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* [Bug nss/28700] New: "dns [!UNAVAIL=return] files" default for hosts database is not useful
@ 2021-12-15 18:03 fweimer at redhat dot com
2021-12-15 18:04 ` [Bug nss/28700] " fweimer at redhat dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: fweimer at redhat dot com @ 2021-12-15 18:03 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28700
Bug ID: 28700
Summary: "dns [!UNAVAIL=return] files" default for hosts
database is not useful
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: nss
Assignee: unassigned at sourceware dot org
Reporter: fweimer at redhat dot com
Target Milestone: ---
It is common to add localhost to /etc/hosts because the name does not exist in
the DNS, but is commonly used as a host name.
With the built-in "dns [!UNAVAIL=return] files" default, dns is searched first
and provides an answer for "localhost" (NXDOMAIN). We never look at the files
database as a result, so the contents of /etc/hosts is ignored.
This means that the built-in hosts database default is not very useful, it
should be "files dns", which is what most distributions use in their
/etc/nsswitch.conf files.
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* [Bug nss/28700] "dns [!UNAVAIL=return] files" default for hosts database is not useful
2021-12-15 18:03 [Bug nss/28700] New: "dns [!UNAVAIL=return] files" default for hosts database is not useful fweimer at redhat dot com
@ 2021-12-15 18:04 ` fweimer at redhat dot com
2021-12-15 18:34 ` fweimer at redhat dot com
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: fweimer at redhat dot com @ 2021-12-15 18:04 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28700
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at sourceware dot org |fweimer at redhat dot com
CC| |fweimer at redhat dot com
Status|NEW |ASSIGNED
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* [Bug nss/28700] "dns [!UNAVAIL=return] files" default for hosts database is not useful
2021-12-15 18:03 [Bug nss/28700] New: "dns [!UNAVAIL=return] files" default for hosts database is not useful fweimer at redhat dot com
2021-12-15 18:04 ` [Bug nss/28700] " fweimer at redhat dot com
@ 2021-12-15 18:34 ` fweimer at redhat dot com
2021-12-15 19:31 ` fweimer at redhat dot com
2021-12-17 11:12 ` fweimer at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: fweimer at redhat dot com @ 2021-12-15 18:34 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28700
--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
Patch posted:
[PATCH] nss: Use "files dns" as the default for the hosts database (bug 28700)
https://sourceware.org/pipermail/libc-alpha/2021-December/134207.html
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* [Bug nss/28700] "dns [!UNAVAIL=return] files" default for hosts database is not useful
2021-12-15 18:03 [Bug nss/28700] New: "dns [!UNAVAIL=return] files" default for hosts database is not useful fweimer at redhat dot com
2021-12-15 18:04 ` [Bug nss/28700] " fweimer at redhat dot com
2021-12-15 18:34 ` fweimer at redhat dot com
@ 2021-12-15 19:31 ` fweimer at redhat dot com
2021-12-17 11:12 ` fweimer at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: fweimer at redhat dot com @ 2021-12-15 19:31 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28700
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://bugzilla.redhat.com
| |/show_bug.cgi?id=2033020
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* [Bug nss/28700] "dns [!UNAVAIL=return] files" default for hosts database is not useful
2021-12-15 18:03 [Bug nss/28700] New: "dns [!UNAVAIL=return] files" default for hosts database is not useful fweimer at redhat dot com
` (2 preceding siblings ...)
2021-12-15 19:31 ` fweimer at redhat dot com
@ 2021-12-17 11:12 ` fweimer at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: fweimer at redhat dot com @ 2021-12-17 11:12 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28700
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |2.35
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
Fixed for glibc 2.35 via:
commit b99b0f93ee8762fe53ff65802deb6f00700b9924
Author: Florian Weimer <fweimer@redhat.com>
Date: Fri Dec 17 12:01:20 2021 +0100
nss: Use "files dns" as the default for the hosts database (bug 28700)
This matches what is currently in nss/nsswitch.conf. The new ordering
matches what most distributions use in their installed configuration
files.
It is common to add localhost to /etc/hosts because the name does not
exist in the DNS, but is commonly used as a host name.
With the built-in "dns [!UNAVAIL=return] files" default, dns is
searched first and provides an answer for "localhost" (NXDOMAIN).
We never look at the files database as a result, so the contents of
/etc/hosts is ignored. This means that "getent hosts localhost"
fail without a /etc/nsswitch.conf file, even though the host name
is listed in /etc/hosts.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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2021-12-15 18:03 [Bug nss/28700] New: "dns [!UNAVAIL=return] files" default for hosts database is not useful fweimer at redhat dot com
2021-12-15 18:04 ` [Bug nss/28700] " fweimer at redhat dot com
2021-12-15 18:34 ` fweimer at redhat dot com
2021-12-15 19:31 ` fweimer at redhat dot com
2021-12-17 11:12 ` fweimer at redhat dot com
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