Browse Prior Art Database

File Transfer and Recovery (RFC0133) Disclosure Number: IPCOM000002152D
Original Publication Date: 1971-Apr-27
Included in the Prior Art Database: 2001-Oct-17
Document File: 5 page(s) / 8K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R.L. Sundberg: AUTHOR



This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 48% of the total text.

Network Working Group                                      R. L. Sunberg

Request for Comments: 133                             Harvard University

NIC 6710                                                   27 April 1971

[Categories C.4, C.5, C.6, D.4, D.7, D.7]



1A   Handshaking

   I think that Mr Bhushan(RFC #114, NIC 5823) is not strict enough in

   his concept of a transaction sequence.  Every transaction should

   prompt a response from its recipient (recall Kalin's crates --

   RFC #60, NIC 4762).  Control should pass back and forth until the

   server terminates.  The server _always_ gets the last word (more on

   error recovery later).

   Some sample interchanges are given.

       User                Server       Comments

       <...>       ==>                  Establish a connection

                   <==     <...>

       <I><...>    ==>                  Identify self

                   <==     <+>          Ok, ready

       <R><...>    ==>                  Retrieval request

                   <==     <rs>         I've got your file

       <rr>        ==>                  Send it

                   <==     <,><...>     Here's the first part

       <rr>        ==>                  Got it

                   <==     <+>          All done

       <S><...>    ==>                  Store request

                   <==     <rr>         Ok, go ahead

       <#><...>    ==>                  Here's some protection stuff

                   <==     <rr>         Ok

       <*><...>    ==>                  Here's the file

                   <==     <+>          Got it.  All done.

   See section 2B, below, for examples of error recovery.

Sunberg                                                         [Page 1]

RFC 133             File Transfer and Error Recovery          April 1971

1B  Extensions to the file transfer protocol

   The file transfer protocol needs a mechanism for accessing individual

   records of a file.  This will be particularly useful when very large

   data bases appear on the network.  The following definitions should

   be added to the protocol:

   The store(S) and retrieve(R) requests have the data field format

   <key>, where <key> has the syntax:

    <key>::=<devicename>RS<filename>US<keyname> | <filename>US<keyname>.

                           --          --                      --

   The <pathname> syntax is changed to:

       <pathname>::=<devicename> | <filename> | <pathname>RS<filename>.


   If a retrieve(R) request is given with a data field with <key>

   syntax rather than <pathname> syntax, then the returned data will

   consist of the record following the matching <key>.  If a store(S)

   request is given with a data field of <key> syntax, then the

   supplied data will replace the record following the matching

   <keyname>.  If the keyname does not exist, the record will be

   appended to the named file.  The individual installation must

   provide the linkage between the <keyname> and the record it


   In addition, the lookup(L) request will provide a list of keynames

   into a file (or the name of a file which contains the keynames).

   Transaction code F (request File directory) requests a listing of

   available files.  The data field of the F transaction is of the

   form:  <pathname>GS<pathname>GS...  All files in the server system

                    --          --

   which match one or more of the given <pathname> specifiers are

   listed in a return file.  The format of the data fields of this

   file is:  <pathname>GS<pathname>GS...  If a <pathname> field in

                       --          --

   the request transaction does not include a <name> field, the

   default is all files on the given device.  Some examples are given:

       <F><DC1 DSK[62,50]] GS JOE>

           ---             --

Sunberg                                                         [Page 2]

RFC 133             File Transfer and Error Recovery          April 1971

   This example requests a list...