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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
b44cd882 | 2 | /*** |
810adae9 | 3 | Copyright © 2013 Intel Corporation. All rights reserved. |
b44cd882 TG |
4 | ***/ |
5 | ||
ddb82ec2 | 6 | #include <net/if_arp.h> |
ff734080 TG |
7 | #include <sys/ioctl.h> |
8 | ||
b44cd882 | 9 | #include "sd-dhcp-server.h" |
6e86b24d | 10 | #include "sd-id128.h" |
07630cea | 11 | |
b5efdb8a | 12 | #include "alloc-util.h" |
ff734080 | 13 | #include "dhcp-internal.h" |
07630cea | 14 | #include "dhcp-server-internal.h" |
3ffd4af2 | 15 | #include "fd-util.h" |
07630cea | 16 | #include "in-addr-util.h" |
cb310866 | 17 | #include "io-util.h" |
61a9fa8f | 18 | #include "network-common.h" |
ebffea2a | 19 | #include "ordered-set.h" |
07630cea LP |
20 | #include "siphash24.h" |
21 | #include "string-util.h" | |
9ae84244 | 22 | #include "unaligned.h" |
b44cd882 | 23 | |
586ac6f7 LP |
24 | #define DHCP_DEFAULT_LEASE_TIME_USEC USEC_PER_HOUR |
25 | #define DHCP_MAX_LEASE_TIME_USEC (USEC_PER_HOUR*12) | |
4dc35568 | 26 | |
6121fc30 | 27 | static DHCPLease *dhcp_lease_free(DHCPLease *lease) { |
45a9eac9 | 28 | if (!lease) |
6121fc30 | 29 | return NULL; |
45a9eac9 RM |
30 | |
31 | free(lease->client_id.data); | |
6121fc30 | 32 | return mfree(lease); |
45a9eac9 RM |
33 | } |
34 | ||
99634696 TG |
35 | /* configures the server's address and subnet, and optionally the pool's size and offset into the subnet |
36 | * the whole pool must fit into the subnet, and may not contain the first (any) nor last (broadcast) address | |
37 | * moreover, the server's own address may be in the pool, and is in that case reserved in order not to | |
38 | * accidentally hand it out */ | |
90810f7a LP |
39 | int sd_dhcp_server_configure_pool( |
40 | sd_dhcp_server *server, | |
41 | const struct in_addr *address, | |
42 | unsigned char prefixlen, | |
43 | uint32_t offset, | |
44 | uint32_t size) { | |
45 | ||
99634696 TG |
46 | struct in_addr netmask_addr; |
47 | be32_t netmask; | |
48 | uint32_t server_off, broadcast_off, size_max; | |
49 | ||
2dead812 TG |
50 | assert_return(server, -EINVAL); |
51 | assert_return(address, -EINVAL); | |
99634696 TG |
52 | assert_return(address->s_addr != INADDR_ANY, -EINVAL); |
53 | assert_return(prefixlen <= 32, -ERANGE); | |
99634696 | 54 | |
5a941f5f | 55 | assert_se(in4_addr_prefixlen_to_netmask(&netmask_addr, prefixlen)); |
99634696 TG |
56 | netmask = netmask_addr.s_addr; |
57 | ||
58 | server_off = be32toh(address->s_addr & ~netmask); | |
59 | broadcast_off = be32toh(~netmask); | |
60 | ||
61 | /* the server address cannot be the subnet address */ | |
62 | assert_return(server_off != 0, -ERANGE); | |
63 | ||
64 | /* nor the broadcast address */ | |
65 | assert_return(server_off != broadcast_off, -ERANGE); | |
66 | ||
67 | /* 0 offset means we should set a default, we skip the first (subnet) address | |
68 | and take the next one */ | |
69 | if (offset == 0) | |
70 | offset = 1; | |
71 | ||
72 | size_max = (broadcast_off + 1) /* the number of addresses in the subnet */ | |
73 | - offset /* exclude the addresses before the offset */ | |
74 | - 1; /* exclude the last (broadcast) address */ | |
75 | ||
76 | /* The pool must contain at least one address */ | |
77 | assert_return(size_max >= 1, -ERANGE); | |
78 | ||
79 | if (size != 0) | |
80 | assert_return(size <= size_max, -ERANGE); | |
81 | else | |
82 | size = size_max; | |
87322b3a | 83 | |
45a9eac9 | 84 | if (server->address != address->s_addr || server->netmask != netmask || server->pool_size != size || server->pool_offset != offset) { |
45a9eac9 RM |
85 | |
86 | free(server->bound_leases); | |
87 | server->bound_leases = new0(DHCPLease*, size); | |
88 | if (!server->bound_leases) | |
89 | return -ENOMEM; | |
2dead812 | 90 | |
45a9eac9 RM |
91 | server->pool_offset = offset; |
92 | server->pool_size = size; | |
2dead812 | 93 | |
45a9eac9 RM |
94 | server->address = address->s_addr; |
95 | server->netmask = netmask; | |
96 | server->subnet = address->s_addr & netmask; | |
99634696 | 97 | |
45a9eac9 RM |
98 | if (server_off >= offset && server_off - offset < size) |
99 | server->bound_leases[server_off - offset] = &server->invalid_lease; | |
100 | ||
101 | /* Drop any leases associated with the old address range */ | |
6121fc30 | 102 | hashmap_clear(server->leases_by_client_id); |
36d35f22 MAL |
103 | |
104 | if (server->callback) | |
105 | server->callback(server, SD_DHCP_SERVER_EVENT_LEASE_CHANGED, server->callback_userdata); | |
45a9eac9 | 106 | } |
20af7091 TG |
107 | |
108 | return 0; | |
109 | } | |
110 | ||
04c01369 | 111 | int sd_dhcp_server_is_running(sd_dhcp_server *server) { |
75677581 | 112 | assert_return(server, false); |
7c16313f TG |
113 | |
114 | return !!server->receive_message; | |
115 | } | |
116 | ||
7a08d314 | 117 | void client_id_hash_func(const DHCPClientId *id, struct siphash *state) { |
87322b3a TG |
118 | assert(id); |
119 | assert(id->length); | |
120 | assert(id->data); | |
121 | ||
1e2527a6 | 122 | siphash24_compress(&id->length, sizeof(id->length), state); |
b826ab58 | 123 | siphash24_compress(id->data, id->length, state); |
87322b3a TG |
124 | } |
125 | ||
7a08d314 | 126 | int client_id_compare_func(const DHCPClientId *a, const DHCPClientId *b) { |
a0edd02e | 127 | int r; |
87322b3a | 128 | |
87322b3a TG |
129 | assert(!a->length || a->data); |
130 | assert(!b->length || b->data); | |
131 | ||
a0edd02e FB |
132 | r = CMP(a->length, b->length); |
133 | if (r != 0) | |
134 | return r; | |
87322b3a TG |
135 | |
136 | return memcmp(a->data, b->data, a->length); | |
137 | } | |
138 | ||
6121fc30 YW |
139 | DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(dhcp_lease_hash_ops, DHCPClientId, client_id_hash_func, client_id_compare_func, |
140 | DHCPLease, dhcp_lease_free); | |
d5099efc | 141 | |
8301aa0b | 142 | static sd_dhcp_server *dhcp_server_free(sd_dhcp_server *server) { |
8301aa0b | 143 | assert(server); |
ff734080 | 144 | |
3bdace9b | 145 | log_dhcp_server(server, "UNREF"); |
87322b3a | 146 | |
3bdace9b | 147 | sd_dhcp_server_stop(server); |
87322b3a | 148 | |
3bdace9b LP |
149 | sd_event_unref(server->event); |
150 | ||
8eb9058d | 151 | free(server->timezone); |
ddb82ec2 | 152 | |
2324fd3a | 153 | for (sd_dhcp_lease_server_type_t i = 0; i < _SD_DHCP_LEASE_SERVER_TYPE_MAX; i++) |
ddb82ec2 | 154 | free(server->servers[i].addr); |
8eb9058d | 155 | |
3bdace9b LP |
156 | hashmap_free(server->leases_by_client_id); |
157 | ||
ebffea2a SS |
158 | ordered_set_free(server->extra_options); |
159 | ordered_set_free(server->vendor_options); | |
564ca984 | 160 | |
3bdace9b | 161 | free(server->bound_leases); |
61a9fa8f YW |
162 | |
163 | free(server->ifname); | |
6b430fdb | 164 | return mfree(server); |
b44cd882 TG |
165 | } |
166 | ||
8301aa0b YW |
167 | DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp_server, sd_dhcp_server, dhcp_server_free); |
168 | ||
3a864fe4 | 169 | int sd_dhcp_server_new(sd_dhcp_server **ret, int ifindex) { |
4afd3348 | 170 | _cleanup_(sd_dhcp_server_unrefp) sd_dhcp_server *server = NULL; |
b44cd882 TG |
171 | |
172 | assert_return(ret, -EINVAL); | |
3a864fe4 | 173 | assert_return(ifindex > 0, -EINVAL); |
b44cd882 | 174 | |
61a9fa8f | 175 | server = new(sd_dhcp_server, 1); |
b44cd882 TG |
176 | if (!server) |
177 | return -ENOMEM; | |
178 | ||
61a9fa8f YW |
179 | *server = (sd_dhcp_server) { |
180 | .n_ref = 1, | |
181 | .fd_raw = -1, | |
182 | .fd = -1, | |
183 | .address = htobe32(INADDR_ANY), | |
184 | .netmask = htobe32(INADDR_ANY), | |
185 | .ifindex = ifindex, | |
186 | .default_lease_time = DIV_ROUND_UP(DHCP_DEFAULT_LEASE_TIME_USEC, USEC_PER_SEC), | |
187 | .max_lease_time = DIV_ROUND_UP(DHCP_MAX_LEASE_TIME_USEC, USEC_PER_SEC), | |
188 | }; | |
357e1b17 | 189 | |
6121fc30 | 190 | server->leases_by_client_id = hashmap_new(&dhcp_lease_hash_ops); |
357e1b17 LP |
191 | if (!server->leases_by_client_id) |
192 | return -ENOMEM; | |
193 | ||
1cc6c93a | 194 | *ret = TAKE_PTR(server); |
b44cd882 TG |
195 | |
196 | return 0; | |
197 | } | |
198 | ||
61a9fa8f YW |
199 | int sd_dhcp_server_set_ifname(sd_dhcp_server *server, const char *ifname) { |
200 | assert_return(server, -EINVAL); | |
201 | assert_return(ifname, -EINVAL); | |
202 | ||
203 | if (!ifname_valid_full(ifname, IFNAME_VALID_ALTERNATIVE)) | |
204 | return -EINVAL; | |
205 | ||
206 | return free_and_strdup(&server->ifname, ifname); | |
207 | } | |
208 | ||
209 | const char *sd_dhcp_server_get_ifname(sd_dhcp_server *server) { | |
210 | if (!server) | |
211 | return NULL; | |
212 | ||
213 | return get_ifname(server->ifindex, &server->ifname); | |
214 | } | |
215 | ||
32d20645 | 216 | int sd_dhcp_server_attach_event(sd_dhcp_server *server, sd_event *event, int64_t priority) { |
b44cd882 TG |
217 | int r; |
218 | ||
219 | assert_return(server, -EINVAL); | |
220 | assert_return(!server->event, -EBUSY); | |
221 | ||
222 | if (event) | |
223 | server->event = sd_event_ref(event); | |
224 | else { | |
225 | r = sd_event_default(&server->event); | |
226 | if (r < 0) | |
227 | return r; | |
228 | } | |
229 | ||
230 | server->event_priority = priority; | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | int sd_dhcp_server_detach_event(sd_dhcp_server *server) { | |
236 | assert_return(server, -EINVAL); | |
237 | ||
238 | server->event = sd_event_unref(server->event); | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) { | |
244 | assert_return(server, NULL); | |
245 | ||
246 | return server->event; | |
247 | } | |
ff734080 TG |
248 | |
249 | int sd_dhcp_server_stop(sd_dhcp_server *server) { | |
c8bae363 YW |
250 | if (!server) |
251 | return 0; | |
ff734080 TG |
252 | |
253 | server->receive_message = | |
254 | sd_event_source_unref(server->receive_message); | |
255 | ||
8de4a226 | 256 | server->fd_raw = safe_close(server->fd_raw); |
ff734080 TG |
257 | server->fd = safe_close(server->fd); |
258 | ||
259 | log_dhcp_server(server, "STOPPED"); | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
a6f1e036 TG |
264 | static int dhcp_server_send_unicast_raw(sd_dhcp_server *server, |
265 | DHCPPacket *packet, size_t len) { | |
969b009d TG |
266 | union sockaddr_union link = { |
267 | .ll.sll_family = AF_PACKET, | |
8e38570e | 268 | .ll.sll_protocol = htobe16(ETH_P_IP), |
b3ec603c | 269 | .ll.sll_ifindex = server->ifindex, |
969b009d TG |
270 | .ll.sll_halen = ETH_ALEN, |
271 | }; | |
969b009d TG |
272 | |
273 | assert(server); | |
b3ec603c | 274 | assert(server->ifindex > 0); |
969b009d TG |
275 | assert(server->address); |
276 | assert(packet); | |
277 | assert(len > sizeof(DHCPPacket)); | |
278 | ||
279 | memcpy(&link.ll.sll_addr, &packet->dhcp.chaddr, ETH_ALEN); | |
280 | ||
281 | dhcp_packet_append_ip_headers(packet, server->address, DHCP_PORT_SERVER, | |
a6f1e036 | 282 | packet->dhcp.yiaddr, |
afe42aef | 283 | DHCP_PORT_CLIENT, len, -1); |
969b009d | 284 | |
b3ec603c | 285 | return dhcp_network_send_raw_socket(server->fd_raw, &link, packet, len); |
969b009d TG |
286 | } |
287 | ||
288 | static int dhcp_server_send_udp(sd_dhcp_server *server, be32_t destination, | |
8eb7b6a5 | 289 | uint16_t destination_port, |
969b009d TG |
290 | DHCPMessage *message, size_t len) { |
291 | union sockaddr_union dest = { | |
292 | .in.sin_family = AF_INET, | |
8eb7b6a5 | 293 | .in.sin_port = htobe16(destination_port), |
969b009d TG |
294 | .in.sin_addr.s_addr = destination, |
295 | }; | |
296 | struct iovec iov = { | |
297 | .iov_base = message, | |
298 | .iov_len = len, | |
299 | }; | |
fb29cdbe | 300 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in_pktinfo))) control = {}; |
969b009d TG |
301 | struct msghdr msg = { |
302 | .msg_name = &dest, | |
303 | .msg_namelen = sizeof(dest.in), | |
304 | .msg_iov = &iov, | |
305 | .msg_iovlen = 1, | |
fb29cdbe LP |
306 | .msg_control = &control, |
307 | .msg_controllen = sizeof(control), | |
969b009d TG |
308 | }; |
309 | struct cmsghdr *cmsg; | |
310 | struct in_pktinfo *pktinfo; | |
969b009d TG |
311 | |
312 | assert(server); | |
4c9cb12c | 313 | assert(server->fd >= 0); |
969b009d TG |
314 | assert(message); |
315 | assert(len > sizeof(DHCPMessage)); | |
316 | ||
317 | cmsg = CMSG_FIRSTHDR(&msg); | |
318 | assert(cmsg); | |
319 | ||
320 | cmsg->cmsg_level = IPPROTO_IP; | |
321 | cmsg->cmsg_type = IP_PKTINFO; | |
322 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo)); | |
323 | ||
324 | /* we attach source interface and address info to the message | |
325 | rather than binding the socket. This will be mostly useful | |
326 | when we gain support for arbitrary number of server addresses | |
327 | */ | |
328 | pktinfo = (struct in_pktinfo*) CMSG_DATA(cmsg); | |
329 | assert(pktinfo); | |
330 | ||
b3ec603c | 331 | pktinfo->ipi_ifindex = server->ifindex; |
969b009d TG |
332 | pktinfo->ipi_spec_dst.s_addr = server->address; |
333 | ||
0f01c1f9 | 334 | if (sendmsg(server->fd, &msg, 0) < 0) |
969b009d TG |
335 | return -errno; |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
340 | static bool requested_broadcast(DHCPRequest *req) { | |
341 | assert(req); | |
342 | ||
343 | return req->message->flags & htobe16(0x8000); | |
344 | } | |
345 | ||
346 | int dhcp_server_send_packet(sd_dhcp_server *server, | |
347 | DHCPRequest *req, DHCPPacket *packet, | |
348 | int type, size_t optoffset) { | |
349 | be32_t destination = INADDR_ANY; | |
8eb7b6a5 | 350 | uint16_t destination_port = DHCP_PORT_CLIENT; |
969b009d TG |
351 | int r; |
352 | ||
353 | assert(server); | |
354 | assert(req); | |
355 | assert(req->max_optlen); | |
356 | assert(optoffset <= req->max_optlen); | |
357 | assert(packet); | |
358 | ||
359 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 360 | SD_DHCP_OPTION_SERVER_IDENTIFIER, |
969b009d TG |
361 | 4, &server->address); |
362 | if (r < 0) | |
363 | return r; | |
364 | ||
365 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &optoffset, 0, | |
22805d92 | 366 | SD_DHCP_OPTION_END, 0, NULL); |
969b009d TG |
367 | if (r < 0) |
368 | return r; | |
369 | ||
370 | /* RFC 2131 Section 4.1 | |
371 | ||
372 | If the ’giaddr’ field in a DHCP message from a client is non-zero, | |
373 | the server sends any return messages to the ’DHCP server’ port on the | |
374 | BOOTP relay agent whose address appears in ’giaddr’. If the ’giaddr’ | |
375 | field is zero and the ’ciaddr’ field is nonzero, then the server | |
376 | unicasts DHCPOFFER and DHCPACK messages to the address in ’ciaddr’. | |
377 | If ’giaddr’ is zero and ’ciaddr’ is zero, and the broadcast bit is | |
378 | set, then the server broadcasts DHCPOFFER and DHCPACK messages to | |
379 | 0xffffffff. If the broadcast bit is not set and ’giaddr’ is zero and | |
380 | ’ciaddr’ is zero, then the server unicasts DHCPOFFER and DHCPACK | |
381 | messages to the client’s hardware address and ’yiaddr’ address. In | |
382 | all cases, when ’giaddr’ is zero, the server broadcasts any DHCPNAK | |
383 | messages to 0xffffffff. | |
384 | ||
385 | Section 4.3.2 | |
386 | ||
387 | If ’giaddr’ is set in the DHCPREQUEST message, the client is on a | |
388 | different subnet. The server MUST set the broadcast bit in the | |
389 | DHCPNAK, so that the relay agent will broadcast the DHCPNAK to the | |
390 | client, because the client may not have a correct network address | |
391 | or subnet mask, and the client may not be answering ARP requests. | |
392 | */ | |
393 | if (req->message->giaddr) { | |
394 | destination = req->message->giaddr; | |
8eb7b6a5 | 395 | destination_port = DHCP_PORT_SERVER; |
969b009d TG |
396 | if (type == DHCP_NAK) |
397 | packet->dhcp.flags = htobe16(0x8000); | |
398 | } else if (req->message->ciaddr && type != DHCP_NAK) | |
399 | destination = req->message->ciaddr; | |
400 | ||
d6bd972d | 401 | if (destination != INADDR_ANY) |
8eb7b6a5 PF |
402 | return dhcp_server_send_udp(server, destination, |
403 | destination_port, &packet->dhcp, | |
969b009d | 404 | sizeof(DHCPMessage) + optoffset); |
d6bd972d | 405 | else if (requested_broadcast(req) || type == DHCP_NAK) |
a6f1e036 | 406 | return dhcp_server_send_udp(server, INADDR_BROADCAST, |
8eb7b6a5 | 407 | destination_port, &packet->dhcp, |
d6bd972d | 408 | sizeof(DHCPMessage) + optoffset); |
969b009d | 409 | else |
a6f1e036 TG |
410 | /* we cannot send UDP packet to specific MAC address when the |
411 | address is not yet configured, so must fall back to raw | |
412 | packets */ | |
969b009d TG |
413 | return dhcp_server_send_unicast_raw(server, packet, |
414 | sizeof(DHCPPacket) + optoffset); | |
415 | } | |
416 | ||
4dc35568 | 417 | static int server_message_init(sd_dhcp_server *server, DHCPPacket **ret, |
a6f1e036 TG |
418 | uint8_t type, size_t *_optoffset, |
419 | DHCPRequest *req) { | |
4dc35568 | 420 | _cleanup_free_ DHCPPacket *packet = NULL; |
1231c4d2 | 421 | size_t optoffset = 0; |
4dc35568 TG |
422 | int r; |
423 | ||
424 | assert(server); | |
425 | assert(ret); | |
426 | assert(_optoffset); | |
bd57b450 | 427 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK, DHCP_NAK)); |
4dc35568 TG |
428 | |
429 | packet = malloc0(sizeof(DHCPPacket) + req->max_optlen); | |
430 | if (!packet) | |
431 | return -ENOMEM; | |
432 | ||
a6f1e036 | 433 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, |
76253e73 DW |
434 | be32toh(req->message->xid), type, ARPHRD_ETHER, |
435 | req->max_optlen, &optoffset); | |
4dc35568 TG |
436 | if (r < 0) |
437 | return r; | |
438 | ||
439 | packet->dhcp.flags = req->message->flags; | |
440 | packet->dhcp.giaddr = req->message->giaddr; | |
441 | memcpy(&packet->dhcp.chaddr, &req->message->chaddr, ETH_ALEN); | |
442 | ||
443 | *_optoffset = optoffset; | |
1cc6c93a | 444 | *ret = TAKE_PTR(packet); |
4dc35568 TG |
445 | |
446 | return 0; | |
447 | } | |
448 | ||
986c0edf | 449 | static int server_send_offer_or_ack( |
ddb82ec2 LP |
450 | sd_dhcp_server *server, |
451 | DHCPRequest *req, | |
986c0edf YW |
452 | be32_t address, |
453 | uint8_t type) { | |
ddb82ec2 | 454 | |
2dead812 | 455 | _cleanup_free_ DHCPPacket *packet = NULL; |
7354900d | 456 | sd_dhcp_option *j; |
986c0edf | 457 | be32_t lease_time; |
564ca984 | 458 | size_t offset; |
2dead812 TG |
459 | int r; |
460 | ||
986c0edf YW |
461 | assert(server); |
462 | assert(req); | |
463 | assert(IN_SET(type, DHCP_OFFER, DHCP_ACK)); | |
464 | ||
465 | r = server_message_init(server, &packet, type, &offset, req); | |
2dead812 TG |
466 | if (r < 0) |
467 | return r; | |
468 | ||
469 | packet->dhcp.yiaddr = address; | |
470 | ||
c7d9ffe6 | 471 | lease_time = htobe32(req->lifetime); |
2dead812 | 472 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 473 | SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME, 4, |
a6f1e036 | 474 | &lease_time); |
2dead812 TG |
475 | if (r < 0) |
476 | return r; | |
477 | ||
59b8f6b6 | 478 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
22805d92 | 479 | SD_DHCP_OPTION_SUBNET_MASK, 4, &server->netmask); |
59b8f6b6 TG |
480 | if (r < 0) |
481 | return r; | |
482 | ||
77ff6022 CG |
483 | if (server->emit_router) { |
484 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, | |
485 | SD_DHCP_OPTION_ROUTER, 4, &server->address); | |
486 | if (r < 0) | |
487 | return r; | |
488 | } | |
59b8f6b6 | 489 | |
986c0edf YW |
490 | if (type == DHCP_ACK) { |
491 | static const uint8_t option_map[_SD_DHCP_LEASE_SERVER_TYPE_MAX] = { | |
492 | [SD_DHCP_LEASE_DNS] = SD_DHCP_OPTION_DOMAIN_NAME_SERVER, | |
493 | [SD_DHCP_LEASE_NTP] = SD_DHCP_OPTION_NTP_SERVER, | |
494 | [SD_DHCP_LEASE_SIP] = SD_DHCP_OPTION_SIP_SERVER, | |
495 | [SD_DHCP_LEASE_POP3] = SD_DHCP_OPTION_POP3_SERVER, | |
496 | [SD_DHCP_LEASE_SMTP] = SD_DHCP_OPTION_SMTP_SERVER, | |
497 | [SD_DHCP_LEASE_LPR] = SD_DHCP_OPTION_LPR_SERVER, | |
498 | }; | |
499 | ||
500 | for (sd_dhcp_lease_server_type_t k = 0; k < _SD_DHCP_LEASE_SERVER_TYPE_MAX; k++) { | |
501 | if (server->servers[k].size <= 0) | |
502 | continue; | |
503 | ||
504 | r = dhcp_option_append( | |
505 | &packet->dhcp, req->max_optlen, &offset, 0, | |
506 | option_map[k], | |
507 | sizeof(struct in_addr) * server->servers[k].size, | |
508 | server->servers[k].addr); | |
509 | if (r < 0) | |
510 | return r; | |
511 | } | |
2c649ca1 | 512 | |
50018bfa | 513 | |
986c0edf YW |
514 | if (server->timezone) { |
515 | r = dhcp_option_append( | |
516 | &packet->dhcp, req->max_optlen, &offset, 0, | |
517 | SD_DHCP_OPTION_NEW_TZDB_TIMEZONE, | |
518 | strlen(server->timezone), server->timezone); | |
519 | if (r < 0) | |
520 | return r; | |
521 | } | |
8eb9058d LP |
522 | } |
523 | ||
ebffea2a | 524 | ORDERED_SET_FOREACH(j, server->extra_options) { |
7354900d DW |
525 | r = dhcp_option_append(&packet->dhcp, req->max_optlen, &offset, 0, |
526 | j->option, j->length, j->data); | |
527 | if (r < 0) | |
528 | return r; | |
529 | } | |
530 | ||
ebffea2a | 531 | if (!ordered_set_isempty(server->vendor_options)) { |
564ca984 SS |
532 | r = dhcp_option_append( |
533 | &packet->dhcp, req->max_optlen, &offset, 0, | |
534 | SD_DHCP_OPTION_VENDOR_SPECIFIC, | |
ebffea2a | 535 | ordered_set_size(server->vendor_options), server->vendor_options); |
564ca984 SS |
536 | if (r < 0) |
537 | return r; | |
538 | } | |
539 | ||
986c0edf | 540 | r = dhcp_server_send_packet(server, req, packet, type, offset); |
2dead812 TG |
541 | if (r < 0) |
542 | return r; | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
bd57b450 TG |
547 | static int server_send_nak(sd_dhcp_server *server, DHCPRequest *req) { |
548 | _cleanup_free_ DHCPPacket *packet = NULL; | |
549 | size_t offset; | |
550 | int r; | |
551 | ||
552 | r = server_message_init(server, &packet, DHCP_NAK, &offset, req); | |
553 | if (r < 0) | |
554 | return r; | |
555 | ||
b3ec603c | 556 | return dhcp_server_send_packet(server, req, packet, DHCP_NAK, offset); |
bd57b450 TG |
557 | } |
558 | ||
a6f1e036 | 559 | static int server_send_forcerenew(sd_dhcp_server *server, be32_t address, |
141261f1 | 560 | be32_t gateway, const uint8_t chaddr[]) { |
52750344 TG |
561 | _cleanup_free_ DHCPPacket *packet = NULL; |
562 | size_t optoffset = 0; | |
563 | int r; | |
564 | ||
565 | assert(server); | |
566 | assert(address != INADDR_ANY); | |
567 | assert(chaddr); | |
568 | ||
569 | packet = malloc0(sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE); | |
570 | if (!packet) | |
571 | return -ENOMEM; | |
572 | ||
573 | r = dhcp_message_init(&packet->dhcp, BOOTREPLY, 0, | |
76253e73 DW |
574 | DHCP_FORCERENEW, ARPHRD_ETHER, |
575 | DHCP_MIN_OPTIONS_SIZE, &optoffset); | |
52750344 TG |
576 | if (r < 0) |
577 | return r; | |
578 | ||
579 | r = dhcp_option_append(&packet->dhcp, DHCP_MIN_OPTIONS_SIZE, | |
22805d92 | 580 | &optoffset, 0, SD_DHCP_OPTION_END, 0, NULL); |
52750344 TG |
581 | if (r < 0) |
582 | return r; | |
583 | ||
584 | memcpy(&packet->dhcp.chaddr, chaddr, ETH_ALEN); | |
585 | ||
8eb7b6a5 PF |
586 | r = dhcp_server_send_udp(server, address, DHCP_PORT_CLIENT, |
587 | &packet->dhcp, | |
52750344 | 588 | sizeof(DHCPMessage) + optoffset); |
c15fb62a TA |
589 | if (r < 0) |
590 | return r; | |
52750344 TG |
591 | |
592 | return 0; | |
593 | } | |
594 | ||
b3ec603c | 595 | static int parse_request(uint8_t code, uint8_t len, const void *option, void *userdata) { |
89ca10c6 | 596 | DHCPRequest *req = userdata; |
816e2e7a TG |
597 | |
598 | assert(req); | |
599 | ||
600 | switch(code) { | |
22805d92 | 601 | case SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME: |
c7d9ffe6 | 602 | if (len == 4) |
9ae84244 | 603 | req->lifetime = unaligned_read_be32(option); |
c7d9ffe6 TG |
604 | |
605 | break; | |
22805d92 | 606 | case SD_DHCP_OPTION_REQUESTED_IP_ADDRESS: |
2dead812 | 607 | if (len == 4) |
9ae84244 | 608 | memcpy(&req->requested_ip, option, sizeof(be32_t)); |
2dead812 TG |
609 | |
610 | break; | |
22805d92 | 611 | case SD_DHCP_OPTION_SERVER_IDENTIFIER: |
816e2e7a | 612 | if (len == 4) |
9ae84244 | 613 | memcpy(&req->server_id, option, sizeof(be32_t)); |
816e2e7a TG |
614 | |
615 | break; | |
22805d92 | 616 | case SD_DHCP_OPTION_CLIENT_IDENTIFIER: |
816e2e7a TG |
617 | if (len >= 2) { |
618 | uint8_t *data; | |
619 | ||
620 | data = memdup(option, len); | |
621 | if (!data) | |
622 | return -ENOMEM; | |
623 | ||
624 | free(req->client_id.data); | |
625 | req->client_id.data = data; | |
626 | req->client_id.length = len; | |
627 | } | |
628 | ||
629 | break; | |
22805d92 | 630 | case SD_DHCP_OPTION_MAXIMUM_MESSAGE_SIZE: |
76a9d0f1 LP |
631 | |
632 | if (len == 2 && unaligned_read_be16(option) >= sizeof(DHCPPacket)) | |
9ae84244 | 633 | req->max_optlen = unaligned_read_be16(option) - sizeof(DHCPPacket); |
816e2e7a TG |
634 | |
635 | break; | |
636 | } | |
637 | ||
638 | return 0; | |
639 | } | |
640 | ||
75db809a | 641 | static DHCPRequest* dhcp_request_free(DHCPRequest *req) { |
816e2e7a | 642 | if (!req) |
75db809a | 643 | return NULL; |
816e2e7a TG |
644 | |
645 | free(req->client_id.data); | |
75db809a | 646 | return mfree(req); |
816e2e7a TG |
647 | } |
648 | ||
649 | DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPRequest*, dhcp_request_free); | |
816e2e7a | 650 | |
586ac6f7 | 651 | static int ensure_sane_request(sd_dhcp_server *server, DHCPRequest *req, DHCPMessage *message) { |
816e2e7a TG |
652 | assert(req); |
653 | assert(message); | |
654 | ||
655 | req->message = message; | |
656 | ||
e2acdb6b | 657 | /* set client id based on MAC address if client did not send an explicit |
a6f1e036 | 658 | one */ |
816e2e7a | 659 | if (!req->client_id.data) { |
9a0f246f | 660 | void *data; |
816e2e7a | 661 | |
9a0f246f | 662 | data = malloc0(ETH_ALEN + 1); |
816e2e7a TG |
663 | if (!data) |
664 | return -ENOMEM; | |
665 | ||
9a0f246f LP |
666 | ((uint8_t*) data)[0] = 0x01; |
667 | memcpy((uint8_t*) data + 1, &message->chaddr, ETH_ALEN); | |
668 | ||
816e2e7a TG |
669 | req->client_id.length = ETH_ALEN + 1; |
670 | req->client_id.data = data; | |
816e2e7a TG |
671 | } |
672 | ||
673 | if (req->max_optlen < DHCP_MIN_OPTIONS_SIZE) | |
674 | req->max_optlen = DHCP_MIN_OPTIONS_SIZE; | |
675 | ||
9a0f246f | 676 | if (req->lifetime <= 0) |
586ac6f7 LP |
677 | req->lifetime = MAX(1ULL, server->default_lease_time); |
678 | ||
679 | if (server->max_lease_time > 0 && req->lifetime > server->max_lease_time) | |
680 | req->lifetime = server->max_lease_time; | |
c7d9ffe6 | 681 | |
816e2e7a TG |
682 | return 0; |
683 | } | |
684 | ||
87322b3a TG |
685 | static int get_pool_offset(sd_dhcp_server *server, be32_t requested_ip) { |
686 | assert(server); | |
687 | ||
688 | if (!server->pool_size) | |
689 | return -EINVAL; | |
690 | ||
99634696 TG |
691 | if (be32toh(requested_ip) < (be32toh(server->subnet) | server->pool_offset) || |
692 | be32toh(requested_ip) >= (be32toh(server->subnet) | (server->pool_offset + server->pool_size))) | |
693 | return -ERANGE; | |
87322b3a | 694 | |
99634696 | 695 | return be32toh(requested_ip & ~server->netmask) - server->pool_offset; |
87322b3a TG |
696 | } |
697 | ||
83cedf7a TG |
698 | #define HASH_KEY SD_ID128_MAKE(0d,1d,fe,bd,f1,24,bd,b3,47,f1,dd,6e,73,21,93,30) |
699 | ||
be077570 TG |
700 | int dhcp_server_handle_message(sd_dhcp_server *server, DHCPMessage *message, |
701 | size_t length) { | |
8e766630 | 702 | _cleanup_(dhcp_request_freep) DHCPRequest *req = NULL; |
f693e9b3 | 703 | _cleanup_free_ char *error_message = NULL; |
87322b3a | 704 | DHCPLease *existing_lease; |
816e2e7a | 705 | int type, r; |
be077570 TG |
706 | |
707 | assert(server); | |
708 | assert(message); | |
709 | ||
710 | if (message->op != BOOTREQUEST || | |
711 | message->htype != ARPHRD_ETHER || | |
712 | message->hlen != ETHER_ADDR_LEN) | |
713 | return 0; | |
714 | ||
816e2e7a TG |
715 | req = new0(DHCPRequest, 1); |
716 | if (!req) | |
717 | return -ENOMEM; | |
718 | ||
f693e9b3 | 719 | type = dhcp_option_parse(message, length, parse_request, req, &error_message); |
be077570 TG |
720 | if (type < 0) |
721 | return 0; | |
722 | ||
586ac6f7 | 723 | r = ensure_sane_request(server, req, message); |
816e2e7a TG |
724 | if (r < 0) |
725 | /* this only fails on critical errors */ | |
726 | return r; | |
727 | ||
a6f1e036 TG |
728 | existing_lease = hashmap_get(server->leases_by_client_id, |
729 | &req->client_id); | |
87322b3a | 730 | |
4dc35568 | 731 | switch(type) { |
9a0f246f LP |
732 | |
733 | case DHCP_DISCOVER: { | |
87322b3a TG |
734 | be32_t address = INADDR_ANY; |
735 | unsigned i; | |
2dead812 | 736 | |
4dc35568 TG |
737 | log_dhcp_server(server, "DISCOVER (0x%x)", |
738 | be32toh(req->message->xid)); | |
739 | ||
2dead812 TG |
740 | if (!server->pool_size) |
741 | /* no pool allocated */ | |
742 | return 0; | |
743 | ||
87322b3a TG |
744 | /* for now pick a random free address from the pool */ |
745 | if (existing_lease) | |
746 | address = existing_lease->address; | |
747 | else { | |
b826ab58 | 748 | struct siphash state; |
0cb3c286 | 749 | uint64_t hash; |
99634696 | 750 | uint32_t next_offer; |
83cedf7a TG |
751 | |
752 | /* even with no persistence of leases, we try to offer the same client | |
753 | the same IP address. we do this by using the hash of the client id | |
754 | as the offset into the pool of leases when finding the next free one */ | |
755 | ||
0cb3c286 | 756 | siphash24_init(&state, HASH_KEY.bytes); |
b826ab58 | 757 | client_id_hash_func(&req->client_id, &state); |
933f9cae | 758 | hash = htole64(siphash24_finalize(&state)); |
0cb3c286 | 759 | next_offer = hash % server->pool_size; |
83cedf7a | 760 | |
87322b3a | 761 | for (i = 0; i < server->pool_size; i++) { |
83cedf7a | 762 | if (!server->bound_leases[next_offer]) { |
99634696 | 763 | address = server->subnet | htobe32(server->pool_offset + next_offer); |
87322b3a | 764 | break; |
6408ba5f LP |
765 | } |
766 | ||
767 | next_offer = (next_offer + 1) % server->pool_size; | |
87322b3a TG |
768 | } |
769 | } | |
770 | ||
771 | if (address == INADDR_ANY) | |
772 | /* no free addresses left */ | |
773 | return 0; | |
2dead812 | 774 | |
986c0edf | 775 | r = server_send_offer_or_ack(server, req, address, DHCP_OFFER); |
6e741541 | 776 | if (r < 0) |
4dc35568 | 777 | /* this only fails on critical errors */ |
6e741541 | 778 | return log_dhcp_server_errno(server, r, "Could not send offer: %m"); |
be077570 | 779 | |
6e741541 LP |
780 | log_dhcp_server(server, "OFFER (0x%x)", be32toh(req->message->xid)); |
781 | return DHCP_OFFER; | |
4dc35568 | 782 | } |
5b34277c | 783 | case DHCP_DECLINE: |
f693e9b3 | 784 | log_dhcp_server(server, "DECLINE (0x%x): %s", be32toh(req->message->xid), strna(error_message)); |
5b34277c TG |
785 | |
786 | /* TODO: make sure we don't offer this address again */ | |
787 | ||
788 | return 1; | |
789 | ||
9a0f246f | 790 | case DHCP_REQUEST: { |
2dead812 | 791 | be32_t address; |
bd57b450 | 792 | bool init_reboot = false; |
87322b3a | 793 | int pool_offset; |
2dead812 TG |
794 | |
795 | /* see RFC 2131, section 4.3.2 */ | |
796 | ||
797 | if (req->server_id) { | |
798 | log_dhcp_server(server, "REQUEST (selecting) (0x%x)", | |
799 | be32toh(req->message->xid)); | |
800 | ||
801 | /* SELECTING */ | |
802 | if (req->server_id != server->address) | |
803 | /* client did not pick us */ | |
804 | return 0; | |
805 | ||
806 | if (req->message->ciaddr) | |
807 | /* this MUST be zero */ | |
808 | return 0; | |
809 | ||
810 | if (!req->requested_ip) | |
811 | /* this must be filled in with the yiaddr | |
812 | from the chosen OFFER */ | |
813 | return 0; | |
814 | ||
815 | address = req->requested_ip; | |
816 | } else if (req->requested_ip) { | |
817 | log_dhcp_server(server, "REQUEST (init-reboot) (0x%x)", | |
818 | be32toh(req->message->xid)); | |
819 | ||
820 | /* INIT-REBOOT */ | |
821 | if (req->message->ciaddr) | |
822 | /* this MUST be zero */ | |
823 | return 0; | |
824 | ||
bd57b450 | 825 | /* TODO: check more carefully if IP is correct */ |
2dead812 | 826 | address = req->requested_ip; |
bd57b450 | 827 | init_reboot = true; |
2dead812 TG |
828 | } else { |
829 | log_dhcp_server(server, "REQUEST (rebinding/renewing) (0x%x)", | |
830 | be32toh(req->message->xid)); | |
831 | ||
832 | /* REBINDING / RENEWING */ | |
833 | if (!req->message->ciaddr) | |
834 | /* this MUST be filled in with clients IP address */ | |
835 | return 0; | |
836 | ||
837 | address = req->message->ciaddr; | |
838 | } | |
839 | ||
87322b3a TG |
840 | pool_offset = get_pool_offset(server, address); |
841 | ||
842 | /* verify that the requested address is from the pool, and either | |
843 | owned by the current client or free */ | |
844 | if (pool_offset >= 0 && | |
845 | server->bound_leases[pool_offset] == existing_lease) { | |
846 | DHCPLease *lease; | |
a7f7d1bd | 847 | usec_t time_now = 0; |
87322b3a TG |
848 | |
849 | if (!existing_lease) { | |
850 | lease = new0(DHCPLease, 1); | |
357e1b17 LP |
851 | if (!lease) |
852 | return -ENOMEM; | |
28c78e07 | 853 | lease->address = address; |
87322b3a TG |
854 | lease->client_id.data = memdup(req->client_id.data, |
855 | req->client_id.length); | |
02557f97 TA |
856 | if (!lease->client_id.data) { |
857 | free(lease); | |
87322b3a | 858 | return -ENOMEM; |
02557f97 | 859 | } |
87322b3a | 860 | lease->client_id.length = req->client_id.length; |
a6f1e036 TG |
861 | memcpy(&lease->chaddr, &req->message->chaddr, |
862 | ETH_ALEN); | |
52750344 | 863 | lease->gateway = req->message->giaddr; |
87322b3a TG |
864 | } else |
865 | lease = existing_lease; | |
866 | ||
a6f1e036 TG |
867 | r = sd_event_now(server->event, |
868 | clock_boottime_or_monotonic(), | |
869 | &time_now); | |
bff92d2c SS |
870 | if (r < 0) { |
871 | if (!existing_lease) | |
872 | dhcp_lease_free(lease); | |
38a03f06 | 873 | return r; |
bff92d2c SS |
874 | } |
875 | ||
87322b3a TG |
876 | lease->expiration = req->lifetime * USEC_PER_SEC + time_now; |
877 | ||
986c0edf | 878 | r = server_send_offer_or_ack(server, req, address, DHCP_ACK); |
2dead812 TG |
879 | if (r < 0) { |
880 | /* this only fails on critical errors */ | |
6e741541 | 881 | log_dhcp_server_errno(server, r, "Could not send ack: %m"); |
87322b3a TG |
882 | |
883 | if (!existing_lease) | |
884 | dhcp_lease_free(lease); | |
885 | ||
2dead812 TG |
886 | return r; |
887 | } else { | |
888 | log_dhcp_server(server, "ACK (0x%x)", | |
889 | be32toh(req->message->xid)); | |
87322b3a TG |
890 | |
891 | server->bound_leases[pool_offset] = lease; | |
a6f1e036 TG |
892 | hashmap_put(server->leases_by_client_id, |
893 | &lease->client_id, lease); | |
87322b3a | 894 | |
36d35f22 MAL |
895 | if (server->callback) |
896 | server->callback(server, SD_DHCP_SERVER_EVENT_LEASE_CHANGED, server->callback_userdata); | |
897 | ||
2dead812 TG |
898 | return DHCP_ACK; |
899 | } | |
6e741541 | 900 | |
bd57b450 TG |
901 | } else if (init_reboot) { |
902 | r = server_send_nak(server, req); | |
6e741541 | 903 | if (r < 0) |
bd57b450 | 904 | /* this only fails on critical errors */ |
6e741541 LP |
905 | return log_dhcp_server_errno(server, r, "Could not send nak: %m"); |
906 | ||
907 | log_dhcp_server(server, "NAK (0x%x)", be32toh(req->message->xid)); | |
908 | return DHCP_NAK; | |
bd57b450 | 909 | } |
2dead812 TG |
910 | |
911 | break; | |
912 | } | |
9a0f246f | 913 | |
500792d8 TG |
914 | case DHCP_RELEASE: { |
915 | int pool_offset; | |
916 | ||
917 | log_dhcp_server(server, "RELEASE (0x%x)", | |
918 | be32toh(req->message->xid)); | |
919 | ||
920 | if (!existing_lease) | |
921 | return 0; | |
922 | ||
923 | if (existing_lease->address != req->message->ciaddr) | |
924 | return 0; | |
925 | ||
926 | pool_offset = get_pool_offset(server, req->message->ciaddr); | |
927 | if (pool_offset < 0) | |
928 | return 0; | |
929 | ||
930 | if (server->bound_leases[pool_offset] == existing_lease) { | |
931 | server->bound_leases[pool_offset] = NULL; | |
932 | hashmap_remove(server->leases_by_client_id, existing_lease); | |
933 | dhcp_lease_free(existing_lease); | |
36d35f22 MAL |
934 | |
935 | if (server->callback) | |
936 | server->callback(server, SD_DHCP_SERVER_EVENT_LEASE_CHANGED, server->callback_userdata); | |
c3922c0c | 937 | } |
500792d8 | 938 | |
c3922c0c LP |
939 | return 0; |
940 | }} | |
4dc35568 TG |
941 | |
942 | return 0; | |
be077570 TG |
943 | } |
944 | ||
ff734080 TG |
945 | static int server_receive_message(sd_event_source *s, int fd, |
946 | uint32_t revents, void *userdata) { | |
be077570 | 947 | _cleanup_free_ DHCPMessage *message = NULL; |
fb29cdbe | 948 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct in_pktinfo))) control; |
ff734080 TG |
949 | sd_dhcp_server *server = userdata; |
950 | struct iovec iov = {}; | |
951 | struct msghdr msg = { | |
952 | .msg_iov = &iov, | |
953 | .msg_iovlen = 1, | |
fb29cdbe LP |
954 | .msg_control = &control, |
955 | .msg_controllen = sizeof(control), | |
ff734080 | 956 | }; |
3a864fe4 | 957 | struct cmsghdr *cmsg; |
4edc2c9b | 958 | ssize_t buflen, len; |
57027d03 | 959 | int r; |
ff734080 TG |
960 | |
961 | assert(server); | |
962 | ||
4edc2c9b LP |
963 | buflen = next_datagram_size_fd(fd); |
964 | if (buflen < 0) | |
965 | return buflen; | |
ff734080 | 966 | |
0d43d2fc | 967 | message = malloc(buflen); |
ff734080 TG |
968 | if (!message) |
969 | return -ENOMEM; | |
970 | ||
cb310866 | 971 | iov = IOVEC_MAKE(message, buflen); |
ff734080 | 972 | |
2efa5bc6 LP |
973 | len = recvmsg_safe(fd, &msg, 0); |
974 | if (IN_SET(len, -EAGAIN, -EINTR)) | |
975 | return 0; | |
976 | if (len < 0) | |
977 | return len; | |
978 | if ((size_t) len < sizeof(DHCPMessage)) | |
be077570 | 979 | return 0; |
ff734080 | 980 | |
2a1288ff | 981 | CMSG_FOREACH(cmsg, &msg) { |
3a864fe4 TG |
982 | if (cmsg->cmsg_level == IPPROTO_IP && |
983 | cmsg->cmsg_type == IP_PKTINFO && | |
984 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct in_pktinfo))) { | |
985 | struct in_pktinfo *info = (struct in_pktinfo*)CMSG_DATA(cmsg); | |
986 | ||
a6f1e036 TG |
987 | /* TODO figure out if this can be done as a filter on |
988 | * the socket, like for IPv6 */ | |
b3ec603c | 989 | if (server->ifindex != info->ipi_ifindex) |
3a864fe4 TG |
990 | return 0; |
991 | ||
992 | break; | |
993 | } | |
994 | } | |
995 | ||
57027d03 LP |
996 | r = dhcp_server_handle_message(server, message, (size_t) len); |
997 | if (r < 0) | |
998 | log_dhcp_server_errno(server, r, "Couldn't process incoming message: %m"); | |
999 | ||
1000 | return 0; | |
ff734080 TG |
1001 | } |
1002 | ||
1003 | int sd_dhcp_server_start(sd_dhcp_server *server) { | |
1004 | int r; | |
1005 | ||
1006 | assert_return(server, -EINVAL); | |
1007 | assert_return(server->event, -EINVAL); | |
1008 | assert_return(!server->receive_message, -EBUSY); | |
cfcbb135 LP |
1009 | assert_return(server->fd_raw < 0, -EBUSY); |
1010 | assert_return(server->fd < 0, -EBUSY); | |
20af7091 | 1011 | assert_return(server->address != htobe32(INADDR_ANY), -EUNATCH); |
ff734080 | 1012 | |
3e29b889 | 1013 | r = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0); |
8de4a226 TG |
1014 | if (r < 0) { |
1015 | r = -errno; | |
1016 | sd_dhcp_server_stop(server); | |
1017 | return r; | |
1018 | } | |
1019 | server->fd_raw = r; | |
1020 | ||
afe42aef | 1021 | r = dhcp_network_bind_udp_socket(server->ifindex, INADDR_ANY, DHCP_PORT_SERVER, -1); |
ff734080 TG |
1022 | if (r < 0) { |
1023 | sd_dhcp_server_stop(server); | |
1024 | return r; | |
1025 | } | |
1026 | server->fd = r; | |
1027 | ||
1028 | r = sd_event_add_io(server->event, &server->receive_message, | |
1029 | server->fd, EPOLLIN, | |
1030 | server_receive_message, server); | |
1031 | if (r < 0) { | |
1032 | sd_dhcp_server_stop(server); | |
1033 | return r; | |
1034 | } | |
1035 | ||
1036 | r = sd_event_source_set_priority(server->receive_message, | |
1037 | server->event_priority); | |
1038 | if (r < 0) { | |
1039 | sd_dhcp_server_stop(server); | |
1040 | return r; | |
1041 | } | |
1042 | ||
1043 | log_dhcp_server(server, "STARTED"); | |
1044 | ||
1045 | return 0; | |
1046 | } | |
52750344 TG |
1047 | |
1048 | int sd_dhcp_server_forcerenew(sd_dhcp_server *server) { | |
621ac3d2 | 1049 | int r = 0; |
52750344 TG |
1050 | |
1051 | assert_return(server, -EINVAL); | |
1052 | assert(server->bound_leases); | |
1053 | ||
fe96c0f8 | 1054 | for (uint32_t i = 0; i < server->pool_size; i++) { |
52750344 TG |
1055 | DHCPLease *lease = server->bound_leases[i]; |
1056 | ||
99634696 | 1057 | if (!lease || lease == &server->invalid_lease) |
52750344 TG |
1058 | continue; |
1059 | ||
1060 | r = server_send_forcerenew(server, lease->address, | |
1061 | lease->gateway, | |
1062 | lease->chaddr); | |
1063 | if (r < 0) | |
1064 | return r; | |
6408ba5f LP |
1065 | |
1066 | log_dhcp_server(server, "FORCERENEW"); | |
52750344 TG |
1067 | } |
1068 | ||
1069 | return r; | |
1070 | } | |
8eb9058d | 1071 | |
64d6c229 | 1072 | int sd_dhcp_server_set_timezone(sd_dhcp_server *server, const char *tz) { |
8eb9058d LP |
1073 | int r; |
1074 | ||
1075 | assert_return(server, -EINVAL); | |
089fb865 | 1076 | assert_return(timezone_is_valid(tz, LOG_DEBUG), -EINVAL); |
8eb9058d | 1077 | |
64d6c229 | 1078 | if (streq_ptr(tz, server->timezone)) |
8eb9058d LP |
1079 | return 0; |
1080 | ||
64d6c229 | 1081 | r = free_and_strdup(&server->timezone, tz); |
8eb9058d LP |
1082 | if (r < 0) |
1083 | return r; | |
1084 | ||
1085 | return 1; | |
1086 | } | |
586ac6f7 LP |
1087 | |
1088 | int sd_dhcp_server_set_max_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1089 | assert_return(server, -EINVAL); | |
1090 | ||
1091 | if (t == server->max_lease_time) | |
1092 | return 0; | |
1093 | ||
1094 | server->max_lease_time = t; | |
1095 | return 1; | |
1096 | } | |
1097 | ||
1098 | int sd_dhcp_server_set_default_lease_time(sd_dhcp_server *server, uint32_t t) { | |
1099 | assert_return(server, -EINVAL); | |
1100 | ||
1101 | if (t == server->default_lease_time) | |
1102 | return 0; | |
1103 | ||
1104 | server->default_lease_time = t; | |
1105 | return 1; | |
1106 | } | |
1a04db0f | 1107 | |
c8407baf ZJS |
1108 | int sd_dhcp_server_set_servers( |
1109 | sd_dhcp_server *server, | |
2324fd3a | 1110 | sd_dhcp_lease_server_type_t what, |
c8407baf | 1111 | const struct in_addr addresses[], |
90810f7a | 1112 | size_t n_addresses) { |
1a04db0f | 1113 | |
ddb82ec2 LP |
1114 | struct in_addr *c = NULL; |
1115 | ||
1a04db0f | 1116 | assert_return(server, -EINVAL); |
c8407baf | 1117 | assert_return(addresses || n_addresses == 0, -EINVAL); |
ddb82ec2 LP |
1118 | assert_return(what >= 0, -EINVAL); |
1119 | assert_return(what < _SD_DHCP_LEASE_SERVER_TYPE_MAX, -EINVAL); | |
1a04db0f | 1120 | |
ddb82ec2 LP |
1121 | if (server->servers[what].size == n_addresses && |
1122 | memcmp(server->servers[what].addr, addresses, sizeof(struct in_addr) * n_addresses) == 0) | |
f678ac7e SS |
1123 | return 0; |
1124 | ||
c8407baf ZJS |
1125 | if (n_addresses > 0) { |
1126 | c = newdup(struct in_addr, addresses, n_addresses); | |
f678ac7e SS |
1127 | if (!c) |
1128 | return -ENOMEM; | |
f678ac7e SS |
1129 | } |
1130 | ||
ddb82ec2 LP |
1131 | free(server->servers[what].addr); |
1132 | server->servers[what].addr = c; | |
1133 | server->servers[what].size = n_addresses; | |
f678ac7e SS |
1134 | return 1; |
1135 | } | |
1136 | ||
90810f7a | 1137 | int sd_dhcp_server_set_dns(sd_dhcp_server *server, const struct in_addr dns[], size_t n) { |
ddb82ec2 | 1138 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_DNS, dns, n); |
c8407baf | 1139 | } |
90810f7a | 1140 | int sd_dhcp_server_set_ntp(sd_dhcp_server *server, const struct in_addr ntp[], size_t n) { |
ddb82ec2 | 1141 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_NTP, ntp, n); |
c8407baf | 1142 | } |
90810f7a | 1143 | int sd_dhcp_server_set_sip(sd_dhcp_server *server, const struct in_addr sip[], size_t n) { |
ddb82ec2 | 1144 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_SIP, sip, n); |
c8407baf | 1145 | } |
90810f7a | 1146 | int sd_dhcp_server_set_pop3(sd_dhcp_server *server, const struct in_addr pop3[], size_t n) { |
ddb82ec2 | 1147 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_POP3, pop3, n); |
c8407baf | 1148 | } |
90810f7a | 1149 | int sd_dhcp_server_set_smtp(sd_dhcp_server *server, const struct in_addr smtp[], size_t n) { |
ddb82ec2 | 1150 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_SMTP, smtp, n); |
2c649ca1 | 1151 | } |
90810f7a | 1152 | int sd_dhcp_server_set_lpr(sd_dhcp_server *server, const struct in_addr lpr[], size_t n) { |
ddb82ec2 | 1153 | return sd_dhcp_server_set_servers(server, SD_DHCP_LEASE_LPR, lpr, n); |
50018bfa | 1154 | } |
2c649ca1 | 1155 | |
77ff6022 CG |
1156 | int sd_dhcp_server_set_emit_router(sd_dhcp_server *server, int enabled) { |
1157 | assert_return(server, -EINVAL); | |
1158 | ||
1159 | if (enabled == server->emit_router) | |
1160 | return 0; | |
1161 | ||
1162 | server->emit_router = enabled; | |
1163 | ||
1164 | return 1; | |
1165 | } | |
564ca984 | 1166 | |
461dbb2f | 1167 | int sd_dhcp_server_add_option(sd_dhcp_server *server, sd_dhcp_option *v) { |
564ca984 SS |
1168 | int r; |
1169 | ||
1170 | assert_return(server, -EINVAL); | |
1171 | assert_return(v, -EINVAL); | |
1172 | ||
ebffea2a | 1173 | r = ordered_set_ensure_put(&server->extra_options, &dhcp_option_hash_ops, v); |
7354900d DW |
1174 | if (r < 0) |
1175 | return r; | |
1176 | ||
1177 | sd_dhcp_option_ref(v); | |
1178 | return 0; | |
1179 | } | |
1180 | ||
1181 | int sd_dhcp_server_add_vendor_option(sd_dhcp_server *server, sd_dhcp_option *v) { | |
1182 | int r; | |
1183 | ||
1184 | assert_return(server, -EINVAL); | |
1185 | assert_return(v, -EINVAL); | |
1186 | ||
ebffea2a | 1187 | r = ordered_set_ensure_put(&server->vendor_options, &dhcp_option_hash_ops, v); |
564ca984 SS |
1188 | if (r < 0) |
1189 | return r; | |
1190 | ||
461dbb2f | 1191 | sd_dhcp_option_ref(v); |
564ca984 SS |
1192 | |
1193 | return 1; | |
1194 | } | |
5b03043a MAL |
1195 | |
1196 | int sd_dhcp_server_set_callback(sd_dhcp_server *server, sd_dhcp_server_callback_t cb, void *userdata) { | |
1197 | assert_return(server, -EINVAL); | |
1198 | ||
1199 | server->callback = cb; | |
1200 | server->callback_userdata = userdata; | |
1201 | ||
1202 | return 0; | |
1203 | } |