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
  40 static int system_board(struct ubus_context *ctx, struct ubus_object *obj,
  41                  struct ubus_request_data *req, const char *method,
  42                  struct blob_attr *msg)
  43 {
  44         void *c;
  45         char line[256];
  46         char *key, *val, *next;
  47         struct utsname utsname;
  48         FILE *f;
  49
  50         blob_buf_init(&b, 0);
  51
  52         if (uname(&utsname) >= 0)
  53         {
  54                 blobmsg_add_string(&b, "kernel", utsname.release);
  55                 blobmsg_add_string(&b, "hostname", utsname.nodename);
  56         }
  57
  58         if ((f = fopen("/proc/cpuinfo", "r")) != NULL)
  59         {
  60                 while(fgets(line, sizeof(line), f))
  61                 {
  62                         key = strtok(line, "\t:");
  63                         val = strtok(NULL, "\t\n");
  64
  65                         if (!key || !val)
  66                                 continue;
  67
  68                         if (!strcasecmp(key, "system type") ||
  69                             !strcasecmp(key, "processor") ||
  70                             !strcasecmp(key, "cpu") ||
  71                             !strcasecmp(key, "model name"))
  72                         {
  73                                 strtoul(val + 2, &key, 0);
  74
  75                                 if (key == (val + 2) || *key != 0)
  76                                 {
  77                                         blobmsg_add_string(&b, "system", val + 2);
  78                                         break;
  79                                 }
  80                         }
  81                 }
  82
  83                 fclose(f);
  84         }
  85
  86         if ((f = fopen("/tmp/sysinfo/model", "r")) != NULL ||
  87             (f = fopen("/proc/device-tree/model", "r")) != NULL)
  88         {
  89                 if (fgets(line, sizeof(line), f))
  90                 {
  91                         val = strtok(line, "\t\n");
  92
  93                         if (val)
  94                                 blobmsg_add_string(&b, "model", val);
  95                 }
  96
  97                 fclose(f);
  98         }
  99         else if ((f = fopen("/proc/cpuinfo", "r")) != NULL)
 100         {
 101                 while(fgets(line, sizeof(line), f))
 102                 {
 103                         key = strtok(line, "\t:");
 104                         val = strtok(NULL, "\t\n");
 105
 106                         if (!key || !val)
 107                                 continue;
 108
 109                         if (!strcasecmp(key, "machine") ||
 110                             !strcasecmp(key, "hardware"))
 111                         {
 112                                 blobmsg_add_string(&b, "model", val + 2);
 113                                 break;
 114                         }
 115                 }
 116
 117                 fclose(f);
 118         }
 119
 120         if ((f = fopen("/tmp/sysinfo/board_name", "r")) != NULL)
 121         {
 122                 if (fgets(line, sizeof(line), f))
 123                 {
 124                         val = strtok(line, "\t\n");
 125
 126                         if (val)
 127                                 blobmsg_add_string(&b, "board_name", val);
 128                 }
 129
 130                 fclose(f);
 131         }
 132         else if ((f = fopen("/proc/device-tree/compatible", "r")) != NULL)
 133         {
 134                 if (fgets(line, sizeof(line), f))
 135                 {
 136                         val = strtok(line, "\t\n");
 137
 138                         if (val)
 139                         {
 140                                 next = val;
 141                                 while ((next = strchr(next, ',')) != NULL)
 142                                 {
 143                                         *next = '-';
 144                                         next++;
 145                                 }
 146
 147                                 blobmsg_add_string(&b, "board_name", val);
 148                         }
 149                 }
 150
 151                 fclose(f);
 152         }
 153
 154         if ((f = fopen("/etc/openwrt_release", "r")) != NULL)
 155         {
 156                 c = blobmsg_open_table(&b, "release");
 157
 158                 while (fgets(line, sizeof(line), f))
 159                 {
 160                         char *dest;
 161                         char ch;
 162
 163                         key = line;
 164                         val = strchr(line, '=');
 165                         if (!val)
 166                                 continue;
 167
 168                         *(val++) = 0;
 169
 170                         if (!strcasecmp(key, "DISTRIB_ID"))
 171                                 key = "distribution";
 172                         else if (!strcasecmp(key, "DISTRIB_RELEASE"))
 173                                 key = "version";
 174                         else if (!strcasecmp(key, "DISTRIB_REVISION"))
 175                                 key = "revision";
 176                         else if (!strcasecmp(key, "DISTRIB_CODENAME"))
 177                                 key = "codename";
 178                         else if (!strcasecmp(key, "DISTRIB_TARGET"))
 179                                 key = "target";
 180                         else if (!strcasecmp(key, "DISTRIB_DESCRIPTION"))
 181                                 key = "description";
 182                         else
 183                                 continue;
 184
 185                         dest = blobmsg_alloc_string_buffer(&b, key, strlen(val));
 186                         if (!dest) {
 187                                 ERROR("Failed to allocate blob.\n");
 188                                 continue;
 189                         }
 190
 191                         while (val && (ch = *(val++)) != 0) {
 192                                 switch (ch) {
 193                                 case '\'':
 194                                 case '"':
 195                                         next = strchr(val, ch);
 196                                         if (next)
 197                                                 *next = 0;
 198
 199                                         strcpy(dest, val);
 200
 201                                         if (next)
 202                                                 val = next + 1;
 203
 204                                         dest += strlen(dest);
 205                                         break;
 206                                 case '\\':
 207                                         *(dest++) = *(val++);
 208                                         break;
 209                                 }
 210                         }
 211                         blobmsg_add_string_buffer(&b);
 212                 }
 213
 214                 blobmsg_close_array(&b, c);
 215
 216                 fclose(f);
 217         }
 218
 219         ubus_send_reply(ctx, req, b.head);
 220
 221         return UBUS_STATUS_OK;
 222 }
 223
 224 static int system_info(struct ubus_context *ctx, struct ubus_object *obj,
 225                 struct ubus_request_data *req, const char *method,
 226                 struct blob_attr *msg)
 227 {
 228         time_t now;
 229         struct tm *tm;
 230 #ifdef linux
 231         struct sysinfo info;
 232         void *c;
 233
 234         if (sysinfo(&info))
 235                 return UBUS_STATUS_UNKNOWN_ERROR;
 236 #endif
 237
 238         now = time(NULL);
 239
 240         if (!(tm = localtime(&now)))
 241                 return UBUS_STATUS_UNKNOWN_ERROR;
 242
 243         blob_buf_init(&b, 0);
 244
 245         blobmsg_add_u32(&b, "localtime", now + tm->tm_gmtoff);
 246
 247 #ifdef linux
 248         blobmsg_add_u32(&b, "uptime",    info.uptime);
 249
 250         c = blobmsg_open_array(&b, "load");
 251         blobmsg_add_u32(&b, NULL, info.loads[0]);
 252         blobmsg_add_u32(&b, NULL, info.loads[1]);
 253         blobmsg_add_u32(&b, NULL, info.loads[2]);
 254         blobmsg_close_array(&b, c);
 255
 256         c = blobmsg_open_table(&b, "memory");
 257         blobmsg_add_u64(&b, "total",
 258                         (uint64_t)info.mem_unit * (uint64_t)info.totalram);
 259         blobmsg_add_u64(&b, "free",
 260                         (uint64_t)info.mem_unit * (uint64_t)info.freeram);
 261         blobmsg_add_u64(&b, "shared",
 262                         (uint64_t)info.mem_unit * (uint64_t)info.sharedram);
 263         blobmsg_add_u64(&b, "buffered",
 264                         (uint64_t)info.mem_unit * (uint64_t)info.bufferram);
 265         blobmsg_close_table(&b, c);
 266
 267         c = blobmsg_open_table(&b, "swap");
 268         blobmsg_add_u64(&b, "total",
 269                         (uint64_t)info.mem_unit * (uint64_t)info.totalswap);
 270         blobmsg_add_u64(&b, "free",
 271                         (uint64_t)info.mem_unit * (uint64_t)info.freeswap);
 272         blobmsg_close_table(&b, c);
 273 #endif
 274
 275         ubus_send_reply(ctx, req, b.head);
 276
 277         return UBUS_STATUS_OK;
 278 }
 279
 280 static int system_reboot(struct ubus_context *ctx, struct ubus_object *obj,
 281                          struct ubus_request_data *req, const char *method,
 282                          struct blob_attr *msg)
 283 {
 284         procd_shutdown(RB_AUTOBOOT);
 285         return 0;
 286 }
 287
 288 enum {
 289         WDT_FREQUENCY,
 290         WDT_TIMEOUT,
 291         WDT_MAGICCLOSE,
 292         WDT_STOP,
 293         __WDT_MAX
 294 };
 295
 296 static const struct blobmsg_policy watchdog_policy[__WDT_MAX] = {
 297         [WDT_FREQUENCY] = { .name = "frequency", .type = BLOBMSG_TYPE_INT32 },
 298         [WDT_TIMEOUT] = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
 299         [WDT_MAGICCLOSE] = { .name = "magicclose", .type = BLOBMSG_TYPE_BOOL },
 300         [WDT_STOP] = { .name = "stop", .type = BLOBMSG_TYPE_BOOL },
 301 };
 302
 303 static int watchdog_set(struct ubus_context *ctx, struct ubus_object *obj,
 304                         struct ubus_request_data *req, const char *method,
 305                         struct blob_attr *msg)
 306 {
 307         struct blob_attr *tb[__WDT_MAX];
 308         const char *status;
 309
 310         if (!msg)
 311                 return UBUS_STATUS_INVALID_ARGUMENT;
 312
 313         blobmsg_parse(watchdog_policy, __WDT_MAX, tb, blob_data(msg), blob_len(msg));
 314         if (tb[WDT_FREQUENCY]) {
 315                 unsigned int timeout = tb[WDT_TIMEOUT] ? blobmsg_get_u32(tb[WDT_TIMEOUT]) :
 316                                                 watchdog_timeout(0);
 317                 unsigned int freq = blobmsg_get_u32(tb[WDT_FREQUENCY]);
 318
 319                 if (freq) {
 320                         if (freq > timeout / 2)
 321                                 freq = timeout / 2;
 322                         watchdog_frequency(freq);
 323                 }
 324         }
 325
 326         if (tb[WDT_TIMEOUT]) {
 327                 unsigned int timeout = blobmsg_get_u32(tb[WDT_TIMEOUT]);
 328                 unsigned int frequency = watchdog_frequency(0);
 329
 330                 if (timeout <= frequency)
 331                         timeout = frequency * 2;
 332                  watchdog_timeout(timeout);
 333         }
 334
 335         if (tb[WDT_MAGICCLOSE])
 336                 watchdog_set_magicclose(blobmsg_get_bool(tb[WDT_MAGICCLOSE]));
 337
 338         if (tb[WDT_STOP])
 339                 watchdog_set_stopped(blobmsg_get_bool(tb[WDT_STOP]));
 340
 341         if (watchdog_fd() == NULL)
 342                 status = "offline";
 343         else if (watchdog_get_stopped())
 344                 status = "stopped";
 345         else
 346                 status = "running";
 347
 348         blob_buf_init(&b, 0);
 349         blobmsg_add_string(&b, "status", status);
 350         blobmsg_add_u32(&b, "timeout", watchdog_timeout(0));
 351         blobmsg_add_u32(&b, "frequency", watchdog_frequency(0));
 352         blobmsg_add_u8(&b, "magicclose", watchdog_get_magicclose());
 353         ubus_send_reply(ctx, req, b.head);
 354
 355         return 0;
 356 }
 357
 358 enum {
 359         SIGNAL_PID,
 360         SIGNAL_NUM,
 361         __SIGNAL_MAX
 362 };
 363
 364 static const struct blobmsg_policy signal_policy[__SIGNAL_MAX] = {
 365         [SIGNAL_PID] = { .name = "pid", .type = BLOBMSG_TYPE_INT32 },
 366         [SIGNAL_NUM] = { .name = "signum", .type = BLOBMSG_TYPE_INT32 },
 367 };
 368
 369 static int proc_signal(struct ubus_context *ctx, struct ubus_object *obj,
 370                         struct ubus_request_data *req, const char *method,
 371                         struct blob_attr *msg)
 372 {
 373         struct blob_attr *tb[__SIGNAL_MAX];
 374
 375         if (!msg)
 376                 return UBUS_STATUS_INVALID_ARGUMENT;
 377
 378         blobmsg_parse(signal_policy, __SIGNAL_MAX, tb, blob_data(msg), blob_len(msg));
 379         if (!tb[SIGNAL_PID || !tb[SIGNAL_NUM]])
 380                 return UBUS_STATUS_INVALID_ARGUMENT;
 381
 382         kill(blobmsg_get_u32(tb[SIGNAL_PID]), blobmsg_get_u32(tb[SIGNAL_NUM]));
 383
 384         return 0;
 385 }
 386
 387 /**
 388  * validate_firmware_image_call - perform validation & store result in global b
 389  *
 390  * @file: firmware image path
 391  */
 392 static int validate_firmware_image_call(const char *file)
 393 {
 394         const char *path = "/usr/libexec/validate_firmware_image";
 395         json_object *jsobj = NULL;
 396         json_tokener *tok;
 397         char buf[64];
 398         ssize_t len;
 399         int fds[2];
 400         int err;
 401         int fd;
 402
 403         if (pipe(fds))
 404                 return -errno;
 405
 406         switch (fork()) {
 407         case -1:
 408                 return -errno;
 409         case 0:
 410                 /* Set stdin & stderr to /dev/null */
 411                 fd = open("/dev/null", O_RDWR);
 412                 if (fd >= 0) {
 413                         dup2(fd, 0);
 414                         dup2(fd, 2);
 415                         close(fd);
 416                 }
 417
 418                 /* Set stdout to the shared pipe */
 419                 dup2(fds[1], 1);
 420                 close(fds[0]);
 421                 close(fds[1]);
 422
 423                 execl(path, path, file, NULL);
 424                 exit(errno);
 425         }
 426
 427         /* Parent process */
 428
 429         tok = json_tokener_new();
 430         if (!tok) {
 431                 close(fds[0]);
 432                 close(fds[1]);
 433                 return -ENOMEM;
 434         }
 435
 436         blob_buf_init(&b, 0);
 437         while ((len = read(fds[0], buf, sizeof(buf)))) {
 438                 jsobj = json_tokener_parse_ex(tok, buf, len);
 439
 440                 if (json_tokener_get_error(tok) == json_tokener_success)
 441                         break;
 442                 else if (json_tokener_get_error(tok) == json_tokener_continue)
 443                         continue;
 444                 else
 445                         fprintf(stderr, "Failed to parse JSON: %d\n",
 446                                 json_tokener_get_error(tok));
 447         }
 448
 449         close(fds[0]);
 450         close(fds[1]);
 451
 452         err = -ENOENT;
 453         if (jsobj) {
 454                 if (json_object_get_type(jsobj) == json_type_object) {
 455                         blobmsg_add_object(&b, jsobj);
 456                         err = 0;
 457                 }
 458
 459                 json_object_put(jsobj);
 460         }
 461
 462         json_tokener_free(tok);
 463
 464         return err;
 465 }
 466
 467 enum {
 468         VALIDATE_FIRMWARE_IMAGE_PATH,
 469         __VALIDATE_FIRMWARE_IMAGE_MAX,
 470 };
 471
 472 static const struct blobmsg_policy validate_firmware_image_policy[__VALIDATE_FIRMWARE_IMAGE_MAX] = {
 473         [VALIDATE_FIRMWARE_IMAGE_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
 474 };
 475
 476 static int validate_firmware_image(struct ubus_context *ctx,
 477                                    struct ubus_object *obj,
 478                                    struct ubus_request_data *req,
 479                                    const char *method, struct blob_attr *msg)
 480 {
 481         struct blob_attr *tb[__VALIDATE_FIRMWARE_IMAGE_MAX];
 482
 483         if (!msg)
 484                 return UBUS_STATUS_INVALID_ARGUMENT;
 485
 486         blobmsg_parse(validate_firmware_image_policy, __VALIDATE_FIRMWARE_IMAGE_MAX, tb, blob_data(msg), blob_len(msg));
 487         if (!tb[VALIDATE_FIRMWARE_IMAGE_PATH])
 488                 return UBUS_STATUS_INVALID_ARGUMENT;
 489
 490         if (validate_firmware_image_call(blobmsg_get_string(tb[VALIDATE_FIRMWARE_IMAGE_PATH])))
 491                 return UBUS_STATUS_UNKNOWN_ERROR;
 492
 493         ubus_send_reply(ctx, req, b.head);
 494
 495         return UBUS_STATUS_OK;
 496 }
 497
 498 enum {
 499         SYSUPGRADE_PATH,
 500         SYSUPGRADE_FORCE,
 501         SYSUPGRADE_BACKUP,
 502         SYSUPGRADE_PREFIX,
 503         SYSUPGRADE_COMMAND,
 504         SYSUPGRADE_OPTIONS,
 505         __SYSUPGRADE_MAX
 506 };
 507
 508 static const struct blobmsg_policy sysupgrade_policy[__SYSUPGRADE_MAX] = {
 509         [SYSUPGRADE_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
 510         [SYSUPGRADE_FORCE] = { .name = "force", .type = BLOBMSG_TYPE_BOOL },
 511         [SYSUPGRADE_BACKUP] = { .name = "backup", .type = BLOBMSG_TYPE_STRING },
 512         [SYSUPGRADE_PREFIX] = { .name = "prefix", .type = BLOBMSG_TYPE_STRING },
 513         [SYSUPGRADE_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_STRING },
 514         [SYSUPGRADE_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_TABLE },
 515 };
 516
 517 static void sysupgrade_error(struct ubus_context *ctx,
 518                              struct ubus_request_data *req,
 519                              const char *message)
 520 {
 521         void *c;
 522
 523         blob_buf_init(&b, 0);
 524
 525         c = blobmsg_open_table(&b, "error");
 526         blobmsg_add_string(&b, "message", message);
 527         blobmsg_close_table(&b, c);
 528
 529         ubus_send_reply(ctx, req, b.head);
 530 }
 531
 532 static int sysupgrade(struct ubus_context *ctx, struct ubus_object *obj,
 533                       struct ubus_request_data *req, const char *method,
 534                       struct blob_attr *msg)
 535 {
 536         enum {
 537                 VALIDATION_VALID,
 538                 VALIDATION_FORCEABLE,
 539                 VALIDATION_ALLOW_BACKUP,
 540                 __VALIDATION_MAX
 541         };
 542         static const struct blobmsg_policy validation_policy[__VALIDATION_MAX] = {
 543                 [VALIDATION_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_BOOL },
 544                 [VALIDATION_FORCEABLE] = { .name = "forceable", .type = BLOBMSG_TYPE_BOOL },
 545                 [VALIDATION_ALLOW_BACKUP] = { .name = "allow_backup", .type = BLOBMSG_TYPE_BOOL },
 546         };
 547         struct blob_attr *validation[__VALIDATION_MAX];
 548         struct blob_attr *tb[__SYSUPGRADE_MAX];
 549         bool valid, forceable, allow_backup;
 550
 551         if (!msg)
 552                 return UBUS_STATUS_INVALID_ARGUMENT;
 553
 554         blobmsg_parse(sysupgrade_policy, __SYSUPGRADE_MAX, tb, blob_data(msg), blob_len(msg));
 555         if (!tb[SYSUPGRADE_PATH] || !tb[SYSUPGRADE_PREFIX])
 556                 return UBUS_STATUS_INVALID_ARGUMENT;
 557
 558         if (validate_firmware_image_call(blobmsg_get_string(tb[SYSUPGRADE_PATH]))) {
 559                 sysupgrade_error(ctx, req, "Firmware image couldn't be validated");
 560                 return UBUS_STATUS_UNKNOWN_ERROR;
 561         }
 562
 563         blobmsg_parse(validation_policy, __VALIDATION_MAX, validation, blob_data(b.head), blob_len(b.head));
 564
 565         valid = validation[VALIDATION_VALID] && blobmsg_get_bool(validation[VALIDATION_VALID]);
 566         forceable = validation[VALIDATION_FORCEABLE] && blobmsg_get_bool(validation[VALIDATION_FORCEABLE]);
 567         allow_backup = validation[VALIDATION_ALLOW_BACKUP] && blobmsg_get_bool(validation[VALIDATION_ALLOW_BACKUP]);
 568
 569         if (!valid) {
 570                 if (!forceable) {
 571                         sysupgrade_error(ctx, req, "Firmware image is broken and cannot be installed");
 572                         return UBUS_STATUS_NOT_SUPPORTED;
 573                 } else if (!tb[SYSUPGRADE_FORCE] || !blobmsg_get_bool(tb[SYSUPGRADE_FORCE])) {
 574                         sysupgrade_error(ctx, req, "Firmware image is invalid");
 575                         return UBUS_STATUS_NOT_SUPPORTED;
 576                 }
 577         } else if (!allow_backup && tb[SYSUPGRADE_BACKUP]) {
 578                 sysupgrade_error(ctx, req, "Firmware image doesn't allow preserving a backup");
 579                 return UBUS_STATUS_NOT_SUPPORTED;
 580         }
 581
 582         sysupgrade_exec_upgraded(blobmsg_get_string(tb[SYSUPGRADE_PREFIX]),
 583                                  blobmsg_get_string(tb[SYSUPGRADE_PATH]),
 584                                  tb[SYSUPGRADE_BACKUP] ? blobmsg_get_string(tb[SYSUPGRADE_BACKUP]) : NULL,
 585                                  tb[SYSUPGRADE_COMMAND] ? blobmsg_get_string(tb[SYSUPGRADE_COMMAND]) : NULL,
 586                                  tb[SYSUPGRADE_OPTIONS]);
 587
 588         /* sysupgrade_exec_upgraded() will never return unless something has gone wrong */
 589         return UBUS_STATUS_UNKNOWN_ERROR;
 590 }
 591
 592 static void
 593 procd_subscribe_cb(struct ubus_context *ctx, struct ubus_object *obj)
 594 {
 595         notify = obj->has_subscribers;
 596 }
 597
 598
 599 static const struct ubus_method system_methods[] = {
 600         UBUS_METHOD_NOARG("board", system_board),
 601         UBUS_METHOD_NOARG("info",  system_info),
 602         UBUS_METHOD_NOARG("reboot", system_reboot),
 603         UBUS_METHOD("watchdog", watchdog_set, watchdog_policy),
 604         UBUS_METHOD("signal", proc_signal, signal_policy),
 605         UBUS_METHOD("validate_firmware_image", validate_firmware_image, validate_firmware_image_policy),
 606         UBUS_METHOD("sysupgrade", sysupgrade, sysupgrade_policy),
 607 };
 608
 609 static struct ubus_object_type system_object_type =
 610         UBUS_OBJECT_TYPE("system", system_methods);
 611
 612 static struct ubus_object system_object = {
 613         .name = "system",
 614         .type = &system_object_type,
 615         .methods = system_methods,
 616         .n_methods = ARRAY_SIZE(system_methods),
 617         .subscribe_cb = procd_subscribe_cb,
 618 };
 619
 620 void
 621 procd_bcast_event(char *event, struct blob_attr *msg)
 622 {
 623         int ret;
 624
 625         if (!notify)
 626                 return;
 627
 628         ret = ubus_notify(_ctx, &system_object, event, msg, -1);
 629         if (ret)
 630                 fprintf(stderr, "Failed to notify log: %s\n", ubus_strerror(ret));
 631 }
 632
 633 void ubus_init_system(struct ubus_context *ctx)
 634 {
 635         int ret;
 636
 637         _ctx = ctx;
 638         ret = ubus_add_object(ctx, &system_object);
 639         if (ret)
 640                 ERROR("Failed to add object: %s\n", ubus_strerror(ret));
 641 }