bpo-36384: Remove check for leading zeroes in IPv4 addresses (GH-12577)
Stop rejecting IPv4 octets with leading zeroes as ambiguously octal.
Plenty of other tools generate decimal IPv4 octets with leading zeroes,
so keeping this check hurts interoperability.
Patch by Joel Croteau.
diff --git a/Lib/ipaddress.py b/Lib/ipaddress.py
index 15507d6..a88cf3d 100644
--- a/Lib/ipaddress.py
+++ b/Lib/ipaddress.py
@@ -1165,12 +1165,6 @@
raise ValueError(msg % octet_str)
# Convert to integer (we know digits are legal)
octet_int = int(octet_str, 10)
- # Any octets that look like they *might* be written in octal,
- # and which don't look exactly the same in both octal and
- # decimal are rejected as ambiguous
- if octet_int > 7 and octet_str[0] == '0':
- msg = "Ambiguous (octal/decimal) value in %r not permitted"
- raise ValueError(msg % octet_str)
if octet_int > 255:
raise ValueError("Octet %d (> 255) not permitted" % octet_int)
return octet_int
diff --git a/Lib/test/test_ipaddress.py b/Lib/test/test_ipaddress.py
index 0e0753f..53f6f12 100644
--- a/Lib/test/test_ipaddress.py
+++ b/Lib/test/test_ipaddress.py
@@ -92,11 +92,14 @@
y = pickle.loads(pickle.dumps(x, proto))
self.assertEqual(y, x)
+
class CommonTestMixin_v4(CommonTestMixin):
def test_leading_zeros(self):
self.assertInstancesEqual("000.000.000.000", "0.0.0.0")
self.assertInstancesEqual("192.168.000.001", "192.168.0.1")
+ self.assertInstancesEqual("016.016.016.016", "16.16.16.16")
+ self.assertInstancesEqual("001.000.008.016", "1.0.8.16")
def test_int(self):
self.assertInstancesEqual(0, "0.0.0.0")
@@ -229,15 +232,6 @@
assertBadOctet("1.2.3.4::", "4::")
assertBadOctet("1.a.2.3", "a")
- def test_octal_decimal_ambiguity(self):
- def assertBadOctet(addr, octet):
- msg = "Ambiguous (octal/decimal) value in %r not permitted in %r"
- with self.assertAddressError(re.escape(msg % (octet, addr))):
- ipaddress.IPv4Address(addr)
-
- assertBadOctet("016.016.016.016", "016")
- assertBadOctet("001.000.008.016", "008")
-
def test_octet_length(self):
def assertBadOctet(addr, octet):
msg = "At most 3 characters permitted in %r in %r"
diff --git a/Misc/NEWS.d/next/Library/2019-03-27-02-09-22.bpo-36385.we2F45.rst b/Misc/NEWS.d/next/Library/2019-03-27-02-09-22.bpo-36385.we2F45.rst
new file mode 100644
index 0000000..26f6dd7
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-03-27-02-09-22.bpo-36385.we2F45.rst
@@ -0,0 +1 @@
+Stop rejecting IPv4 octets for being ambiguously octal. Leading zeros are ignored, and no longer are assumed to specify octal octets. Octets are always decimal numbers. Octets must still be no more than three digits, including leading zeroes.