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 sub test_pipe_read {
  43         my $data = '';
  44         sysread STDIN, $data, 4096 and syswrite STDOUT, "recvd\n" until $data =~ /done/;
  45         syswrite STDOUT, 'done';
  46 }
  47
  48 sub test_pipe_write {
  49         my ($rin, $rout);
  50         vec($rin, fileno STDIN, 1) = 1;
  51         syswrite STDOUT, "data\n" until select $rout = $rin, undef, undef, 0.05;
  52         syswrite STDOUT, 'done';
  53         my $data = '';
  54         sysread STDIN, $data, 4096 until $data =~ /done/;
  55 }
  56
  57 sub test_pipes {
  58         $ARGV[0] =~ /prog/ ? test_pipe_read : test_pipe_write
  59 }
  60
  61 my @sudo;
  62 @sudo = (shellwords ($ENV{GRUNTMASTER_SUDO}), '--') if $ENV{GRUNTMASTER_SUDO} && $sudo;
  63 undef $mlimit if @sudo; # sudo wants a lot of address space
  64
  65 my $ret = fork // die 'Cannot fork';
  66 if ($ret) {
  67         my ($tle, $child_ready);
  68         local $SIG{USR1} = sub { $child_ready = 1 };
  69         sleep 3; # Wait for ready signal (SIGUSR1)
  70         unless ($child_ready) {
  71                 kill KILL => $ret;
  72                 exit !say ERR, "\nNo response from gruntmaster-exec child";
  73         }
  74         local $SIG{ALRM} = sub {
  75                 kill KILL => $ret;
  76                 $tle = 1
  77         };
  78         alarm ($timeout || 10);
  79         waitpid $ret, 0;
  80         alarm 0;
  81         if (@sudo) {
  82                 $? = $? >> 8;
  83                 $? = $? < 128 || $? > 128+32 ? ($? << 8) : $? - 128;
  84         }
  85         my $sig = $? & 127;
  86         my $signame = sig_name $sig;
  87         exit !say TLE,  "\nTime Limit Exceeded"   if $tle;
  88         exit !say OLE,  "\nOutput Limit Exceeded" if $sig && $signame eq 'XFSZ';
  89         exit !say DIED, "\nCrash (SIG$signame)"   if $sig && ($signame ne 'PIPE' || $ARGV[0] !~ /prog/);
  90         exit !say NZX,  "\nNon-zero exit status: " . ($? >> 8) if $? >> 8;
  91         exit !say AC,   "\nAll OK";
  92 } else {
  93         $^F = 50;
  94         POSIX::close 2 unless $keep_stderr;
  95         POSIX::close $_ for 0, 1, 3 .. $^F;
  96         for my $fdstring (@fds) {
  97                 my ($fd, $file) = split ' ', $fdstring, 2;
  98                 open my $fh, $file or die $!;
  99                 my $oldfd = fileno $fh;
 100                 if ($oldfd != $fd) {
 101                         POSIX::dup2 $oldfd, $fd or die $!;
 102                         POSIX::close $oldfd or die $!;
 103                 }
 104         }
 105         test_pipes if grep /tty|fifo/, @fds;
 106         my $nproc = 15;
 107         my $debug = $ENV{TEST_VERBOSE};
 108         %ENV = (ONLINE_JUDGE => 1, PATH => $ENV{PATH}, HOME => $ENV{HOME});
 109         setrlimit RLIMIT_AS, $mlimit, $mlimit or die $! if $mlimit;
 110         setrlimit RLIMIT_FSIZE, $olimit, $olimit or die $! if $olimit;
 111         setrlimit RLIMIT_NPROC, $nproc, $nproc or die $! if $sudo;
 112         open my $adj, '>', '/proc/self/oom_score_adj';
 113         print $adj 900;
 114         close $adj;
 115         unshift @ARGV, @sudo;
 116         kill USR1 => getppid; # Tell parent process that we're ready
 117         say STDERR "Executing: ", join ' ', map { "'$_'" } @ARGV if $debug;
 118         exec @ARGV;
 119 }
 120
 121 1;
 122 __END__
 123
 124 =encoding utf-8
 125
 126 =head1 NAME
 127
 128 gruntmaster-exec - Gruntmaster 6000 executor
 129
 130 =head1 SYNOPSIS
 131
 132   gruntmaster-exec 20000000 111 echo 'Hello, world!'
 133
 134 =head1 DESCRIPTION
 135
 136 gruntmaster-exec is the script used by gruntmasterd to run programs.
 137
 138 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.
 139
 140 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.
 141
 142 =head1 AUTHOR
 143
 144 Marius Gavrilescu E<lt>marius@ieval.roE<gt>
 145
 146 =head1 COPYRIGHT AND LICENSE
 147
 148 Copyright (C) 2014 by Marius Gavrilescu
 149
 150 This program is free software: you can redistribute it and/or modify
 151 it under the terms of the GNU Affero General Public License as published by
 152 the Free Software Foundation, either version 3 of the License, or
 153 (at your option) any later version.