Add several DNS-related facts by parsing /etc/resolv.conf

Facts include nameservers, domain, search path, sortlist, and options.

lib/ansible/module_utils/facts.py

@@ -151,6 +151,7 @@ class Facts(object):
             self.get_user_facts()
             self.get_local_facts()
             self.get_env_facts()
+            self.get_dns_facts()
 
     def populate(self):
         return self.facts
@@ -632,6 +633,37 @@ class Facts(object):
         for k,v in os.environ.iteritems():
             self.facts['env'][k] = v
 
+    def get_dns_facts(self):
+        self.facts['dns'] = {}
+        for line in get_file_lines('/etc/resolv.conf'):
+            if line.startswith('#') or line.startswith(';') or line.strip() == '':
+                continue
+            tokens = line.split()
+            if len(tokens) == 0:
+                continue
+            if tokens[0] == 'nameserver':
+                self.facts['dns']['nameservers'] = []
+                for nameserver in tokens[1:]:
+                    self.facts['dns']['nameservers'].append(nameserver)
+            elif tokens[0] == 'domain':
+                self.facts['dns']['domain'] = tokens[1]
+            elif tokens[0] == 'search':
+                self.facts['dns']['search'] = []
+                for suffix in tokens[1:]:
+                    self.facts['dns']['search'].append(suffix)
+            elif tokens[0] == 'sortlist':
+                self.facts['dns']['sortlist'] = []
+                for address in tokens[1:]:
+                    self.facts['dns']['sortlist'].append(address)
+            elif tokens[0] == 'options':
+                self.facts['dns']['options'] = {}
+                for option in tokens[1:]:
+                    option_tokens = option.split(':', 1)
+                    if len(option_tokens) == 0:
+                        continue
+                    val = len(option_tokens) == 2 and option_tokens[1] or True
+                    self.facts['dns']['options'][option_tokens[0]] = val
+
 class Hardware(Facts):
     """
     This is a generic Hardware subclass of Facts.  This should be further