4 static struct avl_tree patterns;
5 static struct ubus_object *event_obj;
6 static int event_seq = 0;
7 static int obj_event_seq = 1;
10 struct list_head list;
11 struct ubus_object *obj;
16 static void ubusd_delete_event_source(struct event_source *evs)
19 avl_delete(&patterns, &evs->avl);
23 void ubusd_event_cleanup_object(struct ubus_object *obj)
25 struct event_source *ev;
27 while (!list_empty(&obj->events)) {
28 ev = list_first_entry(&obj->events, struct event_source, list);
29 ubusd_delete_event_source(ev);
39 static struct blobmsg_policy evr_policy[] = {
40 [EVREG_PATTERN] = { .name = "pattern", .type = BLOBMSG_TYPE_STRING },
41 [EVREG_OBJECT] = { .name = "object", .type = BLOBMSG_TYPE_INT32 },
44 static int ubusd_alloc_event_pattern(struct ubus_client *cl, struct blob_attr *msg)
46 struct event_source *ev;
47 struct ubus_object *obj;
48 struct blob_attr *attr[EVREG_LAST];
54 blobmsg_parse(evr_policy, EVREG_LAST, attr, blob_data(msg), blob_len(msg));
55 if (!attr[EVREG_OBJECT] || !attr[EVREG_PATTERN])
56 return UBUS_STATUS_INVALID_ARGUMENT;
58 id = blobmsg_get_u32(attr[EVREG_OBJECT]);
59 if (id < UBUS_SYSTEM_OBJECT_MAX)
60 return UBUS_STATUS_PERMISSION_DENIED;
62 obj = ubusd_find_object(id);
64 return UBUS_STATUS_NOT_FOUND;
66 if (obj->client != cl)
67 return UBUS_STATUS_PERMISSION_DENIED;
69 pattern = blobmsg_data(attr[EVREG_PATTERN]);
71 len = strlen(pattern);
72 if (pattern[len - 1] == '*') {
78 ev = calloc(1, sizeof(*ev) + len + 1);
80 return UBUS_STATUS_NO_DATA;
82 list_add(&ev->list, &obj->events);
84 ev->partial = partial;
85 name = (char *) (ev + 1);
86 strcpy(name, pattern);
88 avl_insert(&patterns, &ev->avl);
93 typedef struct ubus_msg_buf *(*event_fill_cb)(void *priv, const char *id);
95 static void ubusd_send_event_msg(struct ubus_msg_buf **ub, struct ubus_client *cl,
96 struct ubus_object *obj, const char *id,
97 event_fill_cb fill_cb, void *cb_priv)
101 /* do not loop back events */
102 if (obj->client == cl)
105 /* do not send duplicate events */
106 if (obj->event_seen == obj_event_seq)
109 obj->event_seen = obj_event_seq;
112 *ub = fill_cb(cb_priv, id);
113 (*ub)->hdr.type = UBUS_MSG_INVOKE;
117 objid_ptr = blob_data(blob_data((*ub)->data));
118 *objid_ptr = htonl(obj->id.id);
120 (*ub)->hdr.seq = ++event_seq;
121 ubus_msg_send(obj->client, *ub, false);
124 bool strmatch_len(const char *s1, const char *s2, int *len)
126 for (*len = 0; s1[*len] == s2[*len]; (*len)++)
133 static int ubusd_send_event(struct ubus_client *cl, const char *id,
134 event_fill_cb fill_cb, void *cb_priv)
136 struct ubus_msg_buf *ub = NULL;
137 struct event_source *ev;
143 * Since this tree is sorted alphabetically, we can only expect to find
144 * matching entries as long as the number of matching characters
145 * between the pattern string and our string is monotonically increasing.
147 avl_for_each_element(&patterns, ev, avl) {
148 const char *key = ev->avl.key;
152 full_match = strmatch_len(id, key, &cur_match_len);
153 if (cur_match_len < match_len)
156 match_len = cur_match_len;
162 if (match_len != strlen(key))
166 ubusd_send_event_msg(&ub, cl, ev->obj, id, fill_cb, cb_priv);
181 static struct blobmsg_policy ev_policy[] = {
182 [EVMSG_ID] = { .name = "id", .type = BLOBMSG_TYPE_STRING },
183 [EVMSG_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
186 static struct ubus_msg_buf *
187 ubusd_create_event_from_msg(void *priv, const char *id)
189 struct blob_attr *msg = priv;
191 blob_buf_init(&b, 0);
192 blob_put_int32(&b, UBUS_ATTR_OBJID, 0);
193 blob_put_string(&b, UBUS_ATTR_METHOD, id);
194 blob_put(&b, UBUS_ATTR_DATA, blobmsg_data(msg), blobmsg_data_len(msg));
196 return ubus_msg_new(b.head, blob_raw_len(b.head), true);
199 static int ubusd_forward_event(struct ubus_client *cl, struct blob_attr *msg)
201 struct blob_attr *data;
202 struct blob_attr *attr[EVMSG_LAST];
205 blobmsg_parse(ev_policy, EVMSG_LAST, attr, blob_data(msg), blob_len(msg));
206 if (!attr[EVMSG_ID] || !attr[EVMSG_DATA])
207 return UBUS_STATUS_INVALID_ARGUMENT;
209 id = blobmsg_data(attr[EVMSG_ID]);
210 data = attr[EVMSG_DATA];
212 if (!strncmp(id, "ubus.", 5))
213 return UBUS_STATUS_PERMISSION_DENIED;
215 return ubusd_send_event(cl, id, ubusd_create_event_from_msg, data);
218 static int ubusd_event_recv(struct ubus_client *cl, const char *method, struct blob_attr *msg)
220 if (!strcmp(method, "register"))
221 return ubusd_alloc_event_pattern(cl, msg);
223 if (!strcmp(method, "send"))
224 return ubusd_forward_event(cl, msg);
226 return UBUS_STATUS_INVALID_COMMAND;
229 static struct ubus_msg_buf *
230 ubusd_create_object_event_msg(void *priv, const char *id)
232 struct ubus_object *obj = priv;
235 blob_buf_init(&b, 0);
236 blob_put_int32(&b, UBUS_ATTR_OBJID, 0);
237 blob_put_string(&b, UBUS_ATTR_METHOD, id);
238 s = blob_nest_start(&b, UBUS_ATTR_DATA);
239 blobmsg_add_u32(&b, "id", obj->id.id);
240 blobmsg_add_string(&b, "path", obj->path.key);
241 blob_nest_end(&b, s);
243 return ubus_msg_new(b.head, blob_raw_len(b.head), true);
246 void ubusd_send_obj_event(struct ubus_object *obj, bool add)
248 const char *id = add ? "ubus.object.add" : "ubus.object.remove";
250 ubusd_send_event(NULL, id, ubusd_create_object_event_msg, obj);
253 void ubusd_event_init(void)
255 ubus_init_string_tree(&patterns, true);
256 event_obj = ubusd_create_object_internal(NULL, UBUS_SYSTEM_OBJECT_EVENT);
257 event_obj->recv_msg = ubusd_event_recv;