424 lines
14 KiB
C
424 lines
14 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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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 General Public License as published by
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the Free Software Foundation; either version 2 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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General Public License for more details.
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You should have received a copy of the GNU 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 <errno.h>
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#include "dbus.h"
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#include "log.h"
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static const char introspection[] =
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DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
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"<node>"
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" <interface name=\"org.freedesktop.systemd1.Unit\">"
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" <method name=\"Start\">"
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" <arg name=\"mode\" type=\"s\" direction=\"in\"/>"
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" <arg name=\"job\" type=\"o\" direction=\"out\"/>"
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" </method>"
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" <method name=\"Stop\">"
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" <arg name=\"mode\" type=\"s\" direction=\"in\"/>"
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" <arg name=\"job\" type=\"o\" direction=\"out\"/>"
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" </method>"
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" <method name=\"Restart\">"
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" <arg name=\"mode\" type=\"s\" direction=\"in\"/>"
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" <arg name=\"job\" type=\"o\" direction=\"out\"/>"
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" </method>"
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" <method name=\"Reload\">"
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" <arg name=\"mode\" type=\"s\" direction=\"in\"/>"
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" <arg name=\"job\" type=\"o\" direction=\"out\"/>"
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" </method>"
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" <signal name=\"Changed\"/>"
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" <property name=\"Id\" type=\"s\" access=\"read\"/>"
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" <property name=\"Description\" type=\"s\" access=\"read\"/>"
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" <property name=\"LoadState\" type=\"s\" access=\"read\"/>"
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" <property name=\"ActiveState\" type=\"s\" access=\"read\"/>"
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" <property name=\"FragmentPath\" type=\"s\" access=\"read\"/>"
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" <property name=\"ActiveEnterTimestamp\" type=\"t\" access=\"read\"/>"
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" <property name=\"ActiveExitTimestamp\" type=\"t\" access=\"read\"/>"
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" <property name=\"CanReload\" type=\"b\" access=\"read\"/>"
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" <property name=\"CanStart\" type=\"b\" access=\"read\"/>"
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" <property name=\"Job\" type=\"(uo)\" access=\"read\"/>"
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" </interface>"
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BUS_PROPERTIES_INTERFACE
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BUS_INTROSPECTABLE_INTERFACE
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"</node>";
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static int bus_unit_append_id(Manager *m, DBusMessageIter *i, const char *property, void *data) {
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Unit *u = data;
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const char *id;
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assert(m);
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assert(i);
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assert(property);
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assert(u);
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id = unit_id(u);
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if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &id))
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return -ENOMEM;
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return 0;
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}
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static int bus_unit_append_description(Manager *m, DBusMessageIter *i, const char *property, void *data) {
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Unit *u = data;
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const char *d;
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assert(m);
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assert(i);
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assert(property);
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assert(u);
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d = unit_description(u);
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if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &d))
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return -ENOMEM;
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return 0;
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}
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static int bus_unit_append_load_state(Manager *m, DBusMessageIter *i, const char *property, void *data) {
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Unit *u = data;
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const char *state;
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assert(m);
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assert(i);
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assert(property);
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assert(u);
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state = unit_load_state_to_string(u->meta.load_state);
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if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state))
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return -ENOMEM;
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return 0;
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}
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static int bus_unit_append_active_state(Manager *m, DBusMessageIter *i, const char *property, void *data) {
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Unit *u = data;
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const char *state;
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assert(m);
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assert(i);
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assert(property);
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assert(u);
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state = unit_active_state_to_string(unit_active_state(u));
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if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state))
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return -ENOMEM;
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return 0;
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}
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static int bus_unit_append_can_reload(Manager *m, DBusMessageIter *i, const char *property, void *data) {
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Unit *u = data;
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dbus_bool_t b;
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assert(m);
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assert(i);
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assert(property);
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assert(u);
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b = unit_can_reload(u);
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if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
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return -ENOMEM;
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return 0;
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}
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static int bus_unit_append_can_start(Manager *m, DBusMessageIter *i, const char *property, void *data) {
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Unit *u = data;
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dbus_bool_t b;
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assert(m);
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assert(i);
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assert(property);
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assert(u);
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b = unit_can_start(u);
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if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
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return -ENOMEM;
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return 0;
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}
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static int bus_unit_append_job(Manager *m, DBusMessageIter *i, const char *property, void *data) {
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Unit *u = data;
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DBusMessageIter sub;
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char *p;
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assert(m);
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assert(i);
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assert(property);
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assert(u);
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if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
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return -ENOMEM;
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if (u->meta.job) {
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if (!(p = job_dbus_path(u->meta.job)))
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return -ENOMEM;
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if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &u->meta.job->id) ||
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!dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
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free(p);
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return -ENOMEM;
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}
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} else {
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uint32_t id = 0;
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/* No job, so let's fill in some placeholder
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* data. Since we need to fill in a valid path we
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* simple point to ourselves. */
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if (!(p = unit_dbus_path(u)))
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return -ENOMEM;
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if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &id) ||
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!dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
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free(p);
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return -ENOMEM;
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}
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}
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free(p);
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if (!dbus_message_iter_close_container(i, &sub))
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return -ENOMEM;
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return 0;
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}
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static DBusHandlerResult bus_unit_message_dispatch(Unit *u, DBusMessage *message) {
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const BusProperty properties[] = {
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{ "org.freedesktop.systemd1.Unit", "Id", bus_unit_append_id, "s", u },
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{ "org.freedesktop.systemd1.Unit", "Description", bus_unit_append_description, "s", u },
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{ "org.freedesktop.systemd1.Unit", "LoadState", bus_unit_append_load_state, "s", u },
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{ "org.freedesktop.systemd1.Unit", "ActiveState", bus_unit_append_active_state, "s", u },
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{ "org.freedesktop.systemd1.Unit", "FragmentPath", bus_property_append_string, "s", u->meta.fragment_path },
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{ "org.freedesktop.systemd1.Unit", "ActiveEnterTimestamp", bus_property_append_uint64, "t", &u->meta.active_enter_timestamp },
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{ "org.freedesktop.systemd1.Unit", "ActiveExitTimestamp", bus_property_append_uint64, "t", &u->meta.active_exit_timestamp },
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{ "org.freedesktop.systemd1.Unit", "CanReload", bus_unit_append_can_reload, "b", u },
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{ "org.freedesktop.systemd1.Unit", "CanStart", bus_unit_append_can_start, "b", u },
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{ "org.freedesktop.systemd1.Unit", "Job", bus_unit_append_job, "(uo)", u },
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{ NULL, NULL, NULL, NULL, NULL }
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};
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DBusMessage *reply = NULL;
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Manager *m = u->meta.manager;
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DBusError error;
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JobType job_type = _JOB_TYPE_INVALID;
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dbus_error_init(&error);
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if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Start"))
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job_type = JOB_START;
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else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Stop"))
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job_type = JOB_STOP;
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else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Reload"))
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job_type = JOB_RELOAD;
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else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Restart"))
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job_type = JOB_RESTART;
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else
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return bus_default_message_handler(u->meta.manager, message, introspection, properties);
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if (job_type != _JOB_TYPE_INVALID) {
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const char *smode;
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JobMode mode;
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Job *j;
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int r;
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char *path;
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if (!dbus_message_get_args(
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message,
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&error,
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DBUS_TYPE_STRING, &smode,
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DBUS_TYPE_INVALID))
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return bus_send_error_reply(m, message, &error, -EINVAL);
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if ((mode = job_mode_from_string(smode)) == _JOB_MODE_INVALID)
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return bus_send_error_reply(m, message, NULL, -EINVAL);
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if ((r = manager_add_job(m, job_type, u, mode, true, &j)) < 0)
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return bus_send_error_reply(m, message, NULL, r);
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if (!(reply = dbus_message_new_method_return(message)))
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goto oom;
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if (!(path = job_dbus_path(j)))
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goto oom;
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if (!dbus_message_append_args(
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reply,
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DBUS_TYPE_OBJECT_PATH, &path,
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DBUS_TYPE_INVALID))
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goto oom;
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}
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if (reply) {
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if (!dbus_connection_send(m->bus, reply, NULL))
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goto oom;
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dbus_message_unref(reply);
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}
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return DBUS_HANDLER_RESULT_HANDLED;
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oom:
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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 DBUS_HANDLER_RESULT_NEED_MEMORY;
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}
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static DBusHandlerResult bus_unit_message_handler(DBusConnection *connection, DBusMessage *message, void *data) {
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Manager *m = data;
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Unit *u;
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int r;
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assert(connection);
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assert(message);
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assert(m);
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log_debug("Got D-Bus request: %s.%s() on %s",
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dbus_message_get_interface(message),
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dbus_message_get_member(message),
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dbus_message_get_path(message));
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if ((r = manager_get_unit_from_dbus_path(m, dbus_message_get_path(message), &u)) < 0) {
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if (r == -ENOMEM)
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return DBUS_HANDLER_RESULT_NEED_MEMORY;
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if (r == -ENOENT)
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return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
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return bus_send_error_reply(m, message, NULL, r);
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}
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return bus_unit_message_dispatch(u, message);
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}
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const DBusObjectPathVTable bus_unit_vtable = {
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.message_function = bus_unit_message_handler
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};
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void bus_unit_send_change_signal(Unit *u) {
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char *p = NULL;
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DBusMessage *m = NULL;
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assert(u);
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assert(u->meta.in_dbus_queue);
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LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
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u->meta.in_dbus_queue = false;
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if (set_isempty(u->meta.manager->subscribed))
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return;
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if (!(p = unit_dbus_path(u)))
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goto oom;
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if (u->meta.sent_dbus_new_signal) {
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/* Send a change signal */
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if (!(m = dbus_message_new_signal(p, "org.freedesktop.systemd1.Unit", "Changed")))
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goto oom;
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} else {
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const char *id;
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/* Send a new signal */
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if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1", "UnitNew")))
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goto oom;
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id = unit_id(u);
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, &id,
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DBUS_TYPE_OBJECT_PATH, &p,
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DBUS_TYPE_INVALID))
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goto oom;
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}
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if (!dbus_connection_send(u->meta.manager->bus, m, NULL))
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goto oom;
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free(p);
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dbus_message_unref(m);
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u->meta.sent_dbus_new_signal = true;
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return;
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oom:
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free(p);
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if (m)
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dbus_message_unref(m);
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log_error("Failed to allocate unit change/new signal.");
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}
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void bus_unit_send_removed_signal(Unit *u) {
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char *p = NULL;
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DBusMessage *m = NULL;
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const char *id;
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assert(u);
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if (set_isempty(u->meta.manager->subscribed) || !u->meta.sent_dbus_new_signal)
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return;
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if (!(p = unit_dbus_path(u)))
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goto oom;
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if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1", "UnitRemoved")))
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goto oom;
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id = unit_id(u);
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, &id,
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DBUS_TYPE_OBJECT_PATH, &p,
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DBUS_TYPE_INVALID))
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goto oom;
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if (!dbus_connection_send(u->meta.manager->bus, m, NULL))
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goto oom;
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free(p);
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dbus_message_unref(m);
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return;
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oom:
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free(p);
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if (m)
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dbus_message_unref(m);
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log_error("Failed to allocate unit remove signal.");
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}
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