#! /usr/bin/perl -w

my %ERRORS=( OK => 0, WARNING => 1, CRITICAL => 2, UNKNOWN => 3 );
my %ERRORCODES=( 0 => 'OK', 1 => 'WARNING', 2 => 'CRITICAL', 3 => 'UNKNOWN' );
package DBD::MSSQL::Server::Memorypool;

use strict;

our @ISA = qw(DBD::MSSQL::Server);


sub new {
  my $class = shift;
  my %params = @_;
  my $self = {
    handle => $params{handle},
    buffercache => undef,
    procedurecache => undef,
    locks => [],
  };
  bless $self, $class;
  $self->init(%params);
  return $self;
}

sub init {
  my $self = shift;
  my %params = @_;
  $self->init_nagios();
  if ($params{mode} =~ /server::memorypool::buffercache/) {
    $self->{buffercache} = DBD::MSSQL::Server::Memorypool::BufferCache->new(
        %params);
  } elsif ($params{mode} =~ /server::memorypool::procedurecache/) {
    $self->{procedurecache} = DBD::MSSQL::Server::Memorypool::ProcedureCache->new(
        %params);
  } elsif ($params{mode} =~ /server::memorypool::lock/) {
    DBD::MSSQL::Server::Memorypool::Lock::init_locks(%params);
    if (my @locks = DBD::MSSQL::Server::Memorypool::Lock::return_locks()) {
      $self->{locks} = \@locks;
    } else {
      $self->add_nagios_critical("unable to aquire lock info");
    }
  }
}

sub nagios {
  my $self = shift;
  my %params = @_;
  if ($params{mode} =~ /server::memorypool::buffercache/) {
    $self->{buffercache}->nagios(%params);
    $self->merge_nagios($self->{buffercache});
  } elsif ($params{mode} =~ /^server::memorypool::lock::listlocks/) {
    foreach (sort { $a->{name} cmp $b->{name}; }  @{$self->{locks}}) {
      printf "%s\n", $_->{name};
    }
    $self->add_nagios_ok("have fun");
  } elsif ($params{mode} =~ /^server::memorypool::lock/) {
    foreach (@{$self->{locks}}) {
      $_->nagios(%params);
      $self->merge_nagios($_);
    }
  }
}


package DBD::MSSQL::Server::Memorypool::BufferCache;

use strict;

our @ISA = qw(DBD::MSSQL::Server::Memorypool);


sub new {
  my $class = shift;
  my %params = @_;
  my $self = {
    handle => $params{handle},
    hitratio => undef,
    warningrange => $params{warningrange},
    criticalrange => $params{criticalrange},
  };
  bless $self, $class;
  $self->init(%params);
  return $self;
}

sub init {
  my $self = shift;
  my %params = @_;
  $self->init_nagios();
  if ($params{mode} =~ /server::memorypool::buffercache::hitratio/) {
    #        -- (a.cntr_value * 1.0 / b.cntr_value) * 100.0 [BufferCacheHitRatio]
    $self->{cnt_hitratio} = $self->{handle}->get_perf_counter(
        "SQLServer:Buffer Manager", "Buffer cache hit ratio");
    $self->{cnt_hitratio_base} = $self->{handle}->get_perf_counter(
        "SQLServer:Buffer Manager", "Buffer cache hit ratio base");
    if (! defined $self->{cnt_hitratio}) {
      $self->add_nagios_unknown("unable to aquire buffer cache data");
    } else {
      # das kracht weil teilweise negativ
      #$self->valdiff(\%params, qw(cnt_hitratio cnt_hitratio_base));
      $self->{hitratio} = ($self->{cnt_hitratio_base} == 0) ?
          100 : $self->{cnt_hitratio} / $self->{cnt_hitratio_base} * 100.0;
      # soll vorkommen.....
      $self->{hitratio} = 100 if ($self->{hitratio} > 100);
    }
  } elsif ($params{mode} =~ /server::memorypool::buffercache::lazywrites/) {
    $self->{lazy_writes_s} = $self->{handle}->get_perf_counter(
        "SQLServer:Buffer Manager", "Lazy writes/sec");
    if (! defined $self->{lazy_writes_s}) {
      $self->add_nagios_unknown("unable to aquire buffer manager data");
    } else {
      $self->valdiff(\%params, qw(lazy_writes_s));
      $self->{lazy_writes_per_sec} = $self->{delta_lazy_writes_s} / $self->{delta_timestamp};
    }
  } elsif ($params{mode} =~ /server::memorypool::buffercache::pagelifeexpectancy/) {
    $self->{pagelifeexpectancy} = $self->{handle}->get_perf_counter(
        "SQLServer:Buffer Manager", "Page life expectancy");
    if (! defined $self->{pagelifeexpectancy}) {
      $self->add_nagios_unknown("unable to aquire buffer manager data");
    }
  } elsif ($params{mode} =~ /server::memorypool::buffercache::freeliststalls/) {
    $self->{freeliststalls_s} = $self->{handle}->get_perf_counter(
        "SQLServer:Buffer Manager", "Free list stalls/sec");
    if (! defined $self->{freeliststalls_s}) {
      $self->add_nagios_unknown("unable to aquire buffer manager data");
    } else {
      $self->valdiff(\%params, qw(freeliststalls_s));
      $self->{freeliststalls_per_sec} = $self->{delta_freeliststalls_s} / $self->{delta_timestamp};
    }
  } elsif ($params{mode} =~ /server::memorypool::buffercache::checkpointpages/) {
    $self->{checkpointpages_s} = $self->{handle}->get_perf_counter(
        "SQLServer:Buffer Manager", "Checkpoint pages/sec");
    if (! defined $self->{checkpointpages_s}) {
      $self->add_nagios_unknown("unable to aquire buffer manager data");
    } else {
      $self->valdiff(\%params, qw(checkpointpages_s));
      $self->{checkpointpages_per_sec} = $self->{delta_checkpointpages_s} / $self->{delta_timestamp};
    }
  }
}

sub nagios {
  my $self = shift;
  my %params = @_;
  if (! $self->{nagios_level}) {
    if ($params{mode} =~ /server::memorypool::buffercache::hitratio/) {
      $self->add_nagios(
          $self->check_thresholds($self->{hitratio}, '90:', '80:'),
          sprintf "buffer cache hit ratio is %.2f%%", $self->{hitratio});
      $self->add_perfdata(sprintf "buffer_cache_hit_ratio=%.2f%%;%s;%s",
          $self->{hitratio},
          $self->{warningrange}, $self->{criticalrange});
      #$self->add_perfdata(sprintf "buffer_cache_hit_ratio_now=%.2f%%",
      #    $self->{hitratio_now});
    } elsif ($params{mode} =~ /server::memorypool::buffercache::lazywrites/) {
      $self->add_nagios(
          $self->check_thresholds($self->{lazy_writes_per_sec}, '20', '40'),
          sprintf "%.2f lazy writes per second", $self->{lazy_writes_per_sec});
      $self->add_perfdata(sprintf "lazy_writes_per_sec=%.2f;%s;%s",
          $self->{lazy_writes_per_sec},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /server::memorypool::buffercache::pagelifeexpectancy/) {
      $self->add_nagios(
          $self->check_thresholds($self->{pagelifeexpectancy}, '300:', '180:'),
          sprintf "page life expectancy is %d seconds", $self->{pagelifeexpectancy});
      $self->add_perfdata(sprintf "page_life_expectancy=%d;%s;%s",
          $self->{pagelifeexpectancy},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /server::memorypool::buffercache::freeliststalls/) {
      $self->add_nagios(
          $self->check_thresholds($self->{freeliststalls_per_sec}, '4', '10'),
          sprintf "%.2f free list stalls per second", $self->{freeliststalls_per_sec});
      $self->add_perfdata(sprintf "free_list_stalls_per_sec=%.2f;%s;%s",
          $self->{freeliststalls_per_sec},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /server::memorypool::buffercache::checkpointpages/) {
      $self->add_nagios(
          $self->check_thresholds($self->{checkpointpages_per_sec}, '100', '500'),
          sprintf "%.2f pages flushed per second", $self->{checkpointpages_per_sec});
      $self->add_perfdata(sprintf "checkpoint_pages_per_sec=%.2f;%s;%s",
          $self->{checkpointpages_per_sec},
          $self->{warningrange}, $self->{criticalrange});
    }
  }
}





package DBD::MSSQL::Server::Memorypool::Lock;

use strict;

our @ISA = qw(DBD::MSSQL::Server::Memorypool);


{
  my @locks = ();
  my $initerrors = undef;

  sub add_lock {
    push(@locks, shift);
  }

  sub return_locks {
    return reverse
        sort { $a->{name} cmp $b->{name} } @locks;
  }

  sub init_locks {
    my %params = @_;
    my $num_locks = 0;
    if (($params{mode} =~ /server::memorypool::lock::listlocks/) ||
        ($params{mode} =~ /server::memorypool::lock::waits/) ||
        ($params{mode} =~ /server::memorypool::lock::deadlocks/) ||
        ($params{mode} =~ /server::memorypool::lock::timeouts/)) {
      my @lockresult = $params{handle}->get_instance_names(
          'SQLServer:Locks');
      foreach (@lockresult) {
        my ($name) = @{$_};
        $name =~ s/\s*$//;
        if ($params{regexp}) {
          next if $params{selectname} && $name !~ /$params{selectname}/;
        } else {
          next if $params{selectname} && lc $params{selectname} ne lc $name;
        }
        my %thisparams = %params;
        $thisparams{name} = $name;
        my $lock = DBD::MSSQL::Server::Memorypool::Lock->new(
            %thisparams);
        add_lock($lock);
        $num_locks++;
      }
      if (! $num_locks) {
        $initerrors = 1;
        return undef;
      }
    }
  }

}

sub new {
  my $class = shift;
  my %params = @_;
  my $self = {
    handle => $params{handle},
    warningrange => $params{warningrange},
    criticalrange => $params{criticalrange},
    name => $params{name},
  };
  bless $self, $class;
  $self->init(%params);
  return $self;
}

sub init {
  my $self = shift;
  my %params = @_;
  $self->init_nagios();
  if ($params{mode} =~ /server::memorypool::lock::listlocks/) {
    # name reicht
  } elsif ($params{mode} =~ /server::memorypool::lock::waits/) {
    $self->{lock_waits_s} = $self->{handle}->get_perf_counter_instance(
        "SQLServer:Locks", "Lock Waits/sec", $self->{name});
    if (! defined $self->{lock_waits_s}) {
      $self->add_nagios_unknown("unable to aquire counter data");
    } else {
      $self->valdiff(\%params, qw(lock_waits_s));
      $self->{lock_waits_per_sec} = $self->{delta_lock_waits_s} / $self->{delta_timestamp};
    }
  } elsif ($params{mode} =~ /^server::memorypool::lock::timeouts/) {
    $self->{lock_timeouts_s} = $self->{handle}->get_perf_counter_instance(
        "SQLServer:Locks", "Lock Timeouts/sec", $self->{name});
    if (! defined $self->{lock_timeouts_s}) {
      $self->add_nagios_unknown("unable to aquire counter data");
    } else {
      $self->valdiff(\%params, qw(lock_timeouts_s));
      $self->{lock_timeouts_per_sec} = $self->{delta_lock_timeouts_s} / $self->{delta_timestamp};
    }
  } elsif ($params{mode} =~ /^server::memorypool::lock::deadlocks/) {
    $self->{lock_deadlocks_s} = $self->{handle}->get_perf_counter_instance(
        "SQLServer:Locks", "Number of Deadlocks/sec", $self->{name});
    if (! defined $self->{lock_deadlocks_s}) {
      $self->add_nagios_unknown("unable to aquire counter data");
    } else {
      $self->valdiff(\%params, qw(lock_deadlocks_s));
      $self->{lock_deadlocks_per_sec} = $self->{delta_lock_deadlocks_s} / $self->{delta_timestamp};
    }
  }
}

sub nagios {
  my $self = shift;
  my %params = @_;
  if (! $self->{nagios_level}) {
    if ($params{mode} =~ /server::memorypool::lock::waits/) {
      $self->add_nagios(
          $self->check_thresholds($self->{lock_waits_per_sec}, 100, 500),
          sprintf "%.4f lock waits / sec for %s",
          $self->{lock_waits_per_sec}, $self->{name});
      $self->add_perfdata(sprintf "%s_lock_waits_per_sec=%.4f;%s;%s",
          $self->{name}, $self->{lock_waits_per_sec},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /^server::memorypool::lock::timeouts/) {
      $self->add_nagios(
          $self->check_thresholds($self->{lock_timeouts_per_sec}, 1, 5),
          sprintf "%.4f lock timeouts / sec for %s",
          $self->{lock_timeouts_per_sec}, $self->{name});
      $self->add_perfdata(sprintf "%s_lock_timeouts_per_sec=%.4f;%s;%s",
          $self->{name}, $self->{lock_timeouts_per_sec},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /^server::memorypool::lock::deadlocks/) {
      $self->add_nagios(
          $self->check_thresholds($self->{lock_deadlocks_per_sec}, 1, 5),
          sprintf "%.4f deadlocks / sec for %s",
          $self->{lock_deadlocks_per_sec}, $self->{name});
      $self->add_perfdata(sprintf "%s_deadlocks_per_sec=%.4f;%s;%s",
          $self->{name}, $self->{lock_deadlocks_per_sec},
          $self->{warningrange}, $self->{criticalrange});
    }
  }
}


package DBD::MSSQL::Server::Memorypool::SystemLevelDataStructures::LockTable;
package DBD::MSSQL::Server::Memorypool::ProcedureCache;
package DBD::MSSQL::Server::Memorypool::LogCache;
package DBD::MSSQL::Server::Memorypool::SystemLevelDataStructures;
package DBD::MSSQL::Server::Database::Datafile;

use strict;
use File::Basename;

our @ISA = qw(DBD::MSSQL::Server::Database);


{
  my @datafiles = ();
  my $initerrors = undef;

  sub add_datafile {
    push(@datafiles, shift);
  }

  sub return_datafiles {
    return reverse
        sort { $a->{logicalfilename} cmp $b->{logicalfilename} } @datafiles;
  }

  sub clear_datafiles {
    @datafiles = ();
  }

  sub init_datafiles {
    my %params = @_;
    my $num_datafiles = 0;
    if ($params{mode} =~ /server::database::datafile::listdatafiles/) {
      my @datafileresults = $params{handle}->fetchall_array(q{
DECLARE @DBInfo TABLE
( ServerName VARCHAR(100),
DatabaseName VARCHAR(100),
FileSizeMB INT,
LogicalFileName sysname,
PhysicalFileName NVARCHAR(520),
Status sysname,
Updateability sysname,
RecoveryMode sysname,
FreeSpaceMB INT,
FreeSpacePct VARCHAR(7),
FreeSpacePages INT,
PollDate datetime)

DECLARE @command VARCHAR(5000)

SELECT @command = 'Use [' + '?' + '] SELECT
@@servername as ServerName,
' + '''' + '?' + '''' + ' AS DatabaseName,
CAST(sysfiles.size/128.0 AS int) AS FileSize,
sysfiles.name AS LogicalFileName, sysfiles.filename AS PhysicalFileName,
CONVERT(sysname,DatabasePropertyEx(''?'',''Status'')) AS Status,
CONVERT(sysname,DatabasePropertyEx(''?'',''Updateability'')) AS Updateability,
CONVERT(sysname,DatabasePropertyEx(''?'',''Recovery'')) AS RecoveryMode,
CAST(sysfiles.size/128.0 - CAST(FILEPROPERTY(sysfiles.name, ' + '''' +
       'SpaceUsed' + '''' + ' ) AS int)/128.0 AS int) AS FreeSpaceMB,
CAST(100 * (CAST (((sysfiles.size/128.0 -CAST(FILEPROPERTY(sysfiles.name,
' + '''' + 'SpaceUsed' + '''' + ' ) AS int)/128.0)/(sysfiles.size/128.0))
AS decimal(4,2))) AS varchar(8)) + ' + '''' + '%' + '''' + ' AS FreeSpacePct,
GETDATE() as PollDate FROM dbo.sysfiles'
INSERT INTO @DBInfo
   (ServerName,
   DatabaseName,
   FileSizeMB,
   LogicalFileName,
   PhysicalFileName,
   Status,
   Updateability,
   RecoveryMode,
   FreeSpaceMB,
   FreeSpacePct,
   PollDate)
EXEC sp_MSForEachDB @command

SELECT
   ServerName,
   DatabaseName,
   FileSizeMB,
   LogicalFileName,
   PhysicalFileName,
   Status,
   Updateability,
   RecoveryMode,
   FreeSpaceMB,
   FreeSpacePct,
   PollDate
FROM @DBInfo
ORDER BY
   ServerName,
   DatabaseName
      });
      if (DBD::MSSQL::Server::return_first_server()->windows_server()) {
        fileparse_set_fstype("MSWin32");
      }
      foreach (@datafileresults) {
        my ($servername, $databasename, $filesizemb, $logicalfilename,
            $physicalfilename, $status, $updateability, $recoverymode,
            $freespacemb, $freespacepct, $polldate) = @{$_};
        next if $databasename ne $params{database};
        if ($params{regexp}) {
          #next if $params{selectname} &&
          #    (($name !~ /$params{selectname}/) &&
          #    (basename($name) !~ /$params{selectname}/));
          next if $params{selectname} &&
              ($logicalfilename !~ /$params{selectname}/);
        } else {
          #next if $params{selectname} &&
          #    ((lc $params{selectname} ne lc $name) &&
          #    (lc $params{selectname} ne lc basename($name)));
          next if $params{selectname} &&
              (lc $params{selectname} ne lc $logicalfilename);
        }
        my %thisparams = %params;
        $thisparams{servername} = $servername;
        $thisparams{databasename} = $databasename;
        $thisparams{filesizemb} = $filesizemb;
        $thisparams{logicalfilename} = $logicalfilename;
        $thisparams{servername} = $servername;
        $thisparams{status} = $status;
        $thisparams{updateability} = $updateability;
        $thisparams{recoverymode} = $recoverymode;
        $thisparams{freespacemb} = $freespacemb;
        $thisparams{freespacepct} = $freespacepct;
        $thisparams{polldate} = $polldate;
        my $datafile = 
            DBD::MSSQL::Server::Database::Datafile->new(
            %thisparams);
        add_datafile($datafile);
        $num_datafiles++;
      }
    }
  }

}

sub new {
  my $class = shift;
  my %params = @_;
  my $self = {
    handle => $params{handle},
    databasename => $params{databasename},
    filesizemb => $params{filesizemb},
    logicalfilename => $params{logicalfilename},
    physicalfilename => $params{physicalfilename},
    status => $params{status},
    updateability => $params{updateability},
    recoverymode => $params{recoverymode},
    freespacemb => $params{freespacemb},
    freespacepct => $params{freespacepct},
    freespacepages => $params{freespacepages},
    polldate => $params{polldate},
    warningrange => $params{warningrange},
    criticalrange => $params{criticalrange},
  };
  bless $self, $class;
  $self->init(%params);
  return $self;
}

sub init { 
  my $self = shift;
  my %params = @_;
  $self->init_nagios();
  if ($params{mode} =~ /server::database::iobalance/) {
    if (! defined $self->{phyrds}) {
      $self->add_nagios_critical(sprintf "unable to read datafile io %s", $@);
    } else {
      $params{differenciator} = $self->{path};
      $self->valdiff(\%params, qw(phyrds phywrts));
      $self->{io_total} = $self->{delta_phyrds} + $self->{delta_phywrts};
    }
  } elsif ($params{mode} =~ /server::database::datafile::iotraffic/) {
    if (! defined $self->{phyrds}) {
      $self->add_nagios_critical(sprintf "unable to read datafile io %s", $@);
    } else {
      $params{differenciator} = $self->{path};
      $self->valdiff(\%params, qw(phyrds phywrts));
      $self->{io_total_per_sec} = ($self->{delta_phyrds} + $self->{delta_phywrts}) /
          $self->{delta_timestamp};
    }
  }
}


sub nagios {
  my $self = shift;
  my %params = @_;
  if (! $self->{nagios_level}) {
    if ($params{mode} =~ /server::database::datafile::iotraffic/) {
      $self->add_nagios(
          $self->check_thresholds($self->{io_total_per_sec}, "1000", "5000"),
          sprintf ("%s: %.2f IO Operations per Second", 
              $self->{name}, $self->{io_total_per_sec}));
      $self->add_perfdata(sprintf "'dbf_%s_io_total_per_sec'=%.2f;%d;%d",
          $self->{name}, $self->{io_total_per_sec},
          $self->{warningrange}, $self->{criticalrange});
    }
  }
}

package DBD::MSSQL::Server::Database;

use strict;

our @ISA = qw(DBD::MSSQL::Server);


{
  my @databases = ();
  my $initerrors = undef;

  sub add_database {
    push(@databases, shift);
  }

  sub return_databases {
    return reverse
        sort { $a->{name} cmp $b->{name} } @databases;
  }

  sub init_databases {
    my %params = @_;
    my $num_databases = 0;
    if (($params{mode} =~ /server::database::listdatabases/) ||
        ($params{mode} =~ /server::database::databasefree/) ||
        ($params{mode} =~ /server::database::lastbackup/) ||
        ($params{mode} =~ /server::database::transactions/) ||
        ($params{mode} =~ /server::database::datafile/)) {
      my @databaseresult = ();
      if (DBD::MSSQL::Server::return_first_server()->version_is_minimum("9.x")) {
        @databaseresult = $params{handle}->fetchall_array(q{
          SELECT name, database_id FROM master.sys.databases
        });
      } else {
        #@databaseresult = map {
        #  [ $_->[0], $_->[3] ] # only name, dbid
        #} $params{handle}->fetchall_array(q{exec sp_helpdb});
        @databaseresult = $params{handle}->fetchall_array(q{
          SELECT name, dbid FROM master.dbo.sysdatabases
        });
      }
      if ($params{mode} =~ /server::database::transactions/) {
        push(@databaseresult, [ '_Total', 0 ]);
      }
      foreach (@databaseresult) {
        my ($name, $id) = @{$_};
        next if $params{database} && $name ne $params{database};
        if ($params{regexp}) {
          next if $params{selectname} && $name !~ /$params{selectname}/;
        } else {
          next if $params{selectname} && lc $params{selectname} ne lc $name;
        }
        my %thisparams = %params;
        $thisparams{name} = $name;
        $thisparams{id} = $id;
        my $database = DBD::MSSQL::Server::Database->new(
            %thisparams);
        add_database($database);
        $num_databases++;
      }
      if (! $num_databases) {
        $initerrors = 1;
        return undef;
      }
    } elsif ($params{mode} =~ /server::database::backupage/) {
      my @databaseresult = ();
      if (DBD::MSSQL::Server::return_first_server()->version_is_minimum("9.x")) {
        @databaseresult = $params{handle}->fetchall_array(q{
          SELECT
            a.name, 
            DATEDIFF(HH, MAX(b.backup_finish_date), GETDATE()),
            DATEDIFF(MI, MAX(b.backup_start_date), MAX(b.backup_finish_date))
          FROM sys.sysdatabases a LEFT OUTER JOIN msdb.dbo.backupset b
          ON b.database_name = a.name
          GROUP BY a.name 
          ORDER BY a.name
        });
      } else {
        @databaseresult = $params{handle}->fetchall_array(q{
          SELECT
            a.name, 
            DATEDIFF(HH, MAX(b.backup_finish_date), GETDATE()),
            DATEDIFF(MI, MAX(b.backup_start_date), MAX(b.backup_finish_date))
          FROM master.dbo.sysdatabases a LEFT OUTER JOIN msdb.dbo.backupset b
          ON b.database_name = a.name
          GROUP BY a.name 
          ORDER BY a.name 
        }); 
      }
      foreach (sort {
        if (! defined $b->[1]) {
          return 1;
        } elsif (! defined $a->[1]) {
          return -1;
        } else {
          return $a->[1] <=> $b->[1];
        }
      } @databaseresult) { 
        my ($name, $age, $duration) = @{$_};
        next if $params{database} && $name ne $params{database};
        if ($params{regexp}) { 
          next if $params{selectname} && $name !~ /$params{selectname}/;
        } else {
          next if $params{selectname} && lc $params{selectname} ne lc $name;
        }
        my %thisparams = %params;
        $thisparams{name} = $name;
        $thisparams{backup_age} = $age;
        $thisparams{backup_duration} = $duration;
        my $database = DBD::MSSQL::Server::Database->new(
            %thisparams);
        add_database($database);
        $num_databases++;
      }
    }

  }

}

sub new {
  my $class = shift;
  my %params = @_;
  my $self = {
    handle => $params{handle},
    warningrange => $params{warningrange},
    criticalrange => $params{criticalrange},
    name => $params{name},
    id => $params{id},
    datafiles => [],
    backup_age => $params{backup_age},
    backup_duration => $params{backup_duration},
  };
  bless $self, $class;
  $self->init(%params);
  return $self;
}

sub init {
  my $self = shift;
  my %params = @_;
  $self->init_nagios();
  if ($params{mode} =~ /server::database::datafile/) {
    $params{database} = $self->{name};
    DBD::MSSQL::Server::Database::Datafile::init_datafiles(%params);
    if (my @datafiles = 
        DBD::MSSQL::Server::Database::Datafile::return_datafiles()) {
      $self->{datafiles} = \@datafiles;
    } else {
      $self->add_nagios_critical("unable to aquire datafile info");
    }
  } elsif ($params{mode} =~ /server::database::databasefree/) {
    ###################################################################################
    #                            fuer's museum
    # 1> sp_spaceused
    # 2> go
    # database_name   database_size   unallocated space
    # master  4.50 MB 1.32 MB
    # reserved        data    index_size      unused
    # 2744 KB 1056 KB 1064 KB 624 KB
    # (return status = 0)
    #my($database_name, $database_size, $unallocated_space,
    #    $reserved, $data, $index_size, $unused) =
    #     $params{handle}->fetchrow_array(
    #    "USE ".$self->{name}."\nEXEC SP_SPACEUSED"
    #);
    # server mgmt studio           sp_spaceused
    # Currently Allocated Space    database_size       641.94MB
    # Available Free Space         unallocated space   457.09MB 
    #$database_size =~ s/MB//g;
    #$unallocated_space =~ s/MB//g;
    #$self->{size} = $database_size * 1024 * 1024;
    #$self->{free} = $unallocated_space * 1024 * 1024;
    #$self->{percent_free} = $unallocated_space / $database_size * 100;
    #$self->{used} = $self->{size} - $self->{free};
    #$self->{maxsize} = "99999999999999999";
    ###################################################################################
    my $calc = {};
    $self->{handle}->execute(q{
      if object_id('tempdb..#FreeSpace') is null 
        create table #FreeSpace(  
          Drive varchar(10),  
          MB_Free bigint  
        ) 
    });
    $self->{handle}->execute(q{
      DELETE FROM #FreeSpace
    });
    $self->{handle}->execute(q{
      INSERT INTO #FreeSpace exec master.dbo.xp_fixeddrives
    });
    foreach($self->{handle}->fetchall_array(q{
      SELECT * FROM #FreeSpace
    })) {
      $calc->{drive_mb}->{lc $_->[0]} = $_->[1];
    }
    #$self->{handle}->execute(q{
    #  DROP TABLE #FreeSpace
    #});
    # Page = 8KB
    # sysfiles ist sv2000, noch als kompatibilitaetsview vorhanden
    # dbo.sysfiles kann 2008 durch sys.database_files ersetzt werden?
    # omeiomeiomei in 2005 ist ein sys.sysindexes compatibility view
    #   fuer 2000.dbo.sysindexes
    #   besser ist sys.allocation_units
    if (DBD::MSSQL::Server::return_first_server()->version_is_minimum("9.x")) {
      my $sql = q{
          SELECT 
              SUM(CAST(used AS BIGINT)) / 128
          FROM 
              [?].sys.sysindexes
          WHERE
              indid IN (0,1,255)
      };
      #$sql =~ s/\[\?\]/$self->{name}/g;
      $sql =~ s/\?/$self->{name}/g;
      $self->{used_mb} = $self->{handle}->fetchrow_array($sql);
    } else {
      my $sql = q{
          SELECT 
              SUM(CAST(used AS BIGINT)) / 128
          FROM 
              [?].dbo.sysindexes
          WHERE
              indid IN (0,1,255)
      };
      #$sql =~ s/\[\?\]/$self->{name}/g;
      $sql =~ s/\?/$self->{name}/g;
      $self->{used_mb} = $self->{handle}->fetchrow_array($sql);
    }
    my @fileresult = ();
    if (DBD::MSSQL::Server::return_first_server()->version_is_minimum("9.x")) {
      my $sql = q{
          SELECT
              RTRIM(a.name), RTRIM(a.filename), CAST(a.size AS BIGINT),
              CAST(a.maxsize AS BIGINT), a.growth
          FROM
              [?].sys.sysfiles a
          JOIN
              [?].sys.sysfilegroups b
          ON
              a.groupid = b.groupid
      };
      #$sql =~ s/\[\?\]/$self->{name}/g;
      $sql =~ s/\?/$self->{name}/g;
      @fileresult = $self->{handle}->fetchall_array($sql);
    } else {
      my $sql = q{
          SELECT
              RTRIM(a.name), RTRIM(a.filename), CAST(a.size AS BIGINT),
              CAST(a.maxsize AS BIGINT), a.growth
          FROM
              [?].dbo.sysfiles a
          JOIN
              [?].dbo.sysfilegroups b
          ON
              a.groupid = b.groupid
      };
      #$sql =~ s/\[\?\]/$self->{name}/g;
      $sql =~ s/\?/$self->{name}/g;
      @fileresult = $self->{handle}->fetchall_array($sql);
    }
    foreach(@fileresult) {
      my($name, $filename, $size, $maxsize, $growth) = @{$_};
      my $drive = lc substr($filename, 0, 1);
      $calc->{datafile}->{$name}->{allocsize} = $size / 128;
      if ($growth == 0) {
        $calc->{datafile}->{$name}->{maxsize} = $size / 128;
      } else {
        if ($maxsize == -1) {
          $calc->{datafile}->{$name}->{maxsize} =
              exists $calc->{drive_mb}->{$drive} ?
                  ($calc->{datafile}->{$name}->{allocsize} + 
                   $calc->{drive_mb}->{$drive}) : 4 * 1024;
          # falls die platte nicht gefunden wurde, dann nimm halt 4GB
        } else {
          $calc->{datafile}->{$name}->{maxsize} = $maxsize / 128;
        }
      }
      $self->{allocated_mb} += $calc->{datafile}->{$name}->{allocsize};
      $self->{max_mb} += $calc->{datafile}->{$name}->{maxsize};
    }
    $self->{allocated_mb} = $self->{allocated_mb};
    if ($self->{used_mb} > $self->{allocated_mb}) {
      # obige used-berechnung liefert manchmal (wenns knapp hergeht) mehr als
      # den maximal verfuegbaren platz. vermutlich muessen dann
      # zwecks ermittlung des tatsaechlichen platzverbrauchs 
      # irgendwelche dbcc updateusage laufen.
      # egal, wird schon irgendwie stimmen.
      $self->{used_mb} = $self->{allocated_mb};
      $self->{estimated} = 1;
    } else {
      $self->{estimated} = 0;
    }
    $self->{free_mb} = $self->{max_mb} - $self->{used_mb};
    $self->{free_percent} = 100 * $self->{free_mb} / $self->{max_mb};
    $self->{allocated_percent} = 100 * $self->{allocated_mb} / $self->{max_mb};
  } elsif ($params{mode} =~ /^server::database::transactions/) {
    $self->{transactions_s} = $self->{handle}->get_perf_counter_instance(
        'SQLServer:Databases', 'Transactions/sec', $self->{name});
    if (! defined $self->{transactions_s}) {
      $self->add_nagios_unknown("unable to aquire counter data for $self->{name}");
    } else {
      $self->valdiff(\%params, qw(transactions_s));
      $self->{transactions_per_sec} = $self->{delta_transactions_s} / $self->{delta_timestamp};
    }
  }
}

sub nagios {
  my $self = shift;
  my %params = @_;
  if (! $self->{nagios_level}) {
    if ($params{mode} =~ /server::database::datafile::listdatafiles/) {
      foreach (sort { $a->{logicalfilename} cmp $b->{logicalfilename}; }  @{$self->{datafiles}}) {
	printf "%s\n", $_->{logicalfilename};
      }
      $self->add_nagios_ok("have fun");
    } elsif ($params{mode} =~ /^server::database::transactions/) {
      $self->add_nagios(
          $self->check_thresholds($self->{transactions_per_sec}, 10000, 50000),
          sprintf "\n%s has %.4f transactions / sec",
          $self->{name}, $self->{transactions_per_sec});
      $self->add_perfdata(sprintf "%s_transactions_per_sec=%.4f;%s;%s",
          $self->{name}, $self->{transactions_per_sec},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /server::database::databasefree/) {
      # ->percent_free
      # ->free
      #
      # ausgabe
      #   perfdata db_<db>_free_pct
      #   perfdata db_<db>_free        (real_bytes_max - bytes) + bytes_free  (with units)
      #   perfdata db_<db>_alloc_free  bytes_free (with units)
      #
              # umrechnen der thresholds
      # ()/%
      # MB
      # GB
      # KB
      if (($self->{warningrange} && $self->{warningrange} !~ /^\d+[\.\d]*:/) ||
          ($self->{criticalrange} && $self->{criticalrange} !~ /^\d+[\.\d]*:/)) {
        $self->add_nagios_unknown("you want an alert if free space is _above_ a threshold????");
        return;
      }
      if (! $params{units}) {
        $params{units} = "%";
      }
      $self->{warning_bytes} = 0;
      $self->{critical_bytes} = 0;
      if ($params{units} eq "%") {
        $self->add_nagios(
            $self->check_thresholds($self->{free_percent}, "5:", "2:"),
                sprintf("database %s has %.2f%% free space left",
                $self->{name}, $self->{free_percent},
                ($self->{estimated} ? " (estim.)" : ""))
        );
        $self->{warningrange} =~ s/://g;
        $self->{criticalrange} =~ s/://g;
        $self->add_perfdata(sprintf "\'db_%s_free_pct\'=%.2f%%;%d:;%d:",
            lc $self->{name},
            $self->{free_percent},
            $self->{warningrange}, $self->{criticalrange});
        $self->add_perfdata(sprintf "\'db_%s_free\'=%dMB;%.2f:;%.2f:;0;%.2f",
            lc $self->{name},
            $self->{free_mb},
            $self->{warningrange} * $self->{max_mb} / 100,
            $self->{criticalrange} * $self->{max_mb} / 100,
            $self->{max_mb});
        $self->add_perfdata(sprintf "\'db_%s_allocated_pct\'=%.2f%%",
            lc $self->{name},
            $self->{allocated_percent});
      } else {
        my $factor = 1; # default MB
        if ($params{units} eq "GB") {
          $factor = 1024;
        } elsif ($params{units} eq "MB") {
          $factor = 1;
        } elsif ($params{units} eq "KB") {
          $factor = 1 / 1024;
        }
        $self->{warningrange} ||= "5:";
        $self->{criticalrange} ||= "2:";
        my $saved_warningrange = $self->{warningrange};
        my $saved_criticalrange = $self->{criticalrange};
        # : entfernen weil gerechnet werden muss
        $self->{warningrange} =~ s/://g;
        $self->{criticalrange} =~ s/://g;
        $self->{warningrange} = $self->{warningrange} ?
            $self->{warningrange} * $factor : 5 * $factor;
        $self->{criticalrange} = $self->{criticalrange} ?
            $self->{criticalrange} * $factor : 2 * $factor;
        $self->{percent_warning} = 100 * $self->{warningrange} / $self->{max_mb};
        $self->{percent_critical} = 100 * $self->{criticalrange} / $self->{max_mb};
        $self->{warningrange} .= ':';
        $self->{criticalrange} .= ':';
        $self->add_nagios(
            $self->check_thresholds($self->{free_mb}, "5242880:", "1048576:"),
                sprintf("database %s has %.2f%s free space left", $self->{name},
                    $self->{free_mb} / $factor, $params{units})
        );
        $self->{warningrange} = $saved_warningrange;
        $self->{criticalrange} = $saved_criticalrange;
        $self->{warningrange} =~ s/://g;
        $self->{criticalrange} =~ s/://g;
        $self->add_perfdata(sprintf "\'db_%s_free_pct\'=%.2f%%;%.2f:;%.2f:",
            lc $self->{name},
            $self->{free_percent}, $self->{percent_warning},
            $self->{percent_critical});
        $self->add_perfdata(sprintf "\'db_%s_free\'=%.2f%s;%.2f:;%.2f:;0;%.2f",
            lc $self->{name},
            $self->{free_mb} / $factor, $params{units},
            $self->{warningrange},
            $self->{criticalrange},
            $self->{max_mb} / $factor);
        $self->add_perfdata(sprintf "\'db_%s_allocated_pct\'=%.2f%%",
            lc $self->{name},
            $self->{allocated_percent});
      }
    } elsif ($params{mode} =~ /server::database::backupage/) {
      if (! defined $self->{backup_age}) { 
        $self->add_nagios_critical(sprintf "%s was never backupped",
            $self->{name}); 
        $self->{backup_age} = 0;
        $self->{backup_duration} = 0;
        $self->check_thresholds($self->{backup_age}, 48, 72); # init wg perfdata
      } else { 
        $self->add_nagios( 
            $self->check_thresholds($self->{backup_age}, 48, 72), 
            sprintf "\n%s backupped %dh ago", $self->{name}, $self->{backup_age});
      } 
      $self->add_perfdata(sprintf "'%s_bck_age'=%d;%s;%s", 
          $self->{name}, $self->{backup_age}, 
          $self->{warningrange}, $self->{criticalrange}); 
      $self->add_perfdata(sprintf "'%s_bck_time'=%d", 
          $self->{name}, $self->{backup_duration}); 
    } 
  }
}



package DBD::MSSQL::Server;

use strict;
use Time::HiRes;
use IO::File;
use File::Copy 'cp';
use Data::Dumper;


{
  our $verbose = 0;
  our $scream = 0; # scream if something is not implemented
  our $my_modules_dyn_dir = ""; # where we look for self-written extensions

  my @servers = ();
  my $initerrors = undef;

  sub add_server {
    push(@servers, shift);
  }

  sub return_servers {
    return @servers;
  }
  
  sub return_first_server() {
    return $servers[0];
  }

}

sub new {
  my $class = shift;
  my %params = @_;
  my $self = {
    method => $params{method} || "dbi",
    hostname => $params{hostname},
    username => $params{username},
    password => $params{password},
    port => $params{port} || 1433,
    server => $params{server},
    timeout => $params{timeout},
    warningrange => $params{warningrange},
    criticalrange => $params{criticalrange},
    version => 'unknown',
    os => 'unknown',
    servicename => 'unknown',
    instance => undef,
    memorypool => undef,
    databases => [],
    handle => undef,
  };
  bless $self, $class;
  $self->init_nagios();
  if ($self->dbconnect(%params)) {
    #$self->{version} = $self->{handle}->fetchrow_array(
    #    q{ SELECT SERVERPROPERTY('productversion') });
    map {
        $self->{os} = $1 if /Windows (.*)/; 
        $self->{version} = $1 if /SQL Server.*\-\s*([\d\.]+)/;
    } $self->{handle}->fetchrow_array(
        q{ SELECT @@VERSION });
    $self->{dbuser} = $self->{handle}->fetchrow_array(
        q{ SELECT SYSTEM_USER });  # maybe SELECT SUSER_SNAME()
    $self->{servicename} = $self->{handle}->fetchrow_array(
        q{ SELECT @@SERVICENAME });  
    if (lc $self->{servicename} ne 'mssqlserver') {
      # braucht man fuer abfragen von dm_os_performance_counters
      # object_name ist entweder "SQLServer:Buffer Node" oder z.b. "MSSQL$OASH: Buffer Node"
      $self->{servicename} = 'MSSQL$'.$self->{servicename};
    } else {
      $self->{servicename} = 'SQLServer';
    }
    DBD::MSSQL::Server::add_server($self);
    $self->init(%params);
  }
  return $self;
}

sub init {
  my $self = shift;
  my %params = @_;
  $params{handle} = $self->{handle};
  if ($params{mode} =~ /^server::memorypool/) {
    $self->{memorypool} = DBD::MSSQL::Server::Memorypool->new(%params);
  } elsif ($params{mode} =~ /^server::database/) {
    DBD::MSSQL::Server::Database::init_databases(%params);
    if (my @databases =
        DBD::MSSQL::Server::Database::return_databases()) {
      $self->{databases} = \@databases;
    } else {
      $self->add_nagios_critical("unable to aquire database info");
    }
  } elsif ($params{mode} =~ /^server::connectiontime/) {
    $self->{connection_time} = $self->{tac} - $self->{tic};
  } elsif ($params{mode} =~ /^server::cpubusy/) {
    if (DBD::MSSQL::Server::return_first_server()->version_is_minimum("9.x")) {
      ($self->{secs_busy}) = $self->{handle}->fetchrow_array(q{
          SELECT ((@@CPU_BUSY * CAST(@@TIMETICKS AS FLOAT)) /
              (SELECT (CAST(CPU_COUNT AS FLOAT) / CAST(HYPERTHREAD_RATIO AS FLOAT)) FROM sys.dm_os_sys_info) /
              1000000)
      });
      $self->valdiff(\%params, qw(secs_busy));
      if (defined $self->{secs_busy}) {
        $self->{cpu_busy} = 100 *
            $self->{delta_secs_busy} / $self->{delta_timestamp};
      } else {
        $self->add_nagios_critical("got no cputime from dm_os_sys_info");
      }
    } else {
      #$self->requires_version('9');
      my @monitor = $params{handle}->exec_sp_1hash(q{exec sp_monitor});
      foreach (@monitor) {
        if ($_->[0] eq 'cpu_busy') {
          if ($_->[1] =~ /(\d+)%/) {
            $self->{cpu_busy} = $1;
          }
        }
      }
      self->requires_version('9') unless defined $self->{cpu_busy};
    }
  } elsif ($params{mode} =~ /^server::iobusy/) {
    if (DBD::MSSQL::Server::return_first_server()->version_is_minimum("9.x")) {
      ($self->{secs_busy}) = $self->{handle}->fetchrow_array(q{
          SELECT ((@@IO_BUSY * CAST(@@TIMETICKS AS FLOAT)) /
              (SELECT (CAST(CPU_COUNT AS FLOAT) / CAST(HYPERTHREAD_RATIO AS FLOAT)) FROM sys.dm_os_sys_info) /
              1000000)
      });
      $self->valdiff(\%params, qw(secs_busy));
      if (defined $self->{secs_busy}) {
        $self->{io_busy} = 100 *
            $self->{delta_secs_busy} / $self->{delta_timestamp};
      } else {
        $self->add_nagios_critical("got no iotime from dm_os_sys_info");
      }
    } else {
      #$self->requires_version('9');
      my @monitor = $params{handle}->exec_sp_1hash(q{exec sp_monitor});
      foreach (@monitor) {
        if ($_->[0] eq 'io_busy') {
          if ($_->[1] =~ /(\d+)%/) {
            $self->{io_busy} = $1;
          }
        }
      }
      self->requires_version('9') unless defined $self->{io_busy};
    }
  } elsif ($params{mode} =~ /^server::fullscans/) {
    $self->{cnt_full_scans_s} = $self->{handle}->get_perf_counter(
        'SQLServer:Access Methods', 'Full Scans/sec');
    if (! defined $self->{cnt_full_scans_s}) {
      $self->add_nagios_unknown("unable to aquire counter data");
    } else {
      $self->valdiff(\%params, qw(cnt_full_scans_s));
      $self->{full_scans_per_sec} = $self->{delta_cnt_full_scans_s} / $self->{delta_timestamp};
    }
  } elsif ($params{mode} =~ /^server::latch::waittime/) {
    $self->{latch_wait_time} = $self->{handle}->get_perf_counter(
        "SQLServer:Latches", "Average Latch Wait Time (ms)");
    $self->{latch_wait_time_base} = $self->{handle}->get_perf_counter(
        "SQLServer:Latches", "Average Latch Wait Time Base");
    if (! defined $self->{latch_wait_time}) {
      $self->add_nagios_unknown("unable to aquire counter data");
    }
    $self->{latch_wait_time} = $self->{latch_wait_time} / $self->{latch_wait_time_base};
  } elsif ($params{mode} =~ /^server::latch::waits/) {
    $self->{latch_waits_s} = $self->{handle}->get_perf_counter(
        "SQLServer:Latches", "Latch Waits/sec");
    if (! defined $self->{latch_waits_s}) {
      $self->add_nagios_unknown("unable to aquire counter data");
    } else {
      $self->valdiff(\%params, qw(latch_waits_s));
      $self->{latch_waits_per_sec} = $self->{delta_latch_waits_s} / $self->{delta_timestamp};
    }
  } elsif ($params{mode} =~ /^server::sql::.*compilations/) {
    $self->{recompilations_s} = $self->{handle}->get_perf_counter(
        "SQLServer:SQL Statistics", "SQL Re-Compilations/sec");
    $self->{compilations_s} = $self->{handle}->get_perf_counter(
        "SQLServer:SQL Statistics", "SQL Compilations/sec");
    if (! defined $self->{recompilations_s}) {
      $self->add_nagios_unknown("unable to aquire counter data");
    } else {
      $self->valdiff(\%params, qw(recompilations_s compilations_s));
      # http://www.sqlmag.com/Articles/ArticleID/40925/pg/3/3.html
      # http://www.grumpyolddba.co.uk/monitoring/Performance%20Counter%20Guidance%20-%20SQL%20Server.htm
      $self->{delta_initial_compilations_s} = $self->{delta_compilations_s} - 
          $self->{delta_recompilations_s};
      $self->{initial_compilations_per_sec} = 
          $self->{delta_initial_compilations_s} / $self->{delta_timestamp};
      $self->{recompilations_per_sec} = 
          $self->{delta_recompilations_s} / $self->{delta_timestamp};
    }
  } elsif ($params{mode} =~ /^server::batchrequests/) {
    $self->{batch_requests_s} = $self->{handle}->get_perf_counter(
        "SQLServer:SQL Statistics", "Batch requests/sec");
    if (! defined $self->{batch_requests_s}) {
      $self->add_nagios_unknown("unable to aquire counter data");
    } else {
      $self->valdiff(\%params, qw(batch_requests_s));
      $self->{batch_requests_per_sec} = $self->{delta_batch_requests_s} / $self->{delta_timestamp};
    }
  } elsif ($params{mode} =~ /^server::totalmemory/) {
    $self->{total_memory} = $self->{handle}->get_perf_counter(
        "SQLServer:Memory Manager", "Total Server Memory (KB)");
    if (! defined $self->{total_memory}) {
      $self->add_nagios_unknown("unable to aquire counter data");
    }
  } elsif ($params{mode} =~ /^server::connectedusers/) {
    $self->{connectedusers} = $self->{handle}->fetchrow_array(q{
      SELECT
          COUNT(*)
      FROM
          master..sysprocesses
      WHERE
          spid > ?
    }, 51);
    if (! defined $self->{connectedusers}) {
      $self->add_nagios_unknown("unable to count connected users");
    }
  } elsif ($params{mode} =~ /^server::sql/) {
    @{$self->{genericsql}} =
        $self->{handle}->fetchrow_array($params{selectname});
    if ((scalar(@{$self->{genericsql}}) == 0) ||
        (! (defined $self->{genericsql} &&
        (scalar(grep { /^\s*\d+\.{0,1}\d*\s*$/ } @{$self->{genericsql}})) ==
        scalar(@{$self->{genericsql}})))) {
      $self->add_nagios_unknown(sprintf "got no valid response for %s",
          $params{selectname});
    } else {
      # name2 in array
      # units in array
    }
  } elsif ($params{mode} =~ /^my::([^:.]+)/) {
    my $class = $1;
    my $loaderror = undef;
    substr($class, 0, 1) = uc substr($class, 0, 1);
    foreach my $libpath (split(":", $DBD::MSSQL::Server::my_modules_dyn_dir)) {
      foreach my $extmod (glob $libpath."/CheckMSSQLHealth*.pm") {
        eval {
          $self->trace(sprintf "loading module %s", $extmod);
          require $extmod;
        };
        if ($@) {
          $loaderror = $extmod;
          $self->trace(sprintf "failed loading module %s: %s", $extmod, $@);
        }
      }
    }
    my $obj = {
        handle => $params{handle},
        warningrange => $params{warningrange},
        criticalrange => $params{criticalrange},
    };
    bless $obj, "My$class";
    $self->{my} = $obj;
    if ($self->{my}->isa("DBD::MSSQL::Server")) {
      my $dos_init = $self->can("init");
      my $dos_nagios = $self->can("nagios");
      my $my_init = $self->{my}->can("init");
      my $my_nagios = $self->{my}->can("nagios");
      if ($my_init == $dos_init) {
          $self->add_nagios_unknown(
              sprintf "Class %s needs an init() method", ref($self->{my}));
      } elsif ($my_nagios == $dos_nagios) {
          $self->add_nagios_unknown(
              sprintf "Class %s needs a nagios() method", ref($self->{my}));
      } else {
        $self->{my}->init_nagios(%params);
        $self->{my}->init(%params);
      }
    } else {
      $self->add_nagios_unknown(
          sprintf "Class %s is not a subclass of DBD::MSSQL::Server%s", 
              ref($self->{my}),
              $loaderror ? sprintf " (syntax error in %s?)", $loaderror : "" );
    }
  } else {
    printf "broken mode %s\n", $params{mode};
  }
}

sub dump {
  my $self = shift;
  my $message = shift || "";
  printf "%s %s\n", $message, Data::Dumper::Dumper($self);
}

sub nagios {
  my $self = shift;
  my %params = @_;
  if (! $self->{nagios_level}) {
    if ($params{mode} =~ /^server::instance/) {
      $self->{instance}->nagios(%params);
      $self->merge_nagios($self->{instance});
    } elsif ($params{mode} =~ /server::database::listdatabases/) {
      foreach (sort { $a->{name} cmp $b->{name}; }  @{$self->{databases}}) {
        printf "%s\n", $_->{name};
      }
      $self->add_nagios_ok("have fun");
    } elsif ($params{mode} =~ /^server::database/) {
      foreach (@{$self->{databases}}) {
        $_->nagios(%params);
        $self->merge_nagios($_);
      }
    } elsif ($params{mode} =~ /^server::database/) {
    } elsif ($params{mode} =~ /^server::lock/) {
      foreach (@{$self->{locks}}) {
        $_->nagios(%params);
        $self->merge_nagios($_);
      }
    } elsif ($params{mode} =~ /^server::memorypool/) {
      $self->{memorypool}->nagios(%params);
      $self->merge_nagios($self->{memorypool});
    } elsif ($params{mode} =~ /^server::connectiontime/) {
      $self->add_nagios(
          $self->check_thresholds($self->{connection_time}, 1, 5),
          sprintf "%.2f seconds to connect as %s",
              $self->{connection_time}, $self->{dbuser});
      $self->add_perfdata(sprintf "connection_time=%.2f;%d;%d",
          $self->{connection_time},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /^server::cpubusy/) {
      $self->add_nagios(
          $self->check_thresholds($self->{cpu_busy}, 80, 90),
          sprintf "CPU busy %.2f%%", $self->{cpu_busy});
      $self->add_perfdata(sprintf "cpu_busy=%.2f;%s;%s",
          $self->{cpu_busy},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /^server::iobusy/) {
      $self->add_nagios(
          $self->check_thresholds($self->{io_busy}, 80, 90),
          sprintf "IO busy %.2f%%", $self->{io_busy});
      $self->add_perfdata(sprintf "io_busy=%.2f;%s;%s",
          $self->{io_busy},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /^server::fullscans/) {
      $self->add_nagios(
          $self->check_thresholds($self->{full_scans_per_sec}, 100, 500),
          sprintf "%.2f full table scans / sec", $self->{full_scans_per_sec});
      $self->add_perfdata(sprintf "full_scans_per_sec=%.2f;%s;%s",
          $self->{full_scans_per_sec},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /^server::latch::waits/) {
      $self->add_nagios(
          $self->check_thresholds($self->{latch_waits_per_sec}, 10, 50),
          sprintf "%.2f latches / sec have to wait", $self->{latch_waits_per_sec});
      $self->add_perfdata(sprintf "latch_waits_per_sec=%.2f;%s;%s",
          $self->{latch_waits_per_sec},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /^server::latch::waittime/) {
      $self->add_nagios(
          $self->check_thresholds($self->{latch_wait_time}, 1, 5),
          sprintf "latches have to wait %.2f ms avg", $self->{latch_wait_time});
      $self->add_perfdata(sprintf "latch_avg_wait_time=%.2fms;%s;%s",
          $self->{latch_wait_time},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /^server::sql::recompilations/) {
      $self->add_nagios(
          $self->check_thresholds($self->{recompilations_per_sec}, 1, 10),
          sprintf "%.2f SQL recompilations / sec", $self->{recompilations_per_sec});
      $self->add_perfdata(sprintf "sql_recompilations_per_sec=%.2f;%s;%s",
          $self->{recompilations_per_sec},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /^server::sql::initcompilations/) {
      $self->add_nagios(
          $self->check_thresholds($self->{initial_compilations_per_sec}, 100, 200),
          sprintf "%.2f initial compilations / sec", $self->{initial_compilations_per_sec});
      $self->add_perfdata(sprintf "sql_initcompilations_per_sec=%.2f;%s;%s",
          $self->{initial_compilations_per_sec},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /^server::batchrequests/) {
      $self->add_nagios(
          $self->check_thresholds($self->{batch_requests_per_sec}, 100, 200),
          sprintf "%.2f batch requests / sec", $self->{batch_requests_per_sec});
      $self->add_perfdata(sprintf "batch_requests_per_sec=%.2f;%s;%s",
          $self->{batch_requests_per_sec},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /^server::totalmemory/) {
      $self->add_nagios(
          $self->check_thresholds($self->{total_memory}, 1000, 5000),
          sprintf "total server memory %ld", $self->{total_memory});
      $self->add_perfdata(sprintf "total_server_memory=%ld;%s;%s",
          $self->{total_memory},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /^server::connectedusers/) {
      $self->add_nagios(
          $self->check_thresholds($self->{connectedusers}, 50, 80),
          sprintf "%d connected users", $self->{connectedusers});
      $self->add_perfdata(sprintf "connected_users=%d;%s;%s",
          $self->{connectedusers},
          $self->{warningrange}, $self->{criticalrange});
    } elsif ($params{mode} =~ /^server::sql/) {
      $self->add_nagios(
          # the first item in the list will trigger the threshold values
          $self->check_thresholds($self->{genericsql}[0], 1, 5),
              sprintf "%s: %s%s",
              $params{name2} ? lc $params{name2} : lc $params{selectname},
              # float as float, integers as integers
              join(" ", map {
                  (sprintf("%d", $_) eq $_) ? $_ : sprintf("%f", $_)
              } @{$self->{genericsql}}),
              $params{units} ? $params{units} : "");
      my $i = 0;
      # workaround... getting the column names from the database would be nicer
      my @names2_arr = split(/\s+/, $params{name2});
      foreach my $t (@{$self->{genericsql}}) {
        $self->add_perfdata(sprintf "\'%s\'=%s%s;%s;%s",
            $names2_arr[$i] ? lc $names2_arr[$i] : lc $params{selectname},
            # float as float, integers as integers
            (sprintf("%d", $t) eq $t) ? $t : sprintf("%f", $t),
            $params{units} ? $params{units} : "",
	    ($i == 0) ? $self->{warningrange} : "",
            ($i == 0) ? $self->{criticalrange} : ""
        );
        $i++;
      }
    } elsif ($params{mode} =~ /^my::([^:.]+)/) {
      $self->{my}->nagios(%params);
      $self->merge_nagios($self->{my});
    }
  }
}


sub init_nagios {
  my $self = shift;
  no strict 'refs';
  if (! ref($self)) {
    my $nagiosvar = $self."::nagios";
    my $nagioslevelvar = $self."::nagios_level";
    $$nagiosvar = {
      messages => {
        0 => [],
        1 => [],
        2 => [],
        3 => [],
      },
      perfdata => [],
    };
    $$nagioslevelvar = $ERRORS{OK},
  } else {
    $self->{nagios} = {
      messages => {
        0 => [],
        1 => [],
        2 => [],
        3 => [],
      },
      perfdata => [],
    };
    $self->{nagios_level} = $ERRORS{OK},
  }
}

sub check_thresholds {
  my $self = shift;
  my $value = shift;
  my $defaultwarningrange = shift;
  my $defaultcriticalrange = shift;
  my $level = $ERRORS{OK};
  $self->{warningrange} = defined $self->{warningrange} ?
      $self->{warningrange} : $defaultwarningrange;
  $self->{criticalrange} = defined $self->{criticalrange} ?
      $self->{criticalrange} : $defaultcriticalrange;
  if ($self->{warningrange} !~ /:/ && $self->{criticalrange} !~ /:/) {
    # warning = 10, critical = 20, warn if > 10, crit if > 20
    $level = $ERRORS{WARNING} if $value > $self->{warningrange};
    $level = $ERRORS{CRITICAL} if $value > $self->{criticalrange};
  } elsif ($self->{warningrange} =~ /(\d+):/ && 
      $self->{criticalrange} =~ /(\d+):/) {
    # warning = 98:, critical = 95:, warn if < 98, crit if < 95
    $self->{warningrange} =~ /(\d+):/;
    $level = $ERRORS{WARNING} if $value < $1;
    $self->{criticalrange} =~ /(\d+):/;
    $level = $ERRORS{CRITICAL} if $value < $1;
  }
  return $level;
  #
  # syntax error must be reported with returncode -1
  #
}

sub add_nagios {
  my $self = shift;
  my $level = shift;
  my $message = shift;
  push(@{$self->{nagios}->{messages}->{$level}}, $message);
  # recalc current level
  foreach my $llevel qw(CRITICAL WARNING UNKNOWN OK) {
    if (scalar(@{$self->{nagios}->{messages}->{$ERRORS{$llevel}}})) {
      $self->{nagios_level} = $ERRORS{$llevel};
    }
  }
}

sub add_nagios_ok {
  my $self = shift;
  my $message = shift;
  $self->add_nagios($ERRORS{OK}, $message);
}

sub add_nagios_warning {
  my $self = shift;
  my $message = shift;
  $self->add_nagios($ERRORS{WARNING}, $message);
}

sub add_nagios_critical {
  my $self = shift;
  my $message = shift;
  $self->add_nagios($ERRORS{CRITICAL}, $message);
}

sub add_nagios_unknown {
  my $self = shift;
  my $message = shift;
  $self->add_nagios($ERRORS{UNKNOWN}, $message);
}

sub add_perfdata {
  my $self = shift;
  my $data = shift;
  push(@{$self->{nagios}->{perfdata}}, $data);
}

sub merge_nagios {
  my $self = shift;
  my $child = shift;
  foreach my $level (0..3) {
    foreach (@{$child->{nagios}->{messages}->{$level}}) {
      $self->add_nagios($level, $_);
    }
    #push(@{$self->{nagios}->{messages}->{$level}},
    #    @{$child->{nagios}->{messages}->{$level}});
  }
  push(@{$self->{nagios}->{perfdata}}, @{$child->{nagios}->{perfdata}});
}


sub calculate_result {
  my $self = shift;
  if ($ENV{NRPE_MULTILINESUPPORT} && 
      length join(" ", @{$self->{nagios}->{perfdata}}) > 200) {
    foreach my $level ("CRITICAL", "WARNING", "UNKNOWN", "OK") {
      # first the bad news
      if (scalar(@{$self->{nagios}->{messages}->{$ERRORS{$level}}})) {
        $self->{nagios_message} .=
            "\n".join("\n", @{$self->{nagios}->{messages}->{$ERRORS{$level}}});
      }
    }
    $self->{nagios_message} =~ s/^\n//g;
    $self->{perfdata} = join("\n", @{$self->{nagios}->{perfdata}});
  } else {
    foreach my $level ("CRITICAL", "WARNING", "UNKNOWN", "OK") {
      # first the bad news
      if (scalar(@{$self->{nagios}->{messages}->{$ERRORS{$level}}})) {
        $self->{nagios_message} .= 
            join(", ", @{$self->{nagios}->{messages}->{$ERRORS{$level}}}).", ";
      }
    }
    $self->{nagios_message} =~ s/, $//g;
    $self->{perfdata} = join(" ", @{$self->{nagios}->{perfdata}});
  }
  foreach my $level ("OK", "UNKNOWN", "WARNING", "CRITICAL") {
    if (scalar(@{$self->{nagios}->{messages}->{$ERRORS{$level}}})) {
      $self->{nagios_level} = $ERRORS{$level};
    }
  }
}

sub debug {
  my $self = shift;
  my $msg = shift;
  if ($DBD::MSSQL::Server::verbose) {
    printf "%s %s\n", $msg, ref($self);
  }
}

sub dbconnect {
  my $self = shift;
  my %params = @_;
  my $retval = undef;
  $self->{tic} = Time::HiRes::time();
  $self->{handle} = DBD::MSSQL::Server::Connection->new(%params);
  if ($self->{handle}->{errstr}) {
    if ($self->{handle}->{errstr} eq "alarm\n") {
      $self->add_nagios($ERRORS{CRITICAL},
          sprintf "connection could not be established within %d seconds",
              $self->{timeout});
    } else {
      $self->add_nagios($ERRORS{CRITICAL},
          sprintf "cannot connect to %s. %s",
          ($self->{server} ? $self->{server} :
          ($self->{hostname} ? $self->{hostname} : "unknown host")),
          $self->{handle}->{errstr});
      $retval = undef;
    }
  } else {
    $retval = $self->{handle};
  }
  $self->{tac} = Time::HiRes::time();
  return $retval;
}

sub trace {
  my $self = shift;
  my $format = shift;
  if (! @_) {
    # falls im sql-statement % vorkommen. sonst krachts im printf
    $format =~ s/%/%%/g;
  }
  $self->{trace} = -f "/tmp/check_mssql_health.trace" ? 1 : 0;
  if ($DBD::MSSQL::Server::verbose) {
    printf("%s: ", scalar localtime);
    printf($format, @_);
  }
  if ($self->{trace}) {
    my $logfh = new IO::File;
    $logfh->autoflush(1);
    if ($logfh->open("/tmp/check_mssql_health.trace", "a")) {
      $logfh->printf("%s: ", scalar localtime);
      $logfh->printf($format, @_);
      $logfh->printf("\n");
      $logfh->close();
    }
  }
}

sub DESTROY {
  my $self = shift;
  my $handle1 = "null";
  my $handle2 = "null";
  if (defined $self->{handle}) {
    $handle1 = ref($self->{handle});
    if (defined $self->{handle}->{handle}) {
      $handle2 = ref($self->{handle}->{handle});
    }
  }
  $self->trace(sprintf "DESTROY %s with handle %s %s", ref($self), $handle1, $handle2);
  if (ref($self) eq "DBD::MSSQL::Server") {
  }
  $self->trace(sprintf "DESTROY %s exit with handle %s %s", ref($self), $handle1, $handle2);
  if (ref($self) eq "DBD::MSSQL::Server") {
    #printf "humpftata\n";
  }
}

sub save_state {
  my $self = shift;
  my %params = @_;
  my $extension = "";
  mkdir $params{statefilesdir} unless -d $params{statefilesdir};
  my $statefile = sprintf "%s/%s_%s", 
      $params{statefilesdir}, ($params{hostname} || $params{server}), $params{mode};
  $extension .= $params{differenciator} ? "_".$params{differenciator} : "";
  $extension .= $params{port} ? "_".$params{port} : "";
  $extension .= $params{database} ? "_".$params{database} : "";
  $extension .= $params{name} ? "_".$params{name} : "";
  $extension =~ s/\//_/g;
  $extension =~ s/\(/_/g;
  $extension =~ s/\)/_/g;
  $extension =~ s/\*/_/g;
  $extension =~ s/\s/_/g;
  $statefile .= $extension;
  $statefile = lc $statefile;
  open(STATE, ">$statefile");
  if ((ref($params{save}) eq "HASH") && exists $params{save}->{timestamp}) {
    $params{save}->{localtime} = scalar localtime $params{save}->{timestamp};
  }
  printf STATE Data::Dumper::Dumper($params{save});
  close STATE;
  $self->debug(sprintf "saved %s to %s",
      Data::Dumper::Dumper($params{save}), $statefile);
}

sub load_state {
  my $self = shift;
  my %params = @_;
  my $extension = "";
  my $statefile = sprintf "%s/%s_%s", 
      $params{statefilesdir}, ($params{hostname} || $params{server}), $params{mode};
  $extension .= $params{differenciator} ? "_".$params{differenciator} : "";
  $extension .= $params{port} ? "_".$params{port} : "";
  $extension .= $params{database} ? "_".$params{database} : "";
  $extension .= $params{name} ? "_".$params{name} : "";
  $extension =~ s/\//_/g;
  $extension =~ s/\(/_/g;
  $extension =~ s/\)/_/g;
  $extension =~ s/\*/_/g;
  $extension =~ s/\s/_/g;
  $statefile .= $extension;
  $statefile = lc $statefile;
  if ( -f $statefile) {
    our $VAR1;
    eval {
      require $statefile;
    };
    if($@) {
printf "rumms\n";
    }
    $self->debug(sprintf "load %s", Data::Dumper::Dumper($VAR1));
    return $VAR1;
  } else {
    return undef;
  }
}

sub valdiff {
  my $self = shift;
  my $pparams = shift;
  my %params = %{$pparams};
  my @keys = @_;
  my $last_values = $self->load_state(%params) || eval {
    my $empty_events = {};
    foreach (@keys) {
      $empty_events->{$_} = 0;
    }
    $empty_events->{timestamp} = 0;
    $empty_events;
  };
  foreach (@keys) {
    $last_values->{$_} = 0 if ! exists $last_values->{$_};
    if ($self->{$_} >= $last_values->{$_}) {
      $self->{'delta_'.$_} = $self->{$_} - $last_values->{$_};
    } else {
      # vermutlich db restart und zaehler alle auf null
      $self->{'delta_'.$_} = $self->{$_};
    }
    $self->debug(sprintf "delta_%s %f", $_, $self->{'delta_'.$_});
  }
  $self->{'delta_timestamp'} = time - $last_values->{timestamp};
  $params{save} = eval {
    my $empty_events = {};
    foreach (@keys) {
      $empty_events->{$_} = $self->{$_};
    }
    $empty_events->{timestamp} = time;
    $empty_events;
  };
  $self->save_state(%params);
}

sub requires_version {
  my $self = shift;
  my $version = shift;
  my @instances = DBD::MSSQL::Server::return_servers();
  my $instversion = $instances[0]->{version};
  if (! $self->version_is_minimum($version)) {
    $self->add_nagios($ERRORS{UNKNOWN}, 
        sprintf "not implemented/possible for MSSQL release %s", $instversion);
  }
}

sub version_is_minimum {
  # the current version is newer or equal
  my $self = shift;
  my $version = shift;
  my $newer = 1;
  my @instances = DBD::MSSQL::Server::return_servers();
  my @v1 = map { $_ eq "x" ? 0 : $_ } split(/\./, $version);
  my @v2 = split(/\./, $instances[0]->{version});
  if (scalar(@v1) > scalar(@v2)) {
    push(@v2, (0) x (scalar(@v1) - scalar(@v2)));
  } elsif (scalar(@v2) > scalar(@v1)) {
    push(@v1, (0) x (scalar(@v2) - scalar(@v1)));
  }
  foreach my $pos (0..$#v1) {
    if ($v2[$pos] > $v1[$pos]) {
      $newer = 1;
      last;
    } elsif ($v2[$pos] < $v1[$pos]) {
      $newer = 0;
      last;
    }
  }
  #printf STDERR "check if %s os minimum %s\n", join(".", @v2), join(".", @v1);
  return $newer;
}

sub instance_rac {
  my $self = shift;
  my @instances = DBD::MSSQL::Server::return_servers();
  return (lc $instances[0]->{parallel} eq "yes") ? 1 : 0;
}

sub instance_thread {
  my $self = shift;
  my @instances = DBD::MSSQL::Server::return_servers();
  return $instances[0]->{thread};
}

sub windows_server {
  my $self = shift;
  my @instances = DBD::MSSQL::Server::return_servers();
  if ($instances[0]->{os} =~ /Win/i) {
    return 1;
  } else {
    return 0;
  }
}

sub system_vartmpdir {
  my $self = shift;
  if ($^O =~ /MSWin/) {
    return $self->system_tmpdir();
  } else {
    return "/var/tmp/check_mssql_health";
  }
}

sub system_oldvartmpdir {
  my $self = shift;
  return "/tmp";
}

sub system_tmpdir {
  my $self = shift;
  if ($^O =~ /MSWin/) {
    return $ENV{TEMP} if defined $ENV{TEMP};
    return $ENV{TMP} if defined $ENV{TMP};
    return File::Spec->catfile($ENV{windir}, 'Temp')
        if defined $ENV{windir};
    return 'C:\Temp';
  } else {
    return "/tmp";
  }
}


package DBD::MSSQL::Server::Connection;

use strict;

our @ISA = qw(DBD::MSSQL::Server);


sub new {
  my $class = shift;
  my %params = @_;
  my $self = {
    mode => $params{mode},
    timeout => $params{timeout},
    method => $params{method} || "dbi",
    hostname => $params{hostname},
    username => $params{username},
    password => $params{password},
    port => $params{port} || 1433,
    server => $params{server},
    handle => undef,
  };
  bless $self, $class;
  if ($params{method} eq "dbi") {
    bless $self, "DBD::MSSQL::Server::Connection::Dbi";
  } elsif ($params{method} eq "tsql") {
    bless $self, "DBD::MSSQL::Server::Connection::Tsql";
  } elsif ($params{method} eq "sqlrelay") {
    bless $self, "DBD::MSSQL::Server::Connection::Sqlrelay";
  }
  $self->init(%params);
  return $self;
}

sub get_instance_names {
  my $self = shift;
  my $object_name = shift;
  my $servicename = DBD::MSSQL::Server::return_first_server()->{servicename};
  if ($object_name =~ /SQLServer:(.*)/) {
    $object_name = $servicename.':'.$1;
  }
  if (DBD::MSSQL::Server::return_first_server()->version_is_minimum("9.x")) {
    return $self->fetchall_array(q{
        SELECT
            DISTINCT instance_name
        FROM
            sys.dm_os_performance_counters
        WHERE
            object_name = ?
    }, $object_name);
  } else {
    return $self->fetchall_array(q{
        SELECT
            DISTINCT instance_name
        FROM
            master.dbo.sysperfinfo
        WHERE
            object_name = ?
    }, $object_name);
  }
}

sub get_perf_counter {
  my $self = shift;
  my $object_name = shift;
  my $counter_name = shift;
  my $servicename = DBD::MSSQL::Server::return_first_server()->{servicename};
  if ($object_name =~ /SQLServer:(.*)/) {
    $object_name = $servicename.':'.$1;
  }
  if (DBD::MSSQL::Server::return_first_server()->version_is_minimum("9.x")) {
    return $self->fetchrow_array(q{
        SELECT
            cntr_value
        FROM
            sys.dm_os_performance_counters
        WHERE
            counter_name = ? AND
            object_name = ?
    }, $counter_name, $object_name);
  } else {
    return $self->fetchrow_array(q{
        SELECT
            cntr_value
        FROM
            master.dbo.sysperfinfo
        WHERE
            counter_name = ? AND
            object_name = ?
    }, $counter_name, $object_name);
  }
}

sub get_perf_counter_instance {
  my $self = shift;
  my $object_name = shift;
  my $counter_name = shift;
  my $instance_name = shift;
  my $servicename = DBD::MSSQL::Server::return_first_server()->{servicename};
  if ($object_name =~ /SQLServer:(.*)/) {
    $object_name = $servicename.':'.$1;
  }
  if (DBD::MSSQL::Server::return_first_server()->version_is_minimum("9.x")) {
    return $self->fetchrow_array(q{
        SELECT
            cntr_value
        FROM
            sys.dm_os_performance_counters
        WHERE
            counter_name = ? AND
            object_name = ? AND
            instance_name = ?
    }, $counter_name, $object_name, $instance_name);
  } else {
    return $self->fetchrow_array(q{
        SELECT
            cntr_value
        FROM
            master.dbo.sysperfinfo
        WHERE
            counter_name = ? AND
            object_name = ? AND
            instance_name = ?
    }, $counter_name, $object_name, $instance_name);
  }
}

package DBD::MSSQL::Server::Connection::Dbi;

use strict;
use Net::Ping;

our @ISA = qw(DBD::MSSQL::Server::Connection);


sub init {
  my $self = shift;
  my %params = @_;
  my $retval = undef;
  if ($self->{mode} =~ /^server::tnsping/) {
    # erstmal reserviert fuer irgendeinen tcp-connect
    if (! $self->{connect}) {
      $self->{errstr} = "Please specify a database";
    } else {
      $self->{sid} = $self->{connect};
      $self->{username} ||= time;  # prefer an existing user
      $self->{password} = time;
    }
  } else {
    if ((! $self->{hostname} && ! $self->{server}) ||
        ! $self->{username} || ! $self->{password}) {
      $self->{errstr} = "Please specify hostname or server, username and password";
      return undef;
    }
    $self->{dsn} = "DBI:Sybase:";
    if ($self->{hostname}) {
      $self->{dsn} .= sprintf ";host=%s", $self->{hostname};
      $self->{dsn} .= sprintf ";port=%s", $self->{port};
    } else {
      $self->{dsn} .= sprintf ";server=%s", $self->{server};
    }
  }
  if (! exists $self->{errstr}) {
    eval {
      require DBI;
      use POSIX ':signal_h';
      local $SIG{'ALRM'} = sub {
        die "alarm\n";
      };
      my $mask = POSIX::SigSet->new( SIGALRM );
      my $action = POSIX::SigAction->new(
          sub { die "alarm\n" ; }, $mask);
      my $oldaction = POSIX::SigAction->new();
      sigaction(SIGALRM ,$action ,$oldaction );
      alarm($self->{timeout} - 1); # 1 second before the global unknown timeout
      if ($self->{handle} = DBI->connect(
          $self->{dsn},
          $self->{username},
          $self->{password},
          { RaiseError => 1, AutoCommit => 0, PrintError => 1 })) {
        $retval = $self;
      } else {
        # doesnt seem to work $self->{errstr} = DBI::errstr();
        $self->{errstr} = "connect failed";
        return undef;
      }
    };
    if ($@) {
      $self->{errstr} = $@;
      $retval = undef;
    }
  }
  $self->{tac} = Time::HiRes::time();
  return $retval;
}

sub fetchrow_array {
  my $self = shift;
  my $sql = shift;
  my @arguments = @_;
  my $sth = undef;
  my @row = ();
  eval {
    $self->trace(sprintf "SQL:\n%s\nARGS:\n%s\n",
        $sql, Data::Dumper::Dumper(\@arguments));
    $sth = $self->{handle}->prepare($sql);
    if (scalar(@arguments)) {
      $sth->execute(@arguments) || die DBI::errstr();
    } else {
      $sth->execute() || die DBI::errstr();
    }
    if (lc $sql =~ /^(exec |sp_)/) {
      # flatten the result sets
      do {
        while (my $aref = $sth->fetchrow_arrayref()) {
          push(@row, @{$aref});
        }
      } while ($sth->{syb_more_results});
    } else {
      @row = $sth->fetchrow_array();
    }
    $self->trace(sprintf "RESULT:\n%s\n",
        Data::Dumper::Dumper(\@row));
  }; 
  if ($@) {
    $self->debug(sprintf "bumm %s", $@);
  }
  if (-f "/tmp/check_mssql_health_simulation/".$self->{mode}) {
    my $simulation = do { local (@ARGV, $/) = 
        "/tmp/check_mssql_health_simulation/".$self->{mode}; <> };
    @row = split(/\s+/, (split(/\n/, $simulation))[0]);
  }
  return $row[0] unless wantarray;
  return @row;
}

sub fetchall_array {
  my $self = shift;
  my $sql = shift;
  my @arguments = @_;
  my $sth = undef;
  my $rows = undef;
  eval {
    $self->trace(sprintf "SQL:\n%s\nARGS:\n%s\n",
        $sql, Data::Dumper::Dumper(\@arguments));
    $sth = $self->{handle}->prepare($sql);
    if (scalar(@arguments)) {
      $sth->execute(@arguments);
    } else {
      $sth->execute();
    }
    $rows = $sth->fetchall_arrayref();
    $self->trace(sprintf "RESULT:\n%s\n",
        Data::Dumper::Dumper($rows));
  }; 
  if ($@) {
    printf STDERR "bumm %s\n", $@;
  }
  if (-f "/tmp/check_mssql_health_simulation/".$self->{mode}) {
    my $simulation = do { local (@ARGV, $/) = 
        "/tmp/check_mssql_health_simulation/".$self->{mode}; <> };
    @{$rows} = map { [ split(/\s+/, $_) ] } split(/\n/, $simulation);
  }
  return @{$rows};
}

sub exec_sp_1hash {
  my $self = shift;
  my $sql = shift;
  my @arguments = @_;
  my $sth = undef;
  my $rows = undef;
  eval {
    $self->trace(sprintf "SQL:\n%s\nARGS:\n%s\n",
        $sql, Data::Dumper::Dumper(\@arguments));
    $sth = $self->{handle}->prepare($sql);
    if (scalar(@arguments)) {
      $sth->execute(@arguments);
    } else {
      $sth->execute();
    }
    do {
      while (my $href = $sth->fetchrow_hashref()) {
        foreach (keys %{$href}) {
          push(@{$rows}, [ $_, $href->{$_} ]);
        }
      }
    } while ($sth->{syb_more_results});
    $self->trace(sprintf "RESULT:\n%s\n",
        Data::Dumper::Dumper($rows));
  };
  if ($@) {
    printf STDERR "bumm %s\n", $@;
  }
  return @{$rows};
}


sub execute {
  my $self = shift;
  my $sql = shift;
  eval {
    my $sth = $self->{handle}->prepare($sql);
    $sth->execute();
  };
  if ($@) {
    printf STDERR "bumm %s\n", $@;
  }
}

sub DESTROY {
  my $self = shift;
  $self->trace(sprintf "disconnecting DBD %s",
      $self->{handle} ? "with handle" : "without handle");
  $self->{handle}->disconnect() if $self->{handle};
}

package DBD::MSSQL::Server::Connection::Tsql;

use strict;
use File::Temp qw/tempfile/;

our @ISA = qw(DBD::MSSQL::Server::Connection);


sub init {
  my $self = shift;
  my %params = @_;
  my $retval = undef;
  $self->{loginstring} = "traditional";
  ($self->{sql_commandfile_handle}, $self->{sql_commandfile}) =
      tempfile($self->{mode}."XXXXX", SUFFIX => ".sql", 
      DIR => $self->system_tmpdir() );
  close $self->{sql_commandfile_handle};
  ($self->{sql_resultfile_handle}, $self->{sql_resultfile}) =
      tempfile($self->{mode}."XXXXX", SUFFIX => ".out", 
      DIR => $self->system_tmpdir() );
  close $self->{sql_resultfile_handle};
  if ($self->{mode} =~ /^server::tnsping/) {
    if (! $self->{connect}) {
      $self->{errstr} = "Please specify a database";
    } else {
      $self->{sid} = $self->{connect};
      $self->{user} ||= time;  # prefer an existing user
      $self->{password} = time;
    }
  } else {
    if ($self->{connect} && ! $self->{user} && ! $self->{password} &&
        $self->{connect} =~ /(\w+)\/(\w+)@(\w+)/) {
      # --connect nagios/oradbmon@bba
      $self->{connect} = $3;
      $self->{user} = $1;
      $self->{password} = $2;
      $self->{sid} = $self->{connect};
      if ($self->{user} eq "sys") {
        delete $ENV{TWO_TASK};
        $self->{loginstring} = "sys";
      } else {
        $self->{loginstring} = "traditional";
      }
    } elsif ($self->{connect} && ! $self->{user} && ! $self->{password} &&
        $self->{connect} =~ /sysdba@(\w+)/) {
      # --connect sysdba@bba
      $self->{connect} = $1;
      $self->{user} = "/";
      $self->{sid} = $self->{connect};
      $self->{loginstring} = "sysdba";
    } elsif ($self->{connect} && ! $self->{user} && ! $self->{password} &&
        $self->{connect} =~ /(\w+)/) {
      # --connect bba
      $self->{connect} = $1;
      # maybe this is a os authenticated user
      delete $ENV{TWO_TASK};
      $self->{sid} = $self->{connect};
      if ($^O ne "hpux") {       #hpux && 1.21 only accepts "DBI:MSSQL:SID"
        $self->{connect} = "";   #linux 1.20 only accepts "DBI:MSSQL:" + MSSQL_SID
      }
      $self->{user} = '/';
      $self->{password} = "";
      $self->{loginstring} = "extauth";
    } elsif ($self->{user} &&
        $self->{user} =~ /^\/@(\w+)/) {
      # --user /@ubba1
      $self->{user} = $1;
      $self->{sid} = $self->{connect};
      $self->{loginstring} = "passwordstore";
    } elsif ($self->{connect} && $self->{user} && ! $self->{password} &&
        $self->{user} eq "sysdba") {
      # --connect bba --user sysdba
      $self->{connect} = $1;
      $self->{user} = "/";
      $self->{sid} = $self->{connect};
      $self->{loginstring} = "sysdba";
    } elsif ($self->{connect} && $self->{user} && $self->{password}) {
      # --connect bba --user nagios --password oradbmon
      $self->{sid} = $self->{connect};
      $self->{loginstring} = "traditional";
    } else {
      $self->{errstr} = "Please specify database, username and password";
      return undef;
    }
  }
  if (! exists $self->{errstr}) {
    eval {
      $ENV{MSSQL_SID} = $self->{sid};
      $ENV{PATH} = $ENV{MSSQL_HOME}."/bin".
          (defined $ENV{PATH} ? 
          ":".$ENV{PATH} : "");
      $ENV{LD_LIBRARY_PATH} = $ENV{MSSQL_HOME}."/lib".
          (defined $ENV{LD_LIBRARY_PATH} ? 
          ":".$ENV{LD_LIBRARY_PATH} : "");
      # am 30.9.2008 hat perl das /bin/sqlplus in $ENV{MSSQL_HOME}.'/bin/sqlplus' 
      # eiskalt evaluiert und 
      # /u00/app/mssql/product/11.1.0/db_1/u00/app/mssql/product/11.1.0/db_1/bin/sqlplus 
      # draus gemacht. Leider nicht in Mini-Scripts reproduzierbar, sondern nur hier.
      # Das ist der Grund fuer die vielen ' und .
      my $sqlplus = $ENV{MSSQL_HOME}.'/'.'bin'.'/'.'sqlplus';
      if ((-x $ENV{MSSQL_HOME}.'/'.'sqlplus') && ( -f $ENV{MSSQL_HOME}.'/'.'sqlplus')) {
          $sqlplus = $ENV{MSSQL_HOME}.'/'.'sqlplus';
      }
      my $tnsping = $ENV{MSSQL_HOME}.'/'.'bin'.'/'.'tnsping';
      if (! -x $sqlplus) {
        die "nosqlplus\n";
      }
      if ($self->{mode} =~ /^server::tnsping/) {
        if ($self->{loginstring} eq "traditional") {
          $self->{sqlplus} = sprintf "%s -S %s/%s@%s < /dev/null",
              $sqlplus,
              $self->{user}, $self->{password}, $self->{sid};
        } elsif ($self->{loginstring} eq "extauth") {
          $self->{sqlplus} = sprintf "%s -S / < /dev/null",
              $sqlplus;
        } elsif ($self->{loginstring} eq "passwordstore") {
          $self->{sqlplus} = sprintf "%s -S /@%s < /dev/null",
              $sqlplus,
              $self->{user};
        } elsif ($self->{loginstring} eq "sysdba") {
          $self->{sqlplus} = sprintf "%s -S / as sysdba < /dev/null",
              $sqlplus;
        } elsif ($self->{loginstring} eq "sys") {
          $self->{sqlplus} = sprintf "%s -S %s/%s@%s as sysdba < /dev/null",
              $sqlplus,
              $self->{user}, $self->{password}, $self->{sid};
        }
      } else {
        if ($self->{loginstring} eq "traditional") {
          $self->{sqlplus} = sprintf "%s -S %s/%s@%s < %s > %s",
              $sqlplus,
              $self->{user}, $self->{password}, $self->{sid},
              $self->{sql_commandfile}, $self->{sql_resultfile};
        } elsif ($self->{loginstring} eq "extauth") {
          $self->{sqlplus} = sprintf "%s -S / < %s > %s",
              $sqlplus,
              $self->{sql_commandfile}, $self->{sql_resultfile};
        } elsif ($self->{loginstring} eq "passwordstore") {
          $self->{sqlplus} = sprintf "%s -S /@%s < %s > %s",
              $sqlplus,
              $self->{user},
              $self->{sql_commandfile}, $self->{sql_resultfile};
        } elsif ($self->{loginstring} eq "sysdba") {
          $self->{sqlplus} = sprintf "%s -S / as sysdba < %s > %s",
              $sqlplus,
              $self->{sql_commandfile}, $self->{sql_resultfile};
        } elsif ($self->{loginstring} eq "sys") {
          $self->{sqlplus} = sprintf "%s -S %s/%s@%s as sysdba < %s > %s",
              $sqlplus,
              $self->{user}, $self->{password}, $self->{sid},
              $self->{sql_commandfile}, $self->{sql_resultfile};
        }
      }
  
      use POSIX ':signal_h';
      local $SIG{'ALRM'} = sub {
        die "alarm\n";
      };
      my $mask = POSIX::SigSet->new( SIGALRM );
      my $action = POSIX::SigAction->new(
          sub { die "alarm\n" ; }, $mask);
      my $oldaction = POSIX::SigAction->new();
      sigaction(SIGALRM ,$action ,$oldaction );
      alarm($self->{timeout} - 1); # 1 second before the global unknown timeout
  
      if ($self->{mode} =~ /^server::tnsping/) {
        if (-x $tnsping) {
          my $exit_output = `$tnsping $self->{sid}`;
          if ($?) {
          #  printf STDERR "tnsping exit bumm \n";
          # immer 1 bei misserfolg
          }
          if ($exit_output =~ /^OK \(\d+/m) {
            die "ORA-01017"; # fake a successful connect with wrong password
          } elsif ($exit_output =~ /^(TNS\-\d+)/m) {
            die $1;
          } else {
            die "TNS-03505";
          }
        } else {
          my $exit_output = `$self->{sqlplus}`;
          if ($?) {
            printf STDERR "ping exit bumm \n";
          }
          $exit_output =~ s/\n//g;
          $exit_output =~ s/at $0//g;
          chomp $exit_output;
          die $exit_output;
        }
      } else {
        my $answer = $self->fetchrow_array(
            q{ SELECT 42 FROM dual});
        die unless defined $answer and $answer == 42;
      }
      $retval = $self;
    };
    if ($@) {
      $self->{errstr} = $@;
      $self->{errstr} =~ s/at $0 .*//g;
      chomp $self->{errstr};
      $retval = undef;
    }
  }
  $self->{tac} = Time::HiRes::time();
  return $retval;
}


sub fetchrow_array {
  my $self = shift;
  my $sql = shift;
  my @arguments = @_;
  my $sth = undef;
  my @row = ();
  foreach (@arguments) {
    # replace the ? by the parameters
    if (/^\d+$/) {
      $sql =~ s/\?/$_/;
    } else {
      $sql =~ s/\?/'$_'/;
    }
  }
  $self->create_commandfile($sql);
  my $exit_output = `$self->{sqlplus}`;
  if ($?) {
    printf STDERR "fetchrow_array exit bumm \n";
    my $output = do { local (@ARGV, $/) = $self->{sql_resultfile}; <> };
    my @oerrs = map {
      /(ORA\-\d+:.*)/ ? $1 : ();
    } split(/\n/, $output);
    $self->{errstr} = join(" ", @oerrs);
  } else {
    my $output = do { local (@ARGV, $/) = $self->{sql_resultfile}; <> };
    @row = map { convert($_) } 
        map { s/^\s+([\.\d]+)$/$1/g; $_ }         # strip leading space from numbers
        map { s/\s+$//g; $_ }                     # strip trailing space
        split(/\|/, (split(/\n/, $output))[0]);
  }
  if ($@) {
    $self->debug(sprintf "bumm %s", $@);
  }
  unlink $self->{sql_commandfile};
  unlink $self->{sql_resultfile};
  return $row[0] unless wantarray;
  return @row;
}

sub fetchall_array {
  my $self = shift;
  my $sql = shift;
  my @arguments = @_;
  my $sth = undef;
  my $rows = undef;
  foreach (@arguments) {
    # replace the ? by the parameters
    if (/^\d+$/) {
      $sql =~ s/\?/$_/;
    } else {
      $sql =~ s/\?/'$_'/;
    }
  }

  $self->create_commandfile($sql);
  my $exit_output = `$self->{sqlplus}`;
  if ($?) {
    printf STDERR "fetchrow_array exit bumm %s\n", $exit_output;
    my $output = do { local (@ARGV, $/) = $self->{sql_resultfile}; <> };
    my @oerrs = map {
      /(ORA\-\d+:.*)/ ? $1 : ();
    } split(/\n/, $output);
    $self->{errstr} = join(" ", @oerrs);
  } else {
    my $output = do { local (@ARGV, $/) = $self->{sql_resultfile}; <> };
    my @rows = map { [ 
        map { convert($_) } 
        map { s/^\s+([\.\d]+)$/$1/g; $_ }
        map { s/\s+$//g; $_ }
        split /\|/
    ] } grep { ! /^\d+ rows selected/ } 
        grep { ! /^Elapsed: / }
        grep { ! /^\s*$/ } split(/\n/, $output);
    $rows = \@rows;
  }
  if ($@) {
    $self->debug(sprintf "bumm %s", $@);
  }
  unlink $self->{sql_commandfile};
  unlink $self->{sql_resultfile};
  return @{$rows};
}

sub func {
  my $self = shift;
  my $function = shift;
  $self->{handle}->func(@_);
}

sub convert {
  my $n = shift;
  # mostly used to convert numbers in scientific notation
  if ($n =~ /^\s*\d+\s*$/) {
    return $n;
  } elsif ($n =~ /^\s*([-+]?)(\d*[\.,]*\d*)[eE]{1}([-+]?)(\d+)\s*$/) {
    my ($vor, $num, $sign, $exp) = ($1, $2, $3, $4);
    $n =~ s/E/e/g;
    $n =~ s/,/\./g;
    $num =~ s/,/\./g;
    my $sig = $sign eq '-' ? "." . ($exp - 1 + length $num) : '';
    my $dec = sprintf "%${sig}f", $n;
    $dec =~ s/\.[0]+$//g;
    return $dec;
  } elsif ($n =~ /^\s*([-+]?)(\d+)[\.,]*(\d*)\s*$/) {
    return $1.$2.".".$3;
  } elsif ($n =~ /^\s*(.*?)\s*$/) {
    return $1;
  } else {
    return $n;
  }
}


sub execute {
  my $self = shift;
  my $sql = shift;
  eval {
    my $sth = $self->{handle}->prepare($sql);
    $sth->execute();
  };
  if ($@) {
    printf STDERR "bumm %s\n", $@;
  }
}

sub DESTROY {
  my $self = shift;
  $self->trace("try to clean up command and result files");
  unlink $self->{sql_commandfile} if -f $self->{sql_commandfile};
  unlink $self->{sql_resultfile} if -f $self->{sql_resultfile};
}

sub create_commandfile {
  my $self = shift;
  my $sql = shift;
  open CMDCMD, "> $self->{sql_commandfile}"; 
  printf CMDCMD "SET HEADING OFF\n";
  printf CMDCMD "SET PAGESIZE 0\n";
  printf CMDCMD "SET LINESIZE 32767\n";
  printf CMDCMD "SET COLSEP '|'\n";
  printf CMDCMD "SET TAB OFF\n";
  printf CMDCMD "SET TRIMSPOOL ON\n";
  printf CMDCMD "SET NUMFORMAT 9.999999EEEE\n";
  printf CMDCMD "SPOOL %s\n", $self->{sql_resultfile};
#  printf CMDCMD "ALTER SESSION SET NLS_NUMERIC_CHARACTERS='.,';\n/\n";
  printf CMDCMD "%s\n/\n", $sql;
  printf CMDCMD "EXIT\n";
  close CMDCMD;
}

package DBD::MSSQL::Server::Connection::Sqlrelay;

use strict;
use Net::Ping;

our @ISA = qw(DBD::MSSQL::Server::Connection);


sub init {
  my $self = shift;
  my %params = @_;
  my $retval = undef;
  if ($self->{mode} =~ /^server::tnsping/) {
  } else {
    if (! $self->{hostname} || ! $self->{username} || ! $self->{password} || ! $self->{port}) {
      $self->{errstr} = "Please specify database, username and password";
      return undef;
    }
  }
  if (! exists $self->{errstr}) {
    eval {
      require DBI;
      use POSIX ':signal_h';
      local $SIG{'ALRM'} = sub {
        die "alarm\n";
      };
      my $mask = POSIX::SigSet->new( SIGALRM );
      my $action = POSIX::SigAction->new(
      sub { die "alarm\n" ; }, $mask);
      my $oldaction = POSIX::SigAction->new();
      sigaction(SIGALRM ,$action ,$oldaction );
      alarm($self->{timeout} - 1); # 1 second before the global unknown timeout
      if ($self->{handle} = DBI->connect(
          #sprintf("DBI:SQLRelay:host=%s;port=%d;socket=%s", 
          sprintf("DBI:SQLRelay:host=%s;port=%d;",
              $self->{hostname}, $self->{port}),
        $self->{username},
        $self->{password},
        { RaiseError => 1, AutoCommit => 0, PrintError => 1 })) {
      } else {
        $self->{errstr} = DBI::errstr();
      }
    };
    if ($@) {
      $self->{errstr} = $@;
      $self->{errstr} =~ s/at [\w\/\.]+ line \d+.*//g;
      $retval = undef;
    }
  }
  $self->{tac} = Time::HiRes::time();
  return $retval;
}

sub fetchrow_array {
  my $self = shift;
  my $sql = shift;
  my @arguments = @_;
  my $sth = undef;
  my @row = ();
  my $new_dbh = $self->{handle}->clone();
  $self->trace(sprintf "fetchrow_array: %s", $sql);
  #
  # does not work with bind variables
  #
  while ($sql =~ /\?/) {
    my $param = shift @arguments;
    if ($param !~ /^\d+$/) {
      $param = $self->{handle}->quote($param);
    }
    $sql =~ s/\?/$param/;
  }
  $sql =~ s/^\s*//g;
  $sql =~ s/\s*$//g;
  eval {
    $sth = $self->{handle}->prepare($sql);
    if (scalar(@arguments)) {
      $sth->execute(@arguments);
    } else {
      $sth->execute();
    }
    @row = $sth->fetchrow_array();
    $sth->finish();
  };
  if ($@) {
    $self->debug(sprintf "bumm %s", $@);
  }
  # without this trick, there are error messages like
  # "No server-side cursors were available to process the query"
  # and the results are messed up.
  $self->{handle}->disconnect();
  $self->{handle} = $new_dbh;
  if (-f "/tmp/check_mssql_health_simulation/".$self->{mode}) {
    my $simulation = do { local (@ARGV, $/) =
        "/tmp/check_mssql_health_simulation/".$self->{mode}; <> };
    @row = split(/\s+/, (split(/\n/, $simulation))[0]);
  }
  return $row[0] unless wantarray;
  return @row;
}

sub fetchall_array {
  my $self = shift;
  my $sql = shift;
  my @arguments = @_;
  my $sth = undef;
  my $rows = undef;
  my $new_dbh = $self->{handle}->clone();
  $self->trace(sprintf "fetchall_array: %s", $sql);
  while ($sql =~ /\?/) {
    my $param = shift @arguments;
    if ($param !~ /^\d+$/) {
      $param = $self->{handle}->quote($param);
    }
    $sql =~ s/\?/$param/;
  }
  eval {
    $sth = $self->{handle}->prepare($sql);
    if (scalar(@arguments)) {
      $sth->execute(@arguments);
    } else {
      $sth->execute();
    }
    $rows = $sth->fetchall_arrayref();
    my $asrows = $sth->fetchall_arrayref();
    $sth->finish();
  };
  if ($@) {
    printf STDERR "bumm %s\n", $@;
  }
  $self->{handle}->disconnect();
  $self->{handle} = $new_dbh;
  if (-f "/tmp/check_mssql_health_simulation/".$self->{mode}) {
    my $simulation = do { local (@ARGV, $/) =
        "/tmp/check_mssql_health_simulation/".$self->{mode}; <> };
    @{$rows} = map { [ split(/\s+/, $_) ] } split(/\n/, $simulation);
  }
  return @{$rows};
}

sub func {
  my $self = shift;
  $self->{handle}->func(@_);
}


sub execute {
  my $self = shift;
  my $sql = shift;
  eval {
    my $sth = $self->{handle}->prepare($sql);
    $sth->execute();
  };
  if ($@) {
    printf STDERR "bumm %s\n", $@;
  }
}

sub DESTROY {
  my $self = shift;
  #$self->trace(sprintf "disconnecting DBD %s",
  #    $self->{handle} ? "with handle" : "without handle");
  #$self->{handle}->disconnect() if $self->{handle};
}






package main;

use strict;
use Getopt::Long qw(:config no_ignore_case);
use File::Basename;
use lib dirname($0);



use vars qw ($PROGNAME $REVISION $CONTACT $TIMEOUT $STATEFILESDIR $needs_restart %commandline);

$PROGNAME = "check_mssql_health";
$REVISION = '$Revision: 1.5.3 $';
$CONTACT = 'gerhard.lausser@consol.de';
$TIMEOUT = 60;
$STATEFILESDIR = '/var/tmp/check_mssql_health';
$needs_restart = 0;

my @modes = (
  ['server::connectiontime',
      'connection-time', undef,
      'Time to connect to the server' ],
  ['server::cpubusy',
      'cpu-busy', undef,
      'Cpu busy in percent' ],
  ['server::iobusy',
      'io-busy', undef,
      'IO busy in percent' ],
  ['server::fullscans',
      'full-scans', undef,
      'Full table scans per second' ],
  ['server::connectedusers',
      'connected-users', undef,
      'Number of currently connected users' ],
  ['server::database::transactions',
      'transactions', undef,
      'Transactions per second (per database)' ],
  ['server::batchrequests',
      'batch-requests', undef,
      'Batch requests per second' ],
  ['server::latch::waits',
      'latches-waits', undef,
      'Number of latch requests that could not be granted immediately' ],
  ['server::latch::waittime',
      'latches-wait-time', undef,
      'Average time for a latch to wait before the request is met' ],
  ['server::memorypool::lock::waits',
      'locks-waits', undef,
      'The number of locks per second that had to wait' ],
  ['server::memorypool::lock::timeouts',
      'locks-timeouts', undef,
      'The number of locks per second that timed out' ],
  ['server::memorypool::lock::deadlocks',
      'locks-deadlocks', undef,
      'The number of deadlocks per second' ],
  ['server::sql::recompilations',
      'sql-recompilations', undef,
      'Re-Compilations per second' ],
  ['server::sql::initcompilations',
      'sql-initcompilations', undef,
      'Initial compilations per second' ],
  ['server::totalmemory',
      'total-server-memory', undef,
      'The amount of memory that SQL Server has allocated to it' ],
  ['server::memorypool::buffercache::hitratio',
      'mem-pool-data-buffer-hit-ratio', ['buffer-cache-hit-ratio'],
      'Data Buffer Cache Hit Ratio' ],
  ['server::memorypool::buffercache::hitratio',
      'mem-pool-data-buffer-hit-ratio', ['buffer-cache-hit-ratio'],
      'Data Buffer Cache Hit Ratio' ],


  ['server::memorypool::buffercache::lazywrites',
      'lazy-writes', undef,
      'Lazy writes per second' ],
  ['server::memorypool::buffercache::pagelifeexpectancy',
      'page-life-expectancy', undef,
      'Seconds a page is kept in memory before being flushed' ],
  ['server::memorypool::buffercache::freeliststalls',
      'free-list-stalls', undef,
      'Requests per second that had to wait for a free page' ],
  ['server::memorypool::buffercache::checkpointpages',
      'checkpoint-pages', undef,
      'Dirty pages flushed to disk per second. (usually by a checkpoint)' ],


  ['server::database::databasefree',
      'database-free', undef,
      'Free space in database' ],
  ['server::database::backupage',
      'backup-age', undef,
      'Elapsed time (in hours) since a database was last backupped' ],
  ['server::sql',
      'sql', undef,
      'any sql command returning a single number' ],
  ['server::database::listdatabases',
      'list-databases', undef,
      'convenience function which lists all databases' ],
  ['server::database::datafile::listdatafiles',
      'list-datafiles', undef,
      'convenience function which lists all datafiles' ],
  ['server::memorypool::lock::listlocks',
      'list-locks', undef,
      'convenience function which lists all locks' ],
);

sub print_usage () {
  print <<EOUS;
  Usage:
    $PROGNAME [-v] [-t <timeout>] --hostname=<db server hostname>
        --username=<username> --password=<password> [--port <port>]
        --mode=<mode>
    $PROGNAME [-h | --help]
    $PROGNAME [-V | --version]

  Options:
    --hostname
       the database server
    --username
       the mssql user
    --password
       the mssql user's password
    --warning
       the warning range
    --critical
       the critical range
    --mode
       the mode of the plugin. select one of the following keywords:
EOUS
  my $longest = length ((reverse sort {length $a <=> length $b} map { $_->[1] } @modes)[0]);
  my $format = "       %-".
  (length ((reverse sort {length $a <=> length $b} map { $_->[1] } @modes)[0])).
  "s\t(%s)\n";
  foreach (@modes) {
    printf $format, $_->[1], $_->[3];
  }
  printf "\n";
  print <<EOUS;
    --name
       the name of the database etc depending on the mode.
    --name2
       if name is a sql statement, this statement would appear in
       the output and the performance data. This can be ugly, so 
       name2 can be used to appear instead.
    --regexp
       if this parameter is used, name will be interpreted as a 
       regular expression.
    --units
       one of %, KB, MB, GB. This is used for a better output of mode=sql
       and for specifying thresholds for mode=tablespace-free

  Database-related modes check all databases in one run by default.
  If only a single database should be checked, use the --name parameter.
  The same applies to datafile-related modes.
  
  In mode sql you can url-encode the statement so you will not have to mess
  around with special characters in your Nagios service definitions.
  Instead of 
  --name="select count(*) from master..sysprocesses"
  you can say 
  --name=select%20count%28%2A%29%20from%20master%2E%2Esysprocesses
  For your convenience you can call check_mssql_health with the --encode
  option and it will encode the standard input.

  You can find the full documentation for this plugin at
  http://www.consol.de/opensource/nagios/check-mssql-health or
  http://www.consol.com/opensource/nagios/check-mssql-health


EOUS
#
# --basis
#  one of rate, delta, value
  
}

sub print_help () {
  print "Copyright (c) 2009 Gerhard Lausser\n\n";
  print "\n";
  print "  Check various parameters of MSSQL databases \n";
  print "\n";
  print_usage();
  support();
}


sub print_revision ($$) {
  my $commandName = shift;
  my $pluginRevision = shift;
  $pluginRevision =~ s/^\$Revision: //;
  $pluginRevision =~ s/ \$\s*$//;
  print "$commandName ($pluginRevision)\n";
  print "This nagios plugin comes with ABSOLUTELY NO WARRANTY. You may redistribute\ncopies of this plugin under the terms of the GNU General Public License.\n";
}

sub support () {
  my $support='Send email to gerhard.lausser@consol.de if you have questions\nregarding use of this software. \nPlease include version information with all correspondence (when possible,\nuse output from the --version option of the plugin itself).\n';
  $support =~ s/@/\@/g;
  $support =~ s/\\n/\n/g;
  print $support;
}

sub contact_author ($$) {
  my $item = shift;
  my $strangepattern = shift;
  if ($commandline{verbose}) {
    printf STDERR
        "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n".
        "You found a line which is not recognized by %s\n".
        "This means, certain components of your system cannot be checked.\n".
        "Please contact the author %s and\nsend him the following output:\n\n".
        "%s /%s/\n\nThank you!\n".
        "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n",
            $PROGNAME, $CONTACT, $item, $strangepattern;
  }
}

%commandline = ();
my @params = (
    "timeout|t=i",
    "version|V",
    "help|h",
    "verbose|v",
    "debug|d",
    "hostname=s",
    "username=s",
    "password=s",
    "port=i",
    "server=s",
    "mode|m=s",
    "tablespace=s",
    "database=s",
    "datafile=s",
    "waitevent=s",
    "namefromfile=s",
    "queryfile=s",
    "name=s",
    "name2=s",
    "regexp",
    "perfdata",
    "warning=s",
    "critical=s",
    "absolute|a",
    "basis",
    "lookback|l=i",
    "environment|e=s%",
    "method=s",
    "runas|r=s",
    "scream",
    "shell",
    "eyecandy",
    "encode",
    "units=s",
    "3");

if (! GetOptions(\%commandline, @params)) {
  print_help();
  exit $ERRORS{UNKNOWN};
}

if (exists $commandline{version}) {
  print_revision($PROGNAME, $REVISION);
  exit $ERRORS{OK};
}

if (exists $commandline{help}) {
  print_help();
  exit $ERRORS{OK};
} elsif (! exists $commandline{mode}) {
  printf "Please select a mode\n";
  print_help();
  exit $ERRORS{OK};
}

if ($commandline{mode} eq "encode") {
  my $input = <>;
  chomp $input;
  $input =~ s/([^A-Za-z0-9])/sprintf("%%%02X", ord($1))/seg;
  printf "%s\n", $input;
  exit $ERRORS{OK};
}

if (!exists $commandline{queryfile} || !$commandline{queryfile}) {
	$commandline{queryfile} = "/etc/nagios/check_mssql_health-queries";
}


if (exists $commandline{3}) {
  $ENV{NRPE_MULTILINESUPPORT} = 1;
}

if (exists $commandline{timeout}) {
  $TIMEOUT = $commandline{timeout};
}

if (exists $commandline{verbose}) {
  $DBD::MSSQL::Server::verbose = exists $commandline{verbose};
}

if (exists $commandline{scream}) {
#  $DBD::MSSQL::Server::hysterical = exists $commandline{scream};
}

$DBD::MSSQL::Server::my_modules_dyn_dir = '/usr/local/nagios/libexec';

if (exists $commandline{environment}) {
  # if the desired environment variable values are different from
  # the environment of this running script, then a restart is necessary.
  # because setting $ENV does _not_ change the environment of the running script.
  foreach (keys %{$commandline{environment}}) {
    if ((! $ENV{$_}) || ($ENV{$_} ne $commandline{environment}->{$_})) {
      $needs_restart = 1;
      $ENV{$_} = $commandline{environment}->{$_};
      printf STDERR "new %s=%s forces restart\n", $_, $ENV{$_} 
          if $DBD::MSSQL::Server::verbose;
    }
  }
  # e.g. called with --runas dbnagio. shlib_path environment variable is stripped
  # during the sudo.
  # so the perl interpreter starts without a shlib_path. but --runas cares for
  # a --environment shlib_path=...
  # so setting the environment variable in the code above and restarting the 
  # perl interpreter will help it find shared libs
}

if (exists $commandline{runas}) {
  # remove the runas parameter
  # exec sudo $0 ... the remaining parameters
  $needs_restart = 1;
  # if the calling script has a path for shared libs and there is no --environment
  # parameter then the called script surely needs the variable too.
  foreach my $important_env qw(LD_LIBRARY_PATH SHLIB_PATH 
      MSSQL_HOME TNS_ADMIN ORA_NLS ORA_NLS33 ORA_NLS10) {
    if ($ENV{$important_env} && ! scalar(grep { /^$important_env=/ } 
        keys %{$commandline{environment}})) {
      $commandline{environment}->{$important_env} = $ENV{$important_env};
      printf STDERR "add important --environment %s=%s\n", 
          $important_env, $ENV{$important_env} if $DBD::MSSQL::Server::verbose;
    }
  }
}

if (exists $commandline{namefromfile}) {
	if (!open QF, "<$commandline{queryfile}") {
		print "Unable to open queryfile $commandline{queryfile} param --queryfile\n";
		print_help();
		exit $ERRORS{OK};
	}
	
	my $sql = '';
	while (my $l = <QF>) {
		# Double chomp if needed
		chomp($l) for (0..1);
		
		$l =~ s/#.*$//g;
		
		my ($k, $sql_line) = split(/\s*=\s*/, $l, 2);
		#printf("l: %s\nk: %s sql: %s\n", $l, $k, $sql_line);
		
		if ($k eq $commandline{namefromfile}) {
			$sql = $sql_line;
			last;
		}
	}
	close QF;

	if (!$sql) {
		print "Unable to find namefromfile key $commandline{namefromfile} in file $commandline{queryfile}\n";
		exit $ERRORS{OK};
	}
	$commandline{name}=$sql;
}

if ($needs_restart) {
  my @newargv = ();
  my $runas = undef;
  if (exists $commandline{runas}) {
    $runas = $commandline{runas};
    delete $commandline{runas};
  }
  foreach my $option (keys %commandline) {
    if (grep { /^$option/ && /=/ } @params) {
      if (ref ($commandline{$option}) eq "HASH") {
        foreach (keys %{$commandline{$option}}) {
          push(@newargv, sprintf "--%s", $option);
          push(@newargv, sprintf "%s=%s", $_, $commandline{$option}->{$_});
        }
      } else {
        push(@newargv, sprintf "--%s", $option);
        push(@newargv, sprintf "%s", $commandline{$option});
      }
    } else {
      push(@newargv, sprintf "--%s", $option);
    }
  }
  if ($runas && ($> == 0)) {
    # this was not my idea. some people connect as root to their nagios clients.
    exec "su", "-c", sprintf("%s %s", $0, join(" ", @newargv)), "-", $runas;
  } elsif ($runas) {
    exec "sudo", "-S", "-u", $runas, $0, @newargv;
  } else {
    exec $0, @newargv;  
    # this makes sure that even a SHLIB or LD_LIBRARY_PATH are set correctly
    # when the perl interpreter starts. Setting them during runtime does not
    # help loading e.g. libclntsh.so
  }
  exit;
}

if (exists $commandline{shell}) {
  # forget what you see here.
  system("/bin/sh");
}

if (exists $commandline{name}) {
  # objects can be encoded like an url
  # with s/([^A-Za-z0-9])/sprintf("%%%02X", ord($1))/seg;
  if (($commandline{mode} ne "sql") || 
      (($commandline{mode} eq "sql") &&
       ($commandline{name} =~ /select%20/i))) { # protect ... like '%cac%' ... from decoding
    $commandline{name} =~ s/\%([A-Fa-f0-9]{2})/pack('C', hex($1))/seg;
  }
  if ($commandline{name} =~ /^0$/) {
    # without this, $params{selectname} would be treated like undef
    $commandline{name} = "00";
  } 
}

$SIG{'ALRM'} = sub {
  printf "UNKNOWN - %s timed out after %d seconds\n", $PROGNAME, $TIMEOUT;
  exit $ERRORS{UNKNOWN};
};
alarm($TIMEOUT);

my $nagios_level = $ERRORS{UNKNOWN};
my $nagios_message = "";
my $perfdata = "";
my $racmode = 0;
if ($commandline{mode} =~ /^rac-([^\-.]+)/) {
  $racmode = 1;
  $commandline{mode} =~ s/^rac\-//g;
}
if ($commandline{mode} =~ /^my-([^\-.]+)/) {
  my $param = $commandline{mode};
  $param =~ s/\-/::/g;
  push(@modes, [$param, $commandline{mode}, undef, 'my extension']);
} elsif ((! grep { $commandline{mode} eq $_ } map { $_->[1] } @modes) &&
    (! grep { $commandline{mode} eq $_ } map { defined $_->[2] ? @{$_->[2]} : () } @modes)) {
  printf "UNKNOWN - mode %s\n", $commandline{mode};
  print_usage();
  exit 3;
}

my %params = (
    timeout => $TIMEOUT,
    mode => (
        map { $_->[0] } 
        grep {
           ($commandline{mode} eq $_->[1]) || 
           ( defined $_->[2] && grep { $commandline{mode} eq $_ } @{$_->[2]}) 
        } @modes
    )[0],
    racmode => $racmode,
    method => $commandline{method} ||
        $ENV{NAGIOS__SERVICEMSSQL_METH} ||
        $ENV{NAGIOS__HOSTMSSQL_METH} || 'dbi',
    hostname => $commandline{hostname}  || 
        $ENV{NAGIOS__SERVICEMSSQL_HOST} ||
        $ENV{NAGIOS__HOSTMSSQL_HOST},
    username => $commandline{username} || 
        $ENV{NAGIOS__SERVICEMSSQL_USER} ||
        $ENV{NAGIOS__HOSTMSSQL_USER},
    password => $commandline{password} || 
        $ENV{NAGIOS__SERVICEMSSQL_PASS} ||
        $ENV{NAGIOS__HOSTMSSQL_PASS},
    port => $commandline{port} || 
        $ENV{NAGIOS__SERVICEMSSQL_PORT} ||
        $ENV{NAGIOS__HOSTMSSQL_PORT},
    server => $commandline{server}  || 
        $ENV{NAGIOS__SERVICEMSSQL_SERVER} ||
        $ENV{NAGIOS__HOSTMSSQL_SERVER},
    warningrange => $commandline{warning},
    criticalrange => $commandline{critical},
    absolute => $commandline{absolute},
    lookback => $commandline{lookback},
    tablespace => $commandline{tablespace},
    database => $commandline{database},
    datafile => $commandline{datafile},
    basis => $commandline{basis},
    selectname => $commandline{name} || $commandline{tablespace} || $commandline{datafile},
    regexp => $commandline{regexp},
    name => $commandline{name},
    name2 => $commandline{name2} || $commandline{name},
    units => $commandline{units},
    eyecandy => $commandline{eyecandy},
    statefilesdir => $STATEFILESDIR,
);

my $server = undef;

$server = DBD::MSSQL::Server->new(%params);
$server->nagios(%params);
$server->calculate_result();
$nagios_message = $server->{nagios_message};
$nagios_level = $server->{nagios_level};
$perfdata = $server->{perfdata};

printf "%s - %s", $ERRORCODES{$nagios_level}, $nagios_message;
printf " | %s", $perfdata if $perfdata;
printf "\n";
exit $nagios_level;