/*

* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

#include "sidcache.h"

#include "securitycheckutil.h"

#include "cleanuputils.h"

#include <s32file.h>

#include <e32uid.h>

#include <f32file.h>

#include "securityinfo.h"

namespace Swi 

	{

	_LIT(KSidCacheFileName, "sidcache.cache");

#ifdef SYMBIAN_UNIVERSAL_INSTALL_FRAMEWORK

	CSidCache* CSidCache::NewL(Usif::RStsSession& aStsSession)

#else

	CSidCache* CSidCache::NewL(CIntegrityServices& aIntegrityServices)

#endif

		{

#ifdef SYMBIAN_UNIVERSAL_INSTALL_FRAMEWORK

		CSidCache* self = CSidCache::NewLC(aStsSession);

#else

		CSidCache* self = CSidCache::NewLC(aIntegrityServices);

#endif

		CleanupStack::Pop(self);

		return self;

		}

#ifdef SYMBIAN_UNIVERSAL_INSTALL_FRAMEWORK

	CSidCache* CSidCache::NewLC(Usif::RStsSession& aStsSession)

#else

	CSidCache* CSidCache::NewLC(CIntegrityServices& aIntegrityServices)

#endif

		{

		CSidCache* self = new (ELeave) CSidCache;

		CleanupStack::PushL(self);

#ifdef SYMBIAN_UNIVERSAL_INSTALL_FRAMEWORK

		self->ConstructL(aStsSession);

#else

		self->ConstructL(aIntegrityServices);

#endif

		return self;

		}

#ifdef SYMBIAN_UNIVERSAL_INSTALL_FRAMEWORK

	void CSidCache::ConstructL(Usif::RStsSession& aStsSession)

#else

	void CSidCache::ConstructL(CIntegrityServices& aIntegrityServices)

#endif

		{

		RFs fs;

		User::LeaveIfError(fs.Connect());

		CleanupClosePushL(fs);

		iSystemDrive = RFs::GetSystemDrive();

		TChar driveChar;

		RFs::DriveToChar(iSystemDrive, driveChar);

		TUint systemDriveChar = driveChar;

		// Build the absolute file name of the SID cache

		_LIT(KSidCacheNameFormat, "%c:%S%S");		

		// 20 Max length ....Ex: Private\101F7295

		TBuf<20> privatePath;

		fs.PrivatePath(privatePath);

		//40 Max length ... Ex: C:\Private\101F7295\sidcache.cache

		TBuf<40> sidCacheFileName;

		sidCacheFileName.Format(KSidCacheNameFormat, systemDriveChar, &privatePath, &KSidCacheFileName); 

		RFile sidCacheFile;

		TInt err = sidCacheFile.Open(fs, sidCacheFileName, EFileStream|EFileRead);

		switch (err)

			{			

		case KErrNone:

			{

			// The file exists, so internalise it			

			CleanupClosePushL(sidCacheFile);

			RFileReadStream cacheReadStream(sidCacheFile);

			cacheReadStream.PushL();

			TRAP(err, InternalizeL(cacheReadStream));				

			CleanupStack::PopAndDestroy(2, &sidCacheFile);			

			if (err)

				{				

				// We failed to read the cache file. Delete it in case it is

				// corrupt

				RLoader loader;

				User::LeaveIfError(loader.Connect());

				CleanupClosePushL(loader);

				User::LeaveIfError(loader.Delete(sidCacheFileName));

				CleanupStack::PopAndDestroy(&loader);

				// Propogate the leave.

				User::Leave(err);				

				}

			break;

			}

		case KErrPathNotFound:

			// InstallServer's private directory does not exist

			User::LeaveIfError(fs.CreatePrivatePath(iSystemDrive));

			// fallthrough 

		case KErrNotFound:

			{

			// The cache file does not exist (This may be a fallthrough

			// from the state above)

			// Read the SIDs from the ROM /sys/bin directory

			ScanFileSystemL(fs);

			// Create the cache file and externalise the SIDs.

			// Add the file to STS, so we never

			// get a bad cache file on the device

#ifdef SYMBIAN_UNIVERSAL_INSTALL_FRAMEWORK

			aStsSession.RegisterNewL(sidCacheFileName);

#else

			aIntegrityServices.AddL(sidCacheFileName);

#endif

			User::LeaveIfError(sidCacheFile.Create(fs, sidCacheFileName, EFileStream|EFileWrite));

			CleanupClosePushL(sidCacheFile);

			RFileWriteStream cacheWriteStream(sidCacheFile);

			cacheWriteStream.PushL();

			ExternalizeL(cacheWriteStream);

			CleanupStack::PopAndDestroy(2, &sidCacheFile);

			break;

			}

		default:

			// Unexpected error opening cache file, leave

			User::LeaveIfError(err);

			break;

			}

		CleanupStack::PopAndDestroy(&fs);

		}

	void CSidCache::FindDirsL(RFs& aFs, RPointerArray<HBufC>& aSearchDirs)

		{								

		// Count() will increase if a subdirectory is encountered so don't 'optimise'

		// the loop invariant !				

		for (TInt i = 0; i < aSearchDirs.Count(); ++i) 

			{

			CDir* entries(0);

			CDir* subDirs(0);

			User::LeaveIfError(aFs.GetDir(*aSearchDirs[i], 

				KEntryAttMatchMask, 

				ESortByName, 

				entries,

				subDirs));

			delete entries;

			CleanupStack::PushL(subDirs);

			// Add all new directories to the directories to search								

			TInt subDirCount(subDirs->Count());		

			for (TInt j = 0; j < subDirCount; ++j)

				{

				const TEntry& entry = (*subDirs)[j];							

				TFileName name = *aSearchDirs[i];				

				name.Append(entry.iName);

				name.Append('\\');

				HBufC* tmpDirName = name.AllocLC();

				aSearchDirs.AppendL(tmpDirName);					

				CleanupStack::Pop(tmpDirName);

				}

			CleanupStack::PopAndDestroy(subDirs);

			}

		}

	void CSidCache::ScanFileSystemL(RFs& aFs)

		{		

		// Find all sub-directories of z:\sys\bin		

		RPointerArray<HBufC> searchDirs;		

		CleanupResetAndDestroyPushL(searchDirs);

		// Add the first (base) path to search

		_LIT(KOSExeBasePath, "z:\\sys\\bin\\");

		HBufC* osExeBasePath = KOSExeBasePath().AllocLC();

		searchDirs.AppendL(osExeBasePath);

		CleanupStack::Pop(osExeBasePath);	

		FindDirsL(aFs, searchDirs);

		TUidType exeFileFilter(KExecutableImageUid);		

		TInt numDirs(searchDirs.Count());

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

			{			

			CDir* dirContents(0);

			User::LeaveIfError(aFs.GetDir(*searchDirs[i], exeFileFilter, ESortByName, dirContents));

			CleanupStack::PushL(dirContents);

			TInt numFiles(dirContents->Count());

			for (TInt j = 0; j < numFiles; ++j)

				{								

				TFileName name(*searchDirs[i]);				

				const TEntry& entry = (*dirContents)[j];

				name.Append(entry.iName);				

				// Ignore any files that aren't valid exes

				TSecurityInfo info;

				TRAPD(err, SecurityInfo::RetrieveExecutableSecurityInfoL(aFs, name, info));

				if (err == KErrNone)

					{			

					TUid sid;

					sid.iUid = info.iSecureId.iId;

					iSidArray.AppendL(sid);			

					}

				}

			CleanupStack::PopAndDestroy(dirContents);

			}

		CleanupStack::PopAndDestroy(&searchDirs);

		}

	TBool CSidCache::IsCachedL(TUid& aSid)

		{

		TInt err = iSidArray.Find(aSid);

		if (err == KErrNotFound)

			{

			return EFalse;

			}

		else if (err < 0)

			{

			User::Leave(err);

			}

		return ETrue;

		}

	void CSidCache::ExternalizeL(RWriteStream& aStream)

		{

		TInt32 count(iSidArray.Count());

		aStream.WriteInt32L(count);

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

			{

			aStream.WriteInt32L(iSidArray[i].iUid);

			}

		aStream.CommitL();

		}

	void CSidCache::InternalizeL(RReadStream& aStream)

		{

		iSidArray.Reset();

		TInt32 count(aStream.ReadInt32L());

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

			{

			TUid sid;

			sid.iUid = aStream.ReadInt32L();

			iSidArray.AppendL(sid);

			}

		}

	CSidCache::~CSidCache()

		{

		iSidArray.Close();

		}

	}