FileZilla FTP Server Source Code Analysis (4)

FileZilla FTPServer Source Code Analysis: FileZilla is a free and open-source FTP tool. Including FileZilla Client and FileZilla Server. FileZilla Server only provides windows versions. to upload a local website webpage file to the website Server or download a webpage file from the Server, you only need the FileZilla Client Version. FileZilla FTP Server Source Code Analysis

 
 

  
  
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< srcsrc="http://pagead2.googlesyndication.com/pagead/show_ads.js" type="text/javascript"> WM_FILEZILLA_SERVERMSG：  
  
  
 
 
 

WParam indicates a large classification, that is, what type of message, and lParam is the additional information, which varies depending on wParam.

WParam has the following types:

 
 

  
  
FSM_STATUSMESSAGE:  
  
  
 
 
 

Record the current activity, display the activity information in the admin window, and record it to the log file (you need to set the corresponding options). Open the admin window, the content displayed in the upper part is from.

LParam carries the t_statusmsg structure, which records the active user, ip, time, message, and so on.

For example:

 
 

  
  
(000001) 2006-7-23 16:03:56 - (not logged in) (127.0.0.1)> USER whg  
  
  
 
  
  
(000001) 2006-7-23 16:03:59 - (not logged in) (127.0.0.1)> 331 Password required for whg  
  
  
 
  
  
(000001) 2006-7-23 16:04:05 - (not logged in) (127.0.0.1)> PASS *  
  
  
 
  
  
(000001) 2006-7-23 16:04:11 - robert (127.0.0.1)> 230 Logged on  
  
  
 
  
  
FSM_CONNECTIONDATA:  
  
  
 
 
 

This is a connection-related message, such as a new connection, a successful user login, and a user logout. The information is sent to the admin window, which is displayed in the lower half of the admin window, that is, ID, Account, IP, and so on.

LParam carries the t_connop structure. The op in the structure indicates a more detailed connection classification. The possible values include:

 
 

  
  
USERCONTROL_CONNOP_ADD  
  
  
 
 
 

New users are connected (not logged on yet)

 
 

  
  
USERCONTROL_CONNOP_CHANGEUSER  
  
  
 
 
 

Logon successful

 
 

  
  
USERCONTROL_CONNOP_REMOVE  
  
  
 
 
 

The user exits, or is forcibly logged out due to time

 
 

  
  
USERCONTROL_CONNOP_TRANSFERINIT  
  
  
 
 
 

Transmission starts or ends, that is, data communication with the client. If data is transmitted, the ls command also causes data transmission.

 
 

  
  
USERCONTROL_CONNOP_TRANSFEROFFSETS  
  
  
 
 
 

Shows the transmission progress. For example, you need to display the current number of transmitted bytes and transmission rate to the admin window during file transmission.

All the information is displayed in the lower half of the admin window.

 
 

  
  
FSM_THREADCANQUIT:  
  
  
 
 
 

These messages are sent when the system exits, and the thread ends when the system processes the message.

 
 

  
  
FSM_SEND:  
  
  
 
 
 

The system sends this message as long as the data is sent, and the status bar in the admin window shows how much data the current user has sent.

 
 

  
  
FSM_RECV:  
  
  
 
 
 

The system sends this message as long as the data is received, and the status bar in the admin window shows how much data the current user has received.

It can be seen that the messages processed by the CServer are only admin or status messages, which should be sent when the listen thread and accep process the corresponding ftp request. The real FTP processing is not here.

1. FileZilla FTP Server Source Code Analysis 1)
2. FileZilla FTP Server Source Code Analysis 2)
3. FileZilla FTP Server Source code analysis 4)
4. FileZilla FTP Server Source Code Analysis 5)