FileZilla source code analysis 7

FileZillaIt is a fast and reliable FTP client and server-side open source code program with a variety of features and intuitive interfaces. This article analyzes the source code of FileZilla.

After the service thread wakes up, it calls OnThreadMessage to process the WM_FILEZILLA_THREADMSG message. The parameter is FTM_NEWSOCKET and sockethandle. Then it enters the AddNewSocket method, indicating that a new client needs to be connected.

Void CServerThread: AddNewSocket (SOCKET sockethandle, bool ssl)

{

// Create a new CControlSocket class, which is also inherited from the CAsyncSocketEx class. After initialization, The CControlSocket class will take over the client connection.

CControlSocket * socket = new CControlSocket (this );

Socket-> Attach (sockethandle); // Add it to the FileZilla message mechanism to establish the relationship with the distribution thread.

CStdString ip;

Unsigned int port;

SOCKADDR_IN sockAddr;

Memset (& sockAddr, 0, sizeof (sockAddr ));

Int nSockAddrLen = sizeof (sockAddr );

BOOL bResult = socket-> GetPeerName (SOCKADDR *) & sockAddr, & nSockAddrLen); // obtain the information of the socket Client

If (bResult)

{

Port = ntohs (sockAddr. sin_port); // port

Ip = inet_ntoa (sockAddr. sin_addr); // ip address

}

Else

{

Socket-> m_RemoteIP = _ T ("ip unknown ");

Socket-> m_userid = 0;

Socket-> SendStatus (_ T ("Can't get remote IP, disconnected"), 1 );

Socket-> Close ();

Delete socket;

Return;

}

Socket-> m_RemoteIP = ip;

EnterCritSection (m_GlobalThreadsync );

Int userid = CalcUserID (); // automatically generates a customer ID for the current socket connection: userID

If (userid =-1)

{

LeaveCritSection (m_GlobalThreadsync );

Socket-> m_userid = 0;

Socket-> SendStatus (_ T ("Refusing connection, server too busy! "), 1 );

Socket-> Send (_ T ("421 Server too busy, closing connection. Please retry later! "));

Socket-> Close ();

Delete socket;

Return;

}

Socket-> m_userid = userid;

T_socketdata data;

Data. pSocket = socket;

Data. pThread = this;

M_userids [userid] = data; // m_userids is static and is defined as static std: map m_userids;

// You can ignore hammering.

// Check if remote IP is blocked due to hammering

Std: map: iterator iter = m_antiHammerInfo.find (sockAddr. sin_addr.s_addr );

If (iter! = M_antiHammerInfo.end ())

{

If (iter-> second> 10)

Socket-> AntiHammerIncrease (25 );//~ 6 secs delay

}

LeaveCritSection (m_GlobalThreadsync );

EnterCritSection (m_threadsync );

// Record the CControlSocket processed by this service thread

M_LocalUserIDs [userid] = socket;

LeaveCritSection (m_threadsync );

T_connectiondata_add * conndata = new t_connectiondata_add;

T_connop * op = new t_connop;

Op-> data = conndata;

Op-> op = USERCONTROL_CONNOP_ADD; // The new user is about to connect. It must be used in OnServerMessage of CServer.

Op-> userid = userid;

Conndata-> pThread = this;

Memset (& sockAddr, 0, sizeof (sockAddr ));

NSockAddrLen = sizeof (sockAddr );

BResult = socket-> GetPeerName (SOCKADDR *) & sockAddr, & nSockAddrLen );

If (bResult)

{

Conndata-> port = ntohs (sockAddr. sin_port );

# Ifdef _ UNICODE

_ Tcscpy (conndata-> ip, ConvFromLocal (inet_ntoa (sockAddr. sin_addr); // copy the string

# Else

_ Tcscpy (conndata-> ip, inet_ntoa (sockAddr. sin_addr ));

# Endif

}

// Send a message to the global hMainWnd,

// The wParam type of the message is FSM_CONNECTIONDATA, indicating that the message is a connection-related message. The parameter is t_connop.

// These are used to process the message in WindowProc of the CServer. After the message is processed, it will be displayed below the admin window.

// Information similar to 000001 (not logged in) 127.0.0.1

SendNotification (FSM_CONNECTIONDATA, (LPARAM) op );

If (ssl) // SSL-related, you can skip this step first.

If (! Socket-> InitImplicitSsl ())

Return;

Socket-> AsyncSelect (FD_READ | FD_WRITE | FD_CLOSE); // establishes a listener relationship for these events on the socket

// SendStatus still calls the SendNotification method, but the sent parameter is FSM_STATUSMESSAGE,

// Therefore, the processing in CServer is not the same

Socket-> SendStatus (_ T ("Connected, sending welcome message..."), 0 );

// In this case, the lower part of the admin window displays a message similar to (000003) 3:26:47-(not logged in) (127.0.0.1)> Connected, sending welcome message...

// Format the welcome information below

CStdString msg = m_pOptions-> GetOption (OPTION_WELCOMEMESSAGE );

If (m_RawWelcomeMessage! = Msg)

{

M_RawWelcomeMessage = msg;

M_ParsedWelcomeMessage.clear ();

Msg. Replace (_ T ("%"), _ T ("\ 001 "));

Msg. Replace (_ T ("% v"), GetVersionString ());

Msg. Replace (_ T ("\ 001"), _ T ("% "));

ASSERT (msg! = _ T (""));

Int oldpos = 0;

Msg. Replace (_ T ("\ r \ n"), _ T ("\ n "));

Int pos = msg. Find (_ T ("\ n "));

CStdString line;

While (pos! =-1)

{

ASSERT (pos );

M_ParsedWelcomeMessage.push_back (_ T ("220-") + msg. Mid (oldpos, pos-oldpos ));

Oldpos = pos + 1;

Pos = msg. Find (_ T ("\ n"), oldpos );

}

Line = msg. Mid (oldpos );

If (line! = _ T (""))

M_ParsedWelcomeMessage.push_back (_ T ("220") + line );

Else

{

M_ParsedWelcomeMessage.back () [3] = 0;

}

}

// HideStatus indicates whether to send this welcome message to admin port

Bool hideStatus = m_pOptions-> GetOptionVal (OPTION_WELCOMEMESSAGE_HIDE )! = 0;

ASSERT (! M_ParsedWelcomeMessage.empty ());

For (std: list : Iterator iter = m_ParsedWelcomeMessage.begin (); iter! = M_ParsedWelcomeMessage.end (); iter ++)

// Send the message to the socket Client and send the message to the admin port. The parameter sent is FSM_STATUSMESSAGE.

If (! Socket-> Send (* iter ,! HideStatus ))

Break;

// Run here. The welcome information appears on the client logon interface and in the admin window, similar:

// (000003) 3:27:19-(not logged in) (127.0.0.1)> 220-FileZilla Server version 0.9.18 beta

// (000003) 3:27:22-(not logged in) (127.0.0.1)> 220-written by Tim Kosse (Tim.Kosse@gmx.de)

// (000003) 3:27:29-(not logged in) (127.0.0.1)> 220 Please visit http://sourceforge.net/projects/filezilla/

Through the complete description in this article, you should know the source code of FileZilla and hope to help you!