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

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   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 "fs-util.h"
  23 #include "hexdecoct.h"
  24 #include "hostname-util.h"
  25 #include "in-addr-util.h"
  26 #include "network-internal.h"
  27 #include "parse-util.h"
  28 #include "stdio-util.h"
  29 #include "string-util.h"
  30 #include "strv.h"
  31 #include "tmpfile-util.h"
  32 #include "unaligned.h"
  33
  34 int sd_dhcp_lease_get_address(sd_dhcp_lease *lease, struct in_addr *addr) {
  35         assert_return(lease, -EINVAL);
  36         assert_return(addr, -EINVAL);
  37
  38         if (lease->address == 0)
  39                 return -ENODATA;
  40
  41         addr->s_addr = lease->address;
  42         return 0;
  43 }
  44
  45 int sd_dhcp_lease_get_broadcast(sd_dhcp_lease *lease, struct in_addr *addr) {
  46         assert_return(lease, -EINVAL);
  47         assert_return(addr, -EINVAL);
  48
  49         if (!lease->have_broadcast)
  50                 return -ENODATA;
  51
  52         addr->s_addr = lease->broadcast;
  53         return 0;
  54 }
  55
  56 int sd_dhcp_lease_get_lifetime(sd_dhcp_lease *lease, uint32_t *lifetime) {
  57         assert_return(lease, -EINVAL);
  58         assert_return(lifetime, -EINVAL);
  59
  60         if (lease->lifetime <= 0)
  61                 return -ENODATA;
  62
  63         *lifetime = lease->lifetime;
  64         return 0;
  65 }
  66
  67 int sd_dhcp_lease_get_t1(sd_dhcp_lease *lease, uint32_t *t1) {
  68         assert_return(lease, -EINVAL);
  69         assert_return(t1, -EINVAL);
  70
  71         if (lease->t1 <= 0)
  72                 return -ENODATA;
  73
  74         *t1 = lease->t1;
  75         return 0;
  76 }
  77
  78 int sd_dhcp_lease_get_t2(sd_dhcp_lease *lease, uint32_t *t2) {
  79         assert_return(lease, -EINVAL);
  80         assert_return(t2, -EINVAL);
  81
  82         if (lease->t2 <= 0)
  83                 return -ENODATA;
  84
  85         *t2 = lease->t2;
  86         return 0;
  87 }
  88
  89 int sd_dhcp_lease_get_mtu(sd_dhcp_lease *lease, uint16_t *mtu) {
  90         assert_return(lease, -EINVAL);
  91         assert_return(mtu, -EINVAL);
  92
  93         if (lease->mtu <= 0)
  94                 return -ENODATA;
  95
  96         *mtu = lease->mtu;
  97         return 0;
  98 }
  99
 100 int sd_dhcp_lease_get_servers(
 101                 sd_dhcp_lease *lease,
 102                 sd_dhcp_lease_server_type_t what,
 103                 const struct in_addr **addr) {
 104
 105         assert_return(lease, -EINVAL);
 106         assert_return(what >= 0, -EINVAL);
 107         assert_return(what < _SD_DHCP_LEASE_SERVER_TYPE_MAX, -EINVAL);
 108         assert_return(addr, -EINVAL);
 109
 110         if (lease->servers[what].size <= 0)
 111                 return -ENODATA;
 112
 113         *addr = lease->servers[what].addr;
 114         return (int) lease->servers[what].size;
 115 }
 116
 117 int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, const struct in_addr **addr) {
 118         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_DNS, addr);
 119 }
 120 int sd_dhcp_lease_get_ntp(sd_dhcp_lease *lease, const struct in_addr **addr) {
 121         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_NTP, addr);
 122 }
 123 int sd_dhcp_lease_get_sip(sd_dhcp_lease *lease, const struct in_addr **addr) {
 124         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_SIP, addr);
 125 }
 126 int sd_dhcp_lease_get_pop3(sd_dhcp_lease *lease, const struct in_addr **addr) {
 127         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_POP3, addr);
 128 }
 129 int sd_dhcp_lease_get_smtp(sd_dhcp_lease *lease, const struct in_addr **addr) {
 130         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_SMTP, addr);
 131 }
 132 int sd_dhcp_lease_get_lpr(sd_dhcp_lease *lease, const struct in_addr **addr) {
 133         return sd_dhcp_lease_get_servers(lease, SD_DHCP_LEASE_LPR, addr);
 134 }
 135
 136 int sd_dhcp_lease_get_domainname(sd_dhcp_lease *lease, const char **domainname) {
 137         assert_return(lease, -EINVAL);
 138         assert_return(domainname, -EINVAL);
 139
 140         if (!lease->domainname)
 141                 return -ENODATA;
 142
 143         *domainname = lease->domainname;
 144         return 0;
 145 }
 146
 147 int sd_dhcp_lease_get_hostname(sd_dhcp_lease *lease, const char **hostname) {
 148         assert_return(lease, -EINVAL);
 149         assert_return(hostname, -EINVAL);
 150
 151         if (!lease->hostname)
 152                 return -ENODATA;
 153
 154         *hostname = lease->hostname;
 155         return 0;
 156 }
 157
 158 int sd_dhcp_lease_get_root_path(sd_dhcp_lease *lease, const char **root_path) {
 159         assert_return(lease, -EINVAL);
 160         assert_return(root_path, -EINVAL);
 161
 162         if (!lease->root_path)
 163                 return -ENODATA;
 164
 165         *root_path = lease->root_path;
 166         return 0;
 167 }
 168
 169 int sd_dhcp_lease_get_router(sd_dhcp_lease *lease, const struct in_addr **addr) {
 170         assert_return(lease, -EINVAL);
 171         assert_return(addr, -EINVAL);
 172
 173         if (lease->router_size <= 0)
 174                 return -ENODATA;
 175
 176         *addr = lease->router;
 177         return (int) lease->router_size;
 178 }
 179
 180 int sd_dhcp_lease_get_netmask(sd_dhcp_lease *lease, struct in_addr *addr) {
 181         assert_return(lease, -EINVAL);
 182         assert_return(addr, -EINVAL);
 183
 184         if (!lease->have_subnet_mask)
 185                 return -ENODATA;
 186
 187         addr->s_addr = lease->subnet_mask;
 188         return 0;
 189 }
 190
 191 int sd_dhcp_lease_get_server_identifier(sd_dhcp_lease *lease, struct in_addr *addr) {
 192         assert_return(lease, -EINVAL);
 193         assert_return(addr, -EINVAL);
 194
 195         if (lease->server_address == 0)
 196                 return -ENODATA;
 197
 198         addr->s_addr = lease->server_address;
 199         return 0;
 200 }
 201
 202 int sd_dhcp_lease_get_next_server(sd_dhcp_lease *lease, struct in_addr *addr) {
 203         assert_return(lease, -EINVAL);
 204         assert_return(addr, -EINVAL);
 205
 206         if (lease->next_server == 0)
 207                 return -ENODATA;
 208
 209         addr->s_addr = lease->next_server;
 210         return 0;
 211 }
 212
 213 /*
 214  * The returned routes array must be freed by the caller.
 215  * Route objects have the same lifetime of the lease and must not be freed.
 216  */
 217 int sd_dhcp_lease_get_routes(sd_dhcp_lease *lease, sd_dhcp_route ***routes) {
 218         sd_dhcp_route **ret;
 219         unsigned i;
 220
 221         assert_return(lease, -EINVAL);
 222         assert_return(routes, -EINVAL);
 223
 224         if (lease->static_route_size <= 0)
 225                 return -ENODATA;
 226
 227         ret = new(sd_dhcp_route *, lease->static_route_size);
 228         if (!ret)
 229                 return -ENOMEM;
 230
 231         for (i = 0; i < lease->static_route_size; i++)
 232                 ret[i] = &lease->static_route[i];
 233
 234         *routes = ret;
 235         return (int) lease->static_route_size;
 236 }
 237
 238 int sd_dhcp_lease_get_search_domains(sd_dhcp_lease *lease, char ***domains) {
 239         size_t r;
 240
 241         assert_return(lease, -EINVAL);
 242         assert_return(domains, -EINVAL);
 243
 244         r = strv_length(lease->search_domains);
 245         if (r > 0) {
 246                 *domains = lease->search_domains;
 247                 return (int) r;
 248         }
 249
 250         return -ENODATA;
 251 }
 252
 253 int sd_dhcp_lease_get_vendor_specific(sd_dhcp_lease *lease, const void **data, size_t *data_len) {
 254         assert_return(lease, -EINVAL);
 255         assert_return(data, -EINVAL);
 256         assert_return(data_len, -EINVAL);
 257
 258         if (lease->vendor_specific_len <= 0)
 259                 return -ENODATA;
 260
 261         *data = lease->vendor_specific;
 262         *data_len = lease->vendor_specific_len;
 263         return 0;
 264 }
 265
 266 static sd_dhcp_lease *dhcp_lease_free(sd_dhcp_lease *lease) {
 267         assert(lease);
 268
 269         while (lease->private_options) {
 270                 struct sd_dhcp_raw_option *option = lease->private_options;
 271
 272                 LIST_REMOVE(options, lease->private_options, option);
 273
 274                 free(option->data);
 275                 free(option);
 276         }
 277
 278         free(lease->root_path);
 279         free(lease->router);
 280         free(lease->timezone);
 281         free(lease->hostname);
 282         free(lease->domainname);
 283
 284         for (sd_dhcp_lease_server_type_t i = 0; i < _SD_DHCP_LEASE_SERVER_TYPE_MAX; i++)
 285                 free(lease->servers[i].addr);
 286
 287         free(lease->static_route);
 288         free(lease->client_id);
 289         free(lease->vendor_specific);
 290         strv_free(lease->search_domains);
 291         return mfree(lease);
 292 }
 293
 294 DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_lease, sd_dhcp_lease, dhcp_lease_free);
 295
 296 static int lease_parse_u32(const uint8_t *option, size_t len, uint32_t *ret, uint32_t min) {
 297         assert(option);
 298         assert(ret);
 299
 300         if (len != 4)
 301                 return -EINVAL;
 302
 303         *ret = unaligned_read_be32((be32_t*) option);
 304         if (*ret < min)
 305                 *ret = min;
 306
 307         return 0;
 308 }
 309
 310 static int lease_parse_u16(const uint8_t *option, size_t len, uint16_t *ret, uint16_t min) {
 311         assert(option);
 312         assert(ret);
 313
 314         if (len != 2)
 315                 return -EINVAL;
 316
 317         *ret = unaligned_read_be16((be16_t*) option);
 318         if (*ret < min)
 319                 *ret = min;
 320
 321         return 0;
 322 }
 323
 324 static int lease_parse_be32(const uint8_t *option, size_t len, be32_t *ret) {
 325         assert(option);
 326         assert(ret);
 327
 328         if (len != 4)
 329                 return -EINVAL;
 330
 331         memcpy(ret, option, 4);
 332         return 0;
 333 }
 334
 335 static int lease_parse_string(const uint8_t *option, size_t len, char **ret) {
 336         assert(option);
 337         assert(ret);
 338
 339         if (len <= 0)
 340                 *ret = mfree(*ret);
 341         else {
 342                 char *string;
 343
 344                 /*
 345                  * One trailing NUL byte is OK, we don't mind. See:
 346                  * https://github.com/systemd/systemd/issues/1337
 347                  */
 348                 if (memchr(option, 0, len - 1))
 349                         return -EINVAL;
 350
 351                 string = memdup_suffix0((const char *) option, len);
 352                 if (!string)
 353                         return -ENOMEM;
 354
 355                 free_and_replace(*ret, string);
 356         }
 357
 358         return 0;
 359 }
 360
 361 static int lease_parse_domain(const uint8_t *option, size_t len, char **ret) {
 362         _cleanup_free_ char *name = NULL, *normalized = NULL;
 363         int r;
 364
 365         assert(option);
 366         assert(ret);
 367
 368         r = lease_parse_string(option, len, &name);
 369         if (r < 0)
 370                 return r;
 371         if (!name) {
 372                 *ret = mfree(*ret);
 373                 return 0;
 374         }
 375
 376         r = dns_name_normalize(name, 0, &normalized);
 377         if (r < 0)
 378                 return r;
 379
 380         if (is_localhost(normalized))
 381                 return -EINVAL;
 382
 383         if (dns_name_is_root(normalized))
 384                 return -EINVAL;
 385
 386         free_and_replace(*ret, normalized);
 387
 388         return 0;
 389 }
 390
 391 static int lease_parse_in_addrs(const uint8_t *option, size_t len, struct in_addr **ret, size_t *n_ret) {
 392         assert(option || len == 0);
 393         assert(ret);
 394         assert(n_ret);
 395
 396         if (len <= 0) {
 397                 *ret = mfree(*ret);
 398                 *n_ret = 0;
 399         } else {
 400                 size_t n_addresses;
 401                 struct in_addr *addresses;
 402
 403                 if (len % 4 != 0)
 404                         return -EINVAL;
 405
 406                 n_addresses = len / 4;
 407
 408                 addresses = newdup(struct in_addr, option, n_addresses);
 409                 if (!addresses)
 410                         return -ENOMEM;
 411
 412                 free(*ret);
 413                 *ret = addresses;
 414                 *n_ret = n_addresses;
 415         }
 416
 417         return 0;
 418 }
 419
 420 static int lease_parse_sip_server(const uint8_t *option, size_t len, struct in_addr **ret, size_t *n_ret) {
 421         assert(option || len == 0);
 422         assert(ret);
 423         assert(n_ret);
 424
 425         if (len <= 0)
 426                 return -EINVAL;
 427
 428         /* The SIP record is like the other, regular server records, but prefixed with a single "encoding"
 429          * byte that is either 0 or 1. We only support it to be 1 for now. Let's drop it and parse it like
 430          * the other fields */
 431
 432         if (option[0] != 1) { /* We only support IP address encoding for now */
 433                 *ret = mfree(*ret);
 434                 *n_ret = 0;
 435                 return 0;
 436         }
 437
 438         return lease_parse_in_addrs(option + 1, len - 1, ret, n_ret);
 439 }
 440
 441 static int lease_parse_routes(
 442                 const uint8_t *option, size_t len,
 443                 struct sd_dhcp_route **routes, size_t *routes_size, size_t *routes_allocated) {
 444
 445         struct in_addr addr;
 446
 447         assert(option || len <= 0);
 448         assert(routes);
 449         assert(routes_size);
 450         assert(routes_allocated);
 451
 452         if (len <= 0)
 453                 return 0;
 454
 455         if (len % 8 != 0)
 456                 return -EINVAL;
 457
 458         if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + (len / 8)))
 459                 return -ENOMEM;
 460
 461         while (len >= 8) {
 462                 struct sd_dhcp_route *route = *routes + *routes_size;
 463                 int r;
 464
 465                 route->option = SD_DHCP_OPTION_STATIC_ROUTE;
 466                 r = in4_addr_default_prefixlen((struct in_addr*) option, &route->dst_prefixlen);
 467                 if (r < 0) {
 468                         log_debug("Failed to determine destination prefix length from class based IP, ignoring");
 469                         continue;
 470                 }
 471
 472                 assert_se(lease_parse_be32(option, 4, &addr.s_addr) >= 0);
 473                 route->dst_addr = inet_makeaddr(inet_netof(addr), 0);
 474                 option += 4;
 475
 476                 assert_se(lease_parse_be32(option, 4, &route->gw_addr.s_addr) >= 0);
 477                 option += 4;
 478
 479                 len -= 8;
 480                 (*routes_size)++;
 481         }
 482
 483         return 0;
 484 }
 485
 486 /* parses RFC3442 Classless Static Route Option */
 487 static int lease_parse_classless_routes(
 488                 const uint8_t *option, size_t len,
 489                 struct sd_dhcp_route **routes, size_t *routes_size, size_t *routes_allocated) {
 490
 491         assert(option || len <= 0);
 492         assert(routes);
 493         assert(routes_size);
 494         assert(routes_allocated);
 495
 496         if (len <= 0)
 497                 return 0;
 498
 499         /* option format: (subnet-mask-width significant-subnet-octets gateway-ip)*  */
 500
 501         while (len > 0) {
 502                 uint8_t dst_octets;
 503                 struct sd_dhcp_route *route;
 504
 505                 if (!GREEDY_REALLOC(*routes, *routes_allocated, *routes_size + 1))
 506                         return -ENOMEM;
 507
 508                 route = *routes + *routes_size;
 509                 route->option = SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE;
 510
 511                 dst_octets = (*option == 0 ? 0 : ((*option - 1) / 8) + 1);
 512                 route->dst_prefixlen = *option;
 513                 option++;
 514                 len--;
 515
 516                 /* can't have more than 4 octets in IPv4 */
 517                 if (dst_octets > 4 || len < dst_octets)
 518                         return -EINVAL;
 519
 520                 route->dst_addr.s_addr = 0;
 521                 memcpy(&route->dst_addr.s_addr, option, dst_octets);
 522                 option += dst_octets;
 523                 len -= dst_octets;
 524
 525                 if (len < 4)
 526                         return -EINVAL;
 527
 528                 assert_se(lease_parse_be32(option, 4, &route->gw_addr.s_addr) >= 0);
 529                 option += 4;
 530                 len -= 4;
 531
 532                 (*routes_size)++;
 533         }
 534
 535         return 0;
 536 }
 537
 538 int dhcp_lease_parse_options(uint8_t code, uint8_t len, const void *option, void *userdata) {
 539         sd_dhcp_lease *lease = userdata;
 540         int r;
 541
 542         assert(lease);
 543
 544         switch(code) {
 545
 546         case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
 547                 r = lease_parse_u32(option, len, &lease->lifetime, 1);
 548                 if (r < 0)
 549                         log_debug_errno(r, "Failed to parse lease time, ignoring: %m");
 550
 551                 break;
 552
 553         case SD_DHCP_OPTION_SERVER_IDENTIFIER:
 554                 r = lease_parse_be32(option, len, &lease->server_address);
 555                 if (r < 0)
 556                         log_debug_errno(r, "Failed to parse server identifier, ignoring: %m");
 557
 558                 break;
 559
 560         case SD_DHCP_OPTION_SUBNET_MASK:
 561                 r = lease_parse_be32(option, len, &lease->subnet_mask);
 562                 if (r < 0)
 563                         log_debug_errno(r, "Failed to parse subnet mask, ignoring: %m");
 564                 else
 565                         lease->have_subnet_mask = true;
 566                 break;
 567
 568         case SD_DHCP_OPTION_BROADCAST:
 569                 r = lease_parse_be32(option, len, &lease->broadcast);
 570                 if (r < 0)
 571                         log_debug_errno(r, "Failed to parse broadcast address, ignoring: %m");
 572                 else
 573                         lease->have_broadcast = true;
 574                 break;
 575
 576         case SD_DHCP_OPTION_ROUTER:
 577                 r = lease_parse_in_addrs(option, len, &lease->router, &lease->router_size);
 578                 if (r < 0)
 579                         log_debug_errno(r, "Failed to parse router addresses, ignoring: %m");
 580                 break;
 581
 582         case SD_DHCP_OPTION_DOMAIN_NAME_SERVER:
 583                 r = lease_parse_in_addrs(option, len, &lease->servers[SD_DHCP_LEASE_DNS].addr, &lease->servers[SD_DHCP_LEASE_DNS].size);
 584                 if (r < 0)
 585                         log_debug_errno(r, "Failed to parse DNS server, ignoring: %m");
 586                 break;
 587
 588         case SD_DHCP_OPTION_NTP_SERVER:
 589                 r = lease_parse_in_addrs(option, len, &lease->servers[SD_DHCP_LEASE_NTP].addr, &lease->servers[SD_DHCP_LEASE_NTP].size);
 590                 if (r < 0)
 591                         log_debug_errno(r, "Failed to parse NTP server, ignoring: %m");
 592                 break;
 593
 594         case SD_DHCP_OPTION_SIP_SERVER:
 595                 r = lease_parse_sip_server(option, len, &lease->servers[SD_DHCP_LEASE_SIP].addr, &lease->servers[SD_DHCP_LEASE_SIP].size);
 596                 if (r < 0)
 597                         log_debug_errno(r, "Failed to parse SIP server, ignoring: %m");
 598                 break;
 599
 600         case SD_DHCP_OPTION_POP3_SERVER:
 601                 r = lease_parse_in_addrs(option, len, &lease->servers[SD_DHCP_LEASE_POP3].addr, &lease->servers[SD_DHCP_LEASE_POP3].size);
 602                 if (r < 0)
 603                         log_debug_errno(r, "Failed to parse POP3 server, ignoring: %m");
 604                 break;
 605
 606         case SD_DHCP_OPTION_SMTP_SERVER:
 607                 r = lease_parse_in_addrs(option, len, &lease->servers[SD_DHCP_LEASE_SMTP].addr, &lease->servers[SD_DHCP_LEASE_SMTP].size);
 608                 if (r < 0)
 609                         log_debug_errno(r, "Failed to parse SMTP server, ignoring: %m");
 610                 break;
 611
 612         case SD_DHCP_OPTION_LPR_SERVER:
 613                 r = lease_parse_in_addrs(option, len, &lease->servers[SD_DHCP_LEASE_LPR].addr, &lease->servers[SD_DHCP_LEASE_LPR].size);
 614                 if (r < 0)
 615                         log_debug_errno(r, "Failed to parse LPR server, ignoring: %m");
 616                 break;
 617
 618         case SD_DHCP_OPTION_STATIC_ROUTE:
 619                 r = lease_parse_routes(option, len, &lease->static_route, &lease->static_route_size, &lease->static_route_allocated);
 620                 if (r < 0)
 621                         log_debug_errno(r, "Failed to parse static routes, ignoring: %m");
 622                 break;
 623
 624         case SD_DHCP_OPTION_INTERFACE_MTU:
 625                 r = lease_parse_u16(option, len, &lease->mtu, 68);
 626                 if (r < 0)
 627                         log_debug_errno(r, "Failed to parse MTU, ignoring: %m");
 628                 if (lease->mtu < DHCP_DEFAULT_MIN_SIZE) {
 629                         log_debug("MTU value of %" PRIu16 " too small. Using default MTU value of %d instead.", lease->mtu, DHCP_DEFAULT_MIN_SIZE);
 630                         lease->mtu = DHCP_DEFAULT_MIN_SIZE;
 631                 }
 632
 633                 break;
 634
 635         case SD_DHCP_OPTION_DOMAIN_NAME:
 636                 r = lease_parse_domain(option, len, &lease->domainname);
 637                 if (r < 0) {
 638                         log_debug_errno(r, "Failed to parse domain name, ignoring: %m");
 639                         return 0;
 640                 }
 641
 642                 break;
 643
 644         case SD_DHCP_OPTION_DOMAIN_SEARCH_LIST:
 645                 r = dhcp_lease_parse_search_domains(option, len, &lease->search_domains);
 646                 if (r < 0)
 647                         log_debug_errno(r, "Failed to parse Domain Search List, ignoring: %m");
 648                 break;
 649
 650         case SD_DHCP_OPTION_HOST_NAME:
 651                 r = lease_parse_domain(option, len, &lease->hostname);
 652                 if (r < 0) {
 653                         log_debug_errno(r, "Failed to parse hostname, ignoring: %m");
 654                         return 0;
 655                 }
 656
 657                 break;
 658
 659         case SD_DHCP_OPTION_ROOT_PATH:
 660                 r = lease_parse_string(option, len, &lease->root_path);
 661                 if (r < 0)
 662                         log_debug_errno(r, "Failed to parse root path, ignoring: %m");
 663                 break;
 664
 665         case SD_DHCP_OPTION_RENEWAL_T1_TIME:
 666                 r = lease_parse_u32(option, len, &lease->t1, 1);
 667                 if (r < 0)
 668                         log_debug_errno(r, "Failed to parse T1 time, ignoring: %m");
 669                 break;
 670
 671         case SD_DHCP_OPTION_REBINDING_T2_TIME:
 672                 r = lease_parse_u32(option, len, &lease->t2, 1);
 673                 if (r < 0)
 674                         log_debug_errno(r, "Failed to parse T2 time, ignoring: %m");
 675                 break;
 676
 677         case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
 678                 r = lease_parse_classless_routes(
 679                                 option, len,
 680                                 &lease->static_route,
 681                                 &lease->static_route_size,
 682                                 &lease->static_route_allocated);
 683                 if (r < 0)
 684                         log_debug_errno(r, "Failed to parse classless routes, ignoring: %m");
 685                 break;
 686
 687         case SD_DHCP_OPTION_NEW_TZDB_TIMEZONE: {
 688                 _cleanup_free_ char *tz = NULL;
 689
 690                 r = lease_parse_string(option, len, &tz);
 691                 if (r < 0) {
 692                         log_debug_errno(r, "Failed to parse timezone option, ignoring: %m");
 693                         return 0;
 694                 }
 695
 696                 if (!timezone_is_valid(tz, LOG_DEBUG)) {
 697                         log_debug_errno(r, "Timezone is not valid, ignoring: %m");
 698                         return 0;
 699                 }
 700
 701                 free_and_replace(lease->timezone, tz);
 702
 703                 break;
 704         }
 705
 706         case SD_DHCP_OPTION_VENDOR_SPECIFIC:
 707
 708                 if (len <= 0)
 709                         lease->vendor_specific = mfree(lease->vendor_specific);
 710                 else {
 711                         void *p;
 712
 713                         p = memdup(option, len);
 714                         if (!p)
 715                                 return -ENOMEM;
 716
 717                         free(lease->vendor_specific);
 718                         lease->vendor_specific = p;
 719                 }
 720
 721                 lease->vendor_specific_len = len;
 722                 break;
 723
 724         case SD_DHCP_OPTION_PRIVATE_BASE ... SD_DHCP_OPTION_PRIVATE_LAST:
 725                 r = dhcp_lease_insert_private_option(lease, code, option, len);
 726                 if (r < 0)
 727                         return r;
 728
 729                 break;
 730
 731         default:
 732                 log_debug("Ignoring option DHCP option %"PRIu8" while parsing.", code);
 733                 break;
 734         }
 735
 736         return 0;
 737 }
 738
 739 /* Parses compressed domain names. */
 740 int dhcp_lease_parse_search_domains(const uint8_t *option, size_t len, char ***domains) {
 741         _cleanup_strv_free_ char **names = NULL;
 742         size_t pos = 0, cnt = 0;
 743         int r;
 744
 745         assert(domains);
 746         assert_return(option && len > 0, -ENODATA);
 747
 748         while (pos < len) {
 749                 _cleanup_free_ char *name = NULL;
 750                 size_t n = 0, allocated = 0;
 751                 size_t jump_barrier = pos, next_chunk = 0;
 752                 bool first = true;
 753
 754                 for (;;) {
 755                         uint8_t c;
 756                         c = option[pos++];
 757
 758                         if (c == 0) {
 759                                 /* End of name */
 760                                 break;
 761                         } else if (c <= 63) {
 762                                 const char *label;
 763
 764                                 /* Literal label */
 765                                 label = (const char*) (option + pos);
 766                                 pos += c;
 767                                 if (pos >= len)
 768                                         return -EBADMSG;
 769
 770                                 if (!GREEDY_REALLOC(name, allocated, n + !first + DNS_LABEL_ESCAPED_MAX))
 771                                         return -ENOMEM;
 772
 773                                 if (first)
 774                                         first = false;
 775                                 else
 776                                         name[n++] = '.';
 777
 778                                 r = dns_label_escape(label, c, name + n, DNS_LABEL_ESCAPED_MAX);
 779                                 if (r < 0)
 780                                         return r;
 781
 782                                 n += r;
 783                         } else if (FLAGS_SET(c, 0xc0)) {
 784                                 /* Pointer */
 785
 786                                 uint8_t d;
 787                                 uint16_t ptr;
 788
 789                                 if (pos >= len)
 790                                         return -EBADMSG;
 791
 792                                 d = option[pos++];
 793                                 ptr = (uint16_t) (c & ~0xc0) << 8 | (uint16_t) d;
 794
 795                                 /* Jumps are limited to a "prior occurrence" (RFC-1035 4.1.4) */
 796                                 if (ptr >= jump_barrier)
 797                                         return -EBADMSG;
 798                                 jump_barrier = ptr;
 799
 800                                 /* Save current location so we don't end up re-parsing what's parsed so far. */
 801                                 if (next_chunk == 0)
 802                                         next_chunk = pos;
 803
 804                                 pos = ptr;
 805                         } else
 806                                 return -EBADMSG;
 807                 }
 808
 809                 if (!GREEDY_REALLOC(name, allocated, n + 1))
 810                         return -ENOMEM;
 811                 name[n] = 0;
 812
 813                 r = strv_extend(&names, name);
 814                 if (r < 0)
 815                         return r;
 816
 817                 cnt++;
 818
 819                 if (next_chunk != 0)
 820                       pos = next_chunk;
 821         }
 822
 823         *domains = TAKE_PTR(names);
 824
 825         return cnt;
 826 }
 827
 828 int dhcp_lease_insert_private_option(sd_dhcp_lease *lease, uint8_t tag, const void *data, uint8_t len) {
 829         struct sd_dhcp_raw_option *cur, *option;
 830
 831         assert(lease);
 832
 833         LIST_FOREACH(options, cur, lease->private_options) {
 834                 if (tag < cur->tag)
 835                         break;
 836                 if (tag == cur->tag) {
 837                         log_debug("Ignoring duplicate option, tagged %i.", tag);
 838                         return 0;
 839                 }
 840         }
 841
 842         option = new(struct sd_dhcp_raw_option, 1);
 843         if (!option)
 844                 return -ENOMEM;
 845
 846         option->tag = tag;
 847         option->length = len;
 848         option->data = memdup(data, len);
 849         if (!option->data) {
 850                 free(option);
 851                 return -ENOMEM;
 852         }
 853
 854         LIST_INSERT_BEFORE(options, lease->private_options, cur, option);
 855         return 0;
 856 }
 857
 858 int dhcp_lease_new(sd_dhcp_lease **ret) {
 859         sd_dhcp_lease *lease;
 860
 861         lease = new0(sd_dhcp_lease, 1);
 862         if (!lease)
 863                 return -ENOMEM;
 864
 865         lease->n_ref = 1;
 866
 867         *ret = lease;
 868         return 0;
 869 }
 870
 871 int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) {
 872         _cleanup_(unlink_and_freep) char *temp_path = NULL;
 873         _cleanup_fclose_ FILE *f = NULL;
 874         struct sd_dhcp_raw_option *option;
 875         struct in_addr address;
 876         const struct in_addr *addresses;
 877         const void *client_id, *data;
 878         size_t client_id_len, data_len;
 879         char sbuf[INET_ADDRSTRLEN];
 880         const char *string;
 881         uint16_t mtu;
 882         _cleanup_free_ sd_dhcp_route **routes = NULL;
 883         char **search_domains = NULL;
 884         uint32_t t1, t2, lifetime;
 885         int r;
 886
 887         assert(lease);
 888         assert(lease_file);
 889
 890         r = fopen_temporary(lease_file, &f, &temp_path);
 891         if (r < 0)
 892                 return r;
 893
 894         (void) fchmod(fileno(f), 0644);
 895
 896         fprintf(f,
 897                 "# This is private data. Do not parse.\n");
 898
 899         r = sd_dhcp_lease_get_address(lease, &address);
 900         if (r >= 0)
 901                 fprintf(f, "ADDRESS=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 902
 903         r = sd_dhcp_lease_get_netmask(lease, &address);
 904         if (r >= 0)
 905                 fprintf(f, "NETMASK=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 906
 907         r = sd_dhcp_lease_get_router(lease, &addresses);
 908         if (r > 0) {
 909                 fputs("ROUTER=", f);
 910                 serialize_in_addrs(f, addresses, r, false, NULL);
 911                 fputc('\n', f);
 912         }
 913
 914         r = sd_dhcp_lease_get_server_identifier(lease, &address);
 915         if (r >= 0)
 916                 fprintf(f, "SERVER_ADDRESS=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 917
 918         r = sd_dhcp_lease_get_next_server(lease, &address);
 919         if (r >= 0)
 920                 fprintf(f, "NEXT_SERVER=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 921
 922         r = sd_dhcp_lease_get_broadcast(lease, &address);
 923         if (r >= 0)
 924                 fprintf(f, "BROADCAST=%s\n", inet_ntop(AF_INET, &address, sbuf, sizeof(sbuf)));
 925
 926         r = sd_dhcp_lease_get_mtu(lease, &mtu);
 927         if (r >= 0)
 928                 fprintf(f, "MTU=%" PRIu16 "\n", mtu);
 929
 930         r = sd_dhcp_lease_get_t1(lease, &t1);
 931         if (r >= 0)
 932                 fprintf(f, "T1=%" PRIu32 "\n", t1);
 933
 934         r = sd_dhcp_lease_get_t2(lease, &t2);
 935         if (r >= 0)
 936                 fprintf(f, "T2=%" PRIu32 "\n", t2);
 937
 938         r = sd_dhcp_lease_get_lifetime(lease, &lifetime);
 939         if (r >= 0)
 940                 fprintf(f, "LIFETIME=%" PRIu32 "\n", lifetime);
 941
 942         r = sd_dhcp_lease_get_dns(lease, &addresses);
 943         if (r > 0) {
 944                 fputs("DNS=", f);
 945                 serialize_in_addrs(f, addresses, r, false, NULL);
 946                 fputc('\n', f);
 947         }
 948
 949         r = sd_dhcp_lease_get_ntp(lease, &addresses);
 950         if (r > 0) {
 951                 fputs("NTP=", f);
 952                 serialize_in_addrs(f, addresses, r, false, NULL);
 953                 fputc('\n', f);
 954         }
 955
 956         r = sd_dhcp_lease_get_sip(lease, &addresses);
 957         if (r > 0) {
 958                 fputs("SIP=", f);
 959                 serialize_in_addrs(f, addresses, r, false, NULL);
 960                 fputc('\n', f);
 961         }
 962
 963         r = sd_dhcp_lease_get_domainname(lease, &string);
 964         if (r >= 0)
 965                 fprintf(f, "DOMAINNAME=%s\n", string);
 966
 967         r = sd_dhcp_lease_get_search_domains(lease, &search_domains);
 968         if (r > 0) {
 969                 fputs("DOMAIN_SEARCH_LIST=", f);
 970                 fputstrv(f, search_domains, NULL, NULL);
 971                 fputc('\n', f);
 972         }
 973
 974         r = sd_dhcp_lease_get_hostname(lease, &string);
 975         if (r >= 0)
 976                 fprintf(f, "HOSTNAME=%s\n", string);
 977
 978         r = sd_dhcp_lease_get_root_path(lease, &string);
 979         if (r >= 0)
 980                 fprintf(f, "ROOT_PATH=%s\n", string);
 981
 982         r = sd_dhcp_lease_get_routes(lease, &routes);
 983         if (r > 0)
 984                 serialize_dhcp_routes(f, "ROUTES", routes, r);
 985
 986         r = sd_dhcp_lease_get_timezone(lease, &string);
 987         if (r >= 0)
 988                 fprintf(f, "TIMEZONE=%s\n", string);
 989
 990         r = sd_dhcp_lease_get_client_id(lease, &client_id, &client_id_len);
 991         if (r >= 0) {
 992                 _cleanup_free_ char *client_id_hex = NULL;
 993
 994                 client_id_hex = hexmem(client_id, client_id_len);
 995                 if (!client_id_hex)
 996                         return -ENOMEM;
 997                 fprintf(f, "CLIENTID=%s\n", client_id_hex);
 998         }
 999
1000         r = sd_dhcp_lease_get_vendor_specific(lease, &data, &data_len);
1001         if (r >= 0) {
1002                 _cleanup_free_ char *option_hex = NULL;
1003
1004                 option_hex = hexmem(data, data_len);
1005                 if (!option_hex)
1006                         return -ENOMEM;
1007                 fprintf(f, "VENDOR_SPECIFIC=%s\n", option_hex);
1008         }
1009
1010         LIST_FOREACH(options, option, lease->private_options) {
1011                 char key[STRLEN("OPTION_000")+1];
1012
1013                 xsprintf(key, "OPTION_%" PRIu8, option->tag);
1014                 r = serialize_dhcp_option(f, key, option->data, option->length);
1015                 if (r < 0)
1016                         return r;
1017         }
1018
1019         r = fflush_and_check(f);
1020         if (r < 0)
1021                 return r;
1022
1023         r = conservative_rename(temp_path, lease_file);
1024         if (r < 0)
1025                 return r;
1026
1027         temp_path = mfree(temp_path);
1028
1029         return 0;
1030 }
1031
1032 int dhcp_lease_load(sd_dhcp_lease **ret, const char *lease_file) {
1033         _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL;
1034         _cleanup_free_ char
1035                 *address = NULL,
1036                 *router = NULL,
1037                 *netmask = NULL,
1038                 *server_address = NULL,
1039                 *next_server = NULL,
1040                 *broadcast = NULL,
1041                 *dns = NULL,
1042                 *ntp = NULL,
1043                 *sip = NULL,
1044                 *pop3 = NULL,
1045                 *smtp = NULL,
1046                 *lpr = NULL,
1047                 *mtu = NULL,
1048                 *routes = NULL,
1049                 *domains = NULL,
1050                 *client_id_hex = NULL,
1051                 *vendor_specific_hex = NULL,
1052                 *lifetime = NULL,
1053                 *t1 = NULL,
1054                 *t2 = NULL,
1055                 *options[SD_DHCP_OPTION_PRIVATE_LAST - SD_DHCP_OPTION_PRIVATE_BASE + 1] = {};
1056
1057         int r, i;
1058
1059         assert(lease_file);
1060         assert(ret);
1061
1062         r = dhcp_lease_new(&lease);
1063         if (r < 0)
1064                 return r;
1065
1066         r = parse_env_file(NULL, lease_file,
1067                            "ADDRESS", &address,
1068                            "ROUTER", &router,
1069                            "NETMASK", &netmask,
1070                            "SERVER_ADDRESS", &server_address,
1071                            "NEXT_SERVER", &next_server,
1072                            "BROADCAST", &broadcast,
1073                            "DNS", &dns,
1074                            "NTP", &ntp,
1075                            "SIP", &sip,
1076                            "POP3", &pop3,
1077                            "SMTP", &smtp,
1078                            "LPR", &lpr,
1079                            "MTU", &mtu,
1080                            "DOMAINNAME", &lease->domainname,
1081                            "HOSTNAME", &lease->hostname,
1082                            "DOMAIN_SEARCH_LIST", &domains,
1083                            "ROOT_PATH", &lease->root_path,
1084                            "ROUTES", &routes,
1085                            "CLIENTID", &client_id_hex,
1086                            "TIMEZONE", &lease->timezone,
1087                            "VENDOR_SPECIFIC", &vendor_specific_hex,
1088                            "LIFETIME", &lifetime,
1089                            "T1", &t1,
1090                            "T2", &t2,
1091                            "OPTION_224", &options[0],
1092                            "OPTION_225", &options[1],
1093                            "OPTION_226", &options[2],
1094                            "OPTION_227", &options[3],
1095                            "OPTION_228", &options[4],
1096                            "OPTION_229", &options[5],
1097                            "OPTION_230", &options[6],
1098                            "OPTION_231", &options[7],
1099                            "OPTION_232", &options[8],
1100                            "OPTION_233", &options[9],
1101                            "OPTION_234", &options[10],
1102                            "OPTION_235", &options[11],
1103                            "OPTION_236", &options[12],
1104                            "OPTION_237", &options[13],
1105                            "OPTION_238", &options[14],
1106                            "OPTION_239", &options[15],
1107                            "OPTION_240", &options[16],
1108                            "OPTION_241", &options[17],
1109                            "OPTION_242", &options[18],
1110                            "OPTION_243", &options[19],
1111                            "OPTION_244", &options[20],
1112                            "OPTION_245", &options[21],
1113                            "OPTION_246", &options[22],
1114                            "OPTION_247", &options[23],
1115                            "OPTION_248", &options[24],
1116                            "OPTION_249", &options[25],
1117                            "OPTION_250", &options[26],
1118                            "OPTION_251", &options[27],
1119                            "OPTION_252", &options[28],
1120                            "OPTION_253", &options[29],
1121                            "OPTION_254", &options[30]);
1122         if (r < 0)
1123                 return r;
1124
1125         if (address) {
1126                 r = inet_pton(AF_INET, address, &lease->address);
1127                 if (r <= 0)
1128                         log_debug("Failed to parse address %s, ignoring.", address);
1129         }
1130
1131         if (router) {
1132                 r = deserialize_in_addrs(&lease->router, router);
1133                 if (r < 0)
1134                         log_debug_errno(r, "Failed to deserialize router addresses %s, ignoring: %m", router);
1135                 else
1136                         lease->router_size = r;
1137         }
1138
1139         if (netmask) {
1140                 r = inet_pton(AF_INET, netmask, &lease->subnet_mask);
1141                 if (r <= 0)
1142                         log_debug("Failed to parse netmask %s, ignoring.", netmask);
1143                 else
1144                         lease->have_subnet_mask = true;
1145         }
1146
1147         if (server_address) {
1148                 r = inet_pton(AF_INET, server_address, &lease->server_address);
1149                 if (r <= 0)
1150                         log_debug("Failed to parse server address %s, ignoring.", server_address);
1151         }
1152
1153         if (next_server) {
1154                 r = inet_pton(AF_INET, next_server, &lease->next_server);
1155                 if (r <= 0)
1156                         log_debug("Failed to parse next server %s, ignoring.", next_server);
1157         }
1158
1159         if (broadcast) {
1160                 r = inet_pton(AF_INET, broadcast, &lease->broadcast);
1161                 if (r <= 0)
1162                         log_debug("Failed to parse broadcast address %s, ignoring.", broadcast);
1163                 else
1164                         lease->have_broadcast = true;
1165         }
1166
1167         if (dns) {
1168                 r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_DNS].addr, dns);
1169                 if (r < 0)
1170                         log_debug_errno(r, "Failed to deserialize DNS servers %s, ignoring: %m", dns);
1171                 else
1172                         lease->servers[SD_DHCP_LEASE_DNS].size = r;
1173         }
1174
1175         if (ntp) {
1176                 r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_NTP].addr, ntp);
1177                 if (r < 0)
1178                         log_debug_errno(r, "Failed to deserialize NTP servers %s, ignoring: %m", ntp);
1179                 else
1180                         lease->servers[SD_DHCP_LEASE_NTP].size = r;
1181         }
1182
1183         if (sip) {
1184                 r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_SIP].addr, sip);
1185                 if (r < 0)
1186                         log_debug_errno(r, "Failed to deserialize SIP servers %s, ignoring: %m", sip);
1187                 else
1188                         lease->servers[SD_DHCP_LEASE_SIP].size = r;
1189         }
1190
1191         if (pop3) {
1192                 r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_POP3].addr, pop3);
1193                 if (r < 0)
1194                         log_debug_errno(r, "Failed to deserialize POP3 server %s, ignoring: %m", pop3);
1195                 else
1196                         lease->servers[SD_DHCP_LEASE_POP3].size = r;
1197         }
1198
1199         if (smtp) {
1200                 r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_SMTP].addr, smtp);
1201                 if (r < 0)
1202                         log_debug_errno(r, "Failed to deserialize SMTP server %s, ignoring: %m", smtp);
1203                 else
1204                         lease->servers[SD_DHCP_LEASE_SMTP].size = r;
1205         }
1206
1207         if (lpr) {
1208                 r = deserialize_in_addrs(&lease->servers[SD_DHCP_LEASE_LPR].addr, lpr);
1209                 if (r < 0)
1210                         log_debug_errno(r, "Failed to deserialize LPR server %s, ignoring: %m", lpr);
1211                 else
1212                         lease->servers[SD_DHCP_LEASE_LPR].size = r;
1213         }
1214
1215         if (mtu) {
1216                 r = safe_atou16(mtu, &lease->mtu);
1217                 if (r < 0)
1218                         log_debug_errno(r, "Failed to parse MTU %s, ignoring: %m", mtu);
1219         }
1220
1221         if (domains) {
1222                 _cleanup_strv_free_ char **a = NULL;
1223                 a = strv_split(domains, " ");
1224                 if (!a)
1225                         return -ENOMEM;
1226
1227                 if (!strv_isempty(a))
1228                         lease->search_domains = TAKE_PTR(a);
1229         }
1230
1231         if (routes) {
1232                 r = deserialize_dhcp_routes(
1233                                 &lease->static_route,
1234                                 &lease->static_route_size,
1235                                 &lease->static_route_allocated,
1236                                 routes);
1237                 if (r < 0)
1238                         log_debug_errno(r, "Failed to parse DHCP routes %s, ignoring: %m", routes);
1239         }
1240
1241         if (lifetime) {
1242                 r = safe_atou32(lifetime, &lease->lifetime);
1243                 if (r < 0)
1244                         log_debug_errno(r, "Failed to parse lifetime %s, ignoring: %m", lifetime);
1245         }
1246
1247         if (t1) {
1248                 r = safe_atou32(t1, &lease->t1);
1249                 if (r < 0)
1250                         log_debug_errno(r, "Failed to parse T1 %s, ignoring: %m", t1);
1251         }
1252
1253         if (t2) {
1254                 r = safe_atou32(t2, &lease->t2);
1255                 if (r < 0)
1256                         log_debug_errno(r, "Failed to parse T2 %s, ignoring: %m", t2);
1257         }
1258
1259         if (client_id_hex) {
1260                 r = unhexmem(client_id_hex, SIZE_MAX, &lease->client_id, &lease->client_id_len);
1261                 if (r < 0)
1262                         log_debug_errno(r, "Failed to parse client ID %s, ignoring: %m", client_id_hex);
1263         }
1264
1265         if (vendor_specific_hex) {
1266                 r = unhexmem(vendor_specific_hex, SIZE_MAX, &lease->vendor_specific, &lease->vendor_specific_len);
1267                 if (r < 0)
1268                         log_debug_errno(r, "Failed to parse vendor specific data %s, ignoring: %m", vendor_specific_hex);
1269         }
1270
1271         for (i = 0; i <= SD_DHCP_OPTION_PRIVATE_LAST - SD_DHCP_OPTION_PRIVATE_BASE; i++) {
1272                 _cleanup_free_ void *data = NULL;
1273                 size_t len;
1274
1275                 if (!options[i])
1276                         continue;
1277
1278                 r = unhexmem(options[i], SIZE_MAX, &data, &len);
1279                 if (r < 0) {
1280                         log_debug_errno(r, "Failed to parse private DHCP option %s, ignoring: %m", options[i]);
1281                         continue;
1282                 }
1283
1284                 r = dhcp_lease_insert_private_option(lease, SD_DHCP_OPTION_PRIVATE_BASE + i, data, len);
1285                 if (r < 0)
1286                         return r;
1287         }
1288
1289         *ret = TAKE_PTR(lease);
1290
1291         return 0;
1292 }
1293
1294 int dhcp_lease_set_default_subnet_mask(sd_dhcp_lease *lease) {
1295         struct in_addr address, mask;
1296         int r;
1297
1298         assert(lease);
1299
1300         if (lease->address == 0)
1301                 return -ENODATA;
1302
1303         address.s_addr = lease->address;
1304
1305         /* fall back to the default subnet masks based on address class */
1306         r = in4_addr_default_subnet_mask(&address, &mask);
1307         if (r < 0)
1308                 return r;
1309
1310         lease->subnet_mask = mask.s_addr;
1311         lease->have_subnet_mask = true;
1312
1313         return 0;
1314 }
1315
1316 int sd_dhcp_lease_get_client_id(sd_dhcp_lease *lease, const void **client_id, size_t *client_id_len) {
1317         assert_return(lease, -EINVAL);
1318         assert_return(client_id, -EINVAL);
1319         assert_return(client_id_len, -EINVAL);
1320
1321         if (!lease->client_id)
1322                 return -ENODATA;
1323
1324         *client_id = lease->client_id;
1325         *client_id_len = lease->client_id_len;
1326
1327         return 0;
1328 }
1329
1330 int dhcp_lease_set_client_id(sd_dhcp_lease *lease, const void *client_id, size_t client_id_len) {
1331         assert_return(lease, -EINVAL);
1332         assert_return(client_id || client_id_len <= 0, -EINVAL);
1333
1334         if (client_id_len <= 0)
1335                 lease->client_id = mfree(lease->client_id);
1336         else {
1337                 void *p;
1338
1339                 p = memdup(client_id, client_id_len);
1340                 if (!p)
1341                         return -ENOMEM;
1342
1343                 free(lease->client_id);
1344                 lease->client_id = p;
1345                 lease->client_id_len = client_id_len;
1346         }
1347
1348         return 0;
1349 }
1350
1351 int sd_dhcp_lease_get_timezone(sd_dhcp_lease *lease, const char **tz) {
1352         assert_return(lease, -EINVAL);
1353         assert_return(tz, -EINVAL);
1354
1355         if (!lease->timezone)
1356                 return -ENODATA;
1357
1358         *tz = lease->timezone;
1359         return 0;
1360 }
1361
1362 int sd_dhcp_route_get_destination(sd_dhcp_route *route, struct in_addr *destination) {
1363         assert_return(route, -EINVAL);
1364         assert_return(destination, -EINVAL);
1365
1366         *destination = route->dst_addr;
1367         return 0;
1368 }
1369
1370 int sd_dhcp_route_get_destination_prefix_length(sd_dhcp_route *route, uint8_t *length) {
1371         assert_return(route, -EINVAL);
1372         assert_return(length, -EINVAL);
1373
1374         *length = route->dst_prefixlen;
1375         return 0;
1376 }
1377
1378 int sd_dhcp_route_get_gateway(sd_dhcp_route *route, struct in_addr *gateway) {
1379         assert_return(route, -EINVAL);
1380         assert_return(gateway, -EINVAL);
1381
1382         *gateway = route->gw_addr;
1383         return 0;
1384 }
1385
1386 int sd_dhcp_route_get_option(sd_dhcp_route *route) {
1387         assert_return(route, -EINVAL);
1388
1389         return route->option;
1390 }