path: root/src/modules/dcc/requests.cpp

//=============================================================================
//
//   File : requests.cpp
//   Creation date : Tue Jul 23 02:44:38 2002 GMT by Szymon Stefanek
//
//   This file is part of the KVirc irc client distribution
//   Copyright (C) 2002 Szymon Stefanek (pragma at kvirc dot 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 opinion) 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.
//
//=============================================================================

#define _KVI_DEBUG_CHECK_RANGE_
#include "kvi_debug.h"
#include "kvi_settings.h"
#include "kvi_string.h"
#include "kvi_module.h"
#include "kvi_sparser.h"
#include "kvi_locale.h"
#include "kvi_out.h"
#include "kvi_console.h"
#include "kvi_netutils.h"
#include "kvi_frame.h"
#include "kvi_console.h"

#include "kvi_error.h"
#include "kvi_options.h"
#include "kvi_defaults.h"
#include "kvi_sharedfiles.h"
#include "kvi_mirccntrl.h"
#include "kvi_app.h"
#include "kvi_ircconnection.h"
#include "kvi_ircconnectionuserinfo.h"

#include "gsmcodec.h"
#include "broker.h"
#include "voice.h"
#include "utils.h"
#include "send.h"

#include <qfileinfo.h>

#ifdef COMPILE_ON_WINDOWS
	// Ugly Windoze compiler...
	#include "dialogs.h"
#endif

//#warning "KviOption_boolIgnoreDccChat and other types too"

extern KVIRC_API KviSharedFilesManager * g_pSharedFilesManager;
extern KviDccBroker * g_pDccBroker;

static void dcc_module_reply_errmsg(KviDccRequest * dcc,const QString& errText)
{
	dcc->ctcpMsg->msg->console()->connection()->sendFmtData(
		"NOTICE %s :%cERRMSG %s%c",
		dcc->ctcpMsg->msg->console()->connection()->encodeText(dcc->ctcpMsg->pSource->nick()).data(),0x01,
		dcc->ctcpMsg->msg->console()->connection()->encodeText(errText).data()
		,0x01);
}

static void dcc_module_request_error(KviDccRequest * dcc,const QString& errText)
{
	dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCERROR,
			__tr2qs_ctx("Unable to process the above request: %Q, %Q","dcc"),
			&errText,
			KVI_OPTION_BOOL(KviOption_boolNotifyFailedDccHandshakes) ? &(__tr2qs_ctx("Ignoring and notifying failure","dcc")) : &(__tr2qs_ctx("Ignoring","dcc")));

	if(KVI_OPTION_BOOL(KviOption_boolNotifyFailedDccHandshakes))
	{
		QString szError = QString("Sorry, your DCC %1 request can't be satisfied: %2").arg(dcc->szType.ptr()).arg(errText);
		dcc_module_reply_errmsg(dcc,szError);
	}
}

static bool dcc_module_check_concurrent_transfers_limit(KviDccRequest * dcc)
{
	if(KVI_OPTION_UINT(KviOption_uintMaxDccSendTransfers) > 0)
	{
		unsigned int uTransfers = KviDccFileTransfer::runningTransfersCount();
		if(uTransfers >= KVI_OPTION_UINT(KviOption_uintMaxDccSendTransfers))
		{
			KviStr szError(KviStr::Format,__tr2qs_ctx("Concurrent transfer limit reached (%u of %u transfers running)","dcc"),
				uTransfers,KVI_OPTION_UINT(KviOption_uintMaxDccSendTransfers));
			dcc_module_request_error(dcc,szError.ptr());
			return false;
		}
	}
	return true;
}

static bool dcc_module_check_limits(KviDccRequest * dcc)
{
	if(KVI_OPTION_UINT(KviOption_uintMaxDccSlots) > 0)
	{
		unsigned int uWindows = g_pDccBroker->dccWindowsCount();
		if(uWindows >= KVI_OPTION_UINT(KviOption_uintMaxDccSlots))
		{
			KviStr szError(KviStr::Format,__tr2qs_ctx("Slot limit reached (%u slots of %u)","dcc"),
				uWindows,KVI_OPTION_UINT(KviOption_uintMaxDccSlots));
			dcc_module_request_error(dcc,szError.ptr());
			return false;
		}
	}
	if(g_pDccBroker->dccBoxCount() >= 32)
	{
		// there are too many pending dcc requests: the user isn't watching....
		dcc_module_request_error(dcc,__tr2qs_ctx("Too many pending connections","dcc"));
		return false;
	}
	return true;
}

static void dcc_fill_local_nick_user_host(KviDccDescriptor * d,KviDccRequest * dcc)
{
	if(dcc->pConsole->connection())
	{
		d->szLocalNick       = dcc->pConsole->connection()->userInfo()->nickName();
		d->szLocalUser       = dcc->pConsole->connection()->userInfo()->userName();
		d->szLocalHost       = dcc->pConsole->connection()->userInfo()->hostName();
	} else {
		d->szLocalNick       = __tr_ctx("unknown","dcc");
		d->szLocalUser       = __tr2qs_ctx("unknown","dcc");
		d->szLocalHost       = __tr2qs_ctx("unknown","dcc");
	}
}

static void dcc_module_set_dcc_type(KviDccDescriptor * d,const char * szBaseType)
{
	d->szType = szBaseType;
#ifdef COMPILE_SSL_SUPPORT
	if(d->bIsSSL)d->szType.prepend('S');
#endif
	if(d->bIsTdcc)d->szType.prepend('T');
}


static bool dcc_module_normalize_target_data(KviDccRequest * dcc,KviStr &ipaddr,KviStr &port)
{
	if(!port.isUnsignedNum())
	{
		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			KviStr szError(KviStr::Format,__tr2qs_ctx("Invalid port number %s","dcc"),port.ptr());
			dcc_module_request_error(dcc,szError.ptr());
		}
		return false;
	}

	struct in_addr addr;

	if(ipaddr.isUnsignedNum())
	{
		addr.s_addr = htonl((unsigned long)ipaddr.toULong());
		QString tmp;
		if(!kvi_binaryIpToStringIp(addr,tmp))
		{
			if(!dcc->ctcpMsg->msg->haltOutput())
			{
				KviStr szError(KviStr::Format,__tr2qs_ctx("Invalid IP address in old format %s","dcc"),ipaddr.ptr());
				dcc_module_request_error(dcc,szError.ptr());
			}
			return false;
		}
		ipaddr = tmp;
	} else {
		if(!kvi_stringIpToBinaryIp(ipaddr,&addr))
		{
#ifdef COMPILE_IPV6_SUPPORT
			struct in6_addr addr6;
			if(kvi_stringIpToBinaryIp_V6(ipaddr,&addr6))
			{
				dcc->bIpV6 = true;
				return true; // IPV6 address.
			}
#endif
			if(!dcc->ctcpMsg->msg->haltOutput())
			{
				KviStr szError(KviStr::Format,__tr2qs_ctx("Invalid IP address %s","dcc"),ipaddr.ptr());
				dcc_module_request_error(dcc,szError.ptr());
			}
			return false;
		}
	}
	return true;
}


////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// CHAT
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

static void dccModuleParseDccChat(KviDccRequest *dcc)
{
	//
	// We have received a DCC CHAT request in the following form:
	//
	//     DCC CHAT chat <ipaddress> <port>
	//
	// This means that we're requested to setup an ACTIVE chat connection
	// ... Easy task :)
	//
	// Anybody understands the meaning of the secondo "chat" in there ?
	// It was meant to simplify the parsing ? :DDD
	//
	// There is a mIrc extension that allows <port> to be 0
	// and adds a last parameter that seems to be a random number (thnx YaP :)
	// that is used to keep track of the connection.
	// This extension is used by firewalled machines to initiate a DCC CHAT:
	// the receiving side should respond with a DCC CHAT offer
	// with the same random number appended, and then should listen for a connection.
	//
	// when a zero port request is initiated by another party we get
	// 
	//      DCC CHAT chat <fakeipaddress> 0 <tag>
	//
	// and we reply with
	//
	//      DCC CHAT chat <ourip> <ourport> <tag>
	//
	// when a zero port request is initiated by us we send out
	//
	//      DCC CHAT chat <fakeipaddress> 0 <tag>
	//
	// and we get
	//
	//      DCC CHAT chat <remoteip> <remoteport> <tag>
	//
	// Thus if there is a <tag> and the port is 0, then the remote party
	// wanted to estabilish a dcc with us and wants us to listen, but if the port is nonzero then
	// we have sent out a zero port request and the remote party acked it
	// thus we have to connect instead!
	//

	// First of all we check the dcc slot limits
	if(!dcc_module_check_limits(dcc))return;

	// Then we check the target host data
	if(!dcc_module_normalize_target_data(dcc,dcc->szParam2,dcc->szParam3))return;

	if(!kvi_strEqualCI(dcc->szParam1.ptr(),"chat"))
	{
		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCMSG,
				__tr2qs_ctx("The above request is broken: The second parameter is '%s' and should be 'chat', trying to continue","dcc"),dcc->szParam1.ptr());
		}
	}

	KviStr szExtensions = dcc->szType;
	szExtensions.cutRight(4); // cut off CHAT

#ifdef COMPILE_SSL_SUPPORT
	bool bSSLExtension   = szExtensions.contains('S',false);
#else //!COMPILE_SSL_SUPPORT
	if(szExtensions.contains('S',false))
	{
		dcc_module_request_error(dcc,__tr2qs_ctx("This executable has been compiled without SSL support, the SSL extension to DCC CHAT is not available","dcc"));
		return;
	}
#endif //!COMPILE_SSL_SUPPORT

	KviDccDescriptor * d = new KviDccDescriptor(dcc->pConsole);

	d->szNick            = dcc->ctcpMsg->pSource->nick();
	d->szUser            = dcc->ctcpMsg->pSource->username();
	d->szHost            = dcc->ctcpMsg->pSource->host();

	dcc_fill_local_nick_user_host(d,dcc);

	d->szIp              = dcc->szParam2.ptr();
	d->szPort            = dcc->szParam3.ptr();


	if(dcc->szParam4.hasData())
	{
		// zero port tag ?
		if(d->szPort == "0")
		{
			// zero port request
			if(KVI_OPTION_BOOL(KviOption_boolDccSendFakeAddressByDefault))
			{
				d->szFakeIp = KVI_OPTION_STRING(KviOption_stringDefaultDccFakeAddress);
				if(d->szFakeIp.isEmpty())KVI_OPTION_BOOL(KviOption_boolDccSendFakeAddressByDefault) = false;
			}
			d->setZeroPortRequestTag(dcc->szParam4.ptr());
			QString tmp;
			if(!dcc_kvs_get_listen_ip_address(0,d->console(),tmp))d->szListenIp = "0.0.0.0";
			else d->szListenIp=tmp;
			d->szListenPort = "0"; // any port is OK
			d->bAutoAccept       = KVI_OPTION_BOOL(KviOption_boolAutoAcceptDccChat);
			d->bActive           = false; // we must listen then...
		} else {
			// zero port acknowledge
			// check if this is a tag that we have sent out
			QString szTag = QString(dcc->szParam4.ptr());
			KviDccZeroPortTag * t = g_pDccBroker->findZeroPortTag(szTag);
			if(!t)
			{
				// hum.. not our tag
				
				// FIXME: As segnaled by PRAEDO, ezbounce seems to send a fourth parameter in response to /quote ezb log
				// Pragma: That's a bug in ezbounce, it sends the filesize of the log as a DCC CHAT parameter...
				//         The author probably copied and pasted the CTCP line from DCC SEND and forgot to remove the filesize.
				//         We *could* add an option to ignore the last parameter and treat it as a standard dcc chat
				//         request, but since we don't encourage bugs, we don't do it :D
				//         Mail me at pragma at kvirc dot net if you really think it's necessary.
				dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCMSG,
					__tr2qs_ctx("The above request is broken: it looks like a zero port tag acknowledge but I have either never seen this tag or it was sent more than 120 seconds ago","dcc"));
				dcc_module_request_error(dcc,__tr2qs_ctx("It seems that I haven't requested this dcc chat","dcc"));
				delete d;
				return;
			} else {
				g_pDccBroker->removeZeroPortTag(szTag);
			}

			d->bAutoAccept       = true; // auto-accept it (we have sent it out)
			d->bActive           = true;
		}
	} else {
		d->bAutoAccept       = KVI_OPTION_BOOL(KviOption_boolAutoAcceptDccChat);
		d->bActive           = true; // we have to connct (standard active chat)
	}

#ifdef COMPILE_SSL_SUPPORT
	d->bIsSSL            = bSSLExtension;
#endif

	dcc_module_set_dcc_type(d,"CHAT");
	d->triggerCreationEvent();

	g_pDccBroker->handleChatRequest(d);
}



////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// SEND
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

static void dccModuleParseDccRecv(KviDccRequest * dcc);

static void dccModuleParseDccSend(KviDccRequest *dcc)
{
//#warning "Ignore files depending on file type ? (MediaType ?)"
	//
	// We have received a DCC SEND request in the following form
	//
	//      DCC [ST]SEND <filename> <ipaddress> <port> <filesize>
	//
	// Now the things are a bit tricky... we eventually can
	// reply with a DCC RESUME and receive a DCC ACCEPT then
	// The format of these requests is:
	//
	//      DCC RESUME <filename> <port> <resumepos>
	//      ACCEPT <filename> <port> <resumepos>
	//
	// There is a mIrc extension that allows <port> to be 0
	// and adds a last parameter that seems to be a random number (thnx YaP :)
	// that is used to keep track of the connection.
	// This extension is used by firewalled machines to initiate a DCC SEND:
	// the receiving side should respond with a DCC SEND offer
	// with the same random number appended, listen for a connection, and receive the file
	// instead of sending it.
	//
	// when a zero port request is initiated by another party we get
	//      DCC SEND <filename> <fakeipaddress> 0 <filesize> <tag>
	// if (and only if) we want to resume we reply with
	//      DCC RESUME <filename> 0 <resumesize> <tag>
	// in this case the remote part replies again with
	//      DCC ACCEPT <filename> 0 <resumesize> <tag>
	// and we finally reply with
	//      DCC SEND <filename> <ourip> <ourport> <filesize> <tag>
	//
	// when a zero port request is initiated by us we send out
	//      DCC SEND <filename> <fakeipaddress> 0 <filesize> <tag>
	// and if the remote party wants to resume then we get
	//      DCC RESUME <filename> 0 <resumesize> <tag>
	// and we eventually reply with
	//      DCC ACCEPT <filename> 0 <resumesize> <tag>
	// and we finally get
	//      DCC SEND <filename> <remoteip> <remoteport> <filesize> <tag>
	//
	// Thus if there is a <tag> and the port is 0, then the remote party
	// is trying to send a file to us, but if the port is nonzero then
	// we have sent out a zero port request and the remote party acked it
	//

	if((!kvi_strEqualCS(dcc->szParam3.ptr(),"0")) && dcc->szParam5.hasData())
	{
		// DCC SEND <filename> <remoteip> <remoteport> <filesize> <tag>
		// zero port acknowledge: treat as a RECV that should look like
		// DCC [TS]RECV <filename> <remoteip> <remoteport> <resume-filesize>
		// but since we have stored the sharedfile with the name <tag>
		// we do exchange the params :)

		KviDccZeroPortTag * t = g_pDccBroker->findZeroPortTag(dcc->szParam5.ptr());
		if(t)
		{
			dcc->szParam4.sprintf("%u",t->m_uResumePosition);
			g_pDccBroker->removeZeroPortTag(dcc->szParam5.ptr());
		} else {
			// this should never happen since we always add
			// a zero port tag for out outgoing requests
			// but well... maybe the user did something behing our back...
			dcc->szParam4 = "0"; // no resume possible in this case
		}

		// swap the tag and the filename (we have added a fileoffer with this tag)
		dcc->szParam1 = dcc->szParam5;
		dcc->szParam5 = "";
		
		dccModuleParseDccRecv(dcc);
		return;
	}

	// First of all we check the transfer limits
	dcc->szParam1=dcc->pConsole->decodeText(dcc->szParam1);
	if(!dcc_module_check_limits(dcc))return;
	if(!dcc_module_check_concurrent_transfers_limit(dcc))return;

	// Then we ensure that the data that the remote end has sent are valid
	if(!dcc_module_normalize_target_data(dcc,dcc->szParam2,dcc->szParam3))return;

	if(!(dcc->szParam4.isUnsignedNum()))
	{
		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCMSG,
				__tr2qs_ctx("The above request is broken: The fourth parameter should be the file size but does not appear to be an unsigned number, trying to continue","dcc"),dcc->szParam4.ptr());
		}		
		dcc->szParam4 = __tr2qs_ctx("<unknown size>","dcc");
	}

	if(dcc->szParam1.contains('/'))
	{
		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCMSG,
				__tr2qs_ctx("The above request is broken: The filename contains path components, stripping the leading path and trying to continue","dcc"),dcc->szParam1.ptr());
		}		
		dcc->szParam1.cutToLast('/');
	}

	KviStr szExtensions = dcc->szType;
	szExtensions.cutRight(4); // cut off SEND

	bool bTurboExtension = szExtensions.contains('T',false);
#ifdef COMPILE_SSL_SUPPORT
	bool bSSLExtension   = szExtensions.contains('S',false);
#else //!COMPILE_SSL_SUPPORT
	if(szExtensions.contains('S',false))
	{
		dcc_module_request_error(dcc,__tr2qs_ctx("This executable has been compiled without SSL support, the SSL extension to DCC SEND is not available","dcc"));
		return;
	}
#endif //!COMPILE_SSL_SUPPORT

	KviDccDescriptor * d = new KviDccDescriptor(dcc->pConsole);
	d->szNick            = dcc->ctcpMsg->pSource->nick();
	d->szUser            = dcc->ctcpMsg->pSource->username();
	d->szHost            = dcc->ctcpMsg->pSource->host();
	dcc_fill_local_nick_user_host(d,dcc);

	d->szIp              = dcc->szParam2.ptr();
	d->szPort            = dcc->szParam3.ptr();
	d->szFileName        = dcc->szParam1.ptr();
	d->szFileSize        = dcc->szParam4.ptr();

	if(d->szPort=="0" && dcc->szParam5.hasData())
	{
		if(KVI_OPTION_BOOL(KviOption_boolDccSendFakeAddressByDefault))
		{
			d->szFakeIp = KVI_OPTION_STRING(KviOption_stringDefaultDccFakeAddress);
			if(d->szFakeIp.isEmpty())KVI_OPTION_BOOL(KviOption_boolDccSendFakeAddressByDefault) = false;
		}
		d->setZeroPortRequestTag(dcc->szParam5.ptr());
		QString tmp;
		if(!dcc_kvs_get_listen_ip_address(0,d->console(),tmp))d->szListenIp = "0.0.0.0";
		else d->szListenIp=QString(tmp);
		d->szListenPort = "0"; // any port is OK
		d->bSendRequest = true;
		d->szLocalFileSize = d->szFileSize;
	}

	d->bActive           = !d->isZeroPortRequest(); // we have to connect unless it is a zero port request

	d->bResume           = false;
	d->bRecvFile         = true;
	d->bIsTdcc           = bTurboExtension;
	d->bNoAcks           = d->bIsTdcc;
#ifdef COMPILE_SSL_SUPPORT
	d->bIsSSL            = bSSLExtension;
#endif
	d->bOverrideMinimize = false;
	d->bAutoAccept       = KVI_OPTION_BOOL(KviOption_boolAutoAcceptDccSend);

	d->bIsIncomingAvatar = g_pApp->findPendingAvatarChange(dcc->pConsole,d->szNick,d->szFileName);
	dcc_module_set_dcc_type(d,"RECV");
	if(KVI_OPTION_BOOL(KviOption_boolAutoAcceptIncomingAvatars))d->bAutoAccept = d->bAutoAccept || d->bIsIncomingAvatar;
	d->triggerCreationEvent();

	g_pDccBroker->recvFileManage(d);
}

static void dccModuleParseDccAccept(KviDccRequest *dcc)
{
	// this is usually DCC ACCEPT <filename> <port> <resumesize>
	// but may be also
	// DCC ACCEPT <filename> 0 <resumesize> <tag>
	if(!g_pDccBroker->handleResumeAccepted(dcc->szParam1.ptr(),dcc->szParam2.ptr(),dcc->szParam4.ptr()))
	{
//#warning "IF KviOption_boolReplyCtcpErrmsgOnInvalidAccept..."
		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			KviStr szError(KviStr::Format,__tr2qs_ctx("Can't proceed with DCC RECV: Transfer not initiated for file %s on port %s","dcc"),dcc->szParam1.ptr(),dcc->szParam2.ptr());
			dcc_module_request_error(dcc,szError.ptr());
		}
	}
}

static void dccModuleParseDccResume(KviDccRequest *dcc)
{
	// This is usually RESUME <filename> <port> <resumesize>
	
	// when a zero port request is initiated by us we send out
	//      DCC SEND <filename> <fakeipaddress> 0 <filesize> <tag>
	// and if the remote party wants to resume then we get
	//      DCC RESUME <filename> 0 <resumesize> <tag>
	// and we eventually reply with
	//      DCC ACCEPT <filename> 0 <resumesize> <tag>
	// and we finally get
	//      DCC SEND <filename> <remoteip> <remoteport> <filesize> <tag>

	bool bOk;
	unsigned int filePos = dcc->szParam3.toUInt(&bOk);
	if(!bOk)
	{
		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			KviStr szError(KviStr::Format,__tr2qs_ctx("Invalid resume position argument '%s'","dcc"),dcc->szParam3.ptr());
			dcc_module_request_error(dcc,szError.ptr());
		}
		return;
	}

	if(!g_pDccBroker->handleResumeRequest(dcc,dcc->szParam1.ptr(),dcc->szParam2.ptr(),filePos,dcc->szParam4.ptr()))
	{
//#warning "IF KviOption_boolReplyCtcpErrmsgOnInvalidResume..."
		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			KviStr szError(KviStr::Format,
					__tr2qs_ctx("Can't proceed with DCC SEND: Transfer not initiated for file %s on port %s, or invalid resume size","dcc"),
					dcc->szParam1.ptr(),dcc->szParam2.ptr());
			dcc_module_request_error(dcc,szError.ptr());
		}
	}
}


////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// RECV
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

static void dccModuleParseDccRecv(KviDccRequest * dcc)
{
	// DCC [TS]RECV <filename> <ipaddr> <port> <resume-filesize>
	if(!dcc_module_check_limits(dcc))return;
	if(!dcc_module_check_concurrent_transfers_limit(dcc))return;

	if(!dcc_module_normalize_target_data(dcc,dcc->szParam2,dcc->szParam3))return;

	if(!(dcc->szParam4.isUnsignedNum()))
	{
		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			dcc->ctcpMsg->msg->console()->outputNoFmt(KVI_OUT_DCCMSG,
				__tr2qs_ctx("The above request has resume file size missing, assuming a resume file size of 0","dcc"));
		}		
		dcc->szParam4 = "0";
	}

	if(dcc->szParam1.contains('/'))
	{
		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCMSG,
				__tr2qs_ctx("The above request is broken: The filename contains path components, stripping the leading path and trying to continue","dcc"),dcc->szParam1.ptr());
		}		
		dcc->szParam1.cutToLast('/');
	}

	KviStr szExtensions = dcc->szType;
	szExtensions.cutRight(4); // cut off RECV

	bool bTurboExtension = szExtensions.contains('T',false);
#ifdef COMPILE_SSL_SUPPORT
	bool bSSLExtension   = szExtensions.contains('S',false);
#else //!COMPILE_SSL_SUPPORT
	if(szExtensions.contains('S',false))
	{
		dcc_module_request_error(dcc,__tr2qs_ctx("This executable has been compiled without SSL support, the SSL extension to DCC RECV is not available","dcc"));
		return;
	}
#endif //!COMPILE_SSL_SUPPORT

	// If we have a file offer for this...do it automatically
	KviSharedFile * o = g_pSharedFilesManager->lookupSharedFile(dcc->szParam1.ptr(),dcc->ctcpMsg->pSource,0);
	if(o)
	{

		unsigned int uResumeSize = dcc->szParam4.toUInt(); // this will NEVER fail
		if(uResumeSize >= o->fileSize())
		{
			// senseless request
			KviStr szError(KviStr::Format,
					__tr2qs_ctx("Invalid RECV request: Position %u is is larger than file size","dcc"),uResumeSize);
			dcc_module_request_error(dcc,szError.ptr());
			return;
		}

		// ok...we have requested this send
//		#warning "Maybe remove this file offer now ?"
		KviDccDescriptor * d = new KviDccDescriptor(dcc->pConsole);

		d->szNick            = dcc->ctcpMsg->pSource->nick();
		d->szUser            = dcc->ctcpMsg->pSource->user();
		d->szHost            = dcc->ctcpMsg->pSource->host();

		d->szFileName        = dcc->szParam1.ptr();
		d->szFileSize        = dcc->szParam4.ptr();
  
		//d->bResume           = false; // This is actually useless

		d->szLocalFileName   = o->absFilePath();
		d->szLocalFileSize.setNum(o->fileSize()); // Should we look it up again ?


		d->bRecvFile         = false;
		d->bNoAcks           = bTurboExtension;

		d->bAutoAccept       = true;
		d->bIsIncomingAvatar = false;

		d->bIsTdcc           = bTurboExtension;
#ifdef COMPILE_SSL_SUPPORT
		d->bIsSSL            = bSSLExtension;
#endif

		d->bOverrideMinimize = false;

		// We know everything
		dcc_fill_local_nick_user_host(d,dcc);


		d->bDoTimeout        = true;

		d->szIp              = dcc->szParam2.ptr();
		d->szPort            = dcc->szParam3.ptr();

		d->bActive           = true;
		dcc_module_set_dcc_type(d,"SEND");
		d->triggerCreationEvent();
		g_pDccBroker->sendFileExecute(0,d);

		return;

	} else {

		dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCMSG,
			__tr2qs_ctx("%Q [%Q@%Q] is ready to receive the file \"%s\"","dcc"),
			&(dcc->ctcpMsg->pSource->nick()),
			&(dcc->ctcpMsg->pSource->username()),
			&(dcc->ctcpMsg->pSource->host()),
			dcc->szParam1.ptr());
		dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCMSG,
			__tr2qs_ctx("The remote client is listening on interface %s and port %s","dcc"),dcc->szParam2.ptr(),dcc->szParam3.ptr());
		KviStr szSwitches = "-c";
		if(bTurboExtension)szSwitches.prepend("-t ");
#ifdef COMPILE_SSL_SUPPORT
		if(bSSLExtension)szSwitches.prepend("-s ");
#endif
		dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCMSG,
			__tr2qs_ctx("Use %c\r![!dbl]dcc.send %s -i=%s -p=%s %Q\r/dcc.send %s -i=%s -p=%s %Q\r%c to send the file (or double-click on the socket)","dcc"),
			KVI_TEXT_BOLD,
			szSwitches.ptr(),
			dcc->szParam2.ptr(),dcc->szParam3.ptr(),&(dcc->ctcpMsg->pSource->nick()),
			szSwitches.ptr(),
			dcc->szParam2.ptr(),dcc->szParam3.ptr(),&(dcc->ctcpMsg->pSource->nick()),
			KVI_TEXT_BOLD);
	}
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// RSEND
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

static void dccModuleParseDccRSend(KviDccRequest *dcc)
{
	// DCC RSEND <filename> <filesize>
//#warning "Ignore files depending on file type ? (MediaType ?)"
	//
	// We have received a DCC RSEND request in the following form
	//
	//      DCC [ST]RSEND <filename> <filesize>
	//
	dcc->szParam1 = dcc->pConsole->decodeText(dcc->szParam1);
	if(!dcc_module_check_limits(dcc))return;
	if(!dcc_module_check_concurrent_transfers_limit(dcc))return;

	if(!(dcc->szParam2.isUnsignedNum()))
	{
		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCMSG,
				__tr2qs_ctx("The above request is broken: The fourth parameter should be the file size but does not appear to be an unsigned number; trying to continue","dcc"),dcc->szParam2.ptr());
		}		
		dcc->szParam2 = __tr_ctx("<unknown size>","dcc");
	}

	if(dcc->szParam1.contains('/'))
	{
		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCMSG,
				__tr2qs_ctx("The above request is broken: The filename contains path components, stripping the leading path and trying to continue","dcc"),dcc->szParam1.ptr());
		}		
		dcc->szParam1.cutToLast('/');
	}

	KviStr szExtensions = dcc->szType;
	szExtensions.cutRight(4); // cut off SEND

	bool bTurboExtension = szExtensions.contains('T',false);
#ifdef COMPILE_SSL_SUPPORT
	bool bSSLExtension   = szExtensions.contains('S',false);
#else //!COMPILE_SSL_SUPPORT
	if(szExtensions.contains('S',false))
	{
		dcc_module_request_error(dcc,__tr2qs_ctx("This executable has been compiled without SSL support, the SSL extension to DCC RSEND is not available","dcc"));
		return;
	}
#endif //!COMPILE_SSL_SUPPORT

//#warning "When behind a firewall, we should reply an error message and avoid setting up the listening connection"

	KviDccDescriptor * d = new KviDccDescriptor(dcc->pConsole);
	d->szNick            = dcc->ctcpMsg->pSource->nick();
	d->szUser            = dcc->ctcpMsg->pSource->username();
	d->szHost            = dcc->ctcpMsg->pSource->host();
	d->szIp              = __tr2qs_ctx("(unknown)","dcc");
	d->szPort            = d->szIp;
	QString tmp;
	if(!dcc_kvs_get_listen_ip_address(0,d->console(),tmp))
	{
		d->console()->output(KVI_OUT_DCCMSG,
			__tr2qs_ctx("No suitable interface to listen on, trying to continue anyway...","dcc"));
		d->szListenIp = "0.0.0.0";
	} else
		d->szListenIp=QString(tmp);

	d->szListenPort      = "0";
	dcc_fill_local_nick_user_host(d,dcc);


	d->szFileName        = dcc->szParam1.ptr();
	d->szFileSize        = dcc->szParam2.ptr();
	d->bActive           = false; // we have to listen!
	d->bResume           = false; 
	d->bRecvFile         = true;  // we have to receive the file!

#ifdef COMPILE_SSL_SUPPORT
	d->bIsSSL            = bSSLExtension;
#endif
	d->bIsTdcc           = bTurboExtension;
	d->bSendRequest      = true; // we have to send the [ST]RECV request back
	d->bNoAcks           = d->bIsTdcc;
	d->bOverrideMinimize = false;
	d->bAutoAccept       = KVI_OPTION_BOOL(KviOption_boolAutoAcceptDccSend);
	d->bIsIncomingAvatar = g_pApp->findPendingAvatarChange(dcc->pConsole,d->szNick.utf8().data(),d->szFileName.utf8().data());

	if(KVI_OPTION_BOOL(KviOption_boolDccSendFakeAddressByDefault))
	{
		d->szFakeIp = KVI_OPTION_STRING(KviOption_stringDefaultDccFakeAddress);
		if(d->szFakeIp.isEmpty())KVI_OPTION_BOOL(KviOption_boolDccSendFakeAddressByDefault) = false;
	}

	if(KVI_OPTION_BOOL(KviOption_boolAutoAcceptIncomingAvatars))d->bAutoAccept = d->bAutoAccept || d->bIsIncomingAvatar;

	dcc_module_set_dcc_type(d,"RECV");
	d->triggerCreationEvent();
	g_pDccBroker->recvFileManage(d);
}



////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// GET
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

static void dccModuleParseDccGet(KviDccRequest *dcc)
{
	// DCC [TS]GET <filename> [filesize]
	// -> DCC [TS]SEND <filename> <ipaddr> <port> <filesize>
	// ...
	dcc->szParam1=dcc->pConsole->decodeText(dcc->szParam1);
	bool bOk;
	unsigned int uSize = dcc->szParam2.toUInt(&bOk);
	if(!bOk)uSize = 0;

	if(!dcc_module_check_limits(dcc))return;
	if(!dcc_module_check_concurrent_transfers_limit(dcc))return;

	KviStr szExtensions = dcc->szType;
	szExtensions.cutRight(3); // cut off GET

	bool bTurboExtension = szExtensions.contains('T',false);
#ifdef COMPILE_SSL_SUPPORT
	bool bSSLExtension   = szExtensions.contains('S',false);
#else //!COMPILE_SSL_SUPPORT
	if(szExtensions.contains('S',false))
	{
		dcc_module_request_error(dcc,__tr2qs_ctx("This executable has been compiled without SSL support, the SSL extension to DCC GET is not available","dcc"));
		return;
	}
#endif //!COMPILE_SSL_SUPPORT

	KviSharedFile * o = g_pSharedFilesManager->lookupSharedFile(dcc->szParam1.ptr(),dcc->ctcpMsg->pSource,uSize);
	if(!o)
	{
		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			KviStr szError(KviStr::Format,
					__tr2qs_ctx("No file offer named '%s' (with size %s) available for %Q [%Q@%Q]","dcc"),
					dcc->szParam1.ptr(),uSize > 0 ? dcc->szParam2.ptr() : __tr_ctx("\"any\"","dcc"),
					&(dcc->ctcpMsg->pSource->nick()),
					&(dcc->ctcpMsg->pSource->username()),
					&(dcc->ctcpMsg->pSource->host()));
			dcc_module_request_error(dcc,szError.ptr());
		}
		return;
	}

//#warning "IF NOT IGNORE DCC GET!"

//#warning "CREATE IT MINIMIZED ETC..."
//#warning "MAYBE USE A DIALOG TO ACCEPT THE REQUEST ?"
//#warning "DO NOT ACCEPT /etc/* requests..."

	if(KVI_OPTION_BOOL(KviOption_boolCantAcceptIncomingDccConnections))
	{
		// we have to use DCC RSEND , otherwise it will not work
		KviStr szSubproto("RSEND");
		szSubproto.prepend(szExtensions);

		
		QString szFileName = QFileInfo(o->absFilePath()).fileName();
		if(o->name() != szFileName)
		{
			// BUG
			//   If the file offer was added with a name that is senseless (like "mediaXYZ" for an *.mp3 file)
			//   then we would be going to RSEND that name here: the remote user woulnd't be
			//   able to recognize the file.
			//   Here we add another temporary offer with the right filename.

			// now add a file offer , so he we will accept it automatically
			// 120 secs is a reasonable timeout
			QString szMask;
			dcc->ctcpMsg->pSource->mask(szMask,KviIrcMask::NickUserHost);

			KviSharedFile * pOld = o;
			o = g_pSharedFilesManager->addSharedFile(szFileName,o->absFilePath(),szMask,120);
			if(!o)o = pOld; // give up (FIXME: should we notify that ?)
		}

		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCMSG,
				__tr2qs_ctx("Accepting file request from %Q [%Q@%Q] for '%s' (real file: %Q), offering DCC %s since we can't accept incoming connections (user option)","dcc"),
				&(dcc->ctcpMsg->pSource->nick()),
				&(dcc->ctcpMsg->pSource->username()),
				&(dcc->ctcpMsg->pSource->host()),dcc->szParam1.ptr(),
				&(o->absFilePath()),szSubproto.ptr());
		}

		dcc->pConsole->connection()->sendFmtData("PRIVMSG %s :%cDCC %s %s %u%c",
			dcc->pConsole->connection()->encodeText(dcc->ctcpMsg->pSource->nick()).data(),
			0x01,szSubproto.ptr(),
			dcc->pConsole->connection()->encodeText(dcc->szParam1.ptr()).data(),o->fileSize(),0x01);
		return;
	}


	KviDccDescriptor * d = new KviDccDescriptor(dcc->pConsole);
	d->szNick            = dcc->ctcpMsg->pSource->nick();
	d->szLocalFileName   = o->absFilePath();
	d->szUser            = dcc->ctcpMsg->pSource->username();
	d->szHost            = dcc->ctcpMsg->pSource->host();
	d->bRecvFile         = false;
	dcc_fill_local_nick_user_host(d,dcc);
	
	QString tmp;
	if(!dcc_kvs_get_listen_ip_address(0,d->console(),tmp))
	{
		d->console()->output(KVI_OUT_DCCMSG,
			__tr2qs_ctx("No suitable interface to listen on, trying to continue anyway...","dcc"));
		d->szListenIp = "0.0.0.0";
	} else
		d->szListenIp=QString(tmp);
//#warning "DO STH WITH THIS PORT (HOW TO SPECIFY IT ?)"
	d->szListenPort      = "0"; // any port is ok

	if(KVI_OPTION_BOOL(KviOption_boolDccSendFakeAddressByDefault))
	{
		d->szFakeIp = KVI_OPTION_STRING(KviOption_stringDefaultDccFakeAddress);
		if(d->szFakeIp.isEmpty())KVI_OPTION_BOOL(KviOption_boolDccSendFakeAddressByDefault) = false;
	}

	d->bDoTimeout        = true;
	d->szIp              = __tr2qs_ctx("(unknown)","dcc");
	d->szPort            = d->szIp;
	d->bActive           = false;
	d->bSendRequest      = true;
	d->bIsTdcc           = bTurboExtension;
#ifdef COMPILE_SSL_SUPPORT
	d->bIsSSL            = bSSLExtension;
#endif
	d->bNoAcks           = d->bIsTdcc;
	d->bOverrideMinimize = false;

	dcc_module_set_dcc_type(d,"SEND");

	if(!dcc->ctcpMsg->msg->haltOutput())
	{
		dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCMSG,
			__tr2qs_ctx("Accepting file request from %Q [%Q@%Q] for '%s' (real file: %Q), offering DCC %Q","dcc"),
			&(dcc->ctcpMsg->pSource->nick()),
			&(dcc->ctcpMsg->pSource->username()),
			&(dcc->ctcpMsg->pSource->host()),
			dcc->szParam1.ptr(),
			&(o->absFilePath()),&(d->szType));
	}
	d->triggerCreationEvent();
	g_pDccBroker->sendFileExecute(0,d);
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// VOICE
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

static void dccModuleParseDccVoice(KviDccRequest *dcc)
{
	//
	// We have received a DCC VOICE request in the following form:
	//
	//     DCC VOICE codec <ipaddress> <port> <sample-rate>
	//
	// This means that we're requested to setup an ACTIVE voice connection
	// ... Easy task :)
	//

	if(!dcc_module_check_limits(dcc))return;

	if(!dcc_module_normalize_target_data(dcc,dcc->szParam2,dcc->szParam3))return;

#ifdef COMPILE_DISABLE_DCC_VOICE
	if(!dcc->ctcpMsg->msg->haltOutput())
	{
		dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCERROR,
			__tr2qs_ctx("The above request cannot be accepted: DCC VOICE support not enabled at compilation time ","dcc"));
		return;
	}
#endif
	//  Actually unused parameter
	if(!kvi_dcc_voice_is_valid_codec(dcc->szParam1.ptr()))
	{
		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCERROR,
				__tr2qs_ctx("The above request cannot be accepted: Unsupported codec '%s'","dcc"),dcc->szParam1.ptr());
			return;
		}
	}

	bool bOk;

	int iSampleRate = dcc->szParam4.toInt(&bOk);
	if(!bOk)
	{
		if(!dcc->ctcpMsg->msg->haltOutput())
		{
			dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCMSG,
				__tr2qs_ctx("The above request appears to be broken: Invalid sample-rate '%s', defaulting to 8000","dcc"),dcc->szParam4.ptr());
		}
		iSampleRate = 8000;
	}


	KviDccDescriptor * d = new KviDccDescriptor(dcc->pConsole);
	d->szNick            = dcc->ctcpMsg->pSource->nick();
	d->szUser            = dcc->ctcpMsg->pSource->username();
	d->szHost            = dcc->ctcpMsg->pSource->host();
	dcc_fill_local_nick_user_host(d,dcc);


	d->szIp              = dcc->szParam2.ptr();
	d->szPort            = dcc->szParam3.ptr();
	d->bActive           = true; // we have to connect
	d->bIsTdcc           = false;
	d->bNoAcks           = false; // this has no meaning in voice
	d->szCodec           = dcc->szParam1;
	d->iSampleRate       = iSampleRate;
	d->bOverrideMinimize = false;
	d->bAutoAccept       = KVI_OPTION_BOOL(KviOption_boolAutoAcceptDccVoice);
	dcc_module_set_dcc_type(d,"VOICE");
	d->triggerCreationEvent();
	g_pDccBroker->activeVoiceManage(d);
}


////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// CANVAS
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

static void dccModuleParseDccCanvas(KviDccRequest *dcc)
{
	//
	// We have received a DCC CANVAS request in the following form:
	//
	//     DCC CANVAS unused <ipaddress> <port>
	//
	// This means that we're requested to setup an ACTIVE canvas connection
	// ... Easy task :)
	//
	if(!dcc_module_check_limits(dcc))return;

	if(!dcc_module_normalize_target_data(dcc,dcc->szParam2,dcc->szParam3))return;

//  Actually unused parameter
//	if(!(kvi_strEqualCI("canvas",dcc->szParam1.ptr())))
//	{
//		if(!dcc->ctcpMsg->msg->haltOutput())
//		{
//			dcc->ctcpMsg->msg->console()->output(KVI_OUT_DCCMSG,
//				__tr("The above request is broken: the second parameter is '%s' and shoud be 'chat'; trying to continue"),dcc->szParam1.ptr());
//		}
//	}
#ifdef COMPILE_DCC_CANVAS
	KviDccDescriptor * d = new KviDccDescriptor(dcc->pConsole);
	d->szNick            = dcc->ctcpMsg->pSource->nick();
	d->szUser            = dcc->ctcpMsg->pSource->username();
	d->szHost            = dcc->ctcpMsg->pSource->host();
	dcc_fill_local_nick_user_host(d,dcc);


	d->szIp              = dcc->szParam2.ptr();
	d->szPort            = dcc->szParam3.ptr();
	d->bActive           = true; // we have to connect
	d->bIsTdcc           = false;
	d->bNoAcks           = false; // this has no meaning in canvas
	d->bOverrideMinimize = false;
	d->bAutoAccept       = KVI_OPTION_BOOL(KviOption_boolAutoAcceptDccCanvas);
	dcc_module_set_dcc_type(d,"CANVAS");
	d->triggerCreationEvent();
	g_pDccBroker->activeCanvasManage(d);
#endif
}


static void dccModuleParseDccList(KviDccRequest *dcc)
{
	// DCC LIST <mask> <ipaddr> <port>
	// FIXME!
}



typedef void (*dccParseProc)(KviDccRequest *);
typedef struct _dccParseProcEntry
{
	const char * type;
	dccParseProc proc;
} dccParseProcEntry;

#define KVI_NUM_KNOWN_DCC_TYPES 27

static dccParseProcEntry dccParseProcTable[KVI_NUM_KNOWN_DCC_TYPES]=
{
	{ "CHAT"   , dccModuleParseDccChat   },
	{ "SCHAT"  , dccModuleParseDccChat   },
	{ "SEND"   , dccModuleParseDccSend   },
	{ "TSEND"  , dccModuleParseDccSend   },
	{ "SSEND"  , dccModuleParseDccSend   },
	{ "TSSEND" , dccModuleParseDccSend   },
	{ "STSEND" , dccModuleParseDccSend   },
	{ "GET"    , dccModuleParseDccGet    },
	{ "SGET"   , dccModuleParseDccGet    },
	{ "TGET"   , dccModuleParseDccGet    },
	{ "STGET"  , dccModuleParseDccGet    },
	{ "TSGET"  , dccModuleParseDccGet    },
	{ "LIST"   , dccModuleParseDccList   },
	{ "ACCEPT" , dccModuleParseDccAccept },
	{ "RESUME" , dccModuleParseDccResume },
	{ "RECV"   , dccModuleParseDccRecv   },
	{ "SRECV"  , dccModuleParseDccRecv   },
	{ "TRECV"  , dccModuleParseDccRecv   },
	{ "TSRECV" , dccModuleParseDccRecv   },
	{ "STRECV" , dccModuleParseDccRecv   },
	{ "RSEND"  , dccModuleParseDccRSend  },
	{ "SRSEND" , dccModuleParseDccRSend  },
	{ "TRSEND" , dccModuleParseDccRSend  },
	{ "STRSEND", dccModuleParseDccRSend  },
	{ "TSRSEND", dccModuleParseDccRSend  },
	{ "CANVAS" , dccModuleParseDccCanvas },
	{ "VOICE"  , dccModuleParseDccVoice  }
};



// We want C linkage on this one: we want to be able to dlsym() it with a simple name
// FIXME: Is this portable enough ? Or is better to have a table entry ?

KVIMODULEEXPORTFUNC void dccModuleCtcpDccParseRoutine(KviDccRequest *dcc)
{
	dcc->szType.toUpper();
	
	for(int i=0;i<KVI_NUM_KNOWN_DCC_TYPES;i++)
	{
		if(kvi_strEqualCS(dccParseProcTable[i].type,dcc->szType.ptr()))
		{
			(dccParseProcTable[i].proc)(dcc);
			return;
		}
	}
	// ops...we don't know this dcc type
	if(!dcc->ctcpMsg->msg->haltOutput())
	{
		KviStr szError(KviStr::Format,
				__tr2qs_ctx("Unknown DCC type '%s'","dcc"),dcc->szType.ptr());
		dcc_module_request_error(dcc,szError.ptr());
	}
}