1 /* This file has be substantially modified from the original OpenBSD source */
3 /* $OpenBSD: bindresvport.c,v 1.15 2003/05/20 22:42:35 deraadt Exp $ */
6 * Copyright 1996, Jason Downs. All rights reserved.
7 * Copyright 1998, Theo de Raadt. All rights reserved.
8 * Copyright 2000, Damien Miller. All rights reserved.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 #ifndef HAVE_BINDRESVPORT_SA
38 #define ENDPORT (IPPORT_RESERVED - 1)
39 #define NPORTS (ENDPORT - STARTPORT + 1)
42 * Bind a socket to a privileged IP port
45 bindresvport_sa(sd, sa)
50 struct sockaddr_storage myaddr;
51 struct sockaddr_in *sin;
52 struct sockaddr_in6 *sin6;
59 memset(&myaddr, 0, sizeof(myaddr));
60 sa = (struct sockaddr *)&myaddr;
62 if (getsockname(sd, sa, &salen) == -1)
63 return -1; /* errno is correctly set */
66 memset(&myaddr, 0, salen);
71 sin = (struct sockaddr_in *)sa;
72 salen = sizeof(struct sockaddr_in);
73 portp = &sin->sin_port;
74 } else if (af == AF_INET6) {
75 sin6 = (struct sockaddr_in6 *)sa;
76 salen = sizeof(struct sockaddr_in6);
77 portp = &sin6->sin6_port;
86 port = (arc4random() % NPORTS) + STARTPORT;
91 for(i = 0; i < NPORTS; i++) {
94 error = bind(sd, sa, salen);
96 /* Terminate on success */
100 /* Terminate on errors, except "address already in use" */
101 if ((error < 0) && !((errno == EADDRINUSE) || (errno == EINVAL)))
112 #endif /* HAVE_BINDRESVPORT_SA */