easy:SetOpt_SSH_KnownHosts -- file name holding the SSH known hosts
Pass a string holding the file name of the
known_host file to use. The known_hosts file should use the OpenSSH file
format as supported by libssh2. If this file is specified, libcurl will only
accept connections with hosts that are known and present in that file, with a
matching public key. Use #CURLOPT_SSH_KEYFUNCTION to alter the default
behavior on host and key (mis)matching.