message_buf = GNUNET_malloc(tsize);
ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
ping.challenge = htonl(va->challenge);
message_buf = GNUNET_malloc(tsize);
ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
ping.challenge = htonl(va->challenge);