46 lines
1.8 KiB
Plaintext
46 lines
1.8 KiB
Plaintext
Nick collision FNC
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Jilles Tjoelker <jilles -at- stack.nl>
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Nick collision FNC performs a forced nick change to the user's UID instead
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of a kill. The criteria for which user may keep the nick are the same as
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before. Server notices will say the clients are being "saved" instead of
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"killed". The client will get a 043 numeric, like this:
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:<server> 043 <nick> <uid> :Nick collision, forcing nick change to your unique ID
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The following conditions must be fulfilled:
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- All servers on the network must allow remote nicks starting with a digit.
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This is not checked; if this is not fulfilled, users will be killed right
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after being FNCed.
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- All servers on the path between the two clients must support TS6 and
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nick collision FNC (SAVE capab). If this is not fulfilled, the collision is
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resolved with kills as before. (This uses the ENCAP GCAP data for remotes.)
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- The general::collision_fnc option must be enabled on the server(s) that
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detect the collision.
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Technical details:
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The following message is used to propagate the nick change coming from the
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server that detected the collision:
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:<sid> SAVE <uid> <ts>
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The TS is compared to the current nick TS for the user; if it is not equal,
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the message is dropped. This prevents nick desyncs if the user changed their
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nick after being collided. A SAVE message also generates a server notice to
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+k.
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The SAVE message is used for propagation to the target's server, and also
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in several other cases if the destination supports SAVE. In other cases, a
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normal nick change or introduction with the UID as nick is sent.
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The TS of the UID nick is 100. This is necessary to ensure nick TS is always
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the same on all servers for each nick-user pair, also if a user with a UID
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nick changes their nick but is collided again (the server detecting the
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collision will not propagate the nick change further).
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