Forum Discussion
Yozzer
Nimbostratus
NimbostratusSearch payload and redirect to payload value
Hi
I need some help with the irule below. I want to search for a POST data name 'Relay" and then check its value and then redirect the POST to the Relay value . Relay could have a few different values to redirect to. Any help would be great. Thanks
when RULE_INIT {
Default amount of request payload to collect (in bytes)
set static::collect_length 2048
}
when HTTP_REQUEST {
Only check POST requests
if {([HTTP::method] == "POST") && ([HTTP::uri] == "/test")} {
Check for a non-existent Content-Length header
if {[HTTP::header Content-Length] eq ""}{
Use default collect length of 1k for POSTs without a Content-Length header
set collect_length $static::collect_length
} elseif {[HTTP::header Content-Length] == 0}{
Don't try collect a payload if there isn't one
unset collect_length
} elseif {[HTTP::header Content-Length] > $static::collect_length}{
Use default collect length
set collect_length $static::collect_length
} else {
Collect the actual payload length
set collect_length [HTTP::header Content-Length]
}
If the POST Content-Length isn't 0, collect (a portion of) the payload
if {[info exists collect_length]}{
Trigger collection of the request payload
HTTP::collect $collect_length
}
}
}
when HTTP_REQUEST_DATA {
foreach p [split [HTTP::payload] &] {
set name [URI::decode [getfield $p = 1]]
set value [URI::decode [getfield $p = 2]]
if {[$name = "Relay" and $value contains "/test2/"]} {
HTTP::redirect "https://test.com/test2/login.aspx"
}
}
}
9 Replies
hoolioCirrostratus
Maybe something like this?when RULE_INIT { Default amount of request payload to collect (in bytes) set static::collect_length 2048 } when HTTP_REQUEST { Only check POST requests if {([HTTP::method] eq "POST") && ([HTTP::uri] eq "/test")} { Check for a non-existent Content-Length header if {[HTTP::header Content-Length] eq ""}{ Use default collect length of 1k for POSTs without a Content-Length header set collect_length $static::collect_length } elseif {[HTTP::header Content-Length] == 0}{ Don't try collect a payload if there isn't one unset collect_length } elseif {[HTTP::header Content-Length] > $static::collect_length}{ Use default collect length set collect_length $static::collect_length } else { Collect the actual payload length set collect_length [HTTP::header Content-Length] } If the POST Content-Length isn't 0, collect (a portion of) the payload if {[info exists collect_length]}{ Trigger collection of the request payload HTTP::collect $collect_length } } } when HTTP_REQUEST_DATA { set relay [URI::decode [URI::query "?[HTTP::payload]" Relay]] if {$relay ne ""}{ HTTP::redirect "https://test.com$relay" } }
Aaron
YozzerThanks Aaron,
Relay may already contain https://test.com/test2/login.aspx so i would redirect if it contained a value:
when HTTP_REQUEST_DATA {
set relay [URI::decode [URI::query "?[HTTP::payload]" Relay]]
if {$relay contains "/test2/"}{
HTTP::redirect "https://test.com/test2/login.aspx"
if {$relay contains "/test3/"}{
HTTP::redirect "https://test.com/test3/login.aspx"
}
}
}
Would this work?
Thanks- hoolioThat would probably work, but this is a bit more efficient:
when HTTP_REQUEST_DATA { switch -glob [URI::decode [URI::query "?[HTTP::payload]" Relay]] { "*/test2/*" { HTTP::redirect "https://test.com/test2/login.aspx" } "*/test3/*" { HTTP::redirect "https://test.com/test3/login.aspx" } } }
Aaron - YozzerHi Aaron
I tried both rules and noticed that the redirect performed a GET request but didnt include the POST data. What would i have to add to perform a redirect of all the POST data to the Relay value?
Thanks for your help. - Yozzer
I found this from a previous post and added your recommendations but found it doesnt save the rule on the BIGIP or give me feedback on its syntax. Also when posting the last part renders html which i took from the "Redirect POST data while load balancing GET iRule" http://devcentral-sea.f5.com/Forums/tabid/1082223/asg/50/showtab/groupforums/aff/5/aft/1172096/afv/topic/Default.aspx :
when HTTP_REQUEST {
if {([HTTP::method] eq "POST") && ([HTTP::uri] eq "/test")} {
HTTP::collect [HTTP::header "Content-Length"]
}
}
when HTTP_REQUEST_DATA {
switch -glob [URI::decode [URI::query "?[HTTP::payload]" Relay]] {
"*/test2/*" {
set static::ext_url "https://test.com/test2/login.aspx"
}
"*/test3/*" {
set static::ext_url "https://test.com/test3/login.aspx"
}
set content " \
<form>>> name=f action='$static::ext_url' method=post>"
foreach p [split [HTTP::payload] &] {
set name [getfield $p = 1] set value [decode_uri [getfield $p = 2]]
set content "${content}" }
set content "${content}</form>"
HTTP::respond 200 content $content
} - YozzerHi
I managed to resolve this apart from this line:
set content "'document.forms.submit();'"
I want to add in [0] like this in a string:
set content "'document.forms[0].submit();'"
but its not allowing me.
Any ideas? - hoolioCan you try the format from this Codeshare example?
http://devcentral.f5.com/wiki/default.aspx/iRules/HTTP_POST_redirectNew118.html
If that doesn't work, can you post the iRule in [ code ] [/ code ] blocks without the spaces to preserve the iRule spacing?
Thanks, Aaron - hoolioA simpler option could be to append the payload to the redirect location. This assumes the client sends a URL encoded post data and the application accepts the parameters in the query string. It has the advantage of not looping through the parameters by name and not depending on Javascript.
when HTTP_REQUEST_DATA { switch -glob [URI::decode [URI::query "?[HTTP::payload]" Relay]] { "*/test2/*" { HTTP::redirect "https://test.com/test2/login.aspx?[HTTP::payload]" } "*/test3/*" { HTTP::redirect "https://test.com/test3/login.aspx?[HTTP::payload]" } } }
Aaron - YozzerThanks Aaron
I added in a back slash and it worked.
set content "'document.forms/[0/].submit();'"
Thanks for your help on this.
