--- loncom/lond	2010/04/12 19:15:57	1.439
+++ loncom/lond	2013/12/13 17:30:30	1.489.2.10
@@ -2,7 +2,7 @@
 # The LearningOnline Network
 # lond "LON Daemon" Server (port "LOND" 5663)
 #
-# $Id: lond,v 1.439 2010/04/12 19:15:57 raeburn Exp $
+# $Id: lond,v 1.489.2.10 2013/12/13 17:30:30 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -15,6 +15,7 @@
 #
 # LON-CAPA is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
+
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
@@ -33,6 +34,7 @@ use strict;
 use lib '/home/httpd/lib/perl/';
 use LONCAPA;
 use LONCAPA::Configuration;
+use LONCAPA::Lond;
 
 use IO::Socket;
 use IO::File;
@@ -52,13 +54,14 @@ use LONCAPA::lonlocal;
 use LONCAPA::lonssl;
 use Fcntl qw(:flock);
 use Apache::lonnet;
+use Mail::Send;
 
 my $DEBUG = 0;		       # Non zero to enable debug log entries.
 
 my $status='';
 my $lastlog='';
 
-my $VERSION='$Revision: 1.439 $'; #' stupid emacs
+my $VERSION='$Revision: 1.489.2.10 $'; #' stupid emacs
 my $remoteVERSION;
 my $currenthostid="default";
 my $currentdomainid;
@@ -66,7 +69,9 @@ my $currentdomainid;
 my $client;
 my $clientip;			# IP address of client.
 my $clientname;			# LonCAPA name of client.
-my $clientversion;              # LonCAPA version running on client
+my $clientversion;              # LonCAPA version running on client.
+my $clienthomedom;              # LonCAPA domain of homeID for client. 
+                                # primary library server. 
 
 my $server;
 
@@ -88,6 +93,8 @@ my %managers;			# Ip -> manager names
 
 my %perlvar;			# Will have the apache conf defined perl vars.
 
+my $dist;
+
 #
 #   The hash below is used for command dispatching, and is therefore keyed on the request keyword.
 #    Each element of the hash contains a reference to an array that contains:
@@ -123,32 +130,13 @@ my @passwderrors = ("ok",
 		   "pwchange_failure - lcpasswd Error filename is invalid");
 
 
-#  The array below are lcuseradd error strings.:
-
-my $lastadderror = 13;
-my @adderrors    = ("ok",
-		    "User ID mismatch, lcuseradd must run as user www",
-		    "lcuseradd Incorrect number of command line parameters must be 3",
-		    "lcuseradd Incorrect number of stdinput lines, must be 3",
-		    "lcuseradd Too many other simultaneous pwd changes in progress",
-		    "lcuseradd User does not exist",
-		    "lcuseradd Unable to make www member of users's group",
-		    "lcuseradd Unable to su to root",
-		    "lcuseradd Unable to set password",
-		    "lcuseradd Username has invalid characters",
-		    "lcuseradd Password has an invalid character",
-		    "lcuseradd User already exists",
-		    "lcuseradd Could not add user.",
-		    "lcuseradd Password mismatch");
-
-
 # This array are the errors from lcinstallfile:
 
 my @installerrors = ("ok",
 		     "Initial user id of client not that of www",
 		     "Usage error, not enough command line arguments",
-		     "Source file name does not exist",
-		     "Destination file name does not exist",
+		     "Source filename does not exist",
+		     "Destination filename does not exist",
 		     "Some file operation failed",
 		     "Invalid table filename."
 		     );
@@ -417,8 +405,11 @@ sub ReadManagerTable {
 
    my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
    if (!open (MANAGERS, $tablename)) {
-      logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
-      return;
+       my $hostname = &Apache::lonnet::hostname($perlvar{'lonHostID'});
+       if (&Apache::lonnet::is_LC_dns($hostname)) {
+           &logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
+       }
+       return;
    }
    while(my $host = <MANAGERS>) {
       chomp($host);
@@ -443,7 +434,7 @@ sub ReadManagerTable {
          }
       } else {
          logthis('<font color="green"> existing host'." $host</font>\n");
-         $managers{&Apache::lonnet::get_host_ip($host)} = $host;  # Use info from cluster tab if clumemeber
+         $managers{&Apache::lonnet::get_host_ip($host)} = $host;  # Use info from cluster tab if cluster memeber
       }
    }
 }
@@ -505,7 +496,8 @@ sub AdjustHostContents {
     my $me        = $perlvar{'lonHostID'};
 
     foreach my $line (split(/\n/,$contents)) {
-	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
+	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/) ||
+             ($line =~ /^\s*\^/))) {
 	    chomp($line);
 	    my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
 	    if ($id eq $me) {
@@ -593,11 +585,8 @@ sub InstallFile {
 #
 #   ConfigFileFromSelector: converts a configuration file selector
 #                 into a configuration file pathname.
-#                 It's probably no longer necessary to preserve
-#                 special handling of hosts or domain as those
-#                 files have been superceded by dns_hosts, dns_domain.
-#                 The default action is just to prepend the directory
-#                 and append .tab
+#                 Supports the following file selectors: 
+#                 hosts, domain, dns_hosts, dns_domain  
 #
 #
 #  Parameters:
@@ -610,15 +599,11 @@ sub ConfigFileFromSelector {
     my $tablefile;
 
     my $tabledir = $perlvar{'lonTabDir'}.'/';
-    if ($selector eq "hosts") {
-	$tablefile = $tabledir."hosts.tab";
-    } elsif ($selector eq "domain") {
-	$tablefile = $tabledir."domain.tab";
-    } else {
+    if (($selector eq "hosts") || ($selector eq "domain") || 
+        ($selector eq "dns_hosts") || ($selector eq "dns_domain")) {
 	$tablefile =  $tabledir.$selector.'.tab';
     }
     return $tablefile;
-
 }
 #
 #   PushFile:  Called to do an administrative push of a file.
@@ -644,6 +629,8 @@ sub PushFile {
     #  supported:
     #   hosts.tab  ($filename eq host).
     #   domain.tab ($filename eq domain).
+    #   dns_hosts.tab ($filename eq dns_host).
+    #   dns_domain.tab ($filename eq dns_domain). 
     # Construct the destination filename or reject the request.
     #
     # lonManage is supposed to ensure this, however this session could be
@@ -675,11 +662,31 @@ sub PushFile {
 	return "error:$!";
     } else {
 	&logthis('<font color="green"> Installed new '.$tablefile
-		 ."</font>");
-
+		 ." - transaction by: $clientname ($clientip)</font>");
+        my $adminmail = $perlvar{'lonAdmEMail'};
+        my $admindom = &Apache::lonnet::host_domain($perlvar{'lonHostID'});
+        if ($admindom ne '') {
+            my %domconfig =
+                &Apache::lonnet::get_dom('configuration',['contacts'],$admindom);
+            if (ref($domconfig{'contacts'}) eq 'HASH') {
+                if ($domconfig{'contacts'}{'adminemail'} ne '') {
+                    $adminmail = $domconfig{'contacts'}{'adminemail'};
+                }
+            }
+        }
+        if ($adminmail =~ /^[^\@]+\@[^\@]+$/) {
+            my $msg = new Mail::Send;
+            $msg->to($adminmail);
+            $msg->subject('LON-CAPA DNS update on '.$perlvar{'lonHostID'});
+            $msg->add('Content-type','text/plain; charset=UTF-8');
+            if (my $fh = $msg->open()) {
+                print $fh 'Update to '.$tablefile.' from Cluster Manager '.
+                          "$clientname ($clientip)\n";
+                $fh->close;
+            }
+        }
     }
 
-
     #  Indicate success:
  
     return "ok";
@@ -975,6 +982,9 @@ sub read_profile {
 				 &GDBM_READER());
     if ($hashref) {
         my @queries=split(/\&/,$what);
+        if ($namespace eq 'roles') {
+            @queries = map { &unescape($_); } @queries; 
+        }
         my $qresult='';
 	
 	for (my $i=0;$i<=$#queries;$i++) {
@@ -1068,7 +1078,7 @@ sub pong_handler {
 #  Implicit Inputs:
 #      $currenthostid - Global variable that carries the name of the host
 #                       known as.
-#      $clientname    - Global variable that carries the name of the hsot we're connected to.
+#      $clientname    - Global variable that carries the name of the host we're connected to.
 #  Returns:
 #      1       - Ok to continue processing.
 #      0       - Program should exit.
@@ -1107,7 +1117,7 @@ sub establish_key_handler {
 #  Implicit Inputs:
 #      $currenthostid - Global variable that carries the name of the host
 #                       known as.
-#      $clientname    - Global variable that carries the name of the hsot we're connected to.
+#      $clientname    - Global variable that carries the name of the host we're connected to.
 #  Returns:
 #      1       - Ok to continue processing.
 #      0       - Program should exit.
@@ -1116,6 +1126,8 @@ sub establish_key_handler {
 sub load_handler {
     my ($cmd, $tail, $replyfd) = @_;
 
+
+
    # Get the load average from /proc/loadavg and calculate it as a percentage of
    # the allowed load limit as set by the perl global variable lonLoadLim
 
@@ -1144,7 +1156,7 @@ sub load_handler {
 #  Implicit Inputs:
 #      $currenthostid - Global variable that carries the name of the host
 #                       known as.
-#      $clientname    - Global variable that carries the name of the hsot we're connected to.
+#      $clientname    - Global variable that carries the name of the host we're connected to.
 #  Returns:
 #      1       - Ok to continue processing.
 #      0       - Program should exit
@@ -1613,6 +1625,80 @@ sub ls3_handler {
 }
 &register_handler("ls3", \&ls3_handler, 0, 1, 0);
 
+sub read_lonnet_global {
+    my ($cmd,$tail,$client) = @_;
+    my $userinput = "$cmd:$tail";
+    my $requested = &Apache::lonnet::thaw_unescape($tail);
+    my $result;
+    my %packagevars = (
+                        spareid => \%Apache::lonnet::spareid,
+                        perlvar => \%Apache::lonnet::perlvar,
+                      );
+    my %limit_to = (
+                    perlvar => {
+                                 lonOtherAuthen => 1,
+                                 lonBalancer    => 1,
+                                 lonVersion     => 1,
+                                 lonSysEMail    => 1,
+                                 lonHostID      => 1,
+                                 lonRole        => 1,
+                                 lonDefDomain   => 1,
+                                 lonLoadLim     => 1,
+                                 lonUserLoadLim => 1,
+                               }
+                  );
+    if (ref($requested) eq 'HASH') {
+        foreach my $what (keys(%{$requested})) {
+            my $response;
+            my $items = {};
+            if (exists($packagevars{$what})) {
+                if (ref($limit_to{$what}) eq 'HASH') {
+                    foreach my $varname (keys(%{$packagevars{$what}})) {
+                        if ($limit_to{$what}{$varname}) {
+                            $items->{$varname} = $packagevars{$what}{$varname};
+                        }
+                    }
+                } else {
+                    $items = $packagevars{$what};
+                }
+                if ($what eq 'perlvar') {
+                    if (!exists($packagevars{$what}{'lonBalancer'})) {
+                        if ($dist =~ /^(centos|rhes|fedora|scientific)/) {
+                            my $othervarref=LONCAPA::Configuration::read_conf('httpd.conf');
+                            if (ref($othervarref) eq 'HASH') {
+                                $items->{'lonBalancer'} = $othervarref->{'lonBalancer'};
+                            }
+                        }
+                    }
+                }
+                $response = &Apache::lonnet::freeze_escape($items);
+            }
+            $result .= &escape($what).'='.$response.'&';
+        }
+    }
+    $result =~ s/\&$//;
+    &Reply($client,\$result,$userinput);
+    return 1;
+}
+&register_handler("readlonnetglobal", \&read_lonnet_global, 0, 1, 0);
+
+sub server_devalidatecache_handler {
+    my ($cmd,$tail,$client) = @_;
+    my $userinput = "$cmd:$tail";
+    my $items = &unescape($tail);
+    my @cached = split(/\&/,$items);
+    foreach my $key (@cached) {
+        if ($key =~ /:/) {
+            my ($name,$id) = map { &unescape($_); } split(/:/,$key);
+            &Apache::lonnet::devalidate_cache_new($name,$id);
+        }
+    }
+    my $result = 'ok';
+    &Reply($client,\$result,$userinput);
+    return 1;
+}
+&register_handler("devalidatecache", \&server_devalidatecache_handler, 0, 1, 0);
+
 sub server_timezone_handler {
     my ($cmd,$tail,$client) = @_;
     my $userinput = "$cmd:$tail";
@@ -1653,6 +1739,23 @@ sub server_loncaparev_handler {
 }
 &register_handler("serverloncaparev", \&server_loncaparev_handler, 0, 1, 0);
 
+sub server_homeID_handler {
+    my ($cmd,$tail,$client) = @_;
+    my $userinput = "$cmd:$tail";
+    &Reply($client,\$perlvar{'lonHostID'},$userinput);
+    return 1;
+}
+&register_handler("serverhomeID", \&server_homeID_handler, 0, 1, 0);
+
+sub server_distarch_handler {
+    my ($cmd,$tail,$client) = @_;
+    my $userinput = "$cmd:$tail";
+    my $reply = &distro_and_arch();
+    &Reply($client,\$reply,$userinput);
+    return 1;
+}
+&register_handler("serverdistarch", \&server_distarch_handler, 0, 1, 0);
+
 #   Process a reinit request.  Reinit requests that either
 #   lonc or lond be reinitialized so that an updated 
 #   host.tab or domain.tab can be processed.
@@ -1762,15 +1865,49 @@ sub authenticate_handler {
     #  upass   - User's password.
     #  checkdefauth - Pass to validate_user() to try authentication
     #                 with default auth type(s) if no user account.
+    #  clientcancheckhost - Passed by clients with functionality in lonauth.pm
+    #                       to check if session can be hosted.
     
-    my ($udom, $uname, $upass, $checkdefauth)=split(/:/,$tail);
+    my ($udom, $uname, $upass, $checkdefauth, $clientcancheckhost)=split(/:/,$tail);
     &Debug(" Authenticate domain = $udom, user = $uname, password = $upass,  checkdefauth = $checkdefauth");
     chomp($upass);
     $upass=&unescape($upass);
 
     my $pwdcorrect = &validate_user($udom,$uname,$upass,$checkdefauth);
     if($pwdcorrect) {
-	&Reply( $client, "authorized\n", $userinput);
+        my $canhost = 1;
+        unless ($clientcancheckhost) {
+            my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
+            my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
+            my @intdoms;
+            my $internet_names = &Apache::lonnet::get_internet_names($clientname);
+            if (ref($internet_names) eq 'ARRAY') {
+                @intdoms = @{$internet_names};
+            }
+            unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
+                my ($remote,$hosted);
+                my $remotesession = &get_usersession_config($udom,'remotesession');
+                if (ref($remotesession) eq 'HASH') {
+                    $remote = $remotesession->{'remote'}
+                }
+                my $hostedsession = &get_usersession_config($clienthomedom,'hostedsession');
+                if (ref($hostedsession) eq 'HASH') {
+                    $hosted = $hostedsession->{'hosted'};
+                }
+                my $loncaparev = $clientversion;
+                if ($loncaparev eq '') {
+                    $loncaparev = $Apache::lonnet::loncaparevs{$clientname};
+                }
+                $canhost = &Apache::lonnet::can_host_session($udom,$clientname,
+                                                             $loncaparev,
+                                                             $remote,$hosted);
+            }
+        }
+        if ($canhost) {               
+            &Reply( $client, "authorized\n", $userinput);
+        } else {
+            &Reply( $client, "not_allowed_to_host\n", $userinput);
+        }
 	#
 	#  Bad credentials: Failed to authorize
 	#
@@ -1924,7 +2061,7 @@ sub add_user_handler {
 		    ."makeuser";
 	    }
 	    unless ($fperror) {
-		my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
+		my $result=&make_passwd_file($uname,$udom,$umode,$npass, $passfilename);
 		&Reply($client,\$result, $userinput);     #BUGBUG - could be fail
 	    } else {
 		&Failure($client, \$fperror, $userinput);
@@ -1985,10 +2122,9 @@ sub change_authentication_handler {
 	my $passfilename = &password_path($udom, $uname);
 	if ($passfilename) {	# Not allowed to create a new user!!
 	    # If just changing the unix passwd. need to arrange to run
-	    # passwd since otherwise make_passwd_file will run
-	    # lcuseradd which fails if an account already exists
-	    # (to prevent an unscrupulous LONCAPA admin from stealing
-	    # an existing account by overwriting it as a LonCAPA account).
+	    # passwd since otherwise make_passwd_file will fail as 
+	    # creation of unix authenticated users is no longer supported
+            # except from the command line, when running make_domain_coordinator.pl
 
 	    if(($oldauth =~/^unix/) && ($umode eq "unix")) {
 		my $result = &change_unix_password($uname, $npass);
@@ -1999,22 +2135,15 @@ sub change_authentication_handler {
 		    &Failure($client, \$result);
 		}
 	    } else {
-		my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
+		my $result=&make_passwd_file($uname,$udom,$umode,$npass,$passfilename);
 		#
 		#  If the current auth mode is internal, and the old auth mode was
 		#  unix, or krb*,  and the user is an author for this domain,
 		#  re-run manage_permissions for that role in order to be able
 		#  to take ownership of the construction space back to www:www
 		#
-		
-		
-		if( (($oldauth =~ /^unix/) && ($umode eq "internal")) ||
-		    (($oldauth =~ /^internal/) && ($umode eq "unix")) ) { 
-		    if(&is_author($udom, $uname)) {
-			&Debug(" Need to manage author permissions...");
-			&manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
-		    }
-		}
+
+
 		&Reply($client, \$result, $userinput);
 	    }
 	       
@@ -2108,7 +2237,10 @@ sub update_resource_handler {
 		my $transname="$fname.in.transfer";
 		my $remoteurl=&Apache::lonnet::reply("sub:$fname","$clientname");
 		my $response;
-		alarm(120);
+# FIXME: cannot replicate files that take more than two minutes to transfer?
+#		alarm(120);
+# FIXME: this should use the LWP mechanism, not internal alarms.
+                alarm(1200);
 		{
 		    my $ua=new LWP::UserAgent;
 		    my $request=new HTTP::Request('GET',"$remoteurl");
@@ -2116,11 +2248,13 @@ sub update_resource_handler {
 		}
 		alarm(0);
 		if ($response->is_error()) {
+# FIXME: we should probably clean up here instead of just whine
 		    unlink($transname);
 		    my $message=$response->status_line;
 		    &logthis("LWP GET: $message for $fname ($remoteurl)");
 		} else {
 		    if ($remoteurl!~/\.meta$/) {
+# FIXME: isn't there an internal LWP mechanism for this?
 			alarm(120);
 			{
 			    my $ua=new LWP::UserAgent;
@@ -2194,7 +2328,10 @@ sub fetch_user_file_handler {
 
 	my $destname=$udir.'/'.$ufile;
 	my $transname=$udir.'/'.$ufile.'.in.transit';
-	my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
+        my $clientprotocol=$Apache::lonnet::protocol{$clientname};
+        $clientprotocol = 'http' if ($clientprotocol ne 'https');
+	my $clienthost = &Apache::lonnet::hostname($clientname);
+	my $remoteurl=$clientprotocol.'://'.$clienthost.'/userfiles/'.$fname;
 	my $response;
 	Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
 	alarm(120);
@@ -2216,6 +2353,24 @@ sub fetch_user_file_handler {
 		unlink($transname);
 		&Failure($client, "failed\n", $userinput);
 	    } else {
+                if ($fname =~ /^default.+\.(page|sequence)$/) {
+                    my ($major,$minor) = split(/\./,$clientversion);
+                    if (($major < 2) || ($major == 2 && $minor < 11)) {
+                        my $now = time;
+                        &Apache::lonnet::do_cache_new('crschange',$udom.'_'.$uname,$now,600);
+                        my $key = &escape('internal.contentchange');
+                        my $what = "$key=$now";
+                        my $hashref = &tie_user_hash($udom,$uname,'environment',
+                                                     &GDBM_WRCREAT(),"P",$what);
+                        if ($hashref) {
+                            $hashref->{$key}=$now;
+                            if (!&untie_user_hash($hashref)) {
+                                &logthis("error: ".($!+0)." untie (GDBM) failed ".
+                                         "when updating internal.contentchange");
+                            }
+                        }
+                    }
+                }
 		&Reply($client, "ok\n", $userinput);
 	    }
 	}   
@@ -2370,7 +2525,6 @@ sub user_has_session_handler {
 
     my ($udom, $uname) = map { &unescape($_) } (split(/:/, $tail));
     
-    &logthis("Looking for $udom $uname");
     opendir(DIR,$perlvar{'lonIDsDir'});
     my $filename;
     while ($filename=readdir(DIR)) {
@@ -3089,6 +3243,9 @@ sub dump_profile_database {
 #                                             that is matched against
 #                                             database keywords to do
 #                                             selective dumps.
+#                               range       - optional range of entries
+#                                             e.g., 10-20 would return the
+#                                             10th to 19th items, etc.  
 #   $client                   - Channel open on the client.
 # Returns:
 #    1    - Continue processing.
@@ -3098,65 +3255,12 @@ sub dump_profile_database {
 sub dump_with_regexp {
     my ($cmd, $tail, $client) = @_;
 
+    my $res = LONCAPA::Lond::dump_with_regexp($tail, $clientversion);
 
-    my $userinput = "$cmd:$tail";
-
-    my ($udom,$uname,$namespace,$regexp,$range)=split(/:/,$tail);
-    if (defined($regexp)) {
-	$regexp=&unescape($regexp);
-    } else {
-	$regexp='.';
-    }
-    my ($start,$end);
-    if (defined($range)) {
-	if ($range =~/^(\d+)\-(\d+)$/) {
-	    ($start,$end) = ($1,$2);
-	} elsif ($range =~/^(\d+)$/) {
-	    ($start,$end) = (0,$1);
-	} else {
-	    undef($range);
-	}
-    }
-    my $hashref = &tie_user_hash($udom, $uname, $namespace,
-				 &GDBM_READER());
-    if ($hashref) {
-        my $qresult='';
-	my $count=0;
-	while (my ($key,$value) = each(%$hashref)) {
-            if ($namespace eq 'roles') {
-                if ($key =~ /^($LONCAPA::match_domain)_($LONCAPA::match_community)_(cc|co|in|ta|ep|ad|st|cr)/) {
-                    if ($clientversion =~ /^(\d+)\.(\d+)$/) {
-                        my $major = $1;
-                        my $minor = $2;
-                        next if (($major < 2) || (($major == 2) && ($minor < 9)));
-                    }
-                }
-            }
-	    if ($regexp eq '.') {
-		$count++;
-		if (defined($range) && $count >= $end)   { last; }
-		if (defined($range) && $count <  $start) { next; }
-		$qresult.=$key.'='.$value.'&';
-	    } else {
-		my $unescapeKey = &unescape($key);
-		if (eval('$unescapeKey=~/$regexp/')) {
-		    $count++;
-		    if (defined($range) && $count >= $end)   { last; }
-		    if (defined($range) && $count <  $start) { next; }
-		    $qresult.="$key=$value&";
-		}
-	    }
-	}
-	if (&untie_user_hash($hashref)) {
-	    chop($qresult);
-	    &Reply($client, \$qresult, $userinput);
-	} else {
-	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
-		     "while attempting dump\n", $userinput);
-	}
+    if ($res =~ /^error:/) {
+        &Failure($client, \$res, "$cmd:$tail");
     } else {
-	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
-		"while attempting dump\n", $userinput);
+        &Reply($client, \$res, "$cmd:$tail");
     }
 
     return 1;
@@ -3725,6 +3829,9 @@ sub put_course_id_hash_handler {
 #                 createdafter - include courses for which creation date followed this date.
 #                 creationcontext - include courses created in specified context 
 #
+#                 domcloner - flag to indicate if user can create CCs in course's domain.
+#                             If so, ability to clone course is automatic. 
+#
 #     $client  - The socket open on the client.
 # Returns:
 #    1     - Continue processing.
@@ -3737,7 +3844,7 @@ sub dump_course_id_handler {
     my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter,
         $typefilter,$regexp_ok,$rtn_as_hash,$selfenrollonly,$catfilter,$showhidden,
         $caller,$cloner,$cc_clone_list,$cloneonly,$createdbefore,$createdafter,
-        $creationcontext) =split(/:/,$tail);
+        $creationcontext,$domcloner) =split(/:/,$tail);
     my $now = time;
     my ($cloneruname,$clonerudom,%cc_clone);
     if (defined($description)) {
@@ -3810,9 +3917,8 @@ sub dump_course_id_handler {
     } else {
         $creationcontext = '.';
     }
-    
     my $unpack = 1;
-    if ($description eq '.' && $instcodefilter eq '.' && $coursefilter eq '.' && 
+    if ($description eq '.' && $instcodefilter eq '.' && $ownerfilter eq '.' && 
         $typefilter eq '.') {
         $unpack = 0;
     }
@@ -3841,7 +3947,9 @@ sub dump_course_id_handler {
                     next if ($since > 1);
                 }
                 $is_hash =  1;
-                if (defined($clonerudom)) {
+                if ($domcloner) {
+                    $canclone = 1;
+                } elsif (defined($clonerudom)) {
                     if ($items->{'cloners'}) {
                         my @cloneable = split(',',$items->{'cloners'});
                         if (@cloneable) {
@@ -3874,7 +3982,7 @@ sub dump_course_id_handler {
                                 if ($items->{'owner'} eq $cloner) {
                                     $canclone = 1;
                                 }
-                            } elsif ($cloner eq $udom.':'.$items->{'owner'}) {
+                            } elsif ($cloner eq $items->{'owner'}.':'.$udom) {
                                 $canclone = 1;
                             }
                             if ($canclone) {
@@ -4194,6 +4302,7 @@ sub put_domain_handler {
 sub get_domain_handler {
     my ($cmd, $tail, $client) = @_;
 
+
     my $userinput = "$client:$tail";
 
     my ($udom,$namespace,$what)=split(/:/,$tail,3);
@@ -4318,6 +4427,49 @@ sub get_id_handler {
 }
 &register_handler("idget", \&get_id_handler, 0, 1, 0);
 
+#   Deletes one or more ids in a domain's id database.
+#
+#   Parameters:
+#       $cmd                  - Command keyword (iddel).
+#       $tail                 - Command tail.  In this case a colon
+#                               separated list containing:
+#                               The domain for which we are deleting the id(s).
+#                               &-separated list of id(s) to delete.
+#       $client               - File open on client socket.
+# Returns:
+#     1   - Continue processing
+#     0   - Exit server.
+#
+#
+
+sub del_id_handler {
+    my ($cmd,$tail,$client) = @_;
+
+    my $userinput = "$cmd:$tail";
+
+    my ($udom,$what)=split(/:/,$tail);
+    chomp($what);
+    my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
+                                   "D", $what);
+    if ($hashref) {
+        my @keys=split(/\&/,$what);
+        foreach my $key (@keys) {
+            delete($hashref->{$key});
+        }
+        if (&untie_user_hash($hashref)) {
+            &Reply($client, "ok\n", $userinput);
+        } else {
+            &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                    "while attempting iddel\n", $userinput);
+        }
+    } else {
+        &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+                 "while attempting iddel\n", $userinput);
+    }
+    return 1;
+}
+&register_handler("iddel", \&del_id_handler, 0, 1, 0);
+
 #
 # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database 
 #
@@ -4338,7 +4490,8 @@ sub get_id_handler {
 sub put_dcmail_handler {
     my ($cmd,$tail,$client) = @_;
     my $userinput = "$cmd:$tail";
-                                                                                
+
+
     my ($udom,$what)=split(/:/,$tail);
     chomp($what);
     my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
@@ -4602,7 +4755,7 @@ sub tmp_put_handler {
     }
     my ($id,$store);
     $tmpsnum++;
-    if ($context eq 'resetpw') {
+    if (($context eq 'resetpw') || ($context eq 'createaccount')) {
         $id = &md5_hex(&md5_hex(time.{}.rand().$$));
     } else {
         $id = $$.'_'.$clientip.'_'.$tmpsnum;
@@ -4865,9 +5018,10 @@ sub validate_instcode_handler {
     my ($dom,$instcode,$owner) = split(/:/, $tail);
     $instcode = &unescape($instcode);
     $owner = &unescape($owner);
-    my ($outcome,$description) = 
+    my ($outcome,$description,$credits) = 
         &localenroll::validate_instcode($dom,$instcode,$owner);
-    my $result = &escape($outcome).'&'.&escape($description);
+    my $result = &escape($outcome).'&'.&escape($description).'&'.
+                 &escape($credits);
     &Reply($client, \$result, $userinput);
 
     return 1;
@@ -4920,10 +5074,11 @@ sub get_sections_handler {
 sub validate_course_owner_handler {
     my ($cmd, $tail, $client)  = @_;
     my $userinput = "$cmd:$tail";
-    my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
-
+    my ($inst_course_id, $owner, $cdom, $coowners) = split(/:/, $tail);
+    
     $owner = &unescape($owner);
-    my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
+    $coowners = &unescape($coowners);
+    my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom,$coowners);
     &Reply($client, \$outcome, $userinput);
 
 
@@ -5839,18 +5994,6 @@ sub lcpasswdstrerror {
     }
 }
 
-#
-# Convert an error return code from lcuseradd to a string value:
-#
-sub lcuseraddstrerror {
-    my $ErrorCode = shift;
-    if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
-	return "lcuseradd - Unrecognized error code: ".$ErrorCode;
-    } else {
-	return $adderrors[$ErrorCode];
-    }
-}
-
 # grabs exception and records it to log before exiting
 sub catchexception {
     my ($error)=@_;
@@ -5911,7 +6054,7 @@ if (-e $pidfile) {
 $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
                                 Type      => SOCK_STREAM,
                                 Proto     => 'tcp',
-                                Reuse     => 1,
+                                ReuseAddr     => 1,
                                 Listen    => 10 )
   or die "making socket: $@\n";
 
@@ -5974,9 +6117,13 @@ sub HUPSMAN {                      # sig
 #  a setuid perl script that can be root for us to do this job.
 #
 sub ReloadApache {
-    my $execdir = $perlvar{'lonDaemons'};
-    my $script  = $execdir."/apachereload";
-    system($script);
+# --------------------------- Handle case of another apachereload process (locking)
+    if (&LONCAPA::try_to_lock('/tmp/lock_apachereload')) {
+        my $execdir = $perlvar{'lonDaemons'};
+        my $script  = $execdir."/apachereload";
+        system($script);
+        unlink('/tmp/lock_apachereload'); #  Remove the lock file.
+    }
 }
 
 #
@@ -6149,7 +6296,7 @@ sub logstatus {
 sub initnewstatus {
     my $docdir=$perlvar{'lonDocRoot'};
     my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
-    my $now=time;
+    my $now=time();
     my $local=localtime($now);
     print $fh "LOND status $local - parent $$\n\n";
     opendir(DIR,"$docdir/lon-status/londchld");
@@ -6238,8 +6385,16 @@ $SIG{USR2} = \&UpdateHosts;
 
 #  Read the host hashes:
 &Apache::lonnet::load_hosts_tab();
+my %iphost = &Apache::lonnet::get_iphost(1);
+
+$dist=`$perlvar{'lonDaemons'}/distprobe`;
 
-my $dist=`$perlvar{'lonDaemons'}/distprobe`;
+my $arch = `uname -i`;
+chomp($arch);
+if ($arch eq 'unknown') {
+    $arch = `uname -m`;
+    chomp($arch);
+}
 
 # --------------------------------------------------------------
 #   Accept connections.  When a connection comes in, it is validated
@@ -6298,6 +6453,7 @@ sub make_new_child {
             or die "Can't unblock SIGINT for fork: $!\n";
         $children{$pid} = $clientip;
         &status('Started child '.$pid);
+	close($client);
         return;
     } else {
         # Child can *not* return from this subroutine.
@@ -6306,6 +6462,13 @@ sub make_new_child {
                                 #don't get intercepted
         $SIG{USR1}= \&logstatus;
         $SIG{ALRM}= \&timeout;
+	#
+	# Block sigpipe as it gets thrownon socket disconnect and we want to 
+	# deal with that as a read faiure instead.
+	#
+	my $blockset = POSIX::SigSet->new(SIGPIPE);
+	sigprocmask(SIG_BLOCK, $blockset);
+
         $lastlog='Forked ';
         $status='Forked';
 
@@ -6317,7 +6480,9 @@ sub make_new_child {
 #---------------------------------------------------- kerberos 5 initialization
         &Authen::Krb5::init_context();
 	unless (($dist eq 'fedora5') || ($dist eq 'fedora4') ||  
-		($dist eq 'fedora6') || ($dist eq 'suse9.3')) {
+		($dist eq 'fedora6') || ($dist eq 'suse9.3') ||
+                ($dist eq 'suse12.2') || ($dist eq 'suse12.3') ||
+                ($dist eq 'suse13.1')) {
 	    &Authen::Krb5::init_ets();
 	}
 
@@ -6363,6 +6528,12 @@ sub make_new_child {
 		#  If the remote is attempting a local init... give that a try:
 		#
 		(my $i, my $inittype, $clientversion) = split(/:/, $remotereq);
+                # For LON-CAPA 2.9, the  client session will have sent its LON-CAPA
+                # version when initiating the connection. For LON-CAPA 2.8 and older,
+                # the version is retrieved from the global %loncaparevs in lonnet.pm.
+                # $clientversion contains path to keyfile if $inittype eq 'local'
+                # it's overridden below in this case
+                $clientversion ||= $Apache::lonnet::loncaparevs{$clientname};
 
 		# If the connection type is ssl, but I didn't get my
 		# certificate files yet, then I'll drop  back to 
@@ -6390,7 +6561,7 @@ sub make_new_child {
 			my $cipherkey = pack("H32", $key);
 			$cipher       = new IDEA($cipherkey);
 			print $client "ok:local\n";
-			&logthis('<font color="green"'
+			&logthis('<font color="green">'
 				 . "Successful local authentication </font>");
 			$keymode = "local"
 		    } else {
@@ -6454,6 +6625,9 @@ sub make_new_child {
 # ------------------------------------------------------------ Process requests
 	    my $keep_going = 1;
 	    my $user_input;
+            my $clienthost = &Apache::lonnet::hostname($clientname);
+            my $clientserverhomeID = &Apache::lonnet::get_server_homeID($clienthost);
+            $clienthomedom = &Apache::lonnet::host_domain($clientserverhomeID);
 	    while(($user_input = get_request) && $keep_going) {
 		alarm(120);
 		Debug("Main: Got $user_input\n");
@@ -6503,22 +6677,29 @@ sub is_author {
 
     #  Author role should show up as a key /domain/_au
 
-    my $key    = "/$domain/_au";
     my $value;
-    if (defined($hashref)) {
-	$value = $hashref->{$key};
-    }
+    if ($hashref) {
 
-    if(defined($value)) {
-	&Debug("$user @ $domain is an author");
+	my $key    = "/$domain/_au";
+	if (defined($hashref)) {
+	    $value = $hashref->{$key};
+	    if(!untie_user_hash($hashref)) {
+		return 'error: ' .  ($!+0)." untie (GDBM) Failed";
+	    }
+	}
+	
+	if(defined($value)) {
+	    &Debug("$user @ $domain is an author");
+	}
+    } else {
+	return 'error: '.($!+0)." tie (GDBM) Failed";
     }
 
     return defined($value);
 }
 #
 #   Checks to see if the input roleput request was to set
-# an author role.  If so, invokes the lchtmldir script to set
-# up a correct public_html 
+# an author role.  If so, creates construction space 
 # Parameters:
 #    request   - The request sent to the rolesput subchunk.
 #                We're looking for  /domain/_au
@@ -6528,16 +6709,15 @@ sub is_author {
 #
 sub manage_permissions {
     my ($request, $domain, $user, $authtype) = @_;
-
-    &Debug("manage_permissions: $request $domain $user $authtype");
-
     # See if the request is of the form /$domain/_au
     if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput...
-	my $execdir = $perlvar{'lonDaemons'};
-	my $userhome= "/home/$user" ;
-	&logthis("system $execdir/lchtmldir $userhome $user $authtype");
-	&Debug("Setting homedir permissions for $userhome");
-	system("$execdir/lchtmldir $userhome $user $authtype");
+        my $path=$perlvar{'lonDocRoot'}."/priv/$domain";
+        unless (-e $path) {        
+           mkdir($path);
+        }
+        unless (-e $path.'/'.$user) {
+           mkdir($path.'/'.$user);
+        }
     }
 }
 
@@ -7026,7 +7206,9 @@ sub subscribe {
                 # the metadata
 		unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
 		$fname=~s/\/home\/httpd\/html\/res/raw/;
-		$fname="http://".&Apache::lonnet::hostname($perlvar{'lonHostID'})."/".$fname;
+                my $protocol = $Apache::lonnet::protocol{$perlvar{'lonHostID'}};
+                $protocol = 'http' if ($protocol ne 'https');
+		$fname=$protocol.'://'.&Apache::lonnet::hostname($perlvar{'lonHostID'})."/".$fname;
 		$result="$fname\n";
 	    }
 	} else {
@@ -7068,7 +7250,7 @@ sub change_unix_password {
 
 
 sub make_passwd_file {
-    my ($uname, $umode,$npass,$passfilename)=@_;
+    my ($uname,$udom,$umode,$npass,$passfilename)=@_;
     my $result="ok";
     if ($umode eq 'krb4' or $umode eq 'krb5') {
 	{
@@ -7102,55 +7284,8 @@ sub make_passwd_file {
 	    }
 	}
     } elsif ($umode eq 'unix') {
-	{
-	    #
-	    #  Don't allow the creation of privileged accounts!!! that would
-	    #  be real bad!!!
-	    #
-	    my $uid = getpwnam($uname);
-	    if((defined $uid) && ($uid == 0)) {
-		&logthis(">>>Attempted to create privilged account blocked");
-		return "no_priv_account_error\n";
-	    }
-
-	    my $execpath       ="$perlvar{'lonDaemons'}/"."lcuseradd";
-
-	    my $lc_error_file  = $execdir."/tmp/lcuseradd".$$.".status";
-	    {
-		&Debug("Executing external: ".$execpath);
-		&Debug("user  = ".$uname.", Password =". $npass);
-		my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
-		print $se "$uname\n";
-		print $se "$npass\n";
-		print $se "$npass\n";
-		print $se "$lc_error_file\n"; # Status -> unique file.
-	    }
-	    if (-r $lc_error_file) {
-		&Debug("Opening error file: $lc_error_file");
-		my $error = IO::File->new("< $lc_error_file");
-		my $useraddok = <$error>;
-		$error->close;
-		unlink($lc_error_file);
-		
-		chomp $useraddok;
-	
-		if($useraddok > 0) {
-		    my $error_text = &lcuseraddstrerror($useraddok);
-		    &logthis("Failed lcuseradd: $error_text");
-		    $result = "lcuseradd_failed:$error_text";
-		}  else {
-		    my $pf = IO::File->new(">$passfilename");
-		    if($pf) {
-			print $pf "unix:\n";
-		    } else {
-			$result = "pass_file_failed_error";
-		    }
-		}
-	    }  else {
-		&Debug("Could not locate lcuseradd error: $lc_error_file");
-		$result="bug_lcuseradd_no_output_file";
-	    }
-	}
+	&logthis(">>>Attempt to create unix account blocked -- unix auth not available for new users.");
+	$result="no_new_unix_accounts";
     } elsif ($umode eq 'none') {
 	{
 	    my $pf = IO::File->new("> $passfilename");
@@ -7184,7 +7319,7 @@ sub sethost {
 	eq &Apache::lonnet::get_host_ip($hostid)) {
 	$currenthostid  =$hostid;
 	$currentdomainid=&Apache::lonnet::host_domain($hostid);
-	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
+#	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
     } else {
 	&logthis("Requested host id $hostid not an alias of ".
 		 $perlvar{'lonHostID'}." refusing connection");
@@ -7199,6 +7334,25 @@ sub version {
     return "version:$VERSION";
 }
 
+sub get_usersession_config {
+    my ($dom,$name) = @_;
+    my ($usersessionconf,$cached)=&Apache::lonnet::is_cached_new($name,$dom);
+    if (defined($cached)) {
+        return $usersessionconf;
+    } else {
+        my %domconfig = &Apache::lonnet::get_dom('configuration',['usersessions'],$dom);
+        if (ref($domconfig{'usersessions'}) eq 'HASH') {
+            &Apache::lonnet::do_cache_new($name,$dom,$domconfig{'usersessions'},3600);
+            return $domconfig{'usersessions'};
+        }
+    }
+    return;
+}
+
+
+sub distro_and_arch {
+    return $dist.':'.$arch;
+}
 
 # ----------------------------------- POD (plain old documentation, CPAN style)
 
@@ -7407,7 +7561,7 @@ Place in B<logs/lond.log>
 
 stores hash in namespace
 
-=item rolesputy
+=item rolesput
 
 put a role into a user's environment
 
@@ -7934,5 +8088,7 @@ string.
 
 =back
 
+=back
+
 
 =cut