What's the right sentence: he said he knew her for a long time?

[Jaysee]

he said he knew her for a long time

he said he had known her for a long time

he said he has known her for a long time

are these sentences right, please? how would a native say?
thanks.

[Barb_D]

He said, "I've known her for a long time."

Eh, what's that? What did he just say?
He just said [that] he's known her for a long time.

What did he say to you about her?
He said [that] he'd known her for a long time.