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The first step, of course, is to find a device that s utilizing Bluetooth. This can be done a number of different ways with a number of different tools. The first method is to find a device running Bluetooth that is in discoverable mode. Discoverable mode means that the device can be seen easily by any other device that s utilizing Bluetooth. Having a device always in discoverable mode certainly makes it easy for other devices to connect to that device, and the end user may see it as an advantage. From a security perspective, though, having a device be in discoverable mode constantly is a huge vulnerability. It is essentially advertising the device to the world. As you have learned from the previous chapters, stealth is a huge security advantage. Consequently, many newer Bluetooth-enabled phones come with Bluetooth disabled and with discoverable mode disabled. For example, Figure 9.2 shows the interface for a new Motorola Razr. By default, the Bluetooth interface was disabled and the device was not in discoverable mode. The end user has to specifically go in and click the Find Me menu option, at which time the device will become discoverable for only 60 seconds. This is a very nice security feature.

Interface: wsdlDate.SimpleDate Implementation: wsdlDate.SimpleDateImpl Client Client Application Server Remote Object Implementation

The first member of any COM object is pointer to the vtable for that class of object The vtable itself is a list of function pointers

Network Interface: wsdlDate.ws.SimpleDate Implementation: wsdlDate.ws.WsdlDateSoapBindingImpl Interface: wsdlDate.ws.SimpleDate Implementation: wsdlDate.ws.WsdlDateSoapBindingStub

There are some easy-to-use tools available to find Bluetooth devices that are in discoverable mode. GhettoTooth is a very simple tool that will scan for Bluetooth devices and provide their hardware ID and name. Figure 9.3 shows GhettoTooth finding a Motorola Razr that was in discoverable mode. BTScanner is a Linux tool that will scan for Bluetooth devices. Figures 9.4 and 9.5 show the BTScanner tool finding a Motorola Razr that s in discoverable mode.

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To create these files automatically, we have to invoke the WSDL2Java tool:

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Additionally, Network Chemistry makes a Windows-based Bluetooth scanner called BlueScanner that s available for free. Its graphical interface is easy to understand, plus the application can log everything it finds. Another neat feature is that Network Chemistry includes actual data that was collected in Las Vegas during July 2005. This data should be an eye-opener for all enterprise IT and security departments. Figures 9.6 and 9.7 show BlueScanner with some of that data.

On the client side, a simpler client than the dynamic invocation client from the previous section can be implemented that abstracts from most

IDispatch binding is also a vtable-based mechanism, but the vtable entries called by VB are not the target functions The vtable entries used to IDispatch bind are GetlDsOfNames and Invoke on the IDispatch interface These functions reside at the vtable offsets of 20 and 24 bytes, respectively IDispatch uses an ID base system, where each function has a long numeric identifier, known as a MEMBERID or DISPID Invoke also takes an INVOKEKIND parameter, which controls how the function is called: as a normal function (with the function to the right of an equals sign, or without getting a return value), as a Property Get (which is like a function, except you can't ignore the return value), as a Property Let (the function name is to the left of the equals sign), or as a Property Set (the function name is to the left of the equals sign in a Set statement) The ID and INVOKEKIND uniquely identify the function The Invoke function also takes an array of parameters stored in a Variant array in reverse order, the return type as an output Variant, and a variety of parameters for returning error information Clearly, it is a lot more work to bind with the generic Invoke function than with a direct vtable call There are actually two types of IDispatch binding The first type, called "early-id binding," occurs when the compiler has type information about the object from a type library, but the object does not support a vtable beyond the IDispatch entries In such a case, the compiler can look up the ID at compile time, verify the parameters being passed to the function, and provide IntelliSense lists and function descriptions In fact, early-id binding is indistinguishable from vtable binding from within the VB IDE You have to examine the typelib to determine whether you're vtable bound Currently, the only common objects that don't support vtable binding are custom controls on a form, which we'll look at later in this chapter In the second type of IDispatch binding, called "late binding," the compiler can't retrieve information about the function at compile time In practice, this happens when the variable or expression you're binding to returns Variant or Object (this is Object with a capital 0, meaning As Object, as opposed to "an object type," which means any object type) When you're coding, it is obvious when you're adding a late-bound call to your code: You get no IntelliSense information Unlike early-id binding, late binding requires a name lookup as well as a call to the Invoke function A name is translated into an ID using the.

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Web Services Technology Projection of the distribution details. The following client code instantiates the factory, creates a CLIENT PROXY, and performs two remote invocations:

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