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

   1 #include <assert.h>
   2 #include <inttypes.h>
   3 #include <stdlib.h>
   4 #include <stdbool.h>
   5 #include <unistd.h>
   6 #include <string.h>
   7 #include <errno.h>
   8 #include <mntent.h>
   9 #include <locale.h>
  10 #include <sys/stat.h>
  11 #include <sys/wait.h>
  12 #include <sys/mount.h>
  13
  14 #include <talloc/talloc.h>
  15 #include <list/list.h>
  16 #include <log/log.h>
  17 #include <types/types.h>
  18 #include <system/system.h>
  19 #include <process/process.h>
  20 #include <url/url.h>
  21 #include <i18n/i18n.h>
  22 #include <pb-config/pb-config.h>
  23
  24 #include <sys/sysmacros.h>
  25 #include <sys/types.h>
  26 #include <sys/socket.h>
  27 #include <netdb.h>
  28 #include <arpa/inet.h>
  29
  30 #include "device-handler.h"
  31 #include "discover-server.h"
  32 #include "devmapper.h"
  33 #include "user-event.h"
  34 #include "platform.h"
  35 #include "event.h"
  36 #include "parser.h"
  37 #include "resource.h"
  38 #include "paths.h"
  39 #include "sysinfo.h"
  40 #include "boot.h"
  41 #include "udev.h"
  42 #include "network.h"
  43 #include "ipmi.h"
  44
  45 enum default_priority {
  46         DEFAULT_PRIORITY_TEMP_USER      = 1,
  47         DEFAULT_PRIORITY_REMOTE         = 2,
  48         DEFAULT_PRIORITY_LOCAL_FIRST    = 3,
  49         DEFAULT_PRIORITY_LOCAL_LAST     = 0xfe,
  50         DEFAULT_PRIORITY_DISABLED       = 0xff,
  51 };
  52
  53 static int default_rescan_timeout = 5 * 60; /* seconds */
  54
  55 struct progress_info {
  56         unsigned int                    percentage;
  57         unsigned long                   size;           /* size in bytes */
  58
  59         const struct process_info       *procinfo;
  60         struct list_item        list;
  61 };
  62
  63 struct device_handler {
  64         struct discover_server  *server;
  65         int                     dry_run;
  66
  67         struct pb_udev          *udev;
  68         struct network          *network;
  69         struct user_event       *user_event;
  70
  71         struct discover_device  **devices;
  72         unsigned int            n_devices;
  73
  74         struct ramdisk_device   **ramdisks;
  75         unsigned int            n_ramdisks;
  76
  77         struct waitset          *waitset;
  78         struct waiter           *timeout_waiter;
  79         bool                    autoboot_enabled;
  80         unsigned int            sec_to_boot;
  81         struct autoboot_option  *temp_autoboot;
  82
  83         struct discover_boot_option *default_boot_option;
  84         int                     default_boot_option_priority;
  85
  86         struct list             unresolved_boot_options;
  87
  88         struct boot_task        *pending_boot;
  89         bool                    pending_boot_is_default;
  90
  91         struct list             progress;
  92         unsigned int            n_progress;
  93
  94         struct plugin_option    **plugins;
  95         unsigned int            n_plugins;
  96         bool                    plugin_installing;
  97 };
  98
  99 static int mount_device(struct discover_device *dev);
 100 static int umount_device(struct discover_device *dev);
 101
 102 static int device_handler_init_sources(struct device_handler *handler);
 103 static void device_handler_reinit_sources(struct device_handler *handler);
 104
 105 static void device_handler_update_lang(const char *lang);
 106
 107 void discover_context_add_boot_option(struct discover_context *ctx,
 108                 struct discover_boot_option *boot_option)
 109 {
 110         boot_option->source = ctx->parser;
 111         list_add_tail(&ctx->boot_options, &boot_option->list);
 112         talloc_steal(ctx, boot_option);
 113 }
 114
 115 /**
 116  * device_handler_get_device_count - Get the count of current handler devices.
 117  */
 118
 119 int device_handler_get_device_count(const struct device_handler *handler)
 120 {
 121         return handler->n_devices;
 122 }
 123
 124 /**
 125  * device_handler_get_device - Get a handler device by index.
 126  */
 127
 128 const struct discover_device *device_handler_get_device(
 129         const struct device_handler *handler, unsigned int index)
 130 {
 131         if (index >= handler->n_devices) {
 132                 assert(0 && "bad index");
 133                 return NULL;
 134         }
 135
 136         return handler->devices[index];
 137 }
 138
 139 /**
 140  * device_handler_get_plugin_count - Get the count of current handler plugins.
 141  */
 142 int device_handler_get_plugin_count(const struct device_handler *handler)
 143 {
 144         return handler->n_plugins;
 145 }
 146
 147 /**
 148  * discover_handler_get_plugin - Get a handler plugin by index.
 149  */
 150 const struct plugin_option *device_handler_get_plugin(
 151         const struct device_handler *handler, unsigned int index)
 152 {
 153         if (index >= handler->n_plugins) {
 154                 assert(0 && "bad index");
 155                 return NULL;
 156         }
 157
 158         return handler->plugins[index];
 159 }
 160
 161 struct network *device_handler_get_network(
 162                 const struct device_handler *handler)
 163 {
 164         return handler->network;
 165 }
 166
 167 struct discover_boot_option *discover_boot_option_create(
 168                 struct discover_context *ctx,
 169                 struct discover_device *device)
 170 {
 171         struct discover_boot_option *opt;
 172
 173         opt = talloc_zero(ctx, struct discover_boot_option);
 174         opt->option = talloc_zero(opt, struct boot_option);
 175         opt->device = device;
 176
 177         return opt;
 178 }
 179
 180 static int device_match_uuid(struct discover_device *dev, const char *uuid)
 181 {
 182         return dev->uuid && !strcmp(dev->uuid, uuid);
 183 }
 184
 185 static int device_match_label(struct discover_device *dev, const char *label)
 186 {
 187         return dev->label && !strcmp(dev->label, label);
 188 }
 189
 190 static int device_match_id(struct discover_device *dev, const char *id)
 191 {
 192         return !strcmp(dev->device->id, id);
 193 }
 194
 195 static int device_match_serial(struct discover_device *dev, const char *serial)
 196 {
 197         const char *val = discover_device_get_param(dev, "ID_SERIAL");
 198         return val && !strcmp(val, serial);
 199 }
 200
 201 static struct discover_device *device_lookup(
 202                 struct device_handler *device_handler,
 203                 int (match_fn)(struct discover_device *, const char *),
 204                 const char *str)
 205 {
 206         struct discover_device *dev;
 207         unsigned int i;
 208
 209         if (!str)
 210                 return NULL;
 211
 212         for (i = 0; i < device_handler->n_devices; i++) {
 213                 dev = device_handler->devices[i];
 214
 215                 if (match_fn(dev, str))
 216                         return dev;
 217         }
 218
 219         return NULL;
 220 }
 221
 222 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 223                 const char *name)
 224 {
 225         if (!strncmp(name, "/dev/", strlen("/dev/")))
 226                 name += strlen("/dev/");
 227
 228         return device_lookup_by_id(handler, name);
 229 }
 230
 231 struct discover_device *device_lookup_by_uuid(
 232                 struct device_handler *device_handler,
 233                 const char *uuid)
 234 {
 235         return device_lookup(device_handler, device_match_uuid, uuid);
 236 }
 237
 238 struct discover_device *device_lookup_by_label(
 239                 struct device_handler *device_handler,
 240                 const char *label)
 241 {
 242         return device_lookup(device_handler, device_match_label, label);
 243 }
 244
 245 struct discover_device *device_lookup_by_id(
 246                 struct device_handler *device_handler,
 247                 const char *id)
 248 {
 249         return device_lookup(device_handler, device_match_id, id);
 250 }
 251
 252 struct discover_device *device_lookup_by_serial(
 253                 struct device_handler *device_handler,
 254                 const char *serial)
 255 {
 256         return device_lookup(device_handler, device_match_serial, serial);
 257 }
 258
 259 void device_handler_destroy(struct device_handler *handler)
 260 {
 261         talloc_free(handler);
 262 }
 263
 264 static int destroy_device(void *arg)
 265 {
 266         struct discover_device *dev = arg;
 267
 268         umount_device(dev);
 269
 270         return 0;
 271 }
 272
 273 struct discover_device *discover_device_create(struct device_handler *handler,
 274                 const char *uuid, const char *id)
 275 {
 276         struct discover_device *dev;
 277
 278         if (uuid)
 279                 dev = device_lookup_by_uuid(handler, uuid);
 280         else
 281                 dev = device_lookup_by_id(handler, id);
 282
 283         if (dev)
 284                 return dev;
 285
 286         dev = talloc_zero(handler, struct discover_device);
 287         dev->device = talloc_zero(dev, struct device);
 288         dev->device->id = talloc_strdup(dev->device, id);
 289         dev->uuid = talloc_strdup(dev, uuid);
 290         list_init(&dev->params);
 291         list_init(&dev->boot_options);
 292
 293         talloc_set_destructor(dev, destroy_device);
 294
 295         return dev;
 296 }
 297
 298 struct discover_device_param {
 299         char                    *name;
 300         char                    *value;
 301         struct list_item        list;
 302 };
 303
 304 void discover_device_set_param(struct discover_device *device,
 305                 const char *name, const char *value)
 306 {
 307         struct discover_device_param *param;
 308         bool found = false;
 309
 310         list_for_each_entry(&device->params, param, list) {
 311                 if (!strcmp(param->name, name)) {
 312                         found = true;
 313                         break;
 314                 }
 315         }
 316
 317         if (!found) {
 318                 if (!value)
 319                         return;
 320                 param = talloc(device, struct discover_device_param);
 321                 param->name = talloc_strdup(param, name);
 322                 list_add(&device->params, &param->list);
 323         } else {
 324                 if (!value) {
 325                         list_remove(&param->list);
 326                         talloc_free(param);
 327                         return;
 328                 }
 329                 talloc_free(param->value);
 330         }
 331
 332         param->value = talloc_strdup(param, value);
 333 }
 334
 335 const char *discover_device_get_param(struct discover_device *device,
 336                 const char *name)
 337 {
 338         struct discover_device_param *param;
 339
 340         list_for_each_entry(&device->params, param, list) {
 341                 if (!strcmp(param->name, name))
 342                         return param->value;
 343         }
 344         return NULL;
 345 }
 346
 347 static void set_env_variables(const struct config *config)
 348 {
 349         if (config->http_proxy)
 350                 setenv("http_proxy", config->http_proxy, 1);
 351         else
 352                 unsetenv("http_proxy");
 353
 354         if (config->https_proxy)
 355                 setenv("https_proxy", config->https_proxy, 1);
 356         else
 357                 unsetenv("https_proxy");
 358
 359         /* Reduce noise in the log from LVM listing open file descriptors */
 360         setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
 361 }
 362
 363 struct device_handler *device_handler_init(struct discover_server *server,
 364                 struct waitset *waitset, int dry_run)
 365 {
 366         struct device_handler *handler;
 367         int rc;
 368
 369         handler = talloc_zero(NULL, struct device_handler);
 370         handler->server = server;
 371         handler->waitset = waitset;
 372         handler->dry_run = dry_run;
 373         handler->autoboot_enabled = config_autoboot_active(config_get());
 374
 375         list_init(&handler->unresolved_boot_options);
 376
 377         list_init(&handler->progress);
 378
 379         /* set up our mount point base */
 380         pb_mkdir_recursive(mount_base());
 381
 382         parser_init();
 383
 384         if (config_get()->safe_mode)
 385                 return handler;
 386
 387         set_env_variables(config_get());
 388
 389         rc = device_handler_init_sources(handler);
 390         if (rc) {
 391                 talloc_free(handler);
 392                 return NULL;
 393         }
 394
 395         return handler;
 396 }
 397
 398 void device_handler_reinit(struct device_handler *handler)
 399 {
 400         struct discover_boot_option *opt, *tmp;
 401         struct ramdisk_device *ramdisk;
 402         struct config *config;
 403         unsigned int i;
 404
 405         device_handler_cancel_default(handler);
 406         /* Cancel any pending non-default boot */
 407         if (handler->pending_boot) {
 408                 boot_cancel(handler->pending_boot);
 409                 handler->pending_boot = NULL;
 410                 handler->pending_boot_is_default = false;
 411         }
 412
 413         /* Cancel any remaining async jobs */
 414         process_stop_async_all();
 415         pending_network_jobs_cancel();
 416
 417         /* free unresolved boot options */
 418         list_for_each_entry_safe(&handler->unresolved_boot_options,
 419                         opt, tmp, list)
 420                 talloc_free(opt);
 421         list_init(&handler->unresolved_boot_options);
 422
 423         /* drop all devices */
 424         for (i = 0; i < handler->n_devices; i++) {
 425                 struct discover_device *device = handler->devices[i];
 426                 discover_server_notify_device_remove(handler->server,
 427                                 device->device);
 428                 ramdisk = device->ramdisk;
 429                 if (device->requery_waiter)
 430                         waiter_remove(device->requery_waiter);
 431                 talloc_free(device);
 432                 talloc_free(ramdisk);
 433         }
 434
 435         talloc_free(handler->devices);
 436         handler->devices = NULL;
 437         handler->n_devices = 0;
 438         talloc_free(handler->ramdisks);
 439         handler->ramdisks = NULL;
 440         handler->n_ramdisks = 0;
 441
 442         /* drop any known plugins */
 443         for (i = 0; i < handler->n_plugins; i++)
 444                 talloc_free(handler->plugins[i]);
 445         talloc_free(handler->plugins);
 446         handler->plugins = NULL;
 447         handler->n_plugins = 0;
 448
 449         discover_server_notify_plugins_remove(handler->server);
 450
 451         set_env_variables(config_get());
 452
 453         /* If the safe mode warning was active disable it now */
 454         if (config_get()->safe_mode) {
 455                 config = config_copy(handler, config_get());
 456                 config->safe_mode = false;
 457                 config_set(config);
 458                 discover_server_notify_config(handler->server, config);
 459         }
 460
 461         /* Force rediscovery on SCSI devices */
 462         process_run_simple(handler, pb_system_apps.scsi_rescan, NULL);
 463
 464         device_handler_reinit_sources(handler);
 465 }
 466
 467 void device_handler_remove(struct device_handler *handler,
 468                 struct discover_device *device)
 469 {
 470         struct discover_boot_option *opt, *tmp;
 471         unsigned int i;
 472
 473         if (device->requery_waiter)
 474                 waiter_remove(device->requery_waiter);
 475
 476         list_for_each_entry_safe(&device->boot_options, opt, tmp, list) {
 477                 if (opt == handler->default_boot_option) {
 478                         pb_log("Default option %s cancelled since device removed",
 479                                         opt->option->name);
 480                         device_handler_cancel_default(handler);
 481                         break;
 482                 }
 483         }
 484
 485         for (i = 0; i < handler->n_devices; i++)
 486                 if (handler->devices[i] == device)
 487                         break;
 488
 489         if (i == handler->n_devices) {
 490                 talloc_free(device);
 491                 return;
 492         }
 493
 494         /* Free any unresolved options, as they're currently allocated
 495          * against the handler */
 496         list_for_each_entry_safe(&handler->unresolved_boot_options,
 497                         opt, tmp, list) {
 498                 if (opt->device != device)
 499                         continue;
 500                 list_remove(&opt->list);
 501                 talloc_free(opt);
 502         }
 503
 504         /* if this is a network device, we have to unregister it from the
 505          * network code */
 506         if (device->device->type == DEVICE_TYPE_NETWORK)
 507                 network_unregister_device(handler->network, device);
 508
 509         handler->n_devices--;
 510         memmove(&handler->devices[i], &handler->devices[i + 1],
 511                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 512         handler->devices = talloc_realloc(handler, handler->devices,
 513                 struct discover_device *, handler->n_devices);
 514
 515         if (device->notified)
 516                 discover_server_notify_device_remove(handler->server,
 517                                                         device->device);
 518
 519         talloc_free(device);
 520 }
 521
 522 void device_handler_status(struct device_handler *handler,
 523                 struct status *status)
 524 {
 525         pb_debug("%s: %s\n", __func__, status->message);
 526         discover_server_notify_boot_status(handler->server, status);
 527 }
 528
 529 static void _device_handler_vstatus(struct device_handler *handler,
 530                 enum status_type type, const char *fmt, va_list ap)
 531 {
 532         struct status status;
 533
 534         status.type = type;
 535         status.message = talloc_vasprintf(handler, fmt, ap);
 536         status.backlog = false;
 537         status.boot_active = false;
 538
 539         device_handler_status(handler, &status);
 540
 541         talloc_free(status.message);
 542 }
 543
 544 static void _device_handler_vdevstatus(struct device_handler *handler,
 545                 struct discover_device *device, enum status_type type,
 546                 const char *fmt, va_list ap)
 547 {
 548         char *msg;
 549
 550         msg = talloc_asprintf(handler, "[%s] %s",
 551                         device ? device->device->id : "unknown", fmt);
 552         _device_handler_vstatus(handler, type, msg, ap);
 553         talloc_free(msg);
 554 }
 555
 556 void device_handler_status_dev_info(struct device_handler *handler,
 557                 struct discover_device *dev, const char *fmt, ...)
 558 {
 559         va_list ap;
 560
 561         va_start(ap, fmt);
 562         _device_handler_vdevstatus(handler, dev, STATUS_INFO, fmt, ap);
 563         va_end(ap);
 564 }
 565
 566 void device_handler_status_dev_err(struct device_handler *handler,
 567                 struct discover_device *dev, const char *fmt, ...)
 568 {
 569         va_list ap;
 570
 571         va_start(ap, fmt);
 572         _device_handler_vdevstatus(handler, dev, STATUS_ERROR, fmt, ap);
 573         va_end(ap);
 574 }
 575
 576 void device_handler_status_info(struct device_handler *handler,
 577                 const char *fmt, ...)
 578 {
 579         va_list ap;
 580
 581         va_start(ap, fmt);
 582         _device_handler_vstatus(handler, STATUS_INFO, fmt, ap);
 583         va_end(ap);
 584 }
 585
 586 void device_handler_status_err(struct device_handler *handler,
 587                 const char *fmt, ...)
 588 {
 589         va_list ap;
 590
 591         va_start(ap, fmt);
 592         _device_handler_vstatus(handler, STATUS_ERROR, fmt, ap);
 593         va_end(ap);
 594 }
 595
 596 void device_handler_status_download(struct device_handler *handler,
 597                 const struct process_info *procinfo,
 598                 unsigned int percentage, unsigned int size, char suffix)
 599 {
 600         struct progress_info *p, *progress = NULL;
 601         uint64_t current_converted, current = 0;
 602         const char *units = " kMGTP";
 603         unsigned long size_bytes;
 604         char *update = NULL;
 605         double total = 0;
 606         unsigned int i;
 607         int unit = 0;
 608
 609         list_for_each_entry(&handler->progress, p, list)
 610                 if (p->procinfo == procinfo)
 611                         progress = p;
 612
 613         if (!progress) {
 614                 pb_log("Registering new progress struct\n");
 615                 progress = talloc_zero(handler, struct progress_info);
 616                 if (!progress) {
 617                         pb_log("Failed to allocate room for progress struct\n");
 618                         return;
 619                 }
 620                 progress->procinfo = procinfo;
 621                 list_add(&handler->progress, &progress->list);
 622                 handler->n_progress++;
 623         }
 624
 625         size_bytes = size;
 626         for (i = 0; i < strlen(units); i++) {
 627                 if (units[i] == suffix)
 628                         break;
 629         }
 630
 631         if (i >= strlen(units)) {
 632             pb_log("Couldn't recognise suffix '%c'\n", suffix);
 633             size_bytes = 0;
 634         } else {
 635                 while (i--)
 636                         size_bytes <<= 10;
 637         }
 638
 639         progress->percentage = percentage;
 640         progress->size = size_bytes;
 641
 642         /*
 643          * Aggregate the info we have and update status. If a progress struct
 644          * has zero for both percentage and size we assume progress information
 645          * is unavailable and fall back to a generic progress message.
 646          */
 647         list_for_each_entry(&handler->progress, p, list) {
 648                 uint64_t c;
 649                 double t;
 650                 if (!p->percentage || !p->size) {
 651                         update = talloc_asprintf(handler,
 652                                         _("%u downloads in progress..."),
 653                                         handler->n_progress);
 654                         current = total = 0;
 655                         break;
 656                 }
 657
 658                 c = p->size;
 659                 t = (100 * c) / p->percentage;
 660
 661                 current += c;
 662                 total += t;
 663         }
 664
 665         if (total) {
 666                 current_converted = current;
 667                 while (current_converted >= 1000) {
 668                         current_converted >>= 10;
 669                         unit++;
 670                 }
 671                 update = talloc_asprintf(handler,
 672                                 _("%u %s downloading: %.0f%% - %" PRIu64 "%cB"),
 673                                 handler->n_progress,
 674                                 ngettext("item", "items", handler->n_progress),
 675                                 (current / total) * 100, current_converted,
 676                                 units[unit]);
 677         }
 678
 679         if (!update) {
 680                 pb_log_fn("failed to allocate new status\n");
 681         } else {
 682                 device_handler_status_info(handler, "%s\n", update);
 683                 talloc_free(update);
 684         }
 685 }
 686
 687 static void device_handler_plugin_scan_device(struct device_handler *handler,
 688                 struct discover_device *dev)
 689 {
 690         int rc;
 691
 692         pb_debug("Scanning %s for plugin files\n", dev->device->id);
 693
 694         rc = process_run_simple(handler, pb_system_apps.pb_plugin,
 695                                 "scan", dev->mount_path,
 696                                 NULL);
 697         if (rc)
 698                 pb_log("Error from pb-plugin scan %s\n",
 699                                 dev->mount_path);
 700 }
 701
 702 void device_handler_status_download_remove(struct device_handler *handler,
 703                 struct process_info *procinfo)
 704 {
 705         struct progress_info *p, *tmp;
 706
 707         list_for_each_entry_safe(&handler->progress, p, tmp, list)
 708                 if (p->procinfo == procinfo) {
 709                         list_remove(&p->list);
 710                         talloc_free(p);
 711                         handler->n_progress--;
 712                 }
 713 }
 714
 715 static void device_handler_boot_status_cb(void *arg, struct status *status)
 716 {
 717         struct device_handler *handler = arg;
 718
 719         /* boot had failed; update handler state to allow a new default if one
 720          * is found later
 721          */
 722         if (status->type == STATUS_ERROR) {
 723                 handler->pending_boot = NULL;
 724                 handler->default_boot_option = NULL;
 725         }
 726
 727         device_handler_status(handler, status);
 728 }
 729
 730 static void countdown_status(struct device_handler *handler,
 731                 struct discover_boot_option *opt, unsigned int sec)
 732 {
 733         struct status status;
 734
 735         status.type = STATUS_INFO;
 736         status.message = talloc_asprintf(handler,
 737                         _("Booting in %d sec: [%s] %s"), sec,
 738                         opt->device->device->id, opt->option->name);
 739         status.backlog = false;
 740
 741         device_handler_status(handler, &status);
 742
 743         talloc_free(status.message);
 744 }
 745
 746 static int default_timeout(void *arg)
 747 {
 748         struct device_handler *handler = arg;
 749         struct discover_boot_option *opt;
 750
 751         if (!handler->default_boot_option)
 752                 return 0;
 753
 754         if (handler->pending_boot)
 755                 return 0;
 756
 757         opt = handler->default_boot_option;
 758
 759         if (handler->sec_to_boot) {
 760                 countdown_status(handler, opt, handler->sec_to_boot);
 761                 handler->sec_to_boot--;
 762                 handler->timeout_waiter = waiter_register_timeout(
 763                                                 handler->waitset, 1000,
 764                                                 default_timeout, handler);
 765                 return 0;
 766         }
 767
 768         handler->timeout_waiter = NULL;
 769
 770         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 771
 772         platform_pre_boot();
 773
 774         handler->pending_boot = boot(handler, handler->default_boot_option,
 775                         NULL, handler->dry_run, device_handler_boot_status_cb,
 776                         handler);
 777         handler->pending_boot_is_default = true;
 778         return 0;
 779 }
 780
 781 struct {
 782         enum ipmi_bootdev       ipmi_type;
 783         enum device_type        device_type;
 784 } device_type_map[] = {
 785         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
 786         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
 787         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_USB },
 788         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
 789 };
 790
 791 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
 792                 enum device_type device_type)
 793 {
 794         unsigned int i;
 795
 796         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
 797                 if (device_type_map[i].device_type == device_type)
 798                         return device_type_map[i].ipmi_type == ipmi_type;
 799         }
 800
 801         return false;
 802 }
 803
 804 static bool autoboot_option_matches(struct autoboot_option *opt,
 805                 struct discover_device *dev)
 806 {
 807         if (opt->boot_type == BOOT_DEVICE_UUID)
 808                 if (!strcmp(opt->uuid, dev->uuid))
 809                         return true;
 810
 811         if (opt->boot_type == BOOT_DEVICE_TYPE)
 812                 if (opt->type == dev->device->type ||
 813                     opt->type == DEVICE_TYPE_ANY)
 814                         return true;
 815
 816         return false;
 817 }
 818
 819 static int autoboot_option_priority(const struct config *config,
 820                                 struct discover_boot_option *opt)
 821 {
 822         struct autoboot_option *auto_opt;
 823         unsigned int i;
 824
 825         for (i = 0; i < config->n_autoboot_opts; i++) {
 826                 auto_opt = &config->autoboot_opts[i];
 827                 if (autoboot_option_matches(auto_opt, opt->device))
 828                         return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 829         }
 830
 831         return -1;
 832 }
 833
 834 /*
 835  * We have different priorities to resolve conflicts between boot options that
 836  * report to be the default for their device. This function assigns a priority
 837  * for these options.
 838  */
 839 static enum default_priority default_option_priority(
 840                 struct device_handler *handler,
 841                 struct discover_boot_option *opt)
 842 {
 843         const struct config *config;
 844
 845         /* Temporary user-provided autoboot options have highest priority */
 846         if (handler->temp_autoboot) {
 847                 if (autoboot_option_matches(handler->temp_autoboot,
 848                                         opt->device))
 849                         return DEFAULT_PRIORITY_TEMP_USER;
 850
 851                 pb_debug("handler: disabled default priority due to "
 852                                 "temporary user override\n");
 853                 return DEFAULT_PRIORITY_DISABLED;
 854         }
 855
 856         config = config_get();
 857
 858         /* Next highest priority to IPMI-configured boot options. If we have an
 859          * IPMI bootdev configuration set, then we don't allow any other
 860          * defaults */
 861         if (config->ipmi_bootdev) {
 862                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
 863                                 opt->device->device->type);
 864                 if (ipmi_match)
 865                         return DEFAULT_PRIORITY_REMOTE;
 866
 867                 pb_debug("handler: disabled default priority due to "
 868                                 "non-matching IPMI type %x\n",
 869                                 config->ipmi_bootdev);
 870                 return DEFAULT_PRIORITY_DISABLED;
 871         }
 872
 873         /* Next, try to match the option against the user-defined autoboot
 874          * options, either by device UUID or type. */
 875         if (config->n_autoboot_opts) {
 876                 int boot_match = autoboot_option_priority(config, opt);
 877                 if (boot_match > 0)
 878                         return boot_match;
 879         } else {
 880                 /* If there is no specific boot order, boot any device */
 881                 return DEFAULT_PRIORITY_LOCAL_FIRST;
 882         }
 883
 884         /* If the option didn't match any entry in the array, it is disabled */
 885         pb_debug("handler: disabled default priority due to "
 886                         "non-matching UUID or type\n");
 887         return DEFAULT_PRIORITY_DISABLED;
 888 }
 889
 890 static void set_default(struct device_handler *handler,
 891                 struct discover_boot_option *opt)
 892 {
 893         enum default_priority cur_prio, new_prio;
 894
 895         if (!handler->autoboot_enabled)
 896                 return;
 897
 898         pb_debug("handler: new default option: %s\n", opt->option->id);
 899
 900         new_prio = default_option_priority(handler, opt);
 901
 902         /* Anything outside our range prevents a default boot */
 903         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
 904                 return;
 905
 906         pb_debug("handler: calculated priority %d\n", new_prio);
 907
 908         /* Resolve any conflicts: if we have a new default option, it only
 909          * replaces the current if it has a higher priority. */
 910         if (handler->default_boot_option) {
 911
 912                 cur_prio = handler->default_boot_option_priority;
 913
 914                 if (new_prio < cur_prio) {
 915                         pb_log("handler: new prio %d beats "
 916                                         "old prio %d for %s\n",
 917                                         new_prio, cur_prio,
 918                                         handler->default_boot_option
 919                                                 ->option->id);
 920                         handler->default_boot_option = opt;
 921                         handler->default_boot_option_priority = new_prio;
 922                         /* extend the timeout a little, so the user sees some
 923                          * indication of the change */
 924                         handler->sec_to_boot += 2;
 925                 }
 926
 927                 return;
 928         }
 929
 930         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 931         handler->default_boot_option = opt;
 932         handler->default_boot_option_priority = new_prio;
 933
 934         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
 935                opt->option->id, handler->sec_to_boot);
 936
 937         default_timeout(handler);
 938 }
 939
 940 static char *autoboot_option_desc(void *ctx, const struct autoboot_option *opt)
 941 {
 942         const char *type, *val;
 943
 944         if (opt->boot_type == BOOT_DEVICE_TYPE) {
 945                 type = _("device type");
 946                 val = device_type_display_name(opt->type);
 947         } else if (opt->boot_type == BOOT_DEVICE_UUID) {
 948                 type = _("device UUID");
 949                 val = opt->uuid;
 950         } else {
 951                 type = _("unknown specifier");
 952                 val = NULL;
 953         }
 954
 955         return talloc_asprintf(ctx, "%s = %s", type, val);
 956 }
 957
 958 void device_handler_apply_temp_autoboot(struct device_handler *handler,
 959                 struct autoboot_option *opt)
 960 {
 961         unsigned int i;
 962         char *desc;
 963
 964         handler->temp_autoboot = talloc_steal(handler, opt);
 965
 966         desc = autoboot_option_desc(handler, opt);
 967         device_handler_status_info(handler,
 968                         _("Applying temporary autoboot override: %s"),
 969                         desc);
 970         talloc_free(desc);
 971
 972         if (!handler->autoboot_enabled)
 973                 return;
 974
 975         if (!handler->default_boot_option)
 976                 return;
 977
 978         if (autoboot_option_matches(opt, handler->default_boot_option->device))
 979                 return;
 980
 981         /* cancel the default, and rescan available options */
 982         device_handler_cancel_default(handler);
 983
 984         handler->autoboot_enabled = true;
 985
 986         for (i = 0; i < handler->n_devices; i++) {
 987                 struct discover_device *dev = handler->devices[i];
 988                 struct discover_boot_option *boot_opt;
 989
 990                 if (!autoboot_option_matches(opt, dev))
 991                         continue;
 992
 993                 list_for_each_entry(&dev->boot_options, boot_opt, list) {
 994                         if (boot_opt->option->is_default) {
 995                                 set_default(handler, boot_opt);
 996                                 break;
 997                         }
 998                 }
 999         }
1000 }
1001
1002 static bool resource_is_resolved(struct resource *res)
1003 {
1004         return !res || res->resolved;
1005 }
1006
1007 /* We only use this in an assert, which will disappear if we're compiling
1008  * with NDEBUG, so we need the 'used' attribute for these builds */
1009 static bool __attribute__((used)) boot_option_is_resolved(
1010                 struct discover_boot_option *opt)
1011 {
1012         return resource_is_resolved(opt->boot_image) &&
1013                 resource_is_resolved(opt->initrd) &&
1014                 resource_is_resolved(opt->dtb) &&
1015                 resource_is_resolved(opt->args_sig_file) &&
1016                 resource_is_resolved(opt->icon);
1017 }
1018
1019 static bool resource_resolve(struct resource *res, const char *name,
1020                 struct discover_boot_option *opt,
1021                 struct device_handler *handler)
1022 {
1023         struct parser *parser = opt->source;
1024
1025         if (resource_is_resolved(res))
1026                 return true;
1027
1028         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
1029                         opt->option->id, name, parser->name);
1030         parser->resolve_resource(handler, res);
1031
1032         return res->resolved;
1033 }
1034
1035 static bool boot_option_resolve(struct discover_boot_option *opt,
1036                 struct device_handler *handler)
1037 {
1038         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
1039                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
1040                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
1041                 resource_resolve(opt->args_sig_file, "args_sig_file", opt,
1042                         handler) &&
1043                 resource_resolve(opt->icon, "icon", opt, handler);
1044 }
1045
1046 static void boot_option_finalise(struct device_handler *handler,
1047                 struct discover_boot_option *opt)
1048 {
1049         assert(boot_option_is_resolved(opt));
1050
1051         /* check that the parsers haven't set any of the final data */
1052         assert(!opt->option->boot_image_file);
1053         assert(!opt->option->initrd_file);
1054         assert(!opt->option->dtb_file);
1055         assert(!opt->option->icon_file);
1056         assert(!opt->option->device_id);
1057         assert(!opt->option->args_sig_file);
1058
1059         if (opt->boot_image)
1060                 opt->option->boot_image_file = opt->boot_image->url->full;
1061         if (opt->initrd)
1062                 opt->option->initrd_file = opt->initrd->url->full;
1063         if (opt->dtb)
1064                 opt->option->dtb_file = opt->dtb->url->full;
1065         if (opt->icon)
1066                 opt->option->icon_file = opt->icon->url->full;
1067         if (opt->args_sig_file)
1068                 opt->option->args_sig_file = opt->args_sig_file->url->full;
1069
1070         opt->option->device_id = opt->device->device->id;
1071
1072         if (opt->option->is_default)
1073                 set_default(handler, opt);
1074 }
1075
1076 static void notify_boot_option(struct device_handler *handler,
1077                 struct discover_boot_option *opt)
1078 {
1079         struct discover_device *dev = opt->device;
1080
1081         if (!dev->notified)
1082                 discover_server_notify_device_add(handler->server,
1083                                                   opt->device->device);
1084         dev->notified = true;
1085         discover_server_notify_boot_option_add(handler->server, opt->option);
1086 }
1087
1088 static void process_boot_option_queue(struct device_handler *handler)
1089 {
1090         struct discover_boot_option *opt, *tmp;
1091
1092         list_for_each_entry_safe(&handler->unresolved_boot_options,
1093                         opt, tmp, list) {
1094
1095                 pb_debug("queue: attempting resolution for %s\n",
1096                                 opt->option->id);
1097
1098                 if (!boot_option_resolve(opt, handler))
1099                         continue;
1100
1101                 pb_debug("\tresolved!\n");
1102
1103                 list_remove(&opt->list);
1104                 list_add_tail(&opt->device->boot_options, &opt->list);
1105                 talloc_steal(opt->device, opt);
1106                 boot_option_finalise(handler, opt);
1107                 notify_boot_option(handler, opt);
1108         }
1109 }
1110
1111 struct discover_context *device_handler_discover_context_create(
1112                 struct device_handler *handler,
1113                 struct discover_device *device)
1114 {
1115         struct discover_context *ctx;
1116
1117         ctx = talloc_zero(handler, struct discover_context);
1118         ctx->handler = handler;
1119         ctx->device = device;
1120         list_init(&ctx->boot_options);
1121
1122         return ctx;
1123 }
1124
1125 void device_handler_add_device(struct device_handler *handler,
1126                 struct discover_device *device)
1127 {
1128         handler->n_devices++;
1129         handler->devices = talloc_realloc(handler, handler->devices,
1130                                 struct discover_device *, handler->n_devices);
1131         handler->devices[handler->n_devices - 1] = device;
1132
1133         if (device->device->type == DEVICE_TYPE_NETWORK)
1134                 network_register_device(handler->network, device);
1135 }
1136
1137 void device_handler_add_ramdisk(struct device_handler *handler,
1138                 const char *path)
1139 {
1140         struct ramdisk_device *dev;
1141         unsigned int i;
1142
1143         if (!path)
1144                 return;
1145
1146         for (i = 0; i < handler->n_ramdisks; i++)
1147                 if (!strcmp(handler->ramdisks[i]->path, path))
1148                         return;
1149
1150         dev = talloc_zero(handler, struct ramdisk_device);
1151         if (!dev) {
1152                 pb_log("Failed to allocate memory to track %s\n", path);
1153                 return;
1154         }
1155
1156         dev->path = talloc_strdup(handler, path);
1157
1158         handler->ramdisks = talloc_realloc(handler, handler->ramdisks,
1159                                 struct ramdisk_device *,
1160                                 handler->n_ramdisks + 1);
1161         if (!handler->ramdisks) {
1162                 pb_log("Failed to reallocate memory"
1163                        "- ramdisk tracking inconsistent!\n");
1164                 return;
1165         }
1166
1167         handler->ramdisks[i] = dev;
1168         i = handler->n_ramdisks++;
1169 }
1170
1171 struct ramdisk_device *device_handler_get_ramdisk(
1172                 struct device_handler *handler)
1173 {
1174         unsigned int i;
1175         char *name;
1176         dev_t id;
1177
1178         /* Check if free ramdisk exists */
1179         for (i = 0; i < handler->n_ramdisks; i++)
1180                 if (!handler->ramdisks[i]->snapshot &&
1181                     !handler->ramdisks[i]->origin &&
1182                     !handler->ramdisks[i]->base)
1183                         return handler->ramdisks[i];
1184
1185         /* Otherwise create a new one */
1186         name = talloc_asprintf(handler, "/dev/ram%d",
1187                         handler->n_ramdisks);
1188         if (!name) {
1189                 pb_debug("Failed to allocate memory to name /dev/ram%d",
1190                         handler->n_ramdisks);
1191                 return NULL;
1192         }
1193
1194         id = makedev(1, handler->n_ramdisks);
1195         if (mknod(name, S_IFBLK, id)) {
1196                 if (errno == EEXIST) {
1197                         /* We haven't yet received updates for existing
1198                          * ramdisks - add and use this one */
1199                         pb_debug("Using untracked ramdisk %s\n", name);
1200                 } else {
1201                         pb_log("Failed to create new ramdisk %s: %s\n",
1202                                name, strerror(errno));
1203                         return NULL;
1204                 }
1205         }
1206         device_handler_add_ramdisk(handler, name);
1207         talloc_free(name);
1208
1209         return handler->ramdisks[i];
1210 }
1211
1212 void device_handler_release_ramdisk(struct discover_device *device)
1213 {
1214         struct ramdisk_device *ramdisk = device->ramdisk;
1215
1216         talloc_free(ramdisk->snapshot);
1217         talloc_free(ramdisk->origin);
1218         talloc_free(ramdisk->base);
1219
1220         ramdisk->snapshot = ramdisk->origin = ramdisk->base = NULL;
1221         ramdisk->sectors = 0;
1222
1223         device->ramdisk = NULL;
1224 }
1225
1226 /* Start discovery on a hotplugged device. The device will be in our devices
1227  * array, but has only just been initialised by the hotplug source.
1228  */
1229 int device_handler_discover(struct device_handler *handler,
1230                 struct discover_device *dev)
1231 {
1232         struct discover_context *ctx;
1233         int rc;
1234
1235         device_handler_status_dev_info(handler, dev,
1236                 /*
1237                  * TRANSLATORS: this string will be passed the type of the
1238                  * device (eg "disk" or "network"), which will be translated
1239                  * accordingly.
1240                  */
1241                 _("Processing new %s device"),
1242                 device_type_display_name(dev->device->type));
1243
1244         /* create our context */
1245         ctx = device_handler_discover_context_create(handler, dev);
1246
1247         rc = mount_device(dev);
1248         if (rc)
1249                 goto out;
1250
1251         /* add this device to our system info */
1252         system_info_register_blockdev(dev->device->id, dev->uuid,
1253                         dev->mount_path);
1254
1255         /* run the parsers. This will populate the ctx's boot_option list. */
1256         iterate_parsers(ctx);
1257
1258         /* add discovered stuff to the handler */
1259         device_handler_discover_context_commit(handler, ctx);
1260
1261         process_boot_option_queue(handler);
1262
1263         /* Check this device for pb-plugins */
1264         device_handler_plugin_scan_device(handler, dev);
1265 out:
1266         talloc_unlink(handler, ctx);
1267
1268         return 0;
1269 }
1270
1271 struct requery_data {
1272         struct device_handler   *handler;
1273         struct discover_device  *device;
1274 };
1275
1276 static int device_handler_requery_timeout_fn(void *data)
1277 {
1278         struct discover_boot_option *opt, *tmp;
1279         struct requery_data *rqd = data;
1280         struct device_handler *handler;
1281         struct discover_device *device;
1282         bool autoboot;
1283
1284         handler = rqd->handler;
1285         device = rqd->device;
1286
1287         talloc_free(rqd);
1288
1289         /* network_requery_device may re-add a timeout, so clear the device
1290          * waiter here, so we can potentially start a new one. */
1291         device->requery_waiter = NULL;
1292
1293         /* We keep the device around, but get rid of the parsed boot
1294          * options on that device. That involves delaring out the lists,
1295          * and potentially cancelling a default.
1296          */
1297         list_for_each_entry_safe(&handler->unresolved_boot_options,
1298                         opt, tmp, list) {
1299                 if (opt->device != device)
1300                         continue;
1301                 list_remove(&opt->list);
1302                 talloc_free(opt);
1303         }
1304
1305         /* Track whether autoboot was enabled, if we cancel a default option
1306          * it will be switched off.
1307          */
1308         autoboot = handler->autoboot_enabled;
1309
1310         list_for_each_entry_safe(&device->boot_options, opt, tmp, list) {
1311                 if (opt == handler->default_boot_option) {
1312                         pb_log("Default option %s cancelled since device is being requeried\n",
1313                                         opt->option->name);
1314                         device_handler_cancel_default(handler);
1315                 }
1316                 list_remove(&opt->list);
1317                 talloc_free(opt);
1318         }
1319
1320         handler->autoboot_enabled = autoboot;
1321
1322         discover_server_notify_device_remove(handler->server, device->device);
1323         device->notified = false;
1324
1325         network_requery_device(handler->network, device);
1326
1327         return 0;
1328 }
1329
1330 /* Schedule a requery in timeout (seconds).
1331  *
1332  * Special values of timeout:
1333  *   0: no requery
1334  *  -1: use default
1335  */
1336 void device_handler_start_requery_timeout( struct device_handler *handler,
1337                 struct discover_device *dev, int timeout)
1338 {
1339         struct requery_data *rqd;
1340
1341         if (dev->requery_waiter)
1342                 return;
1343
1344         if (timeout == -1)
1345                 timeout = default_rescan_timeout;
1346         else if (timeout == 0)
1347                 return;
1348
1349         rqd = talloc(dev, struct requery_data);
1350         rqd->handler = handler;
1351         rqd->device = dev;
1352
1353         pb_debug("starting requery timeout for device %s, in %d sec\n",
1354                         dev->device->id, timeout);
1355
1356         dev->requery_waiter = waiter_register_timeout(handler->waitset,
1357                         timeout * 1000, device_handler_requery_timeout_fn, rqd);
1358 }
1359
1360 static int event_requery_timeout(struct event *event)
1361 {
1362         int timeout = -1;
1363         unsigned long x;
1364         const char *str;
1365         char *endp;
1366
1367         if (!event)
1368                 return timeout;
1369
1370         str = event_get_param(event, "reboottime");
1371         if (!str)
1372                 return timeout;
1373
1374         x = strtoul(str, &endp, 0);
1375         if (endp != str)
1376                 timeout = x;
1377
1378         return timeout;
1379 }
1380
1381
1382 /* Incoming dhcp event */
1383 int device_handler_dhcp(struct device_handler *handler,
1384                 struct discover_device *dev, struct event *event)
1385 {
1386         struct discover_context *ctx;
1387         const char *ip;
1388
1389         if (event_get_param(event, "ipv6"))
1390                 ip = event_get_param(event, "ipv6");
1391         else
1392                 ip = event_get_param(event, "ip");
1393
1394         device_handler_status_dev_info(handler, dev,
1395                         _("Processing DHCP lease response (ip: %s)"), ip);
1396
1397         pending_network_jobs_start();
1398
1399         /* create our context */
1400         ctx = device_handler_discover_context_create(handler, dev);
1401         talloc_steal(ctx, event);
1402         ctx->event = event;
1403
1404         device_handler_start_requery_timeout(handler, dev,
1405                         event_requery_timeout(event));
1406
1407         iterate_parsers(ctx);
1408
1409         device_handler_discover_context_commit(handler, ctx);
1410
1411         talloc_unlink(handler, ctx);
1412
1413         return 0;
1414 }
1415
1416 struct discover_boot_option *device_handler_find_option_by_name(
1417                 struct device_handler *handler, const char *device,
1418                 const char *name)
1419 {
1420         size_t len = strlen(name);
1421         unsigned int i;
1422
1423         for (i = 0; i < handler->n_devices; i++) {
1424                 struct discover_device *dev = handler->devices[i];
1425                 struct discover_boot_option *opt;
1426
1427                 list_for_each_entry(&dev->boot_options, opt, list)
1428                         /* Match exactly, partial matches can be quite common */
1429                         if (strlen(opt->option->name) == len &&
1430                                         !strcmp(opt->option->name, name))
1431                                 if (!dev || !strcmp(opt->option->device_id, device))
1432                                         return opt;
1433         }
1434
1435         return NULL;
1436 }
1437
1438 static struct discover_boot_option *find_boot_option_by_id(
1439                 struct device_handler *handler, const char *id)
1440 {
1441         unsigned int i;
1442
1443         for (i = 0; i < handler->n_devices; i++) {
1444                 struct discover_device *dev = handler->devices[i];
1445                 struct discover_boot_option *opt;
1446
1447                 list_for_each_entry(&dev->boot_options, opt, list)
1448                         if (!strcmp(opt->option->id, id))
1449                                 return opt;
1450         }
1451
1452         return NULL;
1453 }
1454
1455 void device_handler_boot(struct device_handler *handler,
1456                 struct boot_command *cmd)
1457 {
1458         struct discover_boot_option *opt = NULL;
1459
1460         if (cmd->option_id && strlen(cmd->option_id))
1461                 opt = find_boot_option_by_id(handler, cmd->option_id);
1462
1463         if (handler->pending_boot)
1464                 boot_cancel(handler->pending_boot);
1465
1466         platform_pre_boot();
1467
1468         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
1469                         device_handler_boot_status_cb, handler);
1470         handler->pending_boot_is_default = false;
1471 }
1472
1473 void device_handler_cancel_default(struct device_handler *handler)
1474 {
1475         if (handler->timeout_waiter)
1476                 waiter_remove(handler->timeout_waiter);
1477
1478         handler->timeout_waiter = NULL;
1479         handler->autoboot_enabled = false;
1480
1481         /* we only send status if we had a default boot option queued */
1482         if (!handler->default_boot_option)
1483                 return;
1484
1485         pb_log("Cancelling default boot option\n");
1486
1487         if (handler->pending_boot && handler->pending_boot_is_default) {
1488                 boot_cancel(handler->pending_boot);
1489                 handler->pending_boot = NULL;
1490                 handler->pending_boot_is_default = false;
1491         }
1492
1493         handler->default_boot_option = NULL;
1494
1495         device_handler_status_info(handler, _("Default boot cancelled"));
1496 }
1497
1498 void device_handler_update_config(struct device_handler *handler,
1499                 struct config *config)
1500 {
1501         int rc;
1502
1503         rc = config_set(config);
1504         if (rc)
1505                 return;
1506
1507         discover_server_notify_config(handler->server, config);
1508         device_handler_update_lang(config->lang);
1509         device_handler_reinit(handler);
1510 }
1511
1512 static char *device_from_addr(void *ctx, struct pb_url *url)
1513 {
1514         char *ipaddr, *buf, *tok, *dev = NULL;
1515         bool ipv6_route;
1516         const char *delim = " ";
1517         struct sockaddr_in *ipv4;
1518         struct sockaddr_in6 *ipv6;
1519         struct addrinfo *res;
1520         struct process *p;
1521         int rc;
1522
1523         /* Confirm url->host is either a valid hostname, or a
1524          * valid IPv4 or IPv6 address */
1525         rc = getaddrinfo(url->host, NULL, NULL, &res);
1526         if (rc) {
1527                 pb_debug("%s: Invalid URL\n",__func__);
1528                 return NULL;
1529         }
1530
1531         switch (res->ai_family) {
1532         case AF_INET:   /* ipv4 */
1533                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
1534                 ipv4 = (struct sockaddr_in *) res->ai_addr;
1535                 inet_ntop(AF_INET, &(ipv4->sin_addr), ipaddr, INET_ADDRSTRLEN);
1536                 ipv6_route = false;
1537                 break;
1538         case AF_INET6:  /* ipv6 */
1539                 ipaddr = talloc_array(ctx,char,INET6_ADDRSTRLEN);
1540                 ipv6 = (struct sockaddr_in6 *) res->ai_addr;
1541                 inet_ntop(AF_INET6, &(ipv6->sin6_addr), ipaddr, INET6_ADDRSTRLEN);
1542                 ipv6_route = true;
1543                 break;
1544         default:        /* error */
1545                 freeaddrinfo(res);
1546                 return NULL;
1547         }
1548         freeaddrinfo(res);
1549
1550         const char *argv[] = {
1551                 pb_system_apps.ip,
1552                 ipv6_route ? "-6" : "-4",
1553                 "route", "show", "to", "match",
1554                 ipaddr,
1555                 NULL
1556         };
1557
1558         p = process_create(ctx);
1559
1560         p->path = pb_system_apps.ip;
1561         p->argv = argv;
1562         p->keep_stdout = true;
1563
1564         rc = process_run_sync(p);
1565
1566         if (rc || p->exit_status) {
1567                 /* ip has complained for some reason; most likely
1568                  * there is no route to the host - bail out */
1569                 pb_debug("%s: `ip` returns non-zero exit status\n", __func__);
1570                 pb_debug("ip buf: %s\n", p->stdout_buf);
1571                 process_release(p);
1572                 return NULL;
1573         }
1574
1575         buf = p->stdout_buf;
1576         /* If a route is found, ip-route output will be of the form
1577          * "... dev DEVNAME ... " */
1578         tok = strtok(buf, delim);
1579         while (tok) {
1580                 if (!strcmp(tok, "dev")) {
1581                         tok = strtok(NULL, delim);
1582                         dev = talloc_strdup(ctx, tok);
1583                         break;
1584                 }
1585                 tok = strtok(NULL, delim);
1586         }
1587
1588         process_release(p);
1589         if (dev)
1590                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
1591         return dev;
1592 }
1593
1594 static void process_url_cb(struct load_url_result *result, void *data)
1595 {
1596         struct device_handler *handler;
1597         struct discover_context *ctx;
1598         struct discover_device *dev;
1599         struct event *event = data;
1600         const char *mac;
1601
1602         if (result->status != LOAD_OK) {
1603                 pb_log_fn("Load failed for %s\n", result->url->full);
1604                 return;
1605         }
1606
1607         if (!event)
1608                 return;
1609
1610         handler = talloc_parent(event);
1611         if (!handler)
1612                 return;
1613
1614         event->device = device_from_addr(event, result->url);
1615         if (!event->device) {
1616                 pb_log("Downloaded a file but can't find its interface - pretending it was local\n");
1617                 event->device = talloc_asprintf(event, "local");
1618         }
1619
1620         mac = event_get_param(event, "mac");
1621         char *url = talloc_asprintf(event, "file://%s", result->local);
1622         event_set_param(event, "pxeconffile-local", url);
1623
1624         dev = discover_device_create(handler, mac, event->device);
1625         ctx = device_handler_discover_context_create(handler, dev);
1626         talloc_steal(ctx, event);
1627         ctx->event = event;
1628
1629         iterate_parsers(ctx);
1630
1631         device_handler_discover_context_commit(handler, ctx);
1632
1633         talloc_unlink(handler, ctx);
1634 }
1635
1636 void device_handler_process_url(struct device_handler *handler,
1637                 const char *url, const char *mac, const char *ip)
1638 {
1639         struct discover_context *ctx;
1640         struct discover_device *dev;
1641         bool allow_async = false;
1642         struct pb_url *pb_url;
1643         struct event *event;
1644
1645         event = talloc_zero(handler, struct event);
1646         event->type = EVENT_TYPE_USER;
1647         event->action = EVENT_ACTION_URL;
1648
1649         pb_url = pb_url_parse(event, url);
1650         if (!pb_url || (pb_url->scheme != pb_url_file && !pb_url->host)) {
1651                 device_handler_status_err(handler, _("Invalid config URL!"));
1652                 talloc_free(event);
1653                 return;
1654         }
1655
1656         if (url[strlen(url) - 1] == '/') {
1657                 event_set_param(event, "pxepathprefix", url);
1658                 event_set_param(event, "mac", mac);
1659                 event_set_param(event, "ip", ip);
1660                 event->device = device_from_addr(event, pb_url);
1661                 if (!event->device) {
1662                         device_handler_status_err(handler,
1663                                         _("Unable to route to host %s"),
1664                                         pb_url->host);
1665                         talloc_free(event);
1666                         return;
1667                 }
1668         } else {
1669                 event_set_param(event, "pxeconffile", url);
1670                 allow_async = true;
1671         }
1672
1673         if (pb_url->scheme == pb_url_file)
1674                 event->device = talloc_asprintf(event, "local");
1675         else if (allow_async) {
1676                 /* If file is remote load asynchronously before passing to
1677                  * parser. This allows us to wait for network to be available */
1678                 if (!load_url_async(handler, pb_url, process_url_cb, event,
1679                                         NULL, handler)) {
1680                         pb_log("Failed to load url %s\n", pb_url->full);
1681                         device_handler_status_err(handler, _("Failed to load URL!"));
1682                         talloc_free(event);
1683                 }
1684                 return;
1685         }
1686
1687         /* If path is local we can parse straight away */
1688
1689         dev = discover_device_create(handler, mac, event->device);
1690         if (pb_url->scheme == pb_url_file)
1691                 dev->device->type = DEVICE_TYPE_ANY;
1692         ctx = device_handler_discover_context_create(handler, dev);
1693         talloc_steal(ctx, event);
1694         ctx->event = event;
1695
1696         iterate_parsers(ctx);
1697
1698         device_handler_discover_context_commit(handler, ctx);
1699
1700         talloc_unlink(handler, ctx);
1701 }
1702
1703 static void plugin_install_cb(struct process *process)
1704 {
1705         struct device_handler *handler = process->data;
1706
1707         if (!handler) {
1708                 pb_log_fn("Missing data!\n");
1709                 return;
1710         }
1711
1712         handler->plugin_installing = false;
1713         if (process->exit_status) {
1714                 device_handler_status_err(handler, "Plugin failed to install!");
1715                 pb_log("Failed to install plugin:\n%s\n", process->stdout_buf);
1716         }
1717 }
1718
1719 void device_handler_install_plugin(struct device_handler *handler,
1720                 const char *plugin_file)
1721 {
1722         struct process *p;
1723         int result;
1724
1725         if (handler->plugin_installing) {
1726                 pb_log("Plugin install cancelled - install already running");
1727                 return;
1728         }
1729
1730         p = process_create(handler);
1731         if (!p) {
1732                 pb_log("install_plugin: Failed to create process\n");
1733                 return;
1734         }
1735
1736         const char *argv[] = {
1737                 pb_system_apps.pb_plugin,
1738                 "install",
1739                 "auto",
1740                 plugin_file,
1741                 NULL
1742         };
1743
1744         p->path = pb_system_apps.pb_plugin;
1745         p->argv = argv;
1746         p->exit_cb = plugin_install_cb;
1747         p->data = handler;
1748         p->keep_stdout = true;
1749
1750         result = process_run_async(p);
1751
1752         if (result)
1753                 device_handler_status_err(handler, "Could not install plugin");
1754         else
1755                 handler->plugin_installing = true;
1756 }
1757
1758 #ifndef PETITBOOT_TEST
1759
1760 /**
1761  * context_commit - Commit a temporary discovery context to the handler,
1762  * and notify the clients about any new options / devices
1763  */
1764 void device_handler_discover_context_commit(struct device_handler *handler,
1765                 struct discover_context *ctx)
1766 {
1767         struct discover_device *dev = ctx->device;
1768         struct discover_boot_option *opt, *tmp;
1769
1770         if (!device_lookup_by_uuid(handler, dev->uuid))
1771                 device_handler_add_device(handler, dev);
1772
1773         /* move boot options from the context to the device */
1774         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
1775                 list_remove(&opt->list);
1776
1777                 /* All boot options need at least a kernel image */
1778                 if (!opt->boot_image || !opt->boot_image->url) {
1779                         pb_log("boot option %s is missing boot image, ignoring\n",
1780                                 opt->option->id);
1781                         talloc_free(opt);
1782                         continue;
1783                 }
1784
1785                 if (boot_option_resolve(opt, handler)) {
1786                         pb_log("boot option %s is resolved, "
1787                                         "sending to clients\n",
1788                                         opt->option->id);
1789                         list_add_tail(&dev->boot_options, &opt->list);
1790                         talloc_steal(dev, opt);
1791                         boot_option_finalise(handler, opt);
1792                         notify_boot_option(handler, opt);
1793                 } else {
1794                         if (!opt->source->resolve_resource) {
1795                                 pb_log("parser %s gave us an unresolved "
1796                                         "resource (%s), but no way to "
1797                                         "resolve it\n",
1798                                         opt->source->name, opt->option->id);
1799                                 talloc_free(opt);
1800                         } else {
1801                                 pb_log("boot option %s is unresolved, "
1802                                                 "adding to queue\n",
1803                                                 opt->option->id);
1804                                 list_add(&handler->unresolved_boot_options,
1805                                                 &opt->list);
1806                                 talloc_steal(handler, opt);
1807                         }
1808                 }
1809         }
1810 }
1811
1812 void device_handler_add_plugin_option(struct device_handler *handler,
1813                 struct plugin_option *opt)
1814 {
1815         struct plugin_option *tmp;
1816         unsigned int i;
1817
1818         for (i = 0; i < handler->n_plugins; i++) {
1819                 tmp = handler->plugins[i];
1820                 /* If both id and version match, ignore */
1821                 if (strncmp(opt->id, tmp->id, strlen(opt->id)) == 0 &&
1822                                 strcmp(opt->version, tmp->version) == 0) {
1823                         pb_log("discover: Plugin '%s' already exists, ignoring\n",
1824                                         opt->id);
1825                         return;
1826                 }
1827         }
1828
1829         handler->plugins = talloc_realloc(handler, handler->plugins,
1830                         struct plugin_option *, handler->n_plugins + 1);
1831         if (!handler->plugins) {
1832                 pb_log("Failed to allocate memory for new plugin\n");
1833                 handler->n_plugins = 0;
1834                 return;
1835         }
1836
1837         handler->plugins[handler->n_plugins++] = opt;
1838         discover_server_notify_plugin_option_add(handler->server, opt);
1839 }
1840
1841 static void device_handler_update_lang(const char *lang)
1842 {
1843         const char *cur_lang;
1844
1845         if (!lang)
1846                 return;
1847
1848         cur_lang = setlocale(LC_ALL, NULL);
1849         if (cur_lang && !strcmp(cur_lang, lang))
1850                 return;
1851
1852         setlocale(LC_ALL, lang);
1853 }
1854
1855 static int device_handler_init_sources(struct device_handler *handler)
1856 {
1857         /* init our device sources: udev, network and user events */
1858         handler->user_event = user_event_init(handler, handler->waitset);
1859         if (!handler->user_event)
1860                 return -1;
1861
1862         handler->network = network_init(handler, handler->waitset,
1863                         handler->dry_run);
1864         if (!handler->network)
1865                 return -1;
1866
1867         handler->udev = udev_init(handler, handler->waitset);
1868         if (!handler->udev)
1869                 return -1;
1870
1871         return 0;
1872 }
1873
1874 static void device_handler_reinit_sources(struct device_handler *handler)
1875 {
1876         /* if we haven't initialised sources previously (becuase we started in
1877          * safe mode), then init once here. */
1878         if (!(handler->udev || handler->network || handler->user_event)) {
1879                 device_handler_init_sources(handler);
1880                 return;
1881         }
1882
1883         system_info_reinit();
1884
1885         network_shutdown(handler->network);
1886         handler->network = network_init(handler, handler->waitset,
1887                         handler->dry_run);
1888
1889         udev_reinit(handler->udev);
1890 }
1891
1892 static inline const char *get_device_path(struct discover_device *dev)
1893 {
1894         return dev->ramdisk ? dev->ramdisk->snapshot : dev->device_path;
1895 }
1896
1897 static char *check_subvols(struct discover_device *dev)
1898 {
1899         const char *fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1900         struct stat sb;
1901         char *path;
1902         int rc;
1903
1904         if (strncmp(fstype, "btrfs", strlen("btrfs")))
1905                 return dev->mount_path;
1906
1907         /* On btrfs a device's root may be under a subvolume path */
1908         path = join_paths(dev, dev->mount_path, "@");
1909         rc = stat(path, &sb);
1910         if (!rc && S_ISDIR(sb.st_mode)) {
1911                 pb_debug("Using '%s' for btrfs root path\n", path);
1912                 return path;
1913         }
1914
1915         talloc_free(path);
1916         return dev->mount_path;
1917 }
1918
1919 static bool check_existing_mount(struct discover_device *dev)
1920 {
1921         struct stat devstat, mntstat;
1922         const char *device_path;
1923         struct mntent *mnt;
1924         FILE *fp;
1925         int rc;
1926
1927         device_path = get_device_path(dev);
1928
1929         rc = stat(device_path, &devstat);
1930         if (rc) {
1931                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1932                 return false;
1933         }
1934
1935         if (!S_ISBLK(devstat.st_mode)) {
1936                 pb_debug("%s: %s isn't a block device?\n", __func__,
1937                                 dev->device_path);
1938                 return false;
1939         }
1940
1941         fp = fopen("/proc/self/mounts", "r");
1942
1943         for (;;) {
1944                 mnt = getmntent(fp);
1945                 if (!mnt)
1946                         break;
1947
1948                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1949                         continue;
1950
1951                 rc = stat(mnt->mnt_fsname, &mntstat);
1952                 if (rc)
1953                         continue;
1954
1955                 if (!S_ISBLK(mntstat.st_mode))
1956                         continue;
1957
1958                 if (mntstat.st_rdev == devstat.st_rdev) {
1959                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1960                         dev->root_path = check_subvols(dev);
1961                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1962                         dev->mounted = true;
1963                         dev->unmount = false;
1964
1965                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1966                                         __func__, dev->device_path,
1967                                         dev->mounted_rw ? 'w' : 'o',
1968                                         mnt->mnt_dir);
1969                         break;
1970                 }
1971         }
1972
1973         fclose(fp);
1974
1975         return mnt != NULL;
1976 }
1977
1978 /*
1979  * Attempt to mount a filesystem safely, while handling certain filesytem-
1980  * specific options
1981  */
1982 static int try_mount(const char *device_path, const char *mount_path,
1983                              const char *fstype, unsigned long flags,
1984                              bool have_snapshot)
1985 {
1986         const char *fs, *safe_opts;
1987         int rc;
1988
1989         /* Mount ext3 as ext4 instead so 'norecovery' can be used */
1990         if (strncmp(fstype, "ext3", strlen("ext3")) == 0) {
1991                 pb_debug("Mounting ext3 filesystem as ext4\n");
1992                 fs = "ext4";
1993         } else
1994                 fs = fstype;
1995
1996         if (strncmp(fs, "xfs", strlen("xfs")) == 0 ||
1997             strncmp(fs, "ext4", strlen("ext4")) == 0)
1998                 safe_opts = "norecovery";
1999         else
2000                 safe_opts = NULL;
2001
2002         errno = 0;
2003         /* If no snapshot is available don't attempt recovery */
2004         if (!have_snapshot)
2005                 return mount(device_path, mount_path, fs, flags, safe_opts);
2006
2007         rc = mount(device_path, mount_path, fs, flags, NULL);
2008
2009         if (!rc)
2010                 return rc;
2011
2012         /* Mounting failed; some filesystems will fail to mount if a recovery
2013          * journal exists (eg. cross-endian XFS), so try again with norecovery
2014          * where that option is available.
2015          * If mounting read-write just return the error as norecovery is not a
2016          * valid option */
2017         if ((flags & MS_RDONLY) != MS_RDONLY || !safe_opts)
2018                 return rc;
2019
2020         errno = 0;
2021         return mount(device_path, mount_path, fs, flags, safe_opts);
2022 }
2023
2024 static int mount_device(struct discover_device *dev)
2025 {
2026         const char *fstype, *device_path;
2027         int rc;
2028
2029         if (!dev->device_path)
2030                 return -1;
2031
2032         if (dev->mounted)
2033                 return 0;
2034
2035         if (check_existing_mount(dev))
2036                 return 0;
2037
2038         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
2039         if (!fstype)
2040                 return 0;
2041
2042         dev->mount_path = join_paths(dev, mount_base(),
2043                                         dev->device_path);
2044
2045         if (pb_mkdir_recursive(dev->mount_path)) {
2046                 pb_log("couldn't create mount directory %s: %s\n",
2047                                 dev->mount_path, strerror(errno));
2048                 goto err_free;
2049         }
2050
2051         device_path = get_device_path(dev);
2052
2053         pb_log("mounting device %s read-only\n", dev->device_path);
2054         rc = try_mount(device_path, dev->mount_path, fstype,
2055                        MS_RDONLY | MS_SILENT, dev->ramdisk);
2056
2057         /* If mount fails clean up any snapshot and try again */
2058         if (rc && dev->ramdisk) {
2059                 pb_log("couldn't mount snapshot for %s: mount failed: %s\n",
2060                                 device_path, strerror(errno));
2061                 pb_log("falling back to actual device\n");
2062
2063                 devmapper_destroy_snapshot(dev);
2064
2065                 device_path = get_device_path(dev);
2066                 pb_log("mounting device %s read-only\n", dev->device_path);
2067                 rc = try_mount(device_path, dev->mount_path, fstype,
2068                                MS_RDONLY | MS_SILENT, dev->ramdisk);
2069         }
2070
2071         if (!rc) {
2072                 dev->mounted = true;
2073                 dev->mounted_rw = false;
2074                 dev->unmount = true;
2075                 dev->root_path = check_subvols(dev);
2076                 return 0;
2077         }
2078
2079         pb_log("couldn't mount device %s: mount failed: %s\n",
2080                         device_path, strerror(errno));
2081
2082         pb_rmdir_recursive(mount_base(), dev->mount_path);
2083 err_free:
2084         talloc_free(dev->mount_path);
2085         dev->mount_path = NULL;
2086         return -1;
2087 }
2088
2089 static int umount_device(struct discover_device *dev)
2090 {
2091         const char *device_path;
2092         int rc;
2093
2094         if (!dev->mounted || !dev->unmount)
2095                 return 0;
2096
2097         device_path = get_device_path(dev);
2098
2099         pb_log("unmounting device %s\n", device_path);
2100         rc = umount(dev->mount_path);
2101         if (rc)
2102                 return -1;
2103
2104         dev->mounted = false;
2105         devmapper_destroy_snapshot(dev);
2106
2107         pb_rmdir_recursive(mount_base(), dev->mount_path);
2108
2109         talloc_free(dev->mount_path);
2110         dev->mount_path = NULL;
2111         dev->root_path = NULL;
2112
2113         return 0;
2114 }
2115
2116 int device_request_write(struct discover_device *dev, bool *release)
2117 {
2118         const char *fstype, *device_path;
2119         const struct config *config;
2120         int rc;
2121
2122         *release = false;
2123
2124         config = config_get();
2125         if (!config->allow_writes)
2126                 return -1;
2127
2128         if (!dev->mounted)
2129                 return -1;
2130
2131         if (dev->mounted_rw)
2132                 return 0;
2133
2134         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
2135
2136         device_path = get_device_path(dev);
2137
2138         pb_log("remounting device %s read-write\n", device_path);
2139
2140         rc = umount(dev->mount_path);
2141         if (rc) {
2142                 pb_log("Failed to unmount %s: %s\n",
2143                        dev->mount_path, strerror(errno));
2144                 return -1;
2145         }
2146
2147         rc = try_mount(device_path, dev->mount_path, fstype,
2148                        MS_SILENT, dev->ramdisk);
2149         if (rc)
2150                 goto mount_ro;
2151
2152         dev->mounted_rw = true;
2153         *release = true;
2154         return 0;
2155
2156 mount_ro:
2157         pb_log("Unable to remount device %s read-write: %s\n",
2158                device_path, strerror(errno));
2159         rc = try_mount(device_path, dev->mount_path, fstype,
2160                        MS_RDONLY | MS_SILENT, dev->ramdisk);
2161         if (rc)
2162                 pb_log("Unable to recover mount for %s: %s\n",
2163                        device_path, strerror(errno));
2164         return -1;
2165 }
2166
2167 void device_release_write(struct discover_device *dev, bool release)
2168 {
2169         const char *fstype, *device_path;
2170
2171         if (!release)
2172                 return;
2173
2174         device_path = get_device_path(dev);
2175
2176         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
2177
2178         pb_log("remounting device %s read-only\n", device_path);
2179
2180         if (umount(dev->mount_path)) {
2181                 pb_log("Failed to unmount %s\n", dev->mount_path);
2182                 return;
2183         }
2184         dev->mounted_rw = dev->mounted = false;
2185
2186         if (dev->ramdisk) {
2187                 devmapper_merge_snapshot(dev);
2188                 /* device_path becomes stale after merge */
2189                 device_path = get_device_path(dev);
2190         }
2191
2192         if (try_mount(device_path, dev->mount_path, fstype,
2193                        MS_RDONLY | MS_SILENT, dev->ramdisk))
2194                 pb_log("Failed to remount %s read-only: %s\n",
2195                        device_path, strerror(errno));
2196         else
2197                 dev->mounted = true;
2198 }
2199
2200 void device_sync_snapshots(struct device_handler *handler, const char *device)
2201 {
2202         struct discover_device *dev = NULL;
2203         unsigned int i;
2204
2205         if (device) {
2206                 /* Find matching device and sync */
2207                 dev = device_lookup_by_name(handler, device);
2208                 if (!dev) {
2209                         pb_log("%s: device name '%s' unrecognised\n",
2210                                 __func__, device);
2211                         return;
2212                 }
2213                 if (dev->ramdisk)
2214                         device_release_write(dev, true);
2215                 else
2216                         pb_log("%s has no snapshot to merge, skipping\n",
2217                                 dev->device->id);
2218                 return;
2219         }
2220
2221         /* Otherwise sync all relevant devices */
2222         for (i = 0; i < handler->n_devices; i++) {
2223                 dev = handler->devices[i];
2224                 if (dev->device->type != DEVICE_TYPE_DISK &&
2225                         dev->device->type != DEVICE_TYPE_USB)
2226                         continue;
2227                 if (dev->ramdisk)
2228                         device_release_write(dev, true);
2229                 else
2230                         pb_log("%s has no snapshot to merge, skipping\n",
2231                                 dev->device->id);
2232         }
2233 }
2234
2235 #else
2236
2237 void device_handler_discover_context_commit(
2238                 struct device_handler *handler __attribute__((unused)),
2239                 struct discover_context *ctx __attribute__((unused)))
2240 {
2241         pb_log_fn("stubbed out for test cases\n");
2242 }
2243
2244 static void device_handler_update_lang(const char *lang __attribute__((unused)))
2245 {
2246 }
2247
2248 static int device_handler_init_sources(
2249                 struct device_handler *handler __attribute__((unused)))
2250 {
2251         return 0;
2252 }
2253
2254 static void device_handler_reinit_sources(
2255                 struct device_handler *handler __attribute__((unused)))
2256 {
2257 }
2258
2259 static int umount_device(struct discover_device *dev __attribute__((unused)))
2260 {
2261         return 0;
2262 }
2263
2264 static int __attribute__((unused)) mount_device(
2265                 struct discover_device *dev __attribute__((unused)))
2266 {
2267         return 0;
2268 }
2269
2270 int device_request_write(struct discover_device *dev __attribute__((unused)),
2271                 bool *release)
2272 {
2273         *release = true;
2274         return 0;
2275 }
2276
2277 void device_release_write(struct discover_device *dev __attribute__((unused)),
2278         bool release __attribute__((unused)))
2279 {
2280 }
2281
2282 void device_sync_snapshots(
2283                 struct device_handler *handler __attribute__((unused)),
2284                 const char *device __attribute__((unused)))
2285 {
2286 }
2287
2288 #endif