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