auth_get_canonical_hostname
hostname = auth_get_canonical_hostname(ssh, options.use_dns);
const char *auth_get_canonical_hostname(struct ssh *, int);
resolvedname = auth_get_canonical_hostname(ssh, options.use_dns);
remote_host = auth_get_canonical_hostname(ssh, options.use_dns);
remote = auth_get_canonical_hostname(ssh, use_dns);