file.c

   1 /*
   2  * rpcd - UBUS RPC server
   3  *
   4  *   Copyright (C) 2013-2014 Jo-Philipp Wich <jow@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include <fcntl.h>
  20 #include <errno.h>
  21 #include <unistd.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <limits.h>
  25 #include <dirent.h>
  26 #include <sys/stat.h>
  27 #include <sys/wait.h>
  28 #include <libubus.h>
  29 #include <libubox/blobmsg.h>
  30 #include <libubox/md5.h>
  31 #include <libubox/ustream.h>
  32 #include <libubox/utils.h>
  33
  34 #include <rpcd/plugin.h>
  35
  36 /* limit of sys & proc files */
  37 #define RPC_FILE_MIN_SIZE               (128)
  38
  39 /* limit of regular files and command output data */
  40 #define RPC_FILE_MAX_SIZE               (4096 * 64)
  41 #define RPC_FILE_MAX_RUNTIME    (3 * 1000)
  42
  43 #define ustream_for_each_read_buffer(stream, ptr, len) \
  44         for (ptr = ustream_get_read_buf(stream, &len);     \
  45              ptr != NULL && len > 0;                       \
  46              ustream_consume(stream, len), ptr = ustream_get_read_buf(stream, &len))
  47
  48 #define ustream_declare(us, fd, name)                     \
  49         us.stream.string_data   = true;                       \
  50         us.stream.r.buffer_len  = 4096;                       \
  51         us.stream.r.max_buffers = RPC_FILE_MAX_SIZE / 4096;   \
  52         us.stream.notify_read   = rpc_file_##name##_read_cb;  \
  53         us.stream.notify_state  = rpc_file_##name##_state_cb; \
  54         ustream_fd_init(&us, fd);
  55
  56 struct rpc_file_exec_context {
  57         struct ubus_context *context;
  58         struct ubus_request_data request;
  59         struct uloop_timeout timeout;
  60         struct uloop_process process;
  61         struct ustream_fd opipe;
  62         struct ustream_fd epipe;
  63         int outlen;
  64         char *out;
  65         int errlen;
  66         char *err;
  67         int stat;
  68 };
  69
  70
  71 static struct blob_buf buf;
  72
  73 enum {
  74         RPC_F_R_PATH,
  75         __RPC_F_R_MAX,
  76 };
  77
  78 static const struct blobmsg_policy rpc_file_r_policy[__RPC_F_R_MAX] = {
  79         [RPC_F_R_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
  80 };
  81
  82 enum {
  83         RPC_F_RB_PATH,
  84         RPC_F_RB_BASE64,
  85         __RPC_F_RB_MAX,
  86 };
  87
  88 static const struct blobmsg_policy rpc_file_rb_policy[__RPC_F_RB_MAX] = {
  89         [RPC_F_RB_PATH]   = { .name = "path",   .type = BLOBMSG_TYPE_STRING },
  90         [RPC_F_RB_BASE64] = { .name = "base64", .type = BLOBMSG_TYPE_BOOL   },
  91 };
  92
  93 enum {
  94         RPC_F_RW_PATH,
  95         RPC_F_RW_DATA,
  96         RPC_F_RW_BASE64,
  97         __RPC_F_RW_MAX,
  98 };
  99
 100 static const struct blobmsg_policy rpc_file_rw_policy[__RPC_F_RW_MAX] = {
 101         [RPC_F_RW_PATH]   = { .name = "path",   .type = BLOBMSG_TYPE_STRING },
 102         [RPC_F_RW_DATA]   = { .name = "data",   .type = BLOBMSG_TYPE_STRING },
 103         [RPC_F_RW_BASE64] = { .name = "base64", .type = BLOBMSG_TYPE_BOOL   },
 104 };
 105
 106 enum {
 107         RPC_E_CMD,
 108         RPC_E_PARM,
 109         RPC_E_ENV,
 110         __RPC_E_MAX,
 111 };
 112
 113 static const struct blobmsg_policy rpc_exec_policy[__RPC_E_MAX] = {
 114         [RPC_E_CMD]  = { .name = "command", .type = BLOBMSG_TYPE_STRING },
 115         [RPC_E_PARM] = { .name = "params",  .type = BLOBMSG_TYPE_ARRAY  },
 116         [RPC_E_ENV]  = { .name = "env",     .type = BLOBMSG_TYPE_TABLE  },
 117 };
 118
 119 static const char *d_types[] = {
 120         [DT_BLK]     = "block",
 121         [DT_CHR]     = "char",
 122         [DT_DIR]     = "directory",
 123         [DT_FIFO]    = "fifo",
 124         [DT_LNK]     = "symlink",
 125         [DT_REG]     = "file",
 126         [DT_SOCK]    = "socket",
 127         [DT_UNKNOWN] = "unknown",
 128 };
 129
 130
 131 static int
 132 rpc_errno_status(void)
 133 {
 134         switch (errno)
 135         {
 136         case EACCES:
 137                 return UBUS_STATUS_PERMISSION_DENIED;
 138
 139         case ENOTDIR:
 140                 return UBUS_STATUS_INVALID_ARGUMENT;
 141
 142         case ENOENT:
 143                 return UBUS_STATUS_NOT_FOUND;
 144
 145         case EINVAL:
 146                 return UBUS_STATUS_INVALID_ARGUMENT;
 147
 148         default:
 149                 return UBUS_STATUS_UNKNOWN_ERROR;
 150         }
 151 }
 152
 153 static struct blob_attr **
 154 rpc_check_path(struct blob_attr *msg, char **path, struct stat *s)
 155 {
 156         static struct blob_attr *tb[__RPC_F_R_MAX];
 157
 158         blobmsg_parse(rpc_file_r_policy, __RPC_F_R_MAX, tb, blob_data(msg), blob_len(msg));
 159
 160         if (!tb[RPC_F_R_PATH])
 161         {
 162                 errno = EINVAL;
 163                 return NULL;
 164         }
 165
 166         *path = blobmsg_data(tb[RPC_F_R_PATH]);
 167
 168         if (stat(*path, s))
 169                 return NULL;
 170
 171         return tb;
 172 }
 173
 174 static int
 175 rpc_file_read(struct ubus_context *ctx, struct ubus_object *obj,
 176               struct ubus_request_data *req, const char *method,
 177               struct blob_attr *msg)
 178 {
 179         static struct blob_attr *tb[__RPC_F_RB_MAX];
 180         bool base64 = false;
 181         int fd, rv;
 182         ssize_t len;
 183         char *path;
 184         struct stat s;
 185         char *wbuf;
 186
 187         blobmsg_parse(rpc_file_rb_policy, __RPC_F_RB_MAX, tb, blob_data(msg), blob_len(msg));
 188
 189         if (!tb[RPC_F_RB_PATH])
 190                 return rpc_errno_status();
 191
 192         path = blobmsg_data(tb[RPC_F_RB_PATH]);
 193
 194         if (stat(path, &s))
 195                 return rpc_errno_status();
 196
 197         if (s.st_size >= RPC_FILE_MAX_SIZE)
 198                 return UBUS_STATUS_NOT_SUPPORTED;
 199
 200         if ((fd = open(path, O_RDONLY)) < 0)
 201                 return rpc_errno_status();
 202
 203         /* some sysfs files do not report a length */
 204         if (s.st_size == 0)
 205                 s.st_size = RPC_FILE_MIN_SIZE;
 206
 207         blob_buf_init(&buf, 0);
 208
 209         if (tb[RPC_F_RB_BASE64])
 210                 base64 = blobmsg_get_bool(tb[RPC_F_RB_BASE64]);
 211
 212         len = s.st_size + 1;
 213         if (base64)
 214                 len = B64_ENCODE_LEN(s.st_size);
 215         wbuf = blobmsg_alloc_string_buffer(&buf, "data", len);
 216
 217         if (!wbuf)
 218         {
 219                 rv = UBUS_STATUS_UNKNOWN_ERROR;
 220                 goto out;
 221         }
 222
 223         if ((len = read(fd, wbuf, s.st_size)) <= 0)
 224         {
 225                 rv = UBUS_STATUS_NO_DATA;
 226                 goto out;
 227         }
 228
 229         if (base64)
 230         {
 231                 uint8_t *data = calloc(len, sizeof(uint8_t));
 232                 if (!data)
 233                 {
 234                         rv = UBUS_STATUS_UNKNOWN_ERROR;
 235                         goto out;
 236                 }
 237                 memcpy(data, wbuf, len);
 238
 239                 len = b64_encode(data, len, wbuf, B64_ENCODE_LEN(len));
 240                 free(data);
 241                 if (len < 0)
 242                 {
 243                         rv = UBUS_STATUS_UNKNOWN_ERROR;
 244                         goto out;
 245                 }
 246         }
 247
 248         *(wbuf + len) = 0;
 249         blobmsg_add_string_buffer(&buf);
 250
 251         ubus_send_reply(ctx, req, buf.head);
 252         rv = UBUS_STATUS_OK;
 253
 254 out:
 255         blob_buf_free(&buf);
 256         close(fd);
 257         return rv;
 258 }
 259
 260 static int
 261 rpc_file_write(struct ubus_context *ctx, struct ubus_object *obj,
 262                struct ubus_request_data *req, const char *method,
 263                struct blob_attr *msg)
 264 {
 265         struct blob_attr *tb[__RPC_F_RW_MAX];
 266         int fd, rv = 0;
 267         void *data = NULL;
 268         size_t data_len = 0;
 269
 270         blobmsg_parse(rpc_file_rw_policy, __RPC_F_RW_MAX, tb,
 271                       blob_data(msg), blob_len(msg));
 272
 273         if (!tb[RPC_F_RW_PATH] || !tb[RPC_F_RW_DATA])
 274                 return UBUS_STATUS_INVALID_ARGUMENT;
 275
 276         data = blobmsg_data(tb[RPC_F_RW_DATA]);
 277         data_len = blobmsg_data_len(tb[RPC_F_RW_DATA]) - 1;
 278
 279         if ((fd = open(blobmsg_data(tb[RPC_F_RW_PATH]), O_CREAT | O_TRUNC | O_WRONLY, 0666)) < 0)
 280                 return rpc_errno_status();
 281
 282         if (tb[RPC_F_RW_BASE64] && blobmsg_get_bool(tb[RPC_F_RW_BASE64]))
 283         {
 284                 data_len = b64_decode(data, data, data_len);
 285                 if (data_len < 0)
 286                 {
 287                         rv = UBUS_STATUS_UNKNOWN_ERROR;
 288                         goto out;
 289                 }
 290         }
 291
 292         if (write(fd, data, data_len) < 0)
 293                 rv = -1;
 294
 295 out:
 296         if (fsync(fd) < 0)
 297                 rv = -1;
 298
 299         close(fd);
 300         sync();
 301
 302         if (rv)
 303                 return rpc_errno_status();
 304
 305         return 0;
 306 }
 307
 308 static int
 309 rpc_file_md5(struct ubus_context *ctx, struct ubus_object *obj,
 310              struct ubus_request_data *req, const char *method,
 311              struct blob_attr *msg)
 312 {
 313         int rv, i;
 314         char *path;
 315         struct stat s;
 316         uint8_t md5[16];
 317         char *wbuf;
 318
 319         if (!rpc_check_path(msg, &path, &s))
 320                 return rpc_errno_status();
 321
 322         if (!S_ISREG(s.st_mode))
 323                 return UBUS_STATUS_NOT_SUPPORTED;
 324
 325         if ((rv = md5sum(path, md5)) <= 0)
 326                 return rpc_errno_status();
 327
 328         blob_buf_init(&buf, 0);
 329         wbuf = blobmsg_alloc_string_buffer(&buf, "md5", 33);
 330
 331         for (i = 0; i < 16; i++)
 332                 sprintf(wbuf + (i * 2), "%02x", (uint8_t) md5[i]);
 333
 334         blobmsg_add_string_buffer(&buf);
 335         ubus_send_reply(ctx, req, buf.head);
 336         blob_buf_free(&buf);
 337
 338         return UBUS_STATUS_OK;
 339 }
 340
 341 static int
 342 rpc_file_list(struct ubus_context *ctx, struct ubus_object *obj,
 343               struct ubus_request_data *req, const char *method,
 344               struct blob_attr *msg)
 345 {
 346         DIR *fd;
 347         void *c, *d;
 348         char *path;
 349         struct stat s;
 350         struct dirent *e;
 351
 352         if (!rpc_check_path(msg, &path, &s))
 353                 return rpc_errno_status();
 354
 355         if ((fd = opendir(path)) == NULL)
 356                 return rpc_errno_status();
 357
 358         blob_buf_init(&buf, 0);
 359         c = blobmsg_open_array(&buf, "entries");
 360
 361         while ((e = readdir(fd)) != NULL)
 362         {
 363                 if (!strcmp(e->d_name, ".") || !strcmp(e->d_name, ".."))
 364                         continue;
 365
 366                 d = blobmsg_open_table(&buf, NULL);
 367                 blobmsg_add_string(&buf, "name", e->d_name);
 368                 blobmsg_add_string(&buf, "type", d_types[e->d_type]);
 369                 blobmsg_close_table(&buf, d);
 370         }
 371
 372         closedir(fd);
 373
 374         blobmsg_close_array(&buf, c);
 375         ubus_send_reply(ctx, req, buf.head);
 376         blob_buf_free(&buf);
 377
 378         return 0;
 379 }
 380
 381 static int
 382 rpc_file_stat(struct ubus_context *ctx, struct ubus_object *obj,
 383               struct ubus_request_data *req, const char *method,
 384               struct blob_attr *msg)
 385 {
 386         int type;
 387         char *path;
 388         struct stat s;
 389
 390         if (!rpc_check_path(msg, &path, &s))
 391                 return rpc_errno_status();
 392
 393         blob_buf_init(&buf, 0);
 394
 395         type = S_ISREG(s.st_mode) ? DT_REG :
 396                 S_ISDIR(s.st_mode) ? DT_DIR :
 397                  S_ISCHR(s.st_mode) ? DT_CHR :
 398                   S_ISBLK(s.st_mode) ? DT_BLK :
 399                    S_ISFIFO(s.st_mode) ? DT_FIFO :
 400                     S_ISLNK(s.st_mode) ? DT_LNK :
 401                      S_ISSOCK(s.st_mode) ? DT_SOCK :
 402                       DT_UNKNOWN;
 403
 404         blobmsg_add_string(&buf, "path", path);
 405         blobmsg_add_string(&buf, "type", d_types[type]);
 406         blobmsg_add_u32(&buf, "size",  s.st_size);
 407         blobmsg_add_u32(&buf, "mode",  s.st_mode);
 408         blobmsg_add_u32(&buf, "atime", s.st_atime);
 409         blobmsg_add_u32(&buf, "mtime", s.st_mtime);
 410         blobmsg_add_u32(&buf, "ctime", s.st_ctime);
 411         blobmsg_add_u32(&buf, "inode", s.st_ino);
 412         blobmsg_add_u32(&buf, "uid",   s.st_uid);
 413         blobmsg_add_u32(&buf, "gid",   s.st_gid);
 414
 415         ubus_send_reply(ctx, req, buf.head);
 416         blob_buf_free(&buf);
 417
 418         return 0;
 419 }
 420
 421 static const char *
 422 rpc_file_exec_lookup(const char *cmd)
 423 {
 424         struct stat s;
 425         int plen = 0, clen = strlen(cmd) + 1;
 426         char *search, *p;
 427         static char path[PATH_MAX];
 428
 429         if (!stat(cmd, &s) && S_ISREG(s.st_mode))
 430                 return cmd;
 431
 432         search = getenv("PATH");
 433
 434         if (!search)
 435                 search = "/bin:/usr/bin:/sbin:/usr/sbin";
 436
 437         p = search;
 438
 439         do
 440         {
 441                 if (*p != ':' && *p != '\0')
 442                         continue;
 443
 444                 plen = p - search;
 445
 446                 if ((plen + clen) >= sizeof(path))
 447                         continue;
 448
 449                 strncpy(path, search, plen);
 450                 sprintf(path + plen, "/%s", cmd);
 451
 452                 if (!stat(path, &s) && S_ISREG(s.st_mode))
 453                         return path;
 454
 455                 search = p + 1;
 456         }
 457         while (*p++);
 458
 459         return NULL;
 460 }
 461
 462
 463 static void
 464 rpc_ustream_to_blobmsg(struct ustream *s, const char *name)
 465 {
 466         int len;
 467         char *rbuf, *wbuf;
 468
 469         if ((len = ustream_pending_data(s, false)) > 0)
 470         {
 471                 wbuf = blobmsg_alloc_string_buffer(&buf, name, len + 1);
 472
 473                 if (!wbuf)
 474                         return;
 475
 476                 ustream_for_each_read_buffer(s, rbuf, len)
 477                 {
 478                         memcpy(wbuf, rbuf, len);
 479                         wbuf += len;
 480                 }
 481
 482                 *wbuf = 0;
 483                 blobmsg_add_string_buffer(&buf);
 484         }
 485 }
 486
 487 static void
 488 rpc_file_exec_reply(struct rpc_file_exec_context *c, int rv)
 489 {
 490         uloop_timeout_cancel(&c->timeout);
 491         uloop_process_delete(&c->process);
 492
 493         if (rv == UBUS_STATUS_OK)
 494         {
 495                 blob_buf_init(&buf, 0);
 496
 497                 blobmsg_add_u32(&buf, "code", WEXITSTATUS(c->stat));
 498
 499                 rpc_ustream_to_blobmsg(&c->opipe.stream, "stdout");
 500                 rpc_ustream_to_blobmsg(&c->epipe.stream, "stderr");
 501
 502                 ubus_send_reply(c->context, &c->request, buf.head);
 503                 blob_buf_free(&buf);
 504         }
 505
 506         ubus_complete_deferred_request(c->context, &c->request, rv);
 507
 508         ustream_free(&c->opipe.stream);
 509         ustream_free(&c->epipe.stream);
 510
 511         close(c->opipe.fd.fd);
 512         close(c->epipe.fd.fd);
 513
 514         free(c);
 515 }
 516
 517 static void
 518 rpc_file_exec_timeout_cb(struct uloop_timeout *t)
 519 {
 520         struct rpc_file_exec_context *c =
 521                 container_of(t, struct rpc_file_exec_context, timeout);
 522
 523         kill(c->process.pid, SIGKILL);
 524         rpc_file_exec_reply(c, UBUS_STATUS_TIMEOUT);
 525 }
 526
 527 static void
 528 rpc_file_exec_process_cb(struct uloop_process *p, int stat)
 529 {
 530         struct rpc_file_exec_context *c =
 531                 container_of(p, struct rpc_file_exec_context, process);
 532
 533         c->stat = stat;
 534
 535         ustream_poll(&c->opipe.stream);
 536         ustream_poll(&c->epipe.stream);
 537 }
 538
 539 static void
 540 rpc_file_exec_opipe_read_cb(struct ustream *s, int bytes)
 541 {
 542         struct rpc_file_exec_context *c =
 543                 container_of(s, struct rpc_file_exec_context, opipe.stream);
 544
 545         if (ustream_read_buf_full(s))
 546                 rpc_file_exec_reply(c, UBUS_STATUS_NOT_SUPPORTED);
 547 }
 548
 549 static void
 550 rpc_file_exec_epipe_read_cb(struct ustream *s, int bytes)
 551 {
 552         struct rpc_file_exec_context *c =
 553                 container_of(s, struct rpc_file_exec_context, epipe.stream);
 554
 555         if (ustream_read_buf_full(s))
 556                 rpc_file_exec_reply(c, UBUS_STATUS_NOT_SUPPORTED);
 557 }
 558
 559 static void
 560 rpc_file_exec_opipe_state_cb(struct ustream *s)
 561 {
 562         struct rpc_file_exec_context *c =
 563                 container_of(s, struct rpc_file_exec_context, opipe.stream);
 564
 565         if (c->opipe.stream.eof && c->epipe.stream.eof)
 566                 rpc_file_exec_reply(c, UBUS_STATUS_OK);
 567 }
 568
 569 static void
 570 rpc_file_exec_epipe_state_cb(struct ustream *s)
 571 {
 572         struct rpc_file_exec_context *c =
 573                 container_of(s, struct rpc_file_exec_context, epipe.stream);
 574
 575         if (c->opipe.stream.eof && c->epipe.stream.eof)
 576                 rpc_file_exec_reply(c, UBUS_STATUS_OK);
 577 }
 578
 579 static int
 580 rpc_file_exec_run(const char *cmd,
 581                   const struct blob_attr *arg, const struct blob_attr *env,
 582                   struct ubus_context *ctx, struct ubus_request_data *req)
 583 {
 584         pid_t pid;
 585
 586         int opipe[2];
 587         int epipe[2];
 588
 589         int rem;
 590         struct blob_attr *cur;
 591
 592         char arglen;
 593         char **args;
 594
 595         struct rpc_file_exec_context *c;
 596
 597         cmd = rpc_file_exec_lookup(cmd);
 598
 599         if (!cmd)
 600                 return UBUS_STATUS_NOT_FOUND;
 601
 602         c = malloc(sizeof(*c));
 603
 604         if (!c)
 605                 return UBUS_STATUS_UNKNOWN_ERROR;
 606
 607         if (pipe(opipe) || pipe(epipe))
 608                 return rpc_errno_status();
 609
 610         switch ((pid = fork()))
 611         {
 612         case -1:
 613                 return rpc_errno_status();
 614
 615         case 0:
 616                 uloop_done();
 617
 618                 dup2(opipe[1], 1);
 619                 dup2(epipe[1], 2);
 620
 621                 close(0);
 622                 close(opipe[0]);
 623                 close(opipe[1]);
 624                 close(epipe[0]);
 625                 close(epipe[1]);
 626
 627                 arglen = 2;
 628                 args = malloc(sizeof(char *) * arglen);
 629
 630                 if (!args)
 631                         return UBUS_STATUS_UNKNOWN_ERROR;
 632
 633                 args[0] = (char *)cmd;
 634                 args[1] = NULL;
 635
 636                 if (arg)
 637                 {
 638                         blobmsg_for_each_attr(cur, arg, rem)
 639                         {
 640                                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 641                                         continue;
 642
 643                                 arglen++;
 644
 645                                 if (!(args = realloc(args, sizeof(char *) * arglen)))
 646                                         return UBUS_STATUS_UNKNOWN_ERROR;
 647
 648                                 args[arglen-2] = blobmsg_data(cur);
 649                                 args[arglen-1] = NULL;
 650                         }
 651                 }
 652
 653                 if (env)
 654                 {
 655                         blobmsg_for_each_attr(cur, env, rem)
 656                         {
 657                                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 658                                         continue;
 659
 660                                 setenv(blobmsg_name(cur), blobmsg_data(cur), 1);
 661                         }
 662                 }
 663
 664                 if (execv(cmd, args))
 665                         return rpc_errno_status();
 666
 667         default:
 668                 memset(c, 0, sizeof(*c));
 669
 670                 ustream_declare(c->opipe, opipe[0], exec_opipe);
 671                 ustream_declare(c->epipe, epipe[0], exec_epipe);
 672
 673                 c->process.pid = pid;
 674                 c->process.cb = rpc_file_exec_process_cb;
 675                 uloop_process_add(&c->process);
 676
 677                 c->timeout.cb = rpc_file_exec_timeout_cb;
 678                 uloop_timeout_set(&c->timeout, RPC_FILE_MAX_RUNTIME);
 679
 680                 close(opipe[1]);
 681                 close(epipe[1]);
 682
 683                 c->context = ctx;
 684                 ubus_defer_request(ctx, req, &c->request);
 685         }
 686
 687         return UBUS_STATUS_OK;
 688 }
 689
 690 static int
 691 rpc_file_exec(struct ubus_context *ctx, struct ubus_object *obj,
 692               struct ubus_request_data *req, const char *method,
 693               struct blob_attr *msg)
 694 {
 695         struct blob_attr *tb[__RPC_E_MAX];
 696
 697         blobmsg_parse(rpc_exec_policy, __RPC_E_MAX, tb,
 698                       blob_data(msg), blob_len(msg));
 699
 700         if (!tb[RPC_E_CMD])
 701                 return UBUS_STATUS_INVALID_ARGUMENT;
 702
 703         return rpc_file_exec_run(blobmsg_data(tb[RPC_E_CMD]),
 704                                               tb[RPC_E_PARM], tb[RPC_E_ENV], ctx, req);
 705 }
 706
 707
 708 static int
 709 rpc_file_api_init(const struct rpc_daemon_ops *o, struct ubus_context *ctx)
 710 {
 711         static const struct ubus_method file_methods[] = {
 712                 UBUS_METHOD("read",    rpc_file_read,  rpc_file_rb_policy),
 713                 UBUS_METHOD("write",   rpc_file_write, rpc_file_rw_policy),
 714                 UBUS_METHOD("list",    rpc_file_list,  rpc_file_r_policy),
 715                 UBUS_METHOD("stat",    rpc_file_stat,  rpc_file_r_policy),
 716                 UBUS_METHOD("md5",     rpc_file_md5,   rpc_file_r_policy),
 717                 UBUS_METHOD("exec",    rpc_file_exec,  rpc_exec_policy),
 718         };
 719
 720         static struct ubus_object_type file_type =
 721                 UBUS_OBJECT_TYPE("luci-rpc-file", file_methods);
 722
 723         static struct ubus_object obj = {
 724                 .name = "file",
 725                 .type = &file_type,
 726                 .methods = file_methods,
 727                 .n_methods = ARRAY_SIZE(file_methods),
 728         };
 729
 730         return ubus_add_object(ctx, &obj);
 731 }
 732
 733 struct rpc_plugin rpc_plugin = {
 734         .init = rpc_file_api_init
 735 };