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Annotation of embedaddon/arping/src/findif_linux.c, revision 1.1.1.2

1.1       misho       1: /* arping/src/findif_linux.c
                      2:  *
1.1.1.2 ! misho       3:  *  Copyright (C) 2000-2009 Thomas Habets <thomas@habets.se>
1.1       misho       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:  */
1.1.1.2 ! misho      19: /**
        !            20:  * Fallback to ugly solution. This should not actually be used, as
        !            21:  * modern systems have getifaddrs().
        !            22:  */
1.1       misho      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:  * WARNING: non-reentrant
                     34:  */
                     35: const char *
1.1.1.2 ! misho      36: arping_lookupdev(uint32_t srcip,
1.1       misho      37:                  uint32_t dstip,
                     38:                  char *ebuf)
                     39: {
                     40:        FILE *f;
                     41:        static char buf[1024];
                     42:        char buf1[1024];
                     43:        char buf2[1024];
                     44:        char *p,*p2;
                     45:        int n;
                     46: 
1.1.1.2 ! misho      47:        do_libnet_init(NULL);
1.1       misho      48:        libnet_addr2name4_r(dstip,0,buf2,1024);
                     49:        libnet_addr2name4_r(srcip,0,buf1,1024);
                     50: 
                     51:        /*
                     52:         * Construct and run command
                     53:         */
                     54:        snprintf(buf, 1023, "/sbin/ip route get %s from %s 2>&1",
                     55:                 buf2, buf1);
                     56:        if (!(f = popen(buf, "r"))) {
                     57:                goto failed;
                     58:        }
                     59:        if (0>(n = fread(buf, 1, sizeof(buf)-1, f))) {
                     60:                pclose(f);
                     61:                goto failed;
                     62:        }
                     63:        buf[n] = 0;
                     64:        if (-1 == pclose(f)) {
                     65:                perror("arping: pclose()");
                     66:                goto failed;
                     67:        }
                     68: 
                     69:        /*
                     70:         * Parse interface name
                     71:         */
                     72:        p = strstr(buf, "dev ");
                     73:        if (!p) {
                     74:                goto failed;
                     75:        }
                     76: 
                     77:        p+=4;
                     78: 
                     79:        p2 = strchr(p, ' ');
                     80:        if (!p2) {
                     81:                goto failed;
                     82:        }
                     83:        *p2 = 0;
                     84:        return p;
                     85:  failed:
1.1.1.2 ! misho      86:        return NULL;
1.1       misho      87: }
1.1.1.2 ! misho      88: /* ---- Emacs Variables ----
        !            89:  * Local Variables:
        !            90:  * c-basic-offset: 8
        !            91:  * indent-tabs-mode: nil
        !            92:  * End:
        !            93:  */