Fix purging of standings
[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 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.
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