+# incoming user
+sub handle_16
+{
+ my $self = shift;
+ my $pcno = shift;
+ my $line = shift;
+ my $origin = shift;
+
+ # general checks
+ my $dxchan;
+ my $ncall = $_[1];
+ my $newline = "PC16^";
+
+ # dos I want users from this channel?
+ unless ($self->user->wantpc16) {
+ dbg("PCPROT: don't send users to $self->{call}") if isdbg('chanerr');
+ return;
+ }
+ # is it me?
+ if ($ncall eq $main::mycall) {
+ dbg("PCPROT: trying to alter config on this node from outside!") if isdbg('chanerr');
+ return;
+ }
+
+ RouteDB::update($ncall, $self->{call});
+
+ # do we believe this call?
+ unless ($ncall eq $self->{call} || $self->is_believed($ncall)) {
+ if (my $ivp = Investigate::get($ncall, $self->{call})) {
+ $ivp->store_pcxx($pcno,$line,$origin,@_);
+ } else {
+ dbg("PCPROT: We don't believe $ncall on $self->{call}") if isdbg('chanerr');
+ }
+ return;
+ }
+
+ if (eph_dup($line)) {
+ dbg("PCPROT: dup PC16 detected") if isdbg('chanerr');
+ return;
+ }
+
+ my $parent = Route::Node::get($ncall);
+
+ # if there is a parent, proceed, otherwise if there is a latent PC19 in the PC19list,
+ # fix it up in the routing tables and issue it forth before the PC16
+ unless ($parent) {
+ my $nl = $pc19list{$ncall};
+
+ if ($nl && @_ > 3) { # 3 because of the hop count!
+
+ # this is a new (remembered) node, now attach it to me if it isn't in filtered
+ # and we haven't disallowed it
+ my $user = DXUser->get_current($ncall);
+ if (!$user) {
+ $user = DXUser->new($ncall);
+ $user->sort('A');
+ $user->priv(1); # I have relented and defaulted nodes
+ $user->lockout(1);
+ $user->homenode($ncall);
+ $user->node($ncall);
+ }
+
+ my $wantpc19 = $user->wantroutepc19;
+ if ($wantpc19 || !defined $wantpc19) {
+ my $new = Route->new($ncall); # throw away
+ if ($self->in_filter_route($new)) {
+ my @nrout;
+ for (@$nl) {
+ $parent = Route::Node::get($_->[0]);
+ $dxchan = $parent->dxchan if $parent;
+ if ($dxchan && $dxchan ne $self) {
+ dbg("PCPROT: PC19 from $self->{call} trying to alter locally connected $ncall, ignored!") if isdbg('chanerr');
+ $parent = undef;
+ }
+ if ($parent) {
+ my $r = $parent->add($ncall, $_->[1], $_->[2]);
+ push @nrout, $r unless @nrout;
+ }
+ }
+ $user->wantroutepc19(1) unless defined $wantpc19; # for now we work on the basis that pc16 = real route
+ $user->lastin($main::systime) unless DXChannel::get($ncall);
+ $user->put;
+
+ # route the pc19 - this will cause 'stuttering PC19s' for a while
+ $self->route_pc19($origin, $line, @nrout) if @nrout ;
+ $parent = Route::Node::get($ncall);
+ unless ($parent) {
+ dbg("PCPROT: lost $ncall after sending PC19 for it?");
+ return;
+ }
+ } else {
+ return;
+ }
+ delete $pc19list{$ncall};
+ }
+ } else {
+ dbg("PCPROT: Node $ncall not in config") if isdbg('chanerr');
+ return;
+ }
+ } else {
+
+ $dxchan = $parent->dxchan;
+ if ($dxchan && $dxchan ne $self) {
+ dbg("PCPROT: PC16 from $self->{call} trying to alter locally connected $ncall, ignored!") if isdbg('chanerr');
+ return;
+ }
+
+ # input filter if required
+ return unless $self->in_filter_route($parent);
+ }
+
+ my $i;
+ my @rout;
+ for ($i = 2; $i < $#_; $i++) {
+ my ($call, $conf, $here) = $_[$i] =~ /^(\S+) (\S) (\d)/o;
+ next unless $call && $conf && defined $here && is_callsign($call);
+ next if $call eq $main::mycall;
+
+ eph_del_regex("^PC17\\^$call\\^$ncall");
+
+ $conf = $conf eq '*';
+
+ # reject this if we think it is a node already
+ my $r = Route::Node::get($call);
+ my $u = DXUser->get_current($call) unless $r;
+ if ($r || ($u && $u->is_node)) {
+ dbg("PCPROT: $call is a node") if isdbg('chanerr');
+ next;
+ }
+
+ $r = Route::User::get($call);
+ my $flags = Route::here($here)|Route::conf($conf);
+
+ if ($r) {
+ my $au = $r->addparent($parent);
+ if ($r->flags != $flags) {
+ $r->flags($flags);
+ $au = $r;
+ }
+ push @rout, $r if $au;
+ } else {
+ push @rout, $parent->add_user($call, $flags);
+ }
+
+
+ # add this station to the user database, if required
+ $call =~ s/-\d+$//o; # remove ssid for users
+ my $user = DXUser->get_current($call);
+ $user = DXUser->new($call) if !$user;
+ $user->homenode($parent->call) if !$user->homenode;
+ $user->node($parent->call);
+ $user->lastin($main::systime) unless DXChannel::get($call);
+ $user->put;
+ }
+ $self->route_pc16($origin, $line, $parent, @rout) if @rout;
+}
+
+# remove a user
+sub handle_17
+{
+ my $self = shift;
+ my $pcno = shift;
+ my $line = shift;
+ my $origin = shift;
+ my $dxchan;
+ my $ncall = $_[2];
+ my $ucall = $_[1];
+
+ eph_del_regex("^PC16\\^$ncall.*$ucall");
+
+ # do I want users from this channel?
+ unless ($self->user->wantpc16) {
+ dbg("PCPROT: don't send users to $self->{call}") if isdbg('chanerr');
+ return;
+ }
+ if ($ncall eq $main::mycall) {
+ dbg("PCPROT: trying to alter config on this node from outside!") if isdbg('chanerr');
+ return;
+ }
+
+ RouteDB::delete($ncall, $self->{call});
+
+ # do we believe this call?
+ unless ($ncall eq $self->{call} || $self->is_believed($ncall)) {
+ if (my $ivp = Investigate::get($ncall, $self->{call})) {
+ $ivp->store_pcxx($pcno,$line,$origin,@_);
+ } else {
+ dbg("PCPROT: We don't believe $ncall on $self->{call}") if isdbg('chanerr');
+ }
+ return;
+ }
+
+ my $uref = Route::User::get($ucall);
+ unless ($uref) {
+ dbg("PCPROT: Route::User $ucall not in config") if isdbg('chanerr');
+ }
+ my $parent = Route::Node::get($ncall);
+ unless ($parent) {
+ dbg("PCPROT: Route::Node $ncall not in config") if isdbg('chanerr');
+ }
+
+ $dxchan = $parent->dxchan if $parent;
+ if ($dxchan && $dxchan ne $self) {
+ dbg("PCPROT: PC17 from $self->{call} trying to alter locally connected $ncall, ignored!") if isdbg('chanerr');
+ return;
+ }
+
+ # input filter if required and then remove user if present
+ if ($parent) {
+# return unless $self->in_filter_route($parent);
+ $parent->del_user($uref) if $uref;
+ } else {
+ $parent = Route->new($ncall); # throw away
+ }
+
+ if (eph_dup($line)) {
+ dbg("PCPROT: dup PC17 detected") if isdbg('chanerr');
+ return;
+ }
+
+ $uref = Route->new($ucall) unless $uref; # throw away
+ $self->route_pc17($origin, $line, $parent, $uref);
+}
+
+# link request
+sub handle_18
+{
+ my $self = shift;
+ my $pcno = shift;
+ my $line = shift;
+ my $origin = shift;
+ $self->state('init');
+
+ # record the type and version offered
+ if ($_[1] =~ /DXSpider Version: (\d+\.\d+) Build: (\d+\.\d+)/) {
+ $self->version(53 + $1);
+ $self->user->version(53 + $1);
+ $self->build(0 + $2);
+ $self->user->build(0 + $2);
+ unless ($self->is_spider) {
+ $self->user->sort('S');
+ $self->user->put;
+ $self->sort('S');
+ }
+ $self->{handle_xml}++ if $main::do_xml && $_[1] =~ /\bxml\b/;
+ } else {
+ $self->version(50.0);
+ $self->version($_[2] / 100) if $_[2] && $_[2] =~ /^\d+$/;
+ $self->user->version($self->version);
+ }
+
+ # first clear out any nodes on this dxchannel
+ my $parent = Route::Node::get($self->{call});
+ my @rout = $parent->del_nodes;
+ $self->route_pc21($origin, $line, @rout, $parent) if @rout;
+ $self->send_local_config();
+ $self->send(pc20());
+}
+
+# incoming cluster list
+sub handle_19
+{
+ my $self = shift;
+ my $pcno = shift;
+ my $line = shift;
+ my $origin = shift;
+
+ my $i;
+ my $newline = "PC19^";
+
+ # new routing list
+ my @rout;
+
+ # first get the INTERFACE node
+ my $parent = Route::Node::get($self->{call});
+ unless ($parent) {
+ dbg("DXPROT: my parent $self->{call} has disappeared");
+ $self->disconnect;
+ return;
+ }
+
+ # if the origin isn't the same as the INTERFACE, then reparent, creating nodes as necessary
+ if ($origin ne $self->call) {
+ my $op = Route::Node::get($origin);
+ unless ($op) {
+ $op = $parent->add($origin, 5000, Route::here(1));
+ my $user = DXUser->get_current($origin);
+ if (!$user) {
+ $user = DXUser->new($origin);
+ $user->priv(1); # I have relented and defaulted nodes
+ $user->lockout(1);
+ $user->homenode($origin);
+ $user->node($origin);
+ $user->wantroutepc19(1);
+ }
+ $user->sort('A') unless $user->is_node;
+ $user->put;
+ }
+ $parent = $op;
+ }
+
+ # parse the PC19
+ for ($i = 1; $i < $#_-1; $i += 4) {
+ my $here = $_[$i];
+ my $call = uc $_[$i+1];
+ my $conf = $_[$i+2];
+ my $ver = $_[$i+3];
+ next unless defined $here && defined $conf && is_callsign($call);
+
+ eph_del_regex("^PC(?:21\\^$call|17\\^[^\\^]+\\^$call)");
+
+ # check for sane parameters
+ # $ver = 5000 if $ver eq '0000';
+ next if $ver < 5000; # only works with version 5 software
+ next if length $call < 3; # min 3 letter callsigns
+ next if $call eq $main::mycall;
+
+ # check that this PC19 isn't trying to alter the wrong dxchan
+ my $dxchan = DXChannel::get($call);
+ if ($dxchan && $dxchan != $self) {
+ dbg("PCPROT: PC19 from $self->{call} trying to alter wrong locally connected $call, ignored!") if isdbg('chanerr');
+ next;
+ }
+
+ # add this station to the user database, if required (don't remove SSID from nodes)
+ my $user = DXUser->get_current($call);
+ if (!$user) {
+ $user = DXUser->new($call);
+ $user->priv(1); # I have relented and defaulted nodes
+ $user->lockout(1);
+ $user->homenode($call);
+ $user->node($call);
+ }
+ $user->sort('A') unless $user->is_node;
+
+ RouteDB::update($call, $self->{call});
+
+ # do we believe this call?
+ my $genline = "PC19^$here^$call^$conf^$ver^$_[-1]^";
+ unless ($call eq $self->{call} || $self->is_believed($call)) {
+ my $pt = $user->lastping($self->{call}) || 0;
+ if ($pt+$investigation_int < $main::systime && !Investigate::get($call, $self->{call})) {
+ my $ivp = Investigate->new($call, $self->{call});
+ $ivp->version($ver);
+ $ivp->here($here);
+ $ivp->store_pcxx($pcno,$genline,$origin,'PC19',$here,$call,$conf,$ver,$_[-1]);
+ } else {
+ dbg("PCPROT: We don't believe $call on $self->{call}") if isdbg('chanerr');
+ }
+ $user->put;
+ next;
+ }
+
+ if (eph_dup($genline)) {
+ dbg("PCPROT: dup PC19 for $call detected") if isdbg('chanerr');
+ next;
+ }
+
+ my $r = Route::Node::get($call);
+ my $flags = Route::here($here)|Route::conf($conf);
+
+ # modify the routing table if it is in it, otherwise store it in the pc19list for now
+ if ($r) {
+ my $ar;
+ if ($call ne $parent->call) {
+ if ($self->in_filter_route($r)) {
+ $ar = $parent->add($call, $ver, $flags);
+ push @rout, $ar if $ar;
+ } else {
+ next;
+ }
+ }
+ if ($r->version ne $ver || $r->flags != $flags) {
+ $r->version($ver);
+ $r->flags($flags);
+ push @rout, $r unless $ar;
+ }
+ } else {
+
+ # if he is directly connected or allowed then add him, otherwise store him up for later
+ if ($call eq $self->{call} || $user->wantroutepc19) {
+ my $new = Route->new($call); # throw away
+ if ($self->in_filter_route($new)) {
+ my $ar = $parent->add($call, $ver, $flags);
+ $user->wantroutepc19(1) unless defined $user->wantroutepc19;
+ push @rout, $ar if $ar;
+ } else {
+ next;
+ }
+ } else {
+ $pc19list{$call} = [] unless exists $pc19list{$call};
+ my $nl = $pc19list{$call};
+ push @{$pc19list{$call}}, [$self->{call}, $ver, $flags] unless grep $_->[0] eq $self->{call}, @$nl;
+ }
+ }
+
+ # unbusy and stop and outgoing mail (ie if somehow we receive another PC19 without a disconnect)
+ my $mref = DXMsg::get_busy($call);
+ $mref->stop_msg($call) if $mref;
+
+ $user->lastin($main::systime) unless DXChannel::get($call);
+ $user->put;
+ }
+
+
+ $self->route_pc19($origin, $line, @rout) if @rout;
+}
+
+# send local configuration
+sub handle_20
+{
+ my $self = shift;
+ my $pcno = shift;
+ my $line = shift;
+ my $origin = shift;
+ $self->send_local_config();
+ $self->send(pc22());
+ $self->state('normal');
+ $self->{lastping} = 0;
+}
+
+# delete a cluster from the list
+sub handle_21
+{
+ my $self = shift;
+ my $pcno = shift;
+ my $line = shift;
+ my $origin = shift;
+ my $call = uc $_[1];
+
+ eph_del_regex("^PC1[679].*$call");
+
+ # if I get a PC21 from the same callsign as self then treat it
+ # as a PC39: I have gone away
+ if ($call eq $self->call) {
+ $self->disconnect(1);
+ return;
+ }
+
+ RouteDB::delete($call, $self->{call});
+
+ # check if we believe this
+ unless ($call eq $self->{call} || $self->is_believed($call)) {
+ if (my $ivp = Investigate::get($call, $self->{call})) {
+ $ivp->store_pcxx($pcno,$line,$origin,@_);
+ } else {
+ dbg("PCPROT: We don't believe $call on $self->{call}") if isdbg('chanerr');
+ }
+ return;
+ }
+
+ # check to see if we are in the pc19list, if we are then don't bother with any of
+ # this routing table manipulation, just remove it from the list and dump it
+ my @rout;
+ if (my $nl = $pc19list{$call}) {
+ $pc19list{$call} = [ grep {$_->[0] ne $self->{call}} @$nl ];
+ delete $pc19list{$call} unless @{$pc19list{$call}};
+ } else {
+
+ my $parent = Route::Node::get($self->{call});
+ unless ($parent) {
+ dbg("DXPROT: my parent $self->{call} has disappeared");
+ $self->disconnect;
+ return;
+ }
+ if ($call ne $main::mycall) { # don't allow malicious buggers to disconnect me!
+ my $node = Route::Node::get($call);
+ if ($node) {
+
+ my $dxchan = DXChannel::get($call);
+ if ($dxchan && $dxchan != $self) {
+ dbg("PCPROT: PC21 from $self->{call} trying to alter locally connected $call, ignored!") if isdbg('chanerr');
+ return;
+ }
+
+ # input filter it
+ return unless $self->in_filter_route($node);
+
+ # routing objects
+ push @rout, $node->del($parent);
+ }
+ } else {
+ dbg("PCPROT: I WILL _NOT_ be disconnected!") if isdbg('chanerr');