Connect to server within open source application [closed]

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What is the best, most secure way to connect to a server such as a mysql server, from within a program that's source code will be released? I'm trying to keep from just giving out an ip address. Sorry if this is a bad or simple question, I am really new to network centered programming.

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You can have a file that holds that info and then the program just reads from there, or you can have that info in a source code file that you include in the main program. Just don't share them with the rest of the source code and you're set ;)

e.g.
readDataFromFile("confidential.dat")
or
#include "confidential.h"
(...)

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You would do this the same way you would make pi into a rational number. You can't make an IP address in a distributed program a secret. 'netstat' if nothing else will reveal it as soon as the program makes a connection to your server.