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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Ref. https://wiki.python.org/moin/BitwiseOperators


def setbit(i, x):
    """
    set the bit at position x in integer i to 1
    """

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python forward.py :8080 google.com:80
[INFO]	2019-12-04 15:37:12 CST	('127.0.0.1', 54949) -> ':8080' -> 'google.com:80'
[DEBUG]	2019-12-04 15:37:12 CST	('127.0.0.1', 54949) -> 79 bytes -> ('172.217.10.78', 80)
[DEBUG]	2019-12-04 15:37:13 CST	('172.217.10.78', 80) -> 724 bytes -> ('127.0.0.1', 54949)


curl -I -H 'Host: www.google.com' localhost:8080
HTTP/1.1 200 OK
Date: Wed, 04 Dec 2019 07:37:13 GMT
Expires: -1

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• apnic
• maxmind
• IPdeny

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$ echo -en "message" | openssl dgst -sha256 -hmac "key" -binary | base64 | sed -e 's/+/-/g' -e 's/\//_/g' | tr -d =
bp7ym3X__Ft6uuUn1Y_a2y_kLnIZARl2kXNDBl9Y7Uo

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package main

import (
	"context"
	"flag"
	"fmt"
	"io"
	"log"
	"net"
	"net/http"

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escape() {
    sed -e 's/[]\/$*.^[]/\\&/g' <<<"${1}"
}

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# open utun device in OS X
# Refs:
# - https://github.com/python/cpython/blob/master/Modules/socketmodule.c
# - https://opensource.apple.com/source/xnu/xnu-4570.31.3/bsd/sys/kern_control.h.auto.html
# - https://opensource.apple.com/source/xnu/xnu-344.49/bsd/sys/sys_domain.h.auto.html
# - https://opensource.apple.com/source/xnu/xnu-2782.20.48/bsd/net/if_utun.h.auto.html
#

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package main

import (
	"flag"
	"fmt"
	"log"
	"net/http"
	"net/http/cgi"
	"os"
	"path"

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// Ref. https://medium.com/capital-one-tech/learning-to-use-go-reflection-822a0aed74b7
package main

import (
	"fmt"
	"reflect"
)

func main() {
	type CustomType struct {

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package main

import (
	"bytes"
	"crypto/tls"
	"io"
	"net"
	"time"
)