1 /* $NetBSD: bindresvport.c,v 1.8 1997/07/21 14:08:21 jtc 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 1.8 1997/07/21 14:08:21 jtc Exp $"); 39 #endif 40 #endif 41 42 /* 43 * Copyright (c) 1987 by Sun Microsystems, Inc. 44 */ 45 46 #include "namespace.h" 47 #include <string.h> 48 #include <unistd.h> 49 #include <sys/types.h> 50 #include <sys/errno.h> 51 #include <sys/socket.h> 52 #include <netinet/in.h> 53 #include <rpc/rpc.h> 54 55 #ifdef __weak_alias 56 __weak_alias(bindresvport,_bindresvport); 57 #endif 58 59 /* 60 * Bind a socket to a privileged IP port 61 */ 62 int 63 bindresvport(sd, sin) 64 int sd; 65 struct sockaddr_in *sin; 66 { 67 int res; 68 static short port; 69 struct sockaddr_in myaddr; 70 int i; 71 72 #define STARTPORT 600 73 #define ENDPORT (IPPORT_RESERVED - 1) 74 #define NPORTS (ENDPORT - STARTPORT + 1) 75 76 if (sin == (struct sockaddr_in *)0) { 77 sin = &myaddr; 78 memset(sin, 0, sizeof (*sin)); 79 sin->sin_len = sizeof(struct sockaddr_in); 80 sin->sin_family = AF_INET; 81 } else if (sin->sin_family != AF_INET) { 82 errno = EPFNOSUPPORT; 83 return (-1); 84 } 85 if (port == 0) { 86 port = (getpid() % NPORTS) + STARTPORT; 87 } 88 res = -1; 89 errno = EADDRINUSE; 90 for (i = 0; i < NPORTS && res < 0 && errno == EADDRINUSE; i++) { 91 sin->sin_port = htons(port++); 92 if (port > ENDPORT) { 93 port = STARTPORT; 94 } 95 res = bind(sd, 96 (struct sockaddr *)sin, sizeof(struct sockaddr_in)); 97 } 98 return (res); 99 } 100