求大神帮解答

import socket
def retBanner(ip,port):
    try:
        socket.setdefaulttimeout(2)
        s = socket.socket()
        s.connect((ip.port))
        benner = s,recv(1024)
        return banner
    except:
        return
def checkVulns(banner):
    if 'FreeFloat Ftp server(version 1.00)' in banner:
        print '[+] FreeFloat Ftp server is vulnerable.'
    elif '3Com 3CDaemon Ftp server version 2.0' in banner:
        print '[+] 3CDaemon Ftp server is vulnerable.'
    elif '[+] Ability server 2.34' in banner:
        print '[+] Ability Ftp serveris vulnerable.'
    elif 'Sami Ftp server 2.0.2' in banner:
        print '[+] Sami Ftp server is vulnerable.'
    else:
        print '[-] Ftp Server is not vulnerable.'
    return

def main():
    portList = [21,22,25,80,110,3389]
    for x in range(1,255):
        ip = '192.168.1.' + str(x)
        for port in portList:
            banner = retBanner(ip,port)
            if banner:
                print '[+] ' + ip +': '+ banner
                checkVulns(banner)
if __name__ == '__main__':
    main()

为什么不能输出东西呢

兄弟，你发错地方了吧，Python在另外一个版块吧，版块我移动下~

端口没开放嘛
你加个else print 把扫描到的不开放的IP也显示