#!/usr/bin/env perl
use warnings;
use strict;  

use version ; our $VERSION = 'v1.2.0';

# BSD network module for sysinfo client
# Author: R. W. Rodolico
# Date:   2016-04-08
#
# module to get network interface information for BSD systems
# assumes ifconfig is on the system and executable by the user
# NOTE: this takes the ifconfig output and parses it, so changes to 
#       this output invalidates this module
#
# Revision History
#
#

# find our location and use it for searching for libraries. library.pm must be in the same directory as the calling script
# or, if run interactively, in the parent of the modules
BEGIN {
   use FindBin;
   use File::Spec;
   # prepend the bin directory and its parent
   use lib File::Spec->catdir($FindBin::Bin), File::Spec->catdir("$FindBin::Bin/..");
   eval( 'use library;' );
   die sprintf( "Could not find library.pm in %s, INC is %s\n", __FILE__, join( "\n", @INC ) ) if $@;
}

#####
##### Change these to match your needs
#####

# Make this a list of all the modules we are going to use. You can replace undef with the version you need, if you like
my $modulesList = {
        'Data::Dumper'     => undef,
   };

# hash of commands that are needed for the system. key is the name of the command and, in some cases, the value will become
# the full path (from which or where)
my $commandsList = {
        'ifconfig' => undef,
   };

# list of operating systems this module can be used on.
my $osList = {
#         'mswin32' => undef,
         'freebsd' => undef,
#         'linux'   => undef,
   };

# the category the return data should go into. See sysinfo for a list
my $CATEGORY = 'network';

#####
##### End of required
#####

# some variables needed for our system
my $errorPrepend = 'error: in ' . __FILE__; # this is prepended to any error messages
my @out; # temporary location for each line of output

# Try to load the modules we need. If we can not, then make a list of missing modules for error message.
for my $module ( keys %$modulesList ) {
   eval ( "use $module;" );
   push @out, "$errorPrepend Could not load $module" if $@;
}

if ( ! @out && ! checkOS ( $osList ) ) { # check if we are on an acceptible operating system
    push @out, "$errorPrepend Invalid Operating System";
}
if ( !@out && ! validCommandOnSystem ( $commandsList ) ) {
   push @out, "$errorPrepend Can not find some commands needed";
}
if ( !@out ) { # we made it, we have everything, so do the processing
   #####
   ##### Your code starts here. Remember to push all output onto @out
   #####
   
   # xn0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
   # ether 00:16:3e:ff:ff:04
   my $regexHWADDR = 'ether\s+([0-9a-f:]+)';
   # inet 74.113.60.189 netmask 0xffffffc0 broadcast 74.113.60.191
   my $regexINET = 'inet\s*([0-9.]+)[^0-9].*netmask 0x([0-9a-z]+)';
   # inet6 addr: fe80::216:3eff:fe1f:ef4f/64 Scope:Link
   my $regexINET6 = 'inet6\s*([0-9a-f:]+).*prefixlen\s*(\d+)';
   # UP LOOPBACK RUNNING  MTU:16436  Metric:1
   my $regexMTU = 'mtu\s([0-9]+)';
   my $temp = qx( ifconfig );
   my @temp = split( "\n", $temp );
#   die Dumper( \@temp );
   my $currentIF;
   while ( @temp ) {
      my $line = shift @temp;
      next unless $line;
      if ( $line =~ m/^([^ ]+):/) { # if the first character is not a space, starting new entry
         $currentIF = $1;
         if ( $line =~ m/$regexMTU/i ) {
            push @out,  "$CATEGORY\t$currentIF\tmtu\t$1";
         }
      } elsif ( $line =~ m/$regexHWADDR/i ) {
         push @out,  "$CATEGORY\t$currentIF\tmac\t$1";
      } elsif ( $line =~ m/$regexINET/i ) {
         push @out,  "$CATEGORY\t$currentIF\taddress\t$1";
         push @out,  "$CATEGORY\t$currentIF\tnetmask\t$2";
      } elsif ( $line =~ m/$regexINET6/i )  {
         push @out,  "$CATEGORY\t$currentIF\tip6address\t$1";
         push @out,  "$CATEGORY\t$currentIF\tip6networkbits\t$2";
      } elsif ( $line =~ m/$regexMTU/i )  {
         push @out,  "$CATEGORY\t$currentIF\tmtu\t$1";
      }
   }
   
   #####
   ##### Your code ends here.
   #####
}

# If we are testing from the command line (caller is undef), print the results for debugging
print join( "\n", @out ) . "\n" unless caller;
# called by do, which has a value of the last assignment made, so make the assignment. The equivilent of a return
my $return = join( "\n", @out );