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fe8db0c5 TG |
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> | |
27 | #include <sys/poll.h> | |
deb2e523 | 28 | #include <net/if.h> |
fe8db0c5 TG |
29 | |
30 | #include "util.h" | |
31 | #include "macro.h" | |
32 | #include "strv.h" | |
33 | #include "fileio.h" | |
34 | #include "sd-network.h" | |
7dbf94a9 | 35 | #include "network-internal.h" |
fe8db0c5 | 36 | |
03cc0fd1 LP |
37 | _public_ int sd_network_get_operational_state(char **state) { |
38 | _cleanup_free_ char *s = NULL; | |
deb2e523 TG |
39 | int r; |
40 | ||
fe8db0c5 TG |
41 | assert_return(state, -EINVAL); |
42 | ||
03cc0fd1 | 43 | r = parse_env_file("/run/systemd/netif/state", NEWLINE, "OPER_STATE", &s, NULL); |
cb6fa44c TG |
44 | if (r == -ENOENT) |
45 | return -ENODATA; | |
03cc0fd1 | 46 | if (r < 0) |
fe8db0c5 | 47 | return r; |
03cc0fd1 LP |
48 | if (isempty(s)) |
49 | return -ENODATA; | |
deb2e523 TG |
50 | |
51 | *state = s; | |
52 | s = NULL; | |
53 | ||
54 | return 0; | |
55 | } | |
56 | ||
03cc0fd1 LP |
57 | static int network_get_strv(const char *key, char ***ret) { |
58 | _cleanup_strv_free_ char **a = NULL; | |
bbf7c048 TG |
59 | _cleanup_free_ char *s = NULL; |
60 | int r; | |
61 | ||
03cc0fd1 LP |
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_link_state(int ifindex, char **state) { | |
96 | _cleanup_free_ char *s = NULL, *p = NULL; | |
97 | int r; | |
98 | ||
99 | assert_return(ifindex > 0, -EINVAL); | |
bbf7c048 TG |
100 | assert_return(state, -EINVAL); |
101 | ||
03cc0fd1 LP |
102 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) |
103 | return -ENOMEM; | |
104 | ||
105 | r = parse_env_file(p, NEWLINE, "ADMIN_STATE", &s, NULL); | |
bbf7c048 TG |
106 | if (r == -ENOENT) |
107 | return -ENODATA; | |
03cc0fd1 | 108 | if (r < 0) |
bbf7c048 | 109 | return r; |
03cc0fd1 LP |
110 | if (isempty(s)) |
111 | return -ENODATA; | |
112 | if (streq(s, "initializing")) | |
113 | return -EBUSY; | |
bbf7c048 TG |
114 | |
115 | *state = s; | |
116 | s = NULL; | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
6dcaa6f5 | 121 | _public_ int sd_network_get_link_operational_state(int ifindex, char **state) { |
deb2e523 TG |
122 | _cleanup_free_ char *s = NULL, *p = NULL; |
123 | int r; | |
124 | ||
6dcaa6f5 | 125 | assert_return(ifindex > 0, -EINVAL); |
deb2e523 TG |
126 | assert_return(state, -EINVAL); |
127 | ||
6dcaa6f5 | 128 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) |
deb2e523 TG |
129 | return -ENOMEM; |
130 | ||
131 | r = parse_env_file(p, NEWLINE, "OPER_STATE", &s, NULL); | |
132 | if (r == -ENOENT) | |
133 | return -ENODATA; | |
03cc0fd1 | 134 | if (r < 0) |
deb2e523 | 135 | return r; |
03cc0fd1 LP |
136 | if (isempty(s)) |
137 | return -ENODATA; | |
cb6fa44c | 138 | |
fe8db0c5 | 139 | *state = s; |
cb6fa44c TG |
140 | s = NULL; |
141 | ||
fe8db0c5 TG |
142 | return 0; |
143 | } | |
144 | ||
6436165d | 145 | _public_ int sd_network_get_link_llmnr(int ifindex, char **llmnr) { |
bd8f6538 TG |
146 | _cleanup_free_ char *s = NULL, *p = NULL; |
147 | int r; | |
148 | ||
149 | assert_return(ifindex > 0, -EINVAL); | |
150 | assert_return(llmnr, -EINVAL); | |
151 | ||
2cd666f8 LP |
152 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) |
153 | return -ENOMEM; | |
154 | ||
bd8f6538 TG |
155 | r = parse_env_file(p, NEWLINE, "LLMNR", &s, NULL); |
156 | if (r == -ENOENT) | |
157 | return -ENODATA; | |
03cc0fd1 | 158 | if (r < 0) |
bd8f6538 | 159 | return r; |
03cc0fd1 | 160 | if (isempty(s)) |
b3df0b34 | 161 | return -ENODATA; |
bd8f6538 TG |
162 | |
163 | *llmnr = s; | |
164 | s = NULL; | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
6436165d | 169 | static int network_get_link_strv(const char *key, int ifindex, char ***ret) { |
7dbf94a9 | 170 | _cleanup_free_ char *p = NULL, *s = NULL; |
6f4dedb2 | 171 | _cleanup_strv_free_ char **a = NULL; |
7dbf94a9 TG |
172 | int r; |
173 | ||
6dcaa6f5 | 174 | assert_return(ifindex > 0, -EINVAL); |
6f4dedb2 | 175 | assert_return(ret, -EINVAL); |
7dbf94a9 | 176 | |
6dcaa6f5 | 177 | if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0) |
7dbf94a9 TG |
178 | return -ENOMEM; |
179 | ||
bcb7a07e | 180 | r = parse_env_file(p, NEWLINE, key, &s, NULL); |
03cc0fd1 LP |
181 | if (r == -ENOENT) |
182 | return -ENODATA; | |
7dbf94a9 TG |
183 | if (r < 0) |
184 | return r; | |
03cc0fd1 | 185 | if (isempty(s)) { |
6f4dedb2 | 186 | *ret = NULL; |
6f4dedb2 TG |
187 | return 0; |
188 | } | |
7dbf94a9 | 189 | |
6f4dedb2 TG |
190 | a = strv_split(s, " "); |
191 | if (!a) | |
7dbf94a9 TG |
192 | return -ENOMEM; |
193 | ||
6f4dedb2 TG |
194 | strv_uniq(a); |
195 | r = strv_length(a); | |
7dbf94a9 | 196 | |
6f4dedb2 TG |
197 | *ret = a; |
198 | a = NULL; | |
7dbf94a9 | 199 | |
6f4dedb2 | 200 | return r; |
7dbf94a9 TG |
201 | } |
202 | ||
6436165d LP |
203 | _public_ int sd_network_get_link_dns(int ifindex, char ***ret) { |
204 | return network_get_link_strv("DNS", ifindex, ret); | |
bcb7a07e TG |
205 | } |
206 | ||
6436165d LP |
207 | _public_ int sd_network_get_link_ntp(int ifindex, char ***ret) { |
208 | return network_get_link_strv("NTP", ifindex, ret); | |
bcb7a07e TG |
209 | } |
210 | ||
fe8db0c5 TG |
211 | static inline int MONITOR_TO_FD(sd_network_monitor *m) { |
212 | return (int) (unsigned long) m - 1; | |
213 | } | |
214 | ||
215 | static inline sd_network_monitor* FD_TO_MONITOR(int fd) { | |
216 | return (sd_network_monitor*) (unsigned long) (fd + 1); | |
217 | } | |
218 | ||
0014a4ad | 219 | _public_ int sd_network_monitor_new(sd_network_monitor **m, const char *category) { |
fe8db0c5 TG |
220 | int fd, k; |
221 | bool good = false; | |
222 | ||
223 | assert_return(m, -EINVAL); | |
224 | ||
225 | fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
226 | if (fd < 0) | |
227 | return -errno; | |
228 | ||
7e141e49 | 229 | if (!category || streq(category, "links")) { |
85b5673b | 230 | k = inotify_add_watch(fd, "/run/systemd/netif/links/", IN_MOVED_TO|IN_DELETE); |
fe8db0c5 | 231 | if (k < 0) { |
03e334a1 | 232 | safe_close(fd); |
fe8db0c5 TG |
233 | return -errno; |
234 | } | |
235 | ||
236 | good = true; | |
237 | } | |
238 | ||
239 | if (!good) { | |
240 | close_nointr(fd); | |
241 | return -EINVAL; | |
242 | } | |
243 | ||
244 | *m = FD_TO_MONITOR(fd); | |
245 | return 0; | |
246 | } | |
247 | ||
248 | _public_ sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) { | |
249 | int fd; | |
250 | ||
251 | assert_return(m, NULL); | |
252 | ||
253 | fd = MONITOR_TO_FD(m); | |
254 | close_nointr(fd); | |
255 | ||
256 | return NULL; | |
257 | } | |
258 | ||
259 | _public_ int sd_network_monitor_flush(sd_network_monitor *m) { | |
260 | ||
261 | assert_return(m, -EINVAL); | |
262 | ||
263 | return flush_fd(MONITOR_TO_FD(m)); | |
264 | } | |
265 | ||
266 | _public_ int sd_network_monitor_get_fd(sd_network_monitor *m) { | |
267 | ||
268 | assert_return(m, -EINVAL); | |
269 | ||
270 | return MONITOR_TO_FD(m); | |
271 | } | |
272 | ||
273 | _public_ int sd_network_monitor_get_events(sd_network_monitor *m) { | |
274 | ||
275 | assert_return(m, -EINVAL); | |
276 | ||
277 | /* For now we will only return POLLIN here, since we don't | |
278 | * need anything else ever for inotify. However, let's have | |
279 | * this API to keep our options open should we later on need | |
280 | * it. */ | |
281 | return POLLIN; | |
282 | } | |
283 | ||
284 | _public_ int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *timeout_usec) { | |
285 | ||
286 | assert_return(m, -EINVAL); | |
287 | assert_return(timeout_usec, -EINVAL); | |
288 | ||
289 | /* For now we will only return (uint64_t) -1, since we don't | |
290 | * need any timeout. However, let's have this API to keep our | |
291 | * options open should we later on need it. */ | |
292 | *timeout_usec = (uint64_t) -1; | |
293 | return 0; | |
294 | } |