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Diffstat (limited to '')
| -rw-r--r-- | lib/irs/context.c | 392 |
1 files changed, 392 insertions, 0 deletions
diff --git a/lib/irs/context.c b/lib/irs/context.c new file mode 100644 index 0000000..b644693 --- /dev/null +++ b/lib/irs/context.c @@ -0,0 +1,392 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * 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 http://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + + +#include <config.h> + +#include <stdbool.h> + +#include <isc/app.h> +#include <isc/lib.h> +#include <isc/magic.h> +#include <isc/mem.h> +#include <isc/once.h> +#include <isc/socket.h> +#include <isc/task.h> +#include <isc/thread.h> +#include <isc/timer.h> +#include <isc/util.h> + +#include <dns/client.h> +#include <dns/lib.h> + +#include <irs/context.h> +#include <irs/dnsconf.h> +#include <irs/resconf.h> + +#define IRS_CONTEXT_MAGIC ISC_MAGIC('I', 'R', 'S', 'c') +#define IRS_CONTEXT_VALID(c) ISC_MAGIC_VALID(c, IRS_CONTEXT_MAGIC) + +#ifndef RESOLV_CONF +/*% location of resolve.conf */ +#define RESOLV_CONF "/etc/resolv.conf" +#endif + +#ifndef DNS_CONF +/*% location of dns.conf */ +#define DNS_CONF "/etc/dns.conf" +#endif + +#ifndef ISC_PLATFORM_USETHREADS +irs_context_t *irs_g_context = NULL; +#else +static bool thread_key_initialized = false; +static isc_mutex_t thread_key_mutex; +static isc_thread_key_t irs_context_key; +static isc_once_t once = ISC_ONCE_INIT; +#endif + + +struct irs_context { + /* + * An IRS context is a thread-specific object, and does not need to + * be locked. + */ + unsigned int magic; + isc_mem_t *mctx; + isc_appctx_t *actx; + isc_taskmgr_t *taskmgr; + isc_task_t *task; + isc_socketmgr_t *socketmgr; + isc_timermgr_t *timermgr; + dns_client_t *dnsclient; + irs_resconf_t *resconf; + irs_dnsconf_t *dnsconf; +}; + +static void +ctxs_destroy(isc_mem_t **mctxp, isc_appctx_t **actxp, + isc_taskmgr_t **taskmgrp, isc_socketmgr_t **socketmgrp, + isc_timermgr_t **timermgrp) +{ + if (taskmgrp != NULL) + isc_taskmgr_destroy(taskmgrp); + + if (timermgrp != NULL) + isc_timermgr_destroy(timermgrp); + + if (socketmgrp != NULL) + isc_socketmgr_destroy(socketmgrp); + + if (actxp != NULL) + isc_appctx_destroy(actxp); + + if (mctxp != NULL) + isc_mem_destroy(mctxp); +} + +static isc_result_t +ctxs_init(isc_mem_t **mctxp, isc_appctx_t **actxp, + isc_taskmgr_t **taskmgrp, isc_socketmgr_t **socketmgrp, + isc_timermgr_t **timermgrp) +{ + isc_result_t result; + + result = isc_mem_create(0, 0, mctxp); + if (result != ISC_R_SUCCESS) + goto fail; + + result = isc_appctx_create(*mctxp, actxp); + if (result != ISC_R_SUCCESS) + goto fail; + + result = isc_taskmgr_createinctx(*mctxp, *actxp, 1, 0, taskmgrp); + if (result != ISC_R_SUCCESS) + goto fail; + + result = isc_socketmgr_createinctx(*mctxp, *actxp, socketmgrp); + if (result != ISC_R_SUCCESS) + goto fail; + + result = isc_timermgr_createinctx(*mctxp, *actxp, timermgrp); + if (result != ISC_R_SUCCESS) + goto fail; + + return (ISC_R_SUCCESS); + + fail: + ctxs_destroy(mctxp, actxp, taskmgrp, socketmgrp, timermgrp); + + return (result); +} + +#ifdef ISC_PLATFORM_USETHREADS +static void +free_specific_context(void *arg) { + irs_context_t *context = arg; + + irs_context_destroy(&context); + + isc_thread_key_setspecific(irs_context_key, NULL); +} + +static void +thread_key_mutex_init(void) { + RUNTIME_CHECK(isc_mutex_init(&thread_key_mutex) == ISC_R_SUCCESS); +} + +static isc_result_t +thread_key_init(void) { + isc_result_t result; + + result = isc_once_do(&once, thread_key_mutex_init); + if (result != ISC_R_SUCCESS) + return (result); + + if (!thread_key_initialized) { + LOCK(&thread_key_mutex); + + if (!thread_key_initialized && + isc_thread_key_create(&irs_context_key, + free_specific_context) != 0) { + result = ISC_R_FAILURE; + } else + thread_key_initialized = true; + + UNLOCK(&thread_key_mutex); + } + + return (result); +} +#endif /* ISC_PLATFORM_USETHREADS */ + +isc_result_t +irs_context_get(irs_context_t **contextp) { + irs_context_t *context; + isc_result_t result; + + REQUIRE(contextp != NULL && *contextp == NULL); + +#ifndef ISC_PLATFORM_USETHREADS + if (irs_g_context == NULL) { + result = irs_context_create(&irs_g_context); + if (result != ISC_R_SUCCESS) + return (result); + } + + context = irs_g_context; +#else + result = thread_key_init(); + if (result != ISC_R_SUCCESS) + return (result); + + context = isc_thread_key_getspecific(irs_context_key); + if (context == NULL) { + result = irs_context_create(&context); + if (result != ISC_R_SUCCESS) + return (result); + result = isc_thread_key_setspecific(irs_context_key, context); + if (result != ISC_R_SUCCESS) { + irs_context_destroy(&context); + return (result); + } + } +#endif /* ISC_PLATFORM_USETHREADS */ + + *contextp = context; + + return (ISC_R_SUCCESS); +} + +isc_result_t +irs_context_create(irs_context_t **contextp) { + isc_result_t result; + irs_context_t *context; + isc_appctx_t *actx = NULL; + isc_mem_t *mctx = NULL; + isc_taskmgr_t *taskmgr = NULL; + isc_socketmgr_t *socketmgr = NULL; + isc_timermgr_t *timermgr = NULL; + dns_client_t *client = NULL; + isc_sockaddrlist_t *nameservers; + irs_dnsconf_dnskeylist_t *trustedkeys; + irs_dnsconf_dnskey_t *trustedkey; + + isc_lib_register(); + result = dns_lib_init(); + if (result != ISC_R_SUCCESS) + return (result); + + result = ctxs_init(&mctx, &actx, &taskmgr, &socketmgr, &timermgr); + if (result != ISC_R_SUCCESS) + return (result); + + result = isc_app_ctxstart(actx); + if (result != ISC_R_SUCCESS) { + ctxs_destroy(&mctx, &actx, &taskmgr, &socketmgr, &timermgr); + return (result); + } + + context = isc_mem_get(mctx, sizeof(*context)); + if (context == NULL) { + ctxs_destroy(&mctx, &actx, &taskmgr, &socketmgr, &timermgr); + return (ISC_R_NOMEMORY); + } + + context->mctx = mctx; + context->actx = actx; + context->taskmgr = taskmgr; + context->socketmgr = socketmgr; + context->timermgr = timermgr; + context->resconf = NULL; + context->dnsconf = NULL; + context->task = NULL; + result = isc_task_create(taskmgr, 0, &context->task); + if (result != ISC_R_SUCCESS) + goto fail; + + /* Create a DNS client object */ + result = dns_client_createx(mctx, actx, taskmgr, socketmgr, timermgr, + 0, &client); + if (result != ISC_R_SUCCESS) + goto fail; + context->dnsclient = client; + + /* Read resolver configuration file */ + result = irs_resconf_load(mctx, RESOLV_CONF, &context->resconf); + if (result != ISC_R_SUCCESS) + goto fail; + /* Set nameservers */ + nameservers = irs_resconf_getnameservers(context->resconf); + result = dns_client_setservers(client, dns_rdataclass_in, NULL, + nameservers); + if (result != ISC_R_SUCCESS) + goto fail; + + /* Read advanced DNS configuration (if any) */ + result = irs_dnsconf_load(mctx, DNS_CONF, &context->dnsconf); + if (result != ISC_R_SUCCESS) + goto fail; + trustedkeys = irs_dnsconf_gettrustedkeys(context->dnsconf); + for (trustedkey = ISC_LIST_HEAD(*trustedkeys); + trustedkey != NULL; + trustedkey = ISC_LIST_NEXT(trustedkey, link)) { + result = dns_client_addtrustedkey(client, dns_rdataclass_in, + trustedkey->keyname, + trustedkey->keydatabuf); + if (result != ISC_R_SUCCESS) + goto fail; + } + + context->magic = IRS_CONTEXT_MAGIC; + *contextp = context; + + return (ISC_R_SUCCESS); + + fail: + if (context->task != NULL) + isc_task_detach(&context->task); + if (context->resconf != NULL) + irs_resconf_destroy(&context->resconf); + if (context->dnsconf != NULL) + irs_dnsconf_destroy(&context->dnsconf); + if (client != NULL) + dns_client_destroy(&client); + ctxs_destroy(NULL, &actx, &taskmgr, &socketmgr, &timermgr); + isc_mem_putanddetach(&mctx, context, sizeof(*context)); + + return (result); +} + +void +irs_context_destroy(irs_context_t **contextp) { + irs_context_t *context; + + REQUIRE(contextp != NULL); + context = *contextp; + REQUIRE(IRS_CONTEXT_VALID(context)); + + isc_task_detach(&context->task); + irs_dnsconf_destroy(&context->dnsconf); + irs_resconf_destroy(&context->resconf); + dns_client_destroy(&context->dnsclient); + + ctxs_destroy(NULL, &context->actx, &context->taskmgr, + &context->socketmgr, &context->timermgr); + + context->magic = 0; + + isc_mem_putanddetach(&context->mctx, context, sizeof(*context)); + + *contextp = NULL; + +#ifndef ISC_PLATFORM_USETHREADS + irs_g_context = NULL; +#else + (void)isc_thread_key_setspecific(irs_context_key, NULL); +#endif +} + +isc_mem_t * +irs_context_getmctx(irs_context_t *context) { + REQUIRE(IRS_CONTEXT_VALID(context)); + + return (context->mctx); +} + +isc_appctx_t * +irs_context_getappctx(irs_context_t *context) { + REQUIRE(IRS_CONTEXT_VALID(context)); + + return (context->actx); +} + +isc_taskmgr_t * +irs_context_gettaskmgr(irs_context_t *context) { + REQUIRE(IRS_CONTEXT_VALID(context)); + + return (context->taskmgr); +} + +isc_timermgr_t * +irs_context_gettimermgr(irs_context_t *context) { + REQUIRE(IRS_CONTEXT_VALID(context)); + + return (context->timermgr); +} + +isc_task_t * +irs_context_gettask(irs_context_t *context) { + REQUIRE(IRS_CONTEXT_VALID(context)); + + return (context->task); +} + +dns_client_t * +irs_context_getdnsclient(irs_context_t *context) { + REQUIRE(IRS_CONTEXT_VALID(context)); + + return (context->dnsclient); +} + +irs_resconf_t * +irs_context_getresconf(irs_context_t *context) { + REQUIRE(IRS_CONTEXT_VALID(context)); + + return (context->resconf); +} + +irs_dnsconf_t * +irs_context_getdnsconf(irs_context_t *context) { + REQUIRE(IRS_CONTEXT_VALID(context)); + + return (context->dnsconf); +} |