Net::NNTP - NNTP Client class |
Net::NNTP - NNTP Client class
use Net::NNTP;
$nntp = Net::NNTP->new("some.host.name"); $nntp->quit;
Net::NNTP
is a class implementing a simple NNTP client in Perl as described
in RFC977. Net::NNTP
inherits its communication methods from Net::Cmd
HOST
is the
name of the remote host to which a NNTP connection is required. If not
given two environment variables are checked, first NNTPSERVER
then
NEWSHOST
, then Net::Config
is checked, and if a host is not found
then news
is used.
OPTIONS
are passed in a hash like fashion, using key and value pairs.
Possible options are:
Timeout - Maximum time, in seconds, to wait for a response from the NNTP server, a value of zero will cause all IO operations to block. (default: 120)
Debug - Enable the printing of debugging information to STDERR
Reader - If the remote server is INN then initially the connection
will be to nnrpd, by default Net::NNTP
will issue a MODE READER
command
so that the remote server becomes innd. If the Reader
option is given
with a value of zero, then this command will not be sent and the
connection will be left talking to nnrpd.
Unless otherwise stated all methods return either a true or false value, with true meaning that the operation was a success. When a method states that it returns a value, failure will be returned as undef or an empty list.
If FH
is specified then it is expected to be a valid filehandle
and the result will be printed to it, on sucess a true value will be
returned. If FH
is not specified then the return value, on sucess,
will be a reference to an array containg the article requested, each
entry in the array will contain one line of the article.
If no arguments are passed then the current article in the currently selected newsgroup is fetched.
MSGNUM
is a numeric id of an article in the current newsgroup, and
will change the current article pointer. MSGID
is the message id of
an article as shown in that article's header. It is anticipated that the
client will obtain the MSGID
from a list provided by the newnews
command, from references contained within another article, or from the
message-id provided in the response to some other commands.
If there is an error then undef
will be returned.
article
but only fetches the body of the article.
article
but only fetches the headers for the article.
body()
and head(), but rather than
returning the requested data directly, they return a tied filehandle
from which to read the article.
nntpstat
command is similar to the article
command except that no
text is returned. When selecting by message number within a group,
the nntpstat
command serves to set the ``current article pointer'' without
sending text.
Using the nntpstat
command to
select by message-id is valid but of questionable value, since a
selection by message-id does not alter the ``current article pointer''.
Returns the message-id of the ``current article''.
GROUP
is not given then information
is returned on the current group.
In a scalar context it returns the group name.
In an array context the return value is a list containing, the number of articles in the group, the number of the first article, the number of the last article and the group name.
ihave
command informs the server that the client has an article
whose id is MSGID
. If the server desires a copy of that
article, and MESSAGE
has been given the it will be sent.
Returns true if the server desires the article and MESSAGE
was
successfully sent,if specified.
If MESSAGE
is not specified then the message must be sent using the
datasend
and dataend
methods from the Net::Cmd manpage
MESSAGE
can be either an array of lines or a reference to an array.
Returns the message-id of the article.
postok
will return true if the servers initial response indicated
that it will allow posting.
SINCE
is a time value and DISTRIBUTIONS
is either a distribution
pattern or a reference to a list of distribution patterns.
The result is the same as list
, but the
groups return will be limited to those created after SINCE
and, if
specified, in one of the distribution areas in DISTRIBUTIONS
.
SINCE
is a time value. GROUPS
is either a group pattern or a reference
to a list of group patterns. DISTRIBUTIONS
is either a distribution
pattern or a reference to a list of distribution patterns.
Returns a reference to a list which contains the message-ids of all news posted
after SINCE
, that are in a groups which matched GROUPS
and a
distribution which matches DISTRIBUTIONS
.
Returns the message-id of the article.
MESSAGE
is specified and posting
is allowed then the message will be sent.
If MESSAGE
is not specified then the message must be sent using the
datasend
and dataend
methods from the Net::Cmd manpage
MESSAGE
can be either an array of lines or a reference to an array.
print()
the contents of the article to be posted. You must
explicitly close()
the filehandle when you are finished posting the
article, and the return value from the close()
call will indicate
whether the message was successfully posted.
These methods use commands that are not part of the RFC977 documentation. Some servers may not support all of them.
PATTERN
, or all of the groups if no pattern is specified, and
each value contains the description text for the group.
xover
.
list
but only active groups that match the pattern are returned.
PATTERN
can be a group pattern.
PATTERN
and each value is the description text for the group.
HEADER
for all the messages specified.
The return value will be a reference to a hash where the keys are the message numbers and each value contains the text of the requested header for that message.
The names of the fields can be obtained by calling overview_fmt
.
xhdr
except the is will be restricted to
headers where the text of the header matches PATTERN
article(s)
specified.
Returns a reference to a HASH where the keys are the message numbers and the values are the References: lines from the articles
GROUP
, or
the current group if GROUP
is not specified.
This is required by some servers. For example if you are connecting to an INN server and you have transfer permission your connection will be connected to the transfer daemon, not the NNTP daemon. Issuing this command will cause the transfer daemon to hand over control to the NNTP daemon.
Some servers do not understand this command, but issuing it and ignoring the response is harmless.
The following NNTP command are unsupported by the package, and there are no plans to do so.
AUTHINFO GENERIC XTHREAD XSEARCH XINDEX
MESSAGE-SPEC
is either a single message-id, a single message number, or
a reference to a list of two message numbers.
If MESSAGE-SPEC
is a reference to a list of two message numbers and the
second number in a range is less than or equal to the first then the range
represents all messages in the group after the first message number.
NOTE For compatibility reasons only with earlier versions of Net::NNTP a message spec can be passed as a list of two numbers, this is deprecated and a reference to the list should now be passed
NNTP
protocol uses the WILDMAT
format for patterns.
The WILDMAT format was first developed by Rich Salz based on
the format used in the UNIX ``find'' command to articulate
file names. It was developed to provide a uniform mechanism
for matching patterns in the same manner that the UNIX shell
matches filenames.
Patterns are implicitly anchored at the beginning and end of each string when testing for a match.
There are five pattern matching operations other than a strict one-to-one match between the pattern and the source to be checked for a match.
The first is an asterisk *
to match any sequence of zero or more
characters.
The second is a question mark ?
to match any single character. The
third specifies a specific set of characters.
The set is specified as a list of characters, or as a range of characters
where the beginning and end of the range are separated by a minus (or dash)
character, or as any combination of lists and ranges. The dash can
also be included in the set as a character it if is the beginning
or end of the set. This set is enclosed in square brackets. The
close square bracket ]
may be used in a set if it is the first
character in the set.
The fourth operation is the same as the
logical not of the third operation and is specified the same
way as the third with the addition of a caret character ^
at
the beginning of the test string just inside the open square
bracket.
The final operation uses the backslash character to
invalidate the special meaning of an open square bracket [
,
the asterisk, backslash or the question mark. Two backslashes in
sequence will result in the evaluation of the backslash as a
character with no special meaning.
[^]-]
[0-9a-zA-Z]
a??d
Graham Barr <gbarr@pobox.com>
Copyright (c) 1995-1997 Graham Barr. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
$Id: //depot/libnet/Net/NNTP.pm#15 $
Net::NNTP - NNTP Client class |