WELF(3)

NAME
Lire::WELF - Base implementation of a WebTrends(tm) Enhanced Log Format parser

SYNOPSIS
use Lire::WELF;

my $parser = new Lire::WELF;

my $welf_rec = $parser->parse( $line );

DESCRIPTION
This module defines an object able to parse WebTrends(tm) Enhanced Log Format. That log format was defined by WebTrends(tm) for its Firewall Suite. It defines an extensible format that is now used by several packet filter and/or proxy firewall.

The document describing that format is available from http://www.webtrends.com/partners/welfOverview.htm

A list of products/vendor that supports this format can be found at http://www.webtrends.com/partners/firewall.htm

You create a WELF parser object using the new() method:

    my $parser = new Lire::WELF();
To parse a WELF record you invoke the parser() method with the line containing the record as parameter:

    my $rec    = $parser->parse( $line );
The $rec is an hash reference with the WELF field name used as keys and the value of the records as values.

No value are interpreted or checked in any except for the following:

time
    The time field will be converted to epoch time

quotation
    The quotation marks used when the value contains spaces are removed.

  WELF EXTENSIONS
The parser also supports "extensions" to the format found in the field.

port
    We will interpret correctly src and dst fields that have the port embededded in them:

        src=192.168.1.1:1037

interface
    A possible :IFNAME will also be interpreted as the interface name:

        dst=192.168.100.10:23:WAN

timezone
    The time field may contains a time zone identifier:

        time="2001-12-02 12:34:12 UTC"

  Derived Fields
The parser will generate a few 'derived' to complete the format.

src_port
    Will contain the src port portion of the dst field when SonicWall extensions are used.

dst_port
    Will contain the interface portion of the dst field when SonicWall extensions are used.

src_if
    Will contain the interface portion of the src field when SonicWall extensions are used.

dst_if
    Will contain the interface portion of the dst field when SonicWall extensions are used.

VERSION
$Id: WELF.pm,v 1.4 2002/02/05 21:56:24 flacoste Exp $

COPYRIGHT
Copyright (C) 2001 Stichting LogReport Foundation LogReport@LogReport.org

This file is part of Lire.

Lire is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program (see COPYING); if not, check with http://www.gnu.org/copyleft/gpl.html or write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.

AUTHOR
Francis J. Lacoste <flacoste@logreport.org>