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