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filters.py
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filters.py
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# Copyright (C) 2010 Sara Dar
# Released under GNU LGPL 2.1
# See LICENSE.txt for more information
import wx
import operator
import os
import binascii
import sys
#import matchqandr as qr
from socket import inet_ntoa
import pcap
import dpkt
import keyword
#import mappings as map
import decimal
class Filters:
list=[]
SrcAndDst=[]
SrcAndDstAndTid=[]
Tid=[]
def __init__(self):
#self.m=map.Mappings()
pass
def check_filter_validity(self,values):
count=0
j=3
k=0
parameters=['src','dst','data','tid','tid','srcport',
'dstport','token'
,'qts','rts','RTT','infohash']
operators=['==','!=','>=','<=','>','<',]
keywords=['and','or']
flist=values.split()
#print filtered
if len(flist)< 3:
print'filter incomplete'
return False
elif len(flist)==3:
count=1
elif len(flist)>3:
for j in range(len(flist)):
if keyword.iskeyword(flist[j]):
#print 'ok..it is key word',flist[j]
count = count + 1
j=j+4
for i in range(count):
if flist[k]in parameters:
if not (flist[k]=='rts'or flist[k]=='qts' or flist[k]=='RTT'):
if (flist[k+1]== '==' or flist[k+1]== '!='):
pass
else:
print 'Wrong operator with wrong parameter'
return False
k=k+1
else:
print 'wrong parameter',flist[k]
#print 'i value is',k
return False
if flist[k]in operators:
k=k+1
else:
print 'wrong operator',flist[k]
return False
if len(flist[k]) <= 50:
k=k+1
else:
print 'wrong value',flist[k]
return False
if len(flist)> 3:
if len(flist)>=k+4:
if flist[k]in keywords:
pass
k=k+1
else:
print 'wrong keyword',flist[k]
return False
else:
print 'incomplete filter'
return False
return True
def filter_data(self,list1,fexlist):
#length_filterlist = len(flist)
count=0
j=3
k=3
m=2
n=0
p=1
#obj = qr.MatchQandR(filename)
#list1=obj.all_query_response_inline()
for j in range(len(fexlist)):
if keyword.iskeyword(fexlist[j]):
#print 'ok..it is key word',flist[j]
count = count + 1
j=j+4
data1=self.get_data(fexlist[n],fexlist[p],fexlist[m],list1)
if len(fexlist)< 4:
return data1
elif len(fexlist)> 4:
for i in range(count):
n=n+4
m=m+4
p=p+4
#if list[k]:
if keyword.iskeyword(fexlist[k]):
if fexlist[k]== 'and':
k=k+4
if data1:
data1=self.get_data(fexlist[n],fexlist[p],
fexlist[m],data1)
elif fexlist[k]== 'or':
k=k+4
data2 = self.get_data(fexlist[n],fexlist[p],
fexlist[m],list1)
data1 = data1 + filter(lambda x: x not in data1,data2)
return data1
def get_data(self,parameter,operator, value,data):
filterlist=[]
if parameter == 'src'and operator == '==':
#for i in range(len(list1)):
filtered = filter(lambda x:x[0].src_addr[0]== value,data )
#print data[0][0][0]
return filtered
elif parameter == 'src'and operator == '!=':
#for i in range(len(list1)):
filtered = filter(lambda x:not(x[0].src_addr[0]== value),data )
#print data[0][0][0]
return filtered
elif parameter== 'dst' and operator == '==':
#for i in range(len(list1)):
filtered = filter(lambda x:not x[1]=='bogus' and
x[1].src_addr[0] == value,data )
#print data[1][0][0]
return filtered
elif parameter == 'dst'and operator == '!=':
filtered = filter(lambda x:not x[1]=='bogus' and
not(x[1].src_addr[0] == value),data )
return filtered
elif parameter == 'data'and operator == '==':
filtered = filter(lambda x:x[0].query_type==value,data )
return filtered
elif parameter == 'data'and operator == '!=':
filtered = filter(lambda x:not(x[0].query_type==value),data )
return filtered
elif parameter == 'tid' and operator == '==':
filtered = filter(lambda x:x[0].hexaTid==value,data )
return filtered
elif parameter == 'tid' and operator == '!=':
filtered = filter(lambda x:not(x[0].hexaTid==value),data )
return filtered
#elif parameter == 'tid' and operator == '==':
# filtered = filter(lambda x:binascii.hexlify(x[0].tid)
# ==binascii.hexlify(value),data )
# return filtered
#elif parameter == 'tid' and operator == '!=':
# filtered = filter(lambda x:not(x[0].tid==value),data )
# return filtered
elif parameter == 'srcport' and operator == '==':
filtered = filter(lambda x:x[0].src_addr[1]
==int(value),data )
return filtered
elif parameter == 'srcport' and operator == '!=':
filtered = filter(lambda x:not(x[0].src_addr[1]
==int(value)),data )
return filtered
elif parameter == 'dstport'and operator == '==':
filtered = filter(lambda x:not x[1]=='bogus'
and x[1].src_addr[1]==int(value),data )
return filtered
elif parameter == 'dstport' and operator == '!=':
filtered = filter(lambda x:not x[1]=='bogus' and
not(x[1].src_addr[1]==int(value)),data )
return filtered
elif parameter == 'qts' or parameter == 'rts':
if parameter == 'qts':
c=0
elif parameter == 'rts':
c=1
if operator == '==':
filtered = filter(lambda x:not x[c]=='bogus'
and x[c].ts == float(value),data )
elif operator == '!=':
filtered = filter(lambda x:not x[c]=='bogus'
and not(x[c].ts == float(value)),data )
elif operator == '<=':
filtered = filter(lambda x:not x[c]=='bogus'
and x[c].ts <= float(value),data )
elif operator == '>=':
filtered = filter(lambda x:not x[c]=='bogus'
and x[c].ts >= float(value),data )
elif operator == '<':
filtered = filter(lambda x:not x[c]=='bogus'
and x[c].ts < float(value),data )
elif operator == '>':
filtered = filter(lambda x:not x[c]=='bogus'
and x[c].ts > float(value),data )
return filtered
elif parameter == 'RTT':
decimal.getcontext().prec = 4
val = decimal.Decimal(value)*1
if operator == '==':
#print float(value)
#for item in data:
# print item[2]
filtered = filter(lambda x:not x[1]=='bogus'
and x[2]==val,data )
#print filtered
elif operator == '!=':
filtered = filter(lambda x:not(x[2]==val),data)
elif operator == '<=':
filtered = filter(lambda x:x[2]<=val,data )
elif operator == '>=':
filtered = filter(lambda x:x[2]>=val,data )
elif operator == '<':
filtered = filter(lambda x:x[2] < val,data )
elif operator == '>':
filtered = filter(lambda x:x[2] > val,data )
return filtered
elif parameter == 'infohash':
if operator == '==':
filtered = filter(lambda x:x[0].query_type == 'announce_peer'
or x[0].query_type == 'get_peers'
and repr(x[0].infohash)==value,data )
return filtered
elif parameter == 'token':
if operator == '==':
filtered1 = filter(lambda x:x[0].query_type == 'announce_peer'
and x[0].token==value,data)
filtered2 = filter (lambda x:not x[1]== 'bogus'
and x[0].query_type == 'get_peers'
and x[1].token ==value,data )
filtered = filtered1+filtered2
return filtered