file.c

   1 /*
   2  * rpcd - UBUS RPC server
   3  *
   4  *   Copyright (C) 2013-2014 Jo-Philipp Wich <jow@openwrt.org>
   5  *   Copyright (C) 2016 Luka Perkov <luka@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 <fcntl.h>
  21 #include <errno.h>
  22 #include <unistd.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <limits.h>
  26 #include <dirent.h>
  27 #include <sys/stat.h>
  28 #include <sys/wait.h>
  29 #include <libubus.h>
  30 #include <libubox/blobmsg.h>
  31 #include <libubox/md5.h>
  32 #include <libubox/ustream.h>
  33 #include <libubox/utils.h>
  34
  35 #include <rpcd/plugin.h>
  36
  37 /* limit of sys & proc files */
  38 #define RPC_FILE_MIN_SIZE               (128)
  39
  40 /* limit of regular files and command output data */
  41 #define RPC_FILE_MAX_SIZE               (4096 * 64)
  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_APPEND,
  97         RPC_F_RW_MODE,
  98         RPC_F_RW_BASE64,
  99         __RPC_F_RW_MAX,
 100 };
 101
 102 static const struct blobmsg_policy rpc_file_rw_policy[__RPC_F_RW_MAX] = {
 103         [RPC_F_RW_PATH]   = { .name = "path",   .type = BLOBMSG_TYPE_STRING },
 104         [RPC_F_RW_DATA]   = { .name = "data",   .type = BLOBMSG_TYPE_STRING },
 105         [RPC_F_RW_APPEND] = { .name = "append", .type = BLOBMSG_TYPE_BOOL  },
 106         [RPC_F_RW_MODE]   = { .name = "mode",   .type = BLOBMSG_TYPE_INT32  },
 107         [RPC_F_RW_BASE64] = { .name = "base64", .type = BLOBMSG_TYPE_BOOL   },
 108 };
 109
 110 enum {
 111         RPC_E_CMD,
 112         RPC_E_PARM,
 113         RPC_E_ENV,
 114         __RPC_E_MAX,
 115 };
 116
 117 static const struct blobmsg_policy rpc_exec_policy[__RPC_E_MAX] = {
 118         [RPC_E_CMD]  = { .name = "command", .type = BLOBMSG_TYPE_STRING },
 119         [RPC_E_PARM] = { .name = "params",  .type = BLOBMSG_TYPE_ARRAY  },
 120         [RPC_E_ENV]  = { .name = "env",     .type = BLOBMSG_TYPE_TABLE  },
 121 };
 122
 123 static const char *d_types[] = {
 124         [DT_BLK]     = "block",
 125         [DT_CHR]     = "char",
 126         [DT_DIR]     = "directory",
 127         [DT_FIFO]    = "fifo",
 128         [DT_LNK]     = "symlink",
 129         [DT_REG]     = "file",
 130         [DT_SOCK]    = "socket",
 131         [DT_UNKNOWN] = "unknown",
 132 };
 133
 134
 135 static int
 136 rpc_errno_status(void)
 137 {
 138         switch (errno)
 139         {
 140         case EACCES:
 141                 return UBUS_STATUS_PERMISSION_DENIED;
 142
 143         case ENOTDIR:
 144                 return UBUS_STATUS_INVALID_ARGUMENT;
 145
 146         case ENOENT:
 147                 return UBUS_STATUS_NOT_FOUND;
 148
 149         case EINVAL:
 150                 return UBUS_STATUS_INVALID_ARGUMENT;
 151
 152         default:
 153                 return UBUS_STATUS_UNKNOWN_ERROR;
 154         }
 155 }
 156
 157 static struct blob_attr **
 158 rpc_check_path(struct blob_attr *msg, char **path, struct stat *s)
 159 {
 160         static struct blob_attr *tb[__RPC_F_R_MAX];
 161
 162         blobmsg_parse(rpc_file_r_policy, __RPC_F_R_MAX, tb, blob_data(msg), blob_len(msg));
 163
 164         if (!tb[RPC_F_R_PATH])
 165         {
 166                 errno = EINVAL;
 167                 return NULL;
 168         }
 169
 170         *path = blobmsg_data(tb[RPC_F_R_PATH]);
 171
 172         if (stat(*path, s))
 173                 return NULL;
 174
 175         return tb;
 176 }
 177
 178 static int
 179 rpc_file_read(struct ubus_context *ctx, struct ubus_object *obj,
 180               struct ubus_request_data *req, const char *method,
 181               struct blob_attr *msg)
 182 {
 183         static struct blob_attr *tb[__RPC_F_RB_MAX];
 184         bool base64 = false;
 185         int fd, rv;
 186         ssize_t len;
 187         char *path;
 188         struct stat s;
 189         char *wbuf;
 190
 191         blobmsg_parse(rpc_file_rb_policy, __RPC_F_RB_MAX, tb, blob_data(msg), blob_len(msg));
 192
 193         if (!tb[RPC_F_RB_PATH])
 194                 return rpc_errno_status();
 195
 196         path = blobmsg_data(tb[RPC_F_RB_PATH]);
 197
 198         if (stat(path, &s))
 199                 return rpc_errno_status();
 200
 201         if (s.st_size >= RPC_FILE_MAX_SIZE)
 202                 return UBUS_STATUS_NOT_SUPPORTED;
 203
 204         if ((fd = open(path, O_RDONLY)) < 0)
 205                 return rpc_errno_status();
 206
 207         /* some sysfs files do not report a length */
 208         if (s.st_size == 0)
 209                 s.st_size = RPC_FILE_MIN_SIZE;
 210
 211         blob_buf_init(&buf, 0);
 212
 213         if (tb[RPC_F_RB_BASE64])
 214                 base64 = blobmsg_get_bool(tb[RPC_F_RB_BASE64]);
 215
 216         len = s.st_size + 1;
 217         if (base64)
 218                 len = B64_ENCODE_LEN(s.st_size);
 219         wbuf = blobmsg_alloc_string_buffer(&buf, "data", len);
 220
 221         if (!wbuf)
 222         {
 223                 rv = UBUS_STATUS_UNKNOWN_ERROR;
 224                 goto out;
 225         }
 226
 227         if ((len = read(fd, wbuf, s.st_size)) <= 0)
 228         {
 229                 rv = UBUS_STATUS_NO_DATA;
 230                 goto out;
 231         }
 232
 233         if (base64)
 234         {
 235                 uint8_t *data = calloc(len, sizeof(uint8_t));
 236                 if (!data)
 237                 {
 238                         rv = UBUS_STATUS_UNKNOWN_ERROR;
 239                         goto out;
 240                 }
 241                 memcpy(data, wbuf, len);
 242
 243                 len = b64_encode(data, len, wbuf, B64_ENCODE_LEN(len));
 244                 free(data);
 245                 if (len < 0)
 246                 {
 247                         rv = UBUS_STATUS_UNKNOWN_ERROR;
 248                         goto out;
 249                 }
 250         }
 251
 252         *(wbuf + len) = '\0';
 253         blobmsg_add_string_buffer(&buf);
 254
 255         ubus_send_reply(ctx, req, buf.head);
 256         rv = UBUS_STATUS_OK;
 257
 258 out:
 259         blob_buf_free(&buf);
 260         close(fd);
 261         return rv;
 262 }
 263
 264 static int
 265 rpc_file_write(struct ubus_context *ctx, struct ubus_object *obj,
 266                struct ubus_request_data *req, const char *method,
 267                struct blob_attr *msg)
 268 {
 269         struct blob_attr *tb[__RPC_F_RW_MAX];
 270         int append = O_TRUNC;
 271         mode_t prev_mode, mode = 0666;
 272         int fd, rv = 0;
 273         void *data = NULL;
 274         ssize_t data_len = 0;
 275
 276         blobmsg_parse(rpc_file_rw_policy, __RPC_F_RW_MAX, tb,
 277                       blob_data(msg), blob_len(msg));
 278
 279         if (!tb[RPC_F_RW_PATH] || !tb[RPC_F_RW_DATA])
 280                 return UBUS_STATUS_INVALID_ARGUMENT;
 281
 282         data = blobmsg_data(tb[RPC_F_RW_DATA]);
 283         data_len = blobmsg_data_len(tb[RPC_F_RW_DATA]) - 1;
 284
 285         if (tb[RPC_F_RW_APPEND] && blobmsg_get_bool(tb[RPC_F_RW_APPEND]))
 286                 append = O_APPEND;
 287
 288         if (tb[RPC_F_RW_MODE])
 289                 mode = blobmsg_get_u32(tb[RPC_F_RW_MODE]);
 290
 291         prev_mode = umask(0);
 292         fd = open(blobmsg_data(tb[RPC_F_RW_PATH]), O_CREAT | O_WRONLY | append, mode);
 293         umask(prev_mode);
 294         if (fd < 0)
 295                 return rpc_errno_status();
 296
 297         if (tb[RPC_F_RW_BASE64] && blobmsg_get_bool(tb[RPC_F_RW_BASE64]))
 298         {
 299                 data_len = b64_decode(data, data, data_len);
 300                 if (data_len < 0)
 301                 {
 302                         rv = UBUS_STATUS_UNKNOWN_ERROR;
 303                         goto out;
 304                 }
 305         }
 306
 307         if (write(fd, data, data_len) < 0)
 308                 rv = -1;
 309
 310 out:
 311         if (fsync(fd) < 0)
 312                 rv = -1;
 313
 314         close(fd);
 315         sync();
 316
 317         if (rv)
 318                 return rpc_errno_status();
 319
 320         return 0;
 321 }
 322
 323 static int
 324 rpc_file_md5(struct ubus_context *ctx, struct ubus_object *obj,
 325              struct ubus_request_data *req, const char *method,
 326              struct blob_attr *msg)
 327 {
 328         int rv, i;
 329         char *path;
 330         struct stat s;
 331         uint8_t md5[16];
 332         char *wbuf;
 333
 334         if (!rpc_check_path(msg, &path, &s))
 335                 return rpc_errno_status();
 336
 337         if (!S_ISREG(s.st_mode))
 338                 return UBUS_STATUS_NOT_SUPPORTED;
 339
 340         if ((rv = md5sum(path, md5)) <= 0)
 341                 return rpc_errno_status();
 342
 343         blob_buf_init(&buf, 0);
 344         wbuf = blobmsg_alloc_string_buffer(&buf, "md5", 33);
 345
 346         for (i = 0; i < 16; i++)
 347                 sprintf(wbuf + (i * 2), "%02x", (uint8_t) md5[i]);
 348
 349         blobmsg_add_string_buffer(&buf);
 350         ubus_send_reply(ctx, req, buf.head);
 351         blob_buf_free(&buf);
 352
 353         return UBUS_STATUS_OK;
 354 }
 355
 356 static int
 357 rpc_file_list(struct ubus_context *ctx, struct ubus_object *obj,
 358               struct ubus_request_data *req, const char *method,
 359               struct blob_attr *msg)
 360 {
 361         DIR *fd;
 362         void *c, *d;
 363         char *path;
 364         struct stat s;
 365         struct dirent *e;
 366
 367         if (!rpc_check_path(msg, &path, &s))
 368                 return rpc_errno_status();
 369
 370         if ((fd = opendir(path)) == NULL)
 371                 return rpc_errno_status();
 372
 373         blob_buf_init(&buf, 0);
 374         c = blobmsg_open_array(&buf, "entries");
 375
 376         while ((e = readdir(fd)) != NULL)
 377         {
 378                 if (!strcmp(e->d_name, ".") || !strcmp(e->d_name, ".."))
 379                         continue;
 380
 381                 d = blobmsg_open_table(&buf, NULL);
 382                 blobmsg_add_string(&buf, "name", e->d_name);
 383                 blobmsg_add_string(&buf, "type", d_types[e->d_type]);
 384                 blobmsg_close_table(&buf, d);
 385         }
 386
 387         closedir(fd);
 388
 389         blobmsg_close_array(&buf, c);
 390         ubus_send_reply(ctx, req, buf.head);
 391         blob_buf_free(&buf);
 392
 393         return 0;
 394 }
 395
 396 static int
 397 rpc_file_stat(struct ubus_context *ctx, struct ubus_object *obj,
 398               struct ubus_request_data *req, const char *method,
 399               struct blob_attr *msg)
 400 {
 401         int type;
 402         char *path;
 403         struct stat s;
 404
 405         if (!rpc_check_path(msg, &path, &s))
 406                 return rpc_errno_status();
 407
 408         blob_buf_init(&buf, 0);
 409
 410         type = S_ISREG(s.st_mode) ? DT_REG :
 411                 S_ISDIR(s.st_mode) ? DT_DIR :
 412                  S_ISCHR(s.st_mode) ? DT_CHR :
 413                   S_ISBLK(s.st_mode) ? DT_BLK :
 414                    S_ISFIFO(s.st_mode) ? DT_FIFO :
 415                     S_ISLNK(s.st_mode) ? DT_LNK :
 416                      S_ISSOCK(s.st_mode) ? DT_SOCK :
 417                       DT_UNKNOWN;
 418
 419         blobmsg_add_string(&buf, "path", path);
 420         blobmsg_add_string(&buf, "type", d_types[type]);
 421         blobmsg_add_u32(&buf, "size",  s.st_size);
 422         blobmsg_add_u32(&buf, "mode",  s.st_mode);
 423         blobmsg_add_u32(&buf, "atime", s.st_atime);
 424         blobmsg_add_u32(&buf, "mtime", s.st_mtime);
 425         blobmsg_add_u32(&buf, "ctime", s.st_ctime);
 426         blobmsg_add_u32(&buf, "inode", s.st_ino);
 427         blobmsg_add_u32(&buf, "uid",   s.st_uid);
 428         blobmsg_add_u32(&buf, "gid",   s.st_gid);
 429
 430         ubus_send_reply(ctx, req, buf.head);
 431         blob_buf_free(&buf);
 432
 433         return 0;
 434 }
 435
 436 static const char *
 437 rpc_file_exec_lookup(const char *cmd)
 438 {
 439         struct stat s;
 440         int plen = 0, clen = strlen(cmd) + 1;
 441         char *search, *p;
 442         static char path[PATH_MAX];
 443
 444         if (!stat(cmd, &s) && S_ISREG(s.st_mode))
 445                 return cmd;
 446
 447         search = getenv("PATH");
 448
 449         if (!search)
 450                 search = "/bin:/usr/bin:/sbin:/usr/sbin";
 451
 452         p = search;
 453
 454         do
 455         {
 456                 if (*p != ':' && *p != '\0')
 457                         continue;
 458
 459                 plen = p - search;
 460
 461                 if ((plen + clen) >= sizeof(path))
 462                         continue;
 463
 464                 strncpy(path, search, plen);
 465                 sprintf(path + plen, "/%s", cmd);
 466
 467                 if (!stat(path, &s) && S_ISREG(s.st_mode))
 468                         return path;
 469
 470                 search = p + 1;
 471         }
 472         while (*p++);
 473
 474         return NULL;
 475 }
 476
 477
 478 static void
 479 rpc_ustream_to_blobmsg(struct ustream *s, const char *name)
 480 {
 481         int len;
 482         char *rbuf, *wbuf;
 483
 484         if ((len = ustream_pending_data(s, false)) > 0)
 485         {
 486                 wbuf = blobmsg_alloc_string_buffer(&buf, name, len + 1);
 487
 488                 if (!wbuf)
 489                         return;
 490
 491                 ustream_for_each_read_buffer(s, rbuf, len)
 492                 {
 493                         memcpy(wbuf, rbuf, len);
 494                         wbuf += len;
 495                 }
 496
 497                 *wbuf = 0;
 498                 blobmsg_add_string_buffer(&buf);
 499         }
 500 }
 501
 502 static void
 503 rpc_file_exec_reply(struct rpc_file_exec_context *c, int rv)
 504 {
 505         uloop_timeout_cancel(&c->timeout);
 506         uloop_process_delete(&c->process);
 507
 508         if (rv == UBUS_STATUS_OK)
 509         {
 510                 blob_buf_init(&buf, 0);
 511
 512                 blobmsg_add_u32(&buf, "code", WEXITSTATUS(c->stat));
 513
 514                 rpc_ustream_to_blobmsg(&c->opipe.stream, "stdout");
 515                 rpc_ustream_to_blobmsg(&c->epipe.stream, "stderr");
 516
 517                 ubus_send_reply(c->context, &c->request, buf.head);
 518                 blob_buf_free(&buf);
 519         }
 520
 521         ubus_complete_deferred_request(c->context, &c->request, rv);
 522
 523         ustream_free(&c->opipe.stream);
 524         ustream_free(&c->epipe.stream);
 525
 526         close(c->opipe.fd.fd);
 527         close(c->epipe.fd.fd);
 528
 529         free(c);
 530 }
 531
 532 static void
 533 rpc_file_exec_timeout_cb(struct uloop_timeout *t)
 534 {
 535         struct rpc_file_exec_context *c =
 536                 container_of(t, struct rpc_file_exec_context, timeout);
 537
 538         kill(c->process.pid, SIGKILL);
 539         rpc_file_exec_reply(c, UBUS_STATUS_TIMEOUT);
 540 }
 541
 542 static void
 543 rpc_file_exec_process_cb(struct uloop_process *p, int stat)
 544 {
 545         struct rpc_file_exec_context *c =
 546                 container_of(p, struct rpc_file_exec_context, process);
 547
 548         c->stat = stat;
 549
 550         ustream_poll(&c->opipe.stream);
 551         ustream_poll(&c->epipe.stream);
 552 }
 553
 554 static void
 555 rpc_file_exec_opipe_read_cb(struct ustream *s, int bytes)
 556 {
 557         struct rpc_file_exec_context *c =
 558                 container_of(s, struct rpc_file_exec_context, opipe.stream);
 559
 560         if (ustream_read_buf_full(s))
 561                 rpc_file_exec_reply(c, UBUS_STATUS_NOT_SUPPORTED);
 562 }
 563
 564 static void
 565 rpc_file_exec_epipe_read_cb(struct ustream *s, int bytes)
 566 {
 567         struct rpc_file_exec_context *c =
 568                 container_of(s, struct rpc_file_exec_context, epipe.stream);
 569
 570         if (ustream_read_buf_full(s))
 571                 rpc_file_exec_reply(c, UBUS_STATUS_NOT_SUPPORTED);
 572 }
 573
 574 static void
 575 rpc_file_exec_opipe_state_cb(struct ustream *s)
 576 {
 577         struct rpc_file_exec_context *c =
 578                 container_of(s, struct rpc_file_exec_context, opipe.stream);
 579
 580         if (c->opipe.stream.eof && c->epipe.stream.eof)
 581                 rpc_file_exec_reply(c, UBUS_STATUS_OK);
 582 }
 583
 584 static void
 585 rpc_file_exec_epipe_state_cb(struct ustream *s)
 586 {
 587         struct rpc_file_exec_context *c =
 588                 container_of(s, struct rpc_file_exec_context, epipe.stream);
 589
 590         if (c->opipe.stream.eof && c->epipe.stream.eof)
 591                 rpc_file_exec_reply(c, UBUS_STATUS_OK);
 592 }
 593
 594 static int
 595 rpc_file_exec_run(const char *cmd,
 596                   const struct blob_attr *arg, const struct blob_attr *env,
 597                   struct ubus_context *ctx, struct ubus_request_data *req)
 598 {
 599         pid_t pid;
 600
 601         int opipe[2];
 602         int epipe[2];
 603
 604         int rem;
 605         struct blob_attr *cur;
 606
 607         char arglen;
 608         char **args;
 609
 610         struct rpc_file_exec_context *c;
 611
 612         cmd = rpc_file_exec_lookup(cmd);
 613
 614         if (!cmd)
 615                 return UBUS_STATUS_NOT_FOUND;
 616
 617         c = malloc(sizeof(*c));
 618
 619         if (!c)
 620                 return UBUS_STATUS_UNKNOWN_ERROR;
 621
 622         if (pipe(opipe) || pipe(epipe))
 623                 return rpc_errno_status();
 624
 625         switch ((pid = fork()))
 626         {
 627         case -1:
 628                 return rpc_errno_status();
 629
 630         case 0:
 631                 uloop_done();
 632
 633                 dup2(opipe[1], 1);
 634                 dup2(epipe[1], 2);
 635
 636                 close(0);
 637                 close(opipe[0]);
 638                 close(opipe[1]);
 639                 close(epipe[0]);
 640                 close(epipe[1]);
 641
 642                 arglen = 2;
 643                 args = malloc(sizeof(char *) * arglen);
 644
 645                 if (!args)
 646                         return UBUS_STATUS_UNKNOWN_ERROR;
 647
 648                 args[0] = (char *)cmd;
 649                 args[1] = NULL;
 650
 651                 if (arg)
 652                 {
 653                         blobmsg_for_each_attr(cur, arg, rem)
 654                         {
 655                                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 656                                         continue;
 657
 658                                 arglen++;
 659
 660                                 if (!(args = realloc(args, sizeof(char *) * arglen)))
 661                                         return UBUS_STATUS_UNKNOWN_ERROR;
 662
 663                                 args[arglen-2] = blobmsg_data(cur);
 664                                 args[arglen-1] = NULL;
 665                         }
 666                 }
 667
 668                 if (env)
 669                 {
 670                         blobmsg_for_each_attr(cur, env, rem)
 671                         {
 672                                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 673                                         continue;
 674
 675                                 setenv(blobmsg_name(cur), blobmsg_data(cur), 1);
 676                         }
 677                 }
 678
 679                 if (execv(cmd, args))
 680                         return rpc_errno_status();
 681
 682         default:
 683                 memset(c, 0, sizeof(*c));
 684
 685                 ustream_declare(c->opipe, opipe[0], exec_opipe);
 686                 ustream_declare(c->epipe, epipe[0], exec_epipe);
 687
 688                 c->process.pid = pid;
 689                 c->process.cb = rpc_file_exec_process_cb;
 690                 uloop_process_add(&c->process);
 691
 692                 c->timeout.cb = rpc_file_exec_timeout_cb;
 693                 uloop_timeout_set(&c->timeout, exec_timeout);
 694
 695                 close(opipe[1]);
 696                 close(epipe[1]);
 697
 698                 c->context = ctx;
 699                 ubus_defer_request(ctx, req, &c->request);
 700         }
 701
 702         return UBUS_STATUS_OK;
 703 }
 704
 705 static int
 706 rpc_file_exec(struct ubus_context *ctx, struct ubus_object *obj,
 707               struct ubus_request_data *req, const char *method,
 708               struct blob_attr *msg)
 709 {
 710         struct blob_attr *tb[__RPC_E_MAX];
 711
 712         blobmsg_parse(rpc_exec_policy, __RPC_E_MAX, tb,
 713                       blob_data(msg), blob_len(msg));
 714
 715         if (!tb[RPC_E_CMD])
 716                 return UBUS_STATUS_INVALID_ARGUMENT;
 717
 718         return rpc_file_exec_run(blobmsg_data(tb[RPC_E_CMD]),
 719                                               tb[RPC_E_PARM], tb[RPC_E_ENV], ctx, req);
 720 }
 721
 722
 723 static int
 724 rpc_file_api_init(const struct rpc_daemon_ops *o, struct ubus_context *ctx)
 725 {
 726         static const struct ubus_method file_methods[] = {
 727                 UBUS_METHOD("read",    rpc_file_read,  rpc_file_rb_policy),
 728                 UBUS_METHOD("write",   rpc_file_write, rpc_file_rw_policy),
 729                 UBUS_METHOD("list",    rpc_file_list,  rpc_file_r_policy),
 730                 UBUS_METHOD("stat",    rpc_file_stat,  rpc_file_r_policy),
 731                 UBUS_METHOD("md5",     rpc_file_md5,   rpc_file_r_policy),
 732                 UBUS_METHOD("exec",    rpc_file_exec,  rpc_exec_policy),
 733         };
 734
 735         static struct ubus_object_type file_type =
 736                 UBUS_OBJECT_TYPE("luci-rpc-file", file_methods);
 737
 738         static struct ubus_object obj = {
 739                 .name = "file",
 740                 .type = &file_type,
 741                 .methods = file_methods,
 742                 .n_methods = ARRAY_SIZE(file_methods),
 743         };
 744
 745         return ubus_add_object(ctx, &obj);
 746 }
 747
 748 struct rpc_plugin rpc_plugin = {
 749         .init = rpc_file_api_init
 750 };