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, $keep_stderr);
  32
  33 GetOptions(
  34         "fd=s"         => \@fds,
  35         "timeout=f"    => \$timeout,
  36         "mlimit=i"     => \$mlimit,
  37         "olimit=i"     => \$olimit,
  38         "keep-stderr!" => \$keep_stderr,
  39         "sudo!"        => \$sudo,
  40 );
  41
  42 my $killuser = $ENV{GRUNTMASTER_KILL_USER};
  43 my @sudo;
  44 @sudo = (shellwords ($ENV{GRUNTMASTER_SUDO}), '--') if $ENV{GRUNTMASTER_SUDO} && $sudo;
  45 undef $mlimit if @sudo; # sudo wants a lot of address space
  46
  47 my $ret = fork // die 'Cannot fork';
  48 if ($ret) {
  49         my $tle;
  50         local $SIG{ALRM} = sub {
  51                 if ($killuser) {
  52                         system @sudo, 'pkill', '-KILL', '-u', $killuser;
  53                 } else {
  54                         kill KILL => $ret
  55                 }
  56                 $tle = 1
  57         };
  58         alarm ($timeout || 10);
  59         waitpid $ret, 0;
  60         alarm 0;
  61         if (@sudo) {
  62                 $? = $? >> 8;
  63                 $? = $? < 128 || $? > 128+32 ? ($? << 8) : $? - 128;
  64         }
  65         my $sig = $? & 127;
  66         my $signame = sig_name $sig;
  67         exit !say TLE,  "\nTime Limit Exceeded"   if $tle;
  68         exit !say OLE,  "\nOutput Limit Exceeded" if $sig && $signame eq 'XFSZ';
  69         exit !say DIED, "\nCrash (SIG$signame)"   if $sig && ($signame ne 'PIPE' || $ARGV[0] !~ /prog/);
  70         exit !say NZX,  "\nNon-zero exit status: " . ($? >> 8) if $? >> 8;
  71         exit !say AC,   "\nAll OK";
  72 } else {
  73         $^F = 50;
  74         POSIX::close 2 unless $keep_stderr;
  75         POSIX::close $_ for 0, 1, 3 .. $^F;
  76         for my $fdstring (@fds) {
  77                 my ($fd, $file) = split ' ', $fdstring, 2;
  78                 open my $fh, $file or die $!;
  79                 my $oldfd = fileno $fh;
  80                 if ($oldfd != $fd) {
  81                         POSIX::dup2 $oldfd, $fd or die $!;
  82                         POSIX::close $oldfd or die $!;
  83                 }
  84         }
  85         my $nproc = $killuser ? 15 : 1;
  86         my $debug = $ENV{TEST_VERBOSE};
  87         %ENV = (ONLINE_JUDGE => 1, PATH => $ENV{PATH}, HOME => $ENV{HOME});
  88         setrlimit RLIMIT_AS, $mlimit, $mlimit or die $! if $mlimit;
  89         setrlimit RLIMIT_FSIZE, $olimit, $olimit or die $! if $olimit;
  90         setrlimit RLIMIT_NPROC, $nproc, $nproc or die $! if $sudo;
  91         open my $adj, '>', '/proc/self/oom_score_adj';
  92         print $adj 900;
  93         close $adj;
  94         unshift @ARGV, @sudo;
  95         say STDERR "Executing: ", join ' ', map { "'$_'" } @ARGV if $debug;
  96         exec @ARGV;
  97 }
  98
  99 1;
 100 __END__
 101
 102 =encoding utf-8
 103
 104 =head1 NAME
 105
 106 gruntmaster-exec - Gruntmaster 6000 executor
 107
 108 =head1 SYNOPSIS
 109
 110   gruntmaster-exec 20000000 111 echo 'Hello, world!'
 111
 112 =head1 DESCRIPTION
 113
 114 gruntmaster-exec is the script used by gruntmasterd to run programs.
 115
 116 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.
 117
 118 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.
 119
 120 =head1 AUTHOR
 121
 122 Marius Gavrilescu E<lt>marius@ieval.roE<gt>
 123
 124 =head1 COPYRIGHT AND LICENSE
 125
 126 Copyright (C) 2014 by Marius Gavrilescu
 127
 128 This program is free software: you can redistribute it and/or modify
 129 it under the terms of the GNU Affero General Public License as published by
 130 the Free Software Foundation, either version 3 of the License, or
 131 (at your option) any later version.