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