draft-ietf-nntpext-base-11.txt   draft-ietf-nntpext-base-12.txt 
INTERNET DRAFT S. Barber INTERNET DRAFT S. Barber
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Network News Transport Protocol Network News Transport Protocol
draft-ietf-nntpext-base-11.txt draft-ietf-nntpext-base-12.txt
1. Status of this Document 1. Status of this Document
This document is an Internet-Draft and is in full conformance This document is an Internet-Draft and is in full conformance
with Section 10 of RFC 2026. Internet-Drafts are working with Section 10 of RFC 2026. Internet-Drafts are working
documents of the Internet Engineering Task Force (IETF), its documents of the Internet Engineering Task Force (IETF), its
areas, and its working groups. Note that other groups may areas, and its working groups. Note that other groups may
also distribute working documents as Internet-Drafts. also distribute working documents as Internet-Drafts.
Internet-Drafts are draft documents valid for a maximum of six Internet-Drafts are draft documents valid for a maximum of six
months and may be updated, replaced, or made obsolete by other months and may be updated, replaced, or made obsolete by other
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This document specifies the Network News Transport Protocol This document specifies the Network News Transport Protocol
(NNTP), which is used for the distribution, inquiry, (NNTP), which is used for the distribution, inquiry,
retrieval, and posting of net news articles using a reliable retrieval, and posting of net news articles using a reliable
stream-based mechanism. For news reading clients, NNTP enables stream-based mechanism. For news reading clients, NNTP enables
retrieval of news articles that are stored in a central retrieval of news articles that are stored in a central
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database, giving subscribers the ability to select only those database, giving subscribers the ability to select only those
articles they wish to read. articles they wish to read.
The netnews model provides for indexing, cross-referencing, The netnews model provides for indexing, cross-referencing,
and expiration of aged messages. For server-to-server and expiration of aged messages. For server-to-server
interaction, NNTP is designed for efficient transmission of interaction, NNTP is designed for efficient transmission of
net news articles over a reliable full duplex communication net news articles over a reliable full duplex communication
method. method.
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or more of the MUST requirements for this protocol. An or more of the MUST requirements for this protocol. An
implementation that satisfies all the MUST and all the SHOULD implementation that satisfies all the MUST and all the SHOULD
requirements for its protocols is said to be "unconditionally requirements for its protocols is said to be "unconditionally
compliant"; one that satisfies all the MUST requirements but compliant"; one that satisfies all the MUST requirements but
not all the SHOULD requirements for NNTP is said to be not all the SHOULD requirements for NNTP is said to be
"conditionally compliant". "conditionally compliant".
For the remainder of this memo, the term "client host" refers For the remainder of this memo, the term "client host" refers
to a host making use of the NNTP service, while the term to a host making use of the NNTP service, while the term
"server host" refers to a host that offers the NNTP service. "server host" refers to a host that offers the NNTP service.
In addition, where examples of interactions between a client In addition, where examples of interactions between a client
host and a server host are provided a "[C]" will be used to host and a server host are provided a "[C]" will be used to
represent the client host and a "[S]" will be used to represent the client host and a "[S]" will be used to
represent the server host. represent the server host.
4. Basic Operation 4. Basic Operation.
Every NNTP session MUST involve the following in this order: Every NNTP session MUST involve the following in this order:
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CONNECTION CONNECTION
GREETING GREETING
DISCONNECTION DISCONNECTION
Other steps may occur between the GREETING and DISCONNECTION Other steps may occur between the GREETING and DISCONNECTION
step. They are: step. They are:
CAPABILITIES DISCOVERY CAPABILITIES DISCOVERY
NEWS EXCHANGE NEWS EXCHANGE
CONCLUSION CONCLUSION
NNTP operates over any reliable data stream 8-bit-wide NNTP operates over any reliable data stream 8-bit-wide
channel. When running over TCP/IP, the official port for the channel. When running over TCP/IP, the official port for the
NNTP service is 119. Initially, the server host starts the NNTP service is 119. Initially, the server host starts the
NNTP service by listening on a TCP port. When a client host NNTP service by listening on a TCP port. When a client host
wishes to make use of the service, it MUST establish a TCP wishes to make use of the service, it MUST establish a TCP
connection with the server host by connecting to that host on connection with the server host by connecting to that host on
the same port on which the server is listening. This is the the same port on which the server is listening. This is the
CONNECTION step. When the connection is established, the NNTP CONNECTION step. When the connection is established, the NNTP
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NNTP operates over any reliable data stream 8-bit-wide NNTP operates over any reliable data stream 8-bit-wide
channel. When running over TCP/IP, the official port for the channel. When running over TCP/IP, the official port for the
NNTP service is 119. Initially, the server host starts the NNTP service is 119. Initially, the server host starts the
NNTP service by listening on a TCP port. When a client host NNTP service by listening on a TCP port. When a client host
wishes to make use of the service, it MUST establish a TCP wishes to make use of the service, it MUST establish a TCP
connection with the server host by connecting to that host on connection with the server host by connecting to that host on
the same port on which the server is listening. This is the the same port on which the server is listening. This is the
CONNECTION step. When the connection is established, the NNTP CONNECTION step. When the connection is established, the NNTP
server host MUST send a greeting. This is the GREETING step. server host MUST send a greeting. This is the GREETING step.
The client host and server host SHOULD then exchange commands The client host and server host SHOULD then exchange commands
and responses (respectively) until the connection is closed or and responses (respectively) until the connection is closed or
aborted. This final step is called the DISCONNECTION step. aborted. This final step is called the DISCONNECTION step.
If there is a CONCLUSION step, it MUST immediately precede the If there is a CONCLUSION step, it MUST immediately precede the
DISCONNECTION step. There MUST be only one CONNECTION, DISCONNECTION step. There MUST be only one CONNECTION,
CONCLUSION and DISCONNECTION step for each NNTP session. All CONCLUSION and DISCONNECTION step for each NNTP session. All
other steps MAY be repeated as needed. For example, the other steps MAY be repeated as needed. For example, the
GREETING step may be repeated if the client makes use of the GREETING step may be repeated if the client makes use of the
MODE READER command (See Section 7.1.2 for more on the MODE MODE READER command (See Section 7.2 for more on the MODE
READER command). READER command).
The character set for all NNTP commands is UTF-8. Commands in The character set for all NNTP commands is UTF-8. Commands in
the NNTP MUST consist of an US-ASCII case-insensitive keyword, the NNTP MUST consist of an US-ASCII case-insensitive keyword,
which MAY be followed by one or more arguments. An US-ASCII which MAY be followed by one or more arguments. An US-ASCII
CRLF pair MUST terminate all commands. Multiple commands MUST CRLF pair MUST terminate all commands. Multiple commands MUST
NOT be on the same line. Keywords MUST consist of printable NOT be on the same line. Keywords MUST consist of printable
US-ASCII characters. Unless otherwise noted elsewhere in this US-ASCII characters. Unless otherwise noted elsewhere in this
document, arguments SHOULD consist of printable US-ASCII document, arguments SHOULD consist of printable US-ASCII
characters. Keywords and arguments MUST be each separated by characters. Keywords and arguments MUST be each separated by
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CRLF pair. Arguments MUST NOT exceed 497 octets. CRLF pair. Arguments MUST NOT exceed 497 octets.
Each response MUST start with a three-digit response code that Each response MUST start with a three-digit response code that
is sufficient to distinguish all responses. Certain valid is sufficient to distinguish all responses. Certain valid
responses are defined to be multi-line; for all others, the responses are defined to be multi-line; for all others, the
response is contained in a single line. All multi-line response is contained in a single line. All multi-line
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responses MUST adhere to the following format: After sending responses MUST adhere to the following format: After sending
the first line of the response and an US-ASCII CRLF, any the first line of the response and an US-ASCII CRLF, any
additional lines are sent, each terminated by an US-ASCII CRLF additional lines are sent, each terminated by an US-ASCII CRLF
pair. When all lines of the response have been sent, a final pair. When all lines of the response have been sent, a final
line MUST be sent, consisting of a termination octet (US-ASCII line MUST be sent, consisting of a termination octet (US-ASCII
decimal code 046, ".") and an US-ASCII CRLF pair. If any line decimal code 046, ".") and an US-ASCII CRLF pair. If any line
of the multi-line response begins with the termination octet, of the multi-line response begins with the termination octet,
the line MUST be "byte-stuffed" by pre-pending the termination the line MUST be "byte-stuffed" by pre-pending the termination
octet to that line of the response. Hence, a multi-line octet to that line of the response. Hence, a multi-line
response is terminated with the five octets "CRLF.CRLF" (in response is terminated with the five octets "CRLF.CRLF" (in
US-ASCII). When examining a multi-line response, the client US-ASCII). When examining a multi-line response, the client
MUST check to see if the line begins with the termination MUST check to see if the line begins with the termination
octet. If so and if octets other than US-ASCII CRLF follow, octet. If so and if octets other than US-ASCII CRLF follow,
the first octet of the line (the termination octet) MUST be the first octet of the line (the termination octet) MUST be
stripped away. If so and if US-ASCII CRLF immediately follows stripped away. If so and if US-ASCII CRLF immediately follows
the termination character, then the response from the NNTP the termination character, then the response from the NNTP
server is ended and the line containing ".CRLF" (in US-ASCII) server is ended and the line containing ".CRLF" (in US-ASCII)
MUST NOT considered part of the multi-line response. Where a MUST NOT be considered part of the multi-line response. Where
response is multi-line, the description of the command will a response is multi-line, the description of the command will
define the format of the response before "byte-stuffing" takes define the format of the response before "byte-stuffing" takes
place. place.
A NNTP server MAY have an inactivity autologout timer. Such a A NNTP server MAY have an inactivity autologout timer. Such a
timer MUST be of at least three minutes duration. The receipt timer MUST be of at least three minutes duration. The receipt
of any command from the client during that interval SHOULD of any command from the client during that interval SHOULD
suffice to reset the autologout timer. When the timer suffice to reset the autologout timer. When the timer
expires, the server should close the TCP connection without expires, the server should close the TCP connection without
sending any response to the client. sending any response to the client.
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program error occurred. program error occurred.
The next digit in the code indicates the function response The next digit in the code indicates the function response
category. category.
x0x - Connection, setup, and miscellaneous messages x0x - Connection, setup, and miscellaneous messages
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x1x - Newsgroup selection x1x - Newsgroup selection
x2x - Article selection x2x - Article selection
x3x - Distribution functions x3x - Distribution functions
x4x - Posting x4x - Posting
x8x - Reserved for authentication and authorization extensions x8x - Reserved for authentication and authorization extensions
x9x - Reserved for private use (non-standard extensions) x9x - Reserved for private use (non-standard extensions)
Certain responses contain parameters such as numbers and names Certain responses contain parameters such as numbers and names
in addition to the status indicator. In those cases, the in addition to the status indicator. In those cases, the
number and type of such parameters is fixed for each response number and type of such parameters is fixed for each response
code to simplify interpretation by the client (any extension code to simplify interpretation by the client (any extension
MUST follow this principle as well). In all other cases, the MUST follow this principle as well). In all other cases, the
client MUST only use the status indicator itself to determine client MUST only use the status indicator itself to determine
the nature of the response. The exact response codes that can the nature of the response. The exact response codes that can
be returned in response to a given command are detailed in the be returned in response to a given command are detailed in the
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existing commands, and other ways of changing the internal existing commands, and other ways of changing the internal
state of the server. However, the server MUST NOT produce any state of the server. However, the server MUST NOT produce any
other responses to a client that does not invoke any of the other responses to a client that does not invoke any of the
additional features. (Therefore a client that restricts itself additional features. (Therefore a client that restricts itself
to this specification will only receive the responses that are to this specification will only receive the responses that are
listed). listed).
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If a client receives an unexpected response, it SHOULD use the If a client receives an unexpected response, it SHOULD use the
first digit of the response to determine the result. For first digit of the response to determine the result. For
example, an unexpected 2xx should be taken as success and an example, an unexpected 2xx should be taken as success and an
unexpected 4xx or 5xx as failure. unexpected 4xx or 5xx as failure.
Response codes not specified in this standard MAY be used for Response codes not specified in this standard MAY be used for
any installation-specific additional commands also not any installation-specific additional commands also not
specified. These SHOULD be chosen to fit the pattern of x9x specified. These SHOULD be chosen to fit the pattern of x9x
specified above. specified above.
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inside the open square bracket. The final operation uses the inside the open square bracket. The final operation uses the
backslash character to invalidate the special meaning of the backslash character to invalidate the special meaning of the
open square bracket ([), the asterisk, backslash, or the open square bracket ([), the asterisk, backslash, or the
question mark. Two backslashes in sequence will result in the question mark. Two backslashes in sequence will result in the
evaluation of the backslash as a character with no special evaluation of the backslash as a character with no special
meaning. meaning.
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Implementers must be careful to apply the pattern-matching Implementers must be careful to apply the pattern-matching
operators to whole characters encoded in UTF-8, and not two operators to whole characters encoded in UTF-8, and not to
individual octets. individual octets.
5.1 Negating the wildmat pattern 5.1 Negating the wildmat pattern
The exclamation point can be used at the beginning of a wildmat The exclamation point can be used at the beginning of a
to negate it. That is, if the remainder of the pattern would wildmat to negate it. That is, if the remainder of the pattern
match the string then the negated pattern does not, and vice would match the string then the negated pattern does not, and
versa. If it appears as any other character other than the first vice versa. If it appears as any other character other than
one, it has no special meaning. the first one, it has no special meaning.
5.2 Examples 5.2 Examples
a) [^]-] -- matches any single character other than a a) [^]-] -- matches any single character other than a
close square bracket or a minus sign/dash. close square bracket or a minus sign/dash.
b) *bdc -- matches any string that ends with the string b) *bdc -- matches any string that ends with the string
"bdc" including the string "bdc" (without quotes). "bdc" including the string "bdc" (without quotes).
c) [0-9a-zA-Z] -- matches any single printable c) [0-9a-zA-Z] -- matches any single printable
alphanumeric ASCII character. alphanumeric ASCII character.
d) a??d -- matches any four character string which d) a??d -- matches any four character string which
begins with a and ends with d. begins with a and ends with d.
e) !bc*d -- matches any string that does not start with e) !bc*d -- matches any string that does not start with
"bc" and end with "d" (without quotes) "bc" and end with "d" (without quotes)
f) !\\x -- matches any string that does not start with f) !\\x -- matches any string that does not start with
"\x" (without quotes) "\x" (without quotes)
6. Format for Keyword Descriptions 6. Format for Keyword Descriptions
On the following pages are descriptions of each keyword On the following pages are descriptions of each keyword
recognized by the NNTP server and the responses that will be recognized by the NNTP server and the responses that will be
returned by those commands. These keywords are grouped by the returned by those commands. These keywords are grouped by the
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On the following pages are descriptions of each keyword On the following pages are descriptions of each keyword
recognized by the NNTP server and the responses that will be recognized by the NNTP server and the responses that will be
returned by those commands. These keywords are grouped by the returned by those commands. These keywords are grouped by the
functional step in which they are used. functional step in which they are used.
Each keyword is shown in upper case for clarity, although the Each keyword is shown in upper case for clarity, although the
NNTP server ignores case in the interpretation of commands. NNTP server ignores case in the interpretation of commands.
Parameters are shown as follows: Parameters are shown as follows:
o UPPERCASE indicates literal text to be included in the o UPPERCASE indicates literal text to be included in the
command; command;
o lowercase indicates a token described elsewhere; o lowercase indicates a token described elsewhere;
o [brackets] indicate that the parameter is optional; o [brackets] indicate that the parameter is optional;
o ellipsis... indicates that the parameter may be repeated o ellipsis... indicates that the parameter may be repeated
any number of times (it must occur at least once); any number of times (it must occur at least once);
o vertical|bar indicates a choice of two mutually exclusive o vertical|bar indicates a choice of two mutually exclusive
parameters (exactly one must be provided). parameters (exactly one must be provided).
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Parameters are case or language specific only when specified Parameters are case or language specific only when specified
(either in this document or in RFC 1036[6]). (either in this document or in RFC 1036[6]).
The name "wildmat" for a parameter indicates that it is a The name "wildmat" for a parameter indicates that it is a
wildmat format pattern as defined in section 5. wildmat format pattern as defined in section 5.
7. The GREETING Step 7. The GREETING Step
7.1 Initial Connection 7.1 Initial Connection
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Otherwise the server MUST present a 400 or 502 greeting code Otherwise the server MUST present a 400 or 502 greeting code
and then immediately close the connection. 502 MUST be used if and then immediately close the connection. 502 MUST be used if
the client is not permitted under any circumstances to the client is not permitted under any circumstances to
interact with the server and 400 otherwise. interact with the server and 400 otherwise.
7.1.1 Initial Connection Example 7.1.1 Initial Connection Example
Example of a normal connection from an authorized client Example of a normal connection from an authorized client
[C] Initial TCP connection completed [C] Initial TCP connection completed
[S] 200 NNTP Service Ready, posting permitted [S] 200 NNTP Service Ready, posting permitted
Client can send commands at this point. In this example, the Client can send commands at this point. In this example, the
client jumps directly to the conclusion step (See section 10). client jumps directly to the conclusion step (See section 10).
[C] QUIT [C] QUIT
[S] 205 NNTP Service exits normally [S] 205 NNTP Service exits normally
Example of a normal connection from an unauthorized client Example of a normal connection from an unauthorized client
[C] Initial TCP connection completed [C] Initial TCP connection completed
[S] 502 NNTP Service Unavailable [S] 502 NNTP Service Unavailable
At this point, the server closes the TCP connection. At this point, the server closes the TCP connection.
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Example of a normal connection from an authorized client that Example of a normal connection from an authorized client that
is not permitted to post is not permitted to post
[C] Initial TCP connection completed [C] Initial TCP connection completed
[S] 201 NNTP Service Ready, posting prohibited [S] 201 NNTP Service Ready, posting prohibited
Client can send commands at this point. In this example, the Client can send commands at this point. In this example, the
client jumps directly to the conclusion step (See section 10). client jumps directly to the conclusion step (See section 10).
[C] QUIT [C] QUIT
[S] 205 NNTP Service exits normally [S] 205 NNTP Service exits normally
Example of a connection from any client where the server is Example of a connection from any client where the server is
unable to provide service unable to provide service
[C] Initial TCP connection completed [C] Initial TCP connection completed
[S] 400 NNTP Service temporarily unavailable [S] 400 NNTP Service temporarily unavailable
At this point, the server closes the TCP connection. At this point, the server closes the TCP connection.
7.1.2 MODE READER 7.2 MODE READER
MODE READER MODE READER
MODE READER SHOULD be used by the client to indicate to the MODE READER SHOULD be used by the client to indicate to the
server that it is a newsreading client. This command may be server that it is a newsreading client. This command may be
entered at any time. The server MUST present a response (as entered at any time. The server MUST present a response (as
described in section 7.1) appropriate to the server's ability described in section 7.1) appropriate to the server's ability
to provide service to this client in this mode. to provide service to this client in this mode.
7.1.2.1 Responses 7.2.1 Responses
200 Posting Permitted 200 Posting Permitted
201 Posting Not Permitted 201 Posting Not Permitted
400 Service temporarily unavailable 400 Service temporarily unavailable
502 Service unavailable 502 Service unavailable
Following a 400 or 502 response the server MUST immediately Following a 400 or 502 response the server MUST immediately
close the connection. close the connection.
Note that the response need not be the same as the one Note that the response need not be the same as the one
presented during the initial greeting. presented during the initial greeting.
7.1.2.2 MODE READER Examples 7.2.2 MODE READER Examples
Example of use of the MODE READER command by an authorized Example of use of the MODE READER command by an authorized
client client
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[C] MODE READER [C] MODE READER
[S] 200 NNTP Service Ready, posting permitted [S] 200 NNTP Service Ready, posting permitted
Client can send commands at this point. In this example, the Client can send commands at this point. In this example, the
client jumps directly to the conclusion step (See section 10). client jumps directly to the conclusion step (See section 10).
[C] QUIT [C] QUIT
[S] 205 NNTP Service exits normally [S] 205 NNTP Service exits normally
Example of use of MODE READER by a client not authorized to Example of use of MODE READER by a client not authorized to
receive service from the server as a news reader receive service from the server as a news reader
[C] MODE READER [C] MODE READER
[S] 502 Service Unavailable [S] 502 Service Unavailable
At this point, the server closes the TCP connection. At this point, the server closes the TCP connection.
Example of a normal connection from an authorized client that Example of a normal connection from an authorized client that
is not permitted to post is not permitted to post
[C] MODE READER [C] MODE READER
[S] 201 NNTP Service Ready, posting prohibited [S] 201 NNTP Service Ready, posting prohibited
Client can send commands at this point. In this example, the Client can send commands at this point. In this example, the
client jumps directly to the conclusion step (See section 10). client jumps directly to the conclusion step (See section 10).
[C] QUIT [C] QUIT
[S] 205 NNTP Service exits normally [S] 205 NNTP Service exits normally
Example of a connection from any client where the server is Example of a connection from any client where the server is
unable to provide news reader service unable to provide news reader service
[C] MODE READER [C] MODE READER
[S] 400 NNTP Service temporarily unavailable [S] 400 NNTP Service temporarily unavailable
At this point, the server closes the TCP connection. At this point, the server closes the TCP connection.
8. The CAPABILITIES DISCOVERY Step 8. The CAPABILITIES DISCOVERY Step
An NNTP client that wishes to use extensions to NNTP can query A client NNTP that wishes to use extensions to NNTP can query
the server to determine which extensions are available. This the server to determine which extensions are available. This
is done with the LIST EXTENSIONS command. is done with the LIST EXTENSIONS command.
If a particular extension is unavailable, the client can If a particular extension is unavailable, the client can
attempt to work around it or it may wish to terminate the attempt to work around it or it may wish to terminate the
session. session.
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See section 12 for further discussion of extensions. See section 12 for further discussion of extensions.
8.1 LIST EXTENSIONS 8.1 LIST EXTENSIONS
The LIST EXTENSIONS command allows a client to determine which The LIST EXTENSIONS command allows a client to determine which
extensions are supported by the server. extensions are supported by the server.
A client NNTP supporting NNTP service extensions SHOULD query A client NNTP supporting NNTP service extensions SHOULD query
a server early in the session for extensions session by the server early in the session for extensions session by
issuing the LIST EXTENSIONS command. An NNTP Server that issuing the LIST EXTENSIONS command. An NNTP Server that
conforms to the specification in this document MUST give a conforms to the specification in this document MUST give a
successful response (see section 8.1.1), a failure response successful response (see section 8.1.1), a failure response
(see section 8.1.2), or an error response (see section 8.1.3). (see section 8.1.2), or an error response (see section 8.1.3).
This command MAY be issued at anytime during a session. It is This command MAY be issued at anytime during a session. It is
not required that the client issues this command before not required that the client issues this command before
attempting to make use of any extension. The response attempting to make use of any extension. The response
generated by this command MAY change during a session because generated by this command MAY change during a session because
of other state information. However, a client NNTP MUST NOT of other state information. However, a client NNTP MUST NOT
cache (for use in another session) any information returned if cache (for use in another session) any information returned if
the LIST EXTENSIONS command succeeds. That is, a client NNTP the LIST EXTENSIONS command succeeds. That is, a client NNTP
is only able to get the current and correct information is only able to get the current and correct information
concerning available extensions during a session by issuing a concerning available extensions during a session by issuing a
LIST EXTENSIONS command during that session and processing LIST EXTENSIONS command during that session and processing
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by itself. by itself.
A typical example reply to the LIST EXTENSIONS command might A typical example reply to the LIST EXTENSIONS command might
be a multiline reply of the form: be a multiline reply of the form:
[C] LIST EXTENSIONS [C] LIST EXTENSIONS
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[S] 202 Extensions supported: [S] 202 Extensions supported:
[S] OVER [S] OVER
[S] PAT [S] PAT
[S] LISTGROUP [S] LISTGROUP
[S] . [S] .
8.1.2 Failure response 8.1.2 Failure response
If for some reason the server NNTP is unable to list the If for some reason the NNTP server is unable to list the
service extensions it supports, it MUST return code 503. No service extensions it supports, it MUST return code 503. No
list (not even an empty one) will be returned. list (not even an empty one) will be returned.
In the case of a failure response, the client NNTP may try the In the case of a failure response, the client NNTP may try the
extensions either as the need arises or configure itself for extensions either as the need arises or configure itself for
the basic NNTP functionality defined in this document. the basic NNTP functionality defined in this document.
8.1.3 Error responses from extended servers 8.1.3 Error responses from extended servers
If the server NNTP recognizes the LIST EXTENSIONS command, but If the NNTP server recognizes the LIST EXTENSIONS command, but
due to various conditions cannot make any extensions available due to various conditions cannot make any extensions available
to the client at the time the client issued the LIST to the client at the time the client issued the LIST
EXTENSIONS command, it MUST return code 402. No list (not even EXTENSIONS command, it MUST return code 402. No list (not even
an empty one) will be returned. an empty one) will be returned.
The client NNTP should configure itself for the basic NNTP The client NNTP should configure itself for the basic NNTP
functionality defined in this document, or issue commands that functionality defined in this document, or issue commands that
might change the state of the server, or issue the QUIT might change the state of the server, or issue the QUIT
command (see section 10.1) if a particular extension is command (see section 10.1) if a particular extension is
required for the client to properly operate. required for the client to properly operate.
If the server NNTP determines that the NNTP service is no If the NNTP server determines that the NNTP service is no
longer available (e.g., due to imminent system shutdown), it longer available (e.g., due to imminent system shutdown), it
must return code 400. Note that this response code should not must return code 400. Note that this response code should not
be generated due to an inactivity timeout as described in be generated due to an inactivity timeout as described in
section 4. section 4.
In the case of any error response outlined in this section, In the case of any error response outlined in this section,
the client NNTP should issue the QUIT command (see section the client NNTP should issue the QUIT command (see section
10.1). This will facilitate an orderly shutdown of the 10.1). This will facilitate an orderly shutdown of the
session. session.
8.1.4 Responses from improperly implemented servers 8.1.4 Responses from improperly implemented servers
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A server NNTP that improperly implements the LIST EXTENSIONS An NNTP server that improperly implements the LIST EXTENSIONS
command may return an empty list. Clients SHOULD accommodate command may return an empty list. Clients SHOULD accommodate
this protocol violation and interpret it as a response code this protocol violation and interpret it as a response code
402. 402.
The client NNTP should configure itself for the basic NNTP The client NNTP should configure itself for the basic NNTP
functionality defined in this document, or issue commands that functionality defined in this document, or issue commands that
might change the state of the server, or issue the QUIT might change the state of the server, or issue the QUIT
command (see section 10.1) if a particular extension is command (see section 10.1) if a particular extension is
required for the client to properly operate. required for the client to properly operate.
skipping to change at line 700 skipping to change at line 743
MUST have higher numbers than those that arrive earlier. The MUST have higher numbers than those that arrive earlier. The
server SHOULD allocate the next sequential unused number to server SHOULD allocate the next sequential unused number to
each new article. each new article.
Article numbers MUST lie between 1 and 4,294,967,295 Article numbers MUST lie between 1 and 4,294,967,295
inclusive. The client and server SHOULD NOT use leading zeroes inclusive. The client and server SHOULD NOT use leading zeroes
in specifying article numbers, and MUST NOT use more than 16 in specifying article numbers, and MUST NOT use more than 16
digits. In some situations, the value zero replaces an article digits. In some situations, the value zero replaces an article
number to show some special situation. number to show some special situation.
9.1.1 Article Retrieval by News Group Name and Article Number 9.1.1 Article Retrieval by Newsgroup Name and Article Number
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The following commands are used to set the current news group The following commands are used to set the current news group
name and the "current article pointer" which is used by other name and the "current article pointer" which is used by other
commands for article retrieval. At the start of a NNTP commands for article retrieval. At the start of a NNTP
session, both of these values are undefined. session, both of these values are undefined.
9.1.1.1 GROUP 9.1.1.1 GROUP
GROUP ggg GROUP ggg
The required parameter ggg is the name of the news group to be The required parameter ggg is the name of the news group to be
selected (e.g. "news.software.b"). A list of valid news groups selected (e.g. "news.software.b"). A list of valid news groups
may be obtained by using the LIST keyword. See section 9.4 may be obtained by using the LIST keyword. See section 9.4
for more information on the LIST keyword. for more information on the LIST keyword.
The successful selection response will return the article The successful selection response will return the article
numbers of the first and last articles in the group at the numbers of the first and last articles in the group at the
moment of selection (these numbers are referred to as the moment of selection (these numbers are referred to as the
"reported low water mark" and the "reported high water mark"), "reported low water mark" and the "reported high water mark"),
and an estimate of the number of articles on file in the and an estimate of the number of articles on file in the
skipping to change at line 759 skipping to change at line 805
a non-empty group. a non-empty group.
The set of articles in a group may change after the GROUP The set of articles in a group may change after the GROUP
command is carried out. That is: command is carried out. That is:
o articles may be removed from the group o articles may be removed from the group
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o articles may be reinstated in the group with the same o articles may be reinstated in the group with the same
article number, but those articles MUST have numbers no article number, but those articles MUST have numbers no
less than the reported low water mark (note that this is less than the reported low water mark (note that this is
a reinstatement of the previous article, not a new a reinstatement of the previous article, not a new
article reusing the number) article reusing the number)
o new articles may be added with article numbers greater o new articles may be added with article numbers greater
than the reported high water mark (if an article that was than the reported high water mark (if an article that was
the one with the highest number has been removed, the the one with the highest number has been removed, the
next new article will not have the number one greater next new article will not have the number one greater
than the reported high water mark) than the reported high water mark)
Except when the group is empty and all three numbers are zero, Except when the group is empty and all three numbers are zero,
whenever a subsequent GROUP command for the same news group is whenever a subsequent GROUP command for the same news group is
issued, either by the same client or a different client, the issued, either by the same client or a different client, the
reported low water mark in the response MUST be no less than reported low water mark in the response MUST be no less than
skipping to change at line 811 skipping to change at line 858
9.1.1.1.1 Responses 9.1.1.1.1 Responses
211 n f l s group selected 211 n f l s group selected
(n = estimated number of articles in group, f = first (n = estimated number of articles in group, f = first
article number in the group, l = last article number article number in the group, l = last article number
in the group, s = name of the group.) in the group, s = name of the group.)
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411 no such news group 411 no such news group
9.1.1.1.2 GROUP Examples 9.1.1.1.2 GROUP Examples
Example for a group known to the server Example for a group known to the server
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
Example for a group unknown to the server Example for a group unknown to the server
[C] GROUP example.is.sob.bradner.or.barber [C] GROUP example.is.sob.bradner.or.barber
[S] 411 example.is.sob.bradner.or.barber is unknown [S] 411 example.is.sob.bradner.or.barber is unknown
9.1.1.2 LAST 9.1.1.2 LAST
LAST LAST
If the current news group is valid, the internally maintained If the current news group is valid, the internally maintained
"current article pointer" MUST be set to the previous article "current article pointer" MUST be set to the previous article
in the current news group. If already positioned at the first in the current news group. If already positioned at the first
article of the news group, an error message MUST be returned article of the news group, an error message MUST be returned
and the current article MUST remain selected. and the current article MUST remain selected.
There MAY be no previous article in the group, although the There MAY be no previous article in the group, although the
current article number is not the reported low water mark. current article number is not the reported low water mark.
There MUST NOT be a previous article when the current article There MUST NOT be a previous article when the current article
number is the reported low water mark. number is the reported low water mark.
skipping to change at line 854 skipping to change at line 904
life of a particular NNTP session. life of a particular NNTP session.
If successful, a response indicating the current article If successful, a response indicating the current article
number and a message-id string MUST be returned. No article number and a message-id string MUST be returned. No article
text is sent in response to this command. text is sent in response to this command.
9.1.1.2.1 Responses 9.1.1.2.1 Responses
223 n a article retrieved - request text separately (n = 223 n a article retrieved - request text separately (n =
article number, a = unique article id) article number, a = unique article id)
412 no news group selected 412 no news group selected
420 no current article has been selected 420 no current article has been selected
422 no previous article in this group
9.1.1.2.2 LAST Examples 422 no previous article in this group
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9.1.1.2.2 LAST Examples
Example of a successful article retrieval using LAST Example of a successful article retrieval using LAST
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] NEXT [C] NEXT
[S] 223 3000237 <668929@domain.com> retrieved [S] 223 3000237 <668929@domain.com> retrieved
[C] LAST [C] LAST
[S] 223 3000234 <45223423@to.to> retrieved [S] 223 3000234 <45223423@to.to> retrieved
Example of an attempt to retrieve an article without having Example of an attempt to retrieve an article without having
selected a group (via the GROUP command) first selected a group (via the GROUP command) first
[S] 200 NNTP Service ready [S] 200 NNTP Service ready
[C] LAST [C] LAST
[S] 412 no newsgroup selected [S] 412 no newsgroup selected
Example of an attempt to retrieve an article using the LAST Example of an attempt to retrieve an article using the LAST
command when the current article pointer is pointing at the command when the current article pointer is pointing at the
first article in the group first article in the group
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] LAST [C] LAST
[S] 422 No previous article to retrieve [S] 422 No previous article to retrieve
Example of an attempt to retrieve an article using the LAST Example of an attempt to retrieve an article using the LAST
command when the current group selected is empty command when the current group selected is empty
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP example.empty.newsgroup [C] GROUP example.empty.newsgroup
[S] 211 0 0 0 example.empty.newsgroup [S] 211 0 0 0 example.empty.newsgroup
[C] LAST [C] LAST
[S] 420 No current article selected [S] 420 No current article selected
9.1.1.3 NEXT 9.1.1.3 NEXT
NEXT NEXT
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If the current news group is valid, the internally maintained If the current news group is valid, the internally maintained
"current article pointer" MUST be advanced to the next article "current article pointer" MUST be advanced to the next article
in the current news group. If no more articles remain in the in the current news group. If no more articles remain in the
current group, an error message MUST be returned and the current group, an error message MUST be returned and the
current article MUST remain selected. current article MUST remain selected.
If successful, a response indicating the current article If successful, a response indicating the current article
number and the message-id string MUST be returned. No article number and the message-id string MUST be returned. No article
text is sent in response to this command. text is sent in response to this command.
skipping to change at line 925 skipping to change at line 996
current article MUST remain selected. current article MUST remain selected.
If successful, a response indicating the current article If successful, a response indicating the current article
number and the message-id string MUST be returned. No article number and the message-id string MUST be returned. No article
text is sent in response to this command. text is sent in response to this command.
9.1.1.3.1 Responses 9.1.1.3.1 Responses
223 n a article retrieved - request text separately (n = 223 n a article retrieved - request text separately (n =
article number, a = unique article id) article number, a = unique article id)
412 no news group selected 412 no news group selected
420 no current article has been selected 420 no current article has been selected
421 no next article in this group 421 no next article in this group
9.1.1.3.2 NEXT Examples 9.1.1.3.2 NEXT Examples
Example of a successful article retrieval using NEXT Example of a successful article retrieval using NEXT
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] NEXT [C] NEXT
[S] 223 3000237 <668929@domain.com> retrieved [S] 223 3000237 <668929@domain.com> retrieved
Example of an attempt to retrieve an article without having Example of an attempt to retrieve an article without having
selected a group (via the GROUP command) first selected a group (via the GROUP command) first
[S] 200 NNTP Service ready [S] 200 NNTP Service ready
[C] NEXT [C] NEXT
[S] 412 no newsgroup selected [S] 412 no newsgroup selected
Example of an attempt to retrieve an article using the NEXT Example of an attempt to retrieve an article using the NEXT
command when the current article pointer is pointing at the command when the current article pointer is pointing at the
last article in the group last article in the group
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
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[C] ARTICLE 3002322 [C] ARTICLE 3002322
[S] 220 3002322 <411@whitehouse.gov> retrieved [S] 220 3002322 <411@whitehouse.gov> retrieved
[S] Path: pathost!demo!whitehouse!not-for-mail [S] Path: pathost!demo!whitehouse!not-for-mail
[S] From: nobody@whitehouse.gov(Demo User) [S] From: nobody@whitehouse.gov(Demo User)
[S] Newsgroups: misc.test [S] Newsgroups: misc.test
[S] Subject: I am just a test article [S] Subject: I am just a test article
[S] Date: 6 Oct 1998 04:38:40 -0500 [S] Date: 6 Oct 1998 04:38:40 -0500
[S] Organization: The White House, Washington, DC [S] Organization: The White House, Washington, DC
[S] Message-ID: <411@whitehouse.gov> [S] Message-ID: <411@whitehouse.gov>
[S] [S]
[S] This is just a test article. [S] This is just a test article.
[S] . [S] .
[C] NEXT [C] NEXT
[S] 422 No next article to retrieve [S] 422 No next article to retrieve
Example of an attempt to retrieve an article using the NEXT Example of an attempt to retrieve an article using the NEXT
command when the current group selected is empty command when the current group selected is empty
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP example.empty.newsgroup [C] GROUP example.empty.newsgroup
[S] 211 0 0 0 example.empty.newsgroup [S] 211 0 0 0 example.empty.newsgroup
[C] NEXT [C] NEXT
[S] 420 No current article selected [S] 420 No current article selected
9.2 Retrieval of Articles and Article Sections 9.2 Retrieval of Articles and Article Sections
The ARTICLE, BODY, HEAD, and STAT commands are very similar. The ARTICLE, BODY, HEAD, and STAT commands are very similar.
They differ only in the parts of the article that are They differ only in the parts of the article that are
presented to the client and in the successful response code. presented to the client and in the successful response code.
The ARTICLE command is described here in full, while the other The ARTICLE command is described here in full, while the other
commands are described in terms of the differences. commands are described in terms of the differences.
An article, as defined by RFC 1036, consists of two parts: the An article, as defined by RFC 1036, consists of two parts: the
article headers and the article body. When responding to one article headers and the article body. When responding to one
of these commands, the server presents the entire article or of these commands, the server presents the entire article or
appropriate part and does not attempt to alter or translate it appropriate part and does not attempt to alter or translate it
in any way. in any way.
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9.2.1 ARTICLE 9.2.1 ARTICLE
ARTICLE <message-id> ARTICLE <message-id>
ARTICLE [number] ARTICLE [number]
The ARTICLE command selects an article based on the arguments The ARTICLE command selects an article based on the arguments
and presents the header, a blank line, and the body of that and presents the header, a blank line, and the body of that
article. The command has two forms. article. The command has two forms.
In the first form, a message-id is specified (including the In the first form, a message-id is specified (including the
angle brackets), and the server presents the article with that angle brackets), and the server presents the article with that
message-id in its headers. In this case, the server MUST NOT message-id in its headers. In this case, the server MUST NOT
alter the "current article pointer". This is both to alter the "current article pointer". This is both to
skipping to change at line 1021 skipping to change at line 1119
and presents the header, a blank line, and the body of that and presents the header, a blank line, and the body of that
article. The command has two forms. article. The command has two forms.
In the first form, a message-id is specified (including the In the first form, a message-id is specified (including the
angle brackets), and the server presents the article with that angle brackets), and the server presents the article with that
message-id in its headers. In this case, the server MUST NOT message-id in its headers. In this case, the server MUST NOT
alter the "current article pointer". This is both to alter the "current article pointer". This is both to
facilitate the presentation of articles that may be referenced facilitate the presentation of articles that may be referenced
within another article being read, and because of the semantic within another article being read, and because of the semantic
difficulties of determining the proper sequence and membership difficulties of determining the proper sequence and membership
of an article which may have been posted to more than one news of an article which may have been posted to more than one
group. newsgroup.
In the second form, an article number may be specified. If so, In the second form, an article number may be specified. If so,
and if there is an article with that number in the currently and if there is an article with that number in the currently
selected group, the server MUST set the current article selected group, the server MUST set the current article
pointer to that number. pointer to that number.
Then, whether or not a number was specified, the article Then, whether or not a number was specified, the article
indicated by the current article pointer is presented to the indicated by the current article pointer is presented to the
client. client.
skipping to change at line 1051 skipping to change at line 1149
selected article except when an article number argument was selected article except when an article number argument was
provided and the article exists; in particular, it MUST NOT provided and the article exists; in particular, it MUST NOT
change it following an unsuccessful response. change it following an unsuccessful response.
9.2.1.1 Responses 9.2.1.1 Responses
First form (message-id specified): First form (message-id specified):
220 0 a article retrieved and follows (multiline, a = 220 0 a article retrieved and follows (multiline, a =
unique article id) unique article id)
430 no such article 430 no such article
502 service unavailable
Second form (optional article number specified): 502 service unavailable
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Second form (optional article number specified):
220 n a article retrieved and follows (multiline, n = 220 n a article retrieved and follows (multiline, n =
article number, a = unique article id) article number, a = unique article id)
412 no news group selected 412 no news group selected
420 no current article selected 420 no current article selected
423 no such article number in this group 423 no such article number in this group
502 service unavailable 502 service unavailable
The 420 response only occurs if an article number has been The 420 response only occurs if no article number has been
specified. specified.
In the 220 response, the first parameter is 0 for the first In the 220 response, the first parameter is 0 for the first
form and the article number (within the current group) for the form and the article number (within the current group) for the
second form. The second parameter is the message-id of the second form. The second parameter is the message-id of the
article (within angle brackets). This is taken from the article (within angle brackets). This is taken from the
message-id header line of the article (required by RFC 1036). message-id header line of the article (required by RFC 1036).
If there is no such line, the message-id "<0>" MUST be used If there is no such line, the message-id "<0>" MUST be used
instead (without the double quotes). instead (without the double quotes).
Since the message-id field is unique for each article, it may Since the message-id field is unique for each article, it may
be used by a client to skip duplicate displays of articles be used by a client to skip duplicate displays of articles
that have been posted more than once, or to more than one news that have been posted more than once, or to more than one
group. newsgroup.
The article headers and body are returned as a multiline The article headers and body are returned as a multiline
response following the initial response line. response following the initial response line.
9.2.1.2 Examples 9.2.1.2 Examples
Example of a successful retrieval of an article (using no Example of a successful retrieval of an article (using no
article number) article number)
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
skipping to change at line 1095 skipping to change at line 1198
The article headers and body are returned as a multiline The article headers and body are returned as a multiline
response following the initial response line. response following the initial response line.
9.2.1.2 Examples 9.2.1.2 Examples
Example of a successful retrieval of an article (using no Example of a successful retrieval of an article (using no
article number) article number)
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] ARTICLE [C] ARTICLE
[S] 220 3000234 <45223423@to.to> [S] 220 3000234 <45223423@to.to>
[S] Path: pathost!demo!somewhere!not-for-mail [S] Path: pathost!demo!somewhere!not-for-mail
[S] From: nobody@nowhere.to (Demo User) [S] From: nobody@nowhere.to (Demo User)
[S] Newsgroups: misc.test [S] Newsgroups: misc.test
[S] Subject: I am just a test article [S] Subject: I am just a test article
[S] Date: 6 Oct 1998 04:38:40 -0500 [S] Date: 6 Oct 1998 04:38:40 -0500
[S] Organization: Nowhere, To [S] Organization: Nowhere, To
[S] Message-ID: <45223423@to.to> [S] Message-ID: <45223423@to.to>
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[S] [S]
[S] This is just a test article. [S] This is just a test article.
[S] . [S] .
Example of a successful retrieval of an article by message-id Example of a successful retrieval of an article by message-id
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] ARTICLE <45223423@to.to> [C] ARTICLE <45223423@to.to>
[S] 220 0 <45223423@to.to> [S] 220 0 <45223423@to.to>
[S] Path: pathost!demo!somewhere!not-for-mail [S] Path: pathost!demo!somewhere!not-for-mail
[S] From: nobody@nowhere.to (Demo User) [S] From: nobody@nowhere.to (Demo User)
[S] Newsgroups: misc.test [S] Newsgroups: misc.test
[S] Subject: I am just a test article [S] Subject: I am just a test article
[S] Date: 6 Oct 1998 04:38:40 -0500 [S] Date: 6 Oct 1998 04:38:40 -0500
[S] Organization: Nowhere, To [S] Organization: Nowhere, To
[S] Message-ID: <45223423@to.to> [S] Message-ID: <45223423@to.to>
[S] [S]
[S] This is just a test article. [S] This is just a test article.
[S] . [S] .
Example of an unsuccessful retrieval of an article by message- Example of an unsuccessful retrieval of an article by message-
id id
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] ARTICLE <i.am.not.there@nowhere.to> [C] ARTICLE <i.am.not.there@nowhere.to>
[S] 430 No Such Article Found [S] 430 No Such Article Found
Example of an unsuccessful retrieval of an article by number Example of an unsuccessful retrieval of an article by number
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 news.groups [S] 211 1234 3000234 3002322 news.groups
[C] ARTICLE 300256 [C] ARTICLE 300256
[S] 423 No such article number in this group [S] 423 No such article number in this group
Example of an unsuccessful retrieval of an article by number Example of an unsuccessful retrieval of an article by number
because no news group was selected first because no news group was selected first
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] ARTICLE 300256 [C] ARTICLE 300256
[S] 412 No news group selected [S] 412 No news group selected
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Example of an attempt to retrieve an article when the current Example of an attempt to retrieve an article when the current
group selected is empty group selected is empty
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP example.empty.newsgroup [C] GROUP example.empty.newsgroup
[S] 211 0 0 0 example.empty.newsgroup [S] 211 0 0 0 example.empty.newsgroup
[C] ARTICLE [C] ARTICLE
[S] 420 No current article selected [S] 420 No current article selected
Example of a failure due to the service being unavailable Example of a failure due to the service being unavailable
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] ARTICLE <i.am.a.test.article@nowhere.to> [C] ARTICLE <i.am.a.test.article@nowhere.to>
[S] 502 Service unavailable [S] 502 Service unavailable
9.2.2 HEAD 9.2.2 HEAD
HEAD <message-id> HEAD <message-id>
HEAD [number] HEAD [number]
The HEAD command behaves identically to the ARTICLE command The HEAD command behaves identically to the ARTICLE command
except that, if the article exists, only the headers are except that, if the article exists, only the headers are
presented (the blank line separating the headers and body MUST presented (the blank line separating the headers and body MUST
NOT be included). NOT be included).
9.2.2.1 Responses 9.2.2.1 Responses
First form (message-id specified): First form (message-id specified):
skipping to change at line 1190 skipping to change at line 1336
The HEAD command behaves identically to the ARTICLE command The HEAD command behaves identically to the ARTICLE command
except that, if the article exists, only the headers are except that, if the article exists, only the headers are
presented (the blank line separating the headers and body MUST presented (the blank line separating the headers and body MUST
NOT be included). NOT be included).
9.2.2.1 Responses 9.2.2.1 Responses
First form (message-id specified): First form (message-id specified):
221 0 a article retrieved, headers follow (multiline) 221 0 a article retrieved, headers follow (multiline)
430 no such article 430 no such article
502 service unavailable 502 service unavailable
Second form (optional article number specified): Second form (optional article number specified):
221 n a article retrieved, headers follow (multiline) 221 n a article retrieved, headers follow (multiline)
412 no news group selected 412 no news group selected
420 no current article selected 420 no current article selected
423 no such article number in this group 423 no such article number in this group
502 service unavailable 502 service unavailable
Except that only the headers are included in the response, the Except that only the headers are included in the response, the
221 response behaves identically to the 220 response of the 221 response behaves identically to the 220 response of the
ARTICLE command. ARTICLE command.
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9.2.2.2 Examples 9.2.2.2 Examples
Example of a successful retrieval of the headers in an article Example of a successful retrieval of the headers in an article
(using no article number) (using no article number)
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] HEAD [C] HEAD
[S] 220 3000234 <45223423@to.to> [S] 220 3000234 <45223423@to.to>
[S] Path: pathost!demo!somewhere!not-for-mail [S] Path: pathost!demo!somewhere!not-for-mail
[S] From: nobody@nowhere.to (Demo User) [S] From: nobody@nowhere.to (Demo User)
[S] Newsgroups: misc.test [S] Newsgroups: misc.test
[S] Subject: I am just a test article [S] Subject: I am just a test article
[S] Date: 6 Oct 1998 04:38:40 -0500 [S] Date: 6 Oct 1998 04:38:40 -0500
[S] Organization: Nowhere, To [S] Organization: Nowhere, To
[S] Message-ID: <45223423@to.to> [S] Message-ID: <45223423@to.to>
[S] . [S] .
Example of a successful retrieval of the headers in an article Example of a successful retrieval of the headers in an article
by message-id by message-id
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] HEAD <45223423@to.to> [C] HEAD <45223423@to.to>
[S] 220 0 <45223423@to.to> [S] 220 0 <45223423@to.to>
[S] Path: pathost!demo!somewhere!not-for-mail [S] Path: pathost!demo!somewhere!not-for-mail
[S] From: nobody@nowhere.to (Demo User) [S] From: nobody@nowhere.to (Demo User)
[S] Newsgroups: misc.test [S] Newsgroups: misc.test
[S] Subject: I am just a test article [S] Subject: I am just a test article
[S] Date: 6 Oct 1998 04:38:40 -0500 [S] Date: 6 Oct 1998 04:38:40 -0500
[S] Organization: Nowhere, To [S] Organization: Nowhere, To
[S] Message-ID: <45223423@to.to> [S] Message-ID: <45223423@to.to>
[S] . [S] .
Example of an unsuccessful retrieval of the header of an Example of an unsuccessful retrieval of the header of an
article by message-id article by message-id
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] HEAD <i.am.not.there@nowhere.to> [C] HEAD <i.am.not.there@nowhere.to>
[S] 430 No Such Article Found [S] 430 No Such Article Found
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Example of an unsuccessful retrieval of the header of an Example of an unsuccessful retrieval of the header of an
article by number article by number
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] HEAD 300256 [C] HEAD 300256
[S] 423 No such article number in this group [S] 423 No such article number in this group
Example of an unsuccessful retrieval the header of an article Example of an unsuccessful retrieval the header of an article
by number because no news group was selected first by number because no news group was selected first
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] HEAD 300256 [C] HEAD 300256
[S] 412 No news group selected [S] 412 No news group selected
Example of an attempt to retrieve the header of an article Example of an attempt to retrieve the header of an article
when the current group selected is empty when the current group selected is empty
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP example.empty.newsgroup [C] GROUP example.empty.newsgroup
[S] 211 0 0 0 example.empty.newsgroup [S] 211 0 0 0 example.empty.newsgroup
[C] HEAD [C] HEAD
[S] 420 No current article selected [S] 420 No current article selected
Example of a failure due to the service being unavailable Example of a failure due to the service being unavailable
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] HEAD <i.am.a.test.article@nowhere.to> [C] HEAD <i.am.a.test.article@nowhere.to>
[S] 502 Service unavailable [S] 502 Service unavailable
9.2.3 BODY 9.2.3 BODY
BODY <message-id> BODY <message-id>
BODY [number] BODY [number]
The BODY command behaves identically to the ARTICLE command The BODY command behaves identically to the ARTICLE command
except that, if the article exists, only the body is presented except that, if the article exists, only the body is presented
(the blank line separating the headers and body MUST NOT be (the blank line separating the headers and body MUST NOT be
included). included).
9.2.3.1 Responses 9.2.3.1 Responses
First form (message-id specified): First form (message-id specified):
skipping to change at line 1308 skipping to change at line 1497
9.2.3.1 Responses 9.2.3.1 Responses
First form (message-id specified): First form (message-id specified):
222 0 a article retrieved, body follows (multiline) 222 0 a article retrieved, body follows (multiline)
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430 no such article 430 no such article
502 service unavailable 502 service unavailable
Second form (optional article number specified): Second form (optional article number specified):
222 n a article retrieved, body follows (multiline) 222 n a article retrieved, body follows (multiline)
412 no news group selected 412 no news group selected
420 no current article selected 420 no current article selected
423 no such article number in this group 423 no such article number in this group
502 service unavailable 502 service unavailable
Except that only the body is included in the response, the 222 Except that only the body is included in the response, the 222
response behaves identically to the 220 response of the response behaves identically to the 220 response of the
ARTICLE command. ARTICLE command.
9.2.3.2 Examples 9.2.3.2 Examples
Example of a successful retrieval of the body of an article Example of a successful retrieval of the body of an article
(using no article number) (using no article number)
skipping to change at line 1332 skipping to change at line 1526
Except that only the body is included in the response, the 222 Except that only the body is included in the response, the 222
response behaves identically to the 220 response of the response behaves identically to the 220 response of the
ARTICLE command. ARTICLE command.
9.2.3.2 Examples 9.2.3.2 Examples
Example of a successful retrieval of the body of an article Example of a successful retrieval of the body of an article
(using no article number) (using no article number)
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] BODY [C] BODY
[S] 222 3000234 <45223423@to.to> [S] 222 3000234 <45223423@to.to>
[S] This is just a test article. [S] This is just a test article.
[S] . [S] .
Example of a successful retrieval of the body of an article by Example of a successful retrieval of the body of an article by
message-id message-id
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] BODY <45223423@to.to> [C] BODY <45223423@to.to>
[S] 222 0 <45223423@to.to> [S] 222 0 <45223423@to.to>
[S] This is just a test article. [S] This is just a test article.
[S] . [S] .
Example of an unsuccessful retrieval of the body of an article Example of an unsuccessful retrieval of the body of an article
by message-id by message-id
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] BODY <i.am.not.there@nowhere.to> [C] BODY <i.am.not.there@nowhere.to>
[S] 430 No Such Article Found [S] 430 No Such Article Found
Example of an unsuccessful retrieval of the body of an article Example of an unsuccessful retrieval of the body of an article
by number by number
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[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] BODY 300256 [C] BODY 300256
[S] 423 No such article number in this group [S] 423 No such article number in this group
Example of an unsuccessful retrieval of the body of an article Example of an unsuccessful retrieval of the body of an article
by number because no news group was selected first by number because no news group was selected first
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] BODY 300256 [C] BODY 300256
[S] 412 No news group selected [S] 412 No news group selected
Example of an attempt to retrieve the body of an article when Example of an attempt to retrieve the body of an article when
the current group selected is empty the current group selected is empty
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP example.empty.newsgroup [C] GROUP example.empty.newsgroup
[S] 211 0 0 0 example.empty.newsgroup [S] 211 0 0 0 example.empty.newsgroup
[C] BODY [C] BODY
[S] 420 No current article selected [S] 420 No current article selected
Example of a failure due to the service being unavailable Example of a failure due to the service being unavailable
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] BODY <i.am.a.test.article@nowhere.to> [C] BODY <i.am.a.test.article@nowhere.to>
[S] 502 Service unavailable [S] 502 Service unavailable
9.2.4 STAT 9.2.4 STAT
STAT <message-id> STAT <message-id>
STAT [number] STAT [number]
The STAT command behaves identically to the ARTICLE command The STAT command behaves identically to the ARTICLE command
except that, if the article exists, it is NOT presented to the except that, if the article exists, it is NOT presented to the
client. client.
This command allows the client to determine whether an article This command allows the client to determine whether an article
exists, and in the second form what its message-id is, without exists, and in the second form what its message-id is, without
having to process an arbitrary amount of text. having to process an arbitrary amount of text.
skipping to change at line 1410 skipping to change at line 1631
This command allows the client to determine whether an article This command allows the client to determine whether an article
exists, and in the second form what its message-id is, without exists, and in the second form what its message-id is, without
having to process an arbitrary amount of text. having to process an arbitrary amount of text.
9.2.4.1 Responses 9.2.4.1 Responses
First form (message-id specified): First form (message-id specified):
223 0 a article exists 223 0 a article exists
430 no such article 430 no such article
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502 service unavailable 502 service unavailable
Second form (optional article number specified): Second form (optional article number specified):
223 n a article exists 223 n a article exists
412 no news group selected 412 no news group selected
420 no current article selected 420 no current article selected
423 no such article number in this group 423 no such article number in this group
502 service unavailable 502 service unavailable
The parameters of the 223 response are identical to those that The parameters of the 223 response are identical to those that
would have been given in a 220 response to the equivalent would have been given in a 220 response to the equivalent
ARTICLE command. However, the response is NOT multiline. ARTICLE command. However, the response is NOT multiline.
9.2.4.2 Examples 9.2.4.2 Examples
Example of STAT on an existing article (using no article Example of STAT on an existing article (using no article
number) number)
skipping to change at line 1438 skipping to change at line 1664
The parameters of the 223 response are identical to those that The parameters of the 223 response are identical to those that
would have been given in a 220 response to the equivalent would have been given in a 220 response to the equivalent
ARTICLE command. However, the response is NOT multiline. ARTICLE command. However, the response is NOT multiline.
9.2.4.2 Examples 9.2.4.2 Examples
Example of STAT on an existing article (using no article Example of STAT on an existing article (using no article
number) number)
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] STAT [C] STAT
[S] 223 3000234 <45223423@to.to> [S] 223 3000234 <45223423@to.to>
Example of a STAT of an existing article by message-id Example of a STAT of an existing article by message-id
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] STAT <45223423@to.to> [C] STAT <45223423@to.to>
[S] 223 0 <45223423@to.to> [S] 223 0 <45223423@to.to>
Example of an STAT of an article not on the server by message- Example of an STAT of an article not on the server by message-
id id
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] STAT <i.am.not.there@nowhere.to> [C] STAT <i.am.not.there@nowhere.to>
[S] 430 No Such Article Found [S] 430 No Such Article Found
Example of STAT of an article not in the server by number Example of STAT of an article not in the server by number
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
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[C] STAT 300256 [C] STAT 300256
[S] 423 No such article number in this group [S] 423 No such article number in this group
Example of STAT of an article by number when no news group was Example of STAT of an article by number when no news group was
selected first selected first
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] STAT 300256 [C] STAT 300256
[S] 412 No news group selected [S] 412 No news group selected
Example of STAT of an article when the current group selected Example of STAT of an article when the current group selected
is empty is empty
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP example.empty.newsgroup [C] GROUP example.empty.newsgroup
[S] 211 0 0 0 example.empty.newsgroup [S] 211 0 0 0 example.empty.newsgroup
[C] STAT [C] STAT
[S] 420 No current article selected [S] 420 No current article selected
Example of a failure due to the service being unavailable Example of a failure due to the service being unavailable
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] STAT <i.am.a.test.article@nowhere.to> [C] STAT <i.am.a.test.article@nowhere.to>
[S] 502 Service unavailable [S] 502 Service unavailable
9.3 Article Posting 9.3 Article Posting
Article posting is done in one of two modes: individual Article posting is done in one of two modes: individual
article posting from news reading clients and article transfer article posting from news reading clients and article transfer
from other news servers. from other news servers.
9.3.1 POST 9.3.1 POST
skipping to change at line 1519 skipping to change at line 1764
If posting is permitted, the article MUST be presented to the If posting is permitted, the article MUST be presented to the
server by the client in the format specified by RFC 1036. The server by the client in the format specified by RFC 1036. The
text forming the header and body of the message to be posted text forming the header and body of the message to be posted
MUST be sent by the client using the conventions for text MUST be sent by the client using the conventions for text
received from the news server: A single period (".") on a line received from the news server: A single period (".") on a line
indicates the end of the text, with lines starting with a indicates the end of the text, with lines starting with a
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period in the original text having that period doubled during period in the original text having that period doubled during
transmission. transmission.
Following the presentation of the termination sequence by the Following the presentation of the termination sequence by the
client, the server MUST return a response code indicating client, the server MUST return a response code indicating
success or failure of the article transfer. Note that response success or failure of the article transfer. Note that response
codes 340 and 440 are used in direct response to the POST codes 340 and 440 are used in direct response to the POST
command. Others are returned following the sending of the command. Others are returned following the sending of the
article. article.
skipping to change at line 1541 skipping to change at line 1786
No attempt shall be made by the server to filter characters, No attempt shall be made by the server to filter characters,
fold or limit lines, or otherwise process incoming text. The fold or limit lines, or otherwise process incoming text. The
intent is that the server just passes the incoming message to intent is that the server just passes the incoming message to
be posted to the server installation's news posting software, be posted to the server installation's news posting software,
which is not part of this specification. which is not part of this specification.
9.3.1.1 Responses 9.3.1.1 Responses
240 article received ok 240 article received ok
340 send article to be posted. End with <CR-LF>.<CR-LF> 340 send article to be posted. End with <CR-LF>.<CR-LF>
440 posting not allowed 440 posting not allowed
441 posting failed 441 posting failed
9.3.1.2 Examples 9.3.1.2 Examples
Example of a successful posting Example of a successful posting
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] POST [C] POST
[S] 340 Input article. End with <CR-LF>.<CR-LF> [S] 340 Input article. End with <CR-LF>.<CR-LF>
[C] From: demo@testdomain.com(Demo User) [C] From: demo@testdomain.com(Demo User)
[C] Newsgroups: misc.test [C] Newsgroups: misc.test
[C] Subject: I am just a test article [C] Subject: I am just a test article
[C] Organization: Testdomain, USA [C] Organization: Testdomain, USA
[C] [C]
[C] This is just a test article. [C] This is just a test article.
[C] . [C] .
[S] 240 Article received ok [S] 240 Article received ok
Example of an unsuccessful posting Example of an unsuccessful posting
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] POST [C] POST
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[S] 340 Input article. End with <CR-LF>.<CR-LF> [S] 340 Input article. End with <CR-LF>.<CR-LF>
[C] From: demo@testdomain.com(Demo User) [C] From: demo@testdomain.com(Demo User)
[C] Newsgroups: misc.test [C] Newsgroups: misc.test
[C] Subject: I am just a test article [C] Subject: I am just a test article
[C] Organization: Testdomain, USA [C] Organization: Testdomain, USA
[C] [C]
[C] This is just a test article. [C] This is just a test article.
[C] . [C] .
[S] 441 Posting failed [S] 441 Posting failed
Example of an attempt to posting when posting is not allowed Example of an attempt to posting when posting is not allowed
[S] 201 NNTP Service Ready, read-only [S] 201 NNTP Service Ready, read-only
[C] POST [C] POST
[S] 440 Posting not permitted [S] 440 Posting not permitted
9.3.2 IHAVE 9.3.2 IHAVE
IHAVE <message-id> IHAVE <message-id>
The IHAVE command informs the server that the client has an The IHAVE command informs the server that the client has an
article whose id is <message-id>. If the server desires a copy article whose id is <message-id>. If the server desires a copy
of that article, it MUST return a response instructing the of that article, it MUST return a response instructing the
client to send the entire article. If the server does not want client to send the entire article. If the server does not want
skipping to change at line 1619 skipping to change at line 1889
will invoke the server's news posting program with the will invoke the server's news posting program with the
appropriate settings (flags, options, etc.) to indicate that appropriate settings (flags, options, etc.) to indicate that
the forthcoming article is being forwarded from another host. the forthcoming article is being forwarded from another host.
However, the server MAY elect not to post or forward the However, the server MAY elect not to post or forward the
article if after further examination of the article it deems article if after further examination of the article it deems
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it inappropriate to do so. Reasons for such subsequent it inappropriate to do so. Reasons for such subsequent
rejection of an article may include such problems as rejection of an article may include such problems as
inappropriate news groups or distributions, disk space inappropriate news groups or distributions, disk space
limitations, article lengths, garbled headers, and the like. limitations, article lengths, garbled headers, and the like.
These are typically restrictions enforced by the server host's These are typically restrictions enforced by the server host's
news software and not necessarily the NNTP server itself. news software and not necessarily the NNTP server itself.
9.3.2.1 Responses 9.3.2.1 Responses
skipping to change at line 1650 skipping to change at line 1924
inappropriate for posting or forwarding, an NNTP server MAY inappropriate for posting or forwarding, an NNTP server MAY
acknowledge the successful transfer of the article and later acknowledge the successful transfer of the article and later
silently discard it. Thus, an NNTP server MAY return the 235 silently discard it. Thus, an NNTP server MAY return the 235
acknowledgment code and later discard the received article. acknowledgment code and later discard the received article.
9.3.2.2 Examples 9.3.2.2 Examples
Example of successfully sending an article to another site Example of successfully sending an article to another site
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] IHAVE <i.am.an.article.you.will.want@nowhere.to> [C] IHAVE <i.am.an.article.you.will.want@nowhere.to>
[S] 335 Send it. End with <CR-LF>.<CR-LF> [S] 335 Send it. End with <CR-LF>.<CR-LF>
[C] Path: pathost!demo!somewhere!not-for-mail [C] Path: pathost!demo!somewhere!not-for-mail
[C] From: nobody@nowhere.to (Demo User) [C] From: nobody@nowhere.to (Demo User)
[C] Newsgroups: misc.test [C] Newsgroups: misc.test
[C] Subject: I am just a test article [C] Subject: I am just a test article
[C] Date: 6 Oct 1998 04:38:40 -0500 [C] Date: 6 Oct 1998 04:38:40 -0500
[C] Organization: Nowhere, To [C] Organization: Nowhere, To
[C] Message-ID: <i.am.a.test.article@nowhere.to> [C] Message-ID: <i.am.a.test.article@nowhere.to>
[C] [C]
[C] This is just a test article. [C] This is just a test article.
[C] . [C] .
[S] 235 Article transferred ok [S] 235 Article transferred ok
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Example of sending an article to another site that rejects it Example of sending an article to another site that rejects it
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] IHAVE <i.am.an.article.you.will.want@nowhere.to> [C] IHAVE <i.am.an.article.you.will.want@nowhere.to>
[S] 335 Send it. End with <CR-LF>.<CR-LF> [S] 335 Send it. End with <CR-LF>.<CR-LF>
[C] Path: pathost!demo!somewhere!not-for-mail [C] Path: pathost!demo!somewhere!not-for-mail
[C] From: nobody@nowhere.to (Demo User) [C] From: nobody@nowhere.to (Demo User)
[C] Newsgroups: misc.test [C] Newsgroups: misc.test
[C] Subject: I am just a test article [C] Subject: I am just a test article
[C] Date: 6 Oct 1998 04:38:40 -0500 [C] Date: 6 Oct 1998 04:38:40 -0500
[C] Organization: Nowhere, To [C] Organization: Nowhere, To
[C] Message-ID: <i.am.a.test.article@nowhere.to> [C] Message-ID: <i.am.a.test.article@nowhere.to>
[C] [C]
[C] This is just a test article. [C] This is just a test article.
[C] . [C] .
[S] 437 Article rejected. Don't send again [S] 437 Article rejected. Don't send again
Example of sending an article to another site where the Example of sending an article to another site where the
transfer fails transfer fails
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] IHAVE <i.am.an.article.you.will.want@nowhere.to> [C] IHAVE <i.am.an.article.you.will.want@nowhere.to>
[S] 335 Send it. End with <CR-LF>.<CR-LF> [S] 335 Send it. End with <CR-LF>.<CR-LF>
[C] Path: pathost!demo!somewhere!not-for-mail [C] Path: pathost!demo!somewhere!not-for-mail
[C] From: nobody@nowhere.to (Demo User) [C] From: nobody@nowhere.to (Demo User)
[C] Newsgroups: misc.test [C] Newsgroups: misc.test
[C] Subject: I am just a test article [C] Subject: I am just a test article
[C] Date: 6 Oct 1998 04:38:40 -0500 [C] Date: 6 Oct 1998 04:38:40 -0500
[C] Organization: Nowhere, To [C] Organization: Nowhere, To
[C] Message-ID: <i.am.a.test.article@nowhere.to> [C] Message-ID: <i.am.a.test.article@nowhere.to>
[C] [C]
[C] This is just a test article. [C] This is just a test article.
[C] . [C] .
[S] 436 Transfer failed [S] 436 Transfer failed
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Example of sending an article to another site that rejects it Example of sending an article to another site that rejects it
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] IHAVE <i.am.an.article.you.will.want@nowhere.to> [C] IHAVE <i.am.an.article.you.will.want@nowhere.to>
[S] 335 Send it. End with <CR-LF>.<CR-LF> [S] 335 Send it. End with <CR-LF>.<CR-LF>
[C] Path: pathost!demo!somewhere!not-for-mail [C] Path: pathost!demo!somewhere!not-for-mail
[C] From: nobody@nowhere.to (Demo User) [C] From: nobody@nowhere.to (Demo User)
[C] Newsgroups: misc.test [C] Newsgroups: misc.test
[C] Subject: I am just a test article [C] Subject: I am just a test article
[C] Date: 6 Oct 1998 04:38:40 -0500 [C] Date: 6 Oct 1998 04:38:40 -0500
[C] Organization: Nowhere, To [C] Organization: Nowhere, To
[C] Message-ID: <i.am.a.test.article@nowhere.to> [C] Message-ID: <i.am.a.test.article@nowhere.to>
[C] [C]
[C] This is just a test article. [C] This is just a test article.
[C] . [C] .
[S] 435 Don't send it again [S] 435 Don't send it again
9.4 The LIST Keyword 9.4 The LIST Keyword
9.4.1 LIST 9.4.1 LIST
LIST [ACTIVE [wildmat]] LIST [ACTIVE [wildmat]]
The response to the LIST keyword with no parameters returns a The response to the LIST keyword with no parameters returns a
list of valid news groups and associated information. Each list of valid news groups and associated information. Each
news group is sent as a line of text in the following format: news group is sent as a line of text in the following format:
group first last status group first last status
where <group> is the name of the news group, <last> is the where <group> is the name of the news group, <last> is the
number of the last known article currently in that news group, number of the last known article currently in that news group,
<first> is the number of the first article currently in the <first> is the number of the first article currently in the
news group, and <status> indicates the current status of the news group, and <status> indicates the current status of the
group on this server. Typically, the <status> will be consist group on this server. Typically, the <status> will be consist
of the US-ASCII character 'y' where posting is permitted, 'n' of the US-ASCII character 'y' where posting is permitted, 'n'
where posting is not permitted and 'm' where postings will be where posting is not permitted and 'm' where postings will be
forwarded to the news group moderator by the news server. forwarded to the newsgroup moderator by the news server. Other
Other status strings may exist. The definition of these other status strings may exist. The definition of these other values
values and the circumstances under which they are returned is and the circumstances under which they are returned is covered
covered in other specifications. in other specifications.
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The <first> and <last> fields will always be numeric. They The <first> and <last> fields will always be numeric. They
may have leading zeros. The <first> field corresponds to the may have leading zeros. The <first> field corresponds to the
"reported low water mark" and the <last> field corresponds to "reported low water mark" and the <last> field corresponds to
the "reported high water mark" described in the GROUP command the "reported high water mark" described in the GROUP command
(see Section 9.1.1.1). (see Section 9.1.1.1).
The status of a news group only indicates how posts to that The status of a news group only indicates how posts to that
news group are processed. It does not if the current client is newsgroup are processed. It does not indicate if the current
permitted to post. That is indicated by the status code client is permitted to post. That is indicated by the status
returned as part of the greeting. code returned as part of the greeting.
Please note that an empty list (i.e., the text body returned Please note that an empty list (i.e., the text body returned
by this command consists only of the terminating period) is a by this command consists only of the terminating period) is a
possible valid response, and indicates that there are possible valid response, and indicates that there are
currently no valid news groups. currently no valid news groups.
If the optional wildmat parameter is specified, the list is If the optional wildmat parameter is specified, the list is
limited to only the groups that match the pattern. limited to only the groups that match the pattern.
Specifying a single group is usually very efficient for the Specifying a single group is usually very efficient for the
skipping to change at line 1784 skipping to change at line 2114
server. Multiple groups may be specified by using wildmat server. Multiple groups may be specified by using wildmat
patterns (described in section 5). patterns (described in section 5).
9.4.1.1 Responses 9.4.1.1 Responses
215 list of news groups follows 215 list of news groups follows
9.4.1.2 Examples 9.4.1.2 Examples
Example of LIST returning a list of news groups Example of LIST returning a list of news groups
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LIST [C] LIST
[S] 215 list of news groups follows [S] 215 list of news groups follows
[S] misc.test 3000234 3002322 y [S] misc.test 3000234 3002322 y
[S] alt.fc-writers.recovery 1 4 y [S] alt.fc-writers.recovery 1 4 y
[S] tx.natives.recovery 56 89 y [S] tx.natives.recovery 56 89 y
[S] . [S] .
Example of LIST returning no news groups Example of LIST returning no news groups
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LIST [C] LIST
[S] 215 list of news groups follows [S] 215 list of news groups follows
[S] . [S] .
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9.4.2 LIST ACTIVE.TIMES 9.4.2 LIST ACTIVE.TIMES
LIST ACTIVE.TIMES [wildmat] LIST ACTIVE.TIMES [wildmat]
The active.times file is maintained by some news transport The active.times file is maintained by some news transport
systems to contain information about who created a particular systems to contain information about who created a particular
news group and when. The format of this file includes three news group and when. The format of this file includes three
fields. The first field is the name of the news group. The fields. The first field is the name of the news group. The
second is the time when this group was created on this news second is the time when this group was created on this news
server measured in seconds since the start of January 1, 1970. server measured in seconds since the start of January 1, 1970.
skipping to change at line 1832 skipping to change at line 2173
If the optional wildmat parameter is specified, the list is If the optional wildmat parameter is specified, the list is
limited to only the groups that match the pattern. limited to only the groups that match the pattern.
Specifying a single group is usually very efficient for the Specifying a single group is usually very efficient for the
server. Multiple groups may be specified by using wildmat server. Multiple groups may be specified by using wildmat
patterns (described in section 5). patterns (described in section 5).
9.4.2.1 Responses 9.4.2.1 Responses
215 information follows 215 information follows
501 Syntax error 501 Syntax error
503 program error, function not performed 503 program error, function not performed
9.4.2.2 Examples 9.4.2.2 Examples
Example of LIST ACTIVE.TIMES returning a list of news groups Example of LIST ACTIVE.TIMES returning a list of news groups
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LIST ACTIVE.TIMES [C] LIST ACTIVE.TIMES
[S] 215 information follows [S] 215 information follows
[S] misc.test 930445408 <creatme@isc.org> [S] misc.test 930445408 <creatme@isc.org>
[S] alt.rfc-writers.recovery 930562309 <m@nowhere.to> [S] alt.rfc-writers.recovery 930562309 <m@nowhere.to>
[S] tx.natives.recovery 930678923 <sob@academ.com> [S] tx.natives.recovery 930678923 <sob@academ.com>
[S] . [S] .
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Example of LIST ACTIVE.TIMES returning an error (The server Example of LIST ACTIVE.TIMES returning an error (The server
software is not configured to maintain this information, but software is not configured to maintain this information, but
does recognize the command as valid.) does recognize the command as valid.)
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LIST ACTIVE.TIMES [C] LIST ACTIVE.TIMES
[S] 503 program error, function not performed [S] 503 program error, function not performed
Example of LIST ACTIVE.TIMES sent to a server that does not Example of LIST ACTIVE.TIMES sent to a server that does not
recognize this argument (e.g. The software does not maintain recognize this argument (e.g. The software does not maintain
this information.) this information.)
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LIST ACTIVE.TIMES [C] LIST ACTIVE.TIMES
[S] 501 Syntax Error [S] 501 Syntax Error
9.4.3 LIST DISTRIBUTIONS 9.4.3 LIST DISTRIBUTIONS
LIST DISTRIBUTIONS LIST DISTRIBUTIONS
The distributions file is maintained by some news transport The distributions file is maintained by some news transport
systems to contain information about valid values for the systems to contain information about valid values for the
Distribution: line in a news article header and about what the Distribution: line in a news article header and about what the
values mean. Each line contains two fields, the value and a values mean. Each line contains two fields, the value and a
skipping to change at line 1887 skipping to change at line 2241
the information is displayed following the 215 response. When the information is displayed following the 215 response. When
display is completed, the server will send a period on a line display is completed, the server will send a period on a line
by itself. If the information is not available, the server by itself. If the information is not available, the server
will return the 503 error response. If the server does not will return the 503 error response. If the server does not
recognize this command, it SHOULD return the 501 error recognize this command, it SHOULD return the 501 error
response. response.
9.4.3.1 Responses 9.4.3.1 Responses
215 information follows 215 information follows
501 Syntax error 501 Syntax error
503 program error, function not performed 503 program error, function not performed
9.4.3.2 Examples 9.4.3.2 Examples
Example of LIST DISTRIBUTIONS returning a list of news groups Example of LIST DISTRIBUTIONS returning a list of news groups
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LIST DISTRIBUTIONS [C] LIST DISTRIBUTIONS
[S] 215 information follows [S] 215 information follows
[S] usa United States of America [S] usa United States of America
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[S] na North America [S] na North America
[S] world All over the World [S] world All over the World
[S] . [S] .
Example of LIST DISTRIBUTIONS returning an error (e.g. The Example of LIST DISTRIBUTIONS returning an error (e.g. The
server software is not configured to maintain this server software is not configured to maintain this
information, but does recognize the command as valid.) information, but does recognize the command as valid.)
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LIST DISTRIBUTIONS [C] LIST DISTRIBUTIONS
[S] 503 program error, function not performed [S] 503 program error, function not performed
Example of LIST DISTRIBUTIONS sent to a server that does not Example of LIST DISTRIBUTIONS sent to a server that does not
recognize the command (e.g. The server does not maintain this recognize the command (e.g. The server does not maintain this
information regardless of configuration.) information regardless of configuration.)
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LIST DISTRIBUTIONS [C] LIST DISTRIBUTIONS
[S] 501 Syntax Error [S] 501 Syntax Error
9.4.4 LIST DISTRIB.PATS 9.4.4 LIST DISTRIB.PATS
LIST DISTRIB.PATS LIST DISTRIB.PATS
The distrib.pats file is maintained by some news transport The distrib.pats file is maintained by some news transport
systems to allow clients to choose a value for the systems to allow clients to choose a value for the
Distribution: line in the header of a news article being Distribution: line in the header of a news article being
posted. The information returned consists of lines, in no posted. The information returned consists of lines, in no
skipping to change at line 1949 skipping to change at line 2318
When executed, the information is displayed following the 215 When executed, the information is displayed following the 215
response. When display is completed, the server will send a response. When display is completed, the server will send a
period on a line by itself. If the information is not period on a line by itself. If the information is not
available, the server will return the 503 error response. If available, the server will return the 503 error response. If
this command is not recognized, the server SHOULD return the this command is not recognized, the server SHOULD return the
501 error response. 501 error response.
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9.4.4.1 Responses 9.4.4.1 Responses
215 information follows 215 information follows
501 Syntax error 501 Syntax error
503 program error, function not performed 503 program error, function not performed
9.4.4.2 Examples 9.4.4.2 Examples
Example of LIST DISTRIB.PATS returning a list of news groups Example of LIST DISTRIB.PATS returning a list of news groups
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LIST DISTRIB.PATS [C] LIST DISTRIB.PATS
[S] 215 information follows [S] 215 information follows
[S] 10:local.*:local [S] 10:local.*:local
[S] . [S] .
Example of LIST DISTRIB.PATS returning an error (e.g. The Example of LIST DISTRIB.PATS returning an error (e.g. The
server software is not configured to maintain this server software is not configured to maintain this
information, but does recognize the command as valid.) information, but does recognize the command as valid.)
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LIST DISTRIB.PATS [C] LIST DISTRIB.PATS
[S] 503 program error, function not performed [S] 503 program error, function not performed
Example of LIST DISTRIB.PATS sent to a server that does not Example of LIST DISTRIB.PATS sent to a server that does not
recognize the command (e.g. The software does not maintain recognize the command (e.g. The software does not maintain
this information regardless of configuration.) this information regardless of configuration.)
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LIST DISTRIB.PATS [C] LIST DISTRIB.PATS
[S] 501 Syntax Error [S] 501 Syntax Error
9.4.5 LIST NEWSGROUPS 9.4.5 LIST NEWSGROUPS
LIST NEWSGROUPS [wildmat] LIST NEWSGROUPS [wildmat]
The newsgroups file is maintained by some news transport The newsgroups file is maintained by some news transport
systems to contain the name of each news group that is systems to contain the name of each news group that is
active on the server and a short description about the active on the server and a short description about the
purpose of each news group. Each line in the file contains purpose of each news group. Each line in the file contains
skipping to change at line 2001 skipping to change at line 2381
two fields, the news group name and a short explanation of two fields, the news group name and a short explanation of
the purpose of that news group. When executed, the the purpose of that news group. When executed, the
information is displayed following the 215 response. When information is displayed following the 215 response. When
display is completed, the server will send a period on a display is completed, the server will send a period on a
line by itself. If the information is not available, the line by itself. If the information is not available, the
server will return the 503 response. If the server does not server will return the 503 response. If the server does not
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recognize the command it should return a 501 response. If recognize the command it should return a 501 response. If
the optional matching parameter is specified, the list is the optional matching parameter is specified, the list is
limited to only the groups that match the pattern (no limited to only the groups that match the pattern (no
matching is done on the group descriptions). Specifying a matching is done on the group descriptions). Specifying a
single group is usually very efficient for the server, and single group is usually very efficient for the server, and
multiple groups may be specified by using a wildmat(see multiple groups may be specified by using a wildmat(see
section 5), not regular expressions. If nothing is matched section 5), not regular expressions. If nothing is matched
an empty list is returned, not an error. an empty list is returned, not an error.
9.4.5.1 Responses 9.4.5.1 Responses
skipping to change at line 2050 skipping to change at line 2441
Each of the following sections describes an extension that a Each of the following sections describes an extension that a
server MAY provide. If the server provides the extension, it server MAY provide. If the server provides the extension, it
MUST include the appropriate extension label in the response MUST include the appropriate extension label in the response
to LIST EXTENSIONS. If it does not provide it, it MUST NOT to LIST EXTENSIONS. If it does not provide it, it MUST NOT
include the appropriate extension label. The descriptions of include the appropriate extension label. The descriptions of
facilities in each section are written as if the extension is facilities in each section are written as if the extension is
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provided. If it is not provided, the entire section should be provided. If it is not provided, the entire section should be
ignored. ignored.
9.5.1 LISTGROUP extension 9.5.1 LISTGROUP extension
This extension provides one command and has the extension This extension provides one command and has the extension
label LISTGROUP. label LISTGROUP.
9.5.1.1 The LISTGROUP Command 9.5.1.1 The LISTGROUP Command
LISTGROUP [ggg] LISTGROUP [ggg]
The LISTGROUP command is used to get a listing of all the The LISTGROUP command is used to get a listing of all the
article numbers in a particular news group. article numbers in a particular news group.
The optional parameter ggg is the name of the news group to The optional parameter ggg is the name of the news group to
be selected (e.g. "news.software.b"). A list of valid news be selected (e.g. "news.software.b"). A list of valid
groups may be obtained from the LIST command. If no group newsgroups may be obtained from the LIST command. If no
is specified, the current group is used as the default group is specified, the current group is used as the
argument. default argument.
The successful selection response will be a list of the The successful selection response will be a list of the
article numbers in the group followed by a period on a line article numbers in the group followed by a period on a line
by itself. The list starts on the next line following the by itself. The list starts on the next line following the
211 response code. 211 response code.
When a valid group is selected by means of this command, When a valid group is selected by means of this command,
the internally maintained "current article pointer" MUST be the internally maintained "current article pointer" MUST be
set to the first article in the group and the name of the set to the first article in the group and the name of the
current news group MUST be set to the selected news group current news group MUST be set to the selected news group
name. If an invalid group is specified, the previously name. If an invalid group is specified, the previously
selected group and article remain selected. If an empty selected group and article remain selected. If an empty
news group is selected, the "current article pointer" may newsgroup is selected, the "current article pointer" may be
be in an indeterminate state and should not be used. in an indeterminate state and should not be used.
The LISTGROUP keyword MAY be used by a client as a The LISTGROUP keyword MAY be used by a client as a
replacement for the GROUP command in establishing a valid replacement for the GROUP command in establishing a valid
"current article pointer." After a successful response is "current article pointer." After a successful response is
received, any other command may be used that depends on received, any other command may be used that depends on
having the "current article pointer" be valid. having the "current article pointer" be valid.
The group name MUST match a news group obtained from the The group name MUST match a news group obtained from the
LIST command or an error will result, else the server will LIST command or an error will result, else the server will
respond with the 411 error code. respond with the 411 error code.
A server that does not implement this command SHOULD return A server that does not implement this command SHOULD return
a 500 error response. a 500 error response.
9.5.1.1.1 Responses 9.5.1.1.1 Responses
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211 list of article numbers follow 211 list of article numbers follow
411 No such group 411 No such group
412 Not currently in news group 412 Not currently in news group
500 Command not recognized 500 Command not recognized
9.5.1.1.2 Examples 9.5.1.1.2 Examples
Example of a successful execution with a group that exists on Example of a successful execution with a group that exists on
the server the server
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LISTGROUP misc.test [C] LISTGROUP misc.test
[S] 211 list of article numbers follow [S] 211 list of article numbers follow
[S] 3000234 [S] 3000234
[S] 3000237 [S] 3000237
[S] 3000238 [S] 3000238
[S] 3000239 [S] 3000239
[S] 3002322 [S] 3002322
[S] . [S] .
Example of an unsuccessful execution with a group that does Example of an unsuccessful execution with a group that does
not exist on the server not exist on the server
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LISTGROUP this.group.is.not.here [C] LISTGROUP this.group.is.not.here
[S] 411 no such group [S] 411 no such group
Example of an attempt to retrieve an article when the current Example of an attempt to retrieve an article when the current
group selected is empty group selected is empty
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LISTGROUP example.empty.newsgroup [C] LISTGROUP example.empty.newsgroup
[S] 412 No current article selected [S] 412 No current article selected
9.5.2 The OVER Extension 9.5.2 The OVER Extension
This extension provides two commands, OVER and LIST This extension provides two commands, OVER and LIST
OVERVIEW.FMT. The label for this extension is OVER. OVERVIEW.FMT. The label for this extension is OVER.
9.5.2.1 LIST OVERVIEW.FMT 9.5.2.1 LIST OVERVIEW.FMT
LIST OVERVIEW.FMT LIST OVERVIEW.FMT
skipping to change at line 2151 skipping to change at line 2561
This extension provides two commands, OVER and LIST This extension provides two commands, OVER and LIST
OVERVIEW.FMT. The label for this extension is OVER. OVERVIEW.FMT. The label for this extension is OVER.
9.5.2.1 LIST OVERVIEW.FMT 9.5.2.1 LIST OVERVIEW.FMT
LIST OVERVIEW.FMT LIST OVERVIEW.FMT
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The overview.fmt file is maintained by some news transport The overview.fmt file is maintained by some news transport
systems to contain the order in which header information is systems to contain the order in which header information is
stored in the overview databases for each news group. When stored in the overview databases for each news group. When
executed, news article header fields are displayed one line at executed, news article header fields are displayed one line at
a time in the order in which they are stored in the overview a time in the order in which they are stored in the overview
database[6] following the 215 response. When display is database[6] following the 215 response. When display is
completed, the server will send a period on a line by itself. completed, the server will send a period on a line by itself.
If the information is not available, the server will return If the information is not available, the server will return
the 503 response. the 503 response.
If the header has the word "full" (without quotes) after the If the header has the word "full" (without quotes) after the
colon, the header's name is prepended to its field in the colon, the header's name is prepended to its field in the
output returned by the server. output returned by the server.
This is command is part of the optional OVER extension which This is command is part of the optional OVER extension which
includes the OVER command defined in section . If the OVER includes the OVER command defined in section . If the OVER
extension is not implemented, then this command MUST NOT be extension is not implemented, then this command MUST NOT be
skipping to change at line 2176 skipping to change at line 2590
This is command is part of the optional OVER extension which This is command is part of the optional OVER extension which
includes the OVER command defined in section . If the OVER includes the OVER command defined in section . If the OVER
extension is not implemented, then this command MUST NOT be extension is not implemented, then this command MUST NOT be
implemented. If that case, the server MUST return a 501 error implemented. If that case, the server MUST return a 501 error
response when this command is presented by the client. response when this command is presented by the client.
9.5.2.1.1 Responses 9.5.2.1.1 Responses
215 information follows 215 information follows
501 Syntax Error 501 Syntax Error
503 program error, function not performed 503 program error, function not performed
9.5.2.1.2 Examples 9.5.2.1.2 Examples
Example of LIST OVERVIEW.FMT returning a list of news groups Example of LIST OVERVIEW.FMT returning a list of news groups
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LIST OVERVIEW.FMT [C] LIST OVERVIEW.FMT
[S] 215 Order of fields in overview database. [S] 215 Order of fields in overview database.
[S] Subject: [S] Subject:
[S] From: [S] From:
[S] Date: [S] Date:
[S] Message-ID: [S] Message-ID:
[S] . [S] .
Example of LIST OVERVIEW.FMT returning an error Example of LIST OVERVIEW.FMT returning an error
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] LIST OVERVIEW.FMT [C] LIST OVERVIEW.FMT
[S] 503 program error, function not performed [S] 503 program error, function not performed
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9.5.2.2 OVER 9.5.2.2 OVER
OVER [range] OVER [range]
The OVER command returns specific header information for the The OVER command returns specific header information for the
article(s) specified from the current selected group. The article(s) specified from the current selected group. The
information returned in the response to this command can be information returned in the response to this command can be
used by clients to follow discussion threads. used by clients to follow discussion threads.
The optional range argument may be any of the following: The optional range argument may be any of the following:
o an article number o an article number
o an article number followed by a dash to indicate all o an article number followed by a dash to indicate all
following following
o an article number followed by a dash followed by another o an article number followed by a dash followed by another
article number article number
If no argument is specified, then information from the current If no argument is specified, then information from the current
article is displayed. Successful responses start with a 224 article is displayed. Successful responses start with a 224
response followed by the overview information for all matched response followed by the overview information for all matched
messages. Once the output is complete, a period is sent on a messages. Once the output is complete, a period is sent on a
line by itself. If no argument is specified, the information line by itself. If no argument is specified, the information
for the current article is returned. A news group must have for the current article is returned. A news group must have
been selected earlier, else a 412 error response is returned. been selected earlier, else a 412 error response is returned.
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sequence of trailing US-ASCII tabs may be omitted). Any sequence of trailing US-ASCII tabs may be omitted). Any
sequence of US-ASCII space or non-printing characters in a sequence of US-ASCII space or non-printing characters in a
field MUST be replaced by a single US-ASCII space. field MUST be replaced by a single US-ASCII space.
The server SHOULD not produce output for articles that no The server SHOULD not produce output for articles that no
longer exist. longer exist.
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9.5.2.2.1 Responses 9.5.2.2.1 Responses
224 Overview information follows 224 Overview information follows
412 No news group current selected 412 No news group current selected
420 No article(s) selected 420 No article(s) selected
500 Command not recognized 500 Command not recognized
502 Service Unavailable 502 Service Unavailable
9.5.2.2.2 Examples 9.5.2.2.2 Examples
Example of a successful retrieval of overview information for Example of a successful retrieval of overview information for
an article (using no article number) an article (using no article number)
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] OVER [C] OVER
[S] 224 Overview information follows [S] 224 Overview information follows
300234|I am just a test article|nobody@nowhere.to 300234|I am just a test article|nobody@nowhere.to
(Demo User)|6 Oct 1998 04:38:40 -0500| (Demo User)|6 Oct 1998 04:38:40 -0500|
<45223423@to.to> <45223423@to.to>
[S] . [S] .
[Please note that the line that begins with 300234 is all one [Please note that the line that begins with 300234 is all one
line that has been wrapped for readability. A vertical bar has line that has been wrapped for readability. A vertical bar has
been inserted to show where the US-ASCII TAB should actually been inserted to show where the US-ASCII TAB should actually
be.] be.]
Example of an unsuccessful retrieval of overview information Example of an unsuccessful retrieval of overview information
on an article by number on an article by number
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] OVER 300256 [C] OVER 300256
[S] 420 No such article in this group [S] 420 No such article in this group
Example of an unsuccessful retrieval of overview information Example of an unsuccessful retrieval of overview information
by number because no news group was selected first by number because no news group was selected first
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] OVER [C] OVER
[S] 412 No news group selected [S] 412 No news group selected
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Example of an attempt to retrieve an article when the current Example of an attempt to retrieve an article when the current
group selected is empty group selected is empty
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP example.empty.newsgroup [C] GROUP example.empty.newsgroup
[S] 211 0 0 0 example.empty.newsgroup [S] 211 0 0 0 example.empty.newsgroup
[C] OVER [C] OVER
[S] 420 No current article selected [S] 420 No current article selected
9.5.3 The PAT Extension 9.5.3 The PAT Extension
This extension provides one new command, PAT. The label for This extension provides one new command, PAT. The label for
this extension is PAT. this extension is PAT.
9.5.3.1 PAT 9.5.3.1 PAT
PAT header range|<message-id> [wildmat] PAT header range|<message-id> [wildmat]
skipping to change at line 2352 skipping to change at line 2809
each article where the relevant header line matches one or each article where the relevant header line matches one or
more of the wildmats. The line consists of the article number, more of the wildmats. The line consists of the article number,
a US-ASCII space, and then the contents of the header (without a US-ASCII space, and then the contents of the header (without
the header name). A valid response includes an empty list the header name). A valid response includes an empty list
(indicating that there were no matches). Once the output is (indicating that there were no matches). Once the output is
complete, a period is sent on a line by itself. If the complete, a period is sent on a line by itself. If the
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optional argument is a message-id and no such article exists, optional argument is a message-id and no such article exists,
a 430 error response shall be returned. A 502 response shall a 430 error response shall be returned. A 502 response shall
be returned if the client only has permission to transfer be returned if the client only has permission to transfer
articles. A 500 response SHOULD be issued by all servers that articles. A 500 response SHOULD be issued by all servers that
do not recognize this command. do not recognize this command.
9.5.3.1.1 Responses 9.5.3.1.1 Responses
221 Header follows 221 Header follows
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optional argument is a message-id and no such article exists, optional argument is a message-id and no such article exists,
a 430 error response shall be returned. A 502 response shall a 430 error response shall be returned. A 502 response shall
be returned if the client only has permission to transfer be returned if the client only has permission to transfer
articles. A 500 response SHOULD be issued by all servers that articles. A 500 response SHOULD be issued by all servers that
do not recognize this command. do not recognize this command.
9.5.3.1.1 Responses 9.5.3.1.1 Responses
221 Header follows 221 Header follows
412 no newsgroup selected 412 no newsgroup selected
430 no such article 430 no such article
500 Command not recognized 500 Command not recognized
502 Service Unavailable 502 Service Unavailable
9.5.3.1.2 Examples 9.5.3.1.2 Examples
Example of a successful retrieval of subject lines from a Example of a successful retrieval of subject lines from a
range of articles range of articles
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] PAT Subject 3000234-300238 [C] PAT Subject 3000234-300238
[S] 221 Header Follows [S] 221 Header Follows
[S] 3000234 I am just a test article [S] 3000234 I am just a test article
[S] 3000237 Re: I am just a test article [S] 3000237 Re: I am just a test article
[S] 3000238 Ditto [S] 3000238 Ditto
[S] . [S] .
Example of a successful retrieval of subject lines from a Example of a successful retrieval of subject lines from a
range of articles with header pattern matching range of articles with header pattern matching
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] PAT Subject 3000234-300238 *j* [C] PAT Subject 3000234-300238 *j*
[S] 221 Header Follows [S] 221 Header Follows
[S] 3000234 I am just a test article [S] 3000234 I am just a test article
[S] 3000237 Re: I am just a test article [S] 3000237 Re: I am just a test article
[S] . [S] .
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Example of a successful retrieval of header from an article by Example of a successful retrieval of header from an article by
message-id message-id
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP misc.test [C] GROUP misc.test
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] PAT subject <i.am.a.test.article@nowhere.to> [C] PAT subject <i.am.a.test.article@nowhere.to>
[S] 221 Header information follows [S] 221 Header information follows
[S] 3000345 I am just a test article [S] 3000345 I am just a test article
[S] . [S] .
Example of an unsuccessful retrieval of a header from an Example of an unsuccessful retrieval of a header from an
article by message-id article by message-id
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] PAT subject <i.am.not.there@nowhere.to> [C] PAT subject <i.am.not.there@nowhere.to>
[S] 430 No Such Article Found [S] 430 No Such Article Found
Example of an unsuccessful retrieval of headers from articles Example of an unsuccessful retrieval of headers from articles
by number because no news group was selected first by number because no news group was selected first
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] PAT subject 300256- [C] PAT subject 300256-
[S] 412 No news group selected [S] 412 No news group selected
Example of an unsuccessful retrieval of headers from articles Example of an unsuccessful retrieval of headers from articles
by message-id because no news group was selected first by message-id because no news group was selected first
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] PAT subject <i.am.a.test.article@nowhere.to> [C] PAT subject <i.am.a.test.article@nowhere.to>
[S] 412 No news group selected [S] 412 No news group selected
Example of retrieving header information when the current Example of retrieving header information when the current
group selected is empty group selected is empty
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] GROUP example.empty.newsgroup [C] GROUP example.empty.newsgroup
[S] 211 0 0 0 example.empty.newsgroup [S] 211 0 0 0 example.empty.newsgroup
[C] PAT subject 0- [C] PAT subject 0-
[S] 221 Headers follow [S] 221 Headers follow
. .
Example of a failure due to restrictions configured into the Example of a failure due to restrictions configured into the
server server
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
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. .
Example of a failure due to restrictions configured into the Example of a failure due to restrictions configured into the
server server
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
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[C] GROUP news.group [C] GROUP news.group
[S] 211 1234 3000234 3002322 misc.test [S] 211 1234 3000234 3002322 misc.test
[C] PAT Subject 3000234-300238 [C] PAT Subject 3000234-300238
[S] 502 Service Unavailable [S] 502 Service Unavailable
10. The CONCLUSION Step 10. The CONCLUSION Step
10.1 QUIT 10.1 QUIT
QUIT QUIT
The server process MUST acknowledge the QUIT command and then The server process MUST acknowledge the QUIT command and then
close the connection to the client. This is the preferred close the connection to the client. This is the preferred
skipping to change at line 2495 skipping to change at line 2995
There are other keywords that may be used at any time between There are other keywords that may be used at any time between
the beginning of a session and its termination. Using these the beginning of a session and its termination. Using these
keywords does not alter any state information, but the keywords does not alter any state information, but the
response generated from the use of these keywords may provide response generated from the use of these keywords may provide
useful information to clients that use them. useful information to clients that use them.
11.1 DATE 11.1 DATE
DATE DATE
This command exists to help clients find out the current time This command exists to help clients find out the current time
from the server's perspective. This command SHOULD NOT be from the server's perspective. This command SHOULD NOT be
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used as a substitute for NTP[7], but to provide information used as a substitute for NTP[7], but to provide information
that might be useful when using the NEWNEWS command (see that might be useful when using the NEWNEWS command (see
section 11.4). section 11.4).
This command returns a one-line response code of 111 followed This command returns a one-line response code of 111 followed
by the UTC (or GMT) date and time on the server in the form by the UTC date and time on the server in the form
YYYYMMDDhhmmss. YYYYMMDDhhmmss.
11.1.1 Responses 11.1.1 Responses
111 YYYYMMDDhhmmss 111 YYYYMMDDhhmmss
11.1.2 Example 11.1.2 Example
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] DATE [C] DATE
[S] 111 19990623135624 [S] 111 19990623135624
11.2 The HELP Command 11.2 The HELP Command
HELP HELP
This command provides a short summary of commands that are This command provides a short summary of commands that are
understood by this implementation of the server. The help text understood by this implementation of the server. The help text
will be presented as a textual response terminated by a single will be presented as a textual response terminated by a single
period on a line by itself. period on a line by itself.
skipping to change at line 2541 skipping to change at line 3045
SHALL NOT be used by clients as a replacement for the LIST SHALL NOT be used by clients as a replacement for the LIST
EXTENSIONS command described in section 8.1. EXTENSIONS command described in section 8.1.
11.2.1 Responses 11.2.1 Responses
100 help text follows 100 help text follows
11.2.2 Example 11.2.2 Example
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] HELP [C] HELP
[S] 100 Help text follows [S] 100 Help text follows
[S] This is some help text. There is no specific [S] This is some help text. There is no specific
[S] formatting requirement for this test, though [S] formatting requirement for this test, though
[S] it is customary for it to list the valid commands [S] it is customary for it to list the valid commands
[S] and give a brief definition of what they do [S] and give a brief definition of what they do
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[S] . [S] .
11.3 NEWGROUPS 11.3 NEWGROUPS
NEWGROUPS date time [GMT|UTC] NEWGROUPS date time [GMT|UTC]
A list of newsgroups created since <date and time> MUST be A list of newsgroups created since <date and time> MUST be
listed in the same format as the LIST command. listed in the same format as the LIST command.
The date is sent as 6 or 8 digits in the format [XX]YYMMDD, The date is sent as 6 or 8 digits in the format [XX]YYMMDD,
skipping to change at line 2597 skipping to change at line 3107
11.3.1 Responses 11.3.1 Responses
231 list of new newsgroups follows 231 list of new newsgroups follows
11.3.2 Examples 11.3.2 Examples
Example where there are new groups Example where there are new groups
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] NEWGROUPS 19990624 000000 UTC [C] NEWGROUPS 19990624 000000 UTC
[S] 230 list of new newsgroups follows [S] 230 list of new newsgroups follows
[S] alt.rfc-writers.recovery [S] alt.rfc-writers.recovery
[S] tx.natives.recovery [S] tx.natives.recovery
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[S] . [S] .
Example where there are no new groups Example where there are no new groups
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] NEWGROUPS 19990624 000000 UTC [C] NEWGROUPS 19990624 000000 UTC
[S] 230 list of new newsgroups follows [S] 230 list of new newsgroups follows
[S] . [S] .
11.4 NEWNEWS 11.4 NEWNEWS
NEWNEWS newsgroups date time [GMT] NEWNEWS newsgroups date time [GMT|UTC]
A list of message-ids of articles posted or received to the A list of message-ids of articles posted or received to the
specified news group or groups since "date" will be listed. specified newsgroup or groups since "date" will be listed. The
The format of the listing will be one message-id per line, as format of the listing will be one message-id per line, as
though text were being sent. Each message-id SHALL appear only though text were being sent. Each message-id SHALL appear only
once in a response. The order of the response has no specific once in a response. The order of the response has no specific
significance and may vary from response to response in the significance and may vary from response to response in the
same session. A single line consisting solely of one period same session. A single line consisting solely of one period
followed by CR-LF will terminate the list. followed by CR-LF will terminate the list.
Date and time are in the same format as the NEWGROUPS command. Date and time are in the same format as the NEWGROUPS command.
The newsgroups parameter MUST be in wildmat format and MAY The newsgroups parameter MUST be in wildmat format and MAY
consist of multiple wildmat constructs separated by an US- consist of multiple wildmat constructs separated by an US-
ASCII comma character. ASCII comma character.
Note that an empty list (i.e., the text body returned by this Note that an empty list (i.e., the text body returned by this
command consists only of the terminating period) is a possible command consists only of the terminating period) is a possible
valid response, and indicates that there is currently no new valid response, and indicates that there is currently no new
news. news.
Clients SHOULD make all queries in GMT/UTC time when possible. Clients SHOULD make all queries in UTC time when possible.
11.4.1 Responses 11.4.1 Responses
230 list of new articles by message-id follows 230 list of new articles by message-id follows
11.4.2 Examples 11.4.2 Examples
Example where there are new articles Example where there are new articles
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
skipping to change at line 2650 skipping to change at line 3168
11.4.1 Responses 11.4.1 Responses
230 list of new articles by message-id follows 230 list of new articles by message-id follows
11.4.2 Examples 11.4.2 Examples
Example where there are new articles Example where there are new articles
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] NEWNEWS news.*,sci.* 19990624 000000 [C] NEWNEWS news.*,sci.* 19990624 000000
[S] 230 list of new articles by message-id follows [S] 230 list of new articles by message-id follows
[S] <i.am.a.new.article@nowhere.to> [S] <i.am.a.new.article@nowhere.to>
[S] <i.am.another.new.article@nowhere.to> [S] <i.am.another.new.article@nowhere.to>
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Example where there are no new articles Example where there are no new articles
[S] 200 NNTP Service Ready [S] 200 NNTP Service Ready
[C] NEWNEWS alt.* 19990624 000000 [C] NEWNEWS alt.* 19990624 000000
[S] 230 list of new articles by message-id follows [S] 230 list of new articles by message-id follows
[S] . [S] .
12. Framework for NNTP Extensions 12. Framework for NNTP Extensions
Although NNTP is widely and robustly deployed, some parts of Although NNTP is widely and robustly deployed, some parts of
the Internet community might wish to extend the NNTP service. the Internet community might wish to extend the NNTP service.
This memo defines a means whereby an extended NNTP client may This memo defines a means whereby an extended NNTP client may
query the server to determine the service extensions that it query the server to determine the service extensions that it
supports. supports.
skipping to change at line 2695 skipping to change at line 3219
benefits, must be carefully scrutinized with respect to its benefits, must be carefully scrutinized with respect to its
implementation, deployment, and interoperability costs. In implementation, deployment, and interoperability costs. In
many cases, the cost of extending the NNTP service will likely many cases, the cost of extending the NNTP service will likely
outweigh the benefit. outweigh the benefit.
Given this environment, the framework for the extensions Given this environment, the framework for the extensions
described in this memo consists of: described in this memo consists of:
a)a mechanism for clients to determine a server's available a)a mechanism for clients to determine a server's available
extensions extensions
b)a registry of NNTP service extensions b)a registry of NNTP service extensions
The LIST EXTENSIONS command is described in section 8.1 of The LIST EXTENSIONS command is described in section 8.1 of
this memo and is the mechanism for clients to use to determine this memo and is the mechanism for clients to use to determine
what extensions are available for client use. what extensions are available for client use.
The IANA shall maintain a registry of NNTP service extensions. The IANA shall maintain a registry of NNTP service extensions.
An extension is identified by an unique extension-label, which An extension is identified by a unique extension-label, which
is an string of 1 to 12 uppercase letters. The extension-label is an string of 1 to 12 uppercase letters. The extension-label
will often be the name of a new command that the extension will often be the name of a new command that the extension
adds. However this is not a requirement: an extension might adds. However this is not a requirement: an extension might
not add any new commands or keywords. not add any new commands or keywords.
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An extension is either a private extension or else it is An extension is either a private extension or else it is
included in the IANA registry and is defined in an RFC. Such included in the IANA registry and is defined in an RFC. Such
RFCs either must be on the standards-track or must define an RFCs either must be on the standards-track or must define an
IESG-approved experimental protocol. IESG-approved experimental protocol.
The definition of an extension must include: The definition of an extension must include:
o a descriptive name for the extension o a descriptive name for the extension
o the extension-label (which is returned by LIST EXTENSIONS o the extension-label (which is returned by LIST EXTENSIONS
to to indicate to the client that the server supports this
o indicate to the client that the server supports this
particular extension) particular extension)
o the syntax, values, and meanings of any parameters o the syntax, values, and meanings of any parameters
following the extension-label in the output of LIST following the extension-label in the output of LIST
EXTENSIONS EXTENSIONS
o any new NNTP keywords associated with the extension o any new NNTP keywords associated with the extension
o the syntax and possible values of parameters associated o the syntax and possible values of parameters associated
with the new NNTP keywords with the new NNTP keywords
o any new parameters the extension associates with any o any new parameters the extension associates with any
other pre-existing NNTP keywords other pre-existing NNTP keywords
o how support for the extension affects the behavior of a o how support for the extension affects the behavior of a
server and client NNTP server and client NNTP
o any increase in the maximum length of commands over the o any increase in the maximum length of commands over the
value specified in this memo value specified in this memo
The extension-label of private extensions MUST begin with "X". The extension-label of private extensions MUST begin with "X".
The extension-label of registered extensions MUST NOT begin The extension-label of registered extensions MUST NOT begin
with "X". with "X".
Any keyword values presented in the NNTP response that do not Any keyword values presented in the NNTP response that do not
begin with "X" MUST correspond to a standard, standards-track, begin with "X" MUST correspond to a standard, standards-track,
or IESG-approved experimental NNTP service extension or IESG-approved experimental NNTP service extension
skipping to change at line 2762 skipping to change at line 3297
EXTENSIONS command. EXTENSIONS command.
A server MAY provide additional keywords - either new commands A server MAY provide additional keywords - either new commands
or new parameters to existing commands - as part of a private or new parameters to existing commands - as part of a private
extension. These new keywords MUST begin with "X". extension. These new keywords MUST begin with "X".
A server MUST NOT send different response codes to basic NNTP A server MUST NOT send different response codes to basic NNTP
commands documented here or commands documented in registered commands documented here or commands documented in registered
extensions in response to the availability or use of a private extensions in response to the availability or use of a private
extension. extension.
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12.1 Initial IANA Registry 12.1 Initial IANA Registry
The IANA's initial registry of NNTP service extensions The IANA's initial registry of NNTP service extensions
consists of these entries: consists of these entries:
Service Extension NNTP Extension Label Added Behavior Service Extension NNTP Extension Label Added Behavior
----------------- -------------------- ---------------
Overview Support OVER Defined in this Overview Support OVER Defined in this
document document
Specific Article LISTGROUP Defined in this Specific Article LISTGROUP Defined in this
Numbers document Numbers document
Header Pattern PAT Defined in this Header Pattern PAT Defined in this
Matching document Matching document
13. Augmented BNF[8] Syntax for NNTP Commands 13. Augmented BNF[8] Syntax for NNTP Commands
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list-command / list-command /
listgroup-command / listgroup-command /
mode-reader-command / mode-reader-command /
newgroups-command / newgroups-command /
newnews-command / newnews-command /
next-command / next-command /
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over-command / over-command /
pat-command / pat-command /
post-command / post-command /
quit-command / quit-command /
stat-command stat-command
CR = %x0D CR = %x0D
CRLF = CR LF CRLF = CR LF
date-command = "DATE" *WSP CRLF date-command = "DATE" *WSP CRLF
date = 6*8DIGIT date = 6*8DIGIT
DIGIT = %x30-39 DIGIT = %x30-39
group-command = "GROUP" 1*WSP newsgroup *WSP CRLF group-command = "GROUP" 1*WSP newsgroup *WSP CRLF
head-command = "HEAD" [1*WSP (msg-id / article-number)] *WSP head-command = "HEAD" [1*WSP (msg-id / article-number)] *WSP
CRLF CRLF
header = parameter header = parameter
help-command = "HELP" *WSP CRLF help-command = "HELP" *WSP CRLF
HT = %x09 HT = %x09
ihave-command = "IHAVE" 1*WSP msg-id *WSP CRLF ihave-command = "IHAVE" 1*WSP msg-id *WSP CRLF
last-command = "LAST" *WSP CRLF last-command = "LAST" *WSP CRLF
LF = %x0A LF = %x0A
list-active-times-command = "LIST" 1*WSP "ACTIVE.TIMES" list-active-times-command = "LIST" 1*WSP "ACTIVE.TIMES"
[1*WSP wildmat] *WSP CRLF [1*WSP wildmat] *WSP CRLF
list-command = "LIST" [1*WSP "ACTIVE" [1*WSP wildmat]] *WSP list-command = "LIST" [1*WSP "ACTIVE" [1*WSP wildmat]] *WSP
CRLF CRLF
list-distrib-pats-command = "LIST" 1*WSP "DISTRIB.PATS" *WSP list-distrib-pats-command = "LIST" 1*WSP "DISTRIB.PATS" *WSP
CRLF CRLF
list-distributions-command = "LIST" 1*WSP "DISTRIBUTIONS" *WSP list-distributions-command = "LIST" 1*WSP "DISTRIBUTIONS" *WSP
CRLF CRLF
list-extensions-command = "LIST" 1*WSP "EXTENSIONS" *WSP CRLF list-extensions-command = "LIST" 1*WSP "EXTENSIONS" *WSP CRLF
list-newsgroups-command = "LIST" 1*WSP "NEWSGROUPS" [1*WSP list-newsgroups-command = "LIST" 1*WSP "NEWSGROUPS" [1*WSP
wildmat] wildmat] *WSP CRLF
*WSP CRLF
list-overview-fmt-command = "LIST" 1*WSP "OVERVIEW.FMT" *WSP list-overview-fmt-command = "LIST" 1*WSP "OVERVIEW.FMT" *WSP
CRLF CRLF
listgroup-command = "LISTGROUP" [1*WSP newsgroup] *WSP CRLF listgroup-command = "LISTGROUP" [1*WSP newsgroup] *WSP CRLF
mode-reader-command = "MODE" 1*WSP "READER" *WSP CRLF mode-reader-command = "MODE" 1*WSP "READER" *WSP CRLF
msg-id = <defined in RFC822> msg-id = <defined in RFC822>
newgroups-command = "NEWGROUPS" 1*WSP date 1*WSP time [1*WSP newgroups-command = "NEWGROUPS" 1*WSP date 1*WSP time [1*WSP
"GMT"/"UTC"] *WSP CRLF "GMT"/"UTC"] *WSP CRLF
newnews-command = "NEWNEWS" 1*WSP newsgroup *("," newsgroup) newnews-command = "NEWNEWS" 1*WSP newsgroup *("," newsgroup)
1*WSP date 1*WSP time [1*WSP "GMT"/"UTC"] 1*WSP date 1*WSP time [1*WSP "GMT"/"UTC"]
*WSP CRLF *WSP CRLF
newsgroup = parameter newsgroup = parameter
next-command = "NEXT" *WSP CRLF next-command = "NEXT" *WSP CRLF
over-command = "OVER" [1*WSP range] *WSP CRLF over-command = "OVER" [1*WSP range] *WSP CRLF
parameter = 1*(%x21-FF) ; generic command parameter parameter = 1*(%x21-FF) ; generic command parameter
pat-command = "PAT" 1*WSP header 1*WSP (range / msg-id) pat-command = "PAT" 1*WSP header 1*WSP (range / msg-id)
*(1*WSP wildmat) *WSP CRLF *(1*WSP wildmat) *WSP CRLF
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November 2000
post-command = "POST" *WSP CRLF post-command = "POST" *WSP CRLF
quit-command = "QUIT" *WSP CRLF quit-command = "QUIT" *WSP CRLF
range = article-number ["-" [article-number]] range = article-number ["-" [article-number]]
SP = %x20 SP = %x20
stat-command = "STAT" [1*WSP (msg-id / article-number)] *WSP stat-command = "STAT" [1*WSP (msg-id / article-number)] *WSP
CRLF CRLF
time = 6DIGIT time = 6DIGIT
UTF-8-non-ascii = UTF8-2 / UTF8-3 / UTF8-4 / UTF8-5 / UTF8-6 UTF-8-non-ascii = UTF8-2 / UTF8-3 / UTF8-4 / UTF8-5 / UTF8-6
UTF8-1 = %x80-BF UTF8-1 = %x80-BF
UTF8-2 = %xC0-DF UTF8-1 UTF8-2 = %xC0-DF UTF8-1
UTF8-3 = %xE0-EF 2UTF8-1 UTF8-3 = %xE0-EF 2UTF8-1
UTF8-4 = %xF0-F7 3UTF8-1 UTF8-4 = %xF0-F7 3UTF8-1
UTF8-5 = %xF8-FB 4UTF8-1 UTF8-5 = %xF8-FB 4UTF8-1
UTF8-6 = %xFC-FD 5UTF8-1 UTF8-6 = %xFC-FD 5UTF8-1
wildmat = ["!"]1*("*" / "?" / wildmat-exact / wildmat-set / wildmat = ["!"]1*("*" / "?" / wildmat-exact / wildmat-set /
"\" (%x22-7F / UTF-8-non-ascii)) "\" (%x22-7F / UTF-8-non-ascii))
wildmat-exact = %x22-29 / %x2B-3E / %x40-5A / %x5D-7F / UTF-8- wildmat-exact = %x22-29 / %x2B-3E / %x40-5A / %x5D-7F / UTF-8-
non-ascii ; exclude space ! * ? [ \ non-ascii ; exclude space ! * ? [ \
wildmat-non-hyphen = %x21-2C / %x2E-7F / UTF-8-non-ascii ; wildmat-non-hyphen = %x21-2C / %x2E-7F / UTF-8-non-ascii ;
exclude space - exclude space -
wildmat-set = "[" ["^"] ["]" / "-"] *(wildmat-non-hyphen"["-" wildmat-set = "[" ["^"] ["]" / "-"] *(wildmat-non-hyphen"["-"
wildmat-non-hyphen]) ["-"] wildmat-non-hyphen]) ["-"]
WSP = SP / HT WSP = SP / HT
14. Security Considerations 14. Security Considerations
This section is meant to inform application developers, This section is meant to inform application developers,
information providers, and users of the security limitations information providers, and users of the security limitations
in NNTP as described by this document. The discussion does not in NNTP as described by this document. The discussion does not
include definitive solutions to the problems revealed, though include definitive solutions to the problems revealed, though
it does make some suggestions for reducing security risks. it does make some suggestions for reducing security risks.
skipping to change at line 2918 skipping to change at line 3507
14.1 Personal and Proprietary Information 14.1 Personal and Proprietary Information
NNTP, because it was created to distribute network news NNTP, because it was created to distribute network news
articles, will forward whatever information is stored in those articles, will forward whatever information is stored in those
articles. Specification of that information is outside this articles. Specification of that information is outside this
scope of this document, but it is likely that some personal scope of this document, but it is likely that some personal
and/or proprietary information is available in some of those and/or proprietary information is available in some of those
articles. It is very important that designers and implementers articles. It is very important that designers and implementers
provide informative warnings to users so personal and/or provide informative warnings to users so personal and/or
proprietary information is not disclosed inadvertently. proprietary information is not disclosed inadvertently.
Additionally, effective and easily understood mechanisms to Additionally, effective and easily understood mechanisms to
manage the distribution of news articles must be provided to manage the distribution of news articles must be provided to
NNTP Server administrators, so that they are able to report NNTP Server administrators, so that they are able to report
with confidence what information is and is not being forwarded with confidence what information is and is not being forwarded
in news articles passing though their servers. in news articles passing though their servers.
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14.2 Abuse of Server Log Information 14.2 Abuse of Server Log Information
A server is in the position to save session data about a A server is in the position to save session data about a
user's requests that might identify their reading patterns or user's requests that might identify their reading patterns or
subjects of interest. This information is clearly confidential subjects of interest. This information is clearly confidential
in nature and its handling can be constrained by law in in nature and its handling can be constrained by law in
certain countries. People using the NNTP protocol to provide certain countries. People using the NNTP protocol to provide
data are responsible for ensuring that such material is not data are responsible for ensuring that such material is not
distributed without the permission of any individuals that are distributed without the permission of any individuals that are
identifiable by the published results. identifiable by the published results.
skipping to change at line 2974 skipping to change at line 3564
address changes. As network renumbering is expected to become address changes. As network renumbering is expected to become
increasingly common, the possibility of this form of attack increasingly common, the possibility of this form of attack
will grow. Observing this requirement thus reduces this will grow. Observing this requirement thus reduces this
potential security vulnerability. potential security vulnerability.
This requirement also improves the load-balancing behavior of This requirement also improves the load-balancing behavior of
clients for replicated servers using the same DNS name and clients for replicated servers using the same DNS name and
reduces the likelihood of a user's experiencing failure in reduces the likelihood of a user's experiencing failure in
accessing sites which use that strategy. accessing sites which use that strategy.
14.4 Weak Authentication and Access Control
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14.4 Weak Authentication and Access Control
There is no user-based or token-based authentication in the There is no user-based or token-based authentication in the
basic NNTP specification. Access is normally controlled by basic NNTP specification. Access is normally controlled by
server configuration files. Those files specify access by server configuration files. Those files specify access by
using domain names or IP addresses. However, this using domain names or IP addresses. However, this
specification does permit the creation of extensions to the specification does permit the creation of extensions to the
NNTP protocol itself for such purposes. While including such NNTP protocol itself for such purposes. While including such
mechanisms is optional, doing so is strongly encouraged. mechanisms is optional, doing so is strongly encouraged.
Other mechanisms are also available. For example, a proxy Other mechanisms are also available. For example, a proxy
server could be put in place that requires authentication server could be put in place that requires authentication
before connecting via the proxy to the NNTP server. before connecting via the proxy to the NNTP server.
15. References 15. References
[1] Kantor, B and P. Lapsley, "Network News Transfer Protocol", [1] Kantor, B and P. Lapsley, "Network News Transfer Protocol",
RFC-977, U.C. San Diego and U.C. Berkeley. RFC-977, U.C. San Diego and U.C. Berkeley.
[2] Yergeau, F., "UTF-8, a transformation format of ISO 10646", [2] Yergeau, F., "UTF-8, a transformation format of ISO 10646",
RFC 2279, Alis Technologies. RFC 2279, Alis Technologies.
[3] Coded Character Set-7-bit American Standard Code for [3] Coded Character Set-7-bit American Standard Code for
Information Interchange, ANSI x3.4-1986. Information Interchange, ANSI x3.4-1986.
[4] Bradner, Scott, "Key words for use in RFCs to Indicate [4] Bradner, Scott, "Key words for use in RFCs to Indicate
Requirement Levels", RFC-2119, Harvard University. Requirement Levels", RFC-2119, Harvard University.
[5] Salz, Rich, Manual Page for wildmat(3) from the INN 1.4 [5] Salz, Rich, Manual Page for wildmat(3) from the INN 1.4
distribution, UUNET Technologies, Revision 1.10, April, 1992. distribution, UUNET Technologies, Revision 1.10, April, 1992.
[6] Robertson, Rob, "FAQ: Overview database / NOV General [6] Robertson, Rob, "FAQ: Overview database / NOV General
Information", ftp://ftp.uu.net/networking/news/nntp/inn/faq- Information", ftp://ftp.uu.net/networking/news/nntp/inn/faq-
nov.Z, January, 1995. nov.Z, January, 1995.
[7] Mills, David L., "Network Time Protocol (Version 3), [7] Mills, David L., "Network Time Protocol (Version 3),
Specification, Implementation and Analysis", RFC-1305, Specification, Implementation and Analysis", RFC-1305,
University of Delaware, March 1992. University of Delaware, March 1992.
[8] Crocker, D. and Overell, P., "Augmented BNF for Syntax [8] Crocker, D. and Overell, P., "Augmented BNF for Syntax
Specifications: ABNF", RFC-2234, Internet Mail Consortium and Specifications: ABNF", RFC-2234, Internet Mail Consortium and
Demon Internet, Ltd. Demon Internet, Ltd.
16. Notes 16. Notes
UNIX is a registered trademark of the X/Open Consortium. UNIX is a registered trademark of the X/Open Consortium.
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17. Acknowledgments 17. Acknowledgments
The author acknowledges the original authors of NNTP as The author acknowledges the original authors of NNTP as
documented in RFC 977: Brian Kantor and Phil Lapsey. documented in RFC 977: Brian Kantor and Phil Lapsey.
The author gratefully acknowledges the work of the NNTP The author gratefully acknowledges the work of the NNTP
committee chaired by Eliot Lear. The organization of this committee chaired by Eliot Lear. The organization of this
document was influenced by the last available draft from this document was influenced by the last available draft from this
working group. A special thanks to Eliot for generously working group. A special thanks to Eliot for generously
providing the original machine readable sources for that providing the original machine readable sources for that
document. document.
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The author gratefully acknowledges the work of the Marshall The author gratefully acknowledges the work of the Marshall
Rose & John G. Meyers in RFC 1939 and the work of the DRUMS Rose & John G. Meyers in RFC 1939 and the work of the DRUMS
working group, specifically RFC 1869, which is the basis of working group, specifically RFC 1869, which is the basis of
the NNTP extensions mechanism detailed in this document. the NNTP extensions mechanism detailed in this document.
The author gratefully acknowledges the authors of RFC 2616 for The author gratefully acknowledges the authors of RFC 2616 for
providing specific and relevant examples of security issues providing specific and relevant examples of security issues
that should be considered for HTTP. Since many of the same that should be considered for HTTP. Since many of the same
considerations exist for NNTP, those examples that are considerations exist for NNTP, those examples that are
relevant have been included here with some minor rewrites. relevant have been included here with some minor rewrites.
skipping to change at line 3051 skipping to change at line 3648
providing specific and relevant examples of security issues providing specific and relevant examples of security issues
that should be considered for HTTP. Since many of the same that should be considered for HTTP. Since many of the same
considerations exist for NNTP, those examples that are considerations exist for NNTP, those examples that are
relevant have been included here with some minor rewrites. relevant have been included here with some minor rewrites.
The author gratefully acknowledges the comments and additional The author gratefully acknowledges the comments and additional
information provided by the following individuals in preparing information provided by the following individuals in preparing
one of the progenitors of this document: one of the progenitors of this document:
o Wayne Davison <davison@armory.com> o Wayne Davison <davison@armory.com>
o Clive D.W. Feather <clive@demon.net> o Clive D.W. Feather <clive@demon.net>
o Chris Lewis <clewis@bnr.ca> o Chris Lewis <clewis@bnr.ca>
o Tom Limoncelli <tal@mars.superlink.net> o Tom Limoncelli <tal@mars.superlink.net>
o Eric Schnoebelen <eric@egsner.cirr.com> o Eric Schnoebelen <eric@egsner.cirr.com>
o Rich Salz <rsalz@osf.org> o Rich Salz <rsalz@osf.org>
This work was motivated by the work of various newsreader This work was motivated by the work of various newsreader
authors and newsserver authors, which includes those listed authors and newsserver authors, which includes those listed
below: below:
o Rick Adams-Original author of the NNTP extensions to the o Rick Adams-Original author of the NNTP extensions to the
RN newsreader and last maintainer of Bnews RN newsreader and last maintainer of Bnews
o Stan Barber-Original author of the NNTP extensions to the o Stan Barber-Original author of the NNTP extensions to the
newsreaders that are part of Bnews. newsreaders that are part of Bnews.
o Geoff Collyer-Original author of the OVERVIEW database o Geoff Collyer-Original author of the OVERVIEW database
proposal and one of the original authors of CNEWS proposal and one of the original authors of CNEWS
o Dan Curry-Original author of the xvnews newsreader o Dan Curry-Original author of the xvnews newsreader
o Wayne Davison-Author of the first threading extensions to o Wayne Davison-Author of the first threading extensions to
the RN newsreader (commonly called TRN). the RN newsreader (commonly called TRN).
o Geoff Huston-Original author of ANU NEWS o Geoff Huston-Original author of ANU NEWS
o Phil Lapsey-Original author of the UNIX reference o Phil Lapsey-Original author of the UNIX reference
implementation for NNTP implementation for NNTP
o Iain Lea-Original maintainer of the TIN newsreader o Iain Lea-Original maintainer of the TIN newsreader
o Chris Lewis-First known implementor of the AUTHINFO o Chris Lewis-First known implementor of the AUTHINFO
GENERIC extension GENERIC extension
o Rich Salz-Original author of INN o Rich Salz-Original author of INN
o Henry Spencer-One of the original authors of CNEWS o Henry Spencer-One of the original authors of CNEWS
o Kim Storm-Original author of the NN newsreader o Kim Storm-Original author of the NN newsreader
18.Author's Address 18.Author's Address
Stan Barber Stan Barber
P.O. Box 300481 P.O. Box 300481
Houston, Texas 77230 Houston, Texas 77230
Email: <sob@academ.com> Email: <sob@academ.com>
This document expires May 30, 2001. This document expires June 30, 2001.
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