RETR
{ "RETR", RETR, STR1, 1, "<sp> file-name" },
| RETR SP pathname CRLF check_login
{ "RETR", RETR, STR1, 1, "<sp> file-name" },
PASV TYPE STRU MODE RETR STOR
if (((state == STAT || state == RETR || state == TOP)
} else if (state == RETR) {
state = RETR;
if ((state == STAT && !do_from) || state == RETR)