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/*
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* Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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* System Includes
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*
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*/
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#include <stdio.h>
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#include <assert.h>
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/*************************************************************************************
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*
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* LocalIncludes
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*
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************************************************************************************/
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#include "CSerialTcpRelay.h"
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/*************************************************************************************
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*
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* Definitions
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*
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************************************************************************************/
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#define SOCKET_TIMEOUT (1000)
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/*************************************************************************************
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*
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* PUBLIC METHOD: CSerialTcpRelay
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*
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************************************************************************************/
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CSerialTcpRelay::CSerialTcpRelay() : iSerialThread("SerialThread"), iSocketThread("SocketThread")
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{
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iSerialPort = NULL;
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iSocket = INVALID_SOCKET;
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iState = iSerialState = iSocketState = RS_NEW;
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}
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/*************************************************************************************
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*
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* PUBLIC METHOD: ~CSerialTcpRelay
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*
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************************************************************************************/
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CSerialTcpRelay::~CSerialTcpRelay()
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{
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assert( iSocket == INVALID_SOCKET );
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assert( iState != RS_ACTIVE );
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assert( iSerialState != RS_ACTIVE );
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assert( iSocketState != RS_ACTIVE );
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}
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/*************************************************************************************
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*
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* PUBLIC METHOD: InitialiseRelay
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*
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************************************************************************************/
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TRelayError CSerialTcpRelay::InitialiseRelay( CSerialPort *aSerialPort, SOCKADDR_IN aRemoteAddress, char *aInitialBuffer, int aBufferLength, int *aErrCode )
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{
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int err;
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// check params
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assert( aSerialPort != NULL );
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assert( aErrCode != NULL );
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// save the state vars
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*aErrCode = 0;
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iSerialPort = aSerialPort;
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iRemoteAddress = aRemoteAddress;
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// open the socket
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iSocket = socket( AF_INET, SOCK_STREAM, 0 );
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if( iSocket == INVALID_SOCKET ){
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*aErrCode = WSAGetLastError();
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return RE_SOCKET_FAILED;
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}
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err = connect( iSocket, (struct sockaddr*)&iRemoteAddress, sizeof(iRemoteAddress) );
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if( err == SOCKET_ERROR ) {
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*aErrCode = WSAGetLastError();
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closesocket( iSocket );
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iSocket = INVALID_SOCKET;
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return RE_CONNECT_FAILED;
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}
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// if there is some initial data then send it
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if( (aInitialBuffer != NULL) && (aBufferLength > 0) ) {
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err = send( iSocket, aInitialBuffer, aBufferLength, 0 );
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if( err != aBufferLength ) {
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*aErrCode = WSAGetLastError();
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closesocket( iSocket );
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iSocket = INVALID_SOCKET;
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return RE_INITIAL_SEND_FAILED;
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}
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}
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// update the state
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iState = iSerialState = iSocketState = RS_ACTIVE;
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// ok we are ready to go
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return RE_SUCCESS;
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}
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/*************************************************************************************
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*
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* PUBLIC METHOD: ExecuteRelay
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*
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************************************************************************************/
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TRelayError CSerialTcpRelay::ExecuteRelay()
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{
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TThreadError terr;
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int errcode;
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// create the serial thread
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terr = iSerialThread.StartThread( CSerialTcpRelay::SerialThreadProc, this, &errcode );
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assert( terr == TE_NONE );
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// create the socket thread
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terr = iSocketThread.StartThread( CSerialTcpRelay::SocketThreadProc, this, &errcode );
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assert( terr == TE_NONE );
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// wait for the serial thread to exit
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terr = iSerialThread.WaitForThread( INFINITE );
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assert( terr == TE_NONE );
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// wait for the socket thread to exit
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terr = iSocketThread.WaitForThread( INFINITE );
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assert( terr == TE_NONE );
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// done
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iState = RS_CLOSED;
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return RE_SUCCESS;
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}
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/*************************************************************************************
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*
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* PRIVATE METHOD: ExecuteSerialThread
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*
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************************************************************************************/
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TRelayError CSerialTcpRelay::ExecuteSerialThread()
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{
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int err, bytes_read;
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DWORD dwModemStatus;
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// repeat...
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while( 1 ) {
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// read from the serial port
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bytes_read = SERIALREADBUFFSIZE;
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err = iSerialPort->ReceiveBytes( iSerialReadBuffer, &bytes_read );
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// if there was an error other than timeout then break
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if( err != 0 ) {
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break;
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}
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// write any received data to the socket - break on error
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if( bytes_read > 0 ) {
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// fprintf( stderr, "DEBUG: serial <-> socket (%d)\n", bytes_read );
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err = send( iSocket, iSerialReadBuffer, bytes_read, 0 );
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if( err != bytes_read ) {
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break;
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}
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}
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// check the serial line flags - if the peer has lowered cts or dsr then
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// we take this as meaning that they have closed the port
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err = GetCommModemStatus( iSerialPort->Handle(), &dwModemStatus );
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assert( err != 0 );
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if( ((dwModemStatus & MS_CTS_ON) == 0) ) {
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break;
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}
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// if the socket thread has exited then exit
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if( iSocketState == RS_CLOSED ) {
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break;
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}
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}
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// set my status to closed
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iSerialState = RS_CLOSED;
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return RE_SUCCESS;
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}
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/*************************************************************************************
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*
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* PRIVATE METHOD: ExecuteSerialThread
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*
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************************************************************************************/
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TRelayError CSerialTcpRelay::ExecuteSocketThread()
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{
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int err, bytes_read, bytes_written;
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struct timeval read_timeout;
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fd_set read_fds;
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// repeat...
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while( 1 ) {
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// setup things
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read_timeout.tv_sec = 0;
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read_timeout.tv_usec = (SOCKET_TIMEOUT*1000);
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FD_ZERO( &read_fds );
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FD_SET( iSocket, &read_fds );
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// see if data is available
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err = select( 1, &read_fds, NULL, NULL, &read_timeout );
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// break on errors
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if( err == SOCKET_ERROR ) {
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break;
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}
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// if there is data available then read it - break on error
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if( err != 0 ) {
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bytes_read = recv( iSocket, iSocketReadBuffer, SOCKETREADBUFFSIZE, 0 );
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if( bytes_read <= 0 ) {
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break;
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}
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}
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// write any received data to the serial port - break on error
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if( bytes_read > 0 ) {
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bytes_written = bytes_read;
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// fprintf( stderr, "DEBUG: socket <-> serial (%d)\n", bytes_read );
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err = iSerialPort->SendBytes( iSocketReadBuffer, &bytes_written );
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if( err != 0 ) {
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break;
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}
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}
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// if the serial thread has exited then exit
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if( iSerialState == RS_CLOSED ) {
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break;
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}
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}
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// close the socket
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closesocket( iSocket );
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iSocket = INVALID_SOCKET;
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// set my status to closed
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iSocketState = RS_CLOSED;
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return RE_SUCCESS;
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}
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/*************************************************************************************
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*
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* PRIVATE METHOD: Thread Entry Procs
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*
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************************************************************************************/
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int CSerialTcpRelay::SerialThreadProc( CSerialTcpRelay *aRelay )
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{
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return (int)aRelay->ExecuteSerialThread();
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}
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int CSerialTcpRelay::SocketThreadProc( CSerialTcpRelay *aRelay )
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{
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return (int)aRelay->ExecuteSocketThread();
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}
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