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Tobias_Neumeyer's avatar
Tobias_Neumeyer
Icon for Nimbostratus rankNimbostratus
Jun 29, 2009

iRule / uri parameter manipulation

Hi,

 

 

Sorry, but I need some help from some experts again.

 

 

I'm trying to write an iRule which modifies a post request to the server.

 

This is the example request.

 

 

https://wss01.sharepoint.mydomain.com/Job%20Requisition%20and%20Management/_layouts/searchresults.aspx?k=eula&u=https%3A%2F%2Fwss01%2Esharepoint%2Emydomain%2Ecom%2FJob%20Requisition%20and%20Management

 

 

What I'm trying to do is to modify the parameter "u=https" to "u=http" only if the uri contains "/searchresults.aspx" before it is send to the server. The Hosts can be diffrent as well.

 

 

Thank you very much advance

 

Tobias
application delivery
dev
devops
iRules

5 Replies

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  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Jun 29, 2009
    Hi Tobias,

    Something like this? 

     
 when HTTP_REQUEST { 
  
     Check if path ends with /searchresults.aspx 
    if {[string tolower [HTTP::path]] ends_with "/searchresults.aspx"}{ 
  
        Rewrite URI for u=http:// to u=https:// 
       HTTP::uri [string map -nocase {u=http:// to u=https://} [HTTP::uri] 
  
       log local0. "[IP::client_addr]:[TCP::client_port]: Updated query string to [HTTP::query]" 
    } 
 }

    I'm assuming there won't be any other scenarios where a parameter ends with u and starts with http://. I suppose you could parse the actual value for an actual parameter named "u" using [URI::query [HTTP::uri] u], replace http:// with https:// and then replace the original value with the updated one. But that seems like a log of unnecessary overhead.

    Aaron
  • Tobias_Neumeyer's avatar
    Tobias_Neumeyer
    Icon for Nimbostratus rankNimbostratus
    Jun 29, 2009
    Hi Aaron,

     

     

    I really appreciate your input. Thanks a lot.

     

     

    If I'm using your iRule I get the following error.

     

     

    01070151:3: Rule [wss_search_rewrite] error:

     

    line 7: [string map list should have an even number of elements] [{u=http:// to u=https://}]

     

     

    Could be that the rule tries to compare http with u or something like this?

     

     

    Any idea what could be wrong?

     

     

    Thanks a lot!

     

     

    Tobias

     

  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Jun 29, 2009
    Sorry, bad copying and pasting on my part. I was also missing a closing square brace after HTTP::uri. You can remove the "to" in the middle. And actually, if you're on a version lower than 9.4.7, you should replace the curly braces with double quotes to avoid a bug (SOL7988 - Click here). 

     
  when HTTP_REQUEST {  
  
      Check if path ends with /searchresults.aspx  
     if {[string tolower [HTTP::path]] ends_with "/searchresults.aspx"}{  
  
         Rewrite URI for u=http:// to u=https://  
        HTTP::uri [string map -nocase "u=http:// u=https://" [HTTP::uri]] 
  
        log local0. "[IP::client_addr]:[TCP::client_port]: Updated query string to [HTTP::query]"  
     }  
  }

    Aaron
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Jun 29, 2009
    Is the update actually being made in the request to the server? Maybe it's a problem with caching of the HTTP:: commands. I thought using HTTP::query would have shown the update. Can you try logging in a second HTTP_REQUEST event? 

     
   when HTTP_REQUEST {   
  
       Check if path ends with /searchresults.aspx 
      if {[string tolower [HTTP::path]] ends_with "/searchresults.aspx"}{   
  
          Rewrite URI for u=https:// to u=http:// 
         HTTP::uri [string map -nocase "u=https:// u=http://" [HTTP::uri]]  
  
         log local0. "[IP::client_addr]:[TCP::client_port]: Updated query string to [HTTP::query]" 
      }   
   } 
   when HTTP_REQUEST priority 501 { 
         log local0. "[IP::client_addr]:[TCP::client_port]: 501 Updated query string to [HTTP::query]" 
   }

    Aaron
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Jun 30, 2009
    Is the change actually being made to the requested URI? If you check the server logs or run tcpdump on the server VLAN, do you see the URI being rewritten?

     

     

    Aaron