ubusd_obj.c

   1 #include "ubusd.h"
   2 #include "ubusd_obj.h"
   3
   4 struct avl_tree obj_types;
   5 struct avl_tree objects;
   6 struct avl_tree path;
   7
   8 static void ubus_unref_object_type(struct ubus_object_type *type)
   9 {
  10         struct ubus_method *m;
  11
  12         if (--type->refcount > 0)
  13                 return;
  14
  15         while (!list_empty(&type->methods)) {
  16                 m = list_first_entry(&type->methods, struct ubus_method, list);
  17                 list_del(&m->list);
  18                 free(m);
  19         }
  20
  21         ubus_free_id(&obj_types, &type->id);
  22         free(type);
  23 }
  24
  25 static bool ubus_create_obj_method(struct ubus_object_type *type, struct blob_attr *attr)
  26 {
  27         struct ubus_method *m;
  28         int bloblen = blob_raw_len(attr);
  29
  30         m = calloc(1, sizeof(*m) + bloblen);
  31         if (!m)
  32                 return false;
  33
  34         list_add(&m->list, &type->methods);
  35         memcpy(m->data, attr, bloblen);
  36         m->name = blobmsg_name(m->data);
  37
  38         return true;
  39 }
  40
  41 static struct ubus_object_type *ubus_create_obj_type(struct blob_attr *sig)
  42 {
  43         struct ubus_object_type *type;
  44         struct blob_attr *pos;
  45         int rem;
  46
  47         type = calloc(1, sizeof(*type));
  48         type->refcount = 1;
  49
  50         if (!ubus_alloc_id(&obj_types, &type->id))
  51                 goto error_free;
  52
  53         INIT_LIST_HEAD(&type->methods);
  54
  55         blob_for_each_attr(pos, sig, rem) {
  56                 if (!blobmsg_check_attr(pos, true))
  57                         goto error_unref;
  58
  59                 if (!ubus_create_obj_method(type, pos))
  60                         goto error_unref;
  61         }
  62
  63         return type;
  64
  65 error_unref:
  66         ubus_unref_object_type(type);
  67         return NULL;
  68
  69 error_free:
  70         free(type);
  71         return NULL;
  72 }
  73
  74 static struct ubus_object_type *ubus_get_obj_type(uint32_t obj_id)
  75 {
  76         struct ubus_object_type *type;
  77         struct ubus_id *id;
  78
  79         id = ubus_find_id(&obj_types, obj_id);
  80         if (!id)
  81                 return NULL;
  82
  83         type = container_of(id, struct ubus_object_type, id);
  84         type->refcount++;
  85         return type;
  86 }
  87
  88 struct ubus_object *ubusd_create_object(struct ubus_client *cl, struct blob_attr **attr)
  89 {
  90         struct ubus_object *obj;
  91         struct ubus_object_type *type = NULL;
  92
  93         if (attr[UBUS_ATTR_OBJTYPE])
  94                 type = ubus_get_obj_type(blob_get_int32(attr[UBUS_ATTR_OBJTYPE]));
  95         else if (attr[UBUS_ATTR_SIGNATURE])
  96                 type = ubus_create_obj_type(attr[UBUS_ATTR_SIGNATURE]);
  97
  98         if (!type)
  99                 return NULL;
 100
 101         obj = calloc(1, sizeof(*obj));
 102         if (!ubus_alloc_id(&objects, &obj->id))
 103                 goto error_free;
 104
 105         if (attr[UBUS_ATTR_OBJPATH]) {
 106                 obj->path.key = strdup(blob_data(attr[UBUS_ATTR_OBJPATH]));
 107                 if (avl_insert(&path, &obj->path) != 0)
 108                         goto error_del_id;
 109         }
 110
 111         obj->type = type;
 112         list_add(&obj->list, &cl->objects);
 113
 114         return obj;
 115
 116 error_del_id:
 117         free(obj->path.key);
 118         ubus_free_id(&objects, &obj->id);
 119 error_free:
 120         ubus_unref_object_type(type);
 121         free(obj);
 122         return NULL;
 123 }
 124
 125 void ubusd_free_object(struct ubus_object *obj)
 126 {
 127         if (obj->path.key) {
 128                 avl_delete(&path, &obj->path);
 129                 free(obj->path.key);
 130         }
 131         list_del(&obj->list);
 132         ubus_free_id(&objects, &obj->id);
 133         ubus_unref_object_type(obj->type);
 134         free(obj);
 135 }
 136
 137 static int ubus_cmp_path(const void *k1, const void *k2, void *ptr)
 138 {
 139         return strcmp(k1, k2);
 140 }
 141
 142 static void __init ubusd_obj_init(void)
 143 {
 144         ubus_init_id_tree(&objects);
 145         ubus_init_id_tree(&obj_types);
 146         avl_init(&path, ubus_cmp_path, false, NULL);
 147 }