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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <stdbool.h>
#include <stddef.h>
#include <isc/hash.h>
#include <isc/mem.h>
#include <isc/mutex.h>
#include <isc/once.h>
#include <isc/refcount.h>
#include <isc/util.h>
#include <dns/db.h>
#include <dns/ecdb.h>
#include <dns/lib.h>
#include <dns/result.h>
#include <dst/dst.h>
/***
*** Globals
***/
LIBDNS_EXTERNAL_DATA unsigned int dns_pps = 0U;
/***
*** Functions
***/
static isc_once_t init_once = ISC_ONCE_INIT;
static isc_mem_t *dns_g_mctx = NULL;
static dns_dbimplementation_t *dbimp = NULL;
static bool initialize_done = false;
static isc_refcount_t references;
static void
initialize(void) {
isc_result_t result;
REQUIRE(!initialize_done);
isc_refcount_init(&references, 0);
isc_mem_create(&dns_g_mctx);
dns_result_register();
result = dns_ecdb_register(dns_g_mctx, &dbimp);
if (result != ISC_R_SUCCESS) {
goto cleanup_mctx;
}
result = dst_lib_init(dns_g_mctx, NULL);
if (result != ISC_R_SUCCESS) {
goto cleanup_db;
}
initialize_done = true;
return;
cleanup_db:
if (dbimp != NULL) {
dns_ecdb_unregister(&dbimp);
}
cleanup_mctx:
if (dns_g_mctx != NULL) {
isc_mem_detach(&dns_g_mctx);
}
}
isc_result_t
dns_lib_init(void) {
isc_result_t result;
/*
* Since this routine is expected to be used by a normal application,
* it should be better to return an error, instead of an emergency
* abort, on any failure.
*/
result = isc_once_do(&init_once, initialize);
if (result != ISC_R_SUCCESS) {
return (result);
}
if (!initialize_done) {
return (ISC_R_FAILURE);
}
isc_refcount_increment0(&references);
return (ISC_R_SUCCESS);
}
void
dns_lib_shutdown(void) {
if (isc_refcount_decrement(&references) == 1) {
dst_lib_destroy();
isc_refcount_destroy(&references);
if (dbimp != NULL) {
dns_ecdb_unregister(&dbimp);
}
if (dns_g_mctx != NULL) {
isc_mem_detach(&dns_g_mctx);
}
}
}
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