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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 | ||
71 | static const char *translate_runlevel(int runlevel) { | |
6542952f LP |
72 | static const struct { |
73 | const int runlevel; | |
74 | const char *special; | |
75 | } table[] = { | |
514f4ef5 LP |
76 | { '0', SPECIAL_POWEROFF_TARGET }, |
77 | { '1', SPECIAL_RESCUE_TARGET }, | |
78 | { 's', SPECIAL_RESCUE_TARGET }, | |
79 | { 'S', SPECIAL_RESCUE_TARGET }, | |
6542952f LP |
80 | { '2', SPECIAL_RUNLEVEL2_TARGET }, |
81 | { '3', SPECIAL_RUNLEVEL3_TARGET }, | |
82 | { '4', SPECIAL_RUNLEVEL4_TARGET }, | |
83 | { '5', SPECIAL_RUNLEVEL5_TARGET }, | |
514f4ef5 | 84 | { '6', SPECIAL_REBOOT_TARGET }, |
6542952f LP |
85 | }; |
86 | ||
87 | unsigned i; | |
88 | ||
89 | for (i = 0; i < ELEMENTSOF(table); i++) | |
90 | if (table[i].runlevel == runlevel) | |
91 | return table[i].special; | |
92 | ||
93 | return NULL; | |
0b7964b8 LP |
94 | } |
95 | ||
96 | static void change_runlevel(Server *s, int runlevel) { | |
97 | const char *target; | |
98 | DBusMessage *m = NULL, *reply = NULL; | |
99 | DBusError error; | |
c87eba54 | 100 | const char *replace = "replace"; |
0b7964b8 LP |
101 | |
102 | assert(s); | |
103 | ||
104 | dbus_error_init(&error); | |
105 | ||
106 | if (!(target = translate_runlevel(runlevel))) { | |
107 | log_warning("Got request for unknown runlevel %c, ignoring.", runlevel); | |
108 | goto finish; | |
109 | } | |
110 | ||
111 | log_debug("Running request %s", target); | |
112 | ||
c87eba54 | 113 | if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit"))) { |
0b7964b8 LP |
114 | log_error("Could not allocate message."); |
115 | goto finish; | |
116 | } | |
117 | ||
118 | if (!dbus_message_append_args(m, | |
119 | DBUS_TYPE_STRING, &target, | |
0b7964b8 LP |
120 | DBUS_TYPE_STRING, &replace, |
121 | DBUS_TYPE_INVALID)) { | |
5192bd19 | 122 | log_error("Could not attach target and flag information to message."); |
0b7964b8 LP |
123 | goto finish; |
124 | } | |
125 | ||
0b7964b8 | 126 | if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) { |
4cf5d675 | 127 | log_error("Failed to start unit: %s", bus_error_message(&error)); |
0b7964b8 LP |
128 | goto finish; |
129 | } | |
130 | ||
131 | finish: | |
132 | if (m) | |
133 | dbus_message_unref(m); | |
134 | ||
135 | if (reply) | |
136 | dbus_message_unref(reply); | |
137 | ||
138 | dbus_error_free(&error); | |
139 | } | |
140 | ||
141 | static void request_process(Server *s, const struct init_request *req) { | |
142 | assert(s); | |
143 | assert(req); | |
144 | ||
145 | if (req->magic != INIT_MAGIC) { | |
146 | log_error("Got initctl request with invalid magic. Ignoring."); | |
147 | return; | |
148 | } | |
149 | ||
150 | switch (req->cmd) { | |
151 | ||
152 | case INIT_CMD_RUNLVL: | |
153 | if (!isprint(req->runlevel)) | |
154 | log_error("Got invalid runlevel. Ignoring."); | |
155 | else | |
156 | change_runlevel(s, req->runlevel); | |
157 | return; | |
158 | ||
159 | case INIT_CMD_POWERFAIL: | |
160 | case INIT_CMD_POWERFAILNOW: | |
161 | case INIT_CMD_POWEROK: | |
162 | log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!"); | |
163 | return; | |
164 | ||
165 | case INIT_CMD_CHANGECONS: | |
166 | log_warning("Received console change initctl request. This is not implemented in systemd."); | |
167 | return; | |
168 | ||
169 | case INIT_CMD_SETENV: | |
170 | case INIT_CMD_UNSETENV: | |
171 | log_warning("Received environment initctl request. This is not implemented in systemd."); | |
172 | return; | |
173 | ||
174 | default: | |
175 | log_warning("Received unknown initctl request. Ignoring."); | |
176 | return; | |
177 | } | |
178 | } | |
179 | ||
180 | static int fifo_process(Fifo *f) { | |
181 | ssize_t l; | |
182 | ||
183 | assert(f); | |
184 | ||
185 | errno = EIO; | |
186 | if ((l = read(f->fd, ((uint8_t*) &f->buffer) + f->bytes_read, sizeof(f->buffer) - f->bytes_read)) <= 0) { | |
187 | ||
188 | if (errno == EAGAIN) | |
189 | return 0; | |
190 | ||
191 | log_warning("Failed to read from fifo: %s", strerror(errno)); | |
192 | return -1; | |
193 | } | |
194 | ||
195 | f->bytes_read += l; | |
196 | assert(f->bytes_read <= sizeof(f->buffer)); | |
197 | ||
198 | if (f->bytes_read == sizeof(f->buffer)) { | |
199 | request_process(f->server, &f->buffer); | |
200 | f->bytes_read = 0; | |
201 | } | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | static void fifo_free(Fifo *f) { | |
207 | assert(f); | |
208 | ||
209 | if (f->server) { | |
210 | assert(f->server->n_fifos > 0); | |
211 | f->server->n_fifos--; | |
212 | LIST_REMOVE(Fifo, fifo, f->server->fifos, f); | |
213 | } | |
214 | ||
215 | if (f->fd >= 0) { | |
216 | if (f->server) | |
217 | epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL); | |
218 | ||
a16e1123 | 219 | close_nointr_nofail(f->fd); |
0b7964b8 LP |
220 | } |
221 | ||
222 | free(f); | |
223 | } | |
224 | ||
0b7964b8 LP |
225 | static void server_done(Server *s) { |
226 | assert(s); | |
227 | ||
228 | while (s->fifos) | |
229 | fifo_free(s->fifos); | |
230 | ||
231 | if (s->epoll_fd >= 0) | |
a16e1123 | 232 | close_nointr_nofail(s->epoll_fd); |
0b7964b8 | 233 | |
fb1af5b0 | 234 | if (s->bus) { |
5d452f9c LP |
235 | dbus_connection_flush(s->bus); |
236 | dbus_connection_close(s->bus); | |
237 | dbus_connection_unref(s->bus); | |
fb1af5b0 | 238 | } |
0b7964b8 LP |
239 | } |
240 | ||
241 | static int server_init(Server *s, unsigned n_sockets) { | |
242 | int r; | |
243 | unsigned i; | |
244 | DBusError error; | |
245 | ||
246 | assert(s); | |
247 | assert(n_sockets > 0); | |
248 | ||
249 | dbus_error_init(&error); | |
250 | ||
251 | zero(*s); | |
252 | ||
253 | if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) { | |
254 | r = -errno; | |
255 | log_error("Failed to create epoll object: %s", strerror(errno)); | |
256 | goto fail; | |
257 | } | |
258 | ||
259 | for (i = 0; i < n_sockets; i++) { | |
260 | struct epoll_event ev; | |
261 | Fifo *f; | |
7c394faa LP |
262 | int fd; |
263 | ||
264 | fd = SD_LISTEN_FDS_START+i; | |
265 | ||
266 | if ((r = sd_is_fifo(fd, NULL)) < 0) { | |
267 | log_error("Failed to determine file descriptor type: %s", strerror(-r)); | |
268 | goto fail; | |
269 | } | |
270 | ||
271 | if (!r) { | |
272 | log_error("Wrong file descriptor type."); | |
273 | r = -EINVAL; | |
274 | goto fail; | |
275 | } | |
0b7964b8 LP |
276 | |
277 | if (!(f = new0(Fifo, 1))) { | |
278 | r = -ENOMEM; | |
279 | log_error("Failed to create fifo object: %s", strerror(errno)); | |
280 | goto fail; | |
281 | } | |
282 | ||
283 | f->fd = -1; | |
284 | ||
285 | zero(ev); | |
286 | ev.events = EPOLLIN; | |
287 | ev.data.ptr = f; | |
7c394faa | 288 | if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) { |
0b7964b8 LP |
289 | r = -errno; |
290 | fifo_free(f); | |
291 | log_error("Failed to add fifo fd to epoll object: %s", strerror(errno)); | |
292 | goto fail; | |
293 | } | |
294 | ||
63983207 | 295 | f->fd = fd; |
0b7964b8 LP |
296 | LIST_PREPEND(Fifo, fifo, s->fifos, f); |
297 | f->server = s; | |
298 | s->n_fifos ++; | |
299 | } | |
300 | ||
b574246b | 301 | if (bus_connect(DBUS_BUS_SYSTEM, &s->bus, NULL, &error) < 0) { |
4cf5d675 | 302 | log_error("Failed to get D-Bus connection: %s", bus_error_message(&error)); |
0b7964b8 LP |
303 | goto fail; |
304 | } | |
305 | ||
306 | return 0; | |
307 | ||
308 | fail: | |
309 | server_done(s); | |
310 | ||
311 | dbus_error_free(&error); | |
312 | return r; | |
313 | } | |
314 | ||
315 | static int process_event(Server *s, struct epoll_event *ev) { | |
316 | int r; | |
317 | Fifo *f; | |
318 | ||
319 | assert(s); | |
320 | ||
321 | if (!(ev->events & EPOLLIN)) { | |
322 | log_info("Got invalid event from epoll. (3)"); | |
323 | return -EIO; | |
324 | } | |
325 | ||
326 | f = (Fifo*) ev->data.ptr; | |
327 | ||
328 | if ((r = fifo_process(f)) < 0) { | |
329 | log_info("Got error on fifo: %s", strerror(-r)); | |
330 | fifo_free(f); | |
331 | return r; | |
332 | } | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | int main(int argc, char *argv[]) { | |
338 | Server server; | |
22f4096c | 339 | int r = EXIT_FAILURE, n; |
8bfcc8ea | 340 | |
0ca3f374 LP |
341 | if (getppid() != 1) { |
342 | log_error("This program should be invoked by init only."); | |
22f4096c | 343 | return EXIT_FAILURE; |
0ca3f374 LP |
344 | } |
345 | ||
346 | if (argc > 1) { | |
347 | log_error("This program does not take arguments."); | |
22f4096c | 348 | return EXIT_FAILURE; |
0ca3f374 LP |
349 | } |
350 | ||
8bfcc8ea LP |
351 | log_set_target(LOG_TARGET_SYSLOG_OR_KMSG); |
352 | log_parse_environment(); | |
2396fb04 | 353 | log_open(); |
0b7964b8 | 354 | |
8bfcc8ea LP |
355 | if ((n = sd_listen_fds(true)) < 0) { |
356 | log_error("Failed to read listening file descriptors from environment: %s", strerror(-r)); | |
22f4096c | 357 | return EXIT_FAILURE; |
8bfcc8ea LP |
358 | } |
359 | ||
360 | if (n <= 0 || n > SERVER_FD_MAX) { | |
361 | log_error("No or too many file descriptors passed."); | |
22f4096c | 362 | return EXIT_FAILURE; |
8bfcc8ea | 363 | } |
0b7964b8 | 364 | |
8bfcc8ea | 365 | if (server_init(&server, (unsigned) n) < 0) |
22f4096c | 366 | return EXIT_FAILURE; |
0b7964b8 | 367 | |
cd6d0a45 LP |
368 | log_debug("systemd-initctl running as pid %lu", (unsigned long) getpid()); |
369 | ||
8c47c732 LP |
370 | sd_notify(false, |
371 | "READY=1\n" | |
372 | "STATUS=Processing requests..."); | |
373 | ||
0b7964b8 LP |
374 | for (;;) { |
375 | struct epoll_event event; | |
376 | int k; | |
377 | ||
378 | if ((k = epoll_wait(server.epoll_fd, | |
379 | &event, 1, | |
380 | TIMEOUT)) < 0) { | |
381 | ||
382 | if (errno == EINTR) | |
383 | continue; | |
384 | ||
385 | log_error("epoll_wait() failed: %s", strerror(errno)); | |
386 | goto fail; | |
387 | } | |
388 | ||
389 | if (k <= 0) | |
390 | break; | |
391 | ||
e364ad06 | 392 | if (process_event(&server, &event) < 0) |
0b7964b8 LP |
393 | goto fail; |
394 | } | |
cd6d0a45 | 395 | |
22f4096c | 396 | r = EXIT_SUCCESS; |
0b7964b8 | 397 | |
cd6d0a45 LP |
398 | log_debug("systemd-initctl stopped as pid %lu", (unsigned long) getpid()); |
399 | ||
0b7964b8 | 400 | fail: |
8c47c732 LP |
401 | sd_notify(false, |
402 | "STATUS=Shutting down..."); | |
403 | ||
0b7964b8 LP |
404 | server_done(&server); |
405 | ||
0b7964b8 LP |
406 | dbus_shutdown(); |
407 | ||
408 | return r; | |
409 | } |