1# 2# SPDX-License-Identifier: BSD-2-Clause 3# 4# Copyright (c) 2017 Kristof Provost <kp@FreeBSD.org> 5# 6# Redistribution and use in source and binary forms, with or without 7# modification, are permitted provided that the following conditions 8# are met: 9# 1. Redistributions of source code must retain the above copyright 10# notice, this list of conditions and the following disclaimer. 11# 2. Redistributions in binary form must reproduce the above copyright 12# notice, this list of conditions and the following disclaimer in the 13# documentation and/or other materials provided with the distribution. 14# 15# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25# SUCH DAMAGE. 26# 27 28import threading 29import scapy.all as sp 30import sys 31 32class Sniffer(threading.Thread): 33 def __init__(self, args, check_function, recvif, timeout=3): 34 threading.Thread.__init__(self) 35 36 self._sem = threading.Semaphore(0) 37 self._args = args 38 self._timeout = timeout 39 self._recvif = recvif 40 self._check_function = check_function 41 self.correctPackets = 0 42 43 self.start() 44 if not self._sem.acquire(timeout=30): 45 raise Exception("Failed to start sniffer") 46 47 def _checkPacket(self, packet): 48 ret = self._check_function(self._args, packet) 49 if ret: 50 self.correctPackets += 1 51 return ret 52 53 def _startedCb(self): 54 self._sem.release() 55 56 def run(self): 57 self.packets = [] 58 self.packets = sp.sniff(iface=self._recvif, 59 stop_filter=self._checkPacket, timeout=self._timeout, 60 started_callback=self._startedCb) 61