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         if (attrbuf[UBUS_ATTR_USER] && attrbuf[UBUS_ATTR_GROUP]) {
  73                 req.acl.user = blobmsg_get_string(attrbuf[UBUS_ATTR_USER]);
  74                 req.acl.group = blobmsg_get_string(attrbuf[UBUS_ATTR_GROUP]);
  75                 req.acl.object = obj->name;
  76         }
  77         for (method = 0; method < obj->n_methods; method++)
  78                 if (!obj->methods[method].name ||
  79                     !strcmp(obj->methods[method].name,
  80                             blob_data(attrbuf[UBUS_ATTR_METHOD])))
  81                         goto found;
  82
  83         /* not found */
  84         ret = UBUS_STATUS_METHOD_NOT_FOUND;
  85         goto send;
  86
  87 found:
  88         ret = obj->methods[method].handler(ctx, obj, &req,
  89                                            blob_data(attrbuf[UBUS_ATTR_METHOD]),
  90                                            attrbuf[UBUS_ATTR_DATA]);
  91         if (req.deferred || no_reply)
  92                 return;
  93
  94 send:
  95         ubus_complete_deferred_request(ctx, &req, ret);
  96 }
  97
  98 void __hidden ubus_process_obj_msg(struct ubus_context *ctx, struct ubus_msghdr_buf *buf)
  99 {
 100         void (*cb)(struct ubus_context *, struct ubus_msghdr *,
 101                    struct ubus_object *, struct blob_attr **);
 102         struct ubus_msghdr *hdr = &buf->hdr;
 103         struct blob_attr **attrbuf;
 104         struct ubus_object *obj;
 105         uint32_t objid;
 106         void *prev_data = NULL;
 107
 108         attrbuf = ubus_parse_msg(buf->data);
 109         if (!attrbuf[UBUS_ATTR_OBJID])
 110                 return;
 111
 112         objid = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
 113         obj = avl_find_element(&ctx->objects, &objid, obj, avl);
 114
 115         switch (hdr->type) {
 116         case UBUS_MSG_INVOKE:
 117                 cb = ubus_process_invoke;
 118                 break;
 119         case UBUS_MSG_UNSUBSCRIBE:
 120                 cb = ubus_process_unsubscribe;
 121                 break;
 122         case UBUS_MSG_NOTIFY:
 123                 cb = ubus_process_notify;
 124                 break;
 125         default:
 126                 return;
 127         }
 128
 129         if (buf == &ctx->msgbuf) {
 130                 prev_data = buf->data;
 131                 buf->data = NULL;
 132         }
 133
 134         cb(ctx, hdr, obj, attrbuf);
 135
 136         if (prev_data) {
 137                 if (buf->data)
 138                         free(prev_data);
 139                 else
 140                         buf->data = prev_data;
 141         }
 142 }
 143
 144 static void ubus_add_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 145 {
 146         struct ubus_object *obj = req->priv;
 147         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 148
 149         if (!attrbuf[UBUS_ATTR_OBJID])
 150                 return;
 151
 152         obj->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
 153
 154         if (attrbuf[UBUS_ATTR_OBJTYPE])
 155                 obj->type->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJTYPE]);
 156
 157         obj->avl.key = &obj->id;
 158         avl_insert(&req->ctx->objects, &obj->avl);
 159 }
 160
 161 static void ubus_push_method_data(const struct ubus_method *m)
 162 {
 163         void *mtbl;
 164         int i;
 165
 166         mtbl = blobmsg_open_table(&b, m->name);
 167
 168         for (i = 0; i < m->n_policy; i++) {
 169                 if (m->mask && !(m->mask & (1 << i)))
 170                         continue;
 171
 172                 blobmsg_add_u32(&b, m->policy[i].name, m->policy[i].type);
 173         }
 174
 175         blobmsg_close_table(&b, mtbl);
 176 }
 177
 178 static bool ubus_push_object_type(const struct ubus_object_type *type)
 179 {
 180         void *s;
 181         int i;
 182
 183         s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
 184
 185         for (i = 0; i < type->n_methods; i++)
 186                 ubus_push_method_data(&type->methods[i]);
 187
 188         blob_nest_end(&b, s);
 189
 190         return true;
 191 }
 192
 193 int ubus_add_object(struct ubus_context *ctx, struct ubus_object *obj)
 194 {
 195         struct ubus_request req;
 196         int ret;
 197
 198         blob_buf_init(&b, 0);
 199
 200         if (obj->name && obj->type) {
 201                 blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->name);
 202
 203                 if (obj->type->id)
 204                         blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id);
 205                 else if (!ubus_push_object_type(obj->type))
 206                         return UBUS_STATUS_INVALID_ARGUMENT;
 207         }
 208
 209         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_ADD_OBJECT, 0) < 0)
 210                 return UBUS_STATUS_INVALID_ARGUMENT;
 211
 212         req.raw_data_cb = ubus_add_object_cb;
 213         req.priv = obj;
 214         ret = ubus_complete_request(ctx, &req, 0);
 215         if (ret)
 216                 return ret;
 217
 218         if (!obj->id)
 219                 return UBUS_STATUS_NO_DATA;
 220
 221         return 0;
 222 }
 223
 224 static void ubus_remove_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 225 {
 226         struct ubus_object *obj = req->priv;
 227         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 228
 229         if (!attrbuf[UBUS_ATTR_OBJID])
 230                 return;
 231
 232         obj->id = 0;
 233
 234         if (attrbuf[UBUS_ATTR_OBJTYPE] && obj->type)
 235                 obj->type->id = 0;
 236
 237         avl_delete(&req->ctx->objects, &obj->avl);
 238 }
 239
 240 int ubus_remove_object(struct ubus_context *ctx, struct ubus_object *obj)
 241 {
 242         struct ubus_request req;
 243         int ret;
 244
 245         blob_buf_init(&b, 0);
 246         blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id);
 247
 248         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_REMOVE_OBJECT, 0) < 0)
 249                 return UBUS_STATUS_INVALID_ARGUMENT;
 250
 251         req.raw_data_cb = ubus_remove_object_cb;
 252         req.priv = obj;
 253         ret = ubus_complete_request(ctx, &req, 0);
 254         if (ret)
 255                 return ret;
 256
 257         if (obj->id)
 258                 return UBUS_STATUS_NO_DATA;
 259
 260         return 0;
 261 }