1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <errno.h>
4 #include <poll.h>
5 #include <sys/inotify.h>
6
7 #include "sd-network.h"
8
9 #include "alloc-util.h"
10 #include "env-file.h"
11 #include "fd-util.h"
12 #include "fs-util.h"
13 #include "inotify-util.h"
14 #include "macro.h"
15 #include "parse-util.h"
16 #include "stdio-util.h"
17 #include "string-util.h"
18 #include "strv.h"
19 #include "util.h"
20
network_get_string(const char * field,char ** ret)21 static int network_get_string(const char *field, char **ret) {
22 _cleanup_free_ char *s = NULL;
23 int r;
24
25 assert_return(ret, -EINVAL);
26
27 r = parse_env_file(NULL, "/run/systemd/netif/state", field, &s);
28 if (r == -ENOENT)
29 return -ENODATA;
30 if (r < 0)
31 return r;
32 if (isempty(s))
33 return -ENODATA;
34
35 *ret = TAKE_PTR(s);
36
37 return 0;
38 }
39
sd_network_get_operational_state(char ** state)40 int sd_network_get_operational_state(char **state) {
41 return network_get_string("OPER_STATE", state);
42 }
43
sd_network_get_carrier_state(char ** state)44 int sd_network_get_carrier_state(char **state) {
45 return network_get_string("CARRIER_STATE", state);
46 }
47
sd_network_get_address_state(char ** state)48 int sd_network_get_address_state(char **state) {
49 return network_get_string("ADDRESS_STATE", state);
50 }
51
sd_network_get_ipv4_address_state(char ** state)52 int sd_network_get_ipv4_address_state(char **state) {
53 return network_get_string("IPV4_ADDRESS_STATE", state);
54 }
55
sd_network_get_ipv6_address_state(char ** state)56 int sd_network_get_ipv6_address_state(char **state) {
57 return network_get_string("IPV6_ADDRESS_STATE", state);
58 }
59
sd_network_get_online_state(char ** state)60 int sd_network_get_online_state(char **state) {
61 return network_get_string("ONLINE_STATE", state);
62 }
63
network_get_strv(const char * key,char *** ret)64 static int network_get_strv(const char *key, char ***ret) {
65 _cleanup_strv_free_ char **a = NULL;
66 _cleanup_free_ char *s = NULL;
67 int r;
68
69 assert_return(ret, -EINVAL);
70
71 r = parse_env_file(NULL, "/run/systemd/netif/state", key, &s);
72 if (r == -ENOENT)
73 return -ENODATA;
74 if (r < 0)
75 return r;
76 if (isempty(s)) {
77 *ret = NULL;
78 return 0;
79 }
80
81 a = strv_split(s, " ");
82 if (!a)
83 return -ENOMEM;
84
85 strv_uniq(a);
86 r = (int) strv_length(a);
87
88 *ret = TAKE_PTR(a);
89
90 return r;
91 }
92
sd_network_get_dns(char *** ret)93 int sd_network_get_dns(char ***ret) {
94 return network_get_strv("DNS", ret);
95 }
96
sd_network_get_ntp(char *** ret)97 int sd_network_get_ntp(char ***ret) {
98 return network_get_strv("NTP", ret);
99 }
100
sd_network_get_search_domains(char *** ret)101 int sd_network_get_search_domains(char ***ret) {
102 return network_get_strv("DOMAINS", ret);
103 }
104
sd_network_get_route_domains(char *** ret)105 int sd_network_get_route_domains(char ***ret) {
106 return network_get_strv("ROUTE_DOMAINS", ret);
107 }
108
network_link_get_string(int ifindex,const char * field,char ** ret)109 static int network_link_get_string(int ifindex, const char *field, char **ret) {
110 char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex)];
111 _cleanup_free_ char *s = NULL;
112 int r;
113
114 assert_return(ifindex > 0, -EINVAL);
115 assert_return(ret, -EINVAL);
116
117 xsprintf(path, "/run/systemd/netif/links/%i", ifindex);
118
119 r = parse_env_file(NULL, path, field, &s);
120 if (r == -ENOENT)
121 return -ENODATA;
122 if (r < 0)
123 return r;
124 if (isempty(s))
125 return -ENODATA;
126
127 *ret = TAKE_PTR(s);
128
129 return 0;
130 }
131
network_link_get_strv(int ifindex,const char * key,char *** ret)132 static int network_link_get_strv(int ifindex, const char *key, char ***ret) {
133 char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex)];
134 _cleanup_strv_free_ char **a = NULL;
135 _cleanup_free_ char *s = NULL;
136 int r;
137
138 assert_return(ifindex > 0, -EINVAL);
139 assert_return(ret, -EINVAL);
140
141 xsprintf(path, "/run/systemd/netif/links/%i", ifindex);
142 r = parse_env_file(NULL, path, key, &s);
143 if (r == -ENOENT)
144 return -ENODATA;
145 if (r < 0)
146 return r;
147 if (isempty(s)) {
148 *ret = NULL;
149 return 0;
150 }
151
152 a = strv_split(s, " ");
153 if (!a)
154 return -ENOMEM;
155
156 strv_uniq(a);
157 r = (int) strv_length(a);
158
159 *ret = TAKE_PTR(a);
160
161 return r;
162 }
163
sd_network_link_get_setup_state(int ifindex,char ** state)164 int sd_network_link_get_setup_state(int ifindex, char **state) {
165 return network_link_get_string(ifindex, "ADMIN_STATE", state);
166 }
167
sd_network_link_get_network_file(int ifindex,char ** filename)168 int sd_network_link_get_network_file(int ifindex, char **filename) {
169 return network_link_get_string(ifindex, "NETWORK_FILE", filename);
170 }
171
sd_network_link_get_operational_state(int ifindex,char ** state)172 int sd_network_link_get_operational_state(int ifindex, char **state) {
173 return network_link_get_string(ifindex, "OPER_STATE", state);
174 }
175
sd_network_link_get_required_family_for_online(int ifindex,char ** state)176 int sd_network_link_get_required_family_for_online(int ifindex, char **state) {
177 _cleanup_free_ char *s = NULL;
178 int r;
179
180 assert_return(state, -EINVAL);
181
182 r = network_link_get_string(ifindex, "REQUIRED_FAMILY_FOR_ONLINE", &s);
183 if (r < 0) {
184 if (r != -ENODATA)
185 return r;
186
187 s = strdup("any");
188 if (!s)
189 return -ENOMEM;
190 }
191
192 *state = TAKE_PTR(s);
193 return 0;
194 }
195
sd_network_link_get_carrier_state(int ifindex,char ** state)196 int sd_network_link_get_carrier_state(int ifindex, char **state) {
197 return network_link_get_string(ifindex, "CARRIER_STATE", state);
198 }
199
sd_network_link_get_address_state(int ifindex,char ** state)200 int sd_network_link_get_address_state(int ifindex, char **state) {
201 return network_link_get_string(ifindex, "ADDRESS_STATE", state);
202 }
203
sd_network_link_get_ipv4_address_state(int ifindex,char ** state)204 int sd_network_link_get_ipv4_address_state(int ifindex, char **state) {
205 return network_link_get_string(ifindex, "IPV4_ADDRESS_STATE", state);
206 }
207
sd_network_link_get_ipv6_address_state(int ifindex,char ** state)208 int sd_network_link_get_ipv6_address_state(int ifindex, char **state) {
209 return network_link_get_string(ifindex, "IPV6_ADDRESS_STATE", state);
210 }
211
sd_network_link_get_online_state(int ifindex,char ** state)212 int sd_network_link_get_online_state(int ifindex, char **state) {
213 return network_link_get_string(ifindex, "ONLINE_STATE", state);
214 }
215
sd_network_link_get_dhcp6_client_iaid_string(int ifindex,char ** iaid)216 int sd_network_link_get_dhcp6_client_iaid_string(int ifindex, char **iaid) {
217 return network_link_get_string(ifindex, "DHCP6_CLIENT_IAID", iaid);
218 }
219
sd_network_link_get_dhcp6_client_duid_string(int ifindex,char ** duid)220 int sd_network_link_get_dhcp6_client_duid_string(int ifindex, char **duid) {
221 return network_link_get_string(ifindex, "DHCP6_CLIENT_DUID", duid);
222 }
223
sd_network_link_get_required_for_online(int ifindex)224 int sd_network_link_get_required_for_online(int ifindex) {
225 _cleanup_free_ char *s = NULL;
226 int r;
227
228 r = network_link_get_string(ifindex, "REQUIRED_FOR_ONLINE", &s);
229 if (r < 0) {
230 /* Handle -ENODATA as RequiredForOnline=yes, for compatibility */
231 if (r == -ENODATA)
232 return true;
233 return r;
234 }
235
236 return parse_boolean(s);
237 }
238
sd_network_link_get_required_operstate_for_online(int ifindex,char ** state)239 int sd_network_link_get_required_operstate_for_online(int ifindex, char **state) {
240 _cleanup_free_ char *s = NULL;
241 int r;
242
243 assert_return(state, -EINVAL);
244
245 r = network_link_get_string(ifindex, "REQUIRED_OPER_STATE_FOR_ONLINE", &s);
246 if (r < 0) {
247 if (r != -ENODATA)
248 return r;
249
250 /* For compatibility, assuming degraded. */
251 s = strdup("degraded");
252 if (!s)
253 return -ENOMEM;
254 }
255
256 *state = TAKE_PTR(s);
257 return 0;
258 }
259
sd_network_link_get_activation_policy(int ifindex,char ** policy)260 int sd_network_link_get_activation_policy(int ifindex, char **policy) {
261 _cleanup_free_ char *s = NULL;
262 int r;
263
264 assert_return(policy, -EINVAL);
265
266 r = network_link_get_string(ifindex, "ACTIVATION_POLICY", &s);
267 if (r < 0) {
268 if (r != -ENODATA)
269 return r;
270
271 /* For compatibility, assuming up. */
272 s = strdup("up");
273 if (!s)
274 return -ENOMEM;
275 }
276
277 *policy = TAKE_PTR(s);
278 return 0;
279 }
280
sd_network_link_get_llmnr(int ifindex,char ** llmnr)281 int sd_network_link_get_llmnr(int ifindex, char **llmnr) {
282 return network_link_get_string(ifindex, "LLMNR", llmnr);
283 }
284
sd_network_link_get_mdns(int ifindex,char ** mdns)285 int sd_network_link_get_mdns(int ifindex, char **mdns) {
286 return network_link_get_string(ifindex, "MDNS", mdns);
287 }
288
sd_network_link_get_dns_over_tls(int ifindex,char ** dns_over_tls)289 int sd_network_link_get_dns_over_tls(int ifindex, char **dns_over_tls) {
290 return network_link_get_string(ifindex, "DNS_OVER_TLS", dns_over_tls);
291 }
292
sd_network_link_get_dnssec(int ifindex,char ** dnssec)293 int sd_network_link_get_dnssec(int ifindex, char **dnssec) {
294 return network_link_get_string(ifindex, "DNSSEC", dnssec);
295 }
296
sd_network_link_get_dnssec_negative_trust_anchors(int ifindex,char *** nta)297 int sd_network_link_get_dnssec_negative_trust_anchors(int ifindex, char ***nta) {
298 return network_link_get_strv(ifindex, "DNSSEC_NTA", nta);
299 }
300
sd_network_link_get_dns(int ifindex,char *** ret)301 int sd_network_link_get_dns(int ifindex, char ***ret) {
302 return network_link_get_strv(ifindex, "DNS", ret);
303 }
304
sd_network_link_get_ntp(int ifindex,char *** ret)305 int sd_network_link_get_ntp(int ifindex, char ***ret) {
306 return network_link_get_strv(ifindex, "NTP", ret);
307 }
308
sd_network_link_get_sip(int ifindex,char *** ret)309 int sd_network_link_get_sip(int ifindex, char ***ret) {
310 return network_link_get_strv(ifindex, "SIP", ret);
311 }
312
sd_network_link_get_search_domains(int ifindex,char *** ret)313 int sd_network_link_get_search_domains(int ifindex, char ***ret) {
314 return network_link_get_strv(ifindex, "DOMAINS", ret);
315 }
316
sd_network_link_get_route_domains(int ifindex,char *** ret)317 int sd_network_link_get_route_domains(int ifindex, char ***ret) {
318 return network_link_get_strv(ifindex, "ROUTE_DOMAINS", ret);
319 }
320
sd_network_link_get_dns_default_route(int ifindex)321 int sd_network_link_get_dns_default_route(int ifindex) {
322 char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex)];
323 _cleanup_free_ char *s = NULL;
324 int r;
325
326 assert_return(ifindex > 0, -EINVAL);
327
328 xsprintf(path, "/run/systemd/netif/links/%i", ifindex);
329
330 r = parse_env_file(NULL, path, "DNS_DEFAULT_ROUTE", &s);
331 if (r == -ENOENT)
332 return -ENODATA;
333 if (r < 0)
334 return r;
335 if (isempty(s))
336 return -ENODATA;
337 return parse_boolean(s);
338 }
339
network_link_get_ifindexes(int ifindex,const char * key,int ** ret)340 static int network_link_get_ifindexes(int ifindex, const char *key, int **ret) {
341 char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex)];
342 _cleanup_free_ int *ifis = NULL;
343 _cleanup_free_ char *s = NULL;
344 size_t c = 0;
345 int r;
346
347 assert_return(ifindex > 0, -EINVAL);
348 assert_return(ret, -EINVAL);
349
350 xsprintf(path, "/run/systemd/netif/links/%i", ifindex);
351 r = parse_env_file(NULL, path, key, &s);
352 if (r == -ENOENT)
353 return -ENODATA;
354 if (r < 0)
355 return r;
356
357 for (const char *x = s;;) {
358 _cleanup_free_ char *word = NULL;
359
360 r = extract_first_word(&x, &word, NULL, 0);
361 if (r < 0)
362 return r;
363 if (r == 0)
364 break;
365
366 if (!GREEDY_REALLOC(ifis, c + 2))
367 return -ENOMEM;
368
369 r = ifis[c++] = parse_ifindex(word);
370 if (r < 0)
371 return r;
372 }
373
374 if (ifis)
375 ifis[c] = 0; /* Let's add a 0 ifindex to the end, to be nice */
376
377 *ret = TAKE_PTR(ifis);
378
379 return c;
380 }
381
sd_network_link_get_carrier_bound_to(int ifindex,int ** ret)382 int sd_network_link_get_carrier_bound_to(int ifindex, int **ret) {
383 return network_link_get_ifindexes(ifindex, "CARRIER_BOUND_TO", ret);
384 }
385
sd_network_link_get_carrier_bound_by(int ifindex,int ** ret)386 int sd_network_link_get_carrier_bound_by(int ifindex, int **ret) {
387 return network_link_get_ifindexes(ifindex, "CARRIER_BOUND_BY", ret);
388 }
389
sd_network_link_get_stat(int ifindex,struct stat * ret)390 int sd_network_link_get_stat(int ifindex, struct stat *ret) {
391 char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex)];
392 struct stat st;
393
394 assert_return(ifindex > 0, -EINVAL);
395
396 xsprintf(path, "/run/systemd/netif/links/%i", ifindex);
397
398 if (stat(path, &st) < 0)
399 return -errno;
400
401 if (ret)
402 *ret = st;
403
404 return 0;
405 }
406
MONITOR_TO_FD(sd_network_monitor * m)407 static int MONITOR_TO_FD(sd_network_monitor *m) {
408 return (int) (unsigned long) m - 1;
409 }
410
FD_TO_MONITOR(int fd)411 static sd_network_monitor* FD_TO_MONITOR(int fd) {
412 return (sd_network_monitor*) (unsigned long) (fd + 1);
413 }
414
monitor_add_inotify_watch(int fd)415 static int monitor_add_inotify_watch(int fd) {
416 int wd;
417
418 wd = inotify_add_watch(fd, "/run/systemd/netif/links/", IN_MOVED_TO|IN_DELETE);
419 if (wd >= 0)
420 return wd;
421 else if (errno != ENOENT)
422 return -errno;
423
424 wd = inotify_add_watch(fd, "/run/systemd/netif/", IN_CREATE|IN_ISDIR);
425 if (wd >= 0)
426 return wd;
427 else if (errno != ENOENT)
428 return -errno;
429
430 wd = inotify_add_watch(fd, "/run/systemd/", IN_CREATE|IN_ISDIR);
431 if (wd < 0)
432 return -errno;
433
434 return wd;
435 }
436
sd_network_monitor_new(sd_network_monitor ** m,const char * category)437 int sd_network_monitor_new(sd_network_monitor **m, const char *category) {
438 _cleanup_close_ int fd = -1;
439 int k;
440 bool good = false;
441
442 assert_return(m, -EINVAL);
443
444 fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
445 if (fd < 0)
446 return -errno;
447
448 if (!category || streq(category, "links")) {
449 k = monitor_add_inotify_watch(fd);
450 if (k < 0)
451 return k;
452
453 good = true;
454 }
455
456 if (!good)
457 return -EINVAL;
458
459 *m = FD_TO_MONITOR(TAKE_FD(fd));
460 return 0;
461 }
462
sd_network_monitor_unref(sd_network_monitor * m)463 sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) {
464 if (m)
465 (void) close_nointr(MONITOR_TO_FD(m));
466
467 return NULL;
468 }
469
sd_network_monitor_flush(sd_network_monitor * m)470 int sd_network_monitor_flush(sd_network_monitor *m) {
471 union inotify_event_buffer buffer;
472 ssize_t l;
473 int fd;
474
475 assert_return(m, -EINVAL);
476
477 fd = MONITOR_TO_FD(m);
478
479 l = read(fd, &buffer, sizeof(buffer));
480 if (l < 0) {
481 if (ERRNO_IS_TRANSIENT(errno))
482 return 0;
483
484 return -errno;
485 }
486
487 FOREACH_INOTIFY_EVENT(e, buffer, l) {
488 if (e->mask & IN_ISDIR) {
489 int wd;
490
491 wd = monitor_add_inotify_watch(fd);
492 if (wd < 0)
493 return wd;
494
495 if (wd != e->wd) {
496 if (inotify_rm_watch(fd, e->wd) < 0)
497 return -errno;
498 }
499 }
500 }
501
502 return 0;
503 }
504
sd_network_monitor_get_fd(sd_network_monitor * m)505 int sd_network_monitor_get_fd(sd_network_monitor *m) {
506
507 assert_return(m, -EINVAL);
508
509 return MONITOR_TO_FD(m);
510 }
511
sd_network_monitor_get_events(sd_network_monitor * m)512 int sd_network_monitor_get_events(sd_network_monitor *m) {
513
514 assert_return(m, -EINVAL);
515
516 /* For now we will only return POLLIN here, since we don't
517 * need anything else ever for inotify. However, let's have
518 * this API to keep our options open should we later on need
519 * it. */
520 return POLLIN;
521 }
522
sd_network_monitor_get_timeout(sd_network_monitor * m,uint64_t * timeout_usec)523 int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *timeout_usec) {
524
525 assert_return(m, -EINVAL);
526 assert_return(timeout_usec, -EINVAL);
527
528 /* For now we will only return UINT64_MAX, since we don't
529 * need any timeout. However, let's have this API to keep our
530 * options open should we later on need it. */
531 *timeout_usec = UINT64_MAX;
532 return 0;
533 }
534