--- loncom/interface/domainprefs.pm	2014/07/15 20:04:03	1.248
+++ loncom/interface/domainprefs.pm	2015/03/03 22:06:50	1.256
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Handler to set domain-wide configuration settings
 #
-# $Id: domainprefs.pm,v 1.248 2014/07/15 20:04:03 raeburn Exp $
+# $Id: domainprefs.pm,v 1.256 2015/03/03 22:06:50 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -250,6 +250,8 @@ sub handler {
                       header => [{col1 => 'Log-in Page Items',
                                   col2 => '',},
                                  {col1 => 'Log-in Help',
+                                  col2 => 'Value'},
+                                 {col1 => 'Custom HTML in document head',
                                   col2 => 'Value'}],
                       print => \&print_login,
                       modify => \&modify_login,
@@ -479,6 +481,8 @@ sub handler {
                                        {col1 => 'Log-in Page Items',
                                         col2 => ''},
                                        {col1 => 'Log-in Help',
+                                        col2 => 'Value'},
+                                       {col1 => 'Custom HTML in document head',
                                         col2 => 'Value'}],
                             print => \&print_login,
                             modify => \&modify_login,
@@ -670,7 +674,7 @@ sub print_config_box {
         my $colspan = '';
         my $rightcolspan = '';
         if (($action eq 'rolecolors') || ($action eq 'defaults') ||
-            (($action eq 'login') && ($numheaders < 3))) {
+            (($action eq 'login') && ($numheaders < 4))) {
             $colspan = ' colspan="2"';
         }
         if ($action eq 'usersessions') {
@@ -692,7 +696,7 @@ sub print_config_box {
         } elsif ($action eq 'coursecategories') {
             $output .= $item->{'print'}->('top',$dom,$item,$settings,\$rowtotal);
         } elsif ($action eq 'login') {
-            if ($numheaders == 3) {
+            if ($numheaders == 4) {
                 $colspan = ' colspan="2"';
                 $output .= &print_login('service',$dom,$confname,$phase,$settings,\$rowtotal);
             } else {
@@ -745,7 +749,7 @@ sub print_config_box {
                   ($action eq 'defaults')) {
             $output .= $item->{'print'}->('bottom',$dom,$settings,\$rowtotal);
         } elsif ($action eq 'login') {
-            if ($numheaders == 3) {
+            if ($numheaders == 4) {
                 $output .= &print_login('page',$dom,$confname,$phase,$settings,\$rowtotal).'
            </table>
           </td>
@@ -761,6 +765,27 @@ sub print_config_box {
             } else {
                 $output .= &print_login('help',$dom,$confname,$phase,$settings,\$rowtotal);
             }
+            $output .= '
+           </table>
+          </td>
+         </tr>
+         <tr>
+           <td>
+            <table class="LC_nested">
+             <tr class="LC_info_row">';
+            if ($numheaders == 4) {
+                $output .= '
+              <td class="LC_left_item"'.$colspan.'>'.&mt($item->{'header'}->[3]->{'col1'}).'</td>
+              <td class="LC_right_item"'.$colspan.'>'.&mt($item->{'header'}->[3]->{'col2'}).'</td>
+             </tr>';
+            } else {
+                $output .= '
+              <td class="LC_left_item"'.$colspan.'>'.&mt($item->{'header'}->[2]->{'col1'}).'</td>
+              <td class="LC_right_item"'.$colspan.'>'.&mt($item->{'header'}->[2]->{'col2'}).'</td>
+             </tr>';
+            }
+            $rowtotal ++;
+            $output .= &print_login('headtag',$dom,$confname,$phase,$settings,\$rowtotal);
         } elsif ($action eq 'requestcourses') {
             $output .= &print_requestmail($dom,$action,$settings,\$rowtotal);
             $rowtotal ++;
@@ -1181,6 +1206,57 @@ sub print_login {
             $itemcount ++;
         }
         $datatable .= &captcha_choice('login',$settings,$itemcount);
+    } elsif ($caller eq 'headtag') {
+        my %domservers = &Apache::lonnet::get_servers($dom);
+        my $choice = $choices{'headtag'};
+        $css_class = ' class="LC_odd_row"';
+        $datatable .= '<tr'.$css_class.'><td colspan="2">'.$choice.'</td>'.
+                      '<td align="left"><table><tr><th>'.$choices{'hostid'}.'</th>'.
+                      '<th>'.$choices{'current'}.'</th>'.
+                      '<th>'.$choices{'action'}.'</th>'.
+                      '<th>'.$choices{'exempt'}.'</th></tr>'."\n";
+        my (%currurls,%currexempt);
+        if (ref($settings) eq 'HASH') {
+            if (ref($settings->{'headtag'}) eq 'HASH') {
+                foreach my $lonhost (keys(%{$settings->{'headtag'}})) {
+                    if (ref($settings->{'headtag'}{$lonhost}) eq 'HASH') {
+                        $currurls{$lonhost} = $settings->{'headtag'}{$lonhost}{'url'};
+                        $currexempt{$lonhost} = $settings->{'headtag'}{$lonhost}{'exempt'};
+                    }
+                }
+            }
+        }
+        my %lt = &Apache::lonlocal::texthash(
+                                               del  => 'Delete?',
+                                               rep  => 'Replace:',
+                                               upl  => 'Upload:',
+                                               curr => 'View contents',
+                                               none => 'None',
+        );
+        my $switchserver = &check_switchserver($dom,$confname);
+        foreach my $lonhost (sort(keys(%domservers))) {
+            my $exempt = &check_exempt_addresses($currexempt{$lonhost});
+            $datatable .= '<tr><td>'.$domservers{$lonhost}.'</td>';
+            if ($currurls{$lonhost}) {
+                $datatable .= '<td class="LC_right_item"><a href="'.
+                              "javascript:void(open('$currurls{$lonhost}?inhibitmenu=yes','Custom_HeadTag',
+                              'menubar=0,toolbar=1,scrollbars=1,width=600,height=500,resizable=yes'))".
+                              '">'.$lt{'curr'}.'</a></td>'.
+                              '<td><span class="LC_nobreak"><label>'.
+                              '<input type="checkbox" name="loginheadtag_del" value="'.$lonhost.'" />'.
+                              $lt{'del'}.'</label>&nbsp;'.$lt{'rep'}.'</span>';
+            } else {
+                $datatable .= '<td class="LC_right_item">'.$lt{'none'}.'</td><td>'.$lt{'upl'};
+            }
+            $datatable .='<br />';
+            if ($switchserver) {
+                $datatable .= &mt('Upload to library server: [_1]',$switchserver);
+            } else {
+                $datatable .= '<input type="file" name="loginheadtag_'.$lonhost.'" />';
+            }
+            $datatable .= '</td><td><input type="textbox" name="loginheadtagexempt_'.$lonhost.'" value="'.$exempt.'" /></td></tr>';
+        }
+        $datatable .= '</table></td></tr>';
     }
     return $datatable;
 }
@@ -1214,6 +1290,9 @@ sub login_choices {
             link          => "Link",
             alink         => "Active link",
             vlink         => "Visited link",
+            headtag       => "Custom markup",
+            action        => "Action",
+            current       => "Current",
         );
     return %choices;
 }
@@ -3661,9 +3740,10 @@ sub print_loadbalancing {
                     $disabled = ' disabled="disabled"';
                 }
                 $targettable .=
-                    '<td><label><input type="checkbox" name="loadbalancing_target_'.$balnum.'_'.$sparetype.'"'.
+                    '<td><span class="LC_nobreak"><label>'.
+                    '<input type="checkbox" name="loadbalancing_target_'.$balnum.'_'.$sparetype.'"'.
                     $checked.$disabled.' value="'.$chkboxval.'" id="loadbalancing_target_'.$balnum.'_'.$sparetype.'_'.$i.'" onclick="checkOffloads('."this,'$balnum','$sparetype'".');" /><span id="loadbalancing_targettxt_'.$balnum.'_'.$sparetype.'_'.$i.'">&nbsp;'.$chkboxval.
-                    '</span></label></td>';
+                    '</span></label></span></td>';
                 my $rem = $i%($numinrow);
                 if ($rem == 0) {
                     if (($i > 0) && ($i < $numspares-1)) {
@@ -3753,7 +3833,7 @@ sub loadbalancing_rules {
             if (ref($currrules) eq 'HASH') {
                 $current = $currrules->{$type};
             }
-            if (($type eq '_LC_external') || ($type eq '_LC_internetdom') || ($type eq '_LC_ipchange')) {
+            if (($type eq '_LC_external') || ($type eq '_LC_internetdom')) {
                 if ($dom ne &Apache::lonnet::host_domain($lonhost)) {
                     $current = '';
                 }
@@ -3805,7 +3885,7 @@ sub loadbalance_rule_row {
     my @rulenames;
     my %ruletitles = &offloadtype_text();
     if (($type eq '_LC_ipchangesso') || ($type eq '_LC_ipchange')) {
-        @rulenames = ('balancer','offloadedto');
+        @rulenames = ('balancer','offloadedto','specific');
     } else {
         @rulenames = ('default','homeserver');
         if ($type eq '_LC_external') {
@@ -3816,7 +3896,7 @@ sub loadbalance_rule_row {
         push(@rulenames,'none');
     }
     my $style = $targets_div_style;
-    if (($type eq '_LC_external') || ($type eq '_LC_internetdom') || ($type eq '_LC_ipchange')) {
+    if (($type eq '_LC_external') || ($type eq '_LC_internetdom')) {
         $style = $homedom_div_style;
     }
     my $space;
@@ -3867,8 +3947,13 @@ sub loadbalance_rule_row {
                    '<input type="radio" name="loadbalancing_rules_'.$balnum.'_'.$type.
                    '" id="loadbalancing_rules_'.$balnum.'_'.$type.'_'.$i.'" value="'.
                    $rule.'" onclick="balanceruleChange('."this.form,'$balnum','$type'".
-                   ')"'.$checked.' />&nbsp;'.$ruletitles{$rulenames[$i]}.
-                   '</label>'.$extra.'</span><br />'."\n";
+                   ')"'.$checked.' />&nbsp;';
+        if (($rulenames[$i] eq 'specific') && ($type =~ /^_LC_ipchange/)) {
+            $output .= $ruletitles{'particular'};
+        } else {
+            $output .= $ruletitles{$rulenames[$i]};
+        }
+        $output .= '</label>'.$extra.'</span><br />'."\n";
     }
     $output .= '</div></td></tr>'."\n";
     return $output;
@@ -3883,6 +3968,7 @@ sub offloadtype_text {
            'none'             => 'No offload',
            'balancer'         => 'Session hosted on Load Balancer, after re-authentication',
            'offloadedto'      => 'Session hosted on offload server, after re-authentication',
+           'particular'       => 'Session hosted (after re-auth) on server:',
     );
     return %ruletitles;
 }
@@ -5172,7 +5258,6 @@ sub serverstatus_pages {
 
 sub defaults_javascript {
     my ($settings) = @_;
-    my ($output,$jstext);
     return unless (ref($settings) eq 'HASH'); 
     if ((ref($settings->{'inststatusorder'}) eq 'ARRAY') && (ref($settings->{'inststatustypes'}) eq 'HASH')) {
         my $maxnum = scalar(@{$settings->{'inststatusorder'}});
@@ -5180,7 +5265,7 @@ sub defaults_javascript {
             $maxnum = 0;
         }
         $maxnum ++;
-        $jstext = '    var inststatuses = Array('."'".join("','",@{$settings->{'inststatusorder'}})."'".');';  
+        my $jstext = '    var inststatuses = Array('."'".join("','",@{$settings->{'inststatusorder'}})."'".');';  
         return <<"ENDSCRIPT";
 <script type="text/javascript">
 // <![CDATA[
@@ -5773,6 +5858,7 @@ sub modify_login {
     }
 
     my %servers = &Apache::lonnet::internet_dom_servers($dom);
+    my %domservers = &Apache::lonnet::get_servers($dom);
     my @loginvia_attribs = ('serverpath','custompath','exempt');
     if (keys(%servers) > 1) {
         foreach my $lonhost (keys(%servers)) {
@@ -5815,22 +5901,7 @@ sub modify_login {
                             $changes{'loginvia'}{$lonhost} = 1;
                         }
                         if ($item eq 'exempt') {
-                            $new =~ s/^\s+//;
-                            $new =~ s/\s+$//;
-                            my @poss_ips = split(/\s*[,:]\s*/,$new);
-                            my @okips;
-                            foreach my $ip (@poss_ips) {
-                                if ($ip =~ /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/) {
-                                    if (($1 <= 255) && ($2 <= 255) && ($3 <= 255) && ($4 <= 255)) {
-                                        push(@okips,$ip); 
-                                    }
-                                }
-                            }
-                            if (@okips > 0) {
-                                $new = join(',',@okips); 
-                            } else {
-                                $new = ''; 
-                            }
+                            $new = &check_exempt_addresses($new);
                         }
                         $loginhash{login}{loginvia}{$lonhost}{$item} = $new;
                     }
@@ -5926,7 +5997,6 @@ sub modify_login {
                         $errors .= '<li><span class="LC_error">'.$puberror.'</span></li>';
                         if ((grep(/^\Q$lang\E$/,@currlangs)) &&
                             (!grep(/^\Q$lang\E$/,@delurls))) {
-
                             $loginhash{'login'}{'helpurl'}{$lang} = $domconfig{'login'}{'helpurl'}{$lang};
                         }
                     }
@@ -5942,6 +6012,84 @@ sub modify_login {
             $errors .= '<li><span class="LC_error">'.$error.'</span></li>';
         }
     }
+
+    my (%currheadtagurls,%currexempt,@newhosts,%newheadtagurls,%possexempt);
+    if (ref($domconfig{'login'}) eq 'HASH') {
+        if (ref($domconfig{'login'}{'headtag'}) eq 'HASH') {
+            foreach my $lonhost (keys(%{$domconfig{'login'}{'headtag'}})) {
+                if ($domservers{$lonhost}) {
+                    if (ref($domconfig{'login'}{'headtag'}{$lonhost}) eq 'HASH') {
+                        $currheadtagurls{$lonhost} = $domconfig{'login'}{'headtag'}{$lonhost}{'url'};
+                        $currexempt{$lonhost} = $domconfig{'login'}{'headtagexempt'}{$lonhost}{'exempt'}
+                    }
+                }
+            }
+        }
+    }
+    my @delheadtagurls = &Apache::loncommon::get_env_multiple('form.loginheadtag_del');
+    foreach my $lonhost (sort(keys(%domservers))) {
+        if (grep(/^\Q$lonhost\E$/,@delheadtagurls)) {
+            $changes{'headtag'}{$lonhost} = 1;
+        } else {
+            if ($env{'form.loginheadtagexempt_'.$lonhost}) {
+                $possexempt{$lonhost} = &check_exempt_addresses($env{'form.loginheadtagexempt_'.$lonhost});
+            }
+            if ($env{'form.loginheadtag_'.$lonhost.'.filename'}) {
+                push(@newhosts,$lonhost);
+            } elsif ($currheadtagurls{$lonhost}) {
+                $loginhash{'login'}{'headtag'}{$lonhost}{'url'} = $currheadtagurls{$lonhost};
+                if ($currexempt{$lonhost}) {
+                    if ((!exists($possexempt{$lonhost})) || ($possexempt{$lonhost} ne $currexempt{$lonhost})) { 
+                        $changes{'headtag'}{$lonhost} = 1;
+                    }
+                } elsif ($possexempt{$lonhost}) {
+                    $changes{'headtag'}{$lonhost} = 1;
+                }
+                if ($possexempt{$lonhost}) {
+                    $loginhash{'login'}{'headtag'}{$lonhost}{'exempt'} = $possexempt{$lonhost};
+                }
+            }
+        }
+    }
+    if (@newhosts) {
+        my $error;
+        my ($configuserok,$author_ok,$switchserver) = &config_check($dom,$confname,$servadm);
+        if ($configuserok eq 'ok') {
+            if ($switchserver) {
+                $error = &mt("Upload of custom markup is not permitted to this server: [_1]",$switchserver);
+            } elsif ($author_ok eq 'ok') {
+                foreach my $lonhost (@newhosts) {
+                    my $formelem = 'loginheadtag_'.$lonhost;
+                    (my $result,$newheadtagurls{$lonhost}) = &publishlogo($r,'upload',$formelem,$dom,$confname,
+                                                                          "login/headtag/$lonhost",'','',
+                                                                          $env{'form.loginheadtag_'.$lonhost.'.filename'});
+                    if ($result eq 'ok') {
+                        $loginhash{'login'}{'headtag'}{$lonhost}{'url'} = $newheadtagurls{$lonhost};
+                        $changes{'headtag'}{$lonhost} = 1;
+                        if ($possexempt{$lonhost}) {
+                            $loginhash{'login'}{'headtag'}{$lonhost}{'exempt'} = $possexempt{$lonhost};
+                        }
+                    } else {
+                        my $puberror = &mt("Upload of [_1] failed because an error occurred publishing the file in RES space. Error was: [_2].",
+                                           $newheadtagurls{$lonhost},$result);
+                        $errors .= '<li><span class="LC_error">'.$puberror.'</span></li>';
+                        if ((grep(/^\Q$lonhost\E$/,keys(%currheadtagurls))) &&
+                            (!grep(/^\Q$lonhost\E$/,@delheadtagurls))) {
+                            $loginhash{'login'}{'headtag'}{$lonhost} = $currheadtagurls{$lonhost};
+                        }
+                    }
+                }
+            } else {
+                $error = &mt("Upload of custom markup file(s) failed because an author role could not be assigned to a Domain Configuration user ([_1]) in domain: [_2].  Error was: [_3].",$confname,$dom,$author_ok);
+            }
+        } else {
+            $error = &mt("Upload of custom markup file(s) failed because a Domain Configuration user ([_1]) could not be created in domain: [_2].  Error was: [_3].",$confname,$dom,$configuserok);
+        }
+        if ($error) {
+            &Apache::lonnet::logthis($error);
+            $errors .= '<li><span class="LC_error">'.$error.'</span></li>';
+        }
+    }
     &process_captcha('login',\%changes,$loginhash{'login'},$domconfig{'login'});
 
     my $defaulthelpfile = '/adm/loginproblems.html';
@@ -6042,6 +6190,25 @@ sub modify_login {
                             }
                         }
                     }
+                } elsif ($item eq 'headtag') {
+                    if (ref($changes{$item}) eq 'HASH') {
+                        foreach my $lonhost (sort(keys(%{$changes{$item}}))) {
+                            if (grep(/^\Q$lonhost\E$/,@delheadtagurls)) {
+                                $resulttext .= '<li>'.&mt('custom markup file removed for [_1]',$domservers{$lonhost}).'</li>';
+                            } elsif (ref($loginhash{'login'}{'headtag'}{$lonhost}) eq 'HASH') {
+                                $resulttext .= '<li><a href="'.
+                                               "javascript:void(open('$loginhash{'login'}{'headtag'}{$lonhost}{'url'}?inhibitmenu=yes','Custom_HeadTag',
+                                               'menubar=0,toolbar=1,scrollbars=1,width=600,height=500,resizable=yes'))".
+                                               '">'.&mt('custom markup').'</a> '.&mt('(for [_1])',$servers{$lonhost}).' ';
+                                if ($possexempt{$lonhost}) {
+                                    $resulttext .= &mt('not included for client IP(s): [_1]',$possexempt{$lonhost});
+                                } else {
+                                    $resulttext .= &mt('included for any client IP');
+                                }
+                                $resulttext .= '</li>';
+                            }
+                        }
+                    }
                 } elsif ($item eq 'captcha') {
                     if (ref($loginhash{'login'}) eq 'HASH') {
                         my $chgtxt;
@@ -6073,7 +6240,7 @@ sub modify_login {
                         if (!$privkey) {
                             $chgtxt .= '<li>'.&mt('Private key deleted').'</li>';
                         } else {
-                            $chgtxt .= '<li>'.&mt('Private key set to [_1]',$pubkey).'</li>';
+                            $chgtxt .= '<li>'.&mt('Private key set to [_1]',$privkey).'</li>';
                         }
                         $chgtxt .= '</ul>';
                         $resulttext .= '<li>'.$chgtxt.'</li>';
@@ -6097,6 +6264,28 @@ sub modify_login {
     return $resulttext;
 }
 
+
+sub check_exempt_addresses {
+    my ($iplist) = @_;
+    $iplist =~ s/^\s+//;
+    $iplist =~ s/\s+$//;
+    my @poss_ips = split(/\s*[,:]\s*/,$iplist);
+    my (@okips,$new);
+    foreach my $ip (@poss_ips) {
+        if ($ip =~ /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/) {
+            if (($1 <= 255) && ($2 <= 255) && ($3 <= 255) && ($4 <= 255)) {
+                push(@okips,$ip);
+            }
+        }
+    }
+    if (@okips > 0) {
+        $new = join(',',@okips);
+    } else {
+        $new = '';
+    }
+    return $new;
+}
+
 sub color_font_choices {
     my %choices =
         &Apache::lonlocal::texthash (
@@ -9077,8 +9266,8 @@ sub process_captcha {
     if ($newsettings->{'captcha'} eq 'recaptcha') {
         $newpub = $env{'form.'.$container.'_recaptchapub'};
         $newpriv = $env{'form.'.$container.'_recaptchapriv'};
-        $newpub =~ s/\W//g;
-        $newpriv =~ s/\W//g;
+        $newpub =~ s/[^\w\-]//g;
+        $newpriv =~ s/[^\w\-]//g;
         $newsettings->{'recaptchakeys'} = {
                                              public  => $newpub,
                                              private => $newpriv,
@@ -10681,6 +10870,7 @@ sub modify_loadbalancing {
     my ($othertitle,$usertypes,$types) =
         &Apache::loncommon::sorted_inst_types($dom);
     my %servers = &Apache::lonnet::internet_dom_servers($dom);
+    my %libraryservers = &Apache::lonnet::get_servers($dom,'library');
     my @sparestypes = ('primary','default');
     my %typetitles = &sparestype_titles();
     my $resulttext;
@@ -10772,7 +10962,10 @@ sub modify_loadbalancing {
                     $rule = $env{'form.loadbalancing_rules_'.$i.'_'.$type};
                 }
                 if ($rule eq 'specific') {
-                    $rule = $env{'form.loadbalancing_singleserver_'.$i.'_'.$type};
+                    my $specifiedhost = $env{'form.loadbalancing_singleserver_'.$i.'_'.$type};
+                    if (exists($servers{$specifiedhost})) { 
+                        $rule = $specifiedhost;
+                    }
                 }
                 $defaultshash{'loadbalancing'}{$balancer}{'rules'}{$type} = $rule;
                 if (ref($currrules{$balancer}) eq 'HASH') {
@@ -10794,20 +10987,22 @@ sub modify_loadbalancing {
                                                  \%defaultshash,$dom);
         if ($putresult eq 'ok') {
             if (keys(%changes) > 0) {
+                my %toupdate;
                 if (ref($changes{'delete'}) eq 'ARRAY') {
                     foreach my $balancer (sort(@{$changes{'delete'}})) {
                         $resulttext .= '<li>'.&mt('Load Balancing discontinued for: [_1]',$balancer).'</li>';
-                        my $cachekey = &escape('loadbalancing').':'.&escape($dom);
-                        &Apache::lonnet::remote_devalidate_cache($balancer,[$cachekey]);
+                        $toupdate{$balancer} = 1;
                     }
                 }
                 if (ref($changes{'add'}) eq 'ARRAY') {
                     foreach my $balancer (sort(@{$changes{'add'}})) {
                         $resulttext .= '<li>'.&mt('Load Balancing enabled for: [_1]',$balancer);
+                        $toupdate{$balancer} = 1;
                     }
                 }
                 if (ref($changes{'curr'}) eq 'HASH') {
                     foreach my $balancer (sort(keys(%{$changes{'curr'}}))) {
+                        $toupdate{$balancer} = 1;
                         if (ref($changes{'curr'}{$balancer}) eq 'HASH') {
                             if ($changes{'curr'}{$balancer}{'targets'}) {
                                 my %offloadstr;
@@ -10844,8 +11039,38 @@ sub modify_loadbalancing {
                                         if ($rule eq '') {
                                             $balancetext =  $ruletitles{'default'};
                                         } elsif (($rule eq 'homeserver') || ($rule eq 'externalbalancer') ||
-                                                 ($rule eq 'balancer') || ($rule eq 'offloadedto')) {
-                                            $balancetext =  $ruletitles{$rule};
+                                                 ($type eq '_LC_ipchange') || ($type eq '_LC_ipchangesso')) { 
+                                            if (($type eq '_LC_ipchange') || ($type eq '_LC_ipchangesso')) {
+                                                foreach my $sparetype (@sparestypes) {
+                                                    if (ref($defaultshash{'loadbalancing'}{$balancer}{'targets'}{$sparetype}) eq 'ARRAY') {
+                                                        map { $toupdate{$_} = 1; } (@{$defaultshash{'loadbalancing'}{$balancer}{'targets'}{$sparetype}});
+                                                    }
+                                                }
+                                                foreach my $item (@{$alltypes}) {
+                                                    next if ($item =~  /^_LC_ipchange/);
+                                                    my $hasrule = $defaultshash{'loadbalancing'}{$balancer}{'rules'}{$item};
+                                                    if ($hasrule eq 'homeserver') {
+                                                        map { $toupdate{$_} = 1; } (keys(%libraryservers));
+                                                    } else {
+                                                        unless (($hasrule eq 'default') || ($hasrule eq 'none') || ($hasrule eq 'externalbalancer')) {
+                                                            if ($servers{$hasrule}) {
+                                                                $toupdate{$hasrule} = 1;
+                                                            }
+                                                        }
+                                                    }
+                                                }
+                                                if (($rule eq 'balancer') || ($rule eq 'offloadedto')) {
+                                                    $balancetext =  $ruletitles{$rule};
+                                                } else {
+                                                    my $receiver = $defaultshash{'loadbalancing'}{$balancer}{'rules'}{$type};
+                                                    $balancetext = $ruletitles{'particular'}.' '.$receiver;
+                                                    if ($receiver) {
+                                                        $toupdate{$receiver};
+                                                    }
+                                                }
+                                            } else {
+                                                $balancetext =  $ruletitles{$rule};
+                                            }
                                         } else {
                                             $balancetext = &mt('offload to [_1]',$defaultshash{'loadbalancing'}{$balancer}{'rules'}{$type});
                                         }
@@ -10854,8 +11079,25 @@ sub modify_loadbalancing {
                                 }
                             }
                         }
-                        my $cachekey = &escape('loadbalancing').':'.&escape($dom);
-                        &Apache::lonnet::remote_devalidate_cache($balancer,[$cachekey]);
+                        if (keys(%toupdate)) {
+                            my %thismachine;
+                            my $updatedhere;
+                            my $cachetime = 60*60*24;
+                            map { $thismachine{$_} = 1; } &Apache::lonnet::current_machine_ids();
+                            foreach my $lonhost (keys(%toupdate)) {
+                                if ($thismachine{$lonhost}) {
+                                    unless ($updatedhere) {
+                                        &Apache::lonnet::do_cache_new('loadbalancing',$dom,
+                                                                      $defaultshash{'loadbalancing'},
+                                                                      $cachetime);
+                                        $updatedhere = 1;
+                                    }
+                                } else {
+                                    my $cachekey = &escape('loadbalancing').':'.&escape($dom);
+                                    &Apache::lonnet::remote_devalidate_cache($lonhost,[$cachekey]);
+                                }
+                            }
+                        }
                     }
                 }
                 if ($resulttext ne '') {