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cap.py
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cap.py
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#!/usr/bin/env python3
# Ethernet packets capturer.
# Copyright (C) 2015 Ubiquiti Networks (yuchi.chen@ubnt.com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# Run: sudo ./cap.py
#
import os, sys,time
import pycap
import threading
import struct
class Capturer(threading.Thread):
def __init__(self, ifname, filename=None):
threading.Thread.__init__(self)
self.ifname = ifname
self.cntOfPkts = 0
self.capturing = False
self.filename = filename
self.fo = None
def run(self):
self.capturing = True
fo = None
if self.filename!=None:
fo = open(self.filename, "wb")
self.fo = fo
pycap.capture(self.ifname, self.capture)
if fo!=None:
self.fo = None
fo.close()
self.capturing = False
def capture(self, ifname, sec, usec, pkt_arr):
self.cntOfPkts = self.cntOfPkts + 1
print("[%s]GOT (%d sec, %d usec)" % (ifname, sec, usec))
if self.fo!=None:
self.fo.write(struct.pack("i", sec))
self.fo.write(struct.pack("i", usec))
self.fo.write(struct.pack("i", len(pkt_arr)))
self.fo.write(pkt_arr)
#if self.cntOfPkts>10:
# pycap.stop_capture(self.ifname)
def stopCapture(self):
if not self.capturing: return
#print("Try to stop %s" % self.ifname)
pycap.stop_capture(self.ifname)
'''
COUNT = 0
def got_pkt(ifname, sec, usec, pkt_arr):
global COUNT
COUNT = COUNT+1
print("[%s]GOT (%d sec, %d usec, %s)" % (ifname, sec, usec, pkt_arr))
if COUNT>10:
pycap.stop_capture("eth0")
'''
capturers = []
if len(sys.argv) > 1:
for i in range(1, len(sys.argv)):
cap = Capturer(sys.argv[i], filename=sys.argv[i]+".raw")
cap.start()
capturers.append(cap)
if len(capturers)>0:
#print("Start")
while(True):
cmd = input("?")
if cmd=="stop":
for cap in capturers:
cap.stopCapture()
cap.join()
break
'''
time.sleep(1) # wait thread running
while(True):
stopCnt = 0
for cap in capturers:
if cap.cntOfPkts>10:
cap.stopCapture()
cap.join()
if not cap.capturing: stopCnt = stopCnt+1
if stopCnt >= len(capturers): break
time.sleep(1)
'''
#print("Stop");