blob: fb3f6f2b85767a7a61faa71c0c170dc1356ffe46 [file] [log] [blame]
Damien Miller34132e52000-01-14 15:45:46 +11001/*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part. Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user.
8 *
9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
12 *
13 * Sun RPC is provided with no support and without any obligation on the
14 * part of Sun Microsystems, Inc. to assist in its use, correction,
15 * modification or enhancement.
16 *
17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19 * OR ANY PART THEREOF.
20 *
21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22 * or profits or other special, indirect and consequential damages, even if
23 * Sun has been advised of the possibility of such damages.
24 *
25 * Sun Microsystems, Inc.
26 * 2550 Garcia Avenue
27 * Mountain View, California 94043
28 */
29
30#include "config.h"
31
Damien Miller7b60a172000-07-25 09:04:37 +100032#ifndef HAVE_BINDRESVPORT_AF
Damien Miller34132e52000-01-14 15:45:46 +110033
34#if defined(LIBC_SCCS) && !defined(lint)
35static char *rcsid = "$OpenBSD: bindresvport.c,v 1.11 1999/12/17 19:22:08 deraadt Exp $";
36#endif /* LIBC_SCCS and not lint */
37
38/*
39 * Copyright (c) 1987 by Sun Microsystems, Inc.
40 *
41 * Portions Copyright(C) 1996, Jason Downs. All rights reserved.
42 */
43
44#include "includes.h"
45
46#define STARTPORT 600
47#define ENDPORT (IPPORT_RESERVED - 1)
48#define NPORTS (ENDPORT - STARTPORT + 1)
49
Damien Miller34132e52000-01-14 15:45:46 +110050/*
51 * Bind a socket to a privileged IP port
52 */
53int
54bindresvport_af(sd, sa, af)
55 int sd;
56 struct sockaddr *sa;
57 int af;
58{
59 int error;
60 struct sockaddr_storage myaddr;
61 struct sockaddr_in *sin;
62 struct sockaddr_in6 *sin6;
63 u_int16_t *portp;
Damien Miller8dbbe6e2000-01-22 18:17:42 +110064 u_int16_t port;
Damien Miller34132e52000-01-14 15:45:46 +110065 int salen;
66 int i;
67
68 if (sa == NULL) {
69 memset(&myaddr, 0, sizeof(myaddr));
70 sa = (struct sockaddr *)&myaddr;
71 }
72
73 if (af == AF_INET) {
74 sin = (struct sockaddr_in *)sa;
75 salen = sizeof(struct sockaddr_in);
76 portp = &sin->sin_port;
77 } else if (af == AF_INET6) {
78 sin6 = (struct sockaddr_in6 *)sa;
79 salen = sizeof(struct sockaddr_in6);
80 portp = &sin6->sin6_port;
81 } else {
82 errno = EPFNOSUPPORT;
83 return (-1);
84 }
85 sa->sa_family = af;
86
Damien Miller8dbbe6e2000-01-22 18:17:42 +110087 port = ntohs(*portp);
88 if (port == 0)
89 port = (arc4random() % NPORTS) + STARTPORT;
Damien Miller34132e52000-01-14 15:45:46 +110090
91 for(i = 0; i < NPORTS; i++) {
Damien Miller8dbbe6e2000-01-22 18:17:42 +110092 *portp = htons(port);
93
Damien Miller34132e52000-01-14 15:45:46 +110094 error = bind(sd, sa, salen);
Damien Miller19fe9c72000-01-17 15:23:01 +110095
Damien Millerb9b94a72000-01-17 09:52:46 +110096 /* Terminate on success */
97 if (error == 0)
Damien Miller34132e52000-01-14 15:45:46 +110098 break;
99
Damien Millerb9b94a72000-01-17 09:52:46 +1100100 /* Terminate on errors, except "address already in use" */
Damien Miller19fe9c72000-01-17 15:23:01 +1100101 if ((error < 0) && !((errno == EADDRINUSE) || (errno == EINVAL)))
Damien Millerb9b94a72000-01-17 09:52:46 +1100102 break;
103
Damien Miller8dbbe6e2000-01-22 18:17:42 +1100104 port++;
105 if (port > ENDPORT)
106 port = STARTPORT;
Damien Miller34132e52000-01-14 15:45:46 +1100107 }
108
109 return (error);
110}
111
Damien Miller7b60a172000-07-25 09:04:37 +1000112#endif /* HAVE_BINDRESVPORT_AF */