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|
/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2010 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: John Coggeshall <john@php.net> |
| Wez Furlong <wez@thebrainroom.com> |
+----------------------------------------------------------------------+
*/
/* $Id: sess_sqlite.c 293036 2010-01-03 09:23:27Z sebastian $ */
#include "php.h"
#if HAVE_PHP_SESSION && !defined(COMPILE_DL_SESSION)
#include "ext/session/php_session.h"
#include "ext/standard/php_lcg.h"
#include <sqlite.h>
#define SQLITE_RETVAL(__r) ((__r) == SQLITE_OK ? SUCCESS : FAILURE)
#define PS_SQLITE_DATA sqlite *db = (sqlite*)PS_GET_MOD_DATA()
extern int sqlite_encode_binary(const unsigned char *in, int n, unsigned char *out);
extern int sqlite_decode_binary(const unsigned char *in, unsigned char *out);
PS_FUNCS(sqlite);
ps_module ps_mod_sqlite = {
PS_MOD(sqlite)
};
PS_OPEN_FUNC(sqlite)
{
char *errmsg = NULL;
sqlite *db;
/* TODO: do we need a safe_mode check here? */
db = sqlite_open(save_path, 0666, &errmsg);
if (db == NULL) {
php_error_docref(NULL TSRMLS_CC, E_WARNING,
"SQLite: failed to open/create session database `%s' - %s", save_path, errmsg);
sqlite_freemem(errmsg);
return FAILURE;
}
/* allow up to 1 minute when busy */
sqlite_busy_timeout(db, 60000);
sqlite_exec(db, "PRAGMA default_synchronous = OFF", NULL, NULL, NULL);
sqlite_exec(db, "PRAGMA count_changes = OFF", NULL, NULL, NULL);
/* This will fail if the table already exists, but that's not a big problem. I'm
unclear as to how to check for a table's existence in SQLite -- that would be better here. */
sqlite_exec(db,
"CREATE TABLE session_data ("
" sess_id PRIMARY KEY,"
" value TEXT, "
" updated INTEGER "
")", NULL, NULL, NULL);
PS_SET_MOD_DATA(db);
return SUCCESS;
}
PS_CLOSE_FUNC(sqlite)
{
PS_SQLITE_DATA;
sqlite_close(db);
return SUCCESS;
}
PS_READ_FUNC(sqlite)
{
PS_SQLITE_DATA;
char *query;
const char *tail;
sqlite_vm *vm;
int colcount, result;
const char **rowdata, **colnames;
char *error;
*val = NULL;
*vallen = 0;
query = sqlite_mprintf("SELECT value FROM session_data WHERE sess_id='%q' LIMIT 1", key);
if (query == NULL) {
/* no memory */
return FAILURE;
}
if (sqlite_compile(db, query, &tail, &vm, &error) != SQLITE_OK) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "SQLite: Could not compile session read query: %s", error);
sqlite_freemem(error);
sqlite_freemem(query);
return FAILURE;
}
switch ((result = sqlite_step(vm, &colcount, &rowdata, &colnames))) {
case SQLITE_ROW:
if (rowdata[0] != NULL) {
*vallen = strlen(rowdata[0]);
if (*vallen) {
*val = emalloc(*vallen);
*vallen = sqlite_decode_binary(rowdata[0], *val);
(*val)[*vallen] = '\0';
} else {
*val = STR_EMPTY_ALLOC();
}
}
break;
default:
sqlite_freemem(error);
error = NULL;
}
if (SQLITE_OK != sqlite_finalize(vm, &error)) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "SQLite: session read: error %s", error);
sqlite_freemem(error);
error = NULL;
}
sqlite_freemem(query);
return *val == NULL ? FAILURE : SUCCESS;
}
PS_WRITE_FUNC(sqlite)
{
PS_SQLITE_DATA;
char *error;
time_t t;
char *binary;
int binlen;
int rv;
t = time(NULL);
binary = safe_emalloc(1 + vallen / 254, 257, 3);
binlen = sqlite_encode_binary((const unsigned char*)val, vallen, binary);
rv = sqlite_exec_printf(db, "REPLACE INTO session_data VALUES('%q', '%q', %d)", NULL, NULL, &error, key, binary, t);
if (rv != SQLITE_OK) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "SQLite: session write query failed: %s", error);
sqlite_freemem(error);
}
efree(binary);
return SQLITE_RETVAL(rv);
}
PS_DESTROY_FUNC(sqlite)
{
int rv;
PS_SQLITE_DATA;
rv = sqlite_exec_printf(db, "DELETE FROM session_data WHERE sess_id='%q'", NULL, NULL, NULL, key);
return SQLITE_RETVAL(rv);
}
PS_GC_FUNC(sqlite)
{
PS_SQLITE_DATA;
int rv;
time_t t = time(NULL);
rv = sqlite_exec_printf(db,
"DELETE FROM session_data WHERE (%d - updated) > %d",
NULL, NULL, NULL, t, maxlifetime);
/* because SQLite does not actually clear the deleted data from the database
* we need to occassionaly do so manually to prevent the sessions database
* from growing endlessly.
*/
if ((int) ((float) PS(gc_divisor) * PS(gc_divisor) * php_combined_lcg(TSRMLS_C)) < PS(gc_probability)) {
rv = sqlite_exec_printf(db, "VACUUM", NULL, NULL, NULL);
}
return SQLITE_RETVAL(rv);
}
#endif /* HAVE_PHP_SESSION && !defined(COMPILE_DL_SESSION) */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
|
