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 gchar **
 139 seat_get_string_list_property (Seat *seat, const gchar *name)
 140 {
 141     g_return_val_if_fail (seat != NULL, NULL);
 142     return g_strsplit (g_hash_table_lookup (seat->priv->properties, name), ";", 0);
 143 }
 144
 145 gboolean
 146 seat_get_boolean_property (Seat *seat, const gchar *name)
 147 {
 148     return g_strcmp0 (seat_get_string_property (seat, name), "true") == 0;
 149 }
 150
 151 gint
 152 seat_get_integer_property (Seat *seat, const gchar *name)
 153 {
 154     const gchar *value;
 155
 156     value = seat_get_string_property (seat, name);
 157     return value ? atoi (value) : 0;
 158 }
 159
 160 void
 161 seat_set_can_switch (Seat *seat, gboolean can_switch)
 162 {
 163     g_return_if_fail (seat != NULL);
 164
 165     seat->priv->can_switch = can_switch;
 166 }
 167
 168 void
 169 seat_set_share_display_server (Seat *seat, gboolean share_display_server)
 170 {
 171     g_return_if_fail (seat != NULL);
 172
 173     seat->priv->share_display_server = share_display_server;
 174 }
 175
 176 gboolean
 177 seat_start (Seat *seat)
 178 {
 179     g_return_val_if_fail (seat != NULL, FALSE);
 180
 181     SEAT_GET_CLASS (seat)->setup (seat);
 182     return SEAT_GET_CLASS (seat)->start (seat);
 183 }
 184
 185 GList *
 186 seat_get_sessions (Seat *seat)
 187 {
 188     g_return_val_if_fail (seat != NULL, NULL);
 189     return seat->priv->sessions;
 190 }
 191
 192 void
 193 seat_set_active_session (Seat *seat, Session *session)
 194 {
 195     GList *link;
 196
 197     g_return_if_fail (seat != NULL);
 198
 199     SEAT_GET_CLASS (seat)->set_active_session (seat, session);
 200
 201     /* Stop any greeters */
 202     for (link = seat->priv->sessions; link; link = link->next)
 203     {
 204         Session *s = link->data;
 205
 206         if (s == session || session_get_is_stopping (s))
 207             continue;
 208
 209         if (IS_GREETER (s))
 210         {
 211             l_debug (seat, "Stopping greeter");
 212             session_stop (s);
 213         }
 214     }
 215
 216     /* Lock previous sessions */
 217     if (seat->priv->active_session)
 218     {
 219         if (session != seat->priv->active_session && !IS_GREETER (seat->priv->active_session))
 220             session_lock (seat->priv->active_session);
 221         g_object_unref (seat->priv->active_session);
 222     }
 223     seat->priv->active_session = g_object_ref (session);
 224 }
 225
 226 Session *
 227 seat_get_active_session (Seat *seat)
 228 {
 229     g_return_val_if_fail (seat != NULL, NULL);
 230     return SEAT_GET_CLASS (seat)->get_active_session (seat);
 231 }
 232
 233 Session *
 234 seat_get_next_session (Seat *seat)
 235 {
 236     g_return_val_if_fail (seat != NULL, NULL);
 237     return seat->priv->next_session;
 238 }
 239
 240 gboolean
 241 seat_get_can_switch (Seat *seat)
 242 {
 243     g_return_val_if_fail (seat != NULL, FALSE);
 244     return seat->priv->can_switch;
 245 }
 246
 247 gboolean
 248 seat_get_allow_guest (Seat *seat)
 249 {
 250     g_return_val_if_fail (seat != NULL, FALSE);
 251     return seat_get_boolean_property (seat, "allow-guest") && guest_account_is_installed ();
 252 }
 253
 254 static gboolean
 255 run_script (Seat *seat, DisplayServer *display_server, const gchar *script_name, User *user)
 256 {
 257     Process *script;
 258     gboolean result = FALSE;
 259
 260     script = process_new ();
 261
 262     process_set_command (script, script_name);
 263
 264     /* Set POSIX variables */
 265     process_set_clear_environment (script, TRUE);
 266     process_set_env (script, "SHELL", "/bin/sh");
 267
 268     /* Variables required for regression tests */
 269     if (g_getenv ("LIGHTDM_TEST_ROOT"))
 270     {
 271         process_set_env (script, "LIGHTDM_TEST_ROOT", g_getenv ("LIGHTDM_TEST_ROOT"));
 272         process_set_env (script, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
 273         process_set_env (script, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
 274         process_set_env (script, "PATH", g_getenv ("PATH"));
 275     }
 276     else
 277         process_set_env (script, "PATH", "/usr/local/bin:/usr/bin:/bin");
 278
 279     if (user)
 280     {
 281         process_set_env (script, "USER", user_get_name (user));
 282         process_set_env (script, "LOGNAME", user_get_name (user));
 283         process_set_env (script, "HOME", user_get_home_directory (user));
 284     }
 285     else
 286         process_set_env (script, "HOME", "/");
 287
 288     SEAT_GET_CLASS (seat)->run_script (seat, display_server, script);
 289
 290     if (process_start (script, TRUE))
 291     {
 292         int exit_status;
 293
 294         exit_status = process_get_exit_status (script);
 295         if (WIFEXITED (exit_status))
 296         {
 297             l_debug (seat, "Exit status of %s: %d", script_name, WEXITSTATUS (exit_status));
 298             result = WEXITSTATUS (exit_status) == EXIT_SUCCESS;
 299         }
 300     }
 301
 302     g_object_unref (script);
 303
 304     return result;
 305 }
 306
 307 static void
 308 seat_real_run_script (Seat *seat, DisplayServer *display_server, Process *process)
 309 {
 310 }
 311
 312 static void
 313 emit_upstart_signal (const gchar *signal)
 314 {
 315     g_return_if_fail (signal != NULL);
 316     g_return_if_fail (signal[0] != 0);
 317
 318     if (getuid () != 0)
 319         return;
 320
 321     gchar *cmd = g_strdup_printf ("initctl -q emit %s DISPLAY_MANAGER=lightdm", signal);
 322     g_spawn_command_line_async (cmd, NULL); /* OK if it fails, probably not installed */
 323     g_free (cmd);
 324 }
 325
 326 static void
 327 check_stopped (Seat *seat)
 328 {
 329     if (seat->priv->stopping &&
 330         !seat->priv->stopped &&
 331         g_list_length (seat->priv->display_servers) == 0 &&
 332         g_list_length (seat->priv->sessions) == 0)
 333     {
 334         seat->priv->stopped = TRUE;
 335         l_debug (seat, "Stopped");
 336         g_signal_emit (seat, signals[STOPPED], 0);
 337     }
 338 }
 339
 340 static gboolean
 341 get_start_local_sessions (Seat *seat)
 342 {
 343     return SEAT_GET_CLASS (seat)->get_start_local_sessions (seat);
 344 }
 345
 346 static void
 347 display_server_stopped_cb (DisplayServer *display_server, Seat *seat)
 348 {
 349     const gchar *script;
 350     GList *list, *link;
 351     Session *active_session;
 352
 353     l_debug (seat, "Display server stopped");
 354
 355     /* Run a script right after stopping the display server */
 356     script = seat_get_string_property (seat, "display-stopped-script");
 357     if (script)
 358         run_script (seat, NULL, script, NULL);
 359
 360     g_signal_handlers_disconnect_matched (display_server, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, seat);
 361     seat->priv->display_servers = g_list_remove (seat->priv->display_servers, display_server);
 362
 363     if (seat->priv->stopping || !seat->priv->started)
 364     {
 365         check_stopped (seat);
 366         g_object_unref (display_server);
 367         return;
 368     }
 369
 370     /* Stop all sessions on this display server */
 371     list = g_list_copy (seat->priv->sessions);
 372     for (link = list; link; link = link->next)
 373         g_object_ref (link->data);
 374     for (link = list; link; link = link->next)
 375     {
 376         Session *session = link->data;
 377
 378         if (session_get_display_server (session) != display_server || session_get_is_stopping (session))
 379             continue;
 380
 381         /* Stop seat if this is the only display server and it failed to start a greeter */
 382         if (IS_GREETER (session) &&
 383             !session_get_is_started (session) &&
 384             g_list_length (seat->priv->display_servers) == 0)
 385         {
 386             l_debug (seat, "Stopping; greeter display server failed to start");
 387             seat_stop (seat);
 388         }
 389
 390         l_debug (seat, "Stopping session");
 391         session_stop (session);
 392     }
 393     g_list_free_full (list, g_object_unref);
 394
 395     if (!seat->priv->stopping && get_start_local_sessions (seat))
 396     {
 397         /* If we were the active session, switch to a greeter */
 398         active_session = seat_get_active_session (seat);
 399         if (!active_session || session_get_display_server (active_session) == display_server)
 400         {
 401             l_debug (seat, "Active display server stopped, starting greeter");
 402             if (!seat_switch_to_greeter (seat))
 403             {
 404                 l_debug (seat, "Stopping; failed to start a greeter");
 405                 seat_stop (seat);
 406             }
 407         }
 408     }
 409
 410     g_object_unref (display_server);
 411 }
 412
 413 static gboolean
 414 can_share_display_server (Seat *seat, DisplayServer *display_server)
 415 {
 416     return seat->priv->share_display_server && display_server_get_can_share (display_server);
 417 }
 418
 419 static void
 420 switch_to_greeter_from_failed_session (Seat *seat, Session *session)
 421 {
 422     Greeter *greeter_session;
 423
 424     greeter_session = create_greeter_session (seat);
 425     if (session_get_is_guest (session))
 426         greeter_set_hint (greeter_session, "select-guest", "true");
 427     else
 428         greeter_set_hint (greeter_session, "select-user", session_get_username (session));
 429     if (seat->priv->session_to_activate)
 430         g_object_unref (seat->priv->session_to_activate);
 431     seat->priv->session_to_activate = g_object_ref (greeter_session);
 432
 433     if (can_share_display_server (seat, session_get_display_server (session)))
 434         session_set_display_server (SESSION (greeter_session), session_get_display_server (session));
 435     else
 436     {
 437         DisplayServer *display_server;
 438
 439         display_server = create_display_server (seat, session_get_session_type (session));
 440         session_set_display_server (session, display_server);
 441         if (!display_server_start (display_server))
 442         {
 443             l_debug (seat, "Failed to start display server for greeter");
 444             seat_stop (seat);
 445         }
 446     }
 447
 448     start_session (seat, SESSION (greeter_session));
 449
 450     /* Stop failed session */
 451     session_stop (session);
 452 }
 453
 454 static void
 455 start_session (Seat *seat, Session *session)
 456 {
 457     /* Use system location for greeter log file */
 458     if (IS_GREETER (session))
 459     {
 460         gchar *log_dir, *filename, *log_filename;
 461
 462         log_dir = config_get_string (config_get_instance (), "LightDM", "log-directory");
 463         filename = g_strdup_printf ("%s-greeter.log", display_server_get_name (session_get_display_server (session)));
 464         log_filename = g_build_filename (log_dir, filename, NULL);
 465         g_free (log_dir);
 466         g_free (filename);
 467         session_set_log_file (session, log_filename);
 468         g_free (log_filename);
 469     }
 470
 471     if (session_start (session))
 472         return;
 473
 474     if (IS_GREETER (session))
 475     {
 476         l_debug (seat, "Failed to start greeter");
 477         display_server_stop (session_get_display_server (session));
 478         return;
 479     }
 480
 481     l_debug (seat, "Failed to start session, starting greeter");
 482     switch_to_greeter_from_failed_session (seat, session);
 483 }
 484
 485 static void
 486 run_session (Seat *seat, Session *session)
 487 {
 488     const gchar *script;
 489
 490     if (IS_GREETER (session))
 491         script = seat_get_string_property (seat, "greeter-setup-script");
 492     else
 493         script = seat_get_string_property (seat, "session-setup-script");
 494     if (script && !run_script (seat, session_get_display_server (session), script, session_get_user (session)))
 495     {
 496         l_debug (seat, "Switching to greeter due to failed setup script");
 497         switch_to_greeter_from_failed_session (seat, session);
 498         return;
 499     }
 500
 501     if (!IS_GREETER (session))
 502     {
 503         g_signal_emit (seat, signals[RUNNING_USER_SESSION], 0, session);
 504         emit_upstart_signal ("desktop-session-start");
 505     }
 506
 507     session_run (session);
 508
 509     // FIXME: Wait until the session is ready
 510
 511     if (session == seat->priv->session_to_activate)
 512     {
 513         seat_set_active_session (seat, session);
 514         g_object_unref (seat->priv->session_to_activate);
 515         seat->priv->session_to_activate = NULL;
 516     }
 517 }
 518
 519 static Session *
 520 find_user_session (Seat *seat, const gchar *username, Session *ignore_session)
 521 {
 522     GList *link;
 523
 524     if (!username)
 525         return NULL;
 526
 527     for (link = seat->priv->sessions; link; link = link->next)
 528     {
 529         Session *session = link->data;
 530
 531         if (session == ignore_session)
 532             continue;
 533
 534         if (!session_get_is_stopping (session) && g_strcmp0 (session_get_username (session), username) == 0)
 535             return session;
 536     }
 537
 538     return NULL;
 539 }
 540
 541 static void
 542 greeter_active_username_changed_cb (Greeter *greeter, GParamSpec *pspec, Seat *seat)
 543 {
 544     Session *session;
 545
 546     session = find_user_session (seat, greeter_get_active_username (greeter), seat->priv->active_session);
 547
 548     if (seat->priv->next_session)
 549         g_object_unref (seat->priv->next_session);
 550     seat->priv->next_session = session ? g_object_ref (session) : NULL;
 551
 552     SEAT_GET_CLASS (seat)->set_next_session (seat, session);
 553 }
 554
 555 static void
 556 session_authentication_complete_cb (Session *session, Seat *seat)
 557 {
 558     if (session_get_is_authenticated (session))
 559     {
 560         Session *s;
 561
 562         s = find_user_session (seat, session_get_username (session), session);
 563         if (s)
 564         {
 565             l_debug (seat, "Session authenticated, switching to existing user session");
 566             seat_set_active_session (seat, s);
 567             session_stop (session);
 568         }
 569         else
 570         {
 571             l_debug (seat, "Session authenticated, running command");
 572             run_session (seat, session);
 573         }
 574     }
 575     else if (!IS_GREETER (session))
 576     {
 577         l_debug (seat, "Switching to greeter due to failed authentication");
 578         switch_to_greeter_from_failed_session (seat, session);
 579     }
 580     else
 581     {
 582         l_debug (seat, "Stopping session that failed authentication");
 583         session_stop (session);
 584     }
 585 }
 586
 587 static void
 588 session_stopped_cb (Session *session, Seat *seat)
 589 {
 590     DisplayServer *display_server;
 591
 592     l_debug (seat, "Session stopped");
 593
 594     g_signal_handlers_disconnect_matched (session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, seat);
 595     seat->priv->sessions = g_list_remove (seat->priv->sessions, session);
 596     if (session == seat->priv->active_session)
 597     {
 598         g_object_unref (seat->priv->active_session);
 599         seat->priv->active_session = NULL;
 600     }
 601     if (session == seat->priv->next_session)
 602     {
 603         g_object_unref (seat->priv->next_session);
 604         seat->priv->next_session = NULL;
 605     }
 606     if (session == seat->priv->session_to_activate)
 607     {
 608         g_object_unref (seat->priv->session_to_activate);
 609         seat->priv->session_to_activate = NULL;
 610     }
 611
 612     display_server = session_get_display_server (session);
 613     if (!display_server)
 614     {
 615         g_object_unref (session);
 616         return;
 617     }
 618
 619     /* Cleanup */
 620     if (!IS_GREETER (session))
 621     {
 622         const gchar *script;
 623         script = seat_get_string_property (seat, "session-cleanup-script");
 624         if (script)
 625             run_script (seat, display_server, script, session_get_user (session));
 626     }
 627
 628     /* We were waiting for this session, but it didn't start :( */
 629     // FIXME: Start a greeter on this?
 630     if (session == seat->priv->session_to_activate)
 631     {
 632         g_object_unref (seat->priv->session_to_activate);
 633         seat->priv->session_to_activate = NULL;
 634     }
 635
 636     if (seat->priv->stopping)
 637     {
 638         check_stopped (seat);
 639         g_object_unref (session);
 640         return;
 641     }
 642
 643     /* If this is the greeter session then re-use this display server */
 644     if (IS_GREETER (session) &&
 645         can_share_display_server (seat, display_server) &&
 646         greeter_get_start_session (GREETER (session)))
 647     {
 648         GList *link;
 649
 650         for (link = seat->priv->sessions; link; link = link->next)
 651         {
 652             Session *s = link->data;
 653
 654             /* Skip this session and sessions on other display servers */
 655             if (s == session || session_get_display_server (s) != display_server || session_get_is_stopping (s))
 656                 continue;
 657
 658             if (session_get_is_authenticated (s))
 659             {
 660                 l_debug (seat, "Greeter stopped, running session");
 661                 run_session (seat, s);
 662             }
 663             else
 664             {
 665                 l_debug (seat, "Greeter stopped, starting session authentication");
 666                 start_session (seat, s);
 667             }
 668             break;
 669         }
 670     }
 671     /* If this is the greeter and nothing else is running then stop the seat */
 672     else if (IS_GREETER (session) &&
 673         !greeter_get_start_session (GREETER (session)) &&
 674         g_list_length (seat->priv->display_servers) == 1 &&
 675         g_list_nth_data (seat->priv->display_servers, 0) == display_server)
 676     {
 677         l_debug (seat, "Stopping; failed to start a greeter");
 678         seat_stop (seat);
 679     }
 680     /* If we were the active session, switch to a greeter */
 681     else if (!IS_GREETER (session) && session == seat_get_active_session (seat))
 682     {
 683         l_debug (seat, "Active session stopped, starting greeter");
 684         if (!seat_switch_to_greeter (seat))
 685         {
 686             l_debug (seat, "Stopping; failed to start a greeter");
 687             seat_stop (seat);
 688         }
 689     }
 690
 691     /* Stop the display server if no-longer required */
 692     if (display_server && !display_server_get_is_stopping (display_server))
 693     {
 694         GList *link;
 695         int n_sessions = 0;
 696
 697         for (link = seat->priv->sessions; link; link = link->next)
 698         {
 699             Session *s = link->data;
 700             if (s == session)
 701                 continue;
 702             if (session_get_display_server (s) == display_server)
 703                 n_sessions++;
 704         }
 705         if (n_sessions == 0)
 706         {
 707             l_debug (seat, "Stopping display server, no sessions require it");
 708             display_server_stop (display_server);
 709         }
 710     }
 711
 712     g_signal_emit (seat, signals[SESSION_REMOVED], 0, session);
 713     g_object_unref (session);
 714 }
 715
 716 static void
 717 set_session_env (Session *session)
 718 {
 719     /* Connect using the session bus */
 720     if (getuid () != 0)
 721     {
 722         if (g_getenv ("DBUS_SESSION_BUS_ADDRESS"))
 723             session_set_env (session, "DBUS_SESSION_BUS_ADDRESS", g_getenv ("DBUS_SESSION_BUS_ADDRESS"));
 724         session_set_env (session, "LDM_BUS", "SESSION");
 725         if (g_getenv ("LD_PRELOAD"))
 726             session_set_env (session, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
 727         if (g_getenv ("LD_LIBRARY_PATH"))
 728             session_set_env (session, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
 729         if (g_getenv ("PATH"))
 730             session_set_env (session, "PATH", g_getenv ("PATH"));
 731     }
 732
 733     /* Variables required for regression tests */
 734     if (g_getenv ("LIGHTDM_TEST_ROOT"))
 735     {
 736         session_set_env (session, "LIGHTDM_TEST_ROOT", g_getenv ("LIGHTDM_TEST_ROOT"));
 737         session_set_env (session, "DBUS_SYSTEM_BUS_ADDRESS", g_getenv ("DBUS_SYSTEM_BUS_ADDRESS"));
 738         session_set_env (session, "DBUS_SESSION_BUS_ADDRESS", g_getenv ("DBUS_SESSION_BUS_ADDRESS"));
 739         session_set_env (session, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
 740         session_set_env (session, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
 741         session_set_env (session, "GI_TYPELIB_PATH", g_getenv ("GI_TYPELIB_PATH"));
 742     }
 743 }
 744
 745 static Session *
 746 create_session (Seat *seat, gboolean autostart)
 747 {
 748     Session *session;
 749
 750     session = SEAT_GET_CLASS (seat)->create_session (seat);
 751     seat->priv->sessions = g_list_append (seat->priv->sessions, session);
 752     if (autostart)
 753         g_signal_connect (session, "authentication-complete", G_CALLBACK (session_authentication_complete_cb), seat);
 754     g_signal_connect (session, "stopped", G_CALLBACK (session_stopped_cb), seat);
 755
 756     set_session_env (session);
 757
 758     g_signal_emit (seat, signals[SESSION_ADDED], 0, session);
 759
 760     return session;
 761 }
 762
 763 static gchar **
 764 get_session_argv (Seat *seat, SessionConfig *session_config, const gchar *session_wrapper)
 765 {
 766     gboolean result;
 767     int argc;
 768     gchar **argv, *path;
 769     GError *error = NULL;
 770
 771     /* If configured, run sessions through a wrapper */
 772     if (session_wrapper)
 773     {
 774         argv = g_malloc (sizeof (gchar *) * 3);
 775         path = g_find_program_in_path (session_wrapper);
 776         argv[0] = path ? path : g_strdup (session_wrapper);
 777         argv[1] = g_strdup (session_config_get_command (session_config));
 778         argv[2] = NULL;
 779         return argv;
 780     }
 781
 782     /* Split command into an array listing and make command absolute */
 783     result = g_shell_parse_argv (session_config_get_command (session_config), &argc, &argv, &error);
 784     if (error)
 785         l_debug (seat, "Invalid session command '%s': %s", session_config_get_command (session_config), error->message);
 786     g_clear_error (&error);
 787     if (!result)
 788         return NULL;
 789     path = g_find_program_in_path (argv[0]);
 790     if (path)
 791     {
 792         g_free (argv[0]);
 793         argv[0] = path;
 794     }
 795
 796     return argv;
 797 }
 798
 799 static SessionConfig *
 800 find_session_config (Seat *seat, const gchar *sessions_dir, const gchar *session_name)
 801 {
 802     gchar **dirs;
 803     SessionConfig *session_config = NULL;
 804     int i;
 805     GError *error = NULL;
 806
 807     g_return_val_if_fail (sessions_dir != NULL, NULL);
 808     g_return_val_if_fail (session_name != NULL, NULL);
 809
 810     dirs = g_strsplit (sessions_dir, ":", -1);
 811     for (i = 0; dirs[i]; i++)
 812     {
 813         gchar *filename, *path;
 814
 815         filename = g_strdup_printf ("%s.desktop", session_name);
 816         path = g_build_filename (dirs[i], filename, NULL);
 817         g_free (filename);
 818         session_config = session_config_new_from_file (path, &error);
 819         g_free (path);
 820         if (session_config)
 821             break;
 822
 823         if (dirs[i+1] == NULL)
 824             l_debug (seat, "Failed to find session configuration %s", session_name);
 825         g_clear_error (&error);
 826     }
 827     g_strfreev (dirs);
 828
 829     return session_config;
 830 }
 831
 832 static void
 833 configure_session (Session *session, SessionConfig *config, const gchar *session_name, const gchar *language)
 834 {
 835     const gchar *desktop_name;
 836
 837     session_set_session_type (session, session_config_get_session_type (config));
 838     session_set_env (session, "DESKTOP_SESSION", session_name);
 839     session_set_env (session, "GDMSESSION", session_name);
 840     desktop_name = session_config_get_desktop_name (config);
 841     if (desktop_name)
 842         session_set_env (session, "XDG_CURRENT_DESKTOP", desktop_name);
 843     if (language && language[0] != '\0')
 844     {
 845         session_set_env (session, "LANG", language);
 846         session_set_env (session, "GDM_LANG", language);
 847     }
 848 }
 849
 850 static Session *
 851 create_user_session (Seat *seat, const gchar *username, gboolean autostart)
 852 {
 853     User *user;
 854     gchar *sessions_dir;
 855     const gchar *session_name, *language;
 856     SessionConfig *session_config;
 857     Session *session = NULL;
 858
 859     l_debug (seat, "Creating user session");
 860
 861     /* Load user preferences */
 862     user = accounts_get_user_by_name (username);
 863     if (!user)
 864     {
 865         l_debug (seat, "Can't login unknown user '%s'", username);
 866         return NULL;
 867     }
 868     session_name = user_get_xsession (user);
 869     language = user_get_language (user);
 870
 871     if (!session_name)
 872         session_name = seat_get_string_property (seat, "user-session");
 873     sessions_dir = config_get_string (config_get_instance (), "LightDM", "sessions-directory");
 874     session_config = find_session_config (seat, sessions_dir, session_name);
 875     g_free (sessions_dir);
 876     if (session_config)
 877     {
 878         gchar **argv;
 879
 880         session = create_session (seat, autostart);
 881         configure_session (session, session_config, session_name, language);
 882         session_set_username (session, username);
 883         session_set_do_authenticate (session, TRUE);
 884         argv = get_session_argv (seat, session_config, seat_get_string_property (seat, "session-wrapper"));
 885         session_set_argv (session, argv);
 886         g_strfreev (argv);
 887         g_object_unref (session_config);
 888     }
 889     else
 890         l_debug (seat, "Can't find session '%s'", seat_get_string_property (seat, "user-session"));
 891
 892     g_object_unref (user);
 893
 894     return session;
 895 }
 896
 897 static void
 898 prepend_argv (gchar ***argv, const gchar *value)
 899 {
 900     gchar **old_argv, **new_argv;
 901     gint i;
 902
 903     old_argv = *argv;
 904     new_argv = g_malloc (sizeof (gchar *) * (g_strv_length (*argv) + 2));
 905     new_argv[0] = g_strdup (value);
 906     for (i = 0; old_argv[i]; i++)
 907         new_argv[i + 1] = old_argv[i];
 908     new_argv[i + 1] = NULL;
 909
 910     g_free (*argv);
 911     *argv = new_argv;
 912 }
 913
 914 static Session *
 915 create_guest_session (Seat *seat)
 916 {
 917     const gchar *session_name, *guest_wrapper;
 918     gchar *sessions_dir, **argv;
 919     SessionConfig *session_config;
 920     Session *session;
 921
 922     session_name = seat_get_string_property (seat, "user-session");
 923     sessions_dir = config_get_string (config_get_instance (), "LightDM", "sessions-directory");
 924     session_config = find_session_config (seat, sessions_dir, session_name);
 925     g_free (sessions_dir);
 926     if (!session_config)
 927     {
 928         l_debug (seat, "Can't find session '%s'", seat_get_string_property (seat, "user-session"));
 929         return NULL;
 930     }
 931
 932     session = create_session (seat, TRUE);
 933     configure_session (session, session_config, session_name, NULL);
 934     session_set_do_authenticate (session, TRUE);
 935     session_set_is_guest (session, TRUE);
 936     argv = get_session_argv (seat, session_config, seat_get_string_property (seat, "session-wrapper"));
 937     guest_wrapper = seat_get_string_property (seat, "guest-wrapper");
 938     if (guest_wrapper)
 939     {
 940         gchar *path;
 941         path = g_find_program_in_path (guest_wrapper);
 942         prepend_argv (&argv, path ? path : guest_wrapper);
 943         g_free (path);
 944     }
 945
 946     session_set_argv (session, argv);
 947     g_strfreev (argv);
 948     g_object_unref (session_config);
 949
 950     return session;
 951 }
 952
 953 static Session *
 954 greeter_create_session_cb (Greeter *greeter, Seat *seat)
 955 {
 956     Session *session;
 957
 958     session = create_session (seat, FALSE);
 959     session_set_session_type (session, session_get_session_type (SESSION (greeter)));
 960     session_set_display_server (session, session_get_display_server (SESSION (greeter)));
 961
 962     return g_object_ref (session);
 963 }
 964
 965 static gboolean
 966 greeter_start_session_cb (Greeter *greeter, SessionType type, const gchar *session_name, Seat *seat)
 967 {
 968     Session *session, *existing_session;
 969     const gchar *username;
 970     DisplayServer *display_server;
 971
 972     /* Get the session to use */
 973     if (greeter_get_guest_authenticated (greeter))
 974     {
 975         session = create_guest_session (seat);
 976         if (!session)
 977             return FALSE;
 978         session_set_pam_service (session, AUTOLOGIN_SERVICE);
 979     }
 980     else
 981     {
 982         const gchar *language = NULL;
 983         SessionConfig *session_config;
 984         User *user;
 985         gchar *sessions_dir = NULL;
 986         gchar **argv;
 987
 988         session = greeter_get_authentication_session (greeter);
 989
 990         /* Get session command to run */
 991         switch (type)
 992         {
 993         case SESSION_TYPE_LOCAL:
 994             sessions_dir = config_get_string (config_get_instance (), "LightDM", "sessions-directory");
 995             break;
 996         case SESSION_TYPE_REMOTE:
 997             sessions_dir = config_get_string (config_get_instance (), "LightDM", "remote-sessions-directory");
 998             break;
 999         }
1000
1001         /* Load user preferences */
1002         user = session_get_user (session);
1003         if (user)
1004         {
1005             if (!session_name)
1006                 session_name = user_get_xsession (user);
1007             language = user_get_language (user);
1008         }
1009
1010         if (!session_name)
1011             session_name = seat_get_string_property (seat, "user-session");
1012         if (user)
1013             user_set_xsession (session_get_user (session), session_name);
1014
1015         session_config = find_session_config (seat, sessions_dir, session_name);
1016         g_free (sessions_dir);
1017         if (!session_config)
1018         {
1019             l_debug (seat, "Can't find session '%s'", seat_get_string_property (seat, "user-session"));
1020             return FALSE;
1021         }
1022
1023         configure_session (session, session_config, session_name, language);
1024         argv = get_session_argv (seat, session_config, seat_get_string_property (seat, "session-wrapper"));
1025         session_set_argv (session, argv);
1026         g_strfreev (argv);
1027         g_object_unref (session_config);
1028     }
1029
1030     /* Switch to this session when it is ready */
1031     if (seat->priv->session_to_activate)
1032         g_object_unref (seat->priv->session_to_activate);
1033     seat->priv->session_to_activate = g_object_ref (session);
1034
1035     /* Return to existing session if it is open */
1036     username = session_get_username (session);
1037     existing_session = find_user_session (seat, username, NULL);
1038     if (existing_session && session != existing_session)
1039     {
1040         l_debug (seat, "Returning to existing user session %s", username);
1041         session_stop (session);
1042         session_unlock (existing_session);
1043         seat_set_active_session (seat, existing_session);
1044         return TRUE;
1045     }
1046
1047     /* If can re-use the display server, stop the greeter first */
1048     display_server = session_get_display_server (SESSION (greeter));
1049     if (can_share_display_server (seat, display_server) &&
1050         strcmp (display_server_get_session_type (display_server), session_get_session_type (session)) == 0)
1051     {
1052         l_debug (seat, "Stopping greeter; display server will be re-used for user session");
1053
1054         /* Run on the same display server after the greeter has stopped */
1055         session_set_display_server (session, display_server);
1056
1057         /* Stop the greeter */
1058         session_stop (SESSION (greeter));
1059
1060         return TRUE;
1061     }
1062     /* Otherwise start a new display server for this session */
1063     else
1064     {
1065         display_server = create_display_server (seat, session_get_session_type (session));
1066         session_set_display_server (session, display_server);
1067         if (!display_server_start (display_server))
1068         {
1069             l_debug (seat, "Failed to start display server for new session");
1070             return FALSE;
1071         }
1072
1073         return TRUE;
1074     }
1075 }
1076
1077 static Greeter *
1078 create_greeter_session (Seat *seat)
1079 {
1080     gchar *sessions_dir, **argv;
1081     SessionConfig *session_config;
1082     Greeter *greeter_session;
1083     const gchar *greeter_wrapper;
1084
1085     l_debug (seat, "Creating greeter session");
1086
1087     sessions_dir = config_get_string (config_get_instance (), "LightDM", "greeters-directory");
1088     session_config = find_session_config (seat, sessions_dir, seat_get_string_property (seat, "greeter-session"));
1089     g_free (sessions_dir);
1090     if (!session_config)
1091         return NULL;
1092
1093     argv = get_session_argv (seat, session_config, NULL);
1094     greeter_wrapper = seat_get_string_property (seat, "greeter-wrapper");
1095     if (greeter_wrapper)
1096     {
1097         gchar *path;
1098         path = g_find_program_in_path (greeter_wrapper);
1099         prepend_argv (&argv, path ? path : greeter_wrapper);
1100         g_free (path);
1101     }
1102
1103     greeter_session = SEAT_GET_CLASS (seat)->create_greeter_session (seat);
1104     session_set_session_type (SESSION (greeter_session), session_config_get_session_type (session_config));
1105     seat->priv->sessions = g_list_append (seat->priv->sessions, SESSION (greeter_session));
1106     g_signal_connect (greeter_session, "notify::active-username", G_CALLBACK (greeter_active_username_changed_cb), seat);
1107     g_signal_connect (greeter_session, "authentication-complete", G_CALLBACK (session_authentication_complete_cb), seat);
1108     g_signal_connect (greeter_session, "stopped", G_CALLBACK (session_stopped_cb), seat);
1109
1110     set_session_env (SESSION (greeter_session));
1111     session_set_env (SESSION (greeter_session), "XDG_SESSION_CLASS", "greeter");
1112
1113     session_set_pam_service (SESSION (greeter_session), GREETER_SERVICE);
1114     if (getuid () == 0)
1115     {
1116         gchar *greeter_user;
1117         greeter_user = config_get_string (config_get_instance (), "LightDM", "greeter-user");
1118         session_set_username (SESSION (greeter_session), greeter_user);
1119         g_free (greeter_user);
1120     }
1121     else
1122     {
1123         /* In test mode run the greeter as ourself */
1124         session_set_username (SESSION (greeter_session), user_get_name (accounts_get_current_user ()));
1125     }
1126     session_set_argv (SESSION (greeter_session), argv);
1127     g_strfreev (argv);
1128
1129     greeter_set_pam_services (greeter_session, USER_SERVICE, AUTOLOGIN_SERVICE);
1130     g_signal_connect (greeter_session, "create-session", G_CALLBACK (greeter_create_session_cb), seat);
1131     g_signal_connect (greeter_session, "start-session", G_CALLBACK (greeter_start_session_cb), seat);
1132
1133     /* Set hints to greeter */
1134     greeter_set_hint (greeter_session, "default-session", seat_get_string_property (seat, "user-session"));
1135     greeter_set_allow_guest (greeter_session, seat_get_allow_guest (seat));
1136     greeter_set_hint (greeter_session, "hide-users", seat_get_boolean_property (seat, "greeter-hide-users") ? "true" : "false");
1137     greeter_set_hint (greeter_session, "show-manual-login", seat_get_boolean_property (seat, "greeter-show-manual-login") ? "true" : "false");
1138     greeter_set_hint (greeter_session, "show-remote-login", seat_get_boolean_property (seat, "greeter-show-remote-login") ? "true" : "false");
1139     greeter_set_hint (greeter_session, "has-guest-account", seat_get_allow_guest (seat) && seat_get_boolean_property (seat, "greeter-allow-guest") ? "true" : "false");
1140
1141     g_object_unref (session_config);
1142
1143     return greeter_session;
1144 }
1145
1146 static Session *
1147 find_session_for_display_server (Seat *seat, DisplayServer *display_server)
1148 {
1149     GList *link;
1150
1151     for (link = seat->priv->sessions; link; link = link->next)
1152     {
1153         Session *session = link->data;
1154         if (session_get_display_server (session) == display_server && !session_get_is_stopping (session))
1155             return session;
1156     }
1157
1158     return NULL;
1159 }
1160
1161 static void
1162 display_server_ready_cb (DisplayServer *display_server, Seat *seat)
1163 {
1164     const gchar *script;
1165     Session *session;
1166
1167     /* Run setup script */
1168     script = seat_get_string_property (seat, "display-setup-script");
1169     if (script && !run_script (seat, display_server, script, NULL))
1170     {
1171         l_debug (seat, "Stopping display server due to failed setup script");
1172         display_server_stop (display_server);
1173         return;
1174     }
1175
1176     /* Stop if don't need to run a session */
1177     if (!get_start_local_sessions (seat))
1178         return;
1179
1180     emit_upstart_signal ("login-session-start");
1181
1182     /* Start the session waiting for this display server */
1183     session = find_session_for_display_server (seat, display_server);
1184     if (session)
1185     {
1186         if (session_get_is_authenticated (session))
1187         {
1188             l_debug (seat, "Display server ready, running session");
1189             run_session (seat, session);
1190         }
1191         else
1192         {
1193             l_debug (seat, "Display server ready, starting session authentication");
1194             start_session (seat, session);
1195         }
1196     }
1197     else
1198     {
1199         l_debug (seat, "Stopping not required display server");
1200         display_server_stop (display_server);
1201     }
1202 }
1203
1204 static DisplayServer *
1205 create_display_server (Seat *seat, const gchar *session_type)
1206 {
1207     DisplayServer *display_server;
1208
1209     l_debug (seat, "Creating display server of type %s", session_type);
1210
1211     display_server = SEAT_GET_CLASS (seat)->create_display_server (seat, session_type);
1212     if (!display_server)
1213         return NULL;
1214
1215     seat->priv->display_servers = g_list_append (seat->priv->display_servers, display_server);
1216     g_signal_connect (display_server, "ready", G_CALLBACK (display_server_ready_cb), seat);
1217     g_signal_connect (display_server, "stopped", G_CALLBACK (display_server_stopped_cb), seat);
1218
1219     return display_server;
1220 }
1221
1222 static Greeter *
1223 find_greeter_session (Seat *seat)
1224 {
1225     GList *link;
1226
1227     for (link = seat->priv->sessions; link; link = link->next)
1228     {
1229         Session *session = link->data;
1230         if (!session_get_is_stopping (session) && IS_GREETER (session))
1231             return GREETER (session);
1232     }
1233
1234     return NULL;
1235 }
1236
1237 gboolean
1238 seat_switch_to_greeter (Seat *seat)
1239 {
1240     Greeter *greeter_session;
1241     DisplayServer *display_server;
1242
1243     g_return_val_if_fail (seat != NULL, FALSE);
1244
1245     if (!seat->priv->can_switch)
1246         return FALSE;
1247
1248     /* Switch to greeter if one open (shouldn't be though) */
1249     greeter_session = find_greeter_session (seat);
1250     if (greeter_session)
1251     {
1252         l_debug (seat, "Switching to existing greeter");
1253         seat_set_active_session (seat, SESSION (greeter_session));
1254         return TRUE;
1255     }
1256
1257     greeter_session = create_greeter_session (seat);
1258     if (!greeter_session)
1259         return FALSE;
1260
1261     if (seat->priv->session_to_activate)
1262         g_object_unref (seat->priv->session_to_activate);
1263     seat->priv->session_to_activate = g_object_ref (greeter_session);
1264
1265     display_server = create_display_server (seat, session_get_session_type (SESSION (greeter_session)));
1266     session_set_display_server (SESSION (greeter_session), display_server);
1267     if (!display_server_start (display_server))
1268         return FALSE;
1269
1270     return TRUE;
1271 }
1272
1273 static void
1274 switch_authentication_complete_cb (Session *session, Seat *seat)
1275 {
1276     Greeter *greeter_session;
1277     DisplayServer *display_server;
1278
1279     /* If authenticated, then unlock existing session or start new one */
1280     if (session_get_is_authenticated (session))
1281     {
1282         Session *s;
1283
1284         s = find_user_session (seat, session_get_username (session), session);
1285         if (s)
1286         {
1287             l_debug (seat, "Session authenticated, switching to existing user session");
1288             session_unlock (s);
1289             seat_set_active_session (seat, s);
1290             session_stop (session);
1291         }
1292         else
1293         {
1294             l_debug (seat, "Session authenticated, starting display server");
1295             if (seat->priv->session_to_activate)
1296                 g_object_unref (seat->priv->session_to_activate);
1297             seat->priv->session_to_activate = g_object_ref (session);
1298             display_server = create_display_server (seat, session_get_session_type (session));
1299             session_set_display_server (session, display_server);
1300             display_server_start (display_server);
1301         }
1302
1303         return;
1304     }
1305
1306     l_debug (seat, "Switching to greeter to authenticate session");
1307
1308     session_stop (session);
1309
1310     greeter_session = create_greeter_session (seat);
1311     if (session_get_is_guest (session))
1312         greeter_set_hint (greeter_session, "select-guest", "true");
1313     else
1314         greeter_set_hint (greeter_session, "select-user", session_get_username (session));
1315     if (seat->priv->session_to_activate)
1316         g_object_unref (seat->priv->session_to_activate);
1317     seat->priv->session_to_activate = g_object_ref (greeter_session);
1318
1319     display_server = create_display_server (seat, session_get_session_type (SESSION (greeter_session)));
1320     session_set_display_server (SESSION (greeter_session), display_server);
1321     display_server_start (display_server);
1322 }
1323
1324 gboolean
1325 seat_switch_to_user (Seat *seat, const gchar *username, const gchar *session_name)
1326 {
1327     Session *session;
1328
1329     g_return_val_if_fail (seat != NULL, FALSE);
1330     g_return_val_if_fail (username != NULL, FALSE);
1331
1332     if (!seat->priv->can_switch)
1333         return FALSE;
1334
1335     /* If we're already on this session, then ignore */
1336     session = find_user_session (seat, username, NULL);
1337     if (session && session == seat->priv->active_session)
1338         return TRUE;
1339
1340     l_debug (seat, "Switching to user %s", username);
1341
1342     /* Attempt to authenticate them */
1343     session = create_user_session (seat, username, FALSE);
1344     g_signal_connect (session, "authentication-complete", G_CALLBACK (switch_authentication_complete_cb), seat);
1345     session_set_pam_service (session, USER_SERVICE);
1346     session_start (session);
1347
1348     return FALSE;
1349 }
1350
1351 static Session *
1352 find_guest_session (Seat *seat)
1353 {
1354     GList *link;
1355
1356     for (link = seat->priv->sessions; link; link = link->next)
1357     {
1358         Session *session = link->data;
1359         if (!session_get_is_stopping (session) && session_get_is_guest (session))
1360             return session;
1361     }
1362
1363     return NULL;
1364 }
1365
1366 gboolean
1367 seat_switch_to_guest (Seat *seat, const gchar *session_name)
1368 {
1369     Session *session;
1370     DisplayServer *display_server;
1371
1372     g_return_val_if_fail (seat != NULL, FALSE);
1373
1374     if (!seat->priv->can_switch || !seat_get_allow_guest (seat))
1375         return FALSE;
1376
1377     /* Switch to session if one open */
1378     session = find_guest_session (seat);
1379     if (session)
1380     {
1381         l_debug (seat, "Switching to existing guest account %s", session_get_username (session));
1382         seat_set_active_session (seat, session);
1383         return TRUE;
1384     }
1385
1386     session = create_guest_session (seat);
1387     if (!session)
1388         return FALSE;
1389
1390     display_server = create_display_server (seat, session_get_session_type (session));
1391
1392     if (seat->priv->session_to_activate)
1393         g_object_unref (seat->priv->session_to_activate);
1394     seat->priv->session_to_activate = g_object_ref (session);
1395     session_set_pam_service (session, AUTOLOGIN_SERVICE);
1396     session_set_display_server (session, display_server);
1397
1398     return display_server_start (display_server);
1399 }
1400
1401 gboolean
1402 seat_lock (Seat *seat, const gchar *username)
1403 {
1404     Greeter *greeter_session;
1405     DisplayServer *display_server;
1406
1407     g_return_val_if_fail (seat != NULL, FALSE);
1408
1409     if (!seat->priv->can_switch)
1410         return FALSE;
1411
1412     l_debug (seat, "Locking");
1413
1414     /* Switch to greeter if one open (shouldn't be though) */
1415     greeter_session = find_greeter_session (seat);
1416     if (greeter_session)
1417     {
1418         l_debug (seat, "Switching to existing greeter");
1419         seat_set_active_session (seat, SESSION (greeter_session));
1420         return TRUE;
1421     }
1422
1423     greeter_session = create_greeter_session (seat);
1424     if (!greeter_session)
1425         return FALSE;
1426
1427     display_server = create_display_server (seat, session_get_session_type (SESSION (greeter_session)));
1428
1429     if (seat->priv->session_to_activate)
1430         g_object_unref (seat->priv->session_to_activate);
1431     seat->priv->session_to_activate = g_object_ref (greeter_session);
1432     greeter_set_hint (greeter_session, "lock-screen", "true");
1433     if (username)
1434         greeter_set_hint (greeter_session, "select-user", username);
1435     session_set_display_server (SESSION (greeter_session), display_server);
1436
1437     return display_server_start (display_server);
1438 }
1439
1440 void
1441 seat_stop (Seat *seat)
1442 {
1443     g_return_if_fail (seat != NULL);
1444
1445     if (seat->priv->stopping)
1446         return;
1447
1448     l_debug (seat, "Stopping");
1449     seat->priv->stopping = TRUE;
1450     SEAT_GET_CLASS (seat)->stop (seat);
1451 }
1452
1453 gboolean
1454 seat_get_is_stopping (Seat *seat)
1455 {
1456     g_return_val_if_fail (seat != NULL, FALSE);
1457     return seat->priv->stopping;
1458 }
1459
1460 static gboolean
1461 seat_real_get_start_local_sessions (Seat *seat)
1462 {
1463     return TRUE;
1464 }
1465
1466 static void
1467 seat_real_setup (Seat *seat)
1468 {
1469 }
1470
1471 static gboolean
1472 seat_real_start (Seat *seat)
1473 {
1474     const gchar *autologin_username;
1475     int autologin_timeout;
1476     gboolean autologin_guest;
1477     gboolean autologin_in_background;
1478     Session *session = NULL, *background_session = NULL;
1479
1480     l_debug (seat, "Starting");
1481
1482     /* If this display server doesn't have a session running on it, just start it */
1483     if (!get_start_local_sessions (seat))
1484     {
1485         DisplayServer *display_server;
1486         display_server = create_display_server (seat, "x"); // FIXME: Not necessarily an X seat, but not sure what to put here
1487         return display_server_start (display_server);
1488     }
1489
1490     /* Get autologin settings */
1491     autologin_username = seat_get_string_property (seat, "autologin-user");
1492     if (g_strcmp0 (autologin_username, "") == 0)
1493         autologin_username = NULL;
1494     autologin_timeout = seat_get_integer_property (seat, "autologin-user-timeout");
1495     autologin_guest = seat_get_boolean_property (seat, "autologin-guest");
1496     autologin_in_background = seat_get_boolean_property (seat, "autologin-in-background");
1497
1498     /* Autologin if configured */
1499     if (autologin_timeout == 0 || autologin_in_background)
1500     {
1501         if (autologin_guest)
1502             session = create_guest_session (seat);
1503         else if (autologin_username != NULL)
1504             session = create_user_session (seat, autologin_username, TRUE);
1505
1506         if (session)
1507             session_set_pam_service (session, AUTOLOGIN_SERVICE);
1508
1509         /* Load in background if required */
1510         if (autologin_in_background && session)
1511         {
1512             background_session = session;
1513             session = NULL;
1514         }
1515
1516         if (session)
1517         {
1518             DisplayServer *display_server;
1519
1520             if (seat->priv->session_to_activate)
1521                 g_object_unref (seat->priv->session_to_activate);
1522             seat->priv->session_to_activate = g_object_ref (session);
1523
1524             display_server = create_display_server (seat, session_get_session_type (session));
1525             session_set_display_server (session, display_server);
1526             if (!display_server || !display_server_start (display_server))
1527             {
1528                 l_debug (seat, "Can't create display server for automatic login");
1529                 session_stop (session);
1530                 if (display_server)
1531                     display_server_stop (display_server);
1532                 session = NULL;
1533             }
1534         }
1535     }
1536
1537     /* Fallback to a greeter */
1538     if (!session)
1539     {
1540         Greeter *greeter_session;
1541         DisplayServer *display_server;
1542
1543         greeter_session = create_greeter_session (seat);
1544         if (!greeter_session)
1545         {
1546             l_debug (seat, "Failed to create greeter session");
1547             return FALSE;
1548         }
1549
1550         if (seat->priv->session_to_activate)
1551             g_object_unref (seat->priv->session_to_activate);
1552         seat->priv->session_to_activate = g_object_ref (greeter_session);
1553         session = SESSION (greeter_session);
1554
1555         if (autologin_timeout)
1556         {
1557             gchar *value;
1558
1559             value = g_strdup_printf ("%d", autologin_timeout);
1560             greeter_set_hint (greeter_session, "autologin-timeout", value);
1561             g_free (value);
1562             if (autologin_username)
1563                 greeter_set_hint (greeter_session, "autologin-user", autologin_username);
1564             if (autologin_guest)
1565                 greeter_set_hint (greeter_session, "autologin-guest", "true");
1566         }
1567
1568         display_server = create_display_server (seat, session_get_session_type (session));
1569         session_set_display_server (session, display_server);
1570         if (!display_server || !display_server_start (display_server))
1571         {
1572             l_debug (seat, "Can't create display server for greeter");
1573             session_stop (session);
1574             if (display_server)
1575                 display_server_stop (display_server);
1576             session = NULL;
1577         }
1578     }
1579
1580     /* Fail if can't start a session */
1581     if (!session)
1582     {
1583         seat_stop (seat);
1584         return FALSE;
1585     }
1586
1587     /* Start background session */
1588     if (background_session)
1589     {
1590         DisplayServer *background_display_server;
1591
1592         background_display_server = create_display_server (seat, session_get_session_type (background_session));
1593         session_set_display_server (background_session, background_display_server);
1594         if (!display_server_start (background_display_server))
1595             l_warning (seat, "Failed to start display server for background session");
1596     }
1597
1598     seat->priv->started = TRUE;
1599     return TRUE;
1600 }
1601
1602 static Greeter *
1603 seat_real_create_greeter_session (Seat *seat)
1604 {
1605     return greeter_new ();
1606 }
1607
1608 static Session *
1609 seat_real_create_session (Seat *seat)
1610 {
1611     return session_new ();
1612 }
1613
1614 static void
1615 seat_real_set_active_session (Seat *seat, Session *session)
1616 {
1617 }
1618
1619 static void
1620 seat_real_set_next_session (Seat *seat, Session *session)
1621 {
1622 }
1623
1624 static Session *
1625 seat_real_get_active_session (Seat *seat)
1626 {
1627     return NULL;
1628 }
1629
1630 static void
1631 seat_real_stop (Seat *seat)
1632 {
1633     GList *list, *link;
1634
1635     check_stopped (seat);
1636     if (seat->priv->stopped)
1637         return;
1638
1639     /* Stop all the display servers and sessions on the seat. Copy the list as
1640      * it might be modified if a display server / session stops during this loop */
1641     list = g_list_copy (seat->priv->display_servers);
1642     for (link = list; link; link = link->next)
1643         g_object_ref (link->data);
1644     for (link = list; link; link = link->next)
1645     {
1646         DisplayServer *display_server = link->data;
1647         if (!display_server_get_is_stopping (display_server))
1648         {
1649             l_debug (seat, "Stopping display server");
1650             display_server_stop (display_server);
1651         }
1652     }
1653     g_list_free_full (list, g_object_unref);
1654     list = g_list_copy (seat->priv->sessions);
1655     for (link = list; link; link = link->next)
1656         g_object_ref (link->data);
1657     for (link = list; link; link = link->next)
1658     {
1659         Session *session = link->data;
1660         if (!session_get_is_stopping (session))
1661         {
1662             l_debug (seat, "Stopping session");
1663             session_stop (session);
1664         }
1665     }
1666     g_list_free_full (list, g_object_unref);
1667 }
1668
1669 static void
1670 seat_init (Seat *seat)
1671 {
1672     seat->priv = G_TYPE_INSTANCE_GET_PRIVATE (seat, SEAT_TYPE, SeatPrivate);
1673     seat->priv->properties = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
1674     seat->priv->share_display_server = TRUE;
1675 }
1676
1677 static void
1678 seat_finalize (GObject *object)
1679 {
1680     Seat *self;
1681     GList *link;
1682
1683     self = SEAT (object);
1684
1685     g_hash_table_unref (self->priv->properties);
1686     for (link = self->priv->display_servers; link; link = link->next)
1687     {
1688         DisplayServer *display_server = link->data;
1689         g_signal_handlers_disconnect_matched (display_server, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
1690     }
1691     g_list_free_full (self->priv->display_servers, g_object_unref);
1692     for (link = self->priv->sessions; link; link = link->next)
1693     {
1694         Session *session = link->data;
1695         g_signal_handlers_disconnect_matched (session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
1696     }
1697     g_list_free_full (self->priv->sessions, g_object_unref);
1698     if (self->priv->active_session)
1699         g_object_unref (self->priv->active_session);
1700     if (self->priv->next_session)
1701         g_object_unref (self->priv->next_session);
1702     if (self->priv->session_to_activate)
1703         g_object_unref (self->priv->session_to_activate);
1704
1705     G_OBJECT_CLASS (seat_parent_class)->finalize (object);
1706 }
1707
1708 static void
1709 seat_class_init (SeatClass *klass)
1710 {
1711     GObjectClass *object_class = G_OBJECT_CLASS (klass);
1712
1713     klass->get_start_local_sessions = seat_real_get_start_local_sessions;
1714     klass->setup = seat_real_setup;
1715     klass->start = seat_real_start;
1716     klass->create_greeter_session = seat_real_create_greeter_session;
1717     klass->create_session = seat_real_create_session;
1718     klass->set_active_session = seat_real_set_active_session;
1719     klass->get_active_session = seat_real_get_active_session;
1720     klass->set_next_session = seat_real_set_next_session;
1721     klass->run_script = seat_real_run_script;
1722     klass->stop = seat_real_stop;
1723
1724     object_class->finalize = seat_finalize;
1725
1726     g_type_class_add_private (klass, sizeof (SeatPrivate));
1727
1728     signals[SESSION_ADDED] =
1729         g_signal_new ("session-added",
1730                       G_TYPE_FROM_CLASS (klass),
1731                       G_SIGNAL_RUN_LAST,
1732                       G_STRUCT_OFFSET (SeatClass, session_added),
1733                       NULL, NULL,
1734                       NULL,
1735                       G_TYPE_NONE, 1, SESSION_TYPE);
1736     signals[RUNNING_USER_SESSION] =
1737         g_signal_new ("running-user-session",
1738                       G_TYPE_FROM_CLASS (klass),
1739                       G_SIGNAL_RUN_LAST,
1740                       G_STRUCT_OFFSET (SeatClass, running_user_session),
1741                       NULL, NULL,
1742                       NULL,
1743                       G_TYPE_NONE, 1, SESSION_TYPE);
1744     signals[SESSION_REMOVED] =
1745         g_signal_new ("session-removed",
1746                       G_TYPE_FROM_CLASS (klass),
1747                       G_SIGNAL_RUN_LAST,
1748                       G_STRUCT_OFFSET (SeatClass, session_removed),
1749                       NULL, NULL,
1750                       NULL,
1751                       G_TYPE_NONE, 1, SESSION_TYPE);
1752     signals[STOPPED] =
1753         g_signal_new ("stopped",
1754                       G_TYPE_FROM_CLASS (klass),
1755                       G_SIGNAL_RUN_LAST,
1756                       G_STRUCT_OFFSET (SeatClass, stopped),
1757                       NULL, NULL,
1758                       NULL,
1759                       G_TYPE_NONE, 0);
1760 }
1761
1762 static gint
1763 seat_real_logprefix (Logger *self, gchar *buf, gulong buflen)
1764 {
1765     Seat *seat = SEAT (self);
1766     const gchar *name = seat_get_string_property (seat, "seat-name");
1767     if (name)
1768         return g_snprintf (buf, buflen, "Seat %s: ", name);
1769     else
1770         return g_snprintf (buf, buflen, "Seat: ");
1771 }
1772
1773 static void
1774 seat_logger_iface_init (LoggerInterface *iface)
1775 {
1776     iface->logprefix = &seat_real_logprefix;
1777 }