/* *  $Id: libnet_build_vrrp.c,v 1.6 2003/09/23 22:36:55 mike Exp $ * *  libnet *  libnet_build_vrrp.c - VRRP packet assembler * *  Copyright (c) 1998 - 2003 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#if (!(_WIN32) || (__CYGWIN__)) 
#include "../include/libnet.h"
#else
#include "../include/win32/libnet.h"
#endiflibnet_ptag_tlibnet_build_vrrp(u_int8_t version, u_int8_t type, u_int8_t vrouter_id, u_int8_t priority,            u_int8_t ip_count, u_int8_t auth_type, u_int8_t advert_int, u_int16_t             sum, u_int8_t *payload, u_int32_t payload_s, libnet_t *l,            libnet_ptag_t ptag){    u_int32_t n, h;    libnet_pblock_t *p;    struct libnet_vrrp_hdr vrrp_hdr;    if (l == NULL)    {         return (-1);    }     n = LIBNET_VRRP_H + payload_s;    h = LIBNET_VRRP_H + payload_s;    /*     *  Find the existing protocol block if a ptag is specified, or create     *  a new one.     */    p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_VRRP_H);    if (p == NULL)    {        return (-1);    }	memset(&vrrp_hdr, 0, sizeof(vrrp_hdr));	vrrp_hdr.vrrp_v          = version;    vrrp_hdr.vrrp_t          = type;    vrrp_hdr.vrrp_vrouter_id = vrouter_id;    vrrp_hdr.vrrp_priority   = priority;    vrrp_hdr.vrrp_ip_count   = ip_count;    vrrp_hdr.vrrp_auth_type  = auth_type;    vrrp_hdr.vrrp_advert_int = advert_int;    vrrp_hdr.vrrp_sum        = sum;    n = libnet_pblock_append(l, p, (u_int8_t *)&vrrp_hdr, LIBNET_VRRP_H);    if (n == -1)    {        goto bad;    }    if ((payload && !payload_s) || (!payload && payload_s))    {        snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,			    "%s(): payload inconsistency\n", __func__);        goto bad;    }    if (payload && payload_s)    {        n = libnet_pblock_append(l, p, payload, payload_s);        if (n == -1)        {            goto bad;        }    }    if (sum == 0)    {        /*         *  If checksum is zero, by default libnet will compute a checksum         *  for the user.  The programmer can override this by calling         *  libnet_toggle_checksum(l, ptag, 1);         */        libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);    }    return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_VRRP_H));bad:    libnet_pblock_delete(l, p);    return (-1);}/* EOF */