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 /* 23 * Copyright 1987 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/types.h> 30 #include <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 int 38 bindresvport(int sd, struct sockaddr_in *sin) 39 { 40 int res; 41 static short port; 42 struct sockaddr_in myaddr; 43 int i; 44 45 #define STARTPORT 600 46 #define ENDPORT (IPPORT_RESERVED - 1) 47 #define NPORTS (ENDPORT - STARTPORT + 1) 48 49 if (sin == (struct sockaddr_in *)0) { 50 sin = &myaddr; 51 bzero(sin, sizeof (*sin)); 52 sin->sin_family = AF_INET; 53 } else if (sin->sin_family != AF_INET) { 54 errno = EPFNOSUPPORT; 55 return (-1); 56 } 57 if (port == 0) { 58 port = (getpid() % NPORTS) + STARTPORT; 59 } 60 res = -1; 61 errno = EADDRINUSE; 62 for (i = 0; i < NPORTS && res < 0 && errno == EADDRINUSE; i++) { 63 sin->sin_port = htons(port++); 64 if (port > ENDPORT) { 65 port = STARTPORT; 66 } 67 res = bind(sd, sin, sizeof(struct sockaddr_in)); 68 } 69 return (res); 70 } 71