refactor RRs

[zonemaker.git] / zonemaker / zone.py

diff --git a/zonemaker/zone.py b/zonemaker/zone.py
index 435b0392669fcaea56b6039c5c4a45f80becf705..15add06c766036b1b62a9a89997ee3a79065e2ed 100644 (file)
--- a/zonemaker/zone.py
+++ b/zonemaker/zone.py
@@ -1,67 +1,236 @@
-import ipaddress, re
+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
 
 second = 1
 minute = 60*second
 hour = 60*minute
 day = 24*hour

+week = 7*day
+
+TCP = 'tcp'
+UDP = 'udp'

 
 

-def hostname(name):
+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)
     # 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)

-    print(pattern)

     if re.match(pattern, name):
         return name
     raise Exception(name+" is not a valid hostname")
 
     if re.match(pattern, name):
         return name
     raise Exception(name+" is not a valid hostname")
 

-class Address:
-    def __init__(self, IPv4 = None, IPv6 = None):
-        self._IPv4 = None if IPv4 is None else ipaddress.IPv4Address(IPv4)
-        self._IPv6 = None if IPv6 is None else ipaddress.IPv6Address(IPv6)
+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])
+
+
+## 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 = str(service)
+        self._protocol = str(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:
+    def __init__(self, protocol: str, port: int, key: str) -> None:
+        # TODO: fix key stuff
+        self._port = int(port)
+        self._protocol = str(protocol)
+        self._key = str(key)

     
     

-    def IPv4(self):
-        return Address(IPv4 = self._IPv4)
+    def generate_rr(self, owner: str, zone: 'Zone') -> Any:
+        return zone.RR('_{0}._{1}.{2}'.format(self._port, self._protocol, owner), 'TLSA', self._key)
+
+
+class CNAME:
+    def __init__(self, name: str) -> None:
+        self._name = check_hostname(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 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, key: str) -> None:
+        # TODO: fix key stuff
+        self._key = str(key)
+    
+    def generate_rr(self, owner: str, zone: 'Zone') -> Any:
+        return zone.RR(owner, 'DS', self._key)
+
+## Higher-level classes

 class Name:
 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)

 
 

-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 CName(name: str) -> Name:
+    return Name(CNAME(name))
+
+
+def Delegation(name: str, key: str = None) -> Name:
+    records = [NS(name)]
+    if key is not None:
+        records.append(DS(key))
+    return Name(*records)

 
 

-class Delegation():
-    def __init__(self, NS, DS = None):
-        pass

 
 class Zone:
 
 class Zone:

-    def __init__(self, name, mail, NS,
-                 secondary_refresh, secondary_retry, secondary_discard,
-                 NX_TTL = None, A_TTL = None, other_TTL = None,
-                 domains = []):
-        self._name = hostname(name)
+    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")
         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 = hostname(mail.replace('@', '.', 1))
-        self._NS = list(map(hostname, NS))
+        self._mail = check_hostname(mail.replace('@', '.', 1))
+        self._NS = list(map(check_hostname, NS))

         
         

-        self._secondary_refresh = secondary_refresh
-        self._secondary_retry = secondary_retry
-        self._secondary_discard = secondary_discard
+        self._refresh = secondary_refresh
+        self._retry = secondary_retry
+        self._expire = secondary_expire

         
         

-        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
+        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._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}) ; '+
+                      '(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, file):
-        raise NotImplementedError()
+    def write(self) -> None:
+        with open(self._dbfile, 'w') as f:
+            for rr in self.generate_rrs():
+                f.write(rr+"\n")
+                print(rr)