https://git.ruby-lang.org/ruby.git/commit/?id=d14397bcc4

From d14397bcc48b73070953c9fbd410ba435e5f4b8c Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Mon, 9 Nov 2020 16:16:30 +0900
Subject: `fe80` should be case insensitive too


diff --git a/lib/resolv.rb b/lib/resolv.rb
index dd0a959..3ca0f01 100644
--- a/lib/resolv.rb
+++ b/lib/resolv.rb
@@ -2462,7 +2462,7 @@ class Resolv https://github.com/ruby/ruby/blob/trunk/lib/resolv.rb#L2462
     ##
     # IPv6 link local address format fe80:b:c:d:e:f:g:h%em1
     Regex_8HexLinkLocal = /\A
-      fe80
+      [Ff][Ee]80
       (?::[0-9A-Fa-f]{1,4}){7}
       %[0-9A-Za-z]+
       \z/x
@@ -2471,7 +2471,7 @@ class Resolv https://github.com/ruby/ruby/blob/trunk/lib/resolv.rb#L2471
     # Compressed IPv6 link local address format fe80::b%em1
 
     Regex_CompressedHexLinkLocal = /\A
-      fe80:
+      [Ff][Ee]80:
       (?:
         ((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?) ::
         ((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)
diff --git a/test/resolv/test_addr.rb b/test/resolv/test_addr.rb
index e72d4ee..6209267 100644
--- a/test/resolv/test_addr.rb
+++ b/test/resolv/test_addr.rb
@@ -25,6 +25,9 @@ class TestResolvAddr < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/resolv/test_addr.rb#L25
     assert_match(Resolv::IPv6::Regex, "fe80:2:3:4:5:6:7:8%em1", bug17112)
     assert_match(Resolv::IPv6::Regex, "fe80::20d:3aff:fe7d:9760%eth0", bug17112)
     assert_match(Resolv::IPv6::Regex, "fe80::1%em1", bug17112)
+    assert_match(Resolv::IPv6::Regex, "FE80:2:3:4:5:6:7:8%EM1", bug17112)
+    assert_match(Resolv::IPv6::Regex, "FE80::20D:3AFF:FE7D:9760%ETH0", bug17112)
+    assert_match(Resolv::IPv6::Regex, "FE80::1%EM1", bug17112)
   end
 
   def test_valid_socket_ip_address_list
-- 
cgit v0.10.2


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