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Lars Brinkhoff 9ecce608ba DFTP - Datacomputer file transfer.
2019-01-28 17:39:35 +01:00

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Computer Corporation of America
Datacomputer File Transfer Program User's Guide
November 1976
î
Overviewî ________
The Datacomputer is a shared large-scale data base utility
offering data storage and data management services to other
computers on the Arpanet. The system is intended to be used as a
centralized facility for archiving data, for sharing data among
various network hosts, and for providing inexpensive on-line
storage for sites needing to supplement their local capability.
The Datacomputer is implemented on dedicated hardware, and
comprises a separate computing system specialized for data
management. Logically, the system can be viewed as a closed box
shared by multiple external processors and accessed in a standard
notation called Datalanguage.
The Datacomputer File Transfer Program (DFTP) is a
user-invoked program that stores and retrieves local files on the
Datacomputer. DFTP translates simple user commands into
Datalanguage, sends the Datalanguage and data to the
Datacomputer, processes the messages and data returned from the
Datacomputer, and notifies the user of the results. DFTP also
manages local file input/output and secondary network connections
to and from the Datacomputer.
The Directoryî _____________
The DFTP Datacomputer directory is a tree, with site nodes
anchored to a common root node, user nodes subordinate to site
nodes, optional subdirectories of arbitrary depth and breadth
beneath user nodes, and user files stored in special leaf nodes
(called '<FILES>' nodes). Pictorially,
<ROOT>
/ \
SITE SITE ...
/ \
USER USER ...
/
<FILES> SUBDIRECTORY ...
/ \
<FILES> SUBDIRECTORY ...
\
<FILES> ...
The <FILES> nodes are the repositories of all data. The
user files they contain are not known individually to the
Datacomputer (unlike nodes), but are separate entities only to
DFTP. There can be only one <FILES> node directly under any
given user or subdirectory node. DFTP users do not reference a
<FILES> node directly; a reference to a file under a specific
user or subdirectory node is expanded into a reference to that
î
DFTP User's Guide 2
file in the <FILES> node under the specified node. (If a node is
not specified a default is supplied).
There are two basic types of commands -- those that
reference only nodes and those that reference user files. Node
level commands operate at the global level of sites, users, and
subdirectories. File level commands operate at the local level
(inside a <FILES> node) storing, retrieving, and modifying data
within that node. The argument to a file level command can
consist only of a file name, or of a file name preceded by a node
argument (such as the node level commands take).
Referencing Nodesî _________________
The mechanism for referencing a node, called a node path,
consists of a context and a node list. A context is an anchoring
point for node name references (indicated by one, two, or three
left-angle-brackets); if none is specified, DFTP supplies a
default. A node list is a sequence of node names, starting from
the anchor, defining the desired branch of the directory tree.
There are three contexts, TOP, ATTACH, and CONNECT.
1. The top context ('<<<') anchors the node path at the
root node and is used primarily for referencing other
site and user nodes.
2. The attach context ('<<') is a node path, set by the
ATTACH command (and by DFTP automatically at the
beginning of a session), and usually indicates a user
node. It is used mainly as a reference point for name
space division beneath the user node.
3. The connect context ('<') is a node path (initially the
same as the attach context), set by the CONNECT command,
and conventionally indicates a user node or
subdirectory.
A node list consists of a sequence of node names
(consecutive levels in the tree) separated by right angle
brackets. A password may be necessary in acquiring access
privileges at a particular node, in which case the node name is
followed by a colon and the password. Sets of nodes can be
referenced -- all nodes at a particular level are indicated by
'*', and all inferior nodes are designated by '**' (which can
occur only at the end of the node list).
î
DFTP User's Guide 3
For example,
<<<CCA>HACKER:>WALDO
Starting at the top context, the node path references the
subdirectory WALDO under user HACKER at site CCA (with a password
supplied to gain access to HACKER).
<<WALDO>**
Starting at the attach context, the node path references the
subdirectory WALDO and all inferior nodes (note that WALDO is
included -- the REMOVE command, for example, would delete the
node WALDO as well as its inferiors).
Referencing Filesî _________________
User file names have the same form as TENEX file names: a
file designation, an optional extension, and an optional version
number. The file designation is separated from the extension by
a period, and the extension from the version number by a
semicolon. File sets may be indicated by an asterisk in any or
all of the file designation, extension, and version number
fields.
Version numbers allow unambiguous reference of files with
the same file designation and extension. Each file has a version
number assigned to it by DFTP (which is unrelated to its TENEX
version number) -- version numbers cannot be set by the user.
Later versions of a file with the same file designation and
extension receive higher version numbers. A version number may
be explicitly supplied in referencing an existing file, otherwise
a default is provided.
All commands that accept as input a file name will also
accept a file path, which consists of a node path followed by a
file name, with the two parts separated by a right angle bracket
(unless the node path is only a context, in which case the right
angle bracket is omitted). If a node path is given, the file
name is used in the <FILES> node under the node referenced. If a
node path is not given, the file name is used in the <FILES> node
under the connect context -- the default context for a file
reference is the connect context.
For example:
MAIL.TXT
The file name references the file MAIL.TXT in the <FILES> node
under the connect context.
<*.SAV;*
The file name references all versions of all files with the
extension SAV in the <FILES> node under the connect context.
î
DFTP User's Guide 4
<<MACROS>COMMON>SYSMAC.MAC
Starting at the attached context (presumably a user node), the
file path references the file SYSMAC.MAC in the <FILES> node
under the COMMON subdirectory of the MACROS subdirectory.
Command Summaryî _______________
DFTP command and argument input is similar to TENEX, with
command recognition and TENEX editing controls. In particular,
<control-A> deletes a character,
<control-R> retypes the line,
<control-X> and <rubout> delete the line,
<escape> and <space> are separators, and
<carriage return>, <line feed> and <eol> are
terminators.
The DFTP commands and their arguments are:
ATTACH <node path>
CONNECT <node path>
DELETE <file path>
DIRECTORY <file path>
TERSE
VERBOSE
EXPUNGE <node path>
GET <file path> [local synonym]
RETRIEVE is exactly equivalent to GET.
LIST <node path>
NO-DATALANGUAGE
î
DFTP User's Guide 5
PUT <file path> [remote synonym]
STORE is exactly equivalent to PUT.
QUIT
REMOVE <node path>
SHOW-DATALANGUAGE
TIME-TRANSFERS
UNDELETE <file path>
UNTIME-TRANSFERS
Items in angle brackets are required arguments; items in square
brackets are optional ones.
The connect context is the default context for all
commands except ATTACH and CONNECT, which have as their
respective defaults the top context and the attach context.
Many commands have default arguments and trailers which
are invoked by giving a space or escape as the argument or
argument terminator. The default argument is '<<' for the
CONNECT command, '<' for EXPUNGE, and '**' for LIST and
REMOVE, which is also the default trailer. For DIRECTORY, GET,
PUT, DELETE, and UNDELETE, the default argument and trailer
(after a '>') is '*.*;*'.
Node Oriented Commandsî ______________________
The ATTACH command sets the attach context and initiates
Datacomputer accounting functions.
The CONNECT command sets the connect context (and creates
new subdirectories).
The EXPUNGE command removes files marked as deleted from the
<FILES> node under the node given as the command argument. If
the <FILES> node contains no files (deleted or undeleted) it is
deleted from the Datacomputer directory.
The LIST command lists Datacomputer nodes (sites, users,
subdirectories, and <FILES>) and information about them. The
information displayed by the VERBOSE option comes directly from
the Datacomputer.
î
DFTP User's Guide 6
The REMOVE command removes nodes from the Datacomputer
directory; they must either have no inferior nodes, or be part
of a node set specified using "**". In the latter case, data
stored under the nodes will also be deleted.
File Oriented Commandsî ______________________
File deletion operates as with TENEX. The DELETE command
marks files as deleted, but does not eliminate them. They can be
listed via the VERBOSE option of the DIRECTORY command, and their
deleted status can be changed by the UNDELETE command. The
removal of deleted files is deferred until an EXPUNGE is
performed on the <FILES> node containing them. The default
version number is the lowest undeleted, unless a file set is
indicated, in which case all versions in the set are deleted.
The DIRECTORY command lists files and information about
them. The VERBOSE option lists deleted and undeleted files (with
deleted ones indicated by a D after the name), the date and time
created (for TOPS-10 sites), the date and time last written (for
TENEX sites), the date and time stored, and the size. For files
stored from TENEX sites the size information is in the form
<number of bytes>(<byte size>). For files stored from TOPS-10
sites the information is in the form <number of 36 bit
words>(-<data mode)). The TERSE option lists undeleted files and
their sizes (as with the VERBOSE option). The default version
number is the highest undeleted, unless a file set is indicated,
in which case information for all versions in the set is listed.
The GET and PUT commands retrieve and store local disk files
on the Datacomputer. Files of any type (text or binary image, for
example) can be stored. If a synonym is not supplied, the
Datacomputer file name is used as the local file name. If the
first argument to either command is completed with an escape or a
space, the synonym option is invoked and the commands then
operate in the form
GET Datacomputer file [AS] local file, and
PUT local file [AS] Datacomputer file.
For the GET command the default version number is the highest
undeleted, unless a file set is indicated, in which case all
versions of the set are retrieved. The PUT command sets the
version number of the file being stored to be one greater than
the highest version of existing files with the same file
designation and extension (note that a file set indicated in any
file name field is treated as if all existing files had the same
field -- storing *.* results in the stored files receiving
version numbers one greater than the highest version number found
in any existing file).
î
DFTP User's Guide 7
The UNDELETE command rescinds a file's deleted status. The
default version number is the highest deleted, unless a file set
is indicated, in which case all versions in the set are
undeleted.
Miscellaneous Commandsî ______________________
ENABLE causes DFTP to recognize an expanded set of commands,
including the privileged commands discussed below. Its action
is marked by a change in the prompt character, from "*" to"!".
The SHOW-DATALANGUAGE and NO-DATALANGUAGE commands
respectively allow and inhibit the output to the user's terminal
of the messages sent to and received from the Datacomputer.
Data transfer rates are calculated and given to the user
when the TIME-TRANSFERS command has been invoked. The
calculations are avoided with the UNTIME-TRANSFERS command.
QUIT exits gracefully from DFTP, closing network
connections.
Site Dependent Featuresî _______________________
For the TOPS-10 version, the LOCAL-DIRECTORY command lists
the user's local file directory.
For the TENEX version, the EXEC command provides the user
with an inferior exec, which is flushed when the user returns to
DFTP. Where a local file name is possible (in the GET and PUT
commands) an initial space or escape invokes TENEX name
recognition, indicated by a right angle bracket prompt. A
control-O can be used to halt the output from the LIST and
DIRECTORY commands.
Responsesî _________
There are three types of messages that DFTP gives the user.
Comments surrounded by square brackets are primarily
informational messages, and are never errors. Parentheses
enclose non-fatal errors and informational Datacomputer messages,
such as '(LEBAR2: ERROR: NO SUCH FILE)', resulting from an
attempt to DELETE a nonexistent file, and '(SXPF9: STAGING DATA
FOR FILE = DFTP.CCA.DFTP.<FILES>)', indicating that data is being
moved from tertiary mass memory to secondary buffer memory.
These messages come directly from the Datacomputer, indicated by
the name and colon at the head of the message. Fatal error
messages are surrounded by question marks, and of course never
occur.
î
DFTP User's Guide 8
Access Controlî ______________
Access control in DFTP uses a subset of the full
Datacomputer facilities. The full discussion of Datacomputer
privilege facilities is in the current Datacomputer User manual;
however, the following summary should suffice for most DFTP
users. Access privileges are specified in "privilege blocks"
attached to nodes in the directory. A node may have any number
of privilege blocks attached to it; each specifies a particular
set of access privileges, and a class of users to whom that set
applies. DFTP provides two classes of access:
- CONTROL allows users to create and allocate nodes under
the node at which it is granted, change privileges at
that node and below, and read, write, and delete data
stored below that node.
- READ allows users to attach to a node and read data
stored under it, but not to perform any of the other
functions granted by CONTROL.
All other users are prevented from any access to the data. Users
may be may be identified in DFTP by their network identity
(defined by the host and socket from which they access the
Datacomputer), and by passwords. (Some systems enforce
assignment of socket numbers according to the user's identity on
that system, thus providing a convenient automatic identification
to DFTP.)
When a user attempts to ATTACH to a node, or to read or
write data stored under it, the Datacoputer checks to see if the
user is in any of the user-sets identified in privilege blocks on
that node, and if so, assigns the corresponding class of
privileges. If no set matches the user, then no privileges are
allowed. The scan is done in the order of creation of privilege
blocks, and if a user matches more than one, the first one takes
effect. Access controls are set by the CHANGE and CREATE
commands, described in the following section.
Privileged Commandsî ___________________
Certain administrative functions are performed by a set of
restricted commands, known as "privileged commands." These are
not normally available to the user; they are recognized by DFTP
only after execution of the ENABLE command.
î
DFTP User's Guide 9
- The ALLOCATE command is used to set the maximum number
of megabits a user may consume (it can also be used to
set subdirectory limits). Allocations are made and
reported in Megabits (actually 1,013,760 bits), which is
55 512-word pages, or 220 128-word blocks.
- The CHANGE command resets the access control information
for a given node. It first deletes all existing access
control specifications (privilege blocks); then it
builds new privilege blocks interactively with the user.
The PROTECTION subcommand of the LIST command can be
used to examine the privilege blocks of nodes.
- The CREATE command is used to create a node for a new
user; after the node has been created, it falls into
the same access control specificaion as the CHANGE
command.
- The DISABLE command returns the user from Privileged
Command mode to normal use; this is signalled by a
return to an asterisk as a prompt character.
- The LINK command allows the user to send Datalanguage to
the Datacomputer directly. In this mode, prompted by a
left angle bracket, each line typed by the user is sent
directly to the Datacomputer. It is terminated by
submission of an empty line, whereupon DFTP returns to
ENABLE mode, as signalled by an exclamation-point
prompt.
î
DFTP Command Summaryî ____________________
Paths
<node path> ::= <context>
| <node list>
| **
| <context> **
| <context> <node list>
| <context> <node list> > **î _
| <node list> > **î _
<context> ::= < (connect context)î _
| < (attach context)î _
| <<< (top context)î ___
<node list> ::= <node>
| <node> > <node list>î _
<node> ::= <name>
| <name> : <password>
| *
<file path> ::= <file name>
| <context> <file name>
| <node list> > <file name>î _
| <context> <node list> > <file name>î _
<file name> ::= <file>
| <file> .
| <file> . <extension>
| <file> ; <version>
| <file> . ; <version>
| <file> . <extension> ; <version>
<file> ::= <name> | *
<extension> ::= <name> | *
<version> ::= <number> | *
Notes:
Underscored angle brackets should be included literally.
Any printing ASCII characters except <, >, ., :, *, ?, ',
and " may be used in a <name>.
Any printing ASCII characters (plus space) except >, ., ',
and " may be used in a <password>.
î
Commands
ATTACH <node path>
CONNECT <node path> (1)
DELETE <file path> (4) (5)
DIRECTORY <file path> (4) (6)
TERSE
VERBOSE
ENABLE
EXPUNGE <node path> (2)
GET (RETRIEVE) <file path> [local file name synonym] (4) (6)
LIST <node path> (3)
TERSE
VERBOSE
NO-DATALANGUAGE
PUT (STORE) <file path> [remote file path synonym] (4)
QUIT
REMOVE <node path> (3)
SHOW-DATALANGUAGE
TIME-TRANSFERS
UNDELETE <file path> (4) (7)
UNTIME-TRANSFERS
Notes:
Required input is indicated by angle brackets.
Optional input is indicated by square brackets.
The connect context is the default context for all commands
except ATTACH and CONNECT, which have as their
respective defaults the top context and the attach
context.
(1) The default argument is <<.
(2) The default argument is <.
(3) The default argument (and trailer) is **.
(4) The default argument (and trailer) is *.*;*.
(5) The default version is the lowest undeleted.
(6) The default version is the highest undeleted.
(7) The default version is the highest deleted.
î
Privileged Commands and Their Subargumentsî __________________________________________
ALLOCATE <node path>
Megabits: [decimal integer]
CHANGE <node path>
Add a new privilege? [Y(es)] or [N(o)]
Allow write? [Y(es)] or [N(o)]
Restrict via network? [Y(es)] or [N(o)]
Restrict via local host? [Y(es)] or [N(o)]
Host number (octal): [octal integer]
(if host not local)
Restrict via user? [Y(es)] or [N(o)]
Socket number (octal): [octal integer]
(if user restricted and host not local)
User: [user name]
(if user restricted and host local)
(a directory name if TENEX)
(a programmer number if TOPS-10)
Restrict via password? [Y(es) or N(o)]
Password: [string]
CREATE <node path>
(see CHANGE)
LIST
PROTECTION
LINK
(A null input line returns the user to command mode.)
î
Examples Using Privileged Commandsî __________________________________
;Attach to a node.
; (gain control at site CCA by supplying the proper password)
*ATTACH <<<CCA:
*ENABLE
;Create a user and privileges.
; (the first privilege allows creation and deletion for
; local user HACKER upon supplying the password "ETAOIN")
; (the second privilege allows creation and deletion for
; anyone from Harvard (host 11) upon supplying the password "SHRDLU")
; (the third privilege allows anyone read)
!CREATE HACKER
[OK]
Add a new privilege? Yes
Allow control? Yes
Restrict via network? Yes
Restrict via local host? Yes
Restrict via user? Yes
User: HACKER
Restrict via password? Yes
Password: ETAOIN
[OK]
Add a new privilege? Yes
Allow control? Yes
Restrict via network? Yes
Restrict via local host? No
Site: 11
Restrict via user? No
Restrict via password? Yes
Password: SHRDLU
[OK]
Add a new privilege? Yes
Allow control? No
Restrict via network? No
Restrict via password? No
[OK]
Add a new privilege? No
;List the privileges.
; (in Datacomputer format (passwords are never listed))
!LIST HACKER
!!PROTECTION
CCA
HACKER
] (1),U=**,H=31,S=12582928,G=CLWRA
] (2),U=**,H=9,S=ANY,G=CLWRA
î
] (3),U=**,H=ANY,S=ANY,G=LR
î
;Replace the privileges.
; (the first privilege allows creation and deletion for
; local user HACKER)
; (the second privilege allows anyone read
; upon supplying the password "WALDO")
; (the "[OK]" indicates that the previous privileges have been deleted)
!CHANGE HACKER
[OK]
Add a new privilege? Yes
Allow control? Yes
Restrict via network? Yes
Restrict via local host? Yes
Restrict via user? Yes
User: HACKER
Restrict via password? No
[OK]
Add a new privilege? Yes
Allow control? No
Restrict via network? No
Restrict via password? Yes
Password: WALDO
[OK]
Add a new privilege? No
;List the privileges.
!LIST HACKER
!!PROTECTION
CCA
HACKER
] (1),U=**,H=31,S=12582928,G=CLWRA
] (2),U=**,H=ANY,S=ANY,G=LR
;List all information.
; ("MX-U" indicates the maximum allocation in megabits)
!LIST HACKER
!!VERBOSE
CCA
HACKER
] MX-U=10.00 CHRG=0.00
] IN-N=0 IN-F=0
] CREA=761101052805
;Change the allocation.
; (decrease the allocation from 10 megabits to 2 megabits)
!ALLOCATE HACKER
[Megabits:2]
î
;List all information.
!LIST HACKER
!!VERBOSE
CCA
HACKER
] MX-U=2.00 CHRG=0.00
] IN-N=0 IN-F=0
] CREA=761101052805
î
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