unbound: Implemented rr_t as unbound_rr_t

src/libstrongswan/plugins/unbound/Makefile.am

@@ -10,7 +10,9 @@ plugin_LTLIBRARIES = libstrongswan-unbound.la
 endif
 
 libstrongswan_unbound_la_SOURCES = \
-	unbound_plugin.h unbound_plugin.c unbound_resolver.c unbound_resolver.h
+	unbound_plugin.h unbound_plugin.c \
+	unbound_resolver.c unbound_resolver.h \
+	unbound_rr.h unbound_rr.c
 
 libstrongswan_unbound_la_LDFLAGS = -module -avoid-version
 libstrongswan_unbound_la_LIBADD  = -lunbound -lldns

src/libstrongswan/plugins/unbound/unbound_rr.c

@@ -0,0 +1,164 @@
+/*
+ * Copyright (C) 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 <resolver/rr.h>
+
+#include <library.h>
+#include <utils/debug.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "unbound_rr.h"
+
+typedef struct private_unbound_rr_t private_unbound_rr_t;
+
+/**
+ * private data of an unbound_rr_t object.
+ */
+struct private_unbound_rr_t {
+
+	/**
+	 * Public data
+	 */
+	unbound_rr_t public;
+
+	/**
+	 * Owner name
+	 */
+	char* name;
+
+	/**
+	 * Type
+	 */
+	rr_type_t type;
+
+	/**
+	 * Class
+	 */
+	rr_class_t class;
+
+	/**
+	 * TTL
+	 */
+	uint32_t ttl;
+
+	/**
+	 * Size of the rdata field in octets
+	 */
+	uint16_t size;
+
+	/**
+	 * RDATA field (array of bytes in network order)
+	 */
+	u_char *rdata;
+};
+
+METHOD(rr_t, get_name, char *,
+	private_unbound_rr_t *this)
+{
+	return this->name;
+}
+
+METHOD(rr_t, get_type, rr_type_t,
+	private_unbound_rr_t *this)
+{
+	return this->type;
+}
+
+METHOD(rr_t, get_class, rr_class_t,
+	private_unbound_rr_t *this)
+{
+	return this->class;
+}
+
+METHOD(rr_t, get_ttl, uint32_t,
+	private_unbound_rr_t *this)
+{
+	return this->ttl;
+}
+
+METHOD(rr_t, get_rdata, chunk_t,
+	private_unbound_rr_t *this)
+{
+	return chunk_create(this->rdata, this->size);
+}
+
+METHOD(rr_t, destroy, void,
+	private_unbound_rr_t *this)
+{
+	free(this->name);
+	free(this->rdata);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+unbound_rr_t *unbound_rr_create_frm_ldns_rr(ldns_rr *rr)
+{
+	private_unbound_rr_t *this;
+	ldns_status status;
+	ldns_buffer *buf;
+	int i;
+
+	INIT(this,
+		.public = {
+			.interface = {
+				.get_name = _get_name,
+				.get_type = _get_type,
+				.get_class = _get_class,
+				.get_ttl = _get_ttl,
+				.get_rdata = _get_rdata,
+				.destroy = _destroy,
+			},
+		},
+	);
+
+	this->name = ldns_rdf2str(ldns_rr_owner(rr));
+	if (!this->name)
+	{
+		DBG1(DBG_LIB, "failed to parse the owner name of a DNS RR");
+		_destroy(this);
+		return NULL;
+	}
+
+	this->type = ldns_rr_get_type(rr);
+	this->class = ldns_rr_get_class(rr);
+	this->ttl = ldns_rr_ttl(rr);
+	for(i = 0; i < ldns_rr_rd_count(rr); i++)
+	{
+		this->size += ldns_rdf_size(ldns_rr_rdf(rr, i));
+	}
+
+	/**
+	 * The ldns library splits the RDATA field of a RR in various rdf.
+	 * Here we reassemble these rdf to get the RDATA field of the RR.
+	 */
+	buf = ldns_buffer_new(LDNS_MIN_BUFLEN);
+	/* The buffer will be resized automatically by ldns_rr_rdata2buffer_wire() */
+	status = ldns_rr_rdata2buffer_wire(buf, rr);
+
+	if (status != LDNS_STATUS_OK)
+	{
+		DBG1(DBG_LIB, "failed to get the RDATA field of a DNS RR");
+		_destroy(this);
+		return NULL;
+	}
+
+	this->rdata = ldns_buffer_export(buf);
+
+	return &this->public;
+}

src/libstrongswan/plugins/unbound/unbound_rr.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 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.
+ */
+
+/**
+ * @defgroup unbound_rr unbound_rr
+ * @{ @ingroup unbound_p
+ */
+
+#ifndef UNBOUND_RR_H_
+#define UNBOUND_RR_H_
+
+#include <resolver/rr.h>
+#include <ldns/ldns.h>
+
+typedef struct unbound_rr_t unbound_rr_t;
+
+/**
+ * Implementation of the Resource Record interface using libunbound and libldns.
+ */
+struct unbound_rr_t {
+
+	/**
+	 * Implements the Resource Record interface
+	 */
+	rr_t interface;
+};
+
+/**
+ * Create an unbound_rr instance from a Resource Record given by
+ * a ldns_struct_rr from the ldns library.
+ *
+ * @return		Resource Record, NULL on error
+ */
+unbound_rr_t *unbound_rr_create_frm_ldns_rr(ldns_rr *rr);
+
+#endif /** UNBOUND_RR_H_ @}*/