File Transfer Protocol (FTP)

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Presentation transcript:

File Transfer Protocol (FTP) The standard mechanism provided by the Internet for copying a file from one host to another. The needs: - Different file name conventions Different representation of text and data Different directory structures 27-Oct-03 Application Layer

FTP (Continued…) Differs from other client-server applications in that it establishes two connections between the client and the server. They are: - Data connection Used for data transfer Consists of complex rules due to the variety of data being transferred Control connection Used for information control (commands and responses) Uses very simple rules of one line command or response at a time 27-Oct-03 Application Layer

FTP Model FTP client has three components User interface Client control process Client data transfer process FTP server has two components Server control process Server data transfer process 27-Oct-03 Application Layer

Figure 26.12 FTP

FTP Connections Control connection Maintained during the entire FTP session Uses port 21 Involves interactive connection between user and server Data connection Maintained only during a file transfer Uses port 20 27-Oct-03 Application Layer

FTP Communications Communication over control connection Uses ASCII character set, similar to SMTP Communication over data connection File type Data structure Transmission mode 27-Oct-03 Application Layer

Figure 26.13 Using the control connection

Figure 26.14 Using the data connection

File Transfer File transfer in FTP can mean one of the following three: - Storing a file Retrieving a file Retrieving a list Most operating systems provide user interface to access the services of FTP where the chosen activity is automatically converted by the interface to the corresponding FTP commands. 27-Oct-03 Application Layer

Figure 26.15 File transfer

Figure 26.16 Example 1

List of FTP commands in DOS

List of FTP commands in UNIX !, $, account, append, ascii, bell, binary, bye, case, cd, cdup, close, cr, delete, debug, dir, discount, form, get, glob, hash, help, lcd, ls, macdef, mdelete, mdir, mget, mkdir, mls, mode, mput, nmap, ntrans, open, prompt, proxy, sendport, put, pwd, quit, quote, recv, remotehelp, rename, reset, rmdir, runique, send, status, struct, sunique, tenex, trace, type, user, verbose,?

FTP Connection Example 27-Oct-03 Application Layer

GUI FTP Example 27-Oct-03 Application Layer