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#!/usr/bin/perl
# ------------------------------------------------------------------------------
# File Name: check_pop3.pl
# Author: Richard Mayhew - South Africa
# Date: 2000/01/21
# Version: 1.0
# Description: This script will check to see if an POP3 is running
# and whether authentication can take place.
# Email: netsaint@splash.co.za
# ------------------------------------------------------------------------------
# Copyright 1999 (c) Richard Mayhew
# Credits go to Ethan Galstad for coding Nagios
# If any changes are made to this script, please mail me a copy of the
# changes :)
# License GPL
# ------------------------------------------------------------------------------
# Date Author Reason
# ---- ------ ------
# 1999/09/20 RM Creation
# 1999/09/20 TP Changed script to use strict, more secure by
# specifying $ENV variables. The bind command is
# still insecure through. Did most of my work
# with perl -wT and 'use strict'
# 2000/01/20 RM Corrected POP3 Exit State.
# 2000/01/21 RM Fix Exit Codes Again!!
# 2003/12/30 CZ Proper CRLF in communication w/server
# Fixed infinite loop
# Error checking on welcome banner, USER, PASS commands
# Better error condition handling
# ------------------------------------------------------------------------------
# -----------------------------------------------------------------[ Require ]--
require 5.004;
# --------------------------------------------------------------------[ Uses ]--
use Socket;
use strict;
# --------------------------------------------------------------[ Enviroment ]--
$ENV{PATH} = "/bin";
$ENV{BASH_ENV} = "";
$|=1;
# ------------------------------------------------------------------[ Global ]--
my $TIMEOUT = 60;
# -------------------------------------------------------------------[ usage ]--
sub usage
{
print "Minimum arguments not supplied!\n";
print "\n";
print "Perl Check POP3 plugin for Nagios\n";
print "Copyright (c) 2000 Richard Mayhew\n";
print "\n";
print "Usage: check_pop3.pl <host> <username> <password> [port]\n";
print "\n";
print "<port> = Port that the pop3 daemon is running on <host>. Defaults to 110.\n";
exit -1;
}
# --------------------------------------------------------------[ bindRemote ]--
sub bindRemote
{
my ($in_remotehost, $in_remoteport, $in_hostname) = @_;
my $proto;
my $sockaddr;
my $this;
my $thisaddr;
my $that;
my ($name, $aliases,$type,$len,$thataddr) = gethostbyname($in_remotehost);
if (!socket(ClientSocket,AF_INET, SOCK_STREAM, $proto)) { die $!; }
$sockaddr = 'S n a4 x8';
$this = pack($sockaddr, AF_INET, 0, $thisaddr);
$that = pack($sockaddr, AF_INET, $in_remoteport, $thataddr);
if (!bind(ClientSocket, $this)) { print "Connection Refused\n"; exit 2; }
if (!connect(ClientSocket, $that)) { print "Connection Refused\n"; exit 2; }
select(ClientSocket); $| = 1; select(STDOUT);
return \*ClientSocket;
}
# ====================================================================[ MAIN ]==
MAIN:
{
my $hostname;
my $remotehost = shift || &usage;
my $username = shift || &usage;
my $password = shift || &usage;
my $remoteport = shift || 110;
# Just in case of problems, let's not hang Nagios
$SIG{'ALRM'} = sub {
print "Something is Taking a Long Time, Increase Your TIMEOUT (Currently Set At $TIMEOUT Seconds)\n";
exit -1;
};
alarm($TIMEOUT);
chop($hostname = `hostname`);
my ($name, $alias, $proto) = getprotobyname('tcp');
my $ClientSocket = &bindRemote($remotehost,$remoteport,$hostname);
&err("no welcome banner\n") unless $_ = <ClientSocket>;
&err("bad welcome banner: " . $_) unless $_ =~ /^\+OK/;
print ClientSocket "USER $username\r\n";
&err("no response to USER command\n") unless $_ = <ClientSocket>;
&err("bad response to USER: " . $_) unless $_ =~ /^\+OK/;
print ClientSocket "PASS $password\r\n";
&err("no response to PASS command\n") unless $_ = <ClientSocket>;
&err("bad response to PASS: " . $_) unless $_ =~ /^\+OK/;
print ClientSocket "LIST\r\n";
my $bad = 1;
my $msgs = 0;
while (<ClientSocket>) {
&err(($1||' UNKNOWN')."\n") if (m/\-ERR(.*)/);
$bad = 0 if /^\+OK/;
$msgs = $1 if /^(\d+)\s+/;
last if /^\./;
}
&message("$msgs\n") unless $bad;
&err("missing +OK to LIST command\n");
}
sub message
{
my $msg = shift;
alarm(0);
print ClientSocket "QUIT\r\n";
print "POP3 OK - Total Messages On Server: $msg";
exit 0;
}
sub err
{
my $msg = shift;
alarm(0);
print ClientSocket "QUIT\r\n";
print "POP3 Error: $msg";
exit 2;
}
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