/*

 *  $Id: ospf_hello.c,v 1.3 2004/11/09 07:05:07 mike Exp $

 *

 *  libnet 1.1

 *  Build an OSPF Hello packet

 *

 *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>

 *  All rights reserved.

 *

 *  Copyright (c) 1999, 2000 Andrew Reiter <areiter@bindview.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;

    libnet_t *l;

    libnet_ptag_t t;

    u_long src, dst;

    char errbuf[LIBNET_ERRBUF_SIZE];

    char *to, *from;

    u_char auth[8] = {0,0,0,0,0,0,0,0};

    printf("libnet 1.1 OSPF Hello packet shaping[raw]\n");

    if (argc != 3) 

    {

        usage(argv[0]);

    }

    from        = argv[1];

    to          = argv[2];

    /*

     *  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", errbuf);

        exit(EXIT_FAILURE);

    }

    /* Too lazy to check for error */

    src = libnet_name2addr4(l, from, LIBNET_DONT_RESOLVE);

    dst = libnet_name2addr4(l, to, LIBNET_DONT_RESOLVE);

    t = libnet_build_ospfv2_hello(

        0xffffffff,                                 /* netmask */

        2,                                          /* interval */

        0x00,                                       /* options */

        0x00,                                       /* priority */

        30,                                         /* dead int */

        src,                                        /* router */

        src,                                        /* router */

        NULL,                                       /* payload */

        0,                                          /* payload size */

        l,                                          /* libnet handle */

        0);                                         /* libnet id */

    if (t == -1)

    {

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

        goto bad;

    }

    /* authentication data */

    t = libnet_build_data(

        auth,                                       /* auth data */

        LIBNET_OSPF_AUTH_H,                         /* payload size */

        l,                                          /* libnet handle */

        0);                                         /* libnet id */

    if (t == -1)

    {

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

        goto bad;

    }

    t = libnet_build_ospfv2(

        LIBNET_OSPF_HELLO_H + LIBNET_OSPF_AUTH_H,   /* OSPF packet length */

        LIBNET_OSPF_HELLO,                          /* OSPF packet type */

        htonl(0xd000000d),                          /* router id */

        htonl(0xc0ffee00),                          /* area id */

        0,                                          /* checksum */

        LIBNET_OSPF_AUTH_NULL,                      /* auth type */

        NULL,                                       /* payload */

        0,                                          /* payload size */

        l,                                          /* libnet handle */

        0);                                         /* libnet id */

    if (t == -1)

    {

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

        goto bad;

    }

    t = libnet_build_ipv4(

        LIBNET_IPV4_H + LIBNET_OSPF_H +

        LIBNET_OSPF_HELLO_H + LIBNET_OSPF_AUTH_H,   /* packet total legnth */

        0,                                          /* TOS */

        101,                                        /* IP iD */

        IP_DF,                                      /* IP frag */

        254,                                        /* TTL */

        IPPROTO_OSPF,                               /* protocol */

        0,                                          /* checksum */

        src,                                        /* source IP */

        dst,                                        /* 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 OSPF packet; check the wire.\n", c);

    }

    libnet_destroy(l);

    return (EXIT_SUCCESS);

bad:

    libnet_destroy(l);

    return (EXIT_FAILURE);

}

void

usage(char *pname)

{

    printf("Usage: %s <source ip> <dest. ip> <neighbor>\n", pname);

    exit(EXIT_SUCCESS);

}