ddnet/src/engine/shared/network_conn.cpp

354 lines
8.2 KiB
C++

/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
/* If you are missing that file, acquire a complete release at teeworlds.com. */
#include <base/system.h>
#include "config.h"
#include "network.h"
void CNetConnection::ResetStats()
{
mem_zero(&m_Stats, sizeof(m_Stats));
}
void CNetConnection::Reset()
{
m_Sequence = 0;
m_Ack = 0;
m_RemoteClosed = 0;
m_State = NET_CONNSTATE_OFFLINE;
m_LastSendTime = 0;
m_LastRecvTime = 0;
m_LastUpdateTime = 0;
m_Token = -1;
mem_zero(&m_PeerAddr, sizeof(m_PeerAddr));
m_Buffer.Init();
mem_zero(&m_Construct, sizeof(m_Construct));
}
const char *CNetConnection::ErrorString()
{
return m_ErrorString;
}
void CNetConnection::SetError(const char *pString)
{
str_copy(m_ErrorString, pString, sizeof(m_ErrorString));
}
void CNetConnection::Init(NETSOCKET Socket, bool BlockCloseMsg)
{
Reset();
ResetStats();
m_Socket = Socket;
m_BlockCloseMsg = BlockCloseMsg;
mem_zero(m_ErrorString, sizeof(m_ErrorString));
}
void CNetConnection::AckChunks(int Ack)
{
while(1)
{
CNetChunkResend *pResend = m_Buffer.First();
if(!pResend)
break;
if(CNetBase::IsSeqInBackroom(pResend->m_Sequence, Ack))
m_Buffer.PopFirst();
else
break;
}
}
void CNetConnection::SignalResend()
{
m_Construct.m_Flags |= NET_PACKETFLAG_RESEND;
}
int CNetConnection::Flush()
{
int NumChunks = m_Construct.m_NumChunks;
if(!NumChunks && !m_Construct.m_Flags)
return 0;
// send of the packets
m_Construct.m_Ack = m_Ack;
CNetBase::SendPacket(m_Socket, &m_PeerAddr, &m_Construct);
// update send times
m_LastSendTime = time_get();
// clear construct so we can start building a new package
mem_zero(&m_Construct, sizeof(m_Construct));
return NumChunks;
}
int CNetConnection::QueueChunkEx(int Flags, int DataSize, const void *pData, int Sequence)
{
unsigned char *pChunkData;
// check if we have space for it, if not, flush the connection
if(m_Construct.m_DataSize + DataSize + NET_MAX_CHUNKHEADERSIZE > (int)sizeof(m_Construct.m_aChunkData))
Flush();
// pack all the data
CNetChunkHeader Header;
Header.m_Flags = Flags;
Header.m_Size = DataSize;
Header.m_Sequence = Sequence;
pChunkData = &m_Construct.m_aChunkData[m_Construct.m_DataSize];
pChunkData = Header.Pack(pChunkData);
mem_copy(pChunkData, pData, DataSize);
pChunkData += DataSize;
//
m_Construct.m_NumChunks++;
m_Construct.m_DataSize = (int)(pChunkData-m_Construct.m_aChunkData);
// set packet flags aswell
if(Flags&NET_CHUNKFLAG_VITAL && !(Flags&NET_CHUNKFLAG_RESEND))
{
// save packet if we need to resend
CNetChunkResend *pResend = m_Buffer.Allocate(sizeof(CNetChunkResend)+DataSize);
if(pResend)
{
pResend->m_Sequence = Sequence;
pResend->m_Flags = Flags;
pResend->m_DataSize = DataSize;
pResend->m_pData = (unsigned char *)(pResend+1);
pResend->m_FirstSendTime = time_get();
pResend->m_LastSendTime = pResend->m_FirstSendTime;
mem_copy(pResend->m_pData, pData, DataSize);
}
else
{
// out of buffer
Disconnect("too weak connection (out of buffer)");
return -1;
}
}
return 0;
}
int CNetConnection::QueueChunk(int Flags, int DataSize, const void *pData)
{
if(Flags&NET_CHUNKFLAG_VITAL)
m_Sequence = (m_Sequence+1)%NET_MAX_SEQUENCE;
return QueueChunkEx(Flags, DataSize, pData, m_Sequence);
}
void CNetConnection::SendControl(int ControlMsg, const void *pExtra, int ExtraSize)
{
// send the control message
m_LastSendTime = time_get();
CNetBase::SendControlMsg(m_Socket, &m_PeerAddr, m_Ack, ControlMsg, pExtra, ExtraSize);
}
void CNetConnection::ResendChunk(CNetChunkResend *pResend)
{
QueueChunkEx(pResend->m_Flags|NET_CHUNKFLAG_RESEND, pResend->m_DataSize, pResend->m_pData, pResend->m_Sequence);
pResend->m_LastSendTime = time_get();
}
void CNetConnection::Resend()
{
for(CNetChunkResend *pResend = m_Buffer.First(); pResend; pResend = m_Buffer.Next(pResend))
ResendChunk(pResend);
}
int CNetConnection::Connect(NETADDR *pAddr)
{
if(State() != NET_CONNSTATE_OFFLINE)
return -1;
// init connection
Reset();
m_PeerAddr = *pAddr;
mem_zero(m_ErrorString, sizeof(m_ErrorString));
m_State = NET_CONNSTATE_CONNECT;
SendControl(NET_CTRLMSG_CONNECT, 0, 0);
return 0;
}
void CNetConnection::Disconnect(const char *pReason)
{
if(State() == NET_CONNSTATE_OFFLINE)
return;
if(m_RemoteClosed == 0)
{
if(pReason)
SendControl(NET_CTRLMSG_CLOSE, pReason, str_length(pReason)+1);
else
SendControl(NET_CTRLMSG_CLOSE, 0, 0);
m_ErrorString[0] = 0;
if(pReason)
str_copy(m_ErrorString, pReason, sizeof(m_ErrorString));
}
Reset();
}
int CNetConnection::Feed(CNetPacketConstruct *pPacket, NETADDR *pAddr)
{
int64 Now = time_get();
// check if resend is requested
if(pPacket->m_Flags&NET_PACKETFLAG_RESEND)
Resend();
//
if(pPacket->m_Flags&NET_PACKETFLAG_CONTROL)
{
int CtrlMsg = pPacket->m_aChunkData[0];
if(CtrlMsg == NET_CTRLMSG_CLOSE)
{
if(net_addr_comp(&m_PeerAddr, pAddr) == 0)
{
m_State = NET_CONNSTATE_ERROR;
m_RemoteClosed = 1;
if(!m_BlockCloseMsg)
{
if(pPacket->m_DataSize)
{
// make sure to sanitize the error string form the other party
char Str[128];
if(pPacket->m_DataSize < 128)
str_copy(Str, (char *)pPacket->m_aChunkData, pPacket->m_DataSize);
else
str_copy(Str, (char *)pPacket->m_aChunkData, sizeof(Str));
str_sanitize_strong(Str);
// set the error string
SetError(Str);
}
else
SetError("No reason given");
}
if(g_Config.m_Debug)
dbg_msg("conn", "closed reason='%s'", ErrorString());
}
return 0;
}
else
{
if(State() == NET_CONNSTATE_OFFLINE)
{
if(CtrlMsg == NET_CTRLMSG_CONNECT)
{
// send response and init connection
Reset();
m_State = NET_CONNSTATE_PENDING;
m_PeerAddr = *pAddr;
m_LastSendTime = Now;
m_LastRecvTime = Now;
m_LastUpdateTime = Now;
SendControl(NET_CTRLMSG_CONNECTACCEPT, 0, 0);
if(g_Config.m_Debug)
dbg_msg("connection", "got connection, sending connect+accept");
}
}
else if(State() == NET_CONNSTATE_CONNECT)
{
// connection made
if(CtrlMsg == NET_CTRLMSG_CONNECTACCEPT)
{
m_LastRecvTime = Now;
SendControl(NET_CTRLMSG_ACCEPT, 0, 0);
m_State = NET_CONNSTATE_ONLINE;
if(g_Config.m_Debug)
dbg_msg("connection", "got connect+accept, sending accept. connection online");
}
}
}
}
else
{
if(State() == NET_CONNSTATE_PENDING)
{
m_LastRecvTime = Now;
m_State = NET_CONNSTATE_ONLINE;
if(g_Config.m_Debug)
dbg_msg("connection", "connecting online");
}
}
if(State() == NET_CONNSTATE_ONLINE)
{
m_LastRecvTime = Now;
AckChunks(pPacket->m_Ack);
}
return 1;
}
int CNetConnection::Update()
{
int64 Now = time_get();
if(State() == NET_CONNSTATE_OFFLINE || State() == NET_CONNSTATE_ERROR)
return 0;
// check for timeout
if(State() != NET_CONNSTATE_OFFLINE &&
State() != NET_CONNSTATE_CONNECT &&
(Now-m_LastRecvTime) > time_freq()*10)
{
m_State = NET_CONNSTATE_ERROR;
SetError("Timeout");
}
// fix resends
if(m_Buffer.First())
{
CNetChunkResend *pResend = m_Buffer.First();
// check if we have some really old stuff laying around and abort if not acked
if(Now-pResend->m_FirstSendTime > time_freq()*10)
{
m_State = NET_CONNSTATE_ERROR;
SetError("Too weak connection (not acked for 10 seconds)");
}
else
{
// resend packet if we havn't got it acked in 1 second
if(Now-pResend->m_LastSendTime > time_freq())
ResendChunk(pResend);
}
}
// send keep alives if nothing has happend for 250ms
if(State() == NET_CONNSTATE_ONLINE)
{
if(time_get()-m_LastSendTime > time_freq()/2) // flush connection after 500ms if needed
{
int NumFlushedChunks = Flush();
if(NumFlushedChunks && g_Config.m_Debug)
dbg_msg("connection", "flushed connection due to timeout. %d chunks.", NumFlushedChunks);
}
if(time_get()-m_LastSendTime > time_freq())
SendControl(NET_CTRLMSG_KEEPALIVE, 0, 0);
}
else if(State() == NET_CONNSTATE_CONNECT)
{
if(time_get()-m_LastSendTime > time_freq()/2) // send a new connect every 500ms
SendControl(NET_CTRLMSG_CONNECT, 0, 0);
}
else if(State() == NET_CONNSTATE_PENDING)
{
if(time_get()-m_LastSendTime > time_freq()/2) // send a new connect/accept every 500ms
SendControl(NET_CTRLMSG_CONNECTACCEPT, 0, 0);
}
return 0;
}