5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
424 lines
13 KiB
C
424 lines
13 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <assert.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <dbus/dbus.h>
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#ifdef HAVE_AUDIT
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#include <libaudit.h>
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#endif
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#include "log.h"
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#include "macro.h"
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#include "util.h"
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#include "special.h"
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#include "utmp-wtmp.h"
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#include "dbus-common.h"
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typedef struct Context {
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DBusConnection *bus;
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#ifdef HAVE_AUDIT
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int audit_fd;
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#endif
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} Context;
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static usec_t get_startup_time(Context *c) {
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const char
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*interface = "org.freedesktop.systemd1.Manager",
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*property = "StartupTimestamp";
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DBusError error;
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usec_t t = 0;
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DBusMessage *m = NULL, *reply = NULL;
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DBusMessageIter iter, sub;
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dbus_error_init(&error);
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assert(c);
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.DBus.Properties",
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"Get"))) {
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log_error("Could not allocate message.");
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, &interface,
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DBUS_TYPE_STRING, &property,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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goto finish;
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}
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if (!(reply = dbus_connection_send_with_reply_and_block(c->bus, m, -1, &error))) {
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log_error("Failed to send command: %s", bus_error_message(&error));
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goto finish;
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}
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if (!dbus_message_iter_init(reply, &iter) ||
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dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT) {
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log_error("Failed to parse reply.");
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goto finish;
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}
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dbus_message_iter_recurse(&iter, &sub);
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if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_UINT64) {
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log_error("Failed to parse reply.");
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goto finish;
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}
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dbus_message_iter_get_basic(&sub, &t);
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finish:
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if (m)
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dbus_message_unref(m);
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if (reply)
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dbus_message_unref(reply);
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dbus_error_free(&error);
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return t;
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}
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static int get_current_runlevel(Context *c) {
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static const struct {
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const int runlevel;
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const char *special;
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} table[] = {
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/* The first target of this list that is active or has
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* a job scheduled wins. We prefer runlevels 5 and 3
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* here over the others, since these are the main
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* runlevels used on Fedora. It might make sense to
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* change the order on some distributions. */
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{ '5', SPECIAL_RUNLEVEL5_TARGET },
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{ '3', SPECIAL_RUNLEVEL3_TARGET },
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{ '4', SPECIAL_RUNLEVEL4_TARGET },
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{ '2', SPECIAL_RUNLEVEL2_TARGET },
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{ 'S', SPECIAL_RESCUE_TARGET },
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};
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const char
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*interface = "org.freedesktop.systemd1.Unit",
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*property = "ActiveState";
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DBusMessage *m = NULL, *reply = NULL;
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int r = 0;
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unsigned i;
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DBusError error;
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assert(c);
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dbus_error_init(&error);
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for (i = 0; i < ELEMENTSOF(table); i++) {
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const char *path = NULL, *state;
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DBusMessageIter iter, sub;
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"GetUnit"))) {
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log_error("Could not allocate message.");
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r = -ENOMEM;
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, &table[i].special,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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r = -ENOMEM;
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goto finish;
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}
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if (!(reply = dbus_connection_send_with_reply_and_block(c->bus, m, -1, &error))) {
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dbus_error_free(&error);
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continue;
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}
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if (!dbus_message_get_args(reply, &error,
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DBUS_TYPE_OBJECT_PATH, &path,
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DBUS_TYPE_INVALID)) {
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log_error("Failed to parse reply: %s", bus_error_message(&error));
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r = -EIO;
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goto finish;
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}
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dbus_message_unref(m);
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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path,
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"org.freedesktop.DBus.Properties",
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"Get"))) {
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log_error("Could not allocate message.");
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r = -ENOMEM;
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, &interface,
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DBUS_TYPE_STRING, &property,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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r = -ENOMEM;
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goto finish;
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}
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dbus_message_unref(reply);
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if (!(reply = dbus_connection_send_with_reply_and_block(c->bus, m, -1, &error))) {
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log_error("Failed to send command: %s", bus_error_message(&error));
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r = -EIO;
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goto finish;
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}
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if (!dbus_message_iter_init(reply, &iter) ||
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dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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dbus_message_iter_recurse(&iter, &sub);
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if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRING) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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dbus_message_iter_get_basic(&sub, &state);
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if (streq(state, "active") || streq(state, "reloading"))
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r = table[i].runlevel;
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dbus_message_unref(m);
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dbus_message_unref(reply);
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m = reply = NULL;
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if (r)
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break;
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}
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finish:
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if (m)
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dbus_message_unref(m);
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if (reply)
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dbus_message_unref(reply);
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dbus_error_free(&error);
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return r;
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}
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static int on_reboot(Context *c) {
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int r = 0, q;
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usec_t t;
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assert(c);
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/* We finished start-up, so let's write the utmp
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* record and send the audit msg */
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#ifdef HAVE_AUDIT
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if (c->audit_fd >= 0)
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if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_BOOT, "init", NULL, NULL, NULL, 1) < 0) {
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log_error("Failed to send audit message: %m");
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r = -errno;
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}
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#endif
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/* If this call fails it will return 0, which
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* utmp_put_reboot() will then fix to the current time */
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t = get_startup_time(c);
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if ((q = utmp_put_reboot(t)) < 0) {
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log_error("Failed to write utmp record: %s", strerror(-q));
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r = q;
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}
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return r;
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}
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static int on_shutdown(Context *c) {
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int r = 0, q;
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assert(c);
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/* We started shut-down, so let's write the utmp
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* record and send the audit msg */
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#ifdef HAVE_AUDIT
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if (c->audit_fd >= 0)
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if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_SHUTDOWN, "init", NULL, NULL, NULL, 1) < 0) {
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log_error("Failed to send audit message: %m");
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r = -errno;
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}
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#endif
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if ((q = utmp_put_shutdown()) < 0) {
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log_error("Failed to write utmp record: %s", strerror(-q));
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r = q;
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}
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return r;
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}
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static int on_runlevel(Context *c) {
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int r = 0, q, previous, runlevel;
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assert(c);
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/* We finished changing runlevel, so let's write the
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* utmp record and send the audit msg */
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/* First, get last runlevel */
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if ((q = utmp_get_runlevel(&previous, NULL)) < 0) {
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if (q != -ESRCH && q != -ENOENT) {
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log_error("Failed to get current runlevel: %s", strerror(-q));
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return q;
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}
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/* Hmm, we didn't find any runlevel, that means we
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* have been rebooted */
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r = on_reboot(c);
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previous = 0;
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}
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/* Secondly, get new runlevel */
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if ((runlevel = get_current_runlevel(c)) < 0)
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return runlevel;
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if (previous == runlevel)
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return 0;
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#ifdef HAVE_AUDIT
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if (c->audit_fd >= 0) {
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char *s = NULL;
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if (asprintf(&s, "old-level=%c new-level=%c",
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previous > 0 ? previous : 'N',
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runlevel > 0 ? runlevel : 'N') < 0)
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return -ENOMEM;
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if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_RUNLEVEL, s, NULL, NULL, NULL, 1) < 0) {
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log_error("Failed to send audit message: %m");
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r = -errno;
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}
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free(s);
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}
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#endif
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if ((q = utmp_put_runlevel(runlevel, previous)) < 0) {
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log_error("Failed to write utmp record: %s", strerror(-q));
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r = q;
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}
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return r;
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}
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int main(int argc, char *argv[]) {
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int r;
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DBusError error;
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Context c;
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dbus_error_init(&error);
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zero(c);
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#ifdef HAVE_AUDIT
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c.audit_fd = -1;
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#endif
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if (getppid() != 1) {
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log_error("This program should be invoked by init only.");
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return EXIT_FAILURE;
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}
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if (argc != 2) {
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log_error("This program requires one argument.");
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return EXIT_FAILURE;
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}
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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umask(0022);
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#ifdef HAVE_AUDIT
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if ((c.audit_fd = audit_open()) < 0 &&
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/* If the kernel lacks netlink or audit support,
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* don't worry about it. */
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errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT)
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log_error("Failed to connect to audit log: %m");
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#endif
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if (bus_connect(DBUS_BUS_SYSTEM, &c.bus, NULL, &error) < 0) {
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log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
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r = -EIO;
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goto finish;
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}
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log_debug("systemd-update-utmp running as pid %lu", (unsigned long) getpid());
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if (streq(argv[1], "reboot"))
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r = on_reboot(&c);
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else if (streq(argv[1], "shutdown"))
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r = on_shutdown(&c);
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else if (streq(argv[1], "runlevel"))
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r = on_runlevel(&c);
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else {
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log_error("Unknown command %s", argv[1]);
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r = -EINVAL;
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}
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log_debug("systemd-update-utmp stopped as pid %lu", (unsigned long) getpid());
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finish:
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#ifdef HAVE_AUDIT
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if (c.audit_fd >= 0)
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audit_close(c.audit_fd);
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#endif
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if (c.bus) {
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dbus_connection_flush(c.bus);
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dbus_connection_close(c.bus);
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dbus_connection_unref(c.bus);
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}
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dbus_error_free(&error);
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dbus_shutdown();
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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