Add exception to response rewrite

Hi,

 

 

It should be possible to either use a STREAM::expression regex to avoid rewriting the content you don't want to or use the STREAM_MATCHED event to modify what is rewritten.

 

 

Can you clarify what your current STREAM::expression is? The one you have listed doesn't appear in the input parameter you've listed.

 

 

Aaron

The input hidden to avoid is:

 

 

 

 

And the irule code is:

 

 

when HTTP_REQUEST {   
    
       Inicializamos una variable para comprobar si tenemos que reescribir las cabeceras/contenido  
      set check_response 0   
    
       Comprobamos si el path es el que buscamos  
      if {[HTTP::uri] starts_with "/nilo"} {  
             Ponemos la variable a 1 para actuar en las cabeceras/contenido  
           set check_response 1   
          }   
   }  
   when HTTP_RESPONSE {    
    
       Comprobamos que no escribimos una cabecera que no debemos  
      if {$check_response}{   
    
          Comprobamos si la cookie JSESSIONID existe  
         if {[HTTP::cookie exists JSESSIONID]}{    
    
             Establecemos el path de la cookie a /sdr/nilo  
            HTTP::cookie path JSESSIONID "/sdr/nilo"  
         }   
    
          Comprobamos si la peticion es text  
         if {[HTTP::header value Content-Type] contains "text"} {    
    
             Establecemos el texto a reemplazar y activamos el filtro stream  
            STREAM::expression {@/nilo/@/sdr/nilo/@}    
            STREAM::enable  
    
         } else {    
             En las respuestas que no son text, desactivamos el filtro stream  
            STREAM::disable  
         }    
      }    
   }

That might be a bit trickier than I thought originally. Do you want to not rewrite any input parameter in the response content? What is the context for other strings are you trying to rewrite? Can you provide a few examples of strings you do want to rewrite and a few examples of strings you don't want to rewrite?

 

 

Thanks,

 

Aaron

Posted By hoolio on 11/11/2009 11:43 AM

That might be a bit trickier than I thought originally. Do you want to not rewrite any input parameter in the response content? What is the context for other strings are you trying to rewrite? Can you provide a few examples of strings you do want to rewrite and a few examples of strings you don't want to rewrite?

Thanks,

Aaron

Well, as I noticed, we only need to avoid rewriting and input, although if it's easier not to rewrite all the input parameters, its ok.

Rewrite example:

 
  target="_self" name="frm" action="/nilo/SvtMontarPaginaComun?clase=certificaciones.AccModificarCertificacion" method="post">

No rewrite examples (there are more axamples, but all without /nilo, only the urlDestino has the value we replace with the current irule and we dont want to replace).

If you're able to not rewrite any input parameter, it should be a little easier. I haven't this fully, but the regex seems to work in some quick checks. If you see any issues with this, can you reply with the log output from /var/log/ltm?

Thanks,

Aaron

 
 when HTTP_REQUEST { 
  
     Inicializamos una variable para comprobar si tenemos que reescribir las cabeceras/contenido 
    set check_response 0 
  
     Comprobamos si el path es el que buscamos 
    if {[HTTP::uri] starts_with "/nilo"} { 
        Ponemos la variable a 1 para actuar en las cabeceras/contenido 
       set check_response 1 
    } 
 } 
 when HTTP_RESPONSE { 
  
     Comprobamos que no escribimos una cabecera que no debemos 
    if {$check_response}{ 
  
        Comprobamos si la cookie JSESSIONID existe 
       if {[HTTP::cookie exists JSESSIONID]}{ 
  
           Establecemos el path de la cookie a /sdr/nilo 
          HTTP::cookie path JSESSIONID "/sdr/nilo" 
       } 
  
        Comprobamos si la peticion es text 
       if {[HTTP::header value Content-Type] contains "text"} { 
  
           Establecemos el texto a reemplazar y activamos el filtro stream 
          STREAM::expression {@/nilo/@/sdr/nilo/@} 
          STREAM::enable 
  
       } else { 
           En las respuestas que no son text, desactivamos el filtro stream 
          STREAM::disable 
       } 
    } 
 } 
 when STREAM_MATCHED { 
  
    log local0. "[IP::client_addr]:[TCP::local_port]: Matched: [STREAM::match]" 
  
     Only rewrite /nilo/ to /sdr/nilo/ if the matched string is not an input parameter 
     Check if matched string does not start with     if {not ([string tolower [STREAM::match]] starts_with "  
        Replace /nilo/ with /sdr/nilo/ in the matched string and use that for the replacement 
       STREAM::replace "[string map {/nilo/ /sdr/nilo/} [STREAM::match]]" 
  
       log local0. "[IP::client_addr]:[TCP::client_port]: Matched: [STREAM::match], replaced with: [string map {/nilo/ /sdr/nilo/} [STREAM::match]]" 
  
    } else { 
  
        Prevent replacement from being performed by calling STREAM::replace with no value 
       STREAM::replace 
       log local0. "[IP::client_addr]:[TCP::client_port]: Matched: [STREAM::match], but did not perform replacement" 
    } 
 }