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/* arping/src/unix.c
*
* Copyright (C) 2000-2011 Thomas Habets <thomas@habets.se>
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <errno.h>
#include <signal.h>
#include <string.h>
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include <pcap.h>
#include "arping.h"
#define UNUSED(x) (void)(x)
/**
* Fall back on getting device name from pcap.
*/
const char *
arping_lookupdev_default(uint32_t srcip, uint32_t dstip, char *ebuf)
{
#ifdef HAVE_PCAP_FINDALLDEVS
UNUSED(srcip);
pcap_if_t *ifs = NULL;
int rc = pcap_findalldevs(&ifs, ebuf);
if (rc) {
return NULL;
}
pcap_if_t *t;
char* ifname = NULL;
for (t = ifs; !ifname && t; t = t->next) {
#ifdef PCAP_IF_LOOPBACK
if (t->flags & PCAP_IF_LOOPBACK) {
continue;
}
#endif
#ifdef PCAP_IF_UP
if (!(t->flags & PCAP_IF_UP)) {
continue;
}
#endif
// This code is only called when using -F, which is "don't try
// to be smart". If we wanted to be smart we would have used
// findif_*.c.
if (1) {
ifname = strdup(t->name); // Memory leak.
break;
}
// UNREACHABLE
pcap_addr_t *a;
for (a = t->addresses; !ifname && a; a = a->next) {
if (a->addr->sa_family != AF_INET) {
continue;
}
const struct sockaddr_in* sa = (struct sockaddr_in*)a->addr;
const struct sockaddr_in* smask = (struct sockaddr_in*)a->netmask;
const uint32_t addr = sa->sin_addr.s_addr;
const uint32_t mask = smask->sin_addr.s_addr;
if ((addr & mask) != (dstip & mask)) {
// Not optimal: memory leak.
ifname = strdup(t->name);
}
}
}
pcap_freealldevs(ifs);
return ifname;
#else
UNUSED(srcip);
UNUSED(dstip);
return pcap_lookupdev(ebuf);
#endif
}
/**
*
*/
void
do_signal_init()
{
if (SIG_ERR == signal(SIGINT, sigint)) {
fprintf(stderr, "arping: failed to set SIGINT handler: %s\n",
strerror(errno));
}
}
/* ---- Emacs Variables ----
* Local Variables:
* c-basic-offset: 8
* indent-tabs-mode: nil
* End:
*/
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