/*
 * Copyright 2003-2004, Waldemar Kornewald <wkornew@gmx.net>
 * Distributed under the terms of the MIT License.
 */

#ifndef DISCOVERY_PACKET__H
#define DISCOVERY_PACKET__H

#include "PPPoE.h"

#include <TemplateList.h>

#define ETHER_HDR_LEN 14

enum PPPoE_TAG_TYPE {
        END_OF_LIST = 0x0000,
        SERVICE_NAME = 0x0101,
        AC_NAME = 0x0102,
        HOST_UNIQ = 0x0103,
        AC_COOKIE = 0x0104,
        VENDOR_SPECIFIC = 0x0105,
        RELAY_SESSION_ID = 0x0110,
        SERVICE_NAME_ERROR = 0x0201,
        AC_SYSTEM_ERROR = 0x0202,
        GENERIC_ERROR = 0x0203
};

enum PPPoE_CODE {
        PADI = 0x09,
        PADO = 0x07,
        PADR = 0x19,
        PADS = 0x65,
        PADT = 0xA7
};


typedef struct pppoe_tag {
        uint16 type;
        uint16 length;
        uint8 data[0];
} pppoe_tag;


class DiscoveryPacket {
        public:
                DiscoveryPacket(uint8 code, uint16 sessionID = 0x0000);
                DiscoveryPacket(net_buffer *packet, uint32 start = 0);
                ~DiscoveryPacket();
                
                status_t InitCheck() const
                        { return fInitStatus; }
                
                void SetCode(uint8 code)
                        { fCode = code; }
                uint8 Code() const
                        { return fCode; }
                
                void SetSessionID(uint16 sessionID)
                        { fSessionID = sessionID; }
                uint16 SessionID() const
                        { return fSessionID; }
                
                bool AddTag(uint16 type, const void *data, uint16 length, int32 index = -1);
                bool RemoveTag(pppoe_tag *tag);
                int32 CountTags() const
                        { return fTags.CountItems(); }
                pppoe_tag *TagAt(int32 index) const;
                pppoe_tag *TagWithType(uint16 type) const;
                
                net_buffer *ToNetBuffer(uint32 MTU);
                        // the user is responsible for freeing the net_buffer

        private:
                uint8 fCode;
                uint16 fSessionID;
                TemplateList<pppoe_tag*> fTags;
                status_t fInitStatus;
};


#endif