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git.ipfire.org Git - people/ms/systemd.git/blob - initctl.c
1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
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>
43 #define SERVER_FD_START 3
44 #define SERVER_FD_MAX 16
45 #define TIMEOUT ((int) (10*MSEC_PER_SEC))
47 typedef struct Fifo Fifo
;
49 typedef struct Server
{
52 LIST_HEAD(Fifo
, fifos
);
63 struct init_request buffer
;
66 LIST_FIELDS(Fifo
, fifo
);
69 static const char *translate_runlevel(int runlevel
) {
79 return "rescue.target";
82 return "runlevel2.target";
85 return "runlevel3.target";
88 return "runlevel4.target";
91 return "runlevel5.target";
94 return "reboot.target";
101 static void change_runlevel(Server
*s
, int runlevel
) {
103 DBusMessage
*m
= NULL
, *reply
= NULL
;
105 const char *path
, *replace
= "replace";
109 dbus_error_init(&error
);
111 if (!(target
= translate_runlevel(runlevel
))) {
112 log_warning("Got request for unknown runlevel %c, ignoring.", runlevel
);
116 log_debug("Running request %s", target
);
118 if (!(m
= dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "GetUnit"))) {
119 log_error("Could not allocate message.");
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.");
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
);
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
);
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.");
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.");
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
);
163 dbus_message_unref(m
);
166 dbus_message_unref(reply
);
168 dbus_error_free(&error
);
171 static void request_process(Server
*s
, const struct init_request
*req
) {
175 if (req
->magic
!= INIT_MAGIC
) {
176 log_error("Got initctl request with invalid magic. Ignoring.");
182 case INIT_CMD_RUNLVL
:
183 if (!isprint(req
->runlevel
))
184 log_error("Got invalid runlevel. Ignoring.");
186 change_runlevel(s
, req
->runlevel
);
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!");
195 case INIT_CMD_CHANGECONS
:
196 log_warning("Received console change initctl request. This is not implemented in systemd.");
199 case INIT_CMD_SETENV
:
200 case INIT_CMD_UNSETENV
:
201 log_warning("Received environment initctl request. This is not implemented in systemd.");
205 log_warning("Received unknown initctl request. Ignoring.");
210 static int fifo_process(Fifo
*f
) {
216 if ((l
= read(f
->fd
, ((uint8_t*) &f
->buffer
) + f
->bytes_read
, sizeof(f
->buffer
) - f
->bytes_read
)) <= 0) {
221 log_warning("Failed to read from fifo: %s", strerror(errno
));
226 assert(f
->bytes_read
<= sizeof(f
->buffer
));
228 if (f
->bytes_read
== sizeof(f
->buffer
)) {
229 request_process(f
->server
, &f
->buffer
);
236 static void fifo_free(Fifo
*f
) {
240 assert(f
->server
->n_fifos
> 0);
241 f
->server
->n_fifos
--;
242 LIST_REMOVE(Fifo
, fifo
, f
->server
->fifos
, f
);
247 epoll_ctl(f
->server
->epoll_fd
, EPOLL_CTL_DEL
, f
->fd
, NULL
);
249 close_nointr_nofail(f
->fd
);
255 static int verify_environment(unsigned *n_sockets
) {
256 unsigned long long pid
;
261 assert_se(n_sockets
);
263 if (!(e
= getenv("LISTEN_PID"))) {
264 log_error("Missing $LISTEN_PID environment variable.");
268 if ((r
= safe_atollu(e
, &pid
)) < 0) {
269 log_error("Failed to parse $LISTEN_PID: %s", strerror(-r
));
273 if (pid
!= (unsigned long long) getpid()) {
274 log_error("Socket nor for me.");
278 if (!(e
= getenv("LISTEN_FDS"))) {
279 log_error("Missing $LISTEN_FDS environment variable.");
283 if ((r
= safe_atou(e
, &ns
)) < 0) {
284 log_error("Failed to parse $LISTEN_FDS: %s", strerror(-r
));
288 if (ns
<= 0 || ns
> SERVER_FD_MAX
) {
289 log_error("Wrong number of file descriptors passed: %s", e
);
298 static void server_done(Server
*s
) {
304 if (s
->epoll_fd
>= 0)
305 close_nointr_nofail(s
->epoll_fd
);
308 dbus_connection_unref(s
->bus
);
311 static int server_init(Server
*s
, unsigned n_sockets
) {
317 assert(n_sockets
> 0);
319 dbus_error_init(&error
);
323 if ((s
->epoll_fd
= epoll_create1(EPOLL_CLOEXEC
)) < 0) {
325 log_error("Failed to create epoll object: %s", strerror(errno
));
329 for (i
= 0; i
< n_sockets
; i
++) {
330 struct epoll_event ev
;
333 if (!(f
= new0(Fifo
, 1))) {
335 log_error("Failed to create fifo object: %s", strerror(errno
));
344 if (epoll_ctl(s
->epoll_fd
, EPOLL_CTL_ADD
, SERVER_FD_START
+i
, &ev
) < 0) {
347 log_error("Failed to add fifo fd to epoll object: %s", strerror(errno
));
351 f
->fd
= SERVER_FD_START
+i
;
352 LIST_PREPEND(Fifo
, fifo
, s
->fifos
, f
);
357 if (!(s
->bus
= dbus_bus_get(DBUS_BUS_SYSTEM
, &error
))) {
358 log_error("Failed to get D-Bus connection: %s", error
.message
);
367 dbus_error_free(&error
);
371 static int process_event(Server
*s
, struct epoll_event
*ev
) {
377 if (!(ev
->events
& EPOLLIN
)) {
378 log_info("Got invalid event from epoll. (3)");
382 f
= (Fifo
*) ev
->data
.ptr
;
384 if ((r
= fifo_process(f
)) < 0) {
385 log_info("Got error on fifo: %s", strerror(-r
));
393 int main(int argc
, char *argv
[]) {
398 log_info("systemd-initctl running as pid %llu", (unsigned long long) getpid());
400 if (verify_environment(&n
) < 0)
403 if (server_init(&server
, n
) < 0)
407 struct epoll_event event
;
410 if ((k
= epoll_wait(server
.epoll_fd
,
417 log_error("epoll_wait() failed: %s", strerror(errno
));
424 if ((k
= process_event(&server
, &event
)) < 0)
430 server_done(&server
);
432 log_info("systemd-initctl stopped as pid %llu", (unsigned long long) getpid());