Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
+ You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
+#include <stddef.h>
+
+#include <systemd/sd-daemon.h>
+#include <systemd/sd-shutdown.h>
-#include "shutdownd.h"
#include "log.h"
#include "macro.h"
#include "util.h"
-#include "sd-daemon.h"
+#include "utmp-wtmp.h"
+#include "mkdir.h"
+
+union shutdown_buffer {
+ struct sd_shutdown_command command;
+ char space[offsetof(struct sd_shutdown_command, wall_message) + LINE_MAX];
+};
-static int read_packet(int fd, struct shutdownd_command *_c) {
+static int read_packet(int fd, union shutdown_buffer *_b) {
struct msghdr msghdr;
struct iovec iovec;
struct ucred *ucred;
struct cmsghdr cmsghdr;
uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
} control;
- struct shutdownd_command c;
ssize_t n;
+ union shutdown_buffer b; /* We maintain our own copy here, in order not to corrupt the last message */
assert(fd >= 0);
- assert(_c);
+ assert(_b);
zero(iovec);
- iovec.iov_base = &c;
- iovec.iov_len = sizeof(c);
+ iovec.iov_base = &b;
+ iovec.iov_len = sizeof(b) - 1;
zero(control);
zero(msghdr);
msghdr.msg_control = &control;
msghdr.msg_controllen = sizeof(control);
- if ((n = recvmsg(fd, &msghdr, MSG_DONTWAIT)) <= 0) {
- if (n >= 0) {
+ n = recvmsg(fd, &msghdr, MSG_DONTWAIT);
+ if (n <= 0) {
+ if (n == 0) {
log_error("Short read");
return -EIO;
}
return 0;
}
- if (n != sizeof(c)) {
- log_warning("Message has invaliud size. Ignoring");
+ if ((size_t) n < offsetof(struct sd_shutdown_command, wall_message)) {
+ log_warning("Message has invalid size. Ignoring.");
+ return 0;
+ }
+
+ if (b.command.mode != SD_SHUTDOWN_NONE &&
+ b.command.mode != SD_SHUTDOWN_REBOOT &&
+ b.command.mode != SD_SHUTDOWN_POWEROFF &&
+ b.command.mode != SD_SHUTDOWN_HALT &&
+ b.command.mode != SD_SHUTDOWN_KEXEC) {
+ log_warning("Message has invalid mode. Ignoring.");
return 0;
}
- *_c = c;
+ b.space[n] = 0;
+
+ *_b = b;
return 1;
}
+static void warn_wall(usec_t n, struct sd_shutdown_command *c) {
+ char date[FORMAT_TIMESTAMP_MAX];
+ const char *prefix;
+ char *l = NULL;
+
+ assert(c);
+ assert(c->warn_wall);
+
+ if (n >= c->usec)
+ return;
+
+ if (c->mode == SD_SHUTDOWN_HALT)
+ prefix = "The system is going down for system halt at ";
+ else if (c->mode == SD_SHUTDOWN_POWEROFF)
+ prefix = "The system is going down for power-off at ";
+ else if (c->mode == SD_SHUTDOWN_REBOOT)
+ prefix = "The system is going down for reboot at ";
+ else if (c->mode == SD_SHUTDOWN_KEXEC)
+ prefix = "The system is going down for kexec reboot at ";
+ else
+ assert_not_reached("Unknown mode!");
+
+ if (asprintf(&l, "%s%s%s%s!", c->wall_message, c->wall_message[0] ? "\n" : "",
+ prefix, format_timestamp(date, sizeof(date), c->usec)) < 0)
+ log_error("Failed to allocate wall message");
+ else {
+ utmp_wall(l, NULL);
+ free(l);
+ }
+}
+
+static usec_t when_wall(usec_t n, usec_t elapse) {
+
+ static const struct {
+ usec_t delay;
+ usec_t interval;
+ } table[] = {
+ { 10 * USEC_PER_MINUTE, USEC_PER_MINUTE },
+ { USEC_PER_HOUR, 15 * USEC_PER_MINUTE },
+ { 3 * USEC_PER_HOUR, 30 * USEC_PER_MINUTE }
+ };
+
+ usec_t left, sub;
+ unsigned i;
+
+ /* If the time is already passed, then don't announce */
+ if (n >= elapse)
+ return 0;
+
+ left = elapse - n;
+ for (i = 0; i < ELEMENTSOF(table); i++)
+ if (n + table[i].delay >= elapse) {
+ sub = ((left / table[i].interval) * table[i].interval);
+ break;
+ }
+
+ if (i >= ELEMENTSOF(table))
+ sub = ((left / USEC_PER_HOUR) * USEC_PER_HOUR);
+
+ return elapse > sub ? elapse - sub : 1;
+}
+
+static usec_t when_nologin(usec_t elapse) {
+ return elapse > 5*USEC_PER_MINUTE ? elapse - 5*USEC_PER_MINUTE : 1;
+}
+
+static const char *mode_to_string(enum sd_shutdown_mode m) {
+ switch (m) {
+ case SD_SHUTDOWN_REBOOT:
+ return "reboot";
+ case SD_SHUTDOWN_POWEROFF:
+ return "poweroff";
+ case SD_SHUTDOWN_HALT:
+ return "halt";
+ case SD_SHUTDOWN_KEXEC:
+ return "kexec";
+ default:
+ return NULL;
+ }
+}
+
+static int update_schedule_file(struct sd_shutdown_command *c) {
+ int r;
+ FILE *f;
+ char *temp_path, *t;
+
+ assert(c);
+
+ r = safe_mkdir("/run/systemd/shutdown", 0755, 0, 0);
+ if (r < 0) {
+ log_error("Failed to create shutdown subdirectory: %s", strerror(-r));
+ return r;
+ }
+
+ t = cescape(c->wall_message);
+ if (!t) {
+ log_error("Out of memory");
+ return -ENOMEM;
+ }
+
+ r = fopen_temporary("/run/systemd/shutdown/scheduled", &f, &temp_path);
+ if (r < 0) {
+ log_error("Failed to save information about scheduled shutdowns: %s", strerror(-r));
+ free(t);
+ return r;
+ }
+
+ fchmod(fileno(f), 0644);
+
+ fprintf(f,
+ "USEC=%llu\n"
+ "WARN_WALL=%i\n"
+ "MODE=%s\n",
+ (unsigned long long) c->usec,
+ c->warn_wall,
+ mode_to_string(c->mode));
+
+ if (c->dry_run)
+ fputs("DRY_RUN=1\n", f);
+
+ if (!isempty(t))
+ fprintf(f, "WALL_MESSAGE=%s\n", t);
+
+ free(t);
+
+ fflush(f);
+
+ if (ferror(f) || rename(temp_path, "/run/systemd/shutdown/scheduled") < 0) {
+ log_error("Failed to write information about scheduled shutdowns: %m");
+ r = -errno;
+
+ unlink(temp_path);
+ unlink("/run/systemd/shutdown/scheduled");
+ }
+
+ fclose(f);
+ free(temp_path);
+
+ return r;
+}
+
+static bool scheduled(struct sd_shutdown_command *c) {
+ return c->usec > 0 && c->mode != SD_SHUTDOWN_NONE;
+}
+
int main(int argc, char *argv[]) {
enum {
FD_SOCKET,
- FD_SHUTDOWN_TIMER,
+ FD_WALL_TIMER,
FD_NOLOGIN_TIMER,
+ FD_SHUTDOWN_TIMER,
_FD_MAX
};
- int r = 4, n;
- int one = 1;
- unsigned n_fds = 1;
- struct shutdownd_command c;
+ int r = EXIT_FAILURE, n_fds;
+ union shutdown_buffer b;
struct pollfd pollfd[_FD_MAX];
bool exec_shutdown = false, unlink_nologin = false;
+ unsigned i;
if (getppid() != 1) {
log_error("This program should be invoked by init only.");
- return 1;
+ return EXIT_FAILURE;
}
if (argc > 1) {
log_error("This program does not take arguments.");
- return 1;
+ return EXIT_FAILURE;
}
- log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
+ log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
+ log_open();
- if ((n = sd_listen_fds(true)) < 0) {
+ umask(0022);
+
+ n_fds = sd_listen_fds(true);
+ if (n_fds < 0) {
log_error("Failed to read listening file descriptors from environment: %s", strerror(-r));
- return 1;
+ return EXIT_FAILURE;
}
- if (n != 1) {
+ if (n_fds != 1) {
log_error("Need exactly one file descriptor.");
- return 2;
+ return EXIT_FAILURE;
}
- if (setsockopt(SD_LISTEN_FDS_START, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
- log_error("SO_PASSCRED failed: %m");
- return 3;
- }
-
- zero(c);
+ zero(b);
zero(pollfd);
pollfd[FD_SOCKET].fd = SD_LISTEN_FDS_START;
pollfd[FD_SOCKET].events = POLLIN;
- pollfd[FD_SHUTDOWN_TIMER].fd = -1;
- pollfd[FD_SHUTDOWN_TIMER].events = POLLIN;
- pollfd[FD_NOLOGIN_TIMER].fd = -1;
- pollfd[FD_NOLOGIN_TIMER].events = POLLIN;
+
+ for (i = FD_WALL_TIMER; i < _FD_MAX; i++) {
+ pollfd[i].events = POLLIN;
+ pollfd[i].fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC);
+ if (pollfd[i].fd < 0) {
+ log_error("timerfd_create(): %m");
+ goto finish;
+ }
+ }
log_debug("systemd-shutdownd running as pid %lu", (unsigned long) getpid());
"READY=1\n"
"STATUS=Processing requests...");
- do {
+ for (;;) {
int k;
+ usec_t n;
- if (poll(pollfd, n_fds, -1) < 0) {
+ k = poll(pollfd, _FD_MAX, scheduled(&b.command) ? -1 : 0);
+ if (k < 0) {
if (errno == EAGAIN || errno == EINTR)
continue;
goto finish;
}
+ /* Exit on idle */
+ if (k == 0)
+ break;
+
+ n = now(CLOCK_REALTIME);
+
if (pollfd[FD_SOCKET].revents) {
- if ((k = read_packet(pollfd[FD_SOCKET].fd, &c)) < 0)
+ k = read_packet(pollfd[FD_SOCKET].fd, &b);
+ if (k < 0)
goto finish;
- else if (k > 0 && c.elapse > 0) {
+ else if (k > 0) {
struct itimerspec its;
- char buf[27];
+ char date[FORMAT_TIMESTAMP_MAX];
- if (pollfd[FD_SHUTDOWN_TIMER].fd < 0)
- if ((pollfd[FD_SHUTDOWN_TIMER].fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC)) < 0) {
- log_error("timerfd_create(): %m");
- goto finish;
- }
+ if (!scheduled(&b.command)) {
+ log_info("Shutdown canceled.");
+ break;
+ }
- if (pollfd[FD_NOLOGIN_TIMER].fd < 0)
- if ((pollfd[FD_NOLOGIN_TIMER].fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC)) < 0) {
- log_error("timerfd_create(): %m");
- goto finish;
- }
+ zero(its);
+ if (b.command.warn_wall) {
+ /* Send wall messages every so often */
+ timespec_store(&its.it_value, when_wall(n, b.command.usec));
+
+ /* Warn immediately if less than 15 minutes are left */
+ if (n < b.command.usec &&
+ n + 15*USEC_PER_MINUTE >= b.command.usec)
+ warn_wall(n, &b.command);
+ }
+ if (timerfd_settime(pollfd[FD_WALL_TIMER].fd, TFD_TIMER_ABSTIME, &its, NULL) < 0) {
+ log_error("timerfd_settime(): %m");
+ goto finish;
+ }
/* Disallow logins 5 minutes prior to shutdown */
zero(its);
- timespec_store(&its.it_value, c.elapse > 5*USEC_PER_MINUTE ? c.elapse - 5*USEC_PER_MINUTE : 0);
+ timespec_store(&its.it_value, when_nologin(b.command.usec));
if (timerfd_settime(pollfd[FD_NOLOGIN_TIMER].fd, TFD_TIMER_ABSTIME, &its, NULL) < 0) {
log_error("timerfd_settime(): %m");
goto finish;
/* Shutdown after the specified time is reached */
zero(its);
- timespec_store(&its.it_value, c.elapse);
+ timespec_store(&its.it_value, b.command.usec);
if (timerfd_settime(pollfd[FD_SHUTDOWN_TIMER].fd, TFD_TIMER_ABSTIME, &its, NULL) < 0) {
log_error("timerfd_settime(): %m");
goto finish;
}
- n_fds = 3;
-
- ctime_r(&its.it_value.tv_sec, buf);
+ update_schedule_file(&b.command);
sd_notifyf(false,
- "STATUS=Shutting down at %s...",
- strstrip(buf));
+ "STATUS=Shutting down at %s (%s)...",
+ format_timestamp(date, sizeof(date), b.command.usec),
+ mode_to_string(b.command.mode));
+
+ log_info("Shutting down at %s (%s)...", date, mode_to_string(b.command.mode));
+ }
+ }
+
+ if (pollfd[FD_WALL_TIMER].revents) {
+ struct itimerspec its;
+
+ warn_wall(n, &b.command);
+ flush_fd(pollfd[FD_WALL_TIMER].fd);
+
+ /* Restart timer */
+ zero(its);
+ timespec_store(&its.it_value, when_wall(n, b.command.usec));
+ if (timerfd_settime(pollfd[FD_WALL_TIMER].fd, TFD_TIMER_ABSTIME, &its, NULL) < 0) {
+ log_error("timerfd_settime(): %m");
+ goto finish;
}
}
- if (pollfd[FD_NOLOGIN_TIMER].fd >= 0 &&
- pollfd[FD_NOLOGIN_TIMER].revents) {
+ if (pollfd[FD_NOLOGIN_TIMER].revents) {
int e;
- if ((e = touch("/etc/nologin")) < 0)
- log_error("Failed to create /etc/nologin: %s", strerror(-e));
+ log_info("Creating /run/nologin, blocking further logins...");
+
+ e = write_one_line_file_atomic("/run/nologin", "System is going down.");
+ if (e < 0)
+ log_error("Failed to create /run/nologin: %s", strerror(-e));
else
unlink_nologin = true;
- /* Disarm nologin timer */
- close_nointr_nofail(pollfd[FD_NOLOGIN_TIMER].fd);
- pollfd[FD_NOLOGIN_TIMER].fd = -1;
- n_fds = 2;
-
+ flush_fd(pollfd[FD_NOLOGIN_TIMER].fd);
}
- if (pollfd[FD_SHUTDOWN_TIMER].fd >= 0 &&
- pollfd[FD_SHUTDOWN_TIMER].revents) {
+ if (pollfd[FD_SHUTDOWN_TIMER].revents) {
exec_shutdown = true;
goto finish;
}
+ }
- } while (c.elapse > 0);
-
- r = 0;
+ r = EXIT_SUCCESS;
log_debug("systemd-shutdownd stopped as pid %lu", (unsigned long) getpid());
finish:
- if (pollfd[FD_SOCKET].fd >= 0)
- close_nointr_nofail(pollfd[FD_SOCKET].fd);
- if (pollfd[FD_SHUTDOWN_TIMER].fd >= 0)
- close_nointr_nofail(pollfd[FD_SHUTDOWN_TIMER].fd);
+ for (i = 0; i < _FD_MAX; i++)
+ if (pollfd[i].fd >= 0)
+ close_nointr_nofail(pollfd[i].fd);
- if (pollfd[FD_NOLOGIN_TIMER].fd >= 0)
- close_nointr_nofail(pollfd[FD_NOLOGIN_TIMER].fd);
+ if (unlink_nologin)
+ unlink("/run/nologin");
+
+ unlink("/run/systemd/shutdown/scheduled");
- if (exec_shutdown) {
+ if (exec_shutdown && !b.command.dry_run) {
char sw[3];
sw[0] = '-';
- sw[1] = c.mode;
+ sw[1] = b.command.mode;
sw[2] = 0;
- execl(SYSTEMCTL_BINARY_PATH, "shutdown", sw, "now", NULL);
+ execl(SYSTEMCTL_BINARY_PATH,
+ "shutdown",
+ sw,
+ "now",
+ (b.command.warn_wall && b.command.wall_message[0]) ? b.command.wall_message :
+ (b.command.warn_wall ? NULL : "--no-wall"),
+ NULL);
+
log_error("Failed to execute /sbin/shutdown: %m");
}
- if (unlink_nologin)
- unlink("/etc/nologin");
-
sd_notify(false,
"STATUS=Exiting...");
~ianmdlvl / elogind.git / blobdiff