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Annotation of embedaddon/libnet/sample/arp-new.c, revision 1.1.1.2

1.1       misho       1: /*
                      2:  *  $Id: arp.c,v 1.5 2004/01/28 19:45:00 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: #include "../include/config.h"
                     35: #endif
                     36: #include "./libnet_test.h"
                     37: 
                     38: int
                     39: main(int argc, char *argv[])
                     40: {
                     41:     int c;
1.1.1.2 ! misho      42:     uint32_t i;
1.1       misho      43:     libnet_t *l;
                     44:     libnet_ptag_t t;
                     45:     char *device = NULL;
1.1.1.2 ! misho      46:     uint8_t *packet;
        !            47:     uint32_t packet_s;
1.1       misho      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:     /*
                     70:      *  Build the packet, remmebering that order IS important.  We must
                     71:      *  build the packet from lowest protocol type on up as it would
                     72:      *  appear on the wire.  So for our ARP packet:
                     73:      *
                     74:      *  -------------------------------------------
                     75:      *  |  Ethernet   |           ARP             |
                     76:      *  -------------------------------------------
                     77:      *         ^                     ^
                     78:      *         |------------------   |
                     79:      *  libnet_build_ethernet()--|   |
                     80:      *                               |
                     81:      *  libnet_build_arp()-----------|
                     82:      */
                     83:         
                     84:     i = libnet_get_ipaddr4(l);
                     85:   
                     86:     t = libnet_autobuild_arp(
                     87:             ARPOP_REPLY,                            /* operation type */
                     88:             enet_src,                               /* sender hardware addr */
1.1.1.2 ! misho      89:             (uint8_t *)&i,                         /* sender protocol addr */
1.1       misho      90:             enet_dst,                               /* target hardware addr */
1.1.1.2 ! misho      91:             (uint8_t *)&i,                         /* target protocol addr */
1.1       misho      92:             l);                                     /* libnet context */
                     93:     if (t == -1)
                     94:     {
                     95:         fprintf(stderr, "Can't build ARP header: %s\n", libnet_geterror(l));
                     96:         goto bad;
                     97:     }
                     98: 
                     99:     t = libnet_autobuild_ethernet(
                    100:             enet_dst,                               /* ethernet destination */
                    101:             ETHERTYPE_ARP,                          /* protocol type */
                    102:             l);                                     /* libnet handle */
                    103:     if (t == -1)
                    104:     {
                    105:         fprintf(stderr, "Can't build ethernet header: %s\n",
                    106:                 libnet_geterror(l));
                    107:         goto bad;
                    108:     }
                    109: 
                    110: 
                    111:     if (libnet_adv_cull_packet(l, &packet, &packet_s) == -1)
                    112:     {
                    113:         fprintf(stderr, "%s", libnet_geterror(l));
                    114:     }
                    115:     else
                    116:     {
                    117:         fprintf(stderr, "packet size: %d\n", packet_s);
                    118:         libnet_adv_free_packet(l, packet);
                    119:     }
                    120: 
                    121:     c = libnet_write(l);
                    122: 
                    123:     if (c == -1)
                    124:     {
                    125:         fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
                    126:         goto bad;
                    127:     }
                    128:     else
                    129:     {
                    130:         fprintf(stderr, "Wrote %d byte ARP packet from context \"%s\"; "
                    131:                 "check the wire.\n", c, libnet_cq_getlabel(l));
                    132:     }
                    133:     libnet_destroy(l);
                    134:     return (EXIT_SUCCESS);
                    135: bad:
                    136:     libnet_destroy(l);
                    137:     return (EXIT_FAILURE);
                    138: }
                    139: