![]() The output could now be used to pipe it to netcat (or directly send it from perl). Will read packets from the file "/tmp/tcp80", and print the HTTP requests. This module will not only reassemble the TCP streams, it will also extract HTTP requests: The probably easiest way to parse the packet capture, and extract the request, is the perl module "Sniffer::HTTP". ![]() You can only extract individual headers easily or the URLs. "tshark" does not have a simple feature to just extract the http requests. "wireshark" can be used to extract the data using the tcp stream reassembly feature, but this can't easily be scripted. "tcpreplay" may appear like the right tool, but it will just blindly replay the traffic, and the web server will not actually establish a connection. sending the packet capture to a web server ![]() extracting the HTTP requests from the packet capture. Is there a pcap filter for TCPDump that will allow be to filter zero window messages I know how to filter these in a wireshark display filter () but the amount of data I need to work with easily crashes wireshark (at least the 32 bit version) and breaking up the file and going through those captures is tedious. ![]() ![]() However, I am sometimes faced with a different problem: You do have a network capture of a set of HTTP requests, and you are trying to "replay" them in all of their beauty, which includes all headers and POST data if present. For example Jim Clausing's brilliant perl script, or the Wireshark "export features among many others (chaosreader, xplico, network miner. There are plenty of tools to extract files that are transmitted via HTTP. As a consequence, tcp((tcp12 & 0xf0) > 2) 0x16 captures every packet having the first byte after the TCP header set to 0x16. ![]()
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