link)) {
  			result = dns_zt_apply(view->zonetable, ISC_FALSE,
  					      synczone, &cleanup);
  			if (result != ISC_R_SUCCESS &&
  			    tresult == ISC_R_SUCCESS)
  				tresult = result;
  		}
  		isc_task_endexclusive(server->task);
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "dumping all zones%s: %s",
  			      cleanup ? ", removing journal files" : "",
  			      isc_result_totext(result));
  		return (tresult);
  	}
  
  	result = isc_task_beginexclusive(server->task);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  	result = synczone(zone, &cleanup);
  	isc_task_endexclusive(server->task);
  
  	if (msg != NULL && strlen(msg) < isc_buffer_availablelength(text))
  		isc_buffer_putmem(text, (const unsigned char *)msg,
  				  strlen(msg) + 1);
  
  	view = dns_zone_getview(zone);
  	if (strcmp(view->name, "_default") == 0 ||
  	    strcmp(view->name, "_bind") == 0)
  	{
  		vname = "";
  		sep = "";
  	} else {
  		vname = view->name;
  		sep = " ";
  	}
  	dns_rdataclass_format(dns_zone_getclass(zone), classstr,
  			      sizeof(classstr));
  	dns_name_format(dns_zone_getorigin(zone),
  			zonename, sizeof(zonename));
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  		      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  		      "sync: dumping zone '%s/%s'%s%s%s: %s",
  		      zonename, classstr, sep, vname,
  		      cleanup ? ", removing journal file" : "",
  		      isc_result_totext(result));
  	dns_zone_detach(&zone);
  	return (result);
  }
  
  /*
   * Act on a "freeze" or "thaw" command from the command channel.
   */
  isc_result_t
  ns_server_freeze(ns_server_t *server, isc_boolean_t freeze, char *args,
  		 isc_buffer_t *text)
  {
  	isc_result_t result, tresult;
  	dns_zone_t *zone = NULL, *raw = NULL;
  	dns_zonetype_t type;
  	char classstr[DNS_RDATACLASS_FORMATSIZE];
  	char zonename[DNS_NAME_FORMATSIZE];
  	dns_view_t *view;
  	const char *vname, *sep;
  	isc_boolean_t frozen;
  	const char *msg = NULL;
  
  	result = zone_from_args(server, args, NULL, &zone, NULL, ISC_TRUE);
  	if (result != ISC_R_SUCCESS)
  		return (result);
  	if (zone == NULL) {
  		result = isc_task_beginexclusive(server->task);
  		RUNTIME_CHECK(result == ISC_R_SUCCESS);
  		tresult = ISC_R_SUCCESS;
  		for (view = ISC_LIST_HEAD(server->viewlist);
  		     view != NULL;
  		     view = ISC_LIST_NEXT(view, link)) {
  			result = dns_view_freezezones(view, freeze);
  			if (result != ISC_R_SUCCESS &&
  			    tresult == ISC_R_SUCCESS)
  				tresult = result;
  		}
  		isc_task_endexclusive(server->task);
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "%s all zones: %s",
  			      freeze ? "freezing" : "thawing",
  			      isc_result_totext(tresult));
  		return (tresult);
  	}
  	dns_zone_getraw(zone, &raw);
  	if (raw != NULL) {
  		dns_zone_detach(&zone);
  		dns_zone_attach(raw, &zone);
  		dns_zone_detach(&raw);
  	}
  	type = dns_zone_gettype(zone);
  	if (type != dns_zone_master) {
  		dns_zone_detach(&zone);
  		return (DNS_R_NOTMASTER);
  	}
  
  	if (freeze && !dns_zone_isdynamic(zone, ISC_TRUE)) {
  		dns_zone_detach(&zone);
  		return (DNS_R_NOTDYNAMIC);
  	}
  
  	result = isc_task_beginexclusive(server->task);
  	RUNTIME_CHECK(result == ISC_R_SUCCESS);
  	frozen = dns_zone_getupdatedisabled(zone);
  	if (freeze) {
  		if (frozen) {
  			msg = "WARNING: The zone was already frozen.\n"
  			      "Someone else may be editing it or "
  			      "it may still be re-loading.";
  			result = DNS_R_FROZEN;
  		}
  		if (result == ISC_R_SUCCESS) {
  			result = dns_zone_flush(zone);
  			if (result != ISC_R_SUCCESS)
  				msg = "Flushing the zone updates to "
  				      "disk failed.";
  		}
  		if (result == ISC_R_SUCCESS)
  			dns_zone_setupdatedisabled(zone, freeze);
  	} else {
  		if (frozen) {
  			result = dns_zone_loadandthaw(zone);
  			switch (result) {
  			case ISC_R_SUCCESS:
  			case DNS_R_UPTODATE:
  				msg = "The zone reload and thaw was "
  				      "successful.";
  				result = ISC_R_SUCCESS;
  				break;
  			case DNS_R_CONTINUE:
  				msg = "A zone reload and thaw was started.\n"
  				      "Check the logs to see the result.";
  				result = ISC_R_SUCCESS;
  				break;
  			}
  		}
  	}
  	isc_task_endexclusive(server->task);
  
  	if (msg != NULL && strlen(msg) < isc_buffer_availablelength(text))
  		isc_buffer_putmem(text, (const unsigned char *)msg,
  				  strlen(msg) + 1);
  
  	view = dns_zone_getview(zone);
  	if (strcmp(view->name, "_default") == 0 ||
  	    strcmp(view->name, "_bind") == 0)
  	{
  		vname = "";
  		sep = "";
  	} else {
  		vname = view->name;
  		sep = " ";
  	}
  	dns_rdataclass_format(dns_zone_getclass(zone), classstr,
  			      sizeof(classstr));
  	dns_name_format(dns_zone_getorigin(zone),
  			zonename, sizeof(zonename));
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  		      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  		      "%s zone '%s/%s'%s%s: %s",
  		      freeze ? "freezing" : "thawing",
  		      zonename, classstr, sep, vname,
  		      isc_result_totext(result));
  	dns_zone_detach(&zone);
  	return (result);
  }
  
  #ifdef HAVE_LIBSCF
  /*
   * This function adds a message for rndc to echo if named
   * is managed by smf and is also running chroot.
   */
  isc_result_t
  ns_smf_add_message(isc_buffer_t *text) {
  	unsigned int n;
  
  	n = snprintf((char *)isc_buffer_used(text),
  		isc_buffer_availablelength(text),
  		"use svcadm(1M) to manage named");
  	if (n >= isc_buffer_availablelength(text))
  		return (ISC_R_NOSPACE);
  	isc_buffer_add(text, n);
  	return (ISC_R_SUCCESS);
  }
  #endif /* HAVE_LIBSCF */
  
  /*
   * Act on an "addzone" command from the command channel.
   */
  isc_result_t
  ns_server_add_zone(ns_server_t *server, char *args) {
  	isc_result_t	     result;
  	isc_buffer_t	     argbuf;
  	size_t		     arglen;
  	cfg_parser_t	    *parser = NULL;
  	cfg_obj_t	    *config = NULL;
  	const cfg_obj_t	    *vconfig = NULL;
  	const cfg_obj_t	    *views = NULL;
  	const cfg_obj_t     *parms = NULL;
  	const cfg_obj_t     *obj = NULL;
  	const cfg_listelt_t *element;
  	const char	    *zonename;
  	const char	    *classname = NULL;
  	const char	    *argp;
  	const char	    *viewname = NULL;
  	dns_rdataclass_t     rdclass;
  	dns_view_t	    *view = 0;
  	isc_buffer_t	     buf, *nbuf = NULL;
  	dns_name_t	     dnsname;
  	dns_zone_t	    *zone = NULL;
  	FILE		    *fp = NULL;
  	struct cfg_context  *cfg = NULL;
  
  	/* Try to parse the argument string */
  	arglen = strlen(args);
  	isc_buffer_init(&argbuf, args, arglen);
  	isc_buffer_add(&argbuf, strlen(args));
  	CHECK(cfg_parser_create(server->mctx, ns_g_lctx, &parser));
  	CHECK(cfg_parse_buffer(parser, &argbuf, &cfg_type_addzoneconf,
  			       &config));
  	CHECK(cfg_map_get(config, "addzone", &parms));
  
  	zonename = cfg_obj_asstring(cfg_tuple_get(parms, "name"));
  	isc_buffer_init(&buf, zonename, strlen(zonename));
  	isc_buffer_add(&buf, strlen(zonename));
  	dns_name_init(&dnsname, NULL);
  	isc_buffer_allocate(server->mctx, &nbuf, 256);
  	dns_name_setbuffer(&dnsname, nbuf);
  	CHECK(dns_name_fromtext(&dnsname, &buf, dns_rootname, ISC_FALSE, NULL));
  
  	/* Make sense of optional class argument */
  	obj = cfg_tuple_get(parms, "class");
  	CHECK(ns_config_getclass(obj, dns_rdataclass_in, &rdclass));
  	if (rdclass != dns_rdataclass_in && obj)
  		classname = cfg_obj_asstring(obj);
  
  	/* Make sense of optional view argument */
  	obj = cfg_tuple_get(parms, "view");
  	if (obj && cfg_obj_isstring(obj))
  		viewname = cfg_obj_asstring(obj);
  	if (viewname == NULL || *viewname == '\0')
  		viewname = "_default";
  	CHECK(dns_viewlist_find(&server->viewlist, viewname, rdclass, &view));
  
  	/* Are we accepting new zones? */
  	if (view->new_zone_file == NULL) {
  		result = ISC_R_NOPERM;
  		goto cleanup;
  	}
  
  	cfg = (struct cfg_context *) view->new_zone_config;
  	if (cfg == NULL) {
  		result = ISC_R_FAILURE;
  		goto cleanup;
  	}
  
  	/* Zone shouldn't already exist */
  	result = dns_zt_find(view->zonetable, &dnsname, 0, NULL, &zone);
  	if (result == ISC_R_SUCCESS) {
  		result = ISC_R_EXISTS;
  		goto cleanup;
  	} else if (result == DNS_R_PARTIALMATCH) {
  		/* Create our sub-zone anyway */
  		dns_zone_detach(&zone);
  		zone = NULL;
  	}
  	else if (result != ISC_R_NOTFOUND)
  		goto cleanup;
  
  	/* Find the view statement */
  	cfg_map_get(cfg->config, "view", &views);
  	for (element = cfg_list_first(views);
  	     element != NULL;
  	     element = cfg_list_next(element))
  	{
  		const char *vname;
  		vconfig = cfg_listelt_value(element);
  		vname = cfg_obj_asstring(cfg_tuple_get(vconfig, "name"));
  		if (vname && !strcasecmp(vname, viewname))
  			break;
  		vconfig = NULL;
  	}
  
  	/* Open save file for write configuration */
  	CHECK(isc_stdio_open(view->new_zone_file, "a", &fp));
  
  	/* Mark view unfrozen so that zone can be added */
  	isc_task_beginexclusive(server->task);
  	dns_view_thaw(view);
  	result = configure_zone(cfg->config, parms, vconfig,
  				server->mctx, view, cfg->actx, ISC_FALSE);
  	dns_view_freeze(view);
  	isc_task_endexclusive(server->task);
  	if (result != ISC_R_SUCCESS)
  		goto cleanup;
  
  	/* Is it there yet? */
  	CHECK(dns_zt_find(view->zonetable, &dnsname, 0, NULL, &zone));
  
  	/*
  	 * Load the zone from the master file.  If this fails, we'll
  	 * need to undo the configuration we've done already.
  	 */
  	result = dns_zone_loadnew(zone);
  	if (result != ISC_R_SUCCESS) {
  		dns_db_t *dbp = NULL;
  
  		isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  			      NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  			      "addzone failed; reverting.");
  
  		/* If the zone loaded partially, unload it */
  		if (dns_zone_getdb(zone, &dbp) == ISC_R_SUCCESS) {
  			dns_db_detach(&dbp);
  			dns_zone_unload(zone);
  		}
  
  		/* Remove the zone from the zone table */
  		dns_zt_unmount(view->zonetable, zone);
  		goto cleanup;
  	}
  
  	/* Flag the zone as having been added at runtime */
  	dns_zone_setadded(zone, ISC_TRUE);
  
  	/* Emit just the zone name from args */
  	CHECK(isc_stdio_write("zone ", 5, 1, fp, NULL));
  	CHECK(isc_stdio_write(zonename, strlen(zonename), 1, fp, NULL));
  	CHECK(isc_stdio_write(" ", 1, 1, fp, NULL));
  
  	/* Classname, if not default */
  	if (classname != NULL && *classname != '\0') {
  		CHECK(isc_stdio_write(classname, strlen(classname), 1, fp,
  				      NULL));
  		CHECK(isc_stdio_write(" ", 1, 1, fp, NULL));
  	}
  
  	/* Find beginning of option block from args */
  	for (argp = args; *argp; argp++, arglen--) {
  		if (*argp == '{') {	/* Assume matching '}' */
  			/* Add that to our file */
  			CHECK(isc_stdio_write(argp, arglen, 1, fp, NULL));
  
  			/* Make sure we end with a LF */
  			if (argp[arglen-1] != '\n') {
  				CHECK(isc_stdio_write("\n", 1, 1, fp, NULL));
  			}
  			break;
  		}
  	}
  
  	CHECK(isc_stdio_close(fp));
  	fp = NULL;
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				  NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  				  "zone %s added to view %s via addzone",
  				  zonename, viewname);
  
  	result = ISC_R_SUCCESS;
  
   cleanup:
  	if (fp != NULL)
  		isc_stdio_close(fp);
  	if (parser != NULL) {
  		if (config != NULL)
  			cfg_obj_destroy(parser, &config);
  		cfg_parser_destroy(&parser);
  	}
  	if (zone != NULL)
  		dns_zone_detach(&zone);
  	if (view != NULL)
  		dns_view_detach(&view);
  	if (nbuf != NULL)
  		isc_buffer_free(&nbuf);
  
  	return (result);
  }
  
  /*
   * Act on a "delzone" command from the command channel.
   */
  isc_result_t
  ns_server_del_zone(ns_server_t *server, char *args) {
  	isc_result_t	       result;
  	dns_zone_t	      *zone = NULL;
  	dns_view_t	      *view = NULL;
  	dns_db_t	      *dbp = NULL;
  	const char	      *filename = NULL;
  	char		      *tmpname = NULL;
  	char		       buf[1024];
  	const char	      *zonename = NULL;
  	size_t		       znamelen = 0;
  	FILE		      *ifp = NULL, *ofp = NULL;
  
  	/* Parse parameters */
  	CHECK(zone_from_args(server, args, NULL, &zone, &zonename, ISC_TRUE));
  	if (result != ISC_R_SUCCESS)
  		return (result);
  	if (zone == NULL) {
  		result = ISC_R_UNEXPECTEDEND;
  		goto cleanup;
  	}
  
  	/*
  	 * Was this zone originally added at runtime?
  	 * If not, we can't delete it now.
  	 */
  	if (!dns_zone_getadded(zone)) {
  		result = ISC_R_NOPERM;
  		goto cleanup;
  	}
  
  	if (zonename != NULL)
  		znamelen = strlen(zonename);
  
  	/* Dig out configuration for this zone */
  	view = dns_zone_getview(zone);
  	filename = view->new_zone_file;
  	if (filename == NULL) {
  		/* No adding zones in this view */
  		result = ISC_R_FAILURE;
  		goto cleanup;
  	}
  
  	/* Rewrite zone list */
  	result = isc_stdio_open(filename, "r", &ifp);
  	if (ifp != NULL && result == ISC_R_SUCCESS) {
  		char *found = NULL, *p = NULL;
  		size_t n;
  
  		/* Create a temporary file */
  		CHECK(isc_string_printf(buf, 1023, "%s.%ld", filename,
  					(long)getpid()));
  		if (!(tmpname = isc_mem_strdup(server->mctx, buf))) {
  			result = ISC_R_NOMEMORY;
  			goto cleanup;
  		}
  		CHECK(isc_stdio_open(tmpname, "w", &ofp));
  
  		/* Look for the entry for that zone */
  		while (fgets(buf, 1024, ifp)) {
  			/* A 'zone' line */
  			if (strncasecmp(buf, "zone", 4)) {
  				fputs(buf, ofp);
  				continue;
  			}
  			p = buf+4;
  
  			/* Locate a name */
  			while (*p &&
  			       ((*p == '"') || isspace((unsigned char)*p)))
  				p++;
  
  			/* Is that the zone we're looking for */
  			if (strncasecmp(p, zonename, znamelen)) {
  				fputs(buf, ofp);
  				continue;
  			}
  
  			/* And nothing else? */
  			p += znamelen;
  			if (isspace((unsigned char)*p) ||
  			    *p == '"' || *p == '{') {
  				/* This must be the entry */
  				found = p;
  				break;
  			}
  
  			/* Spit it out, keep looking */
  			fputs(buf, ofp);
  		}
  
  		/* Skip over an option block (matching # of braces) */
  		if (found) {
  			int obrace = 0, cbrace = 0;
  			for (;;) {
  				while (*p) {
  					if (*p == '{') obrace++;
  					if (*p == '}') cbrace++;
  					p++;
  				}
  				if (obrace && (obrace == cbrace))
  					break;
  				if (!fgets(buf, 1024, ifp))
  					break;
  				p = buf;
  			}
  
  			/* Just spool the remainder of the file out */
  			result = isc_stdio_read(buf, 1, 1024, ifp, &n);
  			while (n > 0U) {
  				if (result == ISC_R_EOF)
  					result = ISC_R_SUCCESS;
  				CHECK(result);
  				isc_stdio_write(buf, 1, n, ofp, NULL);
  				result = isc_stdio_read(buf, 1, 1024, ifp, &n);
  			}
  
  			/* Move temporary into place */
  			CHECK(isc_file_rename(tmpname, view->new_zone_file));
  		} else {
  			isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				      NS_LOGMODULE_SERVER, ISC_LOG_WARNING,
  				      "deleted zone %s was missing from "
  				      "new zone file", zonename);
  			goto cleanup;
  		}
  	}
  
  	/* Stop answering for this zone */
  	if (dns_zone_getdb(zone, &dbp) == ISC_R_SUCCESS) {
  		dns_db_detach(&dbp);
  		dns_zone_unload(zone);
  	}
  
  	CHECK(dns_zt_unmount(view->zonetable, zone));
  
  	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
  				  NS_LOGMODULE_SERVER, ISC_LOG_INFO,
  				  "zone %s removed via delzone", zonename);
  
  	result = ISC_R_SUCCESS;
  
   cleanup:
  	if (ifp != NULL)
  		isc_stdio_close(ifp);
  	if (ofp != NULL) {
  		isc_stdio_close(ofp);
  		isc_file_remove(tmpname);
  	}
  	if (tmpname != NULL)
  		isc_mem_free(server->mctx, tmpname);
  	if (zone != NULL)
  		dns_zone_detach(&zone);
  
  	return (result);
  }
  
  static void
  newzone_cfgctx_destroy(void **cfgp) {
  	struct cfg_context *cfg;
  
  	REQUIRE(cfgp != NULL && *cfgp != NULL);
  
  	cfg = *cfgp;
  
  	if (cfg->actx != NULL)
  		cfg_aclconfctx_detach(&cfg->actx);
  
  	if (cfg->parser != NULL) {
  		if (cfg->config != NULL)
  			cfg_obj_destroy(cfg->parser, &cfg->config);
  		cfg_parser_destroy(&cfg->parser);
  	}
  	if (cfg->nzparser != NULL) {
  		if (cfg->nzconfig != NULL)
  			cfg_obj_destroy(cfg->nzparser, &cfg->nzconfig);
  		cfg_parser_destroy(&cfg->nzparser);
  	}
  
  	isc_mem_putanddetach(&cfg->mctx, cfg, sizeof(*cfg));
  	*cfgp = NULL;
  }
  
  isc_result_t
  ns_server_signing(ns_server_t *server, char *args, isc_buffer_t *text) {
  	isc_result_t result = ISC_R_SUCCESS;
  	dns_zone_t *zone = NULL;
  	dns_name_t *origin;
  	dns_db_t *db = NULL;
  	dns_dbnode_t *node = NULL;
  	dns_dbversion_t *version = NULL;
  	dns_rdatatype_t privatetype;
  	dns_rdataset_t privset;
  	isc_boolean_t first = ISC_TRUE;
  	isc_boolean_t list = ISC_FALSE, clear = ISC_FALSE;
  	isc_boolean_t chain = ISC_FALSE;
  	char keystr[DNS_SECALG_FORMATSIZE + 7];
  	isc_uint8_t hash = 0, flags = 0, iter = 0, saltlen = 0;
  	unsigned char salt[255];
  	const char *ptr;
  	size_t n;
  
  	dns_rdataset_init(&privset);
  
  	/* Skip the command name. */
  	ptr = next_token(&args, " \t");
  	if (ptr == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  
  	/* Find out what we are to do. */
  	ptr = next_token(&args, " \t");
  	if (ptr == NULL)
  		return (ISC_R_UNEXPECTEDEND);
  
  	if (strcasecmp(ptr, "-list") == 0)
  		list = ISC_TRUE;
  	else if ((strcasecmp(ptr, "-clear") == 0)  ||
  		 (strcasecmp(ptr, "-clean") == 0)) {
  		clear = ISC_TRUE;
  		ptr = next_token(&args, " \t");
  		if (ptr == NULL)
  			return (ISC_R_UNEXPECTEDEND);
  		memcpy(keystr, ptr, sizeof(keystr));
  	} else if(strcasecmp(ptr, "-nsec3param") == 0) {
  		const char *hashstr, *flagstr, *iterstr;
  		char nbuf[512];
  
  		chain = ISC_TRUE;
  		hashstr = next_token(&args, " \t");
  		if (hashstr == NULL)
  			return (ISC_R_UNEXPECTEDEND);
  
  		if (strcasecmp(hashstr, "none") == 0)
  			hash = 0;
  		else {
  			flagstr = next_token(&args, " \t");
  			iterstr = next_token(&args, " \t");
  			if (flagstr == NULL || iterstr == NULL)
  				return (ISC_R_UNEXPECTEDEND);
  
  			n = snprintf(nbuf, sizeof(nbuf), "%s %s %s",
  				     hashstr, flagstr, iterstr);
  			if (n == sizeof(nbuf))
  				return (ISC_R_NOSPACE);
  			n = sscanf(nbuf, "%hhd %hhd %hhd",
  				   &hash, &flags, &iter);
  			if (n != 3)
  				return (ISC_R_BADNUMBER);
  
  			ptr = next_token(&args, " \t");
  			if (ptr == NULL)
  				return (ISC_R_UNEXPECTEDEND);
  			if (strcmp(ptr, "-") != 0) {
  				isc_buffer_t buf;
  
  				isc_buffer_init(&buf, salt, sizeof(salt));
  				CHECK(isc_hex_decodestring(ptr, &buf));
  				saltlen = isc_buffer_usedlength(&buf);
  			}
  		}
  	} else
  		CHECK(DNS_R_SYNTAX);
  
  	CHECK(zone_from_args(server, args, NULL, &zone, NULL, ISC_FALSE));
  	if (zone == NULL)
  		CHECK(ISC_R_UNEXPECTEDEND);
  
  	if (clear) {
  		CHECK(dns_zone_keydone(zone, keystr));
  		isc_buffer_putstr(text, "request queued");
  		isc_buffer_putuint8(text, 0);
  	} else if (chain) {
  		CHECK(dns_zone_setnsec3param(zone, hash, flags, iter,
  						saltlen, salt, ISC_TRUE));
  		isc_buffer_putstr(text, "request queued");
  		isc_buffer_putuint8(text, 0);
  	} else if (list) {
  		privatetype = dns_zone_getprivatetype(zone);
  		origin = dns_zone_getorigin(zone);
  		CHECK(dns_zone_getdb(zone, &db));
  		CHECK(dns_db_findnode(db, origin, ISC_FALSE, &node));
  		dns_db_currentversion(db, &version);
  
  		result = dns_db_findrdataset(db, node, version, privatetype,
  					     dns_rdatatype_none, 0,
  					     &privset, NULL);
  		if (result == ISC_R_NOTFOUND) {
  			isc_buffer_putstr(text, "No signing records found");
  			isc_buffer_putuint8(text, 0);
  			result = ISC_R_SUCCESS;
  			goto cleanup;
  		}
  
  		for (result = dns_rdataset_first(&privset);
  		     result == ISC_R_SUCCESS;
  		     result = dns_rdataset_next(&privset))
  		{
  			dns_rdata_t priv = DNS_RDATA_INIT;
  			char output[BUFSIZ];
  			isc_buffer_t buf;
  
  			dns_rdataset_current(&privset, &priv);
  
  			isc_buffer_init(&buf, output, sizeof(output));
  			CHECK(dns_private_totext(&priv, &buf));
  
  			if (!first)
  				isc_buffer_putstr(text, "\n");
  			first = ISC_FALSE;
  
  			n = snprintf((char *)isc_buffer_used(text),
  				     isc_buffer_availablelength(text),
  				     "%s", output);
  			if (n >= isc_buffer_availablelength(text))
  				CHECK(ISC_R_NOSPACE);
  
  			isc_buffer_add(text, n);
  		}
  
  		if (result == ISC_R_NOMORE)
  			result = ISC_R_SUCCESS;
  	}
  
   cleanup:
  	if (dns_rdataset_isassociated(&privset))
  		dns_rdataset_disassociate(&privset);
  	if (node != NULL)
  		dns_db_detachnode(db, &node);
  	if (version != NULL)
  		dns_db_closeversion(db, &version, ISC_FALSE);
  	if (db != NULL)
  		dns_db_detach(&db);
  	if (zone != NULL)
  		dns_zone_detach(&zone);
  
  	return (result);
  }
  