mirror of
https://github.com/php/php-src.git
synced 2024-11-28 04:14:26 +08:00
408 lines
7.9 KiB
C++
408 lines
7.9 KiB
C++
#include "php.h"
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#include "ext/standard/php_var.h"
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#include "php_incomplete_class.h"
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/* {{{ reference-handling for unserializer: var_* */
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#define VAR_ENTRIES_MAX 1024
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typedef struct {
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zval *data[VAR_ENTRIES_MAX];
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int used_slots;
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void *next;
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} var_entries;
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static inline void var_push(php_unserialize_data_t *var_hashx, zval **rval)
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{
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var_entries *var_hash = var_hashx->first, *prev = NULL;
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while (var_hash && var_hash->used_slots == VAR_ENTRIES_MAX) {
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prev = var_hash;
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var_hash = var_hash->next;
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}
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if (!var_hash) {
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var_hash = emalloc(sizeof(var_entries));
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var_hash->used_slots = 0;
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var_hash->next = 0;
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if (!var_hashx->first)
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var_hashx->first = var_hash;
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else
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prev->next = var_hash;
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}
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var_hash->data[var_hash->used_slots++] = *rval;
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}
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void var_replace(php_unserialize_data_t *var_hashx, zval *ozval, zval **nzval)
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{
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int i;
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var_entries *var_hash = var_hashx->first;
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while (var_hash) {
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for (i = 0; i < var_hash->used_slots; i++) {
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if (var_hash->data[i] == ozval) {
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var_hash->data[i] = *nzval;
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return;
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}
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}
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var_hash = var_hash->next;
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}
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}
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static int var_access(php_unserialize_data_t *var_hashx, int id, zval ***store)
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{
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var_entries *var_hash = var_hashx->first;
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while (id >= VAR_ENTRIES_MAX && var_hash && var_hash->used_slots == VAR_ENTRIES_MAX) {
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var_hash = var_hash->next;
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id -= VAR_ENTRIES_MAX;
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}
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if (!var_hash) return !SUCCESS;
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if (id >= var_hash->used_slots) return !SUCCESS;
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*store = &var_hash->data[id];
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return SUCCESS;
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}
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void var_destroy(php_unserialize_data_t *var_hashx)
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{
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void *next;
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var_entries *var_hash = var_hashx->first;
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while (var_hash) {
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next = var_hash->next;
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efree(var_hash);
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var_hash = next;
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}
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}
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/* }}} */
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#define YYFILL(n) do { } while (0)
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#define YYCTYPE unsigned char
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#define YYCURSOR cursor
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#define YYLIMIT limit
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#define YYMARKER marker
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/*!re2c
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iv = [+-]? [0-9]+;
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nv = [+-]? ([0-9]* "." [0-9]+|[0-9]+ "." [0-9]+);
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nvexp = nv [eE] [+-]? iv;
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any = [\000-\277];
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*/
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static inline int parse_iv2(const char *p, const char **q)
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{
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char cursor;
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int result = 0;
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int neg = 0;
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switch (*p) {
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case '-':
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neg++;
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/* fall-through */
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case '+':
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p++;
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}
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while (1) {
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cursor = *p;
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if (cursor >= '0' && cursor <= '9') {
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result = result * 10 + cursor - '0';
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} else {
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break;
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}
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p++;
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}
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if (q) *q = p;
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if (neg) return -result;
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return result;
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}
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static inline int parse_iv(const char *p)
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{
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return parse_iv2(p, NULL);
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}
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#define UNSERIALIZE_PARAMETER zval **rval, const char **p, const char *max, php_unserialize_data_t *var_hash TSRMLS_DC
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#define UNSERIALIZE_PASSTHRU rval, p, max, var_hash TSRMLS_CC
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static inline int process_nested_data(UNSERIALIZE_PARAMETER, HashTable *ht, int elements)
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{
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while (elements-- > 0) {
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zval *key, *data;
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ALLOC_INIT_ZVAL(key);
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if (!php_var_unserialize(&key, p, max, NULL TSRMLS_CC)) {
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zval_dtor(key);
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FREE_ZVAL(key);
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return 0;
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}
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ALLOC_INIT_ZVAL(data);
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if (!php_var_unserialize(&data, p, max, var_hash TSRMLS_CC)) {
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zval_dtor(key);
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FREE_ZVAL(key);
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zval_dtor(data);
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FREE_ZVAL(data);
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return 0;
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}
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switch (Z_TYPE_P(key)) {
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case IS_LONG:
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zend_hash_index_update(ht, Z_LVAL_P(key), &data, sizeof(data), NULL);
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break;
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case IS_STRING:
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zend_hash_update(ht, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, &data, sizeof(data), NULL);
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break;
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}
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zval_dtor(key);
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FREE_ZVAL(key);
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}
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return 1;
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}
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static inline int finish_nested_data(UNSERIALIZE_PARAMETER)
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{
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if (*((*p)++) == '}')
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return 1;
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#if SOMETHING_NEW_MIGHT_LEAD_TO_CRASH_ENABLE_IF_YOU_ARE_BRAVE
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zval_ptr_dtor(rval);
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#endif
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return 0;
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}
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static inline int object_common1(UNSERIALIZE_PARAMETER, zend_class_entry *ce)
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{
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int elements;
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elements = parse_iv2((*p) + 2, p);
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(*p) += 2;
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object_init_ex(*rval, ce);
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return elements;
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}
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static inline int object_common2(UNSERIALIZE_PARAMETER, int elements)
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{
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zval *retval_ptr = NULL;
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zval fname;
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if (!process_nested_data(UNSERIALIZE_PASSTHRU, Z_OBJPROP_PP(rval), elements)) {
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return 0;
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}
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INIT_PZVAL(&fname);
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ZVAL_STRINGL(&fname, "__wakeup", sizeof("__wakeup") - 1, 0);
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call_user_function_ex(CG(function_table), rval, &fname, &retval_ptr, 0, 0, 1, NULL TSRMLS_CC);
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if (retval_ptr)
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zval_ptr_dtor(&retval_ptr);
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return finish_nested_data(UNSERIALIZE_PASSTHRU);
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}
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PHPAPI int php_var_unserialize(UNSERIALIZE_PARAMETER)
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{
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const unsigned char *cursor, *limit, *marker, *start;
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zval **rval_ref;
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limit = cursor = *p;
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if (var_hash && cursor[0] != 'R') {
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var_push(var_hash, rval);
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}
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start = cursor;
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/*!re2c
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"R:" iv ";" {
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int id;
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*p = YYCURSOR;
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if (!var_hash) return 0;
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id = parse_iv(start + 2) - 1;
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if (id == -1 || var_access(var_hash, id, &rval_ref) != SUCCESS) {
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return 0;
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}
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zval_ptr_dtor(rval);
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*rval = *rval_ref;
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(*rval)->refcount++;
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(*rval)->is_ref = 1;
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return 1;
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}
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"N;" {
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*p = YYCURSOR;
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INIT_PZVAL(*rval);
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ZVAL_NULL(*rval);
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return 1;
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}
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"b:" iv ";" {
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*p = YYCURSOR;
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INIT_PZVAL(*rval);
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ZVAL_BOOL(*rval, parse_iv(start + 2));
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return 1;
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}
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"i:" iv ";" {
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*p = YYCURSOR;
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INIT_PZVAL(*rval);
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ZVAL_LONG(*rval, parse_iv(start + 2));
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return 1;
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}
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"d:" (iv | nv | nvexp) ";" {
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*p = YYCURSOR;
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INIT_PZVAL(*rval);
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ZVAL_DOUBLE(*rval, atof(start + 2));
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return 1;
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}
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"s:" iv ":" ["] {
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int len;
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char *str;
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len = parse_iv(start + 2);
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if (len == 0) {
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str = empty_string;
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} else {
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str = estrndup(YYCURSOR, len);
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}
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YYCURSOR += len + 2;
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*p = YYCURSOR;
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INIT_PZVAL(*rval);
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ZVAL_STRINGL(*rval, str, len, 0);
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return 1;
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}
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"a:" iv ":" "{" {
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int elements = parse_iv(start + 2);
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*p = YYCURSOR;
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INIT_PZVAL(*rval);
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Z_TYPE_PP(rval) = IS_ARRAY;
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ALLOC_HASHTABLE(Z_ARRVAL_PP(rval));
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zend_hash_init(Z_ARRVAL_PP(rval), elements + 1, NULL, ZVAL_PTR_DTOR, 0);
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if (!process_nested_data(UNSERIALIZE_PASSTHRU, Z_ARRVAL_PP(rval), elements)) {
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return 0;
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}
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return finish_nested_data(UNSERIALIZE_PASSTHRU);
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}
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"o:" iv ":" ["] {
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INIT_PZVAL(*rval);
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return object_common2(UNSERIALIZE_PASSTHRU,
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object_common1(UNSERIALIZE_PASSTHRU, ZEND_STANDARD_CLASS_DEF_PTR));
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}
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"O:" iv ":" ["] {
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int len;
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int elements;
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int len2;
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char *class_name;
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zend_class_entry *ce;
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int incomplete_class = 0;
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zval *user_func;
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zval *retval_ptr;
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zval **args[1];
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zval *arg_func_name;
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INIT_PZVAL(*rval);
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len2 = len = parse_iv(start + 2);
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if (len == 0)
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return 0;
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class_name = estrndup(YYCURSOR, len);
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YYCURSOR += len;
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while (len-- > 0) {
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if (class_name[len] >= 'A' && class_name[len] <= 'Z') {
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class_name[len] = class_name[len] - 'A' + 'a';
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}
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}
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if (zend_hash_find(CG(class_table), class_name, len2 + 1, (void **) &ce) != SUCCESS) {
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if ((PG(unserialize_callback_func) == NULL) || (PG(unserialize_callback_func)[0] == '\0')) {
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incomplete_class = 1;
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ce = PHP_IC_ENTRY;
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} else {
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MAKE_STD_ZVAL(user_func);
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ZVAL_STRING(user_func, PG(unserialize_callback_func), 1);
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args[0] = &arg_func_name;
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MAKE_STD_ZVAL(arg_func_name);
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ZVAL_STRING(arg_func_name, class_name, 1);
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if (call_user_function_ex(CG(function_table), NULL, user_func, &retval_ptr, 1, args, 0, NULL TSRMLS_CC) != SUCCESS) {
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zend_error(E_WARNING, "'unserialize_callback_func' defined (%s) but not found", user_func->value.str.val);
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incomplete_class = 1;
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ce = PHP_IC_ENTRY;
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} else {
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if (zend_hash_find(CG(class_table), class_name, len2 + 1, (void **) &ce) != SUCCESS) {
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zend_error(E_WARNING, "'unserialize_callback_func' (%s) hasn't defined the class it was called for", user_func->value.str.val);
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incomplete_class = 1;
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ce = PHP_IC_ENTRY;
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} else
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efree(class_name);
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}
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}
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} else
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efree(class_name);
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*p = YYCURSOR;
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elements = object_common1(UNSERIALIZE_PASSTHRU, ce);
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if (incomplete_class) {
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php_store_class_name(*rval, class_name, len2);
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efree(class_name);
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}
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return object_common2(UNSERIALIZE_PASSTHRU, elements);
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}
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"}" {
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/* this is the case where we have less data than planned */
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zend_error(E_NOTICE, "Unexpected end of serialized data");
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return 0; /* not sure if it should be 0 or 1 here? */
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}
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any { return 0; }
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*/
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return 0;
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}
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