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RFC437 - Data Reconfiguration Service at UCSB

王朝other·作者佚名  2008-05-31
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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 RFCis 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

'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>

'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.

<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.

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.

'DIRECTORY' <formid> <CA>

Lists which component(s) of form <formid> exist. A complete form

consists of 'SOURCE', 'DIAGNOSTICS', and 'OBJECT_CODE' files.

'DISCONNECT' <CA> <CA>

Breaks the TELNET connection between DRS and the user and deletes the

user's DRS terminal. Any jobs the terminal has active are purged.

'FULLDUPLEX' <CA>

Directs DRS to echo user input; nullifies a previous

'LINE_AT_A_TIME' command.

'HALFDUPLEX' <CA>

Directs DRS not to echo user input nullifies a previous

'LINE_AT_A_TIME' command.

'HELP' <CA>

Lists the DRS control characters and their meanings.

'LINE_AT_A_TIME' <CA>

Tells DRS that the user is operating in line_at_a_time mode, and

nullifies a previous 'FULLDUPLEX' or 'HALFDUPLEX' command. DRS will

not send any output to the user while he is inputting commands.

'LINK' ('ENABLE''DISABLE'<tty list><CA>) <CA>

The link command may be used to enable or disable links to other

terminals, or to establish links between terminals.

'LINK' 'ENABLE' <CA> directs DRS to allow subsequent request by other

terminals to establish links with the user's terminal.

'LINK' 'DISABLE' <CA> directs DRS to refuse subsequent request by

other terminals to establish links with the user's terminal.

'LINK' (<tty list><CA>) <CA> requests DRS to establish bidirectional

links between the user's terminal and the terminals specified in <tty

list>. If <tty list> is omitted, DRS attempts to link the user's

terminal to all other active terminals. While the user's terminal is

linked to another terminal, all output to the user's terminal will

also be routed to the linked terminal, and all output to the linked

terminal will also be routed to the user's terminal. Unidirectional

links may be established via the 'MONITOR' and 'SELECT' commands.

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

Lists the contents of the <file type> file of form <formid>. <file

type> may be 'SOURCE', 'DIAGNOSTIC' or 'OBJECT_CODE', and defaults to

'SOURCE'.

'LOGIN' <userid> <password> <acct no.> <CA>

Logs the user in, enables job-oriented commands, and specifies the

account to which the use of DRS is to be billed. Currently billing

for DRS is not implemented, and <userid> and <acct no.> may be

arbitrarily chosen by the user. When billing for DRS is implemented,

user ID's and account numbers will be assigned and checked for

validity at login. The only currently acceptable <password> is

'ARPA'.

'LOGOUT' <CA>

Logs the user out and disables job-oriented commands and billing of

subsequent activity to the previously specified accounting

parameters. As with 'DISCONNECT', any jobs the terminal has active

are purged.

'MONITOR' (<tty list><CA>) <CA>

Requests DRS to establish unidirectional links between the user's

terminal and the terminals specified in <tty list>. If <tty list> is

omitted, DRS attempts to link the user's terminal to all other active

terminals. While the user's terminal is monitoring another terminal,

all output to that terminal will also be routed to the user's

terminal.

'QUIT' (<job name><CA>) <CA>

Requests DRS to purge the job (request for compilation or

interpreting) identified by <job name>. If <job name> is omitted,

all active jobs are purged.

'RADIX' <base> <CA>

Allows the user to specify the radix to be used for subsequent

integer display. <base> may be 'OCTAL', 'DECIMAL', or 'HEXADECIMAL'.

The default display radix is decimal.

'RENAME' <formid> ["TO'] <formid> <CA>

Allows the user to rename a form. The names of all components of the

form specified by the first <formid> are changed to correspond to the

second <formid>. If the form specified by the second <formid>

already exists, no change of name occurs, and the user is notified.

'RESPONSE' ('ALL''HANDHOLD''PROMPT''NORMAL''UNUSUAL' 'ERRORS'

'NONE') <CA>

Allows the user to specify the level of messages the system should

provide. The default response level is 'ALL'.

'RUN' <job name> ('SIMPLEX' <run parameters>'DUPLEX' '(' <run

parameters> <run parameters> ')') <CA>

Causes DRS to establish the requested Network connections and direct

the DRS interpreter to apply the specified form(s) to data passing

over the connections. The user first specifies the job name by which

his request will be identified, and second whether simplex or duplex

Network connections are to be established. 'SIMPLEX' implies that a

single unidirectional message path is to be employed, and requires

one set of <run parameters>. 'DUPLEX' implies that two message paths

will be employed are requires two sets of <run parameters>. < run

parameters> specify the data necessary to establish a Network

connection, time limits for the DRS interpreter, and the form which

is to be applied to the Network data stream.

<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>

Three methods are available for establishing Network connections:

'SICP', 'UICP', and 'RFC'. 'SICP (Server Initial Connection Protocol)

and 'UICP' causes DRS to simulate a server process addressable

through socket <socket number> at UCSB and wait for a user process to

connect to it. 'UICP' directs DRS to simulate a user process and

connect to the server addressable through Host <hostid>, socket

<socket number>. 'RFC' directs DRS to connect directly to the two

sockets specified. In the case of 'RFC', one of the two sockets

specified must be a send socket, and the other must be a receive

socket. <hostid> defaults to the Host from which the user logged into

the DRS/TSS.

The remaining fields in <run parameters> are defined as follows:

'BYTE_SIZE' <integer> specifies the byte size to be used, and

defaults to 8.

'CONNECT_TIME' <integer> specifies the amount of time, in seconds,

that DRS should wait for the connection to

be established. The default value is 30

seconds.

'RUN_TIME' <integer> specifies the maximum amount of time, in

seconds, that DRS interpreter will be

allowed to execute. The default value for

'RUN_TIME' is five minutes.

<formid> specifies the form which is to be applied

to the Network data stream.

For each instance of <run parameters>, one socket pair is allocated

and one form is specified. In the case of 'SIMPLEX' runs, the

Network data flows between these two sockets, with the form being

applied to the data. In the case of 'DUPLEX' runs, the connections

are somewhat more complex. For 'DUPLEX' runs, two sets of <run

parameters> are specified, causing two socket pairs to be allocated,

and two forms to be specified. Call these send socket 1, receive

socket 1, and form 1 (established via the first set of <run

parameters> and send socket 2, receive socket 2, and form 2

(established via the second set of parameters). When interpreting

begins, data will flow from send socket 1, through form1, to receive

socket 2, and from send socket 2, through form 2, to receive socket

1. (Note that without this socket switching, processes would be

connected to themselves when 'SICP' or 'UICP' is specified.)

The user is notified when his requests for connections are initiated

and when the interpreter begins applying a form to a connection.

When execution of a form terminates, the user is supplied with a

diagnostic message provided by the interpreter as well as the actual

run time of the interpreter.

'SELECT' (<tty list><CA>) <CA>

Requests DRS to establish unidirectional links between the user's

terminal and the terminals specified in <tty list>. If <tty list> is

omitted, DRS attempts to link the user's terminal to all other active

terminals. While the user's terminal has another terminal selected,

all output to the user'S terminal will also be routed to the selected

terminal.

';' <text> <CA>

Allows the user to enter any comments he chooses. <text> may include

the characters '?', and '.'. Note that <CA> must be CR-LF, rather

than period.

[This RFCwas put into machine readable form for entry]

[into the online RFCarchives by Helene Morin, Via Genie, 12/1999]

 
 
 
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