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Annotation of embedaddon/quagga/zebra/rtread_sysctl.c, revision 1.1

1.1     ! misho       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: }