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/* Libreswan interfaces management (interfaces.c)
* Copyright (C) 2001-2002 Mathieu Lafon - Arkoon Network Security
* Copyright (C) 2012 Paul Wouters <paul@libreswan.org>
* Copyright (C) 2013 D. Hugh Redelmeier <hugh@mimosa.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <sys/ioctl.h>
#include <net/if.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "lsw_socket.h"
#include "constants.h"
#include "ip_endpoint.h"
#include "ip_address.h"
#include "passert.h"
#include "ipsecconf/interfaces.h"
#include "lswlog.h" /* for pexpect() */
#include "ip_info.h"
#include "ip_protocol.h"
#include "ip_sockaddr.h"
bool starter_iface_find(const char *iface, const struct ip_info *family,
ip_address *dst, ip_address *nh)
{
/* XXX: danger REQ is recycled by ioctl() calls */
struct ifreq req;
if (iface == NULL)
return false; /* ??? can this ever happen? */
int sock = cloexec_socket(family->af, SOCK_DGRAM, 0);
if (sock < 0)
return false;
fill_and_terminate(req.ifr_name, iface, IFNAMSIZ);
/* UP? */
if (ioctl(sock, SIOCGIFFLAGS, &req) != 0 ||
(req.ifr_flags & IFF_UP) == 0x0) {
close(sock);
return false;
}
/*
* convert the sockaddr to an endpoint (ADDRESS:PORT, but
* expect PORT==0)) and then extract just the address
*/
/* get NH */
if (nh != NULL &&
(req.ifr_flags & IFF_POINTOPOINT) != 0x0 &&
(ioctl(sock, SIOCGIFDSTADDR, &req) == 0)) {
if (req.ifr_addr.sa_family == family->af) {
ip_address nh_address;
ip_port nh_port;
happy(sockaddr_to_address_port(&req.ifr_addr, family->sockaddr_size,
&nh_address, &nh_port));
pexpect(hport(nh_port) == 0);
*nh = nh_address;
}
}
/* get DST */
if (dst != NULL &&
ioctl(sock, SIOCGIFADDR, &req) == 0) {
if (req.ifr_addr.sa_family == family->af) {
ip_address dst_address;
ip_port dst_port;
happy(sockaddr_to_address_port(&req.ifr_addr, family->sockaddr_size,
&dst_address, &dst_port));
pexpect(hport(dst_port) == 0);
*dst = dst_address;
}
}
close(sock);
return true;
}
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