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 #include "unaligned.h"
  34 #include "in-addr-util.h"
  35
  36 #include "dhcp-protocol.h"
  37 #include "dhcp-internal.h"
  38 #include "dhcp-lease-internal.h"
  39 #include "sd-dhcp-lease.h"
  40 #include "sd-dhcp-client.h"
  41 #include "network-internal.h"
  42
  43 int sd_dhcp_lease_get_address(sd_dhcp_lease *lease, struct in_addr *addr) {
  44         assert_return(lease, -EINVAL);
  45         assert_return(addr, -EINVAL);
  46
  47         addr->s_addr = lease->address;
  48
  49         return 0;
  50 }
  51
  52 int sd_dhcp_lease_get_lifetime(sd_dhcp_lease *lease, uint32_t *lifetime) {
  53         assert_return(lease, -EINVAL);
  54         assert_return(lease, -EINVAL);
  55
  56         *lifetime = lease->lifetime;
  57
  58         return 0;
  59 }
  60
  61 int sd_dhcp_lease_get_mtu(sd_dhcp_lease *lease, uint16_t *mtu) {
  62         assert_return(lease, -EINVAL);
  63         assert_return(mtu, -EINVAL);
  64
  65         if (lease->mtu)
  66                 *mtu = lease->mtu;
  67         else
  68                 return -ENOENT;
  69
  70         return 0;
  71 }
  72
  73 int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, const struct in_addr **addr) {
  74         assert_return(lease, -EINVAL);
  75         assert_return(addr, -EINVAL);
  76
  77         if (lease->dns_size) {
  78                 *addr = lease->dns;
  79                 return lease->dns_size;
  80         } else
  81                 return -ENOENT;
  82
  83         return 0;
  84 }
  85
  86 int sd_dhcp_lease_get_ntp(sd_dhcp_lease *lease, const struct in_addr **addr) {
  87         assert_return(lease, -EINVAL);
  88         assert_return(addr, -EINVAL);
  89
  90         if (lease->ntp_size) {
  91                 *addr = lease->ntp;
  92                 return lease->ntp_size;
  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
 176         assert_return(lease, -EINVAL);
 177         assert_return(routes, -EINVAL);
 178
 179         if (lease->static_route_size) {
 180                 *routes = lease->static_route;
 181                 return lease->static_route_size;
 182         } else
 183                 return -ENOENT;
 184
 185         return 0;
 186 }
 187
 188 sd_dhcp_lease *sd_dhcp_lease_ref(sd_dhcp_lease *lease) {
 189         if (lease)
 190                 assert_se(REFCNT_INC(lease->n_ref) >= 2);
 191
 192         return lease;
 193 }
 194
 195 sd_dhcp_lease *sd_dhcp_lease_unref(sd_dhcp_lease *lease) {
 196         if (lease && REFCNT_DEC(lease->n_ref) <= 0) {
 197                 free(lease->hostname);
 198                 free(lease->domainname);
 199                 free(lease->dns);
 200                 free(lease->ntp);
 201                 free(lease->static_route);
 202                 free(lease);
 203         }
 204
 205         return NULL;
 206 }
 207
 208 static void lease_parse_u32(const uint8_t *option, size_t len, uint32_t *ret, uint32_t min) {
 209         assert(option);
 210         assert(ret);
 211
 212         if (len == 4) {
 213                 *ret = unaligned_read_be32((be32_t*) option);
 214
 215                 if (*ret < min)
 216                         *ret = min;
 217         }
 218 }
 219
 220 static void lease_parse_s32(const uint8_t *option, size_t len, int32_t *ret) {
 221         lease_parse_u32(option, len, (uint32_t *)ret, 0);
 222 }
 223
 224 static void lease_parse_u16(const uint8_t *option, size_t len, uint16_t *ret, uint16_t min) {
 225         assert(option);
 226         assert(ret);
 227
 228         if (len == 2) {
 229                 *ret = unaligned_read_be16((be16_t*) option);
 230
 231                 if (*ret < min)
 232                         *ret = min;
 233         }
 234 }
 235
 236 static void lease_parse_be32(const uint8_t *option, size_t len, be32_t *ret) {
 237         assert(option);
 238         assert(ret);
 239
 240         if (len == 4)
 241                 memcpy(ret, option, 4);
 242 }
 243
 244 static void lease_parse_bool(const uint8_t *option, size_t len, bool *ret) {
 245         assert(option);
 246         assert(ret);
 247
 248         if (len == 1)
 249                 *ret = !!(*option);
 250 }
 251
 252 static void lease_parse_u8(const uint8_t *option, size_t len, uint8_t *ret, uint8_t min) {
 253         assert(option);
 254         assert(ret);
 255
 256         if (len == 1) {
 257                 *ret = *option;
 258
 259                 if (*ret < min)
 260                         *ret = min;
 261         }
 262 }
 263
 264 static int lease_parse_string(const uint8_t *option, size_t len, char **ret) {
 265         assert(option);
 266         assert(ret);
 267
 268         if (len >= 1) {
 269                 char *string;
 270
 271                 string = strndup((const char *)option, len);
 272                 if (!string)
 273                         return -errno;
 274
 275                 free(*ret);
 276                 *ret = string;
 277         }
 278
 279         return 0;
 280 }
 281
 282 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) {
 283         assert(option);
 284         assert(ret);
 285         assert(ret_size);
 286
 287         if (len && !(len % (4 * mult))) {
 288                 size_t size;
 289                 struct in_addr *addresses;
 290
 291                 size = len / 4;
 292
 293                 addresses = newdup(struct in_addr, option, size);
 294                 if (!addresses)
 295                         return -ENOMEM;
 296
 297                 free(*ret);
 298                 *ret = addresses;
 299                 *ret_size = size;
 300         }
 301
 302         return 0;
 303 }
 304
 305 static int lease_parse_in_addrs(const uint8_t *option, size_t len, struct in_addr **ret, size_t *ret_size) {
 306         return lease_parse_in_addrs_aux(option, len, ret, ret_size, 1);
 307 }
 308
 309 static int lease_parse_in_addrs_pairs(const uint8_t *option, size_t len, struct in_addr **ret, size_t *ret_size) {
 310         return lease_parse_in_addrs_aux(option, len, ret, ret_size, 2);
 311 }
 312
 313 static int lease_parse_routes(const uint8_t *option, size_t len, struct sd_dhcp_route **routes,
 314         size_t *routes_size, size_t *routes_allocated) {
 315
 316         struct in_addr addr;
 317
 318         assert(option);
 319         assert(routes);
 320         assert(routes_size);
 321         assert(routes_allocated);
 322
 323         if (!len)
 324                 return 0;
 325
 326         if (len % 8 != 0)
 327                 return -EINVAL;
 328
 329         if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + (len / 8)))
 330                 return -ENOMEM;
 331
 332         while (len >= 8) {
 333                 struct sd_dhcp_route *route = *routes + *routes_size;
 334                 int r;
 335
 336                 r = in_addr_default_prefixlen((struct in_addr*) option, &route->dst_prefixlen);
 337                 if (r < 0) {
 338                         log_error("Failed to determine destination prefix length from class based IP, ignoring");
 339                         continue;
 340                 }
 341
 342                 lease_parse_be32(option, 4, &addr.s_addr);
 343                 route->dst_addr = inet_makeaddr(inet_netof(addr), 0);
 344                 option += 4;
 345
 346                 lease_parse_be32(option, 4, &route->gw_addr.s_addr);
 347                 option += 4;
 348
 349                 len -= 8;
 350                 (*routes_size)++;
 351         }
 352
 353         return 0;
 354 }
 355
 356 /* parses RFC3442 Classless Static Route Option */
 357 static int lease_parse_classless_routes(const uint8_t *option, size_t len, struct sd_dhcp_route **routes,
 358         size_t *routes_size, size_t *routes_allocated) {
 359
 360         assert(option);
 361         assert(routes);
 362         assert(routes_size);
 363         assert(routes_allocated);
 364
 365         /* option format: (subnet-mask-width significant-subnet-octets gateway-ip)*  */
 366
 367         while (len > 0) {
 368                 uint8_t dst_octets;
 369                 struct sd_dhcp_route *route;
 370
 371                 if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + 1))
 372                     return -ENOMEM;
 373
 374                 route = *routes + *routes_size;
 375
 376                 dst_octets = (*option == 0 ? 0 : ((*option - 1) / 8) + 1);
 377                 route->dst_prefixlen = *option;
 378                 option++;
 379                 len--;
 380
 381                 /* can't have more than 4 octets in IPv4 */
 382                 if (dst_octets > 4 || len < dst_octets)
 383                         return -EINVAL;
 384
 385                 route->dst_addr.s_addr = 0;
 386                 memcpy(&route->dst_addr.s_addr, option, dst_octets);
 387                 option += dst_octets;
 388                 len -= dst_octets;
 389
 390                 if (len < 4)
 391                         return -EINVAL;
 392
 393                 lease_parse_be32(option, 4, &route->gw_addr.s_addr);
 394                 option += 4;
 395                 len -= 4;
 396
 397                 (*routes_size)++;
 398         }
 399
 400         return 0;
 401 }
 402
 403 int dhcp_lease_parse_options(uint8_t code, uint8_t len, const uint8_t *option,
 404                               void *user_data) {
 405         sd_dhcp_lease *lease = user_data;
 406         int r;
 407
 408         assert(lease);
 409
 410         switch(code) {
 411
 412         case DHCP_OPTION_TIME_OFFSET:
 413                 lease_parse_s32(option, len, &lease->time_offset);
 414
 415                 break;
 416
 417         case DHCP_OPTION_INTERFACE_MTU_AGING_TIMEOUT:
 418                 lease_parse_u32(option, len, &lease->mtu_aging_timeout, 0);
 419
 420                 break;
 421
 422         case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
 423                 lease_parse_u32(option, len, &lease->lifetime, 1);
 424
 425                 break;
 426
 427         case DHCP_OPTION_SERVER_IDENTIFIER:
 428                 lease_parse_be32(option, len, &lease->server_address);
 429
 430                 break;
 431
 432         case DHCP_OPTION_SUBNET_MASK:
 433                 lease_parse_be32(option, len, &lease->subnet_mask);
 434
 435                 break;
 436
 437         case DHCP_OPTION_BROADCAST:
 438                 lease_parse_be32(option, len, &lease->broadcast);
 439
 440                 break;
 441
 442         case DHCP_OPTION_ROUTER:
 443                 lease_parse_be32(option, len, &lease->router);
 444
 445                 break;
 446
 447         case DHCP_OPTION_DOMAIN_NAME_SERVER:
 448                 r = lease_parse_in_addrs(option, len, &lease->dns, &lease->dns_size);
 449                 if (r < 0)
 450                         return r;
 451
 452                 break;
 453
 454         case DHCP_OPTION_NTP_SERVER:
 455                 r = lease_parse_in_addrs(option, len, &lease->ntp, &lease->ntp_size);
 456                 if (r < 0)
 457                         return r;
 458
 459                 break;
 460
 461         case DHCP_OPTION_POLICY_FILTER:
 462                 r = lease_parse_in_addrs_pairs(option, len, &lease->policy_filter, &lease->policy_filter_size);
 463                 if (r < 0)
 464                         return r;
 465
 466                 break;
 467
 468         case DHCP_OPTION_STATIC_ROUTE:
 469                 r = lease_parse_routes(option, len, &lease->static_route, &lease->static_route_size,
 470                         &lease->static_route_allocated);
 471                 if (r < 0)
 472                         return r;
 473
 474                 break;
 475
 476         case DHCP_OPTION_INTERFACE_MTU:
 477                 lease_parse_u16(option, len, &lease->mtu, 68);
 478
 479                 break;
 480
 481         case DHCP_OPTION_INTERFACE_MDR:
 482                 lease_parse_u16(option, len, &lease->mdr, 576);
 483
 484                 break;
 485
 486         case DHCP_OPTION_INTERFACE_TTL:
 487                 lease_parse_u8(option, len, &lease->ttl, 1);
 488
 489                 break;
 490
 491         case DHCP_OPTION_BOOT_FILE_SIZE:
 492                 lease_parse_u16(option, len, &lease->boot_file_size, 0);
 493
 494                 break;
 495
 496         case DHCP_OPTION_DOMAIN_NAME:
 497         {
 498                 _cleanup_free_ char *domainname = NULL;
 499
 500                 r = lease_parse_string(option, len, &domainname);
 501                 if (r < 0)
 502                         return r;
 503
 504                 if (!hostname_is_valid(domainname) || is_localhost(domainname))
 505                         break;
 506
 507                 free(lease->domainname);
 508                 lease->domainname = domainname;
 509                 domainname = NULL;
 510
 511                 break;
 512         }
 513         case DHCP_OPTION_HOST_NAME:
 514         {
 515                 _cleanup_free_ char *hostname = NULL;
 516
 517                 r = lease_parse_string(option, len, &hostname);
 518                 if (r < 0)
 519                         return r;
 520
 521                 if (!hostname_is_valid(hostname) || is_localhost(hostname))
 522                         break;
 523
 524                 free(lease->hostname);
 525                 lease->hostname = hostname;
 526                 hostname = NULL;
 527
 528                 break;
 529         }
 530         case DHCP_OPTION_ROOT_PATH:
 531                 r = lease_parse_string(option, len, &lease->root_path);
 532                 if (r < 0)
 533                         return r;
 534
 535                 break;
 536
 537         case DHCP_OPTION_RENEWAL_T1_TIME:
 538                 lease_parse_u32(option, len, &lease->t1, 1);
 539
 540                 break;
 541
 542         case DHCP_OPTION_REBINDING_T2_TIME:
 543                 lease_parse_u32(option, len, &lease->t2, 1);
 544
 545                 break;
 546
 547         case DHCP_OPTION_ENABLE_IP_FORWARDING:
 548                 lease_parse_bool(option, len, &lease->ip_forward);
 549
 550                 break;
 551
 552         case DHCP_OPTION_ENABLE_IP_FORWARDING_NL:
 553                 lease_parse_bool(option, len, &lease->ip_forward_non_local);
 554
 555                 break;
 556
 557         case DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
 558                 r = lease_parse_classless_routes(option, len, &lease->static_route, &lease->static_route_size,
 559                         &lease->static_route_allocated);
 560                 if (r < 0)
 561                         return r;
 562
 563                 break;
 564         }
 565
 566         return 0;
 567 }
 568
 569 int dhcp_lease_new(sd_dhcp_lease **ret) {
 570         sd_dhcp_lease *lease;
 571
 572         lease = new0(sd_dhcp_lease, 1);
 573         if (!lease)
 574                 return -ENOMEM;
 575
 576         lease->router = INADDR_ANY;
 577         lease->n_ref = REFCNT_INIT;
 578
 579         *ret = lease;
 580         return 0;
 581 }
 582
 583 int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) {
 584         _cleanup_free_ char *temp_path = NULL;
 585         _cleanup_fclose_ FILE *f = NULL;
 586         struct in_addr address;
 587         const struct in_addr *addresses;
 588         const char *string;
 589         uint16_t mtu;
 590         struct sd_dhcp_route *routes;
 591         int r;
 592
 593         assert(lease);
 594         assert(lease_file);
 595
 596         r = fopen_temporary(lease_file, &f, &temp_path);
 597         if (r < 0)
 598                 goto finish;
 599
 600         fchmod(fileno(f), 0644);
 601
 602         r = sd_dhcp_lease_get_address(lease, &address);
 603         if (r < 0)
 604                 goto finish;
 605
 606         fprintf(f,
 607                 "# This is private data. Do not parse.\n"
 608                 "ADDRESS=%s\n", inet_ntoa(address));
 609
 610         r = sd_dhcp_lease_get_netmask(lease, &address);
 611         if (r < 0)
 612                 goto finish;
 613
 614         fprintf(f, "NETMASK=%s\n", inet_ntoa(address));
 615
 616         r = sd_dhcp_lease_get_router(lease, &address);
 617         if (r >= 0)
 618                 fprintf(f, "ROUTER=%s\n", inet_ntoa(address));
 619
 620         r = sd_dhcp_lease_get_server_identifier(lease, &address);
 621         if (r >= 0)
 622                 fprintf(f, "SERVER_ADDRESS=%s\n",
 623                         inet_ntoa(address));
 624
 625         r = sd_dhcp_lease_get_next_server(lease, &address);
 626         if (r >= 0)
 627                 fprintf(f, "NEXT_SERVER=%s\n", inet_ntoa(address));
 628
 629         r = sd_dhcp_lease_get_mtu(lease, &mtu);
 630         if (r >= 0)
 631                 fprintf(f, "MTU=%" PRIu16 "\n", mtu);
 632
 633         fputs("DNS=", f);
 634         r = sd_dhcp_lease_get_dns(lease, &addresses);
 635         if (r >= 0)
 636                 serialize_in_addrs(f, addresses, r);
 637         fputs("\n", f);
 638
 639         fputs("NTP=", f);
 640         r = sd_dhcp_lease_get_ntp(lease, &addresses);
 641         if (r >= 0)
 642                 serialize_in_addrs(f, addresses, r);
 643         fputs("\n", f);
 644
 645         r = sd_dhcp_lease_get_domainname(lease, &string);
 646         if (r >= 0)
 647                 fprintf(f, "DOMAINNAME=%s\n", string);
 648
 649         r = sd_dhcp_lease_get_hostname(lease, &string);
 650         if (r >= 0)
 651                 fprintf(f, "HOSTNAME=%s\n", string);
 652
 653         r = sd_dhcp_lease_get_root_path(lease, &string);
 654         if (r >= 0)
 655                 fprintf(f, "ROOT_PATH=%s\n", string);
 656
 657         r = sd_dhcp_lease_get_routes(lease, &routes);
 658         if (r >= 0)
 659                 serialize_dhcp_routes(f, "ROUTES", routes, r);
 660
 661         r = 0;
 662
 663         fflush(f);
 664
 665         if (ferror(f) || rename(temp_path, lease_file) < 0) {
 666                 r = -errno;
 667                 unlink(lease_file);
 668                 unlink(temp_path);
 669         }
 670
 671 finish:
 672         if (r < 0)
 673                 log_error("Failed to save lease data %s: %s", lease_file, strerror(-r));
 674
 675         return r;
 676 }
 677
 678 int dhcp_lease_load(const char *lease_file, sd_dhcp_lease **ret) {
 679         _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
 680         _cleanup_free_ char *address = NULL, *router = NULL, *netmask = NULL,
 681                             *server_address = NULL, *next_server = NULL,
 682                             *dns = NULL, *ntp = NULL, *mtu = NULL, *routes = NULL;
 683         struct in_addr addr;
 684         int r;
 685
 686         assert(lease_file);
 687         assert(ret);
 688
 689         r = dhcp_lease_new(&lease);
 690         if (r < 0)
 691                 return r;
 692
 693         r = parse_env_file(lease_file, NEWLINE,
 694                            "ADDRESS", &address,
 695                            "ROUTER", &router,
 696                            "NETMASK", &netmask,
 697                            "SERVER_IDENTIFIER", &server_address,
 698                            "NEXT_SERVER", &next_server,
 699                            "DNS", &dns,
 700                            "NTP", &ntp,
 701                            "MTU", &mtu,
 702                            "DOMAINNAME", &lease->domainname,
 703                            "HOSTNAME", &lease->hostname,
 704                            "ROOT_PATH", &lease->root_path,
 705                            "ROUTES", &routes,
 706                            NULL);
 707         if (r < 0) {
 708                 if (r == -ENOENT)
 709                         return 0;
 710
 711                 log_error("Failed to read %s: %s", lease_file, strerror(-r));
 712                 return r;
 713         }
 714
 715         r = inet_pton(AF_INET, address, &addr);
 716         if (r < 0)
 717                 return r;
 718
 719         lease->address = addr.s_addr;
 720
 721         if (router) {
 722                 r = inet_pton(AF_INET, router, &addr);
 723                 if (r < 0)
 724                         return r;
 725
 726                 lease->router = addr.s_addr;
 727         }
 728
 729         r = inet_pton(AF_INET, netmask, &addr);
 730         if (r < 0)
 731                 return r;
 732
 733         lease->subnet_mask = addr.s_addr;
 734
 735         if (server_address) {
 736                 r = inet_pton(AF_INET, server_address, &addr);
 737                 if (r < 0)
 738                         return r;
 739
 740                 lease->server_address = addr.s_addr;
 741         }
 742
 743         if (next_server) {
 744                 r = inet_pton(AF_INET, next_server, &addr);
 745                 if (r < 0)
 746                         return r;
 747
 748                 lease->next_server = addr.s_addr;
 749         }
 750
 751         if (dns) {
 752                 r = deserialize_in_addrs(&lease->dns, dns);
 753                 if (r < 0)
 754                         return r;
 755
 756                 lease->dns_size = r;
 757         }
 758
 759         if (ntp) {
 760                 r = deserialize_in_addrs(&lease->ntp, ntp);
 761                 if (r < 0)
 762                         return r;
 763
 764                 lease->ntp_size = r;
 765         }
 766
 767         if (mtu) {
 768                 uint16_t u;
 769                 if (sscanf(mtu, "%" SCNu16, &u) > 0)
 770                         lease->mtu = u;
 771         }
 772
 773         if (routes) {
 774                 r = deserialize_dhcp_routes(&lease->static_route, &lease->static_route_size,
 775                                 &lease->static_route_allocated, routes);
 776                 if (r < 0)
 777                     return r;
 778         }
 779
 780         *ret = lease;
 781         lease = NULL;
 782
 783         return 0;
 784 }
 785
 786 int dhcp_lease_set_default_subnet_mask(sd_dhcp_lease *lease) {
 787         struct in_addr address;
 788         struct in_addr mask;
 789         int r;
 790
 791         assert(lease);
 792
 793         address.s_addr = lease->address;
 794
 795         /* fall back to the default subnet masks based on address class */
 796         r = in_addr_default_subnet_mask(&address, &mask);
 797         if (r < 0)
 798                 return r;
 799
 800         lease->subnet_mask = mask.s_addr;
 801
 802         return 0;
 803 }