winsock.cxx

开源代码的pwlib的1.10.0版本,使用openh323的1.18.0版本毕备

  switch (selerr) {
    case 1 :
      if (writefds.IsPresent(os_handle)) {
        // The following is to avoid a bug in Win32 sockets. The getpeername() function doesn't
        // work for some period of time after a connect, saying it is not connected yet!
        for (PINDEX failsafe = 0; failsafe < 1000; failsafe++) {
          sockaddr_in address;
          int sz = sizeof(address);
          if (::getpeername(os_handle, (struct sockaddr *)&address, &sz) == 0) {
            if (address.sin_port != 0)
              break;
          }
          ::Sleep(0);
        }

        err = 0;
      }
      else {
        // The following is to avoid a bug in Win32 sockets. The getsockopt() function
        // doesn't work for some period of time after a connect, saying no error!
        for (PINDEX failsafe = 0; failsafe < 1000; failsafe++) {
          int sz = sizeof(err);
          if (::getsockopt(os_handle, SOL_SOCKET, SO_ERROR, (char *)&err, &sz) == 0) {
            if (err != 0)
              break;
          }
          ::Sleep(0);
        }
        if (err == 0)
          err = WSAEFAULT; // Need to have something!
      }
      break;

    case 0 :
      err = WSAETIMEDOUT;
      break;

    default :
      err = GetLastError();
  }

  if (::ioctlsocket(os_handle, FIONBIO, &fionbio) == SOCKET_ERROR) {
    if (err == 0)
      err = GetLastError();
  }

  SetLastError(err);
  return ConvertOSError(err == 0 ? 0 : SOCKET_ERROR);
}


BOOL PSocket::os_accept(PSocket & listener, struct sockaddr * addr, int * size)
{
  if (listener.GetReadTimeout() != PMaxTimeInterval) {
    P_fd_set readfds = listener.GetHandle();
    P_timeval tv = listener.GetReadTimeout();
    switch (select(0, readfds, NULL, NULL, tv)) {
      case 1 :
        break;
      case 0 :
        SetLastError(WSAETIMEDOUT);
        // Then return -1
      default :
        return ConvertOSError(-1);
    }
  }
  return ConvertOSError(os_handle = ::accept(listener.GetHandle(), addr, size));
}


BOOL PSocket::os_recvfrom(void * buf,
                          PINDEX len,
                          int flags,
                          struct sockaddr * from,
                          PINDEX * fromlen)
{
  lastReadCount = 0;

  if (readTimeout != PMaxTimeInterval) {
    DWORD available;
    if (!ConvertOSError(ioctlsocket(os_handle, FIONREAD, &available), LastReadError))
      return FALSE;

    if (available == 0) {
      P_fd_set readfds = os_handle;
      P_timeval tv = readTimeout;
      int selval = ::select(0, readfds, NULL, NULL, tv);
      if (!ConvertOSError(selval, LastReadError))
        return FALSE;

      if (selval == 0)
        return SetErrorValues(Timeout, EAGAIN, LastReadError);

      if (!ConvertOSError(ioctlsocket(os_handle, FIONREAD, &available), LastReadError))
        return FALSE;
    }

    if (available > 0 && len > (PINDEX)available)
      len = available;
  }

  int recvResult = ::recvfrom(os_handle, (char *)buf, len, flags, from, fromlen);
  if (!ConvertOSError(recvResult, LastReadError))
    return FALSE;

  lastReadCount = recvResult;
  return TRUE;
}


BOOL PSocket::os_sendto(const void * buf,
                        PINDEX len,
                        int flags,
                        struct sockaddr * to,
                        PINDEX tolen)
{
  lastWriteCount = 0;

  if (writeTimeout != PMaxTimeInterval) {
    P_fd_set writefds = os_handle;
    P_timeval tv = writeTimeout;
    int selval = ::select(0, NULL, writefds, NULL, tv);
    if (selval < 0)
      return FALSE;

    if (selval == 0) {
#ifndef _WIN32_WCE
      errno = EAGAIN;
#else
      SetLastError(EAGAIN);
#endif
      return FALSE;
    }
  }

  int sendResult = ::sendto(os_handle, (const char *)buf, len, flags, to, tolen);
  if (!ConvertOSError(sendResult, LastWriteError))
    return FALSE;

  if (sendResult == 0)
    return FALSE;

  lastWriteCount = sendResult;
  return TRUE;
}


PChannel::Errors PSocket::Select(SelectList & read,
                                 SelectList & write,
                                 SelectList & except,
                                 const PTimeInterval & timeout)
{
  PINDEX i;

  P_fd_set readfds;
  for (i = 0; i < read.GetSize(); i++) {
    if (!read[i].IsOpen())
      return NotOpen;
    readfds += read[i].GetHandle();
  }

  P_fd_set writefds;
  for (i = 0; i < write.GetSize(); i++) {
    if (!write[i].IsOpen())
      return NotOpen;
    writefds += write[i].GetHandle();
  }

  P_fd_set exceptfds;
  for (i = 0; i < except.GetSize(); i++) {
    if (!except[i].IsOpen())
      return NotOpen;
    exceptfds += except[i].GetHandle();
  }

  P_timeval tval = timeout;
  int retval = select(INT_MAX, readfds, writefds, exceptfds, tval);

  Errors lastError;
  int osError;
  if (!ConvertOSError(retval, lastError, osError))
    return lastError;

  if (retval > 0) {
    for (i = 0; i < read.GetSize(); i++) {
      int h = read[i].GetHandle();
      if (h < 0)
        return Interrupted;
      if (!readfds.IsPresent(h))
        read.RemoveAt(i--);
    }
    for (i = 0; i < write.GetSize(); i++) {
      int h = write[i].GetHandle();
      if (h < 0)
        return Interrupted;
      if (!writefds.IsPresent(h))
        write.RemoveAt(i--);
    }
    for (i = 0; i < except.GetSize(); i++) {
      int h = except[i].GetHandle();
      if (h < 0)
        return Interrupted;
      if (!exceptfds.IsPresent(h))
        except.RemoveAt(i--);
    }
  }
  else {
    read.RemoveAll();
    write.RemoveAll();
    except.RemoveAll();
  }

  return NoError;
}


BOOL PSocket::ConvertOSError(int status, ErrorGroup group)
{
  Errors lastError;
  int osError;
  BOOL ok = ConvertOSError(status, lastError, osError);
  SetErrorValues(lastError, osError, group);
  return ok;
}


BOOL PSocket::ConvertOSError(int status, Errors & lastError, int & osError)
{
  if (status >= 0) {
    lastError = NoError;
    osError = 0;
    return TRUE;
  }

#ifdef _WIN32
  SetLastError(WSAGetLastError());
  return PChannel::ConvertOSError(-2, lastError, osError);
#else
  osError = WSAGetLastError();
  switch (osError) {
    case 0 :
      lastError = NoError;
      return TRUE;
    case WSAEWOULDBLOCK :
      lastError = Timeout;
      break;
    default :
      osError |= PWIN32ErrorFlag;
      lastError = Miscellaneous;
  }
  return FALSE;
#endif
}


//////////////////////////////////////////////////////////////////////////////
// PIPSocket::Address

PIPSocket::Address::Address(BYTE b1, BYTE b2, BYTE b3, BYTE b4)
{
  version = 4;
  v.four.S_un.S_un_b.s_b1 = b1;
  v.four.S_un.S_un_b.s_b2 = b2;
  v.four.S_un.S_un_b.s_b3 = b3;
  v.four.S_un.S_un_b.s_b4 = b4;
}


PIPSocket::Address::Address(DWORD dw)
{
  operator=(dw);
}


PIPSocket::Address & PIPSocket::Address::operator=(DWORD dw)
{
  if (dw == 0) {
    version = 0;
    memset(&v, 0, sizeof(v));
  }
  else {
    version = 4;
    v.four.S_un.S_addr = dw;
  }
  return *this;
}


PIPSocket::Address::operator DWORD() const
{
  return version != 4 ? 0 : v.four.S_un.S_addr;
}


BYTE PIPSocket::Address::Byte1() const
{
  return v.four.S_un.S_un_b.s_b1;
}


BYTE PIPSocket::Address::Byte2() const
{
  return v.four.S_un.S_un_b.s_b2;
}


BYTE PIPSocket::Address::Byte3() const
{
  return v.four.S_un.S_un_b.s_b3;
}


BYTE PIPSocket::Address::Byte4() const
{
  return v.four.S_un.S_un_b.s_b4;
}


//////////////////////////////////////////////////////////////////////////////
// PIPSocket

BOOL P_IsOldWin95()
{
  static int state = -1;
  if (state < 0) {
    state = 1;
    OSVERSIONINFO info;
    info.dwOSVersionInfoSize = sizeof(info);
    if (GetVersionEx(&info)) {
      state = 0;
      if (info.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS && info.dwBuildNumber < 1000)
        state = 1;
    }
  }
  return state != 0;
}


BOOL PIPSocket::IsLocalHost(const PString & hostname)
{
  if (hostname.IsEmpty())
    return TRUE;

  if (hostname *= "localhost")
    return TRUE;

  // lookup the host address using inet_addr, assuming it is a "." address
  PIPSocket::Address addr = hostname;
  if (addr.IsLoopback())  // Is 127.0.0.1 or ::1
    return TRUE;

  if (addr == 0) {
    if (!GetHostAddress(hostname, addr))
      return FALSE;
  }

  // Seb: Should check that it's really IPv4 aware.
  struct hostent * host_info = ::gethostbyname(GetHostName());

  if (P_IsOldWin95())
    return addr == *(struct in_addr *)host_info->h_addr_list[0];

  for (PINDEX i = 0; host_info->h_addr_list[i] != NULL; i++) {
#if P_HAS_IPV6
    if (host_info->h_length == 16) {
      if (addr == *(struct in6_addr *)host_info->h_addr_list[i])
        return TRUE;
    }
    else
#endif
    if (addr == *(struct in_addr *)host_info->h_addr_list[i])
      return TRUE;
  }
  return FALSE;
}

//////////////////////////////////////////////////////////////////////////////
// PUDPSocket

BOOL PUDPSocket::disableGQoS = TRUE;

void PUDPSocket::EnableGQoS()
{
  disableGQoS = FALSE;
}

#if P_HAS_QOS
BOOL PUDPSocket::SupportQoS(const PIPSocket::Address & address)
{
  if (disableGQoS)
    return FALSE;

  if (!address.IsValid())
    return FALSE;

  // Check to See if OS supportive
    OSVERSIONINFO versInfo;
    ZeroMemory(&versInfo,sizeof(OSVERSIONINFO));
    versInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
    if (!(GetVersionEx(&versInfo)))
        return FALSE;
    else
    {
        if (versInfo.dwMajorVersion < 5)
            return FALSE;  // Not Supported in Windows

        if (versInfo.dwMajorVersion == 5 &&
            versInfo.dwMinorVersion == 0)
            return FALSE;         //Windows 2000 does not always support QOS_DESTADDR
    }

  // Need to put in a check to see if the NIC has 802.1p packet priority support 
  // This Requires access to the NIC driver and requires Windows DDK. To Be Done Sometime...
  
  // Get the name of the required NIC to check whether it supports 802.1p
  PString NICname =  PIPSocket::GetInterface(address);

  // For Now Assume it can.
  return TRUE;
}

#else

BOOL PUDPSocket::SupportQoS(const PIPSocket::Address &)
{
  return FALSE;
}
#endif  // P_HAS_QOS


#if P_HAS_QOS

#ifndef _WIN32_WCE

PWinQoS::~PWinQoS()
{
    delete sa;
}

PWinQoS::PWinQoS(PQoS & pqos, struct sockaddr * to, char * inBuf, DWORD & bufLen)
{