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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); |
f678ac7e | 143 | free(server->pop3_server); |
2c649ca1 | 144 | free(server->smtp_server); |
8eb9058d | 145 | |
3bdace9b LP |
146 | hashmap_free(server->leases_by_client_id); |
147 | ||
7354900d DW |
148 | ordered_hashmap_free(server->extra_options); |
149 | ordered_hashmap_free(server->vendor_options); | |
564ca984 | 150 | |
3bdace9b | 151 | free(server->bound_leases); |
6b430fdb | 152 | return mfree(server); |
b44cd882 TG |
153 | } |
154 | ||
8301aa0b YW |
155 | DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_server, sd_dhcp_server, dhcp_server_free); |
156 | ||
3a864fe4 | 157 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
4afd3348 | 158 | _cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL; |
b44cd882 TG |
159 | |
160 | assert_return(ret, -EINVAL); | |
3a864fe4 | 161 | assert_return(ifindex > 0, -EINVAL); |
b44cd882 TG |
162 | |
163 | server = new0(sd_dhcp_server, 1); | |
164 | if (!server) | |
165 | return -ENOMEM; | |
166 | ||
3733eec3 | 167 | server->n_ref = 1; |
8de4a226 | 168 | server->fd_raw = -1; |
ff734080 | 169 | server->fd = -1; |
20af7091 | 170 | server->address = htobe32(INADDR_ANY); |
59b8f6b6 | 171 | server->netmask = htobe32(INADDR_ANY); |
b3ec603c | 172 | server->ifindex = ifindex; |
357e1b17 | 173 | |
6121fc30 | 174 | server->leases_by_client_id = hashmap_new(&dhcp_lease_hash_ops); |
357e1b17 LP |
175 | if (!server->leases_by_client_id) |
176 | return -ENOMEM; | |
177 | ||
586ac6f7 LP |
178 | server->default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC); |
179 | server->max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC); | |
b44cd882 | 180 | |
1cc6c93a | 181 | *ret = TAKE_PTR(server); |
b44cd882 TG |
182 | |
183 | return 0; | |
184 | } | |
185 | ||
32d20645 | 186 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int64_t priority) { |
b44cd882 TG |
187 | int r; |
188 | ||
189 | assert_return(server, -EINVAL); | |
190 | assert_return(!server->event, -EBUSY); | |
191 | ||
192 | if (event) | |
193 | server->event = sd_event_ref(event); | |
194 | else { | |
195 | r = sd_event_default(&server->event); | |
196 | if (r < 0) | |
197 | return r; | |
198 | } | |
199 | ||
200 | server->event_priority = priority; | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
206 | assert_return(server, -EINVAL); | |
207 | ||
208 | server->event = sd_event_unref(server->event); | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
214 | assert_return(server, NULL); | |
215 | ||
216 | return server->event; | |
217 | } | |
ff734080 TG |
218 | |
219 | int sd_dhcp_server_stop(sd_dhcp_server *server) { | |
220 | assert_return(server, -EINVAL); | |
221 | ||
222 | server->receive_message = | |
223 | sd_event_source_unref(server->receive_message); | |
224 | ||
8de4a226 | 225 | server->fd_raw = safe_close(server->fd_raw); |
ff734080 TG |
226 | server->fd = safe_close(server->fd); |
227 | ||
228 | log_dhcp_server(server, "STOPPED"); | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
a6f1e036 TG |
233 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
234 | DHCPPacket *packet, size_t len) { | |
969b009d TG |
235 | union sockaddr_union link = { |
236 | .ll.sll_family = AF_PACKET, | |
8e38570e | 237 | .ll.sll_protocol = htobe16(ETH_P_IP), |
b3ec603c | 238 | .ll.sll_ifindex = server->ifindex, |
969b009d TG |
239 | .ll.sll_halen = ETH_ALEN, |
240 | }; | |
969b009d TG |
241 | |
242 | assert(server); | |
b3ec603c | 243 | assert(server->ifindex > 0); |
969b009d TG |
244 | assert(server->address); |
245 | assert(packet); | |
246 | assert(len > sizeof(DHCPPacket)); | |
247 | ||
248 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN); | |
249 | ||
250 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, | |
a6f1e036 | 251 | packet->dhcp.yiaddr, |
afe42aef | 252 | DHCP_PORT_CLIENT, len, -1); |
969b009d | 253 | |
b3ec603c | 254 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
969b009d TG |
255 | } |
256 | ||
257 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
8eb7b6a5 | 258 | uint16_t destination_port, |
969b009d TG |
259 | DHCPMessage *message, size_t len) { |
260 | union sockaddr_union dest = { | |
261 | .in.sin_family = AF_INET, | |
8eb7b6a5 | 262 | .in.sin_port = htobe16(destination_port), |
969b009d TG |
263 | .in.sin_addr.s_addr = destination, |
264 | }; | |
265 | struct iovec iov = { | |
266 | .iov_base = message, | |
267 | .iov_len = len, | |
268 | }; | |
269 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))] = {}; | |
270 | struct msghdr msg = { | |
271 | .msg_name = &dest, | |
272 | .msg_namelen = sizeof(dest.in), | |
273 | .msg_iov = &iov, | |
274 | .msg_iovlen = 1, | |
275 | .msg_control = cmsgbuf, | |
276 | .msg_controllen = sizeof(cmsgbuf), | |
277 | }; | |
278 | struct cmsghdr *cmsg; | |
279 | struct in_pktinfo *pktinfo; | |
969b009d TG |
280 | |
281 | assert(server); | |
4c9cb12c | 282 | assert(server->fd >= 0); |
969b009d TG |
283 | assert(message); |
284 | assert(len > sizeof(DHCPMessage)); | |
285 | ||
286 | cmsg = CMSG_FIRSTHDR(&msg); | |
287 | assert(cmsg); | |
288 | ||
289 | cmsg->cmsg_level = IPPROTO_IP; | |
290 | cmsg->cmsg_type = IP_PKTINFO; | |
291 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
292 | ||
293 | /* we attach source interface and address info to the message | |
294 | rather than binding the socket. This will be mostly useful | |
295 | when we gain support for arbitrary number of server addresses | |
296 | */ | |
297 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
298 | assert(pktinfo); | |
299 | ||
b3ec603c | 300 | pktinfo->ipi_ifindex = server->ifindex; |
969b009d TG |
301 | pktinfo->ipi_spec_dst.s_addr = server->address; |
302 | ||
0f01c1f9 | 303 | if (sendmsg(server->fd, &msg, 0) < 0) |
969b009d TG |
304 | return -errno; |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | static bool requested_broadcast(DHCPRequest *req) { | |
310 | assert(req); | |
311 | ||
312 | return req->message->flags & htobe16(0x8000); | |
313 | } | |
314 | ||
315 | int dhcp_server_send_packet(sd_dhcp_server *server, | |
316 | DHCPRequest *req, DHCPPacket *packet, | |
317 | int type, size_t optoffset) { | |
318 | be32_t destination = INADDR_ANY; | |
8eb7b6a5 | 319 | uint16_t destination_port = DHCP_PORT_CLIENT; |
969b009d TG |
320 | int r; |
321 | ||
322 | assert(server); | |
323 | assert(req); | |
324 | assert(req->max_optlen); | |
325 | assert(optoffset <= req->max_optlen); | |
326 | assert(packet); | |
327 | ||
328 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 329 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
969b009d TG |
330 | 4, &server->address); |
331 | if (r < 0) | |
332 | return r; | |
333 | ||
334 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 335 | SD_DHCP_OPTION_END, 0, NULL); |
969b009d TG |
336 | if (r < 0) |
337 | return r; | |
338 | ||
339 | /* RFC 2131 Section 4.1 | |
340 | ||
341 | If the ’giaddr’ field in a DHCP message from a client is non-zero, | |
342 | the server sends any return messages to the ’DHCP server’ port on the | |
343 | BOOTP relay agent whose address appears in ’giaddr’. If the ’giaddr’ | |
344 | field is zero and the ’ciaddr’ field is nonzero, then the server | |
345 | unicasts DHCPOFFER and DHCPACK messages to the address in ’ciaddr’. | |
346 | If ’giaddr’ is zero and ’ciaddr’ is zero, and the broadcast bit is | |
347 | set, then the server broadcasts DHCPOFFER and DHCPACK messages to | |
348 | 0xffffffff. If the broadcast bit is not set and ’giaddr’ is zero and | |
349 | ’ciaddr’ is zero, then the server unicasts DHCPOFFER and DHCPACK | |
350 | messages to the client’s hardware address and ’yiaddr’ address. In | |
351 | all cases, when ’giaddr’ is zero, the server broadcasts any DHCPNAK | |
352 | messages to 0xffffffff. | |
353 | ||
354 | Section 4.3.2 | |
355 | ||
356 | If ’giaddr’ is set in the DHCPREQUEST message, the client is on a | |
357 | different subnet. The server MUST set the broadcast bit in the | |
358 | DHCPNAK, so that the relay agent will broadcast the DHCPNAK to the | |
359 | client, because the client may not have a correct network address | |
360 | or subnet mask, and the client may not be answering ARP requests. | |
361 | */ | |
362 | if (req->message->giaddr) { | |
363 | destination = req->message->giaddr; | |
8eb7b6a5 | 364 | destination_port = DHCP_PORT_SERVER; |
969b009d TG |
365 | if (type == DHCP_NAK) |
366 | packet->dhcp.flags = htobe16(0x8000); | |
367 | } else if (req->message->ciaddr && type != DHCP_NAK) | |
368 | destination = req->message->ciaddr; | |
369 | ||
d6bd972d | 370 | if (destination != INADDR_ANY) |
8eb7b6a5 PF |
371 | return dhcp_server_send_udp(server, destination, |
372 | destination_port, &packet->dhcp, | |
969b009d | 373 | sizeof(DHCPMessage) + optoffset); |
d6bd972d | 374 | else if (requested_broadcast(req) || type == DHCP_NAK) |
a6f1e036 | 375 | return dhcp_server_send_udp(server, INADDR_BROADCAST, |
8eb7b6a5 | 376 | destination_port, &packet->dhcp, |
d6bd972d | 377 | sizeof(DHCPMessage) + optoffset); |
969b009d | 378 | else |
a6f1e036 TG |
379 | /* we cannot send UDP packet to specific MAC address when the |
380 | address is not yet configured, so must fall back to raw | |
381 | packets */ | |
969b009d TG |
382 | return dhcp_server_send_unicast_raw(server, packet, |
383 | sizeof(DHCPPacket) + optoffset); | |
384 | } | |
385 | ||
4dc35568 | 386 | static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret, |
a6f1e036 TG |
387 | uint8_t type, size_t *_optoffset, |
388 | DHCPRequest *req) { | |
4dc35568 | 389 | _cleanup_free_ DHCPPacket *packet = NULL; |
1231c4d2 | 390 | size_t optoffset = 0; |
4dc35568 TG |
391 | int r; |
392 | ||
393 | assert(server); | |
394 | assert(ret); | |
395 | assert(_optoffset); | |
bd57b450 | 396 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)); |
4dc35568 TG |
397 | |
398 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen); | |
399 | if (!packet) | |
400 | return -ENOMEM; | |
401 | ||
a6f1e036 | 402 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
76253e73 DW |
403 | be32toh(req->message->xid), type, ARPHRD_ETHER, |
404 | req->max_optlen, &optoffset); | |
4dc35568 TG |
405 | if (r < 0) |
406 | return r; | |
407 | ||
408 | packet->dhcp.flags = req->message->flags; | |
409 | packet->dhcp.giaddr = req->message->giaddr; | |
410 | memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN); | |
411 | ||
412 | *_optoffset = optoffset; | |
1cc6c93a | 413 | *ret = TAKE_PTR(packet); |
4dc35568 TG |
414 | |
415 | return 0; | |
416 | } | |
417 | ||
a6f1e036 TG |
418 | static int server_send_offer(sd_dhcp_server *server, DHCPRequest *req, |
419 | be32_t address) { | |
4dc35568 TG |
420 | _cleanup_free_ DHCPPacket *packet = NULL; |
421 | size_t offset; | |
422 | be32_t lease_time; | |
423 | int r; | |
424 | ||
425 | r = server_message_init(server, &packet, DHCP_OFFER, &offset, req); | |
426 | if (r < 0) | |
427 | return r; | |
428 | ||
2dead812 | 429 | packet->dhcp.yiaddr = address; |
4dc35568 | 430 | |
c7d9ffe6 | 431 | lease_time = htobe32(req->lifetime); |
4dc35568 | 432 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 433 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 434 | &lease_time); |
4dc35568 TG |
435 | if (r < 0) |
436 | return r; | |
437 | ||
59b8f6b6 | 438 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 439 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
440 | if (r < 0) |
441 | return r; | |
442 | ||
77ff6022 CG |
443 | if (server->emit_router) { |
444 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
445 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
446 | if (r < 0) | |
447 | return r; | |
448 | } | |
59b8f6b6 | 449 | |
4dc35568 TG |
450 | r = dhcp_server_send_packet(server, req, packet, DHCP_OFFER, offset); |
451 | if (r < 0) | |
452 | return r; | |
453 | ||
454 | return 0; | |
455 | } | |
456 | ||
a6f1e036 TG |
457 | static int server_send_ack(sd_dhcp_server *server, DHCPRequest *req, |
458 | be32_t address) { | |
2dead812 | 459 | _cleanup_free_ DHCPPacket *packet = NULL; |
2dead812 | 460 | be32_t lease_time; |
7354900d DW |
461 | sd_dhcp_option *j; |
462 | Iterator i; | |
564ca984 | 463 | size_t offset; |
2dead812 TG |
464 | int r; |
465 | ||
466 | r = server_message_init(server, &packet, DHCP_ACK, &offset, req); | |
467 | if (r < 0) | |
468 | return r; | |
469 | ||
470 | packet->dhcp.yiaddr = address; | |
471 | ||
c7d9ffe6 | 472 | lease_time = htobe32(req->lifetime); |
2dead812 | 473 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 474 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 475 | &lease_time); |
2dead812 TG |
476 | if (r < 0) |
477 | return r; | |
478 | ||
59b8f6b6 | 479 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 480 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
481 | if (r < 0) |
482 | return r; | |
483 | ||
77ff6022 CG |
484 | if (server->emit_router) { |
485 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
486 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
487 | if (r < 0) | |
488 | return r; | |
489 | } | |
59b8f6b6 | 490 | |
1a04db0f LP |
491 | if (server->n_dns > 0) { |
492 | r = dhcp_option_append( | |
493 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 494 | SD_DHCP_OPTION_DOMAIN_NAME_SERVER, |
1a04db0f LP |
495 | sizeof(struct in_addr) * server->n_dns, server->dns); |
496 | if (r < 0) | |
497 | return r; | |
498 | } | |
499 | ||
500 | if (server->n_ntp > 0) { | |
501 | r = dhcp_option_append( | |
502 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 503 | SD_DHCP_OPTION_NTP_SERVER, |
1a04db0f LP |
504 | sizeof(struct in_addr) * server->n_ntp, server->ntp); |
505 | if (r < 0) | |
506 | return r; | |
507 | } | |
508 | ||
299d578f SS |
509 | if (server->n_sip > 0) { |
510 | r = dhcp_option_append( | |
511 | &packet->dhcp, req->max_optlen, &offset, 0, | |
512 | SD_DHCP_OPTION_SIP_SERVER, | |
513 | sizeof(struct in_addr) * server->n_sip, server->sip); | |
514 | if (r < 0) | |
515 | return r; | |
516 | } | |
517 | ||
f678ac7e SS |
518 | if (server->n_pop3_server > 0) { |
519 | r = dhcp_option_append( | |
520 | &packet->dhcp, req->max_optlen, &offset, 0, | |
521 | SD_DHCP_OPTION_POP3_SERVER, | |
522 | sizeof(struct in_addr) * server->n_pop3_server, server->pop3_server); | |
523 | if (r < 0) | |
524 | return r; | |
525 | } | |
526 | ||
2c649ca1 SS |
527 | if (server->n_smtp_server > 0) { |
528 | r = dhcp_option_append( | |
529 | &packet->dhcp, req->max_optlen, &offset, 0, | |
530 | SD_DHCP_OPTION_SMTP_SERVER, | |
531 | sizeof(struct in_addr) * server->n_smtp_server, server->smtp_server); | |
532 | if (r < 0) | |
533 | return r; | |
534 | } | |
535 | ||
8eb9058d LP |
536 | if (server->timezone) { |
537 | r = dhcp_option_append( | |
538 | &packet->dhcp, req->max_optlen, &offset, 0, | |
22805d92 | 539 | SD_DHCP_OPTION_NEW_TZDB_TIMEZONE, |
8eb9058d LP |
540 | strlen(server->timezone), server->timezone); |
541 | if (r < 0) | |
542 | return r; | |
543 | } | |
544 | ||
7354900d DW |
545 | ORDERED_HASHMAP_FOREACH(j, server->extra_options, i) { |
546 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
547 | j->option, j->length, j->data); | |
548 | if (r < 0) | |
549 | return r; | |
550 | } | |
551 | ||
552 | if (!ordered_hashmap_isempty(server->vendor_options)) { | |
564ca984 SS |
553 | r = dhcp_option_append( |
554 | &packet->dhcp, req->max_optlen, &offset, 0, | |
555 | SD_DHCP_OPTION_VENDOR_SPECIFIC, | |
7354900d | 556 | ordered_hashmap_size(server->vendor_options), server->vendor_options); |
564ca984 SS |
557 | if (r < 0) |
558 | return r; | |
559 | } | |
560 | ||
2dead812 TG |
561 | r = dhcp_server_send_packet(server, req, packet, DHCP_ACK, offset); |
562 | if (r < 0) | |
563 | return r; | |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
bd57b450 TG |
568 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { |
569 | _cleanup_free_ DHCPPacket *packet = NULL; | |
570 | size_t offset; | |
571 | int r; | |
572 | ||
573 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); | |
574 | if (r < 0) | |
575 | return r; | |
576 | ||
b3ec603c | 577 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
bd57b450 TG |
578 | } |
579 | ||
a6f1e036 TG |
580 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
581 | be32_t gateway, uint8_t chaddr[]) { | |
52750344 TG |
582 | _cleanup_free_ DHCPPacket *packet = NULL; |
583 | size_t optoffset = 0; | |
584 | int r; | |
585 | ||
586 | assert(server); | |
587 | assert(address != INADDR_ANY); | |
588 | assert(chaddr); | |
589 | ||
590 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
591 | if (!packet) | |
592 | return -ENOMEM; | |
593 | ||
594 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
76253e73 DW |
595 | DHCP_FORCERENEW, ARPHRD_ETHER, |
596 | DHCP_MIN_OPTIONS_SIZE, &optoffset); | |
52750344 TG |
597 | if (r < 0) |
598 | return r; | |
599 | ||
600 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
22805d92 | 601 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL); |
52750344 TG |
602 | if (r < 0) |
603 | return r; | |
604 | ||
605 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); | |
606 | ||
8eb7b6a5 PF |
607 | r = dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, |
608 | &packet->dhcp, | |
52750344 | 609 | sizeof(DHCPMessage) + optoffset); |
c15fb62a TA |
610 | if (r < 0) |
611 | return r; | |
52750344 TG |
612 | |
613 | return 0; | |
614 | } | |
615 | ||
b3ec603c | 616 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
89ca10c6 | 617 | DHCPRequest *req = userdata; |
816e2e7a TG |
618 | |
619 | assert(req); | |
620 | ||
621 | switch(code) { | |
22805d92 | 622 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
c7d9ffe6 | 623 | if (len == 4) |
9ae84244 | 624 | req->lifetime = unaligned_read_be32(option); |
c7d9ffe6 TG |
625 | |
626 | break; | |
22805d92 | 627 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
2dead812 | 628 | if (len == 4) |
9ae84244 | 629 | memcpy(&req->requested_ip, option, sizeof(be32_t)); |
2dead812 TG |
630 | |
631 | break; | |
22805d92 | 632 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
816e2e7a | 633 | if (len == 4) |
9ae84244 | 634 | memcpy(&req->server_id, option, sizeof(be32_t)); |
816e2e7a TG |
635 | |
636 | break; | |
22805d92 | 637 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
816e2e7a TG |
638 | if (len >= 2) { |
639 | uint8_t *data; | |
640 | ||
641 | data = memdup(option, len); | |
642 | if (!data) | |
643 | return -ENOMEM; | |
644 | ||
645 | free(req->client_id.data); | |
646 | req->client_id.data = data; | |
647 | req->client_id.length = len; | |
648 | } | |
649 | ||
650 | break; | |
22805d92 | 651 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
76a9d0f1 LP |
652 | |
653 | if (len == 2 && unaligned_read_be16(option) >= sizeof(DHCPPacket)) | |
9ae84244 | 654 | req->max_optlen = unaligned_read_be16(option) - sizeof(DHCPPacket); |
816e2e7a TG |
655 | |
656 | break; | |
657 | } | |
658 | ||
659 | return 0; | |
660 | } | |
661 | ||
662 | static void dhcp_request_free(DHCPRequest *req) { | |
663 | if (!req) | |
664 | return; | |
665 | ||
666 | free(req->client_id.data); | |
667 | free(req); | |
668 | } | |
669 | ||
670 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
816e2e7a | 671 | |
586ac6f7 | 672 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
816e2e7a TG |
673 | assert(req); |
674 | assert(message); | |
675 | ||
676 | req->message = message; | |
677 | ||
e2acdb6b | 678 | /* set client id based on MAC address if client did not send an explicit |
a6f1e036 | 679 | one */ |
816e2e7a | 680 | if (!req->client_id.data) { |
9a0f246f | 681 | void *data; |
816e2e7a | 682 | |
9a0f246f | 683 | data = malloc0(ETH_ALEN + 1); |
816e2e7a TG |
684 | if (!data) |
685 | return -ENOMEM; | |
686 | ||
9a0f246f LP |
687 | ((uint8_t*) data)[0] = 0x01; |
688 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN); | |
689 | ||
816e2e7a TG |
690 | req->client_id.length = ETH_ALEN + 1; |
691 | req->client_id.data = data; | |
816e2e7a TG |
692 | } |
693 | ||
694 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) | |
695 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
696 | ||
9a0f246f | 697 | if (req->lifetime <= 0) |
586ac6f7 LP |
698 | req->lifetime = MAX(1ULL, server->default_lease_time); |
699 | ||
700 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
701 | req->lifetime = server->max_lease_time; | |
c7d9ffe6 | 702 | |
816e2e7a TG |
703 | return 0; |
704 | } | |
705 | ||
87322b3a TG |
706 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { |
707 | assert(server); | |
708 | ||
709 | if (!server->pool_size) | |
710 | return -EINVAL; | |
711 | ||
99634696 TG |
712 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
713 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
714 | return -ERANGE; | |
87322b3a | 715 | |
99634696 | 716 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
87322b3a TG |
717 | } |
718 | ||
83cedf7a TG |
719 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
720 | ||
be077570 TG |
721 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, |
722 | size_t length) { | |
8e766630 | 723 | _cleanup_(dhcp_request_freep) DHCPRequest *req = NULL; |
f693e9b3 | 724 | _cleanup_free_ char *error_message = NULL; |
87322b3a | 725 | DHCPLease *existing_lease; |
816e2e7a | 726 | int type, r; |
be077570 TG |
727 | |
728 | assert(server); | |
729 | assert(message); | |
730 | ||
731 | if (message->op != BOOTREQUEST || | |
732 | message->htype != ARPHRD_ETHER || | |
733 | message->hlen != ETHER_ADDR_LEN) | |
734 | return 0; | |
735 | ||
816e2e7a TG |
736 | req = new0(DHCPRequest, 1); |
737 | if (!req) | |
738 | return -ENOMEM; | |
739 | ||
f693e9b3 | 740 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
be077570 TG |
741 | if (type < 0) |
742 | return 0; | |
743 | ||
586ac6f7 | 744 | r = ensure_sane_request(server, req, message); |
816e2e7a TG |
745 | if (r < 0) |
746 | /* this only fails on critical errors */ | |
747 | return r; | |
748 | ||
a6f1e036 TG |
749 | existing_lease = hashmap_get(server->leases_by_client_id, |
750 | &req->client_id); | |
87322b3a | 751 | |
4dc35568 | 752 | switch(type) { |
9a0f246f LP |
753 | |
754 | case DHCP_DISCOVER: { | |
87322b3a TG |
755 | be32_t address = INADDR_ANY; |
756 | unsigned i; | |
2dead812 | 757 | |
4dc35568 TG |
758 | log_dhcp_server(server, "DISCOVER (0x%x)", |
759 | be32toh(req->message->xid)); | |
760 | ||
2dead812 TG |
761 | if (!server->pool_size) |
762 | /* no pool allocated */ | |
763 | return 0; | |
764 | ||
87322b3a TG |
765 | /* for now pick a random free address from the pool */ |
766 | if (existing_lease) | |
767 | address = existing_lease->address; | |
768 | else { | |
b826ab58 | 769 | struct siphash state; |
0cb3c286 | 770 | uint64_t hash; |
99634696 | 771 | uint32_t next_offer; |
83cedf7a TG |
772 | |
773 | /* even with no persistence of leases, we try to offer the same client | |
774 | the same IP address. we do this by using the hash of the client id | |
775 | as the offset into the pool of leases when finding the next free one */ | |
776 | ||
0cb3c286 | 777 | siphash24_init(&state, HASH_KEY.bytes); |
b826ab58 | 778 | client_id_hash_func(&req->client_id, &state); |
933f9cae | 779 | hash = htole64(siphash24_finalize(&state)); |
0cb3c286 | 780 | next_offer = hash % server->pool_size; |
83cedf7a | 781 | |
87322b3a | 782 | for (i = 0; i < server->pool_size; i++) { |
83cedf7a | 783 | if (!server->bound_leases[next_offer]) { |
99634696 | 784 | address = server->subnet | htobe32(server->pool_offset + next_offer); |
87322b3a | 785 | break; |
6408ba5f LP |
786 | } |
787 | ||
788 | next_offer = (next_offer + 1) % server->pool_size; | |
87322b3a TG |
789 | } |
790 | } | |
791 | ||
792 | if (address == INADDR_ANY) | |
793 | /* no free addresses left */ | |
794 | return 0; | |
2dead812 TG |
795 | |
796 | r = server_send_offer(server, req, address); | |
6e741541 | 797 | if (r < 0) |
4dc35568 | 798 | /* this only fails on critical errors */ |
6e741541 | 799 | return log_dhcp_server_errno(server, r, "Could not send offer: %m"); |
be077570 | 800 | |
6e741541 LP |
801 | log_dhcp_server(server, "OFFER (0x%x)", be32toh(req->message->xid)); |
802 | return DHCP_OFFER; | |
4dc35568 | 803 | } |
5b34277c | 804 | case DHCP_DECLINE: |
f693e9b3 | 805 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message)); |
5b34277c TG |
806 | |
807 | /* TODO: make sure we don't offer this address again */ | |
808 | ||
809 | return 1; | |
810 | ||
9a0f246f | 811 | case DHCP_REQUEST: { |
2dead812 | 812 | be32_t address; |
bd57b450 | 813 | bool init_reboot = false; |
87322b3a | 814 | int pool_offset; |
2dead812 TG |
815 | |
816 | /* see RFC 2131, section 4.3.2 */ | |
817 | ||
818 | if (req->server_id) { | |
819 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", | |
820 | be32toh(req->message->xid)); | |
821 | ||
822 | /* SELECTING */ | |
823 | if (req->server_id != server->address) | |
824 | /* client did not pick us */ | |
825 | return 0; | |
826 | ||
827 | if (req->message->ciaddr) | |
828 | /* this MUST be zero */ | |
829 | return 0; | |
830 | ||
831 | if (!req->requested_ip) | |
832 | /* this must be filled in with the yiaddr | |
833 | from the chosen OFFER */ | |
834 | return 0; | |
835 | ||
836 | address = req->requested_ip; | |
837 | } else if (req->requested_ip) { | |
838 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", | |
839 | be32toh(req->message->xid)); | |
840 | ||
841 | /* INIT-REBOOT */ | |
842 | if (req->message->ciaddr) | |
843 | /* this MUST be zero */ | |
844 | return 0; | |
845 | ||
bd57b450 | 846 | /* TODO: check more carefully if IP is correct */ |
2dead812 | 847 | address = req->requested_ip; |
bd57b450 | 848 | init_reboot = true; |
2dead812 TG |
849 | } else { |
850 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
851 | be32toh(req->message->xid)); | |
852 | ||
853 | /* REBINDING / RENEWING */ | |
854 | if (!req->message->ciaddr) | |
855 | /* this MUST be filled in with clients IP address */ | |
856 | return 0; | |
857 | ||
858 | address = req->message->ciaddr; | |
859 | } | |
860 | ||
87322b3a TG |
861 | pool_offset = get_pool_offset(server, address); |
862 | ||
863 | /* verify that the requested address is from the pool, and either | |
864 | owned by the current client or free */ | |
865 | if (pool_offset >= 0 && | |
866 | server->bound_leases[pool_offset] == existing_lease) { | |
867 | DHCPLease *lease; | |
a7f7d1bd | 868 | usec_t time_now = 0; |
87322b3a TG |
869 | |
870 | if (!existing_lease) { | |
871 | lease = new0(DHCPLease, 1); | |
357e1b17 LP |
872 | if (!lease) |
873 | return -ENOMEM; | |
28c78e07 | 874 | lease->address = address; |
87322b3a TG |
875 | lease->client_id.data = memdup(req->client_id.data, |
876 | req->client_id.length); | |
02557f97 TA |
877 | if (!lease->client_id.data) { |
878 | free(lease); | |
87322b3a | 879 | return -ENOMEM; |
02557f97 | 880 | } |
87322b3a | 881 | lease->client_id.length = req->client_id.length; |
a6f1e036 TG |
882 | memcpy(&lease->chaddr, &req->message->chaddr, |
883 | ETH_ALEN); | |
52750344 | 884 | lease->gateway = req->message->giaddr; |
87322b3a TG |
885 | } else |
886 | lease = existing_lease; | |
887 | ||
a6f1e036 TG |
888 | r = sd_event_now(server->event, |
889 | clock_boottime_or_monotonic(), | |
890 | &time_now); | |
bff92d2c SS |
891 | if (r < 0) { |
892 | if (!existing_lease) | |
893 | dhcp_lease_free(lease); | |
38a03f06 | 894 | return r; |
bff92d2c SS |
895 | } |
896 | ||
87322b3a TG |
897 | lease->expiration = req->lifetime * USEC_PER_SEC + time_now; |
898 | ||
2dead812 TG |
899 | r = server_send_ack(server, req, address); |
900 | if (r < 0) { | |
901 | /* this only fails on critical errors */ | |
6e741541 | 902 | log_dhcp_server_errno(server, r, "Could not send ack: %m"); |
87322b3a TG |
903 | |
904 | if (!existing_lease) | |
905 | dhcp_lease_free(lease); | |
906 | ||
2dead812 TG |
907 | return r; |
908 | } else { | |
909 | log_dhcp_server(server, "ACK (0x%x)", | |
910 | be32toh(req->message->xid)); | |
87322b3a TG |
911 | |
912 | server->bound_leases[pool_offset] = lease; | |
a6f1e036 TG |
913 | hashmap_put(server->leases_by_client_id, |
914 | &lease->client_id, lease); | |
87322b3a | 915 | |
2dead812 TG |
916 | return DHCP_ACK; |
917 | } | |
6e741541 | 918 | |
bd57b450 TG |
919 | } else if (init_reboot) { |
920 | r = server_send_nak(server, req); | |
6e741541 | 921 | if (r < 0) |
bd57b450 | 922 | /* this only fails on critical errors */ |
6e741541 LP |
923 | return log_dhcp_server_errno(server, r, "Could not send nak: %m"); |
924 | ||
925 | log_dhcp_server(server, "NAK (0x%x)", be32toh(req->message->xid)); | |
926 | return DHCP_NAK; | |
bd57b450 | 927 | } |
2dead812 TG |
928 | |
929 | break; | |
930 | } | |
9a0f246f | 931 | |
500792d8 TG |
932 | case DHCP_RELEASE: { |
933 | int pool_offset; | |
934 | ||
935 | log_dhcp_server(server, "RELEASE (0x%x)", | |
936 | be32toh(req->message->xid)); | |
937 | ||
938 | if (!existing_lease) | |
939 | return 0; | |
940 | ||
941 | if (existing_lease->address != req->message->ciaddr) | |
942 | return 0; | |
943 | ||
944 | pool_offset = get_pool_offset(server, req->message->ciaddr); | |
945 | if (pool_offset < 0) | |
946 | return 0; | |
947 | ||
948 | if (server->bound_leases[pool_offset] == existing_lease) { | |
949 | server->bound_leases[pool_offset] = NULL; | |
950 | hashmap_remove(server->leases_by_client_id, existing_lease); | |
951 | dhcp_lease_free(existing_lease); | |
c3922c0c | 952 | } |
500792d8 | 953 | |
c3922c0c LP |
954 | return 0; |
955 | }} | |
4dc35568 TG |
956 | |
957 | return 0; | |
be077570 TG |
958 | } |
959 | ||
ff734080 TG |
960 | static int server_receive_message(sd_event_source *s, int fd, |
961 | uint32_t revents, void *userdata) { | |
be077570 | 962 | _cleanup_free_ DHCPMessage *message = NULL; |
3a864fe4 | 963 | uint8_t cmsgbuf[CMSG_LEN(sizeof(struct in_pktinfo))]; |
ff734080 TG |
964 | sd_dhcp_server *server = userdata; |
965 | struct iovec iov = {}; | |
966 | struct msghdr msg = { | |
967 | .msg_iov = &iov, | |
968 | .msg_iovlen = 1, | |
3a864fe4 TG |
969 | .msg_control = cmsgbuf, |
970 | .msg_controllen = sizeof(cmsgbuf), | |
ff734080 | 971 | }; |
3a864fe4 | 972 | struct cmsghdr *cmsg; |
4edc2c9b | 973 | ssize_t buflen, len; |
57027d03 | 974 | int r; |
ff734080 TG |
975 | |
976 | assert(server); | |
977 | ||
4edc2c9b LP |
978 | buflen = next_datagram_size_fd(fd); |
979 | if (buflen < 0) | |
980 | return buflen; | |
ff734080 | 981 | |
0d43d2fc | 982 | message = malloc(buflen); |
ff734080 TG |
983 | if (!message) |
984 | return -ENOMEM; | |
985 | ||
cb310866 | 986 | iov = IOVEC_MAKE(message, buflen); |
ff734080 | 987 | |
a38d9945 | 988 | len = recvmsg(fd, &msg, 0); |
0d43d2fc | 989 | if (len < 0) { |
4c701096 | 990 | if (IN_SET(errno, EAGAIN, EINTR)) |
0d43d2fc TG |
991 | return 0; |
992 | ||
993 | return -errno; | |
6408ba5f LP |
994 | } |
995 | if ((size_t)len < sizeof(DHCPMessage)) | |
be077570 | 996 | return 0; |
ff734080 | 997 | |
2a1288ff | 998 | CMSG_FOREACH(cmsg, &msg) { |
3a864fe4 TG |
999 | if (cmsg->cmsg_level == IPPROTO_IP && |
1000 | cmsg->cmsg_type == IP_PKTINFO && | |
1001 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) { | |
1002 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg); | |
1003 | ||
a6f1e036 TG |
1004 | /* TODO figure out if this can be done as a filter on |
1005 | * the socket, like for IPv6 */ | |
b3ec603c | 1006 | if (server->ifindex != info->ipi_ifindex) |
3a864fe4 TG |
1007 | return 0; |
1008 | ||
1009 | break; | |
1010 | } | |
1011 | } | |
1012 | ||
57027d03 LP |
1013 | r = dhcp_server_handle_message(server, message, (size_t) len); |
1014 | if (r < 0) | |
1015 | log_dhcp_server_errno(server, r, "Couldn't process incoming message: %m"); | |
1016 | ||
1017 | return 0; | |
ff734080 TG |
1018 | } |
1019 | ||
1020 | int sd_dhcp_server_start(sd_dhcp_server *server) { | |
1021 | int r; | |
1022 | ||
1023 | assert_return(server, -EINVAL); | |
1024 | assert_return(server->event, -EINVAL); | |
1025 | assert_return(!server->receive_message, -EBUSY); | |
cfcbb135 LP |
1026 | assert_return(server->fd_raw < 0, -EBUSY); |
1027 | assert_return(server->fd < 0, -EBUSY); | |
20af7091 | 1028 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH); |
ff734080 | 1029 | |
3e29b889 | 1030 | r = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0); |
8de4a226 TG |
1031 | if (r < 0) { |
1032 | r = -errno; | |
1033 | sd_dhcp_server_stop(server); | |
1034 | return r; | |
1035 | } | |
1036 | server->fd_raw = r; | |
1037 | ||
afe42aef | 1038 | r = dhcp_network_bind_udp_socket(server->ifindex, INADDR_ANY, DHCP_PORT_SERVER, -1); |
ff734080 TG |
1039 | if (r < 0) { |
1040 | sd_dhcp_server_stop(server); | |
1041 | return r; | |
1042 | } | |
1043 | server->fd = r; | |
1044 | ||
1045 | r = sd_event_add_io(server->event, &server->receive_message, | |
1046 | server->fd, EPOLLIN, | |
1047 | server_receive_message, server); | |
1048 | if (r < 0) { | |
1049 | sd_dhcp_server_stop(server); | |
1050 | return r; | |
1051 | } | |
1052 | ||
1053 | r = sd_event_source_set_priority(server->receive_message, | |
1054 | server->event_priority); | |
1055 | if (r < 0) { | |
1056 | sd_dhcp_server_stop(server); | |
1057 | return r; | |
1058 | } | |
1059 | ||
1060 | log_dhcp_server(server, "STARTED"); | |
1061 | ||
1062 | return 0; | |
1063 | } | |
52750344 TG |
1064 | |
1065 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { | |
1066 | unsigned i; | |
621ac3d2 | 1067 | int r = 0; |
52750344 TG |
1068 | |
1069 | assert_return(server, -EINVAL); | |
1070 | assert(server->bound_leases); | |
1071 | ||
1072 | for (i = 0; i < server->pool_size; i++) { | |
1073 | DHCPLease *lease = server->bound_leases[i]; | |
1074 | ||
99634696 | 1075 | if (!lease || lease == &server->invalid_lease) |
52750344 TG |
1076 | continue; |
1077 | ||
1078 | r = server_send_forcerenew(server, lease->address, | |
1079 | lease->gateway, | |
1080 | lease->chaddr); | |
1081 | if (r < 0) | |
1082 | return r; | |
6408ba5f LP |
1083 | |
1084 | log_dhcp_server(server, "FORCERENEW"); | |
52750344 TG |
1085 | } |
1086 | ||
1087 | return r; | |
1088 | } | |
8eb9058d | 1089 | |
64d6c229 | 1090 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { |
8eb9058d LP |
1091 | int r; |
1092 | ||
1093 | assert_return(server, -EINVAL); | |
089fb865 | 1094 | assert_return(timezone_is_valid(tz, LOG_DEBUG), -EINVAL); |
8eb9058d | 1095 | |
64d6c229 | 1096 | if (streq_ptr(tz, server->timezone)) |
8eb9058d LP |
1097 | return 0; |
1098 | ||
64d6c229 | 1099 | r = free_and_strdup(&server->timezone, tz); |
8eb9058d LP |
1100 | if (r < 0) |
1101 | return r; | |
1102 | ||
1103 | return 1; | |
1104 | } | |
586ac6f7 LP |
1105 | |
1106 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1107 | assert_return(server, -EINVAL); | |
1108 | ||
1109 | if (t == server->max_lease_time) | |
1110 | return 0; | |
1111 | ||
1112 | server->max_lease_time = t; | |
1113 | return 1; | |
1114 | } | |
1115 | ||
1116 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1117 | assert_return(server, -EINVAL); | |
1118 | ||
1119 | if (t == server->default_lease_time) | |
1120 | return 0; | |
1121 | ||
1122 | server->default_lease_time = t; | |
1123 | return 1; | |
1124 | } | |
1a04db0f | 1125 | |
c8407baf ZJS |
1126 | int sd_dhcp_server_set_servers( |
1127 | sd_dhcp_server *server, | |
1128 | sd_dhcp_lease_info what, | |
1129 | const struct in_addr addresses[], | |
1130 | unsigned n_addresses) { | |
1a04db0f | 1131 | |
1a04db0f | 1132 | assert_return(server, -EINVAL); |
c8407baf | 1133 | assert_return(addresses || n_addresses == 0, -EINVAL); |
1a04db0f | 1134 | |
c8407baf ZJS |
1135 | struct in_addr **a; |
1136 | unsigned *n_a; | |
1a04db0f | 1137 | |
c8407baf ZJS |
1138 | switch (what) { |
1139 | case SD_DHCP_LEASE_DNS_SERVERS: | |
1140 | a = &server->dns; | |
1141 | n_a = &server->n_dns; | |
1142 | break; | |
77ff6022 | 1143 | |
c8407baf ZJS |
1144 | case SD_DHCP_LEASE_NTP_SERVERS: |
1145 | a = &server->ntp; | |
1146 | n_a = &server->n_ntp; | |
1147 | break; | |
299d578f | 1148 | |
c8407baf ZJS |
1149 | case SD_DHCP_LEASE_SIP_SERVERS: |
1150 | a = &server->sip; | |
1151 | n_a = &server->n_sip; | |
1152 | break; | |
299d578f | 1153 | |
c8407baf ZJS |
1154 | case SD_DHCP_LEASE_POP3_SERVERS: |
1155 | a = &server->pop3_server; | |
1156 | n_a = &server->n_pop3_server; | |
1157 | break; | |
299d578f | 1158 | |
c8407baf ZJS |
1159 | case SD_DHCP_LEASE_SMTP_SERVERS: |
1160 | a = &server->smtp_server; | |
1161 | n_a = &server->n_smtp_server; | |
1162 | break; | |
299d578f | 1163 | |
c8407baf | 1164 | default: |
e4ff0393 | 1165 | return log_debug_errno(SYNTHETIC_ERRNO(ENXIO), |
86b52a39 | 1166 | "Unknown DHCP lease info item %d.", what); |
299d578f SS |
1167 | } |
1168 | ||
c8407baf ZJS |
1169 | if (*n_a == n_addresses && |
1170 | memcmp(*a, addresses, sizeof(struct in_addr) * n_addresses) == 0) | |
f678ac7e SS |
1171 | return 0; |
1172 | ||
c8407baf | 1173 | struct in_addr *c = NULL; |
f678ac7e | 1174 | |
c8407baf ZJS |
1175 | if (n_addresses > 0) { |
1176 | c = newdup(struct in_addr, addresses, n_addresses); | |
f678ac7e SS |
1177 | if (!c) |
1178 | return -ENOMEM; | |
f678ac7e SS |
1179 | } |
1180 | ||
c8407baf ZJS |
1181 | free(*a); |
1182 | *a = c; | |
1183 | *n_a = n_addresses; | |
f678ac7e SS |
1184 | return 1; |
1185 | } | |
1186 | ||
c8407baf ZJS |
1187 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], unsigned n) { |
1188 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_DNS_SERVERS, dns, n); | |
1189 | } | |
1190 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], unsigned n) { | |
1191 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_NTP_SERVERS, ntp, n); | |
1192 | } | |
1193 | int sd_dhcp_server_set_sip(sd_dhcp_server *server, const struct in_addr sip[], unsigned n) { | |
1194 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_SIP_SERVERS, sip, n); | |
1195 | } | |
1196 | int sd_dhcp_server_set_pop3_server(sd_dhcp_server *server, const struct in_addr pop3[], unsigned n) { | |
1197 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_POP3_SERVERS, pop3, n); | |
1198 | } | |
1199 | int sd_dhcp_server_set_smtp_server(sd_dhcp_server *server, const struct in_addr smtp[], unsigned n) { | |
1200 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_SMTP_SERVERS, smtp, n); | |
2c649ca1 SS |
1201 | } |
1202 | ||
77ff6022 CG |
1203 | int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled) { |
1204 | assert_return(server, -EINVAL); | |
1205 | ||
1206 | if (enabled == server->emit_router) | |
1207 | return 0; | |
1208 | ||
1209 | server->emit_router = enabled; | |
1210 | ||
1211 | return 1; | |
1212 | } | |
564ca984 | 1213 | |
461dbb2f | 1214 | int sd_dhcp_server_add_option(sd_dhcp_server *server, sd_dhcp_option *v) { |
564ca984 SS |
1215 | int r; |
1216 | ||
1217 | assert_return(server, -EINVAL); | |
1218 | assert_return(v, -EINVAL); | |
1219 | ||
7354900d DW |
1220 | r = ordered_hashmap_ensure_allocated(&server->extra_options, &dhcp_option_hash_ops); |
1221 | if (r < 0) | |
1222 | return r; | |
1223 | ||
1224 | r = ordered_hashmap_put(server->extra_options, UINT_TO_PTR(v->option), v); | |
1225 | if (r < 0) | |
1226 | return r; | |
1227 | ||
1228 | sd_dhcp_option_ref(v); | |
1229 | return 0; | |
1230 | } | |
1231 | ||
1232 | int sd_dhcp_server_add_vendor_option(sd_dhcp_server *server, sd_dhcp_option *v) { | |
1233 | int r; | |
1234 | ||
1235 | assert_return(server, -EINVAL); | |
1236 | assert_return(v, -EINVAL); | |
1237 | ||
1238 | r = ordered_hashmap_ensure_allocated(&server->vendor_options, &dhcp_option_hash_ops); | |
564ca984 SS |
1239 | if (r < 0) |
1240 | return -ENOMEM; | |
1241 | ||
7354900d | 1242 | r = ordered_hashmap_put(server->vendor_options, v, v); |
564ca984 SS |
1243 | if (r < 0) |
1244 | return r; | |
1245 | ||
461dbb2f | 1246 | sd_dhcp_option_ref(v); |
564ca984 SS |
1247 | |
1248 | return 1; | |
1249 | } |