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xlxd/src/cdextraprotocol.cpp

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//
// cdextraprotocol.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 "cdextraclient.h"
#include "cdextraprotocol.h"
#include "creflector.h"
#include "cgatekeeper.h"
////////////////////////////////////////////////////////////////////////////////////////
// operation
bool CDextraProtocol::Init(void)
{
bool ok;
// base class
ok = CProtocol::Init();
// update the reflector callsign
m_ReflectorCallsign.PatchCallsign(0, (const uint8 *)"XRF", 3);
// create our socket
ok &= m_Socket.Open(DEXTRA_PORT);
// update time
m_LastKeepaliveTime.Now();
// done
return ok;
}
////////////////////////////////////////////////////////////////////////////////////////
// task
void CDextraProtocol::Task(void)
{
CBuffer Buffer;
CIp Ip;
CCallsign Callsign;
char ToLinkModule;
CDvHeaderPacket *Header;
CDvFramePacket *Frame;
CDvLastFramePacket *LastFrame;
// any incoming packet ?
if ( m_Socket.Receive(&Buffer, &Ip, 20) != -1 )
{
// crack the packet
if ( (Frame = IsValidDvFramePacket(Buffer)) != NULL )
{
//std::cout << "DExtra DV frame" << std::endl;
// handle it
OnDvFramePacketIn(Frame);
}
else if ( (Header = IsValidDvHeaderPacket(Buffer)) != NULL )
{
//std::cout << "DExtra DV header:" << std::endl << *Header << std::endl;
// callsign muted?
if ( g_GateKeeper.MayTransmit(Header->GetMyCallsign(), Ip, PROTOCOL_DEXTRA) )
{
// handle it
OnDvHeaderPacketIn(Header, Ip);
}
else
{
delete Header;
}
}
else if ( (LastFrame = IsValidDvLastFramePacket(Buffer)) != NULL )
{
//std::cout << "DExtra DV last frame" << std::endl;
// handle it
OnDvLastFramePacketIn(LastFrame);
}
else if ( IsValidConnectPacket(Buffer, &Callsign, &ToLinkModule) )
{
std::cout << "DExtra connect packet for module " << ToLinkModule << " from " << Callsign << " at " << Ip << std::endl;
// callsign authorized?
if ( g_GateKeeper.MayLink(Callsign, Ip, PROTOCOL_DEXTRA) )
{
// acknowledge the request
EncodeConnectAckPacket(&Buffer);
m_Socket.Send(Buffer, Ip);
// create the client
CDextraClient *client = new CDextraClient(Callsign, Ip, ToLinkModule);
// and append
g_Reflector.GetClients()->AddClient(client);
g_Reflector.ReleaseClients();
}
else
{
// deny the request
EncodeConnectNackPacket(&Buffer);
m_Socket.Send(Buffer, Ip);
}
}
else if ( IsValidDisconnectPacket(Buffer, &Callsign) )
{
std::cout << "DExtra disconnect packet from " << Callsign << " at " << Ip << std::endl;
// find client & remove it
CClients *clients = g_Reflector.GetClients();
CClient *client = clients->FindClient(Callsign, Ip, PROTOCOL_DEXTRA);
if ( client != NULL )
{
clients->RemoveClient(client);
}
g_Reflector.ReleaseClients();
}
else if ( IsValidKeepAlivePacket(Buffer, &Callsign) )
{
//std::cout << "DExtra keepalive packet from " << Callsign << " at " << Ip << std::endl;
// find client & keep it alive
CClient *GetClient(const CCallsign &, const CIp &, char, int);
CClient *client = g_Reflector.GetClients()->FindClient(Callsign, Ip, PROTOCOL_DEXTRA);
if ( client != NULL )
{
client->Alive();
}
g_Reflector.ReleaseClients();
}
else
{
std::cout << "DExtra packet (" << Buffer.size() << ")" << std::endl;
}
}
// handle end of streaming timeout
CheckStreamsTimeout();
// handle queue from reflector
HandleQueue();
// keep client alive
if ( m_LastKeepaliveTime.DurationSinceNow() > DEXTRA_KEEPALIVE_PERIOD )
{
// DExtra protocol sends and monitors keepalives packets
// event if the client is currently streaming
// so, send keepalives to all
CBuffer keepalive;
EncodeKeepAlivePacket(&keepalive);
// iterate on clients
CClients *clients = g_Reflector.GetClients();
int index = -1;
CClient *client = NULL;
while ( (client = clients->FindNextClient(PROTOCOL_DEXTRA, &index)) != NULL )
{
// send keepalive
m_Socket.Send(keepalive, client->GetIp());
// client busy ?
if ( client->IsAMaster() )
{
// yes, just tickle it
client->Alive();
}
// otherwise check if still with us
else if ( !client->IsAlive() )
{
// no, disconnect
CBuffer disconnect;
EncodeDisconnectPacket(&disconnect);
m_Socket.Send(disconnect, client->GetIp());
// remove it
std::cout << "DExtra client " << client->GetCallsign() << " keepalive timeout" << std::endl;
clients->RemoveClient(client);
}
}
g_Reflector.ReleaseClients();
// update time
m_LastKeepaliveTime.Now();
}
}
////////////////////////////////////////////////////////////////////////////////////////
// queue helper
void CDextraProtocol::HandleQueue(void)
{
m_Queue.Lock();
while ( !m_Queue.empty() )
{
// get the packet
CPacket *packet = m_Queue.front();
m_Queue.pop();
// encode it
CBuffer buffer;
if ( EncodeDvPacket(*packet, &buffer) )
{
// and push it to all our clients linked to the module and who are not streaming in
CClients *clients = g_Reflector.GetClients();
int index = -1;
CClient *client = NULL;
while ( (client = clients->FindNextClient(PROTOCOL_DEXTRA, &index)) != NULL )
{
// is this client busy ?
if ( !client->IsAMaster() && (client->GetReflectorModule() == packet->GetModuleId()) )
{
// no, send the packet
m_Socket.Send(buffer, client->GetIp());
}
}
g_Reflector.ReleaseClients();
}
// done
delete packet;
}
m_Queue.Unlock();
}
////////////////////////////////////////////////////////////////////////////////////////
// streams helpers
bool CDextraProtocol::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
// find this client
CClient *client = g_Reflector.GetClients()->FindClient(Ip, PROTOCOL_DEXTRA);
if ( client != NULL )
{
// 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();
}
else
{
// stream already open
// skip packet, but tickle the stream
stream->Tickle();
}
// update last heard
g_Reflector.GetUsers()->Hearing(Header->GetMyCallsign(), Header->GetRpt1Callsign());
g_Reflector.ReleaseUsers();
// done
return newstream;
}
////////////////////////////////////////////////////////////////////////////////////////
// packet decoding helpers
bool CDextraProtocol::IsValidConnectPacket(const CBuffer &Buffer, CCallsign *callsign, char *reflectormodule)
{
bool valid = false;
if ((Buffer.size() == 11) && (Buffer.data()[9] != ' '))
{
callsign->SetCallsign(Buffer.data(), 8);
callsign->SetModule(Buffer.data()[8]);
*reflectormodule = Buffer.data()[9];
valid = (callsign->IsValid() && std::isupper(*reflectormodule));
}
return valid;
}
bool CDextraProtocol::IsValidDisconnectPacket(const CBuffer &Buffer, CCallsign *callsign)
{
bool valid = false;
if ((Buffer.size() == 11) && (Buffer.data()[9] == ' '))
{
callsign->SetCallsign(Buffer.data(), 8);
callsign->SetModule(Buffer.data()[8]);
valid = callsign->IsValid();
}
return valid;
}
bool CDextraProtocol::IsValidKeepAlivePacket(const CBuffer &Buffer, CCallsign *callsign)
{
bool valid = false;
if (Buffer.size() == 9)
{
callsign->SetCallsign(Buffer.data(), 8);
valid = callsign->IsValid();
}
return valid;
}
CDvHeaderPacket *CDextraProtocol::IsValidDvHeaderPacket(const CBuffer &Buffer)
{
CDvHeaderPacket *header = NULL;
if ( (Buffer.size() == 56) && (Buffer.Compare((uint8 *)"DSVT", 4) == 0) &&
(Buffer.data()[4] == 0x10) && (Buffer.data()[8] == 0x20) )
{
// create packet
header = new CDvHeaderPacket((struct dstar_header *)&(Buffer.data()[15]),
*((uint16 *)&(Buffer.data()[12])), 0x80);
// check validity of packet
if ( !header->IsValid() )
{
delete header;
header = NULL;
}
}
return header;
}
CDvFramePacket *CDextraProtocol::IsValidDvFramePacket(const CBuffer &Buffer)
{
CDvFramePacket *dvframe = NULL;
if ( (Buffer.size() == 27) && (Buffer.Compare((uint8 *)"DSVT", 4) == 0) &&
(Buffer.data()[4] == 0x20) && (Buffer.data()[8] == 0x20) &&
((Buffer.data()[14] & 0x40) == 0) )
{
// create packet
dvframe = new CDvFramePacket((struct dstar_dvframe *)&(Buffer.data()[15]),
*((uint16 *)&(Buffer.data()[12])), Buffer.data()[14]);
// check validity of packet
if ( !dvframe->IsValid() )
{
delete dvframe;
dvframe = NULL;
}
}
return dvframe;
}
CDvLastFramePacket *CDextraProtocol::IsValidDvLastFramePacket(const CBuffer &Buffer)
{
CDvLastFramePacket *dvframe = NULL;
if ( (Buffer.size() == 27) && (Buffer.Compare((uint8 *)"DSVT", 4) == 0) &&
(Buffer.data()[4] == 0x20) && (Buffer.data()[8] == 0x20) &&
((Buffer.data()[14] & 0x40) != 0) )
{
// create packet
dvframe = new CDvLastFramePacket((struct dstar_dvframe *)&(Buffer.data()[15]),
*((uint16 *)&(Buffer.data()[12])), Buffer.data()[14]);
// check validity of packet
if ( !dvframe->IsValid() )
{
delete dvframe;
dvframe = NULL;
}
}
return dvframe;
}
////////////////////////////////////////////////////////////////////////////////////////
// packet encoding helpers
void CDextraProtocol::EncodeKeepAlivePacket(CBuffer *Buffer)
{
Buffer->Set(GetReflectorCallsign());
}
void CDextraProtocol::EncodeConnectAckPacket(CBuffer *Buffer)
{
uint8 tag[] = { 'A','C','K',0 };
Buffer->resize(Buffer->size()-1);
Buffer->Append(tag, sizeof(tag));
}
void CDextraProtocol::EncodeConnectNackPacket(CBuffer *Buffer)
{
uint8 tag[] = { 'N','A','K',0 };
Buffer->resize(Buffer->size()-1);
Buffer->Append(tag, sizeof(tag));
}
void CDextraProtocol::EncodeDisconnectPacket(CBuffer *Buffer)
{
uint8 tag[] = { ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',0 };
Buffer->Set(tag, sizeof(tag));
}
bool CDextraProtocol::EncodeDvHeaderPacket(const CDvHeaderPacket &Packet, CBuffer *Buffer) const
{
uint8 tag[] = { 'D','S','V','T',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 CDextraProtocol::EncodeDvFramePacket(const CDvFramePacket &Packet, CBuffer *Buffer) const
{
uint8 tag[] = { 'D','S','V','T',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 CDextraProtocol::EncodeDvLastFramePacket(const CDvLastFramePacket &Packet, CBuffer *Buffer) const
{
uint8 tag1[] = { 'D','S','V','T',0x20,0x00,0x00,0x00,0x20,0x00,0x01,0x02 };
uint8 tag2[] = { 0x55,0xC8,0x7A,0x00,0x00,0x00,0x00,0x00,0x00,0x25,0x1A,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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