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|
#!@@PERL@@ -w
#
# Plugin to monitor dhcp3 leases
#
# Usage: copy or link into /etc/munin/plugins
#
# Parameters:
#
# config (required)
# autoconf (optional - used by munin-config)
#
# Config variables:
#
# user - run by user that can read lease files [root]
# leasefile - What file to read leases from
# configfile - What file to read configuration from
#
# Requires:
# Net::Netmask
# HTTP::Date
#
# $Log$
# Revision 1.1 2004/12/10 13:16:19 jimmyo
# Added plugin generic/dhcpd3, created by Rune N. Skillingstad.
#
#
#
# Magic markers (optinal - used by munin-config and some installation
# scripts):
#
#%# family=contrib
#%# capabilities=autoconf
my $ret = undef;
if(! eval "require Net::Netmask") {
$ret = "Net::Netmask not found";
}
if(! eval "require HTTP::Date") {
$ret = "HTTP::Date not found";
}
use strict;
my %leases = ();
my %networks = ();
my %ips = ();
my $DEBUG = 0;
my $LEASEFILE = $ENV{leasefile} || "/var/lib/dhcp/dhcpd.leases";
my $CONFIGFILE = $ENV{configfile} || "/etc/dhcpd.conf";
if($ARGV[0] and $ARGV[0] eq "autoconf" ) {
if($ret) {
print "no ($ret)\n";
exit 1;
}
if(-f $LEASEFILE) {
if(-r $LEASEFILE) {
if(-f $CONFIGFILE) {
if(-r $CONFIGFILE) {
print "yes\n";
exit 0;
} else {
print "no (config file not readable)\n";
}
} else {
print "no (config gile not found)\n";
}
} else {
print "no (leasefile not readable)\n";
}
} else {
print "no (leasefile not found)\n";
}
exit 1;
}
if (! -f $LEASEFILE and ! -f $CONFIGFILE) {
print "net.value U\n";
exit 0;
}
if($DEBUG) {
print "CONFIGFILE == $CONFIGFILE\nLEASEFILE == $LEASEFILE\n";
}
Net::Netmask->import();
HTTP::Date->import();
parseconfig();
if($ARGV[0] and $ARGV[0] eq "config") {
print "graph_title dhcp leases\n";
print "graph_args --base 1000 -v leases -l 0\n";
print "graph_order ".join(" ",sort(keys(%leases)))."\n";
foreach my $network (sort(keys %leases)) {
my $name = $network;
$name =~ s/_/\./g;
$name =~ s/\.\./\//g;
print "$network.label $name\n";
}
exit 0;
}
parseleases();
foreach my $network (sort(keys %leases)) {
print "$network.value ".$leases{$network}."\n";
}
sub parseconfig {
open(IN, "<$CONFIGFILE") or exit 4;
while(<IN>) {
if(/subnet\s+(\d+\.\d+\.\d+\.\d+)\s+netmask\s+(\d+\.\d+\.\d+\.\d+)/ && ! /^\s*#/) {
initnet($1,$2);
}
}
close(IN);
}
sub parseleases {
my $ip = 0;
my $abandon = 0;
my $time = time();
open(IN, "<$LEASEFILE") or exit 4;
while(<IN>) {
if(/lease\s+(\d+\.\d+\.\d+\.\d+)\s+\{/) {
print "in $1\n" if $DEBUG;
$ip = $1;
}
if($ip && /ends\s+\d+\s+([^;]+);/) {
# 2037/12/31 23:59:59 is max date on perl <= 5.6
print "end $1\n" if $DEBUG;
my $end = HTTP::Date::str2time($1, "GMT");
# we asume that missing $end is valid due to
# restrictions in Time::Local on perl <= 5.6
if($end && $end < $time) {
print "old $end $time:(\n" if $DEBUG;
$abandon = 1;
}
}
if($ip && /^\s*abandoned;$/) {
print "abandoned\n" if $DEBUG;
$abandon = 1;
}
if($ip && /^\s*\}\s*$/) {
my $net = checkip($ip);
if($net && !$abandon) {
if(!counted($ip)) {
$leases{$net}++;
}
}
$abandon = 0;
$ip = 0;
print "out\n\n" if $DEBUG;
}
}
close(IN);
}
sub initnet {
my ($net, $mask) = @_;
my $block = new Net::Netmask($net, $mask);
$networks{$block->desc()} = $block;
my $name = $block->desc();
$name =~ s/\//__/g;
$name =~ s/\./_/g;
$leases{$name} = 0;
}
sub checkip {
my ($ip) = @_;
foreach my $block (keys %networks) {
if($networks{$block}->match($ip)) {
my $name = $block;
$name =~ s/\//__/g;
$name =~ s/\./_/g;
return $name;
}
}
return 0;
}
sub counted {
my ($ip) = @_;
if($ips{$ip}) {
print "$ip already counted\n" if $DEBUG;
return 1;
}
$ips{$ip} = $ip;
print "Counted $ip once!\n" if $DEBUG;
return 0;
}
exit();
|
