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: */
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