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From: "akshay.moghe+sourceware at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug network/11156] DNS name resolution issue when the answer does not allow recursion
Date: Fri, 13 Mar 2020 22:09:58 +0000 [thread overview]
Message-ID: <bug-11156-131-dKPbaiHbFS@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-11156-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=11156
--- Comment #6 from Akshay <akshay.moghe+sourceware at gmail dot com> ---
This issue seems to be due to underscores in the CNAME.
bash#> nslookup vcc.healthdirect.org.au
Server: 127.0.1.1
Address: 127.0.1.1#53
Non-authoritative answer:
vcc.healthdirect.org.au canonical name = _aliased.coviu.com.
_aliased.coviu.com canonical name =
production-ui-alb-975266950.ap-southeast-2.elb.amazonaws.com.
Name: production-ui-alb-975266950.ap-southeast-2.elb.amazonaws.com
Address: 52.65.119.14
Name: production-ui-alb-975266950.ap-southeast-2.elb.amazonaws.com
Address: 13.237.79.63
Now try resolving the canonical name:
akshay@spitfire:~$ nslookup _aliased.coviu.com
Server: 127.0.1.1
Address: 127.0.1.1#53
Non-authoritative answer:
_aliased.coviu.com canonical name =
production-ui-alb-975266950.ap-southeast-2.elb.amazonaws.com.
Name: production-ui-alb-975266950.ap-southeast-2.elb.amazonaws.com
Address: 13.237.79.63
Name: production-ui-alb-975266950.ap-southeast-2.elb.amazonaws.com
Address: 52.65.119.14
But try it thru libc
akshay@spitfire:~$ getent hosts _aliased.coviu.com
akshay@spitfire:~$
... returns nothing
So the root cause for the case I reported seems to be that underscores are not
liked by the getaddrinfo implementation?
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next prev parent reply other threads:[~2020-03-13 22:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-11156-131@http.sourceware.org/bugzilla/>
2011-02-04 1:30 ` [Bug libc/11156] " pasky at suse dot cz
2014-06-30 20:25 ` fweimer at redhat dot com
2020-03-13 7:17 ` akshay.moghe+sourceware at gmail dot com
2020-03-13 7:21 ` akshay.moghe+sourceware at gmail dot com
2020-03-13 7:25 ` [Bug network/11156] " fw at deneb dot enyo.de
2020-03-13 22:09 ` akshay.moghe+sourceware at gmail dot com [this message]
2020-03-14 7:31 ` fw at deneb dot enyo.de
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