Use ip script to add/remove Openvpn tap driver in the Cygwin.

windows/scripts/ip

@@ -291,13 +291,20 @@ function prefix_to_netmask()
     echo $result
 }
 
+#
+# Parameter:
+#     ifname: interface name or guid name
+#
+# If ifname is guid name, return the corresponding connection name,
+# otherwise return the original ifname.
+#
 function format_interface_name()
 {
     if [[ "$1" == "" ]]; then
         return 1
     fi
 
-    local guid=$1
+    local guid="$1"    
     if ! [[ "${guid:0:1}" == "{" ]] ; then
         echo $1
     else
@@ -306,6 +313,157 @@ function format_interface_name()
     fi
 }
 
+#
+# Parameter:
+#     ifname: connection name
+#
+# Add a TAP-WINDOWS driver of Openvpn, then rename the connection name
+# as ifname.
+#
+function install_tap_driver()
+{
+    local FILENAME="/etc/openvpn/driver/OemWin2k.inf"
+    local DEVFILE=$(cygpath -w $FILENAME)
+    local DEVCON=$(which devcon.exe)
+    local HWID=tap0901
+    local CHECKSCRIPT=$(cygpath -m /etc/openvpn/check_driver_signing_dialog.vbs)
+    local CSCRIPT=$(which cscript)
+    local GETSCRIPT=$(cygpath -m /etc/openvpn/get_last_connection.vbs)
+
+    if [[ ! -f $FILENAME ]] ; then
+        echo "Error: no TAP-WINDOWS driver inf file found"
+        return 1
+    fi
+
+    if [[ ! -x $DEVCON ]] ; then
+        echo "Error: no devcon.exe found"
+        return 1
+    fi
+
+    if [[ ! -x $CSCRIPT ]] ; then
+        echo "Error: no cscript.exe found"
+        return 1
+    fi
+
+    if ! [[ -f $CHECKSCRIPT ]] ; then
+        cat <<EOF > $CHECKSCRIPT
+  Set oShell = CreateObject("WScript.Shell")
+  Do
+    If oShell.AppActivate("Hardware Installation") Then
+       WScript.Sleep 1000
+       oShell.SendKeys "%C"
+       WScript.Sleep 2000
+    End If
+    WScript.Sleep 1000
+  Loop While True
+EOF
+    fi
+
+    # install driver
+    $CSCRIPT $CHECKSCRIPT > /dev/null &
+    local sid=$!
+    $DEVCON install $DEVFILE $HWID
+    kill $sid
+
+    # rename the connection name
+    if [[ ! "$1" == "" ]] ; then
+
+        if [[ ! -f $GETSCRIPT ]] ; then
+            cat <<EOF > $GETSCRIPT
+  strComputer = "."
+  strPrefix = "Local Area Connection"
+  Set objWMIService = GetObject("winmgmts:\\\\" & strComputer & "\root\CIMV2")
+  Set colItems = objWMIService.ExecQuery( _
+      "SELECT NetConnectionID FROM Win32_NetworkAdapter WHERE " & _
+             "NetConnectionID Like '" & strPrefix & "%'", _
+      "WQL", 48)
+  strLastConnectionName = ""
+  i = -1
+  k = Len(strPrefix)
+  For Each objItem In colItems
+    s = Right(objItem.NetConnectionID, Len(objItem.NetConnectionID) - k)
+    If s = "" Then
+      j = 0
+    Else
+      j = Int(s)
+    End If
+    If j > i Then
+      strLastConnectionName = objItem.NetConnectionID
+      i = j
+    End If
+  Next
+  WScript.StdOut.Write(strLastConnectionName)
+  WScript.Quit(0)
+EOF
+        fi
+        local OLDNAME=$($CSCRIPT //Nologo $GETSCRIPT)
+        if (( $? == 0 )) ; then
+            netsh interface set interface name="$OLDNAME" newname="$1"
+        fi
+    fi
+}
+
+#
+# Parameter:
+#     ifname: connection name
+#
+# Remove a TAP-WINDOWS driver of Openvpn which connection name equals
+# ifname.
+#
+function uninstall_tap_driver()
+{
+    local DEVCON=$(which devcon.exe)
+    local CSCRIPT=$(which cscript.exe)
+    local GETSCRIPT=$(cygpath -m /etc/openvpn/get_pnpid_connection.vbs)
+    
+    if [[ "$1" == "" ]] ; then
+        echo "Error: missing connection name"
+        return 1
+    fi
+
+    local IFNAME=$1
+
+    if [[ ! -x $DEVCON ]] ; then
+        echo "Error: no devcon.exe found"
+        return 1
+    fi
+
+    if [[ ! -x $CSCRIPT ]] ; then
+        echo "Error: no cscript.exe found"
+        return 1
+    fi
+
+    if [[ ! -f $GETSCRIPT ]] ; then
+            cat <<EOF > $GETSCRIPT
+  If WScript.Arguments.Count < 1 Then
+    WScript.Echo "Error: missing paramter connection name"
+    WScript.Quit(1)
+  End If
+
+  strComputer = "."
+  strDriverName = "TAP-Windows Adapter V9"
+  strConnectionName = WScript.Arguments(0)
+  Set objWMIService = GetObject("winmgmts:\\\\" & strComputer & "\root\CIMV2")
+  Set colItems = objWMIService.ExecQuery(_
+      "SELECT PNPDeviceID FROM Win32_NetworkAdapter WHERE Name='" _
+      & strDriverName & "' AND NetConnectionID='" & strConnectionName & "'", _
+      "WQL", 48)
+  strDeviceID = ""
+  For Each objItem In colItems
+     strDeviceID = objItem.PNPDeviceID
+  Next
+  WScript.StdOut.Write(strDeviceId)
+  WScript.Quit(0)
+EOF
+    fi
+
+    local PNPDEVICEID=$($CSCRIPT //Nologo "$GETSCRIPT" "$IFNAME")
+    if (( $? == 0 )) ; then
+        $DEVCON remove =Net "@$PNPDEVICEID"
+        return $?
+    fi
+}
+
 orig_cmd="$0 $*"
 opt_family=
 opt_statistics=0
@@ -338,12 +496,8 @@ while [[ "$1" != "" ]] && [[ "$object" == "" ]] ; do
         -s | -stats | -statistics)
             let opt_statistics+=1
             ;;
-        tuntap)
-            echo $orig_cmd
-            exit 0
-            ;;
         link | addr | addrlabel | route | rule | neigh | tunnel | \
-        maddr | mroute | monitor)
+        maddr | mroute | monitor | tuntap)
             object=$1
             ;;
         *) echo Warning: unsupport options "$1"
@@ -402,7 +556,7 @@ elif [[ $object == "addr" ]] ; then
     while [[ "$1" != "" ]] ; do
         case $1 in
             dev)
-                dev=\"$(format_interface_name $2)\"
+                dev=$(format_interface_name "$2")
                 shift
                 ;;
             *) echo Warning: unsupport parameter "$1"
@@ -411,7 +565,7 @@ elif [[ $object == "addr" ]] ; then
         shift
     done
 
-    ipcmd="$ipcmd $dev $address"
+    ipcmd="$ipcmd \"$dev\" $address"
 
 elif [[ $object == "addrlabel" ]] ; then
 
@@ -520,7 +674,7 @@ elif [[ $object == "route" ]] ; then
     while [[ "$1" != "" ]] ; do
         case $1 in
             dev)
-                interface=\"$(format_interface_name $2)\"
+                interface=$(format_interface_name "$2")
                 shift
                 ;;
             proto)
@@ -565,8 +719,37 @@ elif [[ $object == "route" ]] ; then
         fi
     fi
 
-    ipcmd="$ipcmd $prefix $interface $nexthop"
+    ipcmd="$ipcmd $prefix \"$interface\" $nexthop"
+
+elif [[ $object == "tuntap" ]] ; then
 
+    while [[ "$1" != "" ]] ; do
+        case $1 in
+            dev)
+                dev=$(format_interface_name "$2")
+                shift
+                ;;
+            mode)
+                mode=$2
+                shift
+                ;;
+            *) echo Warning: unsupport parameter "$1"
+        esac
+
+        shift
+    done
+
+    if [[ "$command" == "add" ]] ; then
+        install_tap_driver "$dev"
+        exit $?
+    elif [[ "$command" == "del" ]] ; then
+        uninstall_tap_driver "$dev"
+        exit $?
+    else
+        echo $orig_cmd
+        echo "Error: unsupported command \"$command\" for tuntap"
+        exit 1
+    fi
 # elif [[ $object == "rule" ]] ; then
 #     echo "Error: unsupported ip object \"$object\" in the Cygwin"
 #     exit 1
@@ -593,4 +776,3 @@ fi
 
 echo "Mapped to: $ipcmd"
 $ipcmd
-