isisd/isis_dynhn.c

   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 }