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135 lines
3.4 KiB
135 lines
3.4 KiB
5 years ago
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//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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//===========================================================================//
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#include "tier1/utlbuffer.h"
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#include "UDP_Socket.h"
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#include "NetChannel.h"
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#include "sm_protocol.h"
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#include "networksystem.h"
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//-----------------------------------------------------------------------------
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// Allocates memory for packets
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//-----------------------------------------------------------------------------
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static CUtlMemoryPool s_PacketBufferAlloc( NET_MAX_MESSAGE, 8, CUtlMemoryPool::GROW_SLOW );
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DEFINE_FIXEDSIZE_ALLOCATOR( CNetPacket, 32, CUtlMemoryPool::GROW_SLOW );
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//-----------------------------------------------------------------------------
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// Constructor, destructor
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//-----------------------------------------------------------------------------
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CNetPacket::CNetPacket()
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{
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m_pData = reinterpret_cast<byte*>( s_PacketBufferAlloc.Alloc() );
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m_nRefCount = 1;
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}
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CNetPacket::~CNetPacket()
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{
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s_PacketBufferAlloc.Free( m_pData );
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}
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void CNetPacket::AddRef()
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{
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++m_nRefCount;
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}
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void CNetPacket::Release()
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{
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if ( --m_nRefCount <= 0 )
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{
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delete this;
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}
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}
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bool UDP_ReceiveDatagram( CUDPSocket *pSocket, CNetPacket* pPacket )
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{
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Assert( pPacket );
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netadr_t packetFrom;
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CUtlBuffer buf( pPacket->m_pData, NET_MAX_MESSAGE );
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if ( pSocket->RecvFrom( packetFrom, buf ) )
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{
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pPacket->m_From = packetFrom;
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pPacket->m_nSizeInBytes = buf.TellPut();
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return true;
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}
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return false;
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}
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CNetPacket *UDP_GetPacket( CUDPSocket *pSocket )
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{
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CNetPacket *pPacket = new CNetPacket;
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// setup new packet
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pPacket->m_From.SetType( NA_IP );
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pPacket->m_From.Clear();
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pPacket->m_flReceivedTime = g_pNetworkSystemImp->GetTime();
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pPacket->m_pSource = pSocket;
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pPacket->m_nSizeInBytes = 0;
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pPacket->m_Message.SetDebugName("inpacket.message");
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// then check UDP data
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if ( !UDP_ReceiveDatagram( pSocket, pPacket ) )
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{
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delete pPacket;
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return NULL;
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}
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Assert( pPacket->m_nSizeInBytes );
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// prepare bitbuffer for reading packet with new size
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pPacket->m_Message.StartReading( pPacket->m_pData, pPacket->m_nSizeInBytes );
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return pPacket;
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}
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void UDP_ProcessSocket( CUDPSocket *pSocket, IConnectionlessPacketHandler *pHandler, ILookupChannel *pLookup )
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{
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CNetPacket *pPacket;
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Assert( pSocket );
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// Get datagrams from sockets
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while ( ( pPacket = UDP_GetPacket ( pSocket ) ) != NULL )
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{
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/*
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if ( Filter_ShouldDiscard ( pPacket->m_From ) ) // filterning is done by network layer
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{
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Filter_SendBan( pPacket->m_From ); // tell them we aren't listening...
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continue;
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}
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*/
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// Find the netchan it came from
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if ( *(unsigned int *)pPacket->m_pData == CONNECTIONLESS_HEADER )
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{
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g_pNetworkSystemImp->EnqueueConnectionlessNetworkPacket( pPacket, pHandler );
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}
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else
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{
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INetChannel *pNetChan = pLookup->FindNetChannel( pPacket->m_From );
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g_pNetworkSystemImp->EnqueueNetworkPacket( pPacket, static_cast<CNetChannel*>( pNetChan ) );
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}
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}
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}
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void UDP_ProcessConnectionlessPacket( CNetPacket *pPacket, IConnectionlessPacketHandler *pHandler )
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{
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// check for connectionless packet (0xffffffff) first
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Assert( *(unsigned int *)pPacket->m_pData == CONNECTIONLESS_HEADER );
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pPacket->m_Message.ReadLong(); // read the -1
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/*
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if ( net_showudp.GetInt() )
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{
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Msg("UDP <- %s: sz=%i OOB '%c'\n", info.m_pPacket->m_From.ToString(), pPacket->m_nSizeInBytes, pPacket->m_pData[4] );
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}
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*/
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pHandler->ProcessConnectionlessPacket( pPacket );
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}
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