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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* IS-IS Rout(e)ing protocol - isis_dynhn.c
* Dynamic hostname cache
* Copyright (C) 2001,2002 Sampo Saaristo
* Tampere University of Technology
* Institute of Communications Engineering
*/
#include <zebra.h>
#include "vty.h"
#include "linklist.h"
#include "memory.h"
#include "log.h"
#include "stream.h"
#include "command.h"
#include "if.h"
#include "frrevent.h"
#include "isisd/isis_constants.h"
#include "isisd/isis_common.h"
#include "isisd/isis_flags.h"
#include "isisd/isis_circuit.h"
#include "isisd/isisd.h"
#include "isisd/isis_dynhn.h"
#include "isisd/isis_misc.h"
#include "isisd/isis_constants.h"
DEFINE_MTYPE_STATIC(ISISD, ISIS_DYNHN, "ISIS dyn hostname");
static void dyn_cache_cleanup(struct event *);
void dyn_cache_init(struct isis *isis)
{
isis->dyn_cache = list_new();
if (!CHECK_FLAG(im->options, F_ISIS_UNIT_TEST))
event_add_timer(master, dyn_cache_cleanup, isis, 120,
&isis->t_dync_clean);
}
void dyn_cache_finish(struct isis *isis)
{
struct listnode *node, *nnode;
struct isis_dynhn *dyn;
EVENT_OFF(isis->t_dync_clean);
for (ALL_LIST_ELEMENTS(isis->dyn_cache, node, nnode, dyn)) {
list_delete_node(isis->dyn_cache, node);
XFREE(MTYPE_ISIS_DYNHN, dyn);
}
list_delete(&isis->dyn_cache);
}
static void dyn_cache_cleanup(struct event *thread)
{
struct listnode *node, *nnode;
struct isis_dynhn *dyn;
time_t now = time(NULL);
struct isis *isis = NULL;
isis = EVENT_ARG(thread);
isis->t_dync_clean = NULL;
for (ALL_LIST_ELEMENTS(isis->dyn_cache, node, nnode, dyn)) {
if ((now - dyn->refresh) < MAX_LSP_LIFETIME)
continue;
list_delete_node(isis->dyn_cache, node);
XFREE(MTYPE_ISIS_DYNHN, dyn);
}
event_add_timer(master, dyn_cache_cleanup, isis, 120,
&isis->t_dync_clean);
}
struct isis_dynhn *dynhn_find_by_id(struct isis *isis, const uint8_t *id)
{
struct listnode *node = NULL;
struct isis_dynhn *dyn = NULL;
for (ALL_LIST_ELEMENTS_RO(isis->dyn_cache, node, dyn))
if (memcmp(dyn->id, id, ISIS_SYS_ID_LEN) == 0)
return dyn;
return NULL;
}
struct isis_dynhn *dynhn_find_by_name(struct isis *isis, const char *hostname)
{
struct listnode *node = NULL;
struct isis_dynhn *dyn = NULL;
for (ALL_LIST_ELEMENTS_RO(isis->dyn_cache, node, dyn))
if (strncmp(dyn->hostname, hostname, 255) == 0)
return dyn;
return NULL;
}
void isis_dynhn_insert(struct isis *isis, const uint8_t *id,
const char *hostname, int level)
{
struct isis_dynhn *dyn;
dyn = dynhn_find_by_id(isis, id);
if (!dyn) {
dyn = XCALLOC(MTYPE_ISIS_DYNHN, sizeof(struct isis_dynhn));
memcpy(dyn->id, id, ISIS_SYS_ID_LEN);
dyn->level = level;
listnode_add(isis->dyn_cache, dyn);
}
snprintf(dyn->hostname, sizeof(dyn->hostname), "%s", hostname);
dyn->refresh = time(NULL);
}
void isis_dynhn_remove(struct isis *isis, const uint8_t *id)
{
struct isis_dynhn *dyn;
dyn = dynhn_find_by_id(isis, id);
if (!dyn)
return;
listnode_delete(isis->dyn_cache, dyn);
XFREE(MTYPE_ISIS_DYNHN, dyn);
}
/*
* Level System ID Dynamic Hostname (notag)
* 2 0000.0000.0001 foo-gw
* 2 0000.0000.0002 bar-gw
* * 0000.0000.0004 this-gw
*/
void dynhn_print_all(struct vty *vty, struct isis *isis)
{
struct listnode *node;
struct isis_dynhn *dyn;
vty_out(vty, "vrf : %s\n", isis->name);
if (!isis->sysid_set)
return;
vty_out(vty, "Level System ID Dynamic Hostname\n");
for (ALL_LIST_ELEMENTS_RO(isis->dyn_cache, node, dyn)) {
vty_out(vty, "%-7d", dyn->level);
vty_out(vty, "%pSY %-15s\n", dyn->id, dyn->hostname);
}
vty_out(vty, " * %pSY %s\n", isis->sysid, cmd_hostname_get());
return;
}
struct isis_dynhn *dynhn_snmp_next(struct isis *isis, const uint8_t *id,
int level)
{
struct listnode *node = NULL;
struct isis_dynhn *dyn = NULL;
struct isis_dynhn *found_dyn = NULL;
int res;
for (ALL_LIST_ELEMENTS_RO(isis->dyn_cache, node, dyn)) {
res = memcmp(dyn->id, id, ISIS_SYS_ID_LEN);
if (res < 0)
continue;
if (res == 0 && dyn->level <= level)
continue;
if (res == 0) {
/*
* This is the best match, we can stop
* searching
*/
found_dyn = dyn;
break;
}
if (found_dyn == NULL
|| memcmp(dyn->id, found_dyn->id, ISIS_SYS_ID_LEN) < 0) {
found_dyn = dyn;
}
}
return found_dyn;
}
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