loncom/lond - view - 1.178.2.22

File: [LON-CAPA] / loncom / lond
Revision 1.178.2.22: download - view: text, annotated - select for diffs
Tue May 4 10:09:38 2004 UTC (20 years ago) by foxr
Branches: Refactoring

History files/entries were getting made for nohist_ databases becuase like
an idiot I got the sense of the condition backwards.

1: #!/usr/bin/perl 2: # The LearningOnline Network 3: # lond "LON Daemon" Server (port "LOND" 5663) 4: # 5: # $Id: lond,v 1.178.2.22 2004/05/04 10:09:38 foxr Exp $ 6: # 7: # Copyright Michigan State University Board of Trustees 8: # 9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA). 10: # 11: # LON-CAPA is free software; you can redistribute it and/or modify 12: # it under the terms of the GNU General Public License as published by 13: # the Free Software Foundation; either version 2 of the License, or 14: # (at your option) any later version. 15: # 16: # LON-CAPA is distributed in the hope that it will be useful, 17: # but WITHOUT ANY WARRANTY; without even the implied warranty of 18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19: # GNU General Public License for more details. 20: # 21: # You should have received a copy of the GNU General Public License 22: # along with LON-CAPA; if not, write to the Free Software 23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 24: # 25: # /home/httpd/html/adm/gpl.txt 26: # 27: 28: 29: # http://www.lon-capa.org/ 30: # 31: 32: use strict; 33: use lib '/home/httpd/lib/perl/'; 34: use LONCAPA::Configuration; 35: 36: use IO::Socket; 37: use IO::File; 38: #use Apache::File; 39: use Symbol; 40: use POSIX; 41: use Crypt::IDEA; 42: use LWP::UserAgent(); 43: use GDBM_File; 44: use Authen::Krb4; 45: use Authen::Krb5; 46: use lib '/home/httpd/lib/perl/'; 47: use localauth; 48: use File::Copy; 49: use LONCAPA::ConfigFileEdit; 50: 51: my $DEBUG = 1; # Non zero to enable debug log entries. 52: 53: my $status=''; 54: my $lastlog=''; 55: 56: my $VERSION='$Revision: 1.178.2.22 $'; #' stupid emacs 57: my $remoteVERSION; 58: my $currenthostid; 59: my $currentdomainid; 60: 61: my $client; 62: my $clientip; 63: my $clientname; 64: 65: my $cipher; # Cipher key negotiated with client. 66: my $tmpsnum = 0;; # Id of tmpputs. 67: 68: my $server; 69: my $thisserver; 70: 71: # 72: # Connection type is: 73: # client - All client actions are allowed 74: # manager - only management functions allowed. 75: # both - Both management and client actions are allowed 76: # 77: 78: my $ConnectionType; 79: 80: my %hostid; 81: my %hostdom; 82: my %hostip; 83: 84: my %managers; # Ip -> manager names 85: 86: my %perlvar; # Will have the apache conf defined perl vars. 87: 88: # 89: # The hash below is used for command dispatching, and is therefore keyed on the request keyword. 90: # Each element of the hash contains a reference to an array that contains: 91: # A reference to a sub that executes the request corresponding to the keyword. 92: # A flag that is true if the request must be encoded to be acceptable. 93: # A mask with bits as follows: 94: # CLIENT_OK - Set when the function is allowed by ordinary clients 95: # MANAGER_OK - Set when the function is allowed to manager clients. 96: # 97: my $CLIENT_OK = 1; 98: my $MANAGER_OK = 2; 99: my %Dispatcher; 100: 101: # 102: # The array below are password error strings." 103: # 104: my $lastpwderror = 13; # Largest error number from lcpasswd. 105: my @passwderrors = ("ok", 106: "lcpasswd must be run as user 'www'", 107: "lcpasswd got incorrect number of arguments", 108: "lcpasswd did not get the right nubmer of input text lines", 109: "lcpasswd too many simultaneous pwd changes in progress", 110: "lcpasswd User does not exist.", 111: "lcpasswd Incorrect current passwd", 112: "lcpasswd Unable to su to root.", 113: "lcpasswd Cannot set new passwd.", 114: "lcpasswd Username has invalid characters", 115: "lcpasswd Invalid characters in password", 116: "11", "12", 117: "lcpasswd Password mismatch"); 118: 119: 120: # The array below are lcuseradd error strings.: 121: 122: my $lastadderror = 13; 123: my @adderrors = ("ok", 124: "User ID mismatch, lcuseradd must run as user www", 125: "lcuseradd Incorrect number of command line parameters must be 3", 126: "lcuseradd Incorrect number of stdinput lines, must be 3", 127: "lcuseradd Too many other simultaneous pwd changes in progress", 128: "lcuseradd User does not exist", 129: "lcuseradd Unable to make www member of users's group", 130: "lcuseradd Unable to su to root", 131: "lcuseradd Unable to set password", 132: "lcuseradd Usrname has invalid characters", 133: "lcuseradd Password has an invalid character", 134: "lcuseradd User already exists", 135: "lcuseradd Could not add user.", 136: "lcuseradd Password mismatch"); 137: 138: # 139: # Statistics that are maintained and dislayed in the status line. 140: # 141: my $Transactions; # Number of attempted transactions. 142: my $Failures; # Number of transcations failed. 143: 144: # ResetStatistics: 145: # Resets the statistics counters: 146: # 147: sub ResetStatistics { 148: $Transactions = 0; 149: $Failures = 0; 150: } 151: 152: # 153: # Return true if client is a manager. 154: # 155: sub isManager { 156: return (($ConnectionType eq "manager") || ($ConnectionType eq "both")); 157: } 158: # 159: # Return tru if client can do client functions 160: # 161: sub isClient { 162: return (($ConnectionType eq "client") || ($ConnectionType eq "both")); 163: } 164: # 165: # Ties a domain level resource file to a hash. 166: # If requested a history entry is created in the associated hist file. 167: # 168: # Parameters: 169: # domain - Name of the domain in which the resource file lives. 170: # namespace - Name of the hash within that domain. 171: # how - How to tie the hash (e.g. GDBM_WRCREAT()). 172: # loghead - Optional parameter, if present a log entry is created 173: # in the associated history file and this is the first part 174: # of that entry. 175: # logtail - Goes along with loghead, The actual logentry is of the 176: # form $loghead:<timestamp>:logtail. 177: # Returns: 178: # Reference to a hash bound to the db file or alternatively undef 179: # if the tie failed. 180: # 181: sub TieDomainHash { 182: my $domain = shift; 183: my $namespace = shift; 184: my $how = shift; 185: 186: # Filter out any whitespace in the domain name: 187: 188: $domain =~ s/\W//g; 189: 190: # We have enough to go on to tie the hash: 191: 192: my $UserTopDir = $perlvar{'lonUsersDir'}; 193: my $DomainDir = $UserTopDir."/$domain"; 194: my $ResourceFile = $DomainDir."/$namespace.db"; 195: my %hash; 196: if(tie(%hash, 'GDBM_File', $ResourceFile, $how, 0640)) { 197: if (scalar @_) { # Need to log the operation. 198: my $logFh = IO::File->new(">>$DomainDir/$namespace.hist"); 199: if($logFh) { 200: my $TimeStamp = time; 201: my ($loghead, $logtail) = @_; 202: print $logFh "$loghead:$TimeStamp:$logtail\n"; 203: } 204: } 205: return \%hash; # Return the tied hash. 206: } 207: else { 208: return undef; # Tie failed. 209: } 210: } 211: 212: # 213: # Ties a user's resource file to a hash. 214: # If necessary, an appropriate history 215: # log file entry is made as well. 216: # This sub factors out common code from the subs that manipulate 217: # the various gdbm files that keep keyword value pairs. 218: # Parameters: 219: # domain - Name of the domain the user is in. 220: # user - Name of the 'current user'. 221: # namespace - Namespace representing the file to tie. 222: # how - What the tie is done to (e.g. GDBM_WRCREAT(). 223: # loghead - Optional first part of log entry if there may be a 224: # history file. 225: # what - Optional tail of log entry if there may be a history 226: # file. 227: # Returns: 228: # hash to which the database is tied. It's up to the caller to untie. 229: # undef if the has could not be tied. 230: # 231: sub TieUserHash { 232: my $domain = shift; 233: my $user = shift; 234: my $namespace = shift; 235: my $how = shift; 236: 237: $namespace=~s/\//\_/g; # / -> _ 238: $namespace=~s/\W//g; # whitespace eliminated. 239: my $proname = propath($domain, $user); 240: 241: # If this is a namespace for which a history is kept, 242: # make the history log entry: 243: 244: 245: if (($namespace =~/^nohist\_/) && (scalar @_ > 0)) { 246: my $args = scalar @_; 247: Debug(" Opening history: $namespace $args"); 248: my $hfh = IO::File->new(">>$proname/$namespace.hist"); 249: if($hfh) { 250: my $now = time; 251: my $loghead = shift; 252: my $what = shift; 253: print $hfh "$loghead:$now:$what\n"; 254: } 255: } 256: # Tie the database. 257: 258: my %hash; 259: if(tie(%hash, 'GDBM_File', "$proname/$namespace.db", 260: $how, 0640)) { 261: return \%hash; 262: } 263: else { 264: return undef; 265: } 266: 267: } 268: 269: # 270: # Get a Request: 271: # Gets a Request message from the client. The transaction 272: # is defined as a 'line' of text. We remove the new line 273: # from the text line. 274: # 275: sub GetRequest { 276: my $input = <$client>; 277: chomp($input); 278: 279: Debug("Request = $input\n"); 280: 281: &status('Processing '.$clientname.':'.$input); 282: 283: return $input; 284: } 285: # 286: # Decipher encoded traffic 287: # Parameters: 288: # input - Encoded data. 289: # Returns: 290: # Decoded data or undef if encryption key was not yet negotiated. 291: # Implicit input: 292: # cipher - This global holds the negotiated encryption key. 293: # 294: sub Decipher { 295: my $input = shift; 296: my $output = ''; 297: 298: 299: if($cipher) { 300: my($enc, $enclength, $encinput) = split(/:/, $input); 301: for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) { 302: $output .= 303: $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16))); 304: } 305: return substr($output, 0, $enclength); 306: } else { 307: return undef; 308: } 309: } 310: 311: # 312: # Register a command processor. This function is invoked to register a sub 313: # to process a request. Once registered, the ProcessRequest sub can automatically 314: # dispatch requests to an appropriate sub, and do the top level validity checking 315: # as well: 316: # - Is the keyword recognized. 317: # - Is the proper client type attempting the request. 318: # - Is the request encrypted if it has to be. 319: # Parameters: 320: # $RequestName - Name of the request being registered. 321: # This is the command request that will match 322: # against the hash keywords to lookup the information 323: # associated with the dispatch information. 324: # $Procedure - Reference to a sub to call to process the request. 325: # All subs get called as follows: 326: # Procedure($cmd, $tail, $replyfd, $key) 327: # $cmd - the actual keyword that invoked us. 328: # $tail - the tail of the request that invoked us. 329: # $replyfd- File descriptor connected to the client 330: # $MustEncode - True if the request must be encoded to be good. 331: # $ClientOk - True if it's ok for a client to request this. 332: # $ManagerOk - True if it's ok for a manager to request this. 333: # Side effects: 334: # - On success, the Dispatcher hash has an entry added for the key $RequestName 335: # - On failure, the program will die as it's a bad internal bug to try to 336: # register a duplicate command handler. 337: # 338: sub RegisterHandler { 339: my $RequestName = shift; 340: my $Procedure = shift; 341: my $MustEncode = shift; 342: my $ClientOk = shift; 343: my $ManagerOk = shift; 344: 345: # Don't allow duplication# 346: 347: if (defined $Dispatcher{$RequestName}) { 348: die "Attempting to define a duplicate request handler for $RequestName\n"; 349: } 350: # Build the client type mask: 351: 352: my $ClientTypeMask = 0; 353: if($ClientOk) { 354: $ClientTypeMask |= $CLIENT_OK; 355: } 356: if($ManagerOk) { 357: $ClientTypeMask |= $MANAGER_OK; 358: } 359: 360: # Enter the hash: 361: 362: my @entry = ($Procedure, $MustEncode, $ClientTypeMask); 363: 364: $Dispatcher{$RequestName} = \@entry; 365: 366: 367: } 368: 369: #--------------------- Request Handlers -------------------------------------------- 370: # 371: # By convention each request handler registers itself prior to the sub declaration: 372: # 373: 374: # Handles ping requests. 375: # Parameters: 376: # $cmd - the actual keyword that invoked us. 377: # $tail - the tail of the request that invoked us. 378: # $replyfd- File descriptor connected to the client 379: # Implicit Inputs: 380: # $currenthostid - Global variable that carries the name of the host we are 381: # known as. 382: # Returns: 383: # 1 - Ok to continue processing. 384: # 0 - Program should exit. 385: # Side effects: 386: # Reply information is sent to the client. 387: 388: sub PingHandler { 389: my $cmd = shift; 390: my $tail = shift; 391: my $client = shift; 392: 393: Reply( $client,"$currenthostid\n","$cmd:$tail"); 394: 395: return 1; 396: } 397: RegisterHandler("ping", \&PingHandler, 0, 1, 1); # Ping unencoded, client or manager. 398: # 399: # Handles pong reequests: 400: # Parameters: 401: # $cmd - the actual keyword that invoked us. 402: # $tail - the tail of the request that invoked us. 403: # $replyfd- File descriptor connected to the client 404: # Implicit Inputs: 405: # $currenthostid - Global variable that carries the name of the host we are 406: # connected to. 407: # Returns: 408: # 1 - Ok to continue processing. 409: # 0 - Program should exit. 410: # Side effects: 411: # Reply information is sent to the client. 412: 413: sub PongHandler { 414: my $cmd = shift; 415: my $tail = shift; 416: my $replyfd = shift; 417: 418: my $reply=&reply("ping",$clientname); 419: Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 420: return 1; 421: } 422: RegisterHandler("pong", \&PongHandler, 0, 1, 1); # Pong unencoded, client or manager 423: 424: # 425: # EstablishKeyHandler: 426: # Called to establish an encrypted session key with the remote client. 427: # 428: # Parameters: 429: # $cmd - the actual keyword that invoked us. 430: # $tail - the tail of the request that invoked us. 431: # $replyfd- File descriptor connected to the client 432: # Implicit Inputs: 433: # $currenthostid - Global variable that carries the name of the host 434: # known as. 435: # $clientname - Global variable that carries the name of the hsot we're connected to. 436: # Returns: 437: # 1 - Ok to continue processing. 438: # 0 - Program should exit. 439: # Implicit Outputs: 440: # Reply information is sent to the client. 441: # $cipher is set with a reference to a new IDEA encryption object. 442: # 443: sub EstablishKeyHandler { 444: my $cmd = shift; 445: my $tail = shift; 446: my $replyfd = shift; 447: 448: my $buildkey=time.$$.int(rand 100000); 449: $buildkey=~tr/1-6/A-F/; 450: $buildkey=int(rand 100000).$buildkey.int(rand 100000); 451: my $key=$currenthostid.$clientname; 452: $key=~tr/a-z/A-Z/; 453: $key=~tr/G-P/0-9/; 454: $key=~tr/Q-Z/0-9/; 455: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey; 456: $key=substr($key,0,32); 457: my $cipherkey=pack("H32",$key); 458: $cipher=new IDEA $cipherkey; 459: Reply($replyfd, "$buildkey\n", "$cmd:$tail"); 460: 461: return 1; 462: 463: } 464: RegisterHandler("ekey", \&EstablishKeyHandler, 0, 1,1); 465: 466: # LoadHandler: 467: # Handler for the load command. Returns the current system load average 468: # to the requestor. 469: # 470: # Parameters: 471: # $cmd - the actual keyword that invoked us. 472: # $tail - the tail of the request that invoked us. 473: # $replyfd- File descriptor connected to the client 474: # Implicit Inputs: 475: # $currenthostid - Global variable that carries the name of the host 476: # known as. 477: # $clientname - Global variable that carries the name of the hsot we're connected to. 478: # Returns: 479: # 1 - Ok to continue processing. 480: # 0 - Program should exit. 481: # Side effects: 482: # Reply information is sent to the client. 483: sub LoadHandler { 484: my $cmd = shift; 485: my $tail = shift; 486: my $replyfd = shift; 487: 488: # Get the load average from /proc/loadavg and calculate it as a percentage of 489: # the allowed load limit as set by the perl global variable lonLoadLim 490: 491: my $loadavg; 492: my $loadfile=IO::File->new('/proc/loadavg'); 493: 494: $loadavg=<$loadfile>; 495: $loadavg =~ s/\s.*//g; # Extract the first field only. 496: 497: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'}; 498: 499: Reply( $replyfd, "$loadpercent\n", "$cmd:$tail"); 500: 501: return 1; 502: } 503: RegisterHandler("load", \&LoadHandler, 0, 1, 0); 504: 505: 506: # 507: # Process the userload request. This sub returns to the client the current 508: # user load average. It can be invoked either by clients or managers. 509: # 510: # Parameters: 511: # $cmd - the actual keyword that invoked us. 512: # $tail - the tail of the request that invoked us. 513: # $replyfd- File descriptor connected to the client 514: # Implicit Inputs: 515: # $currenthostid - Global variable that carries the name of the host 516: # known as. 517: # $clientname - Global variable that carries the name of the hsot we're connected to. 518: # Returns: 519: # 1 - Ok to continue processing. 520: # 0 - Program should exit 521: # Implicit inputs: 522: # whatever the userload() function requires. 523: # Implicit outputs: 524: # the reply is written to the client. 525: # 526: sub UserLoadHandler { 527: my $cmd = shift; 528: my $tail = shift; 529: my $replyfd = shift; 530: 531: my $userloadpercent=&userload(); 532: Reply($replyfd, "$userloadpercent\n", "$cmd:$tail"); 533: 534: return 1; 535: } 536: RegisterHandler("userload", \&UserLoadHandler, 0, 1, 0); 537: 538: # Process a request for the authorization type of a user: 539: # (userauth). 540: # 541: # Parameters: 542: # $cmd - the actual keyword that invoked us. 543: # $tail - the tail of the request that invoked us. 544: # $replyfd- File descriptor connected to the client 545: # Returns: 546: # 1 - Ok to continue processing. 547: # 0 - Program should exit 548: # Implicit outputs: 549: # The user authorization type is written to the client. 550: # 551: sub UserAuthorizationType { 552: my $cmd = shift; 553: my $tail = shift; 554: my $replyfd = shift; 555: 556: my $userinput = "$cmd:$tail"; 557: 558: # Pull the domain and username out of the command tail. 559: # and call GetAuthType to determine the authentication type. 560: 561: my ($udom,$uname)=split(/:/,$tail); 562: my $result = GetAuthType($udom, $uname); 563: if($result eq "nouser") { 564: Failure( $replyfd, "unknown_user\n", $userinput); 565: } else { 566: # 567: # We only want to pass the second field from GetAuthType 568: # for ^krb.. otherwise we'll be handing out the encrypted 569: # password for internals e.g. 570: # 571: my ($type,$otherinfo) = split(/:/,$result); 572: if($type =~ /^krb/) { 573: $type = $result; 574: } 575: Reply( $replyfd, "$type\n", $userinput); 576: } 577: 578: return 1; 579: } 580: RegisterHandler("currentauth", \&UserAuthorizationType, 1, 1, 0); 581: # 582: # Process a request by a manager to push a hosts or domain table 583: # to us. We pick apart the command and pass it on to the subs 584: # that already exist to do this. 585: # 586: # Parameters: 587: # $cmd - the actual keyword that invoked us. 588: # $tail - the tail of the request that invoked us. 589: # $client - File descriptor connected to the client 590: # Returns: 591: # 1 - Ok to continue processing. 592: # 0 - Program should exit 593: # Implicit Output: 594: # a reply is written to the client. 595: 596: sub PushFileHandler { 597: my $cmd = shift; 598: my $tail = shift; 599: my $client = shift; 600: 601: my $userinput = "$cmd:$tail"; 602: 603: # At this time we only know that the IP of our partner is a valid manager 604: # the code below is a hook to do further authentication (e.g. to resolve 605: # spoofing). 606: 607: my $cert = GetCertificate($userinput); 608: if(ValidManager($cert)) { 609: 610: # Now presumably we have the bona fides of both the peer host and the 611: # process making the request. 612: 613: my $reply = PushFile($userinput); 614: Reply($client, "$reply\n", $userinput); 615: 616: } else { 617: Failure( $client, "refused\n", $userinput); 618: } 619: } 620: RegisterHandler("pushfile", \&PushFileHandler, 1, 0, 1); 621: 622: 623: 624: # Process a reinit request. Reinit requests that either 625: # lonc or lond be reinitialized so that an updated 626: # host.tab or domain.tab can be processed. 627: # 628: # Parameters: 629: # $cmd - the actual keyword that invoked us. 630: # $tail - the tail of the request that invoked us. 631: # $client - File descriptor connected to the client 632: # Returns: 633: # 1 - Ok to continue processing. 634: # 0 - Program should exit 635: # Implicit output: 636: # a reply is sent to the client. 637: # 638: sub ReinitProcessHandler { 639: my $cmd = shift; 640: my $tail = shift; 641: my $client = shift; 642: 643: my $userinput = "$cmd:$tail"; 644: 645: my $cert = GetCertificate($userinput); 646: if(ValidManager($cert)) { 647: chomp($userinput); 648: my $reply = ReinitProcess($userinput); 649: Reply( $client, "$reply\n", $userinput); 650: } else { 651: Failure( $client, "refused\n", $userinput); 652: } 653: return 1; 654: } 655: 656: RegisterHandler("reinit", \&ReinitProcessHandler, 1, 0, 1); 657: 658: # Process the editing script for a table edit operation. 659: # the editing operation must be encrypted and requested by 660: # a manager host. 661: # 662: # Parameters: 663: # $cmd - the actual keyword that invoked us. 664: # $tail - the tail of the request that invoked us. 665: # $client - File descriptor connected to the client 666: # Returns: 667: # 1 - Ok to continue processing. 668: # 0 - Program should exit 669: # Implicit output: 670: # a reply is sent to the client. 671: # 672: sub EditTableHandler { 673: my $command = shift; 674: my $tail = shift; 675: my $client = shift; 676: 677: my $userinput = "$command:$tail"; 678: 679: my $cert = GetCertificate($userinput); 680: if(ValidManager($cert)) { 681: my($filetype, $script) = split(/:/, $tail); 682: if (($filetype eq "hosts") || 683: ($filetype eq "domain")) { 684: if($script ne "") { 685: Reply($client, # BUGBUG - EditFile 686: EditFile($userinput), # could fail. 687: $userinput); 688: } else { 689: Failure($client,"refused\n",$userinput); 690: } 691: } else { 692: Failure($client,"refused\n",$userinput); 693: } 694: } else { 695: Failure($client,"refused\n",$userinput); 696: } 697: return 1; 698: } 699: RegisterHandler("edit", \&EditTableHandler, 1, 0, 1); 700: 701: 702: # 703: # Authenticate a user against the LonCAPA authentication 704: # database. Note that there are several authentication 705: # possibilities: 706: # - unix - The user can be authenticated against the unix 707: # password file. 708: # - internal - The user can be authenticated against a purely 709: # internal per user password file. 710: # - kerberos - The user can be authenticated against either a kerb4 or kerb5 711: # ticket granting authority. 712: # - user - The person tailoring LonCAPA can supply a user authentication 713: # mechanism that is per system. 714: # 715: # Parameters: 716: # $cmd - The command that got us here. 717: # $tail - Tail of the command (remaining parameters). 718: # $client - File descriptor connected to client. 719: # Returns 720: # 0 - Requested to exit, caller should shut down. 721: # 1 - Continue processing. 722: # Implicit inputs: 723: # The authentication systems describe above have their own forms of implicit 724: # input into the authentication process that are described above. 725: # 726: sub AuthenticateHandler { 727: my $cmd = shift; 728: my $tail = shift; 729: my $client = shift; 730: 731: # Regenerate the full input line 732: 733: my $userinput = $cmd.":".$tail; 734: 735: # udom - User's domain. 736: # uname - Username. 737: # upass - User's password. 738: 739: my ($udom,$uname,$upass)=split(/:/,$tail); 740: Debug(" Authenticate domain = $udom, user = $uname, password = $upass"); 741: chomp($upass); 742: $upass=unescape($upass); 743: 744: my $pwdcorrect = ValidateUser($udom, $uname, $upass); 745: if($pwdcorrect) { 746: Reply( $client, "authorized\n", $userinput); 747: # 748: # Bad credentials: Failed to authorize 749: # 750: } else { 751: Failure( $client, "non_authorized\n", $userinput); 752: } 753: 754: return 1; 755: } 756: RegisterHandler("auth", \&AuthenticateHandler, 1, 1, 0); 757: 758: # 759: # Change a user's password. Note that this function is complicated by 760: # the fact that a user may be authenticated in more than one way: 761: # At present, we are not able to change the password for all types of 762: # authentication methods. Only for: 763: # unix - unix password or shadow passoword style authentication. 764: # local - Locally written authentication mechanism. 765: # For now, kerb4 and kerb5 password changes are not supported and result 766: # in an error. 767: # FUTURE WORK: 768: # Support kerberos passwd changes? 769: # Parameters: 770: # $cmd - The command that got us here. 771: # $tail - Tail of the command (remaining parameters). 772: # $client - File descriptor connected to client. 773: # Returns 774: # 0 - Requested to exit, caller should shut down. 775: # 1 - Continue processing. 776: # Implicit inputs: 777: # The authentication systems describe above have their own forms of implicit 778: # input into the authentication process that are described above. 779: sub ChangePasswordHandler { 780: my $cmd = shift; 781: my $tail = shift; 782: my $client = shift; 783: 784: my $userinput = $cmd.":".$tail; # Reconstruct client's string. 785: 786: # 787: # udom - user's domain. 788: # uname - Username. 789: # upass - Current password. 790: # npass - New password. 791: 792: my ($udom,$uname,$upass,$npass)=split(/:/,$tail); 793: 794: $upass=&unescape($upass); 795: $npass=&unescape($npass); 796: &Debug("Trying to change password for $uname"); 797: 798: # First require that the user can be authenticated with their 799: # old password: 800: 801: my $validated = ValidateUser($udom, $uname, $upass); 802: if($validated) { 803: my $realpasswd = GetAuthType($udom, $uname); # Defined since authd. 804: 805: my ($howpwd,$contentpwd)=split(/:/,$realpasswd); 806: if ($howpwd eq 'internal') { 807: &Debug("internal auth"); 808: my $salt=time; 809: $salt=substr($salt,6,2); 810: my $ncpass=crypt($npass,$salt); 811: if(RewritePwFile($udom, $uname, "internal:$ncpass")) { 812: &logthis("Result of password change for " 813: ."$uname: pwchange_success"); 814: Reply($client, "ok\n", $userinput); 815: } else { 816: &logthis("Unable to open $uname passwd " 817: ."to change password"); 818: Failure( $client, "non_authorized\n",$userinput); 819: } 820: } elsif ($howpwd eq 'unix') { 821: # Unix means we have to access /etc/password 822: &Debug("auth is unix"); 823: my $execdir=$perlvar{'lonDaemons'}; 824: &Debug("Opening lcpasswd pipeline"); 825: my $pf = IO::File->new("|$execdir/lcpasswd > " 826: ."$perlvar{'lonDaemons'}" 827: ."/logs/lcpasswd.log"); 828: print $pf "$uname\n$npass\n$npass\n"; 829: close $pf; 830: my $err = $?; 831: my $result = ($err>0 ? 'pwchange_failure' : 'ok'); 832: &logthis("Result of password change for $uname: ". 833: &lcpasswdstrerror($?)); 834: Reply($client, "$result\n", $userinput); 835: } else { 836: # this just means that the current password mode is not 837: # one we know how to change (e.g the kerberos auth modes or 838: # locally written auth handler). 839: # 840: Reply( $client, "auth_mode_error\n", $userinput); 841: } 842: 843: } 844: else { 845: Reply( $client, "non_authorized\n", $userinput); 846: } 847: 848: return 1; 849: } 850: RegisterHandler("passwd", \&ChangePasswordHandler, 1, 1, 0); 851: 852: # 853: # Create a new user. User in this case means a lon-capa user. 854: # The user must either already exist in some authentication realm 855: # like kerberos or the /etc/passwd. If not, a user completely local to 856: # this loncapa system is created. 857: # 858: # Parameters: 859: # $cmd - The command that got us here. 860: # $tail - Tail of the command (remaining parameters). 861: # $client - File descriptor connected to client. 862: # Returns 863: # 0 - Requested to exit, caller should shut down. 864: # 1 - Continue processing. 865: # Implicit inputs: 866: # The authentication systems describe above have their own forms of implicit 867: # input into the authentication process that are described above. 868: sub AddUserHandler { 869: my $cmd = shift; 870: my $tail = shift; 871: my $client = shift; 872: 873: my ($udom,$uname,$umode,$npass)=split(/:/,$tail); 874: my $userinput = $cmd.":".$tail; # Reconstruct the full request line. 875: 876: &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname); 877: 878: 879: if($udom eq $currentdomainid) { # Reject new users for other domains... 880: 881: my $oldumask=umask(0077); 882: chomp($npass); 883: $npass=&unescape($npass); 884: my $passfilename = PasswordPath($udom, $uname); 885: &Debug("Password file created will be:".$passfilename); 886: if (-e $passfilename) { 887: Failure( $client, "already_exists\n", $userinput); 888: } else { 889: my @fpparts=split(/\//,$passfilename); 890: my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2]; 891: my $fperror=''; 892: for (my $i=3;$i<= ($#fpparts-1);$i++) { 893: $fpnow.='/'.$fpparts[$i]; 894: unless (-e $fpnow) { 895: &logthis("mkdir $fpnow"); 896: unless (mkdir($fpnow,0777)) { 897: $fperror="error: ".($!+0)." mkdir failed while attempting " 898: ."makeuser"; 899: } 900: } 901: } 902: unless ($fperror) { 903: my $result=&make_passwd_file($uname, $umode,$npass, $passfilename); 904: Reply($client, $result, $userinput); #BUGBUG - could be fail 905: } else { 906: Failure($client, "$fperror\n", $userinput); 907: } 908: } 909: umask($oldumask); 910: } else { 911: Failure($client, "not_right_domain\n", 912: $userinput); # Even if we are multihomed. 913: 914: } 915: return 1; 916: 917: } 918: RegisterHandler("makeuser", \&AddUserHandler, 1, 1, 0); 919: 920: # 921: # Change the authentication method of a user. Note that this may 922: # also implicitly change the user's password if, for example, the user is 923: # joining an existing authentication realm. Known authentication realms at 924: # this time are: 925: # internal - Purely internal password file (only loncapa knows this user) 926: # local - Institutionally written authentication module. 927: # unix - Unix user (/etc/passwd with or without /etc/shadow). 928: # kerb4 - kerberos version 4 929: # kerb5 - kerberos version 5 930: # 931: # Parameters: 932: # $cmd - The command that got us here. 933: # $tail - Tail of the command (remaining parameters). 934: # $client - File descriptor connected to client. 935: # Returns 936: # 0 - Requested to exit, caller should shut down. 937: # 1 - Continue processing. 938: # Implicit inputs: 939: # The authentication systems describe above have their own forms of implicit 940: # input into the authentication process that are described above. 941: # 942: sub ChangeAuthenticationHandler { 943: my $cmd = shift; 944: my $tail = shift; 945: my $client = shift; 946: 947: my $userinput = "$cmd:$tail"; # Reconstruct user input. 948: 949: my ($udom,$uname,$umode,$npass)=split(/:/,$tail); 950: &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode); 951: if ($udom ne $currentdomainid) { 952: Failure( $client, "not_right_domain\n", $client); 953: } else { 954: 955: chomp($npass); 956: 957: $npass=&unescape($npass); 958: my $passfilename = PasswordPath($udom, $uname); 959: if ($passfilename) { # Not allowed to create a new user!! 960: my $result=&make_passwd_file($uname, $umode,$npass,$passfilename); 961: Reply($client, $result, $userinput); 962: } else { 963: Failure($client, "non_authorized", $userinput); # Fail the user now. 964: } 965: } 966: return 1; 967: } 968: RegisterHandler("changeuserauth", \&ChangeAuthenticationHandler, 1,1, 0); 969: 970: # 971: # Determines if this is the home server for a user. The home server 972: # for a user will have his/her lon-capa passwd file. Therefore all we need 973: # to do is determine if this file exists. 974: # 975: # Parameters: 976: # $cmd - The command that got us here. 977: # $tail - Tail of the command (remaining parameters). 978: # $client - File descriptor connected to client. 979: # Returns 980: # 0 - Requested to exit, caller should shut down. 981: # 1 - Continue processing. 982: # Implicit inputs: 983: # The authentication systems describe above have their own forms of implicit 984: # input into the authentication process that are described above. 985: # 986: sub IsHomeHandler { 987: my $cmd = shift; 988: my $tail = shift; 989: my $client = shift; 990: 991: my $userinput = "$cmd:$tail"; 992: 993: my ($udom,$uname)=split(/:/,$tail); 994: chomp($uname); 995: my $passfile = PasswordFilename($udom, $uname); 996: if($passfile) { 997: Reply( $client, "found\n", $userinput); 998: } else { 999: Failure($client, "not_found\n", $userinput); 1000: } 1001: return 1; 1002: } 1003: RegisterHandler("home", \&IsHomeHandler, 0,1,0); 1004: # 1005: # Process an update request for a resource?? I think what's going on here is 1006: # that a resource has been modified that we hold a subscription to. 1007: # If the resource is not local, then we must update, or at least invalidate our 1008: # cached copy of the resource. 1009: # FUTURE WORK: 1010: # I need to look at this logic carefully. My druthers would be to follow 1011: # typical caching logic, and simple invalidate the cache, drop any subscription 1012: # an let the next fetch start the ball rolling again... however that may 1013: # actually be more difficult than it looks given the complex web of 1014: # proxy servers. 1015: # Parameters: 1016: # $cmd - The command that got us here. 1017: # $tail - Tail of the command (remaining parameters). 1018: # $client - File descriptor connected to client. 1019: # Returns 1020: # 0 - Requested to exit, caller should shut down. 1021: # 1 - Continue processing. 1022: # Implicit inputs: 1023: # The authentication systems describe above have their own forms of implicit 1024: # input into the authentication process that are described above. 1025: # 1026: sub UpdateResourceHandler { 1027: my $cmd = shift; 1028: my $tail = shift; 1029: my $client = shift; 1030: 1031: my $userinput = "$cmd:$tail"; 1032: 1033: my $fname= $tail; # This allows interactive testing 1034: 1035: 1036: my $ownership=ishome($fname); 1037: if ($ownership eq 'not_owner') { 1038: if (-e $fname) { 1039: my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size, 1040: $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname); 1041: my $now=time; 1042: my $since=$now-$atime; 1043: if ($since>$perlvar{'lonExpire'}) { 1044: my $reply=&reply("unsub:$fname","$clientname"); 1045: unlink("$fname"); 1046: } else { 1047: my $transname="$fname.in.transfer"; 1048: my $remoteurl=&reply("sub:$fname","$clientname"); 1049: my $response; 1050: alarm(120); 1051: { 1052: my $ua=new LWP::UserAgent; 1053: my $request=new HTTP::Request('GET',"$remoteurl"); 1054: $response=$ua->request($request,$transname); 1055: } 1056: alarm(0); 1057: if ($response->is_error()) { 1058: unlink($transname); 1059: my $message=$response->status_line; 1060: &logthis("LWP GET: $message for $fname ($remoteurl)"); 1061: } else { 1062: if ($remoteurl!~/\.meta$/) { 1063: alarm(120); 1064: { 1065: my $ua=new LWP::UserAgent; 1066: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta'); 1067: my $mresponse=$ua->request($mrequest,$fname.'.meta'); 1068: if ($mresponse->is_error()) { 1069: unlink($fname.'.meta'); 1070: } 1071: } 1072: alarm(0); 1073: } 1074: rename($transname,$fname); 1075: } 1076: } 1077: Reply( $client, "ok\n", $userinput); 1078: } else { 1079: Failure($client, "not_found\n", $userinput); 1080: } 1081: } else { 1082: Failure($client, "rejected\n", $userinput); 1083: } 1084: return 1; 1085: } 1086: RegisterHandler("update", \&UpdateResourceHandler, 0 ,1, 0); 1087: 1088: # 1089: # Fetch a user file from a remote server: 1090: # Parameters: 1091: # $cmd - The command that got us here. 1092: # $tail - Tail of the command (remaining parameters). 1093: # $client - File descriptor connected to client. 1094: # Returns 1095: # 0 - Requested to exit, caller should shut down. 1096: # 1 - Continue processing. 1097: # 1098: sub FetchUserFileHandler { 1099: my $cmd = shift; 1100: my $tail = shift; 1101: my $client = shift; 1102: 1103: my $userinput = "$cmd:$tail"; 1104: my $fname = $tail; 1105: my ($udom,$uname,$ufile)=split(/\//,$fname); 1106: my $udir=propath($udom,$uname).'/userfiles'; 1107: unless (-e $udir) { 1108: mkdir($udir,0770); 1109: } 1110: if (-e $udir) { 1111: $ufile=~s/^[\.\~]+//; 1112: $ufile=~s/\///g; 1113: my $destname=$udir.'/'.$ufile; 1114: my $transname=$udir.'/'.$ufile.'.in.transit'; 1115: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname; 1116: my $response; 1117: alarm(120); 1118: { 1119: my $ua=new LWP::UserAgent; 1120: my $request=new HTTP::Request('GET',"$remoteurl"); 1121: $response=$ua->request($request,$transname); 1122: } 1123: alarm(0); 1124: if ($response->is_error()) { 1125: unlink($transname); 1126: my $message=$response->status_line; 1127: &logthis("LWP GET: $message for $fname ($remoteurl)"); 1128: Failure($client, "failed\n", $userinput); 1129: } else { 1130: if (!rename($transname,$destname)) { 1131: &logthis("Unable to move $transname to $destname"); 1132: unlink($transname); 1133: Failure($client, "failed\n", $userinput); 1134: } else { 1135: Reply($client, "ok\n", $userinput); 1136: } 1137: } 1138: } else { 1139: Failure($client, "not_home\n", $userinput); 1140: } 1141: return 1; 1142: } 1143: RegisterHandler("fetchuserfile", \&FetchUserFileHandler, 0, 1, 0); 1144: # 1145: # Authenticate access to a user file. 1146: # 1147: # Parameters: 1148: # $cmd - The command that got us here. 1149: # $tail - Tail of the command (remaining parameters). 1150: # $client - File descriptor connected to client. 1151: # Returns 1152: # 0 - Requested to exit, caller should shut down. 1153: # 1 - Continue processing. 1154: sub AuthenticateUserFileAccess { 1155: my $cmd = shift; 1156: my $tail = shift; 1157: my $client = shift; 1158: my $userinput = "$cmd:$tail"; 1159: 1160: my ($fname,$session)=split(/:/,$tail); 1161: chomp($session); 1162: my $reply='non_auth'; 1163: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.$session.'.id')) { 1164: while (my $line=<ENVIN>) { 1165: if ($line=~/userfile\.$fname\=/) { 1166: $reply='ok'; 1167: } 1168: } 1169: close(ENVIN); 1170: Reply($client, $reply."\n", $userinput); 1171: } else { 1172: Failure($client, "invalid_token\n", $userinput); 1173: } 1174: return 1; 1175: 1176: } 1177: RegisterHandler("tokenauthuserfile", \&AuthenticateUserFileAccess, 0, 1, 0); 1178: # 1179: # Unsubscribe from a resource. 1180: # 1181: # Parameters: 1182: # $cmd - The command that got us here. 1183: # $tail - Tail of the command (remaining parameters). 1184: # $client - File descriptor connected to client. 1185: # Returns 1186: # 0 - Requested to exit, caller should shut down. 1187: # 1 - Continue processing. 1188: # 1189: sub UnsubscribeHandler { 1190: my $cmd = shift; 1191: my $tail = shift; 1192: my $client = shift; 1193: my $userinput= "$cmd:$tail"; 1194: 1195: my ($fname) = $tail; 1196: 1197: Debug("Unsubscribing $fname"); 1198: if (-e $fname) { 1199: Debug("Exists"); 1200: Reply($client, &unsub($fname,$clientip), $userinput); 1201: } else { 1202: Failure($client, "not_found\n", $userinput); 1203: } 1204: return 1; 1205: } 1206: RegisterHandler("unsub", \&UnsubscribeHandler, 0, 1, 0); 1207: 1208: # Subscribe to a resource 1209: # 1210: # Parameters: 1211: # $cmd - The command that got us here. 1212: # $tail - Tail of the command (remaining parameters). 1213: # $client - File descriptor connected to client. 1214: # Returns 1215: # 0 - Requested to exit, caller should shut down. 1216: # 1 - Continue processing. 1217: # 1218: sub SubscribeHandler { 1219: my $cmd = shift; 1220: my $tail = shift; 1221: my $client = shift; 1222: my $userinput = "$cmd:$tail"; 1223: 1224: Reply( $client, &subscribe($userinput,$clientip), $userinput); 1225: 1226: return 1; 1227: } 1228: RegisterHandler("sub", \&SubscribeHandler, 0, 1, 0); 1229: 1230: # 1231: # Determine the version of a resource (?) Or is it return 1232: # the top version of the resource? Not yet clear from the 1233: # code in currentversion. 1234: # 1235: # Parameters: 1236: # $cmd - The command that got us here. 1237: # $tail - Tail of the command (remaining parameters). 1238: # $client - File descriptor connected to client. 1239: # Returns 1240: # 0 - Requested to exit, caller should shut down. 1241: # 1 - Continue processing. 1242: # 1243: sub CurrentVersionHandler { 1244: my $cmd = shift; 1245: my $tail = shift; 1246: my $client = shift; 1247: my $userinput= "$cmd:$tail"; 1248: 1249: my $fname = $tail; 1250: Reply( $client, &currentversion($fname)."\n", $userinput); 1251: return 1; 1252: 1253: } 1254: RegisterHandler("currentversion", \&CurrentVersionHandler, 0, 1, 0); 1255: 1256: 1257: # Make an entry in a user's activity log. 1258: # 1259: # Parameters: 1260: # $cmd - The command that got us here. 1261: # $tail - Tail of the command (remaining parameters). 1262: # $client - File descriptor connected to client. 1263: # Returns 1264: # 0 - Requested to exit, caller should shut down. 1265: # 1 - Continue processing. 1266: # 1267: sub ActivityLogEntryHandler { 1268: my $cmd = shift; 1269: my $tail = shift; 1270: my $client = shift; 1271: my $userinput= "$cmd:$tail"; 1272: 1273: my ($udom,$uname,$what)=split(/:/,$tail); 1274: chomp($what); 1275: my $proname=propath($udom,$uname); 1276: my $now=time; 1277: my $hfh; 1278: if ($hfh=IO::File->new(">>$proname/activity.log")) { 1279: print $hfh "$now:$clientname:$what\n"; 1280: Reply( $client, "ok\n", $userinput); 1281: } else { 1282: Failure($client, "error: ".($!+0)." IO::File->new Failed " 1283: ."while attempting log\n", 1284: $userinput); 1285: } 1286: 1287: return 1; 1288: } 1289: RegisterHandler("log", \&ActivityLogEntryHandler, 0, 1, 0); 1290: # 1291: # Put a namespace entry in a user profile hash. 1292: # My druthers would be for this to be an encrypted interaction too. 1293: # anything that might be an inadvertent covert channel about either 1294: # user authentication or user personal information.... 1295: # 1296: # Parameters: 1297: # $cmd - The command that got us here. 1298: # $tail - Tail of the command (remaining parameters). 1299: # $client - File descriptor connected to client. 1300: # Returns 1301: # 0 - Requested to exit, caller should shut down. 1302: # 1 - Continue processing. 1303: # 1304: sub PutUserProfileEntry { 1305: my $cmd = shift; 1306: my $tail = shift; 1307: my $client = shift; 1308: my $userinput = "$cmd:$tail"; 1309: 1310: my ($udom,$uname,$namespace,$what) =split(/:/,$tail); 1311: if ($namespace ne 'roles') { 1312: chomp($what); 1313: my $hashref = TieUserHash($udom, $uname, $namespace, 1314: &GDBM_WRCREAT(),"P",$what); 1315: if($hashref) { 1316: my @pairs=split(/\&/,$what); 1317: foreach my $pair (@pairs) { 1318: my ($key,$value)=split(/=/,$pair); 1319: $hashref->{$key}=$value; 1320: } 1321: if (untie(%$hashref)) { 1322: Reply( $client, "ok\n", $userinput); 1323: } else { 1324: Failure($client, "error: ".($!+0)." untie(GDBM) failed ". 1325: "while attempting put\n", 1326: $userinput); 1327: } 1328: } else { 1329: Failure( $client, "error: ".($!)." tie(GDBM) Failed ". 1330: "while attempting put\n", $userinput); 1331: } 1332: } else { 1333: Failure( $client, "refused\n", $userinput); 1334: } 1335: 1336: return 1; 1337: } 1338: RegisterHandler("put", \&PutUserProfileEntry, 0, 1, 0); 1339: 1340: # 1341: # Increment a profile entry in the user history file. 1342: # The history contains keyword value pairs. In this case, 1343: # The value itself is a pair of numbers. The first, the current value 1344: # the second an increment that this function applies to the current 1345: # value. 1346: # 1347: # Parameters: 1348: # $cmd - The command that got us here. 1349: # $tail - Tail of the command (remaining parameters). 1350: # $client - File descriptor connected to client. 1351: # Returns 1352: # 0 - Requested to exit, caller should shut down. 1353: # 1 - Continue processing. 1354: # 1355: sub IncrementUserValueHandler { 1356: my $cmd = shift; 1357: my $tail = shift; 1358: my $client = shift; 1359: my $userinput = "$cmd:$tail"; 1360: 1361: my ($udom,$uname,$namespace,$what) =split(/:/,$tail); 1362: if ($namespace ne 'roles') { 1363: chomp($what); 1364: my $hashref = TieUserHash($udom, $uname, 1365: $namespace, &GDBM_WRCREAT(), 1366: "P",$what); 1367: if ($hashref) { 1368: my @pairs=split(/\&/,$what); 1369: foreach my $pair (@pairs) { 1370: my ($key,$value)=split(/=/,$pair); 1371: # We could check that we have a number... 1372: if (! defined($value) || $value eq '') { 1373: $value = 1; 1374: } 1375: $hashref->{$key}+=$value; 1376: } 1377: if (untie(%$hashref)) { 1378: Reply( $client, "ok\n", $userinput); 1379: } else { 1380: Failure($client, "error: ".($!+0)." untie(GDBM) failed ". 1381: "while attempting inc\n", $userinput); 1382: } 1383: } else { 1384: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1385: "while attempting inc\n", $userinput); 1386: } 1387: } else { 1388: Failure($client, "refused\n", $userinput); 1389: } 1390: 1391: return 1; 1392: } 1393: RegisterHandler("inc", \&IncrementUserValueHandler, 0, 1, 0); 1394: # 1395: # Put a new role for a user. Roles are LonCAPA's packaging of permissions. 1396: # Each 'role' a user has implies a set of permissions. Adding a new role 1397: # for a person grants the permissions packaged with that role 1398: # to that user when the role is selected. 1399: # 1400: # Parameters: 1401: # $cmd - The command string (rolesput). 1402: # $tail - The remainder of the request line. For rolesput this 1403: # consists of a colon separated list that contains: 1404: # The domain and user that is granting the role (logged). 1405: # The domain and user that is getting the role. 1406: # The roles being granted as a set of & separated pairs. 1407: # each pair a key value pair. 1408: # $client - File descriptor connected to the client. 1409: # Returns: 1410: # 0 - If the daemon should exit 1411: # 1 - To continue processing. 1412: # 1413: # 1414: sub RolesPutHandler { 1415: my $cmd = shift; 1416: my $tail = shift; 1417: my $client = shift; 1418: my $userinput = "$cmd:$tail"; 1419: 1420: my ( $exedom, $exeuser, $udom, $uname, $what) = split(/:/,$tail); 1421: 1422: 1423: my $namespace='roles'; 1424: chomp($what); 1425: my $hashref = TieUserHash($udom, $uname, $namespace, 1426: &GDBM_WRCREAT(), "P", 1427: "$exedom:$exeuser:$what"); 1428: # 1429: # Log the attempt to set a role. The {}'s here ensure that the file 1430: # handle is open for the minimal amount of time. Since the flush 1431: # is done on close this improves the chances the log will be an un- 1432: # corrupted ordered thing. 1433: if ($hashref) { 1434: my @pairs=split(/\&/,$what); 1435: foreach my $pair (@pairs) { 1436: my ($key,$value)=split(/=/,$pair); 1437: &ManagePermissions($key, $udom, $uname, 1438: &GetAuthType( $udom, $uname)); 1439: $hashref->{$key}=$value; 1440: } 1441: if (untie($hashref)) { 1442: Reply($client, "ok\n", $userinput); 1443: } else { 1444: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 1445: "while attempting rolesput\n", $userinput); 1446: } 1447: } else { 1448: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1449: "while attempting rolesput\n", $userinput); 1450: } 1451: return 1; 1452: } 1453: RegisterHandler("rolesput", \&RolesPutHandler, 1,1,0); # Encoded client only. 1454: # 1455: # Deletes (removes) a role for a user. This is equivalent to removing 1456: # a permissions package associated with the role from the user's profile. 1457: # 1458: # Parameters: 1459: # $cmd - The command (rolesdel) 1460: # $tail - The remainder of the request line. This consists 1461: # of: 1462: # The domain and user requesting the change (logged) 1463: # The domain and user being changed. 1464: # The roles being revoked. These are shipped to us 1465: # as a bunch of & separated role name keywords. 1466: # $client - The file handle open on the client. 1467: # Returns: 1468: # 1 - Continue processing 1469: # 0 - Exit. 1470: # 1471: sub RolesDeleteHandler { 1472: my $cmd = shift; 1473: my $tail = shift; 1474: my $client = shift; 1475: my $userinput = "$cmd:$tail"; 1476: 1477: my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail); 1478: &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom. 1479: "what = ".$what); 1480: my $namespace='roles'; 1481: chomp($what); 1482: my $hashref = TieUserHash($udom, $uname, $namespace, 1483: &GDBM_WRCREAT(), "D", 1484: "$exedom:$exeuser:$what"); 1485: 1486: if ($hashref) { 1487: my @rolekeys=split(/\&/,$what); 1488: 1489: foreach my $key (@rolekeys) { 1490: delete $hashref->{$key}; 1491: } 1492: if (untie(%$hashref)) { 1493: Reply($client, "ok\n", $userinput); 1494: } else { 1495: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 1496: "while attempting rolesdel\n", $userinput); 1497: } 1498: } else { 1499: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1500: "while attempting rolesdel\n", $userinput); 1501: } 1502: 1503: return 1; 1504: } 1505: RegisterHandler("rolesdel", \&RolesDeleteHandler, 1,1, 0); # Encoded client only 1506: 1507: # Unencrypted get from a user's profile database. See 1508: # GetProfileEntryEncrypted for a version that does end-to-end encryption. 1509: # This function retrieves a keyed item from a specific named database in the 1510: # user's directory. 1511: # 1512: # Parameters: 1513: # $cmd - Command request keyword (get). 1514: # $tail - Tail of the command. This is a colon separated list 1515: # consisting of the domain and username that uniquely 1516: # identifies the profile, 1517: # The 'namespace' which selects the gdbm file to 1518: # do the lookup in, 1519: # & separated list of keys to lookup. Note that 1520: # the values are returned as an & separated list too. 1521: # $client - File descriptor open on the client. 1522: # Returns: 1523: # 1 - Continue processing. 1524: # 0 - Exit. 1525: # 1526: sub GetProfileEntry { 1527: my $cmd = shift; 1528: my $tail = shift; 1529: my $client = shift; 1530: my $userinput= "$cmd:$tail"; 1531: 1532: my ($udom,$uname,$namespace,$what) = split(/:/,$tail); 1533: chomp($what); 1534: my $hashref = TieUserHash($udom, $uname, $namespace, 1535: &GDBM_READER()); 1536: if ($hashref) { 1537: my @queries=split(/\&/,$what); 1538: my $qresult=''; 1539: 1540: for (my $i=0;$i<=$#queries;$i++) { 1541: $qresult.="$hashref->{$queries[$i]}&"; # Presumably failure gives empty string. 1542: } 1543: $qresult=~s/\&$//; # Remove trailing & from last lookup. 1544: if (untie(%$hashref)) { 1545: Reply($client, "$qresult\n", $userinput); 1546: } else { 1547: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1548: "while attempting get\n", $userinput); 1549: } 1550: } else { 1551: if ($!+0 == 2) { # +0 coerces errno -> number 2 is ENOENT 1552: Failure($client, "error:No such file or ". 1553: "GDBM reported bad block error\n", $userinput); 1554: } else { # Some other undifferentiated err. 1555: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1556: "while attempting get\n", $userinput); 1557: } 1558: } 1559: return 1; 1560: } 1561: RegisterHandler("get", \&GetProfileEntry, 0,1,0); 1562: # 1563: # Process the encrypted get request. Note that the request is sent 1564: # in clear, but the reply is encrypted. This is a small covert channel: 1565: # information about the sensitive keys is given to the snooper. Just not 1566: # information about the values of the sensitive key. Hmm if I wanted to 1567: # know these I'd snoop for the egets. Get the profile item names from them 1568: # and then issue a get for them since there's no enforcement of the 1569: # requirement of an encrypted get for particular profile items. If I 1570: # were re-doing this, I'd force the request to be encrypted as well as the 1571: # reply. I'd also just enforce encrypted transactions for all gets since 1572: # that would prevent any covert channel snooping. 1573: # 1574: # Parameters: 1575: # $cmd - Command keyword of request (eget). 1576: # $tail - Tail of the command. See GetProfileEntry # for more information about this. 1577: # $client - File open on the client. 1578: # Returns: 1579: # 1 - Continue processing 1580: # 0 - server should exit. 1581: sub GetProfileEntryEncrypted { 1582: my $cmd = shift; 1583: my $tail = shift; 1584: my $client = shift; 1585: my $userinput = "$cmd:$tail"; 1586: 1587: my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput); 1588: chomp($what); 1589: my $hashref = TieUserHash($udom, $uname, $namespace, 1590: &GDBM_READER()); 1591: if ($hashref) { 1592: my @queries=split(/\&/,$what); 1593: my $qresult=''; 1594: for (my $i=0;$i<=$#queries;$i++) { 1595: $qresult.="$hashref->{$queries[$i]}&"; 1596: } 1597: if (untie(%$hashref)) { 1598: $qresult=~s/\&$//; 1599: if ($cipher) { 1600: my $cmdlength=length($qresult); 1601: $qresult.=" "; 1602: my $encqresult=''; 1603: for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) { 1604: $encqresult.= unpack("H16", 1605: $cipher->encrypt(substr($qresult, 1606: $encidx, 1607: 8))); 1608: } 1609: Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput); 1610: } else { 1611: Failure( $client, "error:no_key\n", $userinput); 1612: } 1613: } else { 1614: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1615: "while attempting eget\n", $userinput); 1616: } 1617: } else { 1618: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1619: "while attempting eget\n", $userinput); 1620: } 1621: 1622: return 1; 1623: } 1624: RegisterHandler("eget", \&GetProfileEntryEncrypted, 0, 1, 0); 1625: 1626: # 1627: # Deletes a key in a user profile database. 1628: # 1629: # Parameters: 1630: # $cmd - Command keyword (del). 1631: # $tail - Command tail. IN this case a colon 1632: # separated list containing: 1633: # The domain and user that identifies uniquely 1634: # the identity of the user. 1635: # The profile namespace (name of the profile 1636: # database file). 1637: # & separated list of keywords to delete. 1638: # $client - File open on client socket. 1639: # Returns: 1640: # 1 - Continue processing 1641: # 0 - Exit server. 1642: # 1643: # 1644: 1645: sub DeleteProfileEntry { 1646: my $cmd = shift; 1647: my $tail = shift; 1648: my $client = shift; 1649: my $userinput = "cmd:$tail"; 1650: 1651: my ($udom,$uname,$namespace,$what) = split(/:/,$tail); 1652: chomp($what); 1653: my $hashref = TieUserHash($udom, $uname, $namespace, 1654: &GDBM_WRCREAT(), 1655: "D",$what); 1656: if ($hashref) { 1657: my @keys=split(/\&/,$what); 1658: foreach my $key (@keys) { 1659: delete($hashref->{$key}); 1660: } 1661: if (untie(%$hashref)) { 1662: Reply($client, "ok\n", $userinput); 1663: } else { 1664: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1665: "while attempting del\n", $userinput); 1666: } 1667: } else { 1668: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1669: "while attempting del\n", $userinput); 1670: } 1671: return 1; 1672: } 1673: RegisterHandler("del", \&DeleteProfileEntry, 0, 1, 0); 1674: # 1675: # List the set of keys that are defined in a profile database file. 1676: # A successful reply from this will contain an & separated list of 1677: # the keys. 1678: # Parameters: 1679: # $cmd - Command request (keys). 1680: # $tail - Remainder of the request, a colon separated 1681: # list containing domain/user that identifies the 1682: # user being queried, and the database namespace 1683: # (database filename essentially). 1684: # $client - File open on the client. 1685: # Returns: 1686: # 1 - Continue processing. 1687: # 0 - Exit the server. 1688: # 1689: sub GetProfileKeys { 1690: my $cmd = shift; 1691: my $tail = shift; 1692: my $client = shift; 1693: my $userinput = "$cmd:$tail"; 1694: 1695: my ($udom,$uname,$namespace)=split(/:/,$tail); 1696: my $qresult=''; 1697: my $hashref = TieUserHash($udom, $uname, $namespace, 1698: &GDBM_READER()); 1699: if ($hashref) { 1700: foreach my $key (keys %$hashref) { 1701: $qresult.="$key&"; 1702: } 1703: if (untie(%$hashref)) { 1704: $qresult=~s/\&$//; 1705: Reply($client, "$qresult\n", $userinput); 1706: } else { 1707: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1708: "while attempting keys\n", $userinput); 1709: } 1710: } else { 1711: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1712: "while attempting keys\n", $userinput); 1713: } 1714: 1715: return 1; 1716: } 1717: RegisterHandler("keys", \&GetProfileKeys, 0, 1, 0); 1718: # 1719: # Dump the contents of a user profile database. 1720: # Note that this constitutes a very large covert channel too since 1721: # the dump will return sensitive information that is not encrypted. 1722: # The naive security assumption is that the session negotiation ensures 1723: # our client is trusted and I don't believe that's assured at present. 1724: # Sure want badly to go to ssl or tls. Of course if my peer isn't really 1725: # a LonCAPA node they could have negotiated an encryption key too so >sigh<. 1726: # 1727: # Parameters: 1728: # $cmd - The command request keyword (currentdump). 1729: # $tail - Remainder of the request, consisting of a colon 1730: # separated list that has the domain/username and 1731: # the namespace to dump (database file). 1732: # $client - file open on the remote client. 1733: # Returns: 1734: # 1 - Continue processing. 1735: # 0 - Exit the server. 1736: # 1737: sub DumpProfileDatabase { 1738: my $cmd = shift; 1739: my $tail = shift; 1740: my $client = shift; 1741: my $userinput = "$cmd:$tail"; 1742: 1743: my ($udom,$uname,$namespace) = split(/:/,$tail); 1744: my $hashref = TieUserHash($udom, $uname, $namespace, 1745: &GDBM_READER()); 1746: if ($hashref) { 1747: # Structure of %data: 1748: # $data{$symb}->{$parameter}=$value; 1749: # $data{$symb}->{'v.'.$parameter}=$version; 1750: # since $parameter will be unescaped, we do not 1751: # have to worry about silly parameter names... 1752: 1753: my $qresult=''; 1754: my %data = (); # A hash of anonymous hashes.. 1755: while (my ($key,$value) = each(%$hashref)) { 1756: my ($v,$symb,$param) = split(/:/,$key); 1757: next if ($v eq 'version' || $symb eq 'keys'); 1758: next if (exists($data{$symb}) && 1759: exists($data{$symb}->{$param}) && 1760: $data{$symb}->{'v.'.$param} > $v); 1761: $data{$symb}->{$param}=$value; 1762: $data{$symb}->{'v.'.$param}=$v; 1763: } 1764: if (untie(%$hashref)) { 1765: while (my ($symb,$param_hash) = each(%data)) { 1766: while(my ($param,$value) = each (%$param_hash)){ 1767: next if ($param =~ /^v\./); # Ignore versions... 1768: # 1769: # Just dump the symb=value pairs separated by & 1770: # 1771: $qresult.=$symb.':'.$param.'='.$value.'&'; 1772: } 1773: } 1774: chop($qresult); 1775: Reply($client , "$qresult\n", $userinput); 1776: } else { 1777: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 1778: "while attempting currentdump\n", $userinput); 1779: } 1780: } else { 1781: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1782: "while attempting currentdump\n", $userinput); 1783: } 1784: 1785: return 1; 1786: } 1787: RegisterHandler("currentdump", \&DumpProfileDatabase, 0, 1, 0); 1788: # 1789: # Dump a profile database with an optional regular expression 1790: # to match against the keys. In this dump, no effort is made 1791: # to separate symb from version information. Presumably the 1792: # databases that are dumped by this command are of a different 1793: # structure. Need to look at this and improve the documentation of 1794: # both this and the currentdump handler. 1795: # Parameters: 1796: # $cmd - The command keyword. 1797: # $tail - All of the characters after the $cmd: 1798: # These are expected to be a colon 1799: # separated list containing: 1800: # domain/user - identifying the user. 1801: # namespace - identifying the database. 1802: # regexp - optional regular expression 1803: # that is matched against 1804: # database keywords to do 1805: # selective dumps. 1806: # $client - Channel open on the client. 1807: # Returns: 1808: # 1 - Continue processing. 1809: # Side effects: 1810: # response is written to $client. 1811: # 1812: sub DumpWithRegexp { 1813: my $cmd = shift; 1814: my $tail = shift; 1815: my $client = shift; 1816: 1817: my $userinput = "$cmd:$tail"; 1818: 1819: my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail); 1820: if (defined($regexp)) { 1821: $regexp=&unescape($regexp); 1822: } else { 1823: $regexp='.'; 1824: } 1825: my $hashref =TieUserHash($udom, $uname, $namespace, 1826: &GDBM_READER()); 1827: if ($hashref) { 1828: my $qresult=''; 1829: while (my ($key,$value) = each(%$hashref)) { 1830: if ($regexp eq '.') { 1831: $qresult.=$key.'='.$value.'&'; 1832: } else { 1833: my $unescapeKey = &unescape($key); 1834: if (eval('$unescapeKey=~/$regexp/')) { 1835: $qresult.="$key=$value&"; 1836: } 1837: } 1838: } 1839: if (untie(%$hashref)) { 1840: chop($qresult); 1841: Reply($client, "$qresult\n", $userinput); 1842: } else { 1843: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 1844: "while attempting dump\n", $userinput); 1845: } 1846: } else { 1847: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1848: "while attempting dump\n", $userinput); 1849: } 1850: 1851: return 1; 1852: } 1853: RegisterHandler("dump", \&DumpWithRegexp, 0, 1, 0); 1854: 1855: # Store a set of key=value pairs associated with a versioned name. 1856: # 1857: # Parameters: 1858: # $cmd - Request command keyword. 1859: # $tail - Tail of the request. This is a colon 1860: # separated list containing: 1861: # domain/user - User and authentication domain. 1862: # namespace - Name of the database being modified 1863: # rid - Resource keyword to modify. 1864: # what - new value associated with rid. 1865: # 1866: # $client - Socket open on the client. 1867: # 1868: # 1869: # Returns: 1870: # 1 (keep on processing). 1871: # Side-Effects: 1872: # Writes to the client 1873: sub StoreHandler { 1874: my $cmd = shift; 1875: my $tail = shift; 1876: my $client = shift; 1877: 1878: my $userinput = "$cmd:$tail"; 1879: 1880: my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail); 1881: if ($namespace ne 'roles') { 1882: 1883: chomp($what); 1884: my @pairs=split(/\&/,$what); 1885: my $hashref = TieUserHash($udom, $uname, $namespace, 1886: &GDBM_WRCREAT(), "P", 1887: "$rid:$what"); 1888: if ($hashref) { 1889: my $now = time; 1890: my @previouskeys=split(/&/,$hashref->{"keys:$rid"}); 1891: my $key; 1892: $hashref->{"version:$rid"}++; 1893: my $version=$hashref->{"version:$rid"}; 1894: my $allkeys=''; 1895: foreach my $pair (@pairs) { 1896: my ($key,$value)=split(/=/,$pair); 1897: $allkeys.=$key.':'; 1898: $hashref->{"$version:$rid:$key"}=$value; 1899: } 1900: $hashref->{"$version:$rid:timestamp"}=$now; 1901: $allkeys.='timestamp'; 1902: $hashref->{"$version:keys:$rid"}=$allkeys; 1903: if (untie($hashref)) { 1904: Reply($client, "ok\n", $userinput); 1905: } else { 1906: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1907: "while attempting store\n", $userinput); 1908: } 1909: } else { 1910: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 1911: "while attempting store\n", $userinput); 1912: } 1913: } else { 1914: Failure($client, "refused\n", $userinput); 1915: } 1916: 1917: return 1; 1918: } 1919: RegisterHandler("store", \&StoreHandler, 0, 1, 0); 1920: # 1921: # Dump out all versions of a resource that has key=value pairs associated 1922: # with it for each version. These resources are built up via the store 1923: # command. 1924: # 1925: # Parameters: 1926: # $cmd - Command keyword. 1927: # $tail - Remainder of the request which consists of: 1928: # domain/user - User and auth. domain. 1929: # namespace - name of resource database. 1930: # rid - Resource id. 1931: # $client - socket open on the client. 1932: # 1933: # Returns: 1934: # 1 indicating the caller should not yet exit. 1935: # Side-effects: 1936: # Writes a reply to the client. 1937: # The reply is a string of the following shape: 1938: # version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2... 1939: # Where the 1 above represents version 1. 1940: # this continues for all pairs of keys in all versions. 1941: # 1942: # 1943: # 1944: # 1945: sub RestoreHandler { 1946: my $cmd = shift; 1947: my $tail = shift; 1948: my $client = shift; 1949: 1950: my $userinput = "$cmd:$tail"; # Only used for logging purposes. 1951: 1952: my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput); 1953: $namespace=~s/\//\_/g; 1954: $namespace=~s/\W//g; 1955: chomp($rid); 1956: my $proname=propath($udom,$uname); 1957: my $qresult=''; 1958: my %hash; 1959: if (tie(%hash,'GDBM_File',"$proname/$namespace.db", 1960: &GDBM_READER(),0640)) { 1961: my $version=$hash{"version:$rid"}; 1962: $qresult.="version=$version&"; 1963: my $scope; 1964: for ($scope=1;$scope<=$version;$scope++) { 1965: my $vkeys=$hash{"$scope:keys:$rid"}; 1966: my @keys=split(/:/,$vkeys); 1967: my $key; 1968: $qresult.="$scope:keys=$vkeys&"; 1969: foreach $key (@keys) { 1970: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&"; 1971: } 1972: } 1973: if (untie(%hash)) { 1974: $qresult=~s/\&$//; 1975: Reply( $client, "$qresult\n", $userinput); 1976: } else { 1977: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 1978: "while attempting restore\n", $userinput); 1979: } 1980: } else { 1981: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 1982: "while attempting restore\n", $userinput); 1983: } 1984: 1985: return 1; 1986: 1987: 1988: } 1989: RegisterHandler("restore", \&RestoreHandler, 0,1,0); 1990: 1991: # 1992: # Add a chat message to to a discussion board. 1993: # 1994: # Parameters: 1995: # $cmd - Request keyword. 1996: # $tail - Tail of the command. A colon separated list 1997: # containing: 1998: # cdom - Domain on which the chat board lives 1999: # cnum - Identifier of the discussion group. 2000: # post - Body of the posting. 2001: # $client - Socket open on the client. 2002: # Returns: 2003: # 1 - Indicating caller should keep on processing. 2004: # 2005: # Side-effects: 2006: # writes a reply to the client. 2007: # 2008: # 2009: sub SendChatHandler { 2010: my $cmd = shift; 2011: my $tail = shift; 2012: my $client = shift; 2013: 2014: my $userinput = "$cmd:$tail"; 2015: 2016: my ($cdom,$cnum,$newpost)=split(/\:/,$tail); 2017: &chatadd($cdom,$cnum,$newpost); 2018: Reply($client, "ok\n", $userinput); 2019: 2020: return 1; 2021: } 2022: RegisterHandler("chatsend", \&SendChatHandler, 0, 1, 0); 2023: # 2024: # Retrieve the set of chat messagss from a discussion board. 2025: # 2026: # Parameters: 2027: # $cmd - Command keyword that initiated the request. 2028: # $tail - Remainder of the request after the command 2029: # keyword. In this case a colon separated list of 2030: # chat domain - Which discussion board. 2031: # chat id - Discussion thread(?) 2032: # domain/user - Authentication domain and username 2033: # of the requesting person. 2034: # $client - Socket open on the client program. 2035: # Returns: 2036: # 1 - continue processing 2037: # Side effects: 2038: # Response is written to the client. 2039: # 2040: sub RetrieveChatHandler { 2041: my $cmd = shift; 2042: my $tail = shift; 2043: my $client = shift; 2044: 2045: my $userinput = "$cmd:$tail"; 2046: 2047: my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail); 2048: my $reply=''; 2049: foreach (&getchat($cdom,$cnum,$udom,$uname)) { 2050: $reply.=&escape($_).':'; 2051: } 2052: $reply=~s/\:$//; 2053: Reply($client, $reply."\n", $userinput); 2054: 2055: 2056: return 1; 2057: } 2058: RegisterHandler("chatretr", \&RetrieveChatHandler, 0, 1, 0); 2059: # 2060: # Initiate a query of an sql database. SQL query repsonses get put in 2061: # a file for later retrieval. This prevents sql query results from 2062: # bottlenecking the system. Note that with loncnew, perhaps this is 2063: # less of an issue since multiple outstanding requests can be concurrently 2064: # serviced. 2065: # 2066: # Parameters: 2067: # $cmd - COmmand keyword that initiated the request. 2068: # $tail - Remainder of the command after the keyword. 2069: # For this function, this consists of a query and 2070: # 3 arguments that are self-documentingly labelled 2071: # in the original arg1, arg2, arg3. 2072: # $client - Socket open on the client. 2073: # Return: 2074: # 1 - Indicating processing should continue. 2075: # Side-effects: 2076: # a reply is written to $client. 2077: # 2078: sub SendQueryHandler { 2079: my $cmd = shift; 2080: my $tail = shift; 2081: my $client = shift; 2082: 2083: my $userinput = "$cmd:$tail"; 2084: 2085: my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail); 2086: $query=~s/\n*$//g; 2087: Reply($client, "". sqlreply("$clientname\&$query". 2088: "\&$arg1"."\&$arg2"."\&$arg3")."\n", 2089: $userinput); 2090: 2091: return 1; 2092: } 2093: RegisterHandler("querysend", \&SendQueryHandler, 0, 1, 0); 2094: 2095: # 2096: # Add a reply to an sql query. SQL queries are done asyncrhonously. 2097: # The query is submitted via a "querysend" transaction. 2098: # There it is passed on to the lonsql daemon, queued and issued to 2099: # mysql. 2100: # This transaction is invoked when the sql transaction is complete 2101: # it stores the query results in flie and indicates query completion. 2102: # presumably local software then fetches this response... I'm guessing 2103: # the sequence is: lonc does a querysend, we ask lonsql to do it. 2104: # lonsql on completion of the query interacts with the lond of our 2105: # client to do a query reply storing two files: 2106: # - id - The results of the query. 2107: # - id.end - Indicating the transaction completed. 2108: # NOTE: id is a unique id assigned to the query and querysend time. 2109: # Parameters: 2110: # $cmd - Command keyword that initiated this request. 2111: # $tail - Remainder of the tail. In this case that's a colon 2112: # separated list containing the query Id and the 2113: # results of the query. 2114: # $client - Socket open on the client. 2115: # Return: 2116: # 1 - Indicating that we should continue processing. 2117: # Side effects: 2118: # ok written to the client. 2119: # 2120: sub ReplyQueryHandler { 2121: my $cmd = shift; 2122: my $tail = shift; 2123: my $client = shift; 2124: 2125: my $userinput = "$cmd:$tail"; 2126: 2127: my ($cmd,$id,$reply)=split(/:/,$userinput); 2128: my $store; 2129: my $execdir=$perlvar{'lonDaemons'}; 2130: if ($store=IO::File->new(">$execdir/tmp/$id")) { 2131: $reply=~s/\&/\n/g; 2132: print $store $reply; 2133: close $store; 2134: my $store2=IO::File->new(">$execdir/tmp/$id.end"); 2135: print $store2 "done\n"; 2136: close $store2; 2137: Reply($client, "ok\n", $userinput); 2138: } else { 2139: Failure($client, "error: ".($!+0) 2140: ." IO::File->new Failed ". 2141: "while attempting queryreply\n", $userinput); 2142: } 2143: 2144: 2145: return 1; 2146: } 2147: RegisterHandler("queryreply", \&ReplyQueryHandler, 0, 1, 0); 2148: # 2149: # Process the courseidput query. Not quite sure what this means 2150: # at the system level sense. It appears a gdbm file in the 2151: # /home/httpd/lonUsers/$domain/nohist_courseids is tied and 2152: # a set of entries made in that database. 2153: # 2154: # Parameters: 2155: # $cmd - The command keyword that initiated this request. 2156: # $tail - Tail of the command. In this case consists of a colon 2157: # separated list contaning the domain to apply this to and 2158: # an ampersand separated list of keyword=value pairs. 2159: # $client - Socket open on the client. 2160: # Returns: 2161: # 1 - indicating that processing should continue 2162: # 2163: # Side effects: 2164: # reply is written to the client. 2165: # 2166: sub PutCourseIdHandler { 2167: my $cmd = shift; 2168: my $tail = shift; 2169: my $client = shift; 2170: 2171: my $userinput = "$cmd:$tail"; 2172: 2173: my ($udom, $what) = split(/:/, $tail); 2174: chomp($what); 2175: my $now=time; 2176: my @pairs=split(/\&/,$what); 2177: 2178: my $hashref = TieDomainHash($udom, "nohist_courseids", &GDBM_WRCREAT()); 2179: if ($hashref) { 2180: foreach my $pair (@pairs) { 2181: my ($key,$value)=split(/=/,$pair); 2182: $hashref->{$key}=$value.':'.$now; 2183: } 2184: if (untie(%$hashref)) { 2185: Reply($client, "ok\n", $userinput); 2186: } else { 2187: Failure( $client, "error: ".($!+0) 2188: ." untie(GDBM) Failed ". 2189: "while attempting courseidput\n", $userinput); 2190: } 2191: } else { 2192: Failure( $client, "error: ".($!+0) 2193: ." tie(GDBM) Failed ". 2194: "while attempting courseidput\n", $userinput); 2195: } 2196: 2197: return 1; 2198: } 2199: RegisterHandler("courseidput", \&PutCourseIdHandler, 0, 1, 0); 2200: 2201: # Retrieves the value of a course id resource keyword pattern 2202: # defined since a starting date. Both the starting date and the 2203: # keyword pattern are optional. If the starting date is not supplied it 2204: # is treated as the beginning of time. If the pattern is not found, 2205: # it is treatred as "." matching everything. 2206: # 2207: # Parameters: 2208: # $cmd - Command keyword that resulted in us being dispatched. 2209: # $tail - The remainder of the command that, in this case, consists 2210: # of a colon separated list of: 2211: # domain - The domain in which the course database is 2212: # defined. 2213: # since - Optional parameter describing the minimum 2214: # time of definition(?) of the resources that 2215: # will match the dump. 2216: # description - regular expression that is used to filter 2217: # the dump. Only keywords matching this regexp 2218: # will be used. 2219: # $client - The socket open on the client. 2220: # Returns: 2221: # 1 - Continue processing. 2222: # Side Effects: 2223: # a reply is written to $client. 2224: sub DumpCourseIdHandler { 2225: my $cmd = shift; 2226: my $tail = shift; 2227: my $client = shift; 2228: 2229: my $userinput = "$cmd:$tail"; 2230: 2231: my ($udom,$since,$description) =split(/:/,$tail); 2232: if (defined($description)) { 2233: $description=&unescape($description); 2234: } else { 2235: $description='.'; 2236: } 2237: unless (defined($since)) { $since=0; } 2238: my $qresult=''; 2239: logthis(" Looking for $description since $since"); 2240: my $hashref = TieDomainHash($udom, "nohist_courseids", &GDBM_WRCREAT()); 2241: if ($hashref) { 2242: while (my ($key,$value) = each(%$hashref)) { 2243: my ($descr,$lasttime)=split(/\:/,$value); 2244: logthis("Got: key = $key descr = $descr time: $lasttime"); 2245: if ($lasttime<$since) { 2246: logthis("Skipping .. too early"); 2247: next; 2248: } 2249: if ($description eq '.') { 2250: logthis("Adding wildcard match"); 2251: $qresult.=$key.'='.$descr.'&'; 2252: } else { 2253: my $unescapeVal = &unescape($descr); 2254: logthis("Matching with $unescapeVal"); 2255: if (eval('$unescapeVal=~/$description/i')) { 2256: logthis("Adding on match"); 2257: $qresult.="$key=$descr&"; 2258: } 2259: } 2260: } 2261: if (untie(%$hashref)) { 2262: chop($qresult); 2263: Reply($client, "$qresult\n", $userinput); 2264: } else { 2265: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2266: "while attempting courseiddump\n", $userinput); 2267: } 2268: } else { 2269: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2270: "while attempting courseiddump\n", $userinput); 2271: } 2272: 2273: 2274: return 1; 2275: } 2276: RegisterHandler("courseiddump", \&DumpCourseIdHandler, 0, 1, 0); 2277: # 2278: # Puts an id to a domains id database. 2279: # 2280: # Parameters: 2281: # $cmd - The command that triggered us. 2282: # $tail - Remainder of the request other than the command. This is a 2283: # colon separated list containing: 2284: # $domain - The domain for which we are writing the id. 2285: # $pairs - The id info to write... this is and & separated list 2286: # of keyword=value. 2287: # $client - Socket open on the client. 2288: # Returns: 2289: # 1 - Continue processing. 2290: # Side effects: 2291: # reply is written to $client. 2292: # 2293: sub PutIdHandler { 2294: my $cmd = shift; 2295: my $tail = shift; 2296: my $client = shift; 2297: 2298: my $userinput = "$cmd:$tail"; 2299: 2300: my ($udom,$what)=split(/:/,$tail); 2301: chomp($what); 2302: my @pairs=split(/\&/,$what); 2303: my $hashref = TieDomainHash($udom, "ids", &GDBM_WRCREAT(), 2304: "P", $what); 2305: if ($hashref) { 2306: foreach my $pair (@pairs) { 2307: my ($key,$value)=split(/=/,$pair); 2308: $hashref->{$key}=$value; 2309: } 2310: if (untie(%$hashref)) { 2311: Reply($client, "ok\n", $userinput); 2312: } else { 2313: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2314: "while attempting idput\n", $userinput); 2315: } 2316: } else { 2317: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2318: "while attempting idput\n", $userinput); 2319: } 2320: 2321: return 1; 2322: } 2323: 2324: RegisterHandler("idput", \&PutIdHandler, 0, 1, 0); 2325: # 2326: # Retrieves a set of id values from the id database. 2327: # Returns an & separated list of results, one for each requested id to the 2328: # client. 2329: # 2330: # Parameters: 2331: # $cmd - Command keyword that caused us to be dispatched. 2332: # $tail - Tail of the command. Consists of a colon separated: 2333: # domain - the domain whose id table we dump 2334: # ids Consists of an & separated list of 2335: # id keywords whose values will be fetched. 2336: # nonexisting keywords will have an empty value. 2337: # $client - Socket open on the client. 2338: # 2339: # Returns: 2340: # 1 - indicating processing should continue. 2341: # Side effects: 2342: # An & separated list of results is written to $client. 2343: # 2344: sub GetIdHandler { 2345: my $cmd = shift; 2346: my $tail = shift; 2347: my $client = shift; 2348: 2349: my $userinput = "$client:$tail"; 2350: 2351: my ($udom,$what)=split(/:/,$tail); 2352: chomp($what); 2353: my @queries=split(/\&/,$what); 2354: my $qresult=''; 2355: my $hashref = TieDomainHash($udom, "ids", &GDBM_READER()); 2356: if ($hashref) { 2357: for (my $i=0;$i<=$#queries;$i++) { 2358: $qresult.="$hashref->{$queries[$i]}&"; 2359: } 2360: if (untie(%$hashref)) { 2361: $qresult=~s/\&$//; 2362: Reply($client, "$qresult\n", $userinput); 2363: } else { 2364: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 2365: "while attempting idget\n",$userinput); 2366: } 2367: } else { 2368: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2369: "while attempting idget\n",$userinput); 2370: } 2371: 2372: return 1; 2373: } 2374: 2375: RegisterHandler("idget", \&GetIdHandler, 0, 1, 0); 2376: # 2377: # Process the tmpput command I'm not sure what this does.. Seems to 2378: # create a file in the lonDaemons/tmp directory of the form $id.tmp 2379: # where Id is the client's ip concatenated with a sequence number. 2380: # The file will contain some value that is passed in. Is this e.g. 2381: # a login token? 2382: # 2383: # Parameters: 2384: # $cmd - The command that got us dispatched. 2385: # $tail - The remainder of the request following $cmd: 2386: # In this case this will be the contents of the file. 2387: # $client - Socket connected to the client. 2388: # Returns: 2389: # 1 indicating processing can continue. 2390: # Side effects: 2391: # A file is created in the local filesystem. 2392: # A reply is sent to the client. 2393: sub TmpPutHandler { 2394: my $cmd = shift; 2395: my $what = shift; 2396: my $client = shift; 2397: 2398: my $userinput = "$cmd:$what"; # Reconstruct for logging. 2399: 2400: 2401: my $store; 2402: $tmpsnum++; 2403: my $id=$$.'_'.$clientip.'_'.$tmpsnum; 2404: $id=~s/\W/\_/g; 2405: $what=~s/\n//g; 2406: my $execdir=$perlvar{'lonDaemons'}; 2407: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) { 2408: print $store $what; 2409: close $store; 2410: Reply($client, "$id\n", $userinput); 2411: } else { 2412: Failure( $client, "error: ".($!+0)."IO::File->new Failed ". 2413: "while attempting tmpput\n", $userinput); 2414: } 2415: return 1; 2416: 2417: } 2418: RegisterHandler("tmpput", \&TmpPutHandler, 0, 1, 0); 2419: 2420: # Processes the tmpget command. This command returns the contents 2421: # of a temporary resource file(?) created via tmpput. 2422: # 2423: # Paramters: 2424: # $cmd - Command that got us dispatched. 2425: # $id - Tail of the command, contain the id of the resource 2426: # we want to fetch. 2427: # $client - socket open on the client. 2428: # Return: 2429: # 1 - Inidcating processing can continue. 2430: # Side effects: 2431: # A reply is sent to the client. 2432: 2433: # 2434: sub TmpGetHandler { 2435: my $cmd = shift; 2436: my $id = shift; 2437: my $client = shift; 2438: my $userinput = "$cmd:$id"; 2439: 2440: 2441: $id=~s/\W/\_/g; 2442: my $store; 2443: my $execdir=$perlvar{'lonDaemons'}; 2444: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) { 2445: my $reply=<$store>; 2446: Reply( $client, "$reply\n", $userinput); 2447: close $store; 2448: } else { 2449: Failure( $client, "error: ".($!+0)."IO::File->new Failed ". 2450: "while attempting tmpget\n", $userinput); 2451: } 2452: 2453: return 1; 2454: } 2455: RegisterHandler("tmpget", \&TmpGetHandler, 0, 1, 0); 2456: # 2457: # Process the tmpdel command. This command deletes a temp resource 2458: # created by the tmpput command. 2459: # 2460: # Parameters: 2461: # $cmd - Command that got us here. 2462: # $id - Id of the temporary resource created. 2463: # $client - socket open on the client process. 2464: # 2465: # Returns: 2466: # 1 - Indicating processing should continue. 2467: # Side Effects: 2468: # A file is deleted 2469: # A reply is sent to the client. 2470: sub TmpDelHandler { 2471: my $cmd = shift; 2472: my $id = shift; 2473: my $client = shift; 2474: 2475: my $userinput= "$cmd:$id"; 2476: 2477: chomp($id); 2478: $id=~s/\W/\_/g; 2479: my $execdir=$perlvar{'lonDaemons'}; 2480: if (unlink("$execdir/tmp/$id.tmp")) { 2481: Reply($client, "ok\n", $userinput); 2482: } else { 2483: Failure( $client, "error: ".($!+0)."Unlink tmp Failed ". 2484: "while attempting tmpdel\n", $userinput); 2485: } 2486: 2487: return 1; 2488: 2489: } 2490: RegisterHandler("tmpdel", \&TmpDelHandler, 0, 1, 0); 2491: # 2492: # ls - list the contents of a directory. For each file in the 2493: # selected directory the filename followed by the full output of 2494: # the stat function is returned. The returned info for each 2495: # file are separated by ':'. The stat fields are separated by &'s. 2496: # Parameters: 2497: # $cmd - The command that dispatched us (ls). 2498: # $ulsdir - The directory path to list... I'm not sure what this 2499: # is relative as things like ls:. return e.g. 2500: # no_such_dir. 2501: # $client - Socket open on the client. 2502: # Returns: 2503: # 1 - indicating that the daemon should not disconnect. 2504: # Side Effects: 2505: # The reply is written to $client. 2506: # 2507: sub LsHandler { 2508: my $cmd = shift; 2509: my $ulsdir = shift; 2510: my $client = shift; 2511: 2512: my $userinput = "$cmd:$ulsdir"; 2513: 2514: chomp($ulsdir); 2515: 2516: my $ulsout=''; 2517: my $ulsfn; 2518: logthis("ls for '$ulsdir'"); 2519: if (-e $ulsdir) { 2520: logthis("ls - directory exists"); 2521: if(-d $ulsdir) { 2522: logthis("ls $ulsdir is a file"); 2523: if (opendir(LSDIR,$ulsdir)) { 2524: while ($ulsfn=readdir(LSDIR)) { 2525: my @ulsstats=stat($ulsdir.'/'.$ulsfn); 2526: $ulsout.=$ulsfn.'&'. 2527: join('&',@ulsstats).':'; 2528: } 2529: closedir(LSDIR); 2530: } 2531: } else { 2532: my @ulsstats=stat($ulsdir); 2533: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':'; 2534: } 2535: } else { 2536: $ulsout='no_such_dir'; 2537: } 2538: if ($ulsout eq '') { $ulsout='empty'; } 2539: Reply($client, "$ulsout\n", $userinput); 2540: 2541: 2542: return 1; 2543: } 2544: RegisterHandler("ls", \&LsHandler, 0, 1, 0); 2545: 2546: 2547: # 2548: # Processes the setannounce command. This command 2549: # creates a file named announce.txt in the top directory of 2550: # the documentn root and sets its contents. The announce.txt file is 2551: # printed in its entirety at the LonCAPA login page. Note: 2552: # once the announcement.txt fileis created it cannot be deleted. 2553: # However, setting the contents of the file to empty removes the 2554: # announcement from the login page of loncapa so who cares. 2555: # 2556: # Parameters: 2557: # $cmd - The command that got us dispatched. 2558: # $announcement - The text of the announcement. 2559: # $client - Socket open on the client process. 2560: # Retunrns: 2561: # 1 - Indicating request processing should continue 2562: # Side Effects: 2563: # The file {DocRoot}/announcement.txt is created. 2564: # A reply is sent to $client. 2565: # 2566: sub SetAnnounceHandler { 2567: my $cmd = shift; 2568: my $announcement = shift; 2569: my $client = shift; 2570: 2571: my $userinput = "$cmd:$announcement"; 2572: 2573: chomp($announcement); 2574: $announcement=&unescape($announcement); 2575: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}. 2576: '/announcement.txt')) { 2577: print $store $announcement; 2578: close $store; 2579: Reply($client, "ok\n", $userinput); 2580: } else { 2581: Failure($client, "error: ".($!+0)."\n", $userinput); 2582: } 2583: 2584: return 1; 2585: } 2586: RegisterHandler("setannounce", \&SetAnnounceHandler, 0, 1, 0); 2587: 2588: # 2589: # Return the version of the daemon. This can be used to determine 2590: # the compatibility of cross version installations or, alternatively to 2591: # simply know who's out of date and who isn't. Note that the version 2592: # is returned concatenated with the tail. 2593: # Parameters: 2594: # $cmd - the request that dispatched to us. 2595: # $tail - Tail of the request (client's version?). 2596: # $client - Socket open on the client. 2597: #Returns: 2598: # 1 - continue processing requests. 2599: # Side Effects: 2600: # Replies with version to $client. 2601: sub GetVersionHandler { 2602: my $client = shift; 2603: my $tail = shift; 2604: my $client = shift; 2605: my $userinput = $client; 2606: 2607: Reply($client, &version($userinput)."\n", $userinput); 2608: 2609: 2610: return 1; 2611: } 2612: RegisterHandler("version", \&GetVersionHandler, 0, 1, 0); 2613: 2614: # Set the current host and domain. This is used to support 2615: # multihomed systems. Each IP of the system, or even separate daemons 2616: # on the same IP can be treated as handling a separate lonCAPA virtual 2617: # machine. This command selects the virtual lonCAPA. The client always 2618: # knows the right one since it is lonc and it is selecting the domain/system 2619: # from the hosts.tab file. 2620: # Parameters: 2621: # $cmd - Command that dispatched us. 2622: # $tail - Tail of the command (domain/host requested). 2623: # $socket - Socket open on the client. 2624: # 2625: # Returns: 2626: # 1 - Indicates the program should continue to process requests. 2627: # Side-effects: 2628: # The default domain/system context is modified for this daemon. 2629: # a reply is sent to the client. 2630: # 2631: sub SelectHostHandler { 2632: my $cmd = shift; 2633: my $tail = shift; 2634: my $socket = shift; 2635: 2636: my $userinput ="$cmd:$tail"; 2637: 2638: Reply($client, &sethost($userinput)."\n", $userinput); 2639: 2640: 2641: return 1; 2642: } 2643: RegisterHandler("sethost", \&SelectHostHandler, 0, 1, 0); 2644: 2645: # Process a request to exit: 2646: # - "bye" is sent to the client. 2647: # - The client socket is shutdown and closed. 2648: # - We indicate to the caller that we should exit. 2649: # Formal Parameters: 2650: # $cmd - The command that got us here. 2651: # $tail - Tail of the command (empty). 2652: # $client - Socket open on the tail. 2653: # Returns: 2654: # 0 - Indicating the program should exit!! 2655: # 2656: sub ExitHandler { 2657: my $cmd = shift; 2658: my $tail = shift; 2659: my $client = shift; 2660: 2661: my $userinput = "$cmd:$tail"; 2662: 2663: &logthis("Client $clientip ($clientname) hanging up: $userinput"); 2664: Reply($client, "bye\n", $userinput); 2665: $client->shutdown(2); # shutdown the socket forcibly. 2666: $client->close(); 2667: 2668: return 0; 2669: } 2670: RegisterHandler("exit", \&ExitHandler, 0, 1,1); 2671: RegisterHandler("init", \&ExitHandler, 0, 1,1); # RE-init is like exit. 2672: RegisterHandler("quit", \&ExitHandler, 0, 1,1); # I like this too! 2673: #------------------------------------------------------------------------------------ 2674: # 2675: # Process a Request. Takes a request from the client validates 2676: # it and performs the operation requested by it. Returns 2677: # a response to the client. 2678: # 2679: # Parameters: 2680: # request - A string containing the user's request. 2681: # Returns: 2682: # 0 - Requested to exit, caller should shut down. 2683: # 1 - Accept additional requests from the client. 2684: # 2685: sub ProcessRequest { 2686: my $Request = shift; 2687: my $KeepGoing = 1; # Assume we're not asked to stop. 2688: 2689: my $wasenc=0; 2690: my $userinput = $Request; # for compatibility with oldcode <yeach> 2691: 2692: 2693: # ------------------------------------------------------------ See if encrypted 2694: 2695: if($userinput =~ /^enc/) { 2696: $wasenc = 1; 2697: $userinput = Decipher($userinput); 2698: if(! $userinput) { 2699: Failure($client,"error:Encrypted data without negotiating key"); 2700: return 0; # Break off with this imposter. 2701: } 2702: } 2703: # Split off the request keyword from the rest of the stuff. 2704: 2705: my ($command, $tail) = split(/:/, $userinput, 2); 2706: chomp($command); 2707: chomp($tail); 2708: $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet. 2709: 2710: Debug("Command received: $command, encoded = $wasenc"); 2711: 2712: 2713: # ------------------------------------------------------------- Normal commands 2714: 2715: # 2716: # If the command is in the hash, then execute it via the hash dispatch: 2717: # 2718: if(defined $Dispatcher{$command}) { 2719: 2720: my $DispatchInfo = $Dispatcher{$command}; 2721: my $Handler = $$DispatchInfo[0]; 2722: my $NeedEncode = $$DispatchInfo[1]; 2723: my $ClientTypes = $$DispatchInfo[2]; 2724: Debug("Matched dispatch hash: mustencode: $NeedEncode ClientType $ClientTypes"); 2725: 2726: # Validate the request: 2727: 2728: my $ok = 1; 2729: my $requesterprivs = 0; 2730: if(isClient()) { 2731: $requesterprivs |= $CLIENT_OK; 2732: } 2733: if(isManager()) { 2734: $requesterprivs |= $MANAGER_OK; 2735: } 2736: if($NeedEncode && (!$wasenc)) { 2737: Debug("Must encode but wasn't: $NeedEncode $wasenc"); 2738: $ok = 0; 2739: } 2740: if(($ClientTypes & $requesterprivs) == 0) { 2741: Debug("Client not privileged to do this operation"); 2742: $ok = 0; 2743: } 2744: 2745: if($ok) { 2746: Debug("Dispatching to handler $command $tail"); 2747: $KeepGoing = &$Handler($command, $tail, $client); 2748: } else { 2749: Debug("Refusing to dispatch because ok is false"); 2750: Failure($client, "refused\n", $userinput); 2751: } 2752: 2753: 2754: # ------------------------------------------------------------- unknown command 2755: 2756: } else { 2757: # unknown command 2758: Failure($client, "unknown_cmd\n", $userinput); 2759: } 2760: 2761: return $KeepGoing; 2762: } 2763: 2764: 2765: # 2766: # GetCertificate: Given a transaction that requires a certificate, 2767: # this function will extract the certificate from the transaction 2768: # request. Note that at this point, the only concept of a certificate 2769: # is the hostname to which we are connected. 2770: # 2771: # Parameter: 2772: # request - The request sent by our client (this parameterization may 2773: # need to change when we really use a certificate granting 2774: # authority. 2775: # 2776: sub GetCertificate { 2777: my $request = shift; 2778: 2779: return $clientip; 2780: } 2781: 2782: 2783: 2784: # 2785: # ReadManagerTable: Reads in the current manager table. For now this is 2786: # done on each manager authentication because: 2787: # - These authentications are not frequent 2788: # - This allows dynamic changes to the manager table 2789: # without the need to signal to the lond. 2790: # 2791: 2792: sub ReadManagerTable { 2793: 2794: # Clean out the old table first.. 2795: 2796: foreach my $key (keys %managers) { 2797: delete $managers{$key}; 2798: } 2799: 2800: my $tablename = $perlvar{'lonTabDir'}."/managers.tab"; 2801: if (!open (MANAGERS, $tablename)) { 2802: logthis('No manager table. Nobody can manage!!'); 2803: return; 2804: } 2805: while(my $host = <MANAGERS>) { 2806: chomp($host); 2807: if ($host =~ "^#") { # Comment line. 2808: logthis(' Skipping line: '. "$host\n"); 2809: next; 2810: } 2811: if (!defined $hostip{$host}) { # This is a non cluster member 2812: # The entry is of the form: 2813: # cluname:hostname 2814: # cluname - A 'cluster hostname' is needed in order to negotiate 2815: # the host key. 2816: # hostname- The dns name of the host. 2817: # 2818: my($cluname, $dnsname) = split(/:/, $host); 2819: 2820: my $ip = gethostbyname($dnsname); 2821: if(defined($ip)) { # bad names don't deserve entry. 2822: my $hostip = inet_ntoa($ip); 2823: $managers{$hostip} = $cluname; 2824: logthis(' registering manager '. 2825: "$dnsname as $cluname with $hostip \n"); 2826: } 2827: } else { 2828: logthis(' existing host'." $host\n"); 2829: $managers{$hostip{$host}} = $host; # Use info from cluster tab if clumemeber 2830: } 2831: } 2832: } 2833: 2834: # 2835: # ValidManager: Determines if a given certificate represents a valid manager. 2836: # in this primitive implementation, the 'certificate' is 2837: # just the connecting loncapa client name. This is checked 2838: # against a valid client list in the configuration. 2839: # 2840: # 2841: sub ValidManager { 2842: my $certificate = shift; 2843: 2844: return isManager; 2845: } 2846: # 2847: # CopyFile: Called as part of the process of installing a 2848: # new configuration file. This function copies an existing 2849: # file to a backup file. 2850: # Parameters: 2851: # oldfile - Name of the file to backup. 2852: # newfile - Name of the backup file. 2853: # Return: 2854: # 0 - Failure (errno has failure reason). 2855: # 1 - Success. 2856: # 2857: sub CopyFile { 2858: my $oldfile = shift; 2859: my $newfile = shift; 2860: 2861: # The file must exist: 2862: 2863: if(-e $oldfile) { 2864: 2865: # Read the old file. 2866: 2867: my $oldfh = IO::File->new("< $oldfile"); 2868: if(!$oldfh) { 2869: return 0; 2870: } 2871: my @contents = <$oldfh>; # Suck in the entire file. 2872: 2873: # write the backup file: 2874: 2875: my $newfh = IO::File->new("> $newfile"); 2876: if(!(defined $newfh)){ 2877: return 0; 2878: } 2879: my $lines = scalar @contents; 2880: for (my $i =0; $i < $lines; $i++) { 2881: print $newfh ($contents[$i]); 2882: } 2883: 2884: $oldfh->close; 2885: $newfh->close; 2886: 2887: chmod(0660, $newfile); 2888: 2889: return 1; 2890: 2891: } else { 2892: return 0; 2893: } 2894: } 2895: # 2896: # Host files are passed out with externally visible host IPs. 2897: # If, for example, we are behind a fire-wall or NAT host, our 2898: # internally visible IP may be different than the externally 2899: # visible IP. Therefore, we always adjust the contents of the 2900: # host file so that the entry for ME is the IP that we believe 2901: # we have. At present, this is defined as the entry that 2902: # DNS has for us. If by some chance we are not able to get a 2903: # DNS translation for us, then we assume that the host.tab file 2904: # is correct. 2905: # BUGBUGBUG - in the future, we really should see if we can 2906: # easily query the interface(s) instead. 2907: # Parameter(s): 2908: # contents - The contents of the host.tab to check. 2909: # Returns: 2910: # newcontents - The adjusted contents. 2911: # 2912: # 2913: sub AdjustHostContents { 2914: my $contents = shift; 2915: my $adjusted; 2916: my $me = $perlvar{'lonHostID'}; 2917: 2918: foreach my $line (split(/\n/,$contents)) { 2919: if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) { 2920: chomp($line); 2921: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line); 2922: if ($id eq $me) { 2923: my $ip = gethostbyname($name); 2924: my $ipnew = inet_ntoa($ip); 2925: $ip = $ipnew; 2926: # Reconstruct the host line and append to adjusted: 2927: 2928: my $newline = "$id:$domain:$role:$name:$ip"; 2929: if($maxcon ne "") { # Not all hosts have loncnew tuning params 2930: $newline .= ":$maxcon:$idleto:$mincon"; 2931: } 2932: $adjusted .= $newline."\n"; 2933: 2934: } else { # Not me, pass unmodified. 2935: $adjusted .= $line."\n"; 2936: } 2937: } else { # Blank or comment never re-written. 2938: $adjusted .= $line."\n"; # Pass blanks and comments as is. 2939: } 2940: } 2941: return $adjusted; 2942: } 2943: # 2944: # InstallFile: Called to install an administrative file: 2945: # - The file is created with <name>.tmp 2946: # - The <name>.tmp file is then mv'd to <name> 2947: # This lugubrious procedure is done to ensure that we are never without 2948: # a valid, even if dated, version of the file regardless of who crashes 2949: # and when the crash occurs. 2950: # 2951: # Parameters: 2952: # Name of the file 2953: # File Contents. 2954: # Return: 2955: # nonzero - success. 2956: # 0 - failure and $! has an errno. 2957: # 2958: sub InstallFile { 2959: my $Filename = shift; 2960: my $Contents = shift; 2961: my $TempFile = $Filename.".tmp"; 2962: 2963: # Open the file for write: 2964: 2965: my $fh = IO::File->new("> $TempFile"); # Write to temp. 2966: if(!(defined $fh)) { 2967: &logthis(' Unable to create '.$TempFile.""); 2968: return 0; 2969: } 2970: # write the contents of the file: 2971: 2972: print $fh ($Contents); 2973: $fh->close; # In case we ever have a filesystem w. locking 2974: 2975: chmod(0660, $TempFile); 2976: 2977: # Now we can move install the file in position. 2978: 2979: move($TempFile, $Filename); 2980: 2981: return 1; 2982: } 2983: # 2984: # ConfigFileFromSelector: converts a configuration file selector 2985: # (one of host or domain at this point) into a 2986: # configuration file pathname. 2987: # 2988: # Parameters: 2989: # selector - Configuration file selector. 2990: # Returns: 2991: # Full path to the file or undef if the selector is invalid. 2992: # 2993: sub ConfigFileFromSelector { 2994: my $selector = shift; 2995: my $tablefile; 2996: 2997: my $tabledir = $perlvar{'lonTabDir'}.'/'; 2998: if ($selector eq "hosts") { 2999: $tablefile = $tabledir."hosts.tab"; 3000: } elsif ($selector eq "domain") { 3001: $tablefile = $tabledir."domain.tab"; 3002: } else { 3003: return undef; 3004: } 3005: return $tablefile; 3006: 3007: } 3008: # 3009: # PushFile: Called to do an administrative push of a file. 3010: # - Ensure the file being pushed is one we support. 3011: # - Backup the old file to <filename.saved> 3012: # - Separate the contents of the new file out from the 3013: # rest of the request. 3014: # - Write the new file. 3015: # Parameter: 3016: # Request - The entire user request. This consists of a : separated 3017: # string pushfile:tablename:contents. 3018: # NOTE: The contents may have :'s in it as well making things a bit 3019: # more interesting... but not much. 3020: # Returns: 3021: # String to send to client ("ok" or "refused" if bad file). 3022: # 3023: sub PushFile { 3024: my $request = shift; 3025: my ($command, $filename, $contents) = split(":", $request, 3); 3026: 3027: # At this point in time, pushes for only the following tables are 3028: # supported: 3029: # hosts.tab ($filename eq host). 3030: # domain.tab ($filename eq domain). 3031: # Construct the destination filename or reject the request. 3032: # 3033: # lonManage is supposed to ensure this, however this session could be 3034: # part of some elaborate spoof that managed somehow to authenticate. 3035: # 3036: 3037: 3038: my $tablefile = ConfigFileFromSelector($filename); 3039: if(! (defined $tablefile)) { 3040: return "refused"; 3041: } 3042: # 3043: # >copy< the old table to the backup table 3044: # don't rename in case system crashes/reboots etc. in the time 3045: # window between a rename and write. 3046: # 3047: my $backupfile = $tablefile; 3048: $backupfile =~ s/\.tab$/.old/; 3049: if(!CopyFile($tablefile, $backupfile)) { 3050: &logthis(' CopyFile from '.$tablefile." to ".$backupfile." failed "); 3051: return "error:$!"; 3052: } 3053: &logthis(' Pushfile: backed up ' 3054: .$tablefile." to $backupfile"); 3055: 3056: # If the file being pushed is the host file, we adjust the entry for ourself so that the 3057: # IP will be our current IP as looked up in dns. Note this is only 99% good as it's possible 3058: # to conceive of conditions where we don't have a DNS entry locally. This is possible in a 3059: # network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now) 3060: # that possibilty. 3061: 3062: if($filename eq "host") { 3063: $contents = AdjustHostContents($contents); 3064: } 3065: 3066: # Install the new file: 3067: 3068: if(!InstallFile($tablefile, $contents)) { 3069: &logthis(' Pushfile: unable to install ' 3070: .$tablefile." $! "); 3071: return "error:$!"; 3072: } else { 3073: &logthis(' Installed new '.$tablefile 3074: .""); 3075: 3076: } 3077: 3078: 3079: # Indicate success: 3080: 3081: return "ok"; 3082: 3083: } 3084: 3085: # 3086: # Called to re-init either lonc or lond. 3087: # 3088: # Parameters: 3089: # request - The full request by the client. This is of the form 3090: # reinit:<process> 3091: # where <process> is allowed to be either of 3092: # lonc or lond 3093: # 3094: # Returns: 3095: # The string to be sent back to the client either: 3096: # ok - Everything worked just fine. 3097: # error:why - There was a failure and why describes the reason. 3098: # 3099: # 3100: sub ReinitProcess { 3101: my $request = shift; 3102: 3103: 3104: # separate the request (reinit) from the process identifier and 3105: # validate it producing the name of the .pid file for the process. 3106: # 3107: # 3108: my ($junk, $process) = split(":", $request); 3109: my $processpidfile = $perlvar{'lonDaemons'}.'/logs/'; 3110: if($process eq 'lonc') { 3111: $processpidfile = $processpidfile."lonc.pid"; 3112: if (!open(PIDFILE, "< $processpidfile")) { 3113: return "error:Open failed for $processpidfile"; 3114: } 3115: my $loncpid = <PIDFILE>; 3116: close(PIDFILE); 3117: logthis(' Reinitializing lonc pid='.$loncpid 3118: .""); 3119: kill("USR2", $loncpid); 3120: } elsif ($process eq 'lond') { 3121: logthis(' Reinitializing self (lond) '); 3122: &UpdateHosts; # Lond is us!! 3123: } else { 3124: &logthis('"); 3126: return "error:Invalid process identifier $process"; 3127: } 3128: return 'ok'; 3129: } 3130: # Validate a line in a configuration file edit script: 3131: # Validation includes: 3132: # - Ensuring the command is valid. 3133: # - Ensuring the command has sufficient parameters 3134: # Parameters: 3135: # scriptline - A line to validate (\n has been stripped for what it's worth). 3136: # 3137: # Return: 3138: # 0 - Invalid scriptline. 3139: # 1 - Valid scriptline 3140: # NOTE: 3141: # Only the command syntax is checked, not the executability of the 3142: # command. 3143: # 3144: sub isValidEditCommand { 3145: my $scriptline = shift; 3146: 3147: # Line elements are pipe separated: 3148: 3149: my ($command, $key, $newline) = split(/\|/, $scriptline); 3150: &logthis(' isValideditCommand checking: '. 3151: "Command = '$command', Key = '$key', Newline = '$newline' \n"); 3152: 3153: if ($command eq "delete") { 3154: # 3155: # key with no newline. 3156: # 3157: if( ($key eq "") || ($newline ne "")) { 3158: return 0; # Must have key but no newline. 3159: } else { 3160: return 1; # Valid syntax. 3161: } 3162: } elsif ($command eq "replace") { 3163: # 3164: # key and newline: 3165: # 3166: if (($key eq "") || ($newline eq "")) { 3167: return 0; 3168: } else { 3169: return 1; 3170: } 3171: } elsif ($command eq "append") { 3172: if (($key ne "") && ($newline eq "")) { 3173: return 1; 3174: } else { 3175: return 0; 3176: } 3177: } else { 3178: return 0; # Invalid command. 3179: } 3180: return 0; # Should not get here!!! 3181: } 3182: # 3183: # ApplyEdit - Applies an edit command to a line in a configuration 3184: # file. It is the caller's responsiblity to validate the 3185: # edit line. 3186: # Parameters: 3187: # $directive - A single edit directive to apply. 3188: # Edit directives are of the form: 3189: # append|newline - Appends a new line to the file. 3190: # replace|key|newline - Replaces the line with key value 'key' 3191: # delete|key - Deletes the line with key value 'key'. 3192: # $editor - A config file editor object that contains the 3193: # file being edited. 3194: # 3195: sub ApplyEdit { 3196: my $directive = shift; 3197: my $editor = shift; 3198: 3199: # Break the directive down into its command and its parameters 3200: # (at most two at this point. The meaning of the parameters, if in fact 3201: # they exist depends on the command). 3202: 3203: my ($command, $p1, $p2) = split(/\|/, $directive); 3204: 3205: if($command eq "append") { 3206: $editor->Append($p1); # p1 - key p2 null. 3207: } elsif ($command eq "replace") { 3208: $editor->ReplaceLine($p1, $p2); # p1 - key p2 = newline. 3209: } elsif ($command eq "delete") { 3210: $editor->DeleteLine($p1); # p1 - key p2 null. 3211: } else { # Should not get here!!! 3212: die "Invalid command given to ApplyEdit $command"; 3213: } 3214: } 3215: # 3216: # AdjustOurHost: 3217: # Adjusts a host file stored in a configuration file editor object 3218: # for the true IP address of this host. This is necessary for hosts 3219: # that live behind a firewall. 3220: # Those hosts have a publicly distributed IP of the firewall, but 3221: # internally must use their actual IP. We assume that a given 3222: # host only has a single IP interface for now. 3223: # Formal Parameters: 3224: # editor - The configuration file editor to adjust. This 3225: # editor is assumed to contain a hosts.tab file. 3226: # Strategy: 3227: # - Figure out our hostname. 3228: # - Lookup the entry for this host. 3229: # - Modify the line to contain our IP 3230: # - Do a replace for this host. 3231: sub AdjustOurHost { 3232: my $editor = shift; 3233: 3234: # figure out who I am. 3235: 3236: my $myHostName = $perlvar{'lonHostID'}; # LonCAPA hostname. 3237: 3238: # Get my host file entry. 3239: 3240: my $ConfigLine = $editor->Find($myHostName); 3241: if(! (defined $ConfigLine)) { 3242: die "AdjustOurHost - no entry for me in hosts file $myHostName"; 3243: } 3244: # figure out my IP: 3245: # Use the config line to get my hostname. 3246: # Use gethostbyname to translate that into an IP address. 3247: # 3248: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine); 3249: my $BinaryIp = gethostbyname($name); 3250: my $ip = inet_ntoa($ip); 3251: # 3252: # Reassemble the config line from the elements in the list. 3253: # Note that if the loncnew items were not present before, they will 3254: # be now even if they would be empty 3255: # 3256: my $newConfigLine = $id; 3257: foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) { 3258: $newConfigLine .= ":".$item; 3259: } 3260: # Replace the line: 3261: 3262: $editor->ReplaceLine($id, $newConfigLine); 3263: 3264: } 3265: # 3266: # ReplaceConfigFile: 3267: # Replaces a configuration file with the contents of a 3268: # configuration file editor object. 3269: # This is done by: 3270: # - Copying the target file to <filename>.old 3271: # - Writing the new file to <filename>.tmp 3272: # - Moving <filename.tmp> -> <filename> 3273: # This laborious process ensures that the system is never without 3274: # a configuration file that's at least valid (even if the contents 3275: # may be dated). 3276: # Parameters: 3277: # filename - Name of the file to modify... this is a full path. 3278: # editor - Editor containing the file. 3279: # 3280: sub ReplaceConfigFile { 3281: my $filename = shift; 3282: my $editor = shift; 3283: 3284: CopyFile ($filename, $filename.".old"); 3285: 3286: my $contents = $editor->Get(); # Get the contents of the file. 3287: 3288: InstallFile($filename, $contents); 3289: } 3290: # 3291: # 3292: # Called to edit a configuration table file 3293: # Parameters: 3294: # request - The entire command/request sent by lonc or lonManage 3295: # Return: 3296: # The reply to send to the client. 3297: # 3298: sub EditFile { 3299: my $request = shift; 3300: 3301: # Split the command into it's pieces: edit:filetype:script 3302: 3303: my ($request, $filetype, $script) = split(/:/, $request,3); # : in script 3304: 3305: # Check the pre-coditions for success: 3306: 3307: if($request != "edit") { # Something is amiss afoot alack. 3308: return "error:edit request detected, but request != 'edit'\n"; 3309: } 3310: if( ($filetype ne "hosts") && 3311: ($filetype ne "domain")) { 3312: return "error:edit requested with invalid file specifier: $filetype \n"; 3313: } 3314: 3315: # Split the edit script and check it's validity. 3316: 3317: my @scriptlines = split(/\n/, $script); # one line per element. 3318: my $linecount = scalar(@scriptlines); 3319: for(my $i = 0; $i < $linecount; $i++) { 3320: chomp($scriptlines[$i]); 3321: if(!isValidEditCommand($scriptlines[$i])) { 3322: return "error:edit with bad script line: '$scriptlines[$i]' \n"; 3323: } 3324: } 3325: 3326: # Execute the edit operation. 3327: # - Create a config file editor for the appropriate file and 3328: # - execute each command in the script: 3329: # 3330: my $configfile = ConfigFileFromSelector($filetype); 3331: if (!(defined $configfile)) { 3332: return "refused\n"; 3333: } 3334: my $editor = ConfigFileEdit->new($configfile); 3335: 3336: for (my $i = 0; $i < $linecount; $i++) { 3337: ApplyEdit($scriptlines[$i], $editor); 3338: } 3339: # If the file is the host file, ensure that our host is 3340: # adjusted to have our ip: 3341: # 3342: if($filetype eq "host") { 3343: AdjustOurHost($editor); 3344: } 3345: # Finally replace the current file with our file. 3346: # 3347: ReplaceConfigFile($configfile, $editor); 3348: 3349: return "ok\n"; 3350: } 3351: # 3352: # Convert an error return code from lcpasswd to a string value. 3353: # 3354: sub lcpasswdstrerror { 3355: my $ErrorCode = shift; 3356: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) { 3357: return "lcpasswd Unrecognized error return value ".$ErrorCode; 3358: } else { 3359: return $passwderrors[$ErrorCode]; 3360: } 3361: } 3362: 3363: # 3364: # Convert an error return code from lcuseradd to a string value: 3365: # 3366: sub lcuseraddstrerror { 3367: my $ErrorCode = shift; 3368: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) { 3369: return "lcuseradd - Unrecognized error code: ".$ErrorCode; 3370: } else { 3371: return $adderrors[$ErrorCode]; 3372: } 3373: } 3374: 3375: # grabs exception and records it to log before exiting 3376: sub catchexception { 3377: my ($error)=@_; 3378: $SIG{'QUIT'}='DEFAULT'; 3379: $SIG{__DIE__}='DEFAULT'; 3380: &status("Catching exception"); 3381: &logthis("CRITICAL: " 3382: ."ABNORMAL EXIT. Child $$ for server $thisserver died through " 3383: ."a crash with this error msg->[$error]"); 3384: &logthis('Famous last words: '.$status.' - '.$lastlog); 3385: if ($client) { print $client "error: $error\n"; } 3386: $server->close(); 3387: die($error); 3388: } 3389: 3390: sub timeout { 3391: &status("Handling Timeout"); 3392: &logthis("CRITICAL: TIME OUT ".$$.""); 3393: &catchexception('Timeout'); 3394: } 3395: # -------------------------------- Set signal handlers to record abnormal exits 3396: 3397: $SIG{'QUIT'}=\&catchexception; 3398: $SIG{__DIE__}=\&catchexception; 3399: 3400: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf 3401: &status("Read loncapa.conf and loncapa_apache.conf"); 3402: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf'); 3403: %perlvar=%{$perlvarref}; 3404: undef $perlvarref; 3405: 3406: # ----------------------------- Make sure this process is running from user=www 3407: my $wwwid=getpwnam('www'); 3408: if ($wwwid!=$<) { 3409: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; 3410: my $subj="LON: $currenthostid User ID mismatch"; 3411: system("echo 'User ID mismatch. lond must be run as user www.' |\ 3412: mailto $emailto -s '$subj' > /dev/null"); 3413: exit 1; 3414: } 3415: 3416: # --------------------------------------------- Check if other instance running 3417: 3418: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid"; 3419: 3420: if (-e $pidfile) { 3421: my $lfh=IO::File->new("$pidfile"); 3422: my $pide=<$lfh>; 3423: chomp($pide); 3424: if (kill 0 => $pide) { die "already running"; } 3425: } 3426: 3427: # ------------------------------------------------------------- Read hosts file 3428: 3429: 3430: 3431: # establish SERVER socket, bind and listen. 3432: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'}, 3433: Type => SOCK_STREAM, 3434: Proto => 'tcp', 3435: Reuse => 1, 3436: Listen => 10 ) 3437: or die "making socket: $@\n"; 3438: 3439: # --------------------------------------------------------- Do global variables 3440: 3441: # global variables 3442: 3443: my %children = (); # keys are current child process IDs 3444: my $children = 0; # current number of children 3445: 3446: sub REAPER { # takes care of dead children 3447: $SIG{CHLD} = \&REAPER; 3448: &status("Handling child death"); 3449: my $pid = wait; 3450: if (defined($children{$pid})) { 3451: &logthis("Child $pid died"); 3452: $children --; 3453: delete $children{$pid}; 3454: } else { 3455: &logthis("Unknown Child $pid died"); 3456: } 3457: &status("Finished Handling child death"); 3458: } 3459: 3460: sub HUNTSMAN { # signal handler for SIGINT 3461: &status("Killing children (INT)"); 3462: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children 3463: kill 'INT' => keys %children; 3464: &logthis("Free socket: ".shutdown($server,2)); # free up socket 3465: my $execdir=$perlvar{'lonDaemons'}; 3466: unlink("$execdir/logs/lond.pid"); 3467: &logthis("CRITICAL: Shutting down"); 3468: &status("Done killing children"); 3469: exit; # clean up with dignity 3470: } 3471: 3472: sub HUPSMAN { # signal handler for SIGHUP 3473: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children 3474: &status("Killing children for restart (HUP)"); 3475: kill 'INT' => keys %children; 3476: &logthis("Free socket: ".shutdown($server,2)); # free up socket 3477: &logthis("CRITICAL: Restarting"); 3478: my $execdir=$perlvar{'lonDaemons'}; 3479: unlink("$execdir/logs/lond.pid"); 3480: &status("Restarting self (HUP)"); 3481: exec("$execdir/lond"); # here we go again 3482: } 3483: 3484: # 3485: # Kill off hashes that describe the host table prior to re-reading it. 3486: # Hashes affected are: 3487: # %hostid, %hostdom %hostip 3488: # 3489: sub KillHostHashes { 3490: foreach my $key (keys %hostid) { 3491: delete $hostid{$key}; 3492: } 3493: foreach my $key (keys %hostdom) { 3494: delete $hostdom{$key}; 3495: } 3496: foreach my $key (keys %hostip) { 3497: delete $hostip{$key}; 3498: } 3499: } 3500: # 3501: # Read in the host table from file and distribute it into the various hashes: 3502: # 3503: # - %hostid - Indexed by IP, the loncapa hostname. 3504: # - %hostdom - Indexed by loncapa hostname, the domain. 3505: # - %hostip - Indexed by hostid, the Ip address of the host. 3506: sub ReadHostTable { 3507: 3508: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file"; 3509: 3510: while (my $configline=<CONFIG>) { 3511: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline); 3512: chomp($ip); $ip=~s/\D+$//; 3513: $hostid{$ip}=$id; 3514: $hostdom{$id}=$domain; 3515: $hostip{$id}=$ip; 3516: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; } 3517: } 3518: close(CONFIG); 3519: } 3520: # 3521: # Reload the Apache daemon's state. 3522: # This is done by invoking /home/httpd/perl/apachereload 3523: # a setuid perl script that can be root for us to do this job. 3524: # 3525: sub ReloadApache { 3526: my $execdir = $perlvar{'lonDaemons'}; 3527: my $script = $execdir."/apachereload"; 3528: system($script); 3529: } 3530: 3531: # 3532: # Called in response to a USR2 signal. 3533: # - Reread hosts.tab 3534: # - All children connected to hosts that were removed from hosts.tab 3535: # are killed via SIGINT 3536: # - All children connected to previously existing hosts are sent SIGUSR1 3537: # - Our internal hosts hash is updated to reflect the new contents of 3538: # hosts.tab causing connections from hosts added to hosts.tab to 3539: # now be honored. 3540: # 3541: sub UpdateHosts { 3542: &status("Reload hosts.tab"); 3543: logthis(' Updating connections '); 3544: # 3545: # The %children hash has the set of IP's we currently have children 3546: # on. These need to be matched against records in the hosts.tab 3547: # Any ip's no longer in the table get killed off they correspond to 3548: # either dropped or changed hosts. Note that the re-read of the table 3549: # will take care of new and changed hosts as connections come into being. 3550: 3551: 3552: KillHostHashes; 3553: ReadHostTable; 3554: 3555: foreach my $child (keys %children) { 3556: my $childip = $children{$child}; 3557: if(!$hostid{$childip}) { 3558: logthis(' UpdateHosts killing child ' 3559: ." $child for ip $childip "); 3560: kill('INT', $child); 3561: } else { 3562: logthis(' keeping child for ip ' 3563: ." $childip (pid=$child) "); 3564: } 3565: } 3566: ReloadApache; 3567: &status("Finished reloading hosts.tab"); 3568: } 3569: 3570: 3571: sub checkchildren { 3572: &status("Checking on the children (sending signals)"); 3573: &initnewstatus(); 3574: &logstatus(); 3575: &logthis('Going to check on the children'); 3576: my $docdir=$perlvar{'lonDocRoot'}; 3577: foreach (sort keys %children) { 3578: sleep 1; 3579: unless (kill 'USR1' => $_) { 3580: &logthis ('Child '.$_.' is dead'); 3581: &logstatus($$.' is dead'); 3582: } 3583: } 3584: sleep 5; 3585: $SIG{ALRM} = sub { die "timeout" }; 3586: $SIG{__DIE__} = 'DEFAULT'; 3587: &status("Checking on the children (waiting for reports)"); 3588: foreach (sort keys %children) { 3589: unless (-e "$docdir/lon-status/londchld/$_.txt") { 3590: eval { 3591: alarm(300); 3592: &logthis('Child '.$_.' did not respond'); 3593: kill 9 => $_; 3594: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; 3595: #$subj="LON: $currenthostid killed lond process $_"; 3596: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`; 3597: #$execdir=$perlvar{'lonDaemons'}; 3598: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`; 3599: alarm(0); 3600: } 3601: } 3602: } 3603: $SIG{ALRM} = 'DEFAULT'; 3604: $SIG{__DIE__} = \&catchexception; 3605: &status("Finished checking children"); 3606: } 3607: 3608: # --------------------------------------------------------------------- Logging 3609: 3610: sub logthis { 3611: my $message=shift; 3612: my $execdir=$perlvar{'lonDaemons'}; 3613: my $fh=IO::File->new(">>$execdir/logs/lond.log"); 3614: my $now=time; 3615: my $local=localtime($now); 3616: $lastlog=$local.': '.$message; 3617: print $fh "$local ($$): $message\n"; 3618: } 3619: 3620: # ------------------------- Conditional log if $DEBUG true. 3621: sub Debug { 3622: my $message = shift; 3623: if($DEBUG) { 3624: &logthis($message); 3625: } 3626: } 3627: 3628: # 3629: # Sub to do replies to client.. this gives a hook for some 3630: # debug tracing too: 3631: # Parameters: 3632: # fd - File open on client. 3633: # reply - Text to send to client. 3634: # request - Original request from client. 3635: # 3636: # Note: This increments Transactions 3637: # 3638: sub Reply { 3639: alarm(120); 3640: my $fd = shift; 3641: my $reply = shift; 3642: my $request = shift; 3643: 3644: print $fd $reply; 3645: Debug("Request was $request Reply was $reply"); 3646: 3647: $Transactions++; 3648: alarm(0); 3649: 3650: 3651: } 3652: # 3653: # Sub to report a failure. 3654: # This function: 3655: # - Increments the failure statistic counters. 3656: # - Invokes Reply to send the error message to the client. 3657: # Parameters: 3658: # fd - File descriptor open on the client 3659: # reply - Reply text to emit. 3660: # request - The original request message (used by Reply 3661: # to debug if that's enabled. 3662: # Implicit outputs: 3663: # $Failures- The number of failures is incremented. 3664: # Reply (invoked here) sends a message to the 3665: # client: 3666: # 3667: sub Failure { 3668: my $fd = shift; 3669: my $reply = shift; 3670: my $request = shift; 3671: 3672: $Failures++; 3673: Reply($fd, $reply, $request); # That's simple eh? 3674: } 3675: # ------------------------------------------------------------------ Log status 3676: 3677: sub logstatus { 3678: &status("Doing logging"); 3679: my $docdir=$perlvar{'lonDocRoot'}; 3680: { 3681: my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt"); 3682: print $fh $$."\t".$currenthostid."\t".$status."\t".$lastlog."\n"; 3683: $fh->close(); 3684: } 3685: &status("Finished londstatus.txt"); 3686: { 3687: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt"); 3688: print $fh $status."\n".$lastlog."\n".time; 3689: $fh->close(); 3690: } 3691: ResetStatistics; 3692: &status("Finished logging"); 3693: 3694: } 3695: 3696: sub initnewstatus { 3697: my $docdir=$perlvar{'lonDocRoot'}; 3698: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt"); 3699: my $now=time; 3700: my $local=localtime($now); 3701: print $fh "LOND status $local - parent $$\n\n"; 3702: opendir(DIR,"$docdir/lon-status/londchld"); 3703: while (my $filename=readdir(DIR)) { 3704: unlink("$docdir/lon-status/londchld/$filename"); 3705: } 3706: closedir(DIR); 3707: } 3708: 3709: # -------------------------------------------------------------- Status setting 3710: 3711: sub status { 3712: my $what=shift; 3713: my $now=time; 3714: my $local=localtime($now); 3715: my $status = "lond: $what $local "; 3716: if($Transactions) { 3717: $status .= " Transactions: $Transactions Failed; $Failures"; 3718: } 3719: $0=$status; 3720: } 3721: 3722: # -------------------------------------------------------- Escape Special Chars 3723: 3724: sub escape { 3725: my $str=shift; 3726: $str =~ s/(\W)/"%".unpack('H2',$1)/eg; 3727: return $str; 3728: } 3729: 3730: # ----------------------------------------------------- Un-Escape Special Chars 3731: 3732: sub unescape { 3733: my $str=shift; 3734: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; 3735: return $str; 3736: } 3737: 3738: # ----------------------------------------------------------- Send USR1 to lonc 3739: 3740: sub reconlonc { 3741: my $peerfile=shift; 3742: &logthis("Trying to reconnect for $peerfile"); 3743: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid"; 3744: if (my $fh=IO::File->new("$loncfile")) { 3745: my $loncpid=<$fh>; 3746: chomp($loncpid); 3747: if (kill 0 => $loncpid) { 3748: &logthis("lonc at pid $loncpid responding, sending USR1"); 3749: kill USR1 => $loncpid; 3750: } else { 3751: &logthis("CRITICAL: " 3752: ."lonc at pid $loncpid not responding, giving up"); 3753: } 3754: } else { 3755: &logthis('CRITICAL: lonc not running, giving up'); 3756: } 3757: } 3758: 3759: # -------------------------------------------------- Non-critical communication 3760: 3761: sub subreply { 3762: my ($cmd,$server)=@_; 3763: my $peerfile="$perlvar{'lonSockDir'}/$server"; 3764: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile", 3765: Type => SOCK_STREAM, 3766: Timeout => 10) 3767: or return "con_lost"; 3768: print $sclient "$cmd\n"; 3769: my $answer=<$sclient>; 3770: chomp($answer); 3771: if (!$answer) { $answer="con_lost"; } 3772: return $answer; 3773: } 3774: 3775: sub reply { 3776: my ($cmd,$server)=@_; 3777: my $answer; 3778: if ($server ne $currenthostid) { 3779: $answer=subreply($cmd,$server); 3780: if ($answer eq 'con_lost') { 3781: $answer=subreply("ping",$server); 3782: if ($answer ne $server) { 3783: &logthis("sub reply: answer != server answer is $answer, server is $server"); 3784: &reconlonc("$perlvar{'lonSockDir'}/$server"); 3785: } 3786: $answer=subreply($cmd,$server); 3787: } 3788: } else { 3789: $answer='self_reply'; 3790: } 3791: return $answer; 3792: } 3793: 3794: # -------------------------------------------------------------- Talk to lonsql 3795: 3796: sub sqlreply { 3797: my ($cmd)=@_; 3798: my $answer=subsqlreply($cmd); 3799: if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); } 3800: return $answer; 3801: } 3802: 3803: sub subsqlreply { 3804: my ($cmd)=@_; 3805: my $unixsock="mysqlsock"; 3806: my $peerfile="$perlvar{'lonSockDir'}/$unixsock"; 3807: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile", 3808: Type => SOCK_STREAM, 3809: Timeout => 10) 3810: or return "con_lost"; 3811: print $sclient "$cmd\n"; 3812: my $answer=<$sclient>; 3813: chomp($answer); 3814: if (!$answer) { $answer="con_lost"; } 3815: return $answer; 3816: } 3817: 3818: # -------------------------------------------- Return path to profile directory 3819: 3820: sub propath { 3821: my ($udom,$uname)=@_; 3822: Debug("Propath:$udom:$uname"); 3823: $udom=~s/\W//g; 3824: $uname=~s/\W//g; 3825: Debug("Propath2:$udom:$uname"); 3826: my $subdir=$uname.'__'; 3827: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/; 3828: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname"; 3829: Debug("Propath returning $proname"); 3830: return $proname; 3831: } 3832: 3833: # --------------------------------------- Is this the home server of an author? 3834: 3835: sub ishome { 3836: my $author=shift; 3837: Debug("ishome: $author"); 3838: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/; 3839: Debug(" after big regsub: $author"); 3840: my ($udom,$uname)=split(/\//,$author); 3841: Debug(" domain: $udom user: $uname"); 3842: my $proname=propath($udom,$uname); 3843: Debug(" path = $proname"); 3844: if (-e $proname) { 3845: return 'owner'; 3846: } else { 3847: return 'not_owner'; 3848: } 3849: } 3850: 3851: # ======================================================= Continue main program 3852: # ---------------------------------------------------- Fork once and dissociate 3853: 3854: my $fpid=fork; 3855: exit if $fpid; 3856: die "Couldn't fork: $!" unless defined ($fpid); 3857: 3858: POSIX::setsid() or die "Can't start new session: $!"; 3859: 3860: # ------------------------------------------------------- Write our PID on disk 3861: 3862: my $execdir=$perlvar{'lonDaemons'}; 3863: open (PIDSAVE,">$execdir/logs/lond.pid"); 3864: print PIDSAVE "$$\n"; 3865: close(PIDSAVE); 3866: &logthis("CRITICAL: ---------- Starting ----------"); 3867: &status('Starting'); 3868: 3869: 3870: 3871: # ----------------------------------------------------- Install signal handlers 3872: 3873: 3874: $SIG{CHLD} = \&REAPER; 3875: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN; 3876: $SIG{HUP} = \&HUPSMAN; 3877: $SIG{USR1} = \&checkchildren; 3878: $SIG{USR2} = \&UpdateHosts; 3879: 3880: # Read the host hashes: 3881: 3882: ReadHostTable; 3883: 3884: 3885: # -------------------------------------------------------------- 3886: # Accept connections. When a connection comes in, it is validated 3887: # and if good, a child process is created to process transactions 3888: # along the connection. 3889: 3890: while (1) { 3891: &status('Starting accept'); 3892: $client = $server->accept() or next; 3893: &status('Accepted '.$client.' off to spawn'); 3894: make_new_child($client); 3895: &status('Finished spawning'); 3896: } 3897: 3898: sub make_new_child { 3899: my $pid; 3900: my $sigset; 3901: 3902: $client = shift; 3903: &status('Starting new child '.$client); 3904: &logthis(' Attempting to start child ('.$client. 3905: ")"); 3906: # block signal for fork 3907: $sigset = POSIX::SigSet->new(SIGINT); 3908: sigprocmask(SIG_BLOCK, $sigset) 3909: or die "Can't block SIGINT for fork: $!\n"; 3910: 3911: die "fork: $!" unless defined ($pid = fork); 3912: 3913: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of 3914: # connection liveness. 3915: 3916: # 3917: # Figure out who we're talking to so we can record the peer in 3918: # the pid hash. 3919: # 3920: my $caller = getpeername($client); 3921: my ($port,$iaddr)=unpack_sockaddr_in($caller); 3922: $clientip=inet_ntoa($iaddr); 3923: 3924: if ($pid) { 3925: # Parent records the child's birth and returns. 3926: sigprocmask(SIG_UNBLOCK, $sigset) 3927: or die "Can't unblock SIGINT for fork: $!\n"; 3928: $children{$pid} = $clientip; 3929: $children++; 3930: &status('Started child '.$pid); 3931: return; 3932: } else { 3933: # Child can *not* return from this subroutine. 3934: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before 3935: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 3936: #don't get intercepted 3937: $SIG{USR1}= \&logstatus; 3938: $SIG{ALRM}= \&timeout; 3939: $lastlog='Forked '; 3940: $status='Forked'; 3941: 3942: # unblock signals 3943: sigprocmask(SIG_UNBLOCK, $sigset) 3944: or die "Can't unblock SIGINT for fork: $!\n"; 3945: 3946: 3947: 3948: &Authen::Krb5::init_context(); 3949: &Authen::Krb5::init_ets(); 3950: 3951: &status('Accepted connection'); 3952: # ============================================================================= 3953: # do something with the connection 3954: # ----------------------------------------------------------------------------- 3955: # see if we know client and check for spoof IP by challenge 3956: 3957: ReadManagerTable; # May also be a manager!! 3958: 3959: my $clientrec=($hostid{$clientip} ne undef); 3960: my $ismanager=($managers{$clientip} ne undef); 3961: $clientname = "[unknonwn]"; 3962: if($clientrec) { # Establish client type. 3963: $ConnectionType = "client"; 3964: $clientname = $hostid{$clientip}; 3965: if($ismanager) { 3966: $ConnectionType = "both"; 3967: } 3968: } else { 3969: $ConnectionType = "manager"; 3970: $clientname = $managers{$clientip}; 3971: } 3972: my $clientok; 3973: if ($clientrec || $ismanager) { 3974: &status("Waiting for init from $clientip $clientname"); 3975: &logthis('INFO: Connection, '. 3976: $clientip. 3977: " ($clientname) connection type = $ConnectionType " ); 3978: &status("Connecting $clientip ($clientname))"); 3979: my $remotereq=<$client>; 3980: $remotereq=~s/[^\w:]//g; 3981: if ($remotereq =~ /^init/) { 3982: &sethost("sethost:$perlvar{'lonHostID'}"); 3983: my $challenge="$$".time; 3984: print $client "$challenge\n"; 3985: &status("Waiting for challenge reply from $clientip ($clientname)"); 3986: $remotereq=<$client>; 3987: $remotereq=~s/\W//g; 3988: if ($challenge eq $remotereq) { 3989: $clientok=1; 3990: print $client "ok\n"; 3991: } else { 3992: &logthis("WARNING: $clientip did not reply challenge"); 3993: &status('No challenge reply '.$clientip); 3994: } 3995: } else { 3996: &logthis("WARNING: " 3997: ."$clientip failed to initialize: >$remotereq< "); 3998: &status('No init '.$clientip); 3999: } 4000: } else { 4001: &logthis("WARNING: Unknown client $clientip"); 4002: &status('Hung up on '.$clientip); 4003: } 4004: if ($clientok) { 4005: # ---------------- New known client connecting, could mean machine online again 4006: 4007: foreach my $id (keys(%hostip)) { 4008: if ($hostip{$id} ne $clientip || 4009: $hostip{$currenthostid} eq $clientip) { 4010: # no need to try to do recon's to myself 4011: next; 4012: } 4013: &reconlonc("$perlvar{'lonSockDir'}/$id"); 4014: } 4015: &logthis("Established connection: $clientname"); 4016: &status('Will listen to '.$clientname); 4017: 4018: ResetStatistics(); 4019: 4020: # ------------------------------------------------------------ Process requests 4021: my $KeepGoing = 1; 4022: while ((my $userinput=GetRequest) && $KeepGoing) { 4023: $KeepGoing = ProcessRequest($userinput); 4024: # -------------------------------------------------------------------- complete 4025: 4026: &status('Listening to '.$clientname); 4027: } 4028: # --------------------------------------------- client unknown or fishy, refuse 4029: } else { 4030: print $client "refused\n"; 4031: $client->close(); 4032: &logthis("WARNING: " 4033: ."Rejected client $clientip, closing connection"); 4034: } 4035: } 4036: 4037: # ============================================================================= 4038: 4039: &logthis("CRITICAL: " 4040: ."Disconnect from $clientip ($clientname)"); 4041: 4042: 4043: # this exit is VERY important, otherwise the child will become 4044: # a producer of more and more children, forking yourself into 4045: # process death. 4046: exit; 4047: 4048: } 4049: 4050: 4051: # 4052: # Checks to see if the input roleput request was to set 4053: # an author role. If so, invokes the lchtmldir script to set 4054: # up a correct public_html 4055: # Parameters: 4056: # request - The request sent to the rolesput subchunk. 4057: # We're looking for /domain/_au 4058: # domain - The domain in which the user is having roles doctored. 4059: # user - Name of the user for which the role is being put. 4060: # authtype - The authentication type associated with the user. 4061: # 4062: sub ManagePermissions { 4063: my $request = shift; 4064: my $domain = shift; 4065: my $user = shift; 4066: my $authtype= shift; 4067: 4068: # See if the request is of the form /$domain/_au 4069: &logthis("request is $request"); 4070: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput... 4071: my $execdir = $perlvar{'lonDaemons'}; 4072: my $userhome= "/home/$user" ; 4073: &logthis("system $execdir/lchtmldir $userhome $user $authtype"); 4074: system("$execdir/lchtmldir $userhome $user $authtype"); 4075: } 4076: } 4077: 4078: # 4079: # Return the full path of a user password file, whether it exists or not. 4080: # Parameters: 4081: # domain - Domain in which the password file lives. 4082: # user - name of the user. 4083: # Returns: 4084: # Full passwd path: 4085: # 4086: sub PasswordPath { 4087: my $domain = shift; 4088: my $user = shift; 4089: 4090: my $path = &propath($domain, $user); 4091: $path .= "/passwd"; 4092: 4093: return $path; 4094: } 4095: 4096: # Password Filename 4097: # Returns the path to a passwd file given domain and user... only if 4098: # it exists. 4099: # Parameters: 4100: # domain - Domain in which to search. 4101: # user - username. 4102: # Returns: 4103: # - If the password file exists returns its path. 4104: # - If the password file does not exist, returns undefined. 4105: # 4106: sub PasswordFilename { 4107: my $domain = shift; 4108: my $user = shift; 4109: 4110: Debug ("PasswordFilename called: dom = $domain user = $user"); 4111: 4112: my $path = PasswordPath($domain, $user); 4113: Debug("PasswordFilename got path: $path"); 4114: if(-e $path) { 4115: return $path; 4116: } else { 4117: return undef; 4118: } 4119: } 4120: 4121: # 4122: # Rewrite the contents of the user's passwd file. 4123: # Parameters: 4124: # domain - domain of the user. 4125: # name - User's name. 4126: # contents - New contents of the file. 4127: # Returns: 4128: # 0 - Failed. 4129: # 1 - Success. 4130: # 4131: sub RewritePwFile { 4132: my $domain = shift; 4133: my $user = shift; 4134: my $contents = shift; 4135: 4136: my $file = PasswordFilename($domain, $user); 4137: if (defined $file) { 4138: my $pf = IO::File->new(">$file"); 4139: if($pf) { 4140: print $pf "$contents\n"; 4141: return 1; 4142: } else { 4143: return 0; 4144: } 4145: } else { 4146: return 0; 4147: } 4148: 4149: } 4150: # 4151: # GetAuthType - Determines the authorization type of a user in a domain. 4152: 4153: # Returns the authorization type or nouser if there is no such user. 4154: # 4155: sub GetAuthType { 4156: my $domain = shift; 4157: my $user = shift; 4158: 4159: Debug("GetAuthType( $domain, $user ) \n"); 4160: my $passwdfile = PasswordFilename($domain, $user); 4161: if( defined $passwdfile ) { 4162: my $pf = IO::File->new($passwdfile); 4163: my $realpassword = <$pf>; 4164: chomp($realpassword); 4165: Debug("Password info = $realpassword\n"); 4166: return $realpassword; 4167: } else { 4168: Debug("Returning nouser"); 4169: return "nouser"; 4170: } 4171: } 4172: 4173: # 4174: # Validate a user given their domain, name and password. This utility 4175: # function is used by both AuthenticateHandler and ChangePasswordHandler 4176: # to validate the login credentials of a user. 4177: # Parameters: 4178: # $domain - The domain being logged into (this is required due to 4179: # the capability for multihomed systems. 4180: # $user - The name of the user being validated. 4181: # $password - The user's propoposed password. 4182: # 4183: # Returns: 4184: # 1 - The domain,user,pasword triplet corresponds to a valid 4185: # user. 4186: # 0 - The domain,user,password triplet is not a valid user. 4187: # 4188: sub ValidateUser { 4189: my $domain = shift; 4190: my $user = shift; 4191: my $password= shift; 4192: 4193: # Why negative ~pi you may well ask? Well this function is about 4194: # authentication, and therefore very important to get right. 4195: # I've initialized the flag that determines whether or not I've 4196: # validated correctly to a value it's not supposed to get. 4197: # At the end of this function. I'll ensure that it's not still that 4198: # value so we don't just wind up returning some accidental value 4199: # as a result of executing an unforseen code path that 4200: # did not set $validated. 4201: 4202: my $validated = -3.14159; 4203: 4204: # How we authenticate is determined by the type of authentication 4205: # the user has been assigned. If the authentication type is 4206: # "nouser", the user does not exist so we will return 0. 4207: 4208: my $contents = GetAuthType($domain, $user); 4209: my ($howpwd, $contentpwd) = split(/:/, $contents); 4210: 4211: my $null = pack("C",0); # Used by kerberos auth types. 4212: 4213: if ($howpwd ne 'nouser') { 4214: 4215: if($howpwd eq "internal") { # Encrypted is in local password file. 4216: $validated = (crypt($password, $contentpwd) eq $contentpwd); 4217: } 4218: elsif ($howpwd eq "unix") { # User is a normal unix user. 4219: $contentpwd = (getpwnam($user))[1]; 4220: if($contentpwd) { 4221: if($contentpwd eq 'x') { # Shadow password file... 4222: my $pwauth_path = "/usr/local/sbin/pwauth"; 4223: open PWAUTH, "|$pwauth_path" or 4224: die "Cannot invoke authentication"; 4225: print PWAUTH "$user\n$password\n"; 4226: close PWAUTH; 4227: $validated = ! $?; 4228: 4229: } else { # Passwords in /etc/passwd. 4230: $validated = (crypt($password, 4231: $contentpwd) eq $contentpwd); 4232: } 4233: } else { 4234: $validated = 0; 4235: } 4236: } 4237: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain. 4238: if(! ($password =~ /$null/) ) { 4239: my $k4error = &Authen::Krb4::get_pw_in_tkt($user, 4240: "", 4241: $contentpwd,, 4242: 'krbtgt', 4243: $contentpwd, 4244: 1, 4245: $password); 4246: if(!$k4error) { 4247: $validated = 1; 4248: } 4249: else { 4250: $validated = 0; 4251: &logthis('krb4: '.$user.', '.$contentpwd.', '. 4252: &Authen::Krb4::get_err_txt($Authen::Krb4::error)); 4253: } 4254: } 4255: else { 4256: $validated = 0; # Password has a match with null. 4257: } 4258: } 4259: elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain. 4260: if(!($password =~ /$null/)) { # Null password not allowed. 4261: my $krbclient = &Authen::Krb5::parse_name($user.'@' 4262: .$contentpwd); 4263: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd; 4264: my $krbserver = &Authen::Krb5::parse_name($krbservice); 4265: my $credentials= &Authen::Krb5::cc_default(); 4266: $credentials->initialize($krbclient); 4267: my $krbreturn = &Authen::KRb5::get_in_tkt_with_password($krbclient, 4268: $krbserver, 4269: $password, 4270: $credentials); 4271: $validated = ($krbreturn == 1); 4272: } 4273: else { 4274: $validated = 0; 4275: } 4276: } 4277: elsif ($howpwd eq "localauth") { 4278: # Authenticate via installation specific authentcation method: 4279: $validated = &localauth::localauth($user, 4280: $password, 4281: $contentpwd); 4282: } 4283: else { # Unrecognized auth is also bad. 4284: $validated = 0; 4285: } 4286: } else { 4287: $validated = 0; 4288: } 4289: # 4290: # $validated has the correct stat of the authentication: 4291: # 4292: 4293: unless ($validated != -3.14159) { 4294: die "ValidateUser - failed to set the value of validated"; 4295: } 4296: return $validated; 4297: } 4298: 4299: # 4300: # Add a line to the subscription list? 4301: # 4302: sub addline { 4303: my ($fname,$hostid,$ip,$newline)=@_; 4304: my $contents; 4305: my $found=0; 4306: my $expr='^'.$hostid.':'.$ip.':'; 4307: $expr =~ s/\./\\\./g; 4308: my $sh; 4309: Debug("Looking for $expr"); 4310: if ($sh=IO::File->new("$fname.subscription")) { 4311: while (my $subline=<$sh>) { 4312: Debug("addline: line: $subline"); 4313: if ($subline !~ /$expr/) { 4314: $contents.= $subline; 4315: } else { 4316: Debug("Found $subline"); 4317: $found=1; 4318: } 4319: } 4320: $sh->close(); 4321: } 4322: $sh=IO::File->new(">$fname.subscription"); 4323: if ($contents) { print $sh $contents; } 4324: if ($newline) { 4325: Debug("Appending $newline"); 4326: print $sh $newline; 4327: } 4328: $sh->close(); 4329: return $found; 4330: } 4331: # 4332: # Get chat messages. 4333: # 4334: sub getchat { 4335: my ($cdom,$cname,$udom,$uname)=@_; 4336: my %hash; 4337: my $proname=&propath($cdom,$cname); 4338: my @entries=(); 4339: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db", 4340: &GDBM_READER(),0640)) { 4341: @entries=map { $_.':'.$hash{$_} } sort keys %hash; 4342: untie %hash; 4343: } 4344: my @participants=(); 4345: my $cutoff=time-60; 4346: if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db", 4347: &GDBM_WRCREAT(),0640)) { 4348: $hash{$uname.':'.$udom}=time; 4349: foreach (sort keys %hash) { 4350: if ($hash{$_}>$cutoff) { 4351: $participants[$#participants+1]='active_participant:'.$_; 4352: } 4353: } 4354: untie %hash; 4355: } 4356: return (@participants,@entries); 4357: } 4358: # 4359: # Add a chat message 4360: # 4361: sub chatadd { 4362: my ($cdom,$cname,$newchat)=@_; 4363: my %hash; 4364: my $proname=&propath($cdom,$cname); 4365: my @entries=(); 4366: my $time=time; 4367: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db", 4368: &GDBM_WRCREAT(),0640)) { 4369: @entries=map { $_.':'.$hash{$_} } sort keys %hash; 4370: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/); 4371: my ($thentime,$idnum)=split(/\_/,$lastid); 4372: my $newid=$time.'_000000'; 4373: if ($thentime==$time) { 4374: $idnum=~s/^0+//; 4375: $idnum++; 4376: $idnum=substr('000000'.$idnum,-6,6); 4377: $newid=$time.'_'.$idnum; 4378: } 4379: $hash{$newid}=$newchat; 4380: my $expired=$time-3600; 4381: foreach (keys %hash) { 4382: my ($thistime)=($_=~/(\d+)\_/); 4383: if ($thistime<$expired) { 4384: delete $hash{$_}; 4385: } 4386: } 4387: untie %hash; 4388: } 4389: { 4390: my $hfh; 4391: if ($hfh=IO::File->new(">>$proname/chatroom.log")) { 4392: print $hfh "$time:".&unescape($newchat)."\n"; 4393: } 4394: } 4395: } 4396: 4397: sub unsub { 4398: my ($fname,$clientip)=@_; 4399: my $result; 4400: my $unsubs = 0; # Number of successful unsubscribes: 4401: 4402: 4403: # An old way subscriptions were handled was to have a 4404: # subscription marker file: 4405: 4406: Debug("Attempting unlink of $fname.$clientname"); 4407: if (unlink("$fname.$clientname")) { 4408: $unsubs++; # Successful unsub via marker file. 4409: } 4410: 4411: # The more modern way to do it is to have a subscription list 4412: # file: 4413: 4414: if (-e "$fname.subscription") { 4415: my $found=&addline($fname,$clientname,$clientip,''); 4416: if ($found) { 4417: $unsubs++; 4418: } 4419: } 4420: 4421: # If either or both of these mechanisms succeeded in unsubscribing a 4422: # resource we can return ok: 4423: 4424: if($unsubs) { 4425: $result = "ok\n"; 4426: } else { 4427: $result = "not_subscribed\n"; 4428: } 4429: 4430: return $result; 4431: } 4432: 4433: sub currentversion { 4434: my $fname=shift; 4435: my $version=-1; 4436: my $ulsdir=''; 4437: if ($fname=~/^(.+)\/[^\/]+$/) { 4438: $ulsdir=$1; 4439: } 4440: my ($fnamere1,$fnamere2); 4441: # remove version if already specified 4442: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/; 4443: # get the bits that go before and after the version number 4444: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) { 4445: $fnamere1=$1; 4446: $fnamere2='.'.$2; 4447: } 4448: if (-e $fname) { $version=1; } 4449: if (-e $ulsdir) { 4450: if(-d $ulsdir) { 4451: if (opendir(LSDIR,$ulsdir)) { 4452: my $ulsfn; 4453: while ($ulsfn=readdir(LSDIR)) { 4454: # see if this is a regular file (ignore links produced earlier) 4455: my $thisfile=$ulsdir.'/'.$ulsfn; 4456: unless (-l $thisfile) { 4457: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) { 4458: if ($1>$version) { $version=$1; } 4459: } 4460: } 4461: } 4462: closedir(LSDIR); 4463: $version++; 4464: } 4465: } 4466: } 4467: return $version; 4468: } 4469: 4470: sub thisversion { 4471: my $fname=shift; 4472: my $version=-1; 4473: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) { 4474: $version=$1; 4475: } 4476: return $version; 4477: } 4478: 4479: sub subscribe { 4480: my ($userinput,$clientip)=@_; 4481: chomp($userinput); 4482: my $result; 4483: my ($cmd,$fname)=split(/:/,$userinput); 4484: my $ownership=&ishome($fname); 4485: Debug("subscribe: Owner = $ownership file: '$fname'"); 4486: if ($ownership eq 'owner') { 4487: # explitly asking for the current version? 4488: unless (-e $fname) { 4489: Debug("subscribe - does not exist"); 4490: my $currentversion=&currentversion($fname); 4491: if (&thisversion($fname)==$currentversion) { 4492: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) { 4493: my $root=$1; 4494: my $extension=$2; 4495: symlink($root.'.'.$extension, 4496: $root.'.'.$currentversion.'.'.$extension); 4497: unless ($extension=~/\.meta$/) { 4498: symlink($root.'.'.$extension.'.meta', 4499: $root.'.'.$currentversion.'.'.$extension.'.meta'); 4500: } 4501: } 4502: } 4503: } 4504: if (-e $fname) { 4505: Debug("subscribe - exists"); 4506: if (-d $fname) { 4507: $result="directory\n"; 4508: } else { 4509: if (-e "$fname.$clientname") {&unsub($fname,$clientip);} 4510: my $now=time; 4511: my $found=&addline($fname,$clientname,$clientip, 4512: "$clientname:$clientip:$now\n"); 4513: if ($found) { $result="$fname\n"; } 4514: # if they were subscribed to only meta data, delete that 4515: # subscription, when you subscribe to a file you also get 4516: # the metadata 4517: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); } 4518: $fname=~s/\/home\/httpd\/html\/res/raw/; 4519: $fname="http://$thisserver/".$fname; 4520: $result="$fname\n"; 4521: } 4522: } else { 4523: $result="not_found\n"; 4524: } 4525: } else { 4526: $result="rejected\n"; 4527: } 4528: return $result; 4529: } 4530: 4531: sub make_passwd_file { 4532: my ($uname, $umode,$npass,$passfilename)=@_; 4533: my $result="ok\n"; 4534: if ($umode eq 'krb4' or $umode eq 'krb5') { 4535: { 4536: my $pf = IO::File->new(">$passfilename"); 4537: print $pf "$umode:$npass\n"; 4538: } 4539: } elsif ($umode eq 'internal') { 4540: my $salt=time; 4541: $salt=substr($salt,6,2); 4542: my $ncpass=crypt($npass,$salt); 4543: { 4544: &Debug("Creating internal auth"); 4545: my $pf = IO::File->new(">$passfilename"); 4546: print $pf "internal:$ncpass\n"; 4547: } 4548: } elsif ($umode eq 'localauth') { 4549: { 4550: my $pf = IO::File->new(">$passfilename"); 4551: print $pf "localauth:$npass\n"; 4552: } 4553: } elsif ($umode eq 'unix') { 4554: # 4555: # Don't allow the creation of privileged accounts!!! that would 4556: # be real bad!!! 4557: # 4558: my $uid = getpwnam($uname); 4559: if((defined $uid) && ($uid == 0)) { 4560: &logthis(">>>Attempted add of privileged account blocked<<<"); 4561: return "no_priv_account_error\n"; 4562: } 4563: 4564: # 4565: my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd"; 4566: 4567: &Debug("Executing external: ".$execpath); 4568: &Debug("user = ".$uname.", Password =". $npass); 4569: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log"); 4570: print $se "$uname\n"; 4571: print $se "$npass\n"; 4572: print $se "$npass\n"; 4573: 4574: my $useraddok = $?; 4575: if($useraddok > 0) { 4576: my $lcstring = lcuseraddstrerror($useraddok); 4577: &logthis("Failed lcuseradd: $lcstring"); 4578: return "error: lcuseradd failed: $lcstring\n"; 4579: } 4580: my $pf = IO::File->new(">$passfilename"); 4581: print $pf "unix:\n"; 4582: 4583: } elsif ($umode eq 'none') { 4584: { 4585: my $pf = IO::File->new(">$passfilename"); 4586: print $pf "none:\n"; 4587: } 4588: } else { 4589: $result="auth_mode_error\n"; 4590: } 4591: return $result; 4592: } 4593: 4594: sub sethost { 4595: my ($remotereq) = @_; 4596: Debug("sethost got $remotereq"); 4597: my (undef,$hostid)=split(/:/,$remotereq); 4598: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; } 4599: Debug("sethost attempting to set host $hostid"); 4600: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) { 4601: $currenthostid=$hostid; 4602: $currentdomainid=$hostdom{$hostid}; 4603: &logthis("Setting hostid to $hostid, and domain to $currentdomainid"); 4604: } else { 4605: &logthis("Requested host id $hostid not an alias of ". 4606: $perlvar{'lonHostID'}." refusing connection"); 4607: return 'unable_to_set'; 4608: } 4609: return 'ok'; 4610: } 4611: 4612: sub version { 4613: my ($userinput)=@_; 4614: $remoteVERSION=(split(/:/,$userinput))[1]; 4615: return "version:$VERSION"; 4616: } 4617: ############## >>>>>>>>>>>>>>>>>>>>>>>>>> FUTUREWORK <<<<<<<<<<<<<<<<<<<<<<<<<<<< 4618: #There is a copy of this in lonnet.pm 4619: # Can we hoist these lil' things out into common places? 4620: # 4621: sub userload { 4622: my $numusers=0; 4623: { 4624: opendir(LONIDS,$perlvar{'lonIDsDir'}); 4625: my $filename; 4626: my $curtime=time; 4627: while ($filename=readdir(LONIDS)) { 4628: if ($filename eq '.' || $filename eq '..') {next;} 4629: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9]; 4630: if ($curtime-$mtime < 1800) { $numusers++; } 4631: } 4632: closedir(LONIDS); 4633: } 4634: my $userloadpercent=0; 4635: my $maxuserload=$perlvar{'lonUserLoadLim'}; 4636: if ($maxuserload) { 4637: $userloadpercent=100*$numusers/$maxuserload; 4638: } 4639: $userloadpercent=sprintf("%.2f",$userloadpercent); 4640: return $userloadpercent; 4641: } 4642: 4643: # ----------------------------------- POD (plain old documentation, CPAN style) 4644: 4645: =head1 NAME 4646: 4647: lond - "LON Daemon" Server (port "LOND" 5663) 4648: 4649: =head1 SYNOPSIS 4650: 4651: Usage: B<lond> 4652: 4653: Should only be run as user=www. This is a command-line script which 4654: is invoked by B<loncron>. There is no expectation that a typical user 4655: will manually start B<lond> from the command-line. (In other words, 4656: DO NOT START B<lond> YOURSELF.) 4657: 4658: =head1 DESCRIPTION 4659: 4660: There are two characteristics associated with the running of B<lond>, 4661: PROCESS MANAGEMENT (starting, stopping, handling child processes) 4662: and SERVER-SIDE ACTIVITIES (password authentication, user creation, 4663: subscriptions, etc). These are described in two large 4664: sections below. 4665: 4666: B<PROCESS MANAGEMENT> 4667: 4668: Preforker - server who forks first. Runs as a daemon. HUPs. 4669: Uses IDEA encryption 4670: 4671: B<lond> forks off children processes that correspond to the other servers 4672: in the network. Management of these processes can be done at the 4673: parent process level or the child process level. 4674: 4675: B<logs/lond.log> is the location of log messages. 4676: 4677: The process management is now explained in terms of linux shell commands, 4678: subroutines internal to this code, and signal assignments: 4679: 4680: =over 4 4681: 4682: =item * 4683: 4684: PID is stored in B<logs/lond.pid> 4685: 4686: This is the process id number of the parent B<lond> process. 4687: 4688: =item * 4689: 4690: SIGTERM and SIGINT 4691: 4692: Parent signal assignment: 4693: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN; 4694: 4695: Child signal assignment: 4696: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also) 4697: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber 4698: to restart a new child.) 4699: 4700: Command-line invocations: 4701: B<kill> B<-s> SIGTERM I<PID> 4702: B<kill> B<-s> SIGINT I<PID> 4703: 4704: Subroutine B<HUNTSMAN>: 4705: This is only invoked for the B<lond> parent I<PID>. 4706: This kills all the children, and then the parent. 4707: The B<lonc.pid> file is cleared. 4708: 4709: =item * 4710: 4711: SIGHUP 4712: 4713: Current bug: 4714: This signal can only be processed the first time 4715: on the parent process. Subsequent SIGHUP signals 4716: have no effect. 4717: 4718: Parent signal assignment: 4719: $SIG{HUP} = \&HUPSMAN; 4720: 4721: Child signal assignment: 4722: none (nothing happens) 4723: 4724: Command-line invocations: 4725: B<kill> B<-s> SIGHUP I<PID> 4726: 4727: Subroutine B<HUPSMAN>: 4728: This is only invoked for the B<lond> parent I<PID>, 4729: This kills all the children, and then the parent. 4730: The B<lond.pid> file is cleared. 4731: 4732: =item * 4733: 4734: SIGUSR1 4735: 4736: Parent signal assignment: 4737: $SIG{USR1} = \&USRMAN; 4738: 4739: Child signal assignment: 4740: $SIG{USR1}= \&logstatus; 4741: 4742: Command-line invocations: 4743: B<kill> B<-s> SIGUSR1 I<PID> 4744: 4745: Subroutine B<USRMAN>: 4746: When invoked for the B<lond> parent I<PID>, 4747: SIGUSR1 is sent to all the children, and the status of 4748: each connection is logged. 4749: 4750: =item * 4751: 4752: SIGUSR2 4753: 4754: Parent Signal assignment: 4755: $SIG{USR2} = \&UpdateHosts 4756: 4757: Child signal assignment: 4758: NONE 4759: 4760: 4761: =item * 4762: 4763: SIGCHLD 4764: 4765: Parent signal assignment: 4766: $SIG{CHLD} = \&REAPER; 4767: 4768: Child signal assignment: 4769: none 4770: 4771: Command-line invocations: 4772: B<kill> B<-s> SIGCHLD I<PID> 4773: 4774: Subroutine B<REAPER>: 4775: This is only invoked for the B<lond> parent I<PID>. 4776: Information pertaining to the child is removed. 4777: The socket port is cleaned up. 4778: 4779: =back 4780: 4781: B<SERVER-SIDE ACTIVITIES> 4782: 4783: Server-side information can be accepted in an encrypted or non-encrypted 4784: method. 4785: 4786: =over 4 4787: 4788: =item ping 4789: 4790: Query a client in the hosts.tab table; "Are you there?" 4791: 4792: =item pong 4793: 4794: Respond to a ping query. 4795: 4796: =item ekey 4797: 4798: Read in encrypted key, make cipher. Respond with a buildkey. 4799: 4800: =item load 4801: 4802: Respond with CPU load based on a computation upon /proc/loadavg. 4803: 4804: =item currentauth 4805: 4806: Reply with current authentication information (only over an 4807: encrypted channel). 4808: 4809: =item auth 4810: 4811: Only over an encrypted channel, reply as to whether a user's 4812: authentication information can be validated. 4813: 4814: =item passwd 4815: 4816: Allow for a password to be set. 4817: 4818: =item makeuser 4819: 4820: Make a user. 4821: 4822: =item passwd 4823: 4824: Allow for authentication mechanism and password to be changed. 4825: 4826: =item home 4827: 4828: Respond to a question "are you the home for a given user?" 4829: 4830: =item update 4831: 4832: Update contents of a subscribed resource. 4833: 4834: =item unsubscribe 4835: 4836: The server is unsubscribing from a resource. 4837: 4838: =item subscribe 4839: 4840: The server is subscribing to a resource. 4841: 4842: =item log 4843: 4844: Place in B<logs/lond.log> 4845: 4846: =item put 4847: 4848: stores hash in namespace 4849: 4850: =item rolesput 4851: 4852: put a role into a user's environment 4853: 4854: =item get 4855: 4856: returns hash with keys from array 4857: reference filled in from namespace 4858: 4859: =item eget 4860: 4861: returns hash with keys from array 4862: reference filled in from namesp (encrypts the return communication) 4863: 4864: =item rolesget 4865: 4866: get a role from a user's environment 4867: 4868: =item del 4869: 4870: deletes keys out of array from namespace 4871: 4872: =item keys 4873: 4874: returns namespace keys 4875: 4876: =item dump 4877: 4878: dumps the complete (or key matching regexp) namespace into a hash 4879: 4880: =item store 4881: 4882: stores hash permanently 4883: for this url; hashref needs to be given and should be a \%hashname; the 4884: remaining args aren't required and if they aren't passed or are '' they will 4885: be derived from the ENV 4886: 4887: =item restore 4888: 4889: returns a hash for a given url 4890: 4891: =item querysend 4892: 4893: Tells client about the lonsql process that has been launched in response 4894: to a sent query. 4895: 4896: =item queryreply 4897: 4898: Accept information from lonsql and make appropriate storage in temporary 4899: file space. 4900: 4901: =item idput 4902: 4903: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers 4904: for each student, defined perhaps by the institutional Registrar.) 4905: 4906: =item idget 4907: 4908: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers 4909: for each student, defined perhaps by the institutional Registrar.) 4910: 4911: =item tmpput 4912: 4913: Accept and store information in temporary space. 4914: 4915: =item tmpget 4916: 4917: Send along temporarily stored information. 4918: 4919: =item ls 4920: 4921: List part of a user's directory. 4922: 4923: =item pushtable 4924: 4925: Pushes a file in /home/httpd/lonTab directory. Currently limited to: 4926: hosts.tab and domain.tab. The old file is copied to *.tab.backup but 4927: must be restored manually in case of a problem with the new table file. 4928: pushtable requires that the request be encrypted and validated via 4929: ValidateManager. The form of the command is: 4930: enc:pushtable tablename <tablecontents> \n 4931: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 4932: cleartext newline. 4933: 4934: =item Hanging up (exit or init) 4935: 4936: What to do when a client tells the server that they (the client) 4937: are leaving the network. 4938: 4939: =item unknown command 4940: 4941: If B<lond> is sent an unknown command (not in the list above), 4942: it replys to the client "unknown_cmd". 4943: 4944: 4945: =item UNKNOWN CLIENT 4946: 4947: If the anti-spoofing algorithm cannot verify the client, 4948: the client is rejected (with a "refused" message sent 4949: to the client, and the connection is closed. 4950: 4951: =back 4952: 4953: =head1 PREREQUISITES 4954: 4955: IO::Socket 4956: IO::File 4957: Apache::File 4958: Symbol 4959: POSIX 4960: Crypt::IDEA 4961: LWP::UserAgent() 4962: GDBM_File 4963: Authen::Krb4 4964: Authen::Krb5 4965: 4966: =head1 COREQUISITES 4967: 4968: =head1 OSNAMES 4969: 4970: linux 4971: 4972: =head1 SCRIPT CATEGORIES 4973: 4974: Server/Process 4975: 4976: =cut