Mirror of the official OpenWrt ubus repository https://git.openwrt.org/project/ubus
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/*
* Copyright (C) 2011 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "ubusd.h"
#include "ubusd_obj.h"
struct avl_tree obj_types;
struct avl_tree objects;
struct avl_tree path;
static void ubus_unref_object_type(struct ubus_object_type *type)
{
struct ubus_method *m, *tmp;
if (--type->refcount > 0)
return;
list_for_each_entry_safe(m, tmp, &type->methods, list) {
list_del(&m->list);
free(m);
}
ubus_free_id(&obj_types, &type->id);
free(type);
}
static bool ubus_create_obj_method(struct ubus_object_type *type, struct blob_attr *attr)
{
struct ubus_method *m;
int bloblen = blob_raw_len(attr);
m = calloc(1, sizeof(*m) + bloblen);
if (!m)
return false;
list_add_tail(&m->list, &type->methods);
memcpy(m->data, attr, bloblen);
m->name = blobmsg_name(m->data);
return true;
}
static struct ubus_object_type *ubus_create_obj_type(struct blob_attr *sig)
{
struct ubus_object_type *type;
struct blob_attr *pos;
size_t rem;
type = calloc(1, sizeof(*type));
if (!type)
return NULL;
type->refcount = 1;
if (!ubus_alloc_id(&obj_types, &type->id, 0))
goto error_free;
INIT_LIST_HEAD(&type->methods);
blob_for_each_attr(pos, sig, rem) {
if (!blobmsg_check_attr(pos, true))
goto error_unref;
if (!ubus_create_obj_method(type, pos))
goto error_unref;
}
return type;
error_unref:
ubus_unref_object_type(type);
return NULL;
error_free:
free(type);
return NULL;
}
static struct ubus_object_type *ubus_get_obj_type(uint32_t obj_id)
{
struct ubus_object_type *type;
struct ubus_id *id;
id = ubus_find_id(&obj_types, obj_id);
if (!id)
return NULL;
type = container_of(id, struct ubus_object_type, id);
type->refcount++;
return type;
}
struct ubus_object *ubusd_create_object_internal(struct ubus_object_type *type, uint32_t id)
{
struct ubus_object *obj;
obj = calloc(1, sizeof(*obj));
if (!obj)
return NULL;
if (!ubus_alloc_id(&objects, &obj->id, id))
goto error_free;
obj->type = type;
INIT_LIST_HEAD(&obj->list);
INIT_LIST_HEAD(&obj->events);
INIT_LIST_HEAD(&obj->subscribers);
INIT_LIST_HEAD(&obj->target_list);
if (type)
type->refcount++;
return obj;
error_free:
free(obj);
return NULL;
}
struct ubus_object *ubusd_create_object(struct ubus_client *cl, struct blob_attr **attr)
{
struct ubus_object *obj;
struct ubus_object_type *type = NULL;
if (attr[UBUS_ATTR_OBJTYPE])
type = ubus_get_obj_type(blob_get_u32(attr[UBUS_ATTR_OBJTYPE]));
else if (attr[UBUS_ATTR_SIGNATURE])
type = ubus_create_obj_type(attr[UBUS_ATTR_SIGNATURE]);
obj = ubusd_create_object_internal(type, 0);
if (type)
ubus_unref_object_type(type);
if (!obj)
return NULL;
if (attr[UBUS_ATTR_OBJPATH]) {
if (ubusd_acl_check(cl, blob_data(attr[UBUS_ATTR_OBJPATH]), NULL, UBUS_ACL_PUBLISH))
goto free;
obj->path.key = strdup(blob_data(attr[UBUS_ATTR_OBJPATH]));
if (!obj->path.key)
goto free;
if (avl_insert(&path, &obj->path) != 0) {
free((void *) obj->path.key);
obj->path.key = NULL;
goto free;
}
ubusd_send_obj_event(obj, true);
}
obj->client = cl;
list_add(&obj->list, &cl->objects);
return obj;
free:
ubusd_free_object(obj);
return NULL;
}
void ubus_subscribe(struct ubus_object *obj, struct ubus_object *target)
{
struct ubus_subscription *s;
bool first = list_empty(&target->subscribers);
s = calloc(1, sizeof(*s));
if (!s)
return;
s->subscriber = obj;
s->target = target;
list_add(&s->list, &target->subscribers);
list_add(&s->target_list, &obj->target_list);
if (first)
ubus_notify_subscription(target);
}
void ubus_unsubscribe(struct ubus_subscription *s)
{
struct ubus_object *obj = s->target;
list_del(&s->list);
list_del(&s->target_list);
free(s);
if (list_empty(&obj->subscribers))
ubus_notify_subscription(obj);
}
void ubusd_free_object(struct ubus_object *obj)
{
struct ubus_subscription *s, *tmp;
list_for_each_entry_safe(s, tmp, &obj->target_list, target_list) {
ubus_unsubscribe(s);
}
list_for_each_entry_safe(s, tmp, &obj->subscribers, list) {
ubus_notify_unsubscribe(s);
}
ubusd_event_cleanup_object(obj);
if (obj->path.key) {
ubusd_send_obj_event(obj, false);
avl_delete(&path, &obj->path);
free((void *) obj->path.key);
}
if (!list_empty(&obj->list))
list_del(&obj->list);
ubus_free_id(&objects, &obj->id);
if (obj->type)
ubus_unref_object_type(obj->type);
free(obj);
}
static void __constructor ubusd_obj_init(void)
{
ubus_init_id_tree(&objects);
ubus_init_id_tree(&obj_types);
ubus_init_string_tree(&path, false);
ubusd_event_init();
ubusd_acl_init();
ubusd_monitor_init();
}