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 #define SERVER_FD_START 3
44 #define SERVER_FD_MAX 16
45 #define TIMEOUT ((int) (10*MSEC_PER_SEC))
47 typedef struct Fifo Fifo;
49 typedef struct Server {
52 LIST_HEAD(Fifo, fifos);
63 struct init_request buffer;
66 LIST_FIELDS(Fifo, fifo);
69 static const char *translate_runlevel(int runlevel) {
79 return "rescue.target";
82 return "runlevel2.target";
85 return "runlevel3.target";
88 return "runlevel4.target";
91 return "runlevel5.target";
94 return "reboot.target";
101 static void change_runlevel(Server *s, int runlevel) {
103 DBusMessage *m = NULL, *reply = NULL;
105 const char *path, *replace = "replace";
109 dbus_error_init(&error);
111 if (!(target = translate_runlevel(runlevel))) {
112 log_warning("Got request for unknown runlevel %c, ignoring.", runlevel);
116 log_debug("Running request %s", target);
118 if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1", "GetUnit"))) {
119 log_error("Could not allocate message.");
123 if (!dbus_message_append_args(m,
124 DBUS_TYPE_STRING, &target,
125 DBUS_TYPE_INVALID)) {
126 log_error("Could not attach group information to signal message.");
130 if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
131 log_error("Failed to get unit path: %s", error.message);
135 if (!dbus_message_get_args(reply, &error,
136 DBUS_TYPE_OBJECT_PATH, &path,
137 DBUS_TYPE_INVALID)) {
138 log_error("Failed to parse unit path: %s", error.message);
142 dbus_message_unref(m);
143 if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", path, "org.freedesktop.systemd1.Unit", "Start"))) {
144 log_error("Could not allocate message.");
148 if (!dbus_message_append_args(m,
149 DBUS_TYPE_STRING, &replace,
150 DBUS_TYPE_INVALID)) {
151 log_error("Could not attach group information to signal message.");
155 dbus_message_unref(reply);
156 if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
157 log_error("Failed to start unit: %s", error.message);
163 dbus_message_unref(m);
166 dbus_message_unref(reply);
168 dbus_error_free(&error);
171 static void request_process(Server *s, const struct init_request *req) {
175 if (req->magic != INIT_MAGIC) {
176 log_error("Got initctl request with invalid magic. Ignoring.");
182 case INIT_CMD_RUNLVL:
183 if (!isprint(req->runlevel))
184 log_error("Got invalid runlevel. Ignoring.");
186 change_runlevel(s, req->runlevel);
189 case INIT_CMD_POWERFAIL:
190 case INIT_CMD_POWERFAILNOW:
191 case INIT_CMD_POWEROK:
192 log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!");
195 case INIT_CMD_CHANGECONS:
196 log_warning("Received console change initctl request. This is not implemented in systemd.");
199 case INIT_CMD_SETENV:
200 case INIT_CMD_UNSETENV:
201 log_warning("Received environment initctl request. This is not implemented in systemd.");
205 log_warning("Received unknown initctl request. Ignoring.");
210 static int fifo_process(Fifo *f) {
216 if ((l = read(f->fd, ((uint8_t*) &f->buffer) + f->bytes_read, sizeof(f->buffer) - f->bytes_read)) <= 0) {
221 log_warning("Failed to read from fifo: %s", strerror(errno));
226 assert(f->bytes_read <= sizeof(f->buffer));
228 if (f->bytes_read == sizeof(f->buffer)) {
229 request_process(f->server, &f->buffer);
236 static void fifo_free(Fifo *f) {
240 assert(f->server->n_fifos > 0);
241 f->server->n_fifos--;
242 LIST_REMOVE(Fifo, fifo, f->server->fifos, f);
247 epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL);
249 assert_se(close_nointr(f->fd) == 0);
255 static int verify_environment(unsigned *n_sockets) {
256 unsigned long long pid;
261 assert_se(n_sockets);
263 if (!(e = getenv("LISTEN_PID"))) {
264 log_error("Missing $LISTEN_PID environment variable.");
268 if ((r = safe_atollu(e, &pid)) < 0) {
269 log_error("Failed to parse $LISTEN_PID: %s", strerror(-r));
273 if (pid != (unsigned long long) getpid()) {
274 log_error("Socket nor for me.");
278 if (!(e = getenv("LISTEN_FDS"))) {
279 log_error("Missing $LISTEN_FDS environment variable.");
283 if ((r = safe_atou(e, &ns)) < 0) {
284 log_error("Failed to parse $LISTEN_FDS: %s", strerror(-r));
288 if (ns <= 0 || ns > SERVER_FD_MAX) {
289 log_error("Wrong number of file descriptors passed: %s", e);
298 static void server_done(Server *s) {
304 if (s->epoll_fd >= 0)
305 assert_se(close_nointr(s->epoll_fd) == 0);
308 dbus_connection_unref(s->bus);
311 static int server_init(Server *s, unsigned n_sockets) {
317 assert(n_sockets > 0);
319 dbus_error_init(&error);
323 if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) {
325 log_error("Failed to create epoll object: %s", strerror(errno));
329 for (i = 0; i < n_sockets; i++) {
330 struct epoll_event ev;
333 if (!(f = new0(Fifo, 1))) {
335 log_error("Failed to create fifo object: %s", strerror(errno));
344 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, SERVER_FD_START+i, &ev) < 0) {
347 log_error("Failed to add fifo fd to epoll object: %s", strerror(errno));
351 f->fd = SERVER_FD_START+i;
352 LIST_PREPEND(Fifo, fifo, s->fifos, f);
357 if (!(s->bus = dbus_bus_get(DBUS_BUS_SYSTEM, &error))) {
358 log_error("Failed to get D-Bus connection: %s", error.message);
367 dbus_error_free(&error);
371 static int process_event(Server *s, struct epoll_event *ev) {
377 if (!(ev->events & EPOLLIN)) {
378 log_info("Got invalid event from epoll. (3)");
382 f = (Fifo*) ev->data.ptr;
384 if ((r = fifo_process(f)) < 0) {
385 log_info("Got error on fifo: %s", strerror(-r));
393 int main(int argc, char *argv[]) {
398 log_info("systemd-initctl running as pid %llu", (unsigned long long) getpid());
400 if (verify_environment(&n) < 0)
403 if (server_init(&server, n) < 0)
407 struct epoll_event event;
410 if ((k = epoll_wait(server.epoll_fd,
417 log_error("epoll_wait() failed: %s", strerror(errno));
424 if ((k = process_event(&server, &event)) < 0)
430 server_done(&server);
432 log_info("systemd-initctl stopped as pid %llu", (unsigned long long) getpid());