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f97dc218 | 1 | /* $OpenBSD: rresvport.c,v 1.9 2005/11/10 10:00:17 espie Exp $ */ |
48e671d5 | 2 | /* |
3 | * Copyright (c) 1995, 1996, 1998 Theo de Raadt. All rights reserved. | |
4 | * Copyright (c) 1983, 1993, 1994 | |
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. | |
3e67f7df | 15 | * 3. Neither the name of the University nor the names of its contributors |
48e671d5 | 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 | ||
f6d4fb87 | 32 | /* OPENBSD ORIGINAL: lib/libc/net/rresvport.c */ |
33 | ||
17962c40 | 34 | #include "includes.h" |
48e671d5 | 35 | |
36 | #ifndef HAVE_RRESVPORT_AF | |
37 | ||
aa751414 | 38 | #include <sys/types.h> |
39 | #include <sys/socket.h> | |
40 | ||
41 | #include <netinet/in.h> | |
42 | ||
4f4b7d4d | 43 | #include <errno.h> |
e429fba8 | 44 | #include <stdlib.h> |
e204f3ee | 45 | #include <string.h> |
4f4b7d4d | 46 | |
48e671d5 | 47 | #if 0 |
48 | int | |
8c603515 | 49 | rresvport(int *alport) |
48e671d5 | 50 | { |
51 | return rresvport_af(alport, AF_INET); | |
52 | } | |
53 | #endif | |
54 | ||
8c603515 | 55 | int |
ec90a7d6 | 56 | rresvport_af(int *alport, sa_family_t af) |
48e671d5 | 57 | { |
58 | struct sockaddr_storage ss; | |
59 | struct sockaddr *sa; | |
60 | u_int16_t *portp; | |
61 | int s; | |
f1c4659d | 62 | socklen_t salen; |
48e671d5 | 63 | |
c193d002 | 64 | memset(&ss, '\0', sizeof ss); |
48e671d5 | 65 | sa = (struct sockaddr *)&ss; |
66 | ||
67 | switch (af) { | |
68 | case AF_INET: | |
20af321f | 69 | salen = sizeof(struct sockaddr_in); |
48e671d5 | 70 | portp = &((struct sockaddr_in *)sa)->sin_port; |
71 | break; | |
72 | case AF_INET6: | |
20af321f | 73 | salen = sizeof(struct sockaddr_in6); |
48e671d5 | 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) { | |
20af321f | 88 | if (bind(s, sa, salen) >= 0) |
48e671d5 | 89 | return (s); |
90 | if (errno != EADDRINUSE) { | |
91 | (void)close(s); | |
92 | return (-1); | |
93 | } | |
94 | } | |
95 | ||
96 | *portp = 0; | |
d7d5f0b2 | 97 | sa->sa_family = af; |
98 | if (bindresvport_sa(s, sa) == -1) { | |
48e671d5 | 99 | (void)close(s); |
100 | return (-1); | |
101 | } | |
102 | *alport = ntohs(*portp); | |
103 | return (s); | |
104 | } | |
105 | ||
106 | #endif /* HAVE_RRESVPORT_AF */ |