Python3多线程版TCP端口扫描器

python BannerDemo.py -H 192.168.200.101 -p 22,3306

import optparseimport socketfrom socket import *from threading import *screenLock = Semaphore(value=1)def connScan(tgtHost,tgtPort):  try:    connSkt = socket(AF_INET,SOCK_STREAM)    connSkt.connect((tgtHost,tgtPort))    connSkt.send('ViolentPython/r/n'.encode('utf-8'))    result = connSkt.recv(1024)    screenLock.acquire()    print("[+] %d/tcp open"%tgtPort)    print("[+]"+str(result))  except Exception as e:    screenLock.acquire()    print(e)  finally:    screenLock.release()    connSkt.close()def portScan(tgtHost,tgtPorts):  try:    tgtIp = gethostbyname(tgtHost)  except:    print("[-] Cannot reslove '%s' : Unknown host" % tgtHost)    return  try:    tgtName = gethostbyaddr(tgtIp)    print("/n [+] Scan Result for: " + tgtName[0])  except:    print("/n [+] Scan Result for: " + tgtIp)  setdefaulttimeout(1)  for tgtPort in tgtPorts:    print("Scanning port "+ tgtPort)    t = Thread(target=connScan,args=(tgtHost,int(tgtPort)))    t.start()def main():  parser = optparse.OptionParser("usage%prog -H <target host> -p <target port>")  parser.add_option('-H',dest='tgtHost',type='string',help='specify target host')  parser.add_option('-p',dest='tgtPort',type='string',help='specify target port[s] separated by comma')  options,args = parser.parse_args()  tgtHost = options.tgtHost  tgtPorts = str(options.tgtPort).split(',')  if(tgtHost == None or tgtPorts[0] == None):    print("[-] You must specify a target host and port[s]")    exit(0)  portScan(tgtHost,tgtPorts)if __name__ == '__main__':  main()