#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import os
import sys
import json
import time
import datetime
import random
import hashlib
import subprocess
import re
import requests
import atexit

import socket
import ssh2
from ssh2.error_codes import LIBSSH2_ERROR_EAGAIN
from ssh2.utils import wait_socket

import telnetlib
import ftplib


EXPLOIT_VIA_DROPBEAR = True


def die(*args):
  err = 1
  prefix = "ERROR: "
  msg = "<undefined>"
  if len(args) > 0:
    if isinstance(args[0], int):
      err = args[0]
    else:
      msg = args[0]
  if (err == 0):
    prefix = ""
  if len(args) > 1:
    msg = args[1]
  print(" ")
  print(prefix + msg)
  print(" ")
  sys.exit(err)

def get_http_headers():
  headers = {}
  headers["Content-Type"] = "application/x-www-form-urlencoded; charset=UTF-8"
  headers["User-Agent"] = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0"
  return headers


class Gateway():
  use_ssh = EXPLOIT_VIA_DROPBEAR
  verbose = 2
  timeout = 4
  config = {}
  device_name = None
  webpassword = None
  status = -2
  ftp = None
  socket = None  # TCP socket for SSH 
  ssh = None     # SSH session
  ssh_port = 122
  
  def __init__(self, timeout = 4, verbose = 2, detect_device = True):
    self.verbose = verbose
    self.timeout = timeout
    self.config['device_ip_addr'] = None
    self.load_config()
    self.device_name = None
    self.webpassword = None
    self.status = -2
    atexit.register(self.shutdown)
    os.makedirs('outdir', exist_ok = True)
    os.makedirs('tmp', exist_ok = True)
    if detect_device:
      self.detect_device()

  def detect_device(self):
    self.device_name = None
    self.status = -2
    try:
      r0 = requests.get("http://{ip_addr}/cgi-bin/luci/web".format(ip_addr = self.ip_addr), timeout = self.timeout)
      r0.raise_for_status()
      #with open("r0.txt", "wb") as file:
      #  file.write(r0.text.encode("utf-8"))
      hardware = re.findall(r'hardware = \'(.*?)\'', r0.text)
      if hardware and len(hardware) > 0:
        self.device_name = hardware[0]
      else:
        hardware = re.findall(r'hardwareVersion: \'(.*?)\'', r0.text)
        if hardware and len(hardware) > 0:
          self.device_name = hardware[0]
      self.device_name = self.device_name.lower()
    except requests.exceptions.HTTPError as e:
      print("Http Error:", e)
    except requests.exceptions.ConnectionError as e:
      #print("Error Connecting:", e)
      return self.status
    except requests.exceptions.ConnectTimeout as e:
      print ("ConnectTimeout Error:", e)
    except requests.exceptions.Timeout as e:
      print ("Timeout Error:", e)
    except requests.exceptions.RequestException as e:
      print("Request Exception:", e)
    except Exception:      
      pass
    if not self.device_name:
      die("You need to make the initial configuration in the WEB of the device!")
    self.status = -1
    x = -1
    try:
      x = r0.text.find('a href="/cgi-bin/luci/web/init/hello')
    except:
      return self.status
    if (x > 10):
      self.webpassword = 'admin'
      die("You need to make the initial configuration in the WEB of the device!")
    self.status = 1
    return self.status

  def shutdown(self):
    if self.use_ssh:
      try:
        self.ssh.disconnect()
      except Exception:
        pass
      try:
        self.socket.close()
      except Exception:
        pass
    else:  
      try:
        self.ftp.quit()
      except Exception:
        pass
      try:
        self.ftp.close()
      except Exception:
        pass
    self.ftp = None
    self.ssh = None
    self.socket = None
    
  @property
  def ip_addr(self):
    return self.config['device_ip_addr']

  @ip_addr.setter
  def ip_addr(self, value):
    self.config['device_ip_addr'] = value

  def load_config(self):
    self.config = {}
    with open('config.txt', 'r') as file:
      self.config = json.load(file)
    self.config['device_ip_addr'] = (self.config['device_ip_addr']).strip()

  def save_config(self):
    with open('config.txt', 'w') as file:
      json.dump(self.config, file, indent=4, sort_keys=True)

  def set_config_param(self, key, value):
    self.config[key] = value
    self.save_config()

  def get_ssh(self, verbose = 0):
    if self.ssh:
      try:
        self.ssh.keepalive_send()
        return self.ssh
      except Exception:
        pass
    self.shutdown()
    try:
      self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
      self.socket.connect((self.ip_addr, self.ssh_port))
      self.ssh = ssh2.session.Session()
      self.ssh.handshake(self.socket)
      self.ssh.userauth_password('root', 'root')
      self.ssh.set_blocking(True)
      self.ssh.set_timeout(self.timeout * 1000);
      return self.ssh
    except Exception as e:
      #print(e)
      if verbose:
        die("SSH server not responding (IP: {})".format(self.ip_addr))
      self.shutdown()
    return None

  def get_telnet(self, verbose = 0):
    try:
      tn = telnetlib.Telnet(self.ip_addr)
      tn.read_until(b"login: ")
      tn.write(b"root\n")
      tn.read_until(b"Password: ")
      tn.write(b"root\n")
      tn.read_until(b"root@XiaoQiang:~#")
      return tn
    except Exception as e:
      #print(e)
      if verbose:
        die("TELNET not responding (IP: {})".format(self.ip_addr))
    return None

  def get_ftp(self, verbose = 0):
    if self.ftp and self.ftp.sock:
      try:
        self.ftp.voidcmd("NOOP")
        return self.ftp  #Already connected
      except Exception:
        pass
    self.shutdown()
    try:
      #timeout = 10 if self.timeout < 10 else self.timeout
      self.ftp = ftplib.FTP(self.ip_addr, user='root', passwd='root', timeout=self.timeout)
      self.ftp.voidcmd("NOOP")
      return self.ftp
    except Exception:
      if verbose:
        die("ftp not responding (IP: {})".format(self.ip_addr))
      self.shutdown()
    return None

  def ping(self, verbose = 2):
    if self.use_ssh:
      ssh = self.get_ssh(verbose)
      if not ssh:
        return False
    else:
      tn = self.get_telnet(verbose)
      if not tn:
        return False
      ftp = self.get_ftp(verbose)
      if not ftp:
        return False
    return True

  def run_cmd(self, cmd, msg = None):
    if self.use_ssh:
      ssh = self.get_ssh(self.verbose)
    else:
      tn = self.get_telnet(self.verbose)
    if (msg):
      print(msg)
    cmdlist = []
    if isinstance(cmd, str):      
      cmdlist.append(cmd)
    else:
      cmdlist = cmd
    for idx, cmd in enumerate(cmdlist):
      if self.use_ssh:
        channel = ssh.open_session()
        #channel.pty('xterm')
        #print("exec = '{}'".format(cmd))
        channel.execute(cmd)
        try:
          channel.wait_eof()
        except ssh2.exceptions.Timeout:
          die("SSH execute command timedout! CMD: \"{}\"".format(cmd))
        try:
          channel.close()
          channel.wait_closed()
        except Exception:
          pass
        #status = channel.get_exit_status()
      else:
        cmd = (cmd + '\n').encode('ascii')
        tn.write(cmd)
        tn.read_until(b"root@XiaoQiang:~#")
    if not self.use_ssh:
      tn.write(b"exit\n")
    return True

  def download(self, fn_remote, fn_local, verbose = 1):
    if self.use_ssh:
      ssh = self.get_ssh(self.verbose)
      channel, fileinfo = ssh.scp_recv2(fn_remote)
      total_size = fileinfo.st_size
      read_size = 0
      with open(fn_local, 'wb') as file:
        while read_size < total_size:
          size, data = channel.read()
          if size > 0:
            if read_size + len(data) > total_size:
              file.write(data[:total_size - read_size])
            else:
              file.write(data)
            read_size += size
    else:
      ftp = self.get_ftp(self.verbose)
      file = open(fn_local, 'wb')
      if verbose and self.verbose:
        print('Download file: "{}" ....'.format(fn_remote))
      ftp.retrbinary('RETR ' + fn_remote, file.write)
      file.close()
    return True

  def upload(self, fn_local, fn_remote, verbose = 1):
    try:
      file = open(fn_local, 'rb')
    except Exception:
      die('File "{}" not found.'.format(fn_local))
    if self.use_ssh:
      ssh = self.get_ssh(self.verbose)
      finfo = os.stat(fn_local)
      channel = ssh.scp_send64(fn_remote, finfo.st_mode & 0o777, finfo.st_size, finfo.st_mtime, finfo.st_atime)
      size = 0
      for data in file:
        channel.write(data)
        size = size + len(data)
      #except ssh2.exceptions.SCPProtocolError as e:
    else:
      ftp = self.get_ftp(self.verbose)
      if verbose and self.verbose:
        print('Upload file: "{}" ....'.format(fn_local))
      ftp.storbinary('STOR ' + fn_remote, file)
    file.close()
    return True


if __name__ == "__main__":
  if len(sys.argv) > 1:
    ip_addr = sys.argv[1]
    gw = Gateway(detect_device = False)
    gw.ip_addr = ip_addr
    gw.save_config()
    print("Device IP-address changed to {}".format(ip_addr))