Sending raw ethernet packets

[ronen%math.tau.ac.il at cunyvm.cuny.edu]

The following program was supposed to send a hand-made packet over the
ethernet.  It completes with no errors, but does not seem to really send
anything.  Am I misunderstanding something ?

I'm using Sun 3/160, SunOS 4.0.1.

        Thank you for any help.

        Ronen Friedman
        ronen at math.tau.ac.il
        ronen at taurus.bitnet


----------------------------------------------------
#include <sys/types.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/stropts.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/nit_pf.h>
#include <net/nit_if.h>
#include <net/nit_buf.h>
#include <stdio.h>

extern int errno;

char mess[] =
/*    to:                |    from:               */
"\011\000\053\000\000\017\252\000\004\000\376\005...............";
                                /* 191 more bytes of data ^^^^  */
main()
{
        struct strioctl     si;
        struct ifreq   ifr;
        struct strbuf datam;
        long if_fd;

        if ((if_fd = open("/dev/nit",O_WRONLY)) < 0) {
                perror("open: ");
                exit(1);
        }

        /*
         * configure the nit device, binding it
         */
        strncpy(ifr.ifr_name, "ie0", sizeof ifr.ifr_name);
        ifr.ifr_name[sizeof ifr.ifr_name - 1] = ' ';
        si.ic_cmd = NIOCBIND;
        si.ic_len = sizeof ifr;
        si.ic_dp = (char *)𝔦
        if (ioctl(if_fd, I_STR, (char *)&si) < 0) {
                perror("bind: ");
                exit(1);
        }

        /*
         * sending the packet on the wire
         */
        datam.maxlen = 203;
        datam.len = 203;
        datam.buf = mess;
        if (putmsg(if_fd, NULL, &datam, 0) != 0) {
                perror("putmsg :");
                exit(1);
        }
}