Return to arp.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / libnet / sample

libnet

    1: /*
    2:  *  $Id: arp.c,v 1.1.1.1 2012/02/21 22:14:23 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: #if ((_WIN32) && !(__CYGWIN__)) 
   35: #include "../include/win32/config.h"
   36: #else
   37: #include "../include/config.h"
   38: #endif
   39: #endif
   40: #include "./libnet_test.h"
   41: 
   42: int
   43: main(int argc, char *argv[])
   44: {
   45:     int c;
   46:     u_int32_t i;
   47:     libnet_t *l;
   48:     libnet_ptag_t t;
   49:     char *device = NULL;
   50:     u_int8_t *packet;
   51:     u_int32_t packet_s;
   52:     char errbuf[LIBNET_ERRBUF_SIZE];
   53: 
   54:     printf("libnet 1.1 packet shaping: ARP[link -- autobuilding ethernet]\n"); 
   55: 
   56:     if (argc > 1)
   57:     {
   58:          device = argv[1];
   59:     }
   60: 
   61:     l = libnet_init(
   62:             LIBNET_LINK_ADV,                        /* injection type */
   63:             device,                                 /* network interface */
   64:             errbuf);                                /* errbuf */
   65: 
   66:     if (l == NULL)
   67:     {
   68:         fprintf(stderr, "%s", errbuf);
   69:         exit(EXIT_FAILURE);
   70:     }
   71: 	else
   72: 
   73:     /*
   74:      *  Build the packet, remmebering that order IS important.  We must
   75:      *  build the packet from lowest protocol type on up as it would
   76:      *  appear on the wire.  So for our ARP packet:
   77:      *
   78:      *  -------------------------------------------
   79:      *  |  Ethernet   |           ARP             |
   80:      *  -------------------------------------------
   81:      *         ^                     ^
   82:      *         |------------------   |
   83:      *  libnet_build_ethernet()--|   |
   84:      *                               |
   85:      *  libnet_build_arp()-----------|
   86:      */
   87: 	 
   88:     i = libnet_get_ipaddr4(l);
   89:   
   90:     t = libnet_build_arp(
   91:             ARPHRD_ETHER,                           /* hardware addr */
   92:             ETHERTYPE_IP,                           /* protocol addr */
   93:             6,                                      /* hardware addr size */
   94:             4,                                      /* protocol addr size */
   95:             ARPOP_REPLY,                            /* operation type */
   96:             enet_src,                               /* sender hardware addr */
   97:             (u_int8_t *)&i,                         /* sender protocol addr */
   98:             enet_dst,                               /* target hardware addr */
   99:             (u_int8_t *)&i,                         /* target protocol addr */
  100:             NULL,                                   /* payload */
  101:             0,                                      /* payload size */
  102:             l,                                      /* libnet context */
  103:             0);                                     /* libnet id */
  104:     if (t == -1)
  105:     {
  106:         fprintf(stderr, "Can't build ARP header: %s\n", libnet_geterror(l));
  107:         goto bad;
  108:     }
  109: 
  110:     t = libnet_autobuild_ethernet(
  111:             enet_dst,                               /* ethernet destination */
  112:             ETHERTYPE_ARP,                          /* protocol type */
  113:             l);                                     /* libnet handle */
  114:     if (t == -1)
  115:     {
  116:         fprintf(stderr, "Can't build ethernet header: %s\n",
  117:                 libnet_geterror(l));
  118:         goto bad;
  119:     }
  120: 
  121: 
  122:     if (libnet_adv_cull_packet(l, &packet, &packet_s) == -1)
  123:     {
  124:         fprintf(stderr, "%s", libnet_geterror(l));
  125:     }
  126:     else
  127:     {
  128:         fprintf(stderr, "packet size: %d\n", packet_s);
  129:         libnet_adv_free_packet(l, packet);
  130:     }
  131: 
  132:     c = libnet_write(l);
  133: 
  134:     if (c == -1)
  135:     {
  136:         fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
  137:         goto bad;
  138:     }
  139:     else
  140:     {
  141:         fprintf(stderr, "Wrote %d byte ARP packet from context \"%s\"; "
  142:                 "check the wire.\n", c, libnet_cq_getlabel(l));
  143:     }
  144:     libnet_destroy(l);
  145:     return (EXIT_SUCCESS);
  146: bad:
  147:     libnet_destroy(l);
  148:     return (EXIT_FAILURE);
  149: }
  150: 
  151: /* EOF */