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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" |
344b3cff | 19 | #include "networkd-route-util.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; | |
bab29f2a YW |
61 | |
62 | if (address->family != AF_INET) | |
63 | continue; | |
64 | ||
65 | if (in4_addr_is_localhost(&address->in_addr.in)) | |
66 | continue; | |
67 | ||
68 | if (in4_addr_is_link_local(&address->in_addr.in)) | |
69 | continue; | |
70 | ||
71 | if (in4_addr_is_set(&address->in_addr_peer.in)) | |
72 | continue; | |
73 | ||
74 | have = true; | |
75 | break; | |
0017ba31 YW |
76 | } |
77 | if (!have) { | |
78 | log_warning("%s: DHCPServer= is enabled, but no static address configured. " | |
79 | "Disabling DHCP server.", | |
80 | network->filename); | |
81 | network->dhcp_server = false; | |
82 | return; | |
83 | } | |
84 | } | |
85 | } | |
86 | ||
3b6a3bde YW |
87 | int link_request_dhcp_server_address(Link *link) { |
88 | _cleanup_(address_freep) Address *address = NULL; | |
89 | Address *existing; | |
90 | int r; | |
91 | ||
92 | assert(link); | |
93 | assert(link->network); | |
94 | ||
95 | if (!link_dhcp4_server_enabled(link)) | |
96 | return 0; | |
97 | ||
98 | if (!in4_addr_is_set(&link->network->dhcp_server_address)) | |
99 | return 0; | |
100 | ||
101 | r = address_new(&address); | |
102 | if (r < 0) | |
103 | return r; | |
104 | ||
105 | address->source = NETWORK_CONFIG_SOURCE_STATIC; | |
106 | address->family = AF_INET; | |
107 | address->in_addr.in = link->network->dhcp_server_address; | |
108 | address->prefixlen = link->network->dhcp_server_address_prefixlen; | |
e680486d | 109 | address_set_broadcast(address, link); |
3b6a3bde YW |
110 | |
111 | if (address_get(link, address, &existing) >= 0 && | |
112 | address_exists(existing) && | |
113 | existing->source == NETWORK_CONFIG_SOURCE_STATIC) | |
114 | /* The same address seems explicitly configured in [Address] or [Network] section. | |
115 | * Configure the DHCP server address only when it is not. */ | |
116 | return 0; | |
117 | ||
118 | return link_request_static_address(link, TAKE_PTR(address), true); | |
119 | } | |
120 | ||
0017ba31 | 121 | static int link_find_dhcp_server_address(Link *link, Address **ret) { |
8fcf1d61 YW |
122 | Address *address; |
123 | ||
124 | assert(link); | |
125 | assert(link->network); | |
126 | ||
0017ba31 YW |
127 | /* If ServerAddress= is specified, then use the address. */ |
128 | if (in4_addr_is_set(&link->network->dhcp_server_address)) | |
129 | return link_get_ipv4_address(link, &link->network->dhcp_server_address, | |
130 | link->network->dhcp_server_address_prefixlen, ret); | |
8fcf1d61 | 131 | |
0017ba31 | 132 | /* If not, then select one from static addresses. */ |
3b6a3bde YW |
133 | SET_FOREACH(address, link->addresses) { |
134 | if (address->source != NETWORK_CONFIG_SOURCE_STATIC) | |
135 | continue; | |
136 | if (!address_exists(address)) | |
137 | continue; | |
138 | if (address->family != AF_INET) | |
139 | continue; | |
140 | if (in4_addr_is_localhost(&address->in_addr.in)) | |
141 | continue; | |
bab29f2a YW |
142 | if (in4_addr_is_link_local(&address->in_addr.in)) |
143 | continue; | |
3b6a3bde YW |
144 | if (in4_addr_is_set(&address->in_addr_peer.in)) |
145 | continue; | |
146 | ||
147 | *ret = address; | |
148 | return 0; | |
149 | } | |
8fcf1d61 | 150 | |
0017ba31 | 151 | return -ENOENT; |
8fcf1d61 YW |
152 | } |
153 | ||
165d7c5c YW |
154 | static int dhcp_server_find_uplink(Link *link, Link **ret) { |
155 | assert(link); | |
156 | ||
157 | if (link->network->dhcp_server_uplink_name) | |
158 | return link_get_by_name(link->manager, link->network->dhcp_server_uplink_name, ret); | |
159 | ||
160 | if (link->network->dhcp_server_uplink_index > 0) | |
6eab614d | 161 | return link_get_by_index(link->manager, link->network->dhcp_server_uplink_index, ret); |
165d7c5c | 162 | |
63295b42 | 163 | if (link->network->dhcp_server_uplink_index == UPLINK_INDEX_AUTO) { |
165d7c5c YW |
164 | /* It is not necessary to propagate error in automatic selection. */ |
165 | if (manager_find_uplink(link->manager, AF_INET, link, ret) < 0) | |
166 | *ret = NULL; | |
167 | return 0; | |
168 | } | |
169 | ||
170 | *ret = NULL; | |
171 | return 0; | |
172 | } | |
173 | ||
2a71d57f LP |
174 | static int link_push_uplink_to_dhcp_server( |
175 | Link *link, | |
2324fd3a | 176 | sd_dhcp_lease_server_type_t what, |
2a71d57f LP |
177 | sd_dhcp_server *s) { |
178 | ||
8fcf1d61 | 179 | _cleanup_free_ struct in_addr *addresses = NULL; |
2a71d57f | 180 | bool use_dhcp_lease_data = true; |
319a4f4b | 181 | size_t n_addresses = 0; |
8fcf1d61 | 182 | |
2a71d57f | 183 | assert(link); |
8fcf1d61 | 184 | |
2a71d57f LP |
185 | if (!link->network) |
186 | return 0; | |
187 | assert(link->network); | |
8fcf1d61 | 188 | |
2a71d57f | 189 | log_link_debug(link, "Copying %s from link", dhcp_lease_server_type_to_string(what)); |
8fcf1d61 | 190 | |
2a71d57f | 191 | switch (what) { |
8fcf1d61 | 192 | |
2a71d57f LP |
193 | case SD_DHCP_LEASE_DNS: |
194 | /* For DNS we have a special case. We the data configured explicitly locally along with the | |
195 | * data from the DHCP lease. */ | |
8fcf1d61 | 196 | |
2a71d57f LP |
197 | for (unsigned i = 0; i < link->network->n_dns; i++) { |
198 | struct in_addr ia; | |
8fcf1d61 | 199 | |
2a71d57f | 200 | /* Only look for IPv4 addresses */ |
e77bd3fd | 201 | if (link->network->dns[i]->family != AF_INET) |
2a71d57f | 202 | continue; |
8fcf1d61 | 203 | |
e77bd3fd | 204 | ia = link->network->dns[i]->address.in; |
2a71d57f LP |
205 | |
206 | /* Never propagate obviously borked data */ | |
207 | if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia)) | |
208 | continue; | |
209 | ||
319a4f4b | 210 | if (!GREEDY_REALLOC(addresses, n_addresses + 1)) |
8fcf1d61 YW |
211 | return log_oom(); |
212 | ||
2a71d57f | 213 | addresses[n_addresses++] = ia; |
8fcf1d61 | 214 | } |
8fcf1d61 | 215 | |
2a71d57f LP |
216 | use_dhcp_lease_data = link->network->dhcp_use_dns; |
217 | break; | |
8fcf1d61 | 218 | |
2a71d57f | 219 | case SD_DHCP_LEASE_NTP: { |
2a71d57f LP |
220 | /* For NTP things are similar, but for NTP hostnames can be configured too, which we cannot |
221 | * propagate via DHCP. Hence let's only propagate those which are IP addresses. */ | |
284e8fd0 | 222 | |
2a71d57f LP |
223 | STRV_FOREACH(i, link->network->ntp) { |
224 | union in_addr_union ia; | |
284e8fd0 | 225 | |
2a71d57f LP |
226 | if (in_addr_from_string(AF_INET, *i, &ia) < 0) |
227 | continue; | |
284e8fd0 | 228 | |
2a71d57f LP |
229 | /* Never propagate obviously borked data */ |
230 | if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in)) | |
231 | continue; | |
284e8fd0 | 232 | |
319a4f4b | 233 | if (!GREEDY_REALLOC(addresses, n_addresses + 1)) |
2a71d57f | 234 | return log_oom(); |
284e8fd0 | 235 | |
2a71d57f LP |
236 | addresses[n_addresses++] = ia.in; |
237 | } | |
284e8fd0 | 238 | |
2a71d57f | 239 | use_dhcp_lease_data = link->network->dhcp_use_ntp; |
24e6f458 | 240 | break; |
2a71d57f | 241 | } |
284e8fd0 | 242 | |
ddb82ec2 | 243 | case SD_DHCP_LEASE_SIP: |
2a71d57f LP |
244 | |
245 | /* For SIP we don't allow explicit, local configuration, but there's control whether to use the data */ | |
246 | use_dhcp_lease_data = link->network->dhcp_use_sip; | |
24e6f458 | 247 | break; |
284e8fd0 | 248 | |
2a71d57f LP |
249 | case SD_DHCP_LEASE_POP3: |
250 | case SD_DHCP_LEASE_SMTP: | |
ddb82ec2 | 251 | case SD_DHCP_LEASE_LPR: |
2a71d57f LP |
252 | /* For the other server types we currently do not allow local configuration of server data, |
253 | * since there are typically no local consumers of the data. */ | |
c4e585a3 | 254 | break; |
d361b373 | 255 | |
24e6f458 | 256 | default: |
04499a70 | 257 | assert_not_reached(); |
f6269fe7 SS |
258 | } |
259 | ||
2a71d57f | 260 | if (use_dhcp_lease_data && link->dhcp_lease) { |
24e6f458 | 261 | const struct in_addr *da; |
f6269fe7 | 262 | |
a2706075 | 263 | int n = sd_dhcp_lease_get_servers(link->dhcp_lease, what, &da); |
f6269fe7 | 264 | if (n > 0) { |
319a4f4b | 265 | if (!GREEDY_REALLOC(addresses, n_addresses + n)) |
f6269fe7 SS |
266 | return log_oom(); |
267 | ||
2a71d57f LP |
268 | for (int j = 0; j < n; j++) |
269 | if (in4_addr_is_non_local(&da[j])) | |
270 | addresses[n_addresses++] = da[j]; | |
f6269fe7 SS |
271 | } |
272 | } | |
273 | ||
274 | if (n_addresses <= 0) | |
275 | return 0; | |
276 | ||
24e6f458 | 277 | return sd_dhcp_server_set_servers(s, what, addresses, n_addresses); |
299d578f SS |
278 | } |
279 | ||
319a4f4b LP |
280 | static int dhcp4_server_parse_dns_server_string_and_warn( |
281 | const char *string, | |
282 | struct in_addr **addresses, | |
283 | size_t *n_addresses) { | |
284 | ||
dd1d3060 MAL |
285 | for (;;) { |
286 | _cleanup_free_ char *word = NULL, *server_name = NULL; | |
287 | union in_addr_union address; | |
288 | int family, r, ifindex = 0; | |
289 | ||
290 | r = extract_first_word(&string, &word, NULL, 0); | |
291 | if (r < 0) | |
292 | return r; | |
293 | if (r == 0) | |
294 | break; | |
295 | ||
296 | r = in_addr_ifindex_name_from_string_auto(word, &family, &address, &ifindex, &server_name); | |
297 | if (r < 0) { | |
298 | log_warning_errno(r, "Failed to parse DNS server address '%s', ignoring: %m", word); | |
299 | continue; | |
300 | } | |
301 | ||
302 | /* Only look for IPv4 addresses */ | |
303 | if (family != AF_INET) | |
304 | continue; | |
305 | ||
306 | /* Never propagate obviously borked data */ | |
307 | if (in4_addr_is_null(&address.in) || in4_addr_is_localhost(&address.in)) | |
308 | continue; | |
309 | ||
319a4f4b | 310 | if (!GREEDY_REALLOC(*addresses, *n_addresses + 1)) |
dd1d3060 MAL |
311 | return log_oom(); |
312 | ||
313 | (*addresses)[(*n_addresses)++] = address.in; | |
314 | } | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | static int dhcp4_server_set_dns_from_resolve_conf(Link *link) { | |
320 | _cleanup_free_ struct in_addr *addresses = NULL; | |
dd1d3060 | 321 | _cleanup_fclose_ FILE *f = NULL; |
319a4f4b | 322 | size_t n_addresses = 0; |
f8769631 | 323 | int r; |
dd1d3060 MAL |
324 | |
325 | f = fopen(PRIVATE_UPLINK_RESOLV_CONF, "re"); | |
326 | if (!f) { | |
327 | if (errno == ENOENT) | |
328 | return 0; | |
329 | ||
330 | return log_warning_errno(errno, "Failed to open " PRIVATE_UPLINK_RESOLV_CONF ": %m"); | |
331 | } | |
332 | ||
333 | for (;;) { | |
334 | _cleanup_free_ char *line = NULL; | |
335 | const char *a; | |
336 | char *l; | |
337 | ||
338 | r = read_line(f, LONG_LINE_MAX, &line); | |
339 | if (r < 0) | |
340 | return log_error_errno(r, "Failed to read " PRIVATE_UPLINK_RESOLV_CONF ": %m"); | |
341 | if (r == 0) | |
342 | break; | |
343 | ||
dd1d3060 MAL |
344 | l = strstrip(line); |
345 | if (IN_SET(*l, '#', ';', 0)) | |
346 | continue; | |
347 | ||
348 | a = first_word(l, "nameserver"); | |
349 | if (!a) | |
350 | continue; | |
351 | ||
319a4f4b | 352 | r = dhcp4_server_parse_dns_server_string_and_warn(a, &addresses, &n_addresses); |
dd1d3060 MAL |
353 | if (r < 0) |
354 | log_warning_errno(r, "Failed to parse DNS server address '%s', ignoring.", a); | |
355 | } | |
356 | ||
357 | if (n_addresses <= 0) | |
358 | return 0; | |
359 | ||
360 | return sd_dhcp_server_set_dns(link->dhcp_server, addresses, n_addresses); | |
361 | } | |
362 | ||
1d28a3cf | 363 | static int dhcp4_server_configure(Link *link) { |
8fcf1d61 | 364 | bool acquired_uplink = false; |
461dbb2f | 365 | sd_dhcp_option *p; |
c517a49b | 366 | DHCPStaticLease *static_lease; |
564ca984 SS |
367 | Link *uplink = NULL; |
368 | Address *address; | |
11c38d3e | 369 | bool bind_to_interface; |
8fcf1d61 YW |
370 | int r; |
371 | ||
5ae0fb7f YW |
372 | assert(link); |
373 | ||
1d28a3cf | 374 | log_link_debug(link, "Configuring DHCP Server."); |
5ae0fb7f | 375 | |
1d28a3cf YW |
376 | if (link->dhcp_server) |
377 | return -EBUSY; | |
5ae0fb7f | 378 | |
1d28a3cf YW |
379 | r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex); |
380 | if (r < 0) | |
381 | return r; | |
5ae0fb7f | 382 | |
1d28a3cf YW |
383 | r = sd_dhcp_server_attach_event(link->dhcp_server, link->manager->event, 0); |
384 | if (r < 0) | |
385 | return r; | |
5ae0fb7f | 386 | |
a95e9306 LK |
387 | r = sd_dhcp_server_set_callback(link->dhcp_server, dhcp_server_callback, link); |
388 | if (r < 0) | |
389 | return log_link_warning_errno(link, r, "Failed to set callback for DHCPv4 server instance: %m"); | |
390 | ||
0017ba31 YW |
391 | r = link_find_dhcp_server_address(link, &address); |
392 | if (r < 0) | |
393 | return log_link_error_errno(link, r, "Failed to find suitable address for DHCPv4 server instance: %m"); | |
8fcf1d61 YW |
394 | |
395 | /* use the server address' subnet as the pool */ | |
396 | r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen, | |
397 | link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size); | |
398 | if (r < 0) | |
c00c3b64 | 399 | return log_link_error_errno(link, r, "Failed to configure address pool for DHCPv4 server instance: %m"); |
8fcf1d61 | 400 | |
8fcf1d61 YW |
401 | if (link->network->dhcp_server_max_lease_time_usec > 0) { |
402 | r = sd_dhcp_server_set_max_lease_time(link->dhcp_server, | |
403 | DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC)); | |
404 | if (r < 0) | |
c00c3b64 | 405 | return log_link_error_errno(link, r, "Failed to set maximum lease time for DHCPv4 server instance: %m"); |
8fcf1d61 YW |
406 | } |
407 | ||
408 | if (link->network->dhcp_server_default_lease_time_usec > 0) { | |
409 | r = sd_dhcp_server_set_default_lease_time(link->dhcp_server, | |
410 | DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC)); | |
411 | if (r < 0) | |
c00c3b64 | 412 | return log_link_error_errno(link, r, "Failed to set default lease time for DHCPv4 server instance: %m"); |
8fcf1d61 YW |
413 | } |
414 | ||
6278e428 | 415 | r = sd_dhcp_server_set_boot_server_address(link->dhcp_server, &link->network->dhcp_server_boot_server_address); |
369ac192 | 416 | if (r < 0) |
6278e428 | 417 | return log_link_warning_errno(link, r, "Failed to set boot server address for DHCPv4 server instance: %m"); |
369ac192 | 418 | |
6278e428 | 419 | r = sd_dhcp_server_set_boot_server_name(link->dhcp_server, link->network->dhcp_server_boot_server_name); |
369ac192 | 420 | if (r < 0) |
6278e428 YW |
421 | return log_link_warning_errno(link, r, "Failed to set boot server name for DHCPv4 server instance: %m"); |
422 | ||
423 | r = sd_dhcp_server_set_boot_filename(link->dhcp_server, link->network->dhcp_server_boot_filename); | |
424 | if (r < 0) | |
425 | return log_link_warning_errno(link, r, "Failed to set boot filename for DHCPv4 server instance: %m"); | |
369ac192 | 426 | |
2324fd3a | 427 | for (sd_dhcp_lease_server_type_t type = 0; type < _SD_DHCP_LEASE_SERVER_TYPE_MAX; type ++) { |
2a71d57f LP |
428 | |
429 | if (!link->network->dhcp_server_emit[type].emit) | |
430 | continue; | |
431 | ||
432 | if (link->network->dhcp_server_emit[type].n_addresses > 0) | |
433 | /* Explicitly specified servers to emit */ | |
434 | r = sd_dhcp_server_set_servers( | |
435 | link->dhcp_server, | |
436 | type, | |
437 | link->network->dhcp_server_emit[type].addresses, | |
438 | link->network->dhcp_server_emit[type].n_addresses); | |
439 | else { | |
440 | /* Emission is requested, but nothing explicitly configured. Let's find a suitable upling */ | |
441 | if (!acquired_uplink) { | |
165d7c5c | 442 | (void) dhcp_server_find_uplink(link, &uplink); |
2a71d57f LP |
443 | acquired_uplink = true; |
444 | } | |
445 | ||
446 | if (uplink && uplink->network) | |
447 | r = link_push_uplink_to_dhcp_server(uplink, type, link->dhcp_server); | |
448 | else if (type == SD_DHCP_LEASE_DNS) | |
449 | r = dhcp4_server_set_dns_from_resolve_conf(link); | |
24e6f458 | 450 | else { |
2a71d57f LP |
451 | log_link_debug(link, |
452 | "Not emitting %s on link, couldn't find suitable uplink.", | |
453 | dhcp_lease_server_type_to_string(type)); | |
454 | continue; | |
24e6f458 | 455 | } |
299d578f | 456 | } |
284e8fd0 | 457 | |
2a71d57f LP |
458 | if (r < 0) |
459 | log_link_warning_errno(link, r, | |
460 | "Failed to set %s for DHCP server, ignoring: %m", | |
461 | dhcp_lease_server_type_to_string(type)); | |
462 | } | |
463 | ||
59aa6220 YW |
464 | if (link->network->dhcp_server_emit_router) { |
465 | r = sd_dhcp_server_set_router(link->dhcp_server, &link->network->dhcp_server_router); | |
466 | if (r < 0) | |
467 | return log_link_error_errno(link, r, "Failed to set router address for DHCP server: %m"); | |
468 | } | |
8fcf1d61 | 469 | |
c95df587 YA |
470 | r = sd_dhcp_server_set_relay_target(link->dhcp_server, &link->network->dhcp_server_relay_target); |
471 | if (r < 0) | |
472 | return log_link_error_errno(link, r, "Failed to set relay target for DHCP server: %m"); | |
473 | ||
11c38d3e YA |
474 | bind_to_interface = sd_dhcp_server_is_in_relay_mode(link->dhcp_server) ? false : link->network->dhcp_server_bind_to_interface; |
475 | r = sd_dhcp_server_set_bind_to_interface(link->dhcp_server, bind_to_interface); | |
476 | if (r < 0) | |
477 | return log_link_error_errno(link, r, "Failed to set interface binding for DHCP server: %m"); | |
478 | ||
479 | 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); | |
480 | if (r < 0) | |
481 | return log_link_error_errno(link, r, "Failed to set agent circuit/remote id for DHCP server: %m"); | |
482 | ||
8fcf1d61 YW |
483 | if (link->network->dhcp_server_emit_timezone) { |
484 | _cleanup_free_ char *buffer = NULL; | |
7b5018ca | 485 | const char *tz = NULL; |
8fcf1d61 YW |
486 | |
487 | if (link->network->dhcp_server_timezone) | |
488 | tz = link->network->dhcp_server_timezone; | |
489 | else { | |
490 | r = get_timezone(&buffer); | |
491 | if (r < 0) | |
7b5018ca | 492 | log_link_warning_errno(link, r, "Failed to determine timezone, not sending timezone: %m"); |
493 | else | |
494 | tz = buffer; | |
8fcf1d61 YW |
495 | } |
496 | ||
7b5018ca | 497 | if (tz) { |
498 | r = sd_dhcp_server_set_timezone(link->dhcp_server, tz); | |
499 | if (r < 0) | |
500 | return log_link_error_errno(link, r, "Failed to set timezone for DHCP server: %m"); | |
501 | } | |
8fcf1d61 | 502 | } |
564ca984 | 503 | |
90e74a66 | 504 | ORDERED_HASHMAP_FOREACH(p, link->network->dhcp_server_send_options) { |
461dbb2f | 505 | r = sd_dhcp_server_add_option(link->dhcp_server, p); |
564ca984 SS |
506 | if (r == -EEXIST) |
507 | continue; | |
508 | if (r < 0) | |
c00c3b64 | 509 | return log_link_error_errno(link, r, "Failed to set DHCPv4 option: %m"); |
564ca984 SS |
510 | } |
511 | ||
90e74a66 | 512 | ORDERED_HASHMAP_FOREACH(p, link->network->dhcp_server_send_vendor_options) { |
7354900d DW |
513 | r = sd_dhcp_server_add_vendor_option(link->dhcp_server, p); |
514 | if (r == -EEXIST) | |
515 | continue; | |
516 | if (r < 0) | |
517 | return log_link_error_errno(link, r, "Failed to set DHCPv4 option: %m"); | |
518 | } | |
519 | ||
c517a49b | 520 | HASHMAP_FOREACH(static_lease, link->network->dhcp_static_leases_by_section) { |
521 | r = sd_dhcp_server_set_static_lease(link->dhcp_server, &static_lease->address, static_lease->client_id, static_lease->client_id_size); | |
522 | if (r < 0) | |
523 | return log_link_error_errno(link, r, "Failed to set DHCPv4 static lease for DHCP server: %m"); | |
524 | } | |
525 | ||
ab486ef4 YW |
526 | r = sd_dhcp_server_start(link->dhcp_server); |
527 | if (r < 0) | |
528 | return log_link_error_errno(link, r, "Could not start DHCPv4 server instance: %m"); | |
5ae0fb7f | 529 | |
ab486ef4 | 530 | log_link_debug(link, "Offering DHCPv4 leases"); |
745f0620 | 531 | return 0; |
1d28a3cf YW |
532 | } |
533 | ||
1d28a3cf | 534 | static bool dhcp_server_is_ready_to_configure(Link *link) { |
165d7c5c | 535 | Link *uplink = NULL; |
1d28a3cf YW |
536 | Address *a; |
537 | ||
538 | assert(link); | |
539 | ||
4b482e8b | 540 | if (!link_is_ready_to_configure(link, /* allow_unmanaged = */ false)) |
baa95d22 YW |
541 | return false; |
542 | ||
1d28a3cf YW |
543 | if (!link_has_carrier(link)) |
544 | return false; | |
545 | ||
1d28a3cf YW |
546 | if (!link->static_addresses_configured) |
547 | return false; | |
548 | ||
549 | if (link_find_dhcp_server_address(link, &a) < 0) | |
550 | return false; | |
551 | ||
552 | if (!address_is_ready(a)) | |
553 | return false; | |
554 | ||
165d7c5c YW |
555 | if (dhcp_server_find_uplink(link, &uplink) < 0) |
556 | return false; | |
557 | ||
558 | if (uplink && !uplink->network) | |
559 | return false; | |
560 | ||
1d28a3cf YW |
561 | return true; |
562 | } | |
563 | ||
09d09207 | 564 | static int dhcp_server_process_request(Request *req, Link *link, void *userdata) { |
745f0620 YW |
565 | int r; |
566 | ||
ff51134c | 567 | assert(link); |
1d28a3cf | 568 | |
745f0620 | 569 | if (!dhcp_server_is_ready_to_configure(link)) |
1d28a3cf YW |
570 | return 0; |
571 | ||
745f0620 YW |
572 | r = dhcp4_server_configure(link); |
573 | if (r < 0) | |
574 | return log_link_warning_errno(link, r, "Failed to configure DHCP server: %m"); | |
575 | ||
576 | return 1; | |
8fcf1d61 YW |
577 | } |
578 | ||
8bed7c55 | 579 | int link_request_dhcp_server(Link *link) { |
745f0620 YW |
580 | int r; |
581 | ||
8bed7c55 YW |
582 | assert(link); |
583 | ||
584 | if (!link_dhcp4_server_enabled(link)) | |
585 | return 0; | |
586 | ||
587 | if (link->dhcp_server) | |
588 | return 0; | |
589 | ||
590 | log_link_debug(link, "Requesting DHCP server."); | |
09d09207 | 591 | r = link_queue_request(link, REQUEST_TYPE_DHCP_SERVER, dhcp_server_process_request, NULL); |
745f0620 YW |
592 | if (r < 0) |
593 | return log_link_warning_errno(link, r, "Failed to request configuration of DHCP server: %m"); | |
594 | ||
595 | return 0; | |
8bed7c55 YW |
596 | } |
597 | ||
11c38d3e YA |
598 | int config_parse_dhcp_server_relay_agent_suboption( |
599 | const char *unit, | |
600 | const char *filename, | |
601 | unsigned line, | |
602 | const char *section, | |
603 | unsigned section_line, | |
604 | const char *lvalue, | |
605 | int ltype, | |
606 | const char *rvalue, | |
607 | void *data, | |
608 | void *userdata) { | |
609 | ||
610 | char **suboption_value = data; | |
611 | char* p; | |
612 | ||
613 | assert(filename); | |
614 | assert(lvalue); | |
615 | assert(rvalue); | |
616 | ||
11c38d3e YA |
617 | if (isempty(rvalue)) { |
618 | *suboption_value = mfree(*suboption_value); | |
619 | return 0; | |
620 | } | |
621 | ||
622 | p = startswith(rvalue, "string:"); | |
623 | if (!p) { | |
624 | log_syntax(unit, LOG_WARNING, filename, line, 0, | |
625 | "Failed to parse %s=%s'. Invalid format, ignoring.", lvalue, rvalue); | |
626 | return 0; | |
627 | } | |
628 | return free_and_strdup(suboption_value, empty_to_null(p)); | |
629 | } | |
630 | ||
2a71d57f | 631 | int config_parse_dhcp_server_emit( |
8fcf1d61 YW |
632 | const char *unit, |
633 | const char *filename, | |
634 | unsigned line, | |
2a71d57f LP |
635 | const char *section, |
636 | unsigned section_line, | |
8fcf1d61 | 637 | const char *lvalue, |
2a71d57f | 638 | int ltype, |
8fcf1d61 | 639 | const char *rvalue, |
2a71d57f LP |
640 | void *data, |
641 | void *userdata) { | |
8fcf1d61 | 642 | |
2a71d57f LP |
643 | NetworkDHCPServerEmitAddress *emit = data; |
644 | ||
645 | assert(emit); | |
8fcf1d61 YW |
646 | assert(rvalue); |
647 | ||
faa1b3c6 YW |
648 | if (isempty(rvalue)) { |
649 | emit->addresses = mfree(emit->addresses); | |
650 | emit->n_addresses = 0; | |
651 | return 0; | |
652 | } | |
653 | ||
c1997a5b | 654 | for (const char *p = rvalue;;) { |
8fcf1d61 YW |
655 | _cleanup_free_ char *w = NULL; |
656 | union in_addr_union a; | |
c1997a5b | 657 | int r; |
8fcf1d61 YW |
658 | |
659 | r = extract_first_word(&p, &w, NULL, 0); | |
660 | if (r == -ENOMEM) | |
661 | return log_oom(); | |
662 | if (r < 0) { | |
d96edb2c | 663 | log_syntax(unit, LOG_WARNING, filename, line, r, |
8fcf1d61 YW |
664 | "Failed to extract word, ignoring: %s", rvalue); |
665 | return 0; | |
666 | } | |
667 | if (r == 0) | |
c1997a5b | 668 | return 0; |
8fcf1d61 | 669 | |
5f468b9f YW |
670 | if (streq(w, "_server_address")) |
671 | a = IN_ADDR_NULL; /* null address will be converted to the server address. */ | |
672 | else { | |
673 | r = in_addr_from_string(AF_INET, w, &a); | |
674 | if (r < 0) { | |
675 | log_syntax(unit, LOG_WARNING, filename, line, r, | |
676 | "Failed to parse %s= address '%s', ignoring: %m", lvalue, w); | |
677 | continue; | |
678 | } | |
679 | ||
680 | if (in4_addr_is_null(&a.in)) { | |
681 | log_syntax(unit, LOG_WARNING, filename, line, 0, | |
682 | "Found a null address in %s=, ignoring.", lvalue); | |
683 | continue; | |
684 | } | |
8fcf1d61 YW |
685 | } |
686 | ||
77e73102 | 687 | if (!GREEDY_REALLOC(emit->addresses, emit->n_addresses + 1)) |
8fcf1d61 YW |
688 | return log_oom(); |
689 | ||
2a71d57f | 690 | emit->addresses[emit->n_addresses++] = a.in; |
8fcf1d61 | 691 | } |
8fcf1d61 | 692 | } |
0017ba31 YW |
693 | |
694 | int config_parse_dhcp_server_address( | |
695 | const char *unit, | |
696 | const char *filename, | |
697 | unsigned line, | |
698 | const char *section, | |
699 | unsigned section_line, | |
700 | const char *lvalue, | |
701 | int ltype, | |
702 | const char *rvalue, | |
703 | void *data, | |
704 | void *userdata) { | |
705 | ||
6278e428 | 706 | Network *network = ASSERT_PTR(userdata); |
0017ba31 YW |
707 | union in_addr_union a; |
708 | unsigned char prefixlen; | |
709 | int r; | |
710 | ||
711 | assert(filename); | |
712 | assert(lvalue); | |
713 | assert(rvalue); | |
714 | ||
715 | if (isempty(rvalue)) { | |
716 | network->dhcp_server_address = (struct in_addr) {}; | |
717 | network->dhcp_server_address_prefixlen = 0; | |
718 | return 0; | |
719 | } | |
720 | ||
721 | r = in_addr_prefix_from_string(rvalue, AF_INET, &a, &prefixlen); | |
722 | if (r < 0) { | |
723 | log_syntax(unit, LOG_WARNING, filename, line, r, | |
724 | "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue); | |
725 | return 0; | |
726 | } | |
727 | if (in4_addr_is_null(&a.in) || in4_addr_is_localhost(&a.in)) { | |
728 | log_syntax(unit, LOG_WARNING, filename, line, 0, | |
729 | "DHCP server address cannot be the ANY address or a localhost address, " | |
730 | "ignoring assignment: %s", rvalue); | |
731 | return 0; | |
732 | } | |
733 | ||
734 | network->dhcp_server_address = a.in; | |
735 | network->dhcp_server_address_prefixlen = prefixlen; | |
736 | return 0; | |
737 | } |