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

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