1 /* $NetBSD: bindresvport.c,v 1.19 2000/07/06 03:03:59 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2009, Sun Microsystems, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * - Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * - Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * - Neither the name of Sun Microsystems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #if defined(LIBC_SCCS) && !defined(lint) 32 static char *sccsid2 = "from: @(#)bindresvport.c 1.8 88/02/08 SMI"; 33 static char *sccsid = "from: @(#)bindresvport.c 2.2 88/07/29 4.0 RPCSRC"; 34 #endif 35 /* from: $OpenBSD: bindresvport.c,v 1.7 1996/07/30 16:25:47 downsj Exp $ */ 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 /* 40 * Copyright (c) 1987 by Sun Microsystems, Inc. 41 * 42 * Portions Copyright(C) 1996, Jason Downs. All rights reserved. 43 */ 44 45 #include "namespace.h" 46 #include <sys/types.h> 47 #include <sys/socket.h> 48 49 #include <netinet/in.h> 50 51 #include <errno.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 #include <rpc/rpc.h> 56 57 #include <string.h> 58 #include "un-namespace.h" 59 60 /* 61 * Bind a socket to a privileged IP port 62 */ 63 int 64 bindresvport(int sd, struct sockaddr_in *sin) 65 { 66 return bindresvport_sa(sd, (struct sockaddr *)sin); 67 } 68 69 /* 70 * Bind a socket to a privileged IP port 71 */ 72 int 73 bindresvport_sa(int sd, struct sockaddr *sa) 74 { 75 int old, error, af; 76 struct sockaddr_storage myaddr; 77 struct sockaddr_in *sin; 78 #ifdef INET6 79 struct sockaddr_in6 *sin6; 80 #endif 81 int proto, portrange, portlow; 82 u_int16_t *portp; 83 socklen_t salen; 84 85 if (sa == NULL) { 86 salen = sizeof(myaddr); 87 sa = (struct sockaddr *)&myaddr; 88 89 if (_getsockname(sd, sa, &salen) == -1) 90 return -1; /* errno is correctly set */ 91 92 af = sa->sa_family; 93 memset(sa, 0, salen); 94 } else 95 af = sa->sa_family; 96 97 switch (af) { 98 case AF_INET: 99 proto = IPPROTO_IP; 100 portrange = IP_PORTRANGE; 101 portlow = IP_PORTRANGE_LOW; 102 sin = (struct sockaddr_in *)sa; 103 salen = sizeof(struct sockaddr_in); 104 portp = &sin->sin_port; 105 break; 106 #ifdef INET6 107 case AF_INET6: 108 proto = IPPROTO_IPV6; 109 portrange = IPV6_PORTRANGE; 110 portlow = IPV6_PORTRANGE_LOW; 111 sin6 = (struct sockaddr_in6 *)sa; 112 salen = sizeof(struct sockaddr_in6); 113 portp = &sin6->sin6_port; 114 break; 115 #endif 116 default: 117 errno = EPFNOSUPPORT; 118 return (-1); 119 } 120 sa->sa_family = af; 121 sa->sa_len = salen; 122 123 if (*portp == 0) { 124 socklen_t oldlen = sizeof(old); 125 126 error = _getsockopt(sd, proto, portrange, &old, &oldlen); 127 if (error < 0) 128 return (error); 129 130 error = _setsockopt(sd, proto, portrange, &portlow, 131 sizeof(portlow)); 132 if (error < 0) 133 return (error); 134 } 135 136 error = _bind(sd, sa, salen); 137 138 if (*portp == 0) { 139 int saved_errno = errno; 140 141 if (error < 0) { 142 if (_setsockopt(sd, proto, portrange, &old, 143 sizeof(old)) < 0) 144 errno = saved_errno; 145 return (error); 146 } 147 148 if (sa != (struct sockaddr *)&myaddr) { 149 /* Hmm, what did the kernel assign? */ 150 if (_getsockname(sd, sa, &salen) < 0) 151 errno = saved_errno; 152 return (error); 153 } 154 } 155 return (error); 156 } 157