2 * Copyright (C) 2010-2011 Robert Ancell.
3 * Author: Robert Ancell <robert.ancell@canonical.com>
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
18 #include <glib/gstdio.h>
21 #include "x-server-local.h"
22 #include "configuration.h"
27 struct XServerLocalPrivate
29 /* X server process */
30 Process *x_server_process;
35 /* Command to run the X server */
38 /* Config file to use */
41 /* Server layout to use */
44 /* TRUE if TCP/IP connections are allowed */
48 gchar *authority_file;
50 /* XDMCP server to connect to */
53 /* XDMCP port to connect to */
56 /* XDMCP key to use */
59 /* ID to report to Mir */
62 /* Filename of socket Mir is listening on */
65 /* TRUE when received ready signal */
71 /* TRUE if holding a reference to the VT */
74 /* TRUE if replacing Plymouth */
75 gboolean replacing_plymouth;
78 G_DEFINE_TYPE (XServerLocal, x_server_local, X_SERVER_TYPE);
80 static GList *display_numbers = NULL;
83 display_number_in_use (guint display_number)
90 /* See if we know we are managing a server with that number */
91 for (link = display_numbers; link; link = link->next)
93 guint number = GPOINTER_TO_UINT (link->data);
94 if (number == display_number)
98 /* See if an X server that we don't know of has a lock on that number */
99 path = g_strdup_printf ("/tmp/.X%d-lock", display_number);
100 exists = g_file_test (path, G_FILE_TEST_EXISTS);
105 /* See if that lock file is valid, ignore it if the contents are invalid or the process doesn't exist */
106 if (g_file_get_contents (path, &data, NULL, NULL))
110 pid = atoi (g_strstrip (data));
115 if (kill (pid, 0) < 0 && errno == ESRCH)
123 x_server_local_get_unused_display_number (void)
127 number = config_get_integer (config_get_instance (), "LightDM", "minimum-display-number");
128 while (display_number_in_use (number))
131 display_numbers = g_list_append (display_numbers, GUINT_TO_POINTER (number));
137 x_server_local_release_display_number (guint display_number)
140 for (link = display_numbers; link; link = link->next)
142 guint number = GPOINTER_TO_UINT (link->data);
143 if (number == display_number)
145 display_numbers = g_list_remove_link (display_numbers, link);
152 x_server_local_new (void)
154 XServerLocal *self = g_object_new (X_SERVER_LOCAL_TYPE, NULL);
155 gchar hostname[1024], *number, *name;
157 x_server_set_display_number (X_SERVER (self), x_server_local_get_unused_display_number ());
159 gethostname (hostname, 1024);
160 number = g_strdup_printf ("%d", x_server_get_display_number (X_SERVER (self)));
161 x_server_set_authority (X_SERVER (self), x_authority_new_cookie (XAUTH_FAMILY_LOCAL, (guint8*) hostname, strlen (hostname), number));
164 name = g_strdup_printf ("x-%d", x_server_get_display_number (X_SERVER (self)));
165 display_server_set_name (DISPLAY_SERVER (self), name);
168 /* Replace Plymouth if it is running */
169 if (plymouth_get_is_active () && plymouth_has_active_vt ())
171 gint active_vt = vt_get_active ();
172 if (active_vt >= vt_get_min ())
174 g_debug ("X server %s will replace Plymouth", x_server_get_address (X_SERVER (self)));
175 self->priv->replacing_plymouth = TRUE;
176 self->priv->vt = active_vt;
177 plymouth_deactivate ();
180 g_debug ("Plymouth is running on VT %d, but this is less than the configured minimum of %d so not replacing it", active_vt, vt_get_min ());
182 if (self->priv->vt < 0)
183 self->priv->vt = vt_get_unused ();
184 if (self->priv->vt >= 0)
186 vt_ref (self->priv->vt);
187 self->priv->have_vt_ref = TRUE;
194 x_server_local_set_command (XServerLocal *server, const gchar *command)
196 g_return_if_fail (server != NULL);
197 g_free (server->priv->command);
198 server->priv->command = g_strdup (command);
202 x_server_local_set_config (XServerLocal *server, const gchar *path)
204 g_return_if_fail (server != NULL);
205 g_free (server->priv->config_file);
206 server->priv->config_file = g_strdup (path);
210 x_server_local_set_layout (XServerLocal *server, const gchar *layout)
212 g_return_if_fail (server != NULL);
213 g_free (server->priv->layout);
214 server->priv->layout = g_strdup (layout);
218 x_server_local_set_allow_tcp (XServerLocal *server, gboolean allow_tcp)
220 g_return_if_fail (server != NULL);
221 server->priv->allow_tcp = allow_tcp;
225 x_server_local_set_xdmcp_server (XServerLocal *server, const gchar *hostname)
227 g_return_if_fail (server != NULL);
228 g_free (server->priv->xdmcp_server);
229 server->priv->xdmcp_server = g_strdup (hostname);
230 display_server_set_start_local_sessions (DISPLAY_SERVER (server), hostname == NULL);
234 x_server_local_get_xdmcp_server (XServerLocal *server)
236 g_return_val_if_fail (server != NULL, 0);
237 return server->priv->xdmcp_server;
241 x_server_local_set_xdmcp_port (XServerLocal *server, guint port)
243 g_return_if_fail (server != NULL);
244 server->priv->xdmcp_port = port;
248 x_server_local_get_xdmcp_port (XServerLocal *server)
250 g_return_val_if_fail (server != NULL, 0);
251 return server->priv->xdmcp_port;
255 x_server_local_set_xdmcp_key (XServerLocal *server, const gchar *key)
257 g_return_if_fail (server != NULL);
258 g_free (server->priv->xdmcp_key);
259 server->priv->xdmcp_key = g_strdup (key);
260 x_server_set_authority (X_SERVER (server), NULL);
264 x_server_local_set_mir_id (XServerLocal *server, const gchar *id)
266 g_return_if_fail (server != NULL);
267 g_free (server->priv->mir_id);
268 server->priv->mir_id = g_strdup (id);
270 if (server->priv->have_vt_ref)
272 vt_unref (server->priv->vt);
273 server->priv->have_vt_ref = FALSE;
275 server->priv->vt = -1;
278 const gchar *x_server_local_get_mir_id (XServerLocal *server)
280 g_return_val_if_fail (server != NULL, NULL);
281 return server->priv->mir_id;
285 x_server_local_set_mir_socket (XServerLocal *server, const gchar *socket)
287 g_return_if_fail (server != NULL);
288 g_free (server->priv->mir_socket);
289 server->priv->mir_socket = g_strdup (socket);
293 x_server_local_get_vt (DisplayServer *server)
295 g_return_val_if_fail (server != NULL, 0);
296 return X_SERVER_LOCAL (server)->priv->vt;
300 x_server_local_get_authority_file_path (XServerLocal *server)
302 g_return_val_if_fail (server != NULL, 0);
303 return server->priv->authority_file;
307 get_absolute_command (const gchar *command)
310 gchar *absolute_binary, *absolute_command = NULL;
312 tokens = g_strsplit (command, " ", 2);
314 absolute_binary = g_find_program_in_path (tokens[0]);
318 absolute_command = g_strjoin (" ", absolute_binary, tokens[1], NULL);
320 absolute_command = g_strdup (absolute_binary);
322 g_free (absolute_binary);
326 return absolute_command;
330 run_cb (Process *process, XServerLocal *server)
334 /* Make input non-blocking */
335 fd = open ("/dev/null", O_RDONLY);
336 dup2 (fd, STDIN_FILENO);
339 /* Redirect output to logfile */
340 if (server->priv->log_file)
344 fd = g_open (server->priv->log_file, O_WRONLY | O_CREAT | O_TRUNC, 0600);
346 g_warning ("Failed to open log file %s: %s", server->priv->log_file, g_strerror (errno));
349 dup2 (fd, STDOUT_FILENO);
350 dup2 (fd, STDERR_FILENO);
355 /* Set SIGUSR1 to ignore so the X server can indicate it when it is ready */
356 signal (SIGUSR1, SIG_IGN);
360 got_signal_cb (Process *process, int signum, XServerLocal *server)
362 if (signum == SIGUSR1 && !server->priv->got_signal)
364 server->priv->got_signal = TRUE;
365 g_debug ("Got signal from X server :%d", x_server_get_display_number (X_SERVER (server)));
367 if (server->priv->replacing_plymouth)
369 g_debug ("Stopping Plymouth, X server is ready");
370 server->priv->replacing_plymouth = FALSE;
371 plymouth_quit (TRUE);
374 // FIXME: Check return value
375 DISPLAY_SERVER_CLASS (x_server_local_parent_class)->start (DISPLAY_SERVER (server));
380 stopped_cb (Process *process, XServerLocal *server)
382 g_debug ("X server stopped");
384 x_server_local_release_display_number (x_server_get_display_number (X_SERVER (server)));
386 if (x_server_get_authority (X_SERVER (server)) && server->priv->authority_file)
388 g_debug ("Removing X server authority %s", server->priv->authority_file);
390 g_unlink (server->priv->authority_file);
392 g_free (server->priv->authority_file);
393 server->priv->authority_file = NULL;
396 if (server->priv->have_vt_ref)
398 vt_unref (server->priv->vt);
399 server->priv->have_vt_ref = FALSE;
402 if (server->priv->replacing_plymouth && plymouth_get_is_running ())
404 g_debug ("Stopping Plymouth, X server failed to start");
405 server->priv->replacing_plymouth = FALSE;
406 plymouth_quit (FALSE);
409 DISPLAY_SERVER_CLASS (x_server_local_parent_class)->stop (DISPLAY_SERVER (server));
413 write_authority_file (XServerLocal *server)
415 XAuthority *authority;
416 GError *error = NULL;
418 authority = x_server_get_authority (X_SERVER (server));
422 /* Get file to write to if have authority */
423 if (!server->priv->authority_file)
425 gchar *run_dir, *dir;
427 run_dir = config_get_string (config_get_instance (), "LightDM", "run-directory");
428 dir = g_build_filename (run_dir, "root", NULL);
430 if (g_mkdir_with_parents (dir, S_IRWXU) < 0)
431 g_warning ("Failed to make authority directory %s: %s", dir, strerror (errno));
433 server->priv->authority_file = g_build_filename (dir, x_server_get_address (X_SERVER (server)), NULL);
437 g_debug ("Writing X server authority to %s", server->priv->authority_file);
439 x_authority_write (authority, XAUTH_WRITE_MODE_REPLACE, server->priv->authority_file, &error);
441 g_warning ("Failed to write authority: %s", error->message);
442 g_clear_error (&error);
446 x_server_local_start (DisplayServer *display_server)
448 XServerLocal *server = X_SERVER_LOCAL (display_server);
450 gchar *filename, *dir, *absolute_command;
453 g_return_val_if_fail (server->priv->x_server_process == NULL, FALSE);
455 server->priv->got_signal = FALSE;
457 g_return_val_if_fail (server->priv->command != NULL, FALSE);
459 server->priv->x_server_process = process_new ();
460 process_set_clear_environment (server->priv->x_server_process, TRUE);
461 g_signal_connect (server->priv->x_server_process, "run", G_CALLBACK (run_cb), server);
462 g_signal_connect (server->priv->x_server_process, "got-signal", G_CALLBACK (got_signal_cb), server);
463 g_signal_connect (server->priv->x_server_process, "stopped", G_CALLBACK (stopped_cb), server);
466 filename = g_strdup_printf ("%s.log", display_server_get_name (display_server));
467 dir = config_get_string (config_get_instance (), "LightDM", "log-directory");
468 server->priv->log_file = g_build_filename (dir, filename, NULL);
469 g_debug ("Logging to %s", server->priv->log_file);
473 absolute_command = get_absolute_command (server->priv->command);
474 if (!absolute_command)
476 g_debug ("Can't launch X server %s, not found in path", server->priv->command);
477 stopped_cb (server->priv->x_server_process, X_SERVER_LOCAL (server));
480 command = g_string_new (absolute_command);
481 g_free (absolute_command);
483 g_string_append_printf (command, " :%d", x_server_get_display_number (X_SERVER (server)));
485 if (server->priv->config_file)
486 g_string_append_printf (command, " -config %s", server->priv->config_file);
488 if (server->priv->layout)
489 g_string_append_printf (command, " -layout %s", server->priv->layout);
491 write_authority_file (server);
492 if (server->priv->authority_file)
493 g_string_append_printf (command, " -auth %s", server->priv->authority_file);
495 /* Setup for running inside Mir */
496 if (server->priv->mir_id)
497 g_string_append_printf (command, " -mir %s", server->priv->mir_id);
499 if (server->priv->mir_socket)
500 g_string_append_printf (command, " -mirSocket %s", server->priv->mir_socket);
502 /* Connect to a remote server using XDMCP */
503 if (server->priv->xdmcp_server != NULL)
505 if (server->priv->xdmcp_port != 0)
506 g_string_append_printf (command, " -port %d", server->priv->xdmcp_port);
507 g_string_append_printf (command, " -query %s", server->priv->xdmcp_server);
508 if (server->priv->xdmcp_key)
509 g_string_append_printf (command, " -cookie %s", server->priv->xdmcp_key);
511 else if (!server->priv->allow_tcp)
512 g_string_append (command, " -nolisten tcp");
514 if (server->priv->vt >= 0)
515 g_string_append_printf (command, " vt%d -novtswitch", server->priv->vt);
517 if (server->priv->replacing_plymouth)
518 g_string_append (command, " -background none");
519 process_set_command (server->priv->x_server_process, command->str);
520 g_string_free (command, TRUE);
522 g_debug ("Launching X Server");
524 /* If running inside another display then pass through those variables */
525 if (g_getenv ("DISPLAY"))
527 process_set_env (server->priv->x_server_process, "DISPLAY", g_getenv ("DISPLAY"));
528 if (g_getenv ("XAUTHORITY"))
529 process_set_env (server->priv->x_server_process, "XAUTHORITY", g_getenv ("XAUTHORITY"));
533 path = g_build_filename (g_get_home_dir (), ".Xauthority", NULL);
534 process_set_env (server->priv->x_server_process, "XAUTHORITY", path);
539 /* Variable required for regression tests */
540 if (g_getenv ("LIGHTDM_TEST_ROOT"))
542 process_set_env (server->priv->x_server_process, "LIGHTDM_TEST_ROOT", g_getenv ("LIGHTDM_TEST_ROOT"));
543 process_set_env (server->priv->x_server_process, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
544 process_set_env (server->priv->x_server_process, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
547 result = process_start (server->priv->x_server_process, FALSE);
550 g_debug ("Waiting for ready signal from X server :%d", x_server_get_display_number (X_SERVER (server)));
553 stopped_cb (server->priv->x_server_process, X_SERVER_LOCAL (server));
559 x_server_local_stop (DisplayServer *server)
561 process_stop (X_SERVER_LOCAL (server)->priv->x_server_process);
565 x_server_local_init (XServerLocal *server)
567 server->priv = G_TYPE_INSTANCE_GET_PRIVATE (server, X_SERVER_LOCAL_TYPE, XServerLocalPrivate);
568 server->priv->vt = -1;
569 server->priv->command = g_strdup ("X");
573 x_server_local_finalize (GObject *object)
577 self = X_SERVER_LOCAL (object);
579 if (self->priv->x_server_process)
581 g_signal_handlers_disconnect_matched (self->priv->x_server_process, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
582 g_object_unref (self->priv->x_server_process);
584 g_free (self->priv->log_file);
585 g_free (self->priv->command);
586 g_free (self->priv->config_file);
587 g_free (self->priv->layout);
588 g_free (self->priv->xdmcp_server);
589 g_free (self->priv->xdmcp_key);
590 g_free (self->priv->mir_id);
591 g_free (self->priv->mir_socket);
592 g_free (self->priv->authority_file);
593 if (self->priv->have_vt_ref)
594 vt_unref (self->priv->vt);
596 G_OBJECT_CLASS (x_server_local_parent_class)->finalize (object);
600 x_server_local_class_init (XServerLocalClass *klass)
602 GObjectClass *object_class = G_OBJECT_CLASS (klass);
603 DisplayServerClass *display_server_class = DISPLAY_SERVER_CLASS (klass);
605 display_server_class->get_vt = x_server_local_get_vt;
606 display_server_class->start = x_server_local_start;
607 display_server_class->stop = x_server_local_stop;
608 object_class->finalize = x_server_local_finalize;
610 g_type_class_add_private (klass, sizeof (XServerLocalPrivate));