php-src/ext/standard/var_unserializer.re

484 lines
10 KiB
C++

/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2004 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.0 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_0.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. |
+----------------------------------------------------------------------+
| Author: Sascha Schumann <sascha@schumann.cx> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "php.h"
#include "ext/standard/php_var.h"
#include "php_incomplete_class.h"
/* {{{ reference-handling for unserializer: var_* */
#define VAR_ENTRIES_MAX 1024
typedef struct {
zval *data[VAR_ENTRIES_MAX];
int used_slots;
void *next;
} var_entries;
static inline void var_push(php_unserialize_data_t *var_hashx, zval **rval)
{
var_entries *var_hash = var_hashx->first, *prev = NULL;
while (var_hash && var_hash->used_slots == VAR_ENTRIES_MAX) {
prev = var_hash;
var_hash = var_hash->next;
}
if (!var_hash) {
var_hash = emalloc(sizeof(var_entries));
var_hash->used_slots = 0;
var_hash->next = 0;
if (!var_hashx->first)
var_hashx->first = var_hash;
else
prev->next = var_hash;
}
var_hash->data[var_hash->used_slots++] = *rval;
}
PHPAPI void var_replace(php_unserialize_data_t *var_hashx, zval *ozval, zval **nzval)
{
int i;
var_entries *var_hash = var_hashx->first;
while (var_hash) {
for (i = 0; i < var_hash->used_slots; i++) {
if (var_hash->data[i] == ozval) {
var_hash->data[i] = *nzval;
return;
}
}
var_hash = var_hash->next;
}
}
static int var_access(php_unserialize_data_t *var_hashx, int id, zval ***store)
{
var_entries *var_hash = var_hashx->first;
while (id >= VAR_ENTRIES_MAX && var_hash && var_hash->used_slots == VAR_ENTRIES_MAX) {
var_hash = var_hash->next;
id -= VAR_ENTRIES_MAX;
}
if (!var_hash) return !SUCCESS;
if (id >= var_hash->used_slots) return !SUCCESS;
*store = &var_hash->data[id];
return SUCCESS;
}
PHPAPI void var_destroy(php_unserialize_data_t *var_hashx)
{
void *next;
var_entries *var_hash = var_hashx->first;
while (var_hash) {
next = var_hash->next;
efree(var_hash);
var_hash = next;
}
}
/* }}} */
#define YYFILL(n) do { } while (0)
#define YYCTYPE unsigned char
#define YYCURSOR cursor
#define YYLIMIT limit
#define YYMARKER marker
/*!re2c
uiv = [+]? [0-9]+;
iv = [+-]? [0-9]+;
nv = [+-]? ([0-9]* "." [0-9]+|[0-9]+ "." [0-9]*);
nvexp = (iv | nv) [eE] [+-]? iv;
any = [\000-\277];
*/
static inline int parse_iv2(const char *p, const char **q)
{
char cursor;
int result = 0;
int neg = 0;
switch (*p) {
case '-':
neg++;
/* fall-through */
case '+':
p++;
}
while (1) {
cursor = *p;
if (cursor >= '0' && cursor <= '9') {
result = result * 10 + cursor - '0';
} else {
break;
}
p++;
}
if (q) *q = p;
if (neg) return -result;
return result;
}
static inline int parse_iv(const char *p)
{
return parse_iv2(p, NULL);
}
#define UNSERIALIZE_PARAMETER zval **rval, const char **p, const char *max, php_unserialize_data_t *var_hash TSRMLS_DC
#define UNSERIALIZE_PASSTHRU rval, p, max, var_hash TSRMLS_CC
static inline int process_nested_data(UNSERIALIZE_PARAMETER, HashTable *ht, int elements)
{
while (elements-- > 0) {
zval *key, *data;
ALLOC_INIT_ZVAL(key);
if (!php_var_unserialize(&key, p, max, NULL TSRMLS_CC)) {
zval_dtor(key);
FREE_ZVAL(key);
return 0;
}
ALLOC_INIT_ZVAL(data);
if (!php_var_unserialize(&data, p, max, var_hash TSRMLS_CC)) {
zval_dtor(key);
FREE_ZVAL(key);
zval_dtor(data);
FREE_ZVAL(data);
return 0;
}
switch (Z_TYPE_P(key)) {
case IS_LONG:
zend_hash_index_update(ht, Z_LVAL_P(key), &data, sizeof(data), NULL);
break;
case IS_STRING:
zend_hash_update(ht, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, &data, sizeof(data), NULL);
break;
}
zval_dtor(key);
FREE_ZVAL(key);
}
return 1;
}
static inline int finish_nested_data(UNSERIALIZE_PARAMETER)
{
if (*((*p)++) == '}')
return 1;
#if SOMETHING_NEW_MIGHT_LEAD_TO_CRASH_ENABLE_IF_YOU_ARE_BRAVE
zval_ptr_dtor(rval);
#endif
return 0;
}
static inline int object_common1(UNSERIALIZE_PARAMETER, zend_class_entry *ce)
{
int elements;
elements = parse_iv2((*p) + 2, p);
(*p) += 2;
object_init_ex(*rval, ce);
return elements;
}
static inline int object_common2(UNSERIALIZE_PARAMETER, int elements)
{
zval *retval_ptr = NULL;
zval fname;
if (!process_nested_data(UNSERIALIZE_PASSTHRU, Z_OBJPROP_PP(rval), elements)) {
return 0;
}
if(Z_OBJCE_PP(rval) != PHP_IC_ENTRY) {
INIT_PZVAL(&fname);
ZVAL_STRINGL(&fname, "__wakeup", sizeof("__wakeup") - 1, 0);
call_user_function_ex(CG(function_table), rval, &fname, &retval_ptr, 0, 0, 1, NULL TSRMLS_CC);
}
if (retval_ptr)
zval_ptr_dtor(&retval_ptr);
return finish_nested_data(UNSERIALIZE_PASSTHRU);
}
PHPAPI int php_var_unserialize(UNSERIALIZE_PARAMETER)
{
const unsigned char *cursor, *limit, *marker, *start;
zval **rval_ref;
limit = cursor = *p;
if (var_hash && cursor[0] != 'R') {
var_push(var_hash, rval);
}
start = cursor;
/*!re2c
"R:" iv ";" {
int id;
*p = YYCURSOR;
if (!var_hash) return 0;
id = parse_iv(start + 2) - 1;
if (id == -1 || var_access(var_hash, id, &rval_ref) != SUCCESS) {
return 0;
}
if (*rval != NULL) {
zval_ptr_dtor(rval);
}
*rval = *rval_ref;
(*rval)->refcount++;
(*rval)->is_ref = 1;
return 1;
}
"r:" iv ";" {
int id;
*p = YYCURSOR;
if (!var_hash) return 0;
id = parse_iv(start + 2) - 1;
if (id == -1 || var_access(var_hash, id, &rval_ref) != SUCCESS) {
return 0;
}
if (*rval != NULL) {
zval_ptr_dtor(rval);
}
*rval = *rval_ref;
(*rval)->refcount++;
(*rval)->is_ref = 0;
return 1;
}
"N;" {
*p = YYCURSOR;
INIT_PZVAL(*rval);
ZVAL_NULL(*rval);
return 1;
}
"b:" iv ";" {
*p = YYCURSOR;
INIT_PZVAL(*rval);
ZVAL_BOOL(*rval, parse_iv(start + 2));
return 1;
}
"i:" iv ";" {
*p = YYCURSOR;
INIT_PZVAL(*rval);
ZVAL_LONG(*rval, parse_iv(start + 2));
return 1;
}
"d:" ("NAN" | "-"? "INF") ";" {
*p = YYCURSOR;
INIT_PZVAL(*rval);
#if defined(HAVE_ATOF_ACCEPTS_NAN) && defined(HAVE_ATOF_ACCEPTS_INF)
ZVAL_DOUBLE(*rval, atof(start + 2));
#else
if (!strncmp(start + 2, "NAN", 3)) {
ZVAL_DOUBLE(*rval, php_get_nan());
} else if (!strncmp(start + 2, "INF", 3)) {
ZVAL_DOUBLE(*rval, php_get_inf());
} else if (!strncmp(start + 2, "-INF", 4)) {
ZVAL_DOUBLE(*rval, -php_get_inf());
}
#endif
return 1;
}
"d:" (iv | nv | nvexp) ";" {
*p = YYCURSOR;
INIT_PZVAL(*rval);
ZVAL_DOUBLE(*rval, atof(start + 2));
return 1;
}
"s:" uiv ":" ["] {
int len;
char *str;
len = parse_iv(start + 2);
if (len == 0) {
str = empty_string;
} else {
str = estrndup(YYCURSOR, len);
}
YYCURSOR += len + 2;
*p = YYCURSOR;
INIT_PZVAL(*rval);
ZVAL_STRINGL(*rval, str, len, 0);
return 1;
}
"a:" uiv ":" "{" {
int elements = parse_iv(start + 2);
*p = YYCURSOR;
INIT_PZVAL(*rval);
Z_TYPE_PP(rval) = IS_ARRAY;
ALLOC_HASHTABLE(Z_ARRVAL_PP(rval));
zend_hash_init(Z_ARRVAL_PP(rval), elements + 1, NULL, ZVAL_PTR_DTOR, 0);
if (!process_nested_data(UNSERIALIZE_PASSTHRU, Z_ARRVAL_PP(rval), elements)) {
return 0;
}
return finish_nested_data(UNSERIALIZE_PASSTHRU);
}
"o:" iv ":" ["] {
INIT_PZVAL(*rval);
return object_common2(UNSERIALIZE_PASSTHRU,
object_common1(UNSERIALIZE_PASSTHRU, ZEND_STANDARD_CLASS_DEF_PTR));
}
"O:" uiv ":" ["] {
int len;
int elements;
int len2;
char *class_name;
zend_class_entry *ce;
zend_class_entry **pce;
int incomplete_class = 0;
zval *user_func;
zval *retval_ptr;
zval **args[1];
zval *arg_func_name;
INIT_PZVAL(*rval);
len2 = len = parse_iv(start + 2);
if (len == 0)
return 0;
class_name = estrndup(YYCURSOR, len);
YYCURSOR += len;
do {
/* Try to find class directly */
if (zend_lookup_class(class_name, len2, &pce TSRMLS_CC) == SUCCESS) {
ce = *pce;
break;
}
/* Check for unserialize callback */
if ((PG(unserialize_callback_func) == NULL) || (PG(unserialize_callback_func)[0] == '\0')) {
incomplete_class = 1;
ce = PHP_IC_ENTRY;
break;
}
/* Call unserialize callback */
MAKE_STD_ZVAL(user_func);
ZVAL_STRING(user_func, PG(unserialize_callback_func), 1);
args[0] = &arg_func_name;
MAKE_STD_ZVAL(arg_func_name);
ZVAL_STRING(arg_func_name, class_name, 1);
if (call_user_function_ex(CG(function_table), NULL, user_func, &retval_ptr, 1, args, 0, NULL TSRMLS_CC) != SUCCESS) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "defined (%s) but not found", user_func->value.str.val);
incomplete_class = 1;
ce = PHP_IC_ENTRY;
zval_ptr_dtor(&user_func);
zval_ptr_dtor(&arg_func_name);
break;
}
if (retval_ptr) {
zval_ptr_dtor(&retval_ptr);
}
/* The callback function may have defined the class */
if (zend_lookup_class(class_name, len2, &pce TSRMLS_CC) == SUCCESS) {
ce = *pce;
} else {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Function %s() hasn't defined the class it was called for", user_func->value.str.val);
incomplete_class = 1;
ce = PHP_IC_ENTRY;
}
zval_ptr_dtor(&user_func);
zval_ptr_dtor(&arg_func_name);
break;
} while (1);
*p = YYCURSOR;
elements = object_common1(UNSERIALIZE_PASSTHRU, ce);
if (incomplete_class) {
php_store_class_name(*rval, class_name, len2);
}
efree(class_name);
return object_common2(UNSERIALIZE_PASSTHRU, elements);
}
"}" {
/* this is the case where we have less data than planned */
php_error_docref(NULL TSRMLS_CC, E_NOTICE, "Unexpected end of serialized data");
return 0; /* not sure if it should be 0 or 1 here? */
}
any { return 0; }
*/
return 0;
}