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;
31 /* Command to run the X server */
34 /* Config file to use */
37 /* Server layout to use */
40 /* Value for -seat argument */
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 in_use = g_file_test (path, G_FILE_TEST_EXISTS);
99 /* See if that lock file is valid, ignore it if the contents are invalid or the process doesn't exist */
100 if (in_use && g_file_get_contents (path, &data, NULL, NULL))
104 pid = atoi (g_strstrip (data));
108 if (pid < 0 || (kill (pid, 0) < 0 && errno == ESRCH))
118 x_server_local_get_unused_display_number (void)
122 number = config_get_integer (config_get_instance (), "LightDM", "minimum-display-number");
123 while (display_number_in_use (number))
126 display_numbers = g_list_append (display_numbers, GUINT_TO_POINTER (number));
132 x_server_local_release_display_number (guint display_number)
135 for (link = display_numbers; link; link = link->next)
137 guint number = GPOINTER_TO_UINT (link->data);
138 if (number == display_number)
140 display_numbers = g_list_delete_link (display_numbers, link);
147 x_server_local_new (void)
150 gchar hostname[1024], *number, *name;
153 self = g_object_new (X_SERVER_LOCAL_TYPE, NULL);
155 x_server_set_display_number (X_SERVER (self), x_server_local_get_unused_display_number ());
157 gethostname (hostname, 1024);
158 number = g_strdup_printf ("%d", x_server_get_display_number (X_SERVER (self)));
159 cookie = x_authority_new_cookie (XAUTH_FAMILY_LOCAL, (guint8*) hostname, strlen (hostname), number);
160 x_server_set_authority (X_SERVER (self), cookie);
162 g_object_unref (cookie);
164 name = g_strdup_printf ("x-%d", x_server_get_display_number (X_SERVER (self)));
165 display_server_set_name (DISPLAY_SERVER (self), name);
172 x_server_local_set_command (XServerLocal *server, const gchar *command)
174 g_return_if_fail (server != NULL);
175 g_free (server->priv->command);
176 server->priv->command = g_strdup (command);
180 x_server_local_set_vt (XServerLocal *server, gint vt)
182 g_return_if_fail (server != NULL);
183 if (server->priv->have_vt_ref)
184 vt_unref (server->priv->vt);
185 server->priv->have_vt_ref = FALSE;
186 server->priv->vt = vt;
190 server->priv->have_vt_ref = TRUE;
195 x_server_local_set_config (XServerLocal *server, const gchar *path)
197 g_return_if_fail (server != NULL);
198 g_free (server->priv->config_file);
199 server->priv->config_file = g_strdup (path);
203 x_server_local_set_layout (XServerLocal *server, const gchar *layout)
205 g_return_if_fail (server != NULL);
206 g_free (server->priv->layout);
207 server->priv->layout = g_strdup (layout);
211 x_server_local_set_xdg_seat (XServerLocal *server, const gchar *xdg_seat)
213 g_return_if_fail (server != NULL);
214 g_free (server->priv->xdg_seat);
215 server->priv->xdg_seat = g_strdup (xdg_seat);
219 x_server_local_set_allow_tcp (XServerLocal *server, gboolean allow_tcp)
221 g_return_if_fail (server != NULL);
222 server->priv->allow_tcp = allow_tcp;
226 x_server_local_set_xdmcp_server (XServerLocal *server, const gchar *hostname)
228 g_return_if_fail (server != NULL);
229 g_free (server->priv->xdmcp_server);
230 server->priv->xdmcp_server = g_strdup (hostname);
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_background (XServerLocal *server, const gchar *background)
266 g_return_if_fail (server != NULL);
267 g_free (server->priv->background);
268 server->priv->background = g_strdup (background);
272 x_server_local_set_mir_id (XServerLocal *server, const gchar *id)
274 g_return_if_fail (server != NULL);
275 g_free (server->priv->mir_id);
276 server->priv->mir_id = g_strdup (id);
279 const gchar *x_server_local_get_mir_id (XServerLocal *server)
281 g_return_val_if_fail (server != NULL, NULL);
282 return server->priv->mir_id;
286 x_server_local_set_mir_socket (XServerLocal *server, const gchar *socket)
288 g_return_if_fail (server != NULL);
289 g_free (server->priv->mir_socket);
290 server->priv->mir_socket = g_strdup (socket);
294 x_server_local_get_vt (DisplayServer *server)
296 g_return_val_if_fail (server != NULL, 0);
297 return X_SERVER_LOCAL (server)->priv->vt;
301 x_server_local_get_authority_file_path (XServerLocal *server)
303 g_return_val_if_fail (server != NULL, 0);
304 return server->priv->authority_file;
308 get_absolute_command (const gchar *command)
311 gchar *absolute_binary, *absolute_command = NULL;
313 tokens = g_strsplit (command, " ", 2);
315 absolute_binary = g_find_program_in_path (tokens[0]);
319 absolute_command = g_strjoin (" ", absolute_binary, tokens[1], NULL);
321 absolute_command = g_strdup (absolute_binary);
323 g_free (absolute_binary);
327 return absolute_command;
331 run_cb (Process *process, gpointer user_data)
335 /* Make input non-blocking */
336 fd = open ("/dev/null", O_RDONLY);
337 dup2 (fd, STDIN_FILENO);
340 /* Set SIGUSR1 to ignore so the X server can indicate it when it is ready */
341 signal (SIGUSR1, SIG_IGN);
345 got_signal_cb (Process *process, int signum, XServerLocal *server)
347 if (signum == SIGUSR1 && !server->priv->got_signal)
349 server->priv->got_signal = TRUE;
350 l_debug (server, "Got signal from X server :%d", x_server_get_display_number (X_SERVER (server)));
352 // FIXME: Check return value
353 DISPLAY_SERVER_CLASS (x_server_local_parent_class)->start (DISPLAY_SERVER (server));
358 stopped_cb (Process *process, XServerLocal *server)
360 l_debug (server, "X server stopped");
362 /* Release VT and display number for re-use */
363 if (server->priv->have_vt_ref)
365 vt_unref (server->priv->vt);
366 server->priv->have_vt_ref = FALSE;
368 x_server_local_release_display_number (x_server_get_display_number (X_SERVER (server)));
370 if (x_server_get_authority (X_SERVER (server)) && server->priv->authority_file)
372 l_debug (server, "Removing X server authority %s", server->priv->authority_file);
374 g_unlink (server->priv->authority_file);
376 g_free (server->priv->authority_file);
377 server->priv->authority_file = NULL;
380 DISPLAY_SERVER_CLASS (x_server_local_parent_class)->stop (DISPLAY_SERVER (server));
384 write_authority_file (XServerLocal *server)
386 XAuthority *authority;
387 GError *error = NULL;
389 authority = x_server_get_authority (X_SERVER (server));
393 /* Get file to write to if have authority */
394 if (!server->priv->authority_file)
396 gchar *run_dir, *dir;
398 run_dir = config_get_string (config_get_instance (), "LightDM", "run-directory");
399 dir = g_build_filename (run_dir, "root", NULL);
401 if (g_mkdir_with_parents (dir, S_IRWXU) < 0)
402 l_warning (server, "Failed to make authority directory %s: %s", dir, strerror (errno));
404 server->priv->authority_file = g_build_filename (dir, x_server_get_address (X_SERVER (server)), NULL);
408 l_debug (server, "Writing X server authority to %s", server->priv->authority_file);
410 x_authority_write (authority, XAUTH_WRITE_MODE_REPLACE, server->priv->authority_file, &error);
412 l_warning (server, "Failed to write authority: %s", error->message);
413 g_clear_error (&error);
417 x_server_local_start (DisplayServer *display_server)
419 XServerLocal *server = X_SERVER_LOCAL (display_server);
421 gchar *filename, *dir, *log_file, *absolute_command;
424 g_return_val_if_fail (server->priv->x_server_process == NULL, FALSE);
426 server->priv->got_signal = FALSE;
428 g_return_val_if_fail (server->priv->command != NULL, FALSE);
430 server->priv->x_server_process = process_new (run_cb, server);
431 process_set_clear_environment (server->priv->x_server_process, TRUE);
432 g_signal_connect (server->priv->x_server_process, PROCESS_SIGNAL_GOT_SIGNAL, G_CALLBACK (got_signal_cb), server);
433 g_signal_connect (server->priv->x_server_process, PROCESS_SIGNAL_STOPPED, G_CALLBACK (stopped_cb), server);
436 filename = g_strdup_printf ("%s.log", display_server_get_name (display_server));
437 dir = config_get_string (config_get_instance (), "LightDM", "log-directory");
438 log_file = g_build_filename (dir, filename, NULL);
439 process_set_log_file (server->priv->x_server_process, log_file, TRUE);
440 l_debug (display_server, "Logging to %s", log_file);
445 absolute_command = get_absolute_command (server->priv->command);
446 if (!absolute_command)
448 l_debug (display_server, "Can't launch X server %s, not found in path", server->priv->command);
449 stopped_cb (server->priv->x_server_process, X_SERVER_LOCAL (server));
452 command = g_string_new (absolute_command);
453 g_free (absolute_command);
455 g_string_append_printf (command, " :%d", x_server_get_display_number (X_SERVER (server)));
457 if (server->priv->config_file)
458 g_string_append_printf (command, " -config %s", server->priv->config_file);
460 if (server->priv->layout)
461 g_string_append_printf (command, " -layout %s", server->priv->layout);
463 if (server->priv->xdg_seat)
464 g_string_append_printf (command, " -seat %s", server->priv->xdg_seat);
466 write_authority_file (server);
467 if (server->priv->authority_file)
468 g_string_append_printf (command, " -auth %s", server->priv->authority_file);
470 /* Setup for running inside Mir */
471 if (server->priv->mir_id)
472 g_string_append_printf (command, " -mir %s", server->priv->mir_id);
474 if (server->priv->mir_socket)
475 g_string_append_printf (command, " -mirSocket %s", server->priv->mir_socket);
477 /* Connect to a remote server using XDMCP */
478 if (server->priv->xdmcp_server != NULL)
480 if (server->priv->xdmcp_port != 0)
481 g_string_append_printf (command, " -port %d", server->priv->xdmcp_port);
482 g_string_append_printf (command, " -query %s", server->priv->xdmcp_server);
483 if (server->priv->xdmcp_key)
484 g_string_append_printf (command, " -cookie %s", server->priv->xdmcp_key);
486 else if (!server->priv->allow_tcp)
487 g_string_append (command, " -nolisten tcp");
489 if (server->priv->vt >= 0)
490 g_string_append_printf (command, " vt%d -novtswitch", server->priv->vt);
492 if (server->priv->background)
493 g_string_append_printf (command, " -background %s", server->priv->background);
495 process_set_command (server->priv->x_server_process, command->str);
496 g_string_free (command, TRUE);
498 l_debug (display_server, "Launching X Server");
500 /* If running inside another display then pass through those variables */
501 if (g_getenv ("DISPLAY"))
503 process_set_env (server->priv->x_server_process, "DISPLAY", g_getenv ("DISPLAY"));
504 if (g_getenv ("XAUTHORITY"))
505 process_set_env (server->priv->x_server_process, "XAUTHORITY", g_getenv ("XAUTHORITY"));
509 path = g_build_filename (g_get_home_dir (), ".Xauthority", NULL);
510 process_set_env (server->priv->x_server_process, "XAUTHORITY", path);
515 /* Variable required for regression tests */
516 if (g_getenv ("LIGHTDM_TEST_ROOT"))
518 process_set_env (server->priv->x_server_process, "LIGHTDM_TEST_ROOT", g_getenv ("LIGHTDM_TEST_ROOT"));
519 process_set_env (server->priv->x_server_process, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
520 process_set_env (server->priv->x_server_process, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
523 result = process_start (server->priv->x_server_process, FALSE);
526 l_debug (display_server, "Waiting for ready signal from X server :%d", x_server_get_display_number (X_SERVER (server)));
529 stopped_cb (server->priv->x_server_process, X_SERVER_LOCAL (server));
535 x_server_local_stop (DisplayServer *server)
537 process_stop (X_SERVER_LOCAL (server)->priv->x_server_process);
541 x_server_local_init (XServerLocal *server)
543 server->priv = G_TYPE_INSTANCE_GET_PRIVATE (server, X_SERVER_LOCAL_TYPE, XServerLocalPrivate);
544 server->priv->vt = -1;
545 server->priv->command = g_strdup ("X");
549 x_server_local_finalize (GObject *object)
553 self = X_SERVER_LOCAL (object);
555 if (self->priv->x_server_process)
557 g_signal_handlers_disconnect_matched (self->priv->x_server_process, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
558 g_object_unref (self->priv->x_server_process);
560 g_free (self->priv->command);
561 g_free (self->priv->config_file);
562 g_free (self->priv->layout);
563 g_free (self->priv->xdg_seat);
564 g_free (self->priv->xdmcp_server);
565 g_free (self->priv->xdmcp_key);
566 g_free (self->priv->mir_id);
567 g_free (self->priv->mir_socket);
568 g_free (self->priv->authority_file);
569 if (self->priv->have_vt_ref)
570 vt_unref (self->priv->vt);
571 g_free (self->priv->background);
573 G_OBJECT_CLASS (x_server_local_parent_class)->finalize (object);
577 x_server_local_class_init (XServerLocalClass *klass)
579 GObjectClass *object_class = G_OBJECT_CLASS (klass);
580 DisplayServerClass *display_server_class = DISPLAY_SERVER_CLASS (klass);
582 display_server_class->get_vt = x_server_local_get_vt;
583 display_server_class->start = x_server_local_start;
584 display_server_class->stop = x_server_local_stop;
585 object_class->finalize = x_server_local_finalize;
587 g_type_class_add_private (klass, sizeof (XServerLocalPrivate));