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3c0ef626 | 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 "config.h" | |
37 | ||
38 | #ifndef HAVE_RRESVPORT_AF | |
39 | ||
40 | #if defined(LIBC_SCCS) && !defined(lint) | |
41 | static 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 | |
47 | int | |
48 | rresvport(alport) | |
49 | int *alport; | |
50 | { | |
51 | return rresvport_af(alport, AF_INET); | |
52 | } | |
53 | #endif | |
54 | ||
55 | int | |
56 | rresvport_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 */ |