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Identifying Remote Hosts
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| The htmlCgi class makes it easy to identify the IP address of the remote computer accessing your application. To do so, simply instantiate an htmlCgi object, then check the Remote_Addr and Remote_Host member variables.
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| Remote_Addr is always available, and contains the IP address of the remote client host or proxy server that originated the request.
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| Remote_Host is usually available, and represents the reverse lookup hostname and domain name (e.g., ppp110.connectup.com) associated with the IP address in Remote_Addr. The value isn't always available because many DNS servers are often not configured to report the information.
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| You could use this capability to generate custom content based on who views the documents, such as presenting tailored pages to users from certain companies or networks.
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| #include <stdio.h>
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| #include <stdlib.h>
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| #include <dcmicro/htmlpp/htmlpp.h>
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| int main( void )
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| {
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| htmlPage page( "html++ example application" ) ;
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| // Construct an htmlCgi object to receive
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| // the CGI form data from standard input.
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| htmlCgi server( cin ) ;
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| // Output variables that identify the remote host
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| page << "Remote_Addr: " << server.Remote_Addr
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| << htmlBreak()
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| << "Remote_Host: " << server.Remote_Host ;
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| server << page ;
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| return 0 ;
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| }
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| Content-Type: text/html
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| <HTML>
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| <HEAD>
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| <TITLE>html++ example application</TITLE>
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| </HEAD>
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| <BODY>
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| Remote_Addr: 206.222.111.14<BR>
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| Remote_Host: ip111-14.connectup.com
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| </BODY>
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| </HTML>
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