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         if (fd >= 0)
  35                 close(fd);
  36 }
  37
  38 static void
  39 ubus_process_notify(struct ubus_context *ctx, struct ubus_msghdr *hdr,
  40                     struct ubus_object *obj, struct blob_attr **attrbuf, int fd)
  41 {
  42         if (!obj || !attrbuf[UBUS_ATTR_ACTIVE])
  43                 return;
  44
  45         obj->has_subscribers = blob_get_u8(attrbuf[UBUS_ATTR_ACTIVE]);
  46         if (obj->subscribe_cb)
  47                 obj->subscribe_cb(ctx, obj);
  48
  49         if (fd >= 0)
  50                 close(fd);
  51 }
  52 static void
  53 ubus_process_invoke(struct ubus_context *ctx, struct ubus_msghdr *hdr,
  54                     struct ubus_object *obj, struct blob_attr **attrbuf, int fd)
  55 {
  56         struct ubus_request_data req = {
  57                 .fd = -1,
  58                 .req_fd = fd,
  59         };
  60
  61         int method;
  62         int ret;
  63         bool no_reply = false;
  64
  65         if (!obj) {
  66                 ret = UBUS_STATUS_NOT_FOUND;
  67                 goto send;
  68         }
  69
  70         if (!attrbuf[UBUS_ATTR_METHOD]) {
  71                 ret = UBUS_STATUS_INVALID_ARGUMENT;
  72                 goto send;
  73         }
  74
  75         if (attrbuf[UBUS_ATTR_NO_REPLY])
  76                 no_reply = blob_get_int8(attrbuf[UBUS_ATTR_NO_REPLY]);
  77
  78         req.peer = hdr->peer;
  79         req.seq = hdr->seq;
  80         req.object = obj->id;
  81         if (attrbuf[UBUS_ATTR_USER] && attrbuf[UBUS_ATTR_GROUP]) {
  82                 req.acl.user = blobmsg_get_string(attrbuf[UBUS_ATTR_USER]);
  83                 req.acl.group = blobmsg_get_string(attrbuf[UBUS_ATTR_GROUP]);
  84                 req.acl.object = obj->name;
  85         }
  86         for (method = 0; method < obj->n_methods; method++)
  87                 if (!obj->methods[method].name ||
  88                     !strcmp(obj->methods[method].name,
  89                             blob_data(attrbuf[UBUS_ATTR_METHOD])))
  90                         goto found;
  91
  92         /* not found */
  93         ret = UBUS_STATUS_METHOD_NOT_FOUND;
  94         goto send;
  95
  96 found:
  97         ret = obj->methods[method].handler(ctx, obj, &req,
  98                                            blob_data(attrbuf[UBUS_ATTR_METHOD]),
  99                                            attrbuf[UBUS_ATTR_DATA]);
 100         if (req.req_fd >= 0)
 101                 close(req.req_fd);
 102         if (req.deferred || no_reply)
 103                 return;
 104
 105 send:
 106         ubus_complete_deferred_request(ctx, &req, ret);
 107 }
 108
 109
 110 void __hidden ubus_process_obj_msg(struct ubus_context *ctx, struct ubus_msghdr_buf *buf, int fd)
 111 {
 112         void (*cb)(struct ubus_context *, struct ubus_msghdr *,
 113                    struct ubus_object *, struct blob_attr **, int fd);
 114         struct ubus_msghdr *hdr = &buf->hdr;
 115         struct blob_attr **attrbuf;
 116         struct ubus_object *obj;
 117         uint32_t objid;
 118         void *prev_data = NULL;
 119         attrbuf = ubus_parse_msg(buf->data);
 120         if (!attrbuf[UBUS_ATTR_OBJID])
 121                 return;
 122
 123         objid = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
 124         obj = avl_find_element(&ctx->objects, &objid, obj, avl);
 125
 126         switch (hdr->type) {
 127         case UBUS_MSG_INVOKE:
 128                 cb = ubus_process_invoke;
 129                 break;
 130         case UBUS_MSG_UNSUBSCRIBE:
 131                 cb = ubus_process_unsubscribe;
 132                 break;
 133         case UBUS_MSG_NOTIFY:
 134                 cb = ubus_process_notify;
 135                 break;
 136         default:
 137                 return;
 138         }
 139
 140         if (buf == &ctx->msgbuf) {
 141                 prev_data = buf->data;
 142                 buf->data = NULL;
 143         }
 144
 145         cb(ctx, hdr, obj, attrbuf, fd);
 146
 147         if (prev_data) {
 148                 if (buf->data)
 149                         free(prev_data);
 150                 else
 151                         buf->data = prev_data;
 152         }
 153 }
 154
 155 static void ubus_add_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 156 {
 157         struct ubus_object *obj = req->priv;
 158         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 159
 160         if (!attrbuf[UBUS_ATTR_OBJID])
 161                 return;
 162
 163         obj->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
 164
 165         if (attrbuf[UBUS_ATTR_OBJTYPE])
 166                 obj->type->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJTYPE]);
 167
 168         obj->avl.key = &obj->id;
 169         avl_insert(&req->ctx->objects, &obj->avl);
 170 }
 171
 172 static void ubus_push_method_data(const struct ubus_method *m)
 173 {
 174         void *mtbl;
 175         int i;
 176
 177         mtbl = blobmsg_open_table(&b, m->name);
 178
 179         for (i = 0; i < m->n_policy; i++) {
 180                 if (m->mask && !(m->mask & (1 << i)))
 181                         continue;
 182
 183                 blobmsg_add_u32(&b, m->policy[i].name, m->policy[i].type);
 184         }
 185
 186         blobmsg_close_table(&b, mtbl);
 187 }
 188
 189 static bool ubus_push_object_type(const struct ubus_object_type *type)
 190 {
 191         void *s;
 192         int i;
 193
 194         s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
 195
 196         for (i = 0; i < type->n_methods; i++)
 197                 ubus_push_method_data(&type->methods[i]);
 198
 199         blob_nest_end(&b, s);
 200
 201         return true;
 202 }
 203
 204 int ubus_add_object(struct ubus_context *ctx, struct ubus_object *obj)
 205 {
 206         struct ubus_request req;
 207         int ret;
 208
 209         blob_buf_init(&b, 0);
 210
 211         if (obj->name && obj->type) {
 212                 blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->name);
 213
 214                 if (obj->type->id)
 215                         blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id);
 216                 else if (!ubus_push_object_type(obj->type))
 217                         return UBUS_STATUS_INVALID_ARGUMENT;
 218         }
 219
 220         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_ADD_OBJECT, 0) < 0)
 221                 return UBUS_STATUS_INVALID_ARGUMENT;
 222
 223         req.raw_data_cb = ubus_add_object_cb;
 224         req.priv = obj;
 225         ret = ubus_complete_request(ctx, &req, 0);
 226         if (ret)
 227                 return ret;
 228
 229         if (!obj->id)
 230                 return UBUS_STATUS_NO_DATA;
 231
 232         return 0;
 233 }
 234
 235 static void ubus_remove_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 236 {
 237         struct ubus_object *obj = req->priv;
 238         struct blob_attr **attrbuf = ubus_parse_msg(msg);
 239
 240         if (!attrbuf[UBUS_ATTR_OBJID])
 241                 return;
 242
 243         avl_delete(&req->ctx->objects, &obj->avl);
 244
 245         obj->id = 0;
 246
 247         if (attrbuf[UBUS_ATTR_OBJTYPE] && obj->type)
 248                 obj->type->id = 0;
 249 }
 250
 251 int ubus_remove_object(struct ubus_context *ctx, struct ubus_object *obj)
 252 {
 253         struct ubus_request req;
 254         int ret;
 255
 256         blob_buf_init(&b, 0);
 257         blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id);
 258
 259         if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_REMOVE_OBJECT, 0) < 0)
 260                 return UBUS_STATUS_INVALID_ARGUMENT;
 261
 262         req.raw_data_cb = ubus_remove_object_cb;
 263         req.priv = obj;
 264         ret = ubus_complete_request(ctx, &req, 0);
 265         if (ret)
 266                 return ret;
 267
 268         if (obj->id)
 269                 return UBUS_STATUS_NO_DATA;
 270
 271         return 0;
 272 }