+import re
+from ipaddress import IPv4Address, IPv6Address
+from typing import List, Dict, Any, Iterator, Tuple, Sequence
+
+
second = 1
minute = 60*second
hour = 60*minute
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}$'.format(REGEX_label)
+ if re.match(pattern, label):
+ return label
+ raise Exception(label+" is not a valid label")
+
+def check_hostname(name: str) -> str:
+ # check hostname for validity
+ pattern = r'^{0}(\.{0})*\.?$'.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"
+ elif time % week == 0:
+ return str(time//week)+"w"
+ elif time % day == 0:
+ return str(time//day)+"d"
+ elif time % hour == 0:
+ return str(time//hour)+"h"
+ elif time % minute == 0:
+ return str(time//minute)+"m"
+ else:
+ return str(time)
+
+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 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 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_rr(self, owner: str, zone: 'Zone') -> Any:
+ return zone.RR(owner, 'MX', '{0} {1}'.format(self._priority, zone.abs_hostname(self._name)))
+
+
+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_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 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 Address:
- def __init__(self, IPv4 = None, IPv6 = None):
- self._IPv4 = IPv4
- self._IPv6 = IPv6
+class CNAME:
+ def __init__(self, name: str) -> None:
+ self._name = check_hostname(name)
- def IPv4(self):
- return Address(IPv4 = self._IPv4)
+ 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 IPv6(self):
- return Address(IPv6 = self._IPv6)
+ def generate_rr(self, owner: str, zone: 'Zone') -> Any:
+ return zone.RR(owner, 'NS', zone.abs_hostname(self._name))
+
+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, address = None, MX = None, TCP = None, UDP = None):
- self._address = address
+ def __init__(self, *records: List[Any]) -> None:
+ self._records = records
+
+ def generate_rrs(self, owner: str, zone: 'Zone') -> Iterator:
+ 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))
-class Service:
- def __init__(self, SRV = None, TLSA=None):
- self._SRV = SRV
- self._TLSA = TLSA
-class CName:
- def __init__(self, name):
- self._name = name
+def SecureDelegation(name: str, tag: int, alg: int, digest: int, key: str) -> Name:
+ return Name(NS(name), DS(tag, alg, digest, key))
-class Delegation():
- def __init__(self, NS, DS = None):
- pass
class Zone:
- def __init__(self, name, mail, NS,
- secondary_refresh, secondary_retry, secondary_discard,
- NX_TTL = None, A_TTL = None, other_TTL = None,
- domains = []):
- assert other_TTL is not None
- self._NX_TTL = other_TTL if NX_TTL is None else NX_TTL
- self._A_TTL = other_TTL if A_TTL is None else A_TTL
+ def __init__(self, name: str, serialfile: str, dbfile: str, mail: str, NS: List[str],
+ secondary_refresh: int, secondary_retry: int, secondary_expire: int,
+ NX_TTL: int = None, A_TTL: int = None, other_TTL: int = None,
+ domains: Dict[str, Any] = {}) -> None:
+ self._serialfile = serialfile
+ self._dbfile = dbfile
+
+ if not name.endswith('.'): raise Exception("Expected an absolute hostname")
+ self._name = check_hostname(name)
+ if not mail.endswith('.'): raise Exception("Mail must be absolute, end with a dot")
+ atpos = mail.find('@')
+ if atpos < 0 or atpos > mail.find('.'): raise Exception("Mail must contain an @ before the first dot")
+ self._mail = check_hostname(mail.replace('@', '.', 1))
+ self._NS = list(map(check_hostname, NS))
+
+ self._refresh = secondary_refresh
+ self._retry = secondary_retry
+ self._expire = secondary_expire
+
+ if other_TTL is None: raise Exception("Must give other_TTL")
+ self._NX_TTL = NX_TTL
+ self._A_TTL = self._AAAA_TTL = A_TTL
self._other_TTL = other_TTL
+
+ self._domains = domains
+
+ def RR(self, owner: str, recordType: str, data: str) -> str:
+ '''generate given RR, in textual representation'''
+ assert re.match(r'^[A-Z]+$', recordType), "got invalid record type"
+ # figure out TTL
+ attrname = "_"+recordType+"_TTL"
+ TTL = None # type: int
+ if hasattr(self, attrname):
+ TTL = getattr(self, attrname)
+ if TTL is None:
+ TTL = self._other_TTL
+ # be done
+ 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
+
+ def inc_serial(self) -> int:
+ # get serial
+ cur_serial = 0
+ try:
+ with open(self._serialfile) as f:
+ cur_serial = int(f.read())
+ except FileNotFoundError:
+ pass
+ # increment serial
+ cur_serial += 1
+ # save serial
+ with open(self._serialfile, 'w') as f:
+ f.write(str(cur_serial))
+ # be done
+ return cur_serial
+
+ def generate_rrs(self) -> Iterator:
+ # SOA record
+ serial = self.inc_serial()
+ yield self.RR(self._name, 'SOA',
+ ('{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 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):
+ yield rr
+
+ def write(self) -> None:
+ with open(self._dbfile, 'w') as f:
+ for rr in self.generate_rrs():
+ f.write(rr+"\n")
+ print(rr)
projects / zonemaker.git / blobdiff