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In most typical console applications, standard input refers to the input the program will get from the keyboard. Standard output is normally written to the screen. A CGI application reads from standard input and writes to standard output. In most operating systems, standard input and standard output can be redirected, and that is exactly what happens to a program run as a CGI program. The Good News About CGI A CGI program can do virtually anything you can imagine. You can use a CGI program to access databases, read files, work with the registry, and everything else that a Win32 program can normally do. The example application in Listing 1-1 uses C/C++, but there s nothing to prevent you from using any other programming language or development environment to create a console application that can read from standard input and write to standard output. PERL is often used in the UNIX world to create CGI programs, and in the Win32 world, Borland s Delphi offers explicit support for CGI applications, providing classes to manage reading from and writing to standard input and standard output. If you teach a group of programmers who are experienced in creating text-mode programs a little bit about HTML, it s likely that they will be able to create halfway decent

Interface Name: VPN_Chicago Connection Type: Connect Using Virtual Private Networking (VPN) VPN Type: Point-to-Point Tunneling Protocol (PPTP) Destination Address: 131.107.0.1 Protocols And Security: The Route IP Packets On This Interface check box is selected.

This method redirects an authenticated user back to the originally requested URL. Call this method after verifying a user s credentials with the Authenticate method. You must pass this method a string and a Boolean value. The string should uniquely identify the user, and the method uses the string to generate a cookie. The Boolean value, if true, allows the browser to use the same cookie across multiple browser sessions. Generally, this unique piece of information should be the user s user name.

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RedirectFromLoginPage RenewTicketifOld This method conditionally updates the sliding expiration on a FormsAuthenticationTicket object. setAuthCookie This method creates an authentication ticket and attaches it to the cookie s collection of the outgoing response. It does not perform a redirect. signOut

The logon controls discussed previously use the methods of the System.Web.Security.Membership class to implement their functionality. This is, for the most part, abstracted from developers. However, there are many cases in which you might want to use these methods yourself. For instance, you might want to create your own custom user interface outside of the logon controls, intercept logon control events, and implement other security-related code on your site. In each case, you use the Membership class. It provides capabilities that allow you to add, remove, and find users. The following are the important static methods in this class, along with each method s capability:

To make all locations on the Chicago network reachable, the following static route is created:

CreateUser This method adds a user to the database. Use this method if you create a custom page to enable users or administrators to add new accounts. DeleteUser This method removes a user from the data store. Use this method if you create custom user management tools. FindUsersbyEmail

CGI programs CGI programs are easy to test, and the code/test/debug cycle is straightforward You can simply have the compiler deposit the executable file in the correct directory, test the application in the browser, and then go back to the editor to make changes, repeating the process as necessary The Bad News About CGI To understand the drawbacks of CGI, you have to consider exactly what s happening when a CGI program is executed For example, to call the application in Listing 1-1, I might use a URL like this: http://localhost/sayhellocgi/sayhellocgiexe In Microsoft Internet Information Services (IIS), this URL will do one of two things It will either offer to download the program SayHelloCGIexe from the sayhellocgi virtual directory to the local machine, or it will execute the program.

FindUsersbyname This method gets a collection of membership users with the specified user names. generatePassword This method creates a random password of the specified length. Use this if you are implementing custom controls to generate or reset passwords. getAllUsers

Destination: 192.168.9.0 Network Mask: 255.255.255.0 Metric: 1 Dial-Out Credentials User Name: VPN_CorpHQ Domain: electronic.example.com Password: o3\Dn6@`-J4 Confirm Password: o3\Dn6@`-J4

This method returns a collection of all users in the database. This method returns the number of users currently

This method returns a MembershipUser object representing the current logged-on user. Call this method any time you need to access the current user s account.

Once the demand-dial interface is created, one change needs to be made. For the properties of the demand-dial interface, on the Options tab, under Connection Type, Persistent Connection must be selected.

UpdateUser This method updates the database with the information for the specified user. Use this method if you create a page to enable users or administrators to modify existing accounts. validateUser This method verifies that the supplied user name and password are valid. Use this method to check a user s credentials if you create your own custom logon controls.