Restricting users from connecting through SQL*Plus/Toad

SQL> desc LOGONAUDITTABLE
 Name                                      Null?    Type
 ----------------------------------------- -------- ---------------------
 EVENT                                              VARCHAR2(10)
 TIMESTAMP                                     DATE
 SCHEMA                                           VARCHAR2(30)
 OSUSERID                                         VARCHAR2(30)
 MACHINENAME                              VARCHAR2(64)
 SID                                                      NUMBER
 SERIAL#                                            NUMBER
 PROGRAM                                         VARCHAR2(100)

CREATE OR REPLACE TRIGGER logonauditing
AFTER LOGON ON database
DECLARE
   machinename VARCHAR2(64);
   osuserid    VARCHAR2(30);
   sid NUMBER;
   serial# NUMBER;
   program VARCHAR2(100);
   module  varchar2(100);
   CURSOR c1 IS
     SELECT osuser,
         machine ,
   sid ,
   serial# ,
   program,
   module
  FROM   v$session
  WHERE  audsid = USERENV( 'sessionid' );
BEGIN
   OPEN c1;
   FETCH c1 INTO osuserid,machinename,sid,serial#,program, module ;
       if upper(program) = 'TOAD.EXE'
      or upper(module) = 'T.O.A.D.' then
       if user != 'R11' then
             INSERT INTO LOGONAUDITTABLE
                 VALUES ( 'LOGON', SYSDATE,USER,osuserid,
                                    machinename,sid,serial#,program);
    end if;
    end if;
   CLOSE c1;
END;
/

CREATE OR REPLACE PROCEDURE KILLSESSION AS
   sid NUMBER;
   serial# NUMBER;
   timestamp DATE;
   CURSOR c1 IS
       SELECT sid ,
           serial#,
     timestamp
    FROM   LOGONAUDITTABLE;
    --WHERE INSTR(UPPER(program),UPPER('plus33w')) > 0;
BEGIN
   FOR i1 IN c1 LOOP
      execute IMMEDIATE 'alter system kill session 
       ' ||''''||i1.sid||','||i1.serial#||'''';
   DELETE LOGONAUDITTABLE
   WHERE sid = i1.sid
   AND serial#=i1.serial#
   AND timestamp = i1.timestamp;
   END LOOP;
   COMMIT;
END;
/