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