1/*
2 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
7 * Reserved.  This file contains Original Code and/or Modifications of
8 * Original Code as defined in and that are subject to the Apple Public
9 * Source License Version 1.1 (the "License").  You may not use this file
10 * except in compliance with the License.  Please obtain a copy of the
11 * License at http://www.apple.com/publicsource and read it before using
12 * this file.
13 *
14 * The Original Code and all software distributed under the License are
15 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
19 * License for the specific language governing rights and limitations
20 * under the License.
21 *
22 * @APPLE_LICENSE_HEADER_END@
23 */
24/*
25 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
26 * unrestricted use provided that this legend is included on all tape
27 * media and as a part of the software program in whole or part.  Users
28 * may copy or modify Sun RPC without charge, but are not authorized
29 * to license or distribute it to anyone else except as part of a product or
30 * program developed by the user.
31 *
32 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
33 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
34 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
35 *
36 * Sun RPC is provided with no support and without any obligation on the
37 * part of Sun Microsystems, Inc. to assist in its use, correction,
38 * modification or enhancement.
39 *
40 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
41 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
42 * OR ANY PART THEREOF.
43 *
44 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
45 * or profits or other special, indirect and consequential damages, even if
46 * Sun has been advised of the possibility of such damages.
47 *
48 * Sun Microsystems, Inc.
49 * 2550 Garcia Avenue
50 * Mountain View, California  94043
51 */
52
53#if defined(LIBC_SCCS) && !defined(lint)
54/*static char *sccsid = "from: @(#)bindresvport.c 1.8 88/02/08 SMI";*/
55/*static char *sccsid = "from: @(#)bindresvport.c	2.2 88/07/29 4.0 RPCSRC";*/
56/*from: OpenBSD: bindresvport.c,v 1.7 1996/07/30 16:25:47 downsj Exp */
57static char *rcsid = "$FreeBSD: src/lib/libc/rpc/bindresvport.c,v 1.12 2000/01/26 09:02:42 shin Exp $";
58#endif
59
60/*
61 * Copyright (c) 1987 by Sun Microsystems, Inc.
62 *
63 * Portions Copyright(C) 1996, Jason Downs.  All rights reserved.
64 */
65
66#include <string.h>
67#include <unistd.h>
68#include <sys/types.h>
69#include <sys/errno.h>
70#include <sys/socket.h>
71#include <netinet/in.h>
72
73/*
74 * Bind a socket to a privileged port for whatever protocol.
75 */
76int
77bindresvport_sa(sd, sa)
78	int sd;
79	struct sockaddr *sa;
80{
81	int old, error, af;
82	struct sockaddr_storage myaddr;
83	struct sockaddr_in *sin;
84	struct sockaddr_in6 *sin6;
85	int proto, portrange, portlow;
86	u_int16_t port;
87	u_int32_t salen;
88
89	if (sa == NULL) {
90		salen = sizeof(myaddr);
91		sa = (struct sockaddr *)&myaddr;
92
93		if (getsockname(sd, sa, &salen) == -1)
94			return -1;	/* errno is correctly set */
95
96		af = sa->sa_family;
97		memset(&myaddr, 0, salen);
98	} else
99		af = sa->sa_family;
100
101	if (af == AF_INET) {
102		proto = IPPROTO_IP;
103		portrange = IP_PORTRANGE;
104		portlow = IP_PORTRANGE_LOW;
105		sin = (struct sockaddr_in *)sa;
106		salen = sizeof(struct sockaddr_in);
107		port = sin->sin_port;
108	} else if (af == AF_INET6) {
109		proto = IPPROTO_IPV6;
110		portrange = IPV6_PORTRANGE;
111		portlow = IPV6_PORTRANGE_LOW;
112		sin6 = (struct sockaddr_in6 *)sa;
113		salen = sizeof(struct sockaddr_in6);
114		port = sin6->sin6_port;
115	} else {
116		errno = EPFNOSUPPORT;
117		return (-1);
118	}
119	sa->sa_family = af;
120	sa->sa_len = salen;
121
122	if (port == 0) {
123		u_int32_t oldlen = sizeof(old);
124
125		error = getsockopt(sd, proto, portrange, &old, &oldlen);
126		if (error < 0)
127			return (error);
128
129		error = setsockopt(sd, proto, portrange, &portlow,
130		    sizeof(portlow));
131		if (error < 0)
132			return (error);
133	}
134
135	error = bind(sd, sa, salen);
136
137	if (port == 0) {
138		int saved_errno = errno;
139
140		if (error) {
141			if (setsockopt(sd, proto, portrange, &old,
142			    sizeof(old)) < 0)
143				errno = saved_errno;
144			return (error);
145		}
146
147		if (sa != (struct sockaddr *)&myaddr) {
148			/* Hmm, what did the kernel assign... */
149			if (getsockname(sd, sa, &salen) < 0)
150				errno = saved_errno;
151			return (error);
152		}
153	}
154	return (error);
155}
156
157/*
158 * Bind a socket to a privileged IP port
159 */
160int
161bindresvport(sd, sin)
162	int sd;
163	struct sockaddr_in *sin;
164{
165	return bindresvport_sa(sd, (struct sockaddr *)sin);
166}
167