#!/usr/bin/perl -w

use strict;
use warnings;
use Config::Simple '-strict';
use Getopt::Long;
use File::Which;
use File::Basename;
use Zabbix::Agent::Addons::Disks;
use Zabbix::Agent::Addons::UPS;

# Output file
my $output = undef;
# When a threshold can be automatically detected,
# you may want to be notified before it's reached, so you can 
# set a margin which will be substracted from the real threshold
my $temp_margin    = '20';
my $temp_hd_margin = '10';
my $pwr_margin     = '200';
my $pwr_rel_margin = '20';
# This value will be substracted from the higher threshold to define the low one
# so you can have hysteresis to prevent flip-flop
my $temp_hyst     = '10';
my $temp_hd_hyst  = '5';
my $temp_ups_hyst = '5';
my $pwr_hyst      = '200';
my $pwr_rel_hyst  = '10';

# Default threshold if not detected
my $def_temp_thres_high     = '50';
my $def_hd_temp_thres_high  = '50';
my $def_ups_temp_thres_high = '40';
my $def_fan_thres_high      = '1000';
my $def_fan_thres_low       = '700';
my $def_pwr_thres_high      = '1000';
my $def_pwr_rel_thres_high  = '80';

GetOptions(
  "output=s"          => \$output,
  "temp-margin=i"     => \$temp_margin,
  "temp-hd-margin=i"  => \$temp_hd_margin,
  "pwr-margin=i"      => \$pwr_margin,
  "pwr-rel-margin=i"  => \$pwr_rel_margin,
  "temp-hyst=i"       => \$temp_hyst,
  "temp-hd-hyst=i"    => \$temp_hd_hyst,
  "temp-ups-hyst=i"   => \$temp_ups_hyst,
  "pwr-hyst=i"        => \$pwr_hyst,
  "pwr-rel-hys=i"     => \$pwr_rel_hyst
);

sub usage(){
  print<<"_EOF";
Usage: $0 --output=/etc/zabbix/sensors.ini
_EOF
}

unless ($output){
  usage();
  exit 1;
}

# Path
my $ipmitool = which('ipmitool');
my $smartctl = which('smartctl');
my $lmsensor = which('sensors');
my $upsc     = which('upsc');

my $cfg = new Config::Simple(syntax => 'ini');

my $sensors = {};

# Try to detect IPMI sensors
if ($ipmitool && -x $ipmitool){
  # First check for temperature sensors
  my @lines = qx($ipmitool sdr type Temperature);
  if ($? == 0){
    SENSOR: foreach my $l (@lines){
      chomp $l;
      # Looks like
      # Inlet Temp       | 04h | ok  |  7.1 | 25 degrees C
      if ($l !~ m/^(\w+[\s\w\/\-]+?\w+)\s*\|.*\|\s*([\w\.\s]+)\s*\|.*\|\s*([\-\w\.\s]+)$/){
        next SENSOR;
      }
      my $name = $1;
      my $sensor = {};

      my @details = qx($ipmitool sdr get '$name');
      if ($? != 0){
        print "Couldn't get detail for sensor $name\n";
        next SENSOR;
      }
      my $val = undef;
      foreach my $d (@details){
        chomp $d;
        if ($d =~ m/^\s*Sensor\sReading\s*:\s*(\-?\w+)/){
          $val = $1;
          print "Sensor $name has value: $val\n";
          if ($val !~ m/^\-?\d+$/){
            print "Skipping sensor $name, couldn't parse its value: $val\n";
            next SENSOR;
          }
        }
        elsif ($d =~ m/^\s*Upper\scritical\s*:\s*(\-?\d+(\.\d+))/){
          $sensor->{threshold_high} = $1-$temp_margin;
        }
        elsif ($d =~ m/^\s*Upper\snon\-critical\s*:\s*(\-?\d+(\.\d+))/){
          $sensor->{threshold_low} = $1-$temp_margin;
        }
      }
      # Another loop to check for Normal max if Upper critical wasn't found
      if (!$sensor->{threshold_high}){
        foreach my $d (@details){
          chomp $d;
          if ($d =~ m/^\s*Normal\sMaximum\s*:\s*(\-?\d+(\.\d+))/){
            $sensor->{threshold_high} = $1-$temp_margin;
          }
        }
      }
      next SENSOR unless $val;
      $sensor->{threshold_low}  ||= ($sensor->{threshold_high}) ? $sensor->{threshold_high}-$temp_hyst : $def_temp_thres_high-$temp_hyst;
      $sensor->{threshold_high} ||= $def_temp_thres_high;
      $sensor->{threshold_high} =~ s/\.0+$//;
      $sensor->{threshold_low}  =~ s/\.0+$//;
      $sensor->{description}    = $name;
      $sensor->{type}           = 'temp';
      $sensor->{unit}           = '°C';
      $sensor->{cmd}            = "$ipmitool sdr get '$name' | grep 'Sensor Reading' | awk '{print \$4}' | head -1";
      my $id = sensor_name($name);
      $sensors->{$id} = $sensor;
      print "Found a temperature sensor using IPMI: $name\n";
    }
  }
  # Now check for Fan, nearly the same as Temp, but
  # * We try to detect the unit
  # * threshold handling is not the same
  @lines = qx($ipmitool sdr type Fan);
  if ($? == 0){
    SENSOR: foreach my $l (@lines){
      chomp $l;
      if ($l !~ m/^(\w+[\s\w]+?\w+)\s*\|.*\|\s*([\w\.\s]+)\s*\|.*\|\s*([\-\w\.\s]+)$/){
        next SENSOR;
      }
      my $name   = $1;
      my $value  = $3;
      my $sensor = {};

      my @details = qx($ipmitool sdr get '$name');
      if ($? != 0){
        print "Couldn't get detail for sensor $name\n";
        next SENSOR;
      }
      my $val = undef;
      foreach my $d (@details){
        chomp $d;
        if ($d =~ m/^\s*Sensor\sReading\s*:\s*(\w+)/){
          $val = $1;
          if ($val !~ m/^\d+$/){
            print "Skipping sensor $name, couldn't parse its value: $val\n";
            next SENSOR;
          }
        }
        elsif ($d =~ m/^\s*Lower\scritical\s*:\s*(\d+(\.\d+))/){
          $sensor->{threshold_low} = $1-$temp_margin;
        }
        elsif ($d =~ m/^\s*Lower\snon\-critical\s*:\s*(\d+(\.\d+))/){
          $sensor->{threshold_high} = $1-$temp_margin;
        }
      }
      next SENSOR unless $val;
      $sensor->{threshold_high} ||= $def_fan_thres_high;
      $sensor->{threshold_low}  ||= $def_fan_thres_high-$temp_hyst;
      $sensor->{threshold_high} =~ s/\.0+$//;
      $sensor->{threshold_low}  =~ s/\.0+$//;
      $sensor->{description}    = $name;
      $sensor->{type}           = 'fan';
      $sensor->{unit}           = ($value =~ m/percent|%/ || $val < 100) ? '%' : 'rpm';
      $sensor->{cmd}            = "$ipmitool sdr get '$name' | grep 'Sensor Reading' | awk '{print \$4}' | head -1";
      my $id = sensor_name($name);
      $sensors->{$id} = $sensor;
      print "Found a fan sensor using IPMI: $name\n";
    }
  }
  # Now look for power information
  @lines = qx($ipmitool sdr type 'Current');
  if ($? == 0){
    SENSOR: foreach my $l (@lines){
      chomp $l;
      if ($l !~ m/^(\w+[\s\w]+?\w+(\s%)?)\s*\|.*\|\s*([\w\.\s]+)\s*\|.*\|\s*([\-\w\.\s]+)$/){
        print "Skiping line $l\n";
        next SENSOR;
      }
      my $name   = $1;
      my $value  = $4;
      my $sensor = {};
      if ($name =~ m/(Power)|(Pwr)|(Consumption)|(PS\d+\sCurr\sOut)/i || $value =~ m/W(att)?/i){
        my @details = qx($ipmitool sdr get '$name');
        if ($? != 0){
          print "Couldn't get detail for sensor $name\n";
          next SENSOR;
        }
        my $val = undef;
        my $unit = ($name =~ m/%/) ? '%' : 'Watt';
        foreach my $d (@details){
          chomp $d;
          if ($d =~ m/^\s*Sensor\sReading\s*:\s*(\w+)/){
            $val = $1;
            if ($val !~ m/^\d+$/){
              print "Skipping sensor $name, couldn't parse its value: $val\n";
              next SENSOR;
            }
          }
          elsif ($d =~ m/^\s*Upper\scritical\s*:\s*(\d+(\.\d+)?)/){
            $sensor->{threshold_high} = ($unit eq '%') ? $1-$pwr_rel_margin : $1-$pwr_margin;
          }
          elsif ($d =~ m/^\s*Upper\snon\-critical\s*:\s*(\d+(\.\d+)?)/){
            $sensor->{threshold_low} = ($unit eq '%') ? $1-$pwr_rel_margin : $1-$pwr_margin;
          }
        }
        next SENSOR unless $val;
        $sensor->{threshold_high} ||= ($unit eq '%') ? $def_pwr_rel_thres_high : $def_pwr_thres_high;
        $sensor->{threshold_low}  ||= ($unit eq '%') ? $def_pwr_rel_thres_high-$pwr_rel_hyst : $def_pwr_thres_high-$pwr_hyst;
        $sensor->{threshold_high} =~ s/\.0+$//;
        $sensor->{threshold_low}  =~ s/\.0+$//;
        $sensor->{description}    = $name;
        $sensor->{type}           = 'power';
        $sensor->{unit}           = ($name =~ m/%/) ? '%' : 'Watt';
        $sensor->{cmd}            = "$ipmitool sdr get '$name' | grep 'Sensor Reading' | awk '{print \$4}' | head -1";
        my $id = sensor_name($name);
        $sensors->{$id} = $sensor;
        print "Found a power sensor using IPMI: $name\n";
      }
    }
  }
}

# Try to detect lm_sensors, using the sensors command
if ($lmsensor && -x $lmsensor){
  my @lines = qx($lmsensor);
  if ($? == 0){
    SENSOR: foreach my $l (@lines){
      chomp $l;
      # Looks like
      # temp1:       +27.8°C  (crit = +119.0°C)
      # or
      # Core 0:        +36.0°C  (high = +80.0°C, crit = +100.0°C)
      if ($l !~ m/^(\w+[\s\w]+?):\s*\+?(\d+)(\.\d+)?°C\s*(.*)$/){
        next SENSOR;
      }
      my $name   = $1;
      my $val    = $2;
      my $thr    = $4;
      my $sensor = {};

      if ($val !~ m/^\-?\d+$/){
        print "Skipping sensor $name, couldn't parse its value: $val\n";
        next SENSOR;
      }

      if ($name =~ m/^Core\s+\d+/){
        print "Skipping individual core sensor $name\n";
        next SENSOR;
      }

      if ($thr =~ m/high\s+=\s+\+(\d+(\.\d+)?)/){
        $sensor->{threshold_high} = $1;
      }
      elsif ($thr =~ m/^crit\s+=\s+\+(\d+(\.\d+)?)/){
        $sensor->{threshold_high} = $1 - $temp_margin;
      }

      next SENSOR unless $val;
      $sensor->{threshold_low}  ||= ($sensor->{threshold_high}) ? $sensor->{threshold_high}-$temp_hyst : $def_temp_thres_high-$temp_hyst;
      $sensor->{threshold_high} ||= $def_temp_thres_high;
      $sensor->{threshold_high} =~ s/\.0+$//;
      $sensor->{threshold_low}  =~ s/\.0+$//;
      $sensor->{description}    = $name;
      $sensor->{type}           = 'temp';
      $sensor->{unit}           = '°C';
      $sensor->{cmd}            = "$lmsensor | grep '$name:' | cut -d+ -f2 | cut -d. -f1 | head -1";
      my $id = sensor_name($name);
      $sensors->{$id} = $sensor;
      print "Found a temperature sensor using lm_sensors: $name\n";
    }
  }
}

# Now, try to detect smart capable HDD
if ($smartctl && -x $smartctl){
  foreach my $block (Zabbix::Agent::Addons::Disks::list_smart_hdd({ skip_remouvable => 1 })){
    my @lines = qx($smartctl -A /dev/$block);
    next if ($? != 0);
    foreach my $l (@lines){
      if ($l =~ /(Temperature_Celsius|Airflow_Temperature_Cel)/){
        $sensors->{$block} = {
          description    => "$block temperature",
          threshold_low  => $def_hd_temp_thres_high-$temp_hd_hyst,
          threshold_high => $def_hd_temp_thres_high,
          type           => 'temp',
          unit           => '°C',
          cmd            => "$smartctl -A /dev/$block | grep $1 | awk '{print \$10}'"
        };
        print "Found a temperature sensor using smartctl: $block\n";
        last;
      }
      # Format found on some NVMe SSD
      elsif ($l =~ /Temperature:\s+(\d+(\.\d+)?)\sCelsius/){
        $sensors->{$block} = {
          description    => "$block temperature",
          threshold_low  => $def_hd_temp_thres_high-$temp_hd_hyst,
          threshold_high => $def_hd_temp_thres_high,
          type           => 'temp',
          unit           => '°C',
          cmd            => "$smartctl -A /dev/$block | grep Temperature: | awk '{ print \$2 }'"
        };
        print "Found a temperature sensor using smartctl: $block\n";
        last;
      }
    }
  }
  # Some LSI based hardware RAID controller can report HDD temp
  if (-e '/dev/megaraid_sas_ioctl_node'){
    # Only check for the firsts 26 drives
    foreach my $i (0..25){
      my @res = qx($smartctl -d megaraid,$i -A /dev/sda);
      next if ($? != 0);
      foreach my $l (@res){
        if ($l =~ m/Drive\sTrip\sTemperature:\s+(\d+)\s/){
          $sensors->{'sda-' . $i} = {
            description    => "Temperature for disk No $i on sda",
            type           => 'temp',
            threshold_high => $1-$temp_hd_margin,
            threshold_low  => $1-$temp_hd_margin-$temp_hd_hyst,
            unit           => '°C',
            cmd            => "$smartctl -A -d megaraid,$i /dev/sda | grep 'Current Drive Temperature' | awk '{print \$4}'"
          };
          print "Found a temperature sensor using smartctl (megaraid): sda-$i\n";
          last;
        }
        elsif ($l =~ /(Temperature_Celsius|Airflow_Temperature_Cel)/){
          $sensors->{'sda-' . $i} = {
            description    => "Temperature for disk No $i on sda",
            threshold_low  => $def_hd_temp_thres_high-$temp_hd_hyst,
            threshold_high => $def_hd_temp_thres_high,
            type           => 'temp',
            unit           => '°C',
            cmd            => "$smartctl -A -d megaraid,$i /dev/sda | grep $1 | awk '{print \$10}'"
          };
          print "Found a temperature sensor using smartctl (megaraid): sda-$i\n";
          last;
        }
      }
    }
  }
}

# Now check UPS
if ($upsc && -x $upsc){
  foreach my $ups (Zabbix::Agent::Addons::UPS::list_ups()){
    my @lines = qx($upsc $ups);
    next if ($? != 0);
    foreach my $l (@lines){
      if ($l =~ m/^ups\.temperature:\s+(\d+(\.\d+)?)/){
        $sensors->{'ups_' . lc $ups . '_temp'} = {
          description    => "ups temperature for $ups",
          type           => 'temp',
          threshold_high => $def_ups_temp_thres_high,
          threshold_low  => $def_ups_temp_thres_high-$temp_ups_hyst,
          unit           => '°C',
          cmd            => "$upsc $ups ups.temperature"
        };
        print "Found a temperature sensor for ups $ups\n";
        last;
      }
      elsif ($l =~ m/^ups\.load:\s+(\d+(\.\d+)?)/){
        $sensors->{'ups_' . lc $ups . '_load'} = {
          description    => "ups load for $ups",
          type           => 'power',
          threshold_high => $def_pwr_rel_thres_high,
          threshold_low  => $def_pwr_rel_thres_high-$pwr_rel_hyst,
          unit           => '%',
          cmd            => "$upsc $ups ups.load"
        };
      }
    }
  }
}

# TODO: add support for lm sensors, but its ouput is harder to parse
foreach my $s (sort keys %$sensors){
  $cfg->set_block($s, $sensors->{$s});
}

$cfg->write($output);

# Take a sensor description and return a suitable string as sensor ID
sub sensor_name{
  my $desc = shift;
  my $id = lc $desc;
  $id =~ s/[^\w]/_/g;
  $id =~ s/%/percent/g;
  $id =~ s/_rpm$//;
  return $id;
}