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d74671e4 | 1 | /* OPENBSD ORIGINAL: lib/libc/net/rresvport.c */ |
2 | ||
48e671d5 | 3 | /* |
4 | * Copyright (c) 1995, 1996, 1998 Theo de Raadt. All rights reserved. | |
5 | * Copyright (c) 1983, 1993, 1994 | |
6 | * The Regents of the University of California. All rights reserved. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
3e67f7df | 16 | * 3. Neither the name of the University nor the names of its contributors |
48e671d5 | 17 | * may be used to endorse or promote products derived from this software |
18 | * without specific prior written permission. | |
19 | * | |
20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
30 | * SUCH DAMAGE. | |
31 | */ | |
32 | ||
17962c40 | 33 | #include "includes.h" |
48e671d5 | 34 | |
35 | #ifndef HAVE_RRESVPORT_AF | |
36 | ||
37 | #if defined(LIBC_SCCS) && !defined(lint) | |
3e67f7df | 38 | static char *rcsid = "$OpenBSD: rresvport.c,v 1.6 2003/06/03 02:11:35 deraadt Exp $"; |
48e671d5 | 39 | #endif /* LIBC_SCCS and not lint */ |
40 | ||
41 | #include "includes.h" | |
42 | ||
43 | #if 0 | |
44 | int | |
45 | rresvport(alport) | |
46 | int *alport; | |
47 | { | |
48 | return rresvport_af(alport, AF_INET); | |
49 | } | |
50 | #endif | |
51 | ||
ec90a7d6 | 52 | int |
53 | rresvport_af(int *alport, sa_family_t af) | |
48e671d5 | 54 | { |
55 | struct sockaddr_storage ss; | |
56 | struct sockaddr *sa; | |
57 | u_int16_t *portp; | |
58 | int s; | |
f1c4659d | 59 | socklen_t salen; |
48e671d5 | 60 | |
c193d002 | 61 | memset(&ss, '\0', sizeof ss); |
48e671d5 | 62 | sa = (struct sockaddr *)&ss; |
63 | ||
64 | switch (af) { | |
65 | case AF_INET: | |
20af321f | 66 | salen = sizeof(struct sockaddr_in); |
48e671d5 | 67 | portp = &((struct sockaddr_in *)sa)->sin_port; |
68 | break; | |
69 | case AF_INET6: | |
20af321f | 70 | salen = sizeof(struct sockaddr_in6); |
48e671d5 | 71 | portp = &((struct sockaddr_in6 *)sa)->sin6_port; |
72 | break; | |
73 | default: | |
74 | errno = EPFNOSUPPORT; | |
75 | return (-1); | |
76 | } | |
77 | sa->sa_family = af; | |
78 | ||
79 | s = socket(af, SOCK_STREAM, 0); | |
80 | if (s < 0) | |
81 | return (-1); | |
82 | ||
83 | *portp = htons(*alport); | |
84 | if (*alport < IPPORT_RESERVED - 1) { | |
20af321f | 85 | if (bind(s, sa, salen) >= 0) |
48e671d5 | 86 | return (s); |
87 | if (errno != EADDRINUSE) { | |
88 | (void)close(s); | |
89 | return (-1); | |
90 | } | |
91 | } | |
92 | ||
93 | *portp = 0; | |
d7d5f0b2 | 94 | sa->sa_family = af; |
95 | if (bindresvport_sa(s, sa) == -1) { | |
48e671d5 | 96 | (void)close(s); |
97 | return (-1); | |
98 | } | |
99 | *alport = ntohs(*portp); | |
100 | return (s); | |
101 | } | |
102 | ||
103 | #endif /* HAVE_RRESVPORT_AF */ |