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 should share VT with other X server */
46 /* TRUE if TCP/IP connections are allowed */
50 gchar *authority_file;
52 /* XDMCP server to connect to */
55 /* XDMCP port to connect to */
58 /* XDMCP key to use */
61 /* ID to report to Mir */
64 /* Filename of socket Mir is listening on */
67 /* TRUE when received ready signal */
74 /* Background to set */
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 in_use = 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 (in_use && g_file_get_contents (path, &data, NULL, NULL))
107 pid = atoi (g_strstrip (data));
111 if (pid < 0 || (kill (pid, 0) < 0 && errno == ESRCH))
121 x_server_local_get_unused_display_number (void)
125 number = config_get_integer (config_get_instance (), "LightDM", "minimum-display-number");
126 while (display_number_in_use (number))
129 display_numbers = g_list_append (display_numbers, GUINT_TO_POINTER (number));
135 x_server_local_release_display_number (guint display_number)
138 for (link = display_numbers; link; link = link->next)
140 guint number = GPOINTER_TO_UINT (link->data);
141 if (number == display_number)
143 display_numbers = g_list_delete_link (display_numbers, link);
150 x_server_local_new (void)
153 gchar hostname[1024], *number, *name;
156 self = g_object_new (X_SERVER_LOCAL_TYPE, NULL);
158 x_server_set_display_number (X_SERVER (self), x_server_local_get_unused_display_number ());
160 gethostname (hostname, 1024);
161 number = g_strdup_printf ("%d", x_server_get_display_number (X_SERVER (self)));
162 cookie = x_authority_new_cookie (XAUTH_FAMILY_LOCAL, (guint8*) hostname, strlen (hostname), number);
163 x_server_set_authority (X_SERVER (self), cookie);
165 g_object_unref (cookie);
167 name = g_strdup_printf ("x-%d", x_server_get_display_number (X_SERVER (self)));
168 display_server_set_name (DISPLAY_SERVER (self), name);
175 x_server_local_set_command (XServerLocal *server, const gchar *command)
177 g_return_if_fail (server != NULL);
178 g_free (server->priv->command);
179 server->priv->command = g_strdup (command);
183 x_server_local_set_vt (XServerLocal *server, gint vt)
185 g_return_if_fail (server != NULL);
186 if (server->priv->have_vt_ref)
187 vt_unref (server->priv->vt);
188 server->priv->have_vt_ref = FALSE;
189 server->priv->vt = vt;
193 server->priv->have_vt_ref = TRUE;
198 x_server_local_set_config (XServerLocal *server, const gchar *path)
200 g_return_if_fail (server != NULL);
201 g_free (server->priv->config_file);
202 server->priv->config_file = g_strdup (path);
206 x_server_local_set_layout (XServerLocal *server, const gchar *layout)
208 g_return_if_fail (server != NULL);
209 g_free (server->priv->layout);
210 server->priv->layout = g_strdup (layout);
214 x_server_local_set_xdg_seat (XServerLocal *server, const gchar *xdg_seat)
216 g_return_if_fail (server != NULL);
217 g_free (server->priv->xdg_seat);
218 server->priv->xdg_seat = g_strdup (xdg_seat);
222 x_server_local_set_sharevts (XServerLocal *server, gboolean sharevts)
224 g_return_if_fail (server != NULL);
225 server->priv->sharevts = sharevts;
229 x_server_local_set_allow_tcp (XServerLocal *server, gboolean allow_tcp)
231 g_return_if_fail (server != NULL);
232 server->priv->allow_tcp = allow_tcp;
236 x_server_local_set_xdmcp_server (XServerLocal *server, const gchar *hostname)
238 g_return_if_fail (server != NULL);
239 g_free (server->priv->xdmcp_server);
240 server->priv->xdmcp_server = g_strdup (hostname);
244 x_server_local_get_xdmcp_server (XServerLocal *server)
246 g_return_val_if_fail (server != NULL, 0);
247 return server->priv->xdmcp_server;
251 x_server_local_set_xdmcp_port (XServerLocal *server, guint port)
253 g_return_if_fail (server != NULL);
254 server->priv->xdmcp_port = port;
258 x_server_local_get_xdmcp_port (XServerLocal *server)
260 g_return_val_if_fail (server != NULL, 0);
261 return server->priv->xdmcp_port;
265 x_server_local_set_xdmcp_key (XServerLocal *server, const gchar *key)
267 g_return_if_fail (server != NULL);
268 g_free (server->priv->xdmcp_key);
269 server->priv->xdmcp_key = g_strdup (key);
270 x_server_set_authority (X_SERVER (server), NULL);
274 x_server_local_set_background (XServerLocal *server, const gchar *background)
276 g_return_if_fail (server != NULL);
277 g_free (server->priv->background);
278 server->priv->background = g_strdup (background);
282 x_server_local_set_mir_id (XServerLocal *server, const gchar *id)
284 g_return_if_fail (server != NULL);
285 g_free (server->priv->mir_id);
286 server->priv->mir_id = g_strdup (id);
289 const gchar *x_server_local_get_mir_id (XServerLocal *server)
291 g_return_val_if_fail (server != NULL, NULL);
292 return server->priv->mir_id;
296 x_server_local_set_mir_socket (XServerLocal *server, const gchar *socket)
298 g_return_if_fail (server != NULL);
299 g_free (server->priv->mir_socket);
300 server->priv->mir_socket = g_strdup (socket);
304 x_server_local_get_vt (DisplayServer *server)
306 g_return_val_if_fail (server != NULL, 0);
307 return X_SERVER_LOCAL (server)->priv->vt;
311 x_server_local_get_authority_file_path (XServerLocal *server)
313 g_return_val_if_fail (server != NULL, 0);
314 return server->priv->authority_file;
318 get_absolute_command (const gchar *command)
321 gchar *absolute_binary, *absolute_command = NULL;
323 tokens = g_strsplit (command, " ", 2);
325 absolute_binary = g_find_program_in_path (tokens[0]);
329 absolute_command = g_strjoin (" ", absolute_binary, tokens[1], NULL);
331 absolute_command = g_strdup (absolute_binary);
333 g_free (absolute_binary);
337 return absolute_command;
341 run_cb (Process *process, gpointer user_data)
345 /* Make input non-blocking */
346 fd = open ("/dev/null", O_RDONLY);
347 dup2 (fd, STDIN_FILENO);
350 /* Set SIGUSR1 to ignore so the X server can indicate it when it is ready */
351 signal (SIGUSR1, SIG_IGN);
355 got_signal_cb (Process *process, int signum, XServerLocal *server)
357 if (signum == SIGUSR1 && !server->priv->got_signal)
359 server->priv->got_signal = TRUE;
360 l_debug (server, "Got signal from X server :%d", x_server_get_display_number (X_SERVER (server)));
362 // FIXME: Check return value
363 DISPLAY_SERVER_CLASS (x_server_local_parent_class)->start (DISPLAY_SERVER (server));
368 stopped_cb (Process *process, XServerLocal *server)
370 l_debug (server, "X server stopped");
372 /* Release VT and display number for re-use */
373 if (server->priv->have_vt_ref)
375 vt_unref (server->priv->vt);
376 server->priv->have_vt_ref = FALSE;
378 x_server_local_release_display_number (x_server_get_display_number (X_SERVER (server)));
380 if (x_server_get_authority (X_SERVER (server)) && server->priv->authority_file)
382 l_debug (server, "Removing X server authority %s", server->priv->authority_file);
384 g_unlink (server->priv->authority_file);
386 g_free (server->priv->authority_file);
387 server->priv->authority_file = NULL;
390 DISPLAY_SERVER_CLASS (x_server_local_parent_class)->stop (DISPLAY_SERVER (server));
394 write_authority_file (XServerLocal *server)
396 XAuthority *authority;
397 GError *error = NULL;
399 authority = x_server_get_authority (X_SERVER (server));
403 /* Get file to write to if have authority */
404 if (!server->priv->authority_file)
406 gchar *run_dir, *dir;
408 run_dir = config_get_string (config_get_instance (), "LightDM", "run-directory");
409 dir = g_build_filename (run_dir, "root", NULL);
411 if (g_mkdir_with_parents (dir, S_IRWXU) < 0)
412 l_warning (server, "Failed to make authority directory %s: %s", dir, strerror (errno));
414 server->priv->authority_file = g_build_filename (dir, x_server_get_address (X_SERVER (server)), NULL);
418 l_debug (server, "Writing X server authority to %s", server->priv->authority_file);
420 x_authority_write (authority, XAUTH_WRITE_MODE_REPLACE, server->priv->authority_file, &error);
422 l_warning (server, "Failed to write authority: %s", error->message);
423 g_clear_error (&error);
427 x_server_local_start (DisplayServer *display_server)
429 XServerLocal *server = X_SERVER_LOCAL (display_server);
431 gchar *filename, *dir, *log_file, *absolute_command;
434 g_return_val_if_fail (server->priv->x_server_process == NULL, FALSE);
436 server->priv->got_signal = FALSE;
438 g_return_val_if_fail (server->priv->command != NULL, FALSE);
440 server->priv->x_server_process = process_new (run_cb, server);
441 process_set_clear_environment (server->priv->x_server_process, TRUE);
442 g_signal_connect (server->priv->x_server_process, PROCESS_SIGNAL_GOT_SIGNAL, G_CALLBACK (got_signal_cb), server);
443 g_signal_connect (server->priv->x_server_process, PROCESS_SIGNAL_STOPPED, G_CALLBACK (stopped_cb), server);
446 filename = g_strdup_printf ("%s.log", display_server_get_name (display_server));
447 dir = config_get_string (config_get_instance (), "LightDM", "log-directory");
448 log_file = g_build_filename (dir, filename, NULL);
449 process_set_log_file (server->priv->x_server_process, log_file, TRUE);
450 l_debug (display_server, "Logging to %s", log_file);
455 absolute_command = get_absolute_command (server->priv->command);
456 if (!absolute_command)
458 l_debug (display_server, "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 if (server->priv->xdg_seat)
474 g_string_append_printf (command, " -seat %s", server->priv->xdg_seat);
476 if (server->priv->sharevts)
477 g_string_append (command, " -sharevts");
479 write_authority_file (server);
480 if (server->priv->authority_file)
481 g_string_append_printf (command, " -auth %s", server->priv->authority_file);
483 /* Setup for running inside Mir */
484 if (server->priv->mir_id)
485 g_string_append_printf (command, " -mir %s", server->priv->mir_id);
487 if (server->priv->mir_socket)
488 g_string_append_printf (command, " -mirSocket %s", server->priv->mir_socket);
490 /* Connect to a remote server using XDMCP */
491 if (server->priv->xdmcp_server != NULL)
493 if (server->priv->xdmcp_port != 0)
494 g_string_append_printf (command, " -port %d", server->priv->xdmcp_port);
495 g_string_append_printf (command, " -query %s", server->priv->xdmcp_server);
496 if (server->priv->xdmcp_key)
497 g_string_append_printf (command, " -cookie %s", server->priv->xdmcp_key);
499 else if (!server->priv->allow_tcp)
500 g_string_append (command, " -nolisten tcp");
502 if (server->priv->vt >= 0)
503 g_string_append_printf (command, " vt%d -novtswitch", server->priv->vt);
505 if (server->priv->background)
506 g_string_append_printf (command, " -background %s", server->priv->background);
508 process_set_command (server->priv->x_server_process, command->str);
509 g_string_free (command, TRUE);
511 l_debug (display_server, "Launching X Server");
513 /* If running inside another display then pass through those variables */
514 if (g_getenv ("DISPLAY"))
516 process_set_env (server->priv->x_server_process, "DISPLAY", g_getenv ("DISPLAY"));
517 if (g_getenv ("XAUTHORITY"))
518 process_set_env (server->priv->x_server_process, "XAUTHORITY", g_getenv ("XAUTHORITY"));
522 path = g_build_filename (g_get_home_dir (), ".Xauthority", NULL);
523 process_set_env (server->priv->x_server_process, "XAUTHORITY", path);
528 /* Variable required for regression tests */
529 if (g_getenv ("LIGHTDM_TEST_ROOT"))
531 process_set_env (server->priv->x_server_process, "LIGHTDM_TEST_ROOT", g_getenv ("LIGHTDM_TEST_ROOT"));
532 process_set_env (server->priv->x_server_process, "LD_PRELOAD", g_getenv ("LD_PRELOAD"));
533 process_set_env (server->priv->x_server_process, "LD_LIBRARY_PATH", g_getenv ("LD_LIBRARY_PATH"));
536 result = process_start (server->priv->x_server_process, FALSE);
539 l_debug (display_server, "Waiting for ready signal from X server :%d", x_server_get_display_number (X_SERVER (server)));
542 stopped_cb (server->priv->x_server_process, X_SERVER_LOCAL (server));
548 x_server_local_stop (DisplayServer *server)
550 process_stop (X_SERVER_LOCAL (server)->priv->x_server_process);
554 x_server_local_init (XServerLocal *server)
556 server->priv = G_TYPE_INSTANCE_GET_PRIVATE (server, X_SERVER_LOCAL_TYPE, XServerLocalPrivate);
557 server->priv->vt = -1;
558 server->priv->command = g_strdup ("X");
562 x_server_local_finalize (GObject *object)
566 self = X_SERVER_LOCAL (object);
568 if (self->priv->x_server_process)
570 g_signal_handlers_disconnect_matched (self->priv->x_server_process, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
571 g_object_unref (self->priv->x_server_process);
573 g_free (self->priv->command);
574 g_free (self->priv->config_file);
575 g_free (self->priv->layout);
576 g_free (self->priv->xdg_seat);
577 g_free (self->priv->xdmcp_server);
578 g_free (self->priv->xdmcp_key);
579 g_free (self->priv->mir_id);
580 g_free (self->priv->mir_socket);
581 g_free (self->priv->authority_file);
582 if (self->priv->have_vt_ref)
583 vt_unref (self->priv->vt);
584 g_free (self->priv->background);
586 G_OBJECT_CLASS (x_server_local_parent_class)->finalize (object);
590 x_server_local_class_init (XServerLocalClass *klass)
592 GObjectClass *object_class = G_OBJECT_CLASS (klass);
593 DisplayServerClass *display_server_class = DISPLAY_SERVER_CLASS (klass);
595 display_server_class->get_vt = x_server_local_get_vt;
596 display_server_class->start = x_server_local_start;
597 display_server_class->stop = x_server_local_stop;
598 object_class->finalize = x_server_local_finalize;
600 g_type_class_add_private (klass, sizeof (XServerLocalPrivate));