X-Git-Url: https://code.grnet.gr/git/snf-image-creator/blobdiff_plain/c2113d728a44d7cf42dce4f850dfc54818c5d72d..678b382b7df6a4faed4fd0474f83c006fdf9554a:/image_creator/os_type/windows.py

diff --git a/image_creator/os_type/windows.py b/image_creator/os_type/windows.py
index 4d807ea..58d98c8 100644
--- a/image_creator/os_type/windows.py
+++ b/image_creator/os_type/windows.py
@@ -36,33 +36,98 @@
 """This module hosts OS-specific code common for the various Microsoft
 Windows OSs."""
 
-from image_creator.os_type import OSBase, sysprep
-from image_creator.util import FatalError, check_guestfs_version, get_command
+from image_creator.os_type import OSBase, sysprep, add_sysprep_param
+from image_creator.util import FatalError, check_guestfs_version
+from image_creator.winexe import WinEXE, WinexeTimeout
 
 import hivex
 import tempfile
 import os
+import signal
 import time
 import random
 import string
 import subprocess
-
-kvm = get_command('kvm')
+import struct
 
 BOOT_TIMEOUT = 300
+SHUTDOWN_TIMEOUT = 120
+CONNECTION_RETRIES = 5
+
+# For more info see: http://technet.microsoft.com/en-us/library/jj612867.aspx
+KMS_CLIENT_SETUP_KEYS = {
+    "Windows 8 Professional": "NG4HW-VH26C-733KW-K6F98-J8CK4",
+    "Windows 8 Professional N": "XCVCF-2NXM9-723PB-MHCB7-2RYQQ",
+    "Windows 8 Enterprise": "32JNW-9KQ84-P47T8-D8GGY-CWCK7",
+    "Windows 8 Enterprise N": "JMNMF-RHW7P-DMY6X-RF3DR-X2BQT",
+    "Windows Server 2012 Core": "BN3D2-R7TKB-3YPBD-8DRP2-27GG4",
+    "Windows Server 2012 Core N": "8N2M2-HWPGY-7PGT9-HGDD8-GVGGY",
+    "Windows Server 2012 Core Single Language":
+    "2WN2H-YGCQR-KFX6K-CD6TF-84YXQ",
+    "Windows Server 2012 Core Country Specific":
+    "4K36P-JN4VD-GDC6V-KDT89-DYFKP",
+    "Windows Server 2012 Server Standard": "XC9B7-NBPP2-83J2H-RHMBY-92BT4",
+    "Windows Server 2012 Standard Core": "XC9B7-NBPP2-83J2H-RHMBY-92BT4",
+    "Windows Server 2012 MultiPoint Standard": "HM7DN-YVMH3-46JC3-XYTG7-CYQJJ",
+    "Windows Server 2012 MultiPoint Premium": "XNH6W-2V9GX-RGJ4K-Y8X6F-QGJ2G",
+    "Windows Server 2012 Datacenter": "48HP8-DN98B-MYWDG-T2DCC-8W83P",
+    "Windows Server 2012 Datacenter Core": "48HP8-DN98B-MYWDG-T2DCC-8W83P",
+    "Windows 7 Professional": "FJ82H-XT6CR-J8D7P-XQJJ2-GPDD4",
+    "Windows 7 Professional N": "MRPKT-YTG23-K7D7T-X2JMM-QY7MG",
+    "Windows 7 Professional E": "W82YF-2Q76Y-63HXB-FGJG9-GF7QX",
+    "Windows 7 Enterprise": "33PXH-7Y6KF-2VJC9-XBBR8-HVTHH",
+    "Windows 7 Enterprise N": "YDRBP-3D83W-TY26F-D46B2-XCKRJ",
+    "Windows 7 Enterprise E": "C29WB-22CC8-VJ326-GHFJW-H9DH4",
+    "Windows Server 2008 R2 Web": "6TPJF-RBVHG-WBW2R-86QPH-6RTM4",
+    "Windows Server 2008 R2 HPC edition": "TT8MH-CG224-D3D7Q-498W2-9QCTX",
+    "Windows Server 2008 R2 Standard": "YC6KT-GKW9T-YTKYR-T4X34-R7VHC",
+    "Windows Server 2008 R2 Enterprise": "489J6-VHDMP-X63PK-3K798-CPX3Y",
+    "Windows Server 2008 R2 Datacenter": "74YFP-3QFB3-KQT8W-PMXWJ-7M648",
+    "Windows Server 2008 R2 for Itanium-based Systems":
+    "GT63C-RJFQ3-4GMB6-BRFB9-CB83V",
+    "Windows Vista Business": "YFKBB-PQJJV-G996G-VWGXY-2V3X8",
+    "Windows Vista Business N": "HMBQG-8H2RH-C77VX-27R82-VMQBT",
+    "Windows Vista Enterprise": "VKK3X-68KWM-X2YGT-QR4M6-4BWMV",
+    "Windows Vista Enterprise N": "VTC42-BM838-43QHV-84HX6-XJXKV",
+    "Windows Web Server 2008": "WYR28-R7TFJ-3X2YQ-YCY4H-M249D",
+    "Windows Server 2008 Standard": "TM24T-X9RMF-VWXK6-X8JC9-BFGM2",
+    "Windows Server 2008 Standard without Hyper-V":
+    "W7VD6-7JFBR-RX26B-YKQ3Y-6FFFJ",
+    "Windows Server 2008 Enterprise":
+    "YQGMW-MPWTJ-34KDK-48M3W-X4Q6V",
+    "Windows Server 2008 Enterprise without Hyper-V":
+    "39BXF-X8Q23-P2WWT-38T2F-G3FPG",
+    "Windows Server 2008 HPC": "RCTX3-KWVHP-BR6TB-RB6DM-6X7HP",
+    "Windows Server 2008 Datacenter": "7M67G-PC374-GR742-YH8V4-TCBY3",
+    "Windows Server 2008 Datacenter without Hyper-V":
+    "22XQ2-VRXRG-P8D42-K34TD-G3QQC",
+    "Windows Server 2008 for Itanium-Based Systems":
+    "4DWFP-JF3DJ-B7DTH-78FJB-PDRHK"}
 
 
 class Windows(OSBase):
     """OS class for Windows"""
 
-    def needed_sysprep_params(self):
-        """Returns a list of needed sysprep parameters. Each element in the
-        list is a SysprepParam object.
-        """
-        password = self.SysprepParam(
-            'password', 'Image Administrator Password', 20, lambda x: True)
+    @add_sysprep_param('password', str, None, 'Image Administrator Password')
+    def __init__(self, image, **kargs):
+        super(Windows, self).__init__(image, **kargs)
+
+        device = self.g.part_to_dev(self.root)
+
+        self.last_part_num = self.g.part_list(device)[-1]['part_num']
+        self.last_drive = None
+        self.system_drive = None
+
+        for drive, partition in self.g.inspect_get_drive_mappings(self.root):
+            if partition == "%s%d" % (device, self.last_part_num):
+                self.last_drive = drive
+            if partition == self.root:
+                self.system_drive = drive
+
+        assert self.system_drive
 
-        return [password]
+        self.product_name = self.g.inspect_get_product_name(self.root)
+        self.syspreped = False
 
     @sysprep('Disabling IPv6 privacy extensions')
     def disable_ipv6_privacy_extensions(self):
@@ -85,10 +150,16 @@ class Windows(OSBase):
 
     @sysprep('Enabling ping responses')
     def enable_pings(self):
-        """Enable ping responces"""
+        """Enable ping responses"""
 
         self._guest_exec('netsh firewall set icmpsetting 8')
 
+    @sysprep('Disabling hibernation support')
+    def disable_hibernation(self):
+        """Disable hibernation support and remove the hibernation file"""
+
+        self._guest_exec(r'powercfg.exe /hibernate off')
+
     @sysprep('Setting the system clock to UTC')
     def utc(self):
         """Set the hardware clock to UTC"""
@@ -97,7 +168,14 @@ class Windows(OSBase):
         self._guest_exec(
             r'REG ADD %s /v RealTimeIsUniversal /t REG_DWORD /d 1 /f' % path)
 
-    @sysprep('Executing sysprep on the image (may take more that 10 minutes)')
+    @sysprep('Clearing the event logs')
+    def clear_logs(self):
+        """Clear all the event logs"""
+
+        self._guest_exec(
+            r"cmd /q /c for /f %l in ('wevtutil el') do wevtutil cl %l")
+
+    @sysprep('Executing Sysprep on the image (may take more that 10 minutes)')
     def microsoft_sysprep(self):
         """Run the Microsoft System Preparation Tool. This will remove
         system-specific data and will make the image ready to be deployed.
@@ -108,6 +186,87 @@ class Windows(OSBase):
                          r'/quiet /generalize /oobe /shutdown')
         self.syspreped = True
 
+    @sysprep('Converting the image into a KMS client', enabled=False)
+    def kms_client_setup(self):
+        """Install the appropriate KMS client setup key to the image to convert
+        it to a KMS client. Computers that are running volume licensing
+        editions of Windows 8, Windows Server 2012, Windows 7, Windows Server
+        2008 R2, Windows Vista, and Windows Server 2008 are, by default, KMS
+        clients with no additional configuration needed.
+        """
+        try:
+            setup_key = KMS_CLIENT_SETUP_KEYS[self.product_name]
+        except KeyError:
+            self.out.warn(
+                "Don't know the KMS client setup key for product: `%s'" %
+                self.product_name)
+            return
+
+        self._guest_exec(
+            r"cscript \Windows\system32\slmgr.vbs /ipk %s" % setup_key)
+
+    @sysprep('Shrinking the last filesystem')
+    def shrink(self):
+        """Shrink the last filesystem. Make sure the filesystem is defragged"""
+
+        # Query for the maximum number of reclaimable bytes
+        cmd = (
+            r'cmd /Q /V:ON /C "SET SCRIPT=%TEMP%\QUERYMAX_%RANDOM%.TXT & ' +
+            r'ECHO SELECT DISK 0 > %SCRIPT% & ' +
+            'ECHO SELECT PARTITION %d >> %%SCRIPT%% & ' % self.last_part_num +
+            r'ECHO SHRINK QUERYMAX >> %SCRIPT% & ' +
+            r'ECHO EXIT >> %SCRIPT% & ' +
+            r'DISKPART /S %SCRIPT% & ' +
+            r'IF NOT !ERRORLEVEL! EQU 0 EXIT /B 1 & ' +
+            r'DEL /Q %SCRIPT%"')
+
+        stdout, stderr, rc = self._guest_exec(cmd)
+
+        querymax = None
+        for line in stdout.splitlines():
+            # diskpart will return something like this:
+            #
+            #   The maximum number of reclaimable bytes is: xxxx MB
+            #
+            if line.find('reclaimable') >= 0:
+                querymax = line.split(':')[1].split()[0].strip()
+                assert querymax.isdigit(), \
+                    "Number of reclaimable bytes not a number"
+
+        if querymax is None:
+            FatalError("Error in shrinking! "
+                       "Couldn't find the max number of reclaimable bytes!")
+
+        querymax = int(querymax)
+        # From ntfsresize:
+        # Practically the smallest shrunken size generally is at around
+        # "used space" + (20-200 MB). Please also take into account that
+        # Windows might need about 50-100 MB free space left to boot safely.
+        # I'll give 100MB extra space just to be sure
+        querymax -= 100
+
+        if querymax < 0:
+            self.out.warn("Not enought available space to shrink the image!")
+            return
+
+        self.out.output("\tReclaiming %dMB ..." % querymax)
+
+        cmd = (
+            r'cmd /Q /V:ON /C "SET SCRIPT=%TEMP%\QUERYMAX_%RANDOM%.TXT & ' +
+            r'ECHO SELECT DISK 0 > %SCRIPT% & ' +
+            'ECHO SELECT PARTITION %d >> %%SCRIPT%% & ' % self.last_part_num +
+            'ECHO SHRINK DESIRED=%d >> %%SCRIPT%% & ' % querymax +
+            r'ECHO EXIT >> %SCRIPT% & ' +
+            r'DISKPART /S %SCRIPT% & ' +
+            r'IF NOT !ERRORLEVEL! EQU 0 EXIT /B 1 & ' +
+            r'DEL /Q %SCRIPT%"')
+
+        stdout, stderr, rc = self._guest_exec(cmd)
+
+        for line in stdout.splitlines():
+            if line.find('shrunk') >= 0:
+                self.out.output(line)
+
     def do_sysprep(self):
         """Prepare system for image creation."""
 
@@ -115,9 +274,9 @@ class Windows(OSBase):
             raise FatalError("Image is already syspreped!")
 
         txt = "System preparation parameter: `%s' is needed but missing!"
-        for param in self.needed_sysprep_params():
-            if param[0] not in self.sysprep_params:
-                raise FatalError(txt % param[0])
+        for name, param in self.needed_sysprep_params.items():
+            if name not in self.sysprep_params:
+                raise FatalError(txt % param)
 
         self.mount(readonly=False)
         try:
@@ -140,9 +299,9 @@ class Windows(OSBase):
         # guestfs_shutdown which is the prefered way to shutdown the backend
         # process was introduced in version 1.19.16
         if check_guestfs_version(self.g, 1, 19, 16) >= 0:
-            ret = self.g.shutdown()
+            self.g.shutdown()
         else:
-            ret = self.g.kill_subprocess()
+            self.g.kill_subprocess()
 
         self.out.success('done')
 
@@ -152,29 +311,38 @@ class Windows(OSBase):
             self.out.output("Starting windows VM ...", False)
             monitorfd, monitor = tempfile.mkstemp()
             os.close(monitorfd)
-            vm, display = self._create_vm(monitor)
-            self.out.success("started (console on vnc display: %d)." % display)
+            vm = _VM(self.image.device, monitor)
+            self.out.success("started (console on vnc display: %d)." %
+                             vm.display)
 
             self.out.output("Waiting for OS to boot ...", False)
-            if not self._wait_on_file(monitor, token):
-                raise FatalError("Windows booting timed out.")
-            else:
-                self.out.success('done')
+            self._wait_vm_boot(vm, monitor, token)
+            self.out.success('done')
+
+            self.out.output("Checking connectivity to the VM ...", False)
+            self._check_connectivity()
+            self.out.success('done')
 
             self.out.output("Disabling automatic logon ...", False)
             self._disable_autologon()
             self.out.success('done')
 
-            self.out.output('Preparing system from image creation:')
+            self.out.output('Preparing system for image creation:')
 
             tasks = self.list_syspreps()
-            enabled = filter(lambda x: x.enabled, tasks)
-
+            enabled = [task for task in tasks if task.enabled]
             size = len(enabled)
 
+            # Make sure shrink runs in the end, before ms sysprep
+            enabled = [task for task in enabled if
+                       self.sysprep_info(task).name != 'shrink']
+
+            if len(enabled) != size:
+                enabled.append(self.shrink)
+
             # Make sure the ms sysprep is the last task to run if it is enabled
-            enabled = filter(
-                lambda x: x.im_func.func_name != 'microsoft_sysprep', enabled)
+            enabled = [task for task in enabled if
+                       self.sysprep_info(task).name != 'microsoft-sysprep']
 
             ms_sysprep_enabled = False
             if len(enabled) != size:
@@ -194,75 +362,49 @@ class Windows(OSBase):
             self.out.success("done")
 
             self.out.output("Waiting for windows to shut down ...", False)
-            vm.wait()
+            vm.wait(SHUTDOWN_TIMEOUT)
             self.out.success("done")
         finally:
             if monitor is not None:
                 os.unlink(monitor)
 
-            if vm is not None:
-                self._destroy_vm(vm)
-
-            self.out.output("Relaunching helper VM (may take a while) ...",
-                            False)
-            self.g.launch()
-            self.out.success('done')
-
-            self.mount(readonly=False)
             try:
-                if disabled_uac:
-                    self._update_uac_remote_setting(0)
-
-                self._update_firewalls(*firewall_states)
+                if vm is not None:
+                    self.out.output("Destroying windows VM ...", False)
+                    vm.destroy()
+                    self.out.success("done")
             finally:
-                self.umount()
-
-    def _create_vm(self, monitor):
-        """Create a VM with the image attached as the disk
-
-            monitor: a file to be used to monitor when the OS is up
-        """
-
-        def random_mac():
-            mac = [0x00, 0x16, 0x3e,
-                   random.randint(0x00, 0x7f),
-                   random.randint(0x00, 0xff),
-                   random.randint(0x00, 0xff)]
-
-            return ':'.join(map(lambda x: "%02x" % x, mac))
-
-        # Use ganeti's VNC port range for a random vnc port
-        vnc_port = random.randint(11000, 14999)
-        display = vnc_port - 5900
-
-        vm = kvm('-smp', '1', '-m', '1024', '-drive',
-                 'file=%s,format=raw,cache=none,if=virtio' % self.image.device,
-                 '-netdev', 'type=user,hostfwd=tcp::445-:445,id=netdev0',
-                 '-device', 'virtio-net-pci,mac=%s,netdev=netdev0' %
-                 random_mac(), '-vnc', ':%d' % display, '-serial',
-                 'file:%s' % monitor, _bg=True)
+                self.out.output("Relaunching helper VM (may take a while) ...",
+                                False)
+                self.g.launch()
+                self.out.success('done')
 
-        return vm, display
+                self.mount(readonly=False)
+                try:
+                    if disabled_uac:
+                        self._update_uac_remote_setting(0)
 
-    def _destroy_vm(self, vm):
-        """Destroy a VM previously created by _create_vm"""
-        if vm.process.alive:
-            vm.terminate()
+                    self._update_firewalls(*firewall_states)
+                finally:
+                    self.umount()
 
     def _shutdown(self):
         """Shuts down the windows VM"""
         self._guest_exec(r'shutdown /s /t 5')
 
-    def _wait_on_file(self, fname, msg):
-        """Wait until a message appears on a file"""
+    def _wait_vm_boot(self, vm, fname, msg):
+        """Wait until a message appears on a file or the vm process dies"""
 
-        for i in range(BOOT_TIMEOUT):
+        for _ in range(BOOT_TIMEOUT):
             time.sleep(1)
             with open(fname) as f:
                 for line in f:
                     if line.startswith(msg):
                         return True
-        return False
+            if not vm.isalive():
+                raise FatalError("Windows VM died unexpectedly!")
+
+        raise FatalError("Windows VM booting timed out!")
 
     def _disable_autologon(self):
         """Disable automatic logon on the windows image"""
@@ -281,9 +423,9 @@ class Windows(OSBase):
         path = "%s/system32/config/%s" % (systemroot, regfile)
         try:
             path = self.g.case_sensitive_path(path)
-        except RuntimeError as e:
+        except RuntimeError as error:
             raise FatalError("Unable to retrieve registry file: %s. Reason: %s"
-                             % (regfile, str(e)))
+                             % (regfile, str(error)))
         return path
 
     def _enable_os_monitor(self):
@@ -352,6 +494,14 @@ class Windows(OSBase):
             h.node_set_value(runonce,
                              {'key': "BootMonitor", 't': 1, 'value': value})
 
+            value = (
+                r'REG ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion'
+                r'\policies\system /v LocalAccountTokenFilterPolicy'
+                r' /t REG_DWORD /d 1 /f').encode('utf-16le')
+
+            h.node_set_value(runonce,
+                             {'key': "UpdateRegistry", 't': 1, 'value': value})
+
             h.commit(None)
 
             self.g.upload(software, path)
@@ -407,9 +557,9 @@ class Windows(OSBase):
                 assert h.value_type(old_value)[1] == 4
                 old_values.append(h.value_dword(old_value))
 
-                new_value = '\x00' if new_values.pop(0) == 0 else '\x01'
-                h.node_set_value(node, {'key': 'EnableFirewall', 't': 4L,
-                                        'value': '%s\x00\x00\x00' % new_value})
+                h.node_set_value(
+                    node, {'key': 'EnableFirewall', 't': 4L,
+                           'value': struct.pack("<I", new_values.pop(0))})
 
             h.commit(None)
             self.g.upload(system, path)
@@ -462,9 +612,8 @@ class Windows(OSBase):
             elif value == 0:
                 return False
 
-            new_value = {
-                'key': "LocalAccountTokenFilterPolicy", 't': 4L,
-                'value': '%s\x00\x00\x00' % '\x00' if value == 0 else '\x01'}
+            new_value = {'key': "LocalAccountTokenFilterPolicy", 't': 4L,
+                         'value': struct.pack("<I", value)}
 
             h.node_set_value(key, new_value)
             h.commit(None)
@@ -483,45 +632,173 @@ class Windows(OSBase):
 
     def _get_users(self):
         """Returns a list of users found in the images"""
-        path = self._registry_file_path('SAM')
         samfd, sam = tempfile.mkstemp()
         try:
             os.close(samfd)
-            self.g.download(path, sam)
+            self.g.download(self._registry_file_path('SAM'), sam)
 
             h = hivex.Hivex(sam)
 
-            key = h.root()
+            # Navigate to /SAM/Domains/Account/Users
+            users_node = h.root()
+            for child in ('SAM', 'Domains', 'Account', 'Users'):
+                users_node = h.node_get_child(users_node, child)
+
             # Navigate to /SAM/Domains/Account/Users/Names
-            for child in ('SAM', 'Domains', 'Account', 'Users', 'Names'):
-                key = h.node_get_child(key, child)
+            names_node = h.node_get_child(users_node, 'Names')
 
-            users = [h.node_name(x) for x in h.node_children(key)]
+            # HKEY_LOCAL_MACHINE\SAM\SAM\Domains\Account\Users\%RID%
+            # HKEY_LOCAL_MACHINE\SAM\SAM\Domains\Account\Users\Names\%Username%
+            #
+            # The RID (relative identifier) of each user is stored as the type!
+            # (not the value) of the default key of the node under Names whose
+            # name is the user's username. Under the RID node, there in a F
+            # value that contains information about this user account.
+            #
+            # See sam.h of the chntpw project on how to translate the F value
+            # of an account in the registry. Bytes 56 & 57 are the account type
+            # and status flags. The first bit is the 'account disabled' bit
+            disabled = lambda f: int(f[56].encode('hex'), 16) & 0x01
+
+            users = []
+            for user_node in h.node_children(names_node):
+                username = h.node_name(user_node)
+                rid = h.value_type(h.node_get_value(user_node, ""))[0]
+                # if RID is 500 (=0x1f4), the corresponding node name under
+                # Users is '000001F4'
+                key = ("%8.x" % rid).replace(' ', '0').upper()
+                rid_node = h.node_get_child(users_node, key)
+                f_value = h.value_value(h.node_get_value(rid_node, 'F'))[1]
+
+                if disabled(f_value):
+                    self.out.warn("Found disabled `%s' account!" % username)
+                    continue
+
+                users.append(username)
 
         finally:
             os.unlink(sam)
 
         # Filter out the guest account
-        return filter(lambda x: x != "Guest", users)
+        return users
+
+    def _check_connectivity(self):
+        """Check if winexe works on the Windows VM"""
+
+        passwd = self.sysprep_params['password']
+        winexe = WinEXE('Administrator', passwd, 'localhost')
+        winexe.uninstall().debug(9)
+
+        for i in range(CONNECTION_RETRIES):
+            (stdout, stderr, rc) = winexe.run('cmd /C')
+            if rc == 0:
+                return True
+            log = tempfile.NamedTemporaryFile(delete=False)
+            try:
+                log.file.write(stdout)
+            finally:
+                log.close()
+            self.out.output("failed! See: `%s' for the full output" % log.name)
+            if i < CONNECTION_RETRIES - 1:
+                self.out.output("Retrying ...", False)
+        raise FatalError("Connection to the VM failed after %d retries" %
+                         CONNECTION_RETRIES)
 
     def _guest_exec(self, command, fatal=True):
         """Execute a command on a windows VM"""
 
-        user = "Administrator%" + self.sysprep_params['password']
-        addr = 'localhost'
-        runas = '--runas=%s' % user
-        winexe = subprocess.Popen(
-            ['winexe', '-U', user, "//%s" % addr, runas, command],
-            stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        passwd = self.sysprep_params['password']
 
-        stdout, stderr = winexe.communicate()
-        rc = winexe.poll()
+        winexe = WinEXE('Administrator', passwd, 'localhost')
+        winexe.runas('Administrator', passwd).uninstall()
+
+        try:
+            (stdout, stderr, rc) = winexe.run(command)
+        except WinexeTimeout:
+            FatalError("Command: `%s' timeout out." % command)
 
         if rc != 0 and fatal:
             reason = stderr if len(stderr) else stdout
-            raise FatalError("Command: `%s' failed. Reason: %s" %
-                             (command, reason))
+            self.out.output("Command: `%s' failed (rc=%d). Reason: %s" %
+                            (command, rc, reason))
+            raise FatalError("Command: `%s' failed (rc=%d). Reason: %s" %
+                             (command, rc, reason))
 
         return (stdout, stderr, rc)
 
+
+class _VM(object):
+    """Windows Virtual Machine"""
+    def __init__(self, disk, serial):
+        """Create _VM instance
+
+            disk: VM's hard disk
+            serial: File to save the output of the serial port
+        """
+
+        self.disk = disk
+        self.serial = serial
+
+        def random_mac():
+            """creates a random mac address"""
+            mac = [0x00, 0x16, 0x3e,
+                   random.randint(0x00, 0x7f),
+                   random.randint(0x00, 0xff),
+                   random.randint(0x00, 0xff)]
+
+            return ':'.join(['%02x' % x for x in mac])
+
+        # Use ganeti's VNC port range for a random vnc port
+        self.display = random.randint(11000, 14999) - 5900
+
+        args = [
+            'kvm', '-smp', '1', '-m', '1024', '-drive',
+            'file=%s,format=raw,cache=unsafe,if=virtio' % self.disk,
+            '-netdev', 'type=user,hostfwd=tcp::445-:445,id=netdev0',
+            '-device', 'virtio-net-pci,mac=%s,netdev=netdev0' % random_mac(),
+            '-vnc', ':%d' % self.display, '-serial', 'file:%s' % self.serial,
+            '-monitor', 'stdio']
+
+        self.process = subprocess.Popen(args, stdin=subprocess.PIPE,
+                                        stdout=subprocess.PIPE)
+
+    def isalive(self):
+        """Check if the VM is still alive"""
+        return self.process.poll() is None
+
+    def destroy(self):
+        """Destroy the VM"""
+
+        if not self.isalive():
+            return
+
+        def handler(signum, frame):
+            self.process.terminate()
+            time.sleep(1)
+            if self.isalive():
+                self.process.kill()
+            self.process.wait()
+            raise FatalError("VM destroy timed-out")
+
+        signal.signal(signal.SIGALRM, handler)
+
+        signal.alarm(SHUTDOWN_TIMEOUT)
+        self.process.communicate(input="system_powerdown\n")
+        signal.alarm(0)
+
+    def wait(self, timeout=0):
+        """Wait for the VM to terminate"""
+
+        def handler(signum, frame):
+            self.destroy()
+            raise FatalError("VM wait timed-out.")
+
+        signal.signal(signal.SIGALRM, handler)
+
+        signal.alarm(timeout)
+        stdout, stderr = self.process.communicate()
+        signal.alarm(0)
+
+        return (stdout, stderr, self.process.poll())
+
 # vim: set sta sts=4 shiftwidth=4 sw=4 et ai :