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 #if defined(LIBC_SCCS) && !defined(lint) 34 static char *sccsid2 = "from: @(#)bindresvport.c 1.8 88/02/08 SMI"; 35 static char *sccsid = "from: @(#)bindresvport.c 2.2 88/07/29 4.0 RPCSRC"; 36 #endif 37 /* from: $OpenBSD: bindresvport.c,v 1.7 1996/07/30 16:25:47 downsj Exp $ */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 /* 42 * Copyright (c) 1987 by Sun Microsystems, Inc. 43 * 44 * Portions Copyright(C) 1996, Jason Downs. All rights reserved. 45 */ 46 47 #include "namespace.h" 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 <string.h> 60 #include "un-namespace.h" 61 62 /* 63 * Bind a socket to a privileged IP port 64 */ 65 int 66 bindresvport(int sd, struct sockaddr_in *sin) 67 { 68 return bindresvport_sa(sd, (struct sockaddr *)sin); 69 } 70 71 /* 72 * Bind a socket to a privileged IP port 73 */ 74 int 75 bindresvport_sa(int sd, struct sockaddr *sa) 76 { 77 int old, error, af; 78 struct sockaddr_storage myaddr; 79 struct sockaddr_in *sin; 80 #ifdef INET6 81 struct sockaddr_in6 *sin6; 82 #endif 83 int proto, portrange, portlow; 84 u_int16_t *portp; 85 socklen_t salen; 86 87 if (sa == NULL) { 88 salen = sizeof(myaddr); 89 sa = (struct sockaddr *)&myaddr; 90 91 if (_getsockname(sd, sa, &salen) == -1) 92 return -1; /* errno is correctly set */ 93 94 af = sa->sa_family; 95 memset(sa, 0, salen); 96 } else 97 af = sa->sa_family; 98 99 switch (af) { 100 case AF_INET: 101 proto = IPPROTO_IP; 102 portrange = IP_PORTRANGE; 103 portlow = IP_PORTRANGE_LOW; 104 sin = (struct sockaddr_in *)sa; 105 salen = sizeof(struct sockaddr_in); 106 portp = &sin->sin_port; 107 break; 108 #ifdef INET6 109 case AF_INET6: 110 proto = IPPROTO_IPV6; 111 portrange = IPV6_PORTRANGE; 112 portlow = IPV6_PORTRANGE_LOW; 113 sin6 = (struct sockaddr_in6 *)sa; 114 salen = sizeof(struct sockaddr_in6); 115 portp = &sin6->sin6_port; 116 break; 117 #endif 118 default: 119 errno = EPFNOSUPPORT; 120 return (-1); 121 } 122 sa->sa_family = af; 123 sa->sa_len = salen; 124 125 if (*portp == 0) { 126 socklen_t oldlen = sizeof(old); 127 128 error = _getsockopt(sd, proto, portrange, &old, &oldlen); 129 if (error < 0) 130 return (error); 131 132 error = _setsockopt(sd, proto, portrange, &portlow, 133 sizeof(portlow)); 134 if (error < 0) 135 return (error); 136 } 137 138 error = _bind(sd, sa, salen); 139 140 if (*portp == 0) { 141 int saved_errno = errno; 142 143 if (error < 0) { 144 if (_setsockopt(sd, proto, portrange, &old, 145 sizeof(old)) < 0) 146 errno = saved_errno; 147 return (error); 148 } 149 150 if (sa != (struct sockaddr *)&myaddr) { 151 /* Hmm, what did the kernel assign? */ 152 if (_getsockname(sd, sa, &salen) < 0) 153 errno = saved_errno; 154 return (error); 155 } 156 } 157 return (error); 158 } 159