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/*
*
* The Sleuth Kit
*
* Copyright 2013-2015 Basis Technology Corp.
* Contact: carrier <at> sleuthkit <dot> org
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This is a C++ port of the Rejistry library developed by Willi Ballenthin.
* See https://github.com/williballenthin/Rejistry for the original Java version.
*/
/**
* \file VKRecord.cpp
*
*/
// Local includes
#include "VKRecord.h"
#include "RejistryException.h"
#include "REGFHeader.h"
namespace Rejistry {
const std::string VKRecord::MAGIC = "vk";
const std::wstring VKRecord::DEFAULT_VALUE_NAME = L"(Default)";
VKRecord::VKRecord(RegistryByteBuffer * buf, uint32_t offset) : Record(buf, offset) {
if (!(getMagic() == MAGIC)) {
throw RegistryParseException("VKRecord magic value not found.");
}
}
VKRecord::VKRecord(const VKRecord& sourceRecord) : Record(sourceRecord._buf, sourceRecord._offset) {
}
bool VKRecord::hasName() const {
return (getWord(NAME_LENGTH_OFFSET) != 0x0);
}
bool VKRecord::hasAsciiName() const {
return (getWord(NAME_FLAGS_OFFSET) & 0x1) == 0x1;
}
std::wstring VKRecord::getName() const {
if (! hasName()) {
return VKRecord::DEFAULT_VALUE_NAME;
}
uint32_t nameLength = getWord(NAME_LENGTH_OFFSET);
uint32_t numOfChars = hasAsciiName() ? nameLength : (nameLength / 2); // CT-2984
if (numOfChars > MAX_NAME_LENGTH) {
throw RegistryParseException("Value name length exceeds maximum length.");
}
if (hasAsciiName()) {
// TODO: This is a little hacky but it should work fine
// for ASCII strings.
std::vector<uint8_t> name = getData(NAME_OFFSET_OFFSET, nameLength);
return std::wstring(name.begin(), name.end());
}
return getUTF16String(NAME_OFFSET_OFFSET, nameLength);
}
ValueData::VALUE_TYPES VKRecord::getValueType() const {
return (ValueData::VALUE_TYPES)getDWord(VALUE_TYPE_OFFSET);
}
uint32_t VKRecord::getDataLength() const {
uint32_t size = getDWord(DATA_LENGTH_OFFSET);
if (size >= LARGE_DATA_SIZE){
size -= LARGE_DATA_SIZE;
}
return size;
}
uint32_t VKRecord::getRawDataLength() const {
return getDWord(DATA_LENGTH_OFFSET);
}
uint32_t VKRecord::getDataOffset() const {
if (getRawDataLength() < SMALL_DATA_SIZE || getRawDataLength() >= LARGE_DATA_SIZE) {
return _offset + DATA_OFFSET_OFFSET;
} else {
return REGFHeader::FIRST_HBIN_OFFSET + getDWord(DATA_OFFSET_OFFSET);
}
}
ValueData::ValueDataPtr VKRecord::getValue() const {
uint32_t length = getRawDataLength();
uint32_t offset = getDataOffset();
if (length > LARGE_DATA_SIZE + DB_DATA_SIZE) {
throw RegistryParseException("Value size too large.");
}
RegistryByteBuffer * data = NULL;
switch (getValueType()) {
case ValueData::VALTYPE_BIN:
case ValueData::VALTYPE_NONE:
case ValueData::VALTYPE_SZ:
case ValueData::VALTYPE_EXPAND_SZ:
case ValueData::VALTYPE_MULTI_SZ:
case ValueData::VALTYPE_LINK:
case ValueData::VALTYPE_RESOURCE_LIST:
case ValueData::VALTYPE_FULL_RESOURCE_DESCRIPTOR:
case ValueData::VALTYPE_RESOURCE_REQUIREMENTS_LIST:
if (length >= LARGE_DATA_SIZE) {
uint32_t bufSize = length - LARGE_DATA_SIZE;
data = new RegistryByteBuffer(new ByteBuffer(getData(DATA_OFFSET_OFFSET, bufSize), bufSize));
}
else if (DB_DATA_SIZE < length && length < LARGE_DATA_SIZE) {
std::auto_ptr< Cell > c(new Cell(_buf, offset));
if (c.get() == NULL) {
throw RegistryParseException("Failed to create Cell for Value data.");
}
try {
std::auto_ptr< DBRecord > db(c->getDBRecord());
if (db.get() == NULL) {
throw RegistryParseException("Failed to create Cell for DBRecord.");
}
data = new RegistryByteBuffer(new ByteBuffer(db->getData(length), length));
}
catch (RegistryParseException& ) {
data = new RegistryByteBuffer(new ByteBuffer(c->getData(), length));
}
}
else {
std::auto_ptr< Cell > c(new Cell(_buf, offset));
if (c.get() == NULL) {
throw RegistryParseException("Failed to create Cell for Value data.");
}
ByteBuffer * byteBuffer = new ByteBuffer(c->getData(), length);
data = new RegistryByteBuffer(byteBuffer);
}
break;
case ValueData::VALTYPE_DWORD:
case ValueData::VALTYPE_BIG_ENDIAN:
data = new RegistryByteBuffer(new ByteBuffer(getData(DATA_OFFSET_OFFSET, 0x4), 0x4));
break;
case ValueData::VALTYPE_QWORD:
{
std::auto_ptr< Cell > c(new Cell(_buf, offset));
if (c.get() == NULL) {
throw RegistryParseException("Failed to create Cell for Value data.");
}
ByteBuffer * byteBuffer = new ByteBuffer(c->getData(), length);
data = new RegistryByteBuffer(byteBuffer);
}
break;
default:
// Unknown registry type. Create an empty buffer.
data = new RegistryByteBuffer(new ByteBuffer(0));
}
return new ValueData(data, getValueType());
}
};
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