xserver-xspice 0.1.1-0ubuntu3 / usr / bin / Xspice

#! /usr/bin/python

"""
Xspice

Xspice is a standard X server that is also a Spice server.

It is implemented as a module with video, mouse and keyboard drivers.

The video driver is mostly the same code as the qxl guest driver, hence
Xspice is kept in the same repository. It can also be used to debug the qxl
driver.

Xspice (this executable) will set a bunch of environment variables that are
used by spiceqxl_drv.so, and then spawn Xorg, giving it the default config file,
which can be overridden as well.
"""

import argparse
import os
import sys
import tempfile
import atexit
import time
import signal
from subprocess import Popen, PIPE

def which(x):
    if os.path.exists(x):
        return x
    for p in os.environ['PATH'].split(':'):
        candidate = os.path.join(p, x)
        if os.path.exists(candidate):
            return candidate
    return None

if 'XSPICE_ENABLE_GDB' in os.environ:
    cgdb = which('cgdb')
    if not cgdb:
        cgdb = which('gdb')
else:
    cgdb = None

def add_boolean(flag, *args, **kw):
    parser.add_argument(flag, action='store_const', const='1', default='0',
                        *args, **kw)

wan_compression_options = ['auto', 'never', 'always']
parser = argparse.ArgumentParser("Xspice",
    description="X and Spice server. example usage: Xspice --port 5900 --disable-ticketing :1.0",
    usage="Xspice [Xspice and Xorg options intermixed]",
    epilog="Any options not parsed by Xspice get passed to Xorg as is.")
parser.add_argument('--xorg', default=which('Xorg'))
parser.add_argument('--auto', action='store_true', help='Automatically create a temporary xorg.conf and start the X server')
parser.add_argument('--xsession', help='If given, will run after Xorg launch.  Should be a program like x-session-manager')
parser.add_argument('--config', default='spiceqxl.xorg.conf')
# Don't use any options that are already used by Xorg (unless we must)
# specifically, don't use -p and -s.
parser.add_argument('--port', type=int, help='standard spice port')
parser.add_argument('--exit-on-disconnect', action='store_true', help='Exit the X server when any client disconnects')
parser.add_argument('--deferred-fps', type=int, help='If given, render to a buffer and send updates only this many times per second')
parser.add_argument('--tls-port', type=int, help='spice tls port', default=0)
add_boolean('--disable-ticketing', help="do not require a client password")
add_boolean('--sasl', help="enable sasl")
parser.add_argument('--x509-dir', help="x509 directory for tls", default='.')
parser.add_argument('--cacert-file', help="ca certificate file for tls")
parser.add_argument('--x509-cert-file', help="server certificate file for tls")
parser.add_argument('--x509-key-file', help="server key file for tls")
parser.add_argument('--x509-key-password', help="key file password for tls")
parser.add_argument('--tls-ciphers')
parser.add_argument('--dh-file')
parser.add_argument('--password', help="set password required to connect to server")
parser.add_argument('--image-compression',
                    choices = ['off', 'auto_glz', 'auto_lz', 'quic',
                               'glz', 'lz'],
                    default='auto_glz', help='auto_glz by default')
parser.add_argument('--jpeg-wan-compression',
                    choices=wan_compression_options,
                    default='auto', help='auto by default')
parser.add_argument('--zlib-glz-wan-compression',
                    choices=wan_compression_options,
                    default='auto', help='auto by default')
# TODO - sound support
parser.add_argument('--streaming-video', choices=['off', 'all', 'filter'],
                    default='filter', help='filter by default')
add_boolean('--ipv4-only')
add_boolean('--ipv6-only')
parser.add_argument('--vdagent', action='store_true', dest='vdagent_enabled', default=False, help='launch vdagent & vdagentd')
parser.add_argument('--vdagent-virtio-path', default='/tmp/xspice-virtio', help='virtio socket path')
parser.add_argument('--vdagent-uinput-path', default='/tmp/xspice-uinput', help='uinput socket path')
parser.add_argument('--vdagentd-exec', default='spice-vdagentd')
parser.add_argument('--vdagent-exec', default='spice-vdagent')
parser.add_argument('--vdagent-no-launch', default=True, action='store_false', dest='vdagent_launch')
parser.add_argument('--audio-fifo-dir', default='')

#TODO
#Option "SpiceAddr" ""
#add_boolean('--agent-mouse')
#Option "EnableImageCache" "True"
#Option "EnableFallbackCache" "True"
#Option "EnableSurfaces" "True"
#Option "NumHeads" "4"
#parser.add_argument('--playback-compression', choices=['0', '1'], default='1', help='enabled by default')
#Option "SpiceDisableCopyPaste" "False"

if cgdb:
    parser.add_argument('--cgdb', action='store_true', default=False)

args, xorg_args = parser.parse_known_args(sys.argv[1:])

def agents_new_enough(args):
    if not os.path.exists(args.vdagent_exec) or not os.path.exists(args.vdagentd_exec):
        return False
    for f in [args.vdagent_exec, args.vdagentd_exec]:
        if Popen(args=[f, '-h'], stdout=PIPE).stdout.read().find('-S') == -1:
            return False
    return True

if args.vdagent_enabled:
    args.vdagent_exec = which(args.vdagent_exec)
    args.vdagentd_exec = which(args.vdagentd_exec)
    if not agents_new_enough(args):
        if args.vdagent_enabled:
            print("erorr: vdagent is not new enough to support Xspice")
            raise SystemExit
        args.vdagent_enabled = False

def tls_files(args):
    if args.tls_port == 0:
        return {}
    files = {}
    for k, var in [('ca-cert', 'cacert_file'),
                   ('server-key', 'x509_key_file'),
                   ('server-cert', 'x509_cert_file')]:
        files[k] = os.path.join(args.x509_dir, k + '.pem')
        if getattr(args, var):
            files[k] = getattr(args, var)
    return files

# XXX spice-server aborts if it can't find the certificates - avoid by checking
# ourselves. This isn't exhaustive - if the server key requires a password
# and it isn't supplied spice will still abort, and Xorg with it.
for key, filename in tls_files(args).items():
    if not os.path.exists(filename):
        print "missing %s - %s does not exist" % (key, filename)
        sys.exit(1)

def error(msg, exit_code=1):
    print "Xspice: %s" % msg
    sys.exit(exit_code)

if not args.xorg:
    error("Xorg missing")

cleanup_files = []
cleanup_processes = []

def cleanup(*args):
    for f in cleanup_files:
        if os.path.isfile(f):
            os.remove(f)
    for p in cleanup_processes:
        p.kill()
    for p in cleanup_processes:
        p.wait()
    del cleanup_processes[:]

def launch(*args, **kw):
    p = Popen(*args, **kw)
    cleanup_processes.append(p)
    return p

signal.signal(signal.SIGTERM, cleanup)
atexit.register(cleanup)

if args.auto:
    cf = tempfile.NamedTemporaryFile(prefix="Xspice-", delete=True)
    cleanup_files.append(cf.name + ".log")
    args.config = cf.name
    xorg_args = [ '-logfile', cf.name + ".log" ] + xorg_args
    if args.audio_fifo_dir:
        options = 'Option "SpicePlaybackFIFODir"  "%s"' % args.audio_fifo_dir
    else:
        options = ''
    cf.write("""
Section "Device"
    Identifier "XSPICE"
    Driver "spiceqxl"
    %(options)s
EndSection

Section "InputDevice"
    Identifier "XSPICE POINTER"
    Driver     "xspice pointer"
EndSection

Section "InputDevice"
    Identifier "XSPICE KEYBOARD"
    Driver     "xspice keyboard"
EndSection

Section "Monitor"
    Identifier    "Configured Monitor"
EndSection

Section "Screen"
    Identifier     "XSPICE Screen"
    Monitor        "Configured Monitor"
    Device         "XSPICE"
EndSection

Section "ServerLayout"
    Identifier "XSPICE Example"
    Screen "XSPICE Screen"
    InputDevice "XSPICE KEYBOARD"
    InputDevice "XSPICE POINTER"
EndSection

# Prevent udev from loading vmmouse in a vm and crashing.
Section "ServerFlags"
    Option "AutoAddDevices" "False"
EndSection


    """ % locals())
    cf.flush()

var_args = ['port', 'tls_port', 'disable_ticketing',
    'x509_dir', 'sasl', 'cacert_file', 'x509_cert_file',
    'x509_key_file', 'x509_key_password',
    'tls_ciphers', 'dh_file', 'password', 'image_compression',
    'jpeg_wan_compression', 'zlib_glz_wan_compression',
    'streaming_video', 'deferred_fps', 'exit_on_disconnect',
    'vdagent_enabled', 'vdagent_virtio_path', 'vdagent_uinput_path']

for arg in var_args:
    if getattr(args, arg):
        # The Qxl code doesn't respect booleans, so pass them as 0/1
        a = getattr(args, arg)
        if a == True:
            a = "1"
        elif a == False:
            a = "0"
        else:
            a = str(a)
        os.environ['XSPICE_' + arg.upper()] = a

display=""
for arg in xorg_args:
    if arg.startswith(":"):
        display = arg
if not display:
    print "Error: missing display on line (i.e. :3)"
    raise SystemExit
os.environ ['DISPLAY'] = display

exec_args = [args.xorg, '-config', args.config]
if cgdb and args.cgdb:
    exec_args = [cgdb, '--args'] + exec_args
    args.xorg = cgdb

# This is currently mandatory; the driver cannot survive a reset
xorg_args = [ '-noreset' ] + xorg_args


# TODO /tmp/xspice-vdagent - replace with temporary file in temporary directory
vdagentd_uds = '/tmp/xspice-vdagent'
if args.vdagent_enabled:
    for f in [vdagentd_uds, args.vdagent_virtio_path, args.vdagent_uinput_path]:
        if os.path.exists(f):
            os.unlink(f)
xorg = launch(executable=args.xorg, args=exec_args + xorg_args)
time.sleep(2)

retpid,rc = os.waitpid(xorg.pid, os.WNOHANG)
if retpid != 0:
    print "Error: X server is not running"
else:
    if args.vdagent_enabled and args.vdagent_launch:
        # XXX use systemd --user for this?
        vdagentd = launch(args=[args.vdagentd_exec, '-x', '-S', vdagentd_uds,
                          '-s', args.vdagent_virtio_path, '-u', args.vdagent_uinput_path])
        time.sleep(1)
        # TODO wait for uinput pipe open for write
        vdagent = launch(args=[args.vdagent_exec, '-x', '-s', args.vdagent_virtio_path, '-S',
                         vdagentd_uds])
    if args.xsession:
        environ = os.environ
        os.spawnlpe(os.P_NOWAIT, args.xsession, environ)

    try:
        xorg.wait()
    except KeyboardInterrupt:
        # Catch Ctrl-C as that is the common way of ending this script
        print "Keyboard Interrupt"