1 /* $NetBSD: bindresvport.c,v 1.4 1995/04/14 19:48:20 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 #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 static char *rcsid = "$NetBSD: bindresvport.c,v 1.4 1995/04/14 19:48:20 jtc Exp $"; 36 #endif 37 38 /* 39 * Copyright (c) 1987 by Sun Microsystems, Inc. 40 */ 41 42 #include <string.h> 43 #include <sys/types.h> 44 #include <sys/errno.h> 45 #include <sys/socket.h> 46 #include <netinet/in.h> 47 48 /* 49 * Bind a socket to a privileged IP port 50 */ 51 bindresvport(sd, sin) 52 int sd; 53 struct sockaddr_in *sin; 54 { 55 int res; 56 static short port; 57 struct sockaddr_in myaddr; 58 int i; 59 60 #define STARTPORT 600 61 #define ENDPORT (IPPORT_RESERVED - 1) 62 #define NPORTS (ENDPORT - STARTPORT + 1) 63 64 if (sin == (struct sockaddr_in *)0) { 65 sin = &myaddr; 66 memset(sin, 0, sizeof (*sin)); 67 sin->sin_family = AF_INET; 68 } else if (sin->sin_family != AF_INET) { 69 errno = EPFNOSUPPORT; 70 return (-1); 71 } 72 if (port == 0) { 73 port = (getpid() % NPORTS) + STARTPORT; 74 } 75 res = -1; 76 errno = EADDRINUSE; 77 for (i = 0; i < NPORTS && res < 0 && errno == EADDRINUSE; i++) { 78 sin->sin_port = htons(port++); 79 if (port > ENDPORT) { 80 port = STARTPORT; 81 } 82 res = bind(sd, 83 (struct sockaddr *)sin, sizeof(struct sockaddr_in)); 84 } 85 return (res); 86 } 87