src/transport/TransportMgrBase.cpp

/*
 *
 *    Copyright (c) 2020-2021 Project CHIP Authors
 *
 *    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
 */

#include <transport/TransportMgrBase.h>

#include <lib/support/CodeUtils.h>
#include <platform/LockTracker.h>
#include <transport/TransportMgr.h>
#include <transport/raw/Base.h>

namespace chip {

CHIP_ERROR TransportMgrBase::SendMessage(const Transport::PeerAddress & address, System::PacketBufferHandle && msgBuf)
{
    return mTransport->SendMessage(address, std::move(msgBuf));
}

#if INET_CONFIG_ENABLE_TCP_ENDPOINT
CHIP_ERROR TransportMgrBase::TCPConnect(const Transport::PeerAddress & address, Transport::AppTCPConnectionCallbackCtxt * appState,
                                        Transport::ActiveTCPConnectionState ** peerConnState)
{
    return mTransport->TCPConnect(address, appState, peerConnState);
}

void TransportMgrBase::TCPDisconnect(const Transport::PeerAddress & address)
{
    mTransport->TCPDisconnect(address);
}

void TransportMgrBase::TCPDisconnect(Transport::ActiveTCPConnectionState * conn, bool shouldAbort)
{
    mTransport->TCPDisconnect(conn, shouldAbort);
}
#endif // INET_CONFIG_ENABLE_TCP_ENDPOINT

CHIP_ERROR TransportMgrBase::Init(Transport::Base * transport)
{
    if (mTransport != nullptr)
    {
        return CHIP_ERROR_INCORRECT_STATE;
    }
    mTransport = transport;
    mTransport->SetDelegate(this);

    ChipLogDetail(Inet, "TransportMgr initialized");
    return CHIP_NO_ERROR;
}

void TransportMgrBase::Close()
{
    mSessionManager = nullptr;
    mTransport      = nullptr;
}

CHIP_ERROR TransportMgrBase::MulticastGroupJoinLeave(const Transport::PeerAddress & address, bool join)
{
    return mTransport->MulticastGroupJoinLeave(address, join);
}

void TransportMgrBase::HandleMessageReceived(const Transport::PeerAddress & peerAddress, System::PacketBufferHandle && msg,
                                             Transport::MessageTransportContext * ctxt)
{
    // This is the first point all incoming messages funnel through.  Ensure
    // that our message receipts are all synchronized correctly.
    assertChipStackLockedByCurrentThread();

    if (msg->HasChainedBuffer())
    {
        // Something in the lower levels messed up.
        char addrBuffer[Transport::PeerAddress::kMaxToStringSize];
        peerAddress.ToString(addrBuffer);
        ChipLogError(Inet, "message from %s dropped due to lower layers not ensuring a single packet buffer.", addrBuffer);
        return;
    }

    if (mSessionManager != nullptr)
    {
        mSessionManager->OnMessageReceived(peerAddress, std::move(msg), ctxt);
    }
    else
    {
        char addrBuffer[Transport::PeerAddress::kMaxToStringSize];
        peerAddress.ToString(addrBuffer);
        ChipLogError(Inet, "message from %s is dropped since no corresponding handler is set in TransportMgr.", addrBuffer);
    }
}

#if INET_CONFIG_ENABLE_TCP_ENDPOINT
void TransportMgrBase::HandleConnectionReceived(Transport::ActiveTCPConnectionState * conn)
{
    if (mSessionManager != nullptr)
    {
        mSessionManager->HandleConnectionReceived(conn);
    }
    else
    {
        Transport::TCPBase * tcp = reinterpret_cast<Transport::TCPBase *>(conn->mEndPoint->mAppState);

        // Close connection here since no upper layer is interested in the
        // connection.
        if (tcp)
        {
            tcp->TCPDisconnect(conn, /* shouldAbort = */ true);
        }
    }
}

void TransportMgrBase::HandleConnectionAttemptComplete(Transport::ActiveTCPConnectionState * conn, CHIP_ERROR conErr)
{
    if (mSessionManager != nullptr)
    {
        mSessionManager->HandleConnectionAttemptComplete(conn, conErr);
    }
    else
    {
        Transport::TCPBase * tcp = reinterpret_cast<Transport::TCPBase *>(conn->mEndPoint->mAppState);

        // Close connection here since no upper layer is interested in the
        // connection.
        if (tcp)
        {
            tcp->TCPDisconnect(conn, /* shouldAbort = */ true);
        }
    }
}

void TransportMgrBase::HandleConnectionClosed(Transport::ActiveTCPConnectionState * conn, CHIP_ERROR conErr)
{
    if (mSessionManager != nullptr)
    {
        mSessionManager->HandleConnectionClosed(conn, conErr);
    }
    else
    {
        Transport::TCPBase * tcp = reinterpret_cast<Transport::TCPBase *>(conn->mEndPoint->mAppState);
        if (tcp)
        {
            tcp->TCPDisconnect(conn, /* shouldAbort = */ true);
        }
    }
}
#endif // INET_CONFIG_ENABLE_TCP_ENDPOINT

} // namespace chip