![]() Based on the type of input, we get the corresponding output from the server. Variable ” io ” stores our user input (either of LIST,PUT,GET). It is done by binding the IP address and PORT no to a socket object -> “st”. ![]() This implementation is not using any FTP libraries.Īrguments : Command line arguments (IP address and PORT no)įirst the client connects to the server using the IP address and PORT no of the server. Please click here to check out my implementation (written in Python) in my repository. I didn’t used any libraries while doing it in C, I just used the normal popen() function which stores the stdout in a buffer and sends it back to the requested client. So I did the functionality of LIST command alone in C and the other commands such as GET and PUT using Python sockets. Initially I thought of doing it in C, but I am not able to implement all the commands successfully. We can implement the protocol in different programming languages and there are FTP libraries available for them. LIST command is used to retrieve the contents from a directory, GET command is used to download a file from Server to Client and PUT command is used to store a file from Client machine to the Server machine.FTP even offers FTPS for the secure transmission of files using SSL/FTP libraries. ![]() Data transfer happens with the help of limited commands LIST,GET, and PUT. Once if the server validates your credentials and if it is True then the FTP server in response creates a data connection with the client from it’s PORT 20. Since it is a control connection, here we will provide our user credentials for logging into the server. A typical FTP process works like this: Once if you want to transfer or download a file from a server, the client will make a TCP control connection to the server’s PORT 21 which will remain open during the transfer process. We actually use this protocol to transfer files either from client to server and vice versa. It uses separate connections for Authentication and for file transfer. FTP stands for File Transfer protocol and it is built on a client server architecture. And since it is our first assignment, the tasks were pretty simple and just to consider implementing very few of the FTP commands: LIST,GET, and PUT. As part of my networking lab assignment I am given a task to implement the FTP protocol using TCP libraries.
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