Updated script that can be controled by Nodejs web app
This commit is contained in:
mac OS
708
lib/python3.13/site-packages/dns/tokenizer.py
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708
lib/python3.13/site-packages/dns/tokenizer.py
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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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# Copyright (C) 2003-2017 Nominum, Inc.
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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"""Tokenize DNS zone file format"""
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import io
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import sys
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from typing import Any, List, Optional, Tuple
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import dns.exception
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import dns.name
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import dns.ttl
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_DELIMITERS = {" ", "\t", "\n", ";", "(", ")", '"'}
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_QUOTING_DELIMITERS = {'"'}
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EOF = 0
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EOL = 1
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WHITESPACE = 2
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IDENTIFIER = 3
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QUOTED_STRING = 4
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COMMENT = 5
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DELIMITER = 6
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class UngetBufferFull(dns.exception.DNSException):
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"""An attempt was made to unget a token when the unget buffer was full."""
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class Token:
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"""A DNS zone file format token.
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ttype: The token type
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value: The token value
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has_escape: Does the token value contain escapes?
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"""
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def __init__(
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self,
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ttype: int,
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value: Any = "",
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has_escape: bool = False,
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comment: Optional[str] = None,
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):
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"""Initialize a token instance."""
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self.ttype = ttype
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self.value = value
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self.has_escape = has_escape
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self.comment = comment
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def is_eof(self) -> bool:
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return self.ttype == EOF
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def is_eol(self) -> bool:
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return self.ttype == EOL
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def is_whitespace(self) -> bool:
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return self.ttype == WHITESPACE
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def is_identifier(self) -> bool:
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return self.ttype == IDENTIFIER
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def is_quoted_string(self) -> bool:
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return self.ttype == QUOTED_STRING
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def is_comment(self) -> bool:
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return self.ttype == COMMENT
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def is_delimiter(self) -> bool: # pragma: no cover (we don't return delimiters yet)
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return self.ttype == DELIMITER
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def is_eol_or_eof(self) -> bool:
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return self.ttype == EOL or self.ttype == EOF
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def __eq__(self, other):
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if not isinstance(other, Token):
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return False
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return self.ttype == other.ttype and self.value == other.value
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def __ne__(self, other):
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if not isinstance(other, Token):
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return True
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return self.ttype != other.ttype or self.value != other.value
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def __str__(self):
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return '%d "%s"' % (self.ttype, self.value)
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def unescape(self) -> "Token":
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if not self.has_escape:
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return self
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unescaped = ""
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l = len(self.value)
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i = 0
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while i < l:
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c = self.value[i]
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i += 1
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if c == "\\":
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if i >= l: # pragma: no cover (can't happen via get())
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raise dns.exception.UnexpectedEnd
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c = self.value[i]
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i += 1
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if c.isdigit():
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if i >= l:
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raise dns.exception.UnexpectedEnd
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c2 = self.value[i]
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i += 1
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if i >= l:
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raise dns.exception.UnexpectedEnd
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c3 = self.value[i]
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i += 1
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if not (c2.isdigit() and c3.isdigit()):
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raise dns.exception.SyntaxError
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codepoint = int(c) * 100 + int(c2) * 10 + int(c3)
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if codepoint > 255:
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raise dns.exception.SyntaxError
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c = chr(codepoint)
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unescaped += c
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return Token(self.ttype, unescaped)
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def unescape_to_bytes(self) -> "Token":
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# We used to use unescape() for TXT-like records, but this
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# caused problems as we'd process DNS escapes into Unicode code
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# points instead of byte values, and then a to_text() of the
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# processed data would not equal the original input. For
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# example, \226 in the TXT record would have a to_text() of
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# \195\162 because we applied UTF-8 encoding to Unicode code
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# point 226.
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#
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# We now apply escapes while converting directly to bytes,
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# avoiding this double encoding.
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#
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# This code also handles cases where the unicode input has
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# non-ASCII code-points in it by converting it to UTF-8. TXT
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# records aren't defined for Unicode, but this is the best we
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# can do to preserve meaning. For example,
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#
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# foo\u200bbar
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#
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# (where \u200b is Unicode code point 0x200b) will be treated
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# as if the input had been the UTF-8 encoding of that string,
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# namely:
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#
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# foo\226\128\139bar
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#
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unescaped = b""
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l = len(self.value)
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i = 0
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while i < l:
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c = self.value[i]
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i += 1
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if c == "\\":
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if i >= l: # pragma: no cover (can't happen via get())
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raise dns.exception.UnexpectedEnd
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c = self.value[i]
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i += 1
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if c.isdigit():
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if i >= l:
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raise dns.exception.UnexpectedEnd
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c2 = self.value[i]
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i += 1
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if i >= l:
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raise dns.exception.UnexpectedEnd
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c3 = self.value[i]
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i += 1
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if not (c2.isdigit() and c3.isdigit()):
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raise dns.exception.SyntaxError
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codepoint = int(c) * 100 + int(c2) * 10 + int(c3)
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if codepoint > 255:
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raise dns.exception.SyntaxError
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unescaped += b"%c" % (codepoint)
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else:
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# Note that as mentioned above, if c is a Unicode
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# code point outside of the ASCII range, then this
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# += is converting that code point to its UTF-8
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# encoding and appending multiple bytes to
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# unescaped.
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unescaped += c.encode()
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else:
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unescaped += c.encode()
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return Token(self.ttype, bytes(unescaped))
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class Tokenizer:
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"""A DNS zone file format tokenizer.
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A token object is basically a (type, value) tuple. The valid
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types are EOF, EOL, WHITESPACE, IDENTIFIER, QUOTED_STRING,
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COMMENT, and DELIMITER.
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file: The file to tokenize
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ungotten_char: The most recently ungotten character, or None.
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ungotten_token: The most recently ungotten token, or None.
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multiline: The current multiline level. This value is increased
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by one every time a '(' delimiter is read, and decreased by one every time
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a ')' delimiter is read.
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quoting: This variable is true if the tokenizer is currently
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reading a quoted string.
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eof: This variable is true if the tokenizer has encountered EOF.
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delimiters: The current delimiter dictionary.
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line_number: The current line number
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filename: A filename that will be returned by the where() method.
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idna_codec: A dns.name.IDNACodec, specifies the IDNA
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encoder/decoder. If None, the default IDNA 2003
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encoder/decoder is used.
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"""
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def __init__(
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self,
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f: Any = sys.stdin,
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filename: Optional[str] = None,
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idna_codec: Optional[dns.name.IDNACodec] = None,
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):
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"""Initialize a tokenizer instance.
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f: The file to tokenize. The default is sys.stdin.
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This parameter may also be a string, in which case the tokenizer
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will take its input from the contents of the string.
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filename: the name of the filename that the where() method
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will return.
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idna_codec: A dns.name.IDNACodec, specifies the IDNA
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encoder/decoder. If None, the default IDNA 2003
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encoder/decoder is used.
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"""
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if isinstance(f, str):
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f = io.StringIO(f)
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if filename is None:
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filename = "<string>"
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elif isinstance(f, bytes):
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f = io.StringIO(f.decode())
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if filename is None:
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filename = "<string>"
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else:
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if filename is None:
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if f is sys.stdin:
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filename = "<stdin>"
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else:
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filename = "<file>"
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self.file = f
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self.ungotten_char: Optional[str] = None
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self.ungotten_token: Optional[Token] = None
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self.multiline = 0
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self.quoting = False
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self.eof = False
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self.delimiters = _DELIMITERS
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self.line_number = 1
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assert filename is not None
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self.filename = filename
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if idna_codec is None:
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self.idna_codec: dns.name.IDNACodec = dns.name.IDNA_2003
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else:
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self.idna_codec = idna_codec
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def _get_char(self) -> str:
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"""Read a character from input."""
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if self.ungotten_char is None:
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if self.eof:
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c = ""
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else:
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c = self.file.read(1)
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if c == "":
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self.eof = True
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elif c == "\n":
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self.line_number += 1
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else:
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c = self.ungotten_char
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self.ungotten_char = None
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return c
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def where(self) -> Tuple[str, int]:
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"""Return the current location in the input.
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Returns a (string, int) tuple. The first item is the filename of
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the input, the second is the current line number.
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"""
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return (self.filename, self.line_number)
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def _unget_char(self, c: str) -> None:
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"""Unget a character.
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The unget buffer for characters is only one character large; it is
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an error to try to unget a character when the unget buffer is not
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empty.
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c: the character to unget
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raises UngetBufferFull: there is already an ungotten char
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"""
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if self.ungotten_char is not None:
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# this should never happen!
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raise UngetBufferFull # pragma: no cover
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self.ungotten_char = c
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def skip_whitespace(self) -> int:
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"""Consume input until a non-whitespace character is encountered.
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The non-whitespace character is then ungotten, and the number of
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whitespace characters consumed is returned.
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If the tokenizer is in multiline mode, then newlines are whitespace.
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Returns the number of characters skipped.
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"""
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skipped = 0
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while True:
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c = self._get_char()
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if c != " " and c != "\t":
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if (c != "\n") or not self.multiline:
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self._unget_char(c)
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return skipped
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skipped += 1
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def get(self, want_leading: bool = False, want_comment: bool = False) -> Token:
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"""Get the next token.
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want_leading: If True, return a WHITESPACE token if the
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first character read is whitespace. The default is False.
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want_comment: If True, return a COMMENT token if the
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first token read is a comment. The default is False.
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Raises dns.exception.UnexpectedEnd: input ended prematurely
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Raises dns.exception.SyntaxError: input was badly formed
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Returns a Token.
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"""
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if self.ungotten_token is not None:
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utoken = self.ungotten_token
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self.ungotten_token = None
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if utoken.is_whitespace():
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if want_leading:
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return utoken
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elif utoken.is_comment():
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if want_comment:
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return utoken
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else:
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return utoken
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skipped = self.skip_whitespace()
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if want_leading and skipped > 0:
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return Token(WHITESPACE, " ")
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token = ""
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ttype = IDENTIFIER
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has_escape = False
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while True:
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c = self._get_char()
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if c == "" or c in self.delimiters:
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if c == "" and self.quoting:
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raise dns.exception.UnexpectedEnd
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if token == "" and ttype != QUOTED_STRING:
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if c == "(":
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self.multiline += 1
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self.skip_whitespace()
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continue
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elif c == ")":
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if self.multiline <= 0:
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raise dns.exception.SyntaxError
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self.multiline -= 1
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self.skip_whitespace()
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continue
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elif c == '"':
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if not self.quoting:
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self.quoting = True
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self.delimiters = _QUOTING_DELIMITERS
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ttype = QUOTED_STRING
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continue
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else:
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self.quoting = False
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self.delimiters = _DELIMITERS
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self.skip_whitespace()
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continue
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elif c == "\n":
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return Token(EOL, "\n")
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elif c == ";":
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while 1:
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c = self._get_char()
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if c == "\n" or c == "":
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break
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token += c
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if want_comment:
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self._unget_char(c)
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return Token(COMMENT, token)
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elif c == "":
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if self.multiline:
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raise dns.exception.SyntaxError(
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"unbalanced parentheses"
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)
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return Token(EOF, comment=token)
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elif self.multiline:
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self.skip_whitespace()
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token = ""
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continue
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else:
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return Token(EOL, "\n", comment=token)
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else:
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# This code exists in case we ever want a
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# delimiter to be returned. It never produces
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# a token currently.
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token = c
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ttype = DELIMITER
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else:
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self._unget_char(c)
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break
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elif self.quoting and c == "\n":
|
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raise dns.exception.SyntaxError("newline in quoted string")
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elif c == "\\":
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#
|
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# It's an escape. Put it and the next character into
|
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# the token; it will be checked later for goodness.
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#
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token += c
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has_escape = True
|
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c = self._get_char()
|
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if c == "" or (c == "\n" and not self.quoting):
|
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raise dns.exception.UnexpectedEnd
|
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token += c
|
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if token == "" and ttype != QUOTED_STRING:
|
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if self.multiline:
|
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raise dns.exception.SyntaxError("unbalanced parentheses")
|
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ttype = EOF
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return Token(ttype, token, has_escape)
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|
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def unget(self, token: Token) -> None:
|
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"""Unget a token.
|
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|
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The unget buffer for tokens is only one token large; it is
|
||||
an error to try to unget a token when the unget buffer is not
|
||||
empty.
|
||||
|
||||
token: the token to unget
|
||||
|
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Raises UngetBufferFull: there is already an ungotten token
|
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"""
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||||
|
||||
if self.ungotten_token is not None:
|
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raise UngetBufferFull
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self.ungotten_token = token
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def next(self):
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"""Return the next item in an iteration.
|
||||
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||||
Returns a Token.
|
||||
"""
|
||||
|
||||
token = self.get()
|
||||
if token.is_eof():
|
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raise StopIteration
|
||||
return token
|
||||
|
||||
__next__ = next
|
||||
|
||||
def __iter__(self):
|
||||
return self
|
||||
|
||||
# Helpers
|
||||
|
||||
def get_int(self, base: int = 10) -> int:
|
||||
"""Read the next token and interpret it as an unsigned integer.
|
||||
|
||||
Raises dns.exception.SyntaxError if not an unsigned integer.
|
||||
|
||||
Returns an int.
|
||||
"""
|
||||
|
||||
token = self.get().unescape()
|
||||
if not token.is_identifier():
|
||||
raise dns.exception.SyntaxError("expecting an identifier")
|
||||
if not token.value.isdigit():
|
||||
raise dns.exception.SyntaxError("expecting an integer")
|
||||
return int(token.value, base)
|
||||
|
||||
def get_uint8(self) -> int:
|
||||
"""Read the next token and interpret it as an 8-bit unsigned
|
||||
integer.
|
||||
|
||||
Raises dns.exception.SyntaxError if not an 8-bit unsigned integer.
|
||||
|
||||
Returns an int.
|
||||
"""
|
||||
|
||||
value = self.get_int()
|
||||
if value < 0 or value > 255:
|
||||
raise dns.exception.SyntaxError(
|
||||
"%d is not an unsigned 8-bit integer" % value
|
||||
)
|
||||
return value
|
||||
|
||||
def get_uint16(self, base: int = 10) -> int:
|
||||
"""Read the next token and interpret it as a 16-bit unsigned
|
||||
integer.
|
||||
|
||||
Raises dns.exception.SyntaxError if not a 16-bit unsigned integer.
|
||||
|
||||
Returns an int.
|
||||
"""
|
||||
|
||||
value = self.get_int(base=base)
|
||||
if value < 0 or value > 65535:
|
||||
if base == 8:
|
||||
raise dns.exception.SyntaxError(
|
||||
f"{value:o} is not an octal unsigned 16-bit integer"
|
||||
)
|
||||
else:
|
||||
raise dns.exception.SyntaxError(
|
||||
"%d is not an unsigned 16-bit integer" % value
|
||||
)
|
||||
return value
|
||||
|
||||
def get_uint32(self, base: int = 10) -> int:
|
||||
"""Read the next token and interpret it as a 32-bit unsigned
|
||||
integer.
|
||||
|
||||
Raises dns.exception.SyntaxError if not a 32-bit unsigned integer.
|
||||
|
||||
Returns an int.
|
||||
"""
|
||||
|
||||
value = self.get_int(base=base)
|
||||
if value < 0 or value > 4294967295:
|
||||
raise dns.exception.SyntaxError(
|
||||
"%d is not an unsigned 32-bit integer" % value
|
||||
)
|
||||
return value
|
||||
|
||||
def get_uint48(self, base: int = 10) -> int:
|
||||
"""Read the next token and interpret it as a 48-bit unsigned
|
||||
integer.
|
||||
|
||||
Raises dns.exception.SyntaxError if not a 48-bit unsigned integer.
|
||||
|
||||
Returns an int.
|
||||
"""
|
||||
|
||||
value = self.get_int(base=base)
|
||||
if value < 0 or value > 281474976710655:
|
||||
raise dns.exception.SyntaxError(
|
||||
"%d is not an unsigned 48-bit integer" % value
|
||||
)
|
||||
return value
|
||||
|
||||
def get_string(self, max_length: Optional[int] = None) -> str:
|
||||
"""Read the next token and interpret it as a string.
|
||||
|
||||
Raises dns.exception.SyntaxError if not a string.
|
||||
Raises dns.exception.SyntaxError if token value length
|
||||
exceeds max_length (if specified).
|
||||
|
||||
Returns a string.
|
||||
"""
|
||||
|
||||
token = self.get().unescape()
|
||||
if not (token.is_identifier() or token.is_quoted_string()):
|
||||
raise dns.exception.SyntaxError("expecting a string")
|
||||
if max_length and len(token.value) > max_length:
|
||||
raise dns.exception.SyntaxError("string too long")
|
||||
return token.value
|
||||
|
||||
def get_identifier(self) -> str:
|
||||
"""Read the next token, which should be an identifier.
|
||||
|
||||
Raises dns.exception.SyntaxError if not an identifier.
|
||||
|
||||
Returns a string.
|
||||
"""
|
||||
|
||||
token = self.get().unescape()
|
||||
if not token.is_identifier():
|
||||
raise dns.exception.SyntaxError("expecting an identifier")
|
||||
return token.value
|
||||
|
||||
def get_remaining(self, max_tokens: Optional[int] = None) -> List[Token]:
|
||||
"""Return the remaining tokens on the line, until an EOL or EOF is seen.
|
||||
|
||||
max_tokens: If not None, stop after this number of tokens.
|
||||
|
||||
Returns a list of tokens.
|
||||
"""
|
||||
|
||||
tokens = []
|
||||
while True:
|
||||
token = self.get()
|
||||
if token.is_eol_or_eof():
|
||||
self.unget(token)
|
||||
break
|
||||
tokens.append(token)
|
||||
if len(tokens) == max_tokens:
|
||||
break
|
||||
return tokens
|
||||
|
||||
def concatenate_remaining_identifiers(self, allow_empty: bool = False) -> str:
|
||||
"""Read the remaining tokens on the line, which should be identifiers.
|
||||
|
||||
Raises dns.exception.SyntaxError if there are no remaining tokens,
|
||||
unless `allow_empty=True` is given.
|
||||
|
||||
Raises dns.exception.SyntaxError if a token is seen that is not an
|
||||
identifier.
|
||||
|
||||
Returns a string containing a concatenation of the remaining
|
||||
identifiers.
|
||||
"""
|
||||
s = ""
|
||||
while True:
|
||||
token = self.get().unescape()
|
||||
if token.is_eol_or_eof():
|
||||
self.unget(token)
|
||||
break
|
||||
if not token.is_identifier():
|
||||
raise dns.exception.SyntaxError
|
||||
s += token.value
|
||||
if not (allow_empty or s):
|
||||
raise dns.exception.SyntaxError("expecting another identifier")
|
||||
return s
|
||||
|
||||
def as_name(
|
||||
self,
|
||||
token: Token,
|
||||
origin: Optional[dns.name.Name] = None,
|
||||
relativize: bool = False,
|
||||
relativize_to: Optional[dns.name.Name] = None,
|
||||
) -> dns.name.Name:
|
||||
"""Try to interpret the token as a DNS name.
|
||||
|
||||
Raises dns.exception.SyntaxError if not a name.
|
||||
|
||||
Returns a dns.name.Name.
|
||||
"""
|
||||
if not token.is_identifier():
|
||||
raise dns.exception.SyntaxError("expecting an identifier")
|
||||
name = dns.name.from_text(token.value, origin, self.idna_codec)
|
||||
return name.choose_relativity(relativize_to or origin, relativize)
|
||||
|
||||
def get_name(
|
||||
self,
|
||||
origin: Optional[dns.name.Name] = None,
|
||||
relativize: bool = False,
|
||||
relativize_to: Optional[dns.name.Name] = None,
|
||||
) -> dns.name.Name:
|
||||
"""Read the next token and interpret it as a DNS name.
|
||||
|
||||
Raises dns.exception.SyntaxError if not a name.
|
||||
|
||||
Returns a dns.name.Name.
|
||||
"""
|
||||
|
||||
token = self.get()
|
||||
return self.as_name(token, origin, relativize, relativize_to)
|
||||
|
||||
def get_eol_as_token(self) -> Token:
|
||||
"""Read the next token and raise an exception if it isn't EOL or
|
||||
EOF.
|
||||
|
||||
Returns a string.
|
||||
"""
|
||||
|
||||
token = self.get()
|
||||
if not token.is_eol_or_eof():
|
||||
raise dns.exception.SyntaxError(
|
||||
'expected EOL or EOF, got %d "%s"' % (token.ttype, token.value)
|
||||
)
|
||||
return token
|
||||
|
||||
def get_eol(self) -> str:
|
||||
return self.get_eol_as_token().value
|
||||
|
||||
def get_ttl(self) -> int:
|
||||
"""Read the next token and interpret it as a DNS TTL.
|
||||
|
||||
Raises dns.exception.SyntaxError or dns.ttl.BadTTL if not an
|
||||
identifier or badly formed.
|
||||
|
||||
Returns an int.
|
||||
"""
|
||||
|
||||
token = self.get().unescape()
|
||||
if not token.is_identifier():
|
||||
raise dns.exception.SyntaxError("expecting an identifier")
|
||||
return dns.ttl.from_text(token.value)
|
||||
Reference in New Issue
Block a user