UHNAMES not working properly on new connection from client #306

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2026-10-05T04:12:00+02:00

adam commented

2026-10-05 04:12:00 +02:00

When I connect with my client (mIRC) to ZNC I see that it outputs the NAMES for each channel in NAMESX-format. However, it does not output in UHNAMES-format eventhough the client supports it (I see it sending it in debug with PROTOCTL, it sends one for NAMESX and a new one for UHNAMES).

Once connected, however, if I /hop a channel or I am already connected while ZNC jumps servers, then I get the correct UHNAMES-formatted NAMES output.

This almost looks like some kind of race condition between the client sending its PROTOCTL capabilities upon initial connection and ZNC already sending its NAMES output to the client.

When I connect with my client (mIRC) to ZNC I see that it outputs the NAMES for each channel in NAMESX-format. However, it does not output in UHNAMES-format eventhough the client supports it (I see it sending it in debug with PROTOCTL, it sends one for NAMESX and a new one for UHNAMES). Once connected, however, if I /hop a channel or I am already connected while ZNC jumps servers, then I get the correct UHNAMES-formatted NAMES output. This almost looks like some kind of race condition between the client sending its PROTOCTL capabilities upon initial connection and ZNC already sending its NAMES output to the client.

adam closed this issue

2026-10-05 04:12:00 +02:00

adam commented

2026-10-05 04:12:01 +02:00

The race is: mIRC sends the PROTOCOL command and at the same time, ZNC already sends the channel joins.

This is why this can be requested with CAP REQ userhost-in-names before login. That way, there is no race.

The race is: mIRC sends the PROTOCOL command and at the same time, ZNC already sends the channel joins. This is why this can be requested with CAP REQ userhost-in-names before login. That way, there is no race.

adam commented

2026-10-05 04:12:02 +02:00

Oh, thanks for the tip, a little pre-logon script is in order here then. But howcome it does send NAMESX-formatted output?

Edit: Nevermind, it seems that mIRC sends a CAP request for multi-prefix.

Oh, thanks for the tip, a little pre-logon script is in order here then. But howcome it does send NAMESX-formatted output? Edit: Nevermind, it seems that mIRC sends a CAP request for multi-prefix.

adam commented

2026-10-05 04:12:03 +02:00

I don't know, perhaps mIRC requests that one per CAP and doesn't to so for userhost-in-names / UHNAMES?

I don't know, perhaps mIRC requests that one per CAP and doesn't to so for userhost-in-names / UHNAMES?

adam commented

2026-10-05 04:12:03 +02:00

Yes, that was exactly it.

Yes, that was exactly it.

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Reference: adam/znc#306