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 <unistd.h>
  15 #include "libubus.h"
  16 #include "libubus-internal.h"
  17
  18 static void
  19 ubus_process_unsubscribe(struct ubus_context *ctx, struct ubus_msghdr *hdr,
  20                          struct ubus_object *obj, struct blob_attr **attrbuf, int fd)
  21 {
  22         struct ubus_subscriber *s;
  23
  24         if (!obj || !attrbuf[UBUS_ATTR_TARGET])
  25                 return;
  26
  27         if (obj->methods != &watch_method)
  28                 return;
  29
  30         s = container_of(obj, struct ubus_subscriber, obj);
  31         if (s->remove_cb)
  32                 s->remove_cb(ctx, s, blob_get_u32(attrbuf[UBUS_ATTR_TARGET]));
  33
  34         close(fd);
  35 }
  36
  37 static void
  38 ubus_process_notify(struct ubus_context *ctx, struct ubus_msghdr *hdr,
  39                     struct ubus_object *obj, struct blob_attr **attrbuf, int fd)
  40 {
  41         if (!obj || !attrbuf[UBUS_ATTR_ACTIVE])
  42                 return;
  43
  44         obj->has_subscribers = blob_get_u8(attrbuf[UBUS_ATTR_ACTIVE]);
  45         if (obj->subscribe_cb)
  46                 obj->subscribe_cb(ctx, obj);
  47
  48         close(fd);
  49 }
  50 static void
  51 ubus_process_invoke(struct ubus_context *ctx, struct ubus_msghdr *hdr,
  52                     struct ubus_object *obj, struct blob_attr **attrbuf, int fd)
  53 {
  54         struct ubus_request_data req = {
  55                 .fd = -1,
  56                 .req_fd = fd,
  57         };
  58
  59         int method;
  60         int ret;
  61         bool no_reply = false;
  62
  63         if (!obj) {
  64                 ret = UBUS_STATUS_NOT_FOUND;
  65                 goto send;
  66         }
  67
  68         if (!attrbuf[UBUS_ATTR_METHOD]) {
  69                 ret = UBUS_STATUS_INVALID_ARGUMENT;
  70                 goto send;
  71         }
  72
  73         if (attrbuf[UBUS_ATTR_NO_REPLY])
  74                 no_reply = blob_get_int8(attrbuf[UBUS_ATTR_NO_REPLY]);
  75
  76         req.peer = hdr->peer;
  77         req.seq = hdr->seq;
  78         req.object = obj->id;
  79         if (attrbuf[UBUS_ATTR_USER] && attrbuf[UBUS_ATTR_GROUP]) {
  80                 req.acl.user = blobmsg_get_string(attrbuf[UBUS_ATTR_USER]);
  81                 req.acl.group = blobmsg_get_string(attrbuf[UBUS_ATTR_GROUP]);
  82                 req.acl.object = obj->name;
  83         }
  84         for (method = 0; method < obj->n_methods; method++)
  85                 if (!obj->methods[method].name ||
  86                     !strcmp(obj->methods[method].name,
  87                             blob_data(attrbuf[UBUS_ATTR_METHOD])))
  88                         goto found;
  89
  90         /* not found */
  91         ret = UBUS_STATUS_METHOD_NOT_FOUND;
  92         goto send;
  93
  94 found:
  95         ret = obj->methods[method].handler(ctx, obj, &req,
  96                                            blob_data(attrbuf[UBUS_ATTR_METHOD]),
  97                                            attrbuf[UBUS_ATTR_DATA]);
  98         close(req.req_fd);
  99         if (req.deferred || no_reply)
 100                 return;
 101
 102 send:
 103         ubus_complete_deferred_request(ctx, &req, ret);
 104 }
 105
 106
 107 void __hidden ubus_process_obj_msg(struct ubus_context *ctx, struct ubus_msghdr_buf *buf, int fd)
 108 {
 109         void (*cb)(struct ubus_context *, struct ubus_msghdr *,
 110                    struct ubus_object *, struct blob_attr **, int fd);
 111         struct ubus_msghdr *hdr = &buf->hdr;
 112         struct blob_attr **attrbuf;
 113         struct ubus_object *obj;
 114         uint32_t objid;
 115         void *prev_data = NULL;
 116         attrbuf = ubus_parse_msg(buf->data);
 117         if (!attrbuf[UBUS_ATTR_OBJID])
 118                 return;
 119
 120         objid = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
 121         obj = avl_find_element(&ctx->objects, &objid, obj, avl);
 122
 123         switch (hdr->type) {
 124         case UBUS_MSG_INVOKE:
 125                 cb = ubus_process_invoke;
 126                 break;
 127         case UBUS_MSG_UNSUBSCRIBE:
 128                 cb = ubus_process_unsubscribe;
 129                 break;
 130         case UBUS_MSG_NOTIFY:
 131                 cb = ubus_process_notify;
 132                 break;
 133         default:
 134                 return;
 135         }
 136
 137         if (buf == &ctx->msgbuf) {
 138                 prev_data = buf->data;
 139                 buf->data = NULL;
 140         }
 141
 142         cb(ctx, hdr, obj, attrbuf, fd);
 143
 144         if (prev_data) {
 145                 if (buf->data)
 146                         free(prev_data);
 147                 else
 148                         buf->data = prev_data;
 149         }
 150 }
 151
 152 static void ubus_add_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 153 {
 154         struct ubus_object *obj = req->priv;
 155         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 156
 157         if (!attrbuf[UBUS_ATTR_OBJID])
 158                 return;
 159
 160         obj->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
 161
 162         if (attrbuf[UBUS_ATTR_OBJTYPE])
 163                 obj->type->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJTYPE]);
 164
 165         obj->avl.key = &obj->id;
 166         avl_insert(&req->ctx->objects, &obj->avl);
 167 }
 168
 169 static void ubus_push_method_data(const struct ubus_method *m)
 170 {
 171         void *mtbl;
 172         int i;
 173
 174         mtbl = blobmsg_open_table(&b, m->name);
 175
 176         for (i = 0; i < m->n_policy; i++) {
 177                 if (m->mask && !(m->mask & (1 << i)))
 178                         continue;
 179
 180                 blobmsg_add_u32(&b, m->policy[i].name, m->policy[i].type);
 181         }
 182
 183         blobmsg_close_table(&b, mtbl);
 184 }
 185
 186 static bool ubus_push_object_type(const struct ubus_object_type *type)
 187 {
 188         void *s;
 189         int i;
 190
 191         s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
 192
 193         for (i = 0; i < type->n_methods; i++)
 194                 ubus_push_method_data(&type->methods[i]);
 195
 196         blob_nest_end(&b, s);
 197
 198         return true;
 199 }
 200
 201 int ubus_add_object(struct ubus_context *ctx, struct ubus_object *obj)
 202 {
 203         struct ubus_request req;
 204         int ret;
 205
 206         blob_buf_init(&b, 0);
 207
 208         if (obj->name && obj->type) {
 209                 blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->name);
 210
 211                 if (obj->type->id)
 212                         blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id);
 213                 else if (!ubus_push_object_type(obj->type))
 214                         return UBUS_STATUS_INVALID_ARGUMENT;
 215         }
 216
 217         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_ADD_OBJECT, 0) < 0)
 218                 return UBUS_STATUS_INVALID_ARGUMENT;
 219
 220         req.raw_data_cb = ubus_add_object_cb;
 221         req.priv = obj;
 222         ret = ubus_complete_request(ctx, &req, 0);
 223         if (ret)
 224                 return ret;
 225
 226         if (!obj->id)
 227                 return UBUS_STATUS_NO_DATA;
 228
 229         return 0;
 230 }
 231
 232 static void ubus_remove_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 233 {
 234         struct ubus_object *obj = req->priv;
 235         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 236
 237         if (!attrbuf[UBUS_ATTR_OBJID])
 238                 return;
 239
 240         obj->id = 0;
 241
 242         if (attrbuf[UBUS_ATTR_OBJTYPE] && obj->type)
 243                 obj->type->id = 0;
 244
 245         avl_delete(&req->ctx->objects, &obj->avl);
 246 }
 247
 248 int ubus_remove_object(struct ubus_context *ctx, struct ubus_object *obj)
 249 {
 250         struct ubus_request req;
 251         int ret;
 252
 253         blob_buf_init(&b, 0);
 254         blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id);
 255
 256         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_REMOVE_OBJECT, 0) < 0)
 257                 return UBUS_STATUS_INVALID_ARGUMENT;
 258
 259         req.raw_data_cb = ubus_remove_object_cb;
 260         req.priv = obj;
 261         ret = ubus_complete_request(ctx, &req, 0);
 262         if (ret)
 263                 return ret;
 264
 265         if (obj->id)
 266                 return UBUS_STATUS_NO_DATA;
 267
 268         return 0;
 269 }