1 files changed, 334 insertions, 0 deletions
diff --git a/lib/irs/context.c b/lib/irs/context.c
new file mode 100644
index 0000000..e783358
--- /dev/null
+++ b/lib/irs/context.c
@@ -0,0 +1,334 @@
+/*
+ * 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);
+}