Add a --no-close argument to gruntmaster-exec
[gruntmaster-daemon.git] / 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/;
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 Time::HiRes qw/alarm/;
29
30 my (@fds, $timeout, $mlimit, $olimit);
31 my $close = 1;
32
33 GetOptions(
34 "fd=s" => \@fds,
35 "timeout=f" => \$timeout,
36 "mlimit=i" => \$mlimit,
37 "olimit=i" => \$olimit,
38 "close!" => \$close,
39 );
40
41 my $ret = fork // die 'Cannot fork';
42 if ($ret) {
43 my $tle;
44 local $SIG{ALRM} = sub { kill KILL => $ret; $tle = 1};
45 alarm ($timeout || 5);
46 waitpid $ret, 0;
47 alarm 0;
48 my $sig = $? & 127;
49 my $signame = sig_name $sig;
50 exit !say TLE, "\nTime Limit Exceeded" if $tle;
51 exit !say OLE, "\nOutput Limit Exceeded" if $sig && $signame eq 'XFSZ';
52 exit !say DIED, "\nCrash (SIG$signame)" if $sig && $signame ne 'PIPE';
53 exit !say NZX, "\nNon-zero exit status: " . ($? >> 8) if $? >> 8;
54 exit !say AC, "\nAll OK";
55 } else {
56 $^F = 50;
57 if ($close) {
58 POSIX::close $_ for 0 .. $^F;
59 }
60 for my $fdstring (@fds) {
61 my ($fd, $file) = split ' ', $fdstring, 2;
62 open my $fh, $file or die $!;
63 my $oldfd = fileno $fh;
64 if ($oldfd != $fd) {
65 POSIX::dup2 $oldfd, $fd or die $!;
66 POSIX::close $oldfd or die $!;
67 }
68 }
69 %ENV = (ONLINE_JUDGE => 1, PATH => $ENV{PATH}, HOME => $ENV{HOME});
70 setrlimit RLIMIT_AS, $mlimit, $mlimit or die $! if $mlimit;
71 setrlimit RLIMIT_FSIZE, $olimit, $olimit or die $! if $olimit;
72 POSIX::setgid 65534; # Set group id to nogroup
73 POSIX::setuid 65534; # Set user id to nobody
74 exec @ARGV;
75 }
76
77 1;
78 __END__
79
80 =encoding utf-8
81
82 =head1 NAME
83
84 gruntmaster-exec - Gruntmaster 6000 executor
85
86 =head1 SYNOPSIS
87
88 gruntmaster-exec 20000000 111 echo 'Hello, world!'
89
90 =head1 DESCRIPTION
91
92 gruntmaster-exec is the script used by gruntmasterd to run programs.
93
94 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.
95
96 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.
97
98 =head1 AUTHOR
99
100 Marius Gavrilescu E<lt>marius@ieval.roE<gt>
101
102 =head1 COPYRIGHT AND LICENSE
103
104 Copyright (C) 2014 by Marius Gavrilescu
105
106 This program is free software: you can redistribute it and/or modify
107 it under the terms of the GNU Affero General Public License as published by
108 the Free Software Foundation, either version 3 of the License, or
109 (at your option) any later version.
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