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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b44cd882 TG |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright (C) 2013 Intel Corporation. All rights reserved. | |
6 | Copyright (C) 2014 Tom Gundersen | |
b44cd882 TG |
7 | ***/ |
8 | ||
ff734080 TG |
9 | #include <sys/ioctl.h> |
10 | ||
b44cd882 | 11 | #include "sd-dhcp-server.h" |
07630cea | 12 | |
b5efdb8a | 13 | #include "alloc-util.h" |
ff734080 | 14 | #include "dhcp-internal.h" |
07630cea | 15 | #include "dhcp-server-internal.h" |
3ffd4af2 | 16 | #include "fd-util.h" |
07630cea | 17 | #include "in-addr-util.h" |
dccca82b | 18 | #include "sd-id128.h" |
07630cea LP |
19 | #include "siphash24.h" |
20 | #include "string-util.h" | |
9ae84244 | 21 | #include "unaligned.h" |
b44cd882 | 22 | |
586ac6f7 LP |
23 | #define DHCP_DEFAULT_LEASE_TIME_USEC USEC_PER_HOUR |
24 | #define DHCP_MAX_LEASE_TIME_USEC (USEC_PER_HOUR*12) | |
4dc35568 | 25 | |
45a9eac9 RM |
26 | static void dhcp_lease_free(DHCPLease *lease) { |
27 | if (!lease) | |
28 | return; | |
29 | ||
30 | free(lease->client_id.data); | |
31 | free(lease); | |
32 | } | |
33 | ||
99634696 TG |
34 | /* configures the server's address and subnet, and optionally the pool's size and offset into the subnet |
35 | * the whole pool must fit into the subnet, and may not contain the first (any) nor last (broadcast) address | |
36 | * moreover, the server's own address may be in the pool, and is in that case reserved in order not to | |
37 | * accidentally hand it out */ | |
38 | int sd_dhcp_server_configure_pool(sd_dhcp_server *server, struct in_addr *address, unsigned char prefixlen, uint32_t offset, uint32_t size) { | |
39 | struct in_addr netmask_addr; | |
40 | be32_t netmask; | |
41 | uint32_t server_off, broadcast_off, size_max; | |
42 | ||
2dead812 TG |
43 | assert_return(server, -EINVAL); |
44 | assert_return(address, -EINVAL); | |
99634696 TG |
45 | assert_return(address->s_addr != INADDR_ANY, -EINVAL); |
46 | assert_return(prefixlen <= 32, -ERANGE); | |
99634696 | 47 | |
5a941f5f | 48 | assert_se(in4_addr_prefixlen_to_netmask(&netmask_addr, prefixlen)); |
99634696 TG |
49 | netmask = netmask_addr.s_addr; |
50 | ||
51 | server_off = be32toh(address->s_addr & ~netmask); | |
52 | broadcast_off = be32toh(~netmask); | |
53 | ||
54 | /* the server address cannot be the subnet address */ | |
55 | assert_return(server_off != 0, -ERANGE); | |
56 | ||
57 | /* nor the broadcast address */ | |
58 | assert_return(server_off != broadcast_off, -ERANGE); | |
59 | ||
60 | /* 0 offset means we should set a default, we skip the first (subnet) address | |
61 | and take the next one */ | |
62 | if (offset == 0) | |
63 | offset = 1; | |
64 | ||
65 | size_max = (broadcast_off + 1) /* the number of addresses in the subnet */ | |
66 | - offset /* exclude the addresses before the offset */ | |
67 | - 1; /* exclude the last (broadcast) address */ | |
68 | ||
69 | /* The pool must contain at least one address */ | |
70 | assert_return(size_max >= 1, -ERANGE); | |
71 | ||
72 | if (size != 0) | |
73 | assert_return(size <= size_max, -ERANGE); | |
74 | else | |
75 | size = size_max; | |
87322b3a | 76 | |
45a9eac9 | 77 | if (server->address != address->s_addr || server->netmask != netmask || server->pool_size != size || server->pool_offset != offset) { |
45a9eac9 RM |
78 | |
79 | free(server->bound_leases); | |
80 | server->bound_leases = new0(DHCPLease*, size); | |
81 | if (!server->bound_leases) | |
82 | return -ENOMEM; | |
2dead812 | 83 | |
45a9eac9 RM |
84 | server->pool_offset = offset; |
85 | server->pool_size = size; | |
2dead812 | 86 | |
45a9eac9 RM |
87 | server->address = address->s_addr; |
88 | server->netmask = netmask; | |
89 | server->subnet = address->s_addr & netmask; | |
99634696 | 90 | |
45a9eac9 RM |
91 | if (server_off >= offset && server_off - offset < size) |
92 | server->bound_leases[server_off - offset] = &server->invalid_lease; | |
93 | ||
94 | /* Drop any leases associated with the old address range */ | |
224b0e7a | 95 | hashmap_clear_with_destructor(server->leases_by_client_id, dhcp_lease_free); |
45a9eac9 | 96 | } |
20af7091 TG |
97 | |
98 | return 0; | |
99 | } | |
100 | ||
04c01369 | 101 | int sd_dhcp_server_is_running(sd_dhcp_server *server) { |
75677581 | 102 | assert_return(server, false); |
7c16313f TG |
103 | |
104 | return !!server->receive_message; | |
105 | } | |
106 | ||
b44cd882 | 107 | sd_dhcp_server *sd_dhcp_server_ref(sd_dhcp_server *server) { |
3733eec3 LP |
108 | |
109 | if (!server) | |
110 | return NULL; | |
111 | ||
112 | assert(server->n_ref >= 1); | |
113 | server->n_ref++; | |
b44cd882 TG |
114 | |
115 | return server; | |
116 | } | |
117 | ||
b826ab58 | 118 | void client_id_hash_func(const void *p, struct siphash *state) { |
87322b3a TG |
119 | const DHCPClientId *id = p; |
120 | ||
121 | assert(id); | |
122 | assert(id->length); | |
123 | assert(id->data); | |
124 | ||
1e2527a6 | 125 | siphash24_compress(&id->length, sizeof(id->length), state); |
b826ab58 | 126 | siphash24_compress(id->data, id->length, state); |
87322b3a TG |
127 | } |
128 | ||
129 | int client_id_compare_func(const void *_a, const void *_b) { | |
130 | const DHCPClientId *a, *b; | |
131 | ||
132 | a = _a; | |
133 | b = _b; | |
134 | ||
135 | assert(!a->length || a->data); | |
136 | assert(!b->length || b->data); | |
137 | ||
138 | if (a->length != b->length) | |
139 | return a->length < b->length ? -1 : 1; | |
140 | ||
141 | return memcmp(a->data, b->data, a->length); | |
142 | } | |
143 | ||
d5099efc MS |
144 | static const struct hash_ops client_id_hash_ops = { |
145 | .hash = client_id_hash_func, | |
146 | .compare = client_id_compare_func | |
147 | }; | |
148 | ||
b44cd882 | 149 | sd_dhcp_server *sd_dhcp_server_unref(sd_dhcp_server *server) { |
3bdace9b | 150 | DHCPLease *lease; |
87322b3a | 151 | |
3bdace9b LP |
152 | if (!server) |
153 | return NULL; | |
b44cd882 | 154 | |
3733eec3 LP |
155 | assert(server->n_ref >= 1); |
156 | server->n_ref--; | |
157 | ||
158 | if (server->n_ref > 0) | |
3bdace9b | 159 | return NULL; |
ff734080 | 160 | |
3bdace9b | 161 | log_dhcp_server(server, "UNREF"); |
87322b3a | 162 | |
3bdace9b | 163 | sd_dhcp_server_stop(server); |
87322b3a | 164 | |
3bdace9b LP |
165 | sd_event_unref(server->event); |
166 | ||
8eb9058d | 167 | free(server->timezone); |
1a04db0f LP |
168 | free(server->dns); |
169 | free(server->ntp); | |
8eb9058d | 170 | |
3bdace9b LP |
171 | while ((lease = hashmap_steal_first(server->leases_by_client_id))) |
172 | dhcp_lease_free(lease); | |
173 | hashmap_free(server->leases_by_client_id); | |
174 | ||
175 | free(server->bound_leases); | |
6b430fdb | 176 | return mfree(server); |
b44cd882 TG |
177 | } |
178 | ||
3a864fe4 | 179 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
4afd3348 | 180 | _cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL; |
b44cd882 TG |
181 | |
182 | assert_return(ret, -EINVAL); | |
3a864fe4 | 183 | assert_return(ifindex > 0, -EINVAL); |
b44cd882 TG |
184 | |
185 | server = new0(sd_dhcp_server, 1); | |
186 | if (!server) | |
187 | return -ENOMEM; | |
188 | ||
3733eec3 | 189 | server->n_ref = 1; |
8de4a226 | 190 | server->fd_raw = -1; |
ff734080 | 191 | server->fd = -1; |
20af7091 | 192 | server->address = htobe32(INADDR_ANY); |
59b8f6b6 | 193 | server->netmask = htobe32(INADDR_ANY); |
b3ec603c | 194 | server->ifindex = ifindex; |
357e1b17 | 195 | |
d5099efc | 196 | server->leases_by_client_id = hashmap_new(&client_id_hash_ops); |
357e1b17 LP |
197 | if (!server->leases_by_client_id) |
198 | return -ENOMEM; | |
199 | ||
586ac6f7 LP |
200 | server->default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC); |
201 | server->max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC); | |
b44cd882 | 202 | |
1cc6c93a | 203 | *ret = TAKE_PTR(server); |
b44cd882 TG |
204 | |
205 | return 0; | |
206 | } | |
207 | ||
32d20645 | 208 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int64_t priority) { |
b44cd882 TG |
209 | int r; |
210 | ||
211 | assert_return(server, -EINVAL); | |
212 | assert_return(!server->event, -EBUSY); | |
213 | ||
214 | if (event) | |
215 | server->event = sd_event_ref(event); | |
216 | else { | |
217 | r = sd_event_default(&server->event); | |
218 | if (r < 0) | |
219 | return r; | |
220 | } | |
221 | ||
222 | server->event_priority = priority; | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
228 | assert_return(server, -EINVAL); | |
229 | ||
230 | server->event = sd_event_unref(server->event); | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
236 | assert_return(server, NULL); | |
237 | ||
238 | return server->event; | |
239 | } | |
ff734080 TG |
240 | |
241 | int sd_dhcp_server_stop(sd_dhcp_server *server) { | |
242 | assert_return(server, -EINVAL); | |
243 | ||
244 | server->receive_message = | |
245 | sd_event_source_unref(server->receive_message); | |
246 | ||
8de4a226 | 247 | server->fd_raw = safe_close(server->fd_raw); |
ff734080 TG |
248 | server->fd = safe_close(server->fd); |
249 | ||
250 | log_dhcp_server(server, "STOPPED"); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
a6f1e036 TG |
255 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
256 | DHCPPacket *packet, size_t len) { | |
969b009d TG |
257 | union sockaddr_union link = { |
258 | .ll.sll_family = AF_PACKET, | |
8e38570e | 259 | .ll.sll_protocol = htobe16(ETH_P_IP), |
b3ec603c | 260 | .ll.sll_ifindex = server->ifindex, |
969b009d TG |
261 | .ll.sll_halen = ETH_ALEN, |
262 | }; | |
969b009d TG |
263 | |
264 | assert(server); | |
b3ec603c | 265 | assert(server->ifindex > 0); |
969b009d TG |
266 | assert(server->address); |
267 | assert(packet); | |
268 | assert(len > sizeof(DHCPPacket)); | |
269 | ||
270 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN); | |
271 | ||
272 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, | |
a6f1e036 TG |
273 | packet->dhcp.yiaddr, |
274 | DHCP_PORT_CLIENT, len); | |
969b009d | 275 | |
b3ec603c | 276 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
969b009d TG |
277 | } |
278 | ||
279 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
8eb7b6a5 | 280 | uint16_t destination_port, |
969b009d TG |
281 | DHCPMessage *message, size_t len) { |
282 | union sockaddr_union dest = { | |
283 | .in.sin_family = AF_INET, | |
8eb7b6a5 | 284 | .in.sin_port = htobe16(destination_port), |
969b009d TG |
285 | .in.sin_addr.s_addr = destination, |
286 | }; | |
287 | struct iovec iov = { | |
288 | .iov_base = message, | |
289 | .iov_len = len, | |
290 | }; | |
291 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))] = {}; | |
292 | struct msghdr msg = { | |
293 | .msg_name = &dest, | |
294 | .msg_namelen = sizeof(dest.in), | |
295 | .msg_iov = &iov, | |
296 | .msg_iovlen = 1, | |
297 | .msg_control = cmsgbuf, | |
298 | .msg_controllen = sizeof(cmsgbuf), | |
299 | }; | |
300 | struct cmsghdr *cmsg; | |
301 | struct in_pktinfo *pktinfo; | |
969b009d TG |
302 | |
303 | assert(server); | |
4c9cb12c | 304 | assert(server->fd >= 0); |
969b009d TG |
305 | assert(message); |
306 | assert(len > sizeof(DHCPMessage)); | |
307 | ||
308 | cmsg = CMSG_FIRSTHDR(&msg); | |
309 | assert(cmsg); | |
310 | ||
311 | cmsg->cmsg_level = IPPROTO_IP; | |
312 | cmsg->cmsg_type = IP_PKTINFO; | |
313 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
314 | ||
315 | /* we attach source interface and address info to the message | |
316 | rather than binding the socket. This will be mostly useful | |
317 | when we gain support for arbitrary number of server addresses | |
318 | */ | |
319 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
320 | assert(pktinfo); | |
321 | ||
b3ec603c | 322 | pktinfo->ipi_ifindex = server->ifindex; |
969b009d TG |
323 | pktinfo->ipi_spec_dst.s_addr = server->address; |
324 | ||
0f01c1f9 | 325 | if (sendmsg(server->fd, &msg, 0) < 0) |
969b009d TG |
326 | return -errno; |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | static bool requested_broadcast(DHCPRequest *req) { | |
332 | assert(req); | |
333 | ||
334 | return req->message->flags & htobe16(0x8000); | |
335 | } | |
336 | ||
337 | int dhcp_server_send_packet(sd_dhcp_server *server, | |
338 | DHCPRequest *req, DHCPPacket *packet, | |
339 | int type, size_t optoffset) { | |
340 | be32_t destination = INADDR_ANY; | |
8eb7b6a5 | 341 | uint16_t destination_port = DHCP_PORT_CLIENT; |
969b009d TG |
342 | int r; |
343 | ||
344 | assert(server); | |
345 | assert(req); | |
346 | assert(req->max_optlen); | |
347 | assert(optoffset <= req->max_optlen); | |
348 | assert(packet); | |
349 | ||
350 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 351 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
969b009d TG |
352 | 4, &server->address); |
353 | if (r < 0) | |
354 | return r; | |
355 | ||
356 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 357 | SD_DHCP_OPTION_END, 0, NULL); |
969b009d TG |
358 | if (r < 0) |
359 | return r; | |
360 | ||
361 | /* RFC 2131 Section 4.1 | |
362 | ||
363 | If the ’giaddr’ field in a DHCP message from a client is non-zero, | |
364 | the server sends any return messages to the ’DHCP server’ port on the | |
365 | BOOTP relay agent whose address appears in ’giaddr’. If the ’giaddr’ | |
366 | field is zero and the ’ciaddr’ field is nonzero, then the server | |
367 | unicasts DHCPOFFER and DHCPACK messages to the address in ’ciaddr’. | |
368 | If ’giaddr’ is zero and ’ciaddr’ is zero, and the broadcast bit is | |
369 | set, then the server broadcasts DHCPOFFER and DHCPACK messages to | |
370 | 0xffffffff. If the broadcast bit is not set and ’giaddr’ is zero and | |
371 | ’ciaddr’ is zero, then the server unicasts DHCPOFFER and DHCPACK | |
372 | messages to the client’s hardware address and ’yiaddr’ address. In | |
373 | all cases, when ’giaddr’ is zero, the server broadcasts any DHCPNAK | |
374 | messages to 0xffffffff. | |
375 | ||
376 | Section 4.3.2 | |
377 | ||
378 | If ’giaddr’ is set in the DHCPREQUEST message, the client is on a | |
379 | different subnet. The server MUST set the broadcast bit in the | |
380 | DHCPNAK, so that the relay agent will broadcast the DHCPNAK to the | |
381 | client, because the client may not have a correct network address | |
382 | or subnet mask, and the client may not be answering ARP requests. | |
383 | */ | |
384 | if (req->message->giaddr) { | |
385 | destination = req->message->giaddr; | |
8eb7b6a5 | 386 | destination_port = DHCP_PORT_SERVER; |
969b009d TG |
387 | if (type == DHCP_NAK) |
388 | packet->dhcp.flags = htobe16(0x8000); | |
389 | } else if (req->message->ciaddr && type != DHCP_NAK) | |
390 | destination = req->message->ciaddr; | |
391 | ||
d6bd972d | 392 | if (destination != INADDR_ANY) |
8eb7b6a5 PF |
393 | return dhcp_server_send_udp(server, destination, |
394 | destination_port, &packet->dhcp, | |
969b009d | 395 | sizeof(DHCPMessage) + optoffset); |
d6bd972d | 396 | else if (requested_broadcast(req) || type == DHCP_NAK) |
a6f1e036 | 397 | return dhcp_server_send_udp(server, INADDR_BROADCAST, |
8eb7b6a5 | 398 | destination_port, &packet->dhcp, |
d6bd972d | 399 | sizeof(DHCPMessage) + optoffset); |
969b009d | 400 | else |
a6f1e036 TG |
401 | /* we cannot send UDP packet to specific MAC address when the |
402 | address is not yet configured, so must fall back to raw | |
403 | packets */ | |
969b009d TG |
404 | return dhcp_server_send_unicast_raw(server, packet, |
405 | sizeof(DHCPPacket) + optoffset); | |
406 | } | |
407 | ||
4dc35568 | 408 | static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret, |
a6f1e036 TG |
409 | uint8_t type, size_t *_optoffset, |
410 | DHCPRequest *req) { | |
4dc35568 | 411 | _cleanup_free_ DHCPPacket *packet = NULL; |
1231c4d2 | 412 | size_t optoffset = 0; |
4dc35568 TG |
413 | int r; |
414 | ||
415 | assert(server); | |
416 | assert(ret); | |
417 | assert(_optoffset); | |
bd57b450 | 418 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)); |
4dc35568 TG |
419 | |
420 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen); | |
421 | if (!packet) | |
422 | return -ENOMEM; | |
423 | ||
a6f1e036 | 424 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
76253e73 DW |
425 | be32toh(req->message->xid), type, ARPHRD_ETHER, |
426 | req->max_optlen, &optoffset); | |
4dc35568 TG |
427 | if (r < 0) |
428 | return r; | |
429 | ||
430 | packet->dhcp.flags = req->message->flags; | |
431 | packet->dhcp.giaddr = req->message->giaddr; | |
432 | memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN); | |
433 | ||
434 | *_optoffset = optoffset; | |
1cc6c93a | 435 | *ret = TAKE_PTR(packet); |
4dc35568 TG |
436 | |
437 | return 0; | |
438 | } | |
439 | ||
a6f1e036 TG |
440 | static int server_send_offer(sd_dhcp_server *server, DHCPRequest *req, |
441 | be32_t address) { | |
4dc35568 TG |
442 | _cleanup_free_ DHCPPacket *packet = NULL; |
443 | size_t offset; | |
444 | be32_t lease_time; | |
445 | int r; | |
446 | ||
447 | r = server_message_init(server, &packet, DHCP_OFFER, &offset, req); | |
448 | if (r < 0) | |
449 | return r; | |
450 | ||
2dead812 | 451 | packet->dhcp.yiaddr = address; |
4dc35568 | 452 | |
c7d9ffe6 | 453 | lease_time = htobe32(req->lifetime); |
4dc35568 | 454 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 455 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 456 | &lease_time); |
4dc35568 TG |
457 | if (r < 0) |
458 | return r; | |
459 | ||
59b8f6b6 | 460 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 461 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
462 | if (r < 0) |
463 | return r; | |
464 | ||
77ff6022 CG |
465 | if (server->emit_router) { |
466 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
467 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
468 | if (r < 0) | |
469 | return r; | |
470 | } | |
59b8f6b6 | 471 | |
4dc35568 TG |
472 | r = dhcp_server_send_packet(server, req, packet, DHCP_OFFER, offset); |
473 | if (r < 0) | |
474 | return r; | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
a6f1e036 TG |
479 | static int server_send_ack(sd_dhcp_server *server, DHCPRequest *req, |
480 | be32_t address) { | |
2dead812 TG |
481 | _cleanup_free_ DHCPPacket *packet = NULL; |
482 | size_t offset; | |
483 | be32_t lease_time; | |
484 | int r; | |
485 | ||
486 | r = server_message_init(server, &packet, DHCP_ACK, &offset, req); | |
487 | if (r < 0) | |
488 | return r; | |
489 | ||
490 | packet->dhcp.yiaddr = address; | |
491 | ||
c7d9ffe6 | 492 | lease_time = htobe32(req->lifetime); |
2dead812 | 493 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 494 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 495 | &lease_time); |
2dead812 TG |
496 | if (r < 0) |
497 | return r; | |
498 | ||
59b8f6b6 | 499 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 500 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
501 | if (r < 0) |
502 | return r; | |
503 | ||
77ff6022 CG |
504 | if (server->emit_router) { |
505 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
506 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
507 | if (r < 0) | |
508 | return r; | |
509 | } | |
59b8f6b6 | 510 | |
1a04db0f LP |
511 | if (server->n_dns > 0) { |
512 | r = dhcp_option_append( | |
513 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 514 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, |
1a04db0f LP |
515 | sizeof(struct in_addr) * server->n_dns, server->dns); |
516 | if (r < 0) | |
517 | return r; | |
518 | } | |
519 | ||
520 | if (server->n_ntp > 0) { | |
521 | r = dhcp_option_append( | |
522 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 523 | SD_DHCP_OPTION_NTP_SERVER, |
1a04db0f LP |
524 | sizeof(struct in_addr) * server->n_ntp, server->ntp); |
525 | if (r < 0) | |
526 | return r; | |
527 | } | |
528 | ||
8eb9058d LP |
529 | if (server->timezone) { |
530 | r = dhcp_option_append( | |
531 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 532 | SD_DHCP_OPTION_NEW_TZDB_TIMEZONE, |
8eb9058d LP |
533 | strlen(server->timezone), server->timezone); |
534 | if (r < 0) | |
535 | return r; | |
536 | } | |
537 | ||
2dead812 TG |
538 | r = dhcp_server_send_packet(server, req, packet, DHCP_ACK, offset); |
539 | if (r < 0) | |
540 | return r; | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
bd57b450 TG |
545 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { |
546 | _cleanup_free_ DHCPPacket *packet = NULL; | |
547 | size_t offset; | |
548 | int r; | |
549 | ||
550 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); | |
551 | if (r < 0) | |
552 | return r; | |
553 | ||
b3ec603c | 554 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
bd57b450 TG |
555 | } |
556 | ||
a6f1e036 TG |
557 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
558 | be32_t gateway, uint8_t chaddr[]) { | |
52750344 TG |
559 | _cleanup_free_ DHCPPacket *packet = NULL; |
560 | size_t optoffset = 0; | |
561 | int r; | |
562 | ||
563 | assert(server); | |
564 | assert(address != INADDR_ANY); | |
565 | assert(chaddr); | |
566 | ||
567 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
568 | if (!packet) | |
569 | return -ENOMEM; | |
570 | ||
571 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
76253e73 DW |
572 | DHCP_FORCERENEW, ARPHRD_ETHER, |
573 | DHCP_MIN_OPTIONS_SIZE, &optoffset); | |
52750344 TG |
574 | if (r < 0) |
575 | return r; | |
576 | ||
577 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
22805d92 | 578 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL); |
52750344 TG |
579 | if (r < 0) |
580 | return r; | |
581 | ||
582 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); | |
583 | ||
8eb7b6a5 PF |
584 | r = dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, |
585 | &packet->dhcp, | |
52750344 | 586 | sizeof(DHCPMessage) + optoffset); |
c15fb62a TA |
587 | if (r < 0) |
588 | return r; | |
52750344 TG |
589 | |
590 | return 0; | |
591 | } | |
592 | ||
b3ec603c | 593 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
89ca10c6 | 594 | DHCPRequest *req = userdata; |
816e2e7a TG |
595 | |
596 | assert(req); | |
597 | ||
598 | switch(code) { | |
22805d92 | 599 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
c7d9ffe6 | 600 | if (len == 4) |
9ae84244 | 601 | req->lifetime = unaligned_read_be32(option); |
c7d9ffe6 TG |
602 | |
603 | break; | |
22805d92 | 604 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
2dead812 | 605 | if (len == 4) |
9ae84244 | 606 | memcpy(&req->requested_ip, option, sizeof(be32_t)); |
2dead812 TG |
607 | |
608 | break; | |
22805d92 | 609 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
816e2e7a | 610 | if (len == 4) |
9ae84244 | 611 | memcpy(&req->server_id, option, sizeof(be32_t)); |
816e2e7a TG |
612 | |
613 | break; | |
22805d92 | 614 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
816e2e7a TG |
615 | if (len >= 2) { |
616 | uint8_t *data; | |
617 | ||
618 | data = memdup(option, len); | |
619 | if (!data) | |
620 | return -ENOMEM; | |
621 | ||
622 | free(req->client_id.data); | |
623 | req->client_id.data = data; | |
624 | req->client_id.length = len; | |
625 | } | |
626 | ||
627 | break; | |
22805d92 | 628 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
76a9d0f1 LP |
629 | |
630 | if (len == 2 && unaligned_read_be16(option) >= sizeof(DHCPPacket)) | |
9ae84244 | 631 | req->max_optlen = unaligned_read_be16(option) - sizeof(DHCPPacket); |
816e2e7a TG |
632 | |
633 | break; | |
634 | } | |
635 | ||
636 | return 0; | |
637 | } | |
638 | ||
639 | static void dhcp_request_free(DHCPRequest *req) { | |
640 | if (!req) | |
641 | return; | |
642 | ||
643 | free(req->client_id.data); | |
644 | free(req); | |
645 | } | |
646 | ||
647 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
816e2e7a | 648 | |
586ac6f7 | 649 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
816e2e7a TG |
650 | assert(req); |
651 | assert(message); | |
652 | ||
653 | req->message = message; | |
654 | ||
e2acdb6b | 655 | /* set client id based on MAC address if client did not send an explicit |
a6f1e036 | 656 | one */ |
816e2e7a | 657 | if (!req->client_id.data) { |
9a0f246f | 658 | void *data; |
816e2e7a | 659 | |
9a0f246f | 660 | data = malloc0(ETH_ALEN + 1); |
816e2e7a TG |
661 | if (!data) |
662 | return -ENOMEM; | |
663 | ||
9a0f246f LP |
664 | ((uint8_t*) data)[0] = 0x01; |
665 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN); | |
666 | ||
816e2e7a TG |
667 | req->client_id.length = ETH_ALEN + 1; |
668 | req->client_id.data = data; | |
816e2e7a TG |
669 | } |
670 | ||
671 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) | |
672 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
673 | ||
9a0f246f | 674 | if (req->lifetime <= 0) |
586ac6f7 LP |
675 | req->lifetime = MAX(1ULL, server->default_lease_time); |
676 | ||
677 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
678 | req->lifetime = server->max_lease_time; | |
c7d9ffe6 | 679 | |
816e2e7a TG |
680 | return 0; |
681 | } | |
682 | ||
87322b3a TG |
683 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { |
684 | assert(server); | |
685 | ||
686 | if (!server->pool_size) | |
687 | return -EINVAL; | |
688 | ||
99634696 TG |
689 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
690 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
691 | return -ERANGE; | |
87322b3a | 692 | |
99634696 | 693 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
87322b3a TG |
694 | } |
695 | ||
83cedf7a TG |
696 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
697 | ||
be077570 TG |
698 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, |
699 | size_t length) { | |
8e766630 | 700 | _cleanup_(dhcp_request_freep) DHCPRequest *req = NULL; |
f693e9b3 | 701 | _cleanup_free_ char *error_message = NULL; |
87322b3a | 702 | DHCPLease *existing_lease; |
816e2e7a | 703 | int type, r; |
be077570 TG |
704 | |
705 | assert(server); | |
706 | assert(message); | |
707 | ||
708 | if (message->op != BOOTREQUEST || | |
709 | message->htype != ARPHRD_ETHER || | |
710 | message->hlen != ETHER_ADDR_LEN) | |
711 | return 0; | |
712 | ||
816e2e7a TG |
713 | req = new0(DHCPRequest, 1); |
714 | if (!req) | |
715 | return -ENOMEM; | |
716 | ||
f693e9b3 | 717 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
be077570 TG |
718 | if (type < 0) |
719 | return 0; | |
720 | ||
586ac6f7 | 721 | r = ensure_sane_request(server, req, message); |
816e2e7a TG |
722 | if (r < 0) |
723 | /* this only fails on critical errors */ | |
724 | return r; | |
725 | ||
a6f1e036 TG |
726 | existing_lease = hashmap_get(server->leases_by_client_id, |
727 | &req->client_id); | |
87322b3a | 728 | |
4dc35568 | 729 | switch(type) { |
9a0f246f LP |
730 | |
731 | case DHCP_DISCOVER: { | |
87322b3a TG |
732 | be32_t address = INADDR_ANY; |
733 | unsigned i; | |
2dead812 | 734 | |
4dc35568 TG |
735 | log_dhcp_server(server, "DISCOVER (0x%x)", |
736 | be32toh(req->message->xid)); | |
737 | ||
2dead812 TG |
738 | if (!server->pool_size) |
739 | /* no pool allocated */ | |
740 | return 0; | |
741 | ||
87322b3a TG |
742 | /* for now pick a random free address from the pool */ |
743 | if (existing_lease) | |
744 | address = existing_lease->address; | |
745 | else { | |
b826ab58 | 746 | struct siphash state; |
0cb3c286 | 747 | uint64_t hash; |
99634696 | 748 | uint32_t next_offer; |
83cedf7a TG |
749 | |
750 | /* even with no persistence of leases, we try to offer the same client | |
751 | the same IP address. we do this by using the hash of the client id | |
752 | as the offset into the pool of leases when finding the next free one */ | |
753 | ||
0cb3c286 | 754 | siphash24_init(&state, HASH_KEY.bytes); |
b826ab58 | 755 | client_id_hash_func(&req->client_id, &state); |
933f9cae | 756 | hash = htole64(siphash24_finalize(&state)); |
0cb3c286 | 757 | next_offer = hash % server->pool_size; |
83cedf7a | 758 | |
87322b3a | 759 | for (i = 0; i < server->pool_size; i++) { |
83cedf7a | 760 | if (!server->bound_leases[next_offer]) { |
99634696 | 761 | address = server->subnet | htobe32(server->pool_offset + next_offer); |
87322b3a | 762 | break; |
6408ba5f LP |
763 | } |
764 | ||
765 | next_offer = (next_offer + 1) % server->pool_size; | |
87322b3a TG |
766 | } |
767 | } | |
768 | ||
769 | if (address == INADDR_ANY) | |
770 | /* no free addresses left */ | |
771 | return 0; | |
2dead812 TG |
772 | |
773 | r = server_send_offer(server, req, address); | |
6e741541 | 774 | if (r < 0) |
4dc35568 | 775 | /* this only fails on critical errors */ |
6e741541 | 776 | return log_dhcp_server_errno(server, r, "Could not send offer: %m"); |
be077570 | 777 | |
6e741541 LP |
778 | log_dhcp_server(server, "OFFER (0x%x)", be32toh(req->message->xid)); |
779 | return DHCP_OFFER; | |
4dc35568 | 780 | } |
5b34277c | 781 | case DHCP_DECLINE: |
f693e9b3 | 782 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message)); |
5b34277c TG |
783 | |
784 | /* TODO: make sure we don't offer this address again */ | |
785 | ||
786 | return 1; | |
787 | ||
9a0f246f | 788 | case DHCP_REQUEST: { |
2dead812 | 789 | be32_t address; |
bd57b450 | 790 | bool init_reboot = false; |
87322b3a | 791 | int pool_offset; |
2dead812 TG |
792 | |
793 | /* see RFC 2131, section 4.3.2 */ | |
794 | ||
795 | if (req->server_id) { | |
796 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", | |
797 | be32toh(req->message->xid)); | |
798 | ||
799 | /* SELECTING */ | |
800 | if (req->server_id != server->address) | |
801 | /* client did not pick us */ | |
802 | return 0; | |
803 | ||
804 | if (req->message->ciaddr) | |
805 | /* this MUST be zero */ | |
806 | return 0; | |
807 | ||
808 | if (!req->requested_ip) | |
809 | /* this must be filled in with the yiaddr | |
810 | from the chosen OFFER */ | |
811 | return 0; | |
812 | ||
813 | address = req->requested_ip; | |
814 | } else if (req->requested_ip) { | |
815 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", | |
816 | be32toh(req->message->xid)); | |
817 | ||
818 | /* INIT-REBOOT */ | |
819 | if (req->message->ciaddr) | |
820 | /* this MUST be zero */ | |
821 | return 0; | |
822 | ||
bd57b450 | 823 | /* TODO: check more carefully if IP is correct */ |
2dead812 | 824 | address = req->requested_ip; |
bd57b450 | 825 | init_reboot = true; |
2dead812 TG |
826 | } else { |
827 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
828 | be32toh(req->message->xid)); | |
829 | ||
830 | /* REBINDING / RENEWING */ | |
831 | if (!req->message->ciaddr) | |
832 | /* this MUST be filled in with clients IP address */ | |
833 | return 0; | |
834 | ||
835 | address = req->message->ciaddr; | |
836 | } | |
837 | ||
87322b3a TG |
838 | pool_offset = get_pool_offset(server, address); |
839 | ||
840 | /* verify that the requested address is from the pool, and either | |
841 | owned by the current client or free */ | |
842 | if (pool_offset >= 0 && | |
843 | server->bound_leases[pool_offset] == existing_lease) { | |
844 | DHCPLease *lease; | |
a7f7d1bd | 845 | usec_t time_now = 0; |
87322b3a TG |
846 | |
847 | if (!existing_lease) { | |
848 | lease = new0(DHCPLease, 1); | |
357e1b17 LP |
849 | if (!lease) |
850 | return -ENOMEM; | |
28c78e07 | 851 | lease->address = address; |
87322b3a TG |
852 | lease->client_id.data = memdup(req->client_id.data, |
853 | req->client_id.length); | |
02557f97 TA |
854 | if (!lease->client_id.data) { |
855 | free(lease); | |
87322b3a | 856 | return -ENOMEM; |
02557f97 | 857 | } |
87322b3a | 858 | lease->client_id.length = req->client_id.length; |
a6f1e036 TG |
859 | memcpy(&lease->chaddr, &req->message->chaddr, |
860 | ETH_ALEN); | |
52750344 | 861 | lease->gateway = req->message->giaddr; |
87322b3a TG |
862 | } else |
863 | lease = existing_lease; | |
864 | ||
a6f1e036 TG |
865 | r = sd_event_now(server->event, |
866 | clock_boottime_or_monotonic(), | |
867 | &time_now); | |
bff92d2c SS |
868 | if (r < 0) { |
869 | if (!existing_lease) | |
870 | dhcp_lease_free(lease); | |
38a03f06 | 871 | return r; |
bff92d2c SS |
872 | } |
873 | ||
87322b3a TG |
874 | lease->expiration = req->lifetime * USEC_PER_SEC + time_now; |
875 | ||
2dead812 TG |
876 | r = server_send_ack(server, req, address); |
877 | if (r < 0) { | |
878 | /* this only fails on critical errors */ | |
6e741541 | 879 | log_dhcp_server_errno(server, r, "Could not send ack: %m"); |
87322b3a TG |
880 | |
881 | if (!existing_lease) | |
882 | dhcp_lease_free(lease); | |
883 | ||
2dead812 TG |
884 | return r; |
885 | } else { | |
886 | log_dhcp_server(server, "ACK (0x%x)", | |
887 | be32toh(req->message->xid)); | |
87322b3a TG |
888 | |
889 | server->bound_leases[pool_offset] = lease; | |
a6f1e036 TG |
890 | hashmap_put(server->leases_by_client_id, |
891 | &lease->client_id, lease); | |
87322b3a | 892 | |
2dead812 TG |
893 | return DHCP_ACK; |
894 | } | |
6e741541 | 895 | |
bd57b450 TG |
896 | } else if (init_reboot) { |
897 | r = server_send_nak(server, req); | |
6e741541 | 898 | if (r < 0) |
bd57b450 | 899 | /* this only fails on critical errors */ |
6e741541 LP |
900 | return log_dhcp_server_errno(server, r, "Could not send nak: %m"); |
901 | ||
902 | log_dhcp_server(server, "NAK (0x%x)", be32toh(req->message->xid)); | |
903 | return DHCP_NAK; | |
bd57b450 | 904 | } |
2dead812 TG |
905 | |
906 | break; | |
907 | } | |
9a0f246f | 908 | |
500792d8 TG |
909 | case DHCP_RELEASE: { |
910 | int pool_offset; | |
911 | ||
912 | log_dhcp_server(server, "RELEASE (0x%x)", | |
913 | be32toh(req->message->xid)); | |
914 | ||
915 | if (!existing_lease) | |
916 | return 0; | |
917 | ||
918 | if (existing_lease->address != req->message->ciaddr) | |
919 | return 0; | |
920 | ||
921 | pool_offset = get_pool_offset(server, req->message->ciaddr); | |
922 | if (pool_offset < 0) | |
923 | return 0; | |
924 | ||
925 | if (server->bound_leases[pool_offset] == existing_lease) { | |
926 | server->bound_leases[pool_offset] = NULL; | |
927 | hashmap_remove(server->leases_by_client_id, existing_lease); | |
928 | dhcp_lease_free(existing_lease); | |
c3922c0c | 929 | } |
500792d8 | 930 | |
c3922c0c LP |
931 | return 0; |
932 | }} | |
4dc35568 TG |
933 | |
934 | return 0; | |
be077570 TG |
935 | } |
936 | ||
ff734080 TG |
937 | static int server_receive_message(sd_event_source *s, int fd, |
938 | uint32_t revents, void *userdata) { | |
be077570 | 939 | _cleanup_free_ DHCPMessage *message = NULL; |
3a864fe4 | 940 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))]; |
ff734080 TG |
941 | sd_dhcp_server *server = userdata; |
942 | struct iovec iov = {}; | |
943 | struct msghdr msg = { | |
944 | .msg_iov = &iov, | |
945 | .msg_iovlen = 1, | |
3a864fe4 TG |
946 | .msg_control = cmsgbuf, |
947 | .msg_controllen = sizeof(cmsgbuf), | |
ff734080 | 948 | }; |
3a864fe4 | 949 | struct cmsghdr *cmsg; |
4edc2c9b | 950 | ssize_t buflen, len; |
57027d03 | 951 | int r; |
ff734080 TG |
952 | |
953 | assert(server); | |
954 | ||
4edc2c9b LP |
955 | buflen = next_datagram_size_fd(fd); |
956 | if (buflen < 0) | |
957 | return buflen; | |
ff734080 | 958 | |
0d43d2fc | 959 | message = malloc(buflen); |
ff734080 TG |
960 | if (!message) |
961 | return -ENOMEM; | |
962 | ||
963 | iov.iov_base = message; | |
964 | iov.iov_len = buflen; | |
965 | ||
a38d9945 | 966 | len = recvmsg(fd, &msg, 0); |
0d43d2fc | 967 | if (len < 0) { |
4c701096 | 968 | if (IN_SET(errno, EAGAIN, EINTR)) |
0d43d2fc TG |
969 | return 0; |
970 | ||
971 | return -errno; | |
6408ba5f LP |
972 | } |
973 | if ((size_t)len < sizeof(DHCPMessage)) | |
be077570 | 974 | return 0; |
ff734080 | 975 | |
2a1288ff | 976 | CMSG_FOREACH(cmsg, &msg) { |
3a864fe4 TG |
977 | if (cmsg->cmsg_level == IPPROTO_IP && |
978 | cmsg->cmsg_type == IP_PKTINFO && | |
979 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) { | |
980 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg); | |
981 | ||
a6f1e036 TG |
982 | /* TODO figure out if this can be done as a filter on |
983 | * the socket, like for IPv6 */ | |
b3ec603c | 984 | if (server->ifindex != info->ipi_ifindex) |
3a864fe4 TG |
985 | return 0; |
986 | ||
987 | break; | |
988 | } | |
989 | } | |
990 | ||
57027d03 LP |
991 | r = dhcp_server_handle_message(server, message, (size_t) len); |
992 | if (r < 0) | |
993 | log_dhcp_server_errno(server, r, "Couldn't process incoming message: %m"); | |
994 | ||
995 | return 0; | |
ff734080 TG |
996 | } |
997 | ||
998 | int sd_dhcp_server_start(sd_dhcp_server *server) { | |
999 | int r; | |
1000 | ||
1001 | assert_return(server, -EINVAL); | |
1002 | assert_return(server->event, -EINVAL); | |
1003 | assert_return(!server->receive_message, -EBUSY); | |
cfcbb135 LP |
1004 | assert_return(server->fd_raw < 0, -EBUSY); |
1005 | assert_return(server->fd < 0, -EBUSY); | |
20af7091 | 1006 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH); |
ff734080 | 1007 | |
8de4a226 TG |
1008 | r = socket(AF_PACKET, SOCK_DGRAM | SOCK_NONBLOCK, 0); |
1009 | if (r < 0) { | |
1010 | r = -errno; | |
1011 | sd_dhcp_server_stop(server); | |
1012 | return r; | |
1013 | } | |
1014 | server->fd_raw = r; | |
1015 | ||
3e7b9f76 | 1016 | r = dhcp_network_bind_udp_socket(server->ifindex, INADDR_ANY, DHCP_PORT_SERVER); |
ff734080 TG |
1017 | if (r < 0) { |
1018 | sd_dhcp_server_stop(server); | |
1019 | return r; | |
1020 | } | |
1021 | server->fd = r; | |
1022 | ||
1023 | r = sd_event_add_io(server->event, &server->receive_message, | |
1024 | server->fd, EPOLLIN, | |
1025 | server_receive_message, server); | |
1026 | if (r < 0) { | |
1027 | sd_dhcp_server_stop(server); | |
1028 | return r; | |
1029 | } | |
1030 | ||
1031 | r = sd_event_source_set_priority(server->receive_message, | |
1032 | server->event_priority); | |
1033 | if (r < 0) { | |
1034 | sd_dhcp_server_stop(server); | |
1035 | return r; | |
1036 | } | |
1037 | ||
1038 | log_dhcp_server(server, "STARTED"); | |
1039 | ||
1040 | return 0; | |
1041 | } | |
52750344 TG |
1042 | |
1043 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { | |
1044 | unsigned i; | |
621ac3d2 | 1045 | int r = 0; |
52750344 TG |
1046 | |
1047 | assert_return(server, -EINVAL); | |
1048 | assert(server->bound_leases); | |
1049 | ||
1050 | for (i = 0; i < server->pool_size; i++) { | |
1051 | DHCPLease *lease = server->bound_leases[i]; | |
1052 | ||
99634696 | 1053 | if (!lease || lease == &server->invalid_lease) |
52750344 TG |
1054 | continue; |
1055 | ||
1056 | r = server_send_forcerenew(server, lease->address, | |
1057 | lease->gateway, | |
1058 | lease->chaddr); | |
1059 | if (r < 0) | |
1060 | return r; | |
6408ba5f LP |
1061 | |
1062 | log_dhcp_server(server, "FORCERENEW"); | |
52750344 TG |
1063 | } |
1064 | ||
1065 | return r; | |
1066 | } | |
8eb9058d | 1067 | |
64d6c229 | 1068 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { |
8eb9058d LP |
1069 | int r; |
1070 | ||
1071 | assert_return(server, -EINVAL); | |
089fb865 | 1072 | assert_return(timezone_is_valid(tz, LOG_DEBUG), -EINVAL); |
8eb9058d | 1073 | |
64d6c229 | 1074 | if (streq_ptr(tz, server->timezone)) |
8eb9058d LP |
1075 | return 0; |
1076 | ||
64d6c229 | 1077 | r = free_and_strdup(&server->timezone, tz); |
8eb9058d LP |
1078 | if (r < 0) |
1079 | return r; | |
1080 | ||
1081 | return 1; | |
1082 | } | |
586ac6f7 LP |
1083 | |
1084 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1085 | assert_return(server, -EINVAL); | |
1086 | ||
1087 | if (t == server->max_lease_time) | |
1088 | return 0; | |
1089 | ||
1090 | server->max_lease_time = t; | |
1091 | return 1; | |
1092 | } | |
1093 | ||
1094 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1095 | assert_return(server, -EINVAL); | |
1096 | ||
1097 | if (t == server->default_lease_time) | |
1098 | return 0; | |
1099 | ||
1100 | server->default_lease_time = t; | |
1101 | return 1; | |
1102 | } | |
1a04db0f LP |
1103 | |
1104 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], unsigned n) { | |
1105 | assert_return(server, -EINVAL); | |
1106 | assert_return(dns || n <= 0, -EINVAL); | |
1107 | ||
1108 | if (server->n_dns == n && | |
1109 | memcmp(server->dns, dns, sizeof(struct in_addr) * n) == 0) | |
1110 | return 0; | |
1111 | ||
1112 | if (n <= 0) { | |
1113 | server->dns = mfree(server->dns); | |
1114 | server->n_dns = 0; | |
1115 | } else { | |
1116 | struct in_addr *c; | |
1117 | ||
1118 | c = newdup(struct in_addr, dns, n); | |
1119 | if (!c) | |
1120 | return -ENOMEM; | |
1121 | ||
1122 | free(server->dns); | |
1123 | server->dns = c; | |
1124 | server->n_dns = n; | |
1125 | } | |
1126 | ||
1127 | return 1; | |
1128 | } | |
1129 | ||
1130 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], unsigned n) { | |
1131 | assert_return(server, -EINVAL); | |
1132 | assert_return(ntp || n <= 0, -EINVAL); | |
1133 | ||
1134 | if (server->n_ntp == n && | |
1135 | memcmp(server->ntp, ntp, sizeof(struct in_addr) * n) == 0) | |
1136 | return 0; | |
1137 | ||
1138 | if (n <= 0) { | |
1139 | server->ntp = mfree(server->ntp); | |
1140 | server->n_ntp = 0; | |
1141 | } else { | |
1142 | struct in_addr *c; | |
1143 | ||
1144 | c = newdup(struct in_addr, ntp, n); | |
1145 | if (!c) | |
1146 | return -ENOMEM; | |
1147 | ||
1148 | free(server->ntp); | |
1149 | server->ntp = c; | |
1150 | server->n_ntp = n; | |
1151 | } | |
1152 | ||
1153 | return 1; | |
1154 | } | |
77ff6022 CG |
1155 | |
1156 | int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled) { | |
1157 | assert_return(server, -EINVAL); | |
1158 | ||
1159 | if (enabled == server->emit_router) | |
1160 | return 0; | |
1161 | ||
1162 | server->emit_router = enabled; | |
1163 | ||
1164 | return 1; | |
1165 | } |