atten.in 1.99 KB
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#!/usr/bin/perl -w

#
# Copyright (c) 2015 University of Utah and the Flux Group.
# 
# {{{EMULAB-LICENSE
# 
# This file is part of the Emulab network testbed software.
# 
# This file is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or (at
# your option) any later version.
# 
# This file 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 Affero General Public
# License for more details.
# 
# You should have received a copy of the GNU Affero General Public License
# along with this file.  If not, see <http://www.gnu.org/licenses/>.
# 
# }}}
#

use English;
use strict;
use IO::Socket::INET;

#
# Configure variables
#
my $TB			= "@prefix@";
my $RTPORT              = 0x10db; # 10 dB hex = 4315 decimal
my $SETUPPORT           = 0x11db; # 11 dB hex = 4571 decimal
my $VERSION		= 1;

#
# Turn off line buffering on output
#
$| = 1;

#
# Untaint the path
# 
$ENV{'PATH'} = "$TB/bin:$TB/sbin:/bin:/usr/bin:/sbin:/usr/sbin";
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

#
# Testbed Support libraries
#
use lib "@prefix@/lib";
use libdb;
use libtestbed;

#
# Handle command-line options.
#
sub usage() {
    print STDERR "Usage: $0 [-r] atten val\n" .
	"    where atten is the attenuator to control,\n" .
	"          val is the value (in dB) to use.\n" .
	"    if -r is specified, the request has real-time priority.\n";
    exit( 1 );
}

my $rt;

if( $ARGV[ 0 ] eq "-r" ) {
    $rt = 1;
    shift;
}

usage() unless @ARGV == 2;

my $atten = $ARGV[ 0 ];
my $val = $ARGV[ 1 ];

my $daemon = new IO::Socket::INET( PeerAddr => '127.0.0.1',
				   PeerPort => $rt ? $RTPORT : $SETUPPORT,
				   Proto => 'tcp' )
    or die "socket: $!\n";    

$daemon->write( pack( "CCC", $VERSION, $atten, $val ), 3 )
    or die "write: $!\n";

$daemon->close();

exit( 0 );