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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
8fcf1d61 | 2 | |
5ae0fb7f YW |
3 | #include <netinet/in.h> |
4 | #include <linux/if_arp.h> | |
5 | #include <linux/if.h> | |
6 | ||
8fcf1d61 YW |
7 | #include "sd-dhcp-server.h" |
8 | ||
dd1d3060 MAL |
9 | #include "fd-util.h" |
10 | #include "fileio.h" | |
093e3533 | 11 | #include "networkd-address.h" |
a95e9306 | 12 | #include "networkd-dhcp-server-bus.h" |
c517a49b | 13 | #include "networkd-dhcp-server-static-lease.h" |
14 | #include "networkd-dhcp-server.h" | |
8fcf1d61 YW |
15 | #include "networkd-link.h" |
16 | #include "networkd-manager.h" | |
17 | #include "networkd-network.h" | |
1d28a3cf | 18 | #include "networkd-queue.h" |
3b6a3bde | 19 | #include "networkd-route.h" |
564ca984 | 20 | #include "parse-util.h" |
dd1d3060 | 21 | #include "socket-netlink.h" |
564ca984 SS |
22 | #include "string-table.h" |
23 | #include "string-util.h" | |
dd1d3060 | 24 | #include "strv.h" |
8fcf1d61 | 25 | |
5ae0fb7f YW |
26 | static bool link_dhcp4_server_enabled(Link *link) { |
27 | assert(link); | |
28 | ||
29 | if (link->flags & IFF_LOOPBACK) | |
30 | return false; | |
31 | ||
32 | if (!link->network) | |
33 | return false; | |
34 | ||
5ae0fb7f YW |
35 | if (link->iftype == ARPHRD_CAN) |
36 | return false; | |
37 | ||
38 | return link->network->dhcp_server; | |
39 | } | |
40 | ||
0017ba31 YW |
41 | void network_adjust_dhcp_server(Network *network) { |
42 | assert(network); | |
43 | ||
44 | if (!network->dhcp_server) | |
45 | return; | |
46 | ||
47 | if (network->bond) { | |
48 | log_warning("%s: DHCPServer= is enabled for bond slave. Disabling DHCP server.", | |
49 | network->filename); | |
50 | network->dhcp_server = false; | |
51 | return; | |
52 | } | |
53 | ||
54 | if (!in4_addr_is_set(&network->dhcp_server_address)) { | |
55 | Address *address; | |
56 | bool have = false; | |
57 | ||
58 | ORDERED_HASHMAP_FOREACH(address, network->addresses_by_section) { | |
59 | if (section_is_invalid(address->section)) | |
60 | continue; | |
61 | if (address->family == AF_INET && | |
62 | !in4_addr_is_localhost(&address->in_addr.in) && | |
63 | in4_addr_is_null(&address->in_addr_peer.in)) { | |
64 | have = true; | |
65 | break; | |
66 | } | |
67 | } | |
68 | if (!have) { | |
69 | log_warning("%s: DHCPServer= is enabled, but no static address configured. " | |
70 | "Disabling DHCP server.", | |
71 | network->filename); | |
72 | network->dhcp_server = false; | |
73 | return; | |
74 | } | |
75 | } | |
76 | } | |
77 | ||
3b6a3bde YW |
78 | int link_request_dhcp_server_address(Link *link) { |
79 | _cleanup_(address_freep) Address *address = NULL; | |
80 | Address *existing; | |
81 | int r; | |
82 | ||
83 | assert(link); | |
84 | assert(link->network); | |
85 | ||
86 | if (!link_dhcp4_server_enabled(link)) | |
87 | return 0; | |
88 | ||
89 | if (!in4_addr_is_set(&link->network->dhcp_server_address)) | |
90 | return 0; | |
91 | ||
92 | r = address_new(&address); | |
93 | if (r < 0) | |
94 | return r; | |
95 | ||
96 | address->source = NETWORK_CONFIG_SOURCE_STATIC; | |
97 | address->family = AF_INET; | |
98 | address->in_addr.in = link->network->dhcp_server_address; | |
99 | address->prefixlen = link->network->dhcp_server_address_prefixlen; | |
100 | address_set_broadcast(address); | |
101 | ||
102 | if (address_get(link, address, &existing) >= 0 && | |
103 | address_exists(existing) && | |
104 | existing->source == NETWORK_CONFIG_SOURCE_STATIC) | |
105 | /* The same address seems explicitly configured in [Address] or [Network] section. | |
106 | * Configure the DHCP server address only when it is not. */ | |
107 | return 0; | |
108 | ||
109 | return link_request_static_address(link, TAKE_PTR(address), true); | |
110 | } | |
111 | ||
0017ba31 | 112 | static int link_find_dhcp_server_address(Link *link, Address **ret) { |
8fcf1d61 YW |
113 | Address *address; |
114 | ||
115 | assert(link); | |
116 | assert(link->network); | |
117 | ||
0017ba31 YW |
118 | /* If ServerAddress= is specified, then use the address. */ |
119 | if (in4_addr_is_set(&link->network->dhcp_server_address)) | |
120 | return link_get_ipv4_address(link, &link->network->dhcp_server_address, | |
121 | link->network->dhcp_server_address_prefixlen, ret); | |
8fcf1d61 | 122 | |
0017ba31 | 123 | /* If not, then select one from static addresses. */ |
3b6a3bde YW |
124 | SET_FOREACH(address, link->addresses) { |
125 | if (address->source != NETWORK_CONFIG_SOURCE_STATIC) | |
126 | continue; | |
127 | if (!address_exists(address)) | |
128 | continue; | |
129 | if (address->family != AF_INET) | |
130 | continue; | |
131 | if (in4_addr_is_localhost(&address->in_addr.in)) | |
132 | continue; | |
133 | if (in4_addr_is_set(&address->in_addr_peer.in)) | |
134 | continue; | |
135 | ||
136 | *ret = address; | |
137 | return 0; | |
138 | } | |
8fcf1d61 | 139 | |
0017ba31 | 140 | return -ENOENT; |
8fcf1d61 YW |
141 | } |
142 | ||
165d7c5c YW |
143 | static int dhcp_server_find_uplink(Link *link, Link **ret) { |
144 | assert(link); | |
145 | ||
146 | if (link->network->dhcp_server_uplink_name) | |
147 | return link_get_by_name(link->manager, link->network->dhcp_server_uplink_name, ret); | |
148 | ||
149 | if (link->network->dhcp_server_uplink_index > 0) | |
6eab614d | 150 | return link_get_by_index(link->manager, link->network->dhcp_server_uplink_index, ret); |
165d7c5c | 151 | |
63295b42 | 152 | if (link->network->dhcp_server_uplink_index == UPLINK_INDEX_AUTO) { |
165d7c5c YW |
153 | /* It is not necessary to propagate error in automatic selection. */ |
154 | if (manager_find_uplink(link->manager, AF_INET, link, ret) < 0) | |
155 | *ret = NULL; | |
156 | return 0; | |
157 | } | |
158 | ||
159 | *ret = NULL; | |
160 | return 0; | |
161 | } | |
162 | ||
2a71d57f LP |
163 | static int link_push_uplink_to_dhcp_server( |
164 | Link *link, | |
2324fd3a | 165 | sd_dhcp_lease_server_type_t what, |
2a71d57f LP |
166 | sd_dhcp_server *s) { |
167 | ||
8fcf1d61 | 168 | _cleanup_free_ struct in_addr *addresses = NULL; |
2a71d57f | 169 | bool use_dhcp_lease_data = true; |
319a4f4b | 170 | size_t n_addresses = 0; |
8fcf1d61 | 171 | |
2a71d57f | 172 | assert(link); |
8fcf1d61 | 173 | |
2a71d57f LP |
174 | if (!link->network) |
175 | return 0; | |
176 | assert(link->network); | |
8fcf1d61 | 177 | |
2a71d57f | 178 | log_link_debug(link, "Copying %s from link", dhcp_lease_server_type_to_string(what)); |
8fcf1d61 | 179 | |
2a71d57f | 180 | switch (what) { |
8fcf1d61 | 181 | |
2a71d57f LP |
182 | case SD_DHCP_LEASE_DNS: |
183 | /* For DNS we have a special case. We the data configured explicitly locally along with the | |
184 | * data from the DHCP lease. */ | |
8fcf1d61 | 185 | |
2a71d57f LP |
186 | for (unsigned i = 0; i < link->network->n_dns; i++) { |
187 | struct in_addr ia; | |
8fcf1d61 | 188 | |
2a71d57f | 189 | /* Only look for IPv4 addresses */ |
e77bd3fd | 190 | if (link->network->dns[i]->family != AF_INET) |
2a71d57f | 191 | continue; |
8fcf1d61 | 192 | |
e77bd3fd | 193 | ia = link->network->dns[i]->address.in; |
2a71d57f LP |
194 | |
195 | /* Never propagate obviously borked data */ | |
196 | if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia)) | |
197 | continue; | |
198 | ||
319a4f4b | 199 | if (!GREEDY_REALLOC(addresses, n_addresses + 1)) |
8fcf1d61 YW |
200 | return log_oom(); |
201 | ||
2a71d57f | 202 | addresses[n_addresses++] = ia; |
8fcf1d61 | 203 | } |
8fcf1d61 | 204 | |
2a71d57f LP |
205 | use_dhcp_lease_data = link->network->dhcp_use_dns; |
206 | break; | |
8fcf1d61 | 207 | |
2a71d57f LP |
208 | case SD_DHCP_LEASE_NTP: { |
209 | char **i; | |
8fcf1d61 | 210 | |
2a71d57f LP |
211 | /* For NTP things are similar, but for NTP hostnames can be configured too, which we cannot |
212 | * propagate via DHCP. Hence let's only propagate those which are IP addresses. */ | |
284e8fd0 | 213 | |
2a71d57f LP |
214 | STRV_FOREACH(i, link->network->ntp) { |
215 | union in_addr_union ia; | |
284e8fd0 | 216 | |
2a71d57f LP |
217 | if (in_addr_from_string(AF_INET, *i, &ia) < 0) |
218 | continue; | |
284e8fd0 | 219 | |
2a71d57f LP |
220 | /* Never propagate obviously borked data */ |
221 | if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in)) | |
222 | continue; | |
284e8fd0 | 223 | |
319a4f4b | 224 | if (!GREEDY_REALLOC(addresses, n_addresses + 1)) |
2a71d57f | 225 | return log_oom(); |
284e8fd0 | 226 | |
2a71d57f LP |
227 | addresses[n_addresses++] = ia.in; |
228 | } | |
284e8fd0 | 229 | |
2a71d57f | 230 | use_dhcp_lease_data = link->network->dhcp_use_ntp; |
24e6f458 | 231 | break; |
2a71d57f | 232 | } |
284e8fd0 | 233 | |
ddb82ec2 | 234 | case SD_DHCP_LEASE_SIP: |
2a71d57f LP |
235 | |
236 | /* For SIP we don't allow explicit, local configuration, but there's control whether to use the data */ | |
237 | use_dhcp_lease_data = link->network->dhcp_use_sip; | |
24e6f458 | 238 | break; |
284e8fd0 | 239 | |
2a71d57f LP |
240 | case SD_DHCP_LEASE_POP3: |
241 | case SD_DHCP_LEASE_SMTP: | |
ddb82ec2 | 242 | case SD_DHCP_LEASE_LPR: |
2a71d57f LP |
243 | /* For the other server types we currently do not allow local configuration of server data, |
244 | * since there are typically no local consumers of the data. */ | |
c4e585a3 | 245 | break; |
d361b373 | 246 | |
24e6f458 | 247 | default: |
04499a70 | 248 | assert_not_reached(); |
f6269fe7 SS |
249 | } |
250 | ||
2a71d57f | 251 | if (use_dhcp_lease_data && link->dhcp_lease) { |
24e6f458 | 252 | const struct in_addr *da; |
f6269fe7 | 253 | |
a2706075 | 254 | int n = sd_dhcp_lease_get_servers(link->dhcp_lease, what, &da); |
f6269fe7 | 255 | if (n > 0) { |
319a4f4b | 256 | if (!GREEDY_REALLOC(addresses, n_addresses + n)) |
f6269fe7 SS |
257 | return log_oom(); |
258 | ||
2a71d57f LP |
259 | for (int j = 0; j < n; j++) |
260 | if (in4_addr_is_non_local(&da[j])) | |
261 | addresses[n_addresses++] = da[j]; | |
f6269fe7 SS |
262 | } |
263 | } | |
264 | ||
265 | if (n_addresses <= 0) | |
266 | return 0; | |
267 | ||
24e6f458 | 268 | return sd_dhcp_server_set_servers(s, what, addresses, n_addresses); |
299d578f SS |
269 | } |
270 | ||
319a4f4b LP |
271 | static int dhcp4_server_parse_dns_server_string_and_warn( |
272 | const char *string, | |
273 | struct in_addr **addresses, | |
274 | size_t *n_addresses) { | |
275 | ||
dd1d3060 MAL |
276 | for (;;) { |
277 | _cleanup_free_ char *word = NULL, *server_name = NULL; | |
278 | union in_addr_union address; | |
279 | int family, r, ifindex = 0; | |
280 | ||
281 | r = extract_first_word(&string, &word, NULL, 0); | |
282 | if (r < 0) | |
283 | return r; | |
284 | if (r == 0) | |
285 | break; | |
286 | ||
287 | r = in_addr_ifindex_name_from_string_auto(word, &family, &address, &ifindex, &server_name); | |
288 | if (r < 0) { | |
289 | log_warning_errno(r, "Failed to parse DNS server address '%s', ignoring: %m", word); | |
290 | continue; | |
291 | } | |
292 | ||
293 | /* Only look for IPv4 addresses */ | |
294 | if (family != AF_INET) | |
295 | continue; | |
296 | ||
297 | /* Never propagate obviously borked data */ | |
298 | if (in4_addr_is_null(&address.in) || in4_addr_is_localhost(&address.in)) | |
299 | continue; | |
300 | ||
319a4f4b | 301 | if (!GREEDY_REALLOC(*addresses, *n_addresses + 1)) |
dd1d3060 MAL |
302 | return log_oom(); |
303 | ||
304 | (*addresses)[(*n_addresses)++] = address.in; | |
305 | } | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | static int dhcp4_server_set_dns_from_resolve_conf(Link *link) { | |
311 | _cleanup_free_ struct in_addr *addresses = NULL; | |
dd1d3060 | 312 | _cleanup_fclose_ FILE *f = NULL; |
319a4f4b | 313 | size_t n_addresses = 0; |
dd1d3060 MAL |
314 | int n = 0, r; |
315 | ||
316 | f = fopen(PRIVATE_UPLINK_RESOLV_CONF, "re"); | |
317 | if (!f) { | |
318 | if (errno == ENOENT) | |
319 | return 0; | |
320 | ||
321 | return log_warning_errno(errno, "Failed to open " PRIVATE_UPLINK_RESOLV_CONF ": %m"); | |
322 | } | |
323 | ||
324 | for (;;) { | |
325 | _cleanup_free_ char *line = NULL; | |
326 | const char *a; | |
327 | char *l; | |
328 | ||
329 | r = read_line(f, LONG_LINE_MAX, &line); | |
330 | if (r < 0) | |
331 | return log_error_errno(r, "Failed to read " PRIVATE_UPLINK_RESOLV_CONF ": %m"); | |
332 | if (r == 0) | |
333 | break; | |
334 | ||
335 | n++; | |
336 | ||
337 | l = strstrip(line); | |
338 | if (IN_SET(*l, '#', ';', 0)) | |
339 | continue; | |
340 | ||
341 | a = first_word(l, "nameserver"); | |
342 | if (!a) | |
343 | continue; | |
344 | ||
319a4f4b | 345 | r = dhcp4_server_parse_dns_server_string_and_warn(a, &addresses, &n_addresses); |
dd1d3060 MAL |
346 | if (r < 0) |
347 | log_warning_errno(r, "Failed to parse DNS server address '%s', ignoring.", a); | |
348 | } | |
349 | ||
350 | if (n_addresses <= 0) | |
351 | return 0; | |
352 | ||
353 | return sd_dhcp_server_set_dns(link->dhcp_server, addresses, n_addresses); | |
354 | } | |
355 | ||
1d28a3cf | 356 | static int dhcp4_server_configure(Link *link) { |
8fcf1d61 | 357 | bool acquired_uplink = false; |
461dbb2f | 358 | sd_dhcp_option *p; |
c517a49b | 359 | DHCPStaticLease *static_lease; |
564ca984 SS |
360 | Link *uplink = NULL; |
361 | Address *address; | |
11c38d3e | 362 | bool bind_to_interface; |
8fcf1d61 YW |
363 | int r; |
364 | ||
5ae0fb7f YW |
365 | assert(link); |
366 | ||
1d28a3cf | 367 | log_link_debug(link, "Configuring DHCP Server."); |
5ae0fb7f | 368 | |
1d28a3cf YW |
369 | if (link->dhcp_server) |
370 | return -EBUSY; | |
5ae0fb7f | 371 | |
1d28a3cf YW |
372 | r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex); |
373 | if (r < 0) | |
374 | return r; | |
5ae0fb7f | 375 | |
1d28a3cf YW |
376 | r = sd_dhcp_server_attach_event(link->dhcp_server, link->manager->event, 0); |
377 | if (r < 0) | |
378 | return r; | |
5ae0fb7f | 379 | |
a95e9306 LK |
380 | r = sd_dhcp_server_set_callback(link->dhcp_server, dhcp_server_callback, link); |
381 | if (r < 0) | |
382 | return log_link_warning_errno(link, r, "Failed to set callback for DHCPv4 server instance: %m"); | |
383 | ||
0017ba31 YW |
384 | r = link_find_dhcp_server_address(link, &address); |
385 | if (r < 0) | |
386 | return log_link_error_errno(link, r, "Failed to find suitable address for DHCPv4 server instance: %m"); | |
8fcf1d61 YW |
387 | |
388 | /* use the server address' subnet as the pool */ | |
389 | r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen, | |
390 | link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size); | |
391 | if (r < 0) | |
c00c3b64 | 392 | return log_link_error_errno(link, r, "Failed to configure address pool for DHCPv4 server instance: %m"); |
8fcf1d61 YW |
393 | |
394 | /* TODO: | |
395 | r = sd_dhcp_server_set_router(link->dhcp_server, &main_address->in_addr.in); | |
396 | if (r < 0) | |
397 | return r; | |
398 | */ | |
399 | ||
400 | if (link->network->dhcp_server_max_lease_time_usec > 0) { | |
401 | r = sd_dhcp_server_set_max_lease_time(link->dhcp_server, | |
402 | DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC)); | |
403 | if (r < 0) | |
c00c3b64 | 404 | return log_link_error_errno(link, r, "Failed to set maximum lease time for DHCPv4 server instance: %m"); |
8fcf1d61 YW |
405 | } |
406 | ||
407 | if (link->network->dhcp_server_default_lease_time_usec > 0) { | |
408 | r = sd_dhcp_server_set_default_lease_time(link->dhcp_server, | |
409 | DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC)); | |
410 | if (r < 0) | |
c00c3b64 | 411 | return log_link_error_errno(link, r, "Failed to set default lease time for DHCPv4 server instance: %m"); |
8fcf1d61 YW |
412 | } |
413 | ||
2324fd3a | 414 | for (sd_dhcp_lease_server_type_t type = 0; type < _SD_DHCP_LEASE_SERVER_TYPE_MAX; type ++) { |
2a71d57f LP |
415 | |
416 | if (!link->network->dhcp_server_emit[type].emit) | |
417 | continue; | |
418 | ||
419 | if (link->network->dhcp_server_emit[type].n_addresses > 0) | |
420 | /* Explicitly specified servers to emit */ | |
421 | r = sd_dhcp_server_set_servers( | |
422 | link->dhcp_server, | |
423 | type, | |
424 | link->network->dhcp_server_emit[type].addresses, | |
425 | link->network->dhcp_server_emit[type].n_addresses); | |
426 | else { | |
427 | /* Emission is requested, but nothing explicitly configured. Let's find a suitable upling */ | |
428 | if (!acquired_uplink) { | |
165d7c5c | 429 | (void) dhcp_server_find_uplink(link, &uplink); |
2a71d57f LP |
430 | acquired_uplink = true; |
431 | } | |
432 | ||
433 | if (uplink && uplink->network) | |
434 | r = link_push_uplink_to_dhcp_server(uplink, type, link->dhcp_server); | |
435 | else if (type == SD_DHCP_LEASE_DNS) | |
436 | r = dhcp4_server_set_dns_from_resolve_conf(link); | |
24e6f458 | 437 | else { |
2a71d57f LP |
438 | log_link_debug(link, |
439 | "Not emitting %s on link, couldn't find suitable uplink.", | |
440 | dhcp_lease_server_type_to_string(type)); | |
441 | continue; | |
24e6f458 | 442 | } |
299d578f | 443 | } |
284e8fd0 | 444 | |
2a71d57f LP |
445 | if (r < 0) |
446 | log_link_warning_errno(link, r, | |
447 | "Failed to set %s for DHCP server, ignoring: %m", | |
448 | dhcp_lease_server_type_to_string(type)); | |
449 | } | |
450 | ||
8fcf1d61 YW |
451 | r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router); |
452 | if (r < 0) | |
a0fa3ef7 | 453 | return log_link_error_errno(link, r, "Failed to set router emission for DHCP server: %m"); |
8fcf1d61 | 454 | |
c95df587 YA |
455 | r = sd_dhcp_server_set_relay_target(link->dhcp_server, &link->network->dhcp_server_relay_target); |
456 | if (r < 0) | |
457 | return log_link_error_errno(link, r, "Failed to set relay target for DHCP server: %m"); | |
458 | ||
11c38d3e YA |
459 | bind_to_interface = sd_dhcp_server_is_in_relay_mode(link->dhcp_server) ? false : link->network->dhcp_server_bind_to_interface; |
460 | r = sd_dhcp_server_set_bind_to_interface(link->dhcp_server, bind_to_interface); | |
461 | if (r < 0) | |
462 | return log_link_error_errno(link, r, "Failed to set interface binding for DHCP server: %m"); | |
463 | ||
464 | r = sd_dhcp_server_set_relay_agent_information(link->dhcp_server, link->network->dhcp_server_relay_agent_circuit_id, link->network->dhcp_server_relay_agent_remote_id); | |
465 | if (r < 0) | |
466 | return log_link_error_errno(link, r, "Failed to set agent circuit/remote id for DHCP server: %m"); | |
467 | ||
8fcf1d61 YW |
468 | if (link->network->dhcp_server_emit_timezone) { |
469 | _cleanup_free_ char *buffer = NULL; | |
7b5018ca | 470 | const char *tz = NULL; |
8fcf1d61 YW |
471 | |
472 | if (link->network->dhcp_server_timezone) | |
473 | tz = link->network->dhcp_server_timezone; | |
474 | else { | |
475 | r = get_timezone(&buffer); | |
476 | if (r < 0) | |
7b5018ca | 477 | log_link_warning_errno(link, r, "Failed to determine timezone, not sending timezone: %m"); |
478 | else | |
479 | tz = buffer; | |
8fcf1d61 YW |
480 | } |
481 | ||
7b5018ca | 482 | if (tz) { |
483 | r = sd_dhcp_server_set_timezone(link->dhcp_server, tz); | |
484 | if (r < 0) | |
485 | return log_link_error_errno(link, r, "Failed to set timezone for DHCP server: %m"); | |
486 | } | |
8fcf1d61 | 487 | } |
564ca984 | 488 | |
90e74a66 | 489 | ORDERED_HASHMAP_FOREACH(p, link->network->dhcp_server_send_options) { |
461dbb2f | 490 | r = sd_dhcp_server_add_option(link->dhcp_server, p); |
564ca984 SS |
491 | if (r == -EEXIST) |
492 | continue; | |
493 | if (r < 0) | |
c00c3b64 | 494 | return log_link_error_errno(link, r, "Failed to set DHCPv4 option: %m"); |
564ca984 SS |
495 | } |
496 | ||
90e74a66 | 497 | ORDERED_HASHMAP_FOREACH(p, link->network->dhcp_server_send_vendor_options) { |
7354900d DW |
498 | r = sd_dhcp_server_add_vendor_option(link->dhcp_server, p); |
499 | if (r == -EEXIST) | |
500 | continue; | |
501 | if (r < 0) | |
502 | return log_link_error_errno(link, r, "Failed to set DHCPv4 option: %m"); | |
503 | } | |
504 | ||
c517a49b | 505 | HASHMAP_FOREACH(static_lease, link->network->dhcp_static_leases_by_section) { |
506 | r = sd_dhcp_server_set_static_lease(link->dhcp_server, &static_lease->address, static_lease->client_id, static_lease->client_id_size); | |
507 | if (r < 0) | |
508 | return log_link_error_errno(link, r, "Failed to set DHCPv4 static lease for DHCP server: %m"); | |
509 | } | |
510 | ||
ab486ef4 YW |
511 | r = sd_dhcp_server_start(link->dhcp_server); |
512 | if (r < 0) | |
513 | return log_link_error_errno(link, r, "Could not start DHCPv4 server instance: %m"); | |
5ae0fb7f | 514 | |
ab486ef4 | 515 | log_link_debug(link, "Offering DHCPv4 leases"); |
8fcf1d61 | 516 | |
1d28a3cf YW |
517 | return 1; |
518 | } | |
519 | ||
520 | int link_request_dhcp_server(Link *link) { | |
521 | assert(link); | |
522 | ||
523 | if (!link_dhcp4_server_enabled(link)) | |
524 | return 0; | |
525 | ||
526 | if (link->dhcp_server) | |
527 | return 0; | |
528 | ||
529 | log_link_debug(link, "Requesting DHCP server."); | |
530 | return link_queue_request(link, REQUEST_TYPE_DHCP_SERVER, NULL, false, NULL, NULL, NULL); | |
531 | } | |
532 | ||
533 | static bool dhcp_server_is_ready_to_configure(Link *link) { | |
165d7c5c | 534 | Link *uplink = NULL; |
1d28a3cf YW |
535 | Address *a; |
536 | ||
537 | assert(link); | |
538 | ||
539 | if (!link->network) | |
540 | return false; | |
541 | ||
542 | if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) | |
543 | return false; | |
544 | ||
baa95d22 YW |
545 | if (link->set_flags_messages > 0) |
546 | return false; | |
547 | ||
1d28a3cf YW |
548 | if (!link_has_carrier(link)) |
549 | return false; | |
550 | ||
1d28a3cf YW |
551 | if (!link->static_addresses_configured) |
552 | return false; | |
553 | ||
554 | if (link_find_dhcp_server_address(link, &a) < 0) | |
555 | return false; | |
556 | ||
557 | if (!address_is_ready(a)) | |
558 | return false; | |
559 | ||
165d7c5c YW |
560 | if (dhcp_server_find_uplink(link, &uplink) < 0) |
561 | return false; | |
562 | ||
563 | if (uplink && !uplink->network) | |
564 | return false; | |
565 | ||
1d28a3cf YW |
566 | return true; |
567 | } | |
568 | ||
569 | int request_process_dhcp_server(Request *req) { | |
570 | assert(req); | |
571 | assert(req->link); | |
572 | assert(req->type == REQUEST_TYPE_DHCP_SERVER); | |
573 | ||
574 | if (!dhcp_server_is_ready_to_configure(req->link)) | |
575 | return 0; | |
576 | ||
577 | return dhcp4_server_configure(req->link); | |
8fcf1d61 YW |
578 | } |
579 | ||
11c38d3e YA |
580 | int config_parse_dhcp_server_relay_agent_suboption( |
581 | const char *unit, | |
582 | const char *filename, | |
583 | unsigned line, | |
584 | const char *section, | |
585 | unsigned section_line, | |
586 | const char *lvalue, | |
587 | int ltype, | |
588 | const char *rvalue, | |
589 | void *data, | |
590 | void *userdata) { | |
591 | ||
592 | char **suboption_value = data; | |
593 | char* p; | |
594 | ||
595 | assert(filename); | |
596 | assert(lvalue); | |
597 | assert(rvalue); | |
598 | ||
11c38d3e YA |
599 | if (isempty(rvalue)) { |
600 | *suboption_value = mfree(*suboption_value); | |
601 | return 0; | |
602 | } | |
603 | ||
604 | p = startswith(rvalue, "string:"); | |
605 | if (!p) { | |
606 | log_syntax(unit, LOG_WARNING, filename, line, 0, | |
607 | "Failed to parse %s=%s'. Invalid format, ignoring.", lvalue, rvalue); | |
608 | return 0; | |
609 | } | |
610 | return free_and_strdup(suboption_value, empty_to_null(p)); | |
611 | } | |
612 | ||
2a71d57f | 613 | int config_parse_dhcp_server_emit( |
8fcf1d61 YW |
614 | const char *unit, |
615 | const char *filename, | |
616 | unsigned line, | |
2a71d57f LP |
617 | const char *section, |
618 | unsigned section_line, | |
8fcf1d61 | 619 | const char *lvalue, |
2a71d57f | 620 | int ltype, |
8fcf1d61 | 621 | const char *rvalue, |
2a71d57f LP |
622 | void *data, |
623 | void *userdata) { | |
8fcf1d61 | 624 | |
2a71d57f LP |
625 | NetworkDHCPServerEmitAddress *emit = data; |
626 | ||
627 | assert(emit); | |
8fcf1d61 YW |
628 | assert(rvalue); |
629 | ||
c1997a5b | 630 | for (const char *p = rvalue;;) { |
8fcf1d61 YW |
631 | _cleanup_free_ char *w = NULL; |
632 | union in_addr_union a; | |
c1997a5b | 633 | int r; |
8fcf1d61 YW |
634 | |
635 | r = extract_first_word(&p, &w, NULL, 0); | |
636 | if (r == -ENOMEM) | |
637 | return log_oom(); | |
638 | if (r < 0) { | |
d96edb2c | 639 | log_syntax(unit, LOG_WARNING, filename, line, r, |
8fcf1d61 YW |
640 | "Failed to extract word, ignoring: %s", rvalue); |
641 | return 0; | |
642 | } | |
643 | if (r == 0) | |
c1997a5b | 644 | return 0; |
8fcf1d61 YW |
645 | |
646 | r = in_addr_from_string(AF_INET, w, &a); | |
647 | if (r < 0) { | |
d96edb2c | 648 | log_syntax(unit, LOG_WARNING, filename, line, r, |
c1997a5b | 649 | "Failed to parse %s= address '%s', ignoring: %m", lvalue, w); |
8fcf1d61 YW |
650 | continue; |
651 | } | |
652 | ||
2a71d57f | 653 | struct in_addr *m = reallocarray(emit->addresses, emit->n_addresses + 1, sizeof(struct in_addr)); |
8fcf1d61 YW |
654 | if (!m) |
655 | return log_oom(); | |
656 | ||
2a71d57f LP |
657 | emit->addresses = m; |
658 | emit->addresses[emit->n_addresses++] = a.in; | |
8fcf1d61 | 659 | } |
8fcf1d61 | 660 | } |
0017ba31 YW |
661 | |
662 | int config_parse_dhcp_server_address( | |
663 | const char *unit, | |
664 | const char *filename, | |
665 | unsigned line, | |
666 | const char *section, | |
667 | unsigned section_line, | |
668 | const char *lvalue, | |
669 | int ltype, | |
670 | const char *rvalue, | |
671 | void *data, | |
672 | void *userdata) { | |
673 | ||
674 | Network *network = userdata; | |
675 | union in_addr_union a; | |
676 | unsigned char prefixlen; | |
677 | int r; | |
678 | ||
679 | assert(filename); | |
680 | assert(lvalue); | |
681 | assert(rvalue); | |
682 | ||
683 | if (isempty(rvalue)) { | |
684 | network->dhcp_server_address = (struct in_addr) {}; | |
685 | network->dhcp_server_address_prefixlen = 0; | |
686 | return 0; | |
687 | } | |
688 | ||
689 | r = in_addr_prefix_from_string(rvalue, AF_INET, &a, &prefixlen); | |
690 | if (r < 0) { | |
691 | log_syntax(unit, LOG_WARNING, filename, line, r, | |
692 | "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue); | |
693 | return 0; | |
694 | } | |
695 | if (in4_addr_is_null(&a.in) || in4_addr_is_localhost(&a.in)) { | |
696 | log_syntax(unit, LOG_WARNING, filename, line, 0, | |
697 | "DHCP server address cannot be the ANY address or a localhost address, " | |
698 | "ignoring assignment: %s", rvalue); | |
699 | return 0; | |
700 | } | |
701 | ||
702 | network->dhcp_server_address = a.in; | |
703 | network->dhcp_server_address_prefixlen = prefixlen; | |
704 | return 0; | |
705 | } |