iperf-2.0.5/src/PerfSocket.cpp

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 * National Laboratory for Applied Network Research 
 * National Center for Supercomputing Applications 
 * University of Illinois at Urbana-Champaign 
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 *
 * PerfSocket.cpp
 * by Mark Gates <mgates@nlanr.net>
 *    Ajay Tirumala <tirumala@ncsa.uiuc.edu>
 * -------------------------------------------------------------------
 * Has routines the Client and Server classes use in common for
 * performance testing the network.
 * Changes in version 1.2.0
 *     for extracting data from files
 * -------------------------------------------------------------------
 * headers
 * uses
 *   <stdlib.h>
 *   <stdio.h>
 *   <string.h>
 *
 *   <sys/types.h>
 *   <sys/socket.h>
 *   <unistd.h>
 *
 *   <arpa/inet.h>
 *   <netdb.h>
 *   <netinet/in.h>
 *   <sys/socket.h>
 * ------------------------------------------------------------------- */


#define HEADERS()

#include "headers.h"

#include "PerfSocket.hpp"
#include "SocketAddr.h"
#include "util.h"

/* -------------------------------------------------------------------
 * Set socket options before the listen() or connect() calls.
 * These are optional performance tuning factors.
 * ------------------------------------------------------------------- */

void SetSocketOptions( thread_Settings *inSettings ) {
    // set the TCP window size (socket buffer sizes)
    // also the UDP buffer size
    // must occur before call to accept() for large window sizes
    setsock_tcp_windowsize( inSettings->mSock, inSettings->mTCPWin,
                            (inSettings->mThreadMode == kMode_Client ? 1 : 0) );

    if ( isCongestionControl( inSettings ) ) {
#ifdef TCP_CONGESTION
	Socklen_t len = strlen( inSettings->mCongestion ) + 1;
	int rc = setsockopt( inSettings->mSock, IPPROTO_TCP, TCP_CONGESTION,
			     inSettings->mCongestion, len);
	if (rc == SOCKET_ERROR ) {
		fprintf(stderr, "Attempt to set '%s' congestion control failed: %s\n",
			inSettings->mCongestion, strerror(errno));
		exit(1);
	}
#else
	fprintf( stderr, "The -Z option is not available on this operating system\n");
#endif
    }

    // check if we're sending multicast, and set TTL
    if ( isMulticast( inSettings ) && ( inSettings->mTTL > 0 ) ) {
	int val = inSettings->mTTL;
#ifdef HAVE_MULTICAST
	if ( !SockAddr_isIPv6( &inSettings->local ) ) {
	    int rc = setsockopt( inSettings->mSock, IPPROTO_IP, IP_MULTICAST_TTL,
		    (const void*) &val, (Socklen_t) sizeof(val));

	    WARN_errno( rc == SOCKET_ERROR, "multicast ttl" );
	}
#ifdef HAVE_IPV6_MULTICAST
	else {
	    int rc = setsockopt( inSettings->mSock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
		    (const void*) &val, (Socklen_t) sizeof(val));
	    WARN_errno( rc == SOCKET_ERROR, "multicast ttl" );
	}
#endif
#endif
    }


#ifdef IP_TOS

    // set IP TOS (type-of-service) field
    if ( inSettings->mTOS > 0 ) {
        int  tos = inSettings->mTOS;
        Socklen_t len = sizeof(tos);
        int rc = setsockopt( inSettings->mSock, IPPROTO_IP, IP_TOS,
                             (char*) &tos, len );
        WARN_errno( rc == SOCKET_ERROR, "setsockopt IP_TOS" );
    }
#endif

    if ( !isUDP( inSettings ) ) {
        // set the TCP maximum segment size
        setsock_tcp_mss( inSettings->mSock, inSettings->mMSS );

#ifdef TCP_NODELAY

        // set TCP nodelay option
        if ( isNoDelay( inSettings ) ) {
            int nodelay = 1;
            Socklen_t len = sizeof(nodelay);
            int rc = setsockopt( inSettings->mSock, IPPROTO_TCP, TCP_NODELAY,
                                 (char*) &nodelay, len );
            WARN_errno( rc == SOCKET_ERROR, "setsockopt TCP_NODELAY" );
        }
#endif
    }
}
// end SetSocketOptions