git.ozlabs.org Git - petitboot/blob - discover/paths.c

   1 #if defined(HAVE_CONFIG_H)
   2 #include "config.h"
   3 #endif
   4
   5 #include <assert.h>
   6 #include <netdb.h>
   7 #include <string.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <sys/socket.h>
  11 #include <sys/stat.h>
  12 #include <sys/types.h>
  13
  14 #include <talloc/talloc.h>
  15 #include <system/system.h>
  16 #include <process/process.h>
  17 #include <url/url.h>
  18 #include <log/log.h>
  19 #include "i18n/i18n.h"
  20
  21 #include "paths.h"
  22 #include "device-handler.h"
  23 #include "sysinfo.h"
  24
  25 #define DEVICE_MOUNT_BASE (LOCAL_STATE_DIR "/petitboot/mnt")
  26
  27
  28 struct list     pending_network_jobs;
  29
  30 struct network_job {
  31         struct load_task        *task;
  32         int                     flags;
  33
  34         struct list_item        list;
  35 };
  36
  37 struct load_task {
  38         struct pb_url           *url;
  39         struct process          *process;
  40         struct load_url_result  *result;
  41         bool                    async;
  42         load_url_complete       async_cb;
  43         void                    *async_data;
  44 };
  45
  46 const char *mount_base(void)
  47 {
  48         return DEVICE_MOUNT_BASE;
  49 }
  50
  51 char *join_paths(void *alloc_ctx, const char *a, const char *b)
  52 {
  53         char *full_path;
  54
  55         full_path = talloc_array(alloc_ctx, char, strlen(a) + strlen(b) + 2);
  56
  57         strcpy(full_path, a);
  58         if (b[0] != '/' && a[strlen(a) - 1] != '/')
  59                 strcat(full_path, "/");
  60         strcat(full_path, b);
  61
  62         return full_path;
  63 }
  64
  65 #ifndef PETITBOOT_TEST
  66
  67 #ifdef WITH_BUSYBOX
  68 static inline bool have_busybox(void) { return true; }
  69 #else
  70 static inline bool have_busybox(void) { return false; }
  71 #endif
  72
  73 static char *local_name(void *ctx)
  74 {
  75         char *ret, tmp[] = "/tmp/pb-XXXXXX";
  76         mode_t oldmask;
  77         int fd;
  78
  79         oldmask = umask(0644);
  80         fd = mkstemp(tmp);
  81         umask(oldmask);
  82
  83         if (fd < 0)
  84                 return NULL;
  85
  86         close(fd);
  87
  88         ret = talloc_strdup(ctx, tmp);
  89
  90         return ret;
  91 }
  92
  93 static void load_url_result_cleanup_local(struct load_url_result *result)
  94 {
  95         if (result->cleanup_local)
  96                 unlink(result->local);
  97 }
  98
  99 static void load_url_process_exit(struct process *process)
 100 {
 101         struct load_task *task = process->data;
 102         struct load_url_result *result;
 103         load_url_complete cb;
 104         void *data;
 105
 106         pb_debug("The download client '%s' [pid %d, url %s] exited, rc %d\n",
 107                         process->path, process->pid, task->url->full,
 108                         process->exit_status);
 109
 110         result = task->result;
 111         data = task->async_data;
 112         cb = task->async_cb;
 113
 114         if (result->status == LOAD_CANCELLED) {
 115                 load_url_result_cleanup_local(result);
 116         } else if (process_exit_ok(process)) {
 117                 result->status = LOAD_OK;
 118         } else {
 119                 result->status = LOAD_ERROR;
 120                 load_url_result_cleanup_local(result);
 121                 pb_debug("Download client stdout buffer:\n%s\n",
 122                                 process->stdout_buf);
 123         }
 124
 125         if (result->status == LOAD_OK && process->stdout_data)
 126                 device_handler_status_info(process->stdout_data,
 127                                 _("Download complete: %s"), task->url->file);
 128
 129         /* The load callback may well free the ctx, which was the
 130          * talloc parent of the task. Therefore, we want to do our cleanup
 131          * before invoking it
 132          */
 133         process_release(process);
 134         talloc_free(task);
 135         result->task = NULL;
 136
 137         cb(result, data);
 138 }
 139
 140 /*
 141  * Callback to retrieve progress information from Busybox utilities.
 142  * Busybox utilities use a common progress bar format which progress percentage
 143  * and current size can be can be parsed from.
 144  */
 145 static int busybox_progress_cb(void *arg)
 146 {
 147         const char *busybox_fmt = "%*s %u%*[%* |]%u%c %*u:%*u:%*u ETA\n";
 148         struct process_info *procinfo = arg;
 149         char *n, *s, suffix, *line = NULL;
 150         struct device_handler *handler;
 151         unsigned int percentage, size;
 152         struct process *p;
 153         int rc;
 154
 155         if (!arg)
 156                 return -1;
 157
 158         p = procinfo_get_process(procinfo);
 159         handler = p->stdout_data;
 160
 161         rc = process_stdout_custom(procinfo, &line);
 162
 163         if (rc) {
 164                 /* Unregister ourselves from progress tracking */
 165                 device_handler_status_download_remove(handler, procinfo);
 166         }
 167
 168         if (rc || !line)
 169                 return rc;
 170
 171         rc = sscanf(line, busybox_fmt, &percentage, &size, &suffix);
 172
 173         /*
 174          * Many unrecognised lines are partial updates. If we see a partial
 175          * line with a newline character, see if we can match a valid line
 176          * at the end of stdout_buf
 177          */
 178         if (rc != 3) {
 179                 n = strchr(line, '\n');
 180                 if (n)
 181                         for (s = n - 1; s >= p->stdout_buf; s--)
 182                                 if (*s == '\n') {
 183                                         rc = sscanf(s + 1, busybox_fmt,
 184                                                 &percentage, &size, &suffix);
 185                                         break;
 186                                 }
 187         }
 188
 189         if (rc != 3)
 190                 percentage = size = 0;
 191
 192         device_handler_status_download(handler, procinfo,
 193                         percentage, size, suffix);
 194
 195         return 0;
 196 }
 197
 198
 199
 200 static void load_process_to_local_file(struct load_task *task,
 201                 const char **argv, int argv_local_idx)
 202 {
 203         int rc;
 204
 205         task->result->local = local_name(task->result);
 206         if (!task->result->local) {
 207                 task->result->status = LOAD_ERROR;
 208                 return;
 209         }
 210         task->result->cleanup_local = true;
 211
 212         if (argv_local_idx)
 213                 argv[argv_local_idx] = task->result->local;
 214
 215         task->process->argv = argv;
 216         task->process->path = argv[0];
 217
 218         if (task->async) {
 219                 rc = process_run_async(task->process);
 220                 if (rc) {
 221                         process_release(task->process);
 222                         task->process = NULL;
 223                 }
 224                 task->result->status = rc ? LOAD_ERROR : LOAD_ASYNC;
 225         } else {
 226                 rc = process_run_sync(task->process);
 227                 if (rc || !process_exit_ok(task->process))
 228                         task->result->status = LOAD_ERROR;
 229                 else
 230                         task->result->status = LOAD_OK;
 231                 process_release(task->process);
 232                 task->process = NULL;
 233         }
 234 }
 235
 236 /**
 237  * pb_load_nfs - Create a mountpoint, set the local file within that
 238  * mountpoint, and run the appropriate mount command
 239  */
 240
 241 static void load_nfs(struct load_task *task)
 242 {
 243         char *mountpoint, *opts;
 244         int rc;
 245         const char *argv[] = {
 246                         pb_system_apps.mount,
 247                         "-t", "nfs",
 248                         NULL,                   /* 3: opts */
 249                         task->url->host,
 250                         task->url->dir,
 251                         NULL,                   /* 6: mountpoint */
 252                         NULL,
 253         };
 254
 255         task->result->status = LOAD_ERROR;
 256         mountpoint = local_name(task->result);
 257         if (!mountpoint)
 258                 return;
 259         task->result->cleanup_local = true;
 260         argv[6] = mountpoint;
 261
 262         rc = pb_mkdir_recursive(mountpoint);
 263         if (rc)
 264                 return;
 265
 266         opts = talloc_strdup(NULL, "ro,nolock,nodiratime");
 267         argv[3] = opts;
 268
 269         if (task->url->port)
 270                 opts = talloc_asprintf_append(opts, ",port=%s",
 271                                                 task->url->port);
 272
 273         task->result->local = talloc_asprintf(task->result, "%s/%s",
 274                                                         mountpoint,
 275                                                         task->url->path);
 276
 277         task->process->path = pb_system_apps.mount;
 278         task->process->argv = argv;
 279
 280         if (task->async) {
 281                 rc = process_run_async(task->process);
 282                 if (rc) {
 283                         process_release(task->process);
 284                         task->process = NULL;
 285                 }
 286                 task->result->status = rc ? LOAD_ERROR : LOAD_ASYNC;
 287         } else {
 288                 rc = process_run_sync(task->process);
 289                 task->result->status = rc ? LOAD_ERROR : LOAD_OK;
 290                 process_release(task->process);
 291                 task->process = NULL;
 292         }
 293
 294         talloc_free(opts);
 295 }
 296
 297 static void load_sftp(struct load_task *task)
 298 {
 299         const char *argv[] = {
 300                         pb_system_apps.sftp,
 301                         NULL,           /* 1: host:path */
 302                         NULL,           /* 2: local file */
 303                         NULL,
 304         };
 305
 306         argv[1] = talloc_asprintf(task, "%s:%s",
 307                                 task->url->host, task->url->path);
 308         load_process_to_local_file(task, argv, 2);
 309 }
 310
 311 static enum tftp_type check_tftp_type(void *ctx)
 312 {
 313         const char *argv[] = { pb_system_apps.tftp, "-V", NULL };
 314         struct process *process;
 315         enum tftp_type type;
 316         int rc;
 317
 318         process = process_create(ctx);
 319         process->path = pb_system_apps.tftp;
 320         process->argv = argv;
 321         process->keep_stdout = true;
 322         process->add_stderr = true;
 323         rc = process_run_sync(process);
 324
 325         if (rc || !process->stdout_buf || process->stdout_len == 0) {
 326                 pb_log("Can't check TFTP client type!\n");
 327                 type = TFTP_TYPE_BROKEN;
 328
 329         } else if (memmem(process->stdout_buf, process->stdout_len,
 330                                 "tftp-hpa", strlen("tftp-hpa"))) {
 331                 pb_debug("Found TFTP client type: tftp-hpa\n");
 332                 type = TFTP_TYPE_HPA;
 333
 334         } else if (memmem(process->stdout_buf, process->stdout_len,
 335                                 "BusyBox", strlen("BusyBox"))) {
 336                 pb_debug("Found TFTP client type: BusyBox tftp\n");
 337                 type = TFTP_TYPE_BUSYBOX;
 338
 339         } else {
 340                 pb_log("Unknown TFTP client type!\n");
 341                 type = TFTP_TYPE_BROKEN;
 342         }
 343
 344         process_release(process);
 345         return type;
 346 }
 347
 348 static void load_tftp(struct load_task *task)
 349 {
 350         const char *port = "69";
 351         const char *argv[10] = {
 352                 pb_system_apps.tftp,
 353         };
 354
 355         if (task->url->port)
 356                 port = task->url->port;
 357
 358         if (tftp_type == TFTP_TYPE_UNKNOWN)
 359                 tftp_type = check_tftp_type(task);
 360
 361         if (tftp_type == TFTP_TYPE_BUSYBOX) {
 362                 argv[1] = "-g";
 363                 argv[2] = "-l";
 364                 argv[3] = NULL; /* 3: local file */
 365                 argv[4] = "-r";
 366                 argv[5] = task->url->path;
 367                 argv[6] = task->url->host;
 368                 argv[7] = port;
 369                 argv[8] = NULL;
 370
 371                 load_process_to_local_file(task, argv, 3);
 372
 373         } else if (tftp_type == TFTP_TYPE_HPA) {
 374                 argv[1] = "-m";
 375                 argv[2] = "binary";
 376                 argv[3] = task->url->host;
 377                 argv[4] = port;
 378                 argv[5] = "-c";
 379                 argv[6] = "get";
 380                 argv[7] = task->url->path;
 381                 argv[8] = NULL; /* 8: local file */
 382                 argv[9] = NULL;
 383                 load_process_to_local_file(task, argv, 8);
 384
 385         } else
 386                 task->result->status = LOAD_ERROR;
 387 }
 388
 389 enum wget_flags {
 390         wget_empty                      = 0x1,
 391         wget_no_check_certificate       = 0x2,
 392         wget_verbose                    = 0x4,
 393 };
 394
 395 /**
 396  * pb_load_wget - Loads a remote file via wget and returns the local file path.
 397  *
 398  * Returns the local file path in a talloc'ed character string on success,
 399  * or NULL on error.
 400  */
 401
 402 static void load_wget(struct load_task *task, int flags)
 403 {
 404         const char *argv[] = {
 405                 pb_system_apps.wget,
 406                 "-O",
 407                 NULL, /* 2: local file */
 408                 NULL, /* 3 (optional): --quiet */
 409                 NULL, /* 4 (optional): --no-check-certificate */
 410                 NULL, /* 5: URL */
 411                 NULL,
 412         };
 413         int i;
 414
 415         if (task->process->stdout_cb)
 416                 flags |= wget_verbose;
 417
 418         i = 3;
 419 #if defined(DEBUG)
 420         flags |= wget_verbose;
 421 #endif
 422         if ((flags & wget_verbose) == 0)
 423                 argv[i++] = "--quiet";
 424
 425         if (flags & wget_no_check_certificate)
 426                 argv[i++] = "--no-check-certificate";
 427
 428         argv[i] = task->url->full;
 429
 430         load_process_to_local_file(task, argv, 2);
 431 }
 432
 433 /* Although we don't need to load anything for a local path (we just return
 434  * the path from the file:// URL), the other load helpers will error-out on
 435  * non-existant files. So, do the same here with an access() check on the local
 436  * filename.
 437  */
 438 static void load_local(struct load_task *task)
 439 {
 440         struct load_url_result *result = task->result;
 441         int rc;
 442
 443         rc = access(task->url->path, F_OK);
 444         if (rc) {
 445                 result->status = LOAD_ERROR;
 446         } else {
 447                 result->local = talloc_strdup(task->result, task->url->path);
 448                 result->status = LOAD_OK;
 449         }
 450
 451         task->async_cb(task->result, task->async_data);
 452 }
 453
 454 static void load_url_async_start_pending(struct load_task *task, int flags)
 455 {
 456         pb_log("Starting pending job for %s\n", task->url->full);
 457
 458         switch (task->url->scheme) {
 459         case pb_url_ftp:
 460         case pb_url_http:
 461                 load_wget(task, flags);
 462                 break;
 463         case pb_url_https:
 464                 flags |= wget_no_check_certificate;
 465                 load_wget(task, flags);
 466                 break;
 467         case pb_url_nfs:
 468                 load_nfs(task);
 469                 break;
 470         case pb_url_sftp:
 471                 load_sftp(task);
 472                 break;
 473         case pb_url_tftp:
 474                 load_tftp(task);
 475                 break;
 476         default:
 477                 /* Shouldn't be a need via this path but.. */
 478                 load_local(task);
 479                 break;
 480         }
 481
 482         if (task->result->status == LOAD_ERROR) {
 483                 pb_log("Pending job failed for %s\n", task->url->full);
 484                 load_url_result_cleanup_local(task->result);
 485                 talloc_free(task->result);
 486                 talloc_free(task);
 487         }
 488 }
 489
 490 void pending_network_jobs_start(void)
 491 {
 492         struct network_job *job, *tmp;
 493
 494         if (!pending_network_jobs.head.next)
 495                 return;
 496
 497         list_for_each_entry_safe(&pending_network_jobs, job, tmp, list) {
 498                 load_url_async_start_pending(job->task, job->flags);
 499                 list_remove(&job->list);
 500         }
 501 }
 502
 503 void pending_network_jobs_cancel(void)
 504 {
 505         struct network_job *job, *tmp;
 506
 507         if (!pending_network_jobs.head.next)
 508                 return;
 509
 510         list_for_each_entry_safe(&pending_network_jobs, job, tmp, list)
 511                 talloc_free(job);
 512         list_init(&pending_network_jobs);
 513 }
 514
 515 static void pending_network_jobs_add(struct load_task *task, int flags)
 516 {
 517         struct network_job *job;
 518
 519         if (!pending_network_jobs.head.next)
 520                 list_init(&pending_network_jobs);
 521
 522         job = talloc(task, struct network_job);
 523         if (!job) {
 524                 pb_log("Failed to allocate space for pending job\n");
 525                 return;
 526         }
 527
 528         job->task = task;
 529         job->flags = flags;
 530         list_add_tail(&pending_network_jobs, &job->list);
 531 }
 532
 533
 534 /**
 535  * load_url - Loads a (possibly) remote URL and returns the local file
 536  * path.
 537  * @ctx: The talloc context to associate with the returned string.
 538  * @url: The remote file URL.
 539  * @tempfile: An optional variable pointer to be set when a temporary local
 540  *  file is created.
 541  * @url_cb: An optional callback pointer if the caller wants to load url
 542  *  asynchronously.
 543  *
 544  * Returns the local file path in a talloc'ed character string on success,
 545  * or NULL on error.
 546  */
 547
 548 struct load_url_result *load_url_async(void *ctx, struct pb_url *url,
 549                 load_url_complete async_cb, void *async_data,
 550                 waiter_cb stdout_cb, void *stdout_data)
 551 {
 552         struct load_url_result *result;
 553         struct load_task *task;
 554         struct addrinfo *res;
 555         int flags = 0;
 556
 557         if (!url)
 558                 return NULL;
 559
 560         task = talloc_zero(ctx, struct load_task);
 561         task->url = url;
 562         task->async = async_cb != NULL;
 563         task->result = talloc_zero(ctx, struct load_url_result);
 564         task->result->task = task;
 565         task->result->url = url;
 566         task->process = process_create(task);
 567         if (task->async) {
 568                 task->async_cb = async_cb;
 569                 task->async_data = async_data;
 570                 task->process->exit_cb = load_url_process_exit;
 571                 task->process->data = task;
 572                 task->process->stdout_cb = stdout_cb;
 573                 task->process->stdout_data = stdout_data;
 574         }
 575
 576         if (!stdout_cb && stdout_data && have_busybox())
 577                 task->process->stdout_cb = busybox_progress_cb;
 578
 579         /* Make sure we save output for any task that has a custom handler */
 580         if (task->process->stdout_cb) {
 581                 task->process->add_stderr = true;
 582                 task->process->keep_stdout = true;
 583         }
 584
 585         /* If the url is remote but network is not yet available queue up this
 586          * load for later */
 587         if (url->scheme != pb_url_file &&
 588                         getaddrinfo(url->host, NULL, NULL, &res) != 0) {
 589                 pb_log("load task for %s queued pending network\n", url->full);
 590                 pending_network_jobs_add(task, flags);
 591                 task->result->status = LOAD_ASYNC;
 592                 return task->result;
 593         }
 594
 595         switch (url->scheme) {
 596         case pb_url_ftp:
 597         case pb_url_http:
 598                 load_wget(task, flags);
 599                 break;
 600         case pb_url_https:
 601                 flags |= wget_no_check_certificate;
 602                 load_wget(task, flags);
 603                 break;
 604         case pb_url_nfs:
 605                 load_nfs(task);
 606                 break;
 607         case pb_url_sftp:
 608                 load_sftp(task);
 609                 break;
 610         case pb_url_tftp:
 611                 load_tftp(task);
 612                 break;
 613         default:
 614                 load_local(task);
 615                 break;
 616         }
 617
 618         result = task->result;
 619         if (result->status == LOAD_ERROR) {
 620                 load_url_result_cleanup_local(task->result);
 621                 talloc_free(result);
 622                 talloc_free(task);
 623                 return NULL;
 624         }
 625
 626         if (!task->async || result->status == LOAD_OK)
 627                 talloc_free(task);
 628
 629         return result;
 630 }
 631
 632 struct load_url_result *load_url(void *ctx, struct pb_url *url)
 633 {
 634         return load_url_async(ctx, url, NULL, NULL, NULL, NULL);
 635 }
 636
 637 void load_url_async_cancel(struct load_url_result *res)
 638 {
 639         struct load_task *task = res->task;
 640
 641         /* the completion callback may have already been called; this clears
 642          * res->task */
 643         if (!task)
 644                 return;
 645
 646         if (res->status == LOAD_CANCELLED)
 647                 return;
 648
 649         assert(task->async);
 650         assert(task->process);
 651
 652         res->status = LOAD_CANCELLED;
 653         process_stop_async(task->process);
 654 }
 655
 656 #else
 657
 658 static void __attribute__((unused)) load_local(
 659                 struct load_task *task __attribute__((unused)))
 660 {
 661 }
 662 static void __attribute__((unused)) load_wget(
 663                 struct load_task *task __attribute__((unused)),
 664                 int flags __attribute__((unused)))
 665 {
 666 }
 667 static void __attribute__((unused)) load_tftp(
 668                 struct load_task *task __attribute__((unused)))
 669 {
 670 }
 671 static void __attribute__((unused)) load_sftp(
 672                 struct load_task *task __attribute__((unused)))
 673 {
 674 }
 675 static void __attribute__((unused)) load_nfs(
 676                 struct load_task *task __attribute__((unused)))
 677 {
 678 }
 679 static void __attribute__((unused)) load_url_process_exit(
 680                 struct process *process __attribute__((unused)))
 681 {
 682 }
 683
 684 #endif