// UtilityConfig.cpp
//
// Copyright (C) 2011, ARM Research Labs, LLC.
// See www.armresearch.com for the copyright terms.
//
// This file implements the common functionality for the configuration
// utilities.

#include <cerrno>
#include <cstring>
#include <unistd.h>
#include <pwd.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <stdexcept>
#include <sstream>
#include <iostream>
#include <fstream>
#include <vector>

#include "UtilityConfig.hpp"

using namespace std;

//////////////////////////////////////////////////////////////////////////////////////////////////////////
// Configuration. ////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////

// Initialize OS-dependent constants.
#ifdef WIN

//  Windows OS.
const std::string UtilityConfig::SampleIgnoreListFile("C:\\SNF\\GBUdbIgnoreList.txt.sample");

const std::string UtilityConfig::RulebaseDownloadCommand("FIX THIS");

const std::string UtilityConfig::RulebaseDownloadStatusFile("FIX THIS");

const std::string ScriptNameKey("FIX THIS"); ///< Text to replace with script name.
const std::string SnifferPathKey("FIX THIS"); ///< Text to replace with directory of the rulebase.

const std::string UtilityConfig::SampleRulebaseScriptFile("C:\\SNF\\getRulebase.sample");

const std::string UtilityConfig::OperatingSystemType("Windows");

#else

// *nix OS.

// SCRIPT is replaced with the full path of the script run,
// SNIFFER_PATH is replaced with the path of the rulebase.
const std::string UtilityConfig::RulebaseDownloadCommand
("(cd SNIFFER_PATH; touch UpdateReady.txt; chown snfuser UpdateReady.txt; su -m snfuser -c SCRIPT)");

const std::string ScriptNameKey("SCRIPT"); ///< Text to replace with script name.
const std::string SnifferPathKey("SNIFFER_PATH"); ///< Text to replace with directory of the rulebase.

// SNIFFER_PATH is replaced with the path of the rulebase.
const std::string UtilityConfig::RulebaseDownloadStatusFile("SNIFFER_PATH/getRulebase.status");

#ifdef DEFAULT_DATA_DIR
//  *nix, DEFAULT_DATA_DIR is specified on the compile command line.
const std::string UtilityConfig::SampleIgnoreListFile(DEFAULT_DATA_DIR "/GBUdbIgnoreList.txt.sample");
#else
// Not Windows, and DEFAULT_DATA_DIR is not specified on the compile
// command line.  In this case, we don't know the path for the sample
// ignore list file.
#error DEFAULT_DATA_DIR must be defined by -DDEFAULT_DATA_DIR="..." when compiling.
#endif

#ifdef SBIN_DIR
//  *nix, SBIN_DIR is specified on the compile command line.
const std::string UtilityConfig::SampleRulebaseScriptFile(SBIN_DIR "/getRulebase.sample");
#else
// Not Windows, and SBIN_DIR is not specified on the compile
// command line.  In this case, we don't know the path for the sample
// ignore list file.
#error SBIN_DIR must be defined by -DSBIN_DIR="..." when compiling.
#endif

#ifdef SNF_OSTYPE
//  *nix, SNF_OSTYPE is specified on the compile command line.
const std::string UtilityConfig::OperatingSystemType(SNF_OSTYPE);
#else
// Not Windows, and SNF_OSTYPE is not specified on the compile command
// line.  In this case, we don't know the operating system.
#error SNF_OSTYPE must be defined by -DSNF_OSTYPE="..." when compiling.
#endif

#endif

/// Verbose command-line input.
const string VerboseKey("-v");

/// Explain command-line input.
const string ExplainKey("-explain");

/// Help command-line input.
const string HelpKey("-h");

/// Configuration file command-line input.
const string ConfigFileKey("-config=");

/// License ID command-line input.
const string LicenseIdKey("-id=");

/// Authentication command-line input.
const string AuthenticationKey("-auth=");

/// String that indicates a successful rulebase download.
//
// This string must be in the last line of the getRulebase status
// file.  Note: The getRulebase status file is created by the
// getRulebase script, has the name getRulebase.status, and is in the
// same directory as the rulebase files.
const string SuccessKey("Success");

const string LicenseSearchString = "LICENSE_ID=";
const string AuthSearchString = "AUTHENTICATION=";

//////////////////////////////////////////////////////////////////////////////////////////////////////////
// End of configuration. /////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////////////////////

UtilityConfig::UtilityConfig() :
    LicenseIdIsSpecified(false), AuthenticationIsSpecified(false), ConfigFileExists(true)
{

    SetExplain(false);
    SetVerbose(false);
    SetHelp(false);

}    

void
UtilityConfig::CheckAndSetConfigFileName(const std::string DefaultFile[], int NumDefaultFiles) {

    string ProvisionalConfigFile = ConfigFileName;

    if (ProvisionalConfigFile.length() == 0) {

	int i;
	vector<string> FoundFile;

	for (i = 0; i < NumDefaultFiles; i++) {

	    if (!FileExists(DefaultFile[i])) {

                continue;                                                       // File doesn't exist.

	    }

	    FoundFile.push_back(DefaultFile[i]);                                // Update list of found files.
	    ProvisionalConfigFile = DefaultFile[i];                             // Found configuration file.

	}

	if (0 == FoundFile.size()) {                                            // No default file found.

	    if (NumDefaultFiles > 0) {

                ProvisionalConfigFile =  DefaultFile[0];                        // Use the first default file.
		ConfigFileExists = false;

            } else {                                                            // No default config file was specified.

		ostringstream Temp;

		Temp << "Internal error:  NumDefaultFiles <= 0 at " << __FILE__ << ":" << __LINE__;

		throw runtime_error(Temp.str());

	    }

        } else if (FoundFile.size() > 1) {                                      // Multiple default files found.

	    string Temp;

	    Temp = "Configuration file was not specified, and more than one default configuration file was found::\n\n";

	    for (i = 0; i < FoundFile.size(); i++) {

		Temp += "  ";
		Temp += FoundFile[i] + "\n";

	    }

	    throw runtime_error(Temp);

	} else {

            ConfigFileExists = true;                                            // Config file was found.

	}

    } else {

	ConfigFileExists = FileExists(ProvisionalConfigFile);

    }

    SetConfigFileName(ProvisionalConfigFile);

}

void
UtilityConfig::CreateDefaultConfigFile(std::string SampleConfigFile) {

    std::string File = GetConfigFileName();

    if (!ConfigFileExists) {

	// Create the config file.
        Copy(SampleConfigFile, File);

    }

}

void
UtilityConfig::CreateDefaultIdentityFile(std::string SampleIdentityFile) {

    std::string File = GetIdentityFileName();

    if (!FileExists(File)) {

	// Create the config file.
        Copy(SampleIdentityFile, File);

    }

}

void
UtilityConfig::LoadConfig() {

    if (Verbose()) {

	cout << "Using configuration file " << GetConfigFileName() << ".\n";

    }

    // Load the data.
    try {

	CFGData.initializeFromFile(GetConfigFileName().c_str());

    } catch(...) {

	string Temp;

	Temp = "Error reading configuration file " + GetConfigFileName();
	Temp += ".";
	throw runtime_error(Temp);

    }

    if ( (CFGData.paths_workspace_path.length() == 0) ||
	 (CFGData.paths_rulebase_path.length() == 0) || 
	 (CFGData.paths_log_path.length() == 0) || 
	 (CFGData.update_script_call.length() == 0) || 
	 (CFGData.node_identity.length() == 0) ) {

	string Temp;

	Temp = "The configuration file " + GetConfigFileName();
	Temp += " did not have the necessary specification of one or more paths:\n";
	Temp += "\n  Workspace path:  " + CFGData.paths_workspace_path;
	Temp += "\n  Rulebase path:  " + CFGData.paths_rulebase_path;
	Temp += "\n  Log path:  " + CFGData.paths_log_path;
	Temp += "\n  Update script:  " + CFGData.update_script_call;
	Temp += "\n  Identity file:  " + CFGData.node_identity;
	throw runtime_error(Temp);

    }

}

string
UtilityConfig::GetPlatformContents(void) {

    return CFGData.PlatformElementContents;

}

string
UtilityConfig::GetConfigFileName(void) {

    return ConfigFileName;

}

void
UtilityConfig::SetConfigFileName(string Name) {

    ConfigFileName = Name;

}

string
UtilityConfig::GetWorkspacePath(void) {

    return CFGData.paths_workspace_path;

}

string
UtilityConfig::GetRulebasePath(void) {

    return CFGData.paths_rulebase_path;

}

string
UtilityConfig::GetLogPath(void) {

    return CFGData.paths_log_path;

}

string
UtilityConfig::GetIdentityFileName(void) {

    return CFGData.node_identity;

}

string
UtilityConfig::GetRulebaseScriptName(void) {

    return CFGData.update_script_call;

}

string
UtilityConfig::GetIgnoreListFileName(void) {

    return GetWorkspacePath() + "GBUdbIgnoreList.txt";

}

string
UtilityConfig::GetRulebaseFileName(void) {

    std::string Name;

    Name = GetRulebasePath();
    Name += LicenseId + ".snf";

    return Name;

}

string
UtilityConfig::GetOperatingSystemType(void) {

    return OperatingSystemType;

}

void
UtilityConfig::LoadInfo(){

    if ("OpenBSD" == OperatingSystemType) {

	PostfixMainCfPath = "/usr/local/etc/postfix/main.cf";
	PostfixMasterCfPath = "/usr/local/etc/postfix/master.cf";

    } else if ("FreeBSD" == OperatingSystemType) {

	PostfixMainCfPath = "/etc/postfix/main.cf";
	PostfixMasterCfPath = "/etc/postfix/master.cf";

    } else if ("Ubuntu" == OperatingSystemType) {

	PostfixMainCfPath = "/etc/postfix/main.cf";
	PostfixMasterCfPath = "/etc/postfix/master.cf";

    } else if ("RedHat" == OperatingSystemType) {

	PostfixMainCfPath = "/etc/postfix/main.cf";
	PostfixMasterCfPath = "/etc/postfix/master.cf";

    } else if ("Suse" == OperatingSystemType) {

	PostfixMainCfPath = "/etc/postfix/main.cf";
	PostfixMasterCfPath = "/etc/postfix/master.cf";

    } else {

	ostringstream Temp;

	Temp << "Internal error in UtilityConfig::LoadInfo:  Invalid value of OperatingSystemType:  "
	     << OperatingSystemType;

	throw runtime_error(Temp.str());

    }

}

void
UtilityConfig::UpdateIgnoreListFile() {

    string IgnoreListFile = GetIgnoreListFileName();

    if (!FileExists(IgnoreListFile)) {

        Copy(SampleIgnoreListFile, IgnoreListFile);

    }

    SetMode(IgnoreListFile, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);	        // Set permissions.
    SetOwnerGroup(IgnoreListFile);                                 	        // Set to sniffer user.

}

void
UtilityConfig::UpdateLogDir() {

    string LogDir = GetLogPath();

    if (!FileExists(LogDir)) {

        MkDir(LogDir);

    }

    SetMode(LogDir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
    SetOwnerGroup(LogDir);

}

bool
UtilityConfig::UpdateCredentialsSpecified() {

    return ( (LicenseId.length() > 0) && (Authentication.length() > 0) );

}


void
UtilityConfig::CreateUpdateRulebaseScript() {

    std::string File = GetRulebaseScriptName();

    if (!FileExists(File)) {

        Copy(SampleRulebaseScriptFile, File);                                   // Copy if !Explain().

    }

    if (UpdateCredentialsSpecified()) {

	UpdateRulebaseScriptCredentials();

    }

    SetMode(File, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); // Set permissions.

}

void
UtilityConfig::UpdateRulebaseScriptCredentials() {

    std::string File = GetRulebaseScriptName();

    if (Verbose()) {

	cout << "Update authentication and license ID in the rulebase download script file " << File << "--\n";

    }

    ifstream Input;

    Input.open(File.c_str());                                                   // Read the contents.
    if (!Input) {
	string Temp;

	Temp = "Error opening rulebase download script file " + File;
	Temp += " for reading:  ";
	Temp += strerror(errno);
	throw runtime_error(Temp);
    }

    string Content;
    string Line;
    bool FoundLicense = false;
    bool FoundAuth = false;

    while (getline(Input, Line)) {

	if (CheckForString(Line, LicenseSearchString)) {                        // Check for license line.

	    if (FoundLicense) {                                                 // Second license line found?
		string Temp;

		Temp = "Rulebase sownload script file " + File;
		Temp += " has the wrong format:  Found two lines beginning with " + LicenseSearchString;
		throw runtime_error(Temp);

	    }

	    if (Verbose()) {

		cout << "  Modify line:  '" << Line << "'...\n";

	    }
	    FoundLicense = true;
	    Line = LicenseSearchString + LicenseId;                             // Add license line.
	    Line += " # Added by SNFSetup";

	}

	if (CheckForString(Line, AuthSearchString)) {                           // Check for authentication line.

	    if (FoundAuth) {                                                    // Second authentication line found?
		string Temp;

		Temp = "Rulebase download script file " + File;
		Temp += " has the wrong format:  Found two lines beginning with " + AuthSearchString;
		throw runtime_error(Temp);
	    }

	    if (Verbose()) {

		cout << "  Modify line:  '" << Line << "'...\n";

	    }
	    FoundAuth = true;
	    Line = AuthSearchString + Authentication;                           // Add authentication line.
	    Line += " # Added by SNFSetup";

	}

	Content += Line + "\n";

    }

    if (!FoundLicense || !FoundAuth) {
	string Temp;

	Temp = "Rulebase download script file " + File;
	Temp += " has the wrong format:  Missing required line beginning with '" + LicenseSearchString;
	Temp += "' or '" + AuthSearchString;
	Temp += "'";
	throw runtime_error(Temp);
    }

    if (!Input.eof()) {                                                         // Should be at end-of-file.
	string Temp;

	Temp = "Error reading the rulebase download script file " + File;
	Temp += ":  ";
	Temp += strerror(errno);
	throw runtime_error(Temp);
    }

    Input.close();
    if (Input.bad()) {
	string Temp;

	Temp = "Error closing the rulebase download script file " + File;
	Temp += " after reading:  ";
	Temp += strerror(errno);
	throw runtime_error(Temp);
    }


    if (!Explain()) {

	ofstream Output;                                                            // Write the updated contents.

	Output.open(File.c_str(), ios::trunc);
	if (!Output) {
	    string Temp;

	    Temp = "Error opening rulebase download script file " + File;
	    Temp += " for writing:  ";
	    Temp += strerror(errno);
	    throw runtime_error(Temp);
	}

	Output << Content;
	if (!Output) {
	    string Temp;

	    Temp = "Error writing the rulebase download script file " + File;
	    Temp += ":  ";
	    Temp += strerror(errno);
	    throw runtime_error(Temp);
	}

	Output.close();
	if (!Output) {
	    string Temp;

	    Temp = "Error closing the rulebase download script file " + File;
	    Temp += " after writing:  ";
	    Temp += strerror(errno);
	    throw runtime_error(Temp);
	}

    }

    OutputVerboseEnd();

}

void
UtilityConfig::DownloadRulebase() {

    if (!UpdateCredentialsSpecified()) {

	return;

    }

    if (Verbose()) {

	std::cout << "Downloading the rulebase...";
	std::cout.flush();

    }

    std::string Command;

    Command = RulebaseDownloadCommand;

    std::string::size_type ScriptIndex = Command.find(ScriptNameKey);

    if (ScriptIndex != std::string::npos) {                                     // Insert script full path?

	Command.replace(ScriptIndex, ScriptNameKey.length(), GetRulebaseScriptName());

    }

    std::string::size_type SnifferPathIndex = Command.find(SnifferPathKey);

    if (SnifferPathIndex != std::string::npos) {                                // Insert rulebase location?

	Command.replace(SnifferPathIndex, SnifferPathKey.length(), GetRulebasePath());

    }

    std::string StatusFile;                                                     // Construct download status file name.

    StatusFile = RulebaseDownloadStatusFile;

    SnifferPathIndex = StatusFile.find(SnifferPathKey);

    if (SnifferPathIndex != std::string::npos) {                                // Insert rulebase location?

	StatusFile.replace(SnifferPathIndex, SnifferPathKey.length(), GetRulebasePath());

    }

    if (!Explain()) {

        if (0 != remove(StatusFile.c_str())) {                                  // Delete the status file.

            if (ENOENT != errno) {                                              // No error if the file doesn't exist.
		std::ostringstream Temp;

		Temp << "Unable to remove rulebase download status file " << StatusFile
		     << ":  " << strerror(errno) << "\n";

		throw runtime_error(Temp.str());

	    }

	}

        if (std::system(Command.c_str()) != 0) {                                // Download the rulebase.
	    string Temp;

	    Temp = "Error running the command '" + Command;
	    Temp += "'.";
	    throw runtime_error(Temp);

	}

	ifstream Input;

        Input.open(StatusFile.c_str());                                         // Check the status.
	if (!Input) {
	    string Temp;

	    Temp = "Error opening rulebase download scriptstatus file " + StatusFile;
	    Temp += ":  ";
	    Temp += strerror(errno);
	    throw runtime_error(Temp);
	}

	string Line;
	string PrevLine;
	string Content;

        while (getline(Input, Line)) {                                          // Read the last line.

	    PrevLine = Line;
	    Content += Line + "\n";

	}

        if (PrevLine.find(SuccessKey) == std::string::npos) {                   // Check the status.
	    string Temp;

	    Temp = "Error downloading the rulebase.  Rulebase download status:\n\n" + Content;
	    throw runtime_error(Temp);

	}

    }

    OutputVerboseEnd();

}

void
UtilityConfig::UpdateIdentityFile() {

    std::string File = GetIdentityFileName();

    if (UpdateCredentialsSpecified()) {

	ofstream Output;

	if (Verbose()) {

	    cout << "Create identity file " << File << "...";

	}

	if (!Explain()) {

	    Output.open(File.c_str());
	    if (!Output) {
		string Temp;

		Temp = "Error opening identity file " + File;
		Temp += ":  ";
		Temp += strerror(errno);
		throw runtime_error(Temp);
	    }

	    Output << "<!-- License file created by SNFIdentity-->\n"
		   << "<snf>\n"
		   << "    <identity licenseid='" << LicenseId << "' authentication='"
		   << Authentication << "'/>\n"
		   << "</snf>\n";
	    if (!Output) {
		string Temp;

		Temp = "Error writing identity file " + File;
		Temp += ":  ";
		Temp += strerror(errno);
		throw runtime_error(Temp);
	    }

	    Output.close();
	    if (!Output) {
		string Temp;

		Temp = "Error closing identity file " + File;
		Temp += ":  ";
		Temp += strerror(errno);
		throw runtime_error(Temp);
	    }

	}

	OutputVerboseEnd();

    }

    SetOwnerGroup(File);                                                        // Set the user and group.

    SetMode(File, S_IRUSR);                                                     // Set to readonly by owner.
}

bool 
UtilityConfig::ProcessCommandLineItem(std::string OneInput) {

    bool ValidCommand = true;
    std::string TempString;

    if (OneInput == VerboseKey) {

	SetVerbose(true);

    } else if (OneInput == ExplainKey) {

	SetExplain(true);

    } else if (OneInput == HelpKey) {

	SetHelp(true);

    } else if (OneInput == ConfigFileKey) {

	SetConfigFileName(OneInput.substr(ConfigFileKey.length()));

    } else if (0 == OneInput.find(LicenseIdKey)) {

        TempString = Trim(OneInput.substr(LicenseIdKey.length()));               // Copy only if not null after trimming.
	if (!TempString.empty()) {

	    LicenseId = TempString;
	    LicenseIdIsSpecified = true;

	} else {

	    ValidCommand = false;

	}

    } else if (0 == OneInput.find(AuthenticationKey)) {

	Authentication = Trim(OneInput.substr(AuthenticationKey.length()));
	AuthenticationIsSpecified = true;

    } else {

	ValidCommand = false;

    }

    return ValidCommand;

}

bool
UtilityConfig::CommandLineIsOkay() {

    return (AuthenticationIsSpecified == LicenseIdIsSpecified);

}

std::string
UtilityConfig::HelpCommandLine() {

    std::string Help;

    Help  = "[" + ConfigFileKey + "snf-config-file] ";
    Help += "[" + LicenseIdKey + "licenseid " + AuthenticationKey + "authentication] ";
    Help += "[ " + VerboseKey + " " + ExplainKey + " ]";

    return Help;

}

std::string
UtilityConfig::HelpDescription() {

    std::string Desc;

    Desc  = "  -config=snf-config-file    Specifies the configuration file\n";
    Desc += "  -id=licenseid              Specifies the license ID\n";
    Desc += "  -auth=authentication       Specifies the Authentication\n";
    Desc += "  -v                         Provide verbose output\n";
    Desc += "  -explain                   Provide an explaination of the actions\n";
    Desc += "                             without executing any commands\n";

    return Desc;

}