Added plugin for received firewall packets

.gitignore

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+# End of https://www.gitignore.io/api/sublimetext,perl

README.md

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+# munin-ipv6 - A collection of Munin plugins made IPv6-capable
+
+This is just a collection of munin plugins, modified to properly work in an IPv6-enabled or IPv6-only environment. Sadly, many older plugins are only measuring IPv4 traffic.
+
+## fw_packets_ds
+
+Adaption of the original fw_packets plugin for IPv6.

fw_packets_ds

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+#!/usr/bin/perl -w
+
+=head1 NAME
+
+fw_packets_ds - Plugin to monitor the throughput of a firewall in an
+IPv4/IPv6 DualStack setup
+
+=head1 CONFIGURATION
+
+This plugin must run with root privileges
+
+=head1 CONFIGURATION EXAMPLE
+
+/etc/munin/plugin-conf.d/global or other file in that dir must contain:
+
+ [fw*]
+  user root
+
+=head1 NOTES
+
+This plugin is insprired by the original fw_packets plugin.
+
+The plugin tries to use the nstat tool to determine the metrics in
+a more consistent way. If this fails it falls back to parsing
+/proc files.
+
+=head1 AUTHOR
+
+Nis 'eNBeWe' Wechselberg
+
+=head1 LICENSE
+
+MIT
+
+=head1 MAGIC MARKERS
+
+ #%# family=auto
+ #%# capabilities=autoconf
+
+=cut
+
+use strict;
+
+my $nstat = '/usr/bin/nstat';
+my $snmp_file = '/proc/net/snmp';
+my $snmp6_file = '/proc/net/snmp6';
+
+# Autoconf Mode
+if ( defined($ARGV[0]) and $ARGV[0] eq "autoconf" ) {
+  if ( -x $nstat or -r $snmp_file or -r $snmp6_file ) {
+    print "yes\n";
+  } else {
+    print "no\n";
+  }
+  exit 0;
+}
+
+# Graph config
+if ( defined($ARGV[0]) and $ARGV[0] eq "config" ) {
+  print <<EOF;
+graph_title Firewall Throughput
+graph_args --base 1000 -l 0
+graph_vlabel Packets/\${graph_period}
+graph_category network
+v4_received.label IPv4 Received
+v4_received.draw AREA
+v4_received.type DERIVE
+v4_received.min 0
+v6_received.label IPv6 Received
+v6_received.draw STACK
+v6_received.type DERIVE
+v6_received.min 0
+EOF
+  exit 0;
+}
+
+my %state = (
+  'v4RECEIVED' => 0,
+  'v6RECEIVED' => 0
+);
+
+if ( -x $nstat ) {
+  # Use nstat tool for metrics
+  my $command = "$nstat -a -z IpIn* Ip6In* 2>/dev/null";
+
+  open CMD, "$command|";
+  while (<CMD>) {
+    if (/^(\S+)\s+(\d+)/) {
+      if ( $1 eq 'IpInReceives' ) {
+        $state{'v4RECEIVED'} = $2;
+      }
+      if ( $1 eq 'Ip6InReceives' ) {
+        $state{'v6RECEIVED'} = $2;
+      }
+    }
+  }
+  close CMD;
+} else {
+  # Parse /proc files
+  if ( -r $snmp_file ) {
+    my $index_received = 0;
+    open SNMP, $snmp_file;
+    while (<SNMP>) {
+      if (/^Ip:\s+\D/) {
+        my @ip = split;
+        while ( not $ip[$index_received] =~ /InReceives/ ) {
+          $index_received++;
+        }
+      }
+      if (/^Ip:\s+\d/) {
+        my @ip = split;
+        $state{'v4RECEIVED'} = $ip[$index_received];
+        last;
+      }
+    }
+    close SNMP;
+  }
+
+  if ( -r $snmp6_file ) {
+    open SNMP6, $snmp6_file;
+    while (<SNMP6>) {
+      if (/^Ip6InReceives\s+(\d+)/) {
+        $state{'v6RECEIVED'} = $1;
+      }
+    }
+    close SNMP6;
+  }
+}
+
+print "v4_received.value $state{'v4RECEIVED'}\n";
+print "v6_received.value $state{'v6RECEIVED'}\n";