Quelle Server.cpp Sprache: C

/*---------------------------------------------------------------
* Copyright (c) 1999,2000,2001,2002,2003
* The Board of Trustees of the University of Illinois
* All Rights Reserved.
*---------------------------------------------------------------
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software (Iperf) and associated
* documentation files (the "Software"), to deal in the Software
* without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit
* persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and
* the following disclaimers.
*
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimers in the documentation and/or other materials
* provided with the distribution.
*
*
* Neither the names of the University of Illinois, NCSA,
* nor the names of its contributors may be used to endorse
* or promote products derived from this Software without
* specific prior written permission.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE CONTIBUTORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
* ________________________________________________________________
* National Laboratory for Applied Network Research
* National Center for Supercomputing Applications
* University of Illinois at Urbana-Champaign
* http://www.ncsa.uiuc.edu
* ________________________________________________________________
*
* Server.cpp
* by Mark Gates <mgates@nlanr.net>
*     Ajay Tirumala (tirumala@ncsa.uiuc.edu>.
* -------------------------------------------------------------------
* A server thread is initiated for each connection accept() returns.
* Handles sending and receiving data, and then closes socket.
* Changes to this version : The server can be run as a daemon
* ------------------------------------------------------------------- */

#define HEADERS()

#include "headers.h"
#include "Server.hpp"
#include "List.h"
#include "Extractor.h"
#include "Reporter.h"
#include "Locale.h"

/* -------------------------------------------------------------------
* Stores connected socket and socket info.
* ------------------------------------------------------------------- */

Server::Server( thread_Settings *inSettings ) {
    mSettings = inSettings;
    mBuf = NULL;

    // initialize buffer
    mBuf = new char[ mSettings->mBufLen ];
    FAIL_errno( mBuf == NULL, "No memory for buffer\n", mSettings );
}

/* -------------------------------------------------------------------
* Destructor close socket.
* ------------------------------------------------------------------- */

Server::~Server() {
    if ( mSettings->mSock != INVALID_SOCKET ) {
        int rc = close( mSettings->mSock );
        WARN_errno( rc == SOCKET_ERROR, "close" );
        mSettings->mSock = INVALID_SOCKET;
    }
    DELETE_ARRAY( mBuf );
}

void Server::Sig_Int( int inSigno ) {
}

/* -------------------------------------------------------------------
* Receive data from the (connected) socket.
* Sends termination flag several times at the end.
* Does not close the socket.
* ------------------------------------------------------------------- */
void Server::Run( void ) {
    long currLen;
    max_size_t totLen = 0;
    struct UDP_datagram* mBuf_UDP  = (struct UDP_datagram*) mBuf;

    ReportStruct *reportstruct = NULL;

    reportstruct = new ReportStruct;
    if ( reportstruct != NULL ) {
        reportstruct->packetID = 0;
        mSettings->reporthdr = InitReport( mSettings );
        do {
            // perform read
            currLen = recv( mSettings->mSock, mBuf, mSettings->mBufLen, 0 );

            if ( isUDP( mSettings ) ) {
                // read the datagram ID and sentTime out of the buffer
                reportstruct->packetID = ntohl( mBuf_UDP->id );
                reportstruct->sentTime.tv_sec = ntohl( mBuf_UDP->tv_sec  );
                reportstruct->sentTime.tv_usec = ntohl( mBuf_UDP->tv_usec );
  reportstruct->packetLen = currLen;
  gettimeofday( &(reportstruct->packetTime), NULL );
            } else {
  totLen += currLen;
     }

            // terminate when datagram begins with negative index
            // the datagram ID should be correct, just negated
            if ( reportstruct->packetID < 0 ) {
                reportstruct->packetID = -reportstruct->packetID;
                currLen = -1;
            }

     if ( isUDP (mSettings)) {
  ReportPacket( mSettings->reporthdr, reportstruct );
            } else if ( !isUDP (mSettings) && mSettings->mInterval > 0) {
                reportstruct->packetLen = currLen;
                gettimeofday( &(reportstruct->packetTime), NULL );
                ReportPacket( mSettings->reporthdr, reportstruct );
            }

        } while ( currLen > 0 );


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

if ( !isUDP (mSettings)) {
  if(0.0 == mSettings->mInterval) {
                        reportstruct->packetLen = totLen;
                }
  ReportPacket( mSettings->reporthdr, reportstruct );
}
        CloseReport( mSettings->reporthdr, reportstruct );

        // send a acknowledgement back only if we're NOT receiving multicast
        if ( isUDP( mSettings ) && !isMulticast( mSettings ) ) {
            // send back an acknowledgement of the terminating datagram
            write_UDP_AckFIN( );
        }
    } else {
        FAIL(1, "Out of memory! Closing server thread\n", mSettings);
    }

    Mutex_Lock( &clients_mutex );
    Iperf_delete( &(mSettings->peer), &clients );
    Mutex_Unlock( &clients_mutex );

    DELETE_PTR( reportstruct );
    EndReport( mSettings->reporthdr );
}
// end Recv

/* -------------------------------------------------------------------
* Send an AckFIN (a datagram acknowledging a FIN) on the socket,
* then select on the socket for some time. If additional datagrams
* come in, probably our AckFIN was lost and they are re-transmitted
* termination datagrams, so re-transmit our AckFIN.
* ------------------------------------------------------------------- */

void Server::write_UDP_AckFIN( ) {

    int rc;

    fd_set readSet;
    FD_ZERO( &readSet );

    struct timeval timeout;

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

        UDP_datagram *UDP_Hdr;
        server_hdr *hdr;

        UDP_Hdr = (UDP_datagram*) mBuf;

        if ( mSettings->mBufLen > (int) ( sizeof( UDP_datagram )
                                          + sizeof( server_hdr ) ) ) {
            Transfer_Info *stats = GetReport( mSettings->reporthdr );
            hdr = (server_hdr*) (UDP_Hdr+1);

            hdr->flags        = htonl( HEADER_VERSION1 );
            hdr->total_len1   = htonl( (long) (stats->TotalLen >> 32) );
            hdr->total_len2   = htonl( (long) (stats->TotalLen & 0xFFFFFFFF) );
            hdr->stop_sec     = htonl( (long) stats->endTime );
            hdr->stop_usec    = htonl( (long)((stats->endTime - (long)stats->endTime)
                                              * rMillion));
            hdr->error_cnt    = htonl( stats->cntError );
            hdr->outorder_cnt = htonl( stats->cntOutofOrder );
            hdr->datagrams    = htonl( stats->cntDatagrams );
            hdr->jitter1      = htonl( (long) stats->jitter );
            hdr->jitter2      = htonl( (long) ((stats->jitter - (long)stats->jitter)
                                               * rMillion) );

        }

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

        // wait until the socket is readable, or our timeout expires
        FD_SET( mSettings->mSock, &readSet );
        timeout.tv_sec  = 1;
        timeout.tv_usec = 0;

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

        if ( rc == 0 ) {
            // select timed out
            return;
        } else {
            // socket ready to read
            rc = read( mSettings->mSock, mBuf, mSettings->mBufLen );
            WARN_errno( rc < 0, "read" );
            if ( rc <= 0 ) {
                // Connection closed or errored
                // Stop using it.
                return;
            }
        }
    }

    fprintf( stderr, warn_ack_failed, mSettings->mSock, count );
}
// end write_UDP_AckFIN

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