RakNet

一个facebook开源的网络游戏框架，有些游戏在用。

然后走Send_Windows_Linux_360NoVDP调用windows sendto 第一个数据包长度为4，数据为0

正常发送数据的话，数据包先进队列。

void RakPeer::SendBuffered( const char *data, BitSize_t numberOfBitsToSend, PacketPriority priority, PacketReliability reliability, char orderingChannel, const AddressOrGUID systemIdentifier, bool broadcast, RemoteSystemStruct::ConnectMode connectionMode, uint32_t receipt )
{
	BufferedCommandStruct *bcs;
    // 这地方Allocate用的是内存池
	bcs=bufferedCommands.Allocate( _FILE_AND_LINE_ );
    // 但是这地方每次发送都分配一次？
	bcs->data = (char*) rakMalloc_Ex( (size_t) BITS_TO_BYTES(numberOfBitsToSend), _FILE_AND_LINE_ ); // Making a copy doesn't lose efficiency because I tell the reliability layer to use this allocation for its own copy
	if (bcs->data==0)
	{
		notifyOutOfMemory(_FILE_AND_LINE_);
		bufferedCommands.Deallocate(bcs, _FILE_AND_LINE_);
		return;
	}
	
	RakAssert( !( reliability >= NUMBER_OF_RELIABILITIES || reliability < 0 ) );
	RakAssert( !( priority > NUMBER_OF_PRIORITIES || priority < 0 ) );
	RakAssert( !( orderingChannel >= NUMBER_OF_ORDERED_STREAMS ) );

	memcpy(bcs->data, data, (size_t) BITS_TO_BYTES(numberOfBitsToSend));
	bcs->numberOfBitsToSend=numberOfBitsToSend;
	bcs->priority=priority;
	bcs->reliability=reliability;
	bcs->orderingChannel=orderingChannel;
	bcs->systemIdentifier=systemIdentifier;
	bcs->broadcast=broadcast;
	bcs->connectionMode=connectionMode;
	bcs->receipt=receipt;
	bcs->command=BufferedCommandStruct::BCS_SEND;
	bufferedCommands.Push(bcs);

	if (priority==IMMEDIATE_PRIORITY)
	{
		// Forces pending sends to go out now, rather than waiting to the next update interval
		quitAndDataEvents.SetEvent();
	}
}

UpdateNetworkLoop线程会不断的从数据包队列中取出数据发送 10ms处理一次

RecvFromLoop定义在RakNetSocket2.cpp，f12跳转不到这里。

binding.eventHandler->OnRNS2Recv(recvFromStruct);
...
PushBufferedPacket(recvStruct);
quitAndDataEvents.SetEvent();

WireShark直接支持RakNet协议的解析(但是必须在服务器与客户端握手之前开启捕获，才能识别出RakNet协议)。

wiki上对RakNet协议的介绍。 https://wiki.vg/Raknet_Protocol

84开头的包，前14个字节都跟网络引擎有关，第15个字节开始跟特定消息有关。

粘包

RakPeer继承于RakPeerInterface，接口类内全是纯虚函数