Fixes as recommended in the PR discussion.

modules/exploits/multi/postgres/postgres_createlang.rb

@@ -53,7 +53,7 @@ class Metasploit4 < Msf::Exploit::Remote
     register_options([
       OptString.new('USERNAME', [true, 'The username to the service', 'postgres']),
       OptString.new('PASSWORD', [true, 'The password to the service', 'postgres'])
-    ], self.class)
+    ])
 
     deregister_options('SQL', 'RETURN_ROWSET', 'VERBOSE')
   end
@@ -69,13 +69,13 @@ class Metasploit4 < Msf::Exploit::Remote
         return CheckCode::Appears
 
       else
-        print_error "#{rhost}:#{rport} - Unsupported version - #{version[:auth]}"
+        print_error "#{peer} - Unsupported version - #{version[:auth]}"
         return CheckCode::Safe
       end
 
     else
-      print_error "#{rhost}:#{rport} - Authentication failed"
-      return CheckCode::Safe
+      print_error "#{peer} - Authentication failed"
+      return CheckCode::Unknown
     end
   end
 
@@ -105,7 +105,7 @@ class Metasploit4 < Msf::Exploit::Remote
 
     elsif major_version.to_i >= 9
       print_status "#{rhost}:#{rport} - Selecting version 9 attack"
-      extension = 'LANGUAGE'
+      extension = 'EXTENSION'
 
     else
       print_error "#{rhost}:#{rport} - Unsupported version - #{version}"
@@ -129,17 +129,17 @@ class Metasploit4 < Msf::Exploit::Remote
 
         case load_lang
           when :exists
-            print_good "#{rhost}:#{rport} - #{human_language} is already loaded, continuing"
+            print_good "#{rhost}:#{rport} - language is already loaded, continuing"
             create_function(language, func_name)
             loaded = true
 
           when :loaded
-            print_good "#{rhost}:#{rport} - #{human_language} was successfully loaded, continuing"
+            print_good "#{rhost}:#{rport} - language was successfully loaded, continuing"
             create_function(language, func_name)
             loaded = true
 
           when :not_exists
-            print_status "#{rhost}:#{rport} - #{human_language} could not be loaded"
+            print_status "#{rhost}:#{rport} - language could not be loaded"
 
           else
             print_error "#{rhost}:#{rport} - Error occurred"
@@ -171,9 +171,6 @@ class Metasploit4 < Msf::Exploit::Remote
         print_error "#{rhost}:#{rport} - Exploit failed"
         return false
       end
-
-    rescue RuntimeError => e
-      print_error "#{rhost}:#{rport} - Failed to create UDF: #{e.class}: #{e}"
     end
 
     postgres_logout if @postgres_conn
@@ -251,7 +248,7 @@ class Metasploit4 < Msf::Exploit::Remote
         return :noauth
       end
 
-    rescue Rex::ConnectionError, Rex::Post::Meterpreter::RequestError
+    rescue Rex::ConnectionError
       return :noconn
     end
   end