From 72e9dcbade3fdb51d9291a2856ca1cc998241f9b Mon Sep 17 00:00:00 2001
From: djk <djk>
Date: Sun, 18 Jun 2000 00:31:17 +0000
Subject: [PATCH] Hardened up the cluster->client link in the cluster software
 so that rubbish on port 27754 doesn't (usually) crash the cluster.

---
 Changes           |  2 ++
 perl/DXChannel.pm | 20 ++++++++++++++++++++
 perl/cluster.pl   | 11 +++++------
 3 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/Changes b/Changes
index 32d3844b..a71063c4 100644
--- a/Changes
+++ b/Changes
@@ -4,6 +4,8 @@
 3. added update_sysop.pl which cleans out all previous versions of the sysops
 information from the user database and recreates it with that in DXVars.pm
 4. Added node type to links and who
+5. Hardened up the cluster->client link in the cluster software so that 
+rubbish on port 27754 doesn't (usually) crash the cluster.
 14Jun00=======================================================================
 1. fixed sh/node crash
 2. fixed RTT in who.pl
diff --git a/perl/DXChannel.pm b/perl/DXChannel.pm
index 3637b762..df74bfc8 100644
--- a/perl/DXChannel.pm
+++ b/perl/DXChannel.pm
@@ -436,6 +436,26 @@ sub field_prompt
 	return $valid{$ele};
 }
 
+# take a standard input message and decode it into its standard parts
+sub decode_input
+{
+	my $dxchan = shift;
+	my $data = shift;
+	my ($sort, $call, $line) = $data =~ /^([A-Z])([A-Z1-9\-]{3,9})\|(.*)$/;
+
+	my $chcall = (ref $dxchan) ? $dxchan->call : "UN.KNOWN";
+	
+	# the above regexp must work
+	if (!defined $sort || !defined $call || !defined  $line ||
+		   (ref $dxchan && $call ne $chcall)) {
+		$data =~ s/([\x00-\x1f\x7f-\xff])/uc sprintf("%%%02x",ord($1))/eg;
+		dbg('chan', "DUFF Line from $chcall: $data");
+		return ();
+	}
+	
+	return ($sort, $call, $line);
+}
+
 no strict;
 sub AUTOLOAD
 {
diff --git a/perl/cluster.pl b/perl/cluster.pl
index d026edd6..4da018b0 100755
--- a/perl/cluster.pl
+++ b/perl/cluster.pl
@@ -120,7 +120,8 @@ sub rec
 	
 	# set up the basic channel info - this needs a bit more thought - there is duplication here
 	if (!defined $dxchan) {
-		my ($sort, $call, $line) = $msg =~ /^(\w)(\S+)\|(.*)$/;
+		my ($sort, $call, $line) = DXChannel::decode_input(0, $msg);
+		return unless defined $sort;
  
 		# is there one already connected to me - locally? 
 		my $user = DXUser->get($call);
@@ -246,17 +247,15 @@ sub process_inqueue
 	
 	my $data = $self->{data};
 	my $dxchan = $self->{dxchan};
-	my ($sort, $call, $line) = $data =~ /^(\w)([^\|]+)\|(.*)$/;
 	my $error;
-	
-	# the above regexp must work
-	return unless ($sort && $call && $line);
+	my ($sort, $call, $line) = DXChannel::decode_input($dxchan, $data);
+	return unless defined $sort;
 	
 	# translate any crappy characters into hex characters 
 	if ($line =~ /[\x00-\x06\x08\x0a-\x1f\x7f-\xff]/o) {
 		$line =~ s/([\x00-\x1f\x7f-\xff])/uc sprintf("%%%02x",ord($1))/eg;
 	}
-	
+
 	# do the really sexy console interface bit! (Who is going to do the TK interface then?)
 	dbg('chan', "<- $sort $call $line\n") unless $sort eq 'D';
 
-- 
2.34.1