javascript strace parser for plaidctf three_eyed_fish: "three_eyed_fish 100 binary This binary is totally legit we promise" .- -. -.. ----- ..- ----- -.. .. -.. -. - ----- . ...- . -. ----- -. . . -.. ----- .- -. ----- .- .-. -.. ..- .. -. ---

three_eyed_fish.js

var fs = require('fs'),
	readline = require('readline');

var rd = readline.createInterface({
	input: fs.createReadStream('strace.log'),
	output: process.stdout,
	terminal: false
});
var morse = "";

var on = false;
var length = 0;
rd.on('line', function(line) {
	if (line === "ioctl(3, KDSETLED, 0x4)") {
		on = true;
		if (length === 1) {
			console.log("short off");
		} else {
			console.log("long off");
			morse += " ";
		}
		length = 0;
	}
	if (line === "nanosleep({0, 250000000}, 0x4b32)") {
		length += 1;
	}
	if (line === "ioctl(3, KDSETLED, 0)") {
		on = false;
		if (length === 1) {
			console.log("short on");
			morse += ".";
		} else {
			console.log("long on");
			morse += "-";
		}

		length = 0;
	}
});

rd.on('close', function(){
	console.log(morse);
});