/*

 *

 * libnet 1.1

 * Build a BGP4 header with what you want as payload

 *

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

 * All rights reserved.

 *

 *

 * Example:

 *

 *   Sending of a BGP KEEPALIVE

 *

 *   # ./bgp4_hdr -s 1.1.1.1 -d 2.2.2.2 -t 4

 *   libnet 1.1 packet shaping: BGP4 hdr + payload[raw]

 *   Wrote 59 byte TCP packet; check the wire.

 *   

 *   13:55:53.811579 1.1.1.1.26214 > 2.2.2.2.179: S [tcp sum ok] 

 *            16843009:16843028(19) win 32767: BGP (ttl 64, id 242, len 59)

 *   0x0000   4500 003b 00f2 0000 4006 73c6 0101 0101        E..;....@.s.....

 *   0x0010   0202 0202 6666 00b3 0101 0101 0202 0202        ....ff..........

 *   0x0020   5002 7fff b090 0000 0101 0101 0101 0101        P...............

 *   0x0030   0101 0101 0101 0101 0013 04                    ...........

 *   

 *

 * 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;

    u_long src_ip, dst_ip, length;

    libnet_ptag_t t = 0;

    char errbuf[LIBNET_ERRBUF_SIZE];

    u_char *payload = NULL;

    u_long payload_s = 0;

    u_char marker[LIBNET_BGP4_MARKER_SIZE];

    u_char type;

    printf("libnet 1.1 packet shaping: BGP4 hdr + payload[raw]\n");

    l = libnet_init(

            LIBNET_RAW4,                            /* injection type */

            NULL,                                   /* network interface */

            errbuf);                                /* error buffer */

    if (l == NULL)

    {

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

        exit(EXIT_FAILURE); 

    }

    src_ip  = 0;

    dst_ip  = 0;

    memset(marker, 0x1, LIBNET_BGP4_MARKER_SIZE);

    type = 0;

    while ((c = getopt(argc, argv, "d:s:t:m:p:")) != EOF)

    {

        switch (c)

        {

            /*

             *  We expect the input to be of the form `ip.ip.ip.ip.port`.  We

             *  point cp to the last dot of the IP address/port string and

             *  then seperate them with a NULL byte.  The optarg now points to

             *  just the IP address, and cp points to the port.

             */

            case 'd':

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

                {

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

                    exit(EXIT_FAILURE);

                }

                break;

            case 's':

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

                {

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

                    exit(EXIT_FAILURE);

                }

                break;

	    case 'm':

		memcpy(marker, optarg, LIBNET_BGP4_MARKER_SIZE);

		break;

	    case 't':

		type = atoi(optarg);

		break;

	    case 'p':

		payload = optarg;

		payload_s = strlen(optarg);

		break;

            default:

                exit(EXIT_FAILURE);

        }

    }

    if (!src_ip || !dst_ip)

    {

        usage(argv[0]);

        exit(EXIT_FAILURE);

    }

    length = LIBNET_BGP4_HEADER_H + payload_s;

    t = libnet_build_bgp4_header(

	marker,                                     /* marker */   

	length,                                     /* length */

	type,                                       /* message type */

        payload,                                    /* payload */

        payload_s,                                  /* payload size */

        l,                                          /* libnet handle */

        0);                                         /* libnet id */

    if (t == -1)

    {

        fprintf(stderr, "Can't build BGP4 header: %s\n", libnet_geterror(l));

        goto bad;

    }

    length+=LIBNET_TCP_H;

    t = libnet_build_tcp(

        0x6666,                                     /* source port */

        179,                                        /* destination port */

        0x01010101,                                 /* sequence number */

        0x02020202,                                 /* acknowledgement num */

        TH_SYN,                                     /* control flags */

        32767,                                      /* window size */

        0,                                          /* checksum */

        0,                                          /* urgent pointer */

	length,                                     /* TCP packet size */

        NULL,                                       /* payload */

        0,                                          /* payload size */

        l,                                          /* libnet handle */

        0);                                         /* libnet id */

    if (t == -1)

    {

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

        goto bad;

    }

    length+=LIBNET_IPV4_H;

    t = libnet_build_ipv4(

        length,                                     /* length */

        0,                                          /* TOS */

        242,                                        /* IP ID */

        0,                                          /* IP Frag */

        64,                                         /* TTL */

        IPPROTO_TCP,                                /* protocol */

        0,                                          /* checksum */

        src_ip,                                     /* source IP */

        dst_ip,                                     /* destination IP */

        NULL,                                       /* payload */

        0,                                          /* payload size */

        l,                                          /* libnet handle */

        0);                                         /* libnet id */

    if (t == -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 TCP 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"

        " [-m marker] [-p payload] [-t BGP type]\n",

        name);

}

/* EOF */