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Diff for /loncom/lond between versions 1.196 and 1.207

version 1.196, 2004/06/17 11:02:25 version 1.207, 2004/07/23 11:03:05
Line 51  use LONCAPA::ConfigFileEdit; Line 51  use LONCAPA::ConfigFileEdit;
 use LONCAPA::lonlocal;  use LONCAPA::lonlocal;
 use LONCAPA::lonssl;  use LONCAPA::lonssl;
   
 my $DEBUG = 11;       # Non zero to enable debug log entries.  my $DEBUG = 0;       # Non zero to enable debug log entries.
   
 my $status='';  my $status='';
 my $lastlog='';  my $lastlog='';
Line 69  my $clientname;   # LonCAPA name of clie Line 69  my $clientname;   # LonCAPA name of clie
 my $server;  my $server;
 my $thisserver; # DNS of us.  my $thisserver; # DNS of us.
   
   my $keymode;
   
   my $cipher; # Cipher key negotiated with client
   my $tmpsnum = 0; # Id of tmpputs.
   
 #   # 
 #   Connection type is:  #   Connection type is:
 #      client                   - All client actions are allowed  #      client                   - All client actions are allowed
Line 88  my %managers;   # Ip -> manager names Line 93  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.
   
 #  #
   #   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:
   #          A reference to a sub that executes the request corresponding to the keyword.
   #          A flag that is true if the request must be encoded to be acceptable.
   #          A mask with bits as follows:
   #                      CLIENT_OK    - Set when the function is allowed by ordinary clients
   #                      MANAGER_OK   - Set when the function is allowed to manager clients.
   #
   my $CLIENT_OK  = 1;
   my $MANAGER_OK = 2;
   my %Dispatcher;
   
   
   #
 #  The array below are password error strings."  #  The array below are password error strings."
 #  #
 my $lastpwderror    = 13; # Largest error number from lcpasswd.  my $lastpwderror    = 13; # Largest error number from lcpasswd.
Line 125  my @adderrors    = ("ok", Line 144  my @adderrors    = ("ok",
     "lcuseradd Password mismatch");      "lcuseradd Password mismatch");
   
   
   
   #
   #   Statistics that are maintained and dislayed in the status line.
   #
   my $Transactions; # Number of attempted transactions.
   my $Failures; # Number of transcations failed.
   
   #   ResetStatistics: 
   #      Resets the statistics counters:
   #
   sub ResetStatistics {
       $Transactions = 0;
       $Failures     = 0;
   }
   
   
   
 #------------------------------------------------------------------------  #------------------------------------------------------------------------
 #  #
 #   LocalConnection  #   LocalConnection
Line 352  sub ReadManagerTable { Line 388  sub ReadManagerTable {
    while(my $host = <MANAGERS>) {     while(my $host = <MANAGERS>) {
       chomp($host);        chomp($host);
       if ($host =~ "^#") {                  # Comment line.        if ($host =~ "^#") {                  # Comment line.
          logthis('<font color="green"> Skipping line: '. "$host</font>\n");  
          next;           next;
       }        }
       if (!defined $hostip{$host}) { # This is a non cluster member        if (!defined $hostip{$host}) { # This is a non cluster member
Line 898  sub EditFile { Line 933  sub EditFile {
   
     return "ok\n";      return "ok\n";
 }  }
   
   #---------------------------------------------------------------
   #
   # Manipulation of hash based databases (factoring out common code
   # for later use as we refactor.
   #
   #  Ties a domain level resource file to a hash.
   #  If requested a history entry is created in the associated hist file.
   #
   #  Parameters:
   #     domain    - Name of the domain in which the resource file lives.
   #     namespace - Name of the hash within that domain.
   #     how       - How to tie the hash (e.g. GDBM_WRCREAT()).
   #     loghead   - Optional parameter, if present a log entry is created
   #                 in the associated history file and this is the first part
   #                  of that entry.
   #     logtail   - Goes along with loghead,  The actual logentry is of the
   #                 form $loghead:<timestamp>:logtail.
   # Returns:
   #    Reference to a hash bound to the db file or alternatively undef
   #    if the tie failed.
   #
   sub TieDomainHash {
       my ($domain, 
    $namespace,
    $how)     = @_;
       
       # Filter out any whitespace in the domain name:
       
       $domain =~ s/\W//g;
       
       # We have enough to go on to tie the hash:
       
       my $user_top_dir   = $perlvar{'lonUsersDir'};
       my $domain_dir     = $user_top_dir."/$domain";
       my $resource_file  = $domain_dir."/$namespace.db";
       my %hash;
       if(tie(%hash, 'GDBM_File', $resource_file, $how, 0640)) {
    if (scalar @_) { # Need to log the operation.
       my $logFh = IO::File->new(">>domain_dir/$namespace.hist");
       if($logFh) {
    my $timestamp = time;
    my ($loghead, $logtail) = @_;
    print $logFh "$loghead:$timestamp:$logtail\n";
       }
    }
    return \%hash; # Return the tied hash.
       }
       else {
    return undef; # Tie failed.
       }
   }
   
   #
   #   Ties a user's resource file to a hash.  
   #   If necessary, an appropriate history
   #   log file entry is made as well.
   #   This sub factors out common code from the subs that manipulate
   #   the various gdbm files that keep keyword value pairs.
   # Parameters:
   #   domain       - Name of the domain the user is in.
   #   user         - Name of the 'current user'.
   #   namespace    - Namespace representing the file to tie.
   #   how          - What the tie is done to (e.g. GDBM_WRCREAT().
   #   loghead      - Optional first part of log entry if there may be a
   #                  history file.
   #   what         - Optional tail of log entry if there may be a history
   #                  file.
   # Returns:
   #   hash to which the database is tied.  It's up to the caller to untie.
   #   undef if the has could not be tied.
   #
   sub TieUserHash {
       my ($domain,
    $user,
    $namespace,
    $how)       = @_;
   
       
       $namespace=~s/\//\_/g; # / -> _
       $namespace=~s/\W//g; # whitespace eliminated.
       my $proname     = propath($domain, $user);
      
       # If this is a namespace for which a history is kept,
       # make the history log entry:
       
       
       if (($namespace =~/^nohist\_/) && (scalar @_ > 0)) {
    my $args = scalar @_;
    Debug(" Opening history: $namespace $args");
    my $hfh = IO::File->new(">>$proname/$namespace.hist"); 
    if($hfh) {
       my $now = time;
       my $loghead  = shift;
       my $what    = shift;
       print $hfh "$loghead:$now:$what\n";
    }
       }
       #  Tie the database.
       
       my %hash;
       if(tie(%hash, 'GDBM_File', "$proname/$namespace.db",
      $how, 0640)) {
    return \%hash;
       }
       else {
    return undef;
       }
       
   }
   #---------------------------------------------------------------
   #
   #   Getting, decoding and dispatching requests:
   #
   
   #
   #   Get a Request:
   #   Gets a Request message from the client.  The transaction
   #   is defined as a 'line' of text.  We remove the new line
   #   from the text line.  
   #   
   sub GetRequest {
       my $input = <$client>;
       chomp($input);
   
       Debug("Request = $input\n");
   
       &status('Processing '.$clientname.':'.$input);
   
       return $input;
   }
   #
   #   Decipher encoded traffic
   #  Parameters:
   #     input      - Encoded data.
   #  Returns:
   #     Decoded data or undef if encryption key was not yet negotiated.
   #  Implicit input:
   #     cipher  - This global holds the negotiated encryption key.
   #
   sub Decipher {
       my ($input)  = @_;
       my $output = '';
      
      
       if($cipher) {
    my($enc, $enclength, $encinput) = split(/:/, $input);
    for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
       $output .= 
    $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
    }
    return substr($output, 0, $enclength);
       } else {
    return undef;
       }
   }
   
   #
   #   Register a command processor.  This function is invoked to register a sub
   #   to process a request.  Once registered, the ProcessRequest sub can automatically
   #   dispatch requests to an appropriate sub, and do the top level validity checking
   #   as well:
   #    - Is the keyword recognized.
   #    - Is the proper client type attempting the request.
   #    - Is the request encrypted if it has to be.
   #   Parameters:
   #    $request_name         - Name of the request being registered.
   #                           This is the command request that will match
   #                           against the hash keywords to lookup the information
   #                           associated with the dispatch information.
   #    $procedure           - Reference to a sub to call to process the request.
   #                           All subs get called as follows:
   #                             Procedure($cmd, $tail, $replyfd, $key)
   #                             $cmd    - the actual keyword that invoked us.
   #                             $tail   - the tail of the request that invoked us.
   #                             $replyfd- File descriptor connected to the client
   #    $must_encode          - True if the request must be encoded to be good.
   #    $client_ok            - True if it's ok for a client to request this.
   #    $manager_ok           - True if it's ok for a manager to request this.
   # Side effects:
   #      - On success, the Dispatcher hash has an entry added for the key $RequestName
   #      - On failure, the program will die as it's a bad internal bug to try to 
   #        register a duplicate command handler.
   #
   sub RegisterHandler {
       my ($request_name,
    $procedure,
    $must_encode,
    $client_ok,
    $manager_ok)   = @_;
   
       #  Don't allow duplication#
      
       if (defined $Dispatcher{$request_name}) {
    die "Attempting to define a duplicate request handler for $request_name\n";
       }
       #   Build the client type mask:
       
       my $client_type_mask = 0;
       if($client_ok) {
    $client_type_mask  |= $CLIENT_OK;
       }
       if($manager_ok) {
    $client_type_mask  |= $MANAGER_OK;
       }
      
       #  Enter the hash:
         
       my @entry = ($procedure, $must_encode, $client_type_mask);
      
       $Dispatcher{$request_name} = \@entry;
      
      
   }
   
   
   #------------------------------------------------------------------
   
   
   
   
 #  #
 #  Convert an error return code from lcpasswd to a string value.  #  Convert an error return code from lcpasswd to a string value.
 #  #
Line 1218  sub logstatus { Line 1474  sub logstatus {
     {      {
     my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");      my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
     print $fh $$."\t".$clientname."\t".$currenthostid."\t"      print $fh $$."\t".$clientname."\t".$currenthostid."\t"
  .$status."\t".$lastlog."\n";   .$status."\t".$lastlog."\t $keymode\n";
     $fh->close();      $fh->close();
     }      }
     &status("Finished londstatus.txt");      &status("Finished londstatus.txt");
     {      {
  my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");   my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
         print $fh $status."\n".$lastlog."\n".time;          print $fh $status."\n".$lastlog."\n".time."\n$keymode";
         $fh->close();          $fh->close();
     }      }
     &status("Finished logging");      &status("Finished logging");
Line 1424  while (1) { Line 1680  while (1) {
   
 sub make_new_child {  sub make_new_child {
     my $pid;      my $pid;
     my $cipher;  #    my $cipher;     # Now global
     my $sigset;      my $sigset;
   
     $client = shift;      $client = shift;
Line 1483  sub make_new_child { Line 1739  sub make_new_child {
         sigprocmask(SIG_UNBLOCK, $sigset)          sigprocmask(SIG_UNBLOCK, $sigset)
             or die "Can't unblock SIGINT for fork: $!\n";              or die "Can't unblock SIGINT for fork: $!\n";
   
         my $tmpsnum=0;  #        my $tmpsnum=0;            # Now global
 #---------------------------------------------------- kerberos 5 initialization  #---------------------------------------------------- kerberos 5 initialization
         &Authen::Krb5::init_context();          &Authen::Krb5::init_context();
         &Authen::Krb5::init_ets();          &Authen::Krb5::init_ets();
Line 1556  sub make_new_child { Line 1812  sub make_new_child {
  print $client "ok:local\n";   print $client "ok:local\n";
  &logthis('<font color="green"'   &logthis('<font color="green"'
  . "Successful local authentication </font>");   . "Successful local authentication </font>");
    $keymode = "local"
     } else {      } else {
  Debug("Failed to get local key");   Debug("Failed to get local key");
  $clientok = 0;   $clientok = 0;
Line 1570  sub make_new_child { Line 1827  sub make_new_child {
  $cipher       = new IDEA($cipherkey);   $cipher       = new IDEA($cipherkey);
  &logthis('<font color="green">'   &logthis('<font color="green">'
  ."Successfull ssl authentication with $clientname </font>");   ."Successfull ssl authentication with $clientname </font>");
    $keymode = "ssl";
             
     } else {      } else {
  $clientok = 0;   $clientok = 0;
Line 1583  sub make_new_child { Line 1841  sub make_new_child {
  &logthis('<font color="green">'   &logthis('<font color="green">'
  ."Successful insecure authentication with $clientname </font>");   ."Successful insecure authentication with $clientname </font>");
  print $client "ok\n";   print $client "ok\n";
    $keymode = "insecure";
     } else {      } else {
  &logthis('<font color="yellow">'   &logthis('<font color="yellow">'
   ."Attempted insecure connection disallowed </font>");    ."Attempted insecure connection disallowed </font>");
Line 2228  sub make_new_child { Line 2487  sub make_new_child {
 # ------------------------------------------------------------------------- put  # ------------------------------------------------------------------------- put
  } elsif ($userinput =~ /^put/) {   } elsif ($userinput =~ /^put/) {
     if(isClient) {      if(isClient) {
  my ($cmd,$udom,$uname,$namespace,$what)   my ($cmd,$udom,$uname,$namespace,$what,@extras)
     =split(/:/,$userinput);      =split(/:/,$userinput);
  $namespace=~s/\//\_/g;   $namespace=~s/\//\_/g;
  $namespace=~s/\W//g;   $namespace=~s/\W//g;
  if ($namespace ne 'roles') {   if ($namespace ne 'roles') {
                               if (@extras) {
                                   $what .= ':'.join(':',@extras);
                               }
     chomp($what);      chomp($what);
     my $proname=propath($udom,$uname);      my $proname=propath($udom,$uname);
     my $now=time;      my $now=time;
Line 2831  sub make_new_child { Line 3093  sub make_new_child {
  my %hash;   my %hash;
  if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {   if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
     foreach my $pair (@pairs) {      foreach my $pair (@pairs) {
  my ($key,$value)=split(/=/,$pair);   my ($key,$descr,$inst_code)=split(/=/,$pair);
  $hash{$key}=$value.':'.$now;   $hash{$key}=$descr.':'.$inst_code.':'.$now;
     }      }
     if (untie(%hash)) {      if (untie(%hash)) {
  print $client "ok\n";   print $client "ok\n";
Line 2867  sub make_new_child { Line 3129  sub make_new_child {
  my %hash;   my %hash;
  if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {   if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
     while (my ($key,$value) = each(%hash)) {      while (my ($key,$value) = each(%hash)) {
  my ($descr,$lasttime)=split(/\:/,$value);                                  my ($descr,$lasttime,$inst_code);
                                   if ($value =~ m/^([^\:]*):([^\:]*):(\d+)$/) {
       ($descr,$inst_code,$lasttime)=($1,$2,$3);
                                   } else {
                                       ($descr,$lasttime) = split(/\:/,$value);
                                   }
  if ($lasttime<$since) { next; }   if ($lasttime<$since) { next; }
  if ($description eq '.') {   if ($description eq '.') {
     $qresult.=$key.'='.$descr.'&';      $qresult.=$key.'='.$descr.':'.$inst_code.'&';
  } else {   } else {
     my $unescapeVal = &unescape($descr);      my $unescapeVal = &unescape($descr);
     if (eval('$unescapeVal=~/\Q$description\E/i')) {      if (eval('$unescapeVal=~/\Q$description\E/i')) {
  $qresult.="$key=$descr&";   $qresult.=$key.'='.$descr.':'.$inst_code.'&';
     }      }
  }   }
     }      }
Line 3028  sub make_new_child { Line 3295  sub make_new_child {
  Reply($client, "refused\n", $userinput);   Reply($client, "refused\n", $userinput);
             
     }      }
   # ----------------------------------------- portfolio directory list (portls)
                   } elsif ($userinput =~ /^portls/) {
                       if(isClient) {
                           my ($cmd,$uname,$udom)=split(/:/,$userinput);
                           my $udir=propath($udom,$uname).'/userfiles/portfolio';
                           my $dirLine='';
                           my $dirContents='';
                           if (opendir(LSDIR,$udir.'/')){
                               while ($dirLine = readdir(LSDIR)){
                                   $dirContents = $dirContents.$dirLine.'<br />';
                               }
                           } else {
                               $dirContents = "No directory found\n";
                           }
                           print $client $dirContents."\n";
                       } else {
                           Reply($client, "refused\n", $userinput);
                       }
 # -------------------------------------------------------------------------- ls  # -------------------------------------------------------------------------- ls
  } elsif ($userinput =~ /^ls/) {   } elsif ($userinput =~ /^ls/) {
     if(isClient) {      if(isClient) {
Line 3115  sub make_new_child { Line 3400  sub make_new_child {
  print $client "refused\n";   print $client "refused\n";
     }      }
 #------------------------------- is auto-enrollment enabled?  #------------------------------- is auto-enrollment enabled?
                 } elsif ($userinput =~/^autorun/) {                  } elsif ($userinput =~/^autorun:/) {
                     if (isClient) {                      if (isClient) {
                         my $outcome = &localenroll::run();                          my ($cmd,$cdom) = split(/:/,$userinput);
                           my $outcome = &localenroll::run($cdom);
                         print $client "$outcome\n";                          print $client "$outcome\n";
                     } else {                      } else {
                         print $client "0\n";                          print $client "0\n";
                     }                      }
 #------------------------------- get official sections (for auto-enrollment).  #------------------------------- get official sections (for auto-enrollment).
                 } elsif ($userinput =~/^autogetsections/) {                  } elsif ($userinput =~/^autogetsections:/) {
                     if (isClient) {                      if (isClient) {
                         my ($cmd,$coursecode)=split(/:/,$userinput);                          my ($cmd,$coursecode,$cdom)=split(/:/,$userinput);
                         my @secs = &localenroll::get_sections($coursecode);                          my @secs = &localenroll::get_sections($coursecode,$cdom);
                         my $seclist = &escape(join(':',@secs));                          my $seclist = &escape(join(':',@secs));
                         print $client "$seclist\n";                          print $client "$seclist\n";
                     } else {                      } else {
                         print $client "refused\n";                          print $client "refused\n";
                     }                      }
 #----------------------- validate owner of new course section (for auto-enrollment).  #----------------------- validate owner of new course section (for auto-enrollment).
                 } elsif ($userinput =~/^autonewcourse/) {                  } elsif ($userinput =~/^autonewcourse:/) {
                     if (isClient) {                      if (isClient) {
                         my ($cmd,$course_id,$owner)=split(/:/,$userinput);                          my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput);
                         my $outcome = &localenroll::new_course($course_id,$owner);                          my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
                         print $client "$outcome\n";                          print $client "$outcome\n";
                     } else {                      } else {
                         print $client "refused\n";                          print $client "refused\n";
                     }                      }
 #-------------- validate course section in schedule of classes (for auto-enrollment).  #-------------- validate course section in schedule of classes (for auto-enrollment).
                 } elsif ($userinput =~/^autovalidatecourse/) {                  } elsif ($userinput =~/^autovalidatecourse:/) {
                     if (isClient) {                      if (isClient) {
                         my ($cmd,$course_id)=split(/:/,$userinput);                          my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput);
                         my $outcome=&localenroll::validate_courseID($course_id);                          my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
                         print $client "$outcome\n";                          print $client "$outcome\n";
                     } else {                      } else {
                         print $client "refused\n";                          print $client "refused\n";
                     }                      }
 #--------------------------- create password for new user (for auto-enrollment).  #--------------------------- create password for new user (for auto-enrollment).
                 } elsif ($userinput =~/^autocreatepassword/) {                  } elsif ($userinput =~/^autocreatepassword:/) {
                     if (isClient) {                      if (isClient) {
                         my ($cmd,$authparam)=split(/:/,$userinput);                          my ($cmd,$authparam,$cdom)=split(/:/,$userinput);
                         my ($create_passwd,$authchk) = @_;                          my ($create_passwd,$authchk);
                         ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam);                          ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam,$cdom);
                         print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n";                          print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n";
                     } else {                      } else {
                         print $client "refused\n";                          print $client "refused\n";
                     }                      }
 #---------------------------  read and remove temporary files (for auto-enrollment).  #---------------------------  read and remove temporary files (for auto-enrollment).
                 } elsif ($userinput =~/^autoretrieve/) {                  } elsif ($userinput =~/^autoretrieve:/) {
                     if (isClient) {                      if (isClient) {
                         my ($cmd,$filename) = split(/:/,$userinput);                          my ($cmd,$filename) = split(/:/,$userinput);
                         my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;                          my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
Line 3186  sub make_new_child { Line 3472  sub make_new_child {
                     } else {                      } else {
                         print $client "refused\n";                          print $client "refused\n";
                     }                      }
   #---------------------  read and retrieve institutional code format (for support form).
                   } elsif ($userinput =~/^autoinstcodeformat:/) {
                       if (isClient) {
                           my $reply;
                           my($cmd,$cdom,$course) = split(/:/,$userinput);
                           my @pairs = split/\&/,$course;
                           my %instcodes = ();
                           my %codes = ();
                           my @codetitles = ();
                           my %cat_titles = ();
                           my %cat_order = ();
                           foreach (@pairs) {
                               my ($key,$value) = split/=/,$_;
                               $instcodes{&unescape($key)} = &unescape($value);
                           }
                           my $formatreply = &localenroll::instcode_format($cdom,\%instcodes,\%codes,\@codetitles,\%cat_titles,\%cat_order);
                           if ($formatreply eq 'ok') {
                               my $codes_str = &hash2str(%codes);
                               my $codetitles_str = &array2str(@codetitles);
                               my $cat_titles_str = &hash2str(%cat_titles);
                               my $cat_order_str = &hash2str(%cat_order);
                               print $client $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'.$cat_order_str."\n";
                           }
                       } else {
                           print $client "refused\n";
                       }
 # ------------------------------------------------------------- unknown command  # ------------------------------------------------------------- unknown command
   
  } else {   } else {
Line 3194  sub make_new_child { Line 3506  sub make_new_child {
  }   }
 # -------------------------------------------------------------------- complete  # -------------------------------------------------------------------- complete
  alarm(0);   alarm(0);
  &status('Listening to '.$clientname);   &status('Listening to '.$clientname." ($keymode)");
     }      }
 # --------------------------------------------- client unknown or fishy, refuse  # --------------------------------------------- client unknown or fishy, refuse
  } else {   } else {
Line 3593  sub userload { Line 3905  sub userload {
     return $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.1.196  
changed lines
  Added in v.1.207

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