initial commit

git-svn-id: http://svn.miranda-ng.org/main/trunk@2 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c

1 files changed, 1178 insertions, 0 deletions

diff --git a/protocols/IcqOscarJ/icq_direct.cpp b/protocols/IcqOscarJ/icq_direct.cpp
new file mode 100644
index 0000000000..6a81a9b253
--- /dev/null
+++ b/protocols/IcqOscarJ/icq_direct.cpp
@@ -0,0 +1,1178 @@
+// ---------------------------------------------------------------------------80

+//                ICQ plugin for Miranda Instant Messenger

+//                ________________________________________

+// 

+// Copyright � 2000-2001 Richard Hughes, Roland Rabien, Tristan Van de Vreede

+// Copyright � 2001-2002 Jon Keating, Richard Hughes

+// Copyright � 2002-2004 Martin �berg, Sam Kothari, Robert Rainwater

+// Copyright � 2004-2010 Joe Kucera

+// 

+// 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

+//

+// -----------------------------------------------------------------------------

+//

+// File name      : $URL: http://miranda.googlecode.com/svn/trunk/miranda/protocols/IcqOscarJ/icq_direct.cpp $

+// Revision       : $Revision: 11570 $

+// Last change on : $Date: 2010-04-11 16:58:57 +0300 (Вс, 11 апр 2010) $

+// Last change by : $Author: jokusoftware $

+//

+// DESCRIPTION:

+//

+//  Describe me here please...

+//

+// -----------------------------------------------------------------------------

+

+#include "icqoscar.h"

+

+struct directthreadstartinfo

+{

+	int type;           // Only valid for outgoing connections

+	int incoming;       // 1=incoming, 0=outgoing

+	HANDLE hConnection; // only valid for incoming connections, handle to the connection

+	HANDLE hContact;    // Only valid for outgoing connections

+	void* pvExtra;      // Only valid for outgoing connections

+};

+

+static char client_check_data[] = {

+	"As part of this software beta version Mirabilis is "

+	"granting a limited access to the ICQ network, "

+	"servers, directories, listings, information and databases (\""

+	"ICQ Services and Information\"). The "

+	"ICQ Service and Information may databases (\""

+	"ICQ Services and Information\"). The "

+	"ICQ Service and Information may\0"

+};

+

+void CIcqProto::CloseContactDirectConns(HANDLE hContact)

+{

+	icq_lock l(directConnListMutex);

+

+	for ( int i = 0; i < directConns.getCount(); i++)

+	{

+		if (!hContact || directConns[i]->hContact == hContact)

+		{

+			HANDLE hConnection = directConns[i]->hConnection;

+

+			directConns[i]->hConnection = NULL; // do not allow reuse

+			NetLib_CloseConnection(&hConnection, FALSE);

+		}

+	}

+}

+

+

+directconnect* CIcqProto::FindFileTransferDC(filetransfer* ft)

+{

+	directconnect* dc = NULL;

+	icq_lock l(directConnListMutex);

+

+	for (int i = 0; i < directConns.getCount(); i++)

+	{

+		if ( directConns[i]->ft == ft )

+		{

+			dc = directConns[i];

+			break;

+		}

+	}

+

+	return dc;

+}

+

+

+filetransfer* CIcqProto::FindExpectedFileRecv(DWORD dwUin, DWORD dwTotalSize)

+{

+	filetransfer* pFt = NULL;

+	icq_lock l(expectedFileRecvMutex);

+

+	for (int i = 0; i < expectedFileRecvs.getCount(); i++)

+	{

+		if (expectedFileRecvs[i]->dwUin == dwUin && expectedFileRecvs[i]->dwTotalSize == dwTotalSize)

+		{

+			pFt = expectedFileRecvs[i];

+			expectedFileRecvs.remove( i );

+			break;

+		}

+	}

+

+	return pFt;

+}

+

+

+int CIcqProto::sendDirectPacket(directconnect* dc, icq_packet* pkt)

+{

+	int nResult = Netlib_Send(dc->hConnection, (const char*)pkt->pData, pkt->wLen + 2, 0);

+	if (nResult == SOCKET_ERROR)

+	{

+		NetLog_Direct("Direct %p socket error: %d, closing", dc->hConnection, GetLastError());

+		CloseDirectConnection(dc);

+	}

+

+	SAFE_FREE((void**)&pkt->pData);

+

+	return nResult;

+}

+

+directthreadstartinfo* CreateDTSI(HANDLE hContact, HANDLE hConnection, int type)

+{

+	directthreadstartinfo* dtsi = (directthreadstartinfo*)SAFE_MALLOC(sizeof(directthreadstartinfo));

+	dtsi->hContact = hContact;

+	dtsi->hConnection = hConnection;

+	if (type == -1)

+		dtsi->incoming = 1;

+	else

+		dtsi->type = type;

+

+	return dtsi;

+}

+

+// Check if we have an open and initialized DC with type

+// 'type' to the specified contact

+BOOL CIcqProto::IsDirectConnectionOpen(HANDLE hContact, int type, int bPassive)

+{

+	BOOL bIsOpen = FALSE, bIsCreated = FALSE;

+

+  {

+    icq_lock l(directConnListMutex);

+

+	  for (int i = 0; i < directConns.getCount(); i++)

+	  {

+		  if (directConns[i] && (directConns[i]->type == type))

+		  {

+			  if (directConns[i]->hContact == hContact)

+				  if (directConns[i]->initialised)

+				  {

+					  // Connection is OK

+					  bIsOpen = TRUE;

+					  // we are going to use the conn, so prevent timeout

+					  directConns[i]->packetPending = 1;

+					  break;

+				  }

+				  else

+					  bIsCreated = TRUE; // we found pending connection

+		  }

+	  }

+  }

+

+	if (!bPassive && !bIsCreated && !bIsOpen && type == DIRECTCONN_STANDARD && m_bDCMsgEnabled == 2)

+	{ // do not try to open DC to offline contact

+		if (getContactStatus(hContact) == ID_STATUS_OFFLINE) return FALSE;

+		// do not try to open DC if previous attempt was not successfull

+		if (getSettingByte(hContact, "DCStatus", 0)) return FALSE;

+

+		// Set DC status as tried

+		setSettingByte(hContact, "DCStatus", 1);

+		// Create a new connection

+		OpenDirectConnection(hContact, DIRECTCONN_STANDARD, NULL);

+	}

+

+	return bIsOpen;

+}

+

+// This function is called from the Netlib when someone is connecting to

+// one of our incomming DC ports

+void icq_newConnectionReceived(HANDLE hNewConnection, DWORD dwRemoteIP, void *pExtra)

+{

+	// Start a new thread for the incomming connection

+	CIcqProto* ppro = (CIcqProto*)pExtra;

+	ppro->ForkThread(( IcqThreadFunc )&CIcqProto::icq_directThread, CreateDTSI(NULL, hNewConnection, -1));

+}

+

+// Opens direct connection of specified type to specified contact

+void CIcqProto::OpenDirectConnection(HANDLE hContact, int type, void* pvExtra)

+{

+	// Create a new connection

+	directthreadstartinfo* dtsi = CreateDTSI(hContact, NULL, type);

+	dtsi->pvExtra = pvExtra;

+	ForkThread(( IcqThreadFunc )&CIcqProto::icq_directThread, dtsi);

+}

+

+// Safely close NetLib connection - do not corrupt direct connection list

+void CIcqProto::CloseDirectConnection(directconnect *dc)

+{

+	icq_lock l(directConnListMutex);

+

+	NetLib_CloseConnection(&dc->hConnection, FALSE);

+#ifdef _DEBUG

+	if (dc->hConnection)

+		NetLog_Direct("Direct conn closed (%p)", dc->hConnection);

+#endif

+}

+

+// Called from icq_newConnectionReceived when a new incomming dc is done

+// Called from OpenDirectConnection when a new outgoing dc is done

+// Called from SendDirectMessage when a new outgoing dc is done

+

+void __cdecl CIcqProto::icq_directThread( directthreadstartinfo *dtsi )

+{

+	directconnect dc = {0};

+	NETLIBPACKETRECVER packetRecv={0};

+	HANDLE hPacketRecver;

+	BOOL bFirstPacket = TRUE;

+	int nSkipPacketBytes = 0;

+	DWORD dwReqMsgID1;

+	DWORD dwReqMsgID2;

+

+	srand(time(NULL));

+

+  { // add to DC connection list

+		icq_lock l(directConnListMutex);

+		directConns.insert( &dc );

+	}

+

+	// Initialize DC struct

+	dc.hContact = dtsi->hContact;

+	dc.dwThreadId = GetCurrentThreadId();

+	dc.incoming = dtsi->incoming;

+	dc.hConnection = dtsi->hConnection;

+	dc.ft = NULL;

+

+	if (!dc.incoming)

+	{

+		dc.type = dtsi->type;

+		dc.dwRemoteExternalIP = getSettingDword(dtsi->hContact, "IP", 0);

+		dc.dwRemoteInternalIP = getSettingDword(dtsi->hContact, "RealIP", 0);

+		dc.dwRemotePort = getSettingWord(dtsi->hContact, "UserPort", 0);

+		dc.dwRemoteUin = getContactUin(dtsi->hContact);

+		dc.dwConnectionCookie = getSettingDword(dtsi->hContact, "DirectCookie", 0);

+		dc.wVersion = getSettingWord(dtsi->hContact, "Version", 0);

+

+		if (!dc.dwRemoteExternalIP && !dc.dwRemoteInternalIP)

+		{ // we do not have any ip, do not try to connect

+			SAFE_FREE((void**)&dtsi);

+			goto LBL_Exit;

+		}

+		if (!dc.dwRemotePort)

+		{ // we do not have port, do not try to connect

+			SAFE_FREE((void**)&dtsi);

+			goto LBL_Exit;

+		}

+

+		if (dc.type == DIRECTCONN_STANDARD)

+		{

+			// do nothing - some specific init for msg sessions

+		}

+		else if (dc.type == DIRECTCONN_FILE)

+		{

+			dc.ft = (filetransfer*)dtsi->pvExtra;

+			dc.dwRemotePort = dc.ft->dwRemotePort;

+		}

+		else if (dc.type == DIRECTCONN_REVERSE)

+		{

+			cookie_reverse_connect *pCookie = (cookie_reverse_connect*)dtsi->pvExtra;

+

+			dwReqMsgID1 = pCookie->dwMsgID1;

+			dwReqMsgID2 = pCookie->dwMsgID2;

+			dc.dwReqId = (DWORD)pCookie->ft;

+			SAFE_FREE((void**)&pCookie);

+		}

+	}

+	else

+	{

+		dc.type = DIRECTCONN_STANDARD;

+	}

+

+	SAFE_FREE((void**)&dtsi);

+

+	// Load local IP information

+	dc.dwLocalExternalIP = getSettingDword(NULL, "IP", 0);

+	dc.dwLocalInternalIP = getSettingDword(NULL, "RealIP", 0);

+

+	// Create outgoing DC

+	if (!dc.incoming)

+	{

+		NETLIBOPENCONNECTION nloc = {0};

+		IN_ADDR addr = {0}, addr2 = {0};

+

+		if (dc.dwRemoteExternalIP == dc.dwLocalExternalIP && dc.dwRemoteInternalIP)

+			addr.S_un.S_addr = htonl(dc.dwRemoteInternalIP);

+		else

+		{

+			addr.S_un.S_addr = htonl(dc.dwRemoteExternalIP);

+			// for different internal, try it also (for LANs with multiple external IP, VPNs, etc.)

+			if (dc.dwRemoteInternalIP != dc.dwRemoteExternalIP)

+				addr2.S_un.S_addr = htonl(dc.dwRemoteInternalIP);

+		}

+

+		// IP to connect to is empty, go away

+		if (!addr.S_un.S_addr)

+			goto LBL_Exit;

+		

+		nloc.szHost = inet_ntoa(addr);

+		nloc.wPort = (WORD)dc.dwRemotePort;

+		nloc.timeout = 8; // 8 secs to connect

+		dc.hConnection = NetLib_OpenConnection(m_hDirectNetlibUser, dc.type==DIRECTCONN_REVERSE?"Reverse ":NULL, &nloc);

+		if (!dc.hConnection && addr2.S_un.S_addr)

+		{ // first address failed, try second one if available

+			nloc.szHost = inet_ntoa(addr2);

+			dc.hConnection = NetLib_OpenConnection(m_hDirectNetlibUser, dc.type==DIRECTCONN_REVERSE?"Reverse ":NULL, &nloc);

+		}

+		if (!dc.hConnection)

+		{

+			if (CheckContactCapabilities(dc.hContact, CAPF_ICQDIRECT))

+			{ // only if the contact support ICQ DC connections

+				if (dc.type != DIRECTCONN_REVERSE)

+				{ // try reverse connect

+					cookie_reverse_connect *pCookie = (cookie_reverse_connect*)SAFE_MALLOC(sizeof(cookie_reverse_connect));

+					DWORD dwCookie;

+

+					NetLog_Direct("connect() failed (%d), trying reverse.", GetLastError());

+

+					if (pCookie)

+					{ // init cookie

+						InitMessageCookie(pCookie);

+						pCookie->bMessageType = MTYPE_REVERSE_REQUEST;

+						pCookie->hContact = dc.hContact;

+						pCookie->dwUin = dc.dwRemoteUin;

+						pCookie->type = dc.type;

+						pCookie->ft = dc.ft;

+						dwCookie = AllocateCookie(CKT_REVERSEDIRECT, 0, dc.hContact, pCookie);

+						icq_sendReverseReq(&dc, dwCookie, (cookie_message_data*)pCookie);

+						goto LBL_Exit;

+					}

+					

+					NetLog_Direct("Reverse failed (%s)", "malloc failed");

+				}

+			}

+			else // Set DC status to failed

+				setSettingByte(dc.hContact, "DCStatus", 2);

+

+			if (dc.type == DIRECTCONN_REVERSE) // failed reverse connection

+			{ // announce we failed

+				icq_sendReverseFailed(&dc, dwReqMsgID1, dwReqMsgID2, dc.dwReqId);

+			}

+			NetLog_Direct("connect() failed (%d)", GetLastError());

+			if (dc.type == DIRECTCONN_FILE)

+			{

+				BroadcastAck(dc.ft->hContact, ACKTYPE_FILE, ACKRESULT_FAILED, dc.ft, 0);

+				// Release transfer

+				SafeReleaseFileTransfer((void**)&dc.ft);

+			}

+			goto LBL_Exit;

+		}

+

+		if (dc.type == DIRECTCONN_FILE)

+			dc.ft->hConnection = dc.hConnection;

+

+		if (dc.wVersion > 6)

+		{

+			sendPeerInit_v78(&dc);

+		}

+		else

+		{

+			NetLog_Direct("Error: Unsupported direct protocol: %d, closing.", dc.wVersion);

+			CloseDirectConnection(&dc);

+			goto LBL_Exit;

+		}

+	}

+

+	hPacketRecver = (HANDLE)CallService(MS_NETLIB_CREATEPACKETRECVER, (WPARAM)dc.hConnection, 8192);

+	packetRecv.cbSize = sizeof(packetRecv);

+	packetRecv.bytesUsed = 0;

+

+	// Packet receiving loop

+

+	while (dc.hConnection)

+	{

+		int recvResult;

+

+		packetRecv.dwTimeout = dc.wantIdleTime ? 0 : 600000;

+

+		recvResult = CallService(MS_NETLIB_GETMOREPACKETS, (WPARAM)hPacketRecver, (LPARAM)&packetRecv);

+		if (recvResult == 0)

+		{

+			NetLog_Direct("Clean closure of direct socket (%p)", dc.hConnection);

+			break;

+		}

+

+		if (recvResult == SOCKET_ERROR)

+		{

+			if (GetLastError() == ERROR_TIMEOUT)

+			{ // TODO: this will not work on some systems

+				if (dc.wantIdleTime)

+				{

+					switch (dc.type)

+					{

+					case DIRECTCONN_FILE:

+						handleFileTransferIdle(&dc);

+						break;

+					}

+				}

+				else if (dc.packetPending)

+				{ // do we expect packet soon?

+					NetLog_Direct("Keeping connection, packet pending.");

+				}

+				else

+				{

+					NetLog_Direct("Connection inactive for 10 minutes, closing.");

+					break;

+				}

+			}

+			else

+			{

+				NetLog_Direct("Abortive closure of direct socket (%p) (%d)", dc.hConnection, GetLastError());

+				break;

+			}

+		}

+

+		if (dc.type == DIRECTCONN_CLOSING)

+			packetRecv.bytesUsed = packetRecv.bytesAvailable;

+		else if (packetRecv.bytesAvailable < nSkipPacketBytes)

+		{ // the whole buffer needs to be skipped

+			nSkipPacketBytes -= packetRecv.bytesAvailable;

+			packetRecv.bytesUsed = packetRecv.bytesAvailable;

+		}

+		else

+		{

+			int i;

+

+			for (i = nSkipPacketBytes, nSkipPacketBytes = 0; i + 2 <= packetRecv.bytesAvailable;)

+			{ 

+				WORD wLen = *(WORD*)(packetRecv.buffer + i);

+

+				if (bFirstPacket)

+				{

+					if (wLen > 64)

+					{ // roughly check first packet size

+						NetLog_Direct("Error: Overflowed packet, closing connection.");

+						CloseDirectConnection(&dc);

+						break;

+					}

+					bFirstPacket = FALSE;

+				}

+				else

+				{

+					if (packetRecv.bytesAvailable >= i + 2 && wLen > 8190)

+					{ // check for too big packages

+						NetLog_Direct("Error: Package too big: %d bytes, skipping.");

+						nSkipPacketBytes = wLen;

+						packetRecv.bytesUsed = i + 2;

+						break;

+					}

+				}

+

+				if (wLen + 2 + i > packetRecv.bytesAvailable)

+					break;

+

+				if (dc.type == DIRECTCONN_STANDARD && wLen && packetRecv.buffer[i + 2] == 2)

+				{

+					if (!DecryptDirectPacket(&dc, packetRecv.buffer + i + 3, (WORD)(wLen - 1)))

+					{

+						NetLog_Direct("Error: Corrupted packet encryption, ignoring packet");

+						i += wLen + 2;

+						continue;

+					}

+				}

+#ifdef _DEBUG

+				NetLog_Direct("New direct package");

+#endif

+				if (dc.type == DIRECTCONN_FILE && dc.initialised)

+					handleFileTransferPacket(&dc, packetRecv.buffer + i + 2, wLen);

+				else

+					handleDirectPacket(&dc, packetRecv.buffer + i + 2, wLen);

+

+				i += wLen + 2;

+			}

+			packetRecv.bytesUsed = i;

+		}

+	}

+

+	// End of packet receiving loop

+

+	NetLib_SafeCloseHandle(&hPacketRecver);

+	CloseDirectConnection(&dc);

+

+	if (dc.ft)

+	{

+		if (dc.ft->fileId != -1)

+		{

+			_close(dc.ft->fileId);

+			BroadcastAck(dc.ft->hContact, ACKTYPE_FILE, dc.ft->dwBytesDone==dc.ft->dwTotalSize ? ACKRESULT_SUCCESS : ACKRESULT_FAILED, dc.ft, 0);

+		}

+		else if (dc.ft->hConnection)

+			BroadcastAck(dc.ft->hContact, ACKTYPE_FILE, ACKRESULT_FAILED, dc.ft, 0);

+

+		SafeReleaseFileTransfer((void**)&dc.ft);

+		_chdir("\\");    /* so we don't leave a subdir handle open so it can't be deleted */

+	}

+

+LBL_Exit:

+  { // remove from DC connection list

+		icq_lock l(directConnListMutex);

+		directConns.remove( &dc );

+	}

+}

+

+

+void CIcqProto::handleDirectPacket(directconnect* dc, PBYTE buf, WORD wLen)

+{

+	if (wLen < 1)

+		return;

+

+	switch (buf[0])

+	{

+	case PEER_FILE_INIT: // first packet of a file transfer

+#ifdef _DEBUG

+		NetLog_Direct("Received PEER_FILE_INIT from %u",dc->dwRemoteUin);

+#endif

+		if (dc->handshake)

+			handleFileTransferPacket(dc, buf, wLen);

+		else

+			NetLog_Direct("Received %s on uninitialised DC, ignoring.", "PEER_FILE_INIT");

+

+		break;

+

+	case PEER_INIT_ACK: // This is sent as a response to our PEER_INIT packet

+		if (wLen != 4)

+		{

+			NetLog_Direct("Error: Received malformed PEER_INITACK from %u", dc->dwRemoteUin);

+			break;

+		}

+#ifdef _DEBUG

+		NetLog_Direct("Received PEER_INITACK from %u on %s DC", dc->dwRemoteUin, dc->incoming?"incoming":"outgoing");

+#endif

+		if (dc->incoming) dc->handshake = 1;

+

+		if (dc->incoming && dc->type == DIRECTCONN_REVERSE)

+		{

+			cookie_reverse_connect *pCookie;

+

+			dc->incoming = 0;

+

+			if (FindCookie(dc->dwReqId, NULL, (void**)&pCookie) && pCookie)

+			{ // valid reverse DC, check and init session

+				FreeCookie(dc->dwReqId);

+				if (pCookie->dwUin == dc->dwRemoteUin)

+				{ // valid connection

+					dc->type = pCookie->type;

+					dc->ft = (filetransfer*)pCookie->ft;

+					dc->hContact = pCookie->hContact;

+					if (dc->type == DIRECTCONN_STANDARD)

+					{ // init message session

+						sendPeerMsgInit(dc, 0);

+					}

+					else if (dc->type == DIRECTCONN_FILE)

+					{ // init file session

+						sendPeerFileInit(dc);

+						dc->initialised = 1;

+					}

+					SAFE_FREE((void**)&pCookie);

+					break;

+				}

+				else

+				{

+					SAFE_FREE((void**)&pCookie);

+					NetLog_Direct("Error: Invalid connection (UINs does not match).");

+					CloseDirectConnection(dc);

+					return;

+				}

+			}

+			else

+			{

+				NetLog_Direct("Error: Received unexpected reverse DC, closing.");

+				CloseDirectConnection(dc);

+				return; 

+			}

+		}

+		break;

+

+	case PEER_INIT:       /* connect packet */

+#ifdef _DEBUG

+		NetLog_Direct("Received PEER_INIT");

+#endif

+		buf++;

+

+		if (wLen < 3)

+			return;

+

+		unpackLEWord(&buf, &dc->wVersion);

+

+		if (dc->wVersion > 6)

+		{ // we support only versions 7 and up

+			WORD wSecondLen;

+			DWORD dwUin;

+			DWORD dwPort;

+			DWORD dwCookie;

+			HANDLE hContact;

+

+			if (wLen != 0x30)

+			{

+				NetLog_Direct("Error: Received malformed PEER_INIT");

+				return;

+			}

+

+			unpackLEWord(&buf, &wSecondLen);

+			if (wSecondLen && wSecondLen != 0x2b)

+			{ // OMG? GnomeICU sets this to zero

+				NetLog_Direct("Error: Received malformed PEER_INIT");

+				return;

+			}

+

+			unpackLEDWord(&buf, &dwUin);

+			if (dwUin != m_dwLocalUIN)

+			{

+				NetLog_Direct("Error: Received PEER_INIT targeted to %u", dwUin);

+				CloseDirectConnection(dc);

+				return;

+			}

+

+			buf += 2;   /* 00 00 */

+			unpackLEDWord(&buf, &dc->dwRemotePort);

+			unpackLEDWord(&buf, &dc->dwRemoteUin);

+			unpackDWord(&buf, &dc->dwRemoteExternalIP);

+			unpackDWord(&buf, &dc->dwRemoteInternalIP);

+			buf ++;     /* 04: accept direct connections */

+			unpackLEDWord(&buf, &dwPort);

+			if (dwPort != dc->dwRemotePort)

+			{

+				NetLog_Direct("Error: Received malformed PEER_INIT (invalid port)");

+				return;

+			}

+			unpackLEDWord(&buf, &dwCookie);

+

+			buf += 8; // Unknown stuff

+			unpackLEDWord(&buf, &dc->dwReqId);

+

+			if (dc->dwRemoteUin || !dc->dwReqId)

+			{ // OMG! Licq sends on reverse connection empty uin

+				hContact = HContactFromUIN(dc->dwRemoteUin, NULL);

+				if (hContact == INVALID_HANDLE_VALUE)

+				{

+					NetLog_Direct("Error: Received PEER_INIT from %u not on my list", dwUin);

+					CloseDirectConnection(dc);

+					return;   /* don't allow direct connection with people not on my clist */

+				}

+

+				if (dc->incoming)

+				{ // this is the first PEER_INIT with our cookie

+					if (dwCookie != getSettingDword(hContact, "DirectCookie", 0))

+					{

+						NetLog_Direct("Error: Received PEER_INIT with broken cookie");

+						CloseDirectConnection(dc);

+						return;

+					}

+				}

+				else

+				{ // this is the second PEER_INIT with peer cookie

+					if (dwCookie != dc->dwConnectionCookie)

+					{

+						NetLog_Direct("Error: Received PEER_INIT with broken cookie");

+						CloseDirectConnection(dc);

+						return;

+					}

+				}

+			}

+

+			if (dc->incoming && dc->dwReqId)

+			{ // this is reverse connection

+				dc->type = DIRECTCONN_REVERSE;

+				if (!dc->dwRemoteUin)

+				{ // we need to load cookie (licq)

+					cookie_reverse_connect *pCookie;

+

+					if (FindCookie(dc->dwReqId, NULL, (void**)&pCookie) && pCookie)

+					{ // valid reverse DC, check and init session

+						dc->dwRemoteUin = pCookie->dwUin;

+						dc->hContact = pCookie->hContact;

+					}

+					else

+					{

+						NetLog_Direct("Error: Received unexpected reverse DC, closing.");

+						CloseDirectConnection(dc);

+						return; 

+					}

+				}

+			}

+

+			sendPeerInitAck(dc); // ack good PEER_INIT packet

+

+			if (dc->incoming)

+			{ // store good IP info

+				dc->hContact = hContact;

+				dc->dwConnectionCookie = dwCookie;

+				setSettingDword(dc->hContact, "IP", dc->dwRemoteExternalIP); 

+				setSettingDword(dc->hContact, "RealIP", dc->dwRemoteInternalIP);

+				sendPeerInit_v78(dc); // reply with our PEER_INIT

+			}

+			else // outgoing

+			{

+				dc->handshake = 1;

+

+				if (dc->type == DIRECTCONN_REVERSE)

+				{

+					dc->incoming = 1; // this is incoming reverse connection

+					dc->type = DIRECTCONN_STANDARD; // we still do not know type

+				}

+				else if (dc->type == DIRECTCONN_STANDARD)

+				{ // send PEER_MSGINIT

+					sendPeerMsgInit(dc, 0);

+				}

+				else if (dc->type == DIRECTCONN_FILE)

+				{

+					sendPeerFileInit(dc);

+					dc->initialised = 1;

+				}

+			}

+			// Set DC Status to successful

+			setSettingByte(dc->hContact, "DCStatus", 0);

+		}

+		else

+		{

+			NetLog_Direct("Unsupported direct protocol: %d, closing connection", dc->wVersion);

+			CloseDirectConnection(dc);

+		}

+		break;

+

+	case PEER_MSG:        /* messaging packets */

+#ifdef _DEBUG

+		NetLog_Direct("Received PEER_MSG from %u", dc->dwRemoteUin);

+#endif

+		if (dc->initialised)

+			handleDirectMessage(dc, buf + 1, (WORD)(wLen - 1));

+		else

+			NetLog_Direct("Received %s on uninitialised DC, ignoring.", "PEER_MSG");

+

+		break;

+

+	case PEER_MSG_INIT:   /* init message connection */

+		{ // it is sent by both contains GUID of message channel

+			DWORD q1,q2,q3,q4;

+

+			if (!m_bDCMsgEnabled)

+			{ // DC messaging disabled, close connection

+				NetLog_Direct("Messaging DC requested, denied");

+				CloseDirectConnection(dc);

+				break;

+			}

+

+#ifdef _DEBUG

+			NetLog_Direct("Received PEER_MSG_INIT from %u",dc->dwRemoteUin);

+#endif

+			buf++;

+			if (wLen != 0x21)

+				break;

+

+			if (!dc->handshake)

+			{

+				NetLog_Direct("Received %s on unitialised DC, ignoring.", "PEER_MSG_INIT");

+				break;

+			}

+

+			buf += 4;   /* always 10 */

+			buf += 4;   /* some id */

+			buf += 4;   /* sequence - always 0 on incoming */

+			unpackDWord(&buf, &q1);   // session type GUID

+			unpackDWord(&buf, &q2);

+			if (!dc->incoming)

+			{ // skip marker on sequence 1

+				buf += 4;

+			}

+			unpackDWord(&buf, &q3);

+			unpackDWord(&buf, &q4);

+			if (!CompareGUIDs(q1,q2,q3,q4,PSIG_MESSAGE))

+			{ // This is not for normal messages, useless so kill.

+				if (CompareGUIDs(q1,q2,q3,q4,PSIG_STATUS_PLUGIN))

+				{

+					NetLog_Direct("Status Manager Plugin connections not supported, closing.");

+				}

+				else if (CompareGUIDs(q1,q2,q3,q4,PSIG_INFO_PLUGIN))

+				{

+					NetLog_Direct("Info Manager Plugin connection not supported, closing.");

+				}

+				else

+				{

+					NetLog_Direct("Unknown connection type init, closing.");

+				}

+				CloseDirectConnection(dc);

+				break;

+			}

+

+			if (dc->incoming)

+			{ // reply with our PEER_MSG_INIT

+				sendPeerMsgInit(dc, 1);

+			}

+			else

+			{ // connection initialized, ready to send message packet

+			}

+			NetLog_Direct("Direct message session ready.");

+			dc->initialised = 1;

+		}

+		break;

+

+	default:

+		NetLog_Direct("Unknown direct packet ignored.");

+		break;

+	}

+}

+

+void EncryptDirectPacket(directconnect* dc, icq_packet* p)

+{

+	unsigned long B1;

+	unsigned long M1;

+	unsigned long check;

+	unsigned int i;

+	unsigned char X1;

+	unsigned char X2;

+	unsigned char X3;

+	unsigned char* buf = (unsigned char*)(p->pData + 3);

+	unsigned char bak[6];

+	unsigned long offset;

+	unsigned long key;

+	unsigned long hex;

+	unsigned long size = p->wLen - 1;

+

+

+	if (dc->wVersion < 4)

+		return;  // no encryption necessary.

+

+

+	switch (dc->wVersion)

+	{

+	case 4:

+	case 5:

+		offset = 6;

+		break;

+

+	case 6:

+	case 7:

+	case 8:

+	case 9:

+	case 10:

+	default:

+		offset = 0;

+	}

+

+	// calculate verification data

+	M1 = (rand() % ((size < 255 ? size : 255)-10))+10;

+	X1 = buf[M1] ^ 0xFF;

+	X2 = rand() % 220;

+	X3 = client_check_data[X2] ^ 0xFF;

+	if (offset)

+	{

+		memcpy(bak, buf, sizeof(bak));

+		B1 = (buf[offset+4]<<24) | (buf[offset+6]<<16) | (buf[2]<<8) | buf[0];

+	}

+	else

+	{

+		B1 = (buf[4]<<24) | (buf[6]<<16) | (buf[4]<<8) | (buf[6]);

+	}

+

+	// calculate checkcode

+	check = (M1<<24) | (X1<<16) | (X2<<8) | X3;

+	check ^= B1;

+

+	// main XOR key

+	key = 0x67657268 * size + check;

+

+	// XORing the actual data

+	for (i = 0; i<(size+3)/4; i+=4)

+	{

+		hex = key + client_check_data[i&0xFF];

+		*(PDWORD)(buf + i) ^= hex;

+	}

+

+	// in TCPv4 are the first 6 bytes unencrypted

+	// so restore them

+	if (offset)

+		memcpy(buf, bak, sizeof(bak));

+

+	// storing the checkcode

+	*(PDWORD)(buf + offset) = check;

+}

+

+int DecryptDirectPacket(directconnect* dc, PBYTE buf, WORD wLen)

+{

+	unsigned long hex;

+	unsigned long key;

+	unsigned long B1;

+	unsigned long M1;

+	unsigned long check;

+	unsigned int i;

+	unsigned char X1;

+	unsigned char X2;

+	unsigned char X3;

+	unsigned char bak[6];

+	unsigned long size = wLen;

+	unsigned long offset;

+

+

+	if (dc->wVersion < 4)

+		return 1;  // no decryption necessary.

+

+	if (size < 4)

+		return 1;

+

+	if (dc->wVersion < 4)

+		return 1;

+

+	if (dc->wVersion == 4 || dc->wVersion == 5)

+	{

+		offset = 6;

+	}

+	else

+	{

+		offset = 0;

+	}

+

+	// backup the first 6 bytes

+	if (offset)

+		memcpy(bak, buf, sizeof(bak));

+

+	// retrieve checkcode

+	check = *(PDWORD)(buf+offset);

+

+	// main XOR key

+	key = 0x67657268 * size + check;

+

+	for (i=4; i<(size+3)/4; i+=4)

+	{

+		hex = key + client_check_data[i&0xFF];

+		*(PDWORD)(buf + i) ^= hex;

+	}

+

+	// retrive validate data

+	if (offset)

+	{

+		// in TCPv4 are the first 6 bytes unencrypted

+		// so restore them

+		memcpy(buf, bak, sizeof(bak));

+		B1 = (buf[offset+4]<<24) | (buf[offset+6]<<16) | (buf[2]<<8) | buf[0];

+	}

+	else

+	{

+		B1 = (buf[4]<<24) | (buf[6]<<16) | (buf[4]<<8) | (buf[6]<<0);

+	}

+

+	// special decryption

+	B1 ^= check;

+

+	// validate packet

+	M1 = (B1>>24) & 0xFF;

+	if (M1 < 10 || M1 >= size)

+	{

+		return 0;

+	}

+

+	X1 = buf[M1] ^ 0xFF;

+	if(((B1 >> 16) & 0xFF) != X1)

+	{

+		return 0;

+	}

+

+	X2 = (BYTE)((B1 >> 8) & 0xFF);

+	if (X2 < 220)

+	{

+		X3 = client_check_data[X2] ^ 0xFF;

+		if ((B1 & 0xFF) != X3)

+		{

+			return 0;

+		}

+	}

+#ifdef _DEBUG

+	{ // log decrypted data

+		char szTitleLine[128];

+		char* szBuf;

+		int titleLineLen;

+		int line;

+		int col;

+		int colsInLine;

+		char* pszBuf;

+

+

+		titleLineLen = null_snprintf(szTitleLine, 128, "DECRYPTED\n");

+		szBuf = (char*)_alloca(titleLineLen + ((wLen+15)>>4) * 76 + 1);

+		CopyMemory(szBuf, szTitleLine, titleLineLen);

+		pszBuf = szBuf + titleLineLen;

+

+		for (line = 0; ; line += 16)

+		{

+			colsInLine = min(16, wLen - line);

+			pszBuf += wsprintfA(pszBuf, "%08X: ", line);

+

+			for (col = 0; col<colsInLine; col++)

+				pszBuf += wsprintfA(pszBuf, "%02X%c", buf[line+col], (col&3)==3 && col!=15?'-':' ');

+

+			for (; col<16; col++)

+			{

+				lstrcpyA(pszBuf,"   ");

+				pszBuf+=3;

+			}

+

+			*pszBuf++ = ' ';

+			for (col = 0; col<colsInLine; col++)

+				*pszBuf++ = buf[line+col]<' ' ? '.' : (char)buf[line+col];

+			if(wLen-line<=16) break;

+			*pszBuf++='\n';

+		}

+		*pszBuf='\0';

+

+		Netlib_Logf( NULL, szBuf );

+	}

+#endif

+

+	return 1;

+}

+

+// This should be called only if connection already exists

+int CIcqProto::SendDirectMessage(HANDLE hContact, icq_packet *pkt)

+{

+	icq_lock l(directConnListMutex);

+

+	for (int i = 0; i < directConns.getCount(); i++)

+	{

+		if (directConns[i] == NULL)

+			continue;

+

+		if (directConns[i]->hContact == hContact)

+		{

+			if (directConns[i]->initialised)

+			{

+				// This connection can be reused, send packet and exit

+				NetLog_Direct("Sending direct message");

+

+				if (pkt->pData[2] == 2)

+					EncryptDirectPacket(directConns[i], pkt);

+

+				sendDirectPacket(directConns[i], pkt);

+				directConns[i]->packetPending = 0; // packet done

+

+				return TRUE; // Success

+			}

+			break; // connection not ready, use server instead

+		}

+	}

+

+	return FALSE; // connection pending, we failed, use server instead

+}

+

+// Sends a PEER_INIT packet through a DC

+// -----------------------------------------------------------------------

+// This packet is sent during direct connection initialization between two

+// ICQ clients. It is sent by the originator of the connection to start

+// the handshake and by the receiver directly after it has sent the

+// PEER_ACK packet as a reply to the originator's PEER_INIT. The values

+// after the COOKIE field have been added for v7.

+

+void CIcqProto::sendPeerInit_v78(directconnect* dc)

+{

+	icq_packet packet;

+

+	directPacketInit(&packet, 48);             // Full packet length

+	packByte(&packet, PEER_INIT);              // Command

+	packLEWord(&packet, dc->wVersion);         // Version

+	packLEWord(&packet, 43);                   // Data length

+	packLEDWord(&packet, dc->dwRemoteUin);     // UIN of remote user

+	packWord(&packet, 0);                      // Unknown

+	packLEDWord(&packet, wListenPort);         // Our port

+	packLEDWord(&packet, m_dwLocalUIN);          // Our UIN

+	packDWord(&packet, dc->dwLocalExternalIP); // Our external IP

+	packDWord(&packet, dc->dwLocalInternalIP); // Our internal IP

+	packByte(&packet, DC_TYPE);                // TCP connection flags

+	packLEDWord(&packet, wListenPort);         // Our port

+	packLEDWord(&packet, dc->dwConnectionCookie); // DC cookie

+	packLEDWord(&packet, WEBFRONTPORT);        // Unknown

+	packLEDWord(&packet, CLIENTFEATURES);      // Unknown

+	if (dc->type == DIRECTCONN_REVERSE)

+		packLEDWord(&packet, dc->dwReqId);       // Reverse Request Cookie

+	else

+		packDWord(&packet, 0);                   // Unknown

+

+	sendDirectPacket(dc, &packet);

+#ifdef _DEBUG

+	NetLog_Direct("Sent PEER_INIT to %u on %s DC", dc->dwRemoteUin, dc->incoming?"incoming":"outgoing");

+#endif

+}

+

+// Sends a PEER_INIT packet through a DC

+// -----------------------------------------------------------------------

+// This is sent to acknowledge a PEER_INIT packet.

+

+void CIcqProto::sendPeerInitAck(directconnect* dc)

+{

+	icq_packet packet;

+

+	directPacketInit(&packet, 4);              // Packet length

+	packLEDWord(&packet, PEER_INIT_ACK);       // 

+

+	sendDirectPacket(dc, &packet);

+#ifdef _DEBUG

+	NetLog_Direct("Sent PEER_INIT_ACK to %u on %s DC", dc->dwRemoteUin, dc->incoming?"incoming":"outgoing");

+#endif

+}

+

+// Sends a PEER_MSG_INIT packet through a DC

+// -----------------------------------------------------------------------

+// This packet starts message session.

+

+void CIcqProto::sendPeerMsgInit(directconnect* dc, DWORD dwSeq)

+{

+	icq_packet packet;

+

+	directPacketInit(&packet, 33);

+	packByte(&packet, PEER_MSG_INIT);

+	packLEDWord(&packet, 10);           // unknown

+	packLEDWord(&packet, 1);            // message connection

+	packLEDWord(&packet, dwSeq);        // sequence is 0,1

+	if (!dwSeq)

+	{

+		packGUID(&packet, PSIG_MESSAGE);  // message type GUID

+		packLEWord(&packet, 1);           // delimiter

+		packLEWord(&packet, 4);

+	}

+	else

+	{

+		packDWord(&packet, 0);            // first part of Message GUID

+		packDWord(&packet, 0);

+		packLEWord(&packet, 1);           // delimiter

+		packLEWord(&packet, 4);

+		packDWord(&packet, 0);            // second part of Message GUID

+		packDWord(&packet, 0);

+	}

+	sendDirectPacket(dc, &packet);

+#ifdef _DEBUG

+	NetLog_Direct("Sent PEER_MSG_INIT to %u on %s DC", dc->dwRemoteUin, dc->incoming?"incoming":"outgoing");

+#endif

+}

+

+// Sends a PEER_FILE_INIT packet through a DC

+// -----------------------------------------------------------------------

+// This packet configures file-transfer session.

+

+void CIcqProto::sendPeerFileInit(directconnect* dc)

+{

+	icq_packet packet;

+	DBVARIANT dbv;

+	char* szNick;

+	int nNickLen;

+

+	dbv.type = DBVT_DELETED;

+	if (getSettingString(NULL, "Nick", &dbv))

+		szNick = "";

+	else

+		szNick = dbv.pszVal;

+	nNickLen = strlennull(szNick);

+

+	directPacketInit(&packet, (WORD)(20 + nNickLen));

+	packByte(&packet, PEER_FILE_INIT);  /* packet type */

+	packLEDWord(&packet, 0);            /* unknown */

+	packLEDWord(&packet, dc->ft->dwFileCount);

+	packLEDWord(&packet, dc->ft->dwTotalSize);

+	packLEDWord(&packet, dc->ft->dwTransferSpeed);

+	packLEWord(&packet, (WORD)(nNickLen + 1));

+	packBuffer(&packet, (LPBYTE)szNick, (WORD)(nNickLen + 1));

+	sendDirectPacket(dc, &packet);

+#ifdef _DEBUG

+	NetLog_Direct("Sent PEER_FILE_INIT to %u on %s DC", dc->dwRemoteUin, dc->incoming?"incoming":"outgoing");

+#endif

+	ICQFreeVariant(&dbv);

+}