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52ad194e | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
e842803a | 2 | /*** |
b012e921 | 3 | Copyright © 2013 Intel Corporation. All rights reserved. |
e842803a MB |
4 | ***/ |
5 | ||
6 | #include <sys/ioctl.h> | |
e842803a | 7 | |
e842803a | 8 | #include "sd-dhcp-server.h" |
db2df898 MP |
9 | |
10 | #include "alloc-util.h" | |
e842803a | 11 | #include "dhcp-internal.h" |
db2df898 MP |
12 | #include "dhcp-server-internal.h" |
13 | #include "fd-util.h" | |
14 | #include "in-addr-util.h" | |
6e866b33 | 15 | #include "io-util.h" |
1d42b86d | 16 | #include "sd-id128.h" |
db2df898 MP |
17 | #include "siphash24.h" |
18 | #include "string-util.h" | |
5a920b42 | 19 | #include "unaligned.h" |
e842803a | 20 | |
d9dfd233 MP |
21 | #define DHCP_DEFAULT_LEASE_TIME_USEC USEC_PER_HOUR |
22 | #define DHCP_MAX_LEASE_TIME_USEC (USEC_PER_HOUR*12) | |
23 | ||
6e866b33 | 24 | static DHCPLease *dhcp_lease_free(DHCPLease *lease) { |
81c58355 | 25 | if (!lease) |
6e866b33 | 26 | return NULL; |
81c58355 MB |
27 | |
28 | free(lease->client_id.data); | |
6e866b33 | 29 | return mfree(lease); |
81c58355 MB |
30 | } |
31 | ||
d9dfd233 MP |
32 | /* configures the server's address and subnet, and optionally the pool's size and offset into the subnet |
33 | * the whole pool must fit into the subnet, and may not contain the first (any) nor last (broadcast) address | |
34 | * moreover, the server's own address may be in the pool, and is in that case reserved in order not to | |
35 | * accidentally hand it out */ | |
36 | int sd_dhcp_server_configure_pool(sd_dhcp_server *server, struct in_addr *address, unsigned char prefixlen, uint32_t offset, uint32_t size) { | |
37 | struct in_addr netmask_addr; | |
38 | be32_t netmask; | |
39 | uint32_t server_off, broadcast_off, size_max; | |
e842803a | 40 | |
e842803a MB |
41 | assert_return(server, -EINVAL); |
42 | assert_return(address, -EINVAL); | |
d9dfd233 MP |
43 | assert_return(address->s_addr != INADDR_ANY, -EINVAL); |
44 | assert_return(prefixlen <= 32, -ERANGE); | |
d9dfd233 | 45 | |
f5e65279 | 46 | assert_se(in4_addr_prefixlen_to_netmask(&netmask_addr, prefixlen)); |
d9dfd233 MP |
47 | netmask = netmask_addr.s_addr; |
48 | ||
49 | server_off = be32toh(address->s_addr & ~netmask); | |
50 | broadcast_off = be32toh(~netmask); | |
51 | ||
52 | /* the server address cannot be the subnet address */ | |
53 | assert_return(server_off != 0, -ERANGE); | |
54 | ||
55 | /* nor the broadcast address */ | |
56 | assert_return(server_off != broadcast_off, -ERANGE); | |
57 | ||
58 | /* 0 offset means we should set a default, we skip the first (subnet) address | |
59 | and take the next one */ | |
60 | if (offset == 0) | |
61 | offset = 1; | |
62 | ||
63 | size_max = (broadcast_off + 1) /* the number of addresses in the subnet */ | |
64 | - offset /* exclude the addresses before the offset */ | |
65 | - 1; /* exclude the last (broadcast) address */ | |
66 | ||
67 | /* The pool must contain at least one address */ | |
68 | assert_return(size_max >= 1, -ERANGE); | |
69 | ||
70 | if (size != 0) | |
71 | assert_return(size <= size_max, -ERANGE); | |
72 | else | |
73 | size = size_max; | |
e842803a | 74 | |
81c58355 | 75 | if (server->address != address->s_addr || server->netmask != netmask || server->pool_size != size || server->pool_offset != offset) { |
81c58355 MB |
76 | |
77 | free(server->bound_leases); | |
78 | server->bound_leases = new0(DHCPLease*, size); | |
79 | if (!server->bound_leases) | |
80 | return -ENOMEM; | |
81 | ||
82 | server->pool_offset = offset; | |
83 | server->pool_size = size; | |
e842803a | 84 | |
81c58355 MB |
85 | server->address = address->s_addr; |
86 | server->netmask = netmask; | |
87 | server->subnet = address->s_addr & netmask; | |
e842803a | 88 | |
81c58355 MB |
89 | if (server_off >= offset && server_off - offset < size) |
90 | server->bound_leases[server_off - offset] = &server->invalid_lease; | |
d9dfd233 | 91 | |
81c58355 | 92 | /* Drop any leases associated with the old address range */ |
6e866b33 | 93 | hashmap_clear(server->leases_by_client_id); |
81c58355 | 94 | } |
e842803a MB |
95 | |
96 | return 0; | |
97 | } | |
98 | ||
db2df898 | 99 | int sd_dhcp_server_is_running(sd_dhcp_server *server) { |
13d276d0 | 100 | assert_return(server, false); |
e842803a MB |
101 | |
102 | return !!server->receive_message; | |
103 | } | |
104 | ||
6e866b33 | 105 | void client_id_hash_func(const DHCPClientId *id, struct siphash *state) { |
e842803a MB |
106 | assert(id); |
107 | assert(id->length); | |
108 | assert(id->data); | |
109 | ||
6300502b MP |
110 | siphash24_compress(&id->length, sizeof(id->length), state); |
111 | siphash24_compress(id->data, id->length, state); | |
e842803a MB |
112 | } |
113 | ||
6e866b33 MB |
114 | int client_id_compare_func(const DHCPClientId *a, const DHCPClientId *b) { |
115 | int r; | |
e842803a MB |
116 | |
117 | assert(!a->length || a->data); | |
118 | assert(!b->length || b->data); | |
119 | ||
6e866b33 MB |
120 | r = CMP(a->length, b->length); |
121 | if (r != 0) | |
122 | return r; | |
e842803a MB |
123 | |
124 | return memcmp(a->data, b->data, a->length); | |
125 | } | |
126 | ||
6e866b33 MB |
127 | DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(dhcp_lease_hash_ops, DHCPClientId, client_id_hash_func, client_id_compare_func, |
128 | DHCPLease, dhcp_lease_free); | |
d9dfd233 | 129 | |
6e866b33 MB |
130 | static sd_dhcp_server *dhcp_server_free(sd_dhcp_server *server) { |
131 | assert(server); | |
e842803a MB |
132 | |
133 | log_dhcp_server(server, "UNREF"); | |
134 | ||
135 | sd_dhcp_server_stop(server); | |
136 | ||
137 | sd_event_unref(server->event); | |
138 | ||
d9dfd233 MP |
139 | free(server->timezone); |
140 | free(server->dns); | |
141 | free(server->ntp); | |
142 | ||
e842803a MB |
143 | hashmap_free(server->leases_by_client_id); |
144 | ||
145 | free(server->bound_leases); | |
8a584da2 | 146 | return mfree(server); |
e842803a MB |
147 | } |
148 | ||
6e866b33 MB |
149 | DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_server, sd_dhcp_server, dhcp_server_free); |
150 | ||
e842803a | 151 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
4c89c718 | 152 | _cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL; |
e842803a MB |
153 | |
154 | assert_return(ret, -EINVAL); | |
155 | assert_return(ifindex > 0, -EINVAL); | |
156 | ||
157 | server = new0(sd_dhcp_server, 1); | |
158 | if (!server) | |
159 | return -ENOMEM; | |
160 | ||
d9dfd233 | 161 | server->n_ref = 1; |
e842803a MB |
162 | server->fd_raw = -1; |
163 | server->fd = -1; | |
164 | server->address = htobe32(INADDR_ANY); | |
5eef597e | 165 | server->netmask = htobe32(INADDR_ANY); |
d9dfd233 | 166 | server->ifindex = ifindex; |
81c58355 | 167 | |
6e866b33 | 168 | server->leases_by_client_id = hashmap_new(&dhcp_lease_hash_ops); |
81c58355 MB |
169 | if (!server->leases_by_client_id) |
170 | return -ENOMEM; | |
171 | ||
d9dfd233 MP |
172 | server->default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC); |
173 | server->max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC); | |
e842803a | 174 | |
b012e921 | 175 | *ret = TAKE_PTR(server); |
e842803a MB |
176 | |
177 | return 0; | |
178 | } | |
179 | ||
aa27b158 | 180 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int64_t priority) { |
e842803a MB |
181 | int r; |
182 | ||
183 | assert_return(server, -EINVAL); | |
184 | assert_return(!server->event, -EBUSY); | |
185 | ||
186 | if (event) | |
187 | server->event = sd_event_ref(event); | |
188 | else { | |
189 | r = sd_event_default(&server->event); | |
190 | if (r < 0) | |
191 | return r; | |
192 | } | |
193 | ||
194 | server->event_priority = priority; | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
200 | assert_return(server, -EINVAL); | |
201 | ||
202 | server->event = sd_event_unref(server->event); | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
208 | assert_return(server, NULL); | |
209 | ||
210 | return server->event; | |
211 | } | |
212 | ||
213 | int sd_dhcp_server_stop(sd_dhcp_server *server) { | |
214 | assert_return(server, -EINVAL); | |
215 | ||
216 | server->receive_message = | |
217 | sd_event_source_unref(server->receive_message); | |
218 | ||
219 | server->fd_raw = safe_close(server->fd_raw); | |
220 | server->fd = safe_close(server->fd); | |
221 | ||
222 | log_dhcp_server(server, "STOPPED"); | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
5eef597e MP |
227 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
228 | DHCPPacket *packet, size_t len) { | |
e842803a MB |
229 | union sockaddr_union link = { |
230 | .ll.sll_family = AF_PACKET, | |
5a920b42 | 231 | .ll.sll_protocol = htobe16(ETH_P_IP), |
d9dfd233 | 232 | .ll.sll_ifindex = server->ifindex, |
e842803a MB |
233 | .ll.sll_halen = ETH_ALEN, |
234 | }; | |
e842803a MB |
235 | |
236 | assert(server); | |
d9dfd233 | 237 | assert(server->ifindex > 0); |
e842803a MB |
238 | assert(server->address); |
239 | assert(packet); | |
240 | assert(len > sizeof(DHCPPacket)); | |
241 | ||
242 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN); | |
243 | ||
244 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, | |
5eef597e MP |
245 | packet->dhcp.yiaddr, |
246 | DHCP_PORT_CLIENT, len); | |
e842803a | 247 | |
d9dfd233 | 248 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
e842803a MB |
249 | } |
250 | ||
251 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
aa27b158 | 252 | uint16_t destination_port, |
e842803a MB |
253 | DHCPMessage *message, size_t len) { |
254 | union sockaddr_union dest = { | |
255 | .in.sin_family = AF_INET, | |
aa27b158 | 256 | .in.sin_port = htobe16(destination_port), |
e842803a MB |
257 | .in.sin_addr.s_addr = destination, |
258 | }; | |
259 | struct iovec iov = { | |
260 | .iov_base = message, | |
261 | .iov_len = len, | |
262 | }; | |
263 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))] = {}; | |
264 | struct msghdr msg = { | |
265 | .msg_name = &dest, | |
266 | .msg_namelen = sizeof(dest.in), | |
267 | .msg_iov = &iov, | |
268 | .msg_iovlen = 1, | |
269 | .msg_control = cmsgbuf, | |
270 | .msg_controllen = sizeof(cmsgbuf), | |
271 | }; | |
272 | struct cmsghdr *cmsg; | |
273 | struct in_pktinfo *pktinfo; | |
e842803a MB |
274 | |
275 | assert(server); | |
98393f85 | 276 | assert(server->fd >= 0); |
e842803a MB |
277 | assert(message); |
278 | assert(len > sizeof(DHCPMessage)); | |
279 | ||
280 | cmsg = CMSG_FIRSTHDR(&msg); | |
281 | assert(cmsg); | |
282 | ||
283 | cmsg->cmsg_level = IPPROTO_IP; | |
284 | cmsg->cmsg_type = IP_PKTINFO; | |
285 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
286 | ||
287 | /* we attach source interface and address info to the message | |
288 | rather than binding the socket. This will be mostly useful | |
289 | when we gain support for arbitrary number of server addresses | |
290 | */ | |
291 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
292 | assert(pktinfo); | |
293 | ||
d9dfd233 | 294 | pktinfo->ipi_ifindex = server->ifindex; |
e842803a MB |
295 | pktinfo->ipi_spec_dst.s_addr = server->address; |
296 | ||
b012e921 | 297 | if (sendmsg(server->fd, &msg, 0) < 0) |
e842803a MB |
298 | return -errno; |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | static bool requested_broadcast(DHCPRequest *req) { | |
304 | assert(req); | |
305 | ||
306 | return req->message->flags & htobe16(0x8000); | |
307 | } | |
308 | ||
309 | int dhcp_server_send_packet(sd_dhcp_server *server, | |
310 | DHCPRequest *req, DHCPPacket *packet, | |
311 | int type, size_t optoffset) { | |
312 | be32_t destination = INADDR_ANY; | |
aa27b158 | 313 | uint16_t destination_port = DHCP_PORT_CLIENT; |
e842803a MB |
314 | int r; |
315 | ||
316 | assert(server); | |
317 | assert(req); | |
318 | assert(req->max_optlen); | |
319 | assert(optoffset <= req->max_optlen); | |
320 | assert(packet); | |
321 | ||
322 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
4c89c718 | 323 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
e842803a MB |
324 | 4, &server->address); |
325 | if (r < 0) | |
326 | return r; | |
327 | ||
328 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
4c89c718 | 329 | SD_DHCP_OPTION_END, 0, NULL); |
e842803a MB |
330 | if (r < 0) |
331 | return r; | |
332 | ||
333 | /* RFC 2131 Section 4.1 | |
334 | ||
335 | If the ’giaddr’ field in a DHCP message from a client is non-zero, | |
336 | the server sends any return messages to the ’DHCP server’ port on the | |
337 | BOOTP relay agent whose address appears in ’giaddr’. If the ’giaddr’ | |
338 | field is zero and the ’ciaddr’ field is nonzero, then the server | |
339 | unicasts DHCPOFFER and DHCPACK messages to the address in ’ciaddr’. | |
340 | If ’giaddr’ is zero and ’ciaddr’ is zero, and the broadcast bit is | |
341 | set, then the server broadcasts DHCPOFFER and DHCPACK messages to | |
342 | 0xffffffff. If the broadcast bit is not set and ’giaddr’ is zero and | |
343 | ’ciaddr’ is zero, then the server unicasts DHCPOFFER and DHCPACK | |
344 | messages to the client’s hardware address and ’yiaddr’ address. In | |
345 | all cases, when ’giaddr’ is zero, the server broadcasts any DHCPNAK | |
346 | messages to 0xffffffff. | |
347 | ||
348 | Section 4.3.2 | |
349 | ||
350 | If ’giaddr’ is set in the DHCPREQUEST message, the client is on a | |
351 | different subnet. The server MUST set the broadcast bit in the | |
352 | DHCPNAK, so that the relay agent will broadcast the DHCPNAK to the | |
353 | client, because the client may not have a correct network address | |
354 | or subnet mask, and the client may not be answering ARP requests. | |
355 | */ | |
356 | if (req->message->giaddr) { | |
357 | destination = req->message->giaddr; | |
aa27b158 | 358 | destination_port = DHCP_PORT_SERVER; |
e842803a MB |
359 | if (type == DHCP_NAK) |
360 | packet->dhcp.flags = htobe16(0x8000); | |
361 | } else if (req->message->ciaddr && type != DHCP_NAK) | |
362 | destination = req->message->ciaddr; | |
363 | ||
364 | if (destination != INADDR_ANY) | |
aa27b158 MP |
365 | return dhcp_server_send_udp(server, destination, |
366 | destination_port, &packet->dhcp, | |
e842803a MB |
367 | sizeof(DHCPMessage) + optoffset); |
368 | else if (requested_broadcast(req) || type == DHCP_NAK) | |
5eef597e | 369 | return dhcp_server_send_udp(server, INADDR_BROADCAST, |
aa27b158 | 370 | destination_port, &packet->dhcp, |
e842803a MB |
371 | sizeof(DHCPMessage) + optoffset); |
372 | else | |
5eef597e MP |
373 | /* we cannot send UDP packet to specific MAC address when the |
374 | address is not yet configured, so must fall back to raw | |
375 | packets */ | |
e842803a MB |
376 | return dhcp_server_send_unicast_raw(server, packet, |
377 | sizeof(DHCPPacket) + optoffset); | |
378 | } | |
379 | ||
380 | static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret, | |
5eef597e MP |
381 | uint8_t type, size_t *_optoffset, |
382 | DHCPRequest *req) { | |
e842803a | 383 | _cleanup_free_ DHCPPacket *packet = NULL; |
5eef597e | 384 | size_t optoffset = 0; |
e842803a MB |
385 | int r; |
386 | ||
387 | assert(server); | |
388 | assert(ret); | |
389 | assert(_optoffset); | |
390 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)); | |
391 | ||
392 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen); | |
393 | if (!packet) | |
394 | return -ENOMEM; | |
395 | ||
5eef597e MP |
396 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
397 | be32toh(req->message->xid), type, ARPHRD_ETHER, | |
398 | req->max_optlen, &optoffset); | |
e842803a MB |
399 | if (r < 0) |
400 | return r; | |
401 | ||
402 | packet->dhcp.flags = req->message->flags; | |
403 | packet->dhcp.giaddr = req->message->giaddr; | |
404 | memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN); | |
405 | ||
406 | *_optoffset = optoffset; | |
b012e921 | 407 | *ret = TAKE_PTR(packet); |
e842803a MB |
408 | |
409 | return 0; | |
410 | } | |
411 | ||
5eef597e MP |
412 | static int server_send_offer(sd_dhcp_server *server, DHCPRequest *req, |
413 | be32_t address) { | |
e842803a MB |
414 | _cleanup_free_ DHCPPacket *packet = NULL; |
415 | size_t offset; | |
416 | be32_t lease_time; | |
417 | int r; | |
418 | ||
419 | r = server_message_init(server, &packet, DHCP_OFFER, &offset, req); | |
420 | if (r < 0) | |
421 | return r; | |
422 | ||
423 | packet->dhcp.yiaddr = address; | |
424 | ||
425 | lease_time = htobe32(req->lifetime); | |
426 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
4c89c718 | 427 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
5eef597e MP |
428 | &lease_time); |
429 | if (r < 0) | |
430 | return r; | |
431 | ||
432 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
4c89c718 | 433 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
5eef597e MP |
434 | if (r < 0) |
435 | return r; | |
436 | ||
aa27b158 MP |
437 | if (server->emit_router) { |
438 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
439 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
440 | if (r < 0) | |
441 | return r; | |
442 | } | |
e842803a MB |
443 | |
444 | r = dhcp_server_send_packet(server, req, packet, DHCP_OFFER, offset); | |
445 | if (r < 0) | |
446 | return r; | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
5eef597e MP |
451 | static int server_send_ack(sd_dhcp_server *server, DHCPRequest *req, |
452 | be32_t address) { | |
e842803a MB |
453 | _cleanup_free_ DHCPPacket *packet = NULL; |
454 | size_t offset; | |
455 | be32_t lease_time; | |
456 | int r; | |
457 | ||
458 | r = server_message_init(server, &packet, DHCP_ACK, &offset, req); | |
459 | if (r < 0) | |
460 | return r; | |
461 | ||
462 | packet->dhcp.yiaddr = address; | |
463 | ||
464 | lease_time = htobe32(req->lifetime); | |
465 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
4c89c718 | 466 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
5eef597e MP |
467 | &lease_time); |
468 | if (r < 0) | |
469 | return r; | |
470 | ||
471 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
4c89c718 | 472 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
5eef597e MP |
473 | if (r < 0) |
474 | return r; | |
475 | ||
aa27b158 MP |
476 | if (server->emit_router) { |
477 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
478 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
479 | if (r < 0) | |
480 | return r; | |
481 | } | |
e842803a | 482 | |
d9dfd233 MP |
483 | if (server->n_dns > 0) { |
484 | r = dhcp_option_append( | |
485 | &packet->dhcp, req->max_optlen, &offset, 0, | |
4c89c718 | 486 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, |
d9dfd233 MP |
487 | sizeof(struct in_addr) * server->n_dns, server->dns); |
488 | if (r < 0) | |
489 | return r; | |
490 | } | |
491 | ||
492 | if (server->n_ntp > 0) { | |
493 | r = dhcp_option_append( | |
494 | &packet->dhcp, req->max_optlen, &offset, 0, | |
4c89c718 | 495 | SD_DHCP_OPTION_NTP_SERVER, |
d9dfd233 MP |
496 | sizeof(struct in_addr) * server->n_ntp, server->ntp); |
497 | if (r < 0) | |
498 | return r; | |
499 | } | |
500 | ||
501 | if (server->timezone) { | |
502 | r = dhcp_option_append( | |
503 | &packet->dhcp, req->max_optlen, &offset, 0, | |
4c89c718 | 504 | SD_DHCP_OPTION_NEW_TZDB_TIMEZONE, |
d9dfd233 MP |
505 | strlen(server->timezone), server->timezone); |
506 | if (r < 0) | |
507 | return r; | |
508 | } | |
509 | ||
e842803a MB |
510 | r = dhcp_server_send_packet(server, req, packet, DHCP_ACK, offset); |
511 | if (r < 0) | |
512 | return r; | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { | |
518 | _cleanup_free_ DHCPPacket *packet = NULL; | |
519 | size_t offset; | |
520 | int r; | |
521 | ||
522 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); | |
523 | if (r < 0) | |
524 | return r; | |
525 | ||
d9dfd233 | 526 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
e842803a MB |
527 | } |
528 | ||
5eef597e MP |
529 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
530 | be32_t gateway, uint8_t chaddr[]) { | |
531 | _cleanup_free_ DHCPPacket *packet = NULL; | |
532 | size_t optoffset = 0; | |
533 | int r; | |
534 | ||
535 | assert(server); | |
536 | assert(address != INADDR_ANY); | |
537 | assert(chaddr); | |
538 | ||
539 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
540 | if (!packet) | |
541 | return -ENOMEM; | |
542 | ||
543 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
544 | DHCP_FORCERENEW, ARPHRD_ETHER, | |
545 | DHCP_MIN_OPTIONS_SIZE, &optoffset); | |
546 | if (r < 0) | |
547 | return r; | |
548 | ||
549 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
4c89c718 | 550 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL); |
5eef597e MP |
551 | if (r < 0) |
552 | return r; | |
553 | ||
554 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); | |
555 | ||
aa27b158 MP |
556 | r = dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, |
557 | &packet->dhcp, | |
5eef597e MP |
558 | sizeof(DHCPMessage) + optoffset); |
559 | if (r < 0) | |
560 | return r; | |
561 | ||
562 | return 0; | |
563 | } | |
564 | ||
d9dfd233 MP |
565 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
566 | DHCPRequest *req = userdata; | |
e842803a MB |
567 | |
568 | assert(req); | |
569 | ||
570 | switch(code) { | |
4c89c718 | 571 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
e842803a | 572 | if (len == 4) |
5a920b42 | 573 | req->lifetime = unaligned_read_be32(option); |
e842803a MB |
574 | |
575 | break; | |
4c89c718 | 576 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
e842803a | 577 | if (len == 4) |
5a920b42 | 578 | memcpy(&req->requested_ip, option, sizeof(be32_t)); |
e842803a MB |
579 | |
580 | break; | |
4c89c718 | 581 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
e842803a | 582 | if (len == 4) |
5a920b42 | 583 | memcpy(&req->server_id, option, sizeof(be32_t)); |
e842803a MB |
584 | |
585 | break; | |
4c89c718 | 586 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
e842803a MB |
587 | if (len >= 2) { |
588 | uint8_t *data; | |
589 | ||
590 | data = memdup(option, len); | |
591 | if (!data) | |
592 | return -ENOMEM; | |
593 | ||
594 | free(req->client_id.data); | |
595 | req->client_id.data = data; | |
596 | req->client_id.length = len; | |
597 | } | |
598 | ||
599 | break; | |
4c89c718 | 600 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
5a920b42 MP |
601 | |
602 | if (len == 2 && unaligned_read_be16(option) >= sizeof(DHCPPacket)) | |
603 | req->max_optlen = unaligned_read_be16(option) - sizeof(DHCPPacket); | |
e842803a MB |
604 | |
605 | break; | |
606 | } | |
607 | ||
608 | return 0; | |
609 | } | |
610 | ||
611 | static void dhcp_request_free(DHCPRequest *req) { | |
612 | if (!req) | |
613 | return; | |
614 | ||
615 | free(req->client_id.data); | |
616 | free(req); | |
617 | } | |
618 | ||
619 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
e842803a | 620 | |
d9dfd233 | 621 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
e842803a MB |
622 | assert(req); |
623 | assert(message); | |
624 | ||
625 | req->message = message; | |
626 | ||
e735f4d4 | 627 | /* set client id based on MAC address if client did not send an explicit |
5eef597e | 628 | one */ |
e842803a | 629 | if (!req->client_id.data) { |
d9dfd233 | 630 | void *data; |
e842803a | 631 | |
d9dfd233 | 632 | data = malloc0(ETH_ALEN + 1); |
e842803a MB |
633 | if (!data) |
634 | return -ENOMEM; | |
635 | ||
d9dfd233 MP |
636 | ((uint8_t*) data)[0] = 0x01; |
637 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN); | |
638 | ||
e842803a MB |
639 | req->client_id.length = ETH_ALEN + 1; |
640 | req->client_id.data = data; | |
e842803a MB |
641 | } |
642 | ||
643 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) | |
644 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
645 | ||
d9dfd233 MP |
646 | if (req->lifetime <= 0) |
647 | req->lifetime = MAX(1ULL, server->default_lease_time); | |
648 | ||
649 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
650 | req->lifetime = server->max_lease_time; | |
e842803a MB |
651 | |
652 | return 0; | |
653 | } | |
654 | ||
655 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { | |
656 | assert(server); | |
657 | ||
658 | if (!server->pool_size) | |
659 | return -EINVAL; | |
660 | ||
d9dfd233 MP |
661 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
662 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
663 | return -ERANGE; | |
e842803a | 664 | |
d9dfd233 | 665 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
e842803a MB |
666 | } |
667 | ||
d9dfd233 MP |
668 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
669 | ||
e842803a MB |
670 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, |
671 | size_t length) { | |
b012e921 | 672 | _cleanup_(dhcp_request_freep) DHCPRequest *req = NULL; |
4c89c718 | 673 | _cleanup_free_ char *error_message = NULL; |
e842803a MB |
674 | DHCPLease *existing_lease; |
675 | int type, r; | |
676 | ||
677 | assert(server); | |
678 | assert(message); | |
679 | ||
680 | if (message->op != BOOTREQUEST || | |
681 | message->htype != ARPHRD_ETHER || | |
682 | message->hlen != ETHER_ADDR_LEN) | |
683 | return 0; | |
684 | ||
685 | req = new0(DHCPRequest, 1); | |
686 | if (!req) | |
687 | return -ENOMEM; | |
688 | ||
4c89c718 | 689 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
e842803a MB |
690 | if (type < 0) |
691 | return 0; | |
692 | ||
d9dfd233 | 693 | r = ensure_sane_request(server, req, message); |
e842803a MB |
694 | if (r < 0) |
695 | /* this only fails on critical errors */ | |
696 | return r; | |
697 | ||
5eef597e MP |
698 | existing_lease = hashmap_get(server->leases_by_client_id, |
699 | &req->client_id); | |
e842803a MB |
700 | |
701 | switch(type) { | |
d9dfd233 MP |
702 | |
703 | case DHCP_DISCOVER: { | |
e842803a MB |
704 | be32_t address = INADDR_ANY; |
705 | unsigned i; | |
706 | ||
707 | log_dhcp_server(server, "DISCOVER (0x%x)", | |
708 | be32toh(req->message->xid)); | |
709 | ||
710 | if (!server->pool_size) | |
711 | /* no pool allocated */ | |
712 | return 0; | |
713 | ||
714 | /* for now pick a random free address from the pool */ | |
715 | if (existing_lease) | |
716 | address = existing_lease->address; | |
717 | else { | |
6300502b MP |
718 | struct siphash state; |
719 | uint64_t hash; | |
d9dfd233 MP |
720 | uint32_t next_offer; |
721 | ||
722 | /* even with no persistence of leases, we try to offer the same client | |
723 | the same IP address. we do this by using the hash of the client id | |
724 | as the offset into the pool of leases when finding the next free one */ | |
725 | ||
6300502b MP |
726 | siphash24_init(&state, HASH_KEY.bytes); |
727 | client_id_hash_func(&req->client_id, &state); | |
db2df898 | 728 | hash = htole64(siphash24_finalize(&state)); |
6300502b | 729 | next_offer = hash % server->pool_size; |
d9dfd233 | 730 | |
e842803a | 731 | for (i = 0; i < server->pool_size; i++) { |
d9dfd233 MP |
732 | if (!server->bound_leases[next_offer]) { |
733 | address = server->subnet | htobe32(server->pool_offset + next_offer); | |
e842803a | 734 | break; |
b012e921 MB |
735 | } |
736 | ||
737 | next_offer = (next_offer + 1) % server->pool_size; | |
e842803a MB |
738 | } |
739 | } | |
740 | ||
741 | if (address == INADDR_ANY) | |
742 | /* no free addresses left */ | |
743 | return 0; | |
744 | ||
745 | r = server_send_offer(server, req, address); | |
b012e921 | 746 | if (r < 0) |
e842803a | 747 | /* this only fails on critical errors */ |
b012e921 | 748 | return log_dhcp_server_errno(server, r, "Could not send offer: %m"); |
e842803a | 749 | |
b012e921 MB |
750 | log_dhcp_server(server, "OFFER (0x%x)", be32toh(req->message->xid)); |
751 | return DHCP_OFFER; | |
e842803a MB |
752 | } |
753 | case DHCP_DECLINE: | |
4c89c718 | 754 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message)); |
e842803a MB |
755 | |
756 | /* TODO: make sure we don't offer this address again */ | |
757 | ||
758 | return 1; | |
759 | ||
d9dfd233 | 760 | case DHCP_REQUEST: { |
e842803a MB |
761 | be32_t address; |
762 | bool init_reboot = false; | |
763 | int pool_offset; | |
764 | ||
765 | /* see RFC 2131, section 4.3.2 */ | |
766 | ||
767 | if (req->server_id) { | |
768 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", | |
769 | be32toh(req->message->xid)); | |
770 | ||
771 | /* SELECTING */ | |
772 | if (req->server_id != server->address) | |
773 | /* client did not pick us */ | |
774 | return 0; | |
775 | ||
776 | if (req->message->ciaddr) | |
777 | /* this MUST be zero */ | |
778 | return 0; | |
779 | ||
780 | if (!req->requested_ip) | |
781 | /* this must be filled in with the yiaddr | |
782 | from the chosen OFFER */ | |
783 | return 0; | |
784 | ||
785 | address = req->requested_ip; | |
786 | } else if (req->requested_ip) { | |
787 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", | |
788 | be32toh(req->message->xid)); | |
789 | ||
790 | /* INIT-REBOOT */ | |
791 | if (req->message->ciaddr) | |
792 | /* this MUST be zero */ | |
793 | return 0; | |
794 | ||
795 | /* TODO: check more carefully if IP is correct */ | |
796 | address = req->requested_ip; | |
797 | init_reboot = true; | |
798 | } else { | |
799 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
800 | be32toh(req->message->xid)); | |
801 | ||
802 | /* REBINDING / RENEWING */ | |
803 | if (!req->message->ciaddr) | |
804 | /* this MUST be filled in with clients IP address */ | |
805 | return 0; | |
806 | ||
807 | address = req->message->ciaddr; | |
808 | } | |
809 | ||
810 | pool_offset = get_pool_offset(server, address); | |
811 | ||
812 | /* verify that the requested address is from the pool, and either | |
813 | owned by the current client or free */ | |
814 | if (pool_offset >= 0 && | |
815 | server->bound_leases[pool_offset] == existing_lease) { | |
816 | DHCPLease *lease; | |
e3bff60a | 817 | usec_t time_now = 0; |
e842803a MB |
818 | |
819 | if (!existing_lease) { | |
820 | lease = new0(DHCPLease, 1); | |
81c58355 MB |
821 | if (!lease) |
822 | return -ENOMEM; | |
2897b343 | 823 | lease->address = address; |
e842803a MB |
824 | lease->client_id.data = memdup(req->client_id.data, |
825 | req->client_id.length); | |
826 | if (!lease->client_id.data) { | |
827 | free(lease); | |
828 | return -ENOMEM; | |
829 | } | |
830 | lease->client_id.length = req->client_id.length; | |
5eef597e MP |
831 | memcpy(&lease->chaddr, &req->message->chaddr, |
832 | ETH_ALEN); | |
833 | lease->gateway = req->message->giaddr; | |
e842803a MB |
834 | } else |
835 | lease = existing_lease; | |
836 | ||
5eef597e MP |
837 | r = sd_event_now(server->event, |
838 | clock_boottime_or_monotonic(), | |
839 | &time_now); | |
13d276d0 MP |
840 | if (r < 0) { |
841 | if (!existing_lease) | |
842 | dhcp_lease_free(lease); | |
843 | return r; | |
844 | } | |
845 | ||
e842803a MB |
846 | lease->expiration = req->lifetime * USEC_PER_SEC + time_now; |
847 | ||
848 | r = server_send_ack(server, req, address); | |
849 | if (r < 0) { | |
850 | /* this only fails on critical errors */ | |
b012e921 | 851 | log_dhcp_server_errno(server, r, "Could not send ack: %m"); |
e842803a MB |
852 | |
853 | if (!existing_lease) | |
854 | dhcp_lease_free(lease); | |
855 | ||
856 | return r; | |
857 | } else { | |
858 | log_dhcp_server(server, "ACK (0x%x)", | |
859 | be32toh(req->message->xid)); | |
860 | ||
861 | server->bound_leases[pool_offset] = lease; | |
5eef597e MP |
862 | hashmap_put(server->leases_by_client_id, |
863 | &lease->client_id, lease); | |
e842803a MB |
864 | |
865 | return DHCP_ACK; | |
866 | } | |
b012e921 | 867 | |
e842803a MB |
868 | } else if (init_reboot) { |
869 | r = server_send_nak(server, req); | |
b012e921 | 870 | if (r < 0) |
e842803a | 871 | /* this only fails on critical errors */ |
b012e921 MB |
872 | return log_dhcp_server_errno(server, r, "Could not send nak: %m"); |
873 | ||
874 | log_dhcp_server(server, "NAK (0x%x)", be32toh(req->message->xid)); | |
875 | return DHCP_NAK; | |
e842803a MB |
876 | } |
877 | ||
878 | break; | |
879 | } | |
d9dfd233 | 880 | |
e842803a MB |
881 | case DHCP_RELEASE: { |
882 | int pool_offset; | |
883 | ||
884 | log_dhcp_server(server, "RELEASE (0x%x)", | |
885 | be32toh(req->message->xid)); | |
886 | ||
887 | if (!existing_lease) | |
888 | return 0; | |
889 | ||
890 | if (existing_lease->address != req->message->ciaddr) | |
891 | return 0; | |
892 | ||
893 | pool_offset = get_pool_offset(server, req->message->ciaddr); | |
894 | if (pool_offset < 0) | |
895 | return 0; | |
896 | ||
897 | if (server->bound_leases[pool_offset] == existing_lease) { | |
898 | server->bound_leases[pool_offset] = NULL; | |
899 | hashmap_remove(server->leases_by_client_id, existing_lease); | |
900 | dhcp_lease_free(existing_lease); | |
b012e921 | 901 | } |
e842803a | 902 | |
b012e921 MB |
903 | return 0; |
904 | }} | |
e842803a MB |
905 | |
906 | return 0; | |
907 | } | |
908 | ||
909 | static int server_receive_message(sd_event_source *s, int fd, | |
910 | uint32_t revents, void *userdata) { | |
911 | _cleanup_free_ DHCPMessage *message = NULL; | |
912 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))]; | |
913 | sd_dhcp_server *server = userdata; | |
914 | struct iovec iov = {}; | |
915 | struct msghdr msg = { | |
916 | .msg_iov = &iov, | |
917 | .msg_iovlen = 1, | |
918 | .msg_control = cmsgbuf, | |
919 | .msg_controllen = sizeof(cmsgbuf), | |
920 | }; | |
921 | struct cmsghdr *cmsg; | |
aa27b158 | 922 | ssize_t buflen, len; |
b012e921 | 923 | int r; |
e842803a MB |
924 | |
925 | assert(server); | |
926 | ||
aa27b158 MP |
927 | buflen = next_datagram_size_fd(fd); |
928 | if (buflen < 0) | |
929 | return buflen; | |
e842803a | 930 | |
4c89c718 | 931 | message = malloc(buflen); |
e842803a MB |
932 | if (!message) |
933 | return -ENOMEM; | |
934 | ||
6e866b33 | 935 | iov = IOVEC_MAKE(message, buflen); |
e842803a MB |
936 | |
937 | len = recvmsg(fd, &msg, 0); | |
4c89c718 | 938 | if (len < 0) { |
f5e65279 | 939 | if (IN_SET(errno, EAGAIN, EINTR)) |
4c89c718 MP |
940 | return 0; |
941 | ||
942 | return -errno; | |
b012e921 MB |
943 | } |
944 | if ((size_t)len < sizeof(DHCPMessage)) | |
e842803a MB |
945 | return 0; |
946 | ||
86f210e9 | 947 | CMSG_FOREACH(cmsg, &msg) { |
e842803a MB |
948 | if (cmsg->cmsg_level == IPPROTO_IP && |
949 | cmsg->cmsg_type == IP_PKTINFO && | |
950 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) { | |
951 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg); | |
952 | ||
5eef597e MP |
953 | /* TODO figure out if this can be done as a filter on |
954 | * the socket, like for IPv6 */ | |
d9dfd233 | 955 | if (server->ifindex != info->ipi_ifindex) |
e842803a MB |
956 | return 0; |
957 | ||
958 | break; | |
959 | } | |
960 | } | |
961 | ||
b012e921 MB |
962 | r = dhcp_server_handle_message(server, message, (size_t) len); |
963 | if (r < 0) | |
964 | log_dhcp_server_errno(server, r, "Couldn't process incoming message: %m"); | |
965 | ||
966 | return 0; | |
e842803a MB |
967 | } |
968 | ||
969 | int sd_dhcp_server_start(sd_dhcp_server *server) { | |
970 | int r; | |
971 | ||
972 | assert_return(server, -EINVAL); | |
973 | assert_return(server->event, -EINVAL); | |
974 | assert_return(!server->receive_message, -EBUSY); | |
b012e921 MB |
975 | assert_return(server->fd_raw < 0, -EBUSY); |
976 | assert_return(server->fd < 0, -EBUSY); | |
e842803a MB |
977 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH); |
978 | ||
6e866b33 | 979 | r = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0); |
e842803a MB |
980 | if (r < 0) { |
981 | r = -errno; | |
982 | sd_dhcp_server_stop(server); | |
983 | return r; | |
984 | } | |
985 | server->fd_raw = r; | |
986 | ||
2897b343 | 987 | r = dhcp_network_bind_udp_socket(server->ifindex, INADDR_ANY, DHCP_PORT_SERVER); |
e842803a MB |
988 | if (r < 0) { |
989 | sd_dhcp_server_stop(server); | |
990 | return r; | |
991 | } | |
992 | server->fd = r; | |
993 | ||
994 | r = sd_event_add_io(server->event, &server->receive_message, | |
995 | server->fd, EPOLLIN, | |
996 | server_receive_message, server); | |
997 | if (r < 0) { | |
998 | sd_dhcp_server_stop(server); | |
999 | return r; | |
1000 | } | |
1001 | ||
1002 | r = sd_event_source_set_priority(server->receive_message, | |
1003 | server->event_priority); | |
1004 | if (r < 0) { | |
1005 | sd_dhcp_server_stop(server); | |
1006 | return r; | |
1007 | } | |
1008 | ||
1009 | log_dhcp_server(server, "STARTED"); | |
1010 | ||
1011 | return 0; | |
1012 | } | |
5eef597e MP |
1013 | |
1014 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { | |
1015 | unsigned i; | |
1016 | int r = 0; | |
1017 | ||
1018 | assert_return(server, -EINVAL); | |
1019 | assert(server->bound_leases); | |
1020 | ||
1021 | for (i = 0; i < server->pool_size; i++) { | |
1022 | DHCPLease *lease = server->bound_leases[i]; | |
1023 | ||
d9dfd233 | 1024 | if (!lease || lease == &server->invalid_lease) |
5eef597e MP |
1025 | continue; |
1026 | ||
1027 | r = server_send_forcerenew(server, lease->address, | |
1028 | lease->gateway, | |
1029 | lease->chaddr); | |
1030 | if (r < 0) | |
1031 | return r; | |
b012e921 MB |
1032 | |
1033 | log_dhcp_server(server, "FORCERENEW"); | |
5eef597e MP |
1034 | } |
1035 | ||
1036 | return r; | |
1037 | } | |
d9dfd233 MP |
1038 | |
1039 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { | |
1040 | int r; | |
1041 | ||
1042 | assert_return(server, -EINVAL); | |
b012e921 | 1043 | assert_return(timezone_is_valid(tz, LOG_DEBUG), -EINVAL); |
d9dfd233 MP |
1044 | |
1045 | if (streq_ptr(tz, server->timezone)) | |
1046 | return 0; | |
1047 | ||
1048 | r = free_and_strdup(&server->timezone, tz); | |
1049 | if (r < 0) | |
1050 | return r; | |
1051 | ||
1052 | return 1; | |
1053 | } | |
1054 | ||
1055 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1056 | assert_return(server, -EINVAL); | |
1057 | ||
1058 | if (t == server->max_lease_time) | |
1059 | return 0; | |
1060 | ||
1061 | server->max_lease_time = t; | |
1062 | return 1; | |
1063 | } | |
1064 | ||
1065 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1066 | assert_return(server, -EINVAL); | |
1067 | ||
1068 | if (t == server->default_lease_time) | |
1069 | return 0; | |
1070 | ||
1071 | server->default_lease_time = t; | |
1072 | return 1; | |
1073 | } | |
1074 | ||
1075 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], unsigned n) { | |
1076 | assert_return(server, -EINVAL); | |
1077 | assert_return(dns || n <= 0, -EINVAL); | |
1078 | ||
1079 | if (server->n_dns == n && | |
1080 | memcmp(server->dns, dns, sizeof(struct in_addr) * n) == 0) | |
1081 | return 0; | |
1082 | ||
1083 | if (n <= 0) { | |
1084 | server->dns = mfree(server->dns); | |
1085 | server->n_dns = 0; | |
1086 | } else { | |
1087 | struct in_addr *c; | |
1088 | ||
1089 | c = newdup(struct in_addr, dns, n); | |
1090 | if (!c) | |
1091 | return -ENOMEM; | |
1092 | ||
1093 | free(server->dns); | |
1094 | server->dns = c; | |
1095 | server->n_dns = n; | |
1096 | } | |
1097 | ||
1098 | return 1; | |
1099 | } | |
1100 | ||
1101 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], unsigned n) { | |
1102 | assert_return(server, -EINVAL); | |
1103 | assert_return(ntp || n <= 0, -EINVAL); | |
1104 | ||
1105 | if (server->n_ntp == n && | |
1106 | memcmp(server->ntp, ntp, sizeof(struct in_addr) * n) == 0) | |
1107 | return 0; | |
1108 | ||
1109 | if (n <= 0) { | |
1110 | server->ntp = mfree(server->ntp); | |
1111 | server->n_ntp = 0; | |
1112 | } else { | |
1113 | struct in_addr *c; | |
1114 | ||
1115 | c = newdup(struct in_addr, ntp, n); | |
1116 | if (!c) | |
1117 | return -ENOMEM; | |
1118 | ||
1119 | free(server->ntp); | |
1120 | server->ntp = c; | |
1121 | server->n_ntp = n; | |
1122 | } | |
1123 | ||
1124 | return 1; | |
1125 | } | |
aa27b158 MP |
1126 | |
1127 | int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled) { | |
1128 | assert_return(server, -EINVAL); | |
1129 | ||
1130 | if (enabled == server->emit_router) | |
1131 | return 0; | |
1132 | ||
1133 | server->emit_router = enabled; | |
1134 | ||
1135 | return 1; | |
1136 | } |