1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 #pragma ident "%Z%%M% %I% %E% SMI" 23 24 /* 25 * Copyright 1987 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 #include <sys/types.h> 30 #include <sys/errno.h> 31 #include <sys/socket.h> 32 #include <netinet/in.h> 33 34 /* 35 * Bind a socket to a privileged IP port 36 */ 37 bindresvport(sd, sin) 38 int sd; 39 struct sockaddr_in *sin; 40 { 41 int res; 42 static short port; 43 struct sockaddr_in myaddr; 44 extern int errno; 45 int i; 46 47 #define STARTPORT 600 48 #define ENDPORT (IPPORT_RESERVED - 1) 49 #define NPORTS (ENDPORT - STARTPORT + 1) 50 51 if (sin == (struct sockaddr_in *)0) { 52 sin = &myaddr; 53 bzero(sin, sizeof (*sin)); 54 sin->sin_family = AF_INET; 55 } else if (sin->sin_family != AF_INET) { 56 errno = EPFNOSUPPORT; 57 return (-1); 58 } 59 if (port == 0) { 60 port = (getpid() % NPORTS) + STARTPORT; 61 } 62 res = -1; 63 errno = EADDRINUSE; 64 for (i = 0; i < NPORTS && res < 0 && errno == EADDRINUSE; i++) { 65 sin->sin_port = htons(port++); 66 if (port > ENDPORT) { 67 port = STARTPORT; 68 } 69 res = bind(sd, sin, sizeof(struct sockaddr_in)); 70 } 71 return (res); 72 } 73