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authorTiger Wang <ziwei.tiger@outlook.com>2021-07-10 22:04:49 +0200
committerGitHub <noreply@github.com>2021-07-10 22:04:49 +0200
commite9265b1d0129e56b9b665019697055bd63229fde (patch)
tree611a2026e0e9ca9bb1de62170d79b9906d112e6f /src/Protocol/ProtocolRecognizer.cpp
parentItem frame maps (#5258) (diff)
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Diffstat (limited to 'src/Protocol/ProtocolRecognizer.cpp')
-rw-r--r--src/Protocol/ProtocolRecognizer.cpp73
1 files changed, 50 insertions, 23 deletions
diff --git a/src/Protocol/ProtocolRecognizer.cpp b/src/Protocol/ProtocolRecognizer.cpp
index 181998337..ba179c1bf 100644
--- a/src/Protocol/ProtocolRecognizer.cpp
+++ b/src/Protocol/ProtocolRecognizer.cpp
@@ -38,8 +38,8 @@ struct TriedToJoinWithUnsupportedProtocolException : public std::runtime_error
cMultiVersionProtocol::cMultiVersionProtocol() :
- HandleIncomingData(std::bind(&cMultiVersionProtocol::HandleIncomingDataInRecognitionStage, this, std::placeholders::_1, std::placeholders::_2)),
- m_Buffer(32 KiB)
+ m_Buffer(32 KiB),
+ m_WaitingForData(true)
{
}
@@ -76,7 +76,7 @@ AString cMultiVersionProtocol::GetVersionTextFromInt(cProtocol::Version a_Protoc
-void cMultiVersionProtocol::HandleIncomingDataInRecognitionStage(cClientHandle & a_Client, ContiguousByteBuffer && a_Data)
+void cMultiVersionProtocol::HandleIncomingDataInRecognitionStage(cClientHandle & a_Client, ContiguousByteBuffer & a_Data)
{
// NOTE: If a new protocol is added or an old one is removed, adjust MCS_CLIENT_VERSIONS and MCS_PROTOCOL_VERSIONS macros in the header file
@@ -115,26 +115,14 @@ void cMultiVersionProtocol::HandleIncomingDataInRecognitionStage(cClientHandle &
3. Exception: the data sent were garbage, the client handle deals with it by disconnecting */
m_Protocol = TryRecognizeLengthedProtocol(a_Client);
- if (m_Protocol == nullptr)
- {
- // Got a server list ping for an unrecognised version,
- // switch into responding to unknown protocols mode:
- HandleIncomingData = [this](cClientHandle & a_Clyent, ContiguousByteBuffer && a_In)
- {
- HandleIncomingDataInOldPingResponseStage(a_Clyent, a_In);
- };
- }
- else
- {
- // The protocol recogniser succesfully identified, switch mode:
- HandleIncomingData = [this](cClientHandle &, ContiguousByteBuffer && a_In)
- {
- m_Protocol->DataReceived(m_Buffer, std::move(a_In));
- };
- }
+ // Version recognised. Cause HandleIncomingData to stop calling us to handle data:
+ m_WaitingForData = false;
// Explicitly process any remaining data (already written to m_Buffer) with the new handler:
- HandleIncomingData(a_Client, {});
+ {
+ ContiguousByteBuffer Empty;
+ HandleIncomingData(a_Client, Empty);
+ }
}
@@ -170,12 +158,10 @@ void cMultiVersionProtocol::HandleIncomingDataInOldPingResponseStage(cClientHand
if ((PacketID == 0x00) && (PacketLen == 1)) // Request packet
{
HandlePacketStatusRequest(a_Client, OutPacketBuffer);
- SendPacket(a_Client, OutPacketBuffer);
}
else if ((PacketID == 0x01) && (PacketLen == 9)) // Ping packet
{
HandlePacketStatusPing(a_Client, OutPacketBuffer);
- SendPacket(a_Client, OutPacketBuffer);
}
else
{
@@ -191,6 +177,43 @@ void cMultiVersionProtocol::HandleIncomingDataInOldPingResponseStage(cClientHand
+void cMultiVersionProtocol::HandleIncomingData(cClientHandle & a_Client, ContiguousByteBuffer & a_Data)
+{
+ if (m_WaitingForData)
+ {
+ HandleIncomingDataInRecognitionStage(a_Client, a_Data);
+ }
+ else if (m_Protocol == nullptr)
+ {
+ // Got a Handshake for an unrecognised version, process future data accordingly:
+ HandleIncomingDataInOldPingResponseStage(a_Client, a_Data);
+ }
+ else
+ {
+ // The protocol recogniser succesfully identified a supported version, direct data to that protocol:
+ m_Protocol->DataReceived(m_Buffer, a_Data);
+ }
+}
+
+
+
+
+
+void cMultiVersionProtocol::HandleOutgoingData(ContiguousByteBuffer & a_Data)
+{
+ // Normally only the protocol sends data, so outgoing data are only present when m_Protocol != nullptr.
+ // However, for unrecognised protocols we send data too, and that's when m_Protocol == nullptr. Check to avoid crashing (GH #5260).
+
+ if (m_Protocol != nullptr)
+ {
+ m_Protocol->DataPrepared(a_Data);
+ }
+}
+
+
+
+
+
void cMultiVersionProtocol::SendDisconnect(cClientHandle & a_Client, const AString & a_Reason)
{
if (m_Protocol != nullptr)
@@ -382,6 +405,8 @@ void cMultiVersionProtocol::HandlePacketStatusRequest(cClientHandle & a_Client,
VERIFY(a_Out.WriteVarInt32(GetPacketID(cProtocol::ePacketType::pktStatusResponse)));
VERIFY(a_Out.WriteVarUTF8String(Response));
+
+ SendPacket(a_Client, a_Out);
}
@@ -398,4 +423,6 @@ void cMultiVersionProtocol::HandlePacketStatusPing(cClientHandle & a_Client, cBy
VERIFY(a_Out.WriteVarInt32(GetPacketID(cProtocol::ePacketType::pktPingResponse)));
VERIFY(a_Out.WriteBEInt64(Timestamp));
+
+ SendPacket(a_Client, a_Out);
}