How to parse packets in a python library? [closed]
Try scapy. It is a very powerful program for packet inspection, manipulation and creation. You can use it to build your own tools.
pcap
pcap struct pcap_pkthdr len vs caplen
Your understanding is correct, at least based on the pcap man page. caplen is the amount of data available to you in the capture. len was the actual length of the packet. I’m not aware of any cases that would give you a caplen > len. I usually seem them being equal as my snaplen … Read more
set a filter of packet length in wireshark
All these work on Wireshark’s filter frame.len==243 <- I use this ip.len==229 udp.length==209 data.len==201