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         len += config->n_boot_priorities * 8;
 284
 285         len += 4 + optional_strlen(config->boot_device);
 286
 287         len += 4 + optional_strlen(config->lang);
 288
 289         return len;
 290 }
 291
 292 int pb_protocol_serialise_device(const struct device *dev,
 293                 char *buf, int buf_len)
 294 {
 295         char *pos = buf;
 296
 297         pos += pb_protocol_serialise_string(pos, dev->id);
 298         *(enum device_type *)pos = dev->type;
 299         pos += sizeof(enum device_type);
 300         pos += pb_protocol_serialise_string(pos, dev->name);
 301         pos += pb_protocol_serialise_string(pos, dev->description);
 302         pos += pb_protocol_serialise_string(pos, dev->icon_file);
 303
 304         assert(pos <= buf + buf_len);
 305         (void)buf_len;
 306
 307         return 0;
 308 }
 309
 310 int pb_protocol_serialise_boot_option(const struct boot_option *opt,
 311                 char *buf, int buf_len)
 312 {
 313         char *pos = buf;
 314
 315         pos += pb_protocol_serialise_string(pos, opt->device_id);
 316         pos += pb_protocol_serialise_string(pos, opt->id);
 317         pos += pb_protocol_serialise_string(pos, opt->name);
 318         pos += pb_protocol_serialise_string(pos, opt->description);
 319         pos += pb_protocol_serialise_string(pos, opt->icon_file);
 320         pos += pb_protocol_serialise_string(pos, opt->boot_image_file);
 321         pos += pb_protocol_serialise_string(pos, opt->initrd_file);
 322         pos += pb_protocol_serialise_string(pos, opt->dtb_file);
 323         pos += pb_protocol_serialise_string(pos, opt->boot_args);
 324
 325         *(bool *)pos = opt->is_default;
 326         pos += sizeof(bool);
 327
 328         assert(pos <= buf + buf_len);
 329         (void)buf_len;
 330
 331         return 0;
 332 }
 333
 334 int pb_protocol_serialise_boot_command(const struct boot_command *boot,
 335                 char *buf, int buf_len)
 336 {
 337         char *pos = buf;
 338
 339         pos += pb_protocol_serialise_string(pos, boot->option_id);
 340         pos += pb_protocol_serialise_string(pos, boot->boot_image_file);
 341         pos += pb_protocol_serialise_string(pos, boot->initrd_file);
 342         pos += pb_protocol_serialise_string(pos, boot->dtb_file);
 343         pos += pb_protocol_serialise_string(pos, boot->boot_args);
 344
 345         assert(pos <= buf + buf_len);
 346         (void)buf_len;
 347
 348         return 0;
 349 }
 350
 351 int pb_protocol_serialise_boot_status(const struct boot_status *status,
 352                 char *buf, int buf_len)
 353 {
 354         char *pos = buf;
 355
 356         *(uint32_t *)pos = __cpu_to_be32(status->type);
 357         pos += sizeof(uint32_t);
 358
 359         pos += pb_protocol_serialise_string(pos, status->message);
 360         pos += pb_protocol_serialise_string(pos, status->detail);
 361
 362         *(uint32_t *)pos = __cpu_to_be32(status->type);
 363         pos += sizeof(uint32_t);
 364
 365         assert(pos <= buf + buf_len);
 366         (void)buf_len;
 367
 368         return 0;
 369 }
 370
 371 int pb_protocol_serialise_system_info(const struct system_info *sysinfo,
 372                 char *buf, int buf_len)
 373 {
 374         char *pos = buf;
 375         unsigned int i;
 376
 377         pos += pb_protocol_serialise_string(pos, sysinfo->type);
 378         pos += pb_protocol_serialise_string(pos, sysinfo->identifier);
 379
 380         *(uint32_t *)pos = __cpu_to_be32(sysinfo->n_interfaces);
 381         pos += sizeof(uint32_t);
 382
 383         for (i = 0; i < sysinfo->n_interfaces; i++) {
 384                 struct interface_info *if_info = sysinfo->interfaces[i];
 385
 386                 *(uint32_t *)pos = __cpu_to_be32(if_info->hwaddr_size);
 387                 pos += sizeof(uint32_t);
 388
 389                 memcpy(pos, if_info->hwaddr, if_info->hwaddr_size);
 390                 pos += if_info->hwaddr_size;
 391
 392                 pos += pb_protocol_serialise_string(pos, if_info->name);
 393
 394                 *(bool *)pos = if_info->link;
 395                 pos += sizeof(bool);
 396         }
 397
 398         *(uint32_t *)pos = __cpu_to_be32(sysinfo->n_blockdevs);
 399         pos += sizeof(uint32_t);
 400
 401         for (i = 0; i < sysinfo->n_blockdevs; i++) {
 402                 struct blockdev_info *bd_info = sysinfo->blockdevs[i];
 403
 404                 pos += pb_protocol_serialise_string(pos, bd_info->name);
 405                 pos += pb_protocol_serialise_string(pos, bd_info->uuid);
 406                 pos += pb_protocol_serialise_string(pos, bd_info->mountpoint);
 407         }
 408
 409         assert(pos <= buf + buf_len);
 410         (void)buf_len;
 411
 412         return 0;
 413 }
 414
 415 static int pb_protocol_serialise_config_interface(char *buf,
 416                 struct interface_config *conf)
 417 {
 418         char *pos = buf;
 419
 420         memcpy(pos, conf->hwaddr, sizeof(conf->hwaddr));
 421         pos += sizeof(conf->hwaddr);
 422
 423         *(uint32_t *)pos = conf->ignore;
 424         pos += 4;
 425
 426         if (conf->ignore)
 427                 return pos - buf;
 428
 429         *(uint32_t *)pos = __cpu_to_be32(conf->method);
 430         pos += 4;
 431
 432         if (conf->method == CONFIG_METHOD_STATIC) {
 433                 pos += pb_protocol_serialise_string(pos,
 434                                 conf->static_config.address);
 435                 pos += pb_protocol_serialise_string(pos,
 436                                 conf->static_config.gateway);
 437         }
 438
 439         return pos - buf;
 440 }
 441
 442 int pb_protocol_serialise_config(const struct config *config,
 443                 char *buf, int buf_len)
 444 {
 445         char *pos = buf;
 446         unsigned int i;
 447
 448         *(uint32_t *)pos = config->autoboot_enabled;
 449         pos += 4;
 450
 451         *(uint32_t *)pos = __cpu_to_be32(config->autoboot_timeout_sec);
 452         pos += 4;
 453
 454         *(uint32_t *)pos = config->safe_mode;
 455         pos += 4;
 456
 457         *(uint32_t *)pos = __cpu_to_be32(config->network.n_interfaces);
 458         pos += 4;
 459         for (i = 0; i < config->network.n_interfaces; i++) {
 460                 struct interface_config *iface =
 461                         config->network.interfaces[i];
 462                 pos += pb_protocol_serialise_config_interface(pos, iface);
 463         }
 464
 465         *(uint32_t *)pos = __cpu_to_be32(config->network.n_dns_servers);
 466         pos += 4;
 467         for (i = 0; i < config->network.n_dns_servers; i++) {
 468                 pos += pb_protocol_serialise_string(pos,
 469                                 config->network.dns_servers[i]);
 470         }
 471
 472         *(uint32_t *)pos = __cpu_to_be32(config->n_boot_priorities);
 473         pos += 4;
 474         for (i = 0; i < config->n_boot_priorities; i++) {
 475                 *(uint32_t *)pos =
 476                         __cpu_to_be32(config->boot_priorities[i].type);
 477                 pos += 4;
 478                 *(uint32_t *)pos =
 479                         __cpu_to_be32(config->boot_priorities[i].priority);
 480                 pos += 4;
 481         }
 482
 483         pos += pb_protocol_serialise_string(pos, config->boot_device);
 484
 485         pos += pb_protocol_serialise_string(pos, config->lang);
 486
 487         assert(pos <= buf + buf_len);
 488         (void)buf_len;
 489
 490         return 0;
 491 }
 492
 493 int pb_protocol_write_message(int fd, struct pb_protocol_message *message)
 494 {
 495         int total_len, rc;
 496         char *pos;
 497
 498         total_len = sizeof(*message) + message->payload_len;
 499
 500         message->payload_len = __cpu_to_be32(message->payload_len);
 501         message->action = __cpu_to_be32(message->action);
 502
 503         for (pos = (void *)message; total_len;) {
 504                 rc = write(fd, pos, total_len);
 505
 506                 if (rc <= 0)
 507                         break;
 508
 509                 total_len -= rc;
 510                 pos += rc;
 511         }
 512
 513         talloc_free(message);
 514
 515         if (!total_len)
 516                 return 0;
 517
 518         pb_log("%s: failed: %s\n", __func__, strerror(errno));
 519         return -1;
 520 }
 521
 522 struct pb_protocol_message *pb_protocol_create_message(void *ctx,
 523                 enum pb_protocol_action action, int payload_len)
 524 {
 525         struct pb_protocol_message *message;
 526
 527         if (payload_len > PB_PROTOCOL_MAX_PAYLOAD_SIZE) {
 528                 pb_log("%s: payload too big %u/%u\n", __func__, payload_len,
 529                         PB_PROTOCOL_MAX_PAYLOAD_SIZE);
 530                 return NULL;
 531         }
 532
 533         message = talloc_size(ctx, sizeof(*message) + payload_len);
 534
 535         /* we convert these to big-endian in write_message() */
 536         message->action = action;
 537         message->payload_len = payload_len;
 538
 539         return message;
 540
 541 }
 542
 543 struct pb_protocol_message *pb_protocol_read_message(void *ctx, int fd)
 544 {
 545         struct pb_protocol_message *message, m;
 546         int rc;
 547         unsigned int len;
 548
 549         /* use the stack for the initial 8-byte read */
 550
 551         rc = read(fd, &m, sizeof(m));
 552         if (rc != sizeof(m))
 553                 return NULL;
 554
 555         m.payload_len = __be32_to_cpu(m.payload_len);
 556         m.action = __be32_to_cpu(m.action);
 557
 558         if (m.payload_len > PB_PROTOCOL_MAX_PAYLOAD_SIZE) {
 559                 pb_log("%s: payload too big %u/%u\n", __func__, m.payload_len,
 560                         PB_PROTOCOL_MAX_PAYLOAD_SIZE);
 561                 return NULL;
 562         }
 563
 564         message = talloc_size(ctx, sizeof(m) + m.payload_len);
 565         memcpy(message, &m, sizeof(m));
 566
 567         for (len = 0; len < m.payload_len;) {
 568                 rc = read(fd, message->payload + len, m.payload_len - len);
 569
 570                 if (rc <= 0) {
 571                         talloc_free(message);
 572                         pb_log("%s: failed (%u): %s\n", __func__, len,
 573                                 strerror(errno));
 574                         return NULL;
 575                 }
 576
 577                 len += rc;
 578         }
 579
 580         return message;
 581 }
 582
 583
 584 int pb_protocol_deserialise_device(struct device *dev,
 585                 const struct pb_protocol_message *message)
 586 {
 587         unsigned int len;
 588         const char *pos;
 589         int rc = -1;
 590
 591         len = message->payload_len;
 592         pos = message->payload;
 593
 594         if (read_string(dev, &pos, &len, &dev->id))
 595                 goto out;
 596
 597         if (len < sizeof(enum device_type))
 598                 goto out;
 599         dev->type = *(enum device_type *)(pos);
 600         pos += sizeof(enum device_type);
 601         len -= sizeof(enum device_type);
 602
 603         if (read_string(dev, &pos, &len, &dev->name))
 604                 goto out;
 605
 606         if (read_string(dev, &pos, &len, &dev->description))
 607                 goto out;
 608
 609         if (read_string(dev, &pos, &len, &dev->icon_file))
 610                 goto out;
 611
 612         rc = 0;
 613
 614 out:
 615         return rc;
 616 }
 617
 618 int pb_protocol_deserialise_boot_option(struct boot_option *opt,
 619                 const struct pb_protocol_message *message)
 620 {
 621         unsigned int len;
 622         const char *pos;
 623         int rc = -1;
 624
 625         len = message->payload_len;
 626         pos = message->payload;
 627
 628         if (read_string(opt, &pos, &len, &opt->device_id))
 629                 goto out;
 630
 631         if (read_string(opt, &pos, &len, &opt->id))
 632                 goto out;
 633
 634         if (read_string(opt, &pos, &len, &opt->name))
 635                 goto out;
 636
 637         if (read_string(opt, &pos, &len, &opt->description))
 638                 goto out;
 639
 640         if (read_string(opt, &pos, &len, &opt->icon_file))
 641                 goto out;
 642
 643         if (read_string(opt, &pos, &len, &opt->boot_image_file))
 644                 goto out;
 645
 646         if (read_string(opt, &pos, &len, &opt->initrd_file))
 647                 goto out;
 648
 649         if (read_string(opt, &pos, &len, &opt->dtb_file))
 650                 goto out;
 651
 652         if (read_string(opt, &pos, &len, &opt->boot_args))
 653                 goto out;
 654
 655         if (len < sizeof(bool))
 656                 goto out;
 657         opt->is_default = *(bool *)(pos);
 658
 659         rc = 0;
 660
 661 out:
 662         return rc;
 663 }
 664
 665 int pb_protocol_deserialise_boot_command(struct boot_command *cmd,
 666                 const struct pb_protocol_message *message)
 667 {
 668         unsigned int len;
 669         const char *pos;
 670         int rc = -1;
 671
 672         len = message->payload_len;
 673         pos = message->payload;
 674
 675         if (read_string(cmd, &pos, &len, &cmd->option_id))
 676                 goto out;
 677
 678         if (read_string(cmd, &pos, &len, &cmd->boot_image_file))
 679                 goto out;
 680
 681         if (read_string(cmd, &pos, &len, &cmd->initrd_file))
 682                 goto out;
 683
 684         if (read_string(cmd, &pos, &len, &cmd->dtb_file))
 685                 goto out;
 686
 687         if (read_string(cmd, &pos, &len, &cmd->boot_args))
 688                 goto out;
 689
 690         rc = 0;
 691
 692 out:
 693         return rc;
 694 }
 695
 696 int pb_protocol_deserialise_boot_status(struct boot_status *status,
 697                 const struct pb_protocol_message *message)
 698 {
 699         unsigned int len;
 700         const char *pos;
 701         int rc = -1;
 702
 703         len = message->payload_len;
 704         pos = message->payload;
 705
 706         /* first up, the type enum... */
 707         if (len < sizeof(uint32_t))
 708                 goto out;
 709
 710         status->type = __be32_to_cpu(*(uint32_t *)(pos));
 711
 712         switch (status->type) {
 713         case BOOT_STATUS_ERROR:
 714         case BOOT_STATUS_INFO:
 715                 break;
 716         default:
 717                 goto out;
 718         }
 719
 720         pos += sizeof(uint32_t);
 721         len -= sizeof(uint32_t);
 722
 723         /* message and detail strings */
 724         if (read_string(status, &pos, &len, &status->message))
 725                 goto out;
 726
 727         if (read_string(status, &pos, &len, &status->detail))
 728                 goto out;
 729
 730         /* and finally, progress */
 731         if (len < sizeof(uint32_t))
 732                 goto out;
 733
 734         status->progress = __be32_to_cpu(*(uint32_t *)(pos));
 735
 736         /* clamp to 100% */
 737         if (status->progress > 100)
 738                 status->progress = 100;
 739
 740         rc = 0;
 741
 742 out:
 743         return rc;
 744 }
 745
 746 int pb_protocol_deserialise_system_info(struct system_info *sysinfo,
 747                 const struct pb_protocol_message *message)
 748 {
 749         unsigned int len, i;
 750         const char *pos;
 751         int rc = -1;
 752
 753         len = message->payload_len;
 754         pos = message->payload;
 755
 756         /* type and identifier strings */
 757         if (read_string(sysinfo, &pos, &len, &sysinfo->type))
 758                 goto out;
 759
 760         if (read_string(sysinfo, &pos, &len, &sysinfo->identifier))
 761                 goto out;
 762
 763         /* number of interfaces */
 764         if (read_u32(&pos, &len, &sysinfo->n_interfaces))
 765                 goto out;
 766
 767         sysinfo->interfaces = talloc_array(sysinfo, struct interface_info *,
 768                         sysinfo->n_interfaces);
 769
 770         for (i = 0; i < sysinfo->n_interfaces; i++) {
 771                 struct interface_info *if_info = talloc(sysinfo,
 772                                                         struct interface_info);
 773
 774                 if (read_u32(&pos, &len, &if_info->hwaddr_size))
 775                         goto out;
 776
 777                 if (len < if_info->hwaddr_size)
 778                         goto out;
 779
 780                 if_info->hwaddr = talloc_memdup(if_info, pos,
 781                                                 if_info->hwaddr_size);
 782                 pos += if_info->hwaddr_size;
 783                 len -= if_info->hwaddr_size;
 784
 785                 if (read_string(if_info, &pos, &len, &if_info->name))
 786                         goto out;
 787
 788                 if_info->link = *(bool *)pos;
 789                 pos += sizeof(if_info->link);
 790
 791                 sysinfo->interfaces[i] = if_info;
 792         }
 793
 794         /* number of interfaces */
 795         if (read_u32(&pos, &len, &sysinfo->n_blockdevs))
 796                 goto out;
 797
 798         sysinfo->blockdevs = talloc_array(sysinfo, struct blockdev_info *,
 799                         sysinfo->n_blockdevs);
 800
 801         for (i = 0; i < sysinfo->n_blockdevs; i++) {
 802                 struct blockdev_info *bd_info = talloc(sysinfo,
 803                                                         struct blockdev_info);
 804
 805                 if (read_string(bd_info, &pos, &len, &bd_info->name))
 806                         goto out;
 807
 808                 if (read_string(bd_info, &pos, &len, &bd_info->uuid))
 809                         goto out;
 810
 811                 if (read_string(bd_info, &pos, &len, &bd_info->mountpoint))
 812                         goto out;
 813
 814                 sysinfo->blockdevs[i] = bd_info;
 815         }
 816         rc = 0;
 817
 818 out:
 819         return rc;
 820 }
 821
 822 static int pb_protocol_deserialise_config_interface(const char **buf,
 823                 unsigned int *len, struct interface_config *iface)
 824 {
 825         unsigned int tmp;
 826
 827         if (*len < sizeof(iface->hwaddr))
 828                 return -1;
 829
 830         memcpy(iface->hwaddr, *buf, sizeof(iface->hwaddr));
 831         *buf += sizeof(iface->hwaddr);
 832         *len -= sizeof(iface->hwaddr);
 833
 834         if (read_u32(buf, len, &tmp))
 835                 return -1;
 836         iface->ignore = !!tmp;
 837
 838         if (iface->ignore)
 839                 return 0;
 840
 841         if (read_u32(buf, len, &iface->method))
 842                 return -1;
 843
 844         if (iface->method == CONFIG_METHOD_STATIC) {
 845                 if (read_string(iface, buf, len, &iface->static_config.address))
 846                         return -1;
 847
 848                 if (read_string(iface, buf, len, &iface->static_config.gateway))
 849                         return -1;
 850         }
 851
 852         return 0;
 853 }
 854
 855 int pb_protocol_deserialise_config(struct config *config,
 856                 const struct pb_protocol_message *message)
 857 {
 858         unsigned int len, i, tmp;
 859         const char *pos;
 860         int rc = -1;
 861         char *str;
 862
 863         len = message->payload_len;
 864         pos = message->payload;
 865
 866         if (read_u32(&pos, &len, &tmp))
 867                 goto out;
 868         config->autoboot_enabled = !!tmp;
 869
 870         if (read_u32(&pos, &len, &config->autoboot_timeout_sec))
 871                 goto out;
 872
 873         if (read_u32(&pos, &len, &tmp))
 874                 goto out;
 875         config->safe_mode = !!tmp;
 876
 877         if (read_u32(&pos, &len, &config->network.n_interfaces))
 878                 goto out;
 879
 880         config->network.interfaces = talloc_array(config,
 881                         struct interface_config *, config->network.n_interfaces);
 882
 883         for (i = 0; i < config->network.n_interfaces; i++) {
 884                 struct interface_config *iface = talloc_zero(
 885                                 config->network.interfaces,
 886                                 struct interface_config);
 887                 if (pb_protocol_deserialise_config_interface(&pos, &len, iface))
 888                         goto out;
 889                 config->network.interfaces[i] = iface;
 890         }
 891
 892         if (read_u32(&pos, &len, &config->network.n_dns_servers))
 893                 goto out;
 894         config->network.dns_servers = talloc_array(config, const char *,
 895                         config->network.n_dns_servers);
 896
 897         for (i = 0; i < config->network.n_dns_servers; i++) {
 898                 if (read_string(config->network.dns_servers, &pos, &len, &str))
 899                         goto out;
 900                 config->network.dns_servers[i] = str;
 901         }
 902
 903         if (read_u32(&pos, &len, &config->n_boot_priorities))
 904                 goto out;
 905         config->boot_priorities = talloc_array(config, struct boot_priority,
 906                         config->n_boot_priorities);
 907
 908         for (i = 0; i < config->n_boot_priorities; i++) {
 909                 if (read_u32(&pos, &len, &tmp))
 910                         goto out;
 911                 config->boot_priorities[i].priority = (int)tmp;
 912                 if (read_u32(&pos, &len, &tmp))
 913                         goto out;
 914                 config->boot_priorities[i].type = tmp;
 915         }
 916
 917         if (read_string(config, &pos, &len, &str))
 918                 goto out;
 919
 920         config->boot_device = str;
 921
 922         if (read_string(config, &pos, &len, &str))
 923                 goto out;
 924
 925         config->lang = str;
 926
 927         rc = 0;
 928
 929 out:
 930         return rc;
 931 }