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/* Authors: Martin Nagy <mnagy@redhat.com>
*
* Copyright (C) 2009 Red Hat
* see file 'COPYING' for use and warranty information
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; version 2 only
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <isc/mem.h>
#include <isc/once.h>
#include <isc/result.h>
#include <isc/task.h>
#include <isc/timer.h>
#include <isc/util.h>
#include <dns/dynamic_db.h>
#include <dns/view.h>
#include <dns/zone.h>
#include <string.h>
#include "ldap_convert.h"
#include "ldap_helper.h"
#include "log.h"
#include "settings.h"
#include "util.h"
#include "zone_manager.h"
struct db_instance {
isc_mem_t *mctx;
char *name;
ldap_instance_t *ldap_inst;
ldap_cache_t *ldap_cache;
isc_timer_t *timer;
LINK(db_instance_t) link;
};
static isc_once_t initialize_once = ISC_ONCE_INIT;
static isc_mutex_t instance_list_lock;
static LIST(db_instance_t) instance_list;
static void initialize_manager(void);
static void destroy_db_instance(db_instance_t **db_instp);
static isc_result_t find_db_instance(const char *name, db_instance_t **instance);
static void
initialize_manager(void)
{
INIT_LIST(instance_list);
isc_mutex_init(&instance_list_lock);
}
void
destroy_manager(void)
{
db_instance_t *db_inst;
db_instance_t *next;
isc_once_do(&initialize_once, initialize_manager);
LOCK(&instance_list_lock);
db_inst = HEAD(instance_list);
while (db_inst != NULL) {
next = NEXT(db_inst, link);
UNLINK(instance_list, db_inst, link);
destroy_db_instance(&db_inst);
db_inst = next;
}
UNLOCK(&instance_list_lock);
}
static void
destroy_db_instance(db_instance_t **db_instp)
{
db_instance_t *db_inst;
REQUIRE(db_instp != NULL && *db_instp != NULL);
db_inst = *db_instp;
if (db_inst->timer != NULL)
isc_timer_detach(&db_inst->timer);
if (db_inst->ldap_inst != NULL)
destroy_ldap_instance(&db_inst->ldap_inst);
if (db_inst->ldap_cache != NULL)
destroy_ldap_cache(&db_inst->ldap_cache);
if (db_inst->name != NULL)
isc_mem_free(db_inst->mctx, db_inst->name);
isc_mem_putanddetach(&db_inst->mctx, db_inst, sizeof(*db_inst));
*db_instp = NULL;
}
static void refresh_zones_action(isc_task_t *task, isc_event_t *event);
isc_result_t
manager_create_db_instance(isc_mem_t *mctx, const char *name,
const char * const *argv,
dns_dyndb_arguments_t *dyndb_args)
{
isc_result_t result;
db_instance_t *db_inst = NULL;
unsigned int zone_refresh;
setting_t manager_settings[] = {
{ "zone_refresh", default_uint(0) },
end_of_settings
};
REQUIRE(mctx != NULL);
REQUIRE(name != NULL);
REQUIRE(dyndb_args != NULL);
isc_once_do(&initialize_once, initialize_manager);
result = find_db_instance(name, &db_inst);
if (result == ISC_R_SUCCESS) {
db_inst = NULL;
result = ISC_R_FAILURE;
log_error("'%s' already exists", name);
goto cleanup;
} else {
result = ISC_R_SUCCESS;
}
/* Parse settings. */
manager_settings[0].target = &zone_refresh;
CHECK(set_settings(manager_settings, argv));
CHECKED_MEM_GET_PTR(mctx, db_inst);
ZERO_PTR(db_inst);
isc_mem_attach(mctx, &db_inst->mctx);
CHECKED_MEM_STRDUP(mctx, name, db_inst->name);
CHECK(new_ldap_instance(mctx, db_inst->name, argv, dyndb_args, &db_inst->ldap_inst));
CHECK(new_ldap_cache(mctx, argv, &db_inst->ldap_cache));
result = refresh_zones_from_ldap(db_inst->ldap_inst, ISC_TRUE);
if (result != ISC_R_SUCCESS) {
/* In case we don't find any zones, we at least return
* ISC_R_SUCCESS so BIND won't exit because of this. */
result = ISC_R_SUCCESS;
log_error("no valid zones found");
goto cleanup;
}
/* Add a timer to periodically refresh the zones. */
if (zone_refresh) {
isc_task_t *task;
isc_timermgr_t *timer_mgr;
isc_interval_t interval;
task = dns_dyndb_get_task(dyndb_args);
timer_mgr = dns_dyndb_get_timermgr(dyndb_args);
isc_interval_set(&interval, zone_refresh, 0);
CHECK(isc_timer_create(timer_mgr, isc_timertype_ticker, NULL,
&interval, task, refresh_zones_action,
db_inst, &db_inst->timer));
}
LOCK(&instance_list_lock);
APPEND(instance_list, db_inst, link);
UNLOCK(&instance_list_lock);
return ISC_R_SUCCESS;
cleanup:
if (db_inst != NULL)
destroy_db_instance(&db_inst);
return result;
}
static void
refresh_zones_action(isc_task_t *task, isc_event_t *event)
{
db_instance_t *db_inst = event->ev_arg;
UNUSED(task);
LOCK(&instance_list_lock);
refresh_zones_from_ldap(db_inst->ldap_inst, ISC_FALSE);
UNLOCK(&instance_list_lock);
isc_event_free(&event);
}
isc_result_t
manager_get_ldap_instance_and_cache(const char *name, ldap_instance_t **ldap_inst,
ldap_cache_t **ldap_cache)
{
isc_result_t result;
db_instance_t *db_inst;
REQUIRE(name != NULL);
REQUIRE(ldap_inst != NULL);
REQUIRE(ldap_cache != NULL);
isc_once_do(&initialize_once, initialize_manager);
db_inst = NULL;
CHECK(find_db_instance(name, &db_inst));
*ldap_inst = db_inst->ldap_inst;
*ldap_cache = db_inst->ldap_cache;
cleanup:
return result;
}
static isc_result_t
find_db_instance(const char *name, db_instance_t **instance)
{
db_instance_t *iterator;
REQUIRE(name != NULL);
REQUIRE(instance != NULL && *instance == NULL);
LOCK(&instance_list_lock);
iterator = HEAD(instance_list);
while (iterator != NULL) {
if (strcmp(name, iterator->name) == 0)
break;
iterator = NEXT(iterator, link);
}
UNLOCK(&instance_list_lock);
if (iterator != NULL) {
*instance = iterator;
return ISC_R_SUCCESS;
}
return ISC_R_NOTFOUND;
}
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