move all tools to subdirs

1 files changed, 476 insertions, 0 deletions

diff --git a/src/shutdownd/shutdownd.c b/src/shutdownd/shutdownd.c
new file mode 100644
index 0000000000..0497cd41a0
--- /dev/null
+++ b/src/shutdownd/shutdownd.c
@@ -0,0 +1,476 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  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
+  Lesser General Public License for more details.
+
+  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 <sys/socket.h>
+#include <sys/poll.h>
+#include <sys/types.h>
+#include <sys/timerfd.h>
+#include <assert.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stddef.h>
+
+#include <systemd/sd-daemon.h>
+#include <systemd/sd-shutdown.h>
+
+#include "log.h"
+#include "macro.h"
+#include "util.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, union shutdown_buffer *_b) {
+        struct msghdr msghdr;
+        struct iovec iovec;
+        struct ucred *ucred;
+        union {
+                struct cmsghdr cmsghdr;
+                uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
+        } control;
+        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(_b);
+
+        zero(iovec);
+        iovec.iov_base = &b;
+        iovec.iov_len = sizeof(b) - 1;
+
+        zero(control);
+        zero(msghdr);
+        msghdr.msg_iov = &iovec;
+        msghdr.msg_iovlen = 1;
+        msghdr.msg_control = &control;
+        msghdr.msg_controllen = sizeof(control);
+
+        n = recvmsg(fd, &msghdr, MSG_DONTWAIT);
+        if (n <= 0) {
+                if (n == 0) {
+                        log_error("Short read");
+                        return -EIO;
+                }
+
+                if (errno == EAGAIN || errno == EINTR)
+                        return 0;
+
+                log_error("recvmsg(): %m");
+                return -errno;
+        }
+
+        if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
+            control.cmsghdr.cmsg_level != SOL_SOCKET ||
+            control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
+            control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
+                log_warning("Received message without credentials. Ignoring.");
+                return 0;
+        }
+
+        ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
+        if (ucred->uid != 0) {
+                log_warning("Got request from unprivileged user. Ignoring.");
+                return 0;
+        }
+
+        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;
+        }
+
+        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_WALL_TIMER,
+                FD_NOLOGIN_TIMER,
+                FD_SHUTDOWN_TIMER,
+                _FD_MAX
+        };
+
+        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 EXIT_FAILURE;
+        }
+
+        if (argc > 1) {
+                log_error("This program does not take arguments.");
+                return EXIT_FAILURE;
+        }
+
+        log_set_target(LOG_TARGET_AUTO);
+        log_parse_environment();
+        log_open();
+
+        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 EXIT_FAILURE;
+        }
+
+        if (n_fds != 1) {
+                log_error("Need exactly one file descriptor.");
+                return EXIT_FAILURE;
+        }
+
+        zero(b);
+        zero(pollfd);
+
+        pollfd[FD_SOCKET].fd = SD_LISTEN_FDS_START;
+        pollfd[FD_SOCKET].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());
+
+        sd_notify(false,
+                  "READY=1\n"
+                  "STATUS=Processing requests...");
+
+        for (;;) {
+                int k;
+                usec_t n;
+
+                k = poll(pollfd, _FD_MAX, scheduled(&b.command) ? -1 : 0);
+                if (k < 0) {
+
+                        if (errno == EAGAIN || errno == EINTR)
+                                continue;
+
+                        log_error("poll(): %m");
+                        goto finish;
+                }
+
+                /* Exit on idle */
+                if (k == 0)
+                        break;
+
+                n = now(CLOCK_REALTIME);
+
+                if (pollfd[FD_SOCKET].revents) {
+
+                        k = read_packet(pollfd[FD_SOCKET].fd, &b);
+                        if (k < 0)
+                                goto finish;
+                        else if (k > 0) {
+                                struct itimerspec its;
+                                char date[FORMAT_TIMESTAMP_MAX];
+
+                                if (!scheduled(&b.command)) {
+                                        log_info("Shutdown canceled.");
+                                        break;
+                                }
+
+                                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, 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, b.command.usec);
+                                if (timerfd_settime(pollfd[FD_SHUTDOWN_TIMER].fd, TFD_TIMER_ABSTIME, &its, NULL) < 0) {
+                                        log_error("timerfd_settime(): %m");
+                                        goto finish;
+                                }
+
+                                update_schedule_file(&b.command);
+
+                                sd_notifyf(false,
+                                           "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].revents) {
+                        int 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;
+
+                        flush_fd(pollfd[FD_NOLOGIN_TIMER].fd);
+                }
+
+                if (pollfd[FD_SHUTDOWN_TIMER].revents) {
+                        exec_shutdown = true;
+                        goto finish;
+                }
+        }
+
+        r = EXIT_SUCCESS;
+
+        log_debug("systemd-shutdownd stopped as pid %lu", (unsigned long) getpid());
+
+finish:
+
+        for (i = 0; i < _FD_MAX; i++)
+                if (pollfd[i].fd >= 0)
+                        close_nointr_nofail(pollfd[i].fd);
+
+        if (unlink_nologin)
+                unlink("/run/nologin");
+
+        unlink("/run/systemd/shutdown/scheduled");
+
+        if (exec_shutdown && !b.command.dry_run) {
+                char sw[3];
+
+                sw[0] = '-';
+                sw[1] = b.command.mode;
+                sw[2] = 0;
+
+                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");
+        }
+
+        sd_notify(false,
+                  "STATUS=Exiting...");
+
+        return r;
+}