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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" | |
9ae84244 | 32 | #include "unaligned.h" |
b44cd882 | 33 | |
586ac6f7 LP |
34 | #define DHCP_DEFAULT_LEASE_TIME_USEC USEC_PER_HOUR |
35 | #define DHCP_MAX_LEASE_TIME_USEC (USEC_PER_HOUR*12) | |
4dc35568 | 36 | |
99634696 TG |
37 | /* configures the server's address and subnet, and optionally the pool's size and offset into the subnet |
38 | * the whole pool must fit into the subnet, and may not contain the first (any) nor last (broadcast) address | |
39 | * moreover, the server's own address may be in the pool, and is in that case reserved in order not to | |
40 | * accidentally hand it out */ | |
41 | int sd_dhcp_server_configure_pool(sd_dhcp_server *server, struct in_addr *address, unsigned char prefixlen, uint32_t offset, uint32_t size) { | |
42 | struct in_addr netmask_addr; | |
43 | be32_t netmask; | |
44 | uint32_t server_off, broadcast_off, size_max; | |
45 | ||
2dead812 TG |
46 | assert_return(server, -EINVAL); |
47 | assert_return(address, -EINVAL); | |
99634696 TG |
48 | assert_return(address->s_addr != INADDR_ANY, -EINVAL); |
49 | assert_return(prefixlen <= 32, -ERANGE); | |
50 | assert_return(server->address == INADDR_ANY, -EBUSY); | |
51 | ||
52 | assert_se(in_addr_prefixlen_to_netmask(&netmask_addr, prefixlen)); | |
53 | netmask = netmask_addr.s_addr; | |
54 | ||
55 | server_off = be32toh(address->s_addr & ~netmask); | |
56 | broadcast_off = be32toh(~netmask); | |
57 | ||
58 | /* the server address cannot be the subnet address */ | |
59 | assert_return(server_off != 0, -ERANGE); | |
60 | ||
61 | /* nor the broadcast address */ | |
62 | assert_return(server_off != broadcast_off, -ERANGE); | |
63 | ||
64 | /* 0 offset means we should set a default, we skip the first (subnet) address | |
65 | and take the next one */ | |
66 | if (offset == 0) | |
67 | offset = 1; | |
68 | ||
69 | size_max = (broadcast_off + 1) /* the number of addresses in the subnet */ | |
70 | - offset /* exclude the addresses before the offset */ | |
71 | - 1; /* exclude the last (broadcast) address */ | |
72 | ||
73 | /* The pool must contain at least one address */ | |
74 | assert_return(size_max >= 1, -ERANGE); | |
75 | ||
76 | if (size != 0) | |
77 | assert_return(size <= size_max, -ERANGE); | |
78 | else | |
79 | size = size_max; | |
87322b3a TG |
80 | |
81 | server->bound_leases = new0(DHCPLease*, size); | |
82 | if (!server->bound_leases) | |
83 | return -ENOMEM; | |
2dead812 | 84 | |
99634696 | 85 | server->pool_offset = offset; |
2dead812 TG |
86 | server->pool_size = size; |
87 | ||
20af7091 | 88 | server->address = address->s_addr; |
99634696 TG |
89 | server->netmask = netmask; |
90 | server->subnet = address->s_addr & netmask; | |
91 | ||
92 | if (server_off >= offset && server_off - offset < size) | |
93 | server->bound_leases[server_off - offset] = &server->invalid_lease; | |
20af7091 TG |
94 | |
95 | return 0; | |
96 | } | |
97 | ||
04c01369 | 98 | int sd_dhcp_server_is_running(sd_dhcp_server *server) { |
75677581 | 99 | assert_return(server, false); |
7c16313f TG |
100 | |
101 | return !!server->receive_message; | |
102 | } | |
103 | ||
b44cd882 | 104 | sd_dhcp_server *sd_dhcp_server_ref(sd_dhcp_server *server) { |
3733eec3 LP |
105 | |
106 | if (!server) | |
107 | return NULL; | |
108 | ||
109 | assert(server->n_ref >= 1); | |
110 | server->n_ref++; | |
b44cd882 TG |
111 | |
112 | return server; | |
113 | } | |
114 | ||
b826ab58 | 115 | void client_id_hash_func(const void *p, struct siphash *state) { |
87322b3a TG |
116 | const DHCPClientId *id = p; |
117 | ||
118 | assert(id); | |
119 | assert(id->length); | |
120 | assert(id->data); | |
121 | ||
1e2527a6 | 122 | siphash24_compress(&id->length, sizeof(id->length), state); |
b826ab58 | 123 | siphash24_compress(id->data, id->length, state); |
87322b3a TG |
124 | } |
125 | ||
126 | int client_id_compare_func(const void *_a, const void *_b) { | |
127 | const DHCPClientId *a, *b; | |
128 | ||
129 | a = _a; | |
130 | b = _b; | |
131 | ||
132 | assert(!a->length || a->data); | |
133 | assert(!b->length || b->data); | |
134 | ||
135 | if (a->length != b->length) | |
136 | return a->length < b->length ? -1 : 1; | |
137 | ||
138 | return memcmp(a->data, b->data, a->length); | |
139 | } | |
140 | ||
d5099efc MS |
141 | static const struct hash_ops client_id_hash_ops = { |
142 | .hash = client_id_hash_func, | |
143 | .compare = client_id_compare_func | |
144 | }; | |
145 | ||
87322b3a TG |
146 | static void dhcp_lease_free(DHCPLease *lease) { |
147 | if (!lease) | |
148 | return; | |
149 | ||
150 | free(lease->client_id.data); | |
151 | free(lease); | |
152 | } | |
153 | ||
b44cd882 | 154 | sd_dhcp_server *sd_dhcp_server_unref(sd_dhcp_server *server) { |
3bdace9b | 155 | DHCPLease *lease; |
87322b3a | 156 | |
3bdace9b LP |
157 | if (!server) |
158 | return NULL; | |
b44cd882 | 159 | |
3733eec3 LP |
160 | assert(server->n_ref >= 1); |
161 | server->n_ref--; | |
162 | ||
163 | if (server->n_ref > 0) | |
3bdace9b | 164 | return NULL; |
ff734080 | 165 | |
3bdace9b | 166 | log_dhcp_server(server, "UNREF"); |
87322b3a | 167 | |
3bdace9b | 168 | sd_dhcp_server_stop(server); |
87322b3a | 169 | |
3bdace9b LP |
170 | sd_event_unref(server->event); |
171 | ||
8eb9058d | 172 | free(server->timezone); |
1a04db0f LP |
173 | free(server->dns); |
174 | free(server->ntp); | |
8eb9058d | 175 | |
3bdace9b LP |
176 | while ((lease = hashmap_steal_first(server->leases_by_client_id))) |
177 | dhcp_lease_free(lease); | |
178 | hashmap_free(server->leases_by_client_id); | |
179 | ||
180 | free(server->bound_leases); | |
6b430fdb | 181 | return mfree(server); |
b44cd882 TG |
182 | } |
183 | ||
3a864fe4 | 184 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
4afd3348 | 185 | _cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL; |
b44cd882 TG |
186 | |
187 | assert_return(ret, -EINVAL); | |
3a864fe4 | 188 | assert_return(ifindex > 0, -EINVAL); |
b44cd882 TG |
189 | |
190 | server = new0(sd_dhcp_server, 1); | |
191 | if (!server) | |
192 | return -ENOMEM; | |
193 | ||
3733eec3 | 194 | server->n_ref = 1; |
8de4a226 | 195 | server->fd_raw = -1; |
ff734080 | 196 | server->fd = -1; |
20af7091 | 197 | server->address = htobe32(INADDR_ANY); |
59b8f6b6 | 198 | server->netmask = htobe32(INADDR_ANY); |
b3ec603c | 199 | server->ifindex = ifindex; |
d5099efc | 200 | server->leases_by_client_id = hashmap_new(&client_id_hash_ops); |
586ac6f7 LP |
201 | server->default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC); |
202 | server->max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC); | |
b44cd882 TG |
203 | |
204 | *ret = server; | |
205 | server = NULL; | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
32d20645 | 210 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int64_t priority) { |
b44cd882 TG |
211 | int r; |
212 | ||
213 | assert_return(server, -EINVAL); | |
214 | assert_return(!server->event, -EBUSY); | |
215 | ||
216 | if (event) | |
217 | server->event = sd_event_ref(event); | |
218 | else { | |
219 | r = sd_event_default(&server->event); | |
220 | if (r < 0) | |
221 | return r; | |
222 | } | |
223 | ||
224 | server->event_priority = priority; | |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
229 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
230 | assert_return(server, -EINVAL); | |
231 | ||
232 | server->event = sd_event_unref(server->event); | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
238 | assert_return(server, NULL); | |
239 | ||
240 | return server->event; | |
241 | } | |
ff734080 TG |
242 | |
243 | int sd_dhcp_server_stop(sd_dhcp_server *server) { | |
244 | assert_return(server, -EINVAL); | |
245 | ||
246 | server->receive_message = | |
247 | sd_event_source_unref(server->receive_message); | |
248 | ||
8de4a226 | 249 | server->fd_raw = safe_close(server->fd_raw); |
ff734080 TG |
250 | server->fd = safe_close(server->fd); |
251 | ||
252 | log_dhcp_server(server, "STOPPED"); | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
a6f1e036 TG |
257 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
258 | DHCPPacket *packet, size_t len) { | |
969b009d TG |
259 | union sockaddr_union link = { |
260 | .ll.sll_family = AF_PACKET, | |
8e38570e | 261 | .ll.sll_protocol = htobe16(ETH_P_IP), |
b3ec603c | 262 | .ll.sll_ifindex = server->ifindex, |
969b009d TG |
263 | .ll.sll_halen = ETH_ALEN, |
264 | }; | |
969b009d TG |
265 | |
266 | assert(server); | |
b3ec603c | 267 | assert(server->ifindex > 0); |
969b009d TG |
268 | assert(server->address); |
269 | assert(packet); | |
270 | assert(len > sizeof(DHCPPacket)); | |
271 | ||
272 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN); | |
273 | ||
274 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, | |
a6f1e036 TG |
275 | packet->dhcp.yiaddr, |
276 | DHCP_PORT_CLIENT, len); | |
969b009d | 277 | |
b3ec603c | 278 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
969b009d TG |
279 | } |
280 | ||
281 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
8eb7b6a5 | 282 | uint16_t destination_port, |
969b009d TG |
283 | DHCPMessage *message, size_t len) { |
284 | union sockaddr_union dest = { | |
285 | .in.sin_family = AF_INET, | |
8eb7b6a5 | 286 | .in.sin_port = htobe16(destination_port), |
969b009d TG |
287 | .in.sin_addr.s_addr = destination, |
288 | }; | |
289 | struct iovec iov = { | |
290 | .iov_base = message, | |
291 | .iov_len = len, | |
292 | }; | |
293 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))] = {}; | |
294 | struct msghdr msg = { | |
295 | .msg_name = &dest, | |
296 | .msg_namelen = sizeof(dest.in), | |
297 | .msg_iov = &iov, | |
298 | .msg_iovlen = 1, | |
299 | .msg_control = cmsgbuf, | |
300 | .msg_controllen = sizeof(cmsgbuf), | |
301 | }; | |
302 | struct cmsghdr *cmsg; | |
303 | struct in_pktinfo *pktinfo; | |
304 | int r; | |
305 | ||
306 | assert(server); | |
307 | assert(server->fd > 0); | |
308 | assert(message); | |
309 | assert(len > sizeof(DHCPMessage)); | |
310 | ||
311 | cmsg = CMSG_FIRSTHDR(&msg); | |
312 | assert(cmsg); | |
313 | ||
314 | cmsg->cmsg_level = IPPROTO_IP; | |
315 | cmsg->cmsg_type = IP_PKTINFO; | |
316 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
317 | ||
318 | /* we attach source interface and address info to the message | |
319 | rather than binding the socket. This will be mostly useful | |
320 | when we gain support for arbitrary number of server addresses | |
321 | */ | |
322 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
323 | assert(pktinfo); | |
324 | ||
b3ec603c | 325 | pktinfo->ipi_ifindex = server->ifindex; |
969b009d TG |
326 | pktinfo->ipi_spec_dst.s_addr = server->address; |
327 | ||
328 | r = sendmsg(server->fd, &msg, 0); | |
329 | if (r < 0) | |
330 | return -errno; | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | static bool requested_broadcast(DHCPRequest *req) { | |
336 | assert(req); | |
337 | ||
338 | return req->message->flags & htobe16(0x8000); | |
339 | } | |
340 | ||
341 | int dhcp_server_send_packet(sd_dhcp_server *server, | |
342 | DHCPRequest *req, DHCPPacket *packet, | |
343 | int type, size_t optoffset) { | |
344 | be32_t destination = INADDR_ANY; | |
8eb7b6a5 | 345 | uint16_t destination_port = DHCP_PORT_CLIENT; |
969b009d TG |
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; | |
8eb7b6a5 | 390 | destination_port = DHCP_PORT_SERVER; |
969b009d TG |
391 | if (type == DHCP_NAK) |
392 | packet->dhcp.flags = htobe16(0x8000); | |
393 | } else if (req->message->ciaddr && type != DHCP_NAK) | |
394 | destination = req->message->ciaddr; | |
395 | ||
d6bd972d | 396 | if (destination != INADDR_ANY) |
8eb7b6a5 PF |
397 | return dhcp_server_send_udp(server, destination, |
398 | destination_port, &packet->dhcp, | |
969b009d | 399 | sizeof(DHCPMessage) + optoffset); |
d6bd972d | 400 | else if (requested_broadcast(req) || type == DHCP_NAK) |
a6f1e036 | 401 | return dhcp_server_send_udp(server, INADDR_BROADCAST, |
8eb7b6a5 | 402 | destination_port, &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, |
22805d92 | 460 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 461 | &lease_time); |
4dc35568 TG |
462 | if (r < 0) |
463 | return r; | |
464 | ||
59b8f6b6 | 465 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 466 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
467 | if (r < 0) |
468 | return r; | |
469 | ||
77ff6022 CG |
470 | if (server->emit_router) { |
471 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
472 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
473 | if (r < 0) | |
474 | return r; | |
475 | } | |
59b8f6b6 | 476 | |
4dc35568 TG |
477 | r = dhcp_server_send_packet(server, req, packet, DHCP_OFFER, offset); |
478 | if (r < 0) | |
479 | return r; | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
a6f1e036 TG |
484 | static int server_send_ack(sd_dhcp_server *server, DHCPRequest *req, |
485 | be32_t address) { | |
2dead812 TG |
486 | _cleanup_free_ DHCPPacket *packet = NULL; |
487 | size_t offset; | |
488 | be32_t lease_time; | |
489 | int r; | |
490 | ||
491 | r = server_message_init(server, &packet, DHCP_ACK, &offset, req); | |
492 | if (r < 0) | |
493 | return r; | |
494 | ||
495 | packet->dhcp.yiaddr = address; | |
496 | ||
c7d9ffe6 | 497 | lease_time = htobe32(req->lifetime); |
2dead812 | 498 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 499 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 500 | &lease_time); |
2dead812 TG |
501 | if (r < 0) |
502 | return r; | |
503 | ||
59b8f6b6 | 504 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 505 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
506 | if (r < 0) |
507 | return r; | |
508 | ||
77ff6022 CG |
509 | if (server->emit_router) { |
510 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
511 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
512 | if (r < 0) | |
513 | return r; | |
514 | } | |
59b8f6b6 | 515 | |
1a04db0f LP |
516 | if (server->n_dns > 0) { |
517 | r = dhcp_option_append( | |
518 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 519 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, |
1a04db0f LP |
520 | sizeof(struct in_addr) * server->n_dns, server->dns); |
521 | if (r < 0) | |
522 | return r; | |
523 | } | |
524 | ||
525 | if (server->n_ntp > 0) { | |
526 | r = dhcp_option_append( | |
527 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 528 | SD_DHCP_OPTION_NTP_SERVER, |
1a04db0f LP |
529 | sizeof(struct in_addr) * server->n_ntp, server->ntp); |
530 | if (r < 0) | |
531 | return r; | |
532 | } | |
533 | ||
8eb9058d LP |
534 | if (server->timezone) { |
535 | r = dhcp_option_append( | |
536 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 537 | SD_DHCP_OPTION_NEW_TZDB_TIMEZONE, |
8eb9058d LP |
538 | strlen(server->timezone), server->timezone); |
539 | if (r < 0) | |
540 | return r; | |
541 | } | |
542 | ||
2dead812 TG |
543 | r = dhcp_server_send_packet(server, req, packet, DHCP_ACK, offset); |
544 | if (r < 0) | |
545 | return r; | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
bd57b450 TG |
550 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { |
551 | _cleanup_free_ DHCPPacket *packet = NULL; | |
552 | size_t offset; | |
553 | int r; | |
554 | ||
555 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); | |
556 | if (r < 0) | |
557 | return r; | |
558 | ||
b3ec603c | 559 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
bd57b450 TG |
560 | } |
561 | ||
a6f1e036 TG |
562 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
563 | be32_t gateway, uint8_t chaddr[]) { | |
52750344 TG |
564 | _cleanup_free_ DHCPPacket *packet = NULL; |
565 | size_t optoffset = 0; | |
566 | int r; | |
567 | ||
568 | assert(server); | |
569 | assert(address != INADDR_ANY); | |
570 | assert(chaddr); | |
571 | ||
572 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
573 | if (!packet) | |
574 | return -ENOMEM; | |
575 | ||
576 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
76253e73 DW |
577 | DHCP_FORCERENEW, ARPHRD_ETHER, |
578 | DHCP_MIN_OPTIONS_SIZE, &optoffset); | |
52750344 TG |
579 | if (r < 0) |
580 | return r; | |
581 | ||
582 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
22805d92 | 583 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL); |
52750344 TG |
584 | if (r < 0) |
585 | return r; | |
586 | ||
587 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); | |
588 | ||
8eb7b6a5 PF |
589 | r = dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, |
590 | &packet->dhcp, | |
52750344 | 591 | sizeof(DHCPMessage) + optoffset); |
c15fb62a TA |
592 | if (r < 0) |
593 | return r; | |
52750344 TG |
594 | |
595 | return 0; | |
596 | } | |
597 | ||
b3ec603c | 598 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
89ca10c6 | 599 | DHCPRequest *req = userdata; |
816e2e7a TG |
600 | |
601 | assert(req); | |
602 | ||
603 | switch(code) { | |
22805d92 | 604 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
c7d9ffe6 | 605 | if (len == 4) |
9ae84244 | 606 | req->lifetime = unaligned_read_be32(option); |
c7d9ffe6 TG |
607 | |
608 | break; | |
22805d92 | 609 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
2dead812 | 610 | if (len == 4) |
9ae84244 | 611 | memcpy(&req->requested_ip, option, sizeof(be32_t)); |
2dead812 TG |
612 | |
613 | break; | |
22805d92 | 614 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
816e2e7a | 615 | if (len == 4) |
9ae84244 | 616 | memcpy(&req->server_id, option, sizeof(be32_t)); |
816e2e7a TG |
617 | |
618 | break; | |
22805d92 | 619 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
816e2e7a TG |
620 | if (len >= 2) { |
621 | uint8_t *data; | |
622 | ||
623 | data = memdup(option, len); | |
624 | if (!data) | |
625 | return -ENOMEM; | |
626 | ||
627 | free(req->client_id.data); | |
628 | req->client_id.data = data; | |
629 | req->client_id.length = len; | |
630 | } | |
631 | ||
632 | break; | |
22805d92 | 633 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
76a9d0f1 LP |
634 | |
635 | if (len == 2 && unaligned_read_be16(option) >= sizeof(DHCPPacket)) | |
9ae84244 | 636 | req->max_optlen = unaligned_read_be16(option) - sizeof(DHCPPacket); |
816e2e7a TG |
637 | |
638 | break; | |
639 | } | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
644 | static void dhcp_request_free(DHCPRequest *req) { | |
645 | if (!req) | |
646 | return; | |
647 | ||
648 | free(req->client_id.data); | |
649 | free(req); | |
650 | } | |
651 | ||
652 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
653 | #define _cleanup_dhcp_request_free_ _cleanup_(dhcp_request_freep) | |
654 | ||
586ac6f7 | 655 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
816e2e7a TG |
656 | assert(req); |
657 | assert(message); | |
658 | ||
659 | req->message = message; | |
660 | ||
e2acdb6b | 661 | /* set client id based on MAC address if client did not send an explicit |
a6f1e036 | 662 | one */ |
816e2e7a | 663 | if (!req->client_id.data) { |
9a0f246f | 664 | void *data; |
816e2e7a | 665 | |
9a0f246f | 666 | data = malloc0(ETH_ALEN + 1); |
816e2e7a TG |
667 | if (!data) |
668 | return -ENOMEM; | |
669 | ||
9a0f246f LP |
670 | ((uint8_t*) data)[0] = 0x01; |
671 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN); | |
672 | ||
816e2e7a TG |
673 | req->client_id.length = ETH_ALEN + 1; |
674 | req->client_id.data = data; | |
816e2e7a TG |
675 | } |
676 | ||
677 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) | |
678 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
679 | ||
9a0f246f | 680 | if (req->lifetime <= 0) |
586ac6f7 LP |
681 | req->lifetime = MAX(1ULL, server->default_lease_time); |
682 | ||
683 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
684 | req->lifetime = server->max_lease_time; | |
c7d9ffe6 | 685 | |
816e2e7a TG |
686 | return 0; |
687 | } | |
688 | ||
87322b3a TG |
689 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { |
690 | assert(server); | |
691 | ||
692 | if (!server->pool_size) | |
693 | return -EINVAL; | |
694 | ||
99634696 TG |
695 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
696 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
697 | return -ERANGE; | |
87322b3a | 698 | |
99634696 | 699 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
87322b3a TG |
700 | } |
701 | ||
83cedf7a TG |
702 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
703 | ||
be077570 TG |
704 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, |
705 | size_t length) { | |
816e2e7a | 706 | _cleanup_dhcp_request_free_ DHCPRequest *req = NULL; |
f693e9b3 | 707 | _cleanup_free_ char *error_message = NULL; |
87322b3a | 708 | DHCPLease *existing_lease; |
816e2e7a | 709 | int type, r; |
be077570 TG |
710 | |
711 | assert(server); | |
712 | assert(message); | |
713 | ||
714 | if (message->op != BOOTREQUEST || | |
715 | message->htype != ARPHRD_ETHER || | |
716 | message->hlen != ETHER_ADDR_LEN) | |
717 | return 0; | |
718 | ||
816e2e7a TG |
719 | req = new0(DHCPRequest, 1); |
720 | if (!req) | |
721 | return -ENOMEM; | |
722 | ||
f693e9b3 | 723 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
be077570 TG |
724 | if (type < 0) |
725 | return 0; | |
726 | ||
586ac6f7 | 727 | r = ensure_sane_request(server, req, message); |
816e2e7a TG |
728 | if (r < 0) |
729 | /* this only fails on critical errors */ | |
730 | return r; | |
731 | ||
a6f1e036 TG |
732 | existing_lease = hashmap_get(server->leases_by_client_id, |
733 | &req->client_id); | |
87322b3a | 734 | |
4dc35568 | 735 | switch(type) { |
9a0f246f LP |
736 | |
737 | case DHCP_DISCOVER: { | |
87322b3a TG |
738 | be32_t address = INADDR_ANY; |
739 | unsigned i; | |
2dead812 | 740 | |
4dc35568 TG |
741 | log_dhcp_server(server, "DISCOVER (0x%x)", |
742 | be32toh(req->message->xid)); | |
743 | ||
2dead812 TG |
744 | if (!server->pool_size) |
745 | /* no pool allocated */ | |
746 | return 0; | |
747 | ||
87322b3a TG |
748 | /* for now pick a random free address from the pool */ |
749 | if (existing_lease) | |
750 | address = existing_lease->address; | |
751 | else { | |
b826ab58 | 752 | struct siphash state; |
0cb3c286 | 753 | uint64_t hash; |
99634696 | 754 | uint32_t next_offer; |
83cedf7a TG |
755 | |
756 | /* even with no persistence of leases, we try to offer the same client | |
757 | the same IP address. we do this by using the hash of the client id | |
758 | as the offset into the pool of leases when finding the next free one */ | |
759 | ||
0cb3c286 | 760 | siphash24_init(&state, HASH_KEY.bytes); |
b826ab58 | 761 | client_id_hash_func(&req->client_id, &state); |
933f9cae | 762 | hash = htole64(siphash24_finalize(&state)); |
0cb3c286 | 763 | next_offer = hash % server->pool_size; |
83cedf7a | 764 | |
87322b3a | 765 | for (i = 0; i < server->pool_size; i++) { |
83cedf7a | 766 | if (!server->bound_leases[next_offer]) { |
99634696 | 767 | address = server->subnet | htobe32(server->pool_offset + next_offer); |
87322b3a TG |
768 | break; |
769 | } else | |
83cedf7a | 770 | next_offer = (next_offer + 1) % server->pool_size; |
87322b3a TG |
771 | } |
772 | } | |
773 | ||
774 | if (address == INADDR_ANY) | |
775 | /* no free addresses left */ | |
776 | return 0; | |
2dead812 TG |
777 | |
778 | r = server_send_offer(server, req, address); | |
4dc35568 TG |
779 | if (r < 0) { |
780 | /* this only fails on critical errors */ | |
781 | log_dhcp_server(server, "could not send offer: %s", | |
782 | strerror(-r)); | |
783 | return r; | |
784 | } else { | |
785 | log_dhcp_server(server, "OFFER (0x%x)", | |
786 | be32toh(req->message->xid)); | |
787 | return DHCP_OFFER; | |
788 | } | |
be077570 | 789 | |
4dc35568 TG |
790 | break; |
791 | } | |
5b34277c | 792 | case DHCP_DECLINE: |
f693e9b3 | 793 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message)); |
5b34277c TG |
794 | |
795 | /* TODO: make sure we don't offer this address again */ | |
796 | ||
797 | return 1; | |
798 | ||
9a0f246f | 799 | case DHCP_REQUEST: { |
2dead812 | 800 | be32_t address; |
bd57b450 | 801 | bool init_reboot = false; |
87322b3a | 802 | int pool_offset; |
2dead812 TG |
803 | |
804 | /* see RFC 2131, section 4.3.2 */ | |
805 | ||
806 | if (req->server_id) { | |
807 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", | |
808 | be32toh(req->message->xid)); | |
809 | ||
810 | /* SELECTING */ | |
811 | if (req->server_id != server->address) | |
812 | /* client did not pick us */ | |
813 | return 0; | |
814 | ||
815 | if (req->message->ciaddr) | |
816 | /* this MUST be zero */ | |
817 | return 0; | |
818 | ||
819 | if (!req->requested_ip) | |
820 | /* this must be filled in with the yiaddr | |
821 | from the chosen OFFER */ | |
822 | return 0; | |
823 | ||
824 | address = req->requested_ip; | |
825 | } else if (req->requested_ip) { | |
826 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", | |
827 | be32toh(req->message->xid)); | |
828 | ||
829 | /* INIT-REBOOT */ | |
830 | if (req->message->ciaddr) | |
831 | /* this MUST be zero */ | |
832 | return 0; | |
833 | ||
bd57b450 | 834 | /* TODO: check more carefully if IP is correct */ |
2dead812 | 835 | address = req->requested_ip; |
bd57b450 | 836 | init_reboot = true; |
2dead812 TG |
837 | } else { |
838 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
839 | be32toh(req->message->xid)); | |
840 | ||
841 | /* REBINDING / RENEWING */ | |
842 | if (!req->message->ciaddr) | |
843 | /* this MUST be filled in with clients IP address */ | |
844 | return 0; | |
845 | ||
846 | address = req->message->ciaddr; | |
847 | } | |
848 | ||
87322b3a TG |
849 | pool_offset = get_pool_offset(server, address); |
850 | ||
851 | /* verify that the requested address is from the pool, and either | |
852 | owned by the current client or free */ | |
853 | if (pool_offset >= 0 && | |
854 | server->bound_leases[pool_offset] == existing_lease) { | |
855 | DHCPLease *lease; | |
a7f7d1bd | 856 | usec_t time_now = 0; |
87322b3a TG |
857 | |
858 | if (!existing_lease) { | |
859 | lease = new0(DHCPLease, 1); | |
860 | lease->address = req->requested_ip; | |
861 | lease->client_id.data = memdup(req->client_id.data, | |
862 | req->client_id.length); | |
02557f97 TA |
863 | if (!lease->client_id.data) { |
864 | free(lease); | |
87322b3a | 865 | return -ENOMEM; |
02557f97 | 866 | } |
87322b3a | 867 | lease->client_id.length = req->client_id.length; |
a6f1e036 TG |
868 | memcpy(&lease->chaddr, &req->message->chaddr, |
869 | ETH_ALEN); | |
52750344 | 870 | lease->gateway = req->message->giaddr; |
87322b3a TG |
871 | } else |
872 | lease = existing_lease; | |
873 | ||
a6f1e036 TG |
874 | r = sd_event_now(server->event, |
875 | clock_boottime_or_monotonic(), | |
876 | &time_now); | |
bff92d2c SS |
877 | if (r < 0) { |
878 | if (!existing_lease) | |
879 | dhcp_lease_free(lease); | |
38a03f06 | 880 | return r; |
bff92d2c SS |
881 | } |
882 | ||
87322b3a TG |
883 | lease->expiration = req->lifetime * USEC_PER_SEC + time_now; |
884 | ||
2dead812 TG |
885 | r = server_send_ack(server, req, address); |
886 | if (r < 0) { | |
887 | /* this only fails on critical errors */ | |
888 | log_dhcp_server(server, "could not send ack: %s", | |
889 | strerror(-r)); | |
87322b3a TG |
890 | |
891 | if (!existing_lease) | |
892 | dhcp_lease_free(lease); | |
893 | ||
2dead812 TG |
894 | return r; |
895 | } else { | |
896 | log_dhcp_server(server, "ACK (0x%x)", | |
897 | be32toh(req->message->xid)); | |
87322b3a TG |
898 | |
899 | server->bound_leases[pool_offset] = lease; | |
a6f1e036 TG |
900 | hashmap_put(server->leases_by_client_id, |
901 | &lease->client_id, lease); | |
87322b3a | 902 | |
2dead812 TG |
903 | return DHCP_ACK; |
904 | } | |
bd57b450 TG |
905 | } else if (init_reboot) { |
906 | r = server_send_nak(server, req); | |
907 | if (r < 0) { | |
908 | /* this only fails on critical errors */ | |
909 | log_dhcp_server(server, "could not send nak: %s", | |
910 | strerror(-r)); | |
911 | return r; | |
912 | } else { | |
913 | log_dhcp_server(server, "NAK (0x%x)", | |
914 | be32toh(req->message->xid)); | |
915 | return DHCP_NAK; | |
916 | } | |
917 | } | |
2dead812 TG |
918 | |
919 | break; | |
920 | } | |
9a0f246f | 921 | |
500792d8 TG |
922 | case DHCP_RELEASE: { |
923 | int pool_offset; | |
924 | ||
925 | log_dhcp_server(server, "RELEASE (0x%x)", | |
926 | be32toh(req->message->xid)); | |
927 | ||
928 | if (!existing_lease) | |
929 | return 0; | |
930 | ||
931 | if (existing_lease->address != req->message->ciaddr) | |
932 | return 0; | |
933 | ||
934 | pool_offset = get_pool_offset(server, req->message->ciaddr); | |
935 | if (pool_offset < 0) | |
936 | return 0; | |
937 | ||
938 | if (server->bound_leases[pool_offset] == existing_lease) { | |
939 | server->bound_leases[pool_offset] = NULL; | |
940 | hashmap_remove(server->leases_by_client_id, existing_lease); | |
941 | dhcp_lease_free(existing_lease); | |
942 | ||
943 | return 1; | |
944 | } else | |
945 | return 0; | |
946 | } | |
2dead812 | 947 | } |
4dc35568 TG |
948 | |
949 | return 0; | |
be077570 TG |
950 | } |
951 | ||
ff734080 TG |
952 | static int server_receive_message(sd_event_source *s, int fd, |
953 | uint32_t revents, void *userdata) { | |
be077570 | 954 | _cleanup_free_ DHCPMessage *message = NULL; |
3a864fe4 | 955 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))]; |
ff734080 TG |
956 | sd_dhcp_server *server = userdata; |
957 | struct iovec iov = {}; | |
958 | struct msghdr msg = { | |
959 | .msg_iov = &iov, | |
960 | .msg_iovlen = 1, | |
3a864fe4 TG |
961 | .msg_control = cmsgbuf, |
962 | .msg_controllen = sizeof(cmsgbuf), | |
ff734080 | 963 | }; |
3a864fe4 | 964 | struct cmsghdr *cmsg; |
4edc2c9b | 965 | ssize_t buflen, len; |
ff734080 TG |
966 | |
967 | assert(server); | |
968 | ||
4edc2c9b LP |
969 | buflen = next_datagram_size_fd(fd); |
970 | if (buflen < 0) | |
971 | return buflen; | |
ff734080 | 972 | |
0d43d2fc | 973 | message = malloc(buflen); |
ff734080 TG |
974 | if (!message) |
975 | return -ENOMEM; | |
976 | ||
977 | iov.iov_base = message; | |
978 | iov.iov_len = buflen; | |
979 | ||
a38d9945 | 980 | len = recvmsg(fd, &msg, 0); |
0d43d2fc TG |
981 | if (len < 0) { |
982 | if (errno == EAGAIN || errno == EINTR) | |
983 | return 0; | |
984 | ||
985 | return -errno; | |
986 | } else if ((size_t)len < sizeof(DHCPMessage)) | |
be077570 | 987 | return 0; |
ff734080 | 988 | |
2a1288ff | 989 | CMSG_FOREACH(cmsg, &msg) { |
3a864fe4 TG |
990 | if (cmsg->cmsg_level == IPPROTO_IP && |
991 | cmsg->cmsg_type == IP_PKTINFO && | |
992 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) { | |
993 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg); | |
994 | ||
a6f1e036 TG |
995 | /* TODO figure out if this can be done as a filter on |
996 | * the socket, like for IPv6 */ | |
b3ec603c | 997 | if (server->ifindex != info->ipi_ifindex) |
3a864fe4 TG |
998 | return 0; |
999 | ||
1000 | break; | |
1001 | } | |
1002 | } | |
1003 | ||
be077570 | 1004 | return dhcp_server_handle_message(server, message, (size_t)len); |
ff734080 TG |
1005 | } |
1006 | ||
1007 | int sd_dhcp_server_start(sd_dhcp_server *server) { | |
1008 | int r; | |
1009 | ||
1010 | assert_return(server, -EINVAL); | |
1011 | assert_return(server->event, -EINVAL); | |
1012 | assert_return(!server->receive_message, -EBUSY); | |
8de4a226 | 1013 | assert_return(server->fd_raw == -1, -EBUSY); |
ff734080 | 1014 | assert_return(server->fd == -1, -EBUSY); |
20af7091 | 1015 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH); |
ff734080 | 1016 | |
8de4a226 TG |
1017 | r = socket(AF_PACKET, SOCK_DGRAM | SOCK_NONBLOCK, 0); |
1018 | if (r < 0) { | |
1019 | r = -errno; | |
1020 | sd_dhcp_server_stop(server); | |
1021 | return r; | |
1022 | } | |
1023 | server->fd_raw = r; | |
1024 | ||
ff734080 TG |
1025 | r = dhcp_network_bind_udp_socket(INADDR_ANY, DHCP_PORT_SERVER); |
1026 | if (r < 0) { | |
1027 | sd_dhcp_server_stop(server); | |
1028 | return r; | |
1029 | } | |
1030 | server->fd = r; | |
1031 | ||
1032 | r = sd_event_add_io(server->event, &server->receive_message, | |
1033 | server->fd, EPOLLIN, | |
1034 | server_receive_message, server); | |
1035 | if (r < 0) { | |
1036 | sd_dhcp_server_stop(server); | |
1037 | return r; | |
1038 | } | |
1039 | ||
1040 | r = sd_event_source_set_priority(server->receive_message, | |
1041 | server->event_priority); | |
1042 | if (r < 0) { | |
1043 | sd_dhcp_server_stop(server); | |
1044 | return r; | |
1045 | } | |
1046 | ||
1047 | log_dhcp_server(server, "STARTED"); | |
1048 | ||
1049 | return 0; | |
1050 | } | |
52750344 TG |
1051 | |
1052 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { | |
1053 | unsigned i; | |
621ac3d2 | 1054 | int r = 0; |
52750344 TG |
1055 | |
1056 | assert_return(server, -EINVAL); | |
1057 | assert(server->bound_leases); | |
1058 | ||
1059 | for (i = 0; i < server->pool_size; i++) { | |
1060 | DHCPLease *lease = server->bound_leases[i]; | |
1061 | ||
99634696 | 1062 | if (!lease || lease == &server->invalid_lease) |
52750344 TG |
1063 | continue; |
1064 | ||
1065 | r = server_send_forcerenew(server, lease->address, | |
1066 | lease->gateway, | |
1067 | lease->chaddr); | |
1068 | if (r < 0) | |
1069 | return r; | |
1070 | else | |
1071 | log_dhcp_server(server, "FORCERENEW"); | |
1072 | } | |
1073 | ||
1074 | return r; | |
1075 | } | |
8eb9058d | 1076 | |
64d6c229 | 1077 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { |
8eb9058d LP |
1078 | int r; |
1079 | ||
1080 | assert_return(server, -EINVAL); | |
64d6c229 | 1081 | assert_return(timezone_is_valid(tz), -EINVAL); |
8eb9058d | 1082 | |
64d6c229 | 1083 | if (streq_ptr(tz, server->timezone)) |
8eb9058d LP |
1084 | return 0; |
1085 | ||
64d6c229 | 1086 | r = free_and_strdup(&server->timezone, tz); |
8eb9058d LP |
1087 | if (r < 0) |
1088 | return r; | |
1089 | ||
1090 | return 1; | |
1091 | } | |
586ac6f7 LP |
1092 | |
1093 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1094 | assert_return(server, -EINVAL); | |
1095 | ||
1096 | if (t == server->max_lease_time) | |
1097 | return 0; | |
1098 | ||
1099 | server->max_lease_time = t; | |
1100 | return 1; | |
1101 | } | |
1102 | ||
1103 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1104 | assert_return(server, -EINVAL); | |
1105 | ||
1106 | if (t == server->default_lease_time) | |
1107 | return 0; | |
1108 | ||
1109 | server->default_lease_time = t; | |
1110 | return 1; | |
1111 | } | |
1a04db0f LP |
1112 | |
1113 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], unsigned n) { | |
1114 | assert_return(server, -EINVAL); | |
1115 | assert_return(dns || n <= 0, -EINVAL); | |
1116 | ||
1117 | if (server->n_dns == n && | |
1118 | memcmp(server->dns, dns, sizeof(struct in_addr) * n) == 0) | |
1119 | return 0; | |
1120 | ||
1121 | if (n <= 0) { | |
1122 | server->dns = mfree(server->dns); | |
1123 | server->n_dns = 0; | |
1124 | } else { | |
1125 | struct in_addr *c; | |
1126 | ||
1127 | c = newdup(struct in_addr, dns, n); | |
1128 | if (!c) | |
1129 | return -ENOMEM; | |
1130 | ||
1131 | free(server->dns); | |
1132 | server->dns = c; | |
1133 | server->n_dns = n; | |
1134 | } | |
1135 | ||
1136 | return 1; | |
1137 | } | |
1138 | ||
1139 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], unsigned n) { | |
1140 | assert_return(server, -EINVAL); | |
1141 | assert_return(ntp || n <= 0, -EINVAL); | |
1142 | ||
1143 | if (server->n_ntp == n && | |
1144 | memcmp(server->ntp, ntp, sizeof(struct in_addr) * n) == 0) | |
1145 | return 0; | |
1146 | ||
1147 | if (n <= 0) { | |
1148 | server->ntp = mfree(server->ntp); | |
1149 | server->n_ntp = 0; | |
1150 | } else { | |
1151 | struct in_addr *c; | |
1152 | ||
1153 | c = newdup(struct in_addr, ntp, n); | |
1154 | if (!c) | |
1155 | return -ENOMEM; | |
1156 | ||
1157 | free(server->ntp); | |
1158 | server->ntp = c; | |
1159 | server->n_ntp = n; | |
1160 | } | |
1161 | ||
1162 | return 1; | |
1163 | } | |
77ff6022 CG |
1164 | |
1165 | int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled) { | |
1166 | assert_return(server, -EINVAL); | |
1167 | ||
1168 | if (enabled == server->emit_router) | |
1169 | return 0; | |
1170 | ||
1171 | server->emit_router = enabled; | |
1172 | ||
1173 | return 1; | |
1174 | } |