packet.h

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00001 /*
00002  *  anytun
00003  *
00004  *  The secure anycast tunneling protocol (satp) defines a protocol used
00005  *  for communication between any combination of unicast and anycast
00006  *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
00007  *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
00008  *  ethernet, ip, arp ...). satp directly includes cryptography and
00009  *  message authentication based on the methodes used by SRTP.  It is
00010  *  intended to deliver a generic, scaleable and secure solution for
00011  *  tunneling and relaying of packets of any protocol.
00012  *
00013  *
00014  *  Copyright (C) 2007 anytun.org <satp@wirdorange.org>
00015  *
00016  *  This program is free software; you can redistribute it and/or modify
00017  *  it under the terms of the GNU General Public License version 2
00018  *  as published by the Free Software Foundation.
00019  *
00020  *  This program is distributed in the hope that it will be useful,
00021  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00022  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00023  *  GNU General Public License for more details.
00024  *
00025  *  You should have received a copy of the GNU General Public License
00026  *  along with this program (see the file COPYING included with this
00027  *  distribution); if not, write to the Free Software Foundation, Inc.,
00028  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00029  */
00030 
00031 #ifndef _PACKET_H_
00032 #define _PACKET_H_
00033 
00034 #include "datatypes.h"
00035 #include "buffer.h"
00036 
00037 class Packet : public Buffer
00038 {
00039 public:
00040   Packet();
00041   Packet(u_int32_t length);
00042   Packet(const Buffer &src);
00043   
00044   bool hasHeader() const;
00045   Packet& withHeader(bool b);
00046   seq_nr_t getSeqNr() const;
00047   sender_id_t getSenderId() const;
00048   Packet& addHeader(seq_nr_t seq_nr, sender_id_t sender_id);
00049   Packet& removeHeader();
00050   Packet& setSeqNr(seq_nr_t seq_nr);
00051   Packet& setSenderId(sender_id_t sender_id);
00052                        
00053   bool hasPayloadType() const;
00054   Packet& withPayloadType(bool b);
00055   payload_type_t getPayloadType() const;  
00056   Packet& addPayloadType(payload_type_t payload_type);
00057   Packet& removePayloadType();
00058   
00059   bool hasAuthTag() const;
00060   Packet& withAuthTag(bool b);
00061   auth_tag_t getAuthTag() const;
00062   Packet& addAuthTag(auth_tag_t auth_tag);
00063   Packet& removeAuthTag();                     
00064 
00065 private:
00066   struct HeaderStruct
00067   {
00068     seq_nr_t seq_nr;
00069     sender_id_t sender_id;
00070   }__attribute__((__packed__));
00071   bool has_header_;
00072   bool has_payload_type_;
00073   bool has_auth_tag_;
00074 };
00075 
00076 #endif

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