📄 rfc265.txt
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File Transfer Protocol RFC 265 17 November 1971
Code Implicit Data Type
Hex Octal Byte Size
00 000 1 Bit stream (standard default)
01 001 none Binary data bytes
02 002 8 Network ASCII characters
03 003 8 EBCDIC characters
04 004 36 DEC-packed ASCII (five 7-bit
characters, 36th bit 1 or 0)
05 005 8 Decimal numbers, net. ASCII
06 006 8 Octal numbers, net. ASCII
07 007 8 Hexadecimal numbers, net. ASCII
08 010
through through Reserved for standard assignemt
4f 077
5A 100
through through Assigned for experimental use
FF 377
3B.2 Requests and Identifiers
Retrieve, create, append, append_with_create, delete, rename_from,
and rename_to requests must contain a pathname specifying a file,
following the opcode in the information field. In the list request a
pathname may or may not follow the opcode. If present, the pathname
may specify either a file or a directory.
A file pathname must uniquely identify a file in the serving host.
The syntax of pathnames and identifying information shall conform to
serving host conventions, except that standard network ASCII (7-bit
ASCII right justified in 8-bit) field with most signifcant bit as
zero) shall be used.
The store request has a 4-byte (32 bits) 'allocate size' field
followed by a pathname specifying a file. 'Allocate size' indicates
the number of bits of storage to be allocated to the file. An
allocate size of zero indicates that server should use his default.
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File Transfer Protocol RFC 265 17 November 1971
Retrieve request achieves the transfer of a copy of file specified
in pathname, from serving to using host. the status and contents of
file in serving host should be unaffected.
Create request causes a file to be created at the serving host as
specified in pathname, A copy of the file is transferred from the
using to the serving host. If the file specified in pathname already
exists at the serving host, an error terminate should be sent by the
server.
Store request achieves the transfer of copy of file from using to
serving host. If file specified in pathname exists on serving hosts,
then its contents shall be replaced by the contents of the file
being transferred. A new file is created at the serving host if the
file specified in pathname does not exist.
Append request achieves the transfer of data from using to serving
host. The transferred data is appended to file specified in
pathname, at serving host. If the specified file does not exist at
serving host, an error terminate should be sent by the server.
Append with create request achieves the transfer of data from using
to serving host. If file specified is pathname exists at serving
host, then the transferred data is appended to that file, otherwise
the file specified in pathname is created at the serving host.
Rename from and rename to requests cause the name of the file
specified in pathname of rename_from to be changed to the name
specified in pathname of rename_to. A rename_from request must
always be followed by a rename_to request.
Delete request causes file specified in pathname to be deleted from
the serving host. If an extra level of protection is desired such as
the query "Do you really wish to delete this file?", it is to be a
local implementation option in the using system. Such queries should
not be transmitted over network connections.
List request causes a list to be sent from the serving to using
host. If there is no pathname of if pathname is a directory, the
server should send a file directory list. If the pathname specifies
a file then server should send current information on the file.
Username and password identifiers contain the respective identifying
information. Normally, the information will be supplied by the user
of the file transfer service. These identifiers will normally be
sent at the start of connetion for access control.
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File Transfer Protocol RFC 265 17 November 1971
3B.3 Error and Acknowledge Terminates
The error transactions may have an error code indicated by the
second information byte. Transmission of an ASCII error message in
subsequent bytes is permitted with all error codes, except that with
Hex '0A' error code, ASCII text is required. The errors here relate
to file transfer functions only. Data synchronization and related
errors in data transfer are to be handled at the DTP level. The
following error codes are currently defined:
Error Code (2nd descriptor byte) Meaning
Hex Octal
00 000 Error condition indicated by
computer system (external to protocol)
01 001 Name syntay error
02 002 Access control violation
03 003 Abort (by user)
04 004 Allocate size too big
05 005 Allocate size overflow
06 006 Improper order for transactions
07 007 Opcode not implemented
08 010 File search failed
09 011 Incorrect or missing identifier
0A 012 Error described in text message
(ASCII characters follow code)
0B 013 File already exists (in create request)
At present, no completion codes are defined for acknowledge,
It is assumed that acknowledge refers to the current request
being fulfilled.
4. Order of transactions
4A. A certain order of transactions must be maintained in
fulfilling file transfer requests. The exact sequence in
wich transactions occur depends on the type of request, as
described in action 4B. The fullfillment of a request may be
aborted anytime by either host, as explained in section 4C.
4B. Identifier transactions (set data type, username, and
password) may be sent by user at any time. The usual order
would be a username transaction followed by a password
transaction at the start of the connection. No acknowledge
is required, or permitted. The identifiers are to be used
for default handling, and access control.
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File Transfer Protocol RFC 265 17 November 1971
Retrieve and list requests cause cause the transfer of file from
server to user. After a complete file has been transferred, the
server should indicate end-of-file (by sending CLS or file
separator) to complete the request fulfillment sequence, as shown
below.
Retrieve / List requests
----------------------------->
User < File -- Data> Server
<-----------------------------
End of file indication
<-----------------------------
Store, create, append, and append_with_create requests cause
the transfer of file from user to server. After a complete
file has been transferred, the user should send an
end-of-file indication. The receipt of the file must be
acknowledged by the server, as shown below.
Create / Store / Append / Append_with_create requests
----------------------------->
User <File --- Data> Server
----------------------------->
End of file indication
----------------------------->
Acknowledge
<-----------------------------
Rename_from request must be followed by a rename_to request.
The request must be acknowledged as shown below.
User Rename_from request Server
----------------------------->
Rename_ro request
----------------------------->
Acknowledge
<-----------------------------
The delete request requires the server to acknowledge it, as
shown below.
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File Transfer Protocol RFC 265 17 November 1971
User Delete Server
----------------------------->
Acknowledge
<-----------------------------
Error transactions my be sent by either host at any time,
and these terminate the current request fulfillment sequence.
4C. Aborts. Eithe host may abort a request fulfillment sequence
at any time by sending an error terminate, or by closing the
connection (NCP to transmit a CCLS for the connection). CLS
is a more drastic type of abort and shall be used when there
is a catastrophic failure, or when abort is desired in the
middle of a long transaction. The abort indicates to the
receiving host that sender of abort wishes to terminate
request fulfillment and is now ready to initiate ar fulfill
new requests. When CLS is used to abort, the using host will
he responsible for reopening connection. The file transfer
abort described here is different form data transfer
abort which is sent only by the sender of data. The use of
the data transfer is not defined in this protocol.
5. Initial Connection, CLS, and Access Control
5A. Socket 3 is the standard preassigned socket number on which
the cooperating file transfer process at the serving host
should "listen". (*)The connection establishment will be in
accordance with the standard initial connection
protocol, (*)establishing a full-duplex connection.
5B. The connection will be broken by trading a CLS between the
NCP's for each of the two connections. Normally, the user
will initiate CLS.
CLS may also be used by either user or server, to abort a
transation in the middle. If CLS is received in the middle
of transaction, the current request fulfillment sequence will
be aborted. The using host will then reopen connection.
5C. It is recommended that identifier (user name and password)
transactions be sent by user to server, at the start, as this
would facilitate default handline and access control for the
entire duration of connection. Some service sites may
require the indentifier transactions. The identifier
transactions do not require or permit an acknowledge, and the
user can proceed directly with requests. If the identifier
information is incorrect or not received, the server may send
an error transaction indicating access control, violation,
[Page 11]
File Transfer Protocol RFC 265 17 November 1971
upon subsequent requests.
---------------------------------
(*)
Socket 1 has been assigned to logger, socket 3 seems a
reasonable choice for File Transfer.
(*)
RFC 165, or any subsequent standard applicable in initial
connection to loggers.
[ This RFC was put into machine readable form for entry ]
[ into the online RFC archives by Gottfried Janik 7/97 ]
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