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 void __hidden ubus_process_invoke(struct ubus_context *ctx, struct ubus_msghdr *hdr)
  18 {
  19         struct blob_attr **attrbuf;
  20         struct ubus_request_data req;
  21         struct ubus_object *obj;
  22         int method;
  23         int ret = 0;
  24
  25         req.peer = hdr->peer;
  26         req.seq = hdr->seq;
  27         attrbuf = ubus_parse_msg(hdr->data);
  28
  29         if (!attrbuf[UBUS_ATTR_OBJID])
  30                 return;
  31
  32         req.object = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
  33
  34         if (!attrbuf[UBUS_ATTR_METHOD]) {
  35                 ret = UBUS_STATUS_INVALID_ARGUMENT;
  36                 goto send;
  37         }
  38
  39         obj = avl_find_element(&ctx->objects, &req.object, obj, avl);
  40         if (!obj) {
  41                 ret = UBUS_STATUS_NOT_FOUND;
  42                 goto send;
  43         }
  44
  45         for (method = 0; method < obj->n_methods; method++)
  46                 if (!obj->methods[method].name ||
  47                     !strcmp(obj->methods[method].name,
  48                             blob_data(attrbuf[UBUS_ATTR_METHOD])))
  49                         goto found;
  50
  51         /* not found */
  52         ret = UBUS_STATUS_METHOD_NOT_FOUND;
  53         goto send;
  54
  55 found:
  56         ret = obj->methods[method].handler(ctx, obj, &req,
  57                                            blob_data(attrbuf[UBUS_ATTR_METHOD]),
  58                                            attrbuf[UBUS_ATTR_DATA]);
  59         if (req.deferred)
  60                 return;
  61
  62 send:
  63         ubus_complete_deferred_request(ctx, &req, ret);
  64 }
  65
  66 static void ubus_add_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
  67 {
  68         struct ubus_object *obj = req->priv;
  69         struct blob_attr **attrbuf = ubus_parse_msg(msg);
  70
  71         if (!attrbuf[UBUS_ATTR_OBJID])
  72                 return;
  73
  74         obj->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
  75
  76         if (attrbuf[UBUS_ATTR_OBJTYPE])
  77                 obj->type->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJTYPE]);
  78
  79         obj->avl.key = &obj->id;
  80         avl_insert(&req->ctx->objects, &obj->avl);
  81 }
  82
  83 static void ubus_push_method_data(const struct ubus_method *m)
  84 {
  85         void *mtbl;
  86         int i;
  87
  88         mtbl = blobmsg_open_table(&b, m->name);
  89
  90         for (i = 0; i < m->n_policy; i++)
  91                 blobmsg_add_u32(&b, m->policy[i].name, m->policy[i].type);
  92
  93         blobmsg_close_table(&b, mtbl);
  94 }
  95
  96 static bool ubus_push_object_type(const struct ubus_object_type *type)
  97 {
  98         void *s;
  99         int i;
 100
 101         s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
 102
 103         for (i = 0; i < type->n_methods; i++)
 104                 ubus_push_method_data(&type->methods[i]);
 105
 106         blob_nest_end(&b, s);
 107
 108         return true;
 109 }
 110
 111 int ubus_add_object(struct ubus_context *ctx, struct ubus_object *obj)
 112 {
 113         struct ubus_request req;
 114         int ret;
 115
 116         blob_buf_init(&b, 0);
 117
 118         if (obj->name && obj->type) {
 119                 blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->name);
 120
 121                 if (obj->type->id)
 122                         blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id);
 123                 else if (!ubus_push_object_type(obj->type))
 124                         return UBUS_STATUS_INVALID_ARGUMENT;
 125         }
 126
 127         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_ADD_OBJECT, 0) < 0)
 128                 return UBUS_STATUS_INVALID_ARGUMENT;
 129
 130         req.raw_data_cb = ubus_add_object_cb;
 131         req.priv = obj;
 132         ret = ubus_complete_request(ctx, &req, 0);
 133         if (ret)
 134                 return ret;
 135
 136         if (!obj->id)
 137                 return UBUS_STATUS_NO_DATA;
 138
 139         return 0;
 140 }
 141
 142 static void ubus_remove_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 143 {
 144         struct ubus_object *obj = req->priv;
 145         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 146
 147         if (!attrbuf[UBUS_ATTR_OBJID])
 148                 return;
 149
 150         obj->id = 0;
 151
 152         if (attrbuf[UBUS_ATTR_OBJTYPE] && obj->type)
 153                 obj->type->id = 0;
 154
 155         avl_delete(&req->ctx->objects, &obj->avl);
 156 }
 157
 158 int ubus_remove_object(struct ubus_context *ctx, struct ubus_object *obj)
 159 {
 160         struct ubus_request req;
 161         int ret;
 162
 163         blob_buf_init(&b, 0);
 164         blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id);
 165
 166         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_REMOVE_OBJECT, 0) < 0)
 167                 return UBUS_STATUS_INVALID_ARGUMENT;
 168
 169         req.raw_data_cb = ubus_remove_object_cb;
 170         req.priv = obj;
 171         ret = ubus_complete_request(ctx, &req, 0);
 172         if (ret)
 173                 return ret;
 174
 175         if (obj->id)
 176                 return UBUS_STATUS_NO_DATA;
 177
 178         return 0;
 179 }