Return to findif_bsdroute.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / arping / src

arping 2.13

    1: /* arping/src/findif_bsdroute.c
    2:  *
    3:  *  Copyright (C) 2000-2009 Thomas Habets <thomas@habets.se>
    4:  *
    5:  *  This library is free software; you can redistribute it and/or
    6:  *  modify it under the terms of the GNU General Public
    7:  *  License as published by the Free Software Foundation; either
    8:  *  version 2 of the License, or (at your option) any later version.
    9:  *
   10:  *  This library is distributed in the hope that it will be useful,
   11:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:  *  General Public License for more details.
   14:  *
   15:  *  You should have received a copy of the GNU General Public License along
   16:  *  with this program; if not, write to the Free Software Foundation, Inc.,
   17:  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
   18:  */
   19: /**
   20:  * Fallback to ugly solution. This should not actually be used, as
   21:  * modern systems have getifaddrs().
   22:  */
   23: #if HAVE_CONFIG_H
   24: #include "config.h"
   25: #endif
   26: 
   27: #include <stdio.h>
   28: #include <string.h>
   29: 
   30: #include "arping.h"
   31: 
   32: /**
   33:  *
   34:  */
   35: const char *
   36: arping_lookupdev(uint32_t srcip,
   37:                  uint32_t dstip,
   38:                  char *ebuf)
   39: {
   40: 	FILE *f;
   41: 	static char buf[10240];
   42: 	char buf1[1024];
   43: 	char *p,*p2;
   44: 	int n;
   45: 
   46: 	do_libnet_init(NULL);
   47: 	libnet_addr2name4_r(dstip,0,buf1, 1024);
   48: 
   49: 	/*
   50: 	 * Construct and run command
   51: 	 */
   52: 	snprintf(buf, 1023, "/sbin/route -n get %s 2>&1",
   53: 		 buf1);
   54: 	if (!(f = popen(buf, "r"))) {
   55: 		goto failed;
   56: 	}
   57: 	if (0 > (n = fread(buf, 1, sizeof(buf)-1, f))) {
   58: 		pclose(f);
   59: 		goto failed;
   60: 	}
   61: 	buf[n] = 0;
   62: 	if (-1 == pclose(f)) {
   63: 		perror("arping: pclose()");
   64: 		goto failed;
   65: 	}
   66: 
   67: 	/*
   68: 	 * Parse interface name
   69: 	 */
   70: 	p = strstr(buf, "interface: ");
   71: 	if (!p) {
   72: 		goto failed;
   73: 	}
   74: 
   75: 	p+=11;
   76: 
   77: 	p2 = strchr(p, '\n');
   78: 	if (!p2) {
   79: 		goto failed;
   80: 	}
   81: 	*p2 = 0;
   82: 	return p;
   83:  failed:
   84: 	return NULL;
   85: }
   86: /* ---- Emacs Variables ----
   87:  * Local Variables:
   88:  * c-basic-offset: 8
   89:  * indent-tabs-mode: nil
   90:  * End:
   91:  */