/* $OpenBSD: rresvport.c,v 1.9 2005/11/10 10:00:17 espie Exp $ */
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/*
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* Copyright (c) 1995, 1996, 1998 Theo de Raadt. All rights reserved.
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* Copyright (c) 1983, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* OPENBSD ORIGINAL: lib/libc/net/rresvport.c */
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#include "includes.h"
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#ifndef HAVE_RRESVPORT_AF
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#if 0
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int
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rresvport(int *alport)
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{
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return rresvport_af(alport, AF_INET);
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}
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#endif
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int
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rresvport_af(int *alport, sa_family_t af)
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{
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struct sockaddr_storage ss;
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struct sockaddr *sa;
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u_int16_t *portp;
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int s;
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socklen_t salen;
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memset(&ss, '\0', sizeof ss);
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sa = (struct sockaddr *)&ss;
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switch (af) {
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case AF_INET:
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salen = sizeof(struct sockaddr_in);
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portp = &((struct sockaddr_in *)sa)->sin_port;
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break;
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case AF_INET6:
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salen = sizeof(struct sockaddr_in6);
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portp = &((struct sockaddr_in6 *)sa)->sin6_port;
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break;
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default:
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errno = EPFNOSUPPORT;
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return (-1);
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}
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sa->sa_family = af;
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s = socket(af, SOCK_STREAM, 0);
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if (s < 0)
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return (-1);
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*portp = htons(*alport);
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if (*alport < IPPORT_RESERVED - 1) {
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if (bind(s, sa, salen) >= 0)
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return (s);
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if (errno != EADDRINUSE) {
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(void)close(s);
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return (-1);
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}
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}
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*portp = 0;
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sa->sa_family = af;
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if (bindresvport_sa(s, sa) == -1) {
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(void)close(s);
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return (-1);
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}
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*alport = ntohs(*portp);
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return (s);
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}
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#endif /* HAVE_RRESVPORT_AF */
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