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Title: nntplib is not IPv6-capable
Type: behavior Stage:
Components: Library (Lib) Versions: Python 2.6
Status: closed Resolution: fixed
Dependencies: Superseder:
Assigned To: Nosy List: dmorr, giampaolo.rodola, morrowc, pitrou, vstinner
Priority: normal Keywords: patch

Created on 2007-12-19 20:07 by dmorr, last changed 2022-04-11 14:56 by admin. This issue is now closed.

File name Uploaded Description Edit
nntplib_ipv6.patch dmorr, 2007-12-19 20:07
Messages (17)
msg58822 - (view) Author: Derek Morr (dmorr) Date: 2007-12-19 20:07
nntplib hardcodes AF_INET for the socket address family. This prevents
it from using IPv6. Attached is a patch that converts NNTP.__init__() to
use socket.create_connection(), which is IPv6-capable.
msg78504 - (view) Author: Chris Morrow (morrowc) Date: 2008-12-30 04:51
This patch doesn't appear to work for python2.5.1 ->

Python 2.5.1 (r251:54863, Jun 15 2008, 18:24:51) 
[GCC 4.3.0 20080428 (Red Hat 4.3.0-8)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from nntplib import NNTP
>>> conn = NNTP('')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.5/", line 114, in __init__
    self.sock = socket.create_connection((host, port))
AttributeError: 'module' object has no attribute 'create_connection'

(at least for me it doesn't work...
Linux hostnamehere #1 SMP Fri Oct 17 14:52:14 EDT 
2008 i686 i686 i386 GNU/Linux)

I'd be happy to try something else, or debug in other ways it that'd 
help... This really ought to get fixed if possible.
msg78505 - (view) Author: Derek Morr (dmorr) Date: 2008-12-30 05:01
Yes. The patch is against 2.6. It uses the socket.create_connection() 
helper function, which was added in 2.6. See
rev=54546&view=rev for the commit message.

If you really want to apply it to 2.5, it's trivial to adapt the patch. 
Just replace the call to create_connection() with something like this:

    msg = "getaddrinfo returns an empty list"
    for res in getaddrinfo(host, port, 0, SOCK_STREAM):
        af, socktype, proto, canonname, sa = res
        sock = None
            sock = socket(af, socktype, proto)
            if timeout is not _GLOBAL_DEFAULT_TIMEOUT:
            self.sock = sock

        except error, msg:
            if sock is not None:

    raise error, msg
msg78506 - (view) Author: Chris Morrow (morrowc) Date: 2008-12-30 05:05
oh crap :( I saw the 2.6 AFTER I posted the message :( sorry. grr, have 
to find a fix for 2.5 I suppose now.

msg78507 - (view) Author: Chris Morrow (morrowc) Date: 2008-12-30 05:06
oy, and I'm not reading emails properly. I'll try the fix you propose 
for 2.5.
msg78508 - (view) Author: Chris Morrow (morrowc) Date: 2008-12-30 06:08
a possible fix for 2.5 is:

morrowc@tweezer:/tmp$ diff -U3
---     2008-12-30 01:06:14.000000000 -0500
+++  2008-12-30 01:07:33.000000000 -0500
@@ -109,8 +109,19 @@
         """ = host
         self.port = port
-        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-        self.sock.connect((, self.port))
+        msg = "getaddrinfo returns an empty list"
+        for res in socket.getaddrinfo(, self.port, 0, 
+          af, socktype, proto, canonname, sa = res
+          sock = None
+          try:
+            self.sock = socket.socket(af, socktype, proto)
+            self.sock.connect(sa)
+          except error, msg:
+            if self.sock is not None:
+                self.sock.close()
+            raise NNTPError, msg
         self.file = self.sock.makefile('rb')
         self.debugging = 0
         self.welcome = self.getresp()

I'll open a bug against 2.5 now with this.
msg78578 - (view) Author: STINNER Victor (vstinner) * (Python committer) Date: 2008-12-31 00:18
I like nntplib_ipv6.patch: it's a generic solution (may support 
address families other than IPv6) and reuse code 
(socket.create_connection()) is always a good thing :-)
msg78579 - (view) Author: STINNER Victor (vstinner) * (Python committer) Date: 2008-12-31 00:20
About Python 2.5: this branch doesn't accept bugfix anymore, only 
security issues. So only Python 2.6+ and 3.0+ can be patched.
msg78585 - (view) Author: Chris Morrow (morrowc) Date: 2008-12-31 01:10
Are we sure that the 2.6 fix (in the patch) will make it into 2.6? (and 
the right upstream patching will happen to the 3.0 code as well?)
msg78676 - (view) Author: Antoine Pitrou (pitrou) * (Python committer) Date: 2009-01-01 01:58
I was going to suggest writing a test but I see that nntplib hasn't got
a single unit test :-O
msg84845 - (view) Author: Derek Morr (dmorr) Date: 2009-03-31 17:40
Any chance of this being applied soon? It's been sitting in the 
bugtracker for over a year now.
msg84846 - (view) Author: STINNER Victor (vstinner) * (Python committer) Date: 2009-03-31 17:42
@dmorr: It would be faster if nntplib has some tests :-/
msg84847 - (view) Author: Derek Morr (dmorr) Date: 2009-03-31 17:48
I'm confused by that.

In order to apply a 3 line patch (which replaces one standard library 
function with another), you want an entire test suite written for 

If we're willing to accept that nttplib works reasonably well now, why 
is the testsuite necessary? socket.create_connection() is already used 
in several other modules.
msg85015 - (view) Author: Chris Morrow (morrowc) Date: 2009-04-01 14:28
This is a little silly and painful... it's utterly broken to hardcode
the AF type in this way, could we please apply a patch (something like
the proposed seems to work fine) and get this rolled into the next release? 

It seems really lame to not be able to support normal internet protocols
in a tools language.
msg85020 - (view) Author: Antoine Pitrou (pitrou) * (Python committer) Date: 2009-04-01 15:31
Assuming the patch does work, +1 for applying it.
msg87767 - (view) Author: Antoine Pitrou (pitrou) * (Python committer) Date: 2009-05-14 21:23
Your patch is committed in r72640. Thanks!
msg87775 - (view) Author: Derek Morr (dmorr) Date: 2009-05-14 22:25

Is there any chance of getting bug 1655 fixed as well? imaplib has the 
same issue as nntplib, and the patch is identical.
Date User Action Args
2022-04-11 14:56:29adminsetgithub: 46005
2009-05-14 22:25:27dmorrsetmessages: + msg87775
2009-05-14 21:23:38pitrousetstatus: open -> closed
resolution: fixed
messages: + msg87767
2009-04-01 15:31:07pitrousetmessages: + msg85020
2009-04-01 14:28:56morrowcsetmessages: + msg85015
2009-03-31 17:48:27dmorrsetmessages: + msg84847
2009-03-31 17:42:49vstinnersetmessages: + msg84846
2009-03-31 17:40:04dmorrsetmessages: + msg84845
2009-01-01 01:58:59pitrousetnosy: + pitrou
messages: + msg78676
2008-12-31 01:10:24morrowcsetmessages: + msg78585
2008-12-31 00:20:31vstinnersetmessages: + msg78579
2008-12-31 00:18:59vstinnersetnosy: + vstinner
messages: + msg78578
2008-12-30 06:08:48morrowcsetmessages: + msg78508
2008-12-30 05:06:35morrowcsetmessages: + msg78507
2008-12-30 05:05:16morrowcsetmessages: + msg78506
2008-12-30 05:01:57dmorrsetmessages: + msg78505
2008-12-30 04:51:25morrowcsetnosy: + morrowc
messages: + msg78504
2007-12-20 05:00:50christian.heimessetpriority: normal
keywords: + patch
2007-12-20 00:05:41giampaolo.rodolasetnosy: + giampaolo.rodola
2007-12-19 20:07:10dmorrcreate