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launcher: Replace mutter-launch with logind integration

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This uses David Herrmann's new logind sessions interface to retrieve
fds for input devices, rather than using a custom setuid helper to do
the management. This vastly simplifies the interface.

This requires systemd v210, at least.

https://bugzilla.gnome.org/show_bug.cgi?id=724604
This commit is contained in:
Jasper St. Pierre 2013-12-31 17:44:45 -05:00
parent f93fc1506b
commit dcf64ca167
10 changed files with 410 additions and 1025 deletions
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2
.gitignore vendored
View File

@ -48,7 +48,6 @@ po/*.pot
50-metacity-key.xml
libmutter.pc
mutter
mutter-launch
org.gnome.mutter.gschema.valid
org.gnome.mutter.gschema.xml
org.gnome.mutter.wayland.gschema.valid
@ -78,6 +77,7 @@ src/mutter-marshal.[ch]
src/stamp-mutter-marshal.h
src/meta-dbus-display-config.[ch]
src/meta-dbus-idle-monitor.[ch]
src/meta-dbus-login1.[ch]
src/gtk-shell-protocol.c
src/gtk-shell-server-protocol.h
src/xdg-shell-protocol.c

3
configure.ac
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@ -127,7 +127,6 @@ AM_GLIB_GNU_GETTEXT
## here we get the flags we'll actually use
# GRegex requires Glib-2.14.0
PKG_CHECK_MODULES(ALL, glib-2.0 >= 2.14.0)
PKG_CHECK_MODULES(MUTTER_LAUNCH, libdrm libsystemd-login)
# Unconditionally use this dir to avoid a circular dep with gnomecc
GNOME_KEYBINDINGS_KEYSDIR="${datadir}/gnome-control-center/keybindings"
@ -200,7 +199,7 @@ AS_IF([test "x$WAYLAND_SCANNER" = "xno"],
AC_SUBST([WAYLAND_SCANNER])
AC_SUBST(XWAYLAND_PATH)
MUTTER_PC_MODULES="$MUTTER_PC_MODULES clutter-wayland-1.0 clutter-wayland-compositor-1.0 clutter-egl-1.0 wayland-server >= 1.4.93 libdrm"
MUTTER_PC_MODULES="$MUTTER_PC_MODULES clutter-wayland-1.0 clutter-wayland-compositor-1.0 clutter-egl-1.0 wayland-server >= 1.4.93 libdrm libsystemd"
PKG_CHECK_MODULES(MUTTER, $MUTTER_PC_MODULES)
PKG_CHECK_EXISTS([xi >= 1.6.99.1],

25
src/Makefile.am
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@ -35,6 +35,7 @@ INCLUDES= \
mutter_built_sources = \
$(dbus_idle_built_sources) \
$(dbus_display_config_built_sources) \
$(dbus_login1_built_sources) \
mutter-enum-types.h \
mutter-enum-types.c \
gtk-shell-protocol.c \
@ -80,6 +81,8 @@ libmutter_la_SOURCES = \
backends/native/meta-monitor-manager-kms.h \
backends/native/meta-launcher.c \
backends/native/meta-launcher.h \
backends/native/dbus-utils.c \
backends/native/dbus-utils.h \
backends/x11/meta-backend-x11.c \
backends/x11/meta-backend-x11.h \
backends/x11/meta-cursor-renderer-x11.c \
@ -293,19 +296,6 @@ bin_PROGRAMS=mutter
mutter_SOURCES = core/mutter.c
mutter_LDADD = $(MUTTER_LIBS) libmutter.la
bin_PROGRAMS+=mutter-launch
mutter_launch_SOURCES = \
backends/native/weston-launch.c \
backends/native/weston-launch.h
mutter_launch_CFLAGS = $(MUTTER_LAUNCH_CFLAGS) -DLIBDIR=\"$(libdir)\"
mutter_launch_LDFLAGS = $(MUTTER_LAUNCH_LIBS) -lpam
install-exec-hook:
-chown root $(DESTDIR)$(bindir)/mutter-launch
-chmod u+s $(DESTDIR)$(bindir)/mutter-launch
if HAVE_INTROSPECTION
include $(INTROSPECTION_MAKEFILE)
@ -442,6 +432,15 @@ $(dbus_idle_built_sources) : Makefile.am org.gnome.Mutter.IdleMonitor.xml
--c-generate-object-manager \
$(srcdir)/org.gnome.Mutter.IdleMonitor.xml
dbus_login1_built_sources = meta-dbus-login1.c meta-dbus-login1.h
$(dbus_login1_built_sources) : Makefile.am org.freedesktop.login1.xml
$(AM_V_GEN)gdbus-codegen \
--interface-prefix org.freedesktop.login1 \
--c-namespace Login1 \
--generate-c-code meta-dbus-login1 \
$(srcdir)/org.freedesktop.login1.xml
%-protocol.c : $(srcdir)/wayland/protocol/%.xml
$(AM_V_GEN)$(WAYLAND_SCANNER) code < $< > $@
%-server-protocol.h : $(srcdir)/wayland/protocol/%.xml

107
src/backends/native/dbus-utils.c Normal file
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@ -0,0 +1,107 @@
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright (C) 2014 Red Hat
*
* 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.
*
* Written by:
* Jasper St. Pierre <jstpierre@mecheye.net>
*/
#include "config.h"
#include "dbus-utils.h"
#include <glib.h>
/* Stolen from tp_escape_as_identifier, from tp-glib,
* which follows the same escaping convention as systemd.
*/
static inline gboolean
_esc_ident_bad (gchar c, gboolean is_first)
{
return ((c < 'a' || c > 'z') &&
(c < 'A' || c > 'Z') &&
(c < '0' || c > '9' || is_first));
}
static gchar *
escape_dbus_component (const gchar *name)
{
gboolean bad = FALSE;
size_t len = 0;
GString *op;
const gchar *ptr, *first_ok;
g_return_val_if_fail (name != NULL, NULL);
/* fast path for empty name */
if (name[0] == '\0')
return g_strdup ("_");
for (ptr = name; *ptr; ptr++)
{
if (_esc_ident_bad (*ptr, ptr == name))
{
bad = TRUE;
len += 3;
}
else
len++;
}
/* fast path if it's clean */
if (!bad)
return g_strdup (name);
/* If strictly less than ptr, first_ok is the first uncopied safe character.
*/
first_ok = name;
op = g_string_sized_new (len);
for (ptr = name; *ptr; ptr++)
{
if (_esc_ident_bad (*ptr, ptr == name))
{
/* copy preceding safe characters if any */
if (first_ok < ptr)
{
g_string_append_len (op, first_ok, ptr - first_ok);
}
/* escape the unsafe character */
g_string_append_printf (op, "_%02x", (unsigned char)(*ptr));
/* restart after it */
first_ok = ptr + 1;
}
}
/* copy trailing safe characters if any */
if (first_ok < ptr)
{
g_string_append_len (op, first_ok, ptr - first_ok);
}
return g_string_free (op, FALSE);
}
char *
get_escaped_dbus_path (const char *prefix,
const char *component)
{
char *escaped_component = escape_dbus_component (component);
char *path = g_strconcat (prefix, "/", escaped_component, NULL);
g_free (escaped_component);
return path;
}

32
src/backends/native/dbus-utils.h Normal file
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@ -0,0 +1,32 @@
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright (C) 2014 Red Hat
*
* 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.
*
* Written by:
* Jasper St. Pierre <jstpierre@mecheye.net>
*/
#ifndef DBUS_UTILS_H
#define DBUS_UTILS_H
char *
get_escaped_dbus_path (const char *prefix,
const char *component);
#endif /* DBUS_UTILS_H */

441
src/backends/native/meta-launcher.c
View File

@ -20,9 +20,8 @@
#include "config.h"
#include "meta-launcher.h"
#include "weston-launch.h"
#include <gio/gunixfdmessage.h>
#include <gio/gunixfdlist.h>
#include <clutter/clutter.h>
#include <clutter/egl/clutter-egl.h>
@ -30,10 +29,17 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <malloc.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <systemd/sd-login.h>
#include "dbus-utils.h"
#include "meta-dbus-login1.h"
#include "wayland/meta-wayland-private.h"
#include "backends/meta-backend.h"
@ -41,153 +47,44 @@
struct _MetaLauncher
{
GSocket *weston_launch;
GSource *weston_launch_source;
Login1Session *session_proxy;
Login1Seat *seat_proxy;
gboolean vt_switched;
gboolean session_active;
};
/* AAA BBB CCC */
static void handle_request_vt_switch (MetaLauncher *self);
static gboolean
request_vt_switch_idle (gpointer user_data)
static Login1Session *
get_session_proxy (GCancellable *cancellable)
{
handle_request_vt_switch (user_data);
char *proxy_path;
char *session_id;
Login1Session *session_proxy;
return FALSE;
if (sd_pid_get_session (getpid (), &session_id) < 0)
return NULL;
proxy_path = get_escaped_dbus_path ("/org/freedesktop/login1/session", session_id);
session_proxy = login1_session_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START,
"org.freedesktop.login1",
proxy_path,
cancellable, NULL);
free (proxy_path);
return session_proxy;
}
static gboolean
send_message_to_wl (MetaLauncher *self,
void *message,
gsize size,
GSocketControlMessage *out_cmsg,
GSocketControlMessage **in_cmsg,
GError **error)
static Login1Seat *
get_seat_proxy (GCancellable *cancellable)
{
struct weston_launcher_reply reply;
GInputVector in_iov = { &reply, sizeof (reply) };
GOutputVector out_iov = { message, size };
GSocketControlMessage *out_all_cmsg[2];
GSocketControlMessage **in_all_cmsg;
int flags = 0;
int i;
out_all_cmsg[0] = out_cmsg;
out_all_cmsg[1] = NULL;
if (g_socket_send_message (self->weston_launch, NULL,
&out_iov, 1,
out_all_cmsg, -1,
flags, NULL, error) != (gssize)size)
return FALSE;
if (g_socket_receive_message (self->weston_launch, NULL,
&in_iov, 1,
&in_all_cmsg, NULL,
&flags, NULL, error) != sizeof (reply))
return FALSE;
while (reply.header.opcode != ((struct weston_launcher_message*)message)->opcode)
{
guint id;
/* There were events queued */
g_assert ((reply.header.opcode & WESTON_LAUNCHER_EVENT) == WESTON_LAUNCHER_EVENT);
/* This can never happen, because the only time mutter-launch can queue
this event is after confirming a VT switch, and we don't make requests
during that time.
Note that getting this event would be really bad, because we would be
in the wrong loop/context.
*/
g_assert (reply.header.opcode != WESTON_LAUNCHER_SERVER_VT_ENTER);
switch (reply.header.opcode)
{
case WESTON_LAUNCHER_SERVER_REQUEST_VT_SWITCH:
id = g_idle_add (request_vt_switch_idle, self);
g_source_set_name_by_id (id, "[mutter] request_vt_switch_idle");
break;
default:
g_assert_not_reached ();
}
if (g_socket_receive_message (self->weston_launch, NULL,
&in_iov, 1,
NULL, NULL,
&flags, NULL, error) != sizeof (reply))
return FALSE;
}
if (reply.ret != 0)
{
if (reply.ret == -1)
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Got failure from weston-launch");
else
g_set_error (error, G_IO_ERROR, g_io_error_from_errno (-reply.ret),
"Got failure from weston-launch: %s", strerror (-reply.ret));
for (i = 0; in_all_cmsg && in_all_cmsg[i]; i++)
g_object_unref (in_all_cmsg[i]);
g_free (in_all_cmsg);
return FALSE;
}
if (in_all_cmsg && in_all_cmsg[0])
{
for (i = 1; in_all_cmsg[i]; i++)
g_object_unref (in_all_cmsg[i]);
*in_cmsg = in_all_cmsg[0];
}
g_free (in_all_cmsg);
return TRUE;
}
static int
meta_launcher_open_device (MetaLauncher *self,
const char *name,
int flags,
GError **error)
{
struct weston_launcher_open *message;
GSocketControlMessage *cmsg;
gboolean ok;
gsize size;
int *fds, n_fd;
int ret;
size = sizeof (struct weston_launcher_open) + strlen (name) + 1;
message = g_malloc (size);
message->header.opcode = WESTON_LAUNCHER_OPEN;
message->flags = flags;
strcpy (message->path, name);
message->path[strlen(name)] = 0;
ok = send_message_to_wl (self, message, size, NULL, &cmsg, error);
if (ok)
{
g_assert (G_IS_UNIX_FD_MESSAGE (cmsg));
fds = g_unix_fd_message_steal_fds (G_UNIX_FD_MESSAGE (cmsg), &n_fd);
g_assert (n_fd == 1);
ret = fds[0];
g_free (fds);
g_object_unref (cmsg);
}
else
ret = -1;
g_free (message);
return ret;
return login1_seat_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START,
"org.freedesktop.login1",
"/org/freedesktop/login1/seat/self",
cancellable, NULL);
}
/* QQQ RRR SSS */
@ -228,155 +125,246 @@ session_pause (void)
clutter_egl_freeze_master_clock ();
}
static gboolean
take_device (Login1Session *session_proxy,
int dev_major,
int dev_minor,
int *out_fd,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
GVariant *fd_variant = NULL;
int fd = -1;
GUnixFDList *fd_list;
if (!login1_session_call_take_device_sync (session_proxy,
dev_major,
dev_minor,
NULL,
&fd_variant,
NULL, /* paused */
&fd_list,
cancellable,
error))
goto out;
fd = g_unix_fd_list_get (fd_list, g_variant_get_handle (fd_variant), error);
if (fd == -1)
goto out;
*out_fd = fd;
ret = TRUE;
out:
if (fd_variant)
g_variant_unref (fd_variant);
if (fd_list)
g_object_unref (fd_list);
return ret;
}
static gboolean
get_device_info_from_path (const char *path,
int *out_major,
int *out_minor)
{
gboolean ret = FALSE;
int r;
struct stat st;
r = stat (path, &st);
if (r < 0)
goto out;
if (!S_ISCHR (st.st_mode))
goto out;
*out_major = major (st.st_rdev);
*out_minor = minor (st.st_rdev);
ret = TRUE;
out:
return ret;
}
static gboolean
get_device_info_from_fd (int fd,
int *out_major,
int *out_minor)
{
gboolean ret = FALSE;
int r;
struct stat st;
r = fstat (fd, &st);
if (r < 0)
goto out;
if (!S_ISCHR (st.st_mode))
goto out;
*out_major = major (st.st_rdev);
*out_minor = minor (st.st_rdev);
ret = TRUE;
out:
return ret;
}
static int
on_evdev_device_open (const char *path,
int flags,
gpointer user_data,
GError **error)
{
MetaLauncher *launcher = user_data;
MetaLauncher *self = user_data;
int fd;
int major, minor;
return meta_launcher_open_device (launcher, path, flags, error);
if (!get_device_info_from_path (path, &major, &minor))
{
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_NOT_FOUND,
"Could not get device info for path %s: %m", path);
return -1;
}
if (!take_device (self->session_proxy, major, minor, &fd, NULL, error))
return -1;
return fd;
}
static void
on_evdev_device_close (int fd,
gpointer user_data)
{
close (fd);
MetaLauncher *self = user_data;
int major, minor;
GError *error = NULL;
if (!get_device_info_from_fd (fd, &major, &minor))
{
g_warning ("Could not get device info for fd %d: %m", fd);
return;
}
if (!login1_session_call_release_device_sync (self->session_proxy,
major, minor,
NULL, &error))
{
g_warning ("Could not release device %d,%d: %s", major, minor, error->message);
}
}
/* TTT UUU VVV */
static void
handle_vt_enter (MetaLauncher *launcher)
sync_active (MetaLauncher *self)
{
g_assert (launcher->vt_switched);
launcher->vt_switched = FALSE;
gboolean active = login1_session_get_active (LOGIN1_SESSION (self->session_proxy));
session_unpause ();
if (active == self->session_active)
return;
self->session_active = active;
if (active)
session_unpause ();
else
session_pause ();
}
static void
handle_request_vt_switch (MetaLauncher *launcher)
on_active_changed (Login1Session *session,
GParamSpec *pspec,
gpointer user_data)
{
struct weston_launcher_message message;
GError *error;
gboolean ok;
session_pause ();
message.opcode = WESTON_LAUNCHER_CONFIRM_VT_SWITCH;
error = NULL;
ok = send_message_to_wl (launcher, &message, sizeof (message), NULL, NULL, &error);
if (!ok) {
g_warning ("Failed to acknowledge VT switch: %s", error->message);
g_error_free (error);
return;
}
g_assert (!launcher->vt_switched);
launcher->vt_switched = TRUE;
session_unpause ();
MetaLauncher *self = user_data;
sync_active (self);
}
static gboolean
on_socket_readable (GSocket *socket,
GIOCondition condition,
gpointer user_data)
get_kms_fd (Login1Session *session_proxy,
int *fd_out)
{
MetaLauncher *launcher = user_data;
struct weston_launcher_event event;
gssize read;
GError *error;
int major, minor;
int fd;
GError *error = NULL;
if ((condition & G_IO_IN) == 0)
return TRUE;
error = NULL;
read = g_socket_receive (socket, (char*)&event, sizeof(event), NULL, &error);
if (read < (gssize)sizeof(event))
/* XXX -- use udev to find the DRM master device */
if (!get_device_info_from_path ("/dev/dri/card0", &major, &minor))
{
g_warning ("Error reading from weston-launcher socket: %s", error->message);
g_warning ("Could not stat /dev/dri/card0: %m");
return FALSE;
}
if (!take_device (session_proxy, major, minor, &fd, NULL, &error))
{
g_warning ("Could not open DRM device: %s\n", error->message);
g_error_free (error);
return TRUE;
return FALSE;
}
switch (event.header.opcode)
{
case WESTON_LAUNCHER_SERVER_REQUEST_VT_SWITCH:
handle_request_vt_switch (launcher);
break;
case WESTON_LAUNCHER_SERVER_VT_ENTER:
handle_vt_enter (launcher);
break;
}
*fd_out = fd;
return TRUE;
}
static int
env_get_fd (const char *env)
{
const char *value;
value = g_getenv (env);
if (value == NULL)
return -1;
else
return g_ascii_strtoll (value, NULL, 10);
}
/* XXX YYY ZZZ */
MetaLauncher *
meta_launcher_new (void)
{
MetaLauncher *self = g_slice_new0 (MetaLauncher);
MetaLauncher *self;
Login1Session *session_proxy;
GError *error = NULL;
int launch_fd;
int kms_fd;
launch_fd = env_get_fd ("WESTON_LAUNCHER_SOCK");
if (launch_fd < 0)
g_error ("Invalid mutter-launch socket");
session_proxy = get_session_proxy (NULL);
if (!login1_session_call_take_control_sync (session_proxy, FALSE, NULL, &error))
{
g_warning ("Could not take control: %s", error->message);
g_error_free (error);
return NULL;
}
self->weston_launch = g_socket_new_from_fd (launch_fd, NULL);
if (!get_kms_fd (session_proxy, &kms_fd))
return NULL;
self->weston_launch_source = g_socket_create_source (self->weston_launch, G_IO_IN, NULL);
g_source_set_callback (self->weston_launch_source, (GSourceFunc)on_socket_readable, self, NULL);
g_source_attach (self->weston_launch_source, NULL);
g_source_unref (self->weston_launch_source);
self = g_slice_new0 (MetaLauncher);
self->session_proxy = session_proxy;
self->seat_proxy = get_seat_proxy (NULL);
kms_fd = meta_launcher_open_device (self, "/dev/dri/card0", O_RDWR, &error);
if (error)
g_error ("Failed to open /dev/dri/card0: %s", error->message);
self->session_active = TRUE;
clutter_egl_set_kms_fd (kms_fd);
clutter_evdev_set_device_callbacks (on_evdev_device_open,
on_evdev_device_close,
self);
g_signal_connect (self->session_proxy, "notify::active", G_CALLBACK (on_active_changed), self);
return self;
}
void
meta_launcher_free (MetaLauncher *launcher)
meta_launcher_free (MetaLauncher *self)
{
g_source_destroy (launcher->weston_launch_source);
g_object_unref (launcher->weston_launch);
g_slice_free (MetaLauncher, launcher);
g_object_unref (self->seat_proxy);
g_object_unref (self->session_proxy);
g_slice_free (MetaLauncher, self);
}
gboolean
meta_launcher_activate_session (MetaLauncher *launcher,
GError **error)
{
return meta_launcher_activate_vt (launcher, -1, error);
if (!login1_session_call_activate_sync (launcher->session_proxy, NULL, error))
return FALSE;
sync_active (launcher);
return TRUE;
}
gboolean
@ -384,10 +372,5 @@ meta_launcher_activate_vt (MetaLauncher *launcher,
signed char vt,
GError **error)
{
struct weston_launcher_activate_vt message;
message.header.opcode = WESTON_LAUNCHER_ACTIVATE_VT;
message.vt = vt;
return send_message_to_wl (launcher, &message, sizeof (message), NULL, NULL, error);
return login1_seat_call_switch_to_sync (launcher->seat_proxy, vt, NULL, error);
}

711
src/backends/native/weston-launch.c
View File

@ -1,711 +0,0 @@
/*
* Copyright © 2012 Benjamin Franzke
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of the copyright holders not be used in
* advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. The copyright holders make
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <poll.h>
#include <errno.h>
#include <error.h>
#include <getopt.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/signalfd.h>
#include <signal.h>
#include <unistd.h>
#include <fcntl.h>
#include <limits.h>
#include <termios.h>
#include <linux/vt.h>
#include <linux/major.h>
#include <linux/kd.h>
#include <pwd.h>
#include <grp.h>
#include <xf86drm.h>
#include <systemd/sd-login.h>
#include "weston-launch.h"
#define MAX_ARGV_SIZE 256
#define DRM_MAJOR 226
enum vt_state {
VT_HAS_VT,
VT_PENDING_CONFIRM,
VT_NOT_HAVE_VT,
};
struct weston_launch {
int tty;
int ttynr;
int sock[2];
struct passwd *pw;
int signalfd;
pid_t child;
int verbose;
struct termios terminal_attributes;
int kb_mode;
enum vt_state vt_state;
unsigned vt;
int drm_fd;
};
union cmsg_data { unsigned char b[4]; int fd; };
static void quit (struct weston_launch *wl, int status);
static int
weston_launch_allowed(struct weston_launch *wl)
{
char *session, *seat;
int err;
if (getuid() == 0)
return 1;
err = sd_pid_get_session(getpid(), &session);
if (err == 0 && session) {
if (sd_session_is_active(session) &&
sd_session_get_seat(session, &seat) == 0) {
free(seat);
free(session);
return 1;
}
free(session);
}
return 0;
}
static int
setup_launcher_socket(struct weston_launch *wl)
{
if (socketpair(AF_LOCAL, SOCK_DGRAM, 0, wl->sock) < 0)
error(1, errno, "socketpair failed");
fcntl(wl->sock[0], F_SETFD, O_CLOEXEC);
return 0;
}
static int
setup_signals(struct weston_launch *wl)
{
int ret;
sigset_t mask;
struct sigaction sa;
memset(&sa, 0, sizeof sa);
sa.sa_handler = SIG_DFL;
sa.sa_flags = SA_NOCLDSTOP | SA_RESTART;
ret = sigaction(SIGCHLD, &sa, NULL);
assert(ret == 0);
sa.sa_handler = SIG_IGN;
sa.sa_flags = 0;
sigaction(SIGHUP, &sa, NULL);
ret = sigemptyset(&mask);
assert(ret == 0);
sigaddset(&mask, SIGCHLD);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGTERM);
sigaddset(&mask, SIGUSR1);
ret = sigprocmask(SIG_BLOCK, &mask, NULL);
assert(ret == 0);
wl->signalfd = signalfd(-1, &mask, SFD_NONBLOCK | SFD_CLOEXEC);
if (wl->signalfd < 0)
return -errno;
return 0;
}
static void
setenv_fd(const char *env, int fd)
{
char buf[32];
snprintf(buf, sizeof buf, "%d", fd);
setenv(env, buf, 1);
}
static int
handle_confirm_vt_switch(struct weston_launch *wl, struct msghdr *msg, ssize_t len)
{
struct weston_launcher_reply reply;
reply.header.opcode = WESTON_LAUNCHER_CONFIRM_VT_SWITCH;
reply.ret = -1;
if (wl->vt_state != VT_PENDING_CONFIRM) {
error(0, 0, "unexpected CONFIRM_VT_SWITCH");
goto out;
}
if (wl->drm_fd != -1) {
int ret;
ret = drmDropMaster(wl->drm_fd);
if (ret < 0) {
fprintf(stderr, "failed to drop DRM master: %m\n");
} else if (wl->verbose) {
fprintf(stderr, "dropped DRM master for VT switch\n");
}
}
wl->vt_state = VT_NOT_HAVE_VT;
ioctl(wl->tty, VT_RELDISP, 1);
if (wl->verbose)
fprintf(stderr, "mutter-launcher: confirmed VT switch\n");
reply.ret = 0;
out:
do {
len = send(wl->sock[0], &reply, sizeof reply, 0);
} while (len < 0 && errno == EINTR);
if (len < 0)
return -1;
return 0;
}
static int
handle_activate_vt(struct weston_launch *wl, struct msghdr *msg, ssize_t len)
{
struct weston_launcher_reply reply;
struct weston_launcher_activate_vt *message;
unsigned vt;
reply.header.opcode = WESTON_LAUNCHER_ACTIVATE_VT;
reply.ret = -1;
if (len != sizeof(*message)) {
error(0, 0, "missing value in activate_vt request");
goto out;
}
message = msg->msg_iov->iov_base;
/* Negative values mean that we're activating our own VT */
if (message->vt > 0)
vt = message->vt;
else
vt = wl->vt;
reply.ret = ioctl(wl->tty, VT_ACTIVATE, vt);
if (reply.ret < 0)
reply.ret = -errno;
if (wl->verbose)
fprintf(stderr, "mutter-launch: activate VT, ret: %d\n", reply.ret);
out:
do {
len = send(wl->sock[0], &reply, sizeof reply, 0);
} while (len < 0 && errno == EINTR);
if (len < 0)
return -1;
return 0;
}
static int
handle_open(struct weston_launch *wl, struct msghdr *msg, ssize_t len)
{
struct weston_launcher_reply reply;
int fd = -1;
char control[CMSG_SPACE(sizeof(fd))];
struct cmsghdr *cmsg;
struct stat s;
struct msghdr nmsg;
struct iovec iov;
struct weston_launcher_open *message;
union cmsg_data *data;
int dev_major;
reply.header.opcode = WESTON_LAUNCHER_OPEN;
reply.ret = -1;
message = msg->msg_iov->iov_base;
if ((size_t)len < sizeof(*message))
goto err0;
/* Ensure path is null-terminated */
((char *) message)[len-1] = '\0';
if (stat(message->path, &s) < 0) {
reply.ret = -errno;
goto err0;
}
dev_major = major(s.st_rdev);
if (dev_major != INPUT_MAJOR &&
dev_major != DRM_MAJOR) {
fprintf(stderr, "Device %s is not an input or DRM device\n",
message->path);
reply.ret = -EPERM;
goto err0;
}
if (dev_major == DRM_MAJOR && wl->drm_fd != -1) {
fprintf(stderr, "Already have a DRM device open\n");
reply.ret = -EPERM;
goto err0;
}
fd = open(message->path, message->flags);
if (fd < 0) {
fprintf(stderr, "Error opening device %s: %m\n",
message->path);
reply.ret = -errno;
goto err0;
}
if (dev_major == DRM_MAJOR) {
wl->drm_fd = fd;
}
err0:
memset(&nmsg, 0, sizeof nmsg);
nmsg.msg_iov = &iov;
nmsg.msg_iovlen = 1;
if (fd != -1) {
nmsg.msg_control = control;
nmsg.msg_controllen = sizeof control;
cmsg = CMSG_FIRSTHDR(&nmsg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
data = (union cmsg_data *) CMSG_DATA(cmsg);
data->fd = fd;
nmsg.msg_controllen = cmsg->cmsg_len;
reply.ret = 0;
}
iov.iov_base = &reply;
iov.iov_len = sizeof reply;
if (wl->verbose)
fprintf(stderr, "mutter-launch: opened %s: ret: %d, fd: %d\n",
message->path, reply.ret, fd);
do {
len = sendmsg(wl->sock[0], &nmsg, 0);
} while (len < 0 && errno == EINTR);
close(fd);
if (len < 0)
return -1;
return 0;
}
static int
handle_socket_msg(struct weston_launch *wl)
{
char control[CMSG_SPACE(sizeof(int))];
char buf[BUFSIZ];
struct msghdr msg;
struct iovec iov;
int ret = -1;
ssize_t len;
struct weston_launcher_message *message;
memset(&msg, 0, sizeof(msg));
iov.iov_base = buf;
iov.iov_len = sizeof buf;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = control;
msg.msg_controllen = sizeof control;
do {
len = recvmsg(wl->sock[0], &msg, 0);
} while (len < 0 && errno == EINTR);
if (len < 1)
return -1;
message = (void *) buf;
switch (message->opcode) {
case WESTON_LAUNCHER_OPEN:
ret = handle_open(wl, &msg, len);
break;
case WESTON_LAUNCHER_CONFIRM_VT_SWITCH:
ret = handle_confirm_vt_switch(wl, &msg, len);
break;
case WESTON_LAUNCHER_ACTIVATE_VT:
ret = handle_activate_vt(wl, &msg, len);
break;
}
return ret;
}
static void
tty_reset(struct weston_launch *wl)
{
struct vt_mode mode = { 0 };
if (ioctl(wl->tty, KDSKBMODE, wl->kb_mode))
fprintf(stderr, "failed to restore keyboard mode: %m\n");
if (ioctl(wl->tty, KDSETMODE, KD_TEXT))
fprintf(stderr, "failed to set KD_TEXT mode on tty: %m\n");
if (tcsetattr(wl->tty, TCSANOW, &wl->terminal_attributes) < 0)
fprintf(stderr, "could not restore terminal to canonical mode\n");
mode.mode = VT_AUTO;
if (ioctl(wl->tty, VT_SETMODE, &mode) < 0)
fprintf(stderr, "could not reset vt handling\n");
}
static void
quit(struct weston_launch *wl, int status)
{
if (wl->child > 0)
kill(wl->child, SIGKILL);
close(wl->signalfd);
close(wl->sock[0]);
if (wl->drm_fd > 0)
close(wl->drm_fd);
tty_reset(wl);
exit(status);
}
static int
handle_vt_switch(struct weston_launch *wl)
{
struct weston_launcher_event message;
ssize_t len;
if (wl->vt_state == VT_HAS_VT) {
wl->vt_state = VT_PENDING_CONFIRM;
message.header.opcode = WESTON_LAUNCHER_SERVER_REQUEST_VT_SWITCH;
} else if (wl->vt_state == VT_NOT_HAVE_VT) {
wl->vt_state = VT_HAS_VT;
ioctl(wl->tty, VT_RELDISP, VT_ACKACQ);
if (wl->drm_fd != -1) {
int ret;
ret = drmSetMaster(wl->drm_fd);
if (ret < 0) {
fprintf(stderr, "failed to become DRM master: %m\n");
/* This is very, very bad, and the compositor will crash soon,
but oh well... */
} else if (wl->verbose) {
fprintf(stderr, "became DRM master after VT switch\n");
}
}
message.header.opcode = WESTON_LAUNCHER_SERVER_VT_ENTER;
} else
return -1;
message.detail = 0;
do {
len = send(wl->sock[0], &message, sizeof(message), 0);
} while (len < 0 && errno == EINTR);
return 0;
}
static int
handle_signal(struct weston_launch *wl)
{
struct signalfd_siginfo sig;
int pid, status, ret;
if (read(wl->signalfd, &sig, sizeof sig) != sizeof sig) {
error(0, errno, "reading signalfd failed");
return -1;
}
switch (sig.ssi_signo) {
case SIGCHLD:
pid = waitpid(-1, &status, 0);
if (pid == wl->child) {
wl->child = 0;
if (WIFEXITED(status))
ret = WEXITSTATUS(status);
else if (WIFSIGNALED(status))
/*
* If weston dies because of signal N, we
* return 10+N. This is distinct from
* weston-launch dying because of a signal
* (128+N).
*/
ret = 10 + WTERMSIG(status);
else
ret = 0;
quit(wl, ret);
}
break;
case SIGTERM:
case SIGINT:
if (wl->child)
kill(wl->child, sig.ssi_signo);
break;
case SIGUSR1:
return handle_vt_switch(wl);
default:
return -1;
}
return 0;
}
static int
setup_tty(struct weston_launch *wl)
{
struct stat buf;
struct termios raw_attributes;
struct vt_mode mode = { 0 };
char *session;
char path[PATH_MAX];
int ok;
ok = sd_pid_get_session(getpid(), &session);
if (ok < 0)
error(1, -ok, "could not determine current session");
ok = sd_session_get_vt(session, &wl->vt);
if (ok < 0)
error(1, -ok, "could not determine current TTY");
snprintf(path, PATH_MAX, "/dev/tty%u", wl->vt);
wl->tty = open(path, O_RDWR | O_NOCTTY | O_CLOEXEC);
if (wl->tty < 0)
error(1, errno, "failed to open tty");
if (fstat(wl->tty, &buf) < 0)
error(1, errno, "stat %s failed", path);
if (major(buf.st_rdev) != TTY_MAJOR)
error(1, 0, "invalid tty device: %s", path);
wl->ttynr = minor(buf.st_rdev);
if (tcgetattr(wl->tty, &wl->terminal_attributes) < 0)
error(1, errno, "could not get terminal attributes");
/* Ignore control characters and disable echo */
raw_attributes = wl->terminal_attributes;
cfmakeraw(&raw_attributes);
/* Fix up line endings to be normal (cfmakeraw hoses them) */
raw_attributes.c_oflag |= OPOST | OCRNL;
/* Don't generate ttou signals */
raw_attributes.c_oflag &= ~TOSTOP;
if (tcsetattr(wl->tty, TCSANOW, &raw_attributes) < 0)
error(1, errno, "could not put terminal into raw mode");
ioctl(wl->tty, KDGKBMODE, &wl->kb_mode);
ok = ioctl(wl->tty, KDSKBMODE, K_OFF);
if (ok < 0) {
ok = ioctl(wl->tty, KDSKBMODE, K_RAW);
if (ok < 0)
error(1, errno, "failed to set keyboard mode on tty");
}
ok = ioctl(wl->tty, KDSETMODE, KD_GRAPHICS);
if (ok < 0)
error(1, errno, "failed to set KD_GRAPHICS mode on tty");
wl->vt_state = VT_HAS_VT;
mode.mode = VT_PROCESS;
mode.relsig = SIGUSR1;
mode.acqsig = SIGUSR1;
ok = ioctl(wl->tty, VT_SETMODE, &mode);
if (ok < 0)
error(1, errno, "failed to take control of vt handling");
return 0;
}
static void
drop_privileges(struct weston_launch *wl)
{
if (setgid(wl->pw->pw_gid) < 0 ||
#ifdef HAVE_INITGROUPS
initgroups(wl->pw->pw_name, wl->pw->pw_gid) < 0 ||
#endif
setuid(wl->pw->pw_uid) < 0)
error(1, errno, "dropping privileges failed");
}
static void
launch_compositor(struct weston_launch *wl, int argc, char *argv[])
{
char command[PATH_MAX];
char *child_argv[MAX_ARGV_SIZE];
sigset_t mask;
int i;
if (wl->verbose)
printf("weston-launch: spawned weston with pid: %d\n", getpid());
drop_privileges(wl);
setenv_fd("WESTON_LAUNCHER_SOCK", wl->sock[1]);
setenv("LD_LIBRARY_PATH", LIBDIR, 1);
unsetenv("DISPLAY");
/* Do not give our signal mask to the new process. */
sigemptyset(&mask);
sigaddset(&mask, SIGTERM);
sigaddset(&mask, SIGCHLD);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGUSR1);
sigprocmask(SIG_UNBLOCK, &mask, NULL);
snprintf (command, PATH_MAX, "%s \"$@\"", argv[0]);
child_argv[0] = wl->pw->pw_shell;
child_argv[1] = "-l";
child_argv[2] = "-c";
child_argv[3] = command;
for (i = 0; i < argc; ++i)
child_argv[4 + i] = argv[i];
child_argv[4 + i] = NULL;
execv(child_argv[0], child_argv);
error(1, errno, "exec failed");
}
static void
help(const char *name)
{
fprintf(stderr, "Usage: %s [args...] [-- [weston args..]]\n", name);
fprintf(stderr, " -u, --user Start session as specified username\n");
fprintf(stderr, " -v, --verbose Be verbose\n");
fprintf(stderr, " -h, --help Display this help message\n");
}
int
main(int argc, char *argv[])
{
struct weston_launch wl;
int i, c;
struct option opts[] = {
{ "verbose", no_argument, NULL, 'v' },
{ "help", no_argument, NULL, 'h' },
{ 0, 0, NULL, 0 }
};
memset(&wl, 0, sizeof wl);
wl.drm_fd = -1;
while ((c = getopt_long(argc, argv, "u:t::vh", opts, &i)) != -1) {
switch (c) {
case 'v':
wl.verbose = 1;
break;
case 'h':
help("mutter-launch");
exit(EXIT_FAILURE);
}
}
if ((argc - optind) > (MAX_ARGV_SIZE - 6))
error(1, E2BIG, "Too many arguments to pass to weston");
if (optind >= argc)
error(1, 0, "Expected program argument");
wl.pw = getpwuid(getuid());
if (wl.pw == NULL)
error(1, errno, "failed to get username");
if (!weston_launch_allowed(&wl))
error(1, 0, "Permission denied. You must run from an active and local (systemd) session.");
if (setup_tty(&wl) < 0)
exit(EXIT_FAILURE);
if (setup_launcher_socket(&wl) < 0)
exit(EXIT_FAILURE);
if (setup_signals(&wl) < 0)
exit(EXIT_FAILURE);
wl.child = fork();
if (wl.child == -1) {
error(1, errno, "fork failed");
exit(EXIT_FAILURE);
}
if (wl.child == 0)
launch_compositor(&wl, argc - optind, argv + optind);
close(wl.sock[1]);
while (1) {
struct pollfd fds[2];
int n;
fds[0].fd = wl.sock[0];
fds[0].events = POLLIN;
fds[1].fd = wl.signalfd;
fds[1].events = POLLIN;
n = poll(fds, 2, -1);
if (n < 0)
error(0, errno, "poll failed");
if (fds[0].revents & POLLIN)
handle_socket_msg(&wl);
if (fds[1].revents)
handle_signal(&wl);
}
return 0;
}

68
src/backends/native/weston-launch.h
View File

@ -1,68 +0,0 @@
/*
* Copyright © 2012 Benjamin Franzke
* 2013 Red Hat, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of the copyright holders not be used in
* advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. The copyright holders make
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _WESTON_LAUNCH_H_
#define _WESTON_LAUNCH_H_
enum weston_launcher_message_type {
WESTON_LAUNCHER_REQUEST,
WESTON_LAUNCHER_EVENT,
};
enum weston_launcher_opcode {
WESTON_LAUNCHER_OPEN = (1 << 1 | WESTON_LAUNCHER_REQUEST),
WESTON_LAUNCHER_ACTIVATE_VT = (2 << 1 | WESTON_LAUNCHER_REQUEST),
WESTON_LAUNCHER_CONFIRM_VT_SWITCH = (3 << 1 | WESTON_LAUNCHER_REQUEST),
};
enum weston_launcher_server_opcode {
WESTON_LAUNCHER_SERVER_REQUEST_VT_SWITCH = (1 << 1 | WESTON_LAUNCHER_EVENT),
WESTON_LAUNCHER_SERVER_VT_ENTER = (2 << 1 | WESTON_LAUNCHER_EVENT),
};
struct weston_launcher_message {
int opcode;
};
struct weston_launcher_open {
struct weston_launcher_message header;
int flags;
char path[0];
};
struct weston_launcher_activate_vt {
struct weston_launcher_message header;
signed char vt;
};
struct weston_launcher_reply {
struct weston_launcher_message header;
int ret;
};
struct weston_launcher_event {
struct weston_launcher_message header;
int detail; /* unused, but makes sure replies and events are serialized the same */
};
#endif

2
src/mutter-wayland.desktop.in
View File

@ -1,7 +1,7 @@
[Desktop Entry]
Type=Application
_Name=Mutter (wayland compositor)
Exec=mutter-launch -- mutter --wayland --display-server
Exec=mutter --wayland --display-server
NoDisplay=true
# name of loadable control center module
X-GNOME-WMSettingsModule=metacity

44
src/org.freedesktop.login1.xml Normal file
View File

@ -0,0 +1,44 @@
<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<node>
<interface name="org.freedesktop.login1.Session">
<property name="Active" type="b" access="read" />
<method name="Activate">
</method>
<method name="TakeControl">
<arg name="force" type="b"/>
</method>
<method name="TakeDevice">
<annotation name="org.gtk.GDBus.C.UnixFD" value="true"/>
<arg name="major" type="u" direction="in"/>
<arg name="minor" type="u" direction="in"/>
<arg name="fd" type="h" direction="out"/>
<arg name="paused" type="b" direction="out"/>
</method>
<method name="ReleaseDevice">
<arg name="major" type="u"/>
<arg name="minor" type="u"/>
</method>
<method name="PauseDeviceComplete">
<arg name="major" type="u"/>
<arg name="minor" type="u"/>
</method>
<signal name="PauseDevice">
<arg name="major" type="u"/>
<arg name="minor" type="u"/>
<arg name="type" type="s"/>
</signal>
<signal name="ResumeDevice">
<arg name="major" type="u"/>
<arg name="minor" type="u"/>
<arg name="fd" type="h"/>
</signal>
</interface>
<interface name="org.freedesktop.login1.Seat">
<method name="SwitchTo">
<arg name="vt" type="u"/>
</method>
</interface>
</node>