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nntp(n) Tcl NNTP Client Library nntp(n) 





NAME


nntp - Tcl client for the NNTP protocol






SYNOPSIS


package require Tcl 8.2


package require nntp ?0.2.1?


::nntp::nntp ?host? ?port?
  ?nntpName?


nntpName method ?arg arg ...?


nntpName article ?msgid?


nntpName authinfo ?user? ?pass?


nntpName body ?msgid?


nntpName configure


nntpName configure option


nntpName configure option value
  ...


nntpName cget option


nntpName date


nntpName group ?group?


nntpName head ?msgid?


nntpName help


nntpName last


nntpName list


nntpName listgroup ?group?


nntpName mode_reader


nntpName newgroups since


nntpName newnews


nntpName newnews since


nntpName newnews group ?since?


nntpName next


nntpName post article


nntpName slave


nntpName stat ?msgid?


nntpName quit


nntpName xgtitle ?group_pattern?


nntpName xhdr field ?range?


nntpName xover ?range?


nntpName xpat field range
    ?pattern_list?










DESCRIPTION


The package nntp provides a simple Tcl-only client library
    for the NNTP protocol. It works by opening the standard NNTP socket on the
    server, and then providing a Tcl API to access the NNTP protocol commands.
    All server errors are returned as Tcl errors (thrown) which must be caught
    with the Tcl catch command.






COMMANDS



  
::nntp::nntp ?host? ?port? ?nntpName?

  
The command opens a socket connection to the specified NNTP server and
      creates a new nntp object with an associated global Tcl command whose name
      is nntpName. This command may be used to access the various NNTP
      protocol commands for the new connection. The default port number
      is "119" and the default host is "news". These
      defaults can be overridden with the environment variables NNTPPORT
      and NNTPHOST respectively.
    
Some of the commands supported by this package are not part of
        the nntp rfc 977 (http://www.rfc-editor.org/rfc/rfc977.txt) and
        will not be available (or implemented) on all nntp servers.

    
The access command nntpName has the following general
        form:

  







  

  
Option and the args determine the exact behavior of the
      command.







  

  
Query the server for article msgid from the current group. The
      article is returned as a valid tcl list which contains the headers,
      followed by a blank line, and then followed by the body of the article.
      Each element in the list is one line of the article.

  

  
Send authentication information (username and password) to the
    server.

  

  
Query the server for the body of the article msgid from the current
      group. The body of the article is returned as a valid tcl list. Each
      element in the list is one line of the body of the article.

  

  

  

  

  

  

  

  
Query and configure options of the nntp connection object. Currently only
      one option is supported, -binary. When set articles are retrieved
      as binary data instead of text. The only methods affected by this are
      article and body.
    
One application of this option would be the download of
        articles containing yEnc encoded images. Although encoded the data is
        still mostly binary and retrieving it as text will corrupt the
        information.

    
See package yencode for both encoder and decoder of
        such data.

  

  

  
Query the server for the servers current date. The date is returned in the
      format YYYYMMDDHHMMSS.

  

  
Optionally set the current group, and retrieve information about the
      currently selected group. Returns the estimated number of articles in the
      group followed by the number of the first article in the group, followed
      by the last article in the group, followed by the name of the group.

  

  
Query the server for the headers of the article msgid from the
      current group. The headers of the article are returned as a valid tcl
      list. Each element in the list is one line of the headers of the
    article.

  

  
Retrieves a list of the commands that are supported by the news server
      that is currently attached to.

  

  
Sets the current article pointer to point to the previous message (if
      there is one) and returns the msgid of that message.

  

  
Returns a tcl list of valid newsgroups and associated information. Each
      newsgroup is returned as an element in the tcl list with the following
      format:








      group last first p






  

  
where <group> is the name of the newsgroup, <last> is the
      number of the last known article currently in that newsgroup,
      <first> is the number of the first article currently in the
      newsgroup, and <p> is either 'y' or 'n' indicating whether posting
      to this newsgroup is allowed ('y') or prohibited ('n').
    
The <first> and <last> fields will always be
        numeric. They may have leading zeros. If the <last> field
        evaluates to less than the <first> field, there are no articles
        currently on file in the newsgroup.

  





  

  
Query the server for a list of all the messages (message numbers) in the
      group specified by the argument group or by the current group if
      the group argument was not passed.

  

  
Query the server for its nntp 'MODE READER' response string.

  

  
Query the server for a list of all the new newsgroups created since the
      time specified by the argument since. The argument since can
      be any time string that is understood by clock scan. The tcl list
      of newsgroups is returned in a similar form to the list of groups returned
      by the nntpName list command. Each element of the list has the
      form:








      group last first p






  

  
where <group> is the name of the newsgroup, <last> is the
      number of the last known article currently in that newsgroup,
      <first> is the number of the first article currently in the
      newsgroup, and <p> is either 'y' or 'n' indicating whether posting
      to this newsgroup is allowed ('y') or prohibited ('n').





  

  
Query the server for a list of new articles posted to the current group in
      the last day.

  

  
Query the server for a list of new articles posted to the current group
      since the time specified by the argument since. The argument
      since can be any time string that is understood by clock
      scan.

  

  
Query the server for a list of new articles posted to the group specified
      by the argument group since the time specified by the argument
      since (or in the past day if no since argument is passed.
      The argument since can be any time string that is understood by
      clock scan.

  

  
Sets the current article pointer to point to the next message (if there is
      one) and returns the msgid of that message.

  

  
Posts an article of the form specified in RFC 1036
      (http://www.rfc-editor.org/rfc/rfc1036.txt, successor to RFC 850)
      to the current news group.

  

  
Identifies a connection as being made from a slave nntp server. This might
      be used to indicate that the connection is serving multiple people and
      should be given priority. Actual use is entirely implementation dependent
      and may vary from server to server.

  

  
The stat command is similar to the article command except that no text is
      returned. When selecting by message number within a group, the stat
      command serves to set the current article pointer without sending text.
      The returned acknowledgment response will contain the message-id, which
      may be of some value. Using the stat 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"

  

  
Gracefully close the connection after sending a NNTP QUIT command down the
      socket.

  

  
Returns a tcl list where each element is of the form:






newsgroup description






  

  
If a group_pattern is specified then only newsgroups that match the
      pattern will have their name and description returned.





  

  
Returns the specified header field value for the current message or for a
      list of messages from the current group. field is the title of a
      field in the header such as from, subject, date, etc. If range is
      not specified or is "" then the current message is queried. The
      command returns a list of elements where each element has the form
    of:








    msgid value






  

  
Where msgid is the number of the message and value is the value set for
      the queried field. The range argument can be in any of the
      following forms:







  
""

  
The current message is queried.

  

  
All messages between msgid1 and msgid2 (including
      msgid1 and msgid2) are queried.

  

  
All messages between msgid1 and msgid2 (including
      msgid1 and msgid2) are queried.







  

  
Returns header information for the current message or for a range of
      messages from the current group. The information is returned in a tcl list
      where each element is of the form:








    msgid subject from date idstring bodysize headersize xref






  

  
If range is not specified or is "" then the current
      message is queried. The range argument can be in any of the
      following forms:







  
""

  
The current message is queried.

  

  
All messages between msgid1 and msgid2 (including
      msgid1 and msgid2) are queried.

  

  
All messages between msgid1 and msgid2 (including
      msgid1 and msgid2) are queried.







  

  
Returns the specified header field value for a specified message or for a
      list of messages from the current group where the messages match the
      pattern(s) given in the pattern_list. field is the title of a field
      in the header such as from, subject, date, etc. The information is
      returned in a tcl list where each element is of the form:








    msgid value






  

  
Where msgid is the number of the message and value is the value set for
      the queried field. The range argument can be in any of the
      following forms:







  

  
The message specified by msgid is queried.

  

  
All messages between msgid1 and msgid2 (including
      msgid1 and msgid2) are queried.

  

  
All messages between msgid1 and msgid2 (including
      msgid1 and msgid2) are queried.










EXAMPLE


A bigger example for posting a single article.








    package require nntp


    set n [nntp::nntp NNTP_SERVER]


    $n post "From: USER@DOMAIN.EXT (USER_FULL)


    Path: COMPUTERNAME!USERNAME


    Newsgroups: alt.test


    Subject: Tcl test post -ignore


    Message-ID: <[pid][clock seconds]


    @COMPUTERNAME>


    Date: [clock format [clock seconds] -format "%a, %d %


    b %y %H:%M:%S GMT" -gmt true]


    Test message body"









BUGS, IDEAS, FEEDBACK


This document, and the package it describes, will undoubtedly
    contain bugs and other problems. Please report such in the category
    nntp of the Tcllib Trackers
    [http://core.tcl.tk/tcllib/reportlist]. Please also report any ideas for
    enhancements you may have for either package and/or documentation.


When proposing code changes, please provide unified diffs,
    i.e the output of diff -u.


Note further that attachments are strongly preferred over
    inlined patches. Attachments can be made by going to the Edit form of
    the ticket immediately after its creation, and then using the left-most
    button in the secondary navigation bar.






KEYWORDS


news, nntp, nntpclient, rfc 1036, rfc 977






CATEGORY


Networking







  

    1.5.1
    tcllib