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Request #57880 Capturing output via exp_loguser from within PHP / Apache
Submitted: 2007-10-17 16:30 UTC Modified: 2007-10-20 03:18 UTC
From: maport1 at uky dot edu Assigned:
Status: Closed Package: expect (PECL)
PHP Version: 5.2.1 OS: Linux
Private report: No CVE-ID: None
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 [2007-10-17 16:30 UTC] maport1 at uky dot edu
Description:
------------
Is there a method so that the Expect library output (turned on via exp_loguser) is accessible to the calling script running with PHP as an Apache module?  For example, this would be used to display a telnet session trace when it has failed out.  In my testing, it appears that the output is sent to the php://stdout stream, and thus it is unavailable to the calling script within Apache.  I understand that exp_logfile can be set to redirect output to a file, but is it possible to somehow pass a flag so that the log is actually displayed in the php://output stream?  I would attempt this myself (as with the subpattern matching changes), but I don't understand enough of the underlying Zend streams model to join the output streams.

Reproduce code:
---------------
<?php
    ini_set("expect.loguser", 1);

    ob_start();

    print "Opening connection to localhost ...\n";
    $fp = fopen("expect://ssh 127.0.0.1", "r");

    . . . .

    fclose($fp);

    $trace = ob_get_contents();
?>

Expected result:
----------------
$trace contains the full output from Expect

Actual result:
--------------
$trace contains only output sent via the print and echo commands

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 [2007-10-17 17:30 UTC] maport1 at uky dot edu
Mark Frost and I created a patch that *appears* to work in the manner I was expecting.  It adds a fourth .ini boolean parameter, expect.logoutput, that passes the php://output stream to exp_logfile.  We would, however, appreciate a second eye checking for potential errors.

Here is the patch:

--- expect-0.2.3/expect.c       2006-07-05 10:51:56.000000000 -0400
+++ expect-0.2.4/expect.c       2007-10-17 17:19:40.000000000 -0400
@@ -82,7 +82,7 @@
        if (new_value_length > 0) {
                exp_logfile = fopen (new_value, "a");
                if (!exp_logfile) {
-                       php_error_docref (NULL TSRMLS_CC, E_ERROR, "could not open log file for writting");
+                       php_error_docref (NULL TSRMLS_CC, E_ERROR, "could not open log file for writing");
                        return FAILURE;
                }
        }
@@ -91,10 +91,27 @@
 /* }}} */
 
 
+/* {{{ PHP_INI_MH
+ *  */
+static PHP_INI_MH(OnSetExpectLogOutput)
+{
+       if (new_value) {
+               if (!strncasecmp("on", new_value, sizeof("on")) || atoi(new_value)) {
+                       php_stream *out = php_stream_open_wrapper("php://output", "w", 0, NULL);
+                       FILE * php_output;
+                       (void) php_stream_cast(out, PHP_STREAM_AS_STDIO, (void **) &php_output, REPORT_ERRORS);
+                       exp_logfile = php_output;
+               }
+       }
+}
+/* }}} */
+
+
 PHP_INI_BEGIN()
        PHP_INI_ENTRY("expect.timeout", "10", PHP_INI_ALL, OnSetExpectTimeout)
        PHP_INI_ENTRY_EX("expect.loguser", "1", PHP_INI_ALL, OnSetExpectLogUser, php_ini_boolean_displayer_cb)
        PHP_INI_ENTRY("expect.logfile", "", PHP_INI_ALL, OnSetExpectLogFile)
+       PHP_INI_ENTRY_EX("expect.logoutput", "0", PHP_INI_ALL, OnSetExpectLogOutput, php_ini_boolean_displayer_cb)
 PHP_INI_END()
 [2007-10-20 03:18 UTC] spektom at gmail dot com
Thank you for your bug report. This issue has been fixed
in the latest released version of the package, which you can download at
http://pecl.php.net/get/expect

Fixed in v.0.2.4

Use set_ini('expect.logfile', 'php://output') for re-directing expect output to output buffer mechanism.
 
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