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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 | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
ff734080 TG |
22 | #include <sys/ioctl.h> |
23 | ||
b44cd882 | 24 | #include "sd-dhcp-server.h" |
07630cea | 25 | |
b5efdb8a | 26 | #include "alloc-util.h" |
ff734080 | 27 | #include "dhcp-internal.h" |
07630cea | 28 | #include "dhcp-server-internal.h" |
3ffd4af2 | 29 | #include "fd-util.h" |
07630cea | 30 | #include "in-addr-util.h" |
dccca82b | 31 | #include "sd-id128.h" |
07630cea LP |
32 | #include "siphash24.h" |
33 | #include "string-util.h" | |
9ae84244 | 34 | #include "unaligned.h" |
b44cd882 | 35 | |
586ac6f7 LP |
36 | #define DHCP_DEFAULT_LEASE_TIME_USEC USEC_PER_HOUR |
37 | #define DHCP_MAX_LEASE_TIME_USEC (USEC_PER_HOUR*12) | |
4dc35568 | 38 | |
45a9eac9 RM |
39 | static void dhcp_lease_free(DHCPLease *lease) { |
40 | if (!lease) | |
41 | return; | |
42 | ||
43 | free(lease->client_id.data); | |
44 | free(lease); | |
45 | } | |
46 | ||
99634696 TG |
47 | /* configures the server's address and subnet, and optionally the pool's size and offset into the subnet |
48 | * the whole pool must fit into the subnet, and may not contain the first (any) nor last (broadcast) address | |
49 | * moreover, the server's own address may be in the pool, and is in that case reserved in order not to | |
50 | * accidentally hand it out */ | |
51 | int sd_dhcp_server_configure_pool(sd_dhcp_server *server, struct in_addr *address, unsigned char prefixlen, uint32_t offset, uint32_t size) { | |
52 | struct in_addr netmask_addr; | |
53 | be32_t netmask; | |
54 | uint32_t server_off, broadcast_off, size_max; | |
55 | ||
2dead812 TG |
56 | assert_return(server, -EINVAL); |
57 | assert_return(address, -EINVAL); | |
99634696 TG |
58 | assert_return(address->s_addr != INADDR_ANY, -EINVAL); |
59 | assert_return(prefixlen <= 32, -ERANGE); | |
99634696 | 60 | |
5a941f5f | 61 | assert_se(in4_addr_prefixlen_to_netmask(&netmask_addr, prefixlen)); |
99634696 TG |
62 | netmask = netmask_addr.s_addr; |
63 | ||
64 | server_off = be32toh(address->s_addr & ~netmask); | |
65 | broadcast_off = be32toh(~netmask); | |
66 | ||
67 | /* the server address cannot be the subnet address */ | |
68 | assert_return(server_off != 0, -ERANGE); | |
69 | ||
70 | /* nor the broadcast address */ | |
71 | assert_return(server_off != broadcast_off, -ERANGE); | |
72 | ||
73 | /* 0 offset means we should set a default, we skip the first (subnet) address | |
74 | and take the next one */ | |
75 | if (offset == 0) | |
76 | offset = 1; | |
77 | ||
78 | size_max = (broadcast_off + 1) /* the number of addresses in the subnet */ | |
79 | - offset /* exclude the addresses before the offset */ | |
80 | - 1; /* exclude the last (broadcast) address */ | |
81 | ||
82 | /* The pool must contain at least one address */ | |
83 | assert_return(size_max >= 1, -ERANGE); | |
84 | ||
85 | if (size != 0) | |
86 | assert_return(size <= size_max, -ERANGE); | |
87 | else | |
88 | size = size_max; | |
87322b3a | 89 | |
45a9eac9 | 90 | if (server->address != address->s_addr || server->netmask != netmask || server->pool_size != size || server->pool_offset != offset) { |
45a9eac9 RM |
91 | |
92 | free(server->bound_leases); | |
93 | server->bound_leases = new0(DHCPLease*, size); | |
94 | if (!server->bound_leases) | |
95 | return -ENOMEM; | |
2dead812 | 96 | |
45a9eac9 RM |
97 | server->pool_offset = offset; |
98 | server->pool_size = size; | |
2dead812 | 99 | |
45a9eac9 RM |
100 | server->address = address->s_addr; |
101 | server->netmask = netmask; | |
102 | server->subnet = address->s_addr & netmask; | |
99634696 | 103 | |
45a9eac9 RM |
104 | if (server_off >= offset && server_off - offset < size) |
105 | server->bound_leases[server_off - offset] = &server->invalid_lease; | |
106 | ||
107 | /* Drop any leases associated with the old address range */ | |
224b0e7a | 108 | hashmap_clear_with_destructor(server->leases_by_client_id, dhcp_lease_free); |
45a9eac9 | 109 | } |
20af7091 TG |
110 | |
111 | return 0; | |
112 | } | |
113 | ||
04c01369 | 114 | int sd_dhcp_server_is_running(sd_dhcp_server *server) { |
75677581 | 115 | assert_return(server, false); |
7c16313f TG |
116 | |
117 | return !!server->receive_message; | |
118 | } | |
119 | ||
b44cd882 | 120 | sd_dhcp_server *sd_dhcp_server_ref(sd_dhcp_server *server) { |
3733eec3 LP |
121 | |
122 | if (!server) | |
123 | return NULL; | |
124 | ||
125 | assert(server->n_ref >= 1); | |
126 | server->n_ref++; | |
b44cd882 TG |
127 | |
128 | return server; | |
129 | } | |
130 | ||
b826ab58 | 131 | void client_id_hash_func(const void *p, struct siphash *state) { |
87322b3a TG |
132 | const DHCPClientId *id = p; |
133 | ||
134 | assert(id); | |
135 | assert(id->length); | |
136 | assert(id->data); | |
137 | ||
1e2527a6 | 138 | siphash24_compress(&id->length, sizeof(id->length), state); |
b826ab58 | 139 | siphash24_compress(id->data, id->length, state); |
87322b3a TG |
140 | } |
141 | ||
142 | int client_id_compare_func(const void *_a, const void *_b) { | |
143 | const DHCPClientId *a, *b; | |
144 | ||
145 | a = _a; | |
146 | b = _b; | |
147 | ||
148 | assert(!a->length || a->data); | |
149 | assert(!b->length || b->data); | |
150 | ||
151 | if (a->length != b->length) | |
152 | return a->length < b->length ? -1 : 1; | |
153 | ||
154 | return memcmp(a->data, b->data, a->length); | |
155 | } | |
156 | ||
d5099efc MS |
157 | static const struct hash_ops client_id_hash_ops = { |
158 | .hash = client_id_hash_func, | |
159 | .compare = client_id_compare_func | |
160 | }; | |
161 | ||
b44cd882 | 162 | sd_dhcp_server *sd_dhcp_server_unref(sd_dhcp_server *server) { |
3bdace9b | 163 | DHCPLease *lease; |
87322b3a | 164 | |
3bdace9b LP |
165 | if (!server) |
166 | return NULL; | |
b44cd882 | 167 | |
3733eec3 LP |
168 | assert(server->n_ref >= 1); |
169 | server->n_ref--; | |
170 | ||
171 | if (server->n_ref > 0) | |
3bdace9b | 172 | return NULL; |
ff734080 | 173 | |
3bdace9b | 174 | log_dhcp_server(server, "UNREF"); |
87322b3a | 175 | |
3bdace9b | 176 | sd_dhcp_server_stop(server); |
87322b3a | 177 | |
3bdace9b LP |
178 | sd_event_unref(server->event); |
179 | ||
8eb9058d | 180 | free(server->timezone); |
1a04db0f LP |
181 | free(server->dns); |
182 | free(server->ntp); | |
8eb9058d | 183 | |
3bdace9b LP |
184 | while ((lease = hashmap_steal_first(server->leases_by_client_id))) |
185 | dhcp_lease_free(lease); | |
186 | hashmap_free(server->leases_by_client_id); | |
187 | ||
188 | free(server->bound_leases); | |
6b430fdb | 189 | return mfree(server); |
b44cd882 TG |
190 | } |
191 | ||
3a864fe4 | 192 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
4afd3348 | 193 | _cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL; |
b44cd882 TG |
194 | |
195 | assert_return(ret, -EINVAL); | |
3a864fe4 | 196 | assert_return(ifindex > 0, -EINVAL); |
b44cd882 TG |
197 | |
198 | server = new0(sd_dhcp_server, 1); | |
199 | if (!server) | |
200 | return -ENOMEM; | |
201 | ||
3733eec3 | 202 | server->n_ref = 1; |
8de4a226 | 203 | server->fd_raw = -1; |
ff734080 | 204 | server->fd = -1; |
20af7091 | 205 | server->address = htobe32(INADDR_ANY); |
59b8f6b6 | 206 | server->netmask = htobe32(INADDR_ANY); |
b3ec603c | 207 | server->ifindex = ifindex; |
357e1b17 | 208 | |
d5099efc | 209 | server->leases_by_client_id = hashmap_new(&client_id_hash_ops); |
357e1b17 LP |
210 | if (!server->leases_by_client_id) |
211 | return -ENOMEM; | |
212 | ||
586ac6f7 LP |
213 | server->default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC); |
214 | server->max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC); | |
b44cd882 TG |
215 | |
216 | *ret = server; | |
217 | server = NULL; | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
32d20645 | 222 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int64_t priority) { |
b44cd882 TG |
223 | int r; |
224 | ||
225 | assert_return(server, -EINVAL); | |
226 | assert_return(!server->event, -EBUSY); | |
227 | ||
228 | if (event) | |
229 | server->event = sd_event_ref(event); | |
230 | else { | |
231 | r = sd_event_default(&server->event); | |
232 | if (r < 0) | |
233 | return r; | |
234 | } | |
235 | ||
236 | server->event_priority = priority; | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
242 | assert_return(server, -EINVAL); | |
243 | ||
244 | server->event = sd_event_unref(server->event); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | ||
249 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
250 | assert_return(server, NULL); | |
251 | ||
252 | return server->event; | |
253 | } | |
ff734080 TG |
254 | |
255 | int sd_dhcp_server_stop(sd_dhcp_server *server) { | |
256 | assert_return(server, -EINVAL); | |
257 | ||
258 | server->receive_message = | |
259 | sd_event_source_unref(server->receive_message); | |
260 | ||
8de4a226 | 261 | server->fd_raw = safe_close(server->fd_raw); |
ff734080 TG |
262 | server->fd = safe_close(server->fd); |
263 | ||
264 | log_dhcp_server(server, "STOPPED"); | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
a6f1e036 TG |
269 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
270 | DHCPPacket *packet, size_t len) { | |
969b009d TG |
271 | union sockaddr_union link = { |
272 | .ll.sll_family = AF_PACKET, | |
8e38570e | 273 | .ll.sll_protocol = htobe16(ETH_P_IP), |
b3ec603c | 274 | .ll.sll_ifindex = server->ifindex, |
969b009d TG |
275 | .ll.sll_halen = ETH_ALEN, |
276 | }; | |
969b009d TG |
277 | |
278 | assert(server); | |
b3ec603c | 279 | assert(server->ifindex > 0); |
969b009d TG |
280 | assert(server->address); |
281 | assert(packet); | |
282 | assert(len > sizeof(DHCPPacket)); | |
283 | ||
284 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN); | |
285 | ||
286 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, | |
a6f1e036 TG |
287 | packet->dhcp.yiaddr, |
288 | DHCP_PORT_CLIENT, len); | |
969b009d | 289 | |
b3ec603c | 290 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
969b009d TG |
291 | } |
292 | ||
293 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
8eb7b6a5 | 294 | uint16_t destination_port, |
969b009d TG |
295 | DHCPMessage *message, size_t len) { |
296 | union sockaddr_union dest = { | |
297 | .in.sin_family = AF_INET, | |
8eb7b6a5 | 298 | .in.sin_port = htobe16(destination_port), |
969b009d TG |
299 | .in.sin_addr.s_addr = destination, |
300 | }; | |
301 | struct iovec iov = { | |
302 | .iov_base = message, | |
303 | .iov_len = len, | |
304 | }; | |
305 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))] = {}; | |
306 | struct msghdr msg = { | |
307 | .msg_name = &dest, | |
308 | .msg_namelen = sizeof(dest.in), | |
309 | .msg_iov = &iov, | |
310 | .msg_iovlen = 1, | |
311 | .msg_control = cmsgbuf, | |
312 | .msg_controllen = sizeof(cmsgbuf), | |
313 | }; | |
314 | struct cmsghdr *cmsg; | |
315 | struct in_pktinfo *pktinfo; | |
316 | int r; | |
317 | ||
318 | assert(server); | |
4c9cb12c | 319 | assert(server->fd >= 0); |
969b009d TG |
320 | assert(message); |
321 | assert(len > sizeof(DHCPMessage)); | |
322 | ||
323 | cmsg = CMSG_FIRSTHDR(&msg); | |
324 | assert(cmsg); | |
325 | ||
326 | cmsg->cmsg_level = IPPROTO_IP; | |
327 | cmsg->cmsg_type = IP_PKTINFO; | |
328 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
329 | ||
330 | /* we attach source interface and address info to the message | |
331 | rather than binding the socket. This will be mostly useful | |
332 | when we gain support for arbitrary number of server addresses | |
333 | */ | |
334 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
335 | assert(pktinfo); | |
336 | ||
b3ec603c | 337 | pktinfo->ipi_ifindex = server->ifindex; |
969b009d TG |
338 | pktinfo->ipi_spec_dst.s_addr = server->address; |
339 | ||
340 | r = sendmsg(server->fd, &msg, 0); | |
341 | if (r < 0) | |
342 | return -errno; | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | static bool requested_broadcast(DHCPRequest *req) { | |
348 | assert(req); | |
349 | ||
350 | return req->message->flags & htobe16(0x8000); | |
351 | } | |
352 | ||
353 | int dhcp_server_send_packet(sd_dhcp_server *server, | |
354 | DHCPRequest *req, DHCPPacket *packet, | |
355 | int type, size_t optoffset) { | |
356 | be32_t destination = INADDR_ANY; | |
8eb7b6a5 | 357 | uint16_t destination_port = DHCP_PORT_CLIENT; |
969b009d TG |
358 | int r; |
359 | ||
360 | assert(server); | |
361 | assert(req); | |
362 | assert(req->max_optlen); | |
363 | assert(optoffset <= req->max_optlen); | |
364 | assert(packet); | |
365 | ||
366 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 367 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
969b009d TG |
368 | 4, &server->address); |
369 | if (r < 0) | |
370 | return r; | |
371 | ||
372 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 373 | SD_DHCP_OPTION_END, 0, NULL); |
969b009d TG |
374 | if (r < 0) |
375 | return r; | |
376 | ||
377 | /* RFC 2131 Section 4.1 | |
378 | ||
379 | If the ’giaddr’ field in a DHCP message from a client is non-zero, | |
380 | the server sends any return messages to the ’DHCP server’ port on the | |
381 | BOOTP relay agent whose address appears in ’giaddr’. If the ’giaddr’ | |
382 | field is zero and the ’ciaddr’ field is nonzero, then the server | |
383 | unicasts DHCPOFFER and DHCPACK messages to the address in ’ciaddr’. | |
384 | If ’giaddr’ is zero and ’ciaddr’ is zero, and the broadcast bit is | |
385 | set, then the server broadcasts DHCPOFFER and DHCPACK messages to | |
386 | 0xffffffff. If the broadcast bit is not set and ’giaddr’ is zero and | |
387 | ’ciaddr’ is zero, then the server unicasts DHCPOFFER and DHCPACK | |
388 | messages to the client’s hardware address and ’yiaddr’ address. In | |
389 | all cases, when ’giaddr’ is zero, the server broadcasts any DHCPNAK | |
390 | messages to 0xffffffff. | |
391 | ||
392 | Section 4.3.2 | |
393 | ||
394 | If ’giaddr’ is set in the DHCPREQUEST message, the client is on a | |
395 | different subnet. The server MUST set the broadcast bit in the | |
396 | DHCPNAK, so that the relay agent will broadcast the DHCPNAK to the | |
397 | client, because the client may not have a correct network address | |
398 | or subnet mask, and the client may not be answering ARP requests. | |
399 | */ | |
400 | if (req->message->giaddr) { | |
401 | destination = req->message->giaddr; | |
8eb7b6a5 | 402 | destination_port = DHCP_PORT_SERVER; |
969b009d TG |
403 | if (type == DHCP_NAK) |
404 | packet->dhcp.flags = htobe16(0x8000); | |
405 | } else if (req->message->ciaddr && type != DHCP_NAK) | |
406 | destination = req->message->ciaddr; | |
407 | ||
d6bd972d | 408 | if (destination != INADDR_ANY) |
8eb7b6a5 PF |
409 | return dhcp_server_send_udp(server, destination, |
410 | destination_port, &packet->dhcp, | |
969b009d | 411 | sizeof(DHCPMessage) + optoffset); |
d6bd972d | 412 | else if (requested_broadcast(req) || type == DHCP_NAK) |
a6f1e036 | 413 | return dhcp_server_send_udp(server, INADDR_BROADCAST, |
8eb7b6a5 | 414 | destination_port, &packet->dhcp, |
d6bd972d | 415 | sizeof(DHCPMessage) + optoffset); |
969b009d | 416 | else |
a6f1e036 TG |
417 | /* we cannot send UDP packet to specific MAC address when the |
418 | address is not yet configured, so must fall back to raw | |
419 | packets */ | |
969b009d TG |
420 | return dhcp_server_send_unicast_raw(server, packet, |
421 | sizeof(DHCPPacket) + optoffset); | |
422 | } | |
423 | ||
4dc35568 | 424 | static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret, |
a6f1e036 TG |
425 | uint8_t type, size_t *_optoffset, |
426 | DHCPRequest *req) { | |
4dc35568 | 427 | _cleanup_free_ DHCPPacket *packet = NULL; |
1231c4d2 | 428 | size_t optoffset = 0; |
4dc35568 TG |
429 | int r; |
430 | ||
431 | assert(server); | |
432 | assert(ret); | |
433 | assert(_optoffset); | |
bd57b450 | 434 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)); |
4dc35568 TG |
435 | |
436 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen); | |
437 | if (!packet) | |
438 | return -ENOMEM; | |
439 | ||
a6f1e036 | 440 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
76253e73 DW |
441 | be32toh(req->message->xid), type, ARPHRD_ETHER, |
442 | req->max_optlen, &optoffset); | |
4dc35568 TG |
443 | if (r < 0) |
444 | return r; | |
445 | ||
446 | packet->dhcp.flags = req->message->flags; | |
447 | packet->dhcp.giaddr = req->message->giaddr; | |
448 | memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN); | |
449 | ||
450 | *_optoffset = optoffset; | |
451 | *ret = packet; | |
452 | packet = NULL; | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
a6f1e036 TG |
457 | static int server_send_offer(sd_dhcp_server *server, DHCPRequest *req, |
458 | be32_t address) { | |
4dc35568 TG |
459 | _cleanup_free_ DHCPPacket *packet = NULL; |
460 | size_t offset; | |
461 | be32_t lease_time; | |
462 | int r; | |
463 | ||
464 | r = server_message_init(server, &packet, DHCP_OFFER, &offset, req); | |
465 | if (r < 0) | |
466 | return r; | |
467 | ||
2dead812 | 468 | packet->dhcp.yiaddr = address; |
4dc35568 | 469 | |
c7d9ffe6 | 470 | lease_time = htobe32(req->lifetime); |
4dc35568 | 471 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 472 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 473 | &lease_time); |
4dc35568 TG |
474 | if (r < 0) |
475 | return r; | |
476 | ||
59b8f6b6 | 477 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 478 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
479 | if (r < 0) |
480 | return r; | |
481 | ||
77ff6022 CG |
482 | if (server->emit_router) { |
483 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
484 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
485 | if (r < 0) | |
486 | return r; | |
487 | } | |
59b8f6b6 | 488 | |
4dc35568 TG |
489 | r = dhcp_server_send_packet(server, req, packet, DHCP_OFFER, offset); |
490 | if (r < 0) | |
491 | return r; | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
a6f1e036 TG |
496 | static int server_send_ack(sd_dhcp_server *server, DHCPRequest *req, |
497 | be32_t address) { | |
2dead812 TG |
498 | _cleanup_free_ DHCPPacket *packet = NULL; |
499 | size_t offset; | |
500 | be32_t lease_time; | |
501 | int r; | |
502 | ||
503 | r = server_message_init(server, &packet, DHCP_ACK, &offset, req); | |
504 | if (r < 0) | |
505 | return r; | |
506 | ||
507 | packet->dhcp.yiaddr = address; | |
508 | ||
c7d9ffe6 | 509 | lease_time = htobe32(req->lifetime); |
2dead812 | 510 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 511 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 512 | &lease_time); |
2dead812 TG |
513 | if (r < 0) |
514 | return r; | |
515 | ||
59b8f6b6 | 516 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 517 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
518 | if (r < 0) |
519 | return r; | |
520 | ||
77ff6022 CG |
521 | if (server->emit_router) { |
522 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
523 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
524 | if (r < 0) | |
525 | return r; | |
526 | } | |
59b8f6b6 | 527 | |
1a04db0f LP |
528 | if (server->n_dns > 0) { |
529 | r = dhcp_option_append( | |
530 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 531 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, |
1a04db0f LP |
532 | sizeof(struct in_addr) * server->n_dns, server->dns); |
533 | if (r < 0) | |
534 | return r; | |
535 | } | |
536 | ||
537 | if (server->n_ntp > 0) { | |
538 | r = dhcp_option_append( | |
539 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 540 | SD_DHCP_OPTION_NTP_SERVER, |
1a04db0f LP |
541 | sizeof(struct in_addr) * server->n_ntp, server->ntp); |
542 | if (r < 0) | |
543 | return r; | |
544 | } | |
545 | ||
8eb9058d LP |
546 | if (server->timezone) { |
547 | r = dhcp_option_append( | |
548 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 549 | SD_DHCP_OPTION_NEW_TZDB_TIMEZONE, |
8eb9058d LP |
550 | strlen(server->timezone), server->timezone); |
551 | if (r < 0) | |
552 | return r; | |
553 | } | |
554 | ||
2dead812 TG |
555 | r = dhcp_server_send_packet(server, req, packet, DHCP_ACK, offset); |
556 | if (r < 0) | |
557 | return r; | |
558 | ||
559 | return 0; | |
560 | } | |
561 | ||
bd57b450 TG |
562 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { |
563 | _cleanup_free_ DHCPPacket *packet = NULL; | |
564 | size_t offset; | |
565 | int r; | |
566 | ||
567 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); | |
568 | if (r < 0) | |
569 | return r; | |
570 | ||
b3ec603c | 571 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
bd57b450 TG |
572 | } |
573 | ||
a6f1e036 TG |
574 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
575 | be32_t gateway, uint8_t chaddr[]) { | |
52750344 TG |
576 | _cleanup_free_ DHCPPacket *packet = NULL; |
577 | size_t optoffset = 0; | |
578 | int r; | |
579 | ||
580 | assert(server); | |
581 | assert(address != INADDR_ANY); | |
582 | assert(chaddr); | |
583 | ||
584 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
585 | if (!packet) | |
586 | return -ENOMEM; | |
587 | ||
588 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
76253e73 DW |
589 | DHCP_FORCERENEW, ARPHRD_ETHER, |
590 | DHCP_MIN_OPTIONS_SIZE, &optoffset); | |
52750344 TG |
591 | if (r < 0) |
592 | return r; | |
593 | ||
594 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
22805d92 | 595 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL); |
52750344 TG |
596 | if (r < 0) |
597 | return r; | |
598 | ||
599 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); | |
600 | ||
8eb7b6a5 PF |
601 | r = dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, |
602 | &packet->dhcp, | |
52750344 | 603 | sizeof(DHCPMessage) + optoffset); |
c15fb62a TA |
604 | if (r < 0) |
605 | return r; | |
52750344 TG |
606 | |
607 | return 0; | |
608 | } | |
609 | ||
b3ec603c | 610 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
89ca10c6 | 611 | DHCPRequest *req = userdata; |
816e2e7a TG |
612 | |
613 | assert(req); | |
614 | ||
615 | switch(code) { | |
22805d92 | 616 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
c7d9ffe6 | 617 | if (len == 4) |
9ae84244 | 618 | req->lifetime = unaligned_read_be32(option); |
c7d9ffe6 TG |
619 | |
620 | break; | |
22805d92 | 621 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
2dead812 | 622 | if (len == 4) |
9ae84244 | 623 | memcpy(&req->requested_ip, option, sizeof(be32_t)); |
2dead812 TG |
624 | |
625 | break; | |
22805d92 | 626 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
816e2e7a | 627 | if (len == 4) |
9ae84244 | 628 | memcpy(&req->server_id, option, sizeof(be32_t)); |
816e2e7a TG |
629 | |
630 | break; | |
22805d92 | 631 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
816e2e7a TG |
632 | if (len >= 2) { |
633 | uint8_t *data; | |
634 | ||
635 | data = memdup(option, len); | |
636 | if (!data) | |
637 | return -ENOMEM; | |
638 | ||
639 | free(req->client_id.data); | |
640 | req->client_id.data = data; | |
641 | req->client_id.length = len; | |
642 | } | |
643 | ||
644 | break; | |
22805d92 | 645 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
76a9d0f1 LP |
646 | |
647 | if (len == 2 && unaligned_read_be16(option) >= sizeof(DHCPPacket)) | |
9ae84244 | 648 | req->max_optlen = unaligned_read_be16(option) - sizeof(DHCPPacket); |
816e2e7a TG |
649 | |
650 | break; | |
651 | } | |
652 | ||
653 | return 0; | |
654 | } | |
655 | ||
656 | static void dhcp_request_free(DHCPRequest *req) { | |
657 | if (!req) | |
658 | return; | |
659 | ||
660 | free(req->client_id.data); | |
661 | free(req); | |
662 | } | |
663 | ||
664 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
665 | #define _cleanup_dhcp_request_free_ _cleanup_(dhcp_request_freep) | |
666 | ||
586ac6f7 | 667 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
816e2e7a TG |
668 | assert(req); |
669 | assert(message); | |
670 | ||
671 | req->message = message; | |
672 | ||
e2acdb6b | 673 | /* set client id based on MAC address if client did not send an explicit |
a6f1e036 | 674 | one */ |
816e2e7a | 675 | if (!req->client_id.data) { |
9a0f246f | 676 | void *data; |
816e2e7a | 677 | |
9a0f246f | 678 | data = malloc0(ETH_ALEN + 1); |
816e2e7a TG |
679 | if (!data) |
680 | return -ENOMEM; | |
681 | ||
9a0f246f LP |
682 | ((uint8_t*) data)[0] = 0x01; |
683 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN); | |
684 | ||
816e2e7a TG |
685 | req->client_id.length = ETH_ALEN + 1; |
686 | req->client_id.data = data; | |
816e2e7a TG |
687 | } |
688 | ||
689 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) | |
690 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
691 | ||
9a0f246f | 692 | if (req->lifetime <= 0) |
586ac6f7 LP |
693 | req->lifetime = MAX(1ULL, server->default_lease_time); |
694 | ||
695 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
696 | req->lifetime = server->max_lease_time; | |
c7d9ffe6 | 697 | |
816e2e7a TG |
698 | return 0; |
699 | } | |
700 | ||
87322b3a TG |
701 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { |
702 | assert(server); | |
703 | ||
704 | if (!server->pool_size) | |
705 | return -EINVAL; | |
706 | ||
99634696 TG |
707 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
708 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
709 | return -ERANGE; | |
87322b3a | 710 | |
99634696 | 711 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
87322b3a TG |
712 | } |
713 | ||
83cedf7a TG |
714 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
715 | ||
be077570 TG |
716 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, |
717 | size_t length) { | |
816e2e7a | 718 | _cleanup_dhcp_request_free_ DHCPRequest *req = NULL; |
f693e9b3 | 719 | _cleanup_free_ char *error_message = NULL; |
87322b3a | 720 | DHCPLease *existing_lease; |
816e2e7a | 721 | int type, r; |
be077570 TG |
722 | |
723 | assert(server); | |
724 | assert(message); | |
725 | ||
726 | if (message->op != BOOTREQUEST || | |
727 | message->htype != ARPHRD_ETHER || | |
728 | message->hlen != ETHER_ADDR_LEN) | |
729 | return 0; | |
730 | ||
816e2e7a TG |
731 | req = new0(DHCPRequest, 1); |
732 | if (!req) | |
733 | return -ENOMEM; | |
734 | ||
f693e9b3 | 735 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
be077570 TG |
736 | if (type < 0) |
737 | return 0; | |
738 | ||
586ac6f7 | 739 | r = ensure_sane_request(server, req, message); |
816e2e7a TG |
740 | if (r < 0) |
741 | /* this only fails on critical errors */ | |
742 | return r; | |
743 | ||
a6f1e036 TG |
744 | existing_lease = hashmap_get(server->leases_by_client_id, |
745 | &req->client_id); | |
87322b3a | 746 | |
4dc35568 | 747 | switch(type) { |
9a0f246f LP |
748 | |
749 | case DHCP_DISCOVER: { | |
87322b3a TG |
750 | be32_t address = INADDR_ANY; |
751 | unsigned i; | |
2dead812 | 752 | |
4dc35568 TG |
753 | log_dhcp_server(server, "DISCOVER (0x%x)", |
754 | be32toh(req->message->xid)); | |
755 | ||
2dead812 TG |
756 | if (!server->pool_size) |
757 | /* no pool allocated */ | |
758 | return 0; | |
759 | ||
87322b3a TG |
760 | /* for now pick a random free address from the pool */ |
761 | if (existing_lease) | |
762 | address = existing_lease->address; | |
763 | else { | |
b826ab58 | 764 | struct siphash state; |
0cb3c286 | 765 | uint64_t hash; |
99634696 | 766 | uint32_t next_offer; |
83cedf7a TG |
767 | |
768 | /* even with no persistence of leases, we try to offer the same client | |
769 | the same IP address. we do this by using the hash of the client id | |
770 | as the offset into the pool of leases when finding the next free one */ | |
771 | ||
0cb3c286 | 772 | siphash24_init(&state, HASH_KEY.bytes); |
b826ab58 | 773 | client_id_hash_func(&req->client_id, &state); |
933f9cae | 774 | hash = htole64(siphash24_finalize(&state)); |
0cb3c286 | 775 | next_offer = hash % server->pool_size; |
83cedf7a | 776 | |
87322b3a | 777 | for (i = 0; i < server->pool_size; i++) { |
83cedf7a | 778 | if (!server->bound_leases[next_offer]) { |
99634696 | 779 | address = server->subnet | htobe32(server->pool_offset + next_offer); |
87322b3a TG |
780 | break; |
781 | } else | |
83cedf7a | 782 | next_offer = (next_offer + 1) % server->pool_size; |
87322b3a TG |
783 | } |
784 | } | |
785 | ||
786 | if (address == INADDR_ANY) | |
787 | /* no free addresses left */ | |
788 | return 0; | |
2dead812 TG |
789 | |
790 | r = server_send_offer(server, req, address); | |
4dc35568 TG |
791 | if (r < 0) { |
792 | /* this only fails on critical errors */ | |
793 | log_dhcp_server(server, "could not send offer: %s", | |
794 | strerror(-r)); | |
795 | return r; | |
796 | } else { | |
797 | log_dhcp_server(server, "OFFER (0x%x)", | |
798 | be32toh(req->message->xid)); | |
799 | return DHCP_OFFER; | |
800 | } | |
be077570 | 801 | |
4dc35568 TG |
802 | break; |
803 | } | |
5b34277c | 804 | case DHCP_DECLINE: |
f693e9b3 | 805 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message)); |
5b34277c TG |
806 | |
807 | /* TODO: make sure we don't offer this address again */ | |
808 | ||
809 | return 1; | |
810 | ||
9a0f246f | 811 | case DHCP_REQUEST: { |
2dead812 | 812 | be32_t address; |
bd57b450 | 813 | bool init_reboot = false; |
87322b3a | 814 | int pool_offset; |
2dead812 TG |
815 | |
816 | /* see RFC 2131, section 4.3.2 */ | |
817 | ||
818 | if (req->server_id) { | |
819 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", | |
820 | be32toh(req->message->xid)); | |
821 | ||
822 | /* SELECTING */ | |
823 | if (req->server_id != server->address) | |
824 | /* client did not pick us */ | |
825 | return 0; | |
826 | ||
827 | if (req->message->ciaddr) | |
828 | /* this MUST be zero */ | |
829 | return 0; | |
830 | ||
831 | if (!req->requested_ip) | |
832 | /* this must be filled in with the yiaddr | |
833 | from the chosen OFFER */ | |
834 | return 0; | |
835 | ||
836 | address = req->requested_ip; | |
837 | } else if (req->requested_ip) { | |
838 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", | |
839 | be32toh(req->message->xid)); | |
840 | ||
841 | /* INIT-REBOOT */ | |
842 | if (req->message->ciaddr) | |
843 | /* this MUST be zero */ | |
844 | return 0; | |
845 | ||
bd57b450 | 846 | /* TODO: check more carefully if IP is correct */ |
2dead812 | 847 | address = req->requested_ip; |
bd57b450 | 848 | init_reboot = true; |
2dead812 TG |
849 | } else { |
850 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
851 | be32toh(req->message->xid)); | |
852 | ||
853 | /* REBINDING / RENEWING */ | |
854 | if (!req->message->ciaddr) | |
855 | /* this MUST be filled in with clients IP address */ | |
856 | return 0; | |
857 | ||
858 | address = req->message->ciaddr; | |
859 | } | |
860 | ||
87322b3a TG |
861 | pool_offset = get_pool_offset(server, address); |
862 | ||
863 | /* verify that the requested address is from the pool, and either | |
864 | owned by the current client or free */ | |
865 | if (pool_offset >= 0 && | |
866 | server->bound_leases[pool_offset] == existing_lease) { | |
867 | DHCPLease *lease; | |
a7f7d1bd | 868 | usec_t time_now = 0; |
87322b3a TG |
869 | |
870 | if (!existing_lease) { | |
871 | lease = new0(DHCPLease, 1); | |
357e1b17 LP |
872 | if (!lease) |
873 | return -ENOMEM; | |
28c78e07 | 874 | lease->address = address; |
87322b3a TG |
875 | lease->client_id.data = memdup(req->client_id.data, |
876 | req->client_id.length); | |
02557f97 TA |
877 | if (!lease->client_id.data) { |
878 | free(lease); | |
87322b3a | 879 | return -ENOMEM; |
02557f97 | 880 | } |
87322b3a | 881 | lease->client_id.length = req->client_id.length; |
a6f1e036 TG |
882 | memcpy(&lease->chaddr, &req->message->chaddr, |
883 | ETH_ALEN); | |
52750344 | 884 | lease->gateway = req->message->giaddr; |
87322b3a TG |
885 | } else |
886 | lease = existing_lease; | |
887 | ||
a6f1e036 TG |
888 | r = sd_event_now(server->event, |
889 | clock_boottime_or_monotonic(), | |
890 | &time_now); | |
bff92d2c SS |
891 | if (r < 0) { |
892 | if (!existing_lease) | |
893 | dhcp_lease_free(lease); | |
38a03f06 | 894 | return r; |
bff92d2c SS |
895 | } |
896 | ||
87322b3a TG |
897 | lease->expiration = req->lifetime * USEC_PER_SEC + time_now; |
898 | ||
2dead812 TG |
899 | r = server_send_ack(server, req, address); |
900 | if (r < 0) { | |
901 | /* this only fails on critical errors */ | |
902 | log_dhcp_server(server, "could not send ack: %s", | |
903 | strerror(-r)); | |
87322b3a TG |
904 | |
905 | if (!existing_lease) | |
906 | dhcp_lease_free(lease); | |
907 | ||
2dead812 TG |
908 | return r; |
909 | } else { | |
910 | log_dhcp_server(server, "ACK (0x%x)", | |
911 | be32toh(req->message->xid)); | |
87322b3a TG |
912 | |
913 | server->bound_leases[pool_offset] = lease; | |
a6f1e036 TG |
914 | hashmap_put(server->leases_by_client_id, |
915 | &lease->client_id, lease); | |
87322b3a | 916 | |
2dead812 TG |
917 | return DHCP_ACK; |
918 | } | |
bd57b450 TG |
919 | } else if (init_reboot) { |
920 | r = server_send_nak(server, req); | |
921 | if (r < 0) { | |
922 | /* this only fails on critical errors */ | |
923 | log_dhcp_server(server, "could not send nak: %s", | |
924 | strerror(-r)); | |
925 | return r; | |
926 | } else { | |
927 | log_dhcp_server(server, "NAK (0x%x)", | |
928 | be32toh(req->message->xid)); | |
929 | return DHCP_NAK; | |
930 | } | |
931 | } | |
2dead812 TG |
932 | |
933 | break; | |
934 | } | |
9a0f246f | 935 | |
500792d8 TG |
936 | case DHCP_RELEASE: { |
937 | int pool_offset; | |
938 | ||
939 | log_dhcp_server(server, "RELEASE (0x%x)", | |
940 | be32toh(req->message->xid)); | |
941 | ||
942 | if (!existing_lease) | |
943 | return 0; | |
944 | ||
945 | if (existing_lease->address != req->message->ciaddr) | |
946 | return 0; | |
947 | ||
948 | pool_offset = get_pool_offset(server, req->message->ciaddr); | |
949 | if (pool_offset < 0) | |
950 | return 0; | |
951 | ||
952 | if (server->bound_leases[pool_offset] == existing_lease) { | |
953 | server->bound_leases[pool_offset] = NULL; | |
954 | hashmap_remove(server->leases_by_client_id, existing_lease); | |
955 | dhcp_lease_free(existing_lease); | |
956 | ||
957 | return 1; | |
958 | } else | |
959 | return 0; | |
960 | } | |
2dead812 | 961 | } |
4dc35568 TG |
962 | |
963 | return 0; | |
be077570 TG |
964 | } |
965 | ||
ff734080 TG |
966 | static int server_receive_message(sd_event_source *s, int fd, |
967 | uint32_t revents, void *userdata) { | |
be077570 | 968 | _cleanup_free_ DHCPMessage *message = NULL; |
3a864fe4 | 969 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))]; |
ff734080 TG |
970 | sd_dhcp_server *server = userdata; |
971 | struct iovec iov = {}; | |
972 | struct msghdr msg = { | |
973 | .msg_iov = &iov, | |
974 | .msg_iovlen = 1, | |
3a864fe4 TG |
975 | .msg_control = cmsgbuf, |
976 | .msg_controllen = sizeof(cmsgbuf), | |
ff734080 | 977 | }; |
3a864fe4 | 978 | struct cmsghdr *cmsg; |
4edc2c9b | 979 | ssize_t buflen, len; |
ff734080 TG |
980 | |
981 | assert(server); | |
982 | ||
4edc2c9b LP |
983 | buflen = next_datagram_size_fd(fd); |
984 | if (buflen < 0) | |
985 | return buflen; | |
ff734080 | 986 | |
0d43d2fc | 987 | message = malloc(buflen); |
ff734080 TG |
988 | if (!message) |
989 | return -ENOMEM; | |
990 | ||
991 | iov.iov_base = message; | |
992 | iov.iov_len = buflen; | |
993 | ||
a38d9945 | 994 | len = recvmsg(fd, &msg, 0); |
0d43d2fc | 995 | if (len < 0) { |
4c701096 | 996 | if (IN_SET(errno, EAGAIN, EINTR)) |
0d43d2fc TG |
997 | return 0; |
998 | ||
999 | return -errno; | |
1000 | } else if ((size_t)len < sizeof(DHCPMessage)) | |
be077570 | 1001 | return 0; |
ff734080 | 1002 | |
2a1288ff | 1003 | CMSG_FOREACH(cmsg, &msg) { |
3a864fe4 TG |
1004 | if (cmsg->cmsg_level == IPPROTO_IP && |
1005 | cmsg->cmsg_type == IP_PKTINFO && | |
1006 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) { | |
1007 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg); | |
1008 | ||
a6f1e036 TG |
1009 | /* TODO figure out if this can be done as a filter on |
1010 | * the socket, like for IPv6 */ | |
b3ec603c | 1011 | if (server->ifindex != info->ipi_ifindex) |
3a864fe4 TG |
1012 | return 0; |
1013 | ||
1014 | break; | |
1015 | } | |
1016 | } | |
1017 | ||
be077570 | 1018 | return dhcp_server_handle_message(server, message, (size_t)len); |
ff734080 TG |
1019 | } |
1020 | ||
1021 | int sd_dhcp_server_start(sd_dhcp_server *server) { | |
1022 | int r; | |
1023 | ||
1024 | assert_return(server, -EINVAL); | |
1025 | assert_return(server->event, -EINVAL); | |
1026 | assert_return(!server->receive_message, -EBUSY); | |
8de4a226 | 1027 | assert_return(server->fd_raw == -1, -EBUSY); |
ff734080 | 1028 | assert_return(server->fd == -1, -EBUSY); |
20af7091 | 1029 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH); |
ff734080 | 1030 | |
8de4a226 TG |
1031 | r = socket(AF_PACKET, SOCK_DGRAM | SOCK_NONBLOCK, 0); |
1032 | if (r < 0) { | |
1033 | r = -errno; | |
1034 | sd_dhcp_server_stop(server); | |
1035 | return r; | |
1036 | } | |
1037 | server->fd_raw = r; | |
1038 | ||
3e7b9f76 | 1039 | r = dhcp_network_bind_udp_socket(server->ifindex, INADDR_ANY, DHCP_PORT_SERVER); |
ff734080 TG |
1040 | if (r < 0) { |
1041 | sd_dhcp_server_stop(server); | |
1042 | return r; | |
1043 | } | |
1044 | server->fd = r; | |
1045 | ||
1046 | r = sd_event_add_io(server->event, &server->receive_message, | |
1047 | server->fd, EPOLLIN, | |
1048 | server_receive_message, server); | |
1049 | if (r < 0) { | |
1050 | sd_dhcp_server_stop(server); | |
1051 | return r; | |
1052 | } | |
1053 | ||
1054 | r = sd_event_source_set_priority(server->receive_message, | |
1055 | server->event_priority); | |
1056 | if (r < 0) { | |
1057 | sd_dhcp_server_stop(server); | |
1058 | return r; | |
1059 | } | |
1060 | ||
1061 | log_dhcp_server(server, "STARTED"); | |
1062 | ||
1063 | return 0; | |
1064 | } | |
52750344 TG |
1065 | |
1066 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { | |
1067 | unsigned i; | |
621ac3d2 | 1068 | int r = 0; |
52750344 TG |
1069 | |
1070 | assert_return(server, -EINVAL); | |
1071 | assert(server->bound_leases); | |
1072 | ||
1073 | for (i = 0; i < server->pool_size; i++) { | |
1074 | DHCPLease *lease = server->bound_leases[i]; | |
1075 | ||
99634696 | 1076 | if (!lease || lease == &server->invalid_lease) |
52750344 TG |
1077 | continue; |
1078 | ||
1079 | r = server_send_forcerenew(server, lease->address, | |
1080 | lease->gateway, | |
1081 | lease->chaddr); | |
1082 | if (r < 0) | |
1083 | return r; | |
1084 | else | |
1085 | log_dhcp_server(server, "FORCERENEW"); | |
1086 | } | |
1087 | ||
1088 | return r; | |
1089 | } | |
8eb9058d | 1090 | |
64d6c229 | 1091 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { |
8eb9058d LP |
1092 | int r; |
1093 | ||
1094 | assert_return(server, -EINVAL); | |
64d6c229 | 1095 | assert_return(timezone_is_valid(tz), -EINVAL); |
8eb9058d | 1096 | |
64d6c229 | 1097 | if (streq_ptr(tz, server->timezone)) |
8eb9058d LP |
1098 | return 0; |
1099 | ||
64d6c229 | 1100 | r = free_and_strdup(&server->timezone, tz); |
8eb9058d LP |
1101 | if (r < 0) |
1102 | return r; | |
1103 | ||
1104 | return 1; | |
1105 | } | |
586ac6f7 LP |
1106 | |
1107 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1108 | assert_return(server, -EINVAL); | |
1109 | ||
1110 | if (t == server->max_lease_time) | |
1111 | return 0; | |
1112 | ||
1113 | server->max_lease_time = t; | |
1114 | return 1; | |
1115 | } | |
1116 | ||
1117 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1118 | assert_return(server, -EINVAL); | |
1119 | ||
1120 | if (t == server->default_lease_time) | |
1121 | return 0; | |
1122 | ||
1123 | server->default_lease_time = t; | |
1124 | return 1; | |
1125 | } | |
1a04db0f LP |
1126 | |
1127 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], unsigned n) { | |
1128 | assert_return(server, -EINVAL); | |
1129 | assert_return(dns || n <= 0, -EINVAL); | |
1130 | ||
1131 | if (server->n_dns == n && | |
1132 | memcmp(server->dns, dns, sizeof(struct in_addr) * n) == 0) | |
1133 | return 0; | |
1134 | ||
1135 | if (n <= 0) { | |
1136 | server->dns = mfree(server->dns); | |
1137 | server->n_dns = 0; | |
1138 | } else { | |
1139 | struct in_addr *c; | |
1140 | ||
1141 | c = newdup(struct in_addr, dns, n); | |
1142 | if (!c) | |
1143 | return -ENOMEM; | |
1144 | ||
1145 | free(server->dns); | |
1146 | server->dns = c; | |
1147 | server->n_dns = n; | |
1148 | } | |
1149 | ||
1150 | return 1; | |
1151 | } | |
1152 | ||
1153 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], unsigned n) { | |
1154 | assert_return(server, -EINVAL); | |
1155 | assert_return(ntp || n <= 0, -EINVAL); | |
1156 | ||
1157 | if (server->n_ntp == n && | |
1158 | memcmp(server->ntp, ntp, sizeof(struct in_addr) * n) == 0) | |
1159 | return 0; | |
1160 | ||
1161 | if (n <= 0) { | |
1162 | server->ntp = mfree(server->ntp); | |
1163 | server->n_ntp = 0; | |
1164 | } else { | |
1165 | struct in_addr *c; | |
1166 | ||
1167 | c = newdup(struct in_addr, ntp, n); | |
1168 | if (!c) | |
1169 | return -ENOMEM; | |
1170 | ||
1171 | free(server->ntp); | |
1172 | server->ntp = c; | |
1173 | server->n_ntp = n; | |
1174 | } | |
1175 | ||
1176 | return 1; | |
1177 | } | |
77ff6022 CG |
1178 | |
1179 | int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled) { | |
1180 | assert_return(server, -EINVAL); | |
1181 | ||
1182 | if (enabled == server->emit_router) | |
1183 | return 0; | |
1184 | ||
1185 | server->emit_router = enabled; | |
1186 | ||
1187 | return 1; | |
1188 | } |