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#include "php_snuffleupagus.h"
static zval *get_param_var(const zend_execute_data *const ed,
const char *const var_name, bool print) {
unsigned int nb_param = ed->func->common.num_args;
for (unsigned int i = 0; i < nb_param; i++) {
const char *arg_name;
if (ZEND_USER_CODE(ed->func->type)) {
arg_name = ZSTR_VAL(ed->func->common.arg_info[i].name);
} else {
arg_name = ed->func->internal_function.arg_info[i].name;
}
if (0 == strcmp(arg_name, var_name)) {
return ZEND_CALL_VAR_NUM(ed, i);
}
if (print == true) {
sp_log_warn("config", " - %d parameter's name: '%s'", i, arg_name);
}
}
return NULL;
}
static zval *get_local_var(zend_execute_data *ed, const char *const var_name) {
zend_execute_data *orig_execute_data = ed;
zend_execute_data *current = ed;
while (current) {
zval *value = NULL;
zend_string *key = NULL;
EG(current_execute_data) = current;
zend_array *symtable = zend_rebuild_symbol_table();
if (UNEXPECTED(symtable == NULL)) {
EG(current_execute_data) = orig_execute_data;
return NULL;
}
ZEND_HASH_FOREACH_STR_KEY_VAL(symtable, key, value) {
if (0 == strcmp(var_name, key->val)) {
if (Z_TYPE_P(value) == IS_INDIRECT) {
value = Z_INDIRECT_P(value);
}
EG(current_execute_data) = orig_execute_data;
return value;
}
}
ZEND_HASH_FOREACH_END();
current = current->prev_execute_data;
}
EG(current_execute_data) = orig_execute_data;
return NULL;
}
static zval *get_constant(const char *const value) {
zend_string *name = zend_string_init(value, strlen(value), 0);
zval *zvalue = zend_get_constant_ex(name, NULL, ZEND_FETCH_CLASS_SILENT);
zend_string_release(name);
return zvalue;
}
static zval *get_var_value(zend_execute_data *ed, const char *var_name,
bool is_param) {
if (!var_name) {
return NULL; // LCOV_EXCL_LINE
}
if (*var_name != VARIABLE_TOKEN) {
return get_constant(var_name);
} else {
var_name++;
}
if (is_param) {
zval *zvalue = get_param_var(ed, var_name, false);
if (!zvalue) {
char *complete_function_path = get_complete_function_path(ed);
sp_log_warn("config",
"It seems that you are filtering on a parameter "
"'%s' of the function '%s', but the parameter does "
"not exists.",
var_name, complete_function_path);
get_param_var(ed, var_name, true);
efree(complete_function_path);
return NULL;
}
return zvalue;
} else {
return get_local_var(ed, var_name);
}
}
static void *get_entry_hashtable(const HashTable *const ht,
const char *const entry, size_t entry_len) {
zval *zvalue = zend_hash_str_find(ht, entry, entry_len);
if (!zvalue) {
zvalue = zend_hash_index_find(ht, atol(entry));
}
while (zvalue &&
(Z_TYPE_P(zvalue) == IS_INDIRECT || Z_TYPE_P(zvalue) == IS_PTR)) {
if (Z_TYPE_P(zvalue) == IS_INDIRECT) {
zvalue = Z_INDIRECT_P(zvalue);
} else {
zvalue = Z_PTR_P(zvalue);
}
}
return zvalue;
}
static zval *get_array_value(zend_execute_data *ed, const zval *const zvalue,
const sp_tree *const tree) {
const zval *const idx_value = sp_get_var_value(ed, tree->idx, false);
if (!zvalue || !idx_value) {
return NULL;
}
if (Z_TYPE_P(zvalue) == IS_ARRAY) {
const zend_string *const idx = sp_zval_to_zend_string(idx_value);
return get_entry_hashtable(Z_ARRVAL_P(zvalue), ZSTR_VAL(idx),
ZSTR_LEN(idx));
}
return NULL;
}
static zval *get_object_property(zend_execute_data *ed, zval *object,
const char *property, bool is_param) {
const char *const class_name = object->value.obj->ce->name->val;
const HashTable *const array = Z_OBJPROP_P(object);
const zval *const property_val = get_var_value(ed, property, is_param);
size_t len;
if (property_val) {
if (Z_TYPE_P(property_val) != IS_STRING) {
return NULL;
} else {
property = Z_STRVAL_P(property_val);
}
}
zval *zvalue = get_entry_hashtable(array, property, strlen(property));
// TODO do we want to log overflow?
if (!zvalue) {
len = strlen(property) + 4;
char *protected_property = emalloc(len);
snprintf(protected_property, len, PROTECTED_PROP_FMT, 0, 0, property);
zvalue = get_entry_hashtable(array, protected_property, len - 1);
efree(protected_property);
}
if (!zvalue) {
len = strlen(class_name) + 3 + strlen(property);
char *private_property = emalloc(len);
snprintf(private_property, len, PRIVATE_PROP_FMT, 0, class_name, 0,
property);
zvalue = get_entry_hashtable(array, private_property, len - 1);
efree(private_property);
}
return zvalue;
}
static zend_class_entry *get_class(const char *const value) {
zend_string *name = zend_string_init(value, strlen(value), 0);
zend_class_entry *ce = zend_lookup_class(name);
zend_string_release(name);
return ce;
}
static zval *get_unknown_type(const char *restrict value, zval *zvalue,
zend_class_entry *ce, zend_execute_data *ed,
const sp_tree *const tree, bool is_param) {
if (ce) {
zvalue = get_entry_hashtable(&ce->constants_table, value, strlen(value));
ce = NULL;
} else if (zvalue && Z_TYPE_P(zvalue) == IS_OBJECT) {
zvalue = get_object_property(ed, zvalue, value, is_param);
} else if (!zvalue) {
if (tree->type == CONSTANT) {
zvalue = get_constant(value);
}
if (!zvalue) {
zvalue = emalloc(sizeof(zval));
ZVAL_PSTRING(zvalue, value);
}
} else {
return NULL;
}
return zvalue;
}
zval *sp_get_var_value(zend_execute_data *ed, const sp_tree *tree,
bool is_param) {
zval *zvalue = NULL;
zend_class_entry *ce = NULL;
while (tree) {
switch (tree->type) {
case ARRAY:
if (ce) {
zvalue = get_entry_hashtable(&ce->constants_table, tree->value,
strlen(tree->value));
ce = NULL;
} else if (!zvalue) {
zvalue = get_var_value(ed, tree->value, is_param);
} else if (Z_TYPE_P(zvalue) == IS_OBJECT) {
zvalue = get_object_property(ed, zvalue, tree->value, is_param);
}
zvalue = get_array_value(ed, zvalue, tree);
break;
case VAR:
if (zvalue && Z_TYPE_P(zvalue) == IS_OBJECT) {
zvalue = get_object_property(ed, zvalue, tree->value, is_param);
} else {
zvalue = get_var_value(ed, tree->value, is_param);
}
break;
case OBJECT:
if (!zvalue) {
zvalue = get_var_value(ed, tree->value, is_param);
} else if (Z_TYPE_P(zvalue) == IS_OBJECT) {
if (0 != strlen(tree->value)) {
zvalue = get_object_property(ed, zvalue, tree->value, is_param);
}
} else {
return NULL;
}
break;
case CLASS:
ce = get_class(tree->value);
zvalue = NULL;
break;
default:
zvalue = get_unknown_type(tree->value, zvalue, ce, ed, tree, is_param);
ce = NULL;
break;
}
if (!zvalue && !ce) {
return NULL;
}
tree = tree->next;
}
return zvalue;
}
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