// command_factory.cpp

// 

// Copyright (c) 2006 - 2010 Accenture. All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

// 

// Initial Contributors:

// Accenture - Initial contribution

//

#include <f32file.h>

#include <fshell/common.mmh>

#include "command_factory.h"

#include "command_wrappers.h"

#include "commands.h"

#include "hello.h"

#include "kill.h"

#include "ps.h"

#include "undertaker.h"

#include "fuser.h"

#include "gobble.h"

#include "xmodem.h"

#include "ymodem.h"

#include "version.h"

//

// Constants.

//

//const TUid KFshellDllUid = {FSHELL_UID2_FSHELL_DLL};

const TUid KFshellExeUid = {FSHELL_UID2_FSHELL_EXE};

const TUint KPipsExeUidValue = 0x20004c45;

const TUid KPipsExeUid = { KPipsExeUidValue };

_LIT(KExecutableDir, "\\sys\\bin\\");

_LIT(KFshellPrefix, "fshell_"); // This	MUST be in lower case.

//

// CDummyCommandConstructor.

//

class CDummyCommandConstructor : public CCommandConstructorBase

	{

public:

	static CDummyCommandConstructor* NewLC(const TDesC& aCommandName);

private: // From CCommandConstructorBase.

	virtual MCommand* ConstructCommandL();

	virtual void AppendDescriptionL(RLtkBuf16& /*aBuf*/) const { }

	};

CDummyCommandConstructor* CDummyCommandConstructor::NewLC(const TDesC& aCommandName)

	{

	CDummyCommandConstructor* self = new(ELeave) CDummyCommandConstructor();

	CleanupStack::PushL(self);

	self->BaseConstructL(aCommandName);

	return self;

	}

MCommand* CDummyCommandConstructor::ConstructCommandL()

	{

	ASSERT(EFalse);

	return NULL;

	}

//

// CCommandFactory.

//

CCommandFactory* CCommandFactory::NewL(RFs& aFs)

	{

	CCommandFactory* self = new(ELeave) CCommandFactory(aFs);

	CleanupStack::PushL(self);

	self->ConstructL();

	CleanupStack::Pop(self);

	return self;

	}

CCommandFactory::~CCommandFactory()

	{

	Cancel();

	iCommands.ResetAndDestroy();

	iLock.Close();

	}

TInt CompareCommandNames(const CCommandConstructorBase& aCommand1, const CCommandConstructorBase& aCommand2)

	{

	return aCommand1.CommandName().Compare(aCommand2.CommandName());

	}

TInt CCommandFactory::FindCommandL(const TDesC& aCommandName)

	{

	CCommandConstructorBase* dummyCommand = CDummyCommandConstructor::NewLC(aCommandName);

	TInt ret = iCommands.FindInOrder(dummyCommand, TLinearOrder<CCommandConstructorBase>(CompareCommandNames));

	CleanupStack::PopAndDestroy(dummyCommand);

	return ret;

	}

void CCommandFactory::GetCommandInfoL(const TDesC& aCommand, RLtkBuf16& aDescriptionBuf)

	{

	CheckExternalCommands();

	WaitLC();

	TInt pos = FindCommandL(aCommand);

	User::LeaveIfError(pos);

	iCommands[pos]->AppendDescriptionL(aDescriptionBuf);

	CleanupStack::PopAndDestroy(); // WaitLC

	}

void KillAndCloseProcess(RProcess& aProcess)

	{

	if (aProcess.Handle() != KNullHandle && aProcess.Handle() != KCurrentProcessHandle)

		{

		aProcess.Kill(KErrGeneral);

		aProcess.Close();

		}

	}

MCommand* CCommandFactory::CreateCommandL(const TDesC& aCommandName, TError& aErrorContext, const TDesC& aArguments)

	{

	WaitLC();

	MCommand* command = NULL;

	RProcess process; // It makes DoCreateCommandL simpler if it doesn't have to worry about cleaning this up

	TRAPD(err, command = DoCreateCommandL(aCommandName, aArguments, process));

	if (err)

		{

		KillAndCloseProcess(process);

		aErrorContext.Set(err, TError::EFailedToConstructCommand, aCommandName);

		User::Leave(err);

		}

	CleanupStack::PopAndDestroy(); // WaitLC()

	return command;

	}

MCommand* CCommandFactory::DoCreateCommandL(const TDesC& aCommandName, const TDesC& aArguments, RProcess& aProcess)

	{

	RProcess& process(aProcess);

	TInt ret = FindCommandL(aCommandName);

	if (ret >= 0)

		{

		// (1) we explicitly know about it

		return iCommands[ret]->ConstructCommandL();

		}

	if (iFileSystemScanned)

		{

		// (2) We successfully scanned the file system (which means we had enough PlatSec capabilities to do so),

		//     so any command that we don't know about must be a process command.

		User::LeaveIfError(process.Create(aCommandName, aArguments));

		return CProcessCommand::NewL(aCommandName, process);

		}

	// We didn't manage to scan the file system, so this command could be any kind of external command.

	// See if a .exe extension was explicitly specified.

	_LIT(KExeSuffix, ".exe");

	if (aCommandName.Right(KExeSuffix().Length()).CompareF(KExeSuffix) == 0)

		{

		// (3) The user spelled it out for us.

		return CProcessCommand::NewL(aCommandName);

		}

	// Next, see if it's a process command prefixed with "fshell_".

	TFileName commandName(KFshellPrefix);

	commandName.Append(aCommandName);

	TInt err = process.Create(commandName, aArguments);

	if (err == KErrNone)

		{

		TUid uid2 = process.Type()[1];

		if (uid2 == KFshellExeUid)

			{

			// (6) It's an fshell exe.

			return CProcessCommand::NewL(commandName, process);

			}

		// Found a .exe called fshell_cmd, but it didn't have UID2 of KFshellExeUid. Ignore it and keep looking.

		KillAndCloseProcess(process);

		}

	// This is the fallback, a process command of some kind.

	err = process.Create(aCommandName, aArguments);

	User::LeaveIfError(err); // We don't have anything else to try, at this point.

	TUid uid2 = process.Type()[1];

	if (uid2 == KPipsExeUid && process.Type()[2].iUid != FSHELL_UID_PIPSRUN) // pipsrun itself appears to be a PIPS exe but needs to be treated as an fshell one

		{

		// (8) PIPS exe.

		// CPipsCommand can't make use of the process (because it needs to open it via popen3) so we still need to kill it in this case.

		KillAndCloseProcess(process);

		return CPipsCommand::NewL(aCommandName);

		}

	// (9) Process - either an fshell cmd (one which doesn't start fshell_) or a plain old non-fshell process.

	return CProcessCommand::NewL(aCommandName, process);

	}

void CCommandFactory::ListCommandsL(RArray<TPtrC>& aList)

	{

	CheckExternalCommands();

	WaitLC();

	const TInt numCommands = iCommands.Count();

	for (TInt i = 0; i < numCommands; ++i)

		{

		CCommandConstructorBase* constructor = iCommands[i];

		if (!(constructor->Attributes() & CCommandConstructorBase::EAttNotInHelp))

			{

			TInt err = aList.Append(TPtrC(iCommands[i]->CommandName()));

			if (err && (err != KErrAlreadyExists))

				{

				User::Leave(err);

				}

			}

		}

	CleanupStack::PopAndDestroy(); // WaitLC.

	}

TInt CCommandFactory::CountUniqueCommandsL()

	{

	CheckExternalCommands();

	WaitLC();

	TInt count = 0;

	const TInt numCommands = iCommands.Count();

	for (TInt i = 0; i < numCommands; ++i)

		{

		CCommandConstructorBase* constructor = iCommands[i];

		TUint attributes = constructor->Attributes();

		if (!(attributes & (CCommandConstructorBase::EAttNotInHelp | CCommandConstructorBase::EAttAlias)))

			{

			++count;

			}

		}

	CleanupStack::PopAndDestroy(); // WaitLC.

	return count;

	}

CCommandFactory::CCommandFactory(RFs& aFs)

	: CActive(CActive::EPriorityStandard), iFs(aFs)

#ifdef __WINS__

	, iFailedToScanFileSystem(ETrue)

#endif

	{

	CActiveScheduler::Add(this);

	}

void CCommandFactory::ConstructL()

	{

	User::LeaveIfError(iLock.CreateLocal());

	User::LeaveIfError(iFs.DriveList(iDriveList));

	AddThreadCommandL(CCmdExit::NewLC); // Note, this command should never execute as 'exit' has handled explicitly by CParser. It exists so that 'exit' appears in fshell's help list and also to support 'exit --help'.

	AddThreadCommandL(CCmdHelp::NewLC, CThreadCommand::ESharedHeap);

	AddThreadCommandL(CCmdCd::NewLC, CThreadCommand::EUpdateEnvironment);

	AddThreadCommandL(CCmdClear::NewLC);

	AddThreadCommandL(CCmdFg::NewLC, CThreadCommand::ESharedHeap);

	AddThreadCommandL(CCmdBg::NewLC, CThreadCommand::ESharedHeap);

	AddThreadCommandL(CCmdJobs::NewLC, CThreadCommand::ESharedHeap);

	AddThreadCommandL(CCmdExport::NewLC, CThreadCommand::EUpdateEnvironment);

	AddThreadCommandL(CCmdExists::NewLC);

	AddThreadCommandL(CCmdVar::NewLC, CThreadCommand::EUpdateEnvironment);

	AddThreadCommandL(CCmdReattach::NewLC, CThreadCommand::ESharedHeap);

	AddThreadCommandL(CCmdDisown::NewLC, CThreadCommand::ESharedHeap);

	AddThreadCommandL(CCmdSource::NewLC, CThreadCommand::EUpdateEnvironment);

	AddThreadCommandL(CCmdForEach::NewLC, CThreadCommand::EUpdateEnvironment);

	AddThreadCommandL(CCmdHello::NewLC);

	AddThreadCommandL(CCmdRm::NewLC);

	AddThreadCommandL(CCmdCp::NewLC);

	AddThreadCommandL(CCmdMv::NewLC);

	AddThreadCommandL(CCmdMkDir::NewLC);

	AddThreadCommandL(CCmdRmDir::NewLC);

	AddThreadCommandL(CCmdKill::NewLC);

	AddThreadCommandL(CCmdLs::NewLC);

	AddThreadCommandL(CCmdPs::NewLC);

	AddThreadCommandL(CCmdMatch::NewLC);

	AddThreadCommandL(CCmdEcho::NewLC);

	AddThreadCommandL(CCmdMore::NewLC);

	AddThreadCommandL(CCmdUndertaker::NewLC);

	AddThreadCommandL(CCmdFileUser::NewLC);

	AddThreadCommandL(CCmdTrace::NewLC);

	AddThreadCommandL(CCmdMemInfo::NewLC);

	AddThreadCommandL(CCmdGobble::NewLC);

	AddThreadCommandL(CCmdDump::NewLC);

	AddThreadCommandL(CCmdSleep::NewLC);

	AddThreadCommandL(CCmdEnv::NewLC);

	AddThreadCommandL(CCmdSort::NewLC);

	AddThreadCommandL(CCmdInfoPrint::NewLC);

	AddThreadCommandL(CCmdRDebug::NewLC);

	AddThreadCommandL(CCmdDate::NewLC);

	AddThreadCommandL(CCmdFsck::NewLC);

	AddThreadCommandL(CCmdDriver::NewLC);

	AddThreadCommandL(CCmdChunkInfo::NewLC);

	AddThreadCommandL(CCmdSvrInfo::NewLC);

	AddThreadCommandL(CCmdXmodem::NewLC);

	AddThreadCommandL(CCmdYmodem::NewLC);

	AddThreadCommandL(CCmdTickle::NewLC);

	AddThreadCommandL(CCmdTicks::NewLC);

	AddThreadCommandL(CCmdUpTime::NewLC);

	AddThreadCommandL(CCmdStart::NewLC);

	AddThreadCommandL(CCmdCompare::NewLC);

	AddThreadCommandL(CCmdTime::NewLC);

	AddThreadCommandL(CCmdRepeat::NewLC);

	AddThreadCommandL(CCmdDebug::NewLC);

	AddThreadCommandL(CCmdReadMem::NewLC);

	AddThreadCommandL(CCmdE32Header::NewLC);

	AddThreadCommandL(CCmdObjInfo::NewLC);

	AddThreadCommandL(CCmdVersion::NewLC);

	AddThreadCommandL(CCmdTouch::NewLC);

	AddThreadCommandL(CCmdDialog::NewLC);

	AddThreadCommandL(CCmdConsole::NewLC);

	AddThreadCommandL(CCmdPcons::NewLC);

	AddThreadCommandL(CCmdIoInfo::NewLC);

#ifdef __WINS__

	AddThreadCommandL(CCmdJit::NewLC);

#endif

	AddThreadCommandL(CCmdDebugPort::NewLC);

	AddThreadCommandL(CCmdRom::NewLC);

	AddThreadCommandL(CCmdWhich::NewLC, CThreadCommand::ESharedHeap);

	AddThreadCommandL(CCmdTee::NewLC);

	AddThreadCommandL(CCmdError::NewLC);

#ifdef FSHELL_CORE_SUPPORT_BUILTIN_REBOOT

	AddThreadCommandL(CCmdReboot::NewLC);

#endif

	// Add some DOS-style namings of common commands.

	AddThreadCommandL(_L("del"), CCmdRm::NewLC, CCommandConstructorBase::EAttAlias);

	AddThreadCommandL(_L("md"), CCmdMkDir::NewLC, CCommandConstructorBase::EAttAlias);

	AddThreadCommandL(_L("rd"), CCmdRmDir::NewLC, CCommandConstructorBase::EAttAlias);

	AddThreadCommandL(_L("copy"), CCmdCp::NewLC, CCommandConstructorBase::EAttAlias);

	AddThreadCommandL(_L("cls"), CCmdClear::NewLC, CCommandConstructorBase::EAttAlias);

	AddThreadCommandL(_L("move"), CCmdMv::NewLC, CCommandConstructorBase::EAttAlias);

	AddThreadCommandL(_L("ren"), CCmdMv::NewLC, CCommandConstructorBase::EAttAlias);

	_LIT(KDirArg, "-l");

	AddAliasCommandL(_L("dir"), CCmdLs::NewLC, &KDirArg, NULL, CCommandConstructorBase::EAttAlias);

	// Add aliases for drive letters so that "c:" is treated like "cd c:\".

	const TInt numDrives = iDriveList.Length();

	for (TInt i = 0; i < numDrives; ++i)

		{

		if (iDriveList[i] & KDriveAttLocal|KDriveAttRom)

			{

			TChar driveLetter;

			if (RFs::DriveToChar(i, driveLetter) == KErrNone)

				{

				driveLetter.LowerCase();

				TBuf<2> name;

				name.SetLength(2);

				name[0] = driveLetter;

				name[1] = ':';

				TBuf<3> dir(name);

				dir.Append(_L("\\"));

				AddAliasCommandL(name, CCmdCd::NewLC, NULL, &dir, CCommandConstructorBase::EAttNotInHelp | CCommandConstructorBase::EAttAlias, CThreadCommand::EUpdateEnvironment);

				}

			}

		}

	}

void CCommandFactory::WatchFileSystem()

	{

	if (!IsActive())

		{

		_LIT(KExecutableDir, "?:\\sys\\bin\\");

		iFs.NotifyChange(ENotifyAll, iStatus, KExecutableDir);

		SetActive();

		}

	}

void CCommandFactory::AddCommandL(CCommandConstructorBase* aCommandConstructor)

	{

	TInt err = iCommands.InsertInOrder(aCommandConstructor, TLinearOrder<CCommandConstructorBase>(CompareCommandNames));

	if (err == KErrAlreadyExists)

		{

		// Decide whether this command implementation should override what we already know about.

		// Note, the precedence should match that in CCommandFactory::CreateCommandL for the case where is wasn't possible

		// to scan the file system.

		// The order of precedence is:

		//

		// 1) Local commands (because if they get overridden, there is no way to access them - external commands can always be specified explicitly using a file extension).

		// 2) "fshell_" prefixed commands.

		// 3) EXE commands.

		ASSERT(aCommandConstructor->Attributes() & CCommandConstructorBase::EAttExternal); // Assert that local commands have a unique name.

		TInt pos = FindCommandL(aCommandConstructor->CommandName());

		ASSERT(pos >= 0);

		CCommandConstructorBase* existingCommand = iCommands[pos];

		TBool override(EFalse);

		if (existingCommand->Attributes() & CCommandConstructorBase::EAttExternal) 

			{

			// Existing is not a local command.

			CExeCommandConstructor* existingExeCommand = static_cast<CExeCommandConstructor*>(existingCommand); // Note, this cast assumes that ALL external commands are sub-classed from CExeCommandConstructor (which at the time of writing is true).

			if (existingExeCommand->ExeName().Left(KFshellPrefix().Length()).Compare(KFshellPrefix) != 0)

				{

				// Existing is not an "fshell_" prefixed command.

				if (static_cast<CExeCommandConstructor*>(aCommandConstructor)->ExeName().Left(KFshellPrefix().Length()).Compare(KFshellPrefix) == 0)

					{

					// aCommandConstructor is "fshell_" prefixed - allow it to override.

					override = ETrue;

					}

				}

			}

		if (override)

			{

			delete existingCommand;

			existingCommand = NULL;

			iCommands.Remove(pos);

			iCommands.Insert(aCommandConstructor, pos);

			}

		}

	else

		{

		User::LeaveIfError(err);

		}

	}

void CCommandFactory::AddThreadCommandL(TCommandConstructor aConstructor, TUint aFlags)

	{

	CCommandConstructorBase* constructor = CThreadCommandConstructor::NewLC(aConstructor, aFlags);

	AddCommandL(constructor);

	CleanupStack::Pop(constructor);

	}

void CCommandFactory::AddThreadCommandL(const TDesC& aCommandName, TCommandConstructor aConstructor, TUint aAttributes, TUint aFlags)

	{

	CCommandConstructorBase* constructor = CThreadCommandConstructor::NewLC(aCommandName, aConstructor, aFlags);

	constructor->SetAttributes(aAttributes);

	AddCommandL(constructor);

	CleanupStack::Pop(constructor);

	}

void CCommandFactory::AddAliasCommandL(const TDesC& aAliasName, TCommandConstructor aConstructor, const TDesC* aAdditionalArguments, const TDesC* aReplacementArguments, TUint aAttributes, TUint aFlags)

	{

	CCommandConstructorBase* aliasedCommand = CThreadCommandConstructor::NewLC(aConstructor, aFlags);

	CCommandConstructorBase* constructor = CAliasCommandConstructor::NewLC(aAliasName, aliasedCommand, aAdditionalArguments, aReplacementArguments);

	CleanupStack::Pop(2, aliasedCommand); // Now owned by "constructor".

	CleanupStack::PushL(constructor);

	constructor->SetAttributes(aAttributes);

	AddCommandL(constructor);

	CleanupStack::Pop(constructor);

	}

void CCommandFactory::CheckExternalCommands()

	{

	if (!iFailedToScanFileSystem && !iFileSystemScanned)

		{

		TRAPD(err, FindExternalCommandsL()); // Will fail with KErrPermissionDenied if we don't have TCB.

		if (err == KErrNone)

			{

			WatchFileSystem();

			}

		else

			{

			iFailedToScanFileSystem = ETrue;

			}

		}

	}

void CCommandFactory::FindExternalCommandsL()

	{

	WaitLC();

	// Remove any external commands that we already know about.

	TInt numCommands = iCommands.Count();

	for (TInt i = (numCommands - 1); i >= 0; --i)

		{

		CCommandConstructorBase* command = iCommands[i];

		if (command->Attributes() & CCommandConstructorBase::EAttExternal)

			{

			iCommands.Remove(i);

			}

		}

	_LIT(KExeExtension, ".exe");

	TUidType exeUids(KNullUid, KFshellExeUid, KNullUid);

	AppendExternalCommandsL(exeUids, KExeExtension);

	TUidType pipsUids(KNullUid, KPipsExeUid, KNullUid);

	AppendExternalCommandsL(pipsUids, KExeExtension);

	iFileSystemScanned = ETrue;

	CleanupStack::PopAndDestroy(); // WaitLC.

	}

void CCommandFactory::AppendExternalCommandsL(const TUidType& aUidType, const TDesC& aExtension)

	{

	//const TInt numDrives = iDriveList.Length();

	for (TInt drive = EDriveY; ; --drive)

		{

		if (drive == -1)

			{

			drive = EDriveZ;

			}

		TChar driveLetter;

		User::LeaveIfError(RFs::DriveToChar(drive, driveLetter));

		CDir* dir = NULL;

		TFileName dirName;

		dirName.Append(driveLetter);

		dirName.Append(':');

		dirName.Append(KExecutableDir);

		// Try getting the directory contents in one go

		TInt err = iFs.GetDir(dirName, aUidType, ESortByName, dir);

		if (err == KErrNone)

			{

			CleanupStack::PushL(dir);

			const TInt count = dir->Count();

			for (TInt i = 0; i < count; ++i)

				{

				DoAppendExternalCommandsL((*dir)[i], aUidType, aExtension);

				}

			CleanupStack::PopAndDestroy(dir);

			}

		else if (err == KErrNoMemory)

			{

			// If not enough memory to read dir in one go, iterate the RDir (slower but uses less memory)

			RDir d;

			TInt err = d.Open(iFs, dirName, aUidType);

			if (err == KErrNone)

				{

				CleanupClosePushL(d);

				TEntry entry;

				while (err == KErrNone)

					{

					err = d.Read(entry);

					if (err == KErrNone)