socket.cxx

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/*
 * socket.cxx
 *
 * Berkley sockets classes implementation
 *
 * Portable Windows Library
 *
 * Copyright (c) 1993-1998 Equivalence Pty. Ltd.
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is Portable Windows Library.
 *
 * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
 *
 * Portions are Copyright (C) 1993 Free Software Foundation, Inc.
 * All Rights Reserved.
 *
 * Contributor(s): ______________________________________.
 *
 * $Revision: 19008 $
 * $Author: rjongbloed $
 * $Date: 2007-11-29 09:17:41 +0000 (Thu, 29 Nov 2007) $
 */

#ifdef __GNUC__
#pragma implementation "sockets.h"
#pragma implementation "socket.h"
#pragma implementation "ipsock.h"
#pragma implementation "udpsock.h"
#pragma implementation "tcpsock.h"
#pragma implementation "ipdsock.h"
#pragma implementation "ethsock.h"
#endif

#include <ptlib.h>
#include <ptlib/sockets.h>


// Appears to have disappeared (I hope - statics impossible in Nucleus!)
//extern PSemaphore PX_iostreamMutex;

PSocket::~PSocket()
{
  os_close();
}

int PSocket::os_close()
{
  if (os_handle < 0)
    return -1;

  // send a shutdown to the other end
  ::shutdown(os_handle, 2);

#ifdef __BEOS__
#ifndef BE_THREADS
  // abort any I/O block using this os_handle
  PProcess::Current().PXAbortIOBlock(os_handle);
#endif

  int retval = ::closesocket(os_handle);
  os_handle = -1;
  return retval;
#else
  return PXClose();
#endif
}

int PSocket::os_socket(int af, int type, int protocol)
{
  // attempt to create a socket
  int handle;
  if ((handle = ::socket(af, type, protocol)) >= 0) {

    // make the socket non-blocking and close on exec
#ifndef __BEOS__
#ifndef P_PTHREADS
    DWORD cmd = 1;
#endif
#else
    int cmd = -1;
#endif

    if (
#ifndef __BEOS__
#ifndef P_PTHREADS
        !ConvertOSError(::ioctl(handle, FIONBIO, &cmd)) ||
#endif
        !ConvertOSError(::fcntl(handle, F_SETFD, 1))) {
      ::shutdown(handle, 2);
#else
	!ConvertOSError(::setsockopt(handle, SOL_SOCKET, SO_NONBLOCK, &cmd, sizeof(int)))) {
      ::closesocket(handle);
#endif
      return -1;
    }
//PError << "socket " << handle << " created" << endl;
  }
  return handle;
}

PBoolean PSocket::os_connect(struct sockaddr * addr, PINDEX size)
{
  int val = ::connect(os_handle, addr, size);
  if (val == 0 || errno != EINPROGRESS)
    return ConvertOSError(val);

  if (!PXSetIOBlock(PXConnectBlock, readTimeout))
    return PFalse;

  // A successful select() call does not necessarily mean the socket connected OK.
  int optval = -1;
  socklen_t optlen = sizeof(optval);
  getsockopt(os_handle, SOL_SOCKET, SO_ERROR, (char *)&optval, &optlen);
  if (optval != 0) {
    errno = optval;
    return ConvertOSError(-1);
  }

  return PTrue;
}


PBoolean PSocket::os_accept(int sock, struct sockaddr * addr, PINDEX * size,
                       const PTimeInterval & timeout)
{
  if (!listener.PXSetIOBlock(PXAcceptBlock, listener.GetReadTimeout()))
    return SetErrorValues(listener.GetErrorCode(), listener.GetErrorNumber());

  return ConvertOSError(SetNonBlocking(::accept(listener.GetHandle(), addr, (socklen_t *)size)));
}


#ifdef __NUCLEUS_PLUS__
#define P_PTHREADS
#endif
#ifndef P_PTHREADS

int PSocket::os_select(int maxHandle,
                   fd_set & readBits,
                   fd_set & writeBits,
                   fd_set & exceptionBits,
          const PIntArray & osHandles,
      const PTimeInterval & timeout)
{
  struct timeval * tptr = NULL;

  int stat = PThread::Current()->PXBlockOnIO(maxHandle,
                                         readBits,
                                         writeBits,
                                         exceptionBits,
                                         timeout,
					 osHandles);
  if (stat <= 0)
    return stat;

  struct timeval tout = {0, 0};
  tptr = &tout;

  return ::select(maxHandle, &readBits, &writeBits, &exceptionBits, tptr);
}
                     
#else

int PSocket::os_select(int maxHandle,
                   fd_set & readBits,
                   fd_set & writeBits,
                   fd_set & exceptionBits,
          const PIntArray & ,
      const PTimeInterval & timeout)
{
  struct timeval * tptr = NULL;
  struct timeval   timeout_val;
  if (timeout != PMaxTimeInterval) {
    if (timeout.GetMilliSeconds() < 1000L*60L*60L*24L) {
      timeout_val.tv_usec = (timeout.GetMilliSeconds() % 1000) * 1000;
      timeout_val.tv_sec  = timeout.GetSeconds();
      tptr                = &timeout_val;
    }
  }

  do {
    int result = ::select(maxHandle, &readBits, &writeBits, &exceptionBits, tptr);
    if (result >= 0)
      return result;
  } while (errno == EINTR);
  return -1;
}

#endif
#ifdef __NUCLEUS_PLUS__
#undef P_PTHREADS
#endif


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


PIPSocket::Address & PIPSocket::Address::operator=(DWORD dw)
{
  s_addr = dw;
  return *this;
}


PIPSocket::Address::operator DWORD() const
{
  return (DWORD)s_addr;
}

BYTE PIPSocket::Address::Byte1() const
{
  return *(((BYTE *)&s_addr)+0);
}

BYTE PIPSocket::Address::Byte2() const
{
  return *(((BYTE *)&s_addr)+1);
}

BYTE PIPSocket::Address::Byte3() const
{
  return *(((BYTE *)&s_addr)+2);
}

BYTE PIPSocket::Address::Byte4() const
{
  return *(((BYTE *)&s_addr)+3);
}

PIPSocket::Address::Address(BYTE b1, BYTE b2, BYTE b3, BYTE b4)
{
  BYTE * p = (BYTE *)&s_addr;
  p[0] = b1;
  p[1] = b2;
  p[2] = b3;
  p[3] = b4;
}

PBoolean PIPSocket::IsLocalHost(const PString & hostname)
{
  if (hostname.IsEmpty())
    return PTrue;

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

  // lookup the host address using inet_addr, assuming it is a "." address
  Address addr = hostname;
  if (addr == 16777343)  // Is 127.0.0.1
    return PTrue;
  if (addr == (DWORD)-1)
    return PFalse;

  if (!GetHostAddress(hostname, addr))
    return PFalse;

  PUDPSocket sock;

#ifndef __BEOS__
  // get number of interfaces
  int ifNum;
#ifdef SIOCGIFNUM
  PAssert(::ioctl(sock.GetHandle(), SIOCGIFNUM, &ifNum) >= 0, "could not do ioctl for ifNum");
#else
  ifNum = 100;
#endif

  PBYTEArray buffer;
  struct ifconf ifConf;
  ifConf.ifc_len  = ifNum * sizeof(ifreq);
  ifConf.ifc_req = (struct ifreq *)buffer.GetPointer(ifConf.ifc_len);
  
  if (ioctl(sock.GetHandle(), SIOCGIFCONF, &ifConf) >= 0) {
#ifndef SIOCGIFNUM
    ifNum = ifConf.ifc_len / sizeof(ifreq);
#endif

    int num = 0;
    for (num = 0; num < ifNum; num++) {

      ifreq * ifName = ifConf.ifc_req + num;
      struct ifreq ifReq;
      strcpy(ifReq.ifr_name, ifName->ifr_name);

      if (ioctl(sock.GetHandle(), SIOCGIFFLAGS, &ifReq) >= 0) {
        int flags = ifReq.ifr_flags;
        if (ioctl(sock.GetHandle(), SIOCGIFADDR, &ifReq) >= 0) {
          if ((flags & IFF_UP) && (addr == Address(((sockaddr_in *)&ifReq.ifr_addr)->sin_addr)))
            return PTrue;
        }
      }
    }
  }
#endif //!__BEOS__

  return PFalse;
}


////////////////////////////////////////////////////////////////
//
//  PTCPSocket
//
PBoolean PTCPSocket::Read(void * buf, PINDEX maxLen)

{
  lastReadCount = 0;

  // wait until select indicates there is data to read, or until
  // a timeout occurs
  if (!PXSetIOBlock(PXReadBlock, readTimeout)) {
    lastError     = Timeout;
    return PFalse;
  }

#ifndef __BEOS__
  // attempt to read out of band data
  char buffer[32];
  int ooblen;
  while ((ooblen = ::recv(os_handle, buffer, sizeof(buffer), MSG_OOB)) > 0) 
    OnOutOfBand(buffer, ooblen);
#endif // !__BEOS__

    // attempt to read non-out of band data
  if (ConvertOSError(lastReadCount = ::recv(os_handle, (char *)buf, maxLen, 0)))
    return lastReadCount > 0;

  lastReadCount = 0;
  return PFalse;
}


int PSocket::os_recvfrom(
      void * buf,     // Data to be written as URGENT TCP data.
      PINDEX len,     // Number of bytes pointed to by <CODE>buf</CODE>.
      int    flags,
      sockaddr * addr, // Address from which the datagram was received.
      PINDEX * addrlen)
{
  if (!PXSetIOBlock(PXReadBlock, readTimeout)) {
    lastError     = Timeout;
    lastReadCount = 0;
    return 0;
  }

  // attempt to read non-out of band data
  if (ConvertOSError(lastReadCount =
        ::recvfrom(os_handle, (char *)buf, len, flags, (sockaddr *)addr, (socklen_t *)addrlen)))
    return lastReadCount > 0;

  lastReadCount = 0;
  return -1;
}


int PSocket::os_sendto(
      const void * buf,   // Data to be written as URGENT TCP data.
      PINDEX len,         // Number of bytes pointed to by <CODE>buf</CODE>.
      int flags,
      sockaddr * addr, // Address to which the datagram is sent.
      PINDEX addrlen)  
{
  lastWriteCount = 0;

  if (!IsOpen()) {
    lastError     = NotOpen;
    return 0;
  }

  // attempt to write data
  int writeResult;
  if (addr != NULL)
    writeResult = ::sendto(os_handle, (char *)buf, len, flags, (sockaddr *)addr, addrlen);
  else
    writeResult = ::send(os_handle, (char *)buf, len, flags);
  if (writeResult > 0) {
//    PThread::Yield();
    lastWriteCount = writeResult;
    return -1;
  }

  if (errno != EWOULDBLOCK)
    return ConvertOSError(-1);

  if (!PXSetIOBlock(PXWriteBlock, writeTimeout)) {
    lastError     = Timeout;
    return 0;
  }

  // attempt to write data
  if (addr != NULL)
    lastWriteCount = ::sendto(os_handle, (char *)buf, len, flags, (sockaddr *)addr, addrlen);
  else
    lastWriteCount = ::send(os_handle, (char *)buf, len, flags);
  if (ConvertOSError(lastWriteCount))
    return lastWriteCount > 0;

  return -1;
}