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includes/discovery/storage/datadomain.inc.php (2 issues)

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<?php
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/*
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 * This program is free software: you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License as published by the
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 * Free Software Foundation, either version 3 of the License, or (at your
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 * option) any later version.  Please see LICENSE.txt at the top level of
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 * the source code distribution for details.
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 * @package    LibreNMS

            


            
                                                                                                            
                            
            
                                    
            
            

                
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 * @link       https://www.librenms.org

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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 * @copyright  2019 ACL

            


            
                                                                        
                            
            
                                    
            
            

                
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 * @author     Abel Laura <[email protected]>

            


            
                                                                        
                            
            
                                    
            
            

                
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*/

            


            
                                                                        
                            
            
                                    
            
            

                
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$ddos_storage = snmpwalk_cache_oid($device, 'fileSystemSpaceTable', null, 'DATA-DOMAIN-MIB', 'datadomain');

            


                            

                    
                        
                    
                    
                    
                    
                                                                                                    
                        

                            
                            
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            Bug
    
    
    
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Are you sure the assignment to $ddos_storage is correct as snmpwalk_cache_oid($devi...AIN-MIB', 'datadomain') seems to always return null.
                                                                                                                                                    

                    
                                            

                            

                            

                                
                                    
                                
                            


                            
This check looks for function or method calls that always return null and whose
return value is assigned to a variable.


class A
{
    function getObject()
    {
        return null;
    }

}

$a = new A();
$object = $a->getObject();





The method getObject() can return nothing but null, so it makes no sense
to assign that value to a variable.


The reason is most likely that a function or method is imcomplete or has been
reduced for debug purposes.


                        

                                                    

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if (is_array($ddos_storage)) {

            


                            

                    
                        
                    
                    
                    
                    
                                                                                                    
                        

                            
                            
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The condition is_array($ddos_storage) is always false.
                                                                                                                                                                                                        

                    
                                                    

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    foreach ($ddos_storage as $index => $storage) {

            


            
                                                                        
                            
            
                                    
            
            

                
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        $fstype = $storage['fileSystemResourceTier'];

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $descr = $storage['fileSystemResourceName'];

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $units = 1073741824;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $total = $storage['fileSystemSpaceSize'] * $units;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $used = $storage['fileSystemSpaceUsed'] * $units;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        if ($descr == '/data: post-comp') {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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            discover_storage($valid_storage, $device, $index, $fstype, 'datadomain', $descr, $total, $units, $used);

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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}

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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unset($fstype, $descr, $total, $used, $units, $ddos_storage);

            


            
                                                        
            
                                    
            
            

                
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