Bug #76966 [NEW]: checkdnsrr function return inconsistent results

From: stephane at dubishere dot com Operating system: Ubuntu 18.04 PHP version: 7.2.10 Package: *General Issues Bug Type: Bug Bug description:checkdnsrr function return inconsistent results Description: ------------ --- From manual page: http://www.php.net/function.checkdnsrr --- Root issue: I'm having networking problems when setting up the session handler to use Redis. If I setup the session handler using an IP address pointing to my Redis host, it works fine. If I use a domain (DNS or my linux /etc/hosts file) it doesn't work, sessions are not saved in Redis. So i've started looking into some networking related function to test this behaviour and see if I could find a DNS-related issue somewhere, and here I've encountered weird results for checkdnsrr() function. Hopefully, fixing these would fix my Redis connection issue. Test script: --------------- /** In AWS using route53, I've set 2 DNS records: - one A record route53.myapp.com >> 10.1.1.101 - one CNAME record route666.myapp.com >> route53.myapp.com */ // >> control the OS/hosts is seeing the DNS records: var_dump( gethostbyname('route53.myapp.com')); >> 10.1.1.101 var_dump( gethostbyname('route666.myapp.com')); >> 10.1.1.101 // My first test: var_dump( checkdnsrr('route53.myapp.com', 'A')); >> true var_dump( checkdnsrr('route53.myapp.com')); >> false !!! ### If I have a A record, looking for ANY type of records should return true too. // My second test: var_dump( checkdnsrr('route666.myapp.com')); >> true var_dump( checkdnsrr('route666.myapp.com', 'A')); >> true !!! var_dump( checkdnsrr('route666.myapp.com', 'CNAME')); >> true ### If route666 is a CNAME, testing it's a A record should return false. -- Edit bug report at https://bugs.php.net/bug.php?id=76966&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=76966&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=76966&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=76966&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=76966&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=76966&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=76966&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=76966&r=needscript Try newer version: https://bugs.php.net/fix.php?id=76966&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=76966&r=support Expected behavior: https://bugs.php.net/fix.php?id=76966&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=76966&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=76966&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=76966&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=76966&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=76966&r=dst IIS Stability: https://bugs.php.net/fix.php?id=76966&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=76966&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=76966&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=76966&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=76966&r=mysqlcfg