python编写的简单端口扫描器

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python3下 运行成功

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# coding=utf-8

import socket
import optparse


def connScan(tgtHost, tgtPort):
    try:
        connSkt = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        connSkt.connect((tgtHost, tgtPort))
        print("[+]%d/tcp open" % tgtPort)
        connSkt.close()
    except:
        print("[-]%d/tcp close" % tgtPort)


def portScan(tgtHost):
    try:
        tgtIP = socket.gethostbyname(tgtHost)
    except:
        print("[-]cannot connect %s" % tgtIP)
        return
    try:
        tgtName = socket.gethostbyaddr(tgtIP)
        print("\n[+]Scan results for:" + tgtName[0])
    except:
        print("\n[+]scan results for:" + tgtIP)
        socket.setdefaulttimeout(1)
        for port in range(80, 90):
            print("scanning port:" + str(port))
            connScan(tgtHost, int(port))


def main():
    parser = optparse.OptionParser()
    parser.add_option("-H", "--Host", dest='tgtHost', help='input Host address')
    (options, args) = parser.parse_args()
    tgtHost = options.tgtHost
    if (tgtHost == None):
        print('----you must input Host-----')
        exit(0)
    portScan(tgtHost)


if __name__ == '__main__':
    main()