397 lines
9.4 KiB
C
397 lines
9.4 KiB
C
/*
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* Copyright (C) 2009 Internet Systems Consortium, Inc. ("ISC")
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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: context.c,v 1.3 2009/09/02 23:48:02 tbox Exp $ */
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#include <config.h>
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#include <isc/app.h>
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#include <isc/lib.h>
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#include <isc/magic.h>
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#include <isc/mem.h>
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#include <isc/once.h>
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#include <isc/socket.h>
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#include <isc/task.h>
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#include <isc/thread.h>
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#include <isc/timer.h>
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#include <isc/util.h>
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#include <dns/client.h>
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#include <dns/lib.h>
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#include <irs/context.h>
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#include <irs/dnsconf.h>
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#include <irs/resconf.h>
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#define IRS_CONTEXT_MAGIC ISC_MAGIC('I', 'R', 'S', 'c')
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#define IRS_CONTEXT_VALID(c) ISC_MAGIC_VALID(c, IRS_CONTEXT_MAGIC)
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#ifndef RESOLV_CONF
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/*% location of resolve.conf */
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#define RESOLV_CONF "/etc/resolv.conf"
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#endif
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#ifndef DNS_CONF
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/*% location of dns.conf */
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#define DNS_CONF "/etc/dns.conf"
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#endif
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#ifndef ISC_PLATFORM_USETHREADS
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irs_context_t *irs_g_context = NULL;
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#else
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static isc_boolean_t thread_key_initialized = ISC_FALSE;
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static isc_mutex_t thread_key_mutex;
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static isc_thread_key_t irs_context_key;
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static isc_once_t once = ISC_ONCE_INIT;
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#endif
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struct irs_context {
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/*
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* An IRS context is a thread-specific object, and does not need to
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* be locked.
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*/
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unsigned int magic;
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isc_mem_t *mctx;
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isc_appctx_t *actx;
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isc_taskmgr_t *taskmgr;
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isc_task_t *task;
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isc_socketmgr_t *socketmgr;
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isc_timermgr_t *timermgr;
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dns_client_t *dnsclient;
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irs_resconf_t *resconf;
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irs_dnsconf_t *dnsconf;
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};
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static void
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ctxs_destroy(isc_mem_t **mctxp, isc_appctx_t **actxp,
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isc_taskmgr_t **taskmgrp, isc_socketmgr_t **socketmgrp,
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isc_timermgr_t **timermgrp)
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{
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if (taskmgrp != NULL)
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isc_taskmgr_destroy(taskmgrp);
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if (timermgrp != NULL)
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isc_timermgr_destroy(timermgrp);
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if (socketmgrp != NULL)
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isc_socketmgr_destroy(socketmgrp);
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if (actxp != NULL)
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isc_appctx_destroy(actxp);
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if (mctxp != NULL)
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isc_mem_destroy(mctxp);
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}
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static isc_result_t
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ctxs_init(isc_mem_t **mctxp, isc_appctx_t **actxp,
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isc_taskmgr_t **taskmgrp, isc_socketmgr_t **socketmgrp,
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isc_timermgr_t **timermgrp)
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{
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isc_result_t result;
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result = isc_mem_create(0, 0, mctxp);
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if (result != ISC_R_SUCCESS)
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goto fail;
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result = isc_appctx_create(*mctxp, actxp);
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if (result != ISC_R_SUCCESS)
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goto fail;
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result = isc_taskmgr_createinctx(*mctxp, *actxp, 1, 0, taskmgrp);
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if (result != ISC_R_SUCCESS)
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goto fail;
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result = isc_socketmgr_createinctx(*mctxp, *actxp, socketmgrp);
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if (result != ISC_R_SUCCESS)
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goto fail;
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result = isc_timermgr_createinctx(*mctxp, *actxp, timermgrp);
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if (result != ISC_R_SUCCESS)
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goto fail;
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return (ISC_R_SUCCESS);
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fail:
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ctxs_destroy(mctxp, actxp, taskmgrp, socketmgrp, timermgrp);
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return (result);
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}
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#ifdef ISC_PLATFORM_USETHREADS
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static void
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free_specific_context(void *arg) {
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irs_context_t *context = arg;
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irs_context_destroy(&context);
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isc_thread_key_setspecific(irs_context_key, NULL);
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}
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static void
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thread_key_mutex_init(void) {
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RUNTIME_CHECK(isc_mutex_init(&thread_key_mutex) == ISC_R_SUCCESS);
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}
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static isc_result_t
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thread_key_init() {
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isc_result_t result;
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result = isc_once_do(&once, thread_key_mutex_init);
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if (result != ISC_R_SUCCESS)
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return (result);
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if (!thread_key_initialized) {
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LOCK(&thread_key_mutex);
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if (!thread_key_initialized &&
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isc_thread_key_create(&irs_context_key,
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free_specific_context) != 0) {
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result = ISC_R_FAILURE;
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} else
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thread_key_initialized = ISC_TRUE;
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UNLOCK(&thread_key_mutex);
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}
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return (result);
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}
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#endif /* ISC_PLATFORM_USETHREADS */
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isc_result_t
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irs_context_get(irs_context_t **contextp) {
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irs_context_t *context;
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isc_result_t result;
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REQUIRE(contextp != NULL && *contextp == NULL);
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#ifndef ISC_PLATFORM_USETHREADS
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if (irs_g_context == NULL) {
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result = irs_context_create(&irs_g_context);
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if (result != ISC_R_SUCCESS)
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return (result);
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}
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context = irs_g_context;
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#else
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result = thread_key_init();
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if (result != ISC_R_SUCCESS)
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return (result);
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context = isc_thread_key_getspecific(irs_context_key);
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if (context == NULL) {
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result = irs_context_create(&context);
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if (result != ISC_R_SUCCESS)
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return (result);
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result = isc_thread_key_setspecific(irs_context_key, context);
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if (result != ISC_R_SUCCESS) {
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irs_context_destroy(&context);
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return (result);
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}
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}
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#endif /* ISC_PLATFORM_USETHREADS */
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*contextp = context;
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return (ISC_R_SUCCESS);
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}
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isc_result_t
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irs_context_create(irs_context_t **contextp) {
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isc_result_t result;
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irs_context_t *context;
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isc_appctx_t *actx = NULL;
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isc_mem_t *mctx = NULL;
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isc_taskmgr_t *taskmgr = NULL;
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isc_socketmgr_t *socketmgr = NULL;
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isc_timermgr_t *timermgr = NULL;
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dns_client_t *client = NULL;
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isc_sockaddrlist_t *nameservers;
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irs_dnsconf_dnskeylist_t *trustedkeys;
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irs_dnsconf_dnskey_t *trustedkey;
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isc_lib_register();
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result = dns_lib_init();
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if (result != ISC_R_SUCCESS)
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return (result);
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result = ctxs_init(&mctx, &actx, &taskmgr, &socketmgr, &timermgr);
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if (result != ISC_R_SUCCESS)
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return (result);
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result = isc_app_ctxstart(actx);
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if (result != ISC_R_SUCCESS) {
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ctxs_destroy(&mctx, &actx, &taskmgr, &socketmgr, &timermgr);
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return (result);
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}
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context = isc_mem_get(mctx, sizeof(*context));
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if (context == NULL) {
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ctxs_destroy(&mctx, &actx, &taskmgr, &socketmgr, &timermgr);
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return (ISC_R_NOMEMORY);
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}
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context->mctx = mctx;
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context->actx = actx;
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context->taskmgr = taskmgr;
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context->socketmgr = socketmgr;
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context->timermgr = timermgr;
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context->resconf = NULL;
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context->dnsconf = NULL;
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context->task = NULL;
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result = isc_task_create(taskmgr, 0, &context->task);
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if (result != ISC_R_SUCCESS)
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goto fail;
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/* Create a DNS client object */
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result = dns_client_createx(mctx, actx, taskmgr, socketmgr, timermgr,
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0, &client);
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if (result != ISC_R_SUCCESS)
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goto fail;
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context->dnsclient = client;
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/* Read resolver configuration file */
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result = irs_resconf_load(mctx, RESOLV_CONF, &context->resconf);
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if (result != ISC_R_SUCCESS)
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goto fail;
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/* Set nameservers */
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nameservers = irs_resconf_getnameservers(context->resconf);
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result = dns_client_setservers(client, dns_rdataclass_in, NULL,
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nameservers);
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if (result != ISC_R_SUCCESS)
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goto fail;
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/* Read advanced DNS configuration (if any) */
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result = irs_dnsconf_load(mctx, DNS_CONF, &context->dnsconf);
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if (result != ISC_R_SUCCESS)
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goto fail;
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trustedkeys = irs_dnsconf_gettrustedkeys(context->dnsconf);
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for (trustedkey = ISC_LIST_HEAD(*trustedkeys);
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trustedkey != NULL;
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trustedkey = ISC_LIST_NEXT(trustedkey, link)) {
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result = dns_client_addtrustedkey(client, dns_rdataclass_in,
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trustedkey->keyname,
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trustedkey->keydatabuf);
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if (result != ISC_R_SUCCESS)
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goto fail;
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}
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context->magic = IRS_CONTEXT_MAGIC;
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*contextp = context;
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return (ISC_R_SUCCESS);
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fail:
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if (context->task != NULL)
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isc_task_detach(&context->task);
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if (context->resconf != NULL)
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irs_resconf_destroy(&context->resconf);
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if (context->dnsconf != NULL)
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irs_dnsconf_destroy(&context->dnsconf);
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if (client != NULL)
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dns_client_destroy(&client);
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ctxs_destroy(NULL, &actx, &taskmgr, &socketmgr, &timermgr);
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isc_mem_putanddetach(&mctx, context, sizeof(*context));
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return (result);
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}
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void
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irs_context_destroy(irs_context_t **contextp) {
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irs_context_t *context;
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REQUIRE(contextp != NULL);
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context = *contextp;
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REQUIRE(IRS_CONTEXT_VALID(context));
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isc_task_detach(&context->task);
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irs_dnsconf_destroy(&context->dnsconf);
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irs_resconf_destroy(&context->resconf);
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dns_client_destroy(&context->dnsclient);
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ctxs_destroy(NULL, &context->actx, &context->taskmgr,
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&context->socketmgr, &context->timermgr);
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context->magic = 0;
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isc_mem_putanddetach(&context->mctx, context, sizeof(*context));
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*contextp = NULL;
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#ifndef ISC_PLATFORM_USETHREADS
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irs_g_context = NULL;
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#else
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(void)isc_thread_key_setspecific(irs_context_key, NULL);
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#endif
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}
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isc_mem_t *
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irs_context_getmctx(irs_context_t *context) {
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REQUIRE(IRS_CONTEXT_VALID(context));
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return (context->mctx);
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}
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isc_appctx_t *
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irs_context_getappctx(irs_context_t *context) {
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REQUIRE(IRS_CONTEXT_VALID(context));
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return (context->actx);
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}
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isc_taskmgr_t *
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irs_context_gettaskmgr(irs_context_t *context) {
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REQUIRE(IRS_CONTEXT_VALID(context));
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return (context->taskmgr);
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}
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isc_timermgr_t *
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irs_context_gettimermgr(irs_context_t *context) {
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REQUIRE(IRS_CONTEXT_VALID(context));
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return (context->timermgr);
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}
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isc_task_t *
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irs_context_gettask(irs_context_t *context) {
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REQUIRE(IRS_CONTEXT_VALID(context));
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return (context->task);
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}
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dns_client_t *
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irs_context_getdnsclient(irs_context_t *context) {
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REQUIRE(IRS_CONTEXT_VALID(context));
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return (context->dnsclient);
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}
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irs_resconf_t *
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irs_context_getresconf(irs_context_t *context) {
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REQUIRE(IRS_CONTEXT_VALID(context));
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return (context->resconf);
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}
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irs_dnsconf_t *
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irs_context_getdnsconf(irs_context_t *context) {
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REQUIRE(IRS_CONTEXT_VALID(context));
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return (context->dnsconf);
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}
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