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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 | ||
32d20645 | 211 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int64_t priority) { |
b44cd882 TG |
212 | int r; |
213 | ||
214 | assert_return(server, -EINVAL); | |
215 | assert_return(!server->event, -EBUSY); | |
216 | ||
217 | if (event) | |
218 | server->event = sd_event_ref(event); | |
219 | else { | |
220 | r = sd_event_default(&server->event); | |
221 | if (r < 0) | |
222 | return r; | |
223 | } | |
224 | ||
225 | server->event_priority = priority; | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
231 | assert_return(server, -EINVAL); | |
232 | ||
233 | server->event = sd_event_unref(server->event); | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
238 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
239 | assert_return(server, NULL); | |
240 | ||
241 | return server->event; | |
242 | } | |
ff734080 TG |
243 | |
244 | int sd_dhcp_server_stop(sd_dhcp_server *server) { | |
245 | assert_return(server, -EINVAL); | |
246 | ||
247 | server->receive_message = | |
248 | sd_event_source_unref(server->receive_message); | |
249 | ||
8de4a226 | 250 | server->fd_raw = safe_close(server->fd_raw); |
ff734080 TG |
251 | server->fd = safe_close(server->fd); |
252 | ||
253 | log_dhcp_server(server, "STOPPED"); | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
a6f1e036 TG |
258 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
259 | DHCPPacket *packet, size_t len) { | |
969b009d TG |
260 | union sockaddr_union link = { |
261 | .ll.sll_family = AF_PACKET, | |
262 | .ll.sll_protocol = htons(ETH_P_IP), | |
b3ec603c | 263 | .ll.sll_ifindex = server->ifindex, |
969b009d TG |
264 | .ll.sll_halen = ETH_ALEN, |
265 | }; | |
969b009d TG |
266 | |
267 | assert(server); | |
b3ec603c | 268 | assert(server->ifindex > 0); |
969b009d TG |
269 | assert(server->address); |
270 | assert(packet); | |
271 | assert(len > sizeof(DHCPPacket)); | |
272 | ||
273 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN); | |
274 | ||
275 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, | |
a6f1e036 TG |
276 | packet->dhcp.yiaddr, |
277 | DHCP_PORT_CLIENT, len); | |
969b009d | 278 | |
b3ec603c | 279 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
969b009d TG |
280 | } |
281 | ||
282 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
8eb7b6a5 | 283 | uint16_t destination_port, |
969b009d TG |
284 | DHCPMessage *message, size_t len) { |
285 | union sockaddr_union dest = { | |
286 | .in.sin_family = AF_INET, | |
8eb7b6a5 | 287 | .in.sin_port = htobe16(destination_port), |
969b009d TG |
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; | |
8eb7b6a5 | 346 | uint16_t destination_port = DHCP_PORT_CLIENT; |
969b009d TG |
347 | int r; |
348 | ||
349 | assert(server); | |
350 | assert(req); | |
351 | assert(req->max_optlen); | |
352 | assert(optoffset <= req->max_optlen); | |
353 | assert(packet); | |
354 | ||
355 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 356 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
969b009d TG |
357 | 4, &server->address); |
358 | if (r < 0) | |
359 | return r; | |
360 | ||
361 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 362 | SD_DHCP_OPTION_END, 0, NULL); |
969b009d TG |
363 | if (r < 0) |
364 | return r; | |
365 | ||
366 | /* RFC 2131 Section 4.1 | |
367 | ||
368 | If the ’giaddr’ field in a DHCP message from a client is non-zero, | |
369 | the server sends any return messages to the ’DHCP server’ port on the | |
370 | BOOTP relay agent whose address appears in ’giaddr’. If the ’giaddr’ | |
371 | field is zero and the ’ciaddr’ field is nonzero, then the server | |
372 | unicasts DHCPOFFER and DHCPACK messages to the address in ’ciaddr’. | |
373 | If ’giaddr’ is zero and ’ciaddr’ is zero, and the broadcast bit is | |
374 | set, then the server broadcasts DHCPOFFER and DHCPACK messages to | |
375 | 0xffffffff. If the broadcast bit is not set and ’giaddr’ is zero and | |
376 | ’ciaddr’ is zero, then the server unicasts DHCPOFFER and DHCPACK | |
377 | messages to the client’s hardware address and ’yiaddr’ address. In | |
378 | all cases, when ’giaddr’ is zero, the server broadcasts any DHCPNAK | |
379 | messages to 0xffffffff. | |
380 | ||
381 | Section 4.3.2 | |
382 | ||
383 | If ’giaddr’ is set in the DHCPREQUEST message, the client is on a | |
384 | different subnet. The server MUST set the broadcast bit in the | |
385 | DHCPNAK, so that the relay agent will broadcast the DHCPNAK to the | |
386 | client, because the client may not have a correct network address | |
387 | or subnet mask, and the client may not be answering ARP requests. | |
388 | */ | |
389 | if (req->message->giaddr) { | |
390 | destination = req->message->giaddr; | |
8eb7b6a5 | 391 | destination_port = DHCP_PORT_SERVER; |
969b009d TG |
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) |
8eb7b6a5 PF |
398 | return dhcp_server_send_udp(server, destination, |
399 | destination_port, &packet->dhcp, | |
969b009d | 400 | sizeof(DHCPMessage) + optoffset); |
d6bd972d | 401 | else if (requested_broadcast(req) || type == DHCP_NAK) |
a6f1e036 | 402 | return dhcp_server_send_udp(server, INADDR_BROADCAST, |
8eb7b6a5 | 403 | destination_port, &packet->dhcp, |
d6bd972d | 404 | sizeof(DHCPMessage) + optoffset); |
969b009d | 405 | else |
a6f1e036 TG |
406 | /* we cannot send UDP packet to specific MAC address when the |
407 | address is not yet configured, so must fall back to raw | |
408 | packets */ | |
969b009d TG |
409 | return dhcp_server_send_unicast_raw(server, packet, |
410 | sizeof(DHCPPacket) + optoffset); | |
411 | } | |
412 | ||
4dc35568 | 413 | static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret, |
a6f1e036 TG |
414 | uint8_t type, size_t *_optoffset, |
415 | DHCPRequest *req) { | |
4dc35568 | 416 | _cleanup_free_ DHCPPacket *packet = NULL; |
1231c4d2 | 417 | size_t optoffset = 0; |
4dc35568 TG |
418 | int r; |
419 | ||
420 | assert(server); | |
421 | assert(ret); | |
422 | assert(_optoffset); | |
bd57b450 | 423 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)); |
4dc35568 TG |
424 | |
425 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen); | |
426 | if (!packet) | |
427 | return -ENOMEM; | |
428 | ||
a6f1e036 | 429 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
76253e73 DW |
430 | be32toh(req->message->xid), type, ARPHRD_ETHER, |
431 | req->max_optlen, &optoffset); | |
4dc35568 TG |
432 | if (r < 0) |
433 | return r; | |
434 | ||
435 | packet->dhcp.flags = req->message->flags; | |
436 | packet->dhcp.giaddr = req->message->giaddr; | |
437 | memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN); | |
438 | ||
439 | *_optoffset = optoffset; | |
440 | *ret = packet; | |
441 | packet = NULL; | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
a6f1e036 TG |
446 | static int server_send_offer(sd_dhcp_server *server, DHCPRequest *req, |
447 | be32_t address) { | |
4dc35568 TG |
448 | _cleanup_free_ DHCPPacket *packet = NULL; |
449 | size_t offset; | |
450 | be32_t lease_time; | |
451 | int r; | |
452 | ||
453 | r = server_message_init(server, &packet, DHCP_OFFER, &offset, req); | |
454 | if (r < 0) | |
455 | return r; | |
456 | ||
2dead812 | 457 | packet->dhcp.yiaddr = address; |
4dc35568 | 458 | |
c7d9ffe6 | 459 | lease_time = htobe32(req->lifetime); |
4dc35568 | 460 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 461 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 462 | &lease_time); |
4dc35568 TG |
463 | if (r < 0) |
464 | return r; | |
465 | ||
59b8f6b6 | 466 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 467 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
468 | if (r < 0) |
469 | return r; | |
470 | ||
77ff6022 CG |
471 | if (server->emit_router) { |
472 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
473 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
474 | if (r < 0) | |
475 | return r; | |
476 | } | |
59b8f6b6 | 477 | |
4dc35568 TG |
478 | r = dhcp_server_send_packet(server, req, packet, DHCP_OFFER, offset); |
479 | if (r < 0) | |
480 | return r; | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
a6f1e036 TG |
485 | static int server_send_ack(sd_dhcp_server *server, DHCPRequest *req, |
486 | be32_t address) { | |
2dead812 TG |
487 | _cleanup_free_ DHCPPacket *packet = NULL; |
488 | size_t offset; | |
489 | be32_t lease_time; | |
490 | int r; | |
491 | ||
492 | r = server_message_init(server, &packet, DHCP_ACK, &offset, req); | |
493 | if (r < 0) | |
494 | return r; | |
495 | ||
496 | packet->dhcp.yiaddr = address; | |
497 | ||
c7d9ffe6 | 498 | lease_time = htobe32(req->lifetime); |
2dead812 | 499 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 500 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 501 | &lease_time); |
2dead812 TG |
502 | if (r < 0) |
503 | return r; | |
504 | ||
59b8f6b6 | 505 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 506 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
507 | if (r < 0) |
508 | return r; | |
509 | ||
77ff6022 CG |
510 | if (server->emit_router) { |
511 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
512 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
513 | if (r < 0) | |
514 | return r; | |
515 | } | |
59b8f6b6 | 516 | |
1a04db0f LP |
517 | if (server->n_dns > 0) { |
518 | r = dhcp_option_append( | |
519 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 520 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, |
1a04db0f LP |
521 | sizeof(struct in_addr) * server->n_dns, server->dns); |
522 | if (r < 0) | |
523 | return r; | |
524 | } | |
525 | ||
526 | if (server->n_ntp > 0) { | |
527 | r = dhcp_option_append( | |
528 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 529 | SD_DHCP_OPTION_NTP_SERVER, |
1a04db0f LP |
530 | sizeof(struct in_addr) * server->n_ntp, server->ntp); |
531 | if (r < 0) | |
532 | return r; | |
533 | } | |
534 | ||
8eb9058d LP |
535 | if (server->timezone) { |
536 | r = dhcp_option_append( | |
537 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 538 | SD_DHCP_OPTION_NEW_TZDB_TIMEZONE, |
8eb9058d LP |
539 | strlen(server->timezone), server->timezone); |
540 | if (r < 0) | |
541 | return r; | |
542 | } | |
543 | ||
2dead812 TG |
544 | r = dhcp_server_send_packet(server, req, packet, DHCP_ACK, offset); |
545 | if (r < 0) | |
546 | return r; | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
bd57b450 TG |
551 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { |
552 | _cleanup_free_ DHCPPacket *packet = NULL; | |
553 | size_t offset; | |
554 | int r; | |
555 | ||
556 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); | |
557 | if (r < 0) | |
558 | return r; | |
559 | ||
b3ec603c | 560 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
bd57b450 TG |
561 | } |
562 | ||
a6f1e036 TG |
563 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
564 | be32_t gateway, uint8_t chaddr[]) { | |
52750344 TG |
565 | _cleanup_free_ DHCPPacket *packet = NULL; |
566 | size_t optoffset = 0; | |
567 | int r; | |
568 | ||
569 | assert(server); | |
570 | assert(address != INADDR_ANY); | |
571 | assert(chaddr); | |
572 | ||
573 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
574 | if (!packet) | |
575 | return -ENOMEM; | |
576 | ||
577 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
76253e73 DW |
578 | DHCP_FORCERENEW, ARPHRD_ETHER, |
579 | DHCP_MIN_OPTIONS_SIZE, &optoffset); | |
52750344 TG |
580 | if (r < 0) |
581 | return r; | |
582 | ||
583 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
22805d92 | 584 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL); |
52750344 TG |
585 | if (r < 0) |
586 | return r; | |
587 | ||
588 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); | |
589 | ||
8eb7b6a5 PF |
590 | r = dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, |
591 | &packet->dhcp, | |
52750344 | 592 | sizeof(DHCPMessage) + optoffset); |
c15fb62a TA |
593 | if (r < 0) |
594 | return r; | |
52750344 TG |
595 | |
596 | return 0; | |
597 | } | |
598 | ||
b3ec603c | 599 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
89ca10c6 | 600 | DHCPRequest *req = userdata; |
816e2e7a TG |
601 | |
602 | assert(req); | |
603 | ||
604 | switch(code) { | |
22805d92 | 605 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
c7d9ffe6 TG |
606 | if (len == 4) |
607 | req->lifetime = be32toh(*(be32_t*)option); | |
608 | ||
609 | break; | |
22805d92 | 610 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
2dead812 TG |
611 | if (len == 4) |
612 | req->requested_ip = *(be32_t*)option; | |
613 | ||
614 | break; | |
22805d92 | 615 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
816e2e7a TG |
616 | if (len == 4) |
617 | req->server_id = *(be32_t*)option; | |
618 | ||
619 | break; | |
22805d92 | 620 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
816e2e7a TG |
621 | if (len >= 2) { |
622 | uint8_t *data; | |
623 | ||
624 | data = memdup(option, len); | |
625 | if (!data) | |
626 | return -ENOMEM; | |
627 | ||
628 | free(req->client_id.data); | |
629 | req->client_id.data = data; | |
630 | req->client_id.length = len; | |
631 | } | |
632 | ||
633 | break; | |
22805d92 | 634 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
816e2e7a TG |
635 | if (len == 2) |
636 | req->max_optlen = be16toh(*(be16_t*)option) - | |
637 | - sizeof(DHCPPacket); | |
638 | ||
639 | break; | |
640 | } | |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
645 | static void dhcp_request_free(DHCPRequest *req) { | |
646 | if (!req) | |
647 | return; | |
648 | ||
649 | free(req->client_id.data); | |
650 | free(req); | |
651 | } | |
652 | ||
653 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
654 | #define _cleanup_dhcp_request_free_ _cleanup_(dhcp_request_freep) | |
655 | ||
586ac6f7 | 656 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
816e2e7a TG |
657 | assert(req); |
658 | assert(message); | |
659 | ||
660 | req->message = message; | |
661 | ||
e2acdb6b | 662 | /* set client id based on MAC address if client did not send an explicit |
a6f1e036 | 663 | one */ |
816e2e7a | 664 | if (!req->client_id.data) { |
9a0f246f | 665 | void *data; |
816e2e7a | 666 | |
9a0f246f | 667 | data = malloc0(ETH_ALEN + 1); |
816e2e7a TG |
668 | if (!data) |
669 | return -ENOMEM; | |
670 | ||
9a0f246f LP |
671 | ((uint8_t*) data)[0] = 0x01; |
672 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN); | |
673 | ||
816e2e7a TG |
674 | req->client_id.length = ETH_ALEN + 1; |
675 | req->client_id.data = data; | |
816e2e7a TG |
676 | } |
677 | ||
678 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) | |
679 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
680 | ||
9a0f246f | 681 | if (req->lifetime <= 0) |
586ac6f7 LP |
682 | req->lifetime = MAX(1ULL, server->default_lease_time); |
683 | ||
684 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
685 | req->lifetime = server->max_lease_time; | |
c7d9ffe6 | 686 | |
816e2e7a TG |
687 | return 0; |
688 | } | |
689 | ||
87322b3a TG |
690 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { |
691 | assert(server); | |
692 | ||
693 | if (!server->pool_size) | |
694 | return -EINVAL; | |
695 | ||
99634696 TG |
696 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
697 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
698 | return -ERANGE; | |
87322b3a | 699 | |
99634696 | 700 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
87322b3a TG |
701 | } |
702 | ||
83cedf7a TG |
703 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
704 | ||
be077570 TG |
705 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, |
706 | size_t length) { | |
816e2e7a | 707 | _cleanup_dhcp_request_free_ DHCPRequest *req = NULL; |
f693e9b3 | 708 | _cleanup_free_ char *error_message = NULL; |
87322b3a | 709 | DHCPLease *existing_lease; |
816e2e7a | 710 | int type, r; |
be077570 TG |
711 | |
712 | assert(server); | |
713 | assert(message); | |
714 | ||
715 | if (message->op != BOOTREQUEST || | |
716 | message->htype != ARPHRD_ETHER || | |
717 | message->hlen != ETHER_ADDR_LEN) | |
718 | return 0; | |
719 | ||
816e2e7a TG |
720 | req = new0(DHCPRequest, 1); |
721 | if (!req) | |
722 | return -ENOMEM; | |
723 | ||
f693e9b3 | 724 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
be077570 TG |
725 | if (type < 0) |
726 | return 0; | |
727 | ||
586ac6f7 | 728 | r = ensure_sane_request(server, req, message); |
816e2e7a TG |
729 | if (r < 0) |
730 | /* this only fails on critical errors */ | |
731 | return r; | |
732 | ||
a6f1e036 TG |
733 | existing_lease = hashmap_get(server->leases_by_client_id, |
734 | &req->client_id); | |
87322b3a | 735 | |
4dc35568 | 736 | switch(type) { |
9a0f246f LP |
737 | |
738 | case DHCP_DISCOVER: { | |
87322b3a TG |
739 | be32_t address = INADDR_ANY; |
740 | unsigned i; | |
2dead812 | 741 | |
4dc35568 TG |
742 | log_dhcp_server(server, "DISCOVER (0x%x)", |
743 | be32toh(req->message->xid)); | |
744 | ||
2dead812 TG |
745 | if (!server->pool_size) |
746 | /* no pool allocated */ | |
747 | return 0; | |
748 | ||
87322b3a TG |
749 | /* for now pick a random free address from the pool */ |
750 | if (existing_lease) | |
751 | address = existing_lease->address; | |
752 | else { | |
b826ab58 | 753 | struct siphash state; |
0cb3c286 | 754 | uint64_t hash; |
99634696 | 755 | uint32_t next_offer; |
83cedf7a TG |
756 | |
757 | /* even with no persistence of leases, we try to offer the same client | |
758 | the same IP address. we do this by using the hash of the client id | |
759 | as the offset into the pool of leases when finding the next free one */ | |
760 | ||
0cb3c286 | 761 | siphash24_init(&state, HASH_KEY.bytes); |
b826ab58 | 762 | client_id_hash_func(&req->client_id, &state); |
933f9cae | 763 | hash = htole64(siphash24_finalize(&state)); |
0cb3c286 | 764 | next_offer = hash % server->pool_size; |
83cedf7a | 765 | |
87322b3a | 766 | for (i = 0; i < server->pool_size; i++) { |
83cedf7a | 767 | if (!server->bound_leases[next_offer]) { |
99634696 | 768 | address = server->subnet | htobe32(server->pool_offset + next_offer); |
87322b3a TG |
769 | break; |
770 | } else | |
83cedf7a | 771 | next_offer = (next_offer + 1) % server->pool_size; |
87322b3a TG |
772 | } |
773 | } | |
774 | ||
775 | if (address == INADDR_ANY) | |
776 | /* no free addresses left */ | |
777 | return 0; | |
2dead812 TG |
778 | |
779 | r = server_send_offer(server, req, address); | |
4dc35568 TG |
780 | if (r < 0) { |
781 | /* this only fails on critical errors */ | |
782 | log_dhcp_server(server, "could not send offer: %s", | |
783 | strerror(-r)); | |
784 | return r; | |
785 | } else { | |
786 | log_dhcp_server(server, "OFFER (0x%x)", | |
787 | be32toh(req->message->xid)); | |
788 | return DHCP_OFFER; | |
789 | } | |
be077570 | 790 | |
4dc35568 TG |
791 | break; |
792 | } | |
5b34277c | 793 | case DHCP_DECLINE: |
f693e9b3 | 794 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message)); |
5b34277c TG |
795 | |
796 | /* TODO: make sure we don't offer this address again */ | |
797 | ||
798 | return 1; | |
799 | ||
9a0f246f | 800 | case DHCP_REQUEST: { |
2dead812 | 801 | be32_t address; |
bd57b450 | 802 | bool init_reboot = false; |
87322b3a | 803 | int pool_offset; |
2dead812 TG |
804 | |
805 | /* see RFC 2131, section 4.3.2 */ | |
806 | ||
807 | if (req->server_id) { | |
808 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", | |
809 | be32toh(req->message->xid)); | |
810 | ||
811 | /* SELECTING */ | |
812 | if (req->server_id != server->address) | |
813 | /* client did not pick us */ | |
814 | return 0; | |
815 | ||
816 | if (req->message->ciaddr) | |
817 | /* this MUST be zero */ | |
818 | return 0; | |
819 | ||
820 | if (!req->requested_ip) | |
821 | /* this must be filled in with the yiaddr | |
822 | from the chosen OFFER */ | |
823 | return 0; | |
824 | ||
825 | address = req->requested_ip; | |
826 | } else if (req->requested_ip) { | |
827 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", | |
828 | be32toh(req->message->xid)); | |
829 | ||
830 | /* INIT-REBOOT */ | |
831 | if (req->message->ciaddr) | |
832 | /* this MUST be zero */ | |
833 | return 0; | |
834 | ||
bd57b450 | 835 | /* TODO: check more carefully if IP is correct */ |
2dead812 | 836 | address = req->requested_ip; |
bd57b450 | 837 | init_reboot = true; |
2dead812 TG |
838 | } else { |
839 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
840 | be32toh(req->message->xid)); | |
841 | ||
842 | /* REBINDING / RENEWING */ | |
843 | if (!req->message->ciaddr) | |
844 | /* this MUST be filled in with clients IP address */ | |
845 | return 0; | |
846 | ||
847 | address = req->message->ciaddr; | |
848 | } | |
849 | ||
87322b3a TG |
850 | pool_offset = get_pool_offset(server, address); |
851 | ||
852 | /* verify that the requested address is from the pool, and either | |
853 | owned by the current client or free */ | |
854 | if (pool_offset >= 0 && | |
855 | server->bound_leases[pool_offset] == existing_lease) { | |
856 | DHCPLease *lease; | |
a7f7d1bd | 857 | usec_t time_now = 0; |
87322b3a TG |
858 | |
859 | if (!existing_lease) { | |
860 | lease = new0(DHCPLease, 1); | |
861 | lease->address = req->requested_ip; | |
862 | lease->client_id.data = memdup(req->client_id.data, | |
863 | req->client_id.length); | |
02557f97 TA |
864 | if (!lease->client_id.data) { |
865 | free(lease); | |
87322b3a | 866 | return -ENOMEM; |
02557f97 | 867 | } |
87322b3a | 868 | lease->client_id.length = req->client_id.length; |
a6f1e036 TG |
869 | memcpy(&lease->chaddr, &req->message->chaddr, |
870 | ETH_ALEN); | |
52750344 | 871 | lease->gateway = req->message->giaddr; |
87322b3a TG |
872 | } else |
873 | lease = existing_lease; | |
874 | ||
a6f1e036 TG |
875 | r = sd_event_now(server->event, |
876 | clock_boottime_or_monotonic(), | |
877 | &time_now); | |
bff92d2c SS |
878 | if (r < 0) { |
879 | if (!existing_lease) | |
880 | dhcp_lease_free(lease); | |
38a03f06 | 881 | return r; |
bff92d2c SS |
882 | } |
883 | ||
87322b3a TG |
884 | lease->expiration = req->lifetime * USEC_PER_SEC + time_now; |
885 | ||
2dead812 TG |
886 | r = server_send_ack(server, req, address); |
887 | if (r < 0) { | |
888 | /* this only fails on critical errors */ | |
889 | log_dhcp_server(server, "could not send ack: %s", | |
890 | strerror(-r)); | |
87322b3a TG |
891 | |
892 | if (!existing_lease) | |
893 | dhcp_lease_free(lease); | |
894 | ||
2dead812 TG |
895 | return r; |
896 | } else { | |
897 | log_dhcp_server(server, "ACK (0x%x)", | |
898 | be32toh(req->message->xid)); | |
87322b3a TG |
899 | |
900 | server->bound_leases[pool_offset] = lease; | |
a6f1e036 TG |
901 | hashmap_put(server->leases_by_client_id, |
902 | &lease->client_id, lease); | |
87322b3a | 903 | |
2dead812 TG |
904 | return DHCP_ACK; |
905 | } | |
bd57b450 TG |
906 | } else if (init_reboot) { |
907 | r = server_send_nak(server, req); | |
908 | if (r < 0) { | |
909 | /* this only fails on critical errors */ | |
910 | log_dhcp_server(server, "could not send nak: %s", | |
911 | strerror(-r)); | |
912 | return r; | |
913 | } else { | |
914 | log_dhcp_server(server, "NAK (0x%x)", | |
915 | be32toh(req->message->xid)); | |
916 | return DHCP_NAK; | |
917 | } | |
918 | } | |
2dead812 TG |
919 | |
920 | break; | |
921 | } | |
9a0f246f | 922 | |
500792d8 TG |
923 | case DHCP_RELEASE: { |
924 | int pool_offset; | |
925 | ||
926 | log_dhcp_server(server, "RELEASE (0x%x)", | |
927 | be32toh(req->message->xid)); | |
928 | ||
929 | if (!existing_lease) | |
930 | return 0; | |
931 | ||
932 | if (existing_lease->address != req->message->ciaddr) | |
933 | return 0; | |
934 | ||
935 | pool_offset = get_pool_offset(server, req->message->ciaddr); | |
936 | if (pool_offset < 0) | |
937 | return 0; | |
938 | ||
939 | if (server->bound_leases[pool_offset] == existing_lease) { | |
940 | server->bound_leases[pool_offset] = NULL; | |
941 | hashmap_remove(server->leases_by_client_id, existing_lease); | |
942 | dhcp_lease_free(existing_lease); | |
943 | ||
944 | return 1; | |
945 | } else | |
946 | return 0; | |
947 | } | |
2dead812 | 948 | } |
4dc35568 TG |
949 | |
950 | return 0; | |
be077570 TG |
951 | } |
952 | ||
ff734080 TG |
953 | static int server_receive_message(sd_event_source *s, int fd, |
954 | uint32_t revents, void *userdata) { | |
be077570 | 955 | _cleanup_free_ DHCPMessage *message = NULL; |
3a864fe4 | 956 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))]; |
ff734080 TG |
957 | sd_dhcp_server *server = userdata; |
958 | struct iovec iov = {}; | |
959 | struct msghdr msg = { | |
960 | .msg_iov = &iov, | |
961 | .msg_iovlen = 1, | |
3a864fe4 TG |
962 | .msg_control = cmsgbuf, |
963 | .msg_controllen = sizeof(cmsgbuf), | |
ff734080 | 964 | }; |
3a864fe4 | 965 | struct cmsghdr *cmsg; |
4edc2c9b | 966 | ssize_t buflen, len; |
ff734080 TG |
967 | |
968 | assert(server); | |
969 | ||
4edc2c9b LP |
970 | buflen = next_datagram_size_fd(fd); |
971 | if (buflen < 0) | |
972 | return buflen; | |
ff734080 | 973 | |
0d43d2fc | 974 | message = malloc(buflen); |
ff734080 TG |
975 | if (!message) |
976 | return -ENOMEM; | |
977 | ||
978 | iov.iov_base = message; | |
979 | iov.iov_len = buflen; | |
980 | ||
a38d9945 | 981 | len = recvmsg(fd, &msg, 0); |
0d43d2fc TG |
982 | if (len < 0) { |
983 | if (errno == EAGAIN || errno == EINTR) | |
984 | return 0; | |
985 | ||
986 | return -errno; | |
987 | } else if ((size_t)len < sizeof(DHCPMessage)) | |
be077570 | 988 | return 0; |
ff734080 | 989 | |
2a1288ff | 990 | CMSG_FOREACH(cmsg, &msg) { |
3a864fe4 TG |
991 | if (cmsg->cmsg_level == IPPROTO_IP && |
992 | cmsg->cmsg_type == IP_PKTINFO && | |
993 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) { | |
994 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg); | |
995 | ||
a6f1e036 TG |
996 | /* TODO figure out if this can be done as a filter on |
997 | * the socket, like for IPv6 */ | |
b3ec603c | 998 | if (server->ifindex != info->ipi_ifindex) |
3a864fe4 TG |
999 | return 0; |
1000 | ||
1001 | break; | |
1002 | } | |
1003 | } | |
1004 | ||
be077570 | 1005 | return dhcp_server_handle_message(server, message, (size_t)len); |
ff734080 TG |
1006 | } |
1007 | ||
1008 | int sd_dhcp_server_start(sd_dhcp_server *server) { | |
1009 | int r; | |
1010 | ||
1011 | assert_return(server, -EINVAL); | |
1012 | assert_return(server->event, -EINVAL); | |
1013 | assert_return(!server->receive_message, -EBUSY); | |
8de4a226 | 1014 | assert_return(server->fd_raw == -1, -EBUSY); |
ff734080 | 1015 | assert_return(server->fd == -1, -EBUSY); |
20af7091 | 1016 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH); |
ff734080 | 1017 | |
8de4a226 TG |
1018 | r = socket(AF_PACKET, SOCK_DGRAM | SOCK_NONBLOCK, 0); |
1019 | if (r < 0) { | |
1020 | r = -errno; | |
1021 | sd_dhcp_server_stop(server); | |
1022 | return r; | |
1023 | } | |
1024 | server->fd_raw = r; | |
1025 | ||
ff734080 TG |
1026 | r = dhcp_network_bind_udp_socket(INADDR_ANY, DHCP_PORT_SERVER); |
1027 | if (r < 0) { | |
1028 | sd_dhcp_server_stop(server); | |
1029 | return r; | |
1030 | } | |
1031 | server->fd = r; | |
1032 | ||
1033 | r = sd_event_add_io(server->event, &server->receive_message, | |
1034 | server->fd, EPOLLIN, | |
1035 | server_receive_message, server); | |
1036 | if (r < 0) { | |
1037 | sd_dhcp_server_stop(server); | |
1038 | return r; | |
1039 | } | |
1040 | ||
1041 | r = sd_event_source_set_priority(server->receive_message, | |
1042 | server->event_priority); | |
1043 | if (r < 0) { | |
1044 | sd_dhcp_server_stop(server); | |
1045 | return r; | |
1046 | } | |
1047 | ||
1048 | log_dhcp_server(server, "STARTED"); | |
1049 | ||
1050 | return 0; | |
1051 | } | |
52750344 TG |
1052 | |
1053 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { | |
1054 | unsigned i; | |
621ac3d2 | 1055 | int r = 0; |
52750344 TG |
1056 | |
1057 | assert_return(server, -EINVAL); | |
1058 | assert(server->bound_leases); | |
1059 | ||
1060 | for (i = 0; i < server->pool_size; i++) { | |
1061 | DHCPLease *lease = server->bound_leases[i]; | |
1062 | ||
99634696 | 1063 | if (!lease || lease == &server->invalid_lease) |
52750344 TG |
1064 | continue; |
1065 | ||
1066 | r = server_send_forcerenew(server, lease->address, | |
1067 | lease->gateway, | |
1068 | lease->chaddr); | |
1069 | if (r < 0) | |
1070 | return r; | |
1071 | else | |
1072 | log_dhcp_server(server, "FORCERENEW"); | |
1073 | } | |
1074 | ||
1075 | return r; | |
1076 | } | |
8eb9058d | 1077 | |
64d6c229 | 1078 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { |
8eb9058d LP |
1079 | int r; |
1080 | ||
1081 | assert_return(server, -EINVAL); | |
64d6c229 | 1082 | assert_return(timezone_is_valid(tz), -EINVAL); |
8eb9058d | 1083 | |
64d6c229 | 1084 | if (streq_ptr(tz, server->timezone)) |
8eb9058d LP |
1085 | return 0; |
1086 | ||
64d6c229 | 1087 | r = free_and_strdup(&server->timezone, tz); |
8eb9058d LP |
1088 | if (r < 0) |
1089 | return r; | |
1090 | ||
1091 | return 1; | |
1092 | } | |
586ac6f7 LP |
1093 | |
1094 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1095 | assert_return(server, -EINVAL); | |
1096 | ||
1097 | if (t == server->max_lease_time) | |
1098 | return 0; | |
1099 | ||
1100 | server->max_lease_time = t; | |
1101 | return 1; | |
1102 | } | |
1103 | ||
1104 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1105 | assert_return(server, -EINVAL); | |
1106 | ||
1107 | if (t == server->default_lease_time) | |
1108 | return 0; | |
1109 | ||
1110 | server->default_lease_time = t; | |
1111 | return 1; | |
1112 | } | |
1a04db0f LP |
1113 | |
1114 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], unsigned n) { | |
1115 | assert_return(server, -EINVAL); | |
1116 | assert_return(dns || n <= 0, -EINVAL); | |
1117 | ||
1118 | if (server->n_dns == n && | |
1119 | memcmp(server->dns, dns, sizeof(struct in_addr) * n) == 0) | |
1120 | return 0; | |
1121 | ||
1122 | if (n <= 0) { | |
1123 | server->dns = mfree(server->dns); | |
1124 | server->n_dns = 0; | |
1125 | } else { | |
1126 | struct in_addr *c; | |
1127 | ||
1128 | c = newdup(struct in_addr, dns, n); | |
1129 | if (!c) | |
1130 | return -ENOMEM; | |
1131 | ||
1132 | free(server->dns); | |
1133 | server->dns = c; | |
1134 | server->n_dns = n; | |
1135 | } | |
1136 | ||
1137 | return 1; | |
1138 | } | |
1139 | ||
1140 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], unsigned n) { | |
1141 | assert_return(server, -EINVAL); | |
1142 | assert_return(ntp || n <= 0, -EINVAL); | |
1143 | ||
1144 | if (server->n_ntp == n && | |
1145 | memcmp(server->ntp, ntp, sizeof(struct in_addr) * n) == 0) | |
1146 | return 0; | |
1147 | ||
1148 | if (n <= 0) { | |
1149 | server->ntp = mfree(server->ntp); | |
1150 | server->n_ntp = 0; | |
1151 | } else { | |
1152 | struct in_addr *c; | |
1153 | ||
1154 | c = newdup(struct in_addr, ntp, n); | |
1155 | if (!c) | |
1156 | return -ENOMEM; | |
1157 | ||
1158 | free(server->ntp); | |
1159 | server->ntp = c; | |
1160 | server->n_ntp = n; | |
1161 | } | |
1162 | ||
1163 | return 1; | |
1164 | } | |
77ff6022 CG |
1165 | |
1166 | int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled) { | |
1167 | assert_return(server, -EINVAL); | |
1168 | ||
1169 | if (enabled == server->emit_router) | |
1170 | return 0; | |
1171 | ||
1172 | server->emit_router = enabled; | |
1173 | ||
1174 | return 1; | |
1175 | } |