* lib/resolv.rb (Resolv::DNS::Requester#request): rescue ECONNREFUSED.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@28058 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Sat May 29 09:04:06 2010  Tanaka Akira  <akr@fsij.org>
+
+	* lib/resolv.rb (Resolv::DNS::Requester#request): rescue ECONNREFUSED.
+
 Sat May 29 08:46:29 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* gc.c (allocate_sorted_heaps, before_gc_sweep, gc_sweep): removed

lib/resolv.rb

@@ -638,7 +638,13 @@ class Resolv
           if !select_result
             raise ResolvTimeout
           end
-          reply, from = recv_reply(select_result[0])
+          begin
+            reply, from = recv_reply(select_result[0])
+          rescue Errno::ECONNREFUSED
+            # No name server running on the server?
+            # Don't wait anymore.
+            raise ResolvTimeout
+          end
           begin
             msg = Message.decode(reply)
           rescue DecodeError

test/resolv/test_dns.rb

@@ -104,4 +104,18 @@ class TestResolvDNS < Test::Unit::TestCase
       end
     }
   end
+
+  def test_no_server
+    u = UDPSocket.new
+    u.bind("127.0.0.1", 0)
+    _, port, _, host = u.addr
+    u.close
+    # A rase condition here.
+    # Another program may use the port.
+    # But no way to prevent it.
+    Resolv::DNS.open(:nameserver_port => [[host, port]]) {|dns|
+      assert_equal([], dns.getresources("test-no-server.example.org", Resolv::DNS::Resource::IN::A))
+    }
+  end
+
 end