#!/usr/bin/perl
#########################################################################
#
# LOMAC - Low Water-Mark Mandatory Access Control for Linux 
# Copyright (c) 1999-2001 NAI Labs, Inc.  All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 
#   Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# 
#   Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# 
#   Neither the name of NAI Labs, Inc. nor the names of its contributors
#   may be used to endorse or promote products derived from this software
#   without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#
# testread2
#
# This script tests LOMAC's handling of the following system calls:
#    sys_read()
# This script tests the use of read when used on files.
#
# This should be run at level 2.
#
#########################################################################

use lomacpred;

$lowfilename = "/tmp/testread2lowfile";
$highfilename = "/root/testread2highfile";


#
# Ensure that LOMAC is running and that we are running at level 2.
#
&ProcAtLevelPred( 2 ) || die "ERROR: You must run this test at level 2.\n";
print( "*** Testing sys_read(file). ***\n" );

#
# create a high-level file
#
print( "Creating high-level file:\n" );
open( HIGHFILE, "> $highfilename" ) || die "can't create $highfilename: $!\n";
print HIGHFILE "garbage\n";
close HIGHFILE;
if( FileAtLevelPred( $highfilename, 2 ) ) {
    print( "\tOK.\n" );
} else {
    print( "\tFAILED.\n" );
    exit( -1 );
}

#
# create a low-level file
#
print( "Creating low-level file:\n" );
open( LOWFILE, "> $lowfilename" ) || die "can't create $lowfilename: $!\n";
print LOWFILE "garbage\n";
close LOWFILE;
if( FileAtLevelPred( $lowfilename, 1 ) ) {
    print( "\tOK.\n" );
} else {
    print( "\tFAILED.\n" );
    exit( -1 );
}
    

#
# Create a child.
#
if( $child_pid = fork ) {
    #parent

    # wait for child to exit
    $ret_val = waitpid( $child_pid, 0 );

    # clean up
    unlink( $highfilename );
    unlink( $lowfilename );

    exit( $ret_val );

} elsif( $child_pid == 0 ) {
    #child

    # Put child in its own new pgrp.
    print( "Put child in its own job:\n" );
    setpgrp( 0, $$ );                   # put child in its own pgrp
    if( ( $$ == getpgrp( 0 ) ) &&
	( &ProcAtLevelPred( 2 ) ) ) {
	print( "\tOK.\n" );
    } else {
	print( "\tFAILED.\n" );
	exit( -1 );
    }

    # test high file read - should not cause demotion.
    print( "Test read of high file:\n" );
    open( HIGHFILE, "< $highfilename" ) ||
	die "child can't open $highfilename: $!\n";
    $garbage = <HIGHFILE>;
    close( HIGHFILE );
    if( &ProcAtLevelPred( 2 ) ) {
	print( "\tOK.\n" );
    } else {
	print( "\tFAILED.\n" );
	exit( -1 );
    }

    # demote child.
    print( "Test demotion on read of low file:\n" );
    open( LOWFILE, "< $lowfilename" ) ||
	die "child can't open $lowfilename: $!\n";
    $garbage = <LOWFILE>;
    close( LOWFILE );
    if( &ProcAtLevelPred( 1 ) ) {
	print( "\tOK.\n" );
    } else {
	print( "\tFAILED.\n" );
	exit( -1 );
    }

    exit( 0 );

} else {
    die "ERROR: unable to fork\n";
}

