#!/usr/bin/perl 
# mothership.pl
# Ted Fiedler (tfiedler@gmail.com)
# See NOTES for more info

use strict;
use warnings;
use IO::Socket::INET; 	# does network socket connections #
use POSIX qw(strftime); # time                            #
use File::Copy; 	# file copy operations            #
use Data::Dumper;	# for testing                     #
###################################################
# User configurable variables                     #
###################################################
my $path_to_ship = "/home/tfiedler/network";
my $configfile   = "mothership.cfg";

###################################################
# configuration file is here                      #
###################################################
open( CONFIGFILE, "$path_to_ship/$configfile" ) || die "$!\n";
my @information = <CONFIGFILE>;    # pull config into array

###################################################
# This file will hold _new_ status                #
###################################################
open( NEWSTATS, "> status.new" ) || die "$!\n";

###################################################
# Copy _previous_ stats to _old_ stats file       #
# for comparison                                  #
###################################################
my $copystats =
  ( -e "status.msp" )
  ? copy( "status.msp", "status.old" )
  : warn "Unable to copy status.msp to status.old $!\n";

###################################################
# iterate through each line in config and do      #
# processing here.                                #
###################################################
foreach $_ (@information) {
    chomp($_);

    # break each line into individual vars #
    my ( $hostname, $ipadd, $port, $proto, $description ) = split( /,/, $_ );

    # create a hash services with key hostname and values           #
    # $ipadd => ipaddress, $port => port number, $proto => protocol #
    my %services = ( $hostname => [ $ipadd, $port, $proto ] );
    my %status;

    # initially everything is up #
    $status{$_} = 'Up' for keys %services;
    while ( my ( $name, $svc ) = each %services ) {
        my $sock = IO::Socket::INET->new(
            Timeout  => 2,
            PeerAddr => $svc->[0],
            PeerPort => $svc->[1],
            Proto    => $svc->[2]
          )

          # or else it is down #
          or $status{$name} = 'Down';
    } # end of while statement #

    # This will be changed to reflect a correct last up and down times #
    # eventually for comparison and evaluation of total uptime         #
    # my $nowstring = strftime '%F %R', localtime;
    # my $oldtime; # for future use #
    my $nowstring = time; # in seconds #
    # this next line is EACH name (aka host) and its corresponding status #
    while ( my ( $name, $sts ) = each %status ) {

        # find out what nervice this is   #
        # man getservbyport for more info #
        my $svcwatch =
          ( $name !~ /^#/ ) ? getservbyport( $port, $proto ) : next;

	###################################################
        # pick through the data and skip anything that    #
        # doesnt qualify                                  #
	###################################################
        next unless ($hostname);
        next unless ( $ipadd =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/ );
        next unless ( $port =~ /^(\d+)/ );
        next unless ( $proto eq "udp" || $proto eq "tcp" || $proto eq "icmp" );
        unless ( $description =~ m/\w/ ) {
            $description = "No Description entered";
        } # end of unless #

        # print out the data to status.new                        #
        # this will eventually get changed to status.msp for now  #
        # I use status.new for testing                            #
        print NEWSTATS "$name,$sts,$svcwatch,$description,$nowstring\n";
        print Dumper "$name,$sts,$svcwatch,$description,$nowstring\n";
    } # End of while ( my ($name, $sts ... )
} # end of toplevel ( 1st foreach )
close(NEWSTATS);

# copy status.new to status.msp #
copy( "status.new", "status.msp" )
  || die "Unable to copy status.new to status.msp\n";

# EOF #

##</code><code>##

#Server name, IP Address, port number, protocol (tcp/udp), description (optional)
linux,127.0.0.1,22,tcp,
linux,127.0.0.1,8080,tcp,Local web server
linux,127.0.0.1,22,udp,Local SSH using udp
linux,127.0.0.1,504,tcp,Citadel server on local