def verify_display(xvfb=None,
display_name=None,
shadowing=False,
log_errors=True):
#check that we can access the X11 display:
from xpra.x11.vfb_util import verify_display_ready
if not verify_display_ready(xvfb, display_name, shadowing, log_errors):
return 1
from xpra.log import Logger
log = Logger("screen", "x11")
log("X11 display is ready")
no_gtk()
from xpra.x11.gtk_x11.gdk_display_source import verify_gdk_display
display = verify_gdk_display(display_name)
if not display:
return 1
log("GDK can access the display")
return 0
def do_run_server(error_cb, opts, mode, xpra_file, extra_args, desktop_display=None):
assert mode in (
"start", "start-desktop",
"upgrade", "upgrade-desktop",
"shadow", "proxy",
)
try:
cwd = os.getcwd()
except OSError:
cwd = os.path.expanduser("~")
warn("current working directory does not exist, using '%s'\n" % cwd)
validate_encryption(opts)
if opts.encoding=="help" or "help" in opts.encodings:
return show_encoding_help(opts)
#remove anything pointing to dbus from the current env
#(so we only detect a dbus instance started by pam,
# and override everything else)
for k in tuple(os.environ.keys()):
if k.startswith("DBUS_"):
del os.environ[k]
starting = mode == "start"
starting_desktop = mode == "start-desktop"
upgrading = mode == "upgrade"
upgrading_desktop = mode == "upgrade-desktop"
shadowing = mode == "shadow"
proxying = mode == "proxy"
clobber = upgrading or upgrading_desktop or opts.use_display
start_vfb = not (shadowing or proxying or clobber)
if not proxying and PYTHON3 and POSIX and not OSX:
#we don't support wayland servers,
#so make sure GDK will use the X11 backend:
os.environ["GDK_BACKEND"] = "x11"
if proxying or upgrading or upgrading_desktop:
#when proxying or upgrading, don't exec any plain start commands:
opts.start = opts.start_child = []
elif opts.exit_with_children:
assert opts.start_child, "exit-with-children was specified but start-child is missing!"
elif opts.start_child:
warn("Warning: the 'start-child' option is used,")
warn(" but 'exit-with-children' is not enabled,")
warn(" use 'start' instead")
if opts.bind_rfb and (proxying or starting):
get_util_logger().warn("Warning: bind-rfb sockets cannot be used with '%s' mode" % mode)
opts.bind_rfb = ""
if not shadowing and not starting_desktop:
opts.rfb_upgrade = 0
if upgrading or upgrading_desktop or shadowing:
#there should already be one running
opts.pulseaudio = False
#get the display name:
if shadowing and not extra_args:
if WIN32 or OSX:
#just a virtual name for the only display available:
display_name = ":0"
else:
from xpra.scripts.main import guess_X11_display
dotxpra = DotXpra(opts.socket_dir, opts.socket_dirs)
display_name = guess_X11_display(dotxpra, desktop_display)
elif (upgrading or upgrading_desktop) and not extra_args:
display_name = guess_xpra_display(opts.socket_dir, opts.socket_dirs)
else:
if len(extra_args) > 1:
error_cb("too many extra arguments (%i): only expected a display number" % len(extra_args))
if len(extra_args) == 1:
display_name = extra_args[0]
if not shadowing and not proxying and not opts.use_display:
display_name_check(display_name)
else:
if proxying:
#find a free display number:
dotxpra = DotXpra(opts.socket_dir, opts.socket_dirs)
all_displays = dotxpra.sockets()
#ie: [("LIVE", ":100"), ("LIVE", ":200"), ...]
displays = [v[1] for v in all_displays]
display_name = None
for x in range(1000, 20000):
v = ":%s" % x
if v not in displays:
display_name = v
break
if not display_name:
error_cb("you must specify a free virtual display name to use with the proxy server")
elif opts.use_display:
#only use automatic guess for xpra displays and not X11 displays:
display_name = guess_xpra_display(opts.socket_dir, opts.socket_dirs)
else:
# We will try to find one automaticaly
# Use the temporary magic value 'S' as marker:
display_name = 'S' + str(os.getpid())
if not (shadowing or proxying or upgrading or upgrading_desktop) and \
opts.exit_with_children and not opts.start_child:
error_cb("--exit-with-children specified without any children to spawn; exiting immediately")
atexit.register(run_cleanups)
# Generate the script text now, because os.getcwd() will
# change if/when we daemonize:
from xpra.server.server_util import (
xpra_runner_shell_script,
write_runner_shell_scripts,
find_log_dir,
create_input_devices,
)
script = xpra_runner_shell_script(xpra_file, cwd, opts.socket_dir)
uid = int(opts.uid)
gid = int(opts.gid)
username = get_username_for_uid(uid)
home = get_home_for_uid(uid)
xauth_data = None
if start_vfb:
xauth_data = get_hex_uuid()
ROOT = POSIX and getuid()==0
protected_fds = []
protected_env = {}
stdout = sys.stdout
stderr = sys.stderr
# Daemonize:
if POSIX and opts.daemon:
#daemonize will chdir to "/", so try to use an absolute path:
if opts.password_file:
opts.password_file = tuple(os.path.abspath(x) for x in opts.password_file)
from xpra.server.server_util import daemonize
daemonize()
displayfd = 0
if POSIX and opts.displayfd:
try:
displayfd = int(opts.displayfd)
if displayfd>0:
protected_fds.append(displayfd)
except ValueError as e:
stderr.write("Error: invalid displayfd '%s':\n" % opts.displayfd)
stderr.write(" %s\n" % e)
del e
# if pam is present, try to create a new session:
pam = None
PAM_OPEN = POSIX and envbool("XPRA_PAM_OPEN", ROOT and uid!=0)
if PAM_OPEN:
try:
from xpra.server.pam import pam_session #@UnresolvedImport
except ImportError as e:
stderr.write("Error: failed to import pam module\n")
stderr.write(" %s" % e)
del e
PAM_OPEN = False
if PAM_OPEN:
fdc = FDChangeCaptureContext()
with fdc:
pam = pam_session(username)
env = {
#"XDG_SEAT" : "seat1",
#"XDG_VTNR" : "0",
"XDG_SESSION_TYPE" : "x11",
#"XDG_SESSION_CLASS" : "user",
"XDG_SESSION_DESKTOP" : "xpra",
}
#maybe we should just bail out instead?
if pam.start():
pam.set_env(env)
items = {}
if display_name.startswith(":"):
items["XDISPLAY"] = display_name
if xauth_data:
items["XAUTHDATA"] = xauth_data
pam.set_items(items)
if pam.open():
#we can't close it, because we're not going to be root any more,
#but since we're the process leader for the session,
#terminating will also close the session
#add_cleanup(pam.close)
protected_env = pam.get_envlist()
os.environ.update(protected_env)
#closing the pam fd causes the session to be closed,
#and we don't want that!
protected_fds += fdc.get_new_fds()
#get XDG_RUNTIME_DIR from env options,
#which may not be have updated os.environ yet when running as root with "--uid="
xrd = os.path.abspath(parse_env(opts.env).get("XDG_RUNTIME_DIR", ""))
if ROOT and (uid>0 or gid>0):
#we're going to chown the directory if we create it,
#ensure this cannot be abused, only use "safe" paths:
if not any(x for x in ("/run/user/%i" % uid, "/tmp", "/var/tmp") if xrd.startswith(x)):
xrd = ""
#these paths could cause problems if we were to create and chown them:
if xrd.startswith("/tmp/.X11-unix") or xrd.startswith("/tmp/.XIM-unix"):
xrd = ""
if not xrd:
xrd = os.environ.get("XDG_RUNTIME_DIR")
xrd = create_runtime_dir(xrd, uid, gid)
if xrd:
#this may override the value we get from pam
#with the value supplied by the user:
protected_env["XDG_RUNTIME_DIR"] = xrd
if POSIX and not ROOT:
# Write out a shell-script so that we can start our proxy in a clean
# environment:
write_runner_shell_scripts(script)
if start_vfb or opts.daemon:
#we will probably need a log dir
#either for the vfb, or for our own log file
log_dir = opts.log_dir or ""
if not log_dir or log_dir.lower()=="auto":
log_dir = find_log_dir(username, uid=uid, gid=gid)
if not log_dir:
raise InitException("cannot find or create a logging directory")
#expose the log-dir as "XPRA_LOG_DIR",
#this is used by Xdummy for the Xorg log file
if "XPRA_LOG_DIR" not in os.environ:
os.environ["XPRA_LOG_DIR"] = log_dir
if opts.daemon:
from xpra.server.server_util import select_log_file, open_log_file, redirect_std_to_log
log_filename0 = osexpand(select_log_file(log_dir, opts.log_file, display_name), username, uid, gid)
logfd = open_log_file(log_filename0)
if ROOT and (uid>0 or gid>0):
try:
os.fchown(logfd, uid, gid)
except (OSError, IOError):
pass
stdout, stderr = redirect_std_to_log(logfd, *protected_fds)
try:
stderr.write("Entering daemon mode; "
+ "any further errors will be reported to:\n"
+ (" %s\n" % log_filename0))
except IOError:
#we tried our best, logging another error won't help
pass
#warn early about this:
if (starting or starting_desktop) and desktop_display and opts.notifications and not opts.dbus_launch:
print_DE_warnings()
from xpra.net.socket_util import get_network_logger, setup_local_sockets, create_sockets
sockets = create_sockets(opts, error_cb)
sanitize_env()
if POSIX:
if xrd:
os.environ["XDG_RUNTIME_DIR"] = xrd
if not OSX:
os.environ["XDG_SESSION_TYPE"] = "x11"
if not starting_desktop:
os.environ["XDG_CURRENT_DESKTOP"] = opts.wm_name
configure_imsettings_env(opts.input_method)
if display_name[0] != 'S':
os.environ["DISPLAY"] = display_name
if POSIX:
os.environ["CKCON_X11_DISPLAY"] = display_name
else:
try:
del os.environ["DISPLAY"]
except KeyError:
pass
os.environ.update(protected_env)
from xpra.log import Logger
log = Logger("server")
log("env=%s", os.environ)
UINPUT_UUID_LEN = 12
UINPUT_UUID_MIN_LEN = 12
UINPUT_UUID_MAX_LEN = 32
# Start the Xvfb server first to get the display_name if needed
odisplay_name = display_name
xvfb = None
xvfb_pid = None
uinput_uuid = None
if start_vfb:
assert not proxying and xauth_data
pixel_depth = validate_pixel_depth(opts.pixel_depth, starting_desktop)
from xpra.x11.vfb_util import start_Xvfb, check_xvfb_process
from xpra.server.server_util import has_uinput
uinput_uuid = None
if has_uinput() and opts.input_devices.lower() in ("uinput", "auto") and not shadowing:
from xpra.os_util import get_rand_chars
uinput_uuid = get_rand_chars(UINPUT_UUID_LEN)
xvfb, display_name, cleanups = start_Xvfb(opts.xvfb, pixel_depth, display_name, cwd,
uid, gid, username, xauth_data, uinput_uuid)
for f in cleanups:
add_cleanup(f)
xvfb_pid = xvfb.pid
#always update as we may now have the "real" display name:
os.environ["DISPLAY"] = display_name
os.environ["CKCON_X11_DISPLAY"] = display_name
os.environ.update(protected_env)
if display_name!=odisplay_name and pam:
pam.set_items({"XDISPLAY" : display_name})
def check_xvfb():
return check_xvfb_process(xvfb)
else:
if POSIX and clobber:
#if we're meant to be using a private XAUTHORITY file,
#make sure to point to it:
from xpra.x11.vfb_util import get_xauthority_path
xauthority = get_xauthority_path(display_name, username, uid, gid)
if os.path.exists(xauthority):
log("found XAUTHORITY=%s", xauthority)
os.environ["XAUTHORITY"] = xauthority
def check_xvfb():
return True
if POSIX and not OSX and displayfd>0:
from xpra.platform.displayfd import write_displayfd
try:
display_no = display_name[1:]
#ensure it is a string containing the number:
display_no = str(int(display_no))
log("writing display_no='%s' to displayfd=%i", display_no, displayfd)
assert write_displayfd(displayfd, display_no), "timeout"
except Exception as e:
log.error("write_displayfd failed", exc_info=True)
log.error("Error: failed to write '%s' to fd=%s", display_name, displayfd)
log.error(" %s", str(e) or type(e))
del e
if opts.daemon:
def noerr(fn, *args):
try:
fn(*args)
except Exception:
pass
log_filename1 = osexpand(select_log_file(log_dir, opts.log_file, display_name), username, uid, gid)
if log_filename0 != log_filename1:
# we now have the correct log filename, so use it:
os.rename(log_filename0, log_filename1)
if odisplay_name!=display_name:
#this may be used by scripts, let's try not to change it:
noerr(stderr.write, "Actual display used: %s\n" % display_name)
noerr(stderr.write, "Actual log file name is now: %s\n" % log_filename1)
noerr(stderr.flush)
noerr(stdout.close)
noerr(stderr.close)
#we should not be using stdout or stderr from this point:
del stdout
del stderr
if not check_xvfb():
#xvfb problem: exit now
return 1
#create devices for vfb if needed:
devices = {}
if not start_vfb and not proxying and not shadowing and envbool("XPRA_UINPUT", True):
#try to find the existing uinput uuid:
#use a subprocess to avoid polluting our current process
#with X11 connections before we get a chance to change uid
prop = "_XPRA_UINPUT_ID"
cmd = ["xprop", "-display", display_name, "-root", prop]
log("looking for '%s' on display '%s' with XAUTHORITY='%s'", prop, display_name, os.environ.get("XAUTHORITY"))
try:
code, out, err = get_status_output(cmd)
except Exception as e:
log("failed to get existing uinput id: %s", e)
del e
else:
log("Popen(%s)=%s", cmd, (code, out, err))
if code==0 and out.find("=")>0:
uinput_uuid = out.split("=", 1)[1]
log("raw uinput uuid=%s", uinput_uuid)
uinput_uuid = strtobytes(uinput_uuid.strip('\n\r"\\ '))
if uinput_uuid:
if len(uinput_uuid)>UINPUT_UUID_MAX_LEN or len(uinput_uuid)<UINPUT_UUID_MIN_LEN:
log.warn("Warning: ignoring invalid uinput id:")
log.warn(" '%s'", uinput_uuid)
uinput_uuid = None
else:
log.info("retrieved existing uinput id: %s", bytestostr(uinput_uuid))
if uinput_uuid:
devices = create_input_devices(uinput_uuid, uid)
if ROOT and (uid!=0 or gid!=0):
log("root: switching to uid=%i, gid=%i", uid, gid)
setuidgid(uid, gid)
os.environ.update({
"HOME" : home,
"USER" : username,
"LOGNAME" : username,
})
shell = get_shell_for_uid(uid)
if shell:
os.environ["SHELL"] = shell
#now we've changed uid, it is safe to honour all the env updates:
configure_env(opts.env)
os.environ.update(protected_env)
if opts.chdir:
log("chdir(%s)", opts.chdir)
os.chdir(opts.chdir)
dbus_pid, dbus_env = 0, {}
if not shadowing and POSIX and not OSX and not clobber:
no_gtk()
assert starting or starting_desktop or proxying
from xpra.server.dbus.dbus_start import start_dbus
dbus_pid, dbus_env = start_dbus(opts.dbus_launch)
if dbus_env:
os.environ.update(dbus_env)
display = None
if not proxying:
if POSIX and not OSX:
no_gtk()
if starting or starting_desktop or shadowing:
#check that we can access the X11 display:
from xpra.x11.vfb_util import verify_display_ready
if not verify_display_ready(xvfb, display_name, shadowing):
return 1
log("X11 display is ready")
no_gtk()
from xpra.x11.gtk_x11.gdk_display_source import verify_gdk_display
display = verify_gdk_display(display_name)
if not display:
return 1
log("GDK can access the display")
#on win32, this ensures that we get the correct screen size to shadow:
from xpra.platform.gui import init as gui_init
log("gui_init()")
gui_init()
#setup unix domain socket:
netlog = get_network_logger()
local_sockets = setup_local_sockets(opts.bind,
opts.socket_dir, opts.socket_dirs,
display_name, clobber,
opts.mmap_group, opts.socket_permissions,
username, uid, gid)
netlog("setting up local sockets: %s", local_sockets)
sockets += local_sockets
if POSIX and (starting or upgrading or starting_desktop or upgrading_desktop):
#all unix domain sockets:
ud_paths = [sockpath for stype, _, sockpath, _ in local_sockets if stype=="unix-domain"]
if ud_paths:
#choose one so our xdg-open override script can use to talk back to us:
if opts.forward_xdg_open:
for x in ("/usr/libexec/xpra", "/usr/lib/xpra"):
xdg_override = os.path.join(x, "xdg-open")
if os.path.exists(xdg_override):
os.environ["PATH"] = x+os.pathsep+os.environ.get("PATH", "")
os.environ["XPRA_SERVER_SOCKET"] = ud_paths[0]
break
else:
log.warn("Warning: no local server sockets,")
if opts.forward_xdg_open:
log.warn(" forward-xdg-open cannot be enabled")
log.warn(" non-embedded ssh connections will not be available")
set_server_features(opts)
if not proxying and POSIX and not OSX:
if not check_xvfb():
return 1
from xpra.x11.gtk_x11.gdk_display_source import init_gdk_display_source
if os.environ.get("NO_AT_BRIDGE") is None:
os.environ["NO_AT_BRIDGE"] = "1"
init_gdk_display_source()
#(now we can access the X11 server)
if uinput_uuid:
save_uinput_id(uinput_uuid)
if shadowing:
app = make_shadow_server()
elif proxying:
app = make_proxy_server()
else:
if starting or upgrading:
app = make_server(clobber)
else:
assert starting_desktop or upgrading_desktop
app = make_desktop_server(clobber)
app.init_virtual_devices(devices)
try:
app.exec_cwd = opts.chdir or cwd
app.display_name = display_name
app.init(opts)
app.init_sockets(sockets)
app.init_dbus(dbus_pid, dbus_env)
if not shadowing and (xvfb_pid or clobber):
app.init_display_pid(xvfb_pid)
app.original_desktop_display = desktop_display
del opts
if not app.server_ready():
return 1
app.server_init()
app.setup()
app.init_when_ready(_when_ready)
except InitException as e:
log.error("xpra server initialization error:")
log.error(" %s", e)
app.cleanup()
return 1
except Exception as e:
log.error("Error: cannot start the %s server", app.session_type, exc_info=True)
log.error(str(e))
log.info("")
app.cleanup()
return 1
try:
log("running %s", app.run)
r = app.run()
log("%s()=%s", app.run, r)
except KeyboardInterrupt:
log.info("stopping on KeyboardInterrupt")
app.cleanup()
return 0
except Exception:
log.error("server error", exc_info=True)
app.cleanup()
return -128
else:
if r>0:
r = 0
return r