-#!/usr/bin/perl
+#!/usr/bin/perl -w
#
# A thing that implements dxcluster 'protocol'
#
# This is a perl module/program that sits on the end of a dxcluster
# 'protocol' connection and deals with anything that might come along.
#
-# this program is called by ax25d and gets raw ax25 text on its input
+# this program is called by ax25d or inetd and gets raw ax25 text on its input
+# It can also be launched into the ether by the cluster program itself for outgoing
+# connections
+#
+# Calling syntax is:-
+#
+# client.pl [callsign] [telnet|ax25|local] [[connect] [program name and args ...]]
+#
+# if the callsign isn't given then the sysop callsign in DXVars.pm is assumed
+#
+# if there is no connection type then 'local' is assumed
+#
+# if there is a 'connect' keyword then it will try to launch the following program
+# and any arguments and connect the stdin & stdout of both the program and the
+# client together.
#
# Copyright (c) 1998 Dirk Koopman G1TLH
#
# $Id$
#
+require 5.004;
+
+# search local then perl directories
BEGIN {
- unshift @INC, "/spider/local";
- unshift @INC, "/spider/perl";
+ # root of directory tree for this system
+ $root = "/spider";
+ $root = $ENV{'DXSPIDER_ROOT'} if $ENV{'DXSPIDER_ROOT'};
+
+ unshift @INC, "$root/perl"; # this IS the right way round!
+ unshift @INC, "$root/local";
}
use Msg;
use DXVars;
-
-$mode = 1; # 1 - \n = \r as EOL, 2 - \n = \n, 0 - transparent
-$call = ""; # the callsign being used
-@stdoutq = (); # the queue of stuff to send out to the user
-$conn = 0; # the connection object for the cluster
-$lastbit = ""; # the last bit of an incomplete input line
-$nl = "\r";
+use DXDebug;
+use DXUtil;
+use Net::Telnet qw(TELOPT_ECHO TELOPT_BINARY);
+use IO::File;
+use IO::Socket;
+use IPC::Open2;
# cease communications
sub cease
{
- my $sendz = shift;
- if (defined $conn && $sendz) {
- $conn->send_now("Z$call|bye...\n");
- }
- exit(0);
+ my $sendz = shift;
+# if ($conn && $sendz) {
+# $conn->send_now("Z$call|bye...");
+# sleep(1);
+# }
+ $stdout->flush if $stdout;
+ if ($pid) {
+ dbg('connect', "killing $pid");
+ kill(9, $pid);
+ }
+ dbgclose();
+# $SIG{__WARN__} = sub {my $a = shift; cluck($a); };
+ sleep(1);
+
+ # do we need this ?
+ $conn->disconnect if $conn;
+ exit(0);
}
# terminate program from signal
sub sig_term
{
- cease(1);
+ cease(1);
+}
+
+# terminate a child
+sub sig_chld
+{
+ $SIG{CHLD} = \&sig_chld;
+ $waitedpid = wait;
+ dbg('connect', "caught $pid");
+}
+
+
+sub setmode
+{
+ if ($mode == 1) {
+ $mynl = "\r";
+ } else {
+ $mynl = "\n";
+ }
+ $/ = $mynl;
}
# handle incoming messages
sub rec_socket
{
- my ($con, $msg, $err) = @_;
- if (defined $err && $err) {
- cease(1);
- }
- if (defined $msg) {
- my ($sort, $call, $line) = $msg =~ /^(\w)(\S+)|(.*)$/;
-
- if ($sort eq 'D') {
- $nl = "" if $mode == 0;
- $line =~ s/\n/\r/o if $mode == 1;
- print $line, $nl;
- } elsif ($sort eq 'M') {
- $mode = $line; # set new mode from cluster
- } elsif ($sort eq 'Z') { # end, disconnect, go, away .....
- cease(0);
- }
- }
+ my ($con, $msg, $err) = @_;
+ if (defined $err && $err) {
+ cease(0);
+ }
+ if (defined $msg) {
+ my ($sort, $call, $line) = $msg =~ /^(\w)([^\|]+)\|(.*)$/;
+
+ if ($sort eq 'D') {
+ my $snl = $mynl;
+ my $newsavenl = "";
+ $snl = "" if $mode == 0;
+ $snl = "\r\n" if $mode == 3;
+ $snl = "\n" if $mode == 2;
+ if ($mode == 2 && $line =~ />$/) {
+ $newsavenl = $snl;
+ $snl = ' ';
+ }
+ $line =~ s/\n/\r/og if $mode == 1;
+ #my $p = qq($line$snl);
+ if ($buffered) {
+ if (length $outqueue >= $client_buffer_lth) {
+ print $stdout $outqueue;
+ pop @echo if @echo > $maxecho;
+ push @echo, $outqueue;
+ $outqueue = "";
+ }
+ $outqueue .= "$savenl$line$snl";
+ $lasttime = time;
+ } else {
+ print $stdout $savenl, $line, $snl;;
+ }
+ $savenl = $newsavenl;
+ } elsif ($sort eq 'M') {
+ $mode = $line; # set new mode from cluster
+ setmode();
+ } elsif ($sort eq 'E') {
+ if ($sort eq 'telnet') {
+ $mode = $line; # set echo mode from cluster
+ my $term = POSIX::Termios->new;
+ $term->getattr(fileno($sock));
+ $term->setiflag( 0 );
+ $term->setoflag( 0 );
+ $term->setattr(fileno($sock), &POSIX::TCSANOW );
+ }
+ } elsif ($sort eq 'I') {
+ ; # ignore echoed I frames
+ } elsif ($sort eq 'B') {
+ if ($buffered && $outqueue) {
+ print $stdout $outqueue;
+ pop @echo if @echo > $maxecho;
+ push @echo, $outqueue;
+ $outqueue = "";
+ }
+ $buffered = $line; # set buffered or unbuffered
+ } elsif ($sort eq 'Z') { # end, disconnect, go, away .....
+ cease(0);
+ }
+
+ # ******************************************************
+ # ******************************************************
+ # any other sorts that might happen are silently ignored.
+ # ******************************************************
+ # ******************************************************
+ } else {
+ cease(0);
+ }
+ $lasttime = time;
}
sub rec_stdin
{
- my ($fh) = @_;
- my $buf;
- my @lines;
- my $r;
- my $first;
- my $dangle = 0;
-
- $r = sysread($fh, $buf, 1024);
-# print "sys: $r $buf";
- if ($r > 0) {
- if ($mode) {
- $buf =~ s/\r/\n/o if $mode == 1;
- $dangle = !($buf =~ /\n$/);
- @lines = split /\n/, $buf;
- if ($dangle) { # pull off any dangly bits
- $buf = pop @lines;
- } else {
- $buf = "";
- }
- $first = shift @lines;
- unshift @lines, ($lastbit . $first) if ($first);
- foreach $first (@lines) {
- $conn->send_now("D$call|$first");
- }
- $lastbit = $buf;
+ my ($fh) = @_;
+ my $buf;
+ my @lines;
+ my $r;
+ my $first;
+ my $dangle = 0;
+
+ $r = sysread($fh, $buf, 1024);
+ # my $prbuf;
+ # $prbuf = $buf;
+ # $prbuf =~ s/\r/\\r/;
+ # $prbuf =~ s/\n/\\n/;
+ # print "sys: $r ($prbuf)\n";
+ if (!defined $r || $r == 0) {
+ cease(1);
+ } elsif ($r > 0) {
+ if ($mode) {
+ $buf =~ s/\r/\n/g if $mode == 1;
+ $buf =~ s/[\r\x00]//g if $mode == 2 || $mode == 3;
+
+ $dangle = !($buf =~ /\n$/);
+ if ($buf eq "\n") {
+ @lines = (" ");
+ } else {
+ @lines = split /\n/, $buf;
+ }
+ if ($dangle) { # pull off any dangly bits
+ $buf = pop @lines;
+ } else {
+ $buf = "";
+ }
+ $first = shift @lines;
+ unshift @lines, ($lastbit . $first) if ($first);
+ foreach $first (@lines) {
+ # print "send_now $call $first\n";
+ next if grep {$_ eq $first } @echo;
+ $conn->send_later("I$call|$first");
+ }
+ $lastbit = $buf;
+ $savenl = ""; # reset savenl 'cos we will have done a newline on input
+ } else {
+ $conn->send_later("I$call|$buf");
+ }
+ }
+ $lasttime = time;
+}
+
+sub optioncb
+{
+}
+
+sub doconnect
+{
+ my ($sort, $line) = @_;
+ dbg('connect', "CONNECT sort: $sort command: $line");
+ if ($sort eq 'telnet') {
+ # this is a straight network connect
+ my ($host, $port) = split /\s+/, $line;
+ $port = 23 if !$port;
+
+ $sock = new Net::Telnet (Timeout => $timeout, Port => $port);
+ $sock->option_callback(\&optioncb);
+ $sock->output_record_separator('');
+ $sock->option_accept(Dont => TELOPT_ECHO, Wont => TELOPT_ECHO);
+ $sock->open($host) or die "Can't connect to $host port $port $!";
+ $sock->binmode(1);
+ $mode = 3;
+ } elsif ($sort eq 'ax25' || $sort eq 'prog') {
+ my @args = split /\s+/, $line;
+ $rfh = new IO::File;
+ $wfh = new IO::File;
+ $pid = open2($rfh, $wfh, "$line") or die "can't do $line $!";
+ die "no receive channel $!" unless $rfh;
+ die "no transmit channel $!" unless $wfh;
+ dbg('connect', "got pid $pid");
+ $wfh->autoflush(1);
+ $mode = 1;
} else {
- $conn->send_now("D$call|$buf");
+ die "invalid type of connection ($sort)";
+ }
+ $csort = $sort;
+}
+
+sub doabort
+{
+ my $string = shift;
+ dbg('connect', "abort $string");
+ $abort = $string;
+}
+
+sub dotimeout
+{
+ my $val = shift;
+ dbg('connect', "timeout set to $val");
+ $timeout = $val;
+}
+
+sub dochat
+{
+ my ($expect, $send) = @_;
+ dbg('connect', "CHAT \"$expect\" -> \"$send\"");
+ my $line;
+
+ alarm($timeout);
+
+ if ($expect) {
+ for (;;) {
+ if ($csort eq 'telnet') {
+ $line = $sock->get();
+ cease(11) unless $line; # the socket has gone away?
+ if (length $line == 0) {
+ dbg('connect', "received 0 length line, aborting...");
+ cease(11);
+ }
+ $line =~ s/\r//g;
+ chomp;
+ } elsif ($csort eq 'ax25' || $csort eq 'prog') {
+ local $/ = "\r";
+ $line = <$rfh>;
+ if (length $line == 0) {
+ dbg('connect', "received 0 length line, aborting...");
+ cease(11);
+ }
+ $line =~ s/\r/\n/g;
+ chomp;
+ }
+ dbg('connect', map { "received \"$_\"" } split /\n/, $line);
+ if ($abort && $line =~ /$abort/i) {
+ dbg('connect', "aborted on /$abort/");
+ cease(11);
+ }
+ last if $line =~ /$expect/i;
+ }
+ }
+ if ($send) {
+ if ($csort eq 'telnet') {
+ $sock->print("$send\n");
+ } elsif ($csort eq 'ax25') {
+ local $\ = "\r";
+ $wfh->print("$send");
+ }
+ dbg('connect', "sent \"$send\"");
}
- } elsif ($r == 0) {
- cease(1);
- }
}
-$call = uc $ARGV[0];
-die "client.pl <call> [<mode>]\r\n" if (!$call);
-$mode = $ARGV[1] if (@ARGV > 1);
+sub timeout
+{
+ dbg('connect', "timed out after $timeout seconds");
+ cease(0);
+}
+
+# handle callsign and connection type firtling
+sub doclient
+{
+ my $line = shift;
+ my @f = split /\s+/, $line;
+ $call = uc $f[0] if $f[0];
+ $csort = $f[1] if $f[1];
+}
+
+#
+# initialisation
+#
+
+$mode = 2; # 1 - \n = \r as EOL, 2 - \n = \n, 0 - transparent
+$call = ""; # the callsign being used
+$conn = 0; # the connection object for the cluster
+$lastbit = ""; # the last bit of an incomplete input line
+$mynl = "\n"; # standard terminator
+$lasttime = time; # lasttime something happened on the interface
+$outqueue = ""; # the output queue
+$client_buffer_lth = 200; # how many characters are buffered up on outqueue
+$buffered = 1; # buffer output
+$savenl = ""; # an NL that has been saved from last time
+$timeout = 60; # default timeout for connects
+$abort = ""; # the current abort string
+$cpath = "$root/connect"; # the basic connect directory
+$maxecho = 5; # length of max echo queue
+
+$pid = 0; # the pid of the child program
+$csort = ""; # the connection type
+$sock = 0; # connection socket
-if ($mode != 1) {
- $nl = "\n";
- $\ = $nl;
+$stdin = *STDIN;
+$stdout = *STDOUT;
+$rfh = 0;
+$wfh = 0;
+
+$waitedpid = 0;
+
+#
+# deal with args
+#
+
+$call = uc shift @ARGV if @ARGV;
+$call = uc $myalias if !$call;
+$connsort = lc shift @ARGV if @ARGV;
+$connsort = 'local' if !$connsort;
+
+$loginreq = $call eq 'LOGIN';
+
+# we will do this again later 'cos things may have changed
+$mode = ($connsort eq 'ax25') ? 1 : 2;
+setmode();
+
+if ($call eq $mycall) {
+ print $stdout "You cannot connect as your cluster callsign ($mycall)", $nl;
+ cease(0);
}
-select STDOUT; $| = 1;
+$stdout->autoflush(1);
$SIG{'INT'} = \&sig_term;
$SIG{'TERM'} = \&sig_term;
-#$SIG{'HUP'} = \&sig_term;
+$SIG{'HUP'} = \&sig_term;
+$SIG{'CHLD'} = \&sig_chld;
+$SIG{'ALRM'} = \&timeout;
+
+dbgadd('connect');
+
+# do we need to do a login and password job?
+if ($loginreq) {
+ my $user;
+ my $s;
+
+ $connsort = 'telnet' if $connsort eq 'local';
+ setmode();
+
+ if (-e "$data/issue") {
+ open(I, "$data/issue") or die;
+ local $/ = undef;
+ $issue = <I>;
+ close(I);
+ $issue = s/\n/\r/og if $mode == 1;
+ local $/ = $nl;
+ $stdout->print($issue) if $issue;
+ }
+
+ # allow a login from an existing user. I could create a user but
+ # I want to check for valid callsigns and I don't have the
+ # necessary info / regular expression yet
+ alarm($timeout);
+
+ $stdout->print('login: ');
+ $stdout->flush();
+ local $\ = $mynl;
+ $s = $stdin->getline();
+ chomp $s;
+ $s =~ s/\s+//og;
+ $s =~ s/-\d+$//o; # no ssids!
+ cease(0) unless $s && $s gt ' ';
+ unless (iscallsign($s)) {
+ $stdout->print("Sorry, $s is an invalid callsign");
+ cease(0);
+ }
+ $call = uc $s;
+ alarm(0);
+}
+
+# is this an out going connection?
+if ($connsort eq "connect") {
+ my $mcall = lc $call;
+
+ open(IN, "$cpath/$mcall") or cease(2);
+ @in = <IN>;
+ close IN;
+
+ alarm($timeout);
+
+ for (@in) {
+ chomp;
+ next if /^\s*\#/o;
+ next if /^\s*$/o;
+ doconnect($1, $2) if /^\s*co\w*\s+(\w+)\s+(.*)$/io;
+ doabort($1) if /^\s*a\w*\s+(.*)/io;
+ dotimeout($1) if /^\s*t\w*\s+(\d+)/io;
+ dochat($1, $2) if /^\s*\'(.*)\'\s+\'(.*)\'/io;
+ if (/^\s*cl\w+\s+(.*)/io) {
+ doclient($1);
+ last;
+ }
+ }
+
+ dbg('connect', "Connected to $call ($csort), starting normal protocol");
+ dbgsub('connect');
+
+ # if we get here we are connected
+ if ($csort eq 'ax25' || $csort eq 'prog') {
+ # open(STDIN, "<&R");
+ # open(STDOUT, ">&W");
+ # close R;
+ # close W;
+ $stdin = $rfh;
+ $stdout = $wfh;
+ $csort = 'telnet' if $csort eq 'prog';
+ } elsif ($csort eq 'telnet') {
+ # open(STDIN, "<&$sock");
+ # open(STDOUT, ">&$sock");
+ # close $sock;
+ $stdin = $sock;
+ $stdout = $sock;
+ }
+ alarm(0);
+ $outbound = 1;
+ $connsort = $csort;
+ $stdout->autoflush(1);
+ $mode = ($connsort eq 'ax25') ? 1 : $mode;
+ close STDIN;
+ close STDOUT;
+ close STDERR;
+}
+
+setmode();
+
+# adjust the callsign if it has an SSID, SSID <= 8 are legal > 8 are netrom connections
+$call =~ s/-0$//; # strip off -0 as this is equiv to just call on its own
+my ($scall, $ssid) = split /-/, $call;
+$ssid = undef unless $ssid && $ssid =~ /^\d+$/;
+if ($ssid) {
+ $ssid = 15 if $ssid > 15;
+ if ($connsort eq 'ax25') {
+ if ($ssid > 8) {
+ $ssid = 15 - $ssid;
+ }
+ }
+ $call = "$scall-$ssid";
+}
+
$conn = Msg->connect("$clusteraddr", $clusterport, \&rec_socket);
-$conn->send_now("A$call|start");
-Msg->set_event_handler(\*STDIN, "read" => \&rec_stdin);
-Msg->event_loop();
+if (! $conn) {
+ if (-r "$data/offline") {
+ open IN, "$data/offline" or die;
+ while (<IN>) {
+ s/\n/\r/og if $mode == 1;
+ print $stdout $_;
+ }
+ close IN;
+ } else {
+ print $stdout "Sorry, the cluster $mycall is currently off-line", $mynl;
+ }
+ cease(0);
+}
+
+$let = $outbound ? 'O' : 'A';
+$conn->send_now("$let$call|$connsort");
+Msg->set_event_handler($stdin, "read" => \&rec_stdin);
+
+for (;;) {
+ my $t;
+ Msg->event_loop(1, 1);
+ $t = time;
+ if ($t > $lasttime) {
+ if ($outqueue) {
+ print $stdout $outqueue;
+ $outqueue = "";
+ }
+ $lasttime = $t;
+ }
+}
+exit(0);