text: /*-
   * Copyright (c) 1994, Garrett Wollman
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD: soc2013/dpl/head/lib/libc/net/getnetnamadr.c 211319 2010-08-13 06:39:54Z ume $");
  
  #include "namespace.h"
  #include "reentrant.h"
  #include <sys/param.h>
  #include <sys/socket.h>
  #include <netinet/in.h>
  #include <arpa/inet.h>
  #include <netdb.h>
  #include <stdio.h>
  #include <ctype.h>
  #include <errno.h>
  #include <stdlib.h>
  #include <string.h>
  #include <stdarg.h>
  #include <nsswitch.h>
  #include "un-namespace.h"
  #include "netdb_private.h"
  #ifdef NS_CACHING
  #include "nscache.h"
  #endif
  
  extern int _ht_getnetbyname(void *, void *, va_list);
  extern int _dns_getnetbyname(void *, void *, va_list);
  extern int _nis_getnetbyname(void *, void *, va_list);
  extern int _ht_getnetbyaddr(void *, void *, va_list);
  extern int _dns_getnetbyaddr(void *, void *, va_list);
  extern int _nis_getnetbyaddr(void *, void *, va_list);
  
  /* Network lookup order if nsswitch.conf is broken or nonexistant */
  static const ns_src default_src[] = {
  	{ NSSRC_FILES, NS_SUCCESS },
  	{ NSSRC_DNS, NS_SUCCESS },
  	{ 0 }
  };
  
  NETDB_THREAD_ALLOC(netent_data)
  NETDB_THREAD_ALLOC(netdata)
  
  #ifdef NS_CACHING
  static int
  net_id_func(char *buffer, size_t *buffer_size, va_list ap, void *cache_mdata)
  {
  	char *name;
  	uint32_t net;
  	int type;
  
  	size_t desired_size, size;
  	enum nss_lookup_type lookup_type;
  	int res = NS_UNAVAIL;
  
  	lookup_type = (enum nss_lookup_type)cache_mdata;
  	switch (lookup_type) {
  	case nss_lt_name:
  		name = va_arg(ap, char *);
  
  		size = strlen(name);
  		desired_size = sizeof(enum nss_lookup_type) + size + 1;
  		if (desired_size > *buffer_size) {
  			res = NS_RETURN;
  			goto fin;
  		}
  
  		memcpy(buffer, &lookup_type, sizeof(enum nss_lookup_type));
  		memcpy(buffer + sizeof(enum nss_lookup_type), name, size + 1);
  
  		res = NS_SUCCESS;
  		break;
  	case nss_lt_id:
  		net = va_arg(ap, uint32_t);
  		type = va_arg(ap, int);
  
  		desired_size = sizeof(enum nss_lookup_type) +
  		    sizeof(uint32_t) + sizeof(int);
  		if (desired_size > *buffer_size) {
  			res = NS_RETURN;
  			goto fin;
  		}
  
  		memcpy(buffer, &lookup_type, sizeof(enum nss_lookup_type));
  		memcpy(buffer + sizeof(enum nss_lookup_type), &net,
  		    sizeof(uint32_t));
  		memcpy(buffer + sizeof(enum nss_lookup_type) + sizeof(uint32_t),
  		    &type, sizeof(int));
  
  		res = NS_SUCCESS;
  		break;
  	default:
  		/* should be unreachable */
  		return (NS_UNAVAIL);
  	}
  
  fin:
  	*buffer_size = desired_size;
  	return (res);
  }
  
  
  static int
  net_marshal_func(char *buffer, size_t *buffer_size, void *retval, va_list ap,
      void *cache_mdata)
  {
  	char *name;
  	uint32_t net;
  	int type;
  	struct netent *ne;
  	char *orig_buf;
  	size_t orig_buf_size;
  
  	struct netent new_ne;
  	size_t desired_size, size, aliases_size;
  	char *p;
  	char **alias;
  
  	switch ((enum nss_lookup_type)cache_mdata) {
  	case nss_lt_name:
  		name = va_arg(ap, char *);
  		break;
  	case nss_lt_id:
  		net = va_arg(ap, uint32_t);
  		type = va_arg(ap, int);
  	break;
  	case nss_lt_all:
  		break;
  	default:
  		/* should be unreachable */
  		return (NS_UNAVAIL);
  	}
  
  	ne = va_arg(ap, struct netent *);
  	orig_buf = va_arg(ap, char *);
  	orig_buf_size = va_arg(ap, size_t);
  
  	desired_size = _ALIGNBYTES + sizeof(struct netent) + sizeof(char *);
  	if (ne->n_name != NULL)
  		desired_size += strlen(ne->n_name) + 1;
  
  	if (ne->n_aliases != NULL) {
  		aliases_size = 0;
  		for (alias = ne->n_aliases; *alias; ++alias) {
  			desired_size += strlen(*alias) + 1;
  			++aliases_size;
  		}
  
  		desired_size += _ALIGNBYTES +
  		    (aliases_size + 1) * sizeof(char *);
  	}
  
  	if (*buffer_size < desired_size) {
  		/* this assignment is here for future use */
  		*buffer_size = desired_size;
  		return (NS_RETURN);
  	}
  
  	memcpy(&new_ne, ne, sizeof(struct netent));
  
  	*buffer_size = desired_size;
  	memset(buffer, 0, desired_size);
  	p = buffer + sizeof(struct netent) + sizeof(char *);
  	memcpy(buffer + sizeof(struct netent), &p, sizeof(char *));
  	p = (char *)_ALIGN(p);
  
  	if (new_ne.n_name != NULL) {
  		size = strlen(new_ne.n_name);
  		memcpy(p, new_ne.n_name, size);
  		new_ne.n_name = p;
  		p += size + 1;
  	}
  
  	if (new_ne.n_aliases != NULL) {
  		p = (char *)_ALIGN(p);
  		memcpy(p, new_ne.n_aliases, sizeof(char *) * aliases_size);
  		new_ne.n_aliases = (char **)p;
  		p += sizeof(char *) * (aliases_size + 1);
  
  		for (alias = new_ne.n_aliases; *alias; ++alias) {
  			size = strlen(*alias);
  			memcpy(p, *alias, size);
  			*alias = p;
  			p += size + 1;
  		}
  	}
  
  	memcpy(buffer, &new_ne, sizeof(struct netent));
  	return (NS_SUCCESS);
  }
  
  static int
  net_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap,
      void *cache_mdata)
  {
  	char *name;
  	uint32_t net;
  	int type;
  	struct netent *ne;
  	char *orig_buf;
  	size_t orig_buf_size;
  	int *ret_errno;
  
  	char *p;
  	char **alias;
  
  	switch ((enum nss_lookup_type)cache_mdata) {
  	case nss_lt_name:
  		name = va_arg(ap, char *);
  		break;
  	case nss_lt_id:
  		net = va_arg(ap, uint32_t);
  		type = va_arg(ap, int);
  		break;
  	case nss_lt_all:
  		break;
  	default:
  		/* should be unreachable */
  		return (NS_UNAVAIL);
  	}
  
  	ne = va_arg(ap, struct netent *);
  	orig_buf = va_arg(ap, char *);
  	orig_buf_size = va_arg(ap, size_t);
  	ret_errno = va_arg(ap, int *);
  
  	if (orig_buf_size <
  	    buffer_size - sizeof(struct netent) - sizeof(char *)) {
  		*ret_errno = ERANGE;
  		return (NS_RETURN);
  	}
  
  	memcpy(ne, buffer, sizeof(struct netent));
  	memcpy(&p, buffer + sizeof(struct netent), sizeof(char *));
  
  	orig_buf = (char *)_ALIGN(orig_buf);
  	memcpy(orig_buf, buffer + sizeof(struct netent) + sizeof(char *) +
  	    _ALIGN(p) - (size_t)p,
  	    buffer_size - sizeof(struct netent) - sizeof(char *) -
  	    _ALIGN(p) + (size_t)p);
  	p = (char *)_ALIGN(p);
  
  	NS_APPLY_OFFSET(ne->n_name, orig_buf, p, char *);
  	if (ne->n_aliases != NULL) {
  		NS_APPLY_OFFSET(ne->n_aliases, orig_buf, p, char **);
  
  		for (alias = ne->n_aliases; *alias; ++alias)
  			NS_APPLY_OFFSET(*alias, orig_buf, p, char *);
  	}
  
  	if (retval != NULL)
  		*((struct netent **)retval) = ne;
  
  	return (NS_SUCCESS);
  }
  #endif /* NS_CACHING */
  
  static void
  netent_data_free(void *ptr)
  {
  	struct netent_data *ned = ptr;
  
  	if (ned == NULL)
  		return;
  	ned->stayopen = 0;
  	_endnethtent(ned);
  	free(ned);
  }
  
  static void
  netdata_free(void *ptr)
  {
  	free(ptr);
  }
  
  int
  __copy_netent(struct netent *ne, struct netent *nptr, char *buf, size_t buflen)
  {
  	char *cp;
  	int i, n;
  	int numptr, len;
  
  	/* Find out the amount of space required to store the answer. */
  	numptr = 1; /* NULL ptr */
  	len = (char *)ALIGN(buf) - buf;
  	for (i = 0; ne->n_aliases[i]; i++, numptr++) {
  		len += strlen(ne->n_aliases[i]) + 1;
  	}
  	len += strlen(ne->n_name) + 1;
  	len += numptr * sizeof(char*);
  
  	if (len > (int)buflen) {
  		errno = ERANGE;
  		return (-1);
  	}
  
  	/* copy net value and type */
  	nptr->n_addrtype = ne->n_addrtype;
  	nptr->n_net = ne->n_net;
  
  	cp = (char *)ALIGN(buf) + numptr * sizeof(char *);
  
  	/* copy official name */
  	n = strlen(ne->n_name) + 1;
  	strcpy(cp, ne->n_name);
  	nptr->n_name = cp;
  	cp += n;
  
  	/* copy aliases */
  	nptr->n_aliases = (char **)ALIGN(buf);
  	for (i = 0 ; ne->n_aliases[i]; i++) {
  		n = strlen(ne->n_aliases[i]) + 1;
  		strcpy(cp, ne->n_aliases[i]);
  		nptr->n_aliases[i] = cp;
  		cp += n;
  	}
  	nptr->n_aliases[i] = NULL;
  
  	return (0);
  }
  
  int
  getnetbyname_r(const char *name, struct netent *ne, char *buffer,
      size_t buflen, struct netent **result, int *h_errorp)
  {
  #ifdef NS_CACHING
  	static const nss_cache_info cache_info =
      		NS_COMMON_CACHE_INFO_INITIALIZER(
  		networks, (void *)nss_lt_name,
  		net_id_func, net_marshal_func, net_unmarshal_func);
  #endif
  	static const ns_dtab dtab[] = {
  		NS_FILES_CB(_ht_getnetbyname, NULL)
  		{ NSSRC_DNS, _dns_getnetbyname, NULL },
  		NS_NIS_CB(_nis_getnetbyname, NULL) /* force -DHESIOD */
  #ifdef NS_CACHING
  		NS_CACHE_CB(&cache_info)
  #endif
  		{ 0 }
  	};
  	int rval, ret_errno = 0;
  
  	rval = _nsdispatch((void *)result, dtab, NSDB_NETWORKS,
  	    "getnetbyname_r", default_src, name, ne, buffer, buflen,
  	    &ret_errno, h_errorp);
  
  	if (rval != NS_SUCCESS) {
  		errno = ret_errno;
  		return ((ret_errno != 0) ? ret_errno : -1);
  	}
  	return (0);
  }
  
  int
  getnetbyaddr_r(uint32_t addr, int af, struct netent *ne, char *buffer,
      size_t buflen, struct netent **result, int *h_errorp)
  {
  #ifdef NS_CACHING
  	static const nss_cache_info cache_info =
      		NS_COMMON_CACHE_INFO_INITIALIZER(
  		networks, (void *)nss_lt_id,
  		net_id_func, net_marshal_func, net_unmarshal_func);
  #endif
  	static const ns_dtab dtab[] = {
  		NS_FILES_CB(_ht_getnetbyaddr, NULL)
  		{ NSSRC_DNS, _dns_getnetbyaddr, NULL },
  		NS_NIS_CB(_nis_getnetbyaddr, NULL) /* force -DHESIOD */
  #ifdef NS_CACHING
  		NS_CACHE_CB(&cache_info)
  #endif
  		{ 0 }
  	};
  	int rval, ret_errno = 0;
  
  	rval = _nsdispatch((void *)result, dtab, NSDB_NETWORKS,
  	    "getnetbyaddr_r", default_src, addr, af, ne, buffer, buflen,
  	    &ret_errno, h_errorp);
  
  	if (rval != NS_SUCCESS) {
  		errno = ret_errno;
  		return ((ret_errno != 0) ? ret_errno : -1);
  	}
  	return (0);
  }
  
  struct netent *
  getnetbyname(const char *name)
  {
  	struct netdata *nd;
  	struct netent *rval;
  	int ret_h_errno;
  
  	if ((nd = __netdata_init()) == NULL)
  		return (NULL);
  	if (getnetbyname_r(name, &nd->net, nd->data, sizeof(nd->data), &rval,
  	    &ret_h_errno) != 0)
  		return (NULL);
  	return (rval);
  }
  
  struct netent *
  getnetbyaddr(uint32_t addr, int af)
  {
  	struct netdata *nd;
  	struct netent *rval;
  	int ret_h_errno;
  
  	if ((nd = __netdata_init()) == NULL)
  		return (NULL);
  	if (getnetbyaddr_r(addr, af, &nd->net, nd->data, sizeof(nd->data),
  	    &rval, &ret_h_errno) != 0)
  		return (NULL);
  	return (rval);
  }
  
  void
  setnetent(int stayopen)
  {
  	struct netent_data *ned;
  
  	if ((ned = __netent_data_init()) == NULL)
  		return;
  	_setnethtent(stayopen, ned);
  	_setnetdnsent(stayopen);
  }
  
  void
  endnetent(void)
  {
  	struct netent_data *ned;
  
  	if ((ned = __netent_data_init()) == NULL)
  		return;
  	_endnethtent(ned);
  	_endnetdnsent();
  }
  