Python腳本--端口掃描器

一個用python寫的簡單的端口掃描器，python環境爲 3.7.0，windows系統

掃描給定主機是否開放了指定的端口
TCP連接掃描是利用TCP的三次握手來確定主機的端口是否開放。確定主機端口開放之後，給端口發送消息，接收端口返回的消息，然後判斷該端口運行的服務。
使用時，-H 參數可以提供主機的域名或者ip地址，-p/-P 寫要掃描的端口，多個端口用逗號分隔

'''
@Author:yw
參考書籍:《python絕技：運用python成爲頂級***》
'''
import optparse
from socket import *
import threading
threadlock = threading.Lock() #實例化threadlock對象

def Conn_scan(Host, Port):
    try:
        conn = socket(AF_INET,SOCK_STREAM)
        conn.connect((Host, Port))
        #conn.send('ywboy'.encode('utf-8')) #發送測試
        #results = conn.recv(100)           #接收主機返回的信息
        threadlock.acquire()                 #加鎖
        print("[+]%d/tcp Open" % Port)
        #print('[+]'+results.decode('utf-8'))
        conn.close()
    except Exception as e:
        threadlock.acquire()                 #釋放鎖
        print('[-]%d/Tcp Closed' % Port)
    finally:
        threadlock.release()
        conn.close()
def Port_scan(Host, Ports):
    try:
        IP = gethostbyname(Host)        ##獲得對應主機的ip地址
    except:
        print("[-] Cannot resolve '%s':Unknow host" % Host)
        return
    try:
        Name = gethostbyaddr(Host)          ##獲得對應主機的信息,返回主機名、主機別名列表、主機IP地址列表
        print("\n[+] Scan result for:"+Name[0])
    except:
        print("\n[+] Scan Results for:"+IP)
    setdefaulttimeout(1)
    for Port in Ports:
        print("Scan port:"+Port)
        Conn_scan(Host, int(Port))
def main():
    usage = "usage %prog -H <target Host> -p/-P <target ports>"
    parse = optparse.OptionParser(usage)
    parse.add_option('-H', dest='Host', type='string', help='target Host')
    parse.add_option('-p','-P', dest='Ports', type='string', help='SCan Port')
    (options, args) = parse.parse_args()
    Host = options.Host
    Ports = str(options.Ports).split(',')
    if (Host==None)|(Ports==None):
        print(parse.usage)
        exit(0)
    Port_scan(Host,Ports)
if __name__ == '__main__':
    main()

上述代碼，因爲我只是做了端口掃描，所以註釋掉的判斷端口掃描服務的代碼

運行結果：