* lib/net/imap.rb (initialize): raise Net::IMAP::Error when the

connection is closed without a greeting response.
  [ruby-core:40938] [Bug #5616]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35055 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Fri Mar 16 14:10:45 2012  Shugo Maeda  <shugo@ruby-lang.org>
+
+	* lib/net/imap.rb (initialize): raise Net::IMAP::Error when the
+	  connection is closed without a greeting response.
+	  [ruby-core:40938] [Bug #5616]
+
 Fri Mar 16 13:50:12 2012  Shugo Maeda  <shugo@ruby-lang.org>
 
 	* lib/net/imap.rb (rfc822_text): ignore [] after RFC822.

lib/net/imap.rb

@@ -1065,6 +1065,10 @@ module Net
       @exception = nil
 
       @greeting = get_response
+      if @greeting.nil?
+        @sock.close
+        raise Error, "connection closed"
+      end
       if @greeting.name == "BYE"
         @sock.close
         raise ByeResponseError, @greeting

test/net/imap/test_imap.rb

@@ -418,6 +418,25 @@ class IMAPTest < Test::Unit::TestCase
     end
   end
 
+  def test_connection_closed_without_greeting
+    server = create_tcp_server
+    port = server.addr[1]
+    Thread.start do
+      begin
+        sock = server.accept
+        sock.close
+      rescue
+      end
+    end
+    begin
+      assert_raise(Net::IMAP::Error) do
+        Net::IMAP.new(SERVER_ADDR, :port => port)
+      end
+    ensure
+      server.close
+    end
+  end
+
   def test_default_port
     assert_equal(143, Net::IMAP.default_port)
     assert_equal(143, Net::IMAP.default_imap_port)