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Commit | Line | Data |
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fe8db0c5 TG |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2011 Lennart Poettering | |
5 | Copyright 2014 Tom Gundersen | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
fe8db0c5 | 21 | #include <errno.h> |
0a6f50c0 | 22 | #include <poll.h> |
07630cea LP |
23 | #include <string.h> |
24 | #include <sys/inotify.h> | |
fe8db0c5 | 25 | |
07630cea LP |
26 | #include "sd-network.h" |
27 | ||
b5efdb8a | 28 | #include "alloc-util.h" |
77601719 | 29 | #include "fd-util.h" |
07630cea | 30 | #include "fileio.h" |
77601719 | 31 | #include "fs-util.h" |
fe8db0c5 | 32 | #include "macro.h" |
77601719 | 33 | #include "parse-util.h" |
07630cea | 34 | #include "string-util.h" |
fe8db0c5 | 35 | #include "strv.h" |
07630cea | 36 | #include "util.h" |
fe8db0c5 | 37 | |
03cc0fd1 LP |
38 | _public_ int sd_network_get_operational_state(char **state) { |
39 | _cleanup_free_ char *s = NULL; | |
deb2e523 TG |
40 | int r; |
41 | ||
fe8db0c5 TG |
42 | assert_return(state, -EINVAL); |
43 | ||
03cc0fd1 | 44 | r = parse_env_file("/run/systemd/netif/state", NEWLINE, "OPER_STATE", &s, NULL); |
cb6fa44c TG |
45 | if (r == -ENOENT) |
46 | return -ENODATA; | |
03cc0fd1 | 47 | if (r < 0) |
fe8db0c5 | 48 | return r; |
03cc0fd1 LP |
49 | if (isempty(s)) |
50 | return -ENODATA; | |
deb2e523 TG |
51 | |
52 | *state = s; | |
53 | s = NULL; | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
03cc0fd1 LP |
58 | static int network_get_strv(const char *key, char ***ret) { |
59 | _cleanup_strv_free_ char **a = NULL; | |
bbf7c048 TG |
60 | _cleanup_free_ char *s = NULL; |
61 | int r; | |
62 | ||
03cc0fd1 LP |
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 | ||
3df9bec5 | 96 | _public_ int sd_network_get_search_domains(char ***ret) { |
8612e936 LP |
97 | return network_get_strv("DOMAINS", ret); |
98 | } | |
99 | ||
3df9bec5 LP |
100 | _public_ int sd_network_get_route_domains(char ***ret) { |
101 | return network_get_strv("ROUTE_DOMAINS", ret); | |
102 | } | |
103 | ||
38e5900f | 104 | static int network_link_get_string(int ifindex, const char *field, char **ret) { |
03cc0fd1 LP |
105 | _cleanup_free_ char *s = NULL, *p = NULL; |
106 | int r; | |
107 | ||
108 | assert_return(ifindex > 0, -EINVAL); | |
38e5900f | 109 | assert_return(ret, -EINVAL); |
bbf7c048 | 110 | |
38e5900f | 111 | if (asprintf(&p, "/run/systemd/netif/links/%i", ifindex) < 0) |
03cc0fd1 LP |
112 | return -ENOMEM; |
113 | ||
38e5900f | 114 | r = parse_env_file(p, NEWLINE, field, &s, NULL); |
bbf7c048 TG |
115 | if (r == -ENOENT) |
116 | return -ENODATA; | |
03cc0fd1 | 117 | if (r < 0) |
bbf7c048 | 118 | return r; |
03cc0fd1 LP |
119 | if (isempty(s)) |
120 | return -ENODATA; | |
bbf7c048 | 121 | |
38e5900f | 122 | *ret = s; |
bbf7c048 TG |
123 | s = NULL; |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
8a516214 LP |
128 | static int network_link_get_strv(int ifindex, const char *key, char ***ret) { |
129 | _cleanup_free_ char *p = NULL, *s = NULL; | |
130 | _cleanup_strv_free_ char **a = NULL; | |
131 | int r; | |
132 | ||
133 | assert_return(ifindex > 0, -EINVAL); | |
134 | assert_return(ret, -EINVAL); | |
135 | ||
136 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) | |
137 | return -ENOMEM; | |
138 | ||
139 | r = parse_env_file(p, NEWLINE, key, &s, NULL); | |
140 | if (r == -ENOENT) | |
141 | return -ENODATA; | |
142 | if (r < 0) | |
143 | return r; | |
144 | if (isempty(s)) { | |
145 | *ret = NULL; | |
146 | return 0; | |
147 | } | |
148 | ||
149 | a = strv_split(s, " "); | |
150 | if (!a) | |
151 | return -ENOMEM; | |
152 | ||
153 | strv_uniq(a); | |
154 | r = strv_length(a); | |
155 | ||
156 | *ret = a; | |
157 | a = NULL; | |
158 | ||
159 | return r; | |
160 | } | |
161 | ||
38e5900f LP |
162 | _public_ int sd_network_link_get_setup_state(int ifindex, char **state) { |
163 | return network_link_get_string(ifindex, "ADMIN_STATE", state); | |
164 | } | |
adc5b2e2 | 165 | |
38e5900f LP |
166 | _public_ int sd_network_link_get_network_file(int ifindex, char **filename) { |
167 | return network_link_get_string(ifindex, "NETWORK_FILE", filename); | |
adc5b2e2 TG |
168 | } |
169 | ||
d6731e4c | 170 | _public_ int sd_network_link_get_operational_state(int ifindex, char **state) { |
38e5900f | 171 | return network_link_get_string(ifindex, "OPER_STATE", state); |
fe8db0c5 TG |
172 | } |
173 | ||
d6731e4c | 174 | _public_ int sd_network_link_get_llmnr(int ifindex, char **llmnr) { |
38e5900f | 175 | return network_link_get_string(ifindex, "LLMNR", llmnr); |
bd8f6538 TG |
176 | } |
177 | ||
aaa297d4 LP |
178 | _public_ int sd_network_link_get_mdns(int ifindex, char **mdns) { |
179 | return network_link_get_string(ifindex, "MDNS", mdns); | |
180 | } | |
181 | ||
ad6c0475 LP |
182 | _public_ int sd_network_link_get_dnssec(int ifindex, char **dnssec) { |
183 | return network_link_get_string(ifindex, "DNSSEC", dnssec); | |
184 | } | |
185 | ||
8a516214 LP |
186 | _public_ int sd_network_link_get_dnssec_negative_trust_anchors(int ifindex, char ***nta) { |
187 | return network_link_get_strv(ifindex, "DNSSEC_NTA", nta); | |
188 | } | |
189 | ||
49699bac SS |
190 | _public_ int sd_network_link_get_lldp(int ifindex, char **lldp) { |
191 | _cleanup_free_ char *s = NULL, *p = NULL; | |
192 | size_t size; | |
193 | int r; | |
194 | ||
195 | assert_return(ifindex > 0, -EINVAL); | |
196 | assert_return(lldp, -EINVAL); | |
197 | ||
198 | if (asprintf(&p, "/run/systemd/netif/lldp/%d", ifindex) < 0) | |
199 | return -ENOMEM; | |
200 | ||
201 | r = read_full_file(p, &s, &size); | |
202 | if (r == -ENOENT) | |
203 | return -ENODATA; | |
204 | if (r < 0) | |
205 | return r; | |
206 | if (size <= 0) | |
207 | return -ENODATA; | |
208 | ||
209 | *lldp = s; | |
210 | s = NULL; | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
8eb9058d | 215 | int sd_network_link_get_timezone(int ifindex, char **ret) { |
38e5900f | 216 | return network_link_get_string(ifindex, "TIMEZONE", ret); |
8eb9058d | 217 | } |
49699bac | 218 | |
d6731e4c | 219 | _public_ int sd_network_link_get_dns(int ifindex, char ***ret) { |
8a516214 | 220 | return network_link_get_strv(ifindex, "DNS", ret); |
bcb7a07e TG |
221 | } |
222 | ||
d6731e4c | 223 | _public_ int sd_network_link_get_ntp(int ifindex, char ***ret) { |
8a516214 | 224 | return network_link_get_strv(ifindex, "NTP", ret); |
bcb7a07e TG |
225 | } |
226 | ||
3df9bec5 | 227 | _public_ int sd_network_link_get_search_domains(int ifindex, char ***ret) { |
8a516214 | 228 | return network_link_get_strv(ifindex, "DOMAINS", ret); |
9b4d1882 TG |
229 | } |
230 | ||
3df9bec5 LP |
231 | _public_ int sd_network_link_get_route_domains(int ifindex, char ***ret) { |
232 | return network_link_get_strv(ifindex, "ROUTE_DOMAINS", ret); | |
233 | } | |
234 | ||
0d4ad91d | 235 | _public_ int sd_network_link_get_carrier_bound_to(int ifindex, char ***ret) { |
8a516214 | 236 | return network_link_get_strv(ifindex, "CARRIER_BOUND_TO", ret); |
0d4ad91d AR |
237 | } |
238 | ||
239 | _public_ int sd_network_link_get_carrier_bound_by(int ifindex, char ***ret) { | |
8a516214 | 240 | return network_link_get_strv(ifindex, "CARRIER_BOUND_BY", ret); |
0d4ad91d AR |
241 | } |
242 | ||
fe8db0c5 TG |
243 | static inline int MONITOR_TO_FD(sd_network_monitor *m) { |
244 | return (int) (unsigned long) m - 1; | |
245 | } | |
246 | ||
247 | static inline sd_network_monitor* FD_TO_MONITOR(int fd) { | |
248 | return (sd_network_monitor*) (unsigned long) (fd + 1); | |
249 | } | |
250 | ||
870395a4 TG |
251 | static int monitor_add_inotify_watch(int fd) { |
252 | int k; | |
253 | ||
254 | k = inotify_add_watch(fd, "/run/systemd/netif/links/", IN_MOVED_TO|IN_DELETE); | |
255 | if (k >= 0) | |
256 | return 0; | |
257 | else if (errno != ENOENT) | |
258 | return -errno; | |
259 | ||
260 | k = inotify_add_watch(fd, "/run/systemd/netif/", IN_CREATE|IN_ISDIR); | |
261 | if (k >= 0) | |
262 | return 0; | |
263 | else if (errno != ENOENT) | |
264 | return -errno; | |
265 | ||
266 | k = inotify_add_watch(fd, "/run/systemd/", IN_CREATE|IN_ISDIR); | |
267 | if (k < 0) | |
268 | return -errno; | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
0014a4ad | 273 | _public_ int sd_network_monitor_new(sd_network_monitor **m, const char *category) { |
870395a4 TG |
274 | _cleanup_close_ int fd = -1; |
275 | int k; | |
fe8db0c5 TG |
276 | bool good = false; |
277 | ||
278 | assert_return(m, -EINVAL); | |
279 | ||
280 | fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
281 | if (fd < 0) | |
282 | return -errno; | |
283 | ||
7e141e49 | 284 | if (!category || streq(category, "links")) { |
870395a4 TG |
285 | k = monitor_add_inotify_watch(fd); |
286 | if (k < 0) | |
287 | return k; | |
fe8db0c5 TG |
288 | |
289 | good = true; | |
290 | } | |
291 | ||
3de1c8ce | 292 | if (!good) |
fe8db0c5 | 293 | return -EINVAL; |
fe8db0c5 TG |
294 | |
295 | *m = FD_TO_MONITOR(fd); | |
870395a4 TG |
296 | fd = -1; |
297 | ||
fe8db0c5 TG |
298 | return 0; |
299 | } | |
300 | ||
301 | _public_ sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) { | |
302 | int fd; | |
303 | ||
0b347626 TG |
304 | if (m) { |
305 | fd = MONITOR_TO_FD(m); | |
306 | close_nointr(fd); | |
307 | } | |
fe8db0c5 TG |
308 | |
309 | return NULL; | |
310 | } | |
311 | ||
312 | _public_ int sd_network_monitor_flush(sd_network_monitor *m) { | |
870395a4 TG |
313 | union inotify_event_buffer buffer; |
314 | struct inotify_event *e; | |
315 | ssize_t l; | |
316 | int fd, k; | |
fe8db0c5 TG |
317 | |
318 | assert_return(m, -EINVAL); | |
319 | ||
870395a4 TG |
320 | fd = MONITOR_TO_FD(m); |
321 | ||
322 | l = read(fd, &buffer, sizeof(buffer)); | |
323 | if (l < 0) { | |
324 | if (errno == EAGAIN || errno == EINTR) | |
325 | return 0; | |
326 | ||
327 | return -errno; | |
328 | } | |
329 | ||
330 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
331 | if (e->mask & IN_ISDIR) { | |
332 | k = monitor_add_inotify_watch(fd); | |
333 | if (k < 0) | |
334 | return k; | |
335 | ||
336 | k = inotify_rm_watch(fd, e->wd); | |
337 | if (k < 0) | |
338 | return -errno; | |
339 | } | |
340 | } | |
341 | ||
342 | return 0; | |
fe8db0c5 TG |
343 | } |
344 | ||
345 | _public_ int sd_network_monitor_get_fd(sd_network_monitor *m) { | |
346 | ||
347 | assert_return(m, -EINVAL); | |
348 | ||
349 | return MONITOR_TO_FD(m); | |
350 | } | |
351 | ||
352 | _public_ int sd_network_monitor_get_events(sd_network_monitor *m) { | |
353 | ||
354 | assert_return(m, -EINVAL); | |
355 | ||
356 | /* For now we will only return POLLIN here, since we don't | |
357 | * need anything else ever for inotify. However, let's have | |
358 | * this API to keep our options open should we later on need | |
359 | * it. */ | |
360 | return POLLIN; | |
361 | } | |
362 | ||
363 | _public_ int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *timeout_usec) { | |
364 | ||
365 | assert_return(m, -EINVAL); | |
366 | assert_return(timeout_usec, -EINVAL); | |
367 | ||
368 | /* For now we will only return (uint64_t) -1, since we don't | |
369 | * need any timeout. However, let's have this API to keep our | |
370 | * options open should we later on need it. */ | |
371 | *timeout_usec = (uint64_t) -1; | |
372 | return 0; | |
373 | } |