2 # This class is the internal subclass that deals with AGW Engine connections
4 # The complication here is that there only one 'real' (and from the node's point
5 # of view, invisible) IP connection. This connection then has multiplexed
6 # connections passed down it, a la BPQ native host ports (but not as nicely).
8 # It is a shame that the author has chosen an inherently dangerous binary format
9 # which is non-framed and has the potential for getting out of sync and not
10 # being able to recover. Relying on length fields is recipe for disaster (esp.
11 # for him!). DoS attacks are a wonderful thing....
13 # Also making the user handle the distinction between a level 2 and 4 connection
14 # and especially Digis, in the way that he has, is a bit of a cop out! If I can
15 # be arsed to do anything other than straight ax25 connects then it will only
16 # because I have the 'power of perl' available that avoids me getting
17 # terminally bored sorting out other people's sloppyness.
21 # Copyright (c) 2001 - Dirk Koopman G1TLH
32 use vars qw(@ISA $sock @outqueue $send_offset $inmsg $rproc $noports $lastytime
33 $lasthtime $ypolltime $hpolltime %circuit $total_in $total_out);
35 @ISA = qw(Msg ExtMsg);
42 $lastytime = $lasthtime = time;
43 $ypolltime = 10 unless defined $ypolltime;
44 $hpolltime = 300 unless defined $hpolltime;
46 $total_in = $total_out = 0;
50 return unless $enable;
54 dbg("AGW initialising and connecting to $addr/$port ...");
55 $sock = IO::Socket::INET->new(PeerAddr => $addr, PeerPort => $port, Proto=>'tcp', Timeout=>15);
57 dbg("Cannot connect to AGW Engine at $addr/$port $!");
60 Msg::blocking($sock, 0);
61 Msg::set_event_handler($sock, read=>\&_rcv, error=>\&_error);
63 # send a P frame for the login if required
65 my $data = pack "a255 a255", $login, $passwd;
66 _sendf('P', undef, undef, undef, undef, $data);
70 # R frame for the release number
71 # G frame to ask for ports
72 # X frame to say who we are
73 # optional m frame to enable monitoring
76 _sendf('X', $main::mycall);
77 _sendf('m') if $monitor;
88 for (values %circuit) {
89 &{$_->{eproc}}() if $_->{eproc};
93 _sendf('m') if $monitor;
94 _sendf('x', $main::mycall);
96 Msg::set_event_handler($sock, read=>undef, write=>undef, error=>undef);
103 goto &main::login; # save some writing, this was the default
113 my $sort = shift || confess "need a valid AGW command letter";
114 my $from = shift || '';
115 my $to = shift || '';
116 my $port = shift || 0;
117 my $pid = shift || 0;
118 my $data = shift || '';
122 if ($sort eq 'y' || $sort eq 'H') {
123 dbg("AGW sendf: $sort '${from}'->'${to}' port: $port pid: $pid \"$data\"") if isdbg('agwpoll');
124 } elsif ($sort eq 'D') {
128 dbg("AGW sendf: $sort '${from}'->'${to}' port: $port pid: $pid \"$d\"") if isdbg('agw');
131 dbg("AGW sendf: $sort '${from}'->'${to}' port: $port pid: $pid \"$data\"") if isdbg('agw');
133 push @outqueue, pack('C x3 a1 x1 C x1 a10 a10 V x4 a*', $port, $sort, $pid, $from, $to, $len, $data);
134 Msg::set_event_handler($sock, write=>\&_send);
141 # If $flush is set, set the socket to blocking, and send all
142 # messages in the queue - return only if there's an error
143 # If $flush is 0 (deferred mode) make the socket non-blocking, and
144 # return to the event loop only after every message, or if it
145 # is likely to block in the middle of a message.
147 my $offset = $send_offset;
150 my $msg = $outqueue[0];
151 my $mlth = length($msg);
152 my $bytes_to_write = $mlth - $offset;
153 my $bytes_written = 0;
154 confess("Negative Length! msg: '$msg' lth: $mlth offset: $offset") if $bytes_to_write < 0;
155 while ($bytes_to_write > 0) {
156 $bytes_written = syswrite ($sock, $msg,
157 $bytes_to_write, $offset);
158 if (!defined($bytes_written)) {
159 if (Msg::_err_will_block($!)) {
160 # Should happen only in deferred mode. Record how
161 # much we have already sent.
162 $send_offset = $offset;
163 # Event handler should already be set, so we will
164 # be called back eventually, and will resume sending
168 return 0; # fail. Message remains in queue ..
172 dbgdump('raw', "AGW send $bytes_written: ", $msg);
174 $total_out += $bytes_written;
175 $offset += $bytes_written;
176 $bytes_to_write -= $bytes_written;
178 $send_offset = $offset = 0;
180 last; # Go back to select and wait
181 # for it to fire again.
184 # Call me back if queue has not been drained.
186 Msg::set_event_handler ($sock, write => \&_send);
188 Msg::set_event_handler ($sock, write => undef);
193 sub _rcv { # Complement to _send
195 my ($msg, $offset, $bytes_read);
197 $bytes_read = sysread ($sock, $msg, 1024, 0);
198 if (defined ($bytes_read)) {
199 if ($bytes_read > 0) {
200 $total_in += $bytes_read;
203 dbgdump('raw', "AGW read $bytes_read: ", $msg);
207 if (Msg::_err_will_block($!)) {
215 if (defined $bytes_read && $bytes_read == 0) {
218 _decode() if length $inmsg >= 36;
224 dbg("error on AGW connection $addr/$port $!");
225 Msg::set_event_handler($sock, read=>undef, write=>undef, error=>undef);
228 &{$_->{eproc}}() if $_->{eproc};
237 # we have at least 36 bytes of data (ugh!)
238 while (length $inmsg >= 36) {
239 my ($port, $sort, $pid, $from, $to, $len) = unpack('C x3 a1 x1 C x1 Z10 Z10 V x4', $inmsg);
242 # do a sanity check on the length
244 dbg("AGW: invalid length $len > 2000 received ($sort $port $pid '$from'->'$to')");
249 if (length $inmsg > 36) {
250 $inmsg = substr($inmsg, 36);
254 } elsif (length $inmsg > $len + 36) {
255 $data = substr($inmsg, 36, $len);
256 $inmsg = substr($inmsg, $len + 36);
257 } elsif (length $inmsg == $len + 36) {
258 $data = substr($inmsg, 36);
262 # we don't have enough data or something
263 # or we have screwed up
268 $data = '' unless defined $data;
270 my $d = unpack "Z*", $data;
273 dbg("AGW Data In port: $port pid: $pid '$from'->'$to' length: $len \"$d\"") if isdbg('agw');
274 my $conn = _find($from eq $main::mycall ? $to : $from);
276 if ($conn->{state} eq 'WC') {
277 if (exists $conn->{cmd}) {
278 if (@{$conn->{cmd}}) {
279 dbg($d) if isdbg('connect');
283 if ($conn->{state} eq 'WC' && exists $conn->{cmd} && @{$conn->{cmd}} == 0) {
284 $conn->to_connected($conn->{call}, 'O', $conn->{csort});
287 my @lines = split /\cM\cJ?/, $d;
288 push @lines, $d unless @lines;
290 &{$conn->{rproc}}($conn, "I$conn->{call}|$_");
294 dbg("AGW error Unsolicited Data!");
296 } elsif ($sort eq 'I' || $sort eq 'S' || $sort eq 'U' || $sort eq 'M' || $sort eq 'T') {
297 my $d = unpack "Z*", $data;
300 my @lines = split /\cM\cJ?/, $d;
303 # s/([\x00-\x1f\x7f-\xff])/sprintf("%%%02X", ord($1))/eg;
304 dbg("AGW Monitor port: $port \"$_\"") if isdbg('agw');
306 } elsif ($sort eq 'C') {
307 my $d = unpack "Z*", $data;
309 dbg("AGW Connect port: $port pid: $pid '$from'->'$to' \"$d\"") if isdbg('agw');
310 my $call = $from eq $main::mycall ? $to : $from;
311 my $conn = _find($call);
313 if ($conn->{state} eq 'WC') {
314 if (exists $conn->{cmd} && @{$conn->{cmd}}) {
316 if ($conn->{state} eq 'WC' && exists $conn->{cmd} && @{$conn->{cmd}} == 0) {
317 $conn->to_connected($conn->{call}, 'O', $conn->{csort});
322 $conn = AGWMsg->new($rproc);
323 $conn->{agwpid} = $pid;
324 $conn->{agwport} = $port;
325 $conn->{lineend} = "\cM";
326 $conn->{incoming} = 1;
327 $conn->{agwcall} = $call;
328 $circuit{$call} = $conn;
329 if (my ($c, $s) = $call =~ /^(\w+)-(\d\d?)$/) {
330 $s = 15 - $s if $s > 8;
331 $call = $s > 0 ? "${c}-${s}" : $c;
333 $conn->to_connected($call, 'A', $conn->{csort} = 'ax25');
335 } elsif ($sort eq 'd') {
336 my $d = unpack "Z*", $data;
338 dbg("AGW '$from'->'$to' port: $port Disconnected ($d)") if isdbg('agw');
339 my $conn = _find($from eq $main::mycall ? $to : $from);
341 &{$conn->{eproc}}() if $conn->{eproc};
342 $conn->in_disconnect;
344 } elsif ($sort eq 'y') {
345 my ($frames) = unpack "V", $data;
346 dbg("AGW Frames Outstanding on port $port = $frames") if isdbg('agwpollans');
347 my $conn = _find($from);
348 $conn->{oframes} = $frames if $conn;
349 } elsif ($sort eq 'Y') {
350 my ($frames) = unpack "V", $data;
351 dbg("AGW Frames Outstanding on circuit '$from'->'$to' = $frames") if isdbg('agw');
352 my $conn = _find($from eq $main::mycall ? $to : $from);
353 $conn->{oframes} = $frames if $conn;
354 } elsif ($sort eq 'H') {
355 unless ($from =~ /^\s+$/) {
356 my $d = unpack "Z*", $data;
358 dbg("AGW Heard port: $port \"$d\"") if isdbg('agw');
360 } elsif ($sort eq 'X') {
361 my ($r) = unpack "C", $data;
362 $r = $r ? "Successful" : "Failed";
363 dbg("AGW Register $from $r");
365 } elsif ($sort eq 'R') {
366 my ($major, $minor) = unpack "v x2 v x2", $data;
367 dbg("AGW Version $major.$minor") if isdbg('agw');
368 } elsif ($sort eq 'G') {
369 my @ports = split /;/, $data;
370 $noports = shift @ports || '0';
371 dbg("AGW $noports Ports available") if isdbg('agw');
372 pop @ports while @ports > $noports;
375 dbg("AGW Port: $_") if isdbg('agw');
377 for (my $i = 0; $i < $noports; $i++) {
378 _sendf('y', undef, undef, $i);
379 _sendf('g', undef, undef, $i);
382 my $d = unpack "Z*", $data;
383 dbg("AGW decode $sort port: $port pid: $pid '$from'->'$to' length: $len \"$d\"") if isdbg('agw');
391 return $circuit{$call};
396 my ($conn, $line) = @_;
398 my ($port, $call) = split /\s+/, $line;
399 $conn->{agwpid} = ord "\xF0";
400 $conn->{agwport} = $port - 1;
401 $conn->{lineend} = "\cM";
402 $conn->{incoming} = 0;
403 $conn->{csort} = 'ax25';
404 $conn->{agwcall} = uc $call;
405 $circuit{$conn->{agwcall}} = $conn;
407 _sendf('C', $main::mycall, $conn->{agwcall}, $conn->{agwport}, $conn->{agwpid});
408 $conn->{state} = 'WC';
416 delete $circuit{$conn->{agwcall}};
417 $conn->SUPER::disconnect;
423 delete $circuit{$conn->{agwcall}};
424 if ($conn->{incoming}) {
425 _sendf('d', $conn->{agwcall}, $main::mycall, $conn->{agwport}, $conn->{agwpid});
427 _sendf('d', $main::mycall, $conn->{agwcall}, $conn->{agwport}, $conn->{agwpid});
429 $conn->SUPER::disconnect;
434 my ($conn, $msg) = @_;
436 $msg =~ s/^[-\w]+\|//;
437 # _sendf('Y', $main::mycall, $conn->{call}, $conn->{agwport}, $conn->{agwpid});
438 _sendf('D', $main::mycall, $conn->{agwcall}, $conn->{agwport}, $conn->{agwpid}, $msg . $conn->{lineend});
439 my $len = length($msg) + 1;
440 dbg("AGW Data Out port: $conn->{agwport} pid: $conn->{agwpid} '$main::mycall'->'$conn->{agwcall}' length: $len \"$msg\"") if isdbg('agw');
447 if ($ypolltime && $main::systime - $lastytime >= $ypolltime) {
448 for (my $i = 0; $i < $noports; $i++) {
449 _sendf('y', undef, undef, $i );
451 $lastytime = $main::systime;
453 if ($hpolltime && $main::systime - $lasthtime >= $hpolltime) {
454 for (my $i = 0; $i < $noports; $i++) {
455 _sendf('H', undef, undef, $i );
457 $lasthtime = $main::systime;