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//==========================================================================

//

//      tests/tcp_sink.c

//

//      Simple TCP throughput test - sink component

//      * CAUTION: host, i.e. non eCos, only *

//

//==========================================================================

//####BSDCOPYRIGHTBEGIN####

//

// -------------------------------------------

//

// Portions of this software may have been derived from OpenBSD or other sources,

// and are covered by the appropriate copyright disclaimers included herein.

//

// -------------------------------------------

//

//####BSDCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    gthomas

// Contributors: gthomas

// Date:         2000-01-10

// Purpose:      

// Description:  This is the middle part of a three part test.  The idea is

//   to test the throughput of box in a configuration like this:

//

//      +------+   port   +----+     port    +----+

//      |SOURCE|=========>|ECHO|============>|SINK|

//      +------+   9990   +----+     9991    +----+

// 

//

//####DESCRIPTIONEND####

//

//==========================================================================

// Network throughput test code

#undef _KERNEL

#include <stdlib.h>

#include <unistd.h>

#include <stdio.h>

#include <sys/param.h>

#include <sys/socket.h>

#include <sys/ioctl.h>

#include <sys/errno.h>

#include <sys/time.h>

#include <net/if.h>

#include <netinet/in.h>

#include <netinet/ip.h>

#include <netinet/ip_icmp.h>

#include <net/route.h>

#include <netdb.h>

#define SOURCE_PORT 9990

#define SINK_PORT   9991

struct test_params {

    long nbufs;

    long bufsize;

    long load;

};

struct test_status {

    long ok;

};

#define NUM_BUF 128

#define MAX_BUF 32 * 8192

static unsigned char data_buf[MAX_BUF];

void

pexit(char *s)

{

    perror(s);

    exit(1);

}

void

show_results(struct timeval *start, struct timeval *end,

             int nbufs, int buflen)

{

    struct timeval tot_time;

    long tot_bytes = nbufs * buflen;

    double real_time, thru;

    timersub(end, start, &tot_time);

    printf("SINK complete - %d bufs of %d bytes in %ld.%02ld seconds",

           nbufs, buflen,

           tot_time.tv_sec, tot_time.tv_usec / 10000);

    real_time = tot_time.tv_sec + ((tot_time.tv_usec / 10000) * .01);

    // Compute bytes / second (rounded up)

    thru = tot_bytes / real_time;

    // Convert to Mb / second

    printf(" - %.2f KB/S", thru / 1024.0);

    printf(" - %.4f Mbit/S (M = 10^6)", thru * 8.0 / 1000000.0);

    printf("\n");

}

int

do_read(int s, unsigned char *buf, int len)

{

    int total, slen, rlen;

    total = 0;

    rlen = len;

    while (total < len) {

        slen = read(s, buf, rlen);

        if (slen != rlen) {

            if (slen < 0) {

                printf("Error after reading %d bytes\n", total);

                return -1;

            }

            rlen -= slen;

            buf += slen;

        }

        total += slen;

    }

    return total;

}

int

do_write(int s, unsigned char *buf, int len)

{

    int total, slen, rlen;

    total = 0;

    rlen = len;

    while (total < len) {

        slen = write(s, buf, rlen);

        if (slen != rlen) {

            if (slen < 0) {

                printf("Error after writing %d bytes\n", total);

                return -1;

            }

            rlen -= slen;

            buf += slen;

        }

        total += slen;

    }

    return total;

}

static void

sink_test(char *echo_node)

{

    int s_sink;

    struct sockaddr_in slave, local;

    int one = 1;

    int len;

    struct hostent *host;

    struct test_params params, nparams;

    struct test_status status, nstatus;

    struct timeval start_time, end_time;

    int i;

    printf("Start TCP test - SINK mode to %s\n", echo_node);

    host = gethostbyname(echo_node);

    if (host == (struct hostent *)NULL) {

        pexit("gethostbyname");

    }

    memset(&slave, 0, sizeof(slave));

    slave.sin_family = AF_INET;

#ifdef __ECOS

    slave.sin_len = sizeof(slave);

#endif

    slave.sin_port = htons(SINK_PORT);

    memcpy(&slave.sin_addr.s_addr, host->h_addr, host->h_length);

    s_sink = socket(AF_INET, SOCK_STREAM, 0);

    if (s_sink < 0) {

        pexit("stream socket");

    }

    if (setsockopt(s_sink, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one))) {

        pexit("setsockopt /sink/ SO_REUSEADDR");

    }

    memset(&local, 0, sizeof(local));

    local.sin_family = AF_INET;

#ifdef __ECOS

    local.sin_len = sizeof(local);

#endif

    local.sin_port = INADDR_ANY;

    local.sin_addr.s_addr = INADDR_ANY;

    if(bind(s_sink, (struct sockaddr *) &local, sizeof(local)) < 0) {

        pexit("bind /sink/ error");

    }

    if (connect(s_sink, (struct sockaddr *)&slave, sizeof(slave)) < 0) {

        pexit("Can't connect to target");

    }

    // Get testing paramters from middleman

    if (do_read(s_sink, (unsigned char *)&nparams, sizeof(nparams))

                  != sizeof(nparams)) {

        pexit("Can't read initialization parameters");

    }

    params.nbufs = ntohl(nparams.nbufs);

    params.bufsize = ntohl(nparams.bufsize);

    params.load = ntohl(nparams.load);

    printf("Using %ld buffers of %ld bytes each\n", params.nbufs, params.bufsize);

    // Actual test

    gettimeofday(&start_time, 0);

    for (i = 0;  i < params.nbufs;  i++) {

        if ((len = do_read(s_sink, data_buf, params.bufsize)) != params.bufsize) {

            printf("Error reading buffer #%d:", i+1);

            if (len < 0) {

                perror("can't read data");

            } else {

                printf(" short data, only read %d bytes\n", len);

            }

        }

    }

    gettimeofday(&end_time, 0);

    show_results(&start_time, &end_time, params.nbufs, params.bufsize);

    // Tell the middleman

    nstatus.ok = htonl(status.ok);

    if (do_write(s_sink, (unsigned char *)&nstatus, sizeof(nstatus))

                        != sizeof(nstatus)) {

        pexit("Can't send ACK to 'echo' host");

    }

}

int

main(int argc, char *argv[])

{

    sink_test(argv[1]);

    return 0;

}