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>
17 static struct avl_tree patterns;
18 static struct ubus_object *event_obj;
19 static int event_seq = 0;
20 static int obj_event_seq = 1;
23 struct list_head list;
24 struct ubus_object *obj;
29 static void ubusd_delete_event_source(struct event_source *evs)
32 avl_delete(&patterns, &evs->avl);
36 void ubusd_event_cleanup_object(struct ubus_object *obj)
38 struct event_source *ev;
40 while (!list_empty(&obj->events)) {
41 ev = list_first_entry(&obj->events, struct event_source, list);
42 ubusd_delete_event_source(ev);
52 static struct blobmsg_policy evr_policy[] = {
53 [EVREG_PATTERN] = { .name = "pattern", .type = BLOBMSG_TYPE_STRING },
54 [EVREG_OBJECT] = { .name = "object", .type = BLOBMSG_TYPE_INT32 },
57 static int ubusd_alloc_event_pattern(struct ubus_client *cl, struct blob_attr *msg)
59 struct event_source *ev;
60 struct ubus_object *obj;
61 struct blob_attr *attr[EVREG_LAST];
67 blobmsg_parse(evr_policy, EVREG_LAST, attr, blob_data(msg), blob_len(msg));
68 if (!attr[EVREG_OBJECT] || !attr[EVREG_PATTERN])
69 return UBUS_STATUS_INVALID_ARGUMENT;
71 id = blobmsg_get_u32(attr[EVREG_OBJECT]);
72 if (id < UBUS_SYSTEM_OBJECT_MAX)
73 return UBUS_STATUS_PERMISSION_DENIED;
75 obj = ubusd_find_object(id);
77 return UBUS_STATUS_NOT_FOUND;
79 if (obj->client != cl)
80 return UBUS_STATUS_PERMISSION_DENIED;
82 pattern = blobmsg_data(attr[EVREG_PATTERN]);
84 len = strlen(pattern);
85 if (pattern[len - 1] == '*') {
91 if (pattern[0] && ubusd_acl_check(cl, pattern, NULL, UBUS_ACL_LISTEN))
92 return UBUS_STATUS_PERMISSION_DENIED;
94 ev = calloc(1, sizeof(*ev) + len + 1);
96 return UBUS_STATUS_NO_DATA;
98 list_add(&ev->list, &obj->events);
100 ev->partial = partial;
101 name = (char *) (ev + 1);
102 strcpy(name, pattern);
104 avl_insert(&patterns, &ev->avl);
109 static void ubusd_send_event_msg(struct ubus_msg_buf **ub, struct ubus_client *cl,
110 struct ubus_object *obj, const char *id,
111 event_fill_cb fill_cb, void *cb_priv)
115 /* do not loop back events */
116 if (obj->client == cl)
119 /* do not send duplicate events */
120 if (obj->event_seen == obj_event_seq)
123 obj->event_seen = obj_event_seq;
126 *ub = fill_cb(cb_priv, id);
127 (*ub)->hdr.type = UBUS_MSG_INVOKE;
131 objid_ptr = blob_data(blob_data((*ub)->data));
132 *objid_ptr = htonl(obj->id.id);
134 (*ub)->hdr.seq = ++event_seq;
135 ubus_msg_send(obj->client, *ub);
138 int ubusd_send_event(struct ubus_client *cl, const char *id,
139 event_fill_cb fill_cb, void *cb_priv)
141 struct ubus_msg_buf *ub = NULL;
142 struct event_source *ev;
145 if (ubusd_acl_check(cl, id, NULL, UBUS_ACL_SEND))
146 return UBUS_STATUS_PERMISSION_DENIED;
151 * Since this tree is sorted alphabetically, we can only expect to find
152 * matching entries as long as the number of matching characters
153 * between the pattern string and our string is monotonically increasing.
155 avl_for_each_element(&patterns, ev, avl) {
156 const char *key = ev->avl.key;
160 full_match = ubus_strmatch_len(id, key, &cur_match_len);
161 if (cur_match_len < match_len)
164 match_len = cur_match_len;
170 if (match_len != (int) strlen(key))
174 ubusd_send_event_msg(&ub, cl, ev->obj, id, fill_cb, cb_priv);
189 static struct blobmsg_policy ev_policy[] = {
190 [EVMSG_ID] = { .name = "id", .type = BLOBMSG_TYPE_STRING },
191 [EVMSG_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
194 static struct ubus_msg_buf *
195 ubusd_create_event_from_msg(void *priv, const char *id)
197 struct blob_attr *msg = priv;
199 blob_buf_init(&b, 0);
200 blob_put_int32(&b, UBUS_ATTR_OBJID, 0);
201 blob_put_string(&b, UBUS_ATTR_METHOD, id);
202 blob_put(&b, UBUS_ATTR_DATA, blobmsg_data(msg), blobmsg_data_len(msg));
204 return ubus_msg_new(b.head, blob_raw_len(b.head), true);
207 static int ubusd_forward_event(struct ubus_client *cl, struct blob_attr *msg)
209 struct blob_attr *data;
210 struct blob_attr *attr[EVMSG_LAST];
213 blobmsg_parse(ev_policy, EVMSG_LAST, attr, blob_data(msg), blob_len(msg));
214 if (!attr[EVMSG_ID] || !attr[EVMSG_DATA])
215 return UBUS_STATUS_INVALID_ARGUMENT;
217 id = blobmsg_data(attr[EVMSG_ID]);
218 data = attr[EVMSG_DATA];
220 if (!strncmp(id, "ubus.", 5))
221 return UBUS_STATUS_PERMISSION_DENIED;
223 return ubusd_send_event(cl, id, ubusd_create_event_from_msg, data);
226 static int ubusd_event_recv(struct ubus_client *cl, struct ubus_msg_buf *ub, const char *method, struct blob_attr *msg)
228 if (!strcmp(method, "register"))
229 return ubusd_alloc_event_pattern(cl, msg);
231 if (!strcmp(method, "send"))
232 return ubusd_forward_event(cl, msg);
234 return UBUS_STATUS_INVALID_COMMAND;
237 static struct ubus_msg_buf *
238 ubusd_create_object_event_msg(void *priv, const char *id)
240 struct ubus_object *obj = priv;
243 blob_buf_init(&b, 0);
244 blob_put_int32(&b, UBUS_ATTR_OBJID, 0);
245 blob_put_string(&b, UBUS_ATTR_METHOD, id);
246 s = blob_nest_start(&b, UBUS_ATTR_DATA);
247 blobmsg_add_u32(&b, "id", obj->id.id);
248 blobmsg_add_string(&b, "path", obj->path.key);
249 blob_nest_end(&b, s);
251 return ubus_msg_new(b.head, blob_raw_len(b.head), true);
254 void ubusd_send_obj_event(struct ubus_object *obj, bool add)
256 const char *id = add ? "ubus.object.add" : "ubus.object.remove";
258 ubusd_send_event(NULL, id, ubusd_create_object_event_msg, obj);
261 void ubusd_event_init(void)
263 ubus_init_string_tree(&patterns, true);
264 event_obj = ubusd_create_object_internal(NULL, UBUS_SYSTEM_OBJECT_EVENT);
265 if (event_obj != NULL)
266 event_obj->recv_msg = ubusd_event_recv;