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Diff for /loncom/lond between versions 1.356 and 1.370

version 1.356, 2007/01/15 01:08:28 version 1.370, 2007/04/04 00:03:40
Line 33  use strict; Line 33  use strict;
 use lib '/home/httpd/lib/perl/';  use lib '/home/httpd/lib/perl/';
 use LONCAPA;  use LONCAPA;
 use LONCAPA::Configuration;  use LONCAPA::Configuration;
   use Apache::lonnet;
   
 use IO::Socket;  use IO::Socket;
 use IO::File;  use IO::File;
Line 44  use Digest::MD5 qw(md5_hex); Line 45  use Digest::MD5 qw(md5_hex);
 use GDBM_File;  use GDBM_File;
 use Authen::Krb4;  use Authen::Krb4;
 use Authen::Krb5;  use Authen::Krb5;
 use lib '/home/httpd/lib/perl/';  
 use localauth;  use localauth;
 use localenroll;  use localenroll;
 use localstudentphoto;  use localstudentphoto;
 use File::Copy;  use File::Copy;
 use File::Find;  use File::Find;
 use LONCAPA::ConfigFileEdit;  
 use LONCAPA::lonlocal;  use LONCAPA::lonlocal;
 use LONCAPA::lonssl;  use LONCAPA::lonssl;
 use Fcntl qw(:flock);  use Fcntl qw(:flock);
Line 86  my $tmpsnum = 0;  # Id of tmpputs. Line 85  my $tmpsnum = 0;  # Id of tmpputs.
   
 my $ConnectionType;  my $ConnectionType;
   
 my %hostid; # ID's for hosts in cluster by ip.  
 my %hostdom; # LonCAPA domain for hosts in cluster.  
 my %hostname; # DNSname -> ID's mapping.  
 my %hostip; # IPs for hosts in cluster.  
 my %hostdns; # ID's of hosts looked up by DNS name.  
   
 my %managers; # Ip -> manager names  my %managers; # Ip -> manager names
   
 my %perlvar; # Will have the apache conf defined perl vars.  my %perlvar; # Will have the apache conf defined perl vars.
Line 425  sub ReadManagerTable { Line 418  sub ReadManagerTable {
       if ($host =~ "^#") {                  # Comment line.        if ($host =~ "^#") {                  # Comment line.
          next;           next;
       }        }
       if (!defined $hostip{$host}) { # This is a non cluster member        if (!defined &Apache::lonnet::get_host_ip($host)) { # This is a non cluster member
     #  The entry is of the form:      #  The entry is of the form:
     #    cluname:hostname      #    cluname:hostname
     #  cluname - A 'cluster hostname' is needed in order to negotiate      #  cluname - A 'cluster hostname' is needed in order to negotiate
Line 443  sub ReadManagerTable { Line 436  sub ReadManagerTable {
          }           }
       } else {        } else {
          logthis('<font color="green"> existing host'." $host</font>\n");           logthis('<font color="green"> existing host'." $host</font>\n");
          $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber           $managers{&Apache::lonnet::get_host_ip($host)} = $host;  # Use info from cluster tab if clumemeber
       }        }
    }     }
 }  }
Line 1033  sub ping_handler { Line 1026  sub ping_handler {
 sub pong_handler {  sub pong_handler {
     my ($cmd, $tail, $replyfd) = @_;      my ($cmd, $tail, $replyfd) = @_;
   
     my $reply=&reply("ping",$clientname);      my $reply=&Apache::lonnet::reply("ping",$clientname);
     &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");       &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 
     return 1;      return 1;
 }  }
Line 1143  sub load_handler { Line 1136  sub load_handler {
 sub user_load_handler {  sub user_load_handler {
     my ($cmd, $tail, $replyfd) = @_;      my ($cmd, $tail, $replyfd) = @_;
   
     my $userloadpercent=&userload();      my $userloadpercent=&Apache::lonnet::userload();
     &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");      &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
           
     return 1;      return 1;
Line 1269  sub du_handler { Line 1262  sub du_handler {
  my $code=sub {    my $code=sub { 
     if ($_=~/\.\d+\./) { return;}       if ($_=~/\.\d+\./) { return;} 
     if ($_=~/\.meta$/) { return;}      if ($_=~/\.meta$/) { return;}
       if (-d $_)         { return;}
     $total_size+=(stat($_))[7];      $total_size+=(stat($_))[7];
  };   };
  chdir($ududir);   chdir($ududir);
Line 1850  sub update_resource_handler { Line 1844  sub update_resource_handler {
     my $now=time;      my $now=time;
     my $since=$now-$atime;      my $since=$now-$atime;
     if ($since>$perlvar{'lonExpire'}) {      if ($since>$perlvar{'lonExpire'}) {
  my $reply=&reply("unsub:$fname","$clientname");   my $reply=&Apache::lonnet::reply("unsub:$fname","$clientname");
  &devalidate_meta_cache($fname);   &devalidate_meta_cache($fname);
  unlink("$fname");   unlink("$fname");
  unlink("$fname.meta");   unlink("$fname.meta");
     } else {      } else {
  my $transname="$fname.in.transfer";   my $transname="$fname.in.transfer";
  my $remoteurl=&reply("sub:$fname","$clientname");   my $remoteurl=&Apache::lonnet::reply("sub:$fname","$clientname");
  my $response;   my $response;
  alarm(120);   alarm(120);
  {   {
Line 1901  sub devalidate_meta_cache { Line 1895  sub devalidate_meta_cache {
     my ($url) = @_;      my ($url) = @_;
     use Cache::Memcached;      use Cache::Memcached;
     my $memcache = new Cache::Memcached({'servers'=>['127.0.0.1:11211']});      my $memcache = new Cache::Memcached({'servers'=>['127.0.0.1:11211']});
     $url = &declutter($url);      $url = &Apache::lonnet::declutter($url);
     $url =~ s-\.meta$--;      $url =~ s-\.meta$--;
     my $id = &escape('meta:'.$url);      my $id = &escape('meta:'.$url);
     $memcache->delete($id);      $memcache->delete($id);
 }  }
   
 sub declutter {  
     my $thisfn=shift;  
     $thisfn=~s/^\Q$perlvar{'lonDocRoot'}\E//;  
     $thisfn=~s/^\///;  
     $thisfn=~s|^adm/wrapper/||;  
     $thisfn=~s|^adm/coursedocs/showdoc/||;  
     $thisfn=~s/^res\///;  
     $thisfn=~s/\?.+$//;  
     return $thisfn;  
 }  
 #  #
 #   Fetch a user file from a remote server to the user's home directory  #   Fetch a user file from a remote server to the user's home directory
 #   userfiles subdir.  #   userfiles subdir.
Line 3600  sub get_domain_handler { Line 3584  sub get_domain_handler {
   
     return 1;      return 1;
 }  }
 &register_handler("getdom", \&get_id_handler, 0, 1, 0);  &register_handler("getdom", \&get_domain_handler, 0, 1, 0);
   
   
 #  #
Line 4452  sub get_institutional_code_format_handle Line 4436  sub get_institutional_code_format_handle
     \%cat_titles,      \%cat_titles,
     \%cat_order);      \%cat_order);
     if ($formatreply eq 'ok') {      if ($formatreply eq 'ok') {
  my $codes_str = &hash2str(%codes);   my $codes_str = &Apache::lonnet::hash2str(%codes);
  my $codetitles_str = &array2str(@codetitles);   my $codetitles_str = &Apache::lonnet::array2str(@codetitles);
  my $cat_titles_str = &hash2str(%cat_titles);   my $cat_titles_str = &Apache::lonnet::hash2str(%cat_titles);
  my $cat_order_str = &hash2str(%cat_order);   my $cat_order_str = &Apache::lonnet::hash2str(%cat_order);
  &Reply($client,   &Reply($client,
        $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'         $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
        .$cat_order_str."\n",         .$cat_order_str."\n",
Line 4631  sub student_photo_handler { Line 4615  sub student_photo_handler {
 }  }
 &register_handler("studentphoto", \&student_photo_handler, 0, 1, 0);  &register_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
   
   sub inst_usertypes_handler {
       my ($cmd, $domain, $client) = @_;
       my $res;
       my $userinput = $cmd.":".$domain; # For logging purposes.
       my (%typeshash,@order,$result);
       eval {
    local($SIG{__DIE__})='DEFAULT';
    $result=&localenroll::inst_usertypes($domain,\%typeshash,\@order);
       };
       if ($result eq 'ok') {
           if (keys(%typeshash) > 0) {
               foreach my $key (keys(%typeshash)) {
                   $res.=&escape($key).'='.&escape($typeshash{$key}).'&';
               }
           }
           $res=~s/\&$//;
           $res .= ':';
           if (@order > 0) {
               foreach my $item (@order) {
                   $res .= &escape($item).'&';
               }
           }
           $res=~s/\&$//;
       }
       &Reply($client, "$res\n", $userinput);
       return 1;
   }
   &register_handler("inst_usertypes", \&inst_usertypes_handler, 0, 1, 0);
   
 # mkpath makes all directories for a file, expects an absolute path with a  # mkpath makes all directories for a file, expects an absolute path with a
 # file or a trailing / if just a dir is passed  # file or a trailing / if just a dir is passed
 # returns 1 on success 0 on failure  # returns 1 on success 0 on failure
Line 5005  sub HUPSMAN {                      # sig Line 5018  sub HUPSMAN {                      # sig
 }  }
   
 #  #
 #    Kill off hashes that describe the host table prior to re-reading it.  
 #    Hashes affected are:  
 #       %hostid, %hostdom %hostip %hostdns.  
 #  
 sub KillHostHashes {  
     foreach my $key (keys %hostid) {  
  delete $hostid{$key};  
     }  
     foreach my $key (keys %hostdom) {  
  delete $hostdom{$key};  
     }  
     foreach my $key (keys %hostip) {  
  delete $hostip{$key};  
     }  
     foreach my $key (keys %hostdns) {  
  delete $hostdns{$key};  
     }  
 }  
 #  
 #   Read in the host table from file and distribute it into the various hashes:  
 #  
 #    - %hostid  -  Indexed by IP, the loncapa hostname.  
 #    - %hostdom -  Indexed by  loncapa hostname, the domain.  
 #    - %hostip  -  Indexed by hostid, the Ip address of the host.  
 sub ReadHostTable {  
   
     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";  
     my $myloncapaname = $perlvar{'lonHostID'};  
     Debug("My loncapa name is : $myloncapaname");  
     my %name_to_ip;  
     while (my $configline=<CONFIG>) {  
  if ($configline !~ /^\s*\#/ && $configline !~ /^\s*$/ ) {  
     my ($id,$domain,$role,$name)=split(/:/,$configline);  
     $name=~s/\s//g;  
     my $ip;  
     if (!exists($name_to_ip{$name})) {  
  $ip = gethostbyname($name);  
  if (!$ip || length($ip) ne 4) {  
     &logthis("Skipping host $id name $name no IP found\n");  
     next;  
  }  
  $ip=inet_ntoa($ip);  
  $name_to_ip{$name} = $ip;  
     } else {  
  $ip = $name_to_ip{$name};  
     }  
     $hostid{$ip}=$id;         # LonCAPA name of host by IP.  
     $hostdom{$id}=$domain;    # LonCAPA domain name of host.   
     $hostname{$id}=$name;     # LonCAPA name -> DNS name  
     $hostip{$id}=$ip;         # IP address of host.  
     $hostdns{$name} = $id;    # LonCAPA name of host by DNS.  
   
     if ($id eq $perlvar{'lonHostID'}) {   
  Debug("Found me in the host table: $name");  
  $thisserver=$name;   
     }  
  }  
     }  
     close(CONFIG);  
 }  
 #  
 #  Reload the Apache daemon's state.  #  Reload the Apache daemon's state.
 #  This is done by invoking /home/httpd/perl/apachereload  #  This is done by invoking /home/httpd/perl/apachereload
 #  a setuid perl script that can be root for us to do this job.  #  a setuid perl script that can be root for us to do this job.
Line 5096  sub UpdateHosts { Line 5048  sub UpdateHosts {
     #  either dropped or changed hosts.  Note that the re-read of the table      #  either dropped or changed hosts.  Note that the re-read of the table
     #  will take care of new and changed hosts as connections come into being.      #  will take care of new and changed hosts as connections come into being.
   
       #FIXME need a way to tell lonnet that it needs to reset host
       #cached host info
   
     KillHostHashes;      foreach my $child (keys(%children)) {
     ReadHostTable;  
   
     foreach my $child (keys %children) {  
  my $childip = $children{$child};   my $childip = $children{$child};
  if(!$hostid{$childip}) {   if (defined(&Apache::lonnet::get_hosts_from_ip($childip))) {
     logthis('<font color="blue"> UpdateHosts killing child '      logthis('<font color="blue"> UpdateHosts killing child '
     ." $child for ip $childip </font>");      ." $child for ip $childip </font>");
     kill('INT', $child);      kill('INT', $child);
Line 5262  sub status { Line 5213  sub status {
     $0='lond: '.$what.' '.$local;      $0='lond: '.$what.' '.$local;
 }  }
   
 # ----------------------------------------------------------- Send USR1 to lonc  
   
 sub reconlonc {  
     my $peerfile=shift;  
     &logthis("Trying to reconnect for $peerfile");  
     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";  
     if (my $fh=IO::File->new("$loncfile")) {  
  my $loncpid=<$fh>;  
         chomp($loncpid);  
         if (kill 0 => $loncpid) {  
     &logthis("lonc at pid $loncpid responding, sending USR1");  
             kill USR1 => $loncpid;  
         } else {  
     &logthis(  
               "<font color='red'>CRITICAL: "  
              ."lonc at pid $loncpid not responding, giving up</font>");  
         }  
     } else {  
       &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');  
     }  
 }  
   
 # -------------------------------------------------- Non-critical communication  
   
 sub subreply {  
     my ($cmd,$server)=@_;  
     my $peerfile="$perlvar{'lonSockDir'}/".$hostname{$server};  
     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",  
                                       Type    => SOCK_STREAM,  
                                       Timeout => 10)  
        or return "con_lost";  
     print $sclient "sethost:$server:$cmd\n";  
     my $answer=<$sclient>;  
     chomp($answer);  
     if (!$answer) { $answer="con_lost"; }  
     return $answer;  
 }  
   
 sub reply {  
   my ($cmd,$server)=@_;  
   my $answer;  
   if ($server ne $currenthostid) {   
     $answer=subreply($cmd,$server);  
     if ($answer eq 'con_lost') {  
  $answer=subreply("ping",$server);  
         if ($answer ne $server) {  
     &logthis("sub reply: answer != server answer is $answer, server is $server");  
            &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$server});  
         }  
         $answer=subreply($cmd,$server);  
     }  
   } else {  
     $answer='self_reply';  
   }   
   return $answer;  
 }  
   
 # -------------------------------------------------------------- Talk to lonsql  # -------------------------------------------------------------- Talk to lonsql
   
 sub sql_reply {  sub sql_reply {
Line 5387  $SIG{USR1} = \&checkchildren; Line 5281  $SIG{USR1} = \&checkchildren;
 $SIG{USR2} = \&UpdateHosts;  $SIG{USR2} = \&UpdateHosts;
   
 #  Read the host hashes:  #  Read the host hashes:
   &Apache::lonnet::load_hosts_tab();
 ReadHostTable;  
   
 my $dist=`$perlvar{'lonDaemons'}/distprobe`;  my $dist=`$perlvar{'lonDaemons'}/distprobe`;
   
Line 5467  sub make_new_child { Line 5360  sub make_new_child {
 #        my $tmpsnum=0;            # Now global  #        my $tmpsnum=0;            # Now global
 #---------------------------------------------------- kerberos 5 initialization  #---------------------------------------------------- kerberos 5 initialization
         &Authen::Krb5::init_context();          &Authen::Krb5::init_context();
  unless (($dist eq 'fedora5') || ($dist eq 'fedora4')    unless (($dist eq 'fedora5') || ($dist eq 'fedora4') ||  
  || ($dist eq 'suse9.3')) {   ($dist eq 'fedora6') || ($dist eq 'suse9.3')) {
     &Authen::Krb5::init_ets();      &Authen::Krb5::init_ets();
  }   }
   
Line 5482  sub make_new_child { Line 5375  sub make_new_child {
   
  my $outsideip=$clientip;   my $outsideip=$clientip;
  if ($clientip eq '127.0.0.1') {   if ($clientip eq '127.0.0.1') {
     $outsideip=$hostip{$perlvar{'lonHostID'}};      $outsideip=&Apache::lonnet::get_host_ip($perlvar{'lonHostID'});
  }   }
   
  my $clientrec=($hostid{$outsideip}     ne undef);   my $clientrec=defined(&Apache::lonnet::get_hosts_from_ip($outsideip));
  my $ismanager=($managers{$outsideip}    ne undef);   my $ismanager=($managers{$outsideip}    ne undef);
  $clientname  = "[unknonwn]";   $clientname  = "[unknonwn]";
  if($clientrec) { # Establish client type.   if($clientrec) { # Establish client type.
     $ConnectionType = "client";      $ConnectionType = "client";
     $clientname = $hostid{$outsideip};      $clientname = (&Apache::lonnet::get_hosts_from_ip($outsideip))[-1];
     if($ismanager) {      if($ismanager) {
  $ConnectionType = "both";   $ConnectionType = "both";
     }      }
Line 5597  sub make_new_child { Line 5490  sub make_new_child {
     
  if ($clientok) {   if ($clientok) {
 # ---------------- New known client connecting, could mean machine online again  # ---------------- New known client connecting, could mean machine online again
           if (&Apache::lonnet::get_host_ip($currenthostid) ne $clientip 
     foreach my $id (keys(%hostip)) {   && $clientip ne '127.0.0.1') {
  if ($hostip{$id} ne $clientip ||   &Apache::lonnet::reconlonc();
     $hostip{$currenthostid} eq $clientip) {  
     # no need to try to do recon's to myself  
     next;  
  }  
  &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$id});  
     }      }
     &logthis("<font color='green'>Established connection: $clientname</font>");      &logthis("<font color='green'>Established connection: $clientname</font>");
     &status('Will listen to '.$clientname);      &status('Will listen to '.$clientname);
Line 5881  sub validate_user { Line 5769  sub validate_user {
  my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;   my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
  my $krbserver  = &Authen::Krb5::parse_name($krbservice);   my $krbserver  = &Authen::Krb5::parse_name($krbservice);
  my $credentials= &Authen::Krb5::cc_default();   my $credentials= &Authen::Krb5::cc_default();
  $credentials->initialize($krbclient);   $credentials->initialize(&Authen::Krb5::parse_name($user.'@'
                                                                    .$contentpwd));
  my $krbreturn  = &Authen::Krb5::get_in_tkt_with_password($krbclient,   my $krbreturn  = &Authen::Krb5::get_in_tkt_with_password($krbclient,
  $krbserver,   $krbserver,
  $password,   $password,
Line 5896  sub validate_user { Line 5785  sub validate_user {
        $password,          $password, 
        $contentpwd,         $contentpwd,
        $domain);         $domain);
       if ($validated < 0) {
    &logthis("localauth for $contentpwd $user:$domain returned a $validated");
    $validated = 0;
       }
  } else { # Unrecognized auth is also bad.   } else { # Unrecognized auth is also bad.
     $validated = 0;      $validated = 0;
  }   }
Line 6282  sub sethost { Line 6175  sub sethost {
     }      }
   
     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }      if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {      if (&Apache::lonnet::get_host_ip($perlvar{'lonHostID'}) 
    eq &Apache::lonnet::get_host_ip($hostid)) {
  $currenthostid  =$hostid;   $currenthostid  =$hostid;
  $currentdomainid=$hostdom{$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 {      } else {
  &logthis("Requested host id $hostid not an alias of ".   &logthis("Requested host id $hostid not an alias of ".
Line 6300  sub version { Line 6194  sub version {
     return "version:$VERSION";      return "version:$VERSION";
 }  }
   
 #There is a copy of this in lonnet.pm  
 sub userload {  
     my $numusers=0;  
     {  
  opendir(LONIDS,$perlvar{'lonIDsDir'});  
  my $filename;  
  my $curtime=time;  
  while ($filename=readdir(LONIDS)) {  
     if ($filename eq '.' || $filename eq '..') {next;}  
     my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];  
     if ($curtime-$mtime < 1800) { $numusers++; }  
  }  
  closedir(LONIDS);  
     }  
     my $userloadpercent=0;  
     my $maxuserload=$perlvar{'lonUserLoadLim'};  
     if ($maxuserload) {  
  $userloadpercent=100*$numusers/$maxuserload;  
     }  
     $userloadpercent=sprintf("%.2f",$userloadpercent);  
     return $userloadpercent;  
 }  
   
 # Routines for serializing arrays and hashes (copies from lonnet)  
   
 sub array2str {  
   my (@array) = @_;  
   my $result=&arrayref2str(\@array);  
   $result=~s/^__ARRAY_REF__//;  
   $result=~s/__END_ARRAY_REF__$//;  
   return $result;  
 }  
                                                                                    
 sub arrayref2str {  
   my ($arrayref) = @_;  
   my $result='__ARRAY_REF__';  
   foreach my $elem (@$arrayref) {  
     if(ref($elem) eq 'ARRAY') {  
       $result.=&arrayref2str($elem).'&';  
     } elsif(ref($elem) eq 'HASH') {  
       $result.=&hashref2str($elem).'&';  
     } elsif(ref($elem)) {  
       #print("Got a ref of ".(ref($elem))." skipping.");  
     } else {  
       $result.=&escape($elem).'&';  
     }  
   }  
   $result=~s/\&$//;  
   $result .= '__END_ARRAY_REF__';  
   return $result;  
 }  
                                                                                    
 sub hash2str {  
   my (%hash) = @_;  
   my $result=&hashref2str(\%hash);  
   $result=~s/^__HASH_REF__//;  
   $result=~s/__END_HASH_REF__$//;  
   return $result;  
 }  
                                                                                    
 sub hashref2str {  
   my ($hashref)=@_;  
   my $result='__HASH_REF__';  
   foreach (sort(keys(%$hashref))) {  
     if (ref($_) eq 'ARRAY') {  
       $result.=&arrayref2str($_).'=';  
     } elsif (ref($_) eq 'HASH') {  
       $result.=&hashref2str($_).'=';  
     } elsif (ref($_)) {  
       $result.='=';  
       #print("Got a ref of ".(ref($_))." skipping.");  
     } else {  
         if ($_) {$result.=&escape($_).'=';} else { last; }  
     }  
   
     if(ref($hashref->{$_}) eq 'ARRAY') {  
       $result.=&arrayref2str($hashref->{$_}).'&';  
     } elsif(ref($hashref->{$_}) eq 'HASH') {  
       $result.=&hashref2str($hashref->{$_}).'&';  
     } elsif(ref($hashref->{$_})) {  
        $result.='&';  
       #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");  
     } else {  
       $result.=&escape($hashref->{$_}).'&';  
     }  
   }  
   $result=~s/\&$//;  
   $result .= '__END_HASH_REF__';  
   return $result;  
 }  
   
 # ----------------------------------- POD (plain old documentation, CPAN style)  # ----------------------------------- POD (plain old documentation, CPAN style)
   
Removed from v.1.356  
changed lines
  Added in v.1.370

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