git.ozlabs.org Git - petitboot/blob - discover/device-handler.c

   1 #include <assert.h>
   2 #include <stdlib.h>
   3 #include <stdbool.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6 #include <errno.h>
   7 #include <mntent.h>
   8 #include <locale.h>
   9 #include <sys/stat.h>
  10 #include <sys/wait.h>
  11 #include <sys/mount.h>
  12
  13 #include <talloc/talloc.h>
  14 #include <list/list.h>
  15 #include <log/log.h>
  16 #include <types/types.h>
  17 #include <system/system.h>
  18 #include <process/process.h>
  19 #include <url/url.h>
  20 #include <i18n/i18n.h>
  21
  22 #include <sys/types.h>
  23 #include <sys/socket.h>
  24 #include <netdb.h>
  25 #include <arpa/inet.h>
  26
  27 #include "device-handler.h"
  28 #include "discover-server.h"
  29 #include "devmapper.h"
  30 #include "user-event.h"
  31 #include "platform.h"
  32 #include "event.h"
  33 #include "parser.h"
  34 #include "resource.h"
  35 #include "paths.h"
  36 #include "sysinfo.h"
  37 #include "boot.h"
  38 #include "udev.h"
  39 #include "network.h"
  40 #include "ipmi.h"
  41
  42 enum default_priority {
  43         DEFAULT_PRIORITY_REMOTE         = 1,
  44         DEFAULT_PRIORITY_LOCAL_FIRST    = 2,
  45         DEFAULT_PRIORITY_LOCAL_LAST     = 0xfe,
  46         DEFAULT_PRIORITY_DISABLED       = 0xff,
  47 };
  48
  49 struct device_handler {
  50         struct discover_server  *server;
  51         int                     dry_run;
  52
  53         struct pb_udev          *udev;
  54         struct network          *network;
  55         struct user_event       *user_event;
  56
  57         struct discover_device  **devices;
  58         unsigned int            n_devices;
  59
  60         struct ramdisk_device   **ramdisks;
  61         unsigned int            n_ramdisks;
  62
  63         struct waitset          *waitset;
  64         struct waiter           *timeout_waiter;
  65         bool                    autoboot_enabled;
  66         unsigned int            sec_to_boot;
  67
  68         struct discover_boot_option *default_boot_option;
  69         int                     default_boot_option_priority;
  70
  71         struct list             unresolved_boot_options;
  72
  73         struct boot_task        *pending_boot;
  74         bool                    pending_boot_is_default;
  75 };
  76
  77 static int mount_device(struct discover_device *dev);
  78 static int umount_device(struct discover_device *dev);
  79
  80 static int device_handler_init_sources(struct device_handler *handler);
  81 static void device_handler_reinit_sources(struct device_handler *handler);
  82
  83 static void device_handler_update_lang(const char *lang);
  84
  85 void discover_context_add_boot_option(struct discover_context *ctx,
  86                 struct discover_boot_option *boot_option)
  87 {
  88         boot_option->source = ctx->parser;
  89         list_add_tail(&ctx->boot_options, &boot_option->list);
  90         talloc_steal(ctx, boot_option);
  91 }
  92
  93 /**
  94  * device_handler_get_device_count - Get the count of current handler devices.
  95  */
  96
  97 int device_handler_get_device_count(const struct device_handler *handler)
  98 {
  99         return handler->n_devices;
 100 }
 101
 102 /**
 103  * device_handler_get_device - Get a handler device by index.
 104  */
 105
 106 const struct discover_device *device_handler_get_device(
 107         const struct device_handler *handler, unsigned int index)
 108 {
 109         if (index >= handler->n_devices) {
 110                 assert(0 && "bad index");
 111                 return NULL;
 112         }
 113
 114         return handler->devices[index];
 115 }
 116
 117 struct discover_boot_option *discover_boot_option_create(
 118                 struct discover_context *ctx,
 119                 struct discover_device *device)
 120 {
 121         struct discover_boot_option *opt;
 122
 123         opt = talloc_zero(ctx, struct discover_boot_option);
 124         opt->option = talloc_zero(opt, struct boot_option);
 125         opt->device = device;
 126
 127         return opt;
 128 }
 129
 130 static int device_match_uuid(struct discover_device *dev, const char *uuid)
 131 {
 132         return dev->uuid && !strcmp(dev->uuid, uuid);
 133 }
 134
 135 static int device_match_label(struct discover_device *dev, const char *label)
 136 {
 137         return dev->label && !strcmp(dev->label, label);
 138 }
 139
 140 static int device_match_id(struct discover_device *dev, const char *id)
 141 {
 142         return !strcmp(dev->device->id, id);
 143 }
 144
 145 static int device_match_serial(struct discover_device *dev, const char *serial)
 146 {
 147         const char *val = discover_device_get_param(dev, "ID_SERIAL");
 148         return val && !strcmp(val, serial);
 149 }
 150
 151 static struct discover_device *device_lookup(
 152                 struct device_handler *device_handler,
 153                 int (match_fn)(struct discover_device *, const char *),
 154                 const char *str)
 155 {
 156         struct discover_device *dev;
 157         unsigned int i;
 158
 159         if (!str)
 160                 return NULL;
 161
 162         for (i = 0; i < device_handler->n_devices; i++) {
 163                 dev = device_handler->devices[i];
 164
 165                 if (match_fn(dev, str))
 166                         return dev;
 167         }
 168
 169         return NULL;
 170 }
 171
 172 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 173                 const char *name)
 174 {
 175         if (!strncmp(name, "/dev/", strlen("/dev/")))
 176                 name += strlen("/dev/");
 177
 178         return device_lookup_by_id(handler, name);
 179 }
 180
 181 struct discover_device *device_lookup_by_uuid(
 182                 struct device_handler *device_handler,
 183                 const char *uuid)
 184 {
 185         return device_lookup(device_handler, device_match_uuid, uuid);
 186 }
 187
 188 struct discover_device *device_lookup_by_label(
 189                 struct device_handler *device_handler,
 190                 const char *label)
 191 {
 192         return device_lookup(device_handler, device_match_label, label);
 193 }
 194
 195 struct discover_device *device_lookup_by_id(
 196                 struct device_handler *device_handler,
 197                 const char *id)
 198 {
 199         return device_lookup(device_handler, device_match_id, id);
 200 }
 201
 202 struct discover_device *device_lookup_by_serial(
 203                 struct device_handler *device_handler,
 204                 const char *serial)
 205 {
 206         return device_lookup(device_handler, device_match_serial, serial);
 207 }
 208
 209 void device_handler_destroy(struct device_handler *handler)
 210 {
 211         talloc_free(handler);
 212 }
 213
 214 static int destroy_device(void *arg)
 215 {
 216         struct discover_device *dev = arg;
 217
 218         umount_device(dev);
 219
 220         return 0;
 221 }
 222
 223 struct discover_device *discover_device_create(struct device_handler *handler,
 224                 const char *id)
 225 {
 226         struct discover_device *dev;
 227
 228         dev = device_lookup_by_id(handler, id);
 229         if (dev)
 230                 return dev;
 231
 232         dev = talloc_zero(handler, struct discover_device);
 233         dev->device = talloc_zero(dev, struct device);
 234         dev->device->id = talloc_strdup(dev->device, id);
 235         list_init(&dev->params);
 236         list_init(&dev->boot_options);
 237
 238         talloc_set_destructor(dev, destroy_device);
 239
 240         return dev;
 241 }
 242
 243 struct discover_device_param {
 244         char                    *name;
 245         char                    *value;
 246         struct list_item        list;
 247 };
 248
 249 void discover_device_set_param(struct discover_device *device,
 250                 const char *name, const char *value)
 251 {
 252         struct discover_device_param *param;
 253         bool found = false;
 254
 255         list_for_each_entry(&device->params, param, list) {
 256                 if (!strcmp(param->name, name)) {
 257                         found = true;
 258                         break;
 259                 }
 260         }
 261
 262         if (!found) {
 263                 if (!value)
 264                         return;
 265                 param = talloc(device, struct discover_device_param);
 266                 param->name = talloc_strdup(param, name);
 267                 list_add(&device->params, &param->list);
 268         } else {
 269                 if (!value) {
 270                         list_remove(&param->list);
 271                         talloc_free(param);
 272                         return;
 273                 }
 274                 talloc_free(param->value);
 275         }
 276
 277         param->value = talloc_strdup(param, value);
 278 }
 279
 280 const char *discover_device_get_param(struct discover_device *device,
 281                 const char *name)
 282 {
 283         struct discover_device_param *param;
 284
 285         list_for_each_entry(&device->params, param, list) {
 286                 if (!strcmp(param->name, name))
 287                         return param->value;
 288         }
 289         return NULL;
 290 }
 291
 292 struct device_handler *device_handler_init(struct discover_server *server,
 293                 struct waitset *waitset, int dry_run)
 294 {
 295         struct device_handler *handler;
 296         int rc;
 297
 298         handler = talloc_zero(NULL, struct device_handler);
 299         handler->server = server;
 300         handler->waitset = waitset;
 301         handler->dry_run = dry_run;
 302         handler->autoboot_enabled = config_get()->autoboot_enabled;
 303
 304         list_init(&handler->unresolved_boot_options);
 305
 306         /* set up our mount point base */
 307         pb_mkdir_recursive(mount_base());
 308
 309         parser_init();
 310
 311         if (config_get()->safe_mode)
 312                 return handler;
 313
 314         rc = device_handler_init_sources(handler);
 315         if (rc) {
 316                 talloc_free(handler);
 317                 return NULL;
 318         }
 319
 320         return handler;
 321 }
 322
 323 void device_handler_reinit(struct device_handler *handler)
 324 {
 325         struct discover_boot_option *opt, *tmp;
 326         struct ramdisk_device *ramdisk;
 327         unsigned int i;
 328
 329         device_handler_cancel_default(handler);
 330
 331         /* free unresolved boot options */
 332         list_for_each_entry_safe(&handler->unresolved_boot_options,
 333                         opt, tmp, list)
 334                 talloc_free(opt);
 335         list_init(&handler->unresolved_boot_options);
 336
 337         /* drop all devices */
 338         for (i = 0; i < handler->n_devices; i++) {
 339                 discover_server_notify_device_remove(handler->server,
 340                                 handler->devices[i]->device);
 341                 ramdisk = handler->devices[i]->ramdisk;
 342                 talloc_free(handler->devices[i]);
 343                 talloc_free(ramdisk);
 344         }
 345
 346         talloc_free(handler->devices);
 347         handler->devices = NULL;
 348         handler->n_devices = 0;
 349         talloc_free(handler->ramdisks);
 350         handler->ramdisks = NULL;
 351         handler->n_ramdisks = 0;
 352
 353         device_handler_reinit_sources(handler);
 354 }
 355
 356 void device_handler_remove(struct device_handler *handler,
 357                 struct discover_device *device)
 358 {
 359         struct discover_boot_option *opt, *tmp;
 360         unsigned int i;
 361
 362         for (i = 0; i < handler->n_devices; i++)
 363                 if (handler->devices[i] == device)
 364                         break;
 365
 366         if (i == handler->n_devices) {
 367                 talloc_free(device);
 368                 return;
 369         }
 370
 371         /* Free any unresolved options, as they're currently allocated
 372          * against the handler */
 373         list_for_each_entry_safe(&handler->unresolved_boot_options,
 374                         opt, tmp, list) {
 375                 if (opt->device != device)
 376                         continue;
 377                 list_remove(&opt->list);
 378                 talloc_free(opt);
 379         }
 380
 381         /* if this is a network device, we have to unregister it from the
 382          * network code */
 383         if (device->device->type == DEVICE_TYPE_NETWORK)
 384                 network_unregister_device(handler->network, device);
 385
 386         handler->n_devices--;
 387         memmove(&handler->devices[i], &handler->devices[i + 1],
 388                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 389         handler->devices = talloc_realloc(handler, handler->devices,
 390                 struct discover_device *, handler->n_devices);
 391
 392         if (device->notified)
 393                 discover_server_notify_device_remove(handler->server,
 394                                                         device->device);
 395
 396         talloc_free(device);
 397 }
 398
 399 static void boot_status(void *arg, struct boot_status *status)
 400 {
 401         struct device_handler *handler = arg;
 402
 403         discover_server_notify_boot_status(handler->server, status);
 404 }
 405
 406 static void countdown_status(struct device_handler *handler,
 407                 struct discover_boot_option *opt, unsigned int sec)
 408 {
 409         struct boot_status status;
 410
 411         status.type = BOOT_STATUS_INFO;
 412         status.progress = -1;
 413         status.detail = NULL;
 414         status.message = talloc_asprintf(handler,
 415                         _("Booting in %d sec: %s"), sec, opt->option->name);
 416
 417         discover_server_notify_boot_status(handler->server, &status);
 418
 419         talloc_free(status.message);
 420 }
 421
 422 static int default_timeout(void *arg)
 423 {
 424         struct device_handler *handler = arg;
 425         struct discover_boot_option *opt;
 426
 427         if (!handler->default_boot_option)
 428                 return 0;
 429
 430         if (handler->pending_boot)
 431                 return 0;
 432
 433         opt = handler->default_boot_option;
 434
 435         if (handler->sec_to_boot) {
 436                 countdown_status(handler, opt, handler->sec_to_boot);
 437                 handler->sec_to_boot--;
 438                 handler->timeout_waiter = waiter_register_timeout(
 439                                                 handler->waitset, 1000,
 440                                                 default_timeout, handler);
 441                 return 0;
 442         }
 443
 444         handler->timeout_waiter = NULL;
 445
 446         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 447
 448         handler->pending_boot = boot(handler, handler->default_boot_option,
 449                         NULL, handler->dry_run, boot_status, handler);
 450         handler->pending_boot_is_default = true;
 451         return 0;
 452 }
 453
 454 struct {
 455         enum ipmi_bootdev       ipmi_type;
 456         enum device_type        device_type;
 457 } device_type_map[] = {
 458         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
 459         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
 460         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
 461 };
 462
 463 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
 464                 enum device_type device_type)
 465 {
 466         unsigned int i;
 467
 468         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
 469                 if (device_type_map[i].device_type == device_type)
 470                         return device_type_map[i].ipmi_type == ipmi_type;
 471         }
 472
 473         return false;
 474 }
 475
 476 static int autoboot_option_priority(const struct config *config,
 477                                 struct discover_boot_option *opt)
 478 {
 479         enum device_type type = opt->device->device->type;
 480         const char *uuid = opt->device->uuid;
 481         struct autoboot_option *auto_opt;
 482         unsigned int i;
 483
 484         for (i = 0; i < config->n_autoboot_opts; i++) {
 485                 auto_opt = &config->autoboot_opts[i];
 486                 if (auto_opt->boot_type == BOOT_DEVICE_UUID)
 487                         if (!strcmp(auto_opt->uuid, uuid))
 488                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 489
 490                 if (auto_opt->boot_type == BOOT_DEVICE_TYPE)
 491                         if (auto_opt->type == type ||
 492                             auto_opt->type == DEVICE_TYPE_ANY)
 493                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 494         }
 495
 496         return -1;
 497 }
 498
 499 /*
 500  * We have different priorities to resolve conflicts between boot options that
 501  * report to be the default for their device. This function assigns a priority
 502  * for these options.
 503  */
 504 static enum default_priority default_option_priority(
 505                 struct discover_boot_option *opt)
 506 {
 507         const struct config *config;
 508
 509         config = config_get();
 510
 511         /* We give highest priority to IPMI-configured boot options. If
 512          * we have an IPMI bootdev configuration set, then we don't allow
 513          * any other defaults */
 514         if (config->ipmi_bootdev) {
 515                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
 516                                 opt->device->device->type);
 517                 if (ipmi_match)
 518                         return DEFAULT_PRIORITY_REMOTE;
 519
 520                 pb_debug("handler: disabled default priority due to "
 521                                 "non-matching IPMI type %x\n",
 522                                 config->ipmi_bootdev);
 523                 return DEFAULT_PRIORITY_DISABLED;
 524         }
 525
 526         /* Next, try to match the option against the user-defined autoboot
 527          * options, either by device UUID or type. */
 528         if (config->n_autoboot_opts) {
 529                 int boot_match = autoboot_option_priority(config, opt);
 530                 if (boot_match > 0)
 531                         return boot_match;
 532         }
 533
 534         /* If the option didn't match any entry in the array, it is disabled */
 535         pb_debug("handler: disabled default priority due to "
 536                         "non-matching UUID or type\n");
 537         return DEFAULT_PRIORITY_DISABLED;
 538 }
 539
 540 static void set_default(struct device_handler *handler,
 541                 struct discover_boot_option *opt)
 542 {
 543         enum default_priority cur_prio, new_prio;
 544
 545         if (!handler->autoboot_enabled)
 546                 return;
 547
 548         pb_debug("handler: new default option: %s\n", opt->option->id);
 549
 550         new_prio = default_option_priority(opt);
 551
 552         /* Anything outside our range prevents a default boot */
 553         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
 554                 return;
 555
 556         pb_debug("handler: calculated priority %d\n", new_prio);
 557
 558         /* Resolve any conflicts: if we have a new default option, it only
 559          * replaces the current if it has a higher priority. */
 560         if (handler->default_boot_option) {
 561
 562                 cur_prio = handler->default_boot_option_priority;
 563
 564                 if (new_prio < cur_prio) {
 565                         pb_log("handler: new prio %d beats "
 566                                         "old prio %d for %s\n",
 567                                         new_prio, cur_prio,
 568                                         handler->default_boot_option
 569                                                 ->option->id);
 570                         handler->default_boot_option = opt;
 571                         handler->default_boot_option_priority = new_prio;
 572                         /* extend the timeout a little, so the user sees some
 573                          * indication of the change */
 574                         handler->sec_to_boot += 2;
 575                 }
 576
 577                 return;
 578         }
 579
 580         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 581         handler->default_boot_option = opt;
 582         handler->default_boot_option_priority = new_prio;
 583
 584         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
 585                opt->option->id, handler->sec_to_boot);
 586
 587         default_timeout(handler);
 588 }
 589
 590 static bool resource_is_resolved(struct resource *res)
 591 {
 592         return !res || res->resolved;
 593 }
 594
 595 /* We only use this in an assert, which will disappear if we're compiling
 596  * with NDEBUG, so we need the 'used' attribute for these builds */
 597 static bool __attribute__((used)) boot_option_is_resolved(
 598                 struct discover_boot_option *opt)
 599 {
 600         return resource_is_resolved(opt->boot_image) &&
 601                 resource_is_resolved(opt->initrd) &&
 602                 resource_is_resolved(opt->dtb) &&
 603                 resource_is_resolved(opt->icon);
 604 }
 605
 606 static bool resource_resolve(struct resource *res, const char *name,
 607                 struct discover_boot_option *opt,
 608                 struct device_handler *handler)
 609 {
 610         struct parser *parser = opt->source;
 611
 612         if (resource_is_resolved(res))
 613                 return true;
 614
 615         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 616                         opt->option->id, name, parser->name);
 617         parser->resolve_resource(handler, res);
 618
 619         return res->resolved;
 620 }
 621
 622 static bool boot_option_resolve(struct discover_boot_option *opt,
 623                 struct device_handler *handler)
 624 {
 625         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 626                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 627                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 628                 resource_resolve(opt->icon, "icon", opt, handler);
 629 }
 630
 631 static void boot_option_finalise(struct device_handler *handler,
 632                 struct discover_boot_option *opt)
 633 {
 634         assert(boot_option_is_resolved(opt));
 635
 636         /* check that the parsers haven't set any of the final data */
 637         assert(!opt->option->boot_image_file);
 638         assert(!opt->option->initrd_file);
 639         assert(!opt->option->dtb_file);
 640         assert(!opt->option->icon_file);
 641         assert(!opt->option->device_id);
 642
 643         if (opt->boot_image)
 644                 opt->option->boot_image_file = opt->boot_image->url->full;
 645         if (opt->initrd)
 646                 opt->option->initrd_file = opt->initrd->url->full;
 647         if (opt->dtb)
 648                 opt->option->dtb_file = opt->dtb->url->full;
 649         if (opt->icon)
 650                 opt->option->icon_file = opt->icon->url->full;
 651
 652         opt->option->device_id = opt->device->device->id;
 653
 654         if (opt->option->is_default)
 655                 set_default(handler, opt);
 656 }
 657
 658 static void notify_boot_option(struct device_handler *handler,
 659                 struct discover_boot_option *opt)
 660 {
 661         struct discover_device *dev = opt->device;
 662
 663         if (!dev->notified)
 664                 discover_server_notify_device_add(handler->server,
 665                                                   opt->device->device);
 666         dev->notified = true;
 667         discover_server_notify_boot_option_add(handler->server, opt->option);
 668 }
 669
 670 static void process_boot_option_queue(struct device_handler *handler)
 671 {
 672         struct discover_boot_option *opt, *tmp;
 673
 674         list_for_each_entry_safe(&handler->unresolved_boot_options,
 675                         opt, tmp, list) {
 676
 677                 pb_debug("queue: attempting resolution for %s\n",
 678                                 opt->option->id);
 679
 680                 if (!boot_option_resolve(opt, handler))
 681                         continue;
 682
 683                 pb_debug("\tresolved!\n");
 684
 685                 list_remove(&opt->list);
 686                 list_add_tail(&opt->device->boot_options, &opt->list);
 687                 talloc_steal(opt->device, opt);
 688                 boot_option_finalise(handler, opt);
 689                 notify_boot_option(handler, opt);
 690         }
 691 }
 692
 693 struct discover_context *device_handler_discover_context_create(
 694                 struct device_handler *handler,
 695                 struct discover_device *device)
 696 {
 697         struct discover_context *ctx;
 698
 699         ctx = talloc_zero(handler, struct discover_context);
 700         ctx->device = device;
 701         ctx->network = handler->network;
 702         list_init(&ctx->boot_options);
 703
 704         return ctx;
 705 }
 706
 707 /**
 708  * context_commit - Commit a temporary discovery context to the handler,
 709  * and notify the clients about any new options / devices
 710  */
 711 void device_handler_discover_context_commit(struct device_handler *handler,
 712                 struct discover_context *ctx)
 713 {
 714         struct discover_device *dev = ctx->device;
 715         struct discover_boot_option *opt, *tmp;
 716
 717         if (!device_lookup_by_id(handler, dev->device->id))
 718                 device_handler_add_device(handler, dev);
 719
 720         /* move boot options from the context to the device */
 721         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
 722                 list_remove(&opt->list);
 723
 724                 if (boot_option_resolve(opt, handler)) {
 725                         pb_log("boot option %s is resolved, "
 726                                         "sending to clients\n",
 727                                         opt->option->id);
 728                         list_add_tail(&dev->boot_options, &opt->list);
 729                         talloc_steal(dev, opt);
 730                         boot_option_finalise(handler, opt);
 731                         notify_boot_option(handler, opt);
 732                 } else {
 733                         if (!opt->source->resolve_resource) {
 734                                 pb_log("parser %s gave us an unresolved "
 735                                         "resource (%s), but no way to "
 736                                         "resolve it\n",
 737                                         opt->source->name, opt->option->id);
 738                                 talloc_free(opt);
 739                         } else {
 740                                 pb_log("boot option %s is unresolved, "
 741                                                 "adding to queue\n",
 742                                                 opt->option->id);
 743                                 list_add(&handler->unresolved_boot_options,
 744                                                 &opt->list);
 745                                 talloc_steal(handler, opt);
 746                         }
 747                 }
 748         }
 749 }
 750
 751 void device_handler_add_device(struct device_handler *handler,
 752                 struct discover_device *device)
 753 {
 754         handler->n_devices++;
 755         handler->devices = talloc_realloc(handler, handler->devices,
 756                                 struct discover_device *, handler->n_devices);
 757         handler->devices[handler->n_devices - 1] = device;
 758
 759         if (device->device->type == DEVICE_TYPE_NETWORK)
 760                 network_register_device(handler->network, device);
 761 }
 762
 763 void device_handler_add_ramdisk(struct device_handler *handler,
 764                 const char *path)
 765 {
 766         struct ramdisk_device *dev;
 767         unsigned int i;
 768
 769         if (!path)
 770                 return;
 771
 772         for (i = 0; i < handler->n_ramdisks; i++)
 773                 if (!strcmp(handler->ramdisks[i]->path, path))
 774                         return;
 775
 776         dev = talloc_zero(handler, struct ramdisk_device);
 777         if (!dev) {
 778                 pb_log("Failed to allocate memory to track %s\n", path);
 779                 return;
 780         }
 781
 782         dev->path = talloc_strdup(handler, path);
 783
 784         handler->ramdisks = talloc_realloc(handler, handler->ramdisks,
 785                                 struct ramdisk_device *,
 786                                 handler->n_ramdisks + 1);
 787         if (!handler->ramdisks) {
 788                 pb_log("Failed to reallocate memory"
 789                        "- ramdisk tracking inconsistent!\n");
 790                 return;
 791         }
 792
 793         handler->ramdisks[i] = dev;
 794         i = handler->n_ramdisks++;
 795 }
 796
 797 struct ramdisk_device *device_handler_get_ramdisk(
 798                 struct device_handler *handler)
 799 {
 800         unsigned int i;
 801         char *name;
 802         dev_t id;
 803
 804         /* Check if free ramdisk exists */
 805         for (i = 0; i < handler->n_ramdisks; i++)
 806                 if (!handler->ramdisks[i]->snapshot &&
 807                     !handler->ramdisks[i]->origin &&
 808                     !handler->ramdisks[i]->base)
 809                         return handler->ramdisks[i];
 810
 811         /* Otherwise create a new one */
 812         name = talloc_asprintf(handler, "/dev/ram%d",
 813                         handler->n_ramdisks);
 814         if (!name) {
 815                 pb_debug("Failed to allocate memory to name /dev/ram%d",
 816                         handler->n_ramdisks);
 817                 return NULL;
 818         }
 819
 820         id = makedev(1, handler->n_ramdisks);
 821         if (mknod(name, S_IFBLK, id)) {
 822                 if (errno == EEXIST) {
 823                         /* We haven't yet received updates for existing
 824                          * ramdisks - add and use this one */
 825                         pb_debug("Using untracked ramdisk %s\n", name);
 826                 } else {
 827                         pb_log("Failed to create new ramdisk %s: %s\n",
 828                                name, strerror(errno));
 829                         return NULL;
 830                 }
 831         }
 832         device_handler_add_ramdisk(handler, name);
 833         talloc_free(name);
 834
 835         return handler->ramdisks[i];
 836 }
 837
 838 void device_handler_release_ramdisk(struct discover_device *device)
 839 {
 840         struct ramdisk_device *ramdisk = device->ramdisk;
 841
 842         talloc_free(ramdisk->snapshot);
 843         talloc_free(ramdisk->origin);
 844         talloc_free(ramdisk->base);
 845
 846         ramdisk->snapshot = ramdisk->origin = ramdisk->base = NULL;
 847         ramdisk->sectors = 0;
 848
 849         device->ramdisk = NULL;
 850 }
 851
 852 /* Start discovery on a hotplugged device. The device will be in our devices
 853  * array, but has only just been initialised by the hotplug source.
 854  */
 855 int device_handler_discover(struct device_handler *handler,
 856                 struct discover_device *dev)
 857 {
 858         struct discover_context *ctx;
 859         struct boot_status *status;
 860         int rc;
 861
 862         status = talloc_zero(handler, struct boot_status);
 863         status->type = BOOT_STATUS_INFO;
 864         status->message = talloc_asprintf(status, "Processing %s device %s",
 865                                 device_type_display_name(dev->device->type),
 866                                 dev->device->id);
 867         boot_status(handler, status);
 868
 869         process_boot_option_queue(handler);
 870
 871         /* create our context */
 872         ctx = device_handler_discover_context_create(handler, dev);
 873
 874         rc = mount_device(dev);
 875         if (rc)
 876                 goto out;
 877
 878         /* add this device to our system info */
 879         system_info_register_blockdev(dev->device->id, dev->uuid,
 880                         dev->mount_path);
 881
 882         /* run the parsers. This will populate the ctx's boot_option list. */
 883         iterate_parsers(ctx);
 884
 885         /* add discovered stuff to the handler */
 886         device_handler_discover_context_commit(handler, ctx);
 887
 888 out:
 889         status->message = talloc_asprintf(status,"Processing %s complete\n",
 890                                 dev->device->id);
 891         boot_status(handler, status);
 892
 893         talloc_free(status);
 894         talloc_free(ctx);
 895
 896         return 0;
 897 }
 898
 899 /* Incoming dhcp event */
 900 int device_handler_dhcp(struct device_handler *handler,
 901                 struct discover_device *dev, struct event *event)
 902 {
 903         struct discover_context *ctx;
 904         struct boot_status *status;
 905
 906         status = talloc_zero(handler, struct boot_status);
 907         status->type = BOOT_STATUS_INFO;
 908         status->message = talloc_asprintf(status, "Processing dhcp event on %s",
 909                                 dev->device->id);
 910         boot_status(handler, status);
 911
 912         /* create our context */
 913         ctx = device_handler_discover_context_create(handler, dev);
 914         ctx->event = event;
 915
 916         iterate_parsers(ctx);
 917
 918         device_handler_discover_context_commit(handler, ctx);
 919
 920         status->message = talloc_asprintf(status,"Processing %s complete\n",
 921                                 dev->device->id);
 922         boot_status(handler, status);
 923
 924         talloc_free(status);
 925         talloc_free(ctx);
 926
 927         return 0;
 928 }
 929
 930 /* incoming conf event */
 931 int device_handler_conf(struct device_handler *handler,
 932                 struct discover_device *dev, struct pb_url *url)
 933 {
 934         struct discover_context *ctx;
 935         struct boot_status *status;
 936
 937         status = talloc_zero(handler, struct boot_status);
 938         status->type = BOOT_STATUS_INFO;
 939         status->message = talloc_asprintf(status, "Processing user config");
 940         boot_status(handler, status);
 941
 942         /* create our context */
 943         ctx = device_handler_discover_context_create(handler, dev);
 944         ctx->conf_url = url;
 945
 946         iterate_parsers(ctx);
 947
 948         device_handler_discover_context_commit(handler, ctx);
 949
 950         status->message = talloc_asprintf(status,
 951                                 "Processing user config complete");
 952         boot_status(handler, status);
 953
 954         talloc_free(status);
 955         talloc_free(ctx);
 956
 957         return 0;
 958 }
 959
 960 static struct discover_boot_option *find_boot_option_by_id(
 961                 struct device_handler *handler, const char *id)
 962 {
 963         unsigned int i;
 964
 965         for (i = 0; i < handler->n_devices; i++) {
 966                 struct discover_device *dev = handler->devices[i];
 967                 struct discover_boot_option *opt;
 968
 969                 list_for_each_entry(&dev->boot_options, opt, list)
 970                         if (!strcmp(opt->option->id, id))
 971                                 return opt;
 972         }
 973
 974         return NULL;
 975 }
 976
 977 void device_handler_boot(struct device_handler *handler,
 978                 struct boot_command *cmd)
 979 {
 980         struct discover_boot_option *opt = NULL;
 981
 982         if (cmd->option_id && strlen(cmd->option_id))
 983                 opt = find_boot_option_by_id(handler, cmd->option_id);
 984
 985         if (handler->pending_boot)
 986                 boot_cancel(handler->pending_boot);
 987
 988         platform_pre_boot();
 989
 990         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
 991                         boot_status, handler);
 992         handler->pending_boot_is_default = false;
 993 }
 994
 995 void device_handler_cancel_default(struct device_handler *handler)
 996 {
 997         struct boot_status status;
 998
 999         if (handler->timeout_waiter)
1000                 waiter_remove(handler->timeout_waiter);
1001
1002         handler->timeout_waiter = NULL;
1003         handler->autoboot_enabled = false;
1004
1005         /* we only send status if we had a default boot option queued */
1006         if (!handler->default_boot_option)
1007                 return;
1008
1009         pb_log("Cancelling default boot option\n");
1010
1011         if (handler->pending_boot && handler->pending_boot_is_default) {
1012                 boot_cancel(handler->pending_boot);
1013                 handler->pending_boot = NULL;
1014                 handler->pending_boot_is_default = false;
1015         }
1016
1017         handler->default_boot_option = NULL;
1018
1019         status.type = BOOT_STATUS_INFO;
1020         status.progress = -1;
1021         status.detail = NULL;
1022         status.message = _("Default boot cancelled");
1023
1024         discover_server_notify_boot_status(handler->server, &status);
1025 }
1026
1027 void device_handler_update_config(struct device_handler *handler,
1028                 struct config *config)
1029 {
1030         int rc;
1031
1032         rc = config_set(config);
1033         if (rc)
1034                 return;
1035
1036         discover_server_notify_config(handler->server, config);
1037         device_handler_update_lang(config->lang);
1038         device_handler_reinit(handler);
1039 }
1040
1041 static char *device_from_addr(void *ctx, struct pb_url *url)
1042 {
1043         char *ipaddr, *buf, *tok, *dev = NULL;
1044         const char *delim = " ";
1045         struct sockaddr_in *ip;
1046         struct sockaddr_in si;
1047         struct addrinfo *res;
1048         struct process *p;
1049         int rc;
1050
1051         /* Note: IPv4 only */
1052         rc = inet_pton(AF_INET, url->host, &(si.sin_addr));
1053         if (rc > 0) {
1054                 ipaddr = url->host;
1055         } else {
1056                 /* need to turn hostname into a valid IP */
1057                 rc = getaddrinfo(url->host, NULL, NULL, &res);
1058                 if (rc) {
1059                         pb_debug("%s: Invalid URL\n",__func__);
1060                         return NULL;
1061                 }
1062                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
1063                 ip = (struct sockaddr_in *) res->ai_addr;
1064                 inet_ntop(AF_INET, &(ip->sin_addr), ipaddr, INET_ADDRSTRLEN);
1065                 freeaddrinfo(res);
1066         }
1067
1068         const char *argv[] = {
1069                 pb_system_apps.ip,
1070                 "route", "show", "to", "match",
1071                 ipaddr,
1072                 NULL
1073         };
1074
1075         p = process_create(ctx);
1076
1077         p->path = pb_system_apps.ip;
1078         p->argv = argv;
1079         p->keep_stdout = true;
1080
1081         rc = process_run_sync(p);
1082
1083         if (rc) {
1084                 /* ip has complained for some reason; most likely
1085                  * there is no route to the host - bail out */
1086                 pb_debug("%s: No route to %s\n",__func__,url->host);
1087                 return NULL;
1088         }
1089
1090         buf = p->stdout_buf;
1091         /* If a route is found, ip-route output will be of the form
1092          * "... dev DEVNAME ... " */
1093         tok = strtok(buf, delim);
1094         while (tok) {
1095                 if (!strcmp(tok, "dev")) {
1096                         tok = strtok(NULL, delim);
1097                         dev = talloc_strdup(ctx, tok);
1098                         break;
1099                 }
1100                 tok = strtok(NULL, delim);
1101         }
1102
1103         process_release(p);
1104         if (dev)
1105                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
1106         return dev;
1107 }
1108
1109
1110 void device_handler_process_url(struct device_handler *handler,
1111                 const char *url)
1112 {
1113         struct discover_context *ctx;
1114         struct discover_device *dev;
1115         struct boot_status *status;
1116         struct pb_url *pb_url;
1117         struct event *event;
1118         struct param *param;
1119
1120         status = talloc(handler, struct boot_status);
1121
1122         status->type = BOOT_STATUS_ERROR;
1123         status->progress = 0;
1124         status->detail = talloc_asprintf(status,
1125                         _("Received config URL %s"), url);
1126
1127         if (!handler->network) {
1128                 status->message = talloc_asprintf(handler,
1129                                         _("No network configured"));
1130                 goto msg;
1131         }
1132
1133         event = talloc(handler, struct event);
1134         event->type = EVENT_TYPE_USER;
1135         event->action = EVENT_ACTION_CONF;
1136
1137         event->params = talloc_array(event, struct param, 1);
1138         param = &event->params[0];
1139         param->name = talloc_strdup(event, "pxeconffile");
1140         param->value = talloc_strdup(event, url);
1141         event->n_params = 1;
1142
1143         pb_url = pb_url_parse(event, event->params->value);
1144         if (!pb_url || !pb_url->host) {
1145                 status->message = talloc_asprintf(handler,
1146                                         _("Invalid config URL!"));
1147                 goto msg;
1148         }
1149
1150         event->device = device_from_addr(event, pb_url);
1151         if (!event->device) {
1152                 status->message = talloc_asprintf(status,
1153                                         _("Unable to route to host %s"),
1154                                         pb_url->host);
1155                 goto msg;
1156         }
1157
1158         dev = discover_device_create(handler, event->device);
1159         ctx = device_handler_discover_context_create(handler, dev);
1160         ctx->event = event;
1161
1162         iterate_parsers(ctx);
1163
1164         device_handler_discover_context_commit(handler, ctx);
1165
1166         talloc_free(ctx);
1167
1168         status->type = BOOT_STATUS_INFO;
1169         status->message = talloc_asprintf(status, _("Config file %s parsed"),
1170                                         pb_url->file);
1171 msg:
1172         boot_status(handler, status);
1173         talloc_free(status);
1174 }
1175
1176 #ifndef PETITBOOT_TEST
1177
1178 static void device_handler_update_lang(const char *lang)
1179 {
1180         const char *cur_lang;
1181
1182         if (!lang)
1183                 return;
1184
1185         cur_lang = setlocale(LC_ALL, NULL);
1186         if (cur_lang && !strcmp(cur_lang, lang))
1187                 return;
1188
1189         setlocale(LC_ALL, lang);
1190 }
1191
1192 static int device_handler_init_sources(struct device_handler *handler)
1193 {
1194         /* init our device sources: udev, network and user events */
1195         handler->udev = udev_init(handler, handler->waitset);
1196         if (!handler->udev)
1197                 return -1;
1198
1199         handler->network = network_init(handler, handler->waitset,
1200                         handler->dry_run);
1201         if (!handler->network)
1202                 return -1;
1203
1204         handler->user_event = user_event_init(handler, handler->waitset);
1205         if (!handler->user_event)
1206                 return -1;
1207
1208         return 0;
1209 }
1210
1211 static void device_handler_reinit_sources(struct device_handler *handler)
1212 {
1213         /* if we haven't initialised sources previously (becuase we started in
1214          * safe mode), then init once here. */
1215         if (!(handler->udev || handler->network || handler->user_event)) {
1216                 device_handler_init_sources(handler);
1217                 return;
1218         }
1219
1220         udev_reinit(handler->udev);
1221
1222         network_shutdown(handler->network);
1223         handler->network = network_init(handler, handler->waitset,
1224                         handler->dry_run);
1225 }
1226
1227 static const char *fs_parameters(unsigned int rw_flags, const char *fstype)
1228 {
1229         if ((rw_flags | MS_RDONLY) != MS_RDONLY)
1230                 return "";
1231
1232         /* Avoid writing back to the disk on journaled filesystems */
1233         if (!strncmp(fstype, "ext4", strlen("ext4")))
1234                 return "norecovery";
1235         if (!strncmp(fstype, "xfs", strlen("xfs")))
1236                 return "norecovery";
1237
1238         return "";
1239 }
1240
1241 static inline const char *get_device_path(struct discover_device *dev)
1242 {
1243         return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
1244 }
1245
1246 static bool check_existing_mount(struct discover_device *dev)
1247 {
1248         struct stat devstat, mntstat;
1249         const char *device_path;
1250         struct mntent *mnt;
1251         FILE *fp;
1252         int rc;
1253
1254         device_path = get_device_path(dev);
1255
1256         rc = stat(device_path, &devstat);
1257         if (rc) {
1258                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1259                 return false;
1260         }
1261
1262         if (!S_ISBLK(devstat.st_mode)) {
1263                 pb_debug("%s: %s isn't a block device?\n", __func__,
1264                                 dev->device_path);
1265                 return false;
1266         }
1267
1268         fp = fopen("/proc/self/mounts", "r");
1269
1270         for (;;) {
1271                 mnt = getmntent(fp);
1272                 if (!mnt)
1273                         break;
1274
1275                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1276                         continue;
1277
1278                 rc = stat(mnt->mnt_fsname, &mntstat);
1279                 if (rc)
1280                         continue;
1281
1282                 if (!S_ISBLK(mntstat.st_mode))
1283                         continue;
1284
1285                 if (mntstat.st_rdev == devstat.st_rdev) {
1286                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1287                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1288                         dev->mounted = true;
1289                         dev->unmount = false;
1290
1291                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1292                                         __func__, dev->device_path,
1293                                         dev->mounted_rw ? 'w' : 'o',
1294                                         mnt->mnt_dir);
1295                         break;
1296                 }
1297         }
1298
1299         fclose(fp);
1300
1301         return mnt != NULL;
1302 }
1303
1304 static int mount_device(struct discover_device *dev)
1305 {
1306         const char *fstype, *device_path;
1307         int rc;
1308
1309         if (!dev->device_path)
1310                 return -1;
1311
1312         if (dev->mounted)
1313                 return 0;
1314
1315         if (check_existing_mount(dev))
1316                 return 0;
1317
1318         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1319         if (!fstype)
1320                 return 0;
1321
1322         /* ext3 treats the norecovery option as an error, so mount the device
1323          * as an ext4 filesystem instead */
1324         if (!strncmp(fstype, "ext3", strlen("ext3"))) {
1325                 pb_debug("Mounting ext3 filesystem as ext4\n");
1326                 fstype = talloc_asprintf(dev, "ext4");
1327         }
1328
1329         dev->mount_path = join_paths(dev, mount_base(),
1330                                         dev->device_path);
1331
1332         if (pb_mkdir_recursive(dev->mount_path)) {
1333                 pb_log("couldn't create mount directory %s: %s\n",
1334                                 dev->mount_path, strerror(errno));
1335                 goto err_free;
1336         }
1337
1338         device_path = get_device_path(dev);
1339
1340         pb_log("mounting device %s read-only\n", dev->device_path);
1341         errno = 0;
1342         rc = mount(device_path, dev->mount_path, fstype,
1343                         MS_RDONLY | MS_SILENT,
1344                         fs_parameters(MS_RDONLY, fstype));
1345         if (!rc) {
1346                 dev->mounted = true;
1347                 dev->mounted_rw = false;
1348                 dev->unmount = true;
1349                 return 0;
1350         }
1351
1352         pb_log("couldn't mount device %s: mount failed: %s\n",
1353                         device_path, strerror(errno));
1354
1355         /* If mount fails clean up any snapshot */
1356         devmapper_destroy_snapshot(dev);
1357
1358         pb_rmdir_recursive(mount_base(), dev->mount_path);
1359 err_free:
1360         talloc_free(dev->mount_path);
1361         dev->mount_path = NULL;
1362         return -1;
1363 }
1364
1365 static int umount_device(struct discover_device *dev)
1366 {
1367         const char *device_path;
1368         int rc;
1369
1370         if (!dev->mounted || !dev->unmount)
1371                 return 0;
1372
1373         device_path = get_device_path(dev);
1374
1375         pb_log("unmounting device %s\n", device_path);
1376         rc = umount(dev->mount_path);
1377         if (rc)
1378                 return -1;
1379
1380         dev->mounted = false;
1381         devmapper_destroy_snapshot(dev);
1382
1383         pb_rmdir_recursive(mount_base(), dev->mount_path);
1384
1385         talloc_free(dev->mount_path);
1386         dev->mount_path = NULL;
1387
1388         return 0;
1389 }
1390
1391 int device_request_write(struct discover_device *dev, bool *release)
1392 {
1393         const char *fstype, *device_path;
1394         int rc;
1395
1396         *release = false;
1397
1398         if (!dev->mounted)
1399                 return -1;
1400
1401         if (dev->mounted_rw)
1402                 return 0;
1403
1404         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1405
1406         device_path = get_device_path(dev);
1407
1408         pb_log("remounting device %s read-write\n", device_path);
1409
1410         rc = umount(dev->mount_path);
1411         if (rc) {
1412                 pb_log("Failed to unmount %s: %s\n",
1413                        dev->mount_path, strerror(errno));
1414                 return -1;
1415         }
1416
1417         rc = mount(device_path, dev->mount_path, fstype,
1418                         MS_SILENT,
1419                         fs_parameters(MS_REMOUNT, fstype));
1420         if (rc)
1421                 goto mount_ro;
1422
1423         dev->mounted_rw = true;
1424         *release = true;
1425         return 0;
1426
1427 mount_ro:
1428         pb_log("Unable to remount device %s read-write: %s\n",
1429                device_path, strerror(errno));
1430         if (mount(device_path, dev->mount_path, fstype,
1431                         MS_RDONLY | MS_SILENT,
1432                         fs_parameters(MS_RDONLY, fstype)))
1433                 pb_log("Unable to recover mount for %s: %s\n",
1434                        device_path, strerror(errno));
1435         return -1;
1436 }
1437
1438 void device_release_write(struct discover_device *dev, bool release)
1439 {
1440         const char *fstype, *device_path;
1441         int rc = 0;
1442
1443         if (!release)
1444                 return;
1445
1446         device_path = get_device_path(dev);
1447
1448         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1449
1450         pb_log("remounting device %s read-only\n", device_path);
1451
1452         if (umount(dev->mount_path)) {
1453                 pb_log("Failed to unmount %s\n", dev->mount_path);
1454                 return;
1455         }
1456         dev->mounted_rw = dev->mounted = false;
1457
1458         if (dev->ramdisk) {
1459                 devmapper_merge_snapshot(dev);
1460                 /* device_path becomes stale after merge */
1461                 device_path = get_device_path(dev);
1462         }
1463
1464         mount(device_path, dev->mount_path, fstype,
1465                         MS_RDONLY | MS_SILENT,
1466                         fs_parameters(MS_RDONLY, fstype));
1467         if (rc)
1468                 pb_log("Failed to remount %s read-only: %s\n",
1469                        device_path, strerror(errno));
1470         else
1471                 dev->mounted = true;
1472 }
1473
1474 #else
1475
1476 static void device_handler_update_lang(const char *lang __attribute__((unused)))
1477 {
1478 }
1479
1480 static int device_handler_init_sources(
1481                 struct device_handler *handler __attribute__((unused)))
1482 {
1483         return 0;
1484 }
1485
1486 static void device_handler_reinit_sources(
1487                 struct device_handler *handler __attribute__((unused)))
1488 {
1489 }
1490
1491 static int umount_device(struct discover_device *dev __attribute__((unused)))
1492 {
1493         return 0;
1494 }
1495
1496 static int __attribute__((unused)) mount_device(
1497                 struct discover_device *dev __attribute__((unused)))
1498 {
1499         return 0;
1500 }
1501
1502 int device_request_write(struct discover_device *dev __attribute__((unused)),
1503                 bool *release)
1504 {
1505         *release = true;
1506         return 0;
1507 }
1508
1509 void device_release_write(struct discover_device *dev __attribute__((unused)),
1510         bool release __attribute__((unused)))
1511 {
1512 }
1513
1514 #endif
1515