157 lines
4.2 KiB
C
157 lines
4.2 KiB
C
/* $NetBSD: bindresvport.c,v 1.19 2000/07/06 03:03:59 christos Exp $ */
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/*-
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* Copyright (c) 2009, Sun Microsystems, Inc.
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* 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 are met:
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of Sun Microsystems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char *sccsid2 = "from: @(#)bindresvport.c 1.8 88/02/08 SMI";
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static char *sccsid = "from: @(#)bindresvport.c 2.2 88/07/29 4.0 RPCSRC";
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#endif
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/* from: $OpenBSD: bindresvport.c,v 1.7 1996/07/30 16:25:47 downsj Exp $ */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Copyright (c) 1987 by Sun Microsystems, Inc.
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*
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* Portions Copyright(C) 1996, Jason Downs. All rights reserved.
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*/
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#include "namespace.h"
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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 <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <rpc/rpc.h>
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#include <string.h>
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#include "un-namespace.h"
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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(int sd, struct sockaddr_in *sin)
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{
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return bindresvport_sa(sd, (struct sockaddr *)sin);
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}
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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(int sd, struct sockaddr *sa)
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{
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int old, error, af;
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struct sockaddr_storage myaddr;
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struct sockaddr_in *sin;
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#ifdef INET6
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struct sockaddr_in6 *sin6;
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#endif
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int proto, portrange, portlow;
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u_int16_t *portp;
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socklen_t salen;
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if (sa == NULL) {
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salen = 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(sa, 0, salen);
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} else
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af = sa->sa_family;
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switch (af) {
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case AF_INET:
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proto = IPPROTO_IP;
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portrange = IP_PORTRANGE;
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portlow = IP_PORTRANGE_LOW;
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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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break;
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#ifdef INET6
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case AF_INET6:
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proto = IPPROTO_IPV6;
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portrange = IPV6_PORTRANGE;
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portlow = IPV6_PORTRANGE_LOW;
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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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break;
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#endif
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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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sa->sa_len = salen;
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if (*portp == 0) {
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socklen_t oldlen = sizeof(old);
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error = _getsockopt(sd, proto, portrange, &old, &oldlen);
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if (error < 0)
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return (error);
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error = _setsockopt(sd, proto, portrange, &portlow,
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sizeof(portlow));
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if (error < 0)
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return (error);
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}
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error = _bind(sd, sa, salen);
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if (*portp == 0) {
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int saved_errno = errno;
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if (error < 0) {
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if (_setsockopt(sd, proto, portrange, &old,
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sizeof(old)) < 0)
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errno = saved_errno;
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return (error);
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}
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if (sa != (struct sockaddr *)&myaddr) {
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/* Hmm, what did the kernel assign? */
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if (_getsockname(sd, sa, &salen) < 0)
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errno = saved_errno;
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return (error);
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}
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}
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return (error);
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}
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