00b67f09dd
Also known as ISC bind. This import adds utilities such as host(1), dig(1), and nslookup(1), as well as many other tools and libraries. Change-Id: I035ca46e64f1965d57019e773f4ff0ef035e4aa3
167 lines
3.6 KiB
C
167 lines
3.6 KiB
C
/* $NetBSD: lib.c,v 1.7 2014/12/10 04:37:58 christos Exp $ */
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/*
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* Copyright (C) 2004, 2005, 2007, 2009, 2013, 2014 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 1999-2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Id: lib.c,v 1.19 2009/09/03 00:12:23 each Exp */
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/*! \file */
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#include <config.h>
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#include <stddef.h>
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#include <isc/hash.h>
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#include <isc/mem.h>
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#include <isc/msgcat.h>
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#include <isc/mutex.h>
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#include <isc/once.h>
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#include <isc/util.h>
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#include <dns/db.h>
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#include <dns/ecdb.h>
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#include <dns/lib.h>
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#include <dns/result.h>
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#include <dst/dst.h>
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/***
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*** Globals
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***/
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LIBDNS_EXTERNAL_DATA unsigned int dns_pps = 0U;
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LIBDNS_EXTERNAL_DATA isc_msgcat_t * dns_msgcat = NULL;
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/***
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*** Private
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***/
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static isc_once_t msgcat_once = ISC_ONCE_INIT;
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/***
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*** Functions
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***/
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static void
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open_msgcat(void) {
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isc_msgcat_open("libdns.cat", &dns_msgcat);
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}
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void
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dns_lib_initmsgcat(void) {
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/*
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* Initialize the DNS library's message catalog, dns_msgcat, if it
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* has not already been initialized.
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*/
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RUNTIME_CHECK(isc_once_do(&msgcat_once, open_msgcat) == ISC_R_SUCCESS);
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}
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static isc_once_t init_once = ISC_ONCE_INIT;
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static isc_mem_t *dns_g_mctx = NULL;
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static dns_dbimplementation_t *dbimp = NULL;
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static isc_boolean_t initialize_done = ISC_FALSE;
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static isc_mutex_t reflock;
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static unsigned int references = 0;
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static void
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initialize(void) {
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isc_result_t result;
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REQUIRE(initialize_done == ISC_FALSE);
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result = isc_mem_create(0, 0, &dns_g_mctx);
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if (result != ISC_R_SUCCESS)
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return;
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dns_result_register();
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result = dns_ecdb_register(dns_g_mctx, &dbimp);
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if (result != ISC_R_SUCCESS)
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goto cleanup_mctx;
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result = isc_hash_create(dns_g_mctx, NULL, DNS_NAME_MAXWIRE);
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if (result != ISC_R_SUCCESS)
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goto cleanup_db;
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result = dst_lib_init(dns_g_mctx, NULL, 0);
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if (result != ISC_R_SUCCESS)
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goto cleanup_hash;
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result = isc_mutex_init(&reflock);
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if (result != ISC_R_SUCCESS)
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goto cleanup_dst;
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initialize_done = ISC_TRUE;
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return;
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cleanup_dst:
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dst_lib_destroy();
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cleanup_hash:
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isc_hash_destroy();
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cleanup_db:
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if (dbimp != NULL)
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dns_ecdb_unregister(&dbimp);
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cleanup_mctx:
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if (dns_g_mctx != NULL)
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isc_mem_detach(&dns_g_mctx);
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}
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isc_result_t
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dns_lib_init(void) {
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isc_result_t result;
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/*
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* Since this routine is expected to be used by a normal application,
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* it should be better to return an error, instead of an emergency
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* abort, on any failure.
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*/
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result = isc_once_do(&init_once, initialize);
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if (result != ISC_R_SUCCESS)
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return (result);
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if (!initialize_done)
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return (ISC_R_FAILURE);
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LOCK(&reflock);
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references++;
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UNLOCK(&reflock);
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return (ISC_R_SUCCESS);
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}
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void
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dns_lib_shutdown(void) {
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isc_boolean_t cleanup_ok = ISC_FALSE;
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LOCK(&reflock);
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if (--references == 0)
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cleanup_ok = ISC_TRUE;
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UNLOCK(&reflock);
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if (!cleanup_ok)
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return;
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dst_lib_destroy();
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isc_hash_destroy();
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if (dbimp != NULL)
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dns_ecdb_unregister(&dbimp);
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if (dns_g_mctx != NULL)
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isc_mem_detach(&dns_g_mctx);
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}
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