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>
43 #include "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);
66 struct init_request buffer;
69 LIST_FIELDS(Fifo, fifo);
72 static const char *translate_runlevel(int runlevel, bool *isolate) {
78 { '0', SPECIAL_POWEROFF_TARGET, false },
79 { '1', SPECIAL_RESCUE_TARGET, true },
80 { 's', SPECIAL_RESCUE_TARGET, true },
81 { 'S', SPECIAL_RESCUE_TARGET, true },
82 { '2', SPECIAL_RUNLEVEL2_TARGET, true },
83 { '3', SPECIAL_RUNLEVEL3_TARGET, true },
84 { '4', SPECIAL_RUNLEVEL4_TARGET, true },
85 { '5', SPECIAL_RUNLEVEL5_TARGET, true },
86 { '6', SPECIAL_REBOOT_TARGET, false },
93 for (i = 0; i < ELEMENTSOF(table); i++)
94 if (table[i].runlevel == runlevel) {
95 *isolate = table[i].isolate;
96 return table[i].special;
102 static void change_runlevel(Server *s, int runlevel) {
104 DBusMessage *m = NULL, *reply = NULL;
107 bool isolate = false;
111 dbus_error_init(&error);
113 if (!(target = translate_runlevel(runlevel, &isolate))) {
114 log_warning("Got request for unknown runlevel %c, ignoring.", runlevel);
123 log_debug("Running request %s/start/%s", target, mode);
125 if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit"))) {
126 log_error("Could not allocate message.");
130 if (!dbus_message_append_args(m,
131 DBUS_TYPE_STRING, &target,
132 DBUS_TYPE_STRING, &mode,
133 DBUS_TYPE_INVALID)) {
134 log_error("Could not attach target and flag information to message.");
138 if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
139 log_error("Failed to start unit: %s", bus_error_message(&error));
145 dbus_message_unref(m);
148 dbus_message_unref(reply);
150 dbus_error_free(&error);
153 static void request_process(Server *s, const struct init_request *req) {
157 if (req->magic != INIT_MAGIC) {
158 log_error("Got initctl request with invalid magic. Ignoring.");
164 case INIT_CMD_RUNLVL:
165 if (!isprint(req->runlevel))
166 log_error("Got invalid runlevel. Ignoring.");
168 switch (req->runlevel) {
170 /* we are async anyway, so just use kill for reexec/reload */
173 if (kill(1, SIGTERM) < 0)
174 log_error("kill() failed: %m");
179 if (kill(1, SIGHUP) < 0)
180 log_error("kill() failed: %m");
184 change_runlevel(s, req->runlevel);
188 case INIT_CMD_POWERFAIL:
189 case INIT_CMD_POWERFAILNOW:
190 case INIT_CMD_POWEROK:
191 log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!");
194 case INIT_CMD_CHANGECONS:
195 log_warning("Received console change initctl request. This is not implemented in systemd.");
198 case INIT_CMD_SETENV:
199 case INIT_CMD_UNSETENV:
200 log_warning("Received environment initctl request. This is not implemented in systemd.");
204 log_warning("Received unknown initctl request. Ignoring.");
209 static int fifo_process(Fifo *f) {
215 if ((l = read(f->fd, ((uint8_t*) &f->buffer) + f->bytes_read, sizeof(f->buffer) - f->bytes_read)) <= 0) {
220 log_warning("Failed to read from fifo: %s", strerror(errno));
225 assert(f->bytes_read <= sizeof(f->buffer));
227 if (f->bytes_read == sizeof(f->buffer)) {
228 request_process(f->server, &f->buffer);
235 static void fifo_free(Fifo *f) {
239 assert(f->server->n_fifos > 0);
240 f->server->n_fifos--;
241 LIST_REMOVE(Fifo, fifo, f->server->fifos, f);
246 epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL);
248 close_nointr_nofail(f->fd);
254 static void server_done(Server *s) {
260 if (s->epoll_fd >= 0)
261 close_nointr_nofail(s->epoll_fd);
264 dbus_connection_flush(s->bus);
265 dbus_connection_close(s->bus);
266 dbus_connection_unref(s->bus);
270 static int server_init(Server *s, unsigned n_sockets) {
276 assert(n_sockets > 0);
278 dbus_error_init(&error);
282 if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) {
284 log_error("Failed to create epoll object: %s", strerror(errno));
288 for (i = 0; i < n_sockets; i++) {
289 struct epoll_event ev;
293 fd = SD_LISTEN_FDS_START+i;
295 if ((r = sd_is_fifo(fd, NULL)) < 0) {
296 log_error("Failed to determine file descriptor type: %s", strerror(-r));
301 log_error("Wrong file descriptor type.");
306 if (!(f = new0(Fifo, 1))) {
308 log_error("Failed to create fifo object: %s", strerror(errno));
317 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
320 log_error("Failed to add fifo fd to epoll object: %s", strerror(errno));
325 LIST_PREPEND(Fifo, fifo, s->fifos, f);
330 if (bus_connect(DBUS_BUS_SYSTEM, &s->bus, NULL, &error) < 0) {
331 log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
340 dbus_error_free(&error);
344 static int process_event(Server *s, struct epoll_event *ev) {
350 if (!(ev->events & EPOLLIN)) {
351 log_info("Got invalid event from epoll. (3)");
355 f = (Fifo*) ev->data.ptr;
357 if ((r = fifo_process(f)) < 0) {
358 log_info("Got error on fifo: %s", strerror(-r));
366 int main(int argc, char *argv[]) {
368 int r = EXIT_FAILURE, n;
370 if (getppid() != 1) {
371 log_error("This program should be invoked by init only.");
376 log_error("This program does not take arguments.");
380 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
381 log_parse_environment();
386 if ((n = sd_listen_fds(true)) < 0) {
387 log_error("Failed to read listening file descriptors from environment: %s", strerror(-r));
391 if (n <= 0 || n > SERVER_FD_MAX) {
392 log_error("No or too many file descriptors passed.");
396 if (server_init(&server, (unsigned) n) < 0)
399 log_debug("systemd-initctl running as pid %lu", (unsigned long) getpid());
403 "STATUS=Processing requests...");
406 struct epoll_event event;
409 if ((k = epoll_wait(server.epoll_fd,
411 TIMEOUT_MSEC)) < 0) {
416 log_error("epoll_wait() failed: %s", strerror(errno));
423 if (process_event(&server, &event) < 0)
429 log_debug("systemd-initctl stopped as pid %lu", (unsigned long) getpid());
433 "STATUS=Shutting down...");
435 server_done(&server);