[Bug 1600000] [NEW] libnss-resolve treats two trailing dots on a domain name incorrectly

[Adam Conrad]

Public bug reported:

(base)adconrad at nosferatu:~$ getent ahostsv4 www.gnu.org..
208.118.235.148 STREAM wildebeest.gnu.org
208.118.235.148 DGRAM  
208.118.235.148 RAW    
(base)adconrad at nosferatu:~$ sudo sed -i -e 's/ resolve dns/ dns/' /etc/nsswitch.conf 
(base)adconrad at nosferatu:~$ getent ahostsv4 www.gnu.org..
(base)adconrad at nosferatu:~$ sudo sed -i -e 's/ dns/ resolve dns/' /etc/nsswitch.conf 
(base)adconrad at nosferatu:~$ getent ahostsv4 www.gnu.org..
208.118.235.148 STREAM wildebeest.gnu.org
208.118.235.148 DGRAM  
208.118.235.148 RAW    
(base)adconrad at nosferatu:~$ 

This is responsible for the new regression in glibc:

----------
FAIL: posix/tst-getaddrinfo5
original exit status 1
resolving "localhost." worked, proceeding to test
resolving "localhost.." failed, test passed
resolving "www.gnu.org." worked, proceeding to test
resolving "www.gnu.org.." worked, test failed
----------

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1600000

Title:
  libnss-resolve treats two trailing dots on a domain name incorrectly

Status in systemd package in Ubuntu:
  New

Bug description:
  (base)adconrad at nosferatu:~$ getent ahostsv4 www.gnu.org..
  208.118.235.148 STREAM wildebeest.gnu.org
  208.118.235.148 DGRAM  
  208.118.235.148 RAW    
  (base)adconrad at nosferatu:~$ sudo sed -i -e 's/ resolve dns/ dns/' /etc/nsswitch.conf 
  (base)adconrad at nosferatu:~$ getent ahostsv4 www.gnu.org..
  (base)adconrad at nosferatu:~$ sudo sed -i -e 's/ dns/ resolve dns/' /etc/nsswitch.conf 
  (base)adconrad at nosferatu:~$ getent ahostsv4 www.gnu.org..
  208.118.235.148 STREAM wildebeest.gnu.org
  208.118.235.148 DGRAM  
  208.118.235.148 RAW    
  (base)adconrad at nosferatu:~$ 

  This is responsible for the new regression in glibc:

  ----------
  FAIL: posix/tst-getaddrinfo5
  original exit status 1
  resolving "localhost." worked, proceeding to test
  resolving "localhost.." failed, test passed
  resolving "www.gnu.org." worked, proceeding to test
  resolving "www.gnu.org.." worked, test failed
  ----------

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