// UtilityConfig.hpp
//
// Copyright (C) 2011 ARM Research Labs, LLC.
// See www.armresearch.com for the copyright terms.
//
// This file defines the interface used by the configuration utilities.
//

#ifndef UtilityConfighpp_included
#define UtilityConfighpp_included

#include <string>

#include "SNFMulti.hpp"
#include "Utility.hpp"
#include "FileBackup.hpp"

/// Base class for the Sniffer configuration.
//
// This class provides capability common to the configuration applications.
//
//////////////////////////////////////////////////////////////////////////////////////////////////////////
class UtilityConfig : public Utility {

public:

    /// Enumeration describing the running status of the Sniffer application.
    enum SnifferRunningStatue {
	SnifferIsRunning, ///< OpenBSD OS.
	SnifferIsStopped, ///< FreeBSD OS.
	SnifferRunningStatusIsUknown ///< Ubuntu and variants.
    };

    /// Default constructor.
    UtilityConfig();

    /// Object to back up and restore files.
    FileBackup SaveFile;

    /// Set the config file name to the default if it wasn't specified.
    //
    // If the configuration file wasn't specified by
    // SetConfigFileName() on the command line, then this method sets
    // the config file to the default.  The default is the unique file
    // that exists in the specified list.  If more than one file in
    // the specified list exists, an exception is thrown.
    //
    // If the configuration file was specified by SetConfigFileName()
    // or on the command line, then this method does nothing.
    //
    // \param[in] DefaultFile is the list of default locations of the file.
    //
    // \param[in] NumDefaultFiles is the number of defaultlocations.
    //
    void CheckAndSetConfigFileName(const std::string DefaultFile[], int NumDefaultFiles);

    /// If the configuration file doesn't exist, create it from the
    /// sample file.
    //
    // This method creates the default configuration file if the
    // specified configuration file doesn't exist.
    //
    // The method CheckAndSetConfigFileName must be called before this
    // method.
    //
    // \param[in] SampleConfigFile is the name of the sample
    // configuration file.
    //
    void CreateDefaultConfigFile(std::string SampleConfigFile);

    /// If the identity file doesn't exist, create it from the sample
    /// file.
    //
    // This method creates the default identity file if the identity
    // file specified in the configuration file doesn't exist.
    //
    // The method CheckAndSetConfigFileName must be called before this
    // method.
    //
    // \param[in] SampleIdentityFile is the name of the sample
    // identity file.
    //
    void CreateDefaultIdentityFile(std::string SampleIdentityFile);

    /// Load the configuration from the file specified by SetConfigFileName.
    //
    void LoadConfig(void);

    /// Set the configuration file name.
    //
    // \param[in] Name is the name of the configuration file.
    //
    void SetConfigFileName(std::string Name);

    /// Get the configuration file name.
    //
    // \returns the name of the configuration file.
    //
    std::string GetConfigFileName(void);

    /// Get the contents of the <platform> element of the loaded
    /// config file.
    //
    // \returns the contents of the <platform> element.
    //
    string GetPlatformContents(void);

    /// Get the workspace path.
    //
    // \returns the workspace path.
    std::string GetWorkspacePath(void);

    /// Get the rulebase path.
    //
    // \returns the rulebase path.
    std::string GetRulebasePath(void);

    /// Get the log path.
    //
    // \returns the log path.
    std::string GetLogPath(void);

    /// Get the identity file name.
    //
    // \returns the identity file name.
    std::string GetIdentityFileName(void);

    /// Get the rulebase script file name.
    //
    // \returns the rulebase script file name.
    std::string GetRulebaseScriptName(void);

    /// Get the ignore list file name.
    //
    // \returns the ignore list file name.
    //
    std::string GetIgnoreListFileName(void);

    /// Return the rulebase file name.
    //
    // \returns the name of the rulebase file, including the path.
    //
    std::string GetRulebaseFileName();

    /// Get the operating system type.
    //
    // \returns the operating system type.  This is the value of
    // SNF_OSTYPE specified on the compile commandline.  For *nix, it
    // is identical to the value of the --enable-os-type command-line
    // input to ./configure:
    //
    // <ol>
    //  <li>OpenBSD</li>
    //  <li>FreeBSD</li>
    //  <li>Suse</li>
    //  <li>RedHat</li>
    //  <li>Ubuntu</li>
    // </ol>
    //
    std::string GetOperatingSystemType(void);

    /// Load the operating-system-dependent info (file locations, etc).
    //
    // This method updates the public members that contain the OS
    // specification and file paths.
    //
    void LoadInfo();

    /// Postfix main.cf file path.
    std::string PostfixMainCfPath;

    /// Postfix master.cf file path.
    std::string PostfixMasterCfPath;

    /// Directory containing the Sniffer start script.
    std::string SnifferStartScriptDir;

    /// Create or update the ignore list file.
    //
    // The ignore list file is created if it dosn't exist.  In any
    // case, the owner/group is changed by SetOwnerGroup(), and the
    // permissions are changed to readonly for everyone, and
    // read/write for the owner.
    void UpdateIgnoreListFile();

    /// Create or update the log directory.
    //
    // The log directory is created if it dosn't exist.  In any case,
    // the owner/group is changed by SetOwnerGroup(), and the
    // permissions are changed to r-x for everyone, and rwx for the
    // owner.
    void UpdateLogDir();

    /// Determine whether the credentials should be updated.
    //
    // This method determines whether the credentials should be
    // updated.  If the user specified both the License ID and
    // Authentication, then the credentials should be updated.
    //
    // \returns true if the credentials should be updated.
    //
    bool UpdateCredentialsSpecified();

    /// Create or update the rulebase script.
    //
    // If the rulebase script doesn't exist, this method creates the
    // rulebase script from the sample rulebase script.
    //
    // If the credentials were supplied, this method updates the
    // rulebase with the supplied credentials.
    //
    // In either case, the permissions of the rulebase script are
    // updated.
    //
    void CreateUpdateRulebaseScript();

    /// Download the rulebase.
    //
    void DownloadRulebase();

    /// Update the identity file.
    //
    // If the credentials were supplied, this method updates the
    // identity file with the supplied credentials.
    //
    // In any case, the owner/group is changed by SetOwnerGroup(), and
    // the permissions are changed to readonly for the owner.
    //
    // \pre Either the identity file must exist, or the credentials
    // must be supplied so that the identity file is created.
    //
    // \see SetOwnerGroup().
    //
    void UpdateIdentityFile(void);

    /// Start the sniffer.
    //
    // This method runs the specified sniffer start script in the
    // appropriate (i.e. OS-dependent) directory.  The script is
    // prepended with the directory, and run with an argument of
    // "start".
    //
    // \param[in] Script is the name of the start script.
    //
    // \pre LoadInfo() must have been called.  That method initializes
    // the directory the script resides in.
    //
    void StartSniffer(std::string Script);

    /// Process one command-line item.
    //
    // \param[in] OneInput is the command-line item to process.
    //
    bool ProcessCommandLineItem(std::string OneInput);

    /// Check whether the command-line parameters were specified
    /// correctly.
    //
    // This function check that either both the LicenseID and
    // Authentication were specified, or neither were.
    //
    // \returns if the command-line parameters were specified
    // correctly, false otherwise.
    bool CommandLineIsOkay();

    /// Output the legal command-line input.
    std::string HelpCommandLine();

    /// Output the description of the legal command-line input.
    std::string HelpDescription();

private:

    /// Update the credentials of an existing rulebase script.
    //
    // This method does the actual work of updating the credentials of
    // the rulebase script.
    //
    // \pre The rulebase script file must exist.
    //
    // Side effect:  The rulebase script is updated.
    //
    void UpdateRulebaseScriptCredentials();

    std::string ConfigFileName; ///< Configuration file name.
    bool ConfigFileExists; ///< True if the configuration file exists.
    std::string LicenseId; ///< License ID string.
    bool LicenseIdIsSpecified; ///< true if the License ID was specified on the command line.
    std::string Authentication; ///< Authentication string.
    bool AuthenticationIsSpecified; ///< true if the Authentication was specified on the command line.

    static const std::string RulebaseDownloadCommand; ///< Command to download the rulebase.
    static const std::string RulebaseDownloadStatusFile; ///< Status file for rulebase download status.

    static const std::string SampleIgnoreListFile; ///< Sample ignore list file.
    static const std::string SampleRulebaseScriptFile; ///< Sample rulebase script file.

    snfCFGData CFGData; ///< Configuration data.

    /// Operating system type.
    //
    // This is either Windows or the value specified for
    // --enable-os-type when configuring for *nix.
    static const std::string OperatingSystemType;
};

#endif