Annotation of embedaddon/arping/src/findif_bsd.c, revision 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: }
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