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/*
* libnet
* libnet_build_hsrp.c - HSRP packet assembler
*
* Copyright (c) 2004 David Barroso Berrueta <tomac@wasahero.org>
* 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.
*
*/
#include "common.h"
libnet_ptag_t
libnet_build_hsrp(uint8_t version, uint8_t opcode, uint8_t state,
uint8_t hello_time, uint8_t hold_time, uint8_t priority, uint8_t group,
uint8_t reserved, uint8_t authdata[HSRP_AUTHDATA_LENGTH], uint32_t virtual_ip,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n;
libnet_pblock_t *p;
struct libnet_hsrp_hdr hsrp_hdr;
if (l == NULL)
{
return (-1);
}
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, LIBNET_HSRP_H + payload_s, LIBNET_PBLOCK_HSRP_H);
if (p == NULL)
{
return (-1);
}
memset(&hsrp_hdr, 0, sizeof(hsrp_hdr));
hsrp_hdr.version = version;
hsrp_hdr.opcode = opcode;
hsrp_hdr.state = state;
hsrp_hdr.hello_time = hello_time;
hsrp_hdr.hold_time = hold_time;
hsrp_hdr.priority = priority;
hsrp_hdr.group = group;
hsrp_hdr.reserved = reserved;
memcpy(hsrp_hdr.authdata, authdata, HSRP_AUTHDATA_LENGTH*sizeof(uint8_t));
hsrp_hdr.virtual_ip = virtual_ip;
n = libnet_pblock_append(l, p, (uint8_t *)&hsrp_hdr, LIBNET_HSRP_H);
if (n == -1)
{
goto bad;
}
if (payload_s && !payload)
{
snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
"%s(): payload inconsistency", __func__);
goto bad;
}
if (payload_s)
{
n = libnet_pblock_append(l, p, payload, payload_s);
if (n == -1)
{
goto bad;
}
}
return (ptag ? ptag : libnet_pblock_update(l, p, 0, LIBNET_PBLOCK_HSRP_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
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