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Diffstat (limited to 'src/openrc-shutdown/openrc-shutdown.c')
-rw-r--r--src/openrc-shutdown/openrc-shutdown.c358
1 files changed, 358 insertions, 0 deletions
diff --git a/src/openrc-shutdown/openrc-shutdown.c b/src/openrc-shutdown/openrc-shutdown.c
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+++ b/src/openrc-shutdown/openrc-shutdown.c
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+/*
+ * openrc-shutdown.c
+ * If you are using OpenRC's provided init, this will shut down or
+ * reboot your system.
+ *
+ * This is based on code written by James Hammons <jlhamm@acm.org>, so
+ * I would like to publically thank him for his work.
+ */
+
+/*
+ * Copyright 2017 The OpenRC Authors.
+ * See the Authors file at the top-level directory of this distribution and
+ * https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS
+ *
+ * This file is part of OpenRC. It is subject to the license terms in
+ * the LICENSE file found in the top-level directory of this
+ * distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE
+ * This file may not be copied, modified, propagated, or distributed
+ * except according to the terms contained in the LICENSE file.
+ */
+
+#include <getopt.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/utsname.h>
+
+#include "broadcast.h"
+#include "einfo.h"
+#include "rc.h"
+#include "helpers.h"
+#include "misc.h"
+#include "rc-sysvinit.h"
+#include "wtmp.h"
+#include "_usage.h"
+
+const char *applet = NULL;
+const char *extraopts = NULL;
+const char getoptstring[] = "cdDfFHKpRrsw" getoptstring_COMMON;
+const struct option longopts[] = {
+ { "cancel", no_argument, NULL, 'c'},
+ { "no-write", no_argument, NULL, 'd'},
+ { "dry-run", no_argument, NULL, 'D'},
+ { "halt", no_argument, NULL, 'H'},
+ { "kexec", no_argument, NULL, 'K'},
+ { "poweroff", no_argument, NULL, 'p'},
+ { "reexec", no_argument, NULL, 'R'},
+ { "reboot", no_argument, NULL, 'r'},
+ { "single", no_argument, NULL, 's'},
+ { "write-only", no_argument, NULL, 'w'},
+ longopts_COMMON
+};
+const char * const longopts_help[] = {
+ "cancel a pending shutdown",
+ "do not write wtmp record",
+ "print actions instead of executing them",
+ "halt the system",
+ "reboot the system using kexec",
+ "power off the system",
+ "re-execute init (use after upgrading)",
+ "reboot the system",
+ "single user mode",
+ "write wtmp boot record and exit",
+ longopts_help_COMMON
+};
+const char *usagestring = "" \
+ "Usage: openrc-shutdown -c | --cancel\n" \
+ " or: openrc-shutdown -R | --reexec\n" \
+ " or: openrc-shutdown -w | --write-only\n" \
+ " or: openrc-shutdown -H | --halt time\n" \
+ " or: openrc-shutdown -K | --kexec time\n" \
+ " or: openrc-shutdown -p | --poweroff time\n" \
+ " or: openrc-shutdown -r | --reboot time\n" \
+ " or: openrc-shutdown -s | --single time";
+const char *exclusive = "Select one of "
+ "--cancel, --halt, --kexec, --poweroff, --reexec, --reboot, --single or \n"
+ "--write-only";
+const char *nologin_file = RC_SYSCONFDIR"/nologin";
+const char *shutdown_pid = "/run/openrc-shutdown.pid";
+
+static bool do_cancel = false;
+static bool do_dryrun = false;
+static bool do_halt = false;
+static bool do_kexec = false;
+static bool do_poweroff = false;
+static bool do_reboot = false;
+static bool do_reexec = false;
+static bool do_single = false;
+static bool do_wtmp = true;
+static bool do_wtmp_only = false;
+
+static void cancel_shutdown(void)
+{
+ pid_t pid;
+
+ pid = get_pid(applet, shutdown_pid);
+ if (pid <= 0)
+ eerrorx("%s: Unable to cancel shutdown", applet);
+
+ if (kill(pid, SIGTERM) != -1)
+ einfo("%s: shutdown canceled", applet);
+ else
+ eerrorx("%s: Unable to cancel shutdown", applet);
+}
+
+/*
+ * Create the nologin file.
+ */
+static void create_nologin(int mins)
+{
+ FILE *fp;
+ time_t t;
+
+ time(&t);
+ t += 60 * mins;
+
+ if ((fp = fopen(nologin_file, "w")) != NULL) {
+ fprintf(fp, "\rThe system is going down on %s\r\n", ctime(&t));
+ fclose(fp);
+ }
+}
+
+/*
+ * Send a command to our init
+ */
+static void send_cmd(const char *cmd)
+{
+ FILE *fifo;
+ size_t ignored;
+
+ if (do_dryrun) {
+ einfo("Would send %s to init", cmd);
+ return;
+ }
+ if (do_wtmp && (do_halt || do_kexec || do_reboot || do_poweroff))
+ log_wtmp("shutdown", "~~", 0, RUN_LVL, "~~");
+ fifo = fopen(RC_INIT_FIFO, "w");
+ if (!fifo) {
+ perror("fopen");
+ return;
+ }
+
+ ignored = fwrite(cmd, 1, strlen(cmd), fifo);
+ if (ignored != strlen(cmd))
+ printf("Error writing to init fifo\n");
+ fclose(fifo);
+}
+
+/*
+ * sleep without being interrupted.
+ * The idea for this code came from sysvinit.
+ */
+static void sleep_no_interrupt(int seconds)
+{
+ struct timespec duration;
+ struct timespec remaining;
+
+ duration.tv_sec = seconds;
+ duration.tv_nsec = 0;
+
+ while (nanosleep(&duration, &remaining) < 0 && errno == EINTR)
+ duration = remaining;
+}
+
+static void stop_shutdown(int sig)
+{
+ (void) sig;
+ unlink(nologin_file);
+ unlink(shutdown_pid);
+einfo("Shutdown canceled");
+exit(0);
+}
+
+int main(int argc, char **argv)
+{
+ char *ch = NULL;
+ int opt;
+ int cmd_count = 0;
+ int hour = 0;
+ int min = 0;
+ int shutdown_delay = 0;
+ struct sigaction sa;
+ struct tm *lt;
+ time_t tv;
+ bool need_warning = false;
+ char *msg = NULL;
+ char *state = NULL;
+ char *time_arg = NULL;
+ FILE *fp;
+
+ applet = basename_c(argv[0]);
+ while ((opt = getopt_long(argc, argv, getoptstring,
+ longopts, (int *) 0)) != -1)
+ {
+ switch (opt) {
+ case 'c':
+ do_cancel = true;
+ cmd_count++;
+ break;
+ case 'd':
+ do_wtmp = false;
+ break;
+ case 'D':
+ do_dryrun = true;
+ break;
+ case 'H':
+ do_halt = true;
+ xasprintf(&state, "%s", "halt");
+ cmd_count++;
+ break;
+ case 'K':
+ do_kexec = true;
+ xasprintf(&state, "%s", "reboot");
+ cmd_count++;
+ break;
+ case 'p':
+ do_poweroff = true;
+ xasprintf(&state, "%s", "power off");
+ cmd_count++;
+ break;
+ case 'R':
+ do_reexec = true;
+ cmd_count++;
+ break;
+ case 'r':
+ do_reboot = true;
+ xasprintf(&state, "%s", "reboot");
+ cmd_count++;
+ break;
+ case 's':
+ do_single = true;
+ xasprintf(&state, "%s", "go down for maintenance");
+ cmd_count++;
+ break;
+ case 'w':
+ do_wtmp_only = true;
+ cmd_count++;
+ break;
+ case_RC_COMMON_GETOPT
+ }
+ }
+ if (geteuid() != 0)
+ eerrorx("%s: you must be root\n", applet);
+ if (cmd_count != 1) {
+ eerror("%s: %s\n", applet, exclusive);
+ usage(EXIT_FAILURE);
+ }
+
+ if (do_cancel) {
+ cancel_shutdown();
+ exit(EXIT_SUCCESS);
+ } else if (do_reexec) {
+ send_cmd("reexec");
+ exit(EXIT_SUCCESS);
+ } else if (do_wtmp_only) {
+ log_wtmp("shutdown", "~~", 0, RUN_LVL, "~~");
+ exit(EXIT_SUCCESS);
+ }
+
+ if (optind >= argc) {
+ eerror("%s: No shutdown time specified", applet);
+ usage(EXIT_FAILURE);
+ }
+ time_arg = argv[optind];
+ if (*time_arg == '+')
+ time_arg++;
+ if (strcasecmp(time_arg, "now") == 0)
+ strcpy(time_arg, "0");
+ for (ch=time_arg; *ch; ch++)
+ if ((*ch < '0' || *ch > '9') && *ch != ':') {
+ eerror("%s: invalid time %s", applet, time_arg);
+ usage(EXIT_FAILURE);
+ }
+ if (strchr(time_arg, ':')) {
+ if ((sscanf(time_arg, "%2d:%2d", &hour, &min) != 2) ||
+ (hour > 23) || (min > 59)) {
+ eerror("%s: invalid time %s", applet, time_arg);
+ usage(EXIT_FAILURE);
+ }
+ time(&tv);
+ lt = localtime(&tv);
+ shutdown_delay = (hour * 60 + min) - (lt->tm_hour * 60 + lt->tm_min);
+ if (shutdown_delay < 0)
+ shutdown_delay += 1440;
+ } else {
+ shutdown_delay = atoi(time_arg);
+ }
+
+ fp = fopen(shutdown_pid, "w");
+ if (!fp)
+ eerrorx("%s: fopen `%s': %s", applet, shutdown_pid, strerror(errno));
+ fprintf(fp, "%d\n", getpid());
+ fclose(fp);
+
+ openlog(applet, LOG_PID, LOG_DAEMON);
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_handler = stop_shutdown;
+ sigemptyset(&sa.sa_mask);
+ sigaction(SIGINT, &sa, NULL);
+ sigaction(SIGTERM, &sa, NULL);
+ while (shutdown_delay > 0) {
+ need_warning = false;
+ if (shutdown_delay > 180)
+ need_warning = (shutdown_delay % 60 == 0);
+ else if (shutdown_delay > 60)
+ need_warning = (shutdown_delay % 30 == 0);
+ else if (shutdown_delay > 10)
+ need_warning = (shutdown_delay % 15 == 0);
+ else
+ need_warning = true;
+ if (shutdown_delay <= 5)
+ create_nologin(shutdown_delay);
+ if (need_warning) {
+ xasprintf(&msg, "\rThe system will %s in %d minutes\r\n",
+ state, shutdown_delay);
+ broadcast(msg);
+ free(msg);
+ }
+ sleep_no_interrupt(60);
+ shutdown_delay--;
+ }
+ xasprintf(&msg, "\rThe system will %s now\r\n", state);
+ broadcast(msg);
+ syslog(LOG_NOTICE, "The system will %s now", state);
+ unlink(nologin_file);
+ unlink(shutdown_pid);
+ if (do_halt) {
+ if (exists("/run/initctl")) {
+ sysvinit_setenv("INIT_HALT", "HALT");
+ sysvinit_runlevel('0');
+ } else
+ send_cmd("halt");
+ } else if (do_kexec)
+ send_cmd("kexec");
+ else if (do_poweroff) {
+ if (exists("/run/initctl")) {
+ sysvinit_setenv("INIT_HALT", "POWEROFF");
+ sysvinit_runlevel('0');
+ } else
+ send_cmd("poweroff");
+ } else if (do_reboot) {
+ if (exists("/run/initctl"))
+ sysvinit_runlevel('6');
+ else
+ send_cmd("reboot");
+ } else if (do_single) {
+ if (exists("/run/initctl"))
+ sysvinit_runlevel('S');
+ else
+ send_cmd("single");
+ }
+ return 0;
+}
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