src/logind-session-dbus.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23
  24 #include "logind.h"
  25 #include "logind-session.h"
  26 #include "dbus-common.h"
  27 #include "util.h"
  28
  29 #define BUS_SESSION_INTERFACE \
  30         " <interface name=\"org.freedesktop.login1.Session\">\n"        \
  31         "  <method name=\"Terminate\"/>\n"                              \
  32         "  <method name=\"Activate\"/>\n"                               \
  33         "  <method name=\"Lock\"/>\n"                                   \
  34         "  <method name=\"Unlock\"/>\n"                                 \
  35         "  <method name=\"SetIdleHint\">\n"                             \
  36         "   <arg name=\"b\" type=\"b\"/>\n"                             \
  37         "  </method>\n"                                                 \
  38         "  <property name=\"Id\" type=\"u\" access=\"read\"/>\n"        \
  39         "  <property name=\"User\" type=\"(uo)\" access=\"read\"/>\n"   \
  40         "  <property name=\"Name\" type=\"s\" access=\"read\"/>\n"      \
  41         "  <property name=\"Timestamp\" type=\"t\" access=\"read\"/>\n" \
  42         "  <property name=\"TimestampMonotonic\" type=\"t\" access=\"read\"/>\n" \
  43         "  <property name=\"ControlGroupPath\" type=\"s\" access=\"read\"/>\n" \
  44         "  <property name=\"VTNr\" type=\"u\" access=\"read\"/>\n"      \
  45         "  <property name=\"Seat\" type=\"(so)\" access=\"read\"/>\n"   \
  46         "  <property name=\"TTY\" type=\"s\" access=\"read\"/>\n"       \
  47         "  <property name=\"Display\" type=\"s\" access=\"read\"/>\n"   \
  48         "  <property name=\"Remote\" type=\"b\" access=\"read\"/>\n"    \
  49         "  <property name=\"RemoteHost\" type=\"s\" access=\"read\"/>\n" \
  50         "  <property name=\"RemoteUser\" type=\"s\" access=\"read\"/>\n" \
  51         "  <property name=\"Leader\" type=\"u\" access=\"read\"/>\n"    \
  52         "  <property name=\"Audit\" type=\"u\" access=\"read\"/>\n"     \
  53         "  <property name=\"Type\" type=\"s\" access=\"read\"/>\n"      \
  54         "  <property name=\"Active\" type=\"b\" access=\"read\"/>\n"    \
  55         "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
  56         "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
  57         "  <property name=\"KillProcesses\" type=\"b\" access=\"read\"/>\n" \
  58         "  <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n"  \
  59         "  <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \
  60         "  <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \
  61         " </interface>\n"
  62
  63 #define INTROSPECTION                                                   \
  64         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
  65         "<node>\n"                                                      \
  66         BUS_SESSION_INTERFACE                                           \
  67         BUS_PROPERTIES_INTERFACE                                        \
  68         BUS_PEER_INTERFACE                                              \
  69         BUS_INTROSPECTABLE_INTERFACE                                    \
  70         "</node>\n"
  71
  72 #define INTERFACES_LIST                              \
  73         BUS_GENERIC_INTERFACES_LIST                  \
  74         "org.freedesktop.login1.Session\0"
  75
  76 static int bus_session_append_seat(DBusMessageIter *i, const char *property, void *data) {
  77         DBusMessageIter sub;
  78         Session *s = data;
  79         const char *id, *path;
  80         char *p = NULL;
  81
  82         assert(i);
  83         assert(property);
  84         assert(s);
  85
  86         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
  87                 return -ENOMEM;
  88
  89         if (s->seat) {
  90                 id = s->seat->id;
  91                 path = p = seat_bus_path(s->seat);
  92
  93                 if (!p)
  94                         return -ENOMEM;
  95         } else {
  96                 id = "";
  97                 path = "/";
  98         }
  99
 100         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &id) ||
 101             !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &path)) {
 102                 free(p);
 103                 return -ENOMEM;
 104         }
 105
 106         free(p);
 107
 108         if (!dbus_message_iter_close_container(i, &sub))
 109                 return -ENOMEM;
 110
 111         return 0;
 112 }
 113
 114 static int bus_session_append_user(DBusMessageIter *i, const char *property, void *data) {
 115         DBusMessageIter sub;
 116         Session *s = data;
 117         char *p = NULL;
 118
 119         assert(i);
 120         assert(property);
 121         assert(s);
 122
 123         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
 124                 return -ENOMEM;
 125
 126         p = user_bus_path(s->user);
 127         if (!p)
 128                 return -ENOMEM;
 129
 130         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &s->user->uid) ||
 131             !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
 132                 free(p);
 133                 return -ENOMEM;
 134         }
 135
 136         free(p);
 137
 138         if (!dbus_message_iter_close_container(i, &sub))
 139                 return -ENOMEM;
 140
 141         return 0;
 142 }
 143
 144 static int bus_session_append_active(DBusMessageIter *i, const char *property, void *data) {
 145         Session *s = data;
 146         bool b;
 147
 148         assert(i);
 149         assert(property);
 150         assert(s);
 151
 152         b = session_is_active(s);
 153         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 154                 return -ENOMEM;
 155
 156         return 0;
 157 }
 158
 159 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_session_append_type, session_type, SessionType);
 160
 161 static int get_session_for_path(Manager *m, const char *path, Session **_s) {
 162         Session *s;
 163         char *id;
 164
 165         assert(m);
 166         assert(path);
 167         assert(_s);
 168
 169         if (!startswith(path, "/org/freedesktop/login1/session/"))
 170                 return -EINVAL;
 171
 172         id = bus_path_unescape(path + 32);
 173         if (!id)
 174                 return -ENOMEM;
 175
 176         s = hashmap_get(m->sessions, id);
 177         free(id);
 178
 179         if (!s)
 180                 return -ENOENT;
 181
 182         *_s = s;
 183         return 0;
 184 }
 185
 186 static DBusHandlerResult session_message_dispatch(
 187                 Session *s,
 188                 DBusConnection *connection,
 189                 DBusMessage *message) {
 190
 191         const BusProperty properties[] = {
 192                 { "org.freedesktop.login1.Session", "Id",               bus_property_append_string, "s",    s->id                },
 193                 { "org.freedesktop.login1.Session", "User",             bus_session_append_user,    "(uo)", s                    },
 194                 { "org.freedesktop.login1.Session", "Name",             bus_property_append_string, "s",    s->user->name        },
 195                 { "org.freedesktop.login1.Session", "ControlGroupPath", bus_property_append_string, "s",    s->cgroup_path       },
 196                 { "org.freedesktop.login1.Session", "VTNr",             bus_property_append_uint32, "u",    &s->vtnr             },
 197                 { "org.freedesktop.login1.Session", "Seat",             bus_session_append_seat,    "(so)", s                    },
 198                 { "org.freedesktop.login1.Session", "TTY",              bus_property_append_string, "s",    s->tty               },
 199                 { "org.freedesktop.login1.Session", "Display",          bus_property_append_string, "s",    s->display           },
 200                 { "org.freedesktop.login1.Session", "Remote",           bus_property_append_bool,   "b",    &s->remote           },
 201                 { "org.freedesktop.login1.Session", "RemoteUser",       bus_property_append_string, "s",    s->remote_user       },
 202                 { "org.freedesktop.login1.Session", "RemoteHost",       bus_property_append_string, "s",    s->remote_host       },
 203                 { "org.freedesktop.login1.Session", "Leader",           bus_property_append_pid,    "u",    &s->leader           },
 204                 { "org.freedesktop.login1.Session", "Audit",            bus_property_append_uint32, "u",    &s->audit_id         },
 205                 { "org.freedesktop.login1.Session", "Type",             bus_session_append_type,    "s",    &s->type             },
 206                 { "org.freedesktop.login1.Session", "Active",           bus_session_append_active,  "b",    s                    },
 207                 { "org.freedesktop.login1.Session", "Controllers",      bus_property_append_strv,   "as",   s->controllers       },
 208                 { "org.freedesktop.login1.Session", "ResetControllers", bus_property_append_strv,   "as",   s->reset_controllers },
 209                 { "org.freedesktop.login1.Session", "KillProcesses",    bus_property_append_bool,   "b",    &s->kill_processes   },
 210                 { NULL, NULL, NULL, NULL, NULL }
 211         };
 212
 213         assert(s);
 214         assert(connection);
 215         assert(message);
 216
 217         return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties);
 218 }
 219
 220 static DBusHandlerResult session_message_handler(
 221                 DBusConnection *connection,
 222                 DBusMessage *message,
 223                 void *userdata) {
 224
 225         Manager *m = userdata;
 226         Session *s;
 227         int r;
 228
 229         r = get_session_for_path(m, dbus_message_get_path(message), &s);
 230         if (r < 0) {
 231
 232                 if (r == -ENOMEM)
 233                         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 234
 235                 if (r == -ENOENT) {
 236                         DBusError e;
 237
 238                         dbus_error_init(&e);
 239                         dbus_set_error_const(&e, DBUS_ERROR_UNKNOWN_OBJECT, "Unknown session");
 240                         return bus_send_error_reply(connection, message, &e, r);
 241                 }
 242
 243                 return bus_send_error_reply(connection, message, NULL, r);
 244         }
 245
 246         return session_message_dispatch(s, connection, message);
 247 }
 248
 249 const DBusObjectPathVTable bus_session_vtable = {
 250         .message_function = session_message_handler
 251 };
 252
 253 char *session_bus_path(Session *s) {
 254         char *t, *r;
 255
 256         assert(s);
 257
 258         t = bus_path_escape(s->id);
 259         if (!t)
 260                 return NULL;
 261
 262         r = strappend("/org/freedesktop/login1/session/", t);
 263         free(t);
 264
 265         return r;
 266 }