async void sendMessage(string message)
{
byte[] buf;
if (status != clientStatus.ENCRYPTED)
{
return;
}
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), key);
}
buf = System.Text.Encoding.ASCII.GetBytes(cipher);
if (stream.CanWrite)
{
await stream.WriteAsync(buf, 0, buf.Length);
// System.Console.WriteLine("Phy Send: {0}",cipher);
}
}
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 receiveEvent()
{
byte[] buf = new byte[MAX_BUF_SIZE];
//接收密钥
while (true)
{
if (stream.CanRead)
{
int count = stream.Read(buf, 0, MAX_BUF_SIZE);
string recv = System.Text.Encoding.ASCII.GetString(buf);
//密钥以明文形式发送
if (recv.Contains("KEY:"))
{
System.Console.WriteLine(recv);
key = Convert.FromBase64String(recv.Substring(4, 12));
// System.Console.WriteLine("Key: {0}",Convert.ToBase64String(key));
status = clientStatus.ENCRYPTED;
break;
}
else
{
stream.Write(System.Text.Encoding.ASCII.GetBytes("SEND KEY"), 0, System.Text.Encoding.ASCII.GetByteCount("SEND KEY"));
}
}
}
//接收消息循环
//在服务器端关闭时会报错退出
try
{
while (true)
{
string message = string.Empty;
// byte[] buf=new byte[MAX_BUF_SIZE];
if (status != clientStatus.ENCRYPTED)
{
return;
}
while (true)
{
int count = await stream.ReadAsync(buf, 0, MAX_BUF_SIZE);
message += System.Text.Encoding.ASCII.GetString(buf, 0, count);
if (count < MAX_BUF_SIZE)
{
break;
}
}
// System.Console.WriteLine("Phys Recv: {0}",message);
for (int i = 0; i < message.Length; i += 24)
{
string part = message.Substring(i, message.Length - i >= 24 ? 24 : message.Length - i);
DESCrypt crypt = new DESCrypt();
part = crypt.Decrypt(part, key);
System.Console.Write(part);
}
System.Console.WriteLine();
message.Remove(0);
}
}
catch (Exception ex)
{
System.Console.WriteLine(ex);
stream.Close();
client.Close();
Environment.Exit(-1);
}
}
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);
}
}
}
