rfc1921.txt

<VC++网络游戏建摸与实现>源代码

   This message is used to purge the current screen copy request
   message. When the "TNVIP server" or the "TNVIP client" receives this
   message, if it has not already acknowledged the request message, it
   returns a screen copy purge acknowledgement message. If it has
   already replied, it ignores and deletes the message.

   The following command value is defined as:

    <CDE> = PURGE indication = 40 (0x28).There is no parameter field.

9. The TM attention

   The TM attention is the signal used to activate the local dialog of
   the DSA Terminal Manager.

   The Telnet Abort Output (AO) command [1] is the mechanism used to
   implement the TM attention key support in TNVIP.

   IAC AO (0xFF 0xF5)

   In order to implement the TM attention key support, "TNVIP clients"
   should provide a key (or combination of keys) that is identified as
   mapping to the TM attention key. When the user presses this key(s),



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RFC 1921                     TNVIP Protocol                   March 1996


   the "TNVIP client" should transmit a Telnet AO command to the "TNVIP
   server".

   Upon receipt of the AO command, a "TNVIP server" that implements the
   DSA Terminal Manager should enter in what will be loosely termed "TM
   Local Dialog", suspending the eventual DSA host connection, else it
   should simply ignore it.

10. The Break Key

   Generally, there is no break key on the real VIP terminal. The break
   signal is transmitted to the host application through a TM local
   dialog command ($*$BRK for example)

   On "TNVIP client" emulating VIP terminal, it is often possible to map
   the break signal on a special key combination or by other way (using
   mouse ...).

   The Telnet Break (BRK) command [1] is used to map the Break signal of
   the TNVIP.

   IAC BRK (0xFF 0xF3)

11. The Logout Key

   The Telnet Interrupt Process (IP) command [1] can be used to map the
   logout command of the TM Local Dialog ($*$LO for example) if it is
   implemented on the "TNVIP server".

   IAC IP (0xFF 0xF4)

12. TNVIP messages list

   All the TNVIP commands are summarized here after (and the values are
   given in hexadecimal).

12.1 Screen Flow

   Data request (allowed in the two ways)

    SCREEN DATA-REQ <FC1> <FC2> STX [<screen-data>]  IAC EOR
    60     01       <FC1> <FC2> 02  [<screen-data>]  FF  EF

    - Allowed responses to the screen Data request.

      SCREEN ACK  IAC EOR
      60     0A   FF  EF




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      SCREEN ERROR  IAC EOR
      60     0E     FF  EF

      SCREEN BUSY  IAC EOR
      60     12    FF  EF

      SCREEN ABORTED  IAC EOR
      60     16       FF  EF

      SCREEN PURGED  IAC EOR
      60     1A      FF  EF

   Password request (only from the "TNVIP server" to the "TNVIP client")

    SCREEN PASSW-REQ <FC1> <FC2> STX [<screen-data>]  IAC EOR
    60     05        <FC1> <FC2> 02  [<screen-data>]  FF  EF

    - Allowed responses to the password request.

      SCREEN ACK  IAC EOR
      60     0A   FF  EF

      SCREEN ERROR  IAC EOR
      60     0E     FF  EF

      SCREEN BUSY  IAC EOR
      60     12    FF   EF

      SCREEN ABORTED  IAC EOR
      60     16       FF  EF

      SCREEN PURGED  IAC EOR
      60     1A      FF  EF

   Local state request (only from the "TNVIP client" to the "TNVIP
   server").

    SCREEN LOCAL-ST IAC EOR
    60     2D       FF  EF

    - Allowed responses to the Local state request.

      SCREEN ACK  IAC EOR
      60     0A   FF  EF

      SCREEN PURGED  IAC EOR
      60 1A FF EF




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   Responses to request violating the TNVIP protocol (allowed in the two
   ways)

    SCREEN NOT-AVAIL  IAC EOR
    60     0E         FF  EF

    SCREEN PROT-VIOL  IAC EOR
    60     22         FF  EF

    SCREEN UNKN-CDE  IAC EOR
    60     26        FF  EF

   Indications (allowed in the two ways)

    SCREEN DATA-IND <FC1> <FC2> STX [<screen-data>]  IAC EOR
    60     00       <FC1> <FC2> 02  [<screen-data>]  FF  EF

    SCREEN PURGE  IAC EOR
    60     28     FF  EF

   Password indication (only from the "TNVIP server" to the "TNVIP
   client").

    SCREEN PASSW-IND <FC1> <FC2> STX [<screen-data>]  IAC EOR
    60     04        <FC1> <FC2> 02  [<screen-data>]  FF  EF

   On line state indication (only from the "TNVIP client" to the "TNVIP
   server").

    SCREEN ONLINE-ST  IAC EOR
    60     30         FF  EF

12.2 Printer flow

   Data request (only from the "TNVIP server" to the "TNVIP client")

    PRINTER DATA-REQ <FC1> <FC2> STX [<printer-data>]  IAC EOR
    68 01 <FC1> <FC2> 02 [<printer-data>] FF EF

    - Allowed responses to the printer data request.

      PRINTER ACK [<status>]  IAC EOR
      68      0A  [<status>]  FF  EF

      PRINTER ERROR  [<status>] IAC EOR
      68      0E     [<status>] FF  EF





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      PRINTER BUSY [<status>]  IAC EOR
      68      12   [<status>]  FF  EF

      PRINTER ABORTED  [<status>] IAC EOR
      68      16       [<status>] FF  EF

      PRINTER PURGED  [<status>] IAC EOR
      68      1A      [<status>] FF  EF

      PRINTER NOT-AVAIL  [<status>] IAC EOR
      68      1E         [<status>] FF  EF

   State request (only from the "TNVIP server" to the "TNVIP client")

    PRINTER STATE-REQ  IAC EOR
    68      35         FF  EF

    - Allowed responses to the state request.

      PRINTER READY  IAC EOR
      68      3A     FF  EF

      PRINTER STANDBY  IAC EOR
      68      3E       FF  EF

      PRINTER PURGED  IAC EOR
      68      1A      FF  EF

      PRINTER NOT-AVAIL  IAC EOR
      68      1E         FF  EF

   Responses to request violating the TNVIP protocol (allowed in the two
   ways)

    PRINTER PROT-VIOL  IAC EOR
    68      22         FF  EF

    PRINTER UNKN-CDE  IAC EOR
    68      26        FF  EF

   Indication (only from the "TNVIP server" to the "TNVIP client")

    PRINTER PURGE  IAC EOR
    68 28 FF EF







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RFC 1921                     TNVIP Protocol                   March 1996


12.3 Screen Copy Printing messages flow

   Copy request (only from the "TNVIP client" to the "TNVIP server")

    SCPM COPY-REQ  IAC EOR
    69   41        FF  EF

    - Allowed responses to the copy request (from the "TNVIP server" to
      the "TNVIP client")

      SCPM  ERROR  <reason> IAC EOR
      69    0E     <reason> FF  EF

      SCPM  PURGED  IAC EOR
      69    1A      FF  EF

      SCPM  NOT-AVAIL  IAC EOR
      69    1E         FF  EF

      SCPM  LOCAL-COPY-RQ   IAC EOR
      69    47              FF  EF

   Local copy request (only from the "TNVIP server" to the "TNVIP
   client" )

    SCPM  LOCAL-COPY-RQ   IAC EOR
    69    47              FF  EF

    - Allowed responses to the local copy request (from the "TNVIP
      client" to the "TNVIP server").

      SCPM ACK  IAC EOR
      69   0A   FF  EF

      SCPM ERROR  IAC EOR
      69   0E     FF  EF

      SCPM BUSY IAC EOR
      69   12   FF  EF

      SCPM ABORTED IAC EOR
      69   16      FF  EF

      SCPM PURGED IAC EOR
      69   1A     FF  EF

      SCPM NOT-AVAIL IAC EOR
      69   1E        FF  EF



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   Data request. (only from the "TNVIP client" to the "TNVIP server")

    SCPM DATA-REQ <FC1> <FC2> STX [<screen-data>]  IAC EOR
    69   01       <FC1> <FC2> 02  [<screen-data>]  FF  EF

   - Allowed responses to the data request

      SCPM ACK  IAC EOR
      69   0A   FF  EF

      SCPM PURGED IAC EOR
      69   1A     FF  EF

      SCPM NOT-AVAIL IAC EOR
      69   1E        FF  EF

   Responses to request violating the TNVIP protocol (allowed in the two
   ways)

    SCPM PROT-VIOL  IAC EOR
    69   22         FF  EF

    SCPM UNKN-CDE  IAC EOR
    69   26        FF  EF

    Indications (allowed in the two ways)

    SCPM DATA-IND <FC1> <FC2> STX [<screen-data>]  IAC EOR
    69   00       <FC1> <FC2> 02  [<screen-data>]  FF  EF

    SCPM PURGE  IAC EOR
    69   28     FF  EF

13.  Security Considerations

   Security issues are not addressed in this document.  It is
   anticipated that once authentication mechanisms have become well
   established, use of them can be made by TNVIP.  One of the important
   uses of authentication would be to answer the question of whether or
   not a given user should be allowed to "use" a specific terminal.











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14. References

   [1] Postel, J., and J. Reynolds, "Telnet Protocol Specification", STD
       8, RFC 854, USC/Information Sciences Institute, May 1983.

   [2] "Communications. MainWay. Terminal Management. DNS-E",
       Ref : 39A213EB Rev00, BULL S.A.

   [3] VanBokkelen, J., "Telnet Terminal-Type Option", RFC 1091, FTP
       Software, Inc., February 1989.

   [4] Postel, J., "Telnet End of Record Option", RFC 885,
       USC/Information Sciences Institute, December 1983.

   [5] Postel, J., and J. Reynolds, "Telnet Binary Transmission", STD
       27, RFC 856, USC/Information Sciences Institute, May 1983.

   [6] Postel, J., and J. Reynolds, "Telnet Suppress Go Ahead Option",
       STD 29, RFC 858, USC/Information Sciences Institute, May 1983.

   [7] "Affinity V2. DKU7107 Reference Manual"
       Ref : 40 A2 23 WA, BULL S.A.

   [8] "Affinity V2. VIP7800 Reference Manual"
       Ref : 40 A2 24 WA,  BULL S.A.

   [9] "Bull Questar 200. TCS 7424 et TCS 7434. Transmission de donnees.
       Manuel de  reference"
       Ref : 80 F2 41DC Rev0,  BULL S.A.

15. Author's Address

   Jean-Yves Dujonc
   BULL S.A.
   rue Jean Jaures
   78340 Les Clayes-sous-Bois
   France

   Phone: [phone]
   Fax:   [phone]
   EMail: [e-mail]










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