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"
46 #define SERVER_FD_MAX 16
47 #define TIMEOUT ((int) (10*MSEC_PER_SEC))
49 typedef struct Fifo Fifo;
51 typedef struct Server {
54 LIST_HEAD(Fifo, fifos);
65 struct init_request buffer;
68 LIST_FIELDS(Fifo, fifo);
71 static const char *translate_runlevel(int runlevel, bool *isolate) {
77 { '0', SPECIAL_POWEROFF_TARGET, false },
78 { '1', SPECIAL_RESCUE_TARGET, true },
79 { 's', SPECIAL_RESCUE_TARGET, true },
80 { 'S', SPECIAL_RESCUE_TARGET, true },
81 { '2', SPECIAL_RUNLEVEL2_TARGET, true },
82 { '3', SPECIAL_RUNLEVEL3_TARGET, true },
83 { '4', SPECIAL_RUNLEVEL4_TARGET, true },
84 { '5', SPECIAL_RUNLEVEL5_TARGET, true },
85 { '6', SPECIAL_REBOOT_TARGET, false },
92 for (i = 0; i < ELEMENTSOF(table); i++)
93 if (table[i].runlevel == runlevel) {
94 *isolate = table[i].isolate;
95 return table[i].special;
101 static void change_runlevel(Server *s, int runlevel) {
103 DBusMessage *m = NULL, *reply = NULL;
106 bool isolate = false;
110 dbus_error_init(&error);
112 if (!(target = translate_runlevel(runlevel, &isolate))) {
113 log_warning("Got request for unknown runlevel %c, ignoring.", runlevel);
122 log_debug("Running request %s/start/%s", target, mode);
124 if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit"))) {
125 log_error("Could not allocate message.");
129 if (!dbus_message_append_args(m,
130 DBUS_TYPE_STRING, &target,
131 DBUS_TYPE_STRING, &mode,
132 DBUS_TYPE_INVALID)) {
133 log_error("Could not attach target and flag information to message.");
137 if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
138 log_error("Failed to start unit: %s", bus_error_message(&error));
144 dbus_message_unref(m);
147 dbus_message_unref(reply);
149 dbus_error_free(&error);
152 static void request_process(Server *s, const struct init_request *req) {
156 if (req->magic != INIT_MAGIC) {
157 log_error("Got initctl request with invalid magic. Ignoring.");
163 case INIT_CMD_RUNLVL:
164 if (!isprint(req->runlevel))
165 log_error("Got invalid runlevel. Ignoring.");
167 change_runlevel(s, req->runlevel);
170 case INIT_CMD_POWERFAIL:
171 case INIT_CMD_POWERFAILNOW:
172 case INIT_CMD_POWEROK:
173 log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!");
176 case INIT_CMD_CHANGECONS:
177 log_warning("Received console change initctl request. This is not implemented in systemd.");
180 case INIT_CMD_SETENV:
181 case INIT_CMD_UNSETENV:
182 log_warning("Received environment initctl request. This is not implemented in systemd.");
186 log_warning("Received unknown initctl request. Ignoring.");
191 static int fifo_process(Fifo *f) {
197 if ((l = read(f->fd, ((uint8_t*) &f->buffer) + f->bytes_read, sizeof(f->buffer) - f->bytes_read)) <= 0) {
202 log_warning("Failed to read from fifo: %s", strerror(errno));
207 assert(f->bytes_read <= sizeof(f->buffer));
209 if (f->bytes_read == sizeof(f->buffer)) {
210 request_process(f->server, &f->buffer);
217 static void fifo_free(Fifo *f) {
221 assert(f->server->n_fifos > 0);
222 f->server->n_fifos--;
223 LIST_REMOVE(Fifo, fifo, f->server->fifos, f);
228 epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL);
230 close_nointr_nofail(f->fd);
236 static void server_done(Server *s) {
242 if (s->epoll_fd >= 0)
243 close_nointr_nofail(s->epoll_fd);
246 dbus_connection_flush(s->bus);
247 dbus_connection_close(s->bus);
248 dbus_connection_unref(s->bus);
252 static int server_init(Server *s, unsigned n_sockets) {
258 assert(n_sockets > 0);
260 dbus_error_init(&error);
264 if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) {
266 log_error("Failed to create epoll object: %s", strerror(errno));
270 for (i = 0; i < n_sockets; i++) {
271 struct epoll_event ev;
275 fd = SD_LISTEN_FDS_START+i;
277 if ((r = sd_is_fifo(fd, NULL)) < 0) {
278 log_error("Failed to determine file descriptor type: %s", strerror(-r));
283 log_error("Wrong file descriptor type.");
288 if (!(f = new0(Fifo, 1))) {
290 log_error("Failed to create fifo object: %s", strerror(errno));
299 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
302 log_error("Failed to add fifo fd to epoll object: %s", strerror(errno));
307 LIST_PREPEND(Fifo, fifo, s->fifos, f);
312 if (bus_connect(DBUS_BUS_SYSTEM, &s->bus, NULL, &error) < 0) {
313 log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
322 dbus_error_free(&error);
326 static int process_event(Server *s, struct epoll_event *ev) {
332 if (!(ev->events & EPOLLIN)) {
333 log_info("Got invalid event from epoll. (3)");
337 f = (Fifo*) ev->data.ptr;
339 if ((r = fifo_process(f)) < 0) {
340 log_info("Got error on fifo: %s", strerror(-r));
348 int main(int argc, char *argv[]) {
350 int r = EXIT_FAILURE, n;
352 if (getppid() != 1) {
353 log_error("This program should be invoked by init only.");
358 log_error("This program does not take arguments.");
362 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
363 log_parse_environment();
366 if ((n = sd_listen_fds(true)) < 0) {
367 log_error("Failed to read listening file descriptors from environment: %s", strerror(-r));
371 if (n <= 0 || n > SERVER_FD_MAX) {
372 log_error("No or too many file descriptors passed.");
376 if (server_init(&server, (unsigned) n) < 0)
379 log_debug("systemd-initctl running as pid %lu", (unsigned long) getpid());
383 "STATUS=Processing requests...");
386 struct epoll_event event;
389 if ((k = epoll_wait(server.epoll_fd,
396 log_error("epoll_wait() failed: %s", strerror(errno));
403 if (process_event(&server, &event) < 0)
409 log_debug("systemd-initctl stopped as pid %lu", (unsigned long) getpid());
413 "STATUS=Shutting down...");
415 server_done(&server);