/*

 *  $Id: icmp_unreach.c,v 1.4 2004/03/16 18:40:59 mike Exp $

 *

 *  libnet 1.1

 *  Build an ICMP unreachable packet

 *

 *  Hacked by Frederic Raynal <pappy@security-labs.org> to illustrate

 *  the new API of ICMP error messages fixing Aaron's bugs.

 *

 *  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, i;

    libnet_t *l = NULL;

    libnet_ptag_t ip_err = 0, icmp = 0, ip = 0, eth = 0;

    u_long src_ip, dst_ip; 

    u_char payload[8] = {0x11, 0x11, 0x22, 0x22, 0x00, 0x08, 0xc6, 0xa5};

    u_long payload_s = 8;

    int mode = LIBNET_LINK;

    char errbuf[LIBNET_ERRBUF_SIZE];

    printf("libnet 1.1 packet shaping: ICMP unreachable[link]\n"); 

    src_ip = 0;

    dst_ip = 0;

    while((c = getopt(argc, argv, "d:s:r")) != EOF)

    {

        switch (c)

        {

            case 'd':

                if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)

                {

                    fprintf(stderr, "Bad destination IP address: %s\n", optarg);

                    exit(1);

                }

                break;

            case 's':

                if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)

                {

                    fprintf(stderr, "Bad source IP address: %s\n", optarg);

                    exit(1);

                }

                break;

            case 'r':

                mode = LIBNET_RAW4;

                break;

        }

    }

    if (!src_ip || !dst_ip)

    {

        usage(argv[0]);

        exit(EXIT_FAILURE);

    }

    /*

     *  Initialize the library.  Root priviledges are required.

     */

    l = libnet_init(

            mode,                            /* injection type */

            NULL,                                   /* network interface */

            errbuf);                                /* errbuf */

    if (l == NULL)

    {

        fprintf(stderr, "libnet_init() failed: %s", errbuf);

        exit(EXIT_FAILURE);

    }

    for (i=0; i<255; i++)

    {

        ip_err = libnet_build_ipv4(

        LIBNET_IPV4_H + payload_s,              /* o length */

        IPTOS_LOWDELAY | IPTOS_THROUGHPUT,      /* o IP tos */

        (uint16_t)i,                           /* o IP ID */

        0,                                      /* o frag */

        64,                                     /* o TTL */

        IPPROTO_UDP,                            /* o protocol */

        0,                                      /* o checksum */

        dst_ip,                                 /* o source IP */

        src_ip,                                 /* o destination IP */

        payload,                                /* payload */

        payload_s,                              /* payload size */

        l,

        ip_err);

    if (ip_err == -1)

    {

        fprintf(stderr, "Can't build error IPv4 header: %s\n", 

                libnet_geterror(l));

        goto bad;

    }

    icmp = libnet_build_icmpv4_unreach(

        ICMP_UNREACH,                               /* type */

        ICMP_UNREACH_PORT,                          /* code */

        0,                                          /* checksum */

        NULL,                                       /* payload */

        0,                                          /* payload size */

        l,                                          /* libnet handle */

        icmp);

    if (icmp == -1)

    {

        fprintf(stderr, "Can't build ICMP header: %s\n", libnet_geterror(l));

        goto bad;

    }

    ip = libnet_build_ipv4(

        LIBNET_IPV4_H + LIBNET_ICMPV4_UNREACH_H +

        LIBNET_IPV4_H + payload_s,                  /* length */

        IPTOS_LOWDELAY | IPTOS_THROUGHPUT,          /* TOS */

        (uint16_t)i + 1,                           /* IP ID */

        0,                                          /* IP Frag */

        64,                                         /* TTL */

        IPPROTO_ICMP,                               /* protocol */

        0,                                          /* checksum */

        src_ip,                                     /* source IP */

        dst_ip,                                     /* destination IP */

        NULL,                                       /* payload */

        0,                                          /* payload size */

        l,                                          /* libnet handle */

        ip);

    if (ip == -1)

    {

        fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));

        goto bad;

    }

    if (mode == LIBNET_LINK) {

    eth = libnet_build_ethernet(

       enet_dst,                                   /* ethernet destination */

        enet_src,                                   /* ethernet source */

        ETHERTYPE_IP,                               /* protocol type */

        NULL,                                       /* payload */

        0,                                          /* payload size */

        l,                                          /* libnet handle */

        eth);                                         /* libnet id */

    if (eth == -1)

    {

        fprintf(stderr, "Can't build ethernet header: %s\n", libnet_geterror(l));

        goto bad;

    }

    }

    /*

     *  Write it to the wire.

     */

    libnet_diag_dump_pblock(l);

    c = libnet_write(l);

    if (c == -1)

    {

        fprintf(stderr, "Write error: %s\n", libnet_geterror(l));

        goto bad;

    }

    else

    {

        fprintf(stderr, "Wrote %d byte ICMP packet; check the wire.\n", c);

    }

}

    libnet_destroy(l);

    return (EXIT_SUCCESS);

bad:

    libnet_destroy(l);

    return (EXIT_FAILURE);

}

void

usage(char *name)

{

    fprintf(stderr, "usage: %s [-r] -s source_ip -d destination_ip\n ", name);

}

/* EOF */