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Click the Web Services on the Local Machine link A list of the Web services on the local machine is listed here Find the link with the URL listed as http://localhost/SimpleWebService/Serviceasmx The Services column lists Service Click the URL The Service default page appears as it did in the browser previously Change the Web Reference Name to SimpleWebService and click the Add Reference button This is the same as adding a Web Reference to a VB or C# application After the Add Web Reference window closes, click the InvokeWebService activity and view the properties Change the name to InvokeSimpleWebService Click the MethodName property and choose IsUser from the drop-down Each InvokeWebService activity allows you to interact with one Web method exposed by the Web service Once you choose IsUser, the (ReturnValue) and UserName properties appear under Parameters, as shown in Figure 6-1.

From Listing 8-3, you can find out that someone is repeatedly trying to log in as the local root user If you see this pattern, consider talking to your users and asking if anyone of them is trying to log in as root Similar entries will show up if an attacker tries to find a way in to your system remotely using telnet or ssh by looking for a system user with a weak password Listing 8-4 shows a remote attacker with an IP address of 192168110 using ssh to randomly find valid users and crack in to the Linux server at 192168113 using the command grep ssh /var/log/secure The Linux server has a valid user called ging as a start Listing 8-4 An Attacker Attempting to Break into the System by Guessing Usernames Aug 19 09:02:12 localhost sshd[4771]: Invalid user chivas from 192.

We can now declare our Direction property, using the enumeration instead of an integer. Example 3-22 shows the property to add to the Plane class.

public DirectionOfApproach Direction { get; set; }

There are some optional features we can use in an enum declaration. Example 3-23 uses these, and they provide some insight into how enum types work.

168110 Aug 19 09:02:12 localhost sshd[4772]: input_userauth_request: invalid user chivas Aug 19 09:02:15 localhost sshd[4771]: Failed none for invalid user chivas from 192168110 port 48852 ssh2 Aug 19 09:02:15 localhost sshd[4771]: Failed password for invalid user chivas from 192168110 port 48852 ssh2 Aug 19 09:02:15 localhost sshd[4771]: Failed password for invalid user chivas from 192168110 port 48852 ssh2 Aug 19 09:02:15 localhost sshd[4772]: Connection closed by 192168110 Aug 19 09:02:18 localhost sshd[4774]: Invalid user frank from 192168110 Aug 19 09:02:19 localhost sshd[4775]: input_userauth_request: invalid user frank Aug 19 09:02:20 localhost sshd[4774]: Failed none for invalid user frank from 192168110 port 48854 ssh2 Aug 19 09:02:21 localhost sshd[4774]: Failed password for invalid user frank from 1921681.

enum DirectionOfApproach : int { Approaching = 0, Leaving = 1 }

In this declaration, we have explicitly specified the governing type for the enumeration. This is the type that stores the individual values for an enumeration, and we specify it with a colon and the type name. By default, it uses an int (exactly as we did in our original const-based implementation of this property), so we ve not actually changed anything here; we re just being more explicit. The governing type must be one of the built-in integer types: byte, sbyte, short, ushort, uint, long, or ulong. Example 3-23 also specifies the numbers to use for each named value. As it happens, if you don t provide these numbers, the first member is assigned the value 0, and we count off sequentially after that, so again, this example hasn t changed anything, it s just showing the values explicitly. We could, if we wanted, specify any value for any particular member. Maybe we start from 10 and go up in powers of 2. And we re also free to define duplicates, giving the same value several different names. (That might not be useful, but C# won t stop you.) We normally leave all these explicit specifiers off, and accept the defaults. However, the sidebar on the next page describes a scenario in which you would need to control the numbers.

10 port 48854 ssh2 Aug 19 09:02:21 localhost sshd[4774]: Failed password for invalid user frank from 192168110 port 48854 ssh2 Aug 19 09:02:21 localhost sshd[4775]: Connection closed by 192168110 Aug 19 09:02:26 localhost sshd[4776]: Failed password for ging from 192168110 port 48855 ssh2 Aug 19 09:02:26 localhost sshd[4776]: Failed password for ging.

Bit Fields with [Flags]