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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
0b7964b8 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
8 | under the terms of the GNU Lesser General Public License as published by |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
0b7964b8 LP |
10 | (at your option) any later version. |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 15 | Lesser General Public License for more details. |
0b7964b8 | 16 | |
5430f7f2 | 17 | You should have received a copy of the GNU Lesser General Public License |
0b7964b8 LP |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
19 | ***/ | |
20 | ||
cf0fbc49 | 21 | #include <ctype.h> |
0b7964b8 | 22 | #include <errno.h> |
cf0fbc49 | 23 | #include <stdio.h> |
0b7964b8 | 24 | #include <sys/epoll.h> |
cf0fbc49 | 25 | #include <unistd.h> |
0b7964b8 | 26 | |
b75b4db0 | 27 | #include "sd-bus.h" |
3ffd4af2 | 28 | #include "sd-daemon.h" |
0b7964b8 | 29 | |
b5efdb8a | 30 | #include "alloc-util.h" |
b75b4db0 | 31 | #include "bus-error.h" |
3ffd4af2 | 32 | #include "bus-util.h" |
ef9eb0a8 | 33 | #include "def.h" |
3ffd4af2 | 34 | #include "fd-util.h" |
f97b34a6 | 35 | #include "format-util.h" |
3ffd4af2 LP |
36 | #include "initreq.h" |
37 | #include "list.h" | |
38 | #include "log.h" | |
39 | #include "special.h" | |
40 | #include "util.h" | |
dccca82b | 41 | #include "process-util.h" |
0b7964b8 | 42 | |
0b7964b8 | 43 | #define SERVER_FD_MAX 16 |
ef9eb0a8 | 44 | #define TIMEOUT_MSEC ((int) (DEFAULT_EXIT_USEC/USEC_PER_MSEC)) |
0b7964b8 LP |
45 | |
46 | typedef struct Fifo Fifo; | |
47 | ||
48 | typedef struct Server { | |
49 | int epoll_fd; | |
50 | ||
51 | LIST_HEAD(Fifo, fifos); | |
52 | unsigned n_fifos; | |
53 | ||
b75b4db0 | 54 | sd_bus *bus; |
f632a663 LP |
55 | |
56 | bool quit; | |
0b7964b8 LP |
57 | } Server; |
58 | ||
59 | struct Fifo { | |
60 | Server *server; | |
61 | ||
62 | int fd; | |
63 | ||
64 | struct init_request buffer; | |
65 | size_t bytes_read; | |
66 | ||
67 | LIST_FIELDS(Fifo, fifo); | |
68 | }; | |
69 | ||
ac83842a | 70 | static const char *translate_runlevel(int runlevel, bool *isolate) { |
6542952f LP |
71 | static const struct { |
72 | const int runlevel; | |
73 | const char *special; | |
ac83842a | 74 | bool isolate; |
6542952f | 75 | } table[] = { |
d5d8429a LP |
76 | { '0', SPECIAL_POWEROFF_TARGET, false }, |
77 | { '1', SPECIAL_RESCUE_TARGET, true }, | |
78 | { 's', SPECIAL_RESCUE_TARGET, true }, | |
79 | { 'S', SPECIAL_RESCUE_TARGET, true }, | |
80 | { '2', SPECIAL_MULTI_USER_TARGET, true }, | |
81 | { '3', SPECIAL_MULTI_USER_TARGET, true }, | |
82 | { '4', SPECIAL_MULTI_USER_TARGET, true }, | |
83 | { '5', SPECIAL_GRAPHICAL_TARGET, true }, | |
84 | { '6', SPECIAL_REBOOT_TARGET, false }, | |
6542952f LP |
85 | }; |
86 | ||
87 | unsigned i; | |
88 | ||
ac83842a LP |
89 | assert(isolate); |
90 | ||
6542952f | 91 | for (i = 0; i < ELEMENTSOF(table); i++) |
ac83842a LP |
92 | if (table[i].runlevel == runlevel) { |
93 | *isolate = table[i].isolate; | |
65457142 FC |
94 | if (runlevel == '6' && kexec_loaded()) |
95 | return SPECIAL_KEXEC_TARGET; | |
6542952f | 96 | return table[i].special; |
ac83842a | 97 | } |
6542952f LP |
98 | |
99 | return NULL; | |
0b7964b8 LP |
100 | } |
101 | ||
102 | static void change_runlevel(Server *s, int runlevel) { | |
103 | const char *target; | |
4afd3348 | 104 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
ac83842a LP |
105 | const char *mode; |
106 | bool isolate = false; | |
b75b4db0 | 107 | int r; |
0b7964b8 LP |
108 | |
109 | assert(s); | |
110 | ||
b75b4db0 | 111 | target = translate_runlevel(runlevel, &isolate); |
f168c273 | 112 | if (!target) { |
0b7964b8 | 113 | log_warning("Got request for unknown runlevel %c, ignoring.", runlevel); |
b75b4db0 | 114 | return; |
0b7964b8 LP |
115 | } |
116 | ||
ac83842a LP |
117 | if (isolate) |
118 | mode = "isolate"; | |
119 | else | |
4c10771c | 120 | mode = "replace-irreversibly"; |
ac83842a | 121 | |
6f0d624e | 122 | log_debug("Running request %s/start/%s", target, mode); |
0b7964b8 | 123 | |
b75b4db0 TG |
124 | r = sd_bus_call_method( |
125 | s->bus, | |
126 | "org.freedesktop.systemd1", | |
127 | "/org/freedesktop/systemd1", | |
128 | "org.freedesktop.systemd1.Manager", | |
129 | "StartUnit", | |
130 | &error, | |
131 | NULL, | |
132 | "ss", target, mode); | |
133 | if (r < 0) { | |
134 | log_error("Failed to change runlevel: %s", bus_error_message(&error, -r)); | |
135 | return; | |
0b7964b8 | 136 | } |
0b7964b8 LP |
137 | } |
138 | ||
139 | static void request_process(Server *s, const struct init_request *req) { | |
140 | assert(s); | |
141 | assert(req); | |
142 | ||
143 | if (req->magic != INIT_MAGIC) { | |
144 | log_error("Got initctl request with invalid magic. Ignoring."); | |
145 | return; | |
146 | } | |
147 | ||
148 | switch (req->cmd) { | |
149 | ||
150 | case INIT_CMD_RUNLVL: | |
151 | if (!isprint(req->runlevel)) | |
152 | log_error("Got invalid runlevel. Ignoring."); | |
153 | else | |
46e964c5 TG |
154 | switch (req->runlevel) { |
155 | ||
156 | /* we are async anyway, so just use kill for reexec/reload */ | |
157 | case 'u': | |
158 | case 'U': | |
159 | if (kill(1, SIGTERM) < 0) | |
56f64d95 | 160 | log_error_errno(errno, "kill() failed: %m"); |
f632a663 LP |
161 | |
162 | /* The bus connection will be | |
163 | * terminated if PID 1 is reexecuted, | |
164 | * hence let's just exit here, and | |
165 | * rely on that we'll be restarted on | |
166 | * the next request */ | |
167 | s->quit = true; | |
46e964c5 TG |
168 | break; |
169 | ||
170 | case 'q': | |
171 | case 'Q': | |
172 | if (kill(1, SIGHUP) < 0) | |
56f64d95 | 173 | log_error_errno(errno, "kill() failed: %m"); |
46e964c5 TG |
174 | break; |
175 | ||
176 | default: | |
177 | change_runlevel(s, req->runlevel); | |
178 | } | |
0b7964b8 LP |
179 | return; |
180 | ||
181 | case INIT_CMD_POWERFAIL: | |
182 | case INIT_CMD_POWERFAILNOW: | |
183 | case INIT_CMD_POWEROK: | |
184 | log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!"); | |
185 | return; | |
186 | ||
187 | case INIT_CMD_CHANGECONS: | |
188 | log_warning("Received console change initctl request. This is not implemented in systemd."); | |
189 | return; | |
190 | ||
191 | case INIT_CMD_SETENV: | |
192 | case INIT_CMD_UNSETENV: | |
193 | log_warning("Received environment initctl request. This is not implemented in systemd."); | |
194 | return; | |
195 | ||
196 | default: | |
197 | log_warning("Received unknown initctl request. Ignoring."); | |
198 | return; | |
199 | } | |
200 | } | |
201 | ||
202 | static int fifo_process(Fifo *f) { | |
203 | ssize_t l; | |
204 | ||
205 | assert(f); | |
206 | ||
207 | errno = EIO; | |
289f910e ZJS |
208 | l = read(f->fd, |
209 | ((uint8_t*) &f->buffer) + f->bytes_read, | |
210 | sizeof(f->buffer) - f->bytes_read); | |
211 | if (l <= 0) { | |
0b7964b8 LP |
212 | if (errno == EAGAIN) |
213 | return 0; | |
214 | ||
e1427b13 | 215 | return log_warning_errno(errno, "Failed to read from fifo: %m"); |
0b7964b8 LP |
216 | } |
217 | ||
218 | f->bytes_read += l; | |
219 | assert(f->bytes_read <= sizeof(f->buffer)); | |
220 | ||
221 | if (f->bytes_read == sizeof(f->buffer)) { | |
222 | request_process(f->server, &f->buffer); | |
223 | f->bytes_read = 0; | |
224 | } | |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
229 | static void fifo_free(Fifo *f) { | |
230 | assert(f); | |
231 | ||
232 | if (f->server) { | |
233 | assert(f->server->n_fifos > 0); | |
234 | f->server->n_fifos--; | |
71fda00f | 235 | LIST_REMOVE(fifo, f->server->fifos, f); |
0b7964b8 LP |
236 | } |
237 | ||
238 | if (f->fd >= 0) { | |
239 | if (f->server) | |
240 | epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL); | |
241 | ||
03e334a1 | 242 | safe_close(f->fd); |
0b7964b8 LP |
243 | } |
244 | ||
245 | free(f); | |
246 | } | |
247 | ||
0b7964b8 LP |
248 | static void server_done(Server *s) { |
249 | assert(s); | |
250 | ||
251 | while (s->fifos) | |
252 | fifo_free(s->fifos); | |
253 | ||
03e334a1 | 254 | safe_close(s->epoll_fd); |
0b7964b8 | 255 | |
fb1af5b0 | 256 | if (s->bus) { |
b75b4db0 TG |
257 | sd_bus_flush(s->bus); |
258 | sd_bus_unref(s->bus); | |
fb1af5b0 | 259 | } |
0b7964b8 LP |
260 | } |
261 | ||
262 | static int server_init(Server *s, unsigned n_sockets) { | |
263 | int r; | |
264 | unsigned i; | |
0b7964b8 LP |
265 | |
266 | assert(s); | |
267 | assert(n_sockets > 0); | |
268 | ||
0b7964b8 LP |
269 | zero(*s); |
270 | ||
3143987f ZJS |
271 | s->epoll_fd = epoll_create1(EPOLL_CLOEXEC); |
272 | if (s->epoll_fd < 0) { | |
76ef789d LP |
273 | r = log_error_errno(errno, |
274 | "Failed to create epoll object: %m"); | |
0b7964b8 LP |
275 | goto fail; |
276 | } | |
277 | ||
278 | for (i = 0; i < n_sockets; i++) { | |
279 | struct epoll_event ev; | |
280 | Fifo *f; | |
7c394faa LP |
281 | int fd; |
282 | ||
283 | fd = SD_LISTEN_FDS_START+i; | |
284 | ||
3143987f ZJS |
285 | r = sd_is_fifo(fd, NULL); |
286 | if (r < 0) { | |
c33b3297 | 287 | log_error_errno(r, "Failed to determine file descriptor type: %m"); |
7c394faa LP |
288 | goto fail; |
289 | } | |
290 | ||
291 | if (!r) { | |
292 | log_error("Wrong file descriptor type."); | |
293 | r = -EINVAL; | |
294 | goto fail; | |
295 | } | |
0b7964b8 | 296 | |
3143987f ZJS |
297 | f = new0(Fifo, 1); |
298 | if (!f) { | |
0b7964b8 | 299 | r = -ENOMEM; |
56f64d95 | 300 | log_error_errno(errno, "Failed to create fifo object: %m"); |
0b7964b8 LP |
301 | goto fail; |
302 | } | |
303 | ||
304 | f->fd = -1; | |
305 | ||
306 | zero(ev); | |
307 | ev.events = EPOLLIN; | |
308 | ev.data.ptr = f; | |
7c394faa | 309 | if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) { |
0b7964b8 LP |
310 | r = -errno; |
311 | fifo_free(f); | |
56f64d95 | 312 | log_error_errno(errno, "Failed to add fifo fd to epoll object: %m"); |
0b7964b8 LP |
313 | goto fail; |
314 | } | |
315 | ||
63983207 | 316 | f->fd = fd; |
71fda00f | 317 | LIST_PREPEND(fifo, s->fifos, f); |
0b7964b8 | 318 | f->server = s; |
313cefa1 | 319 | s->n_fifos++; |
0b7964b8 LP |
320 | } |
321 | ||
266f3e26 | 322 | r = bus_connect_system_systemd(&s->bus); |
b75b4db0 | 323 | if (r < 0) { |
da927ba9 | 324 | log_error_errno(r, "Failed to get D-Bus connection: %m"); |
3143987f | 325 | r = -EIO; |
0b7964b8 LP |
326 | goto fail; |
327 | } | |
328 | ||
329 | return 0; | |
330 | ||
331 | fail: | |
332 | server_done(s); | |
333 | ||
0b7964b8 LP |
334 | return r; |
335 | } | |
336 | ||
337 | static int process_event(Server *s, struct epoll_event *ev) { | |
338 | int r; | |
339 | Fifo *f; | |
340 | ||
341 | assert(s); | |
342 | ||
343 | if (!(ev->events & EPOLLIN)) { | |
344 | log_info("Got invalid event from epoll. (3)"); | |
345 | return -EIO; | |
346 | } | |
347 | ||
348 | f = (Fifo*) ev->data.ptr; | |
289f910e ZJS |
349 | r = fifo_process(f); |
350 | if (r < 0) { | |
da927ba9 | 351 | log_info_errno(r, "Got error on fifo: %m"); |
0b7964b8 LP |
352 | fifo_free(f); |
353 | return r; | |
354 | } | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
359 | int main(int argc, char *argv[]) { | |
360 | Server server; | |
22f4096c | 361 | int r = EXIT_FAILURE, n; |
8bfcc8ea | 362 | |
0ca3f374 LP |
363 | if (getppid() != 1) { |
364 | log_error("This program should be invoked by init only."); | |
22f4096c | 365 | return EXIT_FAILURE; |
0ca3f374 LP |
366 | } |
367 | ||
368 | if (argc > 1) { | |
369 | log_error("This program does not take arguments."); | |
22f4096c | 370 | return EXIT_FAILURE; |
0ca3f374 LP |
371 | } |
372 | ||
4cfa2c99 | 373 | log_set_target(LOG_TARGET_AUTO); |
8bfcc8ea | 374 | log_parse_environment(); |
2396fb04 | 375 | log_open(); |
0b7964b8 | 376 | |
4c12626c LP |
377 | umask(0022); |
378 | ||
82d25240 LP |
379 | n = sd_listen_fds(true); |
380 | if (n < 0) { | |
da927ba9 | 381 | log_error_errno(r, "Failed to read listening file descriptors from environment: %m"); |
22f4096c | 382 | return EXIT_FAILURE; |
8bfcc8ea LP |
383 | } |
384 | ||
385 | if (n <= 0 || n > SERVER_FD_MAX) { | |
386 | log_error("No or too many file descriptors passed."); | |
22f4096c | 387 | return EXIT_FAILURE; |
8bfcc8ea | 388 | } |
0b7964b8 | 389 | |
8bfcc8ea | 390 | if (server_init(&server, (unsigned) n) < 0) |
22f4096c | 391 | return EXIT_FAILURE; |
0b7964b8 | 392 | |
df0ff127 | 393 | log_debug("systemd-initctl running as pid "PID_FMT, getpid_cached()); |
cd6d0a45 | 394 | |
8c47c732 LP |
395 | sd_notify(false, |
396 | "READY=1\n" | |
397 | "STATUS=Processing requests..."); | |
398 | ||
f632a663 | 399 | while (!server.quit) { |
0b7964b8 LP |
400 | struct epoll_event event; |
401 | int k; | |
402 | ||
3cc2aff1 LP |
403 | k = epoll_wait(server.epoll_fd, &event, 1, TIMEOUT_MSEC); |
404 | if (k < 0) { | |
0b7964b8 LP |
405 | if (errno == EINTR) |
406 | continue; | |
56f64d95 | 407 | log_error_errno(errno, "epoll_wait() failed: %m"); |
0b7964b8 LP |
408 | goto fail; |
409 | } | |
410 | ||
411 | if (k <= 0) | |
412 | break; | |
413 | ||
e364ad06 | 414 | if (process_event(&server, &event) < 0) |
0b7964b8 LP |
415 | goto fail; |
416 | } | |
cd6d0a45 | 417 | |
22f4096c | 418 | r = EXIT_SUCCESS; |
0b7964b8 | 419 | |
df0ff127 | 420 | log_debug("systemd-initctl stopped as pid "PID_FMT, getpid_cached()); |
cd6d0a45 | 421 | |
0b7964b8 | 422 | fail: |
8c47c732 | 423 | sd_notify(false, |
af4ec430 | 424 | "STOPPING=1\n" |
8c47c732 LP |
425 | "STATUS=Shutting down..."); |
426 | ||
0b7964b8 LP |
427 | server_done(&server); |
428 | ||
0b7964b8 LP |
429 | return r; |
430 | } |