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