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getservbyname_r.c revision 1.6 
      1 /*	$NetBSD: getservbyname_r.c,v 1.6 2007/03/21 02:35:39 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char sccsid[] = "@(#)getservbyname.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: getservbyname_r.c,v 1.6 2007/03/21 02:35:39 christos Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include "namespace.h"
     42 #include <assert.h>
     43 #include <netdb.h>
     44 #include <stdlib.h>
     45 #include <string.h>
     46 #include <db.h>
     47 
     48 #include "servent.h"
     49 
     50 #ifdef __weak_alias
     51 __weak_alias(getservbyname_r,_getservbyname_r)
     52 #endif
     53 
     54 static struct servent *
     55 _servent_getbyname(struct servent_data *sd, struct servent *sp,
     56     const char *name, const char *proto)
     57 {
     58 	if (sd->db == NULL)
     59 		return NULL;
     60 
     61 	if (sd->flags & _SV_DB) {
     62 		char buf[BUFSIZ];
     63 		DBT key, data;
     64 		DB *db = sd->db;
     65 		key.data = buf;
     66 
     67 		if (proto == NULL)
     68 			key.size = snprintf(buf, sizeof(buf), "\376%s", name);
     69 		else
     70 			key.size = snprintf(buf, sizeof(buf), "\376%s/%s",
     71 			    name, proto);
     72 		key.size++;
     73 
     74 		if ((*db->get)(db, &key, &data, 0) != 0)
     75 			return NULL;
     76 
     77 		if ((*db->get)(db, &data, &key, 0) != 0)
     78 			return NULL;
     79 
     80 		if (sd->line)
     81 			free(sd->line);
     82 
     83 		sd->line = strdup(key.data);
     84 		return _servent_parseline(sd, sp);
     85 	} else {
     86 		while (_servent_getline(sd) != -1) {
     87 			char **cp;
     88 			if (_servent_parseline(sd, sp) == NULL)
     89 				continue;
     90 
     91 			if (strcmp(name, sp->s_name) == 0)
     92 				goto gotname;
     93 
     94 			for (cp = sp->s_aliases; *cp; cp++)
     95 				if (strcmp(name, *cp) == 0)
     96 					goto gotname;
     97 			continue;
     98 gotname:
     99 			if (proto == NULL || strcmp(sp->s_proto, proto) == 0)
    100 				return sp;
    101 		}
    102 		return NULL;
    103 	}
    104 }
    105 
    106 struct servent *
    107 getservbyname_r(const char *name, const char *proto, struct servent *sp,
    108     struct servent_data *sd)
    109 {
    110 	_DIAGASSERT(name != NULL);
    111 	/* proto may be NULL */
    112 
    113 	setservent_r(sd->flags & _SV_STAYOPEN, sd);
    114 	sp = _servent_getbyname(sd, sp, name, proto);
    115 	if (!(sd->flags & _SV_STAYOPEN))
    116 		_servent_close(sd);
    117 	return sp;
    118 }
    119