/// <summary>
/// Add a host to the list of known hosts to communicate with and raise the <see cref="SCHost.OnAdd"/> event.
/// If there is already a host with the same IP address, then its nickname will be updated, no host will actually added and the <see cref="SCHost.OnAdd"/> event will not be raised.
/// </summary>
/// <param name="info">Information about the host to be added.</param>
/// <param name="notifyConflict">If <code>true</code> detects nickname conflicts if any (raising the <see cref="SCHost.OnConflictNotification"/> and sending a conflict notification PDU to the other host).</param>
/// <returns><code>true</code> if a host has actually been added, <code>false</code> if a nickname has been updated.</returns>
public bool Add(SCHostInfo info, bool notifyConflict = true)
{
bool alreadyInserted = false;
for (int i = 0; i < this.others.Count; i++)
{
if (this.others[i].Ip.Equals(info.Ip))
{
alreadyInserted = true;
this.others[i] = info;
}
else if (notifyConflict && this.others[i].Nickname == info.Nickname)
{
SCPdu notification = new SCPdu(this.myself.ChatID, SCPduType.NicknameConflictNotification, Encoding.Default, Encoding.Default.GetBytes(info.Ip.ToString()));
this.ManualSend(this.others[i].Ip, notification);
notification.Payload = Encoding.Default.GetBytes(this.others[i].Ip.ToString());
this.ManualSend(info.Ip, notification);
}
}
if (notifyConflict && info.Nickname == this.myself.Nickname)
{
SCPdu notification = new SCPdu(this.myself.ChatID, SCPduType.NicknameConflictNotification, Encoding.Default, Encoding.Default.GetBytes(IPAddress.Any.ToString()));
this.ManualSend(info.Ip, notification);
if (this.OnConflictNotification != null)
{
this.OnConflictNotification(this.myself, info);
}
}
if (!alreadyInserted)
{
this.others.Add(info);
}
return(!alreadyInserted);
}
/// <summary>
/// Add a host to the list of known hosts to communicate with and raise the <see cref="SCHost.OnAdd"/> event.
/// If there is already a host with the same IP address, then its nickname will be updated, no host will actually added and the <see cref="SCHost.OnAdd"/> event will not be raised.
/// </summary>
/// <param name="info">Information about the host to be added.</param>
/// <param name="notifyConflict">If <code>true</code> detects nickname conflicts if any (raising the <see cref="SCHost.OnConflictNotification"/> and sending a conflict notification PDU to the other host).</param>
/// <returns><code>true</code> if a host has actually been added, <code>false</code> if a nickname has been updated.</returns>
public bool Add(SCHostInfo info, bool notifyConflict = true)
{
bool alreadyInserted = false;
for (int i = 0; i < this.others.Count; i++)
{
if (this.others[i].Ip.Equals(info.Ip))
{
alreadyInserted = true;
this.others[i] = info;
}
else if (notifyConflict && this.others[i].Nickname == info.Nickname)
{
SCPdu notification = new SCPdu(this.myself.ChatID, SCPduType.NicknameConflictNotification, Encoding.Default, Encoding.Default.GetBytes(info.Ip.ToString()));
this.ManualSend(this.others[i].Ip, notification);
notification.Payload = Encoding.Default.GetBytes(this.others[i].Ip.ToString());
this.ManualSend(info.Ip, notification);
}
}
if (notifyConflict && info.Nickname == this.myself.Nickname)
{
SCPdu notification = new SCPdu(this.myself.ChatID, SCPduType.NicknameConflictNotification, Encoding.Default, Encoding.Default.GetBytes(IPAddress.Any.ToString()));
this.ManualSend(info.Ip, notification);
if (this.OnConflictNotification != null)
{
this.OnConflictNotification(this.myself, info);
}
}
if (!alreadyInserted)
{
this.others.Add(info);
}
return !alreadyInserted;
}
/// <summary>Initializes a new instance of the <see cref="SCHost"/> class.</summary>
/// <param name="nickname">The nickname to be associated with this host.</param>
/// <param name="chatID">The chat ID of the communication this host will take part into.</param>
/// <param name="key">The encryption key used in this communication.</param>
/// <param name="broadcast">The broadcast address of the local network.</param>
/// <param name="port">The port to be used in this communication.</param>
/// <param name="firstHello">If <code>true</code>, makes the host send a broadcast hello PDU once initialized.</param>
public SCHost(string nickname, string chatID, byte[] key, IPAddress broadcast = null, int port = 4412, bool firstHello = true)
{
if (key.Length != 16)
{
throw new ScedaException("A SCEDA key must be 16 bytes long.");
}
this.myself = new SCHostInfo();
this.myself.Nickname = nickname;
this.myself.ChatID = chatID;
this.myself.Port = port;
this.key = key;
this.others = new List<SCHostInfo>();
this.socket = new UdpClient(this.myself.Port);
this.socket.Client.EnableBroadcast = true;
this.myself.Ip = IPAddress.Loopback;
if (broadcast == null)
{
this.broadcast = IPAddress.Broadcast;
}
else
{
this.broadcast = broadcast;
}
this.disposed = false;
this.remainingMalformedNotifications = 4;
this.malformedTimer = new System.Timers.Timer(600000);
this.malformedTimer.Elapsed += delegate
{
this.remainingMalformedNotifications = 4;
};
this.listener = new Thread(delegate()
{
for (; ; )
{
IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, this.myself.Port);
byte[] binaryPdu = this.socket.Receive(ref endPoint);
bool local = endPoint.Address.Equals(IPAddress.Loopback);
foreach (IPAddress item in Dns.GetHostAddresses(Dns.GetHostName()))
{
if (endPoint.Address.Equals(item))
{
local = true;
}
}
if (!local && SCPdu.CheckChatID(binaryPdu, this.myself.ChatID))
{
SCHostInfo info = new SCHostInfo(endPoint.Address, endPoint.Port, this.GetNicknameFromIp(endPoint.Address), this.myself.ChatID);
try
{
SCPdu pdu = SCPdu.FromBinary(binaryPdu, this.key);
switch (pdu.Type)
{
case SCPduType.Hello:
{
info.Nickname = pdu.Encoding.GetString(pdu.Payload);
this.ManualSend(endPoint.Address, new SCPdu(this.myself.ChatID, SCPduType.Welcome, Encoding.Default, Encoding.Default.GetBytes(this.myself.Nickname)));
if (this.Add(info, true) && this.OnHello != null)
{
this.OnHello(info);
}
break;
}
case SCPduType.Welcome:
{
info.Nickname = pdu.Encoding.GetString(pdu.Payload);
if (this.Add(info, true) && this.OnWelcome != null)
{
this.OnWelcome(info);
}
break;
}
case SCPduType.Leave:
{
this.others.RemoveAll(item => item.Ip.Equals(info.Ip));
if (this.OnLeave != null)
{
this.OnLeave(info);
}
break;
}
case SCPduType.Message:
{
if (this.OnReceive != null)
{
this.OnReceive(info, pdu, pdu.Encoding.GetString(pdu.Payload));
}
break;
}
case SCPduType.MalformedPduNotification:
{
if (this.OnMalformedNotification != null)
{
this.OnMalformedNotification(info, pdu.Payload);
}
break;
}
case SCPduType.NicknameConflictNotification:
{
if (this.OnConflictNotification != null)
{
this.OnConflictNotification(info, new SCHostInfo(IPAddress.Parse(pdu.Encoding.GetString(pdu.Payload)), this.myself.Port, this.myself.Nickname, this.myself.ChatID));
}
break;
}
}
}
catch (MalformedPduException)
{
this.remainingMalformedNotifications--;
if (this.remainingMalformedNotifications > -1)
{
this.ManualSend(endPoint.Address, new SCPdu(this.myself.ChatID, SCPduType.Hello, Encoding.Default, new byte[0]));
this.malformedTimer.Start();
}
if (this.OnMalformedReceived != null)
{
this.OnMalformedReceived(info, binaryPdu);
}
}
}
}
});
this.listener.Start();
if (firstHello)
{
this.Hello();
}
}
static void myself_OnWelcome(SCHostInfo info)
{
int left;
int top;
ConsoleInsertLine(out left, out top);
ConsoleWriteInColor(info.Nickname + " is online.", ConsoleColor.Blue);
Console.SetCursorPosition(left, top);
}
/// <summary>Initializes a new instance of the <see cref="SCHost"/> class.</summary>
/// <param name="nickname">The nickname to be associated with this host.</param>
/// <param name="chatID">The chat ID of the communication this host will take part into.</param>
/// <param name="key">The encryption key used in this communication.</param>
/// <param name="broadcast">The broadcast address of the local network.</param>
/// <param name="port">The port to be used in this communication.</param>
/// <param name="firstHello">If <code>true</code>, makes the host send a broadcast hello PDU once initialized.</param>
public SCHost(string nickname, string chatID, byte[] key, IPAddress broadcast = null, int port = 4412, bool firstHello = true)
{
if (key.Length != 16)
{
throw new ScedaException("A SCEDA key must be 16 bytes long.");
}
this.myself = new SCHostInfo();
this.myself.Nickname = nickname;
this.myself.ChatID = chatID;
this.myself.Port = port;
this.key = key;
this.others = new List <SCHostInfo>();
this.socket = new UdpClient(this.myself.Port);
this.socket.Client.EnableBroadcast = true;
this.myself.Ip = IPAddress.Loopback;
if (broadcast == null)
{
this.broadcast = IPAddress.Broadcast;
}
else
{
this.broadcast = broadcast;
}
this.disposed = false;
this.remainingMalformedNotifications = 4;
this.malformedTimer = new System.Timers.Timer(600000);
this.malformedTimer.Elapsed += delegate
{
this.remainingMalformedNotifications = 4;
};
this.listener = new Thread(delegate()
{
for (; ;)
{
IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, this.myself.Port);
byte[] binaryPdu = this.socket.Receive(ref endPoint);
bool local = endPoint.Address.Equals(IPAddress.Loopback);
foreach (IPAddress item in Dns.GetHostAddresses(Dns.GetHostName()))
{
if (endPoint.Address.Equals(item))
{
local = true;
}
}
if (!local && SCPdu.CheckChatID(binaryPdu, this.myself.ChatID))
{
SCHostInfo info = new SCHostInfo(endPoint.Address, endPoint.Port, this.GetNicknameFromIp(endPoint.Address), this.myself.ChatID);
try
{
SCPdu pdu = SCPdu.FromBinary(binaryPdu, this.key);
switch (pdu.Type)
{
case SCPduType.Hello:
{
info.Nickname = pdu.Encoding.GetString(pdu.Payload);
this.ManualSend(endPoint.Address, new SCPdu(this.myself.ChatID, SCPduType.Welcome, Encoding.Default, Encoding.Default.GetBytes(this.myself.Nickname)));
if (this.Add(info, true) && this.OnHello != null)
{
this.OnHello(info);
}
break;
}
case SCPduType.Welcome:
{
info.Nickname = pdu.Encoding.GetString(pdu.Payload);
if (this.Add(info, true) && this.OnWelcome != null)
{
this.OnWelcome(info);
}
break;
}
case SCPduType.Leave:
{
this.others.RemoveAll(item => item.Ip.Equals(info.Ip));
if (this.OnLeave != null)
{
this.OnLeave(info);
}
break;
}
case SCPduType.Message:
{
if (this.OnReceive != null)
{
this.OnReceive(info, pdu, pdu.Encoding.GetString(pdu.Payload));
}
break;
}
case SCPduType.MalformedPduNotification:
{
if (this.OnMalformedNotification != null)
{
this.OnMalformedNotification(info, pdu.Payload);
}
break;
}
case SCPduType.NicknameConflictNotification:
{
if (this.OnConflictNotification != null)
{
this.OnConflictNotification(info, new SCHostInfo(IPAddress.Parse(pdu.Encoding.GetString(pdu.Payload)), this.myself.Port, this.myself.Nickname, this.myself.ChatID));
}
break;
}
}
}
catch (MalformedPduException)
{
this.remainingMalformedNotifications--;
if (this.remainingMalformedNotifications > -1)
{
this.ManualSend(endPoint.Address, new SCPdu(this.myself.ChatID, SCPduType.Hello, Encoding.Default, new byte[0]));
this.malformedTimer.Start();
}
if (this.OnMalformedReceived != null)
{
this.OnMalformedReceived(info, binaryPdu);
}
}
}
}
});
this.listener.Start();
if (firstHello)
{
this.Hello();
}
}
static void myself_OnReceive(SCHostInfo info, SCPdu pdu, string message)
{
int left;
int top;
ConsoleInsertLine(out left, out top);
if (info.Nickname == "")
{
ConsoleWriteInColor("unknown: ", ConsoleColor.Yellow);
}
else
{
ConsoleWriteInColor(info.Nickname + ": ", ConsoleColor.Cyan);
}
Console.Write(message);
Console.SetCursorPosition(left, top);
}
private static void myself_OnMalformed(SCHostInfo info, byte[] pdu)
{
int left;
int top;
ConsoleInsertLine(out left, out top);
ConsoleWriteInColor("Problem while communicating with " + info.Nickname, ConsoleColor.Red);
if (info.Nickname == "")
{
ConsoleWriteInColor("unknown", ConsoleColor.Yellow);
}
ConsoleWriteInColor("!", ConsoleColor.Red);
Console.SetCursorPosition(left, top);
}
static void myself_OnLeave(SCHostInfo info)
{
int left;
int top;
ConsoleInsertLine(out left, out top);
ConsoleWriteInColor(info.Nickname + " is offline!", ConsoleColor.Green);
Console.SetCursorPosition(left, top);
}
static void myself_OnHello(SCHostInfo info)
{
int left;
int top;
ConsoleInsertLine(out left, out top);
ConsoleWriteInColor(info.Nickname + " has joined the chat!", ConsoleColor.Blue);
Console.SetCursorPosition(left, top);
}
static void myself_OnConflictNotification(SCHostInfo informerInfo, SCHostInfo rivalInfo)
{
if (!conflictNotified)
{
conflictNotified = true;
int left;
int top;
ConsoleInsertLine(out left, out top);
ConsoleWriteInColor("Nickname conflict detected!", ConsoleColor.Red);
Console.SetCursorPosition(left, top);
}
}
