rfc437.txt

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Network Working Group                                            E. Faeh
Request for Comments: 437              Computer Systems Laboratory, UCSB
NIC: 13701                                                  30 June 1973


                  DATA RECONFIGURATION SERVICE AT UCSB

   This purpose of this RFC is to announce the availability of the Data
   Reconfiguration Service (DRS) at UCSB, and to describe the use of the
   DRS Time Sharing System.  The DRS is an experiment in a flexible
   means for reformatting Network data streams.  The DRS provides a
   means for coupling processes with different input/output interfaces,
   and carrying out user specified transformations on the data passing
   between them.  Samples of representative uses of the DRS include
   field insertion, field deletion, variable length string processing,
   string length computation, field transposition, character packing and
   unpacking, and character set translations.

   To use the DRS, a user first defines a "form", or a description of
   the reformatting to be performed on data passing between two sockets
   (a form is associated with each unidirectional message path).  DRS
   may then be directed to establish Network connections with the two
   processes involved and to monitor the dialogue between them.  DRS
   receives an input stream from one process, reformats the input
   according to the rules specified by the form, and emits the
   reformatted data as an output stream to the second process.  The two
   processes communicate as if they were directly connected to each
   other.

   Three major components comprise the DRS: a compiler which reduces DRS
   source programs (forms) to a simpler, machine independent instruction
   sequence (object program), an interpreter which executes the object
   program created by the compiler, and an executive program, the DRS
   Time Sharing System, which interfaces the Network user to the DRS.
   Detailed descriptions of the DRS source language and compiler are
   available in the following documents:

      "The Data Reconfiguration Service--An Experiment in Adaptable,
      Process/Process Communications", The Rand Corp., R-860-ARPA,
      November 1971.

      "Data Reconfiguration Service Compiler: Communications Among
      Heterogeneous Computer Centers Using Remote Resource Sharing", The
      Rand Corp.,R-887-ARPA, April 1972.

   The DRS Time Sharing System (DRS/TSS) and its server Telnet are
   currently available and addressable through socket 1281 decimal.
   DRS/TSS interfaces the user to the DRS.  In addition to a subset of



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RFC 437           DATA RECONFIGURATION SERVICE AT UCSB         June 1973


   'TENEX-like' executive commands, commands are available for creating
   and storing forms by name, and for invoking the DRS compiler or
   interpreter.  Since both the compiler and the interpreter run
   asynchronously to the DRS/TSS, the user is notified when execution of
   his requests for compilations or interpreting are initiated and
   terminated.  In addition, a diagnostic message is supplied by the
   interpreter whenever it terminates execution of a form.

   When a user connects to DRS/TSS he is allocated an internal TTY
   number by which his terminal is identified.  When the user issues a
   command to invoke the compiler or interpreter, his TTY number and a
   user specified job name are used to uniquely identify the request.
   The jobname is thereafter used to refer to the request.  A Network
   host is specified by host name, or by host number preceded by #.  A
   socket number is specified as an integer, optionally preceded by a
   (decimal) to indicate the radix used.  Decimal is the default radix
   and positive the default sign.  A negative socket number is
   maintained in two's complement form.

   The following control characters are recognized by DRS.  Control A
   (SOH) or rubout (DEL) delete the last character, control V (SYN)
   deletes the last word, control W (ETB) deletes the last phrase, and
   control X (CAN) deletes the entire line.  Control D (EOT) displays
   the current word, control E (ENQ) displays the current phrase, and
   control F (ACK) displays the entire line.  Control Y (EM) displays
   the name of the current phrase.  Command accept is carriage return-
   line feed, or period.  A space will force recognition of the current
   word, and '?' will list the input(s) currently possible.

   The following sections describe the DRS/TSS command syntax. <CA>
   denotes command accept, and brackets [] denote optional information.
   All literal information is enclosed in quotes ''.  Choose one
   alternative form items in parenthesized lists separated by |.

DRS/TSS COMMAND SYNTAX

Commands:

'ATTACH'          <tty no.> <password> <CA>
'BREAK'           (<tty list>|<CA>) <CA>
'COMPILE'         <job name> <formid> <CA>
'CONVERT'         <integer> ['TO'] <base> <CA>
'DEFINE'          <formid> <CA>
'DELETE'          [<file type>] <formid> <CA> <CA>
'DETACH'          <CA> <CA>
'DIRECTORY'       <formid> <CA>
'DISCONNECT'      <CA> <CA>
'FULLDUPLEX'      <CA>



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RFC 437           DATA RECONFIGURATION SERVICE AT UCSB         June 1973


'HALFDUPLEX'      <CA>
'HELP'            <CA>
'LINE_AT_A_TIME'  <CA>
'LINK'            ('ENABLE'|'DISABLE'|<tty list>|<CA>) <CA>
'LIST'            [<file type>] <formid> <CA>
'LOGIN'           <userid> <password> <account number> <CA>
'LOGOUT'          <CA>
'MONITOR'         (<tty list>|<CA>) <CA>
'QUIT'            (<job rename>|<CA>) <CA>
'RADIX'           <base> <CA>
'RENAME'          <formid> ['TO'] <formid> <CA>
'RESPONSE'        ('ALL'|HANDHOLD'|'PROMPT'|'NORMAL'|'UNUSUAL'|
                    'ERRORS'|'NONE') <CA>
'RUN'             <job name> ('SIMPLEX' <run parameters>|
                    'DUPLEX' '('<run parameters> <run parameters>
                    ')' ) <CA>
'SELECT'          (<tty list>|<CA>) <CA>
';'               <text> <CA>

Substitutions:

<formid> = ['<' <userid> ',' <password> '>'] <form name>
<base> = ('DECIMAL'|'HEXADECIMAL'|'OCTAL')
<file type> = ('DIAGNOSTICS'|'OBJECT_CODE'|'SOURCE')
<run parameters> = ('SICP' <socket number>|'UICP'
                   [<hostid>] <socket number>|'RFC'[<hostid>]
                   <socket number> [<hostid>] <socket number>)
                   ['BYTE SIZE' <integer>] ['CONNECT_TIME'
                   <integer>] ['RUN_TIME' <integer>] <formid>

Definitions:

<acct no>                   Account number is a character string whose
                            maximum length is 4.

<form name>                 Form name is a character string whose
                            maximum length is 6, and whose first
                            character is alphabetic.

<hostid>                    Host number preceded by '#' or host name
                            may be used to specify a Network host.

<integer>                   Integers may optionally be preceded by a
                            plus or minus sign, and by an H or X
                            (hexadecimal), 0 (octal), or D (decimal)
                            to specify the radix used. Decimal is
                            the default radix and positive the default
                            sign.



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RFC 437           DATA RECONFIGURATION SERVICE AT UCSB         June 1973


<job name>                  Job name is a character string whose
                            maximum length is 6, and whose first
                            character is alphabetic.

<password>                  The currently acceptable password is
                            'ARPA'.

<socket number>             Socket numbers are specified as <integer>
                            (see above).

<tty list>                  TTY List is one or more TTY numbers,
                            separated by commas.


<tty no.>                   TTY number is an integer representing a
                            DRS terminal identification number.


<userid>                    User ID is a character string whose
                            maximum length is 8, and whose first
                            character is alphabetic.

Command Descriptions:

   'ATTACH' <tty no.> <password> <CA>

   Connects the user's console to the DRS/TTS terminal with
   identification number <tty no.>. Terminal <tty no.> must have been
   previously detached, and must not have been deleted. (Currently,
   detached terminals are deleted after 1 hour.)

   'BREAK' (<tty list>|<CA>) <CA>

   Causes links to the terminals specified in <tty list> to be broken.
   If <tty list> is not specified, all established links are broken.
   (See 'LINK', 'MONITOR', and 'SELECT' for a description of how links
   are established.)

   'COMPILE' <job name> formid> <CA>

   Causes form <formid> to be compiled.  Verification that the source
   for form <formid> exists, and that object code does not already exist
   is made before invoking the DRS Compiler, which executes
   asynchronously to the user's terminal.  The DRS Compiler generates a
   diagnostic file for the form and, if no errors are encountered,
   object files. <job name> is used to identify the request and may not
   be used to identify any other job so long as the current request is
   outstanding.



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RFC 437           DATA RECONFIGURATION SERVICE AT UCSB         June 1973


   Because of main storage requirements, only one compilation is allowed
   in execution at any time.  Subsequent requests are queued for later
   execution unless the request queue is full, in which case the request
   is refused.  The user is notified when his compilation is initiated,
   and when it terminates.

   'CONVERT' <integer> ['TO'] <base> <CA>

   Allows the user to convert octal, decimal, or hexadecimal integers
   from one radix to another. <base> specifies the desired radix of the
   result and may be 'OCTAL', DECIMAL', or 'HEXADECIMAL'.

   'DEFINE' <formid> <CA>

   Allows the user to define a new source form, or append to an existing
   source form.  The new line indicator '$$' replaces the normal '$' to
   indicate that input will be used to define the source form.  Control
   C (ETX) signals the end of form definition and elicits the normal '$'
   new line indicator.

   Unfortunately, the current facilities for editing forms are extremely
   limited.  Only the line currently being entered may be edited.  Once
   a line has been terminated, with CR-LF, and the new line indicator
   has appeared, the line may not be edited.  The following control
   characters may be used to edit a form while it is being defined.
   Control A (SOH) or Rubout (DEL) delete the last character, control X
   (CAN) deletes the entire line, and control F (ACK) displays the
   entire line.  If modifications need to be made to lines other than
   the current line, the entire form must be deleted and reentered.

   'DELETE' [<file type>] <formid> <CA>

   Deletes the specified component file(s) of form <formid>. <file type>
   specifies the component file to be deleted, either 'SOURCE',
   'DIAGNOSTIC', or 'OBJECT_CODE'.  If <file type> is not specified, all
   components of the form are deleted.

   'DETACH' <CA> <CA>

   Breaks the TELNET connection between DRS and the user, but does not
   delete the user's DRS terminal for some fixed period of time,
   currently 1 hour.  Any jobs the terminal has active are unaffected
   when the terminal is detached.  The user may subsequently reconnect
   to his DRS terminal by using the 'ATTACH' command.







Faeh                                                            [Page 5]