gruntmaster-exec

   1 #!/usr/bin/perl
   2 use v5.14;
   3 use strict;
   4 use warnings;
   5
   6 use constant +{
   7         # Accepted
   8         AC => 0,
   9
  10         # Internal server error
  11         ERR => -1,
  12
  13         # All other errors
  14         WA => 1,
  15         NZX => 2,
  16         TLE => 3,
  17         OLE => 4,
  18         DIED => 5,
  19         REJ => 10,
  20 };
  21
  22 use BSD::Resource qw/setrlimit RLIMIT_AS RLIMIT_FSIZE RLIMIT_NPROC/;
  23 use IPC::Signal qw/sig_name sig_num/;
  24 use sigtrap qw/XFSZ/;
  25
  26 use Getopt::Long;
  27 use POSIX qw//;
  28 use Text::ParseWords qw/shellwords/;
  29 use Time::HiRes qw/alarm/;
  30
  31 my (@fds, $timeout, $mlimit, $olimit, $sudo);
  32 my $close = 1;
  33
  34 GetOptions(
  35         "fd=s"      => \@fds,
  36         "timeout=f" => \$timeout,
  37         "mlimit=i"  => \$mlimit,
  38         "olimit=i"  => \$olimit,
  39         "close!"    => \$close,
  40         "sudo!"   => \$sudo,
  41 );
  42
  43 my $killuser = $ENV{GRUNTMASTER_KILL_USER};
  44 my @sudo;
  45 @sudo = (shellwords ($ENV{GRUNTMASTER_SUDO}), '--') if $ENV{GRUNTMASTER_SUDO} && $sudo;
  46 undef $mlimit if @sudo; # sudo wants a lot of address space
  47
  48 my $ret = fork // die 'Cannot fork';
  49 if ($ret) {
  50         my $tle;
  51         local $SIG{ALRM} = sub {
  52                 if ($killuser) {
  53                         system @sudo, 'pkill', '-KILL', '-u', $killuser;
  54                 } else {
  55                         kill KILL => $ret
  56                 }
  57                 $tle = 1
  58         };
  59         alarm ($timeout || 10);
  60         waitpid $ret, 0;
  61         alarm 0;
  62         if (@sudo) {
  63                 $? = $? >> 8;
  64                 $? = $? < 128 || $? > 128+32 ? ($? << 8) : $? - 128;
  65         }
  66         my $sig = $? & 127;
  67         my $signame = sig_name $sig;
  68         exit !say TLE,  "\nTime Limit Exceeded"   if $tle;
  69         exit !say OLE,  "\nOutput Limit Exceeded" if $sig && $signame eq 'XFSZ';
  70         exit !say DIED, "\nCrash (SIG$signame)"   if $sig && $signame ne 'PIPE';
  71         exit !say NZX,  "\nNon-zero exit status: " . ($? >> 8) if $? >> 8;
  72         exit !say AC,   "\nAll OK";
  73 } else {
  74         $^F = 50;
  75         if ($close) {
  76                 POSIX::close $_ for 0 .. $^F;
  77         }
  78         for my $fdstring (@fds) {
  79                 my ($fd, $file) = split ' ', $fdstring, 2;
  80                 open my $fh, $file or die $!;
  81                 my $oldfd = fileno $fh;
  82                 if ($oldfd != $fd) {
  83                         POSIX::dup2 $oldfd, $fd or die $!;
  84                         POSIX::close $oldfd or die $!;
  85                 }
  86         }
  87         my $nproc = $killuser ? 15 : 1;
  88         my $debug = $ENV{TEST_VERBOSE};
  89         %ENV = (ONLINE_JUDGE => 1, PATH => $ENV{PATH}, HOME => $ENV{HOME});
  90         setrlimit RLIMIT_AS, $mlimit, $mlimit or die $! if $mlimit;
  91         setrlimit RLIMIT_FSIZE, $olimit, $olimit or die $! if $olimit;
  92         setrlimit RLIMIT_NPROC, $nproc, $nproc or die $! if $sudo;
  93         unshift @ARGV, @sudo;
  94         say STDERR "Executing: ", join ' ', map { "'$_'" } @ARGV if $debug;
  95         exec @ARGV;
  96 }
  97
  98 1;
  99 __END__
 100
 101 =encoding utf-8
 102
 103 =head1 NAME
 104
 105 gruntmaster-exec - Gruntmaster 6000 executor
 106
 107 =head1 SYNOPSIS
 108
 109   gruntmaster-exec 20000000 111 echo 'Hello, world!'
 110
 111 =head1 DESCRIPTION
 112
 113 gruntmaster-exec is the script used by gruntmasterd to run programs.
 114
 115 The first argument is the address space limit (in bytes), the second argument is the output limit (also in bytes). The rest of the arguments are the command that should be run and its arguments.
 116
 117 gruntmaster-exec sets the resource limits, cleans the environment (except for PATH and HOME), adds the ONLINE_JUDGE environment variable with value 1, and finally C<exec>s the given command.
 118
 119 =head1 AUTHOR
 120
 121 Marius Gavrilescu E<lt>marius@ieval.roE<gt>
 122
 123 =head1 COPYRIGHT AND LICENSE
 124
 125 Copyright (C) 2014 by Marius Gavrilescu
 126
 127 This program is free software: you can redistribute it and/or modify
 128 it under the terms of the GNU Affero General Public License as published by
 129 the Free Software Foundation, either version 3 of the License, or
 130 (at your option) any later version.