owen800q

Mike's x86-64 Assembly (ASM) Notes

Assembling Binary Machine Code

Operating `Modes`:

These determine the assumed/default size of instruction operands, and restricts which opcodes are available, and how they are used.

Modern operating systems, booted inside Real mode,

Async Await Best Practices Cheat Sheet

Summary of Asynchronous Programming Guidelines

Name	Description	Exceptions
Avoid async void	Prefer async Task methods over async void methods	Event handlers
Async all the way	Don't mix blocking and async code	Console main method
Configure context	Use `ConfigureAwait(false)` when you can	Methods that require context

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

	public void nativeGenerate2() {
	System.out.println("start call nativeGenerate2");
	DvmClass SecureNative_cls = vm.resolveClass("com/xunmeng/pinduoduo/secure/SecureNative");
	DvmObject<?> context = vm.resolveClass("android/content/Context").newObject(null);
	int context_ptr = vm.addLocalObject(context);
	int str1_ptr = vm.addLocalObject(new StringObject(vm, ""));
	int str2_ptr = vm.addLocalObject(new StringObject(vm, "Ck5UqWFzreofeABcWvkAAg=="));
	int str3_ptr = vm.addLocalObject(new StringObject(vm, "1Hdy4cQW"));
	int str4_ptr = vm.addLocalObject(new StringObject(vm, "/storage/emulated/0"));
	int str5_ptr = vm.addLocalObject(new StringObject(vm, "version=134&info=g6iUSuzNlWeDi%2FxPng%2FN%2B8ZyQEP%2FnQuHC42hkmSWvCOg79IqfkRW5Lu3jsAh0QwizbgZZSg1FOEI%0Ao4R%2F6pw6XXsv%2FxH%2FzUDXzxJ5UXUYGMSYhF%2BULFIhbWMihyiUWSRA%2FamuTFPOOd17oppNLL6QvlSp%0A9rC2BHcgOMfMaYgq0uuiVDJB4cXNREX10fgGf20jz56kh%2B6ejh1iHIEYffs3OKbtp9M7FqmSpiQY%0AuAHzn7rCorHuZDP8tyvStvBqpdDxO92eeEt%2BprLDqsM1HfA%2BX3ItGURbaT4%2BQ

	console.log("Loading script...");

	var getaddrinfoPtr = Module.findExportByName(null, 'getaddrinfo')
	var connectPtr = Module.findExportByName(null, 'connect')
	var sendPtr = Module.findExportByName(null, 'send')
	var recvPtr = Module.findExportByName(null, 'recv')

	var getaddrinfoFunction = new NativeFunction(getaddrinfoPtr, 'int', ['pointer', 'pointer', 'pointer', 'pointer'])
	var connectFunction = new NativeFunction(connectPtr, 'int', ['int', 'pointer', 'int'])
	var sendFunction = new NativeFunction(sendPtr, 'int', ['int', 'pointer', 'int', 'int'])

	const utils = {
	colors: {
	red: function(string) {
	return '\x1b[31m' + string + '\x1b[0m';
	},

	green: function(string) {
	return '\x1b[32m' + string + '\x1b[0m';
	},

	/* Android ssl certificate pinning bypass script for various methods
	by Maurizio Siddu

	Run with:
	frida -U -f [APP_ID] -l frida_multiple_unpinning.js --no-pause
	*/

	setTimeout(function() {
	Java.perform(function () {
	console.log('');

	/**
	* run the script to a running app: frida -U "appName" -l flutter_ios.js --no-pause
	* start app direct with the script: frida -Uf bundleIdentifier -l flutter_ios.js --no-pause
	*/
	// #############################################
	// HELPER SECTION START
	var colors = {
	"resetColor": "\x1b[0m",
	"green": "\x1b[32m",
	"yellow": "\x1b[33m",