implemented dynamic detection of TNCCS protocol

1 files changed, 140 insertions, 0 deletions

diff --git a/src/libcharon/plugins/tnccs_dynamic/tnccs_dynamic.c b/src/libcharon/plugins/tnccs_dynamic/tnccs_dynamic.c
new file mode 100644
index 000000000..f7ef5d98a
--- /dev/null
+++ b/src/libcharon/plugins/tnccs_dynamic/tnccs_dynamic.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2011 Andreas Steffen
+ * HSR 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 "tnccs_dynamic.h"
+
+#include <tnc/tnccs/tnccs.h>
+#include <daemon.h>
+
+typedef struct private_tnccs_dynamic_t private_tnccs_dynamic_t;
+
+/**
+ * Private data of a tnccs_dynamic_t object.
+ */
+struct private_tnccs_dynamic_t {
+
+	/**
+	 * Public tls_t interface.
+	 */
+	tls_t public;
+
+	/**
+	 * Detected TNC IF-TNCCS stack
+	 */
+	tls_t *tls;
+};
+
+tnccs_type_t determine_tnccs_protocol(char version)
+{
+	switch (version)
+	{
+		case '\t':
+		case '\n':
+		case '\r':
+		case ' ':
+		case '<':
+			return TNCCS_1_1;
+		case 0x00:
+			return TNCCS_SOH;
+		case 0x02:
+			return TNCCS_2_0;
+		default:
+			return TNCCS_UNKNOWN;
+	}
+}
+
+METHOD(tls_t, process, status_t,
+	private_tnccs_dynamic_t *this, void *buf, size_t buflen)
+{
+	tnccs_type_t type;
+
+	if (!this->tls)
+	{
+		if (buflen == 0)
+		{
+			return FAILED;
+		}
+		type = determine_tnccs_protocol(*(char*)buf);
+		DBG1(DBG_TNC, "%N protocol detected dynamically",
+					   tnccs_type_names, type);
+		this->tls = (tls_t*)charon->tnccs->create_instance(charon->tnccs,
+														   type, TRUE);
+		if (!this->tls)
+		{
+			DBG1(DBG_TNC, "N% protocol not supported", tnccs_type_names, type);
+			return FAILED;
+		}
+	}
+	return this->tls->process(this->tls, buf, buflen);
+}
+
+METHOD(tls_t, build, status_t,
+	private_tnccs_dynamic_t *this, void *buf, size_t *buflen, size_t *msglen)
+{
+	return this->tls->build(this->tls, buf, buflen, msglen);
+}
+
+METHOD(tls_t, is_server, bool,
+	private_tnccs_dynamic_t *this)
+{
+	return TRUE;
+}
+
+METHOD(tls_t, get_purpose, tls_purpose_t,
+	private_tnccs_dynamic_t *this)
+{
+	return TLS_PURPOSE_EAP_TNC;
+}
+
+METHOD(tls_t, is_complete, bool,
+	private_tnccs_dynamic_t *this)
+{
+	return this->tls ? this->tls->is_complete(this->tls) : FALSE;
+}
+
+METHOD(tls_t, get_eap_msk, chunk_t,
+	private_tnccs_dynamic_t *this)
+{
+	return chunk_empty;
+}
+
+METHOD(tls_t, destroy, void,
+	private_tnccs_dynamic_t *this)
+{
+	DESTROY_IF(this->tls);
+	free(this);	
+}
+
+/**
+ * See header
+ */
+tls_t *tnccs_dynamic_create(bool is_server)
+{
+	private_tnccs_dynamic_t *this;
+
+	INIT(this,
+		.public = {
+			.process = _process,
+			.build = _build,
+			.is_server = _is_server,
+			.get_purpose = _get_purpose,
+			.is_complete = _is_complete,
+			.get_eap_msk = _get_eap_msk,
+			.destroy = _destroy,
+		},
+	);
+
+	return &this->public;
+}