Explain: Linux and UNIX TCP Wrappers – Find Out If a Program Is Compiled With TCP Wrappers

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TCP Wrappers is a security feature in Unix-based systems that provides access control and authentication for network services. TCP Wrappers allow you to specify which hosts or networks are allowed to connect to your services, and which services they are allowed to use.

You can find out if a program is compiled with TCP Wrappers using the ldd command. The ldd command is used to show the shared library dependencies of an executable program.

Here’s how to find out if a program is compiled with TCP Wrappers:

  1. Open a terminal window on your Linux or Unix system.
  2. Type the following command: ldd <path_to_program> and press Enter. Replace <path_to_program> with the actual path to the program that you want to check.
  3. Look for the libwrap.so library in the output. If the program is compiled with TCP Wrappers, you will see a line that looks like this: libwrap.so.0 => /lib64/libwrap.so.0 (0x00007f090874e000).
  4. If you don’t see the libwrap.so library in the output, then the program is not compiled with TCP Wrappers.

In summary, using ldd command you can check if a program is compiled with TCP Wrappers by looking for the presence of libwrap.so library in the output.

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