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>
44 #define SERVER_FD_START 3
45 #define SERVER_FD_MAX 16
46 #define TIMEOUT ((int) (10*MSEC_PER_SEC))
48 typedef struct Fifo Fifo;
50 typedef struct Server {
53 LIST_HEAD(Fifo, fifos);
64 struct init_request buffer;
67 LIST_FIELDS(Fifo, fifo);
70 static const char *translate_runlevel(int runlevel) {
75 { '0', SPECIAL_RUNLEVEL0_TARGET },
76 { '1', SPECIAL_RUNLEVEL1_TARGET },
77 { 's', SPECIAL_RUNLEVEL1_TARGET },
78 { 'S', SPECIAL_RUNLEVEL1_TARGET },
79 { '2', SPECIAL_RUNLEVEL2_TARGET },
80 { '3', SPECIAL_RUNLEVEL3_TARGET },
81 { '4', SPECIAL_RUNLEVEL4_TARGET },
82 { '5', SPECIAL_RUNLEVEL5_TARGET },
83 { '6', SPECIAL_RUNLEVEL6_TARGET },
88 for (i = 0; i < ELEMENTSOF(table); i++)
89 if (table[i].runlevel == runlevel)
90 return table[i].special;
95 static void change_runlevel(Server *s, int runlevel) {
97 DBusMessage *m = NULL, *reply = NULL;
99 const char *path, *replace = "isolate";
103 dbus_error_init(&error);
105 if (!(target = translate_runlevel(runlevel))) {
106 log_warning("Got request for unknown runlevel %c, ignoring.", runlevel);
110 log_debug("Running request %s", target);
112 if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "LoadUnit"))) {
113 log_error("Could not allocate message.");
117 if (!dbus_message_append_args(m,
118 DBUS_TYPE_STRING, &target,
119 DBUS_TYPE_INVALID)) {
120 log_error("Could not attach group information to signal message.");
124 if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
125 log_error("Failed to get unit path: %s", error.message);
129 if (!dbus_message_get_args(reply, &error,
130 DBUS_TYPE_OBJECT_PATH, &path,
131 DBUS_TYPE_INVALID)) {
132 log_error("Failed to parse unit path: %s", error.message);
136 dbus_message_unref(m);
137 if (!(m = dbus_message_new_method_call("org.freedesktop.systemd1", path, "org.freedesktop.systemd1.Unit", "Start"))) {
138 log_error("Could not allocate message.");
142 if (!dbus_message_append_args(m,
143 DBUS_TYPE_STRING, &replace,
144 DBUS_TYPE_INVALID)) {
145 log_error("Could not attach group information to signal message.");
149 dbus_message_unref(reply);
150 if (!(reply = dbus_connection_send_with_reply_and_block(s->bus, m, -1, &error))) {
151 log_error("Failed to start unit: %s", error.message);
157 dbus_message_unref(m);
160 dbus_message_unref(reply);
162 dbus_error_free(&error);
165 static void request_process(Server *s, const struct init_request *req) {
169 if (req->magic != INIT_MAGIC) {
170 log_error("Got initctl request with invalid magic. Ignoring.");
176 case INIT_CMD_RUNLVL:
177 if (!isprint(req->runlevel))
178 log_error("Got invalid runlevel. Ignoring.");
180 change_runlevel(s, req->runlevel);
183 case INIT_CMD_POWERFAIL:
184 case INIT_CMD_POWERFAILNOW:
185 case INIT_CMD_POWEROK:
186 log_warning("Received UPS/power initctl request. This is not implemented in systemd. Upgrade your UPS daemon!");
189 case INIT_CMD_CHANGECONS:
190 log_warning("Received console change initctl request. This is not implemented in systemd.");
193 case INIT_CMD_SETENV:
194 case INIT_CMD_UNSETENV:
195 log_warning("Received environment initctl request. This is not implemented in systemd.");
199 log_warning("Received unknown initctl request. Ignoring.");
204 static int fifo_process(Fifo *f) {
210 if ((l = read(f->fd, ((uint8_t*) &f->buffer) + f->bytes_read, sizeof(f->buffer) - f->bytes_read)) <= 0) {
215 log_warning("Failed to read from fifo: %s", strerror(errno));
220 assert(f->bytes_read <= sizeof(f->buffer));
222 if (f->bytes_read == sizeof(f->buffer)) {
223 request_process(f->server, &f->buffer);
230 static void fifo_free(Fifo *f) {
234 assert(f->server->n_fifos > 0);
235 f->server->n_fifos--;
236 LIST_REMOVE(Fifo, fifo, f->server->fifos, f);
241 epoll_ctl(f->server->epoll_fd, EPOLL_CTL_DEL, f->fd, NULL);
243 close_nointr_nofail(f->fd);
249 static int verify_environment(unsigned *n_sockets) {
250 unsigned long long pid;
255 assert_se(n_sockets);
257 if (!(e = getenv("LISTEN_PID"))) {
258 log_error("Missing $LISTEN_PID environment variable.");
262 if ((r = safe_atollu(e, &pid)) < 0) {
263 log_error("Failed to parse $LISTEN_PID: %s", strerror(-r));
267 if (pid != (unsigned long long) getpid()) {
268 log_error("Socket nor for me.");
272 if (!(e = getenv("LISTEN_FDS"))) {
273 log_error("Missing $LISTEN_FDS environment variable.");
277 if ((r = safe_atou(e, &ns)) < 0) {
278 log_error("Failed to parse $LISTEN_FDS: %s", strerror(-r));
282 if (ns <= 0 || ns > SERVER_FD_MAX) {
283 log_error("Wrong number of file descriptors passed: %s", e);
292 static void server_done(Server *s) {
298 if (s->epoll_fd >= 0)
299 close_nointr_nofail(s->epoll_fd);
302 dbus_connection_unref(s->bus);
305 static int server_init(Server *s, unsigned n_sockets) {
311 assert(n_sockets > 0);
313 dbus_error_init(&error);
317 if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) {
319 log_error("Failed to create epoll object: %s", strerror(errno));
323 for (i = 0; i < n_sockets; i++) {
324 struct epoll_event ev;
327 if (!(f = new0(Fifo, 1))) {
329 log_error("Failed to create fifo object: %s", strerror(errno));
338 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, SERVER_FD_START+i, &ev) < 0) {
341 log_error("Failed to add fifo fd to epoll object: %s", strerror(errno));
345 f->fd = SERVER_FD_START+i;
346 LIST_PREPEND(Fifo, fifo, s->fifos, f);
351 if (!(s->bus = dbus_bus_get(DBUS_BUS_SYSTEM, &error))) {
352 log_error("Failed to get D-Bus connection: %s", error.message);
361 dbus_error_free(&error);
365 static int process_event(Server *s, struct epoll_event *ev) {
371 if (!(ev->events & EPOLLIN)) {
372 log_info("Got invalid event from epoll. (3)");
376 f = (Fifo*) ev->data.ptr;
378 if ((r = fifo_process(f)) < 0) {
379 log_info("Got error on fifo: %s", strerror(-r));
387 int main(int argc, char *argv[]) {
392 log_info("systemd-initctl running as pid %llu", (unsigned long long) getpid());
394 if (verify_environment(&n) < 0)
397 if (server_init(&server, n) < 0)
401 struct epoll_event event;
404 if ((k = epoll_wait(server.epoll_fd,
411 log_error("epoll_wait() failed: %s", strerror(errno));
418 if ((k = process_event(&server, &event)) < 0)
424 server_done(&server);
426 log_info("systemd-initctl stopped as pid %llu", (unsigned long long) getpid());