Книга: Linux Network Administrator Guide, Second Edition

Pushing a News Article onto a Server

Pushing a News Article onto a Server

We mentioned the IHAVE command when we talked about pushing news articles onto a news server. Let's now have a look at how the IHAVE command actually works:

ihave ‹[email protected]›
335
From: [email protected]
Subject: test message sent with ihave
Newsgroups: junk
Distribution: world
Path: gw.vk2ktj.ampr.org
Date: 26 April 1999
Message-ID: ‹[email protected]›
Body:
This is a test message sent using the NNTP IHAVE command.
.
235

All NNTP commands are case insensitive, so you may enter them in either upper- or lowercase. The IHAVE command takes one mandatory argument, it being the Message ID of the article that is being pushed. Every news article is assigned a unique message ID when it is created. The IHAVE command provides a way of the NNTP server to say which articles it has when it wants to push articles to another server. The sending server will issue an IHAVE command for each article it wishes to push. If the command response code generated by the receiving NNTP server is in the "3xx" range, the sending NNTP server will transmit the complete article, including it's full header, terminating the article with a period on a line by itself. If the response code was in the "4xx" range, the receiving server has chosen not to accept this article, possibly because it already has it, or because of some problem, such as running out of disk space.

When the article has been transmitted, the receiving serve issues another response code indicating whether the article transmission was successful.

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