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