Forum Discussion

Altostratus

Oct 08, 2020

Solved

iRule HSL logging question with user specified text

I wish to log via HSL a mesage that contains some repeatable text as well as some user generated text. so one of two ways to get text generated I can see. But I some issues with each method. #1: Use ...

Oct 20, 2020

Hello Martin.

With a request-logging profile you can set any kind of format in the template field.

An example of CEF format:

CEF:0|F5|MyEnv|1|sip=$CLIENT_IP sprt=$CLIENT_PORT snatip=$SNAT_IP snatprt=$SNAT_PORT dstip=$SERVER_IP dstprt=$SERVER_PORT dhost=$BIGIP_HOSTNAME apm=$X_APM

Where 'X_APM can be configured injecting an HTTP header:

when HTTP_REQUEST {
	HTTP::header replace X_APM [ACCESS::session data get session.custom.name]
}
when HTTP_REQUEST_RELEASE {
	HTTP::header remove X_APM
}

---

In case you still want to use an iRule, you can get those parameters with:

1) Hostname

$static::tcl_platform(machine)

2) Time

set curtime [clock seconds]
set formattedtime [clock format $curtime]
log "$curtime seconds since epoch, $formattedtime"

Output: 1129552706 seconds since epoch, Mon Oct 17 07:38:26 CDT 2005

Regards,

Dario.

martyn

Altostratus

Oct 19, 2020

Thanks, Not sure that would work in this case. What I need to simulate is the CEF logging format and that is not available from a native profile format choice, plus the data I need to pass in (some arbitrary data). If in effect I am manually writing the CEF formatted message out by a number of profile objects/variables and as well a HTTP header variable(s) or two as data place holders I pretty much may as well just manually create the whole thing via HSL as I am currently. However some (most) of the data that I want is matched from data available in a logging profile, This I am currently getting it from TCL calls, Should they have too great a performance hit I may well see if your proposal would alleviate that. I also didn't know of (think of) using HTTP_REQUEST like that. Interesting and devious I will file that one away, thank you. Martyn Roberts Vodafone/IBM Venture Swindon ISC 07881846887

Dario_Garrido