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- From: admin@mudconnect.com (Andrew Cowan)
- Newsgroups: rec.games.mud.announce,rec.games.mud.misc,rec.answers,news.answers
- Subject: [rec.games.mud]: FAQ #3/4: RWHO and "mudwho"
- Approved: news-answers-request@MIT.Edu,rgm-announce-request@pennmush.org
- Followup-To: rec.games.mud.misc
- Date: Mon, 17 Sep 2001 00:25:26 -0000
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- Reply-To: admin@mudconnect.com
- Summary: info on rwho servers, and mudwho
- Keywords: muds rwho mwhod mudwho
- Archive-name: games/mud-faq/part3
- URL: http://www.mudconnect.com/mudfaq/index.html
- Posting-Frequency: bi-monthly
- Expires: 1 Oct 2001 03:16:47 EDT
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-
- FREQUENTLY ASKED QUESTIONS: Basic Information on RWHO and mudwho
-
- This is part 3 in a 4 part series of FAQs.
-
- Disclaimer: This document may be seen to be biased towards
- TinyMUDs. This is because the original author of this document
- mainly plays those types of servers, not because she thinks they
- are inherently better or worse than other types of servers.
- However, this document is meant to be generalized and useful for
- all MUDdom, and so corrections and contributions are always
- welcome. The new maintainers will be gradually modifying the FAQ to
- be geared towards all of the various server types.
-
- Note: This section of the MUD FAQ is not currently being
- maintained. The two links included in section 3.3 are now obsolete
- and I was unable to find alternative locations. If anyone knows
- where to find new locations please email the FAQ maintainer and I
- will update this document accordingly.
-
- Table of Contents
-
- * 3.1. What is RWHO?
- * 3.2. How Does It All Work?
- * 3.3. Where Can I Get This Stuff?
- * 3.4. Where Are Some RWHO Servers?
-
- RWHO and mudwho
-
- 3.1. What is RWHO?
-
- RWHO stands for Remote WHO. It's a way of getting a WHO list from a
- MUD, without even having to connect to that MUD at all. Anyone can get
- this output from a RWHO server (an mwhod), by using straight telnet to
- connect to a certain port (6889), or by using the client program
- mudwho. RWHO servers talk to other mwhods, passing information
- around, and are talked to directly by some MUDs, receiving information
- from them.
-
- Any one mwhod keeps track of several MUDs, plus storing information
- passed it from other mwhods. Only MUDs that have the RWHO routines
- compiled in will be able to send their WHO list info to a mwhod.
- UnterMUDs have this capability built in; other MUDs have to have the
- routines installed first. The RWHO routines have been installed into
- TinyMUSH, TinyMUCK, LPMUD, DikuMUD, and AberMUD, as well as the
- Nightmare 2.5, TMI2, and Lima mudlibs for LPMUD without encountering
- any difficulty.
-
- 3.2. How Does It All Work?
-
- mwhod is the RWHO server that runs on a particular host and keeps a
- list of known MUDs. It is initially primed with a list of "trusted"
- MUDs and passwords used for authentication, and will accept
- information about who is logged into those MUDs. The server also has a
- notion of a "peer" server, which can transfer it (occasionally) a copy
- of all of its list of who is logged on, and where. The idea is that
- the whole MUDding community could probably be served pretty well by
- about 5 peer mwhods that kept each other up to date about what each
- one is seeing.
-
- Communication between mwhods (and server updates sent to mwhods) is
- done with UDP datagrams, since they're fast, nonblocking, and
- throw-away. (RWHO information is considered to be interesting but not
- vital information, if you get my drift). Each MUD server only sends
- updates to a single mwhod, which may then propagate that information
- to its peers. This is done within the MUD server as follows:
- * whenever the server boots, it sends a "hi there" packet to the
- mwhod, telling it that it's up and running.
- * whenever a player connects, it sends a "so and so is here" packet
- to the mwhod, telling it that the user has connected.
- * whenever a player disconnects, it sends a "so and so left" packet
- to the mwhod, telling it to delete the entry.
- * every so often ("so often" being defined as a time agreed upon by
- the mwhod's owner, and the MUD's wizard, usually every 5 minutes
- or so) the MUD sends a "hi there" packet and a complete list of
- everyone that is on, just to refresh the mwhod's idea of who is
- logged into that MUD.
-
- If a user connects to a specific port (6889) of a host machine running
- an mwhod they are given a formatted dump of the mwhod's current table
- of MUDs and players, and then disconnected. mudwho is a simple little
- program that contacts an mwhod and downloads this information.
- Ideally, the functionality of mudwho would be built into a player's
- client software, for ease of use. Two handy options can be used by
- mudwho, if the netlag to the mwhod server isn't too bad. The options
- are -u <username>, and -m <mudname>. If received before the timeout,
- the mwhod will then only dump WHO list information for the specified
- player or MUD.
-
- The mwhod does some clever stuff as far as eventually timing
- information about of its tables - for example, if it hears absolutely
- nothing from a MUD for a certain amount of time, it will mark the MUD
- as down. Player entries are expired similarly. The design is based on
- the idea that we'll use UDP to just fling information out and hope it
- sticks, and then let the recipient clean it up, rather than to develop
- a more complex protocol based on TCPs and timeouts. To prevent a
- packet circular send situation, each entry that is sent is given a
- "generation" number, which is incremented by one each time it is
- forwarded along. In this manner, a MUD server might send a "so and so
- is here" (generation zero) to its local mwhod. The local mwhod will
- eventually send a copy to any peers it may have (generation one), and
- so forth. Part of the initial table that an mwhod uses to establish
- what peers it trusts contains a generation value, and it will neither
- accept nor propagate information to a specific peer that is of a
- higher generation value. This way, a "tree" of servers could
- theoretically be constructed, with the highest level one having a
- total view of a large MudIverse.
-
- 3.3. Where Can I Get This Stuff?
-
- The RWHO routines can be ftp'd from decuac.dec.com, in pub/mud.
- Included is a HOW_TO file, which describes how to plug the routines
- into a MUD server, and also where to ask for a mwhod to use.
-
- The mwhod program itself can also be found on decuac, but there is
- currently little need for another one running in the USA, except
- perhaps as a backup. There is, however, only one running in all of
- Europe, and further expansion may need to be made in that area.
-
- 3.4. Where Are Some RWHO Servers?
-
- Updated 12/28/99 - we have been informed that the only known RWHO
- server is no longer running. So, the only answer we can provide is
- that we do not know. If you have any information about RWHO servers
- that are still running please email us at admin@mudconnect.com.
- _________________________________________________________________
-
- This posting has been generated as a public service, but is still
- copyrighted 1996-1999 by Jennifer Smith. Modifications made after
- August, 1999 are copyrighted 1999 by Andrew Cowan. If you have any
- suggestions, questions, additions, comments or criticisms
- concerning this posting, contact Andrew Cowan
- (admin@mudconnect.com). Other Frequently Asked Questions (FAQ)
- postings contain information dealing with clients, servers, RWHO,
- and FTP sites. While these items aren't necessary, they are quite
- useful. I'd also like to thank cthonics (felixg@coop.com) for his
- help in writing these FAQs, ashne and Satoria for their help, and
- everyone else for helpful comments and suggestions. Thanks again to
- Alec Muffett (aem@aberystwyth.ac.uk) of alt.security.
-
- The most recent versions of these FAQs are archived at
- http://www.mudconnect.com/mudfaq/ and on rtfm.mit.edu in the
- news.answers archives.
- _________________________________________________________________
-
- Andrew Cowan / admin@mudconnect.com
-