Hiya hiya - I'm Wunorse Openslae!
I've been playing a bit with CAN bus. Are you a car hacker?
I'd love it if you could take a look at this terminal for me.
I'm trying to figure out what the unlock code is in this CAN bus log.
When it was grabbing this traffic, I locked, unlocked, and locked the doors one more time.
It ought to be a simple matter of just filtering out the noise until we get down to those three actions.
Need more of a nudge? Check out Chris Elgee's talk on CAN traffic!
TL;DR - Answer
On the left side of the roof near the sleigh (see map)
You can hide lines you don't want to see with commands like
cat file.txt | grep -v badstuff
Chris Elgee is talking about how CAN traffic works right now!
The easiest way to accomplish this challenge is to wait until you are Santa (after completing Objective 5). As Santa, you can access the sleigh on the roof. To start, let's set up filters to hide all of the recurring messages
At this point there shouldn't be any new messages scrolling across the screen. Now we can press the Lock and Unlock buttons and see only the messages we care about. Pressing Lock produces the message
19B#000000000000, and Unlock produces the message
19B#00000F000000. With this knowledge we can go to the CAN-Bus terminal and grep for just the
elf@9a18d3ed4716:~$ ls candump.log runtoanswer elf@9a18d3ed4716:~$ grep "19B#00000F000000" candump.log (1608926671.122520) vcan0 19B#00000F000000 elf@9a18d3ed4716:~$ ./runtoanswer 122520 Your answer: 122520 Checking.... Your answer is correct!
runanswerto complete the challenge.