# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1744206894 -7200
# Node ID 61df1404dd7af9897b0bd531f4aee944b397375f
# Parent  497efa2cbf2c29b6d0f5c12e848d6dde094ba72e
mod_http: Fix IP address normalization (Thanks Boris)

This fixes the problem that an un-bracketed IPv6 address will not match
the first pattern (since it matches brackets) and instead the first
decimal digits will match the pattern meant to strip port numbers from
IPv4 addresses, e.g. 2001:db8::1 --> 2000

This pattern instead matches enough of a regular IPv4 address to make an
IPv6 address fall back to the last case.

diff -r 497efa2cbf2c -r 61df1404dd7a plugins/mod_http.lua
--- a/plugins/mod_http.lua	Wed Apr 09 15:06:48 2025 +0200
+++ b/plugins/mod_http.lua	Wed Apr 09 15:54:54 2025 +0200
@@ -331,7 +331,7 @@
 
 --- deal with [ipv6]:port / ip:port format
 local function normal_ip(ip)
-	return ip:match("^%[([%x:]*)%]") or ip:match("^([%d.]+)") or ip;
+	return ip:match("^%[([%x:]*)%]") or ip:match("^%d+%.%d+%.%d+%.%d+") or ip;
 end
 
 local function is_trusted_proxy(ip)