#! /usr/bin/perl
###################################################################
# Munins Plugin to monitor actions of postgrey greylisting daemon #
# Version 0.1                                                     #
###################################################################

######################### Configuration ###########################
# Usually this plugin will look in /var/log/mail.log for the      #
# output of postgrey. You can change that by setting  env.logfile #
# The state file is /var/lib/munin/plugin-state/postgrey-new.state#
# This can be changed by setting env.statefile                    #
# Keep in mind to grant enough rights in order to open the        #
# logfiles etc.                                                   #
# Parameters understood by this plugin                            #
#                                                                 #
#   config   (required)                                           #
#   autoconf (optional)                                           #
#                                                                 #
###################################################################
# This plgin works with postgrey 1.31 but should also do with 1.32#
# Tested under Debian lenny                                       #
###################################################################


### Author Rico Sagner hellriegel@sund-xplosion.de
### Please send bug reports  to this address

use strict;
use warnings;

my $maillog= $ENV{'logfile'} || "/var/log/mail.log";
my $statefile= $ENV{'statefile'} || "$ENV{MUNIN_PLUGSTATE}/postgrey-new.state";

my $greylisted=0;
my $greylisted_old=0;
my $passes=0;
my $passes_old=0;
my $passes_white=0;
my $passes_white_old=0;
my $retry=0;
my $retry_old=0;
my $grey_new=0;
my $pass_new=0;
my $retry_new=0;
my $passes_white_new=0;

if(defined $ARGV[0] and $ARGV[0] eq "autoconf") {
 if ( -f $maillog) {
	print "yes\n";
	}
 else {
	print "no\n";
 }
 exit 0;
}


if(defined $ARGV[0] and $ARGV[0] eq "config") {
	print "graph_title Postgrey Actions\n";
	print "graph_order greylisted retry_early passed passed_w\n";
	print "graph_category mail\n";
	print "graph_vlabel Count\n";
	print "graph_scale no\n";

	print "greylisted.label greylisted_reason_new\n";
	print "greylisted.type GAUGE\n";
	print "greylisted.draw AREA\n";
	print "greylisted.min 0\n";
	print "retry_early.label greylisted_retry_early\n";
	print "retry_early.type GAUGE\n";
	print "retry_early.draw AREA\n";
	print "retry_early.min 0\n";
	print "passed.label passed_found\n";
	print "passed.type GAUGE\n";
	print "passed.draw AREA\n";
	print "passed.min 0\n";
	print "passed_w.label passed_whitelisted\n";
	print "passed_w.type GAUGE\n";
	print "passed_w.draw AREA\n";
	print "passed_w.min 0\n";
	exit 0;
}

if( -f $statefile) {
 open ( STATE ,"<$statefile");
 defined($greylisted_old=<STATE>) or $greylisted_old=0;
 defined($passes_old=<STATE>) or $passes_old=0;
 defined($retry_old=<STATE>) or $retry_old=0;
 defined($passes_white_old=<STATE>) or $passes_white_old=0;
 chomp($greylisted_old);
 chomp($passes_old);
 chomp($retry_old);
 chomp($passes_white_old);
 close STATE;
}



open (LOG ,"<$maillog") or die "Cannot open Maillog";
while(my $line = <LOG>)
{
	if($line=~m/postgrey\[/)
	{
		if($line=~m/action=greylist/) {
			if($line=~m/reason=new/)
			{
				$greylisted++;
			}
			elsif($line=~m/reason=early-retry/)
			{
				$retry++;
			}
		}
		elsif($line=~m/action=pass/)  {
			if($line=~m/reason=triplet/)
			{
				$passes++;
			}
			elsif($line=~m/reason=client/)
			{
				$passes_white++;
			}
		}


	}
}
close(LOG);


open (STATE2,">$statefile");
print STATE2 "$greylisted\n";
print STATE2 "$passes\n";
print STATE2 "$retry\n";
print STATE2 "$passes_white\n";
close STATE2;

if($greylisted_old>$greylisted) { $grey_new=$greylisted; }
elsif($greylisted_old eq $greylisted) { $grey_new=0;}
else { $grey_new=$greylisted-$greylisted_old; }

if($passes_old>$passes) { $pass_new=$passes;}
elsif( $passes_old eq $passes) { $pass_new=0; }
else { $pass_new=$passes-$passes_old; }

if($retry_old>$retry) { $retry_new=$retry;}
elsif($retry_old eq $retry) { $retry_new=0;}
else { $retry_new=$retry-$retry_old; }

if($passes_white_old>$passes_white) { $passes_white_new=$passes_white;}
elsif($passes_white_old eq $passes_white) { $passes_white_new=0;}
else { $passes_white_new=$passes_white-$passes_white_old; }

print "greylisted.value $grey_new\n";
print "retry_early.value $retry_new\n";
print "passed.value $pass_new\n";
print "passed_w.value $passes_white_new\n";

exit 0;