libubus-obj.c

   1 /*
   2  * Copyright (C) 2011-2012 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 "libubus.h"
  15 #include "libubus-internal.h"
  16
  17 static void
  18 ubus_process_unsubscribe(struct ubus_context *ctx, struct ubus_msghdr *hdr,
  19                          struct ubus_object *obj, struct blob_attr **attrbuf)
  20 {
  21         struct ubus_subscriber *s;
  22
  23         if (!obj || !attrbuf[UBUS_ATTR_TARGET])
  24                 return;
  25
  26         if (obj->methods != &watch_method)
  27                 return;
  28
  29         s = container_of(obj, struct ubus_subscriber, obj);
  30         s->remove_cb(ctx, s, blob_get_u32(attrbuf[UBUS_ATTR_TARGET]));
  31 }
  32
  33 static void
  34 ubus_process_notify(struct ubus_context *ctx, struct ubus_msghdr *hdr,
  35                     struct ubus_object *obj, struct blob_attr **attrbuf)
  36 {
  37         if (!obj || !attrbuf[UBUS_ATTR_ACTIVE])
  38                 return;
  39
  40         obj->has_subscribers = blob_get_u8(attrbuf[UBUS_ATTR_ACTIVE]);
  41         if (obj->subscribe_cb)
  42                 obj->subscribe_cb(ctx, obj);
  43 }
  44 static void
  45 ubus_process_invoke(struct ubus_context *ctx, struct ubus_msghdr *hdr,
  46                     struct ubus_object *obj, struct blob_attr **attrbuf)
  47 {
  48         struct ubus_request_data req = {};
  49         int method;
  50         int ret;
  51
  52         if (!obj) {
  53                 ret = UBUS_STATUS_NOT_FOUND;
  54                 goto send;
  55         }
  56
  57         if (!attrbuf[UBUS_ATTR_METHOD]) {
  58                 ret = UBUS_STATUS_INVALID_ARGUMENT;
  59                 goto send;
  60         }
  61
  62         req.peer = hdr->peer;
  63         req.seq = hdr->seq;
  64         req.object = obj->id;
  65
  66         for (method = 0; method < obj->n_methods; method++)
  67                 if (!obj->methods[method].name ||
  68                     !strcmp(obj->methods[method].name,
  69                             blob_data(attrbuf[UBUS_ATTR_METHOD])))
  70                         goto found;
  71
  72         /* not found */
  73         ret = UBUS_STATUS_METHOD_NOT_FOUND;
  74         goto send;
  75
  76 found:
  77         ret = obj->methods[method].handler(ctx, obj, &req,
  78                                            blob_data(attrbuf[UBUS_ATTR_METHOD]),
  79                                            attrbuf[UBUS_ATTR_DATA]);
  80         if (req.deferred)
  81                 return;
  82
  83 send:
  84         ubus_complete_deferred_request(ctx, &req, ret);
  85 }
  86
  87 void __hidden ubus_process_obj_msg(struct ubus_context *ctx, struct ubus_msghdr *hdr)
  88 {
  89         void (*cb)(struct ubus_context *, struct ubus_msghdr *,
  90                    struct ubus_object *, struct blob_attr **);
  91         struct blob_attr **attrbuf;
  92         struct ubus_object *obj;
  93         uint32_t objid;
  94
  95         attrbuf = ubus_parse_msg(hdr->data);
  96         if (!attrbuf[UBUS_ATTR_OBJID])
  97                 return;
  98
  99         objid = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
 100         obj = avl_find_element(&ctx->objects, &objid, obj, avl);
 101
 102         switch (hdr->type) {
 103         case UBUS_MSG_INVOKE:
 104                 cb = ubus_process_invoke;
 105                 break;
 106         case UBUS_MSG_UNSUBSCRIBE:
 107                 cb = ubus_process_unsubscribe;
 108                 break;
 109         case UBUS_MSG_NOTIFY:
 110                 cb = ubus_process_notify;
 111                 break;
 112         default:
 113                 return;
 114         }
 115         cb(ctx, hdr, obj, attrbuf);
 116 }
 117
 118 static void ubus_add_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 119 {
 120         struct ubus_object *obj = req->priv;
 121         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 122
 123         if (!attrbuf[UBUS_ATTR_OBJID])
 124                 return;
 125
 126         obj->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
 127
 128         if (attrbuf[UBUS_ATTR_OBJTYPE])
 129                 obj->type->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJTYPE]);
 130
 131         obj->avl.key = &obj->id;
 132         avl_insert(&req->ctx->objects, &obj->avl);
 133 }
 134
 135 static void ubus_push_method_data(const struct ubus_method *m)
 136 {
 137         void *mtbl;
 138         int i;
 139
 140         mtbl = blobmsg_open_table(&b, m->name);
 141
 142         for (i = 0; i < m->n_policy; i++)
 143                 blobmsg_add_u32(&b, m->policy[i].name, m->policy[i].type);
 144
 145         blobmsg_close_table(&b, mtbl);
 146 }
 147
 148 static bool ubus_push_object_type(const struct ubus_object_type *type)
 149 {
 150         void *s;
 151         int i;
 152
 153         s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
 154
 155         for (i = 0; i < type->n_methods; i++)
 156                 ubus_push_method_data(&type->methods[i]);
 157
 158         blob_nest_end(&b, s);
 159
 160         return true;
 161 }
 162
 163 int ubus_add_object(struct ubus_context *ctx, struct ubus_object *obj)
 164 {
 165         struct ubus_request req;
 166         int ret;
 167
 168         blob_buf_init(&b, 0);
 169
 170         if (obj->name && obj->type) {
 171                 blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->name);
 172
 173                 if (obj->type->id)
 174                         blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id);
 175                 else if (!ubus_push_object_type(obj->type))
 176                         return UBUS_STATUS_INVALID_ARGUMENT;
 177         }
 178
 179         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_ADD_OBJECT, 0) < 0)
 180                 return UBUS_STATUS_INVALID_ARGUMENT;
 181
 182         req.raw_data_cb = ubus_add_object_cb;
 183         req.priv = obj;
 184         ret = ubus_complete_request(ctx, &req, 0);
 185         if (ret)
 186                 return ret;
 187
 188         if (!obj->id)
 189                 return UBUS_STATUS_NO_DATA;
 190
 191         return 0;
 192 }
 193
 194 static void ubus_remove_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 195 {
 196         struct ubus_object *obj = req->priv;
 197         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 198
 199         if (!attrbuf[UBUS_ATTR_OBJID])
 200                 return;
 201
 202         obj->id = 0;
 203
 204         if (attrbuf[UBUS_ATTR_OBJTYPE] && obj->type)
 205                 obj->type->id = 0;
 206
 207         avl_delete(&req->ctx->objects, &obj->avl);
 208 }
 209
 210 int ubus_remove_object(struct ubus_context *ctx, struct ubus_object *obj)
 211 {
 212         struct ubus_request req;
 213         int ret;
 214
 215         blob_buf_init(&b, 0);
 216         blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id);
 217
 218         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_REMOVE_OBJECT, 0) < 0)
 219                 return UBUS_STATUS_INVALID_ARGUMENT;
 220
 221         req.raw_data_cb = ubus_remove_object_cb;
 222         req.priv = obj;
 223         ret = ubus_complete_request(ctx, &req, 0);
 224         if (ret)
 225                 return ret;
 226
 227         if (obj->id)
 228                 return UBUS_STATUS_NO_DATA;
 229
 230         return 0;
 231 }