Test Name: dns-reverse-lookup
Author: Eduard Benes <ebenes@redhat.com>
Location: /CoreOS/audit/Sanity/dns-reverse-lookup

Short Description: Empty addr parameter to audit logging function should cause 
to bypass reverse dns lookup.


Long Description:

If the addr parameter being passed to an audit logging function (such as 
audit_log_user_message) is "", it should bypass a reverse dns lookup. 
This can be verified by stracing this program: 

#include <libaudit.h> 
int main(void) { 
  int fd = audit_open(); 
  audit_log_user_message(fd, AUDIT_USER_AUTH, "", NULL, "", NULL, 1); 
  return 0; 
} 

Stracing this program will give much more than ~40 lines of output if 
dns reverse lookup has been performed. Number around 40 is acceptable.