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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
b44cd882 | 2 | /*** |
810adae9 | 3 | Copyright © 2013 Intel Corporation. All rights reserved. |
b44cd882 TG |
4 | ***/ |
5 | ||
ddb82ec2 | 6 | #include <net/if_arp.h> |
ff734080 TG |
7 | #include <sys/ioctl.h> |
8 | ||
b44cd882 | 9 | #include "sd-dhcp-server.h" |
6e86b24d | 10 | #include "sd-id128.h" |
07630cea | 11 | |
b5efdb8a | 12 | #include "alloc-util.h" |
ff734080 | 13 | #include "dhcp-internal.h" |
07630cea | 14 | #include "dhcp-server-internal.h" |
6278e428 | 15 | #include "dns-domain.h" |
3ffd4af2 | 16 | #include "fd-util.h" |
07630cea | 17 | #include "in-addr-util.h" |
cb310866 | 18 | #include "io-util.h" |
54d95d02 | 19 | #include "memory-util.h" |
61a9fa8f | 20 | #include "network-common.h" |
ebffea2a | 21 | #include "ordered-set.h" |
07630cea LP |
22 | #include "siphash24.h" |
23 | #include "string-util.h" | |
9ae84244 | 24 | #include "unaligned.h" |
d5e5cd5c | 25 | #include "utf8.h" |
b44cd882 | 26 | |
586ac6f7 LP |
27 | #define DHCP_DEFAULT_LEASE_TIME_USEC USEC_PER_HOUR |
28 | #define DHCP_MAX_LEASE_TIME_USEC (USEC_PER_HOUR*12) | |
4dc35568 | 29 | |
6121fc30 | 30 | static DHCPLease *dhcp_lease_free(DHCPLease *lease) { |
45a9eac9 | 31 | if (!lease) |
6121fc30 | 32 | return NULL; |
45a9eac9 | 33 | |
b713a99b | 34 | if (lease->server) { |
8a7d048d YW |
35 | hashmap_remove_value(lease->server->bound_leases_by_address, UINT32_TO_PTR(lease->address), lease); |
36 | hashmap_remove_value(lease->server->bound_leases_by_client_id, &lease->client_id, lease); | |
37 | hashmap_remove_value(lease->server->static_leases_by_address, UINT32_TO_PTR(lease->address), lease); | |
38 | hashmap_remove_value(lease->server->static_leases_by_client_id, &lease->client_id, lease); | |
b713a99b YW |
39 | } |
40 | ||
45a9eac9 | 41 | free(lease->client_id.data); |
6121fc30 | 42 | return mfree(lease); |
45a9eac9 RM |
43 | } |
44 | ||
65a0ef23 | 45 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPLease*, dhcp_lease_free); |
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 */ | |
90810f7a LP |
51 | int sd_dhcp_server_configure_pool( |
52 | sd_dhcp_server *server, | |
53 | const struct in_addr *address, | |
54 | unsigned char prefixlen, | |
55 | uint32_t offset, | |
56 | uint32_t size) { | |
57 | ||
99634696 TG |
58 | struct in_addr netmask_addr; |
59 | be32_t netmask; | |
60 | uint32_t server_off, broadcast_off, size_max; | |
61 | ||
2dead812 TG |
62 | assert_return(server, -EINVAL); |
63 | assert_return(address, -EINVAL); | |
99634696 TG |
64 | assert_return(address->s_addr != INADDR_ANY, -EINVAL); |
65 | assert_return(prefixlen <= 32, -ERANGE); | |
99634696 | 66 | |
5a941f5f | 67 | assert_se(in4_addr_prefixlen_to_netmask(&netmask_addr, prefixlen)); |
99634696 TG |
68 | netmask = netmask_addr.s_addr; |
69 | ||
70 | server_off = be32toh(address->s_addr & ~netmask); | |
71 | broadcast_off = be32toh(~netmask); | |
72 | ||
73 | /* the server address cannot be the subnet address */ | |
74 | assert_return(server_off != 0, -ERANGE); | |
75 | ||
76 | /* nor the broadcast address */ | |
77 | assert_return(server_off != broadcast_off, -ERANGE); | |
78 | ||
79 | /* 0 offset means we should set a default, we skip the first (subnet) address | |
80 | and take the next one */ | |
81 | if (offset == 0) | |
82 | offset = 1; | |
83 | ||
84 | size_max = (broadcast_off + 1) /* the number of addresses in the subnet */ | |
85 | - offset /* exclude the addresses before the offset */ | |
86 | - 1; /* exclude the last (broadcast) address */ | |
87 | ||
88 | /* The pool must contain at least one address */ | |
89 | assert_return(size_max >= 1, -ERANGE); | |
90 | ||
91 | if (size != 0) | |
92 | assert_return(size <= size_max, -ERANGE); | |
93 | else | |
94 | size = size_max; | |
87322b3a | 95 | |
45a9eac9 | 96 | if (server->address != address->s_addr || server->netmask != netmask || server->pool_size != size || server->pool_offset != offset) { |
45a9eac9 | 97 | |
45a9eac9 RM |
98 | server->pool_offset = offset; |
99 | server->pool_size = size; | |
2dead812 | 100 | |
45a9eac9 RM |
101 | server->address = address->s_addr; |
102 | server->netmask = netmask; | |
103 | server->subnet = address->s_addr & netmask; | |
99634696 | 104 | |
45a9eac9 | 105 | /* Drop any leases associated with the old address range */ |
b713a99b YW |
106 | hashmap_clear(server->bound_leases_by_address); |
107 | hashmap_clear(server->bound_leases_by_client_id); | |
36d35f22 MAL |
108 | |
109 | if (server->callback) | |
110 | server->callback(server, SD_DHCP_SERVER_EVENT_LEASE_CHANGED, server->callback_userdata); | |
45a9eac9 | 111 | } |
20af7091 TG |
112 | |
113 | return 0; | |
114 | } | |
115 | ||
04c01369 | 116 | int sd_dhcp_server_is_running(sd_dhcp_server *server) { |
75677581 | 117 | assert_return(server, false); |
7c16313f TG |
118 | |
119 | return !!server->receive_message; | |
120 | } | |
121 | ||
c95df587 YA |
122 | int sd_dhcp_server_is_in_relay_mode(sd_dhcp_server *server) { |
123 | assert_return(server, -EINVAL); | |
124 | ||
125 | return in4_addr_is_set(&server->relay_target); | |
126 | } | |
127 | ||
7a08d314 | 128 | void client_id_hash_func(const DHCPClientId *id, struct siphash *state) { |
87322b3a | 129 | assert(id); |
a2a80192 | 130 | assert(id->length > 0); |
87322b3a TG |
131 | assert(id->data); |
132 | ||
1e2527a6 | 133 | siphash24_compress(&id->length, sizeof(id->length), state); |
b826ab58 | 134 | siphash24_compress(id->data, id->length, state); |
87322b3a TG |
135 | } |
136 | ||
7a08d314 | 137 | int client_id_compare_func(const DHCPClientId *a, const DHCPClientId *b) { |
a0edd02e | 138 | int r; |
87322b3a | 139 | |
a2a80192 YW |
140 | assert(a->length > 0); |
141 | assert(a->data); | |
142 | assert(b->length > 0); | |
143 | assert(b->data); | |
87322b3a | 144 | |
a0edd02e FB |
145 | r = CMP(a->length, b->length); |
146 | if (r != 0) | |
147 | return r; | |
87322b3a TG |
148 | |
149 | return memcmp(a->data, b->data, a->length); | |
150 | } | |
151 | ||
cedf6a8d YW |
152 | DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR( |
153 | dhcp_lease_hash_ops, | |
154 | DHCPClientId, | |
155 | client_id_hash_func, | |
156 | client_id_compare_func, | |
157 | DHCPLease, | |
158 | dhcp_lease_free); | |
d5099efc | 159 | |
8301aa0b | 160 | static sd_dhcp_server *dhcp_server_free(sd_dhcp_server *server) { |
8301aa0b | 161 | assert(server); |
ff734080 | 162 | |
3bdace9b | 163 | sd_dhcp_server_stop(server); |
87322b3a | 164 | |
3bdace9b LP |
165 | sd_event_unref(server->event); |
166 | ||
6278e428 YW |
167 | free(server->boot_server_name); |
168 | free(server->boot_filename); | |
8eb9058d | 169 | free(server->timezone); |
ddb82ec2 | 170 | |
2324fd3a | 171 | for (sd_dhcp_lease_server_type_t i = 0; i < _SD_DHCP_LEASE_SERVER_TYPE_MAX; i++) |
ddb82ec2 | 172 | free(server->servers[i].addr); |
8eb9058d | 173 | |
b713a99b YW |
174 | server->bound_leases_by_address = hashmap_free(server->bound_leases_by_address); |
175 | server->bound_leases_by_client_id = hashmap_free(server->bound_leases_by_client_id); | |
176 | server->static_leases_by_address = hashmap_free(server->static_leases_by_address); | |
177 | server->static_leases_by_client_id = hashmap_free(server->static_leases_by_client_id); | |
3bdace9b | 178 | |
ebffea2a SS |
179 | ordered_set_free(server->extra_options); |
180 | ordered_set_free(server->vendor_options); | |
564ca984 | 181 | |
11c38d3e YA |
182 | free(server->agent_circuit_id); |
183 | free(server->agent_remote_id); | |
184 | ||
61a9fa8f | 185 | free(server->ifname); |
6b430fdb | 186 | return mfree(server); |
b44cd882 TG |
187 | } |
188 | ||
8301aa0b YW |
189 | DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_server, sd_dhcp_server, dhcp_server_free); |
190 | ||
3a864fe4 | 191 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
4afd3348 | 192 | _cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL; |
b44cd882 TG |
193 | |
194 | assert_return(ret, -EINVAL); | |
3a864fe4 | 195 | assert_return(ifindex > 0, -EINVAL); |
b44cd882 | 196 | |
61a9fa8f | 197 | server = new(sd_dhcp_server, 1); |
b44cd882 TG |
198 | if (!server) |
199 | return -ENOMEM; | |
200 | ||
61a9fa8f YW |
201 | *server = (sd_dhcp_server) { |
202 | .n_ref = 1, | |
203 | .fd_raw = -1, | |
204 | .fd = -1, | |
21b6b87e | 205 | .fd_broadcast = -1, |
61a9fa8f YW |
206 | .address = htobe32(INADDR_ANY), |
207 | .netmask = htobe32(INADDR_ANY), | |
208 | .ifindex = ifindex, | |
21b6b87e | 209 | .bind_to_interface = true, |
61a9fa8f YW |
210 | .default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC), |
211 | .max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC), | |
212 | }; | |
357e1b17 | 213 | |
1cc6c93a | 214 | *ret = TAKE_PTR(server); |
b44cd882 TG |
215 | |
216 | return 0; | |
217 | } | |
218 | ||
61a9fa8f YW |
219 | int sd_dhcp_server_set_ifname(sd_dhcp_server *server, const char *ifname) { |
220 | assert_return(server, -EINVAL); | |
221 | assert_return(ifname, -EINVAL); | |
222 | ||
223 | if (!ifname_valid_full(ifname, IFNAME_VALID_ALTERNATIVE)) | |
224 | return -EINVAL; | |
225 | ||
226 | return free_and_strdup(&server->ifname, ifname); | |
227 | } | |
228 | ||
5977b71f YW |
229 | int sd_dhcp_server_get_ifname(sd_dhcp_server *server, const char **ret) { |
230 | int r; | |
231 | ||
232 | assert_return(server, -EINVAL); | |
61a9fa8f | 233 | |
5977b71f YW |
234 | r = get_ifname(server->ifindex, &server->ifname); |
235 | if (r < 0) | |
236 | return r; | |
237 | ||
238 | if (ret) | |
239 | *ret = server->ifname; | |
240 | ||
241 | return 0; | |
61a9fa8f YW |
242 | } |
243 | ||
32d20645 | 244 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int64_t priority) { |
b44cd882 TG |
245 | int r; |
246 | ||
247 | assert_return(server, -EINVAL); | |
248 | assert_return(!server->event, -EBUSY); | |
249 | ||
250 | if (event) | |
251 | server->event = sd_event_ref(event); | |
252 | else { | |
253 | r = sd_event_default(&server->event); | |
254 | if (r < 0) | |
255 | return r; | |
256 | } | |
257 | ||
258 | server->event_priority = priority; | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
263 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
264 | assert_return(server, -EINVAL); | |
265 | ||
266 | server->event = sd_event_unref(server->event); | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
272 | assert_return(server, NULL); | |
273 | ||
274 | return server->event; | |
275 | } | |
ff734080 | 276 | |
6278e428 | 277 | int sd_dhcp_server_set_boot_server_address(sd_dhcp_server *server, const struct in_addr *address) { |
d5e5cd5c YW |
278 | assert_return(server, -EINVAL); |
279 | ||
6278e428 YW |
280 | if (address) |
281 | server->boot_server_address = *address; | |
d5e5cd5c | 282 | else |
6278e428 | 283 | server->boot_server_address = (struct in_addr) {}; |
d5e5cd5c YW |
284 | |
285 | return 0; | |
286 | } | |
287 | ||
6278e428 YW |
288 | int sd_dhcp_server_set_boot_server_name(sd_dhcp_server *server, const char *name) { |
289 | int r; | |
290 | ||
291 | assert_return(server, -EINVAL); | |
292 | ||
293 | if (name) { | |
294 | r = dns_name_is_valid(name); | |
295 | if (r < 0) | |
296 | return r; | |
297 | if (r == 0) | |
298 | return -EINVAL; | |
299 | } | |
300 | ||
301 | return free_and_strdup(&server->boot_server_name, name); | |
302 | } | |
303 | ||
304 | int sd_dhcp_server_set_boot_filename(sd_dhcp_server *server, const char *filename) { | |
d5e5cd5c YW |
305 | assert_return(server, -EINVAL); |
306 | ||
1aaab936 | 307 | if (filename && (!string_is_safe(filename) || !ascii_is_valid(filename))) |
d5e5cd5c YW |
308 | return -EINVAL; |
309 | ||
6278e428 | 310 | return free_and_strdup(&server->boot_filename, filename); |
d5e5cd5c YW |
311 | } |
312 | ||
ff734080 | 313 | int sd_dhcp_server_stop(sd_dhcp_server *server) { |
0a195d41 YW |
314 | bool running; |
315 | ||
c8bae363 YW |
316 | if (!server) |
317 | return 0; | |
ff734080 | 318 | |
0a195d41 YW |
319 | running = sd_dhcp_server_is_running(server); |
320 | ||
eb2f7502 YW |
321 | server->receive_message = sd_event_source_disable_unref(server->receive_message); |
322 | server->receive_broadcast = sd_event_source_disable_unref(server->receive_broadcast); | |
ff734080 | 323 | |
8de4a226 | 324 | server->fd_raw = safe_close(server->fd_raw); |
ff734080 | 325 | server->fd = safe_close(server->fd); |
21b6b87e | 326 | server->fd_broadcast = safe_close(server->fd_broadcast); |
ff734080 | 327 | |
0a195d41 YW |
328 | if (running) |
329 | log_dhcp_server(server, "STOPPED"); | |
ff734080 TG |
330 | |
331 | return 0; | |
332 | } | |
333 | ||
54d95d02 YW |
334 | static int dhcp_server_send_unicast_raw( |
335 | sd_dhcp_server *server, | |
336 | uint8_t hlen, | |
337 | const uint8_t *chaddr, | |
338 | DHCPPacket *packet, | |
339 | size_t len) { | |
340 | ||
969b009d TG |
341 | union sockaddr_union link = { |
342 | .ll.sll_family = AF_PACKET, | |
8e38570e | 343 | .ll.sll_protocol = htobe16(ETH_P_IP), |
b3ec603c | 344 | .ll.sll_ifindex = server->ifindex, |
54d95d02 | 345 | .ll.sll_halen = hlen, |
969b009d | 346 | }; |
969b009d TG |
347 | |
348 | assert(server); | |
b3ec603c | 349 | assert(server->ifindex > 0); |
6277e48f | 350 | assert(server->address != 0); |
54d95d02 YW |
351 | assert(hlen > 0); |
352 | assert(chaddr); | |
969b009d TG |
353 | assert(packet); |
354 | assert(len > sizeof(DHCPPacket)); | |
355 | ||
54d95d02 | 356 | memcpy(link.ll.sll_addr, chaddr, hlen); |
969b009d | 357 | |
71df50a9 YW |
358 | if (len > UINT16_MAX) |
359 | return -EOVERFLOW; | |
360 | ||
969b009d | 361 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, |
a6f1e036 | 362 | packet->dhcp.yiaddr, |
afe42aef | 363 | DHCP_PORT_CLIENT, len, -1); |
969b009d | 364 | |
b3ec603c | 365 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
969b009d TG |
366 | } |
367 | ||
368 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
8eb7b6a5 | 369 | uint16_t destination_port, |
969b009d TG |
370 | DHCPMessage *message, size_t len) { |
371 | union sockaddr_union dest = { | |
372 | .in.sin_family = AF_INET, | |
8eb7b6a5 | 373 | .in.sin_port = htobe16(destination_port), |
969b009d TG |
374 | .in.sin_addr.s_addr = destination, |
375 | }; | |
376 | struct iovec iov = { | |
377 | .iov_base = message, | |
378 | .iov_len = len, | |
379 | }; | |
fb29cdbe | 380 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in_pktinfo))) control = {}; |
969b009d TG |
381 | struct msghdr msg = { |
382 | .msg_name = &dest, | |
383 | .msg_namelen = sizeof(dest.in), | |
384 | .msg_iov = &iov, | |
385 | .msg_iovlen = 1, | |
969b009d TG |
386 | }; |
387 | struct cmsghdr *cmsg; | |
388 | struct in_pktinfo *pktinfo; | |
969b009d TG |
389 | |
390 | assert(server); | |
4c9cb12c | 391 | assert(server->fd >= 0); |
969b009d TG |
392 | assert(message); |
393 | assert(len > sizeof(DHCPMessage)); | |
394 | ||
21b6b87e YA |
395 | if (server->bind_to_interface) { |
396 | msg.msg_control = &control; | |
397 | msg.msg_controllen = sizeof(control); | |
969b009d | 398 | |
21b6b87e YA |
399 | cmsg = CMSG_FIRSTHDR(&msg); |
400 | assert(cmsg); | |
969b009d | 401 | |
21b6b87e YA |
402 | cmsg->cmsg_level = IPPROTO_IP; |
403 | cmsg->cmsg_type = IP_PKTINFO; | |
404 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
969b009d | 405 | |
21b6b87e YA |
406 | /* we attach source interface and address info to the message |
407 | rather than binding the socket. This will be mostly useful | |
408 | when we gain support for arbitrary number of server addresses | |
409 | */ | |
410 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
411 | assert(pktinfo); | |
412 | ||
413 | pktinfo->ipi_ifindex = server->ifindex; | |
414 | pktinfo->ipi_spec_dst.s_addr = server->address; | |
415 | } | |
969b009d | 416 | |
0f01c1f9 | 417 | if (sendmsg(server->fd, &msg, 0) < 0) |
969b009d TG |
418 | return -errno; |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
c95df587 YA |
423 | static bool requested_broadcast(DHCPMessage *message) { |
424 | assert(message); | |
425 | return message->flags & htobe16(0x8000); | |
426 | } | |
969b009d | 427 | |
54d95d02 YW |
428 | static int dhcp_server_send( |
429 | sd_dhcp_server *server, | |
430 | uint8_t hlen, | |
431 | const uint8_t *chaddr, | |
432 | be32_t destination, | |
433 | uint16_t destination_port, | |
434 | DHCPPacket *packet, | |
435 | size_t optoffset, | |
436 | bool l2_broadcast) { | |
437 | ||
c95df587 YA |
438 | if (destination != INADDR_ANY) |
439 | return dhcp_server_send_udp(server, destination, | |
440 | destination_port, &packet->dhcp, | |
441 | sizeof(DHCPMessage) + optoffset); | |
442 | else if (l2_broadcast) | |
443 | return dhcp_server_send_udp(server, INADDR_BROADCAST, | |
444 | destination_port, &packet->dhcp, | |
445 | sizeof(DHCPMessage) + optoffset); | |
446 | else | |
447 | /* we cannot send UDP packet to specific MAC address when the | |
448 | address is not yet configured, so must fall back to raw | |
449 | packets */ | |
54d95d02 | 450 | return dhcp_server_send_unicast_raw(server, hlen, chaddr, packet, |
c95df587 | 451 | sizeof(DHCPPacket) + optoffset); |
969b009d TG |
452 | } |
453 | ||
454 | int dhcp_server_send_packet(sd_dhcp_server *server, | |
455 | DHCPRequest *req, DHCPPacket *packet, | |
456 | int type, size_t optoffset) { | |
457 | be32_t destination = INADDR_ANY; | |
8eb7b6a5 | 458 | uint16_t destination_port = DHCP_PORT_CLIENT; |
969b009d TG |
459 | int r; |
460 | ||
461 | assert(server); | |
462 | assert(req); | |
6277e48f | 463 | assert(req->max_optlen > 0); |
11c38d3e | 464 | assert(req->message); |
969b009d TG |
465 | assert(optoffset <= req->max_optlen); |
466 | assert(packet); | |
467 | ||
468 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 469 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
969b009d TG |
470 | 4, &server->address); |
471 | if (r < 0) | |
472 | return r; | |
473 | ||
11c38d3e YA |
474 | if (req->agent_info_option) { |
475 | size_t opt_full_length = *(req->agent_info_option + 1) + 2; | |
476 | /* there must be space left for SD_DHCP_OPTION_END */ | |
477 | if (optoffset + opt_full_length < req->max_optlen) { | |
478 | memcpy(packet->dhcp.options + optoffset, req->agent_info_option, opt_full_length); | |
479 | optoffset += opt_full_length; | |
480 | } | |
481 | } | |
482 | ||
969b009d | 483 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, |
22805d92 | 484 | SD_DHCP_OPTION_END, 0, NULL); |
969b009d TG |
485 | if (r < 0) |
486 | return r; | |
487 | ||
488 | /* RFC 2131 Section 4.1 | |
489 | ||
490 | If the ’giaddr’ field in a DHCP message from a client is non-zero, | |
491 | the server sends any return messages to the ’DHCP server’ port on the | |
492 | BOOTP relay agent whose address appears in ’giaddr’. If the ’giaddr’ | |
493 | field is zero and the ’ciaddr’ field is nonzero, then the server | |
494 | unicasts DHCPOFFER and DHCPACK messages to the address in ’ciaddr’. | |
495 | If ’giaddr’ is zero and ’ciaddr’ is zero, and the broadcast bit is | |
496 | set, then the server broadcasts DHCPOFFER and DHCPACK messages to | |
497 | 0xffffffff. If the broadcast bit is not set and ’giaddr’ is zero and | |
498 | ’ciaddr’ is zero, then the server unicasts DHCPOFFER and DHCPACK | |
499 | messages to the client’s hardware address and ’yiaddr’ address. In | |
500 | all cases, when ’giaddr’ is zero, the server broadcasts any DHCPNAK | |
501 | messages to 0xffffffff. | |
502 | ||
503 | Section 4.3.2 | |
504 | ||
505 | If ’giaddr’ is set in the DHCPREQUEST message, the client is on a | |
506 | different subnet. The server MUST set the broadcast bit in the | |
507 | DHCPNAK, so that the relay agent will broadcast the DHCPNAK to the | |
508 | client, because the client may not have a correct network address | |
509 | or subnet mask, and the client may not be answering ARP requests. | |
510 | */ | |
6277e48f | 511 | if (req->message->giaddr != 0) { |
969b009d | 512 | destination = req->message->giaddr; |
8eb7b6a5 | 513 | destination_port = DHCP_PORT_SERVER; |
969b009d TG |
514 | if (type == DHCP_NAK) |
515 | packet->dhcp.flags = htobe16(0x8000); | |
6277e48f | 516 | } else if (req->message->ciaddr != 0 && type != DHCP_NAK) |
969b009d TG |
517 | destination = req->message->ciaddr; |
518 | ||
c95df587 | 519 | bool l2_broadcast = requested_broadcast(req->message) || type == DHCP_NAK; |
54d95d02 YW |
520 | return dhcp_server_send(server, req->message->hlen, req->message->chaddr, |
521 | destination, destination_port, packet, optoffset, l2_broadcast); | |
969b009d TG |
522 | } |
523 | ||
48be485b YW |
524 | static int server_message_init( |
525 | sd_dhcp_server *server, | |
526 | DHCPPacket **ret, | |
527 | uint8_t type, | |
528 | size_t *ret_optoffset, | |
529 | DHCPRequest *req) { | |
530 | ||
4dc35568 | 531 | _cleanup_free_ DHCPPacket *packet = NULL; |
1231c4d2 | 532 | size_t optoffset = 0; |
4dc35568 TG |
533 | int r; |
534 | ||
535 | assert(server); | |
536 | assert(ret); | |
48be485b | 537 | assert(ret_optoffset); |
bd57b450 | 538 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)); |
48be485b | 539 | assert(req); |
4dc35568 TG |
540 | |
541 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen); | |
542 | if (!packet) | |
543 | return -ENOMEM; | |
544 | ||
a6f1e036 | 545 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
97fa338d YW |
546 | be32toh(req->message->xid), type, |
547 | req->message->htype, req->message->hlen, req->message->chaddr, | |
76253e73 | 548 | req->max_optlen, &optoffset); |
4dc35568 TG |
549 | if (r < 0) |
550 | return r; | |
551 | ||
552 | packet->dhcp.flags = req->message->flags; | |
553 | packet->dhcp.giaddr = req->message->giaddr; | |
4dc35568 | 554 | |
48be485b | 555 | *ret_optoffset = optoffset; |
1cc6c93a | 556 | *ret = TAKE_PTR(packet); |
4dc35568 TG |
557 | |
558 | return 0; | |
559 | } | |
560 | ||
986c0edf | 561 | static int server_send_offer_or_ack( |
ddb82ec2 LP |
562 | sd_dhcp_server *server, |
563 | DHCPRequest *req, | |
986c0edf YW |
564 | be32_t address, |
565 | uint8_t type) { | |
ddb82ec2 | 566 | |
2dead812 | 567 | _cleanup_free_ DHCPPacket *packet = NULL; |
7354900d | 568 | sd_dhcp_option *j; |
986c0edf | 569 | be32_t lease_time; |
564ca984 | 570 | size_t offset; |
2dead812 TG |
571 | int r; |
572 | ||
986c0edf YW |
573 | assert(server); |
574 | assert(req); | |
575 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK)); | |
576 | ||
577 | r = server_message_init(server, &packet, type, &offset, req); | |
2dead812 TG |
578 | if (r < 0) |
579 | return r; | |
580 | ||
581 | packet->dhcp.yiaddr = address; | |
6278e428 | 582 | packet->dhcp.siaddr = server->boot_server_address.s_addr; |
2dead812 | 583 | |
c7d9ffe6 | 584 | lease_time = htobe32(req->lifetime); |
2dead812 | 585 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 586 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 587 | &lease_time); |
2dead812 TG |
588 | if (r < 0) |
589 | return r; | |
590 | ||
59b8f6b6 | 591 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 592 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
593 | if (r < 0) |
594 | return r; | |
595 | ||
77ff6022 CG |
596 | if (server->emit_router) { |
597 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
59aa6220 YW |
598 | SD_DHCP_OPTION_ROUTER, 4, |
599 | in4_addr_is_set(&server->router_address) ? | |
600 | &server->router_address.s_addr : | |
601 | &server->address); | |
77ff6022 CG |
602 | if (r < 0) |
603 | return r; | |
604 | } | |
59b8f6b6 | 605 | |
6278e428 | 606 | if (server->boot_server_name) { |
d5e5cd5c | 607 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
6278e428 YW |
608 | SD_DHCP_OPTION_BOOT_SERVER_NAME, |
609 | strlen(server->boot_server_name), server->boot_server_name); | |
d5e5cd5c YW |
610 | if (r < 0) |
611 | return r; | |
6278e428 | 612 | } |
d5e5cd5c | 613 | |
6278e428 | 614 | if (server->boot_filename) { |
d5e5cd5c | 615 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
6278e428 YW |
616 | SD_DHCP_OPTION_BOOT_FILENAME, |
617 | strlen(server->boot_filename), server->boot_filename); | |
d5e5cd5c YW |
618 | if (r < 0) |
619 | return r; | |
620 | } | |
621 | ||
986c0edf YW |
622 | if (type == DHCP_ACK) { |
623 | static const uint8_t option_map[_SD_DHCP_LEASE_SERVER_TYPE_MAX] = { | |
624 | [SD_DHCP_LEASE_DNS] = SD_DHCP_OPTION_DOMAIN_NAME_SERVER, | |
625 | [SD_DHCP_LEASE_NTP] = SD_DHCP_OPTION_NTP_SERVER, | |
626 | [SD_DHCP_LEASE_SIP] = SD_DHCP_OPTION_SIP_SERVER, | |
627 | [SD_DHCP_LEASE_POP3] = SD_DHCP_OPTION_POP3_SERVER, | |
628 | [SD_DHCP_LEASE_SMTP] = SD_DHCP_OPTION_SMTP_SERVER, | |
629 | [SD_DHCP_LEASE_LPR] = SD_DHCP_OPTION_LPR_SERVER, | |
630 | }; | |
631 | ||
632 | for (sd_dhcp_lease_server_type_t k = 0; k < _SD_DHCP_LEASE_SERVER_TYPE_MAX; k++) { | |
633 | if (server->servers[k].size <= 0) | |
634 | continue; | |
635 | ||
636 | r = dhcp_option_append( | |
637 | &packet->dhcp, req->max_optlen, &offset, 0, | |
638 | option_map[k], | |
639 | sizeof(struct in_addr) * server->servers[k].size, | |
640 | server->servers[k].addr); | |
641 | if (r < 0) | |
642 | return r; | |
643 | } | |
2c649ca1 | 644 | |
50018bfa | 645 | |
986c0edf YW |
646 | if (server->timezone) { |
647 | r = dhcp_option_append( | |
648 | &packet->dhcp, req->max_optlen, &offset, 0, | |
3cb62efe | 649 | SD_DHCP_OPTION_TZDB_TIMEZONE, |
986c0edf YW |
650 | strlen(server->timezone), server->timezone); |
651 | if (r < 0) | |
652 | return r; | |
653 | } | |
8eb9058d LP |
654 | } |
655 | ||
ebffea2a | 656 | ORDERED_SET_FOREACH(j, server->extra_options) { |
7354900d DW |
657 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
658 | j->option, j->length, j->data); | |
659 | if (r < 0) | |
660 | return r; | |
661 | } | |
662 | ||
ebffea2a | 663 | if (!ordered_set_isempty(server->vendor_options)) { |
564ca984 SS |
664 | r = dhcp_option_append( |
665 | &packet->dhcp, req->max_optlen, &offset, 0, | |
666 | SD_DHCP_OPTION_VENDOR_SPECIFIC, | |
ebffea2a | 667 | ordered_set_size(server->vendor_options), server->vendor_options); |
564ca984 SS |
668 | if (r < 0) |
669 | return r; | |
670 | } | |
671 | ||
4f9dcf3d | 672 | return dhcp_server_send_packet(server, req, packet, type, offset); |
2dead812 TG |
673 | } |
674 | ||
eb5bff9c | 675 | static int server_send_nak_or_ignore(sd_dhcp_server *server, bool init_reboot, DHCPRequest *req) { |
bd57b450 TG |
676 | _cleanup_free_ DHCPPacket *packet = NULL; |
677 | size_t offset; | |
678 | int r; | |
679 | ||
eb5bff9c YW |
680 | /* When a request is refused, RFC 2131, section 4.3.2 mentioned we should send NAK when the |
681 | * client is in INITREBOOT. If the client is in other state, there is nothing mentioned in the | |
682 | * RFC whether we should send NAK or not. Hence, let's silently ignore the request. */ | |
683 | ||
684 | if (!init_reboot) | |
685 | return 0; | |
686 | ||
bd57b450 TG |
687 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); |
688 | if (r < 0) | |
eb5bff9c YW |
689 | return log_dhcp_server_errno(server, r, "Failed to create NAK message: %m"); |
690 | ||
691 | r = dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); | |
692 | if (r < 0) | |
693 | return log_dhcp_server_errno(server, r, "Could not send NAK message: %m"); | |
bd57b450 | 694 | |
eb5bff9c YW |
695 | log_dhcp_server(server, "NAK (0x%x)", be32toh(req->message->xid)); |
696 | return DHCP_NAK; | |
bd57b450 TG |
697 | } |
698 | ||
54d95d02 YW |
699 | static int server_send_forcerenew( |
700 | sd_dhcp_server *server, | |
701 | be32_t address, | |
702 | be32_t gateway, | |
703 | uint8_t htype, | |
704 | uint8_t hlen, | |
705 | const uint8_t *chaddr) { | |
706 | ||
52750344 TG |
707 | _cleanup_free_ DHCPPacket *packet = NULL; |
708 | size_t optoffset = 0; | |
709 | int r; | |
710 | ||
711 | assert(server); | |
712 | assert(address != INADDR_ANY); | |
713 | assert(chaddr); | |
714 | ||
715 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
716 | if (!packet) | |
717 | return -ENOMEM; | |
718 | ||
719 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
54d95d02 | 720 | DHCP_FORCERENEW, htype, hlen, chaddr, |
76253e73 | 721 | DHCP_MIN_OPTIONS_SIZE, &optoffset); |
52750344 TG |
722 | if (r < 0) |
723 | return r; | |
724 | ||
725 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
22805d92 | 726 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL); |
52750344 TG |
727 | if (r < 0) |
728 | return r; | |
729 | ||
4f9dcf3d YW |
730 | return dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, |
731 | &packet->dhcp, | |
732 | sizeof(DHCPMessage) + optoffset); | |
52750344 TG |
733 | } |
734 | ||
b3ec603c | 735 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
89ca10c6 | 736 | DHCPRequest *req = userdata; |
816e2e7a TG |
737 | |
738 | assert(req); | |
739 | ||
740 | switch(code) { | |
22805d92 | 741 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
c7d9ffe6 | 742 | if (len == 4) |
9ae84244 | 743 | req->lifetime = unaligned_read_be32(option); |
c7d9ffe6 TG |
744 | |
745 | break; | |
22805d92 | 746 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
2dead812 | 747 | if (len == 4) |
9ae84244 | 748 | memcpy(&req->requested_ip, option, sizeof(be32_t)); |
2dead812 TG |
749 | |
750 | break; | |
22805d92 | 751 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
816e2e7a | 752 | if (len == 4) |
9ae84244 | 753 | memcpy(&req->server_id, option, sizeof(be32_t)); |
816e2e7a TG |
754 | |
755 | break; | |
22805d92 | 756 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
816e2e7a TG |
757 | if (len >= 2) { |
758 | uint8_t *data; | |
759 | ||
760 | data = memdup(option, len); | |
761 | if (!data) | |
762 | return -ENOMEM; | |
763 | ||
255d4933 | 764 | free_and_replace(req->client_id.data, data); |
816e2e7a TG |
765 | req->client_id.length = len; |
766 | } | |
767 | ||
768 | break; | |
22805d92 | 769 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
76a9d0f1 LP |
770 | |
771 | if (len == 2 && unaligned_read_be16(option) >= sizeof(DHCPPacket)) | |
9ae84244 | 772 | req->max_optlen = unaligned_read_be16(option) - sizeof(DHCPPacket); |
816e2e7a | 773 | |
11c38d3e YA |
774 | break; |
775 | case SD_DHCP_OPTION_RELAY_AGENT_INFORMATION: | |
776 | req->agent_info_option = (uint8_t*)option - 2; | |
777 | ||
816e2e7a TG |
778 | break; |
779 | } | |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
75db809a | 784 | static DHCPRequest* dhcp_request_free(DHCPRequest *req) { |
816e2e7a | 785 | if (!req) |
75db809a | 786 | return NULL; |
816e2e7a TG |
787 | |
788 | free(req->client_id.data); | |
75db809a | 789 | return mfree(req); |
816e2e7a TG |
790 | } |
791 | ||
792 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
816e2e7a | 793 | |
586ac6f7 | 794 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
816e2e7a TG |
795 | assert(req); |
796 | assert(message); | |
797 | ||
798 | req->message = message; | |
799 | ||
ab4f9eeb YW |
800 | if (message->hlen > sizeof(message->chaddr)) |
801 | return -EBADMSG; | |
802 | ||
54d95d02 | 803 | /* set client id based on MAC address if client did not send an explicit one */ |
816e2e7a | 804 | if (!req->client_id.data) { |
2cb66bbd | 805 | uint8_t *data; |
816e2e7a | 806 | |
54d95d02 YW |
807 | if (message->hlen == 0) |
808 | return -EBADMSG; | |
809 | ||
810 | data = new0(uint8_t, message->hlen + 1); | |
816e2e7a TG |
811 | if (!data) |
812 | return -ENOMEM; | |
813 | ||
2cb66bbd | 814 | data[0] = 0x01; |
54d95d02 | 815 | memcpy(data + 1, message->chaddr, message->hlen); |
9a0f246f | 816 | |
54d95d02 | 817 | req->client_id.length = message->hlen + 1; |
816e2e7a | 818 | req->client_id.data = data; |
816e2e7a TG |
819 | } |
820 | ||
54d95d02 YW |
821 | if (message->hlen == 0 || memeqzero(message->chaddr, message->hlen)) { |
822 | /* See RFC2131 section 4.1.1. | |
823 | * hlen and chaddr may not be set for non-ethernet interface. | |
824 | * Let's try to retrieve it from the client ID. */ | |
825 | ||
826 | if (!req->client_id.data) | |
827 | return -EBADMSG; | |
828 | ||
829 | if (req->client_id.length <= 1 || req->client_id.length > sizeof(message->chaddr) + 1) | |
830 | return -EBADMSG; | |
831 | ||
832 | if (req->client_id.data[0] != 0x01) | |
833 | return -EBADMSG; | |
834 | ||
835 | message->hlen = req->client_id.length - 1; | |
836 | memcpy(message->chaddr, req->client_id.data + 1, message->hlen); | |
837 | } | |
838 | ||
816e2e7a TG |
839 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) |
840 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
841 | ||
9a0f246f | 842 | if (req->lifetime <= 0) |
586ac6f7 LP |
843 | req->lifetime = MAX(1ULL, server->default_lease_time); |
844 | ||
845 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
846 | req->lifetime = server->max_lease_time; | |
c7d9ffe6 | 847 | |
816e2e7a TG |
848 | return 0; |
849 | } | |
850 | ||
5cc8be89 | 851 | static bool address_is_in_pool(sd_dhcp_server *server, be32_t address) { |
87322b3a TG |
852 | assert(server); |
853 | ||
6277e48f | 854 | if (server->pool_size == 0) |
5cc8be89 | 855 | return false; |
87322b3a | 856 | |
9e0cb8b6 YW |
857 | if (address == server->address) |
858 | return false; | |
859 | ||
5cc8be89 YW |
860 | if (be32toh(address) < (be32toh(server->subnet) | server->pool_offset) || |
861 | be32toh(address) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
862 | return false; | |
87322b3a | 863 | |
bd1a3eb6 YW |
864 | if (hashmap_contains(server->static_leases_by_address, UINT32_TO_PTR(address))) |
865 | return false; | |
866 | ||
5cc8be89 | 867 | return true; |
87322b3a TG |
868 | } |
869 | ||
11c38d3e YA |
870 | static int append_agent_information_option(sd_dhcp_server *server, DHCPMessage *message, size_t opt_length, size_t size) { |
871 | int r; | |
872 | size_t offset; | |
873 | ||
874 | assert(server); | |
875 | assert(message); | |
876 | ||
877 | r = dhcp_option_find_option(message->options, opt_length, SD_DHCP_OPTION_END, &offset); | |
878 | if (r < 0) | |
879 | return r; | |
880 | ||
881 | r = dhcp_option_append(message, size, &offset, 0, SD_DHCP_OPTION_RELAY_AGENT_INFORMATION, 0, server); | |
882 | if (r < 0) | |
883 | return r; | |
884 | ||
885 | r = dhcp_option_append(message, size, &offset, 0, SD_DHCP_OPTION_END, 0, NULL); | |
886 | if (r < 0) | |
887 | return r; | |
888 | return offset; | |
889 | } | |
890 | ||
891 | static int dhcp_server_relay_message(sd_dhcp_server *server, DHCPMessage *message, size_t opt_length, size_t buflen) { | |
c95df587 | 892 | _cleanup_free_ DHCPPacket *packet = NULL; |
11c38d3e | 893 | int r; |
c95df587 YA |
894 | |
895 | assert(server); | |
896 | assert(message); | |
897 | assert(sd_dhcp_server_is_in_relay_mode(server)); | |
898 | ||
54d95d02 YW |
899 | if (message->hlen == 0 || message->hlen > sizeof(message->chaddr) || memeqzero(message->chaddr, message->hlen)) |
900 | return log_dhcp_server_errno(server, SYNTHETIC_ERRNO(EBADMSG), | |
901 | "(relay agent) received message without/invalid hardware address, discarding."); | |
902 | ||
c95df587 YA |
903 | if (message->op == BOOTREQUEST) { |
904 | log_dhcp_server(server, "(relay agent) BOOTREQUEST (0x%x)", be32toh(message->xid)); | |
905 | if (message->hops >= 16) | |
906 | return -ETIME; | |
907 | message->hops++; | |
908 | ||
909 | /* https://tools.ietf.org/html/rfc1542#section-4.1.1 */ | |
910 | if (message->giaddr == 0) | |
911 | message->giaddr = server->address; | |
912 | ||
11c38d3e YA |
913 | if (server->agent_circuit_id || server->agent_remote_id) { |
914 | r = append_agent_information_option(server, message, opt_length, buflen - sizeof(DHCPMessage)); | |
915 | if (r < 0) | |
916 | return log_dhcp_server_errno(server, r, "could not append relay option: %m"); | |
917 | opt_length = r; | |
918 | } | |
919 | ||
c95df587 YA |
920 | return dhcp_server_send_udp(server, server->relay_target.s_addr, DHCP_PORT_SERVER, message, sizeof(DHCPMessage) + opt_length); |
921 | } else if (message->op == BOOTREPLY) { | |
922 | log_dhcp_server(server, "(relay agent) BOOTREPLY (0x%x)", be32toh(message->xid)); | |
11c38d3e | 923 | if (message->giaddr != server->address) |
c95df587 | 924 | return log_dhcp_server_errno(server, SYNTHETIC_ERRNO(EBADMSG), |
11c38d3e | 925 | "(relay agent) BOOTREPLY giaddr mismatch, discarding"); |
c95df587 YA |
926 | |
927 | int message_type = dhcp_option_parse(message, sizeof(DHCPMessage) + opt_length, NULL, NULL, NULL); | |
928 | if (message_type < 0) | |
929 | return message_type; | |
930 | ||
931 | packet = malloc0(sizeof(DHCPPacket) + opt_length); | |
932 | if (!packet) | |
933 | return -ENOMEM; | |
934 | memcpy(&packet->dhcp, message, sizeof(DHCPMessage) + opt_length); | |
935 | ||
11c38d3e YA |
936 | r = dhcp_option_remove_option(packet->dhcp.options, opt_length, SD_DHCP_OPTION_RELAY_AGENT_INFORMATION); |
937 | if (r > 0) | |
938 | opt_length = r; | |
939 | ||
c95df587 YA |
940 | bool l2_broadcast = requested_broadcast(message) || message_type == DHCP_NAK; |
941 | const be32_t destination = message_type == DHCP_NAK ? INADDR_ANY : message->ciaddr; | |
54d95d02 | 942 | return dhcp_server_send(server, message->hlen, message->chaddr, destination, DHCP_PORT_CLIENT, packet, opt_length, l2_broadcast); |
c95df587 YA |
943 | } |
944 | return -EBADMSG; | |
945 | } | |
946 | ||
65a0ef23 | 947 | static int prepare_new_lease( |
948 | DHCPLease **ret_lease, | |
949 | be32_t address, | |
950 | const DHCPClientId *client_id, | |
54d95d02 YW |
951 | uint8_t htype, |
952 | uint8_t hlen, | |
953 | const uint8_t *chaddr, | |
65a0ef23 | 954 | be32_t gateway, |
955 | usec_t expiration) { | |
956 | ||
957 | _cleanup_(dhcp_lease_freep) DHCPLease *lease = NULL; | |
958 | ||
959 | lease = new(DHCPLease, 1); | |
960 | if (!lease) | |
961 | return -ENOMEM; | |
962 | ||
963 | *lease = (DHCPLease) { | |
964 | .address = address, | |
965 | .client_id.length = client_id->length, | |
54d95d02 YW |
966 | .htype = htype, |
967 | .hlen = hlen, | |
65a0ef23 | 968 | .gateway = gateway, |
969 | .expiration = expiration, | |
970 | }; | |
971 | lease->client_id.data = memdup(client_id->data, client_id->length); | |
972 | if (!lease->client_id.data) | |
973 | return -ENOMEM; | |
974 | ||
54d95d02 | 975 | memcpy(lease->chaddr, chaddr, hlen); |
65a0ef23 | 976 | |
977 | *ret_lease = TAKE_PTR(lease); | |
978 | ||
979 | return 0; | |
980 | } | |
981 | ||
8b572f7a YW |
982 | static int server_ack_request(sd_dhcp_server *server, DHCPRequest *req, DHCPLease *existing_lease, be32_t address) { |
983 | usec_t time_now, expiration; | |
984 | int r; | |
985 | ||
986 | assert(server); | |
987 | assert(req); | |
988 | assert(address != 0); | |
989 | ||
990 | r = sd_event_now(server->event, clock_boottime_or_monotonic(), &time_now); | |
991 | if (r < 0) | |
992 | return r; | |
993 | ||
994 | expiration = usec_add(req->lifetime * USEC_PER_SEC, time_now); | |
995 | ||
996 | if (existing_lease) { | |
997 | assert(existing_lease->server); | |
998 | assert(existing_lease->address == address); | |
999 | existing_lease->expiration = expiration; | |
1000 | ||
1001 | } else { | |
1002 | _cleanup_(dhcp_lease_freep) DHCPLease *lease = NULL; | |
1003 | ||
1004 | r = prepare_new_lease(&lease, address, &req->client_id, | |
1005 | req->message->htype, req->message->hlen, | |
1006 | req->message->chaddr, req->message->giaddr, expiration); | |
1007 | if (r < 0) | |
1008 | return log_dhcp_server_errno(server, r, "Failed to create new lease: %m"); | |
1009 | ||
1010 | lease->server = server; /* This must be set just before hashmap_put(). */ | |
1011 | ||
1012 | r = hashmap_ensure_put(&server->bound_leases_by_client_id, &dhcp_lease_hash_ops, &lease->client_id, lease); | |
1013 | if (r < 0) | |
1014 | return log_dhcp_server_errno(server, r, "Could not save lease: %m"); | |
1015 | ||
1016 | r = hashmap_ensure_put(&server->bound_leases_by_address, NULL, UINT32_TO_PTR(lease->address), lease); | |
1017 | if (r < 0) | |
1018 | return log_dhcp_server_errno(server, r, "Could not save lease: %m"); | |
1019 | ||
1020 | TAKE_PTR(lease); | |
1021 | } | |
1022 | ||
1023 | r = server_send_offer_or_ack(server, req, address, DHCP_ACK); | |
1024 | if (r < 0) | |
1025 | return log_dhcp_server_errno(server, r, "Could not send ACK: %m"); | |
1026 | ||
1027 | log_dhcp_server(server, "ACK (0x%x)", be32toh(req->message->xid)); | |
1028 | ||
1029 | if (server->callback) | |
1030 | server->callback(server, SD_DHCP_SERVER_EVENT_LEASE_CHANGED, server->callback_userdata); | |
1031 | ||
1032 | return DHCP_ACK; | |
1033 | } | |
1034 | ||
d635a7f9 THJ |
1035 | static int dhcp_server_cleanup_expired_leases(sd_dhcp_server *server) { |
1036 | DHCPLease *lease; | |
1037 | usec_t time_now; | |
1038 | int r; | |
1039 | ||
1040 | assert(server); | |
1041 | ||
1042 | r = sd_event_now(server->event, clock_boottime_or_monotonic(), &time_now); | |
1043 | if (r < 0) | |
1044 | return r; | |
1045 | ||
4f9dcf3d | 1046 | HASHMAP_FOREACH(lease, server->bound_leases_by_client_id) |
d635a7f9 THJ |
1047 | if (lease->expiration < time_now) { |
1048 | log_dhcp_server(server, "CLEAN (0x%x)", be32toh(lease->address)); | |
1049 | dhcp_lease_free(lease); | |
1050 | } | |
d635a7f9 THJ |
1051 | |
1052 | return 0; | |
1053 | } | |
1054 | ||
cb3c06a0 THJ |
1055 | static bool address_available(sd_dhcp_server *server, be32_t address) { |
1056 | assert(server); | |
1057 | ||
1058 | if (hashmap_contains(server->bound_leases_by_address, UINT32_TO_PTR(address)) || | |
1059 | hashmap_contains(server->static_leases_by_address, UINT32_TO_PTR(address)) || | |
1060 | address == server->address) | |
1061 | return false; | |
1062 | ||
1063 | return true; | |
1064 | } | |
1065 | ||
83cedf7a TG |
1066 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
1067 | ||
65a0ef23 | 1068 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, size_t length) { |
8e766630 | 1069 | _cleanup_(dhcp_request_freep) DHCPRequest *req = NULL; |
f693e9b3 | 1070 | _cleanup_free_ char *error_message = NULL; |
65a0ef23 | 1071 | DHCPLease *existing_lease, *static_lease; |
816e2e7a | 1072 | int type, r; |
be077570 TG |
1073 | |
1074 | assert(server); | |
1075 | assert(message); | |
1076 | ||
54d95d02 | 1077 | if (message->op != BOOTREQUEST) |
be077570 TG |
1078 | return 0; |
1079 | ||
816e2e7a TG |
1080 | req = new0(DHCPRequest, 1); |
1081 | if (!req) | |
1082 | return -ENOMEM; | |
1083 | ||
f693e9b3 | 1084 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
be077570 TG |
1085 | if (type < 0) |
1086 | return 0; | |
1087 | ||
586ac6f7 | 1088 | r = ensure_sane_request(server, req, message); |
816e2e7a | 1089 | if (r < 0) |
816e2e7a TG |
1090 | return r; |
1091 | ||
d635a7f9 THJ |
1092 | r = dhcp_server_cleanup_expired_leases(server); |
1093 | if (r < 0) | |
1094 | return r; | |
1095 | ||
b713a99b | 1096 | existing_lease = hashmap_get(server->bound_leases_by_client_id, &req->client_id); |
65a0ef23 | 1097 | static_lease = hashmap_get(server->static_leases_by_client_id, &req->client_id); |
87322b3a | 1098 | |
4dc35568 | 1099 | switch(type) { |
9a0f246f LP |
1100 | |
1101 | case DHCP_DISCOVER: { | |
87322b3a | 1102 | be32_t address = INADDR_ANY; |
2dead812 | 1103 | |
65a0ef23 | 1104 | log_dhcp_server(server, "DISCOVER (0x%x)", be32toh(req->message->xid)); |
4dc35568 | 1105 | |
6277e48f | 1106 | if (server->pool_size == 0) |
2dead812 TG |
1107 | /* no pool allocated */ |
1108 | return 0; | |
1109 | ||
87322b3a | 1110 | /* for now pick a random free address from the pool */ |
65a0ef23 | 1111 | if (static_lease) |
1112 | address = static_lease->address; | |
1113 | else if (existing_lease) | |
87322b3a TG |
1114 | address = existing_lease->address; |
1115 | else { | |
b826ab58 | 1116 | struct siphash state; |
0cb3c286 | 1117 | uint64_t hash; |
83cedf7a TG |
1118 | |
1119 | /* even with no persistence of leases, we try to offer the same client | |
1120 | the same IP address. we do this by using the hash of the client id | |
1121 | as the offset into the pool of leases when finding the next free one */ | |
1122 | ||
0cb3c286 | 1123 | siphash24_init(&state, HASH_KEY.bytes); |
b826ab58 | 1124 | client_id_hash_func(&req->client_id, &state); |
933f9cae | 1125 | hash = htole64(siphash24_finalize(&state)); |
6408ba5f | 1126 | |
b713a99b YW |
1127 | for (unsigned i = 0; i < server->pool_size; i++) { |
1128 | be32_t tmp_address; | |
1129 | ||
1130 | tmp_address = server->subnet | htobe32(server->pool_offset + (hash + i) % server->pool_size); | |
cb3c06a0 | 1131 | if (address_available(server, tmp_address)) { |
b713a99b YW |
1132 | address = tmp_address; |
1133 | break; | |
1134 | } | |
87322b3a TG |
1135 | } |
1136 | } | |
1137 | ||
1138 | if (address == INADDR_ANY) | |
1139 | /* no free addresses left */ | |
1140 | return 0; | |
2dead812 | 1141 | |
986c0edf | 1142 | r = server_send_offer_or_ack(server, req, address, DHCP_OFFER); |
6e741541 | 1143 | if (r < 0) |
4dc35568 | 1144 | /* this only fails on critical errors */ |
6e741541 | 1145 | return log_dhcp_server_errno(server, r, "Could not send offer: %m"); |
be077570 | 1146 | |
6e741541 LP |
1147 | log_dhcp_server(server, "OFFER (0x%x)", be32toh(req->message->xid)); |
1148 | return DHCP_OFFER; | |
4dc35568 | 1149 | } |
5b34277c | 1150 | case DHCP_DECLINE: |
f693e9b3 | 1151 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message)); |
5b34277c TG |
1152 | |
1153 | /* TODO: make sure we don't offer this address again */ | |
1154 | ||
1155 | return 1; | |
1156 | ||
9a0f246f | 1157 | case DHCP_REQUEST: { |
2dead812 | 1158 | be32_t address; |
bd57b450 | 1159 | bool init_reboot = false; |
2dead812 TG |
1160 | |
1161 | /* see RFC 2131, section 4.3.2 */ | |
1162 | ||
6277e48f | 1163 | if (req->server_id != 0) { |
2dead812 TG |
1164 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", |
1165 | be32toh(req->message->xid)); | |
1166 | ||
1167 | /* SELECTING */ | |
1168 | if (req->server_id != server->address) | |
1169 | /* client did not pick us */ | |
1170 | return 0; | |
1171 | ||
6277e48f | 1172 | if (req->message->ciaddr != 0) |
2dead812 TG |
1173 | /* this MUST be zero */ |
1174 | return 0; | |
1175 | ||
6277e48f | 1176 | if (req->requested_ip == 0) |
2dead812 TG |
1177 | /* this must be filled in with the yiaddr |
1178 | from the chosen OFFER */ | |
1179 | return 0; | |
1180 | ||
1181 | address = req->requested_ip; | |
6277e48f | 1182 | } else if (req->requested_ip != 0) { |
2dead812 TG |
1183 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", |
1184 | be32toh(req->message->xid)); | |
1185 | ||
1186 | /* INIT-REBOOT */ | |
6277e48f | 1187 | if (req->message->ciaddr != 0) |
2dead812 TG |
1188 | /* this MUST be zero */ |
1189 | return 0; | |
1190 | ||
bd57b450 | 1191 | /* TODO: check more carefully if IP is correct */ |
2dead812 | 1192 | address = req->requested_ip; |
bd57b450 | 1193 | init_reboot = true; |
2dead812 TG |
1194 | } else { |
1195 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
1196 | be32toh(req->message->xid)); | |
1197 | ||
1198 | /* REBINDING / RENEWING */ | |
6277e48f | 1199 | if (req->message->ciaddr == 0) |
2dead812 TG |
1200 | /* this MUST be filled in with clients IP address */ |
1201 | return 0; | |
1202 | ||
1203 | address = req->message->ciaddr; | |
1204 | } | |
1205 | ||
cb3c06a0 THJ |
1206 | /* disallow our own address */ |
1207 | if (address == server->address) | |
1208 | return 0; | |
1209 | ||
e2ba4080 YW |
1210 | if (static_lease) { |
1211 | /* Found a static lease for the client ID. */ | |
1212 | ||
1213 | if (static_lease->address != address) | |
1214 | /* The client requested an address which is different from the static lease. Refuse. */ | |
1215 | return server_send_nak_or_ignore(server, init_reboot, req); | |
1216 | ||
8b572f7a | 1217 | return server_ack_request(server, req, existing_lease, address); |
5cc8be89 | 1218 | } |
65a0ef23 | 1219 | |
7e98fe05 YW |
1220 | if (address_is_in_pool(server, address)) { |
1221 | /* The requested address is in the pool. */ | |
1222 | ||
1223 | if (existing_lease && existing_lease->address != address) | |
1224 | /* We previously assigned an address, but the client requested another one. Refuse. */ | |
1225 | return server_send_nak_or_ignore(server, init_reboot, req); | |
1226 | ||
8b572f7a | 1227 | return server_ack_request(server, req, existing_lease, address); |
bd57b450 | 1228 | } |
2dead812 | 1229 | |
eb5bff9c | 1230 | return server_send_nak_or_ignore(server, init_reboot, req); |
2dead812 | 1231 | } |
9a0f246f | 1232 | |
500792d8 | 1233 | case DHCP_RELEASE: { |
500792d8 TG |
1234 | log_dhcp_server(server, "RELEASE (0x%x)", |
1235 | be32toh(req->message->xid)); | |
1236 | ||
1237 | if (!existing_lease) | |
1238 | return 0; | |
1239 | ||
1240 | if (existing_lease->address != req->message->ciaddr) | |
1241 | return 0; | |
1242 | ||
b713a99b | 1243 | dhcp_lease_free(existing_lease); |
36d35f22 | 1244 | |
b713a99b YW |
1245 | if (server->callback) |
1246 | server->callback(server, SD_DHCP_SERVER_EVENT_LEASE_CHANGED, server->callback_userdata); | |
500792d8 | 1247 | |
c3922c0c LP |
1248 | return 0; |
1249 | }} | |
4dc35568 TG |
1250 | |
1251 | return 0; | |
be077570 TG |
1252 | } |
1253 | ||
11c38d3e YA |
1254 | static size_t relay_agent_information_length(const char* agent_circuit_id, const char* agent_remote_id) { |
1255 | size_t sum = 0; | |
1256 | if (agent_circuit_id) | |
1257 | sum += 2 + strlen(agent_circuit_id); | |
1258 | if (agent_remote_id) | |
1259 | sum += 2 + strlen(agent_remote_id); | |
1260 | return sum; | |
1261 | } | |
1262 | ||
ff734080 TG |
1263 | static int server_receive_message(sd_event_source *s, int fd, |
1264 | uint32_t revents, void *userdata) { | |
be077570 | 1265 | _cleanup_free_ DHCPMessage *message = NULL; |
fb29cdbe | 1266 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in_pktinfo))) control; |
ff734080 TG |
1267 | sd_dhcp_server *server = userdata; |
1268 | struct iovec iov = {}; | |
1269 | struct msghdr msg = { | |
1270 | .msg_iov = &iov, | |
1271 | .msg_iovlen = 1, | |
fb29cdbe LP |
1272 | .msg_control = &control, |
1273 | .msg_controllen = sizeof(control), | |
ff734080 | 1274 | }; |
3a864fe4 | 1275 | struct cmsghdr *cmsg; |
11c38d3e | 1276 | ssize_t datagram_size, len; |
57027d03 | 1277 | int r; |
ff734080 TG |
1278 | |
1279 | assert(server); | |
1280 | ||
11c38d3e | 1281 | datagram_size = next_datagram_size_fd(fd); |
ab8a8a4e YW |
1282 | if (datagram_size < 0) { |
1283 | if (ERRNO_IS_TRANSIENT(datagram_size) || ERRNO_IS_DISCONNECT(datagram_size)) | |
1284 | return 0; | |
1285 | ||
1286 | log_dhcp_server_errno(server, datagram_size, "Failed to determine datagram size to read, ignoring: %m"); | |
1287 | return 0; | |
1288 | } | |
11c38d3e YA |
1289 | |
1290 | size_t buflen = datagram_size; | |
1291 | if (sd_dhcp_server_is_in_relay_mode(server)) | |
19cc6d5e | 1292 | /* Preallocate the additional size for DHCP Relay Agent Information Option if needed */ |
11c38d3e | 1293 | buflen += relay_agent_information_length(server->agent_circuit_id, server->agent_remote_id) + 2; |
ff734080 | 1294 | |
0d43d2fc | 1295 | message = malloc(buflen); |
ff734080 TG |
1296 | if (!message) |
1297 | return -ENOMEM; | |
1298 | ||
11c38d3e | 1299 | iov = IOVEC_MAKE(message, datagram_size); |
ff734080 | 1300 | |
2efa5bc6 | 1301 | len = recvmsg_safe(fd, &msg, 0); |
8add30a0 | 1302 | if (len < 0) { |
ab8a8a4e | 1303 | if (ERRNO_IS_TRANSIENT(len) || ERRNO_IS_DISCONNECT(len)) |
8add30a0 | 1304 | return 0; |
ab8a8a4e YW |
1305 | |
1306 | log_dhcp_server_errno(server, len, "Could not receive message, ignoring: %m"); | |
1307 | return 0; | |
8add30a0 YW |
1308 | } |
1309 | ||
2efa5bc6 | 1310 | if ((size_t) len < sizeof(DHCPMessage)) |
be077570 | 1311 | return 0; |
ff734080 | 1312 | |
4f9dcf3d | 1313 | CMSG_FOREACH(cmsg, &msg) |
3a864fe4 TG |
1314 | if (cmsg->cmsg_level == IPPROTO_IP && |
1315 | cmsg->cmsg_type == IP_PKTINFO && | |
1316 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) { | |
1317 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg); | |
1318 | ||
a6f1e036 TG |
1319 | /* TODO figure out if this can be done as a filter on |
1320 | * the socket, like for IPv6 */ | |
b3ec603c | 1321 | if (server->ifindex != info->ipi_ifindex) |
3a864fe4 TG |
1322 | return 0; |
1323 | ||
1324 | break; | |
1325 | } | |
3a864fe4 | 1326 | |
c95df587 | 1327 | if (sd_dhcp_server_is_in_relay_mode(server)) { |
11c38d3e | 1328 | r = dhcp_server_relay_message(server, message, len - sizeof(DHCPMessage), buflen); |
c95df587 | 1329 | if (r < 0) |
ab8a8a4e | 1330 | log_dhcp_server_errno(server, r, "Couldn't relay message, ignoring: %m"); |
c95df587 YA |
1331 | } else { |
1332 | r = dhcp_server_handle_message(server, message, (size_t) len); | |
1333 | if (r < 0) | |
ab8a8a4e | 1334 | log_dhcp_server_errno(server, r, "Couldn't process incoming message, ignoring: %m"); |
c95df587 | 1335 | } |
57027d03 | 1336 | return 0; |
ff734080 TG |
1337 | } |
1338 | ||
c0fdc91e YW |
1339 | static void dhcp_server_update_lease_servers(sd_dhcp_server *server) { |
1340 | assert(server); | |
1341 | assert(server->address != 0); | |
1342 | ||
1343 | /* Convert null address -> server address */ | |
1344 | ||
1345 | for (sd_dhcp_lease_server_type_t k = 0; k < _SD_DHCP_LEASE_SERVER_TYPE_MAX; k++) | |
1346 | for (size_t i = 0; i < server->servers[k].size; i++) | |
1347 | if (in4_addr_is_null(&server->servers[k].addr[i])) | |
1348 | server->servers[k].addr[i].s_addr = server->address; | |
1349 | } | |
1350 | ||
ff734080 TG |
1351 | int sd_dhcp_server_start(sd_dhcp_server *server) { |
1352 | int r; | |
1353 | ||
1354 | assert_return(server, -EINVAL); | |
1355 | assert_return(server->event, -EINVAL); | |
b27e5d53 YW |
1356 | |
1357 | if (sd_dhcp_server_is_running(server)) | |
1358 | return 0; | |
1359 | ||
ff734080 | 1360 | assert_return(!server->receive_message, -EBUSY); |
cfcbb135 LP |
1361 | assert_return(server->fd_raw < 0, -EBUSY); |
1362 | assert_return(server->fd < 0, -EBUSY); | |
20af7091 | 1363 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH); |
ff734080 | 1364 | |
c0fdc91e YW |
1365 | dhcp_server_update_lease_servers(server); |
1366 | ||
3e29b889 | 1367 | r = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0); |
8de4a226 TG |
1368 | if (r < 0) { |
1369 | r = -errno; | |
21b6b87e | 1370 | goto on_error; |
8de4a226 TG |
1371 | } |
1372 | server->fd_raw = r; | |
1373 | ||
21b6b87e YA |
1374 | if (server->bind_to_interface) |
1375 | r = dhcp_network_bind_udp_socket(server->ifindex, INADDR_ANY, DHCP_PORT_SERVER, -1); | |
1376 | else | |
1377 | r = dhcp_network_bind_udp_socket(0, server->address, DHCP_PORT_SERVER, -1); | |
1378 | if (r < 0) | |
1379 | goto on_error; | |
ff734080 TG |
1380 | server->fd = r; |
1381 | ||
1382 | r = sd_event_add_io(server->event, &server->receive_message, | |
1383 | server->fd, EPOLLIN, | |
1384 | server_receive_message, server); | |
21b6b87e YA |
1385 | if (r < 0) |
1386 | goto on_error; | |
ff734080 TG |
1387 | |
1388 | r = sd_event_source_set_priority(server->receive_message, | |
1389 | server->event_priority); | |
21b6b87e YA |
1390 | if (r < 0) |
1391 | goto on_error; | |
1392 | ||
1393 | if (!server->bind_to_interface) { | |
1394 | r = dhcp_network_bind_udp_socket(server->ifindex, INADDR_BROADCAST, DHCP_PORT_SERVER, -1); | |
1395 | if (r < 0) | |
1396 | goto on_error; | |
1397 | ||
1398 | server->fd_broadcast = r; | |
1399 | ||
1400 | r = sd_event_add_io(server->event, &server->receive_broadcast, | |
1401 | server->fd_broadcast, EPOLLIN, | |
1402 | server_receive_message, server); | |
1403 | if (r < 0) | |
1404 | goto on_error; | |
1405 | ||
1406 | r = sd_event_source_set_priority(server->receive_broadcast, | |
1407 | server->event_priority); | |
1408 | if (r < 0) | |
1409 | goto on_error; | |
ff734080 TG |
1410 | } |
1411 | ||
1412 | log_dhcp_server(server, "STARTED"); | |
1413 | ||
1414 | return 0; | |
21b6b87e YA |
1415 | |
1416 | on_error: | |
37e21980 YW |
1417 | sd_dhcp_server_stop(server); |
1418 | return r; | |
ff734080 | 1419 | } |
52750344 TG |
1420 | |
1421 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { | |
b713a99b YW |
1422 | DHCPLease *lease; |
1423 | int k, r = 0; | |
52750344 TG |
1424 | |
1425 | assert_return(server, -EINVAL); | |
52750344 | 1426 | |
b713a99b | 1427 | log_dhcp_server(server, "FORCERENEW"); |
6408ba5f | 1428 | |
b713a99b | 1429 | HASHMAP_FOREACH(lease, server->bound_leases_by_client_id) { |
54d95d02 YW |
1430 | k = server_send_forcerenew(server, lease->address, lease->gateway, |
1431 | lease->htype, lease->hlen, lease->chaddr); | |
b713a99b YW |
1432 | if (k < 0) |
1433 | r = k; | |
52750344 TG |
1434 | } |
1435 | ||
1436 | return r; | |
1437 | } | |
8eb9058d | 1438 | |
21b6b87e YA |
1439 | int sd_dhcp_server_set_bind_to_interface(sd_dhcp_server *server, int enabled) { |
1440 | assert_return(server, -EINVAL); | |
1441 | assert_return(!sd_dhcp_server_is_running(server), -EBUSY); | |
1442 | ||
1443 | if (!!enabled == server->bind_to_interface) | |
1444 | return 0; | |
1445 | ||
1446 | server->bind_to_interface = enabled; | |
1447 | ||
1448 | return 1; | |
1449 | } | |
1450 | ||
64d6c229 | 1451 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { |
8eb9058d LP |
1452 | int r; |
1453 | ||
1454 | assert_return(server, -EINVAL); | |
089fb865 | 1455 | assert_return(timezone_is_valid(tz, LOG_DEBUG), -EINVAL); |
8eb9058d | 1456 | |
64d6c229 | 1457 | if (streq_ptr(tz, server->timezone)) |
8eb9058d LP |
1458 | return 0; |
1459 | ||
64d6c229 | 1460 | r = free_and_strdup(&server->timezone, tz); |
8eb9058d LP |
1461 | if (r < 0) |
1462 | return r; | |
1463 | ||
1464 | return 1; | |
1465 | } | |
586ac6f7 LP |
1466 | |
1467 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1468 | assert_return(server, -EINVAL); | |
1469 | ||
1470 | if (t == server->max_lease_time) | |
1471 | return 0; | |
1472 | ||
1473 | server->max_lease_time = t; | |
1474 | return 1; | |
1475 | } | |
1476 | ||
1477 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1478 | assert_return(server, -EINVAL); | |
1479 | ||
1480 | if (t == server->default_lease_time) | |
1481 | return 0; | |
1482 | ||
1483 | server->default_lease_time = t; | |
1484 | return 1; | |
1485 | } | |
1a04db0f | 1486 | |
c8407baf ZJS |
1487 | int sd_dhcp_server_set_servers( |
1488 | sd_dhcp_server *server, | |
2324fd3a | 1489 | sd_dhcp_lease_server_type_t what, |
c8407baf | 1490 | const struct in_addr addresses[], |
90810f7a | 1491 | size_t n_addresses) { |
1a04db0f | 1492 | |
ddb82ec2 LP |
1493 | struct in_addr *c = NULL; |
1494 | ||
1a04db0f | 1495 | assert_return(server, -EINVAL); |
c0fdc91e | 1496 | assert_return(!sd_dhcp_server_is_running(server), -EBUSY); |
c8407baf | 1497 | assert_return(addresses || n_addresses == 0, -EINVAL); |
ddb82ec2 LP |
1498 | assert_return(what >= 0, -EINVAL); |
1499 | assert_return(what < _SD_DHCP_LEASE_SERVER_TYPE_MAX, -EINVAL); | |
1a04db0f | 1500 | |
ddb82ec2 LP |
1501 | if (server->servers[what].size == n_addresses && |
1502 | memcmp(server->servers[what].addr, addresses, sizeof(struct in_addr) * n_addresses) == 0) | |
f678ac7e SS |
1503 | return 0; |
1504 | ||
c8407baf ZJS |
1505 | if (n_addresses > 0) { |
1506 | c = newdup(struct in_addr, addresses, n_addresses); | |
f678ac7e SS |
1507 | if (!c) |
1508 | return -ENOMEM; | |
f678ac7e SS |
1509 | } |
1510 | ||
c997f51c | 1511 | free_and_replace(server->servers[what].addr, c); |
ddb82ec2 | 1512 | server->servers[what].size = n_addresses; |
f678ac7e SS |
1513 | return 1; |
1514 | } | |
1515 | ||
90810f7a | 1516 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], size_t n) { |
ddb82ec2 | 1517 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_DNS, dns, n); |
c8407baf | 1518 | } |
90810f7a | 1519 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], size_t n) { |
ddb82ec2 | 1520 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_NTP, ntp, n); |
c8407baf | 1521 | } |
90810f7a | 1522 | int sd_dhcp_server_set_sip(sd_dhcp_server *server, const struct in_addr sip[], size_t n) { |
ddb82ec2 | 1523 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_SIP, sip, n); |
c8407baf | 1524 | } |
90810f7a | 1525 | int sd_dhcp_server_set_pop3(sd_dhcp_server *server, const struct in_addr pop3[], size_t n) { |
ddb82ec2 | 1526 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_POP3, pop3, n); |
c8407baf | 1527 | } |
90810f7a | 1528 | int sd_dhcp_server_set_smtp(sd_dhcp_server *server, const struct in_addr smtp[], size_t n) { |
ddb82ec2 | 1529 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_SMTP, smtp, n); |
2c649ca1 | 1530 | } |
90810f7a | 1531 | int sd_dhcp_server_set_lpr(sd_dhcp_server *server, const struct in_addr lpr[], size_t n) { |
ddb82ec2 | 1532 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_LPR, lpr, n); |
50018bfa | 1533 | } |
2c649ca1 | 1534 | |
59aa6220 | 1535 | int sd_dhcp_server_set_router(sd_dhcp_server *server, const struct in_addr *router) { |
77ff6022 CG |
1536 | assert_return(server, -EINVAL); |
1537 | ||
59aa6220 YW |
1538 | /* router is NULL: router option will not be appended. |
1539 | * router is null address (0.0.0.0): the server address will be used as the router address. | |
1540 | * otherwise: the specified address will be used as the router address.*/ | |
77ff6022 | 1541 | |
59aa6220 YW |
1542 | server->emit_router = router; |
1543 | if (router) | |
1544 | server->router_address = *router; | |
77ff6022 | 1545 | |
59aa6220 | 1546 | return 0; |
77ff6022 | 1547 | } |
564ca984 | 1548 | |
461dbb2f | 1549 | int sd_dhcp_server_add_option(sd_dhcp_server *server, sd_dhcp_option *v) { |
564ca984 SS |
1550 | int r; |
1551 | ||
1552 | assert_return(server, -EINVAL); | |
1553 | assert_return(v, -EINVAL); | |
1554 | ||
ebffea2a | 1555 | r = ordered_set_ensure_put(&server->extra_options, &dhcp_option_hash_ops, v); |
7354900d DW |
1556 | if (r < 0) |
1557 | return r; | |
1558 | ||
1559 | sd_dhcp_option_ref(v); | |
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | int sd_dhcp_server_add_vendor_option(sd_dhcp_server *server, sd_dhcp_option *v) { | |
1564 | int r; | |
1565 | ||
1566 | assert_return(server, -EINVAL); | |
1567 | assert_return(v, -EINVAL); | |
1568 | ||
ebffea2a | 1569 | r = ordered_set_ensure_put(&server->vendor_options, &dhcp_option_hash_ops, v); |
564ca984 SS |
1570 | if (r < 0) |
1571 | return r; | |
1572 | ||
461dbb2f | 1573 | sd_dhcp_option_ref(v); |
564ca984 SS |
1574 | |
1575 | return 1; | |
1576 | } | |
5b03043a MAL |
1577 | |
1578 | int sd_dhcp_server_set_callback(sd_dhcp_server *server, sd_dhcp_server_callback_t cb, void *userdata) { | |
1579 | assert_return(server, -EINVAL); | |
1580 | ||
1581 | server->callback = cb; | |
1582 | server->callback_userdata = userdata; | |
1583 | ||
1584 | return 0; | |
1585 | } | |
c95df587 | 1586 | |
11c38d3e | 1587 | int sd_dhcp_server_set_relay_target(sd_dhcp_server *server, const struct in_addr *address) { |
c95df587 YA |
1588 | assert_return(server, -EINVAL); |
1589 | assert_return(!sd_dhcp_server_is_running(server), -EBUSY); | |
1590 | ||
1591 | if (memcmp(address, &server->relay_target, sizeof(struct in_addr)) == 0) | |
1592 | return 0; | |
1593 | ||
1594 | server->relay_target = *address; | |
1595 | return 1; | |
1596 | } | |
11c38d3e YA |
1597 | |
1598 | int sd_dhcp_server_set_relay_agent_information( | |
1599 | sd_dhcp_server *server, | |
1600 | const char *agent_circuit_id, | |
1601 | const char *agent_remote_id) { | |
1602 | _cleanup_free_ char *circuit_id_dup = NULL, *remote_id_dup = NULL; | |
1603 | ||
1604 | assert_return(server, -EINVAL); | |
1605 | ||
1606 | if (relay_agent_information_length(agent_circuit_id, agent_remote_id) > UINT8_MAX) | |
1607 | return -ENOBUFS; | |
1608 | ||
1609 | if (agent_circuit_id) { | |
1610 | circuit_id_dup = strdup(agent_circuit_id); | |
1611 | if (!circuit_id_dup) | |
1612 | return -ENOMEM; | |
1613 | } | |
1614 | ||
1615 | if (agent_remote_id) { | |
1616 | remote_id_dup = strdup(agent_remote_id); | |
1617 | if (!remote_id_dup) | |
1618 | return -ENOMEM; | |
1619 | } | |
1620 | ||
1621 | free_and_replace(server->agent_circuit_id, circuit_id_dup); | |
1622 | free_and_replace(server->agent_remote_id, remote_id_dup); | |
1623 | return 0; | |
1624 | } | |
65a0ef23 | 1625 | |
1626 | int sd_dhcp_server_set_static_lease( | |
1627 | sd_dhcp_server *server, | |
1628 | const struct in_addr *address, | |
1629 | uint8_t *client_id, | |
1630 | size_t client_id_size) { | |
1631 | ||
b713a99b | 1632 | _cleanup_(dhcp_lease_freep) DHCPLease *lease = NULL; |
65a0ef23 | 1633 | int r; |
1634 | ||
1635 | assert_return(server, -EINVAL); | |
1636 | assert_return(client_id, -EINVAL); | |
a2a80192 | 1637 | assert_return(client_id_size > 0, -EINVAL); |
65a0ef23 | 1638 | assert_return(!sd_dhcp_server_is_running(server), -EBUSY); |
1639 | ||
1640 | /* Static lease with an empty or omitted address is a valid entry, | |
f4759ae0 | 1641 | * the server removes any static lease with the specified mac address. */ |
65a0ef23 | 1642 | if (!address || address->s_addr == 0) { |
b713a99b | 1643 | DHCPClientId c; |
65a0ef23 | 1644 | |
65a0ef23 | 1645 | c = (DHCPClientId) { |
1646 | .length = client_id_size, | |
f4759ae0 | 1647 | .data = client_id, |
65a0ef23 | 1648 | }; |
1649 | ||
8a7d048d | 1650 | dhcp_lease_free(hashmap_get(server->static_leases_by_client_id, &c)); |
65a0ef23 | 1651 | return 0; |
1652 | } | |
1653 | ||
65a0ef23 | 1654 | lease = new(DHCPLease, 1); |
1655 | if (!lease) | |
1656 | return -ENOMEM; | |
1657 | ||
1658 | *lease = (DHCPLease) { | |
1659 | .address = address->s_addr, | |
1660 | .client_id.length = client_id_size, | |
65a0ef23 | 1661 | }; |
1662 | lease->client_id.data = memdup(client_id, client_id_size); | |
1663 | if (!lease->client_id.data) | |
1664 | return -ENOMEM; | |
1665 | ||
8a7d048d YW |
1666 | lease->server = server; /* This must be set just before hashmap_put(). */ |
1667 | ||
65a0ef23 | 1668 | r = hashmap_ensure_put(&server->static_leases_by_client_id, &dhcp_lease_hash_ops, &lease->client_id, lease); |
b713a99b YW |
1669 | if (r < 0) |
1670 | return r; | |
1671 | r = hashmap_ensure_put(&server->static_leases_by_address, NULL, UINT32_TO_PTR(lease->address), lease); | |
65a0ef23 | 1672 | if (r < 0) |
1673 | return r; | |
1674 | ||
1675 | TAKE_PTR(lease); | |
1676 | return 0; | |
1677 | } |