Forum Discussion

Kalido's avatar
Kalido
Jan 20, 2020

Collect and pass on variables from client device

Hi,

 

I have a VIP with a redirect which is pointing to a captive portal, that works fine.

 

The issue I am having is I need the traffic to collect variables such source Mac address, originating IP added onto a link for example:

 

portal/step1.html?MACAddr=XX%XXX%XXX%XXXX%XXX%XXXX&IPAddr=123.123.123.123&OrigURL=http%3A%2F%2Fwww.msftconnecttest.com%2Fredirect

 

Is this possible from the F5?

 

We would need the client device to point to the VIP then hit the redirect with the variables attached?

 

If I add the url like this:

www.example.com/portal/step1.html?MACAddr=$SUB&IPAddr=$IP&OrigURL=$URL it wont work.

application delivery
BIG-IP
LTM
  • Leonardo_Souza's avatar
    Leonardo_Souza
    Jan 24, 2020

    No, I meant to redirect with the information at the end.

    Try this:

    when HTTP_REQUEST priority 400 {
	set mac [LINK::lasthop]
	set ip [IP::client_addr]
	set url [HTTP::uri]
	switch -glob -- [string tolower [HTTP::host]] {
        	"123.45.67.890"     { HTTP::redirect "https://example.com/portal/step1.html?MACAddr=$mac&IPAddr=$ip&OrigURL=$url" }
	}
}

    Forgot to say...

    Don't forget the mac address you will get is the last device mac address.

    If the client is not in the same network as the F5, it is not going to be the client mac address.

  • Leonardo_Souza's avatar
    Leonardo_Souza
    Icon for Cirrocumulus rankCirrocumulus
    Jan 24, 2020

    No, I meant to redirect with the information at the end.

    Try this:

    when HTTP_REQUEST priority 400 {
	set mac [LINK::lasthop]
	set ip [IP::client_addr]
	set url [HTTP::uri]
	switch -glob -- [string tolower [HTTP::host]] {
        	"123.45.67.890"     { HTTP::redirect "https://example.com/portal/step1.html?MACAddr=$mac&IPAddr=$ip&OrigURL=$url" }
	}
}

    Forgot to say...

    Don't forget the mac address you will get is the last device mac address.

    If the client is not in the same network as the F5, it is not going to be the client mac address.

    • Kalido's avatar
      Kalido
      Jan 27, 2020

      Hi Leonardo,

       

      Thank you so much for getting back to me, this has resolved the issue!

       

      I couldn't see it before but thanks to you these Irules are starting to make more sense.

       

      No all heroes wear capes!

       

      Thank you again!

    • Kalido's avatar
      Kalido
      Jan 21, 2020

      Hi Leonardo,

       

      Thank you very much for your reply.

       

      So I have a rule configured already with the following example:

       

      when HTTP_REQUEST priority 400 {

          switch -glob -- [string tolower [HTTP::host]] {

              "123.45.67.890"     { HTTP::redirect "https://example.com/portal/step1.html?[HTTP::uri]" }

        }

      }

       

      The thing is I need it to go to the following URI https://example.com/portal/step1.html? the redirect above is currently working.

       

      Are you saying that I can create an Irule which will do the redirect first, then it will add the following onto the end of the uri?

       

      so in the end the final uri will look like this:

       

      https://example.com/portal/step1.html?portal/step1.html?MACAddr=XX%XXX%XXX%XXXX%XXX%XXXX&IPAddr=123.123.123.123&OrigURL=http%3A%2F%2Fwww.msftconnecttest.com%2Fredirect

       

      With the Macaddress and the originating IP being the client device which connected to the F5.

       

      This information is basically redirecting to a portal.

       

      I looked at the link you provided and I couldn't see the following, which Irule would modify the URI with the mac address as well as the originating IP and would the F5 be able to process both Irules?