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Bug 1973030 - [perl-net-ping] wrong return value on failing DNS name lookup
Summary: [perl-net-ping] wrong return value on failing DNS name lookup
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: perl
Version: 8.4
Hardware: Unspecified
OS: Unspecified
Target Milestone: beta
: ---
Assignee: perl-maint-list
QA Contact: Martin Kyral
Depends On:
Blocks: 1973176 1973177
TreeView+ depends on / blocked
Reported: 2021-06-17 07:05 UTC by Stefan Meyer
Modified: 2021-11-10 09:27 UTC (History)
2 users (show)

Fixed In Version: perl-5.26.3-420.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1973176 1973177 (view as bug list)
Last Closed: 2021-11-09 19:51:30 UTC
Type: Bug
Target Upstream Version:

Attachments (Terms of Use)
Replace croak by carp (3.02 KB, patch)
2021-06-17 10:08 UTC, Jitka Plesnikova
no flags Details | Diff
Fix _resolv return value (1.69 KB, patch)
2021-06-17 10:09 UTC, Jitka Plesnikova
no flags Details | Diff

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2021:4459 0 None None None 2021-11-09 19:51:34 UTC

Description Stefan Meyer 2021-06-17 07:05:55 UTC
Description of problem:
The perl-net-ping module delivers the wrong return value on failing DNS name lookup

Version-Release number of selected component (if applicable):
- Tested with perl-Net-Ping-2.55-419.el8.noarch in RHEL 8.4
- Found by a customer on RHEL 8.2

How reproducible:
- With non-existing dns hosts

Steps to Reproduce:
1. install perl-Net-Ping-2.55-419.el8.noarch
2. create example perl script:
   use Net::Ping;
   $ping = Net::Ping->new('tcp');
   $result = $ping->ping('blah.example.com'); # host does not exist in DNS.
   if (defined $result && $result)
      { print "OK\n"; }
      { print "ERROR\n"; }

3. run script

Actual results:
Error message is displayed:
getaddrinfo(blah.lnx.aaxc.org,,AF_INET) failed - Name or service not known at test.pl line 3.

Expected results:
The output should be "ERROR"

Additional info:
Looks like this has been fixed upstream: https://metacpan.org/dist/Net-Ping/changes (line 60)

2.68  Wed Jun 27 11:55:06 CEST 2018 (rurban)
       - Fixed _resolv return value on failing DNS name lookup. (GH #12 nlv02636)

Comment 2 Jitka Plesnikova 2021-06-17 07:39:10 UTC
Thank you for report. I can confirm the issue.

perl-Net-Ping is subpackage of perl.

Comment 3 Jitka Plesnikova 2021-06-17 08:50:53 UTC
These two changes has to be backported to solve the issue. 

2.68  Wed Jun 27 11:55:06 CEST 2018 (rurban)
       - Fixed _resolv return value on failing DNS name lookup. (GH #12 nlv02636)

2.67  Mon Jun 25 18:10:42 CEST 2018 (rurban)
       - Change croak on failing name lookup to return undef,
         matching the documentation.
         Fixes the regression from 2.43, RT #124830

After the fix, final result of the reproducer will be:
# perl bz1973030.pl 
getaddrinfo(blah.example.com,,AF_INET) failed - Name or service not known at /usr/share/perl5/Net/Ping.pm line 1861.

Comment 4 Jitka Plesnikova 2021-06-17 10:08:10 UTC
Created attachment 1791764 [details]
Replace croak by carp

Comment 5 Jitka Plesnikova 2021-06-17 10:09:12 UTC
Created attachment 1791765 [details]
Fix _resolv return value

Comment 13 errata-xmlrpc 2021-11-09 19:51:30 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (perl bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.


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