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