106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
//
|
||
|
|
// Copyright (c) 1998, Microsoft Corp. All rights reserved.
|
||
|
|
//
|
||
|
|
// FILE
|
||
|
|
//
|
||
|
|
// eapfsm.h
|
||
|
|
//
|
||
|
|
// SYNOPSIS
|
||
|
|
//
|
||
|
|
// Declares the class EAPFSM
|
||
|
|
//
|
||
|
|
// MODIFICATION HISTORY
|
||
|
|
//
|
||
|
|
// 08/26/1998 Original version.
|
||
|
|
//
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
#ifndef _EAPFSM_H_
|
||
|
|
#define _EAPFSM_H_
|
||
|
|
#if _MSC_VER >= 1000
|
||
|
|
#pragma once
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <raseapif.h>
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
//
|
||
|
|
// CLASS
|
||
|
|
//
|
||
|
|
// EAPFSM
|
||
|
|
//
|
||
|
|
// DESCRIPTION
|
||
|
|
//
|
||
|
|
// Implements a Finite State Machine governing the EAP session lifecycle.
|
||
|
|
// The state machine must be shown all incoming packets and all outgoing
|
||
|
|
// actions. The main purpose of the FSM is to decide how to respond to
|
||
|
|
// incoming messages.
|
||
|
|
//
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
class EAPFSM
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
EAPFSM(BYTE eapType) throw ()
|
||
|
|
: eapType(eapType),
|
||
|
|
state(0),
|
||
|
|
naks(0)
|
||
|
|
{ }
|
||
|
|
|
||
|
|
// Actions in response to messages.
|
||
|
|
enum Action
|
||
|
|
{
|
||
|
|
MAKE_MESSAGE, // Invoke RasEapMakeMessage.
|
||
|
|
REPLAY_LAST, // Replay the last response from the DLL.
|
||
|
|
FAIL_NEGOTIATE, // Negotiation failed -- reject the user.
|
||
|
|
DISCARD // Unexpected packet -- silently discard.
|
||
|
|
};
|
||
|
|
|
||
|
|
// Called whenever the EAP extension DLL generates a new response.
|
||
|
|
void onDllEvent(
|
||
|
|
PPP_EAP_ACTION action,
|
||
|
|
const PPP_EAP_PACKET& sendPacket
|
||
|
|
) throw ();
|
||
|
|
|
||
|
|
// Called whenever a new packet is received.
|
||
|
|
Action onReceiveEvent(
|
||
|
|
const PPP_EAP_PACKET& recvPkt
|
||
|
|
) throw ();
|
||
|
|
|
||
|
|
protected:
|
||
|
|
|
||
|
|
// Returns TRUE if the packet is an expected reponse.
|
||
|
|
BOOL isExpected(const PPP_EAP_PACKET& recvPkt) const throw ()
|
||
|
|
{
|
||
|
|
return (recvPkt.Id == expectedId) || passive;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns TRUE if the packet is a repeat.
|
||
|
|
BOOL isRepeat(const PPP_EAP_PACKET& recvPkt) const throw ()
|
||
|
|
{
|
||
|
|
return (recvPkt.Id == lastId) && (recvPkt.Data[0] == lastType);
|
||
|
|
}
|
||
|
|
|
||
|
|
/////////
|
||
|
|
// Various states for an EAP session.
|
||
|
|
/////////
|
||
|
|
|
||
|
|
enum State
|
||
|
|
{
|
||
|
|
STATE_INITIAL = 0,
|
||
|
|
STATE_NEGOTIATING = 1,
|
||
|
|
STATE_ACTIVE = 2,
|
||
|
|
STATE_DONE = 3
|
||
|
|
};
|
||
|
|
|
||
|
|
BYTE eapType; // EAP type being negotiated.
|
||
|
|
BYTE state; // State of the session.
|
||
|
|
BYTE naks; // Number of NAK's received so far.
|
||
|
|
BYTE passive; // Non-zero if we're in passive listening mode.
|
||
|
|
BYTE lastId; // Last packet ID received.
|
||
|
|
BYTE lastType; // Last packet type received.
|
||
|
|
BYTE expectedId; // Next packet ID expected.
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif // _EAPFSM_H_
|