Bug #74287 [Com]: DNS Resolution appears broken with recent Ubuntu update

Edit report at https://bugs.php.net/bug.php?id=74287&edit=1

 ID:                 74287
 Comment by:         alex at 1200wd dot com
 Reported by:        jndockery at gmail dot com
 Summary:            DNS Resolution appears broken with recent Ubuntu
                     update
 Status:             Open
 Type:               Bug
 Package:            Network related
 Operating System:   Ubuntu 14.04.5 LTS
 PHP Version:        5.6.30
 Block user comment: N
 Private report:     N

 New Comment:

For people like me that happened to stumble on this:

Checking my apt logs the following packages were updated at that time:

- libxml2
- libc-bin

This happened on an ubuntu 16.04 server with php7.


Previous Comments:
------------------------------------------------------------------------
[2017-03-22 10:33:52] spam2 at rhsoft dot net

sorry, but i don't get how ideas like "oh, my distribution updated libc and something broke, i will report a bug on the victims upstream bugtracker" are growing

------------------------------------------------------------------------
[2017-03-21 22:46:11] [email protected]

@rhsoft: It would be much appreciated if you could tone down your comments a bit. They are commonly passive aggressive, sometimes downright rude and contribute to a somewhat unpleasant atmosphere on this bug tracker.

------------------------------------------------------------------------
[2017-03-21 21:55:14] spam2 at rhsoft dot net

and why don't you write a bugreport on the ubuntu bugtracker instead upstream? most likely some library update broke the PHP installation - both is from ubuntu and PHP 5.6 is more or less EOL at all

and another question: who does "automated updates" and then complains at upstream bugtrackers that some unattended downstream stuff broke whatever?

------------------------------------------------------------------------
[2017-03-21 21:33:07] jndockery at gmail dot com

Description:
------------
After an automated update, PHP appears unable to resolve DNS entries

 - Other commands still resolve properly: ping, telnet, ldapsearch, curl
 - Affected 3 services on separate servers
 - Servers without unattended-upgrades (updated 2017-03-17) still functioning
 - Adding a manual entry in /etc/hosts allows DNS resolution

Affected service examples:
 - ldap_bind(): "Can't contact LDAP server"
 - PHP curl: "Could not resolve host: ..."
 - SMTP: "Connection could not be established with host smtp.sendgrid.net"

Packages recently updated:

 - libgnutls-openssl27:amd64
 - multiarch-support:amd64
 - libfreetype6:amd64
 - libc-dev-bin:amd64
 - libc-bin:amd64
 - libc6:amd64
 - libgnutls26:amd64
 - libc6-dev:amd64

Start-Date: 2017-03-21  06:31:17
Upgrade: libgnutls-openssl27:amd64 (2.12.23-12ubuntu2.6, 2.12.23-12ubuntu2.7), multiarch-support:amd64 (2.19-0ubuntu6.9, 2.19-0ubuntu6.10), libfreetype6:amd64 (2.5.2-1ubuntu2.5, 2.5.2-1ubuntu2.6), libc-dev-bin:amd64 (2.19-0ubuntu6.9, 2.19-0ubuntu6.10), libc-bin:amd64 (2.19-0ubuntu6.9, 2.19-0ubuntu6.10), libc6:amd64 (2.19-0ubuntu6.9, 2.19-0ubuntu6.10), libgnutls26:amd64 (2.12.23-12ubuntu2.6, 2.12.23-12ubuntu2.7), libc6-dev:amd64 (2.19-0ubuntu6.9, 2.19-0ubuntu6.10)
End-Date: 2017-03-21  06:31:22


Thank you!


Test script:
---------------
<?
  $url = "http://$_SERVER[HTTP_HOST]";
  $ch = curl_init();
  curl_setopt($ch,CURLOPT_URL,$url);
  curl_exec($ch);
  print_r(curl_error($ch));
  curl_close($ch);


Expected result:
----------------
no output

Actual result:
--------------
Could not resolve host: example.example.com


------------------------------------------------------------------------



--
Edit this bug report at https://bugs.php.net/bug.php?id=74287&edit=1