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   (ALTODOCS)FTPPACKAGE.TTY;6      THU 17-NOV-77 4:45PM              PAGE 1


              For Xerox Internal Use Only -- November 17, 1977

Pup FTP Package              October 24, 1977                                 1




                     Pup File Transfer Protocol Package



This package is a collection of modules implementing the Pup File
Transfer Protocol. The package is used by the FTP subsystem and the
Interim File System and runs on Altos and Novas.


1. Overview

This document is organized      as a general overview         followed by
descriptions of each of the modules in the package.          A history of
revisions to the package is included at the end.
Before beginning the main    documentation, some general comments     are in
order.
     a. The File Transfer Protocol is (alas) complex; this package
     requires the Pup package and all of its supporting packages plus
     some other packages not specific to Pup. This docUmentation is
     less tutorial than normal Alto package descriptions so you should
     be prepared to consult its author.
     b. This document describes the external program interfaces for a
     particular implementation of the File Transfer Protocol, and does
     not deal with the internal implementation nor the reasons for
     design choices in the protocol or this implementation. Before
     considering the details     of this package, you      should read
     (Pup>FtpSpec.ears to get the flavor of how the File Transfer
     Protocol works. The  directory also contains descriptions of
     the lower level protocols on which FTP is based. Detailed
     knowledge of these protocols is not necessary to use this package,
     but you must be familiar with the operation of the Pup package.
     c. This package and the protocol are under active      development so
     users should expect modifications and extensions.
    d. This package is designed to run on both Altos and Novas, under
    several operating    systems and    with several    file systems.
    Functions   are   carefuly   split   into   protocol-specific and
    environment-specific modules. This package provides the protocol
    modules; you must write the matching environment-specific modules.

1.1. Organization
The FTP package comes in four modules: Server, User, Utilities, and
Property lists. The utility and property list modules are shared by
the User and Server.
The User and Server modules implement      their respective halves    of the
protocol exchanges.
   FTPPACKAGE.TTY;6      THU 17-NOV-77 4:45PM              PAGE 2


              For Xerox Internal Use Only -- November 17, 1977
Pup FTP Package               October 24, 1977                                2




and Server FTPs through the network byte stream, their form is defined
by protocol as a parenthesized list.         When passed between these
protocol modules and 

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