for循環中的線程在Python 3

Question

運行一次，我寫了一個Python腳本來獲取IP地址的列表的證書相匹配的域：

#! /usr/bin/env python3 

import ssl 
import socket 
import argparse 
from threading import Thread, Lock 
from itertools import islice 

class scanThread(Thread): 
    def __init__(self,iplist, q, hostname, port): 
     Thread.__init__(self) 
     self.iplist = iplist 
     self.hostname = hostname 
     self.port = port 
     self.queue = q 

    def dummy(self,ip): 
     print("Running dummy") 

    def checkCert(self, ip): 
     print('Processing IP: %s' % ip) 
     ctx = ssl.create_default_context() 
     s = ctx.wrap_socket(socket.socket(), server_hostname=self.hostname) 
     try: 
      s.connect((ip, self.port)) 
      cert = s.getpeercert() 
      if cert['subjectAltName'][0][1].find(hostname) != -1: 
       return ip 
     except (ssl.CertificateError, ssl.SSLError): 
      print('Ignore: %s' % ip) 
     finally: 
      s.close() 
      return 

    def run(self): 
     for ip in self.iplist: 
      returnIP = self.checkCert(ip) 
      if returnIP: 
       self.queue.append(ip) 

def main(l, hostname, port): 
    iplist = [] 
    threads = [] 
    hostPool = [] 
    with open(l,'r') as f: 
     #while True: 
     iplist.extend([f.readline().strip() for x in islice(f, 10000)]) 
     #print(iplist) 
     t = scanThread(iplist, hostPool, hostname, port) 
     t.start() 
     threads.append(t) 
     iplist.clear() 

    for t in threads: 
     t.join() 

    for h in hostPool: 
     print(h) 




if __name__ == '__main__': 
    parser = argparse.ArgumentParser() 
    parser.add_argument("hostname",help="root hostname") 
    parser.add_argument("-l","--list",required=True, help="IP list for scanning") 
    parser.add_argument("-p","--port", nargs='?', const=443, default=443, type=int, help="port to scan") 
    arg = parser.parse_args() 
    main(arg.list,arg.hostname, arg.port) 

我只是註釋掉while迴路main功能，因此該腳本創建一個線程並掃描10,000個IP。

以 'google.com' 爲例，它擁有衆多的IP地址全世界：

./google.py -l 443.txt google.com 

輸出示例：

Processing IP: 13.76.139.89 
Ignore: 13.76.139.89 

一些測試後，我敢肯定的是，for ... in環在scanThread.run()執行一次。我在這段代碼中做了不適當的事嗎？

Answer 1

這可能是因爲您正在清除主函數中的列表。

t = scanThread(iplist, hostPool, hostname, port) 
    t.start() 
    threads.append(t) 
    iplist.clear() // here you are clearing. 

你可以嘗試：

class scanThread(Thread): 
    def __init__(self,iplist, q, hostname, port): 
     Thread.__init__(self) 
     self.iplist = list(iplist) 

self.iplist = list(iplist)這是榜上無名的副本，而不是用它傳遞的列表。