Mirror of the official OpenWrt ubus repository https://git.openwrt.org/project/ubus
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/*
* Copyright (C) 2011 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arpa/inet.h>
#include "ubusd.h"
static struct avl_tree patterns;
static struct ubus_object *event_obj;
static int event_seq = 0;
static int obj_event_seq = 1;
struct event_source {
struct list_head list;
struct ubus_object *obj;
struct avl_node avl;
bool partial;
};
static void ubusd_delete_event_source(struct event_source *evs)
{
list_del(&evs->list);
avl_delete(&patterns, &evs->avl);
free(evs);
}
void ubusd_event_cleanup_object(struct ubus_object *obj)
{
struct event_source *ev, *tmp;
list_for_each_entry_safe(ev, tmp, &obj->events, list) {
ubusd_delete_event_source(ev);
}
}
enum {
EVREG_PATTERN,
EVREG_OBJECT,
EVREG_LAST,
};
static struct blobmsg_policy evr_policy[] = {
[EVREG_PATTERN] = { .name = "pattern", .type = BLOBMSG_TYPE_STRING },
[EVREG_OBJECT] = { .name = "object", .type = BLOBMSG_TYPE_INT32 },
};
static int ubusd_alloc_event_pattern(struct ubus_client *cl, struct blob_attr *msg)
{
struct event_source *ev;
struct ubus_object *obj;
struct blob_attr *attr[EVREG_LAST];
char *pattern, *name;
uint32_t id;
bool partial = false;
int len;
blobmsg_parse(evr_policy, EVREG_LAST, attr, blob_data(msg), blob_len(msg));
if (!attr[EVREG_OBJECT] || !attr[EVREG_PATTERN])
return UBUS_STATUS_INVALID_ARGUMENT;
id = blobmsg_get_u32(attr[EVREG_OBJECT]);
if (id < UBUS_SYSTEM_OBJECT_MAX)
return UBUS_STATUS_PERMISSION_DENIED;
obj = ubusd_find_object(id);
if (!obj)
return UBUS_STATUS_NOT_FOUND;
if (obj->client != cl)
return UBUS_STATUS_PERMISSION_DENIED;
pattern = blobmsg_data(attr[EVREG_PATTERN]);
len = strlen(pattern);
if (pattern[len - 1] == '*') {
partial = true;
pattern[len - 1] = 0;
len--;
}
if (pattern[0] && ubusd_acl_check(cl, pattern, NULL, UBUS_ACL_LISTEN))
return UBUS_STATUS_PERMISSION_DENIED;
ev = calloc(1, sizeof(*ev) + len + 1);
if (!ev)
return UBUS_STATUS_NO_DATA;
list_add(&ev->list, &obj->events);
ev->obj = obj;
ev->partial = partial;
name = (char *) (ev + 1);
strcpy(name, pattern);
ev->avl.key = name;
avl_insert(&patterns, &ev->avl);
return 0;
}
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);
}
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;
if (ubusd_acl_check(cl, id, NULL, UBUS_ACL_SEND))
return UBUS_STATUS_PERMISSION_DENIED;
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 = ubus_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 != (int) 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)
{
if (!strcmp(method, "register"))
return ubusd_alloc_event_pattern(cl, msg);
if (!strcmp(method, "send"))
return ubusd_forward_event(cl, msg);
return UBUS_STATUS_INVALID_COMMAND;
}
static struct ubus_msg_buf *
ubusd_create_object_event_msg(void *priv, const char *id)
{
struct ubus_object *obj = priv;
void *s;
blob_buf_init(&b, 0);
blob_put_int32(&b, UBUS_ATTR_OBJID, 0);
blob_put_string(&b, UBUS_ATTR_METHOD, id);
s = blob_nest_start(&b, UBUS_ATTR_DATA);
blobmsg_add_u32(&b, "id", obj->id.id);
blobmsg_add_string(&b, "path", obj->path.key);
blob_nest_end(&b, s);
return ubus_msg_new(b.head, blob_raw_len(b.head), true);
}
void ubusd_send_obj_event(struct ubus_object *obj, bool add)
{
const char *id = add ? "ubus.object.add" : "ubus.object.remove";
ubusd_send_event(NULL, id, ubusd_create_object_event_msg, obj);
}
void ubusd_event_init(void)
{
ubus_init_string_tree(&patterns, true);
event_obj = ubusd_create_object_internal(NULL, UBUS_SYSTEM_OBJECT_EVENT);
if (event_obj != NULL)
event_obj->recv_msg = ubusd_event_recv;
}