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