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b44cd882 TG |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright (C) 2013 Intel Corporation. All rights reserved. | |
7 | Copyright (C) 2014 Tom Gundersen | |
8 | ||
9 | systemd is free software; you can redistribute it and/or modify it | |
10 | under the terms of the GNU Lesser General Public License as published by | |
11 | the Free Software Foundation; either version 2.1 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | systemd is distributed in the hope that it will be useful, but | |
15 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | Lesser General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU Lesser General Public License | |
20 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
21 | ***/ | |
22 | ||
ff734080 TG |
23 | #include <sys/ioctl.h> |
24 | ||
b44cd882 | 25 | #include "sd-dhcp-server.h" |
07630cea | 26 | |
b5efdb8a | 27 | #include "alloc-util.h" |
ff734080 | 28 | #include "dhcp-internal.h" |
07630cea | 29 | #include "dhcp-server-internal.h" |
3ffd4af2 | 30 | #include "fd-util.h" |
07630cea LP |
31 | #include "in-addr-util.h" |
32 | #include "siphash24.h" | |
33 | #include "string-util.h" | |
b44cd882 | 34 | |
586ac6f7 LP |
35 | #define DHCP_DEFAULT_LEASE_TIME_USEC USEC_PER_HOUR |
36 | #define DHCP_MAX_LEASE_TIME_USEC (USEC_PER_HOUR*12) | |
4dc35568 | 37 | |
99634696 TG |
38 | /* configures the server's address and subnet, and optionally the pool's size and offset into the subnet |
39 | * the whole pool must fit into the subnet, and may not contain the first (any) nor last (broadcast) address | |
40 | * moreover, the server's own address may be in the pool, and is in that case reserved in order not to | |
41 | * accidentally hand it out */ | |
42 | int sd_dhcp_server_configure_pool(sd_dhcp_server *server, struct in_addr *address, unsigned char prefixlen, uint32_t offset, uint32_t size) { | |
43 | struct in_addr netmask_addr; | |
44 | be32_t netmask; | |
45 | uint32_t server_off, broadcast_off, size_max; | |
46 | ||
2dead812 TG |
47 | assert_return(server, -EINVAL); |
48 | assert_return(address, -EINVAL); | |
99634696 TG |
49 | assert_return(address->s_addr != INADDR_ANY, -EINVAL); |
50 | assert_return(prefixlen <= 32, -ERANGE); | |
51 | assert_return(server->address == INADDR_ANY, -EBUSY); | |
52 | ||
53 | assert_se(in_addr_prefixlen_to_netmask(&netmask_addr, prefixlen)); | |
54 | netmask = netmask_addr.s_addr; | |
55 | ||
56 | server_off = be32toh(address->s_addr & ~netmask); | |
57 | broadcast_off = be32toh(~netmask); | |
58 | ||
59 | /* the server address cannot be the subnet address */ | |
60 | assert_return(server_off != 0, -ERANGE); | |
61 | ||
62 | /* nor the broadcast address */ | |
63 | assert_return(server_off != broadcast_off, -ERANGE); | |
64 | ||
65 | /* 0 offset means we should set a default, we skip the first (subnet) address | |
66 | and take the next one */ | |
67 | if (offset == 0) | |
68 | offset = 1; | |
69 | ||
70 | size_max = (broadcast_off + 1) /* the number of addresses in the subnet */ | |
71 | - offset /* exclude the addresses before the offset */ | |
72 | - 1; /* exclude the last (broadcast) address */ | |
73 | ||
74 | /* The pool must contain at least one address */ | |
75 | assert_return(size_max >= 1, -ERANGE); | |
76 | ||
77 | if (size != 0) | |
78 | assert_return(size <= size_max, -ERANGE); | |
79 | else | |
80 | size = size_max; | |
87322b3a TG |
81 | |
82 | server->bound_leases = new0(DHCPLease*, size); | |
83 | if (!server->bound_leases) | |
84 | return -ENOMEM; | |
2dead812 | 85 | |
99634696 | 86 | server->pool_offset = offset; |
2dead812 TG |
87 | server->pool_size = size; |
88 | ||
20af7091 | 89 | server->address = address->s_addr; |
99634696 TG |
90 | server->netmask = netmask; |
91 | server->subnet = address->s_addr & netmask; | |
92 | ||
93 | if (server_off >= offset && server_off - offset < size) | |
94 | server->bound_leases[server_off - offset] = &server->invalid_lease; | |
20af7091 TG |
95 | |
96 | return 0; | |
97 | } | |
98 | ||
04c01369 | 99 | int sd_dhcp_server_is_running(sd_dhcp_server *server) { |
75677581 | 100 | assert_return(server, false); |
7c16313f TG |
101 | |
102 | return !!server->receive_message; | |
103 | } | |
104 | ||
b44cd882 | 105 | sd_dhcp_server *sd_dhcp_server_ref(sd_dhcp_server *server) { |
3733eec3 LP |
106 | |
107 | if (!server) | |
108 | return NULL; | |
109 | ||
110 | assert(server->n_ref >= 1); | |
111 | server->n_ref++; | |
b44cd882 TG |
112 | |
113 | return server; | |
114 | } | |
115 | ||
b826ab58 | 116 | void client_id_hash_func(const void *p, struct siphash *state) { |
87322b3a TG |
117 | const DHCPClientId *id = p; |
118 | ||
119 | assert(id); | |
120 | assert(id->length); | |
121 | assert(id->data); | |
122 | ||
1e2527a6 | 123 | siphash24_compress(&id->length, sizeof(id->length), state); |
b826ab58 | 124 | siphash24_compress(id->data, id->length, state); |
87322b3a TG |
125 | } |
126 | ||
127 | int client_id_compare_func(const void *_a, const void *_b) { | |
128 | const DHCPClientId *a, *b; | |
129 | ||
130 | a = _a; | |
131 | b = _b; | |
132 | ||
133 | assert(!a->length || a->data); | |
134 | assert(!b->length || b->data); | |
135 | ||
136 | if (a->length != b->length) | |
137 | return a->length < b->length ? -1 : 1; | |
138 | ||
139 | return memcmp(a->data, b->data, a->length); | |
140 | } | |
141 | ||
d5099efc MS |
142 | static const struct hash_ops client_id_hash_ops = { |
143 | .hash = client_id_hash_func, | |
144 | .compare = client_id_compare_func | |
145 | }; | |
146 | ||
87322b3a TG |
147 | static void dhcp_lease_free(DHCPLease *lease) { |
148 | if (!lease) | |
149 | return; | |
150 | ||
151 | free(lease->client_id.data); | |
152 | free(lease); | |
153 | } | |
154 | ||
b44cd882 | 155 | sd_dhcp_server *sd_dhcp_server_unref(sd_dhcp_server *server) { |
3bdace9b | 156 | DHCPLease *lease; |
87322b3a | 157 | |
3bdace9b LP |
158 | if (!server) |
159 | return NULL; | |
b44cd882 | 160 | |
3733eec3 LP |
161 | assert(server->n_ref >= 1); |
162 | server->n_ref--; | |
163 | ||
164 | if (server->n_ref > 0) | |
3bdace9b | 165 | return NULL; |
ff734080 | 166 | |
3bdace9b | 167 | log_dhcp_server(server, "UNREF"); |
87322b3a | 168 | |
3bdace9b | 169 | sd_dhcp_server_stop(server); |
87322b3a | 170 | |
3bdace9b LP |
171 | sd_event_unref(server->event); |
172 | ||
8eb9058d | 173 | free(server->timezone); |
1a04db0f LP |
174 | free(server->dns); |
175 | free(server->ntp); | |
8eb9058d | 176 | |
3bdace9b LP |
177 | while ((lease = hashmap_steal_first(server->leases_by_client_id))) |
178 | dhcp_lease_free(lease); | |
179 | hashmap_free(server->leases_by_client_id); | |
180 | ||
181 | free(server->bound_leases); | |
182 | free(server); | |
b44cd882 TG |
183 | |
184 | return NULL; | |
185 | } | |
186 | ||
3a864fe4 | 187 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
b44cd882 TG |
188 | _cleanup_dhcp_server_unref_ sd_dhcp_server *server = NULL; |
189 | ||
190 | assert_return(ret, -EINVAL); | |
3a864fe4 | 191 | assert_return(ifindex > 0, -EINVAL); |
b44cd882 TG |
192 | |
193 | server = new0(sd_dhcp_server, 1); | |
194 | if (!server) | |
195 | return -ENOMEM; | |
196 | ||
3733eec3 | 197 | server->n_ref = 1; |
8de4a226 | 198 | server->fd_raw = -1; |
ff734080 | 199 | server->fd = -1; |
20af7091 | 200 | server->address = htobe32(INADDR_ANY); |
59b8f6b6 | 201 | server->netmask = htobe32(INADDR_ANY); |
b3ec603c | 202 | server->ifindex = ifindex; |
d5099efc | 203 | server->leases_by_client_id = hashmap_new(&client_id_hash_ops); |
586ac6f7 LP |
204 | server->default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC); |
205 | server->max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC); | |
b44cd882 TG |
206 | |
207 | *ret = server; | |
208 | server = NULL; | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
a6f1e036 TG |
213 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, |
214 | int priority) { | |
b44cd882 TG |
215 | int r; |
216 | ||
217 | assert_return(server, -EINVAL); | |
218 | assert_return(!server->event, -EBUSY); | |
219 | ||
220 | if (event) | |
221 | server->event = sd_event_ref(event); | |
222 | else { | |
223 | r = sd_event_default(&server->event); | |
224 | if (r < 0) | |
225 | return r; | |
226 | } | |
227 | ||
228 | server->event_priority = priority; | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
234 | assert_return(server, -EINVAL); | |
235 | ||
236 | server->event = sd_event_unref(server->event); | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
242 | assert_return(server, NULL); | |
243 | ||
244 | return server->event; | |
245 | } | |
ff734080 TG |
246 | |
247 | int sd_dhcp_server_stop(sd_dhcp_server *server) { | |
248 | assert_return(server, -EINVAL); | |
249 | ||
250 | server->receive_message = | |
251 | sd_event_source_unref(server->receive_message); | |
252 | ||
8de4a226 | 253 | server->fd_raw = safe_close(server->fd_raw); |
ff734080 TG |
254 | server->fd = safe_close(server->fd); |
255 | ||
256 | log_dhcp_server(server, "STOPPED"); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
a6f1e036 TG |
261 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
262 | DHCPPacket *packet, size_t len) { | |
969b009d TG |
263 | union sockaddr_union link = { |
264 | .ll.sll_family = AF_PACKET, | |
265 | .ll.sll_protocol = htons(ETH_P_IP), | |
b3ec603c | 266 | .ll.sll_ifindex = server->ifindex, |
969b009d TG |
267 | .ll.sll_halen = ETH_ALEN, |
268 | }; | |
969b009d TG |
269 | |
270 | assert(server); | |
b3ec603c | 271 | assert(server->ifindex > 0); |
969b009d TG |
272 | assert(server->address); |
273 | assert(packet); | |
274 | assert(len > sizeof(DHCPPacket)); | |
275 | ||
276 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN); | |
277 | ||
278 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, | |
a6f1e036 TG |
279 | packet->dhcp.yiaddr, |
280 | DHCP_PORT_CLIENT, len); | |
969b009d | 281 | |
b3ec603c | 282 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
969b009d TG |
283 | } |
284 | ||
285 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
286 | DHCPMessage *message, size_t len) { | |
287 | union sockaddr_union dest = { | |
288 | .in.sin_family = AF_INET, | |
289 | .in.sin_port = htobe16(DHCP_PORT_CLIENT), | |
290 | .in.sin_addr.s_addr = destination, | |
291 | }; | |
292 | struct iovec iov = { | |
293 | .iov_base = message, | |
294 | .iov_len = len, | |
295 | }; | |
296 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))] = {}; | |
297 | struct msghdr msg = { | |
298 | .msg_name = &dest, | |
299 | .msg_namelen = sizeof(dest.in), | |
300 | .msg_iov = &iov, | |
301 | .msg_iovlen = 1, | |
302 | .msg_control = cmsgbuf, | |
303 | .msg_controllen = sizeof(cmsgbuf), | |
304 | }; | |
305 | struct cmsghdr *cmsg; | |
306 | struct in_pktinfo *pktinfo; | |
307 | int r; | |
308 | ||
309 | assert(server); | |
310 | assert(server->fd > 0); | |
311 | assert(message); | |
312 | assert(len > sizeof(DHCPMessage)); | |
313 | ||
314 | cmsg = CMSG_FIRSTHDR(&msg); | |
315 | assert(cmsg); | |
316 | ||
317 | cmsg->cmsg_level = IPPROTO_IP; | |
318 | cmsg->cmsg_type = IP_PKTINFO; | |
319 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
320 | ||
321 | /* we attach source interface and address info to the message | |
322 | rather than binding the socket. This will be mostly useful | |
323 | when we gain support for arbitrary number of server addresses | |
324 | */ | |
325 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
326 | assert(pktinfo); | |
327 | ||
b3ec603c | 328 | pktinfo->ipi_ifindex = server->ifindex; |
969b009d TG |
329 | pktinfo->ipi_spec_dst.s_addr = server->address; |
330 | ||
331 | r = sendmsg(server->fd, &msg, 0); | |
332 | if (r < 0) | |
333 | return -errno; | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
338 | static bool requested_broadcast(DHCPRequest *req) { | |
339 | assert(req); | |
340 | ||
341 | return req->message->flags & htobe16(0x8000); | |
342 | } | |
343 | ||
344 | int dhcp_server_send_packet(sd_dhcp_server *server, | |
345 | DHCPRequest *req, DHCPPacket *packet, | |
346 | int type, size_t optoffset) { | |
347 | be32_t destination = INADDR_ANY; | |
348 | int r; | |
349 | ||
350 | assert(server); | |
351 | assert(req); | |
352 | assert(req->max_optlen); | |
353 | assert(optoffset <= req->max_optlen); | |
354 | assert(packet); | |
355 | ||
356 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
357 | DHCP_OPTION_SERVER_IDENTIFIER, | |
358 | 4, &server->address); | |
359 | if (r < 0) | |
360 | return r; | |
361 | ||
362 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
363 | DHCP_OPTION_END, 0, NULL); | |
364 | if (r < 0) | |
365 | return r; | |
366 | ||
367 | /* RFC 2131 Section 4.1 | |
368 | ||
369 | If the ’giaddr’ field in a DHCP message from a client is non-zero, | |
370 | the server sends any return messages to the ’DHCP server’ port on the | |
371 | BOOTP relay agent whose address appears in ’giaddr’. If the ’giaddr’ | |
372 | field is zero and the ’ciaddr’ field is nonzero, then the server | |
373 | unicasts DHCPOFFER and DHCPACK messages to the address in ’ciaddr’. | |
374 | If ’giaddr’ is zero and ’ciaddr’ is zero, and the broadcast bit is | |
375 | set, then the server broadcasts DHCPOFFER and DHCPACK messages to | |
376 | 0xffffffff. If the broadcast bit is not set and ’giaddr’ is zero and | |
377 | ’ciaddr’ is zero, then the server unicasts DHCPOFFER and DHCPACK | |
378 | messages to the client’s hardware address and ’yiaddr’ address. In | |
379 | all cases, when ’giaddr’ is zero, the server broadcasts any DHCPNAK | |
380 | messages to 0xffffffff. | |
381 | ||
382 | Section 4.3.2 | |
383 | ||
384 | If ’giaddr’ is set in the DHCPREQUEST message, the client is on a | |
385 | different subnet. The server MUST set the broadcast bit in the | |
386 | DHCPNAK, so that the relay agent will broadcast the DHCPNAK to the | |
387 | client, because the client may not have a correct network address | |
388 | or subnet mask, and the client may not be answering ARP requests. | |
389 | */ | |
390 | if (req->message->giaddr) { | |
391 | destination = req->message->giaddr; | |
392 | if (type == DHCP_NAK) | |
393 | packet->dhcp.flags = htobe16(0x8000); | |
394 | } else if (req->message->ciaddr && type != DHCP_NAK) | |
395 | destination = req->message->ciaddr; | |
396 | ||
d6bd972d | 397 | if (destination != INADDR_ANY) |
969b009d TG |
398 | return dhcp_server_send_udp(server, destination, &packet->dhcp, |
399 | sizeof(DHCPMessage) + optoffset); | |
d6bd972d | 400 | else if (requested_broadcast(req) || type == DHCP_NAK) |
a6f1e036 TG |
401 | return dhcp_server_send_udp(server, INADDR_BROADCAST, |
402 | &packet->dhcp, | |
d6bd972d | 403 | sizeof(DHCPMessage) + optoffset); |
969b009d | 404 | else |
a6f1e036 TG |
405 | /* we cannot send UDP packet to specific MAC address when the |
406 | address is not yet configured, so must fall back to raw | |
407 | packets */ | |
969b009d TG |
408 | return dhcp_server_send_unicast_raw(server, packet, |
409 | sizeof(DHCPPacket) + optoffset); | |
410 | } | |
411 | ||
4dc35568 | 412 | static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret, |
a6f1e036 TG |
413 | uint8_t type, size_t *_optoffset, |
414 | DHCPRequest *req) { | |
4dc35568 | 415 | _cleanup_free_ DHCPPacket *packet = NULL; |
1231c4d2 | 416 | size_t optoffset = 0; |
4dc35568 TG |
417 | int r; |
418 | ||
419 | assert(server); | |
420 | assert(ret); | |
421 | assert(_optoffset); | |
bd57b450 | 422 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)); |
4dc35568 TG |
423 | |
424 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen); | |
425 | if (!packet) | |
426 | return -ENOMEM; | |
427 | ||
a6f1e036 | 428 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
76253e73 DW |
429 | be32toh(req->message->xid), type, ARPHRD_ETHER, |
430 | req->max_optlen, &optoffset); | |
4dc35568 TG |
431 | if (r < 0) |
432 | return r; | |
433 | ||
434 | packet->dhcp.flags = req->message->flags; | |
435 | packet->dhcp.giaddr = req->message->giaddr; | |
436 | memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN); | |
437 | ||
438 | *_optoffset = optoffset; | |
439 | *ret = packet; | |
440 | packet = NULL; | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
a6f1e036 TG |
445 | static int server_send_offer(sd_dhcp_server *server, DHCPRequest *req, |
446 | be32_t address) { | |
4dc35568 TG |
447 | _cleanup_free_ DHCPPacket *packet = NULL; |
448 | size_t offset; | |
449 | be32_t lease_time; | |
450 | int r; | |
451 | ||
452 | r = server_message_init(server, &packet, DHCP_OFFER, &offset, req); | |
453 | if (r < 0) | |
454 | return r; | |
455 | ||
2dead812 | 456 | packet->dhcp.yiaddr = address; |
4dc35568 | 457 | |
c7d9ffe6 | 458 | lease_time = htobe32(req->lifetime); |
4dc35568 | 459 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
a6f1e036 TG |
460 | DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
461 | &lease_time); | |
4dc35568 TG |
462 | if (r < 0) |
463 | return r; | |
464 | ||
59b8f6b6 TG |
465 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
466 | DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); | |
467 | if (r < 0) | |
468 | return r; | |
469 | ||
470 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
471 | DHCP_OPTION_ROUTER, 4, &server->address); | |
472 | if (r < 0) | |
473 | return r; | |
474 | ||
4dc35568 TG |
475 | r = dhcp_server_send_packet(server, req, packet, DHCP_OFFER, offset); |
476 | if (r < 0) | |
477 | return r; | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
a6f1e036 TG |
482 | static int server_send_ack(sd_dhcp_server *server, DHCPRequest *req, |
483 | be32_t address) { | |
2dead812 TG |
484 | _cleanup_free_ DHCPPacket *packet = NULL; |
485 | size_t offset; | |
486 | be32_t lease_time; | |
487 | int r; | |
488 | ||
489 | r = server_message_init(server, &packet, DHCP_ACK, &offset, req); | |
490 | if (r < 0) | |
491 | return r; | |
492 | ||
493 | packet->dhcp.yiaddr = address; | |
494 | ||
c7d9ffe6 | 495 | lease_time = htobe32(req->lifetime); |
2dead812 | 496 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
a6f1e036 TG |
497 | DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
498 | &lease_time); | |
2dead812 TG |
499 | if (r < 0) |
500 | return r; | |
501 | ||
59b8f6b6 TG |
502 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
503 | DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); | |
504 | if (r < 0) | |
505 | return r; | |
506 | ||
507 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
508 | DHCP_OPTION_ROUTER, 4, &server->address); | |
509 | if (r < 0) | |
510 | return r; | |
511 | ||
1a04db0f LP |
512 | if (server->n_dns > 0) { |
513 | r = dhcp_option_append( | |
514 | &packet->dhcp, req->max_optlen, &offset, 0, | |
515 | DHCP_OPTION_DOMAIN_NAME_SERVER, | |
516 | sizeof(struct in_addr) * server->n_dns, server->dns); | |
517 | if (r < 0) | |
518 | return r; | |
519 | } | |
520 | ||
521 | if (server->n_ntp > 0) { | |
522 | r = dhcp_option_append( | |
523 | &packet->dhcp, req->max_optlen, &offset, 0, | |
524 | DHCP_OPTION_NTP_SERVER, | |
525 | sizeof(struct in_addr) * server->n_ntp, server->ntp); | |
526 | if (r < 0) | |
527 | return r; | |
528 | } | |
529 | ||
8eb9058d LP |
530 | if (server->timezone) { |
531 | r = dhcp_option_append( | |
532 | &packet->dhcp, req->max_optlen, &offset, 0, | |
533 | DHCP_OPTION_NEW_TZDB_TIMEZONE, | |
534 | strlen(server->timezone), server->timezone); | |
535 | if (r < 0) | |
536 | return r; | |
537 | } | |
538 | ||
2dead812 TG |
539 | r = dhcp_server_send_packet(server, req, packet, DHCP_ACK, offset); |
540 | if (r < 0) | |
541 | return r; | |
542 | ||
543 | return 0; | |
544 | } | |
545 | ||
bd57b450 TG |
546 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { |
547 | _cleanup_free_ DHCPPacket *packet = NULL; | |
548 | size_t offset; | |
549 | int r; | |
550 | ||
551 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); | |
552 | if (r < 0) | |
553 | return r; | |
554 | ||
b3ec603c | 555 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
bd57b450 TG |
556 | } |
557 | ||
a6f1e036 TG |
558 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
559 | be32_t gateway, uint8_t chaddr[]) { | |
52750344 TG |
560 | _cleanup_free_ DHCPPacket *packet = NULL; |
561 | size_t optoffset = 0; | |
562 | int r; | |
563 | ||
564 | assert(server); | |
565 | assert(address != INADDR_ANY); | |
566 | assert(chaddr); | |
567 | ||
568 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
569 | if (!packet) | |
570 | return -ENOMEM; | |
571 | ||
572 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
76253e73 DW |
573 | DHCP_FORCERENEW, ARPHRD_ETHER, |
574 | DHCP_MIN_OPTIONS_SIZE, &optoffset); | |
52750344 TG |
575 | if (r < 0) |
576 | return r; | |
577 | ||
578 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
579 | &optoffset, 0, DHCP_OPTION_END, 0, NULL); | |
580 | if (r < 0) | |
581 | return r; | |
582 | ||
583 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); | |
584 | ||
585 | r = dhcp_server_send_udp(server, address, &packet->dhcp, | |
586 | sizeof(DHCPMessage) + optoffset); | |
c15fb62a TA |
587 | if (r < 0) |
588 | return r; | |
52750344 TG |
589 | |
590 | return 0; | |
591 | } | |
592 | ||
b3ec603c | 593 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
89ca10c6 | 594 | DHCPRequest *req = userdata; |
816e2e7a TG |
595 | |
596 | assert(req); | |
597 | ||
598 | switch(code) { | |
c7d9ffe6 TG |
599 | case DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
600 | if (len == 4) | |
601 | req->lifetime = be32toh(*(be32_t*)option); | |
602 | ||
603 | break; | |
2dead812 TG |
604 | case DHCP_OPTION_REQUESTED_IP_ADDRESS: |
605 | if (len == 4) | |
606 | req->requested_ip = *(be32_t*)option; | |
607 | ||
608 | break; | |
816e2e7a TG |
609 | case DHCP_OPTION_SERVER_IDENTIFIER: |
610 | if (len == 4) | |
611 | req->server_id = *(be32_t*)option; | |
612 | ||
613 | break; | |
614 | case DHCP_OPTION_CLIENT_IDENTIFIER: | |
615 | if (len >= 2) { | |
616 | uint8_t *data; | |
617 | ||
618 | data = memdup(option, len); | |
619 | if (!data) | |
620 | return -ENOMEM; | |
621 | ||
622 | free(req->client_id.data); | |
623 | req->client_id.data = data; | |
624 | req->client_id.length = len; | |
625 | } | |
626 | ||
627 | break; | |
628 | case DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: | |
629 | if (len == 2) | |
630 | req->max_optlen = be16toh(*(be16_t*)option) - | |
631 | - sizeof(DHCPPacket); | |
632 | ||
633 | break; | |
634 | } | |
635 | ||
636 | return 0; | |
637 | } | |
638 | ||
639 | static void dhcp_request_free(DHCPRequest *req) { | |
640 | if (!req) | |
641 | return; | |
642 | ||
643 | free(req->client_id.data); | |
644 | free(req); | |
645 | } | |
646 | ||
647 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
648 | #define _cleanup_dhcp_request_free_ _cleanup_(dhcp_request_freep) | |
649 | ||
586ac6f7 | 650 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
816e2e7a TG |
651 | assert(req); |
652 | assert(message); | |
653 | ||
654 | req->message = message; | |
655 | ||
e2acdb6b | 656 | /* set client id based on MAC address if client did not send an explicit |
a6f1e036 | 657 | one */ |
816e2e7a | 658 | if (!req->client_id.data) { |
9a0f246f | 659 | void *data; |
816e2e7a | 660 | |
9a0f246f | 661 | data = malloc0(ETH_ALEN + 1); |
816e2e7a TG |
662 | if (!data) |
663 | return -ENOMEM; | |
664 | ||
9a0f246f LP |
665 | ((uint8_t*) data)[0] = 0x01; |
666 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN); | |
667 | ||
816e2e7a TG |
668 | req->client_id.length = ETH_ALEN + 1; |
669 | req->client_id.data = data; | |
816e2e7a TG |
670 | } |
671 | ||
672 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) | |
673 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
674 | ||
9a0f246f | 675 | if (req->lifetime <= 0) |
586ac6f7 LP |
676 | req->lifetime = MAX(1ULL, server->default_lease_time); |
677 | ||
678 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
679 | req->lifetime = server->max_lease_time; | |
c7d9ffe6 | 680 | |
816e2e7a TG |
681 | return 0; |
682 | } | |
683 | ||
87322b3a TG |
684 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { |
685 | assert(server); | |
686 | ||
687 | if (!server->pool_size) | |
688 | return -EINVAL; | |
689 | ||
99634696 TG |
690 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
691 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
692 | return -ERANGE; | |
87322b3a | 693 | |
99634696 | 694 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
87322b3a TG |
695 | } |
696 | ||
83cedf7a TG |
697 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
698 | ||
be077570 TG |
699 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, |
700 | size_t length) { | |
816e2e7a | 701 | _cleanup_dhcp_request_free_ DHCPRequest *req = NULL; |
87322b3a | 702 | DHCPLease *existing_lease; |
816e2e7a | 703 | int type, r; |
be077570 TG |
704 | |
705 | assert(server); | |
706 | assert(message); | |
707 | ||
708 | if (message->op != BOOTREQUEST || | |
709 | message->htype != ARPHRD_ETHER || | |
710 | message->hlen != ETHER_ADDR_LEN) | |
711 | return 0; | |
712 | ||
816e2e7a TG |
713 | req = new0(DHCPRequest, 1); |
714 | if (!req) | |
715 | return -ENOMEM; | |
716 | ||
717 | type = dhcp_option_parse(message, length, parse_request, req); | |
be077570 TG |
718 | if (type < 0) |
719 | return 0; | |
720 | ||
586ac6f7 | 721 | r = ensure_sane_request(server, req, message); |
816e2e7a TG |
722 | if (r < 0) |
723 | /* this only fails on critical errors */ | |
724 | return r; | |
725 | ||
a6f1e036 TG |
726 | existing_lease = hashmap_get(server->leases_by_client_id, |
727 | &req->client_id); | |
87322b3a | 728 | |
4dc35568 | 729 | switch(type) { |
9a0f246f LP |
730 | |
731 | case DHCP_DISCOVER: { | |
87322b3a TG |
732 | be32_t address = INADDR_ANY; |
733 | unsigned i; | |
2dead812 | 734 | |
4dc35568 TG |
735 | log_dhcp_server(server, "DISCOVER (0x%x)", |
736 | be32toh(req->message->xid)); | |
737 | ||
2dead812 TG |
738 | if (!server->pool_size) |
739 | /* no pool allocated */ | |
740 | return 0; | |
741 | ||
87322b3a TG |
742 | /* for now pick a random free address from the pool */ |
743 | if (existing_lease) | |
744 | address = existing_lease->address; | |
745 | else { | |
b826ab58 | 746 | struct siphash state; |
0cb3c286 | 747 | uint64_t hash; |
99634696 | 748 | uint32_t next_offer; |
83cedf7a TG |
749 | |
750 | /* even with no persistence of leases, we try to offer the same client | |
751 | the same IP address. we do this by using the hash of the client id | |
752 | as the offset into the pool of leases when finding the next free one */ | |
753 | ||
0cb3c286 | 754 | siphash24_init(&state, HASH_KEY.bytes); |
b826ab58 | 755 | client_id_hash_func(&req->client_id, &state); |
933f9cae | 756 | hash = htole64(siphash24_finalize(&state)); |
0cb3c286 | 757 | next_offer = hash % server->pool_size; |
83cedf7a | 758 | |
87322b3a | 759 | for (i = 0; i < server->pool_size; i++) { |
83cedf7a | 760 | if (!server->bound_leases[next_offer]) { |
99634696 | 761 | address = server->subnet | htobe32(server->pool_offset + next_offer); |
87322b3a TG |
762 | break; |
763 | } else | |
83cedf7a | 764 | next_offer = (next_offer + 1) % server->pool_size; |
87322b3a TG |
765 | } |
766 | } | |
767 | ||
768 | if (address == INADDR_ANY) | |
769 | /* no free addresses left */ | |
770 | return 0; | |
2dead812 TG |
771 | |
772 | r = server_send_offer(server, req, address); | |
4dc35568 TG |
773 | if (r < 0) { |
774 | /* this only fails on critical errors */ | |
775 | log_dhcp_server(server, "could not send offer: %s", | |
776 | strerror(-r)); | |
777 | return r; | |
778 | } else { | |
779 | log_dhcp_server(server, "OFFER (0x%x)", | |
780 | be32toh(req->message->xid)); | |
781 | return DHCP_OFFER; | |
782 | } | |
be077570 | 783 | |
4dc35568 TG |
784 | break; |
785 | } | |
5b34277c TG |
786 | case DHCP_DECLINE: |
787 | log_dhcp_server(server, "DECLINE (0x%x)", | |
788 | be32toh(req->message->xid)); | |
789 | ||
790 | /* TODO: make sure we don't offer this address again */ | |
791 | ||
792 | return 1; | |
793 | ||
9a0f246f | 794 | case DHCP_REQUEST: { |
2dead812 | 795 | be32_t address; |
bd57b450 | 796 | bool init_reboot = false; |
87322b3a | 797 | int pool_offset; |
2dead812 TG |
798 | |
799 | /* see RFC 2131, section 4.3.2 */ | |
800 | ||
801 | if (req->server_id) { | |
802 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", | |
803 | be32toh(req->message->xid)); | |
804 | ||
805 | /* SELECTING */ | |
806 | if (req->server_id != server->address) | |
807 | /* client did not pick us */ | |
808 | return 0; | |
809 | ||
810 | if (req->message->ciaddr) | |
811 | /* this MUST be zero */ | |
812 | return 0; | |
813 | ||
814 | if (!req->requested_ip) | |
815 | /* this must be filled in with the yiaddr | |
816 | from the chosen OFFER */ | |
817 | return 0; | |
818 | ||
819 | address = req->requested_ip; | |
820 | } else if (req->requested_ip) { | |
821 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", | |
822 | be32toh(req->message->xid)); | |
823 | ||
824 | /* INIT-REBOOT */ | |
825 | if (req->message->ciaddr) | |
826 | /* this MUST be zero */ | |
827 | return 0; | |
828 | ||
bd57b450 | 829 | /* TODO: check more carefully if IP is correct */ |
2dead812 | 830 | address = req->requested_ip; |
bd57b450 | 831 | init_reboot = true; |
2dead812 TG |
832 | } else { |
833 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
834 | be32toh(req->message->xid)); | |
835 | ||
836 | /* REBINDING / RENEWING */ | |
837 | if (!req->message->ciaddr) | |
838 | /* this MUST be filled in with clients IP address */ | |
839 | return 0; | |
840 | ||
841 | address = req->message->ciaddr; | |
842 | } | |
843 | ||
87322b3a TG |
844 | pool_offset = get_pool_offset(server, address); |
845 | ||
846 | /* verify that the requested address is from the pool, and either | |
847 | owned by the current client or free */ | |
848 | if (pool_offset >= 0 && | |
849 | server->bound_leases[pool_offset] == existing_lease) { | |
850 | DHCPLease *lease; | |
a7f7d1bd | 851 | usec_t time_now = 0; |
87322b3a TG |
852 | |
853 | if (!existing_lease) { | |
854 | lease = new0(DHCPLease, 1); | |
855 | lease->address = req->requested_ip; | |
856 | lease->client_id.data = memdup(req->client_id.data, | |
857 | req->client_id.length); | |
02557f97 TA |
858 | if (!lease->client_id.data) { |
859 | free(lease); | |
87322b3a | 860 | return -ENOMEM; |
02557f97 | 861 | } |
87322b3a | 862 | lease->client_id.length = req->client_id.length; |
a6f1e036 TG |
863 | memcpy(&lease->chaddr, &req->message->chaddr, |
864 | ETH_ALEN); | |
52750344 | 865 | lease->gateway = req->message->giaddr; |
87322b3a TG |
866 | } else |
867 | lease = existing_lease; | |
868 | ||
a6f1e036 TG |
869 | r = sd_event_now(server->event, |
870 | clock_boottime_or_monotonic(), | |
871 | &time_now); | |
bff92d2c SS |
872 | if (r < 0) { |
873 | if (!existing_lease) | |
874 | dhcp_lease_free(lease); | |
38a03f06 | 875 | return r; |
bff92d2c SS |
876 | } |
877 | ||
87322b3a TG |
878 | lease->expiration = req->lifetime * USEC_PER_SEC + time_now; |
879 | ||
2dead812 TG |
880 | r = server_send_ack(server, req, address); |
881 | if (r < 0) { | |
882 | /* this only fails on critical errors */ | |
883 | log_dhcp_server(server, "could not send ack: %s", | |
884 | strerror(-r)); | |
87322b3a TG |
885 | |
886 | if (!existing_lease) | |
887 | dhcp_lease_free(lease); | |
888 | ||
2dead812 TG |
889 | return r; |
890 | } else { | |
891 | log_dhcp_server(server, "ACK (0x%x)", | |
892 | be32toh(req->message->xid)); | |
87322b3a TG |
893 | |
894 | server->bound_leases[pool_offset] = lease; | |
a6f1e036 TG |
895 | hashmap_put(server->leases_by_client_id, |
896 | &lease->client_id, lease); | |
87322b3a | 897 | |
2dead812 TG |
898 | return DHCP_ACK; |
899 | } | |
bd57b450 TG |
900 | } else if (init_reboot) { |
901 | r = server_send_nak(server, req); | |
902 | if (r < 0) { | |
903 | /* this only fails on critical errors */ | |
904 | log_dhcp_server(server, "could not send nak: %s", | |
905 | strerror(-r)); | |
906 | return r; | |
907 | } else { | |
908 | log_dhcp_server(server, "NAK (0x%x)", | |
909 | be32toh(req->message->xid)); | |
910 | return DHCP_NAK; | |
911 | } | |
912 | } | |
2dead812 TG |
913 | |
914 | break; | |
915 | } | |
9a0f246f | 916 | |
500792d8 TG |
917 | case DHCP_RELEASE: { |
918 | int pool_offset; | |
919 | ||
920 | log_dhcp_server(server, "RELEASE (0x%x)", | |
921 | be32toh(req->message->xid)); | |
922 | ||
923 | if (!existing_lease) | |
924 | return 0; | |
925 | ||
926 | if (existing_lease->address != req->message->ciaddr) | |
927 | return 0; | |
928 | ||
929 | pool_offset = get_pool_offset(server, req->message->ciaddr); | |
930 | if (pool_offset < 0) | |
931 | return 0; | |
932 | ||
933 | if (server->bound_leases[pool_offset] == existing_lease) { | |
934 | server->bound_leases[pool_offset] = NULL; | |
935 | hashmap_remove(server->leases_by_client_id, existing_lease); | |
936 | dhcp_lease_free(existing_lease); | |
937 | ||
938 | return 1; | |
939 | } else | |
940 | return 0; | |
941 | } | |
2dead812 | 942 | } |
4dc35568 TG |
943 | |
944 | return 0; | |
be077570 TG |
945 | } |
946 | ||
ff734080 TG |
947 | static int server_receive_message(sd_event_source *s, int fd, |
948 | uint32_t revents, void *userdata) { | |
be077570 | 949 | _cleanup_free_ DHCPMessage *message = NULL; |
3a864fe4 | 950 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))]; |
ff734080 TG |
951 | sd_dhcp_server *server = userdata; |
952 | struct iovec iov = {}; | |
953 | struct msghdr msg = { | |
954 | .msg_iov = &iov, | |
955 | .msg_iovlen = 1, | |
3a864fe4 TG |
956 | .msg_control = cmsgbuf, |
957 | .msg_controllen = sizeof(cmsgbuf), | |
ff734080 | 958 | }; |
3a864fe4 | 959 | struct cmsghdr *cmsg; |
966d74c0 | 960 | int buflen = 0, len; |
ff734080 TG |
961 | |
962 | assert(server); | |
963 | ||
966d74c0 LP |
964 | if (ioctl(fd, FIONREAD, &buflen) < 0) |
965 | return -errno; | |
ff734080 TG |
966 | if (buflen < 0) |
967 | return -EIO; | |
968 | ||
969 | message = malloc0(buflen); | |
970 | if (!message) | |
971 | return -ENOMEM; | |
972 | ||
973 | iov.iov_base = message; | |
974 | iov.iov_len = buflen; | |
975 | ||
a38d9945 | 976 | len = recvmsg(fd, &msg, 0); |
ff734080 TG |
977 | if (len < buflen) |
978 | return 0; | |
be077570 TG |
979 | else if ((size_t)len < sizeof(DHCPMessage)) |
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 | } |