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         "  <property name=\"Id\" type=\"u\" access=\"read\"/>\n"        \
  34         "  <property name=\"User\" type=\"(uo)\" access=\"read\"/>\n"   \
  35         "  <property name=\"Name\" type=\"s\" access=\"read\"/>\n"      \
  36         "  <property name=\"ControlGroupPath\" type=\"s\" access=\"read\"/>\n" \
  37         "  <property name=\"VTNr\" type=\"u\" access=\"read\"/>\n"      \
  38         "  <property name=\"Seat\" type=\"(so)\" access=\"read\"/>\n"   \
  39         "  <property name=\"TTY\" type=\"s\" access=\"read\"/>\n"       \
  40         "  <property name=\"Display\" type=\"s\" access=\"read\"/>\n"   \
  41         "  <property name=\"Remote\" type=\"b\" access=\"read\"/>\n"    \
  42         "  <property name=\"RemoteHost\" type=\"s\" access=\"read\"/>\n" \
  43         "  <property name=\"RemoteUser\" type=\"s\" access=\"read\"/>\n" \
  44         "  <property name=\"Leader\" type=\"u\" access=\"read\"/>\n"    \
  45         "  <property name=\"Audit\" type=\"u\" access=\"read\"/>\n"     \
  46         "  <property name=\"Type\" type=\"s\" access=\"read\"/>\n"      \
  47         "  <property name=\"Active\" type=\"b\" access=\"read\"/>\n"    \
  48         "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
  49         "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
  50         "  <property name=\"KillProcesses\" type=\"b\" access=\"read\"/>\n" \
  51         " </interface>\n"
  52
  53 #define INTROSPECTION                                                   \
  54         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
  55         "<node>\n"                                                      \
  56         BUS_SESSION_INTERFACE                                           \
  57         BUS_PROPERTIES_INTERFACE                                        \
  58         BUS_PEER_INTERFACE                                              \
  59         BUS_INTROSPECTABLE_INTERFACE                                    \
  60         "</node>\n"
  61
  62 #define INTERFACES_LIST                              \
  63         BUS_GENERIC_INTERFACES_LIST                  \
  64         "org.freedesktop.login1.Session\0"
  65
  66 static int bus_session_append_seat(DBusMessageIter *i, const char *property, void *data) {
  67         DBusMessageIter sub;
  68         Session *s = data;
  69         const char *id, *path;
  70         char *p = NULL;
  71
  72         assert(i);
  73         assert(property);
  74         assert(s);
  75
  76         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
  77                 return -ENOMEM;
  78
  79         if (s->seat) {
  80                 id = s->seat->id;
  81                 path = p = seat_bus_path(s->seat);
  82
  83                 if (!p)
  84                         return -ENOMEM;
  85         } else {
  86                 id = "";
  87                 path = "/";
  88         }
  89
  90         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &id) ||
  91             !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &path)) {
  92                 free(p);
  93                 return -ENOMEM;
  94         }
  95
  96         free(p);
  97
  98         if (!dbus_message_iter_close_container(i, &sub))
  99                 return -ENOMEM;
 100
 101         return 0;
 102 }
 103
 104 static int bus_session_append_user(DBusMessageIter *i, const char *property, void *data) {
 105         DBusMessageIter sub;
 106         Session *s = data;
 107         char *p = NULL;
 108
 109         assert(i);
 110         assert(property);
 111         assert(s);
 112
 113         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
 114                 return -ENOMEM;
 115
 116         p = user_bus_path(s->user);
 117         if (!p)
 118                 return -ENOMEM;
 119
 120         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &s->user->uid) ||
 121             !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
 122                 free(p);
 123                 return -ENOMEM;
 124         }
 125
 126         free(p);
 127
 128         if (!dbus_message_iter_close_container(i, &sub))
 129                 return -ENOMEM;
 130
 131         return 0;
 132 }
 133
 134 static int bus_session_append_active(DBusMessageIter *i, const char *property, void *data) {
 135         Session *s = data;
 136         bool b;
 137
 138         assert(i);
 139         assert(property);
 140         assert(s);
 141
 142         b = session_is_active(s);
 143         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 144                 return -ENOMEM;
 145
 146         return 0;
 147 }
 148
 149 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_session_append_type, session_type, SessionType);
 150
 151 static int get_session_for_path(Manager *m, const char *path, Session **_s) {
 152         Session *s;
 153         char *id;
 154
 155         assert(m);
 156         assert(path);
 157         assert(_s);
 158
 159         if (!startswith(path, "/org/freedesktop/login1/session/"))
 160                 return -EINVAL;
 161
 162         id = bus_path_unescape(path + 32);
 163         if (!id)
 164                 return -ENOMEM;
 165
 166         s = hashmap_get(m->sessions, id);
 167         free(id);
 168
 169         if (!s)
 170                 return -ENOENT;
 171
 172         *_s = s;
 173         return 0;
 174 }
 175
 176 static DBusHandlerResult session_message_dispatch(
 177                 Session *s,
 178                 DBusConnection *connection,
 179                 DBusMessage *message) {
 180
 181         const BusProperty properties[] = {
 182                 { "org.freedesktop.login1.Session", "Id",               bus_property_append_string, "s",    s->id                },
 183                 { "org.freedesktop.login1.Session", "User",             bus_session_append_user,    "(uo)", s                    },
 184                 { "org.freedesktop.login1.Session", "Name",             bus_property_append_string, "s",    s->user->name        },
 185                 { "org.freedesktop.login1.Session", "ControlGroupPath", bus_property_append_string, "s",    s->cgroup_path       },
 186                 { "org.freedesktop.login1.Session", "VTNr",             bus_property_append_uint32, "u",    &s->vtnr             },
 187                 { "org.freedesktop.login1.Session", "Seat",             bus_session_append_seat,    "(so)", s                    },
 188                 { "org.freedesktop.login1.Session", "TTY",              bus_property_append_string, "s",    s->tty               },
 189                 { "org.freedesktop.login1.Session", "Display",          bus_property_append_string, "s",    s->display           },
 190                 { "org.freedesktop.login1.Session", "Remote",           bus_property_append_bool,   "b",    &s->remote           },
 191                 { "org.freedesktop.login1.Session", "RemoteUser",       bus_property_append_string, "s",    s->remote_user       },
 192                 { "org.freedesktop.login1.Session", "RemoteHost",       bus_property_append_string, "s",    s->remote_host       },
 193                 { "org.freedesktop.login1.Session", "Leader",           bus_property_append_pid,    "u",    &s->leader           },
 194                 { "org.freedesktop.login1.Session", "Audit",            bus_property_append_uint32, "u",    &s->audit_id         },
 195                 { "org.freedesktop.login1.Session", "Type",             bus_session_append_type,    "s",    &s->type             },
 196                 { "org.freedesktop.login1.Session", "Active",           bus_session_append_active,  "b",    s                    },
 197                 { "org.freedesktop.login1.Session", "Controllers",      bus_property_append_strv,   "as",   s->controllers       },
 198                 { "org.freedesktop.login1.Session", "ResetControllers", bus_property_append_strv,   "as",   s->reset_controllers },
 199                 { "org.freedesktop.login1.Session", "KillProcesses",    bus_property_append_bool,   "b",    &s->kill_processes   },
 200                 { NULL, NULL, NULL, NULL, NULL }
 201         };
 202
 203         assert(s);
 204         assert(connection);
 205         assert(message);
 206
 207         return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties);
 208 }
 209
 210 static DBusHandlerResult session_message_handler(
 211                 DBusConnection *connection,
 212                 DBusMessage *message,
 213                 void *userdata) {
 214
 215         Manager *m = userdata;
 216         Session *s;
 217         int r;
 218
 219         r = get_session_for_path(m, dbus_message_get_path(message), &s);
 220         if (r < 0) {
 221
 222                 if (r == -ENOMEM)
 223                         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 224
 225                 if (r == -ENOENT) {
 226                         DBusError e;
 227
 228                         dbus_error_init(&e);
 229                         dbus_set_error_const(&e, DBUS_ERROR_UNKNOWN_OBJECT, "Unknown session");
 230                         return bus_send_error_reply(connection, message, &e, r);
 231                 }
 232
 233                 return bus_send_error_reply(connection, message, NULL, r);
 234         }
 235
 236         return session_message_dispatch(s, connection, message);
 237 }
 238
 239 const DBusObjectPathVTable bus_session_vtable = {
 240         .message_function = session_message_handler
 241 };
 242
 243 char *session_bus_path(Session *s) {
 244         char *t, *r;
 245
 246         assert(s);
 247
 248         t = bus_path_escape(s->id);
 249         if (!t)
 250                 return NULL;
 251
 252         r = strappend("/org/freedesktop/login1/session/", t);
 253         free(t);
 254
 255         return r;
 256 }