用python写的扫描器

# coding=UTF-8

import optparse
import socket
import threading

screenLock = threading.Semaphore(value=1)

def connScan(tgtHost, tgtPort):

    try:
        connSkt = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        connSkt.connect((tgtHost, tgtPort))
        connSkt.send('ViolentPython\r\n')

        results = connSkt.recv(100)
        screenLock.acquire()

        print('[+]%d/tcp open' %tgtPort)
        print('[+]' + str(results))
    except:
        screenLock.acquire()
        print('[-]%d/tcp closed' %tgtPort)
    finally:
        screenLock.release()
        connSkt.close()

def portScan(tgtHost,tgtPorts):
    try:
        tgtIP = socket.gethostbyname(tgtHost)
    except:
        print("[-] Cannot resolve '%s': Unknown host" %tgtHost)
        return
    try:
        tgtName = socket.gethostbyaddr(tgtIP)
        print('\n[+]Scan Results for:' + tgtName[0])
    except:
        print('\n[+]Scan Results for:' + tgtIP)
    socket.setdefaulttimeout(1)
    for tgtPort in tgtPorts:
        print('Scanning port' + str(tgtPort))
        t = threading.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='int', help='specify target port')
    (options, args) = parser.parse_args()
    tgtHost = options.tgtHost
    tgtPort = options.tgtPort
    if (tgtHost == None) | (tgtPort == None):
        print('[-]You must specify a target host and port[s]!')
        exit(0)
    portScan(tgtHost, args)


if __name__ == '__main__':
    main()

 

 目前还在研究模块用法

（待修改）