EPSV
{ "EPSV", EPSV, ARGS, 1, "[<sp> af|ALL]", 0, },
LPRT LPSV EPRT EPSV
| EPSV check_login SP NUMBER CRLF
| EPSV check_login SP ALL CRLF
| EPSV check_login CRLF
case EPSV:
*state = EPSV;