Python(파이썬)으로 Port Scan (포트 스캔)

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from socket import * from threading import Thread import re import time   global ThreadCnt ThreadCnt = 0 PortList = {20:'FTP', 21:'FTP', 22:'SSH', 23:'Telnet', 24:'mail', 25:'SMTP', 80:'HTTP', 443:'HTTPS',  3306:'MySQL',}   def ConnScan(Target_Host, Target_Port):     try:         connskt = socket(AF_INET, SOCK_STREAM)         connskt.connect((Target_Host, Target_Port))         connskt.send('hello')         result = connskt.recv(1024)         file_result = open('result.txt','a')         file_result.write( '[' + PortList[Target_Port] + ']' + '[' + str(Target_Port) + ']' + Target_Host + '\n')         file_result.close()         connskt.close()          except:         pass           global ThreadCnt     ThreadCnt -= 1        def PortScan(Target_Host, Target_Port):     global ThreadCnt     for ip in Target_Host:         print 'Scanning : ' + ip         #print str(ThreadCnt)         for port in Target_Port:             while True :                 if ThreadCnt > 500  :                     continue                 t = Thread (target=ConnScan, args=(ip, port))                 ThreadCnt +=1                 t.start()                 break                                        def main():     file = open("iplist.txt", "r")     Target_Host = []     Target_Port = PortList.keys()     cnt = 0     for text in file.readlines():         text = text.rstrip()         regex = re.findall(r'(?:[\d]{1,3})\.(?:[\d]{1,3})\.(?:[\d]{1,3})\.(?:[\d]{1,3})$', text)         if regex is not None and regex not in Target_Host:             cnt += 1             Target_Host.append("".join(regex))                     print Target_Host        PortScan(Target_Host, Target_Port)    if __name__ == '__main__':     main()