I would like to write a communication sniffer for some IM, like ICQ or MSN. Can you please help me how to start? It's quite hard to find useful info how to do this. How should I start? I know that there is the winpcap library for windows that it is good for packet sniffing.
Search for the specification of the IM protocol you want to sniff
Learn how to use libpcap or similar e.g: winpcap
Download and study the source code of a IM Client, for example pidgin
Related
I’m looking to essentially use two devices: raspberry pi 3 and Mac 10.15. I am using the pi to capture video from my web cam and I want to use my Mac to kind of extend to the pi so when I use cv2.videocapture I can capture that same video in preferably real-time or something close. I’m programming this using python on bout devices. I thought of putting it on a local server and retrieving it but I have no idea how I could use that with opencv. If someone could provide and explain a useful example, I would greatly appreciate it. Thank you.
To transfer a video stream, you could use instead of a custom solution a RTMP server on the source machine feeding it with the cam source and the target opens the stream and processes it.
A similar approach to mine is widely implemented into IP cameras: They run a RTMP server to make the stream available for phones and PC.
I want to use a bluetoothmodul like this Waveshare Core51822 to send data to a raspberry. I want to use the SPI on the bluetooth modul but i dont have a plan how to configure that.
What do i need?
Thanks
The SPI and BLE are all documented extensively at http://infocenter.nordicsemi.com/, including examples, specifications, and an API.
In the future, you should give much more information about your situation. For instance, what platform/IDE are you using to develop? If your module is compatible, you would probably be best off using ARM's mbed compiler (https://os.mbed.com).
I've walkie-talkies sending the speech via RTP (G711a) into my LAN. My goal now is to take this audio-stream and provide it (one-to-many) to different Web-Clients. My preferred solution is to do this via WebRTC, but I can't find the right tools to deal with. My favorite environment is Node.js and C/C++.
Anybody out there who can help me, to find the right entry/the tools for this task?
I read an interesting article about coding for the AR Drone 2.0 from Parrot. In this code they us nodeJS to talk to the drone. Therefore the code starts out with creating a Stream to /dev/ttyO0
I am starting out to learn more about the background of linux functionalities and would like to know:
How do you initially find out that the dev/ttyO0 is being used, for example on the drone which runs on linux. It is kind of reverse engineering I think, but what tools or commands are being used therefore?
When I want to reverse engineer a system like the drone, and find out which commands are being sent, is there something like a "sniffer" to find out what commands are being sent?
I know this is not a short and easy answer, but I would be happy to learn more about that or find out, where to learn about that. But initially the question about finding the right device would be very interesting.
Thank you
I don't know the answer to the first part of your question, but I can address the second part.
Yes, the AR.Drone uses TCP and UDP for all communications between the drone and the controller app, including commands, telemetry and video. You can use a standard network sniffer, like tcpdump or Wireshark. When you connect to the drone, its default IP address is 192.168.1.1. Configure the sniffer to capture all traffic to and from that address. Here are some highlights of what you can see:
Command/"AT" comms, UDP on port 5556: This port is used to send commands to the drone. Commands are in ASCII, and look like AT*..., for example AT*REF=7,256 or AT*PCMD=7,1,-1110651699,0,0,1050253722. Section 6 of the AR.Drone Developer Guide describes most (but not all) of the commands.
Navdata, UDP on port 5554: This is binary encoded data sent from the drone containing sensor data and information about the state of the drone. It includes things like air pressure, altitude estimate, position estimate, flying mode, and GPS (if your drone is equipped with one). Since you mentioned Javascript, the file parseNavdata.js in the node-ar-drone library contains code to parse navdata.
Video, TCP on port 5555: This is realtime video from the drone in an almost-but-not-quite H264 format known as PaVE. The format is documented in section 7.3 of the Developer Guide, and most libraries for talking to AR.Drones can parse the format.
Another thing you may notice:
FTP: The official controller app uses standard FTP to send an ephemeris file to the drone that contains info that helps GPS get a faster lock.
I am looking at a project that requires the crafting of S1 Application Protocol (S1AP) packets. It is used between a eNodeB and MME of a 4G LTE network. S1AP is IP based and carried by the Steam Control Transmission Protocol (SCTP).
Does anyone have any idea if the current library for SCTP in Scapy is sufficient to do this, or I might have to define a new protocol?
My first goal is to emulate a connection (via a program) to a physical MME, anyone have any suggestions?
Thanks!
It depends on your development environment & requirement. In the case of linux/FreeBSD based development setup, the libsctp and ASN.1 tools should be enough for having S1-AP over SCTP protocol in the interface with the MME.
Coming to Scapy, note that it is based on python.
Scapy seems to have support for all types of SCTP chunks and so it must most probably be fine for your testing.
S1-AP protocol uses ASN.1. For generating S1-AP packets, you should integrate with ASN.1 for S1-AP encoding/decoding and use over scapy. Scapy provides support for ASN.1.
The S1-AP support extension should be done by you. The best part is that you can extend Scapy without having to edit source files for making your automated tool based on the type of requirement.