portscan python实现

学习笔记,在学python写一写一些小工具,最近玩的有点疯,从四川到辽宁,白天和朋友出去玩,晚上回来看看一节书。零散的时间看看公众号,读一读rss订阅的博客,时间过得好快啊。

常见的通过socket套接字发送数据包,来判断端口是否开启,并接受返回包来显示banner信息。

引入了线程,通过信号量,将线程加锁。使得输出有序。

源码:

import optparse
import socket
from 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('HeLLo 123456789qwertyu \r\n')
        results = connSkt.recv(4096)
        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 = gethostbyname(tgtHost)
    except:
        print "[-] Cannoot resolve '%s': Unknow host"% tgtHost
        return
    try:
        tgtName = gethostbyaddr(tgtIP)
        print '\n [+] Scan Results for : '+ tgtName[0]
    except:
        print '\n [+] Scan Results for : '+ tgtIP
    setdefaulttimeout(1)
    for tgtPort in tgtPorts:
        t = Thread(target=connScan, args=(tgtHost, int(tgtPort)))
        t.start()
def main():
    parser = optparse.OptionParser('usage -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) | (tgtPorts[0] == None):
        print parser.usage
        print '[-] You must specify a target host and port[s].'
        exit(0)
    portScan(tgtHost, tgtPorts)
if __name__ == '__main__':
    main()

 

 

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