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"""DNS Message Flags.""" |
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import enum |
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from typing import Any |
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class Flag(enum.IntFlag): |
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QR = 0x8000 |
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AA = 0x0400 |
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TC = 0x0200 |
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RD = 0x0100 |
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RA = 0x0080 |
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AD = 0x0020 |
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CD = 0x0010 |
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class EDNSFlag(enum.IntFlag): |
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DO = 0x8000 |
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def _from_text(text: str, enum_class: Any) -> int: |
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flags = 0 |
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tokens = text.split() |
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for t in tokens: |
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flags |= enum_class[t.upper()] |
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return flags |
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def _to_text(flags: int, enum_class: Any) -> str: |
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text_flags = [] |
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for k, v in enum_class.__members__.items(): |
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if flags & v != 0: |
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text_flags.append(k) |
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return " ".join(text_flags) |
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def from_text(text: str) -> int: |
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"""Convert a space-separated list of flag text values into a flags |
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value. |
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Returns an ``int`` |
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""" |
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return _from_text(text, Flag) |
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def to_text(flags: int) -> str: |
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"""Convert a flags value into a space-separated list of flag text |
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values. |
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Returns a ``str``. |
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""" |
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return _to_text(flags, Flag) |
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def edns_from_text(text: str) -> int: |
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"""Convert a space-separated list of EDNS flag text values into a EDNS |
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flags value. |
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Returns an ``int`` |
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""" |
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return _from_text(text, EDNSFlag) |
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def edns_to_text(flags: int) -> str: |
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"""Convert an EDNS flags value into a space-separated list of EDNS flag |
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text values. |
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Returns a ``str``. |
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""" |
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return _to_text(flags, EDNSFlag) |
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QR = Flag.QR |
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AA = Flag.AA |
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TC = Flag.TC |
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RD = Flag.RD |
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RA = Flag.RA |
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AD = Flag.AD |
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CD = Flag.CD |
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DO = EDNSFlag.DO |
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