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/*
* Copyright (C) 2010 Sansar Choinyanbuu
* Copyright (C) 2010 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 "pb_pa_msg.h"
#include <tnc/tnccs/tnccs.h>
#include <bio/bio_writer.h>
#include <bio/bio_reader.h>
#include <pen/pen.h>
#include <utils/debug.h>
typedef struct private_pb_pa_msg_t private_pb_pa_msg_t;
/**
* PB-PA message
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Flags | PA Message Vendor ID |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | PA Subtype |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Posture Collector Identifier | Posture Validator Identifier |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | PA Message Body (Variable Length) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
#define PA_FLAG_NONE 0x00
#define PA_FLAG_EXCL (1<<7)
#define PA_RESERVED_SUBTYPE 0xffffffff
/**
* Private data of a pb_pa_msg_t object.
*
*/
struct private_pb_pa_msg_t {
/**
* Public pb_pa_msg_t interface.
*/
pb_pa_msg_t public;
/**
* PB-TNC message type
*/
pb_tnc_msg_type_t type;
/**
* Exclusive flag
*/
bool excl;
/**
* Vendor-specific PA Subtype
*/
pen_type_t subtype;
/**
* Posture Validator Identifier
*/
u_int16_t collector_id;
/**
* Posture Validator Identifier
*/
u_int16_t validator_id;
/**
* PA Message Body
*/
chunk_t msg_body;
/**
* Encoded message
*/
chunk_t encoding;
};
METHOD(pb_tnc_msg_t, get_type, pb_tnc_msg_type_t,
private_pb_pa_msg_t *this)
{
return this->type;
}
METHOD(pb_tnc_msg_t, get_encoding, chunk_t,
private_pb_pa_msg_t *this)
{
return this->encoding;
}
METHOD(pb_tnc_msg_t, build, void,
private_pb_pa_msg_t *this)
{
chunk_t msg_header;
bio_writer_t *writer;
if (this->encoding.ptr)
{
return;
}
/* build message header */
writer = bio_writer_create(64);
writer->write_uint8 (writer, this->excl ? PA_FLAG_EXCL : PA_FLAG_NONE);
writer->write_uint24(writer, this->subtype.vendor_id);
writer->write_uint32(writer, this->subtype.type);
writer->write_uint16(writer, this->collector_id);
writer->write_uint16(writer, this->validator_id);
msg_header = writer->get_buf(writer);
/* create encoding by concatenating message header and message body */
this->encoding = chunk_cat("cc", msg_header, this->msg_body);
writer->destroy(writer);
}
METHOD(pb_tnc_msg_t, process, status_t,
private_pb_pa_msg_t *this, u_int32_t *offset)
{
u_int8_t flags;
size_t msg_body_len;
bio_reader_t *reader;
/* process message header */
reader = bio_reader_create(this->encoding);
reader->read_uint8 (reader, &flags);
reader->read_uint24(reader, &this->subtype.vendor_id);
reader->read_uint32(reader, &this->subtype.type);
reader->read_uint16(reader, &this->collector_id);
reader->read_uint16(reader, &this->validator_id);
this->excl = ((flags & PA_FLAG_EXCL) != PA_FLAG_NONE);
/* process message body */
msg_body_len = reader->remaining(reader);
if (msg_body_len)
{
reader->read_data(reader, msg_body_len, &this->msg_body);
this->msg_body = chunk_clone(this->msg_body);
}
reader->destroy(reader);
if (this->subtype.vendor_id == PEN_RESERVED)
{
DBG1(DBG_TNC, "Vendor ID 0x%06x is reserved", PEN_RESERVED);
*offset = 1;
return FAILED;
}
if (this->subtype.type == PA_RESERVED_SUBTYPE)
{
DBG1(DBG_TNC, "PA Subtype 0x%08x is reserved", PA_RESERVED_SUBTYPE);
*offset = 4;
return FAILED;
}
return SUCCESS;
}
METHOD(pb_tnc_msg_t, destroy, void,
private_pb_pa_msg_t *this)
{
free(this->encoding.ptr);
free(this->msg_body.ptr);
free(this);
}
METHOD(pb_pa_msg_t, get_subtype, pen_type_t,
private_pb_pa_msg_t *this)
{
return this->subtype;
}
METHOD(pb_pa_msg_t, get_collector_id, u_int16_t,
private_pb_pa_msg_t *this)
{
return this->collector_id;
}
METHOD(pb_pa_msg_t, get_validator_id, u_int16_t,
private_pb_pa_msg_t *this)
{
return this->validator_id;
}
METHOD(pb_pa_msg_t, get_body, chunk_t,
private_pb_pa_msg_t *this)
{
return this->msg_body;
}
METHOD(pb_pa_msg_t, get_exclusive_flag, bool,
private_pb_pa_msg_t *this)
{
return this->excl;
}
/**
* See header
*/
pb_tnc_msg_t *pb_pa_msg_create_from_data(chunk_t data)
{
private_pb_pa_msg_t *this;
INIT(this,
.public = {
.pb_interface = {
.get_type = _get_type,
.get_encoding = _get_encoding,
.process = _process,
.destroy = _destroy,
},
.get_subtype = _get_subtype,
.get_collector_id = _get_collector_id,
.get_validator_id = _get_validator_id,
.get_body = _get_body,
.get_exclusive_flag = _get_exclusive_flag,
},
.type = PB_MSG_PA,
.encoding = chunk_clone(data),
);
return &this->public.pb_interface;
}
/**
* See header
*/
pb_tnc_msg_t *pb_pa_msg_create(u_int32_t vendor_id, u_int32_t subtype,
u_int16_t collector_id, u_int16_t validator_id,
bool excl, chunk_t msg_body)
{
private_pb_pa_msg_t *this;
INIT(this,
.public = {
.pb_interface = {
.get_type = _get_type,
.get_encoding = _get_encoding,
.build = _build,
.process = _process,
.destroy = _destroy,
},
.get_subtype= _get_subtype,
.get_collector_id = _get_collector_id,
.get_validator_id = _get_validator_id,
.get_body = _get_body,
.get_exclusive_flag = _get_exclusive_flag,
},
.type = PB_MSG_PA,
.subtype = { vendor_id, subtype },
.collector_id = collector_id,
.validator_id = validator_id,
.excl = excl,
.msg_body = chunk_clone(msg_body),
);
return &this->public.pb_interface;
}
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