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POWhy thread is interrupted before the changes are complete
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  1. POWhy thread is interrupted before the changes are complete
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    copied!<p>I'm attempting to create python module for getting MAC adresses by IP addresses.</p> <pre><code>def getMACs(addressesList): def _processArp(pkt): spa = _inet_ntoa(pkt.spa) if pkt.op == dpkt.arp.ARP_OP_REPLY and spa in _cache.macTable: lock.acquire() try: _cache.macTable[spa] = _packedToMacStr(pkt.sha) _cache.notFilledMacs -= 1 finally: lock.release() if _cache.notFilledMacs == 0: thrd.stop() addresses = _parseAddresses(addressesList) _cache.registerCacheEntry("macTable", {}) _cache.registerCacheEntry("notFilledMacs", 0) _events.arpPacket += _processArp lock = threading.Lock() thrd = _CaptureThread(promisc=False, timeout_ms=30, filter="arp") thrd.start() for addr in addresses: if _sendArpQuery(addr): _cache.macTable[str(addr)] = None _cache.notFilledMacs += 1 thrd.join(125) thrd.stop() return _cache.macTable if __name__ == "__main__": macTable = getMACs([IPAddress("192.168.1.1"), IPAddress("192.168.1.3")]) _pprint.pprint(macTable) </code></pre> <p>When I run this module I get</p> <pre><code>{'192.168.1.1': '00:11:95:9E:25:B1', '192.168.1.3': None} </code></pre> <p>When I debug _processArp step by step I get</p> <pre><code>{'192.168.1.1': '00:11:95:9E:25:B1', '192.168.1.3': '00:21:63:78:98:8E'} </code></pre> <p>Class CaptureThread:</p> <pre><code>class CaptureThread(threading.Thread): def __init__ (self, name=None, snaplen=65535, promisc=True, timeout_ms=0, immediate=False, filter=None): threading.Thread.__init__(self) self.__running = True self.__name = name self.__snaplen = snaplen self.__promisc = promisc self.__timeout_ms = timeout_ms self.__immediate = immediate self.__filter = filter def stop(self): self.__running = False def run(self): self.__pc = pcap.pcap(self.__name, self.__snaplen, self.__promisc, self.__timeout_ms, self.__immediate) if self.__filter: self.__pc.setfilter(self.__filter) while self.__running: self.__pc.dispatch(1, self.__processPacket) def __processPacket(self, timestamp, pkt): peth = dpkt.ethernet.Ethernet(pkt) if isinstance(peth.data, dpkt.arp.ARP): _events.arpPacket(peth.data) </code></pre>
 

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