Python实现简易端口扫描器代码实例

 #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 = ['','','',''] ip[3] = (num & 0xff) ip[2] = (num & 0xff00) >> 8 ip[1] = (num & 0xff0000) >> 16 ip[0] = (num & 0xff000000) >> 24 return '%s.%s.%s.%s' % (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: num1,num2,tmp if __name__== '__main__': if((len(sys.argv)!=4)&(len(sys.argv)!= 2)): #用法说明 print 'usage:\n\tscanner.py startip endip port' '\tscanner.py ip' sys.exit() len(sys.argv)==4: #对某一ip段的扫描 time_start=time.time() #起始时间 sys.argv[1] #起始ip sys.argv[2] #结束ip port=int(sys.argv[3]) #端口号 res=iprange(startip,endip) not res: 'endip must be bigger than startone' elif res[2]== 0: portscanner(startip,port) for x in xrange(int(res[2])+1): #ip地址依次递增 startipnum + activecount() < thread(target=portScanner,args=(num2ip(startipnum),port)).start() "there are %d hosts." %len(results) results.sort() ip,port results: "%s:%d is opened..." %(ip,port) times #用时 'use time : %s' % ip=sys.argv[1] while(port<2000): 40: #设置40线程扫描 portscanner, args=(ip, port)).start() pre>