René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"__str__ method is not safe","articleBody":"This code results with segmentation fault\r\n\r\n```\r\nfrom typing import List\r\n\r\nimport netfilterqueue\r\nfrom netfilterqueue import NetfilterQueue\r\n\r\n\r\npacket_storage: List[netfilterqueue.Packet] = []\r\n\r\n\r\ndef print_packets():\r\n    for packet in packet_storage:\r\n        print(packet)\r\n\r\n\r\ndef handle_packet(packet: netfilterqueue.Packet):\r\n    packet.retain()\r\n    packet.accept()\r\n    packet_storage.append(packet)\r\n    print_packets()\r\n\r\n\r\nq = NetfilterQueue()\r\nq.bind(11, handle_packet)\r\nq.run()\r\n```\r\nLooks like __str__ method is not safe, because there is no check for NULL  of `self.payload`:\r\n```\r\n    def __str__(self):\r\n        cdef iphdr *hdr = \u003ciphdr*\u003eself.payload\r\n        protocol = PROTOCOLS.get(hdr.protocol, \"Unknown protocol\")\r\n        return \"%s packet, %s bytes\" % (protocol, self.payload_len)\r\n ```\r\n\r\nIs this ok, can that be fixed? \r\n ","author":{"url":"https://github.com/elqver","@type":"Person","name":"elqver"},"datePublished":"2022-02-08T13:55:34.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/83/python-netfilterqueue/issues/83"}