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    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: #include "zebra/zserv.h"
   29: #include "zebra/rt.h"
   30: #include "zebra/kernel_socket.h"
   31: 
   32: /* Kernel routing table read up by sysctl function. */
   33: void
   34: route_read (void)
   35: {
   36:   caddr_t buf, end, ref;
   37:   size_t bufsiz;
   38:   struct rt_msghdr *rtm;
   39:   
   40: #define MIBSIZ 6
   41:   int mib[MIBSIZ] = 
   42:   {
   43:     CTL_NET,
   44:     PF_ROUTE,
   45:     0,
   46:     0,
   47:     NET_RT_DUMP,
   48:     0
   49:   };
   50: 		      
   51:   /* Get buffer size. */
   52:   if (sysctl (mib, MIBSIZ, NULL, &bufsiz, NULL, 0) < 0) 
   53:     {
   54:       zlog_warn ("sysctl fail: %s", safe_strerror (errno));
   55:       return;
   56:     }
   57: 
   58:   /* Allocate buffer. */
   59:   ref = buf = XMALLOC (MTYPE_TMP, bufsiz);
   60:   
   61:   /* Read routing table information by calling sysctl(). */
   62:   if (sysctl (mib, MIBSIZ, buf, &bufsiz, NULL, 0) < 0) 
   63:     {
   64:       zlog_warn ("sysctl() fail by %s", safe_strerror (errno));
   65:       return;
   66:     }
   67: 
   68:   for (end = buf + bufsiz; buf < end; buf += rtm->rtm_msglen) 
   69:     {
   70:       rtm = (struct rt_msghdr *) buf;
   71:       /* We must set RTF_DONE here, so rtm_read() doesn't ignore the message. */
   72:       SET_FLAG (rtm->rtm_flags, RTF_DONE);
   73:       rtm_read (rtm);
   74:     }
   75: 
   76:   /* Free buffer. */
   77:   XFREE (MTYPE_TMP, ref);
   78: 
   79:   return;
   80: }