1 /* $NetBSD: bindresvport.c,v 1.23 2012/03/20 17:14:50 matt 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 35 static char *sccsid = "@(#)bindresvport.c 1.8 88/02/08 SMI"; 36 static char *sccsid = "@(#)bindresvport.c 2.2 88/07/29 4.0 RPCSRC"; 37 #else 38 __RCSID("$NetBSD: bindresvport.c,v 1.23 2012/03/20 17:14:50 matt 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 #ifdef __weak_alias 60 __weak_alias(bindresvport,_bindresvport) 61 __weak_alias(bindresvport_sa,_bindresvport_sa) 62 #endif 63 64 /* 65 * Bind a socket to a privileged IP port 66 */ 67 int 68 bindresvport(int sd, struct sockaddr_in *brsin) 69 { 70 return bindresvport_sa(sd, (struct sockaddr *)(void *)brsin); 71 } 72 73 /* 74 * Bind a socket to a privileged IP port 75 */ 76 int 77 bindresvport_sa(int sd, struct sockaddr *sa) 78 { 79 int error, old; 80 struct sockaddr_storage myaddr; 81 struct sockaddr_in *brsin; 82 #ifdef INET6 83 struct sockaddr_in6 *brsin6; 84 #endif 85 int proto, portrange, portlow; 86 u_int16_t *portp; 87 socklen_t salen; 88 int af; 89 90 if (sa == NULL) { 91 salen = sizeof(myaddr); 92 sa = (struct sockaddr *)(void *)&myaddr; 93 94 if (getsockname(sd, sa, &salen) == -1) 95 return -1; /* errno is correctly set */ 96 97 af = sa->sa_family; 98 memset(sa, 0, salen); 99 } else 100 af = sa->sa_family; 101 102 switch (af) { 103 case AF_INET: 104 proto = IPPROTO_IP; 105 portrange = IP_PORTRANGE; 106 portlow = IP_PORTRANGE_LOW; 107 brsin = (struct sockaddr_in *)(void *)sa; 108 salen = sizeof(struct sockaddr_in); 109 portp = &brsin->sin_port; 110 break; 111 #ifdef INET6 112 case AF_INET6: 113 proto = IPPROTO_IPV6; 114 portrange = IPV6_PORTRANGE; 115 portlow = IPV6_PORTRANGE_LOW; 116 brsin6 = (struct sockaddr_in6 *)(void *)sa; 117 salen = sizeof(struct sockaddr_in6); 118 portp = &brsin6->sin6_port; 119 break; 120 #endif 121 default: 122 errno = EPFNOSUPPORT; 123 return (-1); 124 } 125 sa->sa_family = af; 126 sa->sa_len = salen; 127 128 if (*portp == 0) { 129 socklen_t oldlen = sizeof(old); 130 131 error = getsockopt(sd, proto, portrange, &old, &oldlen); 132 if (error < 0) 133 return (error); 134 error = setsockopt(sd, proto, portrange, &portlow, 135 (socklen_t)sizeof(portlow)); 136 if (error < 0) 137 return (error); 138 } 139 140 error = bind(sd, sa, salen); 141 142 if (*portp == 0) { 143 int saved_errno = errno; 144 145 if (error < 0) { 146 if (setsockopt(sd, proto, portrange, &old, 147 (socklen_t)sizeof(old)) < 0) 148 errno = saved_errno; 149 return (error); 150 } 151 152 if (sa != (struct sockaddr *)(void *)&myaddr) { 153 /* What did the kernel assign? */ 154 if (getsockname(sd, sa, &salen) < 0) 155 errno = saved_errno; 156 return (error); 157 } 158 } 159 return (error); 160 } 161