diff options
Diffstat (limited to 'src/login/logind-session-dbus.c')
| -rw-r--r-- | src/login/logind-session-dbus.c | 554 |
1 files changed, 554 insertions, 0 deletions
diff --git a/src/login/logind-session-dbus.c b/src/login/logind-session-dbus.c new file mode 100644 index 0000000000..ec823af547 --- /dev/null +++ b/src/login/logind-session-dbus.c @@ -0,0 +1,554 @@ +/*-*- 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-session.h" +#include "dbus-common.h" +#include "util.h" + +#define BUS_SESSION_INTERFACE \ + " <interface name=\"org.freedesktop.login1.Session\">\n" \ + " <method name=\"Terminate\"/>\n" \ + " <method name=\"Activate\"/>\n" \ + " <method name=\"Lock\"/>\n" \ + " <method name=\"Unlock\"/>\n" \ + " <method name=\"SetIdleHint\">\n" \ + " <arg name=\"b\" type=\"b\"/>\n" \ + " </method>\n" \ + " <method name=\"Kill\">\n" \ + " <arg name=\"who\" type=\"s\"/>\n" \ + " <arg name=\"signal\" type=\"s\"/>\n" \ + " </method>\n" \ + " <signal name=\"Lock\"/>\n" \ + " <signal name=\"Unlock\"/>\n" \ + " <property name=\"Id\" type=\"s\" access=\"read\"/>\n" \ + " <property name=\"User\" type=\"(uo)\" access=\"read\"/>\n" \ + " <property name=\"Name\" type=\"s\" 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=\"VTNr\" type=\"u\" access=\"read\"/>\n" \ + " <property name=\"Seat\" type=\"(so)\" access=\"read\"/>\n" \ + " <property name=\"TTY\" type=\"s\" access=\"read\"/>\n" \ + " <property name=\"Display\" type=\"s\" access=\"read\"/>\n" \ + " <property name=\"Remote\" type=\"b\" access=\"read\"/>\n" \ + " <property name=\"RemoteHost\" type=\"s\" access=\"read\"/>\n" \ + " <property name=\"RemoteUser\" type=\"s\" access=\"read\"/>\n" \ + " <property name=\"Service\" type=\"s\" access=\"read\"/>\n" \ + " <property name=\"Leader\" type=\"u\" access=\"read\"/>\n" \ + " <property name=\"Audit\" type=\"u\" access=\"read\"/>\n" \ + " <property name=\"Type\" type=\"s\" access=\"read\"/>\n" \ + " <property name=\"Class\" type=\"s\" access=\"read\"/>\n" \ + " <property name=\"Active\" type=\"b\" access=\"read\"/>\n" \ + " <property name=\"State\" type=\"s\" access=\"read\"/>\n" \ + " <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \ + " <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \ + " <property name=\"KillProcesses\" type=\"b\" access=\"read\"/>\n" \ + " <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n" \ + " <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \ + " <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \ + " </interface>\n" + +#define INTROSPECTION \ + DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE \ + "<node>\n" \ + BUS_SESSION_INTERFACE \ + BUS_PROPERTIES_INTERFACE \ + BUS_PEER_INTERFACE \ + BUS_INTROSPECTABLE_INTERFACE \ + "</node>\n" + +#define INTERFACES_LIST \ + BUS_GENERIC_INTERFACES_LIST \ + "org.freedesktop.login1.Session\0" + +static int bus_session_append_seat(DBusMessageIter *i, const char *property, void *data) { + DBusMessageIter sub; + Session *s = data; + const char *id, *path; + char *p = NULL; + + assert(i); + assert(property); + assert(s); + + if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub)) + return -ENOMEM; + + if (s->seat) { + id = s->seat->id; + path = p = seat_bus_path(s->seat); + + if (!p) + return -ENOMEM; + } else { + id = ""; + path = "/"; + } + + if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &id) || + !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &path)) + return -ENOMEM; + + if (!dbus_message_iter_close_container(i, &sub)) + return -ENOMEM; + + return 0; +} + +static int bus_session_append_user(DBusMessageIter *i, const char *property, void *data) { + DBusMessageIter sub; + User *u = data; + _cleanup_free_ char *p = NULL; + + assert(i); + assert(property); + assert(u); + + if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub)) + return -ENOMEM; + + p = user_bus_path(u); + if (!p) + return -ENOMEM; + + if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &u->uid) || + !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) + return -ENOMEM; + + if (!dbus_message_iter_close_container(i, &sub)) + return -ENOMEM; + + return 0; +} + +static int bus_session_append_active(DBusMessageIter *i, const char *property, void *data) { + Session *s = data; + dbus_bool_t b; + + assert(i); + assert(property); + assert(s); + + b = session_is_active(s); + if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b)) + return -ENOMEM; + + return 0; +} + +static int bus_session_append_idle_hint(DBusMessageIter *i, const char *property, void *data) { + Session *s = data; + int b; + + assert(i); + assert(property); + assert(s); + + b = session_get_idle_hint(s, NULL) > 0; + if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b)) + return -ENOMEM; + + return 0; +} + +static int bus_session_append_idle_hint_since(DBusMessageIter *i, const char *property, void *data) { + Session *s = data; + dual_timestamp t; + uint64_t u; + int r; + + assert(i); + assert(property); + assert(s); + + r = session_get_idle_hint(s, &t); + if (r < 0) + return r; + + u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic; + + if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u)) + return -ENOMEM; + + return 0; +} + +static int bus_session_append_default_cgroup(DBusMessageIter *i, const char *property, void *data) { + Session *s = data; + _cleanup_free_ char *t = NULL; + int r; + bool success; + + assert(i); + assert(property); + assert(s); + + r = cg_join_spec(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, &t); + if (r < 0) + return r; + + success = dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t); + return success ? 0 : -ENOMEM; +} + +static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_session_append_type, session_type, SessionType); +static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_session_append_class, session_class, SessionClass); + +static int bus_session_append_state(DBusMessageIter *i, const char *property, void *data) { + Session *s = data; + const char *state; + + assert(i); + assert(property); + assert(s); + + state = session_state_to_string(session_get_state(s)); + + if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state)) + return -ENOMEM; + + return 0; +} + +static int get_session_for_path(Manager *m, const char *path, Session **_s) { + Session *s; + char *id; + + assert(m); + assert(path); + assert(_s); + + if (!startswith(path, "/org/freedesktop/login1/session/")) + return -EINVAL; + + id = bus_path_unescape(path + 32); + if (!id) + return -ENOMEM; + + s = hashmap_get(m->sessions, id); + free(id); + + if (!s) + return -ENOENT; + + *_s = s; + return 0; +} + +static const BusProperty bus_login_session_properties[] = { + { "Id", bus_property_append_string, "s", offsetof(Session, id), true }, + { "Timestamp", bus_property_append_usec, "t", offsetof(Session, timestamp.realtime) }, + { "TimestampMonotonic", bus_property_append_usec, "t", offsetof(Session, timestamp.monotonic) }, + { "DefaultControlGroup", bus_session_append_default_cgroup, "s", 0, }, + { "VTNr", bus_property_append_uint32, "u", offsetof(Session, vtnr) }, + { "Seat", bus_session_append_seat, "(so)", 0 }, + { "TTY", bus_property_append_string, "s", offsetof(Session, tty), true }, + { "Display", bus_property_append_string, "s", offsetof(Session, display), true }, + { "Remote", bus_property_append_bool, "b", offsetof(Session, remote) }, + { "RemoteUser", bus_property_append_string, "s", offsetof(Session, remote_user), true }, + { "RemoteHost", bus_property_append_string, "s", offsetof(Session, remote_host), true }, + { "Service", bus_property_append_string, "s", offsetof(Session, service), true }, + { "Leader", bus_property_append_pid, "u", offsetof(Session, leader) }, + { "Audit", bus_property_append_uint32, "u", offsetof(Session, audit_id) }, + { "Type", bus_session_append_type, "s", offsetof(Session, type) }, + { "Class", bus_session_append_class, "s", offsetof(Session, class) }, + { "Active", bus_session_append_active, "b", 0 }, + { "State", bus_session_append_state, "s", 0 }, + { "Controllers", bus_property_append_strv, "as", offsetof(Session, controllers), true }, + { "ResetControllers", bus_property_append_strv, "as", offsetof(Session, reset_controllers), true }, + { "KillProcesses", bus_property_append_bool, "b", offsetof(Session, kill_processes) }, + { "IdleHint", bus_session_append_idle_hint, "b", 0 }, + { "IdleSinceHint", bus_session_append_idle_hint_since, "t", 0 }, + { "IdleSinceHintMonotonic", bus_session_append_idle_hint_since, "t", 0 }, + { NULL, } +}; + +static const BusProperty bus_login_session_user_properties[] = { + { "User", bus_session_append_user, "(uo)", 0 }, + { "Name", bus_property_append_string, "s", offsetof(User, name), true }, + { NULL, } +}; + +static DBusHandlerResult session_message_dispatch( + Session *s, + DBusConnection *connection, + DBusMessage *message) { + + DBusError error; + _cleanup_dbus_message_unref_ DBusMessage *reply = NULL; + int r; + + assert(s); + assert(connection); + assert(message); + + dbus_error_init(&error); + + if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Terminate")) { + + r = session_stop(s); + 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.Session", "Activate")) { + + r = session_activate(s); + 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.Session", "Lock") || + dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Unlock")) { + + if (session_send_lock(s, streq(dbus_message_get_member(message), "Lock")) < 0) + goto oom; + + reply = dbus_message_new_method_return(message); + if (!reply) + goto oom; + + } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "SetIdleHint")) { + dbus_bool_t b; + unsigned long ul; + + if (!dbus_message_get_args( + message, + &error, + DBUS_TYPE_BOOLEAN, &b, + DBUS_TYPE_INVALID)) + return bus_send_error_reply(connection, message, &error, -EINVAL); + + ul = dbus_bus_get_unix_user(connection, dbus_message_get_sender(message), &error); + if (ul == (unsigned long) -1) + return bus_send_error_reply(connection, message, &error, -EIO); + + if (ul != 0 && ul != s->user->uid) + return bus_send_error_reply(connection, message, NULL, -EPERM); + + session_set_idle_hint(s, b); + + reply = dbus_message_new_method_return(message); + if (!reply) + goto oom; + + } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "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 = session_kill(s, 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.Session", bus_login_session_properties, s }, + { "org.freedesktop.login1.Session", bus_login_session_user_properties, s->user }, + { 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 session_message_handler( + DBusConnection *connection, + DBusMessage *message, + void *userdata) { + + Manager *m = userdata; + Session *s; + int r; + + r = get_session_for_path(m, dbus_message_get_path(message), &s); + 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 session"); + return bus_send_error_reply(connection, message, &e, r); + } + + return bus_send_error_reply(connection, message, NULL, r); + } + + return session_message_dispatch(s, connection, message); +} + +const DBusObjectPathVTable bus_session_vtable = { + .message_function = session_message_handler +}; + +char *session_bus_path(Session *s) { + _cleanup_free_ char *t; + + assert(s); + + t = bus_path_escape(s->id); + if (!t) + return NULL; + + return strappend("/org/freedesktop/login1/session/", t); +} + +int session_send_signal(Session *s, bool new_session) { + _cleanup_dbus_message_unref_ DBusMessage *m = NULL; + _cleanup_free_ char *p = NULL; + + assert(s); + + m = dbus_message_new_signal("/org/freedesktop/login1", + "org.freedesktop.login1.Manager", + new_session ? "SessionNew" : "SessionRemoved"); + + if (!m) + return -ENOMEM; + + p = session_bus_path(s); + if (!p) + return -ENOMEM; + + if (!dbus_message_append_args( + m, + DBUS_TYPE_STRING, &s->id, + DBUS_TYPE_OBJECT_PATH, &p, + DBUS_TYPE_INVALID)) + return -ENOMEM; + + if (!dbus_connection_send(s->manager->bus, m, NULL)) + return -ENOMEM; + + return 0; +} + +int session_send_changed(Session *s, const char *properties) { + _cleanup_dbus_message_unref_ DBusMessage *m = NULL; + _cleanup_free_ char *p = NULL; + + assert(s); + + if (!s->started) + return 0; + + p = session_bus_path(s); + if (!p) + return -ENOMEM; + + m = bus_properties_changed_new(p, "org.freedesktop.login1.Session", properties); + if (!m) + return -ENOMEM; + + if (!dbus_connection_send(s->manager->bus, m, NULL)) + return -ENOMEM; + + return 0; +} + +int session_send_lock(Session *s, bool lock) { + _cleanup_dbus_message_unref_ DBusMessage *m = NULL; + bool b; + _cleanup_free_ char *p = NULL; + + assert(s); + + p = session_bus_path(s); + if (!p) + return -ENOMEM; + + m = dbus_message_new_signal(p, "org.freedesktop.login1.Session", lock ? "Lock" : "Unlock"); + + if (!m) + return -ENOMEM; + + b = dbus_connection_send(s->manager->bus, m, NULL); + if (!b) + return -ENOMEM; + + return 0; +} + +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; +} |