#!/usr/bin/perl -w

# Copyright Bjorn Ruberg <bjorn@ruberg.no>
# Licenced under GPL v2
#
# TODO:
# - Check for OpenLDAP version

# We use one script for all monitoring.
# This script may be symlinked with several names, all
# performing different functions:
# slapd_statistics_bytes
# slapd_statistics_pdu
# slapd_statistics_other
# slapd_connections
# slapd_waiters
# slapd_operations
# slapd_operations_diff

# Magic markers
#%# family=auto
#%# capabilities=autoconf suggest

# use strict;
use Net::LDAP;
use Data::Dumper;

use vars qw ( $config $param $act $scope $descr $cn $vlabel
	      $info $title );

# Change these to reflect your LDAP ACL. The given DN must have
# read access to the Monitor branch.
my $basedn = "cn=Monitor";
my $server = "localhost";
my $userdn = ($ENV{'binddn'} || '');
my $userpw = ($ENV{'bindpw'} || '');

# Remember: bytes, pdu needs scope=base

# The possible measurements
my %ops =
    ('statistics_bytes'
     => {
         'search' => "cn=Bytes,cn=Statistics",
         'desc'   => "The number of bytes sent by the LDAP server.",
         'vlabel' => "Bytes",
         'title'  => "Number of bytes sent",
         'info'   => "The graph shows the number of bytes sent",
	 'scope'  => "base"
         },
     'statistics_pdu'
     => {
         'search' => "cn=PDU,cn=Statistics",
         'desc'   => "The number of PDUs sent by the LDAP server.",
         'vlabel' => "PDUs",
         'title'  => "Number of PDUs sent",
         'info'   => "The graph shows the number of PDUs sent",
	 'scope'  => "base"
         },
     # Referrals
     'statistics_referrals' 
     => {
         'search' => "cn=Referrals,cn=Statistics",
         'attrs'  => "Referrals",
         'desc'   => "The number of Referrals sent by the LDAP server.",
         'vlabel' => "Referrals",
         'title'  => "Number of LDAP Referrals",
         'info'   => "The graph shows the number of referrals sent",
	 'scope'  => "base"
         },
     # Entries
     'statistics_entries'
     => {
         'search' => "cn=Entries,cn=Statistics",
         'attrs'  => "Entries",
         'desc'   => "The number of Entries sent by the LDAP server.",
         'vlabel' => "Entries",
         'title'  => "Number of LDAP Entries",
         'info'   => "The graph shows the number of entries sent",
	 'scope'  => "base"
         },
     # Only read Current and Total
     'connections' 
     => {
         'search' => 'cn=Connections',
         'filter' => '(|(cn=Current)(cn=Total))',
         'desc'   => 'The number of Connections',
         'label'  => {'current' => 'Current',
                      'total'   => 'Total'},
         'vlabel' => 'Connections',
         'title'  => 'Number of Connections',
         'info'   => 'Number of connections to the LDAP server'
           },
     # dn: cn=Write,cn=Waiters,cn=Monitor
     # dn: cn=Read,cn=Waiters,cn=Monitor
     'waiters' 
     => {
         'search' => 'cn=Waiters',
         'filter' => '(|(cn=Write)(cn=Read))',
         'desc'   => "The number of Waiters|",
         'label'  => {'write' => 'Write',
                      'read'  => 'Read'},
         'vlabel' => "Waiters",
         'title'  => "Number of Waiters",
         'info'   => "The graph shows the number of Waiters"
         },
     'operations'
     => {
         'search' => "cn=Operations",
         'desc'   => "Operations",
         'vlabel' => "Operations",
         'title'  => "Operations",
         'info'   => "Number of completed LDAP operations"
         },
     'operations_diff'
     => {
         'search' => "cn=Operations",
         'desc'   => "Operations deviance",
         'vlabel' => "Deviance",
         'title'  => "Operations deviance",
         'info'   => "Deviance between Initiated and Completed ops"
       }
     );

# Config subroutine
sub config {
    my $action = shift;
    print <<EOF;
graph_args --base 1000 -l 0 --vertical-label $ops{$action}->{'vlabel'}
graph_title $ops{$action}->{'title'}
graph_category OpenLDAP
graph_info $ops{$action}->{'info'}
EOF
    
    if ($ops{$action}->{'label'}) {
        while (my ($key, $val) = each (%{$ops{$action}->{'label'}})) {
            my $name = $action . "_" . $key;
            print "$name.label $val\n";
            print "$name.type DERIVE\n";
            print "$name.min 0\n";
        }
    } elsif ($action =~ /^operations(?:_diff)?$/) {
        my $ldap = Net::LDAP->new ($server) or die "$@";
        $ldap->bind ($userdn, password => $userpw) or die "$@";
        my $searchdn = $ops{$action}->{'search'} . "," . $basedn;
        my $mesg =
            $ldap->search (
                           base   => $searchdn,
                           scope  => 'one',
                           filter => '(objectclass=*)',
                           attrs  => ['monitorOpInitiated',
                                      'monitorOpCompleted',
                                      'cn'],
                           );
        $mesg->code && die $mesg->error;
        
        my $max = $mesg->count;
        for (my $i = 0 ; $i < $max ; $i++) {
            my $entry = $mesg->entry ($i);
            my $cn = $entry->get_value ('cn');
            $name = $action . "_" . lc ($cn);
            print "$name.label $cn\n";
            print "$name.type DERIVE\n";
            print "$name.min 0\n";
            if ($action eq "operations") {
                print "$name.info The number of $cn operations\n";
            } else {
                print "$name.info The difference between Initiated ";
                print "and Completed operations (should be 0)\n";
                print "$name.warning 1\n";
            }            
        }
    } else {
        print "$action.label $ops{$action}->{'vlabel'}\n";
        print "$action.type DERIVE\n";
        print "$action.min 0\n";
    }
}

if ($ARGV[0]) {
    if ($ARGV[0] eq 'autoconf') {
        # Check for Net::LDAP
        if (! eval "require Net::LDAP;") {
            print "no (Net::LDAP not found)";
            exit 1;
        }
        # Check for LDAP version 3
        my $ldap = Net::LDAP->new ($server, version => 3)
            or die "no (Needs LDAPv3)";
        $ldap->bind ($userdn, password => $userpw)
            or die ("no (Can't log in, check env file)");
    } elsif ($ARGV[0] eq "config") {
        if ($0 =~ /slapd_([\w\d_]+)$/) {
            my $action = $1;
            &config ($1);
        } else {
            die ("Can't run config without a symlinked name\n");
        }
    } elsif ($ARGV[0] eq "suggest") {
        print join ("\n", keys (%ops)), "\n";
    }
    exit 0;
}

# We won't run this without parameters.
die ("Can't run without a symlinked name\n") if $0 =~ /slapd_$/;

# Default scope for LDAP searches. We'll change to other scopes if
# necessary.
$scope = "one";

# The filename is teh key
(my $action = $0) =~ s/^.*slapd_([\w\d_]+)$/$1/;

# Net::LDAP variant
my $ldap = Net::LDAP->new ($server, version => 3)
    or die "$@";
$ldap->bind ($userdn,password => $userpw)
    or die "$@";

my $searchdn = $ops{$action}->{'search'} . "," . $basedn;
my $searchattrs;

if ($action =~ /^operations(_diff)?$/) {
    # We look for different parameters in Operations branch
    $searchattrs = ['monitorOpInitiated', 'monitorOpCompleted', 'cn'];
} else {
    $searchattrs = ['monitorCounter', 'cn'];
}

my $filter;
if ($ops{$action}->{'filter'}) {
  $filter = "(&(objectclass=*)" . $ops{$action}->{'filter'} . ")";
} else {
  $filter = "(objectClass=*)";
}

if ($ops{$action}->{'scope'}) {
    $scope = $ops{$action}->{'scope'};
}

my $mesg =
    $ldap->search (
                   base   => $searchdn,
                   scope  => $scope,
                   filter => $filter,
                   attrs  => $searchattrs,
                   );

$mesg->code && die $mesg->error;

my $max = $mesg->count;

for (my $i = 0 ; $i < $max ; $i++) {
    my $entry = $mesg->entry ($i);
    my $cn = $entry->get_value('cn');
    if ($action =~ /operations(_diff)?$/) {
	if ($1) {
	    my $opsInit =
		$entry->get_value('monitorOpInitiated'); 
	    my $opsComp =
		$entry->get_value('monitorOpCompleted');
	    print lc ("operations_diff_${cn}.value ");
	    print ($opsInit - $opsComp);
	    print "\n";
	} else {
	    print lc ("operations_${cn}.value ");
	    print $entry->get_value('monitorOpCompleted'),
	    "\n";
	}
    } else {
	# Hotfix, must do for now
	if ($action =~ /_/) {
	    print lc ("${action}.value ");
	} else {
	    print lc ("${action}_${cn}.value ");
	}
	print $entry->get_value('monitorCounter'), "\n";
    }
}
$ldap->unbind;