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1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
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" | |
42 | ||
43 | #define SERVER_FD_START 3 | |
44 | #define SERVER_FD_MAX 16 | |
45 | #define TIMEOUT ((int) (10*MSEC_PER_SEC)) | |
46 | ||
47 | typedef struct Fifo Fifo; | |
48 | ||
49 | typedef struct Server { | |
50 | int epoll_fd; | |
51 | ||
52 | LIST_HEAD(Fifo, fifos); | |
53 | unsigned n_fifos; | |
54 | ||
55 | DBusConnection *bus; | |
56 | } Server; | |
57 | ||
58 | struct Fifo { | |
59 | Server *server; | |
60 | ||
61 | int fd; | |
62 | ||
63 | struct init_request buffer; | |
64 | size_t bytes_read; | |
65 | ||
66 | LIST_FIELDS(Fifo, fifo); | |
67 | }; | |
68 | ||
69 | static const char *translate_runlevel(int runlevel) { | |
70 | ||
71 | switch (runlevel) { | |
72 | ||
73 | case '0': | |
74 | return "halt.target"; | |
75 | ||
76 | case '1': | |
77 | case 's': | |
78 | case 'S': | |
79 | return "rescue.target"; | |
80 | ||
81 | case '2': | |
82 | return "runlevel2.target"; | |
83 | ||
84 | case '3': | |
85 | return "runlevel3.target"; | |
86 | ||
87 | case '4': | |
88 | return "runlevel4.target"; | |
89 | ||
90 | case '5': | |
91 | return "runlevel5.target"; | |
92 | ||
93 | case '6': | |
94 | return "reboot.target"; | |
95 | ||
96 | default: | |
97 | return NULL; | |
98 | } | |
99 | } | |
100 | ||
101 | static void change_runlevel(Server *s, int runlevel) { | |
102 | const char *target; | |
103 | DBusMessage *m = NULL, *reply = NULL; | |
104 | DBusError error; | |
105 | const char *path, *replace = "replace"; | |
106 | ||
107 | assert(s); | |
108 | ||
109 | dbus_error_init(&error); | |
110 | ||
111 | if (!(target = translate_runlevel(runlevel))) { | |
112 | log_warning("Got request for unknown runlevel %c, ignoring.", runlevel); | |
113 | goto finish; | |
114 | } | |
115 | ||
116 | log_debug("Running request %s", target); | |
117 | ||
118 | if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1", "GetUnit"))) { | |
119 | log_error("Could not allocate message."); | |
120 | goto finish; | |
121 | } | |
122 | ||
123 | if (!dbus_message_append_args(m, | |
124 | DBUS_TYPE_STRING, &target, | |
125 | DBUS_TYPE_INVALID)) { | |
126 | log_error("Could not attach group information to signal message."); | |
127 | goto finish; | |
128 | } | |
129 | ||
130 | if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) { | |
131 | log_error("Failed to get unit path: %s", error.message); | |
132 | goto finish; | |
133 | } | |
134 | ||
135 | if (!dbus_message_get_args(reply, &error, | |
136 | DBUS_TYPE_OBJECT_PATH, &path, | |
137 | DBUS_TYPE_INVALID)) { | |
138 | log_error("Failed to parse unit path: %s", error.message); | |
139 | goto finish; | |
140 | } | |
141 | ||
142 | dbus_message_unref(m); | |
143 | if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", path, "org.freedesktop.systemd1.Unit", "Start"))) { | |
144 | log_error("Could not allocate message."); | |
145 | goto finish; | |
146 | } | |
147 | ||
148 | if (!dbus_message_append_args(m, | |
149 | DBUS_TYPE_STRING, &replace, | |
150 | DBUS_TYPE_INVALID)) { | |
151 | log_error("Could not attach group information to signal message."); | |
152 | goto finish; | |
153 | } | |
154 | ||
155 | dbus_message_unref(reply); | |
156 | if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) { | |
157 | log_error("Failed to start unit: %s", error.message); | |
158 | goto finish; | |
159 | } | |
160 | ||
161 | finish: | |
162 | if (m) | |
163 | dbus_message_unref(m); | |
164 | ||
165 | if (reply) | |
166 | dbus_message_unref(reply); | |
167 | ||
168 | dbus_error_free(&error); | |
169 | } | |
170 | ||
171 | static void request_process(Server *s, const struct init_request *req) { | |
172 | assert(s); | |
173 | assert(req); | |
174 | ||
175 | if (req->magic != INIT_MAGIC) { | |
176 | log_error("Got initctl request with invalid magic. Ignoring."); | |
177 | return; | |
178 | } | |
179 | ||
180 | switch (req->cmd) { | |
181 | ||
182 | case INIT_CMD_RUNLVL: | |
183 | if (!isprint(req->runlevel)) | |
184 | log_error("Got invalid runlevel. Ignoring."); | |
185 | else | |
186 | change_runlevel(s, req->runlevel); | |
187 | return; | |
188 | ||
189 | case INIT_CMD_POWERFAIL: | |
190 | case INIT_CMD_POWERFAILNOW: | |
191 | case INIT_CMD_POWEROK: | |
192 | log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!"); | |
193 | return; | |
194 | ||
195 | case INIT_CMD_CHANGECONS: | |
196 | log_warning("Received console change initctl request. This is not implemented in systemd."); | |
197 | return; | |
198 | ||
199 | case INIT_CMD_SETENV: | |
200 | case INIT_CMD_UNSETENV: | |
201 | log_warning("Received environment initctl request. This is not implemented in systemd."); | |
202 | return; | |
203 | ||
204 | default: | |
205 | log_warning("Received unknown initctl request. Ignoring."); | |
206 | return; | |
207 | } | |
208 | } | |
209 | ||
210 | static int fifo_process(Fifo *f) { | |
211 | ssize_t l; | |
212 | ||
213 | assert(f); | |
214 | ||
215 | errno = EIO; | |
216 | if ((l = read(f->fd, ((uint8_t*) &f->buffer) + f->bytes_read, sizeof(f->buffer) - f->bytes_read)) <= 0) { | |
217 | ||
218 | if (errno == EAGAIN) | |
219 | return 0; | |
220 | ||
221 | log_warning("Failed to read from fifo: %s", strerror(errno)); | |
222 | return -1; | |
223 | } | |
224 | ||
225 | f->bytes_read += l; | |
226 | assert(f->bytes_read <= sizeof(f->buffer)); | |
227 | ||
228 | if (f->bytes_read == sizeof(f->buffer)) { | |
229 | request_process(f->server, &f->buffer); | |
230 | f->bytes_read = 0; | |
231 | } | |
232 | ||
233 | return 0; | |
234 | } | |
235 | ||
236 | static void fifo_free(Fifo *f) { | |
237 | assert(f); | |
238 | ||
239 | if (f->server) { | |
240 | assert(f->server->n_fifos > 0); | |
241 | f->server->n_fifos--; | |
242 | LIST_REMOVE(Fifo, fifo, f->server->fifos, f); | |
243 | } | |
244 | ||
245 | if (f->fd >= 0) { | |
246 | if (f->server) | |
247 | epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL); | |
248 | ||
249 | assert_se(close_nointr(f->fd) == 0); | |
250 | } | |
251 | ||
252 | free(f); | |
253 | } | |
254 | ||
255 | static int verify_environment(unsigned *n_sockets) { | |
256 | unsigned long long pid; | |
257 | const char *e; | |
258 | int r; | |
259 | unsigned ns; | |
260 | ||
261 | assert_se(n_sockets); | |
262 | ||
263 | if (!(e = getenv("LISTEN_PID"))) { | |
264 | log_error("Missing $LISTEN_PID environment variable."); | |
265 | return -ENOENT; | |
266 | } | |
267 | ||
268 | if ((r = safe_atollu(e, &pid)) < 0) { | |
269 | log_error("Failed to parse $LISTEN_PID: %s", strerror(-r)); | |
270 | return r; | |
271 | } | |
272 | ||
273 | if (pid != (unsigned long long) getpid()) { | |
274 | log_error("Socket nor for me."); | |
275 | return -ENOENT; | |
276 | } | |
277 | ||
278 | if (!(e = getenv("LISTEN_FDS"))) { | |
279 | log_error("Missing $LISTEN_FDS environment variable."); | |
280 | return -ENOENT; | |
281 | } | |
282 | ||
283 | if ((r = safe_atou(e, &ns)) < 0) { | |
284 | log_error("Failed to parse $LISTEN_FDS: %s", strerror(-r)); | |
285 | return -E2BIG; | |
286 | } | |
287 | ||
288 | if (ns <= 0 || ns > SERVER_FD_MAX) { | |
289 | log_error("Wrong number of file descriptors passed: %s", e); | |
290 | return -E2BIG; | |
291 | } | |
292 | ||
293 | *n_sockets = ns; | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
298 | static void server_done(Server *s) { | |
299 | assert(s); | |
300 | ||
301 | while (s->fifos) | |
302 | fifo_free(s->fifos); | |
303 | ||
304 | if (s->epoll_fd >= 0) | |
305 | assert_se(close_nointr(s->epoll_fd) == 0); | |
306 | ||
307 | if (s->bus) | |
308 | dbus_connection_unref(s->bus); | |
309 | } | |
310 | ||
311 | static int server_init(Server *s, unsigned n_sockets) { | |
312 | int r; | |
313 | unsigned i; | |
314 | DBusError error; | |
315 | ||
316 | assert(s); | |
317 | assert(n_sockets > 0); | |
318 | ||
319 | dbus_error_init(&error); | |
320 | ||
321 | zero(*s); | |
322 | ||
323 | if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) { | |
324 | r = -errno; | |
325 | log_error("Failed to create epoll object: %s", strerror(errno)); | |
326 | goto fail; | |
327 | } | |
328 | ||
329 | for (i = 0; i < n_sockets; i++) { | |
330 | struct epoll_event ev; | |
331 | Fifo *f; | |
332 | ||
333 | if (!(f = new0(Fifo, 1))) { | |
334 | r = -ENOMEM; | |
335 | log_error("Failed to create fifo object: %s", strerror(errno)); | |
336 | goto fail; | |
337 | } | |
338 | ||
339 | f->fd = -1; | |
340 | ||
341 | zero(ev); | |
342 | ev.events = EPOLLIN; | |
343 | ev.data.ptr = f; | |
344 | if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, SERVER_FD_START+i, &ev) < 0) { | |
345 | r = -errno; | |
346 | fifo_free(f); | |
347 | log_error("Failed to add fifo fd to epoll object: %s", strerror(errno)); | |
348 | goto fail; | |
349 | } | |
350 | ||
351 | f->fd = SERVER_FD_START+i; | |
352 | LIST_PREPEND(Fifo, fifo, s->fifos, f); | |
353 | f->server = s; | |
354 | s->n_fifos ++; | |
355 | } | |
356 | ||
357 | if (!(s->bus = dbus_bus_get(DBUS_BUS_SYSTEM, &error))) { | |
358 | log_error("Failed to get D-Bus connection: %s", error.message); | |
359 | goto fail; | |
360 | } | |
361 | ||
362 | return 0; | |
363 | ||
364 | fail: | |
365 | server_done(s); | |
366 | ||
367 | dbus_error_free(&error); | |
368 | return r; | |
369 | } | |
370 | ||
371 | static int process_event(Server *s, struct epoll_event *ev) { | |
372 | int r; | |
373 | Fifo *f; | |
374 | ||
375 | assert(s); | |
376 | ||
377 | if (!(ev->events & EPOLLIN)) { | |
378 | log_info("Got invalid event from epoll. (3)"); | |
379 | return -EIO; | |
380 | } | |
381 | ||
382 | f = (Fifo*) ev->data.ptr; | |
383 | ||
384 | if ((r = fifo_process(f)) < 0) { | |
385 | log_info("Got error on fifo: %s", strerror(-r)); | |
386 | fifo_free(f); | |
387 | return r; | |
388 | } | |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
393 | int main(int argc, char *argv[]) { | |
394 | Server server; | |
395 | int r = 3; | |
396 | unsigned n; | |
397 | ||
398 | log_info("systemd-initctl running as pid %llu", (unsigned long long) getpid()); | |
399 | ||
400 | if (verify_environment(&n) < 0) | |
401 | return 1; | |
402 | ||
403 | if (server_init(&server, n) < 0) | |
404 | return 2; | |
405 | ||
406 | for (;;) { | |
407 | struct epoll_event event; | |
408 | int k; | |
409 | ||
410 | if ((k = epoll_wait(server.epoll_fd, | |
411 | &event, 1, | |
412 | TIMEOUT)) < 0) { | |
413 | ||
414 | if (errno == EINTR) | |
415 | continue; | |
416 | ||
417 | log_error("epoll_wait() failed: %s", strerror(errno)); | |
418 | goto fail; | |
419 | } | |
420 | ||
421 | if (k <= 0) | |
422 | break; | |
423 | ||
424 | if ((k = process_event(&server, &event)) < 0) | |
425 | goto fail; | |
426 | } | |
427 | r = 0; | |
428 | ||
429 | fail: | |
430 | server_done(&server); | |
431 | ||
432 | log_info("systemd-initctl stopped as pid %llu", (unsigned long long) getpid()); | |
433 | ||
434 | dbus_shutdown(); | |
435 | ||
436 | return r; | |
437 | } |