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 #include "sd-daemon.h"
45 #define SERVER_FD_MAX 16
46 #define TIMEOUT ((int) (10*MSEC_PER_SEC))
48 typedef struct Fifo Fifo
;
50 typedef struct Server
{
53 LIST_HEAD(Fifo
, fifos
);
64 struct init_request buffer
;
67 LIST_FIELDS(Fifo
, fifo
);
70 static const char *translate_runlevel(int runlevel
) {
75 { '0', SPECIAL_RUNLEVEL0_TARGET
},
76 { '1', SPECIAL_RUNLEVEL1_TARGET
},
77 { 's', SPECIAL_RUNLEVEL1_TARGET
},
78 { 'S', SPECIAL_RUNLEVEL1_TARGET
},
79 { '2', SPECIAL_RUNLEVEL2_TARGET
},
80 { '3', SPECIAL_RUNLEVEL3_TARGET
},
81 { '4', SPECIAL_RUNLEVEL4_TARGET
},
82 { '5', SPECIAL_RUNLEVEL5_TARGET
},
83 { '6', SPECIAL_RUNLEVEL6_TARGET
},
88 for (i
= 0; i
< ELEMENTSOF(table
); i
++)
89 if (table
[i
].runlevel
== runlevel
)
90 return table
[i
].special
;
95 static void change_runlevel(Server
*s
, int runlevel
) {
97 DBusMessage
*m
= NULL
, *reply
= NULL
;
99 const char *replace
= "replace";
103 dbus_error_init(&error
);
105 if (!(target
= translate_runlevel(runlevel
))) {
106 log_warning("Got request for unknown runlevel %c, ignoring.", runlevel
);
110 log_debug("Running request %s", target
);
112 if (!(m
= dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit"))) {
113 log_error("Could not allocate message.");
117 if (!dbus_message_append_args(m
,
118 DBUS_TYPE_STRING
, &target
,
119 DBUS_TYPE_STRING
, &replace
,
120 DBUS_TYPE_INVALID
)) {
121 log_error("Could not attach target and flag information to signal message.");
125 if (!(reply
= dbus_connection_send_with_reply_and_block(s
->bus
, m
, -1, &error
))) {
126 log_error("Failed to start unit: %s", error
.message
);
132 dbus_message_unref(m
);
135 dbus_message_unref(reply
);
137 dbus_error_free(&error
);
140 static void request_process(Server
*s
, const struct init_request
*req
) {
144 if (req
->magic
!= INIT_MAGIC
) {
145 log_error("Got initctl request with invalid magic. Ignoring.");
151 case INIT_CMD_RUNLVL
:
152 if (!isprint(req
->runlevel
))
153 log_error("Got invalid runlevel. Ignoring.");
155 change_runlevel(s
, req
->runlevel
);
158 case INIT_CMD_POWERFAIL
:
159 case INIT_CMD_POWERFAILNOW
:
160 case INIT_CMD_POWEROK
:
161 log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!");
164 case INIT_CMD_CHANGECONS
:
165 log_warning("Received console change initctl request. This is not implemented in systemd.");
168 case INIT_CMD_SETENV
:
169 case INIT_CMD_UNSETENV
:
170 log_warning("Received environment initctl request. This is not implemented in systemd.");
174 log_warning("Received unknown initctl request. Ignoring.");
179 static int fifo_process(Fifo
*f
) {
185 if ((l
= read(f
->fd
, ((uint8_t*) &f
->buffer
) + f
->bytes_read
, sizeof(f
->buffer
) - f
->bytes_read
)) <= 0) {
190 log_warning("Failed to read from fifo: %s", strerror(errno
));
195 assert(f
->bytes_read
<= sizeof(f
->buffer
));
197 if (f
->bytes_read
== sizeof(f
->buffer
)) {
198 request_process(f
->server
, &f
->buffer
);
205 static void fifo_free(Fifo
*f
) {
209 assert(f
->server
->n_fifos
> 0);
210 f
->server
->n_fifos
--;
211 LIST_REMOVE(Fifo
, fifo
, f
->server
->fifos
, f
);
216 epoll_ctl(f
->server
->epoll_fd
, EPOLL_CTL_DEL
, f
->fd
, NULL
);
218 close_nointr_nofail(f
->fd
);
224 static void server_done(Server
*s
) {
230 if (s
->epoll_fd
>= 0)
231 close_nointr_nofail(s
->epoll_fd
);
234 dbus_connection_set_exit_on_disconnect(s
->bus
, FALSE
);
235 dbus_connection_unref(s
->bus
);
239 static int server_init(Server
*s
, unsigned n_sockets
) {
245 assert(n_sockets
> 0);
247 dbus_error_init(&error
);
251 if ((s
->epoll_fd
= epoll_create1(EPOLL_CLOEXEC
)) < 0) {
253 log_error("Failed to create epoll object: %s", strerror(errno
));
257 for (i
= 0; i
< n_sockets
; i
++) {
258 struct epoll_event ev
;
262 fd
= SD_LISTEN_FDS_START
+i
;
264 if ((r
= sd_is_fifo(fd
, NULL
)) < 0) {
265 log_error("Failed to determine file descriptor type: %s", strerror(-r
));
270 log_error("Wrong file descriptor type.");
275 if (!(f
= new0(Fifo
, 1))) {
277 log_error("Failed to create fifo object: %s", strerror(errno
));
286 if (epoll_ctl(s
->epoll_fd
, EPOLL_CTL_ADD
, fd
, &ev
) < 0) {
289 log_error("Failed to add fifo fd to epoll object: %s", strerror(errno
));
293 f
->fd
= SD_LISTEN_FDS_START
+i
;
294 LIST_PREPEND(Fifo
, fifo
, s
->fifos
, f
);
299 if (!(s
->bus
= dbus_bus_get(DBUS_BUS_SYSTEM
, &error
))) {
300 log_error("Failed to get D-Bus connection: %s", error
.message
);
309 dbus_error_free(&error
);
313 static int process_event(Server
*s
, struct epoll_event
*ev
) {
319 if (!(ev
->events
& EPOLLIN
)) {
320 log_info("Got invalid event from epoll. (3)");
324 f
= (Fifo
*) ev
->data
.ptr
;
326 if ((r
= fifo_process(f
)) < 0) {
327 log_info("Got error on fifo: %s", strerror(-r
));
335 int main(int argc
, char *argv
[]) {
339 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG
);
340 log_parse_environment();
342 log_info("systemd-initctl running as pid %llu", (unsigned long long) getpid());
344 if ((n
= sd_listen_fds(true)) < 0) {
345 log_error("Failed to read listening file descriptors from environment: %s", strerror(-r
));
349 if (n
<= 0 || n
> SERVER_FD_MAX
) {
350 log_error("No or too many file descriptors passed.");
354 if (server_init(&server
, (unsigned) n
) < 0)
359 "STATUS=Processing requests...");
362 struct epoll_event event
;
365 if ((k
= epoll_wait(server
.epoll_fd
,
372 log_error("epoll_wait() failed: %s", strerror(errno
));
379 if ((k
= process_event(&server
, &event
)) < 0)
386 "STATUS=Shutting down...");
388 server_done(&server
);
390 log_info("systemd-initctl stopped as pid %llu", (unsigned long long) getpid());