June 2002
Beginner
759 pages
80h 42m
English
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The NNTP Protocol
Before you write your own news client, you should have some idea of how the NNTP protocol works. Like other servers, an NNTP server is bound to a port (usually port 119). It listens for incoming connections, takes the appropriate action, and returns a response to the client. When a news client connects with an NNTP server, or to the port on which the NNTP server is running, a message such as the following is produced:
Trying 0.0.0.0... Connected to hostname.mydomain.com. Escape character is '^]'. 200 newshost.mydomain.com InterNetNews NNRP server INN 1.5.1 17-Dec-1996 ready (posting ok).
Many NNTP servers understand the help (or HELP) command. When a client issues a help command, many NNTP servers respond with a list of all available commands. For example:
200 news.mydomain.com InterNetNews NNRP server INN 1.5.1 17-Dec-1996 ready (posting ok). HELP 100 Legal commands authinfo user Name|pass Password|generic <prog> <args> article [MessageID|Number] body [MessageID|Number] date group newsgroup head [MessageID|Number] help ihave last list [active|active.times|newsgroups|distributions|distrib.pats| overview.fmt|subscriptions] listgroup newsgroup mode reader newgroups yymmdd hhmmss ["GMT"] [<distributions>] newnews newsgroups yymmdd hhmmss ["GMT"] [<distributions>] next post slave stat [MessageID|Number] xgtitle [group_pattern] xhdr header [range|MessageID] xover [range] xpat header range|MessageID pat [morepat...] xpath MessageID Report problems to <usenet@news.mydomain.com> ...
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