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/sysmacros.h>
  23 #include <sys/types.h>
  24 #include <sys/socket.h>
  25 #include <netdb.h>
  26 #include <arpa/inet.h>
  27
  28 #include "device-handler.h"
  29 #include "discover-server.h"
  30 #include "devmapper.h"
  31 #include "user-event.h"
  32 #include "platform.h"
  33 #include "event.h"
  34 #include "parser.h"
  35 #include "resource.h"
  36 #include "paths.h"
  37 #include "sysinfo.h"
  38 #include "boot.h"
  39 #include "udev.h"
  40 #include "network.h"
  41 #include "ipmi.h"
  42
  43 enum default_priority {
  44         DEFAULT_PRIORITY_REMOTE         = 1,
  45         DEFAULT_PRIORITY_LOCAL_FIRST    = 2,
  46         DEFAULT_PRIORITY_LOCAL_LAST     = 0xfe,
  47         DEFAULT_PRIORITY_DISABLED       = 0xff,
  48 };
  49
  50 struct progress_info {
  51         unsigned int                    percentage;
  52         unsigned long                   size;           /* size in bytes */
  53
  54         const struct process_info       *procinfo;
  55         struct list_item        list;
  56 };
  57
  58 struct device_handler {
  59         struct discover_server  *server;
  60         int                     dry_run;
  61
  62         struct pb_udev          *udev;
  63         struct network          *network;
  64         struct user_event       *user_event;
  65
  66         struct discover_device  **devices;
  67         unsigned int            n_devices;
  68
  69         struct ramdisk_device   **ramdisks;
  70         unsigned int            n_ramdisks;
  71
  72         struct waitset          *waitset;
  73         struct waiter           *timeout_waiter;
  74         bool                    autoboot_enabled;
  75         unsigned int            sec_to_boot;
  76
  77         struct discover_boot_option *default_boot_option;
  78         int                     default_boot_option_priority;
  79
  80         struct list             unresolved_boot_options;
  81
  82         struct boot_task        *pending_boot;
  83         bool                    pending_boot_is_default;
  84
  85         struct list             progress;
  86         unsigned int            n_progress;
  87
  88         struct plugin_option    **plugins;
  89         unsigned int            n_plugins;
  90 };
  91
  92 static int mount_device(struct discover_device *dev);
  93 static int umount_device(struct discover_device *dev);
  94
  95 static int device_handler_init_sources(struct device_handler *handler);
  96 static void device_handler_reinit_sources(struct device_handler *handler);
  97
  98 static void device_handler_update_lang(const char *lang);
  99
 100 void discover_context_add_boot_option(struct discover_context *ctx,
 101                 struct discover_boot_option *boot_option)
 102 {
 103         boot_option->source = ctx->parser;
 104         list_add_tail(&ctx->boot_options, &boot_option->list);
 105         talloc_steal(ctx, boot_option);
 106 }
 107
 108 /**
 109  * device_handler_get_device_count - Get the count of current handler devices.
 110  */
 111
 112 int device_handler_get_device_count(const struct device_handler *handler)
 113 {
 114         return handler->n_devices;
 115 }
 116
 117 /**
 118  * device_handler_get_device - Get a handler device by index.
 119  */
 120
 121 const struct discover_device *device_handler_get_device(
 122         const struct device_handler *handler, unsigned int index)
 123 {
 124         if (index >= handler->n_devices) {
 125                 assert(0 && "bad index");
 126                 return NULL;
 127         }
 128
 129         return handler->devices[index];
 130 }
 131
 132 /**
 133  * device_handler_get_plugin_count - Get the count of current handler plugins.
 134  */
 135 int device_handler_get_plugin_count(const struct device_handler *handler)
 136 {
 137         return handler->n_plugins;
 138 }
 139
 140 /**
 141  * discover_handler_get_plugin - Get a handler plugin by index.
 142  */
 143 const struct plugin_option *device_handler_get_plugin(
 144         const struct device_handler *handler, unsigned int index)
 145 {
 146         if (index >= handler->n_plugins) {
 147                 assert(0 && "bad index");
 148                 return NULL;
 149         }
 150
 151         return handler->plugins[index];
 152 }
 153
 154 struct network *device_handler_get_network(
 155                 const struct device_handler *handler)
 156 {
 157         return handler->network;
 158 }
 159
 160 struct discover_boot_option *discover_boot_option_create(
 161                 struct discover_context *ctx,
 162                 struct discover_device *device)
 163 {
 164         struct discover_boot_option *opt;
 165
 166         opt = talloc_zero(ctx, struct discover_boot_option);
 167         opt->option = talloc_zero(opt, struct boot_option);
 168         opt->device = device;
 169
 170         return opt;
 171 }
 172
 173 static int device_match_uuid(struct discover_device *dev, const char *uuid)
 174 {
 175         return dev->uuid && !strcmp(dev->uuid, uuid);
 176 }
 177
 178 static int device_match_label(struct discover_device *dev, const char *label)
 179 {
 180         return dev->label && !strcmp(dev->label, label);
 181 }
 182
 183 static int device_match_id(struct discover_device *dev, const char *id)
 184 {
 185         return !strcmp(dev->device->id, id);
 186 }
 187
 188 static int device_match_serial(struct discover_device *dev, const char *serial)
 189 {
 190         const char *val = discover_device_get_param(dev, "ID_SERIAL");
 191         return val && !strcmp(val, serial);
 192 }
 193
 194 static struct discover_device *device_lookup(
 195                 struct device_handler *device_handler,
 196                 int (match_fn)(struct discover_device *, const char *),
 197                 const char *str)
 198 {
 199         struct discover_device *dev;
 200         unsigned int i;
 201
 202         if (!str)
 203                 return NULL;
 204
 205         for (i = 0; i < device_handler->n_devices; i++) {
 206                 dev = device_handler->devices[i];
 207
 208                 if (match_fn(dev, str))
 209                         return dev;
 210         }
 211
 212         return NULL;
 213 }
 214
 215 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 216                 const char *name)
 217 {
 218         if (!strncmp(name, "/dev/", strlen("/dev/")))
 219                 name += strlen("/dev/");
 220
 221         return device_lookup_by_id(handler, name);
 222 }
 223
 224 struct discover_device *device_lookup_by_uuid(
 225                 struct device_handler *device_handler,
 226                 const char *uuid)
 227 {
 228         return device_lookup(device_handler, device_match_uuid, uuid);
 229 }
 230
 231 struct discover_device *device_lookup_by_label(
 232                 struct device_handler *device_handler,
 233                 const char *label)
 234 {
 235         return device_lookup(device_handler, device_match_label, label);
 236 }
 237
 238 struct discover_device *device_lookup_by_id(
 239                 struct device_handler *device_handler,
 240                 const char *id)
 241 {
 242         return device_lookup(device_handler, device_match_id, id);
 243 }
 244
 245 struct discover_device *device_lookup_by_serial(
 246                 struct device_handler *device_handler,
 247                 const char *serial)
 248 {
 249         return device_lookup(device_handler, device_match_serial, serial);
 250 }
 251
 252 void device_handler_destroy(struct device_handler *handler)
 253 {
 254         talloc_free(handler);
 255 }
 256
 257 static int destroy_device(void *arg)
 258 {
 259         struct discover_device *dev = arg;
 260
 261         umount_device(dev);
 262
 263         return 0;
 264 }
 265
 266 struct discover_device *discover_device_create(struct device_handler *handler,
 267                 const char *uuid, const char *id)
 268 {
 269         struct discover_device *dev;
 270
 271         if (uuid)
 272                 dev = device_lookup_by_uuid(handler, uuid);
 273         else
 274                 dev = device_lookup_by_id(handler, id);
 275
 276         if (dev)
 277                 return dev;
 278
 279         dev = talloc_zero(handler, struct discover_device);
 280         dev->device = talloc_zero(dev, struct device);
 281         dev->device->id = talloc_strdup(dev->device, id);
 282         dev->uuid = talloc_strdup(dev, uuid);
 283         list_init(&dev->params);
 284         list_init(&dev->boot_options);
 285
 286         talloc_set_destructor(dev, destroy_device);
 287
 288         return dev;
 289 }
 290
 291 struct discover_device_param {
 292         char                    *name;
 293         char                    *value;
 294         struct list_item        list;
 295 };
 296
 297 void discover_device_set_param(struct discover_device *device,
 298                 const char *name, const char *value)
 299 {
 300         struct discover_device_param *param;
 301         bool found = false;
 302
 303         list_for_each_entry(&device->params, param, list) {
 304                 if (!strcmp(param->name, name)) {
 305                         found = true;
 306                         break;
 307                 }
 308         }
 309
 310         if (!found) {
 311                 if (!value)
 312                         return;
 313                 param = talloc(device, struct discover_device_param);
 314                 param->name = talloc_strdup(param, name);
 315                 list_add(&device->params, &param->list);
 316         } else {
 317                 if (!value) {
 318                         list_remove(&param->list);
 319                         talloc_free(param);
 320                         return;
 321                 }
 322                 talloc_free(param->value);
 323         }
 324
 325         param->value = talloc_strdup(param, value);
 326 }
 327
 328 const char *discover_device_get_param(struct discover_device *device,
 329                 const char *name)
 330 {
 331         struct discover_device_param *param;
 332
 333         list_for_each_entry(&device->params, param, list) {
 334                 if (!strcmp(param->name, name))
 335                         return param->value;
 336         }
 337         return NULL;
 338 }
 339
 340 struct device_handler *device_handler_init(struct discover_server *server,
 341                 struct waitset *waitset, int dry_run)
 342 {
 343         struct device_handler *handler;
 344         int rc;
 345
 346         handler = talloc_zero(NULL, struct device_handler);
 347         handler->server = server;
 348         handler->waitset = waitset;
 349         handler->dry_run = dry_run;
 350         handler->autoboot_enabled = config_autoboot_active(config_get());
 351
 352         list_init(&handler->unresolved_boot_options);
 353
 354         list_init(&handler->progress);
 355
 356         /* set up our mount point base */
 357         pb_mkdir_recursive(mount_base());
 358
 359         parser_init();
 360
 361         if (config_get()->safe_mode)
 362                 return handler;
 363
 364         rc = device_handler_init_sources(handler);
 365         if (rc) {
 366                 talloc_free(handler);
 367                 return NULL;
 368         }
 369
 370         return handler;
 371 }
 372
 373 void device_handler_reinit(struct device_handler *handler)
 374 {
 375         struct discover_boot_option *opt, *tmp;
 376         struct ramdisk_device *ramdisk;
 377         unsigned int i;
 378
 379         device_handler_cancel_default(handler);
 380         /* Cancel any pending non-default boot */
 381         if (handler->pending_boot) {
 382                 boot_cancel(handler->pending_boot);
 383                 handler->pending_boot = NULL;
 384                 handler->pending_boot_is_default = false;
 385         }
 386
 387         /* Cancel any remaining async jobs */
 388         process_stop_async_all();
 389         pending_network_jobs_cancel();
 390
 391         /* free unresolved boot options */
 392         list_for_each_entry_safe(&handler->unresolved_boot_options,
 393                         opt, tmp, list)
 394                 talloc_free(opt);
 395         list_init(&handler->unresolved_boot_options);
 396
 397         /* drop all devices */
 398         for (i = 0; i < handler->n_devices; i++) {
 399                 discover_server_notify_device_remove(handler->server,
 400                                 handler->devices[i]->device);
 401                 ramdisk = handler->devices[i]->ramdisk;
 402                 talloc_free(handler->devices[i]);
 403                 talloc_free(ramdisk);
 404         }
 405
 406         talloc_free(handler->devices);
 407         handler->devices = NULL;
 408         handler->n_devices = 0;
 409         talloc_free(handler->ramdisks);
 410         handler->ramdisks = NULL;
 411         handler->n_ramdisks = 0;
 412
 413         /* drop any known plugins */
 414         for (i = 0; i < handler->n_plugins; i++)
 415                 talloc_free(handler->plugins[i]);
 416         talloc_free(handler->plugins);
 417         handler->plugins = NULL;
 418         handler->n_plugins = 0;
 419
 420         discover_server_notify_plugins_remove(handler->server);
 421
 422         device_handler_reinit_sources(handler);
 423 }
 424
 425 void device_handler_remove(struct device_handler *handler,
 426                 struct discover_device *device)
 427 {
 428         struct discover_boot_option *opt, *tmp;
 429         unsigned int i;
 430
 431         list_for_each_entry_safe(&device->boot_options, opt, tmp, list) {
 432                 if (opt == handler->default_boot_option) {
 433                         pb_log("Default option %s cancelled since device removed",
 434                                         opt->option->name);
 435                         device_handler_cancel_default(handler);
 436                         break;
 437                 }
 438         }
 439
 440         for (i = 0; i < handler->n_devices; i++)
 441                 if (handler->devices[i] == device)
 442                         break;
 443
 444         if (i == handler->n_devices) {
 445                 talloc_free(device);
 446                 return;
 447         }
 448
 449         /* Free any unresolved options, as they're currently allocated
 450          * against the handler */
 451         list_for_each_entry_safe(&handler->unresolved_boot_options,
 452                         opt, tmp, list) {
 453                 if (opt->device != device)
 454                         continue;
 455                 list_remove(&opt->list);
 456                 talloc_free(opt);
 457         }
 458
 459         /* if this is a network device, we have to unregister it from the
 460          * network code */
 461         if (device->device->type == DEVICE_TYPE_NETWORK)
 462                 network_unregister_device(handler->network, device);
 463
 464         handler->n_devices--;
 465         memmove(&handler->devices[i], &handler->devices[i + 1],
 466                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 467         handler->devices = talloc_realloc(handler, handler->devices,
 468                 struct discover_device *, handler->n_devices);
 469
 470         if (device->notified)
 471                 discover_server_notify_device_remove(handler->server,
 472                                                         device->device);
 473
 474         talloc_free(device);
 475 }
 476
 477 void device_handler_status(struct device_handler *handler,
 478                 struct status *status)
 479 {
 480         discover_server_notify_boot_status(handler->server, status);
 481 }
 482
 483 static void _device_handler_vstatus(struct device_handler *handler,
 484                 enum status_type type, const char *fmt, va_list ap)
 485 {
 486         struct status status;
 487
 488         status.type = type;
 489         status.message = talloc_vasprintf(handler, fmt, ap);
 490         status.backlog = false;
 491
 492         device_handler_status(handler, &status);
 493
 494         talloc_free(status.message);
 495 }
 496
 497 static void _device_handler_vdevstatus(struct device_handler *handler,
 498                 struct discover_device *device, enum status_type type,
 499                 const char *fmt, va_list ap)
 500 {
 501         char *msg;
 502
 503         msg = talloc_asprintf(handler, "[%s] %s",
 504                         device ? device->device->id : "unknown", fmt);
 505         _device_handler_vstatus(handler, type, msg, ap);
 506         talloc_free(msg);
 507 }
 508
 509 void device_handler_status_dev_info(struct device_handler *handler,
 510                 struct discover_device *dev, const char *fmt, ...)
 511 {
 512         va_list ap;
 513
 514         va_start(ap, fmt);
 515         _device_handler_vdevstatus(handler, dev, STATUS_INFO, fmt, ap);
 516         va_end(ap);
 517 }
 518
 519 void device_handler_status_dev_err(struct device_handler *handler,
 520                 struct discover_device *dev, const char *fmt, ...)
 521 {
 522         va_list ap;
 523
 524         va_start(ap, fmt);
 525         _device_handler_vdevstatus(handler, dev, STATUS_ERROR, fmt, ap);
 526         va_end(ap);
 527 }
 528
 529 void device_handler_status_info(struct device_handler *handler,
 530                 const char *fmt, ...)
 531 {
 532         va_list ap;
 533
 534         va_start(ap, fmt);
 535         _device_handler_vstatus(handler, STATUS_INFO, fmt, ap);
 536         va_end(ap);
 537 }
 538
 539 void device_handler_status_err(struct device_handler *handler,
 540                 const char *fmt, ...)
 541 {
 542         va_list ap;
 543
 544         va_start(ap, fmt);
 545         _device_handler_vstatus(handler, STATUS_ERROR, fmt, ap);
 546         va_end(ap);
 547 }
 548
 549 void device_handler_status_download(struct device_handler *handler,
 550                 const struct process_info *procinfo,
 551                 unsigned int percentage, unsigned int size, char suffix)
 552 {
 553         struct progress_info *p, *progress = NULL;
 554         uint64_t current_converted, current = 0;
 555         const char *units = " kMGTP";
 556         unsigned long size_bytes;
 557         char *update = NULL;
 558         double total = 0;
 559         unsigned int i;
 560         int unit = 0;
 561
 562         list_for_each_entry(&handler->progress, p, list)
 563                 if (p->procinfo == procinfo)
 564                         progress = p;
 565
 566         if (!progress) {
 567                 pb_log("Registering new progress struct\n");
 568                 progress = talloc_zero(handler, struct progress_info);
 569                 if (!progress) {
 570                         pb_log("Failed to allocate room for progress struct\n");
 571                         return;
 572                 }
 573                 progress->procinfo = procinfo;
 574                 list_add(&handler->progress, &progress->list);
 575                 handler->n_progress++;
 576         }
 577
 578         size_bytes = size;
 579         for (i = 0; i < strlen(units); i++) {
 580                 if (units[i] == suffix)
 581                         break;
 582         }
 583
 584         if (i >= strlen(units)) {
 585             pb_log("Couldn't recognise suffix '%c'\n", suffix);
 586             size_bytes = 0;
 587         } else {
 588                 while (i--)
 589                         size_bytes <<= 10;
 590         }
 591
 592         progress->percentage = percentage;
 593         progress->size = size_bytes;
 594
 595         /*
 596          * Aggregate the info we have and update status. If a progress struct
 597          * has zero for both percentage and size we assume progress information
 598          * is unavailable and fall back to a generic progress message.
 599          */
 600         list_for_each_entry(&handler->progress, p, list) {
 601                 uint64_t c;
 602                 double t;
 603                 if (!p->percentage || !p->size) {
 604                         update = talloc_asprintf(handler,
 605                                         _("%u downloads in progress..."),
 606                                         handler->n_progress);
 607                         current = total = 0;
 608                         break;
 609                 }
 610
 611                 c = p->size;
 612                 t = (100 * c) / p->percentage;
 613
 614                 current += c;
 615                 total += t;
 616         }
 617
 618         if (total) {
 619                 current_converted = current;
 620                 while (current_converted >= 1000) {
 621                         current_converted >>= 10;
 622                         unit++;
 623                 }
 624                 update = talloc_asprintf(handler,
 625                                 _("%u %s downloading: %.0f%% - %lu%cB"),
 626                                 handler->n_progress,
 627                                 ngettext("item", "items", handler->n_progress),
 628                                 (current / total) * 100, current_converted,
 629                                 units[unit]);
 630         }
 631
 632         if (!update) {
 633                 pb_log("%s: failed to allocate new status\n", __func__);
 634         } else {
 635                 device_handler_status_info(handler, "%s\n", update);
 636                 talloc_free(update);
 637         }
 638 }
 639
 640 void device_handler_status_download_remove(struct device_handler *handler,
 641                 struct process_info *procinfo)
 642 {
 643         struct progress_info *p, *tmp;
 644
 645         list_for_each_entry_safe(&handler->progress, p, tmp, list)
 646                 if (p->procinfo == procinfo) {
 647                         list_remove(&p->list);
 648                         talloc_free(p);
 649                         handler->n_progress--;
 650                 }
 651 }
 652
 653 static void device_handler_boot_status_cb(void *arg, struct status *status)
 654 {
 655         device_handler_status(arg, status);
 656 }
 657
 658 static void countdown_status(struct device_handler *handler,
 659                 struct discover_boot_option *opt, unsigned int sec)
 660 {
 661         struct status status;
 662
 663         status.type = STATUS_INFO;
 664         status.message = talloc_asprintf(handler,
 665                         _("Booting in %d sec: [%s] %s"), sec,
 666                         opt->device->device->id, opt->option->name);
 667         status.backlog = false;
 668
 669         device_handler_status(handler, &status);
 670
 671         talloc_free(status.message);
 672 }
 673
 674 static int default_timeout(void *arg)
 675 {
 676         struct device_handler *handler = arg;
 677         struct discover_boot_option *opt;
 678
 679         if (!handler->default_boot_option)
 680                 return 0;
 681
 682         if (handler->pending_boot)
 683                 return 0;
 684
 685         opt = handler->default_boot_option;
 686
 687         if (handler->sec_to_boot) {
 688                 countdown_status(handler, opt, handler->sec_to_boot);
 689                 handler->sec_to_boot--;
 690                 handler->timeout_waiter = waiter_register_timeout(
 691                                                 handler->waitset, 1000,
 692                                                 default_timeout, handler);
 693                 return 0;
 694         }
 695
 696         handler->timeout_waiter = NULL;
 697
 698         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 699
 700         platform_pre_boot();
 701
 702         handler->pending_boot = boot(handler, handler->default_boot_option,
 703                         NULL, handler->dry_run, device_handler_boot_status_cb,
 704                         handler);
 705         handler->pending_boot_is_default = true;
 706         return 0;
 707 }
 708
 709 struct {
 710         enum ipmi_bootdev       ipmi_type;
 711         enum device_type        device_type;
 712 } device_type_map[] = {
 713         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
 714         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
 715         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_USB },
 716         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
 717 };
 718
 719 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
 720                 enum device_type device_type)
 721 {
 722         unsigned int i;
 723
 724         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
 725                 if (device_type_map[i].device_type == device_type)
 726                         return device_type_map[i].ipmi_type == ipmi_type;
 727         }
 728
 729         return false;
 730 }
 731
 732 static int autoboot_option_priority(const struct config *config,
 733                                 struct discover_boot_option *opt)
 734 {
 735         enum device_type type = opt->device->device->type;
 736         const char *uuid = opt->device->uuid;
 737         struct autoboot_option *auto_opt;
 738         unsigned int i;
 739
 740         for (i = 0; i < config->n_autoboot_opts; i++) {
 741                 auto_opt = &config->autoboot_opts[i];
 742                 if (auto_opt->boot_type == BOOT_DEVICE_UUID)
 743                         if (!strcmp(auto_opt->uuid, uuid))
 744                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 745
 746                 if (auto_opt->boot_type == BOOT_DEVICE_TYPE)
 747                         if (auto_opt->type == type ||
 748                             auto_opt->type == DEVICE_TYPE_ANY)
 749                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 750         }
 751
 752         return -1;
 753 }
 754
 755 /*
 756  * We have different priorities to resolve conflicts between boot options that
 757  * report to be the default for their device. This function assigns a priority
 758  * for these options.
 759  */
 760 static enum default_priority default_option_priority(
 761                 struct discover_boot_option *opt)
 762 {
 763         const struct config *config;
 764
 765         config = config_get();
 766
 767         /* We give highest priority to IPMI-configured boot options. If
 768          * we have an IPMI bootdev configuration set, then we don't allow
 769          * any other defaults */
 770         if (config->ipmi_bootdev) {
 771                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
 772                                 opt->device->device->type);
 773                 if (ipmi_match)
 774                         return DEFAULT_PRIORITY_REMOTE;
 775
 776                 pb_debug("handler: disabled default priority due to "
 777                                 "non-matching IPMI type %x\n",
 778                                 config->ipmi_bootdev);
 779                 return DEFAULT_PRIORITY_DISABLED;
 780         }
 781
 782         /* Next, try to match the option against the user-defined autoboot
 783          * options, either by device UUID or type. */
 784         if (config->n_autoboot_opts) {
 785                 int boot_match = autoboot_option_priority(config, opt);
 786                 if (boot_match > 0)
 787                         return boot_match;
 788         }
 789
 790         /* If the option didn't match any entry in the array, it is disabled */
 791         pb_debug("handler: disabled default priority due to "
 792                         "non-matching UUID or type\n");
 793         return DEFAULT_PRIORITY_DISABLED;
 794 }
 795
 796 static void set_default(struct device_handler *handler,
 797                 struct discover_boot_option *opt)
 798 {
 799         enum default_priority cur_prio, new_prio;
 800
 801         if (!handler->autoboot_enabled)
 802                 return;
 803
 804         pb_debug("handler: new default option: %s\n", opt->option->id);
 805
 806         new_prio = default_option_priority(opt);
 807
 808         /* Anything outside our range prevents a default boot */
 809         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
 810                 return;
 811
 812         pb_debug("handler: calculated priority %d\n", new_prio);
 813
 814         /* Resolve any conflicts: if we have a new default option, it only
 815          * replaces the current if it has a higher priority. */
 816         if (handler->default_boot_option) {
 817
 818                 cur_prio = handler->default_boot_option_priority;
 819
 820                 if (new_prio < cur_prio) {
 821                         pb_log("handler: new prio %d beats "
 822                                         "old prio %d for %s\n",
 823                                         new_prio, cur_prio,
 824                                         handler->default_boot_option
 825                                                 ->option->id);
 826                         handler->default_boot_option = opt;
 827                         handler->default_boot_option_priority = new_prio;
 828                         /* extend the timeout a little, so the user sees some
 829                          * indication of the change */
 830                         handler->sec_to_boot += 2;
 831                 }
 832
 833                 return;
 834         }
 835
 836         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 837         handler->default_boot_option = opt;
 838         handler->default_boot_option_priority = new_prio;
 839
 840         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
 841                opt->option->id, handler->sec_to_boot);
 842
 843         default_timeout(handler);
 844 }
 845
 846 static bool resource_is_resolved(struct resource *res)
 847 {
 848         return !res || res->resolved;
 849 }
 850
 851 /* We only use this in an assert, which will disappear if we're compiling
 852  * with NDEBUG, so we need the 'used' attribute for these builds */
 853 static bool __attribute__((used)) boot_option_is_resolved(
 854                 struct discover_boot_option *opt)
 855 {
 856         return resource_is_resolved(opt->boot_image) &&
 857                 resource_is_resolved(opt->initrd) &&
 858                 resource_is_resolved(opt->dtb) &&
 859                 resource_is_resolved(opt->args_sig_file) &&
 860                 resource_is_resolved(opt->icon);
 861 }
 862
 863 static bool resource_resolve(struct resource *res, const char *name,
 864                 struct discover_boot_option *opt,
 865                 struct device_handler *handler)
 866 {
 867         struct parser *parser = opt->source;
 868
 869         if (resource_is_resolved(res))
 870                 return true;
 871
 872         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 873                         opt->option->id, name, parser->name);
 874         parser->resolve_resource(handler, res);
 875
 876         return res->resolved;
 877 }
 878
 879 static bool boot_option_resolve(struct discover_boot_option *opt,
 880                 struct device_handler *handler)
 881 {
 882         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 883                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 884                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 885                 resource_resolve(opt->args_sig_file, "args_sig_file", opt,
 886                         handler) &&
 887                 resource_resolve(opt->icon, "icon", opt, handler);
 888 }
 889
 890 static void boot_option_finalise(struct device_handler *handler,
 891                 struct discover_boot_option *opt)
 892 {
 893         assert(boot_option_is_resolved(opt));
 894
 895         /* check that the parsers haven't set any of the final data */
 896         assert(!opt->option->boot_image_file);
 897         assert(!opt->option->initrd_file);
 898         assert(!opt->option->dtb_file);
 899         assert(!opt->option->icon_file);
 900         assert(!opt->option->device_id);
 901         assert(!opt->option->args_sig_file);
 902
 903         if (opt->boot_image)
 904                 opt->option->boot_image_file = opt->boot_image->url->full;
 905         if (opt->initrd)
 906                 opt->option->initrd_file = opt->initrd->url->full;
 907         if (opt->dtb)
 908                 opt->option->dtb_file = opt->dtb->url->full;
 909         if (opt->icon)
 910                 opt->option->icon_file = opt->icon->url->full;
 911         if (opt->args_sig_file)
 912                 opt->option->args_sig_file = opt->args_sig_file->url->full;
 913
 914         opt->option->device_id = opt->device->device->id;
 915
 916         if (opt->option->is_default)
 917                 set_default(handler, opt);
 918 }
 919
 920 static void notify_boot_option(struct device_handler *handler,
 921                 struct discover_boot_option *opt)
 922 {
 923         struct discover_device *dev = opt->device;
 924
 925         if (!dev->notified)
 926                 discover_server_notify_device_add(handler->server,
 927                                                   opt->device->device);
 928         dev->notified = true;
 929         discover_server_notify_boot_option_add(handler->server, opt->option);
 930 }
 931
 932 static void process_boot_option_queue(struct device_handler *handler)
 933 {
 934         struct discover_boot_option *opt, *tmp;
 935
 936         list_for_each_entry_safe(&handler->unresolved_boot_options,
 937                         opt, tmp, list) {
 938
 939                 pb_debug("queue: attempting resolution for %s\n",
 940                                 opt->option->id);
 941
 942                 if (!boot_option_resolve(opt, handler))
 943                         continue;
 944
 945                 pb_debug("\tresolved!\n");
 946
 947                 list_remove(&opt->list);
 948                 list_add_tail(&opt->device->boot_options, &opt->list);
 949                 talloc_steal(opt->device, opt);
 950                 boot_option_finalise(handler, opt);
 951                 notify_boot_option(handler, opt);
 952         }
 953 }
 954
 955 struct discover_context *device_handler_discover_context_create(
 956                 struct device_handler *handler,
 957                 struct discover_device *device)
 958 {
 959         struct discover_context *ctx;
 960
 961         ctx = talloc_zero(handler, struct discover_context);
 962         ctx->handler = handler;
 963         ctx->device = device;
 964         list_init(&ctx->boot_options);
 965
 966         return ctx;
 967 }
 968
 969 void device_handler_add_device(struct device_handler *handler,
 970                 struct discover_device *device)
 971 {
 972         handler->n_devices++;
 973         handler->devices = talloc_realloc(handler, handler->devices,
 974                                 struct discover_device *, handler->n_devices);
 975         handler->devices[handler->n_devices - 1] = device;
 976
 977         if (device->device->type == DEVICE_TYPE_NETWORK)
 978                 network_register_device(handler->network, device);
 979 }
 980
 981 void device_handler_add_ramdisk(struct device_handler *handler,
 982                 const char *path)
 983 {
 984         struct ramdisk_device *dev;
 985         unsigned int i;
 986
 987         if (!path)
 988                 return;
 989
 990         for (i = 0; i < handler->n_ramdisks; i++)
 991                 if (!strcmp(handler->ramdisks[i]->path, path))
 992                         return;
 993
 994         dev = talloc_zero(handler, struct ramdisk_device);
 995         if (!dev) {
 996                 pb_log("Failed to allocate memory to track %s\n", path);
 997                 return;
 998         }
 999
1000         dev->path = talloc_strdup(handler, path);
1001
1002         handler->ramdisks = talloc_realloc(handler, handler->ramdisks,
1003                                 struct ramdisk_device *,
1004                                 handler->n_ramdisks + 1);
1005         if (!handler->ramdisks) {
1006                 pb_log("Failed to reallocate memory"
1007                        "- ramdisk tracking inconsistent!\n");
1008                 return;
1009         }
1010
1011         handler->ramdisks[i] = dev;
1012         i = handler->n_ramdisks++;
1013 }
1014
1015 struct ramdisk_device *device_handler_get_ramdisk(
1016                 struct device_handler *handler)
1017 {
1018         unsigned int i;
1019         char *name;
1020         dev_t id;
1021
1022         /* Check if free ramdisk exists */
1023         for (i = 0; i < handler->n_ramdisks; i++)
1024                 if (!handler->ramdisks[i]->snapshot &&
1025                     !handler->ramdisks[i]->origin &&
1026                     !handler->ramdisks[i]->base)
1027                         return handler->ramdisks[i];
1028
1029         /* Otherwise create a new one */
1030         name = talloc_asprintf(handler, "/dev/ram%d",
1031                         handler->n_ramdisks);
1032         if (!name) {
1033                 pb_debug("Failed to allocate memory to name /dev/ram%d",
1034                         handler->n_ramdisks);
1035                 return NULL;
1036         }
1037
1038         id = makedev(1, handler->n_ramdisks);
1039         if (mknod(name, S_IFBLK, id)) {
1040                 if (errno == EEXIST) {
1041                         /* We haven't yet received updates for existing
1042                          * ramdisks - add and use this one */
1043                         pb_debug("Using untracked ramdisk %s\n", name);
1044                 } else {
1045                         pb_log("Failed to create new ramdisk %s: %s\n",
1046                                name, strerror(errno));
1047                         return NULL;
1048                 }
1049         }
1050         device_handler_add_ramdisk(handler, name);
1051         talloc_free(name);
1052
1053         return handler->ramdisks[i];
1054 }
1055
1056 void device_handler_release_ramdisk(struct discover_device *device)
1057 {
1058         struct ramdisk_device *ramdisk = device->ramdisk;
1059
1060         talloc_free(ramdisk->snapshot);
1061         talloc_free(ramdisk->origin);
1062         talloc_free(ramdisk->base);
1063
1064         ramdisk->snapshot = ramdisk->origin = ramdisk->base = NULL;
1065         ramdisk->sectors = 0;
1066
1067         device->ramdisk = NULL;
1068 }
1069
1070 /* Start discovery on a hotplugged device. The device will be in our devices
1071  * array, but has only just been initialised by the hotplug source.
1072  */
1073 int device_handler_discover(struct device_handler *handler,
1074                 struct discover_device *dev)
1075 {
1076         struct discover_context *ctx;
1077         int rc;
1078
1079         device_handler_status_dev_info(handler, dev,
1080                 /*
1081                  * TRANSLATORS: this string will be passed the type of the
1082                  * device (eg "disk" or "network"), which will be translated
1083                  * accordingly.
1084                  */
1085                 _("Processing new %s device"),
1086                 device_type_display_name(dev->device->type));
1087
1088         /* create our context */
1089         ctx = device_handler_discover_context_create(handler, dev);
1090
1091         rc = mount_device(dev);
1092         if (rc)
1093                 goto out;
1094
1095         /* add this device to our system info */
1096         system_info_register_blockdev(dev->device->id, dev->uuid,
1097                         dev->mount_path);
1098
1099         /* run the parsers. This will populate the ctx's boot_option list. */
1100         iterate_parsers(ctx);
1101
1102         /* add discovered stuff to the handler */
1103         device_handler_discover_context_commit(handler, ctx);
1104
1105         process_boot_option_queue(handler);
1106 out:
1107         talloc_unlink(handler, ctx);
1108
1109         return 0;
1110 }
1111
1112 /* Incoming dhcp event */
1113 int device_handler_dhcp(struct device_handler *handler,
1114                 struct discover_device *dev, struct event *event)
1115 {
1116         struct discover_context *ctx;
1117
1118         device_handler_status_dev_info(handler, dev,
1119                         _("Processing DHCP lease response (ip: %s)"),
1120                         event_get_param(event, "ip"));
1121
1122         pending_network_jobs_start();
1123
1124         /* create our context */
1125         ctx = device_handler_discover_context_create(handler, dev);
1126         talloc_steal(ctx, event);
1127         ctx->event = event;
1128
1129         iterate_parsers(ctx);
1130
1131         device_handler_discover_context_commit(handler, ctx);
1132
1133         talloc_unlink(handler, ctx);
1134
1135         return 0;
1136 }
1137
1138 static struct discover_boot_option *find_boot_option_by_id(
1139                 struct device_handler *handler, const char *id)
1140 {
1141         unsigned int i;
1142
1143         for (i = 0; i < handler->n_devices; i++) {
1144                 struct discover_device *dev = handler->devices[i];
1145                 struct discover_boot_option *opt;
1146
1147                 list_for_each_entry(&dev->boot_options, opt, list)
1148                         if (!strcmp(opt->option->id, id))
1149                                 return opt;
1150         }
1151
1152         return NULL;
1153 }
1154
1155 void device_handler_boot(struct device_handler *handler,
1156                 struct boot_command *cmd)
1157 {
1158         struct discover_boot_option *opt = NULL;
1159
1160         if (cmd->option_id && strlen(cmd->option_id))
1161                 opt = find_boot_option_by_id(handler, cmd->option_id);
1162
1163         if (handler->pending_boot)
1164                 boot_cancel(handler->pending_boot);
1165
1166         platform_pre_boot();
1167
1168         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
1169                         device_handler_boot_status_cb, handler);
1170         handler->pending_boot_is_default = false;
1171 }
1172
1173 void device_handler_cancel_default(struct device_handler *handler)
1174 {
1175         if (handler->timeout_waiter)
1176                 waiter_remove(handler->timeout_waiter);
1177
1178         handler->timeout_waiter = NULL;
1179         handler->autoboot_enabled = false;
1180
1181         /* we only send status if we had a default boot option queued */
1182         if (!handler->default_boot_option)
1183                 return;
1184
1185         pb_log("Cancelling default boot option\n");
1186
1187         if (handler->pending_boot && handler->pending_boot_is_default) {
1188                 boot_cancel(handler->pending_boot);
1189                 handler->pending_boot = NULL;
1190                 handler->pending_boot_is_default = false;
1191         }
1192
1193         handler->default_boot_option = NULL;
1194
1195         device_handler_status_info(handler, _("Default boot cancelled"));
1196 }
1197
1198 void device_handler_update_config(struct device_handler *handler,
1199                 struct config *config)
1200 {
1201         int rc;
1202
1203         rc = config_set(config);
1204         if (rc)
1205                 return;
1206
1207         discover_server_notify_config(handler->server, config);
1208         device_handler_update_lang(config->lang);
1209         device_handler_reinit(handler);
1210 }
1211
1212 static char *device_from_addr(void *ctx, struct pb_url *url)
1213 {
1214         char *ipaddr, *buf, *tok, *dev = NULL;
1215         const char *delim = " ";
1216         struct sockaddr_in *ip;
1217         struct sockaddr_in si;
1218         struct addrinfo *res;
1219         struct process *p;
1220         int rc;
1221
1222         /* Note: IPv4 only */
1223         rc = inet_pton(AF_INET, url->host, &(si.sin_addr));
1224         if (rc > 0) {
1225                 ipaddr = url->host;
1226         } else {
1227                 /* need to turn hostname into a valid IP */
1228                 rc = getaddrinfo(url->host, NULL, NULL, &res);
1229                 if (rc) {
1230                         pb_debug("%s: Invalid URL\n",__func__);
1231                         return NULL;
1232                 }
1233                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
1234                 ip = (struct sockaddr_in *) res->ai_addr;
1235                 inet_ntop(AF_INET, &(ip->sin_addr), ipaddr, INET_ADDRSTRLEN);
1236                 freeaddrinfo(res);
1237         }
1238
1239         const char *argv[] = {
1240                 pb_system_apps.ip,
1241                 "route", "show", "to", "match",
1242                 ipaddr,
1243                 NULL
1244         };
1245
1246         p = process_create(ctx);
1247
1248         p->path = pb_system_apps.ip;
1249         p->argv = argv;
1250         p->keep_stdout = true;
1251
1252         rc = process_run_sync(p);
1253
1254         if (rc || p->exit_status) {
1255                 /* ip has complained for some reason; most likely
1256                  * there is no route to the host - bail out */
1257                 pb_debug("%s: `ip` returns non-zero exit status\n", __func__);
1258                 pb_debug("ip buf: %s\n", p->stdout_buf);
1259                 process_release(p);
1260                 return NULL;
1261         }
1262
1263         buf = p->stdout_buf;
1264         /* If a route is found, ip-route output will be of the form
1265          * "... dev DEVNAME ... " */
1266         tok = strtok(buf, delim);
1267         while (tok) {
1268                 if (!strcmp(tok, "dev")) {
1269                         tok = strtok(NULL, delim);
1270                         dev = talloc_strdup(ctx, tok);
1271                         break;
1272                 }
1273                 tok = strtok(NULL, delim);
1274         }
1275
1276         process_release(p);
1277         if (dev)
1278                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
1279         return dev;
1280 }
1281
1282 static void process_url_cb(struct load_url_result *result, void *data)
1283 {
1284         struct device_handler *handler;
1285         struct discover_context *ctx;
1286         struct discover_device *dev;
1287         struct event *event = data;
1288         const char *mac;
1289
1290         if (result->status != LOAD_OK) {
1291                 pb_log("%s: Load failed for %s\n", __func__, result->url->full);
1292                 return;
1293         }
1294
1295         if (!event)
1296                 return;
1297
1298         handler = talloc_parent(event);
1299         if (!handler)
1300                 return;
1301
1302         event->device = device_from_addr(event, result->url);
1303         if (!event->device) {
1304                 pb_log("Downloaded a file but can't find its interface - pretending it was local\n");
1305                 event->device = talloc_asprintf(event, "local");
1306         }
1307
1308         mac = event_get_param(event, "mac");
1309         char *url = talloc_asprintf(event, "file://%s", result->local);
1310         event_set_param(event, "pxeconffile", url);
1311
1312         dev = discover_device_create(handler, mac, event->device);
1313         ctx = device_handler_discover_context_create(handler, dev);
1314         talloc_steal(ctx, event);
1315         ctx->event = event;
1316
1317         iterate_parsers(ctx);
1318
1319         device_handler_discover_context_commit(handler, ctx);
1320
1321         talloc_unlink(handler, ctx);
1322 }
1323
1324 void device_handler_process_url(struct device_handler *handler,
1325                 const char *url, const char *mac, const char *ip)
1326 {
1327         struct discover_context *ctx;
1328         struct discover_device *dev;
1329         bool allow_async = false;
1330         struct pb_url *pb_url;
1331         struct event *event;
1332
1333         event = talloc_zero(handler, struct event);
1334         event->type = EVENT_TYPE_USER;
1335         event->action = EVENT_ACTION_URL;
1336
1337         pb_url = pb_url_parse(event, url);
1338         if (!pb_url || (pb_url->scheme != pb_url_file && !pb_url->host)) {
1339                 device_handler_status_err(handler, _("Invalid config URL!"));
1340                 talloc_free(event);
1341                 return;
1342         }
1343
1344         if (url[strlen(url) - 1] == '/') {
1345                 event_set_param(event, "pxepathprefix", url);
1346                 event_set_param(event, "mac", mac);
1347                 event_set_param(event, "ip", ip);
1348                 event->device = device_from_addr(event, pb_url);
1349                 if (!event->device) {
1350                         device_handler_status_err(handler,
1351                                         _("Unable to route to host %s"),
1352                                         pb_url->host);
1353                         talloc_free(event);
1354                         return;
1355                 }
1356         } else {
1357                 event_set_param(event, "pxeconffile", url);
1358                 allow_async = true;
1359         }
1360
1361         if (pb_url->scheme == pb_url_file)
1362                 event->device = talloc_asprintf(event, "local");
1363         else if (allow_async) {
1364                 /* If file is remote load asynchronously before passing to
1365                  * parser. This allows us to wait for network to be available */
1366                 if (!load_url_async(handler, pb_url, process_url_cb, event,
1367                                         NULL, handler)) {
1368                         pb_log("Failed to load url %s\n", pb_url->full);
1369                         device_handler_status_err(handler, _("Failed to load URL!"));
1370                         talloc_free(event);
1371                 }
1372                 return;
1373         }
1374
1375         /* If path is local we can parse straight away */
1376
1377         dev = discover_device_create(handler, mac, event->device);
1378         if (pb_url->scheme == pb_url_file)
1379                 dev->device->type = DEVICE_TYPE_ANY;
1380         ctx = device_handler_discover_context_create(handler, dev);
1381         talloc_steal(ctx, event);
1382         ctx->event = event;
1383
1384         iterate_parsers(ctx);
1385
1386         device_handler_discover_context_commit(handler, ctx);
1387
1388         talloc_unlink(handler, ctx);
1389 }
1390
1391 #ifndef PETITBOOT_TEST
1392
1393 /**
1394  * context_commit - Commit a temporary discovery context to the handler,
1395  * and notify the clients about any new options / devices
1396  */
1397 void device_handler_discover_context_commit(struct device_handler *handler,
1398                 struct discover_context *ctx)
1399 {
1400         struct discover_device *dev = ctx->device;
1401         struct discover_boot_option *opt, *tmp;
1402
1403         if (!device_lookup_by_uuid(handler, dev->uuid))
1404                 device_handler_add_device(handler, dev);
1405
1406         /* move boot options from the context to the device */
1407         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
1408                 list_remove(&opt->list);
1409
1410                 /* All boot options need at least a kernel image */
1411                 if (!opt->boot_image || !opt->boot_image->url) {
1412                         pb_log("boot option %s is missing boot image, ignoring\n",
1413                                 opt->option->id);
1414                         talloc_free(opt);
1415                         continue;
1416                 }
1417
1418                 if (boot_option_resolve(opt, handler)) {
1419                         pb_log("boot option %s is resolved, "
1420                                         "sending to clients\n",
1421                                         opt->option->id);
1422                         list_add_tail(&dev->boot_options, &opt->list);
1423                         talloc_steal(dev, opt);
1424                         boot_option_finalise(handler, opt);
1425                         notify_boot_option(handler, opt);
1426                 } else {
1427                         if (!opt->source->resolve_resource) {
1428                                 pb_log("parser %s gave us an unresolved "
1429                                         "resource (%s), but no way to "
1430                                         "resolve it\n",
1431                                         opt->source->name, opt->option->id);
1432                                 talloc_free(opt);
1433                         } else {
1434                                 pb_log("boot option %s is unresolved, "
1435                                                 "adding to queue\n",
1436                                                 opt->option->id);
1437                                 list_add(&handler->unresolved_boot_options,
1438                                                 &opt->list);
1439                                 talloc_steal(handler, opt);
1440                         }
1441                 }
1442         }
1443 }
1444
1445 void device_handler_add_plugin_option(struct device_handler *handler,
1446                 struct plugin_option *opt)
1447 {
1448         struct plugin_option *tmp;
1449         unsigned int i;
1450
1451         for (i = 0; i < handler->n_plugins; i++) {
1452                 tmp = handler->plugins[i];
1453                 /* If both id and version match, ignore */
1454                 if (strncmp(opt->id, tmp->id, strlen(opt->id)) == 0 &&
1455                                 strncmp(opt->version, tmp->version,
1456                                         strlen(opt->version) == 0)) {
1457                         pb_log("discover: Plugin '%s' already exists, ignoring\n",
1458                                         opt->id);
1459                         return;
1460                 }
1461         }
1462
1463         handler->plugins = talloc_realloc(handler, handler->plugins,
1464                         struct plugin_option *, handler->n_plugins + 1);
1465         if (!handler->plugins) {
1466                 pb_log("Failed to allocate memory for new plugin\n");
1467                 handler->n_plugins = 0;
1468                 return;
1469         }
1470
1471         handler->plugins[handler->n_plugins++] = opt;
1472         discover_server_notify_plugin_option_add(handler->server, opt);
1473 }
1474
1475 static void device_handler_update_lang(const char *lang)
1476 {
1477         const char *cur_lang;
1478
1479         if (!lang)
1480                 return;
1481
1482         cur_lang = setlocale(LC_ALL, NULL);
1483         if (cur_lang && !strcmp(cur_lang, lang))
1484                 return;
1485
1486         setlocale(LC_ALL, lang);
1487 }
1488
1489 static int device_handler_init_sources(struct device_handler *handler)
1490 {
1491         /* init our device sources: udev, network and user events */
1492         handler->network = network_init(handler, handler->waitset,
1493                         handler->dry_run);
1494         if (!handler->network)
1495                 return -1;
1496
1497         handler->udev = udev_init(handler, handler->waitset);
1498         if (!handler->udev)
1499                 return -1;
1500
1501         handler->user_event = user_event_init(handler, handler->waitset);
1502         if (!handler->user_event)
1503                 return -1;
1504
1505         return 0;
1506 }
1507
1508 static void device_handler_reinit_sources(struct device_handler *handler)
1509 {
1510         /* if we haven't initialised sources previously (becuase we started in
1511          * safe mode), then init once here. */
1512         if (!(handler->udev || handler->network || handler->user_event)) {
1513                 device_handler_init_sources(handler);
1514                 return;
1515         }
1516
1517         system_info_reinit();
1518
1519         network_shutdown(handler->network);
1520         handler->network = network_init(handler, handler->waitset,
1521                         handler->dry_run);
1522
1523         udev_reinit(handler->udev);
1524 }
1525
1526 static inline const char *get_device_path(struct discover_device *dev)
1527 {
1528         return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
1529 }
1530
1531 static char *check_subvols(struct discover_device *dev)
1532 {
1533         const char *fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1534         struct stat sb;
1535         char *path;
1536         int rc;
1537
1538         if (strncmp(fstype, "btrfs", strlen("btrfs")))
1539                 return dev->mount_path;
1540
1541         /* On btrfs a device's root may be under a subvolume path */
1542         path = join_paths(dev, dev->mount_path, "@");
1543         rc = stat(path, &sb);
1544         if (!rc && S_ISDIR(sb.st_mode)) {
1545                 pb_debug("Using '%s' for btrfs root path\n", path);
1546                 return path;
1547         }
1548
1549         talloc_free(path);
1550         return dev->mount_path;
1551 }
1552
1553 static bool check_existing_mount(struct discover_device *dev)
1554 {
1555         struct stat devstat, mntstat;
1556         const char *device_path;
1557         struct mntent *mnt;
1558         FILE *fp;
1559         int rc;
1560
1561         device_path = get_device_path(dev);
1562
1563         rc = stat(device_path, &devstat);
1564         if (rc) {
1565                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1566                 return false;
1567         }
1568
1569         if (!S_ISBLK(devstat.st_mode)) {
1570                 pb_debug("%s: %s isn't a block device?\n", __func__,
1571                                 dev->device_path);
1572                 return false;
1573         }
1574
1575         fp = fopen("/proc/self/mounts", "r");
1576
1577         for (;;) {
1578                 mnt = getmntent(fp);
1579                 if (!mnt)
1580                         break;
1581
1582                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1583                         continue;
1584
1585                 rc = stat(mnt->mnt_fsname, &mntstat);
1586                 if (rc)
1587                         continue;
1588
1589                 if (!S_ISBLK(mntstat.st_mode))
1590                         continue;
1591
1592                 if (mntstat.st_rdev == devstat.st_rdev) {
1593                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1594                         dev->root_path = check_subvols(dev);
1595                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1596                         dev->mounted = true;
1597                         dev->unmount = false;
1598
1599                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1600                                         __func__, dev->device_path,
1601                                         dev->mounted_rw ? 'w' : 'o',
1602                                         mnt->mnt_dir);
1603                         break;
1604                 }
1605         }
1606
1607         fclose(fp);
1608
1609         return mnt != NULL;
1610 }
1611
1612 /*
1613  * Attempt to mount a filesystem safely, while handling certain filesytem-
1614  * specific options
1615  */
1616 static int try_mount(const char *device_path, const char *mount_path,
1617                              const char *fstype, unsigned long flags,
1618                              bool have_snapshot)
1619 {
1620         const char *fs, *safe_opts;
1621         int rc;
1622
1623         /* Mount ext3 as ext4 instead so 'norecovery' can be used */
1624         if (strncmp(fstype, "ext3", strlen("ext3")) == 0) {
1625                 pb_debug("Mounting ext3 filesystem as ext4\n");
1626                 fs = "ext4";
1627         } else
1628                 fs = fstype;
1629
1630         if (strncmp(fs, "xfs", strlen("xfs")) == 0 ||
1631             strncmp(fs, "ext4", strlen("ext4")) == 0)
1632                 safe_opts = "norecovery";
1633         else
1634                 safe_opts = NULL;
1635
1636         errno = 0;
1637         /* If no snapshot is available don't attempt recovery */
1638         if (!have_snapshot)
1639                 return mount(device_path, mount_path, fs, flags, safe_opts);
1640
1641         rc = mount(device_path, mount_path, fs, flags, NULL);
1642
1643         if (!rc)
1644                 return rc;
1645
1646         /* Mounting failed; some filesystems will fail to mount if a recovery
1647          * journal exists (eg. cross-endian XFS), so try again with norecovery
1648          * where that option is available.
1649          * If mounting read-write just return the error as norecovery is not a
1650          * valid option */
1651         if ((flags & MS_RDONLY) != MS_RDONLY || !safe_opts)
1652                 return rc;
1653
1654         errno = 0;
1655         return mount(device_path, mount_path, fs, flags, safe_opts);
1656 }
1657
1658 static int mount_device(struct discover_device *dev)
1659 {
1660         const char *fstype, *device_path;
1661         int rc;
1662
1663         if (!dev->device_path)
1664                 return -1;
1665
1666         if (dev->mounted)
1667                 return 0;
1668
1669         if (check_existing_mount(dev))
1670                 return 0;
1671
1672         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1673         if (!fstype)
1674                 return 0;
1675
1676         dev->mount_path = join_paths(dev, mount_base(),
1677                                         dev->device_path);
1678
1679         if (pb_mkdir_recursive(dev->mount_path)) {
1680                 pb_log("couldn't create mount directory %s: %s\n",
1681                                 dev->mount_path, strerror(errno));
1682                 goto err_free;
1683         }
1684
1685         device_path = get_device_path(dev);
1686
1687         pb_log("mounting device %s read-only\n", dev->device_path);
1688         rc = try_mount(device_path, dev->mount_path, fstype,
1689                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1690
1691         if (!rc) {
1692                 dev->mounted = true;
1693                 dev->mounted_rw = false;
1694                 dev->unmount = true;
1695                 dev->root_path = check_subvols(dev);
1696                 return 0;
1697         }
1698
1699         pb_log("couldn't mount device %s: mount failed: %s\n",
1700                         device_path, strerror(errno));
1701
1702         /* If mount fails clean up any snapshot */
1703         devmapper_destroy_snapshot(dev);
1704
1705         pb_rmdir_recursive(mount_base(), dev->mount_path);
1706 err_free:
1707         talloc_free(dev->mount_path);
1708         dev->mount_path = NULL;
1709         return -1;
1710 }
1711
1712 static int umount_device(struct discover_device *dev)
1713 {
1714         const char *device_path;
1715         int rc;
1716
1717         if (!dev->mounted || !dev->unmount)
1718                 return 0;
1719
1720         device_path = get_device_path(dev);
1721
1722         pb_log("unmounting device %s\n", device_path);
1723         rc = umount(dev->mount_path);
1724         if (rc)
1725                 return -1;
1726
1727         dev->mounted = false;
1728         devmapper_destroy_snapshot(dev);
1729
1730         pb_rmdir_recursive(mount_base(), dev->mount_path);
1731
1732         talloc_free(dev->mount_path);
1733         dev->mount_path = NULL;
1734         dev->root_path = NULL;
1735
1736         return 0;
1737 }
1738
1739 int device_request_write(struct discover_device *dev, bool *release)
1740 {
1741         const char *fstype, *device_path;
1742         const struct config *config;
1743         int rc;
1744
1745         *release = false;
1746
1747         config = config_get();
1748         if (!config->allow_writes)
1749                 return -1;
1750
1751         if (!dev->mounted)
1752                 return -1;
1753
1754         if (dev->mounted_rw)
1755                 return 0;
1756
1757         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1758
1759         device_path = get_device_path(dev);
1760
1761         pb_log("remounting device %s read-write\n", device_path);
1762
1763         rc = umount(dev->mount_path);
1764         if (rc) {
1765                 pb_log("Failed to unmount %s: %s\n",
1766                        dev->mount_path, strerror(errno));
1767                 return -1;
1768         }
1769
1770         rc = try_mount(device_path, dev->mount_path, fstype,
1771                        MS_SILENT, dev->ramdisk);
1772         if (rc)
1773                 goto mount_ro;
1774
1775         dev->mounted_rw = true;
1776         *release = true;
1777         return 0;
1778
1779 mount_ro:
1780         pb_log("Unable to remount device %s read-write: %s\n",
1781                device_path, strerror(errno));
1782         rc = try_mount(device_path, dev->mount_path, fstype,
1783                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1784         if (rc)
1785                 pb_log("Unable to recover mount for %s: %s\n",
1786                        device_path, strerror(errno));
1787         return -1;
1788 }
1789
1790 void device_release_write(struct discover_device *dev, bool release)
1791 {
1792         const char *fstype, *device_path;
1793
1794         if (!release)
1795                 return;
1796
1797         device_path = get_device_path(dev);
1798
1799         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1800
1801         pb_log("remounting device %s read-only\n", device_path);
1802
1803         if (umount(dev->mount_path)) {
1804                 pb_log("Failed to unmount %s\n", dev->mount_path);
1805                 return;
1806         }
1807         dev->mounted_rw = dev->mounted = false;
1808
1809         if (dev->ramdisk) {
1810                 devmapper_merge_snapshot(dev);
1811                 /* device_path becomes stale after merge */
1812                 device_path = get_device_path(dev);
1813         }
1814
1815         if (try_mount(device_path, dev->mount_path, fstype,
1816                        MS_RDONLY | MS_SILENT, dev->ramdisk))
1817                 pb_log("Failed to remount %s read-only: %s\n",
1818                        device_path, strerror(errno));
1819         else
1820                 dev->mounted = true;
1821 }
1822
1823 void device_sync_snapshots(struct device_handler *handler, const char *device)
1824 {
1825         struct discover_device *dev = NULL;
1826         unsigned int i;
1827
1828         if (device) {
1829                 /* Find matching device and sync */
1830                 dev = device_lookup_by_name(handler, device);
1831                 if (!dev) {
1832                         pb_log("%s: device name '%s' unrecognised\n",
1833                                 __func__, device);
1834                         return;
1835                 }
1836                 if (dev->ramdisk)
1837                         device_release_write(dev, true);
1838                 else
1839                         pb_log("%s has no snapshot to merge, skipping\n",
1840                                 dev->device->id);
1841                 return;
1842         }
1843
1844         /* Otherwise sync all relevant devices */
1845         for (i = 0; i < handler->n_devices; i++) {
1846                 dev = handler->devices[i];
1847                 if (dev->device->type != DEVICE_TYPE_DISK &&
1848                         dev->device->type != DEVICE_TYPE_USB)
1849                         continue;
1850                 if (dev->ramdisk)
1851                         device_release_write(dev, true);
1852                 else
1853                         pb_log("%s has no snapshot to merge, skipping\n",
1854                                 dev->device->id);
1855         }
1856 }
1857
1858 #else
1859
1860 void device_handler_discover_context_commit(
1861                 struct device_handler *handler __attribute__((unused)),
1862                 struct discover_context *ctx __attribute__((unused)))
1863 {
1864         pb_log("%s stubbed out for test cases\n", __func__);
1865 }
1866
1867 static void device_handler_update_lang(const char *lang __attribute__((unused)))
1868 {
1869 }
1870
1871 static int device_handler_init_sources(
1872                 struct device_handler *handler __attribute__((unused)))
1873 {
1874         return 0;
1875 }
1876
1877 static void device_handler_reinit_sources(
1878                 struct device_handler *handler __attribute__((unused)))
1879 {
1880 }
1881
1882 static int umount_device(struct discover_device *dev __attribute__((unused)))
1883 {
1884         return 0;
1885 }
1886
1887 static int __attribute__((unused)) mount_device(
1888                 struct discover_device *dev __attribute__((unused)))
1889 {
1890         return 0;
1891 }
1892
1893 int device_request_write(struct discover_device *dev __attribute__((unused)),
1894                 bool *release)
1895 {
1896         *release = true;
1897         return 0;
1898 }
1899
1900 void device_release_write(struct discover_device *dev __attribute__((unused)),
1901         bool release __attribute__((unused)))
1902 {
1903 }
1904
1905 void device_sync_snapshots(
1906                 struct device_handler *handler __attribute__((unused)),
1907                 const char *device __attribute__((unused)))
1908 {
1909 }
1910
1911 #endif