vietlq

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vietlq

How To TCP NAT Traversal using Node.js and a STUN Server

With the scarecity of IPv4 addresses, and IPv6 still not available at large, NAT traversal is becoming a necessity. Especially with the generalisation of Carrier-grade NATs that you can find on mobile connections. Even with IPv6 you may suffer NAT66. Imagine your mobile device that gets only a single Ipv6 address, and you want to share it on your computer.

The solution might be in a decentralized protocol for address attribution such

AndrewJakubowicz

// JS calling Rust
var addon = require('../native');

console.log(addon.hello());
// -> "hello node"

console.log(addon.adder(1,2));
// -> 3

console.log(addon.objAdder({a: 2, b: 5}));

chrise86

import React, {PropTypes} from 'react';
import classNames from 'classnames';

class BatchDropZone extends React.Component {

    static propTypes = {

        // function that recieves an array of files
        receiveFiles: PropTypes.func.isRequired,

vietlq

// https://gcc.gnu.org/onlinedocs/gcc-4.7.2/gcc/Function-Attributes.html
// https://infektor.net/posts/2017-01-19-using-cpp17-attributes-today.html
// Compiler flags: -Wall -Werror -Wextra -pedantic -Wunused-result -std=c++11
// Suggested macro names: HANDLE_OUTPUT / NODISCARD / MUST_HANDLE

#define HANDLE_OUTPUT __attribute__((warn_unused_result))

HANDLE_OUTPUT int critical_func()
{
    return 1234;

vietlq

/***
* Shoutouts:
* 
* Bytecode origin https://www.reddit.com/r/ethereum/comments/6ic49q/any_assembly_programmers_willing_to_write_a/dj5ceuw/
* Modified version of Vitalik's https://www.reddit.com/r/ethereum/comments/6c1jui/delegatecall_forwarders_how_to_save_5098_on/
* Credits to Jorge Izquierdo (@izqui) for coming up with this design here: https://gist.github.com/izqui/7f904443e6d19c1ab52ec7f5ad46b3a8
* Credits to Stefan George (@Georgi87) for inspiration for many of the improvements from Gnosis Safe: https://github.com/gnosis/gnosis-safe-contracts
* 
* This version has many improvements over the original @izqui's library like using REVERT instead of THROWing on failed calls.
* It also implements the awesome design pattern for initializing code as seen in Gnosis Safe Factory: https://github.com/gnosis/gnosis-safe-contracts/blob/master/contracts/ProxyFactory.sol

vietlq

/**
 * Base contract that all upgradeable contracts should use.
 * 
 * Contracts implementing this interface are all called using delegatecall from
 * a dispatcher. As a result, the _sizes and _dest variables are shared with the
 * dispatcher contract, which allows the called contract to update these at will.
 * 
 * _sizes is a map of function signatures to return value sizes. Due to EVM
 * limitations, these need to be populated by the target contract, so the
 * dispatcher knows how many bytes of data to return from called functions.

eatonphil

module MaybeMonad = struct
	type 'a t = None | Maybe of 'a

	let return (a: 'a) : 'a t = Maybe a

	let (>>=) (m: 'a t) (f: 'a -> 'b t) : 'b t = match m with
		| None -> None
		| Maybe a -> f a

	let get (m: 'a t) (a: 'a) = match m with

vietlq

module MaybeMonad = struct
	type 'a t = None | Maybe of 'a

	let return (a: 'a) : 'a t = Maybe a

	let (>>=) (m: 'a t) (f: 'a -> 'b t) : 'b t = match m with
		| None -> None
		| Maybe a -> f a

	let get (m: 'a t) (a: 'a) = match m with

vietlq

# Raw transaction API example work-through
# Send coins to a 2-of-3 multisig, then spend them.
#
# For this example, I'm using these three keypairs (public/private)
# 0491bba2510912a5bd37da1fb5b1673010e43d2c6d812c514e91bfa9f2eb129e1c183329db55bd868e209aac2fbc02cb33d98fe74bf23f0c235d6126b1d8334f86 / 5JaTXbAUmfPYZFRwrYaALK48fN6sFJp4rHqq2QSXs8ucfpE4yQU
# 04865c40293a680cb9c020e7b1e106d8c1916d3cef99aa431a56d253e69256dac09ef122b1a986818a7cb624532f062c1d1f8722084861c5c3291ccffef4ec6874 / 5Jb7fCeh1Wtm4yBBg3q3XbT6B525i17kVhy3vMC9AqfR6FH2qGk
# 048d2455d2403e08708fc1f556002f1b6cd83f992d085097f9974ab08a28838f07896fbab08f39495e15fa6fad6edbfb1e754e35fa1c7844c41f322a1863d46213 / 5JFjmGo5Fww9p8gvx48qBYDJNAzR9pmH5S389axMtDyPT8ddqmw

# First: combine the three keys into a multisig address:
./bitcoind createmultisig 2 '["0491bba2510912a5bd37da1fb5b1673010e43d2c6d812c514e91bfa9f2eb129e1c183329db55bd868e209aac2fbc02cb33d98fe74bf23f0c235d6126b1d8334f86","04865c40293a680cb9c020e7b1e106d8c1916d3cef99aa431a56d253e69256dac09ef122b1a9