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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" |
0b7964b8 | 45 | |
0b7964b8 LP |
46 | #define SERVER_FD_MAX 16 |
47 | #define TIMEOUT ((int) (10*MSEC_PER_SEC)) | |
48 | ||
49 | typedef struct Fifo Fifo; | |
50 | ||
51 | typedef struct Server { | |
52 | int epoll_fd; | |
53 | ||
54 | LIST_HEAD(Fifo, fifos); | |
55 | unsigned n_fifos; | |
56 | ||
57 | DBusConnection *bus; | |
58 | } Server; | |
59 | ||
60 | struct Fifo { | |
61 | Server *server; | |
62 | ||
63 | int fd; | |
64 | ||
65 | struct init_request buffer; | |
66 | size_t bytes_read; | |
67 | ||
68 | LIST_FIELDS(Fifo, fifo); | |
69 | }; | |
70 | ||
ac83842a | 71 | static const char *translate_runlevel(int runlevel, bool *isolate) { |
6542952f LP |
72 | static const struct { |
73 | const int runlevel; | |
74 | const char *special; | |
ac83842a | 75 | bool isolate; |
6542952f | 76 | } table[] = { |
ac83842a LP |
77 | { '0', SPECIAL_POWEROFF_TARGET, false }, |
78 | { '1', SPECIAL_RESCUE_TARGET, true }, | |
79 | { 's', SPECIAL_RESCUE_TARGET, true }, | |
80 | { 'S', SPECIAL_RESCUE_TARGET, true }, | |
81 | { '2', SPECIAL_RUNLEVEL2_TARGET, true }, | |
82 | { '3', SPECIAL_RUNLEVEL3_TARGET, true }, | |
83 | { '4', SPECIAL_RUNLEVEL4_TARGET, true }, | |
84 | { '5', SPECIAL_RUNLEVEL5_TARGET, true }, | |
85 | { '6', SPECIAL_REBOOT_TARGET, false }, | |
6542952f LP |
86 | }; |
87 | ||
88 | unsigned i; | |
89 | ||
ac83842a LP |
90 | assert(isolate); |
91 | ||
6542952f | 92 | for (i = 0; i < ELEMENTSOF(table); i++) |
ac83842a LP |
93 | if (table[i].runlevel == runlevel) { |
94 | *isolate = table[i].isolate; | |
6542952f | 95 | return table[i].special; |
ac83842a | 96 | } |
6542952f LP |
97 | |
98 | return NULL; | |
0b7964b8 LP |
99 | } |
100 | ||
101 | static void change_runlevel(Server *s, int runlevel) { | |
102 | const char *target; | |
103 | DBusMessage *m = NULL, *reply = NULL; | |
104 | DBusError error; | |
ac83842a LP |
105 | const char *mode; |
106 | bool isolate = false; | |
0b7964b8 LP |
107 | |
108 | assert(s); | |
109 | ||
110 | dbus_error_init(&error); | |
111 | ||
ac83842a | 112 | if (!(target = translate_runlevel(runlevel, &isolate))) { |
0b7964b8 LP |
113 | log_warning("Got request for unknown runlevel %c, ignoring.", runlevel); |
114 | goto finish; | |
115 | } | |
116 | ||
ac83842a LP |
117 | if (isolate) |
118 | mode = "isolate"; | |
119 | else | |
120 | mode = "replace"; | |
121 | ||
6f0d624e | 122 | log_debug("Running request %s/start/%s", target, mode); |
0b7964b8 | 123 | |
c87eba54 | 124 | if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit"))) { |
0b7964b8 LP |
125 | log_error("Could not allocate message."); |
126 | goto finish; | |
127 | } | |
128 | ||
129 | if (!dbus_message_append_args(m, | |
130 | DBUS_TYPE_STRING, &target, | |
ac83842a | 131 | DBUS_TYPE_STRING, &mode, |
0b7964b8 | 132 | DBUS_TYPE_INVALID)) { |
5192bd19 | 133 | log_error("Could not attach target and flag information to message."); |
0b7964b8 LP |
134 | goto finish; |
135 | } | |
136 | ||
0b7964b8 | 137 | if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) { |
4cf5d675 | 138 | log_error("Failed to start unit: %s", bus_error_message(&error)); |
0b7964b8 LP |
139 | goto finish; |
140 | } | |
141 | ||
142 | finish: | |
143 | if (m) | |
144 | dbus_message_unref(m); | |
145 | ||
146 | if (reply) | |
147 | dbus_message_unref(reply); | |
148 | ||
149 | dbus_error_free(&error); | |
150 | } | |
151 | ||
152 | static void request_process(Server *s, const struct init_request *req) { | |
153 | assert(s); | |
154 | assert(req); | |
155 | ||
156 | if (req->magic != INIT_MAGIC) { | |
157 | log_error("Got initctl request with invalid magic. Ignoring."); | |
158 | return; | |
159 | } | |
160 | ||
161 | switch (req->cmd) { | |
162 | ||
163 | case INIT_CMD_RUNLVL: | |
164 | if (!isprint(req->runlevel)) | |
165 | log_error("Got invalid runlevel. Ignoring."); | |
166 | else | |
167 | change_runlevel(s, req->runlevel); | |
168 | return; | |
169 | ||
170 | case INIT_CMD_POWERFAIL: | |
171 | case INIT_CMD_POWERFAILNOW: | |
172 | case INIT_CMD_POWEROK: | |
173 | log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!"); | |
174 | return; | |
175 | ||
176 | case INIT_CMD_CHANGECONS: | |
177 | log_warning("Received console change initctl request. This is not implemented in systemd."); | |
178 | return; | |
179 | ||
180 | case INIT_CMD_SETENV: | |
181 | case INIT_CMD_UNSETENV: | |
182 | log_warning("Received environment initctl request. This is not implemented in systemd."); | |
183 | return; | |
184 | ||
185 | default: | |
186 | log_warning("Received unknown initctl request. Ignoring."); | |
187 | return; | |
188 | } | |
189 | } | |
190 | ||
191 | static int fifo_process(Fifo *f) { | |
192 | ssize_t l; | |
193 | ||
194 | assert(f); | |
195 | ||
196 | errno = EIO; | |
197 | if ((l = read(f->fd, ((uint8_t*) &f->buffer) + f->bytes_read, sizeof(f->buffer) - f->bytes_read)) <= 0) { | |
198 | ||
199 | if (errno == EAGAIN) | |
200 | return 0; | |
201 | ||
202 | log_warning("Failed to read from fifo: %s", strerror(errno)); | |
203 | return -1; | |
204 | } | |
205 | ||
206 | f->bytes_read += l; | |
207 | assert(f->bytes_read <= sizeof(f->buffer)); | |
208 | ||
209 | if (f->bytes_read == sizeof(f->buffer)) { | |
210 | request_process(f->server, &f->buffer); | |
211 | f->bytes_read = 0; | |
212 | } | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static void fifo_free(Fifo *f) { | |
218 | assert(f); | |
219 | ||
220 | if (f->server) { | |
221 | assert(f->server->n_fifos > 0); | |
222 | f->server->n_fifos--; | |
223 | LIST_REMOVE(Fifo, fifo, f->server->fifos, f); | |
224 | } | |
225 | ||
226 | if (f->fd >= 0) { | |
227 | if (f->server) | |
228 | epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL); | |
229 | ||
a16e1123 | 230 | close_nointr_nofail(f->fd); |
0b7964b8 LP |
231 | } |
232 | ||
233 | free(f); | |
234 | } | |
235 | ||
0b7964b8 LP |
236 | static void server_done(Server *s) { |
237 | assert(s); | |
238 | ||
239 | while (s->fifos) | |
240 | fifo_free(s->fifos); | |
241 | ||
242 | if (s->epoll_fd >= 0) | |
a16e1123 | 243 | close_nointr_nofail(s->epoll_fd); |
0b7964b8 | 244 | |
fb1af5b0 | 245 | if (s->bus) { |
5d452f9c LP |
246 | dbus_connection_flush(s->bus); |
247 | dbus_connection_close(s->bus); | |
248 | dbus_connection_unref(s->bus); | |
fb1af5b0 | 249 | } |
0b7964b8 LP |
250 | } |
251 | ||
252 | static int server_init(Server *s, unsigned n_sockets) { | |
253 | int r; | |
254 | unsigned i; | |
255 | DBusError error; | |
256 | ||
257 | assert(s); | |
258 | assert(n_sockets > 0); | |
259 | ||
260 | dbus_error_init(&error); | |
261 | ||
262 | zero(*s); | |
263 | ||
264 | if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) { | |
265 | r = -errno; | |
266 | log_error("Failed to create epoll object: %s", strerror(errno)); | |
267 | goto fail; | |
268 | } | |
269 | ||
270 | for (i = 0; i < n_sockets; i++) { | |
271 | struct epoll_event ev; | |
272 | Fifo *f; | |
7c394faa LP |
273 | int fd; |
274 | ||
275 | fd = SD_LISTEN_FDS_START+i; | |
276 | ||
277 | if ((r = sd_is_fifo(fd, NULL)) < 0) { | |
278 | log_error("Failed to determine file descriptor type: %s", strerror(-r)); | |
279 | goto fail; | |
280 | } | |
281 | ||
282 | if (!r) { | |
283 | log_error("Wrong file descriptor type."); | |
284 | r = -EINVAL; | |
285 | goto fail; | |
286 | } | |
0b7964b8 LP |
287 | |
288 | if (!(f = new0(Fifo, 1))) { | |
289 | r = -ENOMEM; | |
290 | log_error("Failed to create fifo object: %s", strerror(errno)); | |
291 | goto fail; | |
292 | } | |
293 | ||
294 | f->fd = -1; | |
295 | ||
296 | zero(ev); | |
297 | ev.events = EPOLLIN; | |
298 | ev.data.ptr = f; | |
7c394faa | 299 | if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) { |
0b7964b8 LP |
300 | r = -errno; |
301 | fifo_free(f); | |
302 | log_error("Failed to add fifo fd to epoll object: %s", strerror(errno)); | |
303 | goto fail; | |
304 | } | |
305 | ||
63983207 | 306 | f->fd = fd; |
0b7964b8 LP |
307 | LIST_PREPEND(Fifo, fifo, s->fifos, f); |
308 | f->server = s; | |
309 | s->n_fifos ++; | |
310 | } | |
311 | ||
b574246b | 312 | if (bus_connect(DBUS_BUS_SYSTEM, &s->bus, NULL, &error) < 0) { |
4cf5d675 | 313 | log_error("Failed to get D-Bus connection: %s", bus_error_message(&error)); |
0b7964b8 LP |
314 | goto fail; |
315 | } | |
316 | ||
317 | return 0; | |
318 | ||
319 | fail: | |
320 | server_done(s); | |
321 | ||
322 | dbus_error_free(&error); | |
323 | return r; | |
324 | } | |
325 | ||
326 | static int process_event(Server *s, struct epoll_event *ev) { | |
327 | int r; | |
328 | Fifo *f; | |
329 | ||
330 | assert(s); | |
331 | ||
332 | if (!(ev->events & EPOLLIN)) { | |
333 | log_info("Got invalid event from epoll. (3)"); | |
334 | return -EIO; | |
335 | } | |
336 | ||
337 | f = (Fifo*) ev->data.ptr; | |
338 | ||
339 | if ((r = fifo_process(f)) < 0) { | |
340 | log_info("Got error on fifo: %s", strerror(-r)); | |
341 | fifo_free(f); | |
342 | return r; | |
343 | } | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
348 | int main(int argc, char *argv[]) { | |
349 | Server server; | |
22f4096c | 350 | int r = EXIT_FAILURE, n; |
8bfcc8ea | 351 | |
0ca3f374 LP |
352 | if (getppid() != 1) { |
353 | log_error("This program should be invoked by init only."); | |
22f4096c | 354 | return EXIT_FAILURE; |
0ca3f374 LP |
355 | } |
356 | ||
357 | if (argc > 1) { | |
358 | log_error("This program does not take arguments."); | |
22f4096c | 359 | return EXIT_FAILURE; |
0ca3f374 LP |
360 | } |
361 | ||
8bfcc8ea LP |
362 | log_set_target(LOG_TARGET_SYSLOG_OR_KMSG); |
363 | log_parse_environment(); | |
2396fb04 | 364 | log_open(); |
0b7964b8 | 365 | |
8bfcc8ea LP |
366 | if ((n = sd_listen_fds(true)) < 0) { |
367 | log_error("Failed to read listening file descriptors from environment: %s", strerror(-r)); | |
22f4096c | 368 | return EXIT_FAILURE; |
8bfcc8ea LP |
369 | } |
370 | ||
371 | if (n <= 0 || n > SERVER_FD_MAX) { | |
372 | log_error("No or too many file descriptors passed."); | |
22f4096c | 373 | return EXIT_FAILURE; |
8bfcc8ea | 374 | } |
0b7964b8 | 375 | |
8bfcc8ea | 376 | if (server_init(&server, (unsigned) n) < 0) |
22f4096c | 377 | return EXIT_FAILURE; |
0b7964b8 | 378 | |
cd6d0a45 LP |
379 | log_debug("systemd-initctl running as pid %lu", (unsigned long) getpid()); |
380 | ||
8c47c732 LP |
381 | sd_notify(false, |
382 | "READY=1\n" | |
383 | "STATUS=Processing requests..."); | |
384 | ||
0b7964b8 LP |
385 | for (;;) { |
386 | struct epoll_event event; | |
387 | int k; | |
388 | ||
389 | if ((k = epoll_wait(server.epoll_fd, | |
390 | &event, 1, | |
391 | TIMEOUT)) < 0) { | |
392 | ||
393 | if (errno == EINTR) | |
394 | continue; | |
395 | ||
396 | log_error("epoll_wait() failed: %s", strerror(errno)); | |
397 | goto fail; | |
398 | } | |
399 | ||
400 | if (k <= 0) | |
401 | break; | |
402 | ||
e364ad06 | 403 | if (process_event(&server, &event) < 0) |
0b7964b8 LP |
404 | goto fail; |
405 | } | |
cd6d0a45 | 406 | |
22f4096c | 407 | r = EXIT_SUCCESS; |
0b7964b8 | 408 | |
cd6d0a45 LP |
409 | log_debug("systemd-initctl stopped as pid %lu", (unsigned long) getpid()); |
410 | ||
0b7964b8 | 411 | fail: |
8c47c732 LP |
412 | sd_notify(false, |
413 | "STATUS=Shutting down..."); | |
414 | ||
0b7964b8 LP |
415 | server_done(&server); |
416 | ||
0b7964b8 LP |
417 | dbus_shutdown(); |
418 | ||
419 | return r; | |
420 | } |