Return to findif_linux.c CVS log

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

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

1.1     ! misho       1: /* arping/src/findif_linux.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:  * WARNING: non-reentrant
        !            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[1024];
        !            39:        char buf1[1024];
        !            40:        char buf2[1024];
        !            41:        char *p,*p2;
        !            42:        int n;
        !            43: 
        !            44:        do_libnet_init(ifname);
        !            45:        libnet_addr2name4_r(dstip,0,buf2,1024);
        !            46:        libnet_addr2name4_r(srcip,0,buf1,1024);
        !            47: 
        !            48:        /*
        !            49:         * Construct and run command
        !            50:         */
        !            51:        snprintf(buf, 1023, "/sbin/ip route get %s from %s 2>&1",
        !            52:                 buf2, buf1);
        !            53:        if (!(f = popen(buf, "r"))) {
        !            54:                goto failed;
        !            55:        }
        !            56:        if (0>(n = fread(buf, 1, sizeof(buf)-1, f))) {
        !            57:                pclose(f);
        !            58:                goto failed;
        !            59:        }
        !            60:        buf[n] = 0;
        !            61:        if (-1 == pclose(f)) {
        !            62:                perror("arping: pclose()");
        !            63:                goto failed;
        !            64:        }
        !            65: 
        !            66:        /*
        !            67:         * Parse interface name
        !            68:         */
        !            69:        p = strstr(buf, "dev ");
        !            70:        if (!p) {
        !            71:                goto failed;
        !            72:        }
        !            73: 
        !            74:        p+=4;
        !            75: 
        !            76:        p2 = strchr(p, ' ');
        !            77:        if (!p2) {
        !            78:                goto failed;
        !            79:        }
        !            80:        *p2 = 0;
        !            81:        return p;
        !            82:  failed:
        !            83:        return arping_lookupdev_default(ifname,srcip,dstip,ebuf);
        !            84: }