########################################################
# Please file all bug reports, patches, and feature
# requests under:
#      https://sourceforge.net/p/logwatch/_list/tickets
# Help requests and discusion can be filed under:
#      https://sourceforge.net/p/logwatch/discussion/
########################################################

#####################################################
## Copyright (c) 2008 Kirk Bauer
## Covered under the included MIT/X-Consortium License:
##    http://www.opensource.org/licenses/mit-license.php
## All modifications and contributions by other persons to
## this script are assumed to have been donated to the
## Logwatch project and thus assume the above copyright
## and licensing terms.  If you want to make contributions
## under your own copyright or a different license this
## must be explicitly stated in the contribution an the
## Logwatch project reserves the right to not accept such
## contributions.  If you have made significant
## contributions to this script and want to claim
## copyright please contact logwatch-devel@lists.sourceforge.net.
#########################################################

use strict;
use Logwatch ':ip';

my $Detail = $ENV{'LOGWATCH_DETAIL_LEVEL'} || 0;
my $Ignore_cpu_throttled = $ENV{'ignore_cpu_throttled'} || 0;
my $Ignore_faults = $ENV{'ignore_faults'};
my $Ignore_rpcsec_expired = $ENV{'ignore_rpcsec_expired'} || 0;
my $Ignore_messages = $ENV{'kernel_ignore_messages'} || '^$';
my $CPUThrottled = 0;
my %SYNflood = ();
my %RAIDErrors = ();
my %DRBDErrors = ();
my %SegFaults = ();
my %GPFaults = ();
my %TrapInt3s = ();
my %UnalignedErrors = ();
my %FPAssists = ();
my %OOM = ();
my %Errors = ();
my %Kernel = ();
my %EDACs = ();
my %NFS = ();
my %EXT4Volume = ();
my %EXT4 = ();

#Init String Containers
my (
$Volume,    $errormsg,  $from,
$host,      $on
);
while (defined(my $ThisLine = <STDIN>)) {
   chomp($ThisLine);
   next if ($ThisLine eq '');
   # Remove timestamp if present
   $ThisLine =~ s/^\[\s*\d+\.\d+\]\s*//;

   if (
      # filter out audit messages - these should be parsed by the audit
      # service
      ($ThisLine =~ /(type=\d+\s+)?audit\(/)
      # following now in iptables service
      or ($ThisLine =~ /^Packet log: .*PROTO=/)
      or ($ThisLine =~ /IN=.*OUT=.*SRC=.*DST=.*PROTO=/)
      or ($ThisLine =~ /RAS: Correctable Errors collector initialized/)
      # user specified ignore messages, lower cased
      or ($ThisLine =~ /$Ignore_messages/i)
      ) { # ignore the above strings
   } elsif ( ($from,$on) = ( $ThisLine =~ /^Warning: possible SYN flood from ([^ ]+) on ([^ ]+):.+ Sending cookies/ ) ) {
      my $Fullfrom = LookupIP($from);
      my $Fullon = LookupIP($on);
      $SYNflood{$Fullon}{$Fullfrom}++;
   } elsif ($ThisLine =~ /temperature above threshold, cpu clock throttled/) {
      $CPUThrottled++ if not $Ignore_cpu_throttled;
   } elsif ($ThisLine =~ /continuing in degraded mode/) {
      $RAIDErrors{$ThisLine}++;
   } elsif ($ThisLine =~ /([^(]*)\[\d+\]: segfault at/) {
      $SegFaults{$1}++;
   } elsif ($ThisLine =~ /([^(]*)\[\d+\] general protection/) {
      $GPFaults{$1}++;
   } elsif ($ThisLine =~ /([^(]*)\[\d+\] trap int3 /) {
      $TrapInt3s{$1}++;
   } elsif ($ThisLine =~ /([^(]*)\(\d+\): unaligned access to/) {
      $UnalignedErrors{$1}++;
   } elsif ($ThisLine =~ /([^(]*)\(\d+\): floating-point assist fault at ip/) {
      $FPAssists{$1}++;
   } elsif ($ThisLine =~ /(?:[Kk]illed|[Kk]ill) process \d+ \((.*)\)/) {
      $OOM{$1}++;
   } elsif ($ThisLine =~ /(EDAC (?:igen6 )?(?:MC|PCI)\d:.*)/) {
      # Standard boot messages
      next if $ThisLine =~ /(?:Giving out device to |HANDLING IBECC MEMEORY )/;
      $EDACs{$1}++;
   } elsif ($ThisLine =~ /(block drbd\d+): Online verify found (\d+) \d+k block out of sync/) {
      $DRBDErrors{$1}{"$2 block(s) out of sync"} = 1;
   } elsif ($ThisLine =~ /(block drbd\d+): \[.*\] sock_sendmsg time expired/) {
      $DRBDErrors{$1}{"sock_sendmsg time expired"}++;
   } elsif ($ThisLine =~ /(block drbd\d+): Began resync as (SyncSource|SyncTarget)/) {
      $DRBDErrors{$1}{"Began resync as $2"}++;
   } elsif ( $ThisLine =~ /raid.*CRIT/) {
      # kernel: megaraid_sas 0000:88:00.0: 781934 (727946738s/0x0004/CRIT) - Enclosure PD 08(c Port 0 - 3/p1) phy bad for slot 19
      # de-dupe
      $ThisLine =~ s/: \d+ /: /;
      $ThisLine =~ s/\(\d+s\//(Xs\//;
      $Errors{$ThisLine}++;
   } elsif ( ( $errormsg ) = ( $ThisLine =~ /(.*?error.{0,17})/i ) ) {
      # filter out smb open/read errors cased by insufficient permissions
      my $SkipError = 0;
      $SkipError = 1 if $ThisLine =~ /smb_readpage_sync: .*open failed, error=-13/;
      $SkipError = 1 if $ThisLine =~ /smb_open: .* open failed, result=-13/;
      $SkipError = 1 if $ThisLine =~ /smb_open: .* open failed, error=-13/;
      # filter out error_exit in stack traces caused by OOM conditions
      $SkipError = 1 if $ThisLine =~ /\[<[\da-f]+>\] error_exit\+0x/;
      # These are informative, not errors
      $SkipError = 1 if $ThisLine =~ /ACPI _OSC request failed \(AE_ERROR\), returned control mask: 0x1d/;
      $SkipError = 1 if $ThisLine =~ /ERST: Error Record Serialization Table \(ERST\) support is initialized/;
      $SkipError = 1 if $ThisLine =~ /GHES: Generic hardware error source: \d+ notified via .* is not supported/;
      $SkipError = 1 if $ThisLine =~ /HEST: Enabling Firmware First mode for corrected errors/;
      $SkipError = 1 if $ThisLine =~ /PCIe errors handled by (?:BIOS|OS)/;
      # These happen when kerberos tickets expire, which can be normal
      $SkipError = 1 if $ThisLine =~ /Error: state manager encountered RPCSEC_GSS session expired against NFSv4 server/ && $Ignore_rpcsec_expired;
      $SkipError = 1 if $ThisLine =~ /RAS: Correctable Errors collector initialized/;
      # filter out mount options
      $SkipError = 1 if $ThisLine =~ /errors=(?:continue|remount-ro|panic)/;
      $Errors{$errormsg}++ if ( (! $SkipError) || ($Detail > 8));
   } elsif ( ( ($Volume, $errormsg) ) = ( $ThisLine =~ /^EXT4-fs \(([^)]+)\): (.*)/ ) ) {
      if ($errormsg =~ /INFO: recovery required on readonly filesystem/) {
         $EXT4Volume{$Volume} = 1;
         push @{$EXT4{$Volume}}, $errormsg;
      } elsif ($EXT4Volume{$Volume}) {
         push @{$EXT4{$Volume}}, $errormsg if $EXT4{$Volume};
         delete $EXT4Volume{$Volume} if ($errormsg =~ /recovery complete/);
      }
   } elsif ( ( $errormsg ) = ( $ThisLine =~ /((BUG|WARNING|INFO):.{0,40})/ ) ) {
      $Errors{$errormsg}++;
   } elsif ( ( $host ) = ( $ThisLine =~ /^nfs: server (.*) not responding/ ) ) {
      $NFS{$host}++;
   # OTHER
   } else {
      # XXX For now, going to ignore all other kernel messages as there
      # XXX are practically an infinite number and most of them are obviously
      # XXX not parsed here at this time.
      # filter out smb open/read errors cased by insufficient permissions
      my $SkipError = 0;
      $SkipError = 1 if $ThisLine =~ /smb_readpage_sync: .*open failed, error=-13/;
      $SkipError = 1 if $ThisLine =~ /smb_open: .* open failed, result=-13/;
      $SkipError = 1 if $ThisLine =~ /smb_open: .* open failed, error=-13/;
      $SkipError = 1 if $ThisLine =~ /block drbd\d+: Out of sync: start=\d+/;
      $SkipError = 1 if $ThisLine =~ /block drbd\d+: updated( sync)? UUIDs?/i;
      $SkipError = 1 if $ThisLine =~ /block drbd\d+: Resync done/;
      $SkipError = 1 if $ThisLine =~ /block drbd\d+: cs:(?:Ahead|Behind) rs_left/;
      $SkipError = 1 if $ThisLine =~ /block drbd\d+: \d+ % had equal checksums, eliminated:/;
      $Kernel{$ThisLine}++ if ( (! $SkipError) || ($Detail > 8)) ;
   }
}

if (keys %SYNflood) {
   print "\nWarning: SYN flood on:\n";
   foreach my $Thisone (sort {$a cmp $b} keys %SYNflood) {
      print "   " . $Thisone . " from:\n";
      foreach my $Next (sort {$a cmp $b} keys %{$SYNflood{$Thisone}}) {
         print "      " . $Next . ": $SYNflood{$Thisone}{$Next} Time(s)\n";
      }
   }
}

if (keys %RAIDErrors) {
   print "\nWARNING:  RAID Errors Present\n";
   foreach my $Thisone ( sort {$a cmp $b} keys %RAIDErrors ) {
      print "   $Thisone ...:  $RAIDErrors{$Thisone} Time(s)\n";
   }
}

if (keys %DRBDErrors) {
   print "\nWARNING:  DRBD Errors Present\n";
   foreach my $Thisone ( sort {$a cmp $b} keys %DRBDErrors ) {
      foreach my $Msg (sort {$a cmp $b} keys %{$DRBDErrors{$Thisone}}) {
         print "   $Thisone: $Msg";
         print " :  $DRBDErrors{$Thisone}{$Msg} Time(s)" if $DRBDErrors{$Thisone}{$Msg} > 1;
         print "\n";
      }
   }
}

if (keys %SegFaults) {
   my $header_printed=0;
   foreach my $Thisone ( sort {$a cmp $b} keys %SegFaults ) {
      if ($Thisone =~ /^$Ignore_faults$/) { next; }
      if (!$header_printed) {
         print "\nWARNING:  Segmentation Faults in these executables\n";
         $header_printed=1;
      }
      print "   $Thisone :  $SegFaults{$Thisone} Time(s)\n";
   }
}

if (keys %GPFaults) {
   my $header_printed=0;
   foreach my $Thisone ( sort {$a cmp $b} keys %GPFaults ) {
      if ($Thisone =~ /^$Ignore_faults$/) { next; }
      if (!$header_printed) {
         print "\nWARNING:  General Protection Faults in these executables\n";
         $header_printed=1;
      }
      print "   $Thisone :  $GPFaults{$Thisone} Time(s)\n";
   }
}

if (keys %TrapInt3s) {
   my $header_printed=0;
   foreach my $Thisone ( sort {$a cmp $b} keys %TrapInt3s ) {
      if ($Ignore_faults =~ /\b\Q$Thisone\E\b/i) { next; }
      if (!$header_printed) {
         print "\nWARNING:  Trap int3 in these executables\n";
         $header_printed=1;
      }
      print "   $Thisone :  $TrapInt3s{$Thisone} Time(s)\n";
   }
}

if (keys %UnalignedErrors) {
   print "\nWARNING:  Unaligned Errors in these executables\n";
   foreach my $Thisone ( sort {$a cmp $b} keys %UnalignedErrors ) {
      print "   $Thisone :  $UnalignedErrors{$Thisone} Time(s)\n";
   }
}

if (keys %FPAssists) {
   print "\nWARNING:  Floating-Point Assists in these executables\n";
   foreach my $Thisone ( sort {$a cmp $b} keys %FPAssists ) {
      print "   $Thisone :  $FPAssists{$Thisone} Time(s)\n";
   }
}

if (keys %OOM) {
   print "\nWARNING:  Out of memory killer killed these executables\n";
   foreach my $Thisone ( sort {$a cmp $b} keys %OOM ) {
      print "   $Thisone :  $OOM{$Thisone} Time(s)\n";
   }
}

if (keys %Errors) {
   print "\nWARNING:  Kernel Errors Present\n";
   foreach my $Thisone ( sort {$a cmp $b} keys %Errors ) {
      print "   $Thisone ...:  $Errors{$Thisone} Time(s)\n";
   }
}

if (keys %EDACs) {
   print "\nWARNING:  Kernel EDAC Messages\n";
   foreach my $Thisone ( sort {$a cmp $b} keys %EDACs ) {
      print "   $Thisone ...:  $EDACs{$Thisone} Time(s)\n";
   }
}

if (keys %NFS) {
   print "\nWARNING:  NFS Server Not Responding Messages\n";
   foreach my $Thisone ( sort {$a cmp $b} keys %NFS ) {
      print "   $Thisone ...:  $NFS{$Thisone} Time(s)\n";
   }
}

if (keys %EXT4) {
   print "\nWARNING:  Ext4 Errors Present\n";
   foreach my $Volume ( sort {$a cmp $b} keys %EXT4 ) {
      print "   $Volume:\n";
      foreach my $Msg (@{$EXT4{$Volume}}) {
         print "      $Msg\n";
      }
   }
}

if ($CPUThrottled) {
   print "\nWARNING:  CPU Package temperature above threshold, cpu clock throttled $CPUThrottled Time(s)\n";
}

# OTHER
if ( ($Detail >= 5) and (keys %Kernel) ) {
   print "\n";
   foreach my $Thisone (sort {$a cmp $b} keys %Kernel) {
      print $Kernel{$Thisone} . " Time(s): " . $Thisone . "\n";
   }
}

exit(0);

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