You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
2.2 KiB
69 lines
2.2 KiB
6 years ago
|
# 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
|
||
|
|
from ._compat import long
|
||
|
|
|
||
|
|
|
||
|
|
class BadTTL(dns.exception.SyntaxError):
|
||
|
|
|
||
|
|
"""DNS TTL value is not well-formed."""
|
||
|
|
|
||
|
|
|
||
|
|
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 = long(0)
|
||
|
|
current = long(0)
|
||
|
|
for c in text:
|
||
|
|
if c.isdigit():
|
||
|
|
current *= 10
|
||
|
|
current += long(c)
|
||
|
|
else:
|
||
|
|
c = c.lower()
|
||
|
|
if c == 'w':
|
||
|
|
total += current * long(604800)
|
||
|
|
elif c == 'd':
|
||
|
|
total += current * long(86400)
|
||
|
|
elif c == 'h':
|
||
|
|
total += current * long(3600)
|
||
|
|
elif c == 'm':
|
||
|
|
total += current * long(60)
|
||
|
|
elif c == 's':
|
||
|
|
total += current
|
||
|
|
else:
|
||
|
|
raise BadTTL("unknown unit '%s'" % c)
|
||
|
|
current = 0
|
||
|
|
if not current == 0:
|
||
|
|
raise BadTTL("trailing integer")
|
||
|
|
if total < long(0) or total > long(2147483647):
|
||
|
|
raise BadTTL("TTL should be between 0 and 2^31 - 1 (inclusive)")
|
||
|
|
return total
|