diff --git a/tools/munger/tests/defs.py b/tools/munger/tests/defs.py
new file mode 100644
index 0000000..5cb779f
--- /dev/null
+++ b/tools/munger/tests/defs.py
@@ -0,0 +1,193 @@
+import sys
+sys.path.append('../../../src/python/oftest/protocol')
+from message import *
+from action import *
+from error import *
+from class_maps import *
+
+ofmsg_class_map_to_parents = {
+    action_enqueue                     : [ofp_action_enqueue],
+    action_output                      : [ofp_action_output],
+    action_set_dl_dst                  : [ofp_action_dl_addr],
+    action_set_dl_src                  : [ofp_action_dl_addr],
+    action_set_nw_dst                  : [ofp_action_nw_addr],
+    action_set_nw_src                  : [ofp_action_nw_addr],
+    action_set_nw_tos                  : [ofp_action_nw_tos],
+    action_set_tp_dst                  : [ofp_action_tp_port],
+    action_set_tp_src                  : [ofp_action_tp_port],
+    action_set_vlan_pcp                : [ofp_action_vlan_pcp],
+    action_set_vlan_vid                : [ofp_action_vlan_vid],
+    action_strip_vlan                  : [ofp_action_header],
+    action_vendor                      : [ofp_action_vendor_header],
+    aggregate_stats_entry              : [],
+    aggregate_stats_reply              : [ofp_stats_reply],
+    aggregate_stats_request            : [ofp_stats_request,
+                                          ofp_aggregate_stats_request],
+    bad_action_error_msg               : [ofp_error_msg],
+    bad_request_error_msg              : [ofp_error_msg],
+    barrier_reply                      : [],
+    barrier_request                    : [],
+    desc_stats_entry                   : [],
+    desc_stats_reply                   : [ofp_stats_reply],
+    desc_stats_request                 : [ofp_stats_request,
+                                          ofp_desc_stats_request],
+    echo_reply                         : [],
+    echo_request                       : [],
+    error                              : [ofp_error_msg],
+    features_reply                     : [ofp_switch_features],
+    features_request                   : [],
+    flow_mod                           : [ofp_flow_mod],
+    flow_mod_failed_error_msg          : [ofp_error_msg],
+    flow_removed                       : [ofp_flow_removed],
+    flow_stats_entry                   : [ofp_flow_stats],
+    flow_stats_reply                   : [ofp_stats_reply],
+    flow_stats_request                 : [ofp_stats_request,
+                                          ofp_flow_stats_request],
+    get_config_reply                   : [ofp_switch_config],
+    get_config_request                 : [],
+    hello                              : [],
+    hello_failed_error_msg             : [ofp_error_msg],
+    packet_in                          : [ofp_packet_in],
+    packet_out                         : [ofp_packet_out],
+    port_mod                           : [ofp_port_mod],
+    port_mod_failed_error_msg          : [ofp_error_msg],
+    port_stats_entry                   : [],
+    port_stats_reply                   : [ofp_stats_reply],
+    port_stats_request                 : [ofp_stats_request,
+                                          ofp_port_stats_request],
+    port_status                        : [ofp_port_status],
+    queue_get_config_reply             : [ofp_queue_get_config_reply],
+    queue_get_config_request           : [ofp_queue_get_config_request],
+    queue_op_failed_error_msg          : [ofp_error_msg],
+    queue_stats_entry                  : [],
+    queue_stats_reply                  : [ofp_stats_reply],
+    queue_stats_request                : [ofp_stats_request,
+                                          ofp_queue_stats_request],
+    set_config                         : [ofp_switch_config],
+    stats_reply                        : [ofp_stats_reply],
+    stats_request                      : [ofp_stats_request],
+    table_stats_entry                  : [],
+    table_stats_reply                  : [ofp_stats_reply],
+    table_stats_request                : [ofp_stats_request,
+                                          ofp_table_stats_request],
+    vendor                             : [ofp_vendor_header]
+}
+
+ofmsg_names = {
+    action_enqueue                     : 'action_enqueue',
+    action_output                      : 'action_output',
+    action_set_dl_dst                  : 'action_set_dl_dst',
+    action_set_dl_src                  : 'action_set_dl_src',
+    action_set_nw_dst                  : 'action_set_nw_dst',
+    action_set_nw_src                  : 'action_set_nw_src',
+    action_set_nw_tos                  : 'action_set_nw_tos',
+    action_set_tp_dst                  : 'action_set_tp_dst',
+    action_set_tp_src                  : 'action_set_tp_src',
+    action_set_vlan_pcp                : 'action_set_vlan_pcp',
+    action_set_vlan_vid                : 'action_set_vlan_vid',
+    action_strip_vlan                  : 'action_strip_vlan',
+    action_vendor                      : 'action_vendor',
+    aggregate_stats_entry              : 'aggregate_stats_entry',
+    aggregate_stats_reply              : 'aggregate_stats_reply',
+    aggregate_stats_request            : 'aggregate_stats_request',
+    bad_action_error_msg               : 'bad_action_error_msg',
+    bad_request_error_msg              : 'bad_request_error_msg',
+    barrier_reply                      : 'barrier_reply',
+    barrier_request                    : 'barrier_request',
+    desc_stats_entry                   : 'desc_stats_entry',
+    desc_stats_reply                   : 'desc_stats_reply',
+    desc_stats_request                 : 'desc_stats_request',
+    echo_reply                         : 'echo_reply',
+    echo_request                       : 'echo_request',
+    error                              : 'error',
+    features_reply                     : 'features_reply',
+    features_request                   : 'features_request',
+    flow_mod                           : 'flow_mod',
+    flow_mod_failed_error_msg          : 'flow_mod_failed_error_msg',
+    flow_removed                       : 'flow_removed',
+    flow_stats_entry                   : 'flow_stats_entry',
+    flow_stats_reply                   : 'flow_stats_reply',
+    flow_stats_request                 : 'flow_stats_request',
+    get_config_reply                   : 'get_config_reply',
+    get_config_request                 : 'get_config_request',
+    hello                              : 'hello',
+    hello_failed_error_msg             : 'hello_failed_error_msg',
+    ofp_desc_stats_request             : 'ofp_desc_stats_request',
+    ofp_table_stats_request            : 'ofp_table_stats_request',
+    packet_in                          : 'packet_in',
+    packet_out                         : 'packet_out',
+    port_mod                           : 'port_mod',
+    port_mod_failed_error_msg          : 'port_mod_failed_error_msg',
+    port_stats_entry                   : 'port_stats_entry',
+    port_stats_reply                   : 'port_stats_reply',
+    port_stats_request                 : 'port_stats_request',
+    port_status                        : 'port_status',
+    queue_get_config_reply             : 'queue_get_config_reply',
+    queue_get_config_request           : 'queue_get_config_request',
+    queue_op_failed_error_msg          : 'queue_op_failed_error_msg',
+    queue_stats_entry                  : 'queue_stats_entry',
+    queue_stats_reply                  : 'queue_stats_reply',
+    queue_stats_request                : 'queue_stats_request',
+    set_config                         : 'set_config',
+    stats_reply                        : 'stats_reply',
+    stats_request                      : 'stats_request',
+    table_stats_entry                  : 'table_stats_entry',
+    table_stats_reply                  : 'table_stats_reply',
+    table_stats_request                : 'table_stats_request',
+    vendor                             : 'vendor'
+}
+
+stats_entry_types = [
+    aggregate_stats_entry,
+    desc_stats_entry,
+    port_stats_entry,
+    queue_stats_entry,
+    table_stats_entry
+]
+
+##@var A list of all OpenFlow messages including subtyped messages
+of_messages = [
+    aggregate_stats_reply,
+    aggregate_stats_request,
+    bad_action_error_msg,
+    bad_request_error_msg,
+    barrier_reply,
+    barrier_request,
+    desc_stats_reply,
+    desc_stats_request,
+    echo_reply,
+    echo_request,
+    features_reply,
+    features_request,
+    flow_mod,
+    flow_mod_failed_error_msg,
+    flow_removed,
+    flow_stats_reply,
+    flow_stats_request,
+    get_config_reply,
+    get_config_request,
+    hello,
+    hello_failed_error_msg,
+    packet_in,
+    packet_out,
+    port_mod,
+    port_mod_failed_error_msg,
+    port_stats_reply,
+    port_stats_request,
+    port_status,
+    queue_get_config_reply,
+    queue_get_config_request,
+    queue_op_failed_error_msg,
+    queue_stats_reply,
+    queue_stats_request,
+    set_config,
+    table_stats_reply,
+    table_stats_request,
+    vendor
+]
+
+# header_fields = ['version', 'xid']
+# fixed_header_fields = ['type', 'length']
+
+all_objs = ofmsg_class_map_to_parents.keys()
+all_objs.sort()