![]() One key characteristic of TCP is that it’s a connection-oriented protocol. Specifically, we’ll set up a lab to analyze and extract Real-time Transport Protocol (RTP) data from a Voice over IP (VoIP) network and then reconstruct the original message using the extracted information. To successfully perform reverse engineering, engineers need a basic understanding of Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) as they relate to networks, as well as how these protocols can be sniffed or eavesdropped and reconstructed. For the purpose of explaining the network basics required for reverse engineering, this article will focus on how the Wireshark application can be used to extract protocols and reconstruct them. The vendor has a custom driver, support for which ended in Linux 4.9īy now was curious about how all this worked and began digging, aiming to create a userspace driver for the device.Put simply, network reverse engineering is the art of extracting network/application-level protocols utilized by either an application or a client server. Never have to haul a VGA monitor out again? Sounds good to us! The devices are old and abandoned hardware, but they do claim Linux supportīut when they did arrive, the devices didn’t enumerate as a USB UVC video device as expected. The Epiphan VGA2USB LR accepts VGA video on one end and presents it as a USB webcam-like video signal on the other. found some interesting USB devices on eBay. VGA Signal In A Browser Window, Thanks To Reverse Engineering You can find the code for this driver (and pre-built versions for Linux and OSX) on github: The developer also used NSA’s Ghidra to get an idea of what was going on inside of the real driver. ![]() Both tshark and tcpdump can read USB packets inside pcap files. ![]() To get information what goes on UBS bus, the developer loaded the usbmon module on the VM’s host machine and used Wireshark to take a packet capture of the USB traffic to and from the device during startup and whilst capturing video. Writing userspace USB drivers for abandoned devices Having picked up a bulk supply of VGA capture cards for pennies on the dollar, Cox sets out to get them working. Hackster.io reports:īen Cox Revives Epiphan’s VGA Capture Cards with Custom Reverse-Engineered Linux Driver Interesting read for people interested in Linux, USB and video technology. Developer Ben Cox sets out to get old VGA capture cards working on a modern Linux build. ![]()
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