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 #define RPC_FILE_MAX_RUNTIME    (3 * 1000)
  43
  44 #define ustream_for_each_read_buffer(stream, ptr, len) \
  45         for (ptr = ustream_get_read_buf(stream, &len);     \
  46              ptr != NULL && len > 0;                       \
  47              ustream_consume(stream, len), ptr = ustream_get_read_buf(stream, &len))
  48
  49 #define ustream_declare(us, fd, name)                     \
  50         us.stream.string_data   = true;                       \
  51         us.stream.r.buffer_len  = 4096;                       \
  52         us.stream.r.max_buffers = RPC_FILE_MAX_SIZE / 4096;   \
  53         us.stream.notify_read   = rpc_file_##name##_read_cb;  \
  54         us.stream.notify_state  = rpc_file_##name##_state_cb; \
  55         ustream_fd_init(&us, fd);
  56
  57 struct rpc_file_exec_context {
  58         struct ubus_context *context;
  59         struct ubus_request_data request;
  60         struct uloop_timeout timeout;
  61         struct uloop_process process;
  62         struct ustream_fd opipe;
  63         struct ustream_fd epipe;
  64         int outlen;
  65         char *out;
  66         int errlen;
  67         char *err;
  68         int stat;
  69 };
  70
  71
  72 static struct blob_buf buf;
  73
  74 enum {
  75         RPC_F_R_PATH,
  76         __RPC_F_R_MAX,
  77 };
  78
  79 static const struct blobmsg_policy rpc_file_r_policy[__RPC_F_R_MAX] = {
  80         [RPC_F_R_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
  81 };
  82
  83 enum {
  84         RPC_F_RB_PATH,
  85         RPC_F_RB_BASE64,
  86         __RPC_F_RB_MAX,
  87 };
  88
  89 static const struct blobmsg_policy rpc_file_rb_policy[__RPC_F_RB_MAX] = {
  90         [RPC_F_RB_PATH]   = { .name = "path",   .type = BLOBMSG_TYPE_STRING },
  91         [RPC_F_RB_BASE64] = { .name = "base64", .type = BLOBMSG_TYPE_BOOL   },
  92 };
  93
  94 enum {
  95         RPC_F_RW_PATH,
  96         RPC_F_RW_DATA,
  97         RPC_F_RW_APPEND,
  98         RPC_F_RW_MODE,
  99         RPC_F_RW_BASE64,
 100         __RPC_F_RW_MAX,
 101 };
 102
 103 static const struct blobmsg_policy rpc_file_rw_policy[__RPC_F_RW_MAX] = {
 104         [RPC_F_RW_PATH]   = { .name = "path",   .type = BLOBMSG_TYPE_STRING },
 105         [RPC_F_RW_DATA]   = { .name = "data",   .type = BLOBMSG_TYPE_STRING },
 106         [RPC_F_RW_APPEND] = { .name = "append", .type = BLOBMSG_TYPE_BOOL  },
 107         [RPC_F_RW_MODE]   = { .name = "mode",   .type = BLOBMSG_TYPE_INT32  },
 108         [RPC_F_RW_BASE64] = { .name = "base64", .type = BLOBMSG_TYPE_BOOL   },
 109 };
 110
 111 enum {
 112         RPC_E_CMD,
 113         RPC_E_PARM,
 114         RPC_E_ENV,
 115         __RPC_E_MAX,
 116 };
 117
 118 static const struct blobmsg_policy rpc_exec_policy[__RPC_E_MAX] = {
 119         [RPC_E_CMD]  = { .name = "command", .type = BLOBMSG_TYPE_STRING },
 120         [RPC_E_PARM] = { .name = "params",  .type = BLOBMSG_TYPE_ARRAY  },
 121         [RPC_E_ENV]  = { .name = "env",     .type = BLOBMSG_TYPE_TABLE  },
 122 };
 123
 124 static const char *d_types[] = {
 125         [DT_BLK]     = "block",
 126         [DT_CHR]     = "char",
 127         [DT_DIR]     = "directory",
 128         [DT_FIFO]    = "fifo",
 129         [DT_LNK]     = "symlink",
 130         [DT_REG]     = "file",
 131         [DT_SOCK]    = "socket",
 132         [DT_UNKNOWN] = "unknown",
 133 };
 134
 135
 136 static int
 137 rpc_errno_status(void)
 138 {
 139         switch (errno)
 140         {
 141         case EACCES:
 142                 return UBUS_STATUS_PERMISSION_DENIED;
 143
 144         case ENOTDIR:
 145                 return UBUS_STATUS_INVALID_ARGUMENT;
 146
 147         case ENOENT:
 148                 return UBUS_STATUS_NOT_FOUND;
 149
 150         case EINVAL:
 151                 return UBUS_STATUS_INVALID_ARGUMENT;
 152
 153         default:
 154                 return UBUS_STATUS_UNKNOWN_ERROR;
 155         }
 156 }
 157
 158 static struct blob_attr **
 159 rpc_check_path(struct blob_attr *msg, char **path, struct stat *s)
 160 {
 161         static struct blob_attr *tb[__RPC_F_R_MAX];
 162
 163         blobmsg_parse(rpc_file_r_policy, __RPC_F_R_MAX, tb, blob_data(msg), blob_len(msg));
 164
 165         if (!tb[RPC_F_R_PATH])
 166         {
 167                 errno = EINVAL;
 168                 return NULL;
 169         }
 170
 171         *path = blobmsg_data(tb[RPC_F_R_PATH]);
 172
 173         if (stat(*path, s))
 174                 return NULL;
 175
 176         return tb;
 177 }
 178
 179 static int
 180 rpc_file_read(struct ubus_context *ctx, struct ubus_object *obj,
 181               struct ubus_request_data *req, const char *method,
 182               struct blob_attr *msg)
 183 {
 184         static struct blob_attr *tb[__RPC_F_RB_MAX];
 185         bool base64 = false;
 186         int fd, rv;
 187         ssize_t len;
 188         char *path;
 189         struct stat s;
 190         char *wbuf;
 191
 192         blobmsg_parse(rpc_file_rb_policy, __RPC_F_RB_MAX, tb, blob_data(msg), blob_len(msg));
 193
 194         if (!tb[RPC_F_RB_PATH])
 195                 return rpc_errno_status();
 196
 197         path = blobmsg_data(tb[RPC_F_RB_PATH]);
 198
 199         if (stat(path, &s))
 200                 return rpc_errno_status();
 201
 202         if (s.st_size >= RPC_FILE_MAX_SIZE)
 203                 return UBUS_STATUS_NOT_SUPPORTED;
 204
 205         if ((fd = open(path, O_RDONLY)) < 0)
 206                 return rpc_errno_status();
 207
 208         /* some sysfs files do not report a length */
 209         if (s.st_size == 0)
 210                 s.st_size = RPC_FILE_MIN_SIZE;
 211
 212         blob_buf_init(&buf, 0);
 213
 214         if (tb[RPC_F_RB_BASE64])
 215                 base64 = blobmsg_get_bool(tb[RPC_F_RB_BASE64]);
 216
 217         len = s.st_size + 1;
 218         if (base64)
 219                 len = B64_ENCODE_LEN(s.st_size);
 220         wbuf = blobmsg_alloc_string_buffer(&buf, "data", len);
 221
 222         if (!wbuf)
 223         {
 224                 rv = UBUS_STATUS_UNKNOWN_ERROR;
 225                 goto out;
 226         }
 227
 228         if ((len = read(fd, wbuf, s.st_size)) <= 0)
 229         {
 230                 rv = UBUS_STATUS_NO_DATA;
 231                 goto out;
 232         }
 233
 234         if (base64)
 235         {
 236                 uint8_t *data = calloc(len, sizeof(uint8_t));
 237                 if (!data)
 238                 {
 239                         rv = UBUS_STATUS_UNKNOWN_ERROR;
 240                         goto out;
 241                 }
 242                 memcpy(data, wbuf, len);
 243
 244                 len = b64_encode(data, len, wbuf, B64_ENCODE_LEN(len));
 245                 free(data);
 246                 if (len < 0)
 247                 {
 248                         rv = UBUS_STATUS_UNKNOWN_ERROR;
 249                         goto out;
 250                 }
 251         }
 252
 253         *(wbuf + len) = '\0';
 254         blobmsg_add_string_buffer(&buf);
 255
 256         ubus_send_reply(ctx, req, buf.head);
 257         rv = UBUS_STATUS_OK;
 258
 259 out:
 260         blob_buf_free(&buf);
 261         close(fd);
 262         return rv;
 263 }
 264
 265 static int
 266 rpc_file_write(struct ubus_context *ctx, struct ubus_object *obj,
 267                struct ubus_request_data *req, const char *method,
 268                struct blob_attr *msg)
 269 {
 270         struct blob_attr *tb[__RPC_F_RW_MAX];
 271         int append = O_TRUNC;
 272         mode_t prev_mode, mode = 0666;
 273         int fd, rv = 0;
 274         void *data = NULL;
 275         ssize_t data_len = 0;
 276
 277         blobmsg_parse(rpc_file_rw_policy, __RPC_F_RW_MAX, tb,
 278                       blob_data(msg), blob_len(msg));
 279
 280         if (!tb[RPC_F_RW_PATH] || !tb[RPC_F_RW_DATA])
 281                 return UBUS_STATUS_INVALID_ARGUMENT;
 282
 283         data = blobmsg_data(tb[RPC_F_RW_DATA]);
 284         data_len = blobmsg_data_len(tb[RPC_F_RW_DATA]) - 1;
 285
 286         if (tb[RPC_F_RW_APPEND] && blobmsg_get_bool(tb[RPC_F_RW_APPEND]))
 287                 append = O_APPEND;
 288
 289         if (tb[RPC_F_RW_MODE])
 290                 mode = blobmsg_get_u32(tb[RPC_F_RW_MODE]);
 291
 292         prev_mode = umask(0);
 293         fd = open(blobmsg_data(tb[RPC_F_RW_PATH]), O_CREAT | O_WRONLY | append, mode);
 294         umask(prev_mode);
 295         if (fd < 0)
 296                 return rpc_errno_status();
 297
 298         if (tb[RPC_F_RW_BASE64] && blobmsg_get_bool(tb[RPC_F_RW_BASE64]))
 299         {
 300                 data_len = b64_decode(data, data, data_len);
 301                 if (data_len < 0)
 302                 {
 303                         rv = UBUS_STATUS_UNKNOWN_ERROR;
 304                         goto out;
 305                 }
 306         }
 307
 308         if (write(fd, data, data_len) < 0)
 309                 rv = -1;
 310
 311 out:
 312         if (fsync(fd) < 0)
 313                 rv = -1;
 314
 315         close(fd);
 316         sync();
 317
 318         if (rv)
 319                 return rpc_errno_status();
 320
 321         return 0;
 322 }
 323
 324 static int
 325 rpc_file_md5(struct ubus_context *ctx, struct ubus_object *obj,
 326              struct ubus_request_data *req, const char *method,
 327              struct blob_attr *msg)
 328 {
 329         int rv, i;
 330         char *path;
 331         struct stat s;
 332         uint8_t md5[16];
 333         char *wbuf;
 334
 335         if (!rpc_check_path(msg, &path, &s))
 336                 return rpc_errno_status();
 337
 338         if (!S_ISREG(s.st_mode))
 339                 return UBUS_STATUS_NOT_SUPPORTED;
 340
 341         if ((rv = md5sum(path, md5)) <= 0)
 342                 return rpc_errno_status();
 343
 344         blob_buf_init(&buf, 0);
 345         wbuf = blobmsg_alloc_string_buffer(&buf, "md5", 33);
 346
 347         for (i = 0; i < 16; i++)
 348                 sprintf(wbuf + (i * 2), "%02x", (uint8_t) md5[i]);
 349
 350         blobmsg_add_string_buffer(&buf);
 351         ubus_send_reply(ctx, req, buf.head);
 352         blob_buf_free(&buf);
 353
 354         return UBUS_STATUS_OK;
 355 }
 356
 357 static int
 358 rpc_file_list(struct ubus_context *ctx, struct ubus_object *obj,
 359               struct ubus_request_data *req, const char *method,
 360               struct blob_attr *msg)
 361 {
 362         DIR *fd;
 363         void *c, *d;
 364         char *path;
 365         struct stat s;
 366         struct dirent *e;
 367
 368         if (!rpc_check_path(msg, &path, &s))
 369                 return rpc_errno_status();
 370
 371         if ((fd = opendir(path)) == NULL)
 372                 return rpc_errno_status();
 373
 374         blob_buf_init(&buf, 0);
 375         c = blobmsg_open_array(&buf, "entries");
 376
 377         while ((e = readdir(fd)) != NULL)
 378         {
 379                 if (!strcmp(e->d_name, ".") || !strcmp(e->d_name, ".."))
 380                         continue;
 381
 382                 d = blobmsg_open_table(&buf, NULL);
 383                 blobmsg_add_string(&buf, "name", e->d_name);
 384                 blobmsg_add_string(&buf, "type", d_types[e->d_type]);
 385                 blobmsg_close_table(&buf, d);
 386         }
 387
 388         closedir(fd);
 389
 390         blobmsg_close_array(&buf, c);
 391         ubus_send_reply(ctx, req, buf.head);
 392         blob_buf_free(&buf);
 393
 394         return 0;
 395 }
 396
 397 static int
 398 rpc_file_stat(struct ubus_context *ctx, struct ubus_object *obj,
 399               struct ubus_request_data *req, const char *method,
 400               struct blob_attr *msg)
 401 {
 402         int type;
 403         char *path;
 404         struct stat s;
 405
 406         if (!rpc_check_path(msg, &path, &s))
 407                 return rpc_errno_status();
 408
 409         blob_buf_init(&buf, 0);
 410
 411         type = S_ISREG(s.st_mode) ? DT_REG :
 412                 S_ISDIR(s.st_mode) ? DT_DIR :
 413                  S_ISCHR(s.st_mode) ? DT_CHR :
 414                   S_ISBLK(s.st_mode) ? DT_BLK :
 415                    S_ISFIFO(s.st_mode) ? DT_FIFO :
 416                     S_ISLNK(s.st_mode) ? DT_LNK :
 417                      S_ISSOCK(s.st_mode) ? DT_SOCK :
 418                       DT_UNKNOWN;
 419
 420         blobmsg_add_string(&buf, "path", path);
 421         blobmsg_add_string(&buf, "type", d_types[type]);
 422         blobmsg_add_u32(&buf, "size",  s.st_size);
 423         blobmsg_add_u32(&buf, "mode",  s.st_mode);
 424         blobmsg_add_u32(&buf, "atime", s.st_atime);
 425         blobmsg_add_u32(&buf, "mtime", s.st_mtime);
 426         blobmsg_add_u32(&buf, "ctime", s.st_ctime);
 427         blobmsg_add_u32(&buf, "inode", s.st_ino);
 428         blobmsg_add_u32(&buf, "uid",   s.st_uid);
 429         blobmsg_add_u32(&buf, "gid",   s.st_gid);
 430
 431         ubus_send_reply(ctx, req, buf.head);
 432         blob_buf_free(&buf);
 433
 434         return 0;
 435 }
 436
 437 static const char *
 438 rpc_file_exec_lookup(const char *cmd)
 439 {
 440         struct stat s;
 441         int plen = 0, clen = strlen(cmd) + 1;
 442         char *search, *p;
 443         static char path[PATH_MAX];
 444
 445         if (!stat(cmd, &s) && S_ISREG(s.st_mode))
 446                 return cmd;
 447
 448         search = getenv("PATH");
 449
 450         if (!search)
 451                 search = "/bin:/usr/bin:/sbin:/usr/sbin";
 452
 453         p = search;
 454
 455         do
 456         {
 457                 if (*p != ':' && *p != '\0')
 458                         continue;
 459
 460                 plen = p - search;
 461
 462                 if ((plen + clen) >= sizeof(path))
 463                         continue;
 464
 465                 strncpy(path, search, plen);
 466                 sprintf(path + plen, "/%s", cmd);
 467
 468                 if (!stat(path, &s) && S_ISREG(s.st_mode))
 469                         return path;
 470
 471                 search = p + 1;
 472         }
 473         while (*p++);
 474
 475         return NULL;
 476 }
 477
 478
 479 static void
 480 rpc_ustream_to_blobmsg(struct ustream *s, const char *name)
 481 {
 482         int len;
 483         char *rbuf, *wbuf;
 484
 485         if ((len = ustream_pending_data(s, false)) > 0)
 486         {
 487                 wbuf = blobmsg_alloc_string_buffer(&buf, name, len + 1);
 488
 489                 if (!wbuf)
 490                         return;
 491
 492                 ustream_for_each_read_buffer(s, rbuf, len)
 493                 {
 494                         memcpy(wbuf, rbuf, len);
 495                         wbuf += len;
 496                 }
 497
 498                 *wbuf = 0;
 499                 blobmsg_add_string_buffer(&buf);
 500         }
 501 }
 502
 503 static void
 504 rpc_file_exec_reply(struct rpc_file_exec_context *c, int rv)
 505 {
 506         uloop_timeout_cancel(&c->timeout);
 507         uloop_process_delete(&c->process);
 508
 509         if (rv == UBUS_STATUS_OK)
 510         {
 511                 blob_buf_init(&buf, 0);
 512
 513                 blobmsg_add_u32(&buf, "code", WEXITSTATUS(c->stat));
 514
 515                 rpc_ustream_to_blobmsg(&c->opipe.stream, "stdout");
 516                 rpc_ustream_to_blobmsg(&c->epipe.stream, "stderr");
 517
 518                 ubus_send_reply(c->context, &c->request, buf.head);
 519                 blob_buf_free(&buf);
 520         }
 521
 522         ubus_complete_deferred_request(c->context, &c->request, rv);
 523
 524         ustream_free(&c->opipe.stream);
 525         ustream_free(&c->epipe.stream);
 526
 527         close(c->opipe.fd.fd);
 528         close(c->epipe.fd.fd);
 529
 530         free(c);
 531 }
 532
 533 static void
 534 rpc_file_exec_timeout_cb(struct uloop_timeout *t)
 535 {
 536         struct rpc_file_exec_context *c =
 537                 container_of(t, struct rpc_file_exec_context, timeout);
 538
 539         kill(c->process.pid, SIGKILL);
 540         rpc_file_exec_reply(c, UBUS_STATUS_TIMEOUT);
 541 }
 542
 543 static void
 544 rpc_file_exec_process_cb(struct uloop_process *p, int stat)
 545 {
 546         struct rpc_file_exec_context *c =
 547                 container_of(p, struct rpc_file_exec_context, process);
 548
 549         c->stat = stat;
 550
 551         ustream_poll(&c->opipe.stream);
 552         ustream_poll(&c->epipe.stream);
 553 }
 554
 555 static void
 556 rpc_file_exec_opipe_read_cb(struct ustream *s, int bytes)
 557 {
 558         struct rpc_file_exec_context *c =
 559                 container_of(s, struct rpc_file_exec_context, opipe.stream);
 560
 561         if (ustream_read_buf_full(s))
 562                 rpc_file_exec_reply(c, UBUS_STATUS_NOT_SUPPORTED);
 563 }
 564
 565 static void
 566 rpc_file_exec_epipe_read_cb(struct ustream *s, int bytes)
 567 {
 568         struct rpc_file_exec_context *c =
 569                 container_of(s, struct rpc_file_exec_context, epipe.stream);
 570
 571         if (ustream_read_buf_full(s))
 572                 rpc_file_exec_reply(c, UBUS_STATUS_NOT_SUPPORTED);
 573 }
 574
 575 static void
 576 rpc_file_exec_opipe_state_cb(struct ustream *s)
 577 {
 578         struct rpc_file_exec_context *c =
 579                 container_of(s, struct rpc_file_exec_context, opipe.stream);
 580
 581         if (c->opipe.stream.eof && c->epipe.stream.eof)
 582                 rpc_file_exec_reply(c, UBUS_STATUS_OK);
 583 }
 584
 585 static void
 586 rpc_file_exec_epipe_state_cb(struct ustream *s)
 587 {
 588         struct rpc_file_exec_context *c =
 589                 container_of(s, struct rpc_file_exec_context, epipe.stream);
 590
 591         if (c->opipe.stream.eof && c->epipe.stream.eof)
 592                 rpc_file_exec_reply(c, UBUS_STATUS_OK);
 593 }
 594
 595 static int
 596 rpc_file_exec_run(const char *cmd,
 597                   const struct blob_attr *arg, const struct blob_attr *env,
 598                   struct ubus_context *ctx, struct ubus_request_data *req)
 599 {
 600         pid_t pid;
 601
 602         int opipe[2];
 603         int epipe[2];
 604
 605         int rem;
 606         struct blob_attr *cur;
 607
 608         char arglen;
 609         char **args;
 610
 611         struct rpc_file_exec_context *c;
 612
 613         cmd = rpc_file_exec_lookup(cmd);
 614
 615         if (!cmd)
 616                 return UBUS_STATUS_NOT_FOUND;
 617
 618         c = malloc(sizeof(*c));
 619
 620         if (!c)
 621                 return UBUS_STATUS_UNKNOWN_ERROR;
 622
 623         if (pipe(opipe) || pipe(epipe))
 624                 return rpc_errno_status();
 625
 626         switch ((pid = fork()))
 627         {
 628         case -1:
 629                 return rpc_errno_status();
 630
 631         case 0:
 632                 uloop_done();
 633
 634                 dup2(opipe[1], 1);
 635                 dup2(epipe[1], 2);
 636
 637                 close(0);
 638                 close(opipe[0]);
 639                 close(opipe[1]);
 640                 close(epipe[0]);
 641                 close(epipe[1]);
 642
 643                 arglen = 2;
 644                 args = malloc(sizeof(char *) * arglen);
 645
 646                 if (!args)
 647                         return UBUS_STATUS_UNKNOWN_ERROR;
 648
 649                 args[0] = (char *)cmd;
 650                 args[1] = NULL;
 651
 652                 if (arg)
 653                 {
 654                         blobmsg_for_each_attr(cur, arg, rem)
 655                         {
 656                                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 657                                         continue;
 658
 659                                 arglen++;
 660
 661                                 if (!(args = realloc(args, sizeof(char *) * arglen)))
 662                                         return UBUS_STATUS_UNKNOWN_ERROR;
 663
 664                                 args[arglen-2] = blobmsg_data(cur);
 665                                 args[arglen-1] = NULL;
 666                         }
 667                 }
 668
 669                 if (env)
 670                 {
 671                         blobmsg_for_each_attr(cur, env, rem)
 672                         {
 673                                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 674                                         continue;
 675
 676                                 setenv(blobmsg_name(cur), blobmsg_data(cur), 1);
 677                         }
 678                 }
 679
 680                 if (execv(cmd, args))
 681                         return rpc_errno_status();
 682
 683         default:
 684                 memset(c, 0, sizeof(*c));
 685
 686                 ustream_declare(c->opipe, opipe[0], exec_opipe);
 687                 ustream_declare(c->epipe, epipe[0], exec_epipe);
 688
 689                 c->process.pid = pid;
 690                 c->process.cb = rpc_file_exec_process_cb;
 691                 uloop_process_add(&c->process);
 692
 693                 c->timeout.cb = rpc_file_exec_timeout_cb;
 694                 uloop_timeout_set(&c->timeout, RPC_FILE_MAX_RUNTIME);
 695
 696                 close(opipe[1]);
 697                 close(epipe[1]);
 698
 699                 c->context = ctx;
 700                 ubus_defer_request(ctx, req, &c->request);
 701         }
 702
 703         return UBUS_STATUS_OK;
 704 }
 705
 706 static int
 707 rpc_file_exec(struct ubus_context *ctx, struct ubus_object *obj,
 708               struct ubus_request_data *req, const char *method,
 709               struct blob_attr *msg)
 710 {
 711         struct blob_attr *tb[__RPC_E_MAX];
 712
 713         blobmsg_parse(rpc_exec_policy, __RPC_E_MAX, tb,
 714                       blob_data(msg), blob_len(msg));
 715
 716         if (!tb[RPC_E_CMD])
 717                 return UBUS_STATUS_INVALID_ARGUMENT;
 718
 719         return rpc_file_exec_run(blobmsg_data(tb[RPC_E_CMD]),
 720                                               tb[RPC_E_PARM], tb[RPC_E_ENV], ctx, req);
 721 }
 722
 723
 724 static int
 725 rpc_file_api_init(const struct rpc_daemon_ops *o, struct ubus_context *ctx)
 726 {
 727         static const struct ubus_method file_methods[] = {
 728                 UBUS_METHOD("read",    rpc_file_read,  rpc_file_rb_policy),
 729                 UBUS_METHOD("write",   rpc_file_write, rpc_file_rw_policy),
 730                 UBUS_METHOD("list",    rpc_file_list,  rpc_file_r_policy),
 731                 UBUS_METHOD("stat",    rpc_file_stat,  rpc_file_r_policy),
 732                 UBUS_METHOD("md5",     rpc_file_md5,   rpc_file_r_policy),
 733                 UBUS_METHOD("exec",    rpc_file_exec,  rpc_exec_policy),
 734         };
 735
 736         static struct ubus_object_type file_type =
 737                 UBUS_OBJECT_TYPE("luci-rpc-file", file_methods);
 738
 739         static struct ubus_object obj = {
 740                 .name = "file",
 741                 .type = &file_type,
 742                 .methods = file_methods,
 743                 .n_methods = ARRAY_SIZE(file_methods),
 744         };
 745
 746         return ubus_add_object(ctx, &obj);
 747 }
 748
 749 struct rpc_plugin rpc_plugin = {
 750         .init = rpc_file_api_init
 751 };