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 30 #if defined(LIBC_SCCS) && !defined(lint) 31 /*static char *sccsid = "from: @(#)bindresvport.c 1.8 88/02/08 SMI";*/ 32 /*static char *sccsid = "from: @(#)bindresvport.c 2.2 88/07/29 4.0 RPCSRC";*/ 33 /*from: OpenBSD: bindresvport.c,v 1.7 1996/07/30 16:25:47 downsj Exp */ 34 static char *rcsid = "$Id: bindresvport.c,v 1.6 1996/12/30 14:12:36 peter Exp $"; 35 #endif 36 37 /* 38 * Copyright (c) 1987 by Sun Microsystems, Inc. 39 * 40 * Portions Copyright(C) 1996, Jason Downs. All rights reserved. 41 */ 42 43 #include <sys/types.h> 44 #include <sys/errno.h> 45 #include <sys/socket.h> 46 #include <netinet/in.h> 47 #include <unistd.h> 48 #include <string.h> 49 50 /* 51 * Bind a socket to a privileged IP port 52 */ 53 int 54 bindresvport(sd, sin) 55 int sd; 56 struct sockaddr_in *sin; 57 { 58 int on, old, error; 59 struct sockaddr_in myaddr; 60 int sinlen = sizeof(struct sockaddr_in); 61 62 if (sin == (struct sockaddr_in *)0) { 63 sin = &myaddr; 64 memset(sin, 0, sinlen); 65 sin->sin_len = sinlen; 66 sin->sin_family = AF_INET; 67 } else if (sin->sin_family != AF_INET) { 68 errno = EPFNOSUPPORT; 69 return (-1); 70 } 71 72 if (sin->sin_port == 0) { 73 int oldlen = sizeof(old); 74 error = getsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 75 &old, &oldlen); 76 if (error < 0) 77 return(error); 78 79 on = IP_PORTRANGE_LOW; 80 error = setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 81 &on, sizeof(on)); 82 if (error < 0) 83 return(error); 84 } 85 86 error = bind(sd, (struct sockaddr *)sin, sinlen); 87 88 if (sin->sin_port == 0) { 89 int saved_errno = errno; 90 91 if (error) { 92 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, 93 &old, sizeof(old)) < 0) 94 errno = saved_errno; 95 return (error); 96 } 97 98 if (sin != &myaddr) { 99 /* Hmm, what did the kernel assign... */ 100 if (getsockname(sd, (struct sockaddr *)sin, 101 &sinlen) < 0) 102 errno = saved_errno; 103 return (error); 104 } 105 } 106 return (error); 107 } 108