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"""
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Configuration file output for the ISC DNS server: BIND
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"""
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import conf
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class Object (conf.ConfObject) :
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"""
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Our own version of ConfObject that knows how to format comments
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"""
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def _fmt_comments (self) :
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"""
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Format comments using the standard format:
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";" <comment>
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"""
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for comment in self.comments :
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if comment is not None :
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yield "; %s" % (comment, )
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class ZoneFile (Object, conf.File) :
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"""
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A zone file containing a bunch of directives, resource records and comments
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"""
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def __init__ (self, name, path, ttl=None, comment=None) :
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"""
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@param name the name of the zonefile, for status stuff
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@param path the path to the zonefile
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@param ttl default TTL to use
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@param comment optional comments
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"""
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Object.__init__(comment)
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conf.File.__init__(name, path)
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# init
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self.objects = []
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if ttl :
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self.add_directive(TTLDirective(ttl))
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def add_obj (self, obj) :
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"""
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Add an Object onto the list of things to include in this zone file
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"""
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self.objects.append(obj)
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# various aliases...
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add_comment = add_record = add_directive = add_obj
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class Comment (Object) :
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"""
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A comment, is, well, a comment :)
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"""
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def __init__ (self, comment) :
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"""
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@param comment the comment string
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"""
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Object.__init__(self, [comment])
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def fmt_lines (self) :
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"""
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Yield a single line with the comment
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"""
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return self._fmt_comments()
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class Label (object) :
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"""
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A label, as used in a ResourceRecord, either as the label, or the rdata for various resource types
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You can also use strs, this just implements a __str__ method
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"""
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def __init__ (self, label) :
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"""
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@param label the literal label to use
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"""
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self.label = label
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def __str__ (self) :
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return self.label
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class Origin (Label) :
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"""
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A label that represents the zone's origin
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"""
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def __init__ (self) :
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pass
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def __str__ (self) :
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return '@'
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class FQDN (Label) :
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"""
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A label that represents the given external domain (i.e. this adds the . to the end that people always forget).
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"""
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def __init__ (self, fqdn) :
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self.fqdn = fqdn
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def __str__ (self) :
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return "%s." % (self.fqdn, )
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class Interval (object) :
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"""
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A time interval suitable for use in SOA records
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"""
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def __init__ (self, s=None, m=None, h=None, d=None) :
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"""
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@param s seconds
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@param m minutes
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@param h hours
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@param d days
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"""
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self.s = s
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self.m = m
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self.h = h
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self.d = d
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def __str__ (self) :
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"""
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If only seconds were given, just return those directly, otherwise, apply units
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"""
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if self.s and not self.m and not self.h and not self.d :
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return str(self.s)
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else :
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return "%s%s%s%s" % (
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"%ds" % self.s if self.s else '',
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"%dm" % self.m if self.m else '',
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"%dh" % self.h if self.h else '',
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"%dd" % self.d if self.d else ''
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)
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class ResourceRecord (Object) :
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"""
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A generic resource record for a BIND zone file
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"""
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def __init__ (self, label, type, rdata, cls='IN', ttl=None, **kwargs) :
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"""
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@param label the "name" of this record, or None to referr to the previous record's label
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@param type the type as a string ('A', 'TXT', etc.)
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@param rdata the rdata, as a raw string
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@param cls the class, e.g. 'IN'
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@param ttl the time-to-live value in seconds, or None to omit it
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"""
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super(ResourceRecord, self).__init__(**kwargs)
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self.label = label
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self.type = type
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self.rdata = rdata
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self.cls = cls
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self.ttl = ttl
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def fmt_lines (self) :
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"""
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Just format the lines, eh
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"""
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# prefix comments
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for line in self._fmt_comments() :
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yield line
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# then format the line
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# XXX: TTL?
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yield "%30s %4s%4s %8s %s" % (self.label if self.label is not None else '', str(self.ttl) if self.ttl else '', self.cls, self.type, self.rdata)
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class SOA (ResourceRecord) :
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"""
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"Identifies the start of a zone of authority", must be the first record
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"""
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def __init__ (self, label, primary_ns, hostmaster, serial, refresh, retry, expire, minimum, **kwargs) :
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"""
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@param label the "name" of the zone, usually ORIGIN
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@param primary_ns the address of the primary NS server
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@param hostmaster the mailbox of the zone's hostmaster
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@param serial the serial number of the zone as an integer
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@param refresh time interval between zone refreshes in seconds
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@param retry time interval between retrys for failed refreshes
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@param expire time interval before zone data can no longer be considered authorative
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@param minimum minimum TTL for RRs in this zone
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"""
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super(SOA, self).__init__(label, 'SOA', "%s %s ( %s %s %s %s %s )" % (
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primary_ns, hostmaster, serial, refresh, retry, expire, minimum
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), **kwargs)
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class A (ResourceRecord) :
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"""
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An IPv4 forward address
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"""
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def __init__ (self, label, addr, **kwargs) :
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"""
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@param label the "name" of the address
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@param addr the IPv4 target address
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"""
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assert(addr.is_v4())
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super(A, self).__init__(label, 'A', addr, **kwargs)
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class AAAA (ResourceRecord) :
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"""
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An IPv6 forward address
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"""
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def __init__ (self, label, addr, **kwargs) :
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"""
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@param label the "name" of the address
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@param addr the IPv6 target address
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"""
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assert(addr.is_v6())
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super(AAAA, self).__init__(label, 'AAAA', addr.strCompressed(), **kwargs)
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class CNAME (ResourceRecord) :
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"""
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A canonical-name alias
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"""
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def __init__ (self, label, target, **kwargs) :
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"""
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@param label the "name" of the alias
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@param target the alias target
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"""
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super(CNAME, self).__init__(label, 'CNAME', target, **kwargs)
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class TXT (ResourceRecord) :
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"""
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A human-readable information record
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"""
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def __init__ (self, label, text, **kwargs) :
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"""
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@param label the "name" of the text record
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@param text the text data, shouldn't contain any quotes...
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"""
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super(TXT, self).__init__(label, 'TXT', '"%s"' % text, **kwargs)
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class MX (ResourceRecord) :
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"""
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A mail-exchange definition
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"""
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def __init__ (self, label, pref, exchange, **kwargs) :
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"""
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@param label the "name" of the domain to handle mail for
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@param pref the numerical preference for this exchange
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@param exchange the domain name of the mail exchange (SMTP server)
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"""
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super(MX, self).__init__(label, 'MX', "%d %s" % (pref, exchange), **kwargs)
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class NS (ResourceRecord) :
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"""
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An authorative name server
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"""
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def __init__ (self, label, nsname, **kwargs) :
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"""
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@param label the "name" of the domain to have a nameserver for
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@param nsname the name of the nameserver
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"""
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super(NS, self).__init__(label, 'NS', nsname)
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class PTR (ResourceRecord) :
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"""
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An IPv4/IPv6 reverse address
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"""
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def __init__ (self, addr, name, **kwargs) :
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"""
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@param addr the addr.IP to map via in-addr.arpa
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@param name the name to map the address to
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"""
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# XXX: quick hack, this gives an absolute name
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label = addr.reverseName()
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super(PTR, self).__init__(label, 'PTR', name)
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class Directive (Object) :
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"""
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Special directives that can be used in zone files to control behaviour
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"""
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def __init__ (self, name, *args, **kwargs) :
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"""
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@param name the $NAME bit
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@param args optional list of space-seprated arguments, Nones are ignored
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"""
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super(Directive, self).__init__(**kwargs)
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self.name = name
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self.args = [arg for arg in args if arg is not None]
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def fmt_lines (self) :
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# prefix comments
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for line in self._fmt_comments() :
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yield line
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# then format it
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yield "$%s%s" % (self.name, (' ' + ' '.join(str(arg) for arg in self.args)) if self.args else '')
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class OriginDirective (Directive) :
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"""
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Set the origin used to resolve the zone's labels.
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Note that the origin label is not absolute by default - use FQDN for that
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"""
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def __init__ (self, origin, **kwargs) :
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"""
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@param origin the origin label
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"""
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super(OriginDirective, self).__init__('ORIGIN', origin, **kwargs)
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class TTLDirective (Directive) :
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"""
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Set the TTL used for records by default
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"""
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def __init__ (self, ttl, **kwargs) :
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"""
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@param ttl the new ttl to use
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"""
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super(TTLDirective, self).__init__('TTL', ttl, **kwargs)
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class IncludeDirective (Directive) :
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"""
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Include another zoen file, optionally with a different origin
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"""
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def __init__ (self, filename, origin=None, **kwargs) :
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"""
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@param filename the zone file to include
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@param origin the optional origin to process the zonefile with
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"""
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super(IncludeDirective, self).__init__('INCLUDE', filename, origin, **kwargs)
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class GenerateDirective (Directive) :
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"""
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Generate a bunch of numbered records using an expression for the label and rdata.
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At the simplest, any "$" in the expression is replaced with the value of the iterator.
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"""
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def __init__ (self, range, lhs, type, rhs, ttl=None, cls=None, **kwargs) :
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"""
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@param range (start, stop, step) tuple
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@param lhs expression to generate the label
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@param type the resource record type
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@param rhs expression to generate the rdata
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"""
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super(GenerateDirective, self).__init__('GENERATE', '%d-%d' % range, lhs, ttl, cls, type, rhs, **kwargs)
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