usr
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lib64
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python2.7
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site-packages
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dns
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ttl.py
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# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc. # # Permission to use, copy, modify, and distribute this software and its # documentation for any purpose with or without fee is hereby granted, # provided that the above copyright notice and this permission notice # appear in all copies. # # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. """DNS TTL conversion.""" import dns.exception class BadTTL(dns.exception.SyntaxError): pass def from_text(text): """Convert the text form of a TTL to an integer. The BIND 8 units syntax for TTLs (e.g. '1w6d4h3m10s') is supported. @param text: the textual TTL @type text: string @raises dns.ttl.BadTTL: the TTL is not well-formed @rtype: int """ if text.isdigit(): total = long(text) else: if not text[0].isdigit(): raise BadTTL total = 0L current = 0L for c in text: if c.isdigit(): current *= 10 current += long(c) else: c = c.lower() if c == 'w': total += current * 604800L elif c == 'd': total += current * 86400L elif c == 'h': total += current * 3600L elif c == 'm': total += current * 60L elif c == 's': total += current else: raise BadTTL("unknown unit '%s'" % c) current = 0 if not current == 0: raise BadTTL("trailing integer") if total < 0L or total > 2147483647L: raise BadTTL("TTL should be between 0 and 2^31 - 1 (inclusive)") return total
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