/*-*- 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 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 <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" \ " <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=\"ControlGroupPath\" 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=\"Active\" type=\"b\" 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)) { free(p); return -ENOMEM; } free(p); 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; Session *s = data; char *p = NULL; assert(i); assert(property); assert(s); if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub)) return -ENOMEM; p = user_bus_path(s->user); if (!p) return -ENOMEM; if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &s->user->uid) || !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; } 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; assert(i); assert(property); assert(s); session_get_idle_hint(s, &t); u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic; if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u)) return -ENOMEM; return 0; } static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_session_append_type, session_type, SessionType); 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 DBusHandlerResult session_message_dispatch( Session *s, DBusConnection *connection, DBusMessage *message) { const BusProperty properties[] = { { "org.freedesktop.login1.Session", "Id", bus_property_append_string, "s", s->id }, { "org.freedesktop.login1.Session", "User", bus_session_append_user, "(uo)", s }, { "org.freedesktop.login1.Session", "Name", bus_property_append_string, "s", s->user->name }, { "org.freedesktop.login1.Session", "Timestamp", bus_property_append_usec, "t", &s->timestamp.realtime }, { "org.freedesktop.login1.Session", "TimestampMonotonic", bus_property_append_usec, "t", &s->timestamp.monotonic }, { "org.freedesktop.login1.Session", "ControlGroupPath", bus_property_append_string, "s", s->cgroup_path }, { "org.freedesktop.login1.Session", "VTNr", bus_property_append_uint32, "u", &s->vtnr }, { "org.freedesktop.login1.Session", "Seat", bus_session_append_seat, "(so)", s }, { "org.freedesktop.login1.Session", "TTY", bus_property_append_string, "s", s->tty }, { "org.freedesktop.login1.Session", "Display", bus_property_append_string, "s", s->display }, { "org.freedesktop.login1.Session", "Remote", bus_property_append_bool, "b", &s->remote }, { "org.freedesktop.login1.Session", "RemoteUser", bus_property_append_string, "s", s->remote_user }, { "org.freedesktop.login1.Session", "RemoteHost", bus_property_append_string, "s", s->remote_host }, { "org.freedesktop.login1.Session", "Service", bus_property_append_string, "s", s->service }, { "org.freedesktop.login1.Session", "Leader", bus_property_append_pid, "u", &s->leader }, { "org.freedesktop.login1.Session", "Audit", bus_property_append_uint32, "u", &s->audit_id }, { "org.freedesktop.login1.Session", "Type", bus_session_append_type, "s", &s->type }, { "org.freedesktop.login1.Session", "Active", bus_session_append_active, "b", s }, { "org.freedesktop.login1.Session", "Controllers", bus_property_append_strv, "as", s->controllers }, { "org.freedesktop.login1.Session", "ResetControllers", bus_property_append_strv, "as", s->reset_controllers }, { "org.freedesktop.login1.Session", "KillProcesses", bus_property_append_bool, "b", &s->kill_processes }, { "org.freedesktop.login1.Session", "IdleHint", bus_session_append_idle_hint, "b", s }, { "org.freedesktop.login1.Session", "IdleSinceHint", bus_session_append_idle_hint_since, "t", s }, { "org.freedesktop.login1.Session", "IdleSinceHintMonotonic", bus_session_append_idle_hint_since, "t", s }, { NULL, NULL, NULL, NULL, NULL } }; DBusError error; 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_signal(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 return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties); if (reply) { if (!dbus_connection_send(connection, reply, NULL)) goto oom; dbus_message_unref(reply); } return DBUS_HANDLER_RESULT_HANDLED; oom: if (reply) dbus_message_unref(reply); 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) { char *t, *r; assert(s); t = bus_path_escape(s->id); if (!t) return NULL; r = strappend("/org/freedesktop/login1/session/", t); free(t); return r; } int session_send_signal(Session *s, bool new_session) { DBusMessage *m; int r = -ENOMEM; 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) goto finish; if (!dbus_message_append_args( m, DBUS_TYPE_STRING, &s->id, DBUS_TYPE_OBJECT_PATH, &p, DBUS_TYPE_INVALID)) goto finish; if (!dbus_connection_send(s->manager->bus, m, NULL)) goto finish; r = 0; finish: dbus_message_unref(m); free(p); return r; } int session_send_changed(Session *s, const char *properties) { DBusMessage *m; int r = -ENOMEM; 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) goto finish; if (!dbus_connection_send(s->manager->bus, m, NULL)) goto finish; r = 0; finish: if (m) dbus_message_unref(m); free(p); return r; } int session_send_lock(Session *s, bool lock) { DBusMessage *m; bool b; char *p; assert(s); p = session_bus_path(s); if (!p) return -ENOMEM; m = dbus_message_new_signal(p, "org.freedesktop.login1.Session", lock ? "Lock" : "Unlock"); free(p); if (!m) return -ENOMEM; b = dbus_connection_send(s->manager->bus, m, NULL); dbus_message_unref(m); if (!b) return -ENOMEM; return 0; }