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[2007-02-27 10:22 UTC] info at neo2enigma dot ir
Description:
------------
I'm using apd-0.9.2 on apache 2.2 and php 4.4.4 on Redhat AD 4
I can only use once override/rename_function.
I got this error in apache error_log:
rename_function(mysql_select_db,msssql_select_db) failed: mssql_select_db already exists! in /var/www/html/apd.php on line 4
rename_function(mysql_query,msssql_query) failed: mssql_select_db already exists! in /var/www/html/apd.php on line 7
mysql_query(): supplies resource is not a valid MySQL-Link resource in /var/ww/html/apd.php on line 8
rename_function(mysql_fetch_array,msssql_fetch_array) failed: mssql_select_db already exists! in /var/www/html/apd.php on line 9
mysql_fetch_array(): supplies resource is not a valid MySQL-Link resource in /var/ww/html/apd.php on line 10
and here is the source code:
<?php
override_function('mysql_connect', '$sis_host, $sis_user, $sis_pass', 'return mssql_connect($sis_host, $sis_user, $sis_pass);');
$lnk=mysql_connect('abc.abc.com','test','test') or die("Server Error!!");
rename_function('mysql_select_db', 'mssql_select_db');
$db=mssql_select_db('test',$lnk);
$q="select * from t1";
rename_function('mysql_query','mssql_query');
$result=mysql_query($q,$lnk);
rename_function('mysql_fetch_array', 'mssql_fetch_array');
while ($row = mysql_fetch_array($result))
{
echo $row['name']."<br>";
}
?>
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Last updated: Tue Apr 29 10:01:29 2025 UTC |
This is because APD uses the function name __overridden__ for overridden function (php_apd.c:607). I am not sure as to why they have done this, but it would be fairly simple to patch it to generate a random name for the function. On lines 610 and 611, there are two unused defined variable "temp_function_name" and "temp_function_name_length", it seems that these are intended for this exact use, but was never implemented. Here is a patch for this, however, my experience with C is very limited, and with the zend engine, even less. Someone with more experiance may want to review this patch first: --- orig.c 2008-06-17 10:27:26.000000000 +1000 +++ php_apd.c 2008-06-17 10:57:01.000000000 +1000 @@ -608,7 +608,7 @@ PHP_FUNCTION(override_function) { char *eval_code,*eval_name, *temp_function_name; - int eval_code_length, retval, temp_function_name_length; + int eval_code_length, retval, temp_function_name_length, i; zval **z_function_name, **z_function_args, **z_function_code; if (ZEND_NUM_ARGS() != 3 || @@ -622,13 +622,22 @@ convert_to_string_ex(z_function_args); convert_to_string_ex(z_function_code); - eval_code_length = sizeof("function " TEMP_OVRD_FUNC_NAME) + temp_function_name_length = sizeof(TEMP_OVRD_FUNC_NAME); + temp_function_name = (char *) emalloc(temp_function_name_length + 10); + sprintf(temp_function_name, "%s", TEMP_OVRD_FUNC_NAME); + for(i = 0; i < 10; i++) + temp_function_name[temp_function_name_length+i-1] = 97 + (rand() % 26); + temp_function_name_length += 10; + temp_function_name[temp_function_name_length-1] = 0; + + eval_code_length = sizeof("function ") + temp_function_name_length + Z_STRLEN_PP(z_function_args) + 2 /* parentheses */ + 2 /* curlies */ + Z_STRLEN_PP(z_function_code); eval_code = (char *) emalloc(eval_code_length); - sprintf(eval_code, "function " TEMP_OVRD_FUNC_NAME "(%s){%s}", + sprintf(eval_code, "function %s (%s){%s}", + temp_function_name, Z_STRVAL_PP(z_function_args), Z_STRVAL_PP(z_function_code)); eval_name = zend_make_compiled_string_description("runtime-created override function" TSRMLS_CC); retval = zend_eval_string(eval_code, NULL, eval_name TSRMLS_CC); @@ -638,12 +647,14 @@ if (retval == SUCCESS) { zend_function *func; - if (zend_hash_find(EG(function_table), TEMP_OVRD_FUNC_NAME, - sizeof(TEMP_OVRD_FUNC_NAME), (void **) &func) == FAILURE) + if (zend_hash_find(EG(function_table), temp_function_name, + temp_function_name_length, (void **) &func) == FAILURE) { zend_error(E_ERROR, "%s() temporary function name not present in global function_table", get_active_function_name(TSRMLS_C)); + efree(temp_function_name); RETURN_FALSE; } + efree(temp_function_name); function_add_ref(func); zend_hash_del(EG(function_table), Z_STRVAL_PP(z_function_name), Z_STRLEN_PP(z_function_name) + 1); @@ -656,6 +667,7 @@ RETURN_TRUE; } else { + efree(temp_function_name); RETURN_FALSE; } }