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#!/usr/bin/perl -T -w

########################################################################
#
# <@LICENSE>
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to you under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# </@LICENSE>
#
########################################################################

# Written by Daryl C. W. O'Shea, DOS Technologies <spamassassin@dostech.ca>
# See  perldoc sa-check_spamd  for program info.

use strict;
use warnings;
use re 'taint';

my $PREFIX          = '/usr';             # substituted at 'make' time
my $DEF_RULES_DIR   = '/usr/share/spamassassin';      # substituted at 'make' time
my $LOCAL_RULES_DIR = '/etc/mail/spamassassin';    # substituted at 'make' time
my $LOCAL_STATE_DIR = '/var/lib/spamassassin';    # substituted at 'make' time
use lib '/usr/share/perl5';                   # substituted at 'make' time

use Errno qw(EBADF);
use File::Spec;
use Config;
use POSIX qw(locale_h setsid sigprocmask _exit);

POSIX::setlocale(LC_TIME,'C');

BEGIN {                          # see comments in "spamassassin.raw" for doco
  my @bin = File::Spec->splitpath($0);
  my $bin = ($bin[0] ? File::Spec->catpath(@bin[0..1], '') : $bin[1])
            || File::Spec->curdir;

  if (-e $bin.'/lib/Mail/SpamAssassin.pm'
        || !-e '/usr/share/perl5/Mail/SpamAssassin.pm' )
  {
    my $searchrelative;
    if ($searchrelative && $bin eq '../' && -e '../blib/lib/Mail/SpamAssassin.pm')
    {
      unshift ( @INC, '../blib/lib' );
    } else {
      foreach ( qw(lib ../lib/site_perl
                ../lib/spamassassin ../share/spamassassin/lib))
      {
        my $dir = File::Spec->catdir( $bin, split ( '/', $_ ) );
        if ( -f File::Spec->catfile( $dir, "Mail", "SpamAssassin.pm" ) )
        { unshift ( @INC, $dir ); last; }
      }
    }
  }
}

use Getopt::Long;

use constant HAS_TIME_HIRES => eval { require Time::HiRes; };
use constant HAS_MSA_CLIENT => eval { require Mail::SpamAssassin::Client; };
use constant HAS_MSA_TIMEOUT => eval { require Mail::SpamAssassin::Timeout; };
use Mail::SpamAssassin::Util;

### nagios plugin return codes: 0 OK / 1 Warning / 2 Critical / 3 Unknown ###
use constant EX_OK	 => 0;
use constant EX_WARNING	 => 1;
use constant EX_CRITICAL => 2;
use constant EX_UNKNOWN	 => 3;

my $VERSION = $Mail::SpamAssassin::VERSION;

my %opt = (
  'critical'	=> undef,
  'hostname'	=> undef,
  'port'	=> undef,
  'socketpath'	=> undef,
  'timeout'	=> 45,
  'verbose'	=> undef,
  'warning'	=> undef,
);

# Parse the command line
Getopt::Long::Configure("bundling");
GetOptions(
  'critical|c=s'	=> \$opt{'critical'},
  'help|h|?'		=> sub { print_usage_and_exit(); },
  'hostname|H=s'	=> \$opt{'hostname'},
  'port|p=s'		=> \$opt{'port'},
  'socketpath=s'	=> \$opt{'socketpath'},
  'timeout|t=s'		=> \$opt{'timeout'},
  'verbose|v'		=> \$opt{'verbose'},
  'version|V'		=> sub { print "sa-check_spamd version $VERSION\n"; exit EX_UNKNOWN; },
  'warning|w=s'		=> \$opt{'warning'},

) or print_usage_and_exit();


if (defined $opt{'critical'}) {
  if ($opt{'critical'} =~ /^(\d+(?:\.\d*)?)$/) {
    $opt{'critical'} = $1;
  } else {
    print "SPAMD UNKNOWN: invalid critical config value provided\n";
    exit EX_UNKNOWN;
  }
}

if (defined $opt{'hostname'}) {
  if ($opt{'hostname'} =~ /^([A-Za-z0-9_.:-]+)$/) {
    $opt{'hostname'} = $1;
  } else {
    print "SPAMD UNKNOWN: invalid hostname config value provided\n";
    exit EX_UNKNOWN;
  }
}

if (defined $opt{'port'}) {
  if ($opt{'port'} =~ /^(\d+)$/) {
    $opt{'port'} = $1;
  } else {
    print "SPAMD UNKNOWN: invalid port config value provided\n";
    exit EX_UNKNOWN;
  }
}

# TODO: --socketpath isn't checked, suboptimal

if ($opt{'timeout'} =~ /^(\d+(?:\.\d*)?)$/ && $opt{'timeout'} >= 1) {
  $opt{'timeout'} = $1;
} else {
  print "SPAMD UNKNOWN: invalid timeout config value provided\n";
  exit EX_UNKNOWN;
}

if (defined $opt{'warning'}) {
  if ($opt{'warning'} =~ /^(\d+(?:\.\d*)?)$/) {
    $opt{'warning'} = $1;
  } else {
    print "SPAMD UNKNOWN: invalid warning config value provided\n";
    exit EX_UNKNOWN;
  }
}

# logic checking
if (defined $opt{'critical'} && defined $opt{'warning'} &&
	$opt{'critical'} < $opt{'warning'}) {
  print "SPAMD UNKNOWN: critical value is less than warning value, config not valid\n";
  exit EX_UNKNOWN;
}

if (defined $opt{'critical'} && defined $opt{'timeout'} &&
	$opt{'critical'} > $opt{'timeout'}) {
  print "SPAMD UNKNOWN: critical value is greater than timeout value, config not valid\n";
  exit EX_UNKNOWN;
}

if (defined $opt{'warning'} && defined $opt{'timeout'} &&
	$opt{'warning'} > $opt{'timeout'}) {
  print "SPAMD UNKNOWN: warning value is greater than timeout value, config not valid\n";
  exit EX_UNKNOWN;
}

# check to make sure that both TCP and UNIX domain socket info wasn't provided
if ((defined $opt{'hostname'} || defined $opt{'port'}) && defined $opt{'socketpath'}) {
  print "SPAMD UNKNOWN: both TCP and UNIX domain socket info provided, only one can be used\n";
  exit EX_UNKNOWN;
}

# if not provided with a spamd service to connect to set some defaults
unless (defined $opt{'socketpath'}) {
  $opt{'hostname'} ||= 'localhost';
  $opt{'port'} ||= 783;
}


if ($opt{'verbose'}) {
  print ((HAS_MSA_CLIENT ? "loaded" : "failed to load") ." Mail::SpamAssassin::Client\n");
  print ((HAS_MSA_TIMEOUT ? "loaded" : "failed to load") ." Mail::SpamAssassin::Timeout\n");
}

# If there's no client available, there's no way to check the service...
unless (HAS_MSA_CLIENT && HAS_MSA_TIMEOUT) {
  # Nagios will only display the first line printed.
  print "SPAMD UNKNOWN: could not load M:SA::Client\n" unless HAS_MSA_CLIENT;
  print "SPAMD UNKNOWN: could not load M:SA::Timeout\n" unless HAS_MSA_TIMEOUT;
  print "cannot continue\n" if $opt{'verbose'};
  exit EX_UNKNOWN;
}


# untaint the command-line args; since the root user supplied these, and
# we're not a setuid script, we trust them.  This needs to be called explicitly
foreach my $optkey (keys %opt) {
  next if ref $opt{$optkey};
  Mail::SpamAssassin::Util::untaint_var(\$opt{$optkey});
}


# If the client connection fails it'll spit out it's own error message which
# is probably more appropriate than anything we can provide to Nagios ourself.
# We'll still spit out something later, but Nagios will ignore it since it
# only uses the first line of output.
my $client;
if (defined $opt{'port'}) {
 $client = new Mail::SpamAssassin::Client({port => $opt{'port'},
					   host => $opt{'hostname'}});
} else {
 $client = new Mail::SpamAssassin::Client({socketpath => $opt{'socketpath'}});
}

# this'd be weird, but totally dependent on the client
unless (defined $client) {
  print "SPAMD UNKNOWN: could not create M::SA::Client instance\n";
  print "failed to create Mail::SpamAssassin::Client instance\n" if $opt{'verbose'};
  exit EX_UNKNOWN;
}

# until we try a ping, the ping response status is unknown
my $response = -1;
print "connecting to spamd for ping\n" if $opt{'verbose'};

my $timer = Mail::SpamAssassin::Timeout->new({ secs => $opt{'timeout'}});
my $t0 = (HAS_TIME_HIRES ? Time::HiRes::time() : time());

my $err = $timer->run(sub {
  if ($client->ping()) {
    $response = 1;
  } else {
    $response = 0;
  }
});

my $elapsed = (HAS_TIME_HIRES ? Time::HiRes::time() : time()) - $t0;


# a ping response should be most common, we'll handle it first
if ($response == 1) {
  # it's possible that we may timeout right after setting the response status to 1
  # since the timeout value > the critical value, this is a critical state
  if ((defined $opt{'critical'} && $elapsed > $opt{'critical'}) || $timer->timed_out()) {
    printf("SPAMD CRITICAL: %.3f second ping response time\n", $elapsed);
    exit EX_CRITICAL;
  }

  # warning state will never timeout since that'd be critical (above)
  if (defined $opt{'warning'} && ($elapsed > $opt{'warning'})) {
    printf("SPAMD WARNING: %.3f second ping response time\n", $elapsed);
    exit EX_WARNING;
  }

  # otherwise we got a timely ping response
  printf("SPAMD OK: %.3f second ping repsonse time\n", $elapsed);
  exit EX_OK;
}

# any way we get a failed ping response is a critical state
if ($response == 0) {
  printf("SPAMD CRITICAL: ping failed in %.3f seconds\n", $elapsed);
  exit EX_CRITICAL;
}

if ($response == -1) {
  # this is the common timeout scenario
  if ($timer->timed_out()) {
    printf("SPAMD CRITICAL: ping timed out in %.3f seconds\n", $elapsed);
    exit EX_CRITICAL;
  }

  # dos: I'll buy lunch for the first person that gets a page about this while
  # they're sleeping if they come to Midland, ON to get it
  printf("SPAMD UNKNOWN: assertion! unknown ping response status without timeout after %.3f seconds\n", $elapsed);
  exit EX_UNKNOWN;
}

# and some apple pie too
exit EX_UNKNOWN;


#############################################################################

sub print_usage_and_exit {
  print <<EOF;
sa-check_spamd version $VERSION

For more details, use "perldoc sa-check_spamd".

Usage:
   sa-check_spamd [options]

    Options:

     -c secs, --critical=secs          Critical ping response threshold
     -h, -?, --help                    Print usage message
     -H hostname, --hostname=hostname  Hostname of spamd service to ping
     -p port, --port=port              Port of spamd service to ping
     --socketpath=path                 Connect to given UNIX domain socket
     -t secs, --timeout=secs           Max time to wait for a ping response
     -v, --verbose                     Verbose debug output
     -V, --version                     Output version info
     -w secs, --warning=secs           Warning ping response threshold

EOF

  exit EX_UNKNOWN;
}

# Don't use a __DATA__ here, it screws up embedded Perl Nagios (ePN)

=head1 NAME

sa-check_spamd - spamd monitoring script for use with Nagios, etc.

=head1 SYNOPSIS

sa-check_spamd [options]

Options:

 -c secs, --critical=secs          Critical ping response threshold
 -h, -?, --help                    Print usage message
 -H hostname, --hostname=hostname  Hostname of spamd service to ping
 -p port, --port=port              Port of spamd service to ping
 --socketpath=path                 Connect to given UNIX domain socket
 -t secs, --timeout=secs           Max time to wait for a ping response
 -v, --verbose                     Verbose debug output
 -V, --version                     Output version info
 -w secs, --warning=secs           Warning ping response threshold


=head1 DESCRIPTION

The purpose of this program is to provide a tool to monitor the status of
C<spamd> server processes.  spamd is the daemonized version of the
spamassassin executable, both provided in the SpamAssassin distribution.

This program is designed for use, as a plugin, with the Nagios service
monitoring software available from http://nagios.org.  It might be compatible
with other service monitoring packages.  It is also useful as a command line
utility or as a component of a custom shell script.

=head1 OPTIONS

Options of the long form can be shortened as long as the remain
unambiguous (i.e. B<--host> can be used instead of B<--hostname>).

=over 4

=item B<-c> I<secs>, B<--critical>=I<secs>

Critical ping response threshold in seconds.  If a spamd ping response takes
longer than the value specified (in seconds) the program will exit with a
value of 2 to indicate the critical status.

This value must be at least as long as the value specified for B<warning> and
less than the value specified for B<timeout>.

=item B<-h>, B<-?>, B<--help>

Prints this usage message and exits.

=item B<-H> I<hostname>, B<--hostname>=I<hostname>

The hostname, or IP address, of the spamd service to ping.  By default the
hostname B<localhost> is used.  If B<--socketpath> is set this value will be
ignored.

=item B<-p> I<port>, B<--port>=I<port>

The port of the spamd service to ping.  By default port B<783> (the spamd
default port number) is used.  If B<--socketpath> is set this value will be
ignored.

=item B<--socketpath>=I<path>

Connect to given UNIX domain socket.  Use instead of a hostname and TCP port.
When set, any hostname and TCP port specified will be ignored.

=item B<-t> I<secs>, B<--timeout>=I<secs>

The maximum time to wait for a ping response.  Once exceeded the program will
exit with a value of 2 to indicate the critical status.  The default timeout
value is 45 seconds.  The timeout must be no less than 1 second.

This value must be greater than the values specified for both the B<critical>
and B<warning> values.

=item B<-v>, B<--verbose>

Display verbose debug output on STDOUT.

=item B<-V>, B<--version>

Display version info on STDOUT.

=item B<-w> I<secs>, B<--warning>=I<secs>

Warning ping response threshold in seconds.  If a spamd ping response takes
longer than the value specified (in seconds), and does not exceed the
B<critical> threshold value, the program will exit with a value of 1 to
indicate the warning staus.

This value must be no longer than the value specified for B<critical> and
less than the value specified for B<timeout>.

=back

=head1 EXIT CODES

The program will indicate the status of the spamd process being monitored by
exiting with one of these values:

=over 4

=item C<0>

OK: A spamd ping response was received within all threshold times.

=item C<1>

WARNING: A spamd ping response exceeded the warning threshold but not the
critical threshold.

=item C<2>

CRITICAL: A spamd ping response exceeded either the critical threshold or the
timeout value.

=item C<3>

UNKNOWN: An error, probably caused by a missing dependency or an invalid
configuration parameter being supplied, occurred in the sa-check_spamd program.

=back

=head1 SEE ALSO

spamc(1)
spamd(1)
spamassassin(1)

=head1 PREREQUISITES

C<Mail::SpamAssassin> version 3.1.1 or higher (3.1.6 or higher recommended)

=head1 AUTHOR

Daryl C. W. O'Shea, DOS Technologies <spamassassin@dostech.ca>

=head1 COPYRIGHT AND LICENSE

sa-check_spamd is distributed under the Apache License, Version 2.0, as
described in the file C<LICENSE> included with the Apache SpamAssassin
distribution and available at http://www.apache.org/licenses/LICENSE-2.0

Copyright (C) 2015 The Apache Software Foundation

=cut