ubusd_obj.c

   1 /*
   2  * Copyright (C) 2011 Felix Fietkau <nbd@openwrt.org>
   3  *
   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
   7  *
   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.
  12  */
  13
  14 #include "ubusd.h"
  15 #include "ubusd_obj.h"
  16
  17 struct avl_tree obj_types;
  18 struct avl_tree objects;
  19 struct avl_tree path;
  20
  21 static void ubus_unref_object_type(struct ubus_object_type *type)
  22 {
  23         struct ubus_method *m;
  24
  25         if (--type->refcount > 0)
  26                 return;
  27
  28         while (!list_empty(&type->methods)) {
  29                 m = list_first_entry(&type->methods, struct ubus_method, list);
  30                 list_del(&m->list);
  31                 free(m);
  32         }
  33
  34         ubus_free_id(&obj_types, &type->id);
  35         free(type);
  36 }
  37
  38 static bool ubus_create_obj_method(struct ubus_object_type *type, struct blob_attr *attr)
  39 {
  40         struct ubus_method *m;
  41         int bloblen = blob_raw_len(attr);
  42
  43         m = calloc(1, sizeof(*m) + bloblen);
  44         if (!m)
  45                 return false;
  46
  47         list_add_tail(&m->list, &type->methods);
  48         memcpy(m->data, attr, bloblen);
  49         m->name = blobmsg_name(m->data);
  50
  51         return true;
  52 }
  53
  54 static struct ubus_object_type *ubus_create_obj_type(struct blob_attr *sig)
  55 {
  56         struct ubus_object_type *type;
  57         struct blob_attr *pos;
  58         int rem;
  59
  60         type = calloc(1, sizeof(*type));
  61         type->refcount = 1;
  62
  63         if (!ubus_alloc_id(&obj_types, &type->id, 0))
  64                 goto error_free;
  65
  66         INIT_LIST_HEAD(&type->methods);
  67
  68         blob_for_each_attr(pos, sig, rem) {
  69                 if (!blobmsg_check_attr(pos, true))
  70                         goto error_unref;
  71
  72                 if (!ubus_create_obj_method(type, pos))
  73                         goto error_unref;
  74         }
  75
  76         return type;
  77
  78 error_unref:
  79         ubus_unref_object_type(type);
  80         return NULL;
  81
  82 error_free:
  83         free(type);
  84         return NULL;
  85 }
  86
  87 static struct ubus_object_type *ubus_get_obj_type(uint32_t obj_id)
  88 {
  89         struct ubus_object_type *type;
  90         struct ubus_id *id;
  91
  92         id = ubus_find_id(&obj_types, obj_id);
  93         if (!id)
  94                 return NULL;
  95
  96         type = container_of(id, struct ubus_object_type, id);
  97         type->refcount++;
  98         return type;
  99 }
 100
 101 struct ubus_object *ubusd_create_object_internal(struct ubus_object_type *type, uint32_t id)
 102 {
 103         struct ubus_object *obj;
 104
 105         obj = calloc(1, sizeof(*obj));
 106         if (!obj)
 107                 return NULL;
 108
 109         if (!ubus_alloc_id(&objects, &obj->id, id))
 110                 goto error_free;
 111
 112         obj->type = type;
 113         INIT_LIST_HEAD(&obj->list);
 114         INIT_LIST_HEAD(&obj->events);
 115         if (type)
 116                 type->refcount++;
 117
 118         return obj;
 119
 120 error_free:
 121         free(obj);
 122         return NULL;
 123 }
 124
 125 struct ubus_object *ubusd_create_object(struct ubus_client *cl, struct blob_attr **attr)
 126 {
 127         struct ubus_object *obj;
 128         struct ubus_object_type *type = NULL;
 129
 130         if (attr[UBUS_ATTR_OBJTYPE])
 131                 type = ubus_get_obj_type(blob_get_u32(attr[UBUS_ATTR_OBJTYPE]));
 132         else if (attr[UBUS_ATTR_SIGNATURE])
 133                 type = ubus_create_obj_type(attr[UBUS_ATTR_SIGNATURE]);
 134
 135         obj = ubusd_create_object_internal(type, 0);
 136         if (type)
 137                 ubus_unref_object_type(type);
 138
 139         if (!obj)
 140                 return NULL;
 141
 142         if (attr[UBUS_ATTR_OBJPATH]) {
 143                 obj->path.key = strdup(blob_data(attr[UBUS_ATTR_OBJPATH]));
 144                 if (!obj->path.key)
 145                         goto free;
 146
 147                 if (avl_insert(&path, &obj->path) != 0) {
 148                         free((void *) obj->path.key);
 149                         obj->path.key = NULL;
 150                         goto free;
 151                 }
 152                 ubusd_send_obj_event(obj, true);
 153         }
 154
 155         obj->client = cl;
 156         list_add(&obj->list, &cl->objects);
 157
 158         return obj;
 159
 160 free:
 161         ubusd_free_object(obj);
 162         return NULL;
 163 }
 164
 165 void ubusd_free_object(struct ubus_object *obj)
 166 {
 167         ubusd_event_cleanup_object(obj);
 168         if (obj->path.key) {
 169                 ubusd_send_obj_event(obj, false);
 170                 avl_delete(&path, &obj->path);
 171                 free((void *) obj->path.key);
 172         }
 173         if (!list_empty(&obj->list))
 174                 list_del(&obj->list);
 175         ubus_free_id(&objects, &obj->id);
 176         if (obj->type)
 177                 ubus_unref_object_type(obj->type);
 178         free(obj);
 179 }
 180
 181 static void __init ubusd_obj_init(void)
 182 {
 183         ubus_init_id_tree(&objects);
 184         ubus_init_id_tree(&obj_types);
 185         ubus_init_string_tree(&path, false);
 186         ubusd_event_init();
 187 }