The is ziffy for YAZ. ziffy is a promiscuous Z39.50 APDU sniffer Copyright (c) 1998-2007 Rocco Carbone Copyright (c) 2007-2008 Index Data See README.old for Rocco's original introduction. ziffy is coverved by GPLv2. See COPYING for more information. In order to compile ziffy, a BSD like system with libpcap and libyaz3 is required. When these components are installed, usually ./configure make sudo make install is sufficient to install ziffy (a program) and the man page ziffy.1 in /usr/local or other prefix (if given).