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);
184 int dhcp_lease_parse_options(uint8_t code, uint8_t len, const uint8_t *option,
186 sd_dhcp_lease *lease = user_data;
191 case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
193 memcpy(&val, option, 4);
194 lease->lifetime = be32toh(val);
199 case DHCP_OPTION_SERVER_IDENTIFIER:
201 memcpy(&lease->server_address, option, 4);
205 case DHCP_OPTION_SUBNET_MASK:
207 memcpy(&lease->subnet_mask, option, 4);
211 case DHCP_OPTION_ROUTER:
213 memcpy(&lease->router, option, 4);
217 case DHCP_OPTION_DOMAIN_NAME_SERVER:
218 if (len && !(len % 4)) {
219 lease->dns_size = len / 4;
222 lease->dns = newdup(struct in_addr, option, lease->dns_size);
229 case DHCP_OPTION_NTP_SERVER:
230 if (len && !(len % 4)) {
231 lease->ntp_size = len / 4;
234 lease->ntp = newdup(struct in_addr, option, lease->ntp_size);
241 case DHCP_OPTION_INTERFACE_MTU:
245 memcpy(&mtu, option, 2);
246 lease->mtu = be16toh(mtu);
254 case DHCP_OPTION_DOMAIN_NAME:
256 free(lease->domainname);
257 lease->domainname = strndup((const char *)option, len);
262 case DHCP_OPTION_HOST_NAME:
264 free(lease->hostname);
265 lease->hostname = strndup((const char *)option, len);
270 case DHCP_OPTION_ROOT_PATH:
272 free(lease->root_path);
273 lease->root_path = strndup((const char *)option, len);
278 case DHCP_OPTION_RENEWAL_T1_TIME:
280 memcpy(&val, option, 4);
281 lease->t1 = be32toh(val);
286 case DHCP_OPTION_REBINDING_T2_TIME:
288 memcpy(&val, option, 4);
289 lease->t2 = be32toh(val);
298 int dhcp_lease_new(sd_dhcp_lease **ret) {
299 sd_dhcp_lease *lease;
301 lease = new0(sd_dhcp_lease, 1);
305 lease->router = INADDR_ANY;
306 lease->n_ref = REFCNT_INIT;
312 int dhcp_lease_save(sd_dhcp_lease *lease, const char *lease_file) {
313 _cleanup_free_ char *temp_path = NULL;
314 _cleanup_fclose_ FILE *f = NULL;
315 struct in_addr address;
316 struct in_addr *addresses;
317 size_t addresses_size;
325 r = fopen_temporary(lease_file, &f, &temp_path);
329 fchmod(fileno(f), 0644);
331 r = sd_dhcp_lease_get_address(lease, &address);
336 "# This is private data. Do not parse.\n"
337 "ADDRESS=%s\n", inet_ntoa(address));
339 r = sd_dhcp_lease_get_netmask(lease, &address);
343 fprintf(f, "NETMASK=%s\n", inet_ntoa(address));
345 r = sd_dhcp_lease_get_router(lease, &address);
347 fprintf(f, "ROUTER=%s\n", inet_ntoa(address));
349 r = sd_dhcp_lease_get_server_identifier(lease, &address);
351 fprintf(f, "SERVER_ADDRESS=%s\n",
354 r = sd_dhcp_lease_get_next_server(lease, &address);
356 fprintf(f, "NEXT_SERVER=%s\n", inet_ntoa(address));
358 r = sd_dhcp_lease_get_mtu(lease, &mtu);
360 fprintf(f, "MTU=%" PRIu16 "\n", mtu);
362 r = sd_dhcp_lease_get_dns(lease, &addresses, &addresses_size);
364 serialize_in_addrs(f, "DNS", addresses, addresses_size);
366 r = sd_dhcp_lease_get_ntp(lease, &addresses, &addresses_size);
368 serialize_in_addrs(f, "NTP", addresses, addresses_size);
370 r = sd_dhcp_lease_get_domainname(lease, &string);
372 fprintf(f, "DOMAINNAME=%s\n", string);
374 r = sd_dhcp_lease_get_hostname(lease, &string);
376 fprintf(f, "HOSTNAME=%s\n", string);
378 r = sd_dhcp_lease_get_root_path(lease, &string);
380 fprintf(f, "ROOT_PATH=%s\n", string);
386 if (ferror(f) || rename(temp_path, lease_file) < 0) {
394 log_error("Failed to save lease data %s: %s", lease_file, strerror(-r));
399 int dhcp_lease_load(const char *lease_file, sd_dhcp_lease **ret) {
400 _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
401 _cleanup_free_ char *address = NULL, *router = NULL, *netmask = NULL,
402 *server_address = NULL, *next_server = NULL,
403 *dns = NULL, *ntp = NULL, *mtu = NULL;
410 r = dhcp_lease_new(&lease);
414 r = parse_env_file(lease_file, NEWLINE,
418 "SERVER_IDENTIFIER", &server_address,
419 "NEXT_SERVER", &next_server,
423 "DOMAINNAME", &lease->domainname,
424 "HOSTNAME", &lease->hostname,
425 "ROOT_PATH", &lease->root_path,
431 log_error("Failed to read %s: %s", lease_file, strerror(-r));
435 r = inet_pton(AF_INET, address, &addr);
439 lease->address = addr.s_addr;
442 r = inet_pton(AF_INET, router, &addr);
446 lease->router = addr.s_addr;
449 r = inet_pton(AF_INET, netmask, &addr);
453 lease->subnet_mask = addr.s_addr;
455 if (server_address) {
456 r = inet_pton(AF_INET, server_address, &addr);
460 lease->server_address = addr.s_addr;
464 r = inet_pton(AF_INET, next_server, &addr);
468 lease->next_server = addr.s_addr;
472 r = deserialize_in_addrs(&lease->dns, &lease->dns_size, dns);
478 r = deserialize_in_addrs(&lease->ntp, &lease->ntp_size, dns);
485 if (sscanf(mtu, "%" SCNu16, &u) > 0)
495 int dhcp_lease_set_default_subnet_mask(sd_dhcp_lease *lease) {
499 assert(lease->address != INADDR_ANY);
501 address = be32toh(lease->address);
503 /* fall back to the default subnet masks based on address class */
505 if ((address >> 31) == 0x0)
506 /* class A, leading bits: 0 */
507 lease->subnet_mask = htobe32(0xff000000);
508 else if ((address >> 30) == 0x2)
509 /* class B, leading bits 10 */
510 lease->subnet_mask = htobe32(0xffff0000);
511 else if ((address >> 29) == 0x6)
512 /* class C, leading bits 110 */
513 lease->subnet_mask = htobe32(0xffffff00);
515 /* class D or E, no default mask. give up */