+typedef struct ubus_msg_buf *(*event_fill_cb)(void *priv, const char *id);
+
+static void ubusd_send_event_msg(struct ubus_msg_buf **ub, struct ubus_client *cl,
+ struct ubus_object *obj, const char *id,
+ event_fill_cb fill_cb, void *cb_priv)
+{
+ uint32_t *objid_ptr;
+
+ /* do not loop back events */
+ if (obj->client == cl)
+ return;
+
+ /* do not send duplicate events */
+ if (obj->event_seen == obj_event_seq)
+ return;
+
+ obj->event_seen = obj_event_seq;
+
+ if (!*ub) {
+ *ub = fill_cb(cb_priv, id);
+ (*ub)->hdr.type = UBUS_MSG_INVOKE;
+ (*ub)->hdr.peer = 0;
+ }
+
+ objid_ptr = blob_data(blob_data((*ub)->data));
+ *objid_ptr = htonl(obj->id.id);
+
+ (*ub)->hdr.seq = ++event_seq;
+ ubus_msg_send(obj->client, *ub, false);
+}
+
+static bool strmatch_len(const char *s1, const char *s2, int *len)
+{
+ for (*len = 0; s1[*len] == s2[*len]; (*len)++)
+ if (!s1[*len])
+ return true;
+
+ return false;
+}
+
+static int ubusd_send_event(struct ubus_client *cl, const char *id,
+ event_fill_cb fill_cb, void *cb_priv)
+{
+ struct ubus_msg_buf *ub = NULL;
+ struct event_source *ev;
+ int match_len = 0;
+
+ obj_event_seq++;
+
+ /*
+ * Since this tree is sorted alphabetically, we can only expect to find
+ * matching entries as long as the number of matching characters
+ * between the pattern string and our string is monotonically increasing.
+ */
+ avl_for_each_element(&patterns, ev, avl) {
+ const char *key = ev->avl.key;
+ int cur_match_len;
+ bool full_match;
+
+ full_match = strmatch_len(id, key, &cur_match_len);
+ if (cur_match_len < match_len)
+ break;
+
+ match_len = cur_match_len;
+
+ if (!full_match) {
+ if (!ev->partial)
+ continue;
+
+ if (match_len != strlen(key))
+ continue;
+ }
+
+ ubusd_send_event_msg(&ub, cl, ev->obj, id, fill_cb, cb_priv);
+ }
+
+ if (ub)
+ ubus_msg_free(ub);
+
+ return 0;
+}
+
+enum {
+ EVMSG_ID,
+ EVMSG_DATA,
+ EVMSG_LAST,
+};
+
+static struct blobmsg_policy ev_policy[] = {
+ [EVMSG_ID] = { .name = "id", .type = BLOBMSG_TYPE_STRING },
+ [EVMSG_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
+};
+
+static struct ubus_msg_buf *
+ubusd_create_event_from_msg(void *priv, const char *id)
+{
+ struct blob_attr *msg = priv;
+
+ blob_buf_init(&b, 0);
+ blob_put_int32(&b, UBUS_ATTR_OBJID, 0);
+ blob_put_string(&b, UBUS_ATTR_METHOD, id);
+ blob_put(&b, UBUS_ATTR_DATA, blobmsg_data(msg), blobmsg_data_len(msg));
+
+ return ubus_msg_new(b.head, blob_raw_len(b.head), true);
+}
+
+static int ubusd_forward_event(struct ubus_client *cl, struct blob_attr *msg)
+{
+ struct blob_attr *data;
+ struct blob_attr *attr[EVMSG_LAST];
+ const char *id;
+
+ blobmsg_parse(ev_policy, EVMSG_LAST, attr, blob_data(msg), blob_len(msg));
+ if (!attr[EVMSG_ID] || !attr[EVMSG_DATA])
+ return UBUS_STATUS_INVALID_ARGUMENT;
+
+ id = blobmsg_data(attr[EVMSG_ID]);
+ data = attr[EVMSG_DATA];
+
+ if (!strncmp(id, "ubus.", 5))
+ return UBUS_STATUS_PERMISSION_DENIED;
+
+ return ubusd_send_event(cl, id, ubusd_create_event_from_msg, data);
+}
+
+static int ubusd_event_recv(struct ubus_client *cl, struct ubus_msg_buf *ub, const char *method, struct blob_attr *msg)