perl/DXMsg.pm

   1 #!/usr/bin/perl
   2 #
   3 # This module impliments the message handling for a dx cluster
   4 #
   5 # Copyright (c) 1998 Dirk Koopman G1TLH
   6 #
   7 # $Id$
   8 #
   9 #
  10 # Notes for implementors:-
  11 #
  12 # PC28 field 11 is the RR required flag
  13 # PC28 field 12 is a VIA routing (ie it is a node call)
  14 #
  15
  16 package DXMsg;
  17
  18 use DXUtil;
  19 use DXChannel;
  20 use DXUser;
  21 use DXM;
  22 use DXProtVars;
  23 use DXProtout;
  24 use DXDebug;
  25 use DXLog;
  26 use IO::File;
  27 use Fcntl;
  28
  29 use strict;
  30
  31 use vars qw($VERSION $BRANCH);
  32 $VERSION = sprintf( "%d.%03d", q$Revision$ =~ /(\d+)\.(\d+)/ );
  33 $BRANCH = sprintf( "%d.%03d", q$Revision$ =~ /\d+\.\d+\.(\d+)\.(\d+)/ ) || 0;
  34 $main::build += $VERSION;
  35 $main::branch += $BRANCH;
  36
  37 use vars qw(%work @msg $msgdir %valid %busy $maxage $last_clean
  38                         @badmsg @swop $swopfn $badmsgfn $forwardfn @forward $timeout $waittime
  39                     $queueinterval $lastq $importfn $minchunk $maxchunk $bulltopriv);
  40
  41 %work = ();                                             # outstanding jobs
  42 @msg = ();                                              # messages we have
  43 %busy = ();                                             # station interlocks
  44 $msgdir = "$main::root/msg";    # directory contain the msgs
  45 $maxage = 30 * 86400;                   # the maximum age that a message shall live for if not marked
  46 $last_clean = 0;                                # last time we did a clean
  47 @forward = ();                  # msg forward table
  48 @badmsg = ();                                   # bad message table
  49 @swop = ();                                             # swop table
  50 $timeout = 30*60;               # forwarding timeout
  51 $waittime = 30*60;              # time an aborted outgoing message waits before trying again
  52 $queueinterval = 1*60;          # run the queue every 1 minute
  53 $lastq = 0;
  54
  55 $minchunk = 4800;               # minimum chunk size for a split message
  56 $maxchunk = 6000;               # maximum chunk size
  57 $bulltopriv = 1;                                # convert msgs with callsigns to private if they are bulls
  58
  59
  60 $badmsgfn = "$msgdir/badmsg.pl";    # list of TO address we wont store
  61 $forwardfn = "$msgdir/forward.pl";  # the forwarding table
  62 $swopfn = "$msgdir/swop.pl";        # the swopping table
  63 $importfn = "$msgdir/import";       # import directory
  64
  65
  66 %valid = (
  67                   fromnode => '5,From Node',
  68                   tonode => '5,To Node',
  69                   to => '0,To',
  70                   from => '0,From',
  71                   t => '0,Msg Time,cldatetime',
  72                   private => '5,Private,yesno',
  73                   subject => '0,Subject',
  74                   linesreq => '0,Lines per Gob',
  75                   rrreq => '5,Read Confirm,yesno',
  76                   origin => '0,Origin',
  77                   lines => '5,Data',
  78                   stream => '9,Stream No',
  79                   count => '5,Gob Linecnt',
  80                   file => '5,File?,yesno',
  81                   gotit => '5,Got it Nodes,parray',
  82                   lines => '5,Lines,parray',
  83                   'read' => '5,Times read',
  84                   size => '0,Size',
  85                   msgno => '0,Msgno',
  86                   keep => '0,Keep this?,yesno',
  87                   lastt => '5,Last processed,cldatetime',
  88                   waitt => '5,Wait until,cldatetime',
  89                  );
  90
  91 # allocate a new object
  92 # called fromnode, tonode, from, to, datetime, private?, subject, nolinesper
  93 sub alloc
  94 {
  95         my $pkg = shift;
  96         my $self = bless {}, $pkg;
  97         $self->{msgno} = shift;
  98         my $to = shift;
  99         #  $to =~ s/-\d+$//o;
 100         $self->{to} = ($to eq $main::mycall) ? $main::myalias : $to;
 101         my $from = shift;
 102         $from =~ s/-\d+$//o;
 103         $self->{from} = uc $from;
 104         $self->{t} = shift;
 105         $self->{private} = shift;
 106         $self->{subject} = shift;
 107         $self->{origin} = shift;
 108         $self->{'read'} = shift;
 109         $self->{rrreq} = shift;
 110         $self->{gotit} = [];
 111 #       $self->{lastt} = $main::systime;
 112         $self->{lines} = [];
 113         $self->{private} = 1 if $bulltopriv && DXUser->get_current($self->{to});
 114
 115         return $self;
 116 }
 117
 118 sub workclean
 119 {
 120         my $ref = shift;
 121         delete $ref->{lines};
 122         delete $ref->{linesreq};
 123         delete $ref->{tonode};
 124         delete $ref->{fromnode};
 125         delete $ref->{stream};
 126         delete $ref->{file};
 127         delete $ref->{count};
 128         delete $ref->{lastt} if exists $ref->{lastt};
 129         delete $ref->{waitt} if exists $ref->{waitt};
 130 }
 131
 132 sub process
 133 {
 134         my ($self, $line) = @_;
 135
 136         # this is periodic processing
 137         if (!$self || !$line) {
 138
 139                 if ($main::systime >= $lastq + $queueinterval) {
 140
 141                         # queue some message if the interval timer has gone off
 142                         queue_msg(0);
 143
 144                         # import any messages in the import directory
 145                         import_msgs();
 146
 147                         $lastq = $main::systime;
 148                 }
 149
 150                 # clean the message queue
 151                 clean_old() if $main::systime - $last_clean > 3600 ;
 152                 return;
 153         }
 154
 155         my @f = split /\^/, $line;
 156         my ($pcno) = $f[0] =~ /^PC(\d\d)/; # just get the number
 157
 158  SWITCH: {
 159                 if ($pcno == 28) {              # incoming message
 160
 161                         # sort out various extant protocol errors that occur
 162                         my ($fromnode, $origin);
 163                         if ($self->is_arcluster && $f[13] eq $self->call) {
 164                                 $fromnode = $f[13];
 165                                 $origin = $f[2];
 166                         } else {
 167                                 $fromnode = $f[2];
 168                             $origin = $f[13];
 169                         }
 170                         $origin = $self->call unless $origin && $origin gt ' ';
 171
 172                         # first look for any messages in the busy queue
 173                         # and cancel them this should both resolve timed out incoming messages
 174                         # and crossing of message between nodes, incoming messages have priority
 175
 176                         if (exists $busy{$fromnode}) {
 177                                 my $ref = $busy{$fromnode};
 178                                 my $tonode = $ref->{tonode} || "unknown";
 179                                 dbg("Busy, stopping msgno: $ref->{msgno} $fromnode->$tonode") if isdbg('msg');
 180                                 $ref->stop_msg($self->call);
 181                         }
 182
 183                         my $t = cltounix($f[5], $f[6]);
 184                         my $stream = next_transno($fromnode);
 185                         my $ref = DXMsg->alloc($stream, uc $f[3], $f[4], $t, $f[7], $f[8], $origin, '0', $f[11]);
 186
 187                         # fill in various forwarding state variables
 188                         $ref->{fromnode} = $fromnode;
 189                         $ref->{tonode} = $f[1];
 190                         $ref->{rrreq} = $f[11];
 191                         $ref->{linesreq} = $f[10];
 192                         $ref->{stream} = $stream;
 193                         $ref->{count} = 0;      # no of lines between PC31s
 194                         dbg("new message from $f[4] to $f[3] '$f[8]' stream $fromnode/$stream\n") if isdbg('msg');
 195                         Log('msg', "Incoming message $f[4] to $f[3] '$f[8]'" );
 196                         $work{"$fromnode$stream"} = $ref; # store in work
 197                         $busy{$fromnode} = $ref; # set interlock
 198                         $self->send(DXProt::pc30($fromnode, $f[1], $stream)); # send ack
 199                         $ref->{lastt} = $main::systime;
 200
 201                         # look to see whether this is a non private message sent to a known callsign
 202                         my $uref = DXUser->get_current($ref->{to});
 203                         if (is_callsign($ref->{to}) && !$ref->{private} && $uref && $uref->homenode) {
 204                                 $ref->{private} = 1;
 205                                 dbg("set bull to $ref->{to} to private") if isdbg('msg');
 206                         }
 207                         last SWITCH;
 208                 }
 209
 210                 if ($pcno == 29) {              # incoming text
 211                         my $ref = $work{"$f[2]$f[3]"};
 212                         if ($ref) {
 213                                 $f[4] =~ s/\%5E/^/g;
 214                                 push @{$ref->{lines}}, $f[4];
 215                                 $ref->{count}++;
 216                                 if ($ref->{count} >= $ref->{linesreq}) {
 217                                         $self->send(DXProt::pc31($f[2], $f[1], $f[3]));
 218                                         dbg("stream $f[3]: $ref->{count} lines received\n") if isdbg('msg');
 219                                         $ref->{count} = 0;
 220                                 }
 221                                 $ref->{lastt} = $main::systime;
 222                         } else {
 223                                 dbg("PC29 from unknown stream $f[3] from $f[2]") if isdbg('msg');
 224                                 $self->send(DXProt::pc42($f[2], $f[1], $f[3])); # unknown stream
 225                         }
 226                         last SWITCH;
 227                 }
 228
 229                 if ($pcno == 30) {              # this is a incoming subject ack
 230                         my $ref = $work{$f[2]}; # note no stream at this stage
 231                         if ($ref) {
 232                                 delete $work{$f[2]};
 233                                 $ref->{stream} = $f[3];
 234                                 $ref->{count} = 0;
 235                                 $ref->{linesreq} = 5;
 236                                 $work{"$f[2]$f[3]"} = $ref;     # new ref
 237                                 dbg("incoming subject ack stream $f[3]\n") if isdbg('msg');
 238                                 $busy{$f[2]} = $ref; # interlock
 239                                 push @{$ref->{lines}}, ($ref->read_msg_body);
 240                                 $ref->send_tranche($self);
 241                                 $ref->{lastt} = $main::systime;
 242                         } else {
 243                                 dbg("PC30 from unknown stream $f[3] from $f[2]") if isdbg('msg');
 244                                 $self->send(DXProt::pc42($f[2], $f[1], $f[3])); # unknown stream
 245                         }
 246                         last SWITCH;
 247                 }
 248
 249                 if ($pcno == 31) {              # acknowledge a tranche of lines
 250                         my $ref = $work{"$f[2]$f[3]"};
 251                         if ($ref) {
 252                                 dbg("tranche ack stream $f[3]\n") if isdbg('msg');
 253                                 $ref->send_tranche($self);
 254                                 $ref->{lastt} = $main::systime;
 255                         } else {
 256                                 dbg("PC31 from unknown stream $f[3] from $f[2]") if isdbg('msg');
 257                                 $self->send(DXProt::pc42($f[2], $f[1], $f[3])); # unknown stream
 258                         }
 259                         last SWITCH;
 260                 }
 261
 262                 if ($pcno == 32) {              # incoming EOM
 263                         dbg("stream $f[3]: EOM received\n") if isdbg('msg');
 264                         my $ref = $work{"$f[2]$f[3]"};
 265                         if ($ref) {
 266                                 $self->send(DXProt::pc33($f[2], $f[1], $f[3])); # acknowledge it
 267
 268                                 # get the next msg no - note that this has NOTHING to do with the stream number in PC protocol
 269                                 # store the file or message
 270                                 # remove extraneous rubbish from the hash
 271                                 # remove it from the work in progress vector
 272                                 # stuff it on the msg queue
 273                                 if ($ref->{lines}) {
 274                                         if ($ref->{file}) {
 275                                                 $ref->store($ref->{lines});
 276                                         } else {
 277
 278                                                 # does an identical message already exist?
 279                                                 my $m;
 280                                                 for $m (@msg) {
 281                                                         if ($ref->{subject} eq $m->{subject} && $ref->{t} == $m->{t} && $ref->{from} eq $m->{from} && $ref->{to} eq $m->{to}) {
 282                                                                 $ref->stop_msg($self->call);
 283                                                                 my $msgno = $m->{msgno};
 284                                                                 dbg("duplicate message from $ref->{from} -> $ref->{to} to msg: $msgno") if isdbg('msg');
 285                                                                 Log('msg', "duplicate message from $ref->{from} -> $ref->{to} to msg: $msgno");
 286                                                                 return;
 287                                                         }
 288                                                 }
 289
 290                                                 # swop addresses
 291                                                 $ref->swop_it($self->call);
 292
 293                                                 # look for 'bad' to addresses
 294                                                 if ($ref->dump_it($self->call)) {
 295                                                         $ref->stop_msg($self->call);
 296                                                         dbg("'Bad' message $ref->{to}") if isdbg('msg');
 297                                                         Log('msg', "'Bad' message $ref->{to}");
 298                                                         return;
 299                                                 }
 300
 301                                                 # check the message for bad words
 302                                                 my @words;
 303                                                 for (@{$ref->{lines}}) {
 304                                                         push @words, BadWords::check($_);
 305                                                 }
 306                                                 push @words, BadWords::check($ref->{subject});
 307                                                 if (@words) {
 308                                                         dbg("message with badwords '@words' $ref->{from} -> $ref->{to} '$ref->{subject}' origin: $ref->{origin} via " . $self->call) if isdbg('msg');
 309                                                         Log('msg',"message with badwords '@words' $ref->{from} -> $ref->{to} origin: $ref->{origin} via " . $self->call);
 310                                                         Log('msg',"subject: $ref->{subject}");
 311                                                         for (@{$ref->{lines}}) {
 312                                                                 Log('msg', "line: $_");
 313                                                         }
 314                                                         $ref->stop_msg($self->call);
 315                                                         return;
 316                                                 }
 317
 318                                                 $ref->{msgno} = next_transno("Msgno");
 319                                                 push @{$ref->{gotit}}, $f[2]; # mark this up as being received
 320                                                 $ref->store($ref->{lines});
 321                                                 add_dir($ref);
 322                                                 my $dxchan = DXChannel->get($ref->{to});
 323                                                 $dxchan->send($dxchan->msg('m9')) if $dxchan && $dxchan->is_user;
 324                                                 Log('msg', "Message $ref->{msgno} from $ref->{from} received from $f[2] for $ref->{to}");
 325                                         }
 326                                 }
 327                                 $ref->stop_msg($self->call);
 328                         } else {
 329                                 dbg("PC32 from unknown stream $f[3] from $f[2]") if isdbg('msg');
 330                                 $self->send(DXProt::pc42($f[2], $f[1], $f[3])); # unknown stream
 331                         }
 332                         # queue_msg(0);
 333                         last SWITCH;
 334                 }
 335
 336                 if ($pcno == 33) {              # acknowledge the end of message
 337                         my $ref = $work{"$f[2]$f[3]"};
 338                         if ($ref) {
 339                                 if ($ref->{private}) { # remove it if it private and gone off site#
 340                                         Log('msg', "Message $ref->{msgno} from $ref->{from} sent to $f[2] and deleted");
 341                                         $ref->del_msg;
 342                                 } else {
 343                                         Log('msg', "Message $ref->{msgno} from $ref->{from} sent to $f[2]");
 344                                         push @{$ref->{gotit}}, $f[2]; # mark this up as being received
 345                                         $ref->store($ref->{lines});     # re- store the file
 346                                 }
 347                                 $ref->stop_msg($self->call);
 348                         } else {
 349                                 dbg("PC33 from unknown stream $f[3] from $f[2]") if isdbg('msg');
 350                                 $self->send(DXProt::pc42($f[2], $f[1], $f[3])); # unknown stream
 351                         }
 352
 353                         # send next one if present
 354                         queue_msg(0);
 355                         last SWITCH;
 356                 }
 357
 358                 if ($pcno == 40) {              # this is a file request
 359                         $f[3] =~ s/\\/\//og; # change the slashes
 360                         $f[3] =~ s/\.//og;      # remove dots
 361                         $f[3] =~ s/^\///o;   # remove the leading /
 362                         $f[3] = lc $f[3];       # to lower case;
 363                         dbg("incoming file $f[3]\n") if isdbg('msg');
 364                         $f[3] = 'packclus/' . $f[3] unless $f[3] =~ /^packclus\//o;
 365
 366                         # create any directories
 367                         my @part = split /\//, $f[3];
 368                         my $part;
 369                         my $fn = "$main::root";
 370                         pop @part;                      # remove last part
 371                         foreach $part (@part) {
 372                                 $fn .= "/$part";
 373                                 next if -e $fn;
 374                                 last SWITCH if !mkdir $fn, 0777;
 375                                 dbg("created directory $fn\n") if isdbg('msg');
 376                         }
 377                         my $stream = next_transno($f[2]);
 378                         my $ref = DXMsg->alloc($stream, "$main::root/$f[3]", $self->call, time, !$f[4], $f[3], ' ', '0', '0');
 379
 380                         # forwarding variables
 381                         $ref->{fromnode} = $f[1];
 382                         $ref->{tonode} = $f[2];
 383                         $ref->{linesreq} = $f[5];
 384                         $ref->{stream} = $stream;
 385                         $ref->{count} = 0;      # no of lines between PC31s
 386                         $ref->{file} = 1;
 387                         $ref->{lastt} = $main::systime;
 388                         $work{"$f[2]$stream"} = $ref; # store in work
 389                         $self->send(DXProt::pc30($f[2], $f[1], $stream)); # send ack
 390
 391                         last SWITCH;
 392                 }
 393
 394                 if ($pcno == 42) {              # abort transfer
 395                         dbg("stream $f[3]: abort received\n") if isdbg('msg');
 396                         my $ref = $work{"$f[2]$f[3]"};
 397                         if ($ref) {
 398                                 $ref->stop_msg($self->call);
 399                                 $ref = undef;
 400                         }
 401                         last SWITCH;
 402                 }
 403
 404                 if ($pcno == 49) {      # global delete on subject
 405                         for (@msg) {
 406                                 if ($_->{from} eq $f[1] && $_->{subject} eq $f[2]) {
 407                                         $_->del_msg();
 408                                         Log('msg', "Message $_->{msgno} from $_->{from} ($_->{subject}) fully deleted");
 409                                         DXChannel::broadcast_nodes($line, $self);
 410                                 }
 411                         }
 412                 }
 413         }
 414 }
 415
 416
 417 # store a message away on disc or whatever
 418 #
 419 # NOTE the second arg is a REFERENCE not a list
 420 sub store
 421 {
 422         my $ref = shift;
 423         my $lines = shift;
 424
 425         if ($ref->{file}) {                     # a file
 426                 dbg("To be stored in $ref->{to}\n") if isdbg('msg');
 427
 428                 my $fh = new IO::File "$ref->{to}", "w";
 429                 if (defined $fh) {
 430                         my $line;
 431                         foreach $line (@{$lines}) {
 432                                 print $fh "$line\n";
 433                         }
 434                         $fh->close;
 435                         dbg("file $ref->{to} stored\n") if isdbg('msg');
 436                         Log('msg', "file $ref->{to} from $ref->{from} stored" );
 437                 } else {
 438                         confess "can't open file $ref->{to} $!";
 439                 }
 440         } else {                                        # a normal message
 441
 442                 # attempt to open the message file
 443                 my $fn = filename($ref->{msgno});
 444
 445                 dbg("To be stored in $fn\n") if isdbg('msg');
 446
 447                 # now save the file, overwriting what's there, YES I KNOW OK! (I will change it if it's a problem)
 448                 my $fh = new IO::File "$fn", "w";
 449                 if (defined $fh) {
 450                         my $rr = $ref->{rrreq} ? '1' : '0';
 451                         my $priv = $ref->{private} ? '1': '0';
 452                         print $fh "=== $ref->{msgno}^$ref->{to}^$ref->{from}^$ref->{t}^$priv^$ref->{subject}^$ref->{origin}^$ref->{'read'}^$rr\n";
 453                         print $fh "=== ", join('^', @{$ref->{gotit}}), "\n";
 454                         my $line;
 455                         $ref->{size} = 0;
 456                         foreach $line (@{$lines}) {
 457                                 $ref->{size} += (length $line) + 1;
 458                                 print $fh "$line\n";
 459                         }
 460                         $fh->close;
 461                         dbg("msg $ref->{msgno} stored\n") if isdbg('msg');
 462                         Log('msg', "msg $ref->{msgno} from $ref->{from} to $ref->{to} stored" );
 463                 } else {
 464                         confess "can't open msg file $fn $!";
 465                 }
 466         }
 467 }
 468
 469 # delete a message
 470 sub del_msg
 471 {
 472         my $self = shift;
 473
 474         # remove it from the active message list
 475         dbg("\@msg = " . scalar @msg . " before delete") if isdbg('msg');
 476         @msg = grep { $_ != $self } @msg;
 477
 478         # remove the file
 479         unlink filename($self->{msgno});
 480         dbg("deleting $self->{msgno}\n") if isdbg('msg');
 481         dbg("\@msg = " . scalar @msg . " after delete") if isdbg('msg');
 482 }
 483
 484 # clean out old messages from the message queue
 485 sub clean_old
 486 {
 487         my $ref;
 488
 489         # mark old messages for deletion
 490         dbg("\@msg = " . scalar @msg . " before delete") if isdbg('msg');
 491         foreach $ref (@msg) {
 492                 if (ref($ref) && !$ref->{keep} && $ref->{t} < $main::systime - $maxage) {
 493                         $ref->{deleteme} = 1;
 494                         unlink filename($ref->{msgno});
 495                         dbg("deleting old $ref->{msgno}\n") if isdbg('msg');
 496                 }
 497         }
 498
 499         # remove them all from the active message list
 500         @msg = grep { !$_->{deleteme} } @msg;
 501         dbg("\@msg = " . scalar @msg . " after delete") if isdbg('msg');
 502         $last_clean = $main::systime;
 503 }
 504
 505 # read in a message header
 506 sub read_msg_header
 507 {
 508         my $fn = shift;
 509         my $file;
 510         my $line;
 511         my $ref;
 512         my @f;
 513         my $size;
 514
 515         $file = new IO::File "$fn";
 516         if (!$file) {
 517             dbg("Error reading $fn $!");
 518             Log('err', "Error reading $fn $!");
 519                 return undef;
 520         }
 521         $size = -s $fn;
 522         $line = <$file>;                        # first line
 523         if ($size == 0 || !$line) {
 524             dbg("Empty $fn $!");
 525             Log('err', "Empty $fn $!");
 526                 return undef;
 527         }
 528         chomp $line;
 529         $size -= length $line;
 530         if (! $line =~ /^===/o) {
 531                 dbg("corrupt first line in $fn ($line)");
 532                 Log('err', "corrupt first line in $fn ($line)");
 533                 return undef;
 534         }
 535         $line =~ s/^=== //o;
 536         @f = split /\^/, $line;
 537         $ref = DXMsg->alloc(@f);
 538
 539         $line = <$file>;                        # second line
 540         chomp $line;
 541         $size -= length $line;
 542         if (! $line =~ /^===/o) {
 543             dbg("corrupt second line in $fn ($line)");
 544             Log('err', "corrupt second line in $fn ($line)");
 545                 return undef;
 546         }
 547         $line =~ s/^=== //o;
 548         $ref->{gotit} = [];
 549         @f = split /\^/, $line;
 550         push @{$ref->{gotit}}, @f;
 551         $ref->{size} = $size;
 552
 553         close($file);
 554
 555         return $ref;
 556 }
 557
 558 # read in a message header
 559 sub read_msg_body
 560 {
 561         my $self = shift;
 562         my $msgno = $self->{msgno};
 563         my $file;
 564         my $line;
 565         my $fn = filename($msgno);
 566         my @out;
 567
 568         $file = new IO::File;
 569         if (!open($file, $fn)) {
 570                 dbg("Error reading $fn $!");
 571                 Log('err' ,"Error reading $fn $!");
 572                 return undef;
 573         }
 574         @out = map {chomp; $_} <$file>;
 575         close($file);
 576
 577         shift @out if $out[0] =~ /^=== /;
 578         shift @out if $out[0] =~ /^=== /;
 579         return @out;
 580 }
 581
 582 # send a tranche of lines to the other end
 583 sub send_tranche
 584 {
 585         my ($self, $dxchan) = @_;
 586         my @out;
 587         my $to = $self->{tonode};
 588         my $from = $self->{fromnode};
 589         my $stream = $self->{stream};
 590         my $lines = $self->{lines};
 591         my ($c, $i);
 592
 593         for ($i = 0, $c = $self->{count}; $i < $self->{linesreq} && $c < @$lines; $i++, $c++) {
 594                 push @out, DXProt::pc29($to, $from, $stream, $lines->[$c]);
 595     }
 596     $self->{count} = $c;
 597
 598     push @out, DXProt::pc32($to, $from, $stream) if $i < $self->{linesreq};
 599         $dxchan->send(@out);
 600 }
 601
 602
 603 # find a message to send out and start the ball rolling
 604 sub queue_msg
 605 {
 606         my $sort = shift;
 607         my $ref;
 608         my $clref;
 609
 610         # bat down the message list looking for one that needs to go off site and whose
 611         # nearest node is not busy.
 612
 613         dbg("queue msg ($sort)\n") if isdbg('msg');
 614         my @nodelist = DXChannel::get_all_nodes;
 615         foreach $ref (@msg) {
 616
 617                 # ignore 'delayed' messages until their waiting time has expired
 618                 if (exists $ref->{waitt}) {
 619                         next if $ref->{waitt} > $main::systime;
 620                         delete $ref->{waitt};
 621                 }
 622
 623                 # any time outs?
 624                 if (exists $ref->{lastt} && $main::systime >= $ref->{lastt} + $timeout) {
 625                         my $node = $ref->{tonode};
 626                         dbg("Timeout, stopping msgno: $ref->{msgno} -> $node") if isdbg('msg');
 627                         Log('msg', "Timeout, stopping msgno: $ref->{msgno} -> $node");
 628                         $ref->stop_msg($node);
 629
 630                         # delay any outgoing messages that fail
 631                         $ref->{waitt} = $main::systime + $waittime + rand(120) if $node ne $main::mycall;
 632                         delete $ref->{lastt};
 633                         next;
 634                 }
 635
 636                 # firstly, is it private and unread? if so can I find the recipient
 637                 # in my cluster node list offsite?
 638
 639                 # deal with routed private messages
 640                 my $dxchan;
 641                 if ($ref->{private}) {
 642                         next if $ref->{'read'};           # if it is read, it is stuck here
 643                         $clref = Route::get($ref->{to});
 644 #                       unless ($clref) {             # otherwise look for a homenode
 645 #                               my $uref = DXUser->get_current($ref->{to});
 646 #                               my $hnode =  $uref->homenode if $uref;
 647 #                               $clref = Route::Node::get($hnode) if $hnode;
 648 #                       }
 649                         if ($clref) {
 650                                 $dxchan = $clref->dxchan;
 651                                 if ($dxchan) {
 652                                         if ($dxchan->is_node) {
 653                                                 next if $clref->call eq $main::mycall;  # i.e. it lives here
 654                                                 $ref->start_msg($dxchan) if !get_busy($dxchan->call)  && $dxchan->state eq 'normal';
 655                                         }
 656                                 } else {
 657                                         dbg("Route: No dxchan for $ref->{to} " . ref($clref) ) if isdbg('msg');
 658                                 }
 659                         }
 660                 } else {
 661
 662                         # otherwise we are dealing with a bulletin or forwarded private message
 663                         # compare the gotit list with
 664                         # the nodelist up above, if there are sites that haven't got it yet
 665                         # then start sending it - what happens when we get loops is anyone's
 666                         # guess, use (to, from, time, subject) tuple?
 667                         foreach $dxchan (@nodelist) {
 668                                 my $call = $dxchan->call;
 669                                 next unless $call;
 670                                 next if $call eq $main::mycall;
 671                                 next if ref $ref->{gotit} && grep $_ eq $call, @{$ref->{gotit}};
 672                                 next unless $ref->forward_it($call);           # check the forwarding file
 673
 674                                 # if we are here we have a node that doesn't have this message
 675                                 if (!get_busy($call)  && $dxchan->state eq 'normal') {
 676                                         $ref->start_msg($dxchan);
 677                                         last;
 678                                 }
 679                         }
 680                 }
 681
 682                 # if all the available nodes are busy then stop
 683                 last if @nodelist == scalar grep { get_busy($_->call) } @nodelist;
 684         }
 685 }
 686
 687 # is there a message for me?
 688 sub for_me
 689 {
 690         my $call = uc shift;
 691         my $ref;
 692
 693         foreach $ref (@msg) {
 694                 # is it for me, private and unread?
 695                 if ($ref->{to} eq $call && $ref->{private}) {
 696                         return 1 if !$ref->{'read'};
 697                 }
 698         }
 699         return 0;
 700 }
 701
 702 # start the message off on its travels with a PC28
 703 sub start_msg
 704 {
 705         my ($self, $dxchan) = @_;
 706
 707         dbg("start msg $self->{msgno}\n") if isdbg('msg');
 708         $self->{linesreq} = 10;
 709         $self->{count} = 0;
 710         $self->{tonode} = $dxchan->call;
 711         $self->{fromnode} = $main::mycall;
 712         $busy{$self->{tonode}} = $self;
 713         $work{$self->{tonode}} = $self;
 714         $self->{lastt} = $main::systime;
 715         my ($fromnode, $origin);
 716         if ($dxchan->is_arcluster) {
 717                 $fromnode = $self->{origin};
 718                 $origin = $self->{fromnode};
 719         } else {
 720                 $fromnode = $self->{fromnode};
 721                 $origin = $self->{origin};
 722         }
 723         $dxchan->send(DXProt::pc28($self->{tonode}, $fromnode, $self->{to}, $self->{from}, $self->{t}, $self->{private}, $self->{subject}, $origin, $self->{rrreq}));
 724 }
 725
 726 # get the ref of a busy node
 727 sub get_busy
 728 {
 729         my $call = shift;
 730         return $busy{$call};
 731 }
 732
 733 # get the busy queue
 734 sub get_all_busy
 735 {
 736         return values %busy;
 737 }
 738
 739 # get the forwarding queue
 740 sub get_fwq
 741 {
 742         return values %work;
 743 }
 744
 745 # stop a message from continuing, clean it out, unlock interlocks etc
 746 sub stop_msg
 747 {
 748         my $self = shift;
 749         my $node = shift;
 750         my $stream = $self->{stream} if exists $self->{stream};
 751
 752
 753         dbg("stop msg $self->{msgno} -> node $node\n") if isdbg('msg');
 754         delete $work{$node};
 755         delete $work{"$node$stream"} if $stream;
 756         $self->workclean;
 757         delete $busy{$node};
 758 }
 759
 760 # get a new transaction number from the file specified
 761 sub next_transno
 762 {
 763         my $name = shift;
 764         $name =~ s/\W//og;                      # remove non-word characters
 765         my $fn = "$msgdir/$name";
 766         my $msgno;
 767
 768         my $fh = new IO::File;
 769         if (sysopen($fh, $fn, O_RDWR|O_CREAT, 0666)) {
 770                 $fh->autoflush(1);
 771                 $msgno = $fh->getline || '0';
 772                 chomp $msgno;
 773                 $msgno++;
 774                 seek $fh, 0, 0;
 775                 $fh->print("$msgno\n");
 776                 dbg("msgno $msgno allocated for $name\n") if isdbg('msg');
 777                 $fh->close;
 778         } else {
 779                 confess "can't open $fn $!";
 780         }
 781         return $msgno;
 782 }
 783
 784 # initialise the message 'system', read in all the message headers
 785 sub init
 786 {
 787         my $dir = new IO::File;
 788         my @dir;
 789         my $ref;
 790
 791         # load various control files
 792         dbg("load badmsg: " . (load_badmsg() or "Ok"));
 793         dbg("load forward: " . (load_forward() or "Ok"));
 794         dbg("load swop: " . (load_swop() or "Ok"));
 795
 796         # read in the directory
 797         opendir($dir, $msgdir) or confess "can't open $msgdir $!";
 798         @dir = readdir($dir);
 799         closedir($dir);
 800
 801         @msg = ();
 802         for (sort @dir) {
 803                 next unless /^m\d\d\d\d\d\d$/;
 804
 805                 $ref = read_msg_header("$msgdir/$_");
 806                 unless ($ref) {
 807                         dbg("Deleting $_");
 808                         Log('err', "Deleting $_");
 809                         unlink "$msgdir/$_";
 810                         next;
 811                 }
 812
 813                 # delete any messages to 'badmsg.pl' places
 814                 if ($ref->dump_it('')) {
 815                         dbg("'Bad' TO address $ref->{to}") if isdbg('msg');
 816                         Log('msg', "'Bad' TO address $ref->{to}");
 817                         $ref->del_msg;
 818                         next;
 819                 }
 820
 821                 # add the message to the available queue
 822                 add_dir($ref);
 823         }
 824 }
 825
 826 # add the message to the directory listing
 827 sub add_dir
 828 {
 829         my $ref = shift;
 830         confess "tried to add a non-ref to the msg directory" if !ref $ref;
 831         push @msg, $ref;
 832 }
 833
 834 # return all the current messages
 835 sub get_all
 836 {
 837         return @msg;
 838 }
 839
 840 # get a particular message
 841 sub get
 842 {
 843         my $msgno = shift;
 844         for (@msg) {
 845                 return $_ if $_->{msgno} == $msgno;
 846                 last if $_->{msgno} > $msgno;
 847         }
 848         return undef;
 849 }
 850
 851 # return the official filename for a message no
 852 sub filename
 853 {
 854         return sprintf "$msgdir/m%06d", shift;
 855 }
 856
 857 #
 858 # return a list of valid elements
 859 #
 860
 861 sub fields
 862 {
 863         return keys(%valid);
 864 }
 865
 866 #
 867 # return a prompt for a field
 868 #
 869
 870 sub field_prompt
 871 {
 872         my ($self, $ele) = @_;
 873         return $valid{$ele};
 874 }
 875
 876 #
 877 # send a message state machine
 878 sub do_send_stuff
 879 {
 880         my $self = shift;
 881         my $line = shift;
 882         my @out;
 883
 884         if ($self->state eq 'send1') {
 885                 #  $DB::single = 1;
 886                 confess "local var gone missing" if !ref $self->{loc};
 887                 my $loc = $self->{loc};
 888                 if (my @ans = BadWords::check($line)) {
 889                         $self->{badcount} += @ans;
 890                         Log('msg', $self->call . " used badwords: @ans to @{$loc->{to}} in msg");
 891                         return ($self->msg('e17', @ans), $self->msg('m1'));
 892                 }
 893                 $loc->{subject} = $line;
 894                 $loc->{lines} = [];
 895                 $self->state('sendbody');
 896                 #push @out, $self->msg('sendbody');
 897                 push @out, $self->msg('m8');
 898         } elsif ($self->state eq 'sendbody') {
 899                 confess "local var gone missing" if !ref $self->{loc};
 900                 my $loc = $self->{loc};
 901                 if ($line eq "\032" || $line eq '%1A' || uc $line eq "/EX") {
 902                         my $to;
 903
 904                         foreach $to (@{$loc->{to}}) {
 905                                 my $ref;
 906                                 my $systime = $main::systime;
 907                                 my $mycall = $main::mycall;
 908                                 $ref = DXMsg->alloc(DXMsg::next_transno('Msgno'),
 909                                                                         uc $to,
 910                                                                         exists $loc->{from} ? $loc->{from} : $self->call,
 911                                                                         $systime,
 912                                                                         $loc->{private},
 913                                                                         $loc->{subject},
 914                                                                         exists $loc->{origin} ? $loc->{origin} : $mycall,
 915                                                                         '0',
 916                                                                         $loc->{rrreq});
 917                                 $ref->swop_it($self->call);
 918                                 $ref->store($loc->{lines});
 919                                 $ref->add_dir();
 920                                 push @out, $self->msg('m11', $ref->{msgno}, $to);
 921                                 #push @out, "msgno $ref->{msgno} sent to $to";
 922                                 my $dxchan = DXChannel->get(uc $to);
 923                                 if ($dxchan) {
 924                                         if ($dxchan->is_user()) {
 925                                                 $dxchan->send($dxchan->msg('m9'));
 926                                         }
 927                                 }
 928                         }
 929
 930                         delete $loc->{lines};
 931                         delete $loc->{to};
 932                         delete $self->{loc};
 933                         $self->func(undef);
 934
 935                         $self->state('prompt');
 936                 } elsif ($line eq "\031" || uc $line eq "/ABORT" || uc $line eq "/QUIT") {
 937                         #push @out, $self->msg('sendabort');
 938                         push @out, $self->msg('m10');
 939                         delete $loc->{lines};
 940                         delete $loc->{to};
 941                         delete $self->{loc};
 942                         $self->func(undef);
 943                         $self->state('prompt');
 944                 } else {
 945                         if (my @ans = BadWords::check($line)) {
 946                                 $self->{badcount} += @ans;
 947                                 Log('msg', $self->call . " used badwords: @ans to @{$loc->{to}} subject: '$loc->{subject}' in msg");
 948                                 Log('msg', "line: $line");
 949                                 return ($self->msg('e17', @ans));
 950                         }
 951
 952                         # i.e. it ain't and end or abort, therefore store the line
 953                         push @{$loc->{lines}}, length($line) > 0 ? $line : " ";
 954                 }
 955         }
 956         return @out;
 957 }
 958
 959 # return the standard directory line for this ref
 960 sub dir
 961 {
 962         my $ref = shift;
 963         return sprintf "%6d%s%s%5d %8.8s %8.8s %-6.6s %5.5s %-30.30s",
 964                 $ref->msgno, $ref->read ? '-' : ' ', $ref->private ? 'p' : ' ', $ref->size,
 965                         $ref->to, $ref->from, cldate($ref->t), ztime($ref->t), $ref->subject;
 966 }
 967
 968 # load the forward table
 969 sub load_forward
 970 {
 971         my @out;
 972         my $s = readfilestr($forwardfn);
 973         if ($s) {
 974                 eval $s;
 975                 push @out, $@ if $@;
 976         }
 977         return @out;
 978 }
 979
 980 # load the bad message table
 981 sub load_badmsg
 982 {
 983         my @out;
 984         my $s = readfilestr($badmsgfn);
 985         if ($s) {
 986                 eval $s;
 987                 push @out, $@ if $@;
 988         }
 989         return @out;
 990 }
 991
 992 # load the swop message table
 993 sub load_swop
 994 {
 995         my @out;
 996         my $s = readfilestr($swopfn);
 997         if ($s) {
 998                 eval $s;
 999                 push @out, $@ if $@;
1000         }
1001         return @out;
1002 }
1003
1004 #
1005 # forward that message or not according to the forwarding table
1006 # returns 1 for forward, 0 - to ignore
1007 #
1008
1009 sub forward_it
1010 {
1011         my $ref = shift;
1012         my $call = shift;
1013         my $i;
1014
1015         for ($i = 0; $i < @forward; $i += 5) {
1016                 my ($sort, $field, $pattern, $action, $bbs) = @forward[$i..($i+4)];
1017                 my $tested;
1018
1019                 # are we interested?
1020                 next if $ref->{private} && $sort ne 'P';
1021                 next if !$ref->{private} && $sort ne 'B';
1022
1023                 # select field
1024                 $tested = $ref->{to} if $field eq 'T';
1025                 $tested = $ref->{from} if $field eq 'F';
1026                 $tested = $ref->{origin} if $field eq 'O';
1027                 $tested = $ref->{subject} if $field eq 'S';
1028
1029                 if (!$pattern || $tested =~ m{$pattern}i) {
1030                         return 0 if $action eq 'I';
1031                         return 1 if !$bbs || grep $_ eq $call, @{$bbs};
1032                 }
1033         }
1034         return 0;
1035 }
1036
1037 sub dump_it
1038 {
1039         my $ref = shift;
1040         my $call = shift;
1041         my $i;
1042
1043         for ($i = 0; $i < @badmsg; $i += 3) {
1044                 my ($sort, $field, $pattern) = @badmsg[$i..($i+2)];
1045                 my $tested;
1046
1047                 # are we interested?
1048                 next if $ref->{private} && $sort ne 'P';
1049                 next if !$ref->{private} && $sort ne 'B';
1050
1051                 # select field
1052                 $tested = $ref->{to} if $field eq 'T';
1053                 $tested = $ref->{from} if $field eq 'F';
1054                 $tested = $ref->{origin} if $field eq 'O';
1055                 $tested = $ref->{subject} if $field eq 'S';
1056                 $tested = $call if $field eq 'I';
1057
1058                 if (!$pattern || $tested =~ m{$pattern}i) {
1059                         return 1;
1060                 }
1061         }
1062         return 0;
1063 }
1064
1065 sub swop_it
1066 {
1067         my $ref = shift;
1068         my $call = shift;
1069         my $i;
1070         my $count = 0;
1071
1072         for ($i = 0; $i < @swop; $i += 5) {
1073                 my ($sort, $field, $pattern, $tfield, $topattern) = @swop[$i..($i+4)];
1074                 my $tested;
1075                 my $swop;
1076                 my $old;
1077
1078                 # are we interested?
1079                 next if $ref->{private} && $sort ne 'P';
1080                 next if !$ref->{private} && $sort ne 'B';
1081
1082                 # select field
1083                 $tested = $ref->{to} if $field eq 'T';
1084                 $tested = $ref->{from} if $field eq 'F';
1085                 $tested = $ref->{origin} if $field eq 'O';
1086                 $tested = $ref->{subject} if $field eq 'S';
1087
1088                 # select swop field
1089                 $old = $swop = $ref->{to} if $tfield eq 'T';
1090                 $old = $swop = $ref->{from} if $tfield eq 'F';
1091                 $old = $swop = $ref->{origin} if $tfield eq 'O';
1092                 $old = $swop = $ref->{subject} if $tfield eq 'S';
1093
1094                 if ($tested =~ m{$pattern}i) {
1095                         if ($tested eq $swop) {
1096                                 $swop =~ s{$pattern}{$topattern}i;
1097                         } else {
1098                                 $swop = $topattern;
1099                         }
1100                         Log('msg', "Msg $ref->{msgno}: $tfield $old -> $swop");
1101                         Log('dbg', "Msg $ref->{msgno}: $tfield $old -> $swop");
1102                         $ref->{to} = $swop if $tfield eq 'T';
1103                         $ref->{from} = $swop if $tfield eq 'F';
1104                         $ref->{origin} = $swop if $tfield eq 'O';
1105                         $ref->{subject} = $swop if $tfield eq 'S';
1106                         ++$count;
1107                 }
1108         }
1109         return $count;
1110 }
1111
1112 # import any msgs in the import directory
1113 # the messages are in BBS format (but may have cluster extentions
1114 # so SB UK < GB7TLH is legal
1115 sub import_msgs
1116 {
1117         # are there any to do in this directory?
1118         return unless -d $importfn;
1119         unless (opendir(DIR, $importfn)) {
1120                 dbg("can\'t open $importfn $!") if isdbg('msg');
1121                 Log('msg', "can\'t open $importfn $!");
1122                 return;
1123         }
1124
1125         my @names = readdir(DIR);
1126         closedir(DIR);
1127         my $name;
1128         foreach $name (@names) {
1129                 next if $name =~ /^\./;
1130                 my $splitit = $name =~ /^split/;
1131                 my $fn = "$importfn/$name";
1132                 next unless -f $fn;
1133                 unless (open(MSG, $fn)) {
1134                         dbg("can\'t open import file $fn $!") if isdbg('msg');
1135                         Log('msg', "can\'t open import file $fn $!");
1136                         unlink($fn);
1137                         next;
1138                 }
1139                 my @msg = map { chomp; $_ } <MSG>;
1140                 close(MSG);
1141                 unlink($fn);
1142                 my @out = import_one($main::me, \@msg, $splitit);
1143                 Log('msg', @out);
1144         }
1145 }
1146
1147 # import one message as a list in bbs (as extended) mode
1148 # takes a reference to an array containing the whole message
1149 sub import_one
1150 {
1151         my $dxchan = shift;
1152         my $ref = shift;
1153         my $splitit = shift;
1154         my $private = '1';
1155         my $rr = '0';
1156         my $notincalls = 1;
1157         my $from = $dxchan->call;
1158         my $origin = $main::mycall;
1159         my @to;
1160         my @out;
1161
1162         # first line;
1163         my $line = shift @$ref;
1164         my @f = split /\s+/, $line;
1165         unless (@f && $f[0] =~ /^(:?S|SP|SB|SEND)$/ ) {
1166                 my $m = "invalid first line in import '$line'";
1167                 dbg($m) if isdbg('msg');
1168                 return (1, $m);
1169         }
1170         while (@f) {
1171                 my $f = uc shift @f;
1172                 next if $f eq 'SEND';
1173
1174                 # private / noprivate / rr
1175                 if ($notincalls && ($f eq 'B' || $f eq 'SB' || $f =~ /^NOP/oi)) {
1176                         $private = '0';
1177                 } elsif ($notincalls && ($f eq 'P' || $f eq 'SP' || $f =~ /^PRI/oi)) {
1178                         ;
1179                 } elsif ($notincalls && ($f eq 'RR')) {
1180                         $rr = '1';
1181                 } elsif ($f eq '@' && @f) {       # this is bbs syntax, for origin
1182                         $origin = uc shift @f;
1183                 } elsif ($f eq '<' && @f) {     # this is bbs syntax  for from call
1184                         $from = uc shift @f;
1185                 } elsif ($f =~ /^\$/) {     # this is bbs syntax  for a bid
1186                         next;
1187                 } elsif ($f =~ /^<\S+/) {     # this is bbs syntax  for from call
1188                         ($from) = $f =~ /^<(\S+)$/;
1189                 } elsif ($f =~ /^\@\S+/) {     # this is bbs syntax for origin
1190                         ($origin) = $f =~ /^\@(\S+)$/;
1191                 } else {
1192
1193                         # callsign ?
1194                         $notincalls = 0;
1195
1196                         # is this callsign a distro?
1197                         my $fn = "$msgdir/distro/$f.pl";
1198                         if (-e $fn) {
1199                                 my $fh = new IO::File $fn;
1200                                 if ($fh) {
1201                                         local $/ = undef;
1202                                         my $s = <$fh>;
1203                                         $fh->close;
1204                                         my @call;
1205                                         @call = eval $s;
1206                                         return (1, "Error in Distro $f.pl:", $@) if $@;
1207                                         if (@call > 0) {
1208                                                 push @f, @call;
1209                                                 next;
1210                                         }
1211                                 }
1212                         }
1213
1214                         if (grep $_ eq $f, @DXMsg::badmsg) {
1215                                 push @out, $dxchan->msg('m3', $f);
1216                         } else {
1217                                 push @to, $f;
1218                         }
1219                 }
1220         }
1221
1222         # subject is the next line
1223         my $subject = shift @$ref;
1224
1225         # strip off trailing lines
1226         pop @$ref while (@$ref && $$ref[-1] =~ /^\s*$/);
1227
1228         # strip off /EX or /ABORT
1229         return ("aborted") if @$ref && $$ref[-1] =~ m{^/ABORT$}i;
1230         pop @$ref if (@$ref && $$ref[-1] =~ m{^/EX$}i);
1231
1232         # sort out any splitting that needs to be done
1233         my @chunk;
1234         if ($splitit) {
1235                 my $lth = 0;
1236                 my $lines = [];
1237                 for (@$ref) {
1238                         if ($lth >= $maxchunk || ($lth > $minchunk && /^\s*$/)) {
1239                                 push @chunk, $lines;
1240                                 $lines = [];
1241                                 $lth = 0;
1242                         }
1243                         push @$lines, $_;
1244                         $lth += length;
1245                 }
1246                 push @chunk, $lines if @$lines;
1247         } else {
1248                 push @chunk, $ref;
1249         }
1250
1251     # write all the messages away
1252         my $i;
1253         for ( $i = 0;  $i < @chunk; $i++) {
1254                 my $chunk = $chunk[$i];
1255                 my $ch_subject;
1256                 if (@chunk > 1) {
1257                         my $num = " [" . ($i+1) . "/" . scalar @chunk . "]";
1258                         $ch_subject = substr($subject, 0, 27 - length $num) .  $num;
1259                 } else {
1260                         $ch_subject = $subject;
1261                 }
1262                 my $to;
1263                 foreach $to (@to) {
1264                         my $systime = $main::systime;
1265                         my $mycall = $main::mycall;
1266                         my $mref = DXMsg->alloc(DXMsg::next_transno('Msgno'),
1267                                                                         $to,
1268                                                                         $from,
1269                                                                         $systime,
1270                                                                         $private,
1271                                                                         $ch_subject,
1272                                                                         $origin,
1273                                                                         '0',
1274                                                                         $rr);
1275                         $mref->swop_it($main::mycall);
1276                         $mref->store($chunk);
1277                         $mref->add_dir();
1278                         push @out, $dxchan->msg('m11', $mref->{msgno}, $to);
1279                         #push @out, "msgno $ref->{msgno} sent to $to";
1280                         my $todxchan = DXChannel->get(uc $to);
1281                         if ($todxchan) {
1282                                 if ($todxchan->is_user()) {
1283                                         $todxchan->send($todxchan->msg('m9'));
1284                                 }
1285                         }
1286                 }
1287         }
1288         return @out;
1289 }
1290
1291 no strict;
1292 sub AUTOLOAD
1293 {
1294         my $self = shift;
1295         my $name = $AUTOLOAD;
1296         return if $name =~ /::DESTROY$/;
1297         $name =~ s/.*:://o;
1298
1299         confess "Non-existant field '$AUTOLOAD'" if !$valid{$name};
1300         # this clever line of code creates a subroutine which takes over from autoload
1301         # from OO Perl - Conway
1302         *{$AUTOLOAD} = sub {@_ > 1 ? $_[0]->{$name} = $_[1] : $_[0]->{$name}} ;
1303         @_ ? $self->{$name} = shift : $self->{$name} ;
1304 }
1305
1306 1;
1307
1308 __END__