NetBSD/lib/libc/rpc/get_myaddress.c

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/* $NetBSD: get_myaddress.c,v 1.5 1997/07/21 14:08:27 jtc 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 = "@(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";
static char *sccsid = "@(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC";
#else
__RCSID("$NetBSD: get_myaddress.c,v 1.5 1997/07/21 14:08:27 jtc Exp $");
#endif
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#endif
/*
* get_myaddress.c
*
* Get client's IP address via ioctl. This avoids using the yellowpages.
* Copyright (C) 1984, Sun Microsystems, Inc.
*/
#include "namespace.h"
#include <rpc/rpc.h>
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#include <rpc/pmap_prot.h>
#include <sys/socket.h>
#include <stdio.h>
#include <unistd.h>
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#include <net/if.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef __weak_alias
__weak_alias(get_myaddress,_get_myaddress);
#endif
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/*
* don't use gethostbyname, which would invoke yellow pages
*/
int
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get_myaddress(addr)
struct sockaddr_in *addr;
{
int s;
char buf[BUFSIZ];
struct ifconf ifc;
struct ifreq ifreq, *ifr;
int len, slop;
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
return (-1);
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}
ifc.ifc_len = sizeof (buf);
ifc.ifc_buf = buf;
if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
(void) close(s);
return (-1);
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}
ifr = ifc.ifc_req;
for (len = ifc.ifc_len; len; len -= sizeof ifreq) {
ifreq = *ifr;
if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
(void) close(s);
return (-1);
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}
if ((ifreq.ifr_flags & IFF_UP) &&
ifr->ifr_addr.sa_family == AF_INET) {
*addr = *((struct sockaddr_in *)&ifr->ifr_addr);
addr->sin_port = htons(PMAPPORT);
break;
}
/*
* Deal with variable length addresses
*/
slop = ifr->ifr_addr.sa_len - sizeof (struct sockaddr);
if (slop > 0) {
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ifr = (struct ifreq *) ((caddr_t)ifr + slop);
len -= slop;
}
ifr++;
}
(void) close(s);
return (0);
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}