1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 * 29 * @(#)bindresvport.c 1.8 88/02/08 SMI 30 * @(#)bindresvport.c 2.2 88/07/29 4.0 RPCSRC 31 * $FreeBSD: src/lib/libc/rpc/bindresvport.c,v 1.12 2000/01/26 09:02:42 shin Exp $ 32 * $DragonFly: src/lib/libc/rpc/bindresvport.c,v 1.4 2005/11/13 12:27:04 swildner Exp $ 33 */ 34 35 /* 36 * Copyright (c) 1987 by Sun Microsystems, Inc. 37 * 38 * Portions Copyright(C) 1996, Jason Downs. All rights reserved. 39 */ 40 41 #include "namespace.h" 42 #include <sys/types.h> 43 #include <sys/errno.h> 44 #include <sys/socket.h> 45 #include <netinet/in.h> 46 #include <unistd.h> 47 #include <string.h> 48 #include "un-namespace.h" 49 50 /* 51 * Bind a socket to a privileged IP port 52 */ 53 int 54 bindresvport(int sd, struct sockaddr_in *sin) 55 { 56 return bindresvport_sa(sd, (struct sockaddr *)sin); 57 } 58 59 /* 60 * Bind a socket to a privileged port for whatever protocol. 61 */ 62 int 63 bindresvport_sa(int sd, struct sockaddr *sa) 64 { 65 int old, error, af; 66 struct sockaddr_storage myaddr; 67 struct sockaddr_in *sin; 68 struct sockaddr_in6 *sin6; 69 int proto, portrange, portlow; 70 u_int16_t port; 71 int salen; 72 73 if (sa == NULL) { 74 salen = sizeof(myaddr); 75 sa = (struct sockaddr *)&myaddr; 76 77 if (_getsockname(sd, sa, &salen) == -1) 78 return -1; /* errno is correctly set */ 79 80 af = sa->sa_family; 81 memset(&myaddr, 0, salen); 82 } else 83 af = sa->sa_family; 84 85 if (af == AF_INET) { 86 proto = IPPROTO_IP; 87 portrange = IP_PORTRANGE; 88 portlow = IP_PORTRANGE_LOW; 89 sin = (struct sockaddr_in *)sa; 90 salen = sizeof(struct sockaddr_in); 91 port = sin->sin_port; 92 } else if (af == AF_INET6) { 93 proto = IPPROTO_IPV6; 94 portrange = IPV6_PORTRANGE; 95 portlow = IPV6_PORTRANGE_LOW; 96 sin6 = (struct sockaddr_in6 *)sa; 97 salen = sizeof(struct sockaddr_in6); 98 port = sin6->sin6_port; 99 } else { 100 errno = EPFNOSUPPORT; 101 return (-1); 102 } 103 sa->sa_family = af; 104 sa->sa_len = salen; 105 106 if (port == 0) { 107 int oldlen = sizeof(old); 108 109 error = _getsockopt(sd, proto, portrange, &old, &oldlen); 110 if (error < 0) 111 return (error); 112 113 error = setsockopt(sd, proto, portrange, &portlow, 114 sizeof(portlow)); 115 if (error < 0) 116 return (error); 117 } 118 119 error = _bind(sd, sa, salen); 120 121 if (port == 0) { 122 int saved_errno = errno; 123 124 if (error) { 125 if (_setsockopt(sd, proto, portrange, &old, 126 sizeof(old)) < 0) 127 errno = saved_errno; 128 return (error); 129 } 130 131 if (sa != (struct sockaddr *)&myaddr) { 132 /* Hmm, what did the kernel assign... */ 133 if (_getsockname(sd, sa, &salen) < 0) 134 errno = saved_errno; 135 return (error); 136 } 137 } 138 return (error); 139 } 140