bool SendMessageToServerAndWaitReply(string msg)
{
try
{
MyFTPHelper.WriteToNetStream(msg, controlStream);
ReadServerReply();
return(true);
}
catch (Exception exc)
{
if (exc.GetType() == typeof(IOException))
{
serverDisconnectEvent(this, new EventArgs());
}
PostMessageToConsoleWithLock(exc.Message);
return(false);
}
}
public void Start()
{
while (true)
{
try
{
FTPCommand?ncommand = ReadNextCommand();
if (ncommand == null)
{
continue;
}
else
{
FTPCommand command = ncommand.Value;
FTPReply reply = new FTPReply()
{
replyCode = FTPReply.Code_SyntaxError
};
switch (command.controlCommand)
{
case "USER": //USER 指定账号
if (command.parameters.Length != 1)
{
reply = new FTPReply()
{
replyCode = FTPReply.Code_SyntaxErrorPara,
};
break;
}
user.username = command.parameters[0];
break;
case "PASS": //PASS 指定密码
if (command.parameters.Length != 1)
{
reply = new FTPReply()
{
replyCode = FTPReply.Code_SyntaxErrorPara,
};
break;
}
user.password = command.parameters[0];
if (serverDispatcher.CheckUserWithLock(user))
{
Logined = true;
serverDispatcher.PostMessageFromClient("已成功登录", this);
reply = new FTPReply()
{
replyCode = FTPReply.Code_UserLoggedIn,
post = "login success"
};
}
else
{
serverDispatcher.PostMessageFromClient("密码或用户名有误", this);
reply = new FTPReply()
{
replyCode = FTPReply.Code_UserNotLogIn,
post = "login fail"
};
}
break;
case "LIST": //LIST 返回服务器的文件目录（标准中不指定返回格式，格式为我们自定义）
reply = new FTPReply()
{
replyCode = FTPReply.Code_FileList,
post = serverDispatcher.GetEncodedFileList()
};
break;
case "STOR": //STOR 客户端上传文件
if (command.parameters.Length != 1)
{
reply = new FTPReply()
{
replyCode = FTPReply.Code_SyntaxErrorPara
};
break;
}
string filename = command.parameters[0];
FileStream downloadFileStream = File.OpenWrite(serverDispatcher.GetCurrentDirectory() + filename);
NetworkStream downloadDataStream = dataClient.GetStream();
if (downloadFileStream == null)
{
reply = new FTPReply()
{
replyCode = FTPReply.Code_CantOopenDataConnection
};
break;
}
if (dataClient == null)
{
reply = new FTPReply()
{
replyCode = FTPReply.Code_ConnectionClosed
};
break;
}
currentTransfer = new FileTransfer()
{
networkStream = downloadDataStream,
filestream = downloadFileStream,
};
currentTransfer.DownloadAsync(() =>
{
downloadDataStream.Close();
downloadFileStream.Close();
serverDispatcher.PostMessageFromClient("文件上传完成", this);
}
);
reply = new FTPReply()
{
replyCode = FTPReply.Code_ConnectionClosed
};
break;
case "RETR": //RETR 客户端下载文件
if (command.parameters.Length != 1)
{
reply = new FTPReply()
{
replyCode = FTPReply.Code_SyntaxErrorPara
};
break;
}
FileStream uploadFileStream = serverDispatcher.OpenFileStreamInfileList(command.parameters[0]);
NetworkStream uploadDataStream = dataClient.GetStream();
if (uploadFileStream == null)
{
reply = new FTPReply()
{
replyCode = FTPReply.Code_CantOopenDataConnection
};
break;
}
if (dataClient == null)
{
reply = new FTPReply()
{
replyCode = FTPReply.Code_ConnectionClosed
};
break;
}
currentTransfer = new FileTransfer()
{
networkStream = uploadDataStream,
filestream = uploadFileStream,
};
currentTransfer.UploadAsync(() =>
{
uploadDataStream.Close();
uploadFileStream.Close();
serverDispatcher.PostMessageFromClient("文件上传完成", this);
}
);
reply = new FTPReply()
{
replyCode = FTPReply.Code_ConnectionClosed
};
break;
case "ABOR": //QUIT 关闭与服务器的连接
throw new NotImplementedException();
case "QUIT": //ABOR 放弃之前的文件传输
throw new NotImplementedException();
case "PASV": //PASV 数据线程让服务器监听特定端口
throw new NotImplementedException();
case "PORT": //PORT 客户端的控制端口为N，数据端口为N+1，服务器的控制端口为21，数据端口为20
if (command.parameters.Length != 1 || !int.TryParse(command.parameters[0], out controlPort))
{
reply = new FTPReply()
{
replyCode = FTPReply.Code_SyntaxErrorPara
};
break;
}
if (!serverDispatcher.CheckDataPortLegal(controlPort, this))
{
reply = new FTPReply()
{
replyCode = FTPReply.Code_CantOopenDataConnection
};
break;
}
var remoteDataEnd = (IPEndPoint)controlClient.Client.RemoteEndPoint;
remoteDataEnd.Port = controlPort + 1;
dataClient = new TcpClient();
reply = new FTPReply()
{
replyCode = FTPReply.Code_DataConnectionOpen
};
dataClient.ConnectAsync(remoteDataEnd.Address.MapToIPv4(), remoteDataEnd.Port);
serverDispatcher.PostMessageFromClient("与" + user.username + "建立数据连接", this);
break;
default:
break;
}
MyFTPHelper.WriteToNetStream(reply.ToString(), controlStream);
}
}
catch (System.IO.IOException exc)
{
serverDispatcher.PostMessageFromClient(exc.Message, this);
controlClient.Close();
controlStream.Close();
return;
}
}
}