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663996b3 MS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
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 Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 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 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <sys/socket.h> | |
23 | #include <sys/types.h> | |
24 | #include <assert.h> | |
25 | #include <time.h> | |
26 | #include <string.h> | |
27 | #include <stdio.h> | |
28 | #include <errno.h> | |
29 | #include <unistd.h> | |
30 | #include <sys/poll.h> | |
31 | #include <sys/epoll.h> | |
32 | #include <sys/un.h> | |
33 | #include <fcntl.h> | |
34 | #include <ctype.h> | |
35 | ||
60f067b4 JS |
36 | #include "sd-daemon.h" |
37 | #include "sd-bus.h" | |
663996b3 MS |
38 | |
39 | #include "util.h" | |
40 | #include "log.h" | |
41 | #include "list.h" | |
42 | #include "initreq.h" | |
43 | #include "special.h" | |
60f067b4 JS |
44 | #include "bus-util.h" |
45 | #include "bus-error.h" | |
663996b3 MS |
46 | #include "def.h" |
47 | ||
48 | #define SERVER_FD_MAX 16 | |
49 | #define TIMEOUT_MSEC ((int) (DEFAULT_EXIT_USEC/USEC_PER_MSEC)) | |
50 | ||
51 | typedef struct Fifo Fifo; | |
52 | ||
53 | typedef struct Server { | |
54 | int epoll_fd; | |
55 | ||
56 | LIST_HEAD(Fifo, fifos); | |
57 | unsigned n_fifos; | |
58 | ||
60f067b4 | 59 | sd_bus *bus; |
663996b3 MS |
60 | |
61 | bool quit; | |
62 | } Server; | |
63 | ||
64 | struct Fifo { | |
65 | Server *server; | |
66 | ||
67 | int fd; | |
68 | ||
69 | struct init_request buffer; | |
70 | size_t bytes_read; | |
71 | ||
72 | LIST_FIELDS(Fifo, fifo); | |
73 | }; | |
74 | ||
75 | static const char *translate_runlevel(int runlevel, bool *isolate) { | |
76 | static const struct { | |
77 | const int runlevel; | |
78 | const char *special; | |
79 | bool isolate; | |
80 | } table[] = { | |
81 | { '0', SPECIAL_POWEROFF_TARGET, false }, | |
82 | { '1', SPECIAL_RESCUE_TARGET, true }, | |
83 | { 's', SPECIAL_RESCUE_TARGET, true }, | |
84 | { 'S', SPECIAL_RESCUE_TARGET, true }, | |
85 | { '2', SPECIAL_RUNLEVEL2_TARGET, true }, | |
86 | { '3', SPECIAL_RUNLEVEL3_TARGET, true }, | |
87 | { '4', SPECIAL_RUNLEVEL4_TARGET, true }, | |
88 | { '5', SPECIAL_RUNLEVEL5_TARGET, true }, | |
89 | { '6', SPECIAL_REBOOT_TARGET, false }, | |
90 | }; | |
91 | ||
92 | unsigned i; | |
93 | ||
94 | assert(isolate); | |
95 | ||
96 | for (i = 0; i < ELEMENTSOF(table); i++) | |
97 | if (table[i].runlevel == runlevel) { | |
98 | *isolate = table[i].isolate; | |
99 | if (runlevel == '6' && kexec_loaded()) | |
100 | return SPECIAL_KEXEC_TARGET; | |
101 | return table[i].special; | |
102 | } | |
103 | ||
104 | return NULL; | |
105 | } | |
106 | ||
107 | static void change_runlevel(Server *s, int runlevel) { | |
108 | const char *target; | |
60f067b4 | 109 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
663996b3 MS |
110 | const char *mode; |
111 | bool isolate = false; | |
60f067b4 | 112 | int r; |
663996b3 MS |
113 | |
114 | assert(s); | |
115 | ||
60f067b4 JS |
116 | target = translate_runlevel(runlevel, &isolate); |
117 | if (!target) { | |
663996b3 | 118 | log_warning("Got request for unknown runlevel %c, ignoring.", runlevel); |
60f067b4 | 119 | return; |
663996b3 MS |
120 | } |
121 | ||
122 | if (isolate) | |
123 | mode = "isolate"; | |
124 | else | |
14228c0d | 125 | mode = "replace-irreversibly"; |
663996b3 MS |
126 | |
127 | log_debug("Running request %s/start/%s", target, mode); | |
128 | ||
60f067b4 JS |
129 | r = sd_bus_call_method( |
130 | s->bus, | |
131 | "org.freedesktop.systemd1", | |
132 | "/org/freedesktop/systemd1", | |
133 | "org.freedesktop.systemd1.Manager", | |
134 | "StartUnit", | |
135 | &error, | |
136 | NULL, | |
137 | "ss", target, mode); | |
138 | if (r < 0) { | |
139 | log_error("Failed to change runlevel: %s", bus_error_message(&error, -r)); | |
140 | return; | |
663996b3 | 141 | } |
663996b3 MS |
142 | } |
143 | ||
144 | static void request_process(Server *s, const struct init_request *req) { | |
145 | assert(s); | |
146 | assert(req); | |
147 | ||
148 | if (req->magic != INIT_MAGIC) { | |
149 | log_error("Got initctl request with invalid magic. Ignoring."); | |
150 | return; | |
151 | } | |
152 | ||
153 | switch (req->cmd) { | |
154 | ||
155 | case INIT_CMD_RUNLVL: | |
156 | if (!isprint(req->runlevel)) | |
157 | log_error("Got invalid runlevel. Ignoring."); | |
158 | else | |
159 | switch (req->runlevel) { | |
160 | ||
161 | /* we are async anyway, so just use kill for reexec/reload */ | |
162 | case 'u': | |
163 | case 'U': | |
164 | if (kill(1, SIGTERM) < 0) | |
f47781d8 | 165 | log_error_errno(errno, "kill() failed: %m"); |
663996b3 MS |
166 | |
167 | /* The bus connection will be | |
168 | * terminated if PID 1 is reexecuted, | |
169 | * hence let's just exit here, and | |
170 | * rely on that we'll be restarted on | |
171 | * the next request */ | |
172 | s->quit = true; | |
173 | break; | |
174 | ||
175 | case 'q': | |
176 | case 'Q': | |
177 | if (kill(1, SIGHUP) < 0) | |
f47781d8 | 178 | log_error_errno(errno, "kill() failed: %m"); |
663996b3 MS |
179 | break; |
180 | ||
181 | default: | |
182 | change_runlevel(s, req->runlevel); | |
183 | } | |
184 | return; | |
185 | ||
186 | case INIT_CMD_POWERFAIL: | |
187 | case INIT_CMD_POWERFAILNOW: | |
188 | case INIT_CMD_POWEROK: | |
189 | log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!"); | |
190 | return; | |
191 | ||
192 | case INIT_CMD_CHANGECONS: | |
193 | log_warning("Received console change initctl request. This is not implemented in systemd."); | |
194 | return; | |
195 | ||
196 | case INIT_CMD_SETENV: | |
197 | case INIT_CMD_UNSETENV: | |
198 | log_warning("Received environment initctl request. This is not implemented in systemd."); | |
199 | return; | |
200 | ||
201 | default: | |
202 | log_warning("Received unknown initctl request. Ignoring."); | |
203 | return; | |
204 | } | |
205 | } | |
206 | ||
207 | static int fifo_process(Fifo *f) { | |
208 | ssize_t l; | |
209 | ||
210 | assert(f); | |
211 | ||
212 | errno = EIO; | |
14228c0d MB |
213 | l = read(f->fd, |
214 | ((uint8_t*) &f->buffer) + f->bytes_read, | |
215 | sizeof(f->buffer) - f->bytes_read); | |
216 | if (l <= 0) { | |
663996b3 MS |
217 | if (errno == EAGAIN) |
218 | return 0; | |
219 | ||
f47781d8 | 220 | log_warning_errno(errno, "Failed to read from fifo: %m"); |
5eef597e | 221 | return -errno; |
663996b3 MS |
222 | } |
223 | ||
224 | f->bytes_read += l; | |
225 | assert(f->bytes_read <= sizeof(f->buffer)); | |
226 | ||
227 | if (f->bytes_read == sizeof(f->buffer)) { | |
228 | request_process(f->server, &f->buffer); | |
229 | f->bytes_read = 0; | |
230 | } | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static void fifo_free(Fifo *f) { | |
236 | assert(f); | |
237 | ||
238 | if (f->server) { | |
239 | assert(f->server->n_fifos > 0); | |
240 | f->server->n_fifos--; | |
60f067b4 | 241 | LIST_REMOVE(fifo, f->server->fifos, f); |
663996b3 MS |
242 | } |
243 | ||
244 | if (f->fd >= 0) { | |
245 | if (f->server) | |
246 | epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL); | |
247 | ||
60f067b4 | 248 | safe_close(f->fd); |
663996b3 MS |
249 | } |
250 | ||
251 | free(f); | |
252 | } | |
253 | ||
254 | static void server_done(Server *s) { | |
255 | assert(s); | |
256 | ||
257 | while (s->fifos) | |
258 | fifo_free(s->fifos); | |
259 | ||
60f067b4 | 260 | safe_close(s->epoll_fd); |
663996b3 MS |
261 | |
262 | if (s->bus) { | |
60f067b4 JS |
263 | sd_bus_flush(s->bus); |
264 | sd_bus_unref(s->bus); | |
663996b3 MS |
265 | } |
266 | } | |
267 | ||
268 | static int server_init(Server *s, unsigned n_sockets) { | |
269 | int r; | |
270 | unsigned i; | |
663996b3 MS |
271 | |
272 | assert(s); | |
273 | assert(n_sockets > 0); | |
274 | ||
663996b3 MS |
275 | zero(*s); |
276 | ||
277 | s->epoll_fd = epoll_create1(EPOLL_CLOEXEC); | |
278 | if (s->epoll_fd < 0) { | |
279 | r = -errno; | |
f47781d8 | 280 | log_error_errno(errno, "Failed to create epoll object: %m"); |
663996b3 MS |
281 | goto fail; |
282 | } | |
283 | ||
284 | for (i = 0; i < n_sockets; i++) { | |
285 | struct epoll_event ev; | |
286 | Fifo *f; | |
287 | int fd; | |
288 | ||
289 | fd = SD_LISTEN_FDS_START+i; | |
290 | ||
291 | r = sd_is_fifo(fd, NULL); | |
292 | if (r < 0) { | |
f47781d8 | 293 | log_error_errno(r, "Failed to determine file descriptor type: %m"); |
663996b3 MS |
294 | goto fail; |
295 | } | |
296 | ||
297 | if (!r) { | |
298 | log_error("Wrong file descriptor type."); | |
299 | r = -EINVAL; | |
300 | goto fail; | |
301 | } | |
302 | ||
303 | f = new0(Fifo, 1); | |
304 | if (!f) { | |
305 | r = -ENOMEM; | |
f47781d8 | 306 | log_error_errno(errno, "Failed to create fifo object: %m"); |
663996b3 MS |
307 | goto fail; |
308 | } | |
309 | ||
310 | f->fd = -1; | |
311 | ||
312 | zero(ev); | |
313 | ev.events = EPOLLIN; | |
314 | ev.data.ptr = f; | |
315 | if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) { | |
316 | r = -errno; | |
317 | fifo_free(f); | |
f47781d8 | 318 | log_error_errno(errno, "Failed to add fifo fd to epoll object: %m"); |
663996b3 MS |
319 | goto fail; |
320 | } | |
321 | ||
322 | f->fd = fd; | |
60f067b4 | 323 | LIST_PREPEND(fifo, s->fifos, f); |
663996b3 MS |
324 | f->server = s; |
325 | s->n_fifos ++; | |
326 | } | |
327 | ||
60f067b4 JS |
328 | r = bus_open_system_systemd(&s->bus); |
329 | if (r < 0) { | |
f47781d8 | 330 | log_error_errno(r, "Failed to get D-Bus connection: %m"); |
663996b3 MS |
331 | r = -EIO; |
332 | goto fail; | |
333 | } | |
334 | ||
335 | return 0; | |
336 | ||
337 | fail: | |
338 | server_done(s); | |
339 | ||
663996b3 MS |
340 | return r; |
341 | } | |
342 | ||
343 | static int process_event(Server *s, struct epoll_event *ev) { | |
344 | int r; | |
345 | Fifo *f; | |
346 | ||
347 | assert(s); | |
348 | ||
349 | if (!(ev->events & EPOLLIN)) { | |
350 | log_info("Got invalid event from epoll. (3)"); | |
351 | return -EIO; | |
352 | } | |
353 | ||
354 | f = (Fifo*) ev->data.ptr; | |
14228c0d MB |
355 | r = fifo_process(f); |
356 | if (r < 0) { | |
f47781d8 | 357 | log_info_errno(r, "Got error on fifo: %m"); |
663996b3 MS |
358 | fifo_free(f); |
359 | return r; | |
360 | } | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
365 | int main(int argc, char *argv[]) { | |
366 | Server server; | |
367 | int r = EXIT_FAILURE, n; | |
368 | ||
369 | if (getppid() != 1) { | |
370 | log_error("This program should be invoked by init only."); | |
371 | return EXIT_FAILURE; | |
372 | } | |
373 | ||
374 | if (argc > 1) { | |
375 | log_error("This program does not take arguments."); | |
376 | return EXIT_FAILURE; | |
377 | } | |
378 | ||
379 | log_set_target(LOG_TARGET_AUTO); | |
380 | log_parse_environment(); | |
381 | log_open(); | |
382 | ||
383 | umask(0022); | |
384 | ||
60f067b4 JS |
385 | n = sd_listen_fds(true); |
386 | if (n < 0) { | |
f47781d8 | 387 | log_error_errno(r, "Failed to read listening file descriptors from environment: %m"); |
663996b3 MS |
388 | return EXIT_FAILURE; |
389 | } | |
390 | ||
391 | if (n <= 0 || n > SERVER_FD_MAX) { | |
392 | log_error("No or too many file descriptors passed."); | |
393 | return EXIT_FAILURE; | |
394 | } | |
395 | ||
396 | if (server_init(&server, (unsigned) n) < 0) | |
397 | return EXIT_FAILURE; | |
398 | ||
60f067b4 | 399 | log_debug("systemd-initctl running as pid "PID_FMT, getpid()); |
663996b3 MS |
400 | |
401 | sd_notify(false, | |
402 | "READY=1\n" | |
403 | "STATUS=Processing requests..."); | |
404 | ||
405 | while (!server.quit) { | |
406 | struct epoll_event event; | |
407 | int k; | |
408 | ||
409 | if ((k = epoll_wait(server.epoll_fd, | |
410 | &event, 1, | |
411 | TIMEOUT_MSEC)) < 0) { | |
412 | ||
413 | if (errno == EINTR) | |
414 | continue; | |
415 | ||
f47781d8 | 416 | log_error_errno(errno, "epoll_wait() failed: %m"); |
663996b3 MS |
417 | goto fail; |
418 | } | |
419 | ||
420 | if (k <= 0) | |
421 | break; | |
422 | ||
423 | if (process_event(&server, &event) < 0) | |
424 | goto fail; | |
425 | } | |
426 | ||
427 | r = EXIT_SUCCESS; | |
428 | ||
60f067b4 | 429 | log_debug("systemd-initctl stopped as pid "PID_FMT, getpid()); |
663996b3 MS |
430 | |
431 | fail: | |
432 | sd_notify(false, | |
5eef597e | 433 | "STOPPING=1\n" |
663996b3 MS |
434 | "STATUS=Shutting down..."); |
435 | ||
436 | server_done(&server); | |
437 | ||
663996b3 MS |
438 | return r; |
439 | } |