1 /* SPDX-License-Identifier: LGPL-2.1+ */
10 #include "sd-daemon.h"
12 #include "alloc-util.h"
13 #include "bus-error.h"
17 #include "format-util.h"
23 #include "process-util.h"
25 #define SERVER_FD_MAX 16
26 #define TIMEOUT_MSEC ((int) (DEFAULT_EXIT_USEC/USEC_PER_MSEC))
28 typedef struct Fifo Fifo
;
30 typedef struct Server
{
33 LIST_HEAD(Fifo
, fifos
);
46 struct init_request buffer
;
49 LIST_FIELDS(Fifo
, fifo
);
52 static const char *translate_runlevel(int runlevel
, bool *isolate
) {
58 { '0', SPECIAL_POWEROFF_TARGET
, false },
59 { '1', SPECIAL_RESCUE_TARGET
, true },
60 { 's', SPECIAL_RESCUE_TARGET
, true },
61 { 'S', SPECIAL_RESCUE_TARGET
, true },
62 { '2', SPECIAL_MULTI_USER_TARGET
, true },
63 { '3', SPECIAL_MULTI_USER_TARGET
, true },
64 { '4', SPECIAL_MULTI_USER_TARGET
, true },
65 { '5', SPECIAL_GRAPHICAL_TARGET
, true },
66 { '6', SPECIAL_REBOOT_TARGET
, false },
73 for (i
= 0; i
< ELEMENTSOF(table
); i
++)
74 if (table
[i
].runlevel
== runlevel
) {
75 *isolate
= table
[i
].isolate
;
76 if (runlevel
== '6' && kexec_loaded())
77 return SPECIAL_KEXEC_TARGET
;
78 return table
[i
].special
;
84 static int change_runlevel(Server
*s
, int runlevel
) {
86 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
93 target
= translate_runlevel(runlevel
, &isolate
);
95 log_warning("Got request for unknown runlevel %c, ignoring.", runlevel
);
102 mode
= "replace-irreversibly";
104 log_debug("Running request %s/start/%s", target
, mode
);
106 r
= sd_bus_call_method(
108 "org.freedesktop.systemd1",
109 "/org/freedesktop/systemd1",
110 "org.freedesktop.systemd1.Manager",
116 return log_error_errno(r
, "Failed to change runlevel: %s", bus_error_message(&error
, -r
));
121 static void request_process(Server
*s
, const struct init_request
*req
) {
125 if (req
->magic
!= INIT_MAGIC
) {
126 log_error("Got initctl request with invalid magic. Ignoring.");
132 case INIT_CMD_RUNLVL
:
133 if (!isprint(req
->runlevel
))
134 log_error("Got invalid runlevel. Ignoring.");
136 switch (req
->runlevel
) {
138 /* we are async anyway, so just use kill for reexec/reload */
141 if (kill(1, SIGTERM
) < 0)
142 log_error_errno(errno
, "kill() failed: %m");
144 /* The bus connection will be
145 * terminated if PID 1 is reexecuted,
146 * hence let's just exit here, and
147 * rely on that we'll be restarted on
148 * the next request */
154 if (kill(1, SIGHUP
) < 0)
155 log_error_errno(errno
, "kill() failed: %m");
159 (void) change_runlevel(s
, req
->runlevel
);
163 case INIT_CMD_POWERFAIL
:
164 case INIT_CMD_POWERFAILNOW
:
165 case INIT_CMD_POWEROK
:
166 log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!");
169 case INIT_CMD_CHANGECONS
:
170 log_warning("Received console change initctl request. This is not implemented in systemd.");
173 case INIT_CMD_SETENV
:
174 case INIT_CMD_UNSETENV
:
175 log_warning("Received environment initctl request. This is not implemented in systemd.");
179 log_warning("Received unknown initctl request. Ignoring.");
184 static int fifo_process(Fifo
*f
) {
191 ((uint8_t*) &f
->buffer
) + f
->bytes_read
,
192 sizeof(f
->buffer
) - f
->bytes_read
);
197 return log_warning_errno(errno
, "Failed to read from fifo: %m");
201 assert(f
->bytes_read
<= sizeof(f
->buffer
));
203 if (f
->bytes_read
== sizeof(f
->buffer
)) {
204 request_process(f
->server
, &f
->buffer
);
211 static void fifo_free(Fifo
*f
) {
215 assert(f
->server
->n_fifos
> 0);
216 f
->server
->n_fifos
--;
217 LIST_REMOVE(fifo
, f
->server
->fifos
, f
);
222 epoll_ctl(f
->server
->epoll_fd
, EPOLL_CTL_DEL
, f
->fd
, NULL
);
230 static void server_done(Server
*s
) {
236 safe_close(s
->epoll_fd
);
239 sd_bus_flush(s
->bus
);
240 sd_bus_unref(s
->bus
);
244 static int server_init(Server
*s
, unsigned n_sockets
) {
249 assert(n_sockets
> 0);
253 s
->epoll_fd
= epoll_create1(EPOLL_CLOEXEC
);
254 if (s
->epoll_fd
< 0) {
255 r
= log_error_errno(errno
,
256 "Failed to create epoll object: %m");
260 for (i
= 0; i
< n_sockets
; i
++) {
261 struct epoll_event ev
;
265 fd
= SD_LISTEN_FDS_START
+i
;
267 r
= sd_is_fifo(fd
, NULL
);
269 log_error_errno(r
, "Failed to determine file descriptor type: %m");
274 log_error("Wrong file descriptor type.");
282 log_error_errno(errno
, "Failed to create fifo object: %m");
291 if (epoll_ctl(s
->epoll_fd
, EPOLL_CTL_ADD
, fd
, &ev
) < 0) {
294 log_error_errno(errno
, "Failed to add fifo fd to epoll object: %m");
299 LIST_PREPEND(fifo
, s
->fifos
, f
);
304 r
= bus_connect_system_systemd(&s
->bus
);
306 log_error_errno(r
, "Failed to get D-Bus connection: %m");
319 static int process_event(Server
*s
, struct epoll_event
*ev
) {
325 if (!(ev
->events
& EPOLLIN
)) {
326 log_info("Got invalid event from epoll. (3)");
330 f
= (Fifo
*) ev
->data
.ptr
;
333 log_info_errno(r
, "Got error on fifo: %m");
341 int main(int argc
, char *argv
[]) {
343 int r
= EXIT_FAILURE
, n
;
345 if (getppid() != 1) {
346 log_error("This program should be invoked by init only.");
351 log_error("This program does not take arguments.");
359 n
= sd_listen_fds(true);
361 log_error_errno(r
, "Failed to read listening file descriptors from environment: %m");
365 if (n
<= 0 || n
> SERVER_FD_MAX
) {
366 log_error("No or too many file descriptors passed.");
370 if (server_init(&server
, (unsigned) n
) < 0)
373 log_debug("systemd-initctl running as pid "PID_FMT
, getpid_cached());
377 "STATUS=Processing requests...");
379 while (!server
.quit
) {
380 struct epoll_event event
;
383 k
= epoll_wait(server
.epoll_fd
, &event
, 1, TIMEOUT_MSEC
);
387 log_error_errno(errno
, "epoll_wait() failed: %m");
394 if (process_event(&server
, &event
) < 0)
400 log_debug("systemd-initctl stopped as pid "PID_FMT
, getpid_cached());
405 "STATUS=Shutting down...");
407 server_done(&server
);