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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b44cd882 | 2 | /*** |
810adae9 LP |
3 | Copyright © 2013 Intel Corporation. All rights reserved. |
4 | Copyright © 2014 Tom Gundersen | |
b44cd882 TG |
5 | ***/ |
6 | ||
ff734080 TG |
7 | #include <sys/ioctl.h> |
8 | ||
b44cd882 | 9 | #include "sd-dhcp-server.h" |
07630cea | 10 | |
b5efdb8a | 11 | #include "alloc-util.h" |
ff734080 | 12 | #include "dhcp-internal.h" |
07630cea | 13 | #include "dhcp-server-internal.h" |
3ffd4af2 | 14 | #include "fd-util.h" |
07630cea | 15 | #include "in-addr-util.h" |
dccca82b | 16 | #include "sd-id128.h" |
07630cea LP |
17 | #include "siphash24.h" |
18 | #include "string-util.h" | |
9ae84244 | 19 | #include "unaligned.h" |
b44cd882 | 20 | |
586ac6f7 LP |
21 | #define DHCP_DEFAULT_LEASE_TIME_USEC USEC_PER_HOUR |
22 | #define DHCP_MAX_LEASE_TIME_USEC (USEC_PER_HOUR*12) | |
4dc35568 | 23 | |
45a9eac9 RM |
24 | static void dhcp_lease_free(DHCPLease *lease) { |
25 | if (!lease) | |
26 | return; | |
27 | ||
28 | free(lease->client_id.data); | |
29 | free(lease); | |
30 | } | |
31 | ||
99634696 TG |
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; | |
40 | ||
2dead812 TG |
41 | assert_return(server, -EINVAL); |
42 | assert_return(address, -EINVAL); | |
99634696 TG |
43 | assert_return(address->s_addr != INADDR_ANY, -EINVAL); |
44 | assert_return(prefixlen <= 32, -ERANGE); | |
99634696 | 45 | |
5a941f5f | 46 | assert_se(in4_addr_prefixlen_to_netmask(&netmask_addr, prefixlen)); |
99634696 TG |
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; | |
87322b3a | 74 | |
45a9eac9 | 75 | if (server->address != address->s_addr || server->netmask != netmask || server->pool_size != size || server->pool_offset != offset) { |
45a9eac9 RM |
76 | |
77 | free(server->bound_leases); | |
78 | server->bound_leases = new0(DHCPLease*, size); | |
79 | if (!server->bound_leases) | |
80 | return -ENOMEM; | |
2dead812 | 81 | |
45a9eac9 RM |
82 | server->pool_offset = offset; |
83 | server->pool_size = size; | |
2dead812 | 84 | |
45a9eac9 RM |
85 | server->address = address->s_addr; |
86 | server->netmask = netmask; | |
87 | server->subnet = address->s_addr & netmask; | |
99634696 | 88 | |
45a9eac9 RM |
89 | if (server_off >= offset && server_off - offset < size) |
90 | server->bound_leases[server_off - offset] = &server->invalid_lease; | |
91 | ||
92 | /* Drop any leases associated with the old address range */ | |
224b0e7a | 93 | hashmap_clear_with_destructor(server->leases_by_client_id, dhcp_lease_free); |
45a9eac9 | 94 | } |
20af7091 TG |
95 | |
96 | return 0; | |
97 | } | |
98 | ||
04c01369 | 99 | int sd_dhcp_server_is_running(sd_dhcp_server *server) { |
75677581 | 100 | assert_return(server, false); |
7c16313f TG |
101 | |
102 | return !!server->receive_message; | |
103 | } | |
104 | ||
b44cd882 | 105 | sd_dhcp_server *sd_dhcp_server_ref(sd_dhcp_server *server) { |
3733eec3 LP |
106 | |
107 | if (!server) | |
108 | return NULL; | |
109 | ||
110 | assert(server->n_ref >= 1); | |
111 | server->n_ref++; | |
b44cd882 TG |
112 | |
113 | return server; | |
114 | } | |
115 | ||
b826ab58 | 116 | void client_id_hash_func(const void *p, struct siphash *state) { |
87322b3a TG |
117 | const DHCPClientId *id = p; |
118 | ||
119 | assert(id); | |
120 | assert(id->length); | |
121 | assert(id->data); | |
122 | ||
1e2527a6 | 123 | siphash24_compress(&id->length, sizeof(id->length), state); |
b826ab58 | 124 | siphash24_compress(id->data, id->length, state); |
87322b3a TG |
125 | } |
126 | ||
127 | int client_id_compare_func(const void *_a, const void *_b) { | |
128 | const DHCPClientId *a, *b; | |
129 | ||
130 | a = _a; | |
131 | b = _b; | |
132 | ||
133 | assert(!a->length || a->data); | |
134 | assert(!b->length || b->data); | |
135 | ||
136 | if (a->length != b->length) | |
137 | return a->length < b->length ? -1 : 1; | |
138 | ||
139 | return memcmp(a->data, b->data, a->length); | |
140 | } | |
141 | ||
d5099efc MS |
142 | static const struct hash_ops client_id_hash_ops = { |
143 | .hash = client_id_hash_func, | |
144 | .compare = client_id_compare_func | |
145 | }; | |
146 | ||
b44cd882 | 147 | sd_dhcp_server *sd_dhcp_server_unref(sd_dhcp_server *server) { |
3bdace9b | 148 | DHCPLease *lease; |
87322b3a | 149 | |
3bdace9b LP |
150 | if (!server) |
151 | return NULL; | |
b44cd882 | 152 | |
3733eec3 LP |
153 | assert(server->n_ref >= 1); |
154 | server->n_ref--; | |
155 | ||
156 | if (server->n_ref > 0) | |
3bdace9b | 157 | return NULL; |
ff734080 | 158 | |
3bdace9b | 159 | log_dhcp_server(server, "UNREF"); |
87322b3a | 160 | |
3bdace9b | 161 | sd_dhcp_server_stop(server); |
87322b3a | 162 | |
3bdace9b LP |
163 | sd_event_unref(server->event); |
164 | ||
8eb9058d | 165 | free(server->timezone); |
1a04db0f LP |
166 | free(server->dns); |
167 | free(server->ntp); | |
8eb9058d | 168 | |
3bdace9b LP |
169 | while ((lease = hashmap_steal_first(server->leases_by_client_id))) |
170 | dhcp_lease_free(lease); | |
171 | hashmap_free(server->leases_by_client_id); | |
172 | ||
173 | free(server->bound_leases); | |
6b430fdb | 174 | return mfree(server); |
b44cd882 TG |
175 | } |
176 | ||
3a864fe4 | 177 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
4afd3348 | 178 | _cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL; |
b44cd882 TG |
179 | |
180 | assert_return(ret, -EINVAL); | |
3a864fe4 | 181 | assert_return(ifindex > 0, -EINVAL); |
b44cd882 TG |
182 | |
183 | server = new0(sd_dhcp_server, 1); | |
184 | if (!server) | |
185 | return -ENOMEM; | |
186 | ||
3733eec3 | 187 | server->n_ref = 1; |
8de4a226 | 188 | server->fd_raw = -1; |
ff734080 | 189 | server->fd = -1; |
20af7091 | 190 | server->address = htobe32(INADDR_ANY); |
59b8f6b6 | 191 | server->netmask = htobe32(INADDR_ANY); |
b3ec603c | 192 | server->ifindex = ifindex; |
357e1b17 | 193 | |
d5099efc | 194 | server->leases_by_client_id = hashmap_new(&client_id_hash_ops); |
357e1b17 LP |
195 | if (!server->leases_by_client_id) |
196 | return -ENOMEM; | |
197 | ||
586ac6f7 LP |
198 | server->default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC); |
199 | server->max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC); | |
b44cd882 | 200 | |
1cc6c93a | 201 | *ret = TAKE_PTR(server); |
b44cd882 TG |
202 | |
203 | return 0; | |
204 | } | |
205 | ||
32d20645 | 206 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int64_t priority) { |
b44cd882 TG |
207 | int r; |
208 | ||
209 | assert_return(server, -EINVAL); | |
210 | assert_return(!server->event, -EBUSY); | |
211 | ||
212 | if (event) | |
213 | server->event = sd_event_ref(event); | |
214 | else { | |
215 | r = sd_event_default(&server->event); | |
216 | if (r < 0) | |
217 | return r; | |
218 | } | |
219 | ||
220 | server->event_priority = priority; | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
226 | assert_return(server, -EINVAL); | |
227 | ||
228 | server->event = sd_event_unref(server->event); | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
234 | assert_return(server, NULL); | |
235 | ||
236 | return server->event; | |
237 | } | |
ff734080 TG |
238 | |
239 | int sd_dhcp_server_stop(sd_dhcp_server *server) { | |
240 | assert_return(server, -EINVAL); | |
241 | ||
242 | server->receive_message = | |
243 | sd_event_source_unref(server->receive_message); | |
244 | ||
8de4a226 | 245 | server->fd_raw = safe_close(server->fd_raw); |
ff734080 TG |
246 | server->fd = safe_close(server->fd); |
247 | ||
248 | log_dhcp_server(server, "STOPPED"); | |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
a6f1e036 TG |
253 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
254 | DHCPPacket *packet, size_t len) { | |
969b009d TG |
255 | union sockaddr_union link = { |
256 | .ll.sll_family = AF_PACKET, | |
8e38570e | 257 | .ll.sll_protocol = htobe16(ETH_P_IP), |
b3ec603c | 258 | .ll.sll_ifindex = server->ifindex, |
969b009d TG |
259 | .ll.sll_halen = ETH_ALEN, |
260 | }; | |
969b009d TG |
261 | |
262 | assert(server); | |
b3ec603c | 263 | assert(server->ifindex > 0); |
969b009d TG |
264 | assert(server->address); |
265 | assert(packet); | |
266 | assert(len > sizeof(DHCPPacket)); | |
267 | ||
268 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN); | |
269 | ||
270 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, | |
a6f1e036 TG |
271 | packet->dhcp.yiaddr, |
272 | DHCP_PORT_CLIENT, len); | |
969b009d | 273 | |
b3ec603c | 274 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
969b009d TG |
275 | } |
276 | ||
277 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
8eb7b6a5 | 278 | uint16_t destination_port, |
969b009d TG |
279 | DHCPMessage *message, size_t len) { |
280 | union sockaddr_union dest = { | |
281 | .in.sin_family = AF_INET, | |
8eb7b6a5 | 282 | .in.sin_port = htobe16(destination_port), |
969b009d TG |
283 | .in.sin_addr.s_addr = destination, |
284 | }; | |
285 | struct iovec iov = { | |
286 | .iov_base = message, | |
287 | .iov_len = len, | |
288 | }; | |
289 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))] = {}; | |
290 | struct msghdr msg = { | |
291 | .msg_name = &dest, | |
292 | .msg_namelen = sizeof(dest.in), | |
293 | .msg_iov = &iov, | |
294 | .msg_iovlen = 1, | |
295 | .msg_control = cmsgbuf, | |
296 | .msg_controllen = sizeof(cmsgbuf), | |
297 | }; | |
298 | struct cmsghdr *cmsg; | |
299 | struct in_pktinfo *pktinfo; | |
969b009d TG |
300 | |
301 | assert(server); | |
4c9cb12c | 302 | assert(server->fd >= 0); |
969b009d TG |
303 | assert(message); |
304 | assert(len > sizeof(DHCPMessage)); | |
305 | ||
306 | cmsg = CMSG_FIRSTHDR(&msg); | |
307 | assert(cmsg); | |
308 | ||
309 | cmsg->cmsg_level = IPPROTO_IP; | |
310 | cmsg->cmsg_type = IP_PKTINFO; | |
311 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
312 | ||
313 | /* we attach source interface and address info to the message | |
314 | rather than binding the socket. This will be mostly useful | |
315 | when we gain support for arbitrary number of server addresses | |
316 | */ | |
317 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
318 | assert(pktinfo); | |
319 | ||
b3ec603c | 320 | pktinfo->ipi_ifindex = server->ifindex; |
969b009d TG |
321 | pktinfo->ipi_spec_dst.s_addr = server->address; |
322 | ||
0f01c1f9 | 323 | if (sendmsg(server->fd, &msg, 0) < 0) |
969b009d TG |
324 | return -errno; |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | static bool requested_broadcast(DHCPRequest *req) { | |
330 | assert(req); | |
331 | ||
332 | return req->message->flags & htobe16(0x8000); | |
333 | } | |
334 | ||
335 | int dhcp_server_send_packet(sd_dhcp_server *server, | |
336 | DHCPRequest *req, DHCPPacket *packet, | |
337 | int type, size_t optoffset) { | |
338 | be32_t destination = INADDR_ANY; | |
8eb7b6a5 | 339 | uint16_t destination_port = DHCP_PORT_CLIENT; |
969b009d TG |
340 | int r; |
341 | ||
342 | assert(server); | |
343 | assert(req); | |
344 | assert(req->max_optlen); | |
345 | assert(optoffset <= req->max_optlen); | |
346 | assert(packet); | |
347 | ||
348 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 349 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
969b009d TG |
350 | 4, &server->address); |
351 | if (r < 0) | |
352 | return r; | |
353 | ||
354 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 355 | SD_DHCP_OPTION_END, 0, NULL); |
969b009d TG |
356 | if (r < 0) |
357 | return r; | |
358 | ||
359 | /* RFC 2131 Section 4.1 | |
360 | ||
361 | If the ’giaddr’ field in a DHCP message from a client is non-zero, | |
362 | the server sends any return messages to the ’DHCP server’ port on the | |
363 | BOOTP relay agent whose address appears in ’giaddr’. If the ’giaddr’ | |
364 | field is zero and the ’ciaddr’ field is nonzero, then the server | |
365 | unicasts DHCPOFFER and DHCPACK messages to the address in ’ciaddr’. | |
366 | If ’giaddr’ is zero and ’ciaddr’ is zero, and the broadcast bit is | |
367 | set, then the server broadcasts DHCPOFFER and DHCPACK messages to | |
368 | 0xffffffff. If the broadcast bit is not set and ’giaddr’ is zero and | |
369 | ’ciaddr’ is zero, then the server unicasts DHCPOFFER and DHCPACK | |
370 | messages to the client’s hardware address and ’yiaddr’ address. In | |
371 | all cases, when ’giaddr’ is zero, the server broadcasts any DHCPNAK | |
372 | messages to 0xffffffff. | |
373 | ||
374 | Section 4.3.2 | |
375 | ||
376 | If ’giaddr’ is set in the DHCPREQUEST message, the client is on a | |
377 | different subnet. The server MUST set the broadcast bit in the | |
378 | DHCPNAK, so that the relay agent will broadcast the DHCPNAK to the | |
379 | client, because the client may not have a correct network address | |
380 | or subnet mask, and the client may not be answering ARP requests. | |
381 | */ | |
382 | if (req->message->giaddr) { | |
383 | destination = req->message->giaddr; | |
8eb7b6a5 | 384 | destination_port = DHCP_PORT_SERVER; |
969b009d TG |
385 | if (type == DHCP_NAK) |
386 | packet->dhcp.flags = htobe16(0x8000); | |
387 | } else if (req->message->ciaddr && type != DHCP_NAK) | |
388 | destination = req->message->ciaddr; | |
389 | ||
d6bd972d | 390 | if (destination != INADDR_ANY) |
8eb7b6a5 PF |
391 | return dhcp_server_send_udp(server, destination, |
392 | destination_port, &packet->dhcp, | |
969b009d | 393 | sizeof(DHCPMessage) + optoffset); |
d6bd972d | 394 | else if (requested_broadcast(req) || type == DHCP_NAK) |
a6f1e036 | 395 | return dhcp_server_send_udp(server, INADDR_BROADCAST, |
8eb7b6a5 | 396 | destination_port, &packet->dhcp, |
d6bd972d | 397 | sizeof(DHCPMessage) + optoffset); |
969b009d | 398 | else |
a6f1e036 TG |
399 | /* we cannot send UDP packet to specific MAC address when the |
400 | address is not yet configured, so must fall back to raw | |
401 | packets */ | |
969b009d TG |
402 | return dhcp_server_send_unicast_raw(server, packet, |
403 | sizeof(DHCPPacket) + optoffset); | |
404 | } | |
405 | ||
4dc35568 | 406 | static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret, |
a6f1e036 TG |
407 | uint8_t type, size_t *_optoffset, |
408 | DHCPRequest *req) { | |
4dc35568 | 409 | _cleanup_free_ DHCPPacket *packet = NULL; |
1231c4d2 | 410 | size_t optoffset = 0; |
4dc35568 TG |
411 | int r; |
412 | ||
413 | assert(server); | |
414 | assert(ret); | |
415 | assert(_optoffset); | |
bd57b450 | 416 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)); |
4dc35568 TG |
417 | |
418 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen); | |
419 | if (!packet) | |
420 | return -ENOMEM; | |
421 | ||
a6f1e036 | 422 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
76253e73 DW |
423 | be32toh(req->message->xid), type, ARPHRD_ETHER, |
424 | req->max_optlen, &optoffset); | |
4dc35568 TG |
425 | if (r < 0) |
426 | return r; | |
427 | ||
428 | packet->dhcp.flags = req->message->flags; | |
429 | packet->dhcp.giaddr = req->message->giaddr; | |
430 | memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN); | |
431 | ||
432 | *_optoffset = optoffset; | |
1cc6c93a | 433 | *ret = TAKE_PTR(packet); |
4dc35568 TG |
434 | |
435 | return 0; | |
436 | } | |
437 | ||
a6f1e036 TG |
438 | static int server_send_offer(sd_dhcp_server *server, DHCPRequest *req, |
439 | be32_t address) { | |
4dc35568 TG |
440 | _cleanup_free_ DHCPPacket *packet = NULL; |
441 | size_t offset; | |
442 | be32_t lease_time; | |
443 | int r; | |
444 | ||
445 | r = server_message_init(server, &packet, DHCP_OFFER, &offset, req); | |
446 | if (r < 0) | |
447 | return r; | |
448 | ||
2dead812 | 449 | packet->dhcp.yiaddr = address; |
4dc35568 | 450 | |
c7d9ffe6 | 451 | lease_time = htobe32(req->lifetime); |
4dc35568 | 452 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 453 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 454 | &lease_time); |
4dc35568 TG |
455 | if (r < 0) |
456 | return r; | |
457 | ||
59b8f6b6 | 458 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 459 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
460 | if (r < 0) |
461 | return r; | |
462 | ||
77ff6022 CG |
463 | if (server->emit_router) { |
464 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
465 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
466 | if (r < 0) | |
467 | return r; | |
468 | } | |
59b8f6b6 | 469 | |
4dc35568 TG |
470 | r = dhcp_server_send_packet(server, req, packet, DHCP_OFFER, offset); |
471 | if (r < 0) | |
472 | return r; | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
a6f1e036 TG |
477 | static int server_send_ack(sd_dhcp_server *server, DHCPRequest *req, |
478 | be32_t address) { | |
2dead812 TG |
479 | _cleanup_free_ DHCPPacket *packet = NULL; |
480 | size_t offset; | |
481 | be32_t lease_time; | |
482 | int r; | |
483 | ||
484 | r = server_message_init(server, &packet, DHCP_ACK, &offset, req); | |
485 | if (r < 0) | |
486 | return r; | |
487 | ||
488 | packet->dhcp.yiaddr = address; | |
489 | ||
c7d9ffe6 | 490 | lease_time = htobe32(req->lifetime); |
2dead812 | 491 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 492 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 493 | &lease_time); |
2dead812 TG |
494 | if (r < 0) |
495 | return r; | |
496 | ||
59b8f6b6 | 497 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 498 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
499 | if (r < 0) |
500 | return r; | |
501 | ||
77ff6022 CG |
502 | if (server->emit_router) { |
503 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
504 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
505 | if (r < 0) | |
506 | return r; | |
507 | } | |
59b8f6b6 | 508 | |
1a04db0f LP |
509 | if (server->n_dns > 0) { |
510 | r = dhcp_option_append( | |
511 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 512 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, |
1a04db0f LP |
513 | sizeof(struct in_addr) * server->n_dns, server->dns); |
514 | if (r < 0) | |
515 | return r; | |
516 | } | |
517 | ||
518 | if (server->n_ntp > 0) { | |
519 | r = dhcp_option_append( | |
520 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 521 | SD_DHCP_OPTION_NTP_SERVER, |
1a04db0f LP |
522 | sizeof(struct in_addr) * server->n_ntp, server->ntp); |
523 | if (r < 0) | |
524 | return r; | |
525 | } | |
526 | ||
8eb9058d LP |
527 | if (server->timezone) { |
528 | r = dhcp_option_append( | |
529 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 530 | SD_DHCP_OPTION_NEW_TZDB_TIMEZONE, |
8eb9058d LP |
531 | strlen(server->timezone), server->timezone); |
532 | if (r < 0) | |
533 | return r; | |
534 | } | |
535 | ||
2dead812 TG |
536 | r = dhcp_server_send_packet(server, req, packet, DHCP_ACK, offset); |
537 | if (r < 0) | |
538 | return r; | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
bd57b450 TG |
543 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { |
544 | _cleanup_free_ DHCPPacket *packet = NULL; | |
545 | size_t offset; | |
546 | int r; | |
547 | ||
548 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); | |
549 | if (r < 0) | |
550 | return r; | |
551 | ||
b3ec603c | 552 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
bd57b450 TG |
553 | } |
554 | ||
a6f1e036 TG |
555 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
556 | be32_t gateway, uint8_t chaddr[]) { | |
52750344 TG |
557 | _cleanup_free_ DHCPPacket *packet = NULL; |
558 | size_t optoffset = 0; | |
559 | int r; | |
560 | ||
561 | assert(server); | |
562 | assert(address != INADDR_ANY); | |
563 | assert(chaddr); | |
564 | ||
565 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
566 | if (!packet) | |
567 | return -ENOMEM; | |
568 | ||
569 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
76253e73 DW |
570 | DHCP_FORCERENEW, ARPHRD_ETHER, |
571 | DHCP_MIN_OPTIONS_SIZE, &optoffset); | |
52750344 TG |
572 | if (r < 0) |
573 | return r; | |
574 | ||
575 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
22805d92 | 576 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL); |
52750344 TG |
577 | if (r < 0) |
578 | return r; | |
579 | ||
580 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); | |
581 | ||
8eb7b6a5 PF |
582 | r = dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, |
583 | &packet->dhcp, | |
52750344 | 584 | sizeof(DHCPMessage) + optoffset); |
c15fb62a TA |
585 | if (r < 0) |
586 | return r; | |
52750344 TG |
587 | |
588 | return 0; | |
589 | } | |
590 | ||
b3ec603c | 591 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
89ca10c6 | 592 | DHCPRequest *req = userdata; |
816e2e7a TG |
593 | |
594 | assert(req); | |
595 | ||
596 | switch(code) { | |
22805d92 | 597 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
c7d9ffe6 | 598 | if (len == 4) |
9ae84244 | 599 | req->lifetime = unaligned_read_be32(option); |
c7d9ffe6 TG |
600 | |
601 | break; | |
22805d92 | 602 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
2dead812 | 603 | if (len == 4) |
9ae84244 | 604 | memcpy(&req->requested_ip, option, sizeof(be32_t)); |
2dead812 TG |
605 | |
606 | break; | |
22805d92 | 607 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
816e2e7a | 608 | if (len == 4) |
9ae84244 | 609 | memcpy(&req->server_id, option, sizeof(be32_t)); |
816e2e7a TG |
610 | |
611 | break; | |
22805d92 | 612 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
816e2e7a TG |
613 | if (len >= 2) { |
614 | uint8_t *data; | |
615 | ||
616 | data = memdup(option, len); | |
617 | if (!data) | |
618 | return -ENOMEM; | |
619 | ||
620 | free(req->client_id.data); | |
621 | req->client_id.data = data; | |
622 | req->client_id.length = len; | |
623 | } | |
624 | ||
625 | break; | |
22805d92 | 626 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
76a9d0f1 LP |
627 | |
628 | if (len == 2 && unaligned_read_be16(option) >= sizeof(DHCPPacket)) | |
9ae84244 | 629 | req->max_optlen = unaligned_read_be16(option) - sizeof(DHCPPacket); |
816e2e7a TG |
630 | |
631 | break; | |
632 | } | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
637 | static void dhcp_request_free(DHCPRequest *req) { | |
638 | if (!req) | |
639 | return; | |
640 | ||
641 | free(req->client_id.data); | |
642 | free(req); | |
643 | } | |
644 | ||
645 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
816e2e7a | 646 | |
586ac6f7 | 647 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
816e2e7a TG |
648 | assert(req); |
649 | assert(message); | |
650 | ||
651 | req->message = message; | |
652 | ||
e2acdb6b | 653 | /* set client id based on MAC address if client did not send an explicit |
a6f1e036 | 654 | one */ |
816e2e7a | 655 | if (!req->client_id.data) { |
9a0f246f | 656 | void *data; |
816e2e7a | 657 | |
9a0f246f | 658 | data = malloc0(ETH_ALEN + 1); |
816e2e7a TG |
659 | if (!data) |
660 | return -ENOMEM; | |
661 | ||
9a0f246f LP |
662 | ((uint8_t*) data)[0] = 0x01; |
663 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN); | |
664 | ||
816e2e7a TG |
665 | req->client_id.length = ETH_ALEN + 1; |
666 | req->client_id.data = data; | |
816e2e7a TG |
667 | } |
668 | ||
669 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) | |
670 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
671 | ||
9a0f246f | 672 | if (req->lifetime <= 0) |
586ac6f7 LP |
673 | req->lifetime = MAX(1ULL, server->default_lease_time); |
674 | ||
675 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
676 | req->lifetime = server->max_lease_time; | |
c7d9ffe6 | 677 | |
816e2e7a TG |
678 | return 0; |
679 | } | |
680 | ||
87322b3a TG |
681 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { |
682 | assert(server); | |
683 | ||
684 | if (!server->pool_size) | |
685 | return -EINVAL; | |
686 | ||
99634696 TG |
687 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
688 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
689 | return -ERANGE; | |
87322b3a | 690 | |
99634696 | 691 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
87322b3a TG |
692 | } |
693 | ||
83cedf7a TG |
694 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
695 | ||
be077570 TG |
696 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, |
697 | size_t length) { | |
8e766630 | 698 | _cleanup_(dhcp_request_freep) DHCPRequest *req = NULL; |
f693e9b3 | 699 | _cleanup_free_ char *error_message = NULL; |
87322b3a | 700 | DHCPLease *existing_lease; |
816e2e7a | 701 | int type, r; |
be077570 TG |
702 | |
703 | assert(server); | |
704 | assert(message); | |
705 | ||
706 | if (message->op != BOOTREQUEST || | |
707 | message->htype != ARPHRD_ETHER || | |
708 | message->hlen != ETHER_ADDR_LEN) | |
709 | return 0; | |
710 | ||
816e2e7a TG |
711 | req = new0(DHCPRequest, 1); |
712 | if (!req) | |
713 | return -ENOMEM; | |
714 | ||
f693e9b3 | 715 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
be077570 TG |
716 | if (type < 0) |
717 | return 0; | |
718 | ||
586ac6f7 | 719 | r = ensure_sane_request(server, req, message); |
816e2e7a TG |
720 | if (r < 0) |
721 | /* this only fails on critical errors */ | |
722 | return r; | |
723 | ||
a6f1e036 TG |
724 | existing_lease = hashmap_get(server->leases_by_client_id, |
725 | &req->client_id); | |
87322b3a | 726 | |
4dc35568 | 727 | switch(type) { |
9a0f246f LP |
728 | |
729 | case DHCP_DISCOVER: { | |
87322b3a TG |
730 | be32_t address = INADDR_ANY; |
731 | unsigned i; | |
2dead812 | 732 | |
4dc35568 TG |
733 | log_dhcp_server(server, "DISCOVER (0x%x)", |
734 | be32toh(req->message->xid)); | |
735 | ||
2dead812 TG |
736 | if (!server->pool_size) |
737 | /* no pool allocated */ | |
738 | return 0; | |
739 | ||
87322b3a TG |
740 | /* for now pick a random free address from the pool */ |
741 | if (existing_lease) | |
742 | address = existing_lease->address; | |
743 | else { | |
b826ab58 | 744 | struct siphash state; |
0cb3c286 | 745 | uint64_t hash; |
99634696 | 746 | uint32_t next_offer; |
83cedf7a TG |
747 | |
748 | /* even with no persistence of leases, we try to offer the same client | |
749 | the same IP address. we do this by using the hash of the client id | |
750 | as the offset into the pool of leases when finding the next free one */ | |
751 | ||
0cb3c286 | 752 | siphash24_init(&state, HASH_KEY.bytes); |
b826ab58 | 753 | client_id_hash_func(&req->client_id, &state); |
933f9cae | 754 | hash = htole64(siphash24_finalize(&state)); |
0cb3c286 | 755 | next_offer = hash % server->pool_size; |
83cedf7a | 756 | |
87322b3a | 757 | for (i = 0; i < server->pool_size; i++) { |
83cedf7a | 758 | if (!server->bound_leases[next_offer]) { |
99634696 | 759 | address = server->subnet | htobe32(server->pool_offset + next_offer); |
87322b3a | 760 | break; |
6408ba5f LP |
761 | } |
762 | ||
763 | next_offer = (next_offer + 1) % server->pool_size; | |
87322b3a TG |
764 | } |
765 | } | |
766 | ||
767 | if (address == INADDR_ANY) | |
768 | /* no free addresses left */ | |
769 | return 0; | |
2dead812 TG |
770 | |
771 | r = server_send_offer(server, req, address); | |
6e741541 | 772 | if (r < 0) |
4dc35568 | 773 | /* this only fails on critical errors */ |
6e741541 | 774 | return log_dhcp_server_errno(server, r, "Could not send offer: %m"); |
be077570 | 775 | |
6e741541 LP |
776 | log_dhcp_server(server, "OFFER (0x%x)", be32toh(req->message->xid)); |
777 | return DHCP_OFFER; | |
4dc35568 | 778 | } |
5b34277c | 779 | case DHCP_DECLINE: |
f693e9b3 | 780 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message)); |
5b34277c TG |
781 | |
782 | /* TODO: make sure we don't offer this address again */ | |
783 | ||
784 | return 1; | |
785 | ||
9a0f246f | 786 | case DHCP_REQUEST: { |
2dead812 | 787 | be32_t address; |
bd57b450 | 788 | bool init_reboot = false; |
87322b3a | 789 | int pool_offset; |
2dead812 TG |
790 | |
791 | /* see RFC 2131, section 4.3.2 */ | |
792 | ||
793 | if (req->server_id) { | |
794 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", | |
795 | be32toh(req->message->xid)); | |
796 | ||
797 | /* SELECTING */ | |
798 | if (req->server_id != server->address) | |
799 | /* client did not pick us */ | |
800 | return 0; | |
801 | ||
802 | if (req->message->ciaddr) | |
803 | /* this MUST be zero */ | |
804 | return 0; | |
805 | ||
806 | if (!req->requested_ip) | |
807 | /* this must be filled in with the yiaddr | |
808 | from the chosen OFFER */ | |
809 | return 0; | |
810 | ||
811 | address = req->requested_ip; | |
812 | } else if (req->requested_ip) { | |
813 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", | |
814 | be32toh(req->message->xid)); | |
815 | ||
816 | /* INIT-REBOOT */ | |
817 | if (req->message->ciaddr) | |
818 | /* this MUST be zero */ | |
819 | return 0; | |
820 | ||
bd57b450 | 821 | /* TODO: check more carefully if IP is correct */ |
2dead812 | 822 | address = req->requested_ip; |
bd57b450 | 823 | init_reboot = true; |
2dead812 TG |
824 | } else { |
825 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
826 | be32toh(req->message->xid)); | |
827 | ||
828 | /* REBINDING / RENEWING */ | |
829 | if (!req->message->ciaddr) | |
830 | /* this MUST be filled in with clients IP address */ | |
831 | return 0; | |
832 | ||
833 | address = req->message->ciaddr; | |
834 | } | |
835 | ||
87322b3a TG |
836 | pool_offset = get_pool_offset(server, address); |
837 | ||
838 | /* verify that the requested address is from the pool, and either | |
839 | owned by the current client or free */ | |
840 | if (pool_offset >= 0 && | |
841 | server->bound_leases[pool_offset] == existing_lease) { | |
842 | DHCPLease *lease; | |
a7f7d1bd | 843 | usec_t time_now = 0; |
87322b3a TG |
844 | |
845 | if (!existing_lease) { | |
846 | lease = new0(DHCPLease, 1); | |
357e1b17 LP |
847 | if (!lease) |
848 | return -ENOMEM; | |
28c78e07 | 849 | lease->address = address; |
87322b3a TG |
850 | lease->client_id.data = memdup(req->client_id.data, |
851 | req->client_id.length); | |
02557f97 TA |
852 | if (!lease->client_id.data) { |
853 | free(lease); | |
87322b3a | 854 | return -ENOMEM; |
02557f97 | 855 | } |
87322b3a | 856 | lease->client_id.length = req->client_id.length; |
a6f1e036 TG |
857 | memcpy(&lease->chaddr, &req->message->chaddr, |
858 | ETH_ALEN); | |
52750344 | 859 | lease->gateway = req->message->giaddr; |
87322b3a TG |
860 | } else |
861 | lease = existing_lease; | |
862 | ||
a6f1e036 TG |
863 | r = sd_event_now(server->event, |
864 | clock_boottime_or_monotonic(), | |
865 | &time_now); | |
bff92d2c SS |
866 | if (r < 0) { |
867 | if (!existing_lease) | |
868 | dhcp_lease_free(lease); | |
38a03f06 | 869 | return r; |
bff92d2c SS |
870 | } |
871 | ||
87322b3a TG |
872 | lease->expiration = req->lifetime * USEC_PER_SEC + time_now; |
873 | ||
2dead812 TG |
874 | r = server_send_ack(server, req, address); |
875 | if (r < 0) { | |
876 | /* this only fails on critical errors */ | |
6e741541 | 877 | log_dhcp_server_errno(server, r, "Could not send ack: %m"); |
87322b3a TG |
878 | |
879 | if (!existing_lease) | |
880 | dhcp_lease_free(lease); | |
881 | ||
2dead812 TG |
882 | return r; |
883 | } else { | |
884 | log_dhcp_server(server, "ACK (0x%x)", | |
885 | be32toh(req->message->xid)); | |
87322b3a TG |
886 | |
887 | server->bound_leases[pool_offset] = lease; | |
a6f1e036 TG |
888 | hashmap_put(server->leases_by_client_id, |
889 | &lease->client_id, lease); | |
87322b3a | 890 | |
2dead812 TG |
891 | return DHCP_ACK; |
892 | } | |
6e741541 | 893 | |
bd57b450 TG |
894 | } else if (init_reboot) { |
895 | r = server_send_nak(server, req); | |
6e741541 | 896 | if (r < 0) |
bd57b450 | 897 | /* this only fails on critical errors */ |
6e741541 LP |
898 | return log_dhcp_server_errno(server, r, "Could not send nak: %m"); |
899 | ||
900 | log_dhcp_server(server, "NAK (0x%x)", be32toh(req->message->xid)); | |
901 | return DHCP_NAK; | |
bd57b450 | 902 | } |
2dead812 TG |
903 | |
904 | break; | |
905 | } | |
9a0f246f | 906 | |
500792d8 TG |
907 | case DHCP_RELEASE: { |
908 | int pool_offset; | |
909 | ||
910 | log_dhcp_server(server, "RELEASE (0x%x)", | |
911 | be32toh(req->message->xid)); | |
912 | ||
913 | if (!existing_lease) | |
914 | return 0; | |
915 | ||
916 | if (existing_lease->address != req->message->ciaddr) | |
917 | return 0; | |
918 | ||
919 | pool_offset = get_pool_offset(server, req->message->ciaddr); | |
920 | if (pool_offset < 0) | |
921 | return 0; | |
922 | ||
923 | if (server->bound_leases[pool_offset] == existing_lease) { | |
924 | server->bound_leases[pool_offset] = NULL; | |
925 | hashmap_remove(server->leases_by_client_id, existing_lease); | |
926 | dhcp_lease_free(existing_lease); | |
c3922c0c | 927 | } |
500792d8 | 928 | |
c3922c0c LP |
929 | return 0; |
930 | }} | |
4dc35568 TG |
931 | |
932 | return 0; | |
be077570 TG |
933 | } |
934 | ||
ff734080 TG |
935 | static int server_receive_message(sd_event_source *s, int fd, |
936 | uint32_t revents, void *userdata) { | |
be077570 | 937 | _cleanup_free_ DHCPMessage *message = NULL; |
3a864fe4 | 938 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))]; |
ff734080 TG |
939 | sd_dhcp_server *server = userdata; |
940 | struct iovec iov = {}; | |
941 | struct msghdr msg = { | |
942 | .msg_iov = &iov, | |
943 | .msg_iovlen = 1, | |
3a864fe4 TG |
944 | .msg_control = cmsgbuf, |
945 | .msg_controllen = sizeof(cmsgbuf), | |
ff734080 | 946 | }; |
3a864fe4 | 947 | struct cmsghdr *cmsg; |
4edc2c9b | 948 | ssize_t buflen, len; |
57027d03 | 949 | int r; |
ff734080 TG |
950 | |
951 | assert(server); | |
952 | ||
4edc2c9b LP |
953 | buflen = next_datagram_size_fd(fd); |
954 | if (buflen < 0) | |
955 | return buflen; | |
ff734080 | 956 | |
0d43d2fc | 957 | message = malloc(buflen); |
ff734080 TG |
958 | if (!message) |
959 | return -ENOMEM; | |
960 | ||
961 | iov.iov_base = message; | |
962 | iov.iov_len = buflen; | |
963 | ||
a38d9945 | 964 | len = recvmsg(fd, &msg, 0); |
0d43d2fc | 965 | if (len < 0) { |
4c701096 | 966 | if (IN_SET(errno, EAGAIN, EINTR)) |
0d43d2fc TG |
967 | return 0; |
968 | ||
969 | return -errno; | |
6408ba5f LP |
970 | } |
971 | if ((size_t)len < sizeof(DHCPMessage)) | |
be077570 | 972 | return 0; |
ff734080 | 973 | |
2a1288ff | 974 | CMSG_FOREACH(cmsg, &msg) { |
3a864fe4 TG |
975 | if (cmsg->cmsg_level == IPPROTO_IP && |
976 | cmsg->cmsg_type == IP_PKTINFO && | |
977 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) { | |
978 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg); | |
979 | ||
a6f1e036 TG |
980 | /* TODO figure out if this can be done as a filter on |
981 | * the socket, like for IPv6 */ | |
b3ec603c | 982 | if (server->ifindex != info->ipi_ifindex) |
3a864fe4 TG |
983 | return 0; |
984 | ||
985 | break; | |
986 | } | |
987 | } | |
988 | ||
57027d03 LP |
989 | r = dhcp_server_handle_message(server, message, (size_t) len); |
990 | if (r < 0) | |
991 | log_dhcp_server_errno(server, r, "Couldn't process incoming message: %m"); | |
992 | ||
993 | return 0; | |
ff734080 TG |
994 | } |
995 | ||
996 | int sd_dhcp_server_start(sd_dhcp_server *server) { | |
997 | int r; | |
998 | ||
999 | assert_return(server, -EINVAL); | |
1000 | assert_return(server->event, -EINVAL); | |
1001 | assert_return(!server->receive_message, -EBUSY); | |
cfcbb135 LP |
1002 | assert_return(server->fd_raw < 0, -EBUSY); |
1003 | assert_return(server->fd < 0, -EBUSY); | |
20af7091 | 1004 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH); |
ff734080 | 1005 | |
8de4a226 TG |
1006 | r = socket(AF_PACKET, SOCK_DGRAM | SOCK_NONBLOCK, 0); |
1007 | if (r < 0) { | |
1008 | r = -errno; | |
1009 | sd_dhcp_server_stop(server); | |
1010 | return r; | |
1011 | } | |
1012 | server->fd_raw = r; | |
1013 | ||
3e7b9f76 | 1014 | r = dhcp_network_bind_udp_socket(server->ifindex, INADDR_ANY, DHCP_PORT_SERVER); |
ff734080 TG |
1015 | if (r < 0) { |
1016 | sd_dhcp_server_stop(server); | |
1017 | return r; | |
1018 | } | |
1019 | server->fd = r; | |
1020 | ||
1021 | r = sd_event_add_io(server->event, &server->receive_message, | |
1022 | server->fd, EPOLLIN, | |
1023 | server_receive_message, server); | |
1024 | if (r < 0) { | |
1025 | sd_dhcp_server_stop(server); | |
1026 | return r; | |
1027 | } | |
1028 | ||
1029 | r = sd_event_source_set_priority(server->receive_message, | |
1030 | server->event_priority); | |
1031 | if (r < 0) { | |
1032 | sd_dhcp_server_stop(server); | |
1033 | return r; | |
1034 | } | |
1035 | ||
1036 | log_dhcp_server(server, "STARTED"); | |
1037 | ||
1038 | return 0; | |
1039 | } | |
52750344 TG |
1040 | |
1041 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { | |
1042 | unsigned i; | |
621ac3d2 | 1043 | int r = 0; |
52750344 TG |
1044 | |
1045 | assert_return(server, -EINVAL); | |
1046 | assert(server->bound_leases); | |
1047 | ||
1048 | for (i = 0; i < server->pool_size; i++) { | |
1049 | DHCPLease *lease = server->bound_leases[i]; | |
1050 | ||
99634696 | 1051 | if (!lease || lease == &server->invalid_lease) |
52750344 TG |
1052 | continue; |
1053 | ||
1054 | r = server_send_forcerenew(server, lease->address, | |
1055 | lease->gateway, | |
1056 | lease->chaddr); | |
1057 | if (r < 0) | |
1058 | return r; | |
6408ba5f LP |
1059 | |
1060 | log_dhcp_server(server, "FORCERENEW"); | |
52750344 TG |
1061 | } |
1062 | ||
1063 | return r; | |
1064 | } | |
8eb9058d | 1065 | |
64d6c229 | 1066 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { |
8eb9058d LP |
1067 | int r; |
1068 | ||
1069 | assert_return(server, -EINVAL); | |
089fb865 | 1070 | assert_return(timezone_is_valid(tz, LOG_DEBUG), -EINVAL); |
8eb9058d | 1071 | |
64d6c229 | 1072 | if (streq_ptr(tz, server->timezone)) |
8eb9058d LP |
1073 | return 0; |
1074 | ||
64d6c229 | 1075 | r = free_and_strdup(&server->timezone, tz); |
8eb9058d LP |
1076 | if (r < 0) |
1077 | return r; | |
1078 | ||
1079 | return 1; | |
1080 | } | |
586ac6f7 LP |
1081 | |
1082 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1083 | assert_return(server, -EINVAL); | |
1084 | ||
1085 | if (t == server->max_lease_time) | |
1086 | return 0; | |
1087 | ||
1088 | server->max_lease_time = t; | |
1089 | return 1; | |
1090 | } | |
1091 | ||
1092 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1093 | assert_return(server, -EINVAL); | |
1094 | ||
1095 | if (t == server->default_lease_time) | |
1096 | return 0; | |
1097 | ||
1098 | server->default_lease_time = t; | |
1099 | return 1; | |
1100 | } | |
1a04db0f LP |
1101 | |
1102 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], unsigned n) { | |
1103 | assert_return(server, -EINVAL); | |
1104 | assert_return(dns || n <= 0, -EINVAL); | |
1105 | ||
1106 | if (server->n_dns == n && | |
1107 | memcmp(server->dns, dns, sizeof(struct in_addr) * n) == 0) | |
1108 | return 0; | |
1109 | ||
1110 | if (n <= 0) { | |
1111 | server->dns = mfree(server->dns); | |
1112 | server->n_dns = 0; | |
1113 | } else { | |
1114 | struct in_addr *c; | |
1115 | ||
1116 | c = newdup(struct in_addr, dns, n); | |
1117 | if (!c) | |
1118 | return -ENOMEM; | |
1119 | ||
1120 | free(server->dns); | |
1121 | server->dns = c; | |
1122 | server->n_dns = n; | |
1123 | } | |
1124 | ||
1125 | return 1; | |
1126 | } | |
1127 | ||
1128 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], unsigned n) { | |
1129 | assert_return(server, -EINVAL); | |
1130 | assert_return(ntp || n <= 0, -EINVAL); | |
1131 | ||
1132 | if (server->n_ntp == n && | |
1133 | memcmp(server->ntp, ntp, sizeof(struct in_addr) * n) == 0) | |
1134 | return 0; | |
1135 | ||
1136 | if (n <= 0) { | |
1137 | server->ntp = mfree(server->ntp); | |
1138 | server->n_ntp = 0; | |
1139 | } else { | |
1140 | struct in_addr *c; | |
1141 | ||
1142 | c = newdup(struct in_addr, ntp, n); | |
1143 | if (!c) | |
1144 | return -ENOMEM; | |
1145 | ||
1146 | free(server->ntp); | |
1147 | server->ntp = c; | |
1148 | server->n_ntp = n; | |
1149 | } | |
1150 | ||
1151 | return 1; | |
1152 | } | |
77ff6022 CG |
1153 | |
1154 | int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled) { | |
1155 | assert_return(server, -EINVAL); | |
1156 | ||
1157 | if (enabled == server->emit_router) | |
1158 | return 0; | |
1159 | ||
1160 | server->emit_router = enabled; | |
1161 | ||
1162 | return 1; | |
1163 | } |