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e00da40d | 1 | /* $OpenBSD: rresvport.c,v 1.9 2005/11/10 10:00:17 espie Exp $ */ |
3c0ef626 | 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. | |
70791e56 | 15 | * 3. Neither the name of the University nor the names of its contributors |
3c0ef626 | 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 | ||
e00da40d | 32 | /* OPENBSD ORIGINAL: lib/libc/net/rresvport.c */ |
33 | ||
e54b3d7c | 34 | #include "includes.h" |
3c0ef626 | 35 | |
36 | #ifndef HAVE_RRESVPORT_AF | |
37 | ||
2e437378 | 38 | #include <sys/types.h> |
39 | #include <sys/socket.h> | |
40 | ||
41 | #include <netinet/in.h> | |
42 | #include <arpa/inet.h> | |
43 | ||
44 | #include <errno.h> | |
45 | #include <stdlib.h> | |
46 | #include <string.h> | |
47 | ||
3c0ef626 | 48 | #if 0 |
49 | int | |
e00da40d | 50 | rresvport(int *alport) |
3c0ef626 | 51 | { |
52 | return rresvport_af(alport, AF_INET); | |
53 | } | |
54 | #endif | |
55 | ||
e00da40d | 56 | int |
3c0ef626 | 57 | rresvport_af(int *alport, sa_family_t af) |
58 | { | |
59 | struct sockaddr_storage ss; | |
60 | struct sockaddr *sa; | |
61 | u_int16_t *portp; | |
62 | int s; | |
63 | socklen_t salen; | |
64 | ||
65 | memset(&ss, '\0', sizeof ss); | |
66 | sa = (struct sockaddr *)&ss; | |
67 | ||
68 | switch (af) { | |
69 | case AF_INET: | |
70 | salen = sizeof(struct sockaddr_in); | |
71 | portp = &((struct sockaddr_in *)sa)->sin_port; | |
72 | break; | |
73 | case AF_INET6: | |
74 | salen = sizeof(struct sockaddr_in6); | |
75 | portp = &((struct sockaddr_in6 *)sa)->sin6_port; | |
76 | break; | |
77 | default: | |
78 | errno = EPFNOSUPPORT; | |
79 | return (-1); | |
80 | } | |
81 | sa->sa_family = af; | |
82 | ||
83 | s = socket(af, SOCK_STREAM, 0); | |
84 | if (s < 0) | |
85 | return (-1); | |
86 | ||
87 | *portp = htons(*alport); | |
88 | if (*alport < IPPORT_RESERVED - 1) { | |
89 | if (bind(s, sa, salen) >= 0) | |
90 | return (s); | |
91 | if (errno != EADDRINUSE) { | |
92 | (void)close(s); | |
93 | return (-1); | |
94 | } | |
95 | } | |
96 | ||
97 | *portp = 0; | |
98 | sa->sa_family = af; | |
99 | if (bindresvport_sa(s, sa) == -1) { | |
100 | (void)close(s); | |
101 | return (-1); | |
102 | } | |
103 | *alport = ntohs(*portp); | |
104 | return (s); | |
105 | } | |
106 | ||
107 | #endif /* HAVE_RRESVPORT_AF */ |