def is_matching(pktVal):
global nextNode
global matchHit
global tmpRuleBDD
global totalHitCount
global rjktdPkt
if str(pktVal) == "1":
matchHit += 1
log_data = "\tPacket has been accepted now ... and the hit count is "+str(matchHit) + "\n"
writeLog(log_data)
nextNode = "-1"
matchHit = 0
return True
elif str(pktVal) != "0":
nextNode = pktVal
matchHit += 1
return True
else:
matchHit += 1
nodeName = db._get_var_name(tmpRuleBDD, matchHit)
log_data = "\tPacket got rejected and the hit count is "+str(matchHit)+" and the node name is "+nodeName + "\n"
writeLog(log_data)
updateLastHitDb(nodeName)
nextNode = "-1"
totalHitCount = totalHitCount + matchHit # Updating the total hit count
rjktdPkt = rjktdPkt + 1 # Updating the rejected packet count now
matchHit = 0
return False
def pktMatcher(pktBin, ruleBDD):
global nextNode
global matchHit
global tmpRuleBDD
tmpRuleBDD = ruleBDD
tmp_h_table = {}
for data in ruleBDD['h_table'].items():
tmp_h_table[data[1]] = data[0]
for pktData in pktBin.items():
if str(nextNode) == "1":
log_data = "\tPacket has been accepted now ... and the hit count is "+str(matchHit) + "\n"
writeLog(log_data)
matchHit = 0
return
elif str(nextNode) != "-1":
if (db._get_var_name(ruleBDD, nextNode)) == pktData[0]:
if str(pktData[1]) == "0":
indice = int(pktData[1])+1
elif str(pktData[1]) == "1":
indice = 2
if not is_matching(tmp_h_table[nextNode][indice]):
return
else:
nextNode = nextNode - 1
while True:
if (db._get_var_name(ruleBDD, nextNode)) == pktData[0]:
break;
else:
nextNode = nextNode - 1
if str(pktData[1]) == "0":
indice = int(pktData[1])+1
elif str(pktData[1]) == "1":
indice = 2
if not is_matching(tmp_h_table[nextNode][indice]):
return
elif str(nextNode) == "-1":
nextNode = len(tmp_h_table)+1
if (db._get_var_name(ruleBDD, nextNode)) == pktData[0]:
if str(pktData[1]) == "0":
indice = int(pktData[1])+1
elif str(pktData[1]) == "1":
indice = 2
if not is_matching(tmp_h_table[nextNode][indice]):
return
else:
nextNode = nextNode - 1
while True:
if (db._get_var_name(ruleBDD, nextNode)) == pktData[0]:
break;
else:
nextNode = nextNode - 1
if str(pktData[1]) == "0":
indice = int(pktData[1])+1
elif str(pktData[1]) == "1":
indice = 2
if not is_matching(tmp_h_table[nextNode][indice]):
return
