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.

AUTHOR

         Francis J. Lacoste <flacoste@logreport.org>

VERSION

       $Id: WELF.pm,v 1.11 2006/07/23 13:16:30 vanbaal 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.