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         if (s->remove_cb)
  31                 s->remove_cb(ctx, s, blob_get_u32(attrbuf[UBUS_ATTR_TARGET]));
  32 }
  33
  34 static void
  35 ubus_process_notify(struct ubus_context *ctx, struct ubus_msghdr *hdr,
  36                     struct ubus_object *obj, struct blob_attr **attrbuf)
  37 {
  38         if (!obj || !attrbuf[UBUS_ATTR_ACTIVE])
  39                 return;
  40
  41         obj->has_subscribers = blob_get_u8(attrbuf[UBUS_ATTR_ACTIVE]);
  42         if (obj->subscribe_cb)
  43                 obj->subscribe_cb(ctx, obj);
  44 }
  45 static void
  46 ubus_process_invoke(struct ubus_context *ctx, struct ubus_msghdr *hdr,
  47                     struct ubus_object *obj, struct blob_attr **attrbuf)
  48 {
  49         struct ubus_request_data req = {
  50                 .fd = -1,
  51         };
  52         int method;
  53         int ret;
  54         bool no_reply = false;
  55
  56         if (!obj) {
  57                 ret = UBUS_STATUS_NOT_FOUND;
  58                 goto send;
  59         }
  60
  61         if (!attrbuf[UBUS_ATTR_METHOD]) {
  62                 ret = UBUS_STATUS_INVALID_ARGUMENT;
  63                 goto send;
  64         }
  65
  66         if (attrbuf[UBUS_ATTR_NO_REPLY])
  67                 no_reply = blob_get_int8(attrbuf[UBUS_ATTR_NO_REPLY]);
  68
  69         req.peer = hdr->peer;
  70         req.seq = hdr->seq;
  71         req.object = obj->id;
  72
  73         for (method = 0; method < obj->n_methods; method++)
  74                 if (!obj->methods[method].name ||
  75                     !strcmp(obj->methods[method].name,
  76                             blob_data(attrbuf[UBUS_ATTR_METHOD])))
  77                         goto found;
  78
  79         /* not found */
  80         ret = UBUS_STATUS_METHOD_NOT_FOUND;
  81         goto send;
  82
  83 found:
  84         ret = obj->methods[method].handler(ctx, obj, &req,
  85                                            blob_data(attrbuf[UBUS_ATTR_METHOD]),
  86                                            attrbuf[UBUS_ATTR_DATA]);
  87         if (req.deferred || no_reply)
  88                 return;
  89
  90 send:
  91         ubus_complete_deferred_request(ctx, &req, ret);
  92 }
  93
  94 void __hidden ubus_process_obj_msg(struct ubus_context *ctx, struct ubus_msghdr_buf *buf)
  95 {
  96         void (*cb)(struct ubus_context *, struct ubus_msghdr *,
  97                    struct ubus_object *, struct blob_attr **);
  98         struct ubus_msghdr *hdr = &buf->hdr;
  99         struct blob_attr **attrbuf;
 100         struct ubus_object *obj;
 101         uint32_t objid;
 102         void *prev_data = NULL;
 103
 104         attrbuf = ubus_parse_msg(buf->data);
 105         if (!attrbuf[UBUS_ATTR_OBJID])
 106                 return;
 107
 108         objid = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
 109         obj = avl_find_element(&ctx->objects, &objid, obj, avl);
 110
 111         switch (hdr->type) {
 112         case UBUS_MSG_INVOKE:
 113                 cb = ubus_process_invoke;
 114                 break;
 115         case UBUS_MSG_UNSUBSCRIBE:
 116                 cb = ubus_process_unsubscribe;
 117                 break;
 118         case UBUS_MSG_NOTIFY:
 119                 cb = ubus_process_notify;
 120                 break;
 121         default:
 122                 return;
 123         }
 124
 125         if (buf == &ctx->msgbuf) {
 126                 prev_data = buf->data;
 127                 buf->data = NULL;
 128         }
 129
 130         cb(ctx, hdr, obj, attrbuf);
 131
 132         if (prev_data) {
 133                 if (buf->data)
 134                         free(prev_data);
 135                 else
 136                         buf->data = prev_data;
 137         }
 138 }
 139
 140 static void ubus_add_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 141 {
 142         struct ubus_object *obj = req->priv;
 143         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 144
 145         if (!attrbuf[UBUS_ATTR_OBJID])
 146                 return;
 147
 148         obj->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
 149
 150         if (attrbuf[UBUS_ATTR_OBJTYPE])
 151                 obj->type->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJTYPE]);
 152
 153         obj->avl.key = &obj->id;
 154         avl_insert(&req->ctx->objects, &obj->avl);
 155 }
 156
 157 static void ubus_push_method_data(const struct ubus_method *m)
 158 {
 159         void *mtbl;
 160         int i;
 161
 162         mtbl = blobmsg_open_table(&b, m->name);
 163
 164         for (i = 0; i < m->n_policy; i++) {
 165                 if (m->mask && !(m->mask & (1 << i)))
 166                         continue;
 167
 168                 blobmsg_add_u32(&b, m->policy[i].name, m->policy[i].type);
 169         }
 170
 171         blobmsg_close_table(&b, mtbl);
 172 }
 173
 174 static bool ubus_push_object_type(const struct ubus_object_type *type)
 175 {
 176         void *s;
 177         int i;
 178
 179         s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
 180
 181         for (i = 0; i < type->n_methods; i++)
 182                 ubus_push_method_data(&type->methods[i]);
 183
 184         blob_nest_end(&b, s);
 185
 186         return true;
 187 }
 188
 189 int ubus_add_object(struct ubus_context *ctx, struct ubus_object *obj)
 190 {
 191         struct ubus_request req;
 192         int ret;
 193
 194         blob_buf_init(&b, 0);
 195
 196         if (obj->name && obj->type) {
 197                 blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->name);
 198
 199                 if (obj->type->id)
 200                         blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id);
 201                 else if (!ubus_push_object_type(obj->type))
 202                         return UBUS_STATUS_INVALID_ARGUMENT;
 203         }
 204
 205         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_ADD_OBJECT, 0) < 0)
 206                 return UBUS_STATUS_INVALID_ARGUMENT;
 207
 208         req.raw_data_cb = ubus_add_object_cb;
 209         req.priv = obj;
 210         ret = ubus_complete_request(ctx, &req, 0);
 211         if (ret)
 212                 return ret;
 213
 214         if (!obj->id)
 215                 return UBUS_STATUS_NO_DATA;
 216
 217         return 0;
 218 }
 219
 220 static void ubus_remove_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 221 {
 222         struct ubus_object *obj = req->priv;
 223         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 224
 225         if (!attrbuf[UBUS_ATTR_OBJID])
 226                 return;
 227
 228         obj->id = 0;
 229
 230         if (attrbuf[UBUS_ATTR_OBJTYPE] && obj->type)
 231                 obj->type->id = 0;
 232
 233         avl_delete(&req->ctx->objects, &obj->avl);
 234 }
 235
 236 int ubus_remove_object(struct ubus_context *ctx, struct ubus_object *obj)
 237 {
 238         struct ubus_request req;
 239         int ret;
 240
 241         blob_buf_init(&b, 0);
 242         blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id);
 243
 244         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_REMOVE_OBJECT, 0) < 0)
 245                 return UBUS_STATUS_INVALID_ARGUMENT;
 246
 247         req.raw_data_cb = ubus_remove_object_cb;
 248         req.priv = obj;
 249         ret = ubus_complete_request(ctx, &req, 0);
 250         if (ret)
 251                 return ret;
 252
 253         if (obj->id)
 254                 return UBUS_STATUS_NO_DATA;
 255
 256         return 0;
 257 }