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test for pcap on Raspberry
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68
tests/test_pcap.py
Executable file
68
tests/test_pcap.py
Executable file
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# test
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import pcap
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import time
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class tester():
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def findEthernetAdaptor(self):
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self.strInterfaceName="eth0" # default, if the real is not found
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print("Interfaces:\n" + '\n'.join(pcap.findalldevs()))
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for i in range(0, 10):
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strInterfaceName = pcap.ex_name("eth"+str(i))
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if (strInterfaceName == '\\Device\\NPF_{E4B8176C-8516-4D48-88BC-85225ABCF259}'):
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print("This is the wanted Ethernet adaptor.")
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self.strInterfaceName="eth"+str(i)
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print("eth"+ str(i) + " is " + strInterfaceName)
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def __init__(self):
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self.nPacketsReceived = 0
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#self.sniffer = pcap.pcap(name=None, promisc=True, immediate=True, timeout_ms=50)
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# eth3 means: Third entry from back, in the list of interfaces, which is provided by pcap.findalldevs.
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# Improvement necessary: select the interface based on the name.
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# For debugging of the interface names, we can patch the file
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# C:\Users\uwemi\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\pcap\_pcap_ex.py,
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# in the function
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# def name(name: bytes) -> bytes:
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# in the place after
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# if i == idx:
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# print("index match at " + str(i) + " dev name=" + str(dev.name) + " dev.description=" + str(dev.description))
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# This will print the description of the used interface.
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#
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# Patch for non-blocking read-iteration:
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# in _pcap.py, function def __next__(self), in the case of timeout (if n==0), we need to "raise StopIteration" instead of "continue".
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#
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self.findEthernetAdaptor()
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self.sniffer = pcap.pcap(name=self.strInterfaceName, promisc=True, immediate=True, timeout_ms=10)
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self.sniffer.setnonblock(True)
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print("sniffer created at " + self.strInterfaceName)
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def mainfunction(self):
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# print("will evaluate self.sniffer")
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for ts, pkt in self.sniffer: # attention: for using this in non-blocking manner, we need the patch described above.
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self.nPacketsReceived+=1
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# print('%d' % (ts)) # the time stamp
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def callbackfunction(self, timestamp, pkt, *args):
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print("the callback")
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self.nPacketsReceived+=1
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print("#" + str(self.nPacketsReceived) + ":" + '%d' % (timestamp)) # the time stamp
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def mainfunction_new(self):
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# https://stackoverflow.com/questions/31305712/how-do-i-make-libpcap-pcap-loop-non-blocking
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# Tell the sniffer to give exactly one received packet to the callback function:
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self.sniffer.dispatch(1, self.callbackfunction, None)
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def close(self):
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self.sniffer.close()
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t=tester()
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for i in range(0, 10):
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print("Loop nr " + str(i))
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time.sleep(0.01)
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t.mainfunction_new()
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t.close()
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