loncom/lond - view

File: [LON-CAPA] / loncom / lond
Revision 1.360: download - view: text, annotated - select for diffs
Sun Jan 28 19:23:25 2007 UTC (17 years, 9 months ago) by raeburn
Branches: MAIN
CVS tags: HEAD

Use get_domain_handler().

1: #!/usr/bin/perl 2: # The LearningOnline Network 3: # lond "LON Daemon" Server (port "LOND" 5663) 4: # 5: # $Id: lond,v 1.360 2007/01/28 19:23:25 raeburn 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; 35: use LONCAPA::Configuration; 36: 37: use IO::Socket; 38: use IO::File; 39: #use Apache::File; 40: use POSIX; 41: use Crypt::IDEA; 42: use LWP::UserAgent(); 43: use Digest::MD5 qw(md5_hex); 44: use GDBM_File; 45: use Authen::Krb4; 46: use Authen::Krb5; 47: use localauth; 48: use localenroll; 49: use localstudentphoto; 50: use File::Copy; 51: use File::Find; 52: use LONCAPA::ConfigFileEdit; 53: use LONCAPA::lonlocal; 54: use LONCAPA::lonssl; 55: use Fcntl qw(:flock); 56: 57: my $DEBUG = 0; # Non zero to enable debug log entries. 58: 59: my $status=''; 60: my $lastlog=''; 61: 62: my $VERSION='$Revision: 1.360 $'; #' stupid emacs 63: my $remoteVERSION; 64: my $currenthostid="default"; 65: my $currentdomainid; 66: 67: my $client; 68: my $clientip; # IP address of client. 69: my $clientname; # LonCAPA name of client. 70: 71: my $server; 72: my $thisserver; # DNS of us. 73: 74: my $keymode; 75: 76: my $cipher; # Cipher key negotiated with client 77: my $tmpsnum = 0; # Id of tmpputs. 78: 79: # 80: # Connection type is: 81: # client - All client actions are allowed 82: # manager - only management functions allowed. 83: # both - Both management and client actions are allowed 84: # 85: 86: my $ConnectionType; 87: 88: my %hostid; # ID's for hosts in cluster by ip. 89: my %hostdom; # LonCAPA domain for hosts in cluster. 90: my %hostname; # DNSname -> ID's mapping. 91: my %hostip; # IPs for hosts in cluster. 92: my %hostdns; # ID's of hosts looked up by DNS name. 93: 94: my %managers; # Ip -> manager names 95: 96: my %perlvar; # Will have the apache conf defined perl vars. 97: 98: # 99: # The hash below is used for command dispatching, and is therefore keyed on the request keyword. 100: # Each element of the hash contains a reference to an array that contains: 101: # A reference to a sub that executes the request corresponding to the keyword. 102: # A flag that is true if the request must be encoded to be acceptable. 103: # A mask with bits as follows: 104: # CLIENT_OK - Set when the function is allowed by ordinary clients 105: # MANAGER_OK - Set when the function is allowed to manager clients. 106: # 107: my $CLIENT_OK = 1; 108: my $MANAGER_OK = 2; 109: my %Dispatcher; 110: 111: 112: # 113: # The array below are password error strings." 114: # 115: my $lastpwderror = 13; # Largest error number from lcpasswd. 116: my @passwderrors = ("ok", 117: "pwchange_failure - lcpasswd must be run as user 'www'", 118: "pwchange_failure - lcpasswd got incorrect number of arguments", 119: "pwchange_failure - lcpasswd did not get the right nubmer of input text lines", 120: "pwchange_failure - lcpasswd too many simultaneous pwd changes in progress", 121: "pwchange_failure - lcpasswd User does not exist.", 122: "pwchange_failure - lcpasswd Incorrect current passwd", 123: "pwchange_failure - lcpasswd Unable to su to root.", 124: "pwchange_failure - lcpasswd Cannot set new passwd.", 125: "pwchange_failure - lcpasswd Username has invalid characters", 126: "pwchange_failure - lcpasswd Invalid characters in password", 127: "pwchange_failure - lcpasswd User already exists", 128: "pwchange_failure - lcpasswd Something went wrong with user addition.", 129: "pwchange_failure - lcpasswd Password mismatch", 130: "pwchange_failure - lcpasswd Error filename is invalid"); 131: 132: 133: # The array below are lcuseradd error strings.: 134: 135: my $lastadderror = 13; 136: my @adderrors = ("ok", 137: "User ID mismatch, lcuseradd must run as user www", 138: "lcuseradd Incorrect number of command line parameters must be 3", 139: "lcuseradd Incorrect number of stdinput lines, must be 3", 140: "lcuseradd Too many other simultaneous pwd changes in progress", 141: "lcuseradd User does not exist", 142: "lcuseradd Unable to make www member of users's group", 143: "lcuseradd Unable to su to root", 144: "lcuseradd Unable to set password", 145: "lcuseradd Usrname has invalid characters", 146: "lcuseradd Password has an invalid character", 147: "lcuseradd User already exists", 148: "lcuseradd Could not add user.", 149: "lcuseradd Password mismatch"); 150: 151: 152: 153: # 154: # Statistics that are maintained and dislayed in the status line. 155: # 156: my $Transactions = 0; # Number of attempted transactions. 157: my $Failures = 0; # Number of transcations failed. 158: 159: # ResetStatistics: 160: # Resets the statistics counters: 161: # 162: sub ResetStatistics { 163: $Transactions = 0; 164: $Failures = 0; 165: } 166: 167: #------------------------------------------------------------------------ 168: # 169: # LocalConnection 170: # Completes the formation of a locally authenticated connection. 171: # This function will ensure that the 'remote' client is really the 172: # local host. If not, the connection is closed, and the function fails. 173: # If so, initcmd is parsed for the name of a file containing the 174: # IDEA session key. The fie is opened, read, deleted and the session 175: # key returned to the caller. 176: # 177: # Parameters: 178: # $Socket - Socket open on client. 179: # $initcmd - The full text of the init command. 180: # 181: # Implicit inputs: 182: # $thisserver - Our DNS name. 183: # 184: # Returns: 185: # IDEA session key on success. 186: # undef on failure. 187: # 188: sub LocalConnection { 189: my ($Socket, $initcmd) = @_; 190: Debug("Attempting local connection: $initcmd client: $clientip me: $thisserver"); 191: if($clientip ne "127.0.0.1") { 192: &logthis(' LocalConnection rejecting non local: ' 193: ."$clientip ne $thisserver "); 194: close $Socket; 195: return undef; 196: } else { 197: chomp($initcmd); # Get rid of \n in filename. 198: my ($init, $type, $name) = split(/:/, $initcmd); 199: Debug(" Init command: $init $type $name "); 200: 201: # Require that $init = init, and $type = local: Otherwise 202: # the caller is insane: 203: 204: if(($init ne "init") && ($type ne "local")) { 205: &logthis(' LocalConnection: caller is insane! ' 206: ."init = $init, and type = $type "); 207: close($Socket);; 208: return undef; 209: 210: } 211: # Now get the key filename: 212: 213: my $IDEAKey = lonlocal::ReadKeyFile($name); 214: return $IDEAKey; 215: } 216: } 217: #------------------------------------------------------------------------------ 218: # 219: # SSLConnection 220: # Completes the formation of an ssh authenticated connection. The 221: # socket is promoted to an ssl socket. If this promotion and the associated 222: # certificate exchange are successful, the IDEA key is generated and sent 223: # to the remote peer via the SSL tunnel. The IDEA key is also returned to 224: # the caller after the SSL tunnel is torn down. 225: # 226: # Parameters: 227: # Name Type Purpose 228: # $Socket IO::Socket::INET Plaintext socket. 229: # 230: # Returns: 231: # IDEA key on success. 232: # undef on failure. 233: # 234: sub SSLConnection { 235: my $Socket = shift; 236: 237: Debug("SSLConnection: "); 238: my $KeyFile = lonssl::KeyFile(); 239: if(!$KeyFile) { 240: my $err = lonssl::LastError(); 241: &logthis(" CRITICAL" 242: ."Can't get key file $err "); 243: return undef; 244: } 245: my ($CACertificate, 246: $Certificate) = lonssl::CertificateFile(); 247: 248: 249: # If any of the key, certificate or certificate authority 250: # certificate filenames are not defined, this can't work. 251: 252: if((!$Certificate) || (!$CACertificate)) { 253: my $err = lonssl::LastError(); 254: &logthis(" CRITICAL" 255: ."Can't get certificates: $err "); 256: 257: return undef; 258: } 259: Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate"); 260: 261: # Indicate to our peer that we can procede with 262: # a transition to ssl authentication: 263: 264: print $Socket "ok:ssl\n"; 265: 266: Debug("Approving promotion -> ssl"); 267: # And do so: 268: 269: my $SSLSocket = lonssl::PromoteServerSocket($Socket, 270: $CACertificate, 271: $Certificate, 272: $KeyFile); 273: if(! ($SSLSocket) ) { # SSL socket promotion failed. 274: my $err = lonssl::LastError(); 275: &logthis(" CRITICAL " 276: ."SSL Socket promotion failed: $err "); 277: return undef; 278: } 279: Debug("SSL Promotion successful"); 280: 281: # 282: # The only thing we'll use the socket for is to send the IDEA key 283: # to the peer: 284: 285: my $Key = lonlocal::CreateCipherKey(); 286: print $SSLSocket "$Key\n"; 287: 288: lonssl::Close($SSLSocket); 289: 290: Debug("Key exchange complete: $Key"); 291: 292: return $Key; 293: } 294: # 295: # InsecureConnection: 296: # If insecure connections are allowd, 297: # exchange a challenge with the client to 'validate' the 298: # client (not really, but that's the protocol): 299: # We produce a challenge string that's sent to the client. 300: # The client must then echo the challenge verbatim to us. 301: # 302: # Parameter: 303: # Socket - Socket open on the client. 304: # Returns: 305: # 1 - success. 306: # 0 - failure (e.g.mismatch or insecure not allowed). 307: # 308: sub InsecureConnection { 309: my $Socket = shift; 310: 311: # Don't even start if insecure connections are not allowed. 312: 313: if(! $perlvar{londAllowInsecure}) { # Insecure connections not allowed. 314: return 0; 315: } 316: 317: # Fabricate a challenge string and send it.. 318: 319: my $challenge = "$$".time; # pid + time. 320: print $Socket "$challenge\n"; 321: &status("Waiting for challenge reply"); 322: 323: my $answer = <$Socket>; 324: $answer =~s/\W//g; 325: if($challenge eq $answer) { 326: return 1; 327: } else { 328: logthis("WARNING client did not respond to challenge"); 329: &status("No challenge reqply"); 330: return 0; 331: } 332: 333: 334: } 335: # 336: # Safely execute a command (as long as it's not a shel command and doesn 337: # not require/rely on shell escapes. The function operates by doing a 338: # a pipe based fork and capturing stdout and stderr from the pipe. 339: # 340: # Formal Parameters: 341: # $line - A line of text to be executed as a command. 342: # Returns: 343: # The output from that command. If the output is multiline the caller 344: # must know how to split up the output. 345: # 346: # 347: sub execute_command { 348: my ($line) = @_; 349: my @words = split(/\s/, $line); # Bust the command up into words. 350: my $output = ""; 351: 352: my $pid = open(CHILD, "-|"); 353: 354: if($pid) { # Parent process 355: Debug("In parent process for execute_command"); 356: my @data = <CHILD>; # Read the child's outupt... 357: close CHILD; 358: foreach my $output_line (@data) { 359: Debug("Adding $output_line"); 360: $output .= $output_line; # Presumably has a \n on it. 361: } 362: 363: } else { # Child process 364: close (STDERR); 365: open (STDERR, ">&STDOUT");# Combine stderr, and stdout... 366: exec(@words); # won't return. 367: } 368: return $output; 369: } 370: 371: 372: # GetCertificate: Given a transaction that requires a certificate, 373: # this function will extract the certificate from the transaction 374: # request. Note that at this point, the only concept of a certificate 375: # is the hostname to which we are connected. 376: # 377: # Parameter: 378: # request - The request sent by our client (this parameterization may 379: # need to change when we really use a certificate granting 380: # authority. 381: # 382: sub GetCertificate { 383: my $request = shift; 384: 385: return $clientip; 386: } 387: 388: # 389: # Return true if client is a manager. 390: # 391: sub isManager { 392: return (($ConnectionType eq "manager") || ($ConnectionType eq "both")); 393: } 394: # 395: # Return tru if client can do client functions 396: # 397: sub isClient { 398: return (($ConnectionType eq "client") || ($ConnectionType eq "both")); 399: } 400: 401: 402: # 403: # ReadManagerTable: Reads in the current manager table. For now this is 404: # done on each manager authentication because: 405: # - These authentications are not frequent 406: # - This allows dynamic changes to the manager table 407: # without the need to signal to the lond. 408: # 409: sub ReadManagerTable { 410: 411: # Clean out the old table first.. 412: 413: foreach my $key (keys %managers) { 414: delete $managers{$key}; 415: } 416: 417: my $tablename = $perlvar{'lonTabDir'}."/managers.tab"; 418: if (!open (MANAGERS, $tablename)) { 419: logthis('No manager table. Nobody can manage!!'); 420: return; 421: } 422: while(my $host = <MANAGERS>) { 423: chomp($host); 424: if ($host =~ "^#") { # Comment line. 425: next; 426: } 427: if (!defined $hostip{$host}) { # This is a non cluster member 428: # The entry is of the form: 429: # cluname:hostname 430: # cluname - A 'cluster hostname' is needed in order to negotiate 431: # the host key. 432: # hostname- The dns name of the host. 433: # 434: my($cluname, $dnsname) = split(/:/, $host); 435: 436: my $ip = gethostbyname($dnsname); 437: if(defined($ip)) { # bad names don't deserve entry. 438: my $hostip = inet_ntoa($ip); 439: $managers{$hostip} = $cluname; 440: logthis(' registering manager '. 441: "$dnsname as $cluname with $hostip \n"); 442: } 443: } else { 444: logthis(' existing host'." $host\n"); 445: $managers{$hostip{$host}} = $host; # Use info from cluster tab if clumemeber 446: } 447: } 448: } 449: 450: # 451: # ValidManager: Determines if a given certificate represents a valid manager. 452: # in this primitive implementation, the 'certificate' is 453: # just the connecting loncapa client name. This is checked 454: # against a valid client list in the configuration. 455: # 456: # 457: sub ValidManager { 458: my $certificate = shift; 459: 460: return isManager; 461: } 462: # 463: # CopyFile: Called as part of the process of installing a 464: # new configuration file. This function copies an existing 465: # file to a backup file. 466: # Parameters: 467: # oldfile - Name of the file to backup. 468: # newfile - Name of the backup file. 469: # Return: 470: # 0 - Failure (errno has failure reason). 471: # 1 - Success. 472: # 473: sub CopyFile { 474: 475: my ($oldfile, $newfile) = @_; 476: 477: if (! copy($oldfile,$newfile)) { 478: return 0; 479: } 480: chmod(0660, $newfile); 481: return 1; 482: } 483: # 484: # Host files are passed out with externally visible host IPs. 485: # If, for example, we are behind a fire-wall or NAT host, our 486: # internally visible IP may be different than the externally 487: # visible IP. Therefore, we always adjust the contents of the 488: # host file so that the entry for ME is the IP that we believe 489: # we have. At present, this is defined as the entry that 490: # DNS has for us. If by some chance we are not able to get a 491: # DNS translation for us, then we assume that the host.tab file 492: # is correct. 493: # BUGBUGBUG - in the future, we really should see if we can 494: # easily query the interface(s) instead. 495: # Parameter(s): 496: # contents - The contents of the host.tab to check. 497: # Returns: 498: # newcontents - The adjusted contents. 499: # 500: # 501: sub AdjustHostContents { 502: my $contents = shift; 503: my $adjusted; 504: my $me = $perlvar{'lonHostID'}; 505: 506: foreach my $line (split(/\n/,$contents)) { 507: if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) { 508: chomp($line); 509: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line); 510: if ($id eq $me) { 511: my $ip = gethostbyname($name); 512: my $ipnew = inet_ntoa($ip); 513: $ip = $ipnew; 514: # Reconstruct the host line and append to adjusted: 515: 516: my $newline = "$id:$domain:$role:$name:$ip"; 517: if($maxcon ne "") { # Not all hosts have loncnew tuning params 518: $newline .= ":$maxcon:$idleto:$mincon"; 519: } 520: $adjusted .= $newline."\n"; 521: 522: } else { # Not me, pass unmodified. 523: $adjusted .= $line."\n"; 524: } 525: } else { # Blank or comment never re-written. 526: $adjusted .= $line."\n"; # Pass blanks and comments as is. 527: } 528: } 529: return $adjusted; 530: } 531: # 532: # InstallFile: Called to install an administrative file: 533: # - The file is created with <name>.tmp 534: # - The <name>.tmp file is then mv'd to <name> 535: # This lugubrious procedure is done to ensure that we are never without 536: # a valid, even if dated, version of the file regardless of who crashes 537: # and when the crash occurs. 538: # 539: # Parameters: 540: # Name of the file 541: # File Contents. 542: # Return: 543: # nonzero - success. 544: # 0 - failure and $! has an errno. 545: # 546: sub InstallFile { 547: 548: my ($Filename, $Contents) = @_; 549: my $TempFile = $Filename.".tmp"; 550: 551: # Open the file for write: 552: 553: my $fh = IO::File->new("> $TempFile"); # Write to temp. 554: if(!(defined $fh)) { 555: &logthis(' Unable to create '.$TempFile.""); 556: return 0; 557: } 558: # write the contents of the file: 559: 560: print $fh ($Contents); 561: $fh->close; # In case we ever have a filesystem w. locking 562: 563: chmod(0660, $TempFile); 564: 565: # Now we can move install the file in position. 566: 567: move($TempFile, $Filename); 568: 569: return 1; 570: } 571: 572: 573: # 574: # ConfigFileFromSelector: converts a configuration file selector 575: # (one of host or domain at this point) into a 576: # configuration file pathname. 577: # 578: # Parameters: 579: # selector - Configuration file selector. 580: # Returns: 581: # Full path to the file or undef if the selector is invalid. 582: # 583: sub ConfigFileFromSelector { 584: my $selector = shift; 585: my $tablefile; 586: 587: my $tabledir = $perlvar{'lonTabDir'}.'/'; 588: if ($selector eq "hosts") { 589: $tablefile = $tabledir."hosts.tab"; 590: } elsif ($selector eq "domain") { 591: $tablefile = $tabledir."domain.tab"; 592: } else { 593: return undef; 594: } 595: return $tablefile; 596: 597: } 598: # 599: # PushFile: Called to do an administrative push of a file. 600: # - Ensure the file being pushed is one we support. 601: # - Backup the old file to <filename.saved> 602: # - Separate the contents of the new file out from the 603: # rest of the request. 604: # - Write the new file. 605: # Parameter: 606: # Request - The entire user request. This consists of a : separated 607: # string pushfile:tablename:contents. 608: # NOTE: The contents may have :'s in it as well making things a bit 609: # more interesting... but not much. 610: # Returns: 611: # String to send to client ("ok" or "refused" if bad file). 612: # 613: sub PushFile { 614: my $request = shift; 615: my ($command, $filename, $contents) = split(":", $request, 3); 616: 617: # At this point in time, pushes for only the following tables are 618: # supported: 619: # hosts.tab ($filename eq host). 620: # domain.tab ($filename eq domain). 621: # Construct the destination filename or reject the request. 622: # 623: # lonManage is supposed to ensure this, however this session could be 624: # part of some elaborate spoof that managed somehow to authenticate. 625: # 626: 627: 628: my $tablefile = ConfigFileFromSelector($filename); 629: if(! (defined $tablefile)) { 630: return "refused"; 631: } 632: # 633: # >copy< the old table to the backup table 634: # don't rename in case system crashes/reboots etc. in the time 635: # window between a rename and write. 636: # 637: my $backupfile = $tablefile; 638: $backupfile =~ s/\.tab$/.old/; 639: if(!CopyFile($tablefile, $backupfile)) { 640: &logthis(' CopyFile from '.$tablefile." to ".$backupfile." failed "); 641: return "error:$!"; 642: } 643: &logthis(' Pushfile: backed up ' 644: .$tablefile." to $backupfile"); 645: 646: # If the file being pushed is the host file, we adjust the entry for ourself so that the 647: # IP will be our current IP as looked up in dns. Note this is only 99% good as it's possible 648: # to conceive of conditions where we don't have a DNS entry locally. This is possible in a 649: # network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now) 650: # that possibilty. 651: 652: if($filename eq "host") { 653: $contents = AdjustHostContents($contents); 654: } 655: 656: # Install the new file: 657: 658: if(!InstallFile($tablefile, $contents)) { 659: &logthis(' Pushfile: unable to install ' 660: .$tablefile." $! "); 661: return "error:$!"; 662: } else { 663: &logthis(' Installed new '.$tablefile 664: .""); 665: 666: } 667: 668: 669: # Indicate success: 670: 671: return "ok"; 672: 673: } 674: 675: # 676: # Called to re-init either lonc or lond. 677: # 678: # Parameters: 679: # request - The full request by the client. This is of the form 680: # reinit:<process> 681: # where <process> is allowed to be either of 682: # lonc or lond 683: # 684: # Returns: 685: # The string to be sent back to the client either: 686: # ok - Everything worked just fine. 687: # error:why - There was a failure and why describes the reason. 688: # 689: # 690: sub ReinitProcess { 691: my $request = shift; 692: 693: 694: # separate the request (reinit) from the process identifier and 695: # validate it producing the name of the .pid file for the process. 696: # 697: # 698: my ($junk, $process) = split(":", $request); 699: my $processpidfile = $perlvar{'lonDaemons'}.'/logs/'; 700: if($process eq 'lonc') { 701: $processpidfile = $processpidfile."lonc.pid"; 702: if (!open(PIDFILE, "< $processpidfile")) { 703: return "error:Open failed for $processpidfile"; 704: } 705: my $loncpid = <PIDFILE>; 706: close(PIDFILE); 707: logthis(' Reinitializing lonc pid='.$loncpid 708: .""); 709: kill("USR2", $loncpid); 710: } elsif ($process eq 'lond') { 711: logthis(' Reinitializing self (lond) '); 712: &UpdateHosts; # Lond is us!! 713: } else { 714: &logthis('"); 716: return "error:Invalid process identifier $process"; 717: } 718: return 'ok'; 719: } 720: # Validate a line in a configuration file edit script: 721: # Validation includes: 722: # - Ensuring the command is valid. 723: # - Ensuring the command has sufficient parameters 724: # Parameters: 725: # scriptline - A line to validate (\n has been stripped for what it's worth). 726: # 727: # Return: 728: # 0 - Invalid scriptline. 729: # 1 - Valid scriptline 730: # NOTE: 731: # Only the command syntax is checked, not the executability of the 732: # command. 733: # 734: sub isValidEditCommand { 735: my $scriptline = shift; 736: 737: # Line elements are pipe separated: 738: 739: my ($command, $key, $newline) = split(/\|/, $scriptline); 740: &logthis(' isValideditCommand checking: '. 741: "Command = '$command', Key = '$key', Newline = '$newline' \n"); 742: 743: if ($command eq "delete") { 744: # 745: # key with no newline. 746: # 747: if( ($key eq "") || ($newline ne "")) { 748: return 0; # Must have key but no newline. 749: } else { 750: return 1; # Valid syntax. 751: } 752: } elsif ($command eq "replace") { 753: # 754: # key and newline: 755: # 756: if (($key eq "") || ($newline eq "")) { 757: return 0; 758: } else { 759: return 1; 760: } 761: } elsif ($command eq "append") { 762: if (($key ne "") && ($newline eq "")) { 763: return 1; 764: } else { 765: return 0; 766: } 767: } else { 768: return 0; # Invalid command. 769: } 770: return 0; # Should not get here!!! 771: } 772: # 773: # ApplyEdit - Applies an edit command to a line in a configuration 774: # file. It is the caller's responsiblity to validate the 775: # edit line. 776: # Parameters: 777: # $directive - A single edit directive to apply. 778: # Edit directives are of the form: 779: # append|newline - Appends a new line to the file. 780: # replace|key|newline - Replaces the line with key value 'key' 781: # delete|key - Deletes the line with key value 'key'. 782: # $editor - A config file editor object that contains the 783: # file being edited. 784: # 785: sub ApplyEdit { 786: 787: my ($directive, $editor) = @_; 788: 789: # Break the directive down into its command and its parameters 790: # (at most two at this point. The meaning of the parameters, if in fact 791: # they exist depends on the command). 792: 793: my ($command, $p1, $p2) = split(/\|/, $directive); 794: 795: if($command eq "append") { 796: $editor->Append($p1); # p1 - key p2 null. 797: } elsif ($command eq "replace") { 798: $editor->ReplaceLine($p1, $p2); # p1 - key p2 = newline. 799: } elsif ($command eq "delete") { 800: $editor->DeleteLine($p1); # p1 - key p2 null. 801: } else { # Should not get here!!! 802: die "Invalid command given to ApplyEdit $command" 803: } 804: } 805: # 806: # AdjustOurHost: 807: # Adjusts a host file stored in a configuration file editor object 808: # for the true IP address of this host. This is necessary for hosts 809: # that live behind a firewall. 810: # Those hosts have a publicly distributed IP of the firewall, but 811: # internally must use their actual IP. We assume that a given 812: # host only has a single IP interface for now. 813: # Formal Parameters: 814: # editor - The configuration file editor to adjust. This 815: # editor is assumed to contain a hosts.tab file. 816: # Strategy: 817: # - Figure out our hostname. 818: # - Lookup the entry for this host. 819: # - Modify the line to contain our IP 820: # - Do a replace for this host. 821: sub AdjustOurHost { 822: my $editor = shift; 823: 824: # figure out who I am. 825: 826: my $myHostName = $perlvar{'lonHostID'}; # LonCAPA hostname. 827: 828: # Get my host file entry. 829: 830: my $ConfigLine = $editor->Find($myHostName); 831: if(! (defined $ConfigLine)) { 832: die "AdjustOurHost - no entry for me in hosts file $myHostName"; 833: } 834: # figure out my IP: 835: # Use the config line to get my hostname. 836: # Use gethostbyname to translate that into an IP address. 837: # 838: my ($id,$domain,$role,$name,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine); 839: # 840: # Reassemble the config line from the elements in the list. 841: # Note that if the loncnew items were not present before, they will 842: # be now even if they would be empty 843: # 844: my $newConfigLine = $id; 845: foreach my $item ($domain, $role, $name, $maxcon, $idleto, $mincon) { 846: $newConfigLine .= ":".$item; 847: } 848: # Replace the line: 849: 850: $editor->ReplaceLine($id, $newConfigLine); 851: 852: } 853: # 854: # ReplaceConfigFile: 855: # Replaces a configuration file with the contents of a 856: # configuration file editor object. 857: # This is done by: 858: # - Copying the target file to <filename>.old 859: # - Writing the new file to <filename>.tmp 860: # - Moving <filename.tmp> -> <filename> 861: # This laborious process ensures that the system is never without 862: # a configuration file that's at least valid (even if the contents 863: # may be dated). 864: # Parameters: 865: # filename - Name of the file to modify... this is a full path. 866: # editor - Editor containing the file. 867: # 868: sub ReplaceConfigFile { 869: 870: my ($filename, $editor) = @_; 871: 872: CopyFile ($filename, $filename.".old"); 873: 874: my $contents = $editor->Get(); # Get the contents of the file. 875: 876: InstallFile($filename, $contents); 877: } 878: # 879: # 880: # Called to edit a configuration table file 881: # Parameters: 882: # request - The entire command/request sent by lonc or lonManage 883: # Return: 884: # The reply to send to the client. 885: # 886: sub EditFile { 887: my $request = shift; 888: 889: # Split the command into it's pieces: edit:filetype:script 890: 891: my ($cmd, $filetype, $script) = split(/:/, $request,3); # : in script 892: 893: # Check the pre-coditions for success: 894: 895: if($cmd != "edit") { # Something is amiss afoot alack. 896: return "error:edit request detected, but request != 'edit'\n"; 897: } 898: if( ($filetype ne "hosts") && 899: ($filetype ne "domain")) { 900: return "error:edit requested with invalid file specifier: $filetype \n"; 901: } 902: 903: # Split the edit script and check it's validity. 904: 905: my @scriptlines = split(/\n/, $script); # one line per element. 906: my $linecount = scalar(@scriptlines); 907: for(my $i = 0; $i < $linecount; $i++) { 908: chomp($scriptlines[$i]); 909: if(!isValidEditCommand($scriptlines[$i])) { 910: return "error:edit with bad script line: '$scriptlines[$i]' \n"; 911: } 912: } 913: 914: # Execute the edit operation. 915: # - Create a config file editor for the appropriate file and 916: # - execute each command in the script: 917: # 918: my $configfile = ConfigFileFromSelector($filetype); 919: if (!(defined $configfile)) { 920: return "refused\n"; 921: } 922: my $editor = ConfigFileEdit->new($configfile); 923: 924: for (my $i = 0; $i < $linecount; $i++) { 925: ApplyEdit($scriptlines[$i], $editor); 926: } 927: # If the file is the host file, ensure that our host is 928: # adjusted to have our ip: 929: # 930: if($filetype eq "host") { 931: AdjustOurHost($editor); 932: } 933: # Finally replace the current file with our file. 934: # 935: ReplaceConfigFile($configfile, $editor); 936: 937: return "ok\n"; 938: } 939: 940: # read_profile 941: # 942: # Returns a set of specific entries from a user's profile file. 943: # this is a utility function that is used by both get_profile_entry and 944: # get_profile_entry_encrypted. 945: # 946: # Parameters: 947: # udom - Domain in which the user exists. 948: # uname - User's account name (loncapa account) 949: # namespace - The profile namespace to open. 950: # what - A set of & separated queries. 951: # Returns: 952: # If all ok: - The string that needs to be shipped back to the user. 953: # If failure - A string that starts with error: followed by the failure 954: # reason.. note that this probabyl gets shipped back to the 955: # user as well. 956: # 957: sub read_profile { 958: my ($udom, $uname, $namespace, $what) = @_; 959: 960: my $hashref = &tie_user_hash($udom, $uname, $namespace, 961: &GDBM_READER()); 962: if ($hashref) { 963: my @queries=split(/\&/,$what); 964: my $qresult=''; 965: 966: for (my $i=0;$i<=$#queries;$i++) { 967: $qresult.="$hashref->{$queries[$i]}&"; # Presumably failure gives empty string. 968: } 969: $qresult=~s/\&$//; # Remove trailing & from last lookup. 970: if (&untie_user_hash($hashref)) { 971: return $qresult; 972: } else { 973: return "error: ".($!+0)." untie (GDBM) Failed"; 974: } 975: } else { 976: if ($!+0 == 2) { 977: return "error:No such file or GDBM reported bad block error"; 978: } else { 979: return "error: ".($!+0)." tie (GDBM) Failed"; 980: } 981: } 982: 983: } 984: #--------------------- Request Handlers -------------------------------------------- 985: # 986: # By convention each request handler registers itself prior to the sub 987: # declaration: 988: # 989: 990: #++ 991: # 992: # Handles ping requests. 993: # Parameters: 994: # $cmd - the actual keyword that invoked us. 995: # $tail - the tail of the request that invoked us. 996: # $replyfd- File descriptor connected to the client 997: # Implicit Inputs: 998: # $currenthostid - Global variable that carries the name of the host we are 999: # known as. 1000: # Returns: 1001: # 1 - Ok to continue processing. 1002: # 0 - Program should exit. 1003: # Side effects: 1004: # Reply information is sent to the client. 1005: sub ping_handler { 1006: my ($cmd, $tail, $client) = @_; 1007: Debug("$cmd $tail $client .. $currenthostid:"); 1008: 1009: Reply( $client,"$currenthostid\n","$cmd:$tail"); 1010: 1011: return 1; 1012: } 1013: &register_handler("ping", \&ping_handler, 0, 1, 1); # Ping unencoded, client or manager. 1014: 1015: #++ 1016: # 1017: # Handles pong requests. Pong replies with our current host id, and 1018: # the results of a ping sent to us via our lonc. 1019: # 1020: # Parameters: 1021: # $cmd - the actual keyword that invoked us. 1022: # $tail - the tail of the request that invoked us. 1023: # $replyfd- File descriptor connected to the client 1024: # Implicit Inputs: 1025: # $currenthostid - Global variable that carries the name of the host we are 1026: # connected to. 1027: # Returns: 1028: # 1 - Ok to continue processing. 1029: # 0 - Program should exit. 1030: # Side effects: 1031: # Reply information is sent to the client. 1032: sub pong_handler { 1033: my ($cmd, $tail, $replyfd) = @_; 1034: 1035: my $reply=&reply("ping",$clientname); 1036: &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 1037: return 1; 1038: } 1039: &register_handler("pong", \&pong_handler, 0, 1, 1); # Pong unencoded, client or manager 1040: 1041: #++ 1042: # Called to establish an encrypted session key with the remote client. 1043: # Note that with secure lond, in most cases this function is never 1044: # invoked. Instead, the secure session key is established either 1045: # via a local file that's locked down tight and only lives for a short 1046: # time, or via an ssl tunnel...and is generated from a bunch-o-random 1047: # bits from /dev/urandom, rather than the predictable pattern used by 1048: # by this sub. This sub is only used in the old-style insecure 1049: # key negotiation. 1050: # Parameters: 1051: # $cmd - the actual keyword that invoked us. 1052: # $tail - the tail of the request that invoked us. 1053: # $replyfd- File descriptor connected to the client 1054: # Implicit Inputs: 1055: # $currenthostid - Global variable that carries the name of the host 1056: # known as. 1057: # $clientname - Global variable that carries the name of the hsot we're connected to. 1058: # Returns: 1059: # 1 - Ok to continue processing. 1060: # 0 - Program should exit. 1061: # Implicit Outputs: 1062: # Reply information is sent to the client. 1063: # $cipher is set with a reference to a new IDEA encryption object. 1064: # 1065: sub establish_key_handler { 1066: my ($cmd, $tail, $replyfd) = @_; 1067: 1068: my $buildkey=time.$$.int(rand 100000); 1069: $buildkey=~tr/1-6/A-F/; 1070: $buildkey=int(rand 100000).$buildkey.int(rand 100000); 1071: my $key=$currenthostid.$clientname; 1072: $key=~tr/a-z/A-Z/; 1073: $key=~tr/G-P/0-9/; 1074: $key=~tr/Q-Z/0-9/; 1075: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey; 1076: $key=substr($key,0,32); 1077: my $cipherkey=pack("H32",$key); 1078: $cipher=new IDEA $cipherkey; 1079: &Reply($replyfd, "$buildkey\n", "$cmd:$tail"); 1080: 1081: return 1; 1082: 1083: } 1084: &register_handler("ekey", \&establish_key_handler, 0, 1,1); 1085: 1086: # Handler for the load command. Returns the current system load average 1087: # to the requestor. 1088: # 1089: # Parameters: 1090: # $cmd - the actual keyword that invoked us. 1091: # $tail - the tail of the request that invoked us. 1092: # $replyfd- File descriptor connected to the client 1093: # Implicit Inputs: 1094: # $currenthostid - Global variable that carries the name of the host 1095: # known as. 1096: # $clientname - Global variable that carries the name of the hsot we're connected to. 1097: # Returns: 1098: # 1 - Ok to continue processing. 1099: # 0 - Program should exit. 1100: # Side effects: 1101: # Reply information is sent to the client. 1102: sub load_handler { 1103: my ($cmd, $tail, $replyfd) = @_; 1104: 1105: # Get the load average from /proc/loadavg and calculate it as a percentage of 1106: # the allowed load limit as set by the perl global variable lonLoadLim 1107: 1108: my $loadavg; 1109: my $loadfile=IO::File->new('/proc/loadavg'); 1110: 1111: $loadavg=<$loadfile>; 1112: $loadavg =~ s/\s.*//g; # Extract the first field only. 1113: 1114: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'}; 1115: 1116: &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail"); 1117: 1118: return 1; 1119: } 1120: &register_handler("load", \&load_handler, 0, 1, 0); 1121: 1122: # 1123: # Process the userload request. This sub returns to the client the current 1124: # user load average. It can be invoked either by clients or managers. 1125: # 1126: # Parameters: 1127: # $cmd - the actual keyword that invoked us. 1128: # $tail - the tail of the request that invoked us. 1129: # $replyfd- File descriptor connected to the client 1130: # Implicit Inputs: 1131: # $currenthostid - Global variable that carries the name of the host 1132: # known as. 1133: # $clientname - Global variable that carries the name of the hsot we're connected to. 1134: # Returns: 1135: # 1 - Ok to continue processing. 1136: # 0 - Program should exit 1137: # Implicit inputs: 1138: # whatever the userload() function requires. 1139: # Implicit outputs: 1140: # the reply is written to the client. 1141: # 1142: sub user_load_handler { 1143: my ($cmd, $tail, $replyfd) = @_; 1144: 1145: my $userloadpercent=&userload(); 1146: &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail"); 1147: 1148: return 1; 1149: } 1150: &register_handler("userload", \&user_load_handler, 0, 1, 0); 1151: 1152: # Process a request for the authorization type of a user: 1153: # (userauth). 1154: # 1155: # Parameters: 1156: # $cmd - the actual keyword that invoked us. 1157: # $tail - the tail of the request that invoked us. 1158: # $replyfd- File descriptor connected to the client 1159: # Returns: 1160: # 1 - Ok to continue processing. 1161: # 0 - Program should exit 1162: # Implicit outputs: 1163: # The user authorization type is written to the client. 1164: # 1165: sub user_authorization_type { 1166: my ($cmd, $tail, $replyfd) = @_; 1167: 1168: my $userinput = "$cmd:$tail"; 1169: 1170: # Pull the domain and username out of the command tail. 1171: # and call get_auth_type to determine the authentication type. 1172: 1173: my ($udom,$uname)=split(/:/,$tail); 1174: my $result = &get_auth_type($udom, $uname); 1175: if($result eq "nouser") { 1176: &Failure( $replyfd, "unknown_user\n", $userinput); 1177: } else { 1178: # 1179: # We only want to pass the second field from get_auth_type 1180: # for ^krb.. otherwise we'll be handing out the encrypted 1181: # password for internals e.g. 1182: # 1183: my ($type,$otherinfo) = split(/:/,$result); 1184: if($type =~ /^krb/) { 1185: $type = $result; 1186: } else { 1187: $type .= ':'; 1188: } 1189: &Reply( $replyfd, "$type\n", $userinput); 1190: } 1191: 1192: return 1; 1193: } 1194: &register_handler("currentauth", \&user_authorization_type, 1, 1, 0); 1195: 1196: # Process a request by a manager to push a hosts or domain table 1197: # to us. We pick apart the command and pass it on to the subs 1198: # that already exist to do this. 1199: # 1200: # Parameters: 1201: # $cmd - the actual keyword that invoked us. 1202: # $tail - the tail of the request that invoked us. 1203: # $client - File descriptor connected to the client 1204: # Returns: 1205: # 1 - Ok to continue processing. 1206: # 0 - Program should exit 1207: # Implicit Output: 1208: # a reply is written to the client. 1209: sub push_file_handler { 1210: my ($cmd, $tail, $client) = @_; 1211: 1212: my $userinput = "$cmd:$tail"; 1213: 1214: # At this time we only know that the IP of our partner is a valid manager 1215: # the code below is a hook to do further authentication (e.g. to resolve 1216: # spoofing). 1217: 1218: my $cert = &GetCertificate($userinput); 1219: if(&ValidManager($cert)) { 1220: 1221: # Now presumably we have the bona fides of both the peer host and the 1222: # process making the request. 1223: 1224: my $reply = &PushFile($userinput); 1225: &Reply($client, "$reply\n", $userinput); 1226: 1227: } else { 1228: &Failure( $client, "refused\n", $userinput); 1229: } 1230: return 1; 1231: } 1232: &register_handler("pushfile", \&push_file_handler, 1, 0, 1); 1233: 1234: # 1235: # du - list the disk usuage of a directory recursively. 1236: # 1237: # note: stolen code from the ls file handler 1238: # under construction by Rick Banghart 1239: # . 1240: # Parameters: 1241: # $cmd - The command that dispatched us (du). 1242: # $ududir - The directory path to list... I'm not sure what this 1243: # is relative as things like ls:. return e.g. 1244: # no_such_dir. 1245: # $client - Socket open on the client. 1246: # Returns: 1247: # 1 - indicating that the daemon should not disconnect. 1248: # Side Effects: 1249: # The reply is written to $client. 1250: # 1251: sub du_handler { 1252: my ($cmd, $ududir, $client) = @_; 1253: ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier. 1254: my $userinput = "$cmd:$ududir"; 1255: 1256: if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) { 1257: &Failure($client,"refused\n","$cmd:$ududir"); 1258: return 1; 1259: } 1260: # Since $ududir could have some nasties in it, 1261: # we will require that ududir is a valid 1262: # directory. Just in case someone tries to 1263: # slip us a line like .;(cd /home/httpd rm -rf*) 1264: # etc. 1265: # 1266: if (-d $ududir) { 1267: my $total_size=0; 1268: my $code=sub { 1269: if ($_=~/\.\d+\./) { return;} 1270: if ($_=~/\.meta$/) { return;} 1271: $total_size+=(stat($_))[7]; 1272: }; 1273: chdir($ududir); 1274: find($code,$ududir); 1275: $total_size=int($total_size/1024); 1276: &Reply($client,"$total_size\n","$cmd:$ududir"); 1277: } else { 1278: &Failure($client, "bad_directory:$ududir\n","$cmd:$ududir"); 1279: } 1280: return 1; 1281: } 1282: &register_handler("du", \&du_handler, 0, 1, 0); 1283: 1284: # 1285: # The ls_handler routine should be considered obosolete and is retained 1286: # for communication with legacy servers. Please see the ls2_handler. 1287: # 1288: # ls - list the contents of a directory. For each file in the 1289: # selected directory the filename followed by the full output of 1290: # the stat function is returned. The returned info for each 1291: # file are separated by ':'. The stat fields are separated by &'s. 1292: # Parameters: 1293: # $cmd - The command that dispatched us (ls). 1294: # $ulsdir - The directory path to list... I'm not sure what this 1295: # is relative as things like ls:. return e.g. 1296: # no_such_dir. 1297: # $client - Socket open on the client. 1298: # Returns: 1299: # 1 - indicating that the daemon should not disconnect. 1300: # Side Effects: 1301: # The reply is written to $client. 1302: # 1303: sub ls_handler { 1304: # obsoleted by ls2_handler 1305: my ($cmd, $ulsdir, $client) = @_; 1306: 1307: my $userinput = "$cmd:$ulsdir"; 1308: 1309: my $obs; 1310: my $rights; 1311: my $ulsout=''; 1312: my $ulsfn; 1313: if (-e $ulsdir) { 1314: if(-d $ulsdir) { 1315: if (opendir(LSDIR,$ulsdir)) { 1316: while ($ulsfn=readdir(LSDIR)) { 1317: undef($obs); 1318: undef($rights); 1319: my @ulsstats=stat($ulsdir.'/'.$ulsfn); 1320: #We do some obsolete checking here 1321: if(-e $ulsdir.'/'.$ulsfn.".meta") { 1322: open(FILE, $ulsdir.'/'.$ulsfn.".meta"); 1323: my @obsolete=<FILE>; 1324: foreach my $obsolete (@obsolete) { 1325: if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; } 1326: if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; } 1327: } 1328: } 1329: $ulsout.=$ulsfn.'&'.join('&',@ulsstats); 1330: if($obs eq '1') { $ulsout.="&1"; } 1331: else { $ulsout.="&0"; } 1332: if($rights eq '1') { $ulsout.="&1:"; } 1333: else { $ulsout.="&0:"; } 1334: } 1335: closedir(LSDIR); 1336: } 1337: } else { 1338: my @ulsstats=stat($ulsdir); 1339: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':'; 1340: } 1341: } else { 1342: $ulsout='no_such_dir'; 1343: } 1344: if ($ulsout eq '') { $ulsout='empty'; } 1345: &Reply($client, "$ulsout\n", $userinput); # This supports debug logging. 1346: 1347: return 1; 1348: 1349: } 1350: &register_handler("ls", \&ls_handler, 0, 1, 0); 1351: 1352: # 1353: # Please also see the ls_handler, which this routine obosolets. 1354: # ls2_handler differs from ls_handler in that it escapes its return 1355: # values before concatenating them together with ':'s. 1356: # 1357: # ls2 - list the contents of a directory. For each file in the 1358: # selected directory the filename followed by the full output of 1359: # the stat function is returned. The returned info for each 1360: # file are separated by ':'. The stat fields are separated by &'s. 1361: # Parameters: 1362: # $cmd - The command that dispatched us (ls). 1363: # $ulsdir - The directory path to list... I'm not sure what this 1364: # is relative as things like ls:. return e.g. 1365: # no_such_dir. 1366: # $client - Socket open on the client. 1367: # Returns: 1368: # 1 - indicating that the daemon should not disconnect. 1369: # Side Effects: 1370: # The reply is written to $client. 1371: # 1372: sub ls2_handler { 1373: my ($cmd, $ulsdir, $client) = @_; 1374: 1375: my $userinput = "$cmd:$ulsdir"; 1376: 1377: my $obs; 1378: my $rights; 1379: my $ulsout=''; 1380: my $ulsfn; 1381: if (-e $ulsdir) { 1382: if(-d $ulsdir) { 1383: if (opendir(LSDIR,$ulsdir)) { 1384: while ($ulsfn=readdir(LSDIR)) { 1385: undef($obs); 1386: undef($rights); 1387: my @ulsstats=stat($ulsdir.'/'.$ulsfn); 1388: #We do some obsolete checking here 1389: if(-e $ulsdir.'/'.$ulsfn.".meta") { 1390: open(FILE, $ulsdir.'/'.$ulsfn.".meta"); 1391: my @obsolete=<FILE>; 1392: foreach my $obsolete (@obsolete) { 1393: if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; } 1394: if($obsolete =~ m|(<copyright>)(default)|) { 1395: $rights = 1; 1396: } 1397: } 1398: } 1399: my $tmp = $ulsfn.'&'.join('&',@ulsstats); 1400: if ($obs eq '1') { $tmp.="&1"; } else { $tmp.="&0"; } 1401: if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; } 1402: $ulsout.= &escape($tmp).':'; 1403: } 1404: closedir(LSDIR); 1405: } 1406: } else { 1407: my @ulsstats=stat($ulsdir); 1408: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':'; 1409: } 1410: } else { 1411: $ulsout='no_such_dir'; 1412: } 1413: if ($ulsout eq '') { $ulsout='empty'; } 1414: &Reply($client, "$ulsout\n", $userinput); # This supports debug logging. 1415: return 1; 1416: } 1417: &register_handler("ls2", \&ls2_handler, 0, 1, 0); 1418: 1419: # Process a reinit request. Reinit requests that either 1420: # lonc or lond be reinitialized so that an updated 1421: # host.tab or domain.tab can be processed. 1422: # 1423: # Parameters: 1424: # $cmd - the actual keyword that invoked us. 1425: # $tail - the tail of the request that invoked us. 1426: # $client - File descriptor connected to the client 1427: # Returns: 1428: # 1 - Ok to continue processing. 1429: # 0 - Program should exit 1430: # Implicit output: 1431: # a reply is sent to the client. 1432: # 1433: sub reinit_process_handler { 1434: my ($cmd, $tail, $client) = @_; 1435: 1436: my $userinput = "$cmd:$tail"; 1437: 1438: my $cert = &GetCertificate($userinput); 1439: if(&ValidManager($cert)) { 1440: chomp($userinput); 1441: my $reply = &ReinitProcess($userinput); 1442: &Reply( $client, "$reply\n", $userinput); 1443: } else { 1444: &Failure( $client, "refused\n", $userinput); 1445: } 1446: return 1; 1447: } 1448: &register_handler("reinit", \&reinit_process_handler, 1, 0, 1); 1449: 1450: # Process the editing script for a table edit operation. 1451: # the editing operation must be encrypted and requested by 1452: # a manager host. 1453: # 1454: # Parameters: 1455: # $cmd - the actual keyword that invoked us. 1456: # $tail - the tail of the request that invoked us. 1457: # $client - File descriptor connected to the client 1458: # Returns: 1459: # 1 - Ok to continue processing. 1460: # 0 - Program should exit 1461: # Implicit output: 1462: # a reply is sent to the client. 1463: # 1464: sub edit_table_handler { 1465: my ($command, $tail, $client) = @_; 1466: 1467: my $userinput = "$command:$tail"; 1468: 1469: my $cert = &GetCertificate($userinput); 1470: if(&ValidManager($cert)) { 1471: my($filetype, $script) = split(/:/, $tail); 1472: if (($filetype eq "hosts") || 1473: ($filetype eq "domain")) { 1474: if($script ne "") { 1475: &Reply($client, # BUGBUG - EditFile 1476: &EditFile($userinput), # could fail. 1477: $userinput); 1478: } else { 1479: &Failure($client,"refused\n",$userinput); 1480: } 1481: } else { 1482: &Failure($client,"refused\n",$userinput); 1483: } 1484: } else { 1485: &Failure($client,"refused\n",$userinput); 1486: } 1487: return 1; 1488: } 1489: &register_handler("edit", \&edit_table_handler, 1, 0, 1); 1490: 1491: # 1492: # Authenticate a user against the LonCAPA authentication 1493: # database. Note that there are several authentication 1494: # possibilities: 1495: # - unix - The user can be authenticated against the unix 1496: # password file. 1497: # - internal - The user can be authenticated against a purely 1498: # internal per user password file. 1499: # - kerberos - The user can be authenticated against either a kerb4 or kerb5 1500: # ticket granting authority. 1501: # - user - The person tailoring LonCAPA can supply a user authentication 1502: # mechanism that is per system. 1503: # 1504: # Parameters: 1505: # $cmd - The command that got us here. 1506: # $tail - Tail of the command (remaining parameters). 1507: # $client - File descriptor connected to client. 1508: # Returns 1509: # 0 - Requested to exit, caller should shut down. 1510: # 1 - Continue processing. 1511: # Implicit inputs: 1512: # The authentication systems describe above have their own forms of implicit 1513: # input into the authentication process that are described above. 1514: # 1515: sub authenticate_handler { 1516: my ($cmd, $tail, $client) = @_; 1517: 1518: 1519: # Regenerate the full input line 1520: 1521: my $userinput = $cmd.":".$tail; 1522: 1523: # udom - User's domain. 1524: # uname - Username. 1525: # upass - User's password. 1526: 1527: my ($udom,$uname,$upass)=split(/:/,$tail); 1528: &Debug(" Authenticate domain = $udom, user = $uname, password = $upass"); 1529: chomp($upass); 1530: $upass=&unescape($upass); 1531: 1532: my $pwdcorrect = &validate_user($udom, $uname, $upass); 1533: if($pwdcorrect) { 1534: &Reply( $client, "authorized\n", $userinput); 1535: # 1536: # Bad credentials: Failed to authorize 1537: # 1538: } else { 1539: &Failure( $client, "non_authorized\n", $userinput); 1540: } 1541: 1542: return 1; 1543: } 1544: &register_handler("auth", \&authenticate_handler, 1, 1, 0); 1545: 1546: # 1547: # Change a user's password. Note that this function is complicated by 1548: # the fact that a user may be authenticated in more than one way: 1549: # At present, we are not able to change the password for all types of 1550: # authentication methods. Only for: 1551: # unix - unix password or shadow passoword style authentication. 1552: # local - Locally written authentication mechanism. 1553: # For now, kerb4 and kerb5 password changes are not supported and result 1554: # in an error. 1555: # FUTURE WORK: 1556: # Support kerberos passwd changes? 1557: # Parameters: 1558: # $cmd - The command that got us here. 1559: # $tail - Tail of the command (remaining parameters). 1560: # $client - File descriptor connected to client. 1561: # Returns 1562: # 0 - Requested to exit, caller should shut down. 1563: # 1 - Continue processing. 1564: # Implicit inputs: 1565: # The authentication systems describe above have their own forms of implicit 1566: # input into the authentication process that are described above. 1567: sub change_password_handler { 1568: my ($cmd, $tail, $client) = @_; 1569: 1570: my $userinput = $cmd.":".$tail; # Reconstruct client's string. 1571: 1572: # 1573: # udom - user's domain. 1574: # uname - Username. 1575: # upass - Current password. 1576: # npass - New password. 1577: # context - Context in which this was called 1578: # (preferences or reset_by_email). 1579: 1580: my ($udom,$uname,$upass,$npass,$context)=split(/:/,$tail); 1581: 1582: $upass=&unescape($upass); 1583: $npass=&unescape($npass); 1584: &Debug("Trying to change password for $uname"); 1585: 1586: # First require that the user can be authenticated with their 1587: # old password unless context was 'reset_by_email': 1588: 1589: my $validated; 1590: if ($context eq 'reset_by_email') { 1591: $validated = 1; 1592: } else { 1593: $validated = &validate_user($udom, $uname, $upass); 1594: } 1595: if($validated) { 1596: my $realpasswd = &get_auth_type($udom, $uname); # Defined since authd. 1597: 1598: my ($howpwd,$contentpwd)=split(/:/,$realpasswd); 1599: if ($howpwd eq 'internal') { 1600: &Debug("internal auth"); 1601: my $salt=time; 1602: $salt=substr($salt,6,2); 1603: my $ncpass=crypt($npass,$salt); 1604: if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) { 1605: &logthis("Result of password change for " 1606: ."$uname: pwchange_success"); 1607: &Reply($client, "ok\n", $userinput); 1608: } else { 1609: &logthis("Unable to open $uname passwd " 1610: ."to change password"); 1611: &Failure( $client, "non_authorized\n",$userinput); 1612: } 1613: } elsif ($howpwd eq 'unix' && $context ne 'reset_by_email') { 1614: my $result = &change_unix_password($uname, $npass); 1615: &logthis("Result of password change for $uname: ". 1616: $result); 1617: &Reply($client, "$result\n", $userinput); 1618: } else { 1619: # this just means that the current password mode is not 1620: # one we know how to change (e.g the kerberos auth modes or 1621: # locally written auth handler). 1622: # 1623: &Failure( $client, "auth_mode_error\n", $userinput); 1624: } 1625: 1626: } else { 1627: &Failure( $client, "non_authorized\n", $userinput); 1628: } 1629: 1630: return 1; 1631: } 1632: &register_handler("passwd", \&change_password_handler, 1, 1, 0); 1633: 1634: # 1635: # Create a new user. User in this case means a lon-capa user. 1636: # The user must either already exist in some authentication realm 1637: # like kerberos or the /etc/passwd. If not, a user completely local to 1638: # this loncapa system is created. 1639: # 1640: # Parameters: 1641: # $cmd - The command that got us here. 1642: # $tail - Tail of the command (remaining parameters). 1643: # $client - File descriptor connected to client. 1644: # Returns 1645: # 0 - Requested to exit, caller should shut down. 1646: # 1 - Continue processing. 1647: # Implicit inputs: 1648: # The authentication systems describe above have their own forms of implicit 1649: # input into the authentication process that are described above. 1650: sub add_user_handler { 1651: 1652: my ($cmd, $tail, $client) = @_; 1653: 1654: 1655: my ($udom,$uname,$umode,$npass)=split(/:/,$tail); 1656: my $userinput = $cmd.":".$tail; # Reconstruct the full request line. 1657: 1658: &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname); 1659: 1660: 1661: if($udom eq $currentdomainid) { # Reject new users for other domains... 1662: 1663: my $oldumask=umask(0077); 1664: chomp($npass); 1665: $npass=&unescape($npass); 1666: my $passfilename = &password_path($udom, $uname); 1667: &Debug("Password file created will be:".$passfilename); 1668: if (-e $passfilename) { 1669: &Failure( $client, "already_exists\n", $userinput); 1670: } else { 1671: my $fperror=''; 1672: if (!&mkpath($passfilename)) { 1673: $fperror="error: ".($!+0)." mkdir failed while attempting " 1674: ."makeuser"; 1675: } 1676: unless ($fperror) { 1677: my $result=&make_passwd_file($uname, $umode,$npass, $passfilename); 1678: &Reply($client, $result, $userinput); #BUGBUG - could be fail 1679: } else { 1680: &Failure($client, "$fperror\n", $userinput); 1681: } 1682: } 1683: umask($oldumask); 1684: } else { 1685: &Failure($client, "not_right_domain\n", 1686: $userinput); # Even if we are multihomed. 1687: 1688: } 1689: return 1; 1690: 1691: } 1692: &register_handler("makeuser", \&add_user_handler, 1, 1, 0); 1693: 1694: # 1695: # Change the authentication method of a user. Note that this may 1696: # also implicitly change the user's password if, for example, the user is 1697: # joining an existing authentication realm. Known authentication realms at 1698: # this time are: 1699: # internal - Purely internal password file (only loncapa knows this user) 1700: # local - Institutionally written authentication module. 1701: # unix - Unix user (/etc/passwd with or without /etc/shadow). 1702: # kerb4 - kerberos version 4 1703: # kerb5 - kerberos version 5 1704: # 1705: # Parameters: 1706: # $cmd - The command that got us here. 1707: # $tail - Tail of the command (remaining parameters). 1708: # $client - File descriptor connected to client. 1709: # Returns 1710: # 0 - Requested to exit, caller should shut down. 1711: # 1 - Continue processing. 1712: # Implicit inputs: 1713: # The authentication systems describe above have their own forms of implicit 1714: # input into the authentication process that are described above. 1715: # NOTE: 1716: # This is also used to change the authentication credential values (e.g. passwd). 1717: # 1718: # 1719: sub change_authentication_handler { 1720: 1721: my ($cmd, $tail, $client) = @_; 1722: 1723: my $userinput = "$cmd:$tail"; # Reconstruct user input. 1724: 1725: my ($udom,$uname,$umode,$npass)=split(/:/,$tail); 1726: &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode); 1727: if ($udom ne $currentdomainid) { 1728: &Failure( $client, "not_right_domain\n", $client); 1729: } else { 1730: 1731: chomp($npass); 1732: 1733: $npass=&unescape($npass); 1734: my $oldauth = &get_auth_type($udom, $uname); # Get old auth info. 1735: my $passfilename = &password_path($udom, $uname); 1736: if ($passfilename) { # Not allowed to create a new user!! 1737: # If just changing the unix passwd. need to arrange to run 1738: # passwd since otherwise make_passwd_file will run 1739: # lcuseradd which fails if an account already exists 1740: # (to prevent an unscrupulous LONCAPA admin from stealing 1741: # an existing account by overwriting it as a LonCAPA account). 1742: 1743: if(($oldauth =~/^unix/) && ($umode eq "unix")) { 1744: my $result = &change_unix_password($uname, $npass); 1745: &logthis("Result of password change for $uname: ".$result); 1746: if ($result eq "ok") { 1747: &Reply($client, "$result\n") 1748: } else { 1749: &Failure($client, "$result\n"); 1750: } 1751: } else { 1752: my $result=&make_passwd_file($uname, $umode,$npass,$passfilename); 1753: # 1754: # If the current auth mode is internal, and the old auth mode was 1755: # unix, or krb*, and the user is an author for this domain, 1756: # re-run manage_permissions for that role in order to be able 1757: # to take ownership of the construction space back to www:www 1758: # 1759: 1760: 1761: if( (($oldauth =~ /^unix/) && ($umode eq "internal")) || 1762: (($oldauth =~ /^internal/) && ($umode eq "unix")) ) { 1763: if(&is_author($udom, $uname)) { 1764: &Debug(" Need to manage author permissions..."); 1765: &manage_permissions("/$udom/_au", $udom, $uname, "$umode:"); 1766: } 1767: } 1768: &Reply($client, $result, $userinput); 1769: } 1770: 1771: 1772: } else { 1773: &Failure($client, "non_authorized\n", $userinput); # Fail the user now. 1774: } 1775: } 1776: return 1; 1777: } 1778: &register_handler("changeuserauth", \&change_authentication_handler, 1,1, 0); 1779: 1780: # 1781: # Determines if this is the home server for a user. The home server 1782: # for a user will have his/her lon-capa passwd file. Therefore all we need 1783: # to do is determine if this file exists. 1784: # 1785: # Parameters: 1786: # $cmd - The command that got us here. 1787: # $tail - Tail of the command (remaining parameters). 1788: # $client - File descriptor connected to client. 1789: # Returns 1790: # 0 - Requested to exit, caller should shut down. 1791: # 1 - Continue processing. 1792: # Implicit inputs: 1793: # The authentication systems describe above have their own forms of implicit 1794: # input into the authentication process that are described above. 1795: # 1796: sub is_home_handler { 1797: my ($cmd, $tail, $client) = @_; 1798: 1799: my $userinput = "$cmd:$tail"; 1800: 1801: my ($udom,$uname)=split(/:/,$tail); 1802: chomp($uname); 1803: my $passfile = &password_filename($udom, $uname); 1804: if($passfile) { 1805: &Reply( $client, "found\n", $userinput); 1806: } else { 1807: &Failure($client, "not_found\n", $userinput); 1808: } 1809: return 1; 1810: } 1811: &register_handler("home", \&is_home_handler, 0,1,0); 1812: 1813: # 1814: # Process an update request for a resource?? I think what's going on here is 1815: # that a resource has been modified that we hold a subscription to. 1816: # If the resource is not local, then we must update, or at least invalidate our 1817: # cached copy of the resource. 1818: # FUTURE WORK: 1819: # I need to look at this logic carefully. My druthers would be to follow 1820: # typical caching logic, and simple invalidate the cache, drop any subscription 1821: # an let the next fetch start the ball rolling again... however that may 1822: # actually be more difficult than it looks given the complex web of 1823: # proxy servers. 1824: # Parameters: 1825: # $cmd - The command that got us here. 1826: # $tail - Tail of the command (remaining parameters). 1827: # $client - File descriptor connected to client. 1828: # Returns 1829: # 0 - Requested to exit, caller should shut down. 1830: # 1 - Continue processing. 1831: # Implicit inputs: 1832: # The authentication systems describe above have their own forms of implicit 1833: # input into the authentication process that are described above. 1834: # 1835: sub update_resource_handler { 1836: 1837: my ($cmd, $tail, $client) = @_; 1838: 1839: my $userinput = "$cmd:$tail"; 1840: 1841: my $fname= $tail; # This allows interactive testing 1842: 1843: 1844: my $ownership=ishome($fname); 1845: if ($ownership eq 'not_owner') { 1846: if (-e $fname) { 1847: my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size, 1848: $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname); 1849: my $now=time; 1850: my $since=$now-$atime; 1851: if ($since>$perlvar{'lonExpire'}) { 1852: my $reply=&reply("unsub:$fname","$clientname"); 1853: &devalidate_meta_cache($fname); 1854: unlink("$fname"); 1855: unlink("$fname.meta"); 1856: } else { 1857: my $transname="$fname.in.transfer"; 1858: my $remoteurl=&reply("sub:$fname","$clientname"); 1859: my $response; 1860: alarm(120); 1861: { 1862: my $ua=new LWP::UserAgent; 1863: my $request=new HTTP::Request('GET',"$remoteurl"); 1864: $response=$ua->request($request,$transname); 1865: } 1866: alarm(0); 1867: if ($response->is_error()) { 1868: unlink($transname); 1869: my $message=$response->status_line; 1870: &logthis("LWP GET: $message for $fname ($remoteurl)"); 1871: } else { 1872: if ($remoteurl!~/\.meta$/) { 1873: alarm(120); 1874: { 1875: my $ua=new LWP::UserAgent; 1876: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta'); 1877: my $mresponse=$ua->request($mrequest,$fname.'.meta'); 1878: if ($mresponse->is_error()) { 1879: unlink($fname.'.meta'); 1880: } 1881: } 1882: alarm(0); 1883: } 1884: rename($transname,$fname); 1885: &devalidate_meta_cache($fname); 1886: } 1887: } 1888: &Reply( $client, "ok\n", $userinput); 1889: } else { 1890: &Failure($client, "not_found\n", $userinput); 1891: } 1892: } else { 1893: &Failure($client, "rejected\n", $userinput); 1894: } 1895: return 1; 1896: } 1897: &register_handler("update", \&update_resource_handler, 0 ,1, 0); 1898: 1899: sub devalidate_meta_cache { 1900: my ($url) = @_; 1901: use Cache::Memcached; 1902: my $memcache = new Cache::Memcached({'servers'=>['127.0.0.1:11211']}); 1903: $url = &declutter($url); 1904: $url =~ s-\.meta$--; 1905: my $id = &escape('meta:'.$url); 1906: $memcache->delete($id); 1907: } 1908: 1909: sub declutter { 1910: my $thisfn=shift; 1911: $thisfn=~s/^\Q$perlvar{'lonDocRoot'}\E//; 1912: $thisfn=~s/^\///; 1913: $thisfn=~s|^adm/wrapper/||; 1914: $thisfn=~s|^adm/coursedocs/showdoc/||; 1915: $thisfn=~s/^res\///; 1916: $thisfn=~s/\?.+$//; 1917: return $thisfn; 1918: } 1919: # 1920: # Fetch a user file from a remote server to the user's home directory 1921: # userfiles subdir. 1922: # Parameters: 1923: # $cmd - The command that got us here. 1924: # $tail - Tail of the command (remaining parameters). 1925: # $client - File descriptor connected to client. 1926: # Returns 1927: # 0 - Requested to exit, caller should shut down. 1928: # 1 - Continue processing. 1929: # 1930: sub fetch_user_file_handler { 1931: 1932: my ($cmd, $tail, $client) = @_; 1933: 1934: my $userinput = "$cmd:$tail"; 1935: my $fname = $tail; 1936: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|); 1937: my $udir=&propath($udom,$uname).'/userfiles'; 1938: unless (-e $udir) { 1939: mkdir($udir,0770); 1940: } 1941: Debug("fetch user file for $fname"); 1942: if (-e $udir) { 1943: $ufile=~s/^[\.\~]+//; 1944: 1945: # IF necessary, create the path right down to the file. 1946: # Note that any regular files in the way of this path are 1947: # wiped out to deal with some earlier folly of mine. 1948: 1949: if (!&mkpath($udir.'/'.$ufile)) { 1950: &Failure($client, "unable_to_create\n", $userinput); 1951: } 1952: 1953: my $destname=$udir.'/'.$ufile; 1954: my $transname=$udir.'/'.$ufile.'.in.transit'; 1955: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname; 1956: my $response; 1957: Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname"); 1958: alarm(120); 1959: { 1960: my $ua=new LWP::UserAgent; 1961: my $request=new HTTP::Request('GET',"$remoteurl"); 1962: $response=$ua->request($request,$transname); 1963: } 1964: alarm(0); 1965: if ($response->is_error()) { 1966: unlink($transname); 1967: my $message=$response->status_line; 1968: &logthis("LWP GET: $message for $fname ($remoteurl)"); 1969: &Failure($client, "failed\n", $userinput); 1970: } else { 1971: Debug("Renaming $transname to $destname"); 1972: if (!rename($transname,$destname)) { 1973: &logthis("Unable to move $transname to $destname"); 1974: unlink($transname); 1975: &Failure($client, "failed\n", $userinput); 1976: } else { 1977: &Reply($client, "ok\n", $userinput); 1978: } 1979: } 1980: } else { 1981: &Failure($client, "not_home\n", $userinput); 1982: } 1983: return 1; 1984: } 1985: &register_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0); 1986: 1987: # 1988: # Remove a file from a user's home directory userfiles subdirectory. 1989: # Parameters: 1990: # cmd - the Lond request keyword that got us here. 1991: # tail - the part of the command past the keyword. 1992: # client- File descriptor connected with the client. 1993: # 1994: # Returns: 1995: # 1 - Continue processing. 1996: sub remove_user_file_handler { 1997: my ($cmd, $tail, $client) = @_; 1998: 1999: my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent. 2000: 2001: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|); 2002: if ($ufile =~m|/\.\./|) { 2003: # any files paths with /../ in them refuse 2004: # to deal with 2005: &Failure($client, "refused\n", "$cmd:$tail"); 2006: } else { 2007: my $udir = &propath($udom,$uname); 2008: if (-e $udir) { 2009: my $file=$udir.'/userfiles/'.$ufile; 2010: if (-e $file) { 2011: # 2012: # If the file is a regular file unlink is fine... 2013: # However it's possible the client wants a dir. 2014: # removed, in which case rmdir is more approprate: 2015: # 2016: if (-f $file){ 2017: unlink($file); 2018: } elsif(-d $file) { 2019: rmdir($file); 2020: } 2021: if (-e $file) { 2022: # File is still there after we deleted it ?!? 2023: 2024: &Failure($client, "failed\n", "$cmd:$tail"); 2025: } else { 2026: &Reply($client, "ok\n", "$cmd:$tail"); 2027: } 2028: } else { 2029: &Failure($client, "not_found\n", "$cmd:$tail"); 2030: } 2031: } else { 2032: &Failure($client, "not_home\n", "$cmd:$tail"); 2033: } 2034: } 2035: return 1; 2036: } 2037: &register_handler("removeuserfile", \&remove_user_file_handler, 0,1,0); 2038: 2039: # 2040: # make a directory in a user's home directory userfiles subdirectory. 2041: # Parameters: 2042: # cmd - the Lond request keyword that got us here. 2043: # tail - the part of the command past the keyword. 2044: # client- File descriptor connected with the client. 2045: # 2046: # Returns: 2047: # 1 - Continue processing. 2048: sub mkdir_user_file_handler { 2049: my ($cmd, $tail, $client) = @_; 2050: 2051: my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent. 2052: $dir=&unescape($dir); 2053: my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|); 2054: if ($ufile =~m|/\.\./|) { 2055: # any files paths with /../ in them refuse 2056: # to deal with 2057: &Failure($client, "refused\n", "$cmd:$tail"); 2058: } else { 2059: my $udir = &propath($udom,$uname); 2060: if (-e $udir) { 2061: my $newdir=$udir.'/userfiles/'.$ufile.'/'; 2062: if (!&mkpath($newdir)) { 2063: &Failure($client, "failed\n", "$cmd:$tail"); 2064: } 2065: &Reply($client, "ok\n", "$cmd:$tail"); 2066: } else { 2067: &Failure($client, "not_home\n", "$cmd:$tail"); 2068: } 2069: } 2070: return 1; 2071: } 2072: &register_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0); 2073: 2074: # 2075: # rename a file in a user's home directory userfiles subdirectory. 2076: # Parameters: 2077: # cmd - the Lond request keyword that got us here. 2078: # tail - the part of the command past the keyword. 2079: # client- File descriptor connected with the client. 2080: # 2081: # Returns: 2082: # 1 - Continue processing. 2083: sub rename_user_file_handler { 2084: my ($cmd, $tail, $client) = @_; 2085: 2086: my ($udom,$uname,$old,$new) = split(/:/, $tail); 2087: $old=&unescape($old); 2088: $new=&unescape($new); 2089: if ($new =~m|/\.\./| || $old =~m|/\.\./|) { 2090: # any files paths with /../ in them refuse to deal with 2091: &Failure($client, "refused\n", "$cmd:$tail"); 2092: } else { 2093: my $udir = &propath($udom,$uname); 2094: if (-e $udir) { 2095: my $oldfile=$udir.'/userfiles/'.$old; 2096: my $newfile=$udir.'/userfiles/'.$new; 2097: if (-e $newfile) { 2098: &Failure($client, "exists\n", "$cmd:$tail"); 2099: } elsif (! -e $oldfile) { 2100: &Failure($client, "not_found\n", "$cmd:$tail"); 2101: } else { 2102: if (!rename($oldfile,$newfile)) { 2103: &Failure($client, "failed\n", "$cmd:$tail"); 2104: } else { 2105: &Reply($client, "ok\n", "$cmd:$tail"); 2106: } 2107: } 2108: } else { 2109: &Failure($client, "not_home\n", "$cmd:$tail"); 2110: } 2111: } 2112: return 1; 2113: } 2114: &register_handler("renameuserfile", \&rename_user_file_handler, 0,1,0); 2115: 2116: # 2117: # Authenticate access to a user file by checking that the token the user's 2118: # passed also exists in their session file 2119: # 2120: # Parameters: 2121: # cmd - The request keyword that dispatched to tus. 2122: # tail - The tail of the request (colon separated parameters). 2123: # client - Filehandle open on the client. 2124: # Return: 2125: # 1. 2126: sub token_auth_user_file_handler { 2127: my ($cmd, $tail, $client) = @_; 2128: 2129: my ($fname, $session) = split(/:/, $tail); 2130: 2131: chomp($session); 2132: my $reply="non_auth\n"; 2133: my $file = $perlvar{'lonIDsDir'}.'/'.$session.'.id'; 2134: if (open(ENVIN,"$file")) { 2135: flock(ENVIN,LOCK_SH); 2136: tie(my %disk_env,'GDBM_File',"$file",&GDBM_READER(),0640); 2137: if (exists($disk_env{"userfile.$fname"})) { 2138: $reply="ok\n"; 2139: } else { 2140: foreach my $envname (keys(%disk_env)) { 2141: if ($envname=~ m|^userfile\.\Q$fname\E|) { 2142: $reply="ok\n"; 2143: last; 2144: } 2145: } 2146: } 2147: untie(%disk_env); 2148: close(ENVIN); 2149: &Reply($client, $reply, "$cmd:$tail"); 2150: } else { 2151: &Failure($client, "invalid_token\n", "$cmd:$tail"); 2152: } 2153: return 1; 2154: 2155: } 2156: &register_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0); 2157: 2158: # 2159: # Unsubscribe from a resource. 2160: # 2161: # Parameters: 2162: # $cmd - The command that got us here. 2163: # $tail - Tail of the command (remaining parameters). 2164: # $client - File descriptor connected to client. 2165: # Returns 2166: # 0 - Requested to exit, caller should shut down. 2167: # 1 - Continue processing. 2168: # 2169: sub unsubscribe_handler { 2170: my ($cmd, $tail, $client) = @_; 2171: 2172: my $userinput= "$cmd:$tail"; 2173: 2174: my ($fname) = split(/:/,$tail); # Split in case there's extrs. 2175: 2176: &Debug("Unsubscribing $fname"); 2177: if (-e $fname) { 2178: &Debug("Exists"); 2179: &Reply($client, &unsub($fname,$clientip), $userinput); 2180: } else { 2181: &Failure($client, "not_found\n", $userinput); 2182: } 2183: return 1; 2184: } 2185: &register_handler("unsub", \&unsubscribe_handler, 0, 1, 0); 2186: 2187: # Subscribe to a resource 2188: # 2189: # Parameters: 2190: # $cmd - The command that got us here. 2191: # $tail - Tail of the command (remaining parameters). 2192: # $client - File descriptor connected to client. 2193: # Returns 2194: # 0 - Requested to exit, caller should shut down. 2195: # 1 - Continue processing. 2196: # 2197: sub subscribe_handler { 2198: my ($cmd, $tail, $client)= @_; 2199: 2200: my $userinput = "$cmd:$tail"; 2201: 2202: &Reply( $client, &subscribe($userinput,$clientip), $userinput); 2203: 2204: return 1; 2205: } 2206: &register_handler("sub", \&subscribe_handler, 0, 1, 0); 2207: 2208: # 2209: # Determine the version of a resource (?) Or is it return 2210: # the top version of the resource? Not yet clear from the 2211: # code in currentversion. 2212: # 2213: # Parameters: 2214: # $cmd - The command that got us here. 2215: # $tail - Tail of the command (remaining parameters). 2216: # $client - File descriptor connected to client. 2217: # Returns 2218: # 0 - Requested to exit, caller should shut down. 2219: # 1 - Continue processing. 2220: # 2221: sub current_version_handler { 2222: my ($cmd, $tail, $client) = @_; 2223: 2224: my $userinput= "$cmd:$tail"; 2225: 2226: my $fname = $tail; 2227: &Reply( $client, &currentversion($fname)."\n", $userinput); 2228: return 1; 2229: 2230: } 2231: &register_handler("currentversion", \&current_version_handler, 0, 1, 0); 2232: 2233: # Make an entry in a user's activity log. 2234: # 2235: # Parameters: 2236: # $cmd - The command that got us here. 2237: # $tail - Tail of the command (remaining parameters). 2238: # $client - File descriptor connected to client. 2239: # Returns 2240: # 0 - Requested to exit, caller should shut down. 2241: # 1 - Continue processing. 2242: # 2243: sub activity_log_handler { 2244: my ($cmd, $tail, $client) = @_; 2245: 2246: 2247: my $userinput= "$cmd:$tail"; 2248: 2249: my ($udom,$uname,$what)=split(/:/,$tail); 2250: chomp($what); 2251: my $proname=&propath($udom,$uname); 2252: my $now=time; 2253: my $hfh; 2254: if ($hfh=IO::File->new(">>$proname/activity.log")) { 2255: print $hfh "$now:$clientname:$what\n"; 2256: &Reply( $client, "ok\n", $userinput); 2257: } else { 2258: &Failure($client, "error: ".($!+0)." IO::File->new Failed " 2259: ."while attempting log\n", 2260: $userinput); 2261: } 2262: 2263: return 1; 2264: } 2265: &register_handler("log", \&activity_log_handler, 0, 1, 0); 2266: 2267: # 2268: # Put a namespace entry in a user profile hash. 2269: # My druthers would be for this to be an encrypted interaction too. 2270: # anything that might be an inadvertent covert channel about either 2271: # user authentication or user personal information.... 2272: # 2273: # Parameters: 2274: # $cmd - The command that got us here. 2275: # $tail - Tail of the command (remaining parameters). 2276: # $client - File descriptor connected to client. 2277: # Returns 2278: # 0 - Requested to exit, caller should shut down. 2279: # 1 - Continue processing. 2280: # 2281: sub put_user_profile_entry { 2282: my ($cmd, $tail, $client) = @_; 2283: 2284: my $userinput = "$cmd:$tail"; 2285: 2286: my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4); 2287: if ($namespace ne 'roles') { 2288: chomp($what); 2289: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2290: &GDBM_WRCREAT(),"P",$what); 2291: if($hashref) { 2292: my @pairs=split(/\&/,$what); 2293: foreach my $pair (@pairs) { 2294: my ($key,$value)=split(/=/,$pair); 2295: $hashref->{$key}=$value; 2296: } 2297: if (&untie_user_hash($hashref)) { 2298: &Reply( $client, "ok\n", $userinput); 2299: } else { 2300: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ". 2301: "while attempting put\n", 2302: $userinput); 2303: } 2304: } else { 2305: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2306: "while attempting put\n", $userinput); 2307: } 2308: } else { 2309: &Failure( $client, "refused\n", $userinput); 2310: } 2311: 2312: return 1; 2313: } 2314: &register_handler("put", \&put_user_profile_entry, 0, 1, 0); 2315: 2316: # Put a piece of new data in hash, returns error if entry already exists 2317: # Parameters: 2318: # $cmd - The command that got us here. 2319: # $tail - Tail of the command (remaining parameters). 2320: # $client - File descriptor connected to client. 2321: # Returns 2322: # 0 - Requested to exit, caller should shut down. 2323: # 1 - Continue processing. 2324: # 2325: sub newput_user_profile_entry { 2326: my ($cmd, $tail, $client) = @_; 2327: 2328: my $userinput = "$cmd:$tail"; 2329: 2330: my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4); 2331: if ($namespace eq 'roles') { 2332: &Failure( $client, "refused\n", $userinput); 2333: return 1; 2334: } 2335: 2336: chomp($what); 2337: 2338: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2339: &GDBM_WRCREAT(),"N",$what); 2340: if(!$hashref) { 2341: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2342: "while attempting put\n", $userinput); 2343: return 1; 2344: } 2345: 2346: my @pairs=split(/\&/,$what); 2347: foreach my $pair (@pairs) { 2348: my ($key,$value)=split(/=/,$pair); 2349: if (exists($hashref->{$key})) { 2350: &Failure($client, "key_exists: ".$key."\n",$userinput); 2351: return 1; 2352: } 2353: } 2354: 2355: foreach my $pair (@pairs) { 2356: my ($key,$value)=split(/=/,$pair); 2357: $hashref->{$key}=$value; 2358: } 2359: 2360: if (&untie_user_hash($hashref)) { 2361: &Reply( $client, "ok\n", $userinput); 2362: } else { 2363: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ". 2364: "while attempting put\n", 2365: $userinput); 2366: } 2367: return 1; 2368: } 2369: &register_handler("newput", \&newput_user_profile_entry, 0, 1, 0); 2370: 2371: # 2372: # Increment a profile entry in the user history file. 2373: # The history contains keyword value pairs. In this case, 2374: # The value itself is a pair of numbers. The first, the current value 2375: # the second an increment that this function applies to the current 2376: # value. 2377: # 2378: # Parameters: 2379: # $cmd - The command that got us here. 2380: # $tail - Tail of the command (remaining parameters). 2381: # $client - File descriptor connected to client. 2382: # Returns 2383: # 0 - Requested to exit, caller should shut down. 2384: # 1 - Continue processing. 2385: # 2386: sub increment_user_value_handler { 2387: my ($cmd, $tail, $client) = @_; 2388: 2389: my $userinput = "$cmd:$tail"; 2390: 2391: my ($udom,$uname,$namespace,$what) =split(/:/,$tail); 2392: if ($namespace ne 'roles') { 2393: chomp($what); 2394: my $hashref = &tie_user_hash($udom, $uname, 2395: $namespace, &GDBM_WRCREAT(), 2396: "P",$what); 2397: if ($hashref) { 2398: my @pairs=split(/\&/,$what); 2399: foreach my $pair (@pairs) { 2400: my ($key,$value)=split(/=/,$pair); 2401: $value = &unescape($value); 2402: # We could check that we have a number... 2403: if (! defined($value) || $value eq '') { 2404: $value = 1; 2405: } 2406: $hashref->{$key}+=$value; 2407: if ($namespace eq 'nohist_resourcetracker') { 2408: if ($hashref->{$key} < 0) { 2409: $hashref->{$key} = 0; 2410: } 2411: } 2412: } 2413: if (&untie_user_hash($hashref)) { 2414: &Reply( $client, "ok\n", $userinput); 2415: } else { 2416: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ". 2417: "while attempting inc\n", $userinput); 2418: } 2419: } else { 2420: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2421: "while attempting inc\n", $userinput); 2422: } 2423: } else { 2424: &Failure($client, "refused\n", $userinput); 2425: } 2426: 2427: return 1; 2428: } 2429: &register_handler("inc", \&increment_user_value_handler, 0, 1, 0); 2430: 2431: # 2432: # Put a new role for a user. Roles are LonCAPA's packaging of permissions. 2433: # Each 'role' a user has implies a set of permissions. Adding a new role 2434: # for a person grants the permissions packaged with that role 2435: # to that user when the role is selected. 2436: # 2437: # Parameters: 2438: # $cmd - The command string (rolesput). 2439: # $tail - The remainder of the request line. For rolesput this 2440: # consists of a colon separated list that contains: 2441: # The domain and user that is granting the role (logged). 2442: # The domain and user that is getting the role. 2443: # The roles being granted as a set of & separated pairs. 2444: # each pair a key value pair. 2445: # $client - File descriptor connected to the client. 2446: # Returns: 2447: # 0 - If the daemon should exit 2448: # 1 - To continue processing. 2449: # 2450: # 2451: sub roles_put_handler { 2452: my ($cmd, $tail, $client) = @_; 2453: 2454: my $userinput = "$cmd:$tail"; 2455: 2456: my ( $exedom, $exeuser, $udom, $uname, $what) = split(/:/,$tail); 2457: 2458: 2459: my $namespace='roles'; 2460: chomp($what); 2461: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2462: &GDBM_WRCREAT(), "P", 2463: "$exedom:$exeuser:$what"); 2464: # 2465: # Log the attempt to set a role. The {}'s here ensure that the file 2466: # handle is open for the minimal amount of time. Since the flush 2467: # is done on close this improves the chances the log will be an un- 2468: # corrupted ordered thing. 2469: if ($hashref) { 2470: my $pass_entry = &get_auth_type($udom, $uname); 2471: my ($auth_type,$pwd) = split(/:/, $pass_entry); 2472: $auth_type = $auth_type.":"; 2473: my @pairs=split(/\&/,$what); 2474: foreach my $pair (@pairs) { 2475: my ($key,$value)=split(/=/,$pair); 2476: &manage_permissions($key, $udom, $uname, 2477: $auth_type); 2478: $hashref->{$key}=$value; 2479: } 2480: if (&untie_user_hash($hashref)) { 2481: &Reply($client, "ok\n", $userinput); 2482: } else { 2483: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 2484: "while attempting rolesput\n", $userinput); 2485: } 2486: } else { 2487: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2488: "while attempting rolesput\n", $userinput); 2489: } 2490: return 1; 2491: } 2492: &register_handler("rolesput", \&roles_put_handler, 1,1,0); # Encoded client only. 2493: 2494: # 2495: # Deletes (removes) a role for a user. This is equivalent to removing 2496: # a permissions package associated with the role from the user's profile. 2497: # 2498: # Parameters: 2499: # $cmd - The command (rolesdel) 2500: # $tail - The remainder of the request line. This consists 2501: # of: 2502: # The domain and user requesting the change (logged) 2503: # The domain and user being changed. 2504: # The roles being revoked. These are shipped to us 2505: # as a bunch of & separated role name keywords. 2506: # $client - The file handle open on the client. 2507: # Returns: 2508: # 1 - Continue processing 2509: # 0 - Exit. 2510: # 2511: sub roles_delete_handler { 2512: my ($cmd, $tail, $client) = @_; 2513: 2514: my $userinput = "$cmd:$tail"; 2515: 2516: my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail); 2517: &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom. 2518: "what = ".$what); 2519: my $namespace='roles'; 2520: chomp($what); 2521: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2522: &GDBM_WRCREAT(), "D", 2523: "$exedom:$exeuser:$what"); 2524: 2525: if ($hashref) { 2526: my @rolekeys=split(/\&/,$what); 2527: 2528: foreach my $key (@rolekeys) { 2529: delete $hashref->{$key}; 2530: } 2531: if (&untie_user_hash($hashref)) { 2532: &Reply($client, "ok\n", $userinput); 2533: } else { 2534: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 2535: "while attempting rolesdel\n", $userinput); 2536: } 2537: } else { 2538: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2539: "while attempting rolesdel\n", $userinput); 2540: } 2541: 2542: return 1; 2543: } 2544: &register_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only 2545: 2546: # Unencrypted get from a user's profile database. See 2547: # GetProfileEntryEncrypted for a version that does end-to-end encryption. 2548: # This function retrieves a keyed item from a specific named database in the 2549: # user's directory. 2550: # 2551: # Parameters: 2552: # $cmd - Command request keyword (get). 2553: # $tail - Tail of the command. This is a colon separated list 2554: # consisting of the domain and username that uniquely 2555: # identifies the profile, 2556: # The 'namespace' which selects the gdbm file to 2557: # do the lookup in, 2558: # & separated list of keys to lookup. Note that 2559: # the values are returned as an & separated list too. 2560: # $client - File descriptor open on the client. 2561: # Returns: 2562: # 1 - Continue processing. 2563: # 0 - Exit. 2564: # 2565: sub get_profile_entry { 2566: my ($cmd, $tail, $client) = @_; 2567: 2568: my $userinput= "$cmd:$tail"; 2569: 2570: my ($udom,$uname,$namespace,$what) = split(/:/,$tail); 2571: chomp($what); 2572: 2573: my $replystring = read_profile($udom, $uname, $namespace, $what); 2574: my ($first) = split(/:/,$replystring); 2575: if($first ne "error") { 2576: &Reply($client, "$replystring\n", $userinput); 2577: } else { 2578: &Failure($client, $replystring." while attempting get\n", $userinput); 2579: } 2580: return 1; 2581: 2582: 2583: } 2584: &register_handler("get", \&get_profile_entry, 0,1,0); 2585: 2586: # 2587: # Process the encrypted get request. Note that the request is sent 2588: # in clear, but the reply is encrypted. This is a small covert channel: 2589: # information about the sensitive keys is given to the snooper. Just not 2590: # information about the values of the sensitive key. Hmm if I wanted to 2591: # know these I'd snoop for the egets. Get the profile item names from them 2592: # and then issue a get for them since there's no enforcement of the 2593: # requirement of an encrypted get for particular profile items. If I 2594: # were re-doing this, I'd force the request to be encrypted as well as the 2595: # reply. I'd also just enforce encrypted transactions for all gets since 2596: # that would prevent any covert channel snooping. 2597: # 2598: # Parameters: 2599: # $cmd - Command keyword of request (eget). 2600: # $tail - Tail of the command. See GetProfileEntry # for more information about this. 2601: # $client - File open on the client. 2602: # Returns: 2603: # 1 - Continue processing 2604: # 0 - server should exit. 2605: sub get_profile_entry_encrypted { 2606: my ($cmd, $tail, $client) = @_; 2607: 2608: my $userinput = "$cmd:$tail"; 2609: 2610: my ($udom,$uname,$namespace,$what) = split(/:/,$tail); 2611: chomp($what); 2612: my $qresult = read_profile($udom, $uname, $namespace, $what); 2613: my ($first) = split(/:/, $qresult); 2614: if($first ne "error") { 2615: 2616: if ($cipher) { 2617: my $cmdlength=length($qresult); 2618: $qresult.=" "; 2619: my $encqresult=''; 2620: for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) { 2621: $encqresult.= unpack("H16", 2622: $cipher->encrypt(substr($qresult, 2623: $encidx, 2624: 8))); 2625: } 2626: &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput); 2627: } else { 2628: &Failure( $client, "error:no_key\n", $userinput); 2629: } 2630: } else { 2631: &Failure($client, "$qresult while attempting eget\n", $userinput); 2632: 2633: } 2634: 2635: return 1; 2636: } 2637: &register_handler("eget", \&get_profile_entry_encrypted, 0, 1, 0); 2638: 2639: # 2640: # Deletes a key in a user profile database. 2641: # 2642: # Parameters: 2643: # $cmd - Command keyword (del). 2644: # $tail - Command tail. IN this case a colon 2645: # separated list containing: 2646: # The domain and user that identifies uniquely 2647: # the identity of the user. 2648: # The profile namespace (name of the profile 2649: # database file). 2650: # & separated list of keywords to delete. 2651: # $client - File open on client socket. 2652: # Returns: 2653: # 1 - Continue processing 2654: # 0 - Exit server. 2655: # 2656: # 2657: sub delete_profile_entry { 2658: my ($cmd, $tail, $client) = @_; 2659: 2660: my $userinput = "cmd:$tail"; 2661: 2662: my ($udom,$uname,$namespace,$what) = split(/:/,$tail); 2663: chomp($what); 2664: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2665: &GDBM_WRCREAT(), 2666: "D",$what); 2667: if ($hashref) { 2668: my @keys=split(/\&/,$what); 2669: foreach my $key (@keys) { 2670: delete($hashref->{$key}); 2671: } 2672: if (&untie_user_hash($hashref)) { 2673: &Reply($client, "ok\n", $userinput); 2674: } else { 2675: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2676: "while attempting del\n", $userinput); 2677: } 2678: } else { 2679: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2680: "while attempting del\n", $userinput); 2681: } 2682: return 1; 2683: } 2684: &register_handler("del", \&delete_profile_entry, 0, 1, 0); 2685: 2686: # 2687: # List the set of keys that are defined in a profile database file. 2688: # A successful reply from this will contain an & separated list of 2689: # the keys. 2690: # Parameters: 2691: # $cmd - Command request (keys). 2692: # $tail - Remainder of the request, a colon separated 2693: # list containing domain/user that identifies the 2694: # user being queried, and the database namespace 2695: # (database filename essentially). 2696: # $client - File open on the client. 2697: # Returns: 2698: # 1 - Continue processing. 2699: # 0 - Exit the server. 2700: # 2701: sub get_profile_keys { 2702: my ($cmd, $tail, $client) = @_; 2703: 2704: my $userinput = "$cmd:$tail"; 2705: 2706: my ($udom,$uname,$namespace)=split(/:/,$tail); 2707: my $qresult=''; 2708: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2709: &GDBM_READER()); 2710: if ($hashref) { 2711: foreach my $key (keys %$hashref) { 2712: $qresult.="$key&"; 2713: } 2714: if (&untie_user_hash($hashref)) { 2715: $qresult=~s/\&$//; 2716: &Reply($client, "$qresult\n", $userinput); 2717: } else { 2718: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2719: "while attempting keys\n", $userinput); 2720: } 2721: } else { 2722: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2723: "while attempting keys\n", $userinput); 2724: } 2725: 2726: return 1; 2727: } 2728: &register_handler("keys", \&get_profile_keys, 0, 1, 0); 2729: 2730: # 2731: # Dump the contents of a user profile database. 2732: # Note that this constitutes a very large covert channel too since 2733: # the dump will return sensitive information that is not encrypted. 2734: # The naive security assumption is that the session negotiation ensures 2735: # our client is trusted and I don't believe that's assured at present. 2736: # Sure want badly to go to ssl or tls. Of course if my peer isn't really 2737: # a LonCAPA node they could have negotiated an encryption key too so >sigh<. 2738: # 2739: # Parameters: 2740: # $cmd - The command request keyword (currentdump). 2741: # $tail - Remainder of the request, consisting of a colon 2742: # separated list that has the domain/username and 2743: # the namespace to dump (database file). 2744: # $client - file open on the remote client. 2745: # Returns: 2746: # 1 - Continue processing. 2747: # 0 - Exit the server. 2748: # 2749: sub dump_profile_database { 2750: my ($cmd, $tail, $client) = @_; 2751: 2752: my $userinput = "$cmd:$tail"; 2753: 2754: my ($udom,$uname,$namespace) = split(/:/,$tail); 2755: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2756: &GDBM_READER()); 2757: if ($hashref) { 2758: # Structure of %data: 2759: # $data{$symb}->{$parameter}=$value; 2760: # $data{$symb}->{'v.'.$parameter}=$version; 2761: # since $parameter will be unescaped, we do not 2762: # have to worry about silly parameter names... 2763: 2764: my $qresult=''; 2765: my %data = (); # A hash of anonymous hashes.. 2766: while (my ($key,$value) = each(%$hashref)) { 2767: my ($v,$symb,$param) = split(/:/,$key); 2768: next if ($v eq 'version' || $symb eq 'keys'); 2769: next if (exists($data{$symb}) && 2770: exists($data{$symb}->{$param}) && 2771: $data{$symb}->{'v.'.$param} > $v); 2772: $data{$symb}->{$param}=$value; 2773: $data{$symb}->{'v.'.$param}=$v; 2774: } 2775: if (&untie_user_hash($hashref)) { 2776: while (my ($symb,$param_hash) = each(%data)) { 2777: while(my ($param,$value) = each (%$param_hash)){ 2778: next if ($param =~ /^v\./); # Ignore versions... 2779: # 2780: # Just dump the symb=value pairs separated by & 2781: # 2782: $qresult.=$symb.':'.$param.'='.$value.'&'; 2783: } 2784: } 2785: chop($qresult); 2786: &Reply($client , "$qresult\n", $userinput); 2787: } else { 2788: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 2789: "while attempting currentdump\n", $userinput); 2790: } 2791: } else { 2792: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2793: "while attempting currentdump\n", $userinput); 2794: } 2795: 2796: return 1; 2797: } 2798: &register_handler("currentdump", \&dump_profile_database, 0, 1, 0); 2799: 2800: # 2801: # Dump a profile database with an optional regular expression 2802: # to match against the keys. In this dump, no effort is made 2803: # to separate symb from version information. Presumably the 2804: # databases that are dumped by this command are of a different 2805: # structure. Need to look at this and improve the documentation of 2806: # both this and the currentdump handler. 2807: # Parameters: 2808: # $cmd - The command keyword. 2809: # $tail - All of the characters after the $cmd: 2810: # These are expected to be a colon 2811: # separated list containing: 2812: # domain/user - identifying the user. 2813: # namespace - identifying the database. 2814: # regexp - optional regular expression 2815: # that is matched against 2816: # database keywords to do 2817: # selective dumps. 2818: # $client - Channel open on the client. 2819: # Returns: 2820: # 1 - Continue processing. 2821: # Side effects: 2822: # response is written to $client. 2823: # 2824: sub dump_with_regexp { 2825: my ($cmd, $tail, $client) = @_; 2826: 2827: 2828: my $userinput = "$cmd:$tail"; 2829: 2830: my ($udom,$uname,$namespace,$regexp,$range)=split(/:/,$tail); 2831: if (defined($regexp)) { 2832: $regexp=&unescape($regexp); 2833: } else { 2834: $regexp='.'; 2835: } 2836: my ($start,$end); 2837: if (defined($range)) { 2838: if ($range =~/^(\d+)\-(\d+)$/) { 2839: ($start,$end) = ($1,$2); 2840: } elsif ($range =~/^(\d+)$/) { 2841: ($start,$end) = (0,$1); 2842: } else { 2843: undef($range); 2844: } 2845: } 2846: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2847: &GDBM_READER()); 2848: if ($hashref) { 2849: my $qresult=''; 2850: my $count=0; 2851: while (my ($key,$value) = each(%$hashref)) { 2852: if ($regexp eq '.') { 2853: $count++; 2854: if (defined($range) && $count >= $end) { last; } 2855: if (defined($range) && $count < $start) { next; } 2856: $qresult.=$key.'='.$value.'&'; 2857: } else { 2858: my $unescapeKey = &unescape($key); 2859: if (eval('$unescapeKey=~/$regexp/')) { 2860: $count++; 2861: if (defined($range) && $count >= $end) { last; } 2862: if (defined($range) && $count < $start) { next; } 2863: $qresult.="$key=$value&"; 2864: } 2865: } 2866: } 2867: if (&untie_user_hash($hashref)) { 2868: chop($qresult); 2869: &Reply($client, "$qresult\n", $userinput); 2870: } else { 2871: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 2872: "while attempting dump\n", $userinput); 2873: } 2874: } else { 2875: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 2876: "while attempting dump\n", $userinput); 2877: } 2878: 2879: return 1; 2880: } 2881: &register_handler("dump", \&dump_with_regexp, 0, 1, 0); 2882: 2883: # Store a set of key=value pairs associated with a versioned name. 2884: # 2885: # Parameters: 2886: # $cmd - Request command keyword. 2887: # $tail - Tail of the request. This is a colon 2888: # separated list containing: 2889: # domain/user - User and authentication domain. 2890: # namespace - Name of the database being modified 2891: # rid - Resource keyword to modify. 2892: # what - new value associated with rid. 2893: # 2894: # $client - Socket open on the client. 2895: # 2896: # 2897: # Returns: 2898: # 1 (keep on processing). 2899: # Side-Effects: 2900: # Writes to the client 2901: sub store_handler { 2902: my ($cmd, $tail, $client) = @_; 2903: 2904: my $userinput = "$cmd:$tail"; 2905: 2906: my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail); 2907: if ($namespace ne 'roles') { 2908: 2909: chomp($what); 2910: my @pairs=split(/\&/,$what); 2911: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2912: &GDBM_WRCREAT(), "S", 2913: "$rid:$what"); 2914: if ($hashref) { 2915: my $now = time; 2916: my @previouskeys=split(/&/,$hashref->{"keys:$rid"}); 2917: my $key; 2918: $hashref->{"version:$rid"}++; 2919: my $version=$hashref->{"version:$rid"}; 2920: my $allkeys=''; 2921: foreach my $pair (@pairs) { 2922: my ($key,$value)=split(/=/,$pair); 2923: $allkeys.=$key.':'; 2924: $hashref->{"$version:$rid:$key"}=$value; 2925: } 2926: $hashref->{"$version:$rid:timestamp"}=$now; 2927: $allkeys.='timestamp'; 2928: $hashref->{"$version:keys:$rid"}=$allkeys; 2929: if (&untie_user_hash($hashref)) { 2930: &Reply($client, "ok\n", $userinput); 2931: } else { 2932: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2933: "while attempting store\n", $userinput); 2934: } 2935: } else { 2936: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2937: "while attempting store\n", $userinput); 2938: } 2939: } else { 2940: &Failure($client, "refused\n", $userinput); 2941: } 2942: 2943: return 1; 2944: } 2945: &register_handler("store", \&store_handler, 0, 1, 0); 2946: 2947: # Modify a set of key=value pairs associated with a versioned name. 2948: # 2949: # Parameters: 2950: # $cmd - Request command keyword. 2951: # $tail - Tail of the request. This is a colon 2952: # separated list containing: 2953: # domain/user - User and authentication domain. 2954: # namespace - Name of the database being modified 2955: # rid - Resource keyword to modify. 2956: # v - Version item to modify 2957: # what - new value associated with rid. 2958: # 2959: # $client - Socket open on the client. 2960: # 2961: # 2962: # Returns: 2963: # 1 (keep on processing). 2964: # Side-Effects: 2965: # Writes to the client 2966: sub putstore_handler { 2967: my ($cmd, $tail, $client) = @_; 2968: 2969: my $userinput = "$cmd:$tail"; 2970: 2971: my ($udom,$uname,$namespace,$rid,$v,$what) =split(/:/,$tail); 2972: if ($namespace ne 'roles') { 2973: 2974: chomp($what); 2975: my $hashref = &tie_user_hash($udom, $uname, $namespace, 2976: &GDBM_WRCREAT(), "M", 2977: "$rid:$v:$what"); 2978: if ($hashref) { 2979: my $now = time; 2980: my %data = &hash_extract($what); 2981: my @allkeys; 2982: while (my($key,$value) = each(%data)) { 2983: push(@allkeys,$key); 2984: $hashref->{"$v:$rid:$key"} = $value; 2985: } 2986: my $allkeys = join(':',@allkeys); 2987: $hashref->{"$v:keys:$rid"}=$allkeys; 2988: 2989: if (&untie_user_hash($hashref)) { 2990: &Reply($client, "ok\n", $userinput); 2991: } else { 2992: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 2993: "while attempting store\n", $userinput); 2994: } 2995: } else { 2996: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 2997: "while attempting store\n", $userinput); 2998: } 2999: } else { 3000: &Failure($client, "refused\n", $userinput); 3001: } 3002: 3003: return 1; 3004: } 3005: &register_handler("putstore", \&putstore_handler, 0, 1, 0); 3006: 3007: sub hash_extract { 3008: my ($str)=@_; 3009: my %hash; 3010: foreach my $pair (split(/\&/,$str)) { 3011: my ($key,$value)=split(/=/,$pair); 3012: $hash{$key}=$value; 3013: } 3014: return (%hash); 3015: } 3016: sub hash_to_str { 3017: my ($hash_ref)=@_; 3018: my $str; 3019: foreach my $key (keys(%$hash_ref)) { 3020: $str.=$key.'='.$hash_ref->{$key}.'&'; 3021: } 3022: $str=~s/\&$//; 3023: return $str; 3024: } 3025: 3026: # 3027: # Dump out all versions of a resource that has key=value pairs associated 3028: # with it for each version. These resources are built up via the store 3029: # command. 3030: # 3031: # Parameters: 3032: # $cmd - Command keyword. 3033: # $tail - Remainder of the request which consists of: 3034: # domain/user - User and auth. domain. 3035: # namespace - name of resource database. 3036: # rid - Resource id. 3037: # $client - socket open on the client. 3038: # 3039: # Returns: 3040: # 1 indicating the caller should not yet exit. 3041: # Side-effects: 3042: # Writes a reply to the client. 3043: # The reply is a string of the following shape: 3044: # version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2... 3045: # Where the 1 above represents version 1. 3046: # this continues for all pairs of keys in all versions. 3047: # 3048: # 3049: # 3050: # 3051: sub restore_handler { 3052: my ($cmd, $tail, $client) = @_; 3053: 3054: my $userinput = "$cmd:$tail"; # Only used for logging purposes. 3055: my ($udom,$uname,$namespace,$rid) = split(/:/,$tail); 3056: $namespace=~s/\//\_/g; 3057: $namespace = &LONCAPA::clean_username($namespace); 3058: 3059: chomp($rid); 3060: my $qresult=''; 3061: my $hashref = &tie_user_hash($udom, $uname, $namespace, &GDBM_READER()); 3062: if ($hashref) { 3063: my $version=$hashref->{"version:$rid"}; 3064: $qresult.="version=$version&"; 3065: my $scope; 3066: for ($scope=1;$scope<=$version;$scope++) { 3067: my $vkeys=$hashref->{"$scope:keys:$rid"}; 3068: my @keys=split(/:/,$vkeys); 3069: my $key; 3070: $qresult.="$scope:keys=$vkeys&"; 3071: foreach $key (@keys) { 3072: $qresult.="$scope:$key=".$hashref->{"$scope:$rid:$key"}."&"; 3073: } 3074: } 3075: if (&untie_user_hash($hashref)) { 3076: $qresult=~s/\&$//; 3077: &Reply( $client, "$qresult\n", $userinput); 3078: } else { 3079: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 3080: "while attempting restore\n", $userinput); 3081: } 3082: } else { 3083: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 3084: "while attempting restore\n", $userinput); 3085: } 3086: 3087: return 1; 3088: 3089: 3090: } 3091: &register_handler("restore", \&restore_handler, 0,1,0); 3092: 3093: # 3094: # Add a chat message to a synchronous discussion board. 3095: # 3096: # Parameters: 3097: # $cmd - Request keyword. 3098: # $tail - Tail of the command. A colon separated list 3099: # containing: 3100: # cdom - Domain on which the chat board lives 3101: # cnum - Course containing the chat board. 3102: # newpost - Body of the posting. 3103: # group - Optional group, if chat board is only 3104: # accessible in a group within the course 3105: # $client - Socket open on the client. 3106: # Returns: 3107: # 1 - Indicating caller should keep on processing. 3108: # 3109: # Side-effects: 3110: # writes a reply to the client. 3111: # 3112: # 3113: sub send_chat_handler { 3114: my ($cmd, $tail, $client) = @_; 3115: 3116: 3117: my $userinput = "$cmd:$tail"; 3118: 3119: my ($cdom,$cnum,$newpost,$group)=split(/\:/,$tail); 3120: &chat_add($cdom,$cnum,$newpost,$group); 3121: &Reply($client, "ok\n", $userinput); 3122: 3123: return 1; 3124: } 3125: &register_handler("chatsend", \&send_chat_handler, 0, 1, 0); 3126: 3127: # 3128: # Retrieve the set of chat messages from a discussion board. 3129: # 3130: # Parameters: 3131: # $cmd - Command keyword that initiated the request. 3132: # $tail - Remainder of the request after the command 3133: # keyword. In this case a colon separated list of 3134: # chat domain - Which discussion board. 3135: # chat id - Discussion thread(?) 3136: # domain/user - Authentication domain and username 3137: # of the requesting person. 3138: # group - Optional course group containing 3139: # the board. 3140: # $client - Socket open on the client program. 3141: # Returns: 3142: # 1 - continue processing 3143: # Side effects: 3144: # Response is written to the client. 3145: # 3146: sub retrieve_chat_handler { 3147: my ($cmd, $tail, $client) = @_; 3148: 3149: 3150: my $userinput = "$cmd:$tail"; 3151: 3152: my ($cdom,$cnum,$udom,$uname,$group)=split(/\:/,$tail); 3153: my $reply=''; 3154: foreach (&get_chat($cdom,$cnum,$udom,$uname,$group)) { 3155: $reply.=&escape($_).':'; 3156: } 3157: $reply=~s/\:$//; 3158: &Reply($client, $reply."\n", $userinput); 3159: 3160: 3161: return 1; 3162: } 3163: &register_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0); 3164: 3165: # 3166: # Initiate a query of an sql database. SQL query repsonses get put in 3167: # a file for later retrieval. This prevents sql query results from 3168: # bottlenecking the system. Note that with loncnew, perhaps this is 3169: # less of an issue since multiple outstanding requests can be concurrently 3170: # serviced. 3171: # 3172: # Parameters: 3173: # $cmd - COmmand keyword that initiated the request. 3174: # $tail - Remainder of the command after the keyword. 3175: # For this function, this consists of a query and 3176: # 3 arguments that are self-documentingly labelled 3177: # in the original arg1, arg2, arg3. 3178: # $client - Socket open on the client. 3179: # Return: 3180: # 1 - Indicating processing should continue. 3181: # Side-effects: 3182: # a reply is written to $client. 3183: # 3184: sub send_query_handler { 3185: my ($cmd, $tail, $client) = @_; 3186: 3187: 3188: my $userinput = "$cmd:$tail"; 3189: 3190: my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail); 3191: $query=~s/\n*$//g; 3192: &Reply($client, "". &sql_reply("$clientname\&$query". 3193: "\&$arg1"."\&$arg2"."\&$arg3")."\n", 3194: $userinput); 3195: 3196: return 1; 3197: } 3198: &register_handler("querysend", \&send_query_handler, 0, 1, 0); 3199: 3200: # 3201: # Add a reply to an sql query. SQL queries are done asyncrhonously. 3202: # The query is submitted via a "querysend" transaction. 3203: # There it is passed on to the lonsql daemon, queued and issued to 3204: # mysql. 3205: # This transaction is invoked when the sql transaction is complete 3206: # it stores the query results in flie and indicates query completion. 3207: # presumably local software then fetches this response... I'm guessing 3208: # the sequence is: lonc does a querysend, we ask lonsql to do it. 3209: # lonsql on completion of the query interacts with the lond of our 3210: # client to do a query reply storing two files: 3211: # - id - The results of the query. 3212: # - id.end - Indicating the transaction completed. 3213: # NOTE: id is a unique id assigned to the query and querysend time. 3214: # Parameters: 3215: # $cmd - Command keyword that initiated this request. 3216: # $tail - Remainder of the tail. In this case that's a colon 3217: # separated list containing the query Id and the 3218: # results of the query. 3219: # $client - Socket open on the client. 3220: # Return: 3221: # 1 - Indicating that we should continue processing. 3222: # Side effects: 3223: # ok written to the client. 3224: # 3225: sub reply_query_handler { 3226: my ($cmd, $tail, $client) = @_; 3227: 3228: 3229: my $userinput = "$cmd:$tail"; 3230: 3231: my ($id,$reply)=split(/:/,$tail); 3232: my $store; 3233: my $execdir=$perlvar{'lonDaemons'}; 3234: if ($store=IO::File->new(">$execdir/tmp/$id")) { 3235: $reply=~s/\&/\n/g; 3236: print $store $reply; 3237: close $store; 3238: my $store2=IO::File->new(">$execdir/tmp/$id.end"); 3239: print $store2 "done\n"; 3240: close $store2; 3241: &Reply($client, "ok\n", $userinput); 3242: } else { 3243: &Failure($client, "error: ".($!+0) 3244: ." IO::File->new Failed ". 3245: "while attempting queryreply\n", $userinput); 3246: } 3247: 3248: 3249: return 1; 3250: } 3251: &register_handler("queryreply", \&reply_query_handler, 0, 1, 0); 3252: 3253: # 3254: # Process the courseidput request. Not quite sure what this means 3255: # at the system level sense. It appears a gdbm file in the 3256: # /home/httpd/lonUsers/$domain/nohist_courseids is tied and 3257: # a set of entries made in that database. 3258: # 3259: # Parameters: 3260: # $cmd - The command keyword that initiated this request. 3261: # $tail - Tail of the command. In this case consists of a colon 3262: # separated list contaning the domain to apply this to and 3263: # an ampersand separated list of keyword=value pairs. 3264: # Each value is a colon separated list that includes: 3265: # description, institutional code and course owner. 3266: # For backward compatibility with versions included 3267: # in LON-CAPA 1.1.X (and earlier) and 1.2.X, institutional 3268: # code and/or course owner are preserved from the existing 3269: # record when writing a new record in response to 1.1 or 3270: # 1.2 implementations of lonnet::flushcourselogs(). 3271: # 3272: # $client - Socket open on the client. 3273: # Returns: 3274: # 1 - indicating that processing should continue 3275: # 3276: # Side effects: 3277: # reply is written to the client. 3278: # 3279: sub put_course_id_handler { 3280: my ($cmd, $tail, $client) = @_; 3281: 3282: 3283: my $userinput = "$cmd:$tail"; 3284: 3285: my ($udom, $what) = split(/:/, $tail,2); 3286: chomp($what); 3287: my $now=time; 3288: my @pairs=split(/\&/,$what); 3289: 3290: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT()); 3291: if ($hashref) { 3292: foreach my $pair (@pairs) { 3293: my ($key,$courseinfo) = split(/=/,$pair,2); 3294: $courseinfo =~ s/=/:/g; 3295: my @current_items = split(/:/,$hashref->{$key},-1); 3296: shift(@current_items); # remove description 3297: pop(@current_items); # remove last access 3298: my $numcurrent = scalar(@current_items); 3299: if ($numcurrent > 3) { 3300: $numcurrent = 3; 3301: } 3302: my @new_items = split(/:/,$courseinfo,-1); 3303: my $numnew = scalar(@new_items); 3304: if ($numcurrent > 0) { 3305: if ($numnew <= $numcurrent) { # flushcourselogs() from pre 2.2 3306: for (my $j=$numcurrent-$numnew; $j>=0; $j--) { 3307: $courseinfo .= ':'.$current_items[$numcurrent-$j-1]; 3308: } 3309: } 3310: } 3311: $hashref->{$key}=$courseinfo.':'.$now; 3312: } 3313: if (&untie_domain_hash($hashref)) { 3314: &Reply( $client, "ok\n", $userinput); 3315: } else { 3316: &Failure($client, "error: ".($!+0) 3317: ." untie(GDBM) Failed ". 3318: "while attempting courseidput\n", $userinput); 3319: } 3320: } else { 3321: &Failure($client, "error: ".($!+0) 3322: ." tie(GDBM) Failed ". 3323: "while attempting courseidput\n", $userinput); 3324: } 3325: 3326: 3327: return 1; 3328: } 3329: &register_handler("courseidput", \&put_course_id_handler, 0, 1, 0); 3330: 3331: # Retrieves the value of a course id resource keyword pattern 3332: # defined since a starting date. Both the starting date and the 3333: # keyword pattern are optional. If the starting date is not supplied it 3334: # is treated as the beginning of time. If the pattern is not found, 3335: # it is treatred as "." matching everything. 3336: # 3337: # Parameters: 3338: # $cmd - Command keyword that resulted in us being dispatched. 3339: # $tail - The remainder of the command that, in this case, consists 3340: # of a colon separated list of: 3341: # domain - The domain in which the course database is 3342: # defined. 3343: # since - Optional parameter describing the minimum 3344: # time of definition(?) of the resources that 3345: # will match the dump. 3346: # description - regular expression that is used to filter 3347: # the dump. Only keywords matching this regexp 3348: # will be used. 3349: # institutional code - optional supplied code to filter 3350: # the dump. Only courses with an institutional code 3351: # that match the supplied code will be returned. 3352: # owner - optional supplied username and domain of owner to 3353: # filter the dump. Only courses for which the course 3354: # owner matches the supplied username and/or domain 3355: # will be returned. Pre-2.2.0 legacy entries from 3356: # nohist_courseiddump will only contain usernames. 3357: # $client - The socket open on the client. 3358: # Returns: 3359: # 1 - Continue processing. 3360: # Side Effects: 3361: # a reply is written to $client. 3362: sub dump_course_id_handler { 3363: my ($cmd, $tail, $client) = @_; 3364: 3365: my $userinput = "$cmd:$tail"; 3366: 3367: my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter, 3368: $typefilter,$regexp_ok) =split(/:/,$tail); 3369: if (defined($description)) { 3370: $description=&unescape($description); 3371: } else { 3372: $description='.'; 3373: } 3374: if (defined($instcodefilter)) { 3375: $instcodefilter=&unescape($instcodefilter); 3376: } else { 3377: $instcodefilter='.'; 3378: } 3379: my ($ownerunamefilter,$ownerdomfilter); 3380: if (defined($ownerfilter)) { 3381: $ownerfilter=&unescape($ownerfilter); 3382: if ($ownerfilter ne '.' && defined($ownerfilter)) { 3383: if ($ownerfilter =~ /^([^:]*):([^:]*)$/) { 3384: $ownerunamefilter = $1; 3385: $ownerdomfilter = $2; 3386: } else { 3387: $ownerunamefilter = $ownerfilter; 3388: $ownerdomfilter = ''; 3389: } 3390: } 3391: } else { 3392: $ownerfilter='.'; 3393: } 3394: 3395: if (defined($coursefilter)) { 3396: $coursefilter=&unescape($coursefilter); 3397: } else { 3398: $coursefilter='.'; 3399: } 3400: if (defined($typefilter)) { 3401: $typefilter=&unescape($typefilter); 3402: } else { 3403: $typefilter='.'; 3404: } 3405: if (defined($regexp_ok)) { 3406: $regexp_ok=&unescape($regexp_ok); 3407: } 3408: 3409: unless (defined($since)) { $since=0; } 3410: my $qresult=''; 3411: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT()); 3412: if ($hashref) { 3413: while (my ($key,$value) = each(%$hashref)) { 3414: my ($descr,$lasttime,$inst_code,$owner,$type); 3415: my @courseitems = split(/:/,$value); 3416: $lasttime = pop(@courseitems); 3417: ($descr,$inst_code,$owner,$type)=@courseitems; 3418: if ($lasttime<$since) { next; } 3419: my $match = 1; 3420: unless ($description eq '.') { 3421: my $unescapeDescr = &unescape($descr); 3422: unless (eval('$unescapeDescr=~/\Q$description\E/i')) { 3423: $match = 0; 3424: } 3425: } 3426: unless ($instcodefilter eq '.' || !defined($instcodefilter)) { 3427: my $unescapeInstcode = &unescape($inst_code); 3428: if ($regexp_ok) { 3429: unless (eval('$unescapeInstcode=~/$instcodefilter/')) { 3430: $match = 0; 3431: } 3432: } else { 3433: unless (eval('$unescapeInstcode=~/\Q$instcodefilter\E/i')) { 3434: $match = 0; 3435: } 3436: } 3437: } 3438: unless ($ownerfilter eq '.' || !defined($ownerfilter)) { 3439: my $unescapeOwner = &unescape($owner); 3440: if (($ownerunamefilter ne '') && ($ownerdomfilter ne '')) { 3441: if ($unescapeOwner =~ /:/) { 3442: if (eval('$unescapeOwner !~ 3443: /\Q$ownerunamefilter\E:\Q$ownerdomfilter\E$/i')) { 3444: $match = 0; 3445: } 3446: } else { 3447: if (eval('$unescapeOwner!~/\Q$ownerunamefilter\E/i')) { 3448: $match = 0; 3449: } 3450: } 3451: } elsif ($ownerunamefilter ne '') { 3452: if ($unescapeOwner =~ /:/) { 3453: if (eval('$unescapeOwner!~/\Q$ownerunamefilter\E:[^:]+$/i')) { 3454: $match = 0; 3455: } 3456: } else { 3457: if (eval('$unescapeOwner!~/\Q$ownerunamefilter\E/i')) { 3458: $match = 0; 3459: } 3460: } 3461: } elsif ($ownerdomfilter ne '') { 3462: if ($unescapeOwner =~ /:/) { 3463: if (eval('$unescapeOwner!~/^[^:]+:\Q$ownerdomfilter\E/')) { 3464: $match = 0; 3465: } 3466: } else { 3467: if ($ownerdomfilter ne $udom) { 3468: $match = 0; 3469: } 3470: } 3471: } 3472: } 3473: unless ($coursefilter eq '.' || !defined($coursefilter)) { 3474: my $unescapeCourse = &unescape($key); 3475: unless (eval('$unescapeCourse=~/^$udom(_)\Q$coursefilter\E$/')) { 3476: $match = 0; 3477: } 3478: } 3479: unless ($typefilter eq '.' || !defined($typefilter)) { 3480: my $unescapeType = &unescape($type); 3481: if ($type eq '') { 3482: if ($typefilter ne 'Course') { 3483: $match = 0; 3484: } 3485: } else { 3486: unless (eval('$unescapeType=~/^\Q$typefilter\E$/')) { 3487: $match = 0; 3488: } 3489: } 3490: } 3491: if ($match == 1) { 3492: $qresult.=$key.'='.$descr.':'.$inst_code.':'.$owner.'&'; 3493: } 3494: } 3495: if (&untie_domain_hash($hashref)) { 3496: chop($qresult); 3497: &Reply($client, "$qresult\n", $userinput); 3498: } else { 3499: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 3500: "while attempting courseiddump\n", $userinput); 3501: } 3502: } else { 3503: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 3504: "while attempting courseiddump\n", $userinput); 3505: } 3506: 3507: 3508: return 1; 3509: } 3510: &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0); 3511: 3512: # 3513: # Puts an unencrypted entry in a namespace db file at the domain level 3514: # 3515: # Parameters: 3516: # $cmd - The command that got us here. 3517: # $tail - Tail of the command (remaining parameters). 3518: # $client - File descriptor connected to client. 3519: # Returns 3520: # 0 - Requested to exit, caller should shut down. 3521: # 1 - Continue processing. 3522: # Side effects: 3523: # reply is written to $client. 3524: # 3525: sub put_domain_handler { 3526: my ($cmd,$tail,$client) = @_; 3527: 3528: my $userinput = "$cmd:$tail"; 3529: 3530: my ($udom,$namespace,$what) =split(/:/,$tail,3); 3531: chomp($what); 3532: my @pairs=split(/\&/,$what); 3533: my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_WRCREAT(), 3534: "P", $what); 3535: if ($hashref) { 3536: foreach my $pair (@pairs) { 3537: my ($key,$value)=split(/=/,$pair); 3538: $hashref->{$key}=$value; 3539: } 3540: if (&untie_domain_hash($hashref)) { 3541: &Reply($client, "ok\n", $userinput); 3542: } else { 3543: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 3544: "while attempting putdom\n", $userinput); 3545: } 3546: } else { 3547: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 3548: "while attempting putdom\n", $userinput); 3549: } 3550: 3551: return 1; 3552: } 3553: &register_handler("putdom", \&put_domain_handler, 0, 1, 0); 3554: 3555: # Unencrypted get from the namespace database file at the domain level. 3556: # This function retrieves a keyed item from a specific named database in the 3557: # domain directory. 3558: # 3559: # Parameters: 3560: # $cmd - Command request keyword (get). 3561: # $tail - Tail of the command. This is a colon separated list 3562: # consisting of the domain and the 'namespace' 3563: # which selects the gdbm file to do the lookup in, 3564: # & separated list of keys to lookup. Note that 3565: # the values are returned as an & separated list too. 3566: # $client - File descriptor open on the client. 3567: # Returns: 3568: # 1 - Continue processing. 3569: # 0 - Exit. 3570: # Side effects: 3571: # reply is written to $client. 3572: # 3573: 3574: sub get_domain_handler { 3575: my ($cmd, $tail, $client) = @_; 3576: 3577: my $userinput = "$client:$tail"; 3578: 3579: my ($udom,$namespace,$what)=split(/:/,$tail,3); 3580: chomp($what); 3581: my @queries=split(/\&/,$what); 3582: my $qresult=''; 3583: my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_READER()); 3584: if ($hashref) { 3585: for (my $i=0;$i<=$#queries;$i++) { 3586: $qresult.="$hashref->{$queries[$i]}&"; 3587: } 3588: if (&untie_domain_hash($hashref)) { 3589: $qresult=~s/\&$//; 3590: &Reply($client, "$qresult\n", $userinput); 3591: } else { 3592: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 3593: "while attempting getdom\n",$userinput); 3594: } 3595: } else { 3596: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 3597: "while attempting getdom\n",$userinput); 3598: } 3599: 3600: return 1; 3601: } 3602: &register_handler("getdom", \&get_domain_handler, 0, 1, 0); 3603: 3604: 3605: # 3606: # Puts an id to a domains id database. 3607: # 3608: # Parameters: 3609: # $cmd - The command that triggered us. 3610: # $tail - Remainder of the request other than the command. This is a 3611: # colon separated list containing: 3612: # $domain - The domain for which we are writing the id. 3613: # $pairs - The id info to write... this is and & separated list 3614: # of keyword=value. 3615: # $client - Socket open on the client. 3616: # Returns: 3617: # 1 - Continue processing. 3618: # Side effects: 3619: # reply is written to $client. 3620: # 3621: sub put_id_handler { 3622: my ($cmd,$tail,$client) = @_; 3623: 3624: 3625: my $userinput = "$cmd:$tail"; 3626: 3627: my ($udom,$what)=split(/:/,$tail); 3628: chomp($what); 3629: my @pairs=split(/\&/,$what); 3630: my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(), 3631: "P", $what); 3632: if ($hashref) { 3633: foreach my $pair (@pairs) { 3634: my ($key,$value)=split(/=/,$pair); 3635: $hashref->{$key}=$value; 3636: } 3637: if (&untie_domain_hash($hashref)) { 3638: &Reply($client, "ok\n", $userinput); 3639: } else { 3640: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 3641: "while attempting idput\n", $userinput); 3642: } 3643: } else { 3644: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 3645: "while attempting idput\n", $userinput); 3646: } 3647: 3648: return 1; 3649: } 3650: &register_handler("idput", \&put_id_handler, 0, 1, 0); 3651: 3652: # 3653: # Retrieves a set of id values from the id database. 3654: # Returns an & separated list of results, one for each requested id to the 3655: # client. 3656: # 3657: # Parameters: 3658: # $cmd - Command keyword that caused us to be dispatched. 3659: # $tail - Tail of the command. Consists of a colon separated: 3660: # domain - the domain whose id table we dump 3661: # ids Consists of an & separated list of 3662: # id keywords whose values will be fetched. 3663: # nonexisting keywords will have an empty value. 3664: # $client - Socket open on the client. 3665: # 3666: # Returns: 3667: # 1 - indicating processing should continue. 3668: # Side effects: 3669: # An & separated list of results is written to $client. 3670: # 3671: sub get_id_handler { 3672: my ($cmd, $tail, $client) = @_; 3673: 3674: 3675: my $userinput = "$client:$tail"; 3676: 3677: my ($udom,$what)=split(/:/,$tail); 3678: chomp($what); 3679: my @queries=split(/\&/,$what); 3680: my $qresult=''; 3681: my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER()); 3682: if ($hashref) { 3683: for (my $i=0;$i<=$#queries;$i++) { 3684: $qresult.="$hashref->{$queries[$i]}&"; 3685: } 3686: if (&untie_domain_hash($hashref)) { 3687: $qresult=~s/\&$//; 3688: &Reply($client, "$qresult\n", $userinput); 3689: } else { 3690: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ". 3691: "while attempting idget\n",$userinput); 3692: } 3693: } else { 3694: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 3695: "while attempting idget\n",$userinput); 3696: } 3697: 3698: return 1; 3699: } 3700: &register_handler("idget", \&get_id_handler, 0, 1, 0); 3701: 3702: # 3703: # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database 3704: # 3705: # Parameters 3706: # $cmd - Command keyword that caused us to be dispatched. 3707: # $tail - Tail of the command. Consists of a colon separated: 3708: # domain - the domain whose dcmail we are recording 3709: # email Consists of key=value pair 3710: # where key is unique msgid 3711: # and value is message (in XML) 3712: # $client - Socket open on the client. 3713: # 3714: # Returns: 3715: # 1 - indicating processing should continue. 3716: # Side effects 3717: # reply is written to $client. 3718: # 3719: sub put_dcmail_handler { 3720: my ($cmd,$tail,$client) = @_; 3721: my $userinput = "$cmd:$tail"; 3722: 3723: my ($udom,$what)=split(/:/,$tail); 3724: chomp($what); 3725: my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT()); 3726: if ($hashref) { 3727: my ($key,$value)=split(/=/,$what); 3728: $hashref->{$key}=$value; 3729: } 3730: if (&untie_domain_hash($hashref)) { 3731: &Reply($client, "ok\n", $userinput); 3732: } else { 3733: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 3734: "while attempting dcmailput\n", $userinput); 3735: } 3736: return 1; 3737: } 3738: &register_handler("dcmailput", \&put_dcmail_handler, 0, 1, 0); 3739: 3740: # 3741: # Retrieves broadcast e-mail from nohist_dcmail database 3742: # Returns to client an & separated list of key=value pairs, 3743: # where key is msgid and value is message information. 3744: # 3745: # Parameters 3746: # $cmd - Command keyword that caused us to be dispatched. 3747: # $tail - Tail of the command. Consists of a colon separated: 3748: # domain - the domain whose dcmail table we dump 3749: # startfilter - beginning of time window 3750: # endfilter - end of time window 3751: # sendersfilter - & separated list of username:domain 3752: # for senders to search for. 3753: # $client - Socket open on the client. 3754: # 3755: # Returns: 3756: # 1 - indicating processing should continue. 3757: # Side effects 3758: # reply (& separated list of msgid=messageinfo pairs) is 3759: # written to $client. 3760: # 3761: sub dump_dcmail_handler { 3762: my ($cmd, $tail, $client) = @_; 3763: 3764: my $userinput = "$cmd:$tail"; 3765: my ($udom,$startfilter,$endfilter,$sendersfilter) = split(/:/,$tail); 3766: chomp($sendersfilter); 3767: my @senders = (); 3768: if (defined($startfilter)) { 3769: $startfilter=&unescape($startfilter); 3770: } else { 3771: $startfilter='.'; 3772: } 3773: if (defined($endfilter)) { 3774: $endfilter=&unescape($endfilter); 3775: } else { 3776: $endfilter='.'; 3777: } 3778: if (defined($sendersfilter)) { 3779: $sendersfilter=&unescape($sendersfilter); 3780: @senders = map { &unescape($_) } split(/\&/,$sendersfilter); 3781: } 3782: 3783: my $qresult=''; 3784: my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT()); 3785: if ($hashref) { 3786: while (my ($key,$value) = each(%$hashref)) { 3787: my $match = 1; 3788: my ($timestamp,$subj,$uname,$udom) = 3789: split(/:/,&unescape(&unescape($key)),5); # yes, twice really 3790: $subj = &unescape($subj); 3791: unless ($startfilter eq '.' || !defined($startfilter)) { 3792: if ($timestamp < $startfilter) { 3793: $match = 0; 3794: } 3795: } 3796: unless ($endfilter eq '.' || !defined($endfilter)) { 3797: if ($timestamp > $endfilter) { 3798: $match = 0; 3799: } 3800: } 3801: unless (@senders < 1) { 3802: unless (grep/^$uname:$udom$/,@senders) { 3803: $match = 0; 3804: } 3805: } 3806: if ($match == 1) { 3807: $qresult.=$key.'='.$value.'&'; 3808: } 3809: } 3810: if (&untie_domain_hash($hashref)) { 3811: chop($qresult); 3812: &Reply($client, "$qresult\n", $userinput); 3813: } else { 3814: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 3815: "while attempting dcmaildump\n", $userinput); 3816: } 3817: } else { 3818: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 3819: "while attempting dcmaildump\n", $userinput); 3820: } 3821: return 1; 3822: } 3823: 3824: &register_handler("dcmaildump", \&dump_dcmail_handler, 0, 1, 0); 3825: 3826: # 3827: # Puts domain roles in nohist_domainroles database 3828: # 3829: # Parameters 3830: # $cmd - Command keyword that caused us to be dispatched. 3831: # $tail - Tail of the command. Consists of a colon separated: 3832: # domain - the domain whose roles we are recording 3833: # role - Consists of key=value pair 3834: # where key is unique role 3835: # and value is start/end date information 3836: # $client - Socket open on the client. 3837: # 3838: # Returns: 3839: # 1 - indicating processing should continue. 3840: # Side effects 3841: # reply is written to $client. 3842: # 3843: 3844: sub put_domainroles_handler { 3845: my ($cmd,$tail,$client) = @_; 3846: 3847: my $userinput = "$cmd:$tail"; 3848: my ($udom,$what)=split(/:/,$tail); 3849: chomp($what); 3850: my @pairs=split(/\&/,$what); 3851: my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT()); 3852: if ($hashref) { 3853: foreach my $pair (@pairs) { 3854: my ($key,$value)=split(/=/,$pair); 3855: $hashref->{$key}=$value; 3856: } 3857: if (&untie_domain_hash($hashref)) { 3858: &Reply($client, "ok\n", $userinput); 3859: } else { 3860: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 3861: "while attempting domroleput\n", $userinput); 3862: } 3863: } else { 3864: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ". 3865: "while attempting domroleput\n", $userinput); 3866: } 3867: 3868: return 1; 3869: } 3870: 3871: &register_handler("domroleput", \&put_domainroles_handler, 0, 1, 0); 3872: 3873: # 3874: # Retrieves domain roles from nohist_domainroles database 3875: # Returns to client an & separated list of key=value pairs, 3876: # where key is role and value is start and end date information. 3877: # 3878: # Parameters 3879: # $cmd - Command keyword that caused us to be dispatched. 3880: # $tail - Tail of the command. Consists of a colon separated: 3881: # domain - the domain whose domain roles table we dump 3882: # $client - Socket open on the client. 3883: # 3884: # Returns: 3885: # 1 - indicating processing should continue. 3886: # Side effects 3887: # reply (& separated list of role=start/end info pairs) is 3888: # written to $client. 3889: # 3890: sub dump_domainroles_handler { 3891: my ($cmd, $tail, $client) = @_; 3892: 3893: my $userinput = "$cmd:$tail"; 3894: my ($udom,$startfilter,$endfilter,$rolesfilter) = split(/:/,$tail); 3895: chomp($rolesfilter); 3896: my @roles = (); 3897: if (defined($startfilter)) { 3898: $startfilter=&unescape($startfilter); 3899: } else { 3900: $startfilter='.'; 3901: } 3902: if (defined($endfilter)) { 3903: $endfilter=&unescape($endfilter); 3904: } else { 3905: $endfilter='.'; 3906: } 3907: if (defined($rolesfilter)) { 3908: $rolesfilter=&unescape($rolesfilter); 3909: @roles = split(/\&/,$rolesfilter); 3910: } 3911: 3912: my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT()); 3913: if ($hashref) { 3914: my $qresult = ''; 3915: while (my ($key,$value) = each(%$hashref)) { 3916: my $match = 1; 3917: my ($start,$end) = split(/:/,&unescape($value)); 3918: my ($trole,$uname,$udom,$runame,$rudom,$rsec) = split(/:/,&unescape($key)); 3919: unless ($startfilter eq '.' || !defined($startfilter)) { 3920: if ($start >= $startfilter) { 3921: $match = 0; 3922: } 3923: } 3924: unless ($endfilter eq '.' || !defined($endfilter)) { 3925: if ($end <= $endfilter) { 3926: $match = 0; 3927: } 3928: } 3929: unless (@roles < 1) { 3930: unless (grep/^$trole$/,@roles) { 3931: $match = 0; 3932: } 3933: } 3934: if ($match == 1) { 3935: $qresult.=$key.'='.$value.'&'; 3936: } 3937: } 3938: if (&untie_domain_hash($hashref)) { 3939: chop($qresult); 3940: &Reply($client, "$qresult\n", $userinput); 3941: } else { 3942: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ". 3943: "while attempting domrolesdump\n", $userinput); 3944: } 3945: } else { 3946: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ". 3947: "while attempting domrolesdump\n", $userinput); 3948: } 3949: return 1; 3950: } 3951: 3952: &register_handler("domrolesdump", \&dump_domainroles_handler, 0, 1, 0); 3953: 3954: 3955: # Process the tmpput command I'm not sure what this does.. Seems to 3956: # create a file in the lonDaemons/tmp directory of the form $id.tmp 3957: # where Id is the client's ip concatenated with a sequence number. 3958: # The file will contain some value that is passed in. Is this e.g. 3959: # a login token? 3960: # 3961: # Parameters: 3962: # $cmd - The command that got us dispatched. 3963: # $tail - The remainder of the request following $cmd: 3964: # In this case this will be the contents of the file. 3965: # $client - Socket connected to the client. 3966: # Returns: 3967: # 1 indicating processing can continue. 3968: # Side effects: 3969: # A file is created in the local filesystem. 3970: # A reply is sent to the client. 3971: sub tmp_put_handler { 3972: my ($cmd, $what, $client) = @_; 3973: 3974: my $userinput = "$cmd:$what"; # Reconstruct for logging. 3975: 3976: my ($record,$context) = split(/:/,$what); 3977: if ($context ne '') { 3978: chomp($context); 3979: $context = &unescape($context); 3980: } 3981: my ($id,$store); 3982: $tmpsnum++; 3983: if ($context eq 'resetpw') { 3984: $id = &md5_hex(&md5_hex(time.{}.rand().$$)); 3985: } else { 3986: $id = $$.'_'.$clientip.'_'.$tmpsnum; 3987: } 3988: $id=~s/\W/\_/g; 3989: $record=~s/\n//g; 3990: my $execdir=$perlvar{'lonDaemons'}; 3991: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) { 3992: print $store $record; 3993: close $store; 3994: &Reply($client, "$id\n", $userinput); 3995: } else { 3996: &Failure( $client, "error: ".($!+0)."IO::File->new Failed ". 3997: "while attempting tmpput\n", $userinput); 3998: } 3999: return 1; 4000: 4001: } 4002: &register_handler("tmpput", \&tmp_put_handler, 0, 1, 0); 4003: 4004: # Processes the tmpget command. This command returns the contents 4005: # of a temporary resource file(?) created via tmpput. 4006: # 4007: # Paramters: 4008: # $cmd - Command that got us dispatched. 4009: # $id - Tail of the command, contain the id of the resource 4010: # we want to fetch. 4011: # $client - socket open on the client. 4012: # Return: 4013: # 1 - Inidcating processing can continue. 4014: # Side effects: 4015: # A reply is sent to the client. 4016: # 4017: sub tmp_get_handler { 4018: my ($cmd, $id, $client) = @_; 4019: 4020: my $userinput = "$cmd:$id"; 4021: 4022: 4023: $id=~s/\W/\_/g; 4024: my $store; 4025: my $execdir=$perlvar{'lonDaemons'}; 4026: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) { 4027: my $reply=<$store>; 4028: &Reply( $client, "$reply\n", $userinput); 4029: close $store; 4030: } else { 4031: &Failure( $client, "error: ".($!+0)."IO::File->new Failed ". 4032: "while attempting tmpget\n", $userinput); 4033: } 4034: 4035: return 1; 4036: } 4037: &register_handler("tmpget", \&tmp_get_handler, 0, 1, 0); 4038: 4039: # 4040: # Process the tmpdel command. This command deletes a temp resource 4041: # created by the tmpput command. 4042: # 4043: # Parameters: 4044: # $cmd - Command that got us here. 4045: # $id - Id of the temporary resource created. 4046: # $client - socket open on the client process. 4047: # 4048: # Returns: 4049: # 1 - Indicating processing should continue. 4050: # Side Effects: 4051: # A file is deleted 4052: # A reply is sent to the client. 4053: sub tmp_del_handler { 4054: my ($cmd, $id, $client) = @_; 4055: 4056: my $userinput= "$cmd:$id"; 4057: 4058: chomp($id); 4059: $id=~s/\W/\_/g; 4060: my $execdir=$perlvar{'lonDaemons'}; 4061: if (unlink("$execdir/tmp/$id.tmp")) { 4062: &Reply($client, "ok\n", $userinput); 4063: } else { 4064: &Failure( $client, "error: ".($!+0)."Unlink tmp Failed ". 4065: "while attempting tmpdel\n", $userinput); 4066: } 4067: 4068: return 1; 4069: 4070: } 4071: &register_handler("tmpdel", \&tmp_del_handler, 0, 1, 0); 4072: 4073: # 4074: # Processes the setannounce command. This command 4075: # creates a file named announce.txt in the top directory of 4076: # the documentn root and sets its contents. The announce.txt file is 4077: # printed in its entirety at the LonCAPA login page. Note: 4078: # once the announcement.txt fileis created it cannot be deleted. 4079: # However, setting the contents of the file to empty removes the 4080: # announcement from the login page of loncapa so who cares. 4081: # 4082: # Parameters: 4083: # $cmd - The command that got us dispatched. 4084: # $announcement - The text of the announcement. 4085: # $client - Socket open on the client process. 4086: # Retunrns: 4087: # 1 - Indicating request processing should continue 4088: # Side Effects: 4089: # The file {DocRoot}/announcement.txt is created. 4090: # A reply is sent to $client. 4091: # 4092: sub set_announce_handler { 4093: my ($cmd, $announcement, $client) = @_; 4094: 4095: my $userinput = "$cmd:$announcement"; 4096: 4097: chomp($announcement); 4098: $announcement=&unescape($announcement); 4099: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}. 4100: '/announcement.txt')) { 4101: print $store $announcement; 4102: close $store; 4103: &Reply($client, "ok\n", $userinput); 4104: } else { 4105: &Failure($client, "error: ".($!+0)."\n", $userinput); 4106: } 4107: 4108: return 1; 4109: } 4110: &register_handler("setannounce", \&set_announce_handler, 0, 1, 0); 4111: 4112: # 4113: # Return the version of the daemon. This can be used to determine 4114: # the compatibility of cross version installations or, alternatively to 4115: # simply know who's out of date and who isn't. Note that the version 4116: # is returned concatenated with the tail. 4117: # Parameters: 4118: # $cmd - the request that dispatched to us. 4119: # $tail - Tail of the request (client's version?). 4120: # $client - Socket open on the client. 4121: #Returns: 4122: # 1 - continue processing requests. 4123: # Side Effects: 4124: # Replies with version to $client. 4125: sub get_version_handler { 4126: my ($cmd, $tail, $client) = @_; 4127: 4128: my $userinput = $cmd.$tail; 4129: 4130: &Reply($client, &version($userinput)."\n", $userinput); 4131: 4132: 4133: return 1; 4134: } 4135: &register_handler("version", \&get_version_handler, 0, 1, 0); 4136: 4137: # Set the current host and domain. This is used to support 4138: # multihomed systems. Each IP of the system, or even separate daemons 4139: # on the same IP can be treated as handling a separate lonCAPA virtual 4140: # machine. This command selects the virtual lonCAPA. The client always 4141: # knows the right one since it is lonc and it is selecting the domain/system 4142: # from the hosts.tab file. 4143: # Parameters: 4144: # $cmd - Command that dispatched us. 4145: # $tail - Tail of the command (domain/host requested). 4146: # $socket - Socket open on the client. 4147: # 4148: # Returns: 4149: # 1 - Indicates the program should continue to process requests. 4150: # Side-effects: 4151: # The default domain/system context is modified for this daemon. 4152: # a reply is sent to the client. 4153: # 4154: sub set_virtual_host_handler { 4155: my ($cmd, $tail, $socket) = @_; 4156: 4157: my $userinput ="$cmd:$tail"; 4158: 4159: &Reply($client, &sethost($userinput)."\n", $userinput); 4160: 4161: 4162: return 1; 4163: } 4164: &register_handler("sethost", \&set_virtual_host_handler, 0, 1, 0); 4165: 4166: # Process a request to exit: 4167: # - "bye" is sent to the client. 4168: # - The client socket is shutdown and closed. 4169: # - We indicate to the caller that we should exit. 4170: # Formal Parameters: 4171: # $cmd - The command that got us here. 4172: # $tail - Tail of the command (empty). 4173: # $client - Socket open on the tail. 4174: # Returns: 4175: # 0 - Indicating the program should exit!! 4176: # 4177: sub exit_handler { 4178: my ($cmd, $tail, $client) = @_; 4179: 4180: my $userinput = "$cmd:$tail"; 4181: 4182: &logthis("Client $clientip ($clientname) hanging up: $userinput"); 4183: &Reply($client, "bye\n", $userinput); 4184: $client->shutdown(2); # shutdown the socket forcibly. 4185: $client->close(); 4186: 4187: return 0; 4188: } 4189: &register_handler("exit", \&exit_handler, 0,1,1); 4190: &register_handler("init", \&exit_handler, 0,1,1); 4191: &register_handler("quit", \&exit_handler, 0,1,1); 4192: 4193: # Determine if auto-enrollment is enabled. 4194: # Note that the original had what I believe to be a defect. 4195: # The original returned 0 if the requestor was not a registerd client. 4196: # It should return "refused". 4197: # Formal Parameters: 4198: # $cmd - The command that invoked us. 4199: # $tail - The tail of the command (Extra command parameters. 4200: # $client - The socket open on the client that issued the request. 4201: # Returns: 4202: # 1 - Indicating processing should continue. 4203: # 4204: sub enrollment_enabled_handler { 4205: my ($cmd, $tail, $client) = @_; 4206: my $userinput = $cmd.":".$tail; # For logging purposes. 4207: 4208: 4209: my ($cdom) = split(/:/, $tail, 2); # Domain we're asking about. 4210: 4211: my $outcome = &localenroll::run($cdom); 4212: &Reply($client, "$outcome\n", $userinput); 4213: 4214: return 1; 4215: } 4216: &register_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0); 4217: 4218: # Get the official sections for which auto-enrollment is possible. 4219: # Since the admin people won't know about 'unofficial sections' 4220: # we cannot auto-enroll on them. 4221: # Formal Parameters: 4222: # $cmd - The command request that got us dispatched here. 4223: # $tail - The remainder of the request. In our case this 4224: # will be split into: 4225: # $coursecode - The course name from the admin point of view. 4226: # $cdom - The course's domain(?). 4227: # $client - Socket open on the client. 4228: # Returns: 4229: # 1 - Indiciting processing should continue. 4230: # 4231: sub get_sections_handler { 4232: my ($cmd, $tail, $client) = @_; 4233: my $userinput = "$cmd:$tail"; 4234: 4235: my ($coursecode, $cdom) = split(/:/, $tail); 4236: my @secs = &localenroll::get_sections($coursecode,$cdom); 4237: my $seclist = &escape(join(':',@secs)); 4238: 4239: &Reply($client, "$seclist\n", $userinput); 4240: 4241: 4242: return 1; 4243: } 4244: &register_handler("autogetsections", \&get_sections_handler, 0, 1, 0); 4245: 4246: # Validate the owner of a new course section. 4247: # 4248: # Formal Parameters: 4249: # $cmd - Command that got us dispatched. 4250: # $tail - the remainder of the command. For us this consists of a 4251: # colon separated string containing: 4252: # $inst - Course Id from the institutions point of view. 4253: # $owner - Proposed owner of the course. 4254: # $cdom - Domain of the course (from the institutions 4255: # point of view?).. 4256: # $client - Socket open on the client. 4257: # 4258: # Returns: 4259: # 1 - Processing should continue. 4260: # 4261: sub validate_course_owner_handler { 4262: my ($cmd, $tail, $client) = @_; 4263: my $userinput = "$cmd:$tail"; 4264: my ($inst_course_id, $owner, $cdom) = split(/:/, $tail); 4265: 4266: $owner = &unescape($owner); 4267: my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom); 4268: &Reply($client, "$outcome\n", $userinput); 4269: 4270: 4271: 4272: return 1; 4273: } 4274: &register_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0); 4275: 4276: # 4277: # Validate a course section in the official schedule of classes 4278: # from the institutions point of view (part of autoenrollment). 4279: # 4280: # Formal Parameters: 4281: # $cmd - The command request that got us dispatched. 4282: # $tail - The tail of the command. In this case, 4283: # this is a colon separated set of words that will be split 4284: # into: 4285: # $inst_course_id - The course/section id from the 4286: # institutions point of view. 4287: # $cdom - The domain from the institutions 4288: # point of view. 4289: # $client - Socket open on the client. 4290: # Returns: 4291: # 1 - Indicating processing should continue. 4292: # 4293: sub validate_course_section_handler { 4294: my ($cmd, $tail, $client) = @_; 4295: my $userinput = "$cmd:$tail"; 4296: my ($inst_course_id, $cdom) = split(/:/, $tail); 4297: 4298: my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom); 4299: &Reply($client, "$outcome\n", $userinput); 4300: 4301: 4302: return 1; 4303: } 4304: &register_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0); 4305: 4306: # 4307: # Validate course owner's access to enrollment data for specific class section. 4308: # 4309: # 4310: # Formal Parameters: 4311: # $cmd - The command request that got us dispatched. 4312: # $tail - The tail of the command. In this case this is a colon separated 4313: # set of words that will be split into: 4314: # $inst_class - Institutional code for the specific class section 4315: # $courseowner - The escaped username:domain of the course owner 4316: # $cdom - The domain of the course from the institution's 4317: # point of view. 4318: # $client - The socket open on the client. 4319: # Returns: 4320: # 1 - continue processing. 4321: # 4322: 4323: sub validate_class_access_handler { 4324: my ($cmd, $tail, $client) = @_; 4325: my $userinput = "$cmd:$tail"; 4326: my ($inst_class,$courseowner,$cdom) = split(/:/, $tail); 4327: $courseowner = &unescape($courseowner); 4328: my $outcome; 4329: eval { 4330: local($SIG{__DIE__})='DEFAULT'; 4331: $outcome=&localenroll::check_section($inst_class,$courseowner,$cdom); 4332: }; 4333: &Reply($client,"$outcome\n", $userinput); 4334: 4335: return 1; 4336: } 4337: &register_handler("autovalidateclass_sec", \&validate_class_access_handler, 0, 1, 0); 4338: 4339: # 4340: # Create a password for a new LON-CAPA user added by auto-enrollment. 4341: # Only used for case where authentication method for new user is localauth 4342: # 4343: # Formal Parameters: 4344: # $cmd - The command request that got us dispatched. 4345: # $tail - The tail of the command. In this case this is a colon separated 4346: # set of words that will be split into: 4347: # $authparam - An authentication parameter (localauth parameter). 4348: # $cdom - The domain of the course from the institution's 4349: # point of view. 4350: # $client - The socket open on the client. 4351: # Returns: 4352: # 1 - continue processing. 4353: # 4354: sub create_auto_enroll_password_handler { 4355: my ($cmd, $tail, $client) = @_; 4356: my $userinput = "$cmd:$tail"; 4357: 4358: my ($authparam, $cdom) = split(/:/, $userinput); 4359: 4360: my ($create_passwd,$authchk); 4361: ($authparam, 4362: $create_passwd, 4363: $authchk) = &localenroll::create_password($authparam,$cdom); 4364: 4365: &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n", 4366: $userinput); 4367: 4368: 4369: return 1; 4370: } 4371: &register_handler("autocreatepassword", \&create_auto_enroll_password_handler, 4372: 0, 1, 0); 4373: 4374: # Retrieve and remove temporary files created by/during autoenrollment. 4375: # 4376: # Formal Parameters: 4377: # $cmd - The command that got us dispatched. 4378: # $tail - The tail of the command. In our case this is a colon 4379: # separated list that will be split into: 4380: # $filename - The name of the file to remove. 4381: # The filename is given as a path relative to 4382: # the LonCAPA temp file directory. 4383: # $client - Socket open on the client. 4384: # 4385: # Returns: 4386: # 1 - Continue processing. 4387: sub retrieve_auto_file_handler { 4388: my ($cmd, $tail, $client) = @_; 4389: my $userinput = "cmd:$tail"; 4390: 4391: my ($filename) = split(/:/, $tail); 4392: 4393: my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename; 4394: if ( (-e $source) && ($filename ne '') ) { 4395: my $reply = ''; 4396: if (open(my $fh,$source)) { 4397: while (<$fh>) { 4398: chomp($_); 4399: $_ =~ s/^\s+//g; 4400: $_ =~ s/\s+$//g; 4401: $reply .= $_; 4402: } 4403: close($fh); 4404: &Reply($client, &escape($reply)."\n", $userinput); 4405: 4406: # Does this have to be uncommented??!? (RF). 4407: # 4408: # unlink($source); 4409: } else { 4410: &Failure($client, "error\n", $userinput); 4411: } 4412: } else { 4413: &Failure($client, "error\n", $userinput); 4414: } 4415: 4416: 4417: return 1; 4418: } 4419: &register_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0); 4420: 4421: # 4422: # Read and retrieve institutional code format (for support form). 4423: # Formal Parameters: 4424: # $cmd - Command that dispatched us. 4425: # $tail - Tail of the command. In this case it conatins 4426: # the course domain and the coursename. 4427: # $client - Socket open on the client. 4428: # Returns: 4429: # 1 - Continue processing. 4430: # 4431: sub get_institutional_code_format_handler { 4432: my ($cmd, $tail, $client) = @_; 4433: my $userinput = "$cmd:$tail"; 4434: 4435: my $reply; 4436: my($cdom,$course) = split(/:/,$tail); 4437: my @pairs = split/\&/,$course; 4438: my %instcodes = (); 4439: my %codes = (); 4440: my @codetitles = (); 4441: my %cat_titles = (); 4442: my %cat_order = (); 4443: foreach (@pairs) { 4444: my ($key,$value) = split/=/,$_; 4445: $instcodes{&unescape($key)} = &unescape($value); 4446: } 4447: my $formatreply = &localenroll::instcode_format($cdom, 4448: \%instcodes, 4449: \%codes, 4450: \@codetitles, 4451: \%cat_titles, 4452: \%cat_order); 4453: if ($formatreply eq 'ok') { 4454: my $codes_str = &hash2str(%codes); 4455: my $codetitles_str = &array2str(@codetitles); 4456: my $cat_titles_str = &hash2str(%cat_titles); 4457: my $cat_order_str = &hash2str(%cat_order); 4458: &Reply($client, 4459: $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':' 4460: .$cat_order_str."\n", 4461: $userinput); 4462: } else { 4463: # this else branch added by RF since if not ok, lonc will 4464: # hang waiting on reply until timeout. 4465: # 4466: &Reply($client, "format_error\n", $userinput); 4467: } 4468: 4469: return 1; 4470: } 4471: &register_handler("autoinstcodeformat", 4472: \&get_institutional_code_format_handler,0,1,0); 4473: 4474: sub get_institutional_defaults_handler { 4475: my ($cmd, $tail, $client) = @_; 4476: my $userinput = "$cmd:$tail"; 4477: 4478: my $dom = $tail; 4479: my %defaults_hash; 4480: my @code_order; 4481: my $outcome; 4482: eval { 4483: local($SIG{__DIE__})='DEFAULT'; 4484: $outcome = &localenroll::instcode_defaults($dom,\%defaults_hash, 4485: \@code_order); 4486: }; 4487: if (!$@) { 4488: if ($outcome eq 'ok') { 4489: my $result=''; 4490: while (my ($key,$value) = each(%defaults_hash)) { 4491: $result.=&escape($key).'='.&escape($value).'&'; 4492: } 4493: $result .= 'code_order='.&escape(join('&',@code_order)); 4494: &Reply($client,$result."\n",$userinput); 4495: } else { 4496: &Reply($client,"error\n", $userinput); 4497: } 4498: } else { 4499: &Failure($client,"unknown_cmd\n",$userinput); 4500: } 4501: } 4502: &register_handler("autoinstcodedefaults", 4503: \&get_institutional_defaults_handler,0,1,0); 4504: 4505: 4506: # Get domain specific conditions for import of student photographs to a course 4507: # 4508: # Retrieves information from photo_permission subroutine in localenroll. 4509: # Returns outcome (ok) if no processing errors, and whether course owner is 4510: # required to accept conditions of use (yes/no). 4511: # 4512: # 4513: sub photo_permission_handler { 4514: my ($cmd, $tail, $client) = @_; 4515: my $userinput = "$cmd:$tail"; 4516: my $cdom = $tail; 4517: my ($perm_reqd,$conditions); 4518: my $outcome; 4519: eval { 4520: local($SIG{__DIE__})='DEFAULT'; 4521: $outcome = &localenroll::photo_permission($cdom,\$perm_reqd, 4522: \$conditions); 4523: }; 4524: if (!$@) { 4525: &Reply($client, &escape($outcome.':'.$perm_reqd.':'. $conditions)."\n", 4526: $userinput); 4527: } else { 4528: &Failure($client,"unknown_cmd\n",$userinput); 4529: } 4530: return 1; 4531: } 4532: &register_handler("autophotopermission",\&photo_permission_handler,0,1,0); 4533: 4534: # 4535: # Checks if student photo is available for a user in the domain, in the user's 4536: # directory (in /userfiles/internal/studentphoto.jpg). 4537: # Uses localstudentphoto:fetch() to ensure there is an up to date copy of 4538: # the student's photo. 4539: 4540: sub photo_check_handler { 4541: my ($cmd, $tail, $client) = @_; 4542: my $userinput = "$cmd:$tail"; 4543: my ($udom,$uname,$pid) = split(/:/,$tail); 4544: $udom = &unescape($udom); 4545: $uname = &unescape($uname); 4546: $pid = &unescape($pid); 4547: my $path=&propath($udom,$uname).'/userfiles/internal/'; 4548: if (!-e $path) { 4549: &mkpath($path); 4550: } 4551: my $response; 4552: my $result = &localstudentphoto::fetch($udom,$uname,$pid,\$response); 4553: $result .= ':'.$response; 4554: &Reply($client, &escape($result)."\n",$userinput); 4555: return 1; 4556: } 4557: &register_handler("autophotocheck",\&photo_check_handler,0,1,0); 4558: 4559: # 4560: # Retrieve information from localenroll about whether to provide a button 4561: # for users who have enbled import of student photos to initiate an 4562: # update of photo files for registered students. Also include 4563: # comment to display alongside button. 4564: 4565: sub photo_choice_handler { 4566: my ($cmd, $tail, $client) = @_; 4567: my $userinput = "$cmd:$tail"; 4568: my $cdom = &unescape($tail); 4569: my ($update,$comment); 4570: eval { 4571: local($SIG{__DIE__})='DEFAULT'; 4572: ($update,$comment) = &localenroll::manager_photo_update($cdom); 4573: }; 4574: if (!$@) { 4575: &Reply($client,&escape($update).':'.&escape($comment)."\n",$userinput); 4576: } else { 4577: &Failure($client,"unknown_cmd\n",$userinput); 4578: } 4579: return 1; 4580: } 4581: &register_handler("autophotochoice",\&photo_choice_handler,0,1,0); 4582: 4583: # 4584: # Gets a student's photo to exist (in the correct image type) in the user's 4585: # directory. 4586: # Formal Parameters: 4587: # $cmd - The command request that got us dispatched. 4588: # $tail - A colon separated set of words that will be split into: 4589: # $domain - student's domain 4590: # $uname - student username 4591: # $type - image type desired 4592: # $client - The socket open on the client. 4593: # Returns: 4594: # 1 - continue processing. 4595: 4596: sub student_photo_handler { 4597: my ($cmd, $tail, $client) = @_; 4598: my ($domain,$uname,$ext,$type) = split(/:/, $tail); 4599: 4600: my $path=&propath($domain,$uname). '/userfiles/internal/'; 4601: my $filename = 'studentphoto.'.$ext; 4602: if ($type eq 'thumbnail') { 4603: $filename = 'studentphoto_tn.'.$ext; 4604: } 4605: if (-e $path.$filename) { 4606: &Reply($client,"ok\n","$cmd:$tail"); 4607: return 1; 4608: } 4609: &mkpath($path); 4610: my $file; 4611: if ($type eq 'thumbnail') { 4612: eval { 4613: local($SIG{__DIE__})='DEFAULT'; 4614: $file=&localstudentphoto::fetch_thumbnail($domain,$uname); 4615: }; 4616: } else { 4617: $file=&localstudentphoto::fetch($domain,$uname); 4618: } 4619: if (!$file) { 4620: &Failure($client,"unavailable\n","$cmd:$tail"); 4621: return 1; 4622: } 4623: if (!-e $path.$filename) { &convert_photo($file,$path.$filename); } 4624: if (-e $path.$filename) { 4625: &Reply($client,"ok\n","$cmd:$tail"); 4626: return 1; 4627: } 4628: &Failure($client,"unable_to_convert\n","$cmd:$tail"); 4629: return 1; 4630: } 4631: &register_handler("studentphoto", \&student_photo_handler, 0, 1, 0); 4632: 4633: # mkpath makes all directories for a file, expects an absolute path with a 4634: # file or a trailing / if just a dir is passed 4635: # returns 1 on success 0 on failure 4636: sub mkpath { 4637: my ($file)=@_; 4638: my @parts=split(/\//,$file,-1); 4639: my $now=$parts[0].'/'.$parts[1].'/'.$parts[2]; 4640: for (my $i=3;$i<= ($#parts-1);$i++) { 4641: $now.='/'.$parts[$i]; 4642: if (!-e $now) { 4643: if (!mkdir($now,0770)) { return 0; } 4644: } 4645: } 4646: return 1; 4647: } 4648: 4649: #--------------------------------------------------------------- 4650: # 4651: # Getting, decoding and dispatching requests: 4652: # 4653: # 4654: # Get a Request: 4655: # Gets a Request message from the client. The transaction 4656: # is defined as a 'line' of text. We remove the new line 4657: # from the text line. 4658: # 4659: sub get_request { 4660: my $input = <$client>; 4661: chomp($input); 4662: 4663: &Debug("get_request: Request = $input\n"); 4664: 4665: &status('Processing '.$clientname.':'.$input); 4666: 4667: return $input; 4668: } 4669: #--------------------------------------------------------------- 4670: # 4671: # Process a request. This sub should shrink as each action 4672: # gets farmed out into a separat sub that is registered 4673: # with the dispatch hash. 4674: # 4675: # Parameters: 4676: # user_input - The request received from the client (lonc). 4677: # Returns: 4678: # true to keep processing, false if caller should exit. 4679: # 4680: sub process_request { 4681: my ($userinput) = @_; # Easier for now to break style than to 4682: # fix all the userinput -> user_input. 4683: my $wasenc = 0; # True if request was encrypted. 4684: # ------------------------------------------------------------ See if encrypted 4685: # for command 4686: # sethost:<server> 4687: # <command>:<args> 4688: # we just send it to the processor 4689: # for 4690: # sethost:<server>:<command>:<args> 4691: # we do the implict set host and then do the command 4692: if ($userinput =~ /^sethost:/) { 4693: (my $cmd,my $newid,$userinput) = split(':',$userinput,3); 4694: if (defined($userinput)) { 4695: &sethost("$cmd:$newid"); 4696: } else { 4697: $userinput = "$cmd:$newid"; 4698: } 4699: } 4700: 4701: if ($userinput =~ /^enc/) { 4702: $userinput = decipher($userinput); 4703: $wasenc=1; 4704: if(!$userinput) { # Cipher not defined. 4705: &Failure($client, "error: Encrypted data without negotated key\n"); 4706: return 0; 4707: } 4708: } 4709: Debug("process_request: $userinput\n"); 4710: 4711: # 4712: # The 'correct way' to add a command to lond is now to 4713: # write a sub to execute it and Add it to the command dispatch 4714: # hash via a call to register_handler.. The comments to that 4715: # sub should give you enough to go on to show how to do this 4716: # along with the examples that are building up as this code 4717: # is getting refactored. Until all branches of the 4718: # if/elseif monster below have been factored out into 4719: # separate procesor subs, if the dispatch hash is missing 4720: # the command keyword, we will fall through to the remainder 4721: # of the if/else chain below in order to keep this thing in 4722: # working order throughout the transmogrification. 4723: 4724: my ($command, $tail) = split(/:/, $userinput, 2); 4725: chomp($command); 4726: chomp($tail); 4727: $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet. 4728: $command =~ s/(\r)//; # And this too for parameterless commands. 4729: if(!$tail) { 4730: $tail =""; # defined but blank. 4731: } 4732: 4733: &Debug("Command received: $command, encoded = $wasenc"); 4734: 4735: if(defined $Dispatcher{$command}) { 4736: 4737: my $dispatch_info = $Dispatcher{$command}; 4738: my $handler = $$dispatch_info[0]; 4739: my $need_encode = $$dispatch_info[1]; 4740: my $client_types = $$dispatch_info[2]; 4741: Debug("Matched dispatch hash: mustencode: $need_encode " 4742: ."ClientType $client_types"); 4743: 4744: # Validate the request: 4745: 4746: my $ok = 1; 4747: my $requesterprivs = 0; 4748: if(&isClient()) { 4749: $requesterprivs |= $CLIENT_OK; 4750: } 4751: if(&isManager()) { 4752: $requesterprivs |= $MANAGER_OK; 4753: } 4754: if($need_encode && (!$wasenc)) { 4755: Debug("Must encode but wasn't: $need_encode $wasenc"); 4756: $ok = 0; 4757: } 4758: if(($client_types & $requesterprivs) == 0) { 4759: Debug("Client not privileged to do this operation"); 4760: $ok = 0; 4761: } 4762: 4763: if($ok) { 4764: Debug("Dispatching to handler $command $tail"); 4765: my $keep_going = &$handler($command, $tail, $client); 4766: return $keep_going; 4767: } else { 4768: Debug("Refusing to dispatch because client did not match requirements"); 4769: Failure($client, "refused\n", $userinput); 4770: return 1; 4771: } 4772: 4773: } 4774: 4775: print $client "unknown_cmd\n"; 4776: # -------------------------------------------------------------------- complete 4777: Debug("process_request - returning 1"); 4778: return 1; 4779: } 4780: # 4781: # Decipher encoded traffic 4782: # Parameters: 4783: # input - Encoded data. 4784: # Returns: 4785: # Decoded data or undef if encryption key was not yet negotiated. 4786: # Implicit input: 4787: # cipher - This global holds the negotiated encryption key. 4788: # 4789: sub decipher { 4790: my ($input) = @_; 4791: my $output = ''; 4792: 4793: 4794: if($cipher) { 4795: my($enc, $enclength, $encinput) = split(/:/, $input); 4796: for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) { 4797: $output .= 4798: $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16))); 4799: } 4800: return substr($output, 0, $enclength); 4801: } else { 4802: return undef; 4803: } 4804: } 4805: 4806: # 4807: # Register a command processor. This function is invoked to register a sub 4808: # to process a request. Once registered, the ProcessRequest sub can automatically 4809: # dispatch requests to an appropriate sub, and do the top level validity checking 4810: # as well: 4811: # - Is the keyword recognized. 4812: # - Is the proper client type attempting the request. 4813: # - Is the request encrypted if it has to be. 4814: # Parameters: 4815: # $request_name - Name of the request being registered. 4816: # This is the command request that will match 4817: # against the hash keywords to lookup the information 4818: # associated with the dispatch information. 4819: # $procedure - Reference to a sub to call to process the request. 4820: # All subs get called as follows: 4821: # Procedure($cmd, $tail, $replyfd, $key) 4822: # $cmd - the actual keyword that invoked us. 4823: # $tail - the tail of the request that invoked us. 4824: # $replyfd- File descriptor connected to the client 4825: # $must_encode - True if the request must be encoded to be good. 4826: # $client_ok - True if it's ok for a client to request this. 4827: # $manager_ok - True if it's ok for a manager to request this. 4828: # Side effects: 4829: # - On success, the Dispatcher hash has an entry added for the key $RequestName 4830: # - On failure, the program will die as it's a bad internal bug to try to 4831: # register a duplicate command handler. 4832: # 4833: sub register_handler { 4834: my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok) = @_; 4835: 4836: # Don't allow duplication# 4837: 4838: if (defined $Dispatcher{$request_name}) { 4839: die "Attempting to define a duplicate request handler for $request_name\n"; 4840: } 4841: # Build the client type mask: 4842: 4843: my $client_type_mask = 0; 4844: if($client_ok) { 4845: $client_type_mask |= $CLIENT_OK; 4846: } 4847: if($manager_ok) { 4848: $client_type_mask |= $MANAGER_OK; 4849: } 4850: 4851: # Enter the hash: 4852: 4853: my @entry = ($procedure, $must_encode, $client_type_mask); 4854: 4855: $Dispatcher{$request_name} = \@entry; 4856: 4857: } 4858: 4859: 4860: #------------------------------------------------------------------ 4861: 4862: 4863: 4864: 4865: # 4866: # Convert an error return code from lcpasswd to a string value. 4867: # 4868: sub lcpasswdstrerror { 4869: my $ErrorCode = shift; 4870: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) { 4871: return "lcpasswd Unrecognized error return value ".$ErrorCode; 4872: } else { 4873: return $passwderrors[$ErrorCode]; 4874: } 4875: } 4876: 4877: # 4878: # Convert an error return code from lcuseradd to a string value: 4879: # 4880: sub lcuseraddstrerror { 4881: my $ErrorCode = shift; 4882: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) { 4883: return "lcuseradd - Unrecognized error code: ".$ErrorCode; 4884: } else { 4885: return $adderrors[$ErrorCode]; 4886: } 4887: } 4888: 4889: # grabs exception and records it to log before exiting 4890: sub catchexception { 4891: my ($error)=@_; 4892: $SIG{'QUIT'}='DEFAULT'; 4893: $SIG{__DIE__}='DEFAULT'; 4894: &status("Catching exception"); 4895: &logthis("CRITICAL: " 4896: ."ABNORMAL EXIT. Child $$ for server $thisserver died through " 4897: ."a crash with this error msg->[$error]"); 4898: &logthis('Famous last words: '.$status.' - '.$lastlog); 4899: if ($client) { print $client "error: $error\n"; } 4900: $server->close(); 4901: die($error); 4902: } 4903: sub timeout { 4904: &status("Handling Timeout"); 4905: &logthis("CRITICAL: TIME OUT ".$$.""); 4906: &catchexception('Timeout'); 4907: } 4908: # -------------------------------- Set signal handlers to record abnormal exits 4909: 4910: 4911: $SIG{'QUIT'}=\&catchexception; 4912: $SIG{__DIE__}=\&catchexception; 4913: 4914: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf 4915: &status("Read loncapa.conf and loncapa_apache.conf"); 4916: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf'); 4917: %perlvar=%{$perlvarref}; 4918: undef $perlvarref; 4919: 4920: # ----------------------------- Make sure this process is running from user=www 4921: my $wwwid=getpwnam('www'); 4922: if ($wwwid!=$<) { 4923: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; 4924: my $subj="LON: $currenthostid User ID mismatch"; 4925: system("echo 'User ID mismatch. lond must be run as user www.' |\ 4926: mailto $emailto -s '$subj' > /dev/null"); 4927: exit 1; 4928: } 4929: 4930: # --------------------------------------------- Check if other instance running 4931: 4932: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid"; 4933: 4934: if (-e $pidfile) { 4935: my $lfh=IO::File->new("$pidfile"); 4936: my $pide=<$lfh>; 4937: chomp($pide); 4938: if (kill 0 => $pide) { die "already running"; } 4939: } 4940: 4941: # ------------------------------------------------------------- Read hosts file 4942: 4943: 4944: 4945: # establish SERVER socket, bind and listen. 4946: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'}, 4947: Type => SOCK_STREAM, 4948: Proto => 'tcp', 4949: Reuse => 1, 4950: Listen => 10 ) 4951: or die "making socket: $@\n"; 4952: 4953: # --------------------------------------------------------- Do global variables 4954: 4955: # global variables 4956: 4957: my %children = (); # keys are current child process IDs 4958: 4959: sub REAPER { # takes care of dead children 4960: $SIG{CHLD} = \&REAPER; 4961: &status("Handling child death"); 4962: my $pid; 4963: do { 4964: $pid = waitpid(-1,&WNOHANG()); 4965: if (defined($children{$pid})) { 4966: &logthis("Child $pid died"); 4967: delete($children{$pid}); 4968: } elsif ($pid > 0) { 4969: &logthis("Unknown Child $pid died"); 4970: } 4971: } while ( $pid > 0 ); 4972: foreach my $child (keys(%children)) { 4973: $pid = waitpid($child,&WNOHANG()); 4974: if ($pid > 0) { 4975: &logthis("Child $child - $pid looks like we missed it's death"); 4976: delete($children{$pid}); 4977: } 4978: } 4979: &status("Finished Handling child death"); 4980: } 4981: 4982: sub HUNTSMAN { # signal handler for SIGINT 4983: &status("Killing children (INT)"); 4984: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children 4985: kill 'INT' => keys %children; 4986: &logthis("Free socket: ".shutdown($server,2)); # free up socket 4987: my $execdir=$perlvar{'lonDaemons'}; 4988: unlink("$execdir/logs/lond.pid"); 4989: &logthis("CRITICAL: Shutting down"); 4990: &status("Done killing children"); 4991: exit; # clean up with dignity 4992: } 4993: 4994: sub HUPSMAN { # signal handler for SIGHUP 4995: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children 4996: &status("Killing children for restart (HUP)"); 4997: kill 'INT' => keys %children; 4998: &logthis("Free socket: ".shutdown($server,2)); # free up socket 4999: &logthis("CRITICAL: Restarting"); 5000: my $execdir=$perlvar{'lonDaemons'}; 5001: unlink("$execdir/logs/lond.pid"); 5002: &status("Restarting self (HUP)"); 5003: exec("$execdir/lond"); # here we go again 5004: } 5005: 5006: # 5007: # Kill off hashes that describe the host table prior to re-reading it. 5008: # Hashes affected are: 5009: # %hostid, %hostdom %hostip %hostdns. 5010: # 5011: sub KillHostHashes { 5012: foreach my $key (keys %hostid) { 5013: delete $hostid{$key}; 5014: } 5015: foreach my $key (keys %hostdom) { 5016: delete $hostdom{$key}; 5017: } 5018: foreach my $key (keys %hostip) { 5019: delete $hostip{$key}; 5020: } 5021: foreach my $key (keys %hostdns) { 5022: delete $hostdns{$key}; 5023: } 5024: } 5025: # 5026: # Read in the host table from file and distribute it into the various hashes: 5027: # 5028: # - %hostid - Indexed by IP, the loncapa hostname. 5029: # - %hostdom - Indexed by loncapa hostname, the domain. 5030: # - %hostip - Indexed by hostid, the Ip address of the host. 5031: sub ReadHostTable { 5032: 5033: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file"; 5034: my $myloncapaname = $perlvar{'lonHostID'}; 5035: Debug("My loncapa name is : $myloncapaname"); 5036: my %name_to_ip; 5037: while (my $configline=<CONFIG>) { 5038: if ($configline !~ /^\s*\#/ && $configline !~ /^\s*$/ ) { 5039: my ($id,$domain,$role,$name)=split(/:/,$configline); 5040: $name=~s/\s//g; 5041: my $ip; 5042: if (!exists($name_to_ip{$name})) { 5043: $ip = gethostbyname($name); 5044: if (!$ip || length($ip) ne 4) { 5045: &logthis("Skipping host $id name $name no IP found\n"); 5046: next; 5047: } 5048: $ip=inet_ntoa($ip); 5049: $name_to_ip{$name} = $ip; 5050: } else { 5051: $ip = $name_to_ip{$name}; 5052: } 5053: $hostid{$ip}=$id; # LonCAPA name of host by IP. 5054: $hostdom{$id}=$domain; # LonCAPA domain name of host. 5055: $hostname{$id}=$name; # LonCAPA name -> DNS name 5056: $hostip{$id}=$ip; # IP address of host. 5057: $hostdns{$name} = $id; # LonCAPA name of host by DNS. 5058: 5059: if ($id eq $perlvar{'lonHostID'}) { 5060: Debug("Found me in the host table: $name"); 5061: $thisserver=$name; 5062: } 5063: } 5064: } 5065: close(CONFIG); 5066: } 5067: # 5068: # Reload the Apache daemon's state. 5069: # This is done by invoking /home/httpd/perl/apachereload 5070: # a setuid perl script that can be root for us to do this job. 5071: # 5072: sub ReloadApache { 5073: my $execdir = $perlvar{'lonDaemons'}; 5074: my $script = $execdir."/apachereload"; 5075: system($script); 5076: } 5077: 5078: # 5079: # Called in response to a USR2 signal. 5080: # - Reread hosts.tab 5081: # - All children connected to hosts that were removed from hosts.tab 5082: # are killed via SIGINT 5083: # - All children connected to previously existing hosts are sent SIGUSR1 5084: # - Our internal hosts hash is updated to reflect the new contents of 5085: # hosts.tab causing connections from hosts added to hosts.tab to 5086: # now be honored. 5087: # 5088: sub UpdateHosts { 5089: &status("Reload hosts.tab"); 5090: logthis(' Updating connections '); 5091: # 5092: # The %children hash has the set of IP's we currently have children 5093: # on. These need to be matched against records in the hosts.tab 5094: # Any ip's no longer in the table get killed off they correspond to 5095: # either dropped or changed hosts. Note that the re-read of the table 5096: # will take care of new and changed hosts as connections come into being. 5097: 5098: 5099: KillHostHashes; 5100: ReadHostTable; 5101: 5102: foreach my $child (keys %children) { 5103: my $childip = $children{$child}; 5104: if(!$hostid{$childip}) { 5105: logthis(' UpdateHosts killing child ' 5106: ." $child for ip $childip "); 5107: kill('INT', $child); 5108: } else { 5109: logthis(' keeping child for ip ' 5110: ." $childip (pid=$child) "); 5111: } 5112: } 5113: ReloadApache; 5114: &status("Finished reloading hosts.tab"); 5115: } 5116: 5117: 5118: sub checkchildren { 5119: &status("Checking on the children (sending signals)"); 5120: &initnewstatus(); 5121: &logstatus(); 5122: &logthis('Going to check on the children'); 5123: my $docdir=$perlvar{'lonDocRoot'}; 5124: foreach (sort keys %children) { 5125: #sleep 1; 5126: unless (kill 'USR1' => $_) { 5127: &logthis ('Child '.$_.' is dead'); 5128: &logstatus($$.' is dead'); 5129: delete($children{$_}); 5130: } 5131: } 5132: sleep 5; 5133: $SIG{ALRM} = sub { Debug("timeout"); 5134: die "timeout"; }; 5135: $SIG{__DIE__} = 'DEFAULT'; 5136: &status("Checking on the children (waiting for reports)"); 5137: foreach (sort keys %children) { 5138: unless (-e "$docdir/lon-status/londchld/$_.txt") { 5139: eval { 5140: alarm(300); 5141: &logthis('Child '.$_.' did not respond'); 5142: kill 9 => $_; 5143: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; 5144: #$subj="LON: $currenthostid killed lond process $_"; 5145: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`; 5146: #$execdir=$perlvar{'lonDaemons'}; 5147: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`; 5148: delete($children{$_}); 5149: alarm(0); 5150: } 5151: } 5152: } 5153: $SIG{ALRM} = 'DEFAULT'; 5154: $SIG{__DIE__} = \&catchexception; 5155: &status("Finished checking children"); 5156: &logthis('Finished Checking children'); 5157: } 5158: 5159: # --------------------------------------------------------------------- Logging 5160: 5161: sub logthis { 5162: my $message=shift; 5163: my $execdir=$perlvar{'lonDaemons'}; 5164: my $fh=IO::File->new(">>$execdir/logs/lond.log"); 5165: my $now=time; 5166: my $local=localtime($now); 5167: $lastlog=$local.': '.$message; 5168: print $fh "$local ($$): $message\n"; 5169: } 5170: 5171: # ------------------------- Conditional log if $DEBUG true. 5172: sub Debug { 5173: my $message = shift; 5174: if($DEBUG) { 5175: &logthis($message); 5176: } 5177: } 5178: 5179: # 5180: # Sub to do replies to client.. this gives a hook for some 5181: # debug tracing too: 5182: # Parameters: 5183: # fd - File open on client. 5184: # reply - Text to send to client. 5185: # request - Original request from client. 5186: # 5187: sub Reply { 5188: my ($fd, $reply, $request) = @_; 5189: print $fd $reply; 5190: Debug("Request was $request Reply was $reply"); 5191: 5192: $Transactions++; 5193: } 5194: 5195: 5196: # 5197: # Sub to report a failure. 5198: # This function: 5199: # - Increments the failure statistic counters. 5200: # - Invokes Reply to send the error message to the client. 5201: # Parameters: 5202: # fd - File descriptor open on the client 5203: # reply - Reply text to emit. 5204: # request - The original request message (used by Reply 5205: # to debug if that's enabled. 5206: # Implicit outputs: 5207: # $Failures- The number of failures is incremented. 5208: # Reply (invoked here) sends a message to the 5209: # client: 5210: # 5211: sub Failure { 5212: my $fd = shift; 5213: my $reply = shift; 5214: my $request = shift; 5215: 5216: $Failures++; 5217: Reply($fd, $reply, $request); # That's simple eh? 5218: } 5219: # ------------------------------------------------------------------ Log status 5220: 5221: sub logstatus { 5222: &status("Doing logging"); 5223: my $docdir=$perlvar{'lonDocRoot'}; 5224: { 5225: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt"); 5226: print $fh $status."\n".$lastlog."\n".time."\n$keymode"; 5227: $fh->close(); 5228: } 5229: &status("Finished $$.txt"); 5230: { 5231: open(LOG,">>$docdir/lon-status/londstatus.txt"); 5232: flock(LOG,LOCK_EX); 5233: print LOG $$."\t".$clientname."\t".$currenthostid."\t" 5234: .$status."\t".$lastlog."\t $keymode\n"; 5235: flock(LOG,LOCK_UN); 5236: close(LOG); 5237: } 5238: &status("Finished logging"); 5239: } 5240: 5241: sub initnewstatus { 5242: my $docdir=$perlvar{'lonDocRoot'}; 5243: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt"); 5244: my $now=time; 5245: my $local=localtime($now); 5246: print $fh "LOND status $local - parent $$\n\n"; 5247: opendir(DIR,"$docdir/lon-status/londchld"); 5248: while (my $filename=readdir(DIR)) { 5249: unlink("$docdir/lon-status/londchld/$filename"); 5250: } 5251: closedir(DIR); 5252: } 5253: 5254: # -------------------------------------------------------------- Status setting 5255: 5256: sub status { 5257: my $what=shift; 5258: my $now=time; 5259: my $local=localtime($now); 5260: $status=$local.': '.$what; 5261: $0='lond: '.$what.' '.$local; 5262: } 5263: 5264: # ----------------------------------------------------------- Send USR1 to lonc 5265: 5266: sub reconlonc { 5267: my $peerfile=shift; 5268: &logthis("Trying to reconnect for $peerfile"); 5269: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid"; 5270: if (my $fh=IO::File->new("$loncfile")) { 5271: my $loncpid=<$fh>; 5272: chomp($loncpid); 5273: if (kill 0 => $loncpid) { 5274: &logthis("lonc at pid $loncpid responding, sending USR1"); 5275: kill USR1 => $loncpid; 5276: } else { 5277: &logthis( 5278: "CRITICAL: " 5279: ."lonc at pid $loncpid not responding, giving up"); 5280: } 5281: } else { 5282: &logthis('CRITICAL: lonc not running, giving up'); 5283: } 5284: } 5285: 5286: # -------------------------------------------------- Non-critical communication 5287: 5288: sub subreply { 5289: my ($cmd,$server)=@_; 5290: my $peerfile="$perlvar{'lonSockDir'}/".$hostname{$server}; 5291: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile", 5292: Type => SOCK_STREAM, 5293: Timeout => 10) 5294: or return "con_lost"; 5295: print $sclient "sethost:$server:$cmd\n"; 5296: my $answer=<$sclient>; 5297: chomp($answer); 5298: if (!$answer) { $answer="con_lost"; } 5299: return $answer; 5300: } 5301: 5302: sub reply { 5303: my ($cmd,$server)=@_; 5304: my $answer; 5305: if ($server ne $currenthostid) { 5306: $answer=subreply($cmd,$server); 5307: if ($answer eq 'con_lost') { 5308: $answer=subreply("ping",$server); 5309: if ($answer ne $server) { 5310: &logthis("sub reply: answer != server answer is $answer, server is $server"); 5311: &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$server}); 5312: } 5313: $answer=subreply($cmd,$server); 5314: } 5315: } else { 5316: $answer='self_reply'; 5317: } 5318: return $answer; 5319: } 5320: 5321: # -------------------------------------------------------------- Talk to lonsql 5322: 5323: sub sql_reply { 5324: my ($cmd)=@_; 5325: my $answer=&sub_sql_reply($cmd); 5326: if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); } 5327: return $answer; 5328: } 5329: 5330: sub sub_sql_reply { 5331: my ($cmd)=@_; 5332: my $unixsock="mysqlsock"; 5333: my $peerfile="$perlvar{'lonSockDir'}/$unixsock"; 5334: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile", 5335: Type => SOCK_STREAM, 5336: Timeout => 10) 5337: or return "con_lost"; 5338: print $sclient "$cmd:$currentdomainid\n"; 5339: my $answer=<$sclient>; 5340: chomp($answer); 5341: if (!$answer) { $answer="con_lost"; } 5342: return $answer; 5343: } 5344: 5345: # --------------------------------------- Is this the home server of an author? 5346: 5347: sub ishome { 5348: my $author=shift; 5349: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/; 5350: my ($udom,$uname)=split(/\//,$author); 5351: my $proname=propath($udom,$uname); 5352: if (-e $proname) { 5353: return 'owner'; 5354: } else { 5355: return 'not_owner'; 5356: } 5357: } 5358: 5359: # ======================================================= Continue main program 5360: # ---------------------------------------------------- Fork once and dissociate 5361: 5362: my $fpid=fork; 5363: exit if $fpid; 5364: die "Couldn't fork: $!" unless defined ($fpid); 5365: 5366: POSIX::setsid() or die "Can't start new session: $!"; 5367: 5368: # ------------------------------------------------------- Write our PID on disk 5369: 5370: my $execdir=$perlvar{'lonDaemons'}; 5371: open (PIDSAVE,">$execdir/logs/lond.pid"); 5372: print PIDSAVE "$$\n"; 5373: close(PIDSAVE); 5374: &logthis("CRITICAL: ---------- Starting ----------"); 5375: &status('Starting'); 5376: 5377: 5378: 5379: # ----------------------------------------------------- Install signal handlers 5380: 5381: 5382: $SIG{CHLD} = \&REAPER; 5383: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN; 5384: $SIG{HUP} = \&HUPSMAN; 5385: $SIG{USR1} = \&checkchildren; 5386: $SIG{USR2} = \&UpdateHosts; 5387: 5388: # Read the host hashes: 5389: 5390: ReadHostTable; 5391: 5392: my $dist=`$perlvar{'lonDaemons'}/distprobe`; 5393: 5394: # -------------------------------------------------------------- 5395: # Accept connections. When a connection comes in, it is validated 5396: # and if good, a child process is created to process transactions 5397: # along the connection. 5398: 5399: while (1) { 5400: &status('Starting accept'); 5401: $client = $server->accept() or next; 5402: &status('Accepted '.$client.' off to spawn'); 5403: make_new_child($client); 5404: &status('Finished spawning'); 5405: } 5406: 5407: sub make_new_child { 5408: my $pid; 5409: # my $cipher; # Now global 5410: my $sigset; 5411: 5412: $client = shift; 5413: &status('Starting new child '.$client); 5414: &logthis(' Attempting to start child ('.$client. 5415: ")"); 5416: # block signal for fork 5417: $sigset = POSIX::SigSet->new(SIGINT); 5418: sigprocmask(SIG_BLOCK, $sigset) 5419: or die "Can't block SIGINT for fork: $!\n"; 5420: 5421: die "fork: $!" unless defined ($pid = fork); 5422: 5423: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of 5424: # connection liveness. 5425: 5426: # 5427: # Figure out who we're talking to so we can record the peer in 5428: # the pid hash. 5429: # 5430: my $caller = getpeername($client); 5431: my ($port,$iaddr); 5432: if (defined($caller) && length($caller) > 0) { 5433: ($port,$iaddr)=unpack_sockaddr_in($caller); 5434: } else { 5435: &logthis("Unable to determine who caller was, getpeername returned nothing"); 5436: } 5437: if (defined($iaddr)) { 5438: $clientip = inet_ntoa($iaddr); 5439: Debug("Connected with $clientip"); 5440: } else { 5441: &logthis("Unable to determine clientip"); 5442: $clientip='Unavailable'; 5443: } 5444: 5445: if ($pid) { 5446: # Parent records the child's birth and returns. 5447: sigprocmask(SIG_UNBLOCK, $sigset) 5448: or die "Can't unblock SIGINT for fork: $!\n"; 5449: $children{$pid} = $clientip; 5450: &status('Started child '.$pid); 5451: return; 5452: } else { 5453: # Child can *not* return from this subroutine. 5454: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before 5455: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 5456: #don't get intercepted 5457: $SIG{USR1}= \&logstatus; 5458: $SIG{ALRM}= \&timeout; 5459: $lastlog='Forked '; 5460: $status='Forked'; 5461: 5462: # unblock signals 5463: sigprocmask(SIG_UNBLOCK, $sigset) 5464: or die "Can't unblock SIGINT for fork: $!\n"; 5465: 5466: # my $tmpsnum=0; # Now global 5467: #---------------------------------------------------- kerberos 5 initialization 5468: &Authen::Krb5::init_context(); 5469: unless (($dist eq 'fedora5') || ($dist eq 'fedora4') || 5470: ($dist eq 'fedora6') || ($dist eq 'suse9.3')) { 5471: &Authen::Krb5::init_ets(); 5472: } 5473: 5474: &status('Accepted connection'); 5475: # ============================================================================= 5476: # do something with the connection 5477: # ----------------------------------------------------------------------------- 5478: # see if we know client and 'check' for spoof IP by ineffective challenge 5479: 5480: ReadManagerTable; # May also be a manager!! 5481: 5482: my $outsideip=$clientip; 5483: if ($clientip eq '127.0.0.1') { 5484: $outsideip=$hostip{$perlvar{'lonHostID'}}; 5485: } 5486: 5487: my $clientrec=($hostid{$outsideip} ne undef); 5488: my $ismanager=($managers{$outsideip} ne undef); 5489: $clientname = "[unknonwn]"; 5490: if($clientrec) { # Establish client type. 5491: $ConnectionType = "client"; 5492: $clientname = $hostid{$outsideip}; 5493: if($ismanager) { 5494: $ConnectionType = "both"; 5495: } 5496: } else { 5497: $ConnectionType = "manager"; 5498: $clientname = $managers{$outsideip}; 5499: } 5500: my $clientok; 5501: 5502: if ($clientrec || $ismanager) { 5503: &status("Waiting for init from $clientip $clientname"); 5504: &logthis('INFO: Connection, '. 5505: $clientip. 5506: " ($clientname) connection type = $ConnectionType " ); 5507: &status("Connecting $clientip ($clientname))"); 5508: my $remotereq=<$client>; 5509: chomp($remotereq); 5510: Debug("Got init: $remotereq"); 5511: 5512: if ($remotereq =~ /^init/) { 5513: &sethost("sethost:$perlvar{'lonHostID'}"); 5514: # 5515: # If the remote is attempting a local init... give that a try: 5516: # 5517: my ($i, $inittype) = split(/:/, $remotereq); 5518: 5519: # If the connection type is ssl, but I didn't get my 5520: # certificate files yet, then I'll drop back to 5521: # insecure (if allowed). 5522: 5523: if($inittype eq "ssl") { 5524: my ($ca, $cert) = lonssl::CertificateFile; 5525: my $kfile = lonssl::KeyFile; 5526: if((!$ca) || 5527: (!$cert) || 5528: (!$kfile)) { 5529: $inittype = ""; # This forces insecure attempt. 5530: &logthis(" Certificates not " 5531: ."installed -- trying insecure auth"); 5532: } else { # SSL certificates are in place so 5533: } # Leave the inittype alone. 5534: } 5535: 5536: if($inittype eq "local") { 5537: my $key = LocalConnection($client, $remotereq); 5538: if($key) { 5539: Debug("Got local key $key"); 5540: $clientok = 1; 5541: my $cipherkey = pack("H32", $key); 5542: $cipher = new IDEA($cipherkey); 5543: print $client "ok:local\n"; 5544: &logthis('"); 5546: $keymode = "local" 5547: } else { 5548: Debug("Failed to get local key"); 5549: $clientok = 0; 5550: shutdown($client, 3); 5551: close $client; 5552: } 5553: } elsif ($inittype eq "ssl") { 5554: my $key = SSLConnection($client); 5555: if ($key) { 5556: $clientok = 1; 5557: my $cipherkey = pack("H32", $key); 5558: $cipher = new IDEA($cipherkey); 5559: &logthis('' 5560: ."Successfull ssl authentication with $clientname "); 5561: $keymode = "ssl"; 5562: 5563: } else { 5564: $clientok = 0; 5565: close $client; 5566: } 5567: 5568: } else { 5569: my $ok = InsecureConnection($client); 5570: if($ok) { 5571: $clientok = 1; 5572: &logthis('' 5573: ."Successful insecure authentication with $clientname "); 5574: print $client "ok\n"; 5575: $keymode = "insecure"; 5576: } else { 5577: &logthis('' 5578: ."Attempted insecure connection disallowed "); 5579: close $client; 5580: $clientok = 0; 5581: 5582: } 5583: } 5584: } else { 5585: &logthis( 5586: "WARNING: " 5587: ."$clientip failed to initialize: >$remotereq< "); 5588: &status('No init '.$clientip); 5589: } 5590: 5591: } else { 5592: &logthis( 5593: "WARNING: Unknown client $clientip"); 5594: &status('Hung up on '.$clientip); 5595: } 5596: 5597: if ($clientok) { 5598: # ---------------- New known client connecting, could mean machine online again 5599: 5600: foreach my $id (keys(%hostip)) { 5601: if ($hostip{$id} ne $clientip || 5602: $hostip{$currenthostid} eq $clientip) { 5603: # no need to try to do recon's to myself 5604: next; 5605: } 5606: &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$id}); 5607: } 5608: &logthis("Established connection: $clientname"); 5609: &status('Will listen to '.$clientname); 5610: # ------------------------------------------------------------ Process requests 5611: my $keep_going = 1; 5612: my $user_input; 5613: while(($user_input = get_request) && $keep_going) { 5614: alarm(120); 5615: Debug("Main: Got $user_input\n"); 5616: $keep_going = &process_request($user_input); 5617: alarm(0); 5618: &status('Listening to '.$clientname." ($keymode)"); 5619: } 5620: 5621: # --------------------------------------------- client unknown or fishy, refuse 5622: } else { 5623: print $client "refused\n"; 5624: $client->close(); 5625: &logthis("WARNING: " 5626: ."Rejected client $clientip, closing connection"); 5627: } 5628: } 5629: 5630: # ============================================================================= 5631: 5632: &logthis("CRITICAL: " 5633: ."Disconnect from $clientip ($clientname)"); 5634: 5635: 5636: # this exit is VERY important, otherwise the child will become 5637: # a producer of more and more children, forking yourself into 5638: # process death. 5639: exit; 5640: 5641: } 5642: # 5643: # Determine if a user is an author for the indicated domain. 5644: # 5645: # Parameters: 5646: # domain - domain to check in . 5647: # user - Name of user to check. 5648: # 5649: # Return: 5650: # 1 - User is an author for domain. 5651: # 0 - User is not an author for domain. 5652: sub is_author { 5653: my ($domain, $user) = @_; 5654: 5655: &Debug("is_author: $user @ $domain"); 5656: 5657: my $hashref = &tie_user_hash($domain, $user, "roles", 5658: &GDBM_READER()); 5659: 5660: # Author role should show up as a key /domain/_au 5661: 5662: my $key = "/$domain/_au"; 5663: my $value; 5664: if (defined($hashref)) { 5665: $value = $hashref->{$key}; 5666: } 5667: 5668: if(defined($value)) { 5669: &Debug("$user @ $domain is an author"); 5670: } 5671: 5672: return defined($value); 5673: } 5674: # 5675: # Checks to see if the input roleput request was to set 5676: # an author role. If so, invokes the lchtmldir script to set 5677: # up a correct public_html 5678: # Parameters: 5679: # request - The request sent to the rolesput subchunk. 5680: # We're looking for /domain/_au 5681: # domain - The domain in which the user is having roles doctored. 5682: # user - Name of the user for which the role is being put. 5683: # authtype - The authentication type associated with the user. 5684: # 5685: sub manage_permissions { 5686: my ($request, $domain, $user, $authtype) = @_; 5687: 5688: &Debug("manage_permissions: $request $domain $user $authtype"); 5689: 5690: # See if the request is of the form /$domain/_au 5691: if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput... 5692: my $execdir = $perlvar{'lonDaemons'}; 5693: my $userhome= "/home/$user" ; 5694: &logthis("system $execdir/lchtmldir $userhome $user $authtype"); 5695: &Debug("Setting homedir permissions for $userhome"); 5696: system("$execdir/lchtmldir $userhome $user $authtype"); 5697: } 5698: } 5699: 5700: 5701: # 5702: # Return the full path of a user password file, whether it exists or not. 5703: # Parameters: 5704: # domain - Domain in which the password file lives. 5705: # user - name of the user. 5706: # Returns: 5707: # Full passwd path: 5708: # 5709: sub password_path { 5710: my ($domain, $user) = @_; 5711: return &propath($domain, $user).'/passwd'; 5712: } 5713: 5714: # Password Filename 5715: # Returns the path to a passwd file given domain and user... only if 5716: # it exists. 5717: # Parameters: 5718: # domain - Domain in which to search. 5719: # user - username. 5720: # Returns: 5721: # - If the password file exists returns its path. 5722: # - If the password file does not exist, returns undefined. 5723: # 5724: sub password_filename { 5725: my ($domain, $user) = @_; 5726: 5727: Debug ("PasswordFilename called: dom = $domain user = $user"); 5728: 5729: my $path = &password_path($domain, $user); 5730: Debug("PasswordFilename got path: $path"); 5731: if(-e $path) { 5732: return $path; 5733: } else { 5734: return undef; 5735: } 5736: } 5737: 5738: # 5739: # Rewrite the contents of the user's passwd file. 5740: # Parameters: 5741: # domain - domain of the user. 5742: # name - User's name. 5743: # contents - New contents of the file. 5744: # Returns: 5745: # 0 - Failed. 5746: # 1 - Success. 5747: # 5748: sub rewrite_password_file { 5749: my ($domain, $user, $contents) = @_; 5750: 5751: my $file = &password_filename($domain, $user); 5752: if (defined $file) { 5753: my $pf = IO::File->new(">$file"); 5754: if($pf) { 5755: print $pf "$contents\n"; 5756: return 1; 5757: } else { 5758: return 0; 5759: } 5760: } else { 5761: return 0; 5762: } 5763: 5764: } 5765: 5766: # 5767: # get_auth_type - Determines the authorization type of a user in a domain. 5768: 5769: # Returns the authorization type or nouser if there is no such user. 5770: # 5771: sub get_auth_type 5772: { 5773: 5774: my ($domain, $user) = @_; 5775: 5776: Debug("get_auth_type( $domain, $user ) \n"); 5777: my $proname = &propath($domain, $user); 5778: my $passwdfile = "$proname/passwd"; 5779: if( -e $passwdfile ) { 5780: my $pf = IO::File->new($passwdfile); 5781: my $realpassword = <$pf>; 5782: chomp($realpassword); 5783: Debug("Password info = $realpassword\n"); 5784: my ($authtype, $contentpwd) = split(/:/, $realpassword); 5785: Debug("Authtype = $authtype, content = $contentpwd\n"); 5786: return "$authtype:$contentpwd"; 5787: } else { 5788: Debug("Returning nouser"); 5789: return "nouser"; 5790: } 5791: } 5792: 5793: # 5794: # Validate a user given their domain, name and password. This utility 5795: # function is used by both AuthenticateHandler and ChangePasswordHandler 5796: # to validate the login credentials of a user. 5797: # Parameters: 5798: # $domain - The domain being logged into (this is required due to 5799: # the capability for multihomed systems. 5800: # $user - The name of the user being validated. 5801: # $password - The user's propoposed password. 5802: # 5803: # Returns: 5804: # 1 - The domain,user,pasword triplet corresponds to a valid 5805: # user. 5806: # 0 - The domain,user,password triplet is not a valid user. 5807: # 5808: sub validate_user { 5809: my ($domain, $user, $password) = @_; 5810: 5811: 5812: # Why negative ~pi you may well ask? Well this function is about 5813: # authentication, and therefore very important to get right. 5814: # I've initialized the flag that determines whether or not I've 5815: # validated correctly to a value it's not supposed to get. 5816: # At the end of this function. I'll ensure that it's not still that 5817: # value so we don't just wind up returning some accidental value 5818: # as a result of executing an unforseen code path that 5819: # did not set $validated. At the end of valid execution paths, 5820: # validated shoule be 1 for success or 0 for failuer. 5821: 5822: my $validated = -3.14159; 5823: 5824: # How we authenticate is determined by the type of authentication 5825: # the user has been assigned. If the authentication type is 5826: # "nouser", the user does not exist so we will return 0. 5827: 5828: my $contents = &get_auth_type($domain, $user); 5829: my ($howpwd, $contentpwd) = split(/:/, $contents); 5830: 5831: my $null = pack("C",0); # Used by kerberos auth types. 5832: 5833: if ($howpwd ne 'nouser') { 5834: 5835: if($howpwd eq "internal") { # Encrypted is in local password file. 5836: $validated = (crypt($password, $contentpwd) eq $contentpwd); 5837: } 5838: elsif ($howpwd eq "unix") { # User is a normal unix user. 5839: $contentpwd = (getpwnam($user))[1]; 5840: if($contentpwd) { 5841: if($contentpwd eq 'x') { # Shadow password file... 5842: my $pwauth_path = "/usr/local/sbin/pwauth"; 5843: open PWAUTH, "|$pwauth_path" or 5844: die "Cannot invoke authentication"; 5845: print PWAUTH "$user\n$password\n"; 5846: close PWAUTH; 5847: $validated = ! $?; 5848: 5849: } else { # Passwords in /etc/passwd. 5850: $validated = (crypt($password, 5851: $contentpwd) eq $contentpwd); 5852: } 5853: } else { 5854: $validated = 0; 5855: } 5856: } 5857: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain. 5858: if(! ($password =~ /$null/) ) { 5859: my $k4error = &Authen::Krb4::get_pw_in_tkt($user, 5860: "", 5861: $contentpwd,, 5862: 'krbtgt', 5863: $contentpwd, 5864: 1, 5865: $password); 5866: if(!$k4error) { 5867: $validated = 1; 5868: } else { 5869: $validated = 0; 5870: &logthis('krb4: '.$user.', '.$contentpwd.', '. 5871: &Authen::Krb4::get_err_txt($Authen::Krb4::error)); 5872: } 5873: } else { 5874: $validated = 0; # Password has a match with null. 5875: } 5876: } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain. 5877: if(!($password =~ /$null/)) { # Null password not allowed. 5878: my $krbclient = &Authen::Krb5::parse_name($user.'@' 5879: .$contentpwd); 5880: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd; 5881: my $krbserver = &Authen::Krb5::parse_name($krbservice); 5882: my $credentials= &Authen::Krb5::cc_default(); 5883: $credentials->initialize(&Authen::Krb5::parse_name($user.'@' 5884: .$contentpwd)); 5885: my $krbreturn = &Authen::Krb5::get_in_tkt_with_password($krbclient, 5886: $krbserver, 5887: $password, 5888: $credentials); 5889: $validated = ($krbreturn == 1); 5890: } else { 5891: $validated = 0; 5892: } 5893: } elsif ($howpwd eq "localauth") { 5894: # Authenticate via installation specific authentcation method: 5895: $validated = &localauth::localauth($user, 5896: $password, 5897: $contentpwd, 5898: $domain); 5899: if ($validated < 0) { 5900: &logthis("localauth for $contentpwd $user:$domain returned a $validated"); 5901: $validated = 0; 5902: } 5903: } else { # Unrecognized auth is also bad. 5904: $validated = 0; 5905: } 5906: } else { 5907: $validated = 0; 5908: } 5909: # 5910: # $validated has the correct stat of the authentication: 5911: # 5912: 5913: unless ($validated != -3.14159) { 5914: # I >really really< want to know if this happens. 5915: # since it indicates that user authentication is badly 5916: # broken in some code path. 5917: # 5918: die "ValidateUser - failed to set the value of validated $domain, $user $password"; 5919: } 5920: return $validated; 5921: } 5922: 5923: 5924: sub addline { 5925: my ($fname,$hostid,$ip,$newline)=@_; 5926: my $contents; 5927: my $found=0; 5928: my $expr='^'.quotemeta($hostid).':'.quotemeta($ip).':'; 5929: my $sh; 5930: if ($sh=IO::File->new("$fname.subscription")) { 5931: while (my $subline=<$sh>) { 5932: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;} 5933: } 5934: $sh->close(); 5935: } 5936: $sh=IO::File->new(">$fname.subscription"); 5937: if ($contents) { print $sh $contents; } 5938: if ($newline) { print $sh $newline; } 5939: $sh->close(); 5940: return $found; 5941: } 5942: 5943: sub get_chat { 5944: my ($cdom,$cname,$udom,$uname,$group)=@_; 5945: 5946: my @entries=(); 5947: my $namespace = 'nohist_chatroom'; 5948: my $namespace_inroom = 'nohist_inchatroom'; 5949: if ($group ne '') { 5950: $namespace .= '_'.$group; 5951: $namespace_inroom .= '_'.$group; 5952: } 5953: my $hashref = &tie_user_hash($cdom, $cname, $namespace, 5954: &GDBM_READER()); 5955: if ($hashref) { 5956: @entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref)); 5957: &untie_user_hash($hashref); 5958: } 5959: my @participants=(); 5960: my $cutoff=time-60; 5961: $hashref = &tie_user_hash($cdom, $cname, $namespace_inroom, 5962: &GDBM_WRCREAT()); 5963: if ($hashref) { 5964: $hashref->{$uname.':'.$udom}=time; 5965: foreach my $user (sort(keys(%$hashref))) { 5966: if ($hashref->{$user}>$cutoff) { 5967: push(@participants, 'active_participant:'.$user); 5968: } 5969: } 5970: &untie_user_hash($hashref); 5971: } 5972: return (@participants,@entries); 5973: } 5974: 5975: sub chat_add { 5976: my ($cdom,$cname,$newchat,$group)=@_; 5977: my @entries=(); 5978: my $time=time; 5979: my $namespace = 'nohist_chatroom'; 5980: my $logfile = 'chatroom.log'; 5981: if ($group ne '') { 5982: $namespace .= '_'.$group; 5983: $logfile = 'chatroom_'.$group.'.log'; 5984: } 5985: my $hashref = &tie_user_hash($cdom, $cname, $namespace, 5986: &GDBM_WRCREAT()); 5987: if ($hashref) { 5988: @entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref)); 5989: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/); 5990: my ($thentime,$idnum)=split(/\_/,$lastid); 5991: my $newid=$time.'_000000'; 5992: if ($thentime==$time) { 5993: $idnum=~s/^0+//; 5994: $idnum++; 5995: $idnum=substr('000000'.$idnum,-6,6); 5996: $newid=$time.'_'.$idnum; 5997: } 5998: $hashref->{$newid}=$newchat; 5999: my $expired=$time-3600; 6000: foreach my $comment (keys(%$hashref)) { 6001: my ($thistime) = ($comment=~/(\d+)\_/); 6002: if ($thistime<$expired) { 6003: delete $hashref->{$comment}; 6004: } 6005: } 6006: { 6007: my $proname=&propath($cdom,$cname); 6008: if (open(CHATLOG,">>$proname/$logfile")) { 6009: print CHATLOG ("$time:".&unescape($newchat)."\n"); 6010: } 6011: close(CHATLOG); 6012: } 6013: &untie_user_hash($hashref); 6014: } 6015: } 6016: 6017: sub unsub { 6018: my ($fname,$clientip)=@_; 6019: my $result; 6020: my $unsubs = 0; # Number of successful unsubscribes: 6021: 6022: 6023: # An old way subscriptions were handled was to have a 6024: # subscription marker file: 6025: 6026: Debug("Attempting unlink of $fname.$clientname"); 6027: if (unlink("$fname.$clientname")) { 6028: $unsubs++; # Successful unsub via marker file. 6029: } 6030: 6031: # The more modern way to do it is to have a subscription list 6032: # file: 6033: 6034: if (-e "$fname.subscription") { 6035: my $found=&addline($fname,$clientname,$clientip,''); 6036: if ($found) { 6037: $unsubs++; 6038: } 6039: } 6040: 6041: # If either or both of these mechanisms succeeded in unsubscribing a 6042: # resource we can return ok: 6043: 6044: if($unsubs) { 6045: $result = "ok\n"; 6046: } else { 6047: $result = "not_subscribed\n"; 6048: } 6049: 6050: return $result; 6051: } 6052: 6053: sub currentversion { 6054: my $fname=shift; 6055: my $version=-1; 6056: my $ulsdir=''; 6057: if ($fname=~/^(.+)\/[^\/]+$/) { 6058: $ulsdir=$1; 6059: } 6060: my ($fnamere1,$fnamere2); 6061: # remove version if already specified 6062: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/; 6063: # get the bits that go before and after the version number 6064: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) { 6065: $fnamere1=$1; 6066: $fnamere2='.'.$2; 6067: } 6068: if (-e $fname) { $version=1; } 6069: if (-e $ulsdir) { 6070: if(-d $ulsdir) { 6071: if (opendir(LSDIR,$ulsdir)) { 6072: my $ulsfn; 6073: while ($ulsfn=readdir(LSDIR)) { 6074: # see if this is a regular file (ignore links produced earlier) 6075: my $thisfile=$ulsdir.'/'.$ulsfn; 6076: unless (-l $thisfile) { 6077: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) { 6078: if ($1>$version) { $version=$1; } 6079: } 6080: } 6081: } 6082: closedir(LSDIR); 6083: $version++; 6084: } 6085: } 6086: } 6087: return $version; 6088: } 6089: 6090: sub thisversion { 6091: my $fname=shift; 6092: my $version=-1; 6093: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) { 6094: $version=$1; 6095: } 6096: return $version; 6097: } 6098: 6099: sub subscribe { 6100: my ($userinput,$clientip)=@_; 6101: my $result; 6102: my ($cmd,$fname)=split(/:/,$userinput,2); 6103: my $ownership=&ishome($fname); 6104: if ($ownership eq 'owner') { 6105: # explitly asking for the current version? 6106: unless (-e $fname) { 6107: my $currentversion=&currentversion($fname); 6108: if (&thisversion($fname)==$currentversion) { 6109: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) { 6110: my $root=$1; 6111: my $extension=$2; 6112: symlink($root.'.'.$extension, 6113: $root.'.'.$currentversion.'.'.$extension); 6114: unless ($extension=~/\.meta$/) { 6115: symlink($root.'.'.$extension.'.meta', 6116: $root.'.'.$currentversion.'.'.$extension.'.meta'); 6117: } 6118: } 6119: } 6120: } 6121: if (-e $fname) { 6122: if (-d $fname) { 6123: $result="directory\n"; 6124: } else { 6125: if (-e "$fname.$clientname") {&unsub($fname,$clientip);} 6126: my $now=time; 6127: my $found=&addline($fname,$clientname,$clientip, 6128: "$clientname:$clientip:$now\n"); 6129: if ($found) { $result="$fname\n"; } 6130: # if they were subscribed to only meta data, delete that 6131: # subscription, when you subscribe to a file you also get 6132: # the metadata 6133: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); } 6134: $fname=~s/\/home\/httpd\/html\/res/raw/; 6135: $fname="http://$thisserver/".$fname; 6136: $result="$fname\n"; 6137: } 6138: } else { 6139: $result="not_found\n"; 6140: } 6141: } else { 6142: $result="rejected\n"; 6143: } 6144: return $result; 6145: } 6146: # Change the passwd of a unix user. The caller must have 6147: # first verified that the user is a loncapa user. 6148: # 6149: # Parameters: 6150: # user - Unix user name to change. 6151: # pass - New password for the user. 6152: # Returns: 6153: # ok - if success 6154: # other - Some meaningfule error message string. 6155: # NOTE: 6156: # invokes a setuid script to change the passwd. 6157: sub change_unix_password { 6158: my ($user, $pass) = @_; 6159: 6160: &Debug("change_unix_password"); 6161: my $execdir=$perlvar{'lonDaemons'}; 6162: &Debug("Opening lcpasswd pipeline"); 6163: my $pf = IO::File->new("|$execdir/lcpasswd > " 6164: ."$perlvar{'lonDaemons'}" 6165: ."/logs/lcpasswd.log"); 6166: print $pf "$user\n$pass\n$pass\n"; 6167: close $pf; 6168: my $err = $?; 6169: return ($err < @passwderrors) ? $passwderrors[$err] : 6170: "pwchange_falure - unknown error"; 6171: 6172: 6173: } 6174: 6175: 6176: sub make_passwd_file { 6177: my ($uname, $umode,$npass,$passfilename)=@_; 6178: my $result="ok\n"; 6179: if ($umode eq 'krb4' or $umode eq 'krb5') { 6180: { 6181: my $pf = IO::File->new(">$passfilename"); 6182: if ($pf) { 6183: print $pf "$umode:$npass\n"; 6184: } else { 6185: $result = "pass_file_failed_error"; 6186: } 6187: } 6188: } elsif ($umode eq 'internal') { 6189: my $salt=time; 6190: $salt=substr($salt,6,2); 6191: my $ncpass=crypt($npass,$salt); 6192: { 6193: &Debug("Creating internal auth"); 6194: my $pf = IO::File->new(">$passfilename"); 6195: if($pf) { 6196: print $pf "internal:$ncpass\n"; 6197: } else { 6198: $result = "pass_file_failed_error"; 6199: } 6200: } 6201: } elsif ($umode eq 'localauth') { 6202: { 6203: my $pf = IO::File->new(">$passfilename"); 6204: if($pf) { 6205: print $pf "localauth:$npass\n"; 6206: } else { 6207: $result = "pass_file_failed_error"; 6208: } 6209: } 6210: } elsif ($umode eq 'unix') { 6211: { 6212: # 6213: # Don't allow the creation of privileged accounts!!! that would 6214: # be real bad!!! 6215: # 6216: my $uid = getpwnam($uname); 6217: if((defined $uid) && ($uid == 0)) { 6218: &logthis(">>>Attempted to create privilged account blocked"); 6219: return "no_priv_account_error\n"; 6220: } 6221: 6222: my $execpath ="$perlvar{'lonDaemons'}/"."lcuseradd"; 6223: 6224: my $lc_error_file = $execdir."/tmp/lcuseradd".$$.".status"; 6225: { 6226: &Debug("Executing external: ".$execpath); 6227: &Debug("user = ".$uname.", Password =". $npass); 6228: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log"); 6229: print $se "$uname\n"; 6230: print $se "$npass\n"; 6231: print $se "$npass\n"; 6232: print $se "$lc_error_file\n"; # Status -> unique file. 6233: } 6234: if (-r $lc_error_file) { 6235: &Debug("Opening error file: $lc_error_file"); 6236: my $error = IO::File->new("< $lc_error_file"); 6237: my $useraddok = <$error>; 6238: $error->close; 6239: unlink($lc_error_file); 6240: 6241: chomp $useraddok; 6242: 6243: if($useraddok > 0) { 6244: my $error_text = &lcuseraddstrerror($useraddok); 6245: &logthis("Failed lcuseradd: $error_text"); 6246: $result = "lcuseradd_failed:$error_text\n"; 6247: } else { 6248: my $pf = IO::File->new(">$passfilename"); 6249: if($pf) { 6250: print $pf "unix:\n"; 6251: } else { 6252: $result = "pass_file_failed_error"; 6253: } 6254: } 6255: } else { 6256: &Debug("Could not locate lcuseradd error: $lc_error_file"); 6257: $result="bug_lcuseradd_no_output_file"; 6258: } 6259: } 6260: } elsif ($umode eq 'none') { 6261: { 6262: my $pf = IO::File->new("> $passfilename"); 6263: if($pf) { 6264: print $pf "none:\n"; 6265: } else { 6266: $result = "pass_file_failed_error"; 6267: } 6268: } 6269: } else { 6270: $result="auth_mode_error\n"; 6271: } 6272: return $result; 6273: } 6274: 6275: sub convert_photo { 6276: my ($start,$dest)=@_; 6277: system("convert $start $dest"); 6278: } 6279: 6280: sub sethost { 6281: my ($remotereq) = @_; 6282: my (undef,$hostid)=split(/:/,$remotereq); 6283: # ignore sethost if we are already correct 6284: if ($hostid eq $currenthostid) { 6285: return 'ok'; 6286: } 6287: 6288: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; } 6289: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) { 6290: $currenthostid =$hostid; 6291: $currentdomainid=$hostdom{$hostid}; 6292: &logthis("Setting hostid to $hostid, and domain to $currentdomainid"); 6293: } else { 6294: &logthis("Requested host id $hostid not an alias of ". 6295: $perlvar{'lonHostID'}." refusing connection"); 6296: return 'unable_to_set'; 6297: } 6298: return 'ok'; 6299: } 6300: 6301: sub version { 6302: my ($userinput)=@_; 6303: $remoteVERSION=(split(/:/,$userinput))[1]; 6304: return "version:$VERSION"; 6305: } 6306: 6307: #There is a copy of this in lonnet.pm 6308: sub userload { 6309: my $numusers=0; 6310: { 6311: opendir(LONIDS,$perlvar{'lonIDsDir'}); 6312: my $filename; 6313: my $curtime=time; 6314: while ($filename=readdir(LONIDS)) { 6315: if ($filename eq '.' || $filename eq '..') {next;} 6316: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9]; 6317: if ($curtime-$mtime < 1800) { $numusers++; } 6318: } 6319: closedir(LONIDS); 6320: } 6321: my $userloadpercent=0; 6322: my $maxuserload=$perlvar{'lonUserLoadLim'}; 6323: if ($maxuserload) { 6324: $userloadpercent=100*$numusers/$maxuserload; 6325: } 6326: $userloadpercent=sprintf("%.2f",$userloadpercent); 6327: return $userloadpercent; 6328: } 6329: 6330: # Routines for serializing arrays and hashes (copies from lonnet) 6331: 6332: sub array2str { 6333: my (@array) = @_; 6334: my $result=&arrayref2str(\@array); 6335: $result=~s/^__ARRAY_REF__//; 6336: $result=~s/__END_ARRAY_REF__$//; 6337: return $result; 6338: } 6339: 6340: sub arrayref2str { 6341: my ($arrayref) = @_; 6342: my $result='__ARRAY_REF__'; 6343: foreach my $elem (@$arrayref) { 6344: if(ref($elem) eq 'ARRAY') { 6345: $result.=&arrayref2str($elem).'&'; 6346: } elsif(ref($elem) eq 'HASH') { 6347: $result.=&hashref2str($elem).'&'; 6348: } elsif(ref($elem)) { 6349: #print("Got a ref of ".(ref($elem))." skipping."); 6350: } else { 6351: $result.=&escape($elem).'&'; 6352: } 6353: } 6354: $result=~s/\&$//; 6355: $result .= '__END_ARRAY_REF__'; 6356: return $result; 6357: } 6358: 6359: sub hash2str { 6360: my (%hash) = @_; 6361: my $result=&hashref2str(\%hash); 6362: $result=~s/^__HASH_REF__//; 6363: $result=~s/__END_HASH_REF__$//; 6364: return $result; 6365: } 6366: 6367: sub hashref2str { 6368: my ($hashref)=@_; 6369: my $result='__HASH_REF__'; 6370: foreach (sort(keys(%$hashref))) { 6371: if (ref($_) eq 'ARRAY') { 6372: $result.=&arrayref2str($_).'='; 6373: } elsif (ref($_) eq 'HASH') { 6374: $result.=&hashref2str($_).'='; 6375: } elsif (ref($_)) { 6376: $result.='='; 6377: #print("Got a ref of ".(ref($_))." skipping."); 6378: } else { 6379: if ($_) {$result.=&escape($_).'=';} else { last; } 6380: } 6381: 6382: if(ref($hashref->{$_}) eq 'ARRAY') { 6383: $result.=&arrayref2str($hashref->{$_}).'&'; 6384: } elsif(ref($hashref->{$_}) eq 'HASH') { 6385: $result.=&hashref2str($hashref->{$_}).'&'; 6386: } elsif(ref($hashref->{$_})) { 6387: $result.='&'; 6388: #print("Got a ref of ".(ref($hashref->{$_}))." skipping."); 6389: } else { 6390: $result.=&escape($hashref->{$_}).'&'; 6391: } 6392: } 6393: $result=~s/\&$//; 6394: $result .= '__END_HASH_REF__'; 6395: return $result; 6396: } 6397: 6398: # ----------------------------------- POD (plain old documentation, CPAN style) 6399: 6400: =head1 NAME 6401: 6402: lond - "LON Daemon" Server (port "LOND" 5663) 6403: 6404: =head1 SYNOPSIS 6405: 6406: Usage: B<lond> 6407: 6408: Should only be run as user=www. This is a command-line script which 6409: is invoked by B<loncron>. There is no expectation that a typical user 6410: will manually start B<lond> from the command-line. (In other words, 6411: DO NOT START B<lond> YOURSELF.) 6412: 6413: =head1 DESCRIPTION 6414: 6415: There are two characteristics associated with the running of B<lond>, 6416: PROCESS MANAGEMENT (starting, stopping, handling child processes) 6417: and SERVER-SIDE ACTIVITIES (password authentication, user creation, 6418: subscriptions, etc). These are described in two large 6419: sections below. 6420: 6421: B<PROCESS MANAGEMENT> 6422: 6423: Preforker - server who forks first. Runs as a daemon. HUPs. 6424: Uses IDEA encryption 6425: 6426: B<lond> forks off children processes that correspond to the other servers 6427: in the network. Management of these processes can be done at the 6428: parent process level or the child process level. 6429: 6430: B<logs/lond.log> is the location of log messages. 6431: 6432: The process management is now explained in terms of linux shell commands, 6433: subroutines internal to this code, and signal assignments: 6434: 6435: =over 4 6436: 6437: =item * 6438: 6439: PID is stored in B<logs/lond.pid> 6440: 6441: This is the process id number of the parent B<lond> process. 6442: 6443: =item * 6444: 6445: SIGTERM and SIGINT 6446: 6447: Parent signal assignment: 6448: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN; 6449: 6450: Child signal assignment: 6451: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also) 6452: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber 6453: to restart a new child.) 6454: 6455: Command-line invocations: 6456: B<kill> B<-s> SIGTERM I<PID> 6457: B<kill> B<-s> SIGINT I<PID> 6458: 6459: Subroutine B<HUNTSMAN>: 6460: This is only invoked for the B<lond> parent I<PID>. 6461: This kills all the children, and then the parent. 6462: The B<lonc.pid> file is cleared. 6463: 6464: =item * 6465: 6466: SIGHUP 6467: 6468: Current bug: 6469: This signal can only be processed the first time 6470: on the parent process. Subsequent SIGHUP signals 6471: have no effect. 6472: 6473: Parent signal assignment: 6474: $SIG{HUP} = \&HUPSMAN; 6475: 6476: Child signal assignment: 6477: none (nothing happens) 6478: 6479: Command-line invocations: 6480: B<kill> B<-s> SIGHUP I<PID> 6481: 6482: Subroutine B<HUPSMAN>: 6483: This is only invoked for the B<lond> parent I<PID>, 6484: This kills all the children, and then the parent. 6485: The B<lond.pid> file is cleared. 6486: 6487: =item * 6488: 6489: SIGUSR1 6490: 6491: Parent signal assignment: 6492: $SIG{USR1} = \&USRMAN; 6493: 6494: Child signal assignment: 6495: $SIG{USR1}= \&logstatus; 6496: 6497: Command-line invocations: 6498: B<kill> B<-s> SIGUSR1 I<PID> 6499: 6500: Subroutine B<USRMAN>: 6501: When invoked for the B<lond> parent I<PID>, 6502: SIGUSR1 is sent to all the children, and the status of 6503: each connection is logged. 6504: 6505: =item * 6506: 6507: SIGUSR2 6508: 6509: Parent Signal assignment: 6510: $SIG{USR2} = \&UpdateHosts 6511: 6512: Child signal assignment: 6513: NONE 6514: 6515: 6516: =item * 6517: 6518: SIGCHLD 6519: 6520: Parent signal assignment: 6521: $SIG{CHLD} = \&REAPER; 6522: 6523: Child signal assignment: 6524: none 6525: 6526: Command-line invocations: 6527: B<kill> B<-s> SIGCHLD I<PID> 6528: 6529: Subroutine B<REAPER>: 6530: This is only invoked for the B<lond> parent I<PID>. 6531: Information pertaining to the child is removed. 6532: The socket port is cleaned up. 6533: 6534: =back 6535: 6536: B<SERVER-SIDE ACTIVITIES> 6537: 6538: Server-side information can be accepted in an encrypted or non-encrypted 6539: method. 6540: 6541: =over 4 6542: 6543: =item ping 6544: 6545: Query a client in the hosts.tab table; "Are you there?" 6546: 6547: =item pong 6548: 6549: Respond to a ping query. 6550: 6551: =item ekey 6552: 6553: Read in encrypted key, make cipher. Respond with a buildkey. 6554: 6555: =item load 6556: 6557: Respond with CPU load based on a computation upon /proc/loadavg. 6558: 6559: =item currentauth 6560: 6561: Reply with current authentication information (only over an 6562: encrypted channel). 6563: 6564: =item auth 6565: 6566: Only over an encrypted channel, reply as to whether a user's 6567: authentication information can be validated. 6568: 6569: =item passwd 6570: 6571: Allow for a password to be set. 6572: 6573: =item makeuser 6574: 6575: Make a user. 6576: 6577: =item passwd 6578: 6579: Allow for authentication mechanism and password to be changed. 6580: 6581: =item home 6582: 6583: Respond to a question "are you the home for a given user?" 6584: 6585: =item update 6586: 6587: Update contents of a subscribed resource. 6588: 6589: =item unsubscribe 6590: 6591: The server is unsubscribing from a resource. 6592: 6593: =item subscribe 6594: 6595: The server is subscribing to a resource. 6596: 6597: =item log 6598: 6599: Place in B<logs/lond.log> 6600: 6601: =item put 6602: 6603: stores hash in namespace 6604: 6605: =item rolesputy 6606: 6607: put a role into a user's environment 6608: 6609: =item get 6610: 6611: returns hash with keys from array 6612: reference filled in from namespace 6613: 6614: =item eget 6615: 6616: returns hash with keys from array 6617: reference filled in from namesp (encrypts the return communication) 6618: 6619: =item rolesget 6620: 6621: get a role from a user's environment 6622: 6623: =item del 6624: 6625: deletes keys out of array from namespace 6626: 6627: =item keys 6628: 6629: returns namespace keys 6630: 6631: =item dump 6632: 6633: dumps the complete (or key matching regexp) namespace into a hash 6634: 6635: =item store 6636: 6637: stores hash permanently 6638: for this url; hashref needs to be given and should be a \%hashname; the 6639: remaining args aren't required and if they aren't passed or are '' they will 6640: be derived from the ENV 6641: 6642: =item restore 6643: 6644: returns a hash for a given url 6645: 6646: =item querysend 6647: 6648: Tells client about the lonsql process that has been launched in response 6649: to a sent query. 6650: 6651: =item queryreply 6652: 6653: Accept information from lonsql and make appropriate storage in temporary 6654: file space. 6655: 6656: =item idput 6657: 6658: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers 6659: for each student, defined perhaps by the institutional Registrar.) 6660: 6661: =item idget 6662: 6663: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers 6664: for each student, defined perhaps by the institutional Registrar.) 6665: 6666: =item tmpput 6667: 6668: Accept and store information in temporary space. 6669: 6670: =item tmpget 6671: 6672: Send along temporarily stored information. 6673: 6674: =item ls 6675: 6676: List part of a user's directory. 6677: 6678: =item pushtable 6679: 6680: Pushes a file in /home/httpd/lonTab directory. Currently limited to: 6681: hosts.tab and domain.tab. The old file is copied to *.tab.backup but 6682: must be restored manually in case of a problem with the new table file. 6683: pushtable requires that the request be encrypted and validated via 6684: ValidateManager. The form of the command is: 6685: enc:pushtable tablename <tablecontents> \n 6686: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 6687: cleartext newline. 6688: 6689: =item Hanging up (exit or init) 6690: 6691: What to do when a client tells the server that they (the client) 6692: are leaving the network. 6693: 6694: =item unknown command 6695: 6696: If B<lond> is sent an unknown command (not in the list above), 6697: it replys to the client "unknown_cmd". 6698: 6699: 6700: =item UNKNOWN CLIENT 6701: 6702: If the anti-spoofing algorithm cannot verify the client, 6703: the client is rejected (with a "refused" message sent 6704: to the client, and the connection is closed. 6705: 6706: =back 6707: 6708: =head1 PREREQUISITES 6709: 6710: IO::Socket 6711: IO::File 6712: Apache::File 6713: POSIX 6714: Crypt::IDEA 6715: LWP::UserAgent() 6716: GDBM_File 6717: Authen::Krb4 6718: Authen::Krb5 6719: 6720: =head1 COREQUISITES 6721: 6722: =head1 OSNAMES 6723: 6724: linux 6725: 6726: =head1 SCRIPT CATEGORIES 6727: 6728: Server/Process 6729: 6730: =cut