release/src/router/zebra/zebra/rtread_sysctl.c

   1 /*
   2  * Kernel routing table read by sysctl function.
   3  * Copyright (C) 1997, 98 Kunihiro Ishiguro
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * GNU Zebra is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  19  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20  * 02111-1307, USA.
  21  */
  22
  23 #include <zebra.h>
  24
  25 #include "memory.h"
  26 #include "log.h"
  27
  28 /* Kernel routing table read up by sysctl function. */
  29 int
  30 route_read ()
  31 {
  32   caddr_t buf, end, ref;
  33   size_t bufsiz;
  34   struct rt_msghdr *rtm;
  35   void rtm_read (struct rt_msghdr *);
  36
  37 #define MIBSIZ 6
  38   int mib[MIBSIZ] =
  39   {
  40     CTL_NET,
  41     PF_ROUTE,
  42     0,
  43     0,
  44     NET_RT_DUMP,
  45     0
  46   };
  47
  48   /* Get buffer size. */
  49   if (sysctl (mib, MIBSIZ, NULL, &bufsiz, NULL, 0) < 0)
  50     {
  51       zlog_warn ("sysctl fail: %s", strerror (errno));
  52       return -1;
  53     }
  54
  55   /* Allocate buffer. */
  56   ref = buf = XMALLOC (MTYPE_TMP, bufsiz);
  57
  58   /* Read routing table information by calling sysctl(). */
  59   if (sysctl (mib, MIBSIZ, buf, &bufsiz, NULL, 0) < 0)
  60     {
  61       zlog_warn ("sysctl() fail by %s", strerror (errno));
  62       return -1;
  63     }
  64
  65   for (end = buf + bufsiz; buf < end; buf += rtm->rtm_msglen)
  66     {
  67       rtm = (struct rt_msghdr *) buf;
  68       rtm_read (rtm);
  69     }
  70
  71   /* Free buffer. */
  72   XFREE (MTYPE_TMP, ref);
  73
  74   return 0;
  75 }