#!/usr/bin/perl
###############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2007-2021  IPFire Twan  <info@ipfire.org>                     #
#                                                                             #
# This program is free software: you can redistribute it and/or modify        #
# it under the terms of the GNU General Public License as published by        #
# the Free Software Foundation, either version 3 of the License, or           #
# (at your option) any later version.                                         #
#                                                                             #
# This program is distributed in the hope that it will be useful,             #
# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
# GNU General Public License for more details.                                #
#                                                                             #
# You should have received a copy of the GNU General Public License           #
# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
#                                                                             #
###############################################################################

###############################################################################
# functions copied from general-functions.pl for speed improvement because    #
# loading and initializing the whole general-functions.pl every second create #
# high system load                                                            #
###########################################OA##################################
#
# Function which will return the used interface for the red network zone (red0, ppp0, etc).
sub General__get_red_interface() {

     open(IFACE, "/var/ipfire/red/iface") or die "Could not open /var/ipfire/red/iface";

     my $interface = <IFACE>;
     close(IFACE);
     chomp $interface;

     return $interface;
}
#
###############################################################################

my $data_last = $ENV{'QUERY_STRING'};
my $rxb_last = 0;
my $txb_last = 0;

my (@fields, $field, $name, $value);
@fields = split(/&/, $data_last);
foreach $field (@fields) {
  ($name, $value) = split(/=/, $field);
  $value =~ tr/+/ /;
  $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
  if ("$name" eq "rxb_last") {
		$rxb_last = $value;
	} elsif ("$name" eq "txb_last") {
		$txb_last = $value;
	}
}

my $interface = &General__get_red_interface();

open(RX, "/sys/class/net/$interface/statistics/rx_bytes") or die "Could not open /sys/class/net/$interface/statistics/rx_bytes";
my $rxb_now = <RX>;
close(RX);
chomp $rxb_now;

open(TX, "/sys/class/net/$interface/statistics/tx_bytes") or die "Could not open /sys/class/net/$interface/statistics/tx_bytes";
my $txb_now = <TX>;
close(TX);
chomp $txb_now;

my ($rx_kbs, $tx_kbs);
my $rxb_diff	= $rxb_now - $rxb_last;
my $txb_diff	= $txb_now - $txb_last;

if(( $rxb_diff == $rxb_now ) && ( $txb_diff == $txb_now ))
{
	$rx_kbs	= "0";
	$tx_kbs	= "0";
}
else
{
	$rx_kbs = $rxb_diff / 1024;
	$rx_kbs = $rx_kbs / 3.2;
	$rx_kbs = int($rx_kbs);
	$tx_kbs = $txb_diff / 1024;
	$tx_kbs = $tx_kbs / 3.2;
	$tx_kbs = int($tx_kbs);
}

print "pragma: no-cache\n";
print "Content-type: text/xml\n\n";
print "<?xml version=\"1.0\"?>\n";
print <<END
<inetinfo>
 <rx_kbs>$tx_kbs kb/s</rx_kbs>
 <tx_kbs>$rx_kbs kb/s</tx_kbs>
 <rxb>$rxb_now</rxb>
 <txb>$txb_now</txb>
</inetinfo>
END
;