Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!usc!bloom-beacon!think!husc6!rice!sun-spots-request
From: ronen%math.tau.ac.il@cunyvm.cuny.edu
Newsgroups: comp.sys.sun
Subject: Sending raw ethernet packets
Keywords: Networks
Message-ID: <4198@kalliope.rice.edu>
Date: 29 Jun 89 08:13:24 GMT
Sender: usenet@rice.edu
Organization: Sun-Spots
Lines: 68
Approved: Sun-Spots@rice.edu
X-Sun-Spots-Digest: Volume 8, Issue 56, message 2 of 4

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@math.tau.ac.il
        ronen@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 *)&ifr;
        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);
        }
}