Initial import from FreeBSD RELENG_4:
[dragonfly.git] / crypto / openssh / openbsd-compat / rresvport.c
CommitLineData
984263bc
MD
1/*
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 "includes.h"
37
38#ifndef HAVE_RRESVPORT_AF
39
40#if defined(LIBC_SCCS) && !defined(lint)
41static char *rcsid = "$OpenBSD: rresvport.c,v 1.5 2000/01/26 03:43:20 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(int *alport, sa_family_t af)
57{
58 struct sockaddr_storage ss;
59 struct sockaddr *sa;
60 u_int16_t *portp;
61 int s;
62 socklen_t salen;
63
64 memset(&ss, '\0', sizeof ss);
65 sa = (struct sockaddr *)&ss;
66
67 switch (af) {
68 case AF_INET:
69 salen = sizeof(struct sockaddr_in);
70 portp = &((struct sockaddr_in *)sa)->sin_port;
71 break;
72 case AF_INET6:
73 salen = sizeof(struct sockaddr_in6);
74 portp = &((struct sockaddr_in6 *)sa)->sin6_port;
75 break;
76 default:
77 errno = EPFNOSUPPORT;
78 return (-1);
79 }
80 sa->sa_family = af;
81
82 s = socket(af, SOCK_STREAM, 0);
83 if (s < 0)
84 return (-1);
85
86 *portp = htons(*alport);
87 if (*alport < IPPORT_RESERVED - 1) {
88 if (bind(s, sa, salen) >= 0)
89 return (s);
90 if (errno != EADDRINUSE) {
91 (void)close(s);
92 return (-1);
93 }
94 }
95
96 *portp = 0;
97 sa->sa_family = af;
98 if (bindresvport_sa(s, sa) == -1) {
99 (void)close(s);
100 return (-1);
101 }
102 *alport = ntohs(*portp);
103 return (s);
104}
105
106#endif /* HAVE_RRESVPORT_AF */