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core.cpp
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core.cpp
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/*****************************************************************************
Copyright (c) 2001 - 2011, The Board of Trustees of the University of Illinois.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above
copyright notice, this list of conditions and the
following disclaimer.
* Redistributions in binary form must reproduce the
above copyright notice, this list of conditions
and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of the University of Illinois
nor the names of its contributors may be used to
endorse or promote products derived from this
software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/
/*****************************************************************************
written by
Yunhong Gu, last updated 02/28/2012
*****************************************************************************/
#ifndef WIN32
#include <unistd.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <cerrno>
#include <cstring>
#include <cstdlib>
#else
#include <winsock2.h>
#include <ws2tcpip.h>
#ifdef LEGACY_WIN32
#include <wspiapi.h>
#endif
#endif
#include <cmath>
#include <sstream>
#include "queue.h"
#include "core.h"
using namespace std;
CUDTUnited CUDT::s_UDTUnited;
const UDTSOCKET CUDT::INVALID_SOCK = -1;
const int CUDT::ERROR = -1;
const UDTSOCKET UDT::INVALID_SOCK = CUDT::INVALID_SOCK;
const int UDT::ERROR = CUDT::ERROR;
const int32_t CSeqNo::m_iSeqNoTH = 0x3FFFFFFF;
const int32_t CSeqNo::m_iMaxSeqNo = 0x7FFFFFFF;
const int32_t CAckNo::m_iMaxAckSeqNo = 0x7FFFFFFF;
const int32_t CMsgNo::m_iMsgNoTH = 0xFFFFFFF;
const int32_t CMsgNo::m_iMaxMsgNo = 0x1FFFFFFF;
const int CUDT::m_iVersion = 4;
const int CUDT::m_iSYNInterval = 10000;
const int CUDT::m_iSelfClockInterval = 64;
CUDT::CUDT()
{
m_pSndBuffer = NULL;
m_pRcvBuffer = NULL;
m_pSndLossList = NULL;
m_pRcvLossList = NULL;
m_pACKWindow = NULL;
m_pSndTimeWindow = NULL;
m_pRcvTimeWindow = NULL;
m_pSndQueue = NULL;
m_pRcvQueue = NULL;
m_pPeerAddr = NULL;
m_pSNode = NULL;
m_pRNode = NULL;
// Initilize mutex and condition variables
initSynch();
// Default UDT configurations
m_iMSS = 1500;
m_bSynSending = true;
m_bSynRecving = true;
m_iFlightFlagSize = 25600;
m_iSndBufSize = 8192;
m_iRcvBufSize = 8192; //Rcv buffer MUST NOT be bigger than Flight Flag size
m_Linger.l_onoff = 1;
m_Linger.l_linger = 180;
m_iUDPSndBufSize = 65536;
m_iUDPRcvBufSize = m_iRcvBufSize * m_iMSS;
m_iSockType = UDT_STREAM;
m_iIPversion = AF_INET;
m_bRendezvous = false;
m_iSndTimeOut = -1;
m_iRcvTimeOut = -1;
m_iConnectTimeOut = 3000;
m_iRendezvousConnectTimeOut = m_iConnectTimeOut * 10;
m_bReuseAddr = true;
m_llMaxBW = -1;
m_pCCFactory = new CCCFactory<CUDTCC>;
m_pCC = NULL;
m_pCache = NULL;
// Initial status
m_bOpened = false;
m_bListening = false;
m_bConnecting = false;
m_bConnected = false;
m_bClosing = false;
m_bShutdown = false;
m_bBroken = false;
m_bPeerHealth = true;
m_ullLingerExpiration = 0;
}
CUDT::CUDT(const CUDT& ancestor)
{
m_pSndBuffer = NULL;
m_pRcvBuffer = NULL;
m_pSndLossList = NULL;
m_pRcvLossList = NULL;
m_pACKWindow = NULL;
m_pSndTimeWindow = NULL;
m_pRcvTimeWindow = NULL;
m_pSndQueue = NULL;
m_pRcvQueue = NULL;
m_pPeerAddr = NULL;
m_pSNode = NULL;
m_pRNode = NULL;
// Initilize mutex and condition variables
initSynch();
// Default UDT configurations
m_iMSS = ancestor.m_iMSS;
m_bSynSending = ancestor.m_bSynSending;
m_bSynRecving = ancestor.m_bSynRecving;
m_iFlightFlagSize = ancestor.m_iFlightFlagSize;
m_iSndBufSize = ancestor.m_iSndBufSize;
m_iRcvBufSize = ancestor.m_iRcvBufSize;
m_Linger = ancestor.m_Linger;
m_iUDPSndBufSize = ancestor.m_iUDPSndBufSize;
m_iUDPRcvBufSize = ancestor.m_iUDPRcvBufSize;
m_iSockType = ancestor.m_iSockType;
m_iIPversion = ancestor.m_iIPversion;
m_bRendezvous = ancestor.m_bRendezvous;
m_iSndTimeOut = ancestor.m_iSndTimeOut;
m_iRcvTimeOut = ancestor.m_iRcvTimeOut;
m_bReuseAddr = true; // this must be true, because all accepted sockets shared the same port with the listener
m_llMaxBW = ancestor.m_llMaxBW;
m_pCCFactory = ancestor.m_pCCFactory->clone();
m_pCC = NULL;
m_pCache = ancestor.m_pCache;
// Initial status
m_bOpened = false;
m_bListening = false;
m_bConnecting = false;
m_bConnected = false;
m_bClosing = false;
m_bShutdown = false;
m_bBroken = false;
m_bPeerHealth = true;
m_ullLingerExpiration = 0;
}
CUDT::~CUDT()
{
// release mutex/condtion variables
destroySynch();
// destroy the data structures
delete m_pSndBuffer;
delete m_pRcvBuffer;
delete m_pSndLossList;
delete m_pRcvLossList;
delete m_pACKWindow;
delete m_pSndTimeWindow;
delete m_pRcvTimeWindow;
delete m_pCCFactory;
delete m_pCC;
delete m_pPeerAddr;
delete m_pSNode;
delete m_pRNode;
}
void CUDT::setOpt(UDTOpt optName, const void* optval, int)
{
if (m_bBroken || m_bClosing)
throw CUDTException(2, 1, 0);
std::lock_guard<std::mutex> cg(m_ConnectionLock);
std::lock_guard<std::mutex> sendguard(m_SendLock);
std::lock_guard<std::mutex> recvguard(m_RecvLock);
switch (optName)
{
case UDT_MSS:
if (m_bOpened)
throw CUDTException(5, 1, 0);
if (*(int*)optval < int(28 + CHandShake::m_iContentSize))
throw CUDTException(5, 3, 0);
m_iMSS = *(int*)optval;
// Packet size cannot be greater than UDP buffer size
if (m_iMSS > m_iUDPSndBufSize)
m_iMSS = m_iUDPSndBufSize;
if (m_iMSS > m_iUDPRcvBufSize)
m_iMSS = m_iUDPRcvBufSize;
break;
case UDT_SNDSYN:
m_bSynSending = *(bool *)optval;
break;
case UDT_RCVSYN:
m_bSynRecving = *(bool *)optval;
break;
case UDT_CC:
if (m_bConnecting || m_bConnected)
throw CUDTException(5, 1, 0);
if (NULL != m_pCCFactory)
delete m_pCCFactory;
m_pCCFactory = ((CCCVirtualFactory *)optval)->clone();
break;
case UDT_FC:
if (m_bConnecting || m_bConnected)
throw CUDTException(5, 2, 0);
if (*(int*)optval < 1)
throw CUDTException(5, 3);
// Mimimum recv flight flag size is 32 packets
if (*(int*)optval > 32)
m_iFlightFlagSize = *(int*)optval;
else
m_iFlightFlagSize = 32;
break;
case UDT_SNDBUF:
if (m_bOpened)
throw CUDTException(5, 1, 0);
if (*(int*)optval <= 0)
throw CUDTException(5, 3, 0);
m_iSndBufSize = *(int*)optval / (m_iMSS - 28);
break;
case UDT_RCVBUF:
if (m_bOpened)
throw CUDTException(5, 1, 0);
if (*(int*)optval <= 0)
throw CUDTException(5, 3, 0);
// Mimimum recv buffer size is 32 packets
if (*(int*)optval > (m_iMSS - 28) * 32)
m_iRcvBufSize = *(int*)optval / (m_iMSS - 28);
else
m_iRcvBufSize = 32;
// recv buffer MUST not be greater than FC size
if (m_iRcvBufSize > m_iFlightFlagSize)
m_iRcvBufSize = m_iFlightFlagSize;
break;
case UDT_LINGER:
m_Linger = *(linger*)optval;
break;
case UDP_SNDBUF:
if (m_bOpened)
throw CUDTException(5, 1, 0);
m_iUDPSndBufSize = *(int*)optval;
if (m_iUDPSndBufSize < m_iMSS)
m_iUDPSndBufSize = m_iMSS;
break;
case UDP_RCVBUF:
if (m_bOpened)
throw CUDTException(5, 1, 0);
m_iUDPRcvBufSize = *(int*)optval;
if (m_iUDPRcvBufSize < m_iMSS)
m_iUDPRcvBufSize = m_iMSS;
break;
case UDT_RENDEZVOUS:
if (m_bConnecting || m_bConnected)
throw CUDTException(5, 1, 0);
m_bRendezvous = *(bool *)optval;
break;
case UDT_SNDTIMEO:
m_iSndTimeOut = *(int*)optval;
break;
case UDT_RCVTIMEO:
m_iRcvTimeOut = *(int*)optval;
break;
case UDT_REUSEADDR:
if (m_bOpened)
throw CUDTException(5, 1, 0);
m_bReuseAddr = *(bool*)optval;
break;
case UDT_MAXBW:
m_llMaxBW = *(int64_t*)optval;
break;
case UDT_CONNECTTIMEO:
m_iConnectTimeOut = *(int*)optval;
break;
case UDT_RENDEZVOUSCONNECTTIMEO:
m_iRendezvousConnectTimeOut = *(int*)optval;
break;
default:
throw CUDTException(5, 0, 0);
}
}
void CUDT::getOpt(UDTOpt optName, void* optval, int& optlen)
{
std::lock_guard<std::mutex> cg(m_ConnectionLock);
switch (optName)
{
case UDT_MSS:
*(int*)optval = m_iMSS;
optlen = sizeof(int);
break;
case UDT_SNDSYN:
*(bool*)optval = m_bSynSending;
optlen = sizeof(bool);
break;
case UDT_RCVSYN:
*(bool*)optval = m_bSynRecving;
optlen = sizeof(bool);
break;
case UDT_CC:
if (!m_bOpened)
throw CUDTException(5, 5, 0);
*(CCC**)optval = m_pCC;
optlen = sizeof(CCC*);
break;
case UDT_FC:
*(int*)optval = m_iFlightFlagSize;
optlen = sizeof(int);
break;
case UDT_SNDBUF:
*(int*)optval = m_iSndBufSize * (m_iMSS - 28);
optlen = sizeof(int);
break;
case UDT_RCVBUF:
*(int*)optval = m_iRcvBufSize * (m_iMSS - 28);
optlen = sizeof(int);
break;
case UDT_LINGER:
if (optlen < (int)(sizeof(linger)))
throw CUDTException(5, 3, 0);
*(linger*)optval = m_Linger;
optlen = sizeof(linger);
break;
case UDP_SNDBUF:
*(int*)optval = m_iUDPSndBufSize;
optlen = sizeof(int);
break;
case UDP_RCVBUF:
*(int*)optval = m_iUDPRcvBufSize;
optlen = sizeof(int);
break;
case UDT_RENDEZVOUS:
*(bool *)optval = m_bRendezvous;
optlen = sizeof(bool);
break;
case UDT_SNDTIMEO:
*(int*)optval = m_iSndTimeOut;
optlen = sizeof(int);
break;
case UDT_RCVTIMEO:
*(int*)optval = m_iRcvTimeOut;
optlen = sizeof(int);
break;
case UDT_REUSEADDR:
*(bool *)optval = m_bReuseAddr;
optlen = sizeof(bool);
break;
case UDT_MAXBW:
*(int64_t*)optval = m_llMaxBW;
optlen = sizeof(int64_t);
break;
case UDT_STATE:
*(int32_t*)optval = s_UDTUnited.getStatus(m_SocketID);
optlen = sizeof(int32_t);
break;
case UDT_EVENT:
{
int32_t event = 0;
if (m_bBroken)
event |= UDT_EPOLL_ERR;
else
{
if (m_pRcvBuffer && (m_pRcvBuffer->getRcvDataSize() > 0))
event |= UDT_EPOLL_IN;
if (m_pSndBuffer && (m_iSndBufSize > m_pSndBuffer->getCurrBufSize()))
event |= UDT_EPOLL_OUT;
}
*(int32_t*)optval = event;
optlen = sizeof(int32_t);
break;
}
case UDT_SNDDATA:
if (m_pSndBuffer)
*(int32_t*)optval = m_pSndBuffer->getCurrBufSize();
else
*(int32_t*)optval = 0;
optlen = sizeof(int32_t);
break;
case UDT_RCVDATA:
if (m_pRcvBuffer)
*(int32_t*)optval = m_pRcvBuffer->getRcvDataSize();
else
*(int32_t*)optval = 0;
optlen = sizeof(int32_t);
break;
case UDT_CONNECTTIMEO:
*(int*)optval = m_iConnectTimeOut;
optlen = sizeof(int);
break;
case UDT_RENDEZVOUSCONNECTTIMEO:
*(int*)optval = m_iRendezvousConnectTimeOut;
optlen = sizeof(int);
break;
default:
throw CUDTException(5, 0, 0);
}
}
void CUDT::open()
{
std::lock_guard<std::mutex> cg(m_ConnectionLock);
// Initial sequence number, loss, acknowledgement, etc.
m_iPktSize = m_iMSS - 28;
m_iPayloadSize = m_iPktSize - CPacket::m_iPktHdrSize;
m_iEXPCount = 1;
m_iBandwidth = 1;
m_iDeliveryRate = 16;
m_iAckSeqNo = 0;
m_ullLastAckTime = 0;
// trace information
m_StartTime = CTimer::getTime();
m_llSentTotal = m_llRecvTotal = m_iSndLossTotal = m_iRcvLossTotal = m_iRetransTotal = m_iSentACKTotal = m_iRecvACKTotal = m_iSentNAKTotal = m_iRecvNAKTotal = 0;
m_LastSampleTime = CTimer::getTime();
m_llTraceSent = m_llTraceRecv = m_iTraceSndLoss = m_iTraceRcvLoss = m_iTraceRetrans = m_iSentACK = m_iRecvACK = m_iSentNAK = m_iRecvNAK = 0;
m_llSndDuration = m_llSndDurationTotal = 0;
// structures for queue
if (NULL == m_pSNode)
m_pSNode = new CSNode;
m_pSNode->m_pUDT = this;
m_pSNode->m_llTimeStamp = 1;
m_pSNode->m_iHeapLoc = -1;
if (NULL == m_pRNode)
m_pRNode = new CRNode;
m_pRNode->m_pUDT = this;
m_pRNode->m_llTimeStamp = 1;
m_pRNode->m_pPrev = m_pRNode->m_pNext = NULL;
m_pRNode->m_bOnList = false;
m_iRTT = 10 * m_iSYNInterval;
m_iRTTVar = m_iRTT >> 1;
m_ullCPUFrequency = CTimer::getCPUFrequency();
// set up the timers
m_ullSYNInt = m_iSYNInterval * m_ullCPUFrequency;
// set minimum NAK and EXP timeout to 100ms
m_ullMinNakInt = 300000 * m_ullCPUFrequency;
m_ullMinExpInt = 300000 * m_ullCPUFrequency;
m_ullACKInt = m_ullSYNInt;
m_ullNAKInt = m_ullMinNakInt;
uint64_t currtime;
CTimer::rdtsc(currtime);
m_ullLastRspTime = currtime;
m_ullNextACKTime = currtime + m_ullSYNInt;
m_ullNextNAKTime = currtime + m_ullNAKInt;
m_iPktCount = 0;
m_iLightACKCount = 1;
m_ullTargetTime = 0;
m_ullTimeDiff = 0;
// Now UDT is opened.
m_bOpened = true;
}
void CUDT::listen()
{
std::lock_guard<std::mutex> cg(m_ConnectionLock);
if (!m_bOpened)
throw CUDTException(5, 0, 0);
if (m_bConnecting || m_bConnected)
throw CUDTException(5, 2, 0);
// listen can be called more than once
if (m_bListening)
return;
// if there is already another socket listening on the same port
if (m_pRcvQueue->setListener(this) < 0)
throw CUDTException(5, 11, 0);
m_bListening = true;
}
void CUDT::connect(const sockaddr* serv_addr)
{
std::lock_guard<std::mutex> cg(m_ConnectionLock);
if (!m_bOpened)
throw CUDTException(5, 0, 0);
if (m_bListening)
throw CUDTException(5, 2, 0);
if (m_bConnecting || m_bConnected)
throw CUDTException(5, 2, 0);
// record peer/server address
delete m_pPeerAddr;
m_pPeerAddr = (AF_INET == m_iIPversion) ? (sockaddr*)new sockaddr_in : (sockaddr*)new sockaddr_in6;
memcpy(m_pPeerAddr, serv_addr, (AF_INET == m_iIPversion) ? sizeof(sockaddr_in) : sizeof(sockaddr_in6));
// register this socket in the rendezvous queue
// RendezevousQueue is used to temporarily store incoming handshake, non-rendezvous connections also require this function
uint64_t ttl = m_iConnectTimeOut * 1000ULL;
if (m_bRendezvous)
ttl = m_iRendezvousConnectTimeOut * 1000ULL;
ttl += CTimer::getTime();
m_pRcvQueue->registerConnector(m_SocketID, this, m_iIPversion, serv_addr, ttl);
// This is my current configurations
m_ConnReq.m_iVersion = m_iVersion;
m_ConnReq.m_iType = m_iSockType;
m_ConnReq.m_iMSS = m_iMSS;
m_ConnReq.m_iFlightFlagSize = (m_iRcvBufSize < m_iFlightFlagSize)? m_iRcvBufSize : m_iFlightFlagSize;
m_ConnReq.m_iReqType = (!m_bRendezvous) ? 1 : 0;
m_ConnReq.m_iID = m_SocketID;
CIPAddress::ntop(serv_addr, m_ConnReq.m_piPeerIP, m_iIPversion);
// Random Initial Sequence Number
srand((unsigned int)CTimer::getTime());
m_iISN = m_ConnReq.m_iISN = (int32_t)(CSeqNo::m_iMaxSeqNo * (double(rand()) / RAND_MAX));
m_iLastDecSeq = m_iISN - 1;
m_iSndLastAck = m_iISN;
m_iSndLastDataAck = m_iISN;
m_iSndCurrSeqNo = m_iISN - 1;
m_iSndLastAck2 = m_iISN;
m_ullSndLastAck2Time = CTimer::getTime();
// Inform the server my configurations.
CPacket request;
char* reqdata = new char [m_iPayloadSize];
request.pack(0, NULL, reqdata, m_iPayloadSize);
// ID = 0, connection request
request.m_iID = 0;
int hs_size = m_iPayloadSize;
m_ConnReq.serialize(reqdata, hs_size);
request.setLength(hs_size);
m_pSndQueue->sendto(serv_addr, request);
m_llLastReqTime = CTimer::getTime();
m_bConnecting = true;
// asynchronous connect, return immediately
if (!m_bSynRecving)
{
delete [] reqdata;
return;
}
// Wait for the negotiated configurations from the peer side.
CPacket response;
char* resdata = new char [m_iPayloadSize];
response.pack(0, NULL, resdata, m_iPayloadSize);
CUDTException e(0, 0);
while (!m_bClosing && m_bConnecting)
{
// avoid sending too many requests, at most 1 request per 250ms that
if (CTimer::getTime() - m_llLastReqTime > 250000)
{
m_ConnReq.serialize(reqdata, hs_size);
request.setLength(hs_size);
if (m_bRendezvous)
request.m_iID = m_ConnRes.m_iID;
m_pSndQueue->sendto(serv_addr, request);
m_llLastReqTime = CTimer::getTime();
}
response.setLength(m_iPayloadSize);
if (m_pRcvQueue->recvfrom(m_SocketID, response) > 0)
{
if (connect(response) <= 0)
break;
// new request/response should be sent out immediately on receving a response
m_llLastReqTime = 0;
}
if (CTimer::getTime() > ttl)
{
// timeout
e = CUDTException(1, 1, 0);
break;
}
}
if (!m_bConnected)
{
m_pRcvQueue->removeConnector(m_SocketID);
}
delete [] reqdata;
delete [] resdata;
if (e.getErrorCode() == 0)
{
if (m_bClosing) // if the socket is closed before connection...
e = CUDTException(1);
else if (1002 == m_ConnRes.m_iReqType) // connection request rejected
e = CUDTException(1, 2, 0);
else if ((!m_bRendezvous) && (m_iISN != m_ConnRes.m_iISN)) // secuity check
e = CUDTException(1, 4, 0);
}
if (e.getErrorCode() != 0)
throw e;
}
int CUDT::connect(const CPacket& response) throw ()
{
// this is the 2nd half of a connection request. If the connection is setup successfully this returns 0.
// returning -1 means there is an error.
// returning 1 or 2 means the connection is in process and needs more handshake
if (!m_bConnecting)
return -1;
if (m_bRendezvous && ((0 == response.getFlag()) || (1 == response.getType())) && (0 != m_ConnRes.m_iType))
{
//a data packet or a keep-alive packet comes, which means the peer side is already connected
// in this situation, the previously recorded response will be used
goto POST_CONNECT;
}
if ((1 != response.getFlag()) || (0 != response.getType()))
return -1;
m_ConnRes.deserialize(response.m_pcData, response.getLength());
if (m_bRendezvous)
{
// regular connect should NOT communicate with rendezvous connect
// rendezvous connect require 3-way handshake
if (1 == m_ConnRes.m_iReqType)
return -1;
if ((0 == m_ConnReq.m_iReqType) || (0 == m_ConnRes.m_iReqType))
{
m_ConnReq.m_iReqType = -1;
// the request time must be updated so that the next handshake can be sent out immediately.
m_llLastReqTime = 0;
return 1;
}
}
else
{
// set cookie
if (1 == m_ConnRes.m_iReqType)
{
m_ConnReq.m_iReqType = -1;
m_ConnReq.m_iCookie = m_ConnRes.m_iCookie;
m_llLastReqTime = 0;
return 1;
}
}
POST_CONNECT:
// Remove from rendezvous queue
m_pRcvQueue->removeConnector(m_SocketID);
// Re-configure according to the negotiated values.
m_iMSS = m_ConnRes.m_iMSS;
m_iFlowWindowSize = m_ConnRes.m_iFlightFlagSize;
m_iPktSize = m_iMSS - 28;
m_iPayloadSize = m_iPktSize - CPacket::m_iPktHdrSize;
m_iPeerISN = m_ConnRes.m_iISN;
m_iRcvLastAck = m_ConnRes.m_iISN;
m_iRcvLastAckAck = m_ConnRes.m_iISN;
m_iRcvCurrSeqNo = m_ConnRes.m_iISN - 1;
m_PeerID = m_ConnRes.m_iID;
memcpy(m_piSelfIP, m_ConnRes.m_piPeerIP, 16);
// Prepare all data structures
try
{
m_pSndBuffer = new CSndBuffer(32, m_iPayloadSize);
m_pRcvBuffer = new CRcvBuffer(&(m_pRcvQueue->m_UnitQueue), m_iRcvBufSize);
// after introducing lite ACK, the sndlosslist may not be cleared in time, so it requires twice space.
m_pSndLossList = new CSndLossList(m_iFlowWindowSize * 2);
m_pRcvLossList = new CRcvLossList(m_iFlightFlagSize);
m_pACKWindow = new CACKWindow(1024);
m_pRcvTimeWindow = new CPktTimeWindow(16, 64);
m_pSndTimeWindow = new CPktTimeWindow();
}
catch (...)
{
throw CUDTException(3, 2, 0);
}
CInfoBlock ib;
ib.m_iIPversion = m_iIPversion;
CInfoBlock::convert(m_pPeerAddr, m_iIPversion, ib.m_piIP);
if (m_pCache->lookup(&ib) >= 0)
{
m_iRTT = ib.m_iRTT;
m_iBandwidth = ib.m_iBandwidth;
}
m_pCC = m_pCCFactory->create();
m_pCC->m_UDT = m_SocketID;
m_pCC->setMSS(m_iMSS);
m_pCC->setMaxCWndSize(m_iFlowWindowSize);
m_pCC->setSndCurrSeqNo(m_iSndCurrSeqNo);
m_pCC->setRcvRate(m_iDeliveryRate);
m_pCC->setRTT(m_iRTT);
m_pCC->setBandwidth(m_iBandwidth);
m_pCC->init();
m_ullInterval = (uint64_t)(m_pCC->m_dPktSndPeriod * m_ullCPUFrequency);
m_dCongestionWindow = m_pCC->m_dCWndSize;
// And, I am connected too.
m_bConnecting = false;
m_bConnected = true;
// register this socket for receiving data packets
m_pRNode->m_bOnList = true;
m_pRcvQueue->setNewEntry(this);
// acknowledge the management module.
s_UDTUnited.connect_complete(m_SocketID);
// acknowledde any waiting epolls to write
s_UDTUnited.m_EPoll.update_events(m_SocketID, m_sPollID, UDT_EPOLL_OUT, true);
return 0;
}
void CUDT::connect(const sockaddr* peer, CHandShake* hs)
{
std::lock_guard<std::mutex> cg(m_ConnectionLock);
// Uses the smaller MSS between the peers
if (hs->m_iMSS > m_iMSS)
hs->m_iMSS = m_iMSS;
else
m_iMSS = hs->m_iMSS;
// exchange info for maximum flow window size
m_iFlowWindowSize = hs->m_iFlightFlagSize;
hs->m_iFlightFlagSize = (m_iRcvBufSize < m_iFlightFlagSize)? m_iRcvBufSize : m_iFlightFlagSize;
m_iPeerISN = hs->m_iISN;
m_iRcvLastAck = hs->m_iISN;
m_iRcvLastAckAck = hs->m_iISN;
m_iRcvCurrSeqNo = hs->m_iISN - 1;
m_PeerID = hs->m_iID;
hs->m_iID = m_SocketID;
// use peer's ISN and send it back for security check
m_iISN = hs->m_iISN;
m_iLastDecSeq = m_iISN - 1;
m_iSndLastAck = m_iISN;
m_iSndLastDataAck = m_iISN;
m_iSndCurrSeqNo = m_iISN - 1;
m_iSndLastAck2 = m_iISN;
m_ullSndLastAck2Time = CTimer::getTime();
// this is a reponse handshake
hs->m_iReqType = -1;
// get local IP address and send the peer its IP address (because UDP cannot get local IP address)
memcpy(m_piSelfIP, hs->m_piPeerIP, 16);
CIPAddress::ntop(peer, hs->m_piPeerIP, m_iIPversion);
m_iPktSize = m_iMSS - 28;
m_iPayloadSize = m_iPktSize - CPacket::m_iPktHdrSize;
// Prepare all structures
try
{
m_pSndBuffer = new CSndBuffer(32, m_iPayloadSize);
m_pRcvBuffer = new CRcvBuffer(&(m_pRcvQueue->m_UnitQueue), m_iRcvBufSize);
m_pSndLossList = new CSndLossList(m_iFlowWindowSize * 2);
m_pRcvLossList = new CRcvLossList(m_iFlightFlagSize);
m_pACKWindow = new CACKWindow(1024);
m_pRcvTimeWindow = new CPktTimeWindow(16, 64);
m_pSndTimeWindow = new CPktTimeWindow();
}
catch (...)
{
throw CUDTException(3, 2, 0);
}
CInfoBlock ib;
ib.m_iIPversion = m_iIPversion;
CInfoBlock::convert(peer, m_iIPversion, ib.m_piIP);
if (m_pCache->lookup(&ib) >= 0)
{
m_iRTT = ib.m_iRTT;
m_iBandwidth = ib.m_iBandwidth;
}
m_pCC = m_pCCFactory->create();
m_pCC->m_UDT = m_SocketID;
m_pCC->setMSS(m_iMSS);
m_pCC->setMaxCWndSize(m_iFlowWindowSize);
m_pCC->setSndCurrSeqNo(m_iSndCurrSeqNo);
m_pCC->setRcvRate(m_iDeliveryRate);
m_pCC->setRTT(m_iRTT);
m_pCC->setBandwidth(m_iBandwidth);
m_pCC->init();
m_ullInterval = (uint64_t)(m_pCC->m_dPktSndPeriod * m_ullCPUFrequency);
m_dCongestionWindow = m_pCC->m_dCWndSize;
m_pPeerAddr = (AF_INET == m_iIPversion) ? (sockaddr*)new sockaddr_in : (sockaddr*)new sockaddr_in6;
memcpy(m_pPeerAddr, peer, (AF_INET == m_iIPversion) ? sizeof(sockaddr_in) : sizeof(sockaddr_in6));
// And of course, it is connected.
m_bConnected = true;
// register this socket for receiving data packets
m_pRNode->m_bOnList = true;
m_pRcvQueue->setNewEntry(this);
//send the response to the peer, see listen() for more discussions about this
CPacket response;
int size = CHandShake::m_iContentSize;
char* buffer = new char[size];
hs->serialize(buffer, size);
response.pack(0, NULL, buffer, size);
response.m_iID = m_PeerID;
m_pSndQueue->sendto(peer, response);
delete [] buffer;
}
void CUDT::close()
{
if (!m_bOpened)
return;
if (0 != m_Linger.l_onoff)
{
uint64_t entertime = CTimer::getTime();
while (!m_bBroken && m_bConnected && (m_pSndBuffer->getCurrBufSize() > 0) && (CTimer::getTime() - entertime < m_Linger.l_linger * 1000000ULL))
{
// linger has been checked by previous close() call and has expired
if (m_ullLingerExpiration >= entertime)
break;
if (!m_bSynSending)
{
// if this socket enables asynchronous sending, return immediately and let GC to close it later
if (0 == m_ullLingerExpiration)
m_ullLingerExpiration = entertime + m_Linger.l_linger * 1000000ULL;
return;
}
#ifndef WIN32
timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = 1000000;
nanosleep(&ts, NULL);
#else
Sleep(1);
#endif
}
}
// remove this socket from the snd queue
if (m_bConnected)
m_pSndQueue->m_pSndUList->remove(this);
// trigger any pending IO events.
s_UDTUnited.m_EPoll.update_events(m_SocketID, m_sPollID, UDT_EPOLL_ERR, true);
// then remove itself from all epoll monitoring
try
{
for (set<int>::iterator i = m_sPollID.begin(); i != m_sPollID.end(); ++ i)
s_UDTUnited.m_EPoll.remove_usock(*i, m_SocketID);
}
catch (...)
{
}
if (!m_bOpened)
return;
// Inform the threads handler to stop.
m_bClosing = true;
std::lock_guard<std::mutex> cg(m_ConnectionLock);
// Signal the sender and recver if they are waiting for data.
releaseSynch();