src/libsystemd-network/sd-dhcp-lease.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright (C) 2013 Intel Corporation. All rights reserved.
   5   Copyright (C) 2014 Tom Gundersen
   6
   7   systemd is free software; you can redistribute it and/or modify it
   8   under the terms of the GNU Lesser General Public License as published by
   9   the Free Software Foundation; either version 2.1 of the License, or
  10   (at your option) any later version.
  11
  12   systemd is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   Lesser General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  19 ***/
  20
  21 #include <stdlib.h>
  22 #include <errno.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25 #include <net/ethernet.h>
  26 #include <arpa/inet.h>
  27 #include <sys/param.h>
  28
  29 #include "util.h"
  30 #include "list.h"
  31 #include "mkdir.h"
  32 #include "fileio.h"
  33
  34 #include "dhcp-protocol.h"
  35 #include "dhcp-internal.h"
  36 #include "dhcp-lease-internal.h"
  37 #include "sd-dhcp-lease.h"
  38 #include "sd-dhcp-client.h"
  39 #include "network-internal.h"
  40
  41 int sd_dhcp_lease_get_address(sd_dhcp_lease *lease, struct in_addr *addr) {
  42         assert_return(lease, -EINVAL);
  43         assert_return(addr, -EINVAL);
  44
  45         addr->s_addr = lease->address;
  46
  47         return 0;
  48 }
  49
  50 int sd_dhcp_lease_get_lifetime(sd_dhcp_lease *lease, uint32_t *lifetime) {
  51         assert_return(lease, -EINVAL);
  52         assert_return(lease, -EINVAL);
  53
  54         *lifetime = lease->lifetime;
  55
  56         return 0;
  57 }
  58
  59 int sd_dhcp_lease_get_mtu(sd_dhcp_lease *lease, uint16_t *mtu) {
  60         assert_return(lease, -EINVAL);
  61         assert_return(mtu, -EINVAL);
  62
  63         if (lease->mtu)
  64                 *mtu = lease->mtu;
  65         else
  66                 return -ENOENT;
  67
  68         return 0;
  69 }
  70
  71 int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, struct in_addr **addr, size_t *addr_size) {
  72         assert_return(lease, -EINVAL);
  73         assert_return(addr, -EINVAL);
  74         assert_return(addr_size, -EINVAL);
  75
  76         if (lease->dns_size) {
  77                 *addr_size = lease->dns_size;
  78                 *addr = lease->dns;
  79         } else
  80                 return -ENOENT;
  81
  82         return 0;
  83 }
  84
  85 int sd_dhcp_lease_get_ntp(sd_dhcp_lease *lease, struct in_addr **addr, size_t *addr_size) {
  86         assert_return(lease, -EINVAL);
  87         assert_return(addr, -EINVAL);
  88         assert_return(addr_size, -EINVAL);
  89
  90         if (lease->ntp_size) {
  91                 *addr_size = lease->ntp_size;
  92                 *addr = lease->ntp;
  93         } else
  94                 return -ENOENT;
  95
  96         return 0;
  97 }
  98
  99 int sd_dhcp_lease_get_domainname(sd_dhcp_lease *lease, const char **domainname) {
 100         assert_return(lease, -EINVAL);
 101         assert_return(domainname, -EINVAL);
 102
 103         if (lease->domainname)
 104                 *domainname = lease->domainname;
 105         else
 106                 return -ENOENT;
 107
 108         return 0;
 109 }
 110
 111 int sd_dhcp_lease_get_hostname(sd_dhcp_lease *lease, const char **hostname) {
 112         assert_return(lease, -EINVAL);
 113         assert_return(hostname, -EINVAL);
 114
 115         if (lease->hostname)
 116                 *hostname = lease->hostname;
 117         else
 118                 return -ENOENT;
 119
 120         return 0;
 121 }
 122
 123 int sd_dhcp_lease_get_root_path(sd_dhcp_lease *lease, const char **root_path) {
 124         assert_return(lease, -EINVAL);
 125         assert_return(root_path, -EINVAL);
 126
 127         if (lease->root_path)
 128                 *root_path = lease->root_path;
 129         else
 130                 return -ENOENT;
 131
 132         return 0;
 133 }
 134
 135 int sd_dhcp_lease_get_router(sd_dhcp_lease *lease, struct in_addr *addr) {
 136         assert_return(lease, -EINVAL);
 137         assert_return(addr, -EINVAL);
 138
 139         if (lease->router != INADDR_ANY)
 140                 addr->s_addr = lease->router;
 141         else
 142                 return -ENOENT;
 143
 144         return 0;
 145 }
 146
 147 int sd_dhcp_lease_get_netmask(sd_dhcp_lease *lease, struct in_addr *addr) {
 148         assert_return(lease, -EINVAL);
 149         assert_return(addr, -EINVAL);
 150
 151         addr->s_addr = lease->subnet_mask;
 152
 153         return 0;
 154 }
 155
 156 int sd_dhcp_lease_get_server_identifier(sd_dhcp_lease *lease, struct in_addr *addr) {
 157         assert_return(lease, -EINVAL);
 158         assert_return(addr, -EINVAL);
 159
 160         addr->s_addr = lease->server_address;
 161
 162         return 0;
 163 }
 164
 165 int sd_dhcp_lease_get_next_server(sd_dhcp_lease *lease, struct in_addr *addr) {
 166         assert_return(lease, -EINVAL);
 167         assert_return(addr, -EINVAL);
 168
 169         addr->s_addr = lease->next_server;
 170
 171         return 0;
 172 }
 173
 174 int sd_dhcp_lease_get_routes(sd_dhcp_lease *lease, struct sd_dhcp_route **routes,
 175         size_t *routes_size) {
 176
 177         assert_return(lease, -EINVAL);
 178         assert_return(routes, -EINVAL);
 179         assert_return(routes_size, -EINVAL);
 180
 181         if (lease->static_route_size) {
 182                 *routes = lease->static_route;
 183                 *routes_size = lease->static_route_size;
 184         } else
 185                 return -ENOENT;
 186
 187         return 0;
 188 }
 189
 190 sd_dhcp_lease *sd_dhcp_lease_ref(sd_dhcp_lease *lease) {
 191         if (lease)
 192                 assert_se(REFCNT_INC(lease->n_ref) >= 2);
 193
 194         return lease;
 195 }
 196
 197 sd_dhcp_lease *sd_dhcp_lease_unref(sd_dhcp_lease *lease) {
 198         if (lease && REFCNT_DEC(lease->n_ref) <= 0) {
 199                 free(lease->hostname);
 200                 free(lease->domainname);
 201                 free(lease->dns);
 202                 free(lease->ntp);
 203                 free(lease->static_route);
 204                 free(lease);
 205         }
 206
 207         return NULL;
 208 }
 209
 210 static void lease_parse_u32(const uint8_t *option, size_t len, uint32_t *ret, uint32_t min) {
 211         be32_t val;
 212
 213         assert(option);
 214         assert(ret);
 215
 216         if (len == 4) {
 217                 memcpy(&val, option, 4);
 218                 *ret = be32toh(val);
 219
 220                 if (*ret < min)
 221                         *ret = min;
 222         }
 223 }
 224
 225 static void lease_parse_s32(const uint8_t *option, size_t len, int32_t *ret) {
 226         lease_parse_u32(option, len, (uint32_t *)ret, 0);
 227 }
 228
 229 static void lease_parse_u16(const uint8_t *option, size_t len, uint16_t *ret, uint16_t min) {
 230         be16_t val;
 231
 232         assert(option);
 233         assert(ret);
 234
 235         if (len == 2) {
 236                 memcpy(&val, option, 2);
 237                 *ret = be16toh(val);
 238
 239                 if (*ret < min)
 240                         *ret = min;
 241         }
 242 }
 243
 244 static void lease_parse_be32(const uint8_t *option, size_t len, be32_t *ret) {
 245         assert(option);
 246         assert(ret);
 247
 248         if (len == 4)
 249                 memcpy(ret, option, 4);
 250 }
 251
 252 static void lease_parse_bool(const uint8_t *option, size_t len, bool *ret) {
 253         assert(option);
 254         assert(ret);
 255
 256         if (len == 1)
 257                 *ret = !!(*option);
 258 }
 259
 260 static void lease_parse_u8(const uint8_t *option, size_t len, uint8_t *ret, uint8_t min) {
 261         assert(option);
 262         assert(ret);
 263
 264         if (len == 1) {
 265                 *ret = *option;
 266
 267                 if (*ret < min)
 268                         *ret = min;
 269         }
 270 }
 271
 272 static int lease_parse_string(const uint8_t *option, size_t len, char **ret) {
 273         assert(option);
 274         assert(ret);
 275
 276         if (len >= 1) {
 277                 char *string;
 278
 279                 string = strndup((const char *)option, len);
 280                 if (!string)
 281                         return -errno;
 282
 283                 free(*ret);
 284                 *ret = string;
 285         }
 286
 287         return 0;
 288 }
 289
 290 static int lease_parse_in_addrs_aux(const uint8_t *option, size_t len, struct in_addr **ret, size_t *ret_size, size_t mult) {
 291         assert(option);
 292         assert(ret);
 293         assert(ret_size);
 294
 295         if (len && !(len % (4 * mult))) {
 296                 size_t size;
 297                 struct in_addr *addresses;
 298
 299                 size = len / 4;
 300
 301                 addresses = newdup(struct in_addr, option, size);
 302                 if (!addresses)
 303                         return -ENOMEM;
 304
 305                 free(*ret);
 306                 *ret = addresses;
 307                 *ret_size = size;
 308         }
 309
 310         return 0;
 311 }
 312
 313 static int lease_parse_in_addrs(const uint8_t *option, size_t len, struct in_addr **ret, size_t *ret_size) {
 314         return lease_parse_in_addrs_aux(option, len, ret, ret_size, 1);
 315 }
 316
 317 static int lease_parse_in_addrs_pairs(const uint8_t *option, size_t len, struct in_addr **ret, size_t *ret_size) {
 318         return lease_parse_in_addrs_aux(option, len, ret, ret_size, 2);
 319 }
 320
 321 static int class_prefixlen(uint8_t msb_octet, uint8_t *ret) {
 322         if (msb_octet < 128)
 323                 /* Class A */
 324                 *ret = 8;
 325         else if (msb_octet < 192)
 326                 /* Class B */
 327                 *ret = 16;
 328         else if (msb_octet < 224)
 329                 /* Class C */
 330                 *ret = 24;
 331         else
 332                 /* Class D or E -- no subnet mask */
 333                 return -ERANGE;
 334
 335         return 0;
 336 }
 337
 338 static int lease_parse_routes(const uint8_t *option, size_t len, struct sd_dhcp_route **routes,
 339         size_t *routes_size, size_t *routes_allocated) {
 340
 341         struct in_addr addr;
 342
 343         assert(option);
 344         assert(routes);
 345         assert(routes_size);
 346         assert(routes_allocated);
 347
 348         if (!len)
 349                 return 0;
 350
 351         if (len % 8 != 0)
 352                 return -EINVAL;
 353
 354         if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + (len / 8)))
 355                 return -ENOMEM;
 356
 357         while (len >= 8) {
 358                 struct sd_dhcp_route *route = *routes + *routes_size;
 359
 360                 if (class_prefixlen(*option, &route->dst_prefixlen) < 0) {
 361                         log_error("Failed to determine destination prefix length from class based IP, ignoring");
 362                         continue;
 363                 }
 364
 365                 lease_parse_be32(option, 4, &addr.s_addr);
 366                 route->dst_addr = inet_makeaddr(inet_netof(addr), 0);
 367                 option += 4;
 368
 369                 lease_parse_be32(option, 4, &route->gw_addr.s_addr);
 370                 option += 4;
 371
 372                 len -= 8;
 373                 (*routes_size)++;
 374         }
 375
 376         return 0;
 377 }
 378
 379 /* parses RFC3442 Classless Static Route Option */
 380 static int lease_parse_classless_routes(const uint8_t *option, size_t len, struct sd_dhcp_route **routes,
 381         size_t *routes_size, size_t *routes_allocated) {
 382
 383         assert(option);
 384         assert(routes);
 385         assert(routes_size);
 386         assert(routes_allocated);
 387
 388         /* option format: (subnet-mask-width significant-subnet-octets gateway-ip)*  */
 389
 390         while (len > 0) {
 391                 uint8_t dst_octets;
 392                 struct sd_dhcp_route *route;
 393
 394                 if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + 1))
 395                     return -ENOMEM;
 396
 397                 route = *routes + *routes_size;
 398
 399                 dst_octets = (*option == 0 ? 0 : ((*option - 1) / 8) + 1);
 400                 route->dst_prefixlen = *option;
 401                 option++;
 402                 len--;
 403
 404                 /* can't have more than 4 octets in IPv4 */
 405                 if (dst_octets > 4 || len < dst_octets)
 406                         return -EINVAL;
 407
 408                 route->dst_addr.s_addr = 0;
 409                 memcpy(&route->dst_addr.s_addr, option, dst_octets);
 410                 option += dst_octets;
 411                 len -= dst_octets;
 412
 413                 if (len < 4)
 414                         return -EINVAL;
 415
 416                 lease_parse_be32(option, 4, &route->gw_addr.s_addr);
 417                 option += 4;
 418                 len -= 4;
 419
 420                 (*routes_size)++;
 421         }
 422
 423         return 0;
 424 }
 425
 426 int dhcp_lease_parse_options(uint8_t code, uint8_t len, const uint8_t *option,
 427                               void *user_data) {
 428         sd_dhcp_lease *lease = user_data;
 429         int r;
 430
 431         assert(lease);
 432
 433         switch(code) {
 434
 435         case DHCP_OPTION_TIME_OFFSET:
 436                 lease_parse_s32(option, len, &lease->time_offset);
 437
 438                 break;
 439
 440         case DHCP_OPTION_INTERFACE_MTU_AGING_TIMEOUT:
 441                 lease_parse_u32(option, len, &lease->mtu_aging_timeout, 0);
 442
 443                 break;
 444
 445         case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
 446                 lease_parse_u32(option, len, &lease->lifetime, 1);
 447
 448                 break;
 449
 450         case DHCP_OPTION_SERVER_IDENTIFIER:
 451                 lease_parse_be32(option, len, &lease->server_address);
 452
 453                 break;
 454
 455         case DHCP_OPTION_SUBNET_MASK:
 456                 lease_parse_be32(option, len, &lease->subnet_mask);
 457
 458                 break;
 459
 460         case DHCP_OPTION_BROADCAST:
 461                 lease_parse_be32(option, len, &lease->broadcast);
 462
 463                 break;
 464
 465         case DHCP_OPTION_ROUTER:
 466                 lease_parse_be32(option, len, &lease->router);
 467
 468                 break;
 469
 470         case DHCP_OPTION_DOMAIN_NAME_SERVER:
 471                 r = lease_parse_in_addrs(option, len, &lease->dns, &lease->dns_size);
 472                 if (r < 0)
 473                         return r;
 474
 475                 break;
 476
 477         case DHCP_OPTION_NTP_SERVER:
 478                 r = lease_parse_in_addrs(option, len, &lease->ntp, &lease->ntp_size);
 479                 if (r < 0)
 480                         return r;
 481
 482                 break;
 483
 484         case DHCP_OPTION_POLICY_FILTER:
 485                 r = lease_parse_in_addrs_pairs(option, len, &lease->policy_filter, &lease->policy_filter_size);
 486                 if (r < 0)
 487                         return r;
 488
 489                 break;
 490
 491         case DHCP_OPTION_STATIC_ROUTE:
 492                 r = lease_parse_routes(option, len, &lease->static_route, &lease->static_route_size,
 493                         &lease->static_route_allocated);
 494                 if (r < 0)
 495                         return r;
 496
 497                 break;
 498
 499         case DHCP_OPTION_INTERFACE_MTU:
 500                 lease_parse_u16(option, len, &lease->mtu, 68);
 501
 502                 break;
 503
 504         case DHCP_OPTION_INTERFACE_MDR:
 505                 lease_parse_u16(option, len, &lease->mdr, 576);
 506
 507                 break;
 508
 509         case DHCP_OPTION_INTERFACE_TTL:
 510                 lease_parse_u8(option, len, &lease->ttl, 1);
 511
 512                 break;
 513
 514         case DHCP_OPTION_BOOT_FILE_SIZE:
 515                 lease_parse_u16(option, len, &lease->boot_file_size, 0);
 516
 517                 break;
 518
 519         case DHCP_OPTION_DOMAIN_NAME:
 520                 r = lease_parse_string(option, len, &lease->domainname);
 521                 if (r < 0)
 522                         return r;
 523
 524                 break;
 525
 526         case DHCP_OPTION_HOST_NAME:
 527                 r = lease_parse_string(option, len, &lease->hostname);
 528                 if (r < 0)
 529                         return r;
 530
 531                 break;
 532
 533         case DHCP_OPTION_ROOT_PATH:
 534                 r = lease_parse_string(option, len, &lease->root_path);
 535                 if (r < 0)
 536                         return r;
 537
 538                 break;
 539
 540         case DHCP_OPTION_RENEWAL_T1_TIME:
 541                 lease_parse_u32(option, len, &lease->t1, 1);
 542
 543                 break;
 544
 545         case DHCP_OPTION_REBINDING_T2_TIME:
 546                 lease_parse_u32(option, len, &lease->t2, 1);
 547
 548                 break;
 549
 550         case DHCP_OPTION_ENABLE_IP_FORWARDING:
 551                 lease_parse_bool(option, len, &lease->ip_forward);
 552
 553                 break;
 554
 555         case DHCP_OPTION_ENABLE_IP_FORWARDING_NL:
 556                 lease_parse_bool(option, len, &lease->ip_forward_non_local);
 557
 558                 break;
 559
 560         case DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
 561                 r = lease_parse_classless_routes(option, len, &lease->static_route, &lease->static_route_size,
 562                         &lease->static_route_allocated);
 563                 if (r < 0)
 564                         return r;
 565
 566                 break;
 567         }
 568
 569         return 0;
 570 }
 571
 572 int dhcp_lease_new(sd_dhcp_lease **ret) {
 573         sd_dhcp_lease *lease;
 574
 575         lease = new0(sd_dhcp_lease, 1);
 576         if (!lease)
 577                 return -ENOMEM;
 578
 579         lease->router = INADDR_ANY;
 580         lease->n_ref = REFCNT_INIT;
 581
 582         *ret = lease;
 583         return 0;
 584 }
 585
 586 int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) {
 587         _cleanup_free_ char *temp_path = NULL;
 588         _cleanup_fclose_ FILE *f = NULL;
 589         struct in_addr address;
 590         struct in_addr *addresses;
 591         size_t addresses_size;
 592         const char *string;
 593         uint16_t mtu;
 594         struct sd_dhcp_route *routes;
 595         size_t routes_size;
 596         int r;
 597
 598         assert(lease);
 599         assert(lease_file);
 600
 601         r = fopen_temporary(lease_file, &f, &temp_path);
 602         if (r < 0)
 603                 goto finish;
 604
 605         fchmod(fileno(f), 0644);
 606
 607         r = sd_dhcp_lease_get_address(lease, &address);
 608         if (r < 0)
 609                 goto finish;
 610
 611         fprintf(f,
 612                 "# This is private data. Do not parse.\n"
 613                 "ADDRESS=%s\n", inet_ntoa(address));
 614
 615         r = sd_dhcp_lease_get_netmask(lease, &address);
 616         if (r < 0)
 617                 goto finish;
 618
 619         fprintf(f, "NETMASK=%s\n", inet_ntoa(address));
 620
 621         r = sd_dhcp_lease_get_router(lease, &address);
 622         if (r >= 0)
 623                 fprintf(f, "ROUTER=%s\n", inet_ntoa(address));
 624
 625         r = sd_dhcp_lease_get_server_identifier(lease, &address);
 626         if (r >= 0)
 627                 fprintf(f, "SERVER_ADDRESS=%s\n",
 628                         inet_ntoa(address));
 629
 630         r = sd_dhcp_lease_get_next_server(lease, &address);
 631         if (r >= 0)
 632                 fprintf(f, "NEXT_SERVER=%s\n", inet_ntoa(address));
 633
 634         r = sd_dhcp_lease_get_mtu(lease, &mtu);
 635         if (r >= 0)
 636                 fprintf(f, "MTU=%" PRIu16 "\n", mtu);
 637
 638         r = sd_dhcp_lease_get_dns(lease, &addresses, &addresses_size);
 639         if (r >= 0)
 640                 serialize_in_addrs(f, "DNS", addresses, addresses_size);
 641
 642         r = sd_dhcp_lease_get_ntp(lease, &addresses, &addresses_size);
 643         if (r >= 0)
 644                 serialize_in_addrs(f, "NTP", addresses, addresses_size);
 645
 646         r = sd_dhcp_lease_get_domainname(lease, &string);
 647         if (r >= 0)
 648                 fprintf(f, "DOMAINNAME=%s\n", string);
 649
 650         r = sd_dhcp_lease_get_hostname(lease, &string);
 651         if (r >= 0)
 652                 fprintf(f, "HOSTNAME=%s\n", string);
 653
 654         r = sd_dhcp_lease_get_root_path(lease, &string);
 655         if (r >= 0)
 656                 fprintf(f, "ROOT_PATH=%s\n", string);
 657
 658         r = sd_dhcp_lease_get_routes(lease, &routes, &routes_size);
 659         if (r >= 0)
 660                 serialize_dhcp_routes(f, "ROUTES", routes, routes_size);
 661
 662         r = 0;
 663
 664         fflush(f);
 665
 666         if (ferror(f) || rename(temp_path, lease_file) < 0) {
 667                 r = -errno;
 668                 unlink(lease_file);
 669                 unlink(temp_path);
 670         }
 671
 672 finish:
 673         if (r < 0)
 674                 log_error("Failed to save lease data %s: %s", lease_file, strerror(-r));
 675
 676         return r;
 677 }
 678
 679 int dhcp_lease_load(const char *lease_file, sd_dhcp_lease **ret) {
 680         _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
 681         _cleanup_free_ char *address = NULL, *router = NULL, *netmask = NULL,
 682                             *server_address = NULL, *next_server = NULL,
 683                             *dns = NULL, *ntp = NULL, *mtu = NULL, *routes = NULL;
 684         struct in_addr addr;
 685         int r;
 686
 687         assert(lease_file);
 688         assert(ret);
 689
 690         r = dhcp_lease_new(&lease);
 691         if (r < 0)
 692                 return r;
 693
 694         r = parse_env_file(lease_file, NEWLINE,
 695                            "ADDRESS", &address,
 696                            "ROUTER", &router,
 697                            "NETMASK", &netmask,
 698                            "SERVER_IDENTIFIER", &server_address,
 699                            "NEXT_SERVER", &next_server,
 700                            "DNS", &dns,
 701                            "NTP", &ntp,
 702                            "MTU", &mtu,
 703                            "DOMAINNAME", &lease->domainname,
 704                            "HOSTNAME", &lease->hostname,
 705                            "ROOT_PATH", &lease->root_path,
 706                            "ROUTES", &routes,
 707                            NULL);
 708         if (r < 0) {
 709                 if (r == -ENOENT)
 710                         return 0;
 711
 712                 log_error("Failed to read %s: %s", lease_file, strerror(-r));
 713                 return r;
 714         }
 715
 716         r = inet_pton(AF_INET, address, &addr);
 717         if (r < 0)
 718                 return r;
 719
 720         lease->address = addr.s_addr;
 721
 722         if (router) {
 723                 r = inet_pton(AF_INET, router, &addr);
 724                 if (r < 0)
 725                         return r;
 726
 727                 lease->router = addr.s_addr;
 728         }
 729
 730         r = inet_pton(AF_INET, netmask, &addr);
 731         if (r < 0)
 732                 return r;
 733
 734         lease->subnet_mask = addr.s_addr;
 735
 736         if (server_address) {
 737                 r = inet_pton(AF_INET, server_address, &addr);
 738                 if (r < 0)
 739                         return r;
 740
 741                 lease->server_address = addr.s_addr;
 742         }
 743
 744         if (next_server) {
 745                 r = inet_pton(AF_INET, next_server, &addr);
 746                 if (r < 0)
 747                         return r;
 748
 749                 lease->next_server = addr.s_addr;
 750         }
 751
 752         if (dns) {
 753                 r = deserialize_in_addrs(&lease->dns, &lease->dns_size, dns);
 754                 if (r < 0)
 755                         return r;
 756         }
 757
 758         if (ntp) {
 759                 r = deserialize_in_addrs(&lease->ntp, &lease->ntp_size, dns);
 760                 if (r < 0)
 761                         return r;
 762         }
 763
 764         if (mtu) {
 765                 uint16_t u;
 766                 if (sscanf(mtu, "%" SCNu16, &u) > 0)
 767                         lease->mtu = u;
 768         }
 769
 770         if (routes) {
 771                 r = deserialize_dhcp_routes(&lease->static_route, &lease->static_route_size,
 772                                 &lease->static_route_allocated, routes);
 773                 if (r < 0)
 774                     return r;
 775         }
 776
 777         *ret = lease;
 778         lease = NULL;
 779
 780         return 0;
 781 }
 782
 783 int dhcp_lease_set_default_subnet_mask(sd_dhcp_lease *lease) {
 784         uint32_t address;
 785
 786         assert(lease);
 787         assert(lease->address != INADDR_ANY);
 788
 789         address = be32toh(lease->address);
 790
 791         /* fall back to the default subnet masks based on address class */
 792
 793         if ((address >> 31) == 0x0)
 794                 /* class A, leading bits: 0 */
 795                 lease->subnet_mask = htobe32(0xff000000);
 796         else if ((address >> 30) == 0x2)
 797                 /* class B, leading bits 10 */
 798                 lease->subnet_mask = htobe32(0xffff0000);
 799         else if ((address >> 29) == 0x6)
 800                 /* class C, leading bits 110 */
 801                 lease->subnet_mask = htobe32(0xffffff00);
 802         else
 803                 /* class D or E, no default mask. give up */
 804                 return -ERANGE;
 805
 806         return 0;
 807 }