Major nDPId extension. Sorry for the huge commit.

- nDPId: fixed invalid IP4/IP6 tuple compare
 - nDPIsrvd: fixed caching issue (finally)
 - added tiny c example (can be used to check flow manager sanity)
 - c-captured: use flow_last_seen timestamp from `struct nDPIsrvd_flow`
 - README.md update: added example JSON sequence
 - nDPId: added new flow event `update` necessary for correct
   timeout handling (and other future use-cases)
 - nDPIsrvd.h and nDPIsrvd.py: switched to an instance
   (consists of an alias/source tuple) based flow manager
 - every flow related event **must** now serialize `alias`, `source`,
   `flow_id`, `flow_last_seen` and `flow_idle_time` to make the timeout
   handling and verification process work correctly
 - nDPIsrvd.h: ability to profile any dynamic memory (de-)allocation
 - nDPIsrvd.py: removed PcapPacket class (unused)
 - py-flow-dashboard and py-flow-multiprocess: fixed race condition
 - py-flow-info: print statusbar with probably useful information
 - nDPId/nDPIsrvd.h: switched from packet-flow only timestamps (`pkt_*sec`)
   to a generic flow event timestamp `ts_msec`
 - nDPId-test: added additional checks
 - nDPId: increased ICMP flow timeout
 - nDPId: using event based i/o if capturing packets from a device
 - nDPIsrvd: fixed memory leak on shutdown if remote descriptors
   were still connected

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>

examples/py-flow-muliprocess/py-flow-multiprocess.py

@@ -19,28 +19,41 @@ def mp_worker(unused, shared_flow_dict):
     import time
     while True:
         s = str()
+        n = int()
+
         for key in shared_flow_dict.keys():
-            s += '{}, '.format(str(key))
+            try:
+                flow = shared_flow_dict[key]
+            except KeyError:
+                continue
+
+            s += '{}, '.format(str(flow.flow_id))
+            n += 1
+
         if len(s) == 0:
             s = '-'
         else:
             s = s[:-2]
-        print('Flows: {}'.format(s))
+
+        print('Flows({}): {}'.format(n, s))
         time.sleep(1)
 
 
-def nDPIsrvd_worker_onJsonLineRecvd(json_dict, current_flow, global_user_data):
+def nDPIsrvd_worker_onFlowCleanup(instance, current_flow, global_user_data):
     shared_flow_dict = global_user_data
 
-    if 'flow_event_name' not in json_dict:
+    del shared_flow_dict[current_flow.flow_id]
+
+    return True
+
+
+def nDPIsrvd_worker_onJsonLineRecvd(json_dict, instance, current_flow, global_user_data):
+    shared_flow_dict = global_user_data
+
+    if 'flow_id' not in json_dict:
         return True
 
-    if json_dict['flow_event_name'] == 'new':
-        shared_flow_dict[json_dict['flow_id']] = current_flow
-    elif json_dict['flow_event_name'] == 'idle' or \
-            json_dict['flow_event_name'] == 'end':
-        if json_dict['flow_id'] in shared_flow_dict:
-            del shared_flow_dict[json_dict['flow_id']]
+    shared_flow_dict[current_flow.flow_id] = current_flow
 
     return True
 
@@ -54,7 +67,9 @@ def nDPIsrvd_worker(address, shared_flow_dict):
 
     nsock = nDPIsrvdSocket()
     nsock.connect(address)
-    nsock.loop(nDPIsrvd_worker_onJsonLineRecvd, shared_flow_dict)
+    nsock.loop(nDPIsrvd_worker_onJsonLineRecvd,
+               nDPIsrvd_worker_onFlowCleanup,
+               shared_flow_dict)
 
 
 if __name__ == '__main__':