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 class_prefixlen(uint8_t msb_octet, uint8_t *ret) {
 314         if (msb_octet < 128)
 315                 /* Class A */
 316                 *ret = 8;
 317         else if (msb_octet < 192)
 318                 /* Class B */
 319                 *ret = 16;
 320         else if (msb_octet < 224)
 321                 /* Class C */
 322                 *ret = 24;
 323         else
 324                 /* Class D or E -- no subnet mask */
 325                 return -ERANGE;
 326
 327         return 0;
 328 }
 329
 330 static int lease_parse_routes(const uint8_t *option, size_t len, struct sd_dhcp_route **routes,
 331         size_t *routes_size, size_t *routes_allocated) {
 332
 333         struct in_addr addr;
 334
 335         assert(option);
 336         assert(routes);
 337         assert(routes_size);
 338         assert(routes_allocated);
 339
 340         if (!len)
 341                 return 0;
 342
 343         if (len % 8 != 0)
 344                 return -EINVAL;
 345
 346         if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + (len / 8)))
 347                 return -ENOMEM;
 348
 349         while (len >= 8) {
 350                 struct sd_dhcp_route *route = *routes + *routes_size;
 351
 352                 if (class_prefixlen(*option, &route->dst_prefixlen) < 0) {
 353                         log_error("Failed to determine destination prefix length from class based IP, ignoring");
 354                         continue;
 355                 }
 356
 357                 lease_parse_be32(option, 4, &addr.s_addr);
 358                 route->dst_addr = inet_makeaddr(inet_netof(addr), 0);
 359                 option += 4;
 360
 361                 lease_parse_be32(option, 4, &route->gw_addr.s_addr);
 362                 option += 4;
 363
 364                 len -= 8;
 365                 (*routes_size)++;
 366         }
 367
 368         return 0;
 369 }
 370
 371 /* parses RFC3442 Classless Static Route Option */
 372 static int lease_parse_classless_routes(const uint8_t *option, size_t len, struct sd_dhcp_route **routes,
 373         size_t *routes_size, size_t *routes_allocated) {
 374
 375         assert(option);
 376         assert(routes);
 377         assert(routes_size);
 378         assert(routes_allocated);
 379
 380         /* option format: (subnet-mask-width significant-subnet-octets gateway-ip)*  */
 381
 382         while (len > 0) {
 383                 uint8_t dst_octets;
 384                 struct sd_dhcp_route *route;
 385
 386                 if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + 1))
 387                     return -ENOMEM;
 388
 389                 route = *routes + *routes_size;
 390
 391                 dst_octets = (*option == 0 ? 0 : ((*option - 1) / 8) + 1);
 392                 route->dst_prefixlen = *option;
 393                 option++;
 394                 len--;
 395
 396                 /* can't have more than 4 octets in IPv4 */
 397                 if (dst_octets > 4 || len < dst_octets)
 398                         return -EINVAL;
 399
 400                 route->dst_addr.s_addr = 0;
 401                 memcpy(&route->dst_addr.s_addr, option, dst_octets);
 402                 option += dst_octets;
 403                 len -= dst_octets;
 404
 405                 if (len < 4)
 406                         return -EINVAL;
 407
 408                 lease_parse_be32(option, 4, &route->gw_addr.s_addr);
 409                 option += 4;
 410                 len -= 4;
 411
 412                 (*routes_size)++;
 413         }
 414
 415         return 0;
 416 }
 417
 418 int dhcp_lease_parse_options(uint8_t code, uint8_t len, const uint8_t *option,
 419                               void *user_data) {
 420         sd_dhcp_lease *lease = user_data;
 421         int r;
 422
 423         assert(lease);
 424
 425         switch(code) {
 426
 427         case DHCP_OPTION_TIME_OFFSET:
 428                 lease_parse_s32(option, len, &lease->time_offset);
 429
 430                 break;
 431
 432         case DHCP_OPTION_INTERFACE_MTU_AGING_TIMEOUT:
 433                 lease_parse_u32(option, len, &lease->mtu_aging_timeout, 0);
 434
 435                 break;
 436
 437         case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
 438                 lease_parse_u32(option, len, &lease->lifetime, 1);
 439
 440                 break;
 441
 442         case DHCP_OPTION_SERVER_IDENTIFIER:
 443                 lease_parse_be32(option, len, &lease->server_address);
 444
 445                 break;
 446
 447         case DHCP_OPTION_SUBNET_MASK:
 448                 lease_parse_be32(option, len, &lease->subnet_mask);
 449
 450                 break;
 451
 452         case DHCP_OPTION_BROADCAST:
 453                 lease_parse_be32(option, len, &lease->broadcast);
 454
 455                 break;
 456
 457         case DHCP_OPTION_ROUTER:
 458                 lease_parse_be32(option, len, &lease->router);
 459
 460                 break;
 461
 462         case DHCP_OPTION_DOMAIN_NAME_SERVER:
 463                 r = lease_parse_in_addrs(option, len, &lease->dns, &lease->dns_size);
 464                 if (r < 0)
 465                         return r;
 466
 467                 break;
 468
 469         case DHCP_OPTION_NTP_SERVER:
 470                 r = lease_parse_in_addrs(option, len, &lease->ntp, &lease->ntp_size);
 471                 if (r < 0)
 472                         return r;
 473
 474                 break;
 475
 476         case DHCP_OPTION_POLICY_FILTER:
 477                 r = lease_parse_in_addrs_pairs(option, len, &lease->policy_filter, &lease->policy_filter_size);
 478                 if (r < 0)
 479                         return r;
 480
 481                 break;
 482
 483         case DHCP_OPTION_STATIC_ROUTE:
 484                 r = lease_parse_routes(option, len, &lease->static_route, &lease->static_route_size,
 485                         &lease->static_route_allocated);
 486                 if (r < 0)
 487                         return r;
 488
 489                 break;
 490
 491         case DHCP_OPTION_INTERFACE_MTU:
 492                 lease_parse_u16(option, len, &lease->mtu, 68);
 493
 494                 break;
 495
 496         case DHCP_OPTION_INTERFACE_MDR:
 497                 lease_parse_u16(option, len, &lease->mdr, 576);
 498
 499                 break;
 500
 501         case DHCP_OPTION_INTERFACE_TTL:
 502                 lease_parse_u8(option, len, &lease->ttl, 1);
 503
 504                 break;
 505
 506         case DHCP_OPTION_BOOT_FILE_SIZE:
 507                 lease_parse_u16(option, len, &lease->boot_file_size, 0);
 508
 509                 break;
 510
 511         case DHCP_OPTION_DOMAIN_NAME:
 512         {
 513                 _cleanup_free_ char *domainname = NULL;
 514
 515                 r = lease_parse_string(option, len, &domainname);
 516                 if (r < 0)
 517                         return r;
 518
 519                 if (!hostname_is_valid(domainname) || is_localhost(domainname))
 520                         break;
 521
 522                 free(lease->domainname);
 523                 lease->domainname = domainname;
 524                 domainname = NULL;
 525
 526                 break;
 527         }
 528         case DHCP_OPTION_HOST_NAME:
 529         {
 530                 _cleanup_free_ char *hostname = NULL;
 531
 532                 r = lease_parse_string(option, len, &hostname);
 533                 if (r < 0)
 534                         return r;
 535
 536                 if (!hostname_is_valid(hostname) || is_localhost(hostname))
 537                         break;
 538
 539                 free(lease->hostname);
 540                 lease->hostname = hostname;
 541                 hostname = NULL;
 542
 543                 break;
 544         }
 545         case DHCP_OPTION_ROOT_PATH:
 546                 r = lease_parse_string(option, len, &lease->root_path);
 547                 if (r < 0)
 548                         return r;
 549
 550                 break;
 551
 552         case DHCP_OPTION_RENEWAL_T1_TIME:
 553                 lease_parse_u32(option, len, &lease->t1, 1);
 554
 555                 break;
 556
 557         case DHCP_OPTION_REBINDING_T2_TIME:
 558                 lease_parse_u32(option, len, &lease->t2, 1);
 559
 560                 break;
 561
 562         case DHCP_OPTION_ENABLE_IP_FORWARDING:
 563                 lease_parse_bool(option, len, &lease->ip_forward);
 564
 565                 break;
 566
 567         case DHCP_OPTION_ENABLE_IP_FORWARDING_NL:
 568                 lease_parse_bool(option, len, &lease->ip_forward_non_local);
 569
 570                 break;
 571
 572         case DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
 573                 r = lease_parse_classless_routes(option, len, &lease->static_route, &lease->static_route_size,
 574                         &lease->static_route_allocated);
 575                 if (r < 0)
 576                         return r;
 577
 578                 break;
 579         }
 580
 581         return 0;
 582 }
 583
 584 int dhcp_lease_new(sd_dhcp_lease **ret) {
 585         sd_dhcp_lease *lease;
 586
 587         lease = new0(sd_dhcp_lease, 1);
 588         if (!lease)
 589                 return -ENOMEM;
 590
 591         lease->router = INADDR_ANY;
 592         lease->n_ref = REFCNT_INIT;
 593
 594         *ret = lease;
 595         return 0;
 596 }
 597
 598 int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) {
 599         _cleanup_free_ char *temp_path = NULL;
 600         _cleanup_fclose_ FILE *f = NULL;
 601         struct in_addr address;
 602         const struct in_addr *addresses;
 603         const char *string;
 604         uint16_t mtu;
 605         struct sd_dhcp_route *routes;
 606         int r;
 607
 608         assert(lease);
 609         assert(lease_file);
 610
 611         r = fopen_temporary(lease_file, &f, &temp_path);
 612         if (r < 0)
 613                 goto finish;
 614
 615         fchmod(fileno(f), 0644);
 616
 617         r = sd_dhcp_lease_get_address(lease, &address);
 618         if (r < 0)
 619                 goto finish;
 620
 621         fprintf(f,
 622                 "# This is private data. Do not parse.\n"
 623                 "ADDRESS=%s\n", inet_ntoa(address));
 624
 625         r = sd_dhcp_lease_get_netmask(lease, &address);
 626         if (r < 0)
 627                 goto finish;
 628
 629         fprintf(f, "NETMASK=%s\n", inet_ntoa(address));
 630
 631         r = sd_dhcp_lease_get_router(lease, &address);
 632         if (r >= 0)
 633                 fprintf(f, "ROUTER=%s\n", inet_ntoa(address));
 634
 635         r = sd_dhcp_lease_get_server_identifier(lease, &address);
 636         if (r >= 0)
 637                 fprintf(f, "SERVER_ADDRESS=%s\n",
 638                         inet_ntoa(address));
 639
 640         r = sd_dhcp_lease_get_next_server(lease, &address);
 641         if (r >= 0)
 642                 fprintf(f, "NEXT_SERVER=%s\n", inet_ntoa(address));
 643
 644         r = sd_dhcp_lease_get_mtu(lease, &mtu);
 645         if (r >= 0)
 646                 fprintf(f, "MTU=%" PRIu16 "\n", mtu);
 647
 648         fputs("DNS=", f);
 649         r = sd_dhcp_lease_get_dns(lease, &addresses);
 650         if (r >= 0)
 651                 serialize_in_addrs(f, addresses, r);
 652         fputs("\n", f);
 653
 654         fputs("NTP=", f);
 655         r = sd_dhcp_lease_get_ntp(lease, &addresses);
 656         if (r >= 0)
 657                 serialize_in_addrs(f, addresses, r);
 658         fputs("\n", f);
 659
 660         r = sd_dhcp_lease_get_domainname(lease, &string);
 661         if (r >= 0)
 662                 fprintf(f, "DOMAINNAME=%s\n", string);
 663
 664         r = sd_dhcp_lease_get_hostname(lease, &string);
 665         if (r >= 0)
 666                 fprintf(f, "HOSTNAME=%s\n", string);
 667
 668         r = sd_dhcp_lease_get_root_path(lease, &string);
 669         if (r >= 0)
 670                 fprintf(f, "ROOT_PATH=%s\n", string);
 671
 672         r = sd_dhcp_lease_get_routes(lease, &routes);
 673         if (r >= 0)
 674                 serialize_dhcp_routes(f, "ROUTES", routes, r);
 675
 676         r = 0;
 677
 678         fflush(f);
 679
 680         if (ferror(f) || rename(temp_path, lease_file) < 0) {
 681                 r = -errno;
 682                 unlink(lease_file);
 683                 unlink(temp_path);
 684         }
 685
 686 finish:
 687         if (r < 0)
 688                 log_error("Failed to save lease data %s: %s", lease_file, strerror(-r));
 689
 690         return r;
 691 }
 692
 693 int dhcp_lease_load(const char *lease_file, sd_dhcp_lease **ret) {
 694         _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
 695         _cleanup_free_ char *address = NULL, *router = NULL, *netmask = NULL,
 696                             *server_address = NULL, *next_server = NULL,
 697                             *dns = NULL, *ntp = NULL, *mtu = NULL, *routes = NULL;
 698         struct in_addr addr;
 699         int r;
 700
 701         assert(lease_file);
 702         assert(ret);
 703
 704         r = dhcp_lease_new(&lease);
 705         if (r < 0)
 706                 return r;
 707
 708         r = parse_env_file(lease_file, NEWLINE,
 709                            "ADDRESS", &address,
 710                            "ROUTER", &router,
 711                            "NETMASK", &netmask,
 712                            "SERVER_IDENTIFIER", &server_address,
 713                            "NEXT_SERVER", &next_server,
 714                            "DNS", &dns,
 715                            "NTP", &ntp,
 716                            "MTU", &mtu,
 717                            "DOMAINNAME", &lease->domainname,
 718                            "HOSTNAME", &lease->hostname,
 719                            "ROOT_PATH", &lease->root_path,
 720                            "ROUTES", &routes,
 721                            NULL);
 722         if (r < 0) {
 723                 if (r == -ENOENT)
 724                         return 0;
 725
 726                 log_error("Failed to read %s: %s", lease_file, strerror(-r));
 727                 return r;
 728         }
 729
 730         r = inet_pton(AF_INET, address, &addr);
 731         if (r < 0)
 732                 return r;
 733
 734         lease->address = addr.s_addr;
 735
 736         if (router) {
 737                 r = inet_pton(AF_INET, router, &addr);
 738                 if (r < 0)
 739                         return r;
 740
 741                 lease->router = addr.s_addr;
 742         }
 743
 744         r = inet_pton(AF_INET, netmask, &addr);
 745         if (r < 0)
 746                 return r;
 747
 748         lease->subnet_mask = addr.s_addr;
 749
 750         if (server_address) {
 751                 r = inet_pton(AF_INET, server_address, &addr);
 752                 if (r < 0)
 753                         return r;
 754
 755                 lease->server_address = addr.s_addr;
 756         }
 757
 758         if (next_server) {
 759                 r = inet_pton(AF_INET, next_server, &addr);
 760                 if (r < 0)
 761                         return r;
 762
 763                 lease->next_server = addr.s_addr;
 764         }
 765
 766         if (dns) {
 767                 r = deserialize_in_addrs(&lease->dns, dns);
 768                 if (r < 0)
 769                         return r;
 770
 771                 lease->dns_size = r;
 772         }
 773
 774         if (ntp) {
 775                 r = deserialize_in_addrs(&lease->ntp, ntp);
 776                 if (r < 0)
 777                         return r;
 778
 779                 lease->ntp_size = r;
 780         }
 781
 782         if (mtu) {
 783                 uint16_t u;
 784                 if (sscanf(mtu, "%" SCNu16, &u) > 0)
 785                         lease->mtu = u;
 786         }
 787
 788         if (routes) {
 789                 r = deserialize_dhcp_routes(&lease->static_route, &lease->static_route_size,
 790                                 &lease->static_route_allocated, routes);
 791                 if (r < 0)
 792                     return r;
 793         }
 794
 795         *ret = lease;
 796         lease = NULL;
 797
 798         return 0;
 799 }
 800
 801 int dhcp_lease_set_default_subnet_mask(sd_dhcp_lease *lease) {
 802         struct in_addr address;
 803         struct in_addr mask;
 804         int r;
 805
 806         assert(lease);
 807
 808         address.s_addr = lease->address;
 809
 810         /* fall back to the default subnet masks based on address class */
 811         r = in_addr_default_subnet_mask(&address, &mask);
 812         if (r < 0)
 813                 return r;
 814
 815         lease->subnet_mask = mask.s_addr;
 816
 817         return 0;
 818 }