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 if (runlevel == '6' && kexec_loaded())
97 return SPECIAL_KEXEC_TARGET;
98 return table[i].special;
104 static void change_runlevel(Server *s, int runlevel) {
106 DBusMessage *m = NULL, *reply = NULL;
109 bool isolate = false;
113 dbus_error_init(&error);
115 if (!(target = translate_runlevel(runlevel, &isolate))) {
116 log_warning("Got request for unknown runlevel %c, ignoring.", runlevel);
125 log_debug("Running request %s/start/%s", target, mode);
127 if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit"))) {
128 log_error("Could not allocate message.");
132 if (!dbus_message_append_args(m,
133 DBUS_TYPE_STRING, &target,
134 DBUS_TYPE_STRING, &mode,
135 DBUS_TYPE_INVALID)) {
136 log_error("Could not attach target and flag information to message.");
140 if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
141 log_error("Failed to start unit: %s", bus_error_message(&error));
147 dbus_message_unref(m);
150 dbus_message_unref(reply);
152 dbus_error_free(&error);
155 static void request_process(Server *s, const struct init_request *req) {
159 if (req->magic != INIT_MAGIC) {
160 log_error("Got initctl request with invalid magic. Ignoring.");
166 case INIT_CMD_RUNLVL:
167 if (!isprint(req->runlevel))
168 log_error("Got invalid runlevel. Ignoring.");
170 switch (req->runlevel) {
172 /* we are async anyway, so just use kill for reexec/reload */
175 if (kill(1, SIGTERM) < 0)
176 log_error("kill() failed: %m");
181 if (kill(1, SIGHUP) < 0)
182 log_error("kill() failed: %m");
186 change_runlevel(s, req->runlevel);
190 case INIT_CMD_POWERFAIL:
191 case INIT_CMD_POWERFAILNOW:
192 case INIT_CMD_POWEROK:
193 log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!");
196 case INIT_CMD_CHANGECONS:
197 log_warning("Received console change initctl request. This is not implemented in systemd.");
200 case INIT_CMD_SETENV:
201 case INIT_CMD_UNSETENV:
202 log_warning("Received environment initctl request. This is not implemented in systemd.");
206 log_warning("Received unknown initctl request. Ignoring.");
211 static int fifo_process(Fifo *f) {
217 if ((l = read(f->fd, ((uint8_t*) &f->buffer) + f->bytes_read, sizeof(f->buffer) - f->bytes_read)) <= 0) {
222 log_warning("Failed to read from fifo: %s", strerror(errno));
227 assert(f->bytes_read <= sizeof(f->buffer));
229 if (f->bytes_read == sizeof(f->buffer)) {
230 request_process(f->server, &f->buffer);
237 static void fifo_free(Fifo *f) {
241 assert(f->server->n_fifos > 0);
242 f->server->n_fifos--;
243 LIST_REMOVE(Fifo, fifo, f->server->fifos, f);
248 epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL);
250 close_nointr_nofail(f->fd);
256 static void server_done(Server *s) {
262 if (s->epoll_fd >= 0)
263 close_nointr_nofail(s->epoll_fd);
266 dbus_connection_flush(s->bus);
267 dbus_connection_close(s->bus);
268 dbus_connection_unref(s->bus);
272 static int server_init(Server *s, unsigned n_sockets) {
278 assert(n_sockets > 0);
280 dbus_error_init(&error);
284 if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) {
286 log_error("Failed to create epoll object: %s", strerror(errno));
290 for (i = 0; i < n_sockets; i++) {
291 struct epoll_event ev;
295 fd = SD_LISTEN_FDS_START+i;
297 if ((r = sd_is_fifo(fd, NULL)) < 0) {
298 log_error("Failed to determine file descriptor type: %s", strerror(-r));
303 log_error("Wrong file descriptor type.");
308 if (!(f = new0(Fifo, 1))) {
310 log_error("Failed to create fifo object: %s", strerror(errno));
319 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
322 log_error("Failed to add fifo fd to epoll object: %s", strerror(errno));
327 LIST_PREPEND(Fifo, fifo, s->fifos, f);
332 if (bus_connect(DBUS_BUS_SYSTEM, &s->bus, NULL, &error) < 0) {
333 log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
342 dbus_error_free(&error);
346 static int process_event(Server *s, struct epoll_event *ev) {
352 if (!(ev->events & EPOLLIN)) {
353 log_info("Got invalid event from epoll. (3)");
357 f = (Fifo*) ev->data.ptr;
359 if ((r = fifo_process(f)) < 0) {
360 log_info("Got error on fifo: %s", strerror(-r));
368 int main(int argc, char *argv[]) {
370 int r = EXIT_FAILURE, n;
372 if (getppid() != 1) {
373 log_error("This program should be invoked by init only.");
378 log_error("This program does not take arguments.");
382 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
383 log_parse_environment();
388 if ((n = sd_listen_fds(true)) < 0) {
389 log_error("Failed to read listening file descriptors from environment: %s", strerror(-r));
393 if (n <= 0 || n > SERVER_FD_MAX) {
394 log_error("No or too many file descriptors passed.");
398 if (server_init(&server, (unsigned) n) < 0)
401 log_debug("systemd-initctl running as pid %lu", (unsigned long) getpid());
405 "STATUS=Processing requests...");
408 struct epoll_event event;
411 if ((k = epoll_wait(server.epoll_fd,
413 TIMEOUT_MSEC)) < 0) {
418 log_error("epoll_wait() failed: %s", strerror(errno));
425 if (process_event(&server, &event) < 0)
431 log_debug("systemd-initctl stopped as pid %lu", (unsigned long) getpid());
435 "STATUS=Shutting down...");
437 server_done(&server);