1 files changed, 143 insertions, 0 deletions
diff --git a/src/libstrongswan/plugins/unbound/unbound_resolver.c b/src/libstrongswan/plugins/unbound/unbound_resolver.c
new file mode 100644
index 000000000..44a2c764b
--- /dev/null
+++ b/src/libstrongswan/plugins/unbound/unbound_resolver.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2011-2012 Reto Guadagnini
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include <unbound.h>
+#include <errno.h>
+#include <ldns/ldns.h>
+#include <string.h>
+
+#include <library.h>
+#include <utils/debug.h>
+
+#include "unbound_resolver.h"
+#include "unbound_response.h"
+
+/* DNS resolver configuration and DNSSEC trust anchors */
+#define RESOLV_CONF_FILE	"/etc/resolv.conf"
+#define TRUST_ANCHOR_FILE	IPSEC_CONFDIR "/ipsec.d/dnssec.keys"
+
+typedef struct private_resolver_t private_resolver_t;
+
+/**
+ * private data of a unbound_resolver_t object.
+ */
+struct private_resolver_t {
+
+	/**
+	 * Public data
+	 */
+	resolver_t public;
+
+	/**
+	 * private unbound resolver handle (unbound context)
+	 */
+	struct ub_ctx *ctx;
+};
+
+/**
+ * query method implementation
+ */
+METHOD(resolver_t, query, resolver_response_t*,
+	private_resolver_t *this, char *domain, rr_class_t rr_class,
+	rr_type_t rr_type)
+{
+	unbound_response_t *response = NULL;
+	struct ub_result *result = NULL;
+	int ub_retval;
+
+	ub_retval = ub_resolve(this->ctx, domain, rr_type, rr_class, &result);
+	if (ub_retval)
+	{
+		DBG1(DBG_LIB, "unbound resolver error: %s", ub_strerror(ub_retval));
+		ub_resolve_free(result);
+		return NULL;
+	}
+
+	response = unbound_response_create_frm_libub_response(result);
+	if (!response)
+	{
+		DBG1(DBG_LIB, "unbound resolver failed to create response");
+		ub_resolve_free(result);
+		return NULL;
+	}
+	ub_resolve_free(result);
+
+	return (resolver_response_t*)response;
+}
+
+/**
+ * destroy method implementation
+ */
+METHOD(resolver_t, destroy, void,
+	private_resolver_t *this)
+{
+	ub_ctx_delete(this->ctx);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+resolver_t *unbound_resolver_create(void)
+{
+	private_resolver_t *this;
+	int ub_retval = 0;
+	char *resolv_conf_file;
+	char *trust_anchor_file;
+
+	resolv_conf_file = lib->settings->get_str(lib->settings,
+						"libstrongswan.plugins.unbound.resolv_conf",
+						RESOLV_CONF_FILE);
+
+	trust_anchor_file = lib->settings->get_str(lib->settings,
+						"libstrongswan.plugins.unbound.trust_anchors",
+						TRUST_ANCHOR_FILE);
+
+	INIT(this,
+		.public = {
+			.query = _query,
+			.destroy = _destroy,
+		},
+	);
+
+	this->ctx = ub_ctx_create();
+	if (!this->ctx)
+	{
+		DBG1(DBG_LIB, "failed to create unbound resolver context");
+		destroy(this);
+		return NULL;
+	}
+
+	DBG1(DBG_CFG, "loading unbound resolver config from '%s'", resolv_conf_file);
+	ub_retval = ub_ctx_resolvconf(this->ctx, resolv_conf_file);
+	if (ub_retval)
+	{
+		DBG1(DBG_CFG, "failed to read the resolver config: %s (%s)",
+					   ub_strerror(ub_retval), strerror(errno));
+		destroy(this);
+		return NULL;
+	}
+
+	DBG1(DBG_CFG, "loading unbound trust anchors from '%s'", trust_anchor_file);
+	ub_retval = ub_ctx_add_ta_file(this->ctx, trust_anchor_file);
+	if (ub_retval)
+	{
+		DBG1(DBG_CFG, "failed to load trust anchors: %s (%s)",
+					   ub_strerror(ub_retval), strerror(errno));
+	}
+
+	return &this->public;
+}
+