void C4Network2ClientList::HandlePacket(char cStatus,
const C4PacketBase *pBasePkt,
C4Network2IOConnection *pConn) {
// find associated client
C4Network2Client *pClient = GetClient(pConn);
if (!pClient) return;
#define GETPKT(type, name) \
assert(pBasePkt); \
const type &name = /*dynamic_cast*/ static_cast<const type &>(*pBasePkt);
switch (cStatus) {
case PID_Addr: // address propagation
{
GETPKT(C4PacketAddr, rPkt)
// find client
pClient = GetClientByID(rPkt.getClientID());
if (pClient) {
C4Network2Address addr = rPkt.getAddr();
// IP zero? Set to IP from where the packet came
if (addr.isIPNull()) addr.SetIP(pConn->getPeerAddr().sin_addr);
// add (no announce)
if (pClient->AddAddr(addr, true))
// new address? Try to connect
pClient->DoConnectAttempt(pIO);
}
} break;
}
#undef GETPKT
}
bool C4Network2Client::DoTCPSimultaneousOpen(class C4Network2IO *pIO, const C4Network2Address &addr)
{
if (!pIO->getNetIO(P_TCP)) return false;
// Did we already bind a socket?
if (TcpSimOpenSocket)
{
LogSilentF("Network: connecting client %s on %s with TCP simultaneous open...", getName(), addr.getAddr().ToString().getData());
return pIO->ConnectWithSocket(addr.getAddr(), addr.getProtocol(), pClient->getCore(), std::move(TcpSimOpenSocket));
}
else
{
// No - bind one, inform peer, and schedule a connection attempt.
auto NetIOTCP = dynamic_cast<C4NetIOTCP*>(pIO->getNetIO(P_TCP));
auto bindAddr = pParent->GetLocal()->IPv6AddrFromPuncher;
// We need to know an address that works.
if (bindAddr.IsNull()) return false;
bindAddr.SetPort(0);
TcpSimOpenSocket = NetIOTCP->Bind(bindAddr);
auto boundAddr = TcpSimOpenSocket->GetAddress();
LogSilentF("Network: %s TCP simultaneous open request for client %s from %s...", addr.isIPNull() ? "initiating" : "responding to",
getName(), boundAddr.ToString().getData());
// Send address we bound to to the client.
if (!SendMsg(MkC4NetIOPacket(PID_TCPSimOpen, C4PacketTCPSimOpen(pParent->GetLocal()->getID(), C4Network2Address(boundAddr, P_TCP)))))
return false;
if (!addr.isIPNull())
{
// We need to delay the connection attempt a bit. Unfortunately,
// waiting for the next tick would usually take way too much time.
// Instead, we block the main thread for a very short time and hope
// that noone notices...
int ping = getMsgConn()->getLag();
std::this_thread::sleep_for(std::chrono::milliseconds(std::min(ping / 2, 10)));
DoTCPSimultaneousOpen(pIO, addr);
}
return true;
}
}