[New-bugs-announce] [issue5004] socket.getfqdn() doesn't cope properly with purely DNS-based setups

[Daniel Frnake]

New submission from Daniel Frnake <dfranke at wellohorld.com>:

On Linux and presumably on other POSIX-like systems, socket.getfqdn()
doesn't work if a system resolves its own FQDN using DNS rather than
/etc/hosts.

My system's FQDN is 'fugue.tank.wellohorld.com'.  My /etc/hosts is empty
except for loopback entries, and /etc/resolv.conf contains the line
'domain tank.wellohorld.com'.  This is sufficient for 'hostname -f' to
do the Right Thing, but socket.getfqdn() simply returns 'fugue':

dfranke at fugue:~/Python-2.6.1$ hostname
fugue
dfranke at fugue:~/Python-2.6.1$ hostname -f
fugue.tank.wellohorld.com
dfranke at fugue:~/Python-2.6.1$ ./python
Python 2.6.1 (r261:67515, Jan 19 2009, 13:56:59)
[GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import socket
>>> socket.getfqdn()
'fugue'
>>>
dfranke at fugue:~/Python-2.6.1$ echo -e '$a\n172.17.0.120
fugue.tank.wellohorld.com fugue\n.\nwq' | sudo ed /etc/hosts
305
350
dfranke at fugue:~/Python-2.6.1$ ./python
Python 2.6.1 (r261:67515, Jan 19 2009, 13:56:59)
[GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import socket
>>> socket.getfqdn()
'fugue.tank.wellohorld.com'
>>>
dfranke at fugue:~/Python-2.6.1$

----------
components: Library (Lib)
messages: 80216
nosy: dfranke
severity: normal
status: open
title: socket.getfqdn() doesn't cope properly with purely DNS-based setups
type: behavior
versions: Python 2.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5004>
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