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_url_len(const char *url)
 293 {
 294         /* url + length field */
 295         return 4 + optional_strlen(url);
 296 }
 297
 298 int pb_protocol_serialise_device(const struct device *dev,
 299                 char *buf, int buf_len)
 300 {
 301         char *pos = buf;
 302
 303         pos += pb_protocol_serialise_string(pos, dev->id);
 304         *(enum device_type *)pos = dev->type;
 305         pos += sizeof(enum device_type);
 306         pos += pb_protocol_serialise_string(pos, dev->name);
 307         pos += pb_protocol_serialise_string(pos, dev->description);
 308         pos += pb_protocol_serialise_string(pos, dev->icon_file);
 309
 310         assert(pos <= buf + buf_len);
 311         (void)buf_len;
 312
 313         return 0;
 314 }
 315
 316 int pb_protocol_serialise_boot_option(const struct boot_option *opt,
 317                 char *buf, int buf_len)
 318 {
 319         char *pos = buf;
 320
 321         pos += pb_protocol_serialise_string(pos, opt->device_id);
 322         pos += pb_protocol_serialise_string(pos, opt->id);
 323         pos += pb_protocol_serialise_string(pos, opt->name);
 324         pos += pb_protocol_serialise_string(pos, opt->description);
 325         pos += pb_protocol_serialise_string(pos, opt->icon_file);
 326         pos += pb_protocol_serialise_string(pos, opt->boot_image_file);
 327         pos += pb_protocol_serialise_string(pos, opt->initrd_file);
 328         pos += pb_protocol_serialise_string(pos, opt->dtb_file);
 329         pos += pb_protocol_serialise_string(pos, opt->boot_args);
 330
 331         *(bool *)pos = opt->is_default;
 332         pos += sizeof(bool);
 333
 334         assert(pos <= buf + buf_len);
 335         (void)buf_len;
 336
 337         return 0;
 338 }
 339
 340 int pb_protocol_serialise_boot_command(const struct boot_command *boot,
 341                 char *buf, int buf_len)
 342 {
 343         char *pos = buf;
 344
 345         pos += pb_protocol_serialise_string(pos, boot->option_id);
 346         pos += pb_protocol_serialise_string(pos, boot->boot_image_file);
 347         pos += pb_protocol_serialise_string(pos, boot->initrd_file);
 348         pos += pb_protocol_serialise_string(pos, boot->dtb_file);
 349         pos += pb_protocol_serialise_string(pos, boot->boot_args);
 350
 351         assert(pos <= buf + buf_len);
 352         (void)buf_len;
 353
 354         return 0;
 355 }
 356
 357 int pb_protocol_serialise_boot_status(const struct boot_status *status,
 358                 char *buf, int buf_len)
 359 {
 360         char *pos = buf;
 361
 362         *(uint32_t *)pos = __cpu_to_be32(status->type);
 363         pos += sizeof(uint32_t);
 364
 365         pos += pb_protocol_serialise_string(pos, status->message);
 366         pos += pb_protocol_serialise_string(pos, status->detail);
 367
 368         *(uint32_t *)pos = __cpu_to_be32(status->type);
 369         pos += sizeof(uint32_t);
 370
 371         assert(pos <= buf + buf_len);
 372         (void)buf_len;
 373
 374         return 0;
 375 }
 376
 377 int pb_protocol_serialise_system_info(const struct system_info *sysinfo,
 378                 char *buf, int buf_len)
 379 {
 380         char *pos = buf;
 381         unsigned int i;
 382
 383         pos += pb_protocol_serialise_string(pos, sysinfo->type);
 384         pos += pb_protocol_serialise_string(pos, sysinfo->identifier);
 385
 386         *(uint32_t *)pos = __cpu_to_be32(sysinfo->n_interfaces);
 387         pos += sizeof(uint32_t);
 388
 389         for (i = 0; i < sysinfo->n_interfaces; i++) {
 390                 struct interface_info *if_info = sysinfo->interfaces[i];
 391
 392                 *(uint32_t *)pos = __cpu_to_be32(if_info->hwaddr_size);
 393                 pos += sizeof(uint32_t);
 394
 395                 memcpy(pos, if_info->hwaddr, if_info->hwaddr_size);
 396                 pos += if_info->hwaddr_size;
 397
 398                 pos += pb_protocol_serialise_string(pos, if_info->name);
 399
 400                 *(bool *)pos = if_info->link;
 401                 pos += sizeof(bool);
 402         }
 403
 404         *(uint32_t *)pos = __cpu_to_be32(sysinfo->n_blockdevs);
 405         pos += sizeof(uint32_t);
 406
 407         for (i = 0; i < sysinfo->n_blockdevs; i++) {
 408                 struct blockdev_info *bd_info = sysinfo->blockdevs[i];
 409
 410                 pos += pb_protocol_serialise_string(pos, bd_info->name);
 411                 pos += pb_protocol_serialise_string(pos, bd_info->uuid);
 412                 pos += pb_protocol_serialise_string(pos, bd_info->mountpoint);
 413         }
 414
 415         assert(pos <= buf + buf_len);
 416         (void)buf_len;
 417
 418         return 0;
 419 }
 420
 421 static int pb_protocol_serialise_config_interface(char *buf,
 422                 struct interface_config *conf)
 423 {
 424         char *pos = buf;
 425
 426         memcpy(pos, conf->hwaddr, sizeof(conf->hwaddr));
 427         pos += sizeof(conf->hwaddr);
 428
 429         *(uint32_t *)pos = conf->ignore;
 430         pos += 4;
 431
 432         if (conf->ignore)
 433                 return pos - buf;
 434
 435         *(uint32_t *)pos = __cpu_to_be32(conf->method);
 436         pos += 4;
 437
 438         if (conf->method == CONFIG_METHOD_STATIC) {
 439                 pos += pb_protocol_serialise_string(pos,
 440                                 conf->static_config.address);
 441                 pos += pb_protocol_serialise_string(pos,
 442                                 conf->static_config.gateway);
 443         }
 444
 445         return pos - buf;
 446 }
 447
 448 int pb_protocol_serialise_config(const struct config *config,
 449                 char *buf, int buf_len)
 450 {
 451         char *pos = buf;
 452         unsigned int i;
 453
 454         *(uint32_t *)pos = config->autoboot_enabled;
 455         pos += 4;
 456
 457         *(uint32_t *)pos = __cpu_to_be32(config->autoboot_timeout_sec);
 458         pos += 4;
 459
 460         *(uint32_t *)pos = config->safe_mode;
 461         pos += 4;
 462
 463         *(uint32_t *)pos = __cpu_to_be32(config->network.n_interfaces);
 464         pos += 4;
 465         for (i = 0; i < config->network.n_interfaces; i++) {
 466                 struct interface_config *iface =
 467                         config->network.interfaces[i];
 468                 pos += pb_protocol_serialise_config_interface(pos, iface);
 469         }
 470
 471         *(uint32_t *)pos = __cpu_to_be32(config->network.n_dns_servers);
 472         pos += 4;
 473         for (i = 0; i < config->network.n_dns_servers; i++) {
 474                 pos += pb_protocol_serialise_string(pos,
 475                                 config->network.dns_servers[i]);
 476         }
 477
 478         *(uint32_t *)pos = __cpu_to_be32(config->n_boot_priorities);
 479         pos += 4;
 480         for (i = 0; i < config->n_boot_priorities; i++) {
 481                 *(uint32_t *)pos =
 482                         __cpu_to_be32(config->boot_priorities[i].type);
 483                 pos += 4;
 484                 *(uint32_t *)pos =
 485                         __cpu_to_be32(config->boot_priorities[i].priority);
 486                 pos += 4;
 487         }
 488
 489         pos += pb_protocol_serialise_string(pos, config->boot_device);
 490
 491         pos += pb_protocol_serialise_string(pos, config->lang);
 492
 493         assert(pos <= buf + buf_len);
 494         (void)buf_len;
 495
 496         return 0;
 497 }
 498
 499 int pb_protocol_serialise_url(const char *url, char *buf, int buf_len)
 500 {
 501         char *pos = buf;
 502
 503         pos += pb_protocol_serialise_string(pos, url);
 504
 505         assert(pos <=buf+buf_len);
 506         (void)buf_len;
 507
 508         return 0;
 509 }
 510
 511 int pb_protocol_write_message(int fd, struct pb_protocol_message *message)
 512 {
 513         int total_len, rc;
 514         char *pos;
 515
 516         total_len = sizeof(*message) + message->payload_len;
 517
 518         message->payload_len = __cpu_to_be32(message->payload_len);
 519         message->action = __cpu_to_be32(message->action);
 520
 521         for (pos = (void *)message; total_len;) {
 522                 rc = write(fd, pos, total_len);
 523
 524                 if (rc <= 0)
 525                         break;
 526
 527                 total_len -= rc;
 528                 pos += rc;
 529         }
 530
 531         talloc_free(message);
 532
 533         if (!total_len)
 534                 return 0;
 535
 536         pb_log("%s: failed: %s\n", __func__, strerror(errno));
 537         return -1;
 538 }
 539
 540 struct pb_protocol_message *pb_protocol_create_message(void *ctx,
 541                 enum pb_protocol_action action, int payload_len)
 542 {
 543         struct pb_protocol_message *message;
 544
 545         if (payload_len > PB_PROTOCOL_MAX_PAYLOAD_SIZE) {
 546                 pb_log("%s: payload too big %u/%u\n", __func__, payload_len,
 547                         PB_PROTOCOL_MAX_PAYLOAD_SIZE);
 548                 return NULL;
 549         }
 550
 551         message = talloc_size(ctx, sizeof(*message) + payload_len);
 552
 553         /* we convert these to big-endian in write_message() */
 554         message->action = action;
 555         message->payload_len = payload_len;
 556
 557         return message;
 558
 559 }
 560
 561 struct pb_protocol_message *pb_protocol_read_message(void *ctx, int fd)
 562 {
 563         struct pb_protocol_message *message, m;
 564         int rc;
 565         unsigned int len;
 566
 567         /* use the stack for the initial 8-byte read */
 568
 569         rc = read(fd, &m, sizeof(m));
 570         if (rc != sizeof(m))
 571                 return NULL;
 572
 573         m.payload_len = __be32_to_cpu(m.payload_len);
 574         m.action = __be32_to_cpu(m.action);
 575
 576         if (m.payload_len > PB_PROTOCOL_MAX_PAYLOAD_SIZE) {
 577                 pb_log("%s: payload too big %u/%u\n", __func__, m.payload_len,
 578                         PB_PROTOCOL_MAX_PAYLOAD_SIZE);
 579                 return NULL;
 580         }
 581
 582         message = talloc_size(ctx, sizeof(m) + m.payload_len);
 583         memcpy(message, &m, sizeof(m));
 584
 585         for (len = 0; len < m.payload_len;) {
 586                 rc = read(fd, message->payload + len, m.payload_len - len);
 587
 588                 if (rc <= 0) {
 589                         talloc_free(message);
 590                         pb_log("%s: failed (%u): %s\n", __func__, len,
 591                                 strerror(errno));
 592                         return NULL;
 593                 }
 594
 595                 len += rc;
 596         }
 597
 598         return message;
 599 }
 600
 601
 602 int pb_protocol_deserialise_device(struct device *dev,
 603                 const struct pb_protocol_message *message)
 604 {
 605         unsigned int len;
 606         const char *pos;
 607         int rc = -1;
 608
 609         len = message->payload_len;
 610         pos = message->payload;
 611
 612         if (read_string(dev, &pos, &len, &dev->id))
 613                 goto out;
 614
 615         if (len < sizeof(enum device_type))
 616                 goto out;
 617         dev->type = *(enum device_type *)(pos);
 618         pos += sizeof(enum device_type);
 619         len -= sizeof(enum device_type);
 620
 621         if (read_string(dev, &pos, &len, &dev->name))
 622                 goto out;
 623
 624         if (read_string(dev, &pos, &len, &dev->description))
 625                 goto out;
 626
 627         if (read_string(dev, &pos, &len, &dev->icon_file))
 628                 goto out;
 629
 630         rc = 0;
 631
 632 out:
 633         return rc;
 634 }
 635
 636 int pb_protocol_deserialise_boot_option(struct boot_option *opt,
 637                 const struct pb_protocol_message *message)
 638 {
 639         unsigned int len;
 640         const char *pos;
 641         int rc = -1;
 642
 643         len = message->payload_len;
 644         pos = message->payload;
 645
 646         if (read_string(opt, &pos, &len, &opt->device_id))
 647                 goto out;
 648
 649         if (read_string(opt, &pos, &len, &opt->id))
 650                 goto out;
 651
 652         if (read_string(opt, &pos, &len, &opt->name))
 653                 goto out;
 654
 655         if (read_string(opt, &pos, &len, &opt->description))
 656                 goto out;
 657
 658         if (read_string(opt, &pos, &len, &opt->icon_file))
 659                 goto out;
 660
 661         if (read_string(opt, &pos, &len, &opt->boot_image_file))
 662                 goto out;
 663
 664         if (read_string(opt, &pos, &len, &opt->initrd_file))
 665                 goto out;
 666
 667         if (read_string(opt, &pos, &len, &opt->dtb_file))
 668                 goto out;
 669
 670         if (read_string(opt, &pos, &len, &opt->boot_args))
 671                 goto out;
 672
 673         if (len < sizeof(bool))
 674                 goto out;
 675         opt->is_default = *(bool *)(pos);
 676
 677         rc = 0;
 678
 679 out:
 680         return rc;
 681 }
 682
 683 int pb_protocol_deserialise_boot_command(struct boot_command *cmd,
 684                 const struct pb_protocol_message *message)
 685 {
 686         unsigned int len;
 687         const char *pos;
 688         int rc = -1;
 689
 690         len = message->payload_len;
 691         pos = message->payload;
 692
 693         if (read_string(cmd, &pos, &len, &cmd->option_id))
 694                 goto out;
 695
 696         if (read_string(cmd, &pos, &len, &cmd->boot_image_file))
 697                 goto out;
 698
 699         if (read_string(cmd, &pos, &len, &cmd->initrd_file))
 700                 goto out;
 701
 702         if (read_string(cmd, &pos, &len, &cmd->dtb_file))
 703                 goto out;
 704
 705         if (read_string(cmd, &pos, &len, &cmd->boot_args))
 706                 goto out;
 707
 708         rc = 0;
 709
 710 out:
 711         return rc;
 712 }
 713
 714 int pb_protocol_deserialise_boot_status(struct boot_status *status,
 715                 const struct pb_protocol_message *message)
 716 {
 717         unsigned int len;
 718         const char *pos;
 719         int rc = -1;
 720
 721         len = message->payload_len;
 722         pos = message->payload;
 723
 724         /* first up, the type enum... */
 725         if (len < sizeof(uint32_t))
 726                 goto out;
 727
 728         status->type = __be32_to_cpu(*(uint32_t *)(pos));
 729
 730         switch (status->type) {
 731         case BOOT_STATUS_ERROR:
 732         case BOOT_STATUS_INFO:
 733                 break;
 734         default:
 735                 goto out;
 736         }
 737
 738         pos += sizeof(uint32_t);
 739         len -= sizeof(uint32_t);
 740
 741         /* message and detail strings */
 742         if (read_string(status, &pos, &len, &status->message))
 743                 goto out;
 744
 745         if (read_string(status, &pos, &len, &status->detail))
 746                 goto out;
 747
 748         /* and finally, progress */
 749         if (len < sizeof(uint32_t))
 750                 goto out;
 751
 752         status->progress = __be32_to_cpu(*(uint32_t *)(pos));
 753
 754         /* clamp to 100% */
 755         if (status->progress > 100)
 756                 status->progress = 100;
 757
 758         rc = 0;
 759
 760 out:
 761         return rc;
 762 }
 763
 764 int pb_protocol_deserialise_system_info(struct system_info *sysinfo,
 765                 const struct pb_protocol_message *message)
 766 {
 767         unsigned int len, i;
 768         const char *pos;
 769         int rc = -1;
 770
 771         len = message->payload_len;
 772         pos = message->payload;
 773
 774         /* type and identifier strings */
 775         if (read_string(sysinfo, &pos, &len, &sysinfo->type))
 776                 goto out;
 777
 778         if (read_string(sysinfo, &pos, &len, &sysinfo->identifier))
 779                 goto out;
 780
 781         /* number of interfaces */
 782         if (read_u32(&pos, &len, &sysinfo->n_interfaces))
 783                 goto out;
 784
 785         sysinfo->interfaces = talloc_array(sysinfo, struct interface_info *,
 786                         sysinfo->n_interfaces);
 787
 788         for (i = 0; i < sysinfo->n_interfaces; i++) {
 789                 struct interface_info *if_info = talloc(sysinfo,
 790                                                         struct interface_info);
 791
 792                 if (read_u32(&pos, &len, &if_info->hwaddr_size))
 793                         goto out;
 794
 795                 if (len < if_info->hwaddr_size)
 796                         goto out;
 797
 798                 if_info->hwaddr = talloc_memdup(if_info, pos,
 799                                                 if_info->hwaddr_size);
 800                 pos += if_info->hwaddr_size;
 801                 len -= if_info->hwaddr_size;
 802
 803                 if (read_string(if_info, &pos, &len, &if_info->name))
 804                         goto out;
 805
 806                 if_info->link = *(bool *)pos;
 807                 pos += sizeof(if_info->link);
 808
 809                 sysinfo->interfaces[i] = if_info;
 810         }
 811
 812         /* number of interfaces */
 813         if (read_u32(&pos, &len, &sysinfo->n_blockdevs))
 814                 goto out;
 815
 816         sysinfo->blockdevs = talloc_array(sysinfo, struct blockdev_info *,
 817                         sysinfo->n_blockdevs);
 818
 819         for (i = 0; i < sysinfo->n_blockdevs; i++) {
 820                 struct blockdev_info *bd_info = talloc(sysinfo,
 821                                                         struct blockdev_info);
 822
 823                 if (read_string(bd_info, &pos, &len, &bd_info->name))
 824                         goto out;
 825
 826                 if (read_string(bd_info, &pos, &len, &bd_info->uuid))
 827                         goto out;
 828
 829                 if (read_string(bd_info, &pos, &len, &bd_info->mountpoint))
 830                         goto out;
 831
 832                 sysinfo->blockdevs[i] = bd_info;
 833         }
 834         rc = 0;
 835
 836 out:
 837         return rc;
 838 }
 839
 840 static int pb_protocol_deserialise_config_interface(const char **buf,
 841                 unsigned int *len, struct interface_config *iface)
 842 {
 843         unsigned int tmp;
 844
 845         if (*len < sizeof(iface->hwaddr))
 846                 return -1;
 847
 848         memcpy(iface->hwaddr, *buf, sizeof(iface->hwaddr));
 849         *buf += sizeof(iface->hwaddr);
 850         *len -= sizeof(iface->hwaddr);
 851
 852         if (read_u32(buf, len, &tmp))
 853                 return -1;
 854         iface->ignore = !!tmp;
 855
 856         if (iface->ignore)
 857                 return 0;
 858
 859         if (read_u32(buf, len, &iface->method))
 860                 return -1;
 861
 862         if (iface->method == CONFIG_METHOD_STATIC) {
 863                 if (read_string(iface, buf, len, &iface->static_config.address))
 864                         return -1;
 865
 866                 if (read_string(iface, buf, len, &iface->static_config.gateway))
 867                         return -1;
 868         }
 869
 870         return 0;
 871 }
 872
 873 int pb_protocol_deserialise_config(struct config *config,
 874                 const struct pb_protocol_message *message)
 875 {
 876         unsigned int len, i, tmp;
 877         const char *pos;
 878         int rc = -1;
 879         char *str;
 880
 881         len = message->payload_len;
 882         pos = message->payload;
 883
 884         if (read_u32(&pos, &len, &tmp))
 885                 goto out;
 886         config->autoboot_enabled = !!tmp;
 887
 888         if (read_u32(&pos, &len, &config->autoboot_timeout_sec))
 889                 goto out;
 890
 891         if (read_u32(&pos, &len, &tmp))
 892                 goto out;
 893         config->safe_mode = !!tmp;
 894
 895         if (read_u32(&pos, &len, &config->network.n_interfaces))
 896                 goto out;
 897
 898         config->network.interfaces = talloc_array(config,
 899                         struct interface_config *, config->network.n_interfaces);
 900
 901         for (i = 0; i < config->network.n_interfaces; i++) {
 902                 struct interface_config *iface = talloc_zero(
 903                                 config->network.interfaces,
 904                                 struct interface_config);
 905                 if (pb_protocol_deserialise_config_interface(&pos, &len, iface))
 906                         goto out;
 907                 config->network.interfaces[i] = iface;
 908         }
 909
 910         if (read_u32(&pos, &len, &config->network.n_dns_servers))
 911                 goto out;
 912         config->network.dns_servers = talloc_array(config, const char *,
 913                         config->network.n_dns_servers);
 914
 915         for (i = 0; i < config->network.n_dns_servers; i++) {
 916                 if (read_string(config->network.dns_servers, &pos, &len, &str))
 917                         goto out;
 918                 config->network.dns_servers[i] = str;
 919         }
 920
 921         if (read_u32(&pos, &len, &config->n_boot_priorities))
 922                 goto out;
 923         config->boot_priorities = talloc_array(config, struct boot_priority,
 924                         config->n_boot_priorities);
 925
 926         for (i = 0; i < config->n_boot_priorities; i++) {
 927                 if (read_u32(&pos, &len, &tmp))
 928                         goto out;
 929                 config->boot_priorities[i].priority = (int)tmp;
 930                 if (read_u32(&pos, &len, &tmp))
 931                         goto out;
 932                 config->boot_priorities[i].type = tmp;
 933         }
 934
 935         if (read_string(config, &pos, &len, &str))
 936                 goto out;
 937
 938         config->boot_device = str;
 939
 940         if (read_string(config, &pos, &len, &str))
 941                 goto out;
 942
 943         config->lang = str;
 944
 945         rc = 0;
 946
 947 out:
 948         return rc;
 949 }