390 lines
9.4 KiB
C
390 lines
9.4 KiB
C
/*
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* Copyright (C) 2013-2014 Andreas Steffen
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* HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "tcg_swid_attr_tag_inv.h"
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#include <pa_tnc/pa_tnc_msg.h>
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#include <bio/bio_writer.h>
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#include <bio/bio_reader.h>
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#include <utils/debug.h>
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typedef struct private_tcg_swid_attr_tag_inv_t private_tcg_swid_attr_tag_inv_t;
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/**
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* SWID Tag Inventory
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* see section 4.10 of TCG TNC SWID Message and Attributes for IF-M
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*
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* 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reserved | Tag ID Count |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Request ID Copy |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | EID Epoch |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Last EID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Instance ID Length | Instance ID (var. length) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Tag Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Tag (Variable) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#define TCG_SWID_TAG_INV_RESERVED 0x00
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/**
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* Private data of an tcg_swid_attr_tag_inv_t object.
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*/
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struct private_tcg_swid_attr_tag_inv_t {
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/**
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* Public members of tcg_swid_attr_tag_inv_t
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*/
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tcg_swid_attr_tag_inv_t public;
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/**
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* Vendor-specific attribute type
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*/
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pen_type_t type;
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/**
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* Length of attribute value
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*/
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size_t length;
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/**
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* Offset up to which attribute value has been processed
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*/
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size_t offset;
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/**
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* Current position of attribute value pointer
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*/
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chunk_t value;
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/**
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* Contains complete attribute or current segment
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*/
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chunk_t segment;
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/**
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* Noskip flag
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*/
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bool noskip_flag;
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/**
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* Request ID
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*/
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uint32_t request_id;
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/**
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* Event ID Epoch
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*/
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uint32_t eid_epoch;
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/**
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* Last Event ID
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*/
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uint32_t last_eid;
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/**
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* Number of SWID Tags in attribute
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*/
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uint32_t tag_count;
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/**
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* SWID Tag Inventory
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*/
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swid_inventory_t *inventory;
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/**
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* Reference count
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*/
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refcount_t ref;
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};
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METHOD(pa_tnc_attr_t, get_type, pen_type_t,
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private_tcg_swid_attr_tag_inv_t *this)
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{
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return this->type;
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}
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METHOD(pa_tnc_attr_t, get_value, chunk_t,
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private_tcg_swid_attr_tag_inv_t *this)
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{
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return this->value;
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}
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METHOD(pa_tnc_attr_t, get_noskip_flag, bool,
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private_tcg_swid_attr_tag_inv_t *this)
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{
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return this->noskip_flag;
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}
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METHOD(pa_tnc_attr_t, set_noskip_flag,void,
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private_tcg_swid_attr_tag_inv_t *this, bool noskip)
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{
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this->noskip_flag = noskip;
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}
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METHOD(pa_tnc_attr_t, build, void,
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private_tcg_swid_attr_tag_inv_t *this)
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{
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bio_writer_t *writer;
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swid_tag_t *tag;
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enumerator_t *enumerator;
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if (this->value.ptr)
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{
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return;
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}
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writer = bio_writer_create(TCG_SWID_TAG_INV_MIN_SIZE);
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writer->write_uint8 (writer, TCG_SWID_TAG_INV_RESERVED);
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writer->write_uint24(writer, this->inventory->get_count(this->inventory));
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writer->write_uint32(writer, this->request_id);
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writer->write_uint32(writer, this->eid_epoch);
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writer->write_uint32(writer, this->last_eid);
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enumerator = this->inventory->create_enumerator(this->inventory);
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while (enumerator->enumerate(enumerator, &tag))
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{
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writer->write_data16(writer, tag->get_instance_id(tag));
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writer->write_data32(writer, tag->get_encoding(tag));
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}
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enumerator->destroy(enumerator);
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this->value = writer->extract_buf(writer);
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this->segment = this->value;
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this->length = this->value.len;
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writer->destroy(writer);
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}
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METHOD(pa_tnc_attr_t, process, status_t,
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private_tcg_swid_attr_tag_inv_t *this, uint32_t *offset)
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{
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bio_reader_t *reader;
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uint8_t reserved;
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chunk_t tag_encoding, instance_id;
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swid_tag_t *tag;
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status_t status = NEED_MORE;
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if (this->offset == 0)
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{
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if (this->length < TCG_SWID_TAG_INV_MIN_SIZE)
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{
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DBG1(DBG_TNC, "insufficient data for %N/%N", pen_names, PEN_TCG,
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tcg_attr_names, this->type.type);
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*offset = this->offset;
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return FAILED;
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}
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if (this->value.len < TCG_SWID_TAG_INV_MIN_SIZE)
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{
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return NEED_MORE;
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}
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reader = bio_reader_create(this->value);
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reader->read_uint8 (reader, &reserved);
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reader->read_uint24(reader, &this->tag_count);
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reader->read_uint32(reader, &this->request_id);
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reader->read_uint32(reader, &this->eid_epoch);
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reader->read_uint32(reader, &this->last_eid);
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this->offset = TCG_SWID_TAG_INV_MIN_SIZE;
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this->value = reader->peek(reader);
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reader->destroy(reader);
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}
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reader = bio_reader_create(this->value);
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while (this->tag_count)
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{
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if (!reader->read_data16(reader, &instance_id) ||
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!reader->read_data32(reader, &tag_encoding))
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{
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goto end;
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}
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tag = swid_tag_create(tag_encoding, instance_id);
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this->inventory->add(this->inventory, tag);
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this->offset += this->value.len - reader->remaining(reader);
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this->value = reader->peek(reader);
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/* at least one tag was processed */
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status = SUCCESS;
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this->tag_count--;
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}
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if (this->length != this->offset)
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{
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DBG1(DBG_TNC, "inconsistent length for %N/%N", pen_names, PEN_TCG,
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tcg_attr_names, this->type.type);
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*offset = this->offset;
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status = FAILED;
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}
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end:
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reader->destroy(reader);
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return status;
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}
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METHOD(pa_tnc_attr_t, add_segment, void,
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private_tcg_swid_attr_tag_inv_t *this, chunk_t segment)
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{
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this->value = chunk_cat("cc", this->value, segment);
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chunk_free(&this->segment);
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this->segment = this->value;
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}
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METHOD(pa_tnc_attr_t, get_ref, pa_tnc_attr_t*,
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private_tcg_swid_attr_tag_inv_t *this)
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{
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ref_get(&this->ref);
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return &this->public.pa_tnc_attribute;
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}
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METHOD(pa_tnc_attr_t, destroy, void,
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private_tcg_swid_attr_tag_inv_t *this)
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{
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if (ref_put(&this->ref))
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{
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this->inventory->destroy(this->inventory);
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free(this->segment.ptr);
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free(this);
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}
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}
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METHOD(tcg_swid_attr_tag_inv_t, add, void,
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private_tcg_swid_attr_tag_inv_t *this, swid_tag_t *tag)
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{
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this->inventory->add(this->inventory, tag);
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}
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METHOD(tcg_swid_attr_tag_inv_t, get_request_id, uint32_t,
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private_tcg_swid_attr_tag_inv_t *this)
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{
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return this->request_id;
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}
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METHOD(tcg_swid_attr_tag_inv_t, get_last_eid, uint32_t,
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private_tcg_swid_attr_tag_inv_t *this, uint32_t *eid_epoch)
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{
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if (eid_epoch)
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{
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*eid_epoch = this->eid_epoch;
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}
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return this->last_eid;
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}
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METHOD(tcg_swid_attr_tag_inv_t, get_tag_count, uint32_t,
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private_tcg_swid_attr_tag_inv_t *this)
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{
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return this->tag_count;
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}
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METHOD(tcg_swid_attr_tag_inv_t, get_inventory, swid_inventory_t*,
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private_tcg_swid_attr_tag_inv_t *this)
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{
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return this->inventory;
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}
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METHOD(tcg_swid_attr_tag_inv_t, clear_inventory, void,
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private_tcg_swid_attr_tag_inv_t *this)
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{
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this->inventory->destroy(this->inventory);
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this->inventory = swid_inventory_create(TRUE);
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}
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/**
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* Described in header.
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*/
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pa_tnc_attr_t *tcg_swid_attr_tag_inv_create(uint32_t request_id,
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uint32_t eid_epoch, uint32_t eid)
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{
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private_tcg_swid_attr_tag_inv_t *this;
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INIT(this,
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.public = {
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.pa_tnc_attribute = {
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.get_type = _get_type,
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.get_value = _get_value,
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.get_noskip_flag = _get_noskip_flag,
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.set_noskip_flag = _set_noskip_flag,
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.build = _build,
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.process = _process,
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.add_segment = _add_segment,
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.get_ref = _get_ref,
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.destroy = _destroy,
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},
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.add = _add,
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.get_request_id = _get_request_id,
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.get_last_eid = _get_last_eid,
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.get_tag_count = _get_tag_count,
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.get_inventory = _get_inventory,
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.clear_inventory = _clear_inventory,
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},
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.type = { PEN_TCG, TCG_SWID_TAG_INVENTORY },
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.request_id = request_id,
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.eid_epoch = eid_epoch,
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.last_eid = eid,
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.inventory = swid_inventory_create(TRUE),
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.ref = 1,
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);
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return &this->public.pa_tnc_attribute;
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}
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/**
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* Described in header.
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*/
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pa_tnc_attr_t *tcg_swid_attr_tag_inv_create_from_data(size_t length,
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chunk_t data)
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{
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private_tcg_swid_attr_tag_inv_t *this;
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INIT(this,
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.public = {
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.pa_tnc_attribute = {
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.get_type = _get_type,
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.get_value = _get_value,
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.get_noskip_flag = _get_noskip_flag,
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.set_noskip_flag = _set_noskip_flag,
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.build = _build,
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.process = _process,
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.add_segment = _add_segment,
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.get_ref = _get_ref,
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.destroy = _destroy,
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},
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.add = _add,
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.get_request_id = _get_request_id,
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.get_last_eid = _get_last_eid,
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.get_tag_count = _get_tag_count,
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.get_inventory = _get_inventory,
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.clear_inventory = _clear_inventory,
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},
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.type = { PEN_TCG, TCG_SWID_TAG_INVENTORY },
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.length = length,
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.segment = chunk_clone(data),
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.inventory = swid_inventory_create(TRUE),
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.ref = 1,
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);
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/* received either complete attribute value or first segment */
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this->value = this->segment;
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return &this->public.pa_tnc_attribute;
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}
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