1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
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.
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.
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/>.
22 #include <sys/socket.h>
23 #include <sys/types.h>
31 #include <sys/epoll.h>
36 #include <dbus/dbus.h>
37 #include <systemd/sd-daemon.h>
44 #include "dbus-common.h"
47 #define SERVER_FD_MAX 16
48 #define TIMEOUT_MSEC ((int) (DEFAULT_EXIT_USEC/USEC_PER_MSEC))
50 typedef struct Fifo Fifo
;
52 typedef struct Server
{
55 LIST_HEAD(Fifo
, fifos
);
68 struct init_request buffer
;
71 LIST_FIELDS(Fifo
, fifo
);
74 static const char *translate_runlevel(int runlevel
, bool *isolate
) {
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 },
95 for (i
= 0; i
< ELEMENTSOF(table
); i
++)
96 if (table
[i
].runlevel
== runlevel
) {
97 *isolate
= table
[i
].isolate
;
98 if (runlevel
== '6' && kexec_loaded())
99 return SPECIAL_KEXEC_TARGET
;
100 return table
[i
].special
;
106 static void change_runlevel(Server
*s
, int runlevel
) {
108 DBusMessage
*m
= NULL
, *reply
= NULL
;
111 bool isolate
= false;
115 dbus_error_init(&error
);
117 if (!(target
= translate_runlevel(runlevel
, &isolate
))) {
118 log_warning("Got request for unknown runlevel %c, ignoring.", runlevel
);
127 log_debug("Running request %s/start/%s", target
, mode
);
129 if (!(m
= dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit"))) {
130 log_error("Could not allocate message.");
134 if (!dbus_message_append_args(m
,
135 DBUS_TYPE_STRING
, &target
,
136 DBUS_TYPE_STRING
, &mode
,
137 DBUS_TYPE_INVALID
)) {
138 log_error("Could not attach target and flag information to message.");
142 if (!(reply
= dbus_connection_send_with_reply_and_block(s
->bus
, m
, -1, &error
))) {
143 log_error("Failed to start unit: %s", bus_error_message(&error
));
149 dbus_message_unref(m
);
152 dbus_message_unref(reply
);
154 dbus_error_free(&error
);
157 static void request_process(Server
*s
, const struct init_request
*req
) {
161 if (req
->magic
!= INIT_MAGIC
) {
162 log_error("Got initctl request with invalid magic. Ignoring.");
168 case INIT_CMD_RUNLVL
:
169 if (!isprint(req
->runlevel
))
170 log_error("Got invalid runlevel. Ignoring.");
172 switch (req
->runlevel
) {
174 /* we are async anyway, so just use kill for reexec/reload */
177 if (kill(1, SIGTERM
) < 0)
178 log_error("kill() failed: %m");
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 */
190 if (kill(1, SIGHUP
) < 0)
191 log_error("kill() failed: %m");
195 change_runlevel(s
, req
->runlevel
);
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!");
205 case INIT_CMD_CHANGECONS
:
206 log_warning("Received console change initctl request. This is not implemented in systemd.");
209 case INIT_CMD_SETENV
:
210 case INIT_CMD_UNSETENV
:
211 log_warning("Received environment initctl request. This is not implemented in systemd.");
215 log_warning("Received unknown initctl request. Ignoring.");
220 static int fifo_process(Fifo
*f
) {
226 if ((l
= read(f
->fd
, ((uint8_t*) &f
->buffer
) + f
->bytes_read
, sizeof(f
->buffer
) - f
->bytes_read
)) <= 0) {
231 log_warning("Failed to read from fifo: %s", strerror(errno
));
236 assert(f
->bytes_read
<= sizeof(f
->buffer
));
238 if (f
->bytes_read
== sizeof(f
->buffer
)) {
239 request_process(f
->server
, &f
->buffer
);
246 static void fifo_free(Fifo
*f
) {
250 assert(f
->server
->n_fifos
> 0);
251 f
->server
->n_fifos
--;
252 LIST_REMOVE(Fifo
, fifo
, f
->server
->fifos
, f
);
257 epoll_ctl(f
->server
->epoll_fd
, EPOLL_CTL_DEL
, f
->fd
, NULL
);
259 close_nointr_nofail(f
->fd
);
265 static void server_done(Server
*s
) {
271 if (s
->epoll_fd
>= 0)
272 close_nointr_nofail(s
->epoll_fd
);
275 dbus_connection_flush(s
->bus
);
276 dbus_connection_close(s
->bus
);
277 dbus_connection_unref(s
->bus
);
281 static int server_init(Server
*s
, unsigned n_sockets
) {
287 assert(n_sockets
> 0);
289 dbus_error_init(&error
);
293 if ((s
->epoll_fd
= epoll_create1(EPOLL_CLOEXEC
)) < 0) {
295 log_error("Failed to create epoll object: %s", strerror(errno
));
299 for (i
= 0; i
< n_sockets
; i
++) {
300 struct epoll_event ev
;
304 fd
= SD_LISTEN_FDS_START
+i
;
306 if ((r
= sd_is_fifo(fd
, NULL
)) < 0) {
307 log_error("Failed to determine file descriptor type: %s", strerror(-r
));
312 log_error("Wrong file descriptor type.");
317 if (!(f
= new0(Fifo
, 1))) {
319 log_error("Failed to create fifo object: %s", strerror(errno
));
328 if (epoll_ctl(s
->epoll_fd
, EPOLL_CTL_ADD
, fd
, &ev
) < 0) {
331 log_error("Failed to add fifo fd to epoll object: %s", strerror(errno
));
336 LIST_PREPEND(Fifo
, fifo
, s
->fifos
, f
);
341 if (bus_connect(DBUS_BUS_SYSTEM
, &s
->bus
, NULL
, &error
) < 0) {
342 log_error("Failed to get D-Bus connection: %s", bus_error_message(&error
));
351 dbus_error_free(&error
);
355 static int process_event(Server
*s
, struct epoll_event
*ev
) {
361 if (!(ev
->events
& EPOLLIN
)) {
362 log_info("Got invalid event from epoll. (3)");
366 f
= (Fifo
*) ev
->data
.ptr
;
368 if ((r
= fifo_process(f
)) < 0) {
369 log_info("Got error on fifo: %s", strerror(-r
));
377 int main(int argc
, char *argv
[]) {
379 int r
= EXIT_FAILURE
, n
;
381 if (getppid() != 1) {
382 log_error("This program should be invoked by init only.");
387 log_error("This program does not take arguments.");
391 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG
);
392 log_parse_environment();
397 if ((n
= sd_listen_fds(true)) < 0) {
398 log_error("Failed to read listening file descriptors from environment: %s", strerror(-r
));
402 if (n
<= 0 || n
> SERVER_FD_MAX
) {
403 log_error("No or too many file descriptors passed.");
407 if (server_init(&server
, (unsigned) n
) < 0)
410 log_debug("systemd-initctl running as pid %lu", (unsigned long) getpid());
414 "STATUS=Processing requests...");
416 while (!server
.quit
) {
417 struct epoll_event event
;
420 if ((k
= epoll_wait(server
.epoll_fd
,
422 TIMEOUT_MSEC
)) < 0) {
427 log_error("epoll_wait() failed: %s", strerror(errno
));
434 if (process_event(&server
, &event
) < 0)
440 log_debug("systemd-initctl stopped as pid %lu", (unsigned long) getpid());
444 "STATUS=Shutting down...");
446 server_done(&server
);