+#Test 6: Client accepts empty ticket.
+#Expected result: ClientHello extension seen; ServerHello extension seen;
+# NewSessionTicket message seen; Full handshake.
+clearall();
+$proxy->filter(\&ticket_filter);
+$proxy->start();
+checkmessages(6, "Empty ticket test", 1, 1, 1, 1);
+
+#Test 7-8: Client keeps existing ticket on empty ticket.
+clearall();
+($fh, $session) = tempfile();
+$proxy->serverconnects(3);
+$proxy->filter(undef);
+$proxy->clientflags("-sess_out ".$session);
+$proxy->start();
+$proxy->clearClient();
+$proxy->clientflags("-sess_in ".$session." -sess_out ".$session);
+$proxy->filter(\&inject_empty_ticket_filter);
+$proxy->clientstart();
+#Expected result: ClientHello extension seen; ServerHello extension seen;
+# NewSessionTicket message seen; Abbreviated handshake.
+checkmessages(7, "Empty ticket resumption test", 1, 1, 1, 0);
+clearclient();
+$proxy->clientflags("-sess_in ".$session);
+$proxy->filter(undef);
+$proxy->clientstart();
+#Expected result: ClientHello extension seen; ServerHello extension not seen;
+# NewSessionTicket message not seen; Abbreviated handshake.
+checkmessages(8, "Empty ticket resumption test", 1, 0, 0, 0);
+
+
+sub ticket_filter
+{
+ my $proxy = shift;
+
+ foreach my $message (@{$proxy->message_list}) {
+ if ($message->mt == TLSProxy::Message::MT_NEW_SESSION_TICKET) {
+ $message->ticket("");
+ $message->repack();
+ }
+ }
+}
+
+sub inject_empty_ticket_filter {
+ my $proxy = shift;
+
+ foreach my $message (@{$proxy->message_list}) {
+ if ($message->mt == TLSProxy::Message::MT_NEW_SESSION_TICKET) {
+ # Only inject the message first time we're called.
+ return;
+ }
+ }
+
+ my @new_message_list = ();
+ foreach my $message (@{$proxy->message_list}) {
+ push @new_message_list, $message;
+ if ($message->mt == TLSProxy::Message::MT_SERVER_HELLO) {
+ $message->set_extension(TLSProxy::Message::EXT_SESSION_TICKET, "");
+ $message->repack();
+ # Tack NewSessionTicket onto the ServerHello record.
+ # This only works if the ServerHello is exactly one record.
+ my $record = ${$message->records}[0];
+
+ my $offset = $message->startoffset + $message->encoded_length;
+ my $newsessionticket = TLSProxy::NewSessionTicket->new(
+ 1, "", [$record], $offset, []);
+ $newsessionticket->repack();
+ push @new_message_list, $newsessionticket;
+ }
+ }
+ $proxy->message_list([@new_message_list]);
+}
+