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/* $OpenBSD: get_myaddress.c,v 1.14 2013/11/12 06:09:50 deraadt 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.
*/
/*
* get_myaddress.c
*
* Get client's IP address via ioctl. This avoids using the yellowpages.
*/
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <rpc/pmap_prot.h>
#include <rpc/rpc.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <net/if.h>
#include <netinet/in.h>
#include <ifaddrs.h>
/*
* don't use gethostbyname, which would invoke yellow pages
*
* Avoid loopback interfaces. We return information from a loopback
* interface only if there are no other possible interfaces.
*/
int
get_myaddress(struct sockaddr_in *addr)
{
struct ifaddrs *ifap, *ifa;
int loopback = 0, gotit = 0;
if (getifaddrs(&ifap) != 0)
return (-1);
again:
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if ((ifa->ifa_flags & IFF_UP) &&
ifa->ifa_addr->sa_family == AF_INET &&
(loopback == 1 && (ifa->ifa_flags & IFF_LOOPBACK))) {
*addr = *((struct sockaddr_in *)ifa->ifa_addr);
addr->sin_port = htons(PMAPPORT);
gotit = 1;
break;
}
}
if (gotit == 0 && loopback == 0) {
loopback = 1;
goto again;
}
freeifaddrs(ifap);
return (0);
}
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