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. */
29int
30route_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}
76