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Version 1.2p1

    1: /*
    2:  *  $Id: arp.c,v 1.1.1.3 2023/09/27 11:11:38 misho Exp $
    3:  *
    4:  *  libnet 1.1
    5:  *  Build an ARP packet
    6:  *
    7:  *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
    8:  *  All rights reserved.
    9:  *
   10:  * Redistribution and use in source and binary forms, with or without
   11:  * modification, are permitted provided that the following conditions
   12:  * are met:
   13:  * 1. Redistributions of source code must retain the above copyright
   14:  *    notice, this list of conditions and the following disclaimer.
   15:  * 2. Redistributions in binary form must reproduce the above copyright
   16:  *    notice, this list of conditions and the following disclaimer in the
   17:  *    documentation and/or other materials provided with the distribution.
   18:  *
   19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29:  * SUCH DAMAGE.
   30:  *
   31:  */
   32: 
   33: #if (HAVE_CONFIG_H)
   34: #include "../include/config.h"
   35: #endif
   36: #include "./libnet_test.h"
   37: 
   38: int
   39: main(int argc, char *argv[])
   40: {
   41:     int c;
   42:     uint32_t i;
   43:     libnet_t *l;
   44:     libnet_ptag_t t;
   45:     char *device = NULL;
   46:     uint8_t *packet;
   47:     uint32_t packet_s;
   48:     char errbuf[LIBNET_ERRBUF_SIZE];
   49: 
   50:     printf("libnet 1.1 packet shaping: ARP[link -- autobuilding ethernet]\n"); 
   51: 
   52:     if (argc > 1)
   53:     {
   54:          device = argv[1];
   55:     }
   56: 
   57:     l = libnet_init(
   58:             LIBNET_LINK_ADV,                        /* injection type */
   59:             device,                                 /* network interface */
   60:             errbuf);                                /* errbuf */
   61: 
   62:     if (l == NULL)
   63:     {
   64:         fprintf(stderr, "%s", errbuf);
   65:         exit(EXIT_FAILURE);
   66:     }
   67: 	else
   68: 
   69:     i = libnet_get_ipaddr4(l);
   70:   
   71:     t = libnet_build_arp(
   72:             ARPHRD_ETHER,                           /* hardware addr */
   73:             ETHERTYPE_IP,                           /* protocol addr */
   74:             6,                                      /* hardware addr size */
   75:             4,                                      /* protocol addr size */
   76:             ARPOP_REPLY,                            /* operation type */
   77:             enet_src,                               /* sender hardware addr */
   78:             (uint8_t *)&i,                         /* sender protocol addr */
   79:             enet_dst,                               /* target hardware addr */
   80:             (uint8_t *)&i,                         /* target protocol addr */
   81:             NULL,                                   /* payload */
   82:             0,                                      /* payload size */
   83:             l,                                      /* libnet context */
   84:             0);                                     /* libnet id */
   85:     if (t == -1)
   86:     {
   87:         fprintf(stderr, "Can't build ARP header: %s\n", libnet_geterror(l));
   88:         goto bad;
   89:     }
   90: 
   91:     t = libnet_autobuild_ethernet(
   92:             enet_dst,                               /* ethernet destination */
   93:             ETHERTYPE_ARP,                          /* protocol type */
   94:             l);                                     /* libnet handle */
   95:     if (t == -1)
   96:     {
   97:         fprintf(stderr, "Can't build ethernet header: %s\n",
   98:                 libnet_geterror(l));
   99:         goto bad;
  100:     }
  101: 
  102: 
  103:     if (libnet_adv_cull_packet(l, &packet, &packet_s) == -1)
  104:     {
  105:         fprintf(stderr, "%s", libnet_geterror(l));
  106:     }
  107:     else
  108:     {
  109:         fprintf(stderr, "packet size: %d\n", packet_s);
  110:         libnet_adv_free_packet(l, packet);
  111:     }
  112: 
  113:     c = libnet_write(l);
  114: 
  115:     if (c == -1)
  116:     {
  117:         fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
  118:         goto bad;
  119:     }
  120:     else
  121:     {
  122:         fprintf(stderr, "Wrote %d byte ARP packet from context \"%s\"; "
  123:                 "check the wire.\n", c, libnet_cq_getlabel(l));
  124:     }
  125:     libnet_destroy(l);
  126:     return (EXIT_SUCCESS);
  127: bad:
  128:     libnet_destroy(l);
  129:     return (EXIT_FAILURE);
  130: }
  131: