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- From: jds@math.okstate.edu (Jennifer "Moira" Smith)
- Subject: [rec.games.mud]: FAQ #3/3: RWHO and "mudwho"
- Message-ID: <faq_rwho_766476003@math.okstate.edu>
- Followup-To: rec.games.mud.misc
- Summary: info on rwho servers, and mudwho
- Keywords: muds rwho mwhod mudwho
- Lines: 135
- Sender: jds@math.okstate.edu (Jennifer Smith)
- Supersedes: <faq_rwho_765183605@math.okstate.edu>
- Reply-To: jds@math.okstate.edu
- Organization: Oklahoma State University, Math Department
- References: <faq_muds_766476003@math.okstate.edu>
- Date: Sat, 16 Apr 1994 06:00:44 GMT
- Approved: news-answers-request@MIT.Edu,rgm-announce-request@glia.biostr.washington.edu
- Expires: Fri, 13 May 1994 06:00:03 GMT
- Xref: bloom-beacon.mit.edu rec.games.mud.announce:818 rec.games.mud.misc:7342 news.answers:18117 rec.answers:4917
-
- Archive-name: games/mud-faq/part3
- Version: $Id: faq.rwho,v 3.1 1994/03/14 05:19:56 jds Exp $
-
- FREQUENTLY ASKED QUESTIONS: Basic Information on RWHO and "mudwho"
-
- This is part 3 in a 3 part series of FAQs.
-
-
- Table of Contents
- -----------------
- 1. What is RWHO?
- 2. How Does It All Work?
- 3. Where Can I Get This Stuff?
- 4. Where Are Some RWHO Servers?
-
-
-
- 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, without encountering any difficulty.
-
- 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. Where Can I Get This Stuff?
-
- The client program "mudwho" can be ftp'd from ftp.math.okstate.edu
- (139.78.10.6), in pub/muds/clients. The shar file contains both
- mudwho.c and a README file, listing a few mwhod sites. The plain "mudwho.c"
- file can be found at decuac.dec.com (192.5.214.1).
-
- The RWHO routines can be ftp'd from decuac.dec.com (192.5.214.1),
- 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. There is, however,
- only one running in Europe, and further expansion may need to be made in
- that area.
-
- 4. Where Are Some RWHO Servers?
-
- Currently, all of these servers talk to each other, so what one knows,
- the rest will know, with the exception of the mwhod in Germany, which only
- talks to the mwhod on riemann.math.okstate.edu (so only riemann has
- the RWHO information from Europe currently). At any one time, there's an
- average of 20 muds, of various types, talking to mwhods.
-
- Site IP Port Admin
- ------------------------------------------------------------------------------
- riemann.math.okstate.edu 139.78.1.15 6889 jds@math.okstate.edu
- amber.ecst.csuchico.edu 132.241.1.43 6889 warlock@ecst.csuchico.edu
- nova.tat.physik
- .uni-tuebingen.de 134.2.62.161 6889 gamesmgr@taurus.tat.physik
- .uni-tuebingen.de
-
- ------------------------------------------------------------------------------
- This posting has been generated as a public service. If you have any
- suggestions, questions, additions, comments or criticisms concerning this
- posting, contact Jennifer Smith, aka Moira (jds@math.okstate.edu).
- Other Frequently Asked Questions (FAQ) postings contain information
- dealing with MUDs, MUDding, clients, servers, and FTP sites. While these
- items aren't necessary, they are quite useful. I'd also like to thank
- Marcus J Ranum (mjr@decuac.dec.com) for writing such a wonderful program
- (and decent docs), and everyone else for helpful comments and suggestions.
-
- The most recent versions of these FAQs are archived on ftp.math.okstate.edu
- (139.78.10.6) in pub/muds/misc/mud-faq, plus on rtfm.mit.edu(18.170.0.226)
- in the news.answers archives. Have fun! - Moira
- --
- Jennifer Smith
- jds@math.okstate.edu
- On MUDs: Moira, Jasra, etc. | But still I fear and still
- Here, have a clue. Take two, they're small. | I dare not Laugh at the Madman.
-