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 && $signame ne 'PIPE';
  70         exit !say NZX,  "\nNon-zero exit status: " . ($? >> 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 $sudo;
  91         unshift @ARGV, @sudo;
  92         say STDERR "Executing: ", join ' ', map { "'$_'" } @ARGV if $debug;
  93         exec @ARGV;
  94 }
  95
  96 1;
  97 __END__
  98
  99 =encoding utf-8
 100
 101 =head1 NAME
 102
 103 gruntmaster-exec - Gruntmaster 6000 executor
 104
 105 =head1 SYNOPSIS
 106
 107   gruntmaster-exec 20000000 111 echo 'Hello, world!'
 108
 109 =head1 DESCRIPTION
 110
 111 gruntmaster-exec is the script used by gruntmasterd to run programs.
 112
 113 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.
 114
 115 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.
 116
 117 =head1 AUTHOR
 118
 119 Marius Gavrilescu E<lt>marius@ieval.roE<gt>
 120
 121 =head1 COPYRIGHT AND LICENSE
 122
 123 Copyright (C) 2014 by Marius Gavrilescu
 124
 125 This program is free software: you can redistribute it and/or modify
 126 it under the terms of the GNU Affero General Public License as published by
 127 the Free Software Foundation, either version 3 of the License, or
 128 (at your option) any later version.