FTP

Creation of a client-server communication system and sending packets according to TCP/IP protocol standards in c

How compile the project

make

How run the project

to launch the ftp project you must pass it a folder where it will store the information exchanged and the packets (file received) and the port on which you want to listen

./myftp path port

How Work the project

The following are the FTP commands from client to server:

        USER <SP> <username> <CRLF>   : Specify user for authentication
        PASS <SP> <password> <CRLF>   : Specify password for authentication

        CWD  <SP> <pathname> <CRLF>   : Change working directory
        CDUP <CRLF>                   : Change working directory to parent directory

        QUIT <CRLF>                   : Disconnection

        DELE <SP> <pathname> <CRLF>   : Delete file on the server

        PWD  <CRLF>                   : Print working directory

        PASV <CRLF>                   : Enable "passive" mode for data transfer

        PORT <SP> <host-port> <CRLF>  : Enable "active" mode for data transfer


        HELP [<SP> <string>] <CRLF>   : List available commands

        NOOP <CRLF>                   : Do nothing

        (the following are commands using data transfer )

        RETR <SP> <pathname> <CRLF>   : Download file from server to client
        STOR <SP> <pathname> <CRLF>   : Upload file from client to server
        LIST [<SP> <pathname>] <CRLF> : List files in the current working directory 

Command-Reply Sequences

The server reply is defined to contain the 3-digit code, followed by Space , followed by one line of text, and terminated by the Telnet end-of-line code .

Example :

-> USER Username <- 331 User name okay, need password. -> PASS Password <- 230 User logged in, proceed.

-> : Request command from client to server <- : Reply from server to client

        Connection Establishment
           <- 220

        Login
           USER ->
              <- 230
              <- xxx
              <- 331
           PASS ->
              <- 230
              <- 332
              <- xxx
           CWD ->
              <- 250
              <- xxx
           CDUP ->
              <- 200
              <- xxx

        Logout
           QUIT ->
              <- 221
              <- xxx

        Transfer parameters
           PORT ->
             <- 200
             <- xxx
           PASV ->
             <- 227
             <- xxx

        File action commands
           STOR ->
              <- 150
                 <- 226
                 <- xxx
              <- xxx
           RETR ->
              <- 150
                 <- 226
                 <- xxx
              <- xxx
           LIST ->
              <- 150
                 <- 226
                 <- xxx
              <- xxx
           DELE ->
              <- 250
              <- xxx
           PWD ->
              <- 257
              <- xxx

        Informational commands
           HELP ->
              <- 214
              <- xxx

        Miscellaneous commands
           NOOP ->
              <- 200
              <- xxx

Numeric Order List of Mandatory Reply Codes (Extract)

     120 Service ready in nnn minutes.
     125 Data connection already open; transfer starting.
     150 File status okay; about to open data connection.
     200 Command okay.
     214 Help message.
         On how to use the server or the meaning of a particular
         non-standard command.  This reply is useful only to the
         human user.
     220 Service ready for new user.
     221 Service closing control connection.
         Logged out if appropriate.
     226 Closing data connection.
         Requested file action successful (for example, file
         transfer or file abort).
     227 Entering Passive Mode (h1,h2,h3,h4,p1,p2).
     230 User logged in, proceed.
     250 Requested file action okay, completed.
     257 "PATHNAME" created.
      
     331 User name okay, need password.
     332 Need account for login.