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 #include <string.h>
  24
  25 #include "logind.h"
  26 #include "logind-session.h"
  27 #include "dbus-common.h"
  28 #include "util.h"
  29
  30 #define BUS_SESSION_INTERFACE \
  31         " <interface name=\"org.freedesktop.login1.Session\">\n"        \
  32         "  <method name=\"Terminate\"/>\n"                              \
  33         "  <method name=\"Activate\"/>\n"                               \
  34         "  <method name=\"Lock\"/>\n"                                   \
  35         "  <method name=\"Unlock\"/>\n"                                 \
  36         "  <method name=\"SetIdleHint\">\n"                             \
  37         "   <arg name=\"b\" type=\"b\"/>\n"                             \
  38         "  </method>\n"                                                 \
  39         "  <property name=\"Id\" type=\"u\" access=\"read\"/>\n"        \
  40         "  <property name=\"User\" type=\"(uo)\" access=\"read\"/>\n"   \
  41         "  <property name=\"Name\" type=\"s\" access=\"read\"/>\n"      \
  42         "  <property name=\"Timestamp\" type=\"t\" access=\"read\"/>\n" \
  43         "  <property name=\"TimestampMonotonic\" type=\"t\" access=\"read\"/>\n" \
  44         "  <property name=\"ControlGroupPath\" type=\"s\" access=\"read\"/>\n" \
  45         "  <property name=\"VTNr\" type=\"u\" access=\"read\"/>\n"      \
  46         "  <property name=\"Seat\" type=\"(so)\" access=\"read\"/>\n"   \
  47         "  <property name=\"TTY\" type=\"s\" access=\"read\"/>\n"       \
  48         "  <property name=\"Display\" type=\"s\" access=\"read\"/>\n"   \
  49         "  <property name=\"Remote\" type=\"b\" access=\"read\"/>\n"    \
  50         "  <property name=\"RemoteHost\" type=\"s\" access=\"read\"/>\n" \
  51         "  <property name=\"RemoteUser\" type=\"s\" access=\"read\"/>\n" \
  52         "  <property name=\"Leader\" type=\"u\" access=\"read\"/>\n"    \
  53         "  <property name=\"Audit\" type=\"u\" access=\"read\"/>\n"     \
  54         "  <property name=\"Type\" type=\"s\" access=\"read\"/>\n"      \
  55         "  <property name=\"Active\" type=\"b\" access=\"read\"/>\n"    \
  56         "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
  57         "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
  58         "  <property name=\"KillProcesses\" type=\"b\" access=\"read\"/>\n" \
  59         "  <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n"  \
  60         "  <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \
  61         "  <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \
  62         " </interface>\n"
  63
  64 #define INTROSPECTION                                                   \
  65         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
  66         "<node>\n"                                                      \
  67         BUS_SESSION_INTERFACE                                           \
  68         BUS_PROPERTIES_INTERFACE                                        \
  69         BUS_PEER_INTERFACE                                              \
  70         BUS_INTROSPECTABLE_INTERFACE                                    \
  71         "</node>\n"
  72
  73 #define INTERFACES_LIST                              \
  74         BUS_GENERIC_INTERFACES_LIST                  \
  75         "org.freedesktop.login1.Session\0"
  76
  77 static int bus_session_append_seat(DBusMessageIter *i, const char *property, void *data) {
  78         DBusMessageIter sub;
  79         Session *s = data;
  80         const char *id, *path;
  81         char *p = NULL;
  82
  83         assert(i);
  84         assert(property);
  85         assert(s);
  86
  87         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
  88                 return -ENOMEM;
  89
  90         if (s->seat) {
  91                 id = s->seat->id;
  92                 path = p = seat_bus_path(s->seat);
  93
  94                 if (!p)
  95                         return -ENOMEM;
  96         } else {
  97                 id = "";
  98                 path = "/";
  99         }
 100
 101         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &id) ||
 102             !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &path)) {
 103                 free(p);
 104                 return -ENOMEM;
 105         }
 106
 107         free(p);
 108
 109         if (!dbus_message_iter_close_container(i, &sub))
 110                 return -ENOMEM;
 111
 112         return 0;
 113 }
 114
 115 static int bus_session_append_user(DBusMessageIter *i, const char *property, void *data) {
 116         DBusMessageIter sub;
 117         Session *s = data;
 118         char *p = NULL;
 119
 120         assert(i);
 121         assert(property);
 122         assert(s);
 123
 124         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
 125                 return -ENOMEM;
 126
 127         p = user_bus_path(s->user);
 128         if (!p)
 129                 return -ENOMEM;
 130
 131         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_UINT32, &s->user->uid) ||
 132             !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &p)) {
 133                 free(p);
 134                 return -ENOMEM;
 135         }
 136
 137         free(p);
 138
 139         if (!dbus_message_iter_close_container(i, &sub))
 140                 return -ENOMEM;
 141
 142         return 0;
 143 }
 144
 145 static int bus_session_append_active(DBusMessageIter *i, const char *property, void *data) {
 146         Session *s = data;
 147         dbus_bool_t b;
 148
 149         assert(i);
 150         assert(property);
 151         assert(s);
 152
 153         b = session_is_active(s);
 154         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 155                 return -ENOMEM;
 156
 157         return 0;
 158 }
 159
 160 static int bus_session_append_idle_hint(DBusMessageIter *i, const char *property, void *data) {
 161         Session *s = data;
 162         int b;
 163
 164         assert(i);
 165         assert(property);
 166         assert(s);
 167
 168         b = session_get_idle_hint(s, NULL) > 0;
 169         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 170                 return -ENOMEM;
 171
 172         return 0;
 173 }
 174
 175 static int bus_session_append_idle_hint_since(DBusMessageIter *i, const char *property, void *data) {
 176         Session *s = data;
 177         dual_timestamp t;
 178         uint64_t u;
 179
 180         assert(i);
 181         assert(property);
 182         assert(s);
 183
 184         session_get_idle_hint(s, &t);
 185         u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 186
 187         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
 188                 return -ENOMEM;
 189
 190         return 0;
 191 }
 192
 193 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_session_append_type, session_type, SessionType);
 194
 195 static int get_session_for_path(Manager *m, const char *path, Session **_s) {
 196         Session *s;
 197         char *id;
 198
 199         assert(m);
 200         assert(path);
 201         assert(_s);
 202
 203         if (!startswith(path, "/org/freedesktop/login1/session/"))
 204                 return -EINVAL;
 205
 206         id = bus_path_unescape(path + 32);
 207         if (!id)
 208                 return -ENOMEM;
 209
 210         s = hashmap_get(m->sessions, id);
 211         free(id);
 212
 213         if (!s)
 214                 return -ENOENT;
 215
 216         *_s = s;
 217         return 0;
 218 }
 219
 220 static DBusHandlerResult session_message_dispatch(
 221                 Session *s,
 222                 DBusConnection *connection,
 223                 DBusMessage *message) {
 224
 225         const BusProperty properties[] = {
 226                 { "org.freedesktop.login1.Session", "Id",                 bus_property_append_string,   "s",    s->id                   },
 227                 { "org.freedesktop.login1.Session", "User",               bus_session_append_user,      "(uo)", s                       },
 228                 { "org.freedesktop.login1.Session", "Name",               bus_property_append_string,   "s",    s->user->name           },
 229                 { "org.freedesktop.login1.Session", "Timestamp",          bus_property_append_usec,     "t",    &s->timestamp.realtime  },
 230                 { "org.freedesktop.login1.Session", "TimestampMonotonic", bus_property_append_usec,     "t",    &s->timestamp.monotonic },
 231                 { "org.freedesktop.login1.Session", "ControlGroupPath",   bus_property_append_string,   "s",    s->cgroup_path          },
 232                 { "org.freedesktop.login1.Session", "VTNr",               bus_property_append_uint32,   "u",    &s->vtnr                },
 233                 { "org.freedesktop.login1.Session", "Seat",               bus_session_append_seat,      "(so)", s                       },
 234                 { "org.freedesktop.login1.Session", "TTY",                bus_property_append_string,   "s",    s->tty                  },
 235                 { "org.freedesktop.login1.Session", "Display",            bus_property_append_string,   "s",    s->display              },
 236                 { "org.freedesktop.login1.Session", "Remote",             bus_property_append_bool,     "b",    &s->remote              },
 237                 { "org.freedesktop.login1.Session", "RemoteUser",         bus_property_append_string,   "s",    s->remote_user          },
 238                 { "org.freedesktop.login1.Session", "RemoteHost",         bus_property_append_string,   "s",    s->remote_host          },
 239                 { "org.freedesktop.login1.Session", "Leader",             bus_property_append_pid,      "u",    &s->leader              },
 240                 { "org.freedesktop.login1.Session", "Audit",              bus_property_append_uint32,   "u",    &s->audit_id            },
 241                 { "org.freedesktop.login1.Session", "Type",               bus_session_append_type,      "s",    &s->type                },
 242                 { "org.freedesktop.login1.Session", "Active",             bus_session_append_active,    "b",    s                       },
 243                 { "org.freedesktop.login1.Session", "Controllers",        bus_property_append_strv,     "as",   s->controllers          },
 244                 { "org.freedesktop.login1.Session", "ResetControllers",   bus_property_append_strv,     "as",   s->reset_controllers    },
 245                 { "org.freedesktop.login1.Session", "KillProcesses",      bus_property_append_bool,     "b",    &s->kill_processes      },
 246                 { "org.freedesktop.login1.Session", "IdleHint",           bus_session_append_idle_hint, "b",    s                       },
 247                 { "org.freedesktop.login1.Session", "IdleSinceHint",          bus_session_append_idle_hint_since, "t", s                },
 248                 { "org.freedesktop.login1.Session", "IdleSinceHintMonotonic", bus_session_append_idle_hint_since, "t", s                },
 249                 { NULL, NULL, NULL, NULL, NULL }
 250         };
 251
 252         DBusError error;
 253         DBusMessage *reply = NULL;
 254         int r;
 255
 256         assert(s);
 257         assert(connection);
 258         assert(message);
 259
 260         dbus_error_init(&error);
 261
 262         if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Terminate")) {
 263
 264                 r = session_stop(s);
 265                 if (r < 0)
 266                         return bus_send_error_reply(connection, message, NULL, r);
 267
 268                 reply = dbus_message_new_method_return(message);
 269                 if (!reply)
 270                         goto oom;
 271
 272         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Activate")) {
 273
 274                 r = session_activate(s);
 275                 if (r < 0)
 276                         return bus_send_error_reply(connection, message, NULL, r);
 277
 278                 reply = dbus_message_new_method_return(message);
 279                 if (!reply)
 280                         goto oom;
 281
 282         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Lock") ||
 283                    dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "Unlock")) {
 284                 bool b;
 285                 DBusMessage *sig;
 286
 287                 sig = dbus_message_new_signal(dbus_message_get_path(message), "org.freedesktop.login1.Session", dbus_message_get_member(message));
 288                 if (!sig)
 289                         goto oom;
 290
 291                 b = dbus_connection_send(connection, sig, NULL);
 292                 dbus_message_unref(sig);
 293
 294                 if (!b)
 295                         goto oom;
 296
 297                 reply = dbus_message_new_method_return(message);
 298                 if (!reply)
 299                         goto oom;
 300
 301         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Session", "SetIdleHint")) {
 302                 dbus_bool_t b;
 303
 304                 if (!dbus_message_get_args(
 305                                     message,
 306                                     &error,
 307                                     DBUS_TYPE_BOOLEAN, &b,
 308                                     DBUS_TYPE_INVALID))
 309                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 310
 311                 session_set_idle_hint(s, b);
 312
 313                 reply = dbus_message_new_method_return(message);
 314                 if (!reply)
 315                         goto oom;
 316
 317         } else
 318                 return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties);
 319
 320         if (reply) {
 321                 if (!dbus_connection_send(connection, reply, NULL))
 322                         goto oom;
 323
 324                 dbus_message_unref(reply);
 325         }
 326
 327         return DBUS_HANDLER_RESULT_HANDLED;
 328
 329 oom:
 330         if (reply)
 331                 dbus_message_unref(reply);
 332
 333         dbus_error_free(&error);
 334
 335         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 336 }
 337
 338 static DBusHandlerResult session_message_handler(
 339                 DBusConnection *connection,
 340                 DBusMessage *message,
 341                 void *userdata) {
 342
 343         Manager *m = userdata;
 344         Session *s;
 345         int r;
 346
 347         r = get_session_for_path(m, dbus_message_get_path(message), &s);
 348         if (r < 0) {
 349
 350                 if (r == -ENOMEM)
 351                         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 352
 353                 if (r == -ENOENT) {
 354                         DBusError e;
 355
 356                         dbus_error_init(&e);
 357                         dbus_set_error_const(&e, DBUS_ERROR_UNKNOWN_OBJECT, "Unknown session");
 358                         return bus_send_error_reply(connection, message, &e, r);
 359                 }
 360
 361                 return bus_send_error_reply(connection, message, NULL, r);
 362         }
 363
 364         return session_message_dispatch(s, connection, message);
 365 }
 366
 367 const DBusObjectPathVTable bus_session_vtable = {
 368         .message_function = session_message_handler
 369 };
 370
 371 char *session_bus_path(Session *s) {
 372         char *t, *r;
 373
 374         assert(s);
 375
 376         t = bus_path_escape(s->id);
 377         if (!t)
 378                 return NULL;
 379
 380         r = strappend("/org/freedesktop/login1/session/", t);
 381         free(t);
 382
 383         return r;
 384 }
 385
 386 int session_send_signal(Session *s, bool new_session) {
 387         DBusMessage *m;
 388         int r = -ENOMEM;
 389         char *p = NULL;
 390
 391         assert(s);
 392
 393         m = dbus_message_new_signal("/org/freedesktop/login1",
 394                                     "org.freedesktop.login1.Manager",
 395                                     new_session ? "SessionNew" : "SessionRemoved");
 396
 397         if (!m)
 398                 return -ENOMEM;
 399
 400         p = session_bus_path(s);
 401         if (!p)
 402                 goto finish;
 403
 404         if (!dbus_message_append_args(
 405                             m,
 406                             DBUS_TYPE_STRING, &s->id,
 407                             DBUS_TYPE_OBJECT_PATH, &p,
 408                             DBUS_TYPE_INVALID))
 409                 goto finish;
 410
 411         if (!dbus_connection_send(s->manager->bus, m, NULL))
 412                 goto finish;
 413
 414         r = 0;
 415
 416 finish:
 417         dbus_message_unref(m);
 418         free(p);
 419
 420         return r;
 421 }
 422
 423 int session_send_changed(Session *s, const char *properties) {
 424         DBusMessage *m;
 425         int r = -ENOMEM;
 426         char *p = NULL;
 427
 428         assert(s);
 429
 430         p = session_bus_path(s);
 431         if (!p)
 432                 return -ENOMEM;
 433
 434         m = bus_properties_changed_new(p, "org.freedesktop.login1.Session", properties);
 435         if (!m)
 436                 goto finish;
 437
 438         if (!dbus_connection_send(s->manager->bus, m, NULL))
 439                 goto finish;
 440
 441         r = 0;
 442
 443 finish:
 444         if (m)
 445                 dbus_message_unref(m);
 446         free(p);
 447
 448         return r;
 449 }