system.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <sys/utsname.h>
  16 #ifdef linux
  17 #include <sys/sysinfo.h>
  18 #endif
  19 #include <sys/ioctl.h>
  20 #include <sys/types.h>
  21 #include <sys/reboot.h>
  22 #include <sys/stat.h>
  23 #include <fcntl.h>
  24 #include <signal.h>
  25 #include <unistd.h>
  26 #include <stdlib.h>
  27
  28 #include <json-c/json_tokener.h>
  29 #include <libubox/blobmsg_json.h>
  30 #include <libubox/uloop.h>
  31
  32 #include "procd.h"
  33 #include "sysupgrade.h"
  34 #include "watchdog.h"
  35
  36 static struct blob_buf b;
  37 static int notify;
  38 static struct ubus_context *_ctx;
  39 static int initramfs;
  40
  41 enum vjson_state {
  42         VJSON_ERROR,
  43         VJSON_CONTINUE,
  44         VJSON_SUCCESS,
  45 };
  46
  47 static const char *system_rootfs_type(void) {
  48         const char proc_mounts[] = "/proc/self/mounts";
  49         static char fstype[16] = { 0 };
  50         char *mountstr = NULL, *mp = "/", *pos, *tmp;
  51         FILE *mounts;
  52         ssize_t nread;
  53         size_t len = 0;
  54         bool found;
  55
  56         if (initramfs)
  57                 return "initramfs";
  58
  59         if (fstype[0])
  60                 return fstype;
  61
  62         mounts = fopen(proc_mounts, "r");
  63         if (!mounts)
  64                 return NULL;
  65
  66         while ((nread = getline(&mountstr, &len, mounts)) != -1) {
  67                 found = false;
  68
  69                 pos = strchr(mountstr, ' ');
  70                 if (!pos)
  71                         continue;
  72
  73                 tmp = pos + 1;
  74                 pos = strchr(tmp, ' ');
  75                 if (!pos)
  76                         continue;
  77
  78                 *pos = '\0';
  79                 if (strcmp(tmp, mp))
  80                         continue;
  81
  82                 tmp = pos + 1;
  83                 pos = strchr(tmp, ' ');
  84                 if (!pos)
  85                         continue;
  86
  87                 *pos = '\0';
  88
  89                 if (!strcmp(tmp, "overlay")) {
  90                         /*
  91                          * there is no point in parsing overlay option string for
  92                          * lowerdir, as that can point to "/" being a previous
  93                          * overlay mount (after firstboot or sysuprade config
  94                          * restore). Hence just assume the lowerdir is "/rom" and
  95                          * restart searching for that instead.
  96                          */
  97                         mp = "/rom";
  98                         fseek(mounts, 0, SEEK_SET);
  99                         continue;
 100                 }
 101
 102                 found = true;
 103                 break;
 104         }
 105
 106         if (found)
 107                 strncpy(fstype, tmp, sizeof(fstype) - 1);
 108
 109         fstype[sizeof(fstype) - 1]= '\0';
 110         free(mountstr);
 111         fclose(mounts);
 112
 113         if (found)
 114                 return fstype;
 115         else
 116                 return NULL;
 117 }
 118
 119 static int system_board(struct ubus_context *ctx, struct ubus_object *obj,
 120                  struct ubus_request_data *req, const char *method,
 121                  struct blob_attr *msg)
 122 {
 123         void *c;
 124         char line[256];
 125         char *key, *val, *next;
 126         const char *rootfs_type = system_rootfs_type();
 127         struct utsname utsname;
 128         FILE *f;
 129
 130         blob_buf_init(&b, 0);
 131
 132         if (uname(&utsname) >= 0)
 133         {
 134                 blobmsg_add_string(&b, "kernel", utsname.release);
 135                 blobmsg_add_string(&b, "hostname", utsname.nodename);
 136         }
 137
 138         if ((f = fopen("/proc/cpuinfo", "r")) != NULL)
 139         {
 140                 while(fgets(line, sizeof(line), f))
 141                 {
 142                         key = strtok(line, "\t:");
 143                         val = strtok(NULL, "\t\n");
 144
 145                         if (!key || !val)
 146                                 continue;
 147
 148 #ifdef __aarch64__
 149                         if (!strcasecmp(key, "CPU revision")) {
 150                                 snprintf(line, sizeof(line), "ARMv8 Processor rev %lu", strtoul(val + 2, NULL, 16));
 151                                 blobmsg_add_string(&b, "system", line);
 152                                 break;
 153                         }
 154 #else
 155                         if (!strcasecmp(key, "system type") ||
 156                             !strcasecmp(key, "processor") ||
 157                             !strcasecmp(key, "cpu") ||
 158                             !strcasecmp(key, "model name"))
 159                         {
 160                                 strtoul(val + 2, &key, 0);
 161
 162                                 if (key == (val + 2) || *key != 0)
 163                                 {
 164                                         blobmsg_add_string(&b, "system", val + 2);
 165                                         break;
 166                                 }
 167                         }
 168 #endif
 169                 }
 170
 171                 fclose(f);
 172         }
 173
 174         if ((f = fopen("/tmp/sysinfo/model", "r")) != NULL ||
 175             (f = fopen("/proc/device-tree/model", "r")) != NULL)
 176         {
 177                 if (fgets(line, sizeof(line), f))
 178                 {
 179                         val = strtok(line, "\t\n");
 180
 181                         if (val)
 182                                 blobmsg_add_string(&b, "model", val);
 183                 }
 184
 185                 fclose(f);
 186         }
 187         else if ((f = fopen("/proc/cpuinfo", "r")) != NULL)
 188         {
 189                 while(fgets(line, sizeof(line), f))
 190                 {
 191                         key = strtok(line, "\t:");
 192                         val = strtok(NULL, "\t\n");
 193
 194                         if (!key || !val)
 195                                 continue;
 196
 197                         if (!strcasecmp(key, "machine") ||
 198                             !strcasecmp(key, "hardware"))
 199                         {
 200                                 blobmsg_add_string(&b, "model", val + 2);
 201                                 break;
 202                         }
 203                 }
 204
 205                 fclose(f);
 206         }
 207
 208         if ((f = fopen("/tmp/sysinfo/board_name", "r")) != NULL)
 209         {
 210                 if (fgets(line, sizeof(line), f))
 211                 {
 212                         val = strtok(line, "\t\n");
 213
 214                         if (val)
 215                                 blobmsg_add_string(&b, "board_name", val);
 216                 }
 217
 218                 fclose(f);
 219         }
 220         else if ((f = fopen("/proc/device-tree/compatible", "r")) != NULL)
 221         {
 222                 if (fgets(line, sizeof(line), f))
 223                 {
 224                         val = strtok(line, "\t\n");
 225
 226                         if (val)
 227                         {
 228                                 next = val;
 229                                 while ((next = strchr(next, ',')) != NULL)
 230                                 {
 231                                         *next = '-';
 232                                         next++;
 233                                 }
 234
 235                                 blobmsg_add_string(&b, "board_name", val);
 236                         }
 237                 }
 238
 239                 fclose(f);
 240         }
 241
 242         if (rootfs_type)
 243                 blobmsg_add_string(&b, "rootfs_type", rootfs_type);
 244
 245         if ((f = fopen("/etc/openwrt_release", "r")) != NULL)
 246         {
 247                 c = blobmsg_open_table(&b, "release");
 248
 249                 while (fgets(line, sizeof(line), f))
 250                 {
 251                         char *dest;
 252                         char ch;
 253
 254                         key = line;
 255                         val = strchr(line, '=');
 256                         if (!val)
 257                                 continue;
 258
 259                         *(val++) = 0;
 260
 261                         if (!strcasecmp(key, "DISTRIB_ID"))
 262                                 key = "distribution";
 263                         else if (!strcasecmp(key, "DISTRIB_RELEASE"))
 264                                 key = "version";
 265                         else if (!strcasecmp(key, "DISTRIB_REVISION"))
 266                                 key = "revision";
 267                         else if (!strcasecmp(key, "DISTRIB_CODENAME"))
 268                                 key = "codename";
 269                         else if (!strcasecmp(key, "DISTRIB_TARGET"))
 270                                 key = "target";
 271                         else if (!strcasecmp(key, "DISTRIB_DESCRIPTION"))
 272                                 key = "description";
 273                         else
 274                                 continue;
 275
 276                         dest = blobmsg_alloc_string_buffer(&b, key, strlen(val));
 277                         if (!dest) {
 278                                 ERROR("Failed to allocate blob.\n");
 279                                 continue;
 280                         }
 281
 282                         while (val && (ch = *(val++)) != 0) {
 283                                 switch (ch) {
 284                                 case '\'':
 285                                 case '"':
 286                                         next = strchr(val, ch);
 287                                         if (next)
 288                                                 *next = 0;
 289
 290                                         strcpy(dest, val);
 291
 292                                         if (next)
 293                                                 val = next + 1;
 294
 295                                         dest += strlen(dest);
 296                                         break;
 297                                 case '\\':
 298                                         *(dest++) = *(val++);
 299                                         break;
 300                                 }
 301                         }
 302                         blobmsg_add_string_buffer(&b);
 303                 }
 304
 305                 blobmsg_close_array(&b, c);
 306
 307                 fclose(f);
 308         }
 309
 310         ubus_send_reply(ctx, req, b.head);
 311
 312         return UBUS_STATUS_OK;
 313 }
 314
 315 static int system_info(struct ubus_context *ctx, struct ubus_object *obj,
 316                 struct ubus_request_data *req, const char *method,
 317                 struct blob_attr *msg)
 318 {
 319         time_t now;
 320         struct tm *tm;
 321 #ifdef linux
 322         struct sysinfo info;
 323         void *c;
 324         char line[256];
 325         char *key, *val;
 326         unsigned long long available, cached;
 327         FILE *f;
 328
 329         if (sysinfo(&info))
 330                 return UBUS_STATUS_UNKNOWN_ERROR;
 331
 332         if ((f = fopen("/proc/meminfo", "r")) == NULL)
 333                 return UBUS_STATUS_UNKNOWN_ERROR;
 334
 335         /* if linux < 3.14 MemAvailable is not in meminfo */
 336         available = 0;
 337         cached = 0;
 338
 339         while (fgets(line, sizeof(line), f))
 340         {
 341                 key = strtok(line, " :");
 342                 val = strtok(NULL, " ");
 343
 344                 if (!key || !val)
 345                         continue;
 346
 347                 if (!strcasecmp(key, "MemAvailable"))
 348                         available = 1024 * atoll(val);
 349                 else if (!strcasecmp(key, "Cached"))
 350                         cached = 1024 * atoll(val);
 351         }
 352
 353         fclose(f);
 354 #endif
 355
 356         now = time(NULL);
 357
 358         if (!(tm = localtime(&now)))
 359                 return UBUS_STATUS_UNKNOWN_ERROR;
 360
 361         blob_buf_init(&b, 0);
 362
 363         blobmsg_add_u32(&b, "localtime", now + tm->tm_gmtoff);
 364
 365 #ifdef linux
 366         blobmsg_add_u32(&b, "uptime",    info.uptime);
 367
 368         c = blobmsg_open_array(&b, "load");
 369         blobmsg_add_u32(&b, NULL, info.loads[0]);
 370         blobmsg_add_u32(&b, NULL, info.loads[1]);
 371         blobmsg_add_u32(&b, NULL, info.loads[2]);
 372         blobmsg_close_array(&b, c);
 373
 374         c = blobmsg_open_table(&b, "memory");
 375         blobmsg_add_u64(&b, "total",
 376                         (uint64_t)info.mem_unit * (uint64_t)info.totalram);
 377         blobmsg_add_u64(&b, "free",
 378                         (uint64_t)info.mem_unit * (uint64_t)info.freeram);
 379         blobmsg_add_u64(&b, "shared",
 380                         (uint64_t)info.mem_unit * (uint64_t)info.sharedram);
 381         blobmsg_add_u64(&b, "buffered",
 382                         (uint64_t)info.mem_unit * (uint64_t)info.bufferram);
 383         blobmsg_add_u64(&b, "available", available);
 384         blobmsg_add_u64(&b, "cached", cached);
 385         blobmsg_close_table(&b, c);
 386
 387         c = blobmsg_open_table(&b, "swap");
 388         blobmsg_add_u64(&b, "total",
 389                         (uint64_t)info.mem_unit * (uint64_t)info.totalswap);
 390         blobmsg_add_u64(&b, "free",
 391                         (uint64_t)info.mem_unit * (uint64_t)info.freeswap);
 392         blobmsg_close_table(&b, c);
 393 #endif
 394
 395         ubus_send_reply(ctx, req, b.head);
 396
 397         return UBUS_STATUS_OK;
 398 }
 399
 400 static int system_reboot(struct ubus_context *ctx, struct ubus_object *obj,
 401                          struct ubus_request_data *req, const char *method,
 402                          struct blob_attr *msg)
 403 {
 404         procd_shutdown(RB_AUTOBOOT);
 405         return 0;
 406 }
 407
 408 enum {
 409         WDT_FREQUENCY,
 410         WDT_TIMEOUT,
 411         WDT_MAGICCLOSE,
 412         WDT_STOP,
 413         __WDT_MAX
 414 };
 415
 416 static const struct blobmsg_policy watchdog_policy[__WDT_MAX] = {
 417         [WDT_FREQUENCY] = { .name = "frequency", .type = BLOBMSG_TYPE_INT32 },
 418         [WDT_TIMEOUT] = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
 419         [WDT_MAGICCLOSE] = { .name = "magicclose", .type = BLOBMSG_TYPE_BOOL },
 420         [WDT_STOP] = { .name = "stop", .type = BLOBMSG_TYPE_BOOL },
 421 };
 422
 423 static int watchdog_set(struct ubus_context *ctx, struct ubus_object *obj,
 424                         struct ubus_request_data *req, const char *method,
 425                         struct blob_attr *msg)
 426 {
 427         struct blob_attr *tb[__WDT_MAX];
 428         const char *status;
 429
 430         if (!msg)
 431                 return UBUS_STATUS_INVALID_ARGUMENT;
 432
 433         blobmsg_parse(watchdog_policy, __WDT_MAX, tb, blob_data(msg), blob_len(msg));
 434         if (tb[WDT_FREQUENCY]) {
 435                 unsigned int timeout = tb[WDT_TIMEOUT] ? blobmsg_get_u32(tb[WDT_TIMEOUT]) :
 436                                                 watchdog_timeout(0);
 437                 unsigned int freq = blobmsg_get_u32(tb[WDT_FREQUENCY]);
 438
 439                 if (freq) {
 440                         if (freq > timeout / 2)
 441                                 freq = timeout / 2;
 442                         watchdog_frequency(freq);
 443                 }
 444         }
 445
 446         if (tb[WDT_TIMEOUT]) {
 447                 unsigned int timeout = blobmsg_get_u32(tb[WDT_TIMEOUT]);
 448                 unsigned int frequency = watchdog_frequency(0);
 449
 450                 if (timeout <= frequency)
 451                         timeout = frequency * 2;
 452                 watchdog_timeout(timeout);
 453         }
 454
 455         if (tb[WDT_MAGICCLOSE])
 456                 watchdog_set_magicclose(blobmsg_get_bool(tb[WDT_MAGICCLOSE]));
 457
 458         if (tb[WDT_STOP])
 459                 watchdog_set_stopped(blobmsg_get_bool(tb[WDT_STOP]));
 460
 461         if (watchdog_fd() == NULL)
 462                 status = "offline";
 463         else if (watchdog_get_stopped())
 464                 status = "stopped";
 465         else
 466                 status = "running";
 467
 468         blob_buf_init(&b, 0);
 469         blobmsg_add_string(&b, "status", status);
 470         blobmsg_add_u32(&b, "timeout", watchdog_timeout(0));
 471         blobmsg_add_u32(&b, "frequency", watchdog_frequency(0));
 472         blobmsg_add_u8(&b, "magicclose", watchdog_get_magicclose());
 473         ubus_send_reply(ctx, req, b.head);
 474
 475         return 0;
 476 }
 477
 478 enum {
 479         SIGNAL_PID,
 480         SIGNAL_NUM,
 481         __SIGNAL_MAX
 482 };
 483
 484 static const struct blobmsg_policy signal_policy[__SIGNAL_MAX] = {
 485         [SIGNAL_PID] = { .name = "pid", .type = BLOBMSG_TYPE_INT32 },
 486         [SIGNAL_NUM] = { .name = "signum", .type = BLOBMSG_TYPE_INT32 },
 487 };
 488
 489 static int proc_signal(struct ubus_context *ctx, struct ubus_object *obj,
 490                         struct ubus_request_data *req, const char *method,
 491                         struct blob_attr *msg)
 492 {
 493         struct blob_attr *tb[__SIGNAL_MAX];
 494
 495         if (!msg)
 496                 return UBUS_STATUS_INVALID_ARGUMENT;
 497
 498         blobmsg_parse(signal_policy, __SIGNAL_MAX, tb, blob_data(msg), blob_len(msg));
 499         if (!tb[SIGNAL_PID || !tb[SIGNAL_NUM]])
 500                 return UBUS_STATUS_INVALID_ARGUMENT;
 501
 502         kill(blobmsg_get_u32(tb[SIGNAL_PID]), blobmsg_get_u32(tb[SIGNAL_NUM]));
 503
 504         return 0;
 505 }
 506
 507 __attribute__((format (printf, 2, 3)))
 508 static enum vjson_state vjson_error(char **b, const char *fmt, ...)
 509 {
 510         static char buf[256] = { 0 };
 511         const char *pfx = "Firmware image couldn't be validated: ";
 512         va_list va;
 513         int r;
 514
 515         r = snprintf(buf, sizeof(buf), "%s", pfx);
 516         if (r < 0) {
 517                 *b = "vjson_error() snprintf failed";
 518                 return VJSON_ERROR;
 519         }
 520
 521         va_start(va, fmt);
 522         r = vsnprintf(buf+r, sizeof(buf)-r, fmt, va);
 523         if (r < 0) {
 524                 *b = "vjson_error() vsnprintf failed";
 525                 return VJSON_ERROR;
 526         }
 527         va_end(va);
 528
 529         *b = buf;
 530         return VJSON_ERROR;
 531 }
 532
 533 static enum vjson_state vjson_parse_token(json_tokener *tok, char *buf, ssize_t len, char **err)
 534 {
 535         json_object *jsobj = NULL;
 536
 537         jsobj = json_tokener_parse_ex(tok, buf, len);
 538         if (json_tokener_get_error(tok) == json_tokener_continue)
 539                 return VJSON_CONTINUE;
 540
 541         if (json_tokener_get_error(tok) == json_tokener_success) {
 542                 if (json_object_get_type(jsobj) != json_type_object) {
 543                         json_object_put(jsobj);
 544                         return vjson_error(err, "result is not an JSON object");
 545                 }
 546
 547                 blobmsg_add_object(&b, jsobj);
 548                 json_object_put(jsobj);
 549                 return VJSON_SUCCESS;
 550         }
 551
 552         return vjson_error(err, "failed to parse JSON: %s (%d)",
 553                            json_tokener_error_desc(json_tokener_get_error(tok)),
 554                            json_tokener_get_error(tok));
 555 }
 556
 557 static enum vjson_state vjson_parse(int fd, char **err)
 558 {
 559         enum vjson_state r = VJSON_ERROR;
 560         size_t read_count = 0;
 561         char buf[64] = { 0 };
 562         json_tokener *tok;
 563         ssize_t len;
 564         int _errno;
 565
 566         tok = json_tokener_new();
 567         if (!tok)
 568                 return vjson_error(err, "json_tokener_new() failed");
 569
 570         vjson_error(err, "incomplete JSON input");
 571
 572         while ((len = read(fd, buf, sizeof(buf)))) {
 573                 if (len < 0 && errno == EINTR)
 574                         continue;
 575
 576                 if (len < 0) {
 577                         _errno = errno;
 578                         json_tokener_free(tok);
 579                         return vjson_error(err, "read() failed: %s (%d)",
 580                                            strerror(_errno), _errno);
 581                 }
 582
 583                 read_count += len;
 584                 r = vjson_parse_token(tok, buf, len, err);
 585                 if (r != VJSON_CONTINUE)
 586                         break;
 587
 588                 memset(buf, 0, sizeof(buf));
 589         }
 590
 591         if (read_count == 0)
 592                 vjson_error(err, "no JSON input");
 593
 594         json_tokener_free(tok);
 595         return r;
 596 }
 597
 598 /**
 599  * validate_firmware_image_call - perform validation & store result in global b
 600  *
 601  * @file: firmware image path
 602  */
 603 static enum vjson_state validate_firmware_image_call(const char *file, char **err)
 604 {
 605         const char *path = "/usr/libexec/validate_firmware_image";
 606         enum vjson_state ret = VJSON_ERROR;
 607         int _errno;
 608         int fds[2];
 609         int fd;
 610
 611         blob_buf_init(&b, 0);
 612         vjson_error(err, "unhandled error");
 613
 614         if (pipe(fds)) {
 615                 _errno = errno;
 616                 return vjson_error(err, "pipe() failed: %s (%d)",
 617                                    strerror(_errno), _errno);
 618         }
 619
 620         switch (fork()) {
 621         case -1:
 622                 _errno = errno;
 623
 624                 close(fds[0]);
 625                 close(fds[1]);
 626
 627                 return vjson_error(err, "fork() failed: %s (%d)",
 628                                    strerror(_errno), _errno);
 629         case 0:
 630                 /* Set stdin & stderr to /dev/null */
 631                 fd = open("/dev/null", O_RDWR);
 632                 if (fd >= 0) {
 633                         dup2(fd, 0);
 634                         dup2(fd, 2);
 635                         close(fd);
 636                 }
 637
 638                 /* Set stdout to the shared pipe */
 639                 dup2(fds[1], 1);
 640                 close(fds[0]);
 641                 close(fds[1]);
 642
 643                 execl(path, path, file, NULL);
 644                 exit(errno);
 645         }
 646
 647         /* Parent process */
 648         close(fds[1]);
 649
 650         ret = vjson_parse(fds[0], err);
 651         close(fds[0]);
 652
 653         return ret;
 654 }
 655
 656 enum {
 657         VALIDATE_FIRMWARE_IMAGE_PATH,
 658         __VALIDATE_FIRMWARE_IMAGE_MAX,
 659 };
 660
 661 static const struct blobmsg_policy validate_firmware_image_policy[__VALIDATE_FIRMWARE_IMAGE_MAX] = {
 662         [VALIDATE_FIRMWARE_IMAGE_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
 663 };
 664
 665 static int validate_firmware_image(struct ubus_context *ctx,
 666                                    struct ubus_object *obj,
 667                                    struct ubus_request_data *req,
 668                                    const char *method, struct blob_attr *msg)
 669 {
 670         struct blob_attr *tb[__VALIDATE_FIRMWARE_IMAGE_MAX];
 671         enum vjson_state ret = VJSON_ERROR;
 672         char *err;
 673
 674         if (!msg)
 675                 return UBUS_STATUS_INVALID_ARGUMENT;
 676
 677         blobmsg_parse(validate_firmware_image_policy, __VALIDATE_FIRMWARE_IMAGE_MAX, tb, blob_data(msg), blob_len(msg));
 678         if (!tb[VALIDATE_FIRMWARE_IMAGE_PATH])
 679                 return UBUS_STATUS_INVALID_ARGUMENT;
 680
 681         ret = validate_firmware_image_call(blobmsg_get_string(tb[VALIDATE_FIRMWARE_IMAGE_PATH]), &err);
 682         if (ret != VJSON_SUCCESS)
 683                 return UBUS_STATUS_UNKNOWN_ERROR;
 684
 685         ubus_send_reply(ctx, req, b.head);
 686
 687         return UBUS_STATUS_OK;
 688 }
 689
 690 enum {
 691         SYSUPGRADE_PATH,
 692         SYSUPGRADE_FORCE,
 693         SYSUPGRADE_BACKUP,
 694         SYSUPGRADE_PREFIX,
 695         SYSUPGRADE_COMMAND,
 696         SYSUPGRADE_OPTIONS,
 697         __SYSUPGRADE_MAX
 698 };
 699
 700 static const struct blobmsg_policy sysupgrade_policy[__SYSUPGRADE_MAX] = {
 701         [SYSUPGRADE_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
 702         [SYSUPGRADE_FORCE] = { .name = "force", .type = BLOBMSG_TYPE_BOOL },
 703         [SYSUPGRADE_BACKUP] = { .name = "backup", .type = BLOBMSG_TYPE_STRING },
 704         [SYSUPGRADE_PREFIX] = { .name = "prefix", .type = BLOBMSG_TYPE_STRING },
 705         [SYSUPGRADE_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_STRING },
 706         [SYSUPGRADE_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_TABLE },
 707 };
 708
 709 static void sysupgrade_error(struct ubus_context *ctx,
 710                              struct ubus_request_data *req,
 711                              const char *message)
 712 {
 713         void *c;
 714
 715         blob_buf_init(&b, 0);
 716
 717         c = blobmsg_open_table(&b, "error");
 718         blobmsg_add_string(&b, "message", message);
 719         blobmsg_close_table(&b, c);
 720
 721         ubus_send_reply(ctx, req, b.head);
 722 }
 723
 724 static int sysupgrade(struct ubus_context *ctx, struct ubus_object *obj,
 725                       struct ubus_request_data *req, const char *method,
 726                       struct blob_attr *msg)
 727 {
 728         enum {
 729                 VALIDATION_VALID,
 730                 VALIDATION_FORCEABLE,
 731                 VALIDATION_ALLOW_BACKUP,
 732                 __VALIDATION_MAX
 733         };
 734         static const struct blobmsg_policy validation_policy[__VALIDATION_MAX] = {
 735                 [VALIDATION_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_BOOL },
 736                 [VALIDATION_FORCEABLE] = { .name = "forceable", .type = BLOBMSG_TYPE_BOOL },
 737                 [VALIDATION_ALLOW_BACKUP] = { .name = "allow_backup", .type = BLOBMSG_TYPE_BOOL },
 738         };
 739         struct blob_attr *validation[__VALIDATION_MAX];
 740         struct blob_attr *tb[__SYSUPGRADE_MAX];
 741         bool valid, forceable, allow_backup;
 742         enum vjson_state ret = VJSON_ERROR;
 743         char *err;
 744
 745         if (!msg)
 746                 return UBUS_STATUS_INVALID_ARGUMENT;
 747
 748         blobmsg_parse(sysupgrade_policy, __SYSUPGRADE_MAX, tb, blob_data(msg), blob_len(msg));
 749         if (!tb[SYSUPGRADE_PATH] || !tb[SYSUPGRADE_PREFIX])
 750                 return UBUS_STATUS_INVALID_ARGUMENT;
 751
 752         ret = validate_firmware_image_call(blobmsg_get_string(tb[SYSUPGRADE_PATH]), &err);
 753         if (ret != VJSON_SUCCESS) {
 754                 sysupgrade_error(ctx, req, err);
 755                 return UBUS_STATUS_UNKNOWN_ERROR;
 756         }
 757
 758         blobmsg_parse(validation_policy, __VALIDATION_MAX, validation, blob_data(b.head), blob_len(b.head));
 759
 760         if (!validation[VALIDATION_VALID] || !validation[VALIDATION_FORCEABLE] ||
 761             !validation[VALIDATION_ALLOW_BACKUP]) {
 762                 sysupgrade_error(ctx, req, "Validation script provided invalid input");
 763                 return UBUS_STATUS_INVALID_ARGUMENT;
 764         }
 765
 766         valid = validation[VALIDATION_VALID] && blobmsg_get_bool(validation[VALIDATION_VALID]);
 767         forceable = validation[VALIDATION_FORCEABLE] && blobmsg_get_bool(validation[VALIDATION_FORCEABLE]);
 768         allow_backup = validation[VALIDATION_ALLOW_BACKUP] && blobmsg_get_bool(validation[VALIDATION_ALLOW_BACKUP]);
 769
 770         if (!valid) {
 771                 if (!forceable) {
 772                         sysupgrade_error(ctx, req, "Firmware image is broken and cannot be installed");
 773                         return UBUS_STATUS_NOT_SUPPORTED;
 774                 } else if (!tb[SYSUPGRADE_FORCE] || !blobmsg_get_bool(tb[SYSUPGRADE_FORCE])) {
 775                         sysupgrade_error(ctx, req, "Firmware image is invalid");
 776                         return UBUS_STATUS_NOT_SUPPORTED;
 777                 }
 778         } else if (!allow_backup && tb[SYSUPGRADE_BACKUP]) {
 779                 sysupgrade_error(ctx, req, "Firmware image doesn't allow preserving a backup");
 780                 return UBUS_STATUS_NOT_SUPPORTED;
 781         }
 782
 783         sysupgrade_exec_upgraded(blobmsg_get_string(tb[SYSUPGRADE_PREFIX]),
 784                                  blobmsg_get_string(tb[SYSUPGRADE_PATH]),
 785                                  tb[SYSUPGRADE_BACKUP] ? blobmsg_get_string(tb[SYSUPGRADE_BACKUP]) : NULL,
 786                                  tb[SYSUPGRADE_COMMAND] ? blobmsg_get_string(tb[SYSUPGRADE_COMMAND]) : NULL,
 787                                  tb[SYSUPGRADE_OPTIONS]);
 788
 789         /* sysupgrade_exec_upgraded() will never return unless something has gone wrong */
 790         return UBUS_STATUS_UNKNOWN_ERROR;
 791 }
 792
 793 static void
 794 procd_subscribe_cb(struct ubus_context *ctx, struct ubus_object *obj)
 795 {
 796         notify = obj->has_subscribers;
 797 }
 798
 799
 800 static const struct ubus_method system_methods[] = {
 801         UBUS_METHOD_NOARG("board", system_board),
 802         UBUS_METHOD_NOARG("info",  system_info),
 803         UBUS_METHOD_NOARG("reboot", system_reboot),
 804         UBUS_METHOD("watchdog", watchdog_set, watchdog_policy),
 805         UBUS_METHOD("signal", proc_signal, signal_policy),
 806         UBUS_METHOD("validate_firmware_image", validate_firmware_image, validate_firmware_image_policy),
 807         UBUS_METHOD("sysupgrade", sysupgrade, sysupgrade_policy),
 808 };
 809
 810 static struct ubus_object_type system_object_type =
 811         UBUS_OBJECT_TYPE("system", system_methods);
 812
 813 static struct ubus_object system_object = {
 814         .name = "system",
 815         .type = &system_object_type,
 816         .methods = system_methods,
 817         .n_methods = ARRAY_SIZE(system_methods),
 818         .subscribe_cb = procd_subscribe_cb,
 819 };
 820
 821 void
 822 procd_bcast_event(char *event, struct blob_attr *msg)
 823 {
 824         int ret;
 825
 826         if (!notify)
 827                 return;
 828
 829         ret = ubus_notify(_ctx, &system_object, event, msg, -1);
 830         if (ret)
 831                 fprintf(stderr, "Failed to notify log: %s\n", ubus_strerror(ret));
 832 }
 833
 834 void ubus_init_system(struct ubus_context *ctx)
 835 {
 836         int ret;
 837
 838         _ctx = ctx;
 839
 840         initramfs = !!getenv("INITRAMFS");
 841         if (initramfs)
 842                 unsetenv("INITRAMFS");
 843
 844         ret = ubus_add_object(ctx, &system_object);
 845         if (ret)
 846                 ERROR("Failed to add object: %s\n", ubus_strerror(ret));
 847 }