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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.
The Property List module generates and parses property lists,
filesystem-independent descriptions of files. \,Jllen passed between User
tL
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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