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Annotation of embedaddon/libnet/sample/arp.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  *  $Id: arp.c,v 1.6 2004/03/01 20:26:12 mike 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 */