--- loncom/loncron	2015/09/20 18:31:21	1.103
+++ loncom/loncron	2024/07/28 23:52:11	1.103.2.16
@@ -2,7 +2,7 @@
 
 # Housekeeping program, started by cron, loncontrol and loncron.pl
 #
-# $Id: loncron,v 1.103 2015/09/20 18:31:21 raeburn Exp $
+# $Id: loncron,v 1.103.2.16 2024/07/28 23:52:11 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -37,10 +37,18 @@ use LONCAPA;
 use Apache::lonnet;
 use Apache::loncommon;
 
+use LWP::UserAgent();
+use HTTP::Request();
 use IO::File;
 use IO::Socket;
 use HTML::Entities;
 use Getopt::Long;
+use GDBM_File qw(GDBM_READER);
+use Storable qw(thaw);
+use File::ReadBackwards;
+use File::Copy;
+use Sys::Hostname::FQDN();
+
 #globals
 use vars qw (%perlvar %simplestatus $errors $warnings $notices $totalcount);
 
@@ -73,14 +81,14 @@ sub rotate_logfile {
 	rename("$file.2","$file.3");
 	rename("$file.1","$file.2");
 	rename("$file","$file.1");
-    } 
+    }
 }
 
 sub start_daemon {
     my ($fh,$daemon,$pidfile,$args) = @_;
     my $progname=$daemon;
     if ($daemon eq 'lonc') {
-	$progname='loncnew'; 
+	$progname='loncnew';
     }
     my $error_fname="$perlvar{'lonDaemons'}/logs/${daemon}_errors";
     &rotate_logfile($error_fname,$fh,'error logs');
@@ -111,20 +119,23 @@ sub checkon_daemon {
     my $result;
     &log($fh,'<hr /><a name="'.$daemon.'" /><h2>'.$daemon.'</h2><h3>Log</h3><p style="white-space: pre;"><tt>');
     printf("%-15s ",$daemon);
-    if (-e "$perlvar{'lonDaemons'}/logs/$daemon.log"){
-	open (DFH,"tail -n25 $perlvar{'lonDaemons'}/logs/$daemon.log|");
-	while (my $line=<DFH>) { 
-	    &log($fh,"$line");
-	    if ($line=~/INFO/) { $notices++; }
-	    if ($line=~/WARNING/) { $notices++; }
-	    if ($line=~/CRITICAL/) { $warnings++; }
-	};
-	close (DFH);
+    if ($fh) {
+        if (-e "$perlvar{'lonDaemons'}/logs/$daemon.log"){
+	    if (open(DFH,"tail -n25 $perlvar{'lonDaemons'}/logs/$daemon.log|")) {
+	        while (my $line=<DFH>) {
+	            &log($fh,"$line");
+	            if ($line=~/INFO/) { $notices++; }
+	            if ($line=~/WARNING/) { $notices++; }
+	            if ($line=~/CRITICAL/) { $warnings++; }
+	        }
+	        close (DFH);
+            }
+        }
+        &log($fh,"</tt></p>");
     }
-    &log($fh,"</tt></p>");
-    
+
     my $pidfile="$perlvar{'lonDaemons'}/logs/$daemon.pid";
-    
+ 
     my $restartflag=1;
     my $daemonpid;
     if (-e $pidfile) {
@@ -164,7 +175,7 @@ sub checkon_daemon {
 	    `killall -9 $kadaemon 2>&1`.
 	    '</font><br />');
 	&log($fh,"<h3>$daemon not running, trying to start</h3>");
-	
+
 	if (&start_daemon($fh,$daemon,$pidfile,$args)) {
 	    &log($fh,"<h3>$daemon at pid $daemonpid responding</h3>");
 	    $simplestatus{$daemon}='restarted';
@@ -189,20 +200,22 @@ sub checkon_daemon {
 		&log($fh,"<p>Unable to start $daemon</p>");
 	    }
 	}
-
-	if (-e "$perlvar{'lonDaemons'}/logs/$daemon.log"){
-	    &log($fh,"<p><pre>");
-	    open (DFH,"tail -n100 $perlvar{'lonDaemons'}/logs/$daemon.log|");
-	    while (my $line=<DFH>) { 
-		&log($fh,"$line");
-		if ($line=~/WARNING/) { $notices++; }
-		if ($line=~/CRITICAL/) { $notices++; }
-	    };
-	    close (DFH);
-	    &log($fh,"</pre></p>");
-	}
+        if ($fh) {
+	    if (-e "$perlvar{'lonDaemons'}/logs/$daemon.log"){
+	        &log($fh,"<p><pre>");
+	        if (open(DFH,"tail -n100 $perlvar{'lonDaemons'}/logs/$daemon.log|")) {
+	            while (my $line=<DFH>) { 
+		        &log($fh,"$line");
+		        if ($line=~/WARNING/) { $notices++; }
+		        if ($line=~/CRITICAL/) { $notices++; }
+	            }
+	            close (DFH);
+                }
+	        &log($fh,"</pre></p>");
+	    }
+        }
     }
-    
+
     my $fname="$perlvar{'lonDaemons'}/logs/$daemon.log";
     &rotate_logfile($fname,$fh,'logs');
 
@@ -215,19 +228,34 @@ sub log_machine_info {
     my ($fh)=@_;
     &log($fh,'<hr /><a name="machine" /><h2>Machine Information</h2>');
     &log($fh,"<h3>loadavg</h3>");
-	
+
+    my $cpucount;
+    if (open(PIPE,"lscpu |grep '^CPU(s)' 2>&1 |")) {
+        my $info = <PIPE>;
+        chomp($info);
+        ($cpucount) = ($info =~ /^\QCPU(s):\E\s+(\d+)$/);
+        close(PIPE);
+    }
+    if (!$cpucount) {
+        $cpucount = 1;
+    }
+    my %loadtarget = (
+                        error => 4.0*$cpucount,
+                        warn  => 2.0*$cpucount,
+                        note  => 1.0*$cpucount,
+                     );
     open (LOADAVGH,"/proc/loadavg");
     my $loadavg=<LOADAVGH>;
     close (LOADAVGH);
-    
+
     &log($fh,"<tt>$loadavg</tt>");
-    
+
     my @parts=split(/\s+/,$loadavg);
-    if ($parts[1]>4.0) {
+    if ($parts[1]>$loadtarget{'error'}) {
 	$errors++;
-    } elsif ($parts[1]>2.0) {
+    } elsif ($parts[1]>$loadtarget{'warn'}) {
 	$warnings++;
-    } elsif ($parts[1]>1.0) {
+    } elsif ($parts[1]>$loadtarget{'note'}) {
 	$notices++;
     }
 
@@ -235,14 +263,14 @@ sub log_machine_info {
     &log($fh,"<pre>");
 
     open (DFH,"df|");
-    while (my $line=<DFH>) { 
-	&log($fh,&encode_entities($line,'<>&"')); 
+    while (my $line=<DFH>) {
+	&log($fh,&encode_entities($line,'<>&"'));
 	@parts=split(/\s+/,$line);
 	my $usage=$parts[4];
 	$usage=~s/\W//g;
-	if ($usage>90) { 
+	if ($usage>90) {
 	    $warnings++;
-	    $notices++; 
+	    $notices++;
 	} elsif ($usage>80) {
 	    $warnings++;
 	} elsif ($usage>60) {
@@ -259,8 +287,8 @@ sub log_machine_info {
     my $psproc=0;
 
     open (PSH,"ps aux --cols 140 |");
-    while (my $line=<PSH>) { 
-	&log($fh,&encode_entities($line,'<>&"')); 
+    while (my $line=<PSH>) {
+	&log($fh,&encode_entities($line,'<>&"'));
 	$psproc++;
     }
     close (PSH);
@@ -282,7 +310,7 @@ sub start_logging {
     my %simplestatus=();
     my $now=time;
     my $date=localtime($now);
-    
+
 
     &log($fh,(<<ENDHEADERS));
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
@@ -307,6 +335,7 @@ sub start_logging {
 <li><a href="#lonc">lonc</a></li>
 <li><a href="#lonnet">lonnet</a></li>
 <li><a href="#connections">Connections</a></li>
+<li><a href="#bashconf">bash readline config</a></li>
 <li><a href="#delayed">Delayed Messages</a></li>
 <li><a href="#errcount">Error Count</a></li>
 </ol>
@@ -398,12 +427,12 @@ sub recursive_clean_tmp {
                 ($cleaned,$old,$removed) = 
                      &recursive_clean_tmp($innerdir,$cleaned,$old,$removed,$errors);
                 my @doms = &Apache::lonnet::current_machine_domains();
-                
+
                 if (open(my $dirhandle,$fname)) {
                     unless (($innerdir eq 'helprequests') ||
                             (($innerdir =~ /^addcourse/) && ($innerdir !~ m{/\d+$}))) {
                         my @contents = grep {!/^\.\.?$/} readdir($dirhandle);
-                                      join('&&',@contents)."\n";    
+                                      join('&&',@contents)."\n";
                         if (scalar(grep {!/^\.\.?$/} readdir($dirhandle)) == 0) {
                             closedir($dirhandle);
                             if ($fname =~ m{^\Q$perlvar{'lonDaemons'}\E/tmp/}) {
@@ -456,7 +485,7 @@ sub recursive_clean_tmp {
                                 }
                             }
                         } elsif (ref($errors->{failopen}) eq 'ARRAY') {
-                            push(@{$errors->{failopen}},$fname); 
+                            push(@{$errors->{failopen}},$fname);
                         }
                     } else {
                         if (unlink($fname)) {
@@ -482,24 +511,71 @@ sub clean_lonIDs {
     my $cleaned=0;
     my $active=0;
     while (my $fname=<$perlvar{'lonIDsDir'}/*>) {
-	my ($dev,$ino,$mode,$nlink,
-	    $uid,$gid,$rdev,$size,
-	    $atime,$mtime,$ctime,
-	    $blksize,$blocks)=stat($fname);
-	my $now=time;
-	my $since=$now-$mtime;
-	if ($since>$perlvar{'lonExpire'}) {
-	    $cleaned++;
-	    &log($fh,"Unlinking $fname<br />");
-	    unlink("$fname");
-	} else {
-	    $active++;
-	}
+        my $now=time;
+        if (-l $fname) {
+            my $linkfname = readlink($fname);
+            if (-f $linkfname) {
+                if ($linkfname =~ m{^$perlvar{'lonIDsDir'}/[^/]+\.id$}) {
+                    my @data = stat($linkfname);
+                    my $mtime = $data[9];
+                    my $since=$now-$mtime;
+                    if ($since>$perlvar{'lonExpire'}) {
+                        if (unlink($linkfname)) {
+                            $cleaned++;
+                            &log($fh,"Unlinking $linkfname<br />");
+                            unlink($fname);
+                        }
+                    }
+                }
+            } else {
+               unlink($fname);
+            }
+        } elsif (-f $fname) {
+            my @data = stat($fname);
+            my $mtime = $data[9];
+            my $since=$now-$mtime;
+            if ($since>$perlvar{'lonExpire'}) {
+                if (unlink($fname)) {
+                    $cleaned++;
+                    &log($fh,"Unlinking $fname<br />");
+                }
+            } else {
+                $active++;
+            }
+        }
     }
     &log($fh,"<p>Cleaned up ".$cleaned." stale session token(s).</p>");
     &log($fh,"<h3>$active open session(s)</h3>");
 }
 
+# -------------------------------------------------------- clean out balanceIDs
+
+sub clean_balanceIDs {
+    my ($fh)=@_;
+    &log($fh,'<hr /><a name="balcookies" /><h2>Session Tokens</h2>');
+    my $cleaned=0;
+    my $active=0;
+    if (-d $perlvar{'lonBalanceDir'}) {
+        while (my $fname=<$perlvar{'lonBalanceDir'}/*.id>) {
+            my ($dev,$ino,$mode,$nlink,
+                $uid,$gid,$rdev,$size,
+                $atime,$mtime,$ctime,
+                $blksize,$blocks)=stat($fname);
+            my $now=time;
+            my $since=$now-$mtime;
+            if ($since>$perlvar{'lonExpire'}) {
+                $cleaned++;
+                &log($fh,"Unlinking $fname<br />");
+                unlink("$fname");
+            } else {
+                $active++;
+            }
+        }
+    }
+    &log($fh,"<p>Cleaned up ".$cleaned." stale balancer files</p>");
+    &log($fh,"<h3>$active unexpired balancer files</h3>");
+}
+
 # ------------------------------------------------ clean out webDAV Session IDs
 sub clean_webDAV_sessionIDs {
     my ($fh)=@_;
@@ -563,16 +639,16 @@ sub rotate_lonnet_logs {
     print "Checking logs.\n";
     if (-e "$perlvar{'lonDaemons'}/logs/lonnet.log"){
 	open (DFH,"tail -n50 $perlvar{'lonDaemons'}/logs/lonnet.log|");
-	while (my $line=<DFH>) { 
+	while (my $line=<DFH>) {
 	    &log($fh,&encode_entities($line,'<>&"'));
 	}
 	close (DFH);
     }
     &log($fh,"</pre><h3>Perm Log</h3><pre>");
-    
+
     if (-e "$perlvar{'lonDaemons'}/logs/lonnet.perm.log") {
 	open(DFH,"tail -n10 $perlvar{'lonDaemons'}/logs/lonnet.perm.log|");
-	while (my $line=<DFH>) { 
+	while (my $line=<DFH>) {
 	    &log($fh,&encode_entities($line,'<>&"'));
 	}
 	close (DFH);
@@ -636,29 +712,199 @@ sub test_connections {
 
 # ------------------------------------------------------------ Delayed messages
 sub check_delayed_msg {
-    my ($fh)=@_;
+    my ($fh,$weightsref,$exclusionsref)=@_;
     &log($fh,'<hr /><a name="delayed" /><h2>Delayed Messages</h2>');
     print "Checking buffers.\n";
     
     &log($fh,'<h3>Scanning Permanent Log</h3>');
 
     my $unsend=0;
+    my $ignored=0;
 
-    my $dfh=IO::File->new("$perlvar{'lonDaemons'}/logs/lonnet.perm.log");
-    while (my $line=<$dfh>) {
-	my ($time,$sdf,$dserv,$dcmd)=split(/:/,$line);
-	if ($sdf eq 'F') { 
-	    my $local=localtime($time);
-	    &log($fh,"<b>Failed: $time, $dserv, $dcmd</b><br />");
-	    $warnings++;
-	}
-	if ($sdf eq 'S') { $unsend--; }
-	if ($sdf eq 'D') { $unsend++; }
+    my %hostname = &Apache::lonnet::all_hostnames();
+    my $numhosts = scalar(keys(%hostname));
+    my $checkbackwards = 0;
+    my $checkfrom = 0;
+    my $checkexcluded = 0;
+    my (%bymachine,%weights,%exclusions,%serverhomes);
+    if (ref($weightsref) eq 'HASH') {
+        %weights = %{$weightsref};
+    }
+    if (ref($exclusionsref) eq 'HASH') {
+        %exclusions = %{$exclusionsref};
+        if (keys(%exclusions)) {
+            $checkexcluded = 1;
+            %serverhomes = &read_serverhomeIDs();
+        }
     }
 
-    &log($fh,"<p>Total unsend messages: <b>$unsend</b></p>\n");
-    if ($unsend > 0) {
-        $warnings=$warnings+5*$unsend;
+#
+# For LON-CAPA 1.2.0 to 2.1.3 (release dates: 8/31/2004 and 3/31/2006) any
+# entry logged in lonnet.perm.log for completion of a delayed (critical)
+# transaction lacked the hostID for the remote node to which the command
+# to be completed was sent.
+#
+# Because of this, exclusion of items in lonnet.perm.log for nodes which are
+# no longer part of the cluster from adding to the overall "unsend" count
+# needs additional effort besides the changes made in loncron rev. 1.105.
+#
+# For "S" (completion) events logging in LON-CAPA 1.2.0 through 2.1.3 included
+# "LondTransaction=HASH(hexadecimal)->getClient() :$cmd, where the hexadecimal
+# is a memory location, and $cmd is the command sent to the remote node.
+#
+# Starting with 2.2.0 (released 8/21/2006) logging for "S" (completion) events
+# had sethost:$host_id:$cmd after LondTransaction=HASH(hexadecimal)->getClient()
+#
+# Starting with 2.4.1 (released 6/13/2007) logging for "S" replaced echoing the
+# getClient() call with the result of the Transaction->getClient() call itself
+# undef for completion of delivery of a delayed message.
+#
+# The net effect of these changes is that lonnet.perm.log is now accessed three
+# times: (a) oldest record is checked, if earlier than release date for 2.5.0
+# then (b) file is read backwards, with timestamp recorded for most recent
+# instance of logged "S" event for "update" command without "sethost:$host_id:"
+# then (c) file is read forward with records ignored which predate the timestamp
+# recorded in (b), if one was found.
+#
+# In (c), when calculating the unsend total, i.e., the difference between delayed
+# transactions ("D") and sent transactions ("S"), transactions are ignored if the
+# target node is no longer in the cluster, and also (for "update" commands), if
+# the target node is in the list of nodes excluded from the count, in the domain
+# configuration for this machine's default domain.  The idea here is to remove
+# delayed "update" commands for nodes for which inbound access to port 5663,
+# is blocked, but are still part of the LON-CAPA network, (i.e., they can still
+# replicate content from other nodes).
+#
+
+    my $dfh=IO::File->new("$perlvar{'lonDaemons'}/logs/lonnet.perm.log","r");
+    if (defined($dfh)) {
+        while (my $line=<$dfh>) {
+	    my ($time,$sdf,$rest)=split(/:/,$line,3);
+            if ($time < 1541185772) {
+                $checkbackwards = 1;
+            }
+            last;
+        }
+        undef $dfh;
+    }
+
+    if ($checkbackwards) {
+        if (tie *BW, 'File::ReadBackwards', "$perlvar{'lonDaemons'}/logs/lonnet.perm.log") {
+            while(my $line=<BW>) {
+                if ($line =~ /\QLondTransaction=HASH\E[^:]+:update:/) {
+                    ($checkfrom) = split(/:/,$line,2);
+                    last;
+                }
+            }
+            close(BW);
+        }
+    }
+    $dfh=IO::File->new("$perlvar{'lonDaemons'}/logs/lonnet.perm.log","r");
+    if (defined($dfh)) {
+        while (my $line=<$dfh>) {
+            my ($time,$sdf,$rest)=split(/:/,$line,3);
+            next unless (($sdf eq 'F') || ($sdf eq 'S') || ($sdf eq 'D'));
+            next if (($checkfrom) && ($time <= $checkfrom));
+            my ($dserv,$dcmd);
+            if ($sdf eq 'S') {
+                my ($serva,$cmda,$servb,$cmdb) = split(/:/,$rest);
+                if ($cmda eq 'sethost') {
+                    chomp($cmdb);
+                    $dcmd = $cmdb;
+                } else {
+                    $dcmd = $cmda;
+                }
+                if (($serva =~ /^LondTransaction/) || ($serva eq '')) {
+                    unless (($servb eq '') || ($servb =~ m{^/})) {
+                        $dserv = $servb;
+                    }
+                } else {
+                    $dserv = $serva;
+                }
+            } else {
+                ($dserv,$dcmd) = split(/:/,$rest);
+            }
+            if ($sdf eq 'F') {
+                my $local=localtime($time);
+                &log($fh,"<b>Failed: $time, $dserv, $dcmd</b><br />");
+                $warnings++;
+            }
+            next if ((($dserv eq '') || ($dcmd eq '')) && ($sdf ne 'F'));
+            if ($sdf eq 'S') {
+                if ($dcmd eq 'update') {
+                    if ($hostname{$dserv}) {
+                        if ($exclusions{$serverhomes{$hostname{$dserv}}}) {
+                            $ignored --;
+                        } else {
+                            $unsend --;
+                        }
+                    }
+                    if (exists($bymachine{$dserv})) {
+                        $bymachine{$dserv} --;
+                    } else {
+                        $bymachine{$dserv} = -1;
+                    }
+                } else {
+                    if ($hostname{$dserv}) {
+                        $unsend --;
+                    }
+                }
+            } elsif ($sdf eq 'D') {
+                if ($dcmd eq 'update') {
+                    if ($hostname{$dserv}) {
+                        if ($exclusions{$serverhomes{$hostname{$dserv}}}) {
+                            $ignored ++;
+                        } else {
+                            $unsend ++;
+                        }
+                    }
+                    if (exists($bymachine{$dserv})) {
+                        $bymachine{$dserv} ++;
+                    } else {
+                        $bymachine{$dserv} = 1;
+                    }
+                } else {
+                    if ($hostname{$dserv}) {
+                        $unsend ++;
+                    }
+                }
+            }
+        }
+        undef $dfh;
+        my $nodest = 0;
+        my $retired = 0;
+        my %active;
+        if (keys(%bymachine)) {
+            unless ($checkexcluded) {
+                %serverhomes = &read_serverhomeIDs();
+            }
+            foreach my $key (keys(%bymachine)) {
+                if ($bymachine{$key} > 0) {
+                    if ($hostname{$key}) {
+                        $active{$serverhomes{$hostname{$key}}} += $bymachine{$key};
+                    } else {
+                        $retired ++;
+                        $nodest += $bymachine{$key};
+                    }
+                }
+            }
+        }
+        if (keys(%active)) {
+            &log($fh,"<p>Unsend messages by node, active (undegraded) nodes in cluster</p>\n");
+            foreach my $key (sort(keys(%active))) {
+                &log($fh,&encode_entities("$key => $active{$key}",'<>&"')."\n");
+            }
+        }
+        &log($fh,"<p>Total unsend messages: <b>$unsend</b> for ".scalar(keys(%active))." active (undegraded) nodes in cluster.</p>\n");
+        if (keys(%exclusions) > 0) {
+            &log($fh,"<p>Total incomplete updates <b>$ignored</b> for ".scalar(keys(%exclusions))." degraded nodes in cluster.</p>\n");
+        }
+        if ($retired) {
+            &log($fh,"<p>Total unsent <b>$nodest</b> for $retired nodes no longer in cluster.</p>\n");
+        }
+        if ($unsend > 0) {
+            $warnings=$warnings+$weights{'U'}*$unsend;
+        }
     }
 
     if ($unsend) { $simplestatus{'unsend'}=$unsend; }
@@ -673,8 +919,6 @@ sub check_delayed_msg {
     }
     &log($fh,"</pre>\n");
     close (DFH);
-    my %hostname = &Apache::lonnet::all_hostnames();
-    my $numhosts = scalar(keys(%hostname));
 # pong to all servers that have delayed messages
 # this will trigger a reverse connection, which should flush the buffers
     foreach my $tryserver (sort(keys(%servers))) {
@@ -699,9 +943,13 @@ sub check_delayed_msg {
 }
 
 sub finish_logging {
-    my ($fh)=@_;
+    my ($fh,$weightsref)=@_;
+    my %weights;
+    if (ref($weightsref) eq 'HASH') {
+        %weights = %{$weightsref};
+    }
     &log($fh,"<a name='errcount' />\n");
-    $totalcount=$notices+4*$warnings+100*$errors;
+    $totalcount=($weights{'N'}*$notices)+($weights{'W'}*$warnings)+($weights{'E'}*$errors);
     &errout($fh);
     &log($fh,"<h1>Total Error Count: $totalcount</h1>");
     my $now=time;
@@ -770,7 +1018,7 @@ sub write_serverhomeIDs {
                 eval {
                     local $SIG{ ALRM } = sub { die "TIMEOUT" };
                     alarm(10);
-                    $serverhomeID = 
+                    $serverhomeID =
                         &Apache::lonnet::get_server_homeID($name,1,'loncron');
                     alarm(0);
                 };
@@ -815,12 +1063,366 @@ sub write_checksums {
     return;
 }
 
+sub write_hostips {
+    my $lontabdir = $perlvar{'lonTabDir'};
+    my $defdom = $perlvar{'lonDefDomain'};
+    my $lonhost = $perlvar{'lonHostID'};
+    my $newfile = "$lontabdir/currhostips.tab";
+    my $oldfile = "$lontabdir/prevhostips.tab";
+    my (%prevhosts,%currhosts,%ipchange);
+    if ((-e $newfile) && (-s $newfile)) {
+        move($newfile,$oldfile);
+        chmod(0644,$oldfile);
+        if (open(my $fh,'<',$oldfile)) {
+            while (my $line=<$fh>) {
+                chomp($line);
+                if ($line =~ /^([^:]+):([\d.]+)$/) {
+                    $prevhosts{$1} = $2;
+                }
+            }
+            close($fh);
+        }
+    }
+    my ($ip_info,$cached) =
+        &Apache::lonnet::is_cached_new('iphost','iphost');
+    if (!$cached) {
+        &Apache::lonnet::get_iphost();
+        ($ip_info,$cached) =
+        &Apache::lonnet::is_cached_new('iphost','iphost');
+    }
+    if (ref($ip_info) eq 'ARRAY') {
+        %currhosts = %{$ip_info->[1]};
+        if (open(my $fh,'>',$newfile)) {
+            foreach my $key (keys(%currhosts)) {
+                print $fh "$key:$currhosts{$key}\n";
+            }
+            close($fh);
+            chmod(0644,$newfile);
+        }
+    }
+    if (keys(%prevhosts) && keys(%currhosts)) {
+        foreach my $key (keys(%prevhosts)) {
+            unless ($currhosts{$key} eq $prevhosts{$key}) {
+                $ipchange{$key} = $prevhosts{$key}.' | '.$currhosts{$key};
+            }
+        }
+        foreach my $key (keys(%currhosts)) {
+            unless ($currhosts{$key} eq $prevhosts{$key}) {
+                $ipchange{$key} = $prevhosts{$key}.' | '.$currhosts{$key};
+            }
+        }
+    }
+    if (&Apache::lonnet::domain($defdom,'primary') eq $lonhost) {
+        if (keys(%ipchange)) {
+            if (open(my $fh,'>>',$perlvar{'lonDaemons'}.'/logs/hostip.log')) {
+               print $fh "********************\n".localtime(time).' Changes --'."\n".
+                         "| Hostname | Previous IP | New IP |\n".
+                         " --------------------------------- \n";
+               foreach my $hostname (sort(keys(%ipchange))) {
+                    print $fh "| $hostname | $ipchange{$hostname} |\n";
+                }
+                print $fh "\n*******************\n\n";
+                close($fh);
+            }
+            my $emailto = &Apache::loncommon::build_recipient_list(undef,
+                                   'hostipmail',$defdom);
+            if ($emailto) {
+                my $subject = "LON-CAPA Hostname to IP change ($perlvar{'lonHostID'})";
+                my $chgmail = "To: $emailto\n".
+                              "Subject: $subject\n".
+                              "Content-type: text/plain\; charset=UTF-8\n".
+                              "MIME-Version: 1.0\n\n".
+                              "Host/IP changes\n".
+                              " \n".
+                              "| Hostname | Previous IP | New IP |\n".
+                              " --------------------------------- \n";
+                foreach my $hostname (sort(keys(%ipchange))) {
+                    $chgmail .= "| $hostname | $ipchange{$hostname} |\n";
+                }
+                $chgmail .= "\n\n";
+                if (open(my $mailh, "|/usr/lib/sendmail -oi -t -odb")) {
+                    print $mailh $chgmail;
+                    close($mailh);
+                    print "Sending mail notification of hostname/IP changes.\n";
+                }
+            }
+        }
+    }
+    return;
+}
+
+sub get_domain_config {
+    my ($dom,$primlibserv,$isprimary,$url,%confhash);
+    $dom = $perlvar{'lonDefDomain'};
+    $primlibserv = &Apache::lonnet::domain($dom,'primary');
+    if ($primlibserv eq $perlvar{'lonHostID'}) {
+        $isprimary = 1;
+    } elsif ($primlibserv ne '') {
+        my $protocol = $Apache::lonnet::protocol{$primlibserv};
+        my $hostname = &Apache::lonnet::hostname($primlibserv);
+        unless ($protocol eq 'https') {
+            $protocol = 'http';
+        }
+        $url = $protocol.'://'.$hostname.'/cgi-bin/listdomconfig.pl?primary='.$primlibserv.'&format=raw';
+    }
+    if ($isprimary) {
+        my $lonusersdir = $perlvar{'lonUsersDir'};
+        my $fname = $lonusersdir.'/'.$dom.'/configuration.db';
+        if (-e $fname) {
+            my $dbref=&LONCAPA::locking_hash_tie($fname,&GDBM_READER());
+            if (ref($dbref) eq 'HASH') {
+                foreach my $key (sort(keys(%{$dbref}))) {
+                    my $value = $dbref->{$key};
+                    if ($value =~ s/^__FROZEN__//) {
+                        $value = thaw(&LONCAPA::unescape($value));
+                    } else {
+                        $value = &LONCAPA::unescape($value);
+                    }
+                    $confhash{$key} = $value;
+                }
+                &LONCAPA::locking_hash_untie($dbref);
+            }
+        }
+    } else {
+        my $ua=new LWP::UserAgent;
+        $ua->timeout(5);
+        my $request=new HTTP::Request('GET',$url);
+        my $response=$ua->request($request);
+        unless ($response->is_error()) {
+            my $content = $response->content;
+            if ($content) {
+                my @pairs=split(/\&/,$content);
+                foreach my $item (@pairs) {
+                    my ($key,$value)=split(/=/,$item,2);
+                    my $what = &LONCAPA::unescape($key);
+                    if ($value =~ s/^__FROZEN__//) {
+                        $value = thaw(&LONCAPA::unescape($value));
+                    } else {
+                        $value = &LONCAPA::unescape($value);
+                    }
+                    $confhash{$what}=$value;
+                }
+            }
+        }
+    }
+    return \%confhash;
+}
+
+sub get_permcount_settings {
+    my ($domconf) = @_;
+    my ($defaults,$names) = &Apache::loncommon::lon_status_items();
+    my (%weights,$threshold,$sysmail,$reportstatus,%exclusions);
+    foreach my $type ('E','W','N','U') {
+        $weights{$type} = $defaults->{$type};
+    }
+    $threshold = $defaults->{'threshold'};
+    $sysmail = $defaults->{'sysmail'};
+    $reportstatus = 1;
+    if (ref($domconf) eq 'HASH') {
+        if (ref($domconf->{'contacts'}) eq 'HASH') {
+            if ($domconf->{'contacts'}{'reportstatus'} == 0) {
+                $reportstatus = 0;
+            }
+            if (ref($domconf->{'contacts'}{'lonstatus'}) eq 'HASH') {
+                if (ref($domconf->{'contacts'}{'lonstatus'}{weights}) eq 'HASH') {
+                    foreach my $type ('E','W','N','U') {
+                        if (exists($domconf->{'contacts'}{'lonstatus'}{weights}{$type})) {
+                            $weights{$type} = $domconf->{'contacts'}{'lonstatus'}{weights}{$type};
+                        }
+                    }
+                }
+                if (ref($domconf->{'contacts'}{'lonstatus'}{'excluded'}) eq 'ARRAY') {
+                    my @excluded = @{$domconf->{'contacts'}{'lonstatus'}{'excluded'}};
+                    if (@excluded) {
+                        map { $exclusions{$_} = 1; } @excluded;
+                    }
+                }
+                if (exists($domconf->{'contacts'}{'lonstatus'}{'threshold'})) {
+                    $threshold = $domconf->{'contacts'}{'lonstatus'}{'threshold'};
+                }
+                if (exists($domconf->{'contacts'}{'lonstatus'}{'sysmail'})) {
+                    $sysmail = $domconf->{'contacts'}{'lonstatus'}{'sysmail'};
+                }
+            }
+        }
+    }
+    return ($threshold,$sysmail,$reportstatus,\%weights,\%exclusions);
+}
+
+sub read_serverhomeIDs {
+    my %server;
+    if (-e "$perlvar{'lonTabDir'}/serverhomeIDs.tab") {
+        if (open(my $fh,'<',"$perlvar{'lonTabDir'}/serverhomeIDs.tab")) {
+            while (<$fh>) {
+                my($host,$id) = split(/:/);
+                chomp($id);
+                $server{$host} = $id;
+            }
+            close($fh);
+        }
+    }
+    return %server;
+}
+
+sub check_bash_settings {
+    my $distro = &LONCAPA::distro();
+    my ($check_bracketed_paste,$bracketed_warning);
+    if ($distro  =~ /^debian(\d+)$/) {
+        if ($1 >= 12) {
+            $check_bracketed_paste = 1;
+        }
+    } elsif ($distro =~ /^ubuntu(\d+)$/) {
+        if ($1 >= 22) {
+            $check_bracketed_paste = 1;
+        }
+    } elsif ($distro =~ /^(?:redhat|oracle|alma|rocky|centos-stream)(\d+)$/) {
+        if ($1 >= 9) {
+            $check_bracketed_paste = 1;
+        }
+    } elsif ($distro =~ /^fedora(\d+)/) {
+        if ($1 >= 34) {
+            $check_bracketed_paste = 1;
+        }
+    }
+    if ($check_bracketed_paste) {
+        if (open(PIPE,"bind -V 2>&1 | grep enable-bracketed-paste |")) {
+            my $info = <PIPE>;
+            chomp($info);
+            my ($bracketed) = ($info =~ /^\Qenable-bracketed-paste\E\s+is\s+set\s+to\s+\W(on|off)\W$/);
+            close(PIPE);
+            if ($bracketed eq 'on') {
+                $bracketed_warning = 1;
+            }
+        } else {
+            print "Unable to check if bracketed paste is set to off for www user's shell\n";
+        }
+    }
+    return ($bracketed_warning,$check_bracketed_paste);
+}
+
+sub set_bracketed_paste_off {
+    my $bash_www_cnf = '/home/www/.inputrc';
+    my $result;
+    if (!-e $bash_www_cnf) {
+        system("touch $bash_www_cnf");
+        if (open(my $cfh,'>',$bash_www_cnf)) {
+            print $cfh <<'END';
+$if R
+    set enable-bracketed-paste off
+$endif
+
+$if maxima
+    set enable-bracketed-paste off
+$endif
+END
+            close($cfh);
+            $result = "Updated $bash_www_cnf so enable-bracketed-paste is off for R bash shell";
+        } else {
+            $result = "Could not open $bash_www_cnf to add 'set enable-bracketed-paste to off'";
+        }
+        my $wwwuid = getpwnam('www');
+        my $wwwgid = getgrnam('www');
+        if ($wwwuid!=$<) {
+            chown($wwwuid,$wwwgid,$bash_www_cnf);
+        }
+    } else {
+        my (%bracketed_paste_on,%bracketed_paste_off,@preserve,$condition);
+        $condition = '';
+        if (open(my $cfh,'<',$bash_www_cnf)) {
+            while (my $line=<$cfh>) {
+                chomp($line);
+                if ($line =~ /^\$if\s+(\w+)\s*$/) {
+                    if ($1 eq 'R') {
+                        $condition = 'r';
+                    } elsif ($1 eq 'maxima') {
+                        $condition = 'maxima';
+                    } else {
+                        $condition = 'other';
+                    }
+                } elsif ($line =~ /^\$endif\s*$/) {
+                    $condition = '';
+                }
+                if ($line =~ /^\s*set\s+enable\-bracketed\-paste\s+(off|on)\s*$/) {
+                    if ($1 eq 'off') {
+                        if ($condition ne '') {
+                            $bracketed_paste_off{$condition} = 1;
+                        } else {
+                            $bracketed_paste_off{all} = 1;
+                        }
+                        push(@preserve,$line);
+                    } else {
+                        if ($condition ne '') {
+                            $bracketed_paste_on{$condition} = 1;
+                            if (($condition eq 'r') || ($condition eq 'maxima')) {
+                                push(@preserve,'    set enable-bracketed-paste off');
+                            } else {
+                                push(@preserve,$line);
+                            }
+                        } else {
+                            $bracketed_paste_on{all} = 1;
+                            push(@preserve,$line);
+                        }
+                    }
+                } else {
+                    push(@preserve,$line);
+                }
+            }
+            close($cfh);
+        } else {
+            $result = "Could not open $bash_www_cnf to check if a value is included for 'enable-bracketed-paste'.";
+        }
+        if (($bracketed_paste_on{r} || $bracketed_paste_on{maxima}) ||
+            (!exists($bracketed_paste_off{r}) && !exists($bracketed_paste_on{r}) &&
+             !exists($bracketed_paste_off{maxima}) && !exists($bracketed_paste_on{maxima}))) {
+            if (open(my $cfh,'>',$bash_www_cnf)) {
+                if (@preserve) {
+                    foreach my $entry (@preserve) {
+                        print $cfh "$entry\n";
+                    }
+                    if (!exists($bracketed_paste_off{r}) && !exists($bracketed_paste_on{r})) {
+print $cfh <<'END';
+$if R
+    set enable-bracketed-paste off
+$endif
+END
+                    }
+                    if (!exists($bracketed_paste_off{r}) && !exists($bracketed_paste_on{r})) {
+print $cfh <<'END';
+$if maxima
+    set enable-bracketed-paste off
+$endif
+END
+                    }
+                } else {
+print $cfh <<'END';
+$if R
+    set enable-bracketed-paste off
+$endif
+
+$if maxima
+    set enable-bracketed-paste off
+$endif
+END
+                }
+                close($cfh);
+                $result = "Updated $bash_www_cnf";
+            } else {
+                $result = "Could not open $bash_www_cnf to add 'set enable-bracketed-paste to off'";
+            }
+        } else {
+            $result = "No action needed; $bash_www_cnf already includes 'set enable-bracketed-paste to off'";
+        }
+    }
+    return $result;
+}
+
 sub send_mail {
+    my ($sysmail,$reportstatus) = @_;
     my $defdom = $perlvar{'lonDefDomain'};
     my $origmail = $perlvar{'lonAdmEMail'};
     my $emailto = &Apache::loncommon::build_recipient_list(undef,
                                    'lonstatusmail',$defdom,$origmail);
-    if ($totalcount>2500) {
+    if (($totalcount>$sysmail) && ($reportstatus)) {
 	$emailto.=",$perlvar{'lonSysEMail'}";
     }
     my $from;
@@ -873,19 +1475,23 @@ Options:
 				do not send emails do not
                                 check if the daemons are running, do not
                                 generate lon-status
-                           
+   --justiptables          Only update the dynamic iptables rules for the
+                                lond port; do not send emails, do not
+                                check if the daemons are running, do not
+                                generate lon-status
 USAGE
 }
 
 # ================================================================ Main Program
 sub main () {
     my ($help,$justcheckdaemons,$noemail,$justcheckconnections,
-	$justreload);
+	$justreload,$justiptables);
     &GetOptions("help"                 => \$help,
 		"justcheckdaemons"     => \$justcheckdaemons,
 		"noemail"              => \$noemail,
 		"justcheckconnections" => \$justcheckconnections,
-		"justreload"           => \$justreload
+		"justreload"           => \$justreload,
+                "justiptables"         => \$justiptables
 		);
     if ($help) { &usage(); return; }
 # --------------------------------- Read loncapa_apache.conf and loncapa.conf
@@ -900,12 +1506,13 @@ sub main () {
     if ('{[[[[lonHostID]]]]}' eq $perlvar{'lonHostID'}) {
 	print("Unconfigured machine.\n");
 	my $emailto=$perlvar{'lonSysEMail'};
-	my $hostname=`/bin/hostname`;
-	chop $hostname;
-	$hostname=~s/[^\w\.]//g; # make sure is safe to pass through shell
+	my $hostname = Sys::Hostname::FQDN::fqdn();
+	$hostname=~s/\.+/./g;
+	$hostname=~s/\-+/-/g;
+	$hostname=~s/[^\w\.-]//g; # make sure is safe to pass through shell
 	my $subj="LON: Unconfigured machine $hostname";
-	system("echo 'Unconfigured machine $hostname.' |\
- mailto $emailto -s '$subj' > /dev/null");
+	system("echo 'Unconfigured machine $hostname.' |".
+               " mail -s '$subj' $emailto > /dev/null");
 	exit 1;
     }
 
@@ -913,10 +1520,10 @@ sub main () {
     my $wwwid=getpwnam('www');
     if ($wwwid!=$<) {
 	print("User ID mismatch. This program must be run as user 'www'.\n");
-	my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
+	my $emailto="$perlvar{'lonAdmEMail'} $perlvar{'lonSysEMail'}";
 	my $subj="LON: $perlvar{'lonHostID'} User ID mismatch";
-	system("echo 'User ID mismatch. loncron must be run as user www.' |\
- mailto $emailto -s '$subj' > /dev/null");
+	system("echo 'User ID mismatch. loncron must be run as user www.' |".
+               " mail -s '$subj' $emailto > /dev/null");
 	exit 1;
     }
 
@@ -935,11 +1542,13 @@ sub main () {
             }
         }
     }
-    &Apache::lonnet::load_hosts_tab(1,$nomemcache);
-    &Apache::lonnet::load_domain_tab(1,$nomemcache);
-    &Apache::lonnet::get_iphost(1,$nomemcache);
+    if (!$justiptables) {
+        &Apache::lonnet::load_hosts_tab(1,$nomemcache);
+        &Apache::lonnet::load_domain_tab(1,$nomemcache);
+        &Apache::lonnet::get_iphost(1,$nomemcache);
+    }
 
-# ----------------------------------------- Force firewall update for lond port  
+# ----------------------------------------- Force firewall update for lond port
 
     if ((!$justcheckdaemons) && (!$justreload)) {
         my $now = time;
@@ -954,7 +1563,7 @@ sub main () {
             if (&LONCAPA::try_to_lock('/tmp/lock_lciptables')) {
                 my $execpath = $perlvar{'lonDaemons'}.'/lciptables';
                 system("$execpath $tmpfile");
-                unlink('/tmp/lock_lciptables');  # Remove the lock file. 
+                unlink('/tmp/lock_lciptables');  # Remove the lock file.
             }
             unlink($tmpfile);
         }
@@ -966,20 +1575,21 @@ sub main () {
     $warnings=0;
     $notices=0;
 
-	
+
     my $fh;
-    if (!$justcheckdaemons && !$justcheckconnections && !$justreload) {
+    if (!$justcheckdaemons && !$justcheckconnections && !$justreload && !$justiptables) {
 	$fh=&start_logging();
 
 	&log_machine_info($fh);
 	&clean_tmp($fh);
 	&clean_lonIDs($fh);
+        &clean_balanceIDs($fh);
         &clean_webDAV_sessionIDs($fh);
 	&check_httpd_logs($fh);
 	&rotate_lonnet_logs($fh);
 	&rotate_other_logs($fh);
     }
-    if (!$justcheckconnections && !$justreload) {
+    if (!$justcheckconnections && !$justreload && !$justiptables) {
 	&checkon_daemon($fh,'lonmemcached',40000);
 	&checkon_daemon($fh,'lonsql',200000);
 	if ( &checkon_daemon($fh,'lond',40000,'USR1') eq 'running') {
@@ -996,14 +1606,44 @@ sub main () {
     if ($justcheckconnections) {
 	&test_connections($fh);
     }
-    if (!$justcheckdaemons && !$justcheckconnections && !$justreload) {
-	&check_delayed_msg($fh);
-	&finish_logging($fh);
+    if (!$justcheckdaemons && !$justcheckconnections && !$justreload && !$justiptables) {
+        my ($bracketed_warning,$check_bracketed_paste) = &check_bash_settings();
+        if ($check_bracketed_paste) {
+           &log($fh,'<hr /><a name="bashconf" /><h2>bash readline config</h2><h3>Bracketed Paste</h3>'.
+                '<p>Distros using bash readline library 8.1 or later need bracketed paste disabled for the R bash shell for the www user so R commands sent to lonr daemon will be processed.</p>');
+           my $bash_www_cnf = '/home/www/.inputrc';
+           my $non_empty_conffile;
+           unless ($bracketed_warning) {
+               if (-e $bash_www_cnf) {
+                   my $filesize = (stat($bash_www_cnf))[7];
+                   if ($filesize > 0) {
+                       $non_empty_conffile = 1;
+                   }
+               }
+           }
+           if (($bracketed_warning) || ($non_empty_conffile)) {
+               my $bash_update = &set_bracketed_paste_off();
+               if ($bash_update) {
+                   &log($fh,'<p>'.$bash_update.'</p>'."\n");
+               }
+           } else {
+               &log($fh,'<p>No action needed; /home/www/.inputrc already set.</p>'."\n");
+           }
+        } else {
+            &log($fh,'<hr /><a name="bashconf" /><h2>bash readline config</h2><h3>Bracketed Paste</h3>'.
+                     '<p>No action needed for distros using pre-8.1 bash readline library</p>'."\n");
+        }
+        my $domconf = &get_domain_config();
+        my ($threshold,$sysmail,$reportstatus,$weightsref,$exclusionsref) =
+            &get_permcount_settings($domconf);
+	&check_delayed_msg($fh,$weightsref,$exclusionsref);
+	&finish_logging($fh,$weightsref);
 	&log_simplestatus();
         &write_loncaparevs();
         &write_serverhomeIDs();
 	&write_checksums();
-	if ($totalcount>200 && !$noemail) { &send_mail(); }
+        &write_hostips();
+        if ($totalcount>$threshold && !$noemail) { &send_mail($sysmail,$reportstatus); }
     }
 }