// /file SNFMilterConfig.cpp
//
// Copyright (C) 2011, ARM Research Labs, LLC.
// See www.armresearch.com for the copyright terms.
//
// This file contains the functions for SNFMilterConfig.
//
// $Id$
//
///////////////////////////////////////////////////////////////////////////////////////////////////

#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

#include <exception>
#include <stdexcept>
#include <sstream>
#include <iostream>
#include <fstream>
#include <vector>
#include "SNFMilterConfig.hpp"

using namespace std;

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

// Initialize default configuration file path.
#ifdef WIN

//  Windows OS.
const std::string SNFMilterConfig::DefaultConfigFile("C:\\SNF\\SNFMilter.xml");
const std::string SNFMilterConfig::SampleConfigFile("C:\\SNF\\SNFMilter.xml.sample");
const std::string SNFMilterConfig::SampleIdentityFile("C:\\SNF\\identity.xml.sample");

#else

#ifdef DEFAULT_CONFIG_DIR
//  *nix, DEFAULT_CONFIG_DIR is specified on the compile command line.
const std::string SNFMilterConfig::DefaultConfigFile(DEFAULT_CONFIG_DIR "/snf-milter/SNFMilter.xml");
const std::string SNFMilterConfig::SampleConfigFile(DEFAULT_CONFIG_DIR "/snf-milter/SNFMilter.xml.sample");
const std::string SNFMilterConfig::SampleIdentityFile(DEFAULT_CONFIG_DIR "/snf-milter/identity.xml.sample");
#else
// Not Windows, and DEFAULT_CONFIG_DIR is not specified on the compile
// command line.  In this case, we don't know the default path for the
// configuration file.
const std::string SNFMilterConfig::DefaultConfigFile("");
const std::string SNFMilterConfig::SampleConfigFile("");
const std::string SNFMilterConfig::SampleIdentityFile("");
#endif

#endif

const string SNFMilterConfig::ApplicationName("SNFMilter");

const string IntegrateWithNoneKey("-mta=none");
const string IntegrateWithPostfixKey("-mta=postfix");
const string IntegrateWithSendmailKey("-mta=sendmail");

const string SnfMilterMainCfSearchString("Added by SNFMilterConfig");

const string SnfMilterMainCfIntegrationString("smtpd_milters = unix:/var/snf-milter/socket $smtpd_milters # Added by SNFMilterConfig");

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

void
SNFMilterConfig::DisplayHelp(std::string Version) {

    std::string ExclusiveCommands;
    std::string ExclusiveCommandsHelp;

    ExclusiveCommands  = IntegrateWithPostfixKey + " | ";
    ExclusiveCommands += IntegrateWithSendmailKey + " | ";
    ExclusiveCommands += IntegrateWithNoneKey;

    ExclusiveCommandsHelp  = "  -mta=postfix               Integrate with postfix and start/reload postfix\n";
    ExclusiveCommandsHelp += "  -mta=sendmail              Integrate with sendmail and start/reload sendmail\n";
    ExclusiveCommandsHelp += "  -mta=none                  Remove any integration with all supported MTAs\n";

    cout
      << Version << endl
      << "Copyright (C) 2012, ARM Research Labs, LLC (www.armresearch.com)\n\n"
      << "Usage:\n\n"
      << "SNFMilterConfig "
      << UtilityConfig::HelpCommandLine(ExclusiveCommands) << "\n\n"
      << "SNFMilterConfig "
      << UtilityConfig::HelpDescription(ExclusiveCommandsHelp) << "\n"
      << "If snf-config-file is not specified, then the following file is used if it exists:\n\n"
      << "  " << DefaultConfigFile << "\n\n"
      << "If snf-config-file is not specified and the above file doesn't exist, then it is\n"
      << "copied from the following file:\n\n"
      << "  " << SampleConfigFile << "\n\n"
      << "If integration with an MTA is specified, that MTA is started if it isn't running,\n"
      << "or the MTA's configuration is reloaded if it is running.\n\n";

};

bool
SNFMilterConfig::GetCommandLineInput(int argc, char* argv[]) {

    int i;
    int NumCommandsFound = 0;
    string OneInput;

    Command = NoCommand;                                                        // Default is to do nothing.

    for (i = 1; i < argc; i++) {                                                // Check each input.

        OneInput = argv[i];

	if (OneInput == IntegrateWithPostfixKey) {

            Command = IntegrateWithPostfixCommand;
	    NumCommandsFound++;

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

            Command = IntegrateWithSendmailCommand;
	    NumCommandsFound++;

        } else if (OneInput == IntegrateWithNoneKey) {

	    Command = IntegrateWithNoneCommand;
	    NumCommandsFound++;

        } else {

	    // Process command-line input by the base class.
	    if (!ProcessCommandLineItem(OneInput)) {

		Command = UnknownCommand;
                return false;                                                   // Illegal input.

	    }

        }

    }

    if (UpdateCredentialsSpecified()) {

	Command = UpdateCredentialsCommand;
	NumCommandsFound++;

    }

    if (SetupRepairSpecified()) {

	Command = SetupRepairCommand;
	NumCommandsFound++;

    }

    if (StartSnifferSpecified()) {

	Command = StartSnifferCommand;
	NumCommandsFound++;

    }

    if (StopSnifferSpecified()) {

	Command = StopSnifferCommand;
	NumCommandsFound++;

    }

    return (NumCommandsFound == 1);

}

void
SNFMilterConfig::ExecuteCommand() {

    switch (Command) {

    case SetupRepairCommand:

        CheckAndSetConfigFileName(DefaultConfigFile);                           // Load the config file name if not specified.
        CreateDefaultConfigFile(SampleConfigFile);                              // Create the file if it doesn't exist,
                                                                                // Set owner and mode in any case.
        LoadConfig();
        LoadInfo();                                                             // Load the file paths.
        LoadSocketInfo();                                                       // Load the socket path.

        SetupRepair(SampleIdentityFile);
	SetupRepairSocketDir();

        break;

    case UpdateCredentialsCommand:

        CheckAndSetConfigFileName(DefaultConfigFile);                           // Load the config file name if not specified.
        LoadConfig();
        LoadInfo();                                                             // Load the file paths.
        LoadSocketInfo();                                                       // Load the socket path.

        UpdateRulebaseScriptCredentials();

	DownloadRulebase();

	UpdateIdentityFile();

	break;

    case IntegrateWithPostfixCommand:

	break;

    case IntegrateWithSendmailCommand:

	break;

    case IntegrateWithNoneCommand:

	break;

    case StartSnifferCommand:

        CheckAndSetConfigFileName(DefaultConfigFile);
        LoadConfig();
        LoadInfo();
        LoadSocketInfo();

	StartSniffer("snf-milter start", ApplicationName);
	break;

    case StopSnifferCommand:

        CheckAndSetConfigFileName(DefaultConfigFile);
        LoadConfig();
        LoadInfo();
        LoadSocketInfo();

	StopSniffer("snf-milter stop", ApplicationName);
	break;

    default:

	break;

    }

}

void
SNFMilterConfig::LoadSocketInfo() {

    std::string MilterElement = GetPlatformContents();

    ConfigurationData PlatformConfig(MilterElement.c_str(), MilterElement.length());

    ConfigurationElement SocketReader("milter");

    SocketReader
      .Element("socket")
          .Attribute("path", SocketFileName)
      .End("socket")
      .End("milter");

    SocketReader.interpret(PlatformConfig);

}

void
SNFMilterConfig::SetupRepairSocketDir() {

    std::string SocketDir;

    std::string::size_type LastDirSepIndex = SocketFileName.rfind("/");

    SocketDir = ( (std::string::npos == LastDirSepIndex) ? SocketFileName : SocketFileName.substr(0, LastDirSepIndex));

    if (Verbose()) {

	cout << "Create the milter socket directory " << SocketDir << "...";

    }

    if (!Explain()) {

	if (!FileExists(SocketDir)) {

	    MkDir(SocketDir);

	}

	SetMode(SocketDir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IWGRP | S_IXGRP);
	SetOwnerGroup(SocketDir);

    }

    OutputVerboseEnd();

}

void
SNFMilterConfig::SaveFileState() {

    if (!Explain()) {

        SaveFile.CreateBackupFile(GetRulebaseScriptName());

	if (UpdateCredentialsSpecified()) {

	    SaveFile.CreateBackupFile(GetRulebaseFileName());

	}
        SaveFile.CreateBackupFile(GetIdentityFileName());
        SaveFile.CreateBackupFile(GetIgnoreListFileName());

    }

}

void
SNFMilterConfig::DoIntegrationCommand() {

    switch (Command) {

    case NoCommand:
	break;

    case IntegrateWithNoneCommand:
	UnintegrateWithAllExcept();
	break;

    case IntegrateWithPostfixCommand:
	UnintegrateWithAllExcept("postfix");
	Postfix.Integrate(&SaveFile);
	break;

    case IntegrateWithSendmailCommand:
	UnintegrateWithAllExcept("sendmail");
	//	Sendmail.Integrate(&SaveFile);
	break;

    default:

	{
	    ostringstream Temp;

	    Temp << "Internal error in SNFMilterConfig::DoIntegrationCommand:  Invalid value of command:  "
		 << Command;

	    throw runtime_error(Temp.str());

	}

    }

}

void
SNFMilterConfig::UnintegrateWithAllExcept(std::string Except) {

    if (Except != "postfix") {

	Postfix.Unintegrate(&SaveFile);

    }
#if 0
    if (Except != "sendmail") {

	Sendmail.Unintegrate(&SaveFile);

    }
#endif

}