/* arping/src/findif_bsdroute.c
*
* Copyright (C) 2000-2009 Thomas Habets <thomas@habets.se>
*
* This library 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 library 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.
*/
/**
* Fallback to ugly solution. This should not actually be used, as
* modern systems have getifaddrs().
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include "arping.h"
/**
*
*/
const char *
arping_lookupdev(uint32_t srcip,
uint32_t dstip,
char *ebuf)
{
FILE *f;
static char buf[10240];
char buf1[1024];
char *p,*p2;
int n;
do_libnet_init(NULL);
libnet_addr2name4_r(dstip,0,buf1, 1024);
/*
* Construct and run command
*/
snprintf(buf, 1023, "/sbin/route -n get %s 2>&1",
buf1);
if (!(f = popen(buf, "r"))) {
goto failed;
}
if (0 > (n = fread(buf, 1, sizeof(buf)-1, f))) {
pclose(f);
goto failed;
}
buf[n] = 0;
if (-1 == pclose(f)) {
perror("arping: pclose()");
goto failed;
}
/*
* Parse interface name
*/
p = strstr(buf, "interface: ");
if (!p) {
goto failed;
}
p+=11;
p2 = strchr(p, '\n');
if (!p2) {
goto failed;
}
*p2 = 0;
return p;
failed:
return NULL;
}
/* ---- Emacs Variables ----
* Local Variables:
* c-basic-offset: 8
* indent-tabs-mode: nil
* End:
*/
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