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#!/usr/bin/perl -w

# Changes in revision 1.9

# Added an option for --range, which may be "current" for month-to-date or "previous" for last month
# Changed default date range to 00:00:00 on 1st of month to 23:59:59 at end of month
# Changed the default units to MB, more relevant to non-datacentre users :-)
# Added the option for units=GB, to allow for previous behaviour of this script
# Changed default minimum to 0, to report any info that is available by default 
# Updated help section with the above changes, fixed a couple of typos


use strict;
use Getopt::Long;
use Pod::Usage;

BEGIN {
    # Automatic OS detection ... do NOT touch
    if ( $^O =~ /^(?:(ms)?(dos|win(32|nt)?))/i ) {
        $main::OS = 'NT';
        $main::SL = '\\';
        $main::PS = ';';
    } elsif ( $^O =~ /^VMS$/i ) {
        $main::OS = 'VMS';
        $main::SL = '.';
        $main::PS = ':';
    } else {
        $main::OS = 'UNIX';
        $main::SL = '/';
        $main::PS = ':';
    }
}

use FindBin;
use lib "${FindBin::Bin}";
use lib "${FindBin::Bin}${main::SL}..${main::SL}lib64${main::SL}mrtg2";
use MRTG_lib "2.090017";
use POSIX qw(mktime);

'$Revision: 1.9 $ ' =~ /Revision: (\S*)/;
my $Revision = $1;

my $sendmail = "/usr/lib/sendmail";
$sendmail = "/usr/sbin/sendmail" if -x "/usr/sbin/sendmail";

# main loop
my %opt = ( 
    'catch' => '(?:description|port name):</td>\s*<td>\s*([^<\s]+[^<]*?)\s*</td', 
#    'catch' => 'td>\s*([^<\s]+COLO[^<]*?)\s*</td', 
    'min' => 0,
    'range' => "previous",
    'units' => "MB"
 );
sub walklog ($$$$$);
sub sumlog($$$);
sub mailout($$);

sub main()
{
    # parse options
    GetOptions(\%opt, 'min=i','help|h', 'catch=s', 'email=s','version','range=s','units=s') or exit(1);
    if($opt{help})     { pod2usage(1) }
    if($opt{man})      { pod2usage(-exitstatus => 0, -verbose => 2) }
    if($opt{version})  { print "mrtg-traffic-sum $Revision\n"; exit(0) }
    my $cfgfile = shift @ARGV;
    pod2usage(1) unless $cfgfile and -r $cfgfile;
    my %rcfg;
    my %cfg;
    my @routers;
    my @target;
    my $report = "Subject: Traffic total for '$cfgfile' ($Revision) ";
    readcfg($cfgfile,\@routers,\%cfg,\%rcfg);
    cfgcheck(\@routers, \%cfg, \%rcfg, \@target);
    walklog \@routers, \%cfg, \%rcfg,\$report,\%opt;
    if ($opt{email}) {
	mailout \$report,$opt{email};
    } else {
	print $report;
    }
}

main;

sub walklog ($$$$$){
    my $routers = shift;
    my $cfg = shift;
    my $rcfg = shift;
    my $report = shift;
    my $opt = shift;
    my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday) = localtime(time);
      my $start = mktime(0, 0, 0, 1, $mon-1, $year, 0, 0, 0);
      my $end = mktime(0, 0, 0, 1, $mon, $year, 0, 0, 0)-1;
    if ($opt{range} eq "previous") {
      $start = mktime(0, 0, 0, 1, $mon-1, $year, 0, 0, 0);
      $end = mktime(0, 0, 0, 1, $mon, $year, 0, 0, 0)-1;
    }
    if ($opt{range} eq "current") {
      $start = mktime(0, 0, 0, 1, $mon, $year, 0, 0, 0);
      $end = mktime(0, 0, 0, 1, $mon+1, $year, 0, 0, 0)-1;
    } 

    my($m,$y) = (localtime($start))[4,5];
    $y += 1900;
    $m ++;
    $$report .= sprintf "%04d/%02d\n\n", $y,$m;

    $$report .= "Start: ".localtime($start)."\n";
    $$report .= "End:   ".localtime($end)."\n";
if ($opt{'units'} eq "GB") {
    $$report .= sprintf "%-40s  %15s\n","Interface","In+Out in GB";
} else {
    $$report .= sprintf "%-40s  %15s\n","Interface","In+Out in MB";
}
    $$report .= ("-" x 78)."\n";
    foreach my $r (@$routers) {
        my $label;
	if ($rcfg->{pagetop}{$r} =~ /$opt{catch}/i ) {
	    $label = $1;
	    $label .= " $2" if $2;
            my ($in,$out) = sumlog $cfg->{logdir}.$rcfg->{directory}{$r}."$r.log",$start,$end;
            my $sum = ($in+$out)/(10**6);
if ($opt{'units'} eq "GB") {
            $sum = ($in+$out)/(10**9);
} else {
            $sum = ($in+$out)/(10**6);
}
            next if $sum < $opt{'min'};
            $$report .= sprintf "%-40s  %15.0f\n",$label,$sum;
        }
    }
}

sub sumlog ($$$) {
    my $log = shift;
    my $start = shift;
    my $end = shift;
    my $in = 0.0;
    my $out = 0.0;    
    if (open L, "<",$log){
            my @this=($end+1,0,0);
            my @prev;
            while (<L>) {
        	chomp;
        	@prev = @this;
        	@this = (split /\s+/)[0,1,2];

        	if ($prev[0] <= $end) {
        	    my $diff = $prev[0] - $this[0];
        	    $in += $diff * $prev[1];
        	    $out += $diff * $prev[2];
	        }
        	last if $this[0] <= $start;
            }
            close L;
    } else {
        warn "WARN Skipping $log\n";
    }       
    return $in,$out;
}

sub mailout ($$) {
    my $data = shift;
    my $rec = shift;
    open S, "|-" or  exec $sendmail,'-f',$rec,$rec;
    print S <<MESSAGE;
From: $rec
To: $rec
$$data
MESSAGE
    close S;

}
1

__END__

=head1 NAME

mrtg-traffic-sum - Builds monthly traffic summary from mrtg log files

=head1 SYNOPSIS

B<mrtg-traffic-sum> [I<options>...] B<config-file>

     --man           show man-page and exit
 -h, --help          display this help and exit
     --version       output version information and exit
     --catch=regexp  filter out things that match this in PageTop
     --email=address email the result
     --min=gigabytes minimal number of gigabites required for report
     --range=<when>  Specify "current" for month-to-date, "previous" for last complete month	
     --units=[GB|MB] Display results in gigabytes (default is MB)

=head1 DESCRIPTION

The mrtg-traffic-sum goes through the mrtg logs for the targets in the
the config file specified and builds the traffic total for the last
month in Giga Bytes. (Note in communications Giga is 10^9).

The result of this analysis can be sent via email to an address of
your choice using the B<--email> option.

With the B<--catch> option you can specify a regular expression which
will be matched against the contents of the PageTop settings. The
regular expression should return a value into $1 and possibly into
$2. This will then be used as description for the appropriate traffic
sum. By default the catch is set to:

 (?:description|port name):</td>\s*<td>\s*([^< ]*?[^<]*?)\s*</td

By default, all traffic which is over one megabyte gets reported. Use the
B<--min> switch to change this number.

=head1 COPYRIGHT

Copyright (c) 2002 by Tobias Oetiker. All rights reserved.

=head1 LICENSE

This program 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; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

=head1 AUTHOR

Tobias Oetiker E<lt>tobi@oetiker.chE<gt>,
Keith Dunnett E<lt>keith@dunnett.nameE<gt>

=head1 HISTORY

 2002-07-13 to Initial Version
 2009-12-38 kd New features

=cut

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