New submission from Cecile Tonglet:
The IPv6 detection in asyncio.base_events.create_server only detect if IPv6 is
available instead of checking if the interface can actually support it.
I noticed that by using Python in a Docker container (example code to reproduce
in attachment):
docker run -it --rm -v /tmp/test_ipv6.py:/src/test_ipv6.py python:3.6 python
/src/test_ipv6.py
Will result in:
Traceback (most recent call last):
File "/usr/local/lib/python3.6/asyncio/base_events.py", line 1043, in
create_server
sock.bind(sa)
OSError: [Errno 99] Cannot assign requested address
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/src/test_ipv6.py", line 11, in <module>
server = loop.run_until_complete(server_creation)
File "/usr/local/lib/python3.6/asyncio/base_events.py", line 466, in
run_until_complete
return future.result()
File "/usr/local/lib/python3.6/asyncio/base_events.py", line 1047, in
create_server
% (sa, err.strerror.lower()))
OSError: [Errno 99] error while attempting to bind on address ('::1', 27015, 0,
0): cannot assign requested address
By default Docker containers have only IPv4 enabled:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
38: eth0@if39: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UP group default
link/ether 02:42:ac:11:00:02 brd ff:ff:ff:ff:ff:ff
inet 172.17.0.2/16 scope global eth0
valid_lft forever preferred_lft forever
I believe this detection mechanism should rely on the interface requested. I
found this on the web for Python 2 that manage to get the info per interface:
https://pastebin.com/VEnhF1Ht but it's using an external library.
However if you change the hostname to 127.0.0.1 it works normally.
----------
components: asyncio
files: test_ipv6.py
messages: 298474
nosy: cecton, yselivanov
priority: normal
severity: normal
status: open
title: loop.create_server does not detect if the interface is IPv6 enabled
type: behavior
versions: Python 3.4, Python 3.5, Python 3.6
Added file: http://bugs.python.org/file47019/test_ipv6.py
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30945>
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