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// Copyright (c) 2019-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <chainparams.h>
#include <hash.h>
#include <net.h>
#include <netmessagemaker.h>
#include <protocol.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <util/chaintype.h>
#include <cassert>
#include <cstdint>
#include <limits>
#include <optional>
#include <vector>
void initialize_p2p_transport_serialization()
{
SelectParams(ChainType::REGTEST);
}
FUZZ_TARGET_INIT(p2p_transport_serialization, initialize_p2p_transport_serialization)
{
// Construct deserializer, with a dummy NodeId
V1TransportDeserializer deserializer{Params(), NodeId{0}, SER_NETWORK, INIT_PROTO_VERSION};
V1TransportSerializer serializer{};
FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
auto checksum_assist = fuzzed_data_provider.ConsumeBool();
auto magic_bytes_assist = fuzzed_data_provider.ConsumeBool();
std::vector<uint8_t> mutable_msg_bytes;
auto header_bytes_remaining = CMessageHeader::HEADER_SIZE;
if (magic_bytes_assist) {
auto msg_start = Params().MessageStart();
for (size_t i = 0; i < CMessageHeader::MESSAGE_SIZE_SIZE; ++i) {
mutable_msg_bytes.push_back(msg_start[i]);
}
header_bytes_remaining -= CMessageHeader::MESSAGE_SIZE_SIZE;
}
if (checksum_assist) {
header_bytes_remaining -= CMessageHeader::CHECKSUM_SIZE;
}
auto header_random_bytes = fuzzed_data_provider.ConsumeBytes<uint8_t>(header_bytes_remaining);
mutable_msg_bytes.insert(mutable_msg_bytes.end(), header_random_bytes.begin(), header_random_bytes.end());
auto payload_bytes = fuzzed_data_provider.ConsumeRemainingBytes<uint8_t>();
if (checksum_assist && mutable_msg_bytes.size() == CMessageHeader::CHECKSUM_OFFSET) {
CHash256 hasher;
unsigned char hsh[32];
hasher.Write(payload_bytes);
hasher.Finalize(hsh);
for (size_t i = 0; i < CMessageHeader::CHECKSUM_SIZE; ++i) {
mutable_msg_bytes.push_back(hsh[i]);
}
}
mutable_msg_bytes.insert(mutable_msg_bytes.end(), payload_bytes.begin(), payload_bytes.end());
Span<const uint8_t> msg_bytes{mutable_msg_bytes};
while (msg_bytes.size() > 0) {
const int handled = deserializer.Read(msg_bytes);
if (handled < 0) {
break;
}
if (deserializer.Complete()) {
const std::chrono::microseconds m_time{std::numeric_limits<int64_t>::max()};
bool reject_message{false};
CNetMessage msg = deserializer.GetMessage(m_time, reject_message);
assert(msg.m_type.size() <= CMessageHeader::COMMAND_SIZE);
assert(msg.m_raw_message_size <= mutable_msg_bytes.size());
assert(msg.m_raw_message_size == CMessageHeader::HEADER_SIZE + msg.m_message_size);
assert(msg.m_time == m_time);
std::vector<unsigned char> header;
auto msg2 = CNetMsgMaker{msg.m_recv.GetVersion()}.Make(msg.m_type, Span{msg.m_recv});
serializer.prepareForTransport(msg2, header);
}
}
}
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