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 $killuser = $ENV{GRUNTMASTER_KILL_USER};
  62 my @sudo;
  63 @sudo = (shellwords ($ENV{GRUNTMASTER_SUDO}), '--') if $ENV{GRUNTMASTER_SUDO} && $sudo;
  64 undef $mlimit if @sudo; # sudo wants a lot of address space
  65
  66 my $ret = fork // die 'Cannot fork';
  67 if ($ret) {
  68         my ($tle, $child_ready);
  69         local $SIG{USR1} = sub { $child_ready = 1 };
  70         sleep 3; # Wait for ready signal (SIGUSR1)
  71         unless ($child_ready) {
  72                 kill KILL => $ret;
  73                 exit !say ERR, "\nNo response from gruntmaster-exec child";
  74         }
  75         local $SIG{ALRM} = sub {
  76                 if ($killuser) {
  77                         system @sudo, 'pkill', '-KILL', '-u', $killuser;
  78                 } else {
  79                         kill KILL => $ret
  80                 }
  81                 $tle = 1
  82         };
  83         alarm ($timeout || 10);
  84         waitpid $ret, 0;
  85         alarm 0;
  86         if (@sudo) {
  87                 $? = $? >> 8;
  88                 $? = $? < 128 || $? > 128+32 ? ($? << 8) : $? - 128;
  89         }
  90         my $sig = $? & 127;
  91         my $signame = sig_name $sig;
  92         exit !say TLE,  "\nTime Limit Exceeded"   if $tle;
  93         exit !say OLE,  "\nOutput Limit Exceeded" if $sig && $signame eq 'XFSZ';
  94         exit !say DIED, "\nCrash (SIG$signame)"   if $sig && ($signame ne 'PIPE' || $ARGV[0] !~ /prog/);
  95         exit !say NZX,  "\nNon-zero exit status: " . ($? >> 8) if $? >> 8;
  96         exit !say AC,   "\nAll OK";
  97 } else {
  98         $^F = 50;
  99         POSIX::close 2 unless $keep_stderr;
 100         POSIX::close $_ for 0, 1, 3 .. $^F;
 101         for my $fdstring (@fds) {
 102                 my ($fd, $file) = split ' ', $fdstring, 2;
 103                 open my $fh, $file or die $!;
 104                 my $oldfd = fileno $fh;
 105                 if ($oldfd != $fd) {
 106                         POSIX::dup2 $oldfd, $fd or die $!;
 107                         POSIX::close $oldfd or die $!;
 108                 }
 109         }
 110         test_pipes if grep /tty|fifo/, @fds;
 111         my $nproc = $killuser ? 15 : 1;
 112         my $debug = $ENV{TEST_VERBOSE};
 113         %ENV = (ONLINE_JUDGE => 1, PATH => $ENV{PATH}, HOME => $ENV{HOME});
 114         setrlimit RLIMIT_AS, $mlimit, $mlimit or die $! if $mlimit;
 115         setrlimit RLIMIT_FSIZE, $olimit, $olimit or die $! if $olimit;
 116         setrlimit RLIMIT_NPROC, $nproc, $nproc or die $! if $sudo;
 117         open my $adj, '>', '/proc/self/oom_score_adj';
 118         print $adj 900;
 119         close $adj;
 120         unshift @ARGV, @sudo;
 121         kill USR1 => getppid; # Tell parent process that we're ready
 122         say STDERR "Executing: ", join ' ', map { "'$_'" } @ARGV if $debug;
 123         exec @ARGV;
 124 }
 125
 126 1;
 127 __END__
 128
 129 =encoding utf-8
 130
 131 =head1 NAME
 132
 133 gruntmaster-exec - Gruntmaster 6000 executor
 134
 135 =head1 SYNOPSIS
 136
 137   gruntmaster-exec 20000000 111 echo 'Hello, world!'
 138
 139 =head1 DESCRIPTION
 140
 141 gruntmaster-exec is the script used by gruntmasterd to run programs.
 142
 143 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.
 144
 145 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.
 146
 147 =head1 AUTHOR
 148
 149 Marius Gavrilescu E<lt>marius@ieval.roE<gt>
 150
 151 =head1 COPYRIGHT AND LICENSE
 152
 153 Copyright (C) 2014 by Marius Gavrilescu
 154
 155 This program is free software: you can redistribute it and/or modify
 156 it under the terms of the GNU Affero General Public License as published by
 157 the Free Software Foundation, either version 3 of the License, or
 158 (at your option) any later version.