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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); | |
181 | free(server); | |
b44cd882 TG |
182 | |
183 | return NULL; | |
184 | } | |
185 | ||
3a864fe4 | 186 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
4afd3348 | 187 | _cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL; |
b44cd882 TG |
188 | |
189 | assert_return(ret, -EINVAL); | |
3a864fe4 | 190 | assert_return(ifindex > 0, -EINVAL); |
b44cd882 TG |
191 | |
192 | server = new0(sd_dhcp_server, 1); | |
193 | if (!server) | |
194 | return -ENOMEM; | |
195 | ||
3733eec3 | 196 | server->n_ref = 1; |
8de4a226 | 197 | server->fd_raw = -1; |
ff734080 | 198 | server->fd = -1; |
20af7091 | 199 | server->address = htobe32(INADDR_ANY); |
59b8f6b6 | 200 | server->netmask = htobe32(INADDR_ANY); |
b3ec603c | 201 | server->ifindex = ifindex; |
d5099efc | 202 | server->leases_by_client_id = hashmap_new(&client_id_hash_ops); |
586ac6f7 LP |
203 | server->default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC); |
204 | server->max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC); | |
b44cd882 TG |
205 | |
206 | *ret = server; | |
207 | server = NULL; | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
32d20645 | 212 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int64_t priority) { |
b44cd882 TG |
213 | int r; |
214 | ||
215 | assert_return(server, -EINVAL); | |
216 | assert_return(!server->event, -EBUSY); | |
217 | ||
218 | if (event) | |
219 | server->event = sd_event_ref(event); | |
220 | else { | |
221 | r = sd_event_default(&server->event); | |
222 | if (r < 0) | |
223 | return r; | |
224 | } | |
225 | ||
226 | server->event_priority = priority; | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
232 | assert_return(server, -EINVAL); | |
233 | ||
234 | server->event = sd_event_unref(server->event); | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
240 | assert_return(server, NULL); | |
241 | ||
242 | return server->event; | |
243 | } | |
ff734080 TG |
244 | |
245 | int sd_dhcp_server_stop(sd_dhcp_server *server) { | |
246 | assert_return(server, -EINVAL); | |
247 | ||
248 | server->receive_message = | |
249 | sd_event_source_unref(server->receive_message); | |
250 | ||
8de4a226 | 251 | server->fd_raw = safe_close(server->fd_raw); |
ff734080 TG |
252 | server->fd = safe_close(server->fd); |
253 | ||
254 | log_dhcp_server(server, "STOPPED"); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
a6f1e036 TG |
259 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
260 | DHCPPacket *packet, size_t len) { | |
969b009d TG |
261 | union sockaddr_union link = { |
262 | .ll.sll_family = AF_PACKET, | |
263 | .ll.sll_protocol = htons(ETH_P_IP), | |
b3ec603c | 264 | .ll.sll_ifindex = server->ifindex, |
969b009d TG |
265 | .ll.sll_halen = ETH_ALEN, |
266 | }; | |
969b009d TG |
267 | |
268 | assert(server); | |
b3ec603c | 269 | assert(server->ifindex > 0); |
969b009d TG |
270 | assert(server->address); |
271 | assert(packet); | |
272 | assert(len > sizeof(DHCPPacket)); | |
273 | ||
274 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN); | |
275 | ||
276 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, | |
a6f1e036 TG |
277 | packet->dhcp.yiaddr, |
278 | DHCP_PORT_CLIENT, len); | |
969b009d | 279 | |
b3ec603c | 280 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
969b009d TG |
281 | } |
282 | ||
283 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
8eb7b6a5 | 284 | uint16_t destination_port, |
969b009d TG |
285 | DHCPMessage *message, size_t len) { |
286 | union sockaddr_union dest = { | |
287 | .in.sin_family = AF_INET, | |
8eb7b6a5 | 288 | .in.sin_port = htobe16(destination_port), |
969b009d TG |
289 | .in.sin_addr.s_addr = destination, |
290 | }; | |
291 | struct iovec iov = { | |
292 | .iov_base = message, | |
293 | .iov_len = len, | |
294 | }; | |
295 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))] = {}; | |
296 | struct msghdr msg = { | |
297 | .msg_name = &dest, | |
298 | .msg_namelen = sizeof(dest.in), | |
299 | .msg_iov = &iov, | |
300 | .msg_iovlen = 1, | |
301 | .msg_control = cmsgbuf, | |
302 | .msg_controllen = sizeof(cmsgbuf), | |
303 | }; | |
304 | struct cmsghdr *cmsg; | |
305 | struct in_pktinfo *pktinfo; | |
306 | int r; | |
307 | ||
308 | assert(server); | |
309 | assert(server->fd > 0); | |
310 | assert(message); | |
311 | assert(len > sizeof(DHCPMessage)); | |
312 | ||
313 | cmsg = CMSG_FIRSTHDR(&msg); | |
314 | assert(cmsg); | |
315 | ||
316 | cmsg->cmsg_level = IPPROTO_IP; | |
317 | cmsg->cmsg_type = IP_PKTINFO; | |
318 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
319 | ||
320 | /* we attach source interface and address info to the message | |
321 | rather than binding the socket. This will be mostly useful | |
322 | when we gain support for arbitrary number of server addresses | |
323 | */ | |
324 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
325 | assert(pktinfo); | |
326 | ||
b3ec603c | 327 | pktinfo->ipi_ifindex = server->ifindex; |
969b009d TG |
328 | pktinfo->ipi_spec_dst.s_addr = server->address; |
329 | ||
330 | r = sendmsg(server->fd, &msg, 0); | |
331 | if (r < 0) | |
332 | return -errno; | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static bool requested_broadcast(DHCPRequest *req) { | |
338 | assert(req); | |
339 | ||
340 | return req->message->flags & htobe16(0x8000); | |
341 | } | |
342 | ||
343 | int dhcp_server_send_packet(sd_dhcp_server *server, | |
344 | DHCPRequest *req, DHCPPacket *packet, | |
345 | int type, size_t optoffset) { | |
346 | be32_t destination = INADDR_ANY; | |
8eb7b6a5 | 347 | uint16_t destination_port = DHCP_PORT_CLIENT; |
969b009d TG |
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, | |
22805d92 | 357 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
969b009d TG |
358 | 4, &server->address); |
359 | if (r < 0) | |
360 | return r; | |
361 | ||
362 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 363 | SD_DHCP_OPTION_END, 0, NULL); |
969b009d TG |
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; | |
8eb7b6a5 | 392 | destination_port = DHCP_PORT_SERVER; |
969b009d TG |
393 | if (type == DHCP_NAK) |
394 | packet->dhcp.flags = htobe16(0x8000); | |
395 | } else if (req->message->ciaddr && type != DHCP_NAK) | |
396 | destination = req->message->ciaddr; | |
397 | ||
d6bd972d | 398 | if (destination != INADDR_ANY) |
8eb7b6a5 PF |
399 | return dhcp_server_send_udp(server, destination, |
400 | destination_port, &packet->dhcp, | |
969b009d | 401 | sizeof(DHCPMessage) + optoffset); |
d6bd972d | 402 | else if (requested_broadcast(req) || type == DHCP_NAK) |
a6f1e036 | 403 | return dhcp_server_send_udp(server, INADDR_BROADCAST, |
8eb7b6a5 | 404 | destination_port, &packet->dhcp, |
d6bd972d | 405 | sizeof(DHCPMessage) + optoffset); |
969b009d | 406 | else |
a6f1e036 TG |
407 | /* we cannot send UDP packet to specific MAC address when the |
408 | address is not yet configured, so must fall back to raw | |
409 | packets */ | |
969b009d TG |
410 | return dhcp_server_send_unicast_raw(server, packet, |
411 | sizeof(DHCPPacket) + optoffset); | |
412 | } | |
413 | ||
4dc35568 | 414 | static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret, |
a6f1e036 TG |
415 | uint8_t type, size_t *_optoffset, |
416 | DHCPRequest *req) { | |
4dc35568 | 417 | _cleanup_free_ DHCPPacket *packet = NULL; |
1231c4d2 | 418 | size_t optoffset = 0; |
4dc35568 TG |
419 | int r; |
420 | ||
421 | assert(server); | |
422 | assert(ret); | |
423 | assert(_optoffset); | |
bd57b450 | 424 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)); |
4dc35568 TG |
425 | |
426 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen); | |
427 | if (!packet) | |
428 | return -ENOMEM; | |
429 | ||
a6f1e036 | 430 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
76253e73 DW |
431 | be32toh(req->message->xid), type, ARPHRD_ETHER, |
432 | req->max_optlen, &optoffset); | |
4dc35568 TG |
433 | if (r < 0) |
434 | return r; | |
435 | ||
436 | packet->dhcp.flags = req->message->flags; | |
437 | packet->dhcp.giaddr = req->message->giaddr; | |
438 | memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN); | |
439 | ||
440 | *_optoffset = optoffset; | |
441 | *ret = packet; | |
442 | packet = NULL; | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
a6f1e036 TG |
447 | static int server_send_offer(sd_dhcp_server *server, DHCPRequest *req, |
448 | be32_t address) { | |
4dc35568 TG |
449 | _cleanup_free_ DHCPPacket *packet = NULL; |
450 | size_t offset; | |
451 | be32_t lease_time; | |
452 | int r; | |
453 | ||
454 | r = server_message_init(server, &packet, DHCP_OFFER, &offset, req); | |
455 | if (r < 0) | |
456 | return r; | |
457 | ||
2dead812 | 458 | packet->dhcp.yiaddr = address; |
4dc35568 | 459 | |
c7d9ffe6 | 460 | lease_time = htobe32(req->lifetime); |
4dc35568 | 461 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 462 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 463 | &lease_time); |
4dc35568 TG |
464 | if (r < 0) |
465 | return r; | |
466 | ||
59b8f6b6 | 467 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 468 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
469 | if (r < 0) |
470 | return r; | |
471 | ||
77ff6022 CG |
472 | if (server->emit_router) { |
473 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
474 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
475 | if (r < 0) | |
476 | return r; | |
477 | } | |
59b8f6b6 | 478 | |
4dc35568 TG |
479 | r = dhcp_server_send_packet(server, req, packet, DHCP_OFFER, offset); |
480 | if (r < 0) | |
481 | return r; | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
a6f1e036 TG |
486 | static int server_send_ack(sd_dhcp_server *server, DHCPRequest *req, |
487 | be32_t address) { | |
2dead812 TG |
488 | _cleanup_free_ DHCPPacket *packet = NULL; |
489 | size_t offset; | |
490 | be32_t lease_time; | |
491 | int r; | |
492 | ||
493 | r = server_message_init(server, &packet, DHCP_ACK, &offset, req); | |
494 | if (r < 0) | |
495 | return r; | |
496 | ||
497 | packet->dhcp.yiaddr = address; | |
498 | ||
c7d9ffe6 | 499 | lease_time = htobe32(req->lifetime); |
2dead812 | 500 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 501 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 502 | &lease_time); |
2dead812 TG |
503 | if (r < 0) |
504 | return r; | |
505 | ||
59b8f6b6 | 506 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 507 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
508 | if (r < 0) |
509 | return r; | |
510 | ||
77ff6022 CG |
511 | if (server->emit_router) { |
512 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
513 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
514 | if (r < 0) | |
515 | return r; | |
516 | } | |
59b8f6b6 | 517 | |
1a04db0f LP |
518 | if (server->n_dns > 0) { |
519 | r = dhcp_option_append( | |
520 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 521 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, |
1a04db0f LP |
522 | sizeof(struct in_addr) * server->n_dns, server->dns); |
523 | if (r < 0) | |
524 | return r; | |
525 | } | |
526 | ||
527 | if (server->n_ntp > 0) { | |
528 | r = dhcp_option_append( | |
529 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 530 | SD_DHCP_OPTION_NTP_SERVER, |
1a04db0f LP |
531 | sizeof(struct in_addr) * server->n_ntp, server->ntp); |
532 | if (r < 0) | |
533 | return r; | |
534 | } | |
535 | ||
8eb9058d LP |
536 | if (server->timezone) { |
537 | r = dhcp_option_append( | |
538 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 539 | SD_DHCP_OPTION_NEW_TZDB_TIMEZONE, |
8eb9058d LP |
540 | strlen(server->timezone), server->timezone); |
541 | if (r < 0) | |
542 | return r; | |
543 | } | |
544 | ||
2dead812 TG |
545 | r = dhcp_server_send_packet(server, req, packet, DHCP_ACK, offset); |
546 | if (r < 0) | |
547 | return r; | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
bd57b450 TG |
552 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { |
553 | _cleanup_free_ DHCPPacket *packet = NULL; | |
554 | size_t offset; | |
555 | int r; | |
556 | ||
557 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); | |
558 | if (r < 0) | |
559 | return r; | |
560 | ||
b3ec603c | 561 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
bd57b450 TG |
562 | } |
563 | ||
a6f1e036 TG |
564 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
565 | be32_t gateway, uint8_t chaddr[]) { | |
52750344 TG |
566 | _cleanup_free_ DHCPPacket *packet = NULL; |
567 | size_t optoffset = 0; | |
568 | int r; | |
569 | ||
570 | assert(server); | |
571 | assert(address != INADDR_ANY); | |
572 | assert(chaddr); | |
573 | ||
574 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
575 | if (!packet) | |
576 | return -ENOMEM; | |
577 | ||
578 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
76253e73 DW |
579 | DHCP_FORCERENEW, ARPHRD_ETHER, |
580 | DHCP_MIN_OPTIONS_SIZE, &optoffset); | |
52750344 TG |
581 | if (r < 0) |
582 | return r; | |
583 | ||
584 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
22805d92 | 585 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL); |
52750344 TG |
586 | if (r < 0) |
587 | return r; | |
588 | ||
589 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); | |
590 | ||
8eb7b6a5 PF |
591 | r = dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, |
592 | &packet->dhcp, | |
52750344 | 593 | sizeof(DHCPMessage) + optoffset); |
c15fb62a TA |
594 | if (r < 0) |
595 | return r; | |
52750344 TG |
596 | |
597 | return 0; | |
598 | } | |
599 | ||
b3ec603c | 600 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
89ca10c6 | 601 | DHCPRequest *req = userdata; |
816e2e7a TG |
602 | |
603 | assert(req); | |
604 | ||
605 | switch(code) { | |
22805d92 | 606 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
c7d9ffe6 | 607 | if (len == 4) |
9ae84244 | 608 | req->lifetime = unaligned_read_be32(option); |
c7d9ffe6 TG |
609 | |
610 | break; | |
22805d92 | 611 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
2dead812 | 612 | if (len == 4) |
9ae84244 | 613 | memcpy(&req->requested_ip, option, sizeof(be32_t)); |
2dead812 TG |
614 | |
615 | break; | |
22805d92 | 616 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
816e2e7a | 617 | if (len == 4) |
9ae84244 | 618 | memcpy(&req->server_id, option, sizeof(be32_t)); |
816e2e7a TG |
619 | |
620 | break; | |
22805d92 | 621 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
816e2e7a TG |
622 | if (len >= 2) { |
623 | uint8_t *data; | |
624 | ||
625 | data = memdup(option, len); | |
626 | if (!data) | |
627 | return -ENOMEM; | |
628 | ||
629 | free(req->client_id.data); | |
630 | req->client_id.data = data; | |
631 | req->client_id.length = len; | |
632 | } | |
633 | ||
634 | break; | |
22805d92 | 635 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
76a9d0f1 LP |
636 | |
637 | if (len == 2 && unaligned_read_be16(option) >= sizeof(DHCPPacket)) | |
9ae84244 | 638 | req->max_optlen = unaligned_read_be16(option) - sizeof(DHCPPacket); |
816e2e7a TG |
639 | |
640 | break; | |
641 | } | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
646 | static void dhcp_request_free(DHCPRequest *req) { | |
647 | if (!req) | |
648 | return; | |
649 | ||
650 | free(req->client_id.data); | |
651 | free(req); | |
652 | } | |
653 | ||
654 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
655 | #define _cleanup_dhcp_request_free_ _cleanup_(dhcp_request_freep) | |
656 | ||
586ac6f7 | 657 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
816e2e7a TG |
658 | assert(req); |
659 | assert(message); | |
660 | ||
661 | req->message = message; | |
662 | ||
e2acdb6b | 663 | /* set client id based on MAC address if client did not send an explicit |
a6f1e036 | 664 | one */ |
816e2e7a | 665 | if (!req->client_id.data) { |
9a0f246f | 666 | void *data; |
816e2e7a | 667 | |
9a0f246f | 668 | data = malloc0(ETH_ALEN + 1); |
816e2e7a TG |
669 | if (!data) |
670 | return -ENOMEM; | |
671 | ||
9a0f246f LP |
672 | ((uint8_t*) data)[0] = 0x01; |
673 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN); | |
674 | ||
816e2e7a TG |
675 | req->client_id.length = ETH_ALEN + 1; |
676 | req->client_id.data = data; | |
816e2e7a TG |
677 | } |
678 | ||
679 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) | |
680 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
681 | ||
9a0f246f | 682 | if (req->lifetime <= 0) |
586ac6f7 LP |
683 | req->lifetime = MAX(1ULL, server->default_lease_time); |
684 | ||
685 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
686 | req->lifetime = server->max_lease_time; | |
c7d9ffe6 | 687 | |
816e2e7a TG |
688 | return 0; |
689 | } | |
690 | ||
87322b3a TG |
691 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { |
692 | assert(server); | |
693 | ||
694 | if (!server->pool_size) | |
695 | return -EINVAL; | |
696 | ||
99634696 TG |
697 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
698 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
699 | return -ERANGE; | |
87322b3a | 700 | |
99634696 | 701 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
87322b3a TG |
702 | } |
703 | ||
83cedf7a TG |
704 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
705 | ||
be077570 TG |
706 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, |
707 | size_t length) { | |
816e2e7a | 708 | _cleanup_dhcp_request_free_ DHCPRequest *req = NULL; |
f693e9b3 | 709 | _cleanup_free_ char *error_message = NULL; |
87322b3a | 710 | DHCPLease *existing_lease; |
816e2e7a | 711 | int type, r; |
be077570 TG |
712 | |
713 | assert(server); | |
714 | assert(message); | |
715 | ||
716 | if (message->op != BOOTREQUEST || | |
717 | message->htype != ARPHRD_ETHER || | |
718 | message->hlen != ETHER_ADDR_LEN) | |
719 | return 0; | |
720 | ||
816e2e7a TG |
721 | req = new0(DHCPRequest, 1); |
722 | if (!req) | |
723 | return -ENOMEM; | |
724 | ||
f693e9b3 | 725 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
be077570 TG |
726 | if (type < 0) |
727 | return 0; | |
728 | ||
586ac6f7 | 729 | r = ensure_sane_request(server, req, message); |
816e2e7a TG |
730 | if (r < 0) |
731 | /* this only fails on critical errors */ | |
732 | return r; | |
733 | ||
a6f1e036 TG |
734 | existing_lease = hashmap_get(server->leases_by_client_id, |
735 | &req->client_id); | |
87322b3a | 736 | |
4dc35568 | 737 | switch(type) { |
9a0f246f LP |
738 | |
739 | case DHCP_DISCOVER: { | |
87322b3a TG |
740 | be32_t address = INADDR_ANY; |
741 | unsigned i; | |
2dead812 | 742 | |
4dc35568 TG |
743 | log_dhcp_server(server, "DISCOVER (0x%x)", |
744 | be32toh(req->message->xid)); | |
745 | ||
2dead812 TG |
746 | if (!server->pool_size) |
747 | /* no pool allocated */ | |
748 | return 0; | |
749 | ||
87322b3a TG |
750 | /* for now pick a random free address from the pool */ |
751 | if (existing_lease) | |
752 | address = existing_lease->address; | |
753 | else { | |
b826ab58 | 754 | struct siphash state; |
0cb3c286 | 755 | uint64_t hash; |
99634696 | 756 | uint32_t next_offer; |
83cedf7a TG |
757 | |
758 | /* even with no persistence of leases, we try to offer the same client | |
759 | the same IP address. we do this by using the hash of the client id | |
760 | as the offset into the pool of leases when finding the next free one */ | |
761 | ||
0cb3c286 | 762 | siphash24_init(&state, HASH_KEY.bytes); |
b826ab58 | 763 | client_id_hash_func(&req->client_id, &state); |
933f9cae | 764 | hash = htole64(siphash24_finalize(&state)); |
0cb3c286 | 765 | next_offer = hash % server->pool_size; |
83cedf7a | 766 | |
87322b3a | 767 | for (i = 0; i < server->pool_size; i++) { |
83cedf7a | 768 | if (!server->bound_leases[next_offer]) { |
99634696 | 769 | address = server->subnet | htobe32(server->pool_offset + next_offer); |
87322b3a TG |
770 | break; |
771 | } else | |
83cedf7a | 772 | next_offer = (next_offer + 1) % server->pool_size; |
87322b3a TG |
773 | } |
774 | } | |
775 | ||
776 | if (address == INADDR_ANY) | |
777 | /* no free addresses left */ | |
778 | return 0; | |
2dead812 TG |
779 | |
780 | r = server_send_offer(server, req, address); | |
4dc35568 TG |
781 | if (r < 0) { |
782 | /* this only fails on critical errors */ | |
783 | log_dhcp_server(server, "could not send offer: %s", | |
784 | strerror(-r)); | |
785 | return r; | |
786 | } else { | |
787 | log_dhcp_server(server, "OFFER (0x%x)", | |
788 | be32toh(req->message->xid)); | |
789 | return DHCP_OFFER; | |
790 | } | |
be077570 | 791 | |
4dc35568 TG |
792 | break; |
793 | } | |
5b34277c | 794 | case DHCP_DECLINE: |
f693e9b3 | 795 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message)); |
5b34277c TG |
796 | |
797 | /* TODO: make sure we don't offer this address again */ | |
798 | ||
799 | return 1; | |
800 | ||
9a0f246f | 801 | case DHCP_REQUEST: { |
2dead812 | 802 | be32_t address; |
bd57b450 | 803 | bool init_reboot = false; |
87322b3a | 804 | int pool_offset; |
2dead812 TG |
805 | |
806 | /* see RFC 2131, section 4.3.2 */ | |
807 | ||
808 | if (req->server_id) { | |
809 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", | |
810 | be32toh(req->message->xid)); | |
811 | ||
812 | /* SELECTING */ | |
813 | if (req->server_id != server->address) | |
814 | /* client did not pick us */ | |
815 | return 0; | |
816 | ||
817 | if (req->message->ciaddr) | |
818 | /* this MUST be zero */ | |
819 | return 0; | |
820 | ||
821 | if (!req->requested_ip) | |
822 | /* this must be filled in with the yiaddr | |
823 | from the chosen OFFER */ | |
824 | return 0; | |
825 | ||
826 | address = req->requested_ip; | |
827 | } else if (req->requested_ip) { | |
828 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", | |
829 | be32toh(req->message->xid)); | |
830 | ||
831 | /* INIT-REBOOT */ | |
832 | if (req->message->ciaddr) | |
833 | /* this MUST be zero */ | |
834 | return 0; | |
835 | ||
bd57b450 | 836 | /* TODO: check more carefully if IP is correct */ |
2dead812 | 837 | address = req->requested_ip; |
bd57b450 | 838 | init_reboot = true; |
2dead812 TG |
839 | } else { |
840 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
841 | be32toh(req->message->xid)); | |
842 | ||
843 | /* REBINDING / RENEWING */ | |
844 | if (!req->message->ciaddr) | |
845 | /* this MUST be filled in with clients IP address */ | |
846 | return 0; | |
847 | ||
848 | address = req->message->ciaddr; | |
849 | } | |
850 | ||
87322b3a TG |
851 | pool_offset = get_pool_offset(server, address); |
852 | ||
853 | /* verify that the requested address is from the pool, and either | |
854 | owned by the current client or free */ | |
855 | if (pool_offset >= 0 && | |
856 | server->bound_leases[pool_offset] == existing_lease) { | |
857 | DHCPLease *lease; | |
a7f7d1bd | 858 | usec_t time_now = 0; |
87322b3a TG |
859 | |
860 | if (!existing_lease) { | |
861 | lease = new0(DHCPLease, 1); | |
862 | lease->address = req->requested_ip; | |
863 | lease->client_id.data = memdup(req->client_id.data, | |
864 | req->client_id.length); | |
02557f97 TA |
865 | if (!lease->client_id.data) { |
866 | free(lease); | |
87322b3a | 867 | return -ENOMEM; |
02557f97 | 868 | } |
87322b3a | 869 | lease->client_id.length = req->client_id.length; |
a6f1e036 TG |
870 | memcpy(&lease->chaddr, &req->message->chaddr, |
871 | ETH_ALEN); | |
52750344 | 872 | lease->gateway = req->message->giaddr; |
87322b3a TG |
873 | } else |
874 | lease = existing_lease; | |
875 | ||
a6f1e036 TG |
876 | r = sd_event_now(server->event, |
877 | clock_boottime_or_monotonic(), | |
878 | &time_now); | |
bff92d2c SS |
879 | if (r < 0) { |
880 | if (!existing_lease) | |
881 | dhcp_lease_free(lease); | |
38a03f06 | 882 | return r; |
bff92d2c SS |
883 | } |
884 | ||
87322b3a TG |
885 | lease->expiration = req->lifetime * USEC_PER_SEC + time_now; |
886 | ||
2dead812 TG |
887 | r = server_send_ack(server, req, address); |
888 | if (r < 0) { | |
889 | /* this only fails on critical errors */ | |
890 | log_dhcp_server(server, "could not send ack: %s", | |
891 | strerror(-r)); | |
87322b3a TG |
892 | |
893 | if (!existing_lease) | |
894 | dhcp_lease_free(lease); | |
895 | ||
2dead812 TG |
896 | return r; |
897 | } else { | |
898 | log_dhcp_server(server, "ACK (0x%x)", | |
899 | be32toh(req->message->xid)); | |
87322b3a TG |
900 | |
901 | server->bound_leases[pool_offset] = lease; | |
a6f1e036 TG |
902 | hashmap_put(server->leases_by_client_id, |
903 | &lease->client_id, lease); | |
87322b3a | 904 | |
2dead812 TG |
905 | return DHCP_ACK; |
906 | } | |
bd57b450 TG |
907 | } else if (init_reboot) { |
908 | r = server_send_nak(server, req); | |
909 | if (r < 0) { | |
910 | /* this only fails on critical errors */ | |
911 | log_dhcp_server(server, "could not send nak: %s", | |
912 | strerror(-r)); | |
913 | return r; | |
914 | } else { | |
915 | log_dhcp_server(server, "NAK (0x%x)", | |
916 | be32toh(req->message->xid)); | |
917 | return DHCP_NAK; | |
918 | } | |
919 | } | |
2dead812 TG |
920 | |
921 | break; | |
922 | } | |
9a0f246f | 923 | |
500792d8 TG |
924 | case DHCP_RELEASE: { |
925 | int pool_offset; | |
926 | ||
927 | log_dhcp_server(server, "RELEASE (0x%x)", | |
928 | be32toh(req->message->xid)); | |
929 | ||
930 | if (!existing_lease) | |
931 | return 0; | |
932 | ||
933 | if (existing_lease->address != req->message->ciaddr) | |
934 | return 0; | |
935 | ||
936 | pool_offset = get_pool_offset(server, req->message->ciaddr); | |
937 | if (pool_offset < 0) | |
938 | return 0; | |
939 | ||
940 | if (server->bound_leases[pool_offset] == existing_lease) { | |
941 | server->bound_leases[pool_offset] = NULL; | |
942 | hashmap_remove(server->leases_by_client_id, existing_lease); | |
943 | dhcp_lease_free(existing_lease); | |
944 | ||
945 | return 1; | |
946 | } else | |
947 | return 0; | |
948 | } | |
2dead812 | 949 | } |
4dc35568 TG |
950 | |
951 | return 0; | |
be077570 TG |
952 | } |
953 | ||
ff734080 TG |
954 | static int server_receive_message(sd_event_source *s, int fd, |
955 | uint32_t revents, void *userdata) { | |
be077570 | 956 | _cleanup_free_ DHCPMessage *message = NULL; |
3a864fe4 | 957 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))]; |
ff734080 TG |
958 | sd_dhcp_server *server = userdata; |
959 | struct iovec iov = {}; | |
960 | struct msghdr msg = { | |
961 | .msg_iov = &iov, | |
962 | .msg_iovlen = 1, | |
3a864fe4 TG |
963 | .msg_control = cmsgbuf, |
964 | .msg_controllen = sizeof(cmsgbuf), | |
ff734080 | 965 | }; |
3a864fe4 | 966 | struct cmsghdr *cmsg; |
4edc2c9b | 967 | ssize_t buflen, len; |
ff734080 TG |
968 | |
969 | assert(server); | |
970 | ||
4edc2c9b LP |
971 | buflen = next_datagram_size_fd(fd); |
972 | if (buflen < 0) | |
973 | return buflen; | |
ff734080 | 974 | |
0d43d2fc | 975 | message = malloc(buflen); |
ff734080 TG |
976 | if (!message) |
977 | return -ENOMEM; | |
978 | ||
979 | iov.iov_base = message; | |
980 | iov.iov_len = buflen; | |
981 | ||
a38d9945 | 982 | len = recvmsg(fd, &msg, 0); |
0d43d2fc TG |
983 | if (len < 0) { |
984 | if (errno == EAGAIN || errno == EINTR) | |
985 | return 0; | |
986 | ||
987 | return -errno; | |
988 | } else if ((size_t)len < sizeof(DHCPMessage)) | |
be077570 | 989 | return 0; |
ff734080 | 990 | |
2a1288ff | 991 | CMSG_FOREACH(cmsg, &msg) { |
3a864fe4 TG |
992 | if (cmsg->cmsg_level == IPPROTO_IP && |
993 | cmsg->cmsg_type == IP_PKTINFO && | |
994 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) { | |
995 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg); | |
996 | ||
a6f1e036 TG |
997 | /* TODO figure out if this can be done as a filter on |
998 | * the socket, like for IPv6 */ | |
b3ec603c | 999 | if (server->ifindex != info->ipi_ifindex) |
3a864fe4 TG |
1000 | return 0; |
1001 | ||
1002 | break; | |
1003 | } | |
1004 | } | |
1005 | ||
be077570 | 1006 | return dhcp_server_handle_message(server, message, (size_t)len); |
ff734080 TG |
1007 | } |
1008 | ||
1009 | int sd_dhcp_server_start(sd_dhcp_server *server) { | |
1010 | int r; | |
1011 | ||
1012 | assert_return(server, -EINVAL); | |
1013 | assert_return(server->event, -EINVAL); | |
1014 | assert_return(!server->receive_message, -EBUSY); | |
8de4a226 | 1015 | assert_return(server->fd_raw == -1, -EBUSY); |
ff734080 | 1016 | assert_return(server->fd == -1, -EBUSY); |
20af7091 | 1017 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH); |
ff734080 | 1018 | |
8de4a226 TG |
1019 | r = socket(AF_PACKET, SOCK_DGRAM | SOCK_NONBLOCK, 0); |
1020 | if (r < 0) { | |
1021 | r = -errno; | |
1022 | sd_dhcp_server_stop(server); | |
1023 | return r; | |
1024 | } | |
1025 | server->fd_raw = r; | |
1026 | ||
ff734080 TG |
1027 | r = dhcp_network_bind_udp_socket(INADDR_ANY, DHCP_PORT_SERVER); |
1028 | if (r < 0) { | |
1029 | sd_dhcp_server_stop(server); | |
1030 | return r; | |
1031 | } | |
1032 | server->fd = r; | |
1033 | ||
1034 | r = sd_event_add_io(server->event, &server->receive_message, | |
1035 | server->fd, EPOLLIN, | |
1036 | server_receive_message, server); | |
1037 | if (r < 0) { | |
1038 | sd_dhcp_server_stop(server); | |
1039 | return r; | |
1040 | } | |
1041 | ||
1042 | r = sd_event_source_set_priority(server->receive_message, | |
1043 | server->event_priority); | |
1044 | if (r < 0) { | |
1045 | sd_dhcp_server_stop(server); | |
1046 | return r; | |
1047 | } | |
1048 | ||
1049 | log_dhcp_server(server, "STARTED"); | |
1050 | ||
1051 | return 0; | |
1052 | } | |
52750344 TG |
1053 | |
1054 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { | |
1055 | unsigned i; | |
621ac3d2 | 1056 | int r = 0; |
52750344 TG |
1057 | |
1058 | assert_return(server, -EINVAL); | |
1059 | assert(server->bound_leases); | |
1060 | ||
1061 | for (i = 0; i < server->pool_size; i++) { | |
1062 | DHCPLease *lease = server->bound_leases[i]; | |
1063 | ||
99634696 | 1064 | if (!lease || lease == &server->invalid_lease) |
52750344 TG |
1065 | continue; |
1066 | ||
1067 | r = server_send_forcerenew(server, lease->address, | |
1068 | lease->gateway, | |
1069 | lease->chaddr); | |
1070 | if (r < 0) | |
1071 | return r; | |
1072 | else | |
1073 | log_dhcp_server(server, "FORCERENEW"); | |
1074 | } | |
1075 | ||
1076 | return r; | |
1077 | } | |
8eb9058d | 1078 | |
64d6c229 | 1079 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { |
8eb9058d LP |
1080 | int r; |
1081 | ||
1082 | assert_return(server, -EINVAL); | |
64d6c229 | 1083 | assert_return(timezone_is_valid(tz), -EINVAL); |
8eb9058d | 1084 | |
64d6c229 | 1085 | if (streq_ptr(tz, server->timezone)) |
8eb9058d LP |
1086 | return 0; |
1087 | ||
64d6c229 | 1088 | r = free_and_strdup(&server->timezone, tz); |
8eb9058d LP |
1089 | if (r < 0) |
1090 | return r; | |
1091 | ||
1092 | return 1; | |
1093 | } | |
586ac6f7 LP |
1094 | |
1095 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1096 | assert_return(server, -EINVAL); | |
1097 | ||
1098 | if (t == server->max_lease_time) | |
1099 | return 0; | |
1100 | ||
1101 | server->max_lease_time = t; | |
1102 | return 1; | |
1103 | } | |
1104 | ||
1105 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1106 | assert_return(server, -EINVAL); | |
1107 | ||
1108 | if (t == server->default_lease_time) | |
1109 | return 0; | |
1110 | ||
1111 | server->default_lease_time = t; | |
1112 | return 1; | |
1113 | } | |
1a04db0f LP |
1114 | |
1115 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], unsigned n) { | |
1116 | assert_return(server, -EINVAL); | |
1117 | assert_return(dns || n <= 0, -EINVAL); | |
1118 | ||
1119 | if (server->n_dns == n && | |
1120 | memcmp(server->dns, dns, sizeof(struct in_addr) * n) == 0) | |
1121 | return 0; | |
1122 | ||
1123 | if (n <= 0) { | |
1124 | server->dns = mfree(server->dns); | |
1125 | server->n_dns = 0; | |
1126 | } else { | |
1127 | struct in_addr *c; | |
1128 | ||
1129 | c = newdup(struct in_addr, dns, n); | |
1130 | if (!c) | |
1131 | return -ENOMEM; | |
1132 | ||
1133 | free(server->dns); | |
1134 | server->dns = c; | |
1135 | server->n_dns = n; | |
1136 | } | |
1137 | ||
1138 | return 1; | |
1139 | } | |
1140 | ||
1141 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], unsigned n) { | |
1142 | assert_return(server, -EINVAL); | |
1143 | assert_return(ntp || n <= 0, -EINVAL); | |
1144 | ||
1145 | if (server->n_ntp == n && | |
1146 | memcmp(server->ntp, ntp, sizeof(struct in_addr) * n) == 0) | |
1147 | return 0; | |
1148 | ||
1149 | if (n <= 0) { | |
1150 | server->ntp = mfree(server->ntp); | |
1151 | server->n_ntp = 0; | |
1152 | } else { | |
1153 | struct in_addr *c; | |
1154 | ||
1155 | c = newdup(struct in_addr, ntp, n); | |
1156 | if (!c) | |
1157 | return -ENOMEM; | |
1158 | ||
1159 | free(server->ntp); | |
1160 | server->ntp = c; | |
1161 | server->n_ntp = n; | |
1162 | } | |
1163 | ||
1164 | return 1; | |
1165 | } | |
77ff6022 CG |
1166 | |
1167 | int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled) { | |
1168 | assert_return(server, -EINVAL); | |
1169 | ||
1170 | if (enabled == server->emit_router) | |
1171 | return 0; | |
1172 | ||
1173 | server->emit_router = enabled; | |
1174 | ||
1175 | return 1; | |
1176 | } |