ubus.c

   1 /*
   2  * uhttpd - Tiny single-threaded httpd
   3  *
   4  *   Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org>
   5  *   Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #include <libubox/blobmsg.h>
  21 #include <libubox/blobmsg_json.h>
  22 #include <libubox/avl.h>
  23 #include <libubox/avl-cmp.h>
  24 #include <stdio.h>
  25 #include <poll.h>
  26
  27 #include "uhttpd.h"
  28 #include "plugin.h"
  29
  30 static const struct uhttpd_ops *ops;
  31 static struct config *_conf;
  32 #define conf (*_conf)
  33
  34 static struct ubus_context *ctx;
  35 static struct blob_buf buf;
  36
  37 #define UH_UBUS_MAX_POST_SIZE   65536
  38 #define UH_UBUS_DEFAULT_SID     "00000000000000000000000000000000"
  39
  40 enum {
  41         RPC_JSONRPC,
  42         RPC_METHOD,
  43         RPC_PARAMS,
  44         RPC_ID,
  45         __RPC_MAX,
  46 };
  47
  48 static const struct blobmsg_policy rpc_policy[__RPC_MAX] = {
  49         [RPC_JSONRPC] = { .name = "jsonrpc", .type = BLOBMSG_TYPE_STRING },
  50         [RPC_METHOD] = { .name = "method", .type = BLOBMSG_TYPE_STRING },
  51         [RPC_PARAMS] = { .name = "params", .type = BLOBMSG_TYPE_UNSPEC },
  52         [RPC_ID] = { .name = "id", .type = BLOBMSG_TYPE_UNSPEC },
  53 };
  54
  55 enum {
  56         SES_ACCESS,
  57         __SES_MAX,
  58 };
  59
  60 static const struct blobmsg_policy ses_policy[__SES_MAX] = {
  61         [SES_ACCESS] = { .name = "access", .type = BLOBMSG_TYPE_BOOL },
  62 };
  63
  64 struct rpc_data {
  65         struct blob_attr *id;
  66         const char *sid;
  67         const char *method;
  68         const char *object;
  69         const char *function;
  70         struct blob_attr *data;
  71         struct blob_attr *params;
  72 };
  73
  74 struct list_data {
  75         bool verbose;
  76         struct blob_buf *buf;
  77 };
  78
  79 enum rpc_error {
  80         ERROR_PARSE,
  81         ERROR_REQUEST,
  82         ERROR_METHOD,
  83         ERROR_PARAMS,
  84         ERROR_INTERNAL,
  85         ERROR_OBJECT,
  86         ERROR_SESSION,
  87         ERROR_ACCESS,
  88         ERROR_TIMEOUT,
  89         __ERROR_MAX
  90 };
  91
  92 static const struct {
  93         int code;
  94         const char *msg;
  95 } json_errors[__ERROR_MAX] = {
  96         [ERROR_PARSE] = { -32700, "Parse error" },
  97         [ERROR_REQUEST] = { -32600, "Invalid request" },
  98         [ERROR_METHOD] = { -32601, "Method not found" },
  99         [ERROR_PARAMS] = { -32602, "Invalid parameters" },
 100         [ERROR_INTERNAL] = { -32603, "Internal error" },
 101         [ERROR_OBJECT] = { -32000, "Object not found" },
 102         [ERROR_SESSION] = { -32001, "Session not found" },
 103         [ERROR_ACCESS] = { -32002, "Access denied" },
 104         [ERROR_TIMEOUT] = { -32003, "ubus request timed out" },
 105 };
 106
 107 enum cors_hdr {
 108         HDR_ORIGIN,
 109         HDR_ACCESS_CONTROL_REQUEST_METHOD,
 110         HDR_ACCESS_CONTROL_REQUEST_HEADERS,
 111         __HDR_MAX
 112 };
 113
 114 static void __uh_ubus_next_batched_request(struct uloop_timeout *timeout);
 115
 116 static void uh_ubus_next_batched_request(struct client *cl)
 117 {
 118         struct dispatch_ubus *du = &cl->dispatch.ubus;
 119
 120         du->timeout.cb = __uh_ubus_next_batched_request;
 121         uloop_timeout_set(&du->timeout, 1);
 122 }
 123
 124 static void uh_ubus_add_cors_headers(struct client *cl)
 125 {
 126         struct blob_attr *tb[__HDR_MAX];
 127         static const struct blobmsg_policy hdr_policy[__HDR_MAX] = {
 128                 [HDR_ORIGIN] = { "origin", BLOBMSG_TYPE_STRING },
 129                 [HDR_ACCESS_CONTROL_REQUEST_METHOD] = { "access-control-request-method", BLOBMSG_TYPE_STRING },
 130                 [HDR_ACCESS_CONTROL_REQUEST_HEADERS] = { "access-control-request-headers", BLOBMSG_TYPE_STRING },
 131         };
 132
 133         blobmsg_parse(hdr_policy, __HDR_MAX, tb, blob_data(cl->hdr.head), blob_len(cl->hdr.head));
 134
 135         if (!tb[HDR_ORIGIN])
 136                 return;
 137
 138         if (tb[HDR_ACCESS_CONTROL_REQUEST_METHOD])
 139         {
 140                 char *hdr = (char *) blobmsg_data(tb[HDR_ACCESS_CONTROL_REQUEST_METHOD]);
 141
 142                 if (strcmp(hdr, "POST") && strcmp(hdr, "OPTIONS"))
 143                         return;
 144         }
 145
 146         ustream_printf(cl->us, "Access-Control-Allow-Origin: %s\r\n",
 147                        blobmsg_get_string(tb[HDR_ORIGIN]));
 148
 149         if (tb[HDR_ACCESS_CONTROL_REQUEST_HEADERS])
 150                 ustream_printf(cl->us, "Access-Control-Allow-Headers: %s\r\n",
 151                                blobmsg_get_string(tb[HDR_ACCESS_CONTROL_REQUEST_HEADERS]));
 152
 153         ustream_printf(cl->us, "Access-Control-Allow-Methods: POST, OPTIONS\r\n");
 154         ustream_printf(cl->us, "Access-Control-Allow-Credentials: true\r\n");
 155 }
 156
 157 static void uh_ubus_send_header(struct client *cl)
 158 {
 159         ops->http_header(cl, 200, "OK");
 160
 161         if (conf.ubus_cors)
 162                 uh_ubus_add_cors_headers(cl);
 163
 164         ustream_printf(cl->us, "Content-Type: application/json\r\n");
 165
 166         if (cl->request.method == UH_HTTP_MSG_OPTIONS)
 167                 ustream_printf(cl->us, "Content-Length: 0\r\n");
 168
 169         ustream_printf(cl->us, "\r\n");
 170 }
 171
 172 static void uh_ubus_send_response(struct client *cl, struct blob_buf *buf)
 173 {
 174         struct dispatch_ubus *du = &cl->dispatch.ubus;
 175         const char *sep = "";
 176         char *str;
 177
 178         if (du->array && du->array_idx > 1)
 179                 sep = ",";
 180
 181         str = blobmsg_format_json(buf->head, true);
 182         ops->chunk_printf(cl, "%s%s", sep, str);
 183         free(str);
 184
 185         du->jsobj_cur = NULL;
 186         if (du->array)
 187                 uh_ubus_next_batched_request(cl);
 188         else
 189                 return ops->request_done(cl);
 190 }
 191
 192 static void uh_ubus_init_json_rpc_response(struct client *cl, struct blob_buf *buf)
 193 {
 194         struct dispatch_ubus *du = &cl->dispatch.ubus;
 195         struct json_object *obj = du->jsobj_cur, *obj2 = NULL;
 196
 197         blobmsg_add_string(buf, "jsonrpc", "2.0");
 198
 199         if (obj)
 200                 json_object_object_get_ex(obj, "id", &obj2);
 201
 202         if (obj2)
 203                 blobmsg_add_json_element(buf, "id", obj2);
 204         else
 205                 blobmsg_add_field(buf, BLOBMSG_TYPE_UNSPEC, "id", NULL, 0);
 206 }
 207
 208 static void uh_ubus_json_rpc_error(struct client *cl, enum rpc_error type)
 209 {
 210         void *c;
 211
 212         blob_buf_init(&buf, 0);
 213
 214         uh_ubus_init_json_rpc_response(cl, &buf);
 215         c = blobmsg_open_table(&buf, "error");
 216         blobmsg_add_u32(&buf, "code", json_errors[type].code);
 217         blobmsg_add_string(&buf, "message", json_errors[type].msg);
 218         blobmsg_close_table(&buf, c);
 219         uh_ubus_send_response(cl, &buf);
 220 }
 221
 222 static void
 223 uh_ubus_request_data_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 224 {
 225         struct dispatch_ubus *du = container_of(req, struct dispatch_ubus, req);
 226
 227         blobmsg_add_field(&du->buf, BLOBMSG_TYPE_TABLE, "", blob_data(msg), blob_len(msg));
 228 }
 229
 230 static void
 231 uh_ubus_request_cb(struct ubus_request *req, int ret)
 232 {
 233         struct dispatch_ubus *du = container_of(req, struct dispatch_ubus, req);
 234         struct client *cl = container_of(du, struct client, dispatch.ubus);
 235         struct blob_attr *cur;
 236         void *r;
 237         int rem;
 238
 239         blob_buf_init(&buf, 0);
 240
 241         uloop_timeout_cancel(&du->timeout);
 242         uh_ubus_init_json_rpc_response(cl, &buf);
 243         r = blobmsg_open_array(&buf, "result");
 244         blobmsg_add_u32(&buf, "", ret);
 245         blob_for_each_attr(cur, du->buf.head, rem)
 246                 blobmsg_add_blob(&buf, cur);
 247         blobmsg_close_array(&buf, r);
 248         uh_ubus_send_response(cl, &buf);
 249 }
 250
 251 static void
 252 uh_ubus_timeout_cb(struct uloop_timeout *timeout)
 253 {
 254         struct dispatch_ubus *du = container_of(timeout, struct dispatch_ubus, timeout);
 255         struct client *cl = container_of(du, struct client, dispatch.ubus);
 256
 257         ubus_abort_request(ctx, &du->req);
 258         uh_ubus_json_rpc_error(cl, ERROR_TIMEOUT);
 259 }
 260
 261 static void uh_ubus_close_fds(struct client *cl)
 262 {
 263         if (ctx->sock.fd < 0)
 264                 return;
 265
 266         close(ctx->sock.fd);
 267         ctx->sock.fd = -1;
 268 }
 269
 270 static void uh_ubus_request_free(struct client *cl)
 271 {
 272         struct dispatch_ubus *du = &cl->dispatch.ubus;
 273
 274         blob_buf_free(&du->buf);
 275         uloop_timeout_cancel(&du->timeout);
 276
 277         if (du->jsobj)
 278                 json_object_put(du->jsobj);
 279
 280         if (du->jstok)
 281                 json_tokener_free(du->jstok);
 282
 283         if (du->req_pending)
 284                 ubus_abort_request(ctx, &du->req);
 285 }
 286
 287 static void uh_ubus_single_error(struct client *cl, enum rpc_error type)
 288 {
 289         uh_ubus_send_header(cl);
 290         uh_ubus_json_rpc_error(cl, type);
 291         ops->request_done(cl);
 292 }
 293
 294 static void uh_ubus_send_request(struct client *cl, const char *sid, struct blob_attr *args)
 295 {
 296         struct dispatch *d = &cl->dispatch;
 297         struct dispatch_ubus *du = &d->ubus;
 298         struct blob_attr *cur;
 299         static struct blob_buf req;
 300         int ret, rem;
 301
 302         blob_buf_init(&req, 0);
 303         blobmsg_for_each_attr(cur, args, rem) {
 304                 if (!strcmp(blobmsg_name(cur), "ubus_rpc_session"))
 305                         return uh_ubus_json_rpc_error(cl, ERROR_PARAMS);
 306                 blobmsg_add_blob(&req, cur);
 307         }
 308
 309         blobmsg_add_string(&req, "ubus_rpc_session", sid);
 310
 311         blob_buf_init(&du->buf, 0);
 312         memset(&du->req, 0, sizeof(du->req));
 313         ret = ubus_invoke_async(ctx, du->obj, du->func, req.head, &du->req);
 314         if (ret)
 315                 return uh_ubus_json_rpc_error(cl, ERROR_INTERNAL);
 316
 317         du->req.data_cb = uh_ubus_request_data_cb;
 318         du->req.complete_cb = uh_ubus_request_cb;
 319         ubus_complete_request_async(ctx, &du->req);
 320
 321         du->timeout.cb = uh_ubus_timeout_cb;
 322         uloop_timeout_set(&du->timeout, conf.script_timeout * 1000);
 323
 324         du->req_pending = true;
 325 }
 326
 327 static void uh_ubus_list_cb(struct ubus_context *ctx, struct ubus_object_data *obj, void *priv)
 328 {
 329         struct blob_attr *sig, *attr;
 330         struct list_data *data = priv;
 331         int rem, rem2;
 332         void *t, *o;
 333
 334         if (!data->verbose) {
 335                 blobmsg_add_string(data->buf, NULL, obj->path);
 336                 return;
 337         }
 338
 339         if (!obj->signature)
 340                 return;
 341
 342         o = blobmsg_open_table(data->buf, obj->path);
 343         blob_for_each_attr(sig, obj->signature, rem) {
 344                 t = blobmsg_open_table(data->buf, blobmsg_name(sig));
 345                 rem2 = blobmsg_data_len(sig);
 346                 __blob_for_each_attr(attr, blobmsg_data(sig), rem2) {
 347                         if (blob_id(attr) != BLOBMSG_TYPE_INT32)
 348                                 continue;
 349
 350                         switch (blobmsg_get_u32(attr)) {
 351                         case BLOBMSG_TYPE_INT8:
 352                                 blobmsg_add_string(data->buf, blobmsg_name(attr), "boolean");
 353                                 break;
 354                         case BLOBMSG_TYPE_INT32:
 355                                 blobmsg_add_string(data->buf, blobmsg_name(attr), "number");
 356                                 break;
 357                         case BLOBMSG_TYPE_STRING:
 358                                 blobmsg_add_string(data->buf, blobmsg_name(attr), "string");
 359                                 break;
 360                         case BLOBMSG_TYPE_ARRAY:
 361                                 blobmsg_add_string(data->buf, blobmsg_name(attr), "array");
 362                                 break;
 363                         case BLOBMSG_TYPE_TABLE:
 364                                 blobmsg_add_string(data->buf, blobmsg_name(attr), "object");
 365                                 break;
 366                         default:
 367                                 blobmsg_add_string(data->buf, blobmsg_name(attr), "unknown");
 368                                 break;
 369                         }
 370                 }
 371                 blobmsg_close_table(data->buf, t);
 372         }
 373         blobmsg_close_table(data->buf, o);
 374 }
 375
 376 static void uh_ubus_send_list(struct client *cl, struct blob_attr *params)
 377 {
 378         struct blob_attr *cur, *dup;
 379         struct list_data data = { .buf = &cl->dispatch.ubus.buf, .verbose = false };
 380         void *r;
 381         int rem;
 382
 383         blob_buf_init(data.buf, 0);
 384
 385         uh_client_ref(cl);
 386
 387         if (!params || blob_id(params) != BLOBMSG_TYPE_ARRAY) {
 388                 r = blobmsg_open_array(data.buf, "result");
 389                 ubus_lookup(ctx, NULL, uh_ubus_list_cb, &data);
 390                 blobmsg_close_array(data.buf, r);
 391         }
 392         else {
 393                 r = blobmsg_open_table(data.buf, "result");
 394                 dup = blob_memdup(params);
 395                 if (dup)
 396                 {
 397                         rem = blobmsg_data_len(dup);
 398                         data.verbose = true;
 399                         __blob_for_each_attr(cur, blobmsg_data(dup), rem)
 400                                 ubus_lookup(ctx, blobmsg_data(cur), uh_ubus_list_cb, &data);
 401                         free(dup);
 402                 }
 403                 blobmsg_close_table(data.buf, r);
 404         }
 405
 406         uh_client_unref(cl);
 407
 408         blob_buf_init(&buf, 0);
 409         uh_ubus_init_json_rpc_response(cl, &buf);
 410         blobmsg_add_blob(&buf, blob_data(data.buf->head));
 411         uh_ubus_send_response(cl, &buf);
 412 }
 413
 414 static bool parse_json_rpc(struct rpc_data *d, struct blob_attr *data)
 415 {
 416         struct blob_attr *tb[__RPC_MAX];
 417         struct blob_attr *cur;
 418
 419         blobmsg_parse(rpc_policy, __RPC_MAX, tb, blob_data(data), blob_len(data));
 420
 421         cur = tb[RPC_JSONRPC];
 422         if (!cur || strcmp(blobmsg_data(cur), "2.0") != 0)
 423                 return false;
 424
 425         cur = tb[RPC_METHOD];
 426         if (!cur)
 427                 return false;
 428
 429         d->id = tb[RPC_ID];
 430         d->method = blobmsg_data(cur);
 431
 432         cur = tb[RPC_PARAMS];
 433         if (!cur)
 434                 return true;
 435
 436         d->params = blob_memdup(cur);
 437         if (!d->params)
 438                 return false;
 439
 440         return true;
 441 }
 442
 443 static void parse_call_params(struct rpc_data *d)
 444 {
 445         const struct blobmsg_policy data_policy[] = {
 446                 { .type = BLOBMSG_TYPE_STRING },
 447                 { .type = BLOBMSG_TYPE_STRING },
 448                 { .type = BLOBMSG_TYPE_STRING },
 449                 { .type = BLOBMSG_TYPE_TABLE },
 450         };
 451         struct blob_attr *tb[4];
 452
 453         if (!d->params || blobmsg_type(d->params) != BLOBMSG_TYPE_ARRAY)
 454                 return;
 455
 456         blobmsg_parse_array(data_policy, ARRAY_SIZE(data_policy), tb,
 457                             blobmsg_data(d->params), blobmsg_data_len(d->params));
 458
 459         if (tb[0])
 460                 d->sid = blobmsg_data(tb[0]);
 461
 462         if (conf.ubus_noauth && (!d->sid || !*d->sid))
 463                 d->sid = UH_UBUS_DEFAULT_SID;
 464
 465         if (tb[1])
 466                 d->object = blobmsg_data(tb[1]);
 467
 468         if (tb[2])
 469                 d->function = blobmsg_data(tb[2]);
 470
 471         d->data = tb[3];
 472 }
 473
 474 static void uh_ubus_init_batch(struct client *cl)
 475 {
 476         struct dispatch_ubus *du = &cl->dispatch.ubus;
 477
 478         du->array = true;
 479         uh_ubus_send_header(cl);
 480         ops->chunk_printf(cl, "[");
 481 }
 482
 483 static void uh_ubus_complete_batch(struct client *cl)
 484 {
 485         ops->chunk_printf(cl, "]");
 486         ops->request_done(cl);
 487 }
 488
 489 static void uh_ubus_allowed_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 490 {
 491         struct blob_attr *tb[__SES_MAX];
 492         bool *allow = (bool *)req->priv;
 493
 494         if (!msg)
 495                 return;
 496
 497         blobmsg_parse(ses_policy, __SES_MAX, tb, blob_data(msg), blob_len(msg));
 498
 499         if (tb[SES_ACCESS])
 500                 *allow = blobmsg_get_bool(tb[SES_ACCESS]);
 501 }
 502
 503 static bool uh_ubus_allowed(const char *sid, const char *obj, const char *fun)
 504 {
 505         uint32_t id;
 506         bool allow = false;
 507         static struct blob_buf req;
 508
 509         if (ubus_lookup_id(ctx, "session", &id))
 510                 return false;
 511
 512         blob_buf_init(&req, 0);
 513         blobmsg_add_string(&req, "ubus_rpc_session", sid);
 514         blobmsg_add_string(&req, "object", obj);
 515         blobmsg_add_string(&req, "function", fun);
 516
 517         ubus_invoke(ctx, id, "access", req.head, uh_ubus_allowed_cb, &allow, conf.script_timeout * 500);
 518
 519         return allow;
 520 }
 521
 522 static void uh_ubus_handle_request_object(struct client *cl, struct json_object *obj)
 523 {
 524         struct dispatch_ubus *du = &cl->dispatch.ubus;
 525         struct rpc_data data = {};
 526         enum rpc_error err = ERROR_PARSE;
 527         static struct blob_buf req;
 528
 529         uh_client_ref(cl);
 530
 531         if (json_object_get_type(obj) != json_type_object)
 532                 goto error;
 533
 534         du->jsobj_cur = obj;
 535         blob_buf_init(&req, 0);
 536         if (!blobmsg_add_object(&req, obj))
 537                 goto error;
 538
 539         if (!parse_json_rpc(&data, req.head))
 540                 goto error;
 541
 542         if (!strcmp(data.method, "call")) {
 543                 parse_call_params(&data);
 544
 545                 if (!data.sid || !data.object || !data.function || !data.data)
 546                         goto error;
 547
 548                 du->func = data.function;
 549                 if (ubus_lookup_id(ctx, data.object, &du->obj)) {
 550                         err = ERROR_OBJECT;
 551                         goto error;
 552                 }
 553
 554                 if (!conf.ubus_noauth && !uh_ubus_allowed(data.sid, data.object, data.function)) {
 555                         err = ERROR_ACCESS;
 556                         goto error;
 557                 }
 558
 559                 uh_ubus_send_request(cl, data.sid, data.data);
 560                 goto out;
 561         }
 562         else if (!strcmp(data.method, "list")) {
 563                 uh_ubus_send_list(cl, data.params);
 564                 goto out;
 565         }
 566         else {
 567                 err = ERROR_METHOD;
 568                 goto error;
 569         }
 570
 571 error:
 572         uh_ubus_json_rpc_error(cl, err);
 573 out:
 574         if (data.params)
 575                 free(data.params);
 576
 577         uh_client_unref(cl);
 578 }
 579
 580 static void __uh_ubus_next_batched_request(struct uloop_timeout *timeout)
 581 {
 582         struct dispatch_ubus *du = container_of(timeout, struct dispatch_ubus, timeout);
 583         struct client *cl = container_of(du, struct client, dispatch.ubus);
 584         struct json_object *obj = du->jsobj;
 585         int len;
 586
 587         len = json_object_array_length(obj);
 588         if (du->array_idx >= len)
 589                 return uh_ubus_complete_batch(cl);
 590
 591         obj = json_object_array_get_idx(obj, du->array_idx++);
 592         uh_ubus_handle_request_object(cl, obj);
 593 }
 594
 595 static void uh_ubus_data_done(struct client *cl)
 596 {
 597         struct dispatch_ubus *du = &cl->dispatch.ubus;
 598         struct json_object *obj = du->jsobj;
 599
 600         switch (obj ? json_object_get_type(obj) : json_type_null) {
 601         case json_type_object:
 602                 uh_ubus_send_header(cl);
 603                 return uh_ubus_handle_request_object(cl, obj);
 604         case json_type_array:
 605                 uh_ubus_init_batch(cl);
 606                 return uh_ubus_next_batched_request(cl);
 607         default:
 608                 return uh_ubus_single_error(cl, ERROR_PARSE);
 609         }
 610 }
 611
 612 static int uh_ubus_data_send(struct client *cl, const char *data, int len)
 613 {
 614         struct dispatch_ubus *du = &cl->dispatch.ubus;
 615
 616         if (du->jsobj || !du->jstok)
 617                 goto error;
 618
 619         du->post_len += len;
 620         if (du->post_len > UH_UBUS_MAX_POST_SIZE)
 621                 goto error;
 622
 623         du->jsobj = json_tokener_parse_ex(du->jstok, data, len);
 624         return len;
 625
 626 error:
 627         uh_ubus_single_error(cl, ERROR_PARSE);
 628         return 0;
 629 }
 630
 631 static void uh_ubus_handle_request(struct client *cl, char *url, struct path_info *pi)
 632 {
 633         struct dispatch *d = &cl->dispatch;
 634
 635         switch (cl->request.method)
 636         {
 637         case UH_HTTP_MSG_POST:
 638                 d->data_send = uh_ubus_data_send;
 639                 d->data_done = uh_ubus_data_done;
 640                 d->close_fds = uh_ubus_close_fds;
 641                 d->free = uh_ubus_request_free;
 642                 d->ubus.jstok = json_tokener_new();
 643                 break;
 644
 645         case UH_HTTP_MSG_OPTIONS:
 646                 uh_ubus_send_header(cl);
 647                 ops->request_done(cl);
 648                 break;
 649
 650         default:
 651                 ops->client_error(cl, 400, "Bad Request", "Invalid Request");
 652         }
 653 }
 654
 655 static bool
 656 uh_ubus_check_url(const char *url)
 657 {
 658         return ops->path_match(conf.ubus_prefix, url);
 659 }
 660
 661 static int
 662 uh_ubus_init(void)
 663 {
 664         static struct dispatch_handler ubus_dispatch = {
 665                 .check_url = uh_ubus_check_url,
 666                 .handle_request = uh_ubus_handle_request,
 667         };
 668
 669         ctx = ubus_connect(conf.ubus_socket);
 670         if (!ctx) {
 671                 fprintf(stderr, "Unable to connect to ubus socket\n");
 672                 exit(1);
 673         }
 674
 675         ops->dispatch_add(&ubus_dispatch);
 676
 677         uloop_done();
 678         return 0;
 679 }
 680
 681
 682 static int uh_ubus_plugin_init(const struct uhttpd_ops *o, struct config *c)
 683 {
 684         ops = o;
 685         _conf = c;
 686         return uh_ubus_init();
 687 }
 688
 689 static void uh_ubus_post_init(void)
 690 {
 691         ubus_add_uloop(ctx);
 692 }
 693
 694 struct uhttpd_plugin uhttpd_plugin = {
 695         .init = uh_ubus_plugin_init,
 696         .post_init = uh_ubus_post_init,
 697 };