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/*
* 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/tnc.h>
#include <debug.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;
};
/**
* Determine the version of the IF-TNCCS protocol used by analyzing the first
* byte of the TNCCS batch received from a TNC Client according to the rules
* defined by section 3.5 "Interoperability with older IF-TNCCS versions" of
* the TCG TNC IF-TNCCS TLV Bindings Version 2.0 standard.
*/
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*)tnc->tnccs->create_instance(tnc->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;
}
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