submit/MO/Submit.pm

   1 # A Perl module for communicating with the MO Submit Server
   2 # (c) 2007 Martin Mares <mj@ucw.cz>
   3
   4 package MO::Submit;
   5
   6 use strict;
   7 use warnings;
   8
   9 use IO::Socket::INET;
  10 use IO::Socket::SSL; # qw(debug3);
  11 use Sherlock::Object;
  12 use POSIX;
  13
  14 sub new($) {
  15         my $user = $ENV{"USER"} or die "Environment variable USER not set\n";
  16         my $home = $ENV{"HOME"} or die "Environment variable HOME not set\n";
  17         my $mo = "$home/.mo";
  18         my $root = $ENV{"MO_ROOT"} or die "Environment variable MO_ROOT not set\n";
  19         my $self = {
  20                 "Contest" => "CPSPC 2007",
  21                 "Server" => "kamzice.ms.mff.cuni.cz:8888",
  22                 "Key" => "$mo/key.pem",         # Keys and certificates
  23                 "Cert" => "$mo/cert.pem",
  24                 "CACert" => "$mo/ca-cert.pem",
  25                 "Trace" => defined $ENV{"MO_SUBMIT_TRACE"},
  26                 "Checks" => 1,
  27 #               "History" => "$home/.history",  # Keep submission history in this directory
  28                 "RefreshTimer" => 60000,        # How often GUI sends STATUS commands [ms]
  29                 "root" => $root,
  30                 "user" => $user,
  31                 "sk" => undef,
  32                 "error" => undef,
  33         };
  34         return bless $self;
  35 }
  36
  37 sub DESTROY($) {
  38         my $self = shift @_;
  39         $self->disconnect;
  40 }
  41
  42 sub log($$) {
  43         my ($self, $msg) = @_;
  44         print STDERR "SUBMIT: $msg\n" if $self->{"Trace"};
  45 }
  46
  47 sub err($$) {
  48         my ($self, $msg) = @_;
  49         print STDERR "ERROR: $msg\n" if $self->{"Trace"};
  50         $self->{"error"} = $msg;
  51         $self->disconnect;
  52 }
  53
  54 sub is_connected($) {
  55         my $self = shift @_;
  56         return defined $self->{"sk"};
  57 }
  58
  59 sub disconnect($) {
  60         my $self = shift @_;
  61         if ($self->is_connected) {
  62                 close $self->{"sk"};
  63                 $self->{"sk"} = undef;
  64                 $self->log("Disconnected");
  65         }
  66 }
  67
  68 sub connect($) {
  69         my $self = shift @_;
  70         $self->disconnect;
  71         $self->log("Connecting to submit server");
  72         my $sk = new IO::Socket::INET(
  73                 PeerAddr => $self->{"Server"},
  74                 Proto => "tcp",
  75         );
  76         if (!defined $sk) {
  77                 $self->err("Cannot connect to server: $!");
  78                 return undef;
  79         }
  80         my $z = <$sk>;
  81         if (!defined $z) {
  82                 $self->err("Server failed to send a welcome message");
  83                 close $sk;
  84                 return undef;
  85         }
  86         chomp $z;
  87         if ($z !~ /^\+/) {
  88                 $self->err("Server rejected the connection: $z");
  89                 close $sk;
  90                 return undef;
  91         }
  92         if ($z =~ /TLS/) {
  93                 $self->log("Starting TLS");
  94                 $sk = IO::Socket::SSL->start_SSL(
  95                         $sk,
  96                         SSL_version => 'TLSv1',
  97                         SSL_use_cert => 1,
  98                         SSL_key_file => $self->{"Key"},
  99                         SSL_cert_file => $self->{"Cert"},
 100                         SSL_ca_file => $self->{"CACert"},
 101                         SSL_verify_mode => 3,
 102                 );
 103                 if (!defined $sk) {
 104                         $self->err("Cannot establish TLS connection: " . IO::Socket::SSL::errstr());
 105                         return undef;
 106                 }
 107         }
 108         $self->{"sk"} = $sk;
 109
 110         $self->log("Logging in");
 111         my $req = new Sherlock::Object("U" => $self->{"user"});
 112         my $reply = $self->request($req);
 113         my $err = $reply->get("-");
 114         if (defined $err) {
 115                 $self->err("Cannot log in: $err");
 116                 return undef;
 117         }
 118
 119         $self->log("Connected");
 120         return 1;
 121 }
 122
 123 sub request($$) {
 124         my ($self, $obj) = @_;
 125         my $sk = $self->{"sk"};
 126         $obj->write($sk);       ### FIXME: Flushing
 127         if ($sk->error) {
 128                 $self->err("Connection broken");
 129                 return undef;
 130         }
 131         print $sk "\n";
 132         return $self->reply;
 133 }
 134
 135 sub reply($) {
 136         my ($self, $obj) = @_;
 137         my $sk = $self->{"sk"};
 138         my $reply = new Sherlock::Object;
 139         if ($reply->read($sk)) {
 140                 return $reply;
 141         } else {
 142                 $self->err("Connection broken");
 143                 return undef;
 144         }
 145 }
 146
 147 sub send_file($$$) {
 148         my ($self, $fh, $size) = @_;
 149         my $sk = $self->{"sk"};
 150         while ($size) {
 151                 my $l = ($size < 4096 ? $size : 4096);
 152                 my $buf = "";
 153                 if ($fh->read($buf, $l) != $l) {
 154                         $self->err("File shrunk during upload");
 155                         return undef;
 156                 }
 157                 $sk->write($buf, $l);
 158                 if ($sk->error) {
 159                         $self->err("Connection broken");
 160                         return undef;
 161                 }
 162                 $size -= $l;
 163         }
 164         return $self->reply;
 165 }
 166
 167 sub local_submit($$$$$) {
 168         my ($self, $task, $part, $ext, $filename) = @_;
 169         my $hist = $self->{"History"};
 170         -d $hist or mkdir $hist or return "Unable to create $hist: $!";
 171         ### FIXME: Unfinished
 172 }
 173
 174 1;