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Improved blacklist
Modified sync: R turns long integers into scientific notation

    1: # The LearningOnline Network with CAPA
    2: # Interface routines to R CAS
    3: #
    4: # $Id: lonr.pm,v 1.3 2009/04/18 16:03:17 www Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28:  
   29: package Apache::lonr;
   30:  
   31: use strict;
   32: use IO::Socket;
   33: use Apache::lonnet;
   34: use Apache::response();
   35: use LONCAPA;
   36: 
   37: sub connect {
   38:    return IO::Socket::UNIX->new(Peer    => $Apache::lonnet::perlvar{'lonSockDir'}.'/rsock',
   39: 				Type    => SOCK_STREAM,
   40: 				Timeout => 10);
   41: }
   42: 
   43: sub disconnect {
   44:     my ($socket)=@_;
   45:     if ($socket) { close($socket); }
   46: }
   47: 
   48: sub rreply {
   49:     my ($socket,$cmd)=@_;
   50:     if ($socket) {
   51: 	print $socket &escape($cmd)."\n";
   52:         my $reply=<$socket>;
   53:         chomp($reply);
   54:         if ($reply=~/^Incorrect/) { $reply='Error: '.$reply; }
   55:         return &unescape($reply);
   56:     } else {
   57:         return 'Error: no connection.';
   58:     }
   59: }
   60: 
   61: sub blacklisted {
   62:     my ($cmd)=@_;
   63:     foreach my $forbidden (
   64:         'read','write','scan','save','socket','connections',
   65:         'open','close',
   66:         'plot','X11','windows','quartz',
   67:         'postscript','pdf','png','jpeg',
   68:         'dev\.list','dev\.next','dev\.prev','dev\.set',
   69:         'dev\.off','dev\.copy','dev\.print','graphics',
   70:         'library','package','source','sink','objects',
   71:      ) {
   72: 	if ($cmd=~/$forbidden/s) { return 1; }
   73:     } 
   74:     return 0;
   75: }
   76: 
   77: sub r_allowed_libraries {
   78:    return ('boot','class','cluster','datasets','KernSmooth','MASS',
   79:            'methods','mgcv','nlme','nnet','rpart','spatial',
   80:            'splines','stats','stats4','survival');
   81: }
   82: 
   83: sub r_is_allowed_library {
   84:     my ($library)=@_;
   85:     foreach my $allowed_library (&r_allowed_libraries()) {
   86:        if ($library eq $allowed_library) { return 1; }
   87:     }
   88:     return 0;
   89: }
   90: 
   91: sub runscript {
   92:     my ($socket,$fullscript,$libraries)=@_;
   93:     if (&blacklisted($fullscript)) { return 'Error: blacklisted'; }
   94:     my $reply;
   95:     $fullscript=~s/[\n\r\l]//gs;
   96:     if ($libraries) {
   97:        foreach my $library (split(/\s*\,\s*/,$libraries)) {
   98:           unless ($library=~/\w/) { next; }
   99:           if (&r_is_allowed_library($library)) {
  100:               $reply=&rreply($socket,'library('.$library.');'."\n");
  101:               if ($reply=~/^Error\:/) { return $reply; }
  102:           } else { 
  103:              return 'Error: blacklisted'; 
  104:           }
  105:        }
  106:     }
  107:     foreach my $line (split(/\;/s,$fullscript)) {
  108: 	if ($line=~/\w/) { $reply=&rreply($socket,$line.";\n"); }
  109: 	if ($reply=~/^Error\:/) { return $reply; }
  110:     }
  111:     $reply=~s/^\s*//gs;
  112:     $reply=~s/\s*$//gs;
  113:     &Apache::lonxml::debug("r $fullscript \n reply $reply");
  114:     return $reply;
  115: }
  116: 
  117: sub r_cas_formula_fix {
  118:    my ($expression)=@_;
  119:    return &Apache::response::implicit_multiplication($expression);
  120: }
  121: 
  122: sub r_run {
  123:     my ($script,$submission,$argument,$libraries) = @_;
  124:     my $socket=&connect();
  125:     my @submissionarray=split(/\s*\,\s*/,$submission);
  126:     for (my $i=0;$i<=$#submissionarray;$i++) {
  127:         my $n=$i+1;
  128:         my $fixedsubmission=&r_cas_formula_fix($submissionarray[$i]);
  129:         $script=~s/RESPONSE\[$n\]/$fixedsubmission/gs;
  130:     }
  131:     my @argumentarray=@{$argument};
  132:     for (my $i=0;$i<=$#argumentarray;$i++) {
  133:         my $n=$i+1;
  134:         my $fixedargument=&r_cas_formula_fix($argumentarray[$i]);
  135:         $script=~s/LONCAPALIST\[$n\]/$fixedargument/gs;
  136:     }
  137:     my $reply=&runscript($socket,$script,$libraries);
  138:     &disconnect($socket);
  139:     if ($reply=~/^\s*true\s*$/i) { return 'EXACT_ANS'; }
  140:     if ($reply=~/^\s*false\s*$/i) { return 'INCORRECT'; } 
  141:     return 'BAD_FORMULA';
  142: }
  143: 
  144: sub r_eval {
  145:     my ($script,$libraries) = @_;
  146:     my $socket=&connect();
  147:     my $reply=&runscript($socket,$script,$libraries);
  148:     &disconnect($socket);
  149:     return $reply;
  150: }
  151: 
  152: 
  153: sub compareterms {
  154:     my ($socket,$terma,$termb)=@_;
  155:     my $difference=$terma.'-('.$termb.')';
  156:     if (&blacklisted($difference)) { return 'Error: blacklisted'; }
  157:     my $reply=&rreply($socket,$difference.';');
  158:     if ($reply=~/^\s*0\s*$/) { return 'true'; }
  159:     if ($reply=~/^Error\:/) { return $reply; }
  160:     return 'false';
  161: }
  162: 
  163: sub r_check {
  164:     my ($response,$answer,$reterror) = @_;
  165:     my $socket=&connect();
  166:     my $reply=&compareterms($socket,$response,$answer);
  167:     &disconnect($socket);
  168:     # integer to string mappings come from capaParser.h
  169:     # 1 maps to 'EXACT_ANS'
  170:     if ($reply eq 'true') { return 1; }
  171:     # 11 maps to 'BAD_FORMULA'
  172:     if ($reply=~/^Error\:/) { return 11; }
  173:     # 7 maps to 'INCORRECT'
  174:     return 7;
  175: }
  176:  
  177: 1;
  178: __END__;