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getservbyport_r.c revision 1.4 
      1 /*	$NetBSD: getservbyport_r.c,v 1.4 2006/07/27 22:03:49 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[] = "@(#)getservbyport.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: getservbyport_r.c,v 1.4 2006/07/27 22:03:49 christos Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include "namespace.h"
     42 #include <stdio.h>
     43 #include <netdb.h>
     44 #include <string.h>
     45 #include <stdlib.h>
     46 #include <db.h>
     47 
     48 #include "servent.h"
     49 
     50 #ifdef __weak_alias
     51 __weak_alias(getservbyport_r,_getservbyport_r)
     52 #endif
     53 
     54 static struct servent *
     55 _servent_getbyport(struct servent_data *sd, struct servent *sp, int port,
     56     const char *proto)
     57 {
     58 	if (sd->flags & _SV_DB) {
     59 		char buf[BUFSIZ];
     60 		DBT key, data;
     61 		DB *db = sd->db;
     62 		key.data = buf;
     63 
     64 		port = htons(port);
     65 		if (proto == NULL)
     66 			key.size = snprintf(buf, sizeof(buf), "\376%d", port);
     67 		else
     68 			key.size = snprintf(buf, sizeof(buf), "%d/%s", port,
     69 			    proto);
     70 		key.size++;
     71 
     72 		if ((*db->get)(db, &key, &data, 0) != 0)
     73 			return NULL;
     74 
     75 		if (sd->line)
     76 			free(sd->line);
     77 
     78 		sd->line = strdup(data.data);
     79 		return _servent_parseline(sd, sp);
     80 	} else {
     81 		while (_servent_getline(sd) != -1) {
     82 			if (_servent_parseline(sd, sp) == NULL)
     83 				continue;
     84 			if (sp->s_port != port)
     85 				continue;
     86 			if (proto == NULL || strcmp(sp->s_proto, proto) == 0)
     87 				return sp;
     88 		}
     89 		return NULL;
     90 	}
     91 }
     92 
     93 struct servent *
     94 getservbyport_r(int port, const char *proto, struct servent *sp,
     95     struct servent_data *sd)
     96 {
     97 	setservent_r(sd->flags & _SV_STAYOPEN, sd);
     98 	sp = _servent_getbyport(sd, sp, port, proto);
     99 	if (!(sd->flags & _SV_STAYOPEN))
    100 		_servent_close(sd);
    101 	return sp;
    102 }
    103