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 static void device_handler_plugin_scan_device(struct device_handler *handler,
 641                 struct discover_device *dev)
 642 {
 643         int rc;
 644
 645         pb_debug("Scanning %s for plugin files\n", dev->device->id);
 646
 647         rc = process_run_simple(handler, pb_system_apps.pb_plugin,
 648                                 "scan", dev->mount_path,
 649                                 NULL);
 650         if (rc)
 651                 pb_log("Error from pb-plugin scan %s\n",
 652                                 dev->mount_path);
 653 }
 654
 655 void device_handler_status_download_remove(struct device_handler *handler,
 656                 struct process_info *procinfo)
 657 {
 658         struct progress_info *p, *tmp;
 659
 660         list_for_each_entry_safe(&handler->progress, p, tmp, list)
 661                 if (p->procinfo == procinfo) {
 662                         list_remove(&p->list);
 663                         talloc_free(p);
 664                         handler->n_progress--;
 665                 }
 666 }
 667
 668 static void device_handler_boot_status_cb(void *arg, struct status *status)
 669 {
 670         device_handler_status(arg, status);
 671 }
 672
 673 static void countdown_status(struct device_handler *handler,
 674                 struct discover_boot_option *opt, unsigned int sec)
 675 {
 676         struct status status;
 677
 678         status.type = STATUS_INFO;
 679         status.message = talloc_asprintf(handler,
 680                         _("Booting in %d sec: [%s] %s"), sec,
 681                         opt->device->device->id, opt->option->name);
 682         status.backlog = false;
 683
 684         device_handler_status(handler, &status);
 685
 686         talloc_free(status.message);
 687 }
 688
 689 static int default_timeout(void *arg)
 690 {
 691         struct device_handler *handler = arg;
 692         struct discover_boot_option *opt;
 693
 694         if (!handler->default_boot_option)
 695                 return 0;
 696
 697         if (handler->pending_boot)
 698                 return 0;
 699
 700         opt = handler->default_boot_option;
 701
 702         if (handler->sec_to_boot) {
 703                 countdown_status(handler, opt, handler->sec_to_boot);
 704                 handler->sec_to_boot--;
 705                 handler->timeout_waiter = waiter_register_timeout(
 706                                                 handler->waitset, 1000,
 707                                                 default_timeout, handler);
 708                 return 0;
 709         }
 710
 711         handler->timeout_waiter = NULL;
 712
 713         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 714
 715         platform_pre_boot();
 716
 717         handler->pending_boot = boot(handler, handler->default_boot_option,
 718                         NULL, handler->dry_run, device_handler_boot_status_cb,
 719                         handler);
 720         handler->pending_boot_is_default = true;
 721         return 0;
 722 }
 723
 724 struct {
 725         enum ipmi_bootdev       ipmi_type;
 726         enum device_type        device_type;
 727 } device_type_map[] = {
 728         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
 729         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
 730         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_USB },
 731         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
 732 };
 733
 734 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
 735                 enum device_type device_type)
 736 {
 737         unsigned int i;
 738
 739         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
 740                 if (device_type_map[i].device_type == device_type)
 741                         return device_type_map[i].ipmi_type == ipmi_type;
 742         }
 743
 744         return false;
 745 }
 746
 747 static int autoboot_option_priority(const struct config *config,
 748                                 struct discover_boot_option *opt)
 749 {
 750         enum device_type type = opt->device->device->type;
 751         const char *uuid = opt->device->uuid;
 752         struct autoboot_option *auto_opt;
 753         unsigned int i;
 754
 755         for (i = 0; i < config->n_autoboot_opts; i++) {
 756                 auto_opt = &config->autoboot_opts[i];
 757                 if (auto_opt->boot_type == BOOT_DEVICE_UUID)
 758                         if (!strcmp(auto_opt->uuid, uuid))
 759                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 760
 761                 if (auto_opt->boot_type == BOOT_DEVICE_TYPE)
 762                         if (auto_opt->type == type ||
 763                             auto_opt->type == DEVICE_TYPE_ANY)
 764                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 765         }
 766
 767         return -1;
 768 }
 769
 770 /*
 771  * We have different priorities to resolve conflicts between boot options that
 772  * report to be the default for their device. This function assigns a priority
 773  * for these options.
 774  */
 775 static enum default_priority default_option_priority(
 776                 struct discover_boot_option *opt)
 777 {
 778         const struct config *config;
 779
 780         config = config_get();
 781
 782         /* We give highest priority to IPMI-configured boot options. If
 783          * we have an IPMI bootdev configuration set, then we don't allow
 784          * any other defaults */
 785         if (config->ipmi_bootdev) {
 786                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
 787                                 opt->device->device->type);
 788                 if (ipmi_match)
 789                         return DEFAULT_PRIORITY_REMOTE;
 790
 791                 pb_debug("handler: disabled default priority due to "
 792                                 "non-matching IPMI type %x\n",
 793                                 config->ipmi_bootdev);
 794                 return DEFAULT_PRIORITY_DISABLED;
 795         }
 796
 797         /* Next, try to match the option against the user-defined autoboot
 798          * options, either by device UUID or type. */
 799         if (config->n_autoboot_opts) {
 800                 int boot_match = autoboot_option_priority(config, opt);
 801                 if (boot_match > 0)
 802                         return boot_match;
 803         }
 804
 805         /* If the option didn't match any entry in the array, it is disabled */
 806         pb_debug("handler: disabled default priority due to "
 807                         "non-matching UUID or type\n");
 808         return DEFAULT_PRIORITY_DISABLED;
 809 }
 810
 811 static void set_default(struct device_handler *handler,
 812                 struct discover_boot_option *opt)
 813 {
 814         enum default_priority cur_prio, new_prio;
 815
 816         if (!handler->autoboot_enabled)
 817                 return;
 818
 819         pb_debug("handler: new default option: %s\n", opt->option->id);
 820
 821         new_prio = default_option_priority(opt);
 822
 823         /* Anything outside our range prevents a default boot */
 824         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
 825                 return;
 826
 827         pb_debug("handler: calculated priority %d\n", new_prio);
 828
 829         /* Resolve any conflicts: if we have a new default option, it only
 830          * replaces the current if it has a higher priority. */
 831         if (handler->default_boot_option) {
 832
 833                 cur_prio = handler->default_boot_option_priority;
 834
 835                 if (new_prio < cur_prio) {
 836                         pb_log("handler: new prio %d beats "
 837                                         "old prio %d for %s\n",
 838                                         new_prio, cur_prio,
 839                                         handler->default_boot_option
 840                                                 ->option->id);
 841                         handler->default_boot_option = opt;
 842                         handler->default_boot_option_priority = new_prio;
 843                         /* extend the timeout a little, so the user sees some
 844                          * indication of the change */
 845                         handler->sec_to_boot += 2;
 846                 }
 847
 848                 return;
 849         }
 850
 851         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 852         handler->default_boot_option = opt;
 853         handler->default_boot_option_priority = new_prio;
 854
 855         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
 856                opt->option->id, handler->sec_to_boot);
 857
 858         default_timeout(handler);
 859 }
 860
 861 static bool resource_is_resolved(struct resource *res)
 862 {
 863         return !res || res->resolved;
 864 }
 865
 866 /* We only use this in an assert, which will disappear if we're compiling
 867  * with NDEBUG, so we need the 'used' attribute for these builds */
 868 static bool __attribute__((used)) boot_option_is_resolved(
 869                 struct discover_boot_option *opt)
 870 {
 871         return resource_is_resolved(opt->boot_image) &&
 872                 resource_is_resolved(opt->initrd) &&
 873                 resource_is_resolved(opt->dtb) &&
 874                 resource_is_resolved(opt->args_sig_file) &&
 875                 resource_is_resolved(opt->icon);
 876 }
 877
 878 static bool resource_resolve(struct resource *res, const char *name,
 879                 struct discover_boot_option *opt,
 880                 struct device_handler *handler)
 881 {
 882         struct parser *parser = opt->source;
 883
 884         if (resource_is_resolved(res))
 885                 return true;
 886
 887         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 888                         opt->option->id, name, parser->name);
 889         parser->resolve_resource(handler, res);
 890
 891         return res->resolved;
 892 }
 893
 894 static bool boot_option_resolve(struct discover_boot_option *opt,
 895                 struct device_handler *handler)
 896 {
 897         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 898                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 899                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 900                 resource_resolve(opt->args_sig_file, "args_sig_file", opt,
 901                         handler) &&
 902                 resource_resolve(opt->icon, "icon", opt, handler);
 903 }
 904
 905 static void boot_option_finalise(struct device_handler *handler,
 906                 struct discover_boot_option *opt)
 907 {
 908         assert(boot_option_is_resolved(opt));
 909
 910         /* check that the parsers haven't set any of the final data */
 911         assert(!opt->option->boot_image_file);
 912         assert(!opt->option->initrd_file);
 913         assert(!opt->option->dtb_file);
 914         assert(!opt->option->icon_file);
 915         assert(!opt->option->device_id);
 916         assert(!opt->option->args_sig_file);
 917
 918         if (opt->boot_image)
 919                 opt->option->boot_image_file = opt->boot_image->url->full;
 920         if (opt->initrd)
 921                 opt->option->initrd_file = opt->initrd->url->full;
 922         if (opt->dtb)
 923                 opt->option->dtb_file = opt->dtb->url->full;
 924         if (opt->icon)
 925                 opt->option->icon_file = opt->icon->url->full;
 926         if (opt->args_sig_file)
 927                 opt->option->args_sig_file = opt->args_sig_file->url->full;
 928
 929         opt->option->device_id = opt->device->device->id;
 930
 931         if (opt->option->is_default)
 932                 set_default(handler, opt);
 933 }
 934
 935 static void notify_boot_option(struct device_handler *handler,
 936                 struct discover_boot_option *opt)
 937 {
 938         struct discover_device *dev = opt->device;
 939
 940         if (!dev->notified)
 941                 discover_server_notify_device_add(handler->server,
 942                                                   opt->device->device);
 943         dev->notified = true;
 944         discover_server_notify_boot_option_add(handler->server, opt->option);
 945 }
 946
 947 static void process_boot_option_queue(struct device_handler *handler)
 948 {
 949         struct discover_boot_option *opt, *tmp;
 950
 951         list_for_each_entry_safe(&handler->unresolved_boot_options,
 952                         opt, tmp, list) {
 953
 954                 pb_debug("queue: attempting resolution for %s\n",
 955                                 opt->option->id);
 956
 957                 if (!boot_option_resolve(opt, handler))
 958                         continue;
 959
 960                 pb_debug("\tresolved!\n");
 961
 962                 list_remove(&opt->list);
 963                 list_add_tail(&opt->device->boot_options, &opt->list);
 964                 talloc_steal(opt->device, opt);
 965                 boot_option_finalise(handler, opt);
 966                 notify_boot_option(handler, opt);
 967         }
 968 }
 969
 970 struct discover_context *device_handler_discover_context_create(
 971                 struct device_handler *handler,
 972                 struct discover_device *device)
 973 {
 974         struct discover_context *ctx;
 975
 976         ctx = talloc_zero(handler, struct discover_context);
 977         ctx->handler = handler;
 978         ctx->device = device;
 979         list_init(&ctx->boot_options);
 980
 981         return ctx;
 982 }
 983
 984 void device_handler_add_device(struct device_handler *handler,
 985                 struct discover_device *device)
 986 {
 987         handler->n_devices++;
 988         handler->devices = talloc_realloc(handler, handler->devices,
 989                                 struct discover_device *, handler->n_devices);
 990         handler->devices[handler->n_devices - 1] = device;
 991
 992         if (device->device->type == DEVICE_TYPE_NETWORK)
 993                 network_register_device(handler->network, device);
 994 }
 995
 996 void device_handler_add_ramdisk(struct device_handler *handler,
 997                 const char *path)
 998 {
 999         struct ramdisk_device *dev;
1000         unsigned int i;
1001
1002         if (!path)
1003                 return;
1004
1005         for (i = 0; i < handler->n_ramdisks; i++)
1006                 if (!strcmp(handler->ramdisks[i]->path, path))
1007                         return;
1008
1009         dev = talloc_zero(handler, struct ramdisk_device);
1010         if (!dev) {
1011                 pb_log("Failed to allocate memory to track %s\n", path);
1012                 return;
1013         }
1014
1015         dev->path = talloc_strdup(handler, path);
1016
1017         handler->ramdisks = talloc_realloc(handler, handler->ramdisks,
1018                                 struct ramdisk_device *,
1019                                 handler->n_ramdisks + 1);
1020         if (!handler->ramdisks) {
1021                 pb_log("Failed to reallocate memory"
1022                        "- ramdisk tracking inconsistent!\n");
1023                 return;
1024         }
1025
1026         handler->ramdisks[i] = dev;
1027         i = handler->n_ramdisks++;
1028 }
1029
1030 struct ramdisk_device *device_handler_get_ramdisk(
1031                 struct device_handler *handler)
1032 {
1033         unsigned int i;
1034         char *name;
1035         dev_t id;
1036
1037         /* Check if free ramdisk exists */
1038         for (i = 0; i < handler->n_ramdisks; i++)
1039                 if (!handler->ramdisks[i]->snapshot &&
1040                     !handler->ramdisks[i]->origin &&
1041                     !handler->ramdisks[i]->base)
1042                         return handler->ramdisks[i];
1043
1044         /* Otherwise create a new one */
1045         name = talloc_asprintf(handler, "/dev/ram%d",
1046                         handler->n_ramdisks);
1047         if (!name) {
1048                 pb_debug("Failed to allocate memory to name /dev/ram%d",
1049                         handler->n_ramdisks);
1050                 return NULL;
1051         }
1052
1053         id = makedev(1, handler->n_ramdisks);
1054         if (mknod(name, S_IFBLK, id)) {
1055                 if (errno == EEXIST) {
1056                         /* We haven't yet received updates for existing
1057                          * ramdisks - add and use this one */
1058                         pb_debug("Using untracked ramdisk %s\n", name);
1059                 } else {
1060                         pb_log("Failed to create new ramdisk %s: %s\n",
1061                                name, strerror(errno));
1062                         return NULL;
1063                 }
1064         }
1065         device_handler_add_ramdisk(handler, name);
1066         talloc_free(name);
1067
1068         return handler->ramdisks[i];
1069 }
1070
1071 void device_handler_release_ramdisk(struct discover_device *device)
1072 {
1073         struct ramdisk_device *ramdisk = device->ramdisk;
1074
1075         talloc_free(ramdisk->snapshot);
1076         talloc_free(ramdisk->origin);
1077         talloc_free(ramdisk->base);
1078
1079         ramdisk->snapshot = ramdisk->origin = ramdisk->base = NULL;
1080         ramdisk->sectors = 0;
1081
1082         device->ramdisk = NULL;
1083 }
1084
1085 /* Start discovery on a hotplugged device. The device will be in our devices
1086  * array, but has only just been initialised by the hotplug source.
1087  */
1088 int device_handler_discover(struct device_handler *handler,
1089                 struct discover_device *dev)
1090 {
1091         struct discover_context *ctx;
1092         int rc;
1093
1094         device_handler_status_dev_info(handler, dev,
1095                 /*
1096                  * TRANSLATORS: this string will be passed the type of the
1097                  * device (eg "disk" or "network"), which will be translated
1098                  * accordingly.
1099                  */
1100                 _("Processing new %s device"),
1101                 device_type_display_name(dev->device->type));
1102
1103         /* create our context */
1104         ctx = device_handler_discover_context_create(handler, dev);
1105
1106         rc = mount_device(dev);
1107         if (rc)
1108                 goto out;
1109
1110         /* add this device to our system info */
1111         system_info_register_blockdev(dev->device->id, dev->uuid,
1112                         dev->mount_path);
1113
1114         /* run the parsers. This will populate the ctx's boot_option list. */
1115         iterate_parsers(ctx);
1116
1117         /* add discovered stuff to the handler */
1118         device_handler_discover_context_commit(handler, ctx);
1119
1120         process_boot_option_queue(handler);
1121
1122         /* Check this device for pb-plugins */
1123         device_handler_plugin_scan_device(handler, dev);
1124 out:
1125         talloc_unlink(handler, ctx);
1126
1127         return 0;
1128 }
1129
1130 /* Incoming dhcp event */
1131 int device_handler_dhcp(struct device_handler *handler,
1132                 struct discover_device *dev, struct event *event)
1133 {
1134         struct discover_context *ctx;
1135
1136         device_handler_status_dev_info(handler, dev,
1137                         _("Processing DHCP lease response (ip: %s)"),
1138                         event_get_param(event, "ip"));
1139
1140         pending_network_jobs_start();
1141
1142         /* create our context */
1143         ctx = device_handler_discover_context_create(handler, dev);
1144         talloc_steal(ctx, event);
1145         ctx->event = event;
1146
1147         iterate_parsers(ctx);
1148
1149         device_handler_discover_context_commit(handler, ctx);
1150
1151         talloc_unlink(handler, ctx);
1152
1153         return 0;
1154 }
1155
1156 static struct discover_boot_option *find_boot_option_by_id(
1157                 struct device_handler *handler, const char *id)
1158 {
1159         unsigned int i;
1160
1161         for (i = 0; i < handler->n_devices; i++) {
1162                 struct discover_device *dev = handler->devices[i];
1163                 struct discover_boot_option *opt;
1164
1165                 list_for_each_entry(&dev->boot_options, opt, list)
1166                         if (!strcmp(opt->option->id, id))
1167                                 return opt;
1168         }
1169
1170         return NULL;
1171 }
1172
1173 void device_handler_boot(struct device_handler *handler,
1174                 struct boot_command *cmd)
1175 {
1176         struct discover_boot_option *opt = NULL;
1177
1178         if (cmd->option_id && strlen(cmd->option_id))
1179                 opt = find_boot_option_by_id(handler, cmd->option_id);
1180
1181         if (handler->pending_boot)
1182                 boot_cancel(handler->pending_boot);
1183
1184         platform_pre_boot();
1185
1186         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
1187                         device_handler_boot_status_cb, handler);
1188         handler->pending_boot_is_default = false;
1189 }
1190
1191 void device_handler_cancel_default(struct device_handler *handler)
1192 {
1193         if (handler->timeout_waiter)
1194                 waiter_remove(handler->timeout_waiter);
1195
1196         handler->timeout_waiter = NULL;
1197         handler->autoboot_enabled = false;
1198
1199         /* we only send status if we had a default boot option queued */
1200         if (!handler->default_boot_option)
1201                 return;
1202
1203         pb_log("Cancelling default boot option\n");
1204
1205         if (handler->pending_boot && handler->pending_boot_is_default) {
1206                 boot_cancel(handler->pending_boot);
1207                 handler->pending_boot = NULL;
1208                 handler->pending_boot_is_default = false;
1209         }
1210
1211         handler->default_boot_option = NULL;
1212
1213         device_handler_status_info(handler, _("Default boot cancelled"));
1214 }
1215
1216 void device_handler_update_config(struct device_handler *handler,
1217                 struct config *config)
1218 {
1219         int rc;
1220
1221         rc = config_set(config);
1222         if (rc)
1223                 return;
1224
1225         discover_server_notify_config(handler->server, config);
1226         device_handler_update_lang(config->lang);
1227         device_handler_reinit(handler);
1228 }
1229
1230 static char *device_from_addr(void *ctx, struct pb_url *url)
1231 {
1232         char *ipaddr, *buf, *tok, *dev = NULL;
1233         const char *delim = " ";
1234         struct sockaddr_in *ip;
1235         struct sockaddr_in si;
1236         struct addrinfo *res;
1237         struct process *p;
1238         int rc;
1239
1240         /* Note: IPv4 only */
1241         rc = inet_pton(AF_INET, url->host, &(si.sin_addr));
1242         if (rc > 0) {
1243                 ipaddr = url->host;
1244         } else {
1245                 /* need to turn hostname into a valid IP */
1246                 rc = getaddrinfo(url->host, NULL, NULL, &res);
1247                 if (rc) {
1248                         pb_debug("%s: Invalid URL\n",__func__);
1249                         return NULL;
1250                 }
1251                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
1252                 ip = (struct sockaddr_in *) res->ai_addr;
1253                 inet_ntop(AF_INET, &(ip->sin_addr), ipaddr, INET_ADDRSTRLEN);
1254                 freeaddrinfo(res);
1255         }
1256
1257         const char *argv[] = {
1258                 pb_system_apps.ip,
1259                 "route", "show", "to", "match",
1260                 ipaddr,
1261                 NULL
1262         };
1263
1264         p = process_create(ctx);
1265
1266         p->path = pb_system_apps.ip;
1267         p->argv = argv;
1268         p->keep_stdout = true;
1269
1270         rc = process_run_sync(p);
1271
1272         if (rc || p->exit_status) {
1273                 /* ip has complained for some reason; most likely
1274                  * there is no route to the host - bail out */
1275                 pb_debug("%s: `ip` returns non-zero exit status\n", __func__);
1276                 pb_debug("ip buf: %s\n", p->stdout_buf);
1277                 process_release(p);
1278                 return NULL;
1279         }
1280
1281         buf = p->stdout_buf;
1282         /* If a route is found, ip-route output will be of the form
1283          * "... dev DEVNAME ... " */
1284         tok = strtok(buf, delim);
1285         while (tok) {
1286                 if (!strcmp(tok, "dev")) {
1287                         tok = strtok(NULL, delim);
1288                         dev = talloc_strdup(ctx, tok);
1289                         break;
1290                 }
1291                 tok = strtok(NULL, delim);
1292         }
1293
1294         process_release(p);
1295         if (dev)
1296                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
1297         return dev;
1298 }
1299
1300 static void process_url_cb(struct load_url_result *result, void *data)
1301 {
1302         struct device_handler *handler;
1303         struct discover_context *ctx;
1304         struct discover_device *dev;
1305         struct event *event = data;
1306         const char *mac;
1307
1308         if (result->status != LOAD_OK) {
1309                 pb_log("%s: Load failed for %s\n", __func__, result->url->full);
1310                 return;
1311         }
1312
1313         if (!event)
1314                 return;
1315
1316         handler = talloc_parent(event);
1317         if (!handler)
1318                 return;
1319
1320         event->device = device_from_addr(event, result->url);
1321         if (!event->device) {
1322                 pb_log("Downloaded a file but can't find its interface - pretending it was local\n");
1323                 event->device = talloc_asprintf(event, "local");
1324         }
1325
1326         mac = event_get_param(event, "mac");
1327         char *url = talloc_asprintf(event, "file://%s", result->local);
1328         event_set_param(event, "pxeconffile", url);
1329
1330         dev = discover_device_create(handler, mac, event->device);
1331         ctx = device_handler_discover_context_create(handler, dev);
1332         talloc_steal(ctx, event);
1333         ctx->event = event;
1334
1335         iterate_parsers(ctx);
1336
1337         device_handler_discover_context_commit(handler, ctx);
1338
1339         talloc_unlink(handler, ctx);
1340 }
1341
1342 void device_handler_process_url(struct device_handler *handler,
1343                 const char *url, const char *mac, const char *ip)
1344 {
1345         struct discover_context *ctx;
1346         struct discover_device *dev;
1347         bool allow_async = false;
1348         struct pb_url *pb_url;
1349         struct event *event;
1350
1351         event = talloc_zero(handler, struct event);
1352         event->type = EVENT_TYPE_USER;
1353         event->action = EVENT_ACTION_URL;
1354
1355         pb_url = pb_url_parse(event, url);
1356         if (!pb_url || (pb_url->scheme != pb_url_file && !pb_url->host)) {
1357                 device_handler_status_err(handler, _("Invalid config URL!"));
1358                 talloc_free(event);
1359                 return;
1360         }
1361
1362         if (url[strlen(url) - 1] == '/') {
1363                 event_set_param(event, "pxepathprefix", url);
1364                 event_set_param(event, "mac", mac);
1365                 event_set_param(event, "ip", ip);
1366                 event->device = device_from_addr(event, pb_url);
1367                 if (!event->device) {
1368                         device_handler_status_err(handler,
1369                                         _("Unable to route to host %s"),
1370                                         pb_url->host);
1371                         talloc_free(event);
1372                         return;
1373                 }
1374         } else {
1375                 event_set_param(event, "pxeconffile", url);
1376                 allow_async = true;
1377         }
1378
1379         if (pb_url->scheme == pb_url_file)
1380                 event->device = talloc_asprintf(event, "local");
1381         else if (allow_async) {
1382                 /* If file is remote load asynchronously before passing to
1383                  * parser. This allows us to wait for network to be available */
1384                 if (!load_url_async(handler, pb_url, process_url_cb, event,
1385                                         NULL, handler)) {
1386                         pb_log("Failed to load url %s\n", pb_url->full);
1387                         device_handler_status_err(handler, _("Failed to load URL!"));
1388                         talloc_free(event);
1389                 }
1390                 return;
1391         }
1392
1393         /* If path is local we can parse straight away */
1394
1395         dev = discover_device_create(handler, mac, event->device);
1396         if (pb_url->scheme == pb_url_file)
1397                 dev->device->type = DEVICE_TYPE_ANY;
1398         ctx = device_handler_discover_context_create(handler, dev);
1399         talloc_steal(ctx, event);
1400         ctx->event = event;
1401
1402         iterate_parsers(ctx);
1403
1404         device_handler_discover_context_commit(handler, ctx);
1405
1406         talloc_unlink(handler, ctx);
1407 }
1408
1409 #ifndef PETITBOOT_TEST
1410
1411 /**
1412  * context_commit - Commit a temporary discovery context to the handler,
1413  * and notify the clients about any new options / devices
1414  */
1415 void device_handler_discover_context_commit(struct device_handler *handler,
1416                 struct discover_context *ctx)
1417 {
1418         struct discover_device *dev = ctx->device;
1419         struct discover_boot_option *opt, *tmp;
1420
1421         if (!device_lookup_by_uuid(handler, dev->uuid))
1422                 device_handler_add_device(handler, dev);
1423
1424         /* move boot options from the context to the device */
1425         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
1426                 list_remove(&opt->list);
1427
1428                 /* All boot options need at least a kernel image */
1429                 if (!opt->boot_image || !opt->boot_image->url) {
1430                         pb_log("boot option %s is missing boot image, ignoring\n",
1431                                 opt->option->id);
1432                         talloc_free(opt);
1433                         continue;
1434                 }
1435
1436                 if (boot_option_resolve(opt, handler)) {
1437                         pb_log("boot option %s is resolved, "
1438                                         "sending to clients\n",
1439                                         opt->option->id);
1440                         list_add_tail(&dev->boot_options, &opt->list);
1441                         talloc_steal(dev, opt);
1442                         boot_option_finalise(handler, opt);
1443                         notify_boot_option(handler, opt);
1444                 } else {
1445                         if (!opt->source->resolve_resource) {
1446                                 pb_log("parser %s gave us an unresolved "
1447                                         "resource (%s), but no way to "
1448                                         "resolve it\n",
1449                                         opt->source->name, opt->option->id);
1450                                 talloc_free(opt);
1451                         } else {
1452                                 pb_log("boot option %s is unresolved, "
1453                                                 "adding to queue\n",
1454                                                 opt->option->id);
1455                                 list_add(&handler->unresolved_boot_options,
1456                                                 &opt->list);
1457                                 talloc_steal(handler, opt);
1458                         }
1459                 }
1460         }
1461 }
1462
1463 void device_handler_add_plugin_option(struct device_handler *handler,
1464                 struct plugin_option *opt)
1465 {
1466         struct plugin_option *tmp;
1467         unsigned int i;
1468
1469         for (i = 0; i < handler->n_plugins; i++) {
1470                 tmp = handler->plugins[i];
1471                 /* If both id and version match, ignore */
1472                 if (strncmp(opt->id, tmp->id, strlen(opt->id)) == 0 &&
1473                                 strncmp(opt->version, tmp->version,
1474                                         strlen(opt->version) == 0)) {
1475                         pb_log("discover: Plugin '%s' already exists, ignoring\n",
1476                                         opt->id);
1477                         return;
1478                 }
1479         }
1480
1481         handler->plugins = talloc_realloc(handler, handler->plugins,
1482                         struct plugin_option *, handler->n_plugins + 1);
1483         if (!handler->plugins) {
1484                 pb_log("Failed to allocate memory for new plugin\n");
1485                 handler->n_plugins = 0;
1486                 return;
1487         }
1488
1489         handler->plugins[handler->n_plugins++] = opt;
1490         discover_server_notify_plugin_option_add(handler->server, opt);
1491 }
1492
1493 static void device_handler_update_lang(const char *lang)
1494 {
1495         const char *cur_lang;
1496
1497         if (!lang)
1498                 return;
1499
1500         cur_lang = setlocale(LC_ALL, NULL);
1501         if (cur_lang && !strcmp(cur_lang, lang))
1502                 return;
1503
1504         setlocale(LC_ALL, lang);
1505 }
1506
1507 static int device_handler_init_sources(struct device_handler *handler)
1508 {
1509         /* init our device sources: udev, network and user events */
1510         handler->network = network_init(handler, handler->waitset,
1511                         handler->dry_run);
1512         if (!handler->network)
1513                 return -1;
1514
1515         handler->udev = udev_init(handler, handler->waitset);
1516         if (!handler->udev)
1517                 return -1;
1518
1519         handler->user_event = user_event_init(handler, handler->waitset);
1520         if (!handler->user_event)
1521                 return -1;
1522
1523         return 0;
1524 }
1525
1526 static void device_handler_reinit_sources(struct device_handler *handler)
1527 {
1528         /* if we haven't initialised sources previously (becuase we started in
1529          * safe mode), then init once here. */
1530         if (!(handler->udev || handler->network || handler->user_event)) {
1531                 device_handler_init_sources(handler);
1532                 return;
1533         }
1534
1535         system_info_reinit();
1536
1537         network_shutdown(handler->network);
1538         handler->network = network_init(handler, handler->waitset,
1539                         handler->dry_run);
1540
1541         udev_reinit(handler->udev);
1542 }
1543
1544 static inline const char *get_device_path(struct discover_device *dev)
1545 {
1546         return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
1547 }
1548
1549 static char *check_subvols(struct discover_device *dev)
1550 {
1551         const char *fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1552         struct stat sb;
1553         char *path;
1554         int rc;
1555
1556         if (strncmp(fstype, "btrfs", strlen("btrfs")))
1557                 return dev->mount_path;
1558
1559         /* On btrfs a device's root may be under a subvolume path */
1560         path = join_paths(dev, dev->mount_path, "@");
1561         rc = stat(path, &sb);
1562         if (!rc && S_ISDIR(sb.st_mode)) {
1563                 pb_debug("Using '%s' for btrfs root path\n", path);
1564                 return path;
1565         }
1566
1567         talloc_free(path);
1568         return dev->mount_path;
1569 }
1570
1571 static bool check_existing_mount(struct discover_device *dev)
1572 {
1573         struct stat devstat, mntstat;
1574         const char *device_path;
1575         struct mntent *mnt;
1576         FILE *fp;
1577         int rc;
1578
1579         device_path = get_device_path(dev);
1580
1581         rc = stat(device_path, &devstat);
1582         if (rc) {
1583                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1584                 return false;
1585         }
1586
1587         if (!S_ISBLK(devstat.st_mode)) {
1588                 pb_debug("%s: %s isn't a block device?\n", __func__,
1589                                 dev->device_path);
1590                 return false;
1591         }
1592
1593         fp = fopen("/proc/self/mounts", "r");
1594
1595         for (;;) {
1596                 mnt = getmntent(fp);
1597                 if (!mnt)
1598                         break;
1599
1600                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1601                         continue;
1602
1603                 rc = stat(mnt->mnt_fsname, &mntstat);
1604                 if (rc)
1605                         continue;
1606
1607                 if (!S_ISBLK(mntstat.st_mode))
1608                         continue;
1609
1610                 if (mntstat.st_rdev == devstat.st_rdev) {
1611                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1612                         dev->root_path = check_subvols(dev);
1613                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1614                         dev->mounted = true;
1615                         dev->unmount = false;
1616
1617                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1618                                         __func__, dev->device_path,
1619                                         dev->mounted_rw ? 'w' : 'o',
1620                                         mnt->mnt_dir);
1621                         break;
1622                 }
1623         }
1624
1625         fclose(fp);
1626
1627         return mnt != NULL;
1628 }
1629
1630 /*
1631  * Attempt to mount a filesystem safely, while handling certain filesytem-
1632  * specific options
1633  */
1634 static int try_mount(const char *device_path, const char *mount_path,
1635                              const char *fstype, unsigned long flags,
1636                              bool have_snapshot)
1637 {
1638         const char *fs, *safe_opts;
1639         int rc;
1640
1641         /* Mount ext3 as ext4 instead so 'norecovery' can be used */
1642         if (strncmp(fstype, "ext3", strlen("ext3")) == 0) {
1643                 pb_debug("Mounting ext3 filesystem as ext4\n");
1644                 fs = "ext4";
1645         } else
1646                 fs = fstype;
1647
1648         if (strncmp(fs, "xfs", strlen("xfs")) == 0 ||
1649             strncmp(fs, "ext4", strlen("ext4")) == 0)
1650                 safe_opts = "norecovery";
1651         else
1652                 safe_opts = NULL;
1653
1654         errno = 0;
1655         /* If no snapshot is available don't attempt recovery */
1656         if (!have_snapshot)
1657                 return mount(device_path, mount_path, fs, flags, safe_opts);
1658
1659         rc = mount(device_path, mount_path, fs, flags, NULL);
1660
1661         if (!rc)
1662                 return rc;
1663
1664         /* Mounting failed; some filesystems will fail to mount if a recovery
1665          * journal exists (eg. cross-endian XFS), so try again with norecovery
1666          * where that option is available.
1667          * If mounting read-write just return the error as norecovery is not a
1668          * valid option */
1669         if ((flags & MS_RDONLY) != MS_RDONLY || !safe_opts)
1670                 return rc;
1671
1672         errno = 0;
1673         return mount(device_path, mount_path, fs, flags, safe_opts);
1674 }
1675
1676 static int mount_device(struct discover_device *dev)
1677 {
1678         const char *fstype, *device_path;
1679         int rc;
1680
1681         if (!dev->device_path)
1682                 return -1;
1683
1684         if (dev->mounted)
1685                 return 0;
1686
1687         if (check_existing_mount(dev))
1688                 return 0;
1689
1690         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1691         if (!fstype)
1692                 return 0;
1693
1694         dev->mount_path = join_paths(dev, mount_base(),
1695                                         dev->device_path);
1696
1697         if (pb_mkdir_recursive(dev->mount_path)) {
1698                 pb_log("couldn't create mount directory %s: %s\n",
1699                                 dev->mount_path, strerror(errno));
1700                 goto err_free;
1701         }
1702
1703         device_path = get_device_path(dev);
1704
1705         pb_log("mounting device %s read-only\n", dev->device_path);
1706         rc = try_mount(device_path, dev->mount_path, fstype,
1707                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1708
1709         if (!rc) {
1710                 dev->mounted = true;
1711                 dev->mounted_rw = false;
1712                 dev->unmount = true;
1713                 dev->root_path = check_subvols(dev);
1714                 return 0;
1715         }
1716
1717         pb_log("couldn't mount device %s: mount failed: %s\n",
1718                         device_path, strerror(errno));
1719
1720         /* If mount fails clean up any snapshot */
1721         devmapper_destroy_snapshot(dev);
1722
1723         pb_rmdir_recursive(mount_base(), dev->mount_path);
1724 err_free:
1725         talloc_free(dev->mount_path);
1726         dev->mount_path = NULL;
1727         return -1;
1728 }
1729
1730 static int umount_device(struct discover_device *dev)
1731 {
1732         const char *device_path;
1733         int rc;
1734
1735         if (!dev->mounted || !dev->unmount)
1736                 return 0;
1737
1738         device_path = get_device_path(dev);
1739
1740         pb_log("unmounting device %s\n", device_path);
1741         rc = umount(dev->mount_path);
1742         if (rc)
1743                 return -1;
1744
1745         dev->mounted = false;
1746         devmapper_destroy_snapshot(dev);
1747
1748         pb_rmdir_recursive(mount_base(), dev->mount_path);
1749
1750         talloc_free(dev->mount_path);
1751         dev->mount_path = NULL;
1752         dev->root_path = NULL;
1753
1754         return 0;
1755 }
1756
1757 int device_request_write(struct discover_device *dev, bool *release)
1758 {
1759         const char *fstype, *device_path;
1760         const struct config *config;
1761         int rc;
1762
1763         *release = false;
1764
1765         config = config_get();
1766         if (!config->allow_writes)
1767                 return -1;
1768
1769         if (!dev->mounted)
1770                 return -1;
1771
1772         if (dev->mounted_rw)
1773                 return 0;
1774
1775         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1776
1777         device_path = get_device_path(dev);
1778
1779         pb_log("remounting device %s read-write\n", device_path);
1780
1781         rc = umount(dev->mount_path);
1782         if (rc) {
1783                 pb_log("Failed to unmount %s: %s\n",
1784                        dev->mount_path, strerror(errno));
1785                 return -1;
1786         }
1787
1788         rc = try_mount(device_path, dev->mount_path, fstype,
1789                        MS_SILENT, dev->ramdisk);
1790         if (rc)
1791                 goto mount_ro;
1792
1793         dev->mounted_rw = true;
1794         *release = true;
1795         return 0;
1796
1797 mount_ro:
1798         pb_log("Unable to remount device %s read-write: %s\n",
1799                device_path, strerror(errno));
1800         rc = try_mount(device_path, dev->mount_path, fstype,
1801                        MS_RDONLY | MS_SILENT, dev->ramdisk);
1802         if (rc)
1803                 pb_log("Unable to recover mount for %s: %s\n",
1804                        device_path, strerror(errno));
1805         return -1;
1806 }
1807
1808 void device_release_write(struct discover_device *dev, bool release)
1809 {
1810         const char *fstype, *device_path;
1811
1812         if (!release)
1813                 return;
1814
1815         device_path = get_device_path(dev);
1816
1817         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1818
1819         pb_log("remounting device %s read-only\n", device_path);
1820
1821         if (umount(dev->mount_path)) {
1822                 pb_log("Failed to unmount %s\n", dev->mount_path);
1823                 return;
1824         }
1825         dev->mounted_rw = dev->mounted = false;
1826
1827         if (dev->ramdisk) {
1828                 devmapper_merge_snapshot(dev);
1829                 /* device_path becomes stale after merge */
1830                 device_path = get_device_path(dev);
1831         }
1832
1833         if (try_mount(device_path, dev->mount_path, fstype,
1834                        MS_RDONLY | MS_SILENT, dev->ramdisk))
1835                 pb_log("Failed to remount %s read-only: %s\n",
1836                        device_path, strerror(errno));
1837         else
1838                 dev->mounted = true;
1839 }
1840
1841 void device_sync_snapshots(struct device_handler *handler, const char *device)
1842 {
1843         struct discover_device *dev = NULL;
1844         unsigned int i;
1845
1846         if (device) {
1847                 /* Find matching device and sync */
1848                 dev = device_lookup_by_name(handler, device);
1849                 if (!dev) {
1850                         pb_log("%s: device name '%s' unrecognised\n",
1851                                 __func__, device);
1852                         return;
1853                 }
1854                 if (dev->ramdisk)
1855                         device_release_write(dev, true);
1856                 else
1857                         pb_log("%s has no snapshot to merge, skipping\n",
1858                                 dev->device->id);
1859                 return;
1860         }
1861
1862         /* Otherwise sync all relevant devices */
1863         for (i = 0; i < handler->n_devices; i++) {
1864                 dev = handler->devices[i];
1865                 if (dev->device->type != DEVICE_TYPE_DISK &&
1866                         dev->device->type != DEVICE_TYPE_USB)
1867                         continue;
1868                 if (dev->ramdisk)
1869                         device_release_write(dev, true);
1870                 else
1871                         pb_log("%s has no snapshot to merge, skipping\n",
1872                                 dev->device->id);
1873         }
1874 }
1875
1876 #else
1877
1878 void device_handler_discover_context_commit(
1879                 struct device_handler *handler __attribute__((unused)),
1880                 struct discover_context *ctx __attribute__((unused)))
1881 {
1882         pb_log("%s stubbed out for test cases\n", __func__);
1883 }
1884
1885 static void device_handler_update_lang(const char *lang __attribute__((unused)))
1886 {
1887 }
1888
1889 static int device_handler_init_sources(
1890                 struct device_handler *handler __attribute__((unused)))
1891 {
1892         return 0;
1893 }
1894
1895 static void device_handler_reinit_sources(
1896                 struct device_handler *handler __attribute__((unused)))
1897 {
1898 }
1899
1900 static int umount_device(struct discover_device *dev __attribute__((unused)))
1901 {
1902         return 0;
1903 }
1904
1905 static int __attribute__((unused)) mount_device(
1906                 struct discover_device *dev __attribute__((unused)))
1907 {
1908         return 0;
1909 }
1910
1911 int device_request_write(struct discover_device *dev __attribute__((unused)),
1912                 bool *release)
1913 {
1914         *release = true;
1915         return 0;
1916 }
1917
1918 void device_release_write(struct discover_device *dev __attribute__((unused)),
1919         bool release __attribute__((unused)))
1920 {
1921 }
1922
1923 void device_sync_snapshots(
1924                 struct device_handler *handler __attribute__((unused)),
1925                 const char *device __attribute__((unused)))
1926 {
1927 }
1928
1929 #endif