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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" |
3ffd4af2 | 15 | #include "fd-util.h" |
07630cea | 16 | #include "in-addr-util.h" |
cb310866 | 17 | #include "io-util.h" |
61a9fa8f | 18 | #include "network-common.h" |
ebffea2a | 19 | #include "ordered-set.h" |
07630cea LP |
20 | #include "siphash24.h" |
21 | #include "string-util.h" | |
9ae84244 | 22 | #include "unaligned.h" |
b44cd882 | 23 | |
586ac6f7 LP |
24 | #define DHCP_DEFAULT_LEASE_TIME_USEC USEC_PER_HOUR |
25 | #define DHCP_MAX_LEASE_TIME_USEC (USEC_PER_HOUR*12) | |
4dc35568 | 26 | |
6121fc30 | 27 | static DHCPLease *dhcp_lease_free(DHCPLease *lease) { |
45a9eac9 | 28 | if (!lease) |
6121fc30 | 29 | return NULL; |
45a9eac9 RM |
30 | |
31 | free(lease->client_id.data); | |
6121fc30 | 32 | return mfree(lease); |
45a9eac9 RM |
33 | } |
34 | ||
65a0ef23 | 35 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPLease*, dhcp_lease_free); |
36 | ||
99634696 TG |
37 | /* configures the server's address and subnet, and optionally the pool's size and offset into the subnet |
38 | * the whole pool must fit into the subnet, and may not contain the first (any) nor last (broadcast) address | |
39 | * moreover, the server's own address may be in the pool, and is in that case reserved in order not to | |
40 | * accidentally hand it out */ | |
90810f7a LP |
41 | int sd_dhcp_server_configure_pool( |
42 | sd_dhcp_server *server, | |
43 | const struct in_addr *address, | |
44 | unsigned char prefixlen, | |
45 | uint32_t offset, | |
46 | uint32_t size) { | |
47 | ||
99634696 TG |
48 | struct in_addr netmask_addr; |
49 | be32_t netmask; | |
50 | uint32_t server_off, broadcast_off, size_max; | |
51 | ||
2dead812 TG |
52 | assert_return(server, -EINVAL); |
53 | assert_return(address, -EINVAL); | |
99634696 TG |
54 | assert_return(address->s_addr != INADDR_ANY, -EINVAL); |
55 | assert_return(prefixlen <= 32, -ERANGE); | |
99634696 | 56 | |
5a941f5f | 57 | assert_se(in4_addr_prefixlen_to_netmask(&netmask_addr, prefixlen)); |
99634696 TG |
58 | netmask = netmask_addr.s_addr; |
59 | ||
60 | server_off = be32toh(address->s_addr & ~netmask); | |
61 | broadcast_off = be32toh(~netmask); | |
62 | ||
63 | /* the server address cannot be the subnet address */ | |
64 | assert_return(server_off != 0, -ERANGE); | |
65 | ||
66 | /* nor the broadcast address */ | |
67 | assert_return(server_off != broadcast_off, -ERANGE); | |
68 | ||
69 | /* 0 offset means we should set a default, we skip the first (subnet) address | |
70 | and take the next one */ | |
71 | if (offset == 0) | |
72 | offset = 1; | |
73 | ||
74 | size_max = (broadcast_off + 1) /* the number of addresses in the subnet */ | |
75 | - offset /* exclude the addresses before the offset */ | |
76 | - 1; /* exclude the last (broadcast) address */ | |
77 | ||
78 | /* The pool must contain at least one address */ | |
79 | assert_return(size_max >= 1, -ERANGE); | |
80 | ||
81 | if (size != 0) | |
82 | assert_return(size <= size_max, -ERANGE); | |
83 | else | |
84 | size = size_max; | |
87322b3a | 85 | |
45a9eac9 | 86 | if (server->address != address->s_addr || server->netmask != netmask || server->pool_size != size || server->pool_offset != offset) { |
45a9eac9 RM |
87 | |
88 | free(server->bound_leases); | |
89 | server->bound_leases = new0(DHCPLease*, size); | |
90 | if (!server->bound_leases) | |
91 | return -ENOMEM; | |
2dead812 | 92 | |
45a9eac9 RM |
93 | server->pool_offset = offset; |
94 | server->pool_size = size; | |
2dead812 | 95 | |
45a9eac9 RM |
96 | server->address = address->s_addr; |
97 | server->netmask = netmask; | |
98 | server->subnet = address->s_addr & netmask; | |
99634696 | 99 | |
45a9eac9 RM |
100 | if (server_off >= offset && server_off - offset < size) |
101 | server->bound_leases[server_off - offset] = &server->invalid_lease; | |
102 | ||
103 | /* Drop any leases associated with the old address range */ | |
6121fc30 | 104 | hashmap_clear(server->leases_by_client_id); |
36d35f22 MAL |
105 | |
106 | if (server->callback) | |
107 | server->callback(server, SD_DHCP_SERVER_EVENT_LEASE_CHANGED, server->callback_userdata); | |
45a9eac9 | 108 | } |
20af7091 TG |
109 | |
110 | return 0; | |
111 | } | |
112 | ||
04c01369 | 113 | int sd_dhcp_server_is_running(sd_dhcp_server *server) { |
75677581 | 114 | assert_return(server, false); |
7c16313f TG |
115 | |
116 | return !!server->receive_message; | |
117 | } | |
118 | ||
c95df587 YA |
119 | int sd_dhcp_server_is_in_relay_mode(sd_dhcp_server *server) { |
120 | assert_return(server, -EINVAL); | |
121 | ||
122 | return in4_addr_is_set(&server->relay_target); | |
123 | } | |
124 | ||
7a08d314 | 125 | void client_id_hash_func(const DHCPClientId *id, struct siphash *state) { |
87322b3a TG |
126 | assert(id); |
127 | assert(id->length); | |
128 | assert(id->data); | |
129 | ||
1e2527a6 | 130 | siphash24_compress(&id->length, sizeof(id->length), state); |
b826ab58 | 131 | siphash24_compress(id->data, id->length, state); |
87322b3a TG |
132 | } |
133 | ||
7a08d314 | 134 | int client_id_compare_func(const DHCPClientId *a, const DHCPClientId *b) { |
a0edd02e | 135 | int r; |
87322b3a | 136 | |
87322b3a TG |
137 | assert(!a->length || a->data); |
138 | assert(!b->length || b->data); | |
139 | ||
a0edd02e FB |
140 | r = CMP(a->length, b->length); |
141 | if (r != 0) | |
142 | return r; | |
87322b3a TG |
143 | |
144 | return memcmp(a->data, b->data, a->length); | |
145 | } | |
146 | ||
6121fc30 YW |
147 | DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(dhcp_lease_hash_ops, DHCPClientId, client_id_hash_func, client_id_compare_func, |
148 | DHCPLease, dhcp_lease_free); | |
d5099efc | 149 | |
8301aa0b | 150 | static sd_dhcp_server *dhcp_server_free(sd_dhcp_server *server) { |
8301aa0b | 151 | assert(server); |
ff734080 | 152 | |
3bdace9b | 153 | log_dhcp_server(server, "UNREF"); |
87322b3a | 154 | |
3bdace9b | 155 | sd_dhcp_server_stop(server); |
87322b3a | 156 | |
3bdace9b LP |
157 | sd_event_unref(server->event); |
158 | ||
8eb9058d | 159 | free(server->timezone); |
ddb82ec2 | 160 | |
2324fd3a | 161 | for (sd_dhcp_lease_server_type_t i = 0; i < _SD_DHCP_LEASE_SERVER_TYPE_MAX; i++) |
ddb82ec2 | 162 | free(server->servers[i].addr); |
8eb9058d | 163 | |
3bdace9b | 164 | hashmap_free(server->leases_by_client_id); |
65a0ef23 | 165 | hashmap_free(server->static_leases_by_client_id); |
3bdace9b | 166 | |
ebffea2a SS |
167 | ordered_set_free(server->extra_options); |
168 | ordered_set_free(server->vendor_options); | |
564ca984 | 169 | |
11c38d3e YA |
170 | free(server->agent_circuit_id); |
171 | free(server->agent_remote_id); | |
172 | ||
3bdace9b | 173 | free(server->bound_leases); |
61a9fa8f YW |
174 | |
175 | free(server->ifname); | |
6b430fdb | 176 | return mfree(server); |
b44cd882 TG |
177 | } |
178 | ||
8301aa0b YW |
179 | DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_server, sd_dhcp_server, dhcp_server_free); |
180 | ||
3a864fe4 | 181 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
4afd3348 | 182 | _cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL; |
b44cd882 TG |
183 | |
184 | assert_return(ret, -EINVAL); | |
3a864fe4 | 185 | assert_return(ifindex > 0, -EINVAL); |
b44cd882 | 186 | |
61a9fa8f | 187 | server = new(sd_dhcp_server, 1); |
b44cd882 TG |
188 | if (!server) |
189 | return -ENOMEM; | |
190 | ||
61a9fa8f YW |
191 | *server = (sd_dhcp_server) { |
192 | .n_ref = 1, | |
193 | .fd_raw = -1, | |
194 | .fd = -1, | |
21b6b87e | 195 | .fd_broadcast = -1, |
61a9fa8f YW |
196 | .address = htobe32(INADDR_ANY), |
197 | .netmask = htobe32(INADDR_ANY), | |
198 | .ifindex = ifindex, | |
21b6b87e | 199 | .bind_to_interface = true, |
61a9fa8f YW |
200 | .default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC), |
201 | .max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC), | |
202 | }; | |
357e1b17 | 203 | |
6121fc30 | 204 | server->leases_by_client_id = hashmap_new(&dhcp_lease_hash_ops); |
357e1b17 LP |
205 | if (!server->leases_by_client_id) |
206 | return -ENOMEM; | |
65a0ef23 | 207 | server->static_leases_by_client_id = hashmap_new(&dhcp_lease_hash_ops); |
208 | if (!server->static_leases_by_client_id) | |
209 | return -ENOMEM; | |
357e1b17 | 210 | |
1cc6c93a | 211 | *ret = TAKE_PTR(server); |
b44cd882 TG |
212 | |
213 | return 0; | |
214 | } | |
215 | ||
61a9fa8f YW |
216 | int sd_dhcp_server_set_ifname(sd_dhcp_server *server, const char *ifname) { |
217 | assert_return(server, -EINVAL); | |
218 | assert_return(ifname, -EINVAL); | |
219 | ||
220 | if (!ifname_valid_full(ifname, IFNAME_VALID_ALTERNATIVE)) | |
221 | return -EINVAL; | |
222 | ||
223 | return free_and_strdup(&server->ifname, ifname); | |
224 | } | |
225 | ||
226 | const char *sd_dhcp_server_get_ifname(sd_dhcp_server *server) { | |
227 | if (!server) | |
228 | return NULL; | |
229 | ||
230 | return get_ifname(server->ifindex, &server->ifname); | |
231 | } | |
232 | ||
32d20645 | 233 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int64_t priority) { |
b44cd882 TG |
234 | int r; |
235 | ||
236 | assert_return(server, -EINVAL); | |
237 | assert_return(!server->event, -EBUSY); | |
238 | ||
239 | if (event) | |
240 | server->event = sd_event_ref(event); | |
241 | else { | |
242 | r = sd_event_default(&server->event); | |
243 | if (r < 0) | |
244 | return r; | |
245 | } | |
246 | ||
247 | server->event_priority = priority; | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
253 | assert_return(server, -EINVAL); | |
254 | ||
255 | server->event = sd_event_unref(server->event); | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
261 | assert_return(server, NULL); | |
262 | ||
263 | return server->event; | |
264 | } | |
ff734080 TG |
265 | |
266 | int sd_dhcp_server_stop(sd_dhcp_server *server) { | |
c8bae363 YW |
267 | if (!server) |
268 | return 0; | |
ff734080 | 269 | |
21b6b87e YA |
270 | server->receive_message = sd_event_source_unref(server->receive_message); |
271 | server->receive_broadcast = sd_event_source_unref(server->receive_broadcast); | |
ff734080 | 272 | |
8de4a226 | 273 | server->fd_raw = safe_close(server->fd_raw); |
ff734080 | 274 | server->fd = safe_close(server->fd); |
21b6b87e | 275 | server->fd_broadcast = safe_close(server->fd_broadcast); |
ff734080 TG |
276 | |
277 | log_dhcp_server(server, "STOPPED"); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
a6f1e036 TG |
282 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
283 | DHCPPacket *packet, size_t len) { | |
969b009d TG |
284 | union sockaddr_union link = { |
285 | .ll.sll_family = AF_PACKET, | |
8e38570e | 286 | .ll.sll_protocol = htobe16(ETH_P_IP), |
b3ec603c | 287 | .ll.sll_ifindex = server->ifindex, |
969b009d TG |
288 | .ll.sll_halen = ETH_ALEN, |
289 | }; | |
969b009d TG |
290 | |
291 | assert(server); | |
b3ec603c | 292 | assert(server->ifindex > 0); |
969b009d TG |
293 | assert(server->address); |
294 | assert(packet); | |
295 | assert(len > sizeof(DHCPPacket)); | |
296 | ||
297 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN); | |
298 | ||
299 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, | |
a6f1e036 | 300 | packet->dhcp.yiaddr, |
afe42aef | 301 | DHCP_PORT_CLIENT, len, -1); |
969b009d | 302 | |
b3ec603c | 303 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
969b009d TG |
304 | } |
305 | ||
306 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
8eb7b6a5 | 307 | uint16_t destination_port, |
969b009d TG |
308 | DHCPMessage *message, size_t len) { |
309 | union sockaddr_union dest = { | |
310 | .in.sin_family = AF_INET, | |
8eb7b6a5 | 311 | .in.sin_port = htobe16(destination_port), |
969b009d TG |
312 | .in.sin_addr.s_addr = destination, |
313 | }; | |
314 | struct iovec iov = { | |
315 | .iov_base = message, | |
316 | .iov_len = len, | |
317 | }; | |
fb29cdbe | 318 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in_pktinfo))) control = {}; |
969b009d TG |
319 | struct msghdr msg = { |
320 | .msg_name = &dest, | |
321 | .msg_namelen = sizeof(dest.in), | |
322 | .msg_iov = &iov, | |
323 | .msg_iovlen = 1, | |
969b009d TG |
324 | }; |
325 | struct cmsghdr *cmsg; | |
326 | struct in_pktinfo *pktinfo; | |
969b009d TG |
327 | |
328 | assert(server); | |
4c9cb12c | 329 | assert(server->fd >= 0); |
969b009d TG |
330 | assert(message); |
331 | assert(len > sizeof(DHCPMessage)); | |
332 | ||
21b6b87e YA |
333 | if (server->bind_to_interface) { |
334 | msg.msg_control = &control; | |
335 | msg.msg_controllen = sizeof(control); | |
969b009d | 336 | |
21b6b87e YA |
337 | cmsg = CMSG_FIRSTHDR(&msg); |
338 | assert(cmsg); | |
969b009d | 339 | |
21b6b87e YA |
340 | cmsg->cmsg_level = IPPROTO_IP; |
341 | cmsg->cmsg_type = IP_PKTINFO; | |
342 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
969b009d | 343 | |
21b6b87e YA |
344 | /* we attach source interface and address info to the message |
345 | rather than binding the socket. This will be mostly useful | |
346 | when we gain support for arbitrary number of server addresses | |
347 | */ | |
348 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
349 | assert(pktinfo); | |
350 | ||
351 | pktinfo->ipi_ifindex = server->ifindex; | |
352 | pktinfo->ipi_spec_dst.s_addr = server->address; | |
353 | } | |
969b009d | 354 | |
0f01c1f9 | 355 | if (sendmsg(server->fd, &msg, 0) < 0) |
969b009d TG |
356 | return -errno; |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
c95df587 YA |
361 | static bool requested_broadcast(DHCPMessage *message) { |
362 | assert(message); | |
363 | return message->flags & htobe16(0x8000); | |
364 | } | |
969b009d | 365 | |
c95df587 YA |
366 | static int dhcp_server_send(sd_dhcp_server *server, be32_t destination, uint16_t destination_port, |
367 | DHCPPacket *packet, size_t optoffset, bool l2_broadcast) { | |
368 | if (destination != INADDR_ANY) | |
369 | return dhcp_server_send_udp(server, destination, | |
370 | destination_port, &packet->dhcp, | |
371 | sizeof(DHCPMessage) + optoffset); | |
372 | else if (l2_broadcast) | |
373 | return dhcp_server_send_udp(server, INADDR_BROADCAST, | |
374 | destination_port, &packet->dhcp, | |
375 | sizeof(DHCPMessage) + optoffset); | |
376 | else | |
377 | /* we cannot send UDP packet to specific MAC address when the | |
378 | address is not yet configured, so must fall back to raw | |
379 | packets */ | |
380 | return dhcp_server_send_unicast_raw(server, packet, | |
381 | sizeof(DHCPPacket) + optoffset); | |
969b009d TG |
382 | } |
383 | ||
384 | int dhcp_server_send_packet(sd_dhcp_server *server, | |
385 | DHCPRequest *req, DHCPPacket *packet, | |
386 | int type, size_t optoffset) { | |
387 | be32_t destination = INADDR_ANY; | |
8eb7b6a5 | 388 | uint16_t destination_port = DHCP_PORT_CLIENT; |
969b009d TG |
389 | int r; |
390 | ||
391 | assert(server); | |
392 | assert(req); | |
393 | assert(req->max_optlen); | |
11c38d3e | 394 | assert(req->message); |
969b009d TG |
395 | assert(optoffset <= req->max_optlen); |
396 | assert(packet); | |
397 | ||
398 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 399 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
969b009d TG |
400 | 4, &server->address); |
401 | if (r < 0) | |
402 | return r; | |
403 | ||
11c38d3e YA |
404 | if (req->agent_info_option) { |
405 | size_t opt_full_length = *(req->agent_info_option + 1) + 2; | |
406 | /* there must be space left for SD_DHCP_OPTION_END */ | |
407 | if (optoffset + opt_full_length < req->max_optlen) { | |
408 | memcpy(packet->dhcp.options + optoffset, req->agent_info_option, opt_full_length); | |
409 | optoffset += opt_full_length; | |
410 | } | |
411 | } | |
412 | ||
969b009d | 413 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, |
22805d92 | 414 | SD_DHCP_OPTION_END, 0, NULL); |
969b009d TG |
415 | if (r < 0) |
416 | return r; | |
417 | ||
418 | /* RFC 2131 Section 4.1 | |
419 | ||
420 | If the ’giaddr’ field in a DHCP message from a client is non-zero, | |
421 | the server sends any return messages to the ’DHCP server’ port on the | |
422 | BOOTP relay agent whose address appears in ’giaddr’. If the ’giaddr’ | |
423 | field is zero and the ’ciaddr’ field is nonzero, then the server | |
424 | unicasts DHCPOFFER and DHCPACK messages to the address in ’ciaddr’. | |
425 | If ’giaddr’ is zero and ’ciaddr’ is zero, and the broadcast bit is | |
426 | set, then the server broadcasts DHCPOFFER and DHCPACK messages to | |
427 | 0xffffffff. If the broadcast bit is not set and ’giaddr’ is zero and | |
428 | ’ciaddr’ is zero, then the server unicasts DHCPOFFER and DHCPACK | |
429 | messages to the client’s hardware address and ’yiaddr’ address. In | |
430 | all cases, when ’giaddr’ is zero, the server broadcasts any DHCPNAK | |
431 | messages to 0xffffffff. | |
432 | ||
433 | Section 4.3.2 | |
434 | ||
435 | If ’giaddr’ is set in the DHCPREQUEST message, the client is on a | |
436 | different subnet. The server MUST set the broadcast bit in the | |
437 | DHCPNAK, so that the relay agent will broadcast the DHCPNAK to the | |
438 | client, because the client may not have a correct network address | |
439 | or subnet mask, and the client may not be answering ARP requests. | |
440 | */ | |
441 | if (req->message->giaddr) { | |
442 | destination = req->message->giaddr; | |
8eb7b6a5 | 443 | destination_port = DHCP_PORT_SERVER; |
969b009d TG |
444 | if (type == DHCP_NAK) |
445 | packet->dhcp.flags = htobe16(0x8000); | |
446 | } else if (req->message->ciaddr && type != DHCP_NAK) | |
447 | destination = req->message->ciaddr; | |
448 | ||
c95df587 YA |
449 | bool l2_broadcast = requested_broadcast(req->message) || type == DHCP_NAK; |
450 | return dhcp_server_send(server, destination, destination_port, packet, optoffset, l2_broadcast); | |
969b009d TG |
451 | } |
452 | ||
4dc35568 | 453 | static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret, |
a6f1e036 TG |
454 | uint8_t type, size_t *_optoffset, |
455 | DHCPRequest *req) { | |
4dc35568 | 456 | _cleanup_free_ DHCPPacket *packet = NULL; |
1231c4d2 | 457 | size_t optoffset = 0; |
4dc35568 TG |
458 | int r; |
459 | ||
460 | assert(server); | |
461 | assert(ret); | |
462 | assert(_optoffset); | |
bd57b450 | 463 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)); |
4dc35568 TG |
464 | |
465 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen); | |
466 | if (!packet) | |
467 | return -ENOMEM; | |
468 | ||
a6f1e036 | 469 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
76253e73 DW |
470 | be32toh(req->message->xid), type, ARPHRD_ETHER, |
471 | req->max_optlen, &optoffset); | |
4dc35568 TG |
472 | if (r < 0) |
473 | return r; | |
474 | ||
475 | packet->dhcp.flags = req->message->flags; | |
476 | packet->dhcp.giaddr = req->message->giaddr; | |
477 | memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN); | |
478 | ||
479 | *_optoffset = optoffset; | |
1cc6c93a | 480 | *ret = TAKE_PTR(packet); |
4dc35568 TG |
481 | |
482 | return 0; | |
483 | } | |
484 | ||
986c0edf | 485 | static int server_send_offer_or_ack( |
ddb82ec2 LP |
486 | sd_dhcp_server *server, |
487 | DHCPRequest *req, | |
986c0edf YW |
488 | be32_t address, |
489 | uint8_t type) { | |
ddb82ec2 | 490 | |
2dead812 | 491 | _cleanup_free_ DHCPPacket *packet = NULL; |
7354900d | 492 | sd_dhcp_option *j; |
986c0edf | 493 | be32_t lease_time; |
564ca984 | 494 | size_t offset; |
2dead812 TG |
495 | int r; |
496 | ||
986c0edf YW |
497 | assert(server); |
498 | assert(req); | |
499 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK)); | |
500 | ||
501 | r = server_message_init(server, &packet, type, &offset, req); | |
2dead812 TG |
502 | if (r < 0) |
503 | return r; | |
504 | ||
505 | packet->dhcp.yiaddr = address; | |
506 | ||
c7d9ffe6 | 507 | lease_time = htobe32(req->lifetime); |
2dead812 | 508 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 509 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 510 | &lease_time); |
2dead812 TG |
511 | if (r < 0) |
512 | return r; | |
513 | ||
59b8f6b6 | 514 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 515 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
516 | if (r < 0) |
517 | return r; | |
518 | ||
77ff6022 CG |
519 | if (server->emit_router) { |
520 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
521 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
522 | if (r < 0) | |
523 | return r; | |
524 | } | |
59b8f6b6 | 525 | |
986c0edf YW |
526 | if (type == DHCP_ACK) { |
527 | static const uint8_t option_map[_SD_DHCP_LEASE_SERVER_TYPE_MAX] = { | |
528 | [SD_DHCP_LEASE_DNS] = SD_DHCP_OPTION_DOMAIN_NAME_SERVER, | |
529 | [SD_DHCP_LEASE_NTP] = SD_DHCP_OPTION_NTP_SERVER, | |
530 | [SD_DHCP_LEASE_SIP] = SD_DHCP_OPTION_SIP_SERVER, | |
531 | [SD_DHCP_LEASE_POP3] = SD_DHCP_OPTION_POP3_SERVER, | |
532 | [SD_DHCP_LEASE_SMTP] = SD_DHCP_OPTION_SMTP_SERVER, | |
533 | [SD_DHCP_LEASE_LPR] = SD_DHCP_OPTION_LPR_SERVER, | |
534 | }; | |
535 | ||
536 | for (sd_dhcp_lease_server_type_t k = 0; k < _SD_DHCP_LEASE_SERVER_TYPE_MAX; k++) { | |
537 | if (server->servers[k].size <= 0) | |
538 | continue; | |
539 | ||
540 | r = dhcp_option_append( | |
541 | &packet->dhcp, req->max_optlen, &offset, 0, | |
542 | option_map[k], | |
543 | sizeof(struct in_addr) * server->servers[k].size, | |
544 | server->servers[k].addr); | |
545 | if (r < 0) | |
546 | return r; | |
547 | } | |
2c649ca1 | 548 | |
50018bfa | 549 | |
986c0edf YW |
550 | if (server->timezone) { |
551 | r = dhcp_option_append( | |
552 | &packet->dhcp, req->max_optlen, &offset, 0, | |
553 | SD_DHCP_OPTION_NEW_TZDB_TIMEZONE, | |
554 | strlen(server->timezone), server->timezone); | |
555 | if (r < 0) | |
556 | return r; | |
557 | } | |
8eb9058d LP |
558 | } |
559 | ||
ebffea2a | 560 | ORDERED_SET_FOREACH(j, server->extra_options) { |
7354900d DW |
561 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
562 | j->option, j->length, j->data); | |
563 | if (r < 0) | |
564 | return r; | |
565 | } | |
566 | ||
ebffea2a | 567 | if (!ordered_set_isempty(server->vendor_options)) { |
564ca984 SS |
568 | r = dhcp_option_append( |
569 | &packet->dhcp, req->max_optlen, &offset, 0, | |
570 | SD_DHCP_OPTION_VENDOR_SPECIFIC, | |
ebffea2a | 571 | ordered_set_size(server->vendor_options), server->vendor_options); |
564ca984 SS |
572 | if (r < 0) |
573 | return r; | |
574 | } | |
575 | ||
986c0edf | 576 | r = dhcp_server_send_packet(server, req, packet, type, offset); |
2dead812 TG |
577 | if (r < 0) |
578 | return r; | |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
bd57b450 TG |
583 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { |
584 | _cleanup_free_ DHCPPacket *packet = NULL; | |
585 | size_t offset; | |
586 | int r; | |
587 | ||
588 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); | |
589 | if (r < 0) | |
590 | return r; | |
591 | ||
b3ec603c | 592 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
bd57b450 TG |
593 | } |
594 | ||
a6f1e036 | 595 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
141261f1 | 596 | be32_t gateway, const uint8_t chaddr[]) { |
52750344 TG |
597 | _cleanup_free_ DHCPPacket *packet = NULL; |
598 | size_t optoffset = 0; | |
599 | int r; | |
600 | ||
601 | assert(server); | |
602 | assert(address != INADDR_ANY); | |
603 | assert(chaddr); | |
604 | ||
605 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
606 | if (!packet) | |
607 | return -ENOMEM; | |
608 | ||
609 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
76253e73 DW |
610 | DHCP_FORCERENEW, ARPHRD_ETHER, |
611 | DHCP_MIN_OPTIONS_SIZE, &optoffset); | |
52750344 TG |
612 | if (r < 0) |
613 | return r; | |
614 | ||
615 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
22805d92 | 616 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL); |
52750344 TG |
617 | if (r < 0) |
618 | return r; | |
619 | ||
620 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); | |
621 | ||
8eb7b6a5 PF |
622 | r = dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, |
623 | &packet->dhcp, | |
52750344 | 624 | sizeof(DHCPMessage) + optoffset); |
c15fb62a TA |
625 | if (r < 0) |
626 | return r; | |
52750344 TG |
627 | |
628 | return 0; | |
629 | } | |
630 | ||
b3ec603c | 631 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
89ca10c6 | 632 | DHCPRequest *req = userdata; |
816e2e7a TG |
633 | |
634 | assert(req); | |
635 | ||
636 | switch(code) { | |
22805d92 | 637 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
c7d9ffe6 | 638 | if (len == 4) |
9ae84244 | 639 | req->lifetime = unaligned_read_be32(option); |
c7d9ffe6 TG |
640 | |
641 | break; | |
22805d92 | 642 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
2dead812 | 643 | if (len == 4) |
9ae84244 | 644 | memcpy(&req->requested_ip, option, sizeof(be32_t)); |
2dead812 TG |
645 | |
646 | break; | |
22805d92 | 647 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
816e2e7a | 648 | if (len == 4) |
9ae84244 | 649 | memcpy(&req->server_id, option, sizeof(be32_t)); |
816e2e7a TG |
650 | |
651 | break; | |
22805d92 | 652 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
816e2e7a TG |
653 | if (len >= 2) { |
654 | uint8_t *data; | |
655 | ||
656 | data = memdup(option, len); | |
657 | if (!data) | |
658 | return -ENOMEM; | |
659 | ||
660 | free(req->client_id.data); | |
661 | req->client_id.data = data; | |
662 | req->client_id.length = len; | |
663 | } | |
664 | ||
665 | break; | |
22805d92 | 666 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
76a9d0f1 LP |
667 | |
668 | if (len == 2 && unaligned_read_be16(option) >= sizeof(DHCPPacket)) | |
9ae84244 | 669 | req->max_optlen = unaligned_read_be16(option) - sizeof(DHCPPacket); |
816e2e7a | 670 | |
11c38d3e YA |
671 | break; |
672 | case SD_DHCP_OPTION_RELAY_AGENT_INFORMATION: | |
673 | req->agent_info_option = (uint8_t*)option - 2; | |
674 | ||
816e2e7a TG |
675 | break; |
676 | } | |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
75db809a | 681 | static DHCPRequest* dhcp_request_free(DHCPRequest *req) { |
816e2e7a | 682 | if (!req) |
75db809a | 683 | return NULL; |
816e2e7a TG |
684 | |
685 | free(req->client_id.data); | |
75db809a | 686 | return mfree(req); |
816e2e7a TG |
687 | } |
688 | ||
689 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
816e2e7a | 690 | |
586ac6f7 | 691 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
816e2e7a TG |
692 | assert(req); |
693 | assert(message); | |
694 | ||
695 | req->message = message; | |
696 | ||
e2acdb6b | 697 | /* set client id based on MAC address if client did not send an explicit |
a6f1e036 | 698 | one */ |
816e2e7a | 699 | if (!req->client_id.data) { |
9a0f246f | 700 | void *data; |
816e2e7a | 701 | |
9a0f246f | 702 | data = malloc0(ETH_ALEN + 1); |
816e2e7a TG |
703 | if (!data) |
704 | return -ENOMEM; | |
705 | ||
9a0f246f LP |
706 | ((uint8_t*) data)[0] = 0x01; |
707 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN); | |
708 | ||
816e2e7a TG |
709 | req->client_id.length = ETH_ALEN + 1; |
710 | req->client_id.data = data; | |
816e2e7a TG |
711 | } |
712 | ||
713 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) | |
714 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
715 | ||
9a0f246f | 716 | if (req->lifetime <= 0) |
586ac6f7 LP |
717 | req->lifetime = MAX(1ULL, server->default_lease_time); |
718 | ||
719 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
720 | req->lifetime = server->max_lease_time; | |
c7d9ffe6 | 721 | |
816e2e7a TG |
722 | return 0; |
723 | } | |
724 | ||
87322b3a TG |
725 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { |
726 | assert(server); | |
727 | ||
728 | if (!server->pool_size) | |
729 | return -EINVAL; | |
730 | ||
99634696 TG |
731 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
732 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
733 | return -ERANGE; | |
87322b3a | 734 | |
99634696 | 735 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
87322b3a TG |
736 | } |
737 | ||
11c38d3e YA |
738 | static int append_agent_information_option(sd_dhcp_server *server, DHCPMessage *message, size_t opt_length, size_t size) { |
739 | int r; | |
740 | size_t offset; | |
741 | ||
742 | assert(server); | |
743 | assert(message); | |
744 | ||
745 | r = dhcp_option_find_option(message->options, opt_length, SD_DHCP_OPTION_END, &offset); | |
746 | if (r < 0) | |
747 | return r; | |
748 | ||
749 | r = dhcp_option_append(message, size, &offset, 0, SD_DHCP_OPTION_RELAY_AGENT_INFORMATION, 0, server); | |
750 | if (r < 0) | |
751 | return r; | |
752 | ||
753 | r = dhcp_option_append(message, size, &offset, 0, SD_DHCP_OPTION_END, 0, NULL); | |
754 | if (r < 0) | |
755 | return r; | |
756 | return offset; | |
757 | } | |
758 | ||
759 | static int dhcp_server_relay_message(sd_dhcp_server *server, DHCPMessage *message, size_t opt_length, size_t buflen) { | |
c95df587 | 760 | _cleanup_free_ DHCPPacket *packet = NULL; |
11c38d3e | 761 | int r; |
c95df587 YA |
762 | |
763 | assert(server); | |
764 | assert(message); | |
765 | assert(sd_dhcp_server_is_in_relay_mode(server)); | |
766 | ||
767 | if (message->op == BOOTREQUEST) { | |
768 | log_dhcp_server(server, "(relay agent) BOOTREQUEST (0x%x)", be32toh(message->xid)); | |
769 | if (message->hops >= 16) | |
770 | return -ETIME; | |
771 | message->hops++; | |
772 | ||
773 | /* https://tools.ietf.org/html/rfc1542#section-4.1.1 */ | |
774 | if (message->giaddr == 0) | |
775 | message->giaddr = server->address; | |
776 | ||
11c38d3e YA |
777 | if (server->agent_circuit_id || server->agent_remote_id) { |
778 | r = append_agent_information_option(server, message, opt_length, buflen - sizeof(DHCPMessage)); | |
779 | if (r < 0) | |
780 | return log_dhcp_server_errno(server, r, "could not append relay option: %m"); | |
781 | opt_length = r; | |
782 | } | |
783 | ||
c95df587 YA |
784 | return dhcp_server_send_udp(server, server->relay_target.s_addr, DHCP_PORT_SERVER, message, sizeof(DHCPMessage) + opt_length); |
785 | } else if (message->op == BOOTREPLY) { | |
786 | log_dhcp_server(server, "(relay agent) BOOTREPLY (0x%x)", be32toh(message->xid)); | |
11c38d3e | 787 | if (message->giaddr != server->address) |
c95df587 | 788 | return log_dhcp_server_errno(server, SYNTHETIC_ERRNO(EBADMSG), |
11c38d3e | 789 | "(relay agent) BOOTREPLY giaddr mismatch, discarding"); |
c95df587 YA |
790 | |
791 | int message_type = dhcp_option_parse(message, sizeof(DHCPMessage) + opt_length, NULL, NULL, NULL); | |
792 | if (message_type < 0) | |
793 | return message_type; | |
794 | ||
795 | packet = malloc0(sizeof(DHCPPacket) + opt_length); | |
796 | if (!packet) | |
797 | return -ENOMEM; | |
798 | memcpy(&packet->dhcp, message, sizeof(DHCPMessage) + opt_length); | |
799 | ||
11c38d3e YA |
800 | r = dhcp_option_remove_option(packet->dhcp.options, opt_length, SD_DHCP_OPTION_RELAY_AGENT_INFORMATION); |
801 | if (r > 0) | |
802 | opt_length = r; | |
803 | ||
c95df587 YA |
804 | bool l2_broadcast = requested_broadcast(message) || message_type == DHCP_NAK; |
805 | const be32_t destination = message_type == DHCP_NAK ? INADDR_ANY : message->ciaddr; | |
806 | return dhcp_server_send(server, destination, DHCP_PORT_CLIENT, packet, opt_length, l2_broadcast); | |
807 | } | |
808 | return -EBADMSG; | |
809 | } | |
810 | ||
65a0ef23 | 811 | static int prepare_new_lease( |
812 | DHCPLease **ret_lease, | |
813 | be32_t address, | |
814 | const DHCPClientId *client_id, | |
815 | const uint8_t chaddr[static ETH_ALEN], | |
816 | be32_t gateway, | |
817 | usec_t expiration) { | |
818 | ||
819 | _cleanup_(dhcp_lease_freep) DHCPLease *lease = NULL; | |
820 | ||
821 | lease = new(DHCPLease, 1); | |
822 | if (!lease) | |
823 | return -ENOMEM; | |
824 | ||
825 | *lease = (DHCPLease) { | |
826 | .address = address, | |
827 | .client_id.length = client_id->length, | |
828 | .gateway = gateway, | |
829 | .expiration = expiration, | |
830 | }; | |
831 | lease->client_id.data = memdup(client_id->data, client_id->length); | |
832 | if (!lease->client_id.data) | |
833 | return -ENOMEM; | |
834 | ||
835 | memcpy(&lease->chaddr, chaddr, ETH_ALEN); | |
836 | ||
837 | *ret_lease = TAKE_PTR(lease); | |
838 | ||
839 | return 0; | |
840 | } | |
841 | ||
842 | static bool static_leases_have_address(sd_dhcp_server *server, be32_t address) { | |
843 | DHCPLease *s; | |
844 | ||
845 | assert(server); | |
846 | ||
847 | HASHMAP_FOREACH(s, server->static_leases_by_client_id) | |
848 | if (s->address == address) | |
849 | return true; | |
850 | ||
851 | return false; | |
852 | } | |
853 | ||
83cedf7a TG |
854 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
855 | ||
65a0ef23 | 856 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, size_t length) { |
8e766630 | 857 | _cleanup_(dhcp_request_freep) DHCPRequest *req = NULL; |
f693e9b3 | 858 | _cleanup_free_ char *error_message = NULL; |
65a0ef23 | 859 | DHCPLease *existing_lease, *static_lease; |
816e2e7a | 860 | int type, r; |
be077570 TG |
861 | |
862 | assert(server); | |
863 | assert(message); | |
864 | ||
865 | if (message->op != BOOTREQUEST || | |
866 | message->htype != ARPHRD_ETHER || | |
867 | message->hlen != ETHER_ADDR_LEN) | |
868 | return 0; | |
869 | ||
816e2e7a TG |
870 | req = new0(DHCPRequest, 1); |
871 | if (!req) | |
872 | return -ENOMEM; | |
873 | ||
f693e9b3 | 874 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
be077570 TG |
875 | if (type < 0) |
876 | return 0; | |
877 | ||
586ac6f7 | 878 | r = ensure_sane_request(server, req, message); |
816e2e7a TG |
879 | if (r < 0) |
880 | /* this only fails on critical errors */ | |
881 | return r; | |
882 | ||
65a0ef23 | 883 | existing_lease = hashmap_get(server->leases_by_client_id, &req->client_id); |
884 | static_lease = hashmap_get(server->static_leases_by_client_id, &req->client_id); | |
87322b3a | 885 | |
4dc35568 | 886 | switch(type) { |
9a0f246f LP |
887 | |
888 | case DHCP_DISCOVER: { | |
87322b3a TG |
889 | be32_t address = INADDR_ANY; |
890 | unsigned i; | |
2dead812 | 891 | |
65a0ef23 | 892 | log_dhcp_server(server, "DISCOVER (0x%x)", be32toh(req->message->xid)); |
4dc35568 | 893 | |
2dead812 TG |
894 | if (!server->pool_size) |
895 | /* no pool allocated */ | |
896 | return 0; | |
897 | ||
87322b3a | 898 | /* for now pick a random free address from the pool */ |
65a0ef23 | 899 | if (static_lease) |
900 | address = static_lease->address; | |
901 | else if (existing_lease) | |
87322b3a TG |
902 | address = existing_lease->address; |
903 | else { | |
b826ab58 | 904 | struct siphash state; |
0cb3c286 | 905 | uint64_t hash; |
99634696 | 906 | uint32_t next_offer; |
83cedf7a TG |
907 | |
908 | /* even with no persistence of leases, we try to offer the same client | |
909 | the same IP address. we do this by using the hash of the client id | |
910 | as the offset into the pool of leases when finding the next free one */ | |
911 | ||
0cb3c286 | 912 | siphash24_init(&state, HASH_KEY.bytes); |
b826ab58 | 913 | client_id_hash_func(&req->client_id, &state); |
933f9cae | 914 | hash = htole64(siphash24_finalize(&state)); |
0cb3c286 | 915 | next_offer = hash % server->pool_size; |
83cedf7a | 916 | |
87322b3a | 917 | for (i = 0; i < server->pool_size; i++) { |
83cedf7a | 918 | if (!server->bound_leases[next_offer]) { |
65a0ef23 | 919 | be32_t tmp = server->subnet | htobe32(server->pool_offset + next_offer); |
920 | if (!static_leases_have_address(server, tmp)) { | |
921 | address = tmp; | |
922 | break; | |
923 | } | |
6408ba5f LP |
924 | } |
925 | ||
926 | next_offer = (next_offer + 1) % server->pool_size; | |
87322b3a TG |
927 | } |
928 | } | |
929 | ||
930 | if (address == INADDR_ANY) | |
931 | /* no free addresses left */ | |
932 | return 0; | |
2dead812 | 933 | |
986c0edf | 934 | r = server_send_offer_or_ack(server, req, address, DHCP_OFFER); |
6e741541 | 935 | if (r < 0) |
4dc35568 | 936 | /* this only fails on critical errors */ |
6e741541 | 937 | return log_dhcp_server_errno(server, r, "Could not send offer: %m"); |
be077570 | 938 | |
6e741541 LP |
939 | log_dhcp_server(server, "OFFER (0x%x)", be32toh(req->message->xid)); |
940 | return DHCP_OFFER; | |
4dc35568 | 941 | } |
5b34277c | 942 | case DHCP_DECLINE: |
f693e9b3 | 943 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message)); |
5b34277c TG |
944 | |
945 | /* TODO: make sure we don't offer this address again */ | |
946 | ||
947 | return 1; | |
948 | ||
9a0f246f | 949 | case DHCP_REQUEST: { |
2dead812 | 950 | be32_t address; |
bd57b450 | 951 | bool init_reboot = false; |
87322b3a | 952 | int pool_offset; |
2dead812 TG |
953 | |
954 | /* see RFC 2131, section 4.3.2 */ | |
955 | ||
956 | if (req->server_id) { | |
957 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", | |
958 | be32toh(req->message->xid)); | |
959 | ||
960 | /* SELECTING */ | |
961 | if (req->server_id != server->address) | |
962 | /* client did not pick us */ | |
963 | return 0; | |
964 | ||
965 | if (req->message->ciaddr) | |
966 | /* this MUST be zero */ | |
967 | return 0; | |
968 | ||
969 | if (!req->requested_ip) | |
970 | /* this must be filled in with the yiaddr | |
971 | from the chosen OFFER */ | |
972 | return 0; | |
973 | ||
974 | address = req->requested_ip; | |
975 | } else if (req->requested_ip) { | |
976 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", | |
977 | be32toh(req->message->xid)); | |
978 | ||
979 | /* INIT-REBOOT */ | |
980 | if (req->message->ciaddr) | |
981 | /* this MUST be zero */ | |
982 | return 0; | |
983 | ||
bd57b450 | 984 | /* TODO: check more carefully if IP is correct */ |
2dead812 | 985 | address = req->requested_ip; |
bd57b450 | 986 | init_reboot = true; |
2dead812 TG |
987 | } else { |
988 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
989 | be32toh(req->message->xid)); | |
990 | ||
991 | /* REBINDING / RENEWING */ | |
992 | if (!req->message->ciaddr) | |
993 | /* this MUST be filled in with clients IP address */ | |
994 | return 0; | |
995 | ||
996 | address = req->message->ciaddr; | |
997 | } | |
998 | ||
87322b3a TG |
999 | pool_offset = get_pool_offset(server, address); |
1000 | ||
1001 | /* verify that the requested address is from the pool, and either | |
1002 | owned by the current client or free */ | |
65a0ef23 | 1003 | if (pool_offset >= 0 && static_lease) { |
1004 | _cleanup_(dhcp_lease_freep) DHCPLease *lease = NULL, *old_lease = NULL; | |
1005 | usec_t time_now, expiration; | |
87322b3a | 1006 | |
65a0ef23 | 1007 | r = sd_event_now(server->event, clock_boottime_or_monotonic(), &time_now); |
1008 | if (r < 0) | |
38a03f06 | 1009 | return r; |
bff92d2c | 1010 | |
65a0ef23 | 1011 | expiration = usec_add(req->lifetime * USEC_PER_SEC, time_now); |
1012 | ||
1013 | r = prepare_new_lease(&lease, static_lease->address, &req->client_id, | |
1014 | req->message->chaddr, req->message->giaddr, expiration); | |
1015 | if (r < 0) | |
1016 | return r; | |
87322b3a | 1017 | |
986c0edf | 1018 | r = server_send_offer_or_ack(server, req, address, DHCP_ACK); |
65a0ef23 | 1019 | if (r < 0) |
2dead812 | 1020 | /* this only fails on critical errors */ |
65a0ef23 | 1021 | return log_dhcp_server_errno(server, r, "Could not send ack: %m"); |
87322b3a | 1022 | |
65a0ef23 | 1023 | log_dhcp_server(server, "ACK (0x%x)", be32toh(req->message->xid)); |
87322b3a | 1024 | |
65a0ef23 | 1025 | server->bound_leases[pool_offset] = lease; |
1026 | ||
1027 | old_lease = hashmap_remove(server->leases_by_client_id, &lease->client_id); | |
1028 | r = hashmap_put(server->leases_by_client_id, &lease->client_id, lease); | |
1029 | if (r < 0) | |
1030 | return log_dhcp_server_errno(server, r, "Could not save lease: %m"); | |
1031 | TAKE_PTR(lease); | |
1032 | ||
1033 | if (server->callback) | |
1034 | server->callback(server, SD_DHCP_SERVER_EVENT_LEASE_CHANGED, server->callback_userdata); | |
1035 | ||
1036 | return DHCP_ACK; | |
1037 | ||
1038 | } else if (pool_offset >= 0 && server->bound_leases[pool_offset] == existing_lease) { | |
1039 | _cleanup_(dhcp_lease_freep) DHCPLease *new_lease = NULL; | |
1040 | usec_t time_now, expiration; | |
1041 | DHCPLease *lease; | |
1042 | ||
1043 | r = sd_event_now(server->event, clock_boottime_or_monotonic(), &time_now); | |
1044 | if (r < 0) | |
2dead812 | 1045 | return r; |
87322b3a | 1046 | |
65a0ef23 | 1047 | expiration = usec_add(req->lifetime * USEC_PER_SEC, time_now); |
87322b3a | 1048 | |
65a0ef23 | 1049 | if (!existing_lease) { |
1050 | r = prepare_new_lease(&new_lease, address, &req->client_id, | |
1051 | req->message->chaddr, req->message->giaddr, expiration); | |
1052 | if (r < 0) | |
1053 | return r; | |
36d35f22 | 1054 | |
65a0ef23 | 1055 | lease = new_lease; |
1056 | } else { | |
1057 | existing_lease->expiration = expiration; | |
1058 | lease = existing_lease; | |
2dead812 | 1059 | } |
6e741541 | 1060 | |
65a0ef23 | 1061 | r = server_send_offer_or_ack(server, req, address, DHCP_ACK); |
1062 | if (r < 0) | |
1063 | /* this only fails on critical errors */ | |
1064 | return log_dhcp_server_errno(server, r, "Could not send ack: %m"); | |
1065 | ||
1066 | log_dhcp_server(server, "ACK (0x%x)", be32toh(req->message->xid)); | |
1067 | ||
1068 | server->bound_leases[pool_offset] = lease; | |
1069 | r = hashmap_put(server->leases_by_client_id, &lease->client_id, lease); | |
1070 | if (r < 0) | |
1071 | return log_dhcp_server_errno(server, r, "Could not save lease: %m"); | |
1072 | TAKE_PTR(new_lease); | |
1073 | ||
1074 | if (server->callback) | |
1075 | server->callback(server, SD_DHCP_SERVER_EVENT_LEASE_CHANGED, server->callback_userdata); | |
1076 | ||
1077 | return DHCP_ACK; | |
1078 | ||
bd57b450 TG |
1079 | } else if (init_reboot) { |
1080 | r = server_send_nak(server, req); | |
6e741541 | 1081 | if (r < 0) |
bd57b450 | 1082 | /* this only fails on critical errors */ |
6e741541 LP |
1083 | return log_dhcp_server_errno(server, r, "Could not send nak: %m"); |
1084 | ||
1085 | log_dhcp_server(server, "NAK (0x%x)", be32toh(req->message->xid)); | |
1086 | return DHCP_NAK; | |
bd57b450 | 1087 | } |
2dead812 TG |
1088 | |
1089 | break; | |
1090 | } | |
9a0f246f | 1091 | |
500792d8 TG |
1092 | case DHCP_RELEASE: { |
1093 | int pool_offset; | |
1094 | ||
1095 | log_dhcp_server(server, "RELEASE (0x%x)", | |
1096 | be32toh(req->message->xid)); | |
1097 | ||
1098 | if (!existing_lease) | |
1099 | return 0; | |
1100 | ||
1101 | if (existing_lease->address != req->message->ciaddr) | |
1102 | return 0; | |
1103 | ||
1104 | pool_offset = get_pool_offset(server, req->message->ciaddr); | |
1105 | if (pool_offset < 0) | |
1106 | return 0; | |
1107 | ||
1108 | if (server->bound_leases[pool_offset] == existing_lease) { | |
1109 | server->bound_leases[pool_offset] = NULL; | |
1110 | hashmap_remove(server->leases_by_client_id, existing_lease); | |
1111 | dhcp_lease_free(existing_lease); | |
36d35f22 MAL |
1112 | |
1113 | if (server->callback) | |
1114 | server->callback(server, SD_DHCP_SERVER_EVENT_LEASE_CHANGED, server->callback_userdata); | |
c3922c0c | 1115 | } |
500792d8 | 1116 | |
c3922c0c LP |
1117 | return 0; |
1118 | }} | |
4dc35568 TG |
1119 | |
1120 | return 0; | |
be077570 TG |
1121 | } |
1122 | ||
11c38d3e YA |
1123 | static size_t relay_agent_information_length(const char* agent_circuit_id, const char* agent_remote_id) { |
1124 | size_t sum = 0; | |
1125 | if (agent_circuit_id) | |
1126 | sum += 2 + strlen(agent_circuit_id); | |
1127 | if (agent_remote_id) | |
1128 | sum += 2 + strlen(agent_remote_id); | |
1129 | return sum; | |
1130 | } | |
1131 | ||
ff734080 TG |
1132 | static int server_receive_message(sd_event_source *s, int fd, |
1133 | uint32_t revents, void *userdata) { | |
be077570 | 1134 | _cleanup_free_ DHCPMessage *message = NULL; |
fb29cdbe | 1135 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in_pktinfo))) control; |
ff734080 TG |
1136 | sd_dhcp_server *server = userdata; |
1137 | struct iovec iov = {}; | |
1138 | struct msghdr msg = { | |
1139 | .msg_iov = &iov, | |
1140 | .msg_iovlen = 1, | |
fb29cdbe LP |
1141 | .msg_control = &control, |
1142 | .msg_controllen = sizeof(control), | |
ff734080 | 1143 | }; |
3a864fe4 | 1144 | struct cmsghdr *cmsg; |
11c38d3e | 1145 | ssize_t datagram_size, len; |
57027d03 | 1146 | int r; |
ff734080 TG |
1147 | |
1148 | assert(server); | |
1149 | ||
11c38d3e YA |
1150 | datagram_size = next_datagram_size_fd(fd); |
1151 | if (datagram_size < 0) | |
1152 | return datagram_size; | |
1153 | ||
1154 | size_t buflen = datagram_size; | |
1155 | if (sd_dhcp_server_is_in_relay_mode(server)) | |
19cc6d5e | 1156 | /* Preallocate the additional size for DHCP Relay Agent Information Option if needed */ |
11c38d3e | 1157 | buflen += relay_agent_information_length(server->agent_circuit_id, server->agent_remote_id) + 2; |
ff734080 | 1158 | |
0d43d2fc | 1159 | message = malloc(buflen); |
ff734080 TG |
1160 | if (!message) |
1161 | return -ENOMEM; | |
1162 | ||
11c38d3e | 1163 | iov = IOVEC_MAKE(message, datagram_size); |
ff734080 | 1164 | |
2efa5bc6 LP |
1165 | len = recvmsg_safe(fd, &msg, 0); |
1166 | if (IN_SET(len, -EAGAIN, -EINTR)) | |
1167 | return 0; | |
1168 | if (len < 0) | |
1169 | return len; | |
1170 | if ((size_t) len < sizeof(DHCPMessage)) | |
be077570 | 1171 | return 0; |
ff734080 | 1172 | |
2a1288ff | 1173 | CMSG_FOREACH(cmsg, &msg) { |
3a864fe4 TG |
1174 | if (cmsg->cmsg_level == IPPROTO_IP && |
1175 | cmsg->cmsg_type == IP_PKTINFO && | |
1176 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) { | |
1177 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg); | |
1178 | ||
a6f1e036 TG |
1179 | /* TODO figure out if this can be done as a filter on |
1180 | * the socket, like for IPv6 */ | |
b3ec603c | 1181 | if (server->ifindex != info->ipi_ifindex) |
3a864fe4 TG |
1182 | return 0; |
1183 | ||
1184 | break; | |
1185 | } | |
1186 | } | |
1187 | ||
c95df587 | 1188 | if (sd_dhcp_server_is_in_relay_mode(server)) { |
11c38d3e | 1189 | r = dhcp_server_relay_message(server, message, len - sizeof(DHCPMessage), buflen); |
c95df587 YA |
1190 | if (r < 0) |
1191 | log_dhcp_server_errno(server, r, "Couldn't relay message: %m"); | |
1192 | } else { | |
1193 | r = dhcp_server_handle_message(server, message, (size_t) len); | |
1194 | if (r < 0) | |
1195 | log_dhcp_server_errno(server, r, "Couldn't process incoming message: %m"); | |
1196 | } | |
57027d03 | 1197 | return 0; |
ff734080 TG |
1198 | } |
1199 | ||
1200 | int sd_dhcp_server_start(sd_dhcp_server *server) { | |
1201 | int r; | |
1202 | ||
1203 | assert_return(server, -EINVAL); | |
1204 | assert_return(server->event, -EINVAL); | |
1205 | assert_return(!server->receive_message, -EBUSY); | |
cfcbb135 LP |
1206 | assert_return(server->fd_raw < 0, -EBUSY); |
1207 | assert_return(server->fd < 0, -EBUSY); | |
20af7091 | 1208 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH); |
ff734080 | 1209 | |
3e29b889 | 1210 | r = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0); |
8de4a226 TG |
1211 | if (r < 0) { |
1212 | r = -errno; | |
21b6b87e | 1213 | goto on_error; |
8de4a226 TG |
1214 | } |
1215 | server->fd_raw = r; | |
1216 | ||
21b6b87e YA |
1217 | if (server->bind_to_interface) |
1218 | r = dhcp_network_bind_udp_socket(server->ifindex, INADDR_ANY, DHCP_PORT_SERVER, -1); | |
1219 | else | |
1220 | r = dhcp_network_bind_udp_socket(0, server->address, DHCP_PORT_SERVER, -1); | |
1221 | if (r < 0) | |
1222 | goto on_error; | |
ff734080 TG |
1223 | server->fd = r; |
1224 | ||
1225 | r = sd_event_add_io(server->event, &server->receive_message, | |
1226 | server->fd, EPOLLIN, | |
1227 | server_receive_message, server); | |
21b6b87e YA |
1228 | if (r < 0) |
1229 | goto on_error; | |
ff734080 TG |
1230 | |
1231 | r = sd_event_source_set_priority(server->receive_message, | |
1232 | server->event_priority); | |
21b6b87e YA |
1233 | if (r < 0) |
1234 | goto on_error; | |
1235 | ||
1236 | if (!server->bind_to_interface) { | |
1237 | r = dhcp_network_bind_udp_socket(server->ifindex, INADDR_BROADCAST, DHCP_PORT_SERVER, -1); | |
1238 | if (r < 0) | |
1239 | goto on_error; | |
1240 | ||
1241 | server->fd_broadcast = r; | |
1242 | ||
1243 | r = sd_event_add_io(server->event, &server->receive_broadcast, | |
1244 | server->fd_broadcast, EPOLLIN, | |
1245 | server_receive_message, server); | |
1246 | if (r < 0) | |
1247 | goto on_error; | |
1248 | ||
1249 | r = sd_event_source_set_priority(server->receive_broadcast, | |
1250 | server->event_priority); | |
1251 | if (r < 0) | |
1252 | goto on_error; | |
ff734080 TG |
1253 | } |
1254 | ||
1255 | log_dhcp_server(server, "STARTED"); | |
1256 | ||
1257 | return 0; | |
21b6b87e YA |
1258 | |
1259 | on_error: | |
1260 | sd_dhcp_server_stop(server); | |
1261 | return r; | |
ff734080 | 1262 | } |
52750344 TG |
1263 | |
1264 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { | |
621ac3d2 | 1265 | int r = 0; |
52750344 TG |
1266 | |
1267 | assert_return(server, -EINVAL); | |
1268 | assert(server->bound_leases); | |
1269 | ||
fe96c0f8 | 1270 | for (uint32_t i = 0; i < server->pool_size; i++) { |
52750344 TG |
1271 | DHCPLease *lease = server->bound_leases[i]; |
1272 | ||
99634696 | 1273 | if (!lease || lease == &server->invalid_lease) |
52750344 TG |
1274 | continue; |
1275 | ||
1276 | r = server_send_forcerenew(server, lease->address, | |
1277 | lease->gateway, | |
1278 | lease->chaddr); | |
1279 | if (r < 0) | |
1280 | return r; | |
6408ba5f LP |
1281 | |
1282 | log_dhcp_server(server, "FORCERENEW"); | |
52750344 TG |
1283 | } |
1284 | ||
1285 | return r; | |
1286 | } | |
8eb9058d | 1287 | |
21b6b87e YA |
1288 | int sd_dhcp_server_set_bind_to_interface(sd_dhcp_server *server, int enabled) { |
1289 | assert_return(server, -EINVAL); | |
1290 | assert_return(!sd_dhcp_server_is_running(server), -EBUSY); | |
1291 | ||
1292 | if (!!enabled == server->bind_to_interface) | |
1293 | return 0; | |
1294 | ||
1295 | server->bind_to_interface = enabled; | |
1296 | ||
1297 | return 1; | |
1298 | } | |
1299 | ||
64d6c229 | 1300 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { |
8eb9058d LP |
1301 | int r; |
1302 | ||
1303 | assert_return(server, -EINVAL); | |
089fb865 | 1304 | assert_return(timezone_is_valid(tz, LOG_DEBUG), -EINVAL); |
8eb9058d | 1305 | |
64d6c229 | 1306 | if (streq_ptr(tz, server->timezone)) |
8eb9058d LP |
1307 | return 0; |
1308 | ||
64d6c229 | 1309 | r = free_and_strdup(&server->timezone, tz); |
8eb9058d LP |
1310 | if (r < 0) |
1311 | return r; | |
1312 | ||
1313 | return 1; | |
1314 | } | |
586ac6f7 LP |
1315 | |
1316 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1317 | assert_return(server, -EINVAL); | |
1318 | ||
1319 | if (t == server->max_lease_time) | |
1320 | return 0; | |
1321 | ||
1322 | server->max_lease_time = t; | |
1323 | return 1; | |
1324 | } | |
1325 | ||
1326 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1327 | assert_return(server, -EINVAL); | |
1328 | ||
1329 | if (t == server->default_lease_time) | |
1330 | return 0; | |
1331 | ||
1332 | server->default_lease_time = t; | |
1333 | return 1; | |
1334 | } | |
1a04db0f | 1335 | |
c8407baf ZJS |
1336 | int sd_dhcp_server_set_servers( |
1337 | sd_dhcp_server *server, | |
2324fd3a | 1338 | sd_dhcp_lease_server_type_t what, |
c8407baf | 1339 | const struct in_addr addresses[], |
90810f7a | 1340 | size_t n_addresses) { |
1a04db0f | 1341 | |
ddb82ec2 LP |
1342 | struct in_addr *c = NULL; |
1343 | ||
1a04db0f | 1344 | assert_return(server, -EINVAL); |
c8407baf | 1345 | assert_return(addresses || n_addresses == 0, -EINVAL); |
ddb82ec2 LP |
1346 | assert_return(what >= 0, -EINVAL); |
1347 | assert_return(what < _SD_DHCP_LEASE_SERVER_TYPE_MAX, -EINVAL); | |
1a04db0f | 1348 | |
ddb82ec2 LP |
1349 | if (server->servers[what].size == n_addresses && |
1350 | memcmp(server->servers[what].addr, addresses, sizeof(struct in_addr) * n_addresses) == 0) | |
f678ac7e SS |
1351 | return 0; |
1352 | ||
c8407baf ZJS |
1353 | if (n_addresses > 0) { |
1354 | c = newdup(struct in_addr, addresses, n_addresses); | |
f678ac7e SS |
1355 | if (!c) |
1356 | return -ENOMEM; | |
f678ac7e SS |
1357 | } |
1358 | ||
ddb82ec2 LP |
1359 | free(server->servers[what].addr); |
1360 | server->servers[what].addr = c; | |
1361 | server->servers[what].size = n_addresses; | |
f678ac7e SS |
1362 | return 1; |
1363 | } | |
1364 | ||
90810f7a | 1365 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], size_t n) { |
ddb82ec2 | 1366 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_DNS, dns, n); |
c8407baf | 1367 | } |
90810f7a | 1368 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], size_t n) { |
ddb82ec2 | 1369 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_NTP, ntp, n); |
c8407baf | 1370 | } |
90810f7a | 1371 | int sd_dhcp_server_set_sip(sd_dhcp_server *server, const struct in_addr sip[], size_t n) { |
ddb82ec2 | 1372 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_SIP, sip, n); |
c8407baf | 1373 | } |
90810f7a | 1374 | int sd_dhcp_server_set_pop3(sd_dhcp_server *server, const struct in_addr pop3[], size_t n) { |
ddb82ec2 | 1375 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_POP3, pop3, n); |
c8407baf | 1376 | } |
90810f7a | 1377 | int sd_dhcp_server_set_smtp(sd_dhcp_server *server, const struct in_addr smtp[], size_t n) { |
ddb82ec2 | 1378 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_SMTP, smtp, n); |
2c649ca1 | 1379 | } |
90810f7a | 1380 | int sd_dhcp_server_set_lpr(sd_dhcp_server *server, const struct in_addr lpr[], size_t n) { |
ddb82ec2 | 1381 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_LPR, lpr, n); |
50018bfa | 1382 | } |
2c649ca1 | 1383 | |
77ff6022 CG |
1384 | int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled) { |
1385 | assert_return(server, -EINVAL); | |
1386 | ||
1387 | if (enabled == server->emit_router) | |
1388 | return 0; | |
1389 | ||
1390 | server->emit_router = enabled; | |
1391 | ||
1392 | return 1; | |
1393 | } | |
564ca984 | 1394 | |
461dbb2f | 1395 | int sd_dhcp_server_add_option(sd_dhcp_server *server, sd_dhcp_option *v) { |
564ca984 SS |
1396 | int r; |
1397 | ||
1398 | assert_return(server, -EINVAL); | |
1399 | assert_return(v, -EINVAL); | |
1400 | ||
ebffea2a | 1401 | r = ordered_set_ensure_put(&server->extra_options, &dhcp_option_hash_ops, v); |
7354900d DW |
1402 | if (r < 0) |
1403 | return r; | |
1404 | ||
1405 | sd_dhcp_option_ref(v); | |
1406 | return 0; | |
1407 | } | |
1408 | ||
1409 | int sd_dhcp_server_add_vendor_option(sd_dhcp_server *server, sd_dhcp_option *v) { | |
1410 | int r; | |
1411 | ||
1412 | assert_return(server, -EINVAL); | |
1413 | assert_return(v, -EINVAL); | |
1414 | ||
ebffea2a | 1415 | r = ordered_set_ensure_put(&server->vendor_options, &dhcp_option_hash_ops, v); |
564ca984 SS |
1416 | if (r < 0) |
1417 | return r; | |
1418 | ||
461dbb2f | 1419 | sd_dhcp_option_ref(v); |
564ca984 SS |
1420 | |
1421 | return 1; | |
1422 | } | |
5b03043a MAL |
1423 | |
1424 | int sd_dhcp_server_set_callback(sd_dhcp_server *server, sd_dhcp_server_callback_t cb, void *userdata) { | |
1425 | assert_return(server, -EINVAL); | |
1426 | ||
1427 | server->callback = cb; | |
1428 | server->callback_userdata = userdata; | |
1429 | ||
1430 | return 0; | |
1431 | } | |
c95df587 | 1432 | |
11c38d3e | 1433 | int sd_dhcp_server_set_relay_target(sd_dhcp_server *server, const struct in_addr *address) { |
c95df587 YA |
1434 | assert_return(server, -EINVAL); |
1435 | assert_return(!sd_dhcp_server_is_running(server), -EBUSY); | |
1436 | ||
1437 | if (memcmp(address, &server->relay_target, sizeof(struct in_addr)) == 0) | |
1438 | return 0; | |
1439 | ||
1440 | server->relay_target = *address; | |
1441 | return 1; | |
1442 | } | |
11c38d3e YA |
1443 | |
1444 | int sd_dhcp_server_set_relay_agent_information( | |
1445 | sd_dhcp_server *server, | |
1446 | const char *agent_circuit_id, | |
1447 | const char *agent_remote_id) { | |
1448 | _cleanup_free_ char *circuit_id_dup = NULL, *remote_id_dup = NULL; | |
1449 | ||
1450 | assert_return(server, -EINVAL); | |
1451 | ||
1452 | if (relay_agent_information_length(agent_circuit_id, agent_remote_id) > UINT8_MAX) | |
1453 | return -ENOBUFS; | |
1454 | ||
1455 | if (agent_circuit_id) { | |
1456 | circuit_id_dup = strdup(agent_circuit_id); | |
1457 | if (!circuit_id_dup) | |
1458 | return -ENOMEM; | |
1459 | } | |
1460 | ||
1461 | if (agent_remote_id) { | |
1462 | remote_id_dup = strdup(agent_remote_id); | |
1463 | if (!remote_id_dup) | |
1464 | return -ENOMEM; | |
1465 | } | |
1466 | ||
1467 | free_and_replace(server->agent_circuit_id, circuit_id_dup); | |
1468 | free_and_replace(server->agent_remote_id, remote_id_dup); | |
1469 | return 0; | |
1470 | } | |
65a0ef23 | 1471 | |
1472 | int sd_dhcp_server_set_static_lease( | |
1473 | sd_dhcp_server *server, | |
1474 | const struct in_addr *address, | |
1475 | uint8_t *client_id, | |
1476 | size_t client_id_size) { | |
1477 | ||
1478 | _cleanup_(dhcp_lease_freep) DHCPLease *lease = NULL, *old = NULL; | |
1479 | DHCPClientId c; | |
1480 | int r; | |
1481 | ||
1482 | assert_return(server, -EINVAL); | |
1483 | assert_return(client_id, -EINVAL); | |
1484 | assert_return(client_id_size == ETH_ALEN + 1, -EINVAL); | |
1485 | assert_return(!sd_dhcp_server_is_running(server), -EBUSY); | |
1486 | ||
1487 | /* Static lease with an empty or omitted address is a valid entry, | |
1488 | * the server removes any static lease with the specified mac address. */ | |
1489 | if (!address || address->s_addr == 0) { | |
1490 | _cleanup_free_ void *data = NULL; | |
1491 | ||
1492 | data = memdup(client_id, client_id_size); | |
1493 | if (!data) | |
1494 | return -ENOMEM; | |
1495 | ||
1496 | c = (DHCPClientId) { | |
1497 | .length = client_id_size, | |
1498 | .data = data, | |
1499 | }; | |
1500 | ||
1501 | old = hashmap_remove(server->static_leases_by_client_id, &c); | |
1502 | return 0; | |
1503 | } | |
1504 | ||
1505 | if (static_leases_have_address(server, address->s_addr)) | |
1506 | return -EEXIST; | |
1507 | ||
1508 | lease = new(DHCPLease, 1); | |
1509 | if (!lease) | |
1510 | return -ENOMEM; | |
1511 | ||
1512 | *lease = (DHCPLease) { | |
1513 | .address = address->s_addr, | |
1514 | .client_id.length = client_id_size, | |
1515 | .gateway = 0, | |
1516 | .expiration = 0, | |
1517 | }; | |
1518 | lease->client_id.data = memdup(client_id, client_id_size); | |
1519 | if (!lease->client_id.data) | |
1520 | return -ENOMEM; | |
1521 | ||
1522 | r = hashmap_ensure_put(&server->static_leases_by_client_id, &dhcp_lease_hash_ops, &lease->client_id, lease); | |
1523 | if (r < 0) | |
1524 | return r; | |
1525 | ||
1526 | TAKE_PTR(lease); | |
1527 | return 0; | |
1528 | } |