text: /*
   *  $Id: arp.c,v 1.5 2004/01/28 19:45:00 mike Exp $
   *
   *  libnet 1.1
   *  Build an ARP packet
   *
   *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
   *  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   */
  
  #if (HAVE_CONFIG_H)
  #include "../include/config.h"
  #endif
  #include "./libnet_test.h"
  
  int
  main(int argc, char *argv[])
  {
      int c;
      uint32_t i;
      libnet_t *l;
      libnet_ptag_t t;
      char *device = NULL;
      uint8_t *packet;
      uint32_t packet_s;
      char errbuf[LIBNET_ERRBUF_SIZE];
  
      printf("libnet 1.1 packet shaping: ARP[link -- autobuilding ethernet]\n"); 
  
      if (argc > 1)
      {
           device = argv[1];
      }
  
      l = libnet_init(
              LIBNET_LINK_ADV,                        /* injection type */
              device,                                 /* network interface */
              errbuf);                                /* errbuf */
  
      if (l == NULL)
      {
          fprintf(stderr, "%s", errbuf);
          exit(EXIT_FAILURE);
      }
  	else
  
      /*
       *  Build the packet, remmebering that order IS important.  We must
       *  build the packet from lowest protocol type on up as it would
       *  appear on the wire.  So for our ARP packet:
       *
       *  -------------------------------------------
       *  |  Ethernet   |           ARP             |
       *  -------------------------------------------
       *         ^                     ^
       *         |------------------   |
       *  libnet_build_ethernet()--|   |
       *                               |
       *  libnet_build_arp()-----------|
       */
  	 
      i = libnet_get_ipaddr4(l);
    
      t = libnet_autobuild_arp(
              ARPOP_REPLY,                            /* operation type */
              enet_src,                               /* sender hardware addr */
              (uint8_t *)&i,                         /* sender protocol addr */
              enet_dst,                               /* target hardware addr */
              (uint8_t *)&i,                         /* target protocol addr */
              l);                                     /* libnet context */
      if (t == -1)
      {
          fprintf(stderr, "Can't build ARP header: %s\n", libnet_geterror(l));
          goto bad;
      }
  
      t = libnet_autobuild_ethernet(
              enet_dst,                               /* ethernet destination */
              ETHERTYPE_ARP,                          /* protocol type */
              l);                                     /* libnet handle */
      if (t == -1)
      {
          fprintf(stderr, "Can't build ethernet header: %s\n",
                  libnet_geterror(l));
          goto bad;
      }
  
  
      if (libnet_adv_cull_packet(l, &packet, &packet_s) == -1)
      {
          fprintf(stderr, "%s", libnet_geterror(l));
      }
      else
      {
          fprintf(stderr, "packet size: %d\n", packet_s);
          libnet_adv_free_packet(l, packet);
      }
  
      c = libnet_write(l);
  
      if (c == -1)
      {
          fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
          goto bad;
      }
      else
      {
          fprintf(stderr, "Wrote %d byte ARP packet from context \"%s\"; "
                  "check the wire.\n", c, libnet_cq_getlabel(l));
      }
      libnet_destroy(l);
      return (EXIT_SUCCESS);
  bad:
      libnet_destroy(l);
      return (EXIT_FAILURE);
  }
  
  