- # handle PC90 frames in a special way.
- #
- # PC90 frames are normal frames that that are wrapped in inside a PC90
- # The extra fields are "originating node" and a sequence number.
- # The sequence number is checked against the nodes 'last one' to see if
- # it is a duplicate and, if so, is dropped at this stage; before any
- # other processing.
- #
- # This is done here simply for efficiency. Adding another function would
- # add more copying and so on.
- #
-
- my $origin = $self->call;
-
- if ($pcno >= 90) {
- $origin = $field[1];
- if ($origin eq $main::mycall) {
- dbg("PCPROT: loop dupe") if isdbg('chanerr');
- return;
- }
- my $seq = $field[2];
- my $node = Route::Node::get($origin);
- if ($node) {
- if (my $lid = $node->lid) {
- my $cmp = $seq >= $lid ? $seq : $seq + 9999;
- if ($cmp <= $lid) {
- dbg("PCPROT: sequence dupe $seq ($cmp) <= $lid") if isdbg('chanerr');
- return;
- }
- }
- $node->lid($seq);
- }
-
- # do a recheck on the contents of the PC90
- if ($pcno == 90) {
- shift @field;
- shift @field;
- shift @field;
-
- ($pcno) = $field[0] =~ /^PC(\d\d)/; # just get the number
- return unless $pcno;
- return if $pcno < 10 || $pcno > 99;
-
- # check for and dump bad protocol messages
- my $n = check($pcno, @field);
- if ($n) {
- dbg("PCPROT: bad field $n, dumped (" . parray($checklist[$pcno-10]) . ")") if isdbg('chanerr');
- return;
- }
- }
- }
-
- # local processing 1
- my $pcr;
- eval {
- $pcr = Local::pcprot($self, $pcno, @field);
- };
-# dbg("Local::pcprot error $@") if isdbg('local') if $@;
- return if $pcr;
-