1/*	$OpenBSD: getservbyport.c,v 1.8 2015/09/14 07:38:38 guenther Exp $ */
2/*
3 * Copyright (c) 1983, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <netdb.h>
32#include <stdio.h>
33#include <string.h>
34
35int
36getservbyport_r(int port, const char *proto, struct servent *se,
37    struct servent_data *sd)
38{
39	int error;
40
41	setservent_r(sd->stayopen, sd);
42	while ((error = getservent_r(se, sd)) == 0) {
43		if (se->s_port != port)
44			continue;
45		if (proto == 0 || strcmp(se->s_proto, proto) == 0)
46			break;
47	}
48	if (!sd->stayopen && sd->fp != NULL) {
49		fclose(sd->fp);
50		sd->fp = NULL;
51	}
52	return (error);
53}
54DEF_WEAK(getservbyport_r);
55
56struct servent *
57getservbyport(int port, const char *proto)
58{
59	extern struct servent_data _servent_data;
60	static struct servent serv;
61
62	if (getservbyport_r(port, proto, &serv, &_servent_data) != 0)
63		return (NULL);
64	return (&serv);
65}
66