Return SERVFAIL if an exception is encountered during doQuery().

This is very preliminary; it should also log (at least to cerr)
the exception that occurred, and should clear the message sections
of any data they may have contained before the exception was thrown.


git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@1318 e5f2f494-b856-4b98-b285-d166d9295462

src/bin/auth/auth_srv.cc

@@ -150,8 +150,12 @@ AuthSrv::processMessage(InputBuffer& request_buffer,
     message.setDNSSECSupported(dnssec_ok);
     message.setUDPSize(4096);   // XXX: hardcoding
 
-    Query query(message, dnssec_ok);
-    impl_->data_sources_.doQuery(query);
+    try {
+        Query query(message, dnssec_ok);
+        impl_->data_sources_.doQuery(query);
+    } catch(...) {
+        message.setRcode(Rcode::SERVFAIL());
+    }
 
     response_renderer.setLengthLimit(udp_buffer ? remote_bufsize : 65535);
     message.toWire(response_renderer);