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JustCooLpOOLe's avatar
JustCooLpOOLe
Icon for Cirrocumulus rankCirrocumulus
Feb 10, 2023

iRule Shenanigans - My Brain hurts

Hola, We have a virtual server where we host a bunch of iFiles.  We want to create an irule that redirects to a specific path if the user just puts the domain or IP address and nothing else.  That t...
application delivery
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  • Paulius's avatar
    Paulius
    Feb 13, 2023

    JustCooLpOOLe I see the issue with your iRule and it's both in the if statement and switch statement. For the if statement where you look at the HTTP::host you are matching it to "/" which will never match because host names do not have a "/" in them. The issue with the switch statement is that you are not matching against any particular value denoted by "switch {" which isn't matching against anything in particular. Based on the iRule that you have in place it doesn't seem as though you are matching on a host at all and are just concerned with the URI path so the following iRule should work for you. In conjunction with this iRule you should consider configuring a OneConnect profile so that every HTTP request is passed through the iRule rather than just the initial HTTP request when the TCP connection is formed. I would also like to note that the iRule that you provided does not match what you put in your original post so if what I have provided this time doesn't meet your needs could you provide additional information on what you are attempting to achieve?

    when HTTP_REQUEST priority 500 {

    set HOST [HTTP::host]
    set URI [string tolower [HTTP::uri]]

    switch -glob -- ${URI} {
        "/" {
            HTTP::redirect 301 Location "https://${HOST}/mainpage.html"
        }
        "/mainpage.html" {
            HTTP::respond 200 content [ifile get "mainpage.html"]
        }
        "/mylogo.jpg" {
            HTTP::respond 200 content [ifile get "mylogo.html"]
        }
        default {
            drop
        }
    }

}

     

JustCooLpOOLe's avatar
JustCooLpOOLe
Icon for Cirrocumulus rankCirrocumulus

Thanks!  So there are no default pools because everything is provided by an iFile.  It's really one main page (iFile) that calls multiple other iFiles for like logos and links to other pages.  So the the problem is that we tried to do put the if statement before the switch but since it's on the same virtual server, it doesn't appear to redirect.  Like so:  

 

when HTTP_REQUEST {

     if { HTTP::host eq "/" } { HTTP::redirect https://[HTTP::host]/mainpage.html }

     switch {

          "/mainpage.html" { HTTP::respond 200 content [ifile get mainpage.html] }
          "/mylogo.jpg" { HTTP::respond 200 content [ifile get mylogo.html] }
          ...

     }


}

 

Not sure if that makes sense.

Paulius's avatar
Paulius
Icon for MVP rankMVP
Feb 13, 2023

JustCooLpOOLe I see the issue with your iRule and it's both in the if statement and switch statement. For the if statement where you look at the HTTP::host you are matching it to "/" which will never match because host names do not have a "/" in them. The issue with the switch statement is that you are not matching against any particular value denoted by "switch {" which isn't matching against anything in particular. Based on the iRule that you have in place it doesn't seem as though you are matching on a host at all and are just concerned with the URI path so the following iRule should work for you. In conjunction with this iRule you should consider configuring a OneConnect profile so that every HTTP request is passed through the iRule rather than just the initial HTTP request when the TCP connection is formed. I would also like to note that the iRule that you provided does not match what you put in your original post so if what I have provided this time doesn't meet your needs could you provide additional information on what you are attempting to achieve?

when HTTP_REQUEST priority 500 {

    set HOST [HTTP::host]
    set URI [string tolower [HTTP::uri]]

    switch -glob -- ${URI} {
        "/" {
            HTTP::redirect 301 Location "https://${HOST}/mainpage.html"
        }
        "/mainpage.html" {
            HTTP::respond 200 content [ifile get "mainpage.html"]
        }
        "/mylogo.jpg" {
            HTTP::respond 200 content [ifile get "mylogo.html"]
        }
        default {
            drop
        }
    }

}

 

  • JustCooLpOOLe's avatar
    JustCooLpOOLe
    Icon for Cirrocumulus rankCirrocumulus
    Feb 13, 2023

    Thanks!  I'll take a look and revisit.

    Just to note that the original statement was that I split the "if" statement into one iRule and the "switch" into another iRule so I just added verbiage for the redirect and then wanted to make clear what I was doing with the switch statement so I added code.  Sorry for the confusion.

  • JustCooLpOOLe's avatar
    JustCooLpOOLe
    Icon for Cirrocumulus rankCirrocumulus
    Feb 13, 2023

    Paulius I tested this out in my lab and it worked as expected.  I did have to remove "301 Location" as it gave me errors when trying to add the irule.  I'm on version 16.1.3.2 if it makes any difference.

    • Paulius's avatar
      Paulius
      Icon for MVP rankMVP
      Feb 13, 2023

      JustCooLpOOLe I'm glad it worked and excuse my error for the "HTTP::redirect", I had it stuck in my head that it said "HTTP::respond" which you should include the redirect type and location where "HTTP::redirect" automatically responds with a 302.