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Annotation of embedaddon/arping/src/findif_bsd.c, revision 1.1.1.1

1.1       misho       1: /* arping/src/findif_bsd.c
                      2:  *
                      3:  *  Copyright (C) 2000-2009 Thomas Habets <thomas@habets.pp.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: #if HAVE_CONFIG_H
                     20: #include "config.h"
                     21: #endif
                     22: 
                     23: #include <stdio.h>
                     24: #include <string.h>
                     25: 
                     26: #include "arping.h"
                     27: 
                     28: /**
                     29:  *
                     30:  */
                     31: const char *
                     32: arping_lookupdev(const char *ifname,
                     33:                  uint32_t srcip,
                     34:                  uint32_t dstip,
                     35:                  char *ebuf)
                     36: {
                     37:        FILE *f;
                     38:        static char buf[10240];
                     39:        char buf1[1024];
                     40:        char *p,*p2;
                     41:        int n;
                     42: 
                     43:        do_libnet_init(ifname);
                     44:        libnet_addr2name4_r(dstip,0,buf1, 1024);
                     45: 
                     46:        /*
                     47:         * Construct and run command
                     48:         */
                     49:        snprintf(buf, 1023, "/sbin/route -n get %s 2>&1",
                     50:                 buf1);
                     51:        if (!(f = popen(buf, "r"))) {
                     52:                goto failed;
                     53:        }
                     54:        if (0 > (n = fread(buf, 1, sizeof(buf)-1, f))) {
                     55:                pclose(f);
                     56:                goto failed;
                     57:        }
                     58:        buf[n] = 0;
                     59:        if (-1 == pclose(f)) {
                     60:                perror("arping: pclose()");
                     61:                goto failed;
                     62:        }
                     63: 
                     64:        /*
                     65:         * Parse interface name
                     66:         */
                     67:        p = strstr(buf, "interface: ");
                     68:        if (!p) {
                     69:                goto failed;
                     70:        }
                     71: 
                     72:        p+=11;
                     73: 
                     74:        p2 = strchr(p, '\n');
                     75:        if (!p2) {
                     76:                goto failed;
                     77:        }
                     78:        *p2 = 0;
                     79:        return p;
                     80:  failed:
                     81:        return arping_lookupdev_default(ifname,srcip,dstip,ebuf);
                     82: }