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#! /usr/bin/env perl

# take persistent storage created by mapSwitches.pl and dump entries

# to a tab delimited text file on STDOUT.

# v1.2 RWR 20200228

# added description field

# v3.0.0 RWR 20230325

# rewrite to use new data file format

use strict;

use warnings;

use File::Spec; # find location of script so we can put storage in same directory

use File::Basename;

use YAML::Tiny; # apt-get libyaml-tiny-perl under debian

use POSIX qw( strftime ); # to convert timestamp to something readable

use Data::Dumper; # only used for debugging

our $VERSION = '3.0.0';

# where the script is located

my $scriptDir = dirname( File::Spec->rel2abs( __FILE__ ) );

# put the statefile in there

my $STATEFILE = $scriptDir . '/mapSwitches.yaml';

# see https://perldoc.perl.org/Getopt/Long.html

use Getopt::Long;

# allow -vvn (ie, --verbose --verbose --dryrun)

Getopt::Long::Configure ("bundling");

my %switchports;

# pretty up the MAC addresses by inserting colons between

# every pair of numbers

sub prettyMAC {

   my $mac = shift;

   my @mac = ( $mac =~ m/../g );

   return join( ':', @mac );

}

# change the Unix timestamp into yyyy-mm-dd hh:mm:ss

sub prettyTime {

   my $time = shift;

   return '' unless $time;

   return strftime '%Y-%m-%d %H:%M:%S', localtime( $time );

}

sub dumpLine {

   my $delimiter = shift;

   my $encapsulate = shift;

   # read in values, defaulting to empty string if undef

   my @values = map{ $_ ? $_ : '' } @_;

   my $return;

   @values = ( map{ $encapsulate . $_ . $encapsulate } @values ) if $encapsulate;

   return join( $delimiter, @values ) . "\n";

}

# sorts by first column (switch name), second column (switch port number)

# then third column (mac address )

# NOTE: this is not csv safe; only works for tab delimited

sub sortArray {

   my @a = split( "\t", $a );

   my @b = split( "\t", $b );

   return $a[0] cmp $b[0] || $a[1] <=> $b[1] || $a[4] cmp $b[4];

}

# simple display if --help is passed

sub help {

   use File::Basename;

   print basename($0) . " $VERSION\n";

   print <<END

$0 [options]

Reads mapSwitches.yaml and emits the result as a tab delimited text file, with headers.

Output is sorted by switch name, switch port number, then mac address.

Options:

   --version        - display version and exit

   --help           - This page

END

}

# handle any command line parameters that may have been passed in

my $version = 0; # just used to determine if we should display the version

my $help = 0; # also if we want help

GetOptions (

            'help|h'        => \$help,

            'version|v'     => \$version,

            ) or die "Error parsing command line\n";

if ( $help ) { &help() ; exit; }

if ( $version ) { use File::Basename; print basename($0) . " $VERSION\n"; exit; }

# read the saved state into memory if it exists

die "no state file found, looking at $STATEFILE\n" unless -e $STATEFILE;

# get the delimiter and the encapsulation chars

my $delimiter = shift;

my $encapsulate = shift;

# default to tab delimited, no encapsulation if none entered

$delimiter = "\t" unless $delimiter;

$encapsulate = '' unless $encapsulate;

my $yaml = YAML::Tiny->read( $STATEFILE );

my $saveFile = $yaml->[0];

#print Dumper( $saveFile ); die;

# print Dumper( $saveFile->{'macList'} );

my @out;

foreach my $mac ( keys %{ $saveFile->{'macList'} } ) {

   my $switchName = $saveFile->{'switchInfo'}->{$saveFile->{'macList'}->{$mac}->{'switch'}}->{'name'};

   my $portAlias =  $saveFile->{'switchInfo'}->{$saveFile->{'macList'}->{$mac}->{'switch'}}->{'ports'}->{$saveFile->{'macList'}->{$mac}->{'port'}}->{'alias'};

   push @out, &dumpLine( 

      $delimiter, 

      $encapsulate, 

      $saveFile->{'macList'}->{$mac}->{'switch'}, 

      $saveFile->{'macList'}->{$mac}->{'port'},

      $switchName,

      $portAlias,

      &prettyMAC( $mac ),

      $saveFile->{'macList'}->{$mac}->{'ip'},

      $saveFile->{'macList'}->{$mac}->{'hostname'},

      &prettyTime( $saveFile->{'macList'}->{$mac}->{'lastseen'} )

   );

}

print &dumpLine(

   $delimiter, 

   $encapsulate, 

   'switch','port','alias','description','mac','ip','host_name','last_seen'

   );

print sort sortArray @out;

1;