/*

 *  $Id: udp1.c,v 1.6 2004/03/01 20:26:12 mike Exp $

 *

 *  libnet 1.1

 *  Build a UDP packet

 *

 *  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"

#ifdef __WIN32__

#include "../include/win32/getopt.h"

#endif

int

main(int argc, char *argv[])

{

    int c, i, j, build_ip;

    char *cp;

    libnet_t *l;

    libnet_ptag_t ip, ipo;

    libnet_ptag_t udp;

    char *payload;

    u_short payload_s;

    struct libnet_stats ls;

    u_long src_ip, dst_ip;

    u_short src_prt, dst_prt;

    u_char opt[20];

    char errbuf[LIBNET_ERRBUF_SIZE];

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

    /*

     *  Initialize the library.  Root priviledges are required.

     */

    l = libnet_init(

            LIBNET_RAW4,                            /* injection type */

            NULL,                                   /* network interface */

            errbuf);                                /* errbuf */

    if (l == NULL)

    {

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

        exit(EXIT_FAILURE);

    }

    src_ip  = 0;

    dst_ip  = 0;

    src_prt = 0;

    dst_prt = 0;

    payload = NULL;

    payload_s = 0;

    ip = ipo = udp = 0;

    while ((c = getopt(argc, argv, "d:s: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 (!(cp = strrchr(optarg, '.')))

                {

                    usage(argv[0]);

                }

                *cp++ = 0;

                dst_prt = (u_short)atoi(cp);

                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 (!(cp = strrchr(optarg, '.')))

                {

                    usage(argv[0]);

                }

                *cp++ = 0;

                src_prt = (u_short)atoi(cp);

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

                {

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

                    exit(EXIT_FAILURE);

                }

                break;

            case 'p':

                payload = optarg;

                payload_s = strlen(payload);

                break;

            default:

                exit(EXIT_FAILURE);

        }

    }

    if (!src_ip || !src_prt || !dst_ip || !dst_prt)

    {

        usage(argv[0]);

        exit(EXIT_FAILURE);

    }

    for (build_ip = 0, i = 0; i < 10; i++)

    {

        udp = libnet_build_udp(

            src_prt,                                /* source port */

            dst_prt + i,                            /* destination port */

            LIBNET_UDP_H + payload_s,               /* packet length */

            0,                                      /* checksum */

            (uint8_t*)payload,                     /* payload */

            payload_s,                              /* payload size */

            l,                                      /* libnet handle */

            udp);                                   /* libnet id */

        if (udp == -1)

        {

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

            goto bad;

        }

        if (1)

        {

            build_ip = 0;

            /* this is not a legal options string */

            for (j = 0; j < 20; j++)

            {

                opt[j] = libnet_get_prand(LIBNET_PR2);

            }

            ipo = libnet_build_ipv4_options(

                opt,

                20,

                l,

                ipo);

            if (ipo == -1)

            {

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

                goto bad;

            }

            ip = libnet_build_ipv4(

                LIBNET_IPV4_H + 20 + payload_s + LIBNET_UDP_H, /* length */

                0,                                          /* TOS */

                242,                                        /* IP ID */

                0,                                          /* IP Frag */

                64,                                         /* TTL */

                IPPROTO_UDP,                                /* protocol */

                0,                                          /* checksum */

                src_ip,

                dst_ip,

                NULL,                                       /* payload */

                0,                                          /* payload size */

                l,                                          /* libnet handle */

               ip);                                         /* libnet id */

            if (ip == -1)

            {

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

                goto bad;

            }

        }

        /*

         *  Write it to the wire.

         */

        fprintf(stderr, "%d byte packet, ready to go\n",

            libnet_getpacket_size(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 UDP packet; check the wire.\n", c);

        }

    }

    libnet_stats(l, &ls);

    fprintf(stderr, "Packets sent:  %lld\n"

                    "Packet errors: %lld\n"

                    "Bytes written: %lld\n",

                    ls.packets_sent, ls.packet_errors, ls.bytes_written);

    libnet_destroy(l);

    return (EXIT_SUCCESS);

bad:

    libnet_destroy(l);

    return (EXIT_FAILURE);

}

void

usage(char *name)

{

    fprintf(stderr,

        "usage: %s -s source_ip.source_port -d destination_ip.destination_port"

        " [-p payload]\n",

        name);

}

/* EOF */