Bug #71070 [Opn]: Custom session handler write method returns false, warning message misleading

From: Date: Wed, 09 Dec 2015 15:02:39 +0000
Subject: Bug #71070 [Opn]: Custom session handler write method returns false, warning message misleading
References: 1  Groups: php.bugs 
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Edit report at https://bugs.php.net/bug.php?id=71070&edit=1

 ID:                 71070
 Updated by:         laruence@php.net
 Reported by:        claytonsmith at outlook dot com
 Summary:            Custom session handler write method returns false,
                     warning message misleading
 Status:             Open
 Type:               Bug
 Package:            Session related
 PHP Version:        Irrelevant
-Assigned To:        
+Assigned To:        yohgaki
 Block user comment: N
 Private report:     N

 New Comment:

We can not get the file/line info, instead we can only warn about write failed, however I am not
what message is better:
diff --git a/ext/session/session.c b/ext/session/session.c
index 5e4831c..6981b8f 100644
--- a/ext/session/session.c
+++ b/ext/session/session.c
@@ -572,11 +572,15 @@ static void php_session_save_current_state(int write) /* {{{ */
 			}
 
 			if ((ret == FAILURE) && !EG(exception)) {
-				php_error_docref(NULL, E_WARNING, "Failed to write session data (%s). Please "
-								 "verify that the current setting of session.save_path "
-								 "is correct (%s)",
-								 PS(mod)->s_name,
-								 PS(save_path));
+				if (!PS(mod_user_implemented)) {
+					php_error_docref(NULL, E_WARNING, "Failed to write session data (%s). Please "
+									 "verify that the current setting of session.save_path "
+									 "is correct (%s)",
+									 PS(mod)->s_name,
+									 PS(save_path));
+				} else {
+					php_error_docref(NULL, E_WARNING, "Failed to write session data (%s)",
PS(mod)->s_name);
+				}
 			}
 		}
 	}


thanks


Previous Comments:
------------------------------------------------------------------------
[2015-12-09 06:53:23] claytonsmith at outlook dot com

Description:
------------
When using a custom session handler it will generate a misleading error message about why the write
failed to happen.  It says to verify the session.save_path is correct but because we are using a
custom session handler, it may never be attempting to write to that directory.

Example of one user running into this problem:
http://stackoverflow.com/questions/34117651/php7-symfony-2-8-failed-to-write-session-data/

It would be better to have a more clear warning message to diagnose why this occurs.

Test script:
---------------
<?
error_reporting(E_ALL);
ini_set('display_errors', 1);

class TestHandler extends SessionHandler {
    public function write($id, $data) {
        // Write somewhere that is not a file
        return false;
    }
}

$saveHandler = new TestHandler();
session_set_save_handler(
	array(&$saveHandler, 'open'),
	array(&$saveHandler, 'close'),
	array(&$saveHandler, 'read'),
	array(&$saveHandler, 'write'),
	array(&$saveHandler, 'destroy'),
	array(&$saveHandler, 'gc')
);

session_start(); 

$_SESSION['value'] = 123;
var_dump($_SESSION);


Expected result:
----------------
PHP Warning:  Unknown: Failed to write session data using custom session handler in
custom-session-handler.php on line 123



Actual result:
--------------
 Warning: session_write_close(): Failed to write session data (user). Please verify that the current
setting of session.save_path is correct (/tmp)



------------------------------------------------------------------------



--
Edit this bug report at https://bugs.php.net/bug.php?id=71070&edit=1


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