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 # These constants are changed by ex/makevm
  22 use constant USER => 65534;
  23 use constant GROUP => 65534;
  24
  25 use BSD::Resource qw/setrlimit RLIMIT_AS RLIMIT_FSIZE RLIMIT_NPROC/;
  26 use IPC::Signal qw/sig_name sig_num/;
  27 use sigtrap qw/XFSZ/;
  28
  29 use Getopt::Long;
  30 use POSIX qw//;
  31 use Text::ParseWords qw/shellwords/;
  32 use Time::HiRes qw/alarm/;
  33
  34 my (@fds, $timeout, $mlimit, $olimit, $nobody);
  35 my $close = 1;
  36
  37 GetOptions(
  38         "fd=s"      => \@fds,
  39         "timeout=f" => \$timeout,
  40         "mlimit=i"  => \$mlimit,
  41         "olimit=i"  => \$olimit,
  42         "close!"    => \$close,
  43         "nobody!"   => \$nobody,
  44 );
  45
  46 my $killuser = $ENV{GRUNTMASTER_KILL_USER};
  47 my @sudo;
  48 @sudo = (shellwords ($ENV{GRUNTMASTER_SUDO}), '--') if $ENV{GRUNTMASTER_SUDO} && $nobody;
  49 undef $mlimit if @sudo; # sudo wants a lot of address space
  50
  51 my $ret = fork // die 'Cannot fork';
  52 if ($ret) {
  53         my $tle;
  54         local $SIG{ALRM} = sub {
  55                 if ($killuser) {
  56                         system @sudo, 'pkill', '-KILL', '-u', $killuser;
  57                 } else {
  58                         kill KILL => $ret
  59                 }
  60                 $tle = 1
  61         };
  62         alarm ($timeout || 5);
  63         waitpid $ret, 0;
  64         alarm 0;
  65         if (@sudo) {
  66                 $? = $? >> 8;
  67                 $? = $? < 128 || $? > 128+32 ? ($? << 8) : $? - 128;
  68         }
  69         my $sig = $? & 127;
  70         my $signame = sig_name $sig;
  71         exit !say TLE,  "\nTime Limit Exceeded"   if $tle;
  72         exit !say OLE,  "\nOutput Limit Exceeded" if $sig && $signame eq 'XFSZ';
  73         exit !say DIED, "\nCrash (SIG$signame)"   if $sig && $signame ne 'PIPE';
  74         exit !say NZX,  "\nNon-zero exit status: " . ($? >> 8) if $? >> 8;
  75         exit !say AC,   "\nAll OK";
  76 } else {
  77         $^F = 50;
  78         if ($close) {
  79                 POSIX::close $_ for 0 .. $^F;
  80         }
  81         for my $fdstring (@fds) {
  82                 my ($fd, $file) = split ' ', $fdstring, 2;
  83                 open my $fh, $file or die $!;
  84                 my $oldfd = fileno $fh;
  85                 if ($oldfd != $fd) {
  86                         POSIX::dup2 $oldfd, $fd or die $!;
  87                         POSIX::close $oldfd or die $!;
  88                 }
  89         }
  90         my $nproc = $killuser ? 15 : 1;
  91         my $debug = $ENV{TEST_VERBOSE};
  92         %ENV = (ONLINE_JUDGE => 1, PATH => $ENV{PATH}, HOME => $ENV{HOME});
  93         setrlimit RLIMIT_AS, $mlimit, $mlimit or die $! if $mlimit;
  94         setrlimit RLIMIT_FSIZE, $olimit, $olimit or die $! if $olimit;
  95         setrlimit RLIMIT_NPROC, $nproc, $nproc or die $! if $nobody;
  96         POSIX::setgid $nobody ? 65534 : USER;
  97         POSIX::setuid $nobody ? 65534 : GROUP;
  98         unshift @ARGV, @sudo;
  99         say STDERR "Executing: ", join ' ', map { "'$_'" } @ARGV if $debug;
 100         exec @ARGV;
 101 }
 102
 103 1;
 104 __END__
 105
 106 =encoding utf-8
 107
 108 =head1 NAME
 109
 110 gruntmaster-exec - Gruntmaster 6000 executor
 111
 112 =head1 SYNOPSIS
 113
 114   gruntmaster-exec 20000000 111 echo 'Hello, world!'
 115
 116 =head1 DESCRIPTION
 117
 118 gruntmaster-exec is the script used by gruntmasterd to run programs.
 119
 120 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.
 121
 122 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.
 123
 124 =head1 AUTHOR
 125
 126 Marius Gavrilescu E<lt>marius@ieval.roE<gt>
 127
 128 =head1 COPYRIGHT AND LICENSE
 129
 130 Copyright (C) 2014 by Marius Gavrilescu
 131
 132 This program is free software: you can redistribute it and/or modify
 133 it under the terms of the GNU Affero General Public License as published by
 134 the Free Software Foundation, either version 3 of the License, or
 135 (at your option) any later version.