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         bool add_object;
  77         struct blob_buf *buf;
  78 };
  79
  80 enum rpc_error {
  81         ERROR_PARSE,
  82         ERROR_REQUEST,
  83         ERROR_METHOD,
  84         ERROR_PARAMS,
  85         ERROR_INTERNAL,
  86         ERROR_OBJECT,
  87         ERROR_SESSION,
  88         ERROR_ACCESS,
  89         ERROR_TIMEOUT,
  90         __ERROR_MAX
  91 };
  92
  93 static const struct {
  94         int code;
  95         const char *msg;
  96 } json_errors[__ERROR_MAX] = {
  97         [ERROR_PARSE] = { -32700, "Parse error" },
  98         [ERROR_REQUEST] = { -32600, "Invalid request" },
  99         [ERROR_METHOD] = { -32601, "Method not found" },
 100         [ERROR_PARAMS] = { -32602, "Invalid parameters" },
 101         [ERROR_INTERNAL] = { -32603, "Internal error" },
 102         [ERROR_OBJECT] = { -32000, "Object not found" },
 103         [ERROR_SESSION] = { -32001, "Session not found" },
 104         [ERROR_ACCESS] = { -32002, "Access denied" },
 105         [ERROR_TIMEOUT] = { -32003, "ubus request timed out" },
 106 };
 107
 108 enum cors_hdr {
 109         HDR_ORIGIN,
 110         HDR_ACCESS_CONTROL_REQUEST_METHOD,
 111         HDR_ACCESS_CONTROL_REQUEST_HEADERS,
 112         __HDR_MAX
 113 };
 114
 115 enum ubus_hdr {
 116         HDR_AUTHORIZATION,
 117         __HDR_UBUS_MAX
 118 };
 119
 120 static const char *uh_ubus_get_auth(const struct blob_attr *attr)
 121 {
 122         static const struct blobmsg_policy hdr_policy[__HDR_UBUS_MAX] = {
 123                 [HDR_AUTHORIZATION] = { "authorization", BLOBMSG_TYPE_STRING },
 124         };
 125         struct blob_attr *tb[__HDR_UBUS_MAX];
 126
 127         blobmsg_parse(hdr_policy, __HDR_UBUS_MAX, tb, blob_data(attr), blob_len(attr));
 128
 129         if (tb[HDR_AUTHORIZATION]) {
 130                 const char *tmp = blobmsg_get_string(tb[HDR_AUTHORIZATION]);
 131
 132                 if (!strncasecmp(tmp, "Bearer ", 7))
 133                         return tmp + 7;
 134         }
 135
 136         return UH_UBUS_DEFAULT_SID;
 137 }
 138
 139 static void __uh_ubus_next_batched_request(struct uloop_timeout *timeout);
 140
 141 static void uh_ubus_next_batched_request(struct client *cl)
 142 {
 143         struct dispatch_ubus *du = &cl->dispatch.ubus;
 144
 145         du->timeout.cb = __uh_ubus_next_batched_request;
 146         uloop_timeout_set(&du->timeout, 1);
 147 }
 148
 149 static void uh_ubus_add_cors_headers(struct client *cl)
 150 {
 151         struct blob_attr *tb[__HDR_MAX];
 152         static const struct blobmsg_policy hdr_policy[__HDR_MAX] = {
 153                 [HDR_ORIGIN] = { "origin", BLOBMSG_TYPE_STRING },
 154                 [HDR_ACCESS_CONTROL_REQUEST_METHOD] = { "access-control-request-method", BLOBMSG_TYPE_STRING },
 155                 [HDR_ACCESS_CONTROL_REQUEST_HEADERS] = { "access-control-request-headers", BLOBMSG_TYPE_STRING },
 156         };
 157
 158         blobmsg_parse(hdr_policy, __HDR_MAX, tb, blob_data(cl->hdr.head), blob_len(cl->hdr.head));
 159
 160         if (!tb[HDR_ORIGIN])
 161                 return;
 162
 163         if (tb[HDR_ACCESS_CONTROL_REQUEST_METHOD])
 164         {
 165                 char *hdr = (char *) blobmsg_data(tb[HDR_ACCESS_CONTROL_REQUEST_METHOD]);
 166
 167                 if (strcmp(hdr, "GET") && strcmp(hdr, "POST") && strcmp(hdr, "OPTIONS"))
 168                         return;
 169         }
 170
 171         ustream_printf(cl->us, "Access-Control-Allow-Origin: %s\r\n",
 172                        blobmsg_get_string(tb[HDR_ORIGIN]));
 173
 174         if (tb[HDR_ACCESS_CONTROL_REQUEST_HEADERS])
 175                 ustream_printf(cl->us, "Access-Control-Allow-Headers: %s\r\n",
 176                                blobmsg_get_string(tb[HDR_ACCESS_CONTROL_REQUEST_HEADERS]));
 177
 178         ustream_printf(cl->us, "Access-Control-Allow-Methods: GET, POST, OPTIONS\r\n");
 179         ustream_printf(cl->us, "Access-Control-Allow-Credentials: true\r\n");
 180 }
 181
 182 static void uh_ubus_send_header(struct client *cl, int code, const char *summary, const char *content_type)
 183 {
 184         ops->http_header(cl, code, summary);
 185
 186         if (conf.ubus_cors)
 187                 uh_ubus_add_cors_headers(cl);
 188
 189         ustream_printf(cl->us, "Content-Type: %s\r\n", content_type);
 190
 191         if (cl->request.method == UH_HTTP_MSG_OPTIONS)
 192                 ustream_printf(cl->us, "Content-Length: 0\r\n");
 193
 194         ustream_printf(cl->us, "\r\n");
 195 }
 196
 197 static void uh_ubus_send_response(struct client *cl, struct blob_buf *buf)
 198 {
 199         struct dispatch_ubus *du = &cl->dispatch.ubus;
 200         const char *sep = "";
 201         char *str;
 202
 203         if (du->array && du->array_idx > 1)
 204                 sep = ",";
 205
 206         str = blobmsg_format_json(buf->head, true);
 207         ops->chunk_printf(cl, "%s%s", sep, str);
 208         free(str);
 209
 210         du->jsobj_cur = NULL;
 211         if (du->array)
 212                 uh_ubus_next_batched_request(cl);
 213         else
 214                 return ops->request_done(cl);
 215 }
 216
 217 static void uh_ubus_init_json_rpc_response(struct client *cl, struct blob_buf *buf)
 218 {
 219         struct dispatch_ubus *du = &cl->dispatch.ubus;
 220         struct json_object *obj = du->jsobj_cur, *obj2 = NULL;
 221
 222         blobmsg_add_string(buf, "jsonrpc", "2.0");
 223
 224         if (obj)
 225                 json_object_object_get_ex(obj, "id", &obj2);
 226
 227         if (obj2)
 228                 blobmsg_add_json_element(buf, "id", obj2);
 229         else
 230                 blobmsg_add_field(buf, BLOBMSG_TYPE_UNSPEC, "id", NULL, 0);
 231 }
 232
 233 static void uh_ubus_json_rpc_error(struct client *cl, enum rpc_error type)
 234 {
 235         void *c;
 236
 237         blob_buf_init(&buf, 0);
 238
 239         uh_ubus_init_json_rpc_response(cl, &buf);
 240         c = blobmsg_open_table(&buf, "error");
 241         blobmsg_add_u32(&buf, "code", json_errors[type].code);
 242         blobmsg_add_string(&buf, "message", json_errors[type].msg);
 243         blobmsg_close_table(&buf, c);
 244         uh_ubus_send_response(cl, &buf);
 245 }
 246
 247 static void uh_ubus_error(struct client *cl, int code, const char *message)
 248 {
 249         blob_buf_init(&buf, 0);
 250
 251         blobmsg_add_u32(&buf, "code", code);
 252         blobmsg_add_string(&buf, "message", message);
 253         uh_ubus_send_response(cl, &buf);
 254 }
 255
 256 static void uh_ubus_posix_error(struct client *cl, int err)
 257 {
 258         uh_ubus_error(cl, -err, strerror(err));
 259 }
 260
 261 static void uh_ubus_ubus_error(struct client *cl, int err)
 262 {
 263         uh_ubus_error(cl, err, ubus_strerror(err));
 264 }
 265
 266 static void uh_ubus_allowed_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 267 {
 268         struct blob_attr *tb[__SES_MAX];
 269         bool *allow = (bool *)req->priv;
 270
 271         if (!msg)
 272                 return;
 273
 274         blobmsg_parse(ses_policy, __SES_MAX, tb, blob_data(msg), blob_len(msg));
 275
 276         if (tb[SES_ACCESS])
 277                 *allow = blobmsg_get_bool(tb[SES_ACCESS]);
 278 }
 279
 280 static bool uh_ubus_allowed(const char *sid, const char *obj, const char *fun)
 281 {
 282         uint32_t id;
 283         bool allow = false;
 284         static struct blob_buf req;
 285
 286         if (ubus_lookup_id(ctx, "session", &id))
 287                 return false;
 288
 289         blob_buf_init(&req, 0);
 290         blobmsg_add_string(&req, "ubus_rpc_session", sid);
 291         blobmsg_add_string(&req, "object", obj);
 292         blobmsg_add_string(&req, "function", fun);
 293
 294         ubus_invoke(ctx, id, "access", req.head, uh_ubus_allowed_cb, &allow, conf.script_timeout * 500);
 295
 296         return allow;
 297 }
 298
 299 /* GET requests handling */
 300
 301 static void uh_ubus_list_cb(struct ubus_context *ctx, struct ubus_object_data *obj, void *priv);
 302
 303 static void uh_ubus_handle_get_list(struct client *cl, const char *path)
 304 {
 305         static struct blob_buf tmp;
 306         struct list_data data = { .verbose = true, .add_object = !path, .buf = &tmp};
 307         struct blob_attr *cur;
 308         int rem;
 309         int err;
 310
 311         blob_buf_init(&tmp, 0);
 312
 313         err = ubus_lookup(ctx, path, uh_ubus_list_cb, &data);
 314         if (err) {
 315                 uh_ubus_send_header(cl, 500, "Ubus Protocol Error", "application/json");
 316                 uh_ubus_ubus_error(cl, err);
 317                 return;
 318         }
 319
 320         blob_buf_init(&buf, 0);
 321         blob_for_each_attr(cur, tmp.head, rem)
 322                 blobmsg_add_blob(&buf, cur);
 323
 324         uh_ubus_send_header(cl, 200, "OK", "application/json");
 325         uh_ubus_send_response(cl, &buf);
 326 }
 327
 328 static int uh_ubus_subscription_notification_cb(struct ubus_context *ctx,
 329                                                 struct ubus_object *obj,
 330                                                 struct ubus_request_data *req,
 331                                                 const char *method,
 332                                                 struct blob_attr *msg)
 333 {
 334         struct ubus_subscriber *s;
 335         struct dispatch_ubus *du;
 336         struct client *cl;
 337         char *json;
 338
 339         s = container_of(obj, struct ubus_subscriber, obj);
 340         du = container_of(s, struct dispatch_ubus, sub);
 341         cl = container_of(du, struct client, dispatch.ubus);
 342
 343         json = blobmsg_format_json(msg, true);
 344         if (json) {
 345                 ops->chunk_printf(cl, "event: %s\ndata: %s\n\n", method, json);
 346                 free(json);
 347         }
 348
 349         return 0;
 350 }
 351
 352 static void uh_ubus_subscription_notification_remove_cb(struct ubus_context *ctx, struct ubus_subscriber *s, uint32_t id)
 353 {
 354         struct dispatch_ubus *du;
 355         struct client *cl;
 356
 357         du = container_of(s, struct dispatch_ubus, sub);
 358         cl = container_of(du, struct client, dispatch.ubus);
 359
 360         ops->request_done(cl);
 361 }
 362
 363 static void uh_ubus_handle_get_subscribe(struct client *cl, const char *path)
 364 {
 365         struct dispatch_ubus *du = &cl->dispatch.ubus;
 366         const char *sid;
 367         uint32_t id;
 368         int err;
 369
 370         sid = uh_ubus_get_auth(cl->hdr.head);
 371
 372         if (!conf.ubus_noauth && !uh_ubus_allowed(sid, path, ":subscribe")) {
 373                 uh_ubus_send_header(cl, 200, "OK", "application/json");
 374                 uh_ubus_posix_error(cl, EACCES);
 375                 return;
 376         }
 377
 378         du->sub.cb = uh_ubus_subscription_notification_cb;
 379         du->sub.remove_cb = uh_ubus_subscription_notification_remove_cb;
 380
 381         uh_client_ref(cl);
 382
 383         err = ubus_register_subscriber(ctx, &du->sub);
 384         if (err)
 385                 goto err_unref;
 386
 387         err = ubus_lookup_id(ctx, path, &id);
 388         if (err)
 389                 goto err_unregister;
 390
 391         err = ubus_subscribe(ctx, &du->sub, id);
 392         if (err)
 393                 goto err_unregister;
 394
 395         uh_ubus_send_header(cl, 200, "OK", "text/event-stream");
 396
 397         if (conf.events_retry)
 398                 ops->chunk_printf(cl, "retry: %d\n", conf.events_retry);
 399
 400         return;
 401
 402 err_unregister:
 403         ubus_unregister_subscriber(ctx, &du->sub);
 404 err_unref:
 405         uh_client_unref(cl);
 406         if (err) {
 407                 uh_ubus_send_header(cl, 200, "OK", "application/json");
 408                 uh_ubus_ubus_error(cl, err);
 409         }
 410 }
 411
 412 static void uh_ubus_handle_get(struct client *cl)
 413 {
 414         struct dispatch_ubus *du = &cl->dispatch.ubus;
 415         const char *url = du->url_path;
 416
 417         url += strlen(conf.ubus_prefix);
 418
 419         if (!strcmp(url, "/list") || !strncmp(url, "/list/", strlen("/list/"))) {
 420                 url += strlen("/list");
 421
 422                 uh_ubus_handle_get_list(cl, *url ? url + 1 : NULL);
 423         } else if (!strncmp(url, "/subscribe/", strlen("/subscribe/"))) {
 424                 url += strlen("/subscribe");
 425
 426                 uh_ubus_handle_get_subscribe(cl, url + 1);
 427         } else {
 428                 ops->http_header(cl, 404, "Not Found");
 429                 ustream_printf(cl->us, "\r\n");
 430                 ops->request_done(cl);
 431         }
 432 }
 433
 434 /* POST requests handling */
 435
 436 static void
 437 uh_ubus_request_data_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 438 {
 439         struct dispatch_ubus *du = container_of(req, struct dispatch_ubus, req);
 440         struct blob_attr *cur;
 441         int len;
 442
 443         blob_for_each_attr(cur, msg, len)
 444                 blobmsg_add_blob(&du->buf, cur);
 445 }
 446
 447 static void
 448 uh_ubus_request_cb(struct ubus_request *req, int ret)
 449 {
 450         struct dispatch_ubus *du = container_of(req, struct dispatch_ubus, req);
 451         struct client *cl = container_of(du, struct client, dispatch.ubus);
 452         struct blob_attr *cur;
 453         void *r;
 454         int rem;
 455
 456         blob_buf_init(&buf, 0);
 457
 458         uloop_timeout_cancel(&du->timeout);
 459
 460         /* Legacy format always uses "result" array - even for errors and empty
 461          * results. */
 462         if (du->legacy) {
 463                 void *c;
 464
 465                 uh_ubus_init_json_rpc_response(cl, &buf);
 466                 r = blobmsg_open_array(&buf, "result");
 467                 blobmsg_add_u32(&buf, "", ret);
 468
 469                 if (blob_len(du->buf.head)) {
 470                         c = blobmsg_open_table(&buf, NULL);
 471                         blob_for_each_attr(cur, du->buf.head, rem)
 472                                 blobmsg_add_blob(&buf, cur);
 473                         blobmsg_close_table(&buf, c);
 474                 }
 475
 476                 blobmsg_close_array(&buf, r);
 477                 uh_ubus_send_response(cl, &buf);
 478                 return;
 479         }
 480
 481         if (ret) {
 482                 void *c;
 483
 484                 uh_ubus_init_json_rpc_response(cl, &buf);
 485                 c = blobmsg_open_table(&buf, "error");
 486                 blobmsg_add_u32(&buf, "code", ret);
 487                 blobmsg_add_string(&buf, "message", ubus_strerror(ret));
 488                 blobmsg_close_table(&buf, c);
 489                 uh_ubus_send_response(cl, &buf);
 490         } else {
 491                 uh_ubus_init_json_rpc_response(cl, &buf);
 492                 if (blob_len(du->buf.head)) {
 493                         r = blobmsg_open_table(&buf, "result");
 494                         blob_for_each_attr(cur, du->buf.head, rem)
 495                                 blobmsg_add_blob(&buf, cur);
 496                         blobmsg_close_table(&buf, r);
 497                 } else {
 498                         blobmsg_add_field(&buf, BLOBMSG_TYPE_UNSPEC, "result", NULL, 0);
 499                 }
 500                 uh_ubus_send_response(cl, &buf);
 501         }
 502
 503 }
 504
 505 static void
 506 uh_ubus_timeout_cb(struct uloop_timeout *timeout)
 507 {
 508         struct dispatch_ubus *du = container_of(timeout, struct dispatch_ubus, timeout);
 509         struct client *cl = container_of(du, struct client, dispatch.ubus);
 510
 511         ubus_abort_request(ctx, &du->req);
 512         uh_ubus_json_rpc_error(cl, ERROR_TIMEOUT);
 513 }
 514
 515 static void uh_ubus_close_fds(struct client *cl)
 516 {
 517         if (ctx->sock.fd < 0)
 518                 return;
 519
 520         close(ctx->sock.fd);
 521         ctx->sock.fd = -1;
 522 }
 523
 524 static void uh_ubus_request_free(struct client *cl)
 525 {
 526         struct dispatch_ubus *du = &cl->dispatch.ubus;
 527
 528         blob_buf_free(&du->buf);
 529         uloop_timeout_cancel(&du->timeout);
 530
 531         if (du->jsobj)
 532                 json_object_put(du->jsobj);
 533
 534         if (du->jstok)
 535                 json_tokener_free(du->jstok);
 536
 537         if (du->req_pending)
 538                 ubus_abort_request(ctx, &du->req);
 539
 540         free(du->url_path);
 541         du->url_path = NULL;
 542 }
 543
 544 static void uh_ubus_single_error(struct client *cl, enum rpc_error type)
 545 {
 546         uh_ubus_send_header(cl, 200, "OK", "application/json");
 547         uh_ubus_json_rpc_error(cl, type);
 548         ops->request_done(cl);
 549 }
 550
 551 static void uh_ubus_send_request(struct client *cl, const char *sid, struct blob_attr *args)
 552 {
 553         struct dispatch *d = &cl->dispatch;
 554         struct dispatch_ubus *du = &d->ubus;
 555         struct blob_attr *cur;
 556         static struct blob_buf req;
 557         int ret, rem;
 558
 559         blob_buf_init(&req, 0);
 560         blobmsg_for_each_attr(cur, args, rem) {
 561                 if (!strcmp(blobmsg_name(cur), "ubus_rpc_session"))
 562                         return uh_ubus_json_rpc_error(cl, ERROR_PARAMS);
 563                 blobmsg_add_blob(&req, cur);
 564         }
 565
 566         blobmsg_add_string(&req, "ubus_rpc_session", sid);
 567
 568         blob_buf_init(&du->buf, 0);
 569         memset(&du->req, 0, sizeof(du->req));
 570         ret = ubus_invoke_async(ctx, du->obj, du->func, req.head, &du->req);
 571         if (ret)
 572                 return uh_ubus_json_rpc_error(cl, ERROR_INTERNAL);
 573
 574         du->req.data_cb = uh_ubus_request_data_cb;
 575         du->req.complete_cb = uh_ubus_request_cb;
 576         ubus_complete_request_async(ctx, &du->req);
 577
 578         du->timeout.cb = uh_ubus_timeout_cb;
 579         uloop_timeout_set(&du->timeout, conf.script_timeout * 1000);
 580
 581         du->req_pending = true;
 582 }
 583
 584 static void uh_ubus_list_cb(struct ubus_context *ctx, struct ubus_object_data *obj, void *priv)
 585 {
 586         struct blob_attr *sig, *attr;
 587         struct list_data *data = priv;
 588         int rem, rem2;
 589         void *t, *o;
 590
 591         if (!data->verbose) {
 592                 blobmsg_add_string(data->buf, NULL, obj->path);
 593                 return;
 594         }
 595
 596         if (!obj->signature)
 597                 return;
 598
 599         if (data->add_object)
 600                 o = blobmsg_open_table(data->buf, obj->path);
 601         blob_for_each_attr(sig, obj->signature, rem) {
 602                 t = blobmsg_open_table(data->buf, blobmsg_name(sig));
 603                 rem2 = blobmsg_data_len(sig);
 604                 __blob_for_each_attr(attr, blobmsg_data(sig), rem2) {
 605                         if (blob_id(attr) != BLOBMSG_TYPE_INT32)
 606                                 continue;
 607
 608                         switch (blobmsg_get_u32(attr)) {
 609                         case BLOBMSG_TYPE_INT8:
 610                                 blobmsg_add_string(data->buf, blobmsg_name(attr), "boolean");
 611                                 break;
 612                         case BLOBMSG_TYPE_INT32:
 613                                 blobmsg_add_string(data->buf, blobmsg_name(attr), "number");
 614                                 break;
 615                         case BLOBMSG_TYPE_STRING:
 616                                 blobmsg_add_string(data->buf, blobmsg_name(attr), "string");
 617                                 break;
 618                         case BLOBMSG_TYPE_ARRAY:
 619                                 blobmsg_add_string(data->buf, blobmsg_name(attr), "array");
 620                                 break;
 621                         case BLOBMSG_TYPE_TABLE:
 622                                 blobmsg_add_string(data->buf, blobmsg_name(attr), "object");
 623                                 break;
 624                         default:
 625                                 blobmsg_add_string(data->buf, blobmsg_name(attr), "unknown");
 626                                 break;
 627                         }
 628                 }
 629                 blobmsg_close_table(data->buf, t);
 630         }
 631         if (data->add_object)
 632                 blobmsg_close_table(data->buf, o);
 633 }
 634
 635 static void uh_ubus_send_list(struct client *cl, struct blob_attr *params)
 636 {
 637         struct blob_attr *cur, *dup;
 638         struct list_data data = { .buf = &cl->dispatch.ubus.buf, .verbose = false, .add_object = true };
 639         void *r;
 640         int rem;
 641
 642         blob_buf_init(data.buf, 0);
 643
 644         uh_client_ref(cl);
 645
 646         if (!params || blob_id(params) != BLOBMSG_TYPE_ARRAY) {
 647                 r = blobmsg_open_array(data.buf, "result");
 648                 ubus_lookup(ctx, NULL, uh_ubus_list_cb, &data);
 649                 blobmsg_close_array(data.buf, r);
 650         }
 651         else {
 652                 r = blobmsg_open_table(data.buf, "result");
 653                 dup = blob_memdup(params);
 654                 if (dup)
 655                 {
 656                         rem = blobmsg_data_len(dup);
 657                         data.verbose = true;
 658                         __blob_for_each_attr(cur, blobmsg_data(dup), rem)
 659                                 ubus_lookup(ctx, blobmsg_data(cur), uh_ubus_list_cb, &data);
 660                         free(dup);
 661                 }
 662                 blobmsg_close_table(data.buf, r);
 663         }
 664
 665         uh_client_unref(cl);
 666
 667         blob_buf_init(&buf, 0);
 668         uh_ubus_init_json_rpc_response(cl, &buf);
 669         blobmsg_add_blob(&buf, blob_data(data.buf->head));
 670         uh_ubus_send_response(cl, &buf);
 671 }
 672
 673 static bool parse_json_rpc(struct rpc_data *d, struct blob_attr *data)
 674 {
 675         struct blob_attr *tb[__RPC_MAX];
 676         struct blob_attr *cur;
 677
 678         blobmsg_parse(rpc_policy, __RPC_MAX, tb, blob_data(data), blob_len(data));
 679
 680         cur = tb[RPC_JSONRPC];
 681         if (!cur || strcmp(blobmsg_data(cur), "2.0") != 0)
 682                 return false;
 683
 684         cur = tb[RPC_METHOD];
 685         if (!cur)
 686                 return false;
 687
 688         d->id = tb[RPC_ID];
 689         d->method = blobmsg_data(cur);
 690
 691         cur = tb[RPC_PARAMS];
 692         if (!cur)
 693                 return true;
 694
 695         d->params = blob_memdup(cur);
 696         if (!d->params)
 697                 return false;
 698
 699         return true;
 700 }
 701
 702 static void parse_call_params(struct rpc_data *d)
 703 {
 704         const struct blobmsg_policy data_policy[] = {
 705                 { .type = BLOBMSG_TYPE_STRING },
 706                 { .type = BLOBMSG_TYPE_STRING },
 707                 { .type = BLOBMSG_TYPE_STRING },
 708                 { .type = BLOBMSG_TYPE_TABLE },
 709         };
 710         struct blob_attr *tb[4];
 711
 712         if (!d->params || blobmsg_type(d->params) != BLOBMSG_TYPE_ARRAY)
 713                 return;
 714
 715         blobmsg_parse_array(data_policy, ARRAY_SIZE(data_policy), tb,
 716                             blobmsg_data(d->params), blobmsg_data_len(d->params));
 717
 718         if (tb[0])
 719                 d->sid = blobmsg_data(tb[0]);
 720
 721         if (conf.ubus_noauth && (!d->sid || !*d->sid))
 722                 d->sid = UH_UBUS_DEFAULT_SID;
 723
 724         if (tb[1])
 725                 d->object = blobmsg_data(tb[1]);
 726
 727         if (tb[2])
 728                 d->function = blobmsg_data(tb[2]);
 729
 730         d->data = tb[3];
 731 }
 732
 733 static void uh_ubus_init_batch(struct client *cl)
 734 {
 735         struct dispatch_ubus *du = &cl->dispatch.ubus;
 736
 737         du->array = true;
 738         uh_ubus_send_header(cl, 200, "OK", "application/json");
 739         ops->chunk_printf(cl, "[");
 740 }
 741
 742 static void uh_ubus_complete_batch(struct client *cl)
 743 {
 744         ops->chunk_printf(cl, "]");
 745         ops->request_done(cl);
 746 }
 747
 748 static void uh_ubus_handle_request_object(struct client *cl, struct json_object *obj)
 749 {
 750         struct dispatch_ubus *du = &cl->dispatch.ubus;
 751         struct rpc_data data = {};
 752         enum rpc_error err = ERROR_PARSE;
 753         static struct blob_buf req;
 754
 755         uh_client_ref(cl);
 756
 757         if (json_object_get_type(obj) != json_type_object)
 758                 goto error;
 759
 760         du->jsobj_cur = obj;
 761         blob_buf_init(&req, 0);
 762         if (!blobmsg_add_object(&req, obj))
 763                 goto error;
 764
 765         if (!parse_json_rpc(&data, req.head))
 766                 goto error;
 767
 768         if (!strcmp(data.method, "call")) {
 769                 parse_call_params(&data);
 770
 771                 if (!data.sid || !data.object || !data.function || !data.data)
 772                         goto error;
 773
 774                 du->func = data.function;
 775                 if (ubus_lookup_id(ctx, data.object, &du->obj)) {
 776                         err = ERROR_OBJECT;
 777                         goto error;
 778                 }
 779
 780                 if (!conf.ubus_noauth && !uh_ubus_allowed(data.sid, data.object, data.function)) {
 781                         err = ERROR_ACCESS;
 782                         goto error;
 783                 }
 784
 785                 uh_ubus_send_request(cl, data.sid, data.data);
 786                 goto out;
 787         }
 788         else if (!strcmp(data.method, "list")) {
 789                 uh_ubus_send_list(cl, data.params);
 790                 goto out;
 791         }
 792         else {
 793                 err = ERROR_METHOD;
 794                 goto error;
 795         }
 796
 797 error:
 798         uh_ubus_json_rpc_error(cl, err);
 799 out:
 800         if (data.params)
 801                 free(data.params);
 802
 803         uh_client_unref(cl);
 804 }
 805
 806 static void __uh_ubus_next_batched_request(struct uloop_timeout *timeout)
 807 {
 808         struct dispatch_ubus *du = container_of(timeout, struct dispatch_ubus, timeout);
 809         struct client *cl = container_of(du, struct client, dispatch.ubus);
 810         struct json_object *obj = du->jsobj;
 811         int len;
 812
 813         len = json_object_array_length(obj);
 814         if (du->array_idx >= len)
 815                 return uh_ubus_complete_batch(cl);
 816
 817         obj = json_object_array_get_idx(obj, du->array_idx++);
 818         uh_ubus_handle_request_object(cl, obj);
 819 }
 820
 821 static void uh_ubus_data_done(struct client *cl)
 822 {
 823         struct dispatch_ubus *du = &cl->dispatch.ubus;
 824         struct json_object *obj = du->jsobj;
 825
 826         switch (obj ? json_object_get_type(obj) : json_type_null) {
 827         case json_type_object:
 828                 uh_ubus_send_header(cl, 200, "OK", "application/json");
 829                 return uh_ubus_handle_request_object(cl, obj);
 830         case json_type_array:
 831                 uh_ubus_init_batch(cl);
 832                 return uh_ubus_next_batched_request(cl);
 833         default:
 834                 return uh_ubus_single_error(cl, ERROR_PARSE);
 835         }
 836 }
 837
 838 static void uh_ubus_call(struct client *cl, const char *path, const char *sid)
 839 {
 840         struct dispatch_ubus *du = &cl->dispatch.ubus;
 841         struct json_object *obj = du->jsobj;
 842         struct rpc_data data = {};
 843         enum rpc_error err = ERROR_PARSE;
 844         static struct blob_buf req;
 845
 846         uh_client_ref(cl);
 847
 848         if (!obj || json_object_get_type(obj) != json_type_object)
 849                 goto error;
 850
 851         uh_ubus_send_header(cl, 200, "OK", "application/json");
 852
 853         du->jsobj_cur = obj;
 854         blob_buf_init(&req, 0);
 855         if (!blobmsg_add_object(&req, obj))
 856                 goto error;
 857
 858         if (!parse_json_rpc(&data, req.head))
 859                 goto error;
 860
 861         du->func = data.method;
 862         if (ubus_lookup_id(ctx, path, &du->obj)) {
 863                 err = ERROR_OBJECT;
 864                 goto error;
 865         }
 866
 867         if (!conf.ubus_noauth && !uh_ubus_allowed(sid, path, data.method)) {
 868                 err = ERROR_ACCESS;
 869                 goto error;
 870         }
 871
 872         uh_ubus_send_request(cl, sid, data.params);
 873         goto out;
 874
 875 error:
 876         uh_ubus_json_rpc_error(cl, err);
 877 out:
 878         if (data.params)
 879                 free(data.params);
 880
 881         uh_client_unref(cl);
 882 }
 883
 884 static void uh_ubus_handle_post(struct client *cl)
 885 {
 886         struct dispatch_ubus *du = &cl->dispatch.ubus;
 887         const char *url = du->url_path;
 888         const char *auth;
 889
 890         /* Treat both: /foo AND /foo/ as legacy requests. */
 891         if (ops->path_match(conf.ubus_prefix, url) && strlen(url) - strlen(conf.ubus_prefix) <= 1) {
 892                 du->legacy = true;
 893                 uh_ubus_data_done(cl);
 894                 return;
 895         }
 896
 897         auth = uh_ubus_get_auth(cl->hdr.head);
 898
 899         url += strlen(conf.ubus_prefix);
 900
 901         if (!strncmp(url, "/call/", strlen("/call/"))) {
 902                 url += strlen("/call/");
 903
 904                 uh_ubus_call(cl, url, auth);
 905         } else {
 906                 ops->http_header(cl, 404, "Not Found");
 907                 ustream_printf(cl->us, "\r\n");
 908                 ops->request_done(cl);
 909         }
 910 }
 911
 912 static int uh_ubus_data_send(struct client *cl, const char *data, int len)
 913 {
 914         struct dispatch_ubus *du = &cl->dispatch.ubus;
 915
 916         if (du->jsobj || !du->jstok)
 917                 goto error;
 918
 919         du->post_len += len;
 920         if (du->post_len > UH_UBUS_MAX_POST_SIZE)
 921                 goto error;
 922
 923         du->jsobj = json_tokener_parse_ex(du->jstok, data, len);
 924         return len;
 925
 926 error:
 927         uh_ubus_single_error(cl, ERROR_PARSE);
 928         return 0;
 929 }
 930
 931 static void uh_ubus_handle_request(struct client *cl, char *url, struct path_info *pi)
 932 {
 933         struct dispatch *d = &cl->dispatch;
 934         struct dispatch_ubus *du = &d->ubus;
 935         char *chr;
 936
 937         du->url_path = strdup(url);
 938         if (!du->url_path) {
 939                 ops->client_error(cl, 500, "Internal Server Error", "Failed to allocate resources");
 940                 return;
 941         }
 942         chr = strchr(du->url_path, '?');
 943         if (chr)
 944                 chr[0] = '\0';
 945
 946         du->legacy = false;
 947
 948         switch (cl->request.method)
 949         {
 950         case UH_HTTP_MSG_GET:
 951                 uh_ubus_handle_get(cl);
 952                 break;
 953         case UH_HTTP_MSG_POST:
 954                 d->data_send = uh_ubus_data_send;
 955                 d->data_done = uh_ubus_handle_post;
 956                 d->close_fds = uh_ubus_close_fds;
 957                 d->free = uh_ubus_request_free;
 958                 du->jstok = json_tokener_new();
 959                 return;
 960
 961         case UH_HTTP_MSG_OPTIONS:
 962                 uh_ubus_send_header(cl, 200, "OK", "application/json");
 963                 ops->request_done(cl);
 964                 break;
 965
 966         default:
 967                 ops->client_error(cl, 400, "Bad Request", "Invalid Request");
 968         }
 969
 970         free(du->url_path);
 971         du->url_path = NULL;
 972 }
 973
 974 static bool
 975 uh_ubus_check_url(const char *url)
 976 {
 977         return ops->path_match(conf.ubus_prefix, url);
 978 }
 979
 980 static int
 981 uh_ubus_init(void)
 982 {
 983         static struct dispatch_handler ubus_dispatch = {
 984                 .check_url = uh_ubus_check_url,
 985                 .handle_request = uh_ubus_handle_request,
 986         };
 987
 988         ctx = ubus_connect(conf.ubus_socket);
 989         if (!ctx) {
 990                 fprintf(stderr, "Unable to connect to ubus socket\n");
 991                 exit(1);
 992         }
 993
 994         ops->dispatch_add(&ubus_dispatch);
 995
 996         uloop_done();
 997         return 0;
 998 }
 999
1000
1001 static int uh_ubus_plugin_init(const struct uhttpd_ops *o, struct config *c)
1002 {
1003         ops = o;
1004         _conf = c;
1005         return uh_ubus_init();
1006 }
1007
1008 static void uh_ubus_post_init(void)
1009 {
1010         ubus_add_uloop(ctx);
1011 }
1012
1013 struct uhttpd_plugin uhttpd_plugin = {
1014         .init = uh_ubus_plugin_init,
1015         .post_init = uh_ubus_post_init,
1016 };