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ottleydamian's avatar
ottleydamian
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Mar 03, 2019
Solved

TCP iRule to find HTTP headers

I have a situation where I have an iRule that works once the user is using the HTTP protocol. Unfortunately, the same VIP handles a proprietary protocol from Oracle called T3. To use the iRule I need...
application delivery
iRules
LTM
  • Niels_van_Sluis's avatar
    Niels_van_Sluis
    Mar 03, 2019

    I think you could limit the iRule to this:

    when CLIENT_ACCEPTED {
    HTTP::disable
    TCP::collect 4
}

when CLIENT_DATA {
    if { [TCP::payload 4] contains "GET" } {
        HTTP::enable
    }
    TCP::release
}

when HTTP_REQUEST {
    my irule
}

when HTTP_RESPONSE {
    my irule
}

    I'll expect the HTTP_REQUEST and HTTP_RESPONSE events will not be triggered when the HTTP profile is disabled.

ottleydamian's avatar
ottleydamian
Icon for Cirrus rankCirrus
Mar 03, 2019

Another thought I had was disabling and enabling events so I can have 1 iRule: (I haven't tested it in production yet but my preliminary test suggest that it should work)

when CLIENT_ACCEPTED {
  TCP::collect 4
}
when CLIENT_DATA {

log local0. "Before GET"

  if { [TCP::payload 4] contains "GET" } {
     HTTP::enable
     event HTTP_REQUEST enable
     event HTTP_RESPONSE enable
     rule Levi-Test

log local0. "After GET"  
     if { [PROFILE::exists http] == 1 }{
     log local0. "HTTP profile was added"
     }
    } else {
    HTTP::disable
    event HTTP_REQUEST disable
    event HTTP_RESPONSE disable
    rule none
    log local0. "HTTP profile was removed..."
}
 TCP::release
}
when HTTP_REQUEST {
my irule
}
when HTTP_RESPONSE {
my irule
}