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#include<time.h>
#include<unistd.h>

/*
 * snowflake.c
 *
 * a simple implementation of twitter snowflake in C
 *
 * wenwu500@gmail.com
 */

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local signal = require("posix.signal")
local socket = require("socket")
local string = require("string")

-- create a TCP socket and bind it to the local host, at any port
local server = assert(socket.bind("127.0.0.1", 0))
local ip, port = server:getsockname()

print(string.format("telnet %s %s", ip, port))

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# coding=utf-8

import random

__author__ = "wenwu500@qq.com"


def sample(population, k, odds=lambda item: 1.0):
    """
    Chooses k unique random elements from a population sequence with odds.

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#

import bisect


class AStarPathfinding(object):
    class Node(object):
        # item must be hashable

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#


class BaseBinaryHeap(object):
    def __init__(self, key=lambda x: x, value=lambda x: x):
        self.queue = list()
        self.index = dict()
        self.key = key

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"use strict";

function BinaryHeap(keyFunction, scoreFunction) {
    this.content = [];
    this.map = {};
    this.keyFunction = keyFunction || function (e) {
        return e;
    };
    this.scoreFunction = scoreFunction || function (e) {
        return e;

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iptables --table filter --append INPUT --match conntrack --ctstate ESTABLISHED,RELATED --match comment --comment "Allow established and related connections" --jump ACCEPT

iptables --table filter --append INPUT --protocol icmp --icmp-type echo-request --match length --length 84 --match recent --set --name openSSH --rsource --match comment --comment "ping before ssh" --jump LOG --log-prefix "OpenDoor SSH: " --log-level 7
iptables --table filter --append INPUT --protocol tcp --dport ssh --syn --match recent ! --rcheck --seconds 30 --name openSSH --rsource --match comment --comment "Drop SSH connection not pinged recently" --jump DROP

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#

import collections
import re

Token = collections.namedtuple('Token', ['tpe', 'value'])

Scanner = re.Scanner((

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Ref. https://stackoverflow.com/questions/667508/whats-a-good-rate-limiting-algorithm#answer-668327

import time


def limit(rate, burst=0.0):
    unit = 1.0

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
import random
import socket
import time


def traceroute(dest, hops=64, timeout=0.7):
    empty = bytes()