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