rresvport.c revision 124208
154359Sroberto/* 2182007Sroberto * Copyright (c) 1995, 1996, 1998 Theo de Raadt. All rights reserved. 3285612Sdelphij * Copyright (c) 1983, 1993, 1994 4182007Sroberto * The Regents of the University of California. All rights reserved. 554359Sroberto * 654359Sroberto * Redistribution and use in source and binary forms, with or without 754359Sroberto * modification, are permitted provided that the following conditions 8285612Sdelphij * are met: 9285612Sdelphij * 1. Redistributions of source code must retain the above copyright 1054359Sroberto * notice, this list of conditions and the following disclaimer. 11182007Sroberto * 2. Redistributions in binary form must reproduce the above copyright 12182007Sroberto * notice, this list of conditions and the following disclaimer in the 13182007Sroberto * documentation and/or other materials provided with the distribution. 14182007Sroberto * 3. Neither the name of the University nor the names of its contributors 15182007Sroberto * may be used to endorse or promote products derived from this software 16182007Sroberto * without specific prior written permission. 17182007Sroberto * 18182007Sroberto * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19182007Sroberto * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20182007Sroberto * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21182007Sroberto * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22182007Sroberto * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23182007Sroberto * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24182007Sroberto * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25182007Sroberto * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26182007Sroberto * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27182007Sroberto * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28182007Sroberto * SUCH DAMAGE. 29182007Sroberto */ 30182007Sroberto 31182007Sroberto#include "includes.h" 32182007Sroberto 33182007Sroberto#ifndef HAVE_RRESVPORT_AF 34182007Sroberto 3554359Sroberto#if defined(LIBC_SCCS) && !defined(lint) 3654359Srobertostatic char *rcsid = "$OpenBSD: rresvport.c,v 1.6 2003/06/03 02:11:35 deraadt Exp $"; 3754359Sroberto#endif /* LIBC_SCCS and not lint */ 3854359Sroberto 3954359Sroberto#include "includes.h" 4054359Sroberto 4154359Sroberto#if 0 4254359Srobertoint 4354359Srobertorresvport(alport) 4454359Sroberto int *alport; 4554359Sroberto{ 4654359Sroberto return rresvport_af(alport, AF_INET); 4754359Sroberto} 4854359Sroberto#endif 4954359Sroberto 5054359Srobertoint 5154359Srobertorresvport_af(int *alport, sa_family_t af) 5254359Sroberto{ 5354359Sroberto struct sockaddr_storage ss; 5454359Sroberto struct sockaddr *sa; 5554359Sroberto u_int16_t *portp; 5654359Sroberto int s; 5754359Sroberto socklen_t salen; 5854359Sroberto 5954359Sroberto memset(&ss, '\0', sizeof ss); 6054359Sroberto sa = (struct sockaddr *)&ss; 6154359Sroberto 6254359Sroberto switch (af) { 6354359Sroberto case AF_INET: 6454359Sroberto salen = sizeof(struct sockaddr_in); 6554359Sroberto portp = &((struct sockaddr_in *)sa)->sin_port; 6654359Sroberto break; 6754359Sroberto case AF_INET6: 68285612Sdelphij salen = sizeof(struct sockaddr_in6); 6954359Sroberto portp = &((struct sockaddr_in6 *)sa)->sin6_port; 7054359Sroberto break; 7154359Sroberto default: 7254359Sroberto errno = EPFNOSUPPORT; 7354359Sroberto return (-1); 7454359Sroberto } 7554359Sroberto sa->sa_family = af; 7654359Sroberto 7754359Sroberto s = socket(af, SOCK_STREAM, 0); 7854359Sroberto if (s < 0) 7954359Sroberto return (-1); 8054359Sroberto 8154359Sroberto *portp = htons(*alport); 8254359Sroberto if (*alport < IPPORT_RESERVED - 1) { 8354359Sroberto if (bind(s, sa, salen) >= 0) 8454359Sroberto return (s); 8554359Sroberto if (errno != EADDRINUSE) { 8654359Sroberto (void)close(s); 8754359Sroberto return (-1); 8854359Sroberto } 8954359Sroberto } 9054359Sroberto 9154359Sroberto *portp = 0; 9254359Sroberto sa->sa_family = af; 9354359Sroberto if (bindresvport_sa(s, sa) == -1) { 9454359Sroberto (void)close(s); 9554359Sroberto return (-1); 9654359Sroberto } 9754359Sroberto *alport = ntohs(*portp); 9854359Sroberto return (s); 9954359Sroberto} 10054359Sroberto 10154359Sroberto#endif /* HAVE_RRESVPORT_AF */ 10254359Sroberto