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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
e537352b LP |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
e537352b LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
e537352b | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
e537352b LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <utmpx.h> | |
23 | #include <errno.h> | |
24 | #include <assert.h> | |
25 | #include <string.h> | |
26 | #include <sys/utsname.h> | |
ef2f1067 LP |
27 | #include <fcntl.h> |
28 | #include <unistd.h> | |
29 | #include <sys/poll.h> | |
e537352b LP |
30 | |
31 | #include "macro.h" | |
9eb977db | 32 | #include "path-util.h" |
e537352b LP |
33 | #include "utmp-wtmp.h" |
34 | ||
35 | int utmp_get_runlevel(int *runlevel, int *previous) { | |
36 | struct utmpx lookup, *found; | |
37 | int r; | |
38 | const char *e; | |
39 | ||
40 | assert(runlevel); | |
41 | ||
42 | /* If these values are set in the environment this takes | |
43 | * precedence. Presumably, sysvinit does this to work around a | |
44 | * race condition that would otherwise exist where we'd always | |
45 | * go to disk and hence might read runlevel data that might be | |
46 | * very new and does not apply to the current script being | |
47 | * executed. */ | |
48 | ||
49 | if ((e = getenv("RUNLEVEL")) && e[0] > 0) { | |
50 | *runlevel = e[0]; | |
51 | ||
52 | if (previous) { | |
53 | /* $PREVLEVEL seems to be an Upstart thing */ | |
54 | ||
55 | if ((e = getenv("PREVLEVEL")) && e[0] > 0) | |
56 | *previous = e[0]; | |
57 | else | |
58 | *previous = 0; | |
59 | } | |
60 | ||
61 | return 0; | |
62 | } | |
63 | ||
64 | if (utmpxname(_PATH_UTMPX) < 0) | |
65 | return -errno; | |
66 | ||
67 | setutxent(); | |
68 | ||
69 | zero(lookup); | |
70 | lookup.ut_type = RUN_LVL; | |
71 | ||
72 | if (!(found = getutxid(&lookup))) | |
73 | r = -errno; | |
74 | else { | |
75 | int a, b; | |
76 | ||
77 | a = found->ut_pid & 0xFF; | |
78 | b = (found->ut_pid >> 8) & 0xFF; | |
79 | ||
80 | if (a < 0 || b < 0) | |
81 | r = -EIO; | |
82 | else { | |
83 | *runlevel = a; | |
84 | ||
85 | if (previous) | |
86 | *previous = b; | |
87 | r = 0; | |
88 | } | |
89 | } | |
90 | ||
91 | endutxent(); | |
92 | ||
93 | return r; | |
94 | } | |
95 | ||
169c1bda | 96 | static void init_timestamp(struct utmpx *store, usec_t t) { |
e537352b LP |
97 | assert(store); |
98 | ||
99 | zero(*store); | |
e537352b | 100 | |
871d7de4 LP |
101 | if (t <= 0) |
102 | t = now(CLOCK_REALTIME); | |
e537352b | 103 | |
871d7de4 LP |
104 | store->ut_tv.tv_sec = t / USEC_PER_SEC; |
105 | store->ut_tv.tv_usec = t % USEC_PER_SEC; | |
169c1bda LP |
106 | } |
107 | ||
108 | static void init_entry(struct utmpx *store, usec_t t) { | |
109 | struct utsname uts; | |
110 | ||
111 | assert(store); | |
112 | ||
113 | init_timestamp(store, t); | |
114 | ||
115 | zero(uts); | |
e537352b LP |
116 | |
117 | if (uname(&uts) >= 0) | |
118 | strncpy(store->ut_host, uts.release, sizeof(store->ut_host)); | |
119 | ||
120 | strncpy(store->ut_line, "~", sizeof(store->ut_line)); /* or ~~ ? */ | |
121 | strncpy(store->ut_id, "~~", sizeof(store->ut_id)); | |
122 | } | |
123 | ||
124 | static int write_entry_utmp(const struct utmpx *store) { | |
125 | int r; | |
126 | ||
127 | assert(store); | |
128 | ||
129 | /* utmp is similar to wtmp, but there is only one entry for | |
130 | * each entry type resp. user; i.e. basically a key/value | |
131 | * table. */ | |
132 | ||
133 | if (utmpxname(_PATH_UTMPX) < 0) | |
134 | return -errno; | |
135 | ||
136 | setutxent(); | |
137 | ||
138 | if (!pututxline(store)) | |
139 | r = -errno; | |
140 | else | |
141 | r = 0; | |
142 | ||
143 | endutxent(); | |
144 | ||
145 | return r; | |
146 | } | |
147 | ||
148 | static int write_entry_wtmp(const struct utmpx *store) { | |
149 | assert(store); | |
150 | ||
151 | /* wtmp is a simple append-only file where each entry is | |
152 | simply appended to * the end; i.e. basically a log. */ | |
153 | ||
154 | errno = 0; | |
155 | updwtmpx(_PATH_WTMPX, store); | |
156 | return -errno; | |
157 | } | |
158 | ||
4743137a | 159 | static int write_utmp_wtmp(const struct utmpx *store_utmp, const struct utmpx *store_wtmp) { |
e537352b LP |
160 | int r, s; |
161 | ||
4743137a MS |
162 | r = write_entry_utmp(store_utmp); |
163 | s = write_entry_wtmp(store_wtmp); | |
e537352b LP |
164 | |
165 | if (r >= 0) | |
166 | r = s; | |
167 | ||
168 | /* If utmp/wtmp have been disabled, that's a good thing, hence | |
169 | * ignore the errors */ | |
170 | if (r == -ENOENT) | |
171 | r = 0; | |
172 | ||
173 | return r; | |
174 | } | |
175 | ||
4743137a MS |
176 | static int write_entry_both(const struct utmpx *store) { |
177 | return write_utmp_wtmp(store, store); | |
178 | } | |
179 | ||
0ad26e09 | 180 | int utmp_put_shutdown(void) { |
e537352b LP |
181 | struct utmpx store; |
182 | ||
0ad26e09 | 183 | init_entry(&store, 0); |
e537352b LP |
184 | |
185 | store.ut_type = RUN_LVL; | |
186 | strncpy(store.ut_user, "shutdown", sizeof(store.ut_user)); | |
187 | ||
188 | return write_entry_both(&store); | |
189 | } | |
190 | ||
871d7de4 | 191 | int utmp_put_reboot(usec_t t) { |
e537352b LP |
192 | struct utmpx store; |
193 | ||
871d7de4 | 194 | init_entry(&store, t); |
e537352b LP |
195 | |
196 | store.ut_type = BOOT_TIME; | |
55e39f40 | 197 | strncpy(store.ut_user, "reboot", sizeof(store.ut_user)); |
e537352b LP |
198 | |
199 | return write_entry_both(&store); | |
200 | } | |
201 | ||
169c1bda LP |
202 | static const char *sanitize_id(const char *id) { |
203 | size_t l; | |
204 | ||
205 | assert(id); | |
206 | l = strlen(id); | |
207 | ||
208 | if (l <= sizeof(((struct utmpx*) NULL)->ut_id)) | |
209 | return id; | |
210 | ||
211 | return id + l - sizeof(((struct utmpx*) NULL)->ut_id); | |
212 | } | |
213 | ||
0ad26e09 | 214 | int utmp_put_init_process(const char *id, pid_t pid, pid_t sid, const char *line) { |
169c1bda LP |
215 | struct utmpx store; |
216 | ||
217 | assert(id); | |
218 | ||
0ad26e09 | 219 | init_timestamp(&store, 0); |
169c1bda LP |
220 | |
221 | store.ut_type = INIT_PROCESS; | |
222 | store.ut_pid = pid; | |
223 | store.ut_session = sid; | |
224 | ||
225 | strncpy(store.ut_id, sanitize_id(id), sizeof(store.ut_id)); | |
226 | ||
227 | if (line) | |
9eb977db | 228 | strncpy(store.ut_line, path_get_file_name(line), sizeof(store.ut_line)); |
169c1bda LP |
229 | |
230 | return write_entry_both(&store); | |
231 | } | |
232 | ||
233 | int utmp_put_dead_process(const char *id, pid_t pid, int code, int status) { | |
4743137a | 234 | struct utmpx lookup, store, store_wtmp, *found; |
169c1bda LP |
235 | |
236 | assert(id); | |
237 | ||
238 | setutxent(); | |
239 | ||
240 | zero(lookup); | |
241 | lookup.ut_type = INIT_PROCESS; /* looks for DEAD_PROCESS, LOGIN_PROCESS, USER_PROCESS, too */ | |
242 | strncpy(lookup.ut_id, sanitize_id(id), sizeof(lookup.ut_id)); | |
243 | ||
244 | if (!(found = getutxid(&lookup))) | |
245 | return 0; | |
246 | ||
247 | if (found->ut_pid != pid) | |
248 | return 0; | |
249 | ||
fa4ad7ce | 250 | memcpy(&store, found, sizeof(store)); |
169c1bda LP |
251 | store.ut_type = DEAD_PROCESS; |
252 | store.ut_exit.e_termination = code; | |
253 | store.ut_exit.e_exit = status; | |
254 | ||
255 | zero(store.ut_user); | |
256 | zero(store.ut_host); | |
257 | zero(store.ut_tv); | |
258 | ||
4743137a MS |
259 | memcpy(&store_wtmp, &store, sizeof(store_wtmp)); |
260 | /* wtmp wants the current time */ | |
261 | init_timestamp(&store_wtmp, 0); | |
262 | ||
263 | return write_utmp_wtmp(&store, &store_wtmp); | |
169c1bda LP |
264 | } |
265 | ||
266 | ||
0ad26e09 | 267 | int utmp_put_runlevel(int runlevel, int previous) { |
e537352b LP |
268 | struct utmpx store; |
269 | int r; | |
270 | ||
271 | assert(runlevel > 0); | |
272 | ||
273 | if (previous <= 0) { | |
274 | /* Find the old runlevel automatically */ | |
275 | ||
d7fc909d LP |
276 | if ((r = utmp_get_runlevel(&previous, NULL)) < 0) { |
277 | if (r != -ESRCH) | |
278 | return r; | |
279 | ||
280 | previous = 0; | |
281 | } | |
e537352b LP |
282 | } |
283 | ||
4927fcae LP |
284 | if (previous == runlevel) |
285 | return 0; | |
286 | ||
0ad26e09 | 287 | init_entry(&store, 0); |
e537352b LP |
288 | |
289 | store.ut_type = RUN_LVL; | |
290 | store.ut_pid = (runlevel & 0xFF) | ((previous & 0xFF) << 8); | |
291 | strncpy(store.ut_user, "runlevel", sizeof(store.ut_user)); | |
292 | ||
293 | return write_entry_both(&store); | |
294 | } | |
ef2f1067 LP |
295 | |
296 | #define TIMEOUT_MSEC 50 | |
297 | ||
298 | static int write_to_terminal(const char *tty, const char *message) { | |
299 | int fd, r; | |
300 | const char *p; | |
301 | size_t left; | |
302 | usec_t end; | |
303 | ||
304 | assert(tty); | |
305 | assert(message); | |
306 | ||
307 | if ((fd = open(tty, O_WRONLY|O_NDELAY|O_NOCTTY|O_CLOEXEC)) < 0) | |
308 | return -errno; | |
309 | ||
310 | if (!isatty(fd)) { | |
311 | r = -errno; | |
312 | goto finish; | |
313 | } | |
314 | ||
315 | p = message; | |
316 | left = strlen(message); | |
317 | ||
318 | end = now(CLOCK_MONOTONIC) + TIMEOUT_MSEC*USEC_PER_MSEC; | |
319 | ||
320 | while (left > 0) { | |
321 | ssize_t n; | |
322 | struct pollfd pollfd; | |
323 | usec_t t; | |
324 | int k; | |
325 | ||
326 | t = now(CLOCK_MONOTONIC); | |
327 | ||
328 | if (t >= end) { | |
329 | r = -ETIME; | |
330 | goto finish; | |
331 | } | |
332 | ||
333 | zero(pollfd); | |
334 | pollfd.fd = fd; | |
335 | pollfd.events = POLLOUT; | |
336 | ||
337 | if ((k = poll(&pollfd, 1, (end - t) / USEC_PER_MSEC)) < 0) | |
338 | return -errno; | |
339 | ||
340 | if (k <= 0) { | |
341 | r = -ETIME; | |
342 | goto finish; | |
343 | } | |
344 | ||
345 | if ((n = write(fd, p, left)) < 0) { | |
346 | ||
347 | if (errno == EAGAIN) | |
348 | continue; | |
349 | ||
350 | r = -errno; | |
351 | goto finish; | |
352 | } | |
353 | ||
354 | assert((size_t) n <= left); | |
355 | ||
356 | p += n; | |
357 | left -= n; | |
358 | } | |
359 | ||
360 | r = 0; | |
361 | ||
362 | finish: | |
363 | close_nointr_nofail(fd); | |
364 | ||
365 | return r; | |
366 | } | |
367 | ||
7af53310 | 368 | int utmp_wall(const char *message, bool (*match_tty)(const char *tty)) { |
ef2f1067 | 369 | struct utmpx *u; |
11620592 | 370 | char date[FORMAT_TIMESTAMP_MAX]; |
629c210d | 371 | char *text = NULL, *hn = NULL, *un = NULL, *tty = NULL; |
ef2f1067 | 372 | int r; |
ef2f1067 LP |
373 | |
374 | if (!(hn = gethostname_malloc()) || | |
8c6db833 | 375 | !(un = getlogname_malloc())) { |
ef2f1067 LP |
376 | r = -ENOMEM; |
377 | goto finish; | |
378 | } | |
379 | ||
fc116c6a | 380 | getttyname_harder(STDIN_FILENO, &tty); |
ef2f1067 LP |
381 | |
382 | if (asprintf(&text, | |
383 | "\a\r\n" | |
11620592 | 384 | "Broadcast message from %s@%s%s%s (%s):\r\n\r\n" |
ef2f1067 | 385 | "%s\r\n\r\n", |
11620592 LP |
386 | un, hn, |
387 | tty ? " on " : "", strempty(tty), | |
388 | format_timestamp(date, sizeof(date), now(CLOCK_REALTIME)), | |
389 | message) < 0) { | |
ef2f1067 LP |
390 | r = -ENOMEM; |
391 | goto finish; | |
392 | } | |
393 | ||
394 | setutxent(); | |
395 | ||
396 | r = 0; | |
397 | ||
398 | while ((u = getutxent())) { | |
399 | int q; | |
400 | const char *path; | |
401 | char *buf = NULL; | |
402 | ||
403 | if (u->ut_type != USER_PROCESS || u->ut_user[0] == 0) | |
404 | continue; | |
405 | ||
406 | if (path_startswith(u->ut_line, "/dev/")) | |
407 | path = u->ut_line; | |
408 | else { | |
409 | if (asprintf(&buf, "/dev/%s", u->ut_line) < 0) { | |
410 | r = -ENOMEM; | |
411 | goto finish; | |
412 | } | |
413 | ||
414 | path = buf; | |
415 | } | |
416 | ||
7af53310 LP |
417 | if (!match_tty || match_tty(path)) |
418 | if ((q = write_to_terminal(path, text)) < 0) | |
419 | r = q; | |
ef2f1067 LP |
420 | |
421 | free(buf); | |
422 | } | |
423 | ||
424 | finish: | |
425 | free(hn); | |
426 | free(un); | |
427 | free(tty); | |
428 | free(text); | |
429 | ||
430 | return r; | |
431 | } |