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/*
* Copyright (C) 2004, 2005, 2007, 2009 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: lib.c,v 1.19 2009/09/03 00:12:23 each Exp $ */
/*! \file */
#include <config.h>
#include <stddef.h>
#include <isc/hash.h>
#include <isc/mem.h>
#include <isc/msgcat.h>
#include <isc/mutex.h>
#include <isc/once.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;
LIBDNS_EXTERNAL_DATA isc_msgcat_t * dns_msgcat = NULL;
/***
*** Private
***/
static isc_once_t msgcat_once = ISC_ONCE_INIT;
/***
*** Functions
***/
static void
open_msgcat(void) {
isc_msgcat_open("libdns.cat", &dns_msgcat);
}
void
dns_lib_initmsgcat(void) {
/*
* Initialize the DNS library's message catalog, dns_msgcat, if it
* has not already been initialized.
*/
RUNTIME_CHECK(isc_once_do(&msgcat_once, open_msgcat) == ISC_R_SUCCESS);
}
static isc_once_t init_once = ISC_ONCE_INIT;
static isc_mem_t *dns_g_mctx = NULL;
#ifndef BIND9
static dns_dbimplementation_t *dbimp = NULL;
#endif
static isc_boolean_t initialize_done = ISC_FALSE;
static isc_mutex_t reflock;
static unsigned int references = 0;
static void
initialize(void) {
isc_result_t result;
REQUIRE(initialize_done == ISC_FALSE);
result = isc_mem_create(0, 0, &dns_g_mctx);
if (result != ISC_R_SUCCESS)
return;
dns_result_register();
#ifndef BIND9
result = dns_ecdb_register(dns_g_mctx, &dbimp);
if (result != ISC_R_SUCCESS)
goto cleanup_mctx;
#endif
result = isc_hash_create(dns_g_mctx, NULL, DNS_NAME_MAXWIRE);
if (result != ISC_R_SUCCESS)
goto cleanup_db;
result = dst_lib_init(dns_g_mctx, NULL, 0);
if (result != ISC_R_SUCCESS)
goto cleanup_hash;
result = isc_mutex_init(&reflock);
if (result != ISC_R_SUCCESS)
goto cleanup_dst;
initialize_done = ISC_TRUE;
return;
cleanup_dst:
dst_lib_destroy();
cleanup_hash:
isc_hash_destroy();
cleanup_db:
#ifndef BIND9
dns_ecdb_unregister(&dbimp);
cleanup_mctx:
#endif
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);
LOCK(&reflock);
references++;
UNLOCK(&reflock);
return (ISC_R_SUCCESS);
}
void
dns_lib_shutdown(void) {
isc_boolean_t cleanup_ok = ISC_FALSE;
LOCK(&reflock);
if (--references == 0)
cleanup_ok = ISC_TRUE;
UNLOCK(&reflock);
if (!cleanup_ok)
return;
dst_lib_destroy();
isc_hash_destroy();
#ifndef BIND9
dns_ecdb_unregister(&dbimp);
#endif
isc_mem_detach(&dns_g_mctx);
}
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