/// <summary>
/// Removes the client from the client list and all of the server rooms
/// </summary>
/// <param name="client">Our client</param>
public static void RemoveClientFromAll(ClientInfo client)
{
Console.WriteLine($"Client {client.GetUsername()} disconnected");
// Remove client from global list
Console.WriteLine(Globals.ClientList.Remove(client)
? $"Removed client {client.GetUsername()} from client list"
: $"Error removing client {client.GetUsername()} from client list");
// remove from rooms too
int removedFrom = 0;
foreach (var room in Globals.ServerRooms)
{
if (room.RemoveClient(client))
{
removedFrom++;
// Notify all clients of new member list
List <string> toSendList = new List <string> {
room.RoomName()
};
toSendList.AddRange(room.GetAllClientsNames());
MessageAllClients(FormatMessage(Headers.RoomMembersResult, toSendList.ToArray()));
}
}
MessageAllClients(FormatMessage(Headers.ClientDisconnected, client.GetUsername()));// Notify all clients that this client left
Console.WriteLine($"Removed client {client.GetUsername()} from {removedFrom} rooms");
client.StopClient();
}
/// <summary>
/// Sends a private message to another member
/// </summary>
/// <param name="memberName">Member to message</param>
/// <param name="message">Unformatted message to send</param>
/// <param name="client">Client sending the message</param>
/// <returns>True if member was found and false otherwise</returns>
public static bool MessageMember(string memberName, string message, ClientInfo client)
{
foreach (var curClient in Globals.ClientList)
{
if (curClient.GetUsername() == memberName)
{
curClient.MessageClient(FormatMessage(Headers.PrivMsgData, client.GetUsername(), curClient.GetUsername(), message));
client.MessageClient(FormatMessage(Headers.PrivMsgData, client.GetUsername(), curClient.GetUsername(), message));
return(true);
}
}
return(false);
}
/// <summary>
/// Changes the clients username
/// </summary>
/// <param name="wantedUsername">The new username</param>
/// <param name="client">Our client</param>
/// <returns>True if username was changed and false otherwise</returns>
public static bool ChangeClientUsername(string wantedUsername, ClientInfo client)
{
if (wantedUsername == "")
{
return(false);
}
if (!UsernameTaken(wantedUsername) && client != null)
{
Console.Write($"Client changed usernames. Previous username: {client.GetUsername()}\tNew username: "******"ERROR: Client wasn't in client list");
return(false);
}
/// <summary>
/// Sends a message to all members in a room
/// </summary>
/// <param name="roomName">Name of room to message</param>
/// <param name="message">Unformatted message to send</param>
/// <param name="client">Client sending the message</param>
/// <returns>True if room exists and false if it doesn't</returns>
public static bool MessageRoomMembers(string roomName, string message, ClientInfo client)
{
foreach (var room in Globals.ServerRooms)
{
// if room name is invalid or client isn't a member we continue looping
if (room.RoomName() != roomName || !room.Contains(client))
{
continue;
}
room.MessageClients(FormatMessage(Headers.RoomMsgData, roomName, client.GetUsername(), message));
return(true);
}
return(false);
}
/// <summary>
/// Runs when data is sent to the client
/// </summary>
/// <param name="asyncResult">Result containing the client info</param>
public void DataSentCallback(IAsyncResult asyncResult)
{
ClientInfo client = (ClientInfo)asyncResult.AsyncState;
try
{
if (_usingSsl)
{
client._clientSslStream.EndWrite(asyncResult);
Console.WriteLine($"DataSentCallbackSsl(): Successfully sent message to {client.GetUsername()}");
_semaphorePool.Release();
}
else
{
int result = client.ClientSocket().EndSend(asyncResult, out var errorCode);
Console.WriteLine(errorCode == SocketError.Success ?
$"Successfully sent message with size of {result} bytes to {client.GetUsername()}" :
$"Error sending. code: {errorCode}");
}
}
catch (Exception e)
{
Console.WriteLine("Unhandled DataSentCallback() Exception! " + e);
}
}
/// <summary>
/// Handles the commands sent from the client to the server
/// </summary>
/// <param name="command">The command received from the client</param>
/// <param name="client">Client that sent the command</param>
public static void CommandHandler(string command, ClientInfo client)
{
// Our format is
// COMMAND<EOL>COMMAND DATA<EOF>
string[] commandStrings = command.Split(new[] { "<EOL>" }, StringSplitOptions.None);
switch (commandStrings[0])
{
// Set username
// USERNAME<EOL>username<EOF>
// Will return
// USERNAMERESULT<EOL>TRUE?FALSE?USERNAME<EOL>NOTE<EOF>
// USERNAMECHANGE<EOL>OLDUSERNAME<EOL>NEWUSERNAME<EOF>
case Headers.Username:
string oldUsername = client.GetUsername();
// trim to remove white space from begging and end
if (ChangeClientUsername(commandStrings[1].Trim(), client))
{
client.MessageClient(FormatMessage(Headers.UsernameResult, "TRUE", client.GetUsername(), "Change successful"));
MessageAllClients(FormatMessage(Headers.UsernameChange, oldUsername, client.GetUsername())); // Message all clients of username change
}
else
{
client.MessageClient(FormatMessage(Headers.UsernameResult, "FALSE", client.GetUsername(), "Change unsuccessful; username taken"));
}
break;
// Make room
// MAKEROOM<EOL>ROOMNANE<EOF>
// Will return
// MAKEROOMRESULT<EOL>TRUE?FALSE<EOL>NOTE<EOL>ROOMCREATEDNAME<EOF>
case Headers.MakeRoom:
if (CreateRoom(commandStrings[1].Trim(), client))
{
client.MessageClient(FormatMessage(Headers.MakeRoomResult, "TRUE", "Created room successfully", commandStrings[1].Trim()));
MessageAllClients(FormatMessage(Headers.GetRoomsResult, GetRoomNameList().ToArray())); // Send all clients all of the rooms
}
else
{
client.MessageClient(FormatMessage(Headers.MakeRoomResult, "FALSE", "Error creating room. Room name could be taken"));
}
break;
// Delete room(can only be done by server or client who made it)
// REMOVEROOM<EOL>ROOMNAME<EOF>
// Will return
// REMOVEROOMRESULT<EOL>TRUE?FALSE<EOL>NOTE<EOF>
// ROOMREMOVED<EOL>ROOMNAME<EOF>
case Headers.RemoveRoom:
if (RemoveRoom(commandStrings[1].Trim(), client))
{
client.MessageClient(FormatMessage(Headers.RemoveRoomResult, "TRUE", "Removed room successfully"));
MessageAllClients(FormatMessage(Headers.RoomRemoved, commandStrings[1].Trim())); // Notify clients that the room was removed
}
else
{
client.MessageClient(FormatMessage(Headers.RemoveRoomResult, "FALSE", "Error removing room. Not owner or invalid room name"));
}
break;
// Get all rooms
// GETROOMS<EOF>
// Will return rooms in format
// GETROOMSRESULT<EOL>RM1<EOL>RM2<EOF>
case Headers.GetRooms:
client.MessageClient(FormatMessage(Headers.GetRoomsResult, GetRoomNameList().ToArray()));
break;
// Join room
// JOINROOM<EOL>ROOMNAME<EOF>
// Will return
// JOINROOMRESULT<EOL>TRUE?FALSE<EOF>
case Headers.JoinRoom:
client.MessageClient(AddClientToRoom(commandStrings[1].Trim(), client)
? FormatMessage(Headers.JoinRoomResult, "TRUE")
: FormatMessage(Headers.JoinRoomResult, "FALSE"));
break;
// Leave room
// LEAVEROOM<EOL>ROOMNAME<EOF>
// Will return
// LEAVEROOMRESULT<EOL>TRUE?FALSE<EOF>
case Headers.LeaveRoom:
client.MessageClient(RemoveClientFromRoom(commandStrings[1].Trim(), client)
? FormatMessage(Headers.LeaveRoomResult, "TRUE")
: FormatMessage(Headers.LeaveRoomResult, "FALSE"));
break;
// Get room members
// ROOMMEMBERS<EOL>ROOMNAME<EOF>
// Will return
// ROOMMEMBERSRESULT<EOL>ROOMNAME<EOL>MEM1<EOL>MEM2<EOF>
case Headers.RoomMembers:
List <string> roomMembers = new List <string> {
commandStrings[1].Trim()
};
if (GetRoomMembers(commandStrings[1].Trim(), ref roomMembers))
{
client.MessageClient(FormatMessage(Headers.RoomMembersResult, roomMembers.ToArray()));
}
break;
// Message to room
// ROOMMSG<EOL>ROOMNAME<EOL>MSG<EOF>
// Will return to client
// ROOMMSGRETURN<EOL>TRUE?FALSE<EOF>
// Will send to all room members
// ROOMMSGDATA<EOL>ROOMNAME<EOL>SENDERNAME<EOL>MSG<EOF>
// msg will be formatted in <username> CLIENTMSG
case Headers.RoomMsg:
client.MessageClient(MessageRoomMembers(commandStrings[1].Trim(), commandStrings[2].Trim(), client)
? FormatMessage(Headers.RoomMsgReturn, "TRUE")
: FormatMessage(Headers.RoomMsgReturn, "FALSE"));
break;
// Message from client to client
// PRIVMSG<EOL>DESTUSERNAME<EOL>MSG<EOF>
// Will return to client
// PRIVMSGRETURN<EOL>TRUE?FALSE<EOF>
// Will send to dest client
// PRIVMSGDATA<EOL>FROMUSERNAME<EOL>TOUSERNAME<EOL>MSG<EOF>
case Headers.PrivMsg:
client.MessageClient(MessageMember(commandStrings[1].Trim(), commandStrings[2].Trim(), client)
? FormatMessage(Headers.PrivMsgReturn, "TRUE")
: FormatMessage(Headers.PrivMsgReturn, "FALSE"));
break;
// CLIENTDISCONNECTING<EOF>
// Will return to all
// CLIENTDISCONNECTED<EOL>USERNAME<EOF>
case Headers.ClientDisconnecting:
RemoveClientFromAll(client);
break;
// Ping pong
// PING<EOF>
// Will return
// PONG<EOF>
case Headers.Ping:
client.MessageClient(FormatMessage(Headers.Pong));
break;
default:
// We don't know the command
break;
}
}
/// <summary>
/// Removes an existing room
/// </summary>
/// <param name="roomName">Room name to remove</param>
/// <param name="client">Client trying to remove the room</param>
/// <returns>True if room was removed and false otherwise</returns>
public static bool RemoveRoom(string roomName, ClientInfo client)
{
foreach (var room in Globals.ServerRooms)
{
if (room.RoomName() == roomName && room.IsOwner(client))
{
// Send a message to the room that it's getting removed
room.MessageClients(FormatMessage(Headers.RoomMsgData, roomName, "SERVER", $"Room owner {client.GetUsername()} has deleted the room."));
room.RemoveAllClients();
// Remove the room from the room list
Console.WriteLine(Globals.ServerRooms.Remove(room)
? $"Successfully deleted room {roomName}"
: $"Error removing room {roomName} from room list");
return(true);
}
}
return(false);
}
/// <summary>
/// Runs on a new client connection, and sets a client id and adds to list of clients.
/// </summary>
/// <param name="asyncResult">Result from connection containing socket to client</param>
public static void ClientConnectCallback(IAsyncResult asyncResult)
{
try
{
Socket clientSocket = Globals.Listener.EndAccept(asyncResult);
NetworkStream networkStream = new NetworkStream(clientSocket);
SslStream sslStream = new SslStream(networkStream, false);
// Authenticate the server but don't require the client to authenticate.
try
{
sslStream.AuthenticateAsServer(Globals.ServerCertificate, false,
true);
// Display the properties and settings for the authenticated stream.
HelperMethods.DisplaySecurityLevel(sslStream);
HelperMethods.DisplaySecurityServices(sslStream);
HelperMethods.DisplayCertificateInformation(sslStream);
HelperMethods.DisplayStreamProperties(sslStream);
// Set timeouts to 5 seconds.
sslStream.ReadTimeout = 5000;
sslStream.WriteTimeout = 5000;
}
catch (AuthenticationException e)
{
Console.WriteLine($"Exception: {e.Message}");
if (e.InnerException != null)
{
Console.WriteLine($"Inner exception: {e.InnerException.Message}");
}
Console.WriteLine("Authentication failed - closing the connection.");
sslStream.Close();
clientSocket.Close();
Globals.Listener.BeginAccept(ClientConnectCallback, null);// keep listening
return;
}
catch (Exception e)
{
Console.WriteLine($"Exception: {e.Message}");
sslStream.Close();
clientSocket.Close();
Globals.Listener.BeginAccept(ClientConnectCallback, null);// keep listening
return;
}
byte[] clientId = new byte[10];
Globals.Random.NextBytes(clientId);
string idString = clientId.Aggregate("", (current, idByte) => current + idByte);
// Keep trying until we get a username that isn't taken
while (HelperMethods.UsernameTaken(idString))
{
Globals.Random.NextBytes(clientId);
idString = clientId.Aggregate("", (current, idByte) => current + idByte);
}
ClientInfo newClient = new ClientInfo(clientSocket, sslStream, networkStream);
newClient.SetUsername(idString);// Set the default username to the randomly generated byte id
Globals.ClientList.Add(newClient);
Console.WriteLine($"Client {newClient.GetUsername()} connected");
newClient.BeginReceiveData();
Globals.Listener.BeginAccept(ClientConnectCallback, null);
}
catch (ObjectDisposedException)
{
Console.WriteLine("ClientConnectCallback(): Object already disposed");
}
catch (SocketException se)
{
Console.WriteLine(se.Message);
}
}
