1 /* $NetBSD: bindresvport.c,v 1.19 2000/07/06 03:03:59 christos 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 #if defined(LIBC_SCCS) && !defined(lint) 33 /*static char *sccsid = "from: @(#)bindresvport.c 1.8 88/02/08 SMI";*/ 34 /*static char *sccsid = "from: @(#)bindresvport.c 2.2 88/07/29 4.0 RPCSRC";*/ 35 /*from: OpenBSD: bindresvport.c,v 1.7 1996/07/30 16:25:47 downsj Exp */ 36 #endif 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 /* 41 * Copyright (c) 1987 by Sun Microsystems, Inc. 42 * 43 * Portions Copyright(C) 1996, Jason Downs. All rights reserved. 44 */ 45 46 #include "namespace.h" 47 #include <sys/types.h> 48 #include <sys/socket.h> 49 50 #include <netinet/in.h> 51 52 #include <errno.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 #include <rpc/rpc.h> 57 58 #include <string.h> 59 #include "un-namespace.h" 60 61 /* 62 * Bind a socket to a privileged IP port 63 */ 64 int 65 bindresvport(sd, sin) 66 int sd; 67 struct sockaddr_in *sin; 68 { 69 return bindresvport_sa(sd, (struct sockaddr *)sin); 70 } 71 72 /* 73 * Bind a socket to a privileged IP port 74 */ 75 int 76 bindresvport_sa(sd, sa) 77 int sd; 78 struct sockaddr *sa; 79 { 80 int old, error, af; 81 struct sockaddr_storage myaddr; 82 struct sockaddr_in *sin; 83 #ifdef INET6 84 struct sockaddr_in6 *sin6; 85 #endif 86 int proto, portrange, portlow; 87 u_int16_t *portp; 88 socklen_t salen; 89 90 if (sa == NULL) { 91 salen = sizeof(myaddr); 92 sa = (struct sockaddr *)&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 sin = (struct sockaddr_in *)sa; 108 salen = sizeof(struct sockaddr_in); 109 portp = &sin->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 sin6 = (struct sockaddr_in6 *)sa; 117 salen = sizeof(struct sockaddr_in6); 118 portp = &sin6->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); 134 135 error = _setsockopt(sd, proto, portrange, &portlow, 136 sizeof(portlow)); 137 if (error < 0) 138 return (error); 139 } 140 141 error = _bind(sd, sa, salen); 142 143 if (*portp == 0) { 144 int saved_errno = errno; 145 146 if (error < 0) { 147 if (_setsockopt(sd, proto, portrange, &old, 148 sizeof(old)) < 0) 149 errno = saved_errno; 150 return (error); 151 } 152 153 if (sa != (struct sockaddr *)&myaddr) { 154 /* Hmm, what did the kernel assign? */ 155 if (_getsockname(sd, sa, &salen) < 0) 156 errno = saved_errno; 157 return (error); 158 } 159 } 160 return (error); 161 } 162