blob: 563ef7079a89e5500a31d25d61cd752fcbad5e4f [file] [log] [blame]
/*-*- 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 General Public License as published by
the Free Software Foundation; either version 2 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include "dbus.h"
#include "log.h"
#include "dbus-unit.h"
#include "bus-errors.h"
const char bus_unit_interface[] _introspect_("Unit") = BUS_UNIT_INTERFACE;
#define INVALIDATING_PROPERTIES \
"LoadState\0" \
"ActiveState\0" \
"SubState\0" \
"InactiveExitTimestamp\0" \
"ActiveEnterTimestamp\0" \
"ActiveExitTimestamp\0" \
"InactiveEnterTimestamp\0" \
"Job\0" \
"NeedDaemonReload\0"
int bus_unit_append_names(Manager *m, DBusMessageIter *i, const char *property, void *data) {
char *t;
Iterator j;
DBusMessageIter sub;
Unit *u = data;
if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
return -ENOMEM;
SET_FOREACH(t, u->meta.names, j)
if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &t))
return -ENOMEM;
if (!dbus_message_iter_close_container(i, &sub))
return -ENOMEM;
return 0;
}
int bus_unit_append_following(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data, *f;
const char *d;
assert(m);
assert(i);
assert(property);
assert(u);
f = unit_following(u);
d = f ? f->meta.id : "";
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &d))
return -ENOMEM;
return 0;
}
int bus_unit_append_dependencies(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u;
Iterator j;
DBusMessageIter sub;
Set *s = data;
if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
return -ENOMEM;
SET_FOREACH(u, s, j)
if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &u->meta.id))
return -ENOMEM;
if (!dbus_message_iter_close_container(i, &sub))
return -ENOMEM;
return 0;
}
int bus_unit_append_description(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
const char *d;
assert(m);
assert(i);
assert(property);
assert(u);
d = unit_description(u);
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &d))
return -ENOMEM;
return 0;
}
DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_unit_append_load_state, unit_load_state, UnitLoadState);
int bus_unit_append_active_state(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
const char *state;
assert(m);
assert(i);
assert(property);
assert(u);
state = unit_active_state_to_string(unit_active_state(u));
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state))
return -ENOMEM;
return 0;
}
int bus_unit_append_sub_state(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
const char *state;
assert(m);
assert(i);
assert(property);
assert(u);
state = unit_sub_state_to_string(u);
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state))
return -ENOMEM;
return 0;
}
int bus_unit_append_can_start(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
dbus_bool_t b;
assert(m);
assert(i);
assert(property);
assert(u);
b = unit_can_start(u) &&
!u->meta.refuse_manual_start;
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
return -ENOMEM;
return 0;
}
int bus_unit_append_can_stop(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
dbus_bool_t b;
assert(m);
assert(i);
assert(property);
assert(u);
/* On the lower levels we assume that every unit we can start
* we can also stop */
b = unit_can_start(u) &&
!u->meta.refuse_manual_stop;
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
return -ENOMEM;
return 0;
}
int bus_unit_append_can_reload(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
dbus_bool_t b;
assert(m);
assert(i);
assert(property);
assert(u);
b = unit_can_reload(u);
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
return -ENOMEM;
return 0;
}
int bus_unit_append_can_isolate(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
dbus_bool_t b;
assert(m);
assert(i);
assert(property);
assert(u);
b = unit_can_isolate(u) &&
!u->meta.refuse_manual_start;
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
return -ENOMEM;
return 0;
}
int bus_unit_append_job(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
DBusMessageIter sub;
char *p;
assert(m);
assert(i);
assert(property);
assert(u);
if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
return -ENOMEM;
if (u->meta.job) {
if (!(p = job_dbus_path(u->meta.job)))
return -ENOMEM;
if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &u->meta.job->id) ||
!dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
free(p);
return -ENOMEM;
}
} else {
uint32_t id = 0;
/* No job, so let's fill in some placeholder
* data. Since we need to fill in a valid path we
* simple point to ourselves. */
if (!(p = unit_dbus_path(u)))
return -ENOMEM;
if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &id) ||
!dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
free(p);
return -ENOMEM;
}
}
free(p);
if (!dbus_message_iter_close_container(i, &sub))
return -ENOMEM;
return 0;
}
int bus_unit_append_default_cgroup(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
char *t;
CGroupBonding *cgb;
bool success;
assert(m);
assert(i);
assert(property);
assert(u);
if ((cgb = unit_get_default_cgroup(u))) {
if (!(t = cgroup_bonding_to_string(cgb)))
return -ENOMEM;
} else
t = (char*) "";
success = dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t);
if (cgb)
free(t);
return success ? 0 : -ENOMEM;
}
int bus_unit_append_cgroups(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
CGroupBonding *cgb;
DBusMessageIter sub;
if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "s", &sub))
return -ENOMEM;
LIST_FOREACH(by_unit, cgb, u->meta.cgroup_bondings) {
char *t;
bool success;
if (!(t = cgroup_bonding_to_string(cgb)))
return -ENOMEM;
success = dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &t);
free(t);
if (!success)
return -ENOMEM;
}
if (!dbus_message_iter_close_container(i, &sub))
return -ENOMEM;
return 0;
}
int bus_unit_append_need_daemon_reload(Manager *m, DBusMessageIter *i, const char *property, void *data) {
Unit *u = data;
dbus_bool_t b;
assert(m);
assert(i);
assert(property);
assert(u);
b = unit_need_daemon_reload(u);
if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
return -ENOMEM;
return 0;
}
static DBusHandlerResult bus_unit_message_dispatch(Unit *u, DBusConnection *connection, DBusMessage *message) {
DBusMessage *reply = NULL;
Manager *m = u->meta.manager;
DBusError error;
JobType job_type = _JOB_TYPE_INVALID;
char *path = NULL;
bool reload_if_possible = false;
dbus_error_init(&error);
if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Start"))
job_type = JOB_START;
else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Stop"))
job_type = JOB_STOP;
else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Reload"))
job_type = JOB_RELOAD;
else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Restart"))
job_type = JOB_RESTART;
else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "TryRestart"))
job_type = JOB_TRY_RESTART;
else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ReloadOrRestart")) {
reload_if_possible = true;
job_type = JOB_RESTART;
} else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ReloadOrTryRestart")) {
reload_if_possible = true;
job_type = JOB_TRY_RESTART;
} else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "Kill")) {
const char *swho, *smode;
int32_t signo;
KillMode mode;
KillWho who;
int r;
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_STRING, &swho,
DBUS_TYPE_STRING, &smode,
DBUS_TYPE_INT32, &signo,
DBUS_TYPE_INVALID))
return bus_send_error_reply(m, connection, message, &error, -EINVAL);
if ((mode = kill_mode_from_string(smode)) < 0 ||
(who = kill_who_from_string(swho)) < 0 ||
signo <= 0 ||
signo >= _NSIG)
return bus_send_error_reply(m, connection, message, &error, -EINVAL);
if ((r = unit_kill(u, who, mode, signo, &error)) < 0)
return bus_send_error_reply(m, connection, message, &error, r);
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
} else if (dbus_message_is_method_call(message, "org.freedesktop.systemd1.Unit", "ResetFailed")) {
unit_reset_failed(u);
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
} else if (UNIT_VTABLE(u)->bus_message_handler)
return UNIT_VTABLE(u)->bus_message_handler(u, connection, message);
else
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
if (job_type != _JOB_TYPE_INVALID) {
const char *smode;
JobMode mode;
Job *j;
int r;
if ((job_type == JOB_START && u->meta.refuse_manual_start) ||
(job_type == JOB_STOP && u->meta.refuse_manual_stop) ||
((job_type == JOB_RESTART || job_type == JOB_TRY_RESTART) &&
(u->meta.refuse_manual_start || u->meta.refuse_manual_stop))) {
dbus_set_error(&error, BUS_ERROR_ONLY_BY_DEPENDENCY, "Operation refused, may be requested by dependency only.");
return bus_send_error_reply(m, connection, message, &error, -EPERM);
}
if (!dbus_message_get_args(
message,
&error,
DBUS_TYPE_STRING, &smode,
DBUS_TYPE_INVALID))
return bus_send_error_reply(m, connection, message, &error, -EINVAL);
if (reload_if_possible && unit_can_reload(u)) {
if (job_type == JOB_RESTART)
job_type = JOB_RELOAD_OR_START;
else if (job_type == JOB_TRY_RESTART)
job_type = JOB_RELOAD;
}
if ((mode = job_mode_from_string(smode)) == _JOB_MODE_INVALID) {
dbus_set_error(&error, BUS_ERROR_INVALID_JOB_MODE, "Job mode %s is invalid.", smode);
return bus_send_error_reply(m, connection, message, &error, -EINVAL);
}
if ((r = manager_add_job(m, job_type, u, mode, true, &error, &j)) < 0)
return bus_send_error_reply(m, connection, message, &error, r);
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
if (!(path = job_dbus_path(j)))
goto oom;
if (!dbus_message_append_args(
reply,
DBUS_TYPE_OBJECT_PATH, &path,
DBUS_TYPE_INVALID))
goto oom;
}
free(path);
if (reply) {
if (!dbus_connection_send(connection, reply, NULL))
goto oom;
dbus_message_unref(reply);
}
return DBUS_HANDLER_RESULT_HANDLED;
oom:
free(path);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return DBUS_HANDLER_RESULT_NEED_MEMORY;
}
static DBusHandlerResult bus_unit_message_handler(DBusConnection *connection, DBusMessage *message, void *data) {
Manager *m = data;
Unit *u;
int r;
DBusMessage *reply;
assert(connection);
assert(message);
assert(m);
if (streq(dbus_message_get_path(message), "/org/freedesktop/systemd1/unit")) {
/* Be nice to gdbus and return introspection data for our mid-level paths */
if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
char *introspection = NULL;
FILE *f;
Iterator i;
const char *k;
size_t size;
if (!(reply = dbus_message_new_method_return(message)))
goto oom;
/* We roll our own introspection code here, instead of
* relying on bus_default_message_handler() because we
* need to generate our introspection string
* dynamically. */
if (!(f = open_memstream(&introspection, &size)))
goto oom;
fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
"<node>\n", f);
fputs(BUS_INTROSPECTABLE_INTERFACE, f);
fputs(BUS_PEER_INTERFACE, f);
HASHMAP_FOREACH_KEY(u, k, m->units, i) {
char *p;
if (k != u->meta.id)
continue;
if (!(p = bus_path_escape(k))) {
fclose(f);
free(introspection);
goto oom;
}
fprintf(f, "<node name=\"%s\"/>", p);
free(p);
}
fputs("</node>\n", f);
if (ferror(f)) {
fclose(f);
free(introspection);
goto oom;
}
fclose(f);
if (!introspection)
goto oom;
if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
free(introspection);
goto oom;
}
free(introspection);
if (!dbus_connection_send(connection, reply, NULL))
goto oom;
dbus_message_unref(reply);
return DBUS_HANDLER_RESULT_HANDLED;
}
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
if ((r = manager_get_unit_from_dbus_path(m, dbus_message_get_path(message), &u)) < 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 unit");
return bus_send_error_reply(m, connection, message, &e, r);
}
return bus_send_error_reply(m, connection, message, NULL, r);
}
return bus_unit_message_dispatch(u, connection, message);
oom:
if (reply)
dbus_message_unref(reply);
return DBUS_HANDLER_RESULT_NEED_MEMORY;
}
const DBusObjectPathVTable bus_unit_vtable = {
.message_function = bus_unit_message_handler
};
void bus_unit_send_change_signal(Unit *u) {
char *p = NULL;
DBusMessage *m = NULL;
assert(u);
if (u->meta.in_dbus_queue) {
LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
u->meta.in_dbus_queue = false;
}
if (!u->meta.id)
return;
if (!bus_has_subscriber(u->meta.manager)) {
u->meta.sent_dbus_new_signal = true;
return;
}
if (!(p = unit_dbus_path(u)))
goto oom;
if (u->meta.sent_dbus_new_signal) {
/* Send a properties changed signal. First for the
* specific type, then for the generic unit. The
* clients may rely on this order to get atomic
* behaviour if needed. */
if (UNIT_VTABLE(u)->bus_invalidating_properties) {
if (!(m = bus_properties_changed_new(p,
UNIT_VTABLE(u)->bus_interface,
UNIT_VTABLE(u)->bus_invalidating_properties)))
goto oom;
if (bus_broadcast(u->meta.manager, m) < 0)
goto oom;
dbus_message_unref(m);
}
if (!(m = bus_properties_changed_new(p, "org.freedesktop.systemd1.Unit", INVALIDATING_PROPERTIES)))
goto oom;
} else {
/* Send a new signal */
if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "UnitNew")))
goto oom;
if (!dbus_message_append_args(m,
DBUS_TYPE_STRING, &u->meta.id,
DBUS_TYPE_OBJECT_PATH, &p,
DBUS_TYPE_INVALID))
goto oom;
}
if (bus_broadcast(u->meta.manager, m) < 0)
goto oom;
free(p);
dbus_message_unref(m);
u->meta.sent_dbus_new_signal = true;
return;
oom:
free(p);
if (m)
dbus_message_unref(m);
log_error("Failed to allocate unit change/new signal.");
}
void bus_unit_send_removed_signal(Unit *u) {
char *p = NULL;
DBusMessage *m = NULL;
assert(u);
if (!bus_has_subscriber(u->meta.manager))
return;
if (!u->meta.sent_dbus_new_signal)
bus_unit_send_change_signal(u);
if (!u->meta.id)
return;
if (!(p = unit_dbus_path(u)))
goto oom;
if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "UnitRemoved")))
goto oom;
if (!dbus_message_append_args(m,
DBUS_TYPE_STRING, &u->meta.id,
DBUS_TYPE_OBJECT_PATH, &p,
DBUS_TYPE_INVALID))
goto oom;
if (bus_broadcast(u->meta.manager, m) < 0)
goto oom;
free(p);
dbus_message_unref(m);
return;
oom:
free(p);
if (m)
dbus_message_unref(m);
log_error("Failed to allocate unit remove signal.");
}