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- /*
- * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
- * Copyright (C) 2013 John Crispin <blogic@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 <stdlib.h>
- #include <unistd.h>
- #include <libubox/blobmsg_json.h>
- #include "../procd.h"
- struct watch_object {
- struct list_head list;
- void *id;
- char *name;
- };
- static struct ubus_event_handler watch_event;
- static struct ubus_subscriber watch_subscribe;
- static LIST_HEAD(watch_objects);
- static void watch_subscribe_cb(struct ubus_context *ctx, struct ubus_event_handler *ev,
- const char *type, struct blob_attr *msg)
- {
- static const struct blobmsg_policy policy = {
- "path", BLOBMSG_TYPE_STRING
- };
- struct watch_object *o;
- struct blob_attr *attr;
- const char *path;
- DEBUG(3, "ubus event %s\n", type);
- if (strcmp(type, "ubus.object.add") != 0)
- return;
- blobmsg_parse(&policy, 1, &attr, blob_data(msg), blob_len(msg));
- if (!attr)
- return;
- path = blobmsg_data(attr);
- DEBUG(3, "ubus path %s\n", path);
- list_for_each_entry(o, &watch_objects, list) {
- unsigned int id;
- if (strcmp(o->name, path))
- continue;
- if (ubus_lookup_id(ctx, path, &id))
- continue;
- if (!ubus_subscribe(ctx, &watch_subscribe, id))
- return;
- ERROR("failed to subscribe %d\n", id);
- }
- }
- void
- watch_add(const char *_name, void *id)
- {
- int len = strlen(_name);
- char *name;
- struct watch_object *o = calloc_a(sizeof(*o), &name, len + 1);
- o->name = name;
- strcpy(name, _name);
- o->id = id;
- list_add(&o->list, &watch_objects);
- }
- void
- watch_del(void *id)
- {
- struct watch_object *t, *n;
- list_for_each_entry_safe(t, n, &watch_objects, list) {
- if (t->id != id)
- continue;
- list_del(&t->list);
- free(t);
- }
- }
- static int
- watch_notify_cb(struct ubus_context *ctx, struct ubus_object *obj,
- struct ubus_request_data *req, const char *method,
- struct blob_attr *msg)
- {
- if (debug >= 3) {
- char *str;
- str = blobmsg_format_json(msg, true);
- DEBUG(3, "Received ubus notify '%s': %s\n", method, str);
- free(str);
- }
- trigger_event(method, msg);
- return 0;
- }
- void
- watch_ubus(struct ubus_context *ctx)
- {
- watch_event.cb = watch_subscribe_cb;
- watch_subscribe.cb = watch_notify_cb;
- if (ubus_register_subscriber(ctx, &watch_subscribe))
- ERROR("failed to register ubus subscriber\n");
- if (ubus_register_event_handler(ctx, &watch_event, "ubus.object.add"))
- ERROR("failed to add ubus event handler\n");
- }
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