From edf02a551526d4d70dc70c300421c754f84d46e8 Mon Sep 17 00:00:00 2001
From: minima <minima>
Date: Wed, 2 May 2001 13:01:23 +0000
Subject: [PATCH] add an error counter to stop runaway spot suckers

---
 Changes               |  3 +++
 perl/DXChannel.pm     |  1 +
 perl/DXCommandmode.pm | 22 +++++++++++++++++++---
 3 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/Changes b/Changes
index a32d1bed..77493fda 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,6 @@
+02May01=======================================================================
+1. put an upper limit on the number of concurrent errors allowed in command
+mode (20). This should disconnect runaway spot suckers....
 28Apr01=======================================================================
 1. fix an occasional problem with 'sorry connected to' messages
 23Apr01=======================================================================
diff --git a/perl/DXChannel.pm b/perl/DXChannel.pm
index 6afd97e9..7602283f 100644
--- a/perl/DXChannel.pm
+++ b/perl/DXChannel.pm
@@ -91,6 +91,7 @@ $count = 0;
 		  talklist => '0,Talk List,parray',
 		  cluster => '5,Cluster data',
 		  isbasic => '9,Internal Connection', 
+		  errors => '9,Errors',
 		 );
 
 # object destruction
diff --git a/perl/DXCommandmode.pm b/perl/DXCommandmode.pm
index 6e7a0944..967cc022 100644
--- a/perl/DXCommandmode.pm
+++ b/perl/DXCommandmode.pm
@@ -32,13 +32,14 @@ use Sun;
 use Internet;
 
 use strict;
-use vars qw(%Cache %cmd_cache $errstr %aliases $scriptbase);
+use vars qw(%Cache %cmd_cache $errstr %aliases $scriptbase $maxerrors);
 
 %Cache = ();					# cache of dynamically loaded routine's mod times
 %cmd_cache = ();				# cache of short names
 $errstr = ();					# error string from eval
 %aliases = ();					# aliases for (parts of) commands
 $scriptbase = "$main::root/scripts"; # the place where all users start scripts go
+$maxerrors = 20;				# the maximum number of concurrent errors allowed before disconnection
 
 #
 # obtain a new connection this is derived from dxchannel
@@ -351,12 +352,27 @@ sub run_cmd
 				}
 			} else {
 				dbg('command', "cmd: $cmd not found");
-				return ($self->msg('e1'));
+				if (++$self->{errors} > $maxerrors) {
+					$self->send($self->msg('e26'));
+					$self->disconnect;
+					return ();
+				} else {
+					return ($self->msg('e1'));
+				}
 			}
 		}
 	}
 	
-	shift @ans;
+	my $ok = shift @ans;
+	if ($ok) {
+		delete $self->{errors};
+	} else {
+		if (++$self->{errors} > $maxerrors) {
+			$self->send($self->msg('e26'));
+			$self->disconnect;
+			return ();
+		}
+	}
 	return (@ans);
 }
 
-- 
2.43.0