import re
from ipaddress import IPv4Address, IPv6Address
-from typing import List, Dict, Any, Iterator
+from typing import List, Dict, Any, Iterator, Tuple, Sequence
second = 1
day = 24*hour
week = 7*day
+REGEX_label = r'[a-zA-Z90-9]([a-zA-Z90-9-]{0,61}[a-zA-Z90-9])?' # max. 63 characters; must not start or end with hyphen
+
+def check_label(label: str) -> str:
+ pattern = r'^{0}$'.format(REGEX_label)
+ if re.match(pattern, label):
+ return label
+ raise Exception(label+" is not a valid label")
+
def check_hostname(name: str) -> str:
# check hostname for validity
- label = r'[a-zA-Z90-9]([a-zA-Z90-9-]{0,61}[a-zA-Z90-9])?' # must not start or end with hyphen
- pattern = r'^{0}(\.{0})*\.?'.format(label)
+ pattern = r'^{0}(\.{0})*\.?$'.format(REGEX_label)
if re.match(pattern, name):
return name
raise Exception(name+" is not a valid hostname")
+def check_hex(data: str) -> str:
+ if re.match('^[a-fA-F0-9]+$', data):
+ return data
+ raise Exception(data+" is not valid hex data")
+
def time(time: int) -> str:
if time == 0:
return "0"
else:
return str(time)
-class Address:
- # mypy does not know about the ipaddress types, so leave this class unannotated for now
- def __init__(self, IPv4 = None, IPv6 = None) -> None:
- if IPv4 is None and IPv6 is None:
- raise Exception("There has to be at least one valid address!")
- self._IPv4 = None if IPv4 is None else IPv4Address(IPv4)
- self._IPv6 = None if IPv6 is None else IPv6Address(IPv6)
+def column_widths(datas: Sequence, widths: Sequence[int]):
+ assert len(datas) == len(widths)+1, "There must be as one more data points as widths"
+ result = ""
+ width_sum = 0
+ for data, width in zip(datas, widths): # will *not* cover the last point
+ result += str(data)+" " # add data point, and a minimal space
+ width_sum += width
+ if len(result) < width_sum: # add padding
+ result += (width_sum - len(result))*" "
+ # last data point
+ return result+str(datas[-1])
+
+
+## Enums
+class Protocol:
+ TCP = 'tcp'
+ UDP = 'udp'
+
+class Algorithm:
+ RSA_SHA256 = 8
+
+class Digest:
+ SHA1 = 1
+ SHA256 = 2
+
+
+## Record types
+class A:
+ def __init__(self, address: str) -> None:
+ self._address = IPv4Address(address)
- def IPv4(self):
- return Address(IPv4 = self._IPv4)
+ def generate_rr(self, owner: str, zone: 'Zone') -> Any:
+ return zone.RR(owner, 'A', self._address)
+
+
+class AAAA:
+ def __init__(self, address: str) -> None:
+ self._address = IPv6Address(address)
- def IPv6(self):
- return Address(IPv6 = self._IPv6)
+ def generate_rr(self, owner: str, zone: 'Zone') -> Any:
+ return zone.RR(owner, 'AAAA', self._address)
+
+
+class MX:
+ def __init__(self, name: str, prio: int = 10) -> None:
+ self._priority = int(prio)
+ self._name = check_hostname(name)
- def generate_rrs(self, owner: str, zone: 'Zone') -> Iterator:
- if self._IPv4 is not None:
- yield zone.RR(owner, 'A', self._IPv4)
- if self._IPv6 is not None:
- yield zone.RR(owner, 'AAAA', self._IPv6)
+ def generate_rr(self, owner: str, zone: 'Zone') -> Any:
+ return zone.RR(owner, 'MX', '{0} {1}'.format(self._priority, zone.abs_hostname(self._name)))
-class Name:
- def __init__(self, address: Address = None, MX: List = None,
- TCP: Dict[int, Any] = None, UDP: Dict[int, Any] = None) -> None:
- self._address = address
+
+class SRV:
+ def __init__(self, protocol: str, service: str, name: str, port: int, prio: int, weight: int) -> None:
+ self._service = check_label(service)
+ self._protocol = check_label(protocol)
+ self._priority = int(prio)
+ self._weight = int(weight)
+ self._port = int(port)
+ self._name = check_hostname(name)
- def generate_rrs(self, owner: str, zone: 'Zone') -> Iterator:
- if self._address is not None:
- for rr in self._address.generate_rrs(owner, zone):
- yield rr
- # TODO
+ def generate_rr(self, owner: str, zone: 'Zone') -> Any:
+ return zone.RR('_{0}._{1}.{2}'.format(self._service, self._protocol, owner), 'SRV',
+ '{0} {1} {2} {3}'.format(self._priority, self._weight, self._port, zone.abs_hostname(self._name)))
+
+
+class TLSA:
+ class Usage:
+ CA = 0 # certificate must pass the usual CA check, with the CA specified by the TLSA record
+ EndEntity_PlusCAs = 1 # the certificate must match the TLSA record *and* pass the usual CA check
+ TrustAnchor = 2 # the certificate must pass a check with the TLSA record giving the (only) trust anchor
+ EndEntity = 3 # the certificate must match the TLSA record
-class Service:
- def __init__(self, SRV: str = None, TLSA: str=None) -> None:
- self._SRV = None if SRV is None else check_hostname(SRV)
- self._TLSA = TLSA
+ class Selector:
+ Full = 0
+ SubjectPublicKeyInfo = 1
+
+ class MatchingType:
+ Exact = 0
+ SHA256 = 1
+ SHA512 = 2
+
+ def __init__(self, protocol: str, port: int, usage: int, selector: int, matching_type: int, data: str) -> None:
+ self._port = int(port)
+ self._protocol = str(protocol)
+ self._usage = int(usage)
+ self._selector = int(selector)
+ self._matching_type = int(matching_type)
+ self._data = check_hex(data)
+
+ def generate_rr(self, owner: str, zone: 'Zone') -> Any:
+ return zone.RR('_{0}._{1}.{2}'.format(self._port, self._protocol, owner), 'TLSA', '{0} {1} {2} {3}'.format(self._usage, self._selector, self._matching_type, self._data))
-class CName:
+
+class CNAME:
def __init__(self, name: str) -> None:
self._name = check_hostname(name)
- def generate_rrs(self, owner: str, zone: 'Zone') -> Iterator:
- yield zone.RR(owner, 'CNAME', zone.abs_hostname(self._name))
+ def generate_rr(self, owner: str, zone: 'Zone') -> Any:
+ return zone.RR(owner, 'CNAME', zone.abs_hostname(self._name))
+
+
+class NS:
+ def __init__(self, name: str) -> None:
+ self._name = check_hostname(name)
+
+ def generate_rr(self, owner: str, zone: 'Zone') -> Any:
+ return zone.RR(owner, 'NS', zone.abs_hostname(self._name))
+
-class Delegation():
- def __init__(self, NS: str, DS: str = None) -> None:
- self._NS = NS
- self._DS = DS
+class DS:
+ def __init__(self, tag: int, alg: int, digest: int, key: str) -> None:
+ self._tag = int(tag)
+ self._key = check_hex(key)
+ self._alg = int(alg)
+ self._digest = int(digest)
+
+ def generate_rr(self, owner: str, zone: 'Zone') -> Any:
+ return zone.RR(owner, 'DS', '{0} {1} {2} {3}'.format(self._tag, self._alg, self._digest, self._key))
+
+## Higher-level classes
+class Name:
+ def __init__(self, *records: List[Any]) -> None:
+ self._records = records
def generate_rrs(self, owner: str, zone: 'Zone') -> Iterator:
- yield zone.RR(owner, 'NS', zone.abs_hostname(self._NS))
- # TODO DS
+ for record in self._records:
+ # this could still be a list
+ if isinstance(record, list):
+ for subrecord in record:
+ yield subrecord.generate_rr(owner, zone)
+ else:
+ yield record.generate_rr(owner, zone)
+
+
+def CName(name: str) -> Name:
+ return Name(CNAME(name))
+
+
+def Delegation(name: str) -> Name:
+ return Name(NS(name))
+
+
+def SecureDelegation(name: str, tag: int, alg: int, digest: int, key: str) -> Name:
+ return Name(NS(name), DS(tag, alg, digest, key))
+
class Zone:
def __init__(self, name: str, serialfile: str, dbfile: str, mail: str, NS: List[str],
if TTL is None:
TTL = self._other_TTL
# be done
- return "{0:<31} {1:<7} {2:<7} {3}".format(self.abs_hostname(owner), TTL, recordType, data)
+ return column_widths((self.abs_hostname(owner), time(TTL), recordType, data), (32, 8, 8))
def abs_hostname(self, name):
+ if name == '.' or name == '@':
+ return self._name
if name.endswith('.'):
return name
return name+"."+self._name
# SOA record
serial = self.inc_serial()
yield self.RR(self._name, 'SOA',
- ('{NS} {mail} ({serial} {refresh} {retry} {expire} {NX_TTL}) ; '+
- '(serial refresh retry expire NX_TTL)').format(
+ ('{NS} {mail} {serial} {refresh} {retry} {expire} {NX_TTL}'+
+ ' ; primns mail serial refresh retry expire NX_TTL').format(
NS=self.abs_hostname(self._NS[0]), mail=self._mail, serial=serial,
refresh=time(self._refresh), retry=time(self._retry), expire=time(self._expire),
NX_TTL=time(self._NX_TTL))
)
# NS records
- for ns in self._NS:
- yield self.RR(self._name, 'NS', self.abs_hostname(ns))
-
+ for name in self._NS:
+ yield NS(name).generate_rr(self._name, self)
# all the rest
for name in sorted(self._domains.keys(), key=lambda s: list(reversed(s.split('.')))):
for rr in self._domains[name].generate_rrs(name, self):
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