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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" |
ebffea2a | 18 | #include "ordered-set.h" |
07630cea LP |
19 | #include "siphash24.h" |
20 | #include "string-util.h" | |
9ae84244 | 21 | #include "unaligned.h" |
b44cd882 | 22 | |
586ac6f7 LP |
23 | #define DHCP_DEFAULT_LEASE_TIME_USEC USEC_PER_HOUR |
24 | #define DHCP_MAX_LEASE_TIME_USEC (USEC_PER_HOUR*12) | |
4dc35568 | 25 | |
6121fc30 | 26 | static DHCPLease *dhcp_lease_free(DHCPLease *lease) { |
45a9eac9 | 27 | if (!lease) |
6121fc30 | 28 | return NULL; |
45a9eac9 RM |
29 | |
30 | free(lease->client_id.data); | |
6121fc30 | 31 | return mfree(lease); |
45a9eac9 RM |
32 | } |
33 | ||
99634696 TG |
34 | /* configures the server's address and subnet, and optionally the pool's size and offset into the subnet |
35 | * the whole pool must fit into the subnet, and may not contain the first (any) nor last (broadcast) address | |
36 | * moreover, the server's own address may be in the pool, and is in that case reserved in order not to | |
37 | * accidentally hand it out */ | |
90810f7a LP |
38 | int sd_dhcp_server_configure_pool( |
39 | sd_dhcp_server *server, | |
40 | const struct in_addr *address, | |
41 | unsigned char prefixlen, | |
42 | uint32_t offset, | |
43 | uint32_t size) { | |
44 | ||
99634696 TG |
45 | struct in_addr netmask_addr; |
46 | be32_t netmask; | |
47 | uint32_t server_off, broadcast_off, size_max; | |
48 | ||
2dead812 TG |
49 | assert_return(server, -EINVAL); |
50 | assert_return(address, -EINVAL); | |
99634696 TG |
51 | assert_return(address->s_addr != INADDR_ANY, -EINVAL); |
52 | assert_return(prefixlen <= 32, -ERANGE); | |
99634696 | 53 | |
5a941f5f | 54 | assert_se(in4_addr_prefixlen_to_netmask(&netmask_addr, prefixlen)); |
99634696 TG |
55 | netmask = netmask_addr.s_addr; |
56 | ||
57 | server_off = be32toh(address->s_addr & ~netmask); | |
58 | broadcast_off = be32toh(~netmask); | |
59 | ||
60 | /* the server address cannot be the subnet address */ | |
61 | assert_return(server_off != 0, -ERANGE); | |
62 | ||
63 | /* nor the broadcast address */ | |
64 | assert_return(server_off != broadcast_off, -ERANGE); | |
65 | ||
66 | /* 0 offset means we should set a default, we skip the first (subnet) address | |
67 | and take the next one */ | |
68 | if (offset == 0) | |
69 | offset = 1; | |
70 | ||
71 | size_max = (broadcast_off + 1) /* the number of addresses in the subnet */ | |
72 | - offset /* exclude the addresses before the offset */ | |
73 | - 1; /* exclude the last (broadcast) address */ | |
74 | ||
75 | /* The pool must contain at least one address */ | |
76 | assert_return(size_max >= 1, -ERANGE); | |
77 | ||
78 | if (size != 0) | |
79 | assert_return(size <= size_max, -ERANGE); | |
80 | else | |
81 | size = size_max; | |
87322b3a | 82 | |
45a9eac9 | 83 | if (server->address != address->s_addr || server->netmask != netmask || server->pool_size != size || server->pool_offset != offset) { |
45a9eac9 RM |
84 | |
85 | free(server->bound_leases); | |
86 | server->bound_leases = new0(DHCPLease*, size); | |
87 | if (!server->bound_leases) | |
88 | return -ENOMEM; | |
2dead812 | 89 | |
45a9eac9 RM |
90 | server->pool_offset = offset; |
91 | server->pool_size = size; | |
2dead812 | 92 | |
45a9eac9 RM |
93 | server->address = address->s_addr; |
94 | server->netmask = netmask; | |
95 | server->subnet = address->s_addr & netmask; | |
99634696 | 96 | |
45a9eac9 RM |
97 | if (server_off >= offset && server_off - offset < size) |
98 | server->bound_leases[server_off - offset] = &server->invalid_lease; | |
99 | ||
100 | /* Drop any leases associated with the old address range */ | |
6121fc30 | 101 | hashmap_clear(server->leases_by_client_id); |
36d35f22 MAL |
102 | |
103 | if (server->callback) | |
104 | server->callback(server, SD_DHCP_SERVER_EVENT_LEASE_CHANGED, server->callback_userdata); | |
45a9eac9 | 105 | } |
20af7091 TG |
106 | |
107 | return 0; | |
108 | } | |
109 | ||
04c01369 | 110 | int sd_dhcp_server_is_running(sd_dhcp_server *server) { |
75677581 | 111 | assert_return(server, false); |
7c16313f TG |
112 | |
113 | return !!server->receive_message; | |
114 | } | |
115 | ||
7a08d314 | 116 | void client_id_hash_func(const DHCPClientId *id, struct siphash *state) { |
87322b3a TG |
117 | assert(id); |
118 | assert(id->length); | |
119 | assert(id->data); | |
120 | ||
1e2527a6 | 121 | siphash24_compress(&id->length, sizeof(id->length), state); |
b826ab58 | 122 | siphash24_compress(id->data, id->length, state); |
87322b3a TG |
123 | } |
124 | ||
7a08d314 | 125 | int client_id_compare_func(const DHCPClientId *a, const DHCPClientId *b) { |
a0edd02e | 126 | int r; |
87322b3a | 127 | |
87322b3a TG |
128 | assert(!a->length || a->data); |
129 | assert(!b->length || b->data); | |
130 | ||
a0edd02e FB |
131 | r = CMP(a->length, b->length); |
132 | if (r != 0) | |
133 | return r; | |
87322b3a TG |
134 | |
135 | return memcmp(a->data, b->data, a->length); | |
136 | } | |
137 | ||
6121fc30 YW |
138 | DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(dhcp_lease_hash_ops, DHCPClientId, client_id_hash_func, client_id_compare_func, |
139 | DHCPLease, dhcp_lease_free); | |
d5099efc | 140 | |
8301aa0b | 141 | static sd_dhcp_server *dhcp_server_free(sd_dhcp_server *server) { |
8301aa0b | 142 | assert(server); |
ff734080 | 143 | |
3bdace9b | 144 | log_dhcp_server(server, "UNREF"); |
87322b3a | 145 | |
3bdace9b | 146 | sd_dhcp_server_stop(server); |
87322b3a | 147 | |
3bdace9b LP |
148 | sd_event_unref(server->event); |
149 | ||
8eb9058d | 150 | free(server->timezone); |
ddb82ec2 LP |
151 | |
152 | for (sd_dhcp_lease_server_type i = 0; i < _SD_DHCP_LEASE_SERVER_TYPE_MAX; i++) | |
153 | free(server->servers[i].addr); | |
8eb9058d | 154 | |
3bdace9b LP |
155 | hashmap_free(server->leases_by_client_id); |
156 | ||
ebffea2a SS |
157 | ordered_set_free(server->extra_options); |
158 | ordered_set_free(server->vendor_options); | |
564ca984 | 159 | |
3bdace9b | 160 | free(server->bound_leases); |
6b430fdb | 161 | return mfree(server); |
b44cd882 TG |
162 | } |
163 | ||
8301aa0b YW |
164 | DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_server, sd_dhcp_server, dhcp_server_free); |
165 | ||
3a864fe4 | 166 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
4afd3348 | 167 | _cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL; |
b44cd882 TG |
168 | |
169 | assert_return(ret, -EINVAL); | |
3a864fe4 | 170 | assert_return(ifindex > 0, -EINVAL); |
b44cd882 TG |
171 | |
172 | server = new0(sd_dhcp_server, 1); | |
173 | if (!server) | |
174 | return -ENOMEM; | |
175 | ||
3733eec3 | 176 | server->n_ref = 1; |
8de4a226 | 177 | server->fd_raw = -1; |
ff734080 | 178 | server->fd = -1; |
20af7091 | 179 | server->address = htobe32(INADDR_ANY); |
59b8f6b6 | 180 | server->netmask = htobe32(INADDR_ANY); |
b3ec603c | 181 | server->ifindex = ifindex; |
357e1b17 | 182 | |
6121fc30 | 183 | server->leases_by_client_id = hashmap_new(&dhcp_lease_hash_ops); |
357e1b17 LP |
184 | if (!server->leases_by_client_id) |
185 | return -ENOMEM; | |
186 | ||
586ac6f7 LP |
187 | server->default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC); |
188 | server->max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC); | |
b44cd882 | 189 | |
1cc6c93a | 190 | *ret = TAKE_PTR(server); |
b44cd882 TG |
191 | |
192 | return 0; | |
193 | } | |
194 | ||
32d20645 | 195 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int64_t priority) { |
b44cd882 TG |
196 | int r; |
197 | ||
198 | assert_return(server, -EINVAL); | |
199 | assert_return(!server->event, -EBUSY); | |
200 | ||
201 | if (event) | |
202 | server->event = sd_event_ref(event); | |
203 | else { | |
204 | r = sd_event_default(&server->event); | |
205 | if (r < 0) | |
206 | return r; | |
207 | } | |
208 | ||
209 | server->event_priority = priority; | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
215 | assert_return(server, -EINVAL); | |
216 | ||
217 | server->event = sd_event_unref(server->event); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
223 | assert_return(server, NULL); | |
224 | ||
225 | return server->event; | |
226 | } | |
ff734080 TG |
227 | |
228 | int sd_dhcp_server_stop(sd_dhcp_server *server) { | |
c8bae363 YW |
229 | if (!server) |
230 | return 0; | |
ff734080 TG |
231 | |
232 | server->receive_message = | |
233 | sd_event_source_unref(server->receive_message); | |
234 | ||
8de4a226 | 235 | server->fd_raw = safe_close(server->fd_raw); |
ff734080 TG |
236 | server->fd = safe_close(server->fd); |
237 | ||
238 | log_dhcp_server(server, "STOPPED"); | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
a6f1e036 TG |
243 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
244 | DHCPPacket *packet, size_t len) { | |
969b009d TG |
245 | union sockaddr_union link = { |
246 | .ll.sll_family = AF_PACKET, | |
8e38570e | 247 | .ll.sll_protocol = htobe16(ETH_P_IP), |
b3ec603c | 248 | .ll.sll_ifindex = server->ifindex, |
969b009d TG |
249 | .ll.sll_halen = ETH_ALEN, |
250 | }; | |
969b009d TG |
251 | |
252 | assert(server); | |
b3ec603c | 253 | assert(server->ifindex > 0); |
969b009d TG |
254 | assert(server->address); |
255 | assert(packet); | |
256 | assert(len > sizeof(DHCPPacket)); | |
257 | ||
258 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN); | |
259 | ||
260 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, | |
a6f1e036 | 261 | packet->dhcp.yiaddr, |
afe42aef | 262 | DHCP_PORT_CLIENT, len, -1); |
969b009d | 263 | |
b3ec603c | 264 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
969b009d TG |
265 | } |
266 | ||
267 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
8eb7b6a5 | 268 | uint16_t destination_port, |
969b009d TG |
269 | DHCPMessage *message, size_t len) { |
270 | union sockaddr_union dest = { | |
271 | .in.sin_family = AF_INET, | |
8eb7b6a5 | 272 | .in.sin_port = htobe16(destination_port), |
969b009d TG |
273 | .in.sin_addr.s_addr = destination, |
274 | }; | |
275 | struct iovec iov = { | |
276 | .iov_base = message, | |
277 | .iov_len = len, | |
278 | }; | |
fb29cdbe | 279 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in_pktinfo))) control = {}; |
969b009d TG |
280 | struct msghdr msg = { |
281 | .msg_name = &dest, | |
282 | .msg_namelen = sizeof(dest.in), | |
283 | .msg_iov = &iov, | |
284 | .msg_iovlen = 1, | |
fb29cdbe LP |
285 | .msg_control = &control, |
286 | .msg_controllen = sizeof(control), | |
969b009d TG |
287 | }; |
288 | struct cmsghdr *cmsg; | |
289 | struct in_pktinfo *pktinfo; | |
969b009d TG |
290 | |
291 | assert(server); | |
4c9cb12c | 292 | assert(server->fd >= 0); |
969b009d TG |
293 | assert(message); |
294 | assert(len > sizeof(DHCPMessage)); | |
295 | ||
296 | cmsg = CMSG_FIRSTHDR(&msg); | |
297 | assert(cmsg); | |
298 | ||
299 | cmsg->cmsg_level = IPPROTO_IP; | |
300 | cmsg->cmsg_type = IP_PKTINFO; | |
301 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
302 | ||
303 | /* we attach source interface and address info to the message | |
304 | rather than binding the socket. This will be mostly useful | |
305 | when we gain support for arbitrary number of server addresses | |
306 | */ | |
307 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
308 | assert(pktinfo); | |
309 | ||
b3ec603c | 310 | pktinfo->ipi_ifindex = server->ifindex; |
969b009d TG |
311 | pktinfo->ipi_spec_dst.s_addr = server->address; |
312 | ||
0f01c1f9 | 313 | if (sendmsg(server->fd, &msg, 0) < 0) |
969b009d TG |
314 | return -errno; |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | static bool requested_broadcast(DHCPRequest *req) { | |
320 | assert(req); | |
321 | ||
322 | return req->message->flags & htobe16(0x8000); | |
323 | } | |
324 | ||
325 | int dhcp_server_send_packet(sd_dhcp_server *server, | |
326 | DHCPRequest *req, DHCPPacket *packet, | |
327 | int type, size_t optoffset) { | |
328 | be32_t destination = INADDR_ANY; | |
8eb7b6a5 | 329 | uint16_t destination_port = DHCP_PORT_CLIENT; |
969b009d TG |
330 | int r; |
331 | ||
332 | assert(server); | |
333 | assert(req); | |
334 | assert(req->max_optlen); | |
335 | assert(optoffset <= req->max_optlen); | |
336 | assert(packet); | |
337 | ||
338 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 339 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
969b009d TG |
340 | 4, &server->address); |
341 | if (r < 0) | |
342 | return r; | |
343 | ||
344 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 345 | SD_DHCP_OPTION_END, 0, NULL); |
969b009d TG |
346 | if (r < 0) |
347 | return r; | |
348 | ||
349 | /* RFC 2131 Section 4.1 | |
350 | ||
351 | If the ’giaddr’ field in a DHCP message from a client is non-zero, | |
352 | the server sends any return messages to the ’DHCP server’ port on the | |
353 | BOOTP relay agent whose address appears in ’giaddr’. If the ’giaddr’ | |
354 | field is zero and the ’ciaddr’ field is nonzero, then the server | |
355 | unicasts DHCPOFFER and DHCPACK messages to the address in ’ciaddr’. | |
356 | If ’giaddr’ is zero and ’ciaddr’ is zero, and the broadcast bit is | |
357 | set, then the server broadcasts DHCPOFFER and DHCPACK messages to | |
358 | 0xffffffff. If the broadcast bit is not set and ’giaddr’ is zero and | |
359 | ’ciaddr’ is zero, then the server unicasts DHCPOFFER and DHCPACK | |
360 | messages to the client’s hardware address and ’yiaddr’ address. In | |
361 | all cases, when ’giaddr’ is zero, the server broadcasts any DHCPNAK | |
362 | messages to 0xffffffff. | |
363 | ||
364 | Section 4.3.2 | |
365 | ||
366 | If ’giaddr’ is set in the DHCPREQUEST message, the client is on a | |
367 | different subnet. The server MUST set the broadcast bit in the | |
368 | DHCPNAK, so that the relay agent will broadcast the DHCPNAK to the | |
369 | client, because the client may not have a correct network address | |
370 | or subnet mask, and the client may not be answering ARP requests. | |
371 | */ | |
372 | if (req->message->giaddr) { | |
373 | destination = req->message->giaddr; | |
8eb7b6a5 | 374 | destination_port = DHCP_PORT_SERVER; |
969b009d TG |
375 | if (type == DHCP_NAK) |
376 | packet->dhcp.flags = htobe16(0x8000); | |
377 | } else if (req->message->ciaddr && type != DHCP_NAK) | |
378 | destination = req->message->ciaddr; | |
379 | ||
d6bd972d | 380 | if (destination != INADDR_ANY) |
8eb7b6a5 PF |
381 | return dhcp_server_send_udp(server, destination, |
382 | destination_port, &packet->dhcp, | |
969b009d | 383 | sizeof(DHCPMessage) + optoffset); |
d6bd972d | 384 | else if (requested_broadcast(req) || type == DHCP_NAK) |
a6f1e036 | 385 | return dhcp_server_send_udp(server, INADDR_BROADCAST, |
8eb7b6a5 | 386 | destination_port, &packet->dhcp, |
d6bd972d | 387 | sizeof(DHCPMessage) + optoffset); |
969b009d | 388 | else |
a6f1e036 TG |
389 | /* we cannot send UDP packet to specific MAC address when the |
390 | address is not yet configured, so must fall back to raw | |
391 | packets */ | |
969b009d TG |
392 | return dhcp_server_send_unicast_raw(server, packet, |
393 | sizeof(DHCPPacket) + optoffset); | |
394 | } | |
395 | ||
4dc35568 | 396 | static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret, |
a6f1e036 TG |
397 | uint8_t type, size_t *_optoffset, |
398 | DHCPRequest *req) { | |
4dc35568 | 399 | _cleanup_free_ DHCPPacket *packet = NULL; |
1231c4d2 | 400 | size_t optoffset = 0; |
4dc35568 TG |
401 | int r; |
402 | ||
403 | assert(server); | |
404 | assert(ret); | |
405 | assert(_optoffset); | |
bd57b450 | 406 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)); |
4dc35568 TG |
407 | |
408 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen); | |
409 | if (!packet) | |
410 | return -ENOMEM; | |
411 | ||
a6f1e036 | 412 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
76253e73 DW |
413 | be32toh(req->message->xid), type, ARPHRD_ETHER, |
414 | req->max_optlen, &optoffset); | |
4dc35568 TG |
415 | if (r < 0) |
416 | return r; | |
417 | ||
418 | packet->dhcp.flags = req->message->flags; | |
419 | packet->dhcp.giaddr = req->message->giaddr; | |
420 | memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN); | |
421 | ||
422 | *_optoffset = optoffset; | |
1cc6c93a | 423 | *ret = TAKE_PTR(packet); |
4dc35568 TG |
424 | |
425 | return 0; | |
426 | } | |
427 | ||
a6f1e036 TG |
428 | static int server_send_offer(sd_dhcp_server *server, DHCPRequest *req, |
429 | be32_t address) { | |
4dc35568 TG |
430 | _cleanup_free_ DHCPPacket *packet = NULL; |
431 | size_t offset; | |
432 | be32_t lease_time; | |
433 | int r; | |
434 | ||
435 | r = server_message_init(server, &packet, DHCP_OFFER, &offset, req); | |
436 | if (r < 0) | |
437 | return r; | |
438 | ||
2dead812 | 439 | packet->dhcp.yiaddr = address; |
4dc35568 | 440 | |
c7d9ffe6 | 441 | lease_time = htobe32(req->lifetime); |
4dc35568 | 442 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 443 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 444 | &lease_time); |
4dc35568 TG |
445 | if (r < 0) |
446 | return r; | |
447 | ||
59b8f6b6 | 448 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 449 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
450 | if (r < 0) |
451 | return r; | |
452 | ||
77ff6022 CG |
453 | if (server->emit_router) { |
454 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
455 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
456 | if (r < 0) | |
457 | return r; | |
458 | } | |
59b8f6b6 | 459 | |
4dc35568 TG |
460 | r = dhcp_server_send_packet(server, req, packet, DHCP_OFFER, offset); |
461 | if (r < 0) | |
462 | return r; | |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
ddb82ec2 LP |
467 | static int server_send_ack( |
468 | sd_dhcp_server *server, | |
469 | DHCPRequest *req, | |
470 | be32_t address) { | |
471 | ||
472 | static const uint8_t option_map[_SD_DHCP_LEASE_SERVER_TYPE_MAX] = { | |
473 | [SD_DHCP_LEASE_DNS] = SD_DHCP_OPTION_DOMAIN_NAME_SERVER, | |
474 | [SD_DHCP_LEASE_NTP] = SD_DHCP_OPTION_NTP_SERVER, | |
475 | [SD_DHCP_LEASE_SIP] = SD_DHCP_OPTION_SIP_SERVER, | |
476 | [SD_DHCP_LEASE_POP3] = SD_DHCP_OPTION_POP3_SERVER, | |
477 | [SD_DHCP_LEASE_SMTP] = SD_DHCP_OPTION_SMTP_SERVER, | |
478 | [SD_DHCP_LEASE_LPR] = SD_DHCP_OPTION_LPR_SERVER, | |
479 | }; | |
480 | ||
2dead812 | 481 | _cleanup_free_ DHCPPacket *packet = NULL; |
2dead812 | 482 | be32_t lease_time; |
7354900d | 483 | sd_dhcp_option *j; |
564ca984 | 484 | size_t offset; |
2dead812 TG |
485 | int r; |
486 | ||
487 | r = server_message_init(server, &packet, DHCP_ACK, &offset, req); | |
488 | if (r < 0) | |
489 | return r; | |
490 | ||
491 | packet->dhcp.yiaddr = address; | |
492 | ||
c7d9ffe6 | 493 | lease_time = htobe32(req->lifetime); |
2dead812 | 494 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 495 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 496 | &lease_time); |
2dead812 TG |
497 | if (r < 0) |
498 | return r; | |
499 | ||
59b8f6b6 | 500 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 501 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
502 | if (r < 0) |
503 | return r; | |
504 | ||
77ff6022 CG |
505 | if (server->emit_router) { |
506 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
507 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
508 | if (r < 0) | |
509 | return r; | |
510 | } | |
59b8f6b6 | 511 | |
ddb82ec2 | 512 | for (sd_dhcp_lease_server_type k = 0; k < _SD_DHCP_LEASE_SERVER_TYPE_MAX; k++) { |
299d578f | 513 | |
ddb82ec2 LP |
514 | if (server->servers[k].size <= 0) |
515 | continue; | |
f678ac7e | 516 | |
2c649ca1 SS |
517 | r = dhcp_option_append( |
518 | &packet->dhcp, req->max_optlen, &offset, 0, | |
ddb82ec2 LP |
519 | option_map[k], |
520 | sizeof(struct in_addr) * server->servers[k].size, server->servers[k].addr); | |
2c649ca1 SS |
521 | if (r < 0) |
522 | return r; | |
523 | } | |
524 | ||
50018bfa | 525 | |
8eb9058d LP |
526 | if (server->timezone) { |
527 | r = dhcp_option_append( | |
528 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 529 | SD_DHCP_OPTION_NEW_TZDB_TIMEZONE, |
8eb9058d LP |
530 | strlen(server->timezone), server->timezone); |
531 | if (r < 0) | |
532 | return r; | |
533 | } | |
534 | ||
ebffea2a | 535 | ORDERED_SET_FOREACH(j, server->extra_options) { |
7354900d DW |
536 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
537 | j->option, j->length, j->data); | |
538 | if (r < 0) | |
539 | return r; | |
540 | } | |
541 | ||
ebffea2a | 542 | if (!ordered_set_isempty(server->vendor_options)) { |
564ca984 SS |
543 | r = dhcp_option_append( |
544 | &packet->dhcp, req->max_optlen, &offset, 0, | |
545 | SD_DHCP_OPTION_VENDOR_SPECIFIC, | |
ebffea2a | 546 | ordered_set_size(server->vendor_options), server->vendor_options); |
564ca984 SS |
547 | if (r < 0) |
548 | return r; | |
549 | } | |
550 | ||
2dead812 TG |
551 | r = dhcp_server_send_packet(server, req, packet, DHCP_ACK, offset); |
552 | if (r < 0) | |
553 | return r; | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
bd57b450 TG |
558 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { |
559 | _cleanup_free_ DHCPPacket *packet = NULL; | |
560 | size_t offset; | |
561 | int r; | |
562 | ||
563 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); | |
564 | if (r < 0) | |
565 | return r; | |
566 | ||
b3ec603c | 567 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
bd57b450 TG |
568 | } |
569 | ||
a6f1e036 | 570 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
141261f1 | 571 | be32_t gateway, const uint8_t chaddr[]) { |
52750344 TG |
572 | _cleanup_free_ DHCPPacket *packet = NULL; |
573 | size_t optoffset = 0; | |
574 | int r; | |
575 | ||
576 | assert(server); | |
577 | assert(address != INADDR_ANY); | |
578 | assert(chaddr); | |
579 | ||
580 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
581 | if (!packet) | |
582 | return -ENOMEM; | |
583 | ||
584 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
76253e73 DW |
585 | DHCP_FORCERENEW, ARPHRD_ETHER, |
586 | DHCP_MIN_OPTIONS_SIZE, &optoffset); | |
52750344 TG |
587 | if (r < 0) |
588 | return r; | |
589 | ||
590 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
22805d92 | 591 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL); |
52750344 TG |
592 | if (r < 0) |
593 | return r; | |
594 | ||
595 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); | |
596 | ||
8eb7b6a5 PF |
597 | r = dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, |
598 | &packet->dhcp, | |
52750344 | 599 | sizeof(DHCPMessage) + optoffset); |
c15fb62a TA |
600 | if (r < 0) |
601 | return r; | |
52750344 TG |
602 | |
603 | return 0; | |
604 | } | |
605 | ||
b3ec603c | 606 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
89ca10c6 | 607 | DHCPRequest *req = userdata; |
816e2e7a TG |
608 | |
609 | assert(req); | |
610 | ||
611 | switch(code) { | |
22805d92 | 612 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
c7d9ffe6 | 613 | if (len == 4) |
9ae84244 | 614 | req->lifetime = unaligned_read_be32(option); |
c7d9ffe6 TG |
615 | |
616 | break; | |
22805d92 | 617 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
2dead812 | 618 | if (len == 4) |
9ae84244 | 619 | memcpy(&req->requested_ip, option, sizeof(be32_t)); |
2dead812 TG |
620 | |
621 | break; | |
22805d92 | 622 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
816e2e7a | 623 | if (len == 4) |
9ae84244 | 624 | memcpy(&req->server_id, option, sizeof(be32_t)); |
816e2e7a TG |
625 | |
626 | break; | |
22805d92 | 627 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
816e2e7a TG |
628 | if (len >= 2) { |
629 | uint8_t *data; | |
630 | ||
631 | data = memdup(option, len); | |
632 | if (!data) | |
633 | return -ENOMEM; | |
634 | ||
635 | free(req->client_id.data); | |
636 | req->client_id.data = data; | |
637 | req->client_id.length = len; | |
638 | } | |
639 | ||
640 | break; | |
22805d92 | 641 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
76a9d0f1 LP |
642 | |
643 | if (len == 2 && unaligned_read_be16(option) >= sizeof(DHCPPacket)) | |
9ae84244 | 644 | req->max_optlen = unaligned_read_be16(option) - sizeof(DHCPPacket); |
816e2e7a TG |
645 | |
646 | break; | |
647 | } | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
75db809a | 652 | static DHCPRequest* dhcp_request_free(DHCPRequest *req) { |
816e2e7a | 653 | if (!req) |
75db809a | 654 | return NULL; |
816e2e7a TG |
655 | |
656 | free(req->client_id.data); | |
75db809a | 657 | return mfree(req); |
816e2e7a TG |
658 | } |
659 | ||
660 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
816e2e7a | 661 | |
586ac6f7 | 662 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
816e2e7a TG |
663 | assert(req); |
664 | assert(message); | |
665 | ||
666 | req->message = message; | |
667 | ||
e2acdb6b | 668 | /* set client id based on MAC address if client did not send an explicit |
a6f1e036 | 669 | one */ |
816e2e7a | 670 | if (!req->client_id.data) { |
9a0f246f | 671 | void *data; |
816e2e7a | 672 | |
9a0f246f | 673 | data = malloc0(ETH_ALEN + 1); |
816e2e7a TG |
674 | if (!data) |
675 | return -ENOMEM; | |
676 | ||
9a0f246f LP |
677 | ((uint8_t*) data)[0] = 0x01; |
678 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN); | |
679 | ||
816e2e7a TG |
680 | req->client_id.length = ETH_ALEN + 1; |
681 | req->client_id.data = data; | |
816e2e7a TG |
682 | } |
683 | ||
684 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) | |
685 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
686 | ||
9a0f246f | 687 | if (req->lifetime <= 0) |
586ac6f7 LP |
688 | req->lifetime = MAX(1ULL, server->default_lease_time); |
689 | ||
690 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
691 | req->lifetime = server->max_lease_time; | |
c7d9ffe6 | 692 | |
816e2e7a TG |
693 | return 0; |
694 | } | |
695 | ||
87322b3a TG |
696 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { |
697 | assert(server); | |
698 | ||
699 | if (!server->pool_size) | |
700 | return -EINVAL; | |
701 | ||
99634696 TG |
702 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
703 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
704 | return -ERANGE; | |
87322b3a | 705 | |
99634696 | 706 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
87322b3a TG |
707 | } |
708 | ||
83cedf7a TG |
709 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
710 | ||
be077570 TG |
711 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, |
712 | size_t length) { | |
8e766630 | 713 | _cleanup_(dhcp_request_freep) DHCPRequest *req = NULL; |
f693e9b3 | 714 | _cleanup_free_ char *error_message = NULL; |
87322b3a | 715 | DHCPLease *existing_lease; |
816e2e7a | 716 | int type, r; |
be077570 TG |
717 | |
718 | assert(server); | |
719 | assert(message); | |
720 | ||
721 | if (message->op != BOOTREQUEST || | |
722 | message->htype != ARPHRD_ETHER || | |
723 | message->hlen != ETHER_ADDR_LEN) | |
724 | return 0; | |
725 | ||
816e2e7a TG |
726 | req = new0(DHCPRequest, 1); |
727 | if (!req) | |
728 | return -ENOMEM; | |
729 | ||
f693e9b3 | 730 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
be077570 TG |
731 | if (type < 0) |
732 | return 0; | |
733 | ||
586ac6f7 | 734 | r = ensure_sane_request(server, req, message); |
816e2e7a TG |
735 | if (r < 0) |
736 | /* this only fails on critical errors */ | |
737 | return r; | |
738 | ||
a6f1e036 TG |
739 | existing_lease = hashmap_get(server->leases_by_client_id, |
740 | &req->client_id); | |
87322b3a | 741 | |
4dc35568 | 742 | switch(type) { |
9a0f246f LP |
743 | |
744 | case DHCP_DISCOVER: { | |
87322b3a TG |
745 | be32_t address = INADDR_ANY; |
746 | unsigned i; | |
2dead812 | 747 | |
4dc35568 TG |
748 | log_dhcp_server(server, "DISCOVER (0x%x)", |
749 | be32toh(req->message->xid)); | |
750 | ||
2dead812 TG |
751 | if (!server->pool_size) |
752 | /* no pool allocated */ | |
753 | return 0; | |
754 | ||
87322b3a TG |
755 | /* for now pick a random free address from the pool */ |
756 | if (existing_lease) | |
757 | address = existing_lease->address; | |
758 | else { | |
b826ab58 | 759 | struct siphash state; |
0cb3c286 | 760 | uint64_t hash; |
99634696 | 761 | uint32_t next_offer; |
83cedf7a TG |
762 | |
763 | /* even with no persistence of leases, we try to offer the same client | |
764 | the same IP address. we do this by using the hash of the client id | |
765 | as the offset into the pool of leases when finding the next free one */ | |
766 | ||
0cb3c286 | 767 | siphash24_init(&state, HASH_KEY.bytes); |
b826ab58 | 768 | client_id_hash_func(&req->client_id, &state); |
933f9cae | 769 | hash = htole64(siphash24_finalize(&state)); |
0cb3c286 | 770 | next_offer = hash % server->pool_size; |
83cedf7a | 771 | |
87322b3a | 772 | for (i = 0; i < server->pool_size; i++) { |
83cedf7a | 773 | if (!server->bound_leases[next_offer]) { |
99634696 | 774 | address = server->subnet | htobe32(server->pool_offset + next_offer); |
87322b3a | 775 | break; |
6408ba5f LP |
776 | } |
777 | ||
778 | next_offer = (next_offer + 1) % server->pool_size; | |
87322b3a TG |
779 | } |
780 | } | |
781 | ||
782 | if (address == INADDR_ANY) | |
783 | /* no free addresses left */ | |
784 | return 0; | |
2dead812 TG |
785 | |
786 | r = server_send_offer(server, req, address); | |
6e741541 | 787 | if (r < 0) |
4dc35568 | 788 | /* this only fails on critical errors */ |
6e741541 | 789 | return log_dhcp_server_errno(server, r, "Could not send offer: %m"); |
be077570 | 790 | |
6e741541 LP |
791 | log_dhcp_server(server, "OFFER (0x%x)", be32toh(req->message->xid)); |
792 | return DHCP_OFFER; | |
4dc35568 | 793 | } |
5b34277c | 794 | case DHCP_DECLINE: |
f693e9b3 | 795 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message)); |
5b34277c TG |
796 | |
797 | /* TODO: make sure we don't offer this address again */ | |
798 | ||
799 | return 1; | |
800 | ||
9a0f246f | 801 | case DHCP_REQUEST: { |
2dead812 | 802 | be32_t address; |
bd57b450 | 803 | bool init_reboot = false; |
87322b3a | 804 | int pool_offset; |
2dead812 TG |
805 | |
806 | /* see RFC 2131, section 4.3.2 */ | |
807 | ||
808 | if (req->server_id) { | |
809 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", | |
810 | be32toh(req->message->xid)); | |
811 | ||
812 | /* SELECTING */ | |
813 | if (req->server_id != server->address) | |
814 | /* client did not pick us */ | |
815 | return 0; | |
816 | ||
817 | if (req->message->ciaddr) | |
818 | /* this MUST be zero */ | |
819 | return 0; | |
820 | ||
821 | if (!req->requested_ip) | |
822 | /* this must be filled in with the yiaddr | |
823 | from the chosen OFFER */ | |
824 | return 0; | |
825 | ||
826 | address = req->requested_ip; | |
827 | } else if (req->requested_ip) { | |
828 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", | |
829 | be32toh(req->message->xid)); | |
830 | ||
831 | /* INIT-REBOOT */ | |
832 | if (req->message->ciaddr) | |
833 | /* this MUST be zero */ | |
834 | return 0; | |
835 | ||
bd57b450 | 836 | /* TODO: check more carefully if IP is correct */ |
2dead812 | 837 | address = req->requested_ip; |
bd57b450 | 838 | init_reboot = true; |
2dead812 TG |
839 | } else { |
840 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
841 | be32toh(req->message->xid)); | |
842 | ||
843 | /* REBINDING / RENEWING */ | |
844 | if (!req->message->ciaddr) | |
845 | /* this MUST be filled in with clients IP address */ | |
846 | return 0; | |
847 | ||
848 | address = req->message->ciaddr; | |
849 | } | |
850 | ||
87322b3a TG |
851 | pool_offset = get_pool_offset(server, address); |
852 | ||
853 | /* verify that the requested address is from the pool, and either | |
854 | owned by the current client or free */ | |
855 | if (pool_offset >= 0 && | |
856 | server->bound_leases[pool_offset] == existing_lease) { | |
857 | DHCPLease *lease; | |
a7f7d1bd | 858 | usec_t time_now = 0; |
87322b3a TG |
859 | |
860 | if (!existing_lease) { | |
861 | lease = new0(DHCPLease, 1); | |
357e1b17 LP |
862 | if (!lease) |
863 | return -ENOMEM; | |
28c78e07 | 864 | lease->address = address; |
87322b3a TG |
865 | lease->client_id.data = memdup(req->client_id.data, |
866 | req->client_id.length); | |
02557f97 TA |
867 | if (!lease->client_id.data) { |
868 | free(lease); | |
87322b3a | 869 | return -ENOMEM; |
02557f97 | 870 | } |
87322b3a | 871 | lease->client_id.length = req->client_id.length; |
a6f1e036 TG |
872 | memcpy(&lease->chaddr, &req->message->chaddr, |
873 | ETH_ALEN); | |
52750344 | 874 | lease->gateway = req->message->giaddr; |
87322b3a TG |
875 | } else |
876 | lease = existing_lease; | |
877 | ||
a6f1e036 TG |
878 | r = sd_event_now(server->event, |
879 | clock_boottime_or_monotonic(), | |
880 | &time_now); | |
bff92d2c SS |
881 | if (r < 0) { |
882 | if (!existing_lease) | |
883 | dhcp_lease_free(lease); | |
38a03f06 | 884 | return r; |
bff92d2c SS |
885 | } |
886 | ||
87322b3a TG |
887 | lease->expiration = req->lifetime * USEC_PER_SEC + time_now; |
888 | ||
2dead812 TG |
889 | r = server_send_ack(server, req, address); |
890 | if (r < 0) { | |
891 | /* this only fails on critical errors */ | |
6e741541 | 892 | log_dhcp_server_errno(server, r, "Could not send ack: %m"); |
87322b3a TG |
893 | |
894 | if (!existing_lease) | |
895 | dhcp_lease_free(lease); | |
896 | ||
2dead812 TG |
897 | return r; |
898 | } else { | |
899 | log_dhcp_server(server, "ACK (0x%x)", | |
900 | be32toh(req->message->xid)); | |
87322b3a TG |
901 | |
902 | server->bound_leases[pool_offset] = lease; | |
a6f1e036 TG |
903 | hashmap_put(server->leases_by_client_id, |
904 | &lease->client_id, lease); | |
87322b3a | 905 | |
36d35f22 MAL |
906 | if (server->callback) |
907 | server->callback(server, SD_DHCP_SERVER_EVENT_LEASE_CHANGED, server->callback_userdata); | |
908 | ||
2dead812 TG |
909 | return DHCP_ACK; |
910 | } | |
6e741541 | 911 | |
bd57b450 TG |
912 | } else if (init_reboot) { |
913 | r = server_send_nak(server, req); | |
6e741541 | 914 | if (r < 0) |
bd57b450 | 915 | /* this only fails on critical errors */ |
6e741541 LP |
916 | return log_dhcp_server_errno(server, r, "Could not send nak: %m"); |
917 | ||
918 | log_dhcp_server(server, "NAK (0x%x)", be32toh(req->message->xid)); | |
919 | return DHCP_NAK; | |
bd57b450 | 920 | } |
2dead812 TG |
921 | |
922 | break; | |
923 | } | |
9a0f246f | 924 | |
500792d8 TG |
925 | case DHCP_RELEASE: { |
926 | int pool_offset; | |
927 | ||
928 | log_dhcp_server(server, "RELEASE (0x%x)", | |
929 | be32toh(req->message->xid)); | |
930 | ||
931 | if (!existing_lease) | |
932 | return 0; | |
933 | ||
934 | if (existing_lease->address != req->message->ciaddr) | |
935 | return 0; | |
936 | ||
937 | pool_offset = get_pool_offset(server, req->message->ciaddr); | |
938 | if (pool_offset < 0) | |
939 | return 0; | |
940 | ||
941 | if (server->bound_leases[pool_offset] == existing_lease) { | |
942 | server->bound_leases[pool_offset] = NULL; | |
943 | hashmap_remove(server->leases_by_client_id, existing_lease); | |
944 | dhcp_lease_free(existing_lease); | |
36d35f22 MAL |
945 | |
946 | if (server->callback) | |
947 | server->callback(server, SD_DHCP_SERVER_EVENT_LEASE_CHANGED, server->callback_userdata); | |
c3922c0c | 948 | } |
500792d8 | 949 | |
c3922c0c LP |
950 | return 0; |
951 | }} | |
4dc35568 TG |
952 | |
953 | return 0; | |
be077570 TG |
954 | } |
955 | ||
ff734080 TG |
956 | static int server_receive_message(sd_event_source *s, int fd, |
957 | uint32_t revents, void *userdata) { | |
be077570 | 958 | _cleanup_free_ DHCPMessage *message = NULL; |
fb29cdbe | 959 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in_pktinfo))) control; |
ff734080 TG |
960 | sd_dhcp_server *server = userdata; |
961 | struct iovec iov = {}; | |
962 | struct msghdr msg = { | |
963 | .msg_iov = &iov, | |
964 | .msg_iovlen = 1, | |
fb29cdbe LP |
965 | .msg_control = &control, |
966 | .msg_controllen = sizeof(control), | |
ff734080 | 967 | }; |
3a864fe4 | 968 | struct cmsghdr *cmsg; |
4edc2c9b | 969 | ssize_t buflen, len; |
57027d03 | 970 | int r; |
ff734080 TG |
971 | |
972 | assert(server); | |
973 | ||
4edc2c9b LP |
974 | buflen = next_datagram_size_fd(fd); |
975 | if (buflen < 0) | |
976 | return buflen; | |
ff734080 | 977 | |
0d43d2fc | 978 | message = malloc(buflen); |
ff734080 TG |
979 | if (!message) |
980 | return -ENOMEM; | |
981 | ||
cb310866 | 982 | iov = IOVEC_MAKE(message, buflen); |
ff734080 | 983 | |
2efa5bc6 LP |
984 | len = recvmsg_safe(fd, &msg, 0); |
985 | if (IN_SET(len, -EAGAIN, -EINTR)) | |
986 | return 0; | |
987 | if (len < 0) | |
988 | return len; | |
989 | if ((size_t) len < sizeof(DHCPMessage)) | |
be077570 | 990 | return 0; |
ff734080 | 991 | |
2a1288ff | 992 | CMSG_FOREACH(cmsg, &msg) { |
3a864fe4 TG |
993 | if (cmsg->cmsg_level == IPPROTO_IP && |
994 | cmsg->cmsg_type == IP_PKTINFO && | |
995 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) { | |
996 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg); | |
997 | ||
a6f1e036 TG |
998 | /* TODO figure out if this can be done as a filter on |
999 | * the socket, like for IPv6 */ | |
b3ec603c | 1000 | if (server->ifindex != info->ipi_ifindex) |
3a864fe4 TG |
1001 | return 0; |
1002 | ||
1003 | break; | |
1004 | } | |
1005 | } | |
1006 | ||
57027d03 LP |
1007 | r = dhcp_server_handle_message(server, message, (size_t) len); |
1008 | if (r < 0) | |
1009 | log_dhcp_server_errno(server, r, "Couldn't process incoming message: %m"); | |
1010 | ||
1011 | return 0; | |
ff734080 TG |
1012 | } |
1013 | ||
1014 | int sd_dhcp_server_start(sd_dhcp_server *server) { | |
1015 | int r; | |
1016 | ||
1017 | assert_return(server, -EINVAL); | |
1018 | assert_return(server->event, -EINVAL); | |
1019 | assert_return(!server->receive_message, -EBUSY); | |
cfcbb135 LP |
1020 | assert_return(server->fd_raw < 0, -EBUSY); |
1021 | assert_return(server->fd < 0, -EBUSY); | |
20af7091 | 1022 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH); |
ff734080 | 1023 | |
3e29b889 | 1024 | r = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0); |
8de4a226 TG |
1025 | if (r < 0) { |
1026 | r = -errno; | |
1027 | sd_dhcp_server_stop(server); | |
1028 | return r; | |
1029 | } | |
1030 | server->fd_raw = r; | |
1031 | ||
afe42aef | 1032 | r = dhcp_network_bind_udp_socket(server->ifindex, INADDR_ANY, DHCP_PORT_SERVER, -1); |
ff734080 TG |
1033 | if (r < 0) { |
1034 | sd_dhcp_server_stop(server); | |
1035 | return r; | |
1036 | } | |
1037 | server->fd = r; | |
1038 | ||
1039 | r = sd_event_add_io(server->event, &server->receive_message, | |
1040 | server->fd, EPOLLIN, | |
1041 | server_receive_message, server); | |
1042 | if (r < 0) { | |
1043 | sd_dhcp_server_stop(server); | |
1044 | return r; | |
1045 | } | |
1046 | ||
1047 | r = sd_event_source_set_priority(server->receive_message, | |
1048 | server->event_priority); | |
1049 | if (r < 0) { | |
1050 | sd_dhcp_server_stop(server); | |
1051 | return r; | |
1052 | } | |
1053 | ||
1054 | log_dhcp_server(server, "STARTED"); | |
1055 | ||
1056 | return 0; | |
1057 | } | |
52750344 TG |
1058 | |
1059 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { | |
621ac3d2 | 1060 | int r = 0; |
52750344 TG |
1061 | |
1062 | assert_return(server, -EINVAL); | |
1063 | assert(server->bound_leases); | |
1064 | ||
fe96c0f8 | 1065 | for (uint32_t i = 0; i < server->pool_size; i++) { |
52750344 TG |
1066 | DHCPLease *lease = server->bound_leases[i]; |
1067 | ||
99634696 | 1068 | if (!lease || lease == &server->invalid_lease) |
52750344 TG |
1069 | continue; |
1070 | ||
1071 | r = server_send_forcerenew(server, lease->address, | |
1072 | lease->gateway, | |
1073 | lease->chaddr); | |
1074 | if (r < 0) | |
1075 | return r; | |
6408ba5f LP |
1076 | |
1077 | log_dhcp_server(server, "FORCERENEW"); | |
52750344 TG |
1078 | } |
1079 | ||
1080 | return r; | |
1081 | } | |
8eb9058d | 1082 | |
64d6c229 | 1083 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { |
8eb9058d LP |
1084 | int r; |
1085 | ||
1086 | assert_return(server, -EINVAL); | |
089fb865 | 1087 | assert_return(timezone_is_valid(tz, LOG_DEBUG), -EINVAL); |
8eb9058d | 1088 | |
64d6c229 | 1089 | if (streq_ptr(tz, server->timezone)) |
8eb9058d LP |
1090 | return 0; |
1091 | ||
64d6c229 | 1092 | r = free_and_strdup(&server->timezone, tz); |
8eb9058d LP |
1093 | if (r < 0) |
1094 | return r; | |
1095 | ||
1096 | return 1; | |
1097 | } | |
586ac6f7 LP |
1098 | |
1099 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1100 | assert_return(server, -EINVAL); | |
1101 | ||
1102 | if (t == server->max_lease_time) | |
1103 | return 0; | |
1104 | ||
1105 | server->max_lease_time = t; | |
1106 | return 1; | |
1107 | } | |
1108 | ||
1109 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1110 | assert_return(server, -EINVAL); | |
1111 | ||
1112 | if (t == server->default_lease_time) | |
1113 | return 0; | |
1114 | ||
1115 | server->default_lease_time = t; | |
1116 | return 1; | |
1117 | } | |
1a04db0f | 1118 | |
c8407baf ZJS |
1119 | int sd_dhcp_server_set_servers( |
1120 | sd_dhcp_server *server, | |
ddb82ec2 | 1121 | sd_dhcp_lease_server_type what, |
c8407baf | 1122 | const struct in_addr addresses[], |
90810f7a | 1123 | size_t n_addresses) { |
1a04db0f | 1124 | |
ddb82ec2 LP |
1125 | struct in_addr *c = NULL; |
1126 | ||
1a04db0f | 1127 | assert_return(server, -EINVAL); |
c8407baf | 1128 | assert_return(addresses || n_addresses == 0, -EINVAL); |
ddb82ec2 LP |
1129 | assert_return(what >= 0, -EINVAL); |
1130 | assert_return(what < _SD_DHCP_LEASE_SERVER_TYPE_MAX, -EINVAL); | |
1a04db0f | 1131 | |
ddb82ec2 LP |
1132 | if (server->servers[what].size == n_addresses && |
1133 | memcmp(server->servers[what].addr, addresses, sizeof(struct in_addr) * n_addresses) == 0) | |
f678ac7e SS |
1134 | return 0; |
1135 | ||
c8407baf ZJS |
1136 | if (n_addresses > 0) { |
1137 | c = newdup(struct in_addr, addresses, n_addresses); | |
f678ac7e SS |
1138 | if (!c) |
1139 | return -ENOMEM; | |
f678ac7e SS |
1140 | } |
1141 | ||
ddb82ec2 LP |
1142 | free(server->servers[what].addr); |
1143 | server->servers[what].addr = c; | |
1144 | server->servers[what].size = n_addresses; | |
f678ac7e SS |
1145 | return 1; |
1146 | } | |
1147 | ||
90810f7a | 1148 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], size_t n) { |
ddb82ec2 | 1149 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_DNS, dns, n); |
c8407baf | 1150 | } |
90810f7a | 1151 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], size_t n) { |
ddb82ec2 | 1152 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_NTP, ntp, n); |
c8407baf | 1153 | } |
90810f7a | 1154 | int sd_dhcp_server_set_sip(sd_dhcp_server *server, const struct in_addr sip[], size_t n) { |
ddb82ec2 | 1155 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_SIP, sip, n); |
c8407baf | 1156 | } |
90810f7a | 1157 | int sd_dhcp_server_set_pop3(sd_dhcp_server *server, const struct in_addr pop3[], size_t n) { |
ddb82ec2 | 1158 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_POP3, pop3, n); |
c8407baf | 1159 | } |
90810f7a | 1160 | int sd_dhcp_server_set_smtp(sd_dhcp_server *server, const struct in_addr smtp[], size_t n) { |
ddb82ec2 | 1161 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_SMTP, smtp, n); |
2c649ca1 | 1162 | } |
90810f7a | 1163 | int sd_dhcp_server_set_lpr(sd_dhcp_server *server, const struct in_addr lpr[], size_t n) { |
ddb82ec2 | 1164 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_LPR, lpr, n); |
50018bfa | 1165 | } |
2c649ca1 | 1166 | |
77ff6022 CG |
1167 | int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled) { |
1168 | assert_return(server, -EINVAL); | |
1169 | ||
1170 | if (enabled == server->emit_router) | |
1171 | return 0; | |
1172 | ||
1173 | server->emit_router = enabled; | |
1174 | ||
1175 | return 1; | |
1176 | } | |
564ca984 | 1177 | |
461dbb2f | 1178 | int sd_dhcp_server_add_option(sd_dhcp_server *server, sd_dhcp_option *v) { |
564ca984 SS |
1179 | int r; |
1180 | ||
1181 | assert_return(server, -EINVAL); | |
1182 | assert_return(v, -EINVAL); | |
1183 | ||
ebffea2a | 1184 | r = ordered_set_ensure_put(&server->extra_options, &dhcp_option_hash_ops, v); |
7354900d DW |
1185 | if (r < 0) |
1186 | return r; | |
1187 | ||
1188 | sd_dhcp_option_ref(v); | |
1189 | return 0; | |
1190 | } | |
1191 | ||
1192 | int sd_dhcp_server_add_vendor_option(sd_dhcp_server *server, sd_dhcp_option *v) { | |
1193 | int r; | |
1194 | ||
1195 | assert_return(server, -EINVAL); | |
1196 | assert_return(v, -EINVAL); | |
1197 | ||
ebffea2a | 1198 | r = ordered_set_ensure_put(&server->vendor_options, &dhcp_option_hash_ops, v); |
564ca984 SS |
1199 | if (r < 0) |
1200 | return r; | |
1201 | ||
461dbb2f | 1202 | sd_dhcp_option_ref(v); |
564ca984 SS |
1203 | |
1204 | return 1; | |
1205 | } | |
5b03043a MAL |
1206 | |
1207 | int sd_dhcp_server_set_callback(sd_dhcp_server *server, sd_dhcp_server_callback_t cb, void *userdata) { | |
1208 | assert_return(server, -EINVAL); | |
1209 | ||
1210 | server->callback = cb; | |
1211 | server->callback_userdata = userdata; | |
1212 | ||
1213 | return 0; | |
1214 | } |