MINIMALITE

Use netstat to find which process is listening upon a port

Admin — Tue, 04 Dec 2012 11:48:42 +0000

If you want to know which process is listening upon a port you can use netstat command (that shows also the udp sockets) with the following parameters:

netstat --tcp --udp --listening --program

Or:

netstat -tupl

Example output:

The post Use netstat to find which process is listening upon a port appeared first on MINIMALITE.

PHP Function To Include Trailing Character

Admin — Tue, 20 Nov 2012 23:27:05 +0000

Simple PHP function used to add the trailing character:

function includeTrailingCharacter($string, $character)
{
    if (strlen($string) > 0) {
        if (substr($string, -1) !== $character) {
            return $string . $character;
        } else {
            return $string;
        }
    } else {
        return $character;
    }
}

Example usage:

$string = "/path/to/file"
$string = includeTrailingCharacter( $string, "/" );
echo $string;

Output:

/path/to/file/

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Free Network Tools with Toolsvoid.com

Admin — Mon, 19 Nov 2012 00:39:42 +0000

I highly recommend a free service that has a lot of online network tools useful for website owners, webmasters and system administrators, that include IP address lookup, domain to IP address, HTML page source viewer, unshorten shortened URLs, DNS records, etc.

http://www.toolsvoid.com/

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Add Page Attributes Menu Order to Custom Post Type

Admin — Sat, 17 Nov 2012 23:58:36 +0000

You may want to allow your clients to be able to set the order of specific custom post types, such as slider images. To do this you just need to add page-attributes in the supports array:

	$supports = array(
        'title',
        'editor',
        'excerpt',
	'thumbnail',
        'page-attributes', /* Add Parent + Menu Order to order showing of posts */
	);

If you want to remove the Parent option, just set:

'hierarchical' => false, /* Remove Parent from Page Attributes */

Additional Tips

Assuming the custom post type is named “shops”.

Add the order column to the admin listing screen for header text:

function add_new_shops_column($shops_columns) {
  $shops_columns['menu_order'] = "Order";
  return $shops_columns;
}
add_action('manage_edit-shops_columns', 'add_new_shops_column');

Show custom order column values:

function show_order_column_on_shops($name){
  global $post;
 
  switch ($name) {
    case 'menu_order':
      $order = $post->menu_order;
      echo $order;
      break;
   default:
      break;
   }
}
add_action('manage_shops_posts_custom_column','show_order_column_on_shops');

Make the column sortable:

function order_column_register_sortable_on_shops($columns){
  $columns['menu_order'] = 'menu_order';
  return $columns;
}
add_filter('manage_edit-shops_sortable_columns','order_column_register_sortable_on_shops');

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How To Solve Activation Issue with XenCenter Server

Admin — Thu, 08 Nov 2012 15:43:34 +0000

If you use XenCenter for Microsoft Windows to manage your Virtual Machines and you cannot activate the license of your server, I would recommend you to look at the log file that is located here:

C:\Users\\AppData\Roaming\Citrix\XenCenter\logs\XenCenter.log

An example of error message saved:

2012-05-29 10:04:37,767 INFO  Audit [3388] - Operation success: ActivationRequestAction: : Completed
2012-05-29 10:04:37,814 DEBUG XenAdmin.Program [3388] - Exception while opening url https://activate.vmd.citrix.com/index.html?transactionID=:
System.ComponentModel.Win32Exception: Access is denied
   at System.Diagnostics.Process.StartWithShellExecuteEx(ProcessStartInfo startInfo)
   at System.Diagnostics.Process.Start()
   at System.Diagnostics.Process.Start(ProcessStartInfo startInfo)
   at System.Diagnostics.Process.Start(String fileName)
   at XenAdmin.Program.OpenURL(String url)

In this case, you just need to visit in the web browser this link:

https://activate.vmd.citrix.com/index.html?transactionID=

The post How To Solve Activation Issue with XenCenter Server appeared first on MINIMALITE.

Download First N Bytes with cURL in PHP

Admin — Sun, 04 Nov 2012 00:44:50 +0000

To download a range of bytes with cURL we can use:

curl_setopt($ch, CURLOPT_RANGE, '0-500');

But if a server ignores the header, cURL will download all the file.
To solve this problem we can use a callback function:

function my_custom_download_callback($ch, $chunk) { 
  static $content = ''; //default value is empty
  static $bytes_limit = 500; // limit to get only 500 bytes
 
  $len = strlen($content) + strlen($chunk);
  if ($len >= $bytes_limit ) {
    $content .= substr($chunk, 0, $bytes_limit-strlen($content));
    return $content;
  }
 
  $content .= $chunk;
  return strlen($chunk);
}

We will use the above callback function with CURLOPT_WRITEFUNCTION:

function my_custom_download( $url )
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Your User Agent Here');
    curl_setopt($ch, CURLOPT_RANGE, '0-500'); //Limit the bytes to receive
    curl_setopt($ch, CURLOPT_BUFFERSIZE, 500); //Buffer size you want to read on each call
    curl_setopt($ch, CURLOPT_BINARYTRANSFER, true); //Enable BINARYTRANSFER
    curl_setopt($ch, CURLOPT_WRITEFUNCTION, 'my_custom_download_callback'); //Callback to our function
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    $output = curl_exec($ch);
    $bytes = my_custom_download_callback(null, null);
    curl_close($ch);
    return $bytes;
}

Example usage:

print_r( my_custom_download( "http://www.php.net/" ) );

As output the script will print the first 500 bytes.

The post Download First N Bytes with cURL in PHP appeared first on MINIMALITE.

Delphi function GetComputerSID

Admin — Sun, 28 Oct 2012 19:08:16 +0000

Useful function to get the SID (Security Identifier) in Windows Operating Systems. This function can be used, for example, to query HKEY_USERS for a specific logged-in user, example:

HKEY_USERS\S-1-5-21-0123456789-012345678-0123456000-1003
HKEY_USERS\S-1-5-21-0123456789-012345678-0123456000-1003_Classes

Function source code:

{$APPTYPE CONSOLE}
 
uses
  Windows,
  SysUtils;
 
 
function ConvertSidToStringSid(Sid: PSID; out StringSid: PChar): BOOL; stdcall;  external 'ADVAPI32.DLL' name {$IFDEF UNICODE} 'ConvertSidToStringSidW'{$ELSE} 'ConvertSidToStringSidA'{$ENDIF};
 
function SIDToString(ASID: PSID): string;
var
  StringSid : PChar;
begin
  ConvertSidToStringSid(ASID, StringSid);
  Result := string(StringSid);
end;
 
function GetLocalComputerName: string;
var
  nSize: DWORD;
begin
  nSize := MAX_COMPUTERNAME_LENGTH + 1;
  SetLength(Result, nSize);
  if not GetComputerName(PChar(Result), nSize) then
    Result := '';
end;
 
function GetComputerSID:string;
var
  Sid: PSID;
  cbSid: DWORD;
  cbReferencedDomainName : DWORD;
  ReferencedDomainName: string;
  peUse: SID_NAME_USE;
  Success: BOOL;
  lpSystemName : string;
  lpAccountName: string;
begin
  Sid:=nil;
  try
    lpSystemName:='';
    lpAccountName:=GetLocalComputerName;
 
    cbSid := 0;
    cbReferencedDomainName := 0;
    // First call to LookupAccountName to get the buffer sizes.
    Success := LookupAccountName(PChar(lpSystemName), PChar(lpAccountName), nil, cbSid, nil, cbReferencedDomainName, peUse);
    if (not Success) and (GetLastError = ERROR_INSUFFICIENT_BUFFER) then
    begin
      SetLength(ReferencedDomainName, cbReferencedDomainName);
      Sid := AllocMem(cbSid);
      // Second call to LookupAccountName to get the SID.
      Success := LookupAccountName(PChar(lpSystemName), PChar(lpAccountName), Sid, cbSid, PChar(ReferencedDomainName), cbReferencedDomainName, peUse);
      if not Success then
      begin
        FreeMem(Sid);
        Sid := nil;
        RaiseLastOSError;
      end
      else
        Result := SIDToString(Sid);
    end
    else
      RaiseLastOSError;
  finally
    if Assigned(Sid) then
     FreeMem(Sid);
  end;
end;
 
 
begin
 try
   Writeln(GetComputerSID);
 except
    on E:Exception do
        Writeln(E.Classname, ':', E.Message);
 end;
 Writeln('Press Enter to exit');
 Readln;
end.

The output of GetComputerSID() is something like this:

S-1-5-21-0123456789-012345678-0123456000

Another example of getting the Machine SID using WMI:

program GetWMI_Info;
 
{$APPTYPE CONSOLE}
 
uses
  SysUtils,
  ActiveX,
  ComObj,
  Variants;
 
function  GetComputerSID:string;
const
  WbemUser            ='';
  WbemPassword        ='';
  WbemComputer        ='localhost';
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer(WbemComputer, 'root\CIMV2', WbemUser, WbemPassword);
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT SID FROM Win32_Account Where SIDType=1','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  if oEnum.Next(1, FWbemObject, iValue) = 0 then
  begin
    Result:=FWbemObject.SID;
    Result:=Copy(Result,1,LastDelimiter('-',Result)-1);
    FWbemObject:=Unassigned;
  end;
end;
 
 
begin
 try
    CoInitialize(nil);
    try
      Writeln(GetComputerSID);
    finally
      CoUninitialize;
    end;
 except
    on E:EOleException do
        Writeln(Format('EOleException %s %x', [E.Message,E.ErrorCode]));
    on E:Exception do
        Writeln(E.Classname, ':', E.Message);
 end;
 Writeln('Press Enter to exit');
 Readln;
end.

Source: delphi – How to extract computer/machine SID? – Stack Overflow

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Mysql_insert_id() returns 0

Admin — Fri, 26 Oct 2012 09:49:16 +0000

Taken from the MySQL manual page:

The ID generated for an AUTO_INCREMENT column by the previous query on success, 0 if the previous query does not generate an AUTO_INCREMENT value, or FALSE if no MySQL connection was established.

A quick solution is to check that your table has an auto_increment field.

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Read First N Lines of a File with HEAD

Admin — Fri, 26 Oct 2012 09:43:54 +0000

Read the first 10 lines of a file with HEAD:

head -10 /path/to/file.log

HEAD supports also huge files, so don’t worry about the file size.

The post Read First N Lines of a File with HEAD appeared first on MINIMALITE.

ERROR 126 (HY000): Incorrect key file for table

Admin — Sun, 21 Oct 2012 23:59:32 +0000

This error is generally generated because there is no more space in the temp directory configured in the my.cnf file. To solve the problem just edit the file /etc/mysql/my.cnf and change the tmpdir value:

tmpdir = /home/tmp

Make sure the new temp directory /home/tmp has the needed space available.

Save the file my.cnf and restart the MySQL service:

/etc/init.d/mysql restart

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