scan.py 文件源码

def single_host(ip):
    try:
        socket.inet_aton(ip)
    except socket.error:
        return 'Error: Invalid IP address.'

    results = ''

    for p in PORTS:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        c = s.connect_ex((ip, p))
        socket.setdefaulttimeout(0.5)

        state = 'open' if not c else 'closed'

        results += '{:>5}/tcp {:>7}\n'.format(p, state)

    return results.rstrip()