write a whole multi-threaded program in C where the amount of threads can be specified by the user, that takes a list of ip addresses from stdin and attempts to login to each ip on ssh with libssh with a user-specified credential file. it will not log failed attempts. it will use credential combinations that are in the credential file. when it succeeds in logging in, it will print the used credential combination and also log it to a file named vuln.txt. the program is made to operate as fast as possible when working with a very large list of ip addresses, exceeding millions of ip addresses.
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