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489 lines
9.9 KiB
Perl
489 lines
9.9 KiB
Perl
#
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# This has been taken from the 'Advanced Perl Programming' book by Sriram Srinivasan
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#
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# I am presuming that the code is distributed on the same basis as perl itself.
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#
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# I have modified it to suit my devious purposes (Dirk Koopman G1TLH)
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#
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#
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#
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package Msg;
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use strict;
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use DXUtil;
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use AnyEvent;
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use AnyEvent::Handle;
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use AnyEvent::Socket;
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use DXDebug;
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use Timer;
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use vars qw(%conns $noconns $cnum $total_in $total_out);
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$total_in = $total_out = 0;
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$cnum = 0;
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#
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#-----------------------------------------------------------------
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# Generalised initializer
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sub new
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{
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my ($pkg, $rproc) = @_;
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my $obj = ref($pkg);
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my $class = $obj || $pkg;
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my $conn = {
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rproc => $rproc,
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inqueue => [],
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outqueue => [],
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state => 0,
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lineend => "\r\n",
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csort => 'telnet',
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timeval => 60,
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blocking => 0,
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cnum => (($cnum < 999) ? (++$cnum) : ($cnum = 1)),
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};
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$noconns++;
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dbg("Connection created ($noconns)") if isdbg('connll');
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return bless $conn, $class;
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}
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sub set_error
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{
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my $conn = shift;
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my $callback = shift;
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$conn->{eproc} = $callback;
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}
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sub set_eof
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{
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my $conn = shift;
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my $callback = shift;
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$conn->{sock}->on_eof(sub {$callback});
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}
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sub set_rproc
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{
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my $conn = shift;
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my $callback = shift;
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$conn->{rproc} = $callback;
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}
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# save it
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sub conns
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{
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my $pkg = shift;
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my $call = shift;
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my $ref;
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if (ref $pkg) {
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$call = $pkg->{call} unless $call;
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return undef unless $call;
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dbg("changing $pkg->{call} to $call") if isdbg('connll') && exists $pkg->{call} && $call ne $pkg->{call};
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delete $conns{$pkg->{call}} if exists $pkg->{call} && exists $conns{$pkg->{call}} && $pkg->{call} ne $call;
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$pkg->{call} = $call;
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$ref = $conns{$call} = $pkg;
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dbg("Connection $pkg->{cnum} $call stored") if isdbg('connll');
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} else {
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$ref = $conns{$call};
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}
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return $ref;
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}
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# this is only called by any dependent processes going away unexpectedly
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sub pid_gone
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{
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my ($pkg, $pid) = @_;
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my @pid = grep {$_->{pid} == $pid} values %conns;
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foreach my $p (@pid) {
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&{$p->{eproc}}($p, "$pid has gorn") if exists $p->{eproc};
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$p->disconnect;
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}
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}
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sub ax25
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{
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my $conn = shift;
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return $conn->{csort} eq 'ax25';
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}
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sub peerhost
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{
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my $conn = shift;
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$conn->{peerhost} ||= 'ax25' if $conn->ax25;
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$conn->{peerhost} ||= $conn->{sock}->peerhost if $conn->{sock} && $conn->{sock}->isa('IO::Socket::INET');
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$conn->{peerhost} ||= 'UNKNOWN';
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return $conn->{peerhost};
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}
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#-----------------------------------------------------------------
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# Send side routines
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sub connect {
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my ($pkg, $to_host, $to_port, $rproc) = @_;
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# Create a connection end-point object
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my $conn = $pkg;
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unless (ref $pkg) {
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$conn = $pkg->new($rproc);
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}
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$conn->{peerhost} = $to_host;
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$conn->{peerport} = $to_port;
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$conn->{sort} = 'Outgoing';
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my $sock = AnyEvent::Handle->new(
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connect => [$to_host, $to_port],
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on_connect => sub {my $h = shift; $conn->{peerhost} = shift;},
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on_eof => sub {$conn->disconnect},
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on_error => sub {$conn->disconnect},
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keepalive => 1,
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linger => 0,
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);
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$conn->{sock} = $sock;
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$sock->on_read(sub{$conn->_rcv});
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return $conn;
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}
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sub start_program
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{
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my ($conn, $line, $sort) = @_;
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my $pid;
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# local $^F = 10000; # make sure it ain't closed on exec
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# my ($a, $b) = $io_socket->socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC);
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# if ($a && $b) {
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# $a->autoflush(1);
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# $b->autoflush(1);
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# $pid = fork;
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# if (defined $pid) {
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# if ($pid) {
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# close $b;
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# $conn->{sock} = $a;
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# $conn->{csort} = $sort;
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# $conn->{lineend} = "\cM" if $sort eq 'ax25';
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# $conn->{pid} = $pid;
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# if ($conn->{rproc}) {
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# my $callback = sub {$conn->_rcv};
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# Msg::set_event_handler ($a, read => $callback);
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# }
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# dbg("connect $conn->{cnum}: started pid: $conn->{pid} as $line") if isdbg('connect');
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# } else {
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# $^W = 0;
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# dbgclose();
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# STDIN->close;
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# STDOUT->close;
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# STDOUT->close;
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# *STDIN = IO::File->new_from_fd($b, 'r') or die;
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# *STDOUT = IO::File->new_from_fd($b, 'w') or die;
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# *STDERR = IO::File->new_from_fd($b, 'w') or die;
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# close $a;
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# unless ($main::is_win) {
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# # $SIG{HUP} = 'IGNORE';
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# $SIG{HUP} = $SIG{CHLD} = $SIG{TERM} = $SIG{INT} = 'DEFAULT';
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# alarm(0);
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# }
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# exec "$line" or dbg("exec '$line' failed $!");
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# }
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# } else {
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# dbg("cannot fork for $line");
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# }
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# } else {
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# dbg("no socket pair $! for $line");
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# }
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return $pid;
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}
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sub disconnect
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{
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my $conn = shift;
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return if exists $conn->{disconnecting};
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$conn->{disconnecting} = 1;
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my $sock = delete $conn->{sock};
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$conn->{state} = 'E';
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$conn->{timeout}->del if $conn->{timeout};
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# be careful to delete the correct one
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my $call;
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if ($call = $conn->{call}) {
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my $ref = $conns{$call};
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delete $conns{$call} if $ref && $ref == $conn;
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}
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$call ||= 'unallocated';
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dbg("Connection $conn->{cnum} $call disconnected") if isdbg('connll');
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# get rid of any references
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for (keys %$conn) {
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if (ref($conn->{$_})) {
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delete $conn->{$_};
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}
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}
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if (defined($sock)) {
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shutdown($sock->{fh}, 2);
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$sock->destroy;
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}
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unless ($main::is_win) {
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kill 'TERM', $conn->{pid} if exists $conn->{pid};
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}
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}
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sub _send_stuff
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{
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my $conn = shift;
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my $rq = $conn->{outqueue};
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my $sock = $conn->{sock};
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while (@$rq) {
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my $data = shift @$rq;
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my $lth = length $data;
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my $call = $conn->{call} || 'none';
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if (isdbg('raw')) {
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if (isdbg('raw')) {
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dbgdump('raw', "$call send $lth: ", $lth);
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}
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}
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if (defined $sock && !$sock->destroyed) {
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$sock->push_write($data);
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$total_out = $lth;
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} else {
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dbg("_send_stuff $call ending data ignored: $data");
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}
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}
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}
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sub send_later {
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my ($conn, $msg) = @_;
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my $rq = $conn->{outqueue};
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my $sock = $conn->{sock};
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# this is done like this because enqueueing may be going on independently of
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# sending (whether later or now)
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$conn->enqueue($msg);
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_send_stuff($conn)
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}
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sub send_now { goto &send_later; }
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sub send_raw
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{
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my ($conn, $msg) = @_;
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push @{$conn->{outqueue}}, $msg;
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_send_stuff($conn);
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}
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sub enqueue {
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my $conn = shift;
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push (@{$conn->{outqueue}}, defined $_[0] ? $_[0] : '');
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}
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sub _err_will_block {
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return 0;
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}
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sub close_on_empty
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{
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my $conn = shift;
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$conn->{sock}->on_drain(sub {$conn->disconnect;});
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}
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#-----------------------------------------------------------------
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# Receive side routines
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sub new_server {
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@_ == 4 || die "Msg->new_server (myhost, myport, login_proc\n";
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my ($pkg, $my_host, $my_port, $login_proc) = @_;
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my $self = $pkg->new($login_proc);
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$self->{sock} = tcp_server $my_host, $my_port, sub { $self->new_client(@_); }, sub { return 256; };
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die "Could not create socket: $! \n" unless $self->{sock};
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return $self;
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}
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sub nolinger
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{
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my $conn = shift;
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my $sock = $conn->{sock};
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# $sock->linger(0);
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# $sock->keepalive(1);
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}
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sub dequeue
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{
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my $conn = shift;
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if ($conn->{msg} =~ /\n/) {
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my @lines = split /\r?\n/, $conn->{msg};
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if ($conn->{msg} =~ /\n$/) {
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delete $conn->{msg};
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} else {
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$conn->{msg} = pop @lines;
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}
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for (@lines) {
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&{$conn->{rproc}}($conn, defined $_ ? $_ : '');
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}
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}
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}
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sub _rcv { # Complement to _send
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my $conn = shift; # $rcv_now complement of $flush
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# Find out how much has already been received, if at all
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my ($msg, $offset, $bytes_to_read, $bytes_read);
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my $sock = $conn->{sock};
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return unless defined($sock);
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my @lines;
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$msg = $sock->{rbuf};
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$bytes_read = length $msg || 0;
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$sock->{rbuf} = '';
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if ($bytes_read > 0) {
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$total_in += $bytes_read;
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if (isdbg('raw')) {
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my $call = $conn->{call} || 'none';
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dbgdump('raw', "$call read $bytes_read: ", $msg);
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}
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if ($conn->{echo}) {
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my @ch = split //, $msg;
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my $out;
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for (@ch) {
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if (/[\cH\x7f]/) {
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$out .= "\cH \cH";
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$conn->{msg} =~ s/.$//;
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} else {
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$out .= $_;
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$conn->{msg} .= $_;
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}
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}
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if (defined $out) {
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$conn->send_now($out);
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}
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} else {
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$conn->{msg} .= $msg;
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}
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}
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unless ($conn->{disable_read}) {
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$conn->dequeue if exists $conn->{msg};
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}
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}
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sub new_client {
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my $server_conn = shift;
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my $sock = shift;
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my $peerhost = shift;
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my $peerport = shift;
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if ($sock) {
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my $conn = $server_conn->new($server_conn->{rproc});
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$conn->{sock} = AnyEvent::Handle->new(
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fh => $sock,
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on_eof => sub {$conn->disconnect},
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on_error => sub {$conn->disconnect},
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keepalive => 1,
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linger => 0,
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);
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$conn->{blocking} = 0;
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my ($rproc, $eproc) = &{$server_conn->{rproc}} ($conn, $conn->{peerhost} = $peerhost, $conn->{peerport} = $peerport);
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dbg("accept $conn->{cnum} from $conn->{peerhost} $conn->{peerport}") if isdbg('connll');
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$conn->{sort} = 'Incoming';
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if ($eproc) {
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$conn->{eproc} = $eproc;
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}
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if ($rproc) {
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$conn->{rproc} = $rproc;
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$conn->{sock}->on_read(sub {$conn->_rcv});
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} else { # Login failed
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&{$conn->{eproc}}($conn, undef) if exists $conn->{eproc};
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$conn->disconnect();
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}
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} else {
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dbg("Msg: error on accept ($!)") if isdbg('err');
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}
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}
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sub close_server
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{
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my $conn = shift;
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undef $conn->{sock};
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}
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# close all clients (this is for forking really)
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sub close_all_clients
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{
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foreach my $conn (values %conns) {
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$conn->disconnect;
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}
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}
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sub disable_read
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{
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my $conn = shift;
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return defined $_[0] ? $conn->{disable_read} = $_[0] : $_[0];
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}
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sub sleep
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{
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my ($pkg, $interval) = @_;
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my $cv = AnyEvent->condvar;
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my $wait_a_bit = AnyEvent->timer(
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after => $interval,
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cb => sub {$cv->send},
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);
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$cv->recv;
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}
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sub set_event_handler
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{
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my $sock = shift;
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my %args = @_;
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my ($pkg, $fn, $line) = caller;
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my $s;
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foreach (my ($k,$v) = each %args) {
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$s .= "$k => $v, ";
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}
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$s =~ s/[\s,]$//;
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dbg("Msg::set_event_handler called from ${pkg}::${fn} line $line doing $s");
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}
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sub echo
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{
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my $conn = shift;
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return defined $_[0] ? $conn->{echo} = $_[0] : $_[0];
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}
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sub DESTROY
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{
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my $conn = shift;
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my $call = $conn->{call} || 'unallocated';
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my $host = $conn->{peerhost} || '';
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my $port = $conn->{peerport} || '';
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dbg("Connection $conn->{cnum} $call [$host $port] being destroyed") if isdbg('connll');
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$noconns--;
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}
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1;
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__END__
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