IRCConnector.cs

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/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 *       notice, this list of conditions and the following disclaimer.
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 *       derived from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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using System;
using System.Timers;
using System.Collections.Generic;
using System.IO;
using System.Net.Sockets;
using System.Reflection;
using System.Text.RegularExpressions;
using System.Threading;
using OpenMetaverse;
using log4net;
using Nini.Config;
using OpenSim.Framework;
using OpenSim.Framework.Monitoring;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;

namespace OpenSim.Region.OptionalModules.Avatar.Chat
{
    public class IRCConnector
    {

        #region Global (static) state

        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        // Local constants

        // This computation is not the real region center if the region is larger than 256.
        //     This computation isn't fixed because there is not a handle back to the region.
        private static readonly Vector3 CenterOfRegion = new Vector3(((int)Constants.RegionSize * 0.5f), ((int)Constants.RegionSize * 0.5f), 20);
        private static readonly char[] CS_SPACE = { ' ' };

        private const int WD_INTERVAL = 1000;     // base watchdog interval
        private static int PING_PERIOD = 15;       // WD intervals per PING
        private static int ICCD_PERIOD = 10;       // WD intervals between Connects
        private static int L_TIMEOUT = 25;       // Login time out interval

        private static int _idk_ = 0;        // core connector identifier
        private static int _pdk_ = 0;        // ping interval counter
        private static int _icc_ = ICCD_PERIOD; // IRC connect counter

        // List of configured connectors

        private static List<IRCConnector> m_connectors = new List<IRCConnector>();

        // Watchdog state

        private static System.Timers.Timer m_watchdog = null;

        // The watch-dog gets started as soon as the class is instantiated, and
        // ticks once every second (WD_INTERVAL)

        static IRCConnector()
        {
            m_log.DebugFormat("[IRC-Connector]: Static initialization started");
            m_watchdog = new System.Timers.Timer(WD_INTERVAL);
            m_watchdog.Elapsed += new ElapsedEventHandler(WatchdogHandler);
            m_watchdog.AutoReset = true;
            m_watchdog.Start();
            m_log.DebugFormat("[IRC-Connector]: Static initialization complete");
        }

        #endregion

        #region Instance state

        // Connector identity

        internal int idn = _idk_++;

        // How many regions depend upon this connection
        // This count is updated by the ChannelState object and reflects the sum
        // of the region clients associated with the set of associated channel 
        // state instances. That's why it cannot be managed here.

        internal int depends = 0;

        // This variable counts the number of resets that have been performed
        // on the connector. When a listener thread terminates, it checks to 
        // see of the reset count has changed before it schedules another 
        // reset.

        internal int m_resetk = 0;

        private Object msyncConnect = new Object();

        internal bool m_randomizeNick = true; // add random suffix
        internal string m_baseNick = null;      // base name for randomizing
        internal string m_nick = null;          // effective nickname

        public string Nick                        // Public property
        {
            get { return m_nick; }
            set { m_nick = value; }
        }

        private bool m_enabled = false;            // connector enablement
        public bool Enabled
        {
            get { return m_enabled; }
        }

        private bool m_connected = false;        // connection status
        private bool m_pending = false;        // login disposition
        private int m_timeout = L_TIMEOUT;    // login timeout counter
        public bool Connected
        {
            get { return m_connected; }
        }

        private string m_ircChannel;            // associated channel id
        public string IrcChannel
        {
            get { return m_ircChannel; }
            set { m_ircChannel = value; }
        }

        private uint m_port = 6667;                // session port
        public uint Port
        {
            get { return m_port; }
            set { m_port = value; }
        }

        private string m_server = null;            // IRC server name
        public string Server
        {
            get { return m_server; }
            set { m_server = value; }
        }
        private string m_password = null;
        public string Password
        {
            get { return m_password; }
            set { m_password = value; }
        }

        private string m_user = "USER OpenSimBot 8 * :I'm an OpenSim to IRC bot";
        public string User
        {
            get { return m_user; }
        }

        // Network interface

        private TcpClient m_tcp;
        private NetworkStream m_stream = null;
        private StreamReader m_reader;
        private StreamWriter m_writer;

        // Channel characteristic info (if available)

        internal string usermod = String.Empty;
        internal string chanmod = String.Empty;
        internal string version = String.Empty;
        internal bool motd = false;

        #endregion

        #region connector instance management

        internal IRCConnector(ChannelState cs)
        {

            // Prepare network interface

            m_tcp = null;
            m_writer = null;
            m_reader = null;

            // Setup IRC session parameters

            m_server = cs.Server;
            m_password = cs.Password;
            m_baseNick = cs.BaseNickname;
            m_randomizeNick = cs.RandomizeNickname;
            m_ircChannel = cs.IrcChannel;
            m_port = cs.Port;
            m_user = cs.User;

            if (m_watchdog == null)
            {
                // Non-differentiating

                ICCD_PERIOD = cs.ConnectDelay;
                PING_PERIOD = cs.PingDelay;

                // Smaller values are not reasonable

                if (ICCD_PERIOD < 5)
                    ICCD_PERIOD = 5;

                if (PING_PERIOD < 5)
                    PING_PERIOD = 5;

                _icc_ = ICCD_PERIOD;    // get started right away!

            }

            // The last line of defense

            if (m_server == null || m_baseNick == null || m_ircChannel == null || m_user == null)
                throw new Exception("Invalid connector configuration");

            // Generate an initial nickname

            if (m_randomizeNick)
                m_nick = m_baseNick + Util.RandomClass.Next(1, 99);
            else
                m_nick = m_baseNick;

            m_log.InfoFormat("[IRC-Connector-{0}]: Initialization complete", idn);

        }

        ~IRCConnector()
        {
            m_watchdog.Stop();
            Close();
        }

        // Mark the connector as connectable. Harmless if already enabled.

        public void Open()
        {
            if (!m_enabled)
            {

                if (!Connected)
                {
                    Connect();
                }

                lock (m_connectors)
                    m_connectors.Add(this);

                m_enabled = true;

            }
        }

        // Only close the connector if the dependency count is zero.

        public void Close()
        {

            m_log.InfoFormat("[IRC-Connector-{0}] Closing", idn);

            lock (msyncConnect)
            {

                if ((depends == 0) && Enabled)
                {

                    m_enabled = false;

                    if (Connected)
                    {
                        m_log.DebugFormat("[IRC-Connector-{0}] Closing interface", idn);

                        // Cleanup the IRC session

                        try
                        {
                            m_writer.WriteLine(String.Format("QUIT :{0} to {1} wormhole to {2} closing",
                                m_nick, m_ircChannel, m_server));
                            m_writer.Flush();
                        }
                        catch (Exception) { }


                        m_connected = false;

                        try { m_writer.Close(); }
                        catch (Exception) { }
                        try { m_reader.Close(); }
                        catch (Exception) { }
                        try { m_stream.Close(); }
                        catch (Exception) { }
                        try { m_tcp.Close(); }
                        catch (Exception) { }

                    }

                    lock (m_connectors)
                        m_connectors.Remove(this);

                }
            }

            m_log.InfoFormat("[IRC-Connector-{0}] Closed", idn);

        }

        #endregion

        #region session management

        // Connect to the IRC server. A connector should always be connected, once enabled

        public void Connect()
        {

            if (!m_enabled)
                return;

            // Delay until next WD cycle if this is too close to the last start attempt

            while (_icc_ < ICCD_PERIOD)
                return;

            m_log.DebugFormat("[IRC-Connector-{0}]: Connection request for {1} on {2}:{3}", idn, m_nick, m_server, m_ircChannel);

            lock (msyncConnect)
            {

                _icc_ = 0;

                try
                {

                    if (m_connected) return;

                    m_connected = true;
                    m_pending = true;
                    m_timeout = L_TIMEOUT;

                    m_tcp = new TcpClient(m_server, (int)m_port);
                    m_stream = m_tcp.GetStream();
                    m_reader = new StreamReader(m_stream);
                    m_writer = new StreamWriter(m_stream);

                    m_log.InfoFormat("[IRC-Connector-{0}]: Connected to {1}:{2}", idn, m_server, m_port);

                    WorkManager.StartThread(ListenerRun, "IRCConnectionListenerThread", ThreadPriority.Normal, true, false);

                    // This is the message order recommended by RFC 2812
                    if (m_password != null)
                        m_writer.WriteLine(String.Format("PASS {0}", m_password));
                    m_writer.WriteLine(String.Format("NICK {0}", m_nick));
                    m_writer.Flush();
                    m_writer.WriteLine(m_user);
                    m_writer.Flush();
                }
                catch (Exception e)
                {
                    m_log.ErrorFormat("[IRC-Connector-{0}] cannot connect {1} to {2}:{3}: {4}",
                                      idn, m_nick, m_server, m_port, e.Message);
                    // It might seem reasonable to reset connected and pending status here
                    // Seeing as we know that the login has failed, but if we do that, then
                    // connection will be retried each time the interconnection interval
                    // expires. By leaving them as they are, the connection will be retried
                    // when the login timeout expires. Which is preferred.
                }

            }

            return;

        }

        // Reconnect is used to force a re-cycle of the IRC connection. Should generally
        // be a transparent event

        public void Reconnect()
        {
            m_log.DebugFormat("[IRC-Connector-{0}]: Reconnect request for {1} on {2}:{3}", idn, m_nick, m_server, m_ircChannel);

            // Don't do this if a Connect is in progress...

            lock (msyncConnect)
            {

                if (m_connected)
                {

                    m_log.InfoFormat("[IRC-Connector-{0}] Resetting connector", idn);

                    // Mark as disconnected. This will allow the listener thread
                    // to exit if still in-flight.


                    // The listener thread is not aborted - it *might* actually be
                    // the thread that is running the Reconnect! Instead just close
                    // the socket and it will disappear of its own accord, once this
                    // processing is completed.

                    try { m_writer.Close(); }
                    catch (Exception) { }
                    try { m_reader.Close(); }
                    catch (Exception) { }
                    try { m_tcp.Close(); }
                    catch (Exception) { }

                    m_connected = false;
                    m_pending = false;
                    m_resetk++;

                }

            }

            Connect();

        }

        #endregion

        #region Outbound (to-IRC) message handlers

        public void PrivMsg(string pattern, string from, string region, string msg)
        {

            // m_log.DebugFormat("[IRC-Connector-{0}] PrivMsg to IRC from {1}: <{2}>", idn, from, 
            //     String.Format(pattern, m_ircChannel, from, region, msg));

            // One message to the IRC server

            try
            {
                m_writer.WriteLine(pattern, m_ircChannel, from, region, msg);
                m_writer.Flush();
                // m_log.DebugFormat("[IRC-Connector-{0}]: PrivMsg from {1} in {2}: {3}", idn, from, region, msg);
            }
            catch (IOException)
            {
                m_log.ErrorFormat("[IRC-Connector-{0}]: PrivMsg I/O Error: disconnected from IRC server", idn);
                Reconnect();
            }
            catch (Exception ex)
            {
                m_log.ErrorFormat("[IRC-Connector-{0}]: PrivMsg exception : {1}", idn, ex.Message);
                m_log.Debug(ex);
            }

        }

        public void Send(string msg)
        {

            // m_log.DebugFormat("[IRC-Connector-{0}] Send to IRC : <{1}>", idn,  msg);

            try
            {
                m_writer.WriteLine(msg);
                m_writer.Flush();
                // m_log.DebugFormat("[IRC-Connector-{0}] Sent command string: {1}", idn, msg);
            }
            catch (IOException)
            {
                m_log.ErrorFormat("[IRC-Connector-{0}] Disconnected from IRC server.(Send)", idn);
                Reconnect();
            }
            catch (Exception ex)
            {
                m_log.ErrorFormat("[IRC-Connector-{0}] Send exception trap: {0}", idn, ex.Message);
                m_log.Debug(ex);
            }

        }

        #endregion

        public void ListenerRun()
        {

            string inputLine;
            int resetk = m_resetk;

            try
            {
                while (m_enabled && m_connected)
                {
                    if ((inputLine = m_reader.ReadLine()) == null)
                        throw new Exception("Listener input socket closed");

                    Watchdog.UpdateThread();

                    // m_log.Info("[IRCConnector]: " + inputLine);

                    if (inputLine.Contains("PRIVMSG"))
                    {
                        Dictionary<string, string> data = ExtractMsg(inputLine);

                        // Any chat ???
                        if (data != null)
                        {
                            OSChatMessage c = new OSChatMessage();
                            c.Message = data["msg"];
                            c.Type = ChatTypeEnum.Region;
                            c.Position = CenterOfRegion;
                            c.From =  data["nick"] + "@IRC";
                            c.Sender = null;
                            c.SenderUUID = UUID.Zero;

                            // Is message "\001ACTION foo bar\001"? 
                            // Then change to: "/me foo bar"

                            if ((1 == c.Message[0]) && c.Message.Substring(1).StartsWith("ACTION"))
                                c.Message = String.Format("/me {0}", c.Message.Substring(8, c.Message.Length - 9));

                            ChannelState.OSChat(this, c, false);
                        }
                    }
                    else
                    {
                        ProcessIRCCommand(inputLine);
                    }
                }
            }
            catch (Exception /*e*/)
            {
                // m_log.ErrorFormat("[IRC-Connector-{0}]: ListenerRun exception trap: {1}", idn, e.Message);
                // m_log.Debug(e);
            }

            // This is potentially circular, but harmless if so.
            // The connection is marked as not connected the first time
            // through reconnect.

            if (m_enabled && (m_resetk == resetk))
                Reconnect();

            Watchdog.RemoveThread();
        }

        private Regex RE = new Regex(@":(?<nick>[\w-]*)!(?<user>\S*) PRIVMSG (?<channel>\S+) :(?<msg>.*)",
                                     RegexOptions.Multiline);

        private Dictionary<string, string> ExtractMsg(string input)
        {
            //examines IRC commands and extracts any private messages
            // which will then be reboadcast in the Sim

            // m_log.InfoFormat("[IRC-Connector-{0}]: ExtractMsg: {1}", idn, input);

            Dictionary<string, string> result = null;
            MatchCollection matches = RE.Matches(input);

            // Get some direct matches $1 $4 is a
            if ((matches.Count == 0) || (matches.Count != 1) || (matches[0].Groups.Count != 5))
            {
                // m_log.Info("[IRCConnector]: Number of matches: " + matches.Count);
                // if (matches.Count > 0)
                // {
                //     m_log.Info("[IRCConnector]: Number of groups: " + matches[0].Groups.Count);
                // }
                return null;
            }

            result = new Dictionary<string, string>();
            result.Add("nick", matches[0].Groups[1].Value);
            result.Add("user", matches[0].Groups[2].Value);
            result.Add("channel", matches[0].Groups[3].Value);
            result.Add("msg", matches[0].Groups[4].Value);

            return result;
        }

        public void BroadcastSim(string sender, string format, params string[] args)
        {
            try
            {
                OSChatMessage c = new OSChatMessage();
                c.From = sender;
                c.Message = String.Format(format, args);
                c.Type = ChatTypeEnum.Region; // ChatTypeEnum.Say;
                c.Position = CenterOfRegion;
                c.Sender = null;
                c.SenderUUID = UUID.Zero;

                ChannelState.OSChat(this, c, true);

            }
            catch (Exception ex) // IRC gate should not crash Sim
            {
                m_log.ErrorFormat("[IRC-Connector-{0}]: BroadcastSim Exception Trap: {1}\n{2}", idn, ex.Message, ex.StackTrace);
            }
        }

        #region IRC Command Handlers

        public void ProcessIRCCommand(string command)
        {

            string[] commArgs;
            string c_server = m_server;

            string pfx = String.Empty;
            string cmd = String.Empty;
            string parms = String.Empty;

            // ":" indicates that a prefix is present
            // There are NEVER more than 17 real 
            // fields. A parameter that starts with 
            // ":" indicates that the remainder of the
            // line is a single parameter value.

            commArgs = command.Split(CS_SPACE, 2);

            if (commArgs[0].StartsWith(":"))
            {
                pfx = commArgs[0].Substring(1);
                commArgs = commArgs[1].Split(CS_SPACE, 2);
            }

            cmd = commArgs[0];
            parms = commArgs[1];

            // m_log.DebugFormat("[IRC-Connector-{0}] prefix = <{1}> cmd = <{2}>", idn, pfx, cmd);

            switch (cmd)
            {

                // Messages 001-004 are always sent
                // following signon.

                case "001": // Welcome ...
                case "002": // Server information
                case "003": // Welcome ...
                    break;
                case "004": // Server information
                    m_log.DebugFormat("[IRC-Connector-{0}] [{1}] parms = <{2}>", idn, cmd, parms);
                    commArgs = parms.Split(CS_SPACE);
                    c_server = commArgs[1];
                    m_server = c_server;
                    version = commArgs[2];
                    usermod = commArgs[3];
                    chanmod = commArgs[4];

                    m_writer.WriteLine(String.Format("JOIN {0}", m_ircChannel));
                    m_writer.Flush();
                    m_log.InfoFormat("[IRC-Connector-{0}]: sent request to join {1} ", idn, m_ircChannel);

                    break;
                case "005": // Server information
                    break;
                case "042":
                case "250":
                case "251":
                case "252":
                case "254":
                case "255":
                case "265":
                case "266":
                case "332": // Subject
                case "333": // Subject owner (?)
                case "353": // Name list
                case "366": // End-of-Name list marker
                case "372": // MOTD body
                case "375": // MOTD start
                    // m_log.InfoFormat("[IRC-Connector-{0}] [{1}] {2}", idn, cmd, parms.Split(CS_SPACE,2)[1]);
                    break;
                case "376": // MOTD end
                    // m_log.InfoFormat("[IRC-Connector-{0}] [{1}] {2}", idn, cmd, parms.Split(CS_SPACE,2)[1]);
                    motd = true;
                    break;
                case "451": // Not registered
                    break;
                case "433": // Nickname in use
                    // Gen a new name
                    m_nick = m_baseNick + Util.RandomClass.Next(1, 99);
                    m_log.ErrorFormat("[IRC-Connector-{0}]: [{1}] IRC SERVER reports NicknameInUse, trying {2}", idn, cmd, m_nick);
                    // Retry
                    m_writer.WriteLine(String.Format("NICK {0}", m_nick));
                    m_writer.Flush();
                    m_writer.WriteLine(m_user);
                    m_writer.Flush();
                    m_writer.WriteLine(String.Format("JOIN {0}", m_ircChannel));
                    m_writer.Flush();
                    break;
                case "479": // Bad channel name, etc. This will never work, so disable the connection
                    m_log.ErrorFormat("[IRC-Connector-{0}] [{1}] {2}", idn, cmd, parms.Split(CS_SPACE, 2)[1]);
                    m_log.ErrorFormat("[IRC-Connector-{0}] [{1}] Connector disabled", idn, cmd);
                    m_enabled = false;
                    m_connected = false;
                    m_pending = false;
                    break;
                case "NOTICE":
                    // m_log.WarnFormat("[IRC-Connector-{0}] [{1}] {2}", idn, cmd, parms.Split(CS_SPACE,2)[1]);
                    break;
                case "ERROR":
                    m_log.ErrorFormat("[IRC-Connector-{0}] [{1}] {2}", idn, cmd, parms.Split(CS_SPACE, 2)[1]);
                    if (parms.Contains("reconnect too fast"))
                        ICCD_PERIOD++;
                    m_pending = false;
                    Reconnect();
                    break;
                case "PING":
                    m_log.DebugFormat("[IRC-Connector-{0}] [{1}] parms = <{2}>", idn, cmd, parms);
                    m_writer.WriteLine(String.Format("PONG {0}", parms));
                    m_writer.Flush();
                    break;
                case "PONG":
                    break;
                case "JOIN":

                    m_log.DebugFormat("[IRC-Connector-{0}] [{1}] parms = <{2}>", idn, cmd, parms);
                    eventIrcJoin(pfx, cmd, parms);
                    break;
                case "PART":
                    m_log.DebugFormat("[IRC-Connector-{0}] [{1}] parms = <{2}>", idn, cmd, parms);
                    eventIrcPart(pfx, cmd, parms);
                    break;
                case "MODE":
                    m_log.DebugFormat("[IRC-Connector-{0}] [{1}] parms = <{2}>", idn, cmd, parms);
                    eventIrcMode(pfx, cmd, parms);
                    break;
                case "NICK":
                    m_log.DebugFormat("[IRC-Connector-{0}] [{1}] parms = <{2}>", idn, cmd, parms);
                    eventIrcNickChange(pfx, cmd, parms);
                    break;
                case "KICK":
                    m_log.DebugFormat("[IRC-Connector-{0}] [{1}] parms = <{2}>", idn, cmd, parms);
                    eventIrcKick(pfx, cmd, parms);
                    break;
                case "QUIT":
                    m_log.DebugFormat("[IRC-Connector-{0}] [{1}] parms = <{2}>", idn, cmd, parms);
                    eventIrcQuit(pfx, cmd, parms);
                    break;
                default:
                    m_log.DebugFormat("[IRC-Connector-{0}] Command '{1}' ignored, parms = {2}", idn, cmd, parms);
                    break;
            }

            // m_log.DebugFormat("[IRC-Connector-{0}] prefix = <{1}> cmd = <{2}> complete", idn, pfx, cmd);

        }

        public void eventIrcJoin(string prefix, string command, string parms)
        {
            string[] args = parms.Split(CS_SPACE, 2);
            string IrcUser = prefix.Split('!')[0];
            string IrcChannel = args[0];

            if (IrcChannel.StartsWith(":"))
                IrcChannel = IrcChannel.Substring(1);

            if(IrcChannel == m_ircChannel)
            {
                m_log.InfoFormat("[IRC-Connector-{0}] Joined requested channel {1} at {2}", idn, IrcChannel,m_server);
                m_pending = false;
            }
            else
                m_log.InfoFormat("[IRC-Connector-{0}] Joined unknown channel {1} at {2}", idn, IrcChannel,m_server);
            BroadcastSim(IrcUser, "/me joins {0}", IrcChannel);
        }

        public void eventIrcPart(string prefix, string command, string parms)
        {
            string[] args = parms.Split(CS_SPACE, 2);
            string IrcUser = prefix.Split('!')[0];
            string IrcChannel = args[0];

            m_log.DebugFormat("[IRC-Connector-{0}] Event: IRCPart {1}:{2}", idn, m_server, m_ircChannel);
            BroadcastSim(IrcUser, "/me parts {0}", IrcChannel);
        }

        public void eventIrcMode(string prefix, string command, string parms)
        {
            string[] args = parms.Split(CS_SPACE, 2);
            string UserMode = args[1];

            m_log.DebugFormat("[IRC-Connector-{0}] Event: IRCMode {1}:{2}", idn, m_server, m_ircChannel);
            if (UserMode.Substring(0, 1) == ":")
            {
                UserMode = UserMode.Remove(0, 1);
            }
        }

        public void eventIrcNickChange(string prefix, string command, string parms)
        {
            string[] args = parms.Split(CS_SPACE, 2);
            string UserOldNick = prefix.Split('!')[0];
            string UserNewNick = args[0].Remove(0, 1);

            m_log.DebugFormat("[IRC-Connector-{0}] Event: IRCNickChange {1}:{2}", idn, m_server, m_ircChannel);
            BroadcastSim(UserOldNick, "/me is now known as {0}", UserNewNick);
        }

        public void eventIrcKick(string prefix, string command, string parms)
        {
            string[] args = parms.Split(CS_SPACE, 3);
            string UserKicker = prefix.Split('!')[0];
            string IrcChannel = args[0];
            string UserKicked = args[1];
            string KickMessage = args[2];

            m_log.DebugFormat("[IRC-Connector-{0}] Event: IRCKick {1}:{2}", idn, m_server, m_ircChannel);
            BroadcastSim(UserKicker, "/me kicks kicks {0} off {1} saying \"{2}\"", UserKicked, IrcChannel, KickMessage);

            if (UserKicked == m_nick)
            {
                BroadcastSim(m_nick, "Hey, that was me!!!");
            }

        }

        public void eventIrcQuit(string prefix, string command, string parms)
        {
            string IrcUser = prefix.Split('!')[0];
            string QuitMessage = parms;

            m_log.DebugFormat("[IRC-Connector-{0}] Event: IRCQuit {1}:{2}", idn, m_server, m_ircChannel);
            BroadcastSim(IrcUser, "/me quits saying \"{0}\"", QuitMessage);
        }

        #endregion

        #region Connector Watch Dog

        // A single watch dog monitors extant connectors and makes sure that they
        // are re-connected as necessary. If a connector IS connected, then it is
        // pinged, but only if a PING period has elapsed.

        protected static void WatchdogHandler(Object source, ElapsedEventArgs args)
        {

            // m_log.InfoFormat("[IRC-Watchdog] Status scan, pdk = {0}, icc = {1}", _pdk_, _icc_);

            _pdk_ = (_pdk_ + 1) % PING_PERIOD;    // cycle the ping trigger
            _icc_++;    // increment the inter-consecutive-connect-delay counter

            lock (m_connectors)
                foreach (IRCConnector connector in m_connectors)
                {

                    // m_log.InfoFormat("[IRC-Watchdog] Scanning {0}", connector);

                    if (connector.Enabled)
                    {
                        if (!connector.Connected)
                        {
                            try
                            {
                                // m_log.DebugFormat("[IRC-Watchdog] Connecting {1}:{2}", connector.idn, connector.m_server, connector.m_ircChannel);
                                connector.Connect();
                            }
                            catch (Exception e)
                            {
                                m_log.ErrorFormat("[IRC-Watchdog] Exception on connector {0}: {1} ", connector.idn, e.Message);
                            }
                        }
                        else
                        {

                            if (connector.m_pending)
                            {
                                if (connector.m_timeout == 0)
                                {
                                    m_log.ErrorFormat("[IRC-Watchdog] Login timed-out for connector {0}, reconnecting", connector.idn);
                                    connector.Reconnect();
                                }
                                else
                                    connector.m_timeout--;
                            }

                            // Being marked connected is not enough to ping. Socket establishment can sometimes take a long
                            // time, in which case the watch dog might try to ping the server before the socket has been 
                            // set up, with nasty side-effects.

                            else if (_pdk_ == 0)
                            {
                                try
                                {
                                    connector.m_writer.WriteLine(String.Format("PING :{0}", connector.m_server));
                                    connector.m_writer.Flush();
                                }
                                catch (Exception e)
                                {
                                    m_log.ErrorFormat("[IRC-PingRun] Exception on connector {0}: {1} ", connector.idn, e.Message);
                                    m_log.Debug(e);
                                    connector.Reconnect();
                                }
                            }

                        }
                    }
                }

            // m_log.InfoFormat("[IRC-Watchdog] Status scan completed");

        }

        #endregion

    }
}