2 This file is part of systemd.
4 Copyright (C) 2013 Intel Corporation. All rights reserved.
5 Copyright (C) 2014 Tom Gundersen
7 systemd is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 2.1 of the License, or
10 (at your option) any later version.
12 systemd is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <net/ethernet.h>
26 #include <arpa/inet.h>
27 #include <sys/param.h>
34 #include "dhcp-protocol.h"
35 #include "dhcp-internal.h"
36 #include "dhcp-lease-internal.h"
37 #include "sd-dhcp-lease.h"
38 #include "sd-dhcp-client.h"
39 #include "network-internal.h"
41 int sd_dhcp_lease_get_address(sd_dhcp_lease *lease, struct in_addr *addr) {
42 assert_return(lease, -EINVAL);
43 assert_return(addr, -EINVAL);
45 addr->s_addr = lease->address;
50 int sd_dhcp_lease_get_mtu(sd_dhcp_lease *lease, uint16_t *mtu) {
51 assert_return(lease, -EINVAL);
52 assert_return(mtu, -EINVAL);
62 int sd_dhcp_lease_get_dns(sd_dhcp_lease *lease, struct in_addr **addr, size_t *addr_size) {
63 assert_return(lease, -EINVAL);
64 assert_return(addr, -EINVAL);
65 assert_return(addr_size, -EINVAL);
67 if (lease->dns_size) {
68 *addr_size = lease->dns_size;
76 int sd_dhcp_lease_get_ntp(sd_dhcp_lease *lease, struct in_addr **addr, size_t *addr_size) {
77 assert_return(lease, -EINVAL);
78 assert_return(addr, -EINVAL);
79 assert_return(addr_size, -EINVAL);
81 if (lease->ntp_size) {
82 *addr_size = lease->ntp_size;
90 int sd_dhcp_lease_get_domainname(sd_dhcp_lease *lease, const char **domainname) {
91 assert_return(lease, -EINVAL);
92 assert_return(domainname, -EINVAL);
94 if (lease->domainname)
95 *domainname = lease->domainname;
102 int sd_dhcp_lease_get_hostname(sd_dhcp_lease *lease, const char **hostname) {
103 assert_return(lease, -EINVAL);
104 assert_return(hostname, -EINVAL);
107 *hostname = lease->hostname;
114 int sd_dhcp_lease_get_root_path(sd_dhcp_lease *lease, const char **root_path) {
115 assert_return(lease, -EINVAL);
116 assert_return(root_path, -EINVAL);
118 if (lease->root_path)
119 *root_path = lease->root_path;
126 int sd_dhcp_lease_get_router(sd_dhcp_lease *lease, struct in_addr *addr) {
127 assert_return(lease, -EINVAL);
128 assert_return(addr, -EINVAL);
130 if (lease->router != INADDR_ANY)
131 addr->s_addr = lease->router;
138 int sd_dhcp_lease_get_netmask(sd_dhcp_lease *lease, struct in_addr *addr) {
139 assert_return(lease, -EINVAL);
140 assert_return(addr, -EINVAL);
142 addr->s_addr = lease->subnet_mask;
147 int sd_dhcp_lease_get_server_identifier(sd_dhcp_lease *lease, struct in_addr *addr) {
148 assert_return(lease, -EINVAL);
149 assert_return(addr, -EINVAL);
151 addr->s_addr = lease->server_address;
156 int sd_dhcp_lease_get_next_server(sd_dhcp_lease *lease, struct in_addr *addr) {
157 assert_return(lease, -EINVAL);
158 assert_return(addr, -EINVAL);
160 addr->s_addr = lease->next_server;
165 sd_dhcp_lease *sd_dhcp_lease_ref(sd_dhcp_lease *lease) {
167 assert_se(REFCNT_INC(lease->n_ref) >= 2);
172 sd_dhcp_lease *sd_dhcp_lease_unref(sd_dhcp_lease *lease) {
173 if (lease && REFCNT_DEC(lease->n_ref) <= 0) {
174 free(lease->hostname);
175 free(lease->domainname);
183 int dhcp_lease_parse_options(uint8_t code, uint8_t len, const uint8_t *option,
185 sd_dhcp_lease *lease = user_data;
190 case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
192 memcpy(&val, option, 4);
193 lease->lifetime = be32toh(val);
198 case DHCP_OPTION_SERVER_IDENTIFIER:
200 memcpy(&lease->server_address, option, 4);
204 case DHCP_OPTION_SUBNET_MASK:
206 memcpy(&lease->subnet_mask, option, 4);
210 case DHCP_OPTION_ROUTER:
212 memcpy(&lease->router, option, 4);
216 case DHCP_OPTION_DOMAIN_NAME_SERVER:
217 if (len && !(len % 4)) {
218 lease->dns_size = len / 4;
221 lease->dns = newdup(struct in_addr, option, lease->dns_size);
228 case DHCP_OPTION_NTP_SERVER:
229 if (len && !(len % 4)) {
230 lease->ntp_size = len / 4;
233 lease->ntp = newdup(struct in_addr, option, lease->ntp_size);
240 case DHCP_OPTION_INTERFACE_MTU:
244 memcpy(&mtu, option, 2);
245 lease->mtu = be16toh(mtu);
253 case DHCP_OPTION_DOMAIN_NAME:
255 free(lease->domainname);
256 lease->domainname = strndup((const char *)option, len);
261 case DHCP_OPTION_HOST_NAME:
263 free(lease->hostname);
264 lease->hostname = strndup((const char *)option, len);
269 case DHCP_OPTION_ROOT_PATH:
271 free(lease->root_path);
272 lease->root_path = strndup((const char *)option, len);
277 case DHCP_OPTION_RENEWAL_T1_TIME:
279 memcpy(&val, option, 4);
280 lease->t1 = be32toh(val);
285 case DHCP_OPTION_REBINDING_T2_TIME:
287 memcpy(&val, option, 4);
288 lease->t2 = be32toh(val);
297 int dhcp_lease_new(sd_dhcp_lease **ret) {
298 sd_dhcp_lease *lease;
300 lease = new0(sd_dhcp_lease, 1);
304 lease->router = INADDR_ANY;
305 lease->n_ref = REFCNT_INIT;
311 int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) {
312 _cleanup_free_ char *temp_path = NULL;
313 _cleanup_fclose_ FILE *f = NULL;
314 struct in_addr address;
315 struct in_addr *addresses;
316 size_t addresses_size;
324 r = fopen_temporary(lease_file, &f, &temp_path);
328 fchmod(fileno(f), 0644);
330 r = sd_dhcp_lease_get_address(lease, &address);
335 "# This is private data. Do not parse.\n"
336 "ADDRESS=%s\n", inet_ntoa(address));
338 r = sd_dhcp_lease_get_netmask(lease, &address);
342 fprintf(f, "NETMASK=%s\n", inet_ntoa(address));
344 r = sd_dhcp_lease_get_router(lease, &address);
346 fprintf(f, "ROUTER=%s\n", inet_ntoa(address));
348 r = sd_dhcp_lease_get_server_identifier(lease, &address);
350 fprintf(f, "SERVER_ADDRESS=%s\n",
353 r = sd_dhcp_lease_get_next_server(lease, &address);
355 fprintf(f, "NEXT_SERVER=%s\n", inet_ntoa(address));
357 r = sd_dhcp_lease_get_mtu(lease, &mtu);
359 fprintf(f, "MTU=%" PRIu16 "\n", mtu);
361 r = sd_dhcp_lease_get_dns(lease, &addresses, &addresses_size);
363 serialize_in_addrs(f, "DNS", addresses, addresses_size);
365 r = sd_dhcp_lease_get_ntp(lease, &addresses, &addresses_size);
367 serialize_in_addrs(f, "NTP", addresses, addresses_size);
369 r = sd_dhcp_lease_get_domainname(lease, &string);
371 fprintf(f, "DOMAINNAME=%s\n", string);
373 r = sd_dhcp_lease_get_hostname(lease, &string);
375 fprintf(f, "HOSTNAME=%s\n", string);
377 r = sd_dhcp_lease_get_root_path(lease, &string);
379 fprintf(f, "ROOT_PATH=%s\n", string);
385 if (ferror(f) || rename(temp_path, lease_file) < 0) {
393 log_error("Failed to save lease data %s: %s", lease_file, strerror(-r));
398 int dhcp_lease_load(const char *lease_file, sd_dhcp_lease **ret) {
399 _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
400 _cleanup_free_ char *address = NULL, *router = NULL, *netmask = NULL,
401 *server_address = NULL, *next_server = NULL,
402 *dns = NULL, *ntp = NULL, *mtu = NULL;
409 r = dhcp_lease_new(&lease);
413 r = parse_env_file(lease_file, NEWLINE,
417 "SERVER_IDENTIFIER", &server_address,
418 "NEXT_SERVER", &next_server,
422 "DOMAINNAME", &lease->domainname,
423 "HOSTNAME", &lease->hostname,
424 "ROOT_PATH", &lease->root_path,
430 log_error("Failed to read %s: %s", lease_file, strerror(-r));
434 r = inet_pton(AF_INET, address, &addr);
438 lease->address = addr.s_addr;
441 r = inet_pton(AF_INET, router, &addr);
445 lease->router = addr.s_addr;
448 r = inet_pton(AF_INET, netmask, &addr);
452 lease->subnet_mask = addr.s_addr;
454 if (server_address) {
455 r = inet_pton(AF_INET, server_address, &addr);
459 lease->server_address = addr.s_addr;
463 r = inet_pton(AF_INET, next_server, &addr);
467 lease->next_server = addr.s_addr;
471 r = deserialize_in_addrs(&lease->dns, &lease->dns_size, dns);
477 r = deserialize_in_addrs(&lease->ntp, &lease->ntp_size, dns);
484 if (sscanf(mtu, "%" SCNu16, &u) > 0)
494 int dhcp_lease_set_default_subnet_mask(sd_dhcp_lease *lease) {
498 assert(lease->address != INADDR_ANY);
500 address = be32toh(lease->address);
502 /* fall back to the default subnet masks based on address class */
504 if ((address >> 31) == 0x0)
505 /* class A, leading bits: 0 */
506 lease->subnet_mask = htobe32(0xff000000);
507 else if ((address >> 30) == 0x2)
508 /* class B, leading bits 10 */
509 lease->subnet_mask = htobe32(0xffff0000);
510 else if ((address >> 29) == 0x6)
511 /* class C, leading bits 110 */
512 lease->subnet_mask = htobe32(0xffffff00);
514 /* class D or E, no default mask. give up */