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