Eryk Sun added the comment:
socket.gethostbyname calls the internal function setipaddr, which tries to
avoid a name resolution by first calling either inet_pton or inet_addr.
Otherwise it calls getaddrinfo.
Windows
-------
setipaddr calls inet_addr, which supports octal [1]. ctypes example:
ws2_32 = ctypes.WinDLL('ws2_32')
in_addr = ctypes.c_ubyte * 4
ws2_32.inet_addr.restype = in_addr
>>> ws2_32.inet_addr(b'0177.0000.0000.0001')[:]
[127, 0, 0, 1]
3.5+ could call inet_pton since it was added in Vista. However, it does not
support octal:
>>> addr = in_addr()
>>> ws2_32.inet_pton(socket.AF_INET, b'0177.0000.0000.0001', addr)
0
>>> ws2_32.inet_pton(socket.AF_INET, b'127.0.0.1', addr)
1
>>> addr[:]
[127, 0, 0, 1]
socket.inet_pton instead calls WSAStringToAddressA, which does support octal:
>>> list(socket.inet_pton(socket.AF_INET, '0177.0000.0000.0001'))
[127, 0, 0, 1]
socket.gethostbyname_ex calls gethostbyname since gethostbyname_r isn't
defined. This does not support octal and errors out:
>>> socket.gethostbyname_ex('0177.0000.0000.0001')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
socket.herror: [Errno 11001] host not found
getaddrinfo also does not support octal and errors out:
>>> socket.getaddrinfo('0177.0000.0000.0001', None)[0]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Program Files\Python35\lib\socket.py", line 732, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno 11001] getaddrinfo failed
>>> ctypes.FormatError(11001)
'No such host is known.'
[1]: https://msdn.microsoft.com/en-us/library/ms738563#internet_addresses
----------
nosy: +eryksun
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<http://bugs.python.org/issue27612>
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