From 924141683c866cce33fa43cef2534fa3ccf98401 Mon Sep 17 00:00:00 2001
From: reverse <mike.chevronnet@gmail.com>
Date: Wed, 19 Aug 2026 01:18:27 +0000
Subject: [PATCH] =?UTF-8?q?extbanbanlist:=20identify=20extbans=20by=20the?=
 =?UTF-8?q?=20real=20rule=20(<letter>:...)=20instead=20of=20"2nd=20byte=20?=
 =?UTF-8?q?is=20a=20colon"=20=E2=80=94=20the=20old=20heuristic=20wrongly?=
 =?UTF-8?q?=20skipped=20a=20plain=20hostmask=20whose=20second=20char=20hap?=
 =?UTF-8?q?pened=20to=20be=20':',=20mis-listing=20it?=
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Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/modules/extbanbanlist.rs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/modules/extbanbanlist.rs b/src/modules/extbanbanlist.rs
index 35efc3a..30314cf 100644
--- a/src/modules/extbanbanlist.rs
+++ b/src/modules/extbanbanlist.rs
@@ -10,9 +10,11 @@ use crate::channels::glob_match;
 use crate::server::Server;
 use crate::Uid;
 
-/// A plain host-mask ban entry (not itself an extban).
+/// A plain host-mask ban entry (not itself an extban). An extban is `<letter>:…`,
+/// matching `normalize_ban_mask`'s rule — anything else is a plain host-mask.
 fn is_plain(mask: &str) -> bool {
-    mask.as_bytes().get(1) != Some(&b':')
+    let b = mask.as_bytes();
+    !(b.len() >= 2 && b[0].is_ascii_alphabetic() && b[1] == b':')
 }
 
 /// True if `uid` is on `chan`'s (plain) ban list with no matching plain exception.