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 <stdint.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <limits.h>
  27 #include <dirent.h>
  28 #include <sys/stat.h>
  29 #include <sys/wait.h>
  30 #include <libubus.h>
  31 #include <libubox/blobmsg.h>
  32 #include <libubox/md5.h>
  33 #include <libubox/ustream.h>
  34 #include <libubox/utils.h>
  35
  36 #include <rpcd/plugin.h>
  37
  38 /* limit of sys & proc files */
  39 #define RPC_FILE_MIN_SIZE               (128)
  40
  41 /* limit of regular files and command output data */
  42 #define RPC_FILE_MAX_SIZE               (4096 * 64)
  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 static const struct rpc_daemon_ops *ops;
  58
  59 struct rpc_file_exec_context {
  60         struct ubus_context *context;
  61         struct ubus_request_data request;
  62         struct uloop_timeout timeout;
  63         struct uloop_process process;
  64         struct ustream_fd opipe;
  65         struct ustream_fd epipe;
  66         int stat;
  67 };
  68
  69
  70 static struct blob_buf buf;
  71
  72 enum {
  73         RPC_F_R_PATH,
  74         __RPC_F_R_MAX,
  75 };
  76
  77 static const struct blobmsg_policy rpc_file_r_policy[__RPC_F_R_MAX] = {
  78         [RPC_F_R_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
  79 };
  80
  81 enum {
  82         RPC_F_RB_PATH,
  83         RPC_F_RB_BASE64,
  84         __RPC_F_RB_MAX,
  85 };
  86
  87 static const struct blobmsg_policy rpc_file_rb_policy[__RPC_F_RB_MAX] = {
  88         [RPC_F_RB_PATH]   = { .name = "path",   .type = BLOBMSG_TYPE_STRING },
  89         [RPC_F_RB_BASE64] = { .name = "base64", .type = BLOBMSG_TYPE_BOOL   },
  90 };
  91
  92 enum {
  93         RPC_F_RW_PATH,
  94         RPC_F_RW_DATA,
  95         RPC_F_RW_APPEND,
  96         RPC_F_RW_MODE,
  97         RPC_F_RW_BASE64,
  98         __RPC_F_RW_MAX,
  99 };
 100
 101 static const struct blobmsg_policy rpc_file_rw_policy[__RPC_F_RW_MAX] = {
 102         [RPC_F_RW_PATH]   = { .name = "path",   .type = BLOBMSG_TYPE_STRING },
 103         [RPC_F_RW_DATA]   = { .name = "data",   .type = BLOBMSG_TYPE_STRING },
 104         [RPC_F_RW_APPEND] = { .name = "append", .type = BLOBMSG_TYPE_BOOL  },
 105         [RPC_F_RW_MODE]   = { .name = "mode",   .type = BLOBMSG_TYPE_INT32  },
 106         [RPC_F_RW_BASE64] = { .name = "base64", .type = BLOBMSG_TYPE_BOOL   },
 107 };
 108
 109 enum {
 110         RPC_E_CMD,
 111         RPC_E_PARM,
 112         RPC_E_ENV,
 113         __RPC_E_MAX,
 114 };
 115
 116 static const struct blobmsg_policy rpc_exec_policy[__RPC_E_MAX] = {
 117         [RPC_E_CMD]  = { .name = "command", .type = BLOBMSG_TYPE_STRING },
 118         [RPC_E_PARM] = { .name = "params",  .type = BLOBMSG_TYPE_ARRAY  },
 119         [RPC_E_ENV]  = { .name = "env",     .type = BLOBMSG_TYPE_TABLE  },
 120 };
 121
 122 static const char *d_types[] = {
 123         [DT_BLK]     = "block",
 124         [DT_CHR]     = "char",
 125         [DT_DIR]     = "directory",
 126         [DT_FIFO]    = "fifo",
 127         [DT_LNK]     = "symlink",
 128         [DT_REG]     = "file",
 129         [DT_SOCK]    = "socket",
 130         [DT_UNKNOWN] = "unknown",
 131 };
 132
 133
 134 static int
 135 rpc_errno_status(void)
 136 {
 137         switch (errno)
 138         {
 139         case EACCES:
 140                 return UBUS_STATUS_PERMISSION_DENIED;
 141
 142         case ENOTDIR:
 143                 return UBUS_STATUS_INVALID_ARGUMENT;
 144
 145         case ENOENT:
 146                 return UBUS_STATUS_NOT_FOUND;
 147
 148         case EINVAL:
 149                 return UBUS_STATUS_INVALID_ARGUMENT;
 150
 151         default:
 152                 return UBUS_STATUS_UNKNOWN_ERROR;
 153         }
 154 }
 155
 156 static struct blob_attr **
 157 rpc_check_path(struct blob_attr *msg, char **path, struct stat *s)
 158 {
 159         static struct blob_attr *tb[__RPC_F_R_MAX];
 160
 161         blobmsg_parse(rpc_file_r_policy, __RPC_F_R_MAX, tb, blob_data(msg), blob_len(msg));
 162
 163         if (!tb[RPC_F_R_PATH])
 164         {
 165                 errno = EINVAL;
 166                 return NULL;
 167         }
 168
 169         *path = blobmsg_data(tb[RPC_F_R_PATH]);
 170
 171         if (stat(*path, s))
 172                 return NULL;
 173
 174         return tb;
 175 }
 176
 177 static int
 178 rpc_file_read(struct ubus_context *ctx, struct ubus_object *obj,
 179               struct ubus_request_data *req, const char *method,
 180               struct blob_attr *msg)
 181 {
 182         static struct blob_attr *tb[__RPC_F_RB_MAX];
 183         bool base64 = false;
 184         int fd, rv;
 185         ssize_t len;
 186         char *path;
 187         struct stat s;
 188         char *wbuf;
 189
 190         blobmsg_parse(rpc_file_rb_policy, __RPC_F_RB_MAX, tb, blob_data(msg), blob_len(msg));
 191
 192         if (!tb[RPC_F_RB_PATH])
 193                 return rpc_errno_status();
 194
 195         path = blobmsg_data(tb[RPC_F_RB_PATH]);
 196
 197         if (stat(path, &s))
 198                 return rpc_errno_status();
 199
 200         if (s.st_size >= RPC_FILE_MAX_SIZE)
 201                 return UBUS_STATUS_NOT_SUPPORTED;
 202
 203         if ((fd = open(path, O_RDONLY)) < 0)
 204                 return rpc_errno_status();
 205
 206         /* some sysfs files do not report a length */
 207         if (s.st_size == 0)
 208                 s.st_size = RPC_FILE_MIN_SIZE;
 209
 210         blob_buf_init(&buf, 0);
 211
 212         if (tb[RPC_F_RB_BASE64])
 213                 base64 = blobmsg_get_bool(tb[RPC_F_RB_BASE64]);
 214
 215         len = s.st_size + 1;
 216         if (base64)
 217                 len = B64_ENCODE_LEN(s.st_size);
 218         wbuf = blobmsg_alloc_string_buffer(&buf, "data", len);
 219
 220         if (!wbuf)
 221         {
 222                 rv = UBUS_STATUS_UNKNOWN_ERROR;
 223                 goto out;
 224         }
 225
 226         if ((len = read(fd, wbuf, s.st_size)) <= 0)
 227         {
 228                 rv = UBUS_STATUS_NO_DATA;
 229                 goto out;
 230         }
 231
 232         if (base64)
 233         {
 234                 uint8_t *data = calloc(len, sizeof(uint8_t));
 235                 if (!data)
 236                 {
 237                         rv = UBUS_STATUS_UNKNOWN_ERROR;
 238                         goto out;
 239                 }
 240                 memcpy(data, wbuf, len);
 241
 242                 len = b64_encode(data, len, wbuf, B64_ENCODE_LEN(len));
 243                 free(data);
 244                 if (len < 0)
 245                 {
 246                         rv = UBUS_STATUS_UNKNOWN_ERROR;
 247                         goto out;
 248                 }
 249         }
 250
 251         *(wbuf + len) = '\0';
 252         blobmsg_add_string_buffer(&buf);
 253
 254         ubus_send_reply(ctx, req, buf.head);
 255         rv = UBUS_STATUS_OK;
 256
 257 out:
 258         blob_buf_free(&buf);
 259         close(fd);
 260         return rv;
 261 }
 262
 263 static int
 264 rpc_file_write(struct ubus_context *ctx, struct ubus_object *obj,
 265                struct ubus_request_data *req, const char *method,
 266                struct blob_attr *msg)
 267 {
 268         struct blob_attr *tb[__RPC_F_RW_MAX];
 269         int append = O_TRUNC;
 270         mode_t prev_mode, mode = 0666;
 271         int fd, rv = 0;
 272         void *data = NULL;
 273         ssize_t data_len = 0;
 274
 275         blobmsg_parse(rpc_file_rw_policy, __RPC_F_RW_MAX, tb,
 276                       blob_data(msg), blob_len(msg));
 277
 278         if (!tb[RPC_F_RW_PATH] || !tb[RPC_F_RW_DATA])
 279                 return UBUS_STATUS_INVALID_ARGUMENT;
 280
 281         data = blobmsg_data(tb[RPC_F_RW_DATA]);
 282         data_len = blobmsg_data_len(tb[RPC_F_RW_DATA]) - 1;
 283
 284         if (tb[RPC_F_RW_APPEND] && blobmsg_get_bool(tb[RPC_F_RW_APPEND]))
 285                 append = O_APPEND;
 286
 287         if (tb[RPC_F_RW_MODE])
 288                 mode = blobmsg_get_u32(tb[RPC_F_RW_MODE]);
 289
 290         prev_mode = umask(0);
 291         fd = open(blobmsg_data(tb[RPC_F_RW_PATH]), O_CREAT | O_WRONLY | append, mode);
 292         umask(prev_mode);
 293         if (fd < 0)
 294                 return rpc_errno_status();
 295
 296         if (tb[RPC_F_RW_BASE64] && blobmsg_get_bool(tb[RPC_F_RW_BASE64]))
 297         {
 298                 data_len = b64_decode(data, data, data_len);
 299                 if (data_len < 0)
 300                 {
 301                         rv = UBUS_STATUS_UNKNOWN_ERROR;
 302                         goto out;
 303                 }
 304         }
 305
 306         if (write(fd, data, data_len) < 0)
 307                 rv = -1;
 308
 309 out:
 310         if (fsync(fd) < 0)
 311                 rv = -1;
 312
 313         close(fd);
 314         sync();
 315
 316         if (rv)
 317                 return rpc_errno_status();
 318
 319         return 0;
 320 }
 321
 322 static int
 323 rpc_file_md5(struct ubus_context *ctx, struct ubus_object *obj,
 324              struct ubus_request_data *req, const char *method,
 325              struct blob_attr *msg)
 326 {
 327         int rv, i;
 328         char *path;
 329         struct stat s;
 330         uint8_t md5[16];
 331         char *wbuf;
 332
 333         if (!rpc_check_path(msg, &path, &s))
 334                 return rpc_errno_status();
 335
 336         if (!S_ISREG(s.st_mode))
 337                 return UBUS_STATUS_NOT_SUPPORTED;
 338
 339         if ((rv = md5sum(path, md5)) <= 0)
 340                 return rpc_errno_status();
 341
 342         blob_buf_init(&buf, 0);
 343         wbuf = blobmsg_alloc_string_buffer(&buf, "md5", 33);
 344
 345         for (i = 0; i < 16; i++)
 346                 sprintf(wbuf + (i * 2), "%02x", (uint8_t) md5[i]);
 347
 348         blobmsg_add_string_buffer(&buf);
 349         ubus_send_reply(ctx, req, buf.head);
 350         blob_buf_free(&buf);
 351
 352         return UBUS_STATUS_OK;
 353 }
 354
 355 static int
 356 rpc_file_list(struct ubus_context *ctx, struct ubus_object *obj,
 357               struct ubus_request_data *req, const char *method,
 358               struct blob_attr *msg)
 359 {
 360         DIR *fd;
 361         void *c, *d;
 362         char *path;
 363         struct stat s;
 364         struct dirent *e;
 365
 366         if (!rpc_check_path(msg, &path, &s))
 367                 return rpc_errno_status();
 368
 369         if ((fd = opendir(path)) == NULL)
 370                 return rpc_errno_status();
 371
 372         blob_buf_init(&buf, 0);
 373         c = blobmsg_open_array(&buf, "entries");
 374
 375         while ((e = readdir(fd)) != NULL)
 376         {
 377                 if (!strcmp(e->d_name, ".") || !strcmp(e->d_name, ".."))
 378                         continue;
 379
 380                 d = blobmsg_open_table(&buf, NULL);
 381                 blobmsg_add_string(&buf, "name", e->d_name);
 382                 blobmsg_add_string(&buf, "type", d_types[e->d_type]);
 383                 blobmsg_close_table(&buf, d);
 384         }
 385
 386         closedir(fd);
 387
 388         blobmsg_close_array(&buf, c);
 389         ubus_send_reply(ctx, req, buf.head);
 390         blob_buf_free(&buf);
 391
 392         return 0;
 393 }
 394
 395 static int
 396 rpc_file_stat(struct ubus_context *ctx, struct ubus_object *obj,
 397               struct ubus_request_data *req, const char *method,
 398               struct blob_attr *msg)
 399 {
 400         int type;
 401         char *path;
 402         struct stat s;
 403
 404         if (!rpc_check_path(msg, &path, &s))
 405                 return rpc_errno_status();
 406
 407         blob_buf_init(&buf, 0);
 408
 409         type = S_ISREG(s.st_mode) ? DT_REG :
 410                 S_ISDIR(s.st_mode) ? DT_DIR :
 411                  S_ISCHR(s.st_mode) ? DT_CHR :
 412                   S_ISBLK(s.st_mode) ? DT_BLK :
 413                    S_ISFIFO(s.st_mode) ? DT_FIFO :
 414                     S_ISLNK(s.st_mode) ? DT_LNK :
 415                      S_ISSOCK(s.st_mode) ? DT_SOCK :
 416                       DT_UNKNOWN;
 417
 418         blobmsg_add_string(&buf, "path", path);
 419         blobmsg_add_string(&buf, "type", d_types[type]);
 420         blobmsg_add_u32(&buf, "size",  s.st_size);
 421         blobmsg_add_u32(&buf, "mode",  s.st_mode);
 422         blobmsg_add_u32(&buf, "atime", s.st_atime);
 423         blobmsg_add_u32(&buf, "mtime", s.st_mtime);
 424         blobmsg_add_u32(&buf, "ctime", s.st_ctime);
 425         blobmsg_add_u32(&buf, "inode", s.st_ino);
 426         blobmsg_add_u32(&buf, "uid",   s.st_uid);
 427         blobmsg_add_u32(&buf, "gid",   s.st_gid);
 428
 429         ubus_send_reply(ctx, req, buf.head);
 430         blob_buf_free(&buf);
 431
 432         return 0;
 433 }
 434
 435 static const char *
 436 rpc_file_exec_lookup(const char *cmd)
 437 {
 438         struct stat s;
 439         int plen = 0, clen = strlen(cmd) + 1;
 440         char *search, *p;
 441         static char path[PATH_MAX];
 442
 443         if (!stat(cmd, &s) && S_ISREG(s.st_mode))
 444                 return cmd;
 445
 446         search = getenv("PATH");
 447
 448         if (!search)
 449                 search = "/bin:/usr/bin:/sbin:/usr/sbin";
 450
 451         p = search;
 452
 453         do
 454         {
 455                 if (*p != ':' && *p != '\0')
 456                         continue;
 457
 458                 plen = p - search;
 459
 460                 if ((plen + clen) >= sizeof(path))
 461                         continue;
 462
 463                 strncpy(path, search, plen);
 464                 sprintf(path + plen, "/%s", cmd);
 465
 466                 if (!stat(path, &s) && S_ISREG(s.st_mode))
 467                         return path;
 468
 469                 search = p + 1;
 470         }
 471         while (*p++);
 472
 473         return NULL;
 474 }
 475
 476
 477 static void
 478 rpc_ustream_to_blobmsg(struct ustream *s, const char *name)
 479 {
 480         int len;
 481         char *rbuf, *wbuf;
 482
 483         if ((len = ustream_pending_data(s, false)) > 0)
 484         {
 485                 wbuf = blobmsg_alloc_string_buffer(&buf, name, len + 1);
 486
 487                 if (!wbuf)
 488                         return;
 489
 490                 ustream_for_each_read_buffer(s, rbuf, len)
 491                 {
 492                         memcpy(wbuf, rbuf, len);
 493                         wbuf += len;
 494                 }
 495
 496                 *wbuf = 0;
 497                 blobmsg_add_string_buffer(&buf);
 498         }
 499 }
 500
 501 static void
 502 rpc_file_exec_reply(struct rpc_file_exec_context *c, int rv)
 503 {
 504         uloop_timeout_cancel(&c->timeout);
 505         uloop_process_delete(&c->process);
 506
 507         if (rv == UBUS_STATUS_OK)
 508         {
 509                 blob_buf_init(&buf, 0);
 510
 511                 blobmsg_add_u32(&buf, "code", WEXITSTATUS(c->stat));
 512
 513                 rpc_ustream_to_blobmsg(&c->opipe.stream, "stdout");
 514                 rpc_ustream_to_blobmsg(&c->epipe.stream, "stderr");
 515
 516                 ubus_send_reply(c->context, &c->request, buf.head);
 517                 blob_buf_free(&buf);
 518         }
 519
 520         ubus_complete_deferred_request(c->context, &c->request, rv);
 521
 522         ustream_free(&c->opipe.stream);
 523         ustream_free(&c->epipe.stream);
 524
 525         close(c->opipe.fd.fd);
 526         close(c->epipe.fd.fd);
 527
 528         free(c);
 529 }
 530
 531 static void
 532 rpc_file_exec_timeout_cb(struct uloop_timeout *t)
 533 {
 534         struct rpc_file_exec_context *c =
 535                 container_of(t, struct rpc_file_exec_context, timeout);
 536
 537         kill(c->process.pid, SIGKILL);
 538         rpc_file_exec_reply(c, UBUS_STATUS_TIMEOUT);
 539 }
 540
 541 static void
 542 rpc_file_exec_process_cb(struct uloop_process *p, int stat)
 543 {
 544         struct rpc_file_exec_context *c =
 545                 container_of(p, struct rpc_file_exec_context, process);
 546
 547         c->stat = stat;
 548
 549         ustream_poll(&c->opipe.stream);
 550         ustream_poll(&c->epipe.stream);
 551 }
 552
 553 static void
 554 rpc_file_exec_opipe_read_cb(struct ustream *s, int bytes)
 555 {
 556         struct rpc_file_exec_context *c =
 557                 container_of(s, struct rpc_file_exec_context, opipe.stream);
 558
 559         if (ustream_read_buf_full(s))
 560                 rpc_file_exec_reply(c, UBUS_STATUS_NOT_SUPPORTED);
 561 }
 562
 563 static void
 564 rpc_file_exec_epipe_read_cb(struct ustream *s, int bytes)
 565 {
 566         struct rpc_file_exec_context *c =
 567                 container_of(s, struct rpc_file_exec_context, epipe.stream);
 568
 569         if (ustream_read_buf_full(s))
 570                 rpc_file_exec_reply(c, UBUS_STATUS_NOT_SUPPORTED);
 571 }
 572
 573 static void
 574 rpc_file_exec_opipe_state_cb(struct ustream *s)
 575 {
 576         struct rpc_file_exec_context *c =
 577                 container_of(s, struct rpc_file_exec_context, opipe.stream);
 578
 579         if (c->opipe.stream.eof && c->epipe.stream.eof)
 580                 rpc_file_exec_reply(c, UBUS_STATUS_OK);
 581 }
 582
 583 static void
 584 rpc_file_exec_epipe_state_cb(struct ustream *s)
 585 {
 586         struct rpc_file_exec_context *c =
 587                 container_of(s, struct rpc_file_exec_context, epipe.stream);
 588
 589         if (c->opipe.stream.eof && c->epipe.stream.eof)
 590                 rpc_file_exec_reply(c, UBUS_STATUS_OK);
 591 }
 592
 593 static void
 594 rpc_fdclose(int fd)
 595 {
 596         if (fd > 2)
 597                 close(fd);
 598 }
 599
 600 static int
 601 rpc_file_exec_run(const char *cmd,
 602                   const struct blob_attr *arg, const struct blob_attr *env,
 603                   struct ubus_context *ctx, struct ubus_request_data *req)
 604 {
 605         pid_t pid;
 606
 607         int devnull;
 608         int opipe[2];
 609         int epipe[2];
 610
 611         int rem;
 612         struct blob_attr *cur;
 613
 614         uint8_t arglen;
 615         char **args, **tmp;
 616
 617         struct rpc_file_exec_context *c;
 618
 619         cmd = rpc_file_exec_lookup(cmd);
 620
 621         if (!cmd)
 622                 return UBUS_STATUS_NOT_FOUND;
 623
 624         c = malloc(sizeof(*c));
 625
 626         if (!c)
 627                 return UBUS_STATUS_UNKNOWN_ERROR;
 628
 629         if (pipe(opipe) || pipe(epipe))
 630                 return rpc_errno_status();
 631
 632         switch ((pid = fork()))
 633         {
 634         case -1:
 635                 return rpc_errno_status();
 636
 637         case 0:
 638                 uloop_done();
 639
 640                 devnull = open("/dev/null", O_RDWR);
 641
 642                 if (devnull == -1)
 643                         return UBUS_STATUS_UNKNOWN_ERROR;
 644
 645                 dup2(devnull, 0);
 646                 dup2(opipe[1], 1);
 647                 dup2(epipe[1], 2);
 648
 649                 rpc_fdclose(devnull);
 650                 rpc_fdclose(opipe[0]);
 651                 rpc_fdclose(opipe[1]);
 652                 rpc_fdclose(epipe[0]);
 653                 rpc_fdclose(epipe[1]);
 654
 655                 arglen = 2;
 656                 args = malloc(sizeof(char *) * arglen);
 657
 658                 if (!args)
 659                         return UBUS_STATUS_UNKNOWN_ERROR;
 660
 661                 args[0] = (char *)cmd;
 662                 args[1] = NULL;
 663
 664                 if (arg)
 665                 {
 666                         blobmsg_for_each_attr(cur, arg, rem)
 667                         {
 668                                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 669                                         continue;
 670
 671                                 if (arglen == 255)
 672                                 {
 673                                         free(args);
 674                                         return UBUS_STATUS_INVALID_ARGUMENT;
 675                                 }
 676
 677                                 arglen++;
 678                                 tmp = realloc(args, sizeof(char *) * arglen);
 679
 680                                 if (!tmp)
 681                                 {
 682                                         free(args);
 683                                         return UBUS_STATUS_UNKNOWN_ERROR;
 684                                 }
 685
 686                                 args = tmp;
 687                                 args[arglen-2] = blobmsg_data(cur);
 688                                 args[arglen-1] = NULL;
 689                         }
 690                 }
 691
 692                 if (env)
 693                 {
 694                         blobmsg_for_each_attr(cur, env, rem)
 695                         {
 696                                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 697                                         continue;
 698
 699                                 setenv(blobmsg_name(cur), blobmsg_data(cur), 1);
 700                         }
 701                 }
 702
 703                 if (execv(cmd, args))
 704                         return rpc_errno_status();
 705
 706         default:
 707                 memset(c, 0, sizeof(*c));
 708
 709                 ustream_declare(c->opipe, opipe[0], exec_opipe);
 710                 ustream_declare(c->epipe, epipe[0], exec_epipe);
 711
 712                 c->process.pid = pid;
 713                 c->process.cb = rpc_file_exec_process_cb;
 714                 uloop_process_add(&c->process);
 715
 716                 c->timeout.cb = rpc_file_exec_timeout_cb;
 717                 uloop_timeout_set(&c->timeout, *ops->exec_timeout);
 718
 719                 close(opipe[1]);
 720                 close(epipe[1]);
 721
 722                 c->context = ctx;
 723                 ubus_defer_request(ctx, req, &c->request);
 724         }
 725
 726         return UBUS_STATUS_OK;
 727 }
 728
 729 static int
 730 rpc_file_exec(struct ubus_context *ctx, struct ubus_object *obj,
 731               struct ubus_request_data *req, const char *method,
 732               struct blob_attr *msg)
 733 {
 734         struct blob_attr *tb[__RPC_E_MAX];
 735
 736         blobmsg_parse(rpc_exec_policy, __RPC_E_MAX, tb,
 737                       blob_data(msg), blob_len(msg));
 738
 739         if (!tb[RPC_E_CMD])
 740                 return UBUS_STATUS_INVALID_ARGUMENT;
 741
 742         return rpc_file_exec_run(blobmsg_data(tb[RPC_E_CMD]),
 743                                               tb[RPC_E_PARM], tb[RPC_E_ENV], ctx, req);
 744 }
 745
 746
 747 static int
 748 rpc_file_api_init(const struct rpc_daemon_ops *o, struct ubus_context *ctx)
 749 {
 750         static const struct ubus_method file_methods[] = {
 751                 UBUS_METHOD("read",    rpc_file_read,  rpc_file_rb_policy),
 752                 UBUS_METHOD("write",   rpc_file_write, rpc_file_rw_policy),
 753                 UBUS_METHOD("list",    rpc_file_list,  rpc_file_r_policy),
 754                 UBUS_METHOD("stat",    rpc_file_stat,  rpc_file_r_policy),
 755                 UBUS_METHOD("md5",     rpc_file_md5,   rpc_file_r_policy),
 756                 UBUS_METHOD("exec",    rpc_file_exec,  rpc_exec_policy),
 757         };
 758
 759         static struct ubus_object_type file_type =
 760                 UBUS_OBJECT_TYPE("luci-rpc-file", file_methods);
 761
 762         static struct ubus_object obj = {
 763                 .name = "file",
 764                 .type = &file_type,
 765                 .methods = file_methods,
 766                 .n_methods = ARRAY_SIZE(file_methods),
 767         };
 768
 769         ops = o;
 770
 771         return ubus_add_object(ctx, &obj);
 772 }
 773
 774 struct rpc_plugin rpc_plugin = {
 775         .init = rpc_file_api_init
 776 };