Set desired auth types for sftp and scp
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSH_AUTH_TYPES, long bitmask);
Pass a long set to a bitmask consisting of one or more of CURLSSH_AUTH_PUBLICKEY, CURLSSH_AUTH_PASSWORD, CURLSSH_AUTH_HOST, CURLSSH_AUTH_KEYBOARD and CURLSSH_AUTH_AGENT.
Set CURLSSH_AUTH_ANY to let libcurl pick a suitable one. Currently CURLSSH_AUTH_HOST has no effect. If CURLSSH_AUTH_AGENT is used, libcurl attempts to connect to ssh-agent or pageant and let the agent attempt the authentication.
SFTP and SCP
CURLSSH_AUTH_HOST was added in 7.16.1, CURLSSH_AUTH_AGENT was added in 7.28.0
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.