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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ | |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | Copyright 2014 Tom Gundersen | |
8 | ||
9 | systemd is free software; you can redistribute it and/or modify it | |
10 | under the terms of the GNU Lesser General Public License as published by | |
11 | the Free Software Foundation; either version 2.1 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | systemd is distributed in the hope that it will be useful, but | |
15 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | Lesser General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU Lesser General Public License | |
20 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
21 | ***/ | |
22 | ||
23 | #include <errno.h> | |
24 | #include <poll.h> | |
25 | #include <string.h> | |
26 | #include <sys/inotify.h> | |
27 | ||
28 | #include "sd-network.h" | |
29 | ||
30 | #include "fileio.h" | |
31 | #include "macro.h" | |
32 | #include "string-util.h" | |
33 | #include "strv.h" | |
34 | #include "util.h" | |
35 | #include "fd-util.h" | |
36 | #include "parse-util.h" | |
37 | ||
38 | _public_ int sd_network_get_operational_state(char **state) { | |
39 | _cleanup_free_ char *s = NULL; | |
40 | int r; | |
41 | ||
42 | assert_return(state, -EINVAL); | |
43 | ||
44 | r = parse_env_file("/run/systemd/netif/state", NEWLINE, "OPER_STATE", &s, NULL); | |
45 | if (r == -ENOENT) | |
46 | return -ENODATA; | |
47 | if (r < 0) | |
48 | return r; | |
49 | if (isempty(s)) | |
50 | return -ENODATA; | |
51 | ||
52 | *state = s; | |
53 | s = NULL; | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | static int network_get_strv(const char *key, char ***ret) { | |
59 | _cleanup_strv_free_ char **a = NULL; | |
60 | _cleanup_free_ char *s = NULL; | |
61 | int r; | |
62 | ||
63 | assert_return(ret, -EINVAL); | |
64 | ||
65 | r = parse_env_file("/run/systemd/netif/state", NEWLINE, key, &s, NULL); | |
66 | if (r == -ENOENT) | |
67 | return -ENODATA; | |
68 | if (r < 0) | |
69 | return r; | |
70 | if (isempty(s)) { | |
71 | *ret = NULL; | |
72 | return 0; | |
73 | } | |
74 | ||
75 | a = strv_split(s, " "); | |
76 | if (!a) | |
77 | return -ENOMEM; | |
78 | ||
79 | strv_uniq(a); | |
80 | r = strv_length(a); | |
81 | ||
82 | *ret = a; | |
83 | a = NULL; | |
84 | ||
85 | return r; | |
86 | } | |
87 | ||
88 | _public_ int sd_network_get_dns(char ***ret) { | |
89 | return network_get_strv("DNS", ret); | |
90 | } | |
91 | ||
92 | _public_ int sd_network_get_ntp(char ***ret) { | |
93 | return network_get_strv("NTP", ret); | |
94 | } | |
95 | ||
96 | _public_ int sd_network_get_domains(char ***ret) { | |
97 | return network_get_strv("DOMAINS", ret); | |
98 | } | |
99 | ||
100 | _public_ int sd_network_link_get_setup_state(int ifindex, char **state) { | |
101 | _cleanup_free_ char *s = NULL, *p = NULL; | |
102 | int r; | |
103 | ||
104 | assert_return(ifindex > 0, -EINVAL); | |
105 | assert_return(state, -EINVAL); | |
106 | ||
107 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) | |
108 | return -ENOMEM; | |
109 | ||
110 | r = parse_env_file(p, NEWLINE, "ADMIN_STATE", &s, NULL); | |
111 | if (r == -ENOENT) | |
112 | return -ENODATA; | |
113 | if (r < 0) | |
114 | return r; | |
115 | if (isempty(s)) | |
116 | return -ENODATA; | |
117 | ||
118 | *state = s; | |
119 | s = NULL; | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | _public_ int sd_network_link_get_network_file(int ifindex, char **filename) { | |
125 | _cleanup_free_ char *s = NULL, *p = NULL; | |
126 | int r; | |
127 | ||
128 | assert_return(ifindex > 0, -EINVAL); | |
129 | assert_return(filename, -EINVAL); | |
130 | ||
131 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) | |
132 | return -ENOMEM; | |
133 | ||
134 | r = parse_env_file(p, NEWLINE, "NETWORK_FILE", &s, NULL); | |
135 | if (r == -ENOENT) | |
136 | return -ENODATA; | |
137 | if (r < 0) | |
138 | return r; | |
139 | if (isempty(s)) | |
140 | return -ENODATA; | |
141 | ||
142 | *filename = s; | |
143 | s = NULL; | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | _public_ int sd_network_link_get_operational_state(int ifindex, char **state) { | |
149 | _cleanup_free_ char *s = NULL, *p = NULL; | |
150 | int r; | |
151 | ||
152 | assert_return(ifindex > 0, -EINVAL); | |
153 | assert_return(state, -EINVAL); | |
154 | ||
155 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) | |
156 | return -ENOMEM; | |
157 | ||
158 | r = parse_env_file(p, NEWLINE, "OPER_STATE", &s, NULL); | |
159 | if (r == -ENOENT) | |
160 | return -ENODATA; | |
161 | if (r < 0) | |
162 | return r; | |
163 | if (isempty(s)) | |
164 | return -ENODATA; | |
165 | ||
166 | *state = s; | |
167 | s = NULL; | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | _public_ int sd_network_link_get_llmnr(int ifindex, char **llmnr) { | |
173 | _cleanup_free_ char *s = NULL, *p = NULL; | |
174 | int r; | |
175 | ||
176 | assert_return(ifindex > 0, -EINVAL); | |
177 | assert_return(llmnr, -EINVAL); | |
178 | ||
179 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) | |
180 | return -ENOMEM; | |
181 | ||
182 | r = parse_env_file(p, NEWLINE, "LLMNR", &s, NULL); | |
183 | if (r == -ENOENT) | |
184 | return -ENODATA; | |
185 | if (r < 0) | |
186 | return r; | |
187 | if (isempty(s)) | |
188 | return -ENODATA; | |
189 | ||
190 | *llmnr = s; | |
191 | s = NULL; | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | _public_ int sd_network_link_get_lldp(int ifindex, char **lldp) { | |
197 | _cleanup_free_ char *s = NULL, *p = NULL; | |
198 | size_t size; | |
199 | int r; | |
200 | ||
201 | assert_return(ifindex > 0, -EINVAL); | |
202 | assert_return(lldp, -EINVAL); | |
203 | ||
204 | if (asprintf(&p, "/run/systemd/netif/lldp/%d", ifindex) < 0) | |
205 | return -ENOMEM; | |
206 | ||
207 | r = read_full_file(p, &s, &size); | |
208 | if (r == -ENOENT) | |
209 | return -ENODATA; | |
210 | if (r < 0) | |
211 | return r; | |
212 | if (size <= 0) | |
213 | return -ENODATA; | |
214 | ||
215 | *lldp = s; | |
216 | s = NULL; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | int sd_network_link_get_timezone(int ifindex, char **ret) { | |
222 | _cleanup_free_ char *s = NULL, *p = NULL; | |
223 | int r; | |
224 | ||
225 | assert_return(ifindex > 0, -EINVAL); | |
226 | assert_return(ret, -EINVAL); | |
227 | ||
228 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) | |
229 | return -ENOMEM; | |
230 | ||
231 | r = parse_env_file(p, NEWLINE, "TIMEZONE", &s, NULL); | |
232 | if (r == -ENOENT) | |
233 | return -ENODATA; | |
234 | if (r < 0) | |
235 | return r; | |
236 | if (isempty(s)) | |
237 | return -ENODATA; | |
238 | ||
239 | *ret = s; | |
240 | s = NULL; | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static int network_get_link_strv(const char *key, int ifindex, char ***ret) { | |
245 | _cleanup_free_ char *p = NULL, *s = NULL; | |
246 | _cleanup_strv_free_ char **a = NULL; | |
247 | int r; | |
248 | ||
249 | assert_return(ifindex > 0, -EINVAL); | |
250 | assert_return(ret, -EINVAL); | |
251 | ||
252 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) | |
253 | return -ENOMEM; | |
254 | ||
255 | r = parse_env_file(p, NEWLINE, key, &s, NULL); | |
256 | if (r == -ENOENT) | |
257 | return -ENODATA; | |
258 | if (r < 0) | |
259 | return r; | |
260 | if (isempty(s)) { | |
261 | *ret = NULL; | |
262 | return 0; | |
263 | } | |
264 | ||
265 | a = strv_split(s, " "); | |
266 | if (!a) | |
267 | return -ENOMEM; | |
268 | ||
269 | strv_uniq(a); | |
270 | r = strv_length(a); | |
271 | ||
272 | *ret = a; | |
273 | a = NULL; | |
274 | ||
275 | return r; | |
276 | } | |
277 | ||
278 | _public_ int sd_network_link_get_dns(int ifindex, char ***ret) { | |
279 | return network_get_link_strv("DNS", ifindex, ret); | |
280 | } | |
281 | ||
282 | _public_ int sd_network_link_get_ntp(int ifindex, char ***ret) { | |
283 | return network_get_link_strv("NTP", ifindex, ret); | |
284 | } | |
285 | ||
286 | _public_ int sd_network_link_get_domains(int ifindex, char ***ret) { | |
287 | return network_get_link_strv("DOMAINS", ifindex, ret); | |
288 | } | |
289 | ||
290 | _public_ int sd_network_link_get_carrier_bound_to(int ifindex, char ***ret) { | |
291 | return network_get_link_strv("CARRIER_BOUND_TO", ifindex, ret); | |
292 | } | |
293 | ||
294 | _public_ int sd_network_link_get_carrier_bound_by(int ifindex, char ***ret) { | |
295 | return network_get_link_strv("CARRIER_BOUND_BY", ifindex, ret); | |
296 | } | |
297 | ||
298 | _public_ int sd_network_link_get_wildcard_domain(int ifindex) { | |
299 | int r; | |
300 | _cleanup_free_ char *p = NULL, *s = NULL; | |
301 | ||
302 | assert_return(ifindex > 0, -EINVAL); | |
303 | ||
304 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) | |
305 | return -ENOMEM; | |
306 | ||
307 | r = parse_env_file(p, NEWLINE, "WILDCARD_DOMAIN", &s, NULL); | |
308 | if (r == -ENOENT) | |
309 | return -ENODATA; | |
310 | if (r < 0) | |
311 | return r; | |
312 | if (isempty(s)) | |
313 | return -ENODATA; | |
314 | ||
315 | return parse_boolean(s); | |
316 | } | |
317 | ||
318 | static inline int MONITOR_TO_FD(sd_network_monitor *m) { | |
319 | return (int) (unsigned long) m - 1; | |
320 | } | |
321 | ||
322 | static inline sd_network_monitor* FD_TO_MONITOR(int fd) { | |
323 | return (sd_network_monitor*) (unsigned long) (fd + 1); | |
324 | } | |
325 | ||
326 | static int monitor_add_inotify_watch(int fd) { | |
327 | int k; | |
328 | ||
329 | k = inotify_add_watch(fd, "/run/systemd/netif/links/", IN_MOVED_TO|IN_DELETE); | |
330 | if (k >= 0) | |
331 | return 0; | |
332 | else if (errno != ENOENT) | |
333 | return -errno; | |
334 | ||
335 | k = inotify_add_watch(fd, "/run/systemd/netif/", IN_CREATE|IN_ISDIR); | |
336 | if (k >= 0) | |
337 | return 0; | |
338 | else if (errno != ENOENT) | |
339 | return -errno; | |
340 | ||
341 | k = inotify_add_watch(fd, "/run/systemd/", IN_CREATE|IN_ISDIR); | |
342 | if (k < 0) | |
343 | return -errno; | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
348 | _public_ int sd_network_monitor_new(sd_network_monitor **m, const char *category) { | |
349 | _cleanup_close_ int fd = -1; | |
350 | int k; | |
351 | bool good = false; | |
352 | ||
353 | assert_return(m, -EINVAL); | |
354 | ||
355 | fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
356 | if (fd < 0) | |
357 | return -errno; | |
358 | ||
359 | if (!category || streq(category, "links")) { | |
360 | k = monitor_add_inotify_watch(fd); | |
361 | if (k < 0) | |
362 | return k; | |
363 | ||
364 | good = true; | |
365 | } | |
366 | ||
367 | if (!good) | |
368 | return -EINVAL; | |
369 | ||
370 | *m = FD_TO_MONITOR(fd); | |
371 | fd = -1; | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | _public_ sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) { | |
377 | int fd; | |
378 | ||
379 | if (m) { | |
380 | fd = MONITOR_TO_FD(m); | |
381 | close_nointr(fd); | |
382 | } | |
383 | ||
384 | return NULL; | |
385 | } | |
386 | ||
387 | _public_ int sd_network_monitor_flush(sd_network_monitor *m) { | |
388 | union inotify_event_buffer buffer; | |
389 | struct inotify_event *e; | |
390 | ssize_t l; | |
391 | int fd, k; | |
392 | ||
393 | assert_return(m, -EINVAL); | |
394 | ||
395 | fd = MONITOR_TO_FD(m); | |
396 | ||
397 | l = read(fd, &buffer, sizeof(buffer)); | |
398 | if (l < 0) { | |
399 | if (errno == EAGAIN || errno == EINTR) | |
400 | return 0; | |
401 | ||
402 | return -errno; | |
403 | } | |
404 | ||
405 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
406 | if (e->mask & IN_ISDIR) { | |
407 | k = monitor_add_inotify_watch(fd); | |
408 | if (k < 0) | |
409 | return k; | |
410 | ||
411 | k = inotify_rm_watch(fd, e->wd); | |
412 | if (k < 0) | |
413 | return -errno; | |
414 | } | |
415 | } | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | _public_ int sd_network_monitor_get_fd(sd_network_monitor *m) { | |
421 | ||
422 | assert_return(m, -EINVAL); | |
423 | ||
424 | return MONITOR_TO_FD(m); | |
425 | } | |
426 | ||
427 | _public_ int sd_network_monitor_get_events(sd_network_monitor *m) { | |
428 | ||
429 | assert_return(m, -EINVAL); | |
430 | ||
431 | /* For now we will only return POLLIN here, since we don't | |
432 | * need anything else ever for inotify. However, let's have | |
433 | * this API to keep our options open should we later on need | |
434 | * it. */ | |
435 | return POLLIN; | |
436 | } | |
437 | ||
438 | _public_ int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *timeout_usec) { | |
439 | ||
440 | assert_return(m, -EINVAL); | |
441 | assert_return(timeout_usec, -EINVAL); | |
442 | ||
443 | /* For now we will only return (uint64_t) -1, since we don't | |
444 | * need any timeout. However, let's have this API to keep our | |
445 | * options open should we later on need it. */ | |
446 | *timeout_usec = (uint64_t) -1; | |
447 | return 0; | |
448 | } |