/* 
 * $Id: ClientUDPSocket.cpp 20479 2010-08-27 10:19:36Z huby $
 * 
 * this file is part of eMule
 * Copyright (C)2002-2006 Merkur ( strEmail.Format("%s@%s", "devteam", "emule-project.net") / http://www.emule-project.net )
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "stdafx.h"
//#include "emule.h"
#include "ClientUDPSocket.h"
#include "Packets.h"
#include "DownloadQueue.h"
#include "Statistics.h"
#include "PartFile.h"
#include "SharedFileList.h"
#include "UploadQueue.h"
#include "UpDownClient.h"
#include "Ed2kUpDownClient.h"
#include "Preferences.h"
#include "OtherFunctions.h"
#include "SafeFile.h"
#include "ClientList.h"
#include "Listensocket.h"
#include <zlib/zlib.h>
#include "kademlia/kademlia/Kademlia.h"
#include "kademlia/kademlia/UDPFirewallTester.h"
#include "kademlia/net/KademliaUDPListener.h"
#include "kademlia/io/IOException.h"
#include "IPFilter.h"
#include "Log.h"
#include "EncryptedDatagramSocket.h"
#include "./kademlia/kademlia/prefs.h"
#include "./kademlia/utils/KadUDPKey.h"
#include "Sockets.h"	// VC-kernel[2006-11-24]:
//#include "NatTraversal/NatBridge.h"	// VC-kernel[2006-11-24]:

#include "FirewallOpener.h" //Added by thilon on 2006.10.18,For FireWall
#include "GlobalVariable.h"
//  added by yunchenn
#include "NatTraversal/NatThread.h"
#include "StatForServer.h"
#include "DynamicPref.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

//extern CNatThread * natthread;
// CClientUDPSocket

CClientUDPSocket::CClientUDPSocket()
{
	m_bWouldBlock = false;
	m_port=0;
//	m_nCreateState = 0;
}

CClientUDPSocket::~CClientUDPSocket()
{
	//  Comment UI
    //theApp.uploadBandwidthThrottler->RemoveFromAllQueues(this); // ZZ:UploadBandWithThrottler (UDP)
	CGlobalVariable::uploadBandwidthThrottler->RemoveFromAllQueues(this); // ZZ:UploadBandWithThrottler (UDP)

    POSITION pos = controlpacket_queue.GetHeadPosition();
	while (pos){
		UDPPack* p = controlpacket_queue.GetNext(pos);
		delete p->packet;
		delete p;
	}

}

void CClientUDPSocket::OnReceive(int nErrorCode)
{
	if(CGlobalVariable::m_app_state != APP_STATE_RUNNING) return;

	if (nErrorCode)
	{
		if (thePrefs.GetVerbose())
			DebugLogError(_T("Error: Client UDP socket, error on receive event: %s"), GetErrorMessage(nErrorCode, 1));
	}

	BYTE buffer[5000];
	SOCKADDR_IN sockAddr = {0};
	int iSockAddrLen = sizeof sockAddr;
	int nRealLen = ReceiveFrom(buffer, sizeof buffer, (SOCKADDR*)&sockAddr, &iSockAddrLen);

	// modified by robert, 2010-080-05
	// 处理出错或连接关闭的情况
	if(nRealLen == SOCKET_ERROR || nRealLen == 0)
		return;

	if(buffer[0]==OP_VC_NAT_HEADER)
	{
		if(CGlobalVariable::natthread)
			CGlobalVariable::natthread->ProcessPacket(buffer+1, nRealLen-1, sockAddr.sin_addr.S_un.S_addr, sockAddr.sin_port);
		return;
	}

	if (!(CGlobalVariable::ipfilter->IsFiltered(sockAddr.sin_addr.S_un.S_addr) || CGlobalVariable::clientlist->IsBannedClient(sockAddr.sin_addr.S_un.S_addr)))
	{
		BYTE* pBuffer;
		uint32 nReceiverVerifyKey;
		uint32 nSenderVerifyKey;
		int nPacketLen = DecryptReceivedClient(buffer, nRealLen, &pBuffer, sockAddr.sin_addr.S_un.S_addr, &nReceiverVerifyKey, &nSenderVerifyKey);
		if (nPacketLen >= 1)
		{
			AFX_MANAGE_STATE(AfxGetStaticModuleState())

			CString strError;
			try
			{
				switch (pBuffer[0])
				{
					case OP_EMULEPROT:
					{
						if (nPacketLen >= 2)
							ProcessPacket(pBuffer+2, nPacketLen-2, pBuffer[1], sockAddr.sin_addr.S_un.S_addr, ntohs(sockAddr.sin_port));
						else
							throw CString(_T("eMule packet too short"));
						break;
					}
					case OP_KADEMLIAPACKEDPROT:
					{
						theStats.AddDownDataOverheadKad(nPacketLen);
						if (nPacketLen >= 2)
						{
							uint32 nNewSize = nPacketLen*10+300;
							BYTE* unpack = NULL;
							uLongf unpackedsize = 0;
							int iZLibResult = 0;
							do {
								delete[] unpack;
								unpack = new BYTE[nNewSize];
								unpackedsize = nNewSize-2;
								iZLibResult = uncompress(unpack+2, &unpackedsize, pBuffer+2, nPacketLen-2);
								nNewSize *= 2; // size for the next try if needed
							} while (iZLibResult == Z_BUF_ERROR && nNewSize < 250000);

							if (iZLibResult == Z_OK)
							{
								unpack[0] = OP_KADEMLIAHEADER;
								unpack[1] = pBuffer[1];
								try
								{
									Kademlia::CKademlia::ProcessPacket(unpack, unpackedsize+2, ntohl(sockAddr.sin_addr.S_un.S_addr), ntohs(sockAddr.sin_port)
										, (Kademlia::CPrefs::GetUDPVerifyKey(sockAddr.sin_addr.S_un.S_addr) == nReceiverVerifyKey)
										, Kademlia::CKadUDPKey(nSenderVerifyKey, CGlobalVariable::GetPublicIP(false)) );
								}
								catch(...)
								{
									delete[] unpack;
									throw;
								}
							}
							else
							{
								delete[] unpack;
								CString strError;
								strError.Format(_T("Failed to uncompress Kad packet: zip error: %d (%hs)"), iZLibResult, zError(iZLibResult));
								throw strError;
							}
							delete[] unpack;
						}
						else
							throw CString(_T("Kad packet (compressed) too short"));
						break;
					}
					case OP_KADEMLIAHEADER:
					{
						theStats.AddDownDataOverheadKad(nPacketLen);
						if (nPacketLen >= 2)
							Kademlia::CKademlia::ProcessPacket(pBuffer, nPacketLen, ntohl(sockAddr.sin_addr.S_un.S_addr), ntohs(sockAddr.sin_port)
							, (Kademlia::CPrefs::GetUDPVerifyKey(sockAddr.sin_addr.S_un.S_addr) == nReceiverVerifyKey)
							, Kademlia::CKadUDPKey(nSenderVerifyKey, CGlobalVariable::GetPublicIP(false)) );
						else
							throw CString(_T("Kad packet too short"));
						break;
					}
					//  added by yunchenn
					case OP_VC_NAT_HEADER:
					{
						/*if(CGlobalVariable::serverconnect->clientid==0)  break;
						// VC-kernel[2006-11-24]:
						if(CGlobalVariable::serverconnect->IsLowID()){*/
							if(CGlobalVariable::natthread)
								CGlobalVariable::natthread->ProcessPacket(pBuffer+1, nPacketLen-1, sockAddr.sin_addr.S_un.S_addr, sockAddr.sin_port);
						/*}else{
							theApp.natbridge->Process((char*)pBuffer+1, nPacketLen-1, sockAddr.sin_addr.S_un.S_addr, sockAddr.sin_port);
						}*/

						break;
					}
					//case OP_VC_NAT_HEADER+1:
					//	if(CGlobalVariable::natthread)
					//		CGlobalVariable::natthread->ProcessPacket2((uchar)(pBuffer+1), pBuffer+2, nPacketLen-2, sockAddr.sin_addr.S_un.S_addr, sockAddr.sin_port);
					//	break;
					default:
					{
						CString strError;
						strError.Format(_T("Unknown protocol 0x%02x"), pBuffer[0]);
						throw strError;
					}
				}
			}
			catch(CFileException* error)
			{
				error->Delete();
				strError = _T("Invalid packet received");
			}
			catch(CMemoryException* error)
			{
				error->Delete();
				strError = _T("Memory exception");
			}
			catch(CString error)
			{
				strError = error;
			}
			catch(Kademlia::CIOException* error)
			{
				error->Delete();
				strError = _T("Invalid packet received");
			}
			catch(CException* error)
			{
				error->Delete();
				strError = _T("General packet error");
			}
	#ifndef _DEBUG
			catch(...)
			{
				strError = _T("Unknown exception");
				ASSERT(0);
			}
	#endif
			if (thePrefs.GetVerbose() && !strError.IsEmpty())
			{
				CString strClientInfo;
				CUpDownClient* client;
				if (pBuffer[0] == OP_EMULEPROT)
					client = CGlobalVariable::clientlist->FindClientByIP_UDP(sockAddr.sin_addr.S_un.S_addr, ntohs(sockAddr.sin_port));
				else
					client = CGlobalVariable::clientlist->FindClientByIP_KadPort(sockAddr.sin_addr.S_un.S_addr, ntohs(sockAddr.sin_port));
				if (client)
					strClientInfo = client->DbgGetClientInfo();
				else
					strClientInfo.Format(_T("%s:%u"), ipstr(sockAddr.sin_addr), ntohs(sockAddr.sin_port));

				DebugLogWarning(_T("Client UDP socket: prot=0x%02x  opcode=0x%02x  sizeaftercrypt=%u realsize=%u  %s: %s"), pBuffer[0], pBuffer[1], nPacketLen, nRealLen, strError, strClientInfo);
			}
		}
		else if (nPacketLen == SOCKET_ERROR)
		{
			DWORD dwError = WSAGetLastError();
			if (dwError == WSAECONNRESET)
			{
				// Depending on local and remote OS and depending on used local (remote?) router we may receive
				// WSAECONNRESET errors. According some KB articles, this is a special way of winsock to report 
				// that a sent UDP packet was not received by the remote host because it was not listening on 
				// the specified port -> no eMule running there.
				//
				// TODO: So, actually we should do something with this information and drop the related Kad node 
				// or eMule client...
				;
			}
			if (thePrefs.GetVerbose() && dwError != WSAECONNRESET)
			{
				CString strClientInfo;
				if (iSockAddrLen > 0 && sockAddr.sin_addr.S_un.S_addr != 0 && sockAddr.sin_addr.S_un.S_addr != INADDR_NONE)
					strClientInfo.Format(_T(" from %s:%u"), ipstr(sockAddr.sin_addr), ntohs(sockAddr.sin_port));
				DebugLogError(_T("Error: Client UDP socket, failed to receive data%s: %s"), strClientInfo, GetErrorMessage(dwError, 1));
			}
		}
	}
}

bool CClientUDPSocket::ProcessPacket(const BYTE* packet, UINT size, uint8 opcode, uint32 ip, uint16 port)
{
	if (!CSourceExchangeNAT::ProcessUDPPacket(packet, size, opcode, ip, port))
	{
		return true;
	}

	switch(opcode)
	{
		case OP_REASKCALLBACKUDP:
		{
			if (thePrefs.GetDebugClientUDPLevel() > 0)
				DebugRecv("OP_ReaskCallbackUDP", NULL, NULL, ip);
			theStats.AddDownDataOverheadOther(size);
			CUpDownClient* buddy = CGlobalVariable::clientlist->GetBuddy();
			if( buddy )
			{
				if( size < 17 || buddy->socket == NULL )
					break;
				if (!md4cmp(packet, buddy->GetBuddyID()))
				{
					PokeUInt32(const_cast<BYTE*>(packet)+10, ip);
					PokeUInt16(const_cast<BYTE*>(packet)+14, port);
					Packet* response = new Packet(OP_EMULEPROT);
					response->opcode = OP_REASKCALLBACKTCP;
					response->pBuffer = new char[size];
					memcpy(response->pBuffer, packet+10, size-10);
					response->size = size-10;
					if (thePrefs.GetDebugClientTCPLevel() > 0)
						DebugSend("OP__ReaskCallbackTCP", buddy);
					theStats.AddUpDataOverheadFileRequest(response->size);
					buddy->socket->SendPacket(response);
				}
			}
			break;
		}
		case OP_REASKFILEPING:
		{
			theStats.AddDownDataOverheadFileRequest(size);
			CSafeMemFile data_in(packet, size);
			uchar reqfilehash[16];
			data_in.ReadHash16(reqfilehash);
			CKnownFile* reqfile = CGlobalVariable::sharedfiles->GetFileByID(reqfilehash);
			
			bool bSenderMultipleIpUnknown = false;
			CUpDownClient* sender = CGlobalVariable::uploadqueue->GetWaitingClientByIP_UDP(ip, port, true, &bSenderMultipleIpUnknown);
			if (!reqfile)
			{
				if (thePrefs.GetDebugClientUDPLevel() > 0) {
					DebugRecv("OP_ReaskFilePing", NULL, reqfilehash, ip);
					DebugSend("OP__FileNotFound", NULL);
				}

				Packet* response = new Packet(OP_FILENOTFOUND,0,OP_EMULEPROT);
				theStats.AddUpDataOverheadFileRequest(response->size);
				if (sender != NULL)
					SendPacket(response, ip, port, sender->ShouldReceiveCryptUDPPackets(), sender->GetUserHash(), false, 0);
				else
					SendPacket(response, ip, port, false, NULL, false, 0);
				break;
			}
			if (sender)
			{
				if (thePrefs.GetDebugClientUDPLevel() > 0)
					DebugRecv("OP_ReaskFilePing", sender, reqfilehash);

				//Make sure we are still thinking about the same file
				if (md4cmp(reqfilehash, sender->GetUploadFileID()) == 0)
				{
					sender->AddAskedCount();
					sender->SetLastUpRequest();
					//I messed up when I first added extended info to UDP
					//I should have originally used the entire ProcessExtenedInfo the first time.
					//So now I am forced to check UDPVersion to see if we are sending all the extended info.
					//For now on, we should not have to change anything here if we change
					//anything to the extended info data as this will be taken care of in ProcessExtendedInfo()
					//Update extended info. 
					if (sender->GetUDPVersion() > 3)
					{
						sender->ProcessExtendedInfo(&data_in, reqfile);
					}
					//Update our complete source counts.
					else if (sender->GetUDPVersion() > 2)
					{
						uint16 nCompleteCountLast= sender->GetUpCompleteSourcesCount();
						uint16 nCompleteCountNew = data_in.ReadUInt16();
						sender->SetUpCompleteSourcesCount(nCompleteCountNew);
						if (nCompleteCountLast != nCompleteCountNew)
						{
							reqfile->UpdatePartsInfo();
						}
					}
					CSafeMemFile data_out(128);
					if(sender->GetUDPVersion() > 3)
					{
						if (reqfile->IsPartFile())
							((CPartFile*)reqfile)->WritePartStatus(&data_out);
						else
						{
							//Xman PowerRelease
							if (!reqfile->HideOvershares(&data_out, sender))
								data_out.WriteUInt16(0);
							//Xman end
						}
					}
					data_out.WriteUInt16((uint16)(CGlobalVariable::uploadqueue->GetWaitingPosition(sender)));
					if (thePrefs.GetDebugClientUDPLevel() > 0)
						DebugSend("OP__ReaskAck", sender);
					Packet* response = new Packet(&data_out, OP_EMULEPROT);
					response->opcode = OP_REASKACK;
					theStats.AddUpDataOverheadFileRequest(response->size);
					SendPacket(response, ip, port, sender->ShouldReceiveCryptUDPPackets(), sender->GetUserHash(), false, 0);
				}
				else
				{
					DebugLogError(_T("Client UDP socket; ReaskFilePing; reqfile does not match"));
					TRACE(_T("reqfile:         %s\n"), DbgGetFileInfo(reqfile->GetFileHash()));
					TRACE(_T("sender->GetRequestFile(): %s\n"), sender->GetRequestFile() ? DbgGetFileInfo(sender->GetRequestFile()->GetFileHash()) : _T("(null)"));
				}
			}
			else
			{
				if (thePrefs.GetDebugClientUDPLevel() > 0)
					DebugRecv("OP_ReaskFilePing", NULL, reqfilehash, ip);
				// Don't answer him. We probably have him on our queue already, but can't locate him. Force him to establish a TCP connection
				if (!bSenderMultipleIpUnknown){
					if ( ((uint32)CGlobalVariable::uploadqueue->GetWaitingUserCount() + 50) > min(DynamicPref.m_iWaitQueueThreshold,thePrefs.GetQueueSize()) )
					{
						if (thePrefs.GetDebugClientUDPLevel() > 0)
							DebugSend("OP__QueueFull", NULL);
						Packet* response = new Packet(OP_QUEUEFULL,0,OP_EMULEPROT);
						theStats.AddUpDataOverheadFileRequest(response->size);
						SendPacket(response, ip, port, false, NULL, false, 0); // we cannot answer this one encrypted since we dont know this client
					}
				}
				else{
					DebugLogWarning(_T("UDP Packet received - multiple clients with the same IP but different UDP port found. Possible UDP Portmapping problem, enforcing TCP connection. IP: %s, Port: %u"), ipstr(ip), port); 
				}
			}
			break;
		}
		case OP_QUEUEFULL:
		{
			theStats.AddDownDataOverheadFileRequest(size);
			CUpDownClient* sender = CGlobalVariable::downloadqueue->GetDownloadClientByIP_UDP(ip, port, true);
			if (thePrefs.GetDebugClientUDPLevel() > 0)
				DebugRecv("OP_QueueFull", sender, NULL, ip);
			if (sender && sender->UDPPacketPending()){
				sender->SetRemoteQueueFull(true);
				sender->UDPReaskACK(0);
			}
			else if (sender != NULL)
				DebugLogError(_T("Received UDP Packet (OP_QUEUEFULL) which was not requested (pendingflag == false); Ignored packet - %s"), sender->DbgGetClientInfo());
			break;
		}
		case OP_REASKACK:
		{
			theStats.AddDownDataOverheadFileRequest(size);
			CUpDownClient* sender = CGlobalVariable::downloadqueue->GetDownloadClientByIP_UDP(ip, port, true);
			if (thePrefs.GetDebugClientUDPLevel() > 0)
				DebugRecv("OP_ReaskAck", sender, NULL, ip);
			if (sender && sender->UDPPacketPending()){
				CSafeMemFile data_in(packet, size);
				if ( sender->GetUDPVersion() > 3 )
				{
					sender->ProcessFileStatus(true, &data_in, sender->GetRequestFile());
				}
				uint16 nRank = data_in.ReadUInt16();
				sender->SetRemoteQueueFull(false);
				sender->UDPReaskACK(nRank);
				sender->AddAskedCountDown();
			}
			else if (sender != NULL)
				DebugLogError(_T("Received UDP Packet (OP_REASKACK) which was not requested (pendingflag == false); Ignored packet - %s"), sender->DbgGetClientInfo());
			
			break;
		}
		case OP_FILENOTFOUND:
		{
			theStats.AddDownDataOverheadFileRequest(size);
			CUpDownClient* sender = CGlobalVariable::downloadqueue->GetDownloadClientByIP_UDP(ip, port, true);
			if (thePrefs.GetDebugClientUDPLevel() > 0)
				DebugRecv("OP_FileNotFound", sender, NULL, ip);
			if (sender && sender->UDPPacketPending()){
				sender->UDPReaskFNF(); // may delete 'sender'!
				sender = NULL;
			}
			else if (sender != NULL)
				DebugLogError(_T("Received UDP Packet (OP_FILENOTFOUND) which was not requested (pendingflag == false); Ignored packet - %s"), sender->DbgGetClientInfo());

			break;
		}
		case OP_PORTTEST:
		{
			if (thePrefs.GetDebugClientUDPLevel() > 0)
				DebugRecv("OP_PortTest", NULL, NULL, ip);
			theStats.AddDownDataOverheadOther(size);
			if (size == 1){
				if (packet[0] == 0x12){
					bool ret = CGlobalVariable::listensocket->SendPortTestReply('1', true);
					AddDebugLogLine(true, _T("UDP Portcheck packet arrived - ACK sent back (status=%i)"), ret);
				}
			}
			break;
		}
		case OP_DIRECTCALLBACKREQ:
		{
			if (thePrefs.GetDebugClientUDPLevel() > 0)
				DebugRecv("OP_DIRECTCALLBACKREQ", NULL, NULL, ip);
			if (!CGlobalVariable::clientlist->AllowCalbackRequest(ip)){
				DebugLogWarning(_T("Ignored DirectCallback Request because this IP (%s) has sent too many request within a short time"), ipstr(ip));
				break;
			}
			// do we accept callbackrequests at all?
			if (Kademlia::CKademlia::IsRunning() && Kademlia::CKademlia::IsFirewalled())
			{
				CGlobalVariable::clientlist->AddTrackCallbackRequests(ip);
				CSafeMemFile data(packet, size);
				uint16 nRemoteTCPPort = data.ReadUInt16();
				uchar uchUserHash[16];
				data.ReadHash16(uchUserHash);
				uint8 byConnectOptions = data.ReadUInt8();
				CUpDownClient* pRequester = CGlobalVariable::clientlist->FindClientByUserHash(uchUserHash, ip, nRemoteTCPPort);
				if (pRequester == NULL) {
					pRequester = new CEd2kUpDownClient(NULL, nRemoteTCPPort, ip, 0, 0, true);
					pRequester->SetUserHash(uchUserHash);
					CGlobalVariable::clientlist->AddClient(pRequester);
				}
				pRequester->SetConnectOptions(byConnectOptions, true, false);
				pRequester->SetDirectUDPCallbackSupport(false);
				pRequester->SetIP(ip);
				pRequester->SetUserPort(nRemoteTCPPort);
				DEBUG_ONLY( DebugLog(_T("Accepting incoming DirectCallbackRequest from %s"), pRequester->DbgGetClientInfo()) );
				pRequester->TryToConnect();
			}
			else
				DebugLogWarning(_T("Ignored DirectCallback Request because we do not accept DirectCall backs at all (%s)"), ipstr(ip));

			break;
		}
		default:
			theStats.AddDownDataOverheadOther(size);
			if (thePrefs.GetDebugClientUDPLevel() > 0)
			{
				CUpDownClient* sender = CGlobalVariable::downloadqueue->GetDownloadClientByIP_UDP(ip, port, true);
				Debug(_T("Unknown client UDP packet: host=%s:%u (%s) opcode=0x%02x  size=%u\n"), ipstr(ip), port, sender ? sender->DbgGetClientInfo() : _T(""), opcode, size);
			}
			return false;
	}
	return true;
}

void CClientUDPSocket::OnSend(int nErrorCode){
	if(CGlobalVariable::m_app_state != APP_STATE_RUNNING) return;
	if (nErrorCode){
		if (thePrefs.GetVerbose())
			DebugLogError(_T("Error: Client UDP socket, error on send event: %s"), GetErrorMessage(nErrorCode, 1));
		return;
	}

// ZZ:UploadBandWithThrottler (UDP) -->
    sendLocker.Lock();
    m_bWouldBlock = false;

    //  Comment UI
	/*if(!controlpacket_queue.IsEmpty()) {
        theApp.uploadBandwidthThrottler->QueueForSendingControlPacket(this);
    }*/
	if(!controlpacket_queue.IsEmpty()) {
		CGlobalVariable::uploadBandwidthThrottler->QueueForSendingControlPacket(this);
	}
	
    sendLocker.Unlock();
// <-- ZZ:UploadBandWithThrottler (UDP)
}

SocketSentBytes CClientUDPSocket::SendControlData(uint32 maxNumberOfBytesToSend, uint32 /*minFragSize*/){ // ZZ:UploadBandWithThrottler (UDP)
// ZZ:UploadBandWithThrottler (UDP) -->
	// NOTE: *** This function is invoked from a *different* thread!
    sendLocker.Lock();

    uint32 sentBytes = 0;
// <-- ZZ:UploadBandWithThrottler (UDP)

	while (!controlpacket_queue.IsEmpty() && !IsBusy() && sentBytes < maxNumberOfBytesToSend){ // ZZ:UploadBandWithThrottler (UDP)
		UDPPack* cur_packet = controlpacket_queue.GetHead();
		if( GetTickCount() - cur_packet->dwTime < UDPMAXQUEUETIME )
		{
			uint32 nLen = cur_packet->packet->size+2;
			uchar* sendbuffer = new uchar[nLen];
			memcpy(sendbuffer,cur_packet->packet->GetUDPHeader(),2);
			memcpy(sendbuffer+2,cur_packet->packet->pBuffer,cur_packet->packet->size);
			
			if (cur_packet->bEncrypt && (CGlobalVariable::GetPublicIP() > 0 || cur_packet->bKad)){
				nLen = EncryptSendClient(&sendbuffer, nLen, cur_packet->pachTargetClientHashORKadID, cur_packet->bKad,  cur_packet->nReceiverVerifyKey, (cur_packet->bKad ? Kademlia::CPrefs::GetUDPVerifyKey(cur_packet->dwIP) : (uint16)0));
				//DEBUG_ONLY(  AddDebugLogLine(DLP_VERYLOW, false, _T("Sent obfuscated UDP packet to clientIP: %s, Kad: %s, ReceiverKey: %u"), ipstr(cur_packet->dwIP), cur_packet->bKad ? _T("Yes") : _T("No"), cur_packet->nReceiverVerifyKey) );
			}

            if (!SendTo((char*)sendbuffer, nLen, cur_packet->dwIP, cur_packet->nPort)){
                sentBytes += nLen; // ZZ:UploadBandWithThrottler (UDP)

				controlpacket_queue.RemoveHead();
				delete cur_packet->packet;
				delete cur_packet;
            }
			delete[] sendbuffer;
		}
		else
		{
			controlpacket_queue.RemoveHead();
			delete cur_packet->packet;
			delete cur_packet;
		}
	}

// ZZ:UploadBandWithThrottler (UDP) -->
    //  Comment UI
	if(!IsBusy() && !controlpacket_queue.IsEmpty()) {
		CGlobalVariable::uploadBandwidthThrottler->QueueForSendingControlPacket(this);
    }
    sendLocker.Unlock();

    SocketSentBytes returnVal = { true, 0, sentBytes };
    return returnVal;
// <-- ZZ:UploadBandWithThrottler (UDP)
}

int CClientUDPSocket::SendTo(char* lpBuf,int nBufLen,uint32 dwIP, uint16 nPort){
	// NOTE: *** This function is invoked from a *different* thread!
	uint32 result = CAsyncSocket::SendTo(lpBuf,nBufLen,nPort,ipstr(dwIP));
	if (result == (uint32)SOCKET_ERROR){
		uint32 error = GetLastError();
		if (error == WSAEWOULDBLOCK){
			m_bWouldBlock = true;
			return -1;
		}
		if (thePrefs.GetVerbose())
			DebugLogError(_T("Error: Client UDP socket, failed to send data to %s:%u: %s"), ipstr(dwIP), nPort, GetErrorMessage(error, 1));
	}
	return 0;
}

bool CClientUDPSocket::SendPacket(Packet* packet, uint32 dwIP, uint16 nPort, bool bEncrypt, const uchar* pachTargetClientHashORKadID, bool bKad, uint32 nReceiverVerifyKey){
	UDPPack* newpending = new UDPPack;
	newpending->dwIP = dwIP;
	newpending->nPort = nPort;
	newpending->packet = packet;
	newpending->dwTime = GetTickCount();
	newpending->bEncrypt = bEncrypt && (pachTargetClientHashORKadID != NULL || (bKad && nReceiverVerifyKey != 0));
	newpending->bKad = bKad;
	newpending->nReceiverVerifyKey = nReceiverVerifyKey;

	if (newpending->bEncrypt && pachTargetClientHashORKadID != NULL)
		md4cpy(newpending->pachTargetClientHashORKadID, pachTargetClientHashORKadID);
	else
		md4clr(newpending->pachTargetClientHashORKadID);
// ZZ:UploadBandWithThrottler (UDP) -->
    sendLocker.Lock();
	controlpacket_queue.AddTail(newpending);
    sendLocker.Unlock();

    //  Comment UI
	CGlobalVariable::uploadBandwidthThrottler->QueueForSendingControlPacket(this);
	return true;
// <-- ZZ:UploadBandWithThrottler (UDP)
}

bool CClientUDPSocket::Create()
{
	//DWORD dwId;

	//CreateThread(NULL, 0, PrivateThread, this, 0, &dwId);
	//while(!m_nCreateState) Sleep(100);
	//
	//return m_nCreateState>0;
	return PrivateCreate();
}

bool CClientUDPSocket::Rebind()
{
	if (thePrefs.GetUDPPort() == m_port)
		return false;
	Close();
	return Create();
}

bool CClientUDPSocket::PrivateCreate()
{
	bool ret = true;

	if (thePrefs.GetUDPPort())
	{
		//  Comment UI
		//ret = CAsyncSocket::Create(thePrefs.GetUDPPort(), SOCK_DGRAM, FD_READ | FD_WRITE, theApp.GetBindAddress()/*thePrefs.GetBindAddrW()*/) != FALSE;	//Changed by thilon on 2006.10.19
		ret = CAsyncSocket::Create(thePrefs.GetUDPPort(), SOCK_DGRAM, FD_READ | FD_WRITE, NULL/*thePrefs.GetBindAddrW()*/) != FALSE;	
		if (ret)
			m_port = thePrefs.GetUDPPort();
	}

	if (ret)
	{
		m_port = thePrefs.GetUDPPort();
	}

//	m_nCreateState = ret? 1 : -1;
	return ret;

}

//DWORD WINAPI CClientUDPSocket::PrivateThread(LPVOID param)
//{
//#ifndef _AFXDLL 
//#define _AFX_SOCK_THREAD_STATE AFX_MODULE_THREAD_STATE 
//#define _afxSockThreadState AfxGetModuleThreadState() 
//	_AFX_SOCK_THREAD_STATE* pState = _afxSockThreadState; 
//	if (pState->m_pmapSocketHandle == NULL) 
//		pState->m_pmapSocketHandle = new CMapPtrToPtr; 
//	if (pState->m_pmapDeadSockets == NULL) 
//		pState->m_pmapDeadSockets = new CMapPtrToPtr; 
//	if (pState->m_plistSocketNotifications == NULL) 
//		pState->m_plistSocketNotifications = new CPtrList; 
//#endif
//	CClientUDPSocket * socket=(CClientUDPSocket*)param;
//	socket->PrivateCreate();
//
//	MSG msg;
//	while(GetMessage(&msg, NULL, 0, 0))
//	{
//		DispatchMessage(&msg);
//	}
//	delete CGlobalVariable::clientudp;		CGlobalVariable::clientudp = NULL;
//	return 0;
//}
