client.cpp

this is just a test file.please pardon me for the ignorance.ignorance is bliss

                                                     / mSettings->mUDPRate) ); 
        if ( delay_target < 0  || 
             delay_target > (int) 1 * kSecs_to_usecs ) {
            fprintf( stderr, warn_delay_large, delay_target / kSecs_to_usecs ); 
            delay_target = (int) kSecs_to_usecs * 1; 
        }
        if ( isFileInput( mSettings ) ) {
            if ( isCompat( mSettings ) ) {
                Extractor_reduceReadSize( sizeof(struct UDP_datagram), mSettings );
                readAt += sizeof(struct UDP_datagram);
            } else {
                Extractor_reduceReadSize( sizeof(struct UDP_datagram) +
                                          sizeof(struct client_hdr), mSettings );
                readAt += sizeof(struct UDP_datagram) +
                          sizeof(struct client_hdr);
            }
        }
    }

    ReportStruct *reportstruct = NULL;

    // InitReport handles Barrier for multiple Streams
    mSettings->reporthdr = InitReport( mSettings );
    reportstruct = new ReportStruct;
    reportstruct->packetID = 0;

    lastPacketTime.setnow();
    
    do {

        // Test case: drop 17 packets and send 2 out-of-order: 
        // sequence 51, 52, 70, 53, 54, 71, 72 
        //switch( datagramID ) { 
        //  case 53: datagramID = 70; break; 
        //  case 71: datagramID = 53; break; 
        //  case 55: datagramID = 71; break; 
        //  default: break; 
        //} 
        gettimeofday( &(reportstruct->packetTime), NULL );

        if ( isUDP( mSettings ) ) {
            // store datagram ID into buffer 
            mBuf_UDP->id      = htonl( (reportstruct->packetID)++ ); 
            mBuf_UDP->tv_sec  = htonl( reportstruct->packetTime.tv_sec ); 
            mBuf_UDP->tv_usec = htonl( reportstruct->packetTime.tv_usec );

            // delay between writes 
            // make an adjustment for how long the last loop iteration took 
            // TODO this doesn't work well in certain cases, like 2 parallel streams 
            adjust = delay_target + lastPacketTime.subUsec( reportstruct->packetTime ); 
            lastPacketTime.set( reportstruct->packetTime.tv_sec, 
                                reportstruct->packetTime.tv_usec ); 

            if ( adjust > 0  ||  delay > 0 ) {
                delay += adjust; 
            }
        }

        // Read the next data block from 
        // the file if it's file input 
        if ( isFileInput( mSettings ) ) {
            Extractor_getNextDataBlock( readAt, mSettings ); 
            canRead = Extractor_canRead( mSettings ) != 0; 
        } else
            canRead = true; 

        // perform write 
        currLen = write( mSettings->mSock, mBuf, mSettings->mBufLen ); 
        if ( currLen < 0 && errno != ENOBUFS ) {
            WARN_errno( currLen < 0, "write2" ); 
            break; 
        }

        // report packets 
        reportstruct->packetLen = currLen;
        ReportPacket( mSettings->reporthdr, reportstruct );
        
        if ( delay > 0 ) {
            delay_loop( delay ); 
        }
        if ( !mMode_Time ) {
            mSettings->mAmount -= currLen;
        }

    } while ( ! (sInterupted  || 
                 (mMode_Time   &&  mEndTime.before( reportstruct->packetTime ))  || 
                 (!mMode_Time  &&  0 >= mSettings->mAmount)) && canRead ); 

    // stop timing
    gettimeofday( &(reportstruct->packetTime), NULL );
    CloseReport( mSettings->reporthdr, reportstruct );

    if ( isUDP( mSettings ) ) {
        // send a final terminating datagram 
        // Don't count in the mTotalLen. The server counts this one, 
        // but didn't count our first datagram, so we're even now. 
        // The negative datagram ID signifies termination to the server. 
    
        // store datagram ID into buffer 
        mBuf_UDP->id      = htonl( -(reportstruct->packetID)  ); 
        mBuf_UDP->tv_sec  = htonl( reportstruct->packetTime.tv_sec ); 
        mBuf_UDP->tv_usec = htonl( reportstruct->packetTime.tv_usec ); 

        if ( isMulticast( mSettings ) ) {
            write( mSettings->mSock, mBuf, mSettings->mBufLen ); 
        } else {
            write_UDP_FIN( ); 
        }
    }
    DELETE_PTR( reportstruct );
    EndReport( mSettings->reporthdr );
} 
// end Run

void Client::InitiateServer() {
    if ( !isCompat( mSettings ) ) {
        int currLen;
        client_hdr* temp_hdr;
        if ( isUDP( mSettings ) ) {
            UDP_datagram *UDPhdr = (UDP_datagram *)mBuf;
            temp_hdr = (client_hdr*)(UDPhdr + 1);
        } else {
            temp_hdr = (client_hdr*)mBuf;
        }
        Settings_GenerateClientHdr( mSettings, temp_hdr );
        if ( !isUDP( mSettings ) ) {
            currLen = send( mSettings->mSock, mBuf, sizeof(client_hdr), 0 );
            if ( currLen < 0 ) {
                WARN_errno( currLen < 0, "write1" );
            }
        }
    }
}

/* -------------------------------------------------------------------
 * Setup a socket connected to a server.
 * If inLocalhost is not null, bind to that address, specifying
 * which outgoing interface to use.
 * ------------------------------------------------------------------- */

void Client::Connect( ) {
    int rc;
    SockAddr_remoteAddr( mSettings );

    assert( mSettings->inHostname != NULL );

    // create an internet socket
    int type = ( isUDP( mSettings )  ?  SOCK_DGRAM : SOCK_STREAM);

    int domain = (SockAddr_isIPv6( &mSettings->peer ) ? 
#ifdef HAVE_IPV6
                  AF_INET6
#else
                  AF_INET
#endif
                  : AF_INET);

    mSettings->mSock = socket( domain, type, 0 );
    WARN_errno( mSettings->mSock == INVALID_SOCKET, "socket" );

    SetSocketOptions( mSettings );


    SockAddr_localAddr( mSettings );
    if ( mSettings->mLocalhost != NULL ) {
        // bind socket to local address
        rc = bind( mSettings->mSock, (sockaddr*) &mSettings->local, 
                   SockAddr_get_sizeof_sockaddr( &mSettings->local ) );
        WARN_errno( rc == SOCKET_ERROR, "bind" );
    }

    // connect socket
    rc = connect( mSettings->mSock, (sockaddr*) &mSettings->peer, 
                  SockAddr_get_sizeof_sockaddr( &mSettings->peer ));
    WARN_errno( rc == SOCKET_ERROR, "connect" );

    getsockname( mSettings->mSock, (sockaddr*) &mSettings->local, 
                 &mSettings->size_local );
    getpeername( mSettings->mSock, (sockaddr*) &mSettings->peer,
                 &mSettings->size_peer );
} // end Connect

/* ------------------------------------------------------------------- 
 * Send a datagram on the socket. The datagram's contents should signify 
 * a FIN to the application. Keep re-transmitting until an 
 * acknowledgement datagram is received. 
 * ------------------------------------------------------------------- */ 

void Client::write_UDP_FIN( ) {
    int rc; 
    fd_set readSet; 
    struct timeval timeout; 

    int count = 0; 
    while ( count < 10 ) {
        count++; 

        // write data 
        write( mSettings->mSock, mBuf, mSettings->mBufLen ); 

        // wait until the socket is readable, or our timeout expires 
        FD_ZERO( &readSet ); 
        FD_SET( mSettings->mSock, &readSet ); 
        timeout.tv_sec  = 0; 
        timeout.tv_usec = 250000; // quarter second, 250 ms 

        rc = select( mSettings->mSock+1, &readSet, NULL, NULL, &timeout ); 
        FAIL_errno( rc == SOCKET_ERROR, "select", mSettings ); 

        if ( rc == 0 ) {
            // select timed out 
            continue; 
        } else {
            // socket ready to read 
            rc = read( mSettings->mSock, mBuf, mSettings->mBufLen ); 
            WARN_errno( rc < 0, "read" );
    	    if ( rc < 0 ) {
                break;
            } else if ( rc >= (int) (sizeof(UDP_datagram) + sizeof(server_hdr)) ) {
                ReportServerUDP( mSettings, (server_hdr*) ((UDP_datagram*)mBuf + 1) );
            }

            return; 
        } 
    } 

    fprintf( stderr, warn_no_ack, mSettings->mSock, count ); 
} 
// end write_UDP_FIN