text: /*	$NetBSD: getservbyname_r.c,v 1.9 2012/03/13 21:13:41 christos Exp $	*/
  
  /*
   * Copyright (c) 1983, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * 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.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND 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>
  #if defined(LIBC_SCCS) && !defined(lint)
  #if 0
  static char sccsid[] = "@(#)getservbyname.c	8.1 (Berkeley) 6/4/93";
  #else
  __RCSID("$NetBSD: getservbyname_r.c,v 1.9 2012/03/13 21:13:41 christos Exp $");
  #endif
  #endif /* LIBC_SCCS and not lint */
  
  #include "namespace.h"
  #include <assert.h>
  #include <cdbr.h>
  #include <netdb.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include "servent.h"
  
  #ifdef __weak_alias
  __weak_alias(getservbyname_r,_getservbyname_r)
  #endif
  
  static struct servent *
  _servent_getbyname(struct servent_data *sd, struct servent *sp,
      const char *name, const char *proto)
  {
  
  	if ((sd->flags & (_SV_CDB | _SV_PLAINFILE)) == 0)
  		return NULL;
  
  	if (sd->flags & _SV_CDB) {
  		uint8_t buf[255 * 2 + 2];
  		size_t namelen, protolen;
  		const uint8_t *data, *data_end;
  		const void *data_ptr;
  		size_t datalen;
  
  		namelen = strlen(name);
  		if (namelen == 0 || namelen > 255)
  			return NULL;
  		if (proto != NULL) {
  			protolen = strlen(proto);
  			if (protolen == 0 || protolen > 255)
  				return NULL;
  		} else
  			protolen = 0;
  		if (namelen + protolen > 255)
  			return NULL;
  
  		buf[0] = (uint8_t)namelen;
  		buf[1] = (uint8_t)protolen;
  		memcpy(buf + 2, name, namelen);
  		memcpy(buf + 2 + namelen, proto, protolen);
  
  		if (cdbr_find(sd->cdb, buf, 2 + namelen + protolen,
  		    &data_ptr, &datalen))
  			return NULL;
  
  		if (datalen < namelen + protolen + 6)
  			return NULL;
  
  		data = data_ptr;
  		data_end = data + datalen;
  		if (protolen) {
  			if (data[2] != protolen)
  				return NULL;
  			if (memcmp(data + 3, proto, protolen + 1))
  				return NULL;
  		}
  		data += 3 + data[2] + 1;
  		if (data > data_end)
  			return NULL;
  		while (data != data_end) {
  			if (*data == '\0')
  				return NULL;
  			if (data + data[0] + 2 > data_end)
  				return NULL;
  			if (data[0] == namelen &&
  			    memcmp(data + 1, name, namelen + 1) == 0)
  				return _servent_parsedb(sd, sp, data_ptr,
  				    datalen);
  			data += data[0] + 2;
  		}
  		return NULL;
  	} else {
  		while (_servent_getline(sd) != -1) {
  			char **cp;
  			if (_servent_parseline(sd, sp) == NULL)
  				continue;
  
  			if (strcmp(name, sp->s_name) == 0)
  				goto gotname;
  
  			for (cp = sp->s_aliases; *cp; cp++)
  				if (strcmp(name, *cp) == 0)
  					goto gotname;
  			continue;
  gotname:
  			if (proto == NULL || strcmp(sp->s_proto, proto) == 0)
  				return sp;
  		}
  		return NULL;
  	}
  }
  
  struct servent *
  getservbyname_r(const char *name, const char *proto, struct servent *sp,
      struct servent_data *sd)
  {
  	_DIAGASSERT(name != NULL);
  	/* proto may be NULL */
  
  	setservent_r(sd->flags & _SV_STAYOPEN, sd);
  	sp = _servent_getbyname(sd, sp, name, proto);
  	if (!(sd->flags & _SV_STAYOPEN))
  		_servent_close(sd);
  	return sp;
  }
  