Why Does Pyshark Continue A Livecapture With A Timeout?

I mean, I suppose PyShark continues listening. My code is (within a class): def Capture(self, incoming): capture = pyshark.LiveCapture() capture.sniff(timeout=int(incomin

Solution 1:

I tried to use your code, but I couldn't get it to work correctly.

I know that there are some known issues with the way that capture.sniff(timeout=x) works, so I put together some other code that is using apply_on_packets with a timeout.

import pyshark
import asyncio

packet_list = []


defprocess_packets(packet):
    global packet_list
    try:
        packet_version = packet.layers[1].version
        layer_name = packet.layers[2].layer_name
        packet_list.append(f'{packet_version}, {layer_name}, {packet.length}')
    except AttributeError:
        passdefcapture_packets(timeout):
    capture = pyshark.LiveCapture(interface='en0')
    try:
      capture.apply_on_packets(process_packets, timeout=timeout)
    except asyncio.TimeoutError:
        passfinally:
        global packet_list
        for item in packet_list:
            print(item)


capture_packets(2)

I decided to rework your code. The code below works with capture.sniff(timeout=x).

import pyshark

packet_list = []

defcapture_packets(timeout):
    global packet_list

    capture = pyshark.LiveCapture(interface='en0')
    capture.sniff(timeout=timeout)
    packets = [pkt for pkt in capture._packets]
    capture.close()

    try:
        for packet in packets:
            packet_version = packet.layers[1].version
            layer_name = packet.layers[2].layer_name
            packet_list.append(f'{packet_version}, {layer_name}, {packet.length}')
    except AttributeError:
        passfinally:
        return packet_list


packets = capture_packets(2)
print(packets)
['4, tcp, 54', '6, icmpv6, 86', '6, icmpv6, 78', '4, tcp, 66']

I will answer any questions you have about the code examples above.

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My system information
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Platform:    macOS
Python:      3.8.0
Pyshark:     0.4.3
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