Programming

To get your code to compile, I would suggest you include a header that contains the definition of the crypt function that you are using.

To get your code to work, I would suggest is futile.

The function seems designed to prevent such brute force attacks. The man page clearly explained that.

Wtf???? You can have a knife to kill or to cut your bread!!!
There is no protection if you want to kill somebody!!!
What can I do know?????

Passwords need this protection becase otherwise people would do things like what you're doing.

What is the ultimate goal here?

I am making a program in which you can set a password on program launch. But in order to set it you have to type user login and passwd. By this way your little brother will not set a passwd !!!

1. Link with "-lcrypt". Then your code will compile. It still won't work, though.

2. The pw_passwd field isn't obfuscated as much as it's not even used any more. See 'man getspnam".

---------- Post updated at 09:37 AM ---------- Previous update was at 09:34 AM ----------

That's pointless.

Just set the permissions on the binary to only allow execution by the owner.

Sometimes there are persons that you allow them to log-in from your account, aren't they?

So, to conclude, there is NO way to check user login and password from C++. Is this right???

No, never. This is a very poor practice, when UNIX has such a wide arrays of better ways to share and restrict things. Better to use existing systems rather than try and craft your own; probably safer too, less likely to break when the security system changes a little and less prone to bugs of a very dangerous sort. PAM, the usual Linux authentication system, might be one way. sudo would be another, since it can be configured to ask you for your own password when you try to run 'sudo something'.