File:  [LON-CAPA] / loncom / lonnet / perl / lonnet.pm
Revision 1.20: download - view: text, annotated - select for diffs
Fri Jul 21 00:40:37 2000 UTC (24 years ago) by www
Branches: MAIN
CVS tags: HEAD
Now handles empty directories correctly

    1: # The LearningOnline Network
    2: # TCP networking package
    3: #
    4: # Functions for use by content handlers:
    5: #
    6: # plaintext(short)   : plain text explanation of short term
    7: # allowed(short,url) : returns codes for allowed actions
    8: # appendenv(hash)    : adds hash to session environment
    9: # store(hash)        : stores hash permanently for this url
   10: # restore            : returns hash for this url
   11: # eget(namesp,array) : returns hash with keys from array filled in from namesp
   12: # get(namesp,array)  : returns hash with keys from array filled in from namesp
   13: # put(namesp,hash)   : stores hash in namesp
   14: # dump(namesp)       : dumps the complete namespace into a hash
   15: # ssi(url)           : does a complete request cycle on url to localhost
   16: # repcopy(filename)  : replicate file
   17: # dirlist(url)       : gets a directory listing
   18: #
   19: # 6/1/99,6/2,6/10,6/11,6/12,6/14,6/26,6/28,6/29,6/30,
   20: # 7/1,7/2,7/9,7/10,7/12,7/14,7/15,7/19,
   21: # 11/8,11/16,11/18,11/22,11/23,12/22,
   22: # 01/06,01/13,02/24,02/28,02/29,
   23: # 03/01,03/02,03/06,03/07,03/13,
   24: # 04/05,05/29,05/31,06/01,
   25: # 06/05,06/26 Gerd Kortemeyer
   26: # 06/26 Ben Tyszka
   27: # 06/30,07/15,07/17,07/18 Gerd Kortemeyer
   28: 
   29: package Apache::lonnet;
   30: 
   31: use strict;
   32: use Apache::File;
   33: use LWP::UserAgent();
   34: use HTTP::Headers;
   35: use vars 
   36: qw(%perlvar %hostname %homecache %spareid %hostdom %libserv %pr %prp $readit);
   37: use IO::Socket;
   38: use Apache::Constants qw(:common :http);
   39: 
   40: # --------------------------------------------------------------------- Logging
   41: 
   42: sub logthis {
   43:     my $message=shift;
   44:     my $execdir=$perlvar{'lonDaemons'};
   45:     my $now=time;
   46:     my $local=localtime($now);
   47:     my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
   48:     print $fh "$local ($$): $message\n";
   49:     return 1;
   50: }
   51: 
   52: sub logperm {
   53:     my $message=shift;
   54:     my $execdir=$perlvar{'lonDaemons'};
   55:     my $now=time;
   56:     my $local=localtime($now);
   57:     my $fh=Apache::File->new(">>$execdir/logs/lonnet.perm.log");
   58:     print $fh "$now:$message:$local\n";
   59:     return 1;
   60: }
   61: 
   62: # -------------------------------------------------- Non-critical communication
   63: sub subreply {
   64:     my ($cmd,$server)=@_;
   65:     my $peerfile="$perlvar{'lonSockDir'}/$server";
   66:     my $client=IO::Socket::UNIX->new(Peer    =>"$peerfile",
   67:                                      Type    => SOCK_STREAM,
   68:                                      Timeout => 10)
   69:        or return "con_lost";
   70:     print $client "$cmd\n";
   71:     my $answer=<$client>;
   72:     if (!$answer) { $answer="con_lost"; }
   73:     chomp($answer);
   74:     return $answer;
   75: }
   76: 
   77: sub reply {
   78:     my ($cmd,$server)=@_;
   79:     my $answer=subreply($cmd,$server);
   80:     if ($answer eq 'con_lost') { $answer=subreply($cmd,$server); }
   81:     if (($answer=~/^error:/) || ($answer=~/^refused/) || 
   82:         ($answer=~/^rejected/)) {
   83:        &logthis("<font color=blue>WARNING:".
   84:                 " $cmd to $server returned $answer</font>");
   85:     }
   86:     return $answer;
   87: }
   88: 
   89: # ----------------------------------------------------------- Send USR1 to lonc
   90: 
   91: sub reconlonc {
   92:     my $peerfile=shift;
   93:     &logthis("Trying to reconnect for $peerfile");
   94:     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
   95:     if (my $fh=Apache::File->new("$loncfile")) {
   96: 	my $loncpid=<$fh>;
   97:         chomp($loncpid);
   98:         if (kill 0 => $loncpid) {
   99: 	    &logthis("lonc at pid $loncpid responding, sending USR1");
  100:             kill USR1 => $loncpid;
  101:             sleep 1;
  102:             if (-e "$peerfile") { return; }
  103:             &logthis("$peerfile still not there, give it another try");
  104:             sleep 5;
  105:             if (-e "$peerfile") { return; }
  106:             &logthis(
  107:   "<font color=blue>WARNING: $peerfile still not there, giving up</font>");
  108:         } else {
  109: 	    &logthis(
  110:                "<font color=blue>WARNING:".
  111:                " lonc at pid $loncpid not responding, giving up</font>");
  112:         }
  113:     } else {
  114:      &logthis('<font color=blue>WARNING: lonc not running, giving up</font>');
  115:     }
  116: }
  117: 
  118: # ------------------------------------------------------ Critical communication
  119: 
  120: sub critical {
  121:     my ($cmd,$server)=@_;
  122:     my $answer=reply($cmd,$server);
  123:     if ($answer eq 'con_lost') {
  124:         my $pingreply=reply('ping',$server);
  125: 	&reconlonc("$perlvar{'lonSockDir'}/$server");
  126:         my $pongreply=reply('pong',$server);
  127:         &logthis("Ping/Pong for $server: $pingreply/$pongreply");
  128:         $answer=reply($cmd,$server);
  129:         if ($answer eq 'con_lost') {
  130:             my $now=time;
  131:             my $middlename=$cmd;
  132:             $middlename=substr($middlename,0,16);
  133:             $middlename=~s/\W//g;
  134:             my $dfilename=
  135:              "$perlvar{'lonSockDir'}/delayed/$now.$middlename.$server";
  136:             {
  137:              my $dfh;
  138:              if ($dfh=Apache::File->new(">$dfilename")) {
  139:                 print $dfh "$cmd\n";
  140: 	     }
  141:             }
  142:             sleep 2;
  143:             my $wcmd='';
  144:             {
  145: 	     my $dfh;
  146:              if ($dfh=Apache::File->new("$dfilename")) {
  147:                 $wcmd=<$dfh>;
  148: 	     }
  149:             }
  150:             chomp($wcmd);
  151:             if ($wcmd eq $cmd) {
  152: 		&logthis("<font color=blue>WARNING: ".
  153:                          "Connection buffer $dfilename: $cmd</font>");
  154:                 &logperm("D:$server:$cmd");
  155: 	        return 'con_delayed';
  156:             } else {
  157:                 &logthis("<font color=red>CRITICAL:"
  158:                         ." Critical connection failed: $server $cmd</font>");
  159:                 &logperm("F:$server:$cmd");
  160:                 return 'con_failed';
  161:             }
  162:         }
  163:     }
  164:     return $answer;
  165: }
  166: 
  167: # ---------------------------------------------------------- Append Environment
  168: 
  169: sub appenv {
  170:     my %newenv=@_;
  171:     my @oldenv;
  172:     {
  173:      my $fh;
  174:      unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
  175: 	return 'error';
  176:      }
  177:      @oldenv=<$fh>;
  178:     }
  179:     for (my $i=0; $i<=$#oldenv; $i++) {
  180:         chomp($oldenv[$i]);
  181:         if ($oldenv[$i] ne '') {
  182:            my ($name,$value)=split(/=/,$oldenv[$i]);
  183: 	   $newenv{$name}=$value;
  184:         }
  185:     }
  186:     {
  187:      my $fh;
  188:      unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
  189: 	return 'error';
  190:      }
  191:      my $newname;
  192:      foreach $newname (keys %newenv) {
  193: 	 print $fh "$newname=$newenv{$newname}\n";
  194:      }
  195:     }
  196:     return 'ok';
  197: }
  198: 
  199: # ------------------------------ Find server with least workload from spare.tab
  200: 
  201: sub spareserver {
  202:     my $tryserver;
  203:     my $spareserver='';
  204:     my $lowestserver=100;
  205:     foreach $tryserver (keys %spareid) {
  206:        my $answer=reply('load',$tryserver);
  207:        if (($answer =~ /\d/) && ($answer<$lowestserver)) {
  208: 	   $spareserver="http://$hostname{$tryserver}";
  209:            $lowestserver=$answer;
  210:        }
  211:     }    
  212:     return $spareserver;
  213: }
  214: 
  215: # --------- Try to authenticate user from domain's lib servers (first this one)
  216: 
  217: sub authenticate {
  218:     my ($uname,$upass,$udom)=@_;
  219:     $upass=escape($upass);
  220:     if (($perlvar{'lonRole'} eq 'library') && 
  221:         ($udom eq $perlvar{'lonDefDomain'})) {
  222:     my $answer=reply("encrypt:auth:$udom:$uname:$upass",$perlvar{'lonHostID'});
  223:         if ($answer =~ /authorized/) {
  224:               if ($answer eq 'authorized') {
  225:                  &logthis("User $uname at $udom authorized by local server"); 
  226:                  return $perlvar{'lonHostID'}; 
  227:               }
  228:               if ($answer eq 'non_authorized') {
  229:                  &logthis("User $uname at $udom rejected by local server"); 
  230:                  return 'no_host'; 
  231:               }
  232: 	}
  233:     }
  234: 
  235:     my $tryserver;
  236:     foreach $tryserver (keys %libserv) {
  237: 	if ($hostdom{$tryserver} eq $udom) {
  238:            my $answer=reply("encrypt:auth:$udom:$uname:$upass",$tryserver);
  239:            if ($answer =~ /authorized/) {
  240:               if ($answer eq 'authorized') {
  241:                  &logthis("User $uname at $udom authorized by $tryserver"); 
  242:                  return $tryserver; 
  243:               }
  244:               if ($answer eq 'non_authorized') {
  245:                  &logthis("User $uname at $udom rejected by $tryserver");
  246:                  return 'no_host';
  247:               } 
  248: 	   }
  249:        }
  250:     }
  251:     &logthis("User $uname at $udom could not be authenticated");    
  252:     return 'no_host';
  253: }
  254: 
  255: # ---------------------- Find the homebase for a user from domain's lib servers
  256: 
  257: sub homeserver {
  258:     my ($uname,$udom)=@_;
  259: 
  260:     my $index="$uname:$udom";
  261:     if ($homecache{$index}) { return "$homecache{$index}"; }
  262: 
  263:     my $tryserver;
  264:     foreach $tryserver (keys %libserv) {
  265: 	if ($hostdom{$tryserver} eq $udom) {
  266:            my $answer=reply("home:$udom:$uname",$tryserver);
  267:            if ($answer eq 'found') { 
  268: 	      $homecache{$index}=$tryserver;
  269:               return $tryserver; 
  270: 	   }
  271:        }
  272:     }    
  273:     return 'no_host';
  274: }
  275: 
  276: # ----------------------------- Subscribe to a resource, return URL if possible
  277: 
  278: sub subscribe {
  279:     my $fname=shift;
  280:     my $author=$fname;
  281:     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
  282:     my ($udom,$uname)=split(/\//,$author);
  283:     my $home=homeserver($uname,$udom);
  284:     if (($home eq 'no_host') || ($home eq $perlvar{'lonHostID'})) { 
  285:         return 'not_found'; 
  286:     }
  287:     my $answer=reply("sub:$fname",$home);
  288:     return $answer;
  289: }
  290:     
  291: # -------------------------------------------------------------- Replicate file
  292: 
  293: sub repcopy {
  294:     my $filename=shift;
  295:     my $transname="$filename.in.transfer";
  296:     if ((-e $filename) || (-e $transname)) { return OK; }
  297:     my $remoteurl=subscribe($filename);
  298:     if ($remoteurl eq 'con_lost') {
  299: 	   &logthis("Subscribe returned con_lost: $filename");
  300:            return HTTP_SERVICE_UNAVAILABLE;
  301:     } elsif ($remoteurl eq 'not_found') {
  302: 	   &logthis("Subscribe returned not_found: $filename");
  303: 	   return HTTP_NOT_FOUND;
  304:     } elsif ($remoteurl eq 'rejected') {
  305: 	   &logthis("Subscribe returned rejected: $filename");
  306:            return FORBIDDEN;
  307:     } elsif ($remoteurl eq 'directory') {
  308:            return OK;
  309:     } else {
  310:            my @parts=split(/\//,$filename);
  311:            my $path="/$parts[1]/$parts[2]/$parts[3]/$parts[4]";
  312:            if ($path ne "$perlvar{'lonDocRoot'}/res") {
  313:                &logthis("Malconfiguration for replication: $filename");
  314: 	       return HTTP_BAD_REQUEST;
  315:            }
  316:            my $count;
  317:            for ($count=5;$count<$#parts;$count++) {
  318:                $path.="/$parts[$count]";
  319:                if ((-e $path)!=1) {
  320: 		   mkdir($path,0777);
  321:                }
  322:            }
  323:            my $ua=new LWP::UserAgent;
  324:            my $request=new HTTP::Request('GET',"$remoteurl");
  325:            my $response=$ua->request($request,$transname);
  326:            if ($response->is_error()) {
  327: 	       unlink($transname);
  328:                my $message=$response->status_line;
  329:                &logthis("<font color=blue>WARNING:"
  330:                        ." LWP get: $message: $filename</font>");
  331:                return HTTP_SERVICE_UNAVAILABLE;
  332:            } else {
  333: 	       if ($remoteurl!~/\.meta$/) {
  334:                   my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
  335:                   my $mresponse=$ua->request($mrequest,$filename.'.meta');
  336:                   if ($mresponse->is_error()) {
  337: 		      unlink($filename.'.meta');
  338:                       &logthis(
  339:                      "<font color=yellow>INFO: No metadata: $filename</font>");
  340:                   }
  341: 	       }
  342:                rename($transname,$filename);
  343:                return OK;
  344:            }
  345:     }
  346: }
  347: 
  348: # --------------------------------------------------------- Server Side Include
  349: 
  350: sub ssi {
  351: 
  352:     my $fn=shift;
  353: 
  354:     my $ua=new LWP::UserAgent;
  355:     my $request=new HTTP::Request('GET',"http://".$ENV{'HTTP_HOST'}.$fn);
  356:     $request->header(Cookie => $ENV{'HTTP_COOKIE'});
  357:     my $response=$ua->request($request);
  358: 
  359:     return $response->content;
  360: }
  361: 
  362: # ------------------------------------------------------------------------- Log
  363: 
  364: sub log {
  365:     my ($dom,$nam,$hom,$what)=@_;
  366:     return reply("log:$dom:$nam:$what",$hom);
  367: }
  368: 
  369: # ----------------------------------------------------------------------- Store
  370: 
  371: sub store {
  372:     my %storehash=shift;
  373:     my $namevalue='';
  374:     map {
  375:         $namevalue.=escape($_).'='.escape($storehash{$_}).'&';
  376:     } keys %storehash;
  377:     $namevalue=~s/\&$//;
  378:     return reply("store:$ENV{'user.domain'}:$ENV{'user.name'}:"
  379:                ."$ENV{'user.class'}:$ENV{'request.filename'}:$namevalue",
  380: 		 "$ENV{'user.home'}");
  381: }
  382: 
  383: # --------------------------------------------------------------------- Restore
  384: 
  385: sub restore {
  386:     my $answer=reply("restore:$ENV{'user.domain'}:$ENV{'user.name'}:"
  387:                ."$ENV{'user.class'}:$ENV{'request.filename'}",
  388:                 "$ENV{'user.home'}");
  389:     my %returnhash=();
  390:     map {
  391: 	my ($name,$value)=split(/\=/,$_);
  392:         $returnhash{&unescape($name)}=&unescape($value);
  393:     } split(/\&/,$answer);
  394:     return %returnhash;
  395: }
  396: 
  397: # -------------------------------------------------------- Get user priviledges
  398: 
  399: sub rolesinit {
  400:     my ($domain,$username,$authhost)=@_;
  401:     my $rolesdump=reply("dump:$domain:$username:roles",$authhost);
  402:     if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return ''; }
  403:     my %allroles=();
  404:     my %thesepriv=();
  405:     my $userroles='';
  406:     my $now=time;
  407:     my $thesestr;
  408: 
  409:     if ($rolesdump ne '') {
  410:         map {
  411: 	  if ($_!~/rolesdef\&/) {
  412:             my ($area,$role)=split(/=/,$_);
  413:             my ($trole,$tend,$tstart)=split(/_/,$role);
  414:             if ($tend!=0) {
  415: 	        if ($tend<$now) {
  416: 	            $trole='';
  417:                 } 
  418:             }
  419:             if ($tstart!=0) {
  420:                 if ($tstart>$now) {
  421:                    $trole='';        
  422:                 }
  423:             }
  424:             if (($area ne '') && ($trole ne '')) {
  425:                $userroles.='user.role.'.$trole.'.'.$area.'='.
  426:                            $tstart.'.'.$tend."\n";
  427:                my ($tdummy,$tdomain,$trest)=split(/\//,$area);
  428:                if ($trole =~ /^cr\//) {
  429: 		   my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$trole);
  430:                    my $homsvr=homeserver($rauthor,$rdomain);
  431:                    if ($hostname{$homsvr} ne '') {
  432:                       my $roledef=
  433: 			  reply("get:$rdomain:$rauthor:roles:rolesdef&$rrole",
  434:                                 $homsvr);
  435:                       if (($roledef ne 'con_lost') && ($roledef ne '')) {
  436:                          my ($syspriv,$dompriv,$coursepriv)=
  437: 			     split(/&&/,$roledef);
  438:  	                 $allroles{'/'}.=':'.$syspriv;
  439:                          if ($tdomain ne '') {
  440:                              $allroles{'/'.$tdomain.'/'}.=':'.$dompriv;
  441:                              if ($trest ne '') {
  442: 		                $allroles{$area}.=':'.$coursepriv;
  443:                              }
  444: 	                 }
  445:                       }
  446:                    }
  447:                } else {
  448: 	           $allroles{'/'}.=':'.$pr{$trole.':s'};
  449:                    if ($tdomain ne '') {
  450:                       $allroles{'/'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
  451:                       if ($trest ne '') {
  452: 		          $allroles{$area}.=':'.$pr{$trole.':c'};
  453:                       }
  454: 	           }
  455: 	       }
  456:             }
  457:           } 
  458:         } split(/&/,$rolesdump);
  459:         map {
  460:             %thesepriv=();
  461:             map {
  462:                 if ($_ ne '') {
  463: 		    my ($priviledge,$restrictions)=split(/&/,$_);
  464:                     if ($restrictions eq '') {
  465: 			$thesepriv{$priviledge}='F';
  466:                     } else {
  467:                         if ($thesepriv{$priviledge} ne 'F') {
  468: 			    $thesepriv{$priviledge}.=$restrictions;
  469:                         }
  470:                     }
  471:                 }
  472:             } split(/:/,$allroles{$_});
  473:             $thesestr='';
  474:             map { $thesestr.=':'.$_.'&'.$thesepriv{$_}; } keys %thesepriv;
  475:             $userroles.='user.priv.'.$_.'='.$thesestr."\n";
  476:         } keys %allroles;            
  477:     }
  478:     return $userroles;  
  479: }
  480: 
  481: # --------------------------------------------------------------- get interface
  482: 
  483: sub get {
  484:    my ($namespace,@storearr)=@_;
  485:    my $items='';
  486:    map {
  487:        $items.=escape($_).'&';
  488:    } @storearr;
  489:    $items=~s/\&$//;
  490:  my $rep=reply("get:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
  491:                  $ENV{'user.home'});
  492:    my @pairs=split(/\&/,$rep);
  493:    my %returnhash=();
  494:    map {
  495:       my ($key,$value)=split(/=/,$_);
  496:       $returnhash{unespace($key)}=unescape($value);
  497:    } @pairs;
  498:    return %returnhash;
  499: }
  500: 
  501: # -------------------------------------------------------------- dump interface
  502: 
  503: sub dump {
  504:    my $namespace=shift;
  505:    my $rep=reply("dump:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace",
  506:                 $ENV{'user.home'});
  507:    my @pairs=split(/\&/,$rep);
  508:    my %returnhash=();
  509:    map {
  510:       my ($key,$value)=split(/=/,$_);
  511:       $returnhash{unespace($key)}=unescape($value);
  512:    } @pairs;
  513:    return %returnhash;
  514: }
  515: 
  516: # --------------------------------------------------------------- put interface
  517: 
  518: sub put {
  519:    my ($namespace,%storehash)=@_;
  520:    my $items='';
  521:    map {
  522:        $items.=escape($_).'='.escape($storehash{$_}).'&';
  523:    } keys %storehash;
  524:    $items=~s/\&$//;
  525:    return reply("put:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
  526:                  $ENV{'user.home'});
  527: }
  528: 
  529: # -------------------------------------------------------------- eget interface
  530: 
  531: sub eget {
  532:    my ($namespace,@storearr)=@_;
  533:    my $items='';
  534:    map {
  535:        $items.=escape($_).'&';
  536:    } @storearr;
  537:    $items=~s/\&$//;
  538:  my $rep=reply("eget:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
  539:                  $ENV{'user.home'});
  540:    my @pairs=split(/\&/,$rep);
  541:    my %returnhash=();
  542:    map {
  543:       my ($key,$value)=split(/=/,$_);
  544:       $returnhash{unespace($key)}=unescape($value);
  545:    } @pairs;
  546:    return %returnhash;
  547: }
  548: 
  549: # ------------------------------------------------- Check for a user priviledge
  550: 
  551: sub allowed {
  552:     my ($priv,$uri)=@_;
  553:     $uri=~s/^\/res//;
  554:     $uri=~s/^\///;
  555:     if ($uri=~/^adm\//) {
  556: 	return 'F';
  557:     }
  558:     my $thisallowed='';
  559:     if ($ENV{'user.priv./'}=~/$priv\&([^\:]*)/) {
  560:        $thisallowed.=$1;
  561:     }
  562:     if ($ENV{'user.priv./'.(split(/\//,$uri))[0].'/'}=~/$priv\&([^\:]*)/) {
  563:        $thisallowed.=$1;
  564:     }
  565:     if ($ENV{'user.priv./'.$uri}=~/$priv\&([^\:]*)/) {
  566:        $thisallowed.=$1;
  567:     }
  568:     return $thisallowed;
  569: }
  570: 
  571: # ----------------------------------------------------------------- Define Role
  572: 
  573: sub definerole {
  574:   if (allowed('mcr','/')) {
  575:     my ($rolename,$sysrole,$domrole,$courole)=@_;
  576:     my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
  577:                 "$ENV{'user.domain'}:$ENV{'user.name'}:".
  578: 	        "rolesdef&$rolename=$sysrole&&$domrole&&$courole";
  579:     return reply($command,$ENV{'user.home'});
  580:   } else {
  581:     return 'refused';
  582:   }
  583: }
  584: 
  585: # ------------------------------------------------------------------ Plain Text
  586: 
  587: sub plaintext {
  588:     return $prp{$_};
  589: }
  590: 
  591: # ----------------------------------------------------------------- Assign Role
  592: 
  593: sub assignrole {
  594: }
  595: 
  596: # ------------------------------------------------------------ Directory lister
  597: 
  598: sub dirlist {
  599:     my $uri=shift;
  600:     $uri=~s/^\///;
  601:     $uri=~s/\/$//;
  602:     my ($res,$udom,$uname,@rest)=split(/\//,$uri);
  603:     if ($udom) {
  604:      if ($uname) {
  605:        my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/'.$uri,
  606:                       homeserver($uname,$udom));
  607:        return split(/:/,$listing);
  608:      } else {
  609:        my $tryserver;
  610:        my %allusers=();
  611:        foreach $tryserver (keys %libserv) {
  612: 	  if ($hostdom{$tryserver} eq $udom) {
  613:              my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.$udom,
  614: 			       $tryserver);
  615:              if (($listing ne 'no_such_dir') && ($listing ne 'empty')
  616:               && ($listing ne 'con_lost')) {
  617:                 map {
  618:                   my ($entry,@stat)=split(/&/,$_);
  619:                   $allusers{$entry}=1;
  620:                 } split(/:/,$listing);
  621:              }
  622: 	  }
  623:        }
  624:        my $alluserstr='';
  625:        map {
  626:            $alluserstr.=$_.'&user:';
  627:        } sort keys %allusers;
  628:        $alluserstr=~s/:$//;
  629:        return split(/:/,$alluserstr);
  630:      } 
  631:    } else {
  632:        my $tryserver;
  633:        my %alldom=();
  634:        foreach $tryserver (keys %libserv) {
  635: 	   $alldom{$hostdom{$tryserver}}=1;
  636:        }
  637:        my $alldomstr='';
  638:        map {
  639:           $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';
  640:        } sort keys %alldom;
  641:        $alldomstr=~s/:$//;
  642:        return split(/:/,$alldomstr);       
  643:    }
  644: }
  645: 
  646: # -------------------------------------------------------- Escape Special Chars
  647: 
  648: sub escape {
  649:     my $str=shift;
  650:     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
  651:     return $str;
  652: }
  653: 
  654: # ----------------------------------------------------- Un-Escape Special Chars
  655: 
  656: sub unescape {
  657:     my $str=shift;
  658:     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
  659:     return $str;
  660: }
  661: 
  662: # ================================================================ Main Program
  663: 
  664: sub BEGIN {
  665: if ($readit ne 'done') {
  666: # ------------------------------------------------------------ Read access.conf
  667: {
  668:     my $config=Apache::File->new("/etc/httpd/conf/access.conf");
  669: 
  670:     while (my $configline=<$config>) {
  671:         if ($configline =~ /PerlSetVar/) {
  672: 	   my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
  673:            chomp($varvalue);
  674:            $perlvar{$varname}=$varvalue;
  675:         }
  676:     }
  677: }
  678: 
  679: # ------------------------------------------------------------- Read hosts file
  680: {
  681:     my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");
  682: 
  683:     while (my $configline=<$config>) {
  684:        my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
  685:        $hostname{$id}=$name;
  686:        $hostdom{$id}=$domain;
  687:        if ($role eq 'library') { $libserv{$id}=$name; }
  688:     }
  689: }
  690: 
  691: # ------------------------------------------------------ Read spare server file
  692: {
  693:     my $config=Apache::File->new("$perlvar{'lonTabDir'}/spare.tab");
  694: 
  695:     while (my $configline=<$config>) {
  696:        chomp($configline);
  697:        if (($configline) && ($configline ne $perlvar{'lonHostID'})) {
  698:           $spareid{$configline}=1;
  699:        }
  700:     }
  701: }
  702: # ------------------------------------------------------------ Read permissions
  703: {
  704:     my $config=Apache::File->new("$perlvar{'lonTabDir'}/roles.tab");
  705: 
  706:     while (my $configline=<$config>) {
  707:        chomp($configline);
  708:        my ($role,$perm)=split(/ /,$configline);
  709:        if ($perm ne '') { $pr{$role}=$perm; }
  710:     }
  711: }
  712: 
  713: # -------------------------------------------- Read plain texts for permissions
  714: {
  715:     my $config=Apache::File->new("$perlvar{'lonTabDir'}/rolesplain.tab");
  716: 
  717:     while (my $configline=<$config>) {
  718:        chomp($configline);
  719:        my ($short,$plain)=split(/:/,$configline);
  720:        if ($plain ne '') { $prp{$short}=$plain; }
  721:     }
  722: }
  723: 
  724: $readit='done';
  725: &logthis('<font color=yellow>INFO: Read configuration</font>');
  726: }
  727: }
  728: 1;
  729: 
  730: 
  731: 
  732: 

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