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_server_type what,
 102                 const struct in_addr **addr) {
 103
 104         assert_return(lease, -EINVAL);
 105         assert_return(what >= 0, -EINVAL);
 106         assert_return(what < _SD_DHCP_LEASE_SERVER_TYPE_MAX, -EINVAL);
 107         assert_return(addr, -EINVAL);
 108
 109         if (lease->servers[what].size <= 0)
 110                 return -ENODATA;
 111
 112         *addr = lease->servers[what].addr;
 113         return (int) lease->servers[what].size;
 114 }
 115
 116 int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, const struct in_addr **addr) {
 117         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_DNS, addr);
 118 }
 119 int sd_dhcp_lease_get_ntp(sd_dhcp_lease *lease, const struct in_addr **addr) {
 120         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_NTP, addr);
 121 }
 122 int sd_dhcp_lease_get_sip(sd_dhcp_lease *lease, const struct in_addr **addr) {
 123         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_SIP, addr);
 124 }
 125 int sd_dhcp_lease_get_pop3(sd_dhcp_lease *lease, const struct in_addr **addr) {
 126         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_POP3, addr);
 127 }
 128 int sd_dhcp_lease_get_smtp(sd_dhcp_lease *lease, const struct in_addr **addr) {
 129         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_SMTP, addr);
 130 }
 131 int sd_dhcp_lease_get_lpr(sd_dhcp_lease *lease, const struct in_addr **addr) {
 132         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_LPR, addr);
 133 }
 134
 135 int sd_dhcp_lease_get_domainname(sd_dhcp_lease *lease, const char **domainname) {
 136         assert_return(lease, -EINVAL);
 137         assert_return(domainname, -EINVAL);
 138
 139         if (!lease->domainname)
 140                 return -ENODATA;
 141
 142         *domainname = lease->domainname;
 143         return 0;
 144 }
 145
 146 int sd_dhcp_lease_get_hostname(sd_dhcp_lease *lease, const char **hostname) {
 147         assert_return(lease, -EINVAL);
 148         assert_return(hostname, -EINVAL);
 149
 150         if (!lease->hostname)
 151                 return -ENODATA;
 152
 153         *hostname = lease->hostname;
 154         return 0;
 155 }
 156
 157 int sd_dhcp_lease_get_root_path(sd_dhcp_lease *lease, const char **root_path) {
 158         assert_return(lease, -EINVAL);
 159         assert_return(root_path, -EINVAL);
 160
 161         if (!lease->root_path)
 162                 return -ENODATA;
 163
 164         *root_path = lease->root_path;
 165         return 0;
 166 }
 167
 168 int sd_dhcp_lease_get_router(sd_dhcp_lease *lease, const struct in_addr **addr) {
 169         assert_return(lease, -EINVAL);
 170         assert_return(addr, -EINVAL);
 171
 172         if (lease->router_size <= 0)
 173                 return -ENODATA;
 174
 175         *addr = lease->router;
 176         return (int) lease->router_size;
 177 }
 178
 179 int sd_dhcp_lease_get_netmask(sd_dhcp_lease *lease, struct in_addr *addr) {
 180         assert_return(lease, -EINVAL);
 181         assert_return(addr, -EINVAL);
 182
 183         if (!lease->have_subnet_mask)
 184                 return -ENODATA;
 185
 186         addr->s_addr = lease->subnet_mask;
 187         return 0;
 188 }
 189
 190 int sd_dhcp_lease_get_server_identifier(sd_dhcp_lease *lease, struct in_addr *addr) {
 191         assert_return(lease, -EINVAL);
 192         assert_return(addr, -EINVAL);
 193
 194         if (lease->server_address == 0)
 195                 return -ENODATA;
 196
 197         addr->s_addr = lease->server_address;
 198         return 0;
 199 }
 200
 201 int sd_dhcp_lease_get_next_server(sd_dhcp_lease *lease, struct in_addr *addr) {
 202         assert_return(lease, -EINVAL);
 203         assert_return(addr, -EINVAL);
 204
 205         if (lease->next_server == 0)
 206                 return -ENODATA;
 207
 208         addr->s_addr = lease->next_server;
 209         return 0;
 210 }
 211
 212 /*
 213  * The returned routes array must be freed by the caller.
 214  * Route objects have the same lifetime of the lease and must not be freed.
 215  */
 216 int sd_dhcp_lease_get_routes(sd_dhcp_lease *lease, sd_dhcp_route ***routes) {
 217         sd_dhcp_route **ret;
 218         unsigned i;
 219
 220         assert_return(lease, -EINVAL);
 221         assert_return(routes, -EINVAL);
 222
 223         if (lease->static_route_size <= 0)
 224                 return -ENODATA;
 225
 226         ret = new(sd_dhcp_route *, lease->static_route_size);
 227         if (!ret)
 228                 return -ENOMEM;
 229
 230         for (i = 0; i < lease->static_route_size; i++)
 231                 ret[i] = &lease->static_route[i];
 232
 233         *routes = ret;
 234         return (int) lease->static_route_size;
 235 }
 236
 237 int sd_dhcp_lease_get_search_domains(sd_dhcp_lease *lease, char ***domains) {
 238         size_t r;
 239
 240         assert_return(lease, -EINVAL);
 241         assert_return(domains, -EINVAL);
 242
 243         r = strv_length(lease->search_domains);
 244         if (r > 0) {
 245                 *domains = lease->search_domains;
 246                 return (int) r;
 247         }
 248
 249         return -ENODATA;
 250 }
 251
 252 int sd_dhcp_lease_get_vendor_specific(sd_dhcp_lease *lease, const void **data, size_t *data_len) {
 253         assert_return(lease, -EINVAL);
 254         assert_return(data, -EINVAL);
 255         assert_return(data_len, -EINVAL);
 256
 257         if (lease->vendor_specific_len <= 0)
 258                 return -ENODATA;
 259
 260         *data = lease->vendor_specific;
 261         *data_len = lease->vendor_specific_len;
 262         return 0;
 263 }
 264
 265 static sd_dhcp_lease *dhcp_lease_free(sd_dhcp_lease *lease) {
 266         assert(lease);
 267
 268         while (lease->private_options) {
 269                 struct sd_dhcp_raw_option *option = lease->private_options;
 270
 271                 LIST_REMOVE(options, lease->private_options, option);
 272
 273                 free(option->data);
 274                 free(option);
 275         }
 276
 277         free(lease->root_path);
 278         free(lease->router);
 279         free(lease->timezone);
 280         free(lease->hostname);
 281         free(lease->domainname);
 282
 283         for (sd_dhcp_lease_server_type i = 0; i < _SD_DHCP_LEASE_SERVER_TYPE_MAX; i++)
 284                 free(lease->servers[i].addr);
 285
 286         free(lease->static_route);
 287         free(lease->client_id);
 288         free(lease->vendor_specific);
 289         strv_free(lease->search_domains);
 290         return mfree(lease);
 291 }
 292
 293 DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_lease, sd_dhcp_lease, dhcp_lease_free);
 294
 295 static int lease_parse_u32(const uint8_t *option, size_t len, uint32_t *ret, uint32_t min) {
 296         assert(option);
 297         assert(ret);
 298
 299         if (len != 4)
 300                 return -EINVAL;
 301
 302         *ret = unaligned_read_be32((be32_t*) option);
 303         if (*ret < min)
 304                 *ret = min;
 305
 306         return 0;
 307 }
 308
 309 static int lease_parse_u16(const uint8_t *option, size_t len, uint16_t *ret, uint16_t min) {
 310         assert(option);
 311         assert(ret);
 312
 313         if (len != 2)
 314                 return -EINVAL;
 315
 316         *ret = unaligned_read_be16((be16_t*) option);
 317         if (*ret < min)
 318                 *ret = min;
 319
 320         return 0;
 321 }
 322
 323 static int lease_parse_be32(const uint8_t *option, size_t len, be32_t *ret) {
 324         assert(option);
 325         assert(ret);
 326
 327         if (len != 4)
 328                 return -EINVAL;
 329
 330         memcpy(ret, option, 4);
 331         return 0;
 332 }
 333
 334 static int lease_parse_string(const uint8_t *option, size_t len, char **ret) {
 335         assert(option);
 336         assert(ret);
 337
 338         if (len <= 0)
 339                 *ret = mfree(*ret);
 340         else {
 341                 char *string;
 342
 343                 /*
 344                  * One trailing NUL byte is OK, we don't mind. See:
 345                  * https://github.com/systemd/systemd/issues/1337
 346                  */
 347                 if (memchr(option, 0, len - 1))
 348                         return -EINVAL;
 349
 350                 string = memdup_suffix0((const char *) option, len);
 351                 if (!string)
 352                         return -ENOMEM;
 353
 354                 free_and_replace(*ret, string);
 355         }
 356
 357         return 0;
 358 }
 359
 360 static int lease_parse_domain(const uint8_t *option, size_t len, char **ret) {
 361         _cleanup_free_ char *name = NULL, *normalized = NULL;
 362         int r;
 363
 364         assert(option);
 365         assert(ret);
 366
 367         r = lease_parse_string(option, len, &name);
 368         if (r < 0)
 369                 return r;
 370         if (!name) {
 371                 *ret = mfree(*ret);
 372                 return 0;
 373         }
 374
 375         r = dns_name_normalize(name, 0, &normalized);
 376         if (r < 0)
 377                 return r;
 378
 379         if (is_localhost(normalized))
 380                 return -EINVAL;
 381
 382         if (dns_name_is_root(normalized))
 383                 return -EINVAL;
 384
 385         free_and_replace(*ret, normalized);
 386
 387         return 0;
 388 }
 389
 390 static int lease_parse_in_addrs(const uint8_t *option, size_t len, struct in_addr **ret, size_t *n_ret) {
 391         assert(option || len == 0);
 392         assert(ret);
 393         assert(n_ret);
 394
 395         if (len <= 0) {
 396                 *ret = mfree(*ret);
 397                 *n_ret = 0;
 398         } else {
 399                 size_t n_addresses;
 400                 struct in_addr *addresses;
 401
 402                 if (len % 4 != 0)
 403                         return -EINVAL;
 404
 405                 n_addresses = len / 4;
 406
 407                 addresses = newdup(struct in_addr, option, n_addresses);
 408                 if (!addresses)
 409                         return -ENOMEM;
 410
 411                 free(*ret);
 412                 *ret = addresses;
 413                 *n_ret = n_addresses;
 414         }
 415
 416         return 0;
 417 }
 418
 419 static int lease_parse_sip_server(const uint8_t *option, size_t len, struct in_addr **ret, size_t *n_ret) {
 420         assert(option || len == 0);
 421         assert(ret);
 422         assert(n_ret);
 423
 424         if (len <= 0)
 425                 return -EINVAL;
 426
 427         /* The SIP record is like the other, regular server records, but prefixed with a single "encoding"
 428          * byte that is either 0 or 1. We only support it to be 1 for now. Let's drop it and parse it like
 429          * the other fields */
 430
 431         if (option[0] != 1) { /* We only support IP address encoding for now */
 432                 *ret = mfree(*ret);
 433                 *n_ret = 0;
 434                 return 0;
 435         }
 436
 437         return lease_parse_in_addrs(option + 1, len - 1, ret, n_ret);
 438 }
 439
 440 static int lease_parse_routes(
 441                 const uint8_t *option, size_t len,
 442                 struct sd_dhcp_route **routes, size_t *routes_size, size_t *routes_allocated) {
 443
 444         struct in_addr addr;
 445
 446         assert(option || len <= 0);
 447         assert(routes);
 448         assert(routes_size);
 449         assert(routes_allocated);
 450
 451         if (len <= 0)
 452                 return 0;
 453
 454         if (len % 8 != 0)
 455                 return -EINVAL;
 456
 457         if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + (len / 8)))
 458                 return -ENOMEM;
 459
 460         while (len >= 8) {
 461                 struct sd_dhcp_route *route = *routes + *routes_size;
 462                 int r;
 463
 464                 route->option = SD_DHCP_OPTION_STATIC_ROUTE;
 465                 r = in4_addr_default_prefixlen((struct in_addr*) option, &route->dst_prefixlen);
 466                 if (r < 0) {
 467                         log_debug("Failed to determine destination prefix length from class based IP, ignoring");
 468                         continue;
 469                 }
 470
 471                 assert_se(lease_parse_be32(option, 4, &addr.s_addr) >= 0);
 472                 route->dst_addr = inet_makeaddr(inet_netof(addr), 0);
 473                 option += 4;
 474
 475                 assert_se(lease_parse_be32(option, 4, &route->gw_addr.s_addr) >= 0);
 476                 option += 4;
 477
 478                 len -= 8;
 479                 (*routes_size)++;
 480         }
 481
 482         return 0;
 483 }
 484
 485 /* parses RFC3442 Classless Static Route Option */
 486 static int lease_parse_classless_routes(
 487                 const uint8_t *option, size_t len,
 488                 struct sd_dhcp_route **routes, size_t *routes_size, size_t *routes_allocated) {
 489
 490         assert(option || len <= 0);
 491         assert(routes);
 492         assert(routes_size);
 493         assert(routes_allocated);
 494
 495         if (len <= 0)
 496                 return 0;
 497
 498         /* option format: (subnet-mask-width significant-subnet-octets gateway-ip)*  */
 499
 500         while (len > 0) {
 501                 uint8_t dst_octets;
 502                 struct sd_dhcp_route *route;
 503
 504                 if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + 1))
 505                         return -ENOMEM;
 506
 507                 route = *routes + *routes_size;
 508                 route->option = SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE;
 509
 510                 dst_octets = (*option == 0 ? 0 : ((*option - 1) / 8) + 1);
 511                 route->dst_prefixlen = *option;
 512                 option++;
 513                 len--;
 514
 515                 /* can't have more than 4 octets in IPv4 */
 516                 if (dst_octets > 4 || len < dst_octets)
 517                         return -EINVAL;
 518
 519                 route->dst_addr.s_addr = 0;
 520                 memcpy(&route->dst_addr.s_addr, option, dst_octets);
 521                 option += dst_octets;
 522                 len -= dst_octets;
 523
 524                 if (len < 4)
 525                         return -EINVAL;
 526
 527                 assert_se(lease_parse_be32(option, 4, &route->gw_addr.s_addr) >= 0);
 528                 option += 4;
 529                 len -= 4;
 530
 531                 (*routes_size)++;
 532         }
 533
 534         return 0;
 535 }
 536
 537 int dhcp_lease_parse_options(uint8_t code, uint8_t len, const void *option, void *userdata) {
 538         sd_dhcp_lease *lease = userdata;
 539         int r;
 540
 541         assert(lease);
 542
 543         switch(code) {
 544
 545         case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
 546                 r = lease_parse_u32(option, len, &lease->lifetime, 1);
 547                 if (r < 0)
 548                         log_debug_errno(r, "Failed to parse lease time, ignoring: %m");
 549
 550                 break;
 551
 552         case SD_DHCP_OPTION_SERVER_IDENTIFIER:
 553                 r = lease_parse_be32(option, len, &lease->server_address);
 554                 if (r < 0)
 555                         log_debug_errno(r, "Failed to parse server identifier, ignoring: %m");
 556
 557                 break;
 558
 559         case SD_DHCP_OPTION_SUBNET_MASK:
 560                 r = lease_parse_be32(option, len, &lease->subnet_mask);
 561                 if (r < 0)
 562                         log_debug_errno(r, "Failed to parse subnet mask, ignoring: %m");
 563                 else
 564                         lease->have_subnet_mask = true;
 565                 break;
 566
 567         case SD_DHCP_OPTION_BROADCAST:
 568                 r = lease_parse_be32(option, len, &lease->broadcast);
 569                 if (r < 0)
 570                         log_debug_errno(r, "Failed to parse broadcast address, ignoring: %m");
 571                 else
 572                         lease->have_broadcast = true;
 573                 break;
 574
 575         case SD_DHCP_OPTION_ROUTER:
 576                 r = lease_parse_in_addrs(option, len, &lease->router, &lease->router_size);
 577                 if (r < 0)
 578                         log_debug_errno(r, "Failed to parse router addresses, ignoring: %m");
 579                 break;
 580
 581         case SD_DHCP_OPTION_DOMAIN_NAME_SERVER:
 582                 r = lease_parse_in_addrs(option, len, &lease->servers[SD_DHCP_LEASE_DNS].addr, &lease->servers[SD_DHCP_LEASE_DNS].size);
 583                 if (r < 0)
 584                         log_debug_errno(r, "Failed to parse DNS server, ignoring: %m");
 585                 break;
 586
 587         case SD_DHCP_OPTION_NTP_SERVER:
 588                 r = lease_parse_in_addrs(option, len, &lease->servers[SD_DHCP_LEASE_NTP].addr, &lease->servers[SD_DHCP_LEASE_NTP].size);
 589                 if (r < 0)
 590                         log_debug_errno(r, "Failed to parse NTP server, ignoring: %m");
 591                 break;
 592
 593         case SD_DHCP_OPTION_SIP_SERVER:
 594                 r = lease_parse_sip_server(option, len, &lease->servers[SD_DHCP_LEASE_SIP].addr, &lease->servers[SD_DHCP_LEASE_SIP].size);
 595                 if (r < 0)
 596                         log_debug_errno(r, "Failed to parse SIP server, ignoring: %m");
 597                 break;
 598
 599         case SD_DHCP_OPTION_POP3_SERVER:
 600                 r = lease_parse_in_addrs(option, len, &lease->servers[SD_DHCP_LEASE_POP3].addr, &lease->servers[SD_DHCP_LEASE_POP3].size);
 601                 if (r < 0)
 602                         log_debug_errno(r, "Failed to parse POP3 server, ignoring: %m");
 603                 break;
 604
 605         case SD_DHCP_OPTION_SMTP_SERVER:
 606                 r = lease_parse_in_addrs(option, len, &lease->servers[SD_DHCP_LEASE_SMTP].addr, &lease->servers[SD_DHCP_LEASE_SMTP].size);
 607                 if (r < 0)
 608                         log_debug_errno(r, "Failed to parse SMTP server, ignoring: %m");
 609                 break;
 610
 611         case SD_DHCP_OPTION_LPR_SERVER:
 612                 r = lease_parse_in_addrs(option, len, &lease->servers[SD_DHCP_LEASE_LPR].addr, &lease->servers[SD_DHCP_LEASE_LPR].size);
 613                 if (r < 0)
 614                         log_debug_errno(r, "Failed to parse LPR server, ignoring: %m");
 615                 break;
 616
 617         case SD_DHCP_OPTION_STATIC_ROUTE:
 618                 r = lease_parse_routes(option, len, &lease->static_route, &lease->static_route_size, &lease->static_route_allocated);
 619                 if (r < 0)
 620                         log_debug_errno(r, "Failed to parse static routes, ignoring: %m");
 621                 break;
 622
 623         case SD_DHCP_OPTION_INTERFACE_MTU:
 624                 r = lease_parse_u16(option, len, &lease->mtu, 68);
 625                 if (r < 0)
 626                         log_debug_errno(r, "Failed to parse MTU, ignoring: %m");
 627                 if (lease->mtu < DHCP_DEFAULT_MIN_SIZE) {
 628                         log_debug("MTU value of %" PRIu16 " too small. Using default MTU value of %d instead.", lease->mtu, DHCP_DEFAULT_MIN_SIZE);
 629                         lease->mtu = DHCP_DEFAULT_MIN_SIZE;
 630                 }
 631
 632                 break;
 633
 634         case SD_DHCP_OPTION_DOMAIN_NAME:
 635                 r = lease_parse_domain(option, len, &lease->domainname);
 636                 if (r < 0) {
 637                         log_debug_errno(r, "Failed to parse domain name, ignoring: %m");
 638                         return 0;
 639                 }
 640
 641                 break;
 642
 643         case SD_DHCP_OPTION_DOMAIN_SEARCH_LIST:
 644                 r = dhcp_lease_parse_search_domains(option, len, &lease->search_domains);
 645                 if (r < 0)
 646                         log_debug_errno(r, "Failed to parse Domain Search List, ignoring: %m");
 647                 break;
 648
 649         case SD_DHCP_OPTION_HOST_NAME:
 650                 r = lease_parse_domain(option, len, &lease->hostname);
 651                 if (r < 0) {
 652                         log_debug_errno(r, "Failed to parse hostname, ignoring: %m");
 653                         return 0;
 654                 }
 655
 656                 break;
 657
 658         case SD_DHCP_OPTION_ROOT_PATH:
 659                 r = lease_parse_string(option, len, &lease->root_path);
 660                 if (r < 0)
 661                         log_debug_errno(r, "Failed to parse root path, ignoring: %m");
 662                 break;
 663
 664         case SD_DHCP_OPTION_RENEWAL_T1_TIME:
 665                 r = lease_parse_u32(option, len, &lease->t1, 1);
 666                 if (r < 0)
 667                         log_debug_errno(r, "Failed to parse T1 time, ignoring: %m");
 668                 break;
 669
 670         case SD_DHCP_OPTION_REBINDING_T2_TIME:
 671                 r = lease_parse_u32(option, len, &lease->t2, 1);
 672                 if (r < 0)
 673                         log_debug_errno(r, "Failed to parse T2 time, ignoring: %m");
 674                 break;
 675
 676         case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
 677                 r = lease_parse_classless_routes(
 678                                 option, len,
 679                                 &lease->static_route,
 680                                 &lease->static_route_size,
 681                                 &lease->static_route_allocated);
 682                 if (r < 0)
 683                         log_debug_errno(r, "Failed to parse classless routes, ignoring: %m");
 684                 break;
 685
 686         case SD_DHCP_OPTION_NEW_TZDB_TIMEZONE: {
 687                 _cleanup_free_ char *tz = NULL;
 688
 689                 r = lease_parse_string(option, len, &tz);
 690                 if (r < 0) {
 691                         log_debug_errno(r, "Failed to parse timezone option, ignoring: %m");
 692                         return 0;
 693                 }
 694
 695                 if (!timezone_is_valid(tz, LOG_DEBUG)) {
 696                         log_debug_errno(r, "Timezone is not valid, ignoring: %m");
 697                         return 0;
 698                 }
 699
 700                 free_and_replace(lease->timezone, tz);
 701
 702                 break;
 703         }
 704
 705         case SD_DHCP_OPTION_VENDOR_SPECIFIC:
 706
 707                 if (len <= 0)
 708                         lease->vendor_specific = mfree(lease->vendor_specific);
 709                 else {
 710                         void *p;
 711
 712                         p = memdup(option, len);
 713                         if (!p)
 714                                 return -ENOMEM;
 715
 716                         free(lease->vendor_specific);
 717                         lease->vendor_specific = p;
 718                 }
 719
 720                 lease->vendor_specific_len = len;
 721                 break;
 722
 723         case SD_DHCP_OPTION_PRIVATE_BASE ... SD_DHCP_OPTION_PRIVATE_LAST:
 724                 r = dhcp_lease_insert_private_option(lease, code, option, len);
 725                 if (r < 0)
 726                         return r;
 727
 728                 break;
 729
 730         default:
 731                 log_debug("Ignoring option DHCP option %"PRIu8" while parsing.", code);
 732                 break;
 733         }
 734
 735         return 0;
 736 }
 737
 738 /* Parses compressed domain names. */
 739 int dhcp_lease_parse_search_domains(const uint8_t *option, size_t len, char ***domains) {
 740         _cleanup_strv_free_ char **names = NULL;
 741         size_t pos = 0, cnt = 0;
 742         int r;
 743
 744         assert(domains);
 745         assert_return(option && len > 0, -ENODATA);
 746
 747         while (pos < len) {
 748                 _cleanup_free_ char *name = NULL;
 749                 size_t n = 0, allocated = 0;
 750                 size_t jump_barrier = pos, next_chunk = 0;
 751                 bool first = true;
 752
 753                 for (;;) {
 754                         uint8_t c;
 755                         c = option[pos++];
 756
 757                         if (c == 0) {
 758                                 /* End of name */
 759                                 break;
 760                         } else if (c <= 63) {
 761                                 const char *label;
 762
 763                                 /* Literal label */
 764                                 label = (const char*) (option + pos);
 765                                 pos += c;
 766                                 if (pos >= len)
 767                                         return -EBADMSG;
 768
 769                                 if (!GREEDY_REALLOC(name, allocated, n + !first + DNS_LABEL_ESCAPED_MAX))
 770                                         return -ENOMEM;
 771
 772                                 if (first)
 773                                         first = false;
 774                                 else
 775                                         name[n++] = '.';
 776
 777                                 r = dns_label_escape(label, c, name + n, DNS_LABEL_ESCAPED_MAX);
 778                                 if (r < 0)
 779                                         return r;
 780
 781                                 n += r;
 782                         } else if (FLAGS_SET(c, 0xc0)) {
 783                                 /* Pointer */
 784
 785                                 uint8_t d;
 786                                 uint16_t ptr;
 787
 788                                 if (pos >= len)
 789                                         return -EBADMSG;
 790
 791                                 d = option[pos++];
 792                                 ptr = (uint16_t) (c & ~0xc0) << 8 | (uint16_t) d;
 793
 794                                 /* Jumps are limited to a "prior occurrence" (RFC-1035 4.1.4) */
 795                                 if (ptr >= jump_barrier)
 796                                         return -EBADMSG;
 797                                 jump_barrier = ptr;
 798
 799                                 /* Save current location so we don't end up re-parsing what's parsed so far. */
 800                                 if (next_chunk == 0)
 801                                         next_chunk = pos;
 802
 803                                 pos = ptr;
 804                         } else
 805                                 return -EBADMSG;
 806                 }
 807
 808                 if (!GREEDY_REALLOC(name, allocated, n + 1))
 809                         return -ENOMEM;
 810                 name[n] = 0;
 811
 812                 r = strv_extend(&names, name);
 813                 if (r < 0)
 814                         return r;
 815
 816                 cnt++;
 817
 818                 if (next_chunk != 0)
 819                       pos = next_chunk;
 820         }
 821
 822         *domains = TAKE_PTR(names);
 823
 824         return cnt;
 825 }
 826
 827 int dhcp_lease_insert_private_option(sd_dhcp_lease *lease, uint8_t tag, const void *data, uint8_t len) {
 828         struct sd_dhcp_raw_option *cur, *option;
 829
 830         assert(lease);
 831
 832         LIST_FOREACH(options, cur, lease->private_options) {
 833                 if (tag < cur->tag)
 834                         break;
 835                 if (tag == cur->tag) {
 836                         log_debug("Ignoring duplicate option, tagged %i.", tag);
 837                         return 0;
 838                 }
 839         }
 840
 841         option = new(struct sd_dhcp_raw_option, 1);
 842         if (!option)
 843                 return -ENOMEM;
 844
 845         option->tag = tag;
 846         option->length = len;
 847         option->data = memdup(data, len);
 848         if (!option->data) {
 849                 free(option);
 850                 return -ENOMEM;
 851         }
 852
 853         LIST_INSERT_BEFORE(options, lease->private_options, cur, option);
 854         return 0;
 855 }
 856
 857 int dhcp_lease_new(sd_dhcp_lease **ret) {
 858         sd_dhcp_lease *lease;
 859
 860         lease = new0(sd_dhcp_lease, 1);
 861         if (!lease)
 862                 return -ENOMEM;
 863
 864         lease->n_ref = 1;
 865
 866         *ret = lease;
 867         return 0;
 868 }
 869
 870 int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) {
 871         _cleanup_free_ char *temp_path = NULL;
 872         _cleanup_fclose_ FILE *f = NULL;
 873         struct sd_dhcp_raw_option *option;
 874         struct in_addr address;
 875         const struct in_addr *addresses;
 876         const void *client_id, *data;
 877         size_t client_id_len, data_len;
 878         char sbuf[INET_ADDRSTRLEN];
 879         const char *string;
 880         uint16_t mtu;
 881         _cleanup_free_ sd_dhcp_route **routes = NULL;
 882         char **search_domains = NULL;
 883         uint32_t t1, t2, lifetime;
 884         int r;
 885
 886         assert(lease);
 887         assert(lease_file);
 888
 889         r = fopen_temporary(lease_file, &f, &temp_path);
 890         if (r < 0)
 891                 goto fail;
 892
 893         (void) fchmod(fileno(f), 0644);
 894
 895         fprintf(f,
 896                 "# This is private data. Do not parse.\n");
 897
 898         r = sd_dhcp_lease_get_address(lease, &address);
 899         if (r >= 0)
 900                 fprintf(f, "ADDRESS=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 901
 902         r = sd_dhcp_lease_get_netmask(lease, &address);
 903         if (r >= 0)
 904                 fprintf(f, "NETMASK=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 905
 906         r = sd_dhcp_lease_get_router(lease, &addresses);
 907         if (r > 0) {
 908                 fputs("ROUTER=", f);
 909                 serialize_in_addrs(f, addresses, r, false, NULL);
 910                 fputc('\n', f);
 911         }
 912
 913         r = sd_dhcp_lease_get_server_identifier(lease, &address);
 914         if (r >= 0)
 915                 fprintf(f, "SERVER_ADDRESS=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 916
 917         r = sd_dhcp_lease_get_next_server(lease, &address);
 918         if (r >= 0)
 919                 fprintf(f, "NEXT_SERVER=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 920
 921         r = sd_dhcp_lease_get_broadcast(lease, &address);
 922         if (r >= 0)
 923                 fprintf(f, "BROADCAST=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 924
 925         r = sd_dhcp_lease_get_mtu(lease, &mtu);
 926         if (r >= 0)
 927                 fprintf(f, "MTU=%" PRIu16 "\n", mtu);
 928
 929         r = sd_dhcp_lease_get_t1(lease, &t1);
 930         if (r >= 0)
 931                 fprintf(f, "T1=%" PRIu32 "\n", t1);
 932
 933         r = sd_dhcp_lease_get_t2(lease, &t2);
 934         if (r >= 0)
 935                 fprintf(f, "T2=%" PRIu32 "\n", t2);
 936
 937         r = sd_dhcp_lease_get_lifetime(lease, &lifetime);
 938         if (r >= 0)
 939                 fprintf(f, "LIFETIME=%" PRIu32 "\n", lifetime);
 940
 941         r = sd_dhcp_lease_get_dns(lease, &addresses);
 942         if (r > 0) {
 943                 fputs("DNS=", f);
 944                 serialize_in_addrs(f, addresses, r, false, NULL);
 945                 fputc('\n', f);
 946         }
 947
 948         r = sd_dhcp_lease_get_ntp(lease, &addresses);
 949         if (r > 0) {
 950                 fputs("NTP=", f);
 951                 serialize_in_addrs(f, addresses, r, false, NULL);
 952                 fputc('\n', f);
 953         }
 954
 955         r = sd_dhcp_lease_get_sip(lease, &addresses);
 956         if (r > 0) {
 957                 fputs("SIP=", f);
 958                 serialize_in_addrs(f, addresses, r, false, NULL);
 959                 fputc('\n', f);
 960         }
 961
 962         r = sd_dhcp_lease_get_domainname(lease, &string);
 963         if (r >= 0)
 964                 fprintf(f, "DOMAINNAME=%s\n", string);
 965
 966         r = sd_dhcp_lease_get_search_domains(lease, &search_domains);
 967         if (r > 0) {
 968                 fputs("DOMAIN_SEARCH_LIST=", f);
 969                 fputstrv(f, search_domains, NULL, NULL);
 970                 fputc('\n', f);
 971         }
 972
 973         r = sd_dhcp_lease_get_hostname(lease, &string);
 974         if (r >= 0)
 975                 fprintf(f, "HOSTNAME=%s\n", string);
 976
 977         r = sd_dhcp_lease_get_root_path(lease, &string);
 978         if (r >= 0)
 979                 fprintf(f, "ROOT_PATH=%s\n", string);
 980
 981         r = sd_dhcp_lease_get_routes(lease, &routes);
 982         if (r > 0)
 983                 serialize_dhcp_routes(f, "ROUTES", routes, r);
 984
 985         r = sd_dhcp_lease_get_timezone(lease, &string);
 986         if (r >= 0)
 987                 fprintf(f, "TIMEZONE=%s\n", string);
 988
 989         r = sd_dhcp_lease_get_client_id(lease, &client_id, &client_id_len);
 990         if (r >= 0) {
 991                 _cleanup_free_ char *client_id_hex = NULL;
 992
 993                 client_id_hex = hexmem(client_id, client_id_len);
 994                 if (!client_id_hex) {
 995                         r = -ENOMEM;
 996                         goto fail;
 997                 }
 998                 fprintf(f, "CLIENTID=%s\n", client_id_hex);
 999         }
1000
1001         r = sd_dhcp_lease_get_vendor_specific(lease, &data, &data_len);
1002         if (r >= 0) {
1003                 _cleanup_free_ char *option_hex = NULL;
1004
1005                 option_hex = hexmem(data, data_len);
1006                 if (!option_hex) {
1007                         r = -ENOMEM;
1008                         goto fail;
1009                 }
1010                 fprintf(f, "VENDOR_SPECIFIC=%s\n", option_hex);
1011         }
1012
1013         LIST_FOREACH(options, option, lease->private_options) {
1014                 char key[STRLEN("OPTION_000")+1];
1015
1016                 xsprintf(key, "OPTION_%" PRIu8, option->tag);
1017                 r = serialize_dhcp_option(f, key, option->data, option->length);
1018                 if (r < 0)
1019                         goto fail;
1020         }
1021
1022         r = fflush_and_check(f);
1023         if (r < 0)
1024                 goto fail;
1025
1026         if (rename(temp_path, lease_file) < 0) {
1027                 r = -errno;
1028                 goto fail;
1029         }
1030
1031         return 0;
1032
1033 fail:
1034         if (temp_path)
1035                 (void) unlink(temp_path);
1036
1037         return log_error_errno(r, "Failed to save lease data %s: %m", lease_file);
1038 }
1039
1040 int dhcp_lease_load(sd_dhcp_lease **ret, const char *lease_file) {
1041
1042         _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL;
1043         _cleanup_free_ char
1044                 *address = NULL,
1045                 *router = NULL,
1046                 *netmask = NULL,
1047                 *server_address = NULL,
1048                 *next_server = NULL,
1049                 *broadcast = NULL,
1050                 *dns = NULL,
1051                 *ntp = NULL,
1052                 *sip = NULL,
1053                 *pop3 = NULL,
1054                 *smtp = NULL,
1055                 *lpr = NULL,
1056                 *mtu = NULL,
1057                 *routes = NULL,
1058                 *domains = NULL,
1059                 *client_id_hex = NULL,
1060                 *vendor_specific_hex = NULL,
1061                 *lifetime = NULL,
1062                 *t1 = NULL,
1063                 *t2 = NULL,
1064                 *options[SD_DHCP_OPTION_PRIVATE_LAST - SD_DHCP_OPTION_PRIVATE_BASE + 1] = {};
1065
1066         int r, i;
1067
1068         assert(lease_file);
1069         assert(ret);
1070
1071         r = dhcp_lease_new(&lease);
1072         if (r < 0)
1073                 return r;
1074
1075         r = parse_env_file(NULL, lease_file,
1076                            "ADDRESS", &address,
1077                            "ROUTER", &router,
1078                            "NETMASK", &netmask,
1079                            "SERVER_ADDRESS", &server_address,
1080                            "NEXT_SERVER", &next_server,
1081                            "BROADCAST", &broadcast,
1082                            "DNS", &dns,
1083                            "NTP", &ntp,
1084                            "SIP", &sip,
1085                            "POP3", &pop3,
1086                            "SMTP", &smtp,
1087                            "LPR", &lpr,
1088                            "MTU", &mtu,
1089                            "DOMAINNAME", &lease->domainname,
1090                            "HOSTNAME", &lease->hostname,
1091                            "DOMAIN_SEARCH_LIST", &domains,
1092                            "ROOT_PATH", &lease->root_path,
1093                            "ROUTES", &routes,
1094                            "CLIENTID", &client_id_hex,
1095                            "TIMEZONE", &lease->timezone,
1096                            "VENDOR_SPECIFIC", &vendor_specific_hex,
1097                            "LIFETIME", &lifetime,
1098                            "T1", &t1,
1099                            "T2", &t2,
1100                            "OPTION_224", &options[0],
1101                            "OPTION_225", &options[1],
1102                            "OPTION_226", &options[2],
1103                            "OPTION_227", &options[3],
1104                            "OPTION_228", &options[4],
1105                            "OPTION_229", &options[5],
1106                            "OPTION_230", &options[6],
1107                            "OPTION_231", &options[7],
1108                            "OPTION_232", &options[8],
1109                            "OPTION_233", &options[9],
1110                            "OPTION_234", &options[10],
1111                            "OPTION_235", &options[11],
1112                            "OPTION_236", &options[12],
1113                            "OPTION_237", &options[13],
1114                            "OPTION_238", &options[14],
1115                            "OPTION_239", &options[15],
1116                            "OPTION_240", &options[16],
1117                            "OPTION_241", &options[17],
1118                            "OPTION_242", &options[18],
1119                            "OPTION_243", &options[19],
1120                            "OPTION_244", &options[20],
1121                            "OPTION_245", &options[21],
1122                            "OPTION_246", &options[22],
1123                            "OPTION_247", &options[23],
1124                            "OPTION_248", &options[24],
1125                            "OPTION_249", &options[25],
1126                            "OPTION_250", &options[26],
1127                            "OPTION_251", &options[27],
1128                            "OPTION_252", &options[28],
1129                            "OPTION_253", &options[29],
1130                            "OPTION_254", &options[30]);
1131         if (r < 0)
1132                 return r;
1133
1134         if (address) {
1135                 r = inet_pton(AF_INET, address, &lease->address);
1136                 if (r <= 0)
1137                         log_debug("Failed to parse address %s, ignoring.", address);
1138         }
1139
1140         if (router) {
1141                 r = deserialize_in_addrs(&lease->router, router);
1142                 if (r < 0)
1143                         log_debug_errno(r, "Failed to deserialize router addresses %s, ignoring: %m", router);
1144                 else
1145                         lease->router_size = r;
1146         }
1147
1148         if (netmask) {
1149                 r = inet_pton(AF_INET, netmask, &lease->subnet_mask);
1150                 if (r <= 0)
1151                         log_debug("Failed to parse netmask %s, ignoring.", netmask);
1152                 else
1153                         lease->have_subnet_mask = true;
1154         }
1155
1156         if (server_address) {
1157                 r = inet_pton(AF_INET, server_address, &lease->server_address);
1158                 if (r <= 0)
1159                         log_debug("Failed to parse server address %s, ignoring.", server_address);
1160         }
1161
1162         if (next_server) {
1163                 r = inet_pton(AF_INET, next_server, &lease->next_server);
1164                 if (r <= 0)
1165                         log_debug("Failed to parse next server %s, ignoring.", next_server);
1166         }
1167
1168         if (broadcast) {
1169                 r = inet_pton(AF_INET, broadcast, &lease->broadcast);
1170                 if (r <= 0)
1171                         log_debug("Failed to parse broadcast address %s, ignoring.", broadcast);
1172                 else
1173                         lease->have_broadcast = true;
1174         }
1175
1176         if (dns) {
1177                 r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_DNS].addr, dns);
1178                 if (r < 0)
1179                         log_debug_errno(r, "Failed to deserialize DNS servers %s, ignoring: %m", dns);
1180                 else
1181                         lease->servers[SD_DHCP_LEASE_DNS].size = r;
1182         }
1183
1184         if (ntp) {
1185                 r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_NTP].addr, ntp);
1186                 if (r < 0)
1187                         log_debug_errno(r, "Failed to deserialize NTP servers %s, ignoring: %m", ntp);
1188                 else
1189                         lease->servers[SD_DHCP_LEASE_NTP].size = r;
1190         }
1191
1192         if (sip) {
1193                 r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_SIP].addr, sip);
1194                 if (r < 0)
1195                         log_debug_errno(r, "Failed to deserialize SIP servers %s, ignoring: %m", sip);
1196                 else
1197                         lease->servers[SD_DHCP_LEASE_SIP].size = r;
1198         }
1199
1200         if (pop3) {
1201                 r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_POP3].addr, pop3);
1202                 if (r < 0)
1203                         log_debug_errno(r, "Failed to deserialize POP3 server %s, ignoring: %m", pop3);
1204                 else
1205                         lease->servers[SD_DHCP_LEASE_POP3].size = r;
1206         }
1207
1208         if (smtp) {
1209                 r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_SMTP].addr, smtp);
1210                 if (r < 0)
1211                         log_debug_errno(r, "Failed to deserialize SMTP server %s, ignoring: %m", smtp);
1212                 else
1213                         lease->servers[SD_DHCP_LEASE_SMTP].size = r;
1214         }
1215
1216         if (lpr) {
1217                 r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_LPR].addr, lpr);
1218                 if (r < 0)
1219                         log_debug_errno(r, "Failed to deserialize LPR server %s, ignoring: %m", lpr);
1220                 else
1221                         lease->servers[SD_DHCP_LEASE_LPR].size = r;
1222         }
1223
1224         if (mtu) {
1225                 r = safe_atou16(mtu, &lease->mtu);
1226                 if (r < 0)
1227                         log_debug_errno(r, "Failed to parse MTU %s, ignoring: %m", mtu);
1228         }
1229
1230         if (domains) {
1231                 _cleanup_strv_free_ char **a = NULL;
1232                 a = strv_split(domains, " ");
1233                 if (!a)
1234                         return -ENOMEM;
1235
1236                 if (!strv_isempty(a))
1237                         lease->search_domains = TAKE_PTR(a);
1238         }
1239
1240         if (routes) {
1241                 r = deserialize_dhcp_routes(
1242                                 &lease->static_route,
1243                                 &lease->static_route_size,
1244                                 &lease->static_route_allocated,
1245                                 routes);
1246                 if (r < 0)
1247                         log_debug_errno(r, "Failed to parse DHCP routes %s, ignoring: %m", routes);
1248         }
1249
1250         if (lifetime) {
1251                 r = safe_atou32(lifetime, &lease->lifetime);
1252                 if (r < 0)
1253                         log_debug_errno(r, "Failed to parse lifetime %s, ignoring: %m", lifetime);
1254         }
1255
1256         if (t1) {
1257                 r = safe_atou32(t1, &lease->t1);
1258                 if (r < 0)
1259                         log_debug_errno(r, "Failed to parse T1 %s, ignoring: %m", t1);
1260         }
1261
1262         if (t2) {
1263                 r = safe_atou32(t2, &lease->t2);
1264                 if (r < 0)
1265                         log_debug_errno(r, "Failed to parse T2 %s, ignoring: %m", t2);
1266         }
1267
1268         if (client_id_hex) {
1269                 r = unhexmem(client_id_hex, (size_t) -1, &lease->client_id, &lease->client_id_len);
1270                 if (r < 0)
1271                         log_debug_errno(r, "Failed to parse client ID %s, ignoring: %m", client_id_hex);
1272         }
1273
1274         if (vendor_specific_hex) {
1275                 r = unhexmem(vendor_specific_hex, (size_t) -1, &lease->vendor_specific, &lease->vendor_specific_len);
1276                 if (r < 0)
1277                         log_debug_errno(r, "Failed to parse vendor specific data %s, ignoring: %m", vendor_specific_hex);
1278         }
1279
1280         for (i = 0; i <= SD_DHCP_OPTION_PRIVATE_LAST - SD_DHCP_OPTION_PRIVATE_BASE; i++) {
1281                 _cleanup_free_ void *data = NULL;
1282                 size_t len;
1283
1284                 if (!options[i])
1285                         continue;
1286
1287                 r = unhexmem(options[i], (size_t) -1, &data, &len);
1288                 if (r < 0) {
1289                         log_debug_errno(r, "Failed to parse private DHCP option %s, ignoring: %m", options[i]);
1290                         continue;
1291                 }
1292
1293                 r = dhcp_lease_insert_private_option(lease, SD_DHCP_OPTION_PRIVATE_BASE + i, data, len);
1294                 if (r < 0)
1295                         return r;
1296         }
1297
1298         *ret = TAKE_PTR(lease);
1299
1300         return 0;
1301 }
1302
1303 int dhcp_lease_set_default_subnet_mask(sd_dhcp_lease *lease) {
1304         struct in_addr address, mask;
1305         int r;
1306
1307         assert(lease);
1308
1309         if (lease->address == 0)
1310                 return -ENODATA;
1311
1312         address.s_addr = lease->address;
1313
1314         /* fall back to the default subnet masks based on address class */
1315         r = in4_addr_default_subnet_mask(&address, &mask);
1316         if (r < 0)
1317                 return r;
1318
1319         lease->subnet_mask = mask.s_addr;
1320         lease->have_subnet_mask = true;
1321
1322         return 0;
1323 }
1324
1325 int sd_dhcp_lease_get_client_id(sd_dhcp_lease *lease, const void **client_id, size_t *client_id_len) {
1326         assert_return(lease, -EINVAL);
1327         assert_return(client_id, -EINVAL);
1328         assert_return(client_id_len, -EINVAL);
1329
1330         if (!lease->client_id)
1331                 return -ENODATA;
1332
1333         *client_id = lease->client_id;
1334         *client_id_len = lease->client_id_len;
1335
1336         return 0;
1337 }
1338
1339 int dhcp_lease_set_client_id(sd_dhcp_lease *lease, const void *client_id, size_t client_id_len) {
1340         assert_return(lease, -EINVAL);
1341         assert_return(client_id || client_id_len <= 0, -EINVAL);
1342
1343         if (client_id_len <= 0)
1344                 lease->client_id = mfree(lease->client_id);
1345         else {
1346                 void *p;
1347
1348                 p = memdup(client_id, client_id_len);
1349                 if (!p)
1350                         return -ENOMEM;
1351
1352                 free(lease->client_id);
1353                 lease->client_id = p;
1354                 lease->client_id_len = client_id_len;
1355         }
1356
1357         return 0;
1358 }
1359
1360 int sd_dhcp_lease_get_timezone(sd_dhcp_lease *lease, const char **tz) {
1361         assert_return(lease, -EINVAL);
1362         assert_return(tz, -EINVAL);
1363
1364         if (!lease->timezone)
1365                 return -ENODATA;
1366
1367         *tz = lease->timezone;
1368         return 0;
1369 }
1370
1371 int sd_dhcp_route_get_destination(sd_dhcp_route *route, struct in_addr *destination) {
1372         assert_return(route, -EINVAL);
1373         assert_return(destination, -EINVAL);
1374
1375         *destination = route->dst_addr;
1376         return 0;
1377 }
1378
1379 int sd_dhcp_route_get_destination_prefix_length(sd_dhcp_route *route, uint8_t *length) {
1380         assert_return(route, -EINVAL);
1381         assert_return(length, -EINVAL);
1382
1383         *length = route->dst_prefixlen;
1384         return 0;
1385 }
1386
1387 int sd_dhcp_route_get_gateway(sd_dhcp_route *route, struct in_addr *gateway) {
1388         assert_return(route, -EINVAL);
1389         assert_return(gateway, -EINVAL);
1390
1391         *gateway = route->gw_addr;
1392         return 0;
1393 }
1394
1395 int sd_dhcp_route_get_option(sd_dhcp_route *route) {
1396         assert_return(route, -EINVAL);
1397
1398         return route->option;
1399 }