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b44cd882 TG |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright (C) 2013 Intel Corporation. All rights reserved. | |
5 | Copyright (C) 2014 Tom Gundersen | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
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/>. | |
19 | ***/ | |
20 | ||
ff734080 TG |
21 | #include <sys/ioctl.h> |
22 | ||
b44cd882 | 23 | #include "sd-dhcp-server.h" |
07630cea | 24 | |
b5efdb8a | 25 | #include "alloc-util.h" |
ff734080 | 26 | #include "dhcp-internal.h" |
07630cea | 27 | #include "dhcp-server-internal.h" |
3ffd4af2 | 28 | #include "fd-util.h" |
07630cea LP |
29 | #include "in-addr-util.h" |
30 | #include "siphash24.h" | |
31 | #include "string-util.h" | |
b44cd882 | 32 | |
586ac6f7 LP |
33 | #define DHCP_DEFAULT_LEASE_TIME_USEC USEC_PER_HOUR |
34 | #define DHCP_MAX_LEASE_TIME_USEC (USEC_PER_HOUR*12) | |
4dc35568 | 35 | |
99634696 TG |
36 | /* configures the server's address and subnet, and optionally the pool's size and offset into the subnet |
37 | * the whole pool must fit into the subnet, and may not contain the first (any) nor last (broadcast) address | |
38 | * moreover, the server's own address may be in the pool, and is in that case reserved in order not to | |
39 | * accidentally hand it out */ | |
40 | int sd_dhcp_server_configure_pool(sd_dhcp_server *server, struct in_addr *address, unsigned char prefixlen, uint32_t offset, uint32_t size) { | |
41 | struct in_addr netmask_addr; | |
42 | be32_t netmask; | |
43 | uint32_t server_off, broadcast_off, size_max; | |
44 | ||
2dead812 TG |
45 | assert_return(server, -EINVAL); |
46 | assert_return(address, -EINVAL); | |
99634696 TG |
47 | assert_return(address->s_addr != INADDR_ANY, -EINVAL); |
48 | assert_return(prefixlen <= 32, -ERANGE); | |
49 | assert_return(server->address == INADDR_ANY, -EBUSY); | |
50 | ||
51 | assert_se(in_addr_prefixlen_to_netmask(&netmask_addr, prefixlen)); | |
52 | netmask = netmask_addr.s_addr; | |
53 | ||
54 | server_off = be32toh(address->s_addr & ~netmask); | |
55 | broadcast_off = be32toh(~netmask); | |
56 | ||
57 | /* the server address cannot be the subnet address */ | |
58 | assert_return(server_off != 0, -ERANGE); | |
59 | ||
60 | /* nor the broadcast address */ | |
61 | assert_return(server_off != broadcast_off, -ERANGE); | |
62 | ||
63 | /* 0 offset means we should set a default, we skip the first (subnet) address | |
64 | and take the next one */ | |
65 | if (offset == 0) | |
66 | offset = 1; | |
67 | ||
68 | size_max = (broadcast_off + 1) /* the number of addresses in the subnet */ | |
69 | - offset /* exclude the addresses before the offset */ | |
70 | - 1; /* exclude the last (broadcast) address */ | |
71 | ||
72 | /* The pool must contain at least one address */ | |
73 | assert_return(size_max >= 1, -ERANGE); | |
74 | ||
75 | if (size != 0) | |
76 | assert_return(size <= size_max, -ERANGE); | |
77 | else | |
78 | size = size_max; | |
87322b3a TG |
79 | |
80 | server->bound_leases = new0(DHCPLease*, size); | |
81 | if (!server->bound_leases) | |
82 | return -ENOMEM; | |
2dead812 | 83 | |
99634696 | 84 | server->pool_offset = offset; |
2dead812 TG |
85 | server->pool_size = size; |
86 | ||
20af7091 | 87 | server->address = address->s_addr; |
99634696 TG |
88 | server->netmask = netmask; |
89 | server->subnet = address->s_addr & netmask; | |
90 | ||
91 | if (server_off >= offset && server_off - offset < size) | |
92 | server->bound_leases[server_off - offset] = &server->invalid_lease; | |
20af7091 TG |
93 | |
94 | return 0; | |
95 | } | |
96 | ||
04c01369 | 97 | int sd_dhcp_server_is_running(sd_dhcp_server *server) { |
75677581 | 98 | assert_return(server, false); |
7c16313f TG |
99 | |
100 | return !!server->receive_message; | |
101 | } | |
102 | ||
b44cd882 | 103 | sd_dhcp_server *sd_dhcp_server_ref(sd_dhcp_server *server) { |
3733eec3 LP |
104 | |
105 | if (!server) | |
106 | return NULL; | |
107 | ||
108 | assert(server->n_ref >= 1); | |
109 | server->n_ref++; | |
b44cd882 TG |
110 | |
111 | return server; | |
112 | } | |
113 | ||
b826ab58 | 114 | void client_id_hash_func(const void *p, struct siphash *state) { |
87322b3a TG |
115 | const DHCPClientId *id = p; |
116 | ||
117 | assert(id); | |
118 | assert(id->length); | |
119 | assert(id->data); | |
120 | ||
1e2527a6 | 121 | siphash24_compress(&id->length, sizeof(id->length), state); |
b826ab58 | 122 | siphash24_compress(id->data, id->length, state); |
87322b3a TG |
123 | } |
124 | ||
125 | int client_id_compare_func(const void *_a, const void *_b) { | |
126 | const DHCPClientId *a, *b; | |
127 | ||
128 | a = _a; | |
129 | b = _b; | |
130 | ||
131 | assert(!a->length || a->data); | |
132 | assert(!b->length || b->data); | |
133 | ||
134 | if (a->length != b->length) | |
135 | return a->length < b->length ? -1 : 1; | |
136 | ||
137 | return memcmp(a->data, b->data, a->length); | |
138 | } | |
139 | ||
d5099efc MS |
140 | static const struct hash_ops client_id_hash_ops = { |
141 | .hash = client_id_hash_func, | |
142 | .compare = client_id_compare_func | |
143 | }; | |
144 | ||
87322b3a TG |
145 | static void dhcp_lease_free(DHCPLease *lease) { |
146 | if (!lease) | |
147 | return; | |
148 | ||
149 | free(lease->client_id.data); | |
150 | free(lease); | |
151 | } | |
152 | ||
b44cd882 | 153 | sd_dhcp_server *sd_dhcp_server_unref(sd_dhcp_server *server) { |
3bdace9b | 154 | DHCPLease *lease; |
87322b3a | 155 | |
3bdace9b LP |
156 | if (!server) |
157 | return NULL; | |
b44cd882 | 158 | |
3733eec3 LP |
159 | assert(server->n_ref >= 1); |
160 | server->n_ref--; | |
161 | ||
162 | if (server->n_ref > 0) | |
3bdace9b | 163 | return NULL; |
ff734080 | 164 | |
3bdace9b | 165 | log_dhcp_server(server, "UNREF"); |
87322b3a | 166 | |
3bdace9b | 167 | sd_dhcp_server_stop(server); |
87322b3a | 168 | |
3bdace9b LP |
169 | sd_event_unref(server->event); |
170 | ||
8eb9058d | 171 | free(server->timezone); |
1a04db0f LP |
172 | free(server->dns); |
173 | free(server->ntp); | |
8eb9058d | 174 | |
3bdace9b LP |
175 | while ((lease = hashmap_steal_first(server->leases_by_client_id))) |
176 | dhcp_lease_free(lease); | |
177 | hashmap_free(server->leases_by_client_id); | |
178 | ||
179 | free(server->bound_leases); | |
180 | free(server); | |
b44cd882 TG |
181 | |
182 | return NULL; | |
183 | } | |
184 | ||
3a864fe4 | 185 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
4afd3348 | 186 | _cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL; |
b44cd882 TG |
187 | |
188 | assert_return(ret, -EINVAL); | |
3a864fe4 | 189 | assert_return(ifindex > 0, -EINVAL); |
b44cd882 TG |
190 | |
191 | server = new0(sd_dhcp_server, 1); | |
192 | if (!server) | |
193 | return -ENOMEM; | |
194 | ||
3733eec3 | 195 | server->n_ref = 1; |
8de4a226 | 196 | server->fd_raw = -1; |
ff734080 | 197 | server->fd = -1; |
20af7091 | 198 | server->address = htobe32(INADDR_ANY); |
59b8f6b6 | 199 | server->netmask = htobe32(INADDR_ANY); |
b3ec603c | 200 | server->ifindex = ifindex; |
d5099efc | 201 | server->leases_by_client_id = hashmap_new(&client_id_hash_ops); |
586ac6f7 LP |
202 | server->default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC); |
203 | server->max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC); | |
b44cd882 TG |
204 | |
205 | *ret = server; | |
206 | server = NULL; | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
a6f1e036 TG |
211 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, |
212 | int priority) { | |
b44cd882 TG |
213 | int r; |
214 | ||
215 | assert_return(server, -EINVAL); | |
216 | assert_return(!server->event, -EBUSY); | |
217 | ||
218 | if (event) | |
219 | server->event = sd_event_ref(event); | |
220 | else { | |
221 | r = sd_event_default(&server->event); | |
222 | if (r < 0) | |
223 | return r; | |
224 | } | |
225 | ||
226 | server->event_priority = priority; | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
232 | assert_return(server, -EINVAL); | |
233 | ||
234 | server->event = sd_event_unref(server->event); | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
240 | assert_return(server, NULL); | |
241 | ||
242 | return server->event; | |
243 | } | |
ff734080 TG |
244 | |
245 | int sd_dhcp_server_stop(sd_dhcp_server *server) { | |
246 | assert_return(server, -EINVAL); | |
247 | ||
248 | server->receive_message = | |
249 | sd_event_source_unref(server->receive_message); | |
250 | ||
8de4a226 | 251 | server->fd_raw = safe_close(server->fd_raw); |
ff734080 TG |
252 | server->fd = safe_close(server->fd); |
253 | ||
254 | log_dhcp_server(server, "STOPPED"); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
a6f1e036 TG |
259 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
260 | DHCPPacket *packet, size_t len) { | |
969b009d TG |
261 | union sockaddr_union link = { |
262 | .ll.sll_family = AF_PACKET, | |
263 | .ll.sll_protocol = htons(ETH_P_IP), | |
b3ec603c | 264 | .ll.sll_ifindex = server->ifindex, |
969b009d TG |
265 | .ll.sll_halen = ETH_ALEN, |
266 | }; | |
969b009d TG |
267 | |
268 | assert(server); | |
b3ec603c | 269 | assert(server->ifindex > 0); |
969b009d TG |
270 | assert(server->address); |
271 | assert(packet); | |
272 | assert(len > sizeof(DHCPPacket)); | |
273 | ||
274 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN); | |
275 | ||
276 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, | |
a6f1e036 TG |
277 | packet->dhcp.yiaddr, |
278 | DHCP_PORT_CLIENT, len); | |
969b009d | 279 | |
b3ec603c | 280 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
969b009d TG |
281 | } |
282 | ||
283 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
284 | DHCPMessage *message, size_t len) { | |
285 | union sockaddr_union dest = { | |
286 | .in.sin_family = AF_INET, | |
287 | .in.sin_port = htobe16(DHCP_PORT_CLIENT), | |
288 | .in.sin_addr.s_addr = destination, | |
289 | }; | |
290 | struct iovec iov = { | |
291 | .iov_base = message, | |
292 | .iov_len = len, | |
293 | }; | |
294 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))] = {}; | |
295 | struct msghdr msg = { | |
296 | .msg_name = &dest, | |
297 | .msg_namelen = sizeof(dest.in), | |
298 | .msg_iov = &iov, | |
299 | .msg_iovlen = 1, | |
300 | .msg_control = cmsgbuf, | |
301 | .msg_controllen = sizeof(cmsgbuf), | |
302 | }; | |
303 | struct cmsghdr *cmsg; | |
304 | struct in_pktinfo *pktinfo; | |
305 | int r; | |
306 | ||
307 | assert(server); | |
308 | assert(server->fd > 0); | |
309 | assert(message); | |
310 | assert(len > sizeof(DHCPMessage)); | |
311 | ||
312 | cmsg = CMSG_FIRSTHDR(&msg); | |
313 | assert(cmsg); | |
314 | ||
315 | cmsg->cmsg_level = IPPROTO_IP; | |
316 | cmsg->cmsg_type = IP_PKTINFO; | |
317 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
318 | ||
319 | /* we attach source interface and address info to the message | |
320 | rather than binding the socket. This will be mostly useful | |
321 | when we gain support for arbitrary number of server addresses | |
322 | */ | |
323 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
324 | assert(pktinfo); | |
325 | ||
b3ec603c | 326 | pktinfo->ipi_ifindex = server->ifindex; |
969b009d TG |
327 | pktinfo->ipi_spec_dst.s_addr = server->address; |
328 | ||
329 | r = sendmsg(server->fd, &msg, 0); | |
330 | if (r < 0) | |
331 | return -errno; | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | static bool requested_broadcast(DHCPRequest *req) { | |
337 | assert(req); | |
338 | ||
339 | return req->message->flags & htobe16(0x8000); | |
340 | } | |
341 | ||
342 | int dhcp_server_send_packet(sd_dhcp_server *server, | |
343 | DHCPRequest *req, DHCPPacket *packet, | |
344 | int type, size_t optoffset) { | |
345 | be32_t destination = INADDR_ANY; | |
346 | int r; | |
347 | ||
348 | assert(server); | |
349 | assert(req); | |
350 | assert(req->max_optlen); | |
351 | assert(optoffset <= req->max_optlen); | |
352 | assert(packet); | |
353 | ||
354 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 355 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
969b009d TG |
356 | 4, &server->address); |
357 | if (r < 0) | |
358 | return r; | |
359 | ||
360 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 361 | SD_DHCP_OPTION_END, 0, NULL); |
969b009d TG |
362 | if (r < 0) |
363 | return r; | |
364 | ||
365 | /* RFC 2131 Section 4.1 | |
366 | ||
367 | If the ’giaddr’ field in a DHCP message from a client is non-zero, | |
368 | the server sends any return messages to the ’DHCP server’ port on the | |
369 | BOOTP relay agent whose address appears in ’giaddr’. If the ’giaddr’ | |
370 | field is zero and the ’ciaddr’ field is nonzero, then the server | |
371 | unicasts DHCPOFFER and DHCPACK messages to the address in ’ciaddr’. | |
372 | If ’giaddr’ is zero and ’ciaddr’ is zero, and the broadcast bit is | |
373 | set, then the server broadcasts DHCPOFFER and DHCPACK messages to | |
374 | 0xffffffff. If the broadcast bit is not set and ’giaddr’ is zero and | |
375 | ’ciaddr’ is zero, then the server unicasts DHCPOFFER and DHCPACK | |
376 | messages to the client’s hardware address and ’yiaddr’ address. In | |
377 | all cases, when ’giaddr’ is zero, the server broadcasts any DHCPNAK | |
378 | messages to 0xffffffff. | |
379 | ||
380 | Section 4.3.2 | |
381 | ||
382 | If ’giaddr’ is set in the DHCPREQUEST message, the client is on a | |
383 | different subnet. The server MUST set the broadcast bit in the | |
384 | DHCPNAK, so that the relay agent will broadcast the DHCPNAK to the | |
385 | client, because the client may not have a correct network address | |
386 | or subnet mask, and the client may not be answering ARP requests. | |
387 | */ | |
388 | if (req->message->giaddr) { | |
389 | destination = req->message->giaddr; | |
390 | if (type == DHCP_NAK) | |
391 | packet->dhcp.flags = htobe16(0x8000); | |
392 | } else if (req->message->ciaddr && type != DHCP_NAK) | |
393 | destination = req->message->ciaddr; | |
394 | ||
d6bd972d | 395 | if (destination != INADDR_ANY) |
969b009d TG |
396 | return dhcp_server_send_udp(server, destination, &packet->dhcp, |
397 | sizeof(DHCPMessage) + optoffset); | |
d6bd972d | 398 | else if (requested_broadcast(req) || type == DHCP_NAK) |
a6f1e036 TG |
399 | return dhcp_server_send_udp(server, INADDR_BROADCAST, |
400 | &packet->dhcp, | |
d6bd972d | 401 | sizeof(DHCPMessage) + optoffset); |
969b009d | 402 | else |
a6f1e036 TG |
403 | /* we cannot send UDP packet to specific MAC address when the |
404 | address is not yet configured, so must fall back to raw | |
405 | packets */ | |
969b009d TG |
406 | return dhcp_server_send_unicast_raw(server, packet, |
407 | sizeof(DHCPPacket) + optoffset); | |
408 | } | |
409 | ||
4dc35568 | 410 | static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret, |
a6f1e036 TG |
411 | uint8_t type, size_t *_optoffset, |
412 | DHCPRequest *req) { | |
4dc35568 | 413 | _cleanup_free_ DHCPPacket *packet = NULL; |
1231c4d2 | 414 | size_t optoffset = 0; |
4dc35568 TG |
415 | int r; |
416 | ||
417 | assert(server); | |
418 | assert(ret); | |
419 | assert(_optoffset); | |
bd57b450 | 420 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)); |
4dc35568 TG |
421 | |
422 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen); | |
423 | if (!packet) | |
424 | return -ENOMEM; | |
425 | ||
a6f1e036 | 426 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
76253e73 DW |
427 | be32toh(req->message->xid), type, ARPHRD_ETHER, |
428 | req->max_optlen, &optoffset); | |
4dc35568 TG |
429 | if (r < 0) |
430 | return r; | |
431 | ||
432 | packet->dhcp.flags = req->message->flags; | |
433 | packet->dhcp.giaddr = req->message->giaddr; | |
434 | memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN); | |
435 | ||
436 | *_optoffset = optoffset; | |
437 | *ret = packet; | |
438 | packet = NULL; | |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
a6f1e036 TG |
443 | static int server_send_offer(sd_dhcp_server *server, DHCPRequest *req, |
444 | be32_t address) { | |
4dc35568 TG |
445 | _cleanup_free_ DHCPPacket *packet = NULL; |
446 | size_t offset; | |
447 | be32_t lease_time; | |
448 | int r; | |
449 | ||
450 | r = server_message_init(server, &packet, DHCP_OFFER, &offset, req); | |
451 | if (r < 0) | |
452 | return r; | |
453 | ||
2dead812 | 454 | packet->dhcp.yiaddr = address; |
4dc35568 | 455 | |
c7d9ffe6 | 456 | lease_time = htobe32(req->lifetime); |
4dc35568 | 457 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 458 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 459 | &lease_time); |
4dc35568 TG |
460 | if (r < 0) |
461 | return r; | |
462 | ||
59b8f6b6 | 463 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 464 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
465 | if (r < 0) |
466 | return r; | |
467 | ||
468 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 469 | SD_DHCP_OPTION_ROUTER, 4, &server->address); |
59b8f6b6 TG |
470 | if (r < 0) |
471 | return r; | |
472 | ||
4dc35568 TG |
473 | r = dhcp_server_send_packet(server, req, packet, DHCP_OFFER, offset); |
474 | if (r < 0) | |
475 | return r; | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
a6f1e036 TG |
480 | static int server_send_ack(sd_dhcp_server *server, DHCPRequest *req, |
481 | be32_t address) { | |
2dead812 TG |
482 | _cleanup_free_ DHCPPacket *packet = NULL; |
483 | size_t offset; | |
484 | be32_t lease_time; | |
485 | int r; | |
486 | ||
487 | r = server_message_init(server, &packet, DHCP_ACK, &offset, req); | |
488 | if (r < 0) | |
489 | return r; | |
490 | ||
491 | packet->dhcp.yiaddr = address; | |
492 | ||
c7d9ffe6 | 493 | lease_time = htobe32(req->lifetime); |
2dead812 | 494 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 495 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 496 | &lease_time); |
2dead812 TG |
497 | if (r < 0) |
498 | return r; | |
499 | ||
59b8f6b6 | 500 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 501 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
502 | if (r < 0) |
503 | return r; | |
504 | ||
505 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 506 | SD_DHCP_OPTION_ROUTER, 4, &server->address); |
59b8f6b6 TG |
507 | if (r < 0) |
508 | return r; | |
509 | ||
1a04db0f LP |
510 | if (server->n_dns > 0) { |
511 | r = dhcp_option_append( | |
512 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 513 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, |
1a04db0f LP |
514 | sizeof(struct in_addr) * server->n_dns, server->dns); |
515 | if (r < 0) | |
516 | return r; | |
517 | } | |
518 | ||
519 | if (server->n_ntp > 0) { | |
520 | r = dhcp_option_append( | |
521 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 522 | SD_DHCP_OPTION_NTP_SERVER, |
1a04db0f LP |
523 | sizeof(struct in_addr) * server->n_ntp, server->ntp); |
524 | if (r < 0) | |
525 | return r; | |
526 | } | |
527 | ||
8eb9058d LP |
528 | if (server->timezone) { |
529 | r = dhcp_option_append( | |
530 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 531 | SD_DHCP_OPTION_NEW_TZDB_TIMEZONE, |
8eb9058d LP |
532 | strlen(server->timezone), server->timezone); |
533 | if (r < 0) | |
534 | return r; | |
535 | } | |
536 | ||
2dead812 TG |
537 | r = dhcp_server_send_packet(server, req, packet, DHCP_ACK, offset); |
538 | if (r < 0) | |
539 | return r; | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
bd57b450 TG |
544 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { |
545 | _cleanup_free_ DHCPPacket *packet = NULL; | |
546 | size_t offset; | |
547 | int r; | |
548 | ||
549 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); | |
550 | if (r < 0) | |
551 | return r; | |
552 | ||
b3ec603c | 553 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
bd57b450 TG |
554 | } |
555 | ||
a6f1e036 TG |
556 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
557 | be32_t gateway, uint8_t chaddr[]) { | |
52750344 TG |
558 | _cleanup_free_ DHCPPacket *packet = NULL; |
559 | size_t optoffset = 0; | |
560 | int r; | |
561 | ||
562 | assert(server); | |
563 | assert(address != INADDR_ANY); | |
564 | assert(chaddr); | |
565 | ||
566 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
567 | if (!packet) | |
568 | return -ENOMEM; | |
569 | ||
570 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
76253e73 DW |
571 | DHCP_FORCERENEW, ARPHRD_ETHER, |
572 | DHCP_MIN_OPTIONS_SIZE, &optoffset); | |
52750344 TG |
573 | if (r < 0) |
574 | return r; | |
575 | ||
576 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
22805d92 | 577 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL); |
52750344 TG |
578 | if (r < 0) |
579 | return r; | |
580 | ||
581 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); | |
582 | ||
583 | r = dhcp_server_send_udp(server, address, &packet->dhcp, | |
584 | sizeof(DHCPMessage) + optoffset); | |
c15fb62a TA |
585 | if (r < 0) |
586 | return r; | |
52750344 TG |
587 | |
588 | return 0; | |
589 | } | |
590 | ||
b3ec603c | 591 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
89ca10c6 | 592 | DHCPRequest *req = userdata; |
816e2e7a TG |
593 | |
594 | assert(req); | |
595 | ||
596 | switch(code) { | |
22805d92 | 597 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
c7d9ffe6 TG |
598 | if (len == 4) |
599 | req->lifetime = be32toh(*(be32_t*)option); | |
600 | ||
601 | break; | |
22805d92 | 602 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
2dead812 TG |
603 | if (len == 4) |
604 | req->requested_ip = *(be32_t*)option; | |
605 | ||
606 | break; | |
22805d92 | 607 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
816e2e7a TG |
608 | if (len == 4) |
609 | req->server_id = *(be32_t*)option; | |
610 | ||
611 | break; | |
22805d92 | 612 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
816e2e7a TG |
613 | if (len >= 2) { |
614 | uint8_t *data; | |
615 | ||
616 | data = memdup(option, len); | |
617 | if (!data) | |
618 | return -ENOMEM; | |
619 | ||
620 | free(req->client_id.data); | |
621 | req->client_id.data = data; | |
622 | req->client_id.length = len; | |
623 | } | |
624 | ||
625 | break; | |
22805d92 | 626 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
816e2e7a TG |
627 | if (len == 2) |
628 | req->max_optlen = be16toh(*(be16_t*)option) - | |
629 | - sizeof(DHCPPacket); | |
630 | ||
631 | break; | |
632 | } | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
637 | static void dhcp_request_free(DHCPRequest *req) { | |
638 | if (!req) | |
639 | return; | |
640 | ||
641 | free(req->client_id.data); | |
642 | free(req); | |
643 | } | |
644 | ||
645 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
646 | #define _cleanup_dhcp_request_free_ _cleanup_(dhcp_request_freep) | |
647 | ||
586ac6f7 | 648 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
816e2e7a TG |
649 | assert(req); |
650 | assert(message); | |
651 | ||
652 | req->message = message; | |
653 | ||
e2acdb6b | 654 | /* set client id based on MAC address if client did not send an explicit |
a6f1e036 | 655 | one */ |
816e2e7a | 656 | if (!req->client_id.data) { |
9a0f246f | 657 | void *data; |
816e2e7a | 658 | |
9a0f246f | 659 | data = malloc0(ETH_ALEN + 1); |
816e2e7a TG |
660 | if (!data) |
661 | return -ENOMEM; | |
662 | ||
9a0f246f LP |
663 | ((uint8_t*) data)[0] = 0x01; |
664 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN); | |
665 | ||
816e2e7a TG |
666 | req->client_id.length = ETH_ALEN + 1; |
667 | req->client_id.data = data; | |
816e2e7a TG |
668 | } |
669 | ||
670 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) | |
671 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
672 | ||
9a0f246f | 673 | if (req->lifetime <= 0) |
586ac6f7 LP |
674 | req->lifetime = MAX(1ULL, server->default_lease_time); |
675 | ||
676 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
677 | req->lifetime = server->max_lease_time; | |
c7d9ffe6 | 678 | |
816e2e7a TG |
679 | return 0; |
680 | } | |
681 | ||
87322b3a TG |
682 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { |
683 | assert(server); | |
684 | ||
685 | if (!server->pool_size) | |
686 | return -EINVAL; | |
687 | ||
99634696 TG |
688 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
689 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
690 | return -ERANGE; | |
87322b3a | 691 | |
99634696 | 692 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
87322b3a TG |
693 | } |
694 | ||
83cedf7a TG |
695 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
696 | ||
be077570 TG |
697 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, |
698 | size_t length) { | |
816e2e7a | 699 | _cleanup_dhcp_request_free_ DHCPRequest *req = NULL; |
f693e9b3 | 700 | _cleanup_free_ char *error_message = NULL; |
87322b3a | 701 | DHCPLease *existing_lease; |
816e2e7a | 702 | int type, r; |
be077570 TG |
703 | |
704 | assert(server); | |
705 | assert(message); | |
706 | ||
707 | if (message->op != BOOTREQUEST || | |
708 | message->htype != ARPHRD_ETHER || | |
709 | message->hlen != ETHER_ADDR_LEN) | |
710 | return 0; | |
711 | ||
816e2e7a TG |
712 | req = new0(DHCPRequest, 1); |
713 | if (!req) | |
714 | return -ENOMEM; | |
715 | ||
f693e9b3 | 716 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
be077570 TG |
717 | if (type < 0) |
718 | return 0; | |
719 | ||
586ac6f7 | 720 | r = ensure_sane_request(server, req, message); |
816e2e7a TG |
721 | if (r < 0) |
722 | /* this only fails on critical errors */ | |
723 | return r; | |
724 | ||
a6f1e036 TG |
725 | existing_lease = hashmap_get(server->leases_by_client_id, |
726 | &req->client_id); | |
87322b3a | 727 | |
4dc35568 | 728 | switch(type) { |
9a0f246f LP |
729 | |
730 | case DHCP_DISCOVER: { | |
87322b3a TG |
731 | be32_t address = INADDR_ANY; |
732 | unsigned i; | |
2dead812 | 733 | |
4dc35568 TG |
734 | log_dhcp_server(server, "DISCOVER (0x%x)", |
735 | be32toh(req->message->xid)); | |
736 | ||
2dead812 TG |
737 | if (!server->pool_size) |
738 | /* no pool allocated */ | |
739 | return 0; | |
740 | ||
87322b3a TG |
741 | /* for now pick a random free address from the pool */ |
742 | if (existing_lease) | |
743 | address = existing_lease->address; | |
744 | else { | |
b826ab58 | 745 | struct siphash state; |
0cb3c286 | 746 | uint64_t hash; |
99634696 | 747 | uint32_t next_offer; |
83cedf7a TG |
748 | |
749 | /* even with no persistence of leases, we try to offer the same client | |
750 | the same IP address. we do this by using the hash of the client id | |
751 | as the offset into the pool of leases when finding the next free one */ | |
752 | ||
0cb3c286 | 753 | siphash24_init(&state, HASH_KEY.bytes); |
b826ab58 | 754 | client_id_hash_func(&req->client_id, &state); |
933f9cae | 755 | hash = htole64(siphash24_finalize(&state)); |
0cb3c286 | 756 | next_offer = hash % server->pool_size; |
83cedf7a | 757 | |
87322b3a | 758 | for (i = 0; i < server->pool_size; i++) { |
83cedf7a | 759 | if (!server->bound_leases[next_offer]) { |
99634696 | 760 | address = server->subnet | htobe32(server->pool_offset + next_offer); |
87322b3a TG |
761 | break; |
762 | } else | |
83cedf7a | 763 | next_offer = (next_offer + 1) % server->pool_size; |
87322b3a TG |
764 | } |
765 | } | |
766 | ||
767 | if (address == INADDR_ANY) | |
768 | /* no free addresses left */ | |
769 | return 0; | |
2dead812 TG |
770 | |
771 | r = server_send_offer(server, req, address); | |
4dc35568 TG |
772 | if (r < 0) { |
773 | /* this only fails on critical errors */ | |
774 | log_dhcp_server(server, "could not send offer: %s", | |
775 | strerror(-r)); | |
776 | return r; | |
777 | } else { | |
778 | log_dhcp_server(server, "OFFER (0x%x)", | |
779 | be32toh(req->message->xid)); | |
780 | return DHCP_OFFER; | |
781 | } | |
be077570 | 782 | |
4dc35568 TG |
783 | break; |
784 | } | |
5b34277c | 785 | case DHCP_DECLINE: |
f693e9b3 | 786 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message)); |
5b34277c TG |
787 | |
788 | /* TODO: make sure we don't offer this address again */ | |
789 | ||
790 | return 1; | |
791 | ||
9a0f246f | 792 | case DHCP_REQUEST: { |
2dead812 | 793 | be32_t address; |
bd57b450 | 794 | bool init_reboot = false; |
87322b3a | 795 | int pool_offset; |
2dead812 TG |
796 | |
797 | /* see RFC 2131, section 4.3.2 */ | |
798 | ||
799 | if (req->server_id) { | |
800 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", | |
801 | be32toh(req->message->xid)); | |
802 | ||
803 | /* SELECTING */ | |
804 | if (req->server_id != server->address) | |
805 | /* client did not pick us */ | |
806 | return 0; | |
807 | ||
808 | if (req->message->ciaddr) | |
809 | /* this MUST be zero */ | |
810 | return 0; | |
811 | ||
812 | if (!req->requested_ip) | |
813 | /* this must be filled in with the yiaddr | |
814 | from the chosen OFFER */ | |
815 | return 0; | |
816 | ||
817 | address = req->requested_ip; | |
818 | } else if (req->requested_ip) { | |
819 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", | |
820 | be32toh(req->message->xid)); | |
821 | ||
822 | /* INIT-REBOOT */ | |
823 | if (req->message->ciaddr) | |
824 | /* this MUST be zero */ | |
825 | return 0; | |
826 | ||
bd57b450 | 827 | /* TODO: check more carefully if IP is correct */ |
2dead812 | 828 | address = req->requested_ip; |
bd57b450 | 829 | init_reboot = true; |
2dead812 TG |
830 | } else { |
831 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
832 | be32toh(req->message->xid)); | |
833 | ||
834 | /* REBINDING / RENEWING */ | |
835 | if (!req->message->ciaddr) | |
836 | /* this MUST be filled in with clients IP address */ | |
837 | return 0; | |
838 | ||
839 | address = req->message->ciaddr; | |
840 | } | |
841 | ||
87322b3a TG |
842 | pool_offset = get_pool_offset(server, address); |
843 | ||
844 | /* verify that the requested address is from the pool, and either | |
845 | owned by the current client or free */ | |
846 | if (pool_offset >= 0 && | |
847 | server->bound_leases[pool_offset] == existing_lease) { | |
848 | DHCPLease *lease; | |
a7f7d1bd | 849 | usec_t time_now = 0; |
87322b3a TG |
850 | |
851 | if (!existing_lease) { | |
852 | lease = new0(DHCPLease, 1); | |
853 | lease->address = req->requested_ip; | |
854 | lease->client_id.data = memdup(req->client_id.data, | |
855 | req->client_id.length); | |
02557f97 TA |
856 | if (!lease->client_id.data) { |
857 | free(lease); | |
87322b3a | 858 | return -ENOMEM; |
02557f97 | 859 | } |
87322b3a | 860 | lease->client_id.length = req->client_id.length; |
a6f1e036 TG |
861 | memcpy(&lease->chaddr, &req->message->chaddr, |
862 | ETH_ALEN); | |
52750344 | 863 | lease->gateway = req->message->giaddr; |
87322b3a TG |
864 | } else |
865 | lease = existing_lease; | |
866 | ||
a6f1e036 TG |
867 | r = sd_event_now(server->event, |
868 | clock_boottime_or_monotonic(), | |
869 | &time_now); | |
bff92d2c SS |
870 | if (r < 0) { |
871 | if (!existing_lease) | |
872 | dhcp_lease_free(lease); | |
38a03f06 | 873 | return r; |
bff92d2c SS |
874 | } |
875 | ||
87322b3a TG |
876 | lease->expiration = req->lifetime * USEC_PER_SEC + time_now; |
877 | ||
2dead812 TG |
878 | r = server_send_ack(server, req, address); |
879 | if (r < 0) { | |
880 | /* this only fails on critical errors */ | |
881 | log_dhcp_server(server, "could not send ack: %s", | |
882 | strerror(-r)); | |
87322b3a TG |
883 | |
884 | if (!existing_lease) | |
885 | dhcp_lease_free(lease); | |
886 | ||
2dead812 TG |
887 | return r; |
888 | } else { | |
889 | log_dhcp_server(server, "ACK (0x%x)", | |
890 | be32toh(req->message->xid)); | |
87322b3a TG |
891 | |
892 | server->bound_leases[pool_offset] = lease; | |
a6f1e036 TG |
893 | hashmap_put(server->leases_by_client_id, |
894 | &lease->client_id, lease); | |
87322b3a | 895 | |
2dead812 TG |
896 | return DHCP_ACK; |
897 | } | |
bd57b450 TG |
898 | } else if (init_reboot) { |
899 | r = server_send_nak(server, req); | |
900 | if (r < 0) { | |
901 | /* this only fails on critical errors */ | |
902 | log_dhcp_server(server, "could not send nak: %s", | |
903 | strerror(-r)); | |
904 | return r; | |
905 | } else { | |
906 | log_dhcp_server(server, "NAK (0x%x)", | |
907 | be32toh(req->message->xid)); | |
908 | return DHCP_NAK; | |
909 | } | |
910 | } | |
2dead812 TG |
911 | |
912 | break; | |
913 | } | |
9a0f246f | 914 | |
500792d8 TG |
915 | case DHCP_RELEASE: { |
916 | int pool_offset; | |
917 | ||
918 | log_dhcp_server(server, "RELEASE (0x%x)", | |
919 | be32toh(req->message->xid)); | |
920 | ||
921 | if (!existing_lease) | |
922 | return 0; | |
923 | ||
924 | if (existing_lease->address != req->message->ciaddr) | |
925 | return 0; | |
926 | ||
927 | pool_offset = get_pool_offset(server, req->message->ciaddr); | |
928 | if (pool_offset < 0) | |
929 | return 0; | |
930 | ||
931 | if (server->bound_leases[pool_offset] == existing_lease) { | |
932 | server->bound_leases[pool_offset] = NULL; | |
933 | hashmap_remove(server->leases_by_client_id, existing_lease); | |
934 | dhcp_lease_free(existing_lease); | |
935 | ||
936 | return 1; | |
937 | } else | |
938 | return 0; | |
939 | } | |
2dead812 | 940 | } |
4dc35568 TG |
941 | |
942 | return 0; | |
be077570 TG |
943 | } |
944 | ||
ff734080 TG |
945 | static int server_receive_message(sd_event_source *s, int fd, |
946 | uint32_t revents, void *userdata) { | |
be077570 | 947 | _cleanup_free_ DHCPMessage *message = NULL; |
3a864fe4 | 948 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))]; |
ff734080 TG |
949 | sd_dhcp_server *server = userdata; |
950 | struct iovec iov = {}; | |
951 | struct msghdr msg = { | |
952 | .msg_iov = &iov, | |
953 | .msg_iovlen = 1, | |
3a864fe4 TG |
954 | .msg_control = cmsgbuf, |
955 | .msg_controllen = sizeof(cmsgbuf), | |
ff734080 | 956 | }; |
3a864fe4 | 957 | struct cmsghdr *cmsg; |
4edc2c9b | 958 | ssize_t buflen, len; |
ff734080 TG |
959 | |
960 | assert(server); | |
961 | ||
4edc2c9b LP |
962 | buflen = next_datagram_size_fd(fd); |
963 | if (buflen < 0) | |
964 | return buflen; | |
ff734080 | 965 | |
0d43d2fc | 966 | message = malloc(buflen); |
ff734080 TG |
967 | if (!message) |
968 | return -ENOMEM; | |
969 | ||
970 | iov.iov_base = message; | |
971 | iov.iov_len = buflen; | |
972 | ||
a38d9945 | 973 | len = recvmsg(fd, &msg, 0); |
0d43d2fc TG |
974 | if (len < 0) { |
975 | if (errno == EAGAIN || errno == EINTR) | |
976 | return 0; | |
977 | ||
978 | return -errno; | |
979 | } else if ((size_t)len < sizeof(DHCPMessage)) | |
be077570 | 980 | return 0; |
ff734080 | 981 | |
2a1288ff | 982 | CMSG_FOREACH(cmsg, &msg) { |
3a864fe4 TG |
983 | if (cmsg->cmsg_level == IPPROTO_IP && |
984 | cmsg->cmsg_type == IP_PKTINFO && | |
985 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) { | |
986 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg); | |
987 | ||
a6f1e036 TG |
988 | /* TODO figure out if this can be done as a filter on |
989 | * the socket, like for IPv6 */ | |
b3ec603c | 990 | if (server->ifindex != info->ipi_ifindex) |
3a864fe4 TG |
991 | return 0; |
992 | ||
993 | break; | |
994 | } | |
995 | } | |
996 | ||
be077570 | 997 | return dhcp_server_handle_message(server, message, (size_t)len); |
ff734080 TG |
998 | } |
999 | ||
1000 | int sd_dhcp_server_start(sd_dhcp_server *server) { | |
1001 | int r; | |
1002 | ||
1003 | assert_return(server, -EINVAL); | |
1004 | assert_return(server->event, -EINVAL); | |
1005 | assert_return(!server->receive_message, -EBUSY); | |
8de4a226 | 1006 | assert_return(server->fd_raw == -1, -EBUSY); |
ff734080 | 1007 | assert_return(server->fd == -1, -EBUSY); |
20af7091 | 1008 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH); |
ff734080 | 1009 | |
8de4a226 TG |
1010 | r = socket(AF_PACKET, SOCK_DGRAM | SOCK_NONBLOCK, 0); |
1011 | if (r < 0) { | |
1012 | r = -errno; | |
1013 | sd_dhcp_server_stop(server); | |
1014 | return r; | |
1015 | } | |
1016 | server->fd_raw = r; | |
1017 | ||
ff734080 TG |
1018 | r = dhcp_network_bind_udp_socket(INADDR_ANY, DHCP_PORT_SERVER); |
1019 | if (r < 0) { | |
1020 | sd_dhcp_server_stop(server); | |
1021 | return r; | |
1022 | } | |
1023 | server->fd = r; | |
1024 | ||
1025 | r = sd_event_add_io(server->event, &server->receive_message, | |
1026 | server->fd, EPOLLIN, | |
1027 | server_receive_message, server); | |
1028 | if (r < 0) { | |
1029 | sd_dhcp_server_stop(server); | |
1030 | return r; | |
1031 | } | |
1032 | ||
1033 | r = sd_event_source_set_priority(server->receive_message, | |
1034 | server->event_priority); | |
1035 | if (r < 0) { | |
1036 | sd_dhcp_server_stop(server); | |
1037 | return r; | |
1038 | } | |
1039 | ||
1040 | log_dhcp_server(server, "STARTED"); | |
1041 | ||
1042 | return 0; | |
1043 | } | |
52750344 TG |
1044 | |
1045 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { | |
1046 | unsigned i; | |
621ac3d2 | 1047 | int r = 0; |
52750344 TG |
1048 | |
1049 | assert_return(server, -EINVAL); | |
1050 | assert(server->bound_leases); | |
1051 | ||
1052 | for (i = 0; i < server->pool_size; i++) { | |
1053 | DHCPLease *lease = server->bound_leases[i]; | |
1054 | ||
99634696 | 1055 | if (!lease || lease == &server->invalid_lease) |
52750344 TG |
1056 | continue; |
1057 | ||
1058 | r = server_send_forcerenew(server, lease->address, | |
1059 | lease->gateway, | |
1060 | lease->chaddr); | |
1061 | if (r < 0) | |
1062 | return r; | |
1063 | else | |
1064 | log_dhcp_server(server, "FORCERENEW"); | |
1065 | } | |
1066 | ||
1067 | return r; | |
1068 | } | |
8eb9058d | 1069 | |
64d6c229 | 1070 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { |
8eb9058d LP |
1071 | int r; |
1072 | ||
1073 | assert_return(server, -EINVAL); | |
64d6c229 | 1074 | assert_return(timezone_is_valid(tz), -EINVAL); |
8eb9058d | 1075 | |
64d6c229 | 1076 | if (streq_ptr(tz, server->timezone)) |
8eb9058d LP |
1077 | return 0; |
1078 | ||
64d6c229 | 1079 | r = free_and_strdup(&server->timezone, tz); |
8eb9058d LP |
1080 | if (r < 0) |
1081 | return r; | |
1082 | ||
1083 | return 1; | |
1084 | } | |
586ac6f7 LP |
1085 | |
1086 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1087 | assert_return(server, -EINVAL); | |
1088 | ||
1089 | if (t == server->max_lease_time) | |
1090 | return 0; | |
1091 | ||
1092 | server->max_lease_time = t; | |
1093 | return 1; | |
1094 | } | |
1095 | ||
1096 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1097 | assert_return(server, -EINVAL); | |
1098 | ||
1099 | if (t == server->default_lease_time) | |
1100 | return 0; | |
1101 | ||
1102 | server->default_lease_time = t; | |
1103 | return 1; | |
1104 | } | |
1a04db0f LP |
1105 | |
1106 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], unsigned n) { | |
1107 | assert_return(server, -EINVAL); | |
1108 | assert_return(dns || n <= 0, -EINVAL); | |
1109 | ||
1110 | if (server->n_dns == n && | |
1111 | memcmp(server->dns, dns, sizeof(struct in_addr) * n) == 0) | |
1112 | return 0; | |
1113 | ||
1114 | if (n <= 0) { | |
1115 | server->dns = mfree(server->dns); | |
1116 | server->n_dns = 0; | |
1117 | } else { | |
1118 | struct in_addr *c; | |
1119 | ||
1120 | c = newdup(struct in_addr, dns, n); | |
1121 | if (!c) | |
1122 | return -ENOMEM; | |
1123 | ||
1124 | free(server->dns); | |
1125 | server->dns = c; | |
1126 | server->n_dns = n; | |
1127 | } | |
1128 | ||
1129 | return 1; | |
1130 | } | |
1131 | ||
1132 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], unsigned n) { | |
1133 | assert_return(server, -EINVAL); | |
1134 | assert_return(ntp || n <= 0, -EINVAL); | |
1135 | ||
1136 | if (server->n_ntp == n && | |
1137 | memcmp(server->ntp, ntp, sizeof(struct in_addr) * n) == 0) | |
1138 | return 0; | |
1139 | ||
1140 | if (n <= 0) { | |
1141 | server->ntp = mfree(server->ntp); | |
1142 | server->n_ntp = 0; | |
1143 | } else { | |
1144 | struct in_addr *c; | |
1145 | ||
1146 | c = newdup(struct in_addr, ntp, n); | |
1147 | if (!c) | |
1148 | return -ENOMEM; | |
1149 | ||
1150 | free(server->ntp); | |
1151 | server->ntp = c; | |
1152 | server->n_ntp = n; | |
1153 | } | |
1154 | ||
1155 | return 1; | |
1156 | } |