api.cpp

udt.sdk.4.1.tar.gz更新包

/*****************************************************************************
Copyright (c) 2001 - 2007, 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 12/10/2007
*****************************************************************************/

#ifdef WIN32
   #include <winsock2.h>
   #include <ws2tcpip.h>
#else
   #include <unistd.h>
#endif
#include "api.h"
#include "core.h"

using namespace std;

CUDTSocket::CUDTSocket():
m_pSelfAddr(NULL),
m_pPeerAddr(NULL),
m_pUDT(NULL),
m_pQueuedSockets(NULL),
m_pAcceptSockets(NULL)
{
   #ifndef WIN32
      pthread_mutex_init(&m_AcceptLock, NULL);
      pthread_cond_init(&m_AcceptCond, NULL);
   #else
      m_AcceptLock = CreateMutex(NULL, false, NULL);
      m_AcceptCond = CreateEvent(NULL, false, false, NULL);
   #endif
}

CUDTSocket::~CUDTSocket()
{
   if (AF_INET == m_iIPversion)
   {
      if (m_pSelfAddr)
         delete (sockaddr_in*)m_pSelfAddr;
      if (m_pPeerAddr)
         delete (sockaddr_in*)m_pPeerAddr;
   }
   else
   {
      if (m_pSelfAddr)
         delete (sockaddr_in6*)m_pSelfAddr;
      if (m_pPeerAddr)
         delete (sockaddr_in6*)m_pPeerAddr;
   }

   if (m_pUDT)
      delete m_pUDT;

   if (m_pQueuedSockets)
      delete m_pQueuedSockets;
   if (m_pAcceptSockets)
      delete m_pAcceptSockets;

   #ifndef WIN32
      pthread_mutex_destroy(&m_AcceptLock);
      pthread_cond_destroy(&m_AcceptCond);
   #else
      CloseHandle(m_AcceptLock);
      CloseHandle(m_AcceptCond);
   #endif
}

////////////////////////////////////////////////////////////////////////////////

CUDTUnited::CUDTUnited()
{
   srand((unsigned int)CTimer::getTime());
   m_SocketID = 1 + (int)((1 << 30) * (rand()/(RAND_MAX + 1.0)));

   #ifndef WIN32
      pthread_mutex_init(&m_ControlLock, NULL);
      pthread_mutex_init(&m_IDLock, NULL);
   #else
      m_ControlLock = CreateMutex(NULL, false, NULL);
      m_IDLock = CreateMutex(NULL, false, NULL);
   #endif

   #ifndef WIN32
      pthread_key_create(&m_TLSError, TLSDestroy);
   #else
      m_TLSError = TlsAlloc();
   #endif

   // Global initialization code
   #ifdef WIN32
      WORD wVersionRequested;
      WSADATA wsaData;
      wVersionRequested = MAKEWORD(2, 2);

      if (0 != WSAStartup(wVersionRequested, &wsaData))
         throw CUDTException(1, 0,  WSAGetLastError());
   #endif

   m_vMultiplexer.clear();
   m_pController = new CControl;

   m_bClosing = false;
   #ifndef WIN32
      pthread_create(&m_GCThread, NULL, garbageCollect, this);
   #else
      DWORD ThreadID;
      m_GCThread = CreateThread(NULL, 0, garbageCollect, this, NULL, &ThreadID);
   #endif
}

CUDTUnited::~CUDTUnited()
{
   m_bClosing = true;
   #ifndef WIN32
      pthread_join(m_GCThread, NULL);
   #else
      WaitForSingleObject(m_GCThread, INFINITE);
   #endif

   #ifndef WIN32
      pthread_mutex_destroy(&m_ControlLock);
      pthread_mutex_destroy(&m_IDLock);
   #else
      CloseHandle(m_ControlLock);
      CloseHandle(m_IDLock);
   #endif

   #ifndef WIN32
      pthread_key_delete(m_TLSError);
   #else
      TlsFree(m_TLSError);
   #endif

   m_vMultiplexer.clear();
   delete m_pController;

   // Global destruction code
   #ifdef WIN32
      WSACleanup();
   #endif
}

UDTSOCKET CUDTUnited::newSocket(const int& af, const int& type)
{
   if ((type != SOCK_STREAM) && (type != SOCK_DGRAM))
      throw CUDTException(5, 3, 0);

   CUDTSocket* ns = NULL;

   try
   {
      ns = new CUDTSocket;
      ns->m_pUDT = new CUDT;
      if (AF_INET == af)
      {
         ns->m_pSelfAddr = (sockaddr*)(new sockaddr_in);
         ((sockaddr_in*)(ns->m_pSelfAddr))->sin_port = 0;
      }
      else
      {
         ns->m_pSelfAddr = (sockaddr*)(new sockaddr_in6);
         ((sockaddr_in6*)(ns->m_pSelfAddr))->sin6_port = 0;
      }
   }
   catch (...)
   {
      delete ns;
      throw CUDTException(3, 2, 0);
   }

   #ifndef WIN32
      pthread_mutex_lock(&m_IDLock);
   #else
      WaitForSingleObject(m_IDLock, INFINITE);
   #endif
   ns->m_SocketID = -- m_SocketID;
   #ifndef WIN32
      pthread_mutex_unlock(&m_IDLock);
   #else
      ReleaseMutex(m_IDLock);
   #endif

   ns->m_Status = CUDTSocket::INIT;
   ns->m_ListenSocket = 0;
   ns->m_pUDT->m_SocketID = ns->m_SocketID;
   ns->m_pUDT->m_iSockType = (SOCK_STREAM == type) ? UDT_STREAM : UDT_DGRAM;
   ns->m_pUDT->m_iIPversion = ns->m_iIPversion = af;
   ns->m_pUDT->m_pController = m_pController;

   // protect the m_Sockets structure.
   #ifndef WIN32
      pthread_mutex_lock(&m_ControlLock);
   #else
      WaitForSingleObject(m_ControlLock, INFINITE);
   #endif
   try
   {
      m_Sockets[ns->m_SocketID] = ns;
   }
   catch (...)
   {
      //failure and rollback
      delete ns;
      ns = NULL;
   }
   #ifndef WIN32
      pthread_mutex_unlock(&m_ControlLock);
   #else
      ReleaseMutex(m_ControlLock);
   #endif

   if (NULL == ns)
      throw CUDTException(3, 2, 0);

   return ns->m_SocketID;
}

int CUDTUnited::newConnection(const UDTSOCKET listen, const sockaddr* peer, CHandShake* hs)
{
   CUDTSocket* ns;
   CUDTSocket* ls = locate(listen);

   // if this connection has already been processed
   if (NULL != (ns = locate(listen, peer, hs->m_iID, hs->m_iISN)))
   {
      if (ns->m_pUDT->m_bBroken)
      {
         // last connection from the "peer" address has been broken
         ns->m_Status = CUDTSocket::CLOSED;
         ns->m_TimeStamp = CTimer::getTime();

         #ifndef WIN32
            pthread_mutex_lock(&(ls->m_AcceptLock));
         #else
            WaitForSingleObject(ls->m_AcceptLock, INFINITE);
         #endif
         ls->m_pQueuedSockets->erase(ns->m_SocketID);
         ls->m_pAcceptSockets->erase(ns->m_SocketID);
         #ifndef WIN32
            pthread_mutex_unlock(&(ls->m_AcceptLock));
         #else
            ReleaseMutex(ls->m_AcceptLock);
         #endif
      }
      else
      {
         // connection already exist, this is a repeated connection request
         // respond with existing HS information

         hs->m_iISN = ns->m_pUDT->m_iISN;
         hs->m_iMSS = ns->m_pUDT->m_iMSS;
         hs->m_iFlightFlagSize = ns->m_pUDT->m_iFlightFlagSize;
         hs->m_iReqType = -1;
         hs->m_iID = ns->m_SocketID;

         return 0;

         //except for this situation a new connection should be started
      }
   }

   // exceeding backlog, refuse the connection request
   if (ls->m_pQueuedSockets->size() >= ls->m_uiBackLog)
      return -1;

   try
   {
      ns = new CUDTSocket;
      ns->m_pUDT = new CUDT(*(ls->m_pUDT));
      if (AF_INET == ls->m_iIPversion)
      {
         ns->m_pSelfAddr = (sockaddr*)(new sockaddr_in);
         ((sockaddr_in*)(ns->m_pSelfAddr))->sin_port = 0;
         ns->m_pPeerAddr = (sockaddr*)(new sockaddr_in);
         memcpy(ns->m_pPeerAddr, peer, sizeof(sockaddr_in));
      }
      else
      {
         ns->m_pSelfAddr = (sockaddr*)(new sockaddr_in6);
         ((sockaddr_in6*)(ns->m_pSelfAddr))->sin6_port = 0;
         ns->m_pPeerAddr = (sockaddr*)(new sockaddr_in6);
         memcpy(ns->m_pPeerAddr, peer, sizeof(sockaddr_in6));
      }
   }
   catch (...)
   {
      delete ns;
      return -1;
   }

   #ifndef WIN32
      pthread_mutex_lock(&m_IDLock);
   #else
      WaitForSingleObject(m_IDLock, INFINITE);
   #endif
   ns->m_SocketID = -- m_SocketID;
   #ifndef WIN32
      pthread_mutex_unlock(&m_IDLock);
   #else
      ReleaseMutex(m_IDLock);
   #endif

   ns->m_ListenSocket = listen;
   ns->m_iIPversion = ls->m_iIPversion;
   ns->m_pUDT->m_SocketID = ns->m_SocketID;
   ns->m_PeerID = hs->m_iID;
   ns->m_iISN = hs->m_iISN;

   int error = 0;

   try
   {
      // bind to the same addr of listening socket
      ns->m_pUDT->open();
      updateMux(ns->m_pUDT, ls);
      ns->m_pUDT->connect(peer, hs);
   }
   catch (...)
   {
      error = 1;
      goto ERR_ROLLBACK;
   }

   ns->m_Status = CUDTSocket::CONNECTED;

   // copy address information of local node
   ns->m_pUDT->m_pSndQueue->m_pChannel->getSockAddr(ns->m_pSelfAddr);

   // protect the m_Sockets structure.
   #ifndef WIN32
      pthread_mutex_lock(&m_ControlLock);
   #else
      WaitForSingleObject(m_ControlLock, INFINITE);
   #endif
   try
   {
      m_Sockets[ns->m_SocketID] = ns;
   }
   catch (...)
   {
      error = 2;
   }
   #ifndef WIN32
      pthread_mutex_unlock(&m_ControlLock);
   #else
      ReleaseMutex(m_ControlLock);
   #endif

   #ifndef WIN32
      pthread_mutex_lock(&(ls->m_AcceptLock));
   #else
      WaitForSingleObject(ls->m_AcceptLock, INFINITE);
   #endif
   try
   {
      ls->m_pQueuedSockets->insert(ns->m_SocketID);
   }
   catch (...)
   {
      error = 3;
   }
   #ifndef WIN32
      pthread_mutex_unlock(&(ls->m_AcceptLock));
   #else
      ReleaseMutex(ls->m_AcceptLock);
   #endif

   CTimer::triggerEvent();

   ERR_ROLLBACK:
   if (error > 0)
   {
      ns->m_pUDT->close();
      if (error > 1)
         m_Sockets.erase(ns->m_SocketID);
      delete ns;

      return -1;
   }

   // wake up a waiting accept() call
   #ifndef WIN32
      pthread_cond_signal(&(ls->m_AcceptCond));
   #else
      SetEvent(ls->m_AcceptCond);
   #endif

   return 1;
}

CUDT* CUDTUnited::lookup(const UDTSOCKET u)
{
   // protects the m_Sockets structure
   CGuard cg(m_ControlLock);

   map<UDTSOCKET, CUDTSocket*>::iterator i = m_Sockets.find(u);

   if ((i == m_Sockets.end()) || (i->second->m_Status == CUDTSocket::CLOSED))
      throw CUDTException(5, 4, 0);

   return i->second->m_pUDT;
}

CUDTSocket::UDTSTATUS CUDTUnited::getStatus(const UDTSOCKET u)
{
   // protects the m_Sockets structure
   CGuard cg(m_ControlLock);

   map<UDTSOCKET, CUDTSocket*>::iterator i = m_Sockets.find(u);

   if (i == m_Sockets.end())
      return CUDTSocket::INIT;

   if (i->second->m_pUDT->m_bBroken)
      return CUDTSocket::BROKEN;

   return i->second->m_Status;   
}

int CUDTUnited::bind(const UDTSOCKET u, const sockaddr* name, const int& namelen)
{
   CUDTSocket* s = locate(u);

   if (NULL == s)
      throw CUDTException(5, 4, 0);

   // cannot bind a socket more than once
   if (CUDTSocket::INIT != s->m_Status)
      throw CUDTException(5, 0, 0);

   // check the size of SOCKADDR structure
   if (AF_INET == s->m_iIPversion)
   {
      if (namelen != sizeof(sockaddr_in))
         throw CUDTException(5, 3, 0);
   }
   else
   {
      if (namelen != sizeof(sockaddr_in6))
         throw CUDTException(5, 3, 0);
   }

   s->m_pUDT->open();
   updateMux(s->m_pUDT, name);
   s->m_Status = CUDTSocket::OPENED;

   // copy address information of local node
   s->m_pUDT->m_pSndQueue->m_pChannel->getSockAddr(s->m_pSelfAddr);

   return 0;
}

int CUDTUnited::listen(const UDTSOCKET u, const int& backlog)
{
   CUDTSocket* s = locate(u);

   if (NULL == s)
      throw CUDTException(5, 4, 0);

   // do nothing if the socket is already listening
   if (CUDTSocket::LISTENING == s->m_Status)
      return 0;

   // a socket can listen only if is in OPENED status
   if (CUDTSocket::OPENED != s->m_Status)
      throw CUDTException(5, 5, 0);

   // listen is not supported in rendezvous connection setup
   if (s->m_pUDT->m_bRendezvous)
      throw CUDTException(5, 7, 0);

   if (backlog <= 0)
      throw CUDTException(5, 3, 0);

   s->m_uiBackLog = backlog;

   try
   {
      s->m_pQueuedSockets = new set<UDTSOCKET>;
      s->m_pAcceptSockets = new set<UDTSOCKET>;
   }
   catch (...)
   {
      delete s->m_pQueuedSockets;
      throw CUDTException(3, 2, 0);
   }

   s->m_pUDT->listen();

   s->m_Status = CUDTSocket::LISTENING;

   return 0;
}

UDTSOCKET CUDTUnited::accept(const UDTSOCKET listen, sockaddr* addr, int* addrlen)
{
   if ((NULL != addr) && (NULL == addrlen))
      throw CUDTException(5, 3, 0);

   CUDTSocket* ls = locate(listen);

   if (ls == NULL)
      throw CUDTException(5, 4, 0);

   // the "listen" socket must be in LISTENING status
   if (CUDTSocket::LISTENING != ls->m_Status)
      throw CUDTException(5, 6, 0);

   // no "accept" in rendezvous connection setup
   if (ls->m_pUDT->m_bRendezvous)
      throw CUDTException(5, 7, 0);

   UDTSOCKET u = CUDT::INVALID_SOCK;
   bool accepted = false;

   // !!only one conection can be set up each time!!
   #ifndef WIN32
      while (!accepted)
      {
         pthread_mutex_lock(&(ls->m_AcceptLock));

         if (ls->m_pQueuedSockets->size() > 0)
         {
            u = *(ls->m_pQueuedSockets->begin());
            ls->m_pAcceptSockets->insert(ls->m_pAcceptSockets->end(), u);
            ls->m_pQueuedSockets->erase(ls->m_pQueuedSockets->begin());

            accepted = true;
         }
         else if (!ls->m_pUDT->m_bSynRecving)
            accepted = true;
         else if (CUDTSocket::LISTENING == ls->m_Status)
            pthread_cond_wait(&(ls->m_AcceptCond), &(ls->m_AcceptLock));

         if (CUDTSocket::LISTENING != ls->m_Status)
            accepted = true;

         pthread_mutex_unlock(&(ls->m_AcceptLock));
      }
   #else
      while (!accepted)
      {
         WaitForSingleObject(ls->m_AcceptLock, INFINITE);

         if (ls->m_pQueuedSockets->size() > 0)
         {
            u = *(ls->m_pQueuedSockets->begin());
            ls->m_pAcceptSockets->insert(ls->m_pAcceptSockets->end(), u);
            ls->m_pQueuedSockets->erase(ls->m_pQueuedSockets->begin());