/*

 *

 *  libnet 1.1

 *  Build a Sebek packet

 *

 *  Copyright (c) 2004 Frederic Raynal <pappy@security-labs.org>

 *  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)

#if ((_WIN32) && !(__CYGWIN__)) 

#include "../include/win32/config.h"

#else

#include "../include/config.h"

#endif

#endif

#include "./libnet_test.h"

void usage(char *name)

{

    fprintf(stderr,

           "usage: %s [-D eth_dst] [-s source_ip] [-d destination_ip]"

           "[-u UDP port] [-m magic] [-v version] [-t type] [-S sec] [-U usec] [-P PID] [-I UID] [-f FD] [-c cmd]"

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

           name);

}

int

main(int argc, char *argv[])

{

    int c, port = 1101;

    libnet_t *l;

    char *device = NULL;

    char *eth_dst = "11:11:11:11:11:11";

    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 ptag = 0;

    u_char *payload = 0;

    char payload_flag = 0;

    u_long payload_s = 0;

    unsigned int magic = 0x0defaced, 

	counter = 0x12345678,

	sec = 0, usec = 0,

	pid = 1,

	uid = 666,

	fd = 2;

    char *cmd = "./h4ckw0r1D";

    unsigned int length = strlen(cmd)+1;

    unsigned short version = SEBEK_PROTO_VERSION, type = SEBEK_TYPE_READ;

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

    /*

     * handle options

     */ 

    while ((c = getopt(argc, argv, "D:d:s:u:m:v:t:S:U:P:I:f:c:p:i:h")) != EOF)

    {

        switch (c)

        {

            case 'D':

		eth_dst = optarg;

                break;

            case 'd':

		dst = optarg;

                break;

            case 's':

		src = optarg;

                break;

	    case 'i':

		device = optarg;

		break;

	    case 'u':

		port = atoi(optarg);

		break;

	    case 'm':

		magic = strtoul(optarg, NULL, 10);

		break;

	    case 'v':

		version = (unsigned short) strtoul(optarg, NULL, 10);

		break;

	    case 't':

		type = (unsigned short) strtoul(optarg, NULL, 10);

		break;

	    case 'S':

		sec = strtoul(optarg, NULL, 10);

		break;

	    case 'U':

		usec = strtoul(optarg, NULL, 10);

		break;

	    case 'P':

		pid = strtoul(optarg, NULL, 10);

		break;

	    case 'I':

		uid = strtoul(optarg, NULL, 10);

		break;

	    case 'f':

		fd = strtoul(optarg, NULL, 10);

		break;

	    case 'c':

		cmd = optarg; 

		length = strlen(cmd);

		break;

	    case 'p':

		payload_flag = 1;

		payload = optarg; 

		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_LINK_ADV,                        /* injection type */

	    device,                                 /* network interface */

            errbuf);                                /* error buffer */

    if (l == NULL)

    {

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

        exit(EXIT_FAILURE); 

    }

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

    if (payload_flag)

    {

	memset(cmd, 0, sizeof(cmd));

	memcpy(cmd, payload, (payload_s < 12 ? payload_s : 12));

	length = payload_s;

    }

    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);

    }

    if (!payload)

    {

	payload = cmd;

	payload_s = length;

    }

    ptag = libnet_build_sebek(

	magic,

	version,

	type,

	counter,

	sec,

	usec,

	pid,

	uid,

	fd,

	cmd,

	/* LIBNET_ETH_H + LIBNET_IPV4_H + LIBNET_UDP_H + LIBNET_SEBEK_H +*/ length,

	payload,

	payload_s,

	l,

	0

	);

    if (ptag == -1)

    {

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

	goto bad;

    }

    ptag = libnet_build_udp(

	port,                                      /* source port */

	port,                                      /* destination port */

	LIBNET_UDP_H + LIBNET_SEBEK_H + payload_s, /* packet length */

	0,                                         /* checksum */

	NULL,                                      /* payload */

	0,                                         /* payload size */

	l,                                         /* libnet handle */

	0);                                        /* libnet id */

    if (ptag == -1)

    {

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

	goto bad;

    }

    ptag = libnet_build_ipv4(

	LIBNET_IPV4_H + LIBNET_UDP_H + LIBNET_SEBEK_H + payload_s,/* length */

	0,                                          /* TOS */

	242,                                        /* IP ID */

	0,                                          /* IP Frag */

	64,                                         /* TTL */

	IPPROTO_UDP,                                /* protocol */

	0,                                          /* checksum */

	src_ip,                                     /* source IP */

	dst_ip,                                     /* destination IP */

	NULL,                                       /* payload */

	0,                                          /* payload size */

	l,                                          /* libnet handle */

	0);                                         /* libnet id */

    if (ptag == -1)

    {

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

	exit(EXIT_FAILURE);

    }

    eth_dst = libnet_hex_aton(eth_dst, &c);

    ptag = libnet_autobuild_ethernet(

	eth_dst,                                /* ethernet destination */

	ETHERTYPE_IP,                           /* protocol type */

	l);                                     /* libnet handle */

    free(eth_dst);

    if (ptag == -1)

    {

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

                libnet_geterror(l));

        goto bad;

    }

    /*

     * write 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 Sebek packet; check the wire.\n", c);

    }

    libnet_destroy(l);

    return (EXIT_SUCCESS);

  bad:

    libnet_destroy(l);

    return (EXIT_FAILURE);

    return 0;

}