Forum Discussion

Sumanta_88744's avatar
Sumanta_88744
Icon for Cirrus rankCirrus
Jun 11, 2016

Universal Persistence with X-forwarder

Hi Experts   Can I use Universal persistence using x-forwarder with i-rule? I would have each x-forwarded IP stick to the same back-end pool member. Will this work? Can you please share code? Any ...
application delivery
cloud
iRules
LTM
  • Yann_Desmarest_'s avatar
    Yann_Desmarest_
    Jul 20, 2016

    A formatted version of the "Per VS" rate limiting. You can apply the same irule to all standard VS using UIE persistence.

     

    when RULE_INIT {
    set static::maxReqs 3;
    set static::timeout 60;
}

when HTTP_REQUEST {
        set vs [URI::basename [virtual]]
        if { [HTTP::header exists "X-Forwarded-For"] } {
            set client_IP_addr [getfield [lindex  [HTTP::header values "X-Forwarded-For"]  0] "," 1]
        } else {
            set client_IP_addr [IP::client_addr]
        }
        if { ([HTTP::method] eq "GET") and ([class match [string tolower [HTTP::uri]] ends_with $vs_URI_LIST_TO_LIMIT] ) } {

            whitelist
            if { [class match [IP::client_addr] equals $vs_ips_whitelist] }{
               return
            }
            set getcount [table lookup -notouch "$vs_$client_IP_addr:[HTTP::uri]"]
            if { $getcount equals "" } {
                table set "$vs_$client_IP_addr:[HTTP::uri]" "1" $static::timeout $static::timeout
            } else {
                if { $getcount < $static::maxReqs } {
                    table incr -notouch "$vs_$client_IP_addr:[HTTP::uri]"
                } else {
                    reject
                }
            }
        }
        persist uie $clientip 
}

when HTTP_RESPONSE { 
    persist add uie $clientip 
}

     

Sumanta_88744's avatar
Sumanta_88744
Icon for Cirrus rankCirrus

Hi Yann

 

Getting a whole bunch of errors on this. Can you assist please? I can't debug, not from coding background.

 

01070151:3: Rule [/Common/iRule_rate_limit] error: /Common/iRule_rate_limit:8: error: [command is not valid in the current scope][if { ([HTTP::method] eq "GET") and ([class match [string tolower [HTTP::uri]] ends_with URI_LIST_TO_LIMIT] ) } ] /Common/iRule_rate_limit:10: error: [undefined procedure: set getcount [table lookup -notouch "$client_IP_addr:[HTTP::uri]"] if { $getcount equals "" } { table set "$client_IP_addr:[HTTP::uri]" "1" $static::timeout $static::timeout } else { if { $getcount < $static::maxReqs } { table incr -notouch "$client_IP_addr:[HTTP::uri]" } else { reject } } ][{ set getcount [table lookup -notouch "$client_IP_addr:[HTTP::uri]"] if { $getcount equals "" } { table set "$client_IP_addr:[HTTP::uri]" "1" $static::timeout $static::timeout } else { if { $getcount < $stat

 

Regards,

 

Sumanta.

 

Yann_Desmarest's avatar
Yann_Desmarest
Icon for Cirrus rankCirrus
Aug 16, 2016

Hi,

On my side, I just tested the following irule (same as previous but without comments) :

 

when RULE_INIT {
    set static::maxReqs 20000;
    set static::timeout 1800;
}
when HTTP_REQUEST {
        set client_IP_addr [IP::client_addr]
        if { ([HTTP::method] eq "GET") and ([class match [string tolower [HTTP::uri]] ends_with URI_LIST_TO_LIMIT] ) } {
            set getcount [table lookup -notouch "$client_IP_addr:[HTTP::uri]"]
            if { $getcount equals "" } {
                table set "$client_IP_addr:[HTTP::uri]" "1" $static::timeout $static::timeout
            } else {
                if { $getcount < $static::maxReqs } {
                    table incr -notouch "$client_IP_addr:[HTTP::uri]"
                } else {
                    reject
                }
            }
        }
}

 

And it's working. I'm using 12.1.0 but should be fine on older version. Can you repost the irule you try to use ?