]>
Commit | Line | Data |
---|---|---|
53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b44cd882 | 2 | /*** |
810adae9 | 3 | Copyright © 2013 Intel Corporation. All rights reserved. |
b44cd882 TG |
4 | ***/ |
5 | ||
ff734080 TG |
6 | #include <sys/ioctl.h> |
7 | ||
b44cd882 | 8 | #include "sd-dhcp-server.h" |
6e86b24d | 9 | #include "sd-id128.h" |
07630cea | 10 | |
b5efdb8a | 11 | #include "alloc-util.h" |
ff734080 | 12 | #include "dhcp-internal.h" |
07630cea | 13 | #include "dhcp-server-internal.h" |
3ffd4af2 | 14 | #include "fd-util.h" |
07630cea | 15 | #include "in-addr-util.h" |
cb310866 | 16 | #include "io-util.h" |
07630cea LP |
17 | #include "siphash24.h" |
18 | #include "string-util.h" | |
9ae84244 | 19 | #include "unaligned.h" |
b44cd882 | 20 | |
586ac6f7 LP |
21 | #define DHCP_DEFAULT_LEASE_TIME_USEC USEC_PER_HOUR |
22 | #define DHCP_MAX_LEASE_TIME_USEC (USEC_PER_HOUR*12) | |
4dc35568 | 23 | |
6121fc30 | 24 | static DHCPLease *dhcp_lease_free(DHCPLease *lease) { |
45a9eac9 | 25 | if (!lease) |
6121fc30 | 26 | return NULL; |
45a9eac9 RM |
27 | |
28 | free(lease->client_id.data); | |
6121fc30 | 29 | return mfree(lease); |
45a9eac9 RM |
30 | } |
31 | ||
99634696 TG |
32 | /* configures the server's address and subnet, and optionally the pool's size and offset into the subnet |
33 | * the whole pool must fit into the subnet, and may not contain the first (any) nor last (broadcast) address | |
34 | * moreover, the server's own address may be in the pool, and is in that case reserved in order not to | |
35 | * accidentally hand it out */ | |
36 | int sd_dhcp_server_configure_pool(sd_dhcp_server *server, struct in_addr *address, unsigned char prefixlen, uint32_t offset, uint32_t size) { | |
37 | struct in_addr netmask_addr; | |
38 | be32_t netmask; | |
39 | uint32_t server_off, broadcast_off, size_max; | |
40 | ||
2dead812 TG |
41 | assert_return(server, -EINVAL); |
42 | assert_return(address, -EINVAL); | |
99634696 TG |
43 | assert_return(address->s_addr != INADDR_ANY, -EINVAL); |
44 | assert_return(prefixlen <= 32, -ERANGE); | |
99634696 | 45 | |
5a941f5f | 46 | assert_se(in4_addr_prefixlen_to_netmask(&netmask_addr, prefixlen)); |
99634696 TG |
47 | netmask = netmask_addr.s_addr; |
48 | ||
49 | server_off = be32toh(address->s_addr & ~netmask); | |
50 | broadcast_off = be32toh(~netmask); | |
51 | ||
52 | /* the server address cannot be the subnet address */ | |
53 | assert_return(server_off != 0, -ERANGE); | |
54 | ||
55 | /* nor the broadcast address */ | |
56 | assert_return(server_off != broadcast_off, -ERANGE); | |
57 | ||
58 | /* 0 offset means we should set a default, we skip the first (subnet) address | |
59 | and take the next one */ | |
60 | if (offset == 0) | |
61 | offset = 1; | |
62 | ||
63 | size_max = (broadcast_off + 1) /* the number of addresses in the subnet */ | |
64 | - offset /* exclude the addresses before the offset */ | |
65 | - 1; /* exclude the last (broadcast) address */ | |
66 | ||
67 | /* The pool must contain at least one address */ | |
68 | assert_return(size_max >= 1, -ERANGE); | |
69 | ||
70 | if (size != 0) | |
71 | assert_return(size <= size_max, -ERANGE); | |
72 | else | |
73 | size = size_max; | |
87322b3a | 74 | |
45a9eac9 | 75 | if (server->address != address->s_addr || server->netmask != netmask || server->pool_size != size || server->pool_offset != offset) { |
45a9eac9 RM |
76 | |
77 | free(server->bound_leases); | |
78 | server->bound_leases = new0(DHCPLease*, size); | |
79 | if (!server->bound_leases) | |
80 | return -ENOMEM; | |
2dead812 | 81 | |
45a9eac9 RM |
82 | server->pool_offset = offset; |
83 | server->pool_size = size; | |
2dead812 | 84 | |
45a9eac9 RM |
85 | server->address = address->s_addr; |
86 | server->netmask = netmask; | |
87 | server->subnet = address->s_addr & netmask; | |
99634696 | 88 | |
45a9eac9 RM |
89 | if (server_off >= offset && server_off - offset < size) |
90 | server->bound_leases[server_off - offset] = &server->invalid_lease; | |
91 | ||
92 | /* Drop any leases associated with the old address range */ | |
6121fc30 | 93 | hashmap_clear(server->leases_by_client_id); |
45a9eac9 | 94 | } |
20af7091 TG |
95 | |
96 | return 0; | |
97 | } | |
98 | ||
04c01369 | 99 | int sd_dhcp_server_is_running(sd_dhcp_server *server) { |
75677581 | 100 | assert_return(server, false); |
7c16313f TG |
101 | |
102 | return !!server->receive_message; | |
103 | } | |
104 | ||
7a08d314 | 105 | void client_id_hash_func(const DHCPClientId *id, struct siphash *state) { |
87322b3a TG |
106 | assert(id); |
107 | assert(id->length); | |
108 | assert(id->data); | |
109 | ||
1e2527a6 | 110 | siphash24_compress(&id->length, sizeof(id->length), state); |
b826ab58 | 111 | siphash24_compress(id->data, id->length, state); |
87322b3a TG |
112 | } |
113 | ||
7a08d314 | 114 | int client_id_compare_func(const DHCPClientId *a, const DHCPClientId *b) { |
a0edd02e | 115 | int r; |
87322b3a | 116 | |
87322b3a TG |
117 | assert(!a->length || a->data); |
118 | assert(!b->length || b->data); | |
119 | ||
a0edd02e FB |
120 | r = CMP(a->length, b->length); |
121 | if (r != 0) | |
122 | return r; | |
87322b3a TG |
123 | |
124 | return memcmp(a->data, b->data, a->length); | |
125 | } | |
126 | ||
6121fc30 YW |
127 | DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(dhcp_lease_hash_ops, DHCPClientId, client_id_hash_func, client_id_compare_func, |
128 | DHCPLease, dhcp_lease_free); | |
d5099efc | 129 | |
8301aa0b | 130 | static sd_dhcp_server *dhcp_server_free(sd_dhcp_server *server) { |
8301aa0b | 131 | assert(server); |
ff734080 | 132 | |
3bdace9b | 133 | log_dhcp_server(server, "UNREF"); |
87322b3a | 134 | |
3bdace9b | 135 | sd_dhcp_server_stop(server); |
87322b3a | 136 | |
3bdace9b LP |
137 | sd_event_unref(server->event); |
138 | ||
8eb9058d | 139 | free(server->timezone); |
1a04db0f LP |
140 | free(server->dns); |
141 | free(server->ntp); | |
299d578f | 142 | free(server->sip); |
8eb9058d | 143 | |
3bdace9b LP |
144 | hashmap_free(server->leases_by_client_id); |
145 | ||
7354900d DW |
146 | ordered_hashmap_free(server->extra_options); |
147 | ordered_hashmap_free(server->vendor_options); | |
564ca984 | 148 | |
3bdace9b | 149 | free(server->bound_leases); |
6b430fdb | 150 | return mfree(server); |
b44cd882 TG |
151 | } |
152 | ||
8301aa0b YW |
153 | DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_server, sd_dhcp_server, dhcp_server_free); |
154 | ||
3a864fe4 | 155 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
4afd3348 | 156 | _cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL; |
b44cd882 TG |
157 | |
158 | assert_return(ret, -EINVAL); | |
3a864fe4 | 159 | assert_return(ifindex > 0, -EINVAL); |
b44cd882 TG |
160 | |
161 | server = new0(sd_dhcp_server, 1); | |
162 | if (!server) | |
163 | return -ENOMEM; | |
164 | ||
3733eec3 | 165 | server->n_ref = 1; |
8de4a226 | 166 | server->fd_raw = -1; |
ff734080 | 167 | server->fd = -1; |
20af7091 | 168 | server->address = htobe32(INADDR_ANY); |
59b8f6b6 | 169 | server->netmask = htobe32(INADDR_ANY); |
b3ec603c | 170 | server->ifindex = ifindex; |
357e1b17 | 171 | |
6121fc30 | 172 | server->leases_by_client_id = hashmap_new(&dhcp_lease_hash_ops); |
357e1b17 LP |
173 | if (!server->leases_by_client_id) |
174 | return -ENOMEM; | |
175 | ||
586ac6f7 LP |
176 | server->default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC); |
177 | server->max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC); | |
b44cd882 | 178 | |
1cc6c93a | 179 | *ret = TAKE_PTR(server); |
b44cd882 TG |
180 | |
181 | return 0; | |
182 | } | |
183 | ||
32d20645 | 184 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int64_t priority) { |
b44cd882 TG |
185 | int r; |
186 | ||
187 | assert_return(server, -EINVAL); | |
188 | assert_return(!server->event, -EBUSY); | |
189 | ||
190 | if (event) | |
191 | server->event = sd_event_ref(event); | |
192 | else { | |
193 | r = sd_event_default(&server->event); | |
194 | if (r < 0) | |
195 | return r; | |
196 | } | |
197 | ||
198 | server->event_priority = priority; | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
204 | assert_return(server, -EINVAL); | |
205 | ||
206 | server->event = sd_event_unref(server->event); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
212 | assert_return(server, NULL); | |
213 | ||
214 | return server->event; | |
215 | } | |
ff734080 TG |
216 | |
217 | int sd_dhcp_server_stop(sd_dhcp_server *server) { | |
218 | assert_return(server, -EINVAL); | |
219 | ||
220 | server->receive_message = | |
221 | sd_event_source_unref(server->receive_message); | |
222 | ||
8de4a226 | 223 | server->fd_raw = safe_close(server->fd_raw); |
ff734080 TG |
224 | server->fd = safe_close(server->fd); |
225 | ||
226 | log_dhcp_server(server, "STOPPED"); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
a6f1e036 TG |
231 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
232 | DHCPPacket *packet, size_t len) { | |
969b009d TG |
233 | union sockaddr_union link = { |
234 | .ll.sll_family = AF_PACKET, | |
8e38570e | 235 | .ll.sll_protocol = htobe16(ETH_P_IP), |
b3ec603c | 236 | .ll.sll_ifindex = server->ifindex, |
969b009d TG |
237 | .ll.sll_halen = ETH_ALEN, |
238 | }; | |
969b009d TG |
239 | |
240 | assert(server); | |
b3ec603c | 241 | assert(server->ifindex > 0); |
969b009d TG |
242 | assert(server->address); |
243 | assert(packet); | |
244 | assert(len > sizeof(DHCPPacket)); | |
245 | ||
246 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN); | |
247 | ||
248 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, | |
a6f1e036 | 249 | packet->dhcp.yiaddr, |
afe42aef | 250 | DHCP_PORT_CLIENT, len, -1); |
969b009d | 251 | |
b3ec603c | 252 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
969b009d TG |
253 | } |
254 | ||
255 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
8eb7b6a5 | 256 | uint16_t destination_port, |
969b009d TG |
257 | DHCPMessage *message, size_t len) { |
258 | union sockaddr_union dest = { | |
259 | .in.sin_family = AF_INET, | |
8eb7b6a5 | 260 | .in.sin_port = htobe16(destination_port), |
969b009d TG |
261 | .in.sin_addr.s_addr = destination, |
262 | }; | |
263 | struct iovec iov = { | |
264 | .iov_base = message, | |
265 | .iov_len = len, | |
266 | }; | |
267 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))] = {}; | |
268 | struct msghdr msg = { | |
269 | .msg_name = &dest, | |
270 | .msg_namelen = sizeof(dest.in), | |
271 | .msg_iov = &iov, | |
272 | .msg_iovlen = 1, | |
273 | .msg_control = cmsgbuf, | |
274 | .msg_controllen = sizeof(cmsgbuf), | |
275 | }; | |
276 | struct cmsghdr *cmsg; | |
277 | struct in_pktinfo *pktinfo; | |
969b009d TG |
278 | |
279 | assert(server); | |
4c9cb12c | 280 | assert(server->fd >= 0); |
969b009d TG |
281 | assert(message); |
282 | assert(len > sizeof(DHCPMessage)); | |
283 | ||
284 | cmsg = CMSG_FIRSTHDR(&msg); | |
285 | assert(cmsg); | |
286 | ||
287 | cmsg->cmsg_level = IPPROTO_IP; | |
288 | cmsg->cmsg_type = IP_PKTINFO; | |
289 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
290 | ||
291 | /* we attach source interface and address info to the message | |
292 | rather than binding the socket. This will be mostly useful | |
293 | when we gain support for arbitrary number of server addresses | |
294 | */ | |
295 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
296 | assert(pktinfo); | |
297 | ||
b3ec603c | 298 | pktinfo->ipi_ifindex = server->ifindex; |
969b009d TG |
299 | pktinfo->ipi_spec_dst.s_addr = server->address; |
300 | ||
0f01c1f9 | 301 | if (sendmsg(server->fd, &msg, 0) < 0) |
969b009d TG |
302 | return -errno; |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
307 | static bool requested_broadcast(DHCPRequest *req) { | |
308 | assert(req); | |
309 | ||
310 | return req->message->flags & htobe16(0x8000); | |
311 | } | |
312 | ||
313 | int dhcp_server_send_packet(sd_dhcp_server *server, | |
314 | DHCPRequest *req, DHCPPacket *packet, | |
315 | int type, size_t optoffset) { | |
316 | be32_t destination = INADDR_ANY; | |
8eb7b6a5 | 317 | uint16_t destination_port = DHCP_PORT_CLIENT; |
969b009d TG |
318 | int r; |
319 | ||
320 | assert(server); | |
321 | assert(req); | |
322 | assert(req->max_optlen); | |
323 | assert(optoffset <= req->max_optlen); | |
324 | assert(packet); | |
325 | ||
326 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 327 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
969b009d TG |
328 | 4, &server->address); |
329 | if (r < 0) | |
330 | return r; | |
331 | ||
332 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 333 | SD_DHCP_OPTION_END, 0, NULL); |
969b009d TG |
334 | if (r < 0) |
335 | return r; | |
336 | ||
337 | /* RFC 2131 Section 4.1 | |
338 | ||
339 | If the ’giaddr’ field in a DHCP message from a client is non-zero, | |
340 | the server sends any return messages to the ’DHCP server’ port on the | |
341 | BOOTP relay agent whose address appears in ’giaddr’. If the ’giaddr’ | |
342 | field is zero and the ’ciaddr’ field is nonzero, then the server | |
343 | unicasts DHCPOFFER and DHCPACK messages to the address in ’ciaddr’. | |
344 | If ’giaddr’ is zero and ’ciaddr’ is zero, and the broadcast bit is | |
345 | set, then the server broadcasts DHCPOFFER and DHCPACK messages to | |
346 | 0xffffffff. If the broadcast bit is not set and ’giaddr’ is zero and | |
347 | ’ciaddr’ is zero, then the server unicasts DHCPOFFER and DHCPACK | |
348 | messages to the client’s hardware address and ’yiaddr’ address. In | |
349 | all cases, when ’giaddr’ is zero, the server broadcasts any DHCPNAK | |
350 | messages to 0xffffffff. | |
351 | ||
352 | Section 4.3.2 | |
353 | ||
354 | If ’giaddr’ is set in the DHCPREQUEST message, the client is on a | |
355 | different subnet. The server MUST set the broadcast bit in the | |
356 | DHCPNAK, so that the relay agent will broadcast the DHCPNAK to the | |
357 | client, because the client may not have a correct network address | |
358 | or subnet mask, and the client may not be answering ARP requests. | |
359 | */ | |
360 | if (req->message->giaddr) { | |
361 | destination = req->message->giaddr; | |
8eb7b6a5 | 362 | destination_port = DHCP_PORT_SERVER; |
969b009d TG |
363 | if (type == DHCP_NAK) |
364 | packet->dhcp.flags = htobe16(0x8000); | |
365 | } else if (req->message->ciaddr && type != DHCP_NAK) | |
366 | destination = req->message->ciaddr; | |
367 | ||
d6bd972d | 368 | if (destination != INADDR_ANY) |
8eb7b6a5 PF |
369 | return dhcp_server_send_udp(server, destination, |
370 | destination_port, &packet->dhcp, | |
969b009d | 371 | sizeof(DHCPMessage) + optoffset); |
d6bd972d | 372 | else if (requested_broadcast(req) || type == DHCP_NAK) |
a6f1e036 | 373 | return dhcp_server_send_udp(server, INADDR_BROADCAST, |
8eb7b6a5 | 374 | destination_port, &packet->dhcp, |
d6bd972d | 375 | sizeof(DHCPMessage) + optoffset); |
969b009d | 376 | else |
a6f1e036 TG |
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 */ | |
969b009d TG |
380 | return dhcp_server_send_unicast_raw(server, packet, |
381 | sizeof(DHCPPacket) + optoffset); | |
382 | } | |
383 | ||
4dc35568 | 384 | static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret, |
a6f1e036 TG |
385 | uint8_t type, size_t *_optoffset, |
386 | DHCPRequest *req) { | |
4dc35568 | 387 | _cleanup_free_ DHCPPacket *packet = NULL; |
1231c4d2 | 388 | size_t optoffset = 0; |
4dc35568 TG |
389 | int r; |
390 | ||
391 | assert(server); | |
392 | assert(ret); | |
393 | assert(_optoffset); | |
bd57b450 | 394 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)); |
4dc35568 TG |
395 | |
396 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen); | |
397 | if (!packet) | |
398 | return -ENOMEM; | |
399 | ||
a6f1e036 | 400 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
76253e73 DW |
401 | be32toh(req->message->xid), type, ARPHRD_ETHER, |
402 | req->max_optlen, &optoffset); | |
4dc35568 TG |
403 | if (r < 0) |
404 | return r; | |
405 | ||
406 | packet->dhcp.flags = req->message->flags; | |
407 | packet->dhcp.giaddr = req->message->giaddr; | |
408 | memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN); | |
409 | ||
410 | *_optoffset = optoffset; | |
1cc6c93a | 411 | *ret = TAKE_PTR(packet); |
4dc35568 TG |
412 | |
413 | return 0; | |
414 | } | |
415 | ||
a6f1e036 TG |
416 | static int server_send_offer(sd_dhcp_server *server, DHCPRequest *req, |
417 | be32_t address) { | |
4dc35568 TG |
418 | _cleanup_free_ DHCPPacket *packet = NULL; |
419 | size_t offset; | |
420 | be32_t lease_time; | |
421 | int r; | |
422 | ||
423 | r = server_message_init(server, &packet, DHCP_OFFER, &offset, req); | |
424 | if (r < 0) | |
425 | return r; | |
426 | ||
2dead812 | 427 | packet->dhcp.yiaddr = address; |
4dc35568 | 428 | |
c7d9ffe6 | 429 | lease_time = htobe32(req->lifetime); |
4dc35568 | 430 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 431 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 432 | &lease_time); |
4dc35568 TG |
433 | if (r < 0) |
434 | return r; | |
435 | ||
59b8f6b6 | 436 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 437 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
438 | if (r < 0) |
439 | return r; | |
440 | ||
77ff6022 CG |
441 | if (server->emit_router) { |
442 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
443 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
444 | if (r < 0) | |
445 | return r; | |
446 | } | |
59b8f6b6 | 447 | |
4dc35568 TG |
448 | r = dhcp_server_send_packet(server, req, packet, DHCP_OFFER, offset); |
449 | if (r < 0) | |
450 | return r; | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
a6f1e036 TG |
455 | static int server_send_ack(sd_dhcp_server *server, DHCPRequest *req, |
456 | be32_t address) { | |
2dead812 | 457 | _cleanup_free_ DHCPPacket *packet = NULL; |
2dead812 | 458 | be32_t lease_time; |
7354900d DW |
459 | sd_dhcp_option *j; |
460 | Iterator i; | |
564ca984 | 461 | size_t offset; |
2dead812 TG |
462 | int r; |
463 | ||
464 | r = server_message_init(server, &packet, DHCP_ACK, &offset, req); | |
465 | if (r < 0) | |
466 | return r; | |
467 | ||
468 | packet->dhcp.yiaddr = address; | |
469 | ||
c7d9ffe6 | 470 | lease_time = htobe32(req->lifetime); |
2dead812 | 471 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 472 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 473 | &lease_time); |
2dead812 TG |
474 | if (r < 0) |
475 | return r; | |
476 | ||
59b8f6b6 | 477 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 478 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
479 | if (r < 0) |
480 | return r; | |
481 | ||
77ff6022 CG |
482 | if (server->emit_router) { |
483 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
484 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
485 | if (r < 0) | |
486 | return r; | |
487 | } | |
59b8f6b6 | 488 | |
1a04db0f LP |
489 | if (server->n_dns > 0) { |
490 | r = dhcp_option_append( | |
491 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 492 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, |
1a04db0f LP |
493 | sizeof(struct in_addr) * server->n_dns, server->dns); |
494 | if (r < 0) | |
495 | return r; | |
496 | } | |
497 | ||
498 | if (server->n_ntp > 0) { | |
499 | r = dhcp_option_append( | |
500 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 501 | SD_DHCP_OPTION_NTP_SERVER, |
1a04db0f LP |
502 | sizeof(struct in_addr) * server->n_ntp, server->ntp); |
503 | if (r < 0) | |
504 | return r; | |
505 | } | |
506 | ||
299d578f SS |
507 | if (server->n_sip > 0) { |
508 | r = dhcp_option_append( | |
509 | &packet->dhcp, req->max_optlen, &offset, 0, | |
510 | SD_DHCP_OPTION_SIP_SERVER, | |
511 | sizeof(struct in_addr) * server->n_sip, server->sip); | |
512 | if (r < 0) | |
513 | return r; | |
514 | } | |
515 | ||
8eb9058d LP |
516 | if (server->timezone) { |
517 | r = dhcp_option_append( | |
518 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 519 | SD_DHCP_OPTION_NEW_TZDB_TIMEZONE, |
8eb9058d LP |
520 | strlen(server->timezone), server->timezone); |
521 | if (r < 0) | |
522 | return r; | |
523 | } | |
524 | ||
7354900d DW |
525 | ORDERED_HASHMAP_FOREACH(j, server->extra_options, i) { |
526 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
527 | j->option, j->length, j->data); | |
528 | if (r < 0) | |
529 | return r; | |
530 | } | |
531 | ||
532 | if (!ordered_hashmap_isempty(server->vendor_options)) { | |
564ca984 SS |
533 | r = dhcp_option_append( |
534 | &packet->dhcp, req->max_optlen, &offset, 0, | |
535 | SD_DHCP_OPTION_VENDOR_SPECIFIC, | |
7354900d | 536 | ordered_hashmap_size(server->vendor_options), server->vendor_options); |
564ca984 SS |
537 | if (r < 0) |
538 | return r; | |
539 | } | |
540 | ||
2dead812 TG |
541 | r = dhcp_server_send_packet(server, req, packet, DHCP_ACK, offset); |
542 | if (r < 0) | |
543 | return r; | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
bd57b450 TG |
548 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { |
549 | _cleanup_free_ DHCPPacket *packet = NULL; | |
550 | size_t offset; | |
551 | int r; | |
552 | ||
553 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); | |
554 | if (r < 0) | |
555 | return r; | |
556 | ||
b3ec603c | 557 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
bd57b450 TG |
558 | } |
559 | ||
a6f1e036 TG |
560 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
561 | be32_t gateway, uint8_t chaddr[]) { | |
52750344 TG |
562 | _cleanup_free_ DHCPPacket *packet = NULL; |
563 | size_t optoffset = 0; | |
564 | int r; | |
565 | ||
566 | assert(server); | |
567 | assert(address != INADDR_ANY); | |
568 | assert(chaddr); | |
569 | ||
570 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
571 | if (!packet) | |
572 | return -ENOMEM; | |
573 | ||
574 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
76253e73 DW |
575 | DHCP_FORCERENEW, ARPHRD_ETHER, |
576 | DHCP_MIN_OPTIONS_SIZE, &optoffset); | |
52750344 TG |
577 | if (r < 0) |
578 | return r; | |
579 | ||
580 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
22805d92 | 581 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL); |
52750344 TG |
582 | if (r < 0) |
583 | return r; | |
584 | ||
585 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); | |
586 | ||
8eb7b6a5 PF |
587 | r = dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, |
588 | &packet->dhcp, | |
52750344 | 589 | sizeof(DHCPMessage) + optoffset); |
c15fb62a TA |
590 | if (r < 0) |
591 | return r; | |
52750344 TG |
592 | |
593 | return 0; | |
594 | } | |
595 | ||
b3ec603c | 596 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
89ca10c6 | 597 | DHCPRequest *req = userdata; |
816e2e7a TG |
598 | |
599 | assert(req); | |
600 | ||
601 | switch(code) { | |
22805d92 | 602 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
c7d9ffe6 | 603 | if (len == 4) |
9ae84244 | 604 | req->lifetime = unaligned_read_be32(option); |
c7d9ffe6 TG |
605 | |
606 | break; | |
22805d92 | 607 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
2dead812 | 608 | if (len == 4) |
9ae84244 | 609 | memcpy(&req->requested_ip, option, sizeof(be32_t)); |
2dead812 TG |
610 | |
611 | break; | |
22805d92 | 612 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
816e2e7a | 613 | if (len == 4) |
9ae84244 | 614 | memcpy(&req->server_id, option, sizeof(be32_t)); |
816e2e7a TG |
615 | |
616 | break; | |
22805d92 | 617 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
816e2e7a TG |
618 | if (len >= 2) { |
619 | uint8_t *data; | |
620 | ||
621 | data = memdup(option, len); | |
622 | if (!data) | |
623 | return -ENOMEM; | |
624 | ||
625 | free(req->client_id.data); | |
626 | req->client_id.data = data; | |
627 | req->client_id.length = len; | |
628 | } | |
629 | ||
630 | break; | |
22805d92 | 631 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
76a9d0f1 LP |
632 | |
633 | if (len == 2 && unaligned_read_be16(option) >= sizeof(DHCPPacket)) | |
9ae84244 | 634 | req->max_optlen = unaligned_read_be16(option) - sizeof(DHCPPacket); |
816e2e7a TG |
635 | |
636 | break; | |
637 | } | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
642 | static void dhcp_request_free(DHCPRequest *req) { | |
643 | if (!req) | |
644 | return; | |
645 | ||
646 | free(req->client_id.data); | |
647 | free(req); | |
648 | } | |
649 | ||
650 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
816e2e7a | 651 | |
586ac6f7 | 652 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
816e2e7a TG |
653 | assert(req); |
654 | assert(message); | |
655 | ||
656 | req->message = message; | |
657 | ||
e2acdb6b | 658 | /* set client id based on MAC address if client did not send an explicit |
a6f1e036 | 659 | one */ |
816e2e7a | 660 | if (!req->client_id.data) { |
9a0f246f | 661 | void *data; |
816e2e7a | 662 | |
9a0f246f | 663 | data = malloc0(ETH_ALEN + 1); |
816e2e7a TG |
664 | if (!data) |
665 | return -ENOMEM; | |
666 | ||
9a0f246f LP |
667 | ((uint8_t*) data)[0] = 0x01; |
668 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN); | |
669 | ||
816e2e7a TG |
670 | req->client_id.length = ETH_ALEN + 1; |
671 | req->client_id.data = data; | |
816e2e7a TG |
672 | } |
673 | ||
674 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) | |
675 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
676 | ||
9a0f246f | 677 | if (req->lifetime <= 0) |
586ac6f7 LP |
678 | req->lifetime = MAX(1ULL, server->default_lease_time); |
679 | ||
680 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
681 | req->lifetime = server->max_lease_time; | |
c7d9ffe6 | 682 | |
816e2e7a TG |
683 | return 0; |
684 | } | |
685 | ||
87322b3a TG |
686 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { |
687 | assert(server); | |
688 | ||
689 | if (!server->pool_size) | |
690 | return -EINVAL; | |
691 | ||
99634696 TG |
692 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
693 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
694 | return -ERANGE; | |
87322b3a | 695 | |
99634696 | 696 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
87322b3a TG |
697 | } |
698 | ||
83cedf7a TG |
699 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
700 | ||
be077570 TG |
701 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, |
702 | size_t length) { | |
8e766630 | 703 | _cleanup_(dhcp_request_freep) DHCPRequest *req = NULL; |
f693e9b3 | 704 | _cleanup_free_ char *error_message = NULL; |
87322b3a | 705 | DHCPLease *existing_lease; |
816e2e7a | 706 | int type, r; |
be077570 TG |
707 | |
708 | assert(server); | |
709 | assert(message); | |
710 | ||
711 | if (message->op != BOOTREQUEST || | |
712 | message->htype != ARPHRD_ETHER || | |
713 | message->hlen != ETHER_ADDR_LEN) | |
714 | return 0; | |
715 | ||
816e2e7a TG |
716 | req = new0(DHCPRequest, 1); |
717 | if (!req) | |
718 | return -ENOMEM; | |
719 | ||
f693e9b3 | 720 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
be077570 TG |
721 | if (type < 0) |
722 | return 0; | |
723 | ||
586ac6f7 | 724 | r = ensure_sane_request(server, req, message); |
816e2e7a TG |
725 | if (r < 0) |
726 | /* this only fails on critical errors */ | |
727 | return r; | |
728 | ||
a6f1e036 TG |
729 | existing_lease = hashmap_get(server->leases_by_client_id, |
730 | &req->client_id); | |
87322b3a | 731 | |
4dc35568 | 732 | switch(type) { |
9a0f246f LP |
733 | |
734 | case DHCP_DISCOVER: { | |
87322b3a TG |
735 | be32_t address = INADDR_ANY; |
736 | unsigned i; | |
2dead812 | 737 | |
4dc35568 TG |
738 | log_dhcp_server(server, "DISCOVER (0x%x)", |
739 | be32toh(req->message->xid)); | |
740 | ||
2dead812 TG |
741 | if (!server->pool_size) |
742 | /* no pool allocated */ | |
743 | return 0; | |
744 | ||
87322b3a TG |
745 | /* for now pick a random free address from the pool */ |
746 | if (existing_lease) | |
747 | address = existing_lease->address; | |
748 | else { | |
b826ab58 | 749 | struct siphash state; |
0cb3c286 | 750 | uint64_t hash; |
99634696 | 751 | uint32_t next_offer; |
83cedf7a TG |
752 | |
753 | /* even with no persistence of leases, we try to offer the same client | |
754 | the same IP address. we do this by using the hash of the client id | |
755 | as the offset into the pool of leases when finding the next free one */ | |
756 | ||
0cb3c286 | 757 | siphash24_init(&state, HASH_KEY.bytes); |
b826ab58 | 758 | client_id_hash_func(&req->client_id, &state); |
933f9cae | 759 | hash = htole64(siphash24_finalize(&state)); |
0cb3c286 | 760 | next_offer = hash % server->pool_size; |
83cedf7a | 761 | |
87322b3a | 762 | for (i = 0; i < server->pool_size; i++) { |
83cedf7a | 763 | if (!server->bound_leases[next_offer]) { |
99634696 | 764 | address = server->subnet | htobe32(server->pool_offset + next_offer); |
87322b3a | 765 | break; |
6408ba5f LP |
766 | } |
767 | ||
768 | next_offer = (next_offer + 1) % server->pool_size; | |
87322b3a TG |
769 | } |
770 | } | |
771 | ||
772 | if (address == INADDR_ANY) | |
773 | /* no free addresses left */ | |
774 | return 0; | |
2dead812 TG |
775 | |
776 | r = server_send_offer(server, req, address); | |
6e741541 | 777 | if (r < 0) |
4dc35568 | 778 | /* this only fails on critical errors */ |
6e741541 | 779 | return log_dhcp_server_errno(server, r, "Could not send offer: %m"); |
be077570 | 780 | |
6e741541 LP |
781 | log_dhcp_server(server, "OFFER (0x%x)", be32toh(req->message->xid)); |
782 | return DHCP_OFFER; | |
4dc35568 | 783 | } |
5b34277c | 784 | case DHCP_DECLINE: |
f693e9b3 | 785 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message)); |
5b34277c TG |
786 | |
787 | /* TODO: make sure we don't offer this address again */ | |
788 | ||
789 | return 1; | |
790 | ||
9a0f246f | 791 | case DHCP_REQUEST: { |
2dead812 | 792 | be32_t address; |
bd57b450 | 793 | bool init_reboot = false; |
87322b3a | 794 | int pool_offset; |
2dead812 TG |
795 | |
796 | /* see RFC 2131, section 4.3.2 */ | |
797 | ||
798 | if (req->server_id) { | |
799 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", | |
800 | be32toh(req->message->xid)); | |
801 | ||
802 | /* SELECTING */ | |
803 | if (req->server_id != server->address) | |
804 | /* client did not pick us */ | |
805 | return 0; | |
806 | ||
807 | if (req->message->ciaddr) | |
808 | /* this MUST be zero */ | |
809 | return 0; | |
810 | ||
811 | if (!req->requested_ip) | |
812 | /* this must be filled in with the yiaddr | |
813 | from the chosen OFFER */ | |
814 | return 0; | |
815 | ||
816 | address = req->requested_ip; | |
817 | } else if (req->requested_ip) { | |
818 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", | |
819 | be32toh(req->message->xid)); | |
820 | ||
821 | /* INIT-REBOOT */ | |
822 | if (req->message->ciaddr) | |
823 | /* this MUST be zero */ | |
824 | return 0; | |
825 | ||
bd57b450 | 826 | /* TODO: check more carefully if IP is correct */ |
2dead812 | 827 | address = req->requested_ip; |
bd57b450 | 828 | init_reboot = true; |
2dead812 TG |
829 | } else { |
830 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
831 | be32toh(req->message->xid)); | |
832 | ||
833 | /* REBINDING / RENEWING */ | |
834 | if (!req->message->ciaddr) | |
835 | /* this MUST be filled in with clients IP address */ | |
836 | return 0; | |
837 | ||
838 | address = req->message->ciaddr; | |
839 | } | |
840 | ||
87322b3a TG |
841 | pool_offset = get_pool_offset(server, address); |
842 | ||
843 | /* verify that the requested address is from the pool, and either | |
844 | owned by the current client or free */ | |
845 | if (pool_offset >= 0 && | |
846 | server->bound_leases[pool_offset] == existing_lease) { | |
847 | DHCPLease *lease; | |
a7f7d1bd | 848 | usec_t time_now = 0; |
87322b3a TG |
849 | |
850 | if (!existing_lease) { | |
851 | lease = new0(DHCPLease, 1); | |
357e1b17 LP |
852 | if (!lease) |
853 | return -ENOMEM; | |
28c78e07 | 854 | lease->address = address; |
87322b3a TG |
855 | lease->client_id.data = memdup(req->client_id.data, |
856 | req->client_id.length); | |
02557f97 TA |
857 | if (!lease->client_id.data) { |
858 | free(lease); | |
87322b3a | 859 | return -ENOMEM; |
02557f97 | 860 | } |
87322b3a | 861 | lease->client_id.length = req->client_id.length; |
a6f1e036 TG |
862 | memcpy(&lease->chaddr, &req->message->chaddr, |
863 | ETH_ALEN); | |
52750344 | 864 | lease->gateway = req->message->giaddr; |
87322b3a TG |
865 | } else |
866 | lease = existing_lease; | |
867 | ||
a6f1e036 TG |
868 | r = sd_event_now(server->event, |
869 | clock_boottime_or_monotonic(), | |
870 | &time_now); | |
bff92d2c SS |
871 | if (r < 0) { |
872 | if (!existing_lease) | |
873 | dhcp_lease_free(lease); | |
38a03f06 | 874 | return r; |
bff92d2c SS |
875 | } |
876 | ||
87322b3a TG |
877 | lease->expiration = req->lifetime * USEC_PER_SEC + time_now; |
878 | ||
2dead812 TG |
879 | r = server_send_ack(server, req, address); |
880 | if (r < 0) { | |
881 | /* this only fails on critical errors */ | |
6e741541 | 882 | log_dhcp_server_errno(server, r, "Could not send ack: %m"); |
87322b3a TG |
883 | |
884 | if (!existing_lease) | |
885 | dhcp_lease_free(lease); | |
886 | ||
2dead812 TG |
887 | return r; |
888 | } else { | |
889 | log_dhcp_server(server, "ACK (0x%x)", | |
890 | be32toh(req->message->xid)); | |
87322b3a TG |
891 | |
892 | server->bound_leases[pool_offset] = lease; | |
a6f1e036 TG |
893 | hashmap_put(server->leases_by_client_id, |
894 | &lease->client_id, lease); | |
87322b3a | 895 | |
2dead812 TG |
896 | return DHCP_ACK; |
897 | } | |
6e741541 | 898 | |
bd57b450 TG |
899 | } else if (init_reboot) { |
900 | r = server_send_nak(server, req); | |
6e741541 | 901 | if (r < 0) |
bd57b450 | 902 | /* this only fails on critical errors */ |
6e741541 LP |
903 | return log_dhcp_server_errno(server, r, "Could not send nak: %m"); |
904 | ||
905 | log_dhcp_server(server, "NAK (0x%x)", be32toh(req->message->xid)); | |
906 | return DHCP_NAK; | |
bd57b450 | 907 | } |
2dead812 TG |
908 | |
909 | break; | |
910 | } | |
9a0f246f | 911 | |
500792d8 TG |
912 | case DHCP_RELEASE: { |
913 | int pool_offset; | |
914 | ||
915 | log_dhcp_server(server, "RELEASE (0x%x)", | |
916 | be32toh(req->message->xid)); | |
917 | ||
918 | if (!existing_lease) | |
919 | return 0; | |
920 | ||
921 | if (existing_lease->address != req->message->ciaddr) | |
922 | return 0; | |
923 | ||
924 | pool_offset = get_pool_offset(server, req->message->ciaddr); | |
925 | if (pool_offset < 0) | |
926 | return 0; | |
927 | ||
928 | if (server->bound_leases[pool_offset] == existing_lease) { | |
929 | server->bound_leases[pool_offset] = NULL; | |
930 | hashmap_remove(server->leases_by_client_id, existing_lease); | |
931 | dhcp_lease_free(existing_lease); | |
c3922c0c | 932 | } |
500792d8 | 933 | |
c3922c0c LP |
934 | return 0; |
935 | }} | |
4dc35568 TG |
936 | |
937 | return 0; | |
be077570 TG |
938 | } |
939 | ||
ff734080 TG |
940 | static int server_receive_message(sd_event_source *s, int fd, |
941 | uint32_t revents, void *userdata) { | |
be077570 | 942 | _cleanup_free_ DHCPMessage *message = NULL; |
3a864fe4 | 943 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))]; |
ff734080 TG |
944 | sd_dhcp_server *server = userdata; |
945 | struct iovec iov = {}; | |
946 | struct msghdr msg = { | |
947 | .msg_iov = &iov, | |
948 | .msg_iovlen = 1, | |
3a864fe4 TG |
949 | .msg_control = cmsgbuf, |
950 | .msg_controllen = sizeof(cmsgbuf), | |
ff734080 | 951 | }; |
3a864fe4 | 952 | struct cmsghdr *cmsg; |
4edc2c9b | 953 | ssize_t buflen, len; |
57027d03 | 954 | int r; |
ff734080 TG |
955 | |
956 | assert(server); | |
957 | ||
4edc2c9b LP |
958 | buflen = next_datagram_size_fd(fd); |
959 | if (buflen < 0) | |
960 | return buflen; | |
ff734080 | 961 | |
0d43d2fc | 962 | message = malloc(buflen); |
ff734080 TG |
963 | if (!message) |
964 | return -ENOMEM; | |
965 | ||
cb310866 | 966 | iov = IOVEC_MAKE(message, buflen); |
ff734080 | 967 | |
a38d9945 | 968 | len = recvmsg(fd, &msg, 0); |
0d43d2fc | 969 | if (len < 0) { |
4c701096 | 970 | if (IN_SET(errno, EAGAIN, EINTR)) |
0d43d2fc TG |
971 | return 0; |
972 | ||
973 | return -errno; | |
6408ba5f LP |
974 | } |
975 | if ((size_t)len < sizeof(DHCPMessage)) | |
be077570 | 976 | return 0; |
ff734080 | 977 | |
2a1288ff | 978 | CMSG_FOREACH(cmsg, &msg) { |
3a864fe4 TG |
979 | if (cmsg->cmsg_level == IPPROTO_IP && |
980 | cmsg->cmsg_type == IP_PKTINFO && | |
981 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) { | |
982 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg); | |
983 | ||
a6f1e036 TG |
984 | /* TODO figure out if this can be done as a filter on |
985 | * the socket, like for IPv6 */ | |
b3ec603c | 986 | if (server->ifindex != info->ipi_ifindex) |
3a864fe4 TG |
987 | return 0; |
988 | ||
989 | break; | |
990 | } | |
991 | } | |
992 | ||
57027d03 LP |
993 | r = dhcp_server_handle_message(server, message, (size_t) len); |
994 | if (r < 0) | |
995 | log_dhcp_server_errno(server, r, "Couldn't process incoming message: %m"); | |
996 | ||
997 | return 0; | |
ff734080 TG |
998 | } |
999 | ||
1000 | int sd_dhcp_server_start(sd_dhcp_server *server) { | |
1001 | int r; | |
1002 | ||
1003 | assert_return(server, -EINVAL); | |
1004 | assert_return(server->event, -EINVAL); | |
1005 | assert_return(!server->receive_message, -EBUSY); | |
cfcbb135 LP |
1006 | assert_return(server->fd_raw < 0, -EBUSY); |
1007 | assert_return(server->fd < 0, -EBUSY); | |
20af7091 | 1008 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH); |
ff734080 | 1009 | |
3e29b889 | 1010 | r = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0); |
8de4a226 TG |
1011 | if (r < 0) { |
1012 | r = -errno; | |
1013 | sd_dhcp_server_stop(server); | |
1014 | return r; | |
1015 | } | |
1016 | server->fd_raw = r; | |
1017 | ||
afe42aef | 1018 | r = dhcp_network_bind_udp_socket(server->ifindex, INADDR_ANY, DHCP_PORT_SERVER, -1); |
ff734080 TG |
1019 | if (r < 0) { |
1020 | sd_dhcp_server_stop(server); | |
1021 | return r; | |
1022 | } | |
1023 | server->fd = r; | |
1024 | ||
1025 | r = sd_event_add_io(server->event, &server->receive_message, | |
1026 | server->fd, EPOLLIN, | |
1027 | server_receive_message, server); | |
1028 | if (r < 0) { | |
1029 | sd_dhcp_server_stop(server); | |
1030 | return r; | |
1031 | } | |
1032 | ||
1033 | r = sd_event_source_set_priority(server->receive_message, | |
1034 | server->event_priority); | |
1035 | if (r < 0) { | |
1036 | sd_dhcp_server_stop(server); | |
1037 | return r; | |
1038 | } | |
1039 | ||
1040 | log_dhcp_server(server, "STARTED"); | |
1041 | ||
1042 | return 0; | |
1043 | } | |
52750344 TG |
1044 | |
1045 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { | |
1046 | unsigned i; | |
621ac3d2 | 1047 | int r = 0; |
52750344 TG |
1048 | |
1049 | assert_return(server, -EINVAL); | |
1050 | assert(server->bound_leases); | |
1051 | ||
1052 | for (i = 0; i < server->pool_size; i++) { | |
1053 | DHCPLease *lease = server->bound_leases[i]; | |
1054 | ||
99634696 | 1055 | if (!lease || lease == &server->invalid_lease) |
52750344 TG |
1056 | continue; |
1057 | ||
1058 | r = server_send_forcerenew(server, lease->address, | |
1059 | lease->gateway, | |
1060 | lease->chaddr); | |
1061 | if (r < 0) | |
1062 | return r; | |
6408ba5f LP |
1063 | |
1064 | log_dhcp_server(server, "FORCERENEW"); | |
52750344 TG |
1065 | } |
1066 | ||
1067 | return r; | |
1068 | } | |
8eb9058d | 1069 | |
64d6c229 | 1070 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { |
8eb9058d LP |
1071 | int r; |
1072 | ||
1073 | assert_return(server, -EINVAL); | |
089fb865 | 1074 | assert_return(timezone_is_valid(tz, LOG_DEBUG), -EINVAL); |
8eb9058d | 1075 | |
64d6c229 | 1076 | if (streq_ptr(tz, server->timezone)) |
8eb9058d LP |
1077 | return 0; |
1078 | ||
64d6c229 | 1079 | r = free_and_strdup(&server->timezone, tz); |
8eb9058d LP |
1080 | if (r < 0) |
1081 | return r; | |
1082 | ||
1083 | return 1; | |
1084 | } | |
586ac6f7 LP |
1085 | |
1086 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1087 | assert_return(server, -EINVAL); | |
1088 | ||
1089 | if (t == server->max_lease_time) | |
1090 | return 0; | |
1091 | ||
1092 | server->max_lease_time = t; | |
1093 | return 1; | |
1094 | } | |
1095 | ||
1096 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1097 | assert_return(server, -EINVAL); | |
1098 | ||
1099 | if (t == server->default_lease_time) | |
1100 | return 0; | |
1101 | ||
1102 | server->default_lease_time = t; | |
1103 | return 1; | |
1104 | } | |
1a04db0f LP |
1105 | |
1106 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], unsigned n) { | |
1107 | assert_return(server, -EINVAL); | |
1108 | assert_return(dns || n <= 0, -EINVAL); | |
1109 | ||
1110 | if (server->n_dns == n && | |
1111 | memcmp(server->dns, dns, sizeof(struct in_addr) * n) == 0) | |
1112 | return 0; | |
1113 | ||
1114 | if (n <= 0) { | |
1115 | server->dns = mfree(server->dns); | |
1116 | server->n_dns = 0; | |
1117 | } else { | |
1118 | struct in_addr *c; | |
1119 | ||
1120 | c = newdup(struct in_addr, dns, n); | |
1121 | if (!c) | |
1122 | return -ENOMEM; | |
1123 | ||
1124 | free(server->dns); | |
1125 | server->dns = c; | |
1126 | server->n_dns = n; | |
1127 | } | |
1128 | ||
1129 | return 1; | |
1130 | } | |
1131 | ||
1132 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], unsigned n) { | |
1133 | assert_return(server, -EINVAL); | |
1134 | assert_return(ntp || n <= 0, -EINVAL); | |
1135 | ||
1136 | if (server->n_ntp == n && | |
1137 | memcmp(server->ntp, ntp, sizeof(struct in_addr) * n) == 0) | |
1138 | return 0; | |
1139 | ||
1140 | if (n <= 0) { | |
1141 | server->ntp = mfree(server->ntp); | |
1142 | server->n_ntp = 0; | |
1143 | } else { | |
1144 | struct in_addr *c; | |
1145 | ||
1146 | c = newdup(struct in_addr, ntp, n); | |
1147 | if (!c) | |
1148 | return -ENOMEM; | |
1149 | ||
1150 | free(server->ntp); | |
1151 | server->ntp = c; | |
1152 | server->n_ntp = n; | |
1153 | } | |
1154 | ||
1155 | return 1; | |
1156 | } | |
77ff6022 | 1157 | |
299d578f SS |
1158 | int sd_dhcp_server_set_sip(sd_dhcp_server *server, const struct in_addr sip[], unsigned n) { |
1159 | assert_return(server, -EINVAL); | |
1160 | assert_return(sip || n <= 0, -EINVAL); | |
1161 | ||
1162 | if (server->n_sip == n && | |
1163 | memcmp(server->sip, sip, sizeof(struct in_addr) * n) == 0) | |
1164 | return 0; | |
1165 | ||
1166 | if (n <= 0) { | |
1167 | server->sip = mfree(server->sip); | |
1168 | server->n_sip = 0; | |
1169 | } else { | |
1170 | struct in_addr *c; | |
1171 | ||
1172 | c = newdup(struct in_addr, sip, n); | |
1173 | if (!c) | |
1174 | return -ENOMEM; | |
1175 | ||
1176 | free(server->sip); | |
1177 | server->sip = c; | |
1178 | server->n_sip = n; | |
1179 | } | |
1180 | ||
1181 | return 1; | |
1182 | } | |
1183 | ||
77ff6022 CG |
1184 | int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled) { |
1185 | assert_return(server, -EINVAL); | |
1186 | ||
1187 | if (enabled == server->emit_router) | |
1188 | return 0; | |
1189 | ||
1190 | server->emit_router = enabled; | |
1191 | ||
1192 | return 1; | |
1193 | } | |
564ca984 | 1194 | |
461dbb2f | 1195 | int sd_dhcp_server_add_option(sd_dhcp_server *server, sd_dhcp_option *v) { |
564ca984 SS |
1196 | int r; |
1197 | ||
1198 | assert_return(server, -EINVAL); | |
1199 | assert_return(v, -EINVAL); | |
1200 | ||
7354900d DW |
1201 | r = ordered_hashmap_ensure_allocated(&server->extra_options, &dhcp_option_hash_ops); |
1202 | if (r < 0) | |
1203 | return r; | |
1204 | ||
1205 | r = ordered_hashmap_put(server->extra_options, UINT_TO_PTR(v->option), v); | |
1206 | if (r < 0) | |
1207 | return r; | |
1208 | ||
1209 | sd_dhcp_option_ref(v); | |
1210 | return 0; | |
1211 | } | |
1212 | ||
1213 | int sd_dhcp_server_add_vendor_option(sd_dhcp_server *server, sd_dhcp_option *v) { | |
1214 | int r; | |
1215 | ||
1216 | assert_return(server, -EINVAL); | |
1217 | assert_return(v, -EINVAL); | |
1218 | ||
1219 | r = ordered_hashmap_ensure_allocated(&server->vendor_options, &dhcp_option_hash_ops); | |
564ca984 SS |
1220 | if (r < 0) |
1221 | return -ENOMEM; | |
1222 | ||
7354900d | 1223 | r = ordered_hashmap_put(server->vendor_options, v, v); |
564ca984 SS |
1224 | if (r < 0) |
1225 | return r; | |
1226 | ||
461dbb2f | 1227 | sd_dhcp_option_ref(v); |
564ca984 SS |
1228 | |
1229 | return 1; | |
1230 | } |