bindresvport.c revision 1.9 
1/*	$NetBSD: bindresvport.c,v 1.9 1998/01/14 11:04:18 lukem Exp $	*/
2
3/*
4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part.  Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
10 *
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 *
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
18 *
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
22 *
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
26 *
27 * Sun Microsystems, Inc.
28 * 2550 Garcia Avenue
29 * Mountain View, California  94043
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char *sccsid = "@(#)bindresvport.c 1.8 88/02/08 SMI";
36static char *sccsid = "@(#)bindresvport.c	2.2 88/07/29 4.0 RPCSRC";
37#else
38__RCSID("$NetBSD: bindresvport.c,v 1.9 1998/01/14 11:04:18 lukem Exp $");
39#endif
40#endif
41
42/*
43 * Copyright (c) 1987 by Sun Microsystems, Inc.
44 */
45
46#include "namespace.h"
47#include <string.h>
48#include <unistd.h>
49#include <sys/types.h>
50#include <sys/errno.h>
51#include <sys/socket.h>
52#include <netinet/in.h>
53#include <rpc/rpc.h>
54
55#ifdef __weak_alias
56__weak_alias(bindresvport,_bindresvport);
57#endif
58
59/*
60 * Bind a socket to a privileged IP port
61 */
62int
63bindresvport(sd, sin)
64	int sd;
65	struct sockaddr_in *sin;
66{
67	int res, old;
68	struct sockaddr_in myaddr;
69	int sinlen = sizeof(struct sockaddr_in);
70
71	if (sin == NULL) {
72		sin = &myaddr;
73		memset(sin, 0, sinlen);
74		sin->sin_len = sinlen;
75		sin->sin_family = AF_INET;
76	} else if (sin->sin_family != AF_INET) {
77		errno = EPFNOSUPPORT;
78		return (-1);
79	}
80
81	if (sin->sin_port == 0) {
82		int on, oldlen = sizeof(old);
83
84		res = getsockopt(sd, IPPROTO_IP, IP_PORTRANGE, &old, &oldlen);
85		if (res < 0)
86			return(res);
87		on = IP_PORTRANGE_LOW;
88		res = setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, &on, sizeof(on));
89		if (res < 0)
90			return(res);
91	}
92
93	res = bind(sd, (struct sockaddr *)sin, sinlen);
94
95	if (sin->sin_port == 0) {
96		int saved_errno = errno;
97
98		if (res < 0) {
99			if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
100			    &old, sizeof(old)) < 0)
101				errno = saved_errno;
102			return (res);
103		}
104
105		if (sin != &myaddr) {	/* What did the kernel assign? */
106			if (getsockname(sd, (struct sockaddr *)sin, &sinlen)
107			    < 0)
108				errno = saved_errno;
109			return (res);
110		}
111	}
112	return (res);
113}
114