1/*	$NetBSD: bindresvport.c,v 1.21 2003/01/18 11:29:03 thorpej 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 1.21 2003/01/18 11:29:03 thorpej Exp $");
39#endif
40#endif
41
42/*
43 * Copyright (c) 1987 by Sun Microsystems, Inc.
44 */
45
46#include "namespace.h"
47
48#include <sys/types.h>
49#include <sys/socket.h>
50
51#include <netinet/in.h>
52
53#include <errno.h>
54#include <string.h>
55#include <unistd.h>
56
57#include <rpc/rpc.h>
58
59#include <rump/rump.h>
60#include <rump/rump_syscalls.h>
61
62/*
63 * Bind a socket to a privileged IP port
64 */
65int
66bindresvport(sd, brsin)
67	int sd;
68	struct sockaddr_in *brsin;
69{
70	return bindresvport_sa(sd, (struct sockaddr *)(void *)brsin);
71}
72
73#include <stdio.h>
74/*
75 * Bind a socket to a privileged IP port
76 */
77int
78bindresvport_sa(sd, sa)
79	int sd;
80	struct sockaddr *sa;
81{
82	int error, old;
83	struct sockaddr_storage myaddr;
84	struct sockaddr_in *brsin;
85#ifdef INET6
86	struct sockaddr_in6 *brsin6;
87#endif
88	int proto, portrange, portlow;
89	u_int16_t *portp;
90	socklen_t salen;
91	int af;
92
93	if (sa == NULL) {
94		salen = sizeof(myaddr);
95		sa = (struct sockaddr *)(void *)&myaddr;
96
97		if (getsockname(sd, sa, &salen) == -1)
98			return -1;	/* errno is correctly set */
99
100		af = sa->sa_family;
101		memset(sa, 0, salen);
102	} else
103		af = sa->sa_family;
104
105	switch (af) {
106	case AF_INET:
107		proto = IPPROTO_IP;
108		portrange = IP_PORTRANGE;
109		portlow = IP_PORTRANGE_LOW;
110		brsin = (struct sockaddr_in *)(void *)sa;
111		salen = sizeof(struct sockaddr_in);
112		portp = &brsin->sin_port;
113		break;
114#ifdef INET6
115	case AF_INET6:
116		proto = IPPROTO_IPV6;
117		portrange = IPV6_PORTRANGE;
118		portlow = IPV6_PORTRANGE_LOW;
119		brsin6 = (struct sockaddr_in6 *)(void *)sa;
120		salen = sizeof(struct sockaddr_in6);
121		portp = &brsin6->sin6_port;
122		break;
123#endif
124	default:
125		errno = EPFNOSUPPORT;
126		return (-1);
127	}
128	sa->sa_family = af;
129	sa->sa_len = salen;
130
131	if (*portp == 0) {
132		socklen_t oldlen = sizeof(old);
133
134		error = getsockopt(sd, proto, portrange, &old, &oldlen);
135		if (error < 0)
136			return (error);
137		error = setsockopt(sd, proto, portrange, &portlow,
138		    sizeof(portlow));
139		if (error < 0)
140			return (error);
141	}
142
143	error = bind(sd, sa, salen);
144
145	if (*portp == 0) {
146		int saved_errno = errno;
147
148		if (error < 0) {
149			if (setsockopt(sd, proto, portrange, &old,
150			    sizeof(old)) < 0)
151				errno = saved_errno;
152			return (error);
153		}
154
155		if (sa != (struct sockaddr *)(void *)&myaddr) {
156			/* What did the kernel assign? */
157			if (getsockname(sd, sa, &salen) < 0)
158				errno = saved_errno;
159			return (error);
160		}
161	}
162	return (error);
163}
164