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bpo-39991: uuid._netstat_getnode() ignores IPv6 addresses (GH-19043)

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uuid.getnode() now skips IPv6 addresses with the same string length
than a MAC address (17 characters): only use MAC addresses.
This commit is contained in:
Victor Stinner 2020-03-17 15:51:42 +01:00 • committed by GitHub
parent a45b695b9f
commit eb886db1e9
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 51 additions and 10 deletions
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54
Lib/test/test_uuid.py
View file

@ -23,6 +23,12 @@ def importable(name):
return False return False
def mock_get_command_stdout(data):
def get_command_stdout(command, args):
return io.BytesIO(data.encode())
return get_command_stdout
class BaseTestUUID: class BaseTestUUID:
uuid = None uuid = None
@ -673,7 +679,6 @@ class TestUUIDWithExtModule(BaseTestUUID, unittest.TestCase):
class BaseTestInternals: class BaseTestInternals:
_uuid = py_uuid _uuid = py_uuid
def test_find_under_heading(self): def test_find_under_heading(self):
data = '''\ data = '''\
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
@ -685,15 +690,12 @@ en0 1500 192.168.90 x071 1714807956 0 711348489 0 0
224.0.0.1 224.0.0.1
''' '''
def mock_get_command_stdout(command, args):
return io.BytesIO(data.encode())
# The above data is from AIX - with '.' as _MAC_DELIM and strings # The above data is from AIX - with '.' as _MAC_DELIM and strings
# shorter than 17 bytes (no leading 0). (_MAC_OMITS_LEADING_ZEROES=True) # shorter than 17 bytes (no leading 0). (_MAC_OMITS_LEADING_ZEROES=True)
with mock.patch.multiple(self.uuid, with mock.patch.multiple(self.uuid,
_MAC_DELIM=b'.', _MAC_DELIM=b'.',
_MAC_OMITS_LEADING_ZEROES=True, _MAC_OMITS_LEADING_ZEROES=True,
_get_command_stdout=mock_get_command_stdout): _get_command_stdout=mock_get_command_stdout(data)):
mac = self.uuid._find_mac_under_heading( mac = self.uuid._find_mac_under_heading(
command='netstat', command='netstat',
args='-ian', args='-ian',
@ -702,6 +704,43 @@ en0 1500 192.168.90 x071 1714807956 0 711348489 0 0
self.assertEqual(mac, 0xfead0c012304) self.assertEqual(mac, 0xfead0c012304)
def test_find_under_heading_ipv6(self):
# bpo-39991: IPv6 address "fe80::5054:ff:fe9" looks like a MAC address
# (same string length) but must be skipped
data = '''\
Name Mtu Network Address Ipkts Ierrs Idrop Opkts Oerrs Coll
vtnet 1500 <Link#1> 52:54:00:9d:0e:67 10017 0 0 8174 0 0
vtnet - fe80::%vtnet0 fe80::5054:ff:fe9 0 - - 4 - -
vtnet - 192.168.122.0 192.168.122.45 8844 - - 8171 - -
lo0 16384 <Link#2> lo0 260148 0 0 260148 0 0
lo0 - ::1/128 ::1 193 - - 193 - -
ff01::1%lo0
ff02::2:2eb7:74fa
ff02::2:ff2e:b774
ff02::1%lo0
ff02::1:ff00:1%lo
lo0 - fe80::%lo0/64 fe80::1%lo0 0 - - 0 - -
ff01::1%lo0
ff02::2:2eb7:74fa
ff02::2:ff2e:b774
ff02::1%lo0
ff02::1:ff00:1%lo
lo0 - 127.0.0.0/8 127.0.0.1 259955 - - 259955 - -
224.0.0.1
'''
with mock.patch.multiple(self.uuid,
_MAC_DELIM=b':',
_MAC_OMITS_LEADING_ZEROES=False,
_get_command_stdout=mock_get_command_stdout(data)):
mac = self.uuid._find_mac_under_heading(
command='netstat',
args='-ian',
heading=b'Address',
)
self.assertEqual(mac, 0x5254009d0e67)
def test_find_mac_near_keyword(self): def test_find_mac_near_keyword(self):
# key and value are on the same line # key and value are on the same line
data = ''' data = '''
@ -710,14 +749,11 @@ cscotun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
eth0 Link encap:Ethernet HWaddr 12:34:56:78:90:ab eth0 Link encap:Ethernet HWaddr 12:34:56:78:90:ab
''' '''
def mock_get_command_stdout(command, args):
return io.BytesIO(data.encode())
# The above data will only be parsed properly on non-AIX unixes. # The above data will only be parsed properly on non-AIX unixes.
with mock.patch.multiple(self.uuid, with mock.patch.multiple(self.uuid,
_MAC_DELIM=b':', _MAC_DELIM=b':',
_MAC_OMITS_LEADING_ZEROES=False, _MAC_OMITS_LEADING_ZEROES=False,
_get_command_stdout=mock_get_command_stdout): _get_command_stdout=mock_get_command_stdout(data)):
mac = self.uuid._find_mac_near_keyword( mac = self.uuid._find_mac_near_keyword(
command='ifconfig', command='ifconfig',
args='', args='',

5
Lib/uuid.py
View file

@ -456,7 +456,10 @@ def _find_mac_under_heading(command, args, heading):
try: try:
words = line.rstrip().split() words = line.rstrip().split()
word = words[column_index] word = words[column_index]
if len(word) == 17: # Accept 'HH:HH:HH:HH:HH:HH' MAC address (ex: '52:54:00:9d:0e:67'),
# but reject IPv6 address (ex: 'fe80::5054:ff:fe9') detected
# by '::' pattern.
if len(word) == 17 and b'::' not in word:
mac = int(word.replace(_MAC_DELIM, b''), 16) mac = int(word.replace(_MAC_DELIM, b''), 16)
elif _MAC_OMITS_LEADING_ZEROES: elif _MAC_OMITS_LEADING_ZEROES:
# (Only) on AIX the macaddr value given is not prefixed by 0, e.g. # (Only) on AIX the macaddr value given is not prefixed by 0, e.g.

2
Misc/NEWS.d/next/Library/2020-03-17-12-40-38.bpo-39991.hLPPs4.rst Normal file
View file

@ -0,0 +1,2 @@
:func:`uuid.getnode` now skips IPv6 addresses with the same string length
than a MAC address (17 characters): only use MAC addresses.