/*

 *

 * libnet 1.1

 * Build a IPv4 packet with what you want as payload

 *

 * Copyright (c) 2003 Frédéric Raynal <pappy@security-labs.org>

 * All rights reserved.

 *

 * Ex:

 * - send an UDP packet from port 4369 to port 8738

 *    ./ip -s 1.1.1.1 -d 2.2.2.2

 *

 * - send a TCP SYN from port 4369 to port 8738

 *   ./ip -s 1.1.1.1 -d 2.2.2.2 -t -p `printf "\x04\x57\x08\xae\x01\x01\x01\x01\x02\x02\x02\x02\x50\x02\x7f\xff\xd5\x91\x41\x41"`

 *

 *

 * 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;

    libnet_t *l;

    char *device = NULL;

    char *dst = "2.2.2.2", *src = "1.1.1.1";

    u_long src_ip, dst_ip;

    char errbuf[LIBNET_ERRBUF_SIZE];

    libnet_ptag_t ip_ptag = 0;

    u_short proto = IPPROTO_UDP;

    u_char payload[255] = {0x11, 0x11, 0x22, 0x22, 0x00, 0x08, 0xc6, 0xa5};

    u_long payload_s = 8;

    printf("libnet 1.1 packet shaping: IP + payload[raw]\n");

    /*

     * handle options

     */ 

    while ((c = getopt(argc, argv, "d:s:tp:i:h")) != EOF)

    {

        switch (c)

        {

            case 'd':

		dst = optarg;

                break;

            case 's':

		src = optarg;

                break;

	    case 'i':

		device = optarg;

		break;

	    case 't':

		proto = IPPROTO_TCP;

		break;

	    case 'p':

		strncpy(payload, optarg, sizeof(payload)-1);

		payload_s = strlen(payload);

		break;

	    case 'h':

		usage(argv[0]);

		exit(EXIT_SUCCESS);

            default:

                exit(EXIT_FAILURE);

        }

    }

    /*

     *  Initialize the library.  Root priviledges are required.

     */

    l = libnet_init(

	    LIBNET_RAW4,                            /* injection type */

	    device,                                 /* network interface */

            errbuf);                                /* error buffer */

    printf("Using device %s\n", l->device);

    if (l == NULL)

    {

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

        exit(EXIT_FAILURE); 

    }

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

    {

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

	exit(EXIT_FAILURE);

    }

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

    {

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

	exit(EXIT_FAILURE);

    }

    /*

     * Build the packet

     */ 

    ip_ptag = libnet_build_ipv4(

        LIBNET_IPV4_H + payload_s,                  /* length */

        0,                                          /* TOS */

        242,                                        /* IP ID */

        0,                                          /* IP Frag */

        64,                                         /* TTL */

        proto,                                      /* protocol */

        0,                                          /* checksum */

        src_ip,                                     /* source IP */

        dst_ip,                                     /* destination IP */

        payload,                                    /* payload */

        payload_s,                                  /* payload size */

        l,                                          /* libnet handle */

        ip_ptag);                                   /* libnet id */

    if (ip_ptag == -1)

    {

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

        goto bad;

    }

    /*

     *  Write it to the wire.

     */

    c = libnet_write(l);

    if (c == -1)

    {

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

        goto bad;

    }

    else

    {

        fprintf(stderr, "Wrote %d byte IP 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 [-s source_ip] [-d destination_ip]"

	    " [-i iface] [-p payload] [-t]\n",

	    name);

}

/* EOF */