logind-session-dbus.c revision 718db96199eb307751264e4163555662c9a389fa
/*-*- 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 "util.h"
#include "strv.h"
#include "bus-util.h"
#include "bus-errors.h"
#include "logind.h"
#include "logind-session.h"
#include "logind-session-device.h"
static int property_get_user(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
sd_bus_error *error,
void *userdata) {
_cleanup_free_ char *p = NULL;
Session *s = userdata;
assert(bus);
assert(reply);
assert(s);
p = user_bus_path(s->user);
if (!p)
return -ENOMEM;
return sd_bus_message_append(reply, "(uo)", (uint32_t) s->user->uid, p);
}
static int property_get_name(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
sd_bus_error *error,
void *userdata) {
Session *s = userdata;
assert(bus);
assert(reply);
assert(s);
return sd_bus_message_append(reply, "s", s->user->name);
}
static int property_get_seat(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
sd_bus_error *error,
void *userdata) {
_cleanup_free_ char *p = NULL;
Session *s = userdata;
assert(bus);
assert(reply);
assert(s);
p = s->seat ? seat_bus_path(s->seat) : strdup("/");
if (!p)
return -ENOMEM;
return sd_bus_message_append(reply, "(so)", s->seat ? s->seat->id : "", p);
}
static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_type, session_type, SessionType);
static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_class, session_class, SessionClass);
static int property_get_active(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
sd_bus_error *error,
void *userdata) {
Session *s = userdata;
assert(bus);
assert(reply);
assert(s);
return sd_bus_message_append(reply, "b", session_is_active(s));
}
static int property_get_state(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
sd_bus_error *error,
void *userdata) {
Session *s = userdata;
assert(bus);
assert(reply);
assert(s);
return sd_bus_message_append(reply, "s", session_state_to_string(session_get_state(s)));
}
static int property_get_idle_hint(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
sd_bus_error *error,
void *userdata) {
Session *s = userdata;
assert(bus);
assert(reply);
assert(s);
return sd_bus_message_append(reply, "b", session_get_idle_hint(s, NULL) > 0);
}
static int property_get_idle_since_hint(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
sd_bus_error *error,
void *userdata) {
Session *s = userdata;
dual_timestamp t;
uint64_t u;
int r;
assert(bus);
assert(reply);
assert(s);
r = session_get_idle_hint(s, &t);
if (r < 0)
return r;
u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
return sd_bus_message_append(reply, "t", u);
}
static int method_terminate(sd_bus *bus, sd_bus_message *message, void *userdata) {
Session *s = userdata;
int r;
assert(bus);
assert(message);
assert(s);
r = session_stop(s);
if (r < 0)
return sd_bus_reply_method_errno(bus, message, r, NULL);
return sd_bus_reply_method_return(bus, message, NULL);
}
static int method_activate(sd_bus *bus, sd_bus_message *message, void *userdata) {
Session *s = userdata;
int r;
assert(bus);
assert(message);
assert(s);
r = session_activate(s);
if (r < 0)
return sd_bus_reply_method_errno(bus, message, r, NULL);
return sd_bus_reply_method_return(bus, message, NULL);
}
static int method_lock(sd_bus *bus, sd_bus_message *message, void *userdata) {
Session *s = userdata;
int r;
assert(bus);
assert(message);
assert(s);
r = session_send_lock(s, streq(sd_bus_message_get_member(message), "Lock"));
if (r < 0)
return sd_bus_reply_method_errno(bus, message, r, NULL);
return sd_bus_reply_method_return(bus, message, NULL);
}
static int method_set_idle_hint(sd_bus *bus, sd_bus_message *message, void *userdata) {
Session *s = userdata;
uid_t uid;
int r, b;
assert(bus);
assert(message);
assert(s);
r = sd_bus_message_read(message, "b", &b);
if (r < 0)
return sd_bus_reply_method_errno(bus, message, r, NULL);
r = sd_bus_get_owner_uid(bus, sd_bus_message_get_sender(message), &uid);
if (r < 0)
return sd_bus_reply_method_errno(bus, message, r, NULL);
if (uid != 0 && uid != s->user->uid)
return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_ACCESS_DENIED, "Only owner of session my set idle hint");
session_set_idle_hint(s, b);
return sd_bus_reply_method_return(bus, message, NULL);
}
static int method_kill(sd_bus *bus, sd_bus_message *message, void *userdata) {
Session *s = userdata;
const char *swho;
int32_t signo;
KillWho who;
int r;
assert(bus);
assert(message);
assert(s);
r = sd_bus_message_read(message, "si", &swho, &signo);
if (r < 0)
return sd_bus_reply_method_errno(bus, message, r, NULL);
if (isempty(swho))
who = KILL_ALL;
else {
who = kill_who_from_string(swho);
if (who < 0)
return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Invalid kill parameter '%s'", swho);
}
if (signo <= 0 || signo >= _NSIG)
return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
r = session_kill(s, who, signo);
if (r < 0)
return sd_bus_reply_method_errno(bus, message, r, NULL);
return sd_bus_reply_method_return(bus, message, NULL);
}
static int method_take_control(sd_bus *bus, sd_bus_message *message, void *userdata) {
Session *s = userdata;
int r, force;
uid_t uid;
assert(bus);
assert(message);
assert(s);
r = sd_bus_message_read(message, "b", &force);
if (r < 0)
return sd_bus_reply_method_errno(bus, message, r, NULL);
r = sd_bus_get_owner_uid(bus, sd_bus_message_get_sender(message), &uid);
if (r < 0)
return sd_bus_reply_method_errno(bus, message, r, NULL);
if (uid != 0 && (force || uid != s->user->uid))
return sd_bus_reply_method_errorf(bus, message, SD_BUS_ERROR_ACCESS_DENIED, "Only owner of session may take control");
r = session_set_controller(s, sd_bus_message_get_sender(message), force);
if (r < 0)
return sd_bus_reply_method_errno(bus, message, r, NULL);
return sd_bus_reply_method_return(bus, message, NULL);
}
static int method_release_control(sd_bus *bus, sd_bus_message *message, void *userdata) {
Session *s = userdata;
assert(bus);
assert(message);
assert(s);
if (!session_is_controller(s, sd_bus_message_get_sender(message)))
return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session");
session_drop_controller(s);
return sd_bus_reply_method_return(bus, message, NULL);
}
static int method_take_device(sd_bus *bus, sd_bus_message *message, void *userdata) {
Session *s = userdata;
uint32_t major, minor;
SessionDevice *sd;
dev_t dev;
int r;
assert(bus);
assert(message);
assert(s);
r = sd_bus_message_read(message, "uu", &major, &minor);
if (r < 0)
return sd_bus_reply_method_errno(bus, message, r, NULL);
if (!session_is_controller(s, sd_bus_message_get_sender(message)))
return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session");
dev = makedev(major, minor);
sd = hashmap_get(s->devices, &dev);
if (sd)
/* We don't allow retrieving a device multiple times.
* The related ReleaseDevice call is not ref-counted.
* The caller should use dup() if it requires more
* than one fd (it would be functionally
* equivalent). */
return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_DEVICE_IS_TAKEN, "Device already taken");
r = session_device_new(s, dev, &sd);
if (r < 0)
return sd_bus_reply_method_errno(bus, message, r, NULL);
r = sd_bus_reply_method_return(bus, message, "hb", sd->fd, !sd->active);
if (r < 0)
session_device_free(sd);
return r;
}
static int method_release_device(sd_bus *bus, sd_bus_message *message, void *userdata) {
Session *s = userdata;
uint32_t major, minor;
SessionDevice *sd;
dev_t dev;
int r;
assert(bus);
assert(message);
assert(s);
r = sd_bus_message_read(message, "uu", &major, &minor);
if (r < 0)
return sd_bus_reply_method_errno(bus, message, r, NULL);
if (!session_is_controller(s, sd_bus_message_get_sender(message)))
return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session");
dev = makedev(major, minor);
sd = hashmap_get(s->devices, &dev);
if (!sd)
return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_DEVICE_NOT_TAKEN, "Device not taken");
session_device_free(sd);
return sd_bus_reply_method_return(bus, message, NULL);
}
static int method_pause_device_complete(sd_bus *bus, sd_bus_message *message, void *userdata) {
Session *s = userdata;
uint32_t major, minor;
SessionDevice *sd;
dev_t dev;
int r;
assert(bus);
assert(message);
assert(s);
r = sd_bus_message_read(message, "uu", &major, &minor);
if (r < 0)
return sd_bus_reply_method_errno(bus, message, r, NULL);
if (!session_is_controller(s, sd_bus_message_get_sender(message)))
return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session");
dev = makedev(major, minor);
sd = hashmap_get(s->devices, &dev);
if (!sd)
return sd_bus_reply_method_errorf(bus, message, BUS_ERROR_DEVICE_NOT_TAKEN, "Device not taken");
session_device_complete_pause(sd);
return sd_bus_reply_method_return(bus, message, NULL);
}
const sd_bus_vtable session_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Session, id), 0),
SD_BUS_PROPERTY("User", "(uo)", property_get_user, 0, 0),
SD_BUS_PROPERTY("Name", "s", property_get_name, 0, 0),
SD_BUS_PROPERTY("Timestamp", "t", NULL, offsetof(Session, timestamp.realtime), 0),
SD_BUS_PROPERTY("TimestampMonotonic", "t", NULL, offsetof(Session, timestamp.monotonic), 0),
SD_BUS_PROPERTY("VTNr", "u", NULL, offsetof(Session, vtnr), 0),
SD_BUS_PROPERTY("Seat", "(so)", property_get_seat, 0, 0),
SD_BUS_PROPERTY("TTY", "s", NULL, offsetof(Session, tty), 0),
SD_BUS_PROPERTY("Display", "s", NULL, offsetof(Session, display), 0),
SD_BUS_PROPERTY("Remote", "b", bus_property_get_bool, offsetof(Session, remote), 0),
SD_BUS_PROPERTY("RemoteHost", "s", NULL, offsetof(Session, remote_host), 0),
SD_BUS_PROPERTY("RemoteUser", "s", NULL, offsetof(Session, remote_user), 0),
SD_BUS_PROPERTY("Service", "s", NULL, offsetof(Session, service), 0),
SD_BUS_PROPERTY("Scope", "s", NULL, offsetof(Session, scope), 0),
SD_BUS_PROPERTY("Leader", "u", bus_property_get_pid, offsetof(Session, leader), 0),
SD_BUS_PROPERTY("Audit", "u", NULL, offsetof(Session, audit_id), 0),
SD_BUS_PROPERTY("Type", "s", property_get_type, offsetof(Session, type), 0),
SD_BUS_PROPERTY("Class", "s", property_get_class, offsetof(Session, class), 0),
SD_BUS_PROPERTY("Active", "b", property_get_active, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_METHOD("Terminate", NULL, NULL, method_terminate, 0),
SD_BUS_METHOD("Activate", NULL, NULL, method_activate, 0),
SD_BUS_METHOD("Lock", NULL, NULL, method_lock, 0),
SD_BUS_METHOD("Unlock", NULL, NULL, method_lock, 0),
SD_BUS_METHOD("SetIdleHint", "b", NULL, method_set_idle_hint, 0),
SD_BUS_METHOD("Kill", "si", NULL, method_kill, 0),
SD_BUS_METHOD("TakeControl", "b", NULL, method_take_control, 0),
SD_BUS_METHOD("ReleaseControl", NULL, NULL, method_release_control, 0),
SD_BUS_METHOD("TakeDevice", "uu", "hb", method_take_device, 0),
SD_BUS_METHOD("ReleaseDevice", "uu", NULL, method_release_device, 0),
SD_BUS_METHOD("PauseDeviceComplete", "uu", NULL, method_pause_device_complete, 0),
SD_BUS_SIGNAL("PauseDevice", "uus", 0),
SD_BUS_SIGNAL("ResumeDevice", "uuh", 0),
SD_BUS_SIGNAL("Lock", NULL, 0),
SD_BUS_SIGNAL("Unlock", NULL, 0),
SD_BUS_VTABLE_END
};
int session_object_find(sd_bus *bus, const char *path, const char *interface, void **found, void *userdata) {
Manager *m = userdata;
Session *session;
int r;
assert(bus);
assert(path);
assert(interface);
assert(found);
assert(m);
if (streq(path, "/org/freedesktop/login1/session/self")) {
sd_bus_message *message;
pid_t pid;
message = sd_bus_get_current(bus);
if (!message)
return 0;
r = sd_bus_get_owner_pid(bus, sd_bus_message_get_sender(message), &pid);
if (r < 0)
return 0;
r = manager_get_session_by_pid(m, pid, &session);
if (r <= 0)
return 0;
} else {
_cleanup_free_ char *e = NULL;
const char *p;
p = startswith(path, "/org/freedesktop/login1/session/");
if (!p)
return 0;
e = bus_path_unescape(p);
if (!e)
return -ENOMEM;
session = hashmap_get(m->sessions, e);
if (!session)
return 0;
}
*found = session;
return 1;
}
char *session_bus_path(Session *s) {
_cleanup_free_ char *t = NULL;
assert(s);
t = bus_path_escape(s->id);
if (!t)
return NULL;
return strappend("/org/freedesktop/login1/session/", t);
}
int session_node_enumerator(sd_bus *bus, const char *path, char ***nodes, void *userdata) {
_cleanup_strv_free_ char **l = NULL;
Manager *m = userdata;
Session *session;
Iterator i;
int r;
assert(bus);
assert(path);
assert(nodes);
HASHMAP_FOREACH(session, m->sessions, i) {
char *p;
p = session_bus_path(session);
if (!p)
return -ENOMEM;
r = strv_push(&l, p);
if (r < 0) {
free(p);
return r;
}
}
*nodes = l;
l = NULL;
return 1;
}
int session_send_signal(Session *s, bool new_session) {
_cleanup_free_ char *p = NULL;
assert(s);
p = session_bus_path(s);
if (!p)
return -ENOMEM;
return sd_bus_emit_signal(
s->manager->bus,
"/org/freedesktop/login1",
"org.freedesktop.login1.Manager",
new_session ? "SessionNew" : "SessionRemoved",
"so", s->id, p);
}
int session_send_changed(Session *s, const char *properties, ...) {
_cleanup_free_ char *p = NULL;
char **l;
assert(s);
if (!s->started)
return 0;
p = session_bus_path(s);
if (!p)
return -ENOMEM;
l = strv_from_stdarg_alloca(properties);
return sd_bus_emit_properties_changed_strv(s->manager->bus, p, "org.freedesktop.login1.Session", l);
}
int session_send_lock(Session *s, bool lock) {
_cleanup_free_ char *p = NULL;
assert(s);
p = session_bus_path(s);
if (!p)
return -ENOMEM;
return sd_bus_emit_signal(
s->manager->bus,
p,
"org.freedesktop.login1.Session",
lock ? "Lock" : "Unlock",
NULL);
}
int session_send_lock_all(Manager *m, bool lock) {
Session *session;
Iterator i;
int r = 0;
assert(m);
HASHMAP_FOREACH(session, m->sessions, i) {
int k;
k = session_send_lock(session, lock);
if (k < 0)
r = k;
}
return r;
}
int session_send_create_reply(Session *s, sd_bus_error *error) {
_cleanup_bus_message_unref_ sd_bus_message *c = NULL;
_cleanup_close_ int fifo_fd = -1;
_cleanup_free_ char *p = NULL;
assert(s);
/* This is called after the session scope was successfully
* created, and finishes where bus_manager_create_session()
* left off. */
if (!s->create_message)
return 0;
c = s->create_message;
s->create_message = NULL;
if (error)
return sd_bus_reply_method_error(s->manager->bus, c, error);
fifo_fd = session_create_fifo(s);
if (fifo_fd < 0)
return fifo_fd;
/* Update the session state file before we notify the client
* about the result. */
session_save(s);
p = session_bus_path(s);
if (!p)
return -ENOMEM;
log_debug("Sending reply about created session: "
"id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u",
s->id,
p,
s->user->runtime_path,
fifo_fd,
s->seat ? s->seat->id : "",
(uint32_t) s->vtnr);
return sd_bus_reply_method_return(
s->manager->bus, c,
"soshsub",
s->id,
p,
s->user->runtime_path,
fifo_fd,
s->seat ? s->seat->id : "",
(uint32_t) s->vtnr,
false);
}