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Remove header checks out of net_processing

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This moves header size and netmagic checking out of net_processing and
into net.  This check now runs in ReadHeader, so that net can exit early
out of receiving bytes from the peer.  IsValid is now slimmed down, so
it no longer needs a MessageStartChars& parameter.

Additionally this removes the rest of the m_valid_* members from
CNetMessage.
This commit is contained in:
Troy Giorshev
2020-05-26 17:01:57 -04:00
parent 52d4ae46ab
commit deb52711a1
8 changed files with 32 additions and 62 deletions
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20
src/net.cpp
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@@ -605,6 +605,7 @@ bool CNode::ReceiveMsgBytes(const char *pch, unsigned int nBytes, bool& complete
// absorb network data
int handled = m_deserializer->Read(pch, nBytes);
if (handled < 0) {
// Serious header problem, disconnect from the peer.
return false;
}
@@ -616,6 +617,7 @@ bool CNode::ReceiveMsgBytes(const char *pch, unsigned int nBytes, bool& complete
uint32_t out_err_raw_size{0};
Optional<CNetMessage> result{m_deserializer->GetMessage(time, out_err_raw_size)};
if (!result) {
// Message deserialization failed. Drop the message but don't disconnect the peer.
// store the size of the corrupt message
mapRecvBytesPerMsgCmd.find(NET_MESSAGE_COMMAND_OTHER)->second += out_err_raw_size;
continue;
@@ -657,11 +659,19 @@ int V1TransportDeserializer::readHeader(const char *pch, unsigned int nBytes)
hdrbuf >> hdr;
}
catch (const std::exception&) {
LogPrint(BCLog::NET, "HEADER ERROR - UNABLE TO DESERIALIZE, peer=%d\n", m_node_id);
return -1;
}
// Check start string, network magic
if (memcmp(hdr.pchMessageStart, m_chain_params.MessageStart(), CMessageHeader::MESSAGE_START_SIZE) != 0) {
LogPrint(BCLog::NET, "HEADER ERROR - MESSAGESTART (%s, %u bytes), received %s, peer=%d\n", hdr.GetCommand(), hdr.nMessageSize, HexStr(hdr.pchMessageStart), m_node_id);
return -1;
}
// reject messages larger than MAX_SIZE or MAX_PROTOCOL_MESSAGE_LENGTH
if (hdr.nMessageSize > MAX_SIZE || hdr.nMessageSize > MAX_PROTOCOL_MESSAGE_LENGTH) {
LogPrint(BCLog::NET, "HEADER ERROR - SIZE (%s, %u bytes), peer=%d\n", hdr.GetCommand(), hdr.nMessageSize, m_node_id);
return -1;
}
@@ -701,10 +711,6 @@ Optional<CNetMessage> V1TransportDeserializer::GetMessage(const std::chrono::mic
// decompose a single CNetMessage from the TransportDeserializer
Optional<CNetMessage> msg(std::move(vRecv));
// store state about valid header, netmagic and checksum
msg->m_valid_header = hdr.IsValid(m_chain_params.MessageStart());
msg->m_valid_netmagic = (memcmp(hdr.pchMessageStart, m_chain_params.MessageStart(), CMessageHeader::MESSAGE_START_SIZE) == 0);
// store command string, time, and sizes
msg->m_command = hdr.GetCommand();
msg->m_time = time;
@@ -716,6 +722,7 @@ Optional<CNetMessage> V1TransportDeserializer::GetMessage(const std::chrono::mic
// We just received a message off the wire, harvest entropy from the time (and the message checksum)
RandAddEvent(ReadLE32(hash.begin()));
// Check checksum and header command string
if (memcmp(hash.begin(), hdr.pchChecksum, CMessageHeader::CHECKSUM_SIZE) != 0) {
LogPrint(BCLog::NET, "CHECKSUM ERROR (%s, %u bytes), expected %s was %s, peer=%d\n",
SanitizeString(msg->m_command), msg->m_message_size,
@@ -724,6 +731,11 @@ Optional<CNetMessage> V1TransportDeserializer::GetMessage(const std::chrono::mic
m_node_id);
out_err_raw_size = msg->m_raw_message_size;
msg = nullopt;
} else if (!hdr.IsCommandValid()) {
LogPrint(BCLog::NET, "HEADER ERROR - COMMAND (%s, %u bytes), peer=%d\n",
hdr.GetCommand(), msg->m_message_size, m_node_id);
out_err_raw_size = msg->m_raw_message_size;
msg = nullopt;
}
// Always reset the network deserializer (prepare for the next message)