bpo-27860: ipaddress: fix Interface missed some attributes (GH-12836)

IPv4Interface and IPv6Interface did not has netmask and hostmask
attributes when its argument is bytes or int.

This commit extracts method for constructors of Network and Interface,
and ensure Interface class always provides them.

Author: methane

Lib/ipaddress.py

@@ -532,6 +532,30 @@ def _prefix_from_ip_string(cls, ip_str):
         except ValueError:
             cls._report_invalid_netmask(ip_str)
 
+    @classmethod
+    def _split_addr_prefix(cls, address):
+        """Helper function to parse address of Network/Interface.
+
+        Arg:
+            address: Argument of Network/Interface.
+
+        Returns:
+            (addr, prefix) tuple.
+        """
+        # a packed address or integer
+        if isinstance(address, (bytes, int)):
+            return address, cls._max_prefixlen
+
+        if not isinstance(address, tuple):
+            # Assume input argument to be string or any object representation
+            # which converts into a formatted IP prefix string.
+            address = _split_optional_netmask(address)
+
+        # Constructing from a tuple (addr, [mask])
+        if len(address) > 1:
+            return address
+        return address[0], cls._max_prefixlen
+
     def __reduce__(self):
         return self.__class__, (str(self),)
 
@@ -1305,32 +1329,16 @@ def is_link_local(self):
 class IPv4Interface(IPv4Address):
 
     def __init__(self, address):
-        if isinstance(address, (bytes, int)):
-            IPv4Address.__init__(self, address)
-            self.network = IPv4Network(self._ip)
-            self._prefixlen = self._max_prefixlen
-            return
-
-        if isinstance(address, tuple):
-            IPv4Address.__init__(self, address[0])
-            if len(address) > 1:
-                self._prefixlen = int(address[1])
-            else:
-                self._prefixlen = self._max_prefixlen
-
-            self.network = IPv4Network(address, strict=False)
-            self.netmask = self.network.netmask
-            self.hostmask = self.network.hostmask
-            return
-
-        addr = _split_optional_netmask(address)
-        IPv4Address.__init__(self, addr[0])
+        addr, mask = self._split_addr_prefix(address)
 
-        self.network = IPv4Network(address, strict=False)
+        IPv4Address.__init__(self, addr)
+        self.network = IPv4Network((addr, mask), strict=False)
+        self.netmask = self.network.netmask
         self._prefixlen = self.network._prefixlen
 
-        self.netmask = self.network.netmask
-        self.hostmask = self.network.hostmask
+    @functools.cached_property
+    def hostmask(self):
+        return self.network.hostmask
 
     def __str__(self):
         return '%s/%d' % (self._string_from_ip_int(self._ip),
@@ -1435,20 +1443,7 @@ def __init__(self, address, strict=True):
             ValueError: If strict is True and a network address is not
               supplied.
         """
-        # Constructing from a packed address or integer
-        if isinstance(address, (int, bytes)):
-            addr = address
-            mask = self._max_prefixlen
-        # Constructing from a tuple (addr, [mask])
-        elif isinstance(address, tuple):
-            addr = address[0]
-            mask = address[1] if len(address) > 1 else self._max_prefixlen
-        # Assume input argument to be string or any object representation
-        # which converts into a formatted IP prefix string.
-        else:
-            args = _split_optional_netmask(address)
-            addr = self._ip_int_from_string(args[0])
-            mask = args[1] if len(args) == 2 else self._max_prefixlen
+        addr, mask = self._split_addr_prefix(address)
 
         self.network_address = IPv4Address(addr)
         self.netmask, self._prefixlen = self._make_netmask(mask)
@@ -1979,28 +1974,16 @@ def sixtofour(self):
 class IPv6Interface(IPv6Address):
 
     def __init__(self, address):
-        if isinstance(address, (bytes, int)):
-            IPv6Address.__init__(self, address)
-            self.network = IPv6Network(self._ip)
-            self._prefixlen = self._max_prefixlen
-            return
-        if isinstance(address, tuple):
-            IPv6Address.__init__(self, address[0])
-            if len(address) > 1:
-                self._prefixlen = int(address[1])
-            else:
-                self._prefixlen = self._max_prefixlen
-            self.network = IPv6Network(address, strict=False)
-            self.netmask = self.network.netmask
-            self.hostmask = self.network.hostmask
-            return
+        addr, mask = self._split_addr_prefix(address)
 
-        addr = _split_optional_netmask(address)
-        IPv6Address.__init__(self, addr[0])
-        self.network = IPv6Network(address, strict=False)
+        IPv6Address.__init__(self, addr)
+        self.network = IPv6Network((addr, mask), strict=False)
         self.netmask = self.network.netmask
         self._prefixlen = self.network._prefixlen
-        self.hostmask = self.network.hostmask
+
+    @functools.cached_property
+    def hostmask(self):
+        return self.network.hostmask
 
     def __str__(self):
         return '%s/%d' % (self._string_from_ip_int(self._ip),
@@ -2110,20 +2093,7 @@ def __init__(self, address, strict=True):
             ValueError: If strict was True and a network address was not
               supplied.
         """
-        # Constructing from a packed address or integer
-        if isinstance(address, (int, bytes)):
-            addr = address
-            mask = self._max_prefixlen
-        # Constructing from a tuple (addr, [mask])
-        elif isinstance(address, tuple):
-            addr = address[0]
-            mask = address[1] if len(address) > 1 else self._max_prefixlen
-        # Assume input argument to be string or any object representation
-        # which converts into a formatted IP prefix string.
-        else:
-            args = _split_optional_netmask(address)
-            addr = self._ip_int_from_string(args[0])
-            mask = args[1] if len(args) == 2 else self._max_prefixlen
+        addr, mask = self._split_addr_prefix(address)
 
         self.network_address = IPv6Address(addr)
         self.netmask, self._prefixlen = self._make_netmask(mask)

Lib/test/test_ipaddress.py

@@ -399,7 +399,13 @@ class NetmaskTestMixin_v4(CommonTestMixin_v4):
     """Input validation on interfaces and networks is very similar"""
 
     def test_no_mask(self):
-        self.assertEqual(str(self.factory('1.2.3.4')), '1.2.3.4/32')
+        for address in ('1.2.3.4', 0x01020304, b'\x01\x02\x03\x04'):
+            net = self.factory(address)
+            self.assertEqual(str(net), '1.2.3.4/32')
+            self.assertEqual(str(net.netmask), '255.255.255.255')
+            self.assertEqual(str(net.hostmask), '0.0.0.0')
+            # IPv4Network has prefixlen, but IPv4Interface doesn't.
+            # Should we add it to IPv4Interface too? (bpo-36392)
 
     def test_split_netmask(self):
         addr = "1.2.3.4/32/24"
@@ -527,6 +533,15 @@ def test_subnet_of_mixed_types(self):
 class NetmaskTestMixin_v6(CommonTestMixin_v6):
     """Input validation on interfaces and networks is very similar"""
 
+    def test_no_mask(self):
+        for address in ('::1', 1, b'\x00'*15 + b'\x01'):
+            net = self.factory(address)
+            self.assertEqual(str(net), '::1/128')
+            self.assertEqual(str(net.netmask), 'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff')
+            self.assertEqual(str(net.hostmask), '::')
+            # IPv6Network has prefixlen, but IPv6Interface doesn't.
+            # Should we add it to IPv4Interface too? (bpo-36392)
+
     def test_split_netmask(self):
         addr = "cafe:cafe::/128/190"
         with self.assertAddressError("Only one '/' permitted in %r" % addr):