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 #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) {
76 { '0', SPECIAL_POWEROFF_TARGET },
77 { '1', SPECIAL_RESCUE_TARGET },
78 { 's', SPECIAL_RESCUE_TARGET },
79 { 'S', SPECIAL_RESCUE_TARGET },
80 { '2', SPECIAL_RUNLEVEL2_TARGET },
81 { '3', SPECIAL_RUNLEVEL3_TARGET },
82 { '4', SPECIAL_RUNLEVEL4_TARGET },
83 { '5', SPECIAL_RUNLEVEL5_TARGET },
84 { '6', SPECIAL_REBOOT_TARGET },
89 for (i = 0; i < ELEMENTSOF(table); i++)
90 if (table[i].runlevel == runlevel)
91 return table[i].special;
96 static void change_runlevel(Server *s, int runlevel) {
98 DBusMessage *m = NULL, *reply = NULL;
100 const char *replace = "replace";
104 dbus_error_init(&error);
106 if (!(target = translate_runlevel(runlevel))) {
107 log_warning("Got request for unknown runlevel %c, ignoring.", runlevel);
111 log_debug("Running request %s", target);
113 if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "StartUnit"))) {
114 log_error("Could not allocate message.");
118 if (!dbus_message_append_args(m,
119 DBUS_TYPE_STRING, &target,
120 DBUS_TYPE_STRING, &replace,
121 DBUS_TYPE_INVALID)) {
122 log_error("Could not attach target and flag information to signal message.");
126 if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
127 log_error("Failed to start unit: %s", error.message);
133 dbus_message_unref(m);
136 dbus_message_unref(reply);
138 dbus_error_free(&error);
141 static void request_process(Server *s, const struct init_request *req) {
145 if (req->magic != INIT_MAGIC) {
146 log_error("Got initctl request with invalid magic. Ignoring.");
152 case INIT_CMD_RUNLVL:
153 if (!isprint(req->runlevel))
154 log_error("Got invalid runlevel. Ignoring.");
156 change_runlevel(s, req->runlevel);
159 case INIT_CMD_POWERFAIL:
160 case INIT_CMD_POWERFAILNOW:
161 case INIT_CMD_POWEROK:
162 log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!");
165 case INIT_CMD_CHANGECONS:
166 log_warning("Received console change initctl request. This is not implemented in systemd.");
169 case INIT_CMD_SETENV:
170 case INIT_CMD_UNSETENV:
171 log_warning("Received environment initctl request. This is not implemented in systemd.");
175 log_warning("Received unknown initctl request. Ignoring.");
180 static int fifo_process(Fifo *f) {
186 if ((l = read(f->fd, ((uint8_t*) &f->buffer) + f->bytes_read, sizeof(f->buffer) - f->bytes_read)) <= 0) {
191 log_warning("Failed to read from fifo: %s", strerror(errno));
196 assert(f->bytes_read <= sizeof(f->buffer));
198 if (f->bytes_read == sizeof(f->buffer)) {
199 request_process(f->server, &f->buffer);
206 static void fifo_free(Fifo *f) {
210 assert(f->server->n_fifos > 0);
211 f->server->n_fifos--;
212 LIST_REMOVE(Fifo, fifo, f->server->fifos, f);
217 epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL);
219 close_nointr_nofail(f->fd);
225 static void server_done(Server *s) {
231 if (s->epoll_fd >= 0)
232 close_nointr_nofail(s->epoll_fd);
235 dbus_connection_close(s->bus);
236 dbus_connection_unref(s->bus);
240 static int server_init(Server *s, unsigned n_sockets) {
246 assert(n_sockets > 0);
248 dbus_error_init(&error);
252 if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) {
254 log_error("Failed to create epoll object: %s", strerror(errno));
258 for (i = 0; i < n_sockets; i++) {
259 struct epoll_event ev;
263 fd = SD_LISTEN_FDS_START+i;
265 if ((r = sd_is_fifo(fd, NULL)) < 0) {
266 log_error("Failed to determine file descriptor type: %s", strerror(-r));
271 log_error("Wrong file descriptor type.");
276 if (!(f = new0(Fifo, 1))) {
278 log_error("Failed to create fifo object: %s", strerror(errno));
287 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
290 log_error("Failed to add fifo fd to epoll object: %s", strerror(errno));
295 LIST_PREPEND(Fifo, fifo, s->fifos, f);
300 if (bus_connect(DBUS_BUS_SYSTEM, &s->bus, NULL, &error) < 0) {
301 log_error("Failed to get D-Bus connection: %s", error.message);
310 dbus_error_free(&error);
314 static int process_event(Server *s, struct epoll_event *ev) {
320 if (!(ev->events & EPOLLIN)) {
321 log_info("Got invalid event from epoll. (3)");
325 f = (Fifo*) ev->data.ptr;
327 if ((r = fifo_process(f)) < 0) {
328 log_info("Got error on fifo: %s", strerror(-r));
336 int main(int argc, char *argv[]) {
340 if (getppid() != 1) {
341 log_error("This program should be invoked by init only.");
346 log_error("This program does not take arguments.");
350 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
351 log_parse_environment();
353 log_info("systemd-initctl running as pid %lu", (unsigned long) getpid());
355 if ((n = sd_listen_fds(true)) < 0) {
356 log_error("Failed to read listening file descriptors from environment: %s", strerror(-r));
360 if (n <= 0 || n > SERVER_FD_MAX) {
361 log_error("No or too many file descriptors passed.");
365 if (server_init(&server, (unsigned) n) < 0)
370 "STATUS=Processing requests...");
373 struct epoll_event event;
376 if ((k = epoll_wait(server.epoll_fd,
383 log_error("epoll_wait() failed: %s", strerror(errno));
390 if ((k = process_event(&server, &event)) < 0)
397 "STATUS=Shutting down...");
399 server_done(&server);
401 log_info("systemd-initctl stopped as pid %lu", (unsigned long) getpid());