blob: fa4af183fbea9d72d45d34914041d10140d561b5 [file] [log] [blame]
Damien Miller34132e52000-01-14 15:45:46 +11001/*
2 * Copyright (c) 1995, 1996, 1998 Theo de Raadt. All rights reserved.
3 * Copyright (c) 1983, 1993, 1994
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. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the University of
17 * California, Berkeley and its contributors.
18 * This product includes software developed by Theo de Raadt.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include "config.h"
37
38#ifndef HAVE_RRESVPORT_AF
39
40#if defined(LIBC_SCCS) && !defined(lint)
41static char *rcsid = "$OpenBSD: rresvport.c,v 1.4 1999/12/17 20:48:03 deraadt Exp $";
42#endif /* LIBC_SCCS and not lint */
43
44#include "includes.h"
45
46#if 0
47int
48rresvport(alport)
49 int *alport;
50{
51 return rresvport_af(alport, AF_INET);
52}
53#endif
54
55int
56rresvport_af(alport, af)
57 int *alport;
Damien Millerb54b40e2000-06-23 08:23:34 +100058 sa_family_t af;
Damien Miller34132e52000-01-14 15:45:46 +110059{
60 struct sockaddr_storage ss;
61 struct sockaddr *sa;
62 u_int16_t *portp;
63 int s;
Damien Millereaf99942000-01-19 13:45:07 +110064 int salen;
Damien Miller34132e52000-01-14 15:45:46 +110065
66 bzero(&ss, sizeof ss);
67 sa = (struct sockaddr *)&ss;
68
69 switch (af) {
70 case AF_INET:
Damien Millereaf99942000-01-19 13:45:07 +110071 salen = sizeof(struct sockaddr_in);
Damien Miller34132e52000-01-14 15:45:46 +110072 portp = &((struct sockaddr_in *)sa)->sin_port;
73 break;
74 case AF_INET6:
Damien Millereaf99942000-01-19 13:45:07 +110075 salen = sizeof(struct sockaddr_in6);
Damien Miller34132e52000-01-14 15:45:46 +110076 portp = &((struct sockaddr_in6 *)sa)->sin6_port;
77 break;
78 default:
79 errno = EPFNOSUPPORT;
80 return (-1);
81 }
82 sa->sa_family = af;
83
84 s = socket(af, SOCK_STREAM, 0);
85 if (s < 0)
86 return (-1);
87
88 *portp = htons(*alport);
89 if (*alport < IPPORT_RESERVED - 1) {
Damien Millereaf99942000-01-19 13:45:07 +110090 if (bind(s, sa, salen) >= 0)
Damien Miller34132e52000-01-14 15:45:46 +110091 return (s);
92 if (errno != EADDRINUSE) {
93 (void)close(s);
94 return (-1);
95 }
96 }
97
98 *portp = 0;
99 if (bindresvport_af(s, sa, af) == -1) {
100 (void)close(s);
101 return (-1);
102 }
103 *alport = ntohs(*portp);
104 return (s);
105}
106
107#endif /* HAVE_RRESVPORT_AF */