Day 12 - Proxy III

15th鐵人賽 python for cybersecurity black hat python

monles_yen

2023-09-12 18:08:55

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This series of tutorials is aimed to share the notes taken while I was learning python for cybersecurity with the books - Black Hat Python.
這系列教學文章為學習筆記+延伸資源，旨在分享學習書籍 Black Hat Python時所思所學，也希望能幫助想了解Python和資安的大大們入門。

This tutorail has also been written in English in Medium.

看文前, 你應該要具備以下基礎能力:

Let's get started! 開始吧!

Proxy III

✨ ASCII表也可參照ascii-code.com

''.join([(len(repr(chr(i))) == 3) and chr(i) or '.' for i in range(256)])

完整程式碼

# proxy.py

import sys
import socket
import threading

HEX_FILTER = ''.join([(len(repr(chr(i))) == 3) and chr(i) or '.' for i in range(256)])

def hexdump(src, length=16, show=True):
    if isinstance(src, bytes):
        src = src.decode()
    results = list()
    for i in range(0, len(src), length):
        word = str(src[i:i+length])
        printable = word.translate(HEX_FILTER)
        hexa = ' '.join([f'{ord(c):02X}' for c in word])
        hexwidth = length*3
        results.append(f'{i:04x}  {hexa:<{hexwidth}}  {printable}')
    if show:
        for line in results:
            print(line)
    else:
        return results

print(hexdump("python rocks\n and prxies roll\n"))

1.

if isinstance(src, bytes):
        src = src.decode()

如果我們有字串，解碼它(decode it)

2.

word = str(src[i:i+length])

分別拾取字串中的一塊，並丟進變數 word 。
Grab a piece of the string to dump and put it into the word variable.

3.

printable = word.translate(HEX_FILTER)
hexa = ' '.join([f'{ord(c):02X}' for c in word])
hexwidth = length*3

為了裸字串(ASCII可印出的)對應的字元，用函式translate替代(substitute)每個字元的字串表徵(string representation of each character)
同樣地，裸字串(ASCII可印出的)對應的字元，我們替代了16進位表徵的整數( we substitute the hex representation of the integer value of every character in the raw string) (hexa)

Reference參考資料