git.ozlabs.org Git - petitboot/blob - lib/pb-protocol/pb-protocol.c

   1
   2 #include <assert.h>
   3 #include <errno.h>
   4 #include <string.h>
   5 #include <stdbool.h>
   6 #include <stdint.h>
   7 #include <asm/byteorder.h>
   8
   9 #include <talloc/talloc.h>
  10 #include <list/list.h>
  11 #include <log/log.h>
  12
  13 #include "pb-protocol.h"
  14
  15
  16 /* Message format:
  17  *
  18  * 4-byte action, determines the remaining message content
  19  * 4-byte total payload len
  20  *   - not including action and payload len header
  21  *
  22  * action = 0x1: device add message
  23  *  payload:
  24  *   4-byte len, id
  25  *   1-byte type
  26  *   4-byte len, name
  27  *   4-byte len, description
  28  *   4-byte len, icon_file
  29  *
  30  *   4-byte option count
  31  *   for each option:
  32  *    4-byte len, id
  33  *    4-byte len, name
  34  *    4-byte len, description
  35  *    4-byte len, icon_file
  36  *    4-byte len, boot_image_file
  37  *    4-byte len, initrd_file
  38  *    4-byte len, dtb_file
  39  *    4-byte len, boot_args
  40  *
  41  * action = 0x2: device remove message
  42  *  payload:
  43  *   4-byte len, id
  44  *
  45  * action = 0x3: boot
  46  *  payload:
  47  *   4-byte len, boot option id
  48  *   4-byte len, boot_image_file
  49  *   4-byte len, initrd_file
  50  *   4-byte len, dtb_file
  51  *   4-byte len, boot_args
  52  *
  53  */
  54
  55 void pb_protocol_dump_device(const struct device *dev, const char *text,
  56         FILE *stream)
  57 {
  58         struct boot_option *opt;
  59
  60         fprintf(stream, "%snew dev:\n", text);
  61         fprintf(stream, "%s\tid:   %s\n", text, dev->id);
  62         fprintf(stream, "%s\tname: %s\n", text, dev->name);
  63         fprintf(stream, "%s\tdesc: %s\n", text, dev->description);
  64         fprintf(stream, "%s\ticon: %s\n", text, dev->icon_file);
  65         fprintf(stream, "%s\tboot options:\n", text);
  66         list_for_each_entry(&dev->boot_options, opt, list) {
  67                 fprintf(stream, "%s\t\tid:   %s\n", text, opt->id);
  68                 fprintf(stream, "%s\t\tname: %s\n", text, opt->name);
  69                 fprintf(stream, "%s\t\tdesc: %s\n", text, opt->description);
  70                 fprintf(stream, "%s\t\ticon: %s\n", text, opt->icon_file);
  71                 fprintf(stream, "%s\t\tboot: %s\n", text, opt->boot_image_file);
  72                 fprintf(stream, "%s\t\tinit: %s\n", text, opt->initrd_file);
  73                 fprintf(stream, "%s\t\tdtb:  %s\n", text, opt->dtb_file);
  74                 fprintf(stream, "%s\t\targs: %s\n", text, opt->boot_args);
  75         }
  76 }
  77
  78 int pb_protocol_device_cmp(const struct device *a, const struct device *b)
  79 {
  80         return !strcmp(a->id, b->id);
  81 }
  82
  83 int pb_protocol_boot_option_cmp(const struct boot_option *a,
  84         const struct boot_option *b)
  85 {
  86         return !strcmp(a->id, b->id);
  87 }
  88
  89 /* Write a string into the buffer, starting at pos.
  90  *
  91  * Returns the total length used for the write, including length header.
  92  */
  93 int pb_protocol_serialise_string(char *pos, const char *str)
  94 {
  95         int len = 0;
  96
  97         if (str)
  98                 len = strlen(str);
  99
 100         *(uint32_t *)pos = __cpu_to_be32(len);
 101         pos += sizeof(uint32_t);
 102
 103         memcpy(pos, str, len);
 104
 105         return len + sizeof(uint32_t);
 106 }
 107
 108 /* Read a string from a buffer, allocating the new string as necessary.
 109  *
 110  * @param[in] ctx       The talloc context to base the allocation on
 111  * @param[in,out] pos   Where to start reading
 112  * @param[in,out] len   The amount of data remaining in the buffer
 113  * @param[out] str      Pointer to resuling string
 114  * @return              zero on success, non-zero on failure
 115  */
 116 static int read_string(void *ctx, const char **pos, unsigned int *len,
 117         char **str)
 118 {
 119         uint32_t str_len, read_len;
 120
 121         if (*len < sizeof(uint32_t))
 122                 return -1;
 123
 124         str_len = __be32_to_cpu(*(uint32_t *)(*pos));
 125         read_len = sizeof(uint32_t);
 126
 127         if (read_len + str_len > *len)
 128                 return -1;
 129
 130         if (str_len == 0)
 131                 *str = NULL;
 132         else
 133                 *str = talloc_strndup(ctx, *pos + read_len, str_len);
 134
 135         read_len += str_len;
 136
 137         /* all ok, update the caller's pointers */
 138         *pos += read_len;
 139         *len -= read_len;
 140
 141         return 0;
 142 }
 143
 144 static int read_u32(const char **pos, unsigned int *len, unsigned int *p)
 145 {
 146         if (*len < sizeof(uint32_t))
 147                 return -1;
 148
 149         *p = (unsigned int)__be32_to_cpu(*(uint32_t *)(*pos));
 150         *pos += sizeof(uint32_t);
 151         *len -= sizeof(uint32_t);
 152
 153         return 0;
 154 }
 155
 156 char *pb_protocol_deserialise_string(void *ctx,
 157                 const struct pb_protocol_message *message)
 158 {
 159         const char *buf;
 160         char *str;
 161         unsigned int len;
 162
 163         len = message->payload_len;
 164         buf = message->payload;
 165
 166         if (read_string(ctx, &buf, &len, &str))
 167                 return NULL;
 168
 169         return str;
 170 }
 171
 172 static int optional_strlen(const char *str)
 173 {
 174         if (!str)
 175                 return 0;
 176         return strlen(str);
 177 }
 178
 179 int pb_protocol_device_len(const struct device *dev)
 180 {
 181         return  4 + optional_strlen(dev->id) +
 182                 sizeof(dev->type) +
 183                 4 + optional_strlen(dev->name) +
 184                 4 + optional_strlen(dev->description) +
 185                 4 + optional_strlen(dev->icon_file);
 186 }
 187
 188 int pb_protocol_boot_option_len(const struct boot_option *opt)
 189 {
 190
 191         return  4 + optional_strlen(opt->device_id) +
 192                 4 + optional_strlen(opt->id) +
 193                 4 + optional_strlen(opt->name) +
 194                 4 + optional_strlen(opt->description) +
 195                 4 + optional_strlen(opt->icon_file) +
 196                 4 + optional_strlen(opt->boot_image_file) +
 197                 4 + optional_strlen(opt->initrd_file) +
 198                 4 + optional_strlen(opt->dtb_file) +
 199                 4 + optional_strlen(opt->boot_args) +
 200                 sizeof(opt->is_default);
 201 }
 202
 203 int pb_protocol_boot_len(const struct boot_command *boot)
 204 {
 205         return  4 + optional_strlen(boot->option_id) +
 206                 4 + optional_strlen(boot->boot_image_file) +
 207                 4 + optional_strlen(boot->initrd_file) +
 208                 4 + optional_strlen(boot->dtb_file) +
 209                 4 + optional_strlen(boot->boot_args);
 210 }
 211
 212 int pb_protocol_boot_status_len(const struct boot_status *status)
 213 {
 214         return  4 +
 215                 4 + optional_strlen(status->message) +
 216                 4 + optional_strlen(status->detail) +
 217                 4;
 218 }
 219
 220 int pb_protocol_system_info_len(const struct system_info *sysinfo)
 221 {
 222         unsigned int len, i;
 223
 224         len =   4 + optional_strlen(sysinfo->type) +
 225                 4 + optional_strlen(sysinfo->identifier) +
 226                 4 + 4;
 227
 228         for (i = 0; i < sysinfo->n_interfaces; i++) {
 229                 struct interface_info *if_info = sysinfo->interfaces[i];
 230                 len +=  4 + if_info->hwaddr_size +
 231                         4 + optional_strlen(if_info->name) +
 232                         sizeof(if_info->link);
 233         }
 234
 235         for (i = 0; i < sysinfo->n_blockdevs; i++) {
 236                 struct blockdev_info *bd_info = sysinfo->blockdevs[i];
 237                 len +=  4 + optional_strlen(bd_info->name) +
 238                         4 + optional_strlen(bd_info->uuid) +
 239                         4 + optional_strlen(bd_info->mountpoint);
 240         }
 241
 242         return len;
 243 }
 244
 245 static int pb_protocol_interface_config_len(struct interface_config *conf)
 246 {
 247         unsigned int len;
 248
 249         len =   sizeof(conf->hwaddr) +
 250                 4 /* conf->ignore */;
 251
 252         if (conf->ignore)
 253                 return len;
 254
 255         len += 4 /* conf->method */;
 256
 257         if (conf->method == CONFIG_METHOD_STATIC) {
 258                 len += 4 + optional_strlen(conf->static_config.address);
 259                 len += 4 + optional_strlen(conf->static_config.gateway);
 260         }
 261
 262         return len;
 263 }
 264
 265 int pb_protocol_config_len(const struct config *config)
 266 {
 267         unsigned int i, len;
 268
 269         len =   4 /* config->autoboot_enabled */ +
 270                 4 /* config->autoboot_timeout_sec */ +
 271                 4 /* config->safe_mode */;
 272
 273         len += 4;
 274         for (i = 0; i < config->network.n_interfaces; i++)
 275                 len += pb_protocol_interface_config_len(
 276                                 config->network.interfaces[i]);
 277
 278         len += 4;
 279         for (i = 0; i < config->network.n_dns_servers; i++)
 280                 len += 4 + optional_strlen(config->network.dns_servers[i]);
 281
 282         len += 4;
 283         for (i = 0; i < config->n_autoboot_opts; i++) {
 284                 if (config->autoboot_opts[i].boot_type == BOOT_DEVICE_TYPE)
 285                         len += 4 + 4;
 286                 else
 287                         len += 4 + 4 +
 288                                 optional_strlen(config->autoboot_opts[i].uuid);
 289         }
 290
 291         len += 4 + 4; /* ipmi_bootdev, ipmi_bootdev_persistent */
 292
 293         len += 4 + optional_strlen(config->lang);
 294
 295         return len;
 296 }
 297
 298 int pb_protocol_url_len(const char *url)
 299 {
 300         /* url + length field */
 301         return 4 + optional_strlen(url);
 302 }
 303
 304 int pb_protocol_serialise_device(const struct device *dev,
 305                 char *buf, int buf_len)
 306 {
 307         char *pos = buf;
 308
 309         pos += pb_protocol_serialise_string(pos, dev->id);
 310         *(enum device_type *)pos = dev->type;
 311         pos += sizeof(enum device_type);
 312         pos += pb_protocol_serialise_string(pos, dev->name);
 313         pos += pb_protocol_serialise_string(pos, dev->description);
 314         pos += pb_protocol_serialise_string(pos, dev->icon_file);
 315
 316         assert(pos <= buf + buf_len);
 317         (void)buf_len;
 318
 319         return 0;
 320 }
 321
 322 int pb_protocol_serialise_boot_option(const struct boot_option *opt,
 323                 char *buf, int buf_len)
 324 {
 325         char *pos = buf;
 326
 327         pos += pb_protocol_serialise_string(pos, opt->device_id);
 328         pos += pb_protocol_serialise_string(pos, opt->id);
 329         pos += pb_protocol_serialise_string(pos, opt->name);
 330         pos += pb_protocol_serialise_string(pos, opt->description);
 331         pos += pb_protocol_serialise_string(pos, opt->icon_file);
 332         pos += pb_protocol_serialise_string(pos, opt->boot_image_file);
 333         pos += pb_protocol_serialise_string(pos, opt->initrd_file);
 334         pos += pb_protocol_serialise_string(pos, opt->dtb_file);
 335         pos += pb_protocol_serialise_string(pos, opt->boot_args);
 336
 337         *(bool *)pos = opt->is_default;
 338         pos += sizeof(bool);
 339
 340         assert(pos <= buf + buf_len);
 341         (void)buf_len;
 342
 343         return 0;
 344 }
 345
 346 int pb_protocol_serialise_boot_command(const struct boot_command *boot,
 347                 char *buf, int buf_len)
 348 {
 349         char *pos = buf;
 350
 351         pos += pb_protocol_serialise_string(pos, boot->option_id);
 352         pos += pb_protocol_serialise_string(pos, boot->boot_image_file);
 353         pos += pb_protocol_serialise_string(pos, boot->initrd_file);
 354         pos += pb_protocol_serialise_string(pos, boot->dtb_file);
 355         pos += pb_protocol_serialise_string(pos, boot->boot_args);
 356
 357         assert(pos <= buf + buf_len);
 358         (void)buf_len;
 359
 360         return 0;
 361 }
 362
 363 int pb_protocol_serialise_boot_status(const struct boot_status *status,
 364                 char *buf, int buf_len)
 365 {
 366         char *pos = buf;
 367
 368         *(uint32_t *)pos = __cpu_to_be32(status->type);
 369         pos += sizeof(uint32_t);
 370
 371         pos += pb_protocol_serialise_string(pos, status->message);
 372         pos += pb_protocol_serialise_string(pos, status->detail);
 373
 374         *(uint32_t *)pos = __cpu_to_be32(status->type);
 375         pos += sizeof(uint32_t);
 376
 377         assert(pos <= buf + buf_len);
 378         (void)buf_len;
 379
 380         return 0;
 381 }
 382
 383 int pb_protocol_serialise_system_info(const struct system_info *sysinfo,
 384                 char *buf, int buf_len)
 385 {
 386         char *pos = buf;
 387         unsigned int i;
 388
 389         pos += pb_protocol_serialise_string(pos, sysinfo->type);
 390         pos += pb_protocol_serialise_string(pos, sysinfo->identifier);
 391
 392         *(uint32_t *)pos = __cpu_to_be32(sysinfo->n_interfaces);
 393         pos += sizeof(uint32_t);
 394
 395         for (i = 0; i < sysinfo->n_interfaces; i++) {
 396                 struct interface_info *if_info = sysinfo->interfaces[i];
 397
 398                 *(uint32_t *)pos = __cpu_to_be32(if_info->hwaddr_size);
 399                 pos += sizeof(uint32_t);
 400
 401                 memcpy(pos, if_info->hwaddr, if_info->hwaddr_size);
 402                 pos += if_info->hwaddr_size;
 403
 404                 pos += pb_protocol_serialise_string(pos, if_info->name);
 405
 406                 *(bool *)pos = if_info->link;
 407                 pos += sizeof(bool);
 408         }
 409
 410         *(uint32_t *)pos = __cpu_to_be32(sysinfo->n_blockdevs);
 411         pos += sizeof(uint32_t);
 412
 413         for (i = 0; i < sysinfo->n_blockdevs; i++) {
 414                 struct blockdev_info *bd_info = sysinfo->blockdevs[i];
 415
 416                 pos += pb_protocol_serialise_string(pos, bd_info->name);
 417                 pos += pb_protocol_serialise_string(pos, bd_info->uuid);
 418                 pos += pb_protocol_serialise_string(pos, bd_info->mountpoint);
 419         }
 420
 421         assert(pos <= buf + buf_len);
 422         (void)buf_len;
 423
 424         return 0;
 425 }
 426
 427 static int pb_protocol_serialise_config_interface(char *buf,
 428                 struct interface_config *conf)
 429 {
 430         char *pos = buf;
 431
 432         memcpy(pos, conf->hwaddr, sizeof(conf->hwaddr));
 433         pos += sizeof(conf->hwaddr);
 434
 435         *(uint32_t *)pos = conf->ignore;
 436         pos += 4;
 437
 438         if (conf->ignore)
 439                 return pos - buf;
 440
 441         *(uint32_t *)pos = __cpu_to_be32(conf->method);
 442         pos += 4;
 443
 444         if (conf->method == CONFIG_METHOD_STATIC) {
 445                 pos += pb_protocol_serialise_string(pos,
 446                                 conf->static_config.address);
 447                 pos += pb_protocol_serialise_string(pos,
 448                                 conf->static_config.gateway);
 449         }
 450
 451         return pos - buf;
 452 }
 453
 454 int pb_protocol_serialise_config(const struct config *config,
 455                 char *buf, int buf_len)
 456 {
 457         char *pos = buf;
 458         unsigned int i;
 459
 460         *(uint32_t *)pos = config->autoboot_enabled;
 461         pos += 4;
 462
 463         *(uint32_t *)pos = __cpu_to_be32(config->autoboot_timeout_sec);
 464         pos += 4;
 465
 466         *(uint32_t *)pos = config->safe_mode;
 467         pos += 4;
 468
 469         *(uint32_t *)pos = __cpu_to_be32(config->network.n_interfaces);
 470         pos += 4;
 471         for (i = 0; i < config->network.n_interfaces; i++) {
 472                 struct interface_config *iface =
 473                         config->network.interfaces[i];
 474                 pos += pb_protocol_serialise_config_interface(pos, iface);
 475         }
 476
 477         *(uint32_t *)pos = __cpu_to_be32(config->network.n_dns_servers);
 478         pos += 4;
 479         for (i = 0; i < config->network.n_dns_servers; i++) {
 480                 pos += pb_protocol_serialise_string(pos,
 481                                 config->network.dns_servers[i]);
 482         }
 483
 484         *(uint32_t *)pos = __cpu_to_be32(config->n_autoboot_opts);
 485         pos += 4;
 486         for (i = 0; i < config->n_autoboot_opts; i++) {
 487                 *(uint32_t *)pos =
 488                         __cpu_to_be32(config->autoboot_opts[i].boot_type);
 489                 pos += 4;
 490                 if (config->autoboot_opts[i].boot_type == BOOT_DEVICE_TYPE) {
 491                         *(uint32_t *)pos =
 492                                 __cpu_to_be32(config->autoboot_opts[i].type);
 493                         pos += 4;
 494                 } else {
 495                         pos += pb_protocol_serialise_string(pos,
 496                                                 config->autoboot_opts[i].uuid);
 497                 }
 498         }
 499
 500         *(uint32_t *)pos = __cpu_to_be32(config->ipmi_bootdev);
 501         pos += 4;
 502         *(uint32_t *)pos = config->ipmi_bootdev_persistent;
 503         pos += 4;
 504
 505         pos += pb_protocol_serialise_string(pos, config->lang);
 506
 507         assert(pos <= buf + buf_len);
 508         (void)buf_len;
 509
 510         return 0;
 511 }
 512
 513 int pb_protocol_serialise_url(const char *url, char *buf, int buf_len)
 514 {
 515         char *pos = buf;
 516
 517         pos += pb_protocol_serialise_string(pos, url);
 518
 519         assert(pos <=buf+buf_len);
 520         (void)buf_len;
 521
 522         return 0;
 523 }
 524
 525 int pb_protocol_write_message(int fd, struct pb_protocol_message *message)
 526 {
 527         int total_len, rc;
 528         char *pos;
 529
 530         total_len = sizeof(*message) + message->payload_len;
 531
 532         message->payload_len = __cpu_to_be32(message->payload_len);
 533         message->action = __cpu_to_be32(message->action);
 534
 535         for (pos = (void *)message; total_len;) {
 536                 rc = write(fd, pos, total_len);
 537
 538                 if (rc <= 0)
 539                         break;
 540
 541                 total_len -= rc;
 542                 pos += rc;
 543         }
 544
 545         talloc_free(message);
 546
 547         if (!total_len)
 548                 return 0;
 549
 550         pb_log("%s: failed: %s\n", __func__, strerror(errno));
 551         return -1;
 552 }
 553
 554 struct pb_protocol_message *pb_protocol_create_message(void *ctx,
 555                 enum pb_protocol_action action, int payload_len)
 556 {
 557         struct pb_protocol_message *message;
 558
 559         if (payload_len > PB_PROTOCOL_MAX_PAYLOAD_SIZE) {
 560                 pb_log("%s: payload too big %u/%u\n", __func__, payload_len,
 561                         PB_PROTOCOL_MAX_PAYLOAD_SIZE);
 562                 return NULL;
 563         }
 564
 565         message = talloc_size(ctx, sizeof(*message) + payload_len);
 566
 567         /* we convert these to big-endian in write_message() */
 568         message->action = action;
 569         message->payload_len = payload_len;
 570
 571         return message;
 572
 573 }
 574
 575 struct pb_protocol_message *pb_protocol_read_message(void *ctx, int fd)
 576 {
 577         struct pb_protocol_message *message, m;
 578         int rc;
 579         unsigned int len;
 580
 581         /* use the stack for the initial 8-byte read */
 582
 583         rc = read(fd, &m, sizeof(m));
 584         if (rc != sizeof(m))
 585                 return NULL;
 586
 587         m.payload_len = __be32_to_cpu(m.payload_len);
 588         m.action = __be32_to_cpu(m.action);
 589
 590         if (m.payload_len > PB_PROTOCOL_MAX_PAYLOAD_SIZE) {
 591                 pb_log("%s: payload too big %u/%u\n", __func__, m.payload_len,
 592                         PB_PROTOCOL_MAX_PAYLOAD_SIZE);
 593                 return NULL;
 594         }
 595
 596         message = talloc_size(ctx, sizeof(m) + m.payload_len);
 597         memcpy(message, &m, sizeof(m));
 598
 599         for (len = 0; len < m.payload_len;) {
 600                 rc = read(fd, message->payload + len, m.payload_len - len);
 601
 602                 if (rc <= 0) {
 603                         talloc_free(message);
 604                         pb_log("%s: failed (%u): %s\n", __func__, len,
 605                                 strerror(errno));
 606                         return NULL;
 607                 }
 608
 609                 len += rc;
 610         }
 611
 612         return message;
 613 }
 614
 615
 616 int pb_protocol_deserialise_device(struct device *dev,
 617                 const struct pb_protocol_message *message)
 618 {
 619         unsigned int len;
 620         const char *pos;
 621         int rc = -1;
 622
 623         len = message->payload_len;
 624         pos = message->payload;
 625
 626         if (read_string(dev, &pos, &len, &dev->id))
 627                 goto out;
 628
 629         if (len < sizeof(enum device_type))
 630                 goto out;
 631         dev->type = *(enum device_type *)(pos);
 632         pos += sizeof(enum device_type);
 633         len -= sizeof(enum device_type);
 634
 635         if (read_string(dev, &pos, &len, &dev->name))
 636                 goto out;
 637
 638         if (read_string(dev, &pos, &len, &dev->description))
 639                 goto out;
 640
 641         if (read_string(dev, &pos, &len, &dev->icon_file))
 642                 goto out;
 643
 644         rc = 0;
 645
 646 out:
 647         return rc;
 648 }
 649
 650 int pb_protocol_deserialise_boot_option(struct boot_option *opt,
 651                 const struct pb_protocol_message *message)
 652 {
 653         unsigned int len;
 654         const char *pos;
 655         int rc = -1;
 656
 657         len = message->payload_len;
 658         pos = message->payload;
 659
 660         if (read_string(opt, &pos, &len, &opt->device_id))
 661                 goto out;
 662
 663         if (read_string(opt, &pos, &len, &opt->id))
 664                 goto out;
 665
 666         if (read_string(opt, &pos, &len, &opt->name))
 667                 goto out;
 668
 669         if (read_string(opt, &pos, &len, &opt->description))
 670                 goto out;
 671
 672         if (read_string(opt, &pos, &len, &opt->icon_file))
 673                 goto out;
 674
 675         if (read_string(opt, &pos, &len, &opt->boot_image_file))
 676                 goto out;
 677
 678         if (read_string(opt, &pos, &len, &opt->initrd_file))
 679                 goto out;
 680
 681         if (read_string(opt, &pos, &len, &opt->dtb_file))
 682                 goto out;
 683
 684         if (read_string(opt, &pos, &len, &opt->boot_args))
 685                 goto out;
 686
 687         if (len < sizeof(bool))
 688                 goto out;
 689         opt->is_default = *(bool *)(pos);
 690
 691         rc = 0;
 692
 693 out:
 694         return rc;
 695 }
 696
 697 int pb_protocol_deserialise_boot_command(struct boot_command *cmd,
 698                 const struct pb_protocol_message *message)
 699 {
 700         unsigned int len;
 701         const char *pos;
 702         int rc = -1;
 703
 704         len = message->payload_len;
 705         pos = message->payload;
 706
 707         if (read_string(cmd, &pos, &len, &cmd->option_id))
 708                 goto out;
 709
 710         if (read_string(cmd, &pos, &len, &cmd->boot_image_file))
 711                 goto out;
 712
 713         if (read_string(cmd, &pos, &len, &cmd->initrd_file))
 714                 goto out;
 715
 716         if (read_string(cmd, &pos, &len, &cmd->dtb_file))
 717                 goto out;
 718
 719         if (read_string(cmd, &pos, &len, &cmd->boot_args))
 720                 goto out;
 721
 722         rc = 0;
 723
 724 out:
 725         return rc;
 726 }
 727
 728 int pb_protocol_deserialise_boot_status(struct boot_status *status,
 729                 const struct pb_protocol_message *message)
 730 {
 731         unsigned int len;
 732         const char *pos;
 733         int rc = -1;
 734
 735         len = message->payload_len;
 736         pos = message->payload;
 737
 738         /* first up, the type enum... */
 739         if (len < sizeof(uint32_t))
 740                 goto out;
 741
 742         status->type = __be32_to_cpu(*(uint32_t *)(pos));
 743
 744         switch (status->type) {
 745         case BOOT_STATUS_ERROR:
 746         case BOOT_STATUS_INFO:
 747                 break;
 748         default:
 749                 goto out;
 750         }
 751
 752         pos += sizeof(uint32_t);
 753         len -= sizeof(uint32_t);
 754
 755         /* message and detail strings */
 756         if (read_string(status, &pos, &len, &status->message))
 757                 goto out;
 758
 759         if (read_string(status, &pos, &len, &status->detail))
 760                 goto out;
 761
 762         /* and finally, progress */
 763         if (len < sizeof(uint32_t))
 764                 goto out;
 765
 766         status->progress = __be32_to_cpu(*(uint32_t *)(pos));
 767
 768         /* clamp to 100% */
 769         if (status->progress > 100)
 770                 status->progress = 100;
 771
 772         rc = 0;
 773
 774 out:
 775         return rc;
 776 }
 777
 778 int pb_protocol_deserialise_system_info(struct system_info *sysinfo,
 779                 const struct pb_protocol_message *message)
 780 {
 781         unsigned int len, i;
 782         const char *pos;
 783         int rc = -1;
 784
 785         len = message->payload_len;
 786         pos = message->payload;
 787
 788         /* type and identifier strings */
 789         if (read_string(sysinfo, &pos, &len, &sysinfo->type))
 790                 goto out;
 791
 792         if (read_string(sysinfo, &pos, &len, &sysinfo->identifier))
 793                 goto out;
 794
 795         /* number of interfaces */
 796         if (read_u32(&pos, &len, &sysinfo->n_interfaces))
 797                 goto out;
 798
 799         sysinfo->interfaces = talloc_array(sysinfo, struct interface_info *,
 800                         sysinfo->n_interfaces);
 801
 802         for (i = 0; i < sysinfo->n_interfaces; i++) {
 803                 struct interface_info *if_info = talloc(sysinfo,
 804                                                         struct interface_info);
 805
 806                 if (read_u32(&pos, &len, &if_info->hwaddr_size))
 807                         goto out;
 808
 809                 if (len < if_info->hwaddr_size)
 810                         goto out;
 811
 812                 if_info->hwaddr = talloc_memdup(if_info, pos,
 813                                                 if_info->hwaddr_size);
 814                 pos += if_info->hwaddr_size;
 815                 len -= if_info->hwaddr_size;
 816
 817                 if (read_string(if_info, &pos, &len, &if_info->name))
 818                         goto out;
 819
 820                 if_info->link = *(bool *)pos;
 821                 pos += sizeof(if_info->link);
 822
 823                 sysinfo->interfaces[i] = if_info;
 824         }
 825
 826         /* number of interfaces */
 827         if (read_u32(&pos, &len, &sysinfo->n_blockdevs))
 828                 goto out;
 829
 830         sysinfo->blockdevs = talloc_array(sysinfo, struct blockdev_info *,
 831                         sysinfo->n_blockdevs);
 832
 833         for (i = 0; i < sysinfo->n_blockdevs; i++) {
 834                 struct blockdev_info *bd_info = talloc(sysinfo,
 835                                                         struct blockdev_info);
 836
 837                 if (read_string(bd_info, &pos, &len, &bd_info->name))
 838                         goto out;
 839
 840                 if (read_string(bd_info, &pos, &len, &bd_info->uuid))
 841                         goto out;
 842
 843                 if (read_string(bd_info, &pos, &len, &bd_info->mountpoint))
 844                         goto out;
 845
 846                 sysinfo->blockdevs[i] = bd_info;
 847         }
 848         rc = 0;
 849
 850 out:
 851         return rc;
 852 }
 853
 854 static int pb_protocol_deserialise_config_interface(const char **buf,
 855                 unsigned int *len, struct interface_config *iface)
 856 {
 857         unsigned int tmp;
 858
 859         if (*len < sizeof(iface->hwaddr))
 860                 return -1;
 861
 862         memcpy(iface->hwaddr, *buf, sizeof(iface->hwaddr));
 863         *buf += sizeof(iface->hwaddr);
 864         *len -= sizeof(iface->hwaddr);
 865
 866         if (read_u32(buf, len, &tmp))
 867                 return -1;
 868         iface->ignore = !!tmp;
 869
 870         if (iface->ignore)
 871                 return 0;
 872
 873         if (read_u32(buf, len, &iface->method))
 874                 return -1;
 875
 876         if (iface->method == CONFIG_METHOD_STATIC) {
 877                 if (read_string(iface, buf, len, &iface->static_config.address))
 878                         return -1;
 879
 880                 if (read_string(iface, buf, len, &iface->static_config.gateway))
 881                         return -1;
 882         }
 883
 884         return 0;
 885 }
 886
 887 int pb_protocol_deserialise_config(struct config *config,
 888                 const struct pb_protocol_message *message)
 889 {
 890         unsigned int len, i, tmp;
 891         const char *pos;
 892         int rc = -1;
 893         char *str;
 894
 895         len = message->payload_len;
 896         pos = message->payload;
 897
 898         if (read_u32(&pos, &len, &tmp))
 899                 goto out;
 900         config->autoboot_enabled = !!tmp;
 901
 902         if (read_u32(&pos, &len, &config->autoboot_timeout_sec))
 903                 goto out;
 904
 905         if (read_u32(&pos, &len, &tmp))
 906                 goto out;
 907         config->safe_mode = !!tmp;
 908
 909         if (read_u32(&pos, &len, &config->network.n_interfaces))
 910                 goto out;
 911
 912         config->network.interfaces = talloc_array(config,
 913                         struct interface_config *, config->network.n_interfaces);
 914
 915         for (i = 0; i < config->network.n_interfaces; i++) {
 916                 struct interface_config *iface = talloc_zero(
 917                                 config->network.interfaces,
 918                                 struct interface_config);
 919                 if (pb_protocol_deserialise_config_interface(&pos, &len, iface))
 920                         goto out;
 921                 config->network.interfaces[i] = iface;
 922         }
 923
 924         if (read_u32(&pos, &len, &config->network.n_dns_servers))
 925                 goto out;
 926         config->network.dns_servers = talloc_array(config, const char *,
 927                         config->network.n_dns_servers);
 928
 929         for (i = 0; i < config->network.n_dns_servers; i++) {
 930                 if (read_string(config->network.dns_servers, &pos, &len, &str))
 931                         goto out;
 932                 config->network.dns_servers[i] = str;
 933         }
 934
 935         if (read_u32(&pos, &len, &config->n_autoboot_opts))
 936                 goto out;
 937         config->autoboot_opts = talloc_array(config, struct autoboot_option,
 938                         config->n_autoboot_opts);
 939
 940         for (i = 0; i < config->n_autoboot_opts; i++) {
 941                 if (read_u32(&pos, &len, &tmp))
 942                         goto out;
 943                 config->autoboot_opts[i].boot_type = (int)tmp;
 944                 if (config->autoboot_opts[i].boot_type == BOOT_DEVICE_TYPE) {
 945                         if (read_u32(&pos, &len, &tmp))
 946                                 goto out;
 947                         config->autoboot_opts[i].type = tmp;
 948                 } else {
 949                         if (read_string(config, &pos, &len, &str))
 950                                 goto out;
 951                         config->autoboot_opts[i].uuid = str;
 952                 }
 953         }
 954
 955         if (read_u32(&pos, &len, &config->ipmi_bootdev))
 956                 goto out;
 957         if (read_u32(&pos, &len, &tmp))
 958                 goto out;
 959         config->ipmi_bootdev_persistent = !!tmp;
 960
 961         if (read_string(config, &pos, &len, &str))
 962                 goto out;
 963
 964         config->lang = str;
 965
 966         rc = 0;
 967
 968 out:
 969         return rc;
 970 }