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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
0b7964b8 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 <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 | ||
36 | #include <dbus/dbus.h> | |
81527be1 | 37 | #include <systemd/sd-daemon.h> |
0b7964b8 LP |
38 | |
39 | #include "util.h" | |
40 | #include "log.h" | |
41 | #include "list.h" | |
42 | #include "initreq.h" | |
514f4ef5 | 43 | #include "special.h" |
a822056b | 44 | #include "dbus-common.h" |
ef9eb0a8 | 45 | #include "def.h" |
0b7964b8 | 46 | |
0b7964b8 | 47 | #define SERVER_FD_MAX 16 |
ef9eb0a8 | 48 | #define TIMEOUT_MSEC ((int) (DEFAULT_EXIT_USEC/USEC_PER_MSEC)) |
0b7964b8 LP |
49 | |
50 | typedef struct Fifo Fifo; | |
51 | ||
52 | typedef struct Server { | |
53 | int epoll_fd; | |
54 | ||
55 | LIST_HEAD(Fifo, fifos); | |
56 | unsigned n_fifos; | |
57 | ||
58 | DBusConnection *bus; | |
f632a663 LP |
59 | |
60 | bool quit; | |
0b7964b8 LP |
61 | } Server; |
62 | ||
63 | struct Fifo { | |
64 | Server *server; | |
65 | ||
66 | int fd; | |
67 | ||
68 | struct init_request buffer; | |
69 | size_t bytes_read; | |
70 | ||
71 | LIST_FIELDS(Fifo, fifo); | |
72 | }; | |
73 | ||
ac83842a | 74 | static const char *translate_runlevel(int runlevel, bool *isolate) { |
6542952f LP |
75 | static const struct { |
76 | const int runlevel; | |
77 | const char *special; | |
ac83842a | 78 | bool isolate; |
6542952f | 79 | } table[] = { |
ac83842a LP |
80 | { '0', SPECIAL_POWEROFF_TARGET, false }, |
81 | { '1', SPECIAL_RESCUE_TARGET, true }, | |
82 | { 's', SPECIAL_RESCUE_TARGET, true }, | |
83 | { 'S', SPECIAL_RESCUE_TARGET, true }, | |
84 | { '2', SPECIAL_RUNLEVEL2_TARGET, true }, | |
85 | { '3', SPECIAL_RUNLEVEL3_TARGET, true }, | |
86 | { '4', SPECIAL_RUNLEVEL4_TARGET, true }, | |
87 | { '5', SPECIAL_RUNLEVEL5_TARGET, true }, | |
88 | { '6', SPECIAL_REBOOT_TARGET, false }, | |
6542952f LP |
89 | }; |
90 | ||
91 | unsigned i; | |
92 | ||
ac83842a LP |
93 | assert(isolate); |
94 | ||
6542952f | 95 | for (i = 0; i < ELEMENTSOF(table); i++) |
ac83842a LP |
96 | if (table[i].runlevel == runlevel) { |
97 | *isolate = table[i].isolate; | |
65457142 FC |
98 | if (runlevel == '6' && kexec_loaded()) |
99 | return SPECIAL_KEXEC_TARGET; | |
6542952f | 100 | return table[i].special; |
ac83842a | 101 | } |
6542952f LP |
102 | |
103 | return NULL; | |
0b7964b8 LP |
104 | } |
105 | ||
106 | static void change_runlevel(Server *s, int runlevel) { | |
107 | const char *target; | |
108 | DBusMessage *m = NULL, *reply = NULL; | |
109 | DBusError error; | |
ac83842a LP |
110 | const char *mode; |
111 | bool isolate = false; | |
0b7964b8 LP |
112 | |
113 | assert(s); | |
114 | ||
115 | dbus_error_init(&error); | |
116 | ||
ac83842a | 117 | if (!(target = translate_runlevel(runlevel, &isolate))) { |
0b7964b8 LP |
118 | log_warning("Got request for unknown runlevel %c, ignoring.", runlevel); |
119 | goto finish; | |
120 | } | |
121 | ||
ac83842a LP |
122 | if (isolate) |
123 | mode = "isolate"; | |
124 | else | |
125 | mode = "replace"; | |
126 | ||
6f0d624e | 127 | log_debug("Running request %s/start/%s", target, mode); |
0b7964b8 | 128 | |
c87eba54 | 129 | if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit"))) { |
0b7964b8 LP |
130 | log_error("Could not allocate message."); |
131 | goto finish; | |
132 | } | |
133 | ||
134 | if (!dbus_message_append_args(m, | |
135 | DBUS_TYPE_STRING, &target, | |
ac83842a | 136 | DBUS_TYPE_STRING, &mode, |
0b7964b8 | 137 | DBUS_TYPE_INVALID)) { |
5192bd19 | 138 | log_error("Could not attach target and flag information to message."); |
0b7964b8 LP |
139 | goto finish; |
140 | } | |
141 | ||
0b7964b8 | 142 | if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) { |
4cf5d675 | 143 | log_error("Failed to start unit: %s", bus_error_message(&error)); |
0b7964b8 LP |
144 | goto finish; |
145 | } | |
146 | ||
147 | finish: | |
148 | if (m) | |
149 | dbus_message_unref(m); | |
150 | ||
151 | if (reply) | |
152 | dbus_message_unref(reply); | |
153 | ||
154 | dbus_error_free(&error); | |
155 | } | |
156 | ||
157 | static void request_process(Server *s, const struct init_request *req) { | |
158 | assert(s); | |
159 | assert(req); | |
160 | ||
161 | if (req->magic != INIT_MAGIC) { | |
162 | log_error("Got initctl request with invalid magic. Ignoring."); | |
163 | return; | |
164 | } | |
165 | ||
166 | switch (req->cmd) { | |
167 | ||
168 | case INIT_CMD_RUNLVL: | |
169 | if (!isprint(req->runlevel)) | |
170 | log_error("Got invalid runlevel. Ignoring."); | |
171 | else | |
46e964c5 TG |
172 | switch (req->runlevel) { |
173 | ||
174 | /* we are async anyway, so just use kill for reexec/reload */ | |
175 | case 'u': | |
176 | case 'U': | |
177 | if (kill(1, SIGTERM) < 0) | |
178 | log_error("kill() failed: %m"); | |
f632a663 LP |
179 | |
180 | /* The bus connection will be | |
181 | * terminated if PID 1 is reexecuted, | |
182 | * hence let's just exit here, and | |
183 | * rely on that we'll be restarted on | |
184 | * the next request */ | |
185 | s->quit = true; | |
46e964c5 TG |
186 | break; |
187 | ||
188 | case 'q': | |
189 | case 'Q': | |
190 | if (kill(1, SIGHUP) < 0) | |
191 | log_error("kill() failed: %m"); | |
192 | break; | |
193 | ||
194 | default: | |
195 | change_runlevel(s, req->runlevel); | |
196 | } | |
0b7964b8 LP |
197 | return; |
198 | ||
199 | case INIT_CMD_POWERFAIL: | |
200 | case INIT_CMD_POWERFAILNOW: | |
201 | case INIT_CMD_POWEROK: | |
202 | log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!"); | |
203 | return; | |
204 | ||
205 | case INIT_CMD_CHANGECONS: | |
206 | log_warning("Received console change initctl request. This is not implemented in systemd."); | |
207 | return; | |
208 | ||
209 | case INIT_CMD_SETENV: | |
210 | case INIT_CMD_UNSETENV: | |
211 | log_warning("Received environment initctl request. This is not implemented in systemd."); | |
212 | return; | |
213 | ||
214 | default: | |
215 | log_warning("Received unknown initctl request. Ignoring."); | |
216 | return; | |
217 | } | |
218 | } | |
219 | ||
220 | static int fifo_process(Fifo *f) { | |
221 | ssize_t l; | |
222 | ||
223 | assert(f); | |
224 | ||
225 | errno = EIO; | |
226 | if ((l = read(f->fd, ((uint8_t*) &f->buffer) + f->bytes_read, sizeof(f->buffer) - f->bytes_read)) <= 0) { | |
227 | ||
228 | if (errno == EAGAIN) | |
229 | return 0; | |
230 | ||
231 | log_warning("Failed to read from fifo: %s", strerror(errno)); | |
232 | return -1; | |
233 | } | |
234 | ||
235 | f->bytes_read += l; | |
236 | assert(f->bytes_read <= sizeof(f->buffer)); | |
237 | ||
238 | if (f->bytes_read == sizeof(f->buffer)) { | |
239 | request_process(f->server, &f->buffer); | |
240 | f->bytes_read = 0; | |
241 | } | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
246 | static void fifo_free(Fifo *f) { | |
247 | assert(f); | |
248 | ||
249 | if (f->server) { | |
250 | assert(f->server->n_fifos > 0); | |
251 | f->server->n_fifos--; | |
252 | LIST_REMOVE(Fifo, fifo, f->server->fifos, f); | |
253 | } | |
254 | ||
255 | if (f->fd >= 0) { | |
256 | if (f->server) | |
257 | epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL); | |
258 | ||
a16e1123 | 259 | close_nointr_nofail(f->fd); |
0b7964b8 LP |
260 | } |
261 | ||
262 | free(f); | |
263 | } | |
264 | ||
0b7964b8 LP |
265 | static void server_done(Server *s) { |
266 | assert(s); | |
267 | ||
268 | while (s->fifos) | |
269 | fifo_free(s->fifos); | |
270 | ||
271 | if (s->epoll_fd >= 0) | |
a16e1123 | 272 | close_nointr_nofail(s->epoll_fd); |
0b7964b8 | 273 | |
fb1af5b0 | 274 | if (s->bus) { |
5d452f9c LP |
275 | dbus_connection_flush(s->bus); |
276 | dbus_connection_close(s->bus); | |
277 | dbus_connection_unref(s->bus); | |
fb1af5b0 | 278 | } |
0b7964b8 LP |
279 | } |
280 | ||
281 | static int server_init(Server *s, unsigned n_sockets) { | |
282 | int r; | |
283 | unsigned i; | |
284 | DBusError error; | |
285 | ||
286 | assert(s); | |
287 | assert(n_sockets > 0); | |
288 | ||
289 | dbus_error_init(&error); | |
290 | ||
291 | zero(*s); | |
292 | ||
293 | if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) { | |
294 | r = -errno; | |
295 | log_error("Failed to create epoll object: %s", strerror(errno)); | |
296 | goto fail; | |
297 | } | |
298 | ||
299 | for (i = 0; i < n_sockets; i++) { | |
300 | struct epoll_event ev; | |
301 | Fifo *f; | |
7c394faa LP |
302 | int fd; |
303 | ||
304 | fd = SD_LISTEN_FDS_START+i; | |
305 | ||
306 | if ((r = sd_is_fifo(fd, NULL)) < 0) { | |
307 | log_error("Failed to determine file descriptor type: %s", strerror(-r)); | |
308 | goto fail; | |
309 | } | |
310 | ||
311 | if (!r) { | |
312 | log_error("Wrong file descriptor type."); | |
313 | r = -EINVAL; | |
314 | goto fail; | |
315 | } | |
0b7964b8 LP |
316 | |
317 | if (!(f = new0(Fifo, 1))) { | |
318 | r = -ENOMEM; | |
319 | log_error("Failed to create fifo object: %s", strerror(errno)); | |
320 | goto fail; | |
321 | } | |
322 | ||
323 | f->fd = -1; | |
324 | ||
325 | zero(ev); | |
326 | ev.events = EPOLLIN; | |
327 | ev.data.ptr = f; | |
7c394faa | 328 | if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) { |
0b7964b8 LP |
329 | r = -errno; |
330 | fifo_free(f); | |
331 | log_error("Failed to add fifo fd to epoll object: %s", strerror(errno)); | |
332 | goto fail; | |
333 | } | |
334 | ||
63983207 | 335 | f->fd = fd; |
0b7964b8 LP |
336 | LIST_PREPEND(Fifo, fifo, s->fifos, f); |
337 | f->server = s; | |
338 | s->n_fifos ++; | |
339 | } | |
340 | ||
b574246b | 341 | if (bus_connect(DBUS_BUS_SYSTEM, &s->bus, NULL, &error) < 0) { |
4cf5d675 | 342 | log_error("Failed to get D-Bus connection: %s", bus_error_message(&error)); |
0b7964b8 LP |
343 | goto fail; |
344 | } | |
345 | ||
346 | return 0; | |
347 | ||
348 | fail: | |
349 | server_done(s); | |
350 | ||
351 | dbus_error_free(&error); | |
352 | return r; | |
353 | } | |
354 | ||
355 | static int process_event(Server *s, struct epoll_event *ev) { | |
356 | int r; | |
357 | Fifo *f; | |
358 | ||
359 | assert(s); | |
360 | ||
361 | if (!(ev->events & EPOLLIN)) { | |
362 | log_info("Got invalid event from epoll. (3)"); | |
363 | return -EIO; | |
364 | } | |
365 | ||
366 | f = (Fifo*) ev->data.ptr; | |
367 | ||
368 | if ((r = fifo_process(f)) < 0) { | |
369 | log_info("Got error on fifo: %s", strerror(-r)); | |
370 | fifo_free(f); | |
371 | return r; | |
372 | } | |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
377 | int main(int argc, char *argv[]) { | |
378 | Server server; | |
22f4096c | 379 | int r = EXIT_FAILURE, n; |
8bfcc8ea | 380 | |
0ca3f374 LP |
381 | if (getppid() != 1) { |
382 | log_error("This program should be invoked by init only."); | |
22f4096c | 383 | return EXIT_FAILURE; |
0ca3f374 LP |
384 | } |
385 | ||
386 | if (argc > 1) { | |
387 | log_error("This program does not take arguments."); | |
22f4096c | 388 | return EXIT_FAILURE; |
0ca3f374 LP |
389 | } |
390 | ||
4cfa2c99 | 391 | log_set_target(LOG_TARGET_AUTO); |
8bfcc8ea | 392 | log_parse_environment(); |
2396fb04 | 393 | log_open(); |
0b7964b8 | 394 | |
4c12626c LP |
395 | umask(0022); |
396 | ||
8bfcc8ea LP |
397 | if ((n = sd_listen_fds(true)) < 0) { |
398 | log_error("Failed to read listening file descriptors from environment: %s", strerror(-r)); | |
22f4096c | 399 | return EXIT_FAILURE; |
8bfcc8ea LP |
400 | } |
401 | ||
402 | if (n <= 0 || n > SERVER_FD_MAX) { | |
403 | log_error("No or too many file descriptors passed."); | |
22f4096c | 404 | return EXIT_FAILURE; |
8bfcc8ea | 405 | } |
0b7964b8 | 406 | |
8bfcc8ea | 407 | if (server_init(&server, (unsigned) n) < 0) |
22f4096c | 408 | return EXIT_FAILURE; |
0b7964b8 | 409 | |
cd6d0a45 LP |
410 | log_debug("systemd-initctl running as pid %lu", (unsigned long) getpid()); |
411 | ||
8c47c732 LP |
412 | sd_notify(false, |
413 | "READY=1\n" | |
414 | "STATUS=Processing requests..."); | |
415 | ||
f632a663 | 416 | while (!server.quit) { |
0b7964b8 LP |
417 | struct epoll_event event; |
418 | int k; | |
419 | ||
420 | if ((k = epoll_wait(server.epoll_fd, | |
421 | &event, 1, | |
ef9eb0a8 | 422 | TIMEOUT_MSEC)) < 0) { |
0b7964b8 LP |
423 | |
424 | if (errno == EINTR) | |
425 | continue; | |
426 | ||
427 | log_error("epoll_wait() failed: %s", strerror(errno)); | |
428 | goto fail; | |
429 | } | |
430 | ||
431 | if (k <= 0) | |
432 | break; | |
433 | ||
e364ad06 | 434 | if (process_event(&server, &event) < 0) |
0b7964b8 LP |
435 | goto fail; |
436 | } | |
cd6d0a45 | 437 | |
22f4096c | 438 | r = EXIT_SUCCESS; |
0b7964b8 | 439 | |
cd6d0a45 LP |
440 | log_debug("systemd-initctl stopped as pid %lu", (unsigned long) getpid()); |
441 | ||
0b7964b8 | 442 | fail: |
8c47c732 LP |
443 | sd_notify(false, |
444 | "STATUS=Shutting down..."); | |
445 | ||
0b7964b8 LP |
446 | server_done(&server); |
447 | ||
0b7964b8 LP |
448 | dbus_shutdown(); |
449 | ||
450 | return r; | |
451 | } |