public async void startListen()
{
listener.Start();
status = serverStatus.LISTENING;
System.Console.WriteLine("Loading server commands...");
ServerCommands.LoadCmdDict();
System.Console.WriteLine("Server started at {0}", port);
while (true)
{
var client = await listener.AcceptTcpClientAsync();
clientInfo info = new clientInfo(client);
System.Console.WriteLine("New user {0} connected.",
info.UserName);
System.Console.WriteLine("Key: {0}", Convert.ToBase64String(info.Key));
clientList.Add(info);
this.clientEvent(info);
}
}
async void sendMessageToClient(string message, clientInfo info)
{
byte[] buf;
TcpClient client = info.Client;
if (!client.Connected)
{
return;
}
NetworkStream stream = client.GetStream();
string cipher = string.Empty;
for (int i = 0; i < message.Length; i += 8)
{
DESCrypt crypt = new DESCrypt();
cipher += crypt.Encrypt(message.Substring(i, message.Length - i >= 8 ? 8 : message.Length - i), info.Key);
}
buf = System.Text.Encoding.ASCII.GetBytes(cipher);
if (stream.CanWrite)
{
await stream.WriteAsync(buf, 0, buf.Length);
}
// stream.Close();
}
async void clientEvent(clientInfo info)
{
byte[] buf = new byte[1024];
TcpClient client = info.Client;
NetworkStream stream = client.GetStream();
//发送密钥
if (stream.CanWrite)
{
stream.Write(info.Key, 0, info.Key.Length);
}
while (true)
{
if (status != serverStatus.LISTENING)
{
return;
}
else if (!client.Connected)
{
// clientList.Remove(client);
stream.Close();
this.removeClient(info);
return;
}
string recv = string.Empty;
try
{
while (true)
{
if (!client.Connected)
{
stream.Close();
this.removeClient(info);
// clientList.Remove(client);
return;
}
if (stream.CanRead)
{
int count = await stream.ReadAsync(buf, 0, MAX_BUF_SIZE);
recv += System.Text.Encoding.ASCII.GetString(buf, 0, count);
if (count == 0)
{
stream.Close();
// clientList.Remove(client);
this.removeClient(info);
return;
}
else if (count < MAX_BUF_SIZE)
{
break;
}
}
else
{
System.Console.WriteLine("Uncatched stream closed");
}
}
}
catch (Exception e)
{
System.Console.WriteLine(e);
stream.Close();
client.Close();
return;
}
if (recv.Length <= 0)
{
return;
}
//处理客户端命令
if (recv == "SEND KEY")
{
if (stream.CanWrite)
{
string sendKey = "KEY:" + Convert.ToBase64String(info.Key);
await stream.WriteAsync(System.Text.Encoding.ASCII.GetBytes(sendKey), 0, System.Text.Encoding.ASCII.GetByteCount(sendKey));
}
continue;
}
//非客户端命令，解密消息
string message = string.Empty;
for (int i = 0; i < recv.Length; i += 24)
{
string part = recv.Substring(i, recv.Length - i >= 24 ? 24 : recv.Length - i);
DESCrypt crypt = new DESCrypt();
message += crypt.Decrypt(part, info.Key);
// System.Console.Write(part);
}
System.Console.WriteLine("New message from:{0}", info.UserName);
System.Console.WriteLine("\tContent:{0}", message);
string reply = String.Empty;
if (!ServerCommands.CheckServerCommands(info, message, out reply))
{
string messageToClient = string.Format("{0}:{1}", info.UserName, message);
foreach (var i in clientList)
{
if (i != info && i.Client.Connected)
{
this.sendMessageToClient(messageToClient, i);
}
}
}
else
{
this.sendMessageToClient(reply, info);
}
}
}
void removeClient(clientInfo info)
{
System.Console.WriteLine("User {0} quited.", info.UserName);
info.Client.Close();
clientList.Remove(info);
}