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-rw-r--r--lib/irs/context.c334
1 files changed, 334 insertions, 0 deletions
diff --git a/lib/irs/context.c b/lib/irs/context.c
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+++ b/lib/irs/context.c
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+/*
+ * 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.
+ */
+
+#include <stdbool.h>
+
+#include <isc/app.h>
+#include <isc/lib.h>
+#include <isc/magic.h>
+#include <isc/managers.h>
+#include <isc/mem.h>
+#include <isc/netmgr.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 RESOLV_CONF */
+
+#ifndef DNS_CONF
+/*% location of dns.conf */
+#define DNS_CONF "/etc/dns.conf"
+#endif /* ifndef DNS_CONF */
+
+ISC_THREAD_LOCAL irs_context_t *irs_context = NULL;
+
+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_nm_t *netmgr;
+ 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_nm_t **netmgrp,
+ isc_taskmgr_t **taskmgrp, isc_socketmgr_t **socketmgrp,
+ isc_timermgr_t **timermgrp) {
+ isc_managers_destroy(netmgrp == NULL ? NULL : netmgrp,
+ taskmgrp == NULL ? NULL : 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_nm_t **netmgrp,
+ isc_taskmgr_t **taskmgrp, isc_socketmgr_t **socketmgrp,
+ isc_timermgr_t **timermgrp) {
+ isc_result_t result;
+
+ isc_mem_create(mctxp);
+
+ result = isc_appctx_create(*mctxp, actxp);
+ if (result != ISC_R_SUCCESS) {
+ goto fail;
+ }
+
+ result = isc_managers_create(*mctxp, 1, 0, netmgrp, taskmgrp);
+ if (result != ISC_R_SUCCESS) {
+ goto fail;
+ }
+
+ result = isc_socketmgr_create(*mctxp, socketmgrp);
+ if (result != ISC_R_SUCCESS) {
+ goto fail;
+ }
+
+ result = isc_timermgr_create(*mctxp, timermgrp);
+ if (result != ISC_R_SUCCESS) {
+ goto fail;
+ }
+
+ return (ISC_R_SUCCESS);
+
+fail:
+ ctxs_destroy(mctxp, actxp, netmgrp, taskmgrp, socketmgrp, timermgrp);
+
+ return (result);
+}
+
+isc_result_t
+irs_context_get(irs_context_t **contextp) {
+ isc_result_t result;
+
+ REQUIRE(contextp != NULL && *contextp == NULL);
+
+ if (irs_context == NULL) {
+ result = irs_context_create(&irs_context);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ }
+
+ *contextp = irs_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_nm_t *netmgr = 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, &netmgr, &taskmgr, &socketmgr,
+ &timermgr);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ result = isc_app_ctxstart(actx);
+ if (result != ISC_R_SUCCESS) {
+ ctxs_destroy(&mctx, &actx, &netmgr, &taskmgr, &socketmgr,
+ &timermgr);
+ return (result);
+ }
+
+ context = isc_mem_get(mctx, sizeof(*context));
+
+ 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_create(mctx, actx, taskmgr, socketmgr, timermgr, 0,
+ &client, NULL, NULL);
+ 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, dns_rdatatype_dnskey,
+ 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, &netmgr, &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));
+ *contextp = irs_context = NULL;
+
+ 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->netmgr, &context->taskmgr,
+ &context->socketmgr, &context->timermgr);
+
+ context->magic = 0;
+
+ isc_mem_putanddetach(&context->mctx, context, sizeof(*context));
+}
+
+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);
+}