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 *hdr)
  95 {
  96         void (*cb)(struct ubus_context *, struct ubus_msghdr *,
  97                    struct ubus_object *, struct blob_attr **);
  98         struct blob_attr **attrbuf;
  99         struct ubus_object *obj;
 100         uint32_t objid;
 101
 102         attrbuf = ubus_parse_msg(ubus_msghdr_data(hdr));
 103         if (!attrbuf[UBUS_ATTR_OBJID])
 104                 return;
 105
 106         objid = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
 107         obj = avl_find_element(&ctx->objects, &objid, obj, avl);
 108
 109         switch (hdr->type) {
 110         case UBUS_MSG_INVOKE:
 111                 cb = ubus_process_invoke;
 112                 break;
 113         case UBUS_MSG_UNSUBSCRIBE:
 114                 cb = ubus_process_unsubscribe;
 115                 break;
 116         case UBUS_MSG_NOTIFY:
 117                 cb = ubus_process_notify;
 118                 break;
 119         default:
 120                 return;
 121         }
 122         cb(ctx, hdr, obj, attrbuf);
 123 }
 124
 125 static void ubus_add_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 126 {
 127         struct ubus_object *obj = req->priv;
 128         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 129
 130         if (!attrbuf[UBUS_ATTR_OBJID])
 131                 return;
 132
 133         obj->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
 134
 135         if (attrbuf[UBUS_ATTR_OBJTYPE])
 136                 obj->type->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJTYPE]);
 137
 138         obj->avl.key = &obj->id;
 139         avl_insert(&req->ctx->objects, &obj->avl);
 140 }
 141
 142 static void ubus_push_method_data(const struct ubus_method *m)
 143 {
 144         void *mtbl;
 145         int i;
 146
 147         mtbl = blobmsg_open_table(&b, m->name);
 148
 149         for (i = 0; i < m->n_policy; i++)
 150                 blobmsg_add_u32(&b, m->policy[i].name, m->policy[i].type);
 151
 152         blobmsg_close_table(&b, mtbl);
 153 }
 154
 155 static bool ubus_push_object_type(const struct ubus_object_type *type)
 156 {
 157         void *s;
 158         int i;
 159
 160         s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
 161
 162         for (i = 0; i < type->n_methods; i++)
 163                 ubus_push_method_data(&type->methods[i]);
 164
 165         blob_nest_end(&b, s);
 166
 167         return true;
 168 }
 169
 170 int ubus_add_object(struct ubus_context *ctx, struct ubus_object *obj)
 171 {
 172         struct ubus_request req;
 173         int ret;
 174
 175         blob_buf_init(&b, 0);
 176
 177         if (obj->name && obj->type) {
 178                 blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->name);
 179
 180                 if (obj->type->id)
 181                         blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id);
 182                 else if (!ubus_push_object_type(obj->type))
 183                         return UBUS_STATUS_INVALID_ARGUMENT;
 184         }
 185
 186         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_ADD_OBJECT, 0) < 0)
 187                 return UBUS_STATUS_INVALID_ARGUMENT;
 188
 189         req.raw_data_cb = ubus_add_object_cb;
 190         req.priv = obj;
 191         ret = ubus_complete_request(ctx, &req, 0);
 192         if (ret)
 193                 return ret;
 194
 195         if (!obj->id)
 196                 return UBUS_STATUS_NO_DATA;
 197
 198         return 0;
 199 }
 200
 201 static void ubus_remove_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 202 {
 203         struct ubus_object *obj = req->priv;
 204         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 205
 206         if (!attrbuf[UBUS_ATTR_OBJID])
 207                 return;
 208
 209         obj->id = 0;
 210
 211         if (attrbuf[UBUS_ATTR_OBJTYPE] && obj->type)
 212                 obj->type->id = 0;
 213
 214         avl_delete(&req->ctx->objects, &obj->avl);
 215 }
 216
 217 int ubus_remove_object(struct ubus_context *ctx, struct ubus_object *obj)
 218 {
 219         struct ubus_request req;
 220         int ret;
 221
 222         blob_buf_init(&b, 0);
 223         blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id);
 224
 225         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_REMOVE_OBJECT, 0) < 0)
 226                 return UBUS_STATUS_INVALID_ARGUMENT;
 227
 228         req.raw_data_cb = ubus_remove_object_cb;
 229         req.priv = obj;
 230         ret = ubus_complete_request(ctx, &req, 0);
 231         if (ret)
 232                 return ret;
 233
 234         if (obj->id)
 235                 return UBUS_STATUS_NO_DATA;
 236
 237         return 0;
 238 }