#!/bin/bash
# ////////////////////////////////////////////////////////////////////////////////
# //BOCA Online Contest Administrator
# //    Copyright (C) 2003-2012 by BOCA System (bocasystem@gmail.com)
# //
# //    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/>.
# ////////////////////////////////////////////////////////////////////////////////
#Last modified: 22/aug/2012 by cassio@ime.usp.br
#
# parameters are:
# $1 exe_file
# $2 input_file
# $3 timelimit (limit to run all the repetitions, by default only one repetition)
# $4 number_of_repetitions_to_run (optional, can be used for better tuning the timelimit)
# $5 maximum allowed memory (in MBytes)
# $6 maximum allowed output size (in KBytes)
#
# the output of the submission should be directed to the standard output
#
# the return code show what happened (according to safeexec):
# 0 ok
# 1 compile error
# 2 runtime error
# 3 timelimit exceeded
# 4 internal error
# 5 parameter error
# 6 internal error
# 7 memory limit exceeded
# 8 security threat
# 9 runtime error
# other_codes are unknown to boca: in this case BOCA will present the
#                                  last line of standard output to the judge

umask 0022
id -u bocajail >/dev/null 2>/dev/null
if [ $? == 0 ]; then
	bocau=`id -u bocajail`
	bocag=`id -g bocajail`
	chown bocajail.nogroup .
else
	bocau=`id -u nobody`
	bocag=`id -g nobody`
	chown nobody.nogroup .
fi
if [ "$bocau" == "" -o "$bocag" == "" ]; then
	echo "error finding user to run script"
	exit 43
fi

# this script makes use of safeexec to execute the code with less privilegies
# make sure that directories below are correct.
sf=`which safeexec`
[ -x "$sf" ] || sf=/usr/bin/safeexec

if [ "$1" == "" -o "$2" == "" -o "$3" == "" ]; then
    echo "parameter problem"
    exit 43
fi
if [ ! -x "$1" ]; then
    echo "$1 not found (or is not in the current dir) or it's not executable"
    exit 44
fi
if [ ! -r "$2" ]; then
    echo "$2 not found (or is not in the current dir) or it's not readable"
    exit 45
fi
if [ ! -x $sf ]; then
    echo "$sf not found or it's not executable"
    exit 46
fi

time=$3
if [ "$time" -gt "0" ]; then
  let "ttime = $time + 30"
else
  time=1
  ttime=30
fi

nruns=1
if [ "$4" != "" ]; then
  if [ "$4" -gt "0" ]; then
    nruns=$4
  fi
fi
maxm=512000
if [ "$5" != "" ]; then
  if [ "$5" -gt "0" ]; then
    maxm=${5}000
  fi
fi
maxf=1024
if [ "$6" != "" ]; then
  if [ "$6" -gt "0" ]; then
    maxf=${6}
  fi
fi

cp "$2" stdin0 2>/dev/null
cp "$1" run.exe 2>/dev/null

file run.exe | grep -iq "statically linked"
if [ "$?" != "0" ]; then
  echo "Aborting because $1 is not statically linked"
  exit 47
fi

cdir=`pwd`
echo "Current directory is $cdir -- chrooting on it" >&2
$sf -F10 -f$maxf -r$nruns -n1 -R$cdir -C. -U$bocau -G$bocag -ostdout0 -estderr0 -d$maxm -m$maxm -t$time -T$ttime -istdin0 ./run.exe
ret=$?
if [ $ret -gt 10 ]; then
	ret=0
fi
if [ -f stdout0 ]; then
  cat stdout0
fi
exit $ret