/*
* Copyright (C) 2017 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 "ietf_swima_attr_req.h"
#include "swima/swima_record.h"
#include <pa_tnc/pa_tnc_msg.h>
#include <bio/bio_writer.h>
#include <bio/bio_reader.h>
#include <utils/debug.h>
#include <collections/linked_list.h>
typedef struct private_ietf_swima_attr_req_t private_ietf_swima_attr_req_t;
/**
* SW Request
* see section 5.7 of RFC 8412 SWIMA
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |C|S|R| Reserved| Software Identifier Count |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Request ID |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Earliest EID |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Software Identifier Length | Software Identifier (Var Len) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
#define SW_REQ_RESERVED_MASK 0xE0
/**
* Private data of an ietf_swima_attr_req_t object.
*/
struct private_ietf_swima_attr_req_t {
/**
* Public members of ietf_swima_attr_req_t
*/
ietf_swima_attr_req_t public;
/**
* Vendor-specific attribute type
*/
pen_type_t type;
/**
* Length of attribute value
*/
size_t length;
/**
* Attribute value or segment
*/
chunk_t value;
/**
* Noskip flag
*/
bool noskip_flag;
/**
* SWID request flags
*/
uint8_t flags;
/**
* Request ID
*/
uint32_t request_id;
/**
* Inventory of Target Software Identifiers
*/
swima_inventory_t *targets;
/**
* Reference count
*/
refcount_t ref;
};
METHOD(pa_tnc_attr_t, get_type, pen_type_t,
private_ietf_swima_attr_req_t *this)
{
return this->type;
}
METHOD(pa_tnc_attr_t, get_value, chunk_t,
private_ietf_swima_attr_req_t *this)
{
return this->value;
}
METHOD(pa_tnc_attr_t, get_noskip_flag, bool,
private_ietf_swima_attr_req_t *this)
{
return this->noskip_flag;
}
METHOD(pa_tnc_attr_t, set_noskip_flag,void,
private_ietf_swima_attr_req_t *this, bool noskip)
{
this->noskip_flag = noskip;
}
METHOD(pa_tnc_attr_t, build, void,
private_ietf_swima_attr_req_t *this)
{
bio_writer_t *writer;
swima_record_t *sw_record;
uint32_t earliest_eid;
chunk_t sw_id;
enumerator_t *enumerator;
if (this->value.ptr)
{
return;
}
earliest_eid = this->targets->get_eid(this->targets, NULL);
writer = bio_writer_create(IETF_SWIMA_REQ_MIN_SIZE);
writer->write_uint8 (writer, this->flags);
writer->write_uint24(writer, this->targets->get_count(this->targets));
writer->write_uint32(writer, this->request_id);
writer->write_uint32(writer, earliest_eid);
enumerator = this->targets->create_enumerator(this->targets);
while (enumerator->enumerate(enumerator, &sw_record))
{
sw_id = sw_record->get_sw_id(sw_record, NULL);
writer->write_data16(writer, sw_id);
}
enumerator->destroy(enumerator);
this->value = writer->extract_buf(writer);
this->length = this->value.len;
writer->destroy(writer);
}
METHOD(pa_tnc_attr_t, process, status_t,
private_ietf_swima_attr_req_t *this, uint32_t *offset)
{
bio_reader_t *reader;
swima_record_t *sw_record;
uint32_t sw_id_count, earliest_eid;
chunk_t sw_id;
*offset = 0;
if (this->value.len < this->length)
{
return NEED_MORE;
}
if (this->value.len < IETF_SWIMA_REQ_MIN_SIZE)
{
DBG1(DBG_TNC, "insufficient data for SW Request");
return FAILED;
}
reader = bio_reader_create(this->value);
reader->read_uint8 (reader, &this->flags);
reader->read_uint24(reader, &sw_id_count);
reader->read_uint32(reader, &this->request_id);
reader->read_uint32(reader, &earliest_eid);
*offset = IETF_SWIMA_REQ_MIN_SIZE;
this->flags &= SW_REQ_RESERVED_MASK;
this->targets->set_eid(this->targets, earliest_eid, 0);
while (sw_id_count--)
{
if (!reader->read_data16(reader, &sw_id))
{
DBG1(DBG_TNC, "insufficient data for Software ID");
reader->destroy(reader);
return FAILED;
}
*offset += 2 + sw_id.len;
sw_record = swima_record_create(0, sw_id, chunk_empty);
this->targets->add(this->targets, sw_record);
}
reader->destroy(reader);
return SUCCESS;
}
METHOD(pa_tnc_attr_t, add_segment, void,
private_ietf_swima_attr_req_t *this, chunk_t segment)
{
this->value = chunk_cat("mc", this->value, segment);
}
METHOD(pa_tnc_attr_t, get_ref, pa_tnc_attr_t*,
private_ietf_swima_attr_req_t *this)
{
ref_get(&this->ref);
return &this->public.pa_tnc_attribute;
}
METHOD(pa_tnc_attr_t, destroy, void,
private_ietf_swima_attr_req_t *this)
{
if (ref_put(&this->ref))
{
this->targets->destroy(this->targets);
free(this->value.ptr);
free(this);
}
}
METHOD(ietf_swima_attr_req_t, get_flags, uint8_t,
private_ietf_swima_attr_req_t *this)
{
return this->flags;
}
METHOD(ietf_swima_attr_req_t, get_request_id, uint32_t,
private_ietf_swima_attr_req_t *this)
{
return this->request_id;
}
METHOD(ietf_swima_attr_req_t, set_targets, void,
private_ietf_swima_attr_req_t *this, swima_inventory_t *targets)
{
this->targets->destroy(this->targets);
this->targets = targets->get_ref(targets);
}
METHOD(ietf_swima_attr_req_t, get_targets, swima_inventory_t*,
private_ietf_swima_attr_req_t *this)
{
return this->targets;
}
/**
* Described in header.
*/
pa_tnc_attr_t *ietf_swima_attr_req_create(uint8_t flags, uint32_t request_id)
{
private_ietf_swima_attr_req_t *this;
INIT(this,
.public = {
.pa_tnc_attribute = {
.get_type = _get_type,
.get_value = _get_value,
.get_noskip_flag = _get_noskip_flag,
.set_noskip_flag = _set_noskip_flag,
.build = _build,
.process = _process,
.add_segment = _add_segment,
.get_ref = _get_ref,
.destroy = _destroy,
},
.get_flags = _get_flags,
.get_request_id = _get_request_id,
.set_targets = _set_targets,
.get_targets = _get_targets,
},
.type = { PEN_IETF, IETF_ATTR_SWIMA_REQUEST },
.flags = flags & SW_REQ_RESERVED_MASK,
.request_id = request_id,
.targets = swima_inventory_create(),
.ref = 1,
);
return &this->public.pa_tnc_attribute;
}
/**
* Described in header.
*/
pa_tnc_attr_t *ietf_swima_attr_req_create_from_data(size_t length, chunk_t data)
{
private_ietf_swima_attr_req_t *this;
INIT(this,
.public = {
.pa_tnc_attribute = {
.get_type = _get_type,
.get_value = _get_value,
.get_noskip_flag = _get_noskip_flag,
.set_noskip_flag = _set_noskip_flag,
.build = _build,
.process = _process,
.add_segment = _add_segment,
.get_ref = _get_ref,
.destroy = _destroy,
},
.get_flags = _get_flags,
.get_request_id = _get_request_id,
.set_targets = _set_targets,
.get_targets = _get_targets,
},
.type = { PEN_IETF, IETF_ATTR_SWIMA_REQUEST },
.length = length,
.value = chunk_clone(data),
.targets = swima_inventory_create(),
.ref = 1,
);
return &this->public.pa_tnc_attribute;
}
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