#!/usr/bin/python3
# coding=utf-8

"""
OneForAll subdomain takeover module

:copyright: Copyright (c) 2019, Jing Ling. All rights reserved.
:license: GNU General Public License v3.0, see LICENSE for more details.
"""
import time
import json
from threading import Thread
from queue import Queue

import fire
from common.tablib.tablib import Dataset
from tqdm import tqdm

from config.log import logger
from config import settings
from common import utils
from common.module import Module


def get_fingerprint():
    path = settings.data_storage_dir.joinpath('fingerprints.json')
    with open(path, encoding='utf-8', errors='ignore') as file:
        fingerprints = json.load(file)
    return fingerprints


def get_cname(subdomain):
    resolver = utils.dns_resolver()
    try:
        answers = resolver.query(subdomain, 'CNAME')
    except Exception as e:
        logger.log('TRACE', e.args)
        return None
    for answer in answers:
        return answer.to_text()  # 一个子域只有一个CNAME记录


class Takeover(Module):
    """
    OneForAll subdomain takeover module

    Example:
        python3 takeover.py --target www.example.com  --fmt csv run
        python3 takeover.py --targets ./subdomains.txt --thread 10 run

    Note:
        --fmt txt/csv/json (result format)
        --path   Result directory (default directory is ./results)

    :param str target:   One domain (target or targets must be provided)
    :param str targets:  File path of one domain per line
    :param int thread:   threads number (default 20)
    :param str fmt:      Result format (default csv)
    :param str path:     Result directory (default None)
    """

    def __init__(self, target=None, targets=None, thread=20, path=None, fmt='csv'):
        Module.__init__(self)
        self.subdomains = set()
        self.module = 'Check'
        self.source = 'Takeover'
        self.target = target
        self.targets = targets
        self.thread = thread
        self.path = path
        self.fmt = fmt
        self.fingerprints = None
        self.queue = Queue()  # subdomain queue
        self.cnames = list()
        self.results = Dataset()

    def save(self):
        logger.log('DEBUG', 'Saving results')
        if self.fmt == 'txt':
            data = str(self.results)
        else:
            data = self.results.export(self.fmt)
        utils.save_to_file(self.path, data)

    def compare(self, subdomain, cname, responses):
        domain_resp = self.get('http://' + subdomain, check=False, ignore=True)
        cname_resp = self.get('http://' + cname, check=False, ignore=True)
        if domain_resp is None or cname_resp is None:
            return

        for resp in responses:
            if resp in domain_resp.text and resp in cname_resp.text:
                logger.log('ALERT', f'{subdomain} takeover threat found')
                self.results.append([subdomain, cname])
                break

    def worker(self, subdomain):
        cname = get_cname(subdomain)
        if cname is None:
            return
        main_domain = utils.get_main_domain(cname)
        for fingerprint in self.fingerprints:
            cnames = fingerprint.get('cname')
            if main_domain not in cnames:
                continue
            responses = fingerprint.get('response')
            self.compare(subdomain, cname, responses)

    def check(self):
        while not self.queue.empty():  # 保证域名队列遍历结束后能退出线程
            subdomain = self.queue.get()  # 从队列中获取域名
            self.worker(subdomain)
            self.queue.task_done()

    def progress(self):
        bar = tqdm()
        bar.total = len(self.subdomains)
        bar.desc = 'Check Progress'
        bar.ncols = 80
        while True:
            done = bar.total - self.queue.qsize()
            bar.n = done
            bar.update()
            if done == bar.total:  # 完成队列中所有子域的检查退出
                break

    def run(self):
        start = time.time()
        logger.log('INFOR', f'Start running {self.source} module')
        if isinstance(self.targets, set):
            self.subdomains = self.targets
        else:
            self.subdomains = utils.get_domains(self.target, self.targets)
        self.fmt = utils.check_format(self.fmt)
        timestamp = utils.get_timestamp()
        name = f'takeover_check_result_{timestamp}'
        self.path = utils.check_path(self.path, name, self.fmt)
        if self.subdomains:
            logger.log('INFOR', f'Checking subdomain takeover')
            self.fingerprints = get_fingerprint()
            self.results.headers = ['subdomain', 'cname']
            # 创建待检查的子域队列
            for domain in self.subdomains:
                self.queue.put(domain)
            # 进度线程
            progress_thread = Thread(target=self.progress, name='ProgressThread',
                                     daemon=True)
            progress_thread.start()
            # 检查线程
            for i in range(self.thread):
                check_thread = Thread(target=self.check, name=f'CheckThread{i}',
                                      daemon=True)
                check_thread.start()

            self.queue.join()
            self.save()
        else:
            logger.log('FATAL', f'Failed to obtain domain')
        end = time.time()
        elapse = round(end - start, 1)
        logger.log('ALERT', f'{self.source} module takes {elapse} seconds, '
                            f'There are {len(self.results)} subdomains exists takeover')
        logger.log('INFOR', f'Subdomain takeover results: {self.path}')
        logger.log('INFOR', f'Finished {self.source} module')


if __name__ == '__main__':
    fire.Fire(Takeover)