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//
// Copyright © 2020 Thomas A. Early, N7TAE
//
// ----------------------------------------------------------------------------
//
// m17ref is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// m17ref is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// with this software. If not, see <http://www.gnu.org/licenses/>.
// ----------------------------------------------------------------------------
#pragma once
#include <cstdint>
#include <string.h>
#include <memory>
#include "callsign.h"
////////////////////////////////////////////////////////////////////////////////////////
// aliases
// M17 Packets
//all structures must be big endian on the wire, so you'll want htonl (man byteorder 3) and such.
using SM17Lich = struct __attribute__((__packed__)) lich_tag {
uint8_t addr_dst[6];
uint8_t addr_src[6];
uint16_t frametype; //frametype flag field per the M17 spec
uint8_t nonce[14]; //bytes for the nonce
}; // 6 + 6 + 2 + 14 = 28 bytes
//without SYNC or other parts
using SM17Frame = struct __attribute__((__packed__)) m17_tag {
uint8_t magic[4];
uint16_t streamid;
SM17Lich lich;
uint16_t framenumber;
uint8_t payload[16];
uint16_t crc; //16 bit CRC
}; // 4 + 2 + 28 + 2 + 16 + 2 = 54 bytes
// includes extra bool (1 byte) for enforcing one-hop policy
using SRefM17Frame = struct __attribute__((__packed__)) peer_tag {
SM17Frame frame;
bool relayed;
}; // 4 + 2 + 28 + 2 + 16 + 2 + 1 = 55 bytes
using SInterConnect = struct __attribute__((__packed__)) interconnect_tag {
uint8_t magic[4];
uint8_t fromcs[6];
uint8_t mods[27];
}; // 37 bytes
class CPacket
{
public:
CPacket() {}
CPacket(const uint8_t *buf, bool is_internal);
const CCallsign &GetDestCallsign() const;
char GetDestModule() const;
const CCallsign &GetSourceCallsign() const;
uint16_t GetStreamId() const;
uint16_t GetCRC() const;
void SetCRC(uint16_t crc);
void SetRelay(bool state);
bool GetRelay() const;
std::unique_ptr<CPacket> Duplicate(void) const;
bool IsLastPacket() const;
SRefM17Frame &GetFrame();
private:
CCallsign destination, source;
SRefM17Frame m17;
};