NetBSD/lib/libc/rpc/bindresvport.c

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/* $NetBSD: bindresvport.c,v 1.13 1998/11/15 17:32:41 christos Exp $ */
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/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
#include <sys/cdefs.h>
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#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
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__RCSID("$NetBSD: bindresvport.c,v 1.13 1998/11/15 17:32:41 christos Exp $");
#endif
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#endif
/*
* Copyright (c) 1987 by Sun Microsystems, Inc.
*/
#include "namespace.h"
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#include <sys/types.h>
#include <sys/socket.h>
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#include <netinet/in.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <rpc/rpc.h>
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#ifdef __weak_alias
__weak_alias(bindresvport,_bindresvport);
#endif
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/*
* Bind a socket to a privileged IP port
*/
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int
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bindresvport(sd, sin)
int sd;
struct sockaddr_in *sin;
{
int res, old;
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struct sockaddr_in myaddr;
int sinlen = sizeof(struct sockaddr_in);
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if (sin == NULL) {
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sin = &myaddr;
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memset(sin, 0, (size_t)sinlen);
sin->sin_len = sinlen;
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sin->sin_family = AF_INET;
} else if (sin->sin_family != AF_INET) {
errno = EPFNOSUPPORT;
return (-1);
}
if (sin->sin_port == 0) {
int on, oldlen = sizeof(old);
res = getsockopt(sd, IPPROTO_IP, IP_PORTRANGE, &old, &oldlen);
if (res < 0)
return(res);
on = IP_PORTRANGE_LOW;
res = setsockopt(sd, IPPROTO_IP, IP_PORTRANGE, &on, sizeof(on));
if (res < 0)
return(res);
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}
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res = bind(sd, (struct sockaddr *)(void *)sin, sinlen);
if (sin->sin_port == 0) {
int saved_errno = errno;
if (res < 0) {
if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
&old, sizeof(old)) < 0)
errno = saved_errno;
return (res);
}
if (sin != &myaddr) { /* What did the kernel assign? */
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if (getsockname(sd, (struct sockaddr *)(void *)sin, &sinlen)
< 0)
errno = saved_errno;
return (res);
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}
}
return (res);
}