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 "in-addr-util.h"
  34
  35 #include "dhcp-protocol.h"
  36 #include "dhcp-internal.h"
  37 #include "dhcp-lease-internal.h"
  38 #include "sd-dhcp-lease.h"
  39 #include "sd-dhcp-client.h"
  40 #include "network-internal.h"
  41
  42 int sd_dhcp_lease_get_address(sd_dhcp_lease *lease, struct in_addr *addr) {
  43         assert_return(lease, -EINVAL);
  44         assert_return(addr, -EINVAL);
  45
  46         addr->s_addr = lease->address;
  47
  48         return 0;
  49 }
  50
  51 int sd_dhcp_lease_get_lifetime(sd_dhcp_lease *lease, uint32_t *lifetime) {
  52         assert_return(lease, -EINVAL);
  53         assert_return(lease, -EINVAL);
  54
  55         *lifetime = lease->lifetime;
  56
  57         return 0;
  58 }
  59
  60 int sd_dhcp_lease_get_mtu(sd_dhcp_lease *lease, uint16_t *mtu) {
  61         assert_return(lease, -EINVAL);
  62         assert_return(mtu, -EINVAL);
  63
  64         if (lease->mtu)
  65                 *mtu = lease->mtu;
  66         else
  67                 return -ENOENT;
  68
  69         return 0;
  70 }
  71
  72 int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, const struct in_addr **addr) {
  73         assert_return(lease, -EINVAL);
  74         assert_return(addr, -EINVAL);
  75
  76         if (lease->dns_size) {
  77                 *addr = lease->dns;
  78                 return lease->dns_size;
  79         } else
  80                 return -ENOENT;
  81
  82         return 0;
  83 }
  84
  85 int sd_dhcp_lease_get_ntp(sd_dhcp_lease *lease, const struct in_addr **addr) {
  86         assert_return(lease, -EINVAL);
  87         assert_return(addr, -EINVAL);
  88
  89         if (lease->ntp_size) {
  90                 *addr = lease->ntp;
  91                 return lease->ntp_size;
  92         } else
  93                 return -ENOENT;
  94
  95         return 0;
  96 }
  97
  98 int sd_dhcp_lease_get_domainname(sd_dhcp_lease *lease, const char **domainname) {
  99         assert_return(lease, -EINVAL);
 100         assert_return(domainname, -EINVAL);
 101
 102         if (lease->domainname)
 103                 *domainname = lease->domainname;
 104         else
 105                 return -ENOENT;
 106
 107         return 0;
 108 }
 109
 110 int sd_dhcp_lease_get_hostname(sd_dhcp_lease *lease, const char **hostname) {
 111         assert_return(lease, -EINVAL);
 112         assert_return(hostname, -EINVAL);
 113
 114         if (lease->hostname)
 115                 *hostname = lease->hostname;
 116         else
 117                 return -ENOENT;
 118
 119         return 0;
 120 }
 121
 122 int sd_dhcp_lease_get_root_path(sd_dhcp_lease *lease, const char **root_path) {
 123         assert_return(lease, -EINVAL);
 124         assert_return(root_path, -EINVAL);
 125
 126         if (lease->root_path)
 127                 *root_path = lease->root_path;
 128         else
 129                 return -ENOENT;
 130
 131         return 0;
 132 }
 133
 134 int sd_dhcp_lease_get_router(sd_dhcp_lease *lease, struct in_addr *addr) {
 135         assert_return(lease, -EINVAL);
 136         assert_return(addr, -EINVAL);
 137
 138         if (lease->router != INADDR_ANY)
 139                 addr->s_addr = lease->router;
 140         else
 141                 return -ENOENT;
 142
 143         return 0;
 144 }
 145
 146 int sd_dhcp_lease_get_netmask(sd_dhcp_lease *lease, struct in_addr *addr) {
 147         assert_return(lease, -EINVAL);
 148         assert_return(addr, -EINVAL);
 149
 150         addr->s_addr = lease->subnet_mask;
 151
 152         return 0;
 153 }
 154
 155 int sd_dhcp_lease_get_server_identifier(sd_dhcp_lease *lease, struct in_addr *addr) {
 156         assert_return(lease, -EINVAL);
 157         assert_return(addr, -EINVAL);
 158
 159         addr->s_addr = lease->server_address;
 160
 161         return 0;
 162 }
 163
 164 int sd_dhcp_lease_get_next_server(sd_dhcp_lease *lease, struct in_addr *addr) {
 165         assert_return(lease, -EINVAL);
 166         assert_return(addr, -EINVAL);
 167
 168         addr->s_addr = lease->next_server;
 169
 170         return 0;
 171 }
 172
 173 int sd_dhcp_lease_get_routes(sd_dhcp_lease *lease, struct sd_dhcp_route **routes) {
 174
 175         assert_return(lease, -EINVAL);
 176         assert_return(routes, -EINVAL);
 177
 178         if (lease->static_route_size) {
 179                 *routes = lease->static_route;
 180                 return lease->static_route_size;
 181         } else
 182                 return -ENOENT;
 183
 184         return 0;
 185 }
 186
 187 sd_dhcp_lease *sd_dhcp_lease_ref(sd_dhcp_lease *lease) {
 188         if (lease)
 189                 assert_se(REFCNT_INC(lease->n_ref) >= 2);
 190
 191         return lease;
 192 }
 193
 194 sd_dhcp_lease *sd_dhcp_lease_unref(sd_dhcp_lease *lease) {
 195         if (lease && REFCNT_DEC(lease->n_ref) <= 0) {
 196                 free(lease->hostname);
 197                 free(lease->domainname);
 198                 free(lease->dns);
 199                 free(lease->ntp);
 200                 free(lease->static_route);
 201                 free(lease);
 202         }
 203
 204         return NULL;
 205 }
 206
 207 static void lease_parse_u32(const uint8_t *option, size_t len, uint32_t *ret, uint32_t min) {
 208         be32_t val;
 209
 210         assert(option);
 211         assert(ret);
 212
 213         if (len == 4) {
 214                 memcpy(&val, option, 4);
 215                 *ret = be32toh(val);
 216
 217                 if (*ret < min)
 218                         *ret = min;
 219         }
 220 }
 221
 222 static void lease_parse_s32(const uint8_t *option, size_t len, int32_t *ret) {
 223         lease_parse_u32(option, len, (uint32_t *)ret, 0);
 224 }
 225
 226 static void lease_parse_u16(const uint8_t *option, size_t len, uint16_t *ret, uint16_t min) {
 227         be16_t val;
 228
 229         assert(option);
 230         assert(ret);
 231
 232         if (len == 2) {
 233                 memcpy(&val, option, 2);
 234                 *ret = be16toh(val);
 235
 236                 if (*ret < min)
 237                         *ret = min;
 238         }
 239 }
 240
 241 static void lease_parse_be32(const uint8_t *option, size_t len, be32_t *ret) {
 242         assert(option);
 243         assert(ret);
 244
 245         if (len == 4)
 246                 memcpy(ret, option, 4);
 247 }
 248
 249 static void lease_parse_bool(const uint8_t *option, size_t len, bool *ret) {
 250         assert(option);
 251         assert(ret);
 252
 253         if (len == 1)
 254                 *ret = !!(*option);
 255 }
 256
 257 static void lease_parse_u8(const uint8_t *option, size_t len, uint8_t *ret, uint8_t min) {
 258         assert(option);
 259         assert(ret);
 260
 261         if (len == 1) {
 262                 *ret = *option;
 263
 264                 if (*ret < min)
 265                         *ret = min;
 266         }
 267 }
 268
 269 static int lease_parse_string(const uint8_t *option, size_t len, char **ret) {
 270         assert(option);
 271         assert(ret);
 272
 273         if (len >= 1) {
 274                 char *string;
 275
 276                 string = strndup((const char *)option, len);
 277                 if (!string)
 278                         return -errno;
 279
 280                 free(*ret);
 281                 *ret = string;
 282         }
 283
 284         return 0;
 285 }
 286
 287 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) {
 288         assert(option);
 289         assert(ret);
 290         assert(ret_size);
 291
 292         if (len && !(len % (4 * mult))) {
 293                 size_t size;
 294                 struct in_addr *addresses;
 295
 296                 size = len / 4;
 297
 298                 addresses = newdup(struct in_addr, option, size);
 299                 if (!addresses)
 300                         return -ENOMEM;
 301
 302                 free(*ret);
 303                 *ret = addresses;
 304                 *ret_size = size;
 305         }
 306
 307         return 0;
 308 }
 309
 310 static int lease_parse_in_addrs(const uint8_t *option, size_t len, struct in_addr **ret, size_t *ret_size) {
 311         return lease_parse_in_addrs_aux(option, len, ret, ret_size, 1);
 312 }
 313
 314 static int lease_parse_in_addrs_pairs(const uint8_t *option, size_t len, struct in_addr **ret, size_t *ret_size) {
 315         return lease_parse_in_addrs_aux(option, len, ret, ret_size, 2);
 316 }
 317
 318 static int class_prefixlen(uint8_t msb_octet, uint8_t *ret) {
 319         if (msb_octet < 128)
 320                 /* Class A */
 321                 *ret = 8;
 322         else if (msb_octet < 192)
 323                 /* Class B */
 324                 *ret = 16;
 325         else if (msb_octet < 224)
 326                 /* Class C */
 327                 *ret = 24;
 328         else
 329                 /* Class D or E -- no subnet mask */
 330                 return -ERANGE;
 331
 332         return 0;
 333 }
 334
 335 static int lease_parse_routes(const uint8_t *option, size_t len, struct sd_dhcp_route **routes,
 336         size_t *routes_size, size_t *routes_allocated) {
 337
 338         struct in_addr addr;
 339
 340         assert(option);
 341         assert(routes);
 342         assert(routes_size);
 343         assert(routes_allocated);
 344
 345         if (!len)
 346                 return 0;
 347
 348         if (len % 8 != 0)
 349                 return -EINVAL;
 350
 351         if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + (len / 8)))
 352                 return -ENOMEM;
 353
 354         while (len >= 8) {
 355                 struct sd_dhcp_route *route = *routes + *routes_size;
 356
 357                 if (class_prefixlen(*option, &route->dst_prefixlen) < 0) {
 358                         log_error("Failed to determine destination prefix length from class based IP, ignoring");
 359                         continue;
 360                 }
 361
 362                 lease_parse_be32(option, 4, &addr.s_addr);
 363                 route->dst_addr = inet_makeaddr(inet_netof(addr), 0);
 364                 option += 4;
 365
 366                 lease_parse_be32(option, 4, &route->gw_addr.s_addr);
 367                 option += 4;
 368
 369                 len -= 8;
 370                 (*routes_size)++;
 371         }
 372
 373         return 0;
 374 }
 375
 376 /* parses RFC3442 Classless Static Route Option */
 377 static int lease_parse_classless_routes(const uint8_t *option, size_t len, struct sd_dhcp_route **routes,
 378         size_t *routes_size, size_t *routes_allocated) {
 379
 380         assert(option);
 381         assert(routes);
 382         assert(routes_size);
 383         assert(routes_allocated);
 384
 385         /* option format: (subnet-mask-width significant-subnet-octets gateway-ip)*  */
 386
 387         while (len > 0) {
 388                 uint8_t dst_octets;
 389                 struct sd_dhcp_route *route;
 390
 391                 if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + 1))
 392                     return -ENOMEM;
 393
 394                 route = *routes + *routes_size;
 395
 396                 dst_octets = (*option == 0 ? 0 : ((*option - 1) / 8) + 1);
 397                 route->dst_prefixlen = *option;
 398                 option++;
 399                 len--;
 400
 401                 /* can't have more than 4 octets in IPv4 */
 402                 if (dst_octets > 4 || len < dst_octets)
 403                         return -EINVAL;
 404
 405                 route->dst_addr.s_addr = 0;
 406                 memcpy(&route->dst_addr.s_addr, option, dst_octets);
 407                 option += dst_octets;
 408                 len -= dst_octets;
 409
 410                 if (len < 4)
 411                         return -EINVAL;
 412
 413                 lease_parse_be32(option, 4, &route->gw_addr.s_addr);
 414                 option += 4;
 415                 len -= 4;
 416
 417                 (*routes_size)++;
 418         }
 419
 420         return 0;
 421 }
 422
 423 int dhcp_lease_parse_options(uint8_t code, uint8_t len, const uint8_t *option,
 424                               void *user_data) {
 425         sd_dhcp_lease *lease = user_data;
 426         int r;
 427
 428         assert(lease);
 429
 430         switch(code) {
 431
 432         case DHCP_OPTION_TIME_OFFSET:
 433                 lease_parse_s32(option, len, &lease->time_offset);
 434
 435                 break;
 436
 437         case DHCP_OPTION_INTERFACE_MTU_AGING_TIMEOUT:
 438                 lease_parse_u32(option, len, &lease->mtu_aging_timeout, 0);
 439
 440                 break;
 441
 442         case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
 443                 lease_parse_u32(option, len, &lease->lifetime, 1);
 444
 445                 break;
 446
 447         case DHCP_OPTION_SERVER_IDENTIFIER:
 448                 lease_parse_be32(option, len, &lease->server_address);
 449
 450                 break;
 451
 452         case DHCP_OPTION_SUBNET_MASK:
 453                 lease_parse_be32(option, len, &lease->subnet_mask);
 454
 455                 break;
 456
 457         case DHCP_OPTION_BROADCAST:
 458                 lease_parse_be32(option, len, &lease->broadcast);
 459
 460                 break;
 461
 462         case DHCP_OPTION_ROUTER:
 463                 lease_parse_be32(option, len, &lease->router);
 464
 465                 break;
 466
 467         case DHCP_OPTION_DOMAIN_NAME_SERVER:
 468                 r = lease_parse_in_addrs(option, len, &lease->dns, &lease->dns_size);
 469                 if (r < 0)
 470                         return r;
 471
 472                 break;
 473
 474         case DHCP_OPTION_NTP_SERVER:
 475                 r = lease_parse_in_addrs(option, len, &lease->ntp, &lease->ntp_size);
 476                 if (r < 0)
 477                         return r;
 478
 479                 break;
 480
 481         case DHCP_OPTION_POLICY_FILTER:
 482                 r = lease_parse_in_addrs_pairs(option, len, &lease->policy_filter, &lease->policy_filter_size);
 483                 if (r < 0)
 484                         return r;
 485
 486                 break;
 487
 488         case DHCP_OPTION_STATIC_ROUTE:
 489                 r = lease_parse_routes(option, len, &lease->static_route, &lease->static_route_size,
 490                         &lease->static_route_allocated);
 491                 if (r < 0)
 492                         return r;
 493
 494                 break;
 495
 496         case DHCP_OPTION_INTERFACE_MTU:
 497                 lease_parse_u16(option, len, &lease->mtu, 68);
 498
 499                 break;
 500
 501         case DHCP_OPTION_INTERFACE_MDR:
 502                 lease_parse_u16(option, len, &lease->mdr, 576);
 503
 504                 break;
 505
 506         case DHCP_OPTION_INTERFACE_TTL:
 507                 lease_parse_u8(option, len, &lease->ttl, 1);
 508
 509                 break;
 510
 511         case DHCP_OPTION_BOOT_FILE_SIZE:
 512                 lease_parse_u16(option, len, &lease->boot_file_size, 0);
 513
 514                 break;
 515
 516         case DHCP_OPTION_DOMAIN_NAME:
 517         {
 518                 _cleanup_free_ char *domainname = NULL;
 519
 520                 r = lease_parse_string(option, len, &domainname);
 521                 if (r < 0)
 522                         return r;
 523
 524                 if (!hostname_is_valid(domainname) || is_localhost(domainname))
 525                         break;
 526
 527                 free(lease->domainname);
 528                 lease->domainname = domainname;
 529                 domainname = NULL;
 530
 531                 break;
 532         }
 533         case DHCP_OPTION_HOST_NAME:
 534         {
 535                 _cleanup_free_ char *hostname = NULL;
 536
 537                 r = lease_parse_string(option, len, &hostname);
 538                 if (r < 0)
 539                         return r;
 540
 541                 if (!hostname_is_valid(hostname) || is_localhost(hostname))
 542                         break;
 543
 544                 free(lease->hostname);
 545                 lease->hostname = hostname;
 546                 hostname = NULL;
 547
 548                 break;
 549         }
 550         case DHCP_OPTION_ROOT_PATH:
 551                 r = lease_parse_string(option, len, &lease->root_path);
 552                 if (r < 0)
 553                         return r;
 554
 555                 break;
 556
 557         case DHCP_OPTION_RENEWAL_T1_TIME:
 558                 lease_parse_u32(option, len, &lease->t1, 1);
 559
 560                 break;
 561
 562         case DHCP_OPTION_REBINDING_T2_TIME:
 563                 lease_parse_u32(option, len, &lease->t2, 1);
 564
 565                 break;
 566
 567         case DHCP_OPTION_ENABLE_IP_FORWARDING:
 568                 lease_parse_bool(option, len, &lease->ip_forward);
 569
 570                 break;
 571
 572         case DHCP_OPTION_ENABLE_IP_FORWARDING_NL:
 573                 lease_parse_bool(option, len, &lease->ip_forward_non_local);
 574
 575                 break;
 576
 577         case DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
 578                 r = lease_parse_classless_routes(option, len, &lease->static_route, &lease->static_route_size,
 579                         &lease->static_route_allocated);
 580                 if (r < 0)
 581                         return r;
 582
 583                 break;
 584         }
 585
 586         return 0;
 587 }
 588
 589 int dhcp_lease_new(sd_dhcp_lease **ret) {
 590         sd_dhcp_lease *lease;
 591
 592         lease = new0(sd_dhcp_lease, 1);
 593         if (!lease)
 594                 return -ENOMEM;
 595
 596         lease->router = INADDR_ANY;
 597         lease->n_ref = REFCNT_INIT;
 598
 599         *ret = lease;
 600         return 0;
 601 }
 602
 603 int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) {
 604         _cleanup_free_ char *temp_path = NULL;
 605         _cleanup_fclose_ FILE *f = NULL;
 606         struct in_addr address;
 607         const struct in_addr *addresses;
 608         const char *string;
 609         uint16_t mtu;
 610         struct sd_dhcp_route *routes;
 611         int r;
 612
 613         assert(lease);
 614         assert(lease_file);
 615
 616         r = fopen_temporary(lease_file, &f, &temp_path);
 617         if (r < 0)
 618                 goto finish;
 619
 620         fchmod(fileno(f), 0644);
 621
 622         r = sd_dhcp_lease_get_address(lease, &address);
 623         if (r < 0)
 624                 goto finish;
 625
 626         fprintf(f,
 627                 "# This is private data. Do not parse.\n"
 628                 "ADDRESS=%s\n", inet_ntoa(address));
 629
 630         r = sd_dhcp_lease_get_netmask(lease, &address);
 631         if (r < 0)
 632                 goto finish;
 633
 634         fprintf(f, "NETMASK=%s\n", inet_ntoa(address));
 635
 636         r = sd_dhcp_lease_get_router(lease, &address);
 637         if (r >= 0)
 638                 fprintf(f, "ROUTER=%s\n", inet_ntoa(address));
 639
 640         r = sd_dhcp_lease_get_server_identifier(lease, &address);
 641         if (r >= 0)
 642                 fprintf(f, "SERVER_ADDRESS=%s\n",
 643                         inet_ntoa(address));
 644
 645         r = sd_dhcp_lease_get_next_server(lease, &address);
 646         if (r >= 0)
 647                 fprintf(f, "NEXT_SERVER=%s\n", inet_ntoa(address));
 648
 649         r = sd_dhcp_lease_get_mtu(lease, &mtu);
 650         if (r >= 0)
 651                 fprintf(f, "MTU=%" PRIu16 "\n", mtu);
 652
 653         fputs("DNS=", f);
 654         r = sd_dhcp_lease_get_dns(lease, &addresses);
 655         if (r >= 0)
 656                 serialize_in_addrs(f, addresses, r);
 657         fputs("\n", f);
 658
 659         fputs("NTP=", f);
 660         r = sd_dhcp_lease_get_ntp(lease, &addresses);
 661         if (r >= 0)
 662                 serialize_in_addrs(f, addresses, r);
 663         fputs("\n", f);
 664
 665         r = sd_dhcp_lease_get_domainname(lease, &string);
 666         if (r >= 0)
 667                 fprintf(f, "DOMAINNAME=%s\n", string);
 668
 669         r = sd_dhcp_lease_get_hostname(lease, &string);
 670         if (r >= 0)
 671                 fprintf(f, "HOSTNAME=%s\n", string);
 672
 673         r = sd_dhcp_lease_get_root_path(lease, &string);
 674         if (r >= 0)
 675                 fprintf(f, "ROOT_PATH=%s\n", string);
 676
 677         r = sd_dhcp_lease_get_routes(lease, &routes);
 678         if (r >= 0)
 679                 serialize_dhcp_routes(f, "ROUTES", routes, r);
 680
 681         r = 0;
 682
 683         fflush(f);
 684
 685         if (ferror(f) || rename(temp_path, lease_file) < 0) {
 686                 r = -errno;
 687                 unlink(lease_file);
 688                 unlink(temp_path);
 689         }
 690
 691 finish:
 692         if (r < 0)
 693                 log_error("Failed to save lease data %s: %s", lease_file, strerror(-r));
 694
 695         return r;
 696 }
 697
 698 int dhcp_lease_load(const char *lease_file, sd_dhcp_lease **ret) {
 699         _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
 700         _cleanup_free_ char *address = NULL, *router = NULL, *netmask = NULL,
 701                             *server_address = NULL, *next_server = NULL,
 702                             *dns = NULL, *ntp = NULL, *mtu = NULL, *routes = NULL;
 703         struct in_addr addr;
 704         int r;
 705
 706         assert(lease_file);
 707         assert(ret);
 708
 709         r = dhcp_lease_new(&lease);
 710         if (r < 0)
 711                 return r;
 712
 713         r = parse_env_file(lease_file, NEWLINE,
 714                            "ADDRESS", &address,
 715                            "ROUTER", &router,
 716                            "NETMASK", &netmask,
 717                            "SERVER_IDENTIFIER", &server_address,
 718                            "NEXT_SERVER", &next_server,
 719                            "DNS", &dns,
 720                            "NTP", &ntp,
 721                            "MTU", &mtu,
 722                            "DOMAINNAME", &lease->domainname,
 723                            "HOSTNAME", &lease->hostname,
 724                            "ROOT_PATH", &lease->root_path,
 725                            "ROUTES", &routes,
 726                            NULL);
 727         if (r < 0) {
 728                 if (r == -ENOENT)
 729                         return 0;
 730
 731                 log_error("Failed to read %s: %s", lease_file, strerror(-r));
 732                 return r;
 733         }
 734
 735         r = inet_pton(AF_INET, address, &addr);
 736         if (r < 0)
 737                 return r;
 738
 739         lease->address = addr.s_addr;
 740
 741         if (router) {
 742                 r = inet_pton(AF_INET, router, &addr);
 743                 if (r < 0)
 744                         return r;
 745
 746                 lease->router = addr.s_addr;
 747         }
 748
 749         r = inet_pton(AF_INET, netmask, &addr);
 750         if (r < 0)
 751                 return r;
 752
 753         lease->subnet_mask = addr.s_addr;
 754
 755         if (server_address) {
 756                 r = inet_pton(AF_INET, server_address, &addr);
 757                 if (r < 0)
 758                         return r;
 759
 760                 lease->server_address = addr.s_addr;
 761         }
 762
 763         if (next_server) {
 764                 r = inet_pton(AF_INET, next_server, &addr);
 765                 if (r < 0)
 766                         return r;
 767
 768                 lease->next_server = addr.s_addr;
 769         }
 770
 771         if (dns) {
 772                 r = deserialize_in_addrs(&lease->dns, dns);
 773                 if (r < 0)
 774                         return r;
 775
 776                 lease->dns_size = r;
 777         }
 778
 779         if (ntp) {
 780                 r = deserialize_in_addrs(&lease->ntp, ntp);
 781                 if (r < 0)
 782                         return r;
 783
 784                 lease->ntp_size = r;
 785         }
 786
 787         if (mtu) {
 788                 uint16_t u;
 789                 if (sscanf(mtu, "%" SCNu16, &u) > 0)
 790                         lease->mtu = u;
 791         }
 792
 793         if (routes) {
 794                 r = deserialize_dhcp_routes(&lease->static_route, &lease->static_route_size,
 795                                 &lease->static_route_allocated, routes);
 796                 if (r < 0)
 797                     return r;
 798         }
 799
 800         *ret = lease;
 801         lease = NULL;
 802
 803         return 0;
 804 }
 805
 806 int dhcp_lease_set_default_subnet_mask(sd_dhcp_lease *lease) {
 807         struct in_addr address;
 808         struct in_addr mask;
 809         int r;
 810
 811         assert(lease);
 812
 813         address.s_addr = lease->address;
 814
 815         /* fall back to the default subnet masks based on address class */
 816         r = in_addr_default_subnet_mask(&address, &mask);
 817         if (r < 0)
 818                 return r;
 819
 820         lease->subnet_mask = mask.s_addr;
 821
 822         return 0;
 823 }