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Annotation of embedaddon/arping/src/findif_bsdroute.c, revision 1.1

1.1     ! misho       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:  */