net/ftp: support timeout for TLS handshake.

Net::FTP inherits ssl_socket_connect from Net::Protocol to implement timeout.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56898 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/net/ftp.rb

@@ -77,7 +77,7 @@ module Net
   # - #rename
   # - #delete
   #
-  class FTP
+  class FTP < Protocol
     include MonitorMixin
     if defined?(OpenSSL::SSL)
       include OpenSSL
@@ -338,7 +338,7 @@ module Net
         # ProFTPD returns 425 for data connections if session is not reused.
         ssl_sock.session = @ssl_session
       end
-      ssl_sock.connect
+      ssl_socket_connect(ssl_sock, @open_timeout)
       if @ssl_context.verify_mode != VERIFY_NONE
         ssl_sock.post_connection_check(@host)
       end

test/net/ftp/test_ftp.rb

@@ -2100,6 +2100,30 @@ EOF
         ftp.close
       end
     end
+
+    def test_tls_connect_timeout
+      server = TCPServer.new(SERVER_ADDR, 0)
+      port = server.addr[1]
+      commands = []
+      sock = nil
+      @thread = Thread.start do
+        sock = server.accept
+        sock.print("220 (test_ftp).\r\n")
+        commands.push(sock.gets)
+        sock.print("234 AUTH success.\r\n")
+      end
+      begin
+        assert_raise(Net::OpenTimeout) do
+          Net::FTP.new("localhost",
+                       port: port,
+                       ssl: { ca_file: CA_FILE },
+                       open_timeout: 0.1)
+        end
+      ensure
+        sock.close if sock
+        server.close
+      end
+    end
   end
 
   def test_abort_tls