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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* 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.
*/
#include <implementation/socket_consumer.h>
#include <protocols/errors.h>
#include <protocols/manifest_incremental_indexer_bytestream.h>
#include <protocols/transport_protocol.h>
#include <cmath>
#include <deque>
namespace transport {
namespace protocol {
using namespace interface;
ManifestIncrementalIndexer::ManifestIncrementalIndexer(
implementation::ConsumerSocket *icn_socket, TransportProtocol *transport)
: IncrementalIndexer(icn_socket, transport),
suffix_strategy_(utils::SuffixStrategyFactory::getSuffixStrategy(
NextSegmentCalculationStrategy::INCREMENTAL, next_download_suffix_,
0)) {}
void ManifestIncrementalIndexer::onContentObject(
core::Interest &interest, core::ContentObject &content_object,
bool reassembly) {
switch (content_object.getPayloadType()) {
case PayloadType::DATA: {
DLOG_IF(INFO, VLOG_IS_ON(3))
<< "Received content " << content_object.getName();
onUntrustedContentObject(interest, content_object, reassembly);
break;
}
case PayloadType::MANIFEST: {
DLOG_IF(INFO, VLOG_IS_ON(3))
<< "Received manifest " << content_object.getName();
onUntrustedManifest(interest, content_object, reassembly);
break;
}
default: {
return;
}
}
}
void ManifestIncrementalIndexer::onUntrustedManifest(
core::Interest &interest, core::ContentObject &content_object,
bool reassembly) {
auto manifest =
std::make_unique<ContentObjectManifest>(std::move(content_object));
auth::VerificationPolicy policy = verifier_->verifyPackets(manifest.get());
manifest->decode();
if (policy != auth::VerificationPolicy::ACCEPT) {
transport_->onContentReassembled(
make_error_code(protocol_error::session_aborted));
return;
}
processTrustedManifest(interest, std::move(manifest), reassembly);
}
void ManifestIncrementalIndexer::processTrustedManifest(
core::Interest &interest, std::unique_ptr<ContentObjectManifest> manifest,
bool reassembly) {
if (TRANSPORT_EXPECT_FALSE(manifest->getVersion() !=
core::ManifestVersion::VERSION_1)) {
throw errors::RuntimeException("Received manifest with unknown version.");
}
switch (manifest->getManifestType()) {
case core::ManifestType::INLINE_MANIFEST: {
suffix_strategy_->setFinalSuffix(manifest->getFinalBlockNumber());
// The packets to verify with the received manifest
std::vector<auth::PacketPtr> packets;
// Convert the received manifest to a map of packet suffixes to hashes
auth::Verifier::SuffixMap current_manifest =
core::ContentObjectManifest::getSuffixMap(manifest.get());
// Update 'suffix_map_' with new hashes from the received manifest and
// build 'packets'
for (auto it = current_manifest.begin(); it != current_manifest.end();) {
if (unverified_segments_.find(it->first) ==
unverified_segments_.end()) {
suffix_map_[it->first] = std::move(it->second);
current_manifest.erase(it++);
continue;
}
packets.push_back(std::get<1>(unverified_segments_[it->first]).get());
it++;
}
// Verify unverified segments using the received manifest
auth::Verifier::PolicyMap policies =
verifier_->verifyPackets(packets, current_manifest);
for (unsigned int i = 0; i < packets.size(); ++i) {
auth::Suffix suffix = packets[i]->getName().getSuffix();
auto it = unverified_segments_.find(suffix);
if (policies[suffix] != auth::VerificationPolicy::UNKNOWN) {
unverified_segments_.erase(it);
continue;
}
applyPolicy(*std::get<0>(it->second), *std::get<1>(it->second),
std::get<2>(it->second), policies[suffix]);
}
if (reassembly) {
reassembly_->reassemble(std::move(manifest));
}
break;
}
case core::ManifestType::FLIC_MANIFEST: {
throw errors::NotImplementedException();
}
case core::ManifestType::FINAL_CHUNK_NUMBER: {
throw errors::NotImplementedException();
}
}
}
void ManifestIncrementalIndexer::onUntrustedContentObject(
Interest &interest, ContentObject &content_object, bool reassembly) {
auth::Suffix suffix = content_object.getName().getSuffix();
auth::VerificationPolicy policy =
verifier_->verifyPackets(&content_object, suffix_map_);
switch (policy) {
case auth::VerificationPolicy::UNKNOWN: {
unverified_segments_[suffix] =
std::make_tuple(interest.shared_from_this(),
content_object.shared_from_this(), reassembly);
break;
}
default: {
suffix_map_.erase(suffix);
break;
}
}
applyPolicy(interest, content_object, reassembly, policy);
}
void ManifestIncrementalIndexer::applyPolicy(
core::Interest &interest, core::ContentObject &content_object,
bool reassembly, auth::VerificationPolicy policy) {
assert(reassembly_);
switch (policy) {
case auth::VerificationPolicy::ACCEPT: {
if (reassembly && !reassembly_->reassembleUnverified()) {
reassembly_->reassemble(content_object);
}
break;
}
case auth::VerificationPolicy::DROP: {
transport_->onPacketDropped(
interest, content_object,
make_error_code(protocol_error::verification_failed));
break;
}
case auth::VerificationPolicy::ABORT: {
transport_->onContentReassembled(
make_error_code(protocol_error::session_aborted));
break;
}
case auth::VerificationPolicy::UNKNOWN: {
if (reassembly && reassembly_->reassembleUnverified()) {
reassembly_->reassemble(content_object);
}
}
}
}
uint32_t ManifestIncrementalIndexer::checkNextSuffix() {
return suffix_strategy_->getNextSuffix();
}
uint32_t ManifestIncrementalIndexer::getNextSuffix() {
auto ret = suffix_strategy_->getNextSuffix();
if (ret <= suffix_strategy_->getFinalSuffix() &&
ret != utils::SuffixStrategy::INVALID_SUFFIX) {
suffix_queue_.push(ret);
return ret;
}
return Indexer::invalid_index;
}
uint32_t ManifestIncrementalIndexer::getFinalSuffix() {
return suffix_strategy_->getFinalSuffix();
}
bool ManifestIncrementalIndexer::isFinalSuffixDiscovered() {
return IncrementalIndexer::isFinalSuffixDiscovered();
}
uint32_t ManifestIncrementalIndexer::getNextReassemblySegment() {
if (suffix_queue_.empty()) {
return Indexer::invalid_index;
}
auto ret = suffix_queue_.front();
suffix_queue_.pop();
return ret;
}
void ManifestIncrementalIndexer::reset() {
IncrementalIndexer::reset();
suffix_map_.clear();
unverified_segments_.clear();
SuffixQueue empty;
std::swap(suffix_queue_, empty);
suffix_strategy_->reset(first_suffix_);
}
} // namespace protocol
} // namespace transport
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