encoding.py 文件源码

def dnshostencode(data, zone):
    """
    encodes the data in a DNS transmittable hostname, 0-9A-F
    :param data: DNS transmittable hostname data
    :param zone: DNS zone to add at the end
    :return: encoded form
    """

    # TODO: sending 0-9A-Z would be better

    res = b""
    sdata = base64.b16encode(data)

    # every 60 characters, we will add a dot
    for i in range(len(sdata)):
        res += sdata[i:i+1]
        if (i+1) % 60 == 0 and (i+1) < len(sdata):
            res += b'.'

    return res + b'.' + zone.encode('utf-8') + b'.'