src/logind-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 #include <string.h>
  24
  25 #include "logind.h"
  26 #include "dbus-common.h"
  27
  28 #define BUS_MANAGER_INTERFACE                                           \
  29         " <interface name=\"org.freedesktop.login1.Manager\">\n"        \
  30         "  <method name=\"GetSeat\">\n"                                 \
  31         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  32         "   <arg name=\"seat\" type=\"o\" direction=\"out\"/>\n"        \
  33         "  </method>\n"                                                 \
  34         "  <method name=\"GetUser\">\n"                                 \
  35         "   <arg name=\"uid\" type=\"t\" direction=\"in\"/>\n"          \
  36         "   <arg name=\"user\" type=\"o\" direction=\"out\"/>\n"        \
  37         "  </method>\n"                                                 \
  38         "  <method name=\"GetSession\">\n"                              \
  39         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  40         "   <arg name=\"session\" type=\"o\" direction=\"out\"/>\n"     \
  41         "  </method>\n"                                                 \
  42         "  <method name=\"ListSeats\">\n"                               \
  43         "   <arg name=\"seats\" type=\"a(so)\" direction=\"out\"/>\n"   \
  44         "  </method>\n"                                                 \
  45         "  <method name=\"ListUsers\">\n"                               \
  46         "   <arg name=\"users\" type=\"a(uso)\" direction=\"out\"/>\n"  \
  47         "  </method>\n"                                                 \
  48         "  <method name=\"ListSessions\">\n"                            \
  49         "   <arg name=\"users\" type=\"a(sussso)\" direction=\"out\"/>\n" \
  50         "  </method>\n"                                                 \
  51         "  <method name=\"CreateSession\">\n"                           \
  52         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  53         "   <arg name=\"leader\" type=\"u\" direction=\"in\"/>\n"       \
  54         "   <arg name=\"type\" type=\"s\" direction=\"in\"/>\n"         \
  55         "   <arg name=\"seat\" type=\"s\" direction=\"in\"/>\n"         \
  56         "   <arg name=\"tty\" type=\"s\" direction=\"in\"/>\n"          \
  57         "   <arg name=\"display\" type=\"s\" direction=\"in\"/>\n"      \
  58         "   <arg name=\"remote\" type=\"b\" direction=\"in\"/>\n"       \
  59         "   <arg name=\"remote_user\" type=\"s\" direction=\"in\"/>\n"  \
  60         "   <arg name=\"remote_host\" type=\"s\" direction=\"in\"/>\n"  \
  61         "   <arg name=\"controllers\" type=\"as\" direction=\"in\"/>\n" \
  62         "   <arg name=\"reset_controllers\" type=\"as\" direction=\"in\"/>\n" \
  63         "   <arg name=\"kill_processes\" type=\"as\" direction=\"in\"/>\n" \
  64         "   <arg name=\"id\" type=\"s\" direction=\"out\"/>\n"          \
  65         "   <arg name=\"path\" type=\"o\" direction=\"out\"/>\n"        \
  66         "   <arg name=\"fd\" type=\"h\" direction=\"out\"/>\n"          \
  67         "  </method>\n"                                                 \
  68         "  <method name=\"ActivateSession\">\n"                         \
  69         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  70         "  </method>\n"                                                 \
  71         "  <method name=\"TerminateSession\">\n"                        \
  72         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  73         "  </method>\n"                                                 \
  74         "  <method name=\"TerminateUser\">\n"                           \
  75         "   <arg name=\"uid\" type=\"t\" direction=\"in\"/>\n"          \
  76         "  </method>\n"                                                 \
  77         "  <method name=\"TerminateSeat\">\n"                           \
  78         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  79         "  </method>\n"                                                 \
  80         "  <signal name=\"SessionNew\">\n"                              \
  81         "   <arg name=\"id\" type=\"s\"/>\n"                            \
  82         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  83         "  </signal>\n"                                                 \
  84         "  <signal name=\"SessionRemoved\">\n"                          \
  85         "   <arg name=\"id\" type=\"s\"/>\n"                            \
  86         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  87         "  </signal>\n"                                                 \
  88         "  <signal name=\"UserNew\">\n"                                 \
  89         "   <arg name=\"uid\" type=\"u\"/>\n"                           \
  90         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  91         "  </signal>\n"                                                 \
  92         "  <signal name=\"UserRemoved\">\n"                             \
  93         "   <arg name=\"uid\" type=\"u\"/>\n"                           \
  94         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  95         "  </signal>\n"                                                 \
  96         "  <signal name=\"SeatNew\">\n"                                 \
  97         "   <arg name=\"id\" type=\"s\"/>\n"                            \
  98         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  99         "  </signal>\n"                                                 \
 100         "  <signal name=\"SeatRemoved\">\n"                             \
 101         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 102         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 103         "  </signal>\n"                                                 \
 104         "  <property name=\"ControlGroupHierarchy\" type=\"s\" access=\"read\"/>\n" \
 105         "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
 106         "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
 107         "  <property name=\"NAutoVTs\" type=\"u\" access=\"read\"/>\n" \
 108         "  <property name=\"KillOnlyUsers\" type=\"as\" access=\"read\"/>\n" \
 109         "  <property name=\"KillExcludeUsers\" type=\"as\" access=\"read\"/>\n" \
 110         "  <property name=\"KillUserProcesses\" type=\"b\" access=\"read\"/>\n" \
 111         "  <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n"  \
 112         "  <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \
 113         "  <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \
 114         " </interface>\n"
 115
 116 #define INTROSPECTION_BEGIN                                             \
 117         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
 118         "<node>\n"                                                      \
 119         BUS_MANAGER_INTERFACE                                           \
 120         BUS_PROPERTIES_INTERFACE                                        \
 121         BUS_PEER_INTERFACE                                              \
 122         BUS_INTROSPECTABLE_INTERFACE
 123
 124 #define INTROSPECTION_END                                               \
 125         "</node>\n"
 126
 127 #define INTERFACES_LIST                              \
 128         BUS_GENERIC_INTERFACES_LIST                  \
 129         "org.freedesktop.login1.Manager\0"
 130
 131 static int bus_manager_append_idle_hint(DBusMessageIter *i, const char *property, void *data) {
 132         Manager *m = data;
 133         bool b;
 134
 135         assert(i);
 136         assert(property);
 137         assert(m);
 138
 139         b = manager_get_idle_hint(m, NULL);
 140         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 141                 return -ENOMEM;
 142
 143         return 0;
 144 }
 145
 146 static int bus_manager_append_idle_hint_since(DBusMessageIter *i, const char *property, void *data) {
 147         Manager *m = data;
 148         dual_timestamp t;
 149         uint64_t u;
 150
 151         assert(i);
 152         assert(property);
 153         assert(m);
 154
 155         manager_get_idle_hint(m, &t);
 156         u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 157
 158         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
 159                 return -ENOMEM;
 160
 161         return 0;
 162 }
 163
 164 static DBusHandlerResult manager_message_handler(
 165                 DBusConnection *connection,
 166                 DBusMessage *message,
 167                 void *userdata) {
 168
 169         Manager *m = userdata;
 170
 171         const BusProperty properties[] = {
 172                 { "org.freedesktop.login1.Manager", "ControlGroupHierarchy",  bus_property_append_string,   "s",  m->cgroup_path          },
 173                 { "org.freedesktop.login1.Manager", "Controllers",            bus_property_append_strv,     "as", m->controllers          },
 174                 { "org.freedesktop.login1.Manager", "ResetControllers",       bus_property_append_strv,     "as", m->reset_controllers    },
 175                 { "org.freedesktop.login1.Manager", "NAutoVTs",               bus_property_append_unsigned, "u",  &m->n_autovts           },
 176                 { "org.freedesktop.login1.Manager", "KillOnlyUsers",          bus_property_append_strv,     "as", m->kill_only_users      },
 177                 { "org.freedesktop.login1.Manager", "KillExcludeUsers",       bus_property_append_strv,     "as", m->kill_exclude_users   },
 178                 { "org.freedesktop.login1.Manager", "KillUserProcesses",      bus_property_append_bool,     "b",  &m->kill_user_processes },
 179                 { "org.freedesktop.login1.Manager", "IdleHint",               bus_manager_append_idle_hint, "b",  m                       },
 180                 { "org.freedesktop.login1.Manager", "IdleSinceHint",          bus_manager_append_idle_hint_since, "t", m                  },
 181                 { "org.freedesktop.login1.Manager", "IdleSinceHintMonotonic", bus_manager_append_idle_hint_since, "t", m                  },
 182                 { NULL, NULL, NULL, NULL, NULL }
 183         };
 184
 185         DBusError error;
 186         DBusMessage *reply = NULL;
 187
 188         assert(connection);
 189         assert(message);
 190         assert(m);
 191
 192         dbus_error_init(&error);
 193
 194         if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
 195                 char *introspection = NULL;
 196                 FILE *f;
 197                 Iterator i;
 198                 Session *session;
 199                 Seat *seat;
 200                 User *user;
 201                 size_t size;
 202                 char *p;
 203
 204                 if (!(reply = dbus_message_new_method_return(message)))
 205                         goto oom;
 206
 207                 /* We roll our own introspection code here, instead of
 208                  * relying on bus_default_message_handler() because we
 209                  * need to generate our introspection string
 210                  * dynamically. */
 211
 212                 if (!(f = open_memstream(&introspection, &size)))
 213                         goto oom;
 214
 215                 fputs(INTROSPECTION_BEGIN, f);
 216
 217                 HASHMAP_FOREACH(seat, m->seats, i) {
 218                         p = bus_path_escape(seat->id);
 219
 220                         if (p) {
 221                                 fprintf(f, "<node name=\"seat/%s\"/>", p);
 222                                 free(p);
 223                         }
 224                 }
 225
 226                 HASHMAP_FOREACH(user, m->users, i)
 227                         fprintf(f, "<node name=\"user/%llu\"/>", (unsigned long long) user->uid);
 228
 229                 HASHMAP_FOREACH(session, m->sessions, i) {
 230                         p = bus_path_escape(session->id);
 231
 232                         if (p) {
 233                                 fprintf(f, "<node name=\"session/%s\"/>", p);
 234                                 free(p);
 235                         }
 236                 }
 237
 238                 fputs(INTROSPECTION_END, f);
 239
 240                 if (ferror(f)) {
 241                         fclose(f);
 242                         free(introspection);
 243                         goto oom;
 244                 }
 245
 246                 fclose(f);
 247
 248                 if (!introspection)
 249                         goto oom;
 250
 251                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
 252                         free(introspection);
 253                         goto oom;
 254                 }
 255
 256                 free(introspection);
 257         } else
 258                 return bus_default_message_handler(connection, message, NULL, INTERFACES_LIST, properties);
 259
 260         if (reply) {
 261                 if (!dbus_connection_send(connection, reply, NULL))
 262                         goto oom;
 263
 264                 dbus_message_unref(reply);
 265         }
 266
 267         return DBUS_HANDLER_RESULT_HANDLED;
 268
 269 oom:
 270         if (reply)
 271                 dbus_message_unref(reply);
 272
 273         dbus_error_free(&error);
 274
 275         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 276 }
 277
 278 const DBusObjectPathVTable bus_manager_vtable = {
 279         .message_function = manager_message_handler
 280 };