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5eef597e MP |
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 <unistd.h> | |
24 | #include <string.h> | |
25 | #include <errno.h> | |
26 | #include <sys/inotify.h> | |
e735f4d4 | 27 | #include <poll.h> |
5eef597e MP |
28 | #include <net/if.h> |
29 | ||
30 | #include "util.h" | |
31 | #include "macro.h" | |
32 | #include "strv.h" | |
33 | #include "fileio.h" | |
34 | #include "sd-network.h" | |
35 | #include "network-internal.h" | |
36 | ||
37 | _public_ int sd_network_get_operational_state(char **state) { | |
38 | _cleanup_free_ char *s = NULL; | |
39 | int r; | |
40 | ||
41 | assert_return(state, -EINVAL); | |
42 | ||
43 | r = parse_env_file("/run/systemd/netif/state", NEWLINE, "OPER_STATE", &s, NULL); | |
44 | if (r == -ENOENT) | |
45 | return -ENODATA; | |
46 | if (r < 0) | |
47 | return r; | |
48 | if (isempty(s)) | |
49 | return -ENODATA; | |
50 | ||
51 | *state = s; | |
52 | s = NULL; | |
53 | ||
54 | return 0; | |
55 | } | |
56 | ||
57 | static int network_get_strv(const char *key, char ***ret) { | |
58 | _cleanup_strv_free_ char **a = NULL; | |
59 | _cleanup_free_ char *s = NULL; | |
60 | int r; | |
61 | ||
62 | assert_return(ret, -EINVAL); | |
63 | ||
64 | r = parse_env_file("/run/systemd/netif/state", NEWLINE, key, &s, NULL); | |
65 | if (r == -ENOENT) | |
66 | return -ENODATA; | |
67 | if (r < 0) | |
68 | return r; | |
69 | if (isempty(s)) { | |
70 | *ret = NULL; | |
71 | return 0; | |
72 | } | |
73 | ||
74 | a = strv_split(s, " "); | |
75 | if (!a) | |
76 | return -ENOMEM; | |
77 | ||
78 | strv_uniq(a); | |
79 | r = strv_length(a); | |
80 | ||
81 | *ret = a; | |
82 | a = NULL; | |
83 | ||
84 | return r; | |
85 | } | |
86 | ||
87 | _public_ int sd_network_get_dns(char ***ret) { | |
88 | return network_get_strv("DNS", ret); | |
89 | } | |
90 | ||
91 | _public_ int sd_network_get_ntp(char ***ret) { | |
92 | return network_get_strv("NTP", ret); | |
93 | } | |
94 | ||
95 | _public_ int sd_network_get_domains(char ***ret) { | |
96 | return network_get_strv("DOMAINS", ret); | |
97 | } | |
98 | ||
99 | _public_ int sd_network_link_get_setup_state(int ifindex, char **state) { | |
100 | _cleanup_free_ char *s = NULL, *p = NULL; | |
101 | int r; | |
102 | ||
103 | assert_return(ifindex > 0, -EINVAL); | |
104 | assert_return(state, -EINVAL); | |
105 | ||
106 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) | |
107 | return -ENOMEM; | |
108 | ||
109 | r = parse_env_file(p, NEWLINE, "ADMIN_STATE", &s, NULL); | |
110 | if (r == -ENOENT) | |
111 | return -ENODATA; | |
112 | if (r < 0) | |
113 | return r; | |
114 | if (isempty(s)) | |
115 | return -ENODATA; | |
116 | ||
117 | *state = s; | |
118 | s = NULL; | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | _public_ int sd_network_link_get_network_file(int ifindex, char **filename) { | |
124 | _cleanup_free_ char *s = NULL, *p = NULL; | |
125 | int r; | |
126 | ||
127 | assert_return(ifindex > 0, -EINVAL); | |
128 | assert_return(filename, -EINVAL); | |
129 | ||
130 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) | |
131 | return -ENOMEM; | |
132 | ||
133 | r = parse_env_file(p, NEWLINE, "NETWORK_FILE", &s, NULL); | |
134 | if (r == -ENOENT) | |
135 | return -ENODATA; | |
136 | if (r < 0) | |
137 | return r; | |
138 | if (isempty(s)) | |
139 | return -ENODATA; | |
140 | ||
141 | *filename = s; | |
142 | s = NULL; | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | _public_ int sd_network_link_get_operational_state(int ifindex, char **state) { | |
148 | _cleanup_free_ char *s = NULL, *p = NULL; | |
149 | int r; | |
150 | ||
151 | assert_return(ifindex > 0, -EINVAL); | |
152 | assert_return(state, -EINVAL); | |
153 | ||
154 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) | |
155 | return -ENOMEM; | |
156 | ||
157 | r = parse_env_file(p, NEWLINE, "OPER_STATE", &s, NULL); | |
158 | if (r == -ENOENT) | |
159 | return -ENODATA; | |
160 | if (r < 0) | |
161 | return r; | |
162 | if (isempty(s)) | |
163 | return -ENODATA; | |
164 | ||
165 | *state = s; | |
166 | s = NULL; | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
171 | _public_ int sd_network_link_get_llmnr(int ifindex, char **llmnr) { | |
172 | _cleanup_free_ char *s = NULL, *p = NULL; | |
173 | int r; | |
174 | ||
175 | assert_return(ifindex > 0, -EINVAL); | |
176 | assert_return(llmnr, -EINVAL); | |
177 | ||
178 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) | |
179 | return -ENOMEM; | |
180 | ||
181 | r = parse_env_file(p, NEWLINE, "LLMNR", &s, NULL); | |
182 | if (r == -ENOENT) | |
183 | return -ENODATA; | |
184 | if (r < 0) | |
185 | return r; | |
186 | if (isempty(s)) | |
187 | return -ENODATA; | |
188 | ||
189 | *llmnr = s; | |
190 | s = NULL; | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
e735f4d4 MP |
195 | _public_ int sd_network_link_get_lldp(int ifindex, char **lldp) { |
196 | _cleanup_free_ char *s = NULL, *p = NULL; | |
197 | size_t size; | |
198 | int r; | |
199 | ||
200 | assert_return(ifindex > 0, -EINVAL); | |
201 | assert_return(lldp, -EINVAL); | |
202 | ||
203 | if (asprintf(&p, "/run/systemd/netif/lldp/%d", ifindex) < 0) | |
204 | return -ENOMEM; | |
205 | ||
206 | r = read_full_file(p, &s, &size); | |
207 | if (r == -ENOENT) | |
208 | return -ENODATA; | |
209 | if (r < 0) | |
210 | return r; | |
211 | if (size <= 0) | |
212 | return -ENODATA; | |
213 | ||
214 | *lldp = s; | |
215 | s = NULL; | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | ||
5eef597e MP |
221 | static int network_get_link_strv(const char *key, int ifindex, char ***ret) { |
222 | _cleanup_free_ char *p = NULL, *s = NULL; | |
223 | _cleanup_strv_free_ char **a = NULL; | |
224 | int r; | |
225 | ||
226 | assert_return(ifindex > 0, -EINVAL); | |
227 | assert_return(ret, -EINVAL); | |
228 | ||
229 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) | |
230 | return -ENOMEM; | |
231 | ||
232 | r = parse_env_file(p, NEWLINE, key, &s, NULL); | |
233 | if (r == -ENOENT) | |
234 | return -ENODATA; | |
235 | if (r < 0) | |
236 | return r; | |
237 | if (isempty(s)) { | |
238 | *ret = NULL; | |
239 | return 0; | |
240 | } | |
241 | ||
242 | a = strv_split(s, " "); | |
243 | if (!a) | |
244 | return -ENOMEM; | |
245 | ||
246 | strv_uniq(a); | |
247 | r = strv_length(a); | |
248 | ||
249 | *ret = a; | |
250 | a = NULL; | |
251 | ||
252 | return r; | |
253 | } | |
254 | ||
255 | _public_ int sd_network_link_get_dns(int ifindex, char ***ret) { | |
256 | return network_get_link_strv("DNS", ifindex, ret); | |
257 | } | |
258 | ||
259 | _public_ int sd_network_link_get_ntp(int ifindex, char ***ret) { | |
260 | return network_get_link_strv("NTP", ifindex, ret); | |
261 | } | |
262 | ||
263 | _public_ int sd_network_link_get_domains(int ifindex, char ***ret) { | |
264 | return network_get_link_strv("DOMAINS", ifindex, ret); | |
265 | } | |
266 | ||
267 | _public_ int sd_network_link_get_wildcard_domain(int ifindex) { | |
268 | int r; | |
269 | _cleanup_free_ char *p = NULL, *s = NULL; | |
270 | ||
271 | assert_return(ifindex > 0, -EINVAL); | |
272 | ||
273 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) | |
274 | return -ENOMEM; | |
275 | ||
276 | r = parse_env_file(p, NEWLINE, "WILDCARD_DOMAIN", &s, NULL); | |
277 | if (r == -ENOENT) | |
278 | return -ENODATA; | |
279 | if (r < 0) | |
280 | return r; | |
281 | if (isempty(s)) | |
282 | return -ENODATA; | |
283 | ||
284 | return parse_boolean(s); | |
285 | } | |
286 | ||
287 | static inline int MONITOR_TO_FD(sd_network_monitor *m) { | |
288 | return (int) (unsigned long) m - 1; | |
289 | } | |
290 | ||
291 | static inline sd_network_monitor* FD_TO_MONITOR(int fd) { | |
292 | return (sd_network_monitor*) (unsigned long) (fd + 1); | |
293 | } | |
294 | ||
295 | _public_ int sd_network_monitor_new(sd_network_monitor **m, const char *category) { | |
296 | int fd, k; | |
297 | bool good = false; | |
298 | ||
299 | assert_return(m, -EINVAL); | |
300 | ||
301 | fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
302 | if (fd < 0) | |
303 | return -errno; | |
304 | ||
305 | if (!category || streq(category, "links")) { | |
306 | k = inotify_add_watch(fd, "/run/systemd/netif/links/", IN_MOVED_TO|IN_DELETE); | |
307 | if (k < 0) { | |
308 | safe_close(fd); | |
309 | return -errno; | |
310 | } | |
311 | ||
312 | good = true; | |
313 | } | |
314 | ||
315 | if (!good) { | |
316 | close_nointr(fd); | |
317 | return -EINVAL; | |
318 | } | |
319 | ||
320 | *m = FD_TO_MONITOR(fd); | |
321 | return 0; | |
322 | } | |
323 | ||
324 | _public_ sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) { | |
325 | int fd; | |
326 | ||
327 | assert_return(m, NULL); | |
328 | ||
329 | fd = MONITOR_TO_FD(m); | |
330 | close_nointr(fd); | |
331 | ||
332 | return NULL; | |
333 | } | |
334 | ||
335 | _public_ int sd_network_monitor_flush(sd_network_monitor *m) { | |
336 | ||
337 | assert_return(m, -EINVAL); | |
338 | ||
339 | return flush_fd(MONITOR_TO_FD(m)); | |
340 | } | |
341 | ||
342 | _public_ int sd_network_monitor_get_fd(sd_network_monitor *m) { | |
343 | ||
344 | assert_return(m, -EINVAL); | |
345 | ||
346 | return MONITOR_TO_FD(m); | |
347 | } | |
348 | ||
349 | _public_ int sd_network_monitor_get_events(sd_network_monitor *m) { | |
350 | ||
351 | assert_return(m, -EINVAL); | |
352 | ||
353 | /* For now we will only return POLLIN here, since we don't | |
354 | * need anything else ever for inotify. However, let's have | |
355 | * this API to keep our options open should we later on need | |
356 | * it. */ | |
357 | return POLLIN; | |
358 | } | |
359 | ||
360 | _public_ int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *timeout_usec) { | |
361 | ||
362 | assert_return(m, -EINVAL); | |
363 | assert_return(timeout_usec, -EINVAL); | |
364 | ||
365 | /* For now we will only return (uint64_t) -1, since we don't | |
366 | * need any timeout. However, let's have this API to keep our | |
367 | * options open should we later on need it. */ | |
368 | *timeout_usec = (uint64_t) -1; | |
369 | return 0; | |
370 | } |