1 /* $NetBSD: bindresvport.c,v 1.19 2000/07/06 03:03:59 christos Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 2009, Sun Microsystems, Inc.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 * - Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 * - Redistributions in binary form must reproduce the above copyright notice,
14 * this list of conditions and the following disclaimer in the documentation
15 * and/or other materials provided with the distribution.
16 * - Neither the name of Sun Microsystems, Inc. nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 /* from: $OpenBSD: bindresvport.c,v 1.7 1996/07/30 16:25:47 downsj Exp $ */
34 /*
35 * Copyright (c) 1987 by Sun Microsystems, Inc.
36 *
37 * Portions Copyright(C) 1996, Jason Downs. All rights reserved.
38 */
39
40 #include "namespace.h"
41 #include <sys/types.h>
42 #include <sys/socket.h>
43
44 #include <netinet/in.h>
45
46 #include <errno.h>
47 #include <string.h>
48 #include <unistd.h>
49
50 #include <rpc/rpc.h>
51
52 #include <string.h>
53 #include "un-namespace.h"
54
55 /*
56 * Bind a socket to a privileged IP port
57 */
58 int
bindresvport(int sd,struct sockaddr_in * sin)59 bindresvport(int sd, struct sockaddr_in *sin)
60 {
61 return bindresvport_sa(sd, (struct sockaddr *)sin);
62 }
63
64 /*
65 * Bind a socket to a privileged IP port
66 */
67 int
bindresvport_sa(int sd,struct sockaddr * sa)68 bindresvport_sa(int sd, struct sockaddr *sa)
69 {
70 int old, error, af;
71 struct sockaddr_storage myaddr;
72 struct sockaddr_in *sin;
73 #ifdef INET6
74 struct sockaddr_in6 *sin6;
75 #endif
76 int proto, portrange, portlow;
77 u_int16_t *portp;
78 socklen_t salen;
79
80 if (sa == NULL) {
81 salen = sizeof(myaddr);
82 sa = (struct sockaddr *)&myaddr;
83
84 if (_getsockname(sd, sa, &salen) == -1)
85 return -1; /* errno is correctly set */
86
87 af = sa->sa_family;
88 memset(sa, 0, salen);
89 } else
90 af = sa->sa_family;
91
92 switch (af) {
93 case AF_INET:
94 proto = IPPROTO_IP;
95 portrange = IP_PORTRANGE;
96 portlow = IP_PORTRANGE_LOW;
97 sin = (struct sockaddr_in *)sa;
98 salen = sizeof(struct sockaddr_in);
99 portp = &sin->sin_port;
100 break;
101 #ifdef INET6
102 case AF_INET6:
103 proto = IPPROTO_IPV6;
104 portrange = IPV6_PORTRANGE;
105 portlow = IPV6_PORTRANGE_LOW;
106 sin6 = (struct sockaddr_in6 *)sa;
107 salen = sizeof(struct sockaddr_in6);
108 portp = &sin6->sin6_port;
109 break;
110 #endif
111 default:
112 errno = EPFNOSUPPORT;
113 return (-1);
114 }
115 sa->sa_family = af;
116 sa->sa_len = salen;
117
118 if (*portp == 0) {
119 socklen_t oldlen = sizeof(old);
120
121 error = _getsockopt(sd, proto, portrange, &old, &oldlen);
122 if (error < 0)
123 return (error);
124
125 error = _setsockopt(sd, proto, portrange, &portlow,
126 sizeof(portlow));
127 if (error < 0)
128 return (error);
129 }
130
131 error = _bind(sd, sa, salen);
132
133 if (*portp == 0) {
134 int saved_errno = errno;
135
136 if (error < 0) {
137 if (_setsockopt(sd, proto, portrange, &old,
138 sizeof(old)) < 0)
139 errno = saved_errno;
140 return (error);
141 }
142
143 if (sa != (struct sockaddr *)&myaddr) {
144 /* Hmm, what did the kernel assign? */
145 if (_getsockname(sd, sa, &salen) < 0)
146 errno = saved_errno;
147 return (error);
148 }
149 }
150 return (error);
151 }
152