rfc1184.txt

著名的RFC文档,其中有一些文档是已经翻译成中文的的.

    |      |     |        |       ^     | |     | |     |       | |
    |      |     |        v       |     v |     | |     v       | |
    |      |     |       / \      | *********** | | ########### | |
    |      |     |     /     \    | *  Send   * | | # Switch  # | |
    | ********** |Yes/ Same as \  | * 0,VAL,0 * | | # to      # | |
    | * Change * +--<  current? > | *********** | | # default # | |
    | * to new *     \         /  |             v | ########### | |
    | * value  *       \     /    |     ***********     |       | |
    | **********         \ /      |     *  Send   *     v       | |
    |      ^              |No     |     * 0,DEF,0 *  #########  | |
    |      |Yes           v       |     ***********  # Send  #--+ |
    |     / \            / \      |                  # SPC-A #    |
    |   /     \        /     \    |                  #########    |
    | / Is ACK  \ Yes/  Same   \  |                     ^         |
    |<  bit set? ><-<  level as > |                     |         |
    | \         /    \ current?/  |                 ###########   |
    |   \     /        \     /    |                 #   Get   #<--+
    |     \ /            \ /    +-+---+             # 0,VAL,0 #
    |      |No            |No   | Set |             ###########
    |      +--------------+     | ACK |
    |                     v     | bit |      * - Client side only
    |                    / \    +-----+      # - Server side only
    |   +------+       /     \      ^
    |   | Send |  No /  Do we  \ Yes|
    +---| SPC1 |<---<   agree?  >---+
        +------+     \         /
                       \     /
                         \ /

           SPC0    Initial setting for a special character
           SPC1    A changed special character < SPC0
           SPC-A   All current special character settings
           VAL     SLC_VALUE level
           DEF     SLC_DEFAULT level

   Levels: DEFAULT, VALUE, CANT_CHANGE, NOSUPPORT
   Flags: ACK



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RFC 1184                 Telnet Linemode Option             October 1990


           Receive                 Response
           -------                 --------
           f,SLC_DEFAULT,x         f,SLC_VALUE,v
                                   f,SLC_CANTCHANGE,v
                                   f,SLC_NOSUPPORT,x

           f,SLC_VALUE,v           f,SLC_ACK|SLC_VALUE,v
                                   f,SLC_CANTCHANGE,w
                                   f,SLC_NOSUPPORT,x

           f,SLC_CANTCHANGE,v      f,SLC_ACK|SLC_CANTCHANGE,v
                                   f,SLC_NOSUPPORT,x

           f,SLC_NOSUPPORT,x       f,SLC_ACK|SLC_NOSUPPORT,x

           x,SLC_ACK|x,x           no response

5.10 Examples of a connection

   In these examples, the symbolic names are used rather than the actual
   values, to make them readable.  When two or more symbolic names are
   joined by a |, it means that the actual value will be the logical
   "or" of the values of the symbolic names.  In the interest of
   clarity, for these examples the leading IAC and IAC SB sequences, and
   the trailing IAC SE sequences have been omitted.  Also, the SLC_
   prefix has been left off where ever it would normally occur.

   CLIENT                           SERVER
                                        DO TOGGLE-FLOW-CONTROL
                                        DO LINEMODE
       WILL TOGGLE-FLOW-CONTROL
       WILL LINEMODE
       [ Subnegotiation may now proceed in both directions.  The client
         sends of the list of special characters.  ]
       LINEMODE SLC SYNCH DEFAULT 0 IP
       VALUE|FLUSHIN|FLUSHOUT 3 AO
       VALUE 15 AYT DEFAULT 0 ABORT
       VALUE|FLUSHIN|FLUSHOUT 28 EOF
       VALUE 4 SUSP VALUE|FLUSHIN 26 EC
       VALUE 127 EL VALUE 21 EW VALUE
       23 RP VALUE 18 LNEXT VALUE 22
       XON VALUE 17 XOFF VALUE 19
       [ Now that linemode is enabled, the server sets the initial mode,
         and acknowledges the special characters.  ]
                                        LINEMODE MODE EDIT

                                        LINEMODE SLC SYNCH NOSUPPORT 0
                                        IP VALUE|FLUSHIN|FLUSHOUT|ACK 3



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RFC 1184                 Telnet Linemode Option             October 1990


                                        AO NOSUPPORT 0 AYT NOSUPPORT 0
                                        ABORT VALUE|FLUSHIN|FLUSHOUT|ACK
                                        28 EOF VALUE|ACK 4 SUSP NOSUP-
                                        PORT 0 EC VALUE|ACK 127 EL
                                        VALUE|ACK 21 EW VALUE|ACK 23 RP
                                        VALUE|ACK 18 LNEXT VALUE|ACK 22
                                        XON VALUE|ACK 17 XOFF VALUE|ACK
                                        19
       [ The client gets the mode and ack of the special characters, and
         acks the mode and any special characters that the server
         changed.  ]
       LINEMODE MODE EDIT|MODE_ACK

       LINEMODE SLC SYNCH NOSUPPORT|ACK
       0 AO NOSUPPORT|ACK 0 AYT|ACK
       NOSUPPORT 0 SUSP NOSUPPORT|ACK 0
                                        "Login:"
       "my_account"
       [ Turn off echo to the user.  ]
                                        WILL ECHO
       DO ECHO
                                        "Password:"
       "my_password"
       [ Turn back on echo to the user.  ]
                                        WONT ECHO
       DONT ECHO
       [ User does some stuff, and then runs an application that wants
         to use single character mode, doing its own echoing of
         characters, but keep signal trapping on.  ]
                                        WILL ECHO
       DO ECHO
                                        LINEMODE MODE TRAPSIG
       LINEMODE MODE TRAPSIG|MODE_ACK
       [ Application finishes ]
                                        WONT ECHO
       DONT ECHO
                                        LINEMODE MODE EDIT|TRAPSIG
       LINEMODE MODE
       EDIT|TRAPSIG|MODE_ACK
       [ Another application, that wants full control of everything.  ]
                                        WILL ECHO
       DO ECHO
                                        LINEMODE MODE 0
       LINEMODE MODE 0|MODE_ACK
       [ Application finishes ]
                                        WONT ECHO
       DONT ECHO
                                        LINEMODE MODE EDIT|TRAPSIG



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RFC 1184                 Telnet Linemode Option             October 1990


       LINEMODE MODE
       EDIT|TRAPSIG|MODE_ACK
       [ The user changes his erase character to ^H.  ]
                                        LINEMODE SLC EC VALUE 8
       LINEMODE SLC EC VALUE|ACK 8
       [ The user decides to revert to all the original client side
         special characters.  ]
       LINEMODE SLC SYNCH DEFAULT 0 IP
       VALUE|FLUSHIN|FLUSHOUT 3 AO
       VALUE 15 AYT DEFAULT 0 ABORT
       VALUE|FLUSHIN|FLUSHOUT 28 EOF
       VALUE 4 SUSP VALUE|FLUSHIN 26 EC
       VALUE 127 EL VALUE 21 EW VALUE
       23 RP VALUE 18 LNEXT VALUE 22
       XON VALUE 17 XOFF VALUE 19
                                        LINEMODE SLC SYNCH NOSUPPORT 0
                                        AO NOSUPPORT 15 AYT NOSUPPORT 0
                                        SUSP NOSUPPORT|FLUSHIN 26 EC
                                        VALUE|ACK 127 EW VALUE|ACK 23 RP
                                        VALUE|ACK 18 LNEXT VALUE|ACK 22
                                        XON VALUE|ACK 17 XOFF VALUE|ACK
                                        19
       LINEMODE SLC SYNCH NOSUPPORT|ACK
       0 AO NOSUPPORT|ACK 15 AYT
       NOSUPPORT|ACK 0 SUSP
       NOSUPPORT|ACK|FLUSHIN 26
       [ The user decides to import the remote sides default special
         characters.  ]
       LINEMODE SLC 0 DEFAULT 0
                                        LINEMODE SLC IP
                                        VALUE|FLUSHIN|FLUSHOUT 3 ABORT
                                        VALUE|FLUSHIN|FLUSHOUT 28 EOF
                                        VALUE 4 EC VALUE 127 EL VALUE 21
       [ Since these are the same as the current local settings, no
         response is generated.  ]
       [ This next example is what would happen if an editor was fired
         up, that wanted to let the client side do the echoing and
         buffering of characters, but did not want it to do any line
         editing, and only forward the data when got a control
         character.  Note that we have preceded all the the 0377s
         in the forward mask with an IAC.  ]
                                        LINEMODE MODE 0
                                        LINEMODE DO FORWARDMASK IAC 0377
                                        IAC 0377 IAC 0377 IAC 0377 0 0 0
                                        0 0 0 0 0 0 0 0 01
       LINEMODE MODE 0
       LINEMODE WILL FORWARDMASK
       [ Application runs to completion, and then things are to be set



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RFC 1184                 Telnet Linemode Option             October 1990


         back to what they were before.  ]
                                        LINEMODE MODE EDIT|TRAPSIG
                                        LINEMODE DONT FORWARDMASK
       LINEMODE MODE EDIT|TRAPSIG
       LINEMODE WONT FORWARDMASK

6.  Other Telnet options and RFCs

   The following is a list of RFCs for various Telnet options that
   should be supported along with LINEMODE.

   1.  Postel, J. and Reynolds, J., "TELNET PROTOCOL SPECIFICATION",
       RFC 854, ISI, May 1983.

   2.  Postel, J. and Reynolds, J., "TELNET OPTION SPECIFICATIONS",
       RFC 855, ISI, May 1983.

   3.  Postel, J. and Reynolds, J., "TELNET BINARY TRANSMISSION",
       RFC 856, ISI, May 1983.

   4.  Postel, J. and Reynolds, J., "TELNET ECHO OPTION", RFC 857,
       ISI, May 1983.

   5.  Postel, J. and Reynolds, J., "TELNET SUPRESS GO AHEAD OPTION",
       RFC 858, ISI, May 1983.

   6.  Postel, J. and Reynolds, J., "TELNET TIMING MARK OPTION",
       RFC 860, ISI, May 1983.

   7.  VanBokkeln, J., "Telnet Terminal-Type Option", RFC 1091,
       FTP Software, Inc., February 1989.

   8.  Waitzman, D., "Telnet Window Size Option", RFC 1073, BBN STC,
       October 1988.

   9.  Hedrick, C., "Telnet Remote Flow Control Option", RFC 1080,
       Rutgers University, November, 1988.

  10.  Hedrick, C., "Telnet Terminal Speed Option", RFC 1079, Rutgers
       University, December, 1988.

   The following is a list of RFCs that need not be supported for
   LINEMODE, but which would enhance any TELNET implementation.

  11.  Postel, J. and Reynolds, J., "TELNET STATUS OPTION", RFC 859,
       ISI, May 1983.

  12.  Postel, J. and Reynolds, J., "TELNET END OF RECORD OPTION",



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RFC 1184                 Telnet Linemode Option             October 1990


       RFC 885, ISI, December 1983.

  13.  Silverman, S., "OUTPUT MARKING TELNET OPTION", RFC 933,
       MITRE-Washington, January 1985.

  14.  Marcy, G., "Telnet X Display Location Option", RFC 1096,
       Carnegie Mellon University, March 1989.

Security Consideratiions

   Security issues are not discussed in this memo.

Author's Address

   David A. Borman
   Cray Research Inc.
   655F Lone Oak Drive
   Eagan, MN 55123

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

   IETF Telnet WG Mailing List: [e-mail]




























Telnet Working Group                                           [Page 23]