| /* |
| * |
| * Copyright (c) 2020-2021 Project CHIP Authors |
| * Copyright (c) 2013-2017 Nest Labs, Inc. |
| * All rights reserved. |
| * |
| * 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. |
| */ |
| |
| /** |
| * @file |
| * This file implements the CHIP Transport object that maintains TCP connections |
| * to peers. Handles both establishing new connections and accepting peer connection |
| * requests. |
| */ |
| #include <transport/raw/TCP.h> |
| |
| #include <lib/core/CHIPEncoding.h> |
| #include <lib/support/CodeUtils.h> |
| #include <lib/support/logging/CHIPLogging.h> |
| #include <transport/raw/MessageHeader.h> |
| |
| #include <inttypes.h> |
| #include <limits> |
| |
| namespace chip { |
| namespace Transport { |
| namespace { |
| |
| using namespace chip::Encoding; |
| |
| // Packets start with a 32-bit size field. |
| constexpr size_t kPacketSizeBytes = 4; |
| |
| static_assert(System::PacketBuffer::kLargeBufMaxSizeWithoutReserve <= UINT32_MAX, "Cast below could truncate the value"); |
| static_assert(System::PacketBuffer::kLargeBufMaxSizeWithoutReserve >= kPacketSizeBytes, |
| "Large buffer allocation should be large enough to hold the length field"); |
| |
| constexpr uint32_t kMaxTCPMessageSize = |
| static_cast<uint32_t>(System::PacketBuffer::kLargeBufMaxSizeWithoutReserve - kPacketSizeBytes); |
| |
| constexpr int kListenBacklogSize = 2; |
| |
| } // namespace |
| |
| TCPBase::~TCPBase() |
| { |
| if (mListenSocket != nullptr) |
| { |
| // endpoint is only non null if it is initialized and listening |
| mListenSocket->Free(); |
| mListenSocket = nullptr; |
| } |
| |
| CloseActiveConnections(); |
| } |
| |
| void TCPBase::CloseActiveConnections() |
| { |
| for (size_t i = 0; i < mActiveConnectionsSize; i++) |
| { |
| if (mActiveConnections[i].InUse()) |
| { |
| CloseConnectionInternal(&mActiveConnections[i], CHIP_NO_ERROR, SuppressCallback::Yes); |
| } |
| } |
| } |
| |
| CHIP_ERROR TCPBase::Init(TcpListenParameters & params) |
| { |
| CHIP_ERROR err = CHIP_NO_ERROR; |
| |
| VerifyOrExit(mState == TCPState::kNotReady, err = CHIP_ERROR_INCORRECT_STATE); |
| |
| #if INET_CONFIG_ENABLE_TCP_ENDPOINT |
| err = params.GetEndPointManager()->NewEndPoint(&mListenSocket); |
| #else |
| err = CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE; |
| #endif |
| SuccessOrExit(err); |
| |
| err = mListenSocket->Bind(params.GetAddressType(), Inet::IPAddress::Any, params.GetListenPort(), |
| params.GetInterfaceId().IsPresent()); |
| SuccessOrExit(err); |
| |
| mListenSocket->mAppState = reinterpret_cast<void *>(this); |
| mListenSocket->OnConnectionReceived = HandleIncomingConnection; |
| mListenSocket->OnAcceptError = HandleAcceptError; |
| |
| mEndpointType = params.GetAddressType(); |
| |
| err = mListenSocket->Listen(kListenBacklogSize); |
| SuccessOrExit(err); |
| |
| mState = TCPState::kInitialized; |
| |
| exit: |
| if (err != CHIP_NO_ERROR) |
| { |
| ChipLogError(Inet, "Failed to initialize TCP transport: %" CHIP_ERROR_FORMAT, err.Format()); |
| if (mListenSocket) |
| { |
| mListenSocket->Free(); |
| mListenSocket = nullptr; |
| } |
| } |
| |
| return err; |
| } |
| |
| void TCPBase::Close() |
| { |
| if (mListenSocket) |
| { |
| mListenSocket->Free(); |
| mListenSocket = nullptr; |
| } |
| mState = TCPState::kNotReady; |
| } |
| |
| ActiveTCPConnectionState * TCPBase::AllocateConnection() |
| { |
| for (size_t i = 0; i < mActiveConnectionsSize; i++) |
| { |
| if (!mActiveConnections[i].InUse()) |
| { |
| return &mActiveConnections[i]; |
| } |
| } |
| |
| return nullptr; |
| } |
| |
| // Find an ActiveTCPConnectionState corresponding to a peer address |
| ActiveTCPConnectionState * TCPBase::FindActiveConnection(const PeerAddress & address) |
| { |
| if (address.GetTransportType() != Type::kTcp) |
| { |
| return nullptr; |
| } |
| |
| for (size_t i = 0; i < mActiveConnectionsSize; i++) |
| { |
| if (!mActiveConnections[i].IsConnected()) |
| { |
| continue; |
| } |
| Inet::IPAddress addr; |
| uint16_t port; |
| mActiveConnections[i].mEndPoint->GetPeerInfo(&addr, &port); |
| |
| if ((addr == address.GetIPAddress()) && (port == address.GetPort())) |
| { |
| return &mActiveConnections[i]; |
| } |
| } |
| |
| return nullptr; |
| } |
| |
| // Find the ActiveTCPConnectionState for a given TCPEndPoint |
| ActiveTCPConnectionState * TCPBase::FindActiveConnection(const Inet::TCPEndPoint * endPoint) |
| { |
| for (size_t i = 0; i < mActiveConnectionsSize; i++) |
| { |
| if (mActiveConnections[i].mEndPoint == endPoint && mActiveConnections[i].IsConnected()) |
| { |
| return &mActiveConnections[i]; |
| } |
| } |
| return nullptr; |
| } |
| |
| ActiveTCPConnectionState * TCPBase::FindInUseConnection(const Inet::TCPEndPoint * endPoint) |
| { |
| if (endPoint == nullptr) |
| { |
| return nullptr; |
| } |
| |
| for (size_t i = 0; i < mActiveConnectionsSize; i++) |
| { |
| if (mActiveConnections[i].mEndPoint == endPoint) |
| { |
| return &mActiveConnections[i]; |
| } |
| } |
| return nullptr; |
| } |
| |
| CHIP_ERROR TCPBase::SendMessage(const Transport::PeerAddress & address, System::PacketBufferHandle && msgBuf) |
| { |
| // Sent buffer data format is: |
| // - packet size as a uint32_t |
| // - actual data |
| |
| VerifyOrReturnError(address.GetTransportType() == Type::kTcp, CHIP_ERROR_INVALID_ARGUMENT); |
| VerifyOrReturnError(mState == TCPState::kInitialized, CHIP_ERROR_INCORRECT_STATE); |
| VerifyOrReturnError(kPacketSizeBytes + msgBuf->DataLength() <= System::PacketBuffer::kLargeBufMaxSizeWithoutReserve, |
| CHIP_ERROR_INVALID_ARGUMENT); |
| |
| static_assert(kPacketSizeBytes <= UINT16_MAX); |
| VerifyOrReturnError(msgBuf->EnsureReservedSize(static_cast<uint16_t>(kPacketSizeBytes)), CHIP_ERROR_NO_MEMORY); |
| |
| msgBuf->SetStart(msgBuf->Start() - kPacketSizeBytes); |
| |
| uint8_t * output = msgBuf->Start(); |
| LittleEndian::Write32(output, static_cast<uint32_t>(msgBuf->DataLength() - kPacketSizeBytes)); |
| |
| // Reuse existing connection if one exists, otherwise a new one |
| // will be established |
| ActiveTCPConnectionState * connection = FindActiveConnection(address); |
| |
| if (connection != nullptr) |
| { |
| return connection->mEndPoint->Send(std::move(msgBuf)); |
| } |
| |
| return SendAfterConnect(address, std::move(msgBuf)); |
| } |
| |
| CHIP_ERROR TCPBase::StartConnect(const PeerAddress & addr, Transport::AppTCPConnectionCallbackCtxt * appState, |
| Transport::ActiveTCPConnectionState ** outPeerConnState) |
| { |
| #if INET_CONFIG_ENABLE_TCP_ENDPOINT |
| ActiveTCPConnectionState * activeConnection = nullptr; |
| Inet::TCPEndPoint * endPoint = nullptr; |
| *outPeerConnState = nullptr; |
| ReturnErrorOnFailure(mListenSocket->GetEndPointManager().NewEndPoint(&endPoint)); |
| |
| auto EndPointDeletor = [](Inet::TCPEndPoint * e) { e->Free(); }; |
| std::unique_ptr<Inet::TCPEndPoint, decltype(EndPointDeletor)> endPointHolder(endPoint, EndPointDeletor); |
| |
| endPoint->mAppState = reinterpret_cast<void *>(this); |
| endPoint->OnConnectComplete = HandleTCPEndPointConnectComplete; |
| endPoint->SetConnectTimeout(mConnectTimeout); |
| |
| activeConnection = AllocateConnection(); |
| VerifyOrReturnError(activeConnection != nullptr, CHIP_ERROR_NO_MEMORY); |
| activeConnection->Init(endPoint, addr); |
| activeConnection->mAppState = appState; |
| activeConnection->mConnectionState = TCPState::kConnecting; |
| // Set the return value of the peer connection state to the allocated |
| // connection. |
| *outPeerConnState = activeConnection; |
| |
| ReturnErrorOnFailure(endPoint->Connect(addr.GetIPAddress(), addr.GetPort(), addr.GetInterface())); |
| |
| mUsedEndPointCount++; |
| |
| endPointHolder.release(); |
| |
| return CHIP_NO_ERROR; |
| #else |
| return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE; |
| #endif |
| } |
| |
| CHIP_ERROR TCPBase::SendAfterConnect(const PeerAddress & addr, System::PacketBufferHandle && msg) |
| { |
| #if INET_CONFIG_ENABLE_TCP_ENDPOINT |
| // This will initiate a connection to the specified peer |
| bool alreadyConnecting = false; |
| |
| // Iterate through the ENTIRE array. If a pending packet for |
| // the address already exists, this means a connection is pending and |
| // does NOT need to be re-established. |
| mPendingPackets.ForEachActiveObject([&](PendingPacket * pending) { |
| if (pending->mPeerAddress == addr) |
| { |
| // same destination exists. |
| alreadyConnecting = true; |
| pending->mPacketBuffer->AddToEnd(std::move(msg)); |
| return Loop::Break; |
| } |
| return Loop::Continue; |
| }); |
| |
| // If already connecting, buffer was just enqueued for more sending |
| if (alreadyConnecting) |
| { |
| return CHIP_NO_ERROR; |
| } |
| |
| // Ensures sufficient active connections size exist |
| VerifyOrReturnError(mUsedEndPointCount < mActiveConnectionsSize, CHIP_ERROR_NO_MEMORY); |
| |
| Transport::ActiveTCPConnectionState * peerConnState = nullptr; |
| ReturnErrorOnFailure(StartConnect(addr, nullptr, &peerConnState)); |
| |
| // enqueue the packet once the connection succeeds |
| VerifyOrReturnError(mPendingPackets.CreateObject(addr, std::move(msg)) != nullptr, CHIP_ERROR_NO_MEMORY); |
| mUsedEndPointCount++; |
| |
| return CHIP_NO_ERROR; |
| #else |
| return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE; |
| #endif |
| } |
| |
| CHIP_ERROR TCPBase::ProcessReceivedBuffer(Inet::TCPEndPoint * endPoint, const PeerAddress & peerAddress, |
| System::PacketBufferHandle && buffer) |
| { |
| ActiveTCPConnectionState * state = FindActiveConnection(endPoint); |
| VerifyOrReturnError(state != nullptr, CHIP_ERROR_INTERNAL); |
| state->mReceived.AddToEnd(std::move(buffer)); |
| |
| while (!state->mReceived.IsNull()) |
| { |
| uint8_t messageSizeBuf[kPacketSizeBytes]; |
| CHIP_ERROR err = state->mReceived->Read(messageSizeBuf); |
| if (err == CHIP_ERROR_BUFFER_TOO_SMALL) |
| { |
| // We don't have enough data to read the message size. Wait until there's more. |
| return CHIP_NO_ERROR; |
| } |
| if (err != CHIP_NO_ERROR) |
| { |
| return err; |
| } |
| uint32_t messageSize = LittleEndian::Get32(messageSizeBuf); |
| if (messageSize >= kMaxTCPMessageSize) |
| { |
| // Message is too big for this node to process. Disconnect from peer. |
| ChipLogError(Inet, "Received TCP message of length %" PRIu32 " exceeds limit.", messageSize); |
| CloseConnectionInternal(state, CHIP_ERROR_MESSAGE_TOO_LONG, SuppressCallback::No); |
| |
| return CHIP_ERROR_MESSAGE_TOO_LONG; |
| } |
| // The subtraction will not underflow because we successfully read kPacketSizeBytes. |
| if (messageSize > (state->mReceived->TotalLength() - kPacketSizeBytes)) |
| { |
| // We have not yet received the complete message. |
| return CHIP_NO_ERROR; |
| } |
| state->mReceived.Consume(kPacketSizeBytes); |
| ReturnErrorOnFailure(ProcessSingleMessage(peerAddress, state, messageSize)); |
| } |
| |
| return CHIP_NO_ERROR; |
| } |
| |
| CHIP_ERROR TCPBase::ProcessSingleMessage(const PeerAddress & peerAddress, ActiveTCPConnectionState * state, size_t messageSize) |
| { |
| // We enter with `state->mReceived` containing at least one full message, perhaps in a chain. |
| // `state->mReceived->Start()` currently points to the message data. |
| // On exit, `state->mReceived` will have had `messageSize` bytes consumed, no matter what. |
| System::PacketBufferHandle message; |
| MessageTransportContext msgContext; |
| msgContext.conn = state; |
| |
| if (state->mReceived->DataLength() == messageSize) |
| { |
| // In this case, the head packet buffer contains exactly the message. |
| // This is common because typical messages fit in a network packet, and are delivered as such. |
| // Peel off the head to pass upstream, which effectively consumes it from `state->mReceived`. |
| message = state->mReceived.PopHead(); |
| } |
| else |
| { |
| // The message is either longer or shorter than the head buffer. |
| // In either case, copy the message to a fresh linear buffer to pass upstream. We always copy, rather than provide |
| // a shared reference to the current buffer, in case upper layers manipulate the buffer in ways that would affect |
| // our use, e.g. chaining it elsewhere or reusing space beyond the current message. |
| message = System::PacketBufferHandle::New(messageSize, 0); |
| if (message.IsNull()) |
| { |
| return CHIP_ERROR_NO_MEMORY; |
| } |
| CHIP_ERROR err = state->mReceived->Read(message->Start(), messageSize); |
| state->mReceived.Consume(messageSize); |
| ReturnErrorOnFailure(err); |
| message->SetDataLength(messageSize); |
| } |
| |
| HandleMessageReceived(peerAddress, std::move(message), &msgContext); |
| return CHIP_NO_ERROR; |
| } |
| |
| void TCPBase::CloseConnectionInternal(ActiveTCPConnectionState * connection, CHIP_ERROR err, SuppressCallback suppressCallback) |
| { |
| TCPState prevState; |
| |
| if (connection == nullptr) |
| { |
| return; |
| } |
| |
| if (connection->mConnectionState != TCPState::kClosed && connection->mEndPoint) |
| { |
| char addrStr[Transport::PeerAddress::kMaxToStringSize]; |
| connection->mPeerAddr.ToString(addrStr); |
| ChipLogProgress(Inet, "Closing connection with peer %s.", addrStr); |
| |
| if (err == CHIP_NO_ERROR) |
| { |
| connection->mEndPoint->Close(); |
| } |
| else |
| { |
| connection->mEndPoint->Abort(); |
| } |
| |
| prevState = connection->mConnectionState; |
| connection->mConnectionState = TCPState::kClosed; |
| |
| if (suppressCallback == SuppressCallback::No) |
| { |
| if (prevState == TCPState::kConnecting) |
| { |
| // Call upper layer connection attempt complete handler |
| HandleConnectionAttemptComplete(connection, err); |
| } |
| else |
| { |
| // Call upper layer connection closed handler |
| HandleConnectionClosed(connection, err); |
| } |
| } |
| |
| connection->Free(); |
| mUsedEndPointCount--; |
| } |
| } |
| |
| CHIP_ERROR TCPBase::HandleTCPEndPointDataReceived(Inet::TCPEndPoint * endPoint, System::PacketBufferHandle && buffer) |
| { |
| Inet::IPAddress ipAddress; |
| uint16_t port; |
| Inet::InterfaceId interfaceId; |
| |
| endPoint->GetPeerInfo(&ipAddress, &port); |
| endPoint->GetInterfaceId(&interfaceId); |
| PeerAddress peerAddress = PeerAddress::TCP(ipAddress, port, interfaceId); |
| |
| TCPBase * tcp = reinterpret_cast<TCPBase *>(endPoint->mAppState); |
| CHIP_ERROR err = tcp->ProcessReceivedBuffer(endPoint, peerAddress, std::move(buffer)); |
| |
| if (err != CHIP_NO_ERROR) |
| { |
| // Connection could need to be closed at this point |
| ChipLogError(Inet, "Failed to accept received TCP message: %" CHIP_ERROR_FORMAT, err.Format()); |
| return CHIP_ERROR_UNEXPECTED_EVENT; |
| } |
| return CHIP_NO_ERROR; |
| } |
| |
| void TCPBase::HandleTCPEndPointConnectComplete(Inet::TCPEndPoint * endPoint, CHIP_ERROR conErr) |
| { |
| CHIP_ERROR err = CHIP_NO_ERROR; |
| bool foundPendingPacket = false; |
| TCPBase * tcp = reinterpret_cast<TCPBase *>(endPoint->mAppState); |
| Inet::IPAddress ipAddress; |
| uint16_t port; |
| Inet::InterfaceId interfaceId; |
| ActiveTCPConnectionState * activeConnection = nullptr; |
| |
| endPoint->GetPeerInfo(&ipAddress, &port); |
| endPoint->GetInterfaceId(&interfaceId); |
| char addrStr[Transport::PeerAddress::kMaxToStringSize]; |
| PeerAddress addr = PeerAddress::TCP(ipAddress, port, interfaceId); |
| addr.ToString(addrStr); |
| |
| if (conErr == CHIP_NO_ERROR) |
| { |
| // Set the Data received handler when connection completes |
| endPoint->OnDataReceived = HandleTCPEndPointDataReceived; |
| endPoint->OnDataSent = nullptr; |
| endPoint->OnConnectionClosed = HandleTCPEndPointConnectionClosed; |
| |
| activeConnection = tcp->FindInUseConnection(endPoint); |
| VerifyOrDie(activeConnection != nullptr); |
| |
| // Set to Connected state |
| activeConnection->mConnectionState = TCPState::kConnected; |
| |
| // Disable TCP Nagle buffering by setting TCP_NODELAY socket option to true. |
| // This is to expedite transmission of payload data and not rely on the |
| // network stack's configuration of collating enough data in the TCP |
| // window to begin transmission. |
| err = endPoint->EnableNoDelay(); |
| if (err != CHIP_NO_ERROR) |
| { |
| tcp->CloseConnectionInternal(activeConnection, err, SuppressCallback::No); |
| return; |
| } |
| |
| // Send any pending packets that are queued for this connection |
| tcp->mPendingPackets.ForEachActiveObject([&](PendingPacket * pending) { |
| if (pending->mPeerAddress == addr) |
| { |
| foundPendingPacket = true; |
| System::PacketBufferHandle buffer = std::move(pending->mPacketBuffer); |
| tcp->mPendingPackets.ReleaseObject(pending); |
| |
| if ((conErr == CHIP_NO_ERROR) && (err == CHIP_NO_ERROR)) |
| { |
| err = endPoint->Send(std::move(buffer)); |
| } |
| } |
| return Loop::Continue; |
| }); |
| |
| // Set the TCPKeepalive configurations on the established connection |
| endPoint->EnableKeepAlive(activeConnection->mTCPKeepAliveIntervalSecs, activeConnection->mTCPMaxNumKeepAliveProbes); |
| |
| ChipLogProgress(Inet, "Connection established successfully with %s.", addrStr); |
| |
| // Let higher layer/delegate know that connection is successfully |
| // established |
| tcp->HandleConnectionAttemptComplete(activeConnection, CHIP_NO_ERROR); |
| } |
| else |
| { |
| ChipLogError(Inet, "Connection establishment with %s encountered an error: %" CHIP_ERROR_FORMAT, addrStr, err.Format()); |
| endPoint->Free(); |
| tcp->mUsedEndPointCount--; |
| } |
| } |
| |
| void TCPBase::HandleTCPEndPointConnectionClosed(Inet::TCPEndPoint * endPoint, CHIP_ERROR err) |
| { |
| TCPBase * tcp = reinterpret_cast<TCPBase *>(endPoint->mAppState); |
| ActiveTCPConnectionState * activeConnection = tcp->FindInUseConnection(endPoint); |
| |
| if (activeConnection == nullptr) |
| { |
| endPoint->Free(); |
| return; |
| } |
| |
| if (err == CHIP_NO_ERROR && activeConnection->IsConnected()) |
| { |
| err = CHIP_ERROR_CONNECTION_CLOSED_UNEXPECTEDLY; |
| } |
| |
| tcp->CloseConnectionInternal(activeConnection, err, SuppressCallback::No); |
| } |
| |
| // Handler for incoming connection requests from peer nodes |
| void TCPBase::HandleIncomingConnection(Inet::TCPEndPoint * listenEndPoint, Inet::TCPEndPoint * endPoint, |
| const Inet::IPAddress & peerAddress, uint16_t peerPort) |
| { |
| TCPBase * tcp = reinterpret_cast<TCPBase *>(listenEndPoint->mAppState); |
| ActiveTCPConnectionState * activeConnection = nullptr; |
| Inet::InterfaceId interfaceId; |
| Inet::IPAddress ipAddress; |
| uint16_t port; |
| |
| endPoint->GetPeerInfo(&ipAddress, &port); |
| endPoint->GetInterfaceId(&interfaceId); |
| PeerAddress addr = PeerAddress::TCP(ipAddress, port, interfaceId); |
| |
| if (tcp->mUsedEndPointCount < tcp->mActiveConnectionsSize) |
| { |
| activeConnection = tcp->AllocateConnection(); |
| |
| endPoint->mAppState = listenEndPoint->mAppState; |
| endPoint->OnDataReceived = HandleTCPEndPointDataReceived; |
| endPoint->OnDataSent = nullptr; |
| endPoint->OnConnectionClosed = HandleTCPEndPointConnectionClosed; |
| |
| // By default, disable TCP Nagle buffering by setting TCP_NODELAY socket option to true |
| endPoint->EnableNoDelay(); |
| |
| // Update state for the active connection |
| activeConnection->Init(endPoint, addr); |
| tcp->mUsedEndPointCount++; |
| activeConnection->mConnectionState = TCPState::kConnected; |
| |
| // Set the TCPKeepalive configurations on the received connection |
| endPoint->EnableKeepAlive(activeConnection->mTCPKeepAliveIntervalSecs, activeConnection->mTCPMaxNumKeepAliveProbes); |
| |
| char addrStr[Transport::PeerAddress::kMaxToStringSize]; |
| peerAddress.ToString(addrStr); |
| ChipLogProgress(Inet, "Incoming connection established with peer at %s.", addrStr); |
| |
| // Call the upper layer handler for incoming connection received. |
| tcp->HandleConnectionReceived(activeConnection); |
| } |
| else |
| { |
| ChipLogError(Inet, "Insufficient connection space to accept new connections."); |
| endPoint->Free(); |
| listenEndPoint->OnAcceptError(endPoint, CHIP_ERROR_TOO_MANY_CONNECTIONS); |
| } |
| } |
| |
| void TCPBase::HandleAcceptError(Inet::TCPEndPoint * endPoint, CHIP_ERROR err) |
| { |
| endPoint->Free(); |
| ChipLogError(Inet, "Accept error: %" CHIP_ERROR_FORMAT, err.Format()); |
| } |
| |
| CHIP_ERROR TCPBase::TCPConnect(const PeerAddress & address, Transport::AppTCPConnectionCallbackCtxt * appState, |
| Transport::ActiveTCPConnectionState ** outPeerConnState) |
| { |
| VerifyOrReturnError(mState == TCPState::kInitialized, CHIP_ERROR_INCORRECT_STATE); |
| |
| // Verify that PeerAddress AddressType is TCP |
| VerifyOrReturnError(address.GetTransportType() == Transport::Type::kTcp, CHIP_ERROR_INVALID_ARGUMENT); |
| |
| VerifyOrReturnError(mUsedEndPointCount < mActiveConnectionsSize, CHIP_ERROR_NO_MEMORY); |
| |
| char addrStr[Transport::PeerAddress::kMaxToStringSize]; |
| address.ToString(addrStr); |
| ChipLogProgress(Inet, "Connecting to peer %s.", addrStr); |
| |
| ReturnErrorOnFailure(StartConnect(address, appState, outPeerConnState)); |
| |
| return CHIP_NO_ERROR; |
| } |
| |
| void TCPBase::TCPDisconnect(const PeerAddress & address) |
| { |
| // Closes an existing connection |
| for (size_t i = 0; i < mActiveConnectionsSize; i++) |
| { |
| if (mActiveConnections[i].IsConnected()) |
| { |
| const Inet::IPAddress & ipAddress = mActiveConnections[i].mPeerAddr.GetIPAddress(); |
| uint16_t port = mActiveConnections[i].mPeerAddr.GetPort(); |
| |
| // Ignoring the InterfaceID in the check as it may not have been provided in |
| // the PeerAddress during connection establishment. The IPAddress and Port |
| // are the necessary and sufficient set of parameters for searching |
| // through the connections. |
| if (ipAddress == address.GetIPAddress() && port == address.GetPort() && address.GetTransportType() == Type::kTcp) |
| { |
| // NOTE: this leaves the socket in TIME_WAIT. |
| // Calling Abort() would clean it since SO_LINGER would be set to 0, |
| // however this seems not to be useful. |
| CloseConnectionInternal(&mActiveConnections[i], CHIP_NO_ERROR, SuppressCallback::Yes); |
| } |
| } |
| } |
| } |
| |
| void TCPBase::TCPDisconnect(Transport::ActiveTCPConnectionState * conn, bool shouldAbort) |
| { |
| |
| if (conn == nullptr) |
| { |
| ChipLogError(Inet, "Failed to Disconnect. Passed in Connection is null."); |
| return; |
| } |
| |
| // This call should be able to disconnect the connection either when it is |
| // already established, or when it is being set up. |
| if ((conn->IsConnected() && shouldAbort) || conn->IsConnecting()) |
| { |
| CloseConnectionInternal(conn, CHIP_ERROR_CONNECTION_ABORTED, SuppressCallback::Yes); |
| } |
| |
| if (conn->IsConnected() && !shouldAbort) |
| { |
| CloseConnectionInternal(conn, CHIP_NO_ERROR, SuppressCallback::Yes); |
| } |
| } |
| |
| bool TCPBase::HasActiveConnections() const |
| { |
| for (size_t i = 0; i < mActiveConnectionsSize; i++) |
| { |
| if (mActiveConnections[i].IsConnected()) |
| { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| } // namespace Transport |
| } // namespace chip |
