Line data Source code
1 : /* SPDX-License-Identifier: LGPL-2.1+ */
2 :
3 : #include "sd-dhcp-server.h"
4 :
5 : #include "networkd-dhcp-server.h"
6 : #include "networkd-link.h"
7 : #include "networkd-manager.h"
8 : #include "networkd-network.h"
9 : #include "strv.h"
10 :
11 0 : static Address* link_find_dhcp_server_address(Link *link) {
12 : Address *address;
13 :
14 0 : assert(link);
15 0 : assert(link->network);
16 :
17 : /* The first statically configured address if there is any */
18 0 : LIST_FOREACH(addresses, address, link->network->static_addresses) {
19 :
20 0 : if (address->family != AF_INET)
21 0 : continue;
22 :
23 0 : if (in_addr_is_null(address->family, &address->in_addr))
24 0 : continue;
25 :
26 0 : return address;
27 : }
28 :
29 : /* If that didn't work, find a suitable address we got from the pool */
30 0 : LIST_FOREACH(addresses, address, link->pool_addresses) {
31 0 : if (address->family != AF_INET)
32 0 : continue;
33 :
34 0 : return address;
35 : }
36 :
37 0 : return NULL;
38 : }
39 :
40 0 : static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
41 0 : _cleanup_free_ struct in_addr *addresses = NULL;
42 0 : size_t n_addresses = 0, n_allocated = 0;
43 : unsigned i;
44 :
45 0 : log_debug("Copying DNS server information from %s", link->ifname);
46 :
47 0 : if (!link->network)
48 0 : return 0;
49 :
50 0 : for (i = 0; i < link->network->n_dns; i++) {
51 : struct in_addr ia;
52 :
53 : /* Only look for IPv4 addresses */
54 0 : if (link->network->dns[i].family != AF_INET)
55 0 : continue;
56 :
57 0 : ia = link->network->dns[i].address.in;
58 :
59 : /* Never propagate obviously borked data */
60 0 : if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
61 0 : continue;
62 :
63 0 : if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
64 0 : return log_oom();
65 :
66 0 : addresses[n_addresses++] = ia;
67 : }
68 :
69 0 : if (link->network->dhcp_use_dns && link->dhcp_lease) {
70 0 : const struct in_addr *da = NULL;
71 : int j, n;
72 :
73 0 : n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
74 0 : if (n > 0) {
75 :
76 0 : if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
77 0 : return log_oom();
78 :
79 0 : for (j = 0; j < n; j++)
80 0 : if (in4_addr_is_non_local(&da[j]))
81 0 : addresses[n_addresses++] = da[j];
82 : }
83 : }
84 :
85 0 : if (n_addresses <= 0)
86 0 : return 0;
87 :
88 0 : return sd_dhcp_server_set_dns(s, addresses, n_addresses);
89 : }
90 :
91 0 : static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
92 0 : _cleanup_free_ struct in_addr *addresses = NULL;
93 0 : size_t n_addresses = 0, n_allocated = 0;
94 : char **a;
95 :
96 0 : if (!link->network)
97 0 : return 0;
98 :
99 0 : log_debug("Copying NTP server information from %s", link->ifname);
100 :
101 0 : STRV_FOREACH(a, link->network->ntp) {
102 : union in_addr_union ia;
103 :
104 : /* Only look for IPv4 addresses */
105 0 : if (in_addr_from_string(AF_INET, *a, &ia) <= 0)
106 0 : continue;
107 :
108 : /* Never propagate obviously borked data */
109 0 : if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
110 0 : continue;
111 :
112 0 : if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
113 0 : return log_oom();
114 :
115 0 : addresses[n_addresses++] = ia.in;
116 : }
117 :
118 0 : if (link->network->dhcp_use_ntp && link->dhcp_lease) {
119 0 : const struct in_addr *da = NULL;
120 : int j, n;
121 :
122 0 : n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
123 0 : if (n > 0) {
124 :
125 0 : if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
126 0 : return log_oom();
127 :
128 0 : for (j = 0; j < n; j++)
129 0 : if (in4_addr_is_non_local(&da[j]))
130 0 : addresses[n_addresses++] = da[j];
131 : }
132 : }
133 :
134 0 : if (n_addresses <= 0)
135 0 : return 0;
136 :
137 0 : return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
138 : }
139 :
140 0 : int dhcp4_server_configure(Link *link) {
141 : Address *address;
142 0 : Link *uplink = NULL;
143 0 : bool acquired_uplink = false;
144 : int r;
145 :
146 0 : address = link_find_dhcp_server_address(link);
147 0 : if (!address)
148 0 : return log_link_warning_errno(link, SYNTHETIC_ERRNO(EBUSY),
149 : "Failed to find suitable address for DHCPv4 server instance.");
150 :
151 : /* use the server address' subnet as the pool */
152 0 : r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
153 0 : link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
154 0 : if (r < 0)
155 0 : return r;
156 :
157 : /* TODO:
158 : r = sd_dhcp_server_set_router(link->dhcp_server, &main_address->in_addr.in);
159 : if (r < 0)
160 : return r;
161 : */
162 :
163 0 : if (link->network->dhcp_server_max_lease_time_usec > 0) {
164 0 : r = sd_dhcp_server_set_max_lease_time(link->dhcp_server,
165 0 : DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
166 0 : if (r < 0)
167 0 : return r;
168 : }
169 :
170 0 : if (link->network->dhcp_server_default_lease_time_usec > 0) {
171 0 : r = sd_dhcp_server_set_default_lease_time(link->dhcp_server,
172 0 : DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
173 0 : if (r < 0)
174 0 : return r;
175 : }
176 :
177 0 : if (link->network->dhcp_server_emit_dns) {
178 0 : if (link->network->n_dhcp_server_dns > 0)
179 0 : r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
180 : else {
181 0 : uplink = manager_find_uplink(link->manager, link);
182 0 : acquired_uplink = true;
183 :
184 0 : if (!uplink) {
185 0 : log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
186 0 : r = 0;
187 : } else
188 0 : r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
189 : }
190 0 : if (r < 0)
191 0 : log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
192 : }
193 :
194 0 : if (link->network->dhcp_server_emit_ntp) {
195 0 : if (link->network->n_dhcp_server_ntp > 0)
196 0 : r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
197 : else {
198 0 : if (!acquired_uplink)
199 0 : uplink = manager_find_uplink(link->manager, link);
200 :
201 0 : if (!uplink) {
202 0 : log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
203 0 : r = 0;
204 : } else
205 0 : r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
206 :
207 : }
208 0 : if (r < 0)
209 0 : log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
210 : }
211 :
212 0 : r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
213 0 : if (r < 0)
214 0 : return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
215 :
216 0 : if (link->network->dhcp_server_emit_timezone) {
217 0 : _cleanup_free_ char *buffer = NULL;
218 : const char *tz;
219 :
220 0 : if (link->network->dhcp_server_timezone)
221 0 : tz = link->network->dhcp_server_timezone;
222 : else {
223 0 : r = get_timezone(&buffer);
224 0 : if (r < 0)
225 0 : return log_warning_errno(r, "Failed to determine timezone: %m");
226 :
227 0 : tz = buffer;
228 : }
229 :
230 0 : r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
231 0 : if (r < 0)
232 0 : return r;
233 : }
234 0 : if (!sd_dhcp_server_is_running(link->dhcp_server)) {
235 0 : r = sd_dhcp_server_start(link->dhcp_server);
236 0 : if (r < 0)
237 0 : return log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
238 : }
239 :
240 0 : return 0;
241 : }
242 :
243 0 : int config_parse_dhcp_server_dns(
244 : const char *unit,
245 : const char *filename,
246 : unsigned line,
247 : const char *section,
248 : unsigned section_line,
249 : const char *lvalue,
250 : int ltype,
251 : const char *rvalue,
252 : void *data,
253 : void *userdata) {
254 :
255 0 : Network *n = data;
256 0 : const char *p = rvalue;
257 : int r;
258 :
259 0 : assert(filename);
260 0 : assert(lvalue);
261 0 : assert(rvalue);
262 :
263 0 : for (;;) {
264 0 : _cleanup_free_ char *w = NULL;
265 : union in_addr_union a;
266 : struct in_addr *m;
267 :
268 0 : r = extract_first_word(&p, &w, NULL, 0);
269 0 : if (r == -ENOMEM)
270 0 : return log_oom();
271 0 : if (r < 0) {
272 0 : log_syntax(unit, LOG_ERR, filename, line, r,
273 : "Failed to extract word, ignoring: %s", rvalue);
274 0 : return 0;
275 : }
276 0 : if (r == 0)
277 0 : break;
278 :
279 0 : r = in_addr_from_string(AF_INET, w, &a);
280 0 : if (r < 0) {
281 0 : log_syntax(unit, LOG_ERR, filename, line, r,
282 : "Failed to parse DNS server address '%s', ignoring assignment: %m", w);
283 0 : continue;
284 : }
285 :
286 0 : m = reallocarray(n->dhcp_server_dns, n->n_dhcp_server_dns + 1, sizeof(struct in_addr));
287 0 : if (!m)
288 0 : return log_oom();
289 :
290 0 : m[n->n_dhcp_server_dns++] = a.in;
291 0 : n->dhcp_server_dns = m;
292 : }
293 :
294 0 : return 0;
295 : }
296 :
297 0 : int config_parse_dhcp_server_ntp(
298 : const char *unit,
299 : const char *filename,
300 : unsigned line,
301 : const char *section,
302 : unsigned section_line,
303 : const char *lvalue,
304 : int ltype,
305 : const char *rvalue,
306 : void *data,
307 : void *userdata) {
308 :
309 0 : Network *n = data;
310 0 : const char *p = rvalue;
311 : int r;
312 :
313 0 : assert(filename);
314 0 : assert(lvalue);
315 0 : assert(rvalue);
316 :
317 0 : for (;;) {
318 0 : _cleanup_free_ char *w = NULL;
319 : union in_addr_union a;
320 : struct in_addr *m;
321 :
322 0 : r = extract_first_word(&p, &w, NULL, 0);
323 0 : if (r == -ENOMEM)
324 0 : return log_oom();
325 0 : if (r < 0) {
326 0 : log_syntax(unit, LOG_ERR, filename, line, r,
327 : "Failed to extract word, ignoring: %s", rvalue);
328 0 : return 0;
329 : }
330 0 : if (r == 0)
331 0 : return 0;
332 :
333 0 : r = in_addr_from_string(AF_INET, w, &a);
334 0 : if (r < 0) {
335 0 : log_syntax(unit, LOG_ERR, filename, line, r,
336 : "Failed to parse NTP server address '%s', ignoring: %m", w);
337 0 : continue;
338 : }
339 :
340 0 : m = reallocarray(n->dhcp_server_ntp, n->n_dhcp_server_ntp + 1, sizeof(struct in_addr));
341 0 : if (!m)
342 0 : return log_oom();
343 :
344 0 : m[n->n_dhcp_server_ntp++] = a.in;
345 0 : n->dhcp_server_ntp = m;
346 : }
347 : }
|
