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

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright © 2013 Intel Corporation. All rights reserved.
   4 ***/
   5
   6 #include <arpa/inet.h>
   7 #include <errno.h>
   8 #include <stdlib.h>
   9 #include <sys/stat.h>
  10 #include <sys/types.h>
  11 #include <unistd.h>
  12
  13 #include "sd-dhcp-lease.h"
  14
  15 #include "alloc-util.h"
  16 #include "dhcp-lease-internal.h"
  17 #include "dhcp-protocol.h"
  18 #include "dns-domain.h"
  19 #include "env-file.h"
  20 #include "fd-util.h"
  21 #include "fileio.h"
  22 #include "hexdecoct.h"
  23 #include "hostname-util.h"
  24 #include "in-addr-util.h"
  25 #include "network-internal.h"
  26 #include "parse-util.h"
  27 #include "stdio-util.h"
  28 #include "string-util.h"
  29 #include "strv.h"
  30 #include "tmpfile-util.h"
  31 #include "unaligned.h"
  32
  33 int sd_dhcp_lease_get_address(sd_dhcp_lease *lease, struct in_addr *addr) {
  34         assert_return(lease, -EINVAL);
  35         assert_return(addr, -EINVAL);
  36
  37         if (lease->address == 0)
  38                 return -ENODATA;
  39
  40         addr->s_addr = lease->address;
  41         return 0;
  42 }
  43
  44 int sd_dhcp_lease_get_broadcast(sd_dhcp_lease *lease, struct in_addr *addr) {
  45         assert_return(lease, -EINVAL);
  46         assert_return(addr, -EINVAL);
  47
  48         if (!lease->have_broadcast)
  49                 return -ENODATA;
  50
  51         addr->s_addr = lease->broadcast;
  52         return 0;
  53 }
  54
  55 int sd_dhcp_lease_get_lifetime(sd_dhcp_lease *lease, uint32_t *lifetime) {
  56         assert_return(lease, -EINVAL);
  57         assert_return(lifetime, -EINVAL);
  58
  59         if (lease->lifetime <= 0)
  60                 return -ENODATA;
  61
  62         *lifetime = lease->lifetime;
  63         return 0;
  64 }
  65
  66 int sd_dhcp_lease_get_t1(sd_dhcp_lease *lease, uint32_t *t1) {
  67         assert_return(lease, -EINVAL);
  68         assert_return(t1, -EINVAL);
  69
  70         if (lease->t1 <= 0)
  71                 return -ENODATA;
  72
  73         *t1 = lease->t1;
  74         return 0;
  75 }
  76
  77 int sd_dhcp_lease_get_t2(sd_dhcp_lease *lease, uint32_t *t2) {
  78         assert_return(lease, -EINVAL);
  79         assert_return(t2, -EINVAL);
  80
  81         if (lease->t2 <= 0)
  82                 return -ENODATA;
  83
  84         *t2 = lease->t2;
  85         return 0;
  86 }
  87
  88 int sd_dhcp_lease_get_mtu(sd_dhcp_lease *lease, uint16_t *mtu) {
  89         assert_return(lease, -EINVAL);
  90         assert_return(mtu, -EINVAL);
  91
  92         if (lease->mtu <= 0)
  93                 return -ENODATA;
  94
  95         *mtu = lease->mtu;
  96         return 0;
  97 }
  98
  99 int sd_dhcp_lease_get_servers(
 100                 sd_dhcp_lease *lease,
 101                 sd_dhcp_lease_info what,
 102                 const struct in_addr **addr) {
 103
 104         assert_return(lease, -EINVAL);
 105         assert_return(addr, -EINVAL);
 106
 107         switch (what) {
 108         case SD_DHCP_LEASE_DNS_SERVERS:
 109                 if (lease->dns_size <= 0)
 110                         return -ENODATA;
 111
 112                 *addr = lease->dns;
 113                 return (int) lease->dns_size;
 114
 115         case SD_DHCP_LEASE_NTP_SERVERS:
 116                 if (lease->ntp_size <= 0)
 117                         return -ENODATA;
 118
 119                 *addr = lease->ntp;
 120                 return (int) lease->ntp_size;
 121
 122         case SD_DHCP_LEASE_SIP_SERVERS:
 123                 if (lease->sip_size <= 0)
 124                         return -ENODATA;
 125
 126                 *addr = lease->sip;
 127                 return (int) lease->sip_size;
 128
 129         case SD_DHCP_LEASE_POP3_SERVERS:
 130                 if (lease->pop3_server_size <= 0)
 131                         return -ENODATA;
 132
 133                 *addr = lease->pop3_server;
 134                 return (int) lease->pop3_server_size;
 135
 136         case SD_DHCP_LEASE_SMTP_SERVERS:
 137                 if (lease->smtp_server_size <= 0)
 138                         return -ENODATA;
 139
 140                 *addr = lease->smtp_server;
 141                 return (int) lease->smtp_server_size;
 142
 143         default:
 144                 log_debug("Uknown DHCP lease info item %d.", what);
 145                 return -ENXIO;
 146         }
 147 }
 148
 149 int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, const struct in_addr **addr) {
 150         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_DNS_SERVERS, addr);
 151 }
 152 int sd_dhcp_lease_get_ntp(sd_dhcp_lease *lease, const struct in_addr **addr) {
 153         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_NTP_SERVERS, addr);
 154 }
 155 int sd_dhcp_lease_get_sip(sd_dhcp_lease *lease, const struct in_addr **addr) {
 156         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_SIP_SERVERS, addr);
 157 }
 158 int sd_dhcp_lease_get_pop3_server(sd_dhcp_lease *lease, const struct in_addr **addr) {
 159         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_POP3_SERVERS, addr);
 160 }
 161 int sd_dhcp_lease_get_smtp_server(sd_dhcp_lease *lease, const struct in_addr **addr) {
 162         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_SMTP_SERVERS, addr);
 163 }
 164
 165 int sd_dhcp_lease_get_domainname(sd_dhcp_lease *lease, const char **domainname) {
 166         assert_return(lease, -EINVAL);
 167         assert_return(domainname, -EINVAL);
 168
 169         if (!lease->domainname)
 170                 return -ENODATA;
 171
 172         *domainname = lease->domainname;
 173         return 0;
 174 }
 175
 176 int sd_dhcp_lease_get_hostname(sd_dhcp_lease *lease, const char **hostname) {
 177         assert_return(lease, -EINVAL);
 178         assert_return(hostname, -EINVAL);
 179
 180         if (!lease->hostname)
 181                 return -ENODATA;
 182
 183         *hostname = lease->hostname;
 184         return 0;
 185 }
 186
 187 int sd_dhcp_lease_get_root_path(sd_dhcp_lease *lease, const char **root_path) {
 188         assert_return(lease, -EINVAL);
 189         assert_return(root_path, -EINVAL);
 190
 191         if (!lease->root_path)
 192                 return -ENODATA;
 193
 194         *root_path = lease->root_path;
 195         return 0;
 196 }
 197
 198 int sd_dhcp_lease_get_router(sd_dhcp_lease *lease, const struct in_addr **addr) {
 199         assert_return(lease, -EINVAL);
 200         assert_return(addr, -EINVAL);
 201
 202         if (lease->router_size <= 0)
 203                 return -ENODATA;
 204
 205         *addr = lease->router;
 206         return (int) lease->router_size;
 207 }
 208
 209 int sd_dhcp_lease_get_netmask(sd_dhcp_lease *lease, struct in_addr *addr) {
 210         assert_return(lease, -EINVAL);
 211         assert_return(addr, -EINVAL);
 212
 213         if (!lease->have_subnet_mask)
 214                 return -ENODATA;
 215
 216         addr->s_addr = lease->subnet_mask;
 217         return 0;
 218 }
 219
 220 int sd_dhcp_lease_get_server_identifier(sd_dhcp_lease *lease, struct in_addr *addr) {
 221         assert_return(lease, -EINVAL);
 222         assert_return(addr, -EINVAL);
 223
 224         if (lease->server_address == 0)
 225                 return -ENODATA;
 226
 227         addr->s_addr = lease->server_address;
 228         return 0;
 229 }
 230
 231 int sd_dhcp_lease_get_next_server(sd_dhcp_lease *lease, struct in_addr *addr) {
 232         assert_return(lease, -EINVAL);
 233         assert_return(addr, -EINVAL);
 234
 235         if (lease->next_server == 0)
 236                 return -ENODATA;
 237
 238         addr->s_addr = lease->next_server;
 239         return 0;
 240 }
 241
 242 /*
 243  * The returned routes array must be freed by the caller.
 244  * Route objects have the same lifetime of the lease and must not be freed.
 245  */
 246 int sd_dhcp_lease_get_routes(sd_dhcp_lease *lease, sd_dhcp_route ***routes) {
 247         sd_dhcp_route **ret;
 248         unsigned i;
 249
 250         assert_return(lease, -EINVAL);
 251         assert_return(routes, -EINVAL);
 252
 253         if (lease->static_route_size <= 0)
 254                 return -ENODATA;
 255
 256         ret = new(sd_dhcp_route *, lease->static_route_size);
 257         if (!ret)
 258                 return -ENOMEM;
 259
 260         for (i = 0; i < lease->static_route_size; i++)
 261                 ret[i] = &lease->static_route[i];
 262
 263         *routes = ret;
 264         return (int) lease->static_route_size;
 265 }
 266
 267 int sd_dhcp_lease_get_search_domains(sd_dhcp_lease *lease, char ***domains) {
 268         size_t r;
 269
 270         assert_return(lease, -EINVAL);
 271         assert_return(domains, -EINVAL);
 272
 273         r = strv_length(lease->search_domains);
 274         if (r > 0) {
 275                 *domains = lease->search_domains;
 276                 return (int) r;
 277         }
 278
 279         return -ENODATA;
 280 }
 281
 282 int sd_dhcp_lease_get_vendor_specific(sd_dhcp_lease *lease, const void **data, size_t *data_len) {
 283         assert_return(lease, -EINVAL);
 284         assert_return(data, -EINVAL);
 285         assert_return(data_len, -EINVAL);
 286
 287         if (lease->vendor_specific_len <= 0)
 288                 return -ENODATA;
 289
 290         *data = lease->vendor_specific;
 291         *data_len = lease->vendor_specific_len;
 292         return 0;
 293 }
 294
 295 static sd_dhcp_lease *dhcp_lease_free(sd_dhcp_lease *lease) {
 296         assert(lease);
 297
 298         while (lease->private_options) {
 299                 struct sd_dhcp_raw_option *option = lease->private_options;
 300
 301                 LIST_REMOVE(options, lease->private_options, option);
 302
 303                 free(option->data);
 304                 free(option);
 305         }
 306
 307         free(lease->root_path);
 308         free(lease->router);
 309         free(lease->timezone);
 310         free(lease->hostname);
 311         free(lease->domainname);
 312         free(lease->dns);
 313         free(lease->ntp);
 314         free(lease->sip);
 315         free(lease->pop3_server);
 316         free(lease->smtp_server);
 317         free(lease->static_route);
 318         free(lease->client_id);
 319         free(lease->vendor_specific);
 320         strv_free(lease->search_domains);
 321         return mfree(lease);
 322 }
 323
 324 DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_lease, sd_dhcp_lease, dhcp_lease_free);
 325
 326 static int lease_parse_u32(const uint8_t *option, size_t len, uint32_t *ret, uint32_t min) {
 327         assert(option);
 328         assert(ret);
 329
 330         if (len != 4)
 331                 return -EINVAL;
 332
 333         *ret = unaligned_read_be32((be32_t*) option);
 334         if (*ret < min)
 335                 *ret = min;
 336
 337         return 0;
 338 }
 339
 340 static int lease_parse_u16(const uint8_t *option, size_t len, uint16_t *ret, uint16_t min) {
 341         assert(option);
 342         assert(ret);
 343
 344         if (len != 2)
 345                 return -EINVAL;
 346
 347         *ret = unaligned_read_be16((be16_t*) option);
 348         if (*ret < min)
 349                 *ret = min;
 350
 351         return 0;
 352 }
 353
 354 static int lease_parse_be32(const uint8_t *option, size_t len, be32_t *ret) {
 355         assert(option);
 356         assert(ret);
 357
 358         if (len != 4)
 359                 return -EINVAL;
 360
 361         memcpy(ret, option, 4);
 362         return 0;
 363 }
 364
 365 static int lease_parse_string(const uint8_t *option, size_t len, char **ret) {
 366         assert(option);
 367         assert(ret);
 368
 369         if (len <= 0)
 370                 *ret = mfree(*ret);
 371         else {
 372                 char *string;
 373
 374                 /*
 375                  * One trailing NUL byte is OK, we don't mind. See:
 376                  * https://github.com/systemd/systemd/issues/1337
 377                  */
 378                 if (memchr(option, 0, len - 1))
 379                         return -EINVAL;
 380
 381                 string = memdup_suffix0((const char *) option, len);
 382                 if (!string)
 383                         return -ENOMEM;
 384
 385                 free_and_replace(*ret, string);
 386         }
 387
 388         return 0;
 389 }
 390
 391 static int lease_parse_domain(const uint8_t *option, size_t len, char **ret) {
 392         _cleanup_free_ char *name = NULL, *normalized = NULL;
 393         int r;
 394
 395         assert(option);
 396         assert(ret);
 397
 398         r = lease_parse_string(option, len, &name);
 399         if (r < 0)
 400                 return r;
 401         if (!name) {
 402                 *ret = mfree(*ret);
 403                 return 0;
 404         }
 405
 406         r = dns_name_normalize(name, 0, &normalized);
 407         if (r < 0)
 408                 return r;
 409
 410         if (is_localhost(normalized))
 411                 return -EINVAL;
 412
 413         if (dns_name_is_root(normalized))
 414                 return -EINVAL;
 415
 416         free_and_replace(*ret, normalized);
 417
 418         return 0;
 419 }
 420
 421 static int lease_parse_in_addrs(const uint8_t *option, size_t len, struct in_addr **ret, size_t *n_ret) {
 422         assert(option);
 423         assert(ret);
 424         assert(n_ret);
 425
 426         if (len <= 0) {
 427                 *ret = mfree(*ret);
 428                 *n_ret = 0;
 429         } else {
 430                 size_t n_addresses;
 431                 struct in_addr *addresses;
 432
 433                 if (len % 4 != 0)
 434                         return -EINVAL;
 435
 436                 n_addresses = len / 4;
 437
 438                 addresses = newdup(struct in_addr, option, n_addresses);
 439                 if (!addresses)
 440                         return -ENOMEM;
 441
 442                 free(*ret);
 443                 *ret = addresses;
 444                 *n_ret = n_addresses;
 445         }
 446
 447         return 0;
 448 }
 449
 450 static int lease_parse_sip_server(const uint8_t *option, size_t len, struct in_addr **ret, size_t *n_ret) {
 451         assert(option);
 452         assert(ret);
 453         assert(n_ret);
 454
 455         if (len <= 0) {
 456                 *ret = mfree(*ret);
 457                 *n_ret = 0;
 458         } else {
 459                 size_t n_addresses;
 460                 struct in_addr *addresses;
 461                 int l = len - 1;
 462
 463                 if (l % 4 != 0)
 464                         return -EINVAL;
 465
 466                 n_addresses = l / 4;
 467
 468                 addresses = newdup(struct in_addr, option + 1, n_addresses);
 469                 if (!addresses)
 470                         return -ENOMEM;
 471
 472                 free(*ret);
 473                 *ret = addresses;
 474                 *n_ret = n_addresses;
 475         }
 476
 477         return 0;
 478 }
 479
 480 static int lease_parse_routes(
 481                 const uint8_t *option, size_t len,
 482                 struct sd_dhcp_route **routes, size_t *routes_size, size_t *routes_allocated) {
 483
 484         struct in_addr addr;
 485
 486         assert(option || len <= 0);
 487         assert(routes);
 488         assert(routes_size);
 489         assert(routes_allocated);
 490
 491         if (len <= 0)
 492                 return 0;
 493
 494         if (len % 8 != 0)
 495                 return -EINVAL;
 496
 497         if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + (len / 8)))
 498                 return -ENOMEM;
 499
 500         while (len >= 8) {
 501                 struct sd_dhcp_route *route = *routes + *routes_size;
 502                 int r;
 503
 504                 route->option = SD_DHCP_OPTION_STATIC_ROUTE;
 505                 r = in4_addr_default_prefixlen((struct in_addr*) option, &route->dst_prefixlen);
 506                 if (r < 0) {
 507                         log_debug("Failed to determine destination prefix length from class based IP, ignoring");
 508                         continue;
 509                 }
 510
 511                 assert_se(lease_parse_be32(option, 4, &addr.s_addr) >= 0);
 512                 route->dst_addr = inet_makeaddr(inet_netof(addr), 0);
 513                 option += 4;
 514
 515                 assert_se(lease_parse_be32(option, 4, &route->gw_addr.s_addr) >= 0);
 516                 option += 4;
 517
 518                 len -= 8;
 519                 (*routes_size)++;
 520         }
 521
 522         return 0;
 523 }
 524
 525 /* parses RFC3442 Classless Static Route Option */
 526 static int lease_parse_classless_routes(
 527                 const uint8_t *option, size_t len,
 528                 struct sd_dhcp_route **routes, size_t *routes_size, size_t *routes_allocated) {
 529
 530         assert(option || len <= 0);
 531         assert(routes);
 532         assert(routes_size);
 533         assert(routes_allocated);
 534
 535         if (len <= 0)
 536                 return 0;
 537
 538         /* option format: (subnet-mask-width significant-subnet-octets gateway-ip)*  */
 539
 540         while (len > 0) {
 541                 uint8_t dst_octets;
 542                 struct sd_dhcp_route *route;
 543
 544                 if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + 1))
 545                         return -ENOMEM;
 546
 547                 route = *routes + *routes_size;
 548                 route->option = SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE;
 549
 550                 dst_octets = (*option == 0 ? 0 : ((*option - 1) / 8) + 1);
 551                 route->dst_prefixlen = *option;
 552                 option++;
 553                 len--;
 554
 555                 /* can't have more than 4 octets in IPv4 */
 556                 if (dst_octets > 4 || len < dst_octets)
 557                         return -EINVAL;
 558
 559                 route->dst_addr.s_addr = 0;
 560                 memcpy(&route->dst_addr.s_addr, option, dst_octets);
 561                 option += dst_octets;
 562                 len -= dst_octets;
 563
 564                 if (len < 4)
 565                         return -EINVAL;
 566
 567                 assert_se(lease_parse_be32(option, 4, &route->gw_addr.s_addr) >= 0);
 568                 option += 4;
 569                 len -= 4;
 570
 571                 (*routes_size)++;
 572         }
 573
 574         return 0;
 575 }
 576
 577 int dhcp_lease_parse_options(uint8_t code, uint8_t len, const void *option, void *userdata) {
 578         sd_dhcp_lease *lease = userdata;
 579         int r;
 580
 581         assert(lease);
 582
 583         switch(code) {
 584
 585         case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
 586                 r = lease_parse_u32(option, len, &lease->lifetime, 1);
 587                 if (r < 0)
 588                         log_debug_errno(r, "Failed to parse lease time, ignoring: %m");
 589
 590                 break;
 591
 592         case SD_DHCP_OPTION_SERVER_IDENTIFIER:
 593                 r = lease_parse_be32(option, len, &lease->server_address);
 594                 if (r < 0)
 595                         log_debug_errno(r, "Failed to parse server identifier, ignoring: %m");
 596
 597                 break;
 598
 599         case SD_DHCP_OPTION_SUBNET_MASK:
 600                 r = lease_parse_be32(option, len, &lease->subnet_mask);
 601                 if (r < 0)
 602                         log_debug_errno(r, "Failed to parse subnet mask, ignoring: %m");
 603                 else
 604                         lease->have_subnet_mask = true;
 605                 break;
 606
 607         case SD_DHCP_OPTION_BROADCAST:
 608                 r = lease_parse_be32(option, len, &lease->broadcast);
 609                 if (r < 0)
 610                         log_debug_errno(r, "Failed to parse broadcast address, ignoring: %m");
 611                 else
 612                         lease->have_broadcast = true;
 613                 break;
 614
 615         case SD_DHCP_OPTION_ROUTER:
 616                 r = lease_parse_in_addrs(option, len, &lease->router, &lease->router_size);
 617                 if (r < 0)
 618                         log_debug_errno(r, "Failed to parse router addresses, ignoring: %m");
 619                 break;
 620
 621         case SD_DHCP_OPTION_DOMAIN_NAME_SERVER:
 622                 r = lease_parse_in_addrs(option, len, &lease->dns, &lease->dns_size);
 623                 if (r < 0)
 624                         log_debug_errno(r, "Failed to parse DNS server, ignoring: %m");
 625                 break;
 626
 627         case SD_DHCP_OPTION_NTP_SERVER:
 628                 r = lease_parse_in_addrs(option, len, &lease->ntp, &lease->ntp_size);
 629                 if (r < 0)
 630                         log_debug_errno(r, "Failed to parse NTP server, ignoring: %m");
 631                 break;
 632
 633         case SD_DHCP_OPTION_SIP_SERVER:
 634                 r = lease_parse_sip_server(option, len, &lease->sip, &lease->sip_size);
 635                 if (r < 0)
 636                         log_debug_errno(r, "Failed to parse SIP server, ignoring: %m");
 637                 break;
 638
 639         case SD_DHCP_OPTION_POP3_SERVER:
 640                 r = lease_parse_in_addrs(option, len, &lease->pop3_server, &lease->pop3_server_size);
 641                 if (r < 0)
 642                         log_debug_errno(r, "Failed to parse POP3 server, ignoring: %m");
 643                 break;
 644
 645         case SD_DHCP_OPTION_SMTP_SERVER:
 646                 r = lease_parse_in_addrs(option, len, &lease->smtp_server, &lease->smtp_server_size);
 647                 if (r < 0)
 648                         log_debug_errno(r, "Failed to parse SMTP server, ignoring: %m");
 649                 break;
 650
 651         case SD_DHCP_OPTION_STATIC_ROUTE:
 652                 r = lease_parse_routes(option, len, &lease->static_route, &lease->static_route_size, &lease->static_route_allocated);
 653                 if (r < 0)
 654                         log_debug_errno(r, "Failed to parse static routes, ignoring: %m");
 655                 break;
 656
 657         case SD_DHCP_OPTION_INTERFACE_MTU:
 658                 r = lease_parse_u16(option, len, &lease->mtu, 68);
 659                 if (r < 0)
 660                         log_debug_errno(r, "Failed to parse MTU, ignoring: %m");
 661                 if (lease->mtu < DHCP_DEFAULT_MIN_SIZE) {
 662                         log_debug("MTU value of %" PRIu16 " too small. Using default MTU value of %d instead.", lease->mtu, DHCP_DEFAULT_MIN_SIZE);
 663                         lease->mtu = DHCP_DEFAULT_MIN_SIZE;
 664                 }
 665
 666                 break;
 667
 668         case SD_DHCP_OPTION_DOMAIN_NAME:
 669                 r = lease_parse_domain(option, len, &lease->domainname);
 670                 if (r < 0) {
 671                         log_debug_errno(r, "Failed to parse domain name, ignoring: %m");
 672                         return 0;
 673                 }
 674
 675                 break;
 676
 677         case SD_DHCP_OPTION_DOMAIN_SEARCH_LIST:
 678                 r = dhcp_lease_parse_search_domains(option, len, &lease->search_domains);
 679                 if (r < 0)
 680                         log_debug_errno(r, "Failed to parse Domain Search List, ignoring: %m");
 681                 break;
 682
 683         case SD_DHCP_OPTION_HOST_NAME:
 684                 r = lease_parse_domain(option, len, &lease->hostname);
 685                 if (r < 0) {
 686                         log_debug_errno(r, "Failed to parse hostname, ignoring: %m");
 687                         return 0;
 688                 }
 689
 690                 break;
 691
 692         case SD_DHCP_OPTION_ROOT_PATH:
 693                 r = lease_parse_string(option, len, &lease->root_path);
 694                 if (r < 0)
 695                         log_debug_errno(r, "Failed to parse root path, ignoring: %m");
 696                 break;
 697
 698         case SD_DHCP_OPTION_RENEWAL_T1_TIME:
 699                 r = lease_parse_u32(option, len, &lease->t1, 1);
 700                 if (r < 0)
 701                         log_debug_errno(r, "Failed to parse T1 time, ignoring: %m");
 702                 break;
 703
 704         case SD_DHCP_OPTION_REBINDING_T2_TIME:
 705                 r = lease_parse_u32(option, len, &lease->t2, 1);
 706                 if (r < 0)
 707                         log_debug_errno(r, "Failed to parse T2 time, ignoring: %m");
 708                 break;
 709
 710         case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
 711                 r = lease_parse_classless_routes(
 712                                 option, len,
 713                                 &lease->static_route,
 714                                 &lease->static_route_size,
 715                                 &lease->static_route_allocated);
 716                 if (r < 0)
 717                         log_debug_errno(r, "Failed to parse classless routes, ignoring: %m");
 718                 break;
 719
 720         case SD_DHCP_OPTION_NEW_TZDB_TIMEZONE: {
 721                 _cleanup_free_ char *tz = NULL;
 722
 723                 r = lease_parse_string(option, len, &tz);
 724                 if (r < 0) {
 725                         log_debug_errno(r, "Failed to parse timezone option, ignoring: %m");
 726                         return 0;
 727                 }
 728
 729                 if (!timezone_is_valid(tz, LOG_DEBUG)) {
 730                         log_debug_errno(r, "Timezone is not valid, ignoring: %m");
 731                         return 0;
 732                 }
 733
 734                 free_and_replace(lease->timezone, tz);
 735
 736                 break;
 737         }
 738
 739         case SD_DHCP_OPTION_VENDOR_SPECIFIC:
 740
 741                 if (len <= 0)
 742                         lease->vendor_specific = mfree(lease->vendor_specific);
 743                 else {
 744                         void *p;
 745
 746                         p = memdup(option, len);
 747                         if (!p)
 748                                 return -ENOMEM;
 749
 750                         free(lease->vendor_specific);
 751                         lease->vendor_specific = p;
 752                 }
 753
 754                 lease->vendor_specific_len = len;
 755                 break;
 756
 757         case SD_DHCP_OPTION_PRIVATE_BASE ... SD_DHCP_OPTION_PRIVATE_LAST:
 758                 r = dhcp_lease_insert_private_option(lease, code, option, len);
 759                 if (r < 0)
 760                         return r;
 761
 762                 break;
 763
 764         default:
 765                 log_debug("Ignoring option DHCP option %"PRIu8" while parsing.", code);
 766                 break;
 767         }
 768
 769         return 0;
 770 }
 771
 772 /* Parses compressed domain names. */
 773 int dhcp_lease_parse_search_domains(const uint8_t *option, size_t len, char ***domains) {
 774         _cleanup_strv_free_ char **names = NULL;
 775         size_t pos = 0, cnt = 0;
 776         int r;
 777
 778         assert(domains);
 779         assert_return(option && len > 0, -ENODATA);
 780
 781         while (pos < len) {
 782                 _cleanup_free_ char *name = NULL;
 783                 size_t n = 0, allocated = 0;
 784                 size_t jump_barrier = pos, next_chunk = 0;
 785                 bool first = true;
 786
 787                 for (;;) {
 788                         uint8_t c;
 789                         c = option[pos++];
 790
 791                         if (c == 0) {
 792                                 /* End of name */
 793                                 break;
 794                         } else if (c <= 63) {
 795                                 const char *label;
 796
 797                                 /* Literal label */
 798                                 label = (const char*) (option + pos);
 799                                 pos += c;
 800                                 if (pos >= len)
 801                                         return -EBADMSG;
 802
 803                                 if (!GREEDY_REALLOC(name, allocated, n + !first + DNS_LABEL_ESCAPED_MAX))
 804                                         return -ENOMEM;
 805
 806                                 if (first)
 807                                         first = false;
 808                                 else
 809                                         name[n++] = '.';
 810
 811                                 r = dns_label_escape(label, c, name + n, DNS_LABEL_ESCAPED_MAX);
 812                                 if (r < 0)
 813                                         return r;
 814
 815                                 n += r;
 816                         } else if ((c & 0xc0) == 0xc0) {
 817                                 /* Pointer */
 818
 819                                 uint8_t d;
 820                                 uint16_t ptr;
 821
 822                                 if (pos >= len)
 823                                         return -EBADMSG;
 824
 825                                 d = option[pos++];
 826                                 ptr = (uint16_t) (c & ~0xc0) << 8 | (uint16_t) d;
 827
 828                                 /* Jumps are limited to a "prior occurrence" (RFC-1035 4.1.4) */
 829                                 if (ptr >= jump_barrier)
 830                                         return -EBADMSG;
 831                                 jump_barrier = ptr;
 832
 833                                 /* Save current location so we don't end up re-parsing what's parsed so far. */
 834                                 if (next_chunk == 0)
 835                                         next_chunk = pos;
 836
 837                                 pos = ptr;
 838                         } else
 839                                 return -EBADMSG;
 840                 }
 841
 842                 if (!GREEDY_REALLOC(name, allocated, n + 1))
 843                         return -ENOMEM;
 844                 name[n] = 0;
 845
 846                 r = strv_extend(&names, name);
 847                 if (r < 0)
 848                         return r;
 849
 850                 cnt++;
 851
 852                 if (next_chunk != 0)
 853                       pos = next_chunk;
 854         }
 855
 856         *domains = TAKE_PTR(names);
 857
 858         return cnt;
 859 }
 860
 861 int dhcp_lease_insert_private_option(sd_dhcp_lease *lease, uint8_t tag, const void *data, uint8_t len) {
 862         struct sd_dhcp_raw_option *cur, *option;
 863
 864         assert(lease);
 865
 866         LIST_FOREACH(options, cur, lease->private_options) {
 867                 if (tag < cur->tag)
 868                         break;
 869                 if (tag == cur->tag) {
 870                         log_debug("Ignoring duplicate option, tagged %i.", tag);
 871                         return 0;
 872                 }
 873         }
 874
 875         option = new(struct sd_dhcp_raw_option, 1);
 876         if (!option)
 877                 return -ENOMEM;
 878
 879         option->tag = tag;
 880         option->length = len;
 881         option->data = memdup(data, len);
 882         if (!option->data) {
 883                 free(option);
 884                 return -ENOMEM;
 885         }
 886
 887         LIST_INSERT_BEFORE(options, lease->private_options, cur, option);
 888         return 0;
 889 }
 890
 891 int dhcp_lease_new(sd_dhcp_lease **ret) {
 892         sd_dhcp_lease *lease;
 893
 894         lease = new0(sd_dhcp_lease, 1);
 895         if (!lease)
 896                 return -ENOMEM;
 897
 898         lease->n_ref = 1;
 899
 900         *ret = lease;
 901         return 0;
 902 }
 903
 904 int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) {
 905         _cleanup_free_ char *temp_path = NULL;
 906         _cleanup_fclose_ FILE *f = NULL;
 907         struct sd_dhcp_raw_option *option;
 908         struct in_addr address;
 909         const struct in_addr *addresses;
 910         const void *client_id, *data;
 911         size_t client_id_len, data_len;
 912         char sbuf[INET_ADDRSTRLEN];
 913         const char *string;
 914         uint16_t mtu;
 915         _cleanup_free_ sd_dhcp_route **routes = NULL;
 916         char **search_domains = NULL;
 917         uint32_t t1, t2, lifetime;
 918         int r;
 919
 920         assert(lease);
 921         assert(lease_file);
 922
 923         r = fopen_temporary(lease_file, &f, &temp_path);
 924         if (r < 0)
 925                 goto fail;
 926
 927         (void) fchmod(fileno(f), 0644);
 928
 929         fprintf(f,
 930                 "# This is private data. Do not parse.\n");
 931
 932         r = sd_dhcp_lease_get_address(lease, &address);
 933         if (r >= 0)
 934                 fprintf(f, "ADDRESS=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 935
 936         r = sd_dhcp_lease_get_netmask(lease, &address);
 937         if (r >= 0)
 938                 fprintf(f, "NETMASK=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 939
 940         r = sd_dhcp_lease_get_router(lease, &addresses);
 941         if (r > 0) {
 942                 fputs("ROUTER=", f);
 943                 serialize_in_addrs(f, addresses, r, false, NULL);
 944                 fputc('\n', f);
 945         }
 946
 947         r = sd_dhcp_lease_get_server_identifier(lease, &address);
 948         if (r >= 0)
 949                 fprintf(f, "SERVER_ADDRESS=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 950
 951         r = sd_dhcp_lease_get_next_server(lease, &address);
 952         if (r >= 0)
 953                 fprintf(f, "NEXT_SERVER=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 954
 955         r = sd_dhcp_lease_get_broadcast(lease, &address);
 956         if (r >= 0)
 957                 fprintf(f, "BROADCAST=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 958
 959         r = sd_dhcp_lease_get_mtu(lease, &mtu);
 960         if (r >= 0)
 961                 fprintf(f, "MTU=%" PRIu16 "\n", mtu);
 962
 963         r = sd_dhcp_lease_get_t1(lease, &t1);
 964         if (r >= 0)
 965                 fprintf(f, "T1=%" PRIu32 "\n", t1);
 966
 967         r = sd_dhcp_lease_get_t2(lease, &t2);
 968         if (r >= 0)
 969                 fprintf(f, "T2=%" PRIu32 "\n", t2);
 970
 971         r = sd_dhcp_lease_get_lifetime(lease, &lifetime);
 972         if (r >= 0)
 973                 fprintf(f, "LIFETIME=%" PRIu32 "\n", lifetime);
 974
 975         r = sd_dhcp_lease_get_dns(lease, &addresses);
 976         if (r > 0) {
 977                 fputs("DNS=", f);
 978                 serialize_in_addrs(f, addresses, r, false, NULL);
 979                 fputc('\n', f);
 980         }
 981
 982         r = sd_dhcp_lease_get_ntp(lease, &addresses);
 983         if (r > 0) {
 984                 fputs("NTP=", f);
 985                 serialize_in_addrs(f, addresses, r, false, NULL);
 986                 fputc('\n', f);
 987         }
 988
 989         r = sd_dhcp_lease_get_sip(lease, &addresses);
 990         if (r > 0) {
 991                 fputs("SIP=", f);
 992                 serialize_in_addrs(f, addresses, r, false, NULL);
 993                 fputc('\n', f);
 994         }
 995
 996         r = sd_dhcp_lease_get_domainname(lease, &string);
 997         if (r >= 0)
 998                 fprintf(f, "DOMAINNAME=%s\n", string);
 999
1000         r = sd_dhcp_lease_get_search_domains(lease, &search_domains);
1001         if (r > 0) {
1002                 fputs("DOMAIN_SEARCH_LIST=", f);
1003                 fputstrv(f, search_domains, NULL, NULL);
1004                 fputc('\n', f);
1005         }
1006
1007         r = sd_dhcp_lease_get_hostname(lease, &string);
1008         if (r >= 0)
1009                 fprintf(f, "HOSTNAME=%s\n", string);
1010
1011         r = sd_dhcp_lease_get_root_path(lease, &string);
1012         if (r >= 0)
1013                 fprintf(f, "ROOT_PATH=%s\n", string);
1014
1015         r = sd_dhcp_lease_get_routes(lease, &routes);
1016         if (r > 0)
1017                 serialize_dhcp_routes(f, "ROUTES", routes, r);
1018
1019         r = sd_dhcp_lease_get_timezone(lease, &string);
1020         if (r >= 0)
1021                 fprintf(f, "TIMEZONE=%s\n", string);
1022
1023         r = sd_dhcp_lease_get_client_id(lease, &client_id, &client_id_len);
1024         if (r >= 0) {
1025                 _cleanup_free_ char *client_id_hex = NULL;
1026
1027                 client_id_hex = hexmem(client_id, client_id_len);
1028                 if (!client_id_hex) {
1029                         r = -ENOMEM;
1030                         goto fail;
1031                 }
1032                 fprintf(f, "CLIENTID=%s\n", client_id_hex);
1033         }
1034
1035         r = sd_dhcp_lease_get_vendor_specific(lease, &data, &data_len);
1036         if (r >= 0) {
1037                 _cleanup_free_ char *option_hex = NULL;
1038
1039                 option_hex = hexmem(data, data_len);
1040                 if (!option_hex) {
1041                         r = -ENOMEM;
1042                         goto fail;
1043                 }
1044                 fprintf(f, "VENDOR_SPECIFIC=%s\n", option_hex);
1045         }
1046
1047         LIST_FOREACH(options, option, lease->private_options) {
1048                 char key[STRLEN("OPTION_000")+1];
1049
1050                 xsprintf(key, "OPTION_%" PRIu8, option->tag);
1051                 r = serialize_dhcp_option(f, key, option->data, option->length);
1052                 if (r < 0)
1053                         goto fail;
1054         }
1055
1056         r = fflush_and_check(f);
1057         if (r < 0)
1058                 goto fail;
1059
1060         if (rename(temp_path, lease_file) < 0) {
1061                 r = -errno;
1062                 goto fail;
1063         }
1064
1065         return 0;
1066
1067 fail:
1068         if (temp_path)
1069                 (void) unlink(temp_path);
1070
1071         return log_error_errno(r, "Failed to save lease data %s: %m", lease_file);
1072 }
1073
1074 int dhcp_lease_load(sd_dhcp_lease **ret, const char *lease_file) {
1075
1076         _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL;
1077         _cleanup_free_ char
1078                 *address = NULL,
1079                 *router = NULL,
1080                 *netmask = NULL,
1081                 *server_address = NULL,
1082                 *next_server = NULL,
1083                 *broadcast = NULL,
1084                 *dns = NULL,
1085                 *ntp = NULL,
1086                 *sip = NULL,
1087                 *pop3_server = NULL,
1088                 *smtp_server = NULL,
1089                 *mtu = NULL,
1090                 *routes = NULL,
1091                 *domains = NULL,
1092                 *client_id_hex = NULL,
1093                 *vendor_specific_hex = NULL,
1094                 *lifetime = NULL,
1095                 *t1 = NULL,
1096                 *t2 = NULL,
1097                 *options[SD_DHCP_OPTION_PRIVATE_LAST - SD_DHCP_OPTION_PRIVATE_BASE + 1] = {};
1098
1099         int r, i;
1100
1101         assert(lease_file);
1102         assert(ret);
1103
1104         r = dhcp_lease_new(&lease);
1105         if (r < 0)
1106                 return r;
1107
1108         r = parse_env_file(NULL, lease_file,
1109                            "ADDRESS", &address,
1110                            "ROUTER", &router,
1111                            "NETMASK", &netmask,
1112                            "SERVER_IDENTIFIER", &server_address,
1113                            "NEXT_SERVER", &next_server,
1114                            "BROADCAST", &broadcast,
1115                            "DNS", &dns,
1116                            "NTP", &ntp,
1117                            "SIP", &sip,
1118                            "POP3_SERVERS", &pop3_server,
1119                            "SMTP_SERVERS", &smtp_server,
1120                            "MTU", &mtu,
1121                            "DOMAINNAME", &lease->domainname,
1122                            "HOSTNAME", &lease->hostname,
1123                            "DOMAIN_SEARCH_LIST", &domains,
1124                            "ROOT_PATH", &lease->root_path,
1125                            "ROUTES", &routes,
1126                            "CLIENTID", &client_id_hex,
1127                            "TIMEZONE", &lease->timezone,
1128                            "VENDOR_SPECIFIC", &vendor_specific_hex,
1129                            "LIFETIME", &lifetime,
1130                            "T1", &t1,
1131                            "T2", &t2,
1132                            "OPTION_224", &options[0],
1133                            "OPTION_225", &options[1],
1134                            "OPTION_226", &options[2],
1135                            "OPTION_227", &options[3],
1136                            "OPTION_228", &options[4],
1137                            "OPTION_229", &options[5],
1138                            "OPTION_230", &options[6],
1139                            "OPTION_231", &options[7],
1140                            "OPTION_232", &options[8],
1141                            "OPTION_233", &options[9],
1142                            "OPTION_234", &options[10],
1143                            "OPTION_235", &options[11],
1144                            "OPTION_236", &options[12],
1145                            "OPTION_237", &options[13],
1146                            "OPTION_238", &options[14],
1147                            "OPTION_239", &options[15],
1148                            "OPTION_240", &options[16],
1149                            "OPTION_241", &options[17],
1150                            "OPTION_242", &options[18],
1151                            "OPTION_243", &options[19],
1152                            "OPTION_244", &options[20],
1153                            "OPTION_245", &options[21],
1154                            "OPTION_246", &options[22],
1155                            "OPTION_247", &options[23],
1156                            "OPTION_248", &options[24],
1157                            "OPTION_249", &options[25],
1158                            "OPTION_250", &options[26],
1159                            "OPTION_251", &options[27],
1160                            "OPTION_252", &options[28],
1161                            "OPTION_253", &options[29],
1162                            "OPTION_254", &options[30]);
1163         if (r < 0)
1164                 return r;
1165
1166         if (address) {
1167                 r = inet_pton(AF_INET, address, &lease->address);
1168                 if (r <= 0)
1169                         log_debug("Failed to parse address %s, ignoring.", address);
1170         }
1171
1172         if (router) {
1173                 r = deserialize_in_addrs(&lease->router, router);
1174                 if (r < 0)
1175                         log_debug_errno(r, "Failed to deserialize router addresses %s, ignoring: %m", router);
1176                 else
1177                         lease->router_size = r;
1178         }
1179
1180         if (netmask) {
1181                 r = inet_pton(AF_INET, netmask, &lease->subnet_mask);
1182                 if (r <= 0)
1183                         log_debug("Failed to parse netmask %s, ignoring.", netmask);
1184                 else
1185                         lease->have_subnet_mask = true;
1186         }
1187
1188         if (server_address) {
1189                 r = inet_pton(AF_INET, server_address, &lease->server_address);
1190                 if (r <= 0)
1191                         log_debug("Failed to parse server address %s, ignoring.", server_address);
1192         }
1193
1194         if (next_server) {
1195                 r = inet_pton(AF_INET, next_server, &lease->next_server);
1196                 if (r <= 0)
1197                         log_debug("Failed to parse next server %s, ignoring.", next_server);
1198         }
1199
1200         if (broadcast) {
1201                 r = inet_pton(AF_INET, broadcast, &lease->broadcast);
1202                 if (r <= 0)
1203                         log_debug("Failed to parse broadcast address %s, ignoring.", broadcast);
1204                 else
1205                         lease->have_broadcast = true;
1206         }
1207
1208         if (dns) {
1209                 r = deserialize_in_addrs(&lease->dns, dns);
1210                 if (r < 0)
1211                         log_debug_errno(r, "Failed to deserialize DNS servers %s, ignoring: %m", dns);
1212                 else
1213                         lease->dns_size = r;
1214         }
1215
1216         if (ntp) {
1217                 r = deserialize_in_addrs(&lease->ntp, ntp);
1218                 if (r < 0)
1219                         log_debug_errno(r, "Failed to deserialize NTP servers %s, ignoring: %m", ntp);
1220                 else
1221                         lease->ntp_size = r;
1222         }
1223
1224         if (sip) {
1225                 r = deserialize_in_addrs(&lease->sip, sip);
1226                 if (r < 0)
1227                         log_debug_errno(r, "Failed to deserialize SIP servers %s, ignoring: %m", sip);
1228                 else
1229                         lease->sip_size = r;
1230         }
1231
1232         if (pop3_server) {
1233                 r = deserialize_in_addrs(&lease->pop3_server, pop3_server);
1234                 if (r < 0)
1235                         log_debug_errno(r, "Failed to deserialize POP3 server %s, ignoring: %m", pop3_server);
1236                 else
1237                         lease->pop3_server_size = r;
1238         }
1239
1240         if (smtp_server) {
1241                 r = deserialize_in_addrs(&lease->smtp_server, smtp_server);
1242                 if (r < 0)
1243                         log_debug_errno(r, "Failed to deserialize SMTP server %s, ignoring: %m", smtp_server);
1244                 else
1245                         lease->smtp_server_size = r;
1246         }
1247
1248         if (mtu) {
1249                 r = safe_atou16(mtu, &lease->mtu);
1250                 if (r < 0)
1251                         log_debug_errno(r, "Failed to parse MTU %s, ignoring: %m", mtu);
1252         }
1253
1254         if (domains) {
1255                 _cleanup_strv_free_ char **a = NULL;
1256                 a = strv_split(domains, " ");
1257                 if (!a)
1258                         return -ENOMEM;
1259
1260                 if (!strv_isempty(a)) {
1261                         lease->search_domains = a;
1262                         a = NULL;
1263                 }
1264         }
1265
1266         if (routes) {
1267                 r = deserialize_dhcp_routes(
1268                                 &lease->static_route,
1269                                 &lease->static_route_size,
1270                                 &lease->static_route_allocated,
1271                                 routes);
1272                 if (r < 0)
1273                         log_debug_errno(r, "Failed to parse DHCP routes %s, ignoring: %m", routes);
1274         }
1275
1276         if (lifetime) {
1277                 r = safe_atou32(lifetime, &lease->lifetime);
1278                 if (r < 0)
1279                         log_debug_errno(r, "Failed to parse lifetime %s, ignoring: %m", lifetime);
1280         }
1281
1282         if (t1) {
1283                 r = safe_atou32(t1, &lease->t1);
1284                 if (r < 0)
1285                         log_debug_errno(r, "Failed to parse T1 %s, ignoring: %m", t1);
1286         }
1287
1288         if (t2) {
1289                 r = safe_atou32(t2, &lease->t2);
1290                 if (r < 0)
1291                         log_debug_errno(r, "Failed to parse T2 %s, ignoring: %m", t2);
1292         }
1293
1294         if (client_id_hex) {
1295                 r = unhexmem(client_id_hex, (size_t) -1, &lease->client_id, &lease->client_id_len);
1296                 if (r < 0)
1297                         log_debug_errno(r, "Failed to parse client ID %s, ignoring: %m", client_id_hex);
1298         }
1299
1300         if (vendor_specific_hex) {
1301                 r = unhexmem(vendor_specific_hex, (size_t) -1, &lease->vendor_specific, &lease->vendor_specific_len);
1302                 if (r < 0)
1303                         log_debug_errno(r, "Failed to parse vendor specific data %s, ignoring: %m", vendor_specific_hex);
1304         }
1305
1306         for (i = 0; i <= SD_DHCP_OPTION_PRIVATE_LAST - SD_DHCP_OPTION_PRIVATE_BASE; i++) {
1307                 _cleanup_free_ void *data = NULL;
1308                 size_t len;
1309
1310                 if (!options[i])
1311                         continue;
1312
1313                 r = unhexmem(options[i], (size_t) -1, &data, &len);
1314                 if (r < 0) {
1315                         log_debug_errno(r, "Failed to parse private DHCP option %s, ignoring: %m", options[i]);
1316                         continue;
1317                 }
1318
1319                 r = dhcp_lease_insert_private_option(lease, SD_DHCP_OPTION_PRIVATE_BASE + i, data, len);
1320                 if (r < 0)
1321                         return r;
1322         }
1323
1324         *ret = TAKE_PTR(lease);
1325
1326         return 0;
1327 }
1328
1329 int dhcp_lease_set_default_subnet_mask(sd_dhcp_lease *lease) {
1330         struct in_addr address, mask;
1331         int r;
1332
1333         assert(lease);
1334
1335         if (lease->address == 0)
1336                 return -ENODATA;
1337
1338         address.s_addr = lease->address;
1339
1340         /* fall back to the default subnet masks based on address class */
1341         r = in4_addr_default_subnet_mask(&address, &mask);
1342         if (r < 0)
1343                 return r;
1344
1345         lease->subnet_mask = mask.s_addr;
1346         lease->have_subnet_mask = true;
1347
1348         return 0;
1349 }
1350
1351 int sd_dhcp_lease_get_client_id(sd_dhcp_lease *lease, const void **client_id, size_t *client_id_len) {
1352         assert_return(lease, -EINVAL);
1353         assert_return(client_id, -EINVAL);
1354         assert_return(client_id_len, -EINVAL);
1355
1356         if (!lease->client_id)
1357                 return -ENODATA;
1358
1359         *client_id = lease->client_id;
1360         *client_id_len = lease->client_id_len;
1361
1362         return 0;
1363 }
1364
1365 int dhcp_lease_set_client_id(sd_dhcp_lease *lease, const void *client_id, size_t client_id_len) {
1366         assert_return(lease, -EINVAL);
1367         assert_return(client_id || client_id_len <= 0, -EINVAL);
1368
1369         if (client_id_len <= 0)
1370                 lease->client_id = mfree(lease->client_id);
1371         else {
1372                 void *p;
1373
1374                 p = memdup(client_id, client_id_len);
1375                 if (!p)
1376                         return -ENOMEM;
1377
1378                 free(lease->client_id);
1379                 lease->client_id = p;
1380                 lease->client_id_len = client_id_len;
1381         }
1382
1383         return 0;
1384 }
1385
1386 int sd_dhcp_lease_get_timezone(sd_dhcp_lease *lease, const char **tz) {
1387         assert_return(lease, -EINVAL);
1388         assert_return(tz, -EINVAL);
1389
1390         if (!lease->timezone)
1391                 return -ENODATA;
1392
1393         *tz = lease->timezone;
1394         return 0;
1395 }
1396
1397 int sd_dhcp_route_get_destination(sd_dhcp_route *route, struct in_addr *destination) {
1398         assert_return(route, -EINVAL);
1399         assert_return(destination, -EINVAL);
1400
1401         *destination = route->dst_addr;
1402         return 0;
1403 }
1404
1405 int sd_dhcp_route_get_destination_prefix_length(sd_dhcp_route *route, uint8_t *length) {
1406         assert_return(route, -EINVAL);
1407         assert_return(length, -EINVAL);
1408
1409         *length = route->dst_prefixlen;
1410         return 0;
1411 }
1412
1413 int sd_dhcp_route_get_gateway(sd_dhcp_route *route, struct in_addr *gateway) {
1414         assert_return(route, -EINVAL);
1415         assert_return(gateway, -EINVAL);
1416
1417         *gateway = route->gw_addr;
1418         return 0;
1419 }
1420
1421 int sd_dhcp_route_get_option(sd_dhcp_route *route) {
1422         assert_return(route, -EINVAL);
1423
1424         return route->option;
1425 }