From 9cc2d99c022b43f112cf7ddbcc0d80395c420c94 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 31 Jan 2009 13:40:05 +0000
Subject: * lib/resolv.rb (Resolv::DNS#each_address): don't query IPv6 address 
  if the host has no global IPv6 address.

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@21921 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog     |  5 +++++
 lib/resolv.rb | 14 +++++++++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index b41214389..8a5fd6f21 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Jan 31 22:38:46 2009  Tanaka Akira  <akr@fsij.org>
+
+	* lib/resolv.rb (Resolv::DNS#each_address): don't query IPv6 address
+	  if the host has no global IPv6 address.
+
 Sat Jan 31 22:29:05 2009  Tanaka Akira  <akr@fsij.org>
 
 	* include/ruby/ruby.h (STR2CSTR): removed.
diff --git a/lib/resolv.rb b/lib/resolv.rb
index fc3c78215..ab10a79d7 100644
--- a/lib/resolv.rb
+++ b/lib/resolv.rb
@@ -379,8 +379,20 @@ class Resolv
 
     def each_address(name)
       each_resource(name, Resource::IN::A) {|resource| yield resource.address}
-      each_resource(name, Resource::IN::AAAA) {|resource| yield resource.address}
+      if use_ipv6?
+        each_resource(name, Resource::IN::AAAA) {|resource| yield resource.address}
+      end
+    end
+
+    def use_ipv6?
+      begin
+        list = Socket.ip_address_list
+      rescue NotImplementedError
+        return true
+      end
+      list.any? {|a| a.ipv6? && !a.ipv6_loopback? && !a.ipv6_linklocal? }
     end
+    private :use_ipv6?
 
     ##
     # Gets the hostname for +address+ from the DNS resolver.
-- 
cgit