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-rw-r--r--lib/dns/lib.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/lib/dns/lib.c b/lib/dns/lib.c
new file mode 100644
index 0000000..e8eab73
--- /dev/null
+++ b/lib/dns/lib.c
@@ -0,0 +1,119 @@
+/*
+ * 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);
+ }
+ }
+}