> Buggy due to the use of scanf at Modueles/socketmodule.c:868

I don't think so. The following test fails because sscanf() returns 5 instead of 4:

    if (sscanf(name, "%d.%d.%d.%d%c", &d1, &d2, &d3, &d4, &ch) == 4 && ...)

So '192.168.1.1  ' is passed to getaddrinfo().

If you consider that '192.168.1.1  ' is an invalid name, you should report the issue to the vendor of the C library of your OS.

--

On Linux, the "issue" is also present in inet_ntoa():

$ python
Python 2.7.3 (default, Jul 24 2012, 11:41:40) 
[GCC 4.6.3 20120306 (Red Hat 4.6.3-2)] on linux2
>>> import ctypes
>>> buffer=ctypes.create_string_buffer(128)
>>> libc=ctypes.cdll.LoadLibrary("libc.so.6")

>>> libc.inet_aton(b"127.0.0.1", ctypes.byref(buffer))
1
>>> buffer.raw[:4]
'\x7f\x00\x00\x01'

>>> libc.inet_aton(b"127.0.0.2   ", ctypes.byref(buffer))
1
>>> buffer.raw[:4]
'\x7f\x00\x00\x02'

The source code of the inet_aton() function of the GNU libc:

http://sourceware.org/git/?p=glibc.git;a=blob;f=resolv/inet_addr.c;h=144b87a74c1aef62779862e78e5f87e18e66ee9e;hb=HEAD#l108

Website of the GNU libc:
http://www.gnu.org/software/libc/