Pirc's Attack (2... f5)

Hello. I got a opponent which as black plays:
1: e4 d6
2: d4 (Nf3 or Nc3 makes no diffrence) f5

I searched on google, there's no theory about this opening. Some1 knows a bit of theory in this opening?

with 3. Nc3 you should do great.
1. e4 ...d6, 2. d4 ...f5, 3. Nc3 ...Nf6, 4. exf5 ...Bxf5, 5. Nf3 ...Nc6, 6. d5 ...Nb4, 7. Nd4 ...Qd7, 8. Bb5 ...c6, 9. dxc6 ...Nxc6, 10. Nxf5 Qxf5, 11. 0-0, d5
Not that your opponent'll follow strictly this line, sometimes neither will you, but it keeps white's advantage after the two first moves.
Just Nc3 and see what will your opponent do. Then just keep the pressure at the center and you'll do great.
If he takes with 3...fxe5, just recapture with your knight and you have the initiative AND the advantage of him losing the essential f pawn, which at the beginning of the game is hugely essential, since only the king protects it.

Hope I can be of any help.

Thanks alot. However, the queen on f5 seems to be pretty dangerous. And my opponent likes not to castle and make a fortress in the middle and attack with the h and g pawns after I castled kingside.