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"
26 struct XServerLocalPrivate
28 /* X server process */
29 Process *x_server_process;
34 /* Command to run the X server */
37 /* Config file to use */
40 /* Server layout to use */
43 /* TRUE if TCP/IP connections are allowed */
47 gchar *authority_file;
49 /* XDMCP server to connect to */
52 /* XDMCP port to connect to */
55 /* XDMCP key to use */
58 /* ID to report to Mir */
61 /* Filename of socket Mir is listening on */
64 /* TRUE when received ready signal */
71 /* Background to set */
75 G_DEFINE_TYPE (XServerLocal, x_server_local, X_SERVER_TYPE);
77 static GList *display_numbers = NULL;
80 display_number_in_use (guint display_number)
87 /* See if we know we are managing a server with that number */
88 for (link = display_numbers; link; link = link->next)
90 guint number = GPOINTER_TO_UINT (link->data);
91 if (number == display_number)
95 /* See if an X server that we don't know of has a lock on that number */
96 path = g_strdup_printf ("/tmp/.X%d-lock", display_number);
97 exists = g_file_test (path, G_FILE_TEST_EXISTS);
102 /* See if that lock file is valid, ignore it if the contents are invalid or the process doesn't exist */
103 if (g_file_get_contents (path, &data, NULL, NULL))
107 pid = atoi (g_strstrip (data));
112 if (kill (pid, 0) < 0 && errno == ESRCH)
120 x_server_local_get_unused_display_number (void)
124 number = config_get_integer (config_get_instance (), "LightDM", "minimum-display-number");
125 while (display_number_in_use (number))
128 display_numbers = g_list_append (display_numbers, GUINT_TO_POINTER (number));
134 x_server_local_release_display_number (guint display_number)
137 for (link = display_numbers; link; link = link->next)
139 guint number = GPOINTER_TO_UINT (link->data);
140 if (number == display_number)
142 display_numbers = g_list_remove_link (display_numbers, link);
149 x_server_local_new (void)
151 XServerLocal *self = g_object_new (X_SERVER_LOCAL_TYPE, NULL);
152 gchar hostname[1024], *number, *name;
154 x_server_set_display_number (X_SERVER (self), x_server_local_get_unused_display_number ());
156 gethostname (hostname, 1024);
157 number = g_strdup_printf ("%d", x_server_get_display_number (X_SERVER (self)));
158 x_server_set_authority (X_SERVER (self), x_authority_new_cookie (XAUTH_FAMILY_LOCAL, (guint8*) hostname, strlen (hostname), number));
161 name = g_strdup_printf ("x-%d", x_server_get_display_number (X_SERVER (self)));
162 display_server_set_name (DISPLAY_SERVER (self), name);
169 x_server_local_set_command (XServerLocal *server, const gchar *command)
171 g_return_if_fail (server != NULL);
172 g_free (server->priv->command);
173 server->priv->command = g_strdup (command);
177 x_server_local_set_vt (XServerLocal *server, gint vt)
179 g_return_if_fail (server != NULL);
180 if (server->priv->vt > 0)
181 vt_unref (server->priv->vt);
182 server->priv->have_vt_ref = FALSE;
183 server->priv->vt = vt;
187 server->priv->have_vt_ref = TRUE;
192 x_server_local_set_config (XServerLocal *server, const gchar *path)
194 g_return_if_fail (server != NULL);
195 g_free (server->priv->config_file);
196 server->priv->config_file = g_strdup (path);
200 x_server_local_set_layout (XServerLocal *server, const gchar *layout)
202 g_return_if_fail (server != NULL);
203 g_free (server->priv->layout);
204 server->priv->layout = g_strdup (layout);
208 x_server_local_set_allow_tcp (XServerLocal *server, gboolean allow_tcp)
210 g_return_if_fail (server != NULL);
211 server->priv->allow_tcp = allow_tcp;
215 x_server_local_set_xdmcp_server (XServerLocal *server, const gchar *hostname)
217 g_return_if_fail (server != NULL);
218 g_free (server->priv->xdmcp_server);
219 server->priv->xdmcp_server = g_strdup (hostname);
223 x_server_local_get_xdmcp_server (XServerLocal *server)
225 g_return_val_if_fail (server != NULL, 0);
226 return server->priv->xdmcp_server;
230 x_server_local_set_xdmcp_port (XServerLocal *server, guint port)
232 g_return_if_fail (server != NULL);
233 server->priv->xdmcp_port = port;
237 x_server_local_get_xdmcp_port (XServerLocal *server)
239 g_return_val_if_fail (server != NULL, 0);
240 return server->priv->xdmcp_port;
244 x_server_local_set_xdmcp_key (XServerLocal *server, const gchar *key)
246 g_return_if_fail (server != NULL);
247 g_free (server->priv->xdmcp_key);
248 server->priv->xdmcp_key = g_strdup (key);
249 x_server_set_authority (X_SERVER (server), NULL);
253 x_server_local_set_background (XServerLocal *server, const gchar *background)
255 g_return_if_fail (server != NULL);
256 g_free (server->priv->background);
257 server->priv->background = g_strdup (background);
261 x_server_local_set_mir_id (XServerLocal *server, const gchar *id)
263 g_return_if_fail (server != NULL);
264 g_free (server->priv->mir_id);
265 server->priv->mir_id = g_strdup (id);
268 const gchar *x_server_local_get_mir_id (XServerLocal *server)
270 g_return_val_if_fail (server != NULL, NULL);
271 return server->priv->mir_id;
275 x_server_local_set_mir_socket (XServerLocal *server, const gchar *socket)
277 g_return_if_fail (server != NULL);
278 g_free (server->priv->mir_socket);
279 server->priv->mir_socket = g_strdup (socket);
283 x_server_local_get_can_share (DisplayServer *server)
289 x_server_local_get_vt (DisplayServer *server)
291 g_return_val_if_fail (server != NULL, 0);
292 return X_SERVER_LOCAL (server)->priv->vt;
296 x_server_local_get_authority_file_path (XServerLocal *server)
298 g_return_val_if_fail (server != NULL, 0);
299 return server->priv->authority_file;
303 get_absolute_command (const gchar *command)
306 gchar *absolute_binary, *absolute_command = NULL;
308 tokens = g_strsplit (command, " ", 2);
310 absolute_binary = g_find_program_in_path (tokens[0]);
314 absolute_command = g_strjoin (" ", absolute_binary, tokens[1], NULL);
316 absolute_command = g_strdup (absolute_binary);
318 g_free (absolute_binary);
322 return absolute_command;
326 run_cb (Process *process, XServerLocal *server)
330 /* Make input non-blocking */
331 fd = open ("/dev/null", O_RDONLY);
332 dup2 (fd, STDIN_FILENO);
335 /* Redirect output to logfile */
336 if (server->priv->log_file)
340 fd = g_open (server->priv->log_file, O_WRONLY | O_CREAT | O_TRUNC, 0600);
342 g_warning ("Failed to open log file %s: %s", server->priv->log_file, g_strerror (errno));
345 dup2 (fd, STDOUT_FILENO);
346 dup2 (fd, STDERR_FILENO);
351 /* Set SIGUSR1 to ignore so the X server can indicate it when it is ready */
352 signal (SIGUSR1, SIG_IGN);
356 got_signal_cb (Process *process, int signum, XServerLocal *server)
358 if (signum == SIGUSR1 && !server->priv->got_signal)
360 server->priv->got_signal = TRUE;
361 g_debug ("Got signal from X server :%d", x_server_get_display_number (X_SERVER (server)));
363 // FIXME: Check return value
364 DISPLAY_SERVER_CLASS (x_server_local_parent_class)->start (DISPLAY_SERVER (server));
369 stopped_cb (Process *process, XServerLocal *server)
371 g_debug ("X server stopped");
373 /* Release VT and display number for re-use */
374 if (server->priv->have_vt_ref)
376 vt_unref (server->priv->vt);
377 server->priv->have_vt_ref = FALSE;
379 x_server_local_release_display_number (x_server_get_display_number (X_SERVER (server)));
381 if (x_server_get_authority (X_SERVER (server)) && server->priv->authority_file)
383 g_debug ("Removing X server authority %s", server->priv->authority_file);
385 g_unlink (server->priv->authority_file);
387 g_free (server->priv->authority_file);
388 server->priv->authority_file = NULL;
391 DISPLAY_SERVER_CLASS (x_server_local_parent_class)->stop (DISPLAY_SERVER (server));
395 write_authority_file (XServerLocal *server)
397 XAuthority *authority;
398 GError *error = NULL;
400 authority = x_server_get_authority (X_SERVER (server));
404 /* Get file to write to if have authority */
405 if (!server->priv->authority_file)
407 gchar *run_dir, *dir;
409 run_dir = config_get_string (config_get_instance (), "LightDM", "run-directory");
410 dir = g_build_filename (run_dir, "root", NULL);
412 if (g_mkdir_with_parents (dir, S_IRWXU) < 0)
413 g_warning ("Failed to make authority directory %s: %s", dir, strerror (errno));
415 server->priv->authority_file = g_build_filename (dir, x_server_get_address (X_SERVER (server)), NULL);
419 g_debug ("Writing X server authority to %s", server->priv->authority_file);
421 x_authority_write (authority, XAUTH_WRITE_MODE_REPLACE, server->priv->authority_file, &error);
423 g_warning ("Failed to write authority: %s", error->message);
424 g_clear_error (&error);
428 x_server_local_start (DisplayServer *display_server)
430 XServerLocal *server = X_SERVER_LOCAL (display_server);
432 gchar *filename, *dir, *absolute_command;
435 g_return_val_if_fail (server->priv->x_server_process == NULL, FALSE);
437 server->priv->got_signal = FALSE;
439 g_return_val_if_fail (server->priv->command != NULL, FALSE);
441 server->priv->x_server_process = process_new ();
442 process_set_clear_environment (server->priv->x_server_process, TRUE);
443 g_signal_connect (server->priv->x_server_process, "run", G_CALLBACK (run_cb), server);
444 g_signal_connect (server->priv->x_server_process, "got-signal", G_CALLBACK (got_signal_cb), server);
445 g_signal_connect (server->priv->x_server_process, "stopped", G_CALLBACK (stopped_cb), server);
448 filename = g_strdup_printf ("%s.log", display_server_get_name (display_server));
449 dir = config_get_string (config_get_instance (), "LightDM", "log-directory");
450 server->priv->log_file = g_build_filename (dir, filename, NULL);
451 g_debug ("Logging to %s", server->priv->log_file);
455 absolute_command = get_absolute_command (server->priv->command);
456 if (!absolute_command)
458 g_debug ("Can't launch X server %s, not found in path", server->priv->command);
459 stopped_cb (server->priv->x_server_process, X_SERVER_LOCAL (server));
462 command = g_string_new (absolute_command);
463 g_free (absolute_command);
465 g_string_append_printf (command, " :%d", x_server_get_display_number (X_SERVER (server)));
467 if (server->priv->config_file)
468 g_string_append_printf (command, " -config %s", server->priv->config_file);
470 if (server->priv->layout)
471 g_string_append_printf (command, " -layout %s", server->priv->layout);
473 write_authority_file (server);
474 if (server->priv->authority_file)
475 g_string_append_printf (command, " -auth %s", server->priv->authority_file);
477 /* Setup for running inside Mir */
478 if (server->priv->mir_id)
479 g_string_append_printf (command, " -mir %s", server->priv->mir_id);
481 if (server->priv->mir_socket)
482 g_string_append_printf (command, " -mirSocket %s", server->priv->mir_socket);
484 /* Connect to a remote server using XDMCP */
485 if (server->priv->xdmcp_server != NULL)
487 if (server->priv->xdmcp_port != 0)
488 g_string_append_printf (command, " -port %d", server->priv->xdmcp_port);
489 g_string_append_printf (command, " -query %s", server->priv->xdmcp_server);
490 if (server->priv->xdmcp_key)
491 g_string_append_printf (command, " -cookie %s", server->priv->xdmcp_key);
493 else if (!server->priv->allow_tcp)
494 g_string_append (command, " -nolisten tcp");
496 if (server->priv->vt >= 0)
497 g_string_append_printf (command, " vt%d -novtswitch", server->priv->vt);
499 if (server->priv->background)
500 g_string_append_printf (command, " -background %s", server->priv->background);
502 process_set_command (server->priv->x_server_process, command->str);
503 g_string_free (command, TRUE);
505 g_debug ("Launching X Server");
507 /* If running inside another display then pass through those variables */
508 if (g_getenv ("DISPLAY"))
510 process_set_env (server->priv->x_server_process, "DISPLAY", g_getenv ("DISPLAY"));
511 if (g_getenv ("XAUTHORITY"))
512 process_set_env (server->priv->x_server_process, "XAUTHORITY", g_getenv ("XAUTHORITY"));
516 path = g_build_filename (g_get_home_dir (), ".Xauthority", NULL);
517 process_set_env (server->priv->x_server_process, "XAUTHORITY", path);
522 /* Variable required for regression tests */
523 if (g_getenv ("LIGHTDM_TEST_ROOT"))
525 process_set_env (server->priv->x_server_process, "LIGHTDM_TEST_ROOT", g_getenv ("LIGHTDM_TEST_ROOT"));
526 process_set_env (server->priv->x_server_process, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
527 process_set_env (server->priv->x_server_process, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
530 result = process_start (server->priv->x_server_process, FALSE);
533 g_debug ("Waiting for ready signal from X server :%d", x_server_get_display_number (X_SERVER (server)));
536 stopped_cb (server->priv->x_server_process, X_SERVER_LOCAL (server));
542 x_server_local_stop (DisplayServer *server)
544 process_stop (X_SERVER_LOCAL (server)->priv->x_server_process);
548 x_server_local_init (XServerLocal *server)
550 server->priv = G_TYPE_INSTANCE_GET_PRIVATE (server, X_SERVER_LOCAL_TYPE, XServerLocalPrivate);
551 server->priv->vt = -1;
552 server->priv->command = g_strdup ("X");
556 x_server_local_finalize (GObject *object)
560 self = X_SERVER_LOCAL (object);
562 if (self->priv->x_server_process)
564 g_signal_handlers_disconnect_matched (self->priv->x_server_process, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
565 g_object_unref (self->priv->x_server_process);
567 g_free (self->priv->log_file);
568 g_free (self->priv->command);
569 g_free (self->priv->config_file);
570 g_free (self->priv->layout);
571 g_free (self->priv->xdmcp_server);
572 g_free (self->priv->xdmcp_key);
573 g_free (self->priv->mir_id);
574 g_free (self->priv->mir_socket);
575 g_free (self->priv->authority_file);
576 if (self->priv->vt > 0)
577 vt_unref (self->priv->vt);
578 g_free (self->priv->background);
580 G_OBJECT_CLASS (x_server_local_parent_class)->finalize (object);
584 x_server_local_class_init (XServerLocalClass *klass)
586 GObjectClass *object_class = G_OBJECT_CLASS (klass);
587 DisplayServerClass *display_server_class = DISPLAY_SERVER_CLASS (klass);
589 display_server_class->get_can_share = x_server_local_get_can_share;
590 display_server_class->get_vt = x_server_local_get_vt;
591 display_server_class->start = x_server_local_start;
592 display_server_class->stop = x_server_local_stop;
593 object_class->finalize = x_server_local_finalize;
595 g_type_class_add_private (klass, sizeof (XServerLocalPrivate));