RPCAUTH_UNIX
auth->authtype = htonl(RPCAUTH_UNIX);
*tl++ = txdr_unsigned(RPCAUTH_UNIX);
*tl = txdr_unsigned(RPCAUTH_UNIX);
*tl++ = txdr_unsigned(RPCAUTH_UNIX);
*tl = txdr_unsigned(RPCAUTH_UNIX);