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    1: /*
    2:  * IS-IS Rout(e)ing protocol - isis_dynhn.c
    3:  *                             Dynamic hostname cache
    4:  * Copyright (C) 2001,2002   Sampo Saaristo
    5:  *                           Tampere University of Technology      
    6:  *                           Institute of Communications Engineering
    7:  *
    8:  * This program is free software; you can redistribute it and/or modify it 
    9:  * under the terms of the GNU General Public Licenseas published by the Free 
   10:  * Software Foundation; either version 2 of the License, or (at your option) 
   11:  * any later version.
   12:  *
   13:  * This program is distributed in the hope that it will be useful,but WITHOUT 
   14:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
   15:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for 
   16:  * more details.
   17:  *
   18:  * You should have received a copy of the GNU General Public License along 
   19:  * with this program; if not, write to the Free Software Foundation, Inc., 
   20:  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
   21:  */
   22: 
   23: #include <zebra.h>
   24: 
   25: #include "vty.h"
   26: #include "linklist.h"
   27: #include "memory.h"
   28: #include "log.h"
   29: #include "stream.h"
   30: #include "command.h"
   31: #include "if.h"
   32: #include "thread.h"
   33: 
   34: #include "isisd/dict.h"
   35: #include "isisd/isis_constants.h"
   36: #include "isisd/isis_common.h"
   37: #include "isisd/isis_flags.h"
   38: #include "isisd/isis_circuit.h"
   39: #include "isisd/isisd.h"
   40: #include "isisd/isis_dynhn.h"
   41: #include "isisd/isis_misc.h"
   42: #include "isisd/isis_constants.h"
   43: 
   44: extern struct isis *isis;
   45: extern struct thread_master *master;
   46: extern struct host host;
   47: 
   48: struct list *dyn_cache = NULL;
   49: static int dyn_cache_cleanup (struct thread *);
   50: 
   51: void
   52: dyn_cache_init (void)
   53: {
   54:   dyn_cache = list_new ();
   55:   THREAD_TIMER_ON (master, isis->t_dync_clean, dyn_cache_cleanup, NULL, 120);
   56:   return;
   57: }
   58: 
   59: static int
   60: dyn_cache_cleanup (struct thread *thread)
   61: {
   62:   struct listnode *node, *nnode;
   63:   struct isis_dynhn *dyn;
   64:   time_t now = time (NULL);
   65: 
   66:   isis->t_dync_clean = NULL;
   67: 
   68:   for (ALL_LIST_ELEMENTS (dyn_cache, node, nnode, dyn))
   69:     {
   70:       if ((now - dyn->refresh) < (MAX_AGE + 120))
   71: 	continue;
   72: 
   73:       list_delete_node (dyn_cache, node);
   74:       XFREE (MTYPE_ISIS_DYNHN, dyn);
   75:     }
   76: 
   77:   THREAD_TIMER_ON (master, isis->t_dync_clean, dyn_cache_cleanup, NULL, 120);
   78:   return ISIS_OK;
   79: }
   80: 
   81: struct isis_dynhn *
   82: dynhn_find_by_id (u_char * id)
   83: {
   84:   struct listnode *node = NULL;
   85:   struct isis_dynhn *dyn = NULL;
   86: 
   87:   for (ALL_LIST_ELEMENTS_RO (dyn_cache, node, dyn))
   88:     if (memcmp (dyn->id, id, ISIS_SYS_ID_LEN) == 0)
   89:       return dyn;
   90: 
   91:   return NULL;
   92: }
   93: 
   94: void
   95: isis_dynhn_insert (u_char * id, struct hostname *hostname, int level)
   96: {
   97:   struct isis_dynhn *dyn;
   98: 
   99:   dyn = dynhn_find_by_id (id);
  100:   if (dyn)
  101:     {
  102:       memcpy (&dyn->name, hostname, hostname->namelen + 1);
  103:       memcpy (dyn->id, id, ISIS_SYS_ID_LEN);
  104:       dyn->refresh = time (NULL);
  105:       return;
  106:     }
  107:   dyn = XCALLOC (MTYPE_ISIS_DYNHN, sizeof (struct isis_dynhn));
  108:   if (!dyn)
  109:     {
  110:       zlog_warn ("isis_dynhn_insert(): out of memory!");
  111:       return;
  112:     }
  113: 
  114:   /* we also copy the length */
  115:   memcpy (&dyn->name, hostname, hostname->namelen + 1);
  116:   memcpy (dyn->id, id, ISIS_SYS_ID_LEN);
  117:   dyn->refresh = time (NULL);
  118:   dyn->level = level;
  119: 
  120:   listnode_add (dyn_cache, dyn);
  121: 
  122:   return;
  123: }
  124: 
  125: /*
  126:  * Level  System ID      Dynamic Hostname  (notag)
  127:  *  2     0000.0000.0001 foo-gw
  128:  *  2     0000.0000.0002 bar-gw
  129:  *      * 0000.0000.0004 this-gw
  130:  */
  131: void
  132: dynhn_print_all (struct vty *vty)
  133: {
  134:   struct listnode *node;
  135:   struct isis_dynhn *dyn;
  136: 
  137:   vty_out (vty, "Level  System ID      Dynamic Hostname%s", VTY_NEWLINE);
  138:   for (ALL_LIST_ELEMENTS_RO (dyn_cache, node, dyn))
  139:     {
  140:       vty_out (vty, "%-7d", dyn->level);
  141:       vty_out (vty, "%-15s%-15s%s", sysid_print (dyn->id), dyn->name.name,
  142: 	       VTY_NEWLINE);
  143:     }
  144: 
  145:   vty_out (vty, "     * %s %s%s", sysid_print (isis->sysid), unix_hostname (),
  146: 	   VTY_NEWLINE);
  147:   return;
  148: }