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/* $NetBSD: bindresvport.c,v 1.25 2013/03/11 20:19:28 tron Exp $ */
/*
* Copyright (c) 2010, Oracle America, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
* * Neither the name of the "Oracle America, Inc." nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char *sccsid = "@(#)bindresvport.c 1.8 88/02/08 SMI";
static char *sccsid = "@(#)bindresvport.c 2.2 88/07/29 4.0 RPCSRC";
#else
__RCSID("$NetBSD: bindresvport.c,v 1.25 2013/03/11 20:19:28 tron Exp $");
#endif
#endif
/*
* Copyright (c) 1987 by Sun Microsystems, Inc.
*/
#include "namespace.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include "svc_fdset.h"
#ifdef __weak_alias
__weak_alias(bindresvport,_bindresvport)
__weak_alias(bindresvport_sa,_bindresvport_sa)
#endif
/*
* Bind a socket to a privileged IP port
*/
int
bindresvport(int sd, struct sockaddr_in *brsin)
{
return bindresvport_sa(sd, (struct sockaddr *)(void *)brsin);
}
/*
* Bind a socket to a privileged IP port
*/
int
bindresvport_sa(int sd, struct sockaddr *sa)
{
int error, old;
struct sockaddr_storage myaddr;
struct sockaddr_in *brsin;
#ifdef INET6
struct sockaddr_in6 *brsin6;
#endif
int proto, portrange, portlow;
u_int16_t *portp;
socklen_t salen;
int af;
if (sa == NULL) {
salen = sizeof(myaddr);
sa = (struct sockaddr *)(void *)&myaddr;
if (getsockname(sd, sa, &salen) == -1)
return -1; /* errno is correctly set */
af = sa->sa_family;
memset(sa, 0, salen);
} else
af = sa->sa_family;
switch (af) {
case AF_INET:
proto = IPPROTO_IP;
portrange = IP_PORTRANGE;
portlow = IP_PORTRANGE_LOW;
brsin = (struct sockaddr_in *)(void *)sa;
salen = sizeof(struct sockaddr_in);
portp = &brsin->sin_port;
break;
#ifdef INET6
case AF_INET6:
proto = IPPROTO_IPV6;
portrange = IPV6_PORTRANGE;
portlow = IPV6_PORTRANGE_LOW;
brsin6 = (struct sockaddr_in6 *)(void *)sa;
salen = sizeof(struct sockaddr_in6);
portp = &brsin6->sin6_port;
break;
#endif
default:
errno = EPFNOSUPPORT;
return (-1);
}
sa->sa_family = af;
sa->sa_len = salen;
if (*portp == 0) {
socklen_t oldlen = sizeof(old);
error = getsockopt(sd, proto, portrange, &old, &oldlen);
if (error < 0)
return (error);
error = setsockopt(sd, proto, portrange, &portlow,
(socklen_t)sizeof(portlow));
if (error < 0)
return (error);
}
error = bind(sd, sa, salen);
if (*portp == 0) {
int saved_errno = errno;
if (error < 0) {
if (setsockopt(sd, proto, portrange, &old,
(socklen_t)sizeof(old)) < 0)
errno = saved_errno;
return (error);
}
if (sa != (struct sockaddr *)(void *)&myaddr) {
/* What did the kernel assign? */
if (getsockname(sd, sa, &salen) < 0)
errno = saved_errno;
return (error);
}
}
return (error);
}
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