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Bug #34463 eval/new COM => hang on com_print_typeinfo
Submitted: 2005-09-11 14:40 UTC Modified: 2005-09-11 15:15 UTC
From: csaba at alum dot mit dot edu Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 5CVS-2005-09-11 (snap) OS:
Private report: No CVE-ID: None
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From: csaba at alum dot mit dot edu
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 [2005-09-11 14:40 UTC] csaba at alum dot mit dot edu
Description:
------------
If I do eval('$com=new COM("WScript.Shell");');
then gettype($com) is the empty string
while com_print_typeinfo($com) leads to the CLI / Apache error  dialog box asking whether I want to send Microsoft a report about it.

Nevertheless, the $com object is (at least somewhat) valid because I can subsequently (if I didn't do a com_print_typeinfo) do other things with it.  Thus, gettype is incorrect, and com_print_typeinfo should not crash PHP.

Csaba Gabor from Vienna
PS.  Uncomment any of the 3 new COM lines, and it runs
         as expected.
     Marked as a Scripting Engine Problem since the
         problem seems to start in the eval line.

Reproduce code:
---------------
<?php
print "<pre>\n";
$oEnv = newCOM("WScript.Shell")->Environment("process");
foreach ($oEnv as $idx=>$val) print "$idx: $val\n";
print "</pre>";

function newCOM($comSpec) {
  $eval = '$newCom = new COM("' . $comSpec . '");';
  print ("going to eval: $eval\n");
  try { eval($eval); }
  catch (Exception $e) {
    output("Could not load COM: $comSpec"); return null; }

//$newCOM = new COM("WScript.Shell");
//$newCOM = new COM(&$comSpec);
//$newCOM = new COM($comSpec);

  print "newCOM has gettype: " .  gettype($newCOM) . "\n";
  print "          typename: " . typename($newCOM) . "\n\n";
  com_print_typeinfo($newCOM);
  return $newCom;
}

function typename($objCOM) {
    if (is_null($objCOM)) return null;
    $oScript = new COM("MSScriptControl.ScriptControl");
    $oScript->language = "VBScript";
    $oScript->addObject("objCom",$objCOM);
    return $oScript->eval("typename(objCom)");
}
?>

Expected result:
----------------
After the 'going to eval' line, I expect to see:
newCOM has gettype: object
          typename: IWshShell3


Actual result:
--------------
newCOM has gettype: NULL
          typename: 

followed by a PHP crash

If you remove the com_print_typeinfo line, the rest of the code executes as expected.  In other words, the COM object functions so the gettype is still wrong.


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 [2005-09-11 15:15 UTC] csaba at alum dot mit dot edu
My apologies.  When you stare at $newCom and $newCOM they sometimes look the same, but they aren't.

Csaba

PS.  Sniper: now this report is one you could corrupt!
 
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