1# $FreeBSD$ 2# 3# SPDX-License-Identifier: BSD-2-Clause-FreeBSD 4# 5# Copyright (c) 2017 Kristof Provost <kp@FreeBSD.org> 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27# 28 29import threading 30import scapy.all as sp 31import sys 32 33class Sniffer(threading.Thread): 34 def __init__(self, args, check_function, recvif=None, timeout=3): 35 threading.Thread.__init__(self) 36 37 self._sem = threading.Semaphore(0) 38 self._args = args 39 self._timeout = timeout 40 if recvif is not None: 41 self._recvif = recvif 42 else: 43 self._recvif = args.recvif[0] 44 self._check_function = check_function 45 self.foundCorrectPacket = False 46 47 self.start() 48 if not self._sem.acquire(timeout=30): 49 raise Exception("Failed to start sniffer") 50 51 def _checkPacket(self, packet): 52 ret = self._check_function(self._args, packet) 53 if ret: 54 self.foundCorrectPacket = True 55 return ret 56 57 def _startedCb(self): 58 self._sem.release() 59 60 def run(self): 61 self.packets = [] 62 try: 63 self.packets = sp.sniff(iface=self._recvif, 64 stop_filter=self._checkPacket, timeout=self._timeout, 65 started_callback=self._startedCb) 66 except Exception as e: 67 print(e, file=sys.stderr) 68