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Systemd/src/login/logind-machine-dbus.c

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 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 <errno.h>
#include <string.h>
#include "logind.h"
#include "logind-machine.h"
#include "dbus-common.h"
#define BUS_MACHINE_INTERFACE \
" <interface name=\"org.freedesktop.login1.Machine\">\n" \
" <method name=\"Terminate\"/>\n" \
" <method name=\"Kill\">\n" \
" <arg name=\"who\" type=\"s\"/>\n" \
" <arg name=\"signal\" type=\"s\"/>\n" \
" </method>\n" \
" <property name=\"Name\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"Id\" type=\"ay\" access=\"read\"/>\n" \
" <property name=\"Timestamp\" type=\"t\" access=\"read\"/>\n" \
" <property name=\"TimestampMonotonic\" type=\"t\" access=\"read\"/>\n" \
" <property name=\"DefaultControlGroup\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"Service\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"Slice\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"Leader\" type=\"u\" access=\"read\"/>\n" \
" <property name=\"Class\" type=\"s\" access=\"read\"/>\n" \
" <property name=\"RootDirectory\" type=\"s\" access=\"read\"/>\n" \
" </interface>\n"
#define INTROSPECTION \
DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE \
"<node>\n" \
BUS_MACHINE_INTERFACE \
BUS_PROPERTIES_INTERFACE \
BUS_PEER_INTERFACE \
BUS_INTROSPECTABLE_INTERFACE \
"</node>\n"
#define INTERFACES_LIST \
BUS_GENERIC_INTERFACES_LIST \
"org.freedesktop.login1.Machine\0"
static int bus_machine_append_default_cgroup(DBusMessageIter *i, const char *property, void *data) {
_cleanup_free_ char *t = NULL;
Machine *m = data;
int r;
bool success;
assert(i);
assert(property);
assert(m);
r = cg_join_spec(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, &t);
if (r < 0)
return r;
success = dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t);
return success ? 0 : -ENOMEM;
}
static int bus_machine_append_id(DBusMessageIter *i, const char *property, void *data) {
DBusMessageIter sub;
Machine *m = data;
dbus_bool_t b;
void *p;
assert(i);
assert(property);
assert(m);
if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "y", &sub))
return -ENOMEM;
p = &m->id;
b = dbus_message_iter_append_fixed_array(&sub, DBUS_TYPE_BYTE, &p, 16);
if (!b)
return -ENOMEM;
if (!dbus_message_iter_close_container(i, &sub))
return -ENOMEM;
return 0;
}
static int get_machine_for_path(Manager *m, const char *path, Machine **_machine) {
_cleanup_free_ char *e = NULL;
Machine *machine;
assert(m);
assert(path);
assert(_machine);
if (!startswith(path, "/org/freedesktop/login1/machine/"))
return -EINVAL;
e = bus_path_unescape(path + 32);
if (!e)
return -ENOMEM;
machine = hashmap_get(m->machines, e);
if (!machine)
return -ENOENT;
*_machine = machine;
return 0;
}
static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_machine_append_class, machine_class, MachineClass);
static const BusProperty bus_login_machine_properties[] = {
{ "Name", bus_property_append_string, "s", offsetof(Machine, name), true },
{ "Id", bus_machine_append_id, "ay", 0 },
{ "Timestamp", bus_property_append_usec, "t", offsetof(Machine, timestamp.realtime) },
{ "TimestampMonotonic", bus_property_append_usec, "t", offsetof(Machine, timestamp.monotonic) },
{ "DefaultControlGroup", bus_machine_append_default_cgroup, "s", 0 },
{ "Service", bus_property_append_string, "s", offsetof(Machine, service), true },
{ "Slice", bus_property_append_string, "s", offsetof(Machine, slice), true },
{ "Leader", bus_property_append_pid, "u", offsetof(Session, leader) },
{ "Class", bus_machine_append_class, "s", offsetof(Machine, class) },
{ "RootDirectory", bus_property_append_string, "s", offsetof(Machine, root_directory), true },
{ NULL, }
};
static DBusHandlerResult machine_message_dispatch(
Machine *m,
DBusConnection *connection,
DBusMessage *message) {
DBusError error;
_cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
int r;
assert(m);
assert(connection);
assert(message);
if (dbus_message_is_method_call(message, "org.freedesktop.login1.Machine", "Terminate")) {
r = machine_stop(m);
if (r < 0)
return bus_send_error_reply(connection, message, NULL, r);
reply = dbus_message_new_method_return(message);
if (!reply)
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Machine", "Kill")) {
const char *swho;
int32_t signo;
KillWho who;
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_STRING, &swho,
DBUS_TYPE_INT32, &signo,
DBUS_TYPE_INVALID))
return bus_send_error_reply(connection, message, &error, -EINVAL);
if (isempty(swho))
who = KILL_ALL;
else {
who = kill_who_from_string(swho);
if (who < 0)
return bus_send_error_reply(connection, message, &error, -EINVAL);
}
if (signo <= 0 || signo >= _NSIG)
return bus_send_error_reply(connection, message, &error, -EINVAL);
r = machine_kill(m, who, signo);
if (r < 0)
return bus_send_error_reply(connection, message, NULL, r);
reply = dbus_message_new_method_return(message);
if (!reply)
goto oom;
} else {
const BusBoundProperties bps[] = {
{ "org.freedesktop.login1.Machine", bus_login_machine_properties, m },
{ NULL, }
};
return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, bps);
}
if (reply) {
if (!bus_maybe_send_reply(connection, message, reply))
goto oom;
}
return DBUS_HANDLER_RESULT_HANDLED;
oom:
dbus_error_free(&error);
return DBUS_HANDLER_RESULT_NEED_MEMORY;
}
static DBusHandlerResult machine_message_handler(
DBusConnection *connection,
DBusMessage *message,
void *userdata) {
Manager *manager = userdata;
Machine *m;
int r;
r = get_machine_for_path(manager, dbus_message_get_path(message), &m);
if (r < 0) {
if (r == -ENOMEM)
return DBUS_HANDLER_RESULT_NEED_MEMORY;
if (r == -ENOENT) {
DBusError e;
dbus_error_init(&e);
dbus_set_error_const(&e, DBUS_ERROR_UNKNOWN_OBJECT, "Unknown machine");
return bus_send_error_reply(connection, message, &e, r);
}
return bus_send_error_reply(connection, message, NULL, r);
}
return machine_message_dispatch(m, connection, message);
}
const DBusObjectPathVTable bus_machine_vtable = {
.message_function = machine_message_handler
};
char *machine_bus_path(Machine *m) {
_cleanup_free_ char *e = NULL;
assert(m);
e = bus_path_escape(m->name);
if (!e)
return NULL;
return strappend("/org/freedesktop/login1/machine/", e);
}
int machine_send_signal(Machine *m, bool new_machine) {
_cleanup_dbus_message_unref_ DBusMessage *msg = NULL;
_cleanup_free_ char *p = NULL;
assert(m);
msg = dbus_message_new_signal("/org/freedesktop/login1",
"org.freedesktop.login1.Manager",
new_machine ? "MachineNew" : "MachineRemoved");
if (!m)
return -ENOMEM;
p = machine_bus_path(m);
if (!p)
return -ENOMEM;
if (!dbus_message_append_args(
msg,
DBUS_TYPE_STRING, &m->name,
DBUS_TYPE_OBJECT_PATH, &p,
DBUS_TYPE_INVALID))
return -ENOMEM;
if (!dbus_connection_send(m->manager->bus, msg, NULL))
return -ENOMEM;
return 0;
}
int machine_send_changed(Machine *m, const char *properties) {
_cleanup_dbus_message_unref_ DBusMessage *msg = NULL;
_cleanup_free_ char *p = NULL;
assert(m);
if (!m->started)
return 0;
p = machine_bus_path(m);
if (!p)
return -ENOMEM;
msg = bus_properties_changed_new(p, "org.freedesktop.login1.Machine", properties);
if (!msg)
return -ENOMEM;
if (!dbus_connection_send(m->manager->bus, msg, NULL))
return -ENOMEM;
return 0;
}
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