get_myaddress.c

/* @(#)get_myaddress.c	2.1 88/07/29 4.0 RPCSRC */
/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * All rights reserved.
 *
 * 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.
 */
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";
#endif

/*
 * get_myaddress.c
 *
 * Get client's IP address via ioctl.  This avoids using the yellowpages.
 */

#ifdef GSSAPI_KRB5
#include <string.h>
#include <gssrpc/types.h>
#include <gssrpc/rpc.h>
#include <gssrpc/pmap_prot.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <krb5.h>
/*
 * don't use gethostbyname, which would invoke yellow pages
 */
int
get_myaddress(struct sockaddr_in *addr)
{
	memset(addr, 0, sizeof(*addr));
	addr->sin_family = AF_INET;
	addr->sin_port = htons(PMAPPORT);
	addr->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
	return (0);
}
#else /* !GSSAPI_KRB5 */
#include <gssrpc/types.h>
#include <gssrpc/pmap_prot.h>
#include <sys/socket.h>
#if defined(sun)
#include <sys/sockio.h>
#endif
#include <stdio.h>
#ifdef OSF1
#include <net/route.h>
#include <sys/mbuf.h>
#endif
#include <net/if.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <netinet/in.h>

/*
 * don't use gethostbyname, which would invoke yellow pages
 */
get_myaddress(struct sockaddr_in *addr)
{
	int s;
	char buf[256 * sizeof (struct ifreq)];
	struct ifconf ifc;
	struct ifreq ifreq, *ifr;
	int len;

	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
	    perror("get_myaddress: socket");
	    exit(1);
	}
	set_cloexec_fd(s);
	ifc.ifc_len = sizeof (buf);
	ifc.ifc_buf = buf;
	if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
		perror("get_myaddress: ioctl (get interface configuration)");
		exit(1);
	}
	ifr = ifc.ifc_req;
	for (len = ifc.ifc_len; len; len -= sizeof ifreq) {
		ifreq = *ifr;
		if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
			perror("get_myaddress: ioctl");
			exit(1);
		}
		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;
		}
		ifr++;
	}
	(void) close(s);
}
#endif /* !GSSAPI_KRB5 */