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69 lines
2.3 KiB
Python
69 lines
2.3 KiB
Python
#!/usr/bin/python3
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# Generate DNS RR type constants for resolv header files.
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# Copyright (C) 2016-2017 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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#
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <http://www.gnu.org/licenses/>.
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"""Generate DNS RR type constants for resolv header files.
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resolv/arpa/nameser.h and resolv/arpa/nameser_compat.h contain lists
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of RR type constants. This script downloads the current definitions
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from the IANA DNS Parameters protocol registry and translates it into
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the two different lists.
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Two lists are written to standard output. The first one contains enum
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constants for resolv/arpa/nameser.h. The second one lists the
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preprocessor macros for resolv/arpa/nameser_compat.h.
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"""
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# URL of the IANA registry.
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source = "http://www.iana.org/assignments/dns-parameters/dns-parameters-4.csv"
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import collections
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import csv
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import io
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import urllib.request
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Type = collections.namedtuple("Type", "name number comment")
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def get_types(source):
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for row in csv.reader(io.TextIOWrapper(urllib.request.urlopen(source))):
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if row[0] in ('TYPE', 'Unassigned', 'Private use', 'Reserved'):
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continue
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name, number, comment = row[:3]
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if name == '*':
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name = 'ANY'
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comment = 'request for all cached records'
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number = int(number)
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yield Type(name, number, comment)
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types = list(get_types(source))
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print("// enum constants for resolv/arpa/nameser.h")
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print()
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for typ in types:
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name = typ.name.replace("-", "_").lower()
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print(" ns_t_{0} = {1.number},".format(name, typ))
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print()
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print("// macro aliases resolv/arpa/nameser_compat.h")
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print()
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for typ in types:
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name = typ.name.replace("-", "_")
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print("#define T_{0} ns_t_{1}".format(name.upper(), name.lower()))
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print()
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