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clear /etc/resolv.conf cache on posix systems when reattempting connection #299

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clear /etc/resolv.conf cache on posix systems when reattempting connection #299

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11 changes: 11 additions & 0 deletions sleekxmpp/xmlstream/xmlstream.py
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,8 @@
import weakref
import uuid
import errno
import os
import ctypes

from xml.parsers.expat import ExpatError

Expand Down Expand Up @@ -477,6 +479,15 @@ def _connect(self, reattempt=True):
except SystemExit:
self.set_stop()
return False
if os.name is 'posix':
# libc caches /etc/resolv.conf. try to flush the cache, see https://github.com/fritzy/SleekXMPP/issues/298
try:
log.debug("flushing /etc/resolv.conf cache")
libc = ctypes.CDLL('libc.so.6')
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This will fail for FreeBSD 9.2, but will succeed if you specify just 'libc.so', but both variants will fail for FreeBSD 10 where 'libc.so.7' is needed. May be figure out some more solid solution to find out right 'lib.so'?

res_init = getattr(libc, '__res_init')
res_init(None)
except:
log.debug('Error calling libc.__res_init')

if self.default_domain:
try:
Expand Down