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; see the file COPYING; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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/isis_constants.h"
  35 #include "isisd/isis_common.h"
  36 #include "isisd/isis_flags.h"
  37 #include "isisd/isis_circuit.h"
  38 #include "isisd/isisd.h"
  39 #include "isisd/isis_dynhn.h"
  40 #include "isisd/isis_misc.h"
  41 #include "isisd/isis_constants.h"
  42
  43 DEFINE_MTYPE_STATIC(ISISD, ISIS_DYNHN, "ISIS dyn hostname");
  44
  45 extern struct host host;
  46
  47 struct list *dyn_cache = NULL;
  48 static int dyn_cache_cleanup(struct thread *);
  49
  50 void dyn_cache_init(struct isis *isis)
  51 {
  52         if (dyn_cache == NULL)
  53                 dyn_cache = list_new();
  54         if (!CHECK_FLAG(im->options, F_ISIS_UNIT_TEST))
  55                 thread_add_timer(master, dyn_cache_cleanup, isis, 120,
  56                                  &isis->t_dync_clean);
  57         return;
  58 }
  59
  60 void dyn_cache_cleanup_all(void)
  61 {
  62         struct listnode *node, *nnode;
  63         struct isis_dynhn *dyn;
  64
  65         for (ALL_LIST_ELEMENTS(dyn_cache, node, nnode, dyn)) {
  66                 list_delete_node(dyn_cache, node);
  67                 XFREE(MTYPE_ISIS_DYNHN, dyn);
  68         }
  69 }
  70
  71 static int dyn_cache_cleanup(struct thread *thread)
  72 {
  73         struct listnode *node, *nnode;
  74         struct isis_dynhn *dyn;
  75         time_t now = time(NULL);
  76         struct isis *isis = NULL;
  77
  78         isis = THREAD_ARG(thread);
  79
  80         isis->t_dync_clean = NULL;
  81
  82         for (ALL_LIST_ELEMENTS(dyn_cache, node, nnode, dyn)) {
  83                 if ((now - dyn->refresh) < MAX_LSP_LIFETIME)
  84                         continue;
  85                 list_delete_node(dyn_cache, node);
  86                 XFREE(MTYPE_ISIS_DYNHN, dyn);
  87         }
  88
  89         thread_add_timer(master, dyn_cache_cleanup, isis, 120,
  90                         &isis->t_dync_clean);
  91
  92         return ISIS_OK;
  93 }
  94
  95 struct isis_dynhn *dynhn_find_by_id(const uint8_t *id)
  96 {
  97         struct listnode *node = NULL;
  98         struct isis_dynhn *dyn = NULL;
  99
 100         for (ALL_LIST_ELEMENTS_RO(dyn_cache, node, dyn))
 101                 if (memcmp(dyn->id, id, ISIS_SYS_ID_LEN) == 0)
 102                         return dyn;
 103
 104         return NULL;
 105 }
 106
 107 struct isis_dynhn *dynhn_find_by_name(const char *hostname)
 108 {
 109         struct listnode *node = NULL;
 110         struct isis_dynhn *dyn = NULL;
 111
 112         for (ALL_LIST_ELEMENTS_RO(dyn_cache, node, dyn))
 113                 if (strncmp(dyn->hostname, hostname, 255) == 0)
 114                         return dyn;
 115
 116         return NULL;
 117 }
 118
 119 void isis_dynhn_insert(const uint8_t *id, const char *hostname, int level)
 120 {
 121         struct isis_dynhn *dyn;
 122
 123         dyn = dynhn_find_by_id(id);
 124         if (!dyn) {
 125                 dyn = XCALLOC(MTYPE_ISIS_DYNHN, sizeof(struct isis_dynhn));
 126                 memcpy(dyn->id, id, ISIS_SYS_ID_LEN);
 127                 dyn->level = level;
 128                 listnode_add(dyn_cache, dyn);
 129         }
 130
 131         snprintf(dyn->hostname, sizeof(dyn->hostname), "%s", hostname);
 132         dyn->refresh = time(NULL);
 133 }
 134
 135 void isis_dynhn_remove(const uint8_t *id)
 136 {
 137         struct isis_dynhn *dyn;
 138
 139         dyn = dynhn_find_by_id(id);
 140         if (!dyn)
 141                 return;
 142         listnode_delete(dyn_cache, dyn);
 143         XFREE(MTYPE_ISIS_DYNHN, dyn);
 144 }
 145
 146 /*
 147  * Level  System ID      Dynamic Hostname  (notag)
 148  *  2     0000.0000.0001 foo-gw
 149  *  2     0000.0000.0002 bar-gw
 150  *      * 0000.0000.0004 this-gw
 151  */
 152 void dynhn_print_all(struct vty *vty, struct isis *isis)
 153 {
 154         struct listnode *node;
 155         struct isis_dynhn *dyn;
 156
 157         vty_out(vty, "vrf     : %s\n", isis->name);
 158         if (!isis->sysid_set)
 159                 return;
 160         vty_out(vty, "Level  System ID      Dynamic Hostname\n");
 161         for (ALL_LIST_ELEMENTS_RO(dyn_cache, node, dyn)) {
 162                 vty_out(vty, "%-7d", dyn->level);
 163                 vty_out(vty, "%-15s%-15s\n", sysid_print(dyn->id),
 164                         dyn->hostname);
 165         }
 166
 167         vty_out(vty, "     * %s %s\n", sysid_print(isis->sysid),
 168                 cmd_hostname_get());
 169         return;
 170 }
 171
 172 struct isis_dynhn *dynhn_snmp_next(const uint8_t *id, int level)
 173 {
 174         struct listnode *node = NULL;
 175         struct isis_dynhn *dyn = NULL;
 176         struct isis_dynhn *found_dyn = NULL;
 177         int res;
 178
 179         for (ALL_LIST_ELEMENTS_RO(dyn_cache, node, dyn)) {
 180                 res = memcmp(dyn->id, id, ISIS_SYS_ID_LEN);
 181
 182                 if (res < 0)
 183                         continue;
 184
 185                 if (res == 0 && dyn->level <= level)
 186                         continue;
 187
 188                 if (res == 0) {
 189                         /*
 190                          * This is the best match, we can stop
 191                          * searching
 192                          */
 193
 194                         found_dyn = dyn;
 195                         break;
 196                 }
 197
 198                 if (found_dyn == NULL
 199                     || memcmp(dyn->id, found_dyn->id, ISIS_SYS_ID_LEN) < 0) {
 200                         found_dyn = dyn;
 201                 }
 202         }
 203
 204         return found_dyn;
 205 }