1/* $NetBSD: bindresvport.c,v 1.21 2003/01/18 11:29:03 thorpej 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 35static char *sccsid = "@(#)bindresvport.c 1.8 88/02/08 SMI"; 36static char *sccsid = "@(#)bindresvport.c 2.2 88/07/29 4.0 RPCSRC"; 37#else 38__RCSID("$NetBSD: bindresvport.c,v 1.21 2003/01/18 11:29:03 thorpej 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#include <rump/rump.h> 60#include <rump/rump_syscalls.h> 61 62/* 63 * Bind a socket to a privileged IP port 64 */ 65int 66bindresvport(sd, brsin) 67 int sd; 68 struct sockaddr_in *brsin; 69{ 70 return bindresvport_sa(sd, (struct sockaddr *)(void *)brsin); 71} 72 73#include <stdio.h> 74/* 75 * Bind a socket to a privileged IP port 76 */ 77int 78bindresvport_sa(sd, sa) 79 int sd; 80 struct sockaddr *sa; 81{ 82 int error, old; 83 struct sockaddr_storage myaddr; 84 struct sockaddr_in *brsin; 85#ifdef INET6 86 struct sockaddr_in6 *brsin6; 87#endif 88 int proto, portrange, portlow; 89 u_int16_t *portp; 90 socklen_t salen; 91 int af; 92 93 if (sa == NULL) { 94 salen = sizeof(myaddr); 95 sa = (struct sockaddr *)(void *)&myaddr; 96 97 if (getsockname(sd, sa, &salen) == -1) 98 return -1; /* errno is correctly set */ 99 100 af = sa->sa_family; 101 memset(sa, 0, salen); 102 } else 103 af = sa->sa_family; 104 105 switch (af) { 106 case AF_INET: 107 proto = IPPROTO_IP; 108 portrange = IP_PORTRANGE; 109 portlow = IP_PORTRANGE_LOW; 110 brsin = (struct sockaddr_in *)(void *)sa; 111 salen = sizeof(struct sockaddr_in); 112 portp = &brsin->sin_port; 113 break; 114#ifdef INET6 115 case AF_INET6: 116 proto = IPPROTO_IPV6; 117 portrange = IPV6_PORTRANGE; 118 portlow = IPV6_PORTRANGE_LOW; 119 brsin6 = (struct sockaddr_in6 *)(void *)sa; 120 salen = sizeof(struct sockaddr_in6); 121 portp = &brsin6->sin6_port; 122 break; 123#endif 124 default: 125 errno = EPFNOSUPPORT; 126 return (-1); 127 } 128 sa->sa_family = af; 129 sa->sa_len = salen; 130 131 if (*portp == 0) { 132 socklen_t oldlen = sizeof(old); 133 134 error = getsockopt(sd, proto, portrange, &old, &oldlen); 135 if (error < 0) 136 return (error); 137 error = setsockopt(sd, proto, portrange, &portlow, 138 sizeof(portlow)); 139 if (error < 0) 140 return (error); 141 } 142 143 error = bind(sd, sa, salen); 144 145 if (*portp == 0) { 146 int saved_errno = errno; 147 148 if (error < 0) { 149 if (setsockopt(sd, proto, portrange, &old, 150 sizeof(old)) < 0) 151 errno = saved_errno; 152 return (error); 153 } 154 155 if (sa != (struct sockaddr *)(void *)&myaddr) { 156 /* What did the kernel assign? */ 157 if (getsockname(sd, sa, &salen) < 0) 158 errno = saved_errno; 159 return (error); 160 } 161 } 162 return (error); 163} 164