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