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

   1 #include <assert.h>
   2 #include <stdlib.h>
   3 #include <stdbool.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6 #include <errno.h>
   7 #include <mntent.h>
   8 #include <locale.h>
   9 #include <sys/stat.h>
  10 #include <sys/wait.h>
  11 #include <sys/mount.h>
  12
  13 #include <talloc/talloc.h>
  14 #include <list/list.h>
  15 #include <log/log.h>
  16 #include <types/types.h>
  17 #include <system/system.h>
  18 #include <process/process.h>
  19 #include <url/url.h>
  20 #include <i18n/i18n.h>
  21
  22 #include <sys/types.h>
  23 #include <sys/socket.h>
  24 #include <netdb.h>
  25 #include <arpa/inet.h>
  26
  27 #include "device-handler.h"
  28 #include "discover-server.h"
  29 #include "user-event.h"
  30 #include "platform.h"
  31 #include "event.h"
  32 #include "parser.h"
  33 #include "resource.h"
  34 #include "paths.h"
  35 #include "sysinfo.h"
  36 #include "boot.h"
  37 #include "udev.h"
  38 #include "network.h"
  39 #include "ipmi.h"
  40
  41 enum default_priority {
  42         DEFAULT_PRIORITY_REMOTE         = 1,
  43         DEFAULT_PRIORITY_LOCAL_FIRST    = 2,
  44         DEFAULT_PRIORITY_LOCAL_LAST     = 0xfe,
  45         DEFAULT_PRIORITY_DISABLED       = 0xff,
  46 };
  47
  48 struct device_handler {
  49         struct discover_server  *server;
  50         int                     dry_run;
  51
  52         struct pb_udev          *udev;
  53         struct network          *network;
  54         struct user_event       *user_event;
  55
  56         struct discover_device  **devices;
  57         unsigned int            n_devices;
  58
  59         struct waitset          *waitset;
  60         struct waiter           *timeout_waiter;
  61         bool                    autoboot_enabled;
  62         unsigned int            sec_to_boot;
  63
  64         struct discover_boot_option *default_boot_option;
  65         int                     default_boot_option_priority;
  66
  67         struct list             unresolved_boot_options;
  68
  69         struct boot_task        *pending_boot;
  70         bool                    pending_boot_is_default;
  71 };
  72
  73 static int mount_device(struct discover_device *dev);
  74 static int umount_device(struct discover_device *dev);
  75
  76 static int device_handler_init_sources(struct device_handler *handler);
  77 static void device_handler_reinit_sources(struct device_handler *handler);
  78
  79 static void device_handler_update_lang(const char *lang);
  80
  81 void discover_context_add_boot_option(struct discover_context *ctx,
  82                 struct discover_boot_option *boot_option)
  83 {
  84         boot_option->source = ctx->parser;
  85         list_add_tail(&ctx->boot_options, &boot_option->list);
  86         talloc_steal(ctx, boot_option);
  87 }
  88
  89 /**
  90  * device_handler_get_device_count - Get the count of current handler devices.
  91  */
  92
  93 int device_handler_get_device_count(const struct device_handler *handler)
  94 {
  95         return handler->n_devices;
  96 }
  97
  98 /**
  99  * device_handler_get_device - Get a handler device by index.
 100  */
 101
 102 const struct discover_device *device_handler_get_device(
 103         const struct device_handler *handler, unsigned int index)
 104 {
 105         if (index >= handler->n_devices) {
 106                 assert(0 && "bad index");
 107                 return NULL;
 108         }
 109
 110         return handler->devices[index];
 111 }
 112
 113 struct discover_boot_option *discover_boot_option_create(
 114                 struct discover_context *ctx,
 115                 struct discover_device *device)
 116 {
 117         struct discover_boot_option *opt;
 118
 119         opt = talloc_zero(ctx, struct discover_boot_option);
 120         opt->option = talloc_zero(opt, struct boot_option);
 121         opt->device = device;
 122
 123         return opt;
 124 }
 125
 126 static int device_match_uuid(struct discover_device *dev, const char *uuid)
 127 {
 128         return dev->uuid && !strcmp(dev->uuid, uuid);
 129 }
 130
 131 static int device_match_label(struct discover_device *dev, const char *label)
 132 {
 133         return dev->label && !strcmp(dev->label, label);
 134 }
 135
 136 static int device_match_id(struct discover_device *dev, const char *id)
 137 {
 138         return !strcmp(dev->device->id, id);
 139 }
 140
 141 static int device_match_serial(struct discover_device *dev, const char *serial)
 142 {
 143         const char *val = discover_device_get_param(dev, "ID_SERIAL");
 144         return val && !strcmp(val, serial);
 145 }
 146
 147 static struct discover_device *device_lookup(
 148                 struct device_handler *device_handler,
 149                 int (match_fn)(struct discover_device *, const char *),
 150                 const char *str)
 151 {
 152         struct discover_device *dev;
 153         unsigned int i;
 154
 155         if (!str)
 156                 return NULL;
 157
 158         for (i = 0; i < device_handler->n_devices; i++) {
 159                 dev = device_handler->devices[i];
 160
 161                 if (match_fn(dev, str))
 162                         return dev;
 163         }
 164
 165         return NULL;
 166 }
 167
 168 struct discover_device *device_lookup_by_name(struct device_handler *handler,
 169                 const char *name)
 170 {
 171         if (!strncmp(name, "/dev/", strlen("/dev/")))
 172                 name += strlen("/dev/");
 173
 174         return device_lookup_by_id(handler, name);
 175 }
 176
 177 struct discover_device *device_lookup_by_uuid(
 178                 struct device_handler *device_handler,
 179                 const char *uuid)
 180 {
 181         return device_lookup(device_handler, device_match_uuid, uuid);
 182 }
 183
 184 struct discover_device *device_lookup_by_label(
 185                 struct device_handler *device_handler,
 186                 const char *label)
 187 {
 188         return device_lookup(device_handler, device_match_label, label);
 189 }
 190
 191 struct discover_device *device_lookup_by_id(
 192                 struct device_handler *device_handler,
 193                 const char *id)
 194 {
 195         return device_lookup(device_handler, device_match_id, id);
 196 }
 197
 198 struct discover_device *device_lookup_by_serial(
 199                 struct device_handler *device_handler,
 200                 const char *serial)
 201 {
 202         return device_lookup(device_handler, device_match_serial, serial);
 203 }
 204
 205 void device_handler_destroy(struct device_handler *handler)
 206 {
 207         talloc_free(handler);
 208 }
 209
 210 static int destroy_device(void *arg)
 211 {
 212         struct discover_device *dev = arg;
 213
 214         umount_device(dev);
 215
 216         return 0;
 217 }
 218
 219 struct discover_device *discover_device_create(struct device_handler *handler,
 220                 const char *id)
 221 {
 222         struct discover_device *dev;
 223
 224         dev = device_lookup_by_id(handler, id);
 225         if (dev)
 226                 return dev;
 227
 228         dev = talloc_zero(handler, struct discover_device);
 229         dev->device = talloc_zero(dev, struct device);
 230         dev->device->id = talloc_strdup(dev->device, id);
 231         list_init(&dev->params);
 232         list_init(&dev->boot_options);
 233
 234         talloc_set_destructor(dev, destroy_device);
 235
 236         return dev;
 237 }
 238
 239 struct discover_device_param {
 240         char                    *name;
 241         char                    *value;
 242         struct list_item        list;
 243 };
 244
 245 void discover_device_set_param(struct discover_device *device,
 246                 const char *name, const char *value)
 247 {
 248         struct discover_device_param *param;
 249         bool found = false;
 250
 251         list_for_each_entry(&device->params, param, list) {
 252                 if (!strcmp(param->name, name)) {
 253                         found = true;
 254                         break;
 255                 }
 256         }
 257
 258         if (!found) {
 259                 if (!value)
 260                         return;
 261                 param = talloc(device, struct discover_device_param);
 262                 param->name = talloc_strdup(param, name);
 263                 list_add(&device->params, &param->list);
 264         } else {
 265                 if (!value) {
 266                         list_remove(&param->list);
 267                         talloc_free(param);
 268                         return;
 269                 }
 270                 talloc_free(param->value);
 271         }
 272
 273         param->value = talloc_strdup(param, value);
 274 }
 275
 276 const char *discover_device_get_param(struct discover_device *device,
 277                 const char *name)
 278 {
 279         struct discover_device_param *param;
 280
 281         list_for_each_entry(&device->params, param, list) {
 282                 if (!strcmp(param->name, name))
 283                         return param->value;
 284         }
 285         return NULL;
 286 }
 287
 288 struct device_handler *device_handler_init(struct discover_server *server,
 289                 struct waitset *waitset, int dry_run)
 290 {
 291         struct device_handler *handler;
 292         int rc;
 293
 294         handler = talloc_zero(NULL, struct device_handler);
 295         handler->server = server;
 296         handler->waitset = waitset;
 297         handler->dry_run = dry_run;
 298         handler->autoboot_enabled = config_get()->autoboot_enabled;
 299
 300         list_init(&handler->unresolved_boot_options);
 301
 302         /* set up our mount point base */
 303         pb_mkdir_recursive(mount_base());
 304
 305         parser_init();
 306
 307         if (config_get()->safe_mode)
 308                 return handler;
 309
 310         rc = device_handler_init_sources(handler);
 311         if (rc) {
 312                 talloc_free(handler);
 313                 return NULL;
 314         }
 315
 316         return handler;
 317 }
 318
 319 void device_handler_reinit(struct device_handler *handler)
 320 {
 321         struct discover_boot_option *opt, *tmp;
 322         unsigned int i;
 323
 324         device_handler_cancel_default(handler);
 325
 326         /* free unresolved boot options */
 327         list_for_each_entry_safe(&handler->unresolved_boot_options,
 328                         opt, tmp, list)
 329                 talloc_free(opt);
 330         list_init(&handler->unresolved_boot_options);
 331
 332         /* drop all devices */
 333         for (i = 0; i < handler->n_devices; i++)
 334                 discover_server_notify_device_remove(handler->server,
 335                                 handler->devices[i]->device);
 336
 337         talloc_free(handler->devices);
 338         handler->devices = NULL;
 339         handler->n_devices = 0;
 340
 341         device_handler_reinit_sources(handler);
 342 }
 343
 344 void device_handler_remove(struct device_handler *handler,
 345                 struct discover_device *device)
 346 {
 347         struct discover_boot_option *opt, *tmp;
 348         unsigned int i;
 349
 350         for (i = 0; i < handler->n_devices; i++)
 351                 if (handler->devices[i] == device)
 352                         break;
 353
 354         if (i == handler->n_devices) {
 355                 talloc_free(device);
 356                 return;
 357         }
 358
 359         /* Free any unresolved options, as they're currently allocated
 360          * against the handler */
 361         list_for_each_entry_safe(&handler->unresolved_boot_options,
 362                         opt, tmp, list) {
 363                 if (opt->device != device)
 364                         continue;
 365                 list_remove(&opt->list);
 366                 talloc_free(opt);
 367         }
 368
 369         /* if this is a network device, we have to unregister it from the
 370          * network code */
 371         if (device->device->type == DEVICE_TYPE_NETWORK)
 372                 network_unregister_device(handler->network, device);
 373
 374         handler->n_devices--;
 375         memmove(&handler->devices[i], &handler->devices[i + 1],
 376                 (handler->n_devices - i) * sizeof(handler->devices[0]));
 377         handler->devices = talloc_realloc(handler, handler->devices,
 378                 struct discover_device *, handler->n_devices);
 379
 380         if (device->notified)
 381                 discover_server_notify_device_remove(handler->server,
 382                                                         device->device);
 383
 384         talloc_free(device);
 385 }
 386
 387 static void boot_status(void *arg, struct boot_status *status)
 388 {
 389         struct device_handler *handler = arg;
 390
 391         discover_server_notify_boot_status(handler->server, status);
 392 }
 393
 394 static void countdown_status(struct device_handler *handler,
 395                 struct discover_boot_option *opt, unsigned int sec)
 396 {
 397         struct boot_status status;
 398
 399         status.type = BOOT_STATUS_INFO;
 400         status.progress = -1;
 401         status.detail = NULL;
 402         status.message = talloc_asprintf(handler,
 403                         _("Booting in %d sec: %s"), sec, opt->option->name);
 404
 405         discover_server_notify_boot_status(handler->server, &status);
 406
 407         talloc_free(status.message);
 408 }
 409
 410 static int default_timeout(void *arg)
 411 {
 412         struct device_handler *handler = arg;
 413         struct discover_boot_option *opt;
 414
 415         if (!handler->default_boot_option)
 416                 return 0;
 417
 418         if (handler->pending_boot)
 419                 return 0;
 420
 421         opt = handler->default_boot_option;
 422
 423         if (handler->sec_to_boot) {
 424                 countdown_status(handler, opt, handler->sec_to_boot);
 425                 handler->sec_to_boot--;
 426                 handler->timeout_waiter = waiter_register_timeout(
 427                                                 handler->waitset, 1000,
 428                                                 default_timeout, handler);
 429                 return 0;
 430         }
 431
 432         handler->timeout_waiter = NULL;
 433
 434         pb_log("Timeout expired, booting default option %s\n", opt->option->id);
 435
 436         handler->pending_boot = boot(handler, handler->default_boot_option,
 437                         NULL, handler->dry_run, boot_status, handler);
 438         handler->pending_boot_is_default = true;
 439         return 0;
 440 }
 441
 442 struct {
 443         enum ipmi_bootdev       ipmi_type;
 444         enum device_type        device_type;
 445 } device_type_map[] = {
 446         { IPMI_BOOTDEV_NETWORK, DEVICE_TYPE_NETWORK },
 447         { IPMI_BOOTDEV_DISK, DEVICE_TYPE_DISK },
 448         { IPMI_BOOTDEV_CDROM, DEVICE_TYPE_OPTICAL },
 449 };
 450
 451 static bool ipmi_device_type_matches(enum ipmi_bootdev ipmi_type,
 452                 enum device_type device_type)
 453 {
 454         unsigned int i;
 455
 456         for (i = 0; i < ARRAY_SIZE(device_type_map); i++) {
 457                 if (device_type_map[i].device_type == device_type)
 458                         return device_type_map[i].ipmi_type == ipmi_type;
 459         }
 460
 461         return false;
 462 }
 463
 464 static int autoboot_option_priority(const struct config *config,
 465                                 struct discover_boot_option *opt)
 466 {
 467         enum device_type type = opt->device->device->type;
 468         const char *uuid = opt->device->uuid;
 469         struct autoboot_option *auto_opt;
 470         unsigned int i;
 471
 472         for (i = 0; i < config->n_autoboot_opts; i++) {
 473                 auto_opt = &config->autoboot_opts[i];
 474                 if (auto_opt->boot_type == BOOT_DEVICE_UUID)
 475                         if (!strcmp(auto_opt->uuid, uuid))
 476                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 477
 478                 if (auto_opt->boot_type == BOOT_DEVICE_TYPE)
 479                         if (auto_opt->type == type ||
 480                             auto_opt->type == DEVICE_TYPE_ANY)
 481                                 return DEFAULT_PRIORITY_LOCAL_FIRST + i;
 482         }
 483
 484         return -1;
 485 }
 486
 487 /*
 488  * We have different priorities to resolve conflicts between boot options that
 489  * report to be the default for their device. This function assigns a priority
 490  * for these options.
 491  */
 492 static enum default_priority default_option_priority(
 493                 struct discover_boot_option *opt)
 494 {
 495         const struct config *config;
 496
 497         config = config_get();
 498
 499         /* We give highest priority to IPMI-configured boot options. If
 500          * we have an IPMI bootdev configuration set, then we don't allow
 501          * any other defaults */
 502         if (config->ipmi_bootdev) {
 503                 bool ipmi_match = ipmi_device_type_matches(config->ipmi_bootdev,
 504                                 opt->device->device->type);
 505                 if (ipmi_match)
 506                         return DEFAULT_PRIORITY_REMOTE;
 507
 508                 pb_debug("handler: disabled default priority due to "
 509                                 "non-matching IPMI type %x\n",
 510                                 config->ipmi_bootdev);
 511                 return DEFAULT_PRIORITY_DISABLED;
 512         }
 513
 514         /* Next, try to match the option against the user-defined autoboot
 515          * options, either by device UUID or type. */
 516         if (config->n_autoboot_opts) {
 517                 int boot_match = autoboot_option_priority(config, opt);
 518                 if (boot_match > 0)
 519                         return boot_match;
 520         }
 521
 522         /* If the option didn't match any entry in the array, it is disabled */
 523         pb_debug("handler: disabled default priority due to "
 524                         "non-matching UUID or type\n");
 525         return DEFAULT_PRIORITY_DISABLED;
 526 }
 527
 528 static void set_default(struct device_handler *handler,
 529                 struct discover_boot_option *opt)
 530 {
 531         enum default_priority cur_prio, new_prio;
 532
 533         if (!handler->autoboot_enabled)
 534                 return;
 535
 536         pb_debug("handler: new default option: %s\n", opt->option->id);
 537
 538         new_prio = default_option_priority(opt);
 539
 540         /* Anything outside our range prevents a default boot */
 541         if (new_prio >= DEFAULT_PRIORITY_DISABLED)
 542                 return;
 543
 544         pb_debug("handler: calculated priority %d\n", new_prio);
 545
 546         /* Resolve any conflicts: if we have a new default option, it only
 547          * replaces the current if it has a higher priority. */
 548         if (handler->default_boot_option) {
 549
 550                 cur_prio = handler->default_boot_option_priority;
 551
 552                 if (new_prio < cur_prio) {
 553                         pb_log("handler: new prio %d beats "
 554                                         "old prio %d for %s\n",
 555                                         new_prio, cur_prio,
 556                                         handler->default_boot_option
 557                                                 ->option->id);
 558                         handler->default_boot_option = opt;
 559                         handler->default_boot_option_priority = new_prio;
 560                         /* extend the timeout a little, so the user sees some
 561                          * indication of the change */
 562                         handler->sec_to_boot += 2;
 563                 }
 564
 565                 return;
 566         }
 567
 568         handler->sec_to_boot = config_get()->autoboot_timeout_sec;
 569         handler->default_boot_option = opt;
 570         handler->default_boot_option_priority = new_prio;
 571
 572         pb_log("handler: boot option %s set as default, timeout %u sec.\n",
 573                opt->option->id, handler->sec_to_boot);
 574
 575         default_timeout(handler);
 576 }
 577
 578 static bool resource_is_resolved(struct resource *res)
 579 {
 580         return !res || res->resolved;
 581 }
 582
 583 /* We only use this in an assert, which will disappear if we're compiling
 584  * with NDEBUG, so we need the 'used' attribute for these builds */
 585 static bool __attribute__((used)) boot_option_is_resolved(
 586                 struct discover_boot_option *opt)
 587 {
 588         return resource_is_resolved(opt->boot_image) &&
 589                 resource_is_resolved(opt->initrd) &&
 590                 resource_is_resolved(opt->dtb) &&
 591                 resource_is_resolved(opt->icon);
 592 }
 593
 594 static bool resource_resolve(struct resource *res, const char *name,
 595                 struct discover_boot_option *opt,
 596                 struct device_handler *handler)
 597 {
 598         struct parser *parser = opt->source;
 599
 600         if (resource_is_resolved(res))
 601                 return true;
 602
 603         pb_debug("Attempting to resolve resource %s->%s with parser %s\n",
 604                         opt->option->id, name, parser->name);
 605         parser->resolve_resource(handler, res);
 606
 607         return res->resolved;
 608 }
 609
 610 static bool boot_option_resolve(struct discover_boot_option *opt,
 611                 struct device_handler *handler)
 612 {
 613         return resource_resolve(opt->boot_image, "boot_image", opt, handler) &&
 614                 resource_resolve(opt->initrd, "initrd", opt, handler) &&
 615                 resource_resolve(opt->dtb, "dtb", opt, handler) &&
 616                 resource_resolve(opt->icon, "icon", opt, handler);
 617 }
 618
 619 static void boot_option_finalise(struct device_handler *handler,
 620                 struct discover_boot_option *opt)
 621 {
 622         assert(boot_option_is_resolved(opt));
 623
 624         /* check that the parsers haven't set any of the final data */
 625         assert(!opt->option->boot_image_file);
 626         assert(!opt->option->initrd_file);
 627         assert(!opt->option->dtb_file);
 628         assert(!opt->option->icon_file);
 629         assert(!opt->option->device_id);
 630
 631         if (opt->boot_image)
 632                 opt->option->boot_image_file = opt->boot_image->url->full;
 633         if (opt->initrd)
 634                 opt->option->initrd_file = opt->initrd->url->full;
 635         if (opt->dtb)
 636                 opt->option->dtb_file = opt->dtb->url->full;
 637         if (opt->icon)
 638                 opt->option->icon_file = opt->icon->url->full;
 639
 640         opt->option->device_id = opt->device->device->id;
 641
 642         if (opt->option->is_default)
 643                 set_default(handler, opt);
 644 }
 645
 646 static void notify_boot_option(struct device_handler *handler,
 647                 struct discover_boot_option *opt)
 648 {
 649         struct discover_device *dev = opt->device;
 650
 651         if (!dev->notified)
 652                 discover_server_notify_device_add(handler->server,
 653                                                   opt->device->device);
 654         dev->notified = true;
 655         discover_server_notify_boot_option_add(handler->server, opt->option);
 656 }
 657
 658 static void process_boot_option_queue(struct device_handler *handler)
 659 {
 660         struct discover_boot_option *opt, *tmp;
 661
 662         list_for_each_entry_safe(&handler->unresolved_boot_options,
 663                         opt, tmp, list) {
 664
 665                 pb_debug("queue: attempting resolution for %s\n",
 666                                 opt->option->id);
 667
 668                 if (!boot_option_resolve(opt, handler))
 669                         continue;
 670
 671                 pb_debug("\tresolved!\n");
 672
 673                 list_remove(&opt->list);
 674                 list_add_tail(&opt->device->boot_options, &opt->list);
 675                 talloc_steal(opt->device, opt);
 676                 boot_option_finalise(handler, opt);
 677                 notify_boot_option(handler, opt);
 678         }
 679 }
 680
 681 struct discover_context *device_handler_discover_context_create(
 682                 struct device_handler *handler,
 683                 struct discover_device *device)
 684 {
 685         struct discover_context *ctx;
 686
 687         ctx = talloc_zero(handler, struct discover_context);
 688         ctx->device = device;
 689         ctx->network = handler->network;
 690         list_init(&ctx->boot_options);
 691
 692         return ctx;
 693 }
 694
 695 /**
 696  * context_commit - Commit a temporary discovery context to the handler,
 697  * and notify the clients about any new options / devices
 698  */
 699 void device_handler_discover_context_commit(struct device_handler *handler,
 700                 struct discover_context *ctx)
 701 {
 702         struct discover_device *dev = ctx->device;
 703         struct discover_boot_option *opt, *tmp;
 704
 705         if (!device_lookup_by_id(handler, dev->device->id))
 706                 device_handler_add_device(handler, dev);
 707
 708         /* move boot options from the context to the device */
 709         list_for_each_entry_safe(&ctx->boot_options, opt, tmp, list) {
 710                 list_remove(&opt->list);
 711
 712                 if (boot_option_resolve(opt, handler)) {
 713                         pb_log("boot option %s is resolved, "
 714                                         "sending to clients\n",
 715                                         opt->option->id);
 716                         list_add_tail(&dev->boot_options, &opt->list);
 717                         talloc_steal(dev, opt);
 718                         boot_option_finalise(handler, opt);
 719                         notify_boot_option(handler, opt);
 720                 } else {
 721                         if (!opt->source->resolve_resource) {
 722                                 pb_log("parser %s gave us an unresolved "
 723                                         "resource (%s), but no way to "
 724                                         "resolve it\n",
 725                                         opt->source->name, opt->option->id);
 726                                 talloc_free(opt);
 727                         } else {
 728                                 pb_log("boot option %s is unresolved, "
 729                                                 "adding to queue\n",
 730                                                 opt->option->id);
 731                                 list_add(&handler->unresolved_boot_options,
 732                                                 &opt->list);
 733                                 talloc_steal(handler, opt);
 734                         }
 735                 }
 736         }
 737 }
 738
 739 void device_handler_add_device(struct device_handler *handler,
 740                 struct discover_device *device)
 741 {
 742         handler->n_devices++;
 743         handler->devices = talloc_realloc(handler, handler->devices,
 744                                 struct discover_device *, handler->n_devices);
 745         handler->devices[handler->n_devices - 1] = device;
 746
 747         if (device->device->type == DEVICE_TYPE_NETWORK)
 748                 network_register_device(handler->network, device);
 749 }
 750
 751 /* Start discovery on a hotplugged device. The device will be in our devices
 752  * array, but has only just been initialised by the hotplug source.
 753  */
 754 int device_handler_discover(struct device_handler *handler,
 755                 struct discover_device *dev)
 756 {
 757         struct discover_context *ctx;
 758         int rc;
 759
 760         process_boot_option_queue(handler);
 761
 762         /* create our context */
 763         ctx = device_handler_discover_context_create(handler, dev);
 764
 765         rc = mount_device(dev);
 766         if (rc)
 767                 goto out;
 768
 769         /* add this device to our system info */
 770         system_info_register_blockdev(dev->device->id, dev->uuid,
 771                         dev->mount_path);
 772
 773         /* run the parsers. This will populate the ctx's boot_option list. */
 774         iterate_parsers(ctx);
 775
 776         /* add discovered stuff to the handler */
 777         device_handler_discover_context_commit(handler, ctx);
 778
 779 out:
 780         talloc_free(ctx);
 781
 782         return 0;
 783 }
 784
 785 /* Incoming dhcp event */
 786 int device_handler_dhcp(struct device_handler *handler,
 787                 struct discover_device *dev, struct event *event)
 788 {
 789         struct discover_context *ctx;
 790
 791         /* create our context */
 792         ctx = device_handler_discover_context_create(handler, dev);
 793         ctx->event = event;
 794
 795         iterate_parsers(ctx);
 796
 797         device_handler_discover_context_commit(handler, ctx);
 798
 799         talloc_free(ctx);
 800
 801         return 0;
 802 }
 803
 804 /* incoming conf event */
 805 int device_handler_conf(struct device_handler *handler,
 806                 struct discover_device *dev, struct pb_url *url)
 807 {
 808         struct discover_context *ctx;
 809
 810         /* create our context */
 811         ctx = device_handler_discover_context_create(handler, dev);
 812         ctx->conf_url = url;
 813
 814         iterate_parsers(ctx);
 815
 816         device_handler_discover_context_commit(handler, ctx);
 817
 818         talloc_free(ctx);
 819
 820         return 0;
 821 }
 822
 823 static struct discover_boot_option *find_boot_option_by_id(
 824                 struct device_handler *handler, const char *id)
 825 {
 826         unsigned int i;
 827
 828         for (i = 0; i < handler->n_devices; i++) {
 829                 struct discover_device *dev = handler->devices[i];
 830                 struct discover_boot_option *opt;
 831
 832                 list_for_each_entry(&dev->boot_options, opt, list)
 833                         if (!strcmp(opt->option->id, id))
 834                                 return opt;
 835         }
 836
 837         return NULL;
 838 }
 839
 840 void device_handler_boot(struct device_handler *handler,
 841                 struct boot_command *cmd)
 842 {
 843         struct discover_boot_option *opt = NULL;
 844
 845         if (cmd->option_id && strlen(cmd->option_id))
 846                 opt = find_boot_option_by_id(handler, cmd->option_id);
 847
 848         if (handler->pending_boot)
 849                 boot_cancel(handler->pending_boot);
 850
 851         platform_pre_boot();
 852
 853         handler->pending_boot = boot(handler, opt, cmd, handler->dry_run,
 854                         boot_status, handler);
 855         handler->pending_boot_is_default = false;
 856 }
 857
 858 void device_handler_cancel_default(struct device_handler *handler)
 859 {
 860         struct boot_status status;
 861
 862         if (handler->timeout_waiter)
 863                 waiter_remove(handler->timeout_waiter);
 864
 865         handler->timeout_waiter = NULL;
 866         handler->autoboot_enabled = false;
 867
 868         /* we only send status if we had a default boot option queued */
 869         if (!handler->default_boot_option)
 870                 return;
 871
 872         pb_log("Cancelling default boot option\n");
 873
 874         if (handler->pending_boot && handler->pending_boot_is_default) {
 875                 boot_cancel(handler->pending_boot);
 876                 handler->pending_boot = NULL;
 877                 handler->pending_boot_is_default = false;
 878         }
 879
 880         handler->default_boot_option = NULL;
 881
 882         status.type = BOOT_STATUS_INFO;
 883         status.progress = -1;
 884         status.detail = NULL;
 885         status.message = _("Default boot cancelled");
 886
 887         discover_server_notify_boot_status(handler->server, &status);
 888 }
 889
 890 void device_handler_update_config(struct device_handler *handler,
 891                 struct config *config)
 892 {
 893         int rc;
 894
 895         rc = config_set(config);
 896         if (rc)
 897                 return;
 898
 899         discover_server_notify_config(handler->server, config);
 900         device_handler_update_lang(config->lang);
 901         device_handler_reinit(handler);
 902 }
 903
 904 static char *device_from_addr(void *ctx, struct pb_url *url)
 905 {
 906         char *ipaddr, *buf, *tok, *dev = NULL;
 907         const char *delim = " ";
 908         struct sockaddr_in *ip;
 909         struct sockaddr_in si;
 910         struct addrinfo *res;
 911         struct process *p;
 912         int rc;
 913
 914         /* Note: IPv4 only */
 915         rc = inet_pton(AF_INET, url->host, &(si.sin_addr));
 916         if (rc > 0) {
 917                 ipaddr = url->host;
 918         } else {
 919                 /* need to turn hostname into a valid IP */
 920                 rc = getaddrinfo(url->host, NULL, NULL, &res);
 921                 if (rc) {
 922                         pb_debug("%s: Invalid URL\n",__func__);
 923                         return NULL;
 924                 }
 925                 ipaddr = talloc_array(ctx,char,INET_ADDRSTRLEN);
 926                 ip = (struct sockaddr_in *) res->ai_addr;
 927                 inet_ntop(AF_INET, &(ip->sin_addr), ipaddr, INET_ADDRSTRLEN);
 928                 freeaddrinfo(res);
 929         }
 930
 931         const char *argv[] = {
 932                 pb_system_apps.ip,
 933                 "route", "show", "to", "match",
 934                 ipaddr,
 935                 NULL
 936         };
 937
 938         p = process_create(ctx);
 939
 940         p->path = pb_system_apps.ip;
 941         p->argv = argv;
 942         p->keep_stdout = true;
 943
 944         rc = process_run_sync(p);
 945
 946         if (rc) {
 947                 /* ip has complained for some reason; most likely
 948                  * there is no route to the host - bail out */
 949                 pb_debug("%s: No route to %s\n",__func__,url->host);
 950                 return NULL;
 951         }
 952
 953         buf = p->stdout_buf;
 954         /* If a route is found, ip-route output will be of the form
 955          * "... dev DEVNAME ... " */
 956         tok = strtok(buf, delim);
 957         while (tok) {
 958                 if (!strcmp(tok, "dev")) {
 959                         tok = strtok(NULL, delim);
 960                         dev = talloc_strdup(ctx, tok);
 961                         break;
 962                 }
 963                 tok = strtok(NULL, delim);
 964         }
 965
 966         process_release(p);
 967         if (dev)
 968                 pb_debug("%s: Found interface '%s'\n", __func__,dev);
 969         return dev;
 970 }
 971
 972
 973 void device_handler_process_url(struct device_handler *handler,
 974                 const char *url)
 975 {
 976         struct discover_context *ctx;
 977         struct discover_device *dev;
 978         struct boot_status *status;
 979         struct pb_url *pb_url;
 980         struct event *event;
 981         struct param *param;
 982
 983         status = talloc(handler, struct boot_status);
 984
 985         status->type = BOOT_STATUS_ERROR;
 986         status->progress = 0;
 987         status->detail = talloc_asprintf(status,
 988                         _("Received config URL %s"), url);
 989
 990         if (!handler->network) {
 991                 status->message = talloc_asprintf(handler,
 992                                         _("No network configured"));
 993                 goto msg;
 994         }
 995
 996         event = talloc(handler, struct event);
 997         event->type = EVENT_TYPE_USER;
 998         event->action = EVENT_ACTION_CONF;
 999
1000         event->params = talloc_array(event, struct param, 1);
1001         param = &event->params[0];
1002         param->name = talloc_strdup(event, "pxeconffile");
1003         param->value = talloc_strdup(event, url);
1004         event->n_params = 1;
1005
1006         pb_url = pb_url_parse(event, event->params->value);
1007         if (!pb_url || !pb_url->host) {
1008                 status->message = talloc_asprintf(handler,
1009                                         _("Invalid config URL!"));
1010                 goto msg;
1011         }
1012
1013         event->device = device_from_addr(event, pb_url);
1014         if (!event->device) {
1015                 status->message = talloc_asprintf(status,
1016                                         _("Unable to route to host %s"),
1017                                         pb_url->host);
1018                 goto msg;
1019         }
1020
1021         dev = discover_device_create(handler, event->device);
1022         ctx = device_handler_discover_context_create(handler, dev);
1023         ctx->event = event;
1024
1025         iterate_parsers(ctx);
1026
1027         device_handler_discover_context_commit(handler, ctx);
1028
1029         talloc_free(ctx);
1030
1031         status->type = BOOT_STATUS_INFO;
1032         status->message = talloc_asprintf(status, _("Config file %s parsed"),
1033                                         pb_url->file);
1034 msg:
1035         boot_status(handler, status);
1036         talloc_free(status);
1037 }
1038
1039 #ifndef PETITBOOT_TEST
1040
1041 static void device_handler_update_lang(const char *lang)
1042 {
1043         const char *cur_lang;
1044
1045         if (!lang)
1046                 return;
1047
1048         cur_lang = setlocale(LC_ALL, NULL);
1049         if (cur_lang && !strcmp(cur_lang, lang))
1050                 return;
1051
1052         setlocale(LC_ALL, lang);
1053 }
1054
1055 static int device_handler_init_sources(struct device_handler *handler)
1056 {
1057         /* init our device sources: udev, network and user events */
1058         handler->udev = udev_init(handler, handler->waitset);
1059         if (!handler->udev)
1060                 return -1;
1061
1062         handler->network = network_init(handler, handler->waitset,
1063                         handler->dry_run);
1064         if (!handler->network)
1065                 return -1;
1066
1067         handler->user_event = user_event_init(handler, handler->waitset);
1068         if (!handler->user_event)
1069                 return -1;
1070
1071         return 0;
1072 }
1073
1074 static void device_handler_reinit_sources(struct device_handler *handler)
1075 {
1076         /* if we haven't initialised sources previously (becuase we started in
1077          * safe mode), then init once here. */
1078         if (!(handler->udev || handler->network || handler->user_event)) {
1079                 device_handler_init_sources(handler);
1080                 return;
1081         }
1082
1083         udev_reinit(handler->udev);
1084
1085         network_shutdown(handler->network);
1086         handler->network = network_init(handler, handler->waitset,
1087                         handler->dry_run);
1088 }
1089
1090 static const char *fs_parameters(unsigned int rw_flags, const char *fstype)
1091 {
1092         if ((rw_flags | MS_RDONLY) != MS_RDONLY)
1093                 return "";
1094
1095         /* Avoid writing back to the disk on journaled filesystems */
1096         if (!strncmp(fstype, "ext4", strlen("ext4")))
1097                 return "norecovery";
1098         if (!strncmp(fstype, "xfs", strlen("xfs")))
1099                 return "norecovery";
1100
1101         return "";
1102 }
1103
1104 static bool check_existing_mount(struct discover_device *dev)
1105 {
1106         struct stat devstat, mntstat;
1107         struct mntent *mnt;
1108         FILE *fp;
1109         int rc;
1110
1111         rc = stat(dev->device_path, &devstat);
1112         if (rc) {
1113                 pb_debug("%s: stat failed: %s\n", __func__, strerror(errno));
1114                 return false;
1115         }
1116
1117         if (!S_ISBLK(devstat.st_mode)) {
1118                 pb_debug("%s: %s isn't a block device?\n", __func__,
1119                                 dev->device_path);
1120                 return false;
1121         }
1122
1123         fp = fopen("/proc/self/mounts", "r");
1124
1125         for (;;) {
1126                 mnt = getmntent(fp);
1127                 if (!mnt)
1128                         break;
1129
1130                 if (!mnt->mnt_fsname || mnt->mnt_fsname[0] != '/')
1131                         continue;
1132
1133                 rc = stat(mnt->mnt_fsname, &mntstat);
1134                 if (rc)
1135                         continue;
1136
1137                 if (!S_ISBLK(mntstat.st_mode))
1138                         continue;
1139
1140                 if (mntstat.st_rdev == devstat.st_rdev) {
1141                         dev->mount_path = talloc_strdup(dev, mnt->mnt_dir);
1142                         dev->mounted_rw = !!hasmntopt(mnt, "rw");
1143                         dev->mounted = true;
1144                         dev->unmount = false;
1145
1146                         pb_debug("%s: %s is already mounted (r%c) at %s\n",
1147                                         __func__, dev->device_path,
1148                                         dev->mounted_rw ? 'w' : 'o',
1149                                         mnt->mnt_dir);
1150                         break;
1151                 }
1152         }
1153
1154         fclose(fp);
1155
1156         return mnt != NULL;
1157 }
1158
1159 static int mount_device(struct discover_device *dev)
1160 {
1161         const char *fstype;
1162         int rc;
1163
1164         if (!dev->device_path)
1165                 return -1;
1166
1167         if (dev->mounted)
1168                 return 0;
1169
1170         if (check_existing_mount(dev))
1171                 return 0;
1172
1173         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1174         if (!fstype)
1175                 return 0;
1176
1177         /* ext3 treats the norecovery option as an error, so mount the device
1178          * as an ext4 filesystem instead */
1179         if (!strncmp(fstype, "ext3", strlen("ext3"))) {
1180                 pb_debug("Mounting ext3 filesystem as ext4\n");
1181                 fstype = talloc_asprintf(dev, "ext4");
1182         }
1183
1184         dev->mount_path = join_paths(dev, mount_base(),
1185                                         dev->device_path);
1186
1187         if (pb_mkdir_recursive(dev->mount_path)) {
1188                 pb_log("couldn't create mount directory %s: %s\n",
1189                                 dev->mount_path, strerror(errno));
1190                 goto err_free;
1191         }
1192
1193         pb_log("mounting device %s read-only\n", dev->device_path);
1194         errno = 0;
1195         rc = mount(dev->device_path, dev->mount_path, fstype,
1196                         MS_RDONLY | MS_SILENT,
1197                         fs_parameters(MS_RDONLY, fstype));
1198         if (!rc) {
1199                 dev->mounted = true;
1200                 dev->mounted_rw = false;
1201                 dev->unmount = true;
1202                 return 0;
1203         }
1204
1205         pb_log("couldn't mount device %s: mount failed: %s\n",
1206                         dev->device_path, strerror(errno));
1207
1208         pb_rmdir_recursive(mount_base(), dev->mount_path);
1209 err_free:
1210         talloc_free(dev->mount_path);
1211         dev->mount_path = NULL;
1212         return -1;
1213 }
1214
1215 static int umount_device(struct discover_device *dev)
1216 {
1217         int rc;
1218
1219         if (!dev->mounted || !dev->unmount)
1220                 return 0;
1221
1222         pb_log("unmounting device %s\n", dev->device_path);
1223         rc = umount(dev->mount_path);
1224         if (rc)
1225                 return -1;
1226
1227         dev->mounted = false;
1228
1229         pb_rmdir_recursive(mount_base(), dev->mount_path);
1230
1231         talloc_free(dev->mount_path);
1232         dev->mount_path = NULL;
1233
1234         return 0;
1235 }
1236
1237 int device_request_write(struct discover_device *dev, bool *release)
1238 {
1239         const char *fstype;
1240         int rc;
1241
1242         *release = false;
1243
1244         if (!dev->mounted)
1245                 return -1;
1246
1247         if (dev->mounted_rw)
1248                 return 0;
1249
1250         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1251
1252         pb_log("remounting device %s read-write\n", dev->device_path);
1253
1254         rc = umount(dev->mount_path);
1255         if (rc) {
1256                 pb_log("Failed to unmount %s\n", dev->mount_path);
1257                 return -1;
1258         }
1259         rc = mount(dev->device_path, dev->mount_path, fstype,
1260                         MS_SILENT,
1261                         fs_parameters(MS_REMOUNT, fstype));
1262         if (rc)
1263                 goto mount_ro;
1264
1265         dev->mounted_rw = true;
1266         *release = true;
1267         return 0;
1268
1269 mount_ro:
1270         pb_log("Unable to remount device %s read-write\n", dev->device_path);
1271         rc = mount(dev->device_path, dev->mount_path, fstype,
1272                         MS_RDONLY | MS_SILENT,
1273                         fs_parameters(MS_RDONLY, fstype));
1274         if (rc)
1275                 pb_log("Unable to recover mount for %s\n", dev->device_path);
1276         return -1;
1277 }
1278
1279 void device_release_write(struct discover_device *dev, bool release)
1280 {
1281         const char *fstype;
1282
1283         if (!release)
1284                 return;
1285
1286         fstype = discover_device_get_param(dev, "ID_FS_TYPE");
1287
1288         pb_log("remounting device %s read-only\n", dev->device_path);
1289         mount(dev->device_path, dev->mount_path, "",
1290                         MS_REMOUNT | MS_RDONLY | MS_SILENT,
1291                         fs_parameters(MS_RDONLY, fstype));
1292         dev->mounted_rw = false;
1293 }
1294
1295 #else
1296
1297 static void device_handler_update_lang(const char *lang __attribute__((unused)))
1298 {
1299 }
1300
1301 static int device_handler_init_sources(
1302                 struct device_handler *handler __attribute__((unused)))
1303 {
1304         return 0;
1305 }
1306
1307 static void device_handler_reinit_sources(
1308                 struct device_handler *handler __attribute__((unused)))
1309 {
1310 }
1311
1312 static int umount_device(struct discover_device *dev __attribute__((unused)))
1313 {
1314         return 0;
1315 }
1316
1317 static int __attribute__((unused)) mount_device(
1318                 struct discover_device *dev __attribute__((unused)))
1319 {
1320         return 0;
1321 }
1322
1323 int device_request_write(struct discover_device *dev __attribute__((unused)),
1324                 bool *release)
1325 {
1326         *release = true;
1327         return 0;
1328 }
1329
1330 void device_release_write(struct discover_device *dev __attribute__((unused)),
1331         bool release __attribute__((unused)))
1332 {
1333 }
1334
1335 #endif
1336