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Luca Marchesano 7 years ago committed by GitHub
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//
// cdplusprotocol.cpp
// xlxd
//
// Created by Jean-Luc Deltombe (LX3JL) on 01/11/2015.
// Copyright © 2015 Jean-Luc Deltombe (LX3JL). All rights reserved.
//
// ----------------------------------------------------------------------------
// This file is part of xlxd.
//
// xlxd 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.
//
// xlxd 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
// along with Foobar. If not, see <http://www.gnu.org/licenses/>.
// ----------------------------------------------------------------------------
#include "main.h"
#include <string.h>
#include "cdplusclient.h"
#include "cdplusprotocol.h"
#include "creflector.h"
#include "cgatekeeper.h"
////////////////////////////////////////////////////////////////////////////////////////
// operation
bool CDplusProtocol::Init(void)
{
bool ok;
// base class
ok = CProtocol::Init();
// update the reflector callsign
m_ReflectorCallsign.PatchCallsign(0, (const uint8 *)"REF", 3);
// create our socket
ok &= m_Socket.Open(DPLUS_PORT);
if ( !ok )
{
std::cout << "Error opening socket on port UDP" << DPLUS_PORT << " on ip " << g_Reflector.GetListenIp() << std::endl;
}
// update time
m_LastKeepaliveTime.Now();
// done
return ok;
}
////////////////////////////////////////////////////////////////////////////////////////
// task
void CDplusProtocol::Task(void)
{
CBuffer Buffer;
CIp Ip;
CCallsign Callsign;
CDvHeaderPacket *Header;
CDvFramePacket *Frame;
CDvLastFramePacket *LastFrame;
// handle incoming packets
if ( m_Socket.Receive(&Buffer, &Ip, 20) != -1 )
{
// crack the packet
if ( (Frame = IsValidDvFramePacket(Buffer)) != NULL )
{
//std::cout << "DPlus DV frame" << std::endl;
// handle it
OnDvFramePacketIn(Frame, &Ip);
}
else if ( (Header = IsValidDvHeaderPacket(Buffer)) != NULL )
{
//std::cout << "DPlus DV header:" << std::endl << *Header << std::endl;
// callsign muted?
if ( g_GateKeeper.MayTransmit(Header->GetMyCallsign(), Ip, PROTOCOL_DPLUS, Header->GetRpt2Module()) )
{
// handle it
OnDvHeaderPacketIn(Header, Ip);
}
else
{
delete Header;
}
}
else if ( (LastFrame = IsValidDvLastFramePacket(Buffer)) != NULL )
{
//std::cout << "DPlus DV last frame" << std::endl;
// handle it
OnDvLastFramePacketIn(LastFrame, &Ip);
}
else if ( IsValidConnectPacket(Buffer) )
{
std::cout << "DPlus connect request packet from " << Ip << std::endl;
// acknowledge the request
m_Socket.Send(Buffer, Ip);
}
else if ( IsValidLoginPacket(Buffer, &Callsign) )
{
std::cout << "DPlus login packet from " << Callsign << " at " << Ip << std::endl;
// callsign authorized?
if ( g_GateKeeper.MayLink(Callsign, Ip, PROTOCOL_DPLUS) )
{
// acknowledge the request
EncodeLoginAckPacket(&Buffer);
m_Socket.Send(Buffer, Ip);
// create the client
CDplusClient *client = new CDplusClient(Callsign, Ip);
// and append
g_Reflector.GetClients()->AddClient(client);
g_Reflector.ReleaseClients();
}
else
{
// deny the request
EncodeLoginNackPacket(&Buffer);
m_Socket.Send(Buffer, Ip);
}
}
else if ( IsValidDisconnectPacket(Buffer) )
{
std::cout << "DPlus disconnect packet from " << Ip << std::endl;
// find client
CClients *clients = g_Reflector.GetClients();
CClient *client = clients->FindClient(Ip, PROTOCOL_DPLUS);
if ( client != NULL )
{
// remove it
clients->RemoveClient(client);
// and acknowledge the disconnect
EncodeDisconnectPacket(&Buffer);
m_Socket.Send(Buffer, Ip);
}
g_Reflector.ReleaseClients();
}
else if ( IsValidKeepAlivePacket(Buffer) )
{
//std::cout << "DPlus keepalive packet from " << Ip << std::endl;
// find all clients with that callsign & ip and keep them alive
CClients *clients = g_Reflector.GetClients();
int index = -1;
CClient *client = NULL;
while ( (client = clients->FindNextClient(Ip, PROTOCOL_DPLUS, &index)) != NULL )
{
client->Alive();
}
g_Reflector.ReleaseClients();
}
else
{
std::cout << "DPlus packet (" << Buffer.size() << ")" << std::endl;
}
}
// handle end of streaming timeout
CheckStreamsTimeout();
// handle queue from reflector
HandleQueue();
// keep client alive
if ( m_LastKeepaliveTime.DurationSinceNow() > DPLUS_KEEPALIVE_PERIOD )
{
//
HandleKeepalives();
// update time
m_LastKeepaliveTime.Now();
}
}
////////////////////////////////////////////////////////////////////////////////////////
// streams helpers
bool CDplusProtocol::OnDvHeaderPacketIn(CDvHeaderPacket *Header, const CIp &Ip)
{
bool newstream = false;
// find the stream
CPacketStream *stream = GetStream(Header->GetStreamId());
if ( stream == NULL )
{
// no stream open yet, open a new one
CCallsign via(Header->GetRpt1Callsign());
// first, check module is valid
if ( g_Reflector.IsValidModule(Header->GetRpt1Module()) )
{
// find this client
CClient *client = g_Reflector.GetClients()->FindClient(Ip, PROTOCOL_DPLUS);
if ( client != NULL )
{
// now we know if it's a dextra dongle or a genuine dplus node
if ( Header->GetRpt2Callsign().HasSameCallsignWithWildcard(CCallsign("XRF*")) )
{
client->SetDextraDongle();
}
// now we know its module, let's update it
if ( !client->HasModule() )
{
client->SetModule(Header->GetRpt1Module());
}
// get client callsign
via = client->GetCallsign();
// and try to open the stream
if ( (stream = g_Reflector.OpenStream(Header, client)) != NULL )
{
// keep the handle
m_Streams.push_back(stream);
newstream = true;
}
}
// release
g_Reflector.ReleaseClients();
// update last heard
g_Reflector.GetUsers()->Hearing(Header->GetMyCallsign(), via, Header->GetRpt2Callsign());
g_Reflector.ReleaseUsers();
// delete header if needed
if ( !newstream )
{
delete Header;
}
}
else
{
std::cout << "DPlus node " << via << " link attempt on non-existing module" << std::endl;
}
}
else
{
// stream already open
// skip packet, but tickle the stream
stream->Tickle();
// and delete packet
delete Header;
}
// done
return newstream;
}
////////////////////////////////////////////////////////////////////////////////////////
// queue helper
void CDplusProtocol::HandleQueue(void)
{
m_Queue.Lock();
while ( !m_Queue.empty() )
{
// get the packet
CPacket *packet = m_Queue.front();
m_Queue.pop();
// get our sender's id
int iModId = g_Reflector.GetModuleIndex(packet->GetModuleId());
// check if it's header and update cache
if ( packet->IsDvHeader() )
{
// this relies on queue feeder setting valid module id
m_StreamsCache[iModId].m_dvHeader = CDvHeaderPacket((const CDvHeaderPacket &)*packet);
m_StreamsCache[iModId].m_iSeqCounter = 0;
}
// encode it
CBuffer buffer;
if ( EncodeDvPacket(*packet, &buffer) )
{
// and push it to all our clients who are not streaming in
// note that for dplus protocol, all stream of all modules are push to all clients
// it's client who decide which stream he's interrrested in
CClients *clients = g_Reflector.GetClients();
int index = -1;
CClient *client = NULL;
while ( (client = clients->FindNextClient(PROTOCOL_DPLUS, &index)) != NULL )
{
// is this client busy ?
if ( !client->IsAMaster() )
{
// check if client is a dextra dongle
// then replace RPT2 with XRF instead of REF
// if the client type is not yet known, send bothheaders
if ( packet->IsDvHeader() )
{
// sending header in Dplus is client specific
SendDvHeader((CDvHeaderPacket *)packet, (CDplusClient *)client);
}
else if ( packet->IsDvFrame() )
{
// and send the DV frame
m_Socket.Send(buffer, client->GetIp());
// is it time to insert a DVheader copy ?
if ( (m_StreamsCache[iModId].m_iSeqCounter++ % 21) == 20 )
{
// yes, clone it
CDvHeaderPacket packet2(m_StreamsCache[iModId].m_dvHeader);
// and send it
SendDvHeader(&packet2, (CDplusClient *)client);
}
}
else
{
// otherwise, send the original packet
m_Socket.Send(buffer, client->GetIp());
}
}
}
g_Reflector.ReleaseClients();
}
// done
delete packet;
}
m_Queue.Unlock();
}
void CDplusProtocol::SendDvHeader(CDvHeaderPacket *packet, CDplusClient *client)
{
// encode it
CBuffer buffer;
if ( EncodeDvPacket(*packet, &buffer) )
{
if ( (client->IsDextraDongle() || !client->HasModule()) )
{
// clone the packet and patch it
CDvHeaderPacket packet2(*((CDvHeaderPacket *)packet));
CCallsign rpt2 = packet2.GetRpt2Callsign();
rpt2.PatchCallsign(0, (const uint8 *)"XRF", 3);
packet2.SetRpt2Callsign(rpt2);
// encode it
CBuffer buffer2;
if ( EncodeDvPacket(packet2, &buffer2) )
{
// and send it
m_Socket.Send(buffer2, client->GetIp());
}
// client type known ?
if ( !client->HasModule() )
{
// no, send also the genuine packet
m_Socket.Send(buffer, client->GetIp());
}
}
else
{
// otherwise, send the original packet
m_Socket.Send(buffer, client->GetIp());
}
}
}
////////////////////////////////////////////////////////////////////////////////////////
// keepalive helpers
void CDplusProtocol::HandleKeepalives(void)
{
// send keepalives
CBuffer keepalive;
EncodeKeepAlivePacket(&keepalive);
// iterate on clients
CClients *clients = g_Reflector.GetClients();
int index = -1;
CClient *client = NULL;
while ( (client = clients->FindNextClient(PROTOCOL_DPLUS, &index)) != NULL )
{
// send keepalive
//std::cout << "Sending DPlus packet @ " << client->GetIp() << std::endl;
m_Socket.Send(keepalive, client->GetIp());
// is this client busy ?
if ( client->IsAMaster() )
{
// yes, just tickle it
client->Alive();
}
// check it's still with us
else if ( !client->IsAlive() )
{
// no, disconnect
CBuffer disconnect;
EncodeDisconnectPacket(&disconnect);
m_Socket.Send(disconnect, client->GetIp());
// and remove it
std::cout << "DPlus client " << client->GetCallsign() << " keepalive timeout" << std::endl;
clients->RemoveClient(client);
}
}
g_Reflector.ReleaseClients();
}
////////////////////////////////////////////////////////////////////////////////////////
// packet decoding helpers
bool CDplusProtocol::IsValidConnectPacket(const CBuffer &Buffer)
{
uint8 tag[] = { 0x05,0x00,0x18,0x00,0x01 };
return (Buffer == CBuffer(tag, sizeof(tag)));
}
bool CDplusProtocol::IsValidLoginPacket(const CBuffer &Buffer, CCallsign *Callsign)
{
uint8 Tag[] = { 0x1C,0xC0,0x04,0x00 };
bool valid = false;
if ( (Buffer.size() == 28) &&(::memcmp(Buffer.data(), Tag, sizeof(Tag)) == 0) )
{
Callsign->SetCallsign(&(Buffer.data()[4]), 8);
valid = Callsign->IsValid();
}
return valid;
}
bool CDplusProtocol::IsValidDisconnectPacket(const CBuffer &Buffer)
{
uint8 tag[] = { 0x05,0x00,0x18,0x00,0x00 };
return (Buffer == CBuffer(tag, sizeof(tag)));
}
bool CDplusProtocol::IsValidKeepAlivePacket(const CBuffer &Buffer)
{
uint8 tag[] = { 0x03,0x60,0x00 };
return (Buffer == CBuffer(tag, sizeof(tag)));
}
CDvHeaderPacket *CDplusProtocol::IsValidDvHeaderPacket(const CBuffer &Buffer)
{
CDvHeaderPacket *header = NULL;
if ( (Buffer.size() == 58) &&
(Buffer.data()[0] == 0x3A) && (Buffer.data()[1] == 0x80) &&
(Buffer.Compare((uint8 *)"DSVT", 2, 4) == 0) &&
(Buffer.data()[6] == 0x10) && (Buffer.data()[10] == 0x20) )
{
// create packet
header = new CDvHeaderPacket((struct dstar_header *)&(Buffer.data()[17]),
*((uint16 *)&(Buffer.data()[14])), 0x80);
// check validity of packet
if ( !header->IsValid() )
{
delete header;
header = NULL;
}
}
return header;
}
CDvFramePacket *CDplusProtocol::IsValidDvFramePacket(const CBuffer &Buffer)
{
CDvFramePacket *dvframe = NULL;
if ( (Buffer.size() == 29) &&
(Buffer.data()[0] == 0x1D) && (Buffer.data()[1] == 0x80) &&
(Buffer.Compare((uint8 *)"DSVT", 2, 4) == 0) &&
(Buffer.data()[6] == 0x20) && (Buffer.data()[10] == 0x20) )
{
// create packet
dvframe = new CDvFramePacket((struct dstar_dvframe *)&(Buffer.data()[17]),
*((uint16 *)&(Buffer.data()[14])), Buffer.data()[16]);
// check validity of packet
if ( !dvframe->IsValid() )
{
delete dvframe;
dvframe = NULL;
}
}
return dvframe;
}
CDvLastFramePacket *CDplusProtocol::IsValidDvLastFramePacket(const CBuffer &Buffer)
{
CDvLastFramePacket *dvframe = NULL;
if ( (Buffer.size() == 32) &&
(Buffer.Compare((uint8 *)"DSVT", 2, 4) == 0) &&
(Buffer.data()[0] == 0x20) && (Buffer.data()[1] == 0x80) &&
(Buffer.data()[6] == 0x20) && (Buffer.data()[10] == 0x20) )
{
// create packet
dvframe = new CDvLastFramePacket((struct dstar_dvframe *)&(Buffer.data()[17]),
*((uint16 *)&(Buffer.data()[14])), Buffer.data()[16]);
// check validity of packet
if ( !dvframe->IsValid() )
{
delete dvframe;
dvframe = NULL;
}
}
return dvframe;
}
////////////////////////////////////////////////////////////////////////////////////////
// packet encoding helpers
void CDplusProtocol::EncodeKeepAlivePacket(CBuffer *Buffer)
{
uint8 tag[] = { 0x03,0x60,0x00 };
Buffer->Set(tag, sizeof(tag));
}
void CDplusProtocol::EncodeLoginAckPacket(CBuffer *Buffer)
{
uint8 tag[] = { 0x08,0xC0,0x04,0x00,'O','K','R','W' };
Buffer->Set(tag, sizeof(tag));
}
void CDplusProtocol::EncodeLoginNackPacket(CBuffer *Buffer)
{
uint8 tag[] = { 0x08,0xC0,0x04,0x00,'B','U','S','Y' };
Buffer->Set(tag, sizeof(tag));
}
void CDplusProtocol::EncodeDisconnectPacket(CBuffer *Buffer)
{
uint8 tag[] = { 0x05,0x00,0x18,0x00,0x00 };
Buffer->Set(tag, sizeof(tag));
}
bool CDplusProtocol::EncodeDvHeaderPacket(const CDvHeaderPacket &Packet, CBuffer *Buffer) const
{
uint8 tag[] = { 0x3A,0x80,0x44,0x53,0x56,0x54,0x10,0x00,0x00,0x00,0x20,0x00,0x01,0x02 };
struct dstar_header DstarHeader;
Packet.ConvertToDstarStruct(&DstarHeader);
Buffer->Set(tag, sizeof(tag));
Buffer->Append(Packet.GetStreamId());
Buffer->Append((uint8)0x80);
Buffer->Append((uint8 *)&DstarHeader, sizeof(struct dstar_header));
return true;
}
bool CDplusProtocol::EncodeDvFramePacket(const CDvFramePacket &Packet, CBuffer *Buffer) const
{
uint8 tag[] = { 0x1D,0x80,0x44,0x53,0x56,0x54,0x20,0x00,0x00,0x00,0x20,0x00,0x01,0x02 };
Buffer->Set(tag, sizeof(tag));
Buffer->Append(Packet.GetStreamId());
Buffer->Append((uint8)(Packet.GetPacketId() % 21));
Buffer->Append((uint8 *)Packet.GetAmbe(), AMBE_SIZE);
Buffer->Append((uint8 *)Packet.GetDvData(), DVDATA_SIZE);
return true;
}
bool CDplusProtocol::EncodeDvLastFramePacket(const CDvLastFramePacket &Packet, CBuffer *Buffer) const
{
uint8 tag1[] = { 0x20,0x80,0x44,0x53,0x56,0x54,0x20,0x00,0x81,0x00,0x20,0x00,0x01,0x02 };
uint8 tag2[] = { 0x55,0xC8,0x7A,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x25,0x1A,0xC6 };
Buffer->Set(tag1, sizeof(tag1));
Buffer->Append(Packet.GetStreamId());
Buffer->Append((uint8)((Packet.GetPacketId() % 21) | 0x40));
Buffer->Append(tag2, sizeof(tag2));
return true;
}
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