Question

我正在尝试创建一个python脚本来检查端口是否可用。下面是一段代码（不是总脚本）。

但是当我运行脚本时终端显示没有输出，当我按下ctrl + c我得到一个脚本的结果，当我再次按ctrl + c时我得到第二个结果。当脚本完成后，它最终退出...

#!/usr/bin/python

import re
import socket
from itertools import islice

resultslocation = '/tmp/'
f2name = 'positives.txt'
f3name = 'ip_addresses.txt'
f4name = 'common_ports.txt'

#Trim down the positive results to only the IP addresses and scan them with the given ports in the common_ports.txt file

with open(resultslocation + f2name, 'r') as f2, open(resultslocation + f3name, 'w') as f3:
    hits = f2.read()
    list = re.findall(r'name = (.+).', hits)
    for items in list:
        ip_addresses = socket.gethostbyname(items)
        with open(resultslocation + f4name, 'r') as f4:
            for items in f4:
                ports = int(items)
                s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
                try:
                    s.connect((ip_addresses, ports))
                    s.shutdown(2)
                    print 'port', ports, 'on', ip_addresses, 'is open'
                except:
                    print 'port', ports, 'on', ip_addresses, 'is closed'

我做错了什么？

提前致谢！

Answer 1

默认情况下，套接字是以阻止模式创建的。

因此，一般情况下，建议在调用settimeout()之前调用connect()或将超时参数传递给create_connection()并使用它而不是连接。由于您的代码已经捕获了异常，因此第一个选项很容易实现;

with open(resultslocation + f2name, 'r') as f2, open(resultslocation + f3name, 'w') as f3:
    hits = f2.read()
    list = re.findall(r'name = (.+).', hits)
    for items in list:
        ip_addresses = socket.gethostbyname(items)
        with open(resultslocation + f4name, 'r') as f4:
            for items in f4:
                ports = int(items)
                s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
                s.settimeout(1.0) # Set a timeout (value in seconds).
                try:
                    s.connect((ip_addresses, ports))
                    s.shutdown(2)
                    print 'port', ports, 'on', ip_addresses, 'is open'
                except:
                    # This will alse catch the timeout exception.
                    print 'port', ports, 'on', ip_addresses, 'is closed'

Python：必须按ctrl + c才能得到结果

1 个答案: