src/seat.c

   1 /*
   2  * Copyright (C) 2010-2011 Robert Ancell.
   3  * Author: Robert Ancell <robert.ancell@canonical.com>
   4  *
   5  * This program is free software: you can redistribute it and/or modify it under
   6  * the terms of the GNU General Public License as published by the Free Software
   7  * Foundation, either version 3 of the License, or (at your option) any later
   8  * version. See http://www.gnu.org/copyleft/gpl.html the full text of the
   9  * license.
  10  */
  11
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/wait.h>
  15
  16 #include "seat.h"
  17 #include "configuration.h"
  18 #include "guest-account.h"
  19 #include "greeter.h"
  20 #include "session-config.h"
  21
  22 enum {
  23     SESSION_ADDED,
  24     RUNNING_USER_SESSION,
  25     SESSION_REMOVED,
  26     STOPPED,
  27     LAST_SIGNAL
  28 };
  29 static guint signals[LAST_SIGNAL] = { 0 };
  30
  31 struct SeatPrivate
  32 {
  33     /* Configuration for this seat */
  34     GHashTable *properties;
  35
  36     /* TRUE if able to switch users */
  37     gboolean can_switch;
  38
  39     /* TRUE if display server can be shared for sessions */
  40     gboolean share_display_server;
  41
  42     /* The display servers on this seat */
  43     GList *display_servers;
  44
  45     /* The sessions on this seat */
  46     GList *sessions;
  47
  48     /* The last session set to active */
  49     Session *active_session;
  50
  51     /* The session belonging to the active greeter user */
  52     Session *next_session;
  53
  54     /* The session to set active when it starts */
  55     Session *session_to_activate;
  56
  57     /* TRUE once we have started */
  58     gboolean started;
  59
  60     /* TRUE if stopping this seat (waiting for displays to stop) */
  61     gboolean stopping;
  62
  63     /* TRUE if stopped */
  64     gboolean stopped;
  65 };
  66
  67 /* PAM services to use */
  68 #define GREETER_SERVICE   "lightdm-greeter"
  69 #define USER_SERVICE      "lightdm"
  70 #define AUTOLOGIN_SERVICE "lightdm-autologin"
  71
  72 static void seat_logger_iface_init (LoggerInterface *iface);
  73
  74 G_DEFINE_TYPE_WITH_CODE (Seat, seat, G_TYPE_OBJECT,
  75                          G_IMPLEMENT_INTERFACE (
  76                              LOGGER_TYPE, seat_logger_iface_init));
  77
  78 typedef struct
  79 {
  80     const gchar *name;
  81     GType type;
  82 } SeatModule;
  83 static GHashTable *seat_modules = NULL;
  84
  85 // FIXME: Make a get_display_server() that re-uses display servers if supported
  86 static DisplayServer *create_display_server (Seat *seat, const gchar *session_type);
  87 static Greeter *create_greeter_session (Seat *seat);
  88 static void start_session (Seat *seat, Session *session);
  89
  90 void
  91 seat_register_module (const gchar *name, GType type)
  92 {
  93     SeatModule *module;
  94
  95     if (!seat_modules)
  96         seat_modules = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
  97
  98     g_debug ("Registered seat module %s", name);
  99
 100     module = g_malloc0 (sizeof (SeatModule));
 101     module->name = g_strdup (name);
 102     module->type = type;
 103     g_hash_table_insert (seat_modules, g_strdup (name), module);
 104 }
 105
 106 Seat *
 107 seat_new (const gchar *module_name)
 108 {
 109     Seat *seat;
 110     SeatModule *m = NULL;
 111
 112     g_return_val_if_fail (module_name != NULL, NULL);
 113
 114     if (seat_modules)
 115         m = g_hash_table_lookup (seat_modules, module_name);
 116     if (!m)
 117         return NULL;
 118
 119     seat = g_object_new (m->type, NULL);
 120
 121     return seat;
 122 }
 123
 124 void
 125 seat_set_property (Seat *seat, const gchar *name, const gchar *value)
 126 {
 127     g_return_if_fail (seat != NULL);
 128     g_hash_table_insert (seat->priv->properties, g_strdup (name), g_strdup (value));
 129 }
 130
 131 const gchar *
 132 seat_get_string_property (Seat *seat, const gchar *name)
 133 {
 134     g_return_val_if_fail (seat != NULL, NULL);
 135     return g_hash_table_lookup (seat->priv->properties, name);
 136 }
 137
 138 gboolean
 139 seat_get_boolean_property (Seat *seat, const gchar *name)
 140 {
 141     return g_strcmp0 (seat_get_string_property (seat, name), "true") == 0;
 142 }
 143
 144 gint
 145 seat_get_integer_property (Seat *seat, const gchar *name)
 146 {
 147     const gchar *value;
 148
 149     value = seat_get_string_property (seat, name);
 150     return value ? atoi (value) : 0;
 151 }
 152
 153 void
 154 seat_set_can_switch (Seat *seat, gboolean can_switch)
 155 {
 156     g_return_if_fail (seat != NULL);
 157
 158     seat->priv->can_switch = can_switch;
 159 }
 160
 161 void
 162 seat_set_share_display_server (Seat *seat, gboolean share_display_server)
 163 {
 164     g_return_if_fail (seat != NULL);
 165
 166     seat->priv->share_display_server = share_display_server;
 167 }
 168
 169 gboolean
 170 seat_start (Seat *seat)
 171 {
 172     g_return_val_if_fail (seat != NULL, FALSE);
 173
 174     SEAT_GET_CLASS (seat)->setup (seat);
 175     return SEAT_GET_CLASS (seat)->start (seat);
 176 }
 177
 178 GList *
 179 seat_get_sessions (Seat *seat)
 180 {
 181     g_return_val_if_fail (seat != NULL, NULL);
 182     return seat->priv->sessions;
 183 }
 184
 185 void
 186 seat_set_active_session (Seat *seat, Session *session)
 187 {
 188     GList *link;
 189
 190     g_return_if_fail (seat != NULL);
 191
 192     SEAT_GET_CLASS (seat)->set_active_session (seat, session);
 193
 194     /* Stop any greeters */
 195     for (link = seat->priv->sessions; link; link = link->next)
 196     {
 197         Session *s = link->data;
 198
 199         if (s == session || session_get_is_stopping (s))
 200             continue;
 201
 202         if (IS_GREETER (s))
 203         {
 204             l_debug (seat, "Stopping greeter");
 205             session_stop (s);
 206         }
 207     }
 208
 209     /* Lock previous sessions */
 210     if (seat->priv->active_session)
 211     {
 212         if (session != seat->priv->active_session && !IS_GREETER (seat->priv->active_session))
 213             session_lock (seat->priv->active_session);
 214         g_object_unref (seat->priv->active_session);
 215     }
 216     seat->priv->active_session = g_object_ref (session);
 217 }
 218
 219 Session *
 220 seat_get_active_session (Seat *seat)
 221 {
 222     g_return_val_if_fail (seat != NULL, NULL);
 223     return SEAT_GET_CLASS (seat)->get_active_session (seat);
 224 }
 225
 226 Session *
 227 seat_get_next_session (Seat *seat)
 228 {
 229     g_return_val_if_fail (seat != NULL, NULL);
 230     return seat->priv->next_session;
 231 }
 232
 233 gboolean
 234 seat_get_can_switch (Seat *seat)
 235 {
 236     g_return_val_if_fail (seat != NULL, FALSE);
 237     return seat->priv->can_switch;
 238 }
 239
 240 gboolean
 241 seat_get_allow_guest (Seat *seat)
 242 {
 243     g_return_val_if_fail (seat != NULL, FALSE);
 244     return seat_get_boolean_property (seat, "allow-guest") && guest_account_is_installed ();
 245 }
 246
 247 static gboolean
 248 run_script (Seat *seat, DisplayServer *display_server, const gchar *script_name, User *user)
 249 {
 250     Process *script;
 251     gboolean result = FALSE;
 252
 253     script = process_new ();
 254
 255     process_set_command (script, script_name);
 256
 257     /* Set POSIX variables */
 258     process_set_clear_environment (script, TRUE);
 259     process_set_env (script, "SHELL", "/bin/sh");
 260
 261     /* Variables required for regression tests */
 262     if (g_getenv ("LIGHTDM_TEST_ROOT"))
 263     {
 264         process_set_env (script, "LIGHTDM_TEST_ROOT", g_getenv ("LIGHTDM_TEST_ROOT"));
 265         process_set_env (script, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
 266         process_set_env (script, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
 267         process_set_env (script, "PATH", g_getenv ("PATH"));
 268     }
 269     else
 270         process_set_env (script, "PATH", "/usr/local/bin:/usr/bin:/bin");
 271
 272     if (user)
 273     {
 274         process_set_env (script, "USER", user_get_name (user));
 275         process_set_env (script, "LOGNAME", user_get_name (user));
 276         process_set_env (script, "HOME", user_get_home_directory (user));
 277     }
 278     else
 279         process_set_env (script, "HOME", "/");
 280
 281     SEAT_GET_CLASS (seat)->run_script (seat, display_server, script);
 282
 283     if (process_start (script, TRUE))
 284     {
 285         int exit_status;
 286
 287         exit_status = process_get_exit_status (script);
 288         if (WIFEXITED (exit_status))
 289         {
 290             l_debug (seat, "Exit status of %s: %d", script_name, WEXITSTATUS (exit_status));
 291             result = WEXITSTATUS (exit_status) == EXIT_SUCCESS;
 292         }
 293     }
 294
 295     g_object_unref (script);
 296
 297     return result;
 298 }
 299
 300 static void
 301 seat_real_run_script (Seat *seat, DisplayServer *display_server, Process *process)
 302 {
 303 }
 304
 305 static void
 306 emit_upstart_signal (const gchar *signal)
 307 {
 308     g_return_if_fail (signal != NULL);
 309     g_return_if_fail (signal[0] != 0);
 310
 311     if (getuid () != 0)
 312         return;
 313
 314     gchar *cmd = g_strdup_printf ("initctl -q emit %s DISPLAY_MANAGER=lightdm", signal);
 315     g_spawn_command_line_async (cmd, NULL); /* OK if it fails, probably not installed */
 316     g_free (cmd);
 317 }
 318
 319 static void
 320 check_stopped (Seat *seat)
 321 {
 322     if (seat->priv->stopping &&
 323         !seat->priv->stopped &&
 324         g_list_length (seat->priv->display_servers) == 0 &&
 325         g_list_length (seat->priv->sessions) == 0)
 326     {
 327         seat->priv->stopped = TRUE;
 328         l_debug (seat, "Stopped");
 329         g_signal_emit (seat, signals[STOPPED], 0);
 330     }
 331 }
 332
 333 static gboolean
 334 get_start_local_sessions (Seat *seat)
 335 {
 336     return SEAT_GET_CLASS (seat)->get_start_local_sessions (seat);
 337 }
 338
 339 static void
 340 display_server_stopped_cb (DisplayServer *display_server, Seat *seat)
 341 {
 342     const gchar *script;
 343     GList *list, *link;
 344     Session *active_session;
 345
 346     l_debug (seat, "Display server stopped");
 347
 348     /* Run a script right after stopping the display server */
 349     script = seat_get_string_property (seat, "display-stopped-script");
 350     if (script)
 351         run_script (seat, NULL, script, NULL);
 352
 353     g_signal_handlers_disconnect_matched (display_server, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, seat);
 354     seat->priv->display_servers = g_list_remove (seat->priv->display_servers, display_server);
 355
 356     if (seat->priv->stopping || !seat->priv->started)
 357     {
 358         check_stopped (seat);
 359         g_object_unref (display_server);
 360         return;
 361     }
 362
 363     /* Stop all sessions on this display server */
 364     list = g_list_copy (seat->priv->sessions);
 365     for (link = list; link; link = link->next)
 366         g_object_ref (link->data);
 367     for (link = list; link; link = link->next)
 368     {
 369         Session *session = link->data;
 370
 371         if (session_get_display_server (session) != display_server || session_get_is_stopping (session))
 372             continue;
 373
 374         /* Stop seat if this is the only display server and it failed to start a greeter */
 375         if (IS_GREETER (session) &&
 376             !session_get_is_started (session) &&
 377             g_list_length (seat->priv->display_servers) == 0)
 378         {
 379             l_debug (seat, "Stopping; greeter display server failed to start");
 380             seat_stop (seat);
 381         }
 382
 383         l_debug (seat, "Stopping session");
 384         session_stop (session);
 385     }
 386     g_list_free_full (list, g_object_unref);
 387
 388     if (!seat->priv->stopping && get_start_local_sessions (seat))
 389     {
 390         /* If we were the active session, switch to a greeter */
 391         active_session = seat_get_active_session (seat);
 392         if (!active_session || session_get_display_server (active_session) == display_server)
 393         {
 394             l_debug (seat, "Active display server stopped, starting greeter");
 395             seat_switch_to_greeter (seat);
 396         }
 397     }
 398
 399     g_object_unref (display_server);
 400 }
 401
 402 static gboolean
 403 can_share_display_server (Seat *seat, DisplayServer *display_server)
 404 {
 405     return seat->priv->share_display_server && display_server_get_can_share (display_server);
 406 }
 407
 408 static void
 409 switch_to_greeter_from_failed_session (Seat *seat, Session *session)
 410 {
 411     Greeter *greeter_session;
 412
 413     greeter_session = create_greeter_session (seat);
 414     if (session_get_is_guest (session))
 415         greeter_set_hint (greeter_session, "select-guest", "true");
 416     else
 417         greeter_set_hint (greeter_session, "select-user", session_get_username (session));
 418     if (seat->priv->session_to_activate)
 419         g_object_unref (seat->priv->session_to_activate);
 420     seat->priv->session_to_activate = g_object_ref (greeter_session);
 421
 422     if (can_share_display_server (seat, session_get_display_server (session)))
 423         session_set_display_server (SESSION (greeter_session), session_get_display_server (session));
 424     else
 425     {
 426         DisplayServer *display_server;
 427
 428         display_server = create_display_server (seat, session_get_session_type (session));
 429         if (!display_server_start (display_server))
 430         {
 431             l_debug (seat, "Failed to start display server for greeter");
 432             seat_stop (seat);
 433         }
 434
 435         session_set_display_server (session, display_server);
 436     }
 437
 438     start_session (seat, SESSION (greeter_session));
 439
 440     /* Stop failed session */
 441     session_stop (session);
 442 }
 443
 444 static void
 445 start_session (Seat *seat, Session *session)
 446 {
 447     /* Use system location for greeter log file */
 448     if (IS_GREETER (session))
 449     {
 450         gchar *log_dir, *filename, *log_filename;
 451
 452         log_dir = config_get_string (config_get_instance (), "LightDM", "log-directory");
 453         filename = g_strdup_printf ("%s-greeter.log", display_server_get_name (session_get_display_server (session)));
 454         log_filename = g_build_filename (log_dir, filename, NULL);
 455         g_free (log_dir);
 456         g_free (filename);
 457         session_set_log_file (session, log_filename);
 458         g_free (log_filename);
 459     }
 460
 461     if (session_start (session))
 462         return;
 463
 464     if (IS_GREETER (session))
 465     {
 466         l_debug (seat, "Failed to start greeter");
 467         display_server_stop (session_get_display_server (session));
 468         return;
 469     }
 470
 471     l_debug (seat, "Failed to start session, starting greeter");
 472     switch_to_greeter_from_failed_session (seat, session);
 473 }
 474
 475 static void
 476 run_session (Seat *seat, Session *session)
 477 {
 478     const gchar *script;
 479
 480     if (IS_GREETER (session))
 481         script = seat_get_string_property (seat, "greeter-setup-script");
 482     else
 483         script = seat_get_string_property (seat, "session-setup-script");
 484     if (script && !run_script (seat, session_get_display_server (session), script, NULL))
 485     {
 486         l_debug (seat, "Switching to greeter due to failed setup script");
 487         switch_to_greeter_from_failed_session (seat, session);
 488         return;
 489     }
 490
 491     if (!IS_GREETER (session))
 492     {
 493         g_signal_emit (seat, signals[RUNNING_USER_SESSION], 0, session);
 494         emit_upstart_signal ("desktop-session-start");
 495     }
 496
 497     session_run (session);
 498
 499     // FIXME: Wait until the session is ready
 500
 501     if (session == seat->priv->session_to_activate)
 502     {
 503         seat_set_active_session (seat, session);
 504         g_object_unref (seat->priv->session_to_activate);
 505         seat->priv->session_to_activate = NULL;
 506     }
 507 }
 508
 509 static Session *
 510 find_user_session (Seat *seat, const gchar *username, Session *ignore_session)
 511 {
 512     GList *link;
 513
 514     if (!username)
 515         return NULL;
 516
 517     for (link = seat->priv->sessions; link; link = link->next)
 518     {
 519         Session *session = link->data;
 520
 521         if (session == ignore_session)
 522             continue;
 523
 524         if (!session_get_is_stopping (session) && g_strcmp0 (session_get_username (session), username) == 0)
 525             return session;
 526     }
 527
 528     return NULL;
 529 }
 530
 531 static void
 532 greeter_active_username_changed_cb (Greeter *greeter, GParamSpec *pspec, Seat *seat)
 533 {
 534     Session *session;
 535
 536     session = find_user_session (seat, greeter_get_active_username (greeter), seat->priv->active_session);
 537
 538     if (seat->priv->next_session)
 539         g_object_unref (seat->priv->next_session);
 540     seat->priv->next_session = session ? g_object_ref (session) : NULL;
 541
 542     SEAT_GET_CLASS (seat)->set_next_session (seat, session);
 543 }
 544
 545 static void
 546 session_authentication_complete_cb (Session *session, Seat *seat)
 547 {
 548     if (session_get_is_authenticated (session))
 549     {
 550         Session *s;
 551
 552         s = find_user_session (seat, session_get_username (session), session);
 553         if (s)
 554         {
 555             l_debug (seat, "Session authenticated, switching to existing user session");
 556             seat_set_active_session (seat, s);
 557             session_stop (session);
 558         }
 559         else
 560         {
 561             l_debug (seat, "Session authenticated, running command");
 562             run_session (seat, session);
 563         }
 564     }
 565     else if (!IS_GREETER (session))
 566     {
 567         l_debug (seat, "Switching to greeter due to failed authentication");
 568         switch_to_greeter_from_failed_session (seat, session);
 569     }
 570     else
 571     {
 572         l_debug (seat, "Stopping session that failed authentication");
 573         session_stop (session);
 574     }
 575 }
 576
 577 static void
 578 session_stopped_cb (Session *session, Seat *seat)
 579 {
 580     DisplayServer *display_server;
 581
 582     l_debug (seat, "Session stopped");
 583
 584     g_signal_handlers_disconnect_matched (session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, seat);
 585     seat->priv->sessions = g_list_remove (seat->priv->sessions, session);
 586     if (session == seat->priv->active_session)
 587     {
 588         g_object_unref (seat->priv->active_session);
 589         seat->priv->active_session = NULL;
 590     }
 591     if (session == seat->priv->next_session)
 592     {
 593         g_object_unref (seat->priv->next_session);
 594         seat->priv->next_session = NULL;
 595     }
 596     if (session == seat->priv->session_to_activate)
 597     {
 598         g_object_unref (seat->priv->session_to_activate);
 599         seat->priv->session_to_activate = NULL;
 600     }
 601
 602     display_server = session_get_display_server (session);
 603     if (!display_server)
 604     {
 605         g_object_unref (session);
 606         return;
 607     }
 608
 609     /* Cleanup */
 610     if (!IS_GREETER (session))
 611     {
 612         const gchar *script;
 613         script = seat_get_string_property (seat, "session-cleanup-script");
 614         if (script)
 615             run_script (seat, display_server, script, session_get_user (session));
 616     }
 617
 618     /* We were waiting for this session, but it didn't start :( */
 619     // FIXME: Start a greeter on this?
 620     if (session == seat->priv->session_to_activate)
 621     {
 622         g_object_unref (seat->priv->session_to_activate);
 623         seat->priv->session_to_activate = NULL;
 624     }
 625
 626     if (seat->priv->stopping)
 627     {
 628         check_stopped (seat);
 629         g_object_unref (session);
 630         return;
 631     }
 632
 633     /* If this is the greeter session then re-use this display server */
 634     if (IS_GREETER (session) &&
 635         can_share_display_server (seat, display_server) &&
 636         greeter_get_start_session (GREETER (session)))
 637     {
 638         GList *link;
 639
 640         for (link = seat->priv->sessions; link; link = link->next)
 641         {
 642             Session *s = link->data;
 643
 644             /* Skip this session and sessions on other display servers */
 645             if (s == session || session_get_display_server (s) != display_server || session_get_is_stopping (s))
 646                 continue;
 647
 648             if (session_get_is_authenticated (s))
 649             {
 650                 l_debug (seat, "Greeter stopped, running session");
 651                 run_session (seat, s);
 652             }
 653             else
 654             {
 655                 l_debug (seat, "Greeter stopped, starting session authentication");
 656                 start_session (seat, s);
 657             }
 658             break;
 659         }
 660     }
 661     /* If this is the greeter and nothing else is running then stop the seat */
 662     else if (IS_GREETER (session) &&
 663         !greeter_get_start_session (GREETER (session)) &&
 664         g_list_length (seat->priv->display_servers) == 1 &&
 665         g_list_nth_data (seat->priv->display_servers, 0) == display_server)
 666     {
 667         l_debug (seat, "Stopping; failed to start a greeter");
 668         seat_stop (seat);
 669     }
 670     /* If we were the active session, switch to a greeter */
 671     else if (!IS_GREETER (session) && session == seat_get_active_session (seat))
 672     {
 673         l_debug (seat, "Active session stopped, starting greeter");
 674         seat_switch_to_greeter (seat);
 675     }
 676
 677     /* Stop the display server if no-longer required */
 678     if (display_server && !display_server_get_is_stopping (display_server))
 679     {
 680         GList *link;
 681         int n_sessions = 0;
 682
 683         for (link = seat->priv->sessions; link; link = link->next)
 684         {
 685             Session *s = link->data;
 686             if (s == session)
 687                 continue;
 688             if (session_get_display_server (s) == display_server)
 689                 n_sessions++;
 690         }
 691         if (n_sessions == 0)
 692         {
 693             l_debug (seat, "Stopping display server, no sessions require it");
 694             display_server_stop (display_server);
 695         }
 696     }
 697
 698     g_signal_emit (seat, signals[SESSION_REMOVED], 0, session);
 699     g_object_unref (session);
 700 }
 701
 702 static void
 703 set_session_env (Session *session)
 704 {
 705     /* Connect using the session bus */
 706     if (getuid () != 0)
 707     {
 708         if (g_getenv ("DBUS_SESSION_BUS_ADDRESS"))
 709             session_set_env (session, "DBUS_SESSION_BUS_ADDRESS", g_getenv ("DBUS_SESSION_BUS_ADDRESS"));
 710         session_set_env (session, "LDM_BUS", "SESSION");
 711         if (g_getenv ("LD_PRELOAD"))
 712             session_set_env (session, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
 713         if (g_getenv ("LD_LIBRARY_PATH"))
 714             session_set_env (session, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
 715         if (g_getenv ("PATH"))
 716             session_set_env (session, "PATH", g_getenv ("PATH"));
 717     }
 718
 719     /* Variables required for regression tests */
 720     if (g_getenv ("LIGHTDM_TEST_ROOT"))
 721     {
 722         session_set_env (session, "LIGHTDM_TEST_ROOT", g_getenv ("LIGHTDM_TEST_ROOT"));
 723         session_set_env (session, "DBUS_SYSTEM_BUS_ADDRESS", g_getenv ("DBUS_SYSTEM_BUS_ADDRESS"));
 724         session_set_env (session, "DBUS_SESSION_BUS_ADDRESS", g_getenv ("DBUS_SESSION_BUS_ADDRESS"));
 725         session_set_env (session, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
 726         session_set_env (session, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
 727         session_set_env (session, "GI_TYPELIB_PATH", g_getenv ("GI_TYPELIB_PATH"));
 728     }
 729 }
 730
 731 static Session *
 732 create_session (Seat *seat, gboolean autostart)
 733 {
 734     Session *session;
 735
 736     session = SEAT_GET_CLASS (seat)->create_session (seat);
 737     seat->priv->sessions = g_list_append (seat->priv->sessions, session);
 738     if (autostart)
 739         g_signal_connect (session, "authentication-complete", G_CALLBACK (session_authentication_complete_cb), seat);
 740     g_signal_connect (session, "stopped", G_CALLBACK (session_stopped_cb), seat);
 741
 742     set_session_env (session);
 743
 744     g_signal_emit (seat, signals[SESSION_ADDED], 0, session);
 745
 746     return session;
 747 }
 748
 749 static gchar **
 750 get_session_argv (Seat *seat, SessionConfig *session_config, const gchar *session_wrapper)
 751 {
 752     gboolean result;
 753     int argc;
 754     gchar **argv, *path;
 755     GError *error = NULL;
 756
 757     /* If configured, run sessions through a wrapper */
 758     if (session_wrapper)
 759     {
 760         argv = g_malloc (sizeof (gchar *) * 3);
 761         path = g_find_program_in_path (session_wrapper);
 762         argv[0] = path ? path : g_strdup (session_wrapper);
 763         argv[1] = g_strdup (session_config_get_command (session_config));
 764         argv[2] = NULL;
 765         return argv;
 766     }
 767
 768     /* Split command into an array listing and make command absolute */
 769     result = g_shell_parse_argv (session_config_get_command (session_config), &argc, &argv, &error);
 770     if (error)
 771         l_debug (seat, "Invalid session command '%s': %s", session_config_get_command (session_config), error->message);
 772     g_clear_error (&error);
 773     if (!result)
 774         return NULL;
 775     path = g_find_program_in_path (argv[0]);
 776     if (path)
 777     {
 778         g_free (argv[0]);
 779         argv[0] = path;
 780     }
 781
 782     return argv;
 783 }
 784
 785 static SessionConfig *
 786 find_session_config (Seat *seat, const gchar *sessions_dir, const gchar *session_name)
 787 {
 788     gchar **dirs;
 789     SessionConfig *session_config = NULL;
 790     int i;
 791     GError *error = NULL;
 792
 793     g_return_val_if_fail (sessions_dir != NULL, NULL);
 794     g_return_val_if_fail (session_name != NULL, NULL);
 795
 796     dirs = g_strsplit (sessions_dir, ":", -1);
 797     for (i = 0; dirs[i]; i++)
 798     {
 799         gchar *filename, *path;
 800
 801         filename = g_strdup_printf ("%s.desktop", session_name);
 802         path = g_build_filename (dirs[i], filename, NULL);
 803         g_free (filename);
 804         session_config = session_config_new_from_file (path, &error);
 805         g_free (path);
 806         if (session_config)
 807             break;
 808
 809         if (dirs[i+1] == NULL)
 810             l_debug (seat, "Failed to find session configuration %s", session_name);
 811         g_clear_error (&error);
 812     }
 813     g_strfreev (dirs);
 814
 815     return session_config;
 816 }
 817
 818 static void
 819 configure_session (Session *session, SessionConfig *config, const gchar *session_name, const gchar *language)
 820 {
 821     const gchar *desktop_name;
 822
 823     session_set_session_type (session, session_config_get_session_type (config));
 824     session_set_env (session, "DESKTOP_SESSION", session_name);
 825     session_set_env (session, "GDMSESSION", session_name);
 826     desktop_name = session_config_get_desktop_name (config);
 827     if (desktop_name)
 828         session_set_env (session, "XDG_CURRENT_DESKTOP", desktop_name);
 829     if (language && language[0] != '\0')
 830     {
 831         session_set_env (session, "LANG", language);
 832         session_set_env (session, "GDM_LANG", language);
 833     }
 834 }
 835
 836 static Session *
 837 create_user_session (Seat *seat, const gchar *username, gboolean autostart)
 838 {
 839     User *user;
 840     gchar *sessions_dir;
 841     const gchar *session_name, *language;
 842     SessionConfig *session_config;
 843     Session *session = NULL;
 844
 845     l_debug (seat, "Creating user session");
 846
 847     /* Load user preferences */
 848     user = accounts_get_user_by_name (username);
 849     if (!user)
 850     {
 851         l_debug (seat, "Can't login unknown user '%s'", username);
 852         return NULL;
 853     }
 854     session_name = user_get_xsession (user);
 855     language = user_get_language (user);
 856
 857     if (!session_name)
 858         session_name = seat_get_string_property (seat, "user-session");
 859     sessions_dir = config_get_string (config_get_instance (), "LightDM", "sessions-directory");
 860     session_config = find_session_config (seat, sessions_dir, session_name);
 861     g_free (sessions_dir);
 862     if (session_config)
 863     {
 864         gchar **argv;
 865
 866         session = create_session (seat, autostart);
 867         configure_session (session, session_config, session_name, language);
 868         session_set_username (session, username);
 869         session_set_do_authenticate (session, TRUE);
 870         argv = get_session_argv (seat, session_config, seat_get_string_property (seat, "session-wrapper"));
 871         session_set_argv (session, argv);
 872         g_strfreev (argv);
 873         g_object_unref (session_config);
 874     }
 875     else
 876         l_debug (seat, "Can't find session '%s'", seat_get_string_property (seat, "user-session"));
 877
 878     g_object_unref (user);
 879
 880     return session;
 881 }
 882
 883 static Session *
 884 create_guest_session (Seat *seat)
 885 {
 886     const gchar *session_name;
 887     gchar *sessions_dir, **argv;
 888     SessionConfig *session_config;
 889     Session *session;
 890
 891     session_name = seat_get_string_property (seat, "user-session");
 892     sessions_dir = config_get_string (config_get_instance (), "LightDM", "sessions-directory");
 893     session_config = find_session_config (seat, sessions_dir, session_name);
 894     g_free (sessions_dir);
 895     if (!session_config)
 896     {
 897         l_debug (seat, "Can't find session '%s'", seat_get_string_property (seat, "user-session"));
 898         return NULL;
 899     }
 900
 901     session = create_session (seat, TRUE);
 902     configure_session (session, session_config, session_name, NULL);
 903     session_set_do_authenticate (session, TRUE);
 904     session_set_is_guest (session, TRUE);
 905     argv = get_session_argv (seat, session_config, seat_get_string_property (seat, "session-wrapper"));
 906     session_set_argv (session, argv);
 907     g_strfreev (argv);
 908     g_object_unref (session_config);
 909
 910     return session;
 911 }
 912
 913 static Session *
 914 greeter_create_session_cb (Greeter *greeter, Seat *seat)
 915 {
 916     Session *session;
 917
 918     session = create_session (seat, FALSE);
 919     session_set_session_type (session, session_get_session_type (SESSION (greeter)));
 920     session_set_display_server (session, session_get_display_server (SESSION (greeter)));
 921
 922     return g_object_ref (session);
 923 }
 924
 925 static void
 926 prepend_argv (gchar ***argv, const gchar *value)
 927 {
 928     gchar **old_argv, **new_argv;
 929     gint i;
 930
 931     old_argv = *argv;
 932     new_argv = g_malloc (sizeof (gchar *) * (g_strv_length (*argv) + 2));
 933     new_argv[0] = g_strdup (value);
 934     for (i = 0; old_argv[i]; i++)
 935         new_argv[i + 1] = old_argv[i];
 936     new_argv[i + 1] = NULL;
 937
 938     g_free (*argv);
 939     *argv = new_argv;
 940 }
 941
 942 static gboolean
 943 greeter_start_session_cb (Greeter *greeter, SessionType type, const gchar *session_name, Seat *seat)
 944 {
 945     Session *session, *existing_session;
 946     const gchar *username, *language = NULL;
 947     SessionConfig *session_config;
 948     User *user;
 949     gchar *sessions_dir = NULL;
 950     gchar **argv;
 951     DisplayServer *display_server;
 952
 953     /* Get the session to use */
 954     if (greeter_get_guest_authenticated (greeter))
 955     {
 956         session = create_guest_session (seat);
 957         if (!session)
 958             return FALSE;
 959         session_set_pam_service (session, AUTOLOGIN_SERVICE);
 960     }
 961     else
 962         session = greeter_get_authentication_session (greeter);
 963
 964     /* Switch to this session when it is ready */
 965     if (seat->priv->session_to_activate)
 966         g_object_unref (seat->priv->session_to_activate);
 967     seat->priv->session_to_activate = g_object_ref (session);
 968
 969     /* Return to existing session if it is open */
 970     username = session_get_username (session);
 971     existing_session = find_user_session (seat, username, NULL);
 972     if (existing_session && session != existing_session)
 973     {
 974         l_debug (seat, "Returning to existing user session %s", username);
 975         session_stop (session);
 976         session_unlock (existing_session);
 977         seat_set_active_session (seat, existing_session);
 978         return TRUE;
 979     }
 980
 981     /* Get session command to run */
 982     switch (type)
 983     {
 984     case SESSION_TYPE_LOCAL:
 985         sessions_dir = config_get_string (config_get_instance (), "LightDM", "sessions-directory");
 986         break;
 987     case SESSION_TYPE_REMOTE:
 988         sessions_dir = config_get_string (config_get_instance (), "LightDM", "remote-sessions-directory");
 989         break;
 990     }
 991
 992     /* Load user preferences */
 993     user = session_get_user (session);
 994     if (user)
 995     {
 996         if (!session_name)
 997             session_name = user_get_xsession (user);
 998         language = user_get_language (user);
 999     }
1000
1001     if (!session_name)
1002         session_name = seat_get_string_property (seat, "user-session");
1003     if (user)
1004         user_set_xsession (session_get_user (session), session_name);
1005
1006     session_config = find_session_config (seat, sessions_dir, session_name);
1007     g_free (sessions_dir);
1008     if (!session_config)
1009     {
1010         l_debug (seat, "Can't find session '%s'", seat_get_string_property (seat, "user-session"));
1011         return FALSE;
1012     }
1013
1014     configure_session (session, session_config, session_name, language);
1015     argv = get_session_argv (seat, session_config, seat_get_string_property (seat, "session-wrapper"));
1016     session_set_argv (session, argv);
1017     g_strfreev (argv);
1018     g_object_unref (session_config);
1019
1020     /* If can re-use the display server, stop the greeter first */
1021     display_server = session_get_display_server (SESSION (greeter));
1022     if (can_share_display_server (seat, display_server) &&
1023         strcmp (display_server_get_session_type (display_server), session_get_session_type (session)) == 0)
1024     {
1025         l_debug (seat, "Stopping greeter; display server will be re-used for user session");
1026
1027         /* Run on the same display server after the greeter has stopped */
1028         session_set_display_server (session, display_server);
1029
1030         /* Stop the greeter */
1031         session_stop (SESSION (greeter));
1032
1033         return TRUE;
1034     }
1035     /* Otherwise start a new display server for this session */
1036     else
1037     {
1038         display_server = create_display_server (seat, session_get_session_type (session));
1039         session_set_display_server (session, display_server);
1040         if (!display_server_start (display_server))
1041         {
1042             l_debug (seat, "Failed to start display server for new session");
1043             return FALSE;
1044         }
1045
1046         return TRUE;
1047     }
1048 }
1049
1050 static Greeter *
1051 create_greeter_session (Seat *seat)
1052 {
1053     gchar *sessions_dir, **argv;
1054     SessionConfig *session_config;
1055     Greeter *greeter_session;
1056     const gchar *greeter_wrapper;
1057
1058     l_debug (seat, "Creating greeter session");
1059
1060     sessions_dir = config_get_string (config_get_instance (), "LightDM", "greeters-directory");
1061     session_config = find_session_config (seat, sessions_dir, seat_get_string_property (seat, "greeter-session"));
1062     g_free (sessions_dir);
1063     if (!session_config)
1064         return NULL;
1065
1066     argv = get_session_argv (seat, session_config, NULL);
1067     greeter_wrapper = seat_get_string_property (seat, "greeter-wrapper");
1068     if (greeter_wrapper)
1069     {
1070         gchar *path;
1071         path = g_find_program_in_path (greeter_wrapper);
1072         prepend_argv (&argv, path ? path : greeter_wrapper);
1073         g_free (path);
1074     }
1075
1076     greeter_session = SEAT_GET_CLASS (seat)->create_greeter_session (seat);
1077     session_set_session_type (SESSION (greeter_session), session_config_get_session_type (session_config));
1078     seat->priv->sessions = g_list_append (seat->priv->sessions, SESSION (greeter_session));
1079     g_signal_connect (greeter_session, "notify::active-username", G_CALLBACK (greeter_active_username_changed_cb), seat);
1080     g_signal_connect (greeter_session, "authentication-complete", G_CALLBACK (session_authentication_complete_cb), seat);
1081     g_signal_connect (greeter_session, "stopped", G_CALLBACK (session_stopped_cb), seat);
1082
1083     set_session_env (SESSION (greeter_session));
1084     session_set_env (SESSION (greeter_session), "XDG_SESSION_CLASS", "greeter");
1085
1086     session_set_pam_service (SESSION (greeter_session), GREETER_SERVICE);
1087     if (getuid () == 0)
1088     {
1089         gchar *greeter_user;
1090         greeter_user = config_get_string (config_get_instance (), "LightDM", "greeter-user");
1091         session_set_username (SESSION (greeter_session), greeter_user);
1092         g_free (greeter_user);
1093     }
1094     else
1095     {
1096         /* In test mode run the greeter as ourself */
1097         session_set_username (SESSION (greeter_session), user_get_name (accounts_get_current_user ()));
1098     }
1099     session_set_argv (SESSION (greeter_session), argv);
1100     g_strfreev (argv);
1101
1102     greeter_set_pam_services (greeter_session, USER_SERVICE, AUTOLOGIN_SERVICE);
1103     g_signal_connect (greeter_session, "create-session", G_CALLBACK (greeter_create_session_cb), seat);
1104     g_signal_connect (greeter_session, "start-session", G_CALLBACK (greeter_start_session_cb), seat);
1105
1106     /* Set hints to greeter */
1107     greeter_set_hint (greeter_session, "default-session", seat_get_string_property (seat, "user-session"));
1108     greeter_set_allow_guest (greeter_session, seat_get_allow_guest (seat));
1109     greeter_set_hint (greeter_session, "hide-users", seat_get_boolean_property (seat, "greeter-hide-users") ? "true" : "false");
1110     greeter_set_hint (greeter_session, "show-manual-login", seat_get_boolean_property (seat, "greeter-show-manual-login") ? "true" : "false");
1111     greeter_set_hint (greeter_session, "show-remote-login", seat_get_boolean_property (seat, "greeter-show-remote-login") ? "true" : "false");
1112     greeter_set_hint (greeter_session, "has-guest-account", seat_get_allow_guest (seat) && seat_get_boolean_property (seat, "greeter-allow-guest") ? "true" : "false");
1113
1114     g_object_unref (session_config);
1115
1116     return greeter_session;
1117 }
1118
1119 static Session *
1120 find_session_for_display_server (Seat *seat, DisplayServer *display_server)
1121 {
1122     GList *link;
1123
1124     for (link = seat->priv->sessions; link; link = link->next)
1125     {
1126         Session *session = link->data;
1127         if (session_get_display_server (session) == display_server && !session_get_is_stopping (session))
1128             return session;
1129     }
1130
1131     return NULL;
1132 }
1133
1134 static void
1135 display_server_ready_cb (DisplayServer *display_server, Seat *seat)
1136 {
1137     const gchar *script;
1138     Session *session;
1139
1140     /* Run setup script */
1141     script = seat_get_string_property (seat, "display-setup-script");
1142     if (script && !run_script (seat, display_server, script, NULL))
1143     {
1144         l_debug (seat, "Stopping display server due to failed setup script");
1145         display_server_stop (display_server);
1146         return;
1147     }
1148
1149     /* Stop if don't need to run a session */
1150     if (!get_start_local_sessions (seat))
1151         return;
1152
1153     emit_upstart_signal ("login-session-start");
1154
1155     /* Start the session waiting for this display server */
1156     session = find_session_for_display_server (seat, display_server);
1157     if (session)
1158     {
1159         if (session_get_is_authenticated (session))
1160         {
1161             l_debug (seat, "Display server ready, running session");
1162             run_session (seat, session);
1163         }
1164         else
1165         {
1166             l_debug (seat, "Display server ready, starting session authentication");
1167             start_session (seat, session);
1168         }
1169     }
1170     else
1171     {
1172         l_debug (seat, "Stopping not required display server");
1173         display_server_stop (display_server);
1174     }
1175 }
1176
1177 static DisplayServer *
1178 create_display_server (Seat *seat, const gchar *session_type)
1179 {
1180     DisplayServer *display_server;
1181
1182     l_debug (seat, "Creating display server of type %s", session_type);
1183
1184     display_server = SEAT_GET_CLASS (seat)->create_display_server (seat, session_type);
1185     if (!display_server)
1186         return NULL;
1187
1188     seat->priv->display_servers = g_list_append (seat->priv->display_servers, display_server);
1189     g_signal_connect (display_server, "ready", G_CALLBACK (display_server_ready_cb), seat);
1190     g_signal_connect (display_server, "stopped", G_CALLBACK (display_server_stopped_cb), seat);
1191
1192     return display_server;
1193 }
1194
1195 static Greeter *
1196 find_greeter_session (Seat *seat)
1197 {
1198     GList *link;
1199
1200     for (link = seat->priv->sessions; link; link = link->next)
1201     {
1202         Session *session = link->data;
1203         if (!session_get_is_stopping (session) && IS_GREETER (session))
1204             return GREETER (session);
1205     }
1206
1207     return NULL;
1208 }
1209
1210 gboolean
1211 seat_switch_to_greeter (Seat *seat)
1212 {
1213     Greeter *greeter_session;
1214     DisplayServer *display_server;
1215
1216     g_return_val_if_fail (seat != NULL, FALSE);
1217
1218     if (!seat->priv->can_switch)
1219         return FALSE;
1220
1221     /* Switch to greeter if one open (shouldn't be though) */
1222     greeter_session = find_greeter_session (seat);
1223     if (greeter_session)
1224     {
1225         l_debug (seat, "Switching to existing greeter");
1226         seat_set_active_session (seat, SESSION (greeter_session));
1227         return TRUE;
1228     }
1229
1230     greeter_session = create_greeter_session (seat);
1231     if (seat->priv->session_to_activate)
1232         g_object_unref (seat->priv->session_to_activate);
1233     seat->priv->session_to_activate = g_object_ref (greeter_session);
1234
1235     display_server = create_display_server (seat, session_get_session_type (SESSION (greeter_session)));
1236     session_set_display_server (SESSION (greeter_session), display_server);
1237     if (!display_server_start (display_server))
1238         return FALSE;
1239
1240     return TRUE;
1241 }
1242
1243 static void
1244 switch_authentication_complete_cb (Session *session, Seat *seat)
1245 {
1246     Greeter *greeter_session;
1247     DisplayServer *display_server;
1248
1249     /* If authenticated, then unlock existing session or start new one */
1250     if (session_get_is_authenticated (session))
1251     {
1252         Session *s;
1253
1254         s = find_user_session (seat, session_get_username (session), session);
1255         if (s)
1256         {
1257             l_debug (seat, "Session authenticated, switching to existing user session");
1258             session_unlock (s);
1259             seat_set_active_session (seat, s);
1260             session_stop (session);
1261         }
1262         else
1263         {
1264             l_debug (seat, "Session authenticated, starting display server");
1265             if (seat->priv->session_to_activate)
1266                 g_object_unref (seat->priv->session_to_activate);
1267             seat->priv->session_to_activate = g_object_ref (session);
1268             display_server = create_display_server (seat, session_get_session_type (session));
1269             session_set_display_server (session, display_server);
1270             display_server_start (display_server);
1271         }
1272
1273         return;
1274     }
1275
1276     l_debug (seat, "Switching to greeter to authenticate session");
1277
1278     session_stop (session);
1279
1280     greeter_session = create_greeter_session (seat);
1281     if (session_get_is_guest (session))
1282         greeter_set_hint (greeter_session, "select-guest", "true");
1283     else
1284         greeter_set_hint (greeter_session, "select-user", session_get_username (session));
1285     if (seat->priv->session_to_activate)
1286         g_object_unref (seat->priv->session_to_activate);
1287     seat->priv->session_to_activate = g_object_ref (greeter_session);
1288
1289     display_server = create_display_server (seat, session_get_session_type (SESSION (greeter_session)));
1290     session_set_display_server (SESSION (greeter_session), display_server);
1291     display_server_start (display_server);
1292 }
1293
1294 gboolean
1295 seat_switch_to_user (Seat *seat, const gchar *username, const gchar *session_name)
1296 {
1297     Session *session;
1298
1299     g_return_val_if_fail (seat != NULL, FALSE);
1300     g_return_val_if_fail (username != NULL, FALSE);
1301
1302     if (!seat->priv->can_switch)
1303         return FALSE;
1304
1305     /* If we're already on this session, then ignore */
1306     session = find_user_session (seat, username, NULL);
1307     if (session && session == seat->priv->active_session)
1308         return TRUE;
1309
1310     l_debug (seat, "Switching to user %s", username);
1311
1312     /* Attempt to authenticate them */
1313     session = create_user_session (seat, username, FALSE);
1314     g_signal_connect (session, "authentication-complete", G_CALLBACK (switch_authentication_complete_cb), seat);
1315     session_set_pam_service (session, USER_SERVICE);
1316     session_start (session);
1317
1318     return FALSE;
1319 }
1320
1321 static Session *
1322 find_guest_session (Seat *seat)
1323 {
1324     GList *link;
1325
1326     for (link = seat->priv->sessions; link; link = link->next)
1327     {
1328         Session *session = link->data;
1329         if (!session_get_is_stopping (session) && session_get_is_guest (session))
1330             return session;
1331     }
1332
1333     return NULL;
1334 }
1335
1336 gboolean
1337 seat_switch_to_guest (Seat *seat, const gchar *session_name)
1338 {
1339     Session *session;
1340     DisplayServer *display_server;
1341
1342     g_return_val_if_fail (seat != NULL, FALSE);
1343
1344     if (!seat->priv->can_switch || !seat_get_allow_guest (seat))
1345         return FALSE;
1346
1347     /* Switch to session if one open */
1348     session = find_guest_session (seat);
1349     if (session)
1350     {
1351         l_debug (seat, "Switching to existing guest account %s", session_get_username (session));
1352         seat_set_active_session (seat, session);
1353         return TRUE;
1354     }
1355
1356     session = create_guest_session (seat);
1357     if (!session)
1358         return FALSE;
1359
1360     display_server = create_display_server (seat, session_get_session_type (session));
1361     if (!display_server_start (display_server))
1362         return FALSE;
1363
1364     if (seat->priv->session_to_activate)
1365         g_object_unref (seat->priv->session_to_activate);
1366     seat->priv->session_to_activate = g_object_ref (session);
1367     session_set_pam_service (session, AUTOLOGIN_SERVICE);
1368     session_set_display_server (session, display_server);
1369
1370     return TRUE;
1371 }
1372
1373 gboolean
1374 seat_lock (Seat *seat, const gchar *username)
1375 {
1376     Greeter *greeter_session;
1377     DisplayServer *display_server;
1378
1379     g_return_val_if_fail (seat != NULL, FALSE);
1380
1381     if (!seat->priv->can_switch)
1382         return FALSE;
1383
1384     l_debug (seat, "Locking");
1385
1386     /* Switch to greeter if one open (shouldn't be though) */
1387     greeter_session = find_greeter_session (seat);
1388     if (greeter_session)
1389     {
1390         l_debug (seat, "Switching to existing greeter");
1391         seat_set_active_session (seat, SESSION (greeter_session));
1392         return TRUE;
1393     }
1394
1395     greeter_session = create_greeter_session (seat);
1396     if (!greeter_session)
1397         return FALSE;
1398
1399     display_server = create_display_server (seat, session_get_session_type (SESSION (greeter_session)));
1400     if (!display_server_start (display_server))
1401         return FALSE;
1402
1403     if (seat->priv->session_to_activate)
1404         g_object_unref (seat->priv->session_to_activate);
1405     seat->priv->session_to_activate = g_object_ref (greeter_session);
1406     greeter_set_hint (greeter_session, "lock-screen", "true");
1407     if (username)
1408         greeter_set_hint (greeter_session, "select-user", username);
1409     session_set_display_server (SESSION (greeter_session), display_server);
1410
1411     return TRUE;
1412 }
1413
1414 void
1415 seat_stop (Seat *seat)
1416 {
1417     g_return_if_fail (seat != NULL);
1418
1419     if (seat->priv->stopping)
1420         return;
1421
1422     l_debug (seat, "Stopping");
1423     seat->priv->stopping = TRUE;
1424     SEAT_GET_CLASS (seat)->stop (seat);
1425 }
1426
1427 gboolean
1428 seat_get_is_stopping (Seat *seat)
1429 {
1430     g_return_val_if_fail (seat != NULL, FALSE);
1431     return seat->priv->stopping;
1432 }
1433
1434 static gboolean
1435 seat_real_get_start_local_sessions (Seat *seat)
1436 {
1437     return TRUE;
1438 }
1439
1440 static void
1441 seat_real_setup (Seat *seat)
1442 {
1443 }
1444
1445 static gboolean
1446 seat_real_start (Seat *seat)
1447 {
1448     const gchar *autologin_username;
1449     int autologin_timeout;
1450     gboolean autologin_guest;
1451     gboolean autologin_in_background;
1452     Session *session = NULL, *background_session = NULL;
1453
1454     l_debug (seat, "Starting");
1455
1456     /* If this display server doesn't have a session running on it, just start it */
1457     if (!get_start_local_sessions (seat))
1458     {
1459         DisplayServer *display_server;
1460         display_server = create_display_server (seat, "x"); // FIXME: Not necessarily an X seat, but not sure what to put here
1461         return display_server_start (display_server);
1462     }
1463
1464     /* Get autologin settings */
1465     autologin_username = seat_get_string_property (seat, "autologin-user");
1466     if (g_strcmp0 (autologin_username, "") == 0)
1467         autologin_username = NULL;
1468     autologin_timeout = seat_get_integer_property (seat, "autologin-user-timeout");
1469     autologin_guest = seat_get_boolean_property (seat, "autologin-guest");
1470     autologin_in_background = seat_get_boolean_property (seat, "autologin-in-background");
1471
1472     /* Autologin if configured */
1473     if (autologin_timeout == 0 || autologin_in_background)
1474     {
1475         if (autologin_guest)
1476             session = create_guest_session (seat);
1477         else if (autologin_username != NULL)
1478             session = create_user_session (seat, autologin_username, TRUE);
1479
1480         if (session)
1481             session_set_pam_service (session, AUTOLOGIN_SERVICE);
1482
1483         /* Load in background if required */
1484         if (autologin_in_background && session)
1485         {
1486             background_session = session;
1487             session = NULL;
1488         }
1489
1490         if (session)
1491         {
1492             DisplayServer *display_server;
1493
1494             if (seat->priv->session_to_activate)
1495                 g_object_unref (seat->priv->session_to_activate);
1496             seat->priv->session_to_activate = g_object_ref (session);
1497
1498             display_server = create_display_server (seat, session_get_session_type (session));
1499             session_set_display_server (session, display_server);
1500             if (!display_server || !display_server_start (display_server))
1501             {
1502                 l_debug (seat, "Can't create display server for automatic login");
1503                 session_stop (session);
1504                 if (display_server)
1505                     display_server_stop (display_server);
1506                 session = NULL;
1507             }
1508         }
1509     }
1510
1511     /* Fallback to a greeter */
1512     if (!session)
1513     {
1514         Greeter *greeter_session;
1515         DisplayServer *display_server;
1516
1517         greeter_session = create_greeter_session (seat);
1518         if (!greeter_session)
1519         {
1520             l_debug (seat, "Failed to create greeter session");
1521             return FALSE;
1522         }
1523
1524         if (seat->priv->session_to_activate)
1525             g_object_unref (seat->priv->session_to_activate);
1526         seat->priv->session_to_activate = g_object_ref (greeter_session);
1527         session = SESSION (greeter_session);
1528
1529         if (autologin_timeout)
1530         {
1531             gchar *value;
1532
1533             value = g_strdup_printf ("%d", autologin_timeout);
1534             greeter_set_hint (greeter_session, "autologin-timeout", value);
1535             g_free (value);
1536             if (autologin_username)
1537                 greeter_set_hint (greeter_session, "autologin-user", autologin_username);
1538             if (autologin_guest)
1539                 greeter_set_hint (greeter_session, "autologin-guest", "true");
1540         }
1541
1542         display_server = create_display_server (seat, session_get_session_type (session));
1543         session_set_display_server (session, display_server);
1544         if (!display_server || !display_server_start (display_server))
1545         {
1546             l_debug (seat, "Can't create display server for greeter");
1547             session_stop (session);
1548             if (display_server)
1549                 display_server_stop (display_server);
1550             session = NULL;
1551         }
1552     }
1553
1554     /* Fail if can't start a session */
1555     if (!session)
1556     {
1557         seat_stop (seat);
1558         return FALSE;
1559     }
1560
1561     /* Start background session */
1562     if (background_session)
1563     {
1564         DisplayServer *background_display_server;
1565
1566         background_display_server = create_display_server (seat, session_get_session_type (background_session));
1567         session_set_display_server (background_session, background_display_server);
1568         if (!display_server_start (background_display_server))
1569             l_warning (seat, "Failed to start display server for background session");
1570     }
1571
1572     seat->priv->started = TRUE;
1573     return TRUE;
1574 }
1575
1576 static Greeter *
1577 seat_real_create_greeter_session (Seat *seat)
1578 {
1579     return greeter_new ();
1580 }
1581
1582 static Session *
1583 seat_real_create_session (Seat *seat)
1584 {
1585     return session_new ();
1586 }
1587
1588 static void
1589 seat_real_set_active_session (Seat *seat, Session *session)
1590 {
1591 }
1592
1593 static void
1594 seat_real_set_next_session (Seat *seat, Session *session)
1595 {
1596 }
1597
1598 static Session *
1599 seat_real_get_active_session (Seat *seat)
1600 {
1601     return NULL;
1602 }
1603
1604 static void
1605 seat_real_stop (Seat *seat)
1606 {
1607     GList *list, *link;
1608
1609     check_stopped (seat);
1610     if (seat->priv->stopped)
1611         return;
1612
1613     /* Stop all the display servers and sessions on the seat. Copy the list as
1614      * it might be modified if a display server / session stops during this loop */
1615     list = g_list_copy (seat->priv->display_servers);
1616     for (link = list; link; link = link->next)
1617         g_object_ref (link->data);
1618     for (link = list; link; link = link->next)
1619     {
1620         DisplayServer *display_server = link->data;
1621         if (!display_server_get_is_stopping (display_server))
1622         {
1623             l_debug (seat, "Stopping display server");
1624             display_server_stop (display_server);
1625         }
1626     }
1627     g_list_free_full (list, g_object_unref);
1628     list = g_list_copy (seat->priv->sessions);
1629     for (link = list; link; link = link->next)
1630         g_object_ref (link->data);
1631     for (link = list; link; link = link->next)
1632     {
1633         Session *session = link->data;
1634         if (!session_get_is_stopping (session))
1635         {
1636             l_debug (seat, "Stopping session");
1637             session_stop (session);
1638         }
1639     }
1640     g_list_free_full (list, g_object_unref);
1641 }
1642
1643 static void
1644 seat_init (Seat *seat)
1645 {
1646     seat->priv = G_TYPE_INSTANCE_GET_PRIVATE (seat, SEAT_TYPE, SeatPrivate);
1647     seat->priv->properties = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
1648     seat->priv->share_display_server = TRUE;
1649 }
1650
1651 static void
1652 seat_finalize (GObject *object)
1653 {
1654     Seat *self;
1655     GList *link;
1656
1657     self = SEAT (object);
1658
1659     g_hash_table_unref (self->priv->properties);
1660     for (link = self->priv->display_servers; link; link = link->next)
1661     {
1662         DisplayServer *display_server = link->data;
1663         g_signal_handlers_disconnect_matched (display_server, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
1664     }
1665     g_list_free_full (self->priv->display_servers, g_object_unref);
1666     for (link = self->priv->sessions; link; link = link->next)
1667     {
1668         Session *session = link->data;
1669         g_signal_handlers_disconnect_matched (session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
1670     }
1671     g_list_free_full (self->priv->sessions, g_object_unref);
1672     if (self->priv->active_session)
1673         g_object_unref (self->priv->active_session);
1674     if (self->priv->next_session)
1675         g_object_unref (self->priv->next_session);
1676     if (self->priv->session_to_activate)
1677         g_object_unref (self->priv->session_to_activate);
1678
1679     G_OBJECT_CLASS (seat_parent_class)->finalize (object);
1680 }
1681
1682 static void
1683 seat_class_init (SeatClass *klass)
1684 {
1685     GObjectClass *object_class = G_OBJECT_CLASS (klass);
1686
1687     klass->get_start_local_sessions = seat_real_get_start_local_sessions;
1688     klass->setup = seat_real_setup;
1689     klass->start = seat_real_start;
1690     klass->create_greeter_session = seat_real_create_greeter_session;
1691     klass->create_session = seat_real_create_session;
1692     klass->set_active_session = seat_real_set_active_session;
1693     klass->get_active_session = seat_real_get_active_session;
1694     klass->set_next_session = seat_real_set_next_session;
1695     klass->run_script = seat_real_run_script;
1696     klass->stop = seat_real_stop;
1697
1698     object_class->finalize = seat_finalize;
1699
1700     g_type_class_add_private (klass, sizeof (SeatPrivate));
1701
1702     signals[SESSION_ADDED] =
1703         g_signal_new ("session-added",
1704                       G_TYPE_FROM_CLASS (klass),
1705                       G_SIGNAL_RUN_LAST,
1706                       G_STRUCT_OFFSET (SeatClass, session_added),
1707                       NULL, NULL,
1708                       NULL,
1709                       G_TYPE_NONE, 1, SESSION_TYPE);
1710     signals[RUNNING_USER_SESSION] =
1711         g_signal_new ("running-user-session",
1712                       G_TYPE_FROM_CLASS (klass),
1713                       G_SIGNAL_RUN_LAST,
1714                       G_STRUCT_OFFSET (SeatClass, running_user_session),
1715                       NULL, NULL,
1716                       NULL,
1717                       G_TYPE_NONE, 1, SESSION_TYPE);
1718     signals[SESSION_REMOVED] =
1719         g_signal_new ("session-removed",
1720                       G_TYPE_FROM_CLASS (klass),
1721                       G_SIGNAL_RUN_LAST,
1722                       G_STRUCT_OFFSET (SeatClass, session_removed),
1723                       NULL, NULL,
1724                       NULL,
1725                       G_TYPE_NONE, 1, SESSION_TYPE);
1726     signals[STOPPED] =
1727         g_signal_new ("stopped",
1728                       G_TYPE_FROM_CLASS (klass),
1729                       G_SIGNAL_RUN_LAST,
1730                       G_STRUCT_OFFSET (SeatClass, stopped),
1731                       NULL, NULL,
1732                       NULL,
1733                       G_TYPE_NONE, 0);
1734 }
1735
1736 static gint
1737 seat_real_logprefix (Logger *self, gchar *buf, gulong buflen)
1738 {
1739     Seat *seat = SEAT (self);
1740     const gchar *name = seat_get_string_property (seat, "seat-name");
1741     if (name)
1742         return g_snprintf (buf, buflen, "Seat %s: ", name);
1743     else
1744         return g_snprintf (buf, buflen, "Seat: ");
1745 }
1746
1747 static void
1748 seat_logger_iface_init (LoggerInterface *iface)
1749 {
1750     iface->logprefix = &seat_real_logprefix;
1751 }