![]() ![]() What we could do in libpcap is, if the snapshot length in the file header (pcap) or IDB (pcapng) is too large, just limit it to the maximum, and, if there actually are packets bigger than that, fail when we actually read them. That's less of an issue with ILP64 and LLP64, although there are more limits than just the address space size, so it could be an issue there as well. Wireshark doesn't have this issue because its library for reading capture files currently doesn't have a stable API, the Wireshark program don't make that assumption, and any third-party code that uses the library does so at its own risk.īoth libpcap and Wireshark impose a limit to prevent a file from causing the program to fill up the address space with a huge buffer and then fail. * allocated based on the return value of pcap_snapshot(). To read captured packets from a file sudo tcpdump -r capturedpackets.pcap This command will now read the captured packets from the capturedpackets.pcap file. * copy data from our buffer to a buffer of its own, sudo tcpdump -w capturedpackets.pcap -i wlo1 This command will now output all the captures packets in a file named as capturedpackets.pcap. * bigger than the snapshot length for example, it might * program might assume that it will never get packets * XXX - we don't grow the buffer here because some
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