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 },
34 static struct blob_attr **ubus_parse_msg(struct blob_attr *msg)
36 blob_parse(msg, attrbuf, ubus_policy, UBUS_ATTR_MAX);
40 static void ubus_msg_init(struct ubus_msg_buf *ub, uint8_t type, uint16_t seq, uint32_t peer)
48 static struct ubus_msg_buf *ubus_msg_from_blob(bool shared)
50 return ubus_msg_new(b.head, blob_raw_len(b.head), shared);
53 static struct ubus_msg_buf *ubus_reply_from_blob(struct ubus_msg_buf *ub, bool shared)
55 struct ubus_msg_buf *new;
57 new = ubus_msg_from_blob(shared);
61 ubus_msg_init(new, UBUS_MSG_DATA, ub->hdr.seq, ub->hdr.peer);
65 static bool ubusd_send_hello(struct ubus_client *cl)
67 struct ubus_msg_buf *ub;
70 ub = ubus_msg_from_blob(true);
74 ubus_msg_init(ub, UBUS_MSG_HELLO, 0, cl->id.id);
75 ubus_msg_send(cl, ub, true);
79 static int ubusd_send_pong(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
81 ub->hdr.type = UBUS_MSG_DATA;
82 ubus_msg_send(cl, ub, false);
86 static int ubusd_handle_remove_object(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
88 struct ubus_object *obj;
90 if (!attr[UBUS_ATTR_OBJID])
91 return UBUS_STATUS_INVALID_ARGUMENT;
93 obj = ubusd_find_object(blob_get_u32(attr[UBUS_ATTR_OBJID]));
95 return UBUS_STATUS_NOT_FOUND;
97 if (obj->client != cl)
98 return UBUS_STATUS_PERMISSION_DENIED;
100 blob_buf_init(&b, 0);
101 blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
103 /* check if we're removing the object type as well */
104 if (obj->type && obj->type->refcount == 1)
105 blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id.id);
107 ubusd_free_object(obj);
109 ub = ubus_reply_from_blob(ub, true);
111 return UBUS_STATUS_NO_DATA;
113 ubus_msg_send(cl, ub, true);
117 static int ubusd_handle_add_object(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
119 struct ubus_object *obj;
121 obj = ubusd_create_object(cl, attr);
123 return UBUS_STATUS_INVALID_ARGUMENT;
125 blob_buf_init(&b, 0);
126 blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
127 if (attr[UBUS_ATTR_SIGNATURE])
128 blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id.id);
130 ub = ubus_reply_from_blob(ub, true);
132 return UBUS_STATUS_NO_DATA;
134 ubus_msg_send(cl, ub, true);
138 static void ubusd_send_obj(struct ubus_client *cl, struct ubus_msg_buf *ub, struct ubus_object *obj)
140 struct ubus_method *m;
143 blob_buf_init(&b, 0);
146 blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->path.key);
147 blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
148 blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id.id);
150 s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
151 list_for_each_entry(m, &obj->type->methods, list)
152 blob_put(&b, blob_id(m->data), blob_data(m->data), blob_len(m->data));
153 blob_nest_end(&b, s);
155 ub = ubus_reply_from_blob(ub, true);
159 ubus_msg_send(cl, ub, true);
162 static int ubusd_handle_lookup(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
164 struct ubus_object *obj;
166 bool wildcard = false;
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);
190 obj = avl_find_ge_element(&path, objpath, obj, path);
192 return UBUS_STATUS_NOT_FOUND;
194 while (!strncmp(objpath, obj->path.key, len)) {
196 ubusd_send_obj(cl, ub, obj);
197 if (obj == avl_last_element(&path, obj, path))
199 obj = avl_next_element(obj, path);
203 return UBUS_STATUS_NOT_FOUND;
208 static int ubusd_handle_invoke(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
210 struct ubus_object *obj = NULL;
214 if (!attr[UBUS_ATTR_METHOD] || !attr[UBUS_ATTR_OBJID])
215 return UBUS_STATUS_INVALID_ARGUMENT;
217 id = ubus_find_id(&objects, blob_get_u32(attr[UBUS_ATTR_OBJID]));
219 return UBUS_STATUS_NOT_FOUND;
221 obj = container_of(id, struct ubus_object, id);
223 method = blob_data(attr[UBUS_ATTR_METHOD]);
226 return obj->recv_msg(cl, method, attr[UBUS_ATTR_DATA]);
228 blob_buf_init(&b, 0);
229 blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
230 blob_put_string(&b, UBUS_ATTR_METHOD, method);
231 if (attr[UBUS_ATTR_DATA])
232 blob_put(&b, UBUS_ATTR_DATA, blob_data(attr[UBUS_ATTR_DATA]),
233 blob_len(attr[UBUS_ATTR_DATA]));
237 ub = ubus_reply_from_blob(ub, true);
239 return UBUS_STATUS_NO_DATA;
241 ub->hdr.type = UBUS_MSG_INVOKE;
242 ub->hdr.peer = cl->id.id;
243 ubus_msg_send(obj->client, ub, true);
248 static struct ubus_client *ubusd_get_client_by_id(uint32_t id)
250 struct ubus_id *clid;
252 clid = ubus_find_id(&clients, id);
256 return container_of(clid, struct ubus_client, id);
259 static int ubusd_handle_response(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
261 struct ubus_object *obj;
263 if (!attr[UBUS_ATTR_OBJID] ||
264 (ub->hdr.type == UBUS_MSG_STATUS && !attr[UBUS_ATTR_STATUS]) ||
265 (ub->hdr.type == UBUS_MSG_DATA && !attr[UBUS_ATTR_DATA]))
268 obj = ubusd_find_object(blob_get_u32(attr[UBUS_ATTR_OBJID]));
272 if (cl != obj->client)
275 cl = ubusd_get_client_by_id(ub->hdr.peer);
279 ub->hdr.peer = blob_get_u32(attr[UBUS_ATTR_OBJID]);
280 ubus_msg_send(cl, ub, true);
288 static const ubus_cmd_cb handlers[__UBUS_MSG_LAST] = {
289 [UBUS_MSG_PING] = ubusd_send_pong,
290 [UBUS_MSG_ADD_OBJECT] = ubusd_handle_add_object,
291 [UBUS_MSG_REMOVE_OBJECT] = ubusd_handle_remove_object,
292 [UBUS_MSG_LOOKUP] = ubusd_handle_lookup,
293 [UBUS_MSG_INVOKE] = ubusd_handle_invoke,
294 [UBUS_MSG_STATUS] = ubusd_handle_response,
295 [UBUS_MSG_DATA] = ubusd_handle_response,
298 void ubusd_proto_receive_message(struct ubus_client *cl, struct ubus_msg_buf *ub)
300 ubus_cmd_cb cb = NULL;
303 retmsg->hdr.seq = ub->hdr.seq;
304 retmsg->hdr.peer = ub->hdr.peer;
306 if (ub->hdr.type < __UBUS_MSG_LAST)
307 cb = handlers[ub->hdr.type];
310 ret = cb(cl, ub, ubus_parse_msg(ub->data));
312 ret = UBUS_STATUS_INVALID_COMMAND;
319 *retmsg_data = htonl(ret);
320 ubus_msg_send(cl, retmsg, false);
323 struct ubus_client *ubusd_proto_new_client(int fd, uloop_fd_handler cb)
325 struct ubus_client *cl;
327 cl = calloc(1, sizeof(*cl));
331 INIT_LIST_HEAD(&cl->objects);
335 if (!ubus_alloc_id(&clients, &cl->id, 0))
338 if (!ubusd_send_hello(cl))
344 ubus_free_id(&clients, &cl->id);
350 void ubusd_proto_free_client(struct ubus_client *cl)
352 struct ubus_object *obj;
354 while (!list_empty(&cl->objects)) {
355 obj = list_first_entry(&cl->objects, struct ubus_object, list);
356 ubusd_free_object(obj);
359 ubus_free_id(&clients, &cl->id);
362 static void __init ubusd_proto_init(void)
364 ubus_init_id_tree(&clients);
366 blob_buf_init(&b, 0);
367 blob_put_int32(&b, UBUS_ATTR_STATUS, 0);
369 retmsg = ubus_msg_from_blob(false);
373 retmsg->hdr.type = UBUS_MSG_STATUS;
374 retmsg_data = blob_data(blob_data(retmsg->data));