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#Socket Programming Practice

  • File Transfer Server & Client
  • Ftp Client

File Transfer Server & Client

In this part, I implemented a pair of file transfer server and client without reading the ftp protocol, which turned out to be naive compared to the ftp. Still I learned much from this experience, about socket programming and pit falls.

Here is a brief introduction of my implementation.

Screenshot

screentshot

Commands

  • help
  • ls
  • cd remote-dir
  • append local-file [remote-file]
  • get remote-file [local-file]
  • delete remote-file
  • pwd
  • bye

The server starts on a specified port, waiting for the clients to connect. When clients successfully connect to the server, try the given commands to view, cd into or out of the server folders, to - upload or download the files, to - indicate the current working directory or delete files on the server, - or just say goodbye to the server.

####Here are some features supported:

  • Varied length of message delivery by indication with a prefix.
  • Multiple clients connection.
  • If necessary, create the base directory for the file transfer server.
  • Clients can never go out of the range of the base directory, spoiling the files on the server.
  • Show process of uploading and downloading.
  • Prompts for append/get commands.

Ftp Client

Currently a prototype, connecting to an existing ftp server.

Todo: fully-fledged ftp client.