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"""DNS Result Codes.""" |
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from typing import Tuple |
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import dns.enum |
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import dns.exception |
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class Rcode(dns.enum.IntEnum): |
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NOERROR = 0 |
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FORMERR = 1 |
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SERVFAIL = 2 |
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NXDOMAIN = 3 |
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NOTIMP = 4 |
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REFUSED = 5 |
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YXDOMAIN = 6 |
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YXRRSET = 7 |
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NXRRSET = 8 |
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NOTAUTH = 9 |
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NOTZONE = 10 |
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DSOTYPENI = 11 |
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BADVERS = 16 |
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BADSIG = 16 |
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BADKEY = 17 |
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BADTIME = 18 |
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BADMODE = 19 |
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BADNAME = 20 |
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BADALG = 21 |
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BADTRUNC = 22 |
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BADCOOKIE = 23 |
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@classmethod |
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def _maximum(cls): |
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return 4095 |
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@classmethod |
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def _unknown_exception_class(cls): |
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return UnknownRcode |
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class UnknownRcode(dns.exception.DNSException): |
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"""A DNS rcode is unknown.""" |
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def from_text(text: str) -> Rcode: |
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"""Convert text into an rcode. |
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*text*, a ``str``, the textual rcode or an integer in textual form. |
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Raises ``dns.rcode.UnknownRcode`` if the rcode mnemonic is unknown. |
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Returns a ``dns.rcode.Rcode``. |
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""" |
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return Rcode.from_text(text) |
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def from_flags(flags: int, ednsflags: int) -> Rcode: |
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"""Return the rcode value encoded by flags and ednsflags. |
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*flags*, an ``int``, the DNS flags field. |
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*ednsflags*, an ``int``, the EDNS flags field. |
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Raises ``ValueError`` if rcode is < 0 or > 4095 |
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Returns a ``dns.rcode.Rcode``. |
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""" |
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value = (flags & 0x000F) | ((ednsflags >> 20) & 0xFF0) |
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return Rcode.make(value) |
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def to_flags(value: Rcode) -> Tuple[int, int]: |
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"""Return a (flags, ednsflags) tuple which encodes the rcode. |
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*value*, a ``dns.rcode.Rcode``, the rcode. |
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Raises ``ValueError`` if rcode is < 0 or > 4095. |
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Returns an ``(int, int)`` tuple. |
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""" |
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if value < 0 or value > 4095: |
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raise ValueError("rcode must be >= 0 and <= 4095") |
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v = value & 0xF |
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ev = (value & 0xFF0) << 20 |
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return (v, ev) |
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def to_text(value: Rcode, tsig: bool = False) -> str: |
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"""Convert rcode into text. |
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*value*, a ``dns.rcode.Rcode``, the rcode. |
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Raises ``ValueError`` if rcode is < 0 or > 4095. |
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Returns a ``str``. |
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""" |
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if tsig and value == Rcode.BADVERS: |
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return "BADSIG" |
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return Rcode.to_text(value) |
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NOERROR = Rcode.NOERROR |
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FORMERR = Rcode.FORMERR |
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SERVFAIL = Rcode.SERVFAIL |
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NXDOMAIN = Rcode.NXDOMAIN |
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NOTIMP = Rcode.NOTIMP |
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REFUSED = Rcode.REFUSED |
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YXDOMAIN = Rcode.YXDOMAIN |
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YXRRSET = Rcode.YXRRSET |
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NXRRSET = Rcode.NXRRSET |
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NOTAUTH = Rcode.NOTAUTH |
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NOTZONE = Rcode.NOTZONE |
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DSOTYPENI = Rcode.DSOTYPENI |
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BADVERS = Rcode.BADVERS |
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BADSIG = Rcode.BADSIG |
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BADKEY = Rcode.BADKEY |
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BADTIME = Rcode.BADTIME |
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BADMODE = Rcode.BADMODE |
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BADNAME = Rcode.BADNAME |
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BADALG = Rcode.BADALG |
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BADTRUNC = Rcode.BADTRUNC |
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BADCOOKIE = Rcode.BADCOOKIE |
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