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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
e537352b LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
e537352b LP |
6 | ***/ |
7 | ||
e537352b | 8 | #include <errno.h> |
07630cea LP |
9 | #include <fcntl.h> |
10 | #include <poll.h> | |
a8fbdf54 TA |
11 | #include <stddef.h> |
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
e537352b | 14 | #include <string.h> |
a8fbdf54 | 15 | #include <sys/time.h> |
e537352b | 16 | #include <sys/utsname.h> |
ef2f1067 | 17 | #include <unistd.h> |
07630cea | 18 | #include <utmpx.h> |
e537352b | 19 | |
b5efdb8a | 20 | #include "alloc-util.h" |
3ffd4af2 | 21 | #include "fd-util.h" |
07630cea | 22 | #include "hostname-util.h" |
e537352b | 23 | #include "macro.h" |
9eb977db | 24 | #include "path-util.h" |
07630cea | 25 | #include "string-util.h" |
288a74cc | 26 | #include "terminal-util.h" |
a8fbdf54 | 27 | #include "time-util.h" |
b1d4f8e1 | 28 | #include "user-util.h" |
a8fbdf54 | 29 | #include "util.h" |
958b66ea | 30 | #include "utmp-wtmp.h" |
e537352b LP |
31 | |
32 | int utmp_get_runlevel(int *runlevel, int *previous) { | |
b92bea5d | 33 | struct utmpx *found, lookup = { .ut_type = RUN_LVL }; |
e537352b LP |
34 | int r; |
35 | const char *e; | |
36 | ||
37 | assert(runlevel); | |
38 | ||
39 | /* If these values are set in the environment this takes | |
40 | * precedence. Presumably, sysvinit does this to work around a | |
41 | * race condition that would otherwise exist where we'd always | |
42 | * go to disk and hence might read runlevel data that might be | |
43 | * very new and does not apply to the current script being | |
44 | * executed. */ | |
45 | ||
e7fb33ff LP |
46 | e = getenv("RUNLEVEL"); |
47 | if (e && e[0] > 0) { | |
e537352b LP |
48 | *runlevel = e[0]; |
49 | ||
50 | if (previous) { | |
51 | /* $PREVLEVEL seems to be an Upstart thing */ | |
52 | ||
e7fb33ff LP |
53 | e = getenv("PREVLEVEL"); |
54 | if (e && e[0] > 0) | |
e537352b LP |
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 | ||
e7fb33ff LP |
68 | found = getutxid(&lookup); |
69 | if (!found) | |
e537352b LP |
70 | r = -errno; |
71 | else { | |
72 | int a, b; | |
73 | ||
74 | a = found->ut_pid & 0xFF; | |
75 | b = (found->ut_pid >> 8) & 0xFF; | |
76 | ||
4dd1de72 ZJS |
77 | *runlevel = a; |
78 | if (previous) | |
79 | *previous = b; | |
80 | ||
81 | r = 0; | |
e537352b LP |
82 | } |
83 | ||
84 | endutxent(); | |
85 | ||
86 | return r; | |
87 | } | |
88 | ||
169c1bda | 89 | static void init_timestamp(struct utmpx *store, usec_t t) { |
e537352b LP |
90 | assert(store); |
91 | ||
871d7de4 LP |
92 | if (t <= 0) |
93 | t = now(CLOCK_REALTIME); | |
e537352b | 94 | |
871d7de4 LP |
95 | store->ut_tv.tv_sec = t / USEC_PER_SEC; |
96 | store->ut_tv.tv_usec = t % USEC_PER_SEC; | |
169c1bda LP |
97 | } |
98 | ||
99 | static void init_entry(struct utmpx *store, usec_t t) { | |
b92bea5d | 100 | struct utsname uts = {}; |
169c1bda LP |
101 | |
102 | assert(store); | |
103 | ||
104 | init_timestamp(store, t); | |
105 | ||
e537352b LP |
106 | if (uname(&uts) >= 0) |
107 | strncpy(store->ut_host, uts.release, sizeof(store->ut_host)); | |
108 | ||
109 | strncpy(store->ut_line, "~", sizeof(store->ut_line)); /* or ~~ ? */ | |
110 | strncpy(store->ut_id, "~~", sizeof(store->ut_id)); | |
111 | } | |
112 | ||
113 | static int write_entry_utmp(const struct utmpx *store) { | |
114 | int r; | |
115 | ||
116 | assert(store); | |
117 | ||
118 | /* utmp is similar to wtmp, but there is only one entry for | |
119 | * each entry type resp. user; i.e. basically a key/value | |
120 | * table. */ | |
121 | ||
122 | if (utmpxname(_PATH_UTMPX) < 0) | |
123 | return -errno; | |
124 | ||
125 | setutxent(); | |
126 | ||
127 | if (!pututxline(store)) | |
128 | r = -errno; | |
129 | else | |
130 | r = 0; | |
131 | ||
132 | endutxent(); | |
133 | ||
134 | return r; | |
135 | } | |
136 | ||
137 | static int write_entry_wtmp(const struct utmpx *store) { | |
138 | assert(store); | |
139 | ||
140 | /* wtmp is a simple append-only file where each entry is | |
863f3ce0 | 141 | simply appended to the end; i.e. basically a log. */ |
e537352b LP |
142 | |
143 | errno = 0; | |
144 | updwtmpx(_PATH_WTMPX, store); | |
145 | return -errno; | |
146 | } | |
147 | ||
4743137a | 148 | static int write_utmp_wtmp(const struct utmpx *store_utmp, const struct utmpx *store_wtmp) { |
e537352b LP |
149 | int r, s; |
150 | ||
4743137a MS |
151 | r = write_entry_utmp(store_utmp); |
152 | s = write_entry_wtmp(store_wtmp); | |
e537352b LP |
153 | |
154 | if (r >= 0) | |
155 | r = s; | |
156 | ||
157 | /* If utmp/wtmp have been disabled, that's a good thing, hence | |
158 | * ignore the errors */ | |
159 | if (r == -ENOENT) | |
160 | r = 0; | |
161 | ||
162 | return r; | |
163 | } | |
164 | ||
4743137a MS |
165 | static int write_entry_both(const struct utmpx *store) { |
166 | return write_utmp_wtmp(store, store); | |
167 | } | |
168 | ||
0ad26e09 | 169 | int utmp_put_shutdown(void) { |
863f3ce0 | 170 | struct utmpx store = {}; |
e537352b | 171 | |
0ad26e09 | 172 | init_entry(&store, 0); |
e537352b LP |
173 | |
174 | store.ut_type = RUN_LVL; | |
175 | strncpy(store.ut_user, "shutdown", sizeof(store.ut_user)); | |
176 | ||
177 | return write_entry_both(&store); | |
178 | } | |
179 | ||
871d7de4 | 180 | int utmp_put_reboot(usec_t t) { |
863f3ce0 | 181 | struct utmpx store = {}; |
e537352b | 182 | |
871d7de4 | 183 | init_entry(&store, t); |
e537352b LP |
184 | |
185 | store.ut_type = BOOT_TIME; | |
55e39f40 | 186 | strncpy(store.ut_user, "reboot", sizeof(store.ut_user)); |
e537352b LP |
187 | |
188 | return write_entry_both(&store); | |
189 | } | |
190 | ||
44a6b1b6 | 191 | _pure_ static const char *sanitize_id(const char *id) { |
169c1bda LP |
192 | size_t l; |
193 | ||
194 | assert(id); | |
195 | l = strlen(id); | |
196 | ||
197 | if (l <= sizeof(((struct utmpx*) NULL)->ut_id)) | |
198 | return id; | |
199 | ||
200 | return id + l - sizeof(((struct utmpx*) NULL)->ut_id); | |
201 | } | |
202 | ||
023a4f67 | 203 | int utmp_put_init_process(const char *id, pid_t pid, pid_t sid, const char *line, int ut_type, const char *user) { |
863f3ce0 TG |
204 | struct utmpx store = { |
205 | .ut_type = INIT_PROCESS, | |
206 | .ut_pid = pid, | |
207 | .ut_session = sid, | |
208 | }; | |
023a4f67 | 209 | int r; |
169c1bda LP |
210 | |
211 | assert(id); | |
212 | ||
0ad26e09 | 213 | init_timestamp(&store, 0); |
169c1bda | 214 | |
863f3ce0 | 215 | /* ut_id needs only be nul-terminated if it is shorter than sizeof(ut_id) */ |
169c1bda LP |
216 | strncpy(store.ut_id, sanitize_id(id), sizeof(store.ut_id)); |
217 | ||
218 | if (line) | |
2b6bf07d | 219 | strncpy(store.ut_line, basename(line), sizeof(store.ut_line)); |
169c1bda | 220 | |
023a4f67 LP |
221 | r = write_entry_both(&store); |
222 | if (r < 0) | |
223 | return r; | |
224 | ||
3742095b | 225 | if (IN_SET(ut_type, LOGIN_PROCESS, USER_PROCESS)) { |
023a4f67 LP |
226 | store.ut_type = LOGIN_PROCESS; |
227 | r = write_entry_both(&store); | |
228 | if (r < 0) | |
229 | return r; | |
230 | } | |
231 | ||
232 | if (ut_type == USER_PROCESS) { | |
233 | store.ut_type = USER_PROCESS; | |
234 | strncpy(store.ut_user, user, sizeof(store.ut_user)-1); | |
235 | r = write_entry_both(&store); | |
236 | if (r < 0) | |
237 | return r; | |
238 | } | |
239 | ||
240 | return 0; | |
169c1bda LP |
241 | } |
242 | ||
243 | int utmp_put_dead_process(const char *id, pid_t pid, int code, int status) { | |
863f3ce0 TG |
244 | struct utmpx lookup = { |
245 | .ut_type = INIT_PROCESS /* looks for DEAD_PROCESS, LOGIN_PROCESS, USER_PROCESS, too */ | |
246 | }, store, store_wtmp, *found; | |
169c1bda LP |
247 | |
248 | assert(id); | |
249 | ||
250 | setutxent(); | |
251 | ||
863f3ce0 | 252 | /* ut_id needs only be nul-terminated if it is shorter than sizeof(ut_id) */ |
169c1bda LP |
253 | strncpy(lookup.ut_id, sanitize_id(id), sizeof(lookup.ut_id)); |
254 | ||
e7fb33ff LP |
255 | found = getutxid(&lookup); |
256 | if (!found) | |
169c1bda LP |
257 | return 0; |
258 | ||
259 | if (found->ut_pid != pid) | |
260 | return 0; | |
261 | ||
fa4ad7ce | 262 | memcpy(&store, found, sizeof(store)); |
169c1bda LP |
263 | store.ut_type = DEAD_PROCESS; |
264 | store.ut_exit.e_termination = code; | |
265 | store.ut_exit.e_exit = status; | |
266 | ||
267 | zero(store.ut_user); | |
268 | zero(store.ut_host); | |
269 | zero(store.ut_tv); | |
270 | ||
4743137a MS |
271 | memcpy(&store_wtmp, &store, sizeof(store_wtmp)); |
272 | /* wtmp wants the current time */ | |
273 | init_timestamp(&store_wtmp, 0); | |
274 | ||
275 | return write_utmp_wtmp(&store, &store_wtmp); | |
169c1bda LP |
276 | } |
277 | ||
278 | ||
0ad26e09 | 279 | int utmp_put_runlevel(int runlevel, int previous) { |
863f3ce0 | 280 | struct utmpx store = {}; |
e537352b LP |
281 | int r; |
282 | ||
283 | assert(runlevel > 0); | |
284 | ||
285 | if (previous <= 0) { | |
286 | /* Find the old runlevel automatically */ | |
287 | ||
e7fb33ff LP |
288 | r = utmp_get_runlevel(&previous, NULL); |
289 | if (r < 0) { | |
d7fc909d LP |
290 | if (r != -ESRCH) |
291 | return r; | |
292 | ||
293 | previous = 0; | |
294 | } | |
e537352b LP |
295 | } |
296 | ||
4927fcae LP |
297 | if (previous == runlevel) |
298 | return 0; | |
299 | ||
0ad26e09 | 300 | init_entry(&store, 0); |
e537352b LP |
301 | |
302 | store.ut_type = RUN_LVL; | |
303 | store.ut_pid = (runlevel & 0xFF) | ((previous & 0xFF) << 8); | |
304 | strncpy(store.ut_user, "runlevel", sizeof(store.ut_user)); | |
305 | ||
306 | return write_entry_both(&store); | |
307 | } | |
ef2f1067 LP |
308 | |
309 | #define TIMEOUT_MSEC 50 | |
310 | ||
311 | static int write_to_terminal(const char *tty, const char *message) { | |
7fd1b19b | 312 | _cleanup_close_ int fd = -1; |
ef2f1067 LP |
313 | const char *p; |
314 | size_t left; | |
315 | usec_t end; | |
316 | ||
317 | assert(tty); | |
318 | assert(message); | |
319 | ||
db4a47e9 | 320 | fd = open(tty, O_WRONLY|O_NONBLOCK|O_NOCTTY|O_CLOEXEC); |
e62d8c39 | 321 | if (fd < 0 || !isatty(fd)) |
ef2f1067 LP |
322 | return -errno; |
323 | ||
ef2f1067 LP |
324 | p = message; |
325 | left = strlen(message); | |
326 | ||
327 | end = now(CLOCK_MONOTONIC) + TIMEOUT_MSEC*USEC_PER_MSEC; | |
328 | ||
329 | while (left > 0) { | |
330 | ssize_t n; | |
b92bea5d ZJS |
331 | struct pollfd pollfd = { |
332 | .fd = fd, | |
333 | .events = POLLOUT, | |
334 | }; | |
ef2f1067 LP |
335 | usec_t t; |
336 | int k; | |
337 | ||
338 | t = now(CLOCK_MONOTONIC); | |
339 | ||
e62d8c39 ZJS |
340 | if (t >= end) |
341 | return -ETIME; | |
ef2f1067 | 342 | |
e62d8c39 ZJS |
343 | k = poll(&pollfd, 1, (end - t) / USEC_PER_MSEC); |
344 | if (k < 0) | |
ef2f1067 LP |
345 | return -errno; |
346 | ||
e62d8c39 ZJS |
347 | if (k == 0) |
348 | return -ETIME; | |
ef2f1067 | 349 | |
e62d8c39 ZJS |
350 | n = write(fd, p, left); |
351 | if (n < 0) { | |
ef2f1067 LP |
352 | if (errno == EAGAIN) |
353 | continue; | |
354 | ||
e62d8c39 | 355 | return -errno; |
ef2f1067 LP |
356 | } |
357 | ||
358 | assert((size_t) n <= left); | |
359 | ||
360 | p += n; | |
361 | left -= n; | |
362 | } | |
363 | ||
e62d8c39 | 364 | return 0; |
ef2f1067 LP |
365 | } |
366 | ||
99f710dd DM |
367 | int utmp_wall( |
368 | const char *message, | |
369 | const char *username, | |
370 | const char *origin_tty, | |
371 | bool (*match_tty)(const char *tty, void *userdata), | |
372 | void *userdata) { | |
373 | ||
374 | _cleanup_free_ char *text = NULL, *hn = NULL, *un = NULL, *stdin_tty = NULL; | |
11620592 | 375 | char date[FORMAT_TIMESTAMP_MAX]; |
e7fb33ff | 376 | struct utmpx *u; |
ef2f1067 | 377 | int r; |
ef2f1067 | 378 | |
e7fb33ff | 379 | hn = gethostname_malloc(); |
9003d9b0 | 380 | if (!hn) |
e7fb33ff | 381 | return -ENOMEM; |
9003d9b0 ST |
382 | if (!username) { |
383 | un = getlogname_malloc(); | |
384 | if (!un) | |
385 | return -ENOMEM; | |
386 | } | |
ef2f1067 | 387 | |
99f710dd DM |
388 | if (!origin_tty) { |
389 | getttyname_harder(STDIN_FILENO, &stdin_tty); | |
390 | origin_tty = stdin_tty; | |
391 | } | |
ef2f1067 LP |
392 | |
393 | if (asprintf(&text, | |
394 | "\a\r\n" | |
11620592 | 395 | "Broadcast message from %s@%s%s%s (%s):\r\n\r\n" |
ef2f1067 | 396 | "%s\r\n\r\n", |
9003d9b0 | 397 | un ?: username, hn, |
99f710dd | 398 | origin_tty ? " on " : "", strempty(origin_tty), |
11620592 | 399 | format_timestamp(date, sizeof(date), now(CLOCK_REALTIME)), |
e7fb33ff LP |
400 | message) < 0) |
401 | return -ENOMEM; | |
ef2f1067 LP |
402 | |
403 | setutxent(); | |
404 | ||
405 | r = 0; | |
406 | ||
407 | while ((u = getutxent())) { | |
e7fb33ff | 408 | _cleanup_free_ char *buf = NULL; |
ef2f1067 | 409 | const char *path; |
e7fb33ff | 410 | int q; |
ef2f1067 LP |
411 | |
412 | if (u->ut_type != USER_PROCESS || u->ut_user[0] == 0) | |
413 | continue; | |
414 | ||
fbd0b64f | 415 | /* this access is fine, because STRLEN("/dev/") << 32 (UT_LINESIZE) */ |
ef2f1067 LP |
416 | if (path_startswith(u->ut_line, "/dev/")) |
417 | path = u->ut_line; | |
418 | else { | |
e7fb33ff LP |
419 | if (asprintf(&buf, "/dev/%.*s", (int) sizeof(u->ut_line), u->ut_line) < 0) |
420 | return -ENOMEM; | |
ef2f1067 LP |
421 | |
422 | path = buf; | |
423 | } | |
424 | ||
99f710dd | 425 | if (!match_tty || match_tty(path, userdata)) { |
e7fb33ff LP |
426 | q = write_to_terminal(path, text); |
427 | if (q < 0) | |
7af53310 | 428 | r = q; |
e7fb33ff | 429 | } |
ef2f1067 LP |
430 | } |
431 | ||
ef2f1067 LP |
432 | return r; |
433 | } |