//
// $Id: FileMd5Probe.cpp,v 1.6 2007/01/09 17:43:02 bakerj Exp $
//
//****************************************************************************************//
// Copyright (c) 2002-2007, The MITRE Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright notice, this list
//       of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright notice, this 
//       list of conditions and the following disclaimer in the documentation and/or other
//       materials provided with the distribution.
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//       used to endorse or promote products derived from this software without specific 
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// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//****************************************************************************************//

#include "FileMd5Probe.h"

//****************************************************************************************//
//								FileMd5Probe Class										  //	
//****************************************************************************************//
FileMd5Probe* FileMd5Probe::instance = NULL;

FileMd5Probe::FileMd5Probe() {
	// -----------------------------------------------------------------------
	//
	//  ABSTRACT
	//
	//	Note that this is a private constructor
	// -----------------------------------------------------------------------

}

FileMd5Probe::~FileMd5Probe() {
	// -----------------------------------------------------------------------
	//
	//  ABSTRACT
	//
	//	Do nothing for now
	// -----------------------------------------------------------------------

}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  Public Members  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
AbsProbe* FileMd5Probe::Instance() {

	// -----------------------------------------------------------------------
	//
	//  ABSTRACT
	//
	//	Ensure that the FileMd5Probe is a singleton.
	// -----------------------------------------------------------------------

	// Use lazy initialization
	if(instance == NULL) 
		instance = new FileMd5Probe();

	return instance;	
}

ItemVector* FileMd5Probe::CollectItems(Object* object) {
	// -----------------------------------------------------------------------
	//
	//  ABSTRACT
	//
	//	Get all the files on the system that match the pattern. 
	//
	// -----------------------------------------------------------------------

	ItemVector *collectedItems = new ItemVector();

	// get the path and file name
	ObjectEntity* path = object->GetElementByName("path");
	ObjectEntity* fileName = object->GetElementByName("filename");

	FileFinder fileFinder;
	StringPairVector* filePaths = fileFinder.SearchFiles(path, fileName, object->GetBehaviors());

	// Loop through all file paths
	while(filePaths->size() > 0) {
		StringPair* fp = filePaths->at(filePaths->size()-1);
		filePaths->pop_back();
		Item* item = this->GetMd5(fp->first, fp->second);
		if(item != NULL) {
			collectedItems->push_back(item);
		}
		item = NULL;

		delete fp;
	}

	return collectedItems;
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  Private Members  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
Item* FileMd5Probe::CreateItem() {
	// -----------------------------------------------------------------------
	//
	//  ABSTRACT
	//
	//  Return a new Item created for storing file information
	//
	// -----------------------------------------------------------------------

	Item* item = new Item(0, 
						"http://oval.mitre.org/XMLSchema/oval-system-characteristics-5#independent", 
						"ind-sc", 
						"http://oval.mitre.org/XMLSchema/oval-system-characteristics-5#independent independent-system-characteristics-schema.xsd", 
						OvalEnum::ERROR_STATUS, 
						"filemd5_item");

	return item;
}

Item* FileMd5Probe::GetMd5(string path, string fileName) {
	// -----------------------------------------------------------------------
	//
	//  ABSTRACT
	//
	//	Get all attributes for the file specified in fileIn..Return them in a 
	//	FileAttribute
	// -----------------------------------------------------------------------

	string errorMessage = "";
	Item *item = NULL;
	string filePath = path;
	if(path[path.length()-1] != Common::fileSeperator)
		filePath.append(1, Common::fileSeperator);

	if(fileName[0] != Common::fileSeperator) {
		filePath.append(fileName);
	} else {
		filePath.append(fileName.substr(1, fileName.length()-2));
	}


	try {

		//////////////////////////////////////////////////////
		////////////////////////  MD5  ///////////////////////
		//////////////////////////////////////////////////////

		char buf[1024];
		FILE* fp = NULL;
		fp = fopen(filePath.c_str(), "r");
		if (fp == NULL) {
			/*
			errorMessage.append("(FileMd5Probe) Unable to get MD5 information for the file '");
			errorMessage.append(filePath);
			errorMessage.append("' \n");
			*/
		
		} else {
			// Create the md5 hash.  This constructor creates a new md5 object, updates the hash,
			// finalizes the hash, and closes the FILE object.
			
			MD5 context(fp);

			memset(buf, '\0', sizeof(buf));
			SNPRINTF(buf, sizeof(buf)-1, "%s", context.hex_digest());
			buf[sizeof(buf)-1] = '\0';
			item = this->CreateItem();
			item->SetStatus(OvalEnum::EXISTS_STATUS);
			item->AppendElement(new ItemEntity("path", path, OvalEnum::STRING_TYPE, true, OvalEnum::EXISTS_STATUS));
			item->AppendElement(new ItemEntity("filename", fileName, OvalEnum::STRING_TYPE, true, OvalEnum::EXISTS_STATUS));
			item->AppendElement(new ItemEntity("md5", buf, OvalEnum::STRING_TYPE, false, OvalEnum::EXISTS_STATUS));
		}

		//////////////////////////////////////////////////////
		//////////////////////////////////////////////////////
	} catch(ProbeException ex) {	
	
		Log::Debug(ex.GetErrorMessage());

	} catch(...) {	
	
		string errMsg = "";
		errMsg.append("(FileMd5Probe) Unknown error attempting to get file attribute information for the file '");
		errMsg.append(filePath);
		errMsg.append("'");
		Log::Debug(errMsg);		
	}

	return item;
}
