Python code example to implement port scanner

This article mainly introduces the relevant code for implementing a simple port scanner in Python. It has certain reference value. Interested friends can refer to it.

Based on some information on the Internet, I have added some new content, which can be regarded as a practice in Python socket programming.

#coding=utf-8
import socket
import time
import sys
import struct
import threading
from threading import Thread,activeCount

results=[]
def portScanner(ip,port):
  server = (ip,port)
  sockfd = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
  sockfd.settimeout(0.1)     #设置阻塞模式下socket的超时时间
  ret = sockfd.connect_ex(server) #成功返回0，失败返回error的值。
  if not ret:
    sockfd.close()
    results.append([ip,port])
    #print '%s:%s is opened...' % (ip,port)
  else:
    sockfd.close()
    pass
  return ''
  

def ip2num(ip):     #将ip地址转换成数字
  lp = [int(x) for x in ip.split('.')]
  return lp[0] << 24 | lp[1] << 16 | lp[2] << 8 |lp[3]

def num2ip(num):
  ip = [&#39;&#39;,&#39;&#39;,&#39;&#39;,&#39;&#39;]
  ip[3] = (num & 0xff)
  ip[2] = (num & 0xff00) >> 8
  ip[1] = (num & 0xff0000) >> 16
  ip[0] = (num & 0xff000000) >> 24
  return &#39;%s.%s.%s.%s&#39; % (ip[0],ip[1],ip[2],ip[3])

def iprange(ip1,ip2):
  num1 =socket.ntohl(struct.unpack("I",socket.inet_aton(str(ip1)))[0])
  num2 =socket.ntohl(struct.unpack("I",socket.inet_aton(str(ip2)))[0])
  tmp = num2 - num1
  if tmp < 0:
    return None
  else:
    return num1,num2,tmp


if name == &#39;main&#39;:

  if((len(sys.argv)!= 4)&(len(sys.argv)!= 2)):  #用法说明
    print &#39;Usage:\n\tscanner.py startip endip port&#39;
    print &#39;\tscanner.py ip&#39;
    sys.exit()

  if len(sys.argv)==4:      #对某一IP段的扫描
    time_start=time.time()    #起始时间
    startip = sys.argv[1]    #起始IP
    endip = sys.argv[2]      #结束IP
    port = int(sys.argv[3])    #端口号

    res = iprange(startip,endip)
    if not res:
      print &#39;endip must be bigger than startone&#39;
      sys.exit()
    elif res[2] == 0:
      portScanner(startip,port)
    else:
      for x in xrange(int(res[2])+1):    #IP地址依次递增
        startipnum = ip2num(startip)
        startipnum = startipnum + x
        if activeCount() <=1000:           
          Thread(target=portScanner,args=(num2ip(startipnum),port)).start()
        
    print "There are %d hosts." %len(results)
    results.sort()
    for ip,port in results:
      print "%s:%d is opened..." %(ip,port)
    times=time.time()-time_start      #用时
    print &#39;use time : %s&#39; % times
        
  if len(sys.argv)==2:
    time_start=time.time()
    port=0
    ip=sys.argv[1]
    while(port<2000):
      if activeCount() <= 40:   #设置40线程扫描
        Thread(target = portScanner, args = (ip, port)).start()
        port=port+1
    results.sort()
    for ip,port in results:
      print "%s:%d is opened..." %(ip,port)
    times=time.time()-time_start
    print &#39;use time : %s&#39; % times

The usage effect is as follows:

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