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"""
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High-level BIND stuff
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"""
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from __future__ import with_statement
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import bind_conf as bindc
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import os.path, datetime
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DEFAULT_TTL = bindc.Interval(3600)
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class Settings (object) :
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"""
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A set of basic settings for a zone, mostly default TTL/refresh/retry/expire/minimum settings
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"""
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def __init__ (self, ttl, hostmaster, refresh, retry, expire, minimum) :
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self.ttl = ttl
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self.hostmaster = hostmaster
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self.refresh = refresh
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self.retry = retry
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self.expire = expire
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self.minimum = minimum
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class AutoSerial (object) :
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"""
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Automatically generate the next serial to use by loading it from a file.
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The generated serials are in YYYYMMDDXX format.
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"""
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def __init__ (self, path) :
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"""
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Load the current serial
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@param path the path to the serial file
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"""
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# store
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self.path = path
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# load it
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# XXX: locking
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serial = self.read()
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# current date
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today = datetime.date.today()
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# parse it
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if serial :
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date, code = self.parse(serial)
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else :
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date, code = today, 0
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# increment it
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date, code = self.next(date, code)
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# format it
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self._serial = self.build(date, code)
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# write it out
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self.write(self._serial)
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def parse (self, serial) :
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"""
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Parse the given serial into a (datetime.date, code) format
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"""
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# build it into a date
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date = datetime.date(
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year = int(serial[0:4]),
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month = int(serial[4:6]),
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day = int(serial[6:8])
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)
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code = int(serial[8:])
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return date, code
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def next (self, date, code) :
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"""
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Return the next valid serial following the given one
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"""
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# current date
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today = datetime.date.today()
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# now to increment?
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if date < today :
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# jump to today's first serial
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date = today
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code = 0
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else :
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# today or overflowed into the future, just increment the code
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code += 1
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# code overflowed into next day?
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if code > 99 :
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date += datetime.timedelta(days=1)
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code = 0
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# ok
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return date, code
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def build (self, date, code) :
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"""
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Build a serial code the given date/code
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"""
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assert 0 <= code <= 99
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return "%s%02d" % (date.strftime("%Y%m%d"), code)
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def read (self) :
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"""
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Read the current serial, returning it, or None, if not found...
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"""
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# if it doesn't exist, default
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if not os.path.exists(self.path) :
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return None
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# read it
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with open(self.path) as fh :
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return fh.read().strip()
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def write (self, serial) :
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"""
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Write a new serial
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"""
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with open(self.path, 'w') as fh :
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fh.write("%s\n" % (serial, ))
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def serial (self) :
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"""
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Return a new, unused serial code (before __init__)
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"""
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return self._serial
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class Domain (bindc.ZoneFile) :
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"""
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A domain has a skeleton of stuff defined, but the rest is $INCLUDE'd from elsewhere, which is useful for
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multi-domain setups where the domains are mostly similar
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"""
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def __init__ (self, domain, path, nameservers, mailservers, serial, settings, include=None, objs=None) :
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"""
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@param domain the domain name
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@param path the path to the zone file
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@param nameservers list of nameservers as labels
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@param mailservers list of (pref, label) tuples for MX records
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@param serial the serial code to use
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@param settings the TTL/SOA settings to use
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@param include the optional zonefile to include
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@param objs the optional other objects to add to the zonefile
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"""
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super(Domain, self).__init__(domain, path)
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# the default TTL
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self.add_directive(bindc.TTLDirective(settings.ttl))
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# the SOA record
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self.add_record(bindc.SOA(None, nameservers[0],
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settings.hostmaster, serial, settings.refresh, settings.retry, settings.expire, settings.minimum
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))
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# the NS records
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for label in nameservers :
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self.add_record(bindc.NS(None, label))
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# the MX records
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for pref, label in mailservers :
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self.add_record(bindc.MX(None, pref, label))
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# include?
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if include :
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self.add_directive(bindc.IncludeDirective(include))
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if objs :
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for obj in objs :
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self.add_obj(obj)
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