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           rodolico | 
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           #!/usr/bin/env perl
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           use warnings;
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           use strict;  
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           # Description: Networking for Unix systems
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           our $VERSION = '1.2';
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           # Linux network module for sysinfo client
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           # Author: R. W. Rodolico
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           # Date:   2016-04-08
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           # module to get network interface information for Linux systems
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           # assumes ifconfig is on the system and executable by the user
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           # NOTE: this takes the ifconfig output and parses it, so changes to 
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           #       this output invalidates this module
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           BEGIN {
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              push @INC, shift;
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           }
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           use library;
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           exit 1 unless &getOperatingSystem() =~ m/bsd/i;
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           my $command = &validCommandOnSystem('/sbin/ifconfig');
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           exit 1 unless $command;
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           my $CATEGORY = 'network';
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           # xn0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
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           # ether 00:16:3e:ff:ff:04
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           my $regexHWADDR = 'ether\s+([0-9a-f:]+)';
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           # inet 74.113.60.189 netmask 0xffffffc0 broadcast 74.113.60.191
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           my $regexINET = 'inet\s*([0-9.]+)[^0-9].*netmask 0x([0-9a-z]+)';
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           # inet6 addr: fe80::216:3eff:fe1f:ef4f/64 Scope:Link
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           my $regexINET6 = 'inet6\s*([0-9a-f:]+).*prefixlen\s*(\d+)';
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           # UP LOOPBACK RUNNING  MTU:16436  Metric:1
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           my $regexMTU = 'mtu\s([0-9]+)';
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           my $temp = qx/$command/;
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           my @temp = split( "\n", $temp );
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           my $currentIF;
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           while ( @temp ) {
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              my $line = shift @temp;
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              next unless $line;
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              if ( $line =~ m/^([^ ]+):/) { # if the first character is not a space, starting new entry
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                 $currentIF = $1;
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                 if ( $line =~ m/$regexMTU/i ) {
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                    print "$CATEGORY\t$currentIF\tmtu\t$1\n";
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                 }
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              } elsif ( $line =~ m/$regexHWADDR/i ) {
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                 print "$CATEGORY\t$currentIF\tmac\t$1\n";
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              } elsif ( $line =~ m/$regexINET/i ) {
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                 print "$CATEGORY\t$currentIF\taddress\t$1\n";
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                 print "$CATEGORY\t$currentIF\tnetmask\t$2\n";
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              } elsif ( $line =~ m/$regexINET6/i )  {
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                 print "$CATEGORY\t$currentIF\tip6address\t$1\n";
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                 print "$CATEGORY\t$currentIF\tip6networkbits\t$2\n";
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              } elsif ( $line =~ m/$regexMTU/i )  {
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                 print "$CATEGORY\t$currentIF\tmtu\t$1\n";
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              }
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           }
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