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Diff for /loncom/lond between versions 1.178.2.23 and 1.179

version 1.178.2.23, 2004/05/07 17:57:18 version 1.179, 2004/02/24 16:53:16
Line 20 Line 20
 #  #
 # You should have received a copy of the GNU General Public License  # You should have received a copy of the GNU General Public License
 # along with LON-CAPA; if not, write to the Free Software  # along with LON-CAPA; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA      # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 #  #
 # /home/httpd/html/adm/gpl.txt  # /home/httpd/html/adm/gpl.txt
 #  #
Line 48  use localauth; Line 48  use localauth;
 use File::Copy;  use File::Copy;
 use LONCAPA::ConfigFileEdit;  use LONCAPA::ConfigFileEdit;
   
 my $DEBUG = 1;       # 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 62  my $client; Line 62  my $client;
 my $clientip;  my $clientip;
 my $clientname;  my $clientname;
   
 my $cipher; # Cipher key negotiated with client.  
 my $tmpsnum = 0;; # Id of tmpputs.  
   
 my $server;  my $server;
 my $thisserver;  my $thisserver;
   
Line 86  my %managers;   # Ip -> manager names Line 83  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 135  my @adderrors    = ("ok", Line 119  my @adderrors    = ("ok",
     "lcuseradd Could not add user.",      "lcuseradd Could not add user.",
     "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;  
 }  
   
 #  
 #   Return true if client is a manager.  
 #  
 sub isManager {  
     return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));  
 }  
 #  
 #   Return tru if client can do client functions  
 #  
 sub isClient {  
     return (($ConnectionType eq "client") || ($ConnectionType eq "both"));  
 }  
 #  
 #  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    = shift;  
     my $namespace = shift;  
     my $how       = shift;  
       
     # Filter out any whitespace in the domain name:  
       
     $domain =~ s/\W//g;  
       
     # We have enough to go on to tie the hash:  
       
     my $UserTopDir   = $perlvar{'lonUsersDir'};  
     my $DomainDir    = $UserTopDir."/$domain";  
     my $ResourceFile = $DomainDir."/$namespace.db";  
     my %hash;  
     if(tie(%hash, 'GDBM_File', $ResourceFile, $how, 0640)) {  
  if (scalar @_) { # Need to log the operation.  
     my $logFh = IO::File->new(">>$DomainDir/$namespace.hist");  
     if($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      = shift;  
     my $user        = shift;  
     my $namespace   = shift;  
     my $how         = shift;  
       
     $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;  
     }  
       
 }  
   
 #  
 #   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  = shift;  
     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:  
 #    $RequestName         - 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  
 #    $MustEncode          - True if the request must be encoded to be good.  
 #    $ClientOk            - True if it's ok for a client to request this.  
 #    $ManagerOk           - 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 $RequestName    = shift;  
     my $Procedure      = shift;  
     my $MustEncode     = shift;  
     my $ClientOk       = shift;  
     my $ManagerOk      = shift;  
      
     #  Don't allow duplication#  
      
     if (defined $Dispatcher{$RequestName}) {  
  die "Attempting to define a duplicate request handler for $RequestName\n";  
     }  
     #   Build the client type mask:  
       
     my $ClientTypeMask = 0;  
     if($ClientOk) {  
  $ClientTypeMask  |= $CLIENT_OK;  
     }  
     if($ManagerOk) {  
  $ClientTypeMask  |= $MANAGER_OK;  
     }  
      
     #  Enter the hash:  
         
     my @entry = ($Procedure, $MustEncode, $ClientTypeMask);  
      
     $Dispatcher{$RequestName} = \@entry;  
      
      
 }  
   
 #--------------------- Request Handlers --------------------------------------------  
 #  
 #   By convention each request handler registers itself prior to the sub declaration:  
 #  
   
 #  Handles ping requests.  
 #  Parameters:  
 #      $cmd    - the actual keyword that invoked us.  
 #      $tail   - the tail of the request that invoked us.  
 #      $replyfd- File descriptor connected to the client  
 #  Implicit Inputs:  
 #      $currenthostid - Global variable that carries the name of the host we are  
 #                       known as.  
 #  Returns:  
 #      1       - Ok to continue processing.  
 #      0       - Program should exit.  
 #  Side effects:  
 #      Reply information is sent to the client.  
   
 sub PingHandler {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
      
     Reply( $client,"$currenthostid\n","$cmd:$tail");  
      
     return 1;  
 }  
 RegisterHandler("ping", \&PingHandler, 0, 1, 1);       # Ping unencoded, client or manager.  
 #  
 # Handles pong reequests:  
 # Parameters:  
 #      $cmd    - the actual keyword that invoked us.  
 #      $tail   - the tail of the request that invoked us.  
 #      $replyfd- File descriptor connected to the client  
 #  Implicit Inputs:  
 #      $currenthostid - Global variable that carries the name of the host we are  
 #                       connected to.  
 #  Returns:  
 #      1       - Ok to continue processing.  
 #      0       - Program should exit.  
 #  Side effects:  
 #      Reply information is sent to the client.  
   
 sub PongHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $replyfd = shift;  
   
     my $reply=&reply("ping",$clientname);  
     Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");   
     return 1;  
 }  
 RegisterHandler("pong", \&PongHandler, 0, 1, 1);       # Pong unencoded, client or manager  
   
 #  
 #   EstablishKeyHandler:  
 #      Called to establish an encrypted session key with the remote client.  
 #  
 # Parameters:  
 #      $cmd    - the actual keyword that invoked us.  
 #      $tail   - the tail of the request that invoked us.  
 #      $replyfd- File descriptor connected to the client  
 #  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.  
 #  Returns:  
 #      1       - Ok to continue processing.  
 #      0       - Program should exit.  
 #  Implicit Outputs:  
 #      Reply information is sent to the client.  
 #      $cipher is set with a reference to a new IDEA encryption object.  
 #  
 sub EstablishKeyHandler {  
     my $cmd      = shift;  
     my $tail     = shift;  
     my $replyfd  = shift;  
   
     my $buildkey=time.$$.int(rand 100000);  
     $buildkey=~tr/1-6/A-F/;  
     $buildkey=int(rand 100000).$buildkey.int(rand 100000);  
     my $key=$currenthostid.$clientname;  
     $key=~tr/a-z/A-Z/;  
     $key=~tr/G-P/0-9/;  
     $key=~tr/Q-Z/0-9/;  
     $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;  
     $key=substr($key,0,32);  
     my $cipherkey=pack("H32",$key);  
     $cipher=new IDEA $cipherkey;  
     Reply($replyfd, "$buildkey\n", "$cmd:$tail");   
      
     return 1;  
   
 }  
 RegisterHandler("ekey", \&EstablishKeyHandler, 0, 1,1);  
   
 #  LoadHandler:  
 #     Handler for the load command.  Returns the current system load average  
 #     to the requestor.  
 #  
 # Parameters:  
 #      $cmd    - the actual keyword that invoked us.  
 #      $tail   - the tail of the request that invoked us.  
 #      $replyfd- File descriptor connected to the client  
 #  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.  
 #  Returns:  
 #      1       - Ok to continue processing.  
 #      0       - Program should exit.  
 #  Side effects:  
 #      Reply information is sent to the client.  
 sub LoadHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $replyfd = shift;  
   
    # 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  
   
     my $loadavg;  
     my $loadfile=IO::File->new('/proc/loadavg');  
      
     $loadavg=<$loadfile>;  
     $loadavg =~ s/\s.*//g;                      # Extract the first field only.  
      
     my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};  
   
     Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");  
      
     return 1;  
 }  
 RegisterHandler("load", \&LoadHandler, 0, 1, 0);  
   
   
 #  
 #   Process the userload request.  This sub returns to the client the current  
 #  user load average.  It can be invoked either by clients or managers.  
 #  
 # Parameters:  
 #      $cmd    - the actual keyword that invoked us.  
 #      $tail   - the tail of the request that invoked us.  
 #      $replyfd- File descriptor connected to the client  
 #  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.  
 #  Returns:  
 #      1       - Ok to continue processing.  
 #      0       - Program should exit  
 # Implicit inputs:  
 #     whatever the userload() function requires.  
 #  Implicit outputs:  
 #     the reply is written to the client.  
 #  
 sub UserLoadHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $replyfd = shift;  
   
     my $userloadpercent=&userload();  
     Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");  
       
     return 1;  
 }  
 RegisterHandler("userload", \&UserLoadHandler, 0, 1, 0);  
   
 #   Process a request for the authorization type of a user:  
 #   (userauth).  
 #  
 # Parameters:  
 #      $cmd    - the actual keyword that invoked us.  
 #      $tail   - the tail of the request that invoked us.  
 #      $replyfd- File descriptor connected to the client  
 #  Returns:  
 #      1       - Ok to continue processing.  
 #      0       - Program should exit  
 # Implicit outputs:  
 #    The user authorization type is written to the client.  
 #  
 sub UserAuthorizationType {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $replyfd = shift;  
      
     my $userinput = "$cmd:$tail";  
      
     #  Pull the domain and username out of the command tail.  
     # and call GetAuthType to determine the authentication type.  
      
     my ($udom,$uname)=split(/:/,$tail);  
     my $result = GetAuthType($udom, $uname);  
     if($result eq "nouser") {  
  Failure( $replyfd, "unknown_user\n", $userinput);  
     } else {  
  #  
  # We only want to pass the second field from GetAuthType  
  # for ^krb.. otherwise we'll be handing out the encrypted  
  # password for internals e.g.  
  #  
  my ($type,$otherinfo) = split(/:/,$result);  
  if($type =~ /^krb/) {  
     $type = $result;  
  }  
  Reply( $replyfd, "$type\n", $userinput);  
     }  
     
     return 1;  
 }  
 RegisterHandler("currentauth", \&UserAuthorizationType, 1, 1, 0);  
 #  
 #   Process a request by a manager to push a hosts or domain table   
 #   to us.  We pick apart the command and pass it on to the subs  
 #   that already exist to do this.  
 #  
 # Parameters:  
 #      $cmd    - the actual keyword that invoked us.  
 #      $tail   - the tail of the request that invoked us.  
 #      $client - File descriptor connected to the client  
 #  Returns:  
 #      1       - Ok to continue processing.  
 #      0       - Program should exit  
 # Implicit Output:  
 #    a reply is written to the client.  
   
 sub PushFileHandler {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     # At this time we only know that the IP of our partner is a valid manager  
     # the code below is a hook to do further authentication (e.g. to resolve  
     # spoofing).  
   
     my $cert = GetCertificate($userinput);  
     if(ValidManager($cert)) {   
   
  # Now presumably we have the bona fides of both the peer host and the  
  # process making the request.  
         
  my $reply = PushFile($userinput);  
  Reply($client, "$reply\n", $userinput);  
   
     } else {  
  Failure( $client, "refused\n", $userinput);  
     }   
 }  
 RegisterHandler("pushfile", \&PushFileHandler, 1, 0, 1);  
   
   
   
 #   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.  
 #  
 # Parameters:  
 #      $cmd    - the actual keyword that invoked us.  
 #      $tail   - the tail of the request that invoked us.  
 #      $client - File descriptor connected to the client  
 #  Returns:  
 #      1       - Ok to continue processing.  
 #      0       - Program should exit  
 #  Implicit output:  
 #     a reply is sent to the client.  
 #  
 sub ReinitProcessHandler {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
      
     my $userinput = "$cmd:$tail";  
      
     my $cert = GetCertificate($userinput);  
     if(ValidManager($cert)) {  
  chomp($userinput);  
  my $reply = ReinitProcess($userinput);  
  Reply( $client,  "$reply\n", $userinput);  
     } else {  
  Failure( $client, "refused\n", $userinput);  
     }  
     return 1;  
 }  
   
 RegisterHandler("reinit", \&ReinitProcessHandler, 1, 0, 1);  
   
 #  Process the editing script for a table edit operation.  
 #  the editing operation must be encrypted and requested by  
 #  a manager host.  
 #  
 # Parameters:  
 #      $cmd    - the actual keyword that invoked us.  
 #      $tail   - the tail of the request that invoked us.  
 #      $client - File descriptor connected to the client  
 #  Returns:  
 #      1       - Ok to continue processing.  
 #      0       - Program should exit  
 #  Implicit output:  
 #     a reply is sent to the client.  
 #  
 sub EditTableHandler {  
     my $command    = shift;  
     my $tail       = shift;  
     my $client     = shift;  
      
     my $userinput = "$command:$tail";  
   
     my $cert = GetCertificate($userinput);  
     if(ValidManager($cert)) {  
  my($filetype, $script) = split(/:/, $tail);  
  if (($filetype eq "hosts") ||   
     ($filetype eq "domain")) {  
     if($script ne "") {  
  Reply($client,              # BUGBUG - EditFile  
       EditFile($userinput), #   could fail.  
       $userinput);  
     } else {  
  Failure($client,"refused\n",$userinput);  
     }  
  } else {  
     Failure($client,"refused\n",$userinput);  
  }  
     } else {  
  Failure($client,"refused\n",$userinput);  
     }  
     return 1;  
 }  
 RegisterHandler("edit", \&EditTableHandler, 1, 0, 1);  
   
   
 #  
 #   Authenticate a user against the LonCAPA authentication  
 #   database.  Note that there are several authentication  
 #   possibilities:  
 #   - unix     - The user can be authenticated against the unix  
 #                password file.  
 #   - internal - The user can be authenticated against a purely   
 #                internal per user password file.  
 #   - kerberos - The user can be authenticated against either a kerb4 or kerb5  
 #                ticket granting authority.  
 #   - user     - The person tailoring LonCAPA can supply a user authentication  
 #                mechanism that is per system.  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 # Implicit inputs:  
 #    The authentication systems describe above have their own forms of implicit  
 #    input into the authentication process that are described above.  
 #  
 sub AuthenticateHandler {  
     my $cmd        = shift;  
     my $tail       = shift;  
     my $client     = shift;  
       
     #  Regenerate the full input line   
       
     my $userinput  = $cmd.":".$tail;  
       
     #  udom    - User's domain.  
     #  uname   - Username.  
     #  upass   - User's password.  
       
     my ($udom,$uname,$upass)=split(/:/,$tail);  
     Debug(" Authenticate domain = $udom, user = $uname, password = $upass");  
     chomp($upass);  
     $upass=unescape($upass);  
   
     my $pwdcorrect = ValidateUser($udom, $uname, $upass);  
     if($pwdcorrect) {  
  Reply( $client, "authorized\n", $userinput);  
  #  
  #  Bad credentials: Failed to authorize  
  #  
     } else {  
  Failure( $client, "non_authorized\n", $userinput);  
     }  
   
     return 1;  
 }  
 RegisterHandler("auth", \&AuthenticateHandler, 1, 1, 0);  
   
 #  
 #   Change a user's password.  Note that this function is complicated by  
 #   the fact that a user may be authenticated in more than one way:  
 #   At present, we are not able to change the password for all types of  
 #   authentication methods.  Only for:  
 #      unix    - unix password or shadow passoword style authentication.  
 #      local   - Locally written authentication mechanism.  
 #   For now, kerb4 and kerb5 password changes are not supported and result  
 #   in an error.  
 # FUTURE WORK:  
 #    Support kerberos passwd changes?  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 # Implicit inputs:  
 #    The authentication systems describe above have their own forms of implicit  
 #    input into the authentication process that are described above.  
 sub ChangePasswordHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
      
     my $userinput = $cmd.":".$tail;           # Reconstruct client's string.  
   
     #  
     #  udom  - user's domain.  
     #  uname - Username.  
     #  upass - Current password.  
     #  npass - New password.  
      
     my ($udom,$uname,$upass,$npass)=split(/:/,$tail);  
   
     $upass=&unescape($upass);  
     $npass=&unescape($npass);  
     &Debug("Trying to change password for $uname");  
   
     # First require that the user can be authenticated with their  
     # old password:  
   
     my $validated = ValidateUser($udom, $uname, $upass);  
     if($validated) {  
  my $realpasswd  = GetAuthType($udom, $uname); # Defined since authd.  
   
  my ($howpwd,$contentpwd)=split(/:/,$realpasswd);  
  if ($howpwd eq 'internal') {  
     &Debug("internal auth");  
     my $salt=time;  
     $salt=substr($salt,6,2);  
     my $ncpass=crypt($npass,$salt);  
     if(RewritePwFile($udom, $uname, "internal:$ncpass")) {  
  &logthis("Result of password change for "  
  ."$uname: pwchange_success");  
  Reply($client, "ok\n", $userinput);  
     } else {  
  &logthis("Unable to open $uname passwd "                 
  ."to change password");  
  Failure( $client, "non_authorized\n",$userinput);  
     }  
  } elsif ($howpwd eq 'unix') {  
     # Unix means we have to access /etc/password  
     &Debug("auth is unix");  
     my $execdir=$perlvar{'lonDaemons'};  
     &Debug("Opening lcpasswd pipeline");  
     my $pf = IO::File->new("|$execdir/lcpasswd > "  
    ."$perlvar{'lonDaemons'}"  
    ."/logs/lcpasswd.log");  
     print $pf "$uname\n$npass\n$npass\n";  
     close $pf;  
     my $err = $?;  
     my $result = ($err>0 ? 'pwchange_failure' : 'ok');  
     &logthis("Result of password change for $uname: ".  
      &lcpasswdstrerror($?));  
     Reply($client, "$result\n", $userinput);  
  } else {  
     # this just means that the current password mode is not  
     # one we know how to change (e.g the kerberos auth modes or  
     # locally written auth handler).  
     #  
     Reply( $client, "auth_mode_error\n", $userinput);  
  }    
   
     }  
     else {  
  Reply( $client, "non_authorized\n", $userinput);  
     }  
   
     return 1;  
 }  
 RegisterHandler("passwd", \&ChangePasswordHandler, 1, 1, 0);  
   
 #  
 #   Create a new user.  User in this case means a lon-capa user.  
 #   The user must either already exist in some authentication realm  
 #   like kerberos or the /etc/passwd.  If not, a user completely local to  
 #   this loncapa system is created.  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 # Implicit inputs:  
 #    The authentication systems describe above have their own forms of implicit  
 #    input into the authentication process that are described above.  
 sub AddUserHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
   
     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);  
     my $userinput = $cmd.":".$tail; # Reconstruct the full request line.  
   
     &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);  
   
   
     if($udom eq $currentdomainid) { # Reject new users for other domains...  
   
  my $oldumask=umask(0077);  
  chomp($npass);  
  $npass=&unescape($npass);  
  my $passfilename  = PasswordPath($udom, $uname);  
  &Debug("Password file created will be:".$passfilename);  
  if (-e $passfilename) {  
     Failure( $client, "already_exists\n", $userinput);  
  } else {  
     my @fpparts=split(/\//,$passfilename);  
     my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];  
     my $fperror='';  
     for (my $i=3;$i<= ($#fpparts-1);$i++) {  
  $fpnow.='/'.$fpparts[$i];   
  unless (-e $fpnow) {  
     &logthis("mkdir $fpnow");  
     unless (mkdir($fpnow,0777)) {  
  $fperror="error: ".($!+0)." mkdir failed while attempting "  
     ."makeuser";  
     }  
  }  
     }  
     unless ($fperror) {  
  my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);  
  Reply($client, $result, $userinput);     #BUGBUG - could be fail  
     } else {  
  Failure($client, "$fperror\n", $userinput);  
     }  
  }  
  umask($oldumask);  
     }  else {  
  Failure($client, "not_right_domain\n",  
  $userinput); # Even if we are multihomed.  
       
     }  
     return 1;  
   
 }  
 RegisterHandler("makeuser", \&AddUserHandler, 1, 1, 0);  
   
 #  
 #   Change the authentication method of a user.  Note that this may  
 #   also implicitly change the user's password if, for example, the user is  
 #   joining an existing authentication realm.  Known authentication realms at  
 #   this time are:  
 #    internal   - Purely internal password file (only loncapa knows this user)  
 #    local      - Institutionally written authentication module.  
 #    unix       - Unix user (/etc/passwd with or without /etc/shadow).  
 #    kerb4      - kerberos version 4  
 #    kerb5      - kerberos version 5  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 # Implicit inputs:  
 #    The authentication systems describe above have their own forms of implicit  
 #    input into the authentication process that are described above.  
 #  
 sub ChangeAuthenticationHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
      
     my $userinput  = "$cmd:$tail";              # Reconstruct user input.  
   
     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);  
     &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);  
     if ($udom ne $currentdomainid) {  
  Failure( $client, "not_right_domain\n", $client);  
     } else {  
   
  chomp($npass);  
   
  $npass=&unescape($npass);  
  my $passfilename = PasswordPath($udom, $uname);  
  if ($passfilename) { # Not allowed to create a new user!!  
     my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);  
     Reply($client, $result, $userinput);  
  } else {         
     Failure($client, "non_authorized", $userinput); # Fail the user now.  
  }  
     }  
     return 1;  
 }  
 RegisterHandler("changeuserauth", \&ChangeAuthenticationHandler, 1,1, 0);  
   
 #  
 #   Determines if this is the home server for a user.  The home server  
 #   for a user will have his/her lon-capa passwd file.  Therefore all we need  
 #   to do is determine if this file exists.  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 # Implicit inputs:  
 #    The authentication systems describe above have their own forms of implicit  
 #    input into the authentication process that are described above.  
 #  
 sub IsHomeHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
      
     my $userinput  = "$cmd:$tail";  
      
     my ($udom,$uname)=split(/:/,$tail);  
     chomp($uname);  
     my $passfile = PasswordFilename($udom, $uname);  
     if($passfile) {  
  Reply( $client, "found\n", $userinput);  
     } else {  
  Failure($client, "not_found\n", $userinput);  
     }  
     return 1;  
 }  
 RegisterHandler("home", \&IsHomeHandler, 0,1,0);  
 #  
 #   Process an update request for a resource?? I think what's going on here is  
 #   that a resource has been modified that we hold a subscription to.  
 #   If the resource is not local, then we must update, or at least invalidate our  
 #   cached copy of the resource.   
 #   FUTURE WORK:  
 #      I need to look at this logic carefully.  My druthers would be to follow  
 #      typical caching logic, and simple invalidate the cache, drop any subscription  
 #      an let the next fetch start the ball rolling again... however that may  
 #      actually be more difficult than it looks given the complex web of  
 #      proxy servers.  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 # Implicit inputs:  
 #    The authentication systems describe above have their own forms of implicit  
 #    input into the authentication process that are described above.  
 #  
 sub UpdateResourceHandler {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
      
     my $userinput = "$cmd:$tail";  
      
     my $fname= $tail; # This allows interactive testing  
   
   
     my $ownership=ishome($fname);  
     if ($ownership eq 'not_owner') {  
  if (-e $fname) {  
     my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,  
  $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);  
     my $now=time;  
     my $since=$now-$atime;  
     if ($since>$perlvar{'lonExpire'}) {  
  my $reply=&reply("unsub:$fname","$clientname");  
  unlink("$fname");  
     } else {  
  my $transname="$fname.in.transfer";  
  my $remoteurl=&reply("sub:$fname","$clientname");  
  my $response;  
  alarm(120);  
  {  
     my $ua=new LWP::UserAgent;  
     my $request=new HTTP::Request('GET',"$remoteurl");  
     $response=$ua->request($request,$transname);  
  }  
  alarm(0);  
  if ($response->is_error()) {  
     unlink($transname);  
     my $message=$response->status_line;  
     &logthis("LWP GET: $message for $fname ($remoteurl)");  
  } else {  
     if ($remoteurl!~/\.meta$/) {  
  alarm(120);  
  {  
     my $ua=new LWP::UserAgent;  
     my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');  
     my $mresponse=$ua->request($mrequest,$fname.'.meta');  
     if ($mresponse->is_error()) {  
  unlink($fname.'.meta');  
     }  
  }  
  alarm(0);  
     }  
     rename($transname,$fname);  
  }  
     }  
     Reply( $client, "ok\n", $userinput);  
  } else {  
     Failure($client, "not_found\n", $userinput);  
  }  
     } else {  
  Failure($client, "rejected\n", $userinput);  
     }  
     return 1;  
 }  
 RegisterHandler("update", \&UpdateResourceHandler, 0 ,1, 0);  
   
 #  
 #   Fetch a user file from a remote server:  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 #  
 sub FetchUserFileHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
      
     my $userinput = "$cmd:$tail";  
     my $fname           = $tail;  
     my ($udom,$uname,$ufile)=split(/\//,$fname);  
     my $udir=propath($udom,$uname).'/userfiles';  
     unless (-e $udir) {  
  mkdir($udir,0770);   
     }  
     if (-e $udir) {  
  $ufile=~s/^[\.\~]+//;  
  $ufile=~s/\///g;  
  my $destname=$udir.'/'.$ufile;  
  my $transname=$udir.'/'.$ufile.'.in.transit';  
  my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;  
  my $response;  
  alarm(120);  
  {  
     my $ua=new LWP::UserAgent;  
     my $request=new HTTP::Request('GET',"$remoteurl");  
     $response=$ua->request($request,$transname);  
  }  
  alarm(0);  
  if ($response->is_error()) {  
     unlink($transname);  
     my $message=$response->status_line;  
     &logthis("LWP GET: $message for $fname ($remoteurl)");  
     Failure($client, "failed\n", $userinput);  
  } else {  
     if (!rename($transname,$destname)) {  
  &logthis("Unable to move $transname to $destname");  
  unlink($transname);  
  Failure($client, "failed\n", $userinput);  
     } else {  
  Reply($client, "ok\n", $userinput);  
     }  
  }     
     } else {  
  Failure($client, "not_home\n", $userinput);  
     }  
     return 1;  
 }  
 RegisterHandler("fetchuserfile", \&FetchUserFileHandler, 0, 1, 0);  
 #  
 #   Authenticate access to a user file.   
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 sub AuthenticateUserFileAccess {  
     my $cmd       = shift;  
     my $tail      = shift;  
     my $client    = shift;  
     my $userinput = "$cmd:$tail";  
   
     my ($fname,$session)=split(/:/,$tail);  
     chomp($session);  
     my $reply='non_auth';  
     if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.$session.'.id')) {  
  while (my $line=<ENVIN>) {  
     if ($line=~/userfile\.$fname\=/) {   
  $reply='ok';   
     }  
  }  
  close(ENVIN);  
  Reply($client, $reply."\n", $userinput);  
     } else {  
  Failure($client, "invalid_token\n", $userinput);  
     }  
     return 1;  
      
 }  
 RegisterHandler("tokenauthuserfile", \&AuthenticateUserFileAccess, 0, 1, 0);  
 #  
 #   Unsubscribe from a resource.  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 #  
 sub UnsubscribeHandler {  
     my $cmd      = shift;  
     my $tail     = shift;  
     my $client   = shift;  
     my $userinput= "$cmd:$tail";  
       
     my ($fname) = $tail;  
   
     Debug("Unsubscribing $fname");  
     if (-e $fname) {  
  Debug("Exists");  
  Reply($client, &unsub($fname,$clientip), $userinput);  
     } else {  
  Failure($client, "not_found\n", $userinput);  
     }  
     return 1;  
 }  
 RegisterHandler("unsub", \&UnsubscribeHandler, 0, 1, 0);  
   
 #   Subscribe to a resource  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 #  
 sub SubscribeHandler {  
     my $cmd        = shift;  
     my $tail       = shift;  
     my $client     = shift;  
     my $userinput  = "$cmd:$tail";  
   
     Reply( $client, &subscribe($userinput,$clientip), $userinput);  
   
     return 1;  
 }  
 RegisterHandler("sub", \&SubscribeHandler, 0, 1, 0);  
   
 #  
 #   Determine the version of a resource (?) Or is it return  
 #   the top version of the resource?  Not yet clear from the  
 #   code in currentversion.  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 #  
 sub CurrentVersionHandler {  
     my $cmd      = shift;  
     my $tail     = shift;  
     my $client   = shift;  
     my $userinput= "$cmd:$tail";  
      
     my $fname   = $tail;  
     Reply( $client, &currentversion($fname)."\n", $userinput);  
     return 1;  
   
 }  
 RegisterHandler("currentversion", \&CurrentVersionHandler, 0, 1, 0);  
   
   
 #  Make an entry in a user's activity log.  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 #  
 sub ActivityLogEntryHandler {  
     my $cmd      = shift;  
     my $tail     = shift;  
     my $client   = shift;  
     my $userinput= "$cmd:$tail";  
   
     my ($udom,$uname,$what)=split(/:/,$tail);  
     chomp($what);  
     my $proname=propath($udom,$uname);  
     my $now=time;  
     my $hfh;  
     if ($hfh=IO::File->new(">>$proname/activity.log")) {   
  print $hfh "$now:$clientname:$what\n";  
  Reply( $client, "ok\n", $userinput);   
     } else {  
  Failure($client, "error: ".($!+0)." IO::File->new Failed "  
       ."while attempting log\n",   
       $userinput);  
     }  
   
     return 1;  
 }  
 RegisterHandler("log", \&ActivityLogEntryHandler, 0, 1, 0);  
 #  
 #   Put a namespace entry in a user profile hash.  
 #   My druthers would be for this to be an encrypted interaction too.  
 #   anything that might be an inadvertent covert channel about either  
 #   user authentication or user personal information....  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 #  
 sub PutUserProfileEntry {  
     my $cmd       = shift;  
     my $tail      = shift;  
     my $client    = shift;  
     my $userinput = "$cmd:$tail";  
       
     my ($udom,$uname,$namespace,$what) =split(/:/,$tail);  
     if ($namespace ne 'roles') {  
  chomp($what);  
  my $hashref = TieUserHash($udom, $uname, $namespace,  
   &GDBM_WRCREAT(),"P",$what);  
  if($hashref) {  
     my @pairs=split(/\&/,$what);  
     foreach my $pair (@pairs) {  
  my ($key,$value)=split(/=/,$pair);  
  $hashref->{$key}=$value;  
     }  
     if (untie(%$hashref)) {  
  Reply( $client, "ok\n", $userinput);  
     } else {  
  Failure($client, "error: ".($!+0)." untie(GDBM) failed ".  
  "while attempting put\n",   
  $userinput);  
     }  
  } else {  
     Failure( $client, "error: ".($!)." tie(GDBM) Failed ".  
      "while attempting put\n", $userinput);  
  }  
     } else {  
         Failure( $client, "refused\n", $userinput);  
     }  
       
     return 1;  
 }  
 RegisterHandler("put", \&PutUserProfileEntry, 0, 1, 0);  
   
 #   
 #   Increment a profile entry in the user history file.  
 #   The history contains keyword value pairs.  In this case,  
 #   The value itself is a pair of numbers.  The first, the current value  
 #   the second an increment that this function applies to the current  
 #   value.  
 #  
 # Parameters:  
 #    $cmd      - The command that got us here.  
 #    $tail     - Tail of the command (remaining parameters).  
 #    $client   - File descriptor connected to client.  
 # Returns  
 #     0        - Requested to exit, caller should shut down.  
 #     1        - Continue processing.  
 #  
 sub IncrementUserValueHandler {  
     my $cmd         = shift;  
     my $tail        = shift;  
     my $client      = shift;  
     my $userinput   = "$cmd:$tail";  
   
     my ($udom,$uname,$namespace,$what) =split(/:/,$tail);  
     if ($namespace ne 'roles') {  
         chomp($what);  
  my $hashref = TieUserHash($udom, $uname,  
   $namespace, &GDBM_WRCREAT(),  
   "P",$what);  
  if ($hashref) {  
     my @pairs=split(/\&/,$what);  
     foreach my $pair (@pairs) {  
  my ($key,$value)=split(/=/,$pair);  
  # We could check that we have a number...  
  if (! defined($value) || $value eq '') {  
     $value = 1;  
  }  
  $hashref->{$key}+=$value;  
     }  
     if (untie(%$hashref)) {  
  Reply( $client, "ok\n", $userinput);  
     } else {  
  Failure($client, "error: ".($!+0)." untie(GDBM) failed ".  
  "while attempting inc\n", $userinput);  
     }  
  } else {  
     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
     "while attempting inc\n", $userinput);  
  }  
     } else {  
  Failure($client, "refused\n", $userinput);  
     }  
       
     return 1;  
 }  
 RegisterHandler("inc", \&IncrementUserValueHandler, 0, 1, 0);  
 #  
 #   Put a new role for a user.  Roles are LonCAPA's packaging of permissions.  
 #   Each 'role' a user has implies a set of permissions.  Adding a new role  
 #   for a person grants the permissions packaged with that role  
 #   to that user when the role is selected.  
 #  
 # Parameters:  
 #    $cmd       - The command string (rolesput).  
 #    $tail      - The remainder of the request line.  For rolesput this  
 #                 consists of a colon separated list that contains:  
 #                 The domain and user that is granting the role (logged).  
 #                 The domain and user that is getting the role.  
 #                 The roles being granted as a set of & separated pairs.  
 #                 each pair a key value pair.  
 #    $client    - File descriptor connected to the client.  
 # Returns:  
 #     0         - If the daemon should exit  
 #     1         - To continue processing.  
 #  
 #  
 sub RolesPutHandler {  
     my $cmd        = shift;  
     my $tail       = shift;  
     my $client     = shift;  
     my $userinput  = "$cmd:$tail";  
   
     my ( $exedom, $exeuser, $udom, $uname,  $what) = split(/:/,$tail);  
       
   
     my $namespace='roles';  
     chomp($what);  
     my $hashref = TieUserHash($udom, $uname, $namespace,  
       &GDBM_WRCREAT(), "P",  
       "$exedom:$exeuser:$what");  
     #  
     #  Log the attempt to set a role.  The {}'s here ensure that the file   
     #  handle is open for the minimal amount of time.  Since the flush  
     #  is done on close this improves the chances the log will be an un-  
     #  corrupted ordered thing.  
     if ($hashref) {  
  my @pairs=split(/\&/,$what);  
  foreach my $pair (@pairs) {  
     my ($key,$value)=split(/=/,$pair);  
     &ManagePermissions($key, $udom, $uname,  
        &GetAuthType( $udom, $uname));  
     $hashref->{$key}=$value;  
  }  
  if (untie($hashref)) {  
     Reply($client, "ok\n", $userinput);  
  } else {  
     Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".  
      "while attempting rolesput\n", $userinput);  
  }  
     } else {  
  Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".  
  "while attempting rolesput\n", $userinput);  
     }  
     return 1;  
 }  
 RegisterHandler("rolesput", \&RolesPutHandler, 1,1,0);  # Encoded client only.  
 #  
 #   Deletes (removes) a role for a user.   This is equivalent to removing  
 #  a permissions package associated with the role from the user's profile.  
 #  
 # Parameters:  
 #     $cmd                 - The command (rolesdel)  
 #     $tail                - The remainder of the request line. This consists  
 #                             of:  
 #                             The domain and user requesting the change (logged)  
 #                             The domain and user being changed.  
 #                             The roles being revoked.  These are shipped to us  
 #                             as a bunch of & separated role name keywords.  
 #     $client              - The file handle open on the client.  
 # Returns:  
 #     1                    - Continue processing  
 #     0                    - Exit.  
 #  
 sub RolesDeleteHandler {  
     my $cmd          = shift;  
     my $tail         = shift;  
     my $client       = shift;  
     my $userinput    = "$cmd:$tail";  
      
     my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);  
     &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.  
    "what = ".$what);  
     my $namespace='roles';  
     chomp($what);  
     my $hashref = TieUserHash($udom, $uname, $namespace,  
       &GDBM_WRCREAT(), "D",  
       "$exedom:$exeuser:$what");  
       
     if ($hashref) {  
  my @rolekeys=split(/\&/,$what);  
   
  foreach my $key (@rolekeys) {  
     delete $hashref->{$key};  
  }  
  if (untie(%$hashref)) {  
     Reply($client, "ok\n", $userinput);  
  } else {  
     Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".  
      "while attempting rolesdel\n", $userinput);  
  }  
     } else {  
         Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".  
  "while attempting rolesdel\n", $userinput);  
     }  
       
     return 1;  
 }  
 RegisterHandler("rolesdel", \&RolesDeleteHandler, 1,1, 0); # Encoded client only  
   
 # Unencrypted get from a user's profile database.  See   
 # GetProfileEntryEncrypted for a version that does end-to-end encryption.  
 # This function retrieves a keyed item from a specific named database in the  
 # user's directory.  
 #  
 # Parameters:  
 #   $cmd             - Command request keyword (get).  
 #   $tail            - Tail of the command.  This is a colon separated list  
 #                      consisting of the domain and username that uniquely  
 #                      identifies the profile,  
 #                      The 'namespace' which selects the gdbm file to   
 #                      do the lookup in,   
 #                      & separated list of keys to lookup.  Note that  
 #                      the values are returned as an & separated list too.  
 #   $client          - File descriptor open on the client.  
 # Returns:  
 #   1       - Continue processing.  
 #   0       - Exit.  
 #  
 sub GetProfileEntry {  
     my $cmd      = shift;  
     my $tail     = shift;  
     my $client   = shift;  
     my $userinput= "$cmd:$tail";  
      
     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);  
     chomp($what);  
     my $hashref = TieUserHash($udom, $uname, $namespace,  
       &GDBM_READER());  
     if ($hashref) {  
         my @queries=split(/\&/,$what);  
         my $qresult='';  
   
  for (my $i=0;$i<=$#queries;$i++) {  
     $qresult.="$hashref->{$queries[$i]}&";    # Presumably failure gives empty string.  
  }  
  $qresult=~s/\&$//;              # Remove trailing & from last lookup.  
  if (untie(%$hashref)) {  
     Reply($client, "$qresult\n", $userinput);  
  } else {  
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  
     "while attempting get\n", $userinput);  
  }  
     } else {  
  if ($!+0 == 2) {               # +0 coerces errno -> number 2 is ENOENT  
     Failure($client, "error:No such file or ".  
     "GDBM reported bad block error\n", $userinput);  
  } else {                        # Some other undifferentiated err.  
     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
     "while attempting get\n", $userinput);  
  }  
     }  
     return 1;  
 }  
 RegisterHandler("get", \&GetProfileEntry, 0,1,0);  
 #  
 #  Process the encrypted get request.  Note that the request is sent  
 #  in clear, but the reply is encrypted.  This is a small covert channel:  
 #  information about the sensitive keys is given to the snooper.  Just not  
 #  information about the values of the sensitive key.  Hmm if I wanted to  
 #  know these I'd snoop for the egets. Get the profile item names from them  
 #  and then issue a get for them since there's no enforcement of the  
 #  requirement of an encrypted get for particular profile items.  If I  
 #  were re-doing this, I'd force the request to be encrypted as well as the  
 #  reply.  I'd also just enforce encrypted transactions for all gets since  
 #  that would prevent any covert channel snooping.  
 #  
 #  Parameters:  
 #     $cmd               - Command keyword of request (eget).  
 #     $tail              - Tail of the command.  See GetProfileEntry #                          for more information about this.  
 #     $client            - File open on the client.  
 #  Returns:  
 #     1      - Continue processing  
 #     0      - server should exit.  
 sub GetProfileEntryEncrypted {  
     my $cmd       = shift;  
     my $tail      = shift;  
     my $client    = shift;  
     my $userinput = "$cmd:$tail";  
      
     my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);  
     chomp($what);  
     my $hashref = TieUserHash($udom, $uname, $namespace,  
   &GDBM_READER());  
     if ($hashref) {  
         my @queries=split(/\&/,$what);  
         my $qresult='';  
  for (my $i=0;$i<=$#queries;$i++) {  
     $qresult.="$hashref->{$queries[$i]}&";  
  }  
  if (untie(%$hashref)) {  
     $qresult=~s/\&$//;  
     if ($cipher) {  
  my $cmdlength=length($qresult);  
  $qresult.="         ";  
  my $encqresult='';  
  for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {  
     $encqresult.= unpack("H16",   
  $cipher->encrypt(substr($qresult,  
  $encidx,  
  8)));  
  }  
  Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);  
     } else {  
  Failure( $client, "error:no_key\n", $userinput);  
     }  
  } else {  
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  
     "while attempting eget\n", $userinput);  
  }  
     } else {  
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
  "while attempting eget\n", $userinput);  
     }  
       
     return 1;  
 }  
 RegisterHandler("eget", \&GetProfileEntryEncrypted, 0, 1, 0);  
   
 #  
 #   Deletes a key in a user profile database.  
 #     
 #   Parameters:  
 #       $cmd                  - Command keyword (del).  
 #       $tail                 - Command tail.  IN this case a colon  
 #                               separated list containing:  
 #                               The domain and user that identifies uniquely  
 #                               the identity of the user.  
 #                               The profile namespace (name of the profile  
 #                               database file).  
 #                               & separated list of keywords to delete.  
 #       $client              - File open on client socket.  
 # Returns:  
 #     1   - Continue processing  
 #     0   - Exit server.  
 #  
 #  
   
 sub DeleteProfileEntry {  
     my $cmd      = shift;  
     my $tail     = shift;  
     my $client   = shift;  
     my $userinput = "cmd:$tail";  
   
     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);  
     chomp($what);  
     my $hashref = TieUserHash($udom, $uname, $namespace,  
   &GDBM_WRCREAT(),  
   "D",$what);  
     if ($hashref) {  
         my @keys=split(/\&/,$what);  
  foreach my $key (@keys) {  
     delete($hashref->{$key});  
  }  
  if (untie(%$hashref)) {  
     Reply($client, "ok\n", $userinput);  
  } else {  
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  
     "while attempting del\n", $userinput);  
  }  
     } else {  
  Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".  
  "while attempting del\n", $userinput);  
     }  
     return 1;  
 }  
 RegisterHandler("del", \&DeleteProfileEntry, 0, 1, 0);  
 #  
 #  List the set of keys that are defined in a profile database file.  
 #  A successful reply from this will contain an & separated list of  
 #  the keys.   
 # Parameters:  
 #     $cmd              - Command request (keys).  
 #     $tail             - Remainder of the request, a colon separated  
 #                         list containing domain/user that identifies the  
 #                         user being queried, and the database namespace  
 #                         (database filename essentially).  
 #     $client           - File open on the client.  
 #  Returns:  
 #    1    - Continue processing.  
 #    0    - Exit the server.  
 #  
 sub GetProfileKeys {  
     my $cmd       = shift;  
     my $tail      = shift;  
     my $client    = shift;  
     my $userinput = "$cmd:$tail";  
   
     my ($udom,$uname,$namespace)=split(/:/,$tail);  
     my $qresult='';  
     my $hashref = TieUserHash($udom, $uname, $namespace,  
   &GDBM_READER());  
     if ($hashref) {  
  foreach my $key (keys %$hashref) {  
     $qresult.="$key&";  
  }  
  if (untie(%$hashref)) {  
     $qresult=~s/\&$//;  
     Reply($client, "$qresult\n", $userinput);  
  } else {  
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  
     "while attempting keys\n", $userinput);  
  }  
     } else {  
  Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".  
  "while attempting keys\n", $userinput);  
     }  
      
     return 1;  
 }  
 RegisterHandler("keys", \&GetProfileKeys, 0, 1, 0);  
 #  
 #   Dump the contents of a user profile database.  
 #   Note that this constitutes a very large covert channel too since  
 #   the dump will return sensitive information that is not encrypted.  
 #   The naive security assumption is that the session negotiation ensures  
 #   our client is trusted and I don't believe that's assured at present.  
 #   Sure want badly to go to ssl or tls.  Of course if my peer isn't really  
 #   a LonCAPA node they could have negotiated an encryption key too so >sigh<.  
 #   
 #  Parameters:  
 #     $cmd           - The command request keyword (currentdump).  
 #     $tail          - Remainder of the request, consisting of a colon  
 #                      separated list that has the domain/username and  
 #                      the namespace to dump (database file).  
 #     $client        - file open on the remote client.  
 # Returns:  
 #     1    - Continue processing.  
 #     0    - Exit the server.  
 #  
 sub DumpProfileDatabase {  
     my $cmd       = shift;  
     my $tail      = shift;  
     my $client    = shift;  
     my $userinput = "$cmd:$tail";  
      
     my ($udom,$uname,$namespace) = split(/:/,$tail);  
     my $hashref = TieUserHash($udom, $uname, $namespace,  
   &GDBM_READER());  
     if ($hashref) {  
  # Structure of %data:  
  # $data{$symb}->{$parameter}=$value;  
  # $data{$symb}->{'v.'.$parameter}=$version;  
  # since $parameter will be unescaped, we do not  
   # have to worry about silly parameter names...  
   
         my $qresult='';  
  my %data = ();                     # A hash of anonymous hashes..  
  while (my ($key,$value) = each(%$hashref)) {  
     my ($v,$symb,$param) = split(/:/,$key);  
     next if ($v eq 'version' || $symb eq 'keys');  
     next if (exists($data{$symb}) &&   
      exists($data{$symb}->{$param}) &&  
      $data{$symb}->{'v.'.$param} > $v);  
     $data{$symb}->{$param}=$value;  
     $data{$symb}->{'v.'.$param}=$v;  
  }  
  if (untie(%$hashref)) {  
     while (my ($symb,$param_hash) = each(%data)) {  
  while(my ($param,$value) = each (%$param_hash)){  
     next if ($param =~ /^v\./);       # Ignore versions...  
     #  
     #   Just dump the symb=value pairs separated by &  
     #  
     $qresult.=$symb.':'.$param.'='.$value.'&';  
  }  
     }  
     chop($qresult);  
     Reply($client , "$qresult\n", $userinput);  
  } else {  
     Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".  
      "while attempting currentdump\n", $userinput);  
  }  
     } else {  
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
  "while attempting currentdump\n", $userinput);  
     }  
   
     return 1;  
 }  
 RegisterHandler("currentdump", \&DumpProfileDatabase, 0, 1, 0);  
 #  
 #   Dump a profile database with an optional regular expression  
 #   to match against the keys.  In this dump, no effort is made  
 #   to separate symb from version information. Presumably the  
 #   databases that are dumped by this command are of a different  
 #   structure.  Need to look at this and improve the documentation of  
 #   both this and the currentdump handler.  
 # Parameters:  
 #    $cmd                     - The command keyword.  
 #    $tail                    - All of the characters after the $cmd:  
 #                               These are expected to be a colon  
 #                               separated list containing:  
 #                               domain/user - identifying the user.  
 #                               namespace   - identifying the database.  
 #                               regexp      - optional regular expression  
 #                                             that is matched against  
 #                                             database keywords to do  
 #                                             selective dumps.  
 #   $client                   - Channel open on the client.  
 # Returns:  
 #    1    - Continue processing.  
 # Side effects:  
 #    response is written to $client.  
 #  
 sub DumpWithRegexp {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);  
     if (defined($regexp)) {  
  $regexp=&unescape($regexp);  
     } else {  
  $regexp='.';  
     }  
     my $hashref =TieUserHash($udom, $uname, $namespace,  
  &GDBM_READER());  
     if ($hashref) {  
         my $qresult='';  
  while (my ($key,$value) = each(%$hashref)) {  
     if ($regexp eq '.') {  
  $qresult.=$key.'='.$value.'&';  
     } else {  
  my $unescapeKey = &unescape($key);  
  if (eval('$unescapeKey=~/$regexp/')) {  
     $qresult.="$key=$value&";  
  }  
     }  
  }  
  if (untie(%$hashref)) {  
     chop($qresult);  
     Reply($client, "$qresult\n", $userinput);  
  } else {  
     Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".  
      "while attempting dump\n", $userinput);  
  }  
     } else {  
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
  "while attempting dump\n", $userinput);  
     }  
   
     return 1;  
 }  
 RegisterHandler("dump", \&DumpWithRegexp, 0, 1, 0);  
   
 #  Store a set of key=value pairs associated with a versioned name.  
 #  
 #  Parameters:  
 #    $cmd                - Request command keyword.  
 #    $tail               - Tail of the request.  This is a colon  
 #                          separated list containing:  
 #                          domain/user - User and authentication domain.  
 #                          namespace   - Name of the database being modified  
 #                          rid         - Resource keyword to modify.  
 #                          what        - new value associated with rid.  
 #  
 #    $client             - Socket open on the client.  
 #  
 #  
 #  Returns:  
 #      1 (keep on processing).  
 #  Side-Effects:  
 #    Writes to the client  
 sub StoreHandler {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
    
     my $userinput = "$cmd:$tail";  
   
     my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);  
     if ($namespace ne 'roles') {  
   
  chomp($what);  
  my @pairs=split(/\&/,$what);  
  my $hashref  = TieUserHash($udom, $uname, $namespace,  
        &GDBM_WRCREAT(), "P",  
        "$rid:$what");  
  if ($hashref) {  
     my $now = time;  
     my @previouskeys=split(/&/,$hashref->{"keys:$rid"});  
     my $key;  
     $hashref->{"version:$rid"}++;  
     my $version=$hashref->{"version:$rid"};  
     my $allkeys='';   
     foreach my $pair (@pairs) {  
  my ($key,$value)=split(/=/,$pair);  
  $allkeys.=$key.':';  
  $hashref->{"$version:$rid:$key"}=$value;  
     }  
     $hashref->{"$version:$rid:timestamp"}=$now;  
     $allkeys.='timestamp';  
     $hashref->{"$version:keys:$rid"}=$allkeys;  
     if (untie($hashref)) {  
  Reply($client, "ok\n", $userinput);  
     } else {  
  Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  
  "while attempting store\n", $userinput);  
     }  
  } else {  
     Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".  
      "while attempting store\n", $userinput);  
  }  
     } else {  
  Failure($client, "refused\n", $userinput);  
     }  
   
     return 1;  
 }  
 RegisterHandler("store", \&StoreHandler, 0, 1, 0);  
 #  
 #  Dump out all versions of a resource that has key=value pairs associated  
 # with it for each version.  These resources are built up via the store  
 # command.  
 #  
 #  Parameters:  
 #     $cmd               - Command keyword.  
 #     $tail              - Remainder of the request which consists of:  
 #                          domain/user   - User and auth. domain.  
 #                          namespace     - name of resource database.  
 #                          rid           - Resource id.  
 #    $client             - socket open on the client.  
 #  
 # Returns:  
 #      1  indicating the caller should not yet exit.  
 # Side-effects:  
 #   Writes a reply to the client.  
 #   The reply is a string of the following shape:  
 #   version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...  
 #    Where the 1 above represents version 1.  
 #    this continues for all pairs of keys in all versions.  
 #  
 #  
 #      
 #  
 sub RestoreHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
   
     my $userinput = "$cmd:$tail"; # Only used for logging purposes.  
   
     my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);  
     $namespace=~s/\//\_/g;  
     $namespace=~s/\W//g;  
     chomp($rid);  
     my $proname=propath($udom,$uname);  
     my $qresult='';  
     my %hash;  
     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",  
     &GDBM_READER(),0640)) {  
  my $version=$hash{"version:$rid"};  
  $qresult.="version=$version&";  
  my $scope;  
  for ($scope=1;$scope<=$version;$scope++) {  
     my $vkeys=$hash{"$scope:keys:$rid"};  
     my @keys=split(/:/,$vkeys);  
     my $key;  
     $qresult.="$scope:keys=$vkeys&";  
     foreach $key (@keys) {  
  $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";  
     }                                    
  }  
  if (untie(%hash)) {  
     $qresult=~s/\&$//;  
     Reply( $client, "$qresult\n", $userinput);  
  } else {  
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  
     "while attempting restore\n", $userinput);  
  }  
     } else {  
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
  "while attempting restore\n", $userinput);  
     }  
     
     return 1;  
   
   
 }  
 RegisterHandler("restore", \&RestoreHandler, 0,1,0);  
   
 #  
 #   Add a chat message to to a discussion board.  
 #  
 # Parameters:  
 #    $cmd                - Request keyword.  
 #    $tail               - Tail of the command. A colon separated list  
 #                          containing:  
 #                          cdom    - Domain on which the chat board lives  
 #                          cnum    - Identifier of the discussion group.  
 #                          post    - Body of the posting.  
 #   $client              - Socket open on the client.  
 # Returns:  
 #   1    - Indicating caller should keep on processing.  
 #  
 # Side-effects:  
 #   writes a reply to the client.  
 #  
 #  
 sub SendChatHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
       
     my $userinput = "$cmd:$tail";  
   
     my ($cdom,$cnum,$newpost)=split(/\:/,$tail);  
     &chatadd($cdom,$cnum,$newpost);  
     Reply($client, "ok\n", $userinput);  
   
     return 1;  
 }  
 RegisterHandler("chatsend", \&SendChatHandler, 0, 1, 0);  
 #  
 #   Retrieve the set of chat messagss from a discussion board.  
 #  
 #  Parameters:  
 #    $cmd             - Command keyword that initiated the request.  
 #    $tail            - Remainder of the request after the command  
 #                       keyword.  In this case a colon separated list of  
 #                       chat domain    - Which discussion board.  
 #                       chat id        - Discussion thread(?)  
 #                       domain/user    - Authentication domain and username  
 #                                        of the requesting person.  
 #   $client           - Socket open on the client program.  
 # Returns:  
 #    1     - continue processing  
 # Side effects:  
 #    Response is written to the client.  
 #  
 sub RetrieveChatHandler {  
     my $cmd      = shift;  
     my $tail     = shift;  
     my $client   = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);  
     my $reply='';  
     foreach (&getchat($cdom,$cnum,$udom,$uname)) {  
  $reply.=&escape($_).':';  
     }  
     $reply=~s/\:$//;  
     Reply($client, $reply."\n", $userinput);  
   
   
     return 1;  
 }  
 RegisterHandler("chatretr", \&RetrieveChatHandler, 0, 1, 0);  
 #  
 #  Initiate a query of an sql database.  SQL query repsonses get put in  
 #  a file for later retrieval.  This prevents sql query results from  
 #  bottlenecking the system.  Note that with loncnew, perhaps this is  
 #  less of an issue since multiple outstanding requests can be concurrently  
 #  serviced.  
 #  
 #  Parameters:  
 #     $cmd       - COmmand keyword that initiated the request.  
 #     $tail      - Remainder of the command after the keyword.  
 #                  For this function, this consists of a query and  
 #                  3 arguments that are self-documentingly labelled  
 #                  in the original arg1, arg2, arg3.  
 #     $client    - Socket open on the client.  
 # Return:  
 #    1   - Indicating processing should continue.  
 # Side-effects:  
 #    a reply is written to $client.  
 #  
 sub SendQueryHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);  
     $query=~s/\n*$//g;  
     Reply($client, "". sqlreply("$clientname\&$query".  
  "\&$arg1"."\&$arg2"."\&$arg3")."\n",  
   $userinput);  
       
     return 1;  
 }  
 RegisterHandler("querysend", \&SendQueryHandler, 0, 1, 0);  
   
 #  
 #   Add a reply to an sql query.  SQL queries are done asyncrhonously.  
 #   The query is submitted via a "querysend" transaction.  
 #   There it is passed on to the lonsql daemon, queued and issued to  
 #   mysql.  
 #     This transaction is invoked when the sql transaction is complete  
 #   it stores the query results in flie and indicates query completion.  
 #   presumably local software then fetches this response... I'm guessing  
 #   the sequence is: lonc does a querysend, we ask lonsql to do it.  
 #   lonsql on completion of the query interacts with the lond of our  
 #   client to do a query reply storing two files:  
 #    - id     - The results of the query.  
 #    - id.end - Indicating the transaction completed.   
 #    NOTE: id is a unique id assigned to the query and querysend time.  
 # Parameters:  
 #    $cmd        - Command keyword that initiated this request.  
 #    $tail       - Remainder of the tail.  In this case that's a colon  
 #                  separated list containing the query Id and the   
 #                  results of the query.  
 #    $client     - Socket open on the client.  
 # Return:  
 #    1           - Indicating that we should continue processing.  
 # Side effects:  
 #    ok written to the client.  
 #  
 sub ReplyQueryHandler {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     my ($cmd,$id,$reply)=split(/:/,$userinput);   
     my $store;  
     my $execdir=$perlvar{'lonDaemons'};  
     if ($store=IO::File->new(">$execdir/tmp/$id")) {  
  $reply=~s/\&/\n/g;  
  print $store $reply;  
  close $store;  
  my $store2=IO::File->new(">$execdir/tmp/$id.end");  
  print $store2 "done\n";  
  close $store2;  
  Reply($client, "ok\n", $userinput);  
     } else {  
  Failure($client, "error: ".($!+0)  
  ." IO::File->new Failed ".  
  "while attempting queryreply\n", $userinput);  
     }  
    
   
     return 1;  
 }  
 RegisterHandler("queryreply", \&ReplyQueryHandler, 0, 1, 0);  
 #  
 #  Process the courseidput query.  Not quite sure what this means  
 #  at the system level sense.  It appears a gdbm file in the   
 #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and  
 #  a set of entries made in that database.  
 #  
 # Parameters:  
 #   $cmd      - The command keyword that initiated this request.  
 #   $tail     - Tail of the command.  In this case consists of a colon  
 #               separated list contaning the domain to apply this to and  
 #               an ampersand separated list of keyword=value pairs.  
 #   $client   - Socket open on the client.  
 # Returns:  
 #   1    - indicating that processing should continue  
 #  
 # Side effects:  
 #   reply is written to the client.  
 #  
 sub PutCourseIdHandler {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     my ($udom, $what) = split(/:/, $tail);  
     chomp($what);  
     my $now=time;  
     my @pairs=split(/\&/,$what);  
   
     my $hashref = TieDomainHash($udom, "nohist_courseids", &GDBM_WRCREAT());  
     if ($hashref) {  
  foreach my $pair (@pairs) {  
     my ($key,$value)=split(/=/,$pair);  
     $hashref->{$key}=$value.':'.$now;  
  }  
  if (untie(%$hashref)) {  
     Reply($client, "ok\n", $userinput);  
  } else {  
     Failure( $client, "error: ".($!+0)  
      ." untie(GDBM) Failed ".  
      "while attempting courseidput\n", $userinput);  
  }  
     } else {  
  Failure( $client, "error: ".($!+0)  
  ." tie(GDBM) Failed ".  
  "while attempting courseidput\n", $userinput);  
     }  
   
     return 1;  
 }  
 RegisterHandler("courseidput", \&PutCourseIdHandler, 0, 1, 0);  
   
 #  Retrieves the value of a course id resource keyword pattern  
 #  defined since a starting date.  Both the starting date and the  
 #  keyword pattern are optional.  If the starting date is not supplied it  
 #  is treated as the beginning of time.  If the pattern is not found,  
 #  it is treatred as "." matching everything.  
 #  
 #  Parameters:  
 #     $cmd     - Command keyword that resulted in us being dispatched.  
 #     $tail    - The remainder of the command that, in this case, consists  
 #                of a colon separated list of:  
 #                 domain   - The domain in which the course database is   
 #                            defined.  
 #                 since    - Optional parameter describing the minimum  
 #                            time of definition(?) of the resources that  
 #                            will match the dump.  
 #                 description - regular expression that is used to filter  
 #                            the dump.  Only keywords matching this regexp  
 #                            will be used.  
 #     $client  - The socket open on the client.  
 # Returns:  
 #    1     - Continue processing.  
 # Side Effects:  
 #   a reply is written to $client.  
 sub DumpCourseIdHandler {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     my ($udom,$since,$description) =split(/:/,$tail);  
     if (defined($description)) {  
  $description=&unescape($description);  
     } else {  
  $description='.';  
     }  
     unless (defined($since)) { $since=0; }  
     my $qresult='';  
     logthis(" Looking for $description  since $since");  
     my $hashref = TieDomainHash($udom, "nohist_courseids", &GDBM_WRCREAT());  
     if ($hashref) {  
  while (my ($key,$value) = each(%$hashref)) {  
     my ($descr,$lasttime)=split(/\:/,$value);  
     logthis("Got:  key = $key descr = $descr time: $lasttime");  
     if ($lasttime<$since) {   
  logthis("Skipping .. too early");  
  next;   
     }  
     if ($description eq '.') {  
  logthis("Adding wildcard match");  
  $qresult.=$key.'='.$descr.'&';  
     } else {  
  my $unescapeVal = &unescape($descr);  
  logthis("Matching with $unescapeVal");  
  if (eval('$unescapeVal=~/\Q$description\E/i')) {  
     logthis("Adding on match");  
     $qresult.="$key=$descr&";  
  }  
     }  
  }  
  if (untie(%$hashref)) {  
     chop($qresult);  
     Reply($client, "$qresult\n", $userinput);  
  } else {  
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  
     "while attempting courseiddump\n", $userinput);  
  }  
     } else {  
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
  "while attempting courseiddump\n", $userinput);  
     }  
   
   
     return 1;  
 }  
 RegisterHandler("courseiddump", \&DumpCourseIdHandler, 0, 1, 0);  
 #  
 #  Puts an id to a domains id database.   
 #  
 #  Parameters:  
 #   $cmd     - The command that triggered us.  
 #   $tail    - Remainder of the request other than the command. This is a   
 #              colon separated list containing:  
 #              $domain  - The domain for which we are writing the id.  
 #              $pairs  - The id info to write... this is and & separated list  
 #                        of keyword=value.  
 #   $client  - Socket open on the client.  
 #  Returns:  
 #    1   - Continue processing.  
 #  Side effects:  
 #     reply is written to $client.  
 #  
 sub PutIdHandler {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     my ($udom,$what)=split(/:/,$tail);  
     chomp($what);  
     my @pairs=split(/\&/,$what);  
     my $hashref = TieDomainHash($udom, "ids", &GDBM_WRCREAT(),  
  "P", $what);  
     if ($hashref) {  
  foreach my $pair (@pairs) {  
     my ($key,$value)=split(/=/,$pair);  
     $hashref->{$key}=$value;  
  }  
  if (untie(%$hashref)) {  
     Reply($client, "ok\n", $userinput);  
  } else {  
     Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".  
     "while attempting idput\n", $userinput);  
  }  
     } else {  
  Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".  
  "while attempting idput\n", $userinput);  
     }  
   
     return 1;  
 }  
   
 RegisterHandler("idput", \&PutIdHandler, 0, 1, 0);  
 #  
 #  Retrieves a set of id values from the id database.  
 #  Returns an & separated list of results, one for each requested id to the  
 #  client.  
 #  
 # Parameters:  
 #   $cmd       - Command keyword that caused us to be dispatched.  
 #   $tail      - Tail of the command.  Consists of a colon separated:  
 #               domain - the domain whose id table we dump  
 #               ids      Consists of an & separated list of  
 #                        id keywords whose values will be fetched.  
 #                        nonexisting keywords will have an empty value.  
 #   $client    - Socket open on the client.  
 #  
 # Returns:  
 #    1 - indicating processing should continue.  
 # Side effects:  
 #   An & separated list of results is written to $client.  
 #  
 sub GetIdHandler {  
     my $cmd    = shift;  
     my $tail   = shift;  
     my $client = shift;  
       
     my $userinput = "$client:$tail";  
       
     my ($udom,$what)=split(/:/,$tail);  
     chomp($what);  
     my @queries=split(/\&/,$what);  
     my $qresult='';  
     my $hashref = TieDomainHash($udom, "ids", &GDBM_READER());  
     if ($hashref) {  
  for (my $i=0;$i<=$#queries;$i++) {  
     $qresult.="$hashref->{$queries[$i]}&";  
  }  
  if (untie(%$hashref)) {  
     $qresult=~s/\&$//;  
     Reply($client, "$qresult\n", $userinput);  
  } else {  
     Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".  
      "while attempting idget\n",$userinput);  
  }  
     } else {  
  Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".  
  "while attempting idget\n",$userinput);  
     }  
       
     return 1;  
 }  
   
 RegisterHandler("idget", \&GetIdHandler, 0, 1, 0);  
 #  
 #  Process the tmpput command I'm not sure what this does.. Seems to  
 #  create a file in the lonDaemons/tmp directory of the form $id.tmp  
 # where Id is the client's ip concatenated with a sequence number.  
 # The file will contain some value that is passed in.  Is this e.g.  
 # a login token?  
 #  
 # Parameters:  
 #    $cmd     - The command that got us dispatched.  
 #    $tail    - The remainder of the request following $cmd:  
 #               In this case this will be the contents of the file.  
 #    $client  - Socket connected to the client.  
 # Returns:  
 #    1 indicating processing can continue.  
 # Side effects:  
 #   A file is created in the local filesystem.  
 #   A reply is sent to the client.  
 sub TmpPutHandler {  
     my $cmd       = shift;  
     my $what      = shift;  
     my $client    = shift;  
   
     my $userinput = "$cmd:$what"; # Reconstruct for logging.  
   
   
     my $store;  
     $tmpsnum++;  
     my $id=$$.'_'.$clientip.'_'.$tmpsnum;  
     $id=~s/\W/\_/g;  
     $what=~s/\n//g;  
     my $execdir=$perlvar{'lonDaemons'};  
     if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {  
  print $store $what;  
  close $store;  
  Reply($client, "$id\n", $userinput);  
     } else {  
  Failure( $client, "error: ".($!+0)."IO::File->new Failed ".  
  "while attempting tmpput\n", $userinput);  
     }  
     return 1;  
     
 }  
 RegisterHandler("tmpput", \&TmpPutHandler, 0, 1, 0);  
   
 #   Processes the tmpget command.  This command returns the contents  
 #  of a temporary resource file(?) created via tmpput.  
 #  
 # Paramters:  
 #    $cmd      - Command that got us dispatched.  
 #    $id       - Tail of the command, contain the id of the resource  
 #                we want to fetch.  
 #    $client   - socket open on the client.  
 # Return:  
 #    1         - Inidcating processing can continue.  
 # Side effects:  
 #   A reply is sent to the client.  
   
 #  
 sub TmpGetHandler {  
     my $cmd       = shift;  
     my $id        = shift;  
     my $client    = shift;  
     my $userinput = "$cmd:$id";   
       
   
     $id=~s/\W/\_/g;  
     my $store;  
     my $execdir=$perlvar{'lonDaemons'};  
     if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {  
  my $reply=<$store>;  
  Reply( $client, "$reply\n", $userinput);  
  close $store;  
     } else {  
  Failure( $client, "error: ".($!+0)."IO::File->new Failed ".  
  "while attempting tmpget\n", $userinput);  
     }  
   
     return 1;  
 }  
 RegisterHandler("tmpget", \&TmpGetHandler, 0, 1, 0);  
 #  
 #  Process the tmpdel command.  This command deletes a temp resource  
 #  created by the tmpput command.  
 #  
 # Parameters:  
 #   $cmd      - Command that got us here.  
 #   $id       - Id of the temporary resource created.  
 #   $client   - socket open on the client process.  
 #  
 # Returns:  
 #   1     - Indicating processing should continue.  
 # Side Effects:  
 #   A file is deleted  
 #   A reply is sent to the client.  
 sub TmpDelHandler {  
     my $cmd      = shift;  
     my $id       = shift;  
     my $client   = shift;  
       
     my $userinput= "$cmd:$id";  
       
     chomp($id);  
     $id=~s/\W/\_/g;  
     my $execdir=$perlvar{'lonDaemons'};  
     if (unlink("$execdir/tmp/$id.tmp")) {  
  Reply($client, "ok\n", $userinput);  
     } else {  
  Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".  
  "while attempting tmpdel\n", $userinput);  
     }  
       
     return 1;  
   
 }  
 RegisterHandler("tmpdel", \&TmpDelHandler, 0, 1, 0);  
 #  
 #   ls  - list the contents of a directory.  For each file in the  
 #    selected directory the filename followed by the full output of  
 #    the stat function is returned.  The returned info for each  
 #    file are separated by ':'.  The stat fields are separated by &'s.  
 # Parameters:  
 #    $cmd        - The command that dispatched us (ls).  
 #    $ulsdir     - The directory path to list... I'm not sure what this  
 #                  is relative as things like ls:. return e.g.  
 #                  no_such_dir.  
 #    $client     - Socket open on the client.  
 # Returns:  
 #     1 - indicating that the daemon should not disconnect.  
 # Side Effects:  
 #   The reply is written to  $client.  
 #  
 sub LsHandler {  
     my $cmd     = shift;  
     my $ulsdir  = shift;  
     my $client  = shift;  
   
     my $userinput = "$cmd:$ulsdir";  
   
     chomp($ulsdir);  
   
     my $ulsout='';  
     my $ulsfn;  
     logthis("ls for '$ulsdir'");  
     if (-e $ulsdir) {  
  logthis("ls - directory exists");  
  if(-d $ulsdir) {  
     logthis("ls  $ulsdir is a file");  
     if (opendir(LSDIR,$ulsdir)) {  
  while ($ulsfn=readdir(LSDIR)) {  
     my @ulsstats=stat($ulsdir.'/'.$ulsfn);  
     $ulsout.=$ulsfn.'&'.  
  join('&',@ulsstats).':';  
  }  
  closedir(LSDIR);  
     }  
  } else {  
     my @ulsstats=stat($ulsdir);  
     $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';  
  }  
     } else {  
  $ulsout='no_such_dir';  
     }  
     if ($ulsout eq '') { $ulsout='empty'; }  
     Reply($client, "$ulsout\n", $userinput);  
   
   
     return 1;  
 }  
 RegisterHandler("ls", \&LsHandler, 0, 1, 0);  
   
   
 #  
 #   Processes the setannounce command.  This command  
 #   creates a file named announce.txt in the top directory of  
 #   the documentn root and sets its contents.  The announce.txt file is  
 #   printed in its entirety at the LonCAPA login page.  Note:  
 #   once the announcement.txt fileis created it cannot be deleted.  
 #   However, setting the contents of the file to empty removes the  
 #   announcement from the login page of loncapa so who cares.  
 #  
 # Parameters:  
 #    $cmd          - The command that got us dispatched.  
 #    $announcement - The text of the announcement.  
 #    $client       - Socket open on the client process.  
 # Retunrns:  
 #   1             - Indicating request processing should continue  
 # Side Effects:  
 #   The file {DocRoot}/announcement.txt is created.  
 #   A reply is sent to $client.  
 #  
 sub SetAnnounceHandler {  
     my $cmd          = shift;  
     my $announcement = shift;  
     my $client       = shift;  
     
     my $userinput    = "$cmd:$announcement";  
   
     chomp($announcement);  
     $announcement=&unescape($announcement);  
     if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.  
  '/announcement.txt')) {  
  print $store $announcement;  
  close $store;  
  Reply($client, "ok\n", $userinput);  
     } else {  
  Failure($client, "error: ".($!+0)."\n", $userinput);  
     }  
   
     return 1;  
 }  
 RegisterHandler("setannounce", \&SetAnnounceHandler, 0, 1, 0);  
   
 #  
 #  Return the version of the daemon.  This can be used to determine  
 #  the compatibility of cross version installations or, alternatively to  
 #  simply know who's out of date and who isn't.  Note that the version  
 #  is returned concatenated with the tail.  
 # Parameters:  
 #   $cmd        - the request that dispatched to us.  
 #   $tail       - Tail of the request (client's version?).  
 #   $client     - Socket open on the client.  
 #Returns:  
 #   1 - continue processing requests.  
 # Side Effects:  
 #   Replies with version to $client.  
 sub GetVersionHandler {  
     my $client     = shift;  
     my $tail       = shift;  
     my $client     = shift;  
     my $userinput  = $client;  
       
     Reply($client, &version($userinput)."\n", $userinput);  
   
   
     return 1;  
 }  
 RegisterHandler("version", \&GetVersionHandler, 0, 1, 0);  
   
 #  Set the current host and domain.  This is used to support  
 #  multihomed systems.  Each IP of the system, or even separate daemons  
 #  on the same IP can be treated as handling a separate lonCAPA virtual  
 #  machine.  This command selects the virtual lonCAPA.  The client always  
 #  knows the right one since it is lonc and it is selecting the domain/system  
 #  from the hosts.tab file.  
 # Parameters:  
 #    $cmd      - Command that dispatched us.  
 #    $tail     - Tail of the command (domain/host requested).  
 #    $socket   - Socket open on the client.  
 #  
 # Returns:  
 #     1   - Indicates the program should continue to process requests.  
 # Side-effects:  
 #     The default domain/system context is modified for this daemon.  
 #     a reply is sent to the client.  
 #  
 sub SelectHostHandler {  
     my $cmd        = shift;  
     my $tail       = shift;  
     my $socket     = shift;  
     
     my $userinput  ="$cmd:$tail";  
   
     Reply($client, &sethost($userinput)."\n", $userinput);  
   
   
     return 1;  
 }  
 RegisterHandler("sethost", \&SelectHostHandler, 0, 1, 0);  
   
 #  Process a request to exit:  
 #   - "bye" is sent to the client.  
 #   - The client socket is shutdown and closed.  
 #   - We indicate to the caller that we should exit.  
 # Formal Parameters:  
 #   $cmd                - The command that got us here.  
 #   $tail               - Tail of the command (empty).  
 #   $client             - Socket open on the tail.  
 # Returns:  
 #   0      - Indicating the program should exit!!  
 #  
 sub ExitHandler {  
     my $cmd     = shift;  
     my $tail    = shift;  
     my $client  = shift;  
   
     my $userinput = "$cmd:$tail";  
   
     &logthis("Client $clientip ($clientname) hanging up: $userinput");  
     Reply($client, "bye\n", $userinput);  
     $client->shutdown(2);        # shutdown the socket forcibly.  
     $client->close();  
   
     return 0;  
 }  
 RegisterHandler("exit", \&ExitHandler, 0, 1,1);  
 RegisterHandler("init", \&ExitHandler, 0, 1,1); # RE-init is like exit.  
 RegisterHandler("quit", \&ExitHandler, 0, 1,1); # I like this too!  
 #------------------------------------------------------------------------------------  
 #  
 #   Process a Request.  Takes a request from the client validates  
 #   it and performs the operation requested by it.  Returns  
 #   a response to the client.  
 #  
 #  Parameters:  
 #      request      - A string containing the user's request.  
 #  Returns:  
 #      0            - Requested to exit, caller should shut down.  
 #      1            - Accept additional requests from the client.  
 #  
 sub ProcessRequest {  
     my $Request      = shift;  
     my $KeepGoing    = 1; # Assume we're not asked to stop.  
       
     my $wasenc=0;  
     my $userinput = $Request;   # for compatibility with oldcode <yeach>  
   
   
 # ------------------------------------------------------------ See if encrypted  
      
     if($userinput =~ /^enc/) {  
  $wasenc = 1;  
  $userinput = Decipher($userinput);  
  if(! $userinput) {  
     Failure($client,"error:Encrypted data without negotiating key");  
     return 0;                      # Break off with this imposter.  
  }  
     }  
     # Split off the request keyword from the rest of the stuff.  
      
     my ($command, $tail) = split(/:/, $userinput, 2);  
     chomp($command);  
     chomp($tail);  
     $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.  
   
     Debug("Command received: $command, encoded = $wasenc");  
   
      
 # ------------------------------------------------------------- Normal commands  
   
     #   
     #   If the command is in the hash, then execute it via the hash dispatch:  
     #  
     if(defined $Dispatcher{$command}) {  
   
  my $DispatchInfo = $Dispatcher{$command};  
  my $Handler      = $$DispatchInfo[0];  
  my $NeedEncode   = $$DispatchInfo[1];  
  my $ClientTypes  = $$DispatchInfo[2];  
  Debug("Matched dispatch hash: mustencode: $NeedEncode ClientType $ClientTypes");  
         
  #  Validate the request:  
         
  my $ok = 1;  
  my $requesterprivs = 0;  
  if(isClient()) {  
     $requesterprivs |= $CLIENT_OK;  
  }  
  if(isManager()) {  
     $requesterprivs |= $MANAGER_OK;  
  }  
  if($NeedEncode && (!$wasenc)) {  
     Debug("Must encode but wasn't: $NeedEncode $wasenc");  
     $ok = 0;  
  }  
  if(($ClientTypes & $requesterprivs) == 0) {  
     Debug("Client not privileged to do this operation");  
     $ok = 0;  
  }  
   
  if($ok) {  
     Debug("Dispatching to handler $command $tail");  
     $KeepGoing = &$Handler($command, $tail, $client);  
  } else {  
     Debug("Refusing to dispatch because ok is false");  
     Failure($client, "refused\n", $userinput);  
  }  
   
   
 # ------------------------------------------------------------- unknown command  
   
     } else {  
  # unknown command  
  Failure($client, "unknown_cmd\n", $userinput);  
     }  
   
     return $KeepGoing;  
 }  
   
   
 #  #
 #   GetCertificate: Given a transaction that requires a certificate,  #   GetCertificate: Given a transaction that requires a certificate,
Line 2779  sub GetCertificate { Line 137  sub GetCertificate {
     return $clientip;      return $clientip;
 }  }
   
   #
   #   Return true if client is a manager.
   #
   sub isManager {
       return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
   }
   #
   #   Return tru if client can do client functions
   #
   sub isClient {
       return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
   }
   
   
 #  #
Line 2793  sub ReadManagerTable { Line 163  sub ReadManagerTable {
   
     #   Clean out the old table first..      #   Clean out the old table first..
   
     foreach my $key (keys %managers) {     foreach my $key (keys %managers) {
  delete $managers{$key};        delete $managers{$key};
     }     }
   
     my $tablename = $perlvar{'lonTabDir'}."/managers.tab";     my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
     if (!open (MANAGERS, $tablename)) {     if (!open (MANAGERS, $tablename)) {
  logthis('<font color="red">No manager table.  Nobody can manage!!</font>');        logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
  return;        return;
     }     }
     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");           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
     #  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
     #            the host key.      #            the host key.
     #  hostname- The dns name of the host.      #  hostname- The dns name of the host.
     #      #
     my($cluname, $dnsname) = split(/:/, $host);            my($cluname, $dnsname) = split(/:/, $host);
                 
     my $ip = gethostbyname($dnsname);            my $ip = gethostbyname($dnsname);
     if(defined($ip)) {                 # bad names don't deserve entry.            if(defined($ip)) {                 # bad names don't deserve entry.
  my $hostip = inet_ntoa($ip);              my $hostip = inet_ntoa($ip);
  $managers{$hostip} = $cluname;              $managers{$hostip} = $cluname;
  logthis('<font color="green"> registering manager '.              logthis('<font color="green"> registering manager '.
  "$dnsname as $cluname with $hostip </font>\n");                      "$dnsname as $cluname with $hostip </font>\n");
     }           }
  } 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           $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber
  }        }
     }     }
 }  }
   
 #  #
Line 2862  sub CopyFile { Line 232  sub CopyFile {
   
     if(-e $oldfile) {      if(-e $oldfile) {
   
  # Read the old file.   # Read the old file.
   
  my $oldfh = IO::File->new("< $oldfile");   my $oldfh = IO::File->new("< $oldfile");
  if(!$oldfh) {   if(!$oldfh) {
Line 2915  sub AdjustHostContents { Line 285  sub AdjustHostContents {
     my $adjusted;      my $adjusted;
     my $me        = $perlvar{'lonHostID'};      my $me        = $perlvar{'lonHostID'};
   
     foreach my $line (split(/\n/,$contents)) {   foreach my $line (split(/\n/,$contents)) {
  if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {   if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
     chomp($line);      chomp($line);
     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);      my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
     if ($id eq $me) {      if ($id eq $me) {
  my $ip = gethostbyname($name);            my $ip = gethostbyname($name);
  my $ipnew = inet_ntoa($ip);            my $ipnew = inet_ntoa($ip);
  $ip = $ipnew;           $ip = $ipnew;
  #  Reconstruct the host line and append to adjusted:   #  Reconstruct the host line and append to adjusted:
   
  my $newline = "$id:$domain:$role:$name:$ip";     my $newline = "$id:$domain:$role:$name:$ip";
  if($maxcon ne "") { # Not all hosts have loncnew tuning params     if($maxcon ne "") { # Not all hosts have loncnew tuning params
     $newline .= ":$maxcon:$idleto:$mincon";       $newline .= ":$maxcon:$idleto:$mincon";
  }     }
  $adjusted .= $newline."\n";     $adjusted .= $newline."\n";
   
     } else { # Not me, pass unmodified.        } else { # Not me, pass unmodified.
  $adjusted .= $line."\n";     $adjusted .= $line."\n";
     }        }
  } else {                  # Blank or comment never re-written.   } else {                  # Blank or comment never re-written.
     $adjusted .= $line."\n"; # Pass blanks and comments as is.      $adjusted .= $line."\n"; # Pass blanks and comments as is.
  }   }
     }   }
     return $adjusted;   return $adjusted;
 }  }
 #  #
 #   InstallFile: Called to install an administrative file:  #   InstallFile: Called to install an administrative file:
Line 2961  sub InstallFile { Line 331  sub InstallFile {
     my $TempFile = $Filename.".tmp";      my $TempFile = $Filename.".tmp";
   
     #  Open the file for write:      #  Open the file for write:
       
     my $fh = IO::File->new("> $TempFile"); # Write to temp.      my $fh = IO::File->new("> $TempFile"); # Write to temp.
     if(!(defined $fh)) {      if(!(defined $fh)) {
  &logthis('<font color="red"> Unable to create '.$TempFile."</font>");   &logthis('<font color="red"> Unable to create '.$TempFile."</font>");
  return 0;   return 0;
     }      }
     #  write the contents of the file:      #  write the contents of the file:
       
     print $fh ($Contents);       print $fh ($Contents); 
     $fh->close; # In case we ever have a filesystem w. locking      $fh->close; # In case we ever have a filesystem w. locking
   
Line 3051  sub PushFile { Line 421  sub PushFile {
  return "error:$!";   return "error:$!";
     }      }
     &logthis('<font color="green"> Pushfile: backed up '      &logthis('<font color="green"> Pushfile: backed up '
      .$tablefile." to $backupfile</font>");      .$tablefile." to $backupfile</font>");
           
     #  If the file being pushed is the host file, we adjust the entry for ourself so that the      #  If the file being pushed is the host file, we adjust the entry for ourself so that the
     #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible      #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible
Line 3067  sub PushFile { Line 437  sub PushFile {
   
     if(!InstallFile($tablefile, $contents)) {      if(!InstallFile($tablefile, $contents)) {
  &logthis('<font color="red"> Pushfile: unable to install '   &logthis('<font color="red"> Pushfile: unable to install '
  .$tablefile." $! </font>");   .$tablefile." $! </font>");
  return "error:$!";   return "error:$!";
     } else {      }
       else {
  &logthis('<font color="green"> Installed new '.$tablefile   &logthis('<font color="green"> Installed new '.$tablefile
  ."</font>");   ."</font>");
   
     }      }
   
   
Line 3209  sub ApplyEdit { Line 580  sub ApplyEdit {
     } elsif ($command eq "delete") {      } elsif ($command eq "delete") {
  $editor->DeleteLine($p1);         # p1 - key p2 null.   $editor->DeleteLine($p1);         # p1 - key p2 null.
     } else {          # Should not get here!!!      } else {          # Should not get here!!!
  die "Invalid command given to ApplyEdit $command";   die "Invalid command given to ApplyEdit $command"
     }      }
 }  }
 #  #
Line 3379  sub catchexception { Line 750  sub catchexception {
     $SIG{__DIE__}='DEFAULT';      $SIG{__DIE__}='DEFAULT';
     &status("Catching exception");      &status("Catching exception");
     &logthis("<font color=red>CRITICAL: "      &logthis("<font color=red>CRITICAL: "
      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "       ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
      ."a crash with this error msg->[$error]</font>");       ."a crash with this error msg->[$error]</font>");
     &logthis('Famous last words: '.$status.' - '.$lastlog);      &logthis('Famous last words: '.$status.' - '.$lastlog);
     if ($client) { print $client "error: $error\n"; }      if ($client) { print $client "error: $error\n"; }
     $server->close();      $server->close();
Line 3406  undef $perlvarref; Line 777  undef $perlvarref;
 # ----------------------------- Make sure this process is running from user=www  # ----------------------------- Make sure this process is running from user=www
 my $wwwid=getpwnam('www');  my $wwwid=getpwnam('www');
 if ($wwwid!=$<) {  if ($wwwid!=$<) {
     my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";     my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
     my $subj="LON: $currenthostid User ID mismatch";     my $subj="LON: $currenthostid User ID mismatch";
     system("echo 'User ID mismatch.  lond must be run as user www.' |\     system("echo 'User ID mismatch.  lond must be run as user www.' |\
  mailto $emailto -s '$subj' > /dev/null");   mailto $emailto -s '$subj' > /dev/null");
     exit 1;     exit 1;
 }  }
   
 # --------------------------------------------- Check if other instance running  # --------------------------------------------- Check if other instance running
Line 3418  if ($wwwid!=$<) { Line 789  if ($wwwid!=$<) {
 my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";  my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
   
 if (-e $pidfile) {  if (-e $pidfile) {
     my $lfh=IO::File->new("$pidfile");     my $lfh=IO::File->new("$pidfile");
     my $pide=<$lfh>;     my $pide=<$lfh>;
     chomp($pide);     chomp($pide);
     if (kill 0 => $pide) { die "already running"; }     if (kill 0 => $pide) { die "already running"; }
 }  }
   
 # ------------------------------------------------------------- Read hosts file  # ------------------------------------------------------------- Read hosts file
Line 3434  $server = IO::Socket::INET->new(LocalPor Line 805  $server = IO::Socket::INET->new(LocalPor
                                 Proto     => 'tcp',                                  Proto     => 'tcp',
                                 Reuse     => 1,                                  Reuse     => 1,
                                 Listen    => 10 )                                  Listen    => 10 )
     or die "making socket: $@\n";    or die "making socket: $@\n";
   
 # --------------------------------------------------------- Do global variables  # --------------------------------------------------------- Do global variables
   
 # global variables  # global variables
   
 my %children               = ();       # keys are current child process IDs  my %children               = ();       # keys are current child process IDs
 my $children               = 0;        # current number of children  
   
 sub REAPER {                        # takes care of dead children  sub REAPER {                        # takes care of dead children
     $SIG{CHLD} = \&REAPER;      $SIG{CHLD} = \&REAPER;
     &status("Handling child death");      &status("Handling child death");
     my $pid = wait;      my $pid;
     if (defined($children{$pid})) {      do {
  &logthis("Child $pid died");   $pid = waitpid(-1,&WNOHANG());
  $children --;   if (defined($children{$pid})) {
  delete $children{$pid};      &logthis("Child $pid died");
     } else {      delete($children{$pid});
  &logthis("Unknown Child $pid died");   } else {
       &logthis("Unknown Child $pid died");
    }
       } while ( $pid > 0 );
       foreach my $child (keys(%children)) {
    $pid = waitpid($child,&WNOHANG());
    if ($pid > 0) {
       &logthis("Child $child - $pid looks like we missed it's death");
       delete($children{$pid});
    }
     }      }
     &status("Finished Handling child death");      &status("Finished Handling child death");
 }  }
Line 3508  sub ReadHostTable { Line 887  sub ReadHostTable {
     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";      open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
           
     while (my $configline=<CONFIG>) {      while (my $configline=<CONFIG>) {
  my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);   if (!($configline =~ /^\s*\#/)) {
  chomp($ip); $ip=~s/\D+$//;      my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
  $hostid{$ip}=$id;      chomp($ip); $ip=~s/\D+$//;
  $hostdom{$id}=$domain;      $hostid{$ip}=$id;
  $hostip{$id}=$ip;      $hostdom{$id}=$domain;
  if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }      $hostip{$id}=$ip;
       if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
    }
     }      }
     close(CONFIG);      close(CONFIG);
 }  }
Line 3587  sub checkchildren { Line 968  sub checkchildren {
     &status("Checking on the children (waiting for reports)");      &status("Checking on the children (waiting for reports)");
     foreach (sort keys %children) {      foreach (sort keys %children) {
         unless (-e "$docdir/lon-status/londchld/$_.txt") {          unless (-e "$docdir/lon-status/londchld/$_.txt") {
     eval {            eval {
  alarm(300);              alarm(300);
  &logthis('Child '.$_.' did not respond');      &logthis('Child '.$_.' did not respond');
  kill 9 => $_;      kill 9 => $_;
  #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";      #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
  #$subj="LON: $currenthostid killed lond process $_";      #$subj="LON: $currenthostid killed lond process $_";
  #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;      #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
  #$execdir=$perlvar{'lonDaemons'};      #$execdir=$perlvar{'lonDaemons'};
  #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;      #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
  alarm(0);      alarm(0);
     }    }
         }          }
     }      }
     $SIG{ALRM} = 'DEFAULT';      $SIG{ALRM} = 'DEFAULT';
Line 3633  sub Debug { Line 1014  sub Debug {
 #     reply   - Text to send to client.  #     reply   - Text to send to client.
 #     request - Original request from client.  #     request - Original request from client.
 #  #
 #  Note: This increments Transactions  
 #  
 sub Reply {  sub Reply {
     alarm(120);  
     my $fd      = shift;      my $fd      = shift;
     my $reply   = shift;      my $reply   = shift;
     my $request = shift;      my $request = shift;
Line 3644  sub Reply { Line 1022  sub Reply {
     print $fd $reply;      print $fd $reply;
     Debug("Request was $request  Reply was $reply");      Debug("Request was $request  Reply was $reply");
   
     $Transactions++;  
     alarm(0);  
   
   
 }  
 #  
 #    Sub to report a failure.  
 #    This function:  
 #     -   Increments the failure statistic counters.  
 #     -   Invokes Reply to send the error message to the client.  
 # Parameters:  
 #    fd       - File descriptor open on the client  
 #    reply    - Reply text to emit.  
 #    request  - The original request message (used by Reply  
 #               to debug if that's enabled.  
 # Implicit outputs:  
 #    $Failures- The number of failures is incremented.  
 #    Reply (invoked here) sends a message to the   
 #    client:  
 #  
 sub Failure {  
     my $fd      = shift;  
     my $reply   = shift;  
     my $request = shift;  
      
     $Failures++;  
     Reply($fd, $reply, $request);      # That's simple eh?  
 }  }
 # ------------------------------------------------------------------ Log status  # ------------------------------------------------------------------ Log status
   
Line 3678  sub logstatus { Line 1029  sub logstatus {
     &status("Doing logging");      &status("Doing logging");
     my $docdir=$perlvar{'lonDocRoot'};      my $docdir=$perlvar{'lonDocRoot'};
     {      {
  my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");      my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
  print $fh $$."\t".$currenthostid."\t".$status."\t".$lastlog."\n";      print $fh $$."\t".$clientname."\t".$currenthostid."\t".$status."\t".$lastlog."\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;
  $fh->close();          $fh->close();
     }      }
     ResetStatistics;  
     &status("Finished logging");      &status("Finished logging");
      
 }  }
   
 sub initnewstatus {  sub initnewstatus {
Line 3712  sub status { Line 1061  sub status {
     my $what=shift;      my $what=shift;
     my $now=time;      my $now=time;
     my $local=localtime($now);      my $local=localtime($now);
     my $status = "lond: $what $local ";      $status=$local.': '.$what;
     if($Transactions) {      $0='lond: '.$what.' '.$local;
  $status .= " Transactions: $Transactions Failed; $Failures";  
     }  
     $0=$status;  
 }  }
   
 # -------------------------------------------------------- Escape Special Chars  # -------------------------------------------------------- Escape Special Chars
Line 3748  sub reconlonc { Line 1094  sub reconlonc {
     &logthis("lonc at pid $loncpid responding, sending USR1");      &logthis("lonc at pid $loncpid responding, sending USR1");
             kill USR1 => $loncpid;              kill USR1 => $loncpid;
         } else {          } else {
     &logthis("<font color=red>CRITICAL: "      &logthis(
      ."lonc at pid $loncpid not responding, giving up</font>");                "<font color=red>CRITICAL: "
                ."lonc at pid $loncpid not responding, giving up</font>");
         }          }
     } else {      } else {
  &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');        &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
     }      }
 }  }
   
Line 3764  sub subreply { Line 1111  sub subreply {
     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",      my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                                       Type    => SOCK_STREAM,                                        Type    => SOCK_STREAM,
                                       Timeout => 10)                                        Timeout => 10)
  or return "con_lost";         or return "con_lost";
     print $sclient "$cmd\n";      print $sclient "$cmd\n";
     my $answer=<$sclient>;      my $answer=<$sclient>;
     chomp($answer);      chomp($answer);
Line 3773  sub subreply { Line 1120  sub subreply {
 }  }
   
 sub reply {  sub reply {
     my ($cmd,$server)=@_;    my ($cmd,$server)=@_;
     my $answer;    my $answer;
     if ($server ne $currenthostid) {     if ($server ne $currenthostid) { 
  $answer=subreply($cmd,$server);      $answer=subreply($cmd,$server);
  if ($answer eq 'con_lost') {      if ($answer eq 'con_lost') {
     $answer=subreply("ping",$server);   $answer=subreply("ping",$server);
     if ($answer ne $server) {          if ($answer ne $server) {
  &logthis("sub reply: answer != server answer is $answer, server is $server");      &logthis("sub reply: answer != server answer is $answer, server is $server");
  &reconlonc("$perlvar{'lonSockDir'}/$server");             &reconlonc("$perlvar{'lonSockDir'}/$server");
     }          }
     $answer=subreply($cmd,$server);          $answer=subreply($cmd,$server);
  }      }
     } else {    } else {
  $answer='self_reply';      $answer='self_reply';
     }     } 
     return $answer;    return $answer;
 }  }
   
 # -------------------------------------------------------------- Talk to lonsql  # -------------------------------------------------------------- Talk to lonsql
Line 3807  sub subsqlreply { Line 1154  sub subsqlreply {
     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",      my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                                       Type    => SOCK_STREAM,                                        Type    => SOCK_STREAM,
                                       Timeout => 10)                                        Timeout => 10)
  or return "con_lost";         or return "con_lost";
     print $sclient "$cmd\n";      print $sclient "$cmd\n";
     my $answer=<$sclient>;      my $answer=<$sclient>;
     chomp($answer);      chomp($answer);
Line 3819  sub subsqlreply { Line 1166  sub subsqlreply {
   
 sub propath {  sub propath {
     my ($udom,$uname)=@_;      my ($udom,$uname)=@_;
     Debug("Propath:$udom:$uname");  
     $udom=~s/\W//g;      $udom=~s/\W//g;
     $uname=~s/\W//g;      $uname=~s/\W//g;
     Debug("Propath2:$udom:$uname");  
     my $subdir=$uname.'__';      my $subdir=$uname.'__';
     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;      $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";      my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
     Debug("Propath returning $proname");  
     return $proname;      return $proname;
 }   } 
   
Line 3834  sub propath { Line 1178  sub propath {
   
 sub ishome {  sub ishome {
     my $author=shift;      my $author=shift;
     Debug("ishome: $author");  
     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;      $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
     Debug("     after big regsub: $author");  
     my ($udom,$uname)=split(/\//,$author);      my ($udom,$uname)=split(/\//,$author);
     Debug("      domain: $udom  user: $uname");  
     my $proname=propath($udom,$uname);      my $proname=propath($udom,$uname);
     Debug("     path = $proname");  
     if (-e $proname) {      if (-e $proname) {
  return 'owner';   return 'owner';
     } else {      } else {
Line 3881  $SIG{USR2} = \&UpdateHosts; Line 1221  $SIG{USR2} = \&UpdateHosts;
   
 ReadHostTable;  ReadHostTable;
   
   
 # --------------------------------------------------------------  # --------------------------------------------------------------
 #   Accept connections.  When a connection comes in, it is validated  #   Accept connections.  When a connection comes in, it is validated
 #   and if good, a child process is created to process transactions  #   and if good, a child process is created to process transactions
Line 3897  while (1) { Line 1236  while (1) {
   
 sub make_new_child {  sub make_new_child {
     my $pid;      my $pid;
       my $cipher;
     my $sigset;      my $sigset;
   
     $client = shift;      $client = shift;
Line 3907  sub make_new_child { Line 1247  sub make_new_child {
     $sigset = POSIX::SigSet->new(SIGINT);      $sigset = POSIX::SigSet->new(SIGINT);
     sigprocmask(SIG_BLOCK, $sigset)      sigprocmask(SIG_BLOCK, $sigset)
         or die "Can't block SIGINT for fork: $!\n";          or die "Can't block SIGINT for fork: $!\n";
       
     die "fork: $!" unless defined ($pid = fork);      die "fork: $!" unless defined ($pid = fork);
   
     $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of      $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
Line 3926  sub make_new_child { Line 1266  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";
         $children{$pid} = $clientip;          $children{$pid} = $clientip;
         $children++;  
         &status('Started child '.$pid);          &status('Started child '.$pid);
         return;          return;
     } else {      } else {
Line 3943  sub make_new_child { Line 1282  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;
   #---------------------------------------------------- kerberos 5 initialization
         &Authen::Krb5::init_context();          &Authen::Krb5::init_context();
         &Authen::Krb5::init_ets();          &Authen::Krb5::init_ets();
   
  &status('Accepted connection');   &status('Accepted connection');
 # =============================================================================  # =============================================================================
             # do something with the connection              # do something with the connection
Line 3974  sub make_new_child { Line 1313  sub make_new_child {
     &status("Waiting for init from $clientip $clientname");      &status("Waiting for init from $clientip $clientname");
     &logthis('<font color="yellow">INFO: Connection, '.      &logthis('<font color="yellow">INFO: Connection, '.
      $clientip.       $clientip.
      " ($clientname) connection type = $ConnectionType </font>" );    " ($clientname) connection type = $ConnectionType </font>" );
     &status("Connecting $clientip  ($clientname))");       &status("Connecting $clientip  ($clientname))"); 
     my $remotereq=<$client>;      my $remotereq=<$client>;
     $remotereq=~s/[^\w:]//g;      $remotereq=~s/[^\w:]//g;
Line 3982  sub make_new_child { Line 1321  sub make_new_child {
  &sethost("sethost:$perlvar{'lonHostID'}");   &sethost("sethost:$perlvar{'lonHostID'}");
  my $challenge="$$".time;   my $challenge="$$".time;
  print $client "$challenge\n";   print $client "$challenge\n";
  &status("Waiting for challenge reply from $clientip ($clientname)");    &status(
    "Waiting for challenge reply from $clientip ($clientname)"); 
  $remotereq=<$client>;   $remotereq=<$client>;
  $remotereq=~s/\W//g;   $remotereq=~s/\W//g;
  if ($challenge eq $remotereq) {   if ($challenge eq $remotereq) {
     $clientok=1;      $clientok=1;
     print $client "ok\n";      print $client "ok\n";
  } else {   } else {
     &logthis("<font color=blue>WARNING: $clientip did not reply challenge</font>");      &logthis(
        "<font color=blue>WARNING: $clientip did not reply challenge</font>");
     &status('No challenge reply '.$clientip);      &status('No challenge reply '.$clientip);
  }   }
     } else {      } else {
  &logthis("<font color=blue>WARNING: "   &logthis(
    "<font color=blue>WARNING: "
  ."$clientip failed to initialize: >$remotereq< </font>");   ."$clientip failed to initialize: >$remotereq< </font>");
  &status('No init '.$clientip);   &status('No init '.$clientip);
     }      }
  } else {   } else {
     &logthis("<font color=blue>WARNING: Unknown client $clientip</font>");      &logthis(
        "<font color=blue>WARNING: Unknown client $clientip</font>");
     &status('Hung up on '.$clientip);      &status('Hung up on '.$clientip);
  }   }
  if ($clientok) {   if ($clientok) {
Line 4014  sub make_new_child { Line 1357  sub make_new_child {
     }      }
     &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);
   # ------------------------------------------------------------ Process requests
       while (my $userinput=<$client>) {
                   chomp($userinput);
    Debug("Request = $userinput\n");
                   &status('Processing '.$clientname.': '.$userinput);
                   my $wasenc=0;
                   alarm(120);
   # ------------------------------------------------------------ See if encrypted
    if ($userinput =~ /^enc/) {
       if ($cipher) {
    my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
    $userinput='';
    for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
       $userinput.=
    $cipher->decrypt(
    pack("H16",substr($encinput,$encidx,16))
    );
    }
    $userinput=substr($userinput,0,$cmdlength);
    $wasenc=1;
       }
    }
   
   # ------------------------------------------------------------- Normal commands
   # ------------------------------------------------------------------------ ping
    if ($userinput =~ /^ping/) { # client only
       if(isClient) {
    print $client "$currenthostid\n";
       } else {
    Reply($client, "refused\n", $userinput);
       }
   # ------------------------------------------------------------------------ pong
    }elsif ($userinput =~ /^pong/) { # client only
       if(isClient) {
    my $reply=&reply("ping",$clientname);
    print $client "$currenthostid:$reply\n"; 
       } else {
    Reply($client, "refused\n", $userinput);
       }
   # ------------------------------------------------------------------------ ekey
    } elsif ($userinput =~ /^ekey/) { # ok for both clients & mgrs
       my $buildkey=time.$$.int(rand 100000);
       $buildkey=~tr/1-6/A-F/;
       $buildkey=int(rand 100000).$buildkey.int(rand 100000);
       my $key=$currenthostid.$clientname;
       $key=~tr/a-z/A-Z/;
       $key=~tr/G-P/0-9/;
       $key=~tr/Q-Z/0-9/;
       $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
       $key=substr($key,0,32);
       my $cipherkey=pack("H32",$key);
       $cipher=new IDEA $cipherkey;
       print $client "$buildkey\n"; 
   # ------------------------------------------------------------------------ load
    } elsif ($userinput =~ /^load/) { # client only
       if (isClient) {
    my $loadavg;
    {
       my $loadfile=IO::File->new('/proc/loadavg');
       $loadavg=<$loadfile>;
    }
    $loadavg =~ s/\s.*//g;
    my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
    print $client "$loadpercent\n";
       } else {
    Reply($client, "refused\n", $userinput);
          
       }
   # -------------------------------------------------------------------- userload
    } elsif ($userinput =~ /^userload/) { # client only
       if(isClient) {
    my $userloadpercent=&userload();
    print $client "$userloadpercent\n";
       } else {
    Reply($client, "refused\n", $userinput);
        
       }
   #
   #        Transactions requiring encryption:
   #
   # ----------------------------------------------------------------- currentauth
    } elsif ($userinput =~ /^currentauth/) {
       if (($wasenc==1)  && isClient) { # Encoded & client only.
    my ($cmd,$udom,$uname)=split(/:/,$userinput);
    my $result = GetAuthType($udom, $uname);
    if($result eq "nouser") {
       print $client "unknown_user\n";
    }
    else {
       print $client "$result\n"
       }
       } else {
    Reply($client, "refused\n", $userinput);
   
       }
   #--------------------------------------------------------------------- pushfile
    } elsif($userinput =~ /^pushfile/) { # encoded & manager.
       if(($wasenc == 1) && isManager) {
    my $cert = GetCertificate($userinput);
    if(ValidManager($cert)) {
       my $reply = PushFile($userinput);
       print $client "$reply\n";
    } else {
       print $client "refused\n";
    } 
       } else {
    Reply($client, "refused\n", $userinput);
   
       }
   #--------------------------------------------------------------------- reinit
    } elsif($userinput =~ /^reinit/) { # Encoded and manager
    if (($wasenc == 1) && isManager) {
    my $cert = GetCertificate($userinput);
    if(ValidManager($cert)) {
    chomp($userinput);
    my $reply = ReinitProcess($userinput);
    print $client  "$reply\n";
    } else {
    print $client "refused\n";
    }
    } else {
    Reply($client, "refused\n", $userinput);
    }
   #------------------------------------------------------------------------- edit
       } elsif ($userinput =~ /^edit/) {    # encoded and manager:
    if(($wasenc ==1) && (isManager)) {
       my $cert = GetCertificate($userinput);
       if(ValidManager($cert)) {
                  my($command, $filetype, $script) = split(/:/, $userinput);
                  if (($filetype eq "hosts") || ($filetype eq "domain")) {
                     if($script ne "") {
         Reply($client, EditFile($userinput));
                     } else {
                        Reply($client,"refused\n",$userinput);
                     }
                  } else {
                     Reply($client,"refused\n",$userinput);
                  }
               } else {
                  Reply($client,"refused\n",$userinput);
               }
            } else {
        Reply($client,"refused\n",$userinput);
    }
   # ------------------------------------------------------------------------ auth
       } elsif ($userinput =~ /^auth/) { # Encoded and client only.
       if (($wasenc==1) && isClient) {
    my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
    chomp($upass);
    $upass=unescape($upass);
    my $proname=propath($udom,$uname);
    my $passfilename="$proname/passwd";
    if (-e $passfilename) {
       my $pf = IO::File->new($passfilename);
       my $realpasswd=<$pf>;
       chomp($realpasswd);
       my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
       my $pwdcorrect=0;
       if ($howpwd eq 'internal') {
    &Debug("Internal auth");
    $pwdcorrect=
       (crypt($upass,$contentpwd) eq $contentpwd);
       } elsif ($howpwd eq 'unix') {
    &Debug("Unix auth");
    if((getpwnam($uname))[1] eq "") { #no such user!
       $pwdcorrect = 0;
    } else {
       $contentpwd=(getpwnam($uname))[1];
       my $pwauth_path="/usr/local/sbin/pwauth";
       unless ($contentpwd eq 'x') {
    $pwdcorrect=
       (crypt($upass,$contentpwd) eq 
        $contentpwd);
       }
       
       elsif (-e $pwauth_path) {
    open PWAUTH, "|$pwauth_path" or
       die "Cannot invoke authentication";
    print PWAUTH "$uname\n$upass\n";
    close PWAUTH;
    $pwdcorrect=!$?;
       }
    }
       } elsif ($howpwd eq 'krb4') {
    my $null=pack("C",0);
    unless ($upass=~/$null/) {
       my $krb4_error = &Authen::Krb4::get_pw_in_tkt
    ($uname,"",$contentpwd,'krbtgt',
    $contentpwd,1,$upass);
       if (!$krb4_error) {
    $pwdcorrect = 1;
       } else { 
    $pwdcorrect=0; 
    # log error if it is not a bad password
    if ($krb4_error != 62) {
       &logthis('krb4:'.$uname.','.$contentpwd.','.
        &Authen::Krb4::get_err_txt($Authen::Krb4::error));
    }
       }
    }
       } elsif ($howpwd eq 'krb5') {
    my $null=pack("C",0);
    unless ($upass=~/$null/) {
       my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
       my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
       my $krbserver=&Authen::Krb5::parse_name($krbservice);
       my $credentials=&Authen::Krb5::cc_default();
       $credentials->initialize($krbclient);
       my $krbreturn = 
    &Authen::Krb5::get_in_tkt_with_password(
    $krbclient,$krbserver,$upass,$credentials);
   #  unless ($krbreturn) {
   #      &logthis("Krb5 Error: ".
   #       &Authen::Krb5::error());
   #  }
       $pwdcorrect = ($krbreturn == 1);
    } else { $pwdcorrect=0; }
       } elsif ($howpwd eq 'localauth') {
    $pwdcorrect=&localauth::localauth($uname,$upass,
     $contentpwd);
       }
       if ($pwdcorrect) {
    print $client "authorized\n";
       } else {
    print $client "non_authorized\n";
       }  
    } else {
       print $client "unknown_user\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
          
       }
   # ---------------------------------------------------------------------- passwd
    } elsif ($userinput =~ /^passwd/) { # encoded and client
       if (($wasenc==1) && isClient) {
    my 
       ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
    chomp($npass);
    $upass=&unescape($upass);
    $npass=&unescape($npass);
    &Debug("Trying to change password for $uname");
    my $proname=propath($udom,$uname);
    my $passfilename="$proname/passwd";
    if (-e $passfilename) {
       my $realpasswd;
       { my $pf = IO::File->new($passfilename);
         $realpasswd=<$pf>; }
       chomp($realpasswd);
       my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
       if ($howpwd eq 'internal') {
    &Debug("internal auth");
    if (crypt($upass,$contentpwd) eq $contentpwd) {
       my $salt=time;
       $salt=substr($salt,6,2);
       my $ncpass=crypt($npass,$salt);
       {
    my $pf;
    if ($pf = IO::File->new(">$passfilename")) {
       print $pf "internal:$ncpass\n";
       &logthis("Result of password change for $uname: pwchange_success");
       print $client "ok\n";
    } else {
       &logthis("Unable to open $uname passwd to change password");
       print $client "non_authorized\n";
    }
       }             
       
    } else {
       print $client "non_authorized\n";
    }
       } elsif ($howpwd eq 'unix') {
    # Unix means we have to access /etc/password
    # one way or another.
    # First: Make sure the current password is
    #        correct
    &Debug("auth is unix");
    $contentpwd=(getpwnam($uname))[1];
    my $pwdcorrect = "0";
    my $pwauth_path="/usr/local/sbin/pwauth";
    unless ($contentpwd eq 'x') {
       $pwdcorrect=
    (crypt($upass,$contentpwd) eq $contentpwd);
    } elsif (-e $pwauth_path) {
       open PWAUTH, "|$pwauth_path" or
    die "Cannot invoke authentication";
       print PWAUTH "$uname\n$upass\n";
       close PWAUTH;
       &Debug("exited pwauth with $? ($uname,$upass) ");
       $pwdcorrect=($? == 0);
    }
    if ($pwdcorrect) {
       my $execdir=$perlvar{'lonDaemons'};
       &Debug("Opening lcpasswd pipeline");
       my $pf = IO::File->new("|$execdir/lcpasswd > $perlvar{'lonDaemons'}/logs/lcpasswd.log");
       print $pf "$uname\n$npass\n$npass\n";
       close $pf;
       my $err = $?;
       my $result = ($err>0 ? 'pwchange_failure' 
     : 'ok');
       &logthis("Result of password change for $uname: ".
        &lcpasswdstrerror($?));
       print $client "$result\n";
    } else {
       print $client "non_authorized\n";
    }
       } else {
    print $client "auth_mode_error\n";
       }  
    } else {
       print $client "unknown_user\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
          
       }
   # -------------------------------------------------------------------- makeuser
    } elsif ($userinput =~ /^makeuser/) { # encoded and client.
       &Debug("Make user received");
       my $oldumask=umask(0077);
       if (($wasenc==1) && isClient) {
    my 
       ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
    &Debug("cmd =".$cmd." $udom =".$udom.
          " uname=".$uname);
    chomp($npass);
    $npass=&unescape($npass);
    my $proname=propath($udom,$uname);
    my $passfilename="$proname/passwd";
    &Debug("Password file created will be:".
          $passfilename);
    if (-e $passfilename) {
       print $client "already_exists\n";
    } elsif ($udom ne $currentdomainid) {
       print $client "not_right_domain\n";
    } else {
       my @fpparts=split(/\//,$proname);
       my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
       my $fperror='';
       for (my $i=3;$i<=$#fpparts;$i++) {
    $fpnow.='/'.$fpparts[$i]; 
    unless (-e $fpnow) {
       unless (mkdir($fpnow,0777)) {
    $fperror="error: ".($!+0)
       ." mkdir failed while attempting "
       ."makeuser";
       }
    }
       }
       unless ($fperror) {
    my $result=&make_passwd_file($uname, $umode,$npass,
        $passfilename);
    print $client $result;
       } else {
    print $client "$fperror\n";
       }
    }
       } else {
    Reply($client, "refused\n", $userinput);
         
       }
       umask($oldumask);
   # -------------------------------------------------------------- changeuserauth
    } elsif ($userinput =~ /^changeuserauth/) { # encoded & client
       &Debug("Changing authorization");
       if (($wasenc==1) && isClient) {
    my 
       ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
    chomp($npass);
    &Debug("cmd = ".$cmd." domain= ".$udom.
          "uname =".$uname." umode= ".$umode);
    $npass=&unescape($npass);
    my $proname=&propath($udom,$uname);
    my $passfilename="$proname/passwd";
    if ($udom ne $currentdomainid) {
       print $client "not_right_domain\n";
    } else {
       my $result=&make_passwd_file($uname, $umode,$npass,
    $passfilename);
       print $client $result;
    }
       } else {
    Reply($client, "refused\n", $userinput);
      
       }
   # ------------------------------------------------------------------------ home
    } elsif ($userinput =~ /^home/) { # client clear or encoded
       if(isClient) {
    my ($cmd,$udom,$uname)=split(/:/,$userinput);
    chomp($uname);
    my $proname=propath($udom,$uname);
    if (-e $proname) {
       print $client "found\n";
    } else {
       print $client "not_found\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
   
     ResetStatistics();      }
   # ---------------------------------------------------------------------- update
    } elsif ($userinput =~ /^update/) { # client clear or encoded.
       if(isClient) {
    my ($cmd,$fname)=split(/:/,$userinput);
    my $ownership=ishome($fname);
    if ($ownership eq 'not_owner') {
       if (-e $fname) {
    my ($dev,$ino,$mode,$nlink,
       $uid,$gid,$rdev,$size,
       $atime,$mtime,$ctime,
       $blksize,$blocks)=stat($fname);
    my $now=time;
    my $since=$now-$atime;
    if ($since>$perlvar{'lonExpire'}) {
       my $reply=
    &reply("unsub:$fname","$clientname");
       unlink("$fname");
    } else {
       my $transname="$fname.in.transfer";
       my $remoteurl=
    &reply("sub:$fname","$clientname");
       my $response;
       {
    my $ua=new LWP::UserAgent;
    my $request=new HTTP::Request('GET',"$remoteurl");
    $response=$ua->request($request,$transname);
       }
       if ($response->is_error()) {
    unlink($transname);
    my $message=$response->status_line;
    &logthis(
    "LWP GET: $message for $fname ($remoteurl)");
       } else {
    if ($remoteurl!~/\.meta$/) {
       my $ua=new LWP::UserAgent;
       my $mrequest=
    new HTTP::Request('GET',$remoteurl.'.meta');
       my $mresponse=
    $ua->request($mrequest,$fname.'.meta');
       if ($mresponse->is_error()) {
    unlink($fname.'.meta');
       }
    }
    rename($transname,$fname);
       }
    }
    print $client "ok\n";
       } else {
    print $client "not_found\n";
       }
    } else {
       print $client "rejected\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
   
 # ------------------------------------------------------------ Process requests      }
     my $KeepGoing = 1;  # -------------------------------------- fetch a user file from a remote server
     while ((my $userinput=GetRequest) && $KeepGoing) {   } elsif ($userinput =~ /^fetchuserfile/) { # Client clear or enc.
  $KeepGoing = ProcessRequest($userinput);      if(isClient) {
 # -------------------------------------------------------------------- complete   my ($cmd,$fname)=split(/:/,$userinput);
    my ($udom,$uname,$ufile)=split(/\//,$fname);
    my $udir=propath($udom,$uname).'/userfiles';
    unless (-e $udir) { mkdir($udir,0770); }
    if (-e $udir) {
       $ufile=~s/^[\.\~]+//;
       $ufile=~s/\///g;
       my $destname=$udir.'/'.$ufile;
       my $transname=$udir.'/'.$ufile.'.in.transit';
       my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
       my $response;
       {
    my $ua=new LWP::UserAgent;
    my $request=new HTTP::Request('GET',"$remoteurl");
    $response=$ua->request($request,$transname);
       }
       if ($response->is_error()) {
    unlink($transname);
    my $message=$response->status_line;
    &logthis("LWP GET: $message for $fname ($remoteurl)");
    print $client "failed\n";
       } else {
    if (!rename($transname,$destname)) {
       &logthis("Unable to move $transname to $destname");
       unlink($transname);
       print $client "failed\n";
    } else {
       print $client "ok\n";
    }
       }
    } else {
       print $client "not_home\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
   
       }
   # ------------------------------------------ authenticate access to a user file
    } elsif ($userinput =~ /^tokenauthuserfile/) { # Client only
       if(isClient) {
    my ($cmd,$fname,$session)=split(/:/,$userinput);
    chomp($session);
    my $reply='non_auth';
    if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
    $session.'.id')) {
       while (my $line=<ENVIN>) {
    if ($line=~/userfile\.$fname\=/) { $reply='ok'; }
       }
       close(ENVIN);
       print $client $reply."\n";
    } else {
       print $client "invalid_token\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
   
       }
   # ----------------------------------------------------------------- unsubscribe
    } elsif ($userinput =~ /^unsub/) {
       if(isClient) {
    my ($cmd,$fname)=split(/:/,$userinput);
    if (-e $fname) {
       print $client &unsub($client,$fname,$clientip);
    } else {
       print $client "not_found\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
   
       }
   # ------------------------------------------------------------------- subscribe
    } elsif ($userinput =~ /^sub/) {
       if(isClient) {
    print $client &subscribe($userinput,$clientip);
       } else {
    Reply($client, "refused\n", $userinput);
   
       }
   # ------------------------------------------------------------- current version
    } elsif ($userinput =~ /^currentversion/) {
       if(isClient) {
    my ($cmd,$fname)=split(/:/,$userinput);
    print $client &currentversion($fname)."\n";
       } else {
    Reply($client, "refused\n", $userinput);
   
       }
   # ------------------------------------------------------------------------- log
    } elsif ($userinput =~ /^log/) {
       if(isClient) {
    my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
    chomp($what);
    my $proname=propath($udom,$uname);
    my $now=time;
    {
       my $hfh;
       if ($hfh=IO::File->new(">>$proname/activity.log")) { 
    print $hfh "$now:$clientname:$what\n";
    print $client "ok\n"; 
       } else {
    print $client "error: ".($!+0)
       ." IO::File->new Failed "
       ."while attempting log\n";
       }
    }
       } else {
    Reply($client, "refused\n", $userinput);
   
       }
   # ------------------------------------------------------------------------- put
    } elsif ($userinput =~ /^put/) {
       if(isClient) {
    my ($cmd,$udom,$uname,$namespace,$what)
       =split(/:/,$userinput);
    $namespace=~s/\//\_/g;
    $namespace=~s/\W//g;
    if ($namespace ne 'roles') {
       chomp($what);
       my $proname=propath($udom,$uname);
       my $now=time;
       unless ($namespace=~/^nohist\_/) {
    my $hfh;
    if (
       $hfh=IO::File->new(">>$proname/$namespace.hist")
       ) { print $hfh "P:$now:$what\n"; }
       }
       my @pairs=split(/\&/,$what);
       my %hash;
       if (tie(%hash,'GDBM_File',
       "$proname/$namespace.db",
       &GDBM_WRCREAT(),0640)) {
    foreach my $pair (@pairs) {
       my ($key,$value)=split(/=/,$pair);
       $hash{$key}=$value;
    }
    if (untie(%hash)) {
       print $client "ok\n";
    } else {
       print $client "error: ".($!+0)
    ." untie(GDBM) failed ".
    "while attempting put\n";
    }
       } else {
    print $client "error: ".($!)
       ." tie(GDBM) Failed ".
       "while attempting put\n";
       }
    } else {
       print $client "refused\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
   
       }
   # ------------------------------------------------------------------- inc
    } elsif ($userinput =~ /^inc:/) {
       if(isClient) {
    my ($cmd,$udom,$uname,$namespace,$what)
       =split(/:/,$userinput);
    $namespace=~s/\//\_/g;
    $namespace=~s/\W//g;
    if ($namespace ne 'roles') {
       chomp($what);
       my $proname=propath($udom,$uname);
       my $now=time;
       unless ($namespace=~/^nohist\_/) {
    my $hfh;
    if (
       $hfh=IO::File->new(">>$proname/$namespace.hist")
       ) { print $hfh "P:$now:$what\n"; }
       }
       my @pairs=split(/\&/,$what);
       my %hash;
       if (tie(%hash,'GDBM_File',
       "$proname/$namespace.db",
       &GDBM_WRCREAT(),0640)) {
    foreach my $pair (@pairs) {
       my ($key,$value)=split(/=/,$pair);
                                       # We could check that we have a number...
                                       if (! defined($value) || $value eq '') {
                                           $value = 1;
                                       }
       $hash{$key}+=$value;
    }
    if (untie(%hash)) {
       print $client "ok\n";
    } else {
       print $client "error: ".($!+0)
    ." untie(GDBM) failed ".
    "while attempting put\n";
    }
       } else {
    print $client "error: ".($!)
       ." tie(GDBM) Failed ".
       "while attempting put\n";
       }
    } else {
       print $client "refused\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
   
       }
   # -------------------------------------------------------------------- rolesput
    } elsif ($userinput =~ /^rolesput/) {
       if(isClient) {
    &Debug("rolesput");
    if ($wasenc==1) {
       my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
    =split(/:/,$userinput);
       &Debug("cmd = ".$cmd." exedom= ".$exedom.
      "user = ".$exeuser." udom=".$udom.
      "what = ".$what);
       my $namespace='roles';
       chomp($what);
       my $proname=propath($udom,$uname);
       my $now=time;
       {
    my $hfh;
    if (
       $hfh=IO::File->new(">>$proname/$namespace.hist")
       ) { 
       print $hfh "P:$now:$exedom:$exeuser:$what\n";
    }
       }
       my @pairs=split(/\&/,$what);
       my %hash;
       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
    foreach my $pair (@pairs) {
       my ($key,$value)=split(/=/,$pair);
       &ManagePermissions($key, $udom, $uname,
          &GetAuthType( $udom, 
        $uname));
       $hash{$key}=$value;
    }
    if (untie(%hash)) {
       print $client "ok\n";
    } else {
       print $client "error: ".($!+0)
    ." untie(GDBM) Failed ".
    "while attempting rolesput\n";
    }
       } else {
    print $client "error: ".($!+0)
       ." tie(GDBM) Failed ".
       "while attempting rolesput\n";
       }
    } else {
       print $client "refused\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
     
       }
   # -------------------------------------------------------------------- rolesdel
    } elsif ($userinput =~ /^rolesdel/) {
       if(isClient) {
    &Debug("rolesdel");
    if ($wasenc==1) {
       my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
    =split(/:/,$userinput);
       &Debug("cmd = ".$cmd." exedom= ".$exedom.
      "user = ".$exeuser." udom=".$udom.
      "what = ".$what);
       my $namespace='roles';
       chomp($what);
       my $proname=propath($udom,$uname);
       my $now=time;
       {
    my $hfh;
    if (
       $hfh=IO::File->new(">>$proname/$namespace.hist")
       ) { 
       print $hfh "D:$now:$exedom:$exeuser:$what\n";
    }
       }
       my @rolekeys=split(/\&/,$what);
       my %hash;
       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
    foreach my $key (@rolekeys) {
       delete $hash{$key};
    }
    if (untie(%hash)) {
       print $client "ok\n";
    } else {
       print $client "error: ".($!+0)
    ." untie(GDBM) Failed ".
    "while attempting rolesdel\n";
    }
       } else {
    print $client "error: ".($!+0)
       ." tie(GDBM) Failed ".
       "while attempting rolesdel\n";
       }
    } else {
       print $client "refused\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
         
       }
   # ------------------------------------------------------------------------- get
    } elsif ($userinput =~ /^get/) {
       if(isClient) {
    my ($cmd,$udom,$uname,$namespace,$what)
       =split(/:/,$userinput);
    $namespace=~s/\//\_/g;
    $namespace=~s/\W//g;
    chomp($what);
    my @queries=split(/\&/,$what);
    my $proname=propath($udom,$uname);
    my $qresult='';
    my %hash;
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
       for (my $i=0;$i<=$#queries;$i++) {
    $qresult.="$hash{$queries[$i]}&";
       }
       if (untie(%hash)) {
    $qresult=~s/\&$//;
    print $client "$qresult\n";
       } else {
    print $client "error: ".($!+0)
       ." untie(GDBM) Failed ".
       "while attempting get\n";
       }
    } else {
       if ($!+0 == 2) {
    print $client "error:No such file or ".
       "GDBM reported bad block error\n";
       } else {
    print $client "error: ".($!+0)
       ." tie(GDBM) Failed ".
       "while attempting get\n";
       }
    }
       } else {
    Reply($client, "refused\n", $userinput);
          
       }
   # ------------------------------------------------------------------------ eget
    } elsif ($userinput =~ /^eget/) {
       if (isClient) {
    my ($cmd,$udom,$uname,$namespace,$what)
       =split(/:/,$userinput);
    $namespace=~s/\//\_/g;
    $namespace=~s/\W//g;
    chomp($what);
    my @queries=split(/\&/,$what);
    my $proname=propath($udom,$uname);
    my $qresult='';
    my %hash;
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
       for (my $i=0;$i<=$#queries;$i++) {
    $qresult.="$hash{$queries[$i]}&";
       }
       if (untie(%hash)) {
    $qresult=~s/\&$//;
    if ($cipher) {
       my $cmdlength=length($qresult);
       $qresult.="         ";
       my $encqresult='';
       for 
    (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
       $encqresult.=
    unpack("H16",
          $cipher->encrypt(substr($qresult,$encidx,8)));
    }
       print $client "enc:$cmdlength:$encqresult\n";
    } else {
       print $client "error:no_key\n";
    }
       } else {
    print $client "error: ".($!+0)
       ." untie(GDBM) Failed ".
       "while attempting eget\n";
       }
    } else {
       print $client "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting eget\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
       
       }
   # ------------------------------------------------------------------------- del
    } elsif ($userinput =~ /^del/) {
       if(isClient) {
    my ($cmd,$udom,$uname,$namespace,$what)
       =split(/:/,$userinput);
    $namespace=~s/\//\_/g;
    $namespace=~s/\W//g;
    chomp($what);
    my $proname=propath($udom,$uname);
    my $now=time;
    unless ($namespace=~/^nohist\_/) {
       my $hfh;
       if (
    $hfh=IO::File->new(">>$proname/$namespace.hist")
    ) { print $hfh "D:$now:$what\n"; }
    }
    my @keys=split(/\&/,$what);
    my %hash;
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
       foreach my $key (@keys) {
    delete($hash{$key});
       }
       if (untie(%hash)) {
    print $client "ok\n";
       } else {
    print $client "error: ".($!+0)
       ." untie(GDBM) Failed ".
       "while attempting del\n";
       }
    } else {
       print $client "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting del\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
   
       }
   # ------------------------------------------------------------------------ keys
    } elsif ($userinput =~ /^keys/) {
       if(isClient) {
    my ($cmd,$udom,$uname,$namespace)
       =split(/:/,$userinput);
    $namespace=~s/\//\_/g;
    $namespace=~s/\W//g;
    my $proname=propath($udom,$uname);
    my $qresult='';
    my %hash;
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
       foreach my $key (keys %hash) {
    $qresult.="$key&";
       }
       if (untie(%hash)) {
    $qresult=~s/\&$//;
    print $client "$qresult\n";
       } else {
    print $client "error: ".($!+0)
       ." untie(GDBM) Failed ".
       "while attempting keys\n";
       }
    } else {
       print $client "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting keys\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
      
       }
   # ----------------------------------------------------------------- dumpcurrent
    } elsif ($userinput =~ /^currentdump/) {
       if (isClient) {
    my ($cmd,$udom,$uname,$namespace)
       =split(/:/,$userinput);
    $namespace=~s/\//\_/g;
    $namespace=~s/\W//g;
    my $qresult='';
    my $proname=propath($udom,$uname);
    my %hash;
    if (tie(%hash,'GDBM_File',
    "$proname/$namespace.db",
    &GDBM_READER(),0640)) {
       # Structure of %data:
       # $data{$symb}->{$parameter}=$value;
       # $data{$symb}->{'v.'.$parameter}=$version;
       # since $parameter will be unescaped, we do not
       # have to worry about silly parameter names...
       my %data = ();
       while (my ($key,$value) = each(%hash)) {
    my ($v,$symb,$param) = split(/:/,$key);
    next if ($v eq 'version' || $symb eq 'keys');
    next if (exists($data{$symb}) && 
    exists($data{$symb}->{$param}) &&
    $data{$symb}->{'v.'.$param} > $v);
    $data{$symb}->{$param}=$value;
    $data{$symb}->{'v.'.$param}=$v;
       }
       if (untie(%hash)) {
    while (my ($symb,$param_hash) = each(%data)) {
       while(my ($param,$value) = each (%$param_hash)){
    next if ($param =~ /^v\./);
    $qresult.=$symb.':'.$param.'='.$value.'&';
       }
    }
    chop($qresult);
    print $client "$qresult\n";
       } else {
    print $client "error: ".($!+0)
       ." untie(GDBM) Failed ".
       "while attempting currentdump\n";
       }
    } else {
       print $client "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting currentdump\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
       }
   # ------------------------------------------------------------------------ dump
    } elsif ($userinput =~ /^dump/) {
       if(isClient) {
    my ($cmd,$udom,$uname,$namespace,$regexp)
       =split(/:/,$userinput);
    $namespace=~s/\//\_/g;
    $namespace=~s/\W//g;
    if (defined($regexp)) {
       $regexp=&unescape($regexp);
    } else {
       $regexp='.';
    }
    my $qresult='';
    my $proname=propath($udom,$uname);
    my %hash;
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
          while (my ($key,$value) = each(%hash)) {
      if ($regexp eq '.') {
          $qresult.=$key.'='.$value.'&';
      } else {
          my $unescapeKey = &unescape($key);
          if (eval('$unescapeKey=~/$regexp/')) {
      $qresult.="$key=$value&";
          }
      }
          }
          if (untie(%hash)) {
      chop($qresult);
      print $client "$qresult\n";
          } else {
      print $client "error: ".($!+0)
          ." untie(GDBM) Failed ".
                                          "while attempting dump\n";
          }
      } else {
          print $client "error: ".($!+0)
      ." tie(GDBM) Failed ".
      "while attempting dump\n";
      }
       } else {
    Reply($client, "refused\n", $userinput);
     
       }
   # ----------------------------------------------------------------------- store
    } elsif ($userinput =~ /^store/) {
       if(isClient) {
    my ($cmd,$udom,$uname,$namespace,$rid,$what)
       =split(/:/,$userinput);
    $namespace=~s/\//\_/g;
    $namespace=~s/\W//g;
    if ($namespace ne 'roles') {
       chomp($what);
       my $proname=propath($udom,$uname);
       my $now=time;
       unless ($namespace=~/^nohist\_/) {
    my $hfh;
    if (
       $hfh=IO::File->new(">>$proname/$namespace.hist")
       ) { print $hfh "P:$now:$rid:$what\n"; }
       }
       my @pairs=split(/\&/,$what);
       my %hash;
       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
    my @previouskeys=split(/&/,$hash{"keys:$rid"});
    my $key;
    $hash{"version:$rid"}++;
    my $version=$hash{"version:$rid"};
    my $allkeys=''; 
    foreach my $pair (@pairs) {
       my ($key,$value)=split(/=/,$pair);
       $allkeys.=$key.':';
       $hash{"$version:$rid:$key"}=$value;
    }
    $hash{"$version:$rid:timestamp"}=$now;
    $allkeys.='timestamp';
    $hash{"$version:keys:$rid"}=$allkeys;
    if (untie(%hash)) {
       print $client "ok\n";
    } else {
       print $client "error: ".($!+0)
    ." untie(GDBM) Failed ".
    "while attempting store\n";
    }
       } else {
    print $client "error: ".($!+0)
       ." tie(GDBM) Failed ".
       "while attempting store\n";
       }
    } else {
       print $client "refused\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
        
       }
   # --------------------------------------------------------------------- restore
    } elsif ($userinput =~ /^restore/) {
       if(isClient) {
    my ($cmd,$udom,$uname,$namespace,$rid)
       =split(/:/,$userinput);
    $namespace=~s/\//\_/g;
    $namespace=~s/\W//g;
    chomp($rid);
    my $proname=propath($udom,$uname);
    my $qresult='';
    my %hash;
    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
       my $version=$hash{"version:$rid"};
       $qresult.="version=$version&";
       my $scope;
       for ($scope=1;$scope<=$version;$scope++) {
    my $vkeys=$hash{"$scope:keys:$rid"};
    my @keys=split(/:/,$vkeys);
    my $key;
    $qresult.="$scope:keys=$vkeys&";
    foreach $key (@keys) {
       $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
    }                                  
       }
       if (untie(%hash)) {
    $qresult=~s/\&$//;
    print $client "$qresult\n";
       } else {
    print $client "error: ".($!+0)
       ." untie(GDBM) Failed ".
       "while attempting restore\n";
       }
    } else {
       print $client "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting restore\n";
    }
       } else  {
    Reply($client, "refused\n", $userinput);
          
       }
   # -------------------------------------------------------------------- chatsend
    } elsif ($userinput =~ /^chatsend/) {
       if(isClient) {
    my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
    &chatadd($cdom,$cnum,$newpost);
    print $client "ok\n";
       } else {
    Reply($client, "refused\n", $userinput);
         
       }
   # -------------------------------------------------------------------- chatretr
    } elsif ($userinput =~ /^chatretr/) {
       if(isClient) {
    my 
       ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);
    my $reply='';
    foreach (&getchat($cdom,$cnum,$udom,$uname)) {
       $reply.=&escape($_).':';
    }
    $reply=~s/\:$//;
    print $client $reply."\n";
       } else {
    Reply($client, "refused\n", $userinput);
          
       }
   # ------------------------------------------------------------------- querysend
    } elsif ($userinput =~ /^querysend/) {
       if(isClient) {
    my ($cmd,$query,
       $arg1,$arg2,$arg3)=split(/\:/,$userinput);
    $query=~s/\n*$//g;
    print $client "".
       sqlreply("$clientname\&$query".
        "\&$arg1"."\&$arg2"."\&$arg3")."\n";
       } else {
    Reply($client, "refused\n", $userinput);
         
       }
   # ------------------------------------------------------------------ queryreply
    } elsif ($userinput =~ /^queryreply/) {
       if(isClient) {
    my ($cmd,$id,$reply)=split(/:/,$userinput); 
    my $store;
    my $execdir=$perlvar{'lonDaemons'};
    if ($store=IO::File->new(">$execdir/tmp/$id")) {
       $reply=~s/\&/\n/g;
       print $store $reply;
       close $store;
       my $store2=IO::File->new(">$execdir/tmp/$id.end");
       print $store2 "done\n";
       close $store2;
       print $client "ok\n";
    }
    else {
       print $client "error: ".($!+0)
    ." IO::File->new Failed ".
    "while attempting queryreply\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
        
       }
   # ----------------------------------------------------------------- courseidput
    } elsif ($userinput =~ /^courseidput/) {
       if(isClient) {
    my ($cmd,$udom,$what)=split(/:/,$userinput);
    chomp($what);
    $udom=~s/\W//g;
    my $proname=
       "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
    my $now=time;
    my @pairs=split(/\&/,$what);
    my %hash;
    if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
       foreach my $pair (@pairs) {
    my ($key,$value)=split(/=/,$pair);
    $hash{$key}=$value.':'.$now;
       }
       if (untie(%hash)) {
    print $client "ok\n";
       } else {
    print $client "error: ".($!+0)
       ." untie(GDBM) Failed ".
       "while attempting courseidput\n";
       }
    } else {
       print $client "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting courseidput\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
          
       }
   # ---------------------------------------------------------------- courseiddump
    } elsif ($userinput =~ /^courseiddump/) {
       if(isClient) {
    my ($cmd,$udom,$since,$description)
       =split(/:/,$userinput);
    if (defined($description)) {
       $description=&unescape($description);
    } else {
       $description='.';
    }
    unless (defined($since)) { $since=0; }
    my $qresult='';
    my $proname=
       "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
    my %hash;
    if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
       while (my ($key,$value) = each(%hash)) {
    my ($descr,$lasttime)=split(/\:/,$value);
    if ($lasttime<$since) { next; }
    if ($description eq '.') {
       $qresult.=$key.'='.$descr.'&';
    } else {
       my $unescapeVal = &unescape($descr);
       if (eval('$unescapeVal=~/$description/i')) {
    $qresult.="$key=$descr&";
       }
    }
       }
       if (untie(%hash)) {
    chop($qresult);
    print $client "$qresult\n";
       } else {
    print $client "error: ".($!+0)
       ." untie(GDBM) Failed ".
       "while attempting courseiddump\n";
       }
    } else {
       print $client "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting courseiddump\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
          
       }
   # ----------------------------------------------------------------------- idput
    } elsif ($userinput =~ /^idput/) {
       if(isClient) {
    my ($cmd,$udom,$what)=split(/:/,$userinput);
    chomp($what);
    $udom=~s/\W//g;
    my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
    my $now=time;
    {
       my $hfh;
       if (
    $hfh=IO::File->new(">>$proname.hist")
    ) { print $hfh "P:$now:$what\n"; }
    }
    my @pairs=split(/\&/,$what);
    my %hash;
    if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
       foreach my $pair (@pairs) {
    my ($key,$value)=split(/=/,$pair);
    $hash{$key}=$value;
       }
       if (untie(%hash)) {
    print $client "ok\n";
       } else {
    print $client "error: ".($!+0)
       ." untie(GDBM) Failed ".
       "while attempting idput\n";
       }
    } else {
       print $client "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting idput\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
          
       }
   # ----------------------------------------------------------------------- idget
    } elsif ($userinput =~ /^idget/) {
       if(isClient) {
    my ($cmd,$udom,$what)=split(/:/,$userinput);
    chomp($what);
    $udom=~s/\W//g;
    my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
    my @queries=split(/\&/,$what);
    my $qresult='';
    my %hash;
    if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
       for (my $i=0;$i<=$#queries;$i++) {
    $qresult.="$hash{$queries[$i]}&";
       }
       if (untie(%hash)) {
    $qresult=~s/\&$//;
    print $client "$qresult\n";
       } else {
    print $client "error: ".($!+0)
       ." untie(GDBM) Failed ".
       "while attempting idget\n";
       }
    } else {
       print $client "error: ".($!+0)
    ." tie(GDBM) Failed ".
    "while attempting idget\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
          
       }
   # ---------------------------------------------------------------------- tmpput
    } elsif ($userinput =~ /^tmpput/) {
       if(isClient) {
    my ($cmd,$what)=split(/:/,$userinput);
    my $store;
    $tmpsnum++;
    my $id=$$.'_'.$clientip.'_'.$tmpsnum;
    $id=~s/\W/\_/g;
    $what=~s/\n//g;
    my $execdir=$perlvar{'lonDaemons'};
    if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
       print $store $what;
       close $store;
       print $client "$id\n";
    }
    else {
       print $client "error: ".($!+0)
    ."IO::File->new Failed ".
    "while attempting tmpput\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
       
       }
       
   # ---------------------------------------------------------------------- tmpget
    } elsif ($userinput =~ /^tmpget/) {
       if(isClient) {
    my ($cmd,$id)=split(/:/,$userinput);
    chomp($id);
    $id=~s/\W/\_/g;
    my $store;
    my $execdir=$perlvar{'lonDaemons'};
    if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
       my $reply=<$store>;
       print $client "$reply\n";
       close $store;
    }
    else {
       print $client "error: ".($!+0)
    ."IO::File->new Failed ".
    "while attempting tmpget\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
         
       }
   # ---------------------------------------------------------------------- tmpdel
    } elsif ($userinput =~ /^tmpdel/) {
       if(isClient) {
    my ($cmd,$id)=split(/:/,$userinput);
    chomp($id);
    $id=~s/\W/\_/g;
    my $execdir=$perlvar{'lonDaemons'};
    if (unlink("$execdir/tmp/$id.tmp")) {
       print $client "ok\n";
    } else {
       print $client "error: ".($!+0)
    ."Unlink tmp Failed ".
    "while attempting tmpdel\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
        
       }
   # -------------------------------------------------------------------------- ls
    } elsif ($userinput =~ /^ls/) {
       if(isClient) {
    my $obs;
    my $rights;
    my ($cmd,$ulsdir)=split(/:/,$userinput);
    my $ulsout='';
    my $ulsfn;
    if (-e $ulsdir) {
       if(-d $ulsdir) {
    if (opendir(LSDIR,$ulsdir)) {
       while ($ulsfn=readdir(LSDIR)) {
    undef $obs, $rights; 
    my @ulsstats=stat($ulsdir.'/'.$ulsfn);
    #We do some obsolete checking here
    if(-e $ulsdir.'/'.$ulsfn.".meta") { 
       open(FILE, $ulsdir.'/'.$ulsfn.".meta");
       my @obsolete=<FILE>;
       foreach my $obsolete (@obsolete) {
           if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; } 
    if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
       }
    }
    $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
    if($obs eq '1') { $ulsout.="&1"; }
    else { $ulsout.="&0"; }
    if($rights eq '1') { $ulsout.="&1:"; }
    else { $ulsout.="&0:"; }
       }
       closedir(LSDIR);
    }
       } else {
    my @ulsstats=stat($ulsdir);
    $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
       }
    } else {
       $ulsout='no_such_dir';
    }
    if ($ulsout eq '') { $ulsout='empty'; }
    print $client "$ulsout\n";
       } else {
    Reply($client, "refused\n", $userinput);
        
       }
   # ----------------------------------------------------------------- setannounce
    } elsif ($userinput =~ /^setannounce/) {
       if (isClient) {
    my ($cmd,$announcement)=split(/:/,$userinput);
    chomp($announcement);
    $announcement=&unescape($announcement);
    if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
       '/announcement.txt')) {
       print $store $announcement;
       close $store;
       print $client "ok\n";
    } else {
       print $client "error: ".($!+0)."\n";
    }
       } else {
    Reply($client, "refused\n", $userinput);
          
       }
   # ------------------------------------------------------------------ Hanging up
    } elsif (($userinput =~ /^exit/) ||
    ($userinput =~ /^init/)) { # no restrictions.
       &logthis(
        "Client $clientip ($clientname) hanging up: $userinput");
       print $client "bye\n";
       $client->shutdown(2);        # shutdown the socket forcibly.
       $client->close();
       last;
   
   # ---------------------------------- set current host/domain
    } elsif ($userinput =~ /^sethost:/) {
       if (isClient) {
    print $client &sethost($userinput)."\n";
       } else {
    print $client "refused\n";
       }
   #---------------------------------- request file (?) version.
    } elsif ($userinput =~/^version:/) {
       if (isClient) {
    print $client &version($userinput)."\n";
       } else {
    print $client "refused\n";
       }
   # ------------------------------------------------------------- unknown command
   
    } else {
       # unknown command
       print $client "unknown_cmd\n";
    }
   # -------------------------------------------------------------------- complete
    alarm(0);
  &status('Listening to '.$clientname);   &status('Listening to '.$clientname);
     }      }
 # --------------------------------------------- client unknown or fishy, refuse  # --------------------------------------------- client unknown or fishy, refuse
Line 4059  sub make_new_child { Line 2859  sub make_new_child {
 #    user      - Name of the user for which the role is being put.  #    user      - Name of the user for which the role is being put.
 #    authtype  - The authentication type associated with the user.  #    authtype  - The authentication type associated with the user.
 #  #
 sub ManagePermissions {  sub ManagePermissions
   {
     my $request = shift;      my $request = shift;
     my $domain  = shift;      my $domain  = shift;
     my $user    = shift;      my $user    = shift;
     my $authtype= shift;      my $authtype= shift;
   
     # See if the request is of the form /$domain/_au      # See if the request is of the form /$domain/_au
     &logthis("request is $request");  
     if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...      if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
  my $execdir = $perlvar{'lonDaemons'};   my $execdir = $perlvar{'lonDaemons'};
  my $userhome= "/home/$user" ;   my $userhome= "/home/$user" ;
Line 4074  sub ManagePermissions { Line 2874  sub ManagePermissions {
  system("$execdir/lchtmldir $userhome $user $authtype");   system("$execdir/lchtmldir $userhome $user $authtype");
     }      }
 }  }
   
 #  
 #  Return the full path of a user password file, whether it exists or not.  
 # Parameters:  
 #   domain     - Domain in which the password file lives.  
 #   user       - name of the user.  
 # Returns:  
 #    Full passwd path:  
 #  
 sub PasswordPath {  
     my $domain = shift;  
     my $user   = shift;  
   
     my $path   = &propath($domain, $user);  
     $path  .= "/passwd";  
   
     return $path;  
 }  
   
 #   Password Filename  
 #   Returns the path to a passwd file given domain and user... only if  
 #  it exists.  
 # Parameters:  
 #   domain    - Domain in which to search.  
 #   user      - username.  
 # Returns:  
 #   - If the password file exists returns its path.  
 #   - If the password file does not exist, returns undefined.  
 #  
 sub PasswordFilename {  
     my $domain    = shift;  
     my $user      = shift;  
   
     Debug ("PasswordFilename called: dom = $domain user = $user");  
   
     my $path  = PasswordPath($domain, $user);  
     Debug("PasswordFilename got path: $path");  
     if(-e $path) {  
  return $path;  
     } else {  
  return undef;  
     }  
 }  
   
 #  
 #   Rewrite the contents of the user's passwd file.  
 #  Parameters:  
 #    domain    - domain of the user.  
 #    name      - User's name.  
 #    contents  - New contents of the file.  
 # Returns:  
 #   0    - Failed.  
 #   1    - Success.  
 #  
 sub RewritePwFile {  
     my $domain   = shift;  
     my $user     = shift;  
     my $contents = shift;  
   
     my $file = PasswordFilename($domain, $user);  
     if (defined $file) {  
  my $pf = IO::File->new(">$file");  
  if($pf) {  
     print $pf "$contents\n";  
     return 1;  
  } else {  
     return 0;  
  }  
     } else {  
  return 0;  
     }  
   
 }  
 #  #
 #   GetAuthType - Determines the authorization type of a user in a domain.  #   GetAuthType - Determines the authorization type of a user in a domain.
   
 #     Returns the authorization type or nouser if there is no such user.  #     Returns the authorization type or nouser if there is no such user.
 #  #
 sub GetAuthType {  sub GetAuthType 
   {
     my $domain = shift;      my $domain = shift;
     my $user   = shift;      my $user   = shift;
   
     Debug("GetAuthType( $domain, $user ) \n");      Debug("GetAuthType( $domain, $user ) \n");
     my $passwdfile = PasswordFilename($domain, $user);      my $proname    = &propath($domain, $user); 
     if( defined $passwdfile ) {      my $passwdfile = "$proname/passwd";
       if( -e $passwdfile ) {
  my $pf = IO::File->new($passwdfile);   my $pf = IO::File->new($passwdfile);
  my $realpassword = <$pf>;   my $realpassword = <$pf>;
  chomp($realpassword);   chomp($realpassword);
  Debug("Password info = $realpassword\n");   Debug("Password info = $realpassword\n");
  return $realpassword;   my ($authtype, $contentpwd) = split(/:/, $realpassword);
     } else {   Debug("Authtype = $authtype, content = $contentpwd\n");
  Debug("Returning nouser");   my $availinfo = '';
  return "nouser";   if($authtype eq 'krb4' or $authtype eq 'krb5') {
     }      $availinfo = $contentpwd;
 }  
   
 #  
 #  Validate a user given their domain, name and password.  This utility  
 #  function is used by both  AuthenticateHandler and ChangePasswordHandler  
 #  to validate the login credentials of a user.  
 # Parameters:  
 #    $domain    - The domain being logged into (this is required due to  
 #                 the capability for multihomed systems.  
 #    $user      - The name of the user being validated.  
 #    $password  - The user's propoposed password.  
 #  
 # Returns:  
 #     1        - The domain,user,pasword triplet corresponds to a valid  
 #                user.  
 #     0        - The domain,user,password triplet is not a valid user.  
 #  
 sub ValidateUser {  
     my $domain  = shift;  
     my $user    = shift;  
     my $password= shift;  
   
     # Why negative ~pi you may well ask?  Well this function is about  
     # authentication, and therefore very important to get right.  
     # I've initialized the flag that determines whether or not I've   
     # validated correctly to a value it's not supposed to get.  
     # At the end of this function. I'll ensure that it's not still that  
     # value so we don't just wind up returning some accidental value  
     # as a result of executing an unforseen code path that  
     # did not set $validated.  
   
     my $validated = -3.14159;  
   
     #  How we authenticate is determined by the type of authentication  
     #  the user has been assigned.  If the authentication type is  
     #  "nouser", the user does not exist so we will return 0.  
   
     my $contents = GetAuthType($domain, $user);  
     my ($howpwd, $contentpwd) = split(/:/, $contents);  
   
     my $null = pack("C",0); # Used by kerberos auth types.  
   
     if ($howpwd ne 'nouser') {  
   
  if($howpwd eq "internal") { # Encrypted is in local password file.  
     $validated = (crypt($password, $contentpwd) eq $contentpwd);  
  }  
  elsif ($howpwd eq "unix") { # User is a normal unix user.  
     $contentpwd = (getpwnam($user))[1];  
     if($contentpwd) {  
  if($contentpwd eq 'x') { # Shadow password file...  
     my $pwauth_path = "/usr/local/sbin/pwauth";  
     open PWAUTH,  "|$pwauth_path" or  
  die "Cannot invoke authentication";  
     print PWAUTH "$user\n$password\n";  
     close PWAUTH;  
     $validated = ! $?;  
   
  } else {         # Passwords in /etc/passwd.   
     $validated = (crypt($password,  
  $contentpwd) eq $contentpwd);  
  }  
     } else {  
  $validated = 0;  
     }  
  }  
  elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.  
     if(! ($password =~ /$null/) ) {  
  my $k4error = &Authen::Krb4::get_pw_in_tkt($user,  
    "",  
    $contentpwd,,  
    'krbtgt',  
    $contentpwd,  
    1,  
    $password);  
  if(!$k4error) {  
     $validated = 1;  
  }  
  else {  
     $validated = 0;  
     &logthis('krb4: '.$user.', '.$contentpwd.', '.  
      &Authen::Krb4::get_err_txt($Authen::Krb4::error));  
  }  
     }  
     else {  
  $validated = 0; # Password has a match with null.  
     }  
  }   }
  elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.  
     if(!($password =~ /$null/)) { # Null password not allowed.  
  my $krbclient = &Authen::Krb5::parse_name($user.'@'  
   .$contentpwd);  
  my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;  
  my $krbserver  = &Authen::Krb5::parse_name($krbservice);  
  my $credentials= &Authen::Krb5::cc_default();  
  $credentials->initialize($krbclient);  
  my $krbreturn  = &Authen::KRb5::get_in_tkt_with_password($krbclient,  
  $krbserver,  
  $password,  
  $credentials);  
  $validated = ($krbreturn == 1);  
     }  
     else {  
  $validated = 0;  
     }  
  }  
  elsif ($howpwd eq "localauth") {   
     #  Authenticate via installation specific authentcation method:  
     $validated = &localauth::localauth($user,   
        $password,   
        $contentpwd);  
  }  
  else { # Unrecognized auth is also bad.  
     $validated = 0;  
  }  
     } else {  
  $validated = 0;  
     }  
     #  
     #  $validated has the correct stat of the authentication:  
     #  
   
     unless ($validated != -3.14159) {   return "$authtype:$availinfo";
  die "ValidateUser - failed to set the value of validated";      }
       else {
    Debug("Returning nouser");
    return "nouser";
     }      }
     return $validated;  
 }  }
   
 #  
 #    Add a line to the subscription list?  
 #  
 sub addline {  sub addline {
     my ($fname,$hostid,$ip,$newline)=@_;      my ($fname,$hostid,$ip,$newline)=@_;
     my $contents;      my $contents;
Line 4306  sub addline { Line 2914  sub addline {
     my $expr='^'.$hostid.':'.$ip.':';      my $expr='^'.$hostid.':'.$ip.':';
     $expr =~ s/\./\\\./g;      $expr =~ s/\./\\\./g;
     my $sh;      my $sh;
     Debug("Looking for $expr");  
     if ($sh=IO::File->new("$fname.subscription")) {      if ($sh=IO::File->new("$fname.subscription")) {
  while (my $subline=<$sh>) {   while (my $subline=<$sh>) {
     Debug("addline: line: $subline");      if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
     if ($subline !~ /$expr/) {  
  $contents.= $subline;  
     } else {  
  Debug("Found $subline");  
  $found=1;  
     }  
  }   }
  $sh->close();   $sh->close();
     }      }
     $sh=IO::File->new(">$fname.subscription");      $sh=IO::File->new(">$fname.subscription");
     if ($contents) { print $sh $contents; }      if ($contents) { print $sh $contents; }
     if ($newline) {       if ($newline) { print $sh $newline; }
  Debug("Appending $newline");  
  print $sh $newline;   
     }  
     $sh->close();      $sh->close();
     return $found;      return $found;
 }  }
 #  
 #    Get chat messages.  
 #  
 sub getchat {  sub getchat {
     my ($cdom,$cname,$udom,$uname)=@_;      my ($cdom,$cname,$udom,$uname)=@_;
     my %hash;      my %hash;
Line 4355  sub getchat { Line 2951  sub getchat {
     }      }
     return (@participants,@entries);      return (@participants,@entries);
 }  }
 #  
 #   Add a chat message  
 #  
 sub chatadd {  sub chatadd {
     my ($cdom,$cname,$newchat)=@_;      my ($cdom,$cname,$newchat)=@_;
     my %hash;      my %hash;
Line 4397  sub chatadd { Line 2991  sub chatadd {
 sub unsub {  sub unsub {
     my ($fname,$clientip)=@_;      my ($fname,$clientip)=@_;
     my $result;      my $result;
     my $unsubs = 0; # Number of successful unsubscribes:  
   
   
     # An old way subscriptions were handled was to have a   
     # subscription marker file:  
   
     Debug("Attempting unlink of $fname.$clientname");  
     if (unlink("$fname.$clientname")) {      if (unlink("$fname.$clientname")) {
  $unsubs++; # Successful unsub via marker file.   $result="ok\n";
     }       } else {
    $result="not_subscribed\n";
     # The more modern way to do it is to have a subscription list      }
     # file:  
   
     if (-e "$fname.subscription") {      if (-e "$fname.subscription") {
  my $found=&addline($fname,$clientname,$clientip,'');   my $found=&addline($fname,$clientname,$clientip,'');
  if ($found) {    if ($found) { $result="ok\n"; }
     $unsubs++;  
  }  
     }   
   
     #  If either or both of these mechanisms succeeded in unsubscribing a   
     #  resource we can return ok:  
   
     if($unsubs) {  
  $result = "ok\n";  
     } else {      } else {
  $result = "not_subscribed\n";   if ($result != "ok\n") { $result="not_subscribed\n"; }
     }      }
   
     return $result;      return $result;
 }  }
   
Line 4435  sub currentversion { Line 3010  sub currentversion {
     my $version=-1;      my $version=-1;
     my $ulsdir='';      my $ulsdir='';
     if ($fname=~/^(.+)\/[^\/]+$/) {      if ($fname=~/^(.+)\/[^\/]+$/) {
  $ulsdir=$1;         $ulsdir=$1;
     }      }
     my ($fnamere1,$fnamere2);      my ($fnamere1,$fnamere2);
     # remove version if already specified      # remove version if already specified
Line 4478  sub thisversion { Line 3053  sub thisversion {
   
 sub subscribe {  sub subscribe {
     my ($userinput,$clientip)=@_;      my ($userinput,$clientip)=@_;
     chomp($userinput);  
     my $result;      my $result;
     my ($cmd,$fname)=split(/:/,$userinput);      my ($cmd,$fname)=split(/:/,$userinput);
     my $ownership=&ishome($fname);      my $ownership=&ishome($fname);
     Debug("subscribe: Owner = $ownership file: '$fname'");  
     if ($ownership eq 'owner') {      if ($ownership eq 'owner') {
 # explitly asking for the current version?  # explitly asking for the current version?
         unless (-e $fname) {          unless (-e $fname) {
     Debug("subscribe - does not exist");  
             my $currentversion=&currentversion($fname);              my $currentversion=&currentversion($fname);
     if (&thisversion($fname)==$currentversion) {      if (&thisversion($fname)==$currentversion) {
                 if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {                  if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
Line 4495  sub subscribe { Line 3067  sub subscribe {
                     symlink($root.'.'.$extension,                      symlink($root.'.'.$extension,
                             $root.'.'.$currentversion.'.'.$extension);                              $root.'.'.$currentversion.'.'.$extension);
                     unless ($extension=~/\.meta$/) {                      unless ($extension=~/\.meta$/) {
  symlink($root.'.'.$extension.'.meta',                         symlink($root.'.'.$extension.'.meta',
  $root.'.'.$currentversion.'.'.$extension.'.meta');                              $root.'.'.$currentversion.'.'.$extension.'.meta');
     }      }
                 }                  }
             }              }
         }          }
  if (-e $fname) {   if (-e $fname) {
     Debug("subscribe - exists");  
     if (-d $fname) {      if (-d $fname) {
  $result="directory\n";   $result="directory\n";
     } else {      } else {
Line 4551  sub make_passwd_file { Line 3122  sub make_passwd_file {
     print $pf "localauth:$npass\n";      print $pf "localauth:$npass\n";
  }   }
     } elsif ($umode eq 'unix') {      } elsif ($umode eq 'unix') {
  #   {
  #  Don't allow the creation of privileged accounts!!! that would      my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
  #  be real bad!!!      {
  #   &Debug("Executing external: ".$execpath);
  my $uid = getpwnam($uname);   &Debug("user  = ".$uname.", Password =". $npass);
  if((defined $uid) && ($uid == 0)) {   my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
     &logthis(">>>Attempted add of privileged account blocked<<<");   print $se "$uname\n";
     return "no_priv_account_error\n";   print $se "$npass\n";
  }   print $se "$npass\n";
       }
  #      my $useraddok = $?;
  my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";      if($useraddok > 0) {
    &logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));
  &Debug("Executing external: ".$execpath);      }
  &Debug("user  = ".$uname.", Password =". $npass);      my $pf = IO::File->new(">$passfilename");
  my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");      print $pf "unix:\n";
  print $se "$uname\n";  
  print $se "$npass\n";  
  print $se "$npass\n";  
   
  my $useraddok = $?;  
  if($useraddok > 0) {  
     my $lcstring = lcuseraddstrerror($useraddok);  
     &logthis("Failed lcuseradd: $lcstring");  
     return "error: lcuseradd failed: $lcstring\n";  
  }   }
  my $pf = IO::File->new(">$passfilename");  
  print $pf "unix:\n";  
    
     } elsif ($umode eq 'none') {      } elsif ($umode eq 'none') {
  {   {
     my $pf = IO::File->new(">$passfilename");      my $pf = IO::File->new(">$passfilename");
Line 4593  sub make_passwd_file { Line 3152  sub make_passwd_file {
   
 sub sethost {  sub sethost {
     my ($remotereq) = @_;      my ($remotereq) = @_;
     Debug("sethost got $remotereq");  
     my (undef,$hostid)=split(/:/,$remotereq);      my (undef,$hostid)=split(/:/,$remotereq);
     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }      if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
     Debug("sethost attempting to set host $hostid");  
     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {      if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
  $currenthostid=$hostid;   $currenthostid=$hostid;
  $currentdomainid=$hostdom{$hostid};   $currentdomainid=$hostdom{$hostid};
Line 4614  sub version { Line 3171  sub version {
     $remoteVERSION=(split(/:/,$userinput))[1];      $remoteVERSION=(split(/:/,$userinput))[1];
     return "version:$VERSION";      return "version:$VERSION";
 }  }
 ############## >>>>>>>>>>>>>>>>>>>>>>>>>> FUTUREWORK <<<<<<<<<<<<<<<<<<<<<<<<<<<<  
 #There is a copy of this in lonnet.pm  #There is a copy of this in lonnet.pm
 #   Can we hoist these lil' things out into common places?  
 #  
 sub userload {  sub userload {
     my $numusers=0;      my $numusers=0;
     {      {
Removed from v.1.178.2.23  
changed lines
  Added in v.1.179

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