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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" | |
35 | #include "dhcp-lease-internal.h" | |
36 | ||
deb2e523 TG |
37 | static int link_get_flags(unsigned index, unsigned *flags) { |
38 | _cleanup_free_ char *s = NULL, *p = NULL; | |
39 | int r; | |
40 | ||
41 | assert(index); | |
42 | assert(flags); | |
43 | ||
44 | if (asprintf(&p, "/run/systemd/network/links/%u", index) < 0) | |
45 | return -ENOMEM; | |
46 | ||
47 | r = parse_env_file(p, NEWLINE, "FLAGS", &s, NULL); | |
48 | if (r == -ENOENT) | |
49 | return -ENODATA; | |
50 | else if (r < 0) | |
51 | return r; | |
52 | else if (!s) | |
53 | return -EIO; | |
54 | ||
55 | return safe_atou(s, flags); | |
56 | } | |
57 | ||
58 | _public_ int sd_network_link_is_loopback(unsigned index) { | |
59 | unsigned flags; | |
60 | int r; | |
61 | ||
62 | r = link_get_flags(index, &flags); | |
63 | if (r < 0) | |
64 | return 0; | |
65 | ||
66 | return flags & IFF_LOOPBACK; | |
67 | } | |
68 | ||
fe8db0c5 | 69 | _public_ int sd_network_get_link_state(unsigned index, char **state) { |
cb6fa44c | 70 | _cleanup_free_ char *s = NULL, *p = NULL; |
fe8db0c5 TG |
71 | int r; |
72 | ||
73 | assert_return(index, -EINVAL); | |
74 | assert_return(state, -EINVAL); | |
75 | ||
76 | if (asprintf(&p, "/run/systemd/network/links/%u", index) < 0) | |
77 | return -ENOMEM; | |
78 | ||
deb2e523 | 79 | r = parse_env_file(p, NEWLINE, "ADMIN_STATE", &s, NULL); |
cb6fa44c TG |
80 | if (r == -ENOENT) |
81 | return -ENODATA; | |
82 | else if (r < 0) | |
fe8db0c5 | 83 | return r; |
cb6fa44c | 84 | else if (!s) |
fe8db0c5 TG |
85 | return -EIO; |
86 | ||
cb6fa44c TG |
87 | if (streq(s, "unmanaged")) |
88 | return -EUNATCH; | |
deb2e523 TG |
89 | else if (streq(s, "initializing")) |
90 | return -EBUSY; | |
91 | ||
92 | *state = s; | |
93 | s = NULL; | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
bbf7c048 TG |
98 | _public_ int sd_network_get_operational_state(char **state) { |
99 | _cleanup_free_ char *s = NULL; | |
100 | int r; | |
101 | ||
102 | assert_return(state, -EINVAL); | |
103 | ||
104 | r = parse_env_file("/run/systemd/network/state", NEWLINE, "OPER_STATE", | |
105 | &s, NULL); | |
106 | if (r == -ENOENT) | |
107 | return -ENODATA; | |
108 | else if (r < 0) | |
109 | return r; | |
110 | else if (!s) | |
111 | return -EIO; | |
112 | ||
113 | *state = s; | |
114 | s = NULL; | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
deb2e523 TG |
119 | _public_ int sd_network_get_link_operational_state(unsigned index, char **state) { |
120 | _cleanup_free_ char *s = NULL, *p = NULL; | |
121 | int r; | |
122 | ||
123 | assert_return(index, -EINVAL); | |
124 | assert_return(state, -EINVAL); | |
125 | ||
126 | if (asprintf(&p, "/run/systemd/network/links/%u", index) < 0) | |
127 | return -ENOMEM; | |
128 | ||
129 | r = parse_env_file(p, NEWLINE, "OPER_STATE", &s, NULL); | |
130 | if (r == -ENOENT) | |
131 | return -ENODATA; | |
132 | else if (r < 0) | |
133 | return r; | |
134 | else if (!s) | |
135 | return -EIO; | |
cb6fa44c | 136 | |
fe8db0c5 | 137 | *state = s; |
cb6fa44c TG |
138 | s = NULL; |
139 | ||
fe8db0c5 TG |
140 | return 0; |
141 | } | |
142 | ||
143 | _public_ int sd_network_get_dhcp_lease(unsigned index, sd_dhcp_lease **ret) { | |
144 | sd_dhcp_lease *lease; | |
145 | char *p, *s = NULL; | |
146 | int r; | |
147 | ||
148 | assert_return(index, -EINVAL); | |
149 | assert_return(ret, -EINVAL); | |
150 | ||
151 | if (asprintf(&p, "/run/systemd/network/links/%u", index) < 0) | |
152 | return -ENOMEM; | |
153 | ||
154 | r = parse_env_file(p, NEWLINE, "DHCP_LEASE", &s, NULL); | |
155 | free(p); | |
156 | ||
157 | if (r < 0) { | |
158 | free(s); | |
159 | return r; | |
160 | } else if (!s) | |
161 | return -EIO; | |
162 | ||
163 | r = dhcp_lease_load(s, &lease); | |
164 | if (r < 0) | |
165 | return r; | |
166 | ||
167 | *ret = lease; | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | _public_ int sd_network_get_ifindices(unsigned **indices) { | |
173 | _cleanup_closedir_ DIR *d; | |
174 | int r = 0; | |
175 | unsigned n = 0; | |
176 | _cleanup_free_ uid_t *l = NULL; | |
177 | ||
178 | d = opendir("/run/systemd/network/links/"); | |
179 | if (!d) | |
180 | return -errno; | |
181 | ||
182 | for (;;) { | |
183 | struct dirent *de; | |
184 | int k; | |
185 | unsigned index; | |
186 | ||
187 | errno = 0; | |
188 | de = readdir(d); | |
189 | if (!de && errno != 0) | |
190 | return -errno; | |
191 | ||
192 | if (!de) | |
193 | break; | |
194 | ||
195 | dirent_ensure_type(d, de); | |
196 | ||
197 | if (!dirent_is_file(de)) | |
198 | continue; | |
199 | ||
200 | k = safe_atou(de->d_name, &index); | |
201 | if (k < 0) | |
202 | continue; | |
203 | ||
204 | if (indices) { | |
205 | if ((unsigned) r >= n) { | |
206 | unsigned *t; | |
207 | ||
208 | n = MAX(16, 2*r); | |
209 | t = realloc(l, sizeof(unsigned) * n); | |
210 | if (!t) | |
211 | return -ENOMEM; | |
212 | ||
213 | l = t; | |
214 | } | |
215 | ||
216 | assert((unsigned) r < n); | |
217 | l[r++] = index; | |
218 | } else | |
219 | r++; | |
220 | } | |
221 | ||
222 | if (indices) { | |
223 | *indices = l; | |
224 | l = NULL; | |
225 | } | |
226 | ||
227 | return r; | |
228 | } | |
229 | ||
230 | static inline int MONITOR_TO_FD(sd_network_monitor *m) { | |
231 | return (int) (unsigned long) m - 1; | |
232 | } | |
233 | ||
234 | static inline sd_network_monitor* FD_TO_MONITOR(int fd) { | |
235 | return (sd_network_monitor*) (unsigned long) (fd + 1); | |
236 | } | |
237 | ||
238 | _public_ int sd_network_monitor_new(const char *category, sd_network_monitor **m) { | |
239 | int fd, k; | |
240 | bool good = false; | |
241 | ||
242 | assert_return(m, -EINVAL); | |
243 | ||
244 | fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
245 | if (fd < 0) | |
246 | return -errno; | |
247 | ||
7e141e49 | 248 | if (!category || streq(category, "links")) { |
fe8db0c5 TG |
249 | k = inotify_add_watch(fd, "/run/systemd/network/links/", IN_MOVED_TO|IN_DELETE); |
250 | if (k < 0) { | |
03e334a1 | 251 | safe_close(fd); |
fe8db0c5 TG |
252 | return -errno; |
253 | } | |
254 | ||
255 | good = true; | |
256 | } | |
257 | ||
7e141e49 TG |
258 | if (!category || streq(category, "leases")) { |
259 | k = inotify_add_watch(fd, "/run/systemd/network/leases/", IN_MOVED_TO|IN_DELETE); | |
260 | if (k < 0) { | |
261 | safe_close(fd); | |
262 | return -errno; | |
263 | } | |
264 | ||
265 | good = true; | |
266 | } | |
267 | ||
fe8db0c5 TG |
268 | if (!good) { |
269 | close_nointr(fd); | |
270 | return -EINVAL; | |
271 | } | |
272 | ||
273 | *m = FD_TO_MONITOR(fd); | |
274 | return 0; | |
275 | } | |
276 | ||
277 | _public_ sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) { | |
278 | int fd; | |
279 | ||
280 | assert_return(m, NULL); | |
281 | ||
282 | fd = MONITOR_TO_FD(m); | |
283 | close_nointr(fd); | |
284 | ||
285 | return NULL; | |
286 | } | |
287 | ||
288 | _public_ int sd_network_monitor_flush(sd_network_monitor *m) { | |
289 | ||
290 | assert_return(m, -EINVAL); | |
291 | ||
292 | return flush_fd(MONITOR_TO_FD(m)); | |
293 | } | |
294 | ||
295 | _public_ int sd_network_monitor_get_fd(sd_network_monitor *m) { | |
296 | ||
297 | assert_return(m, -EINVAL); | |
298 | ||
299 | return MONITOR_TO_FD(m); | |
300 | } | |
301 | ||
302 | _public_ int sd_network_monitor_get_events(sd_network_monitor *m) { | |
303 | ||
304 | assert_return(m, -EINVAL); | |
305 | ||
306 | /* For now we will only return POLLIN here, since we don't | |
307 | * need anything else ever for inotify. However, let's have | |
308 | * this API to keep our options open should we later on need | |
309 | * it. */ | |
310 | return POLLIN; | |
311 | } | |
312 | ||
313 | _public_ int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *timeout_usec) { | |
314 | ||
315 | assert_return(m, -EINVAL); | |
316 | assert_return(timeout_usec, -EINVAL); | |
317 | ||
318 | /* For now we will only return (uint64_t) -1, since we don't | |
319 | * need any timeout. However, let's have this API to keep our | |
320 | * options open should we later on need it. */ | |
321 | *timeout_usec = (uint64_t) -1; | |
322 | return 0; | |
323 | } |