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",    info.mem_unit * info.totalram);
 258         blobmsg_add_u64(&b, "free",     info.mem_unit * info.freeram);
 259         blobmsg_add_u64(&b, "shared",   info.mem_unit * info.sharedram);
 260         blobmsg_add_u64(&b, "buffered", info.mem_unit * info.bufferram);
 261         blobmsg_close_table(&b, c);
 262
 263         c = blobmsg_open_table(&b, "swap");
 264         blobmsg_add_u64(&b, "total",    info.mem_unit * info.totalswap);
 265         blobmsg_add_u64(&b, "free",     info.mem_unit * info.freeswap);
 266         blobmsg_close_table(&b, c);
 267 #endif
 268
 269         ubus_send_reply(ctx, req, b.head);
 270
 271         return UBUS_STATUS_OK;
 272 }
 273
 274 static int system_reboot(struct ubus_context *ctx, struct ubus_object *obj,
 275                          struct ubus_request_data *req, const char *method,
 276                          struct blob_attr *msg)
 277 {
 278         procd_shutdown(RB_AUTOBOOT);
 279         return 0;
 280 }
 281
 282 enum {
 283         WDT_FREQUENCY,
 284         WDT_TIMEOUT,
 285         WDT_MAGICCLOSE,
 286         WDT_STOP,
 287         __WDT_MAX
 288 };
 289
 290 static const struct blobmsg_policy watchdog_policy[__WDT_MAX] = {
 291         [WDT_FREQUENCY] = { .name = "frequency", .type = BLOBMSG_TYPE_INT32 },
 292         [WDT_TIMEOUT] = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
 293         [WDT_MAGICCLOSE] = { .name = "magicclose", .type = BLOBMSG_TYPE_BOOL },
 294         [WDT_STOP] = { .name = "stop", .type = BLOBMSG_TYPE_BOOL },
 295 };
 296
 297 static int watchdog_set(struct ubus_context *ctx, struct ubus_object *obj,
 298                         struct ubus_request_data *req, const char *method,
 299                         struct blob_attr *msg)
 300 {
 301         struct blob_attr *tb[__WDT_MAX];
 302         const char *status;
 303
 304         if (!msg)
 305                 return UBUS_STATUS_INVALID_ARGUMENT;
 306
 307         blobmsg_parse(watchdog_policy, __WDT_MAX, tb, blob_data(msg), blob_len(msg));
 308         if (tb[WDT_FREQUENCY]) {
 309                 unsigned int timeout = tb[WDT_TIMEOUT] ? blobmsg_get_u32(tb[WDT_TIMEOUT]) :
 310                                                 watchdog_timeout(0);
 311                 unsigned int freq = blobmsg_get_u32(tb[WDT_FREQUENCY]);
 312
 313                 if (freq) {
 314                         if (freq > timeout / 2)
 315                                 freq = timeout / 2;
 316                         watchdog_frequency(freq);
 317                 }
 318         }
 319
 320         if (tb[WDT_TIMEOUT]) {
 321                 unsigned int timeout = blobmsg_get_u32(tb[WDT_TIMEOUT]);
 322                 unsigned int frequency = watchdog_frequency(0);
 323
 324                 if (timeout <= frequency)
 325                         timeout = frequency * 2;
 326                  watchdog_timeout(timeout);
 327         }
 328
 329         if (tb[WDT_MAGICCLOSE])
 330                 watchdog_set_magicclose(blobmsg_get_bool(tb[WDT_MAGICCLOSE]));
 331
 332         if (tb[WDT_STOP])
 333                 watchdog_set_stopped(blobmsg_get_bool(tb[WDT_STOP]));
 334
 335         if (watchdog_fd() == NULL)
 336                 status = "offline";
 337         else if (watchdog_get_stopped())
 338                 status = "stopped";
 339         else
 340                 status = "running";
 341
 342         blob_buf_init(&b, 0);
 343         blobmsg_add_string(&b, "status", status);
 344         blobmsg_add_u32(&b, "timeout", watchdog_timeout(0));
 345         blobmsg_add_u32(&b, "frequency", watchdog_frequency(0));
 346         blobmsg_add_u8(&b, "magicclose", watchdog_get_magicclose());
 347         ubus_send_reply(ctx, req, b.head);
 348
 349         return 0;
 350 }
 351
 352 enum {
 353         SIGNAL_PID,
 354         SIGNAL_NUM,
 355         __SIGNAL_MAX
 356 };
 357
 358 static const struct blobmsg_policy signal_policy[__SIGNAL_MAX] = {
 359         [SIGNAL_PID] = { .name = "pid", .type = BLOBMSG_TYPE_INT32 },
 360         [SIGNAL_NUM] = { .name = "signum", .type = BLOBMSG_TYPE_INT32 },
 361 };
 362
 363 static int proc_signal(struct ubus_context *ctx, struct ubus_object *obj,
 364                         struct ubus_request_data *req, const char *method,
 365                         struct blob_attr *msg)
 366 {
 367         struct blob_attr *tb[__SIGNAL_MAX];
 368
 369         if (!msg)
 370                 return UBUS_STATUS_INVALID_ARGUMENT;
 371
 372         blobmsg_parse(signal_policy, __SIGNAL_MAX, tb, blob_data(msg), blob_len(msg));
 373         if (!tb[SIGNAL_PID || !tb[SIGNAL_NUM]])
 374                 return UBUS_STATUS_INVALID_ARGUMENT;
 375
 376         kill(blobmsg_get_u32(tb[SIGNAL_PID]), blobmsg_get_u32(tb[SIGNAL_NUM]));
 377
 378         return 0;
 379 }
 380
 381 /**
 382  * validate_firmware_image_call - perform validation & store result in global b
 383  *
 384  * @file: firmware image path
 385  */
 386 static int validate_firmware_image_call(const char *file)
 387 {
 388         const char *path = "/usr/libexec/validate_firmware_image";
 389         json_object *jsobj = NULL;
 390         json_tokener *tok;
 391         char buf[64];
 392         ssize_t len;
 393         int fds[2];
 394         int err;
 395         int fd;
 396
 397         if (pipe(fds))
 398                 return -errno;
 399
 400         switch (fork()) {
 401         case -1:
 402                 return -errno;
 403         case 0:
 404                 /* Set stdin & stderr to /dev/null */
 405                 fd = open("/dev/null", O_RDWR);
 406                 if (fd >= 0) {
 407                         dup2(fd, 0);
 408                         dup2(fd, 2);
 409                         close(fd);
 410                 }
 411
 412                 /* Set stdout to the shared pipe */
 413                 dup2(fds[1], 1);
 414                 close(fds[0]);
 415                 close(fds[1]);
 416
 417                 execl(path, path, file, NULL);
 418                 exit(errno);
 419         }
 420
 421         /* Parent process */
 422
 423         tok = json_tokener_new();
 424         if (!tok) {
 425                 close(fds[0]);
 426                 close(fds[1]);
 427                 return -ENOMEM;
 428         }
 429
 430         blob_buf_init(&b, 0);
 431         while ((len = read(fds[0], buf, sizeof(buf)))) {
 432                 jsobj = json_tokener_parse_ex(tok, buf, len);
 433
 434                 if (json_tokener_get_error(tok) == json_tokener_success)
 435                         break;
 436                 else if (json_tokener_get_error(tok) == json_tokener_continue)
 437                         continue;
 438                 else
 439                         fprintf(stderr, "Failed to parse JSON: %d\n",
 440                                 json_tokener_get_error(tok));
 441         }
 442
 443         close(fds[0]);
 444         close(fds[1]);
 445
 446         err = -ENOENT;
 447         if (jsobj) {
 448                 if (json_object_get_type(jsobj) == json_type_object) {
 449                         blobmsg_add_object(&b, jsobj);
 450                         err = 0;
 451                 }
 452
 453                 json_object_put(jsobj);
 454         }
 455
 456         json_tokener_free(tok);
 457
 458         return err;
 459 }
 460
 461 enum {
 462         VALIDATE_FIRMWARE_IMAGE_PATH,
 463         __VALIDATE_FIRMWARE_IMAGE_MAX,
 464 };
 465
 466 static const struct blobmsg_policy validate_firmware_image_policy[__VALIDATE_FIRMWARE_IMAGE_MAX] = {
 467         [VALIDATE_FIRMWARE_IMAGE_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
 468 };
 469
 470 static int validate_firmware_image(struct ubus_context *ctx,
 471                                    struct ubus_object *obj,
 472                                    struct ubus_request_data *req,
 473                                    const char *method, struct blob_attr *msg)
 474 {
 475         struct blob_attr *tb[__VALIDATE_FIRMWARE_IMAGE_MAX];
 476
 477         if (!msg)
 478                 return UBUS_STATUS_INVALID_ARGUMENT;
 479
 480         blobmsg_parse(validate_firmware_image_policy, __VALIDATE_FIRMWARE_IMAGE_MAX, tb, blob_data(msg), blob_len(msg));
 481         if (!tb[VALIDATE_FIRMWARE_IMAGE_PATH])
 482                 return UBUS_STATUS_INVALID_ARGUMENT;
 483
 484         if (validate_firmware_image_call(blobmsg_get_string(tb[VALIDATE_FIRMWARE_IMAGE_PATH])))
 485                 return UBUS_STATUS_UNKNOWN_ERROR;
 486
 487         ubus_send_reply(ctx, req, b.head);
 488
 489         return UBUS_STATUS_OK;
 490 }
 491
 492 enum {
 493         SYSUPGRADE_PATH,
 494         SYSUPGRADE_FORCE,
 495         SYSUPGRADE_PREFIX,
 496         SYSUPGRADE_COMMAND,
 497         SYSUPGRADE_OPTIONS,
 498         __SYSUPGRADE_MAX
 499 };
 500
 501 static const struct blobmsg_policy sysupgrade_policy[__SYSUPGRADE_MAX] = {
 502         [SYSUPGRADE_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
 503         [SYSUPGRADE_FORCE] = { .name = "force", .type = BLOBMSG_TYPE_BOOL },
 504         [SYSUPGRADE_PREFIX] = { .name = "prefix", .type = BLOBMSG_TYPE_STRING },
 505         [SYSUPGRADE_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_STRING },
 506         [SYSUPGRADE_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_TABLE },
 507 };
 508
 509 static int sysupgrade(struct ubus_context *ctx, struct ubus_object *obj,
 510                       struct ubus_request_data *req, const char *method,
 511                       struct blob_attr *msg)
 512 {
 513         enum {
 514                 VALIDATION_VALID,
 515                 VALIDATION_FORCEABLE,
 516                 __VALIDATION_MAX
 517         };
 518         static const struct blobmsg_policy validation_policy[__VALIDATION_MAX] = {
 519                 [VALIDATION_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_BOOL },
 520                 [VALIDATION_FORCEABLE] = { .name = "forceable", .type = BLOBMSG_TYPE_BOOL },
 521         };
 522         struct blob_attr *validation[__VALIDATION_MAX];
 523         struct blob_attr *tb[__SYSUPGRADE_MAX];
 524         bool valid, forceable;
 525
 526         if (!msg)
 527                 return UBUS_STATUS_INVALID_ARGUMENT;
 528
 529         blobmsg_parse(sysupgrade_policy, __SYSUPGRADE_MAX, tb, blob_data(msg), blob_len(msg));
 530         if (!tb[SYSUPGRADE_PATH] || !tb[SYSUPGRADE_PREFIX])
 531                 return UBUS_STATUS_INVALID_ARGUMENT;
 532
 533         if (validate_firmware_image_call(blobmsg_get_string(tb[SYSUPGRADE_PATH])))
 534                 return UBUS_STATUS_UNKNOWN_ERROR;
 535
 536         blobmsg_parse(validation_policy, __VALIDATION_MAX, validation, blob_data(b.head), blob_len(b.head));
 537
 538         valid = validation[VALIDATION_VALID] && blobmsg_get_bool(validation[VALIDATION_VALID]);
 539         forceable = validation[VALIDATION_FORCEABLE] && blobmsg_get_bool(validation[VALIDATION_FORCEABLE]);
 540
 541         if (!valid) {
 542                 if (!forceable) {
 543                         fprintf(stderr, "Firmware image is broken and cannot be installed\n");
 544                         return UBUS_STATUS_NOT_SUPPORTED;
 545                 } else if (!tb[SYSUPGRADE_FORCE] || !blobmsg_get_bool(tb[SYSUPGRADE_FORCE])) {
 546                         fprintf(stderr, "Firmware image is invalid\n");
 547                         return UBUS_STATUS_NOT_SUPPORTED;
 548                 }
 549         }
 550
 551         sysupgrade_exec_upgraded(blobmsg_get_string(tb[SYSUPGRADE_PREFIX]),
 552                                  blobmsg_get_string(tb[SYSUPGRADE_PATH]),
 553                                  tb[SYSUPGRADE_COMMAND] ? blobmsg_get_string(tb[SYSUPGRADE_COMMAND]) : NULL,
 554                                  tb[SYSUPGRADE_OPTIONS]);
 555
 556         /* sysupgrade_exec_upgraded() will never return unless something has gone wrong */
 557         return UBUS_STATUS_UNKNOWN_ERROR;
 558 }
 559
 560 static void
 561 procd_subscribe_cb(struct ubus_context *ctx, struct ubus_object *obj)
 562 {
 563         notify = obj->has_subscribers;
 564 }
 565
 566
 567 static const struct ubus_method system_methods[] = {
 568         UBUS_METHOD_NOARG("board", system_board),
 569         UBUS_METHOD_NOARG("info",  system_info),
 570         UBUS_METHOD_NOARG("reboot", system_reboot),
 571         UBUS_METHOD("watchdog", watchdog_set, watchdog_policy),
 572         UBUS_METHOD("signal", proc_signal, signal_policy),
 573         UBUS_METHOD("validate_firmware_image", validate_firmware_image, validate_firmware_image_policy),
 574         UBUS_METHOD("sysupgrade", sysupgrade, sysupgrade_policy),
 575 };
 576
 577 static struct ubus_object_type system_object_type =
 578         UBUS_OBJECT_TYPE("system", system_methods);
 579
 580 static struct ubus_object system_object = {
 581         .name = "system",
 582         .type = &system_object_type,
 583         .methods = system_methods,
 584         .n_methods = ARRAY_SIZE(system_methods),
 585         .subscribe_cb = procd_subscribe_cb,
 586 };
 587
 588 void
 589 procd_bcast_event(char *event, struct blob_attr *msg)
 590 {
 591         int ret;
 592
 593         if (!notify)
 594                 return;
 595
 596         ret = ubus_notify(_ctx, &system_object, event, msg, -1);
 597         if (ret)
 598                 fprintf(stderr, "Failed to notify log: %s\n", ubus_strerror(ret));
 599 }
 600
 601 void ubus_init_system(struct ubus_context *ctx)
 602 {
 603         int ret;
 604
 605         _ctx = ctx;
 606         ret = ubus_add_object(ctx, &system_object);
 607         if (ret)
 608                 ERROR("Failed to add object: %s\n", ubus_strerror(ret));
 609 }