New submission from Leonardo Mörlein :
The tuple (host, port) is ("fe80::5054:01ff:fe04:3402%node4_client", 22) in
https://github.com/python/cpython/blob/master/Lib/asyncio/base_events.py#L918.
The substring "node4_client" identifies the interface, which is needed for link
local connections.
The function self._ensure_resolved() is called and resolves to
infos[0][4] = ("fe80::5054:01ff:fe04:3402", 22, something, 93), where 93 is the
resolved scope id (see sin6_scope_id from struct sockaddr_in6 from man ipv6).
Afterwards the self.sock_connect() is called with address = infos[0][4]. In
self.sock_connect() the function self._ensure_resolved() is called again. In
https://github.com/python/cpython/blob/master/Lib/asyncio/base_events.py#L1282
the scope id is stripped from the tuple. The tuple (host, port) is now only
("fe80::5054:01ff:fe04:3402", 22) and therefore the scope id is lost.
I wrote this quick fix, which is not really suitable as a real solution for the
problem:
lemoer@orange ~> diff /usr/lib/python3.7/asyncio/base_events.py{.bak,}
--- /usr/lib/python3.7/asyncio/base_events.py.bak 2019-02-21
18:42:17.060122277 +0100
+++ /usr/lib/python3.7/asyncio/base_events.py 2019-02-21 18:49:36.886866750
+0100
@@ -942,8 +942,8 @@
sock = None
continue
if self._debug:
-logger.debug("connect %r to %r", sock, address)
-await self.sock_connect(sock, address)
+logger.debug("connect %r to %r", sock, (host, port))
+await self.sock_connect(sock, (host, port))
except OSError as exc:
if sock is not None:
sock.close()
------
components: asyncio
messages: 336253
nosy: Leonardo Mörlein, asvetlov, yselivanov
priority: normal
severity: normal
status: open
title: asyncio: create_connection cannot handle IPv6 link-local addresses
anymore (linux)
versions: Python 3.7
___
Python tracker
<https://bugs.python.org/issue36069>
___
___
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
