Perl:
 * gbgraph.pl
   This is the main program generating the datafiles for the
   PHP grapher.
 * calc.pl
   This is a part being called from gbgraph.pl, calculating the 
   output from MRTGLOG.
 * archiver.pl
   This is the archiver program.

PHP:
 * mrtg.php
   The page for layouting your MRTG, with tabs and the traffic graph.
 * img.php
   A PHP-script generating the tab's.
 * gb.php
   The PHP-script that draws the graph.

PNG:
 * fun.png
   A 'very ugly' example of a possible baseimage, see extra's.

* Unix system (might work on Windoze as well)
* A webserver (Apache) with PHP 4.0.x, compiled with GD
* GD 1.6+
* Perl 5.0 or higher (pref. 5.6.x)
* CRON, or anything that can call programs at a given time
* MRTG 2.x (tested on 2.9.12), Compile MRTGLOG (in MRTG-contrib-dir)

1. Create a directory for the Perl-scripts, not web-accessable.
   Example: /home/httpd/gbgraph

2. Make sure the Perl-location in all scripts is correct
   (#!/full/path/to/perl). You can locate perl: 'whereis perl'.

3. Edit any variabeles in top of the scripts (perl and PHP) to
   match your system. Make sure the perl scripts are executable
   (chmod a+x *.pl).

4. Compile mrtglog (located in your mrtg/contrib directory):
   Example: gcc -o /home/httpd/gbgraph/mrtglog mrtglog.c
   (make sure the binary "mrtglog" will be in 'our' directory)

5. Copy the PHP script to your MRTG-workdir.
   Example: /home/httpd/html/mrtg

6. Edit gbgraph.pl:
   '#$new = "true";' --> '$new = "true";' (uncomment)
   Now we can generate this month until yesterday.

7. Run gbgraph.pl once. It now should generate [target].data files in
   your MRTG-workdir.
   Example: ./gbgraph.pl

8. Check your MRTG-workdir for the .data files; if they look oke, the 
   program is working fine.
   Example line from .data file: 20010429	14643633463.234

9. If everything looks good; edit gbgraph.pl again and comment
   the '$new = "true";' to '#$new = "true";'. Now gbgraph.pl is ready
   for normal operation.

10.Edit your crontab: 'crontab -e' :
   10 0 * * * /home/httpd/gbgraph/gbgraph.pl
   15 0 1 * * /home/httpd/gbgraph/archiver.pl /mrtg.cfg
   Make sure paths are reflecting your situation. For archiver.pl
   you have to add the full path to your mrtg.cfg file.

11.Access your mrtg.php:
   Example: http://noc.trueserver.nl/Summit4/mrtg.php
   
If you see a neat mrtg-page with tab's on top and a MB/GB/TB usage graph,
everything is fine. Else you have to play around ;0) 

Btw, tab's will get active as soon as a archive exists (generated every 
first day of the month.). 

Enjoy!

* BaseImg:
  In (or else were from you call gb.php image) mrtg.php you can modify 
  the look&feel of the graph, by adding a "base image". 
  If you change: <img src=gb.php?host=ETC> to 
  <img src=gb.php?baseimg=fun&host=ETC> you will see a 'very ugly' 
  background (you have to copy the fun.png to your MRTG-workdir!).
  This comes from the 'fun.png' image. If you have the qualities to create
  neat images this can be a very nice option. I'm pleased to receive
  your wonderful creations!

  

* Color:
  On the same way as the above option you can add "blue=xxx","red=xxx" 
  and "green=xxx" options for coloring the graph. 
  Example: <img src=gb.php?red=200&blue=200&green=0&host=ETC> gives a purple
  graph. You can use 1 to 235 as valid values.

   

* Details:
  It is also possible to show separated IN and OUT traffic usage. 
  This extra is created by Roel van der Ouderaa.

  <img src=gb2.php?host=ETC> will show an other graph:

  

* Weekly backup:
  The 'archiver.pl'-script also has a week-backup option. If you call the 
  script every first day of the week (monday) it'll generate a weekly 
  backup (including tar-file), with the name: YYYY-WW;
  Example: for week 23, year 2001: directory 2001-23
           and tarfile: 2001-23.tar.gz

   0.1  - Basic GB/D graph with input from file
        - Dotted blue Average-line
   0.2  - Larger image
        - Total this, Total last month, Average and Peak in text
        - Calculate expected use on basis of average
   0.3  - Variable graph-color
   0.4  - DayInMonth variable; so no static 31 days
        - GB/TB conversion for month-total/expected
   0.9  - total code makeover
        - overall debug mogelijkheid met &debug=1
        - extra filecheck
        - diverse for() lussen toegevoegd om code optimize
        - functies als trim/sprintf gebruikt om strings netter (te formater)
        - auto output format in bytes, k, m, g, t, en peta bytes.
        - totaal berekening met array functie, max berekening omgeschreven,
          avg nu over aantal dagen dat er waardes zijn ipv over aantal dagen maand
        - grijs raster toegevoegd
        - y-waarde met 1 decimaal, rechts uitgelijnt
        - uitlijnen totaal overzicht op rechts incl. afrondenen formateren 0.1f.
   1.0  - using new .data filetype, with date in it.
   1.2  - added archiving function
   1.3  - added tab's
   1.4  - 2 color graph, baseimg option
   1.9  - lot's of debugging and optimizing, perl and php.