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* [Bug libc/26977] New: getaddrinfo does not handle the hosts file correctly
@ 2020-11-29 21:28 bugs at jth dot net
2020-11-29 21:29 ` [Bug libc/26977] " bugs at jth dot net
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: bugs at jth dot net @ 2020-11-29 21:28 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26977
Bug ID: 26977
Summary: getaddrinfo does not handle the hosts file correctly
Product: glibc
Version: 2.32
Status: UNCONFIRMED
Keywords: glibc_2.32
Severity: normal
Priority: P2
Component: libc
Assignee: unassigned at sourceware dot org
Reporter: bugs at jth dot net
CC: drepper.fsp at gmail dot com
Target Milestone: 2.32
Host: Linux Fedora 33
On a dual stack IP4 + IP6 server the 2.32 release has introduced a problem of
getaddrinfo omitting looking up the IP6 address in the DNS in case the IP4
address is found in the hosts file or vice versa.
After upgrading 'ping -6 IP6.HOST' suddenly failed by "Address family for
hostname not supported" and the monitoring software reported downtime.
Similarly for the dig command.
A test program for getaddrinfo verified the changed behaviour.
Only after entering the IP6 address into or deleting the IP4 address from the
hosts file the old behaviour was restored.
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* [Bug libc/26977] getaddrinfo does not handle the hosts file correctly
2020-11-29 21:28 [Bug libc/26977] New: getaddrinfo does not handle the hosts file correctly bugs at jth dot net
@ 2020-11-29 21:29 ` bugs at jth dot net
2020-11-29 21:51 ` bugs at jth dot net
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: bugs at jth dot net @ 2020-11-29 21:29 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26977
Joergen Thomsen <bugs at jth dot net> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |bugs at jth dot net
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* [Bug libc/26977] getaddrinfo does not handle the hosts file correctly
2020-11-29 21:28 [Bug libc/26977] New: getaddrinfo does not handle the hosts file correctly bugs at jth dot net
2020-11-29 21:29 ` [Bug libc/26977] " bugs at jth dot net
@ 2020-11-29 21:51 ` bugs at jth dot net
2020-11-30 11:47 ` fweimer at redhat dot com
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: bugs at jth dot net @ 2020-11-29 21:51 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26977
--- Comment #1 from Joergen Thomsen <bugs at jth dot net> ---
This is probably not related to the AI_ADDRCONFIG flag as the test program
used these parameters
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_CANONNAME;
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* [Bug libc/26977] getaddrinfo does not handle the hosts file correctly
2020-11-29 21:28 [Bug libc/26977] New: getaddrinfo does not handle the hosts file correctly bugs at jth dot net
2020-11-29 21:29 ` [Bug libc/26977] " bugs at jth dot net
2020-11-29 21:51 ` bugs at jth dot net
@ 2020-11-30 11:47 ` fweimer at redhat dot com
2020-11-30 13:13 ` bugs at jth dot net
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: fweimer at redhat dot com @ 2020-11-30 11:47 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26977
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fweimer at redhat dot com
Ever confirmed|0 |1
Last reconfirmed| |2020-11-30
Status|UNCONFIRMED |WAITING
--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
Do you use systemd-resolved? Thanks.
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* [Bug libc/26977] getaddrinfo does not handle the hosts file correctly
2020-11-29 21:28 [Bug libc/26977] New: getaddrinfo does not handle the hosts file correctly bugs at jth dot net
` (2 preceding siblings ...)
2020-11-30 11:47 ` fweimer at redhat dot com
@ 2020-11-30 13:13 ` bugs at jth dot net
2020-11-30 13:34 ` bugs at jth dot net
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: bugs at jth dot net @ 2020-11-30 13:13 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26977
--- Comment #3 from Joergen Thomsen <bugs at jth dot net> ---
(In reply to Florian Weimer from comment #2)
> Do you use systemd-resolved? Thanks.
Apparently as the systemd-resolved service is running, but after stopping the
service no change in behaviour was observed.
Only by changing /etc/nsswitch.conf between the two lines below I observed a
change
hosts: files dns incorrect behaviour
hosts: dns correct
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* [Bug libc/26977] getaddrinfo does not handle the hosts file correctly
2020-11-29 21:28 [Bug libc/26977] New: getaddrinfo does not handle the hosts file correctly bugs at jth dot net
` (3 preceding siblings ...)
2020-11-30 13:13 ` bugs at jth dot net
@ 2020-11-30 13:34 ` bugs at jth dot net
2020-11-30 13:36 ` fweimer at redhat dot com
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: bugs at jth dot net @ 2020-11-30 13:34 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26977
--- Comment #4 from Joergen Thomsen <bugs at jth dot net> ---
My usage case is this:
In some cases it is important to overrule the DNS IP address by a temporary
address in the /etc/hosts file without changing the DNS.
This should not need any other entries in the /etc/hosts file than the
temporary ones.
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* [Bug libc/26977] getaddrinfo does not handle the hosts file correctly
2020-11-29 21:28 [Bug libc/26977] New: getaddrinfo does not handle the hosts file correctly bugs at jth dot net
` (4 preceding siblings ...)
2020-11-30 13:34 ` bugs at jth dot net
@ 2020-11-30 13:36 ` fweimer at redhat dot com
2020-11-30 13:37 ` [Bug network/26977] " fweimer at redhat dot com
2020-11-30 14:02 ` bugs at jth dot net
7 siblings, 0 replies; 9+ messages in thread
From: fweimer at redhat dot com @ 2020-11-30 13:36 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26977
--- Comment #5 from Florian Weimer <fweimer at redhat dot com> ---
I would like to see your test program for getaddrinfo. Thanks.
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* [Bug network/26977] getaddrinfo does not handle the hosts file correctly
2020-11-29 21:28 [Bug libc/26977] New: getaddrinfo does not handle the hosts file correctly bugs at jth dot net
` (5 preceding siblings ...)
2020-11-30 13:36 ` fweimer at redhat dot com
@ 2020-11-30 13:37 ` fweimer at redhat dot com
2020-11-30 14:02 ` bugs at jth dot net
7 siblings, 0 replies; 9+ messages in thread
From: fweimer at redhat dot com @ 2020-11-30 13:37 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26977
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|libc |network
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* [Bug network/26977] getaddrinfo does not handle the hosts file correctly
2020-11-29 21:28 [Bug libc/26977] New: getaddrinfo does not handle the hosts file correctly bugs at jth dot net
` (6 preceding siblings ...)
2020-11-30 13:37 ` [Bug network/26977] " fweimer at redhat dot com
@ 2020-11-30 14:02 ` bugs at jth dot net
7 siblings, 0 replies; 9+ messages in thread
From: bugs at jth dot net @ 2020-11-30 14:02 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=26977
--- Comment #6 from Joergen Thomsen <bugs at jth dot net> ---
Created attachment 13009
--> https://sourceware.org/bugzilla/attachment.cgi?id=13009&action=edit
getaddrinfo test program
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end of thread, other threads:[~2020-11-30 14:02 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
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2020-11-29 21:28 [Bug libc/26977] New: getaddrinfo does not handle the hosts file correctly bugs at jth dot net
2020-11-29 21:29 ` [Bug libc/26977] " bugs at jth dot net
2020-11-29 21:51 ` bugs at jth dot net
2020-11-30 11:47 ` fweimer at redhat dot com
2020-11-30 13:13 ` bugs at jth dot net
2020-11-30 13:34 ` bugs at jth dot net
2020-11-30 13:36 ` fweimer at redhat dot com
2020-11-30 13:37 ` [Bug network/26977] " fweimer at redhat dot com
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