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-rw-r--r--tools/dbus-launch-x11.c392
1 files changed, 392 insertions, 0 deletions
diff --git a/tools/dbus-launch-x11.c b/tools/dbus-launch-x11.c
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+/* -*- mode: C; c-file-style: "gnu" -*- */
+/* dbus-launch.h dbus-launch utility
+ *
+ * Copyright (C) 2006 Thiago Macieira <thiago@kde.org>
+ *
+ * Licensed under the Academic Free License version 2.1
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include "dbus-launch.h"
+
+#ifdef DBUS_BUILD_X11
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <pwd.h>
+#include <X11/Xlib.h>
+#include <X11/Xatom.h>
+
+Display *xdisplay;
+static Atom selection_atom;
+static Atom address_atom;
+static Atom pid_atom;
+
+static int
+x_io_error_handler (Display *xdisplay)
+{
+ verbose ("X IO error\n");
+ kill_bus_and_exit (0);
+ return 0;
+}
+
+static char *
+get_local_hostname (void)
+{
+ static const int increment = 128;
+ static char *cache = NULL;
+ char *buffer = NULL;
+ int size = 0;
+
+ while (cache == NULL)
+ {
+ size += increment;
+ buffer = realloc (buffer, size);
+ if (buffer == NULL)
+ return NULL; /* out of memory */
+
+ if (gethostname (buffer, size - 1) == -1 &&
+ errno != ENAMETOOLONG)
+ return NULL;
+
+ buffer[size - 1] = '\0'; /* to make sure */
+ cache = buffer;
+ }
+
+ return cache;
+}
+
+static char *
+get_session_file (void)
+{
+ static const char prefix[] = "/.dbus-session-file_";
+ char *hostname;
+ char *display;
+ char *home;
+ char *result;
+ char *p;
+
+ display = xstrdup (getenv ("DISPLAY"));
+ if (display == NULL)
+ {
+ verbose ("X11 integration disabled because X11 is not running\n");
+ return NULL;
+ }
+
+ /* remove the screen part of the display name */
+ p = strrchr (display, ':');
+ if (p != NULL)
+ for ( ; *p; ++p)
+ if (*p == '.')
+ {
+ *p = '\0';
+ break;
+ }
+
+ /* replace the : in the display with _ */
+ for (p = display; *p; ++p)
+ if (*p == ':')
+ *p = '_';
+
+ hostname = get_local_hostname ();
+ if (hostname == NULL)
+ {
+ /* out of memory */
+ free (display);
+ return NULL;
+ }
+
+ home = getenv ("HOME");
+ if (home == NULL)
+ {
+ /* try from the user database */
+ struct passwd *user = getpwuid (getuid());
+ if (user == NULL)
+ {
+ verbose ("X11 integration disabled because the home directory"
+ " could not be determined\n");
+ free (display);
+ return NULL;
+ }
+
+ home = user->pw_dir;
+ }
+
+ result = malloc (strlen (home) + strlen (prefix) + strlen (hostname) +
+ strlen (display) + 2);
+ if (result == NULL)
+ {
+ /* out of memory */
+ free (display);
+ return NULL;
+ }
+
+ strcpy (result, home);
+ strcat (result, prefix);
+ strcat (result, hostname);
+ strcat (result, "_");
+ strcat (result, display);
+ free (display);
+
+ verbose ("session file: %s\n", result);
+ return result;
+}
+
+static Display *
+open_x11 (void)
+{
+ if (xdisplay != NULL)
+ return xdisplay;
+
+ xdisplay = XOpenDisplay (NULL);
+ if (xdisplay != NULL)
+ {
+ verbose ("Connected to X11 display '%s'\n", DisplayString (xdisplay));
+ XSetIOErrorHandler (x_io_error_handler);
+ }
+ return xdisplay;
+}
+
+static int
+init_x_atoms (Display *display)
+{
+ static const char selection_prefix[] = "DBUS_SESSION_SELECTION_";
+ static const char address_prefix[] = "DBUS_SESSION_ADDRESS";
+ static const char pid_prefix[] = "DBUS_SESSION_PID";
+ static int init = FALSE;
+ char *atom_name;
+ char *hostname;
+ char *user_name;
+ struct passwd *user;
+
+ if (init)
+ return TRUE;
+
+ user = getpwuid (getuid ());
+ if (user == NULL)
+ {
+ verbose ("Could not determine the user informations; aborting X11 integration.\n");
+ return FALSE;
+ }
+ user_name = xstrdup(user->pw_name);
+
+ hostname = get_local_hostname ();
+ if (hostname == NULL)
+ {
+ verbose ("Could not create X11 atoms; aborting X11 integration.\n");
+ free (user_name);
+ return FALSE;
+ }
+
+ atom_name = malloc (strlen (hostname) + strlen (user_name) + 2 +
+ MAX (strlen (selection_prefix),
+ MAX (strlen (address_prefix),
+ strlen (pid_prefix))));
+ if (atom_name == NULL)
+ {
+ verbose ("Could not create X11 atoms; aborting X11 integration.\n");
+ free (user_name);
+ return FALSE;
+ }
+
+ /* create the selection atom */
+ strcpy (atom_name, selection_prefix);
+ strcat (atom_name, user_name);
+ strcat (atom_name, "_");
+ strcat (atom_name, hostname);
+ selection_atom = XInternAtom (display, atom_name, FALSE);
+
+ /* create the address property atom */
+ strcpy (atom_name, address_prefix);
+ address_atom = XInternAtom (display, atom_name, FALSE);
+
+ /* create the PID property atom */
+ strcpy (atom_name, pid_prefix);
+ pid_atom = XInternAtom (display, atom_name, FALSE);
+
+ free (atom_name);
+ free (user_name);
+ init = TRUE;
+ return TRUE;
+}
+
+/*
+ * Gets the daemon address from the X11 display.
+ * Returns FALSE if there was an error. Returning
+ * TRUE does not mean the address exists.
+ */
+int
+x11_get_address (char **paddress, pid_t *pid, long *wid)
+{
+ Atom type;
+ Window owner;
+ int format;
+ unsigned long items;
+ unsigned long after;
+ char *data;
+
+ *paddress = NULL;
+
+ /* locate the selection owner */
+ owner = XGetSelectionOwner (xdisplay, selection_atom);
+ if (owner == None)
+ return TRUE; /* no owner */
+ if (wid != NULL)
+ *wid = (long) owner;
+
+ /* get the bus address */
+ XGetWindowProperty (xdisplay, owner, address_atom, 0, 1024, False,
+ XA_STRING, &type, &format, &items, &after,
+ (unsigned char **) &data);
+ if (type == None || after != 0 || data == NULL || format != 8)
+ return FALSE; /* error */
+
+ *paddress = xstrdup (data);
+ XFree (data);
+
+ /* get the PID */
+ if (pid != NULL)
+ {
+ *pid = 0;
+ XGetWindowProperty (xdisplay, owner, pid_atom, 0, sizeof pid, False,
+ XA_CARDINAL, &type, &format, &items, &after,
+ (unsigned char **) &data);
+ if (type != None && after == 0 && data != NULL && format == 32)
+ *pid = (pid_t) *(long*) data;
+ XFree (data);
+ }
+
+ return TRUE; /* success */
+}
+
+/*
+ * Saves the address in the X11 display. Returns 0 on success.
+ * If an error occurs, returns -1. If the selection already exists,
+ * returns 1. (i.e. another daemon is already running)
+ */
+static Window
+set_address_in_x11(char *address, pid_t pid)
+{
+ char *current_address;
+ Window wid;
+
+ /* lock the X11 display to make sure we're doing this atomically */
+ XGrabServer (xdisplay);
+
+ if (!x11_get_address (&current_address, NULL, NULL))
+ {
+ /* error! */
+ XUngrabServer (xdisplay);
+ return None;
+ }
+
+ if (current_address != NULL)
+ {
+ /* someone saved the address in the meantime */
+ XUngrabServer (xdisplay);
+ free (current_address);
+ return None;
+ }
+
+ /* Create our window */
+ wid = XCreateSimpleWindow (xdisplay, RootWindow (xdisplay, 0), -20, -20, 10, 10,
+ 0, WhitePixel (xdisplay, 0),
+ BlackPixel (xdisplay, 0));
+ verbose ("Created window %d\n", wid);
+
+ /* Save the property in the window */
+ XChangeProperty (xdisplay, wid, address_atom, XA_STRING, 8, PropModeReplace,
+ (unsigned char *)address, strlen (address));
+ XChangeProperty (xdisplay, wid, pid_atom, XA_CARDINAL, 32, PropModeReplace,
+ (unsigned char *)&pid, sizeof(pid) / 4);
+
+ /* Now grab the selection */
+ XSetSelectionOwner (xdisplay, selection_atom, wid, CurrentTime);
+
+ /* Ungrab the server to let other people use it too */
+ XUngrabServer (xdisplay);
+
+ XFlush (xdisplay);
+
+ return wid;
+}
+
+/*
+ * Saves the session address in session file. Returns TRUE on
+ * success, FALSE if an error occurs.
+ */
+static int
+set_address_in_file (char *address, pid_t pid, Window wid)
+{
+ char *session_file;
+ FILE *f;
+
+ session_file = get_session_file();
+ if (session_file == NULL)
+ return FALSE;
+
+ f = fopen (session_file, "w");
+ if (f == NULL)
+ return FALSE; /* some kind of error */
+ fprintf (f, "%s\n%ld\n%ld\n", address, (long)pid, (long)wid);
+
+ fclose (f);
+ free (session_file);
+
+ return TRUE;
+}
+
+int
+x11_save_address (char *address, pid_t pid, long *wid)
+{
+ Window id = set_address_in_x11 (address, pid);
+ if (id != None)
+ {
+ if (!set_address_in_file (address, pid, id))
+ return FALSE;
+
+ if (wid != NULL)
+ *wid = (long) id;
+ return TRUE;
+ }
+ return FALSE;
+}
+
+int
+x11_init (void)
+{
+ return open_x11 () != NULL && init_x_atoms (xdisplay);
+}
+
+void
+x11_handle_event (void)
+{
+ if (xdisplay != NULL)
+ {
+ while (XPending (xdisplay))
+ {
+ XEvent ignored;
+ XNextEvent (xdisplay, &ignored);
+ }
+ }
+}
+
+#else
+void dummy_dbus_launch_x11 (void) { }
+#endif
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