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         }
 233
 234         for (i = 0; i < sysinfo->n_blockdevs; i++) {
 235                 struct blockdev_info *bd_info = sysinfo->blockdevs[i];
 236                 len +=  4 + optional_strlen(bd_info->name) +
 237                         4 + optional_strlen(bd_info->uuid) +
 238                         4 + optional_strlen(bd_info->mountpoint);
 239         }
 240
 241         return len;
 242 }
 243
 244 static int pb_protocol_interface_config_len(struct interface_config *conf)
 245 {
 246         unsigned int len;
 247
 248         len =   sizeof(conf->hwaddr) +
 249                 4 /* conf->ignore */;
 250
 251         if (conf->ignore)
 252                 return len;
 253
 254         len += 4 /* conf->method */;
 255
 256         if (conf->method == CONFIG_METHOD_STATIC) {
 257                 len += 4 + optional_strlen(conf->static_config.address);
 258                 len += 4 + optional_strlen(conf->static_config.gateway);
 259         }
 260
 261         return len;
 262 }
 263
 264 int pb_protocol_config_len(const struct config *config)
 265 {
 266         unsigned int i, len;
 267
 268         len =   4 /* config->autoboot_enabled */ +
 269                 4 /* config->autoboot_timeout_sec */;
 270
 271         len += 4;
 272         for (i = 0; i < config->network.n_interfaces; i++)
 273                 len += pb_protocol_interface_config_len(
 274                                 config->network.interfaces[i]);
 275
 276         len += 4;
 277         for (i = 0; i < config->network.n_dns_servers; i++)
 278                 len += 4 + optional_strlen(config->network.dns_servers[i]);
 279
 280         len += 4;
 281         len += config->n_boot_priorities * 4;
 282
 283         return len;
 284 }
 285
 286 int pb_protocol_serialise_device(const struct device *dev,
 287                 char *buf, int buf_len)
 288 {
 289         char *pos = buf;
 290
 291         pos += pb_protocol_serialise_string(pos, dev->id);
 292         *(enum device_type *)pos = dev->type;
 293         pos += sizeof(enum device_type);
 294         pos += pb_protocol_serialise_string(pos, dev->name);
 295         pos += pb_protocol_serialise_string(pos, dev->description);
 296         pos += pb_protocol_serialise_string(pos, dev->icon_file);
 297
 298         assert(pos <= buf + buf_len);
 299         (void)buf_len;
 300
 301         return 0;
 302 }
 303
 304 int pb_protocol_serialise_boot_option(const struct boot_option *opt,
 305                 char *buf, int buf_len)
 306 {
 307         char *pos = buf;
 308
 309         pos += pb_protocol_serialise_string(pos, opt->device_id);
 310         pos += pb_protocol_serialise_string(pos, opt->id);
 311         pos += pb_protocol_serialise_string(pos, opt->name);
 312         pos += pb_protocol_serialise_string(pos, opt->description);
 313         pos += pb_protocol_serialise_string(pos, opt->icon_file);
 314         pos += pb_protocol_serialise_string(pos, opt->boot_image_file);
 315         pos += pb_protocol_serialise_string(pos, opt->initrd_file);
 316         pos += pb_protocol_serialise_string(pos, opt->dtb_file);
 317         pos += pb_protocol_serialise_string(pos, opt->boot_args);
 318
 319         *(bool *)pos = opt->is_default;
 320         pos += sizeof(bool);
 321
 322         assert(pos <= buf + buf_len);
 323         (void)buf_len;
 324
 325         return 0;
 326 }
 327
 328 int pb_protocol_serialise_boot_command(const struct boot_command *boot,
 329                 char *buf, int buf_len)
 330 {
 331         char *pos = buf;
 332
 333         pos += pb_protocol_serialise_string(pos, boot->option_id);
 334         pos += pb_protocol_serialise_string(pos, boot->boot_image_file);
 335         pos += pb_protocol_serialise_string(pos, boot->initrd_file);
 336         pos += pb_protocol_serialise_string(pos, boot->dtb_file);
 337         pos += pb_protocol_serialise_string(pos, boot->boot_args);
 338
 339         assert(pos <= buf + buf_len);
 340         (void)buf_len;
 341
 342         return 0;
 343 }
 344
 345 int pb_protocol_serialise_boot_status(const struct boot_status *status,
 346                 char *buf, int buf_len)
 347 {
 348         char *pos = buf;
 349
 350         *(uint32_t *)pos = __cpu_to_be32(status->type);
 351         pos += sizeof(uint32_t);
 352
 353         pos += pb_protocol_serialise_string(pos, status->message);
 354         pos += pb_protocol_serialise_string(pos, status->detail);
 355
 356         *(uint32_t *)pos = __cpu_to_be32(status->type);
 357         pos += sizeof(uint32_t);
 358
 359         assert(pos <= buf + buf_len);
 360         (void)buf_len;
 361
 362         return 0;
 363 }
 364
 365 int pb_protocol_serialise_system_info(const struct system_info *sysinfo,
 366                 char *buf, int buf_len)
 367 {
 368         char *pos = buf;
 369         unsigned int i;
 370
 371         pos += pb_protocol_serialise_string(pos, sysinfo->type);
 372         pos += pb_protocol_serialise_string(pos, sysinfo->identifier);
 373
 374         *(uint32_t *)pos = __cpu_to_be32(sysinfo->n_interfaces);
 375         pos += sizeof(uint32_t);
 376
 377         for (i = 0; i < sysinfo->n_interfaces; i++) {
 378                 struct interface_info *if_info = sysinfo->interfaces[i];
 379
 380                 *(uint32_t *)pos = __cpu_to_be32(if_info->hwaddr_size);
 381                 pos += sizeof(uint32_t);
 382
 383                 memcpy(pos, if_info->hwaddr, if_info->hwaddr_size);
 384                 pos += if_info->hwaddr_size;
 385
 386                 pos += pb_protocol_serialise_string(pos, if_info->name);
 387         }
 388
 389         *(uint32_t *)pos = __cpu_to_be32(sysinfo->n_blockdevs);
 390         pos += sizeof(uint32_t);
 391
 392         for (i = 0; i < sysinfo->n_blockdevs; i++) {
 393                 struct blockdev_info *bd_info = sysinfo->blockdevs[i];
 394
 395                 pos += pb_protocol_serialise_string(pos, bd_info->name);
 396                 pos += pb_protocol_serialise_string(pos, bd_info->uuid);
 397                 pos += pb_protocol_serialise_string(pos, bd_info->mountpoint);
 398         }
 399
 400         assert(pos <= buf + buf_len);
 401         (void)buf_len;
 402
 403         return 0;
 404 }
 405
 406 static int pb_protocol_serialise_config_interface(char *buf,
 407                 struct interface_config *conf)
 408 {
 409         char *pos = buf;
 410
 411         memcpy(pos, conf->hwaddr, sizeof(conf->hwaddr));
 412         pos += sizeof(conf->hwaddr);
 413
 414         *(uint32_t *)pos = conf->ignore;
 415         pos += 4;
 416
 417         if (conf->ignore)
 418                 return pos - buf;
 419
 420         *(uint32_t *)pos = __cpu_to_be32(conf->method);
 421         pos += 4;
 422
 423         if (conf->method == CONFIG_METHOD_STATIC) {
 424                 pos += pb_protocol_serialise_string(pos,
 425                                 conf->static_config.address);
 426                 pos += pb_protocol_serialise_string(pos,
 427                                 conf->static_config.gateway);
 428         }
 429
 430         return pos - buf;
 431 }
 432
 433 int pb_protocol_serialise_config(const struct config *config,
 434                 char *buf, int buf_len)
 435 {
 436         char *pos = buf;
 437         unsigned int i;
 438
 439         *(uint32_t *)pos = config->autoboot_enabled;
 440         pos += 4;
 441
 442         *(uint32_t *)pos = __cpu_to_be32(config->autoboot_timeout_sec);
 443         pos += 4;
 444
 445         *(uint32_t *)pos = __cpu_to_be32(config->network.n_interfaces);
 446         pos += 4;
 447         for (i = 0; i < config->network.n_interfaces; i++) {
 448                 struct interface_config *iface =
 449                         config->network.interfaces[i];
 450                 pos += pb_protocol_serialise_config_interface(pos, iface);
 451         }
 452
 453         *(uint32_t *)pos = __cpu_to_be32(config->network.n_dns_servers);
 454         pos += 4;
 455         for (i = 0; i < config->network.n_dns_servers; i++) {
 456                 pos += pb_protocol_serialise_string(pos,
 457                                 config->network.dns_servers[i]);
 458         }
 459
 460         *(uint32_t *)pos = __cpu_to_be32(config->n_boot_priorities);
 461         pos += 4;
 462         for (i = 0; i < config->n_boot_priorities; i++) {
 463                 *(uint32_t *)pos = __cpu_to_be32(config->boot_priorities[i].type);
 464                 pos += 4;
 465         }
 466
 467         assert(pos <= buf + buf_len);
 468         (void)buf_len;
 469
 470         return 0;
 471 }
 472
 473 int pb_protocol_write_message(int fd, struct pb_protocol_message *message)
 474 {
 475         int total_len, rc;
 476         char *pos;
 477
 478         total_len = sizeof(*message) + message->payload_len;
 479
 480         message->payload_len = __cpu_to_be32(message->payload_len);
 481         message->action = __cpu_to_be32(message->action);
 482
 483         for (pos = (void *)message; total_len;) {
 484                 rc = write(fd, pos, total_len);
 485
 486                 if (rc <= 0)
 487                         break;
 488
 489                 total_len -= rc;
 490                 pos += rc;
 491         }
 492
 493         talloc_free(message);
 494
 495         if (!total_len)
 496                 return 0;
 497
 498         pb_log("%s: failed: %s\n", __func__, strerror(errno));
 499         return -1;
 500 }
 501
 502 struct pb_protocol_message *pb_protocol_create_message(void *ctx,
 503                 enum pb_protocol_action action, int payload_len)
 504 {
 505         struct pb_protocol_message *message;
 506
 507         if (payload_len > PB_PROTOCOL_MAX_PAYLOAD_SIZE) {
 508                 pb_log("%s: payload too big %u/%u\n", __func__, payload_len,
 509                         PB_PROTOCOL_MAX_PAYLOAD_SIZE);
 510                 return NULL;
 511         }
 512
 513         message = talloc_size(ctx, sizeof(*message) + payload_len);
 514
 515         /* we convert these to big-endian in write_message() */
 516         message->action = action;
 517         message->payload_len = payload_len;
 518
 519         return message;
 520
 521 }
 522
 523 struct pb_protocol_message *pb_protocol_read_message(void *ctx, int fd)
 524 {
 525         struct pb_protocol_message *message, m;
 526         int rc;
 527         unsigned int len;
 528
 529         /* use the stack for the initial 8-byte read */
 530
 531         rc = read(fd, &m, sizeof(m));
 532         if (rc != sizeof(m))
 533                 return NULL;
 534
 535         m.payload_len = __be32_to_cpu(m.payload_len);
 536         m.action = __be32_to_cpu(m.action);
 537
 538         if (m.payload_len > PB_PROTOCOL_MAX_PAYLOAD_SIZE) {
 539                 pb_log("%s: payload too big %u/%u\n", __func__, m.payload_len,
 540                         PB_PROTOCOL_MAX_PAYLOAD_SIZE);
 541                 return NULL;
 542         }
 543
 544         message = talloc_size(ctx, sizeof(m) + m.payload_len);
 545         memcpy(message, &m, sizeof(m));
 546
 547         for (len = 0; len < m.payload_len;) {
 548                 rc = read(fd, message->payload + len, m.payload_len - len);
 549
 550                 if (rc <= 0) {
 551                         talloc_free(message);
 552                         pb_log("%s: failed (%u): %s\n", __func__, len,
 553                                 strerror(errno));
 554                         return NULL;
 555                 }
 556
 557                 len += rc;
 558         }
 559
 560         return message;
 561 }
 562
 563
 564 int pb_protocol_deserialise_device(struct device *dev,
 565                 const struct pb_protocol_message *message)
 566 {
 567         unsigned int len;
 568         const char *pos;
 569         int rc = -1;
 570
 571         len = message->payload_len;
 572         pos = message->payload;
 573
 574         if (read_string(dev, &pos, &len, &dev->id))
 575                 goto out;
 576
 577         if (len < sizeof(enum device_type))
 578                 goto out;
 579         dev->type = *(enum device_type *)(pos);
 580         pos += sizeof(enum device_type);
 581         len -= sizeof(enum device_type);
 582
 583         if (read_string(dev, &pos, &len, &dev->name))
 584                 goto out;
 585
 586         if (read_string(dev, &pos, &len, &dev->description))
 587                 goto out;
 588
 589         if (read_string(dev, &pos, &len, &dev->icon_file))
 590                 goto out;
 591
 592         rc = 0;
 593
 594 out:
 595         return rc;
 596 }
 597
 598 int pb_protocol_deserialise_boot_option(struct boot_option *opt,
 599                 const struct pb_protocol_message *message)
 600 {
 601         unsigned int len;
 602         const char *pos;
 603         int rc = -1;
 604
 605         len = message->payload_len;
 606         pos = message->payload;
 607
 608         if (read_string(opt, &pos, &len, &opt->device_id))
 609                 goto out;
 610
 611         if (read_string(opt, &pos, &len, &opt->id))
 612                 goto out;
 613
 614         if (read_string(opt, &pos, &len, &opt->name))
 615                 goto out;
 616
 617         if (read_string(opt, &pos, &len, &opt->description))
 618                 goto out;
 619
 620         if (read_string(opt, &pos, &len, &opt->icon_file))
 621                 goto out;
 622
 623         if (read_string(opt, &pos, &len, &opt->boot_image_file))
 624                 goto out;
 625
 626         if (read_string(opt, &pos, &len, &opt->initrd_file))
 627                 goto out;
 628
 629         if (read_string(opt, &pos, &len, &opt->dtb_file))
 630                 goto out;
 631
 632         if (read_string(opt, &pos, &len, &opt->boot_args))
 633                 goto out;
 634
 635         if (len < sizeof(bool))
 636                 goto out;
 637         opt->is_default = *(bool *)(pos);
 638
 639         rc = 0;
 640
 641 out:
 642         return rc;
 643 }
 644
 645 int pb_protocol_deserialise_boot_command(struct boot_command *cmd,
 646                 const struct pb_protocol_message *message)
 647 {
 648         unsigned int len;
 649         const char *pos;
 650         int rc = -1;
 651
 652         len = message->payload_len;
 653         pos = message->payload;
 654
 655         if (read_string(cmd, &pos, &len, &cmd->option_id))
 656                 goto out;
 657
 658         if (read_string(cmd, &pos, &len, &cmd->boot_image_file))
 659                 goto out;
 660
 661         if (read_string(cmd, &pos, &len, &cmd->initrd_file))
 662                 goto out;
 663
 664         if (read_string(cmd, &pos, &len, &cmd->dtb_file))
 665                 goto out;
 666
 667         if (read_string(cmd, &pos, &len, &cmd->boot_args))
 668                 goto out;
 669
 670         rc = 0;
 671
 672 out:
 673         return rc;
 674 }
 675
 676 int pb_protocol_deserialise_boot_status(struct boot_status *status,
 677                 const struct pb_protocol_message *message)
 678 {
 679         unsigned int len;
 680         const char *pos;
 681         int rc = -1;
 682
 683         len = message->payload_len;
 684         pos = message->payload;
 685
 686         /* first up, the type enum... */
 687         if (len < sizeof(uint32_t))
 688                 goto out;
 689
 690         status->type = __be32_to_cpu(*(uint32_t *)(pos));
 691
 692         switch (status->type) {
 693         case BOOT_STATUS_ERROR:
 694         case BOOT_STATUS_INFO:
 695                 break;
 696         default:
 697                 goto out;
 698         }
 699
 700         pos += sizeof(uint32_t);
 701         len -= sizeof(uint32_t);
 702
 703         /* message and detail strings */
 704         if (read_string(status, &pos, &len, &status->message))
 705                 goto out;
 706
 707         if (read_string(status, &pos, &len, &status->detail))
 708                 goto out;
 709
 710         /* and finally, progress */
 711         if (len < sizeof(uint32_t))
 712                 goto out;
 713
 714         status->progress = __be32_to_cpu(*(uint32_t *)(pos));
 715
 716         /* clamp to 100% */
 717         if (status->progress > 100)
 718                 status->progress = 100;
 719
 720         rc = 0;
 721
 722 out:
 723         return rc;
 724 }
 725
 726 int pb_protocol_deserialise_system_info(struct system_info *sysinfo,
 727                 const struct pb_protocol_message *message)
 728 {
 729         unsigned int len, i;
 730         const char *pos;
 731         int rc = -1;
 732
 733         len = message->payload_len;
 734         pos = message->payload;
 735
 736         /* type and identifier strings */
 737         if (read_string(sysinfo, &pos, &len, &sysinfo->type))
 738                 goto out;
 739
 740         if (read_string(sysinfo, &pos, &len, &sysinfo->identifier))
 741                 goto out;
 742
 743         /* number of interfaces */
 744         if (read_u32(&pos, &len, &sysinfo->n_interfaces))
 745                 goto out;
 746
 747         sysinfo->interfaces = talloc_array(sysinfo, struct interface_info *,
 748                         sysinfo->n_interfaces);
 749
 750         for (i = 0; i < sysinfo->n_interfaces; i++) {
 751                 struct interface_info *if_info = talloc(sysinfo,
 752                                                         struct interface_info);
 753
 754                 if (read_u32(&pos, &len, &if_info->hwaddr_size))
 755                         goto out;
 756
 757                 if (len < if_info->hwaddr_size)
 758                         goto out;
 759
 760                 if_info->hwaddr = talloc_memdup(if_info, pos,
 761                                                 if_info->hwaddr_size);
 762                 pos += if_info->hwaddr_size;
 763                 len -= if_info->hwaddr_size;
 764
 765                 if (read_string(if_info, &pos, &len, &if_info->name))
 766                         goto out;
 767
 768                 sysinfo->interfaces[i] = if_info;
 769         }
 770
 771         /* number of interfaces */
 772         if (read_u32(&pos, &len, &sysinfo->n_blockdevs))
 773                 goto out;
 774
 775         sysinfo->blockdevs = talloc_array(sysinfo, struct blockdev_info *,
 776                         sysinfo->n_blockdevs);
 777
 778         for (i = 0; i < sysinfo->n_blockdevs; i++) {
 779                 struct blockdev_info *bd_info = talloc(sysinfo,
 780                                                         struct blockdev_info);
 781
 782                 if (read_string(bd_info, &pos, &len, &bd_info->name))
 783                         goto out;
 784
 785                 if (read_string(bd_info, &pos, &len, &bd_info->uuid))
 786                         goto out;
 787
 788                 if (read_string(bd_info, &pos, &len, &bd_info->mountpoint))
 789                         goto out;
 790
 791                 sysinfo->blockdevs[i] = bd_info;
 792         }
 793         rc = 0;
 794
 795 out:
 796         return rc;
 797 }
 798
 799 static int pb_protocol_deserialise_config_interface(const char **buf,
 800                 unsigned int *len, struct interface_config *iface)
 801 {
 802         unsigned int tmp;
 803
 804         if (*len < sizeof(iface->hwaddr))
 805                 return -1;
 806
 807         memcpy(iface->hwaddr, *buf, sizeof(iface->hwaddr));
 808         *buf += sizeof(iface->hwaddr);
 809         *len -= sizeof(iface->hwaddr);
 810
 811         if (read_u32(buf, len, &tmp))
 812                 return -1;
 813         iface->ignore = !!tmp;
 814
 815         if (iface->ignore)
 816                 return 0;
 817
 818         if (read_u32(buf, len, &iface->method))
 819                 return -1;
 820
 821         if (iface->method == CONFIG_METHOD_STATIC) {
 822                 if (read_string(iface, buf, len, &iface->static_config.address))
 823                         return -1;
 824
 825                 if (read_string(iface, buf, len, &iface->static_config.gateway))
 826                         return -1;
 827         }
 828
 829         return 0;
 830 }
 831
 832 int pb_protocol_deserialise_config(struct config *config,
 833                 const struct pb_protocol_message *message)
 834 {
 835         unsigned int len, i, tmp;
 836         const char *pos;
 837         int rc = -1;
 838
 839         len = message->payload_len;
 840         pos = message->payload;
 841
 842         if (read_u32(&pos, &len, &tmp))
 843                 goto out;
 844         config->autoboot_enabled = !!tmp;
 845
 846         if (read_u32(&pos, &len, &config->autoboot_timeout_sec))
 847                 goto out;
 848
 849         if (read_u32(&pos, &len, &config->network.n_interfaces))
 850                 goto out;
 851
 852         config->network.interfaces = talloc_array(config,
 853                         struct interface_config *, config->network.n_interfaces);
 854
 855         for (i = 0; i < config->network.n_interfaces; i++) {
 856                 struct interface_config *iface = talloc_zero(
 857                                 config->network.interfaces,
 858                                 struct interface_config);
 859                 if (pb_protocol_deserialise_config_interface(&pos, &len, iface))
 860                         goto out;
 861                 config->network.interfaces[i] = iface;
 862         }
 863
 864         if (read_u32(&pos, &len, &config->network.n_dns_servers))
 865                 goto out;
 866         config->network.dns_servers = talloc_array(config, const char *,
 867                         config->network.n_dns_servers);
 868
 869         for (i = 0; i < config->network.n_dns_servers; i++) {
 870                 char *tmp;
 871                 if (read_string(config->network.dns_servers, &pos, &len, &tmp))
 872                         goto out;
 873                 config->network.dns_servers[i] = tmp;
 874         }
 875
 876         if (read_u32(&pos, &len, &config->n_boot_priorities))
 877                 goto out;
 878         config->boot_priorities = talloc_array(config, struct boot_priority,
 879                         config->n_boot_priorities);
 880
 881         for (i = 0; i < config->n_boot_priorities; i++) {
 882                 if (read_u32(&pos, &len, &tmp))
 883                         goto out;
 884                 config->boot_priorities[i].type = tmp;
 885         }
 886
 887         rc = 0;
 888
 889 out:
 890         return rc;
 891 }