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Example of A Client and A Server

Example of A Client and A Server. An Example Service. Purpose Count times invoked Return printable ASCII message Connection-oriented protocol Sequential execution (not concurrent). An Example Client. Open TCP connection to server Iterate until end-of-file Receive text

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Example of A Client and A Server

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  1. Example of A Client and A Server

  2. An Example Service • Purpose • Count times invoked • Return printable ASCII message • Connection-oriented protocol • Sequential execution (not concurrent)

  3. An Example Client • Open TCP connection to server • Iterate until end-of-file • Receive text • Print characters received • Close connection • Exit

  4. Example Server • Create socket and put in passive mode • Iterate forever • Accept next connection, get new socket • Increment count and send text message • Close socket for connection • Notes • Main socket remains open • Server never exits

  5. Socket Calls In Client And Server • Client closes socket after use • Server never closes original socket

  6. Code For Client • Arguments to program • Host • Protocol port • Both optional • Many details • Minor incompatibilities among socket implementations • Unix • Microsoft • Use C #ifdef

  7. Example Client Code (1)

  8. Example Client Code (2)

  9. Example Client Code (3)

  10. Example Client Code (4)

  11. Example Client Code (5)

  12. Code For Server • Arguments to program • Protocol port • C language #ifdefs for socket variants

  13. Example Server Code (1)

  14. Example Server Code (2)

  15. Example Server Code (3)

  16. Example Server Code (4)

  17. Stream Interface • Sender • Calls send repeatedly • Specifies number of octets per call • TCP • Divides stream into segments • Receiver • Calls recv repeatedly • Receives one or more octets per call • Count of zero means ‘‘end of file’’ • Size received unrelated to size sent

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