113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
/* This file has be substantially modified from the original OpenBSD source */
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/* $OpenBSD: bindresvport.c,v 1.15 2003/05/20 22:42:35 deraadt Exp $ */
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/*
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* Copyright 1996, Jason Downs. All rights reserved.
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* Copyright 1998, Theo de Raadt. All rights reserved.
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* Copyright 2000, Damien Miller. 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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#ifndef HAVE_BINDRESVPORT_SA
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#include "includes.h"
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#define STARTPORT 600
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#define ENDPORT (IPPORT_RESERVED - 1)
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#define NPORTS (ENDPORT - STARTPORT + 1)
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/*
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* Bind a socket to a privileged IP port
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*/
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int
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bindresvport_sa(sd, sa)
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int sd;
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struct sockaddr *sa;
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{
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int error, af;
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struct sockaddr_storage myaddr;
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struct sockaddr_in *sin;
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struct sockaddr_in6 *sin6;
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u_int16_t *portp;
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u_int16_t port;
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socklen_t salen;
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int i;
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if (sa == NULL) {
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memset(&myaddr, 0, sizeof(myaddr));
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sa = (struct sockaddr *)&myaddr;
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if (getsockname(sd, sa, &salen) == -1)
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return -1; /* errno is correctly set */
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af = sa->sa_family;
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memset(&myaddr, 0, salen);
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} else
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af = sa->sa_family;
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if (af == AF_INET) {
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sin = (struct sockaddr_in *)sa;
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salen = sizeof(struct sockaddr_in);
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portp = &sin->sin_port;
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} else if (af == AF_INET6) {
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sin6 = (struct sockaddr_in6 *)sa;
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salen = sizeof(struct sockaddr_in6);
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portp = &sin6->sin6_port;
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} else {
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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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port = ntohs(*portp);
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if (port == 0)
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port = (arc4random() % NPORTS) + STARTPORT;
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/* Avoid warning */
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error = -1;
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for(i = 0; i < NPORTS; i++) {
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*portp = htons(port);
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error = bind(sd, sa, salen);
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/* Terminate on success */
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if (error == 0)
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break;
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/* Terminate on errors, except "address already in use" */
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if ((error < 0) && !((errno == EADDRINUSE) || (errno == EINVAL)))
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break;
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port++;
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if (port > ENDPORT)
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port = STARTPORT;
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}
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return (error);
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}
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#endif /* HAVE_BINDRESVPORT_SA */
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