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/*
* Copyright (C) 2010 Andreas Steffen
* Copyright (C) 2010 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 "eap_ttls_avp.h"
#include <debug.h>
#define AVP_EAP_MESSAGE 79
typedef struct private_eap_ttls_avp_t private_eap_ttls_avp_t;
/**
* Private data of an eap_ttls_avp_t object.
*/
struct private_eap_ttls_avp_t {
/**
* Public eap_ttls_avp_t interface.
*/
eap_ttls_avp_t public;
};
METHOD(eap_ttls_avp_t, build, void,
private_eap_ttls_avp_t *this, tls_writer_t *writer, chunk_t data)
{
char zero_padding[] = { 0x00, 0x00, 0x00 };
chunk_t avp_padding;
u_int8_t avp_flags;
u_int32_t avp_len;
avp_flags = 0x40;
avp_len = 8 + data.len;
avp_padding = chunk_create(zero_padding, (4 - data.len) % 4);
writer->write_uint32(writer, AVP_EAP_MESSAGE);
writer->write_uint8(writer, avp_flags);
writer->write_uint24(writer, avp_len);
writer->write_data(writer, data);
writer->write_data(writer, avp_padding);
}
METHOD(eap_ttls_avp_t, process, status_t,
private_eap_ttls_avp_t* this, tls_reader_t *reader, chunk_t *data)
{
u_int32_t avp_code;
u_int8_t avp_flags;
u_int32_t avp_len, data_len;
if (!reader->read_uint32(reader, &avp_code) ||
!reader->read_uint8(reader, &avp_flags) ||
!reader->read_uint24(reader, &avp_len))
{
DBG1(DBG_IKE, "received invalid AVP");
return FAILED;
}
if (avp_code != AVP_EAP_MESSAGE)
{
DBG1(DBG_IKE, "expected AVP_EAP_MESSAGE but received %u", avp_code);
return FAILED;
}
data_len = avp_len - 8;
if (!reader->read_data(reader, data_len + (4 - avp_len) % 4, data))
{
DBG1(DBG_IKE, "received insufficient AVP data");
return FAILED;
}
data->len = data_len;
return SUCCESS;
}
METHOD(eap_ttls_avp_t, destroy, void,
private_eap_ttls_avp_t *this)
{
free(this);
}
/**
* See header
*/
eap_ttls_avp_t *eap_ttls_avp_create(void)
{
private_eap_ttls_avp_t *this;
INIT(this,
.public= {
.process = _process,
.build = _build,
.destroy = _destroy,
},
);
return &this->public;
}
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