8000 gh-100374: Fixed a bug in socket.getfqdn() by MTAwsl · Pull Request #100375 · python/cpython · GitHub
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gh-100374: Fixed a bug in socket.getfqdn() #100375

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Merged
merged 7 commits into from
Dec 21, 2022
Merged

gh-100374: Fixed a bug in socket.getfqdn() #100375

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77c52fc
Fixed a bug in socket.getfqdn()
MTAwsl Dec 20, 2022
34f6fa3
📜🤖 Added by blurb_it.
blurb-it[bot] Dec 20, 2022
7f5cd30
Merge branch 'main' into main
MTAwsl Dec 21, 2022
2034fab
Added test case for GH-100374.
MTAwsl Dec 21, 2022
c2fb7f6
Update Misc/NEWS.d/next/Core and Builtins/2022-12-20-16-14-19.gh-issu…
MTAwsl Dec 21, 2022
908cd68
Update Lib/socket.py with proper format
MTAwsl Dec 21, 2022
e9077fd
Merge branch 'main' into main
MTAwsl Dec 21, 2022
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Fixed a bug in socket.getfqdn() 
When getfqdn called with name "::", instead of returning gethostname(), it will call gethostbyaddr("::").
This will raise an exception "socket.herror: [Errno 1] Unknown host", which will cause a 30 seconds(timeout) delay and return incorrect result.
The solution is to add a filter to the first if statement, in line 792 socket.py.
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@MTAwsl
MTAwsl committed Dec 20, 2022
commit 77c52fc37b5670041bf2b22e3c1c3df29e6f1cfa
4 changes: 2 additions & 2 deletions Lib/socket.py
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Original file line number Diff line number Diff line change
Expand Up @@ -785,11 +785,11 @@ def getfqdn(name=''):

First the hostname returned by gethostbyaddr() is checked, then
possibly existing aliases. In case no FQDN is available and `name`
was given, it is returned unchanged. If `name` was empty or '0.0.0.0',
was given, it is returned unchanged. If `name` was empty, '0.0.0.0' or '::',
hostname from gethostname() is returned.
"""
name = name.strip()
if not name or name == '0.0.0.0':
if not name or name == '0.0.0.0' or name == '::':
name = gethostname()
try:
hostname, aliases, ipaddrs = gethostbyaddr(name)
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