Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual download pdf (Page 17)

ServerIron ADX OpenScript Guide 7

53-1002445-01

Chapter

OpenScript Fundamentals

Overview

This following sections of this chapter describe the process of creating a simple script using the

Perl-based, OpenScript environment.

Structure of a ServerIron ADX Perl script

The structure of a Perl script written for OpenScript differs slightly from the standard free-flowing

script program usually associated with Perl. In a regular perl script, methods (subs) can be freely

defined and invoked from the main body of the script. To provide for optimal packet processing,

scripts written for the OpenScript environment build their behavior around the scripting engine with

application and protocol event handlers. These handlers are a published list of events that a user

script can catch by enclosing their event handling code in a Perl function or sub named after the

event. Figure 3 provides a list of application and protocol events provided for OpenScript. For a

complete list of events, see the Brocade OpenScript API Reference Guide.

TABLE 3 Application and Protocol Events in ADX scripts

Application/

Protocol

Event Description Attached Script Method Use

HTTP On request header parsing

completion

HTTP_REQUEST Perform request header

inspection and insertion/deletion

Request payload data

available. Called when entire

payload available.

Only triggered by collect() API.

HTTP_REQUEST_DATA Inspect and modify HTTP request

payload data.

On response header parsing

completion

HTTP_RESPONSE Perform response header

inspection and insertion/deletion.

Response payload data

available. Called when entire

response payload is available.

Only triggered by collect() API.

HTTP_RESPONSE_DATA Inspect and modify HTTP response

payload.

TCP On new client SYN request. TCP_CLIENT_SYN Authentication, connection

rate-limiting based on IP.

On successful TCP client

connection establishment.

TCP_CLIENT_ESTABLISHED Pre TCP data transfer processing

context.

On client initiating a TCP

CLOSE.

TCP_CLIENT_CLOSE Update counters/state.

On receiving a TCP client

RESET

TCP_CLIENT_RESET Update counters/state.

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