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 <libubox/uloop.h>
  29
  30 #include "procd.h"
  31 #include "watchdog.h"
  32
  33 static struct blob_buf b;
  34 static int notify;
  35 static struct ubus_context *_ctx;
  36
  37 int upgrade_running = 0;
  38
  39 static int system_board(struct ubus_context *ctx, struct ubus_object *obj,
  40                  struct ubus_request_data *req, const char *method,
  41                  struct blob_attr *msg)
  42 {
  43         void *c;
  44         char line[256];
  45         char *key, *val, *next;
  46         struct utsname utsname;
  47         FILE *f;
  48
  49         blob_buf_init(&b, 0);
  50
  51         if (uname(&utsname) >= 0)
  52         {
  53                 blobmsg_add_string(&b, "kernel", utsname.release);
  54                 blobmsg_add_string(&b, "hostname", utsname.nodename);
  55         }
  56
  57         if ((f = fopen("/proc/cpuinfo", "r")) != NULL)
  58         {
  59                 while(fgets(line, sizeof(line), f))
  60                 {
  61                         key = strtok(line, "\t:");
  62                         val = strtok(NULL, "\t\n");
  63
  64                         if (!key || !val)
  65                                 continue;
  66
  67                         if (!strcasecmp(key, "system type") ||
  68                             !strcasecmp(key, "processor") ||
  69                             !strcasecmp(key, "model name"))
  70                         {
  71                                 strtoul(val + 2, &key, 0);
  72
  73                                 if (key == (val + 2) || *key != 0)
  74                                 {
  75                                         blobmsg_add_string(&b, "system", val + 2);
  76                                         break;
  77                                 }
  78                         }
  79                 }
  80
  81                 fclose(f);
  82         }
  83
  84         if ((f = fopen("/tmp/sysinfo/model", "r")) != NULL ||
  85             (f = fopen("/proc/device-tree/model", "r")) != NULL)
  86         {
  87                 if (fgets(line, sizeof(line), f))
  88                 {
  89                         val = strtok(line, "\t\n");
  90
  91                         if (val)
  92                                 blobmsg_add_string(&b, "model", val);
  93                 }
  94
  95                 fclose(f);
  96         }
  97         else if ((f = fopen("/proc/cpuinfo", "r")) != NULL)
  98         {
  99                 while(fgets(line, sizeof(line), f))
 100                 {
 101                         key = strtok(line, "\t:");
 102                         val = strtok(NULL, "\t\n");
 103
 104                         if (!key || !val)
 105                                 continue;
 106
 107                         if (!strcasecmp(key, "machine") ||
 108                             !strcasecmp(key, "hardware"))
 109                         {
 110                                 blobmsg_add_string(&b, "model", val + 2);
 111                                 break;
 112                         }
 113                 }
 114
 115                 fclose(f);
 116         }
 117
 118         if ((f = fopen("/etc/openwrt_release", "r")) != NULL)
 119         {
 120                 c = blobmsg_open_table(&b, "release");
 121
 122                 while (fgets(line, sizeof(line), f))
 123                 {
 124                         char *dest;
 125                         char ch;
 126
 127                         key = line;
 128                         val = strchr(line, '=');
 129                         if (!val)
 130                                 continue;
 131
 132                         *(val++) = 0;
 133
 134                         if (!strcasecmp(key, "DISTRIB_ID"))
 135                                 key = "distribution";
 136                         else if (!strcasecmp(key, "DISTRIB_RELEASE"))
 137                                 key = "version";
 138                         else if (!strcasecmp(key, "DISTRIB_REVISION"))
 139                                 key = "revision";
 140                         else if (!strcasecmp(key, "DISTRIB_CODENAME"))
 141                                 key = "codename";
 142                         else if (!strcasecmp(key, "DISTRIB_TARGET"))
 143                                 key = "target";
 144                         else if (!strcasecmp(key, "DISTRIB_DESCRIPTION"))
 145                                 key = "description";
 146                         else
 147                                 continue;
 148
 149                         dest = blobmsg_alloc_string_buffer(&b, key, strlen(val));
 150                         if (!dest) {
 151                                 ERROR("Failed to allocate blob.\n");
 152                                 continue;
 153                         }
 154
 155                         while (val && (ch = *(val++)) != 0) {
 156                                 switch (ch) {
 157                                 case '\'':
 158                                 case '"':
 159                                         next = strchr(val, ch);
 160                                         if (next)
 161                                                 *next = 0;
 162
 163                                         strcpy(dest, val);
 164
 165                                         if (next)
 166                                                 val = next + 1;
 167
 168                                         dest += strlen(dest);
 169                                         break;
 170                                 case '\\':
 171                                         *(dest++) = *(val++);
 172                                         break;
 173                                 }
 174                         }
 175                         blobmsg_add_string_buffer(&b);
 176                 }
 177
 178                 blobmsg_close_array(&b, c);
 179
 180                 fclose(f);
 181         }
 182
 183         ubus_send_reply(ctx, req, b.head);
 184
 185         return UBUS_STATUS_OK;
 186 }
 187
 188 static int system_info(struct ubus_context *ctx, struct ubus_object *obj,
 189                 struct ubus_request_data *req, const char *method,
 190                 struct blob_attr *msg)
 191 {
 192         time_t now;
 193         struct tm *tm;
 194 #ifdef linux
 195         struct sysinfo info;
 196         void *c;
 197
 198         if (sysinfo(&info))
 199                 return UBUS_STATUS_UNKNOWN_ERROR;
 200 #endif
 201
 202         now = time(NULL);
 203
 204         if (!(tm = localtime(&now)))
 205                 return UBUS_STATUS_UNKNOWN_ERROR;
 206
 207         blob_buf_init(&b, 0);
 208
 209         blobmsg_add_u32(&b, "localtime", now + tm->tm_gmtoff);
 210
 211 #ifdef linux
 212         blobmsg_add_u32(&b, "uptime",    info.uptime);
 213
 214         c = blobmsg_open_array(&b, "load");
 215         blobmsg_add_u32(&b, NULL, info.loads[0]);
 216         blobmsg_add_u32(&b, NULL, info.loads[1]);
 217         blobmsg_add_u32(&b, NULL, info.loads[2]);
 218         blobmsg_close_array(&b, c);
 219
 220         c = blobmsg_open_table(&b, "memory");
 221         blobmsg_add_u64(&b, "total",    info.mem_unit * info.totalram);
 222         blobmsg_add_u64(&b, "free",     info.mem_unit * info.freeram);
 223         blobmsg_add_u64(&b, "shared",   info.mem_unit * info.sharedram);
 224         blobmsg_add_u64(&b, "buffered", info.mem_unit * info.bufferram);
 225         blobmsg_close_table(&b, c);
 226
 227         c = blobmsg_open_table(&b, "swap");
 228         blobmsg_add_u64(&b, "total",    info.mem_unit * info.totalswap);
 229         blobmsg_add_u64(&b, "free",     info.mem_unit * info.freeswap);
 230         blobmsg_close_table(&b, c);
 231 #endif
 232
 233         ubus_send_reply(ctx, req, b.head);
 234
 235         return UBUS_STATUS_OK;
 236 }
 237
 238 static int system_upgrade(struct ubus_context *ctx, struct ubus_object *obj,
 239                         struct ubus_request_data *req, const char *method,
 240                         struct blob_attr *msg)
 241 {
 242         upgrade_running = 1;
 243         return 0;
 244 }
 245
 246 static int system_reboot(struct ubus_context *ctx, struct ubus_object *obj,
 247                          struct ubus_request_data *req, const char *method,
 248                          struct blob_attr *msg)
 249 {
 250         procd_shutdown(RB_AUTOBOOT);
 251         return 0;
 252 }
 253
 254 enum {
 255         WDT_FREQUENCY,
 256         WDT_TIMEOUT,
 257         WDT_STOP,
 258         __WDT_MAX
 259 };
 260
 261 static const struct blobmsg_policy watchdog_policy[__WDT_MAX] = {
 262         [WDT_FREQUENCY] = { .name = "frequency", .type = BLOBMSG_TYPE_INT32 },
 263         [WDT_TIMEOUT] = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
 264         [WDT_STOP] = { .name = "stop", .type = BLOBMSG_TYPE_BOOL },
 265 };
 266
 267 static int watchdog_set(struct ubus_context *ctx, struct ubus_object *obj,
 268                         struct ubus_request_data *req, const char *method,
 269                         struct blob_attr *msg)
 270 {
 271         struct blob_attr *tb[__WDT_MAX];
 272         const char *status;
 273
 274         if (!msg)
 275                 return UBUS_STATUS_INVALID_ARGUMENT;
 276
 277         blobmsg_parse(watchdog_policy, __WDT_MAX, tb, blob_data(msg), blob_len(msg));
 278         if (tb[WDT_FREQUENCY]) {
 279                 unsigned int timeout = watchdog_timeout(0);
 280                 unsigned int freq = blobmsg_get_u32(tb[WDT_FREQUENCY]);
 281
 282                 if (freq) {
 283                         if (freq > timeout / 2)
 284                                 freq = timeout / 2;
 285                         watchdog_frequency(freq);
 286                 }
 287         }
 288
 289         if (tb[WDT_TIMEOUT]) {
 290                 unsigned int timeout = blobmsg_get_u32(tb[WDT_TIMEOUT]);
 291                 unsigned int frequency = watchdog_frequency(0);
 292
 293                 if (timeout <= frequency)
 294                         timeout = frequency * 2;
 295                  watchdog_timeout(timeout);
 296         }
 297
 298         if (tb[WDT_STOP])
 299                 watchdog_set_stopped(blobmsg_get_bool(tb[WDT_STOP]));
 300
 301         if (watchdog_fd() == NULL)
 302                 status = "offline";
 303         else if (watchdog_get_stopped())
 304                 status = "stopped";
 305         else
 306                 status = "running";
 307
 308         blob_buf_init(&b, 0);
 309         blobmsg_add_string(&b, "status", status);
 310         blobmsg_add_u32(&b, "timeout", watchdog_timeout(0));
 311         blobmsg_add_u32(&b, "frequency", watchdog_frequency(0));
 312         ubus_send_reply(ctx, req, b.head);
 313
 314         return 0;
 315 }
 316
 317 enum {
 318         SIGNAL_PID,
 319         SIGNAL_NUM,
 320         __SIGNAL_MAX
 321 };
 322
 323 static const struct blobmsg_policy signal_policy[__SIGNAL_MAX] = {
 324         [SIGNAL_PID] = { .name = "pid", .type = BLOBMSG_TYPE_INT32 },
 325         [SIGNAL_NUM] = { .name = "signum", .type = BLOBMSG_TYPE_INT32 },
 326 };
 327
 328 static int proc_signal(struct ubus_context *ctx, struct ubus_object *obj,
 329                         struct ubus_request_data *req, const char *method,
 330                         struct blob_attr *msg)
 331 {
 332         struct blob_attr *tb[__SIGNAL_MAX];
 333
 334         if (!msg)
 335                 return UBUS_STATUS_INVALID_ARGUMENT;
 336
 337         blobmsg_parse(signal_policy, __SIGNAL_MAX, tb, blob_data(msg), blob_len(msg));
 338         if (!tb[SIGNAL_PID || !tb[SIGNAL_NUM]])
 339                 return UBUS_STATUS_INVALID_ARGUMENT;
 340
 341         kill(blobmsg_get_u32(tb[SIGNAL_PID]), blobmsg_get_u32(tb[SIGNAL_NUM]));
 342
 343         return 0;
 344 }
 345
 346 enum {
 347         SYSUPGRADE_PATH,
 348         SYSUPGRADE_PREFIX,
 349         SYSUPGRADE_COMMAND,
 350         __SYSUPGRADE_MAX
 351 };
 352
 353 static const struct blobmsg_policy sysupgrade_policy[__SYSUPGRADE_MAX] = {
 354         [SYSUPGRADE_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
 355         [SYSUPGRADE_PREFIX] = { .name = "prefix", .type = BLOBMSG_TYPE_STRING },
 356         [SYSUPGRADE_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_STRING },
 357 };
 358
 359 static void
 360 procd_exec_upgraded(const char *prefix, char *path, char *command)
 361 {
 362         char *wdt_fd = watchdog_fd();
 363         char *argv[] = { "/sbin/upgraded", NULL, NULL, NULL};
 364
 365         if (chroot(prefix)) {
 366                 fprintf(stderr, "Failed to chroot for upgraded exec.\n");
 367                 return;
 368         }
 369
 370         argv[1] = path;
 371         argv[2] = command;
 372
 373         DEBUG(2, "Exec to upgraded now\n");
 374         if (wdt_fd) {
 375                 watchdog_set_cloexec(false);
 376                 setenv("WDTFD", wdt_fd, 1);
 377         }
 378         execvp(argv[0], argv);
 379
 380         /* Cleanup on failure */
 381         fprintf(stderr, "Failed to exec upgraded.\n");
 382         unsetenv("WDTFD");
 383         watchdog_set_cloexec(true);
 384         chroot(".");
 385 }
 386
 387 static int sysupgrade(struct ubus_context *ctx, struct ubus_object *obj,
 388                       struct ubus_request_data *req, const char *method,
 389                       struct blob_attr *msg)
 390 {
 391         struct blob_attr *tb[__SYSUPGRADE_MAX];
 392
 393         if (!msg)
 394                 return UBUS_STATUS_INVALID_ARGUMENT;
 395
 396         blobmsg_parse(sysupgrade_policy, __SYSUPGRADE_MAX, tb, blob_data(msg), blob_len(msg));
 397         if (!tb[SYSUPGRADE_PATH] || !tb[SYSUPGRADE_PREFIX])
 398                 return UBUS_STATUS_INVALID_ARGUMENT;
 399
 400         procd_exec_upgraded(blobmsg_get_string(tb[SYSUPGRADE_PREFIX]),
 401                             blobmsg_get_string(tb[SYSUPGRADE_PATH]),
 402                             tb[SYSUPGRADE_COMMAND] ? blobmsg_get_string(tb[SYSUPGRADE_COMMAND]) : NULL);
 403         return 0;
 404 }
 405
 406 static void
 407 procd_subscribe_cb(struct ubus_context *ctx, struct ubus_object *obj)
 408 {
 409         notify = obj->has_subscribers;
 410 }
 411
 412
 413 static const struct ubus_method system_methods[] = {
 414         UBUS_METHOD_NOARG("board", system_board),
 415         UBUS_METHOD_NOARG("info",  system_info),
 416         UBUS_METHOD_NOARG("upgrade", system_upgrade),
 417         UBUS_METHOD_NOARG("reboot", system_reboot),
 418         UBUS_METHOD("watchdog", watchdog_set, watchdog_policy),
 419         UBUS_METHOD("signal", proc_signal, signal_policy),
 420         UBUS_METHOD("nandupgrade", sysupgrade, sysupgrade_policy),
 421         UBUS_METHOD("sysupgrade", sysupgrade, sysupgrade_policy),
 422 };
 423
 424 static struct ubus_object_type system_object_type =
 425         UBUS_OBJECT_TYPE("system", system_methods);
 426
 427 static struct ubus_object system_object = {
 428         .name = "system",
 429         .type = &system_object_type,
 430         .methods = system_methods,
 431         .n_methods = ARRAY_SIZE(system_methods),
 432         .subscribe_cb = procd_subscribe_cb,
 433 };
 434
 435 void
 436 procd_bcast_event(char *event, struct blob_attr *msg)
 437 {
 438         int ret;
 439
 440         if (!notify)
 441                 return;
 442
 443         ret = ubus_notify(_ctx, &system_object, event, msg, -1);
 444         if (ret)
 445                 fprintf(stderr, "Failed to notify log: %s\n", ubus_strerror(ret));
 446 }
 447
 448 void ubus_init_system(struct ubus_context *ctx)
 449 {
 450         int ret;
 451
 452         _ctx = ctx;
 453         ret = ubus_add_object(ctx, &system_object);
 454         if (ret)
 455                 ERROR("Failed to add object: %s\n", ubus_strerror(ret));
 456 }