RustPython · youknowone · Sep 16, 2025 · Sep 16, 2025
diff --git a/Lib/test/test_uuid.py b/Lib/test/test_uuid.py
@@ -1,6 +1,7 @@
 import unittest
 from test import support
 from test.support import import_helper
+from test.support.script_helper import assert_python_ok
 import builtins
 import contextlib
 import copy
@@ -32,8 +33,7 @@ def get_command_stdout(command, args):
 class BaseTestUUID:
     uuid = None
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
+    @unittest.expectedFailure # TODO: RUSTPYTHON
     def test_safe_uuid_enum(self):
         class CheckedSafeUUID(enum.Enum):
             safe = 0
@@ -775,10 +775,37 @@ def test_cli_uuid5_ouputted_with_valid_namespace_and_name(self):
 class TestUUIDWithoutExtModule(BaseTestUUID, unittest.TestCase):
     uuid = py_uuid
 
+
 @unittest.skipUnless(c_uuid, 'requires the C _uuid module')
 class TestUUIDWithExtModule(BaseTestUUID, unittest.TestCase):
     uuid = c_uuid
 
+    def check_has_stable_libuuid_extractable_node(self):
+        if not self.uuid._has_stable_extractable_node:
+            self.skipTest("libuuid cannot deduce MAC address")
+
+    @unittest.skipUnless(os.name == 'posix', 'POSIX only')
+    def test_unix_getnode_from_libuuid(self):
+        self.check_has_stable_libuuid_extractable_node()
+        script = 'import uuid; print(uuid._unix_getnode())'
+        _, n_a, _ = assert_python_ok('-c', script)
+        _, n_b, _ = assert_python_ok('-c', script)
+        n_a, n_b = n_a.decode().strip(), n_b.decode().strip()
+        self.assertTrue(n_a.isdigit())
+        self.assertTrue(n_b.isdigit())
+        self.assertEqual(n_a, n_b)
+
+    @unittest.skipUnless(os.name == 'nt', 'Windows only')
+    def test_windows_getnode_from_libuuid(self):
+        self.check_has_stable_libuuid_extractable_node()
+        script = 'import uuid; print(uuid._windll_getnode())'
+        _, n_a, _ = assert_python_ok('-c', script)
+        _, n_b, _ = assert_python_ok('-c', script)
+        n_a, n_b = n_a.decode().strip(), n_b.decode().strip()
+        self.assertTrue(n_a.isdigit())
+        self.assertTrue(n_b.isdigit())
+        self.assertEqual(n_a, n_b)
+
 
 class BaseTestInternals:
     _uuid = py_uuid

diff --git a/Lib/uuid.py b/Lib/uuid.py
@@ -572,39 +572,43 @@ def _netstat_getnode():
 try:
     import _uuid
     _generate_time_safe = getattr(_uuid, "generate_time_safe", None)
+    _has_stable_extractable_node = getattr(_uuid, "has_stable_extractable_node", False)
     _UuidCreate = getattr(_uuid, "UuidCreate", None)
 except ImportError:
     _uuid = None
     _generate_time_safe = None
+    _has_stable_extractable_node = False
     _UuidCreate = None
 
 
 def _unix_getnode():
     """Get the hardware address on Unix using the _uuid extension module."""
-    if _generate_time_safe:
+    if _generate_time_safe and _has_stable_extractable_node:
         uuid_time, _ = _generate_time_safe()
         return UUID(bytes=uuid_time).node
 
 def _windll_getnode():
     """Get the hardware address on Windows using the _uuid extension module."""
-    if _UuidCreate:
+    if _UuidCreate and _has_stable_extractable_node:
         uuid_bytes = _UuidCreate()
         return UUID(bytes_le=uuid_bytes).node
 
 def _random_getnode():
     """Get a random node ID."""
-    # RFC 4122, $4.1.6 says "For systems with no IEEE address, a randomly or
-    # pseudo-randomly generated value may be used; see Section 4.5.  The
-    # multicast bit must be set in such addresses, in order that they will
-    # never conflict with addresses obtained from network cards."
+    # RFC 9562, §6.10-3 says that
+    #
+    #   Implementations MAY elect to obtain a 48-bit cryptographic-quality
+    #   random number as per Section 6.9 to use as the Node ID. [...] [and]
+    #   implementations MUST set the least significant bit of the first octet
+    #   of the Node ID to 1. This bit is the unicast or multicast bit, which
+    #   will never be set in IEEE 802 addresses obtained from network cards.
     #
     # The "multicast bit" of a MAC address is defined to be "the least
     # significant bit of the first octet".  This works out to be the 41st bit
     # counting from 1 being the least significant bit, or 1<<40.
     #
     # See https://en.wikipedia.org/w/index.php?title=MAC_address&oldid=1128764812#Universal_vs._local_(U/L_bit)
-    import random
-    return random.getrandbits(48) | (1 << 40)
+    return int.from_bytes(os.urandom(6)) | (1 << 40)
 
 
 # _OS_GETTERS, when known, are targeted for a specific OS or platform.

diff --git a/stdlib/src/uuid.rs b/stdlib/src/uuid.rs
@@ -30,4 +30,7 @@ mod _uuid {
     fn has_uuid_generate_time_safe(_vm: &VirtualMachine) -> u32 {
         0
     }
+
+    #[pyattr(name = "has_stable_extractable_node")]
+    const HAS_STABLE_EXTRACTABLE_NODE: bool = false;
 }