2 * Copyright (C) 2011 Felix Fietkau <nbd@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License version 2.1
6 * as published by the Free Software Foundation
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <arpa/inet.h>
18 static struct ubus_msg_buf *retmsg;
19 static int *retmsg_data;
20 static struct avl_tree clients;
22 static struct blob_attr *attrbuf[UBUS_ATTR_MAX];
24 typedef int (*ubus_cmd_cb)(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr);
26 static const struct blob_attr_info ubus_policy[UBUS_ATTR_MAX] = {
27 [UBUS_ATTR_SIGNATURE] = { .type = BLOB_ATTR_NESTED },
28 [UBUS_ATTR_OBJTYPE] = { .type = BLOB_ATTR_INT32 },
29 [UBUS_ATTR_OBJPATH] = { .type = BLOB_ATTR_STRING },
30 [UBUS_ATTR_OBJID] = { .type = BLOB_ATTR_INT32 },
31 [UBUS_ATTR_STATUS] = { .type = BLOB_ATTR_INT32 },
32 [UBUS_ATTR_METHOD] = { .type = BLOB_ATTR_STRING },
35 static struct blob_attr **ubus_parse_msg(struct blob_attr *msg)
37 blob_parse(msg, attrbuf, ubus_policy, UBUS_ATTR_MAX);
41 static void ubus_msg_init(struct ubus_msg_buf *ub, uint8_t type, uint16_t seq, uint32_t peer)
49 static struct ubus_msg_buf *ubus_msg_from_blob(bool shared)
51 return ubus_msg_new(b.head, blob_raw_len(b.head), shared);
54 static struct ubus_msg_buf *ubus_reply_from_blob(struct ubus_msg_buf *ub, bool shared)
56 struct ubus_msg_buf *new;
58 new = ubus_msg_from_blob(shared);
62 ubus_msg_init(new, UBUS_MSG_DATA, ub->hdr.seq, ub->hdr.peer);
67 ubus_send_msg_from_blob(struct ubus_client *cl, struct ubus_msg_buf *ub,
70 ub = ubus_reply_from_blob(ub, true);
75 ubus_msg_send(cl, ub, true);
78 static bool ubusd_send_hello(struct ubus_client *cl)
80 struct ubus_msg_buf *ub;
83 ub = ubus_msg_from_blob(true);
87 ubus_msg_init(ub, UBUS_MSG_HELLO, 0, cl->id.id);
88 ubus_msg_send(cl, ub, true);
92 static int ubusd_send_pong(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
94 ub->hdr.type = UBUS_MSG_DATA;
95 ubus_msg_send(cl, ub, false);
99 static int ubusd_handle_remove_object(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
101 struct ubus_object *obj;
103 if (!attr[UBUS_ATTR_OBJID])
104 return UBUS_STATUS_INVALID_ARGUMENT;
106 obj = ubusd_find_object(blob_get_u32(attr[UBUS_ATTR_OBJID]));
108 return UBUS_STATUS_NOT_FOUND;
110 if (obj->client != cl)
111 return UBUS_STATUS_PERMISSION_DENIED;
113 blob_buf_init(&b, 0);
114 blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
116 /* check if we're removing the object type as well */
117 if (obj->type && obj->type->refcount == 1)
118 blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id.id);
120 ubusd_free_object(obj);
121 ubus_send_msg_from_blob(cl, ub, UBUS_MSG_DATA);
126 static int ubusd_handle_add_object(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
128 struct ubus_object *obj;
130 obj = ubusd_create_object(cl, attr);
132 return UBUS_STATUS_INVALID_ARGUMENT;
134 blob_buf_init(&b, 0);
135 blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
136 if (attr[UBUS_ATTR_SIGNATURE])
137 blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id.id);
139 ubus_send_msg_from_blob(cl, ub, UBUS_MSG_DATA);
143 static void ubusd_send_obj(struct ubus_client *cl, struct ubus_msg_buf *ub, struct ubus_object *obj)
145 struct ubus_method *m;
148 blob_buf_init(&b, 0);
151 blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->path.key);
152 blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
153 blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id.id);
155 s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
156 list_for_each_entry(m, &obj->type->methods, list)
157 blob_put(&b, blob_id(m->data), blob_data(m->data), blob_len(m->data));
158 blob_nest_end(&b, s);
160 ubus_send_msg_from_blob(cl, ub, UBUS_MSG_DATA);
163 static int ubusd_handle_lookup(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
165 struct ubus_object *obj;
170 if (!attr[UBUS_ATTR_OBJPATH]) {
171 avl_for_each_element(&path, obj, path)
172 ubusd_send_obj(cl, ub, obj);
176 objpath = blob_data(attr[UBUS_ATTR_OBJPATH]);
177 len = strlen(objpath);
178 if (objpath[len - 1] != '*') {
179 obj = avl_find_element(&path, objpath, obj, path);
181 return UBUS_STATUS_NOT_FOUND;
183 ubusd_send_obj(cl, ub, obj);
189 obj = avl_find_ge_element(&path, objpath, obj, path);
191 return UBUS_STATUS_NOT_FOUND;
193 while (!strncmp(objpath, obj->path.key, len)) {
195 ubusd_send_obj(cl, ub, obj);
196 if (obj == avl_last_element(&path, obj, path))
198 obj = avl_next_element(obj, path);
202 return UBUS_STATUS_NOT_FOUND;
208 ubusd_forward_invoke(struct ubus_object *obj, const char *method,
209 struct ubus_msg_buf *ub, struct blob_attr *data)
211 blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
212 blob_put_string(&b, UBUS_ATTR_METHOD, method);
214 blob_put(&b, UBUS_ATTR_DATA, blob_data(data), blob_len(data));
216 ubus_send_msg_from_blob(obj->client, ub, UBUS_MSG_INVOKE);
219 static int ubusd_handle_invoke(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
221 struct ubus_object *obj = NULL;
225 if (!attr[UBUS_ATTR_METHOD] || !attr[UBUS_ATTR_OBJID])
226 return UBUS_STATUS_INVALID_ARGUMENT;
228 id = ubus_find_id(&objects, blob_get_u32(attr[UBUS_ATTR_OBJID]));
230 return UBUS_STATUS_NOT_FOUND;
232 obj = container_of(id, struct ubus_object, id);
234 method = blob_data(attr[UBUS_ATTR_METHOD]);
237 return obj->recv_msg(cl, method, attr[UBUS_ATTR_DATA]);
239 ub->hdr.peer = cl->id.id;
240 blob_buf_init(&b, 0);
241 ubusd_forward_invoke(obj, method, ub, attr[UBUS_ATTR_DATA]);
247 static int ubusd_handle_notify(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
249 struct ubus_object *obj = NULL;
250 struct ubus_subscription *s;
253 bool no_reply = false;
256 if (!attr[UBUS_ATTR_METHOD] || !attr[UBUS_ATTR_OBJID])
257 return UBUS_STATUS_INVALID_ARGUMENT;
259 if (attr[UBUS_ATTR_NO_REPLY])
260 no_reply = blob_get_int8(attr[UBUS_ATTR_NO_REPLY]);
262 id = ubus_find_id(&objects, blob_get_u32(attr[UBUS_ATTR_OBJID]));
264 return UBUS_STATUS_NOT_FOUND;
266 obj = container_of(id, struct ubus_object, id);
267 if (obj->client != cl)
268 return UBUS_STATUS_PERMISSION_DENIED;
271 blob_buf_init(&b, 0);
272 blob_put_int32(&b, UBUS_ATTR_OBJID, id->id);
273 c = blob_nest_start(&b, UBUS_ATTR_SUBSCRIBERS);
274 list_for_each_entry(s, &obj->subscribers, list) {
275 blob_put_int32(&b, 0, s->subscriber->id.id);
277 blob_nest_end(&b, c);
278 blob_put_int32(&b, UBUS_ATTR_STATUS, 0);
279 ubus_send_msg_from_blob(cl, ub, UBUS_MSG_STATUS);
282 ub->hdr.peer = cl->id.id;
283 method = blob_data(attr[UBUS_ATTR_METHOD]);
284 list_for_each_entry(s, &obj->subscribers, list) {
285 blob_buf_init(&b, 0);
287 blob_put_int8(&b, UBUS_ATTR_NO_REPLY, 1);
288 ubusd_forward_invoke(s->subscriber, method, ub, attr[UBUS_ATTR_DATA]);
295 static struct ubus_client *ubusd_get_client_by_id(uint32_t id)
297 struct ubus_id *clid;
299 clid = ubus_find_id(&clients, id);
303 return container_of(clid, struct ubus_client, id);
306 static int ubusd_handle_response(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
308 struct ubus_object *obj;
310 if (!attr[UBUS_ATTR_OBJID] ||
311 (ub->hdr.type == UBUS_MSG_STATUS && !attr[UBUS_ATTR_STATUS]) ||
312 (ub->hdr.type == UBUS_MSG_DATA && !attr[UBUS_ATTR_DATA]))
315 obj = ubusd_find_object(blob_get_u32(attr[UBUS_ATTR_OBJID]));
319 if (cl != obj->client)
322 cl = ubusd_get_client_by_id(ub->hdr.peer);
326 ub->hdr.peer = blob_get_u32(attr[UBUS_ATTR_OBJID]);
327 ubus_msg_send(cl, ub, true);
335 static int ubusd_handle_add_watch(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
337 struct ubus_object *obj, *target;
339 if (!attr[UBUS_ATTR_OBJID] || !attr[UBUS_ATTR_TARGET])
340 return UBUS_STATUS_INVALID_ARGUMENT;
342 obj = ubusd_find_object(blob_get_u32(attr[UBUS_ATTR_OBJID]));
344 return UBUS_STATUS_NOT_FOUND;
346 if (cl != obj->client)
347 return UBUS_STATUS_INVALID_ARGUMENT;
349 target = ubusd_find_object(blob_get_u32(attr[UBUS_ATTR_TARGET]));
351 return UBUS_STATUS_NOT_FOUND;
353 if (cl == target->client)
354 return UBUS_STATUS_INVALID_ARGUMENT;
356 ubus_subscribe(obj, target);
360 static int ubusd_handle_remove_watch(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
362 struct ubus_object *obj;
363 struct ubus_subscription *s;
366 if (!attr[UBUS_ATTR_OBJID] || !attr[UBUS_ATTR_TARGET])
367 return UBUS_STATUS_INVALID_ARGUMENT;
369 obj = ubusd_find_object(blob_get_u32(attr[UBUS_ATTR_OBJID]));
371 return UBUS_STATUS_NOT_FOUND;
373 if (cl != obj->client)
374 return UBUS_STATUS_INVALID_ARGUMENT;
376 id = blob_get_u32(attr[UBUS_ATTR_TARGET]);
377 list_for_each_entry(s, &obj->target_list, target_list) {
378 if (s->target->id.id != id)
385 return UBUS_STATUS_NOT_FOUND;
388 static const ubus_cmd_cb handlers[__UBUS_MSG_LAST] = {
389 [UBUS_MSG_PING] = ubusd_send_pong,
390 [UBUS_MSG_ADD_OBJECT] = ubusd_handle_add_object,
391 [UBUS_MSG_REMOVE_OBJECT] = ubusd_handle_remove_object,
392 [UBUS_MSG_LOOKUP] = ubusd_handle_lookup,
393 [UBUS_MSG_INVOKE] = ubusd_handle_invoke,
394 [UBUS_MSG_STATUS] = ubusd_handle_response,
395 [UBUS_MSG_DATA] = ubusd_handle_response,
396 [UBUS_MSG_SUBSCRIBE] = ubusd_handle_add_watch,
397 [UBUS_MSG_UNSUBSCRIBE] = ubusd_handle_remove_watch,
398 [UBUS_MSG_NOTIFY] = ubusd_handle_notify,
401 void ubusd_proto_receive_message(struct ubus_client *cl, struct ubus_msg_buf *ub)
403 ubus_cmd_cb cb = NULL;
406 retmsg->hdr.seq = ub->hdr.seq;
407 retmsg->hdr.peer = ub->hdr.peer;
409 if (ub->hdr.type < __UBUS_MSG_LAST)
410 cb = handlers[ub->hdr.type];
413 ret = cb(cl, ub, ubus_parse_msg(ub->data));
415 ret = UBUS_STATUS_INVALID_COMMAND;
422 *retmsg_data = htonl(ret);
423 ubus_msg_send(cl, retmsg, false);
426 struct ubus_client *ubusd_proto_new_client(int fd, uloop_fd_handler cb)
428 struct ubus_client *cl;
430 cl = calloc(1, sizeof(*cl));
434 INIT_LIST_HEAD(&cl->objects);
438 if (!ubus_alloc_id(&clients, &cl->id, 0))
441 if (!ubusd_send_hello(cl))
447 ubus_free_id(&clients, &cl->id);
453 void ubusd_proto_free_client(struct ubus_client *cl)
455 struct ubus_object *obj;
457 while (!list_empty(&cl->objects)) {
458 obj = list_first_entry(&cl->objects, struct ubus_object, list);
459 ubusd_free_object(obj);
462 ubus_free_id(&clients, &cl->id);
465 void ubus_notify_subscription(struct ubus_object *obj)
467 bool active = !list_empty(&obj->subscribers);
468 struct ubus_msg_buf *ub;
470 blob_buf_init(&b, 0);
471 blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
472 blob_put_int8(&b, UBUS_ATTR_ACTIVE, active);
474 ub = ubus_msg_from_blob(false);
475 ubus_msg_init(ub, UBUS_MSG_NOTIFY, ++obj->invoke_seq, 0);
476 ubus_msg_send(obj->client, ub, true);
479 void ubus_notify_unsubscribe(struct ubus_subscription *s)
481 struct ubus_msg_buf *ub;
483 blob_buf_init(&b, 0);
484 blob_put_int32(&b, UBUS_ATTR_OBJID, s->subscriber->id.id);
485 blob_put_int32(&b, UBUS_ATTR_TARGET, s->target->id.id);
487 ub = ubus_msg_from_blob(false);
488 ubus_msg_init(ub, UBUS_MSG_UNSUBSCRIBE, ++s->subscriber->invoke_seq, 0);
489 ubus_msg_send(s->subscriber->client, ub, true);
494 static void __init ubusd_proto_init(void)
496 ubus_init_id_tree(&clients);
498 blob_buf_init(&b, 0);
499 blob_put_int32(&b, UBUS_ATTR_STATUS, 0);
501 retmsg = ubus_msg_from_blob(false);
505 retmsg->hdr.type = UBUS_MSG_STATUS;
506 retmsg_data = blob_data(blob_data(retmsg->data));