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2c06c99b | 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. | |
0fff78ff | 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 | ||
2c06c99b | 32 | /* OPENBSD ORIGINAL: lib/libc/net/rresvport.c */ |
33 | ||
41b2f314 | 34 | #include "includes.h" |
3c0ef626 | 35 | |
36 | #ifndef HAVE_RRESVPORT_AF | |
37 | ||
9108f8d9 | 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> | |
22616013 | 47 | #include <unistd.h> |
9108f8d9 | 48 | |
3c0ef626 | 49 | #if 0 |
50 | int | |
2c06c99b | 51 | rresvport(int *alport) |
3c0ef626 | 52 | { |
53 | return rresvport_af(alport, AF_INET); | |
54 | } | |
55 | #endif | |
56 | ||
2c06c99b | 57 | int |
3c0ef626 | 58 | rresvport_af(int *alport, sa_family_t af) |
59 | { | |
60 | struct sockaddr_storage ss; | |
61 | struct sockaddr *sa; | |
62 | u_int16_t *portp; | |
63 | int s; | |
64 | socklen_t salen; | |
65 | ||
66 | memset(&ss, '\0', sizeof ss); | |
67 | sa = (struct sockaddr *)&ss; | |
68 | ||
69 | switch (af) { | |
70 | case AF_INET: | |
71 | salen = sizeof(struct sockaddr_in); | |
72 | portp = &((struct sockaddr_in *)sa)->sin_port; | |
73 | break; | |
74 | case AF_INET6: | |
75 | salen = sizeof(struct sockaddr_in6); | |
76 | 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) { | |
90 | if (bind(s, sa, salen) >= 0) | |
91 | return (s); | |
92 | if (errno != EADDRINUSE) { | |
93 | (void)close(s); | |
94 | return (-1); | |
95 | } | |
96 | } | |
97 | ||
98 | *portp = 0; | |
99 | sa->sa_family = af; | |
100 | if (bindresvport_sa(s, sa) == -1) { | |
101 | (void)close(s); | |
102 | return (-1); | |
103 | } | |
104 | *alport = ntohs(*portp); | |
105 | return (s); | |
106 | } | |
107 | ||
108 | #endif /* HAVE_RRESVPORT_AF */ |