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_vt (DisplayServer *server)
285 g_return_val_if_fail (server != NULL, 0);
286 return X_SERVER_LOCAL (server)->priv->vt;
290 x_server_local_get_authority_file_path (XServerLocal *server)
292 g_return_val_if_fail (server != NULL, 0);
293 return server->priv->authority_file;
297 get_absolute_command (const gchar *command)
300 gchar *absolute_binary, *absolute_command = NULL;
302 tokens = g_strsplit (command, " ", 2);
304 absolute_binary = g_find_program_in_path (tokens[0]);
308 absolute_command = g_strjoin (" ", absolute_binary, tokens[1], NULL);
310 absolute_command = g_strdup (absolute_binary);
312 g_free (absolute_binary);
316 return absolute_command;
320 run_cb (Process *process, XServerLocal *server)
324 /* Make input non-blocking */
325 fd = open ("/dev/null", O_RDONLY);
326 dup2 (fd, STDIN_FILENO);
329 /* Redirect output to logfile */
330 if (server->priv->log_file)
334 fd = g_open (server->priv->log_file, O_WRONLY | O_CREAT | O_TRUNC, 0600);
336 l_warning (server, "Failed to open log file %s: %s", server->priv->log_file, g_strerror (errno));
339 dup2 (fd, STDOUT_FILENO);
340 dup2 (fd, STDERR_FILENO);
345 /* Set SIGUSR1 to ignore so the X server can indicate it when it is ready */
346 signal (SIGUSR1, SIG_IGN);
350 got_signal_cb (Process *process, int signum, XServerLocal *server)
352 if (signum == SIGUSR1 && !server->priv->got_signal)
354 server->priv->got_signal = TRUE;
355 l_debug (server, "Got signal from X server :%d", x_server_get_display_number (X_SERVER (server)));
357 // FIXME: Check return value
358 DISPLAY_SERVER_CLASS (x_server_local_parent_class)->start (DISPLAY_SERVER (server));
363 stopped_cb (Process *process, XServerLocal *server)
365 l_debug (server, "X server stopped");
367 /* Release VT and display number for re-use */
368 if (server->priv->have_vt_ref)
370 vt_unref (server->priv->vt);
371 server->priv->have_vt_ref = FALSE;
373 x_server_local_release_display_number (x_server_get_display_number (X_SERVER (server)));
375 if (x_server_get_authority (X_SERVER (server)) && server->priv->authority_file)
377 l_debug (server, "Removing X server authority %s", server->priv->authority_file);
379 g_unlink (server->priv->authority_file);
381 g_free (server->priv->authority_file);
382 server->priv->authority_file = NULL;
385 DISPLAY_SERVER_CLASS (x_server_local_parent_class)->stop (DISPLAY_SERVER (server));
389 write_authority_file (XServerLocal *server)
391 XAuthority *authority;
392 GError *error = NULL;
394 authority = x_server_get_authority (X_SERVER (server));
398 /* Get file to write to if have authority */
399 if (!server->priv->authority_file)
401 gchar *run_dir, *dir;
403 run_dir = config_get_string (config_get_instance (), "LightDM", "run-directory");
404 dir = g_build_filename (run_dir, "root", NULL);
406 if (g_mkdir_with_parents (dir, S_IRWXU) < 0)
407 l_warning (server, "Failed to make authority directory %s: %s", dir, strerror (errno));
409 server->priv->authority_file = g_build_filename (dir, x_server_get_address (X_SERVER (server)), NULL);
413 l_debug (server, "Writing X server authority to %s", server->priv->authority_file);
415 x_authority_write (authority, XAUTH_WRITE_MODE_REPLACE, server->priv->authority_file, &error);
417 l_warning (server, "Failed to write authority: %s", error->message);
418 g_clear_error (&error);
422 x_server_local_start (DisplayServer *display_server)
424 XServerLocal *server = X_SERVER_LOCAL (display_server);
426 gchar *filename, *dir, *absolute_command;
429 g_return_val_if_fail (server->priv->x_server_process == NULL, FALSE);
431 server->priv->got_signal = FALSE;
433 g_return_val_if_fail (server->priv->command != NULL, FALSE);
435 server->priv->x_server_process = process_new ();
436 process_set_clear_environment (server->priv->x_server_process, TRUE);
437 g_signal_connect (server->priv->x_server_process, "run", G_CALLBACK (run_cb), server);
438 g_signal_connect (server->priv->x_server_process, "got-signal", G_CALLBACK (got_signal_cb), server);
439 g_signal_connect (server->priv->x_server_process, "stopped", G_CALLBACK (stopped_cb), server);
442 filename = g_strdup_printf ("%s.log", display_server_get_name (display_server));
443 dir = config_get_string (config_get_instance (), "LightDM", "log-directory");
444 server->priv->log_file = g_build_filename (dir, filename, NULL);
445 l_debug (display_server, "Logging to %s", server->priv->log_file);
449 absolute_command = get_absolute_command (server->priv->command);
450 if (!absolute_command)
452 l_debug (display_server, "Can't launch X server %s, not found in path", server->priv->command);
453 stopped_cb (server->priv->x_server_process, X_SERVER_LOCAL (server));
456 command = g_string_new (absolute_command);
457 g_free (absolute_command);
459 g_string_append_printf (command, " :%d", x_server_get_display_number (X_SERVER (server)));
461 if (server->priv->config_file)
462 g_string_append_printf (command, " -config %s", server->priv->config_file);
464 if (server->priv->layout)
465 g_string_append_printf (command, " -layout %s", server->priv->layout);
467 write_authority_file (server);
468 if (server->priv->authority_file)
469 g_string_append_printf (command, " -auth %s", server->priv->authority_file);
471 /* Setup for running inside Mir */
472 if (server->priv->mir_id)
473 g_string_append_printf (command, " -mir %s", server->priv->mir_id);
475 if (server->priv->mir_socket)
476 g_string_append_printf (command, " -mirSocket %s", server->priv->mir_socket);
478 /* Connect to a remote server using XDMCP */
479 if (server->priv->xdmcp_server != NULL)
481 if (server->priv->xdmcp_port != 0)
482 g_string_append_printf (command, " -port %d", server->priv->xdmcp_port);
483 g_string_append_printf (command, " -query %s", server->priv->xdmcp_server);
484 if (server->priv->xdmcp_key)
485 g_string_append_printf (command, " -cookie %s", server->priv->xdmcp_key);
487 else if (!server->priv->allow_tcp)
488 g_string_append (command, " -nolisten tcp");
490 if (server->priv->vt >= 0)
491 g_string_append_printf (command, " vt%d -novtswitch", server->priv->vt);
493 if (server->priv->background)
494 g_string_append_printf (command, " -background %s", server->priv->background);
496 process_set_command (server->priv->x_server_process, command->str);
497 g_string_free (command, TRUE);
499 l_debug (display_server, "Launching X Server");
501 /* If running inside another display then pass through those variables */
502 if (g_getenv ("DISPLAY"))
504 process_set_env (server->priv->x_server_process, "DISPLAY", g_getenv ("DISPLAY"));
505 if (g_getenv ("XAUTHORITY"))
506 process_set_env (server->priv->x_server_process, "XAUTHORITY", g_getenv ("XAUTHORITY"));
510 path = g_build_filename (g_get_home_dir (), ".Xauthority", NULL);
511 process_set_env (server->priv->x_server_process, "XAUTHORITY", path);
516 /* Variable required for regression tests */
517 if (g_getenv ("LIGHTDM_TEST_ROOT"))
519 process_set_env (server->priv->x_server_process, "LIGHTDM_TEST_ROOT", g_getenv ("LIGHTDM_TEST_ROOT"));
520 process_set_env (server->priv->x_server_process, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
521 process_set_env (server->priv->x_server_process, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
524 result = process_start (server->priv->x_server_process, FALSE);
527 l_debug (display_server, "Waiting for ready signal from X server :%d", x_server_get_display_number (X_SERVER (server)));
530 stopped_cb (server->priv->x_server_process, X_SERVER_LOCAL (server));
536 x_server_local_stop (DisplayServer *server)
538 process_stop (X_SERVER_LOCAL (server)->priv->x_server_process);
542 x_server_local_init (XServerLocal *server)
544 server->priv = G_TYPE_INSTANCE_GET_PRIVATE (server, X_SERVER_LOCAL_TYPE, XServerLocalPrivate);
545 server->priv->vt = -1;
546 server->priv->command = g_strdup ("X");
550 x_server_local_finalize (GObject *object)
554 self = X_SERVER_LOCAL (object);
556 if (self->priv->x_server_process)
558 g_signal_handlers_disconnect_matched (self->priv->x_server_process, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
559 g_object_unref (self->priv->x_server_process);
561 g_free (self->priv->log_file);
562 g_free (self->priv->command);
563 g_free (self->priv->config_file);
564 g_free (self->priv->layout);
565 g_free (self->priv->xdmcp_server);
566 g_free (self->priv->xdmcp_key);
567 g_free (self->priv->mir_id);
568 g_free (self->priv->mir_socket);
569 g_free (self->priv->authority_file);
570 if (self->priv->vt > 0)
571 vt_unref (self->priv->vt);
572 g_free (self->priv->background);
574 G_OBJECT_CLASS (x_server_local_parent_class)->finalize (object);
578 x_server_local_class_init (XServerLocalClass *klass)
580 GObjectClass *object_class = G_OBJECT_CLASS (klass);
581 DisplayServerClass *display_server_class = DISPLAY_SERVER_CLASS (klass);
583 display_server_class->get_vt = x_server_local_get_vt;
584 display_server_class->start = x_server_local_start;
585 display_server_class->stop = x_server_local_stop;
586 object_class->finalize = x_server_local_finalize;
588 g_type_class_add_private (klass, sizeof (XServerLocalPrivate));