Bug 1793332

Summary: dig and nslookup stopped using IDN on output by default when not run in tty
Product: Red Hat Enterprise Linux 8 Reporter: Robin Hack <rhack>
Component: bindAssignee: Petr Menšík <pemensik>
Status: CLOSED WONTFIX QA Contact: qe-baseos-daemons
Severity: medium Docs Contact:
Priority: medium    
Version: 8.2CC: thozza
Target Milestone: rcKeywords: Patch, Regression
Target Release: 8.0   
Hardware: Unspecified   
OS: Unspecified   
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Last Closed: 2020-01-22 14:40:08 UTC Type: Bug
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Description Robin Hack 2020-01-21 07:02:57 UTC
Description of problem:
Different output of dig is provided when different destination (terminal vs non-terminal) are used and IDN is in game.

Version-Release number of selected component (if applicable):
bind-9.11.13-2.el8.x86_64
bind-utils-9.11.13-2.el8.x86_64

How reproducible:
always

Steps to Reproduce (please use attached test which are able to reproduce this):
1. Set up domain with IDN
zone "xn--mnchen-3ya.test" IN {
        type master;
        file "named.localhost";
        allow-update { none; };
};

2. 
# no redirection - I received münchen
$ dig @localhost xn--mnchen-3ya.test
...
münchen.test.		86400	IN	A	127.0.0.1
...

3.
# note redirection to pipe and then pass to grep
$ dig @localhost xn--mnchen-3ya.test | grep test
...
xn--mnchen-3ya.test.	86400	IN	A	127.0.0.1
...

Actual results:
Please, review steps for reproduce or use attached test.

Expected results:
I believe that output should be same 

Additional info:

Comment 1 Tomáš Hozza 2020-01-21 16:31:02 UTC
This was intentional change of behavior in upstream by:
https://gitlab.isc.org/isc-projects/bind9/merge_requests/984

The change is that when dig and nslookup detect that the stdout is not tty, it disables IDN output, unless +idnout is specified.

Comment 3 Tomáš Hozza 2020-01-22 14:40:08 UTC
After discussion with CEE and QE, we decided to keep the current upstream behavior and document the change in Release Notes.