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/*
* $Id: libnet_build_ntp.c,v 1.11 2004/11/09 07:05:07 mike Exp $
*
* libnet
* libnet_build_ntp.c - NTP packet assembler
*
* 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_ntp(uint8_t leap_indicator, uint8_t version, uint8_t mode,
uint8_t stratum, uint8_t poll, uint8_t precision, uint16_t delay_int,
uint16_t delay_frac, uint16_t dispersion_int, uint16_t dispersion_frac,
uint32_t reference_id, uint32_t ref_ts_int, uint32_t ref_ts_frac,
uint32_t orig_ts_int, uint32_t orig_ts_frac, uint32_t rec_ts_int,
uint32_t rec_ts_frac, uint32_t xmt_ts_int, uint32_t xmt_ts_frac,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_ntp_hdr ntp_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_NTP_H + payload_s;
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_NTP_H);
if (p == NULL)
{
return (-1);
}
memset(&ntp_hdr, 0, sizeof(ntp_hdr));
ntp_hdr.ntp_li_vn_mode = LIBNET_NTP_DO_LI_VN_MODE(
leap_indicator, version, mode);
ntp_hdr.ntp_stratum = stratum;
ntp_hdr.ntp_poll = poll;
ntp_hdr.ntp_precision = precision;
ntp_hdr.ntp_delay.integer = htons(delay_int);
ntp_hdr.ntp_delay.fraction = htons(delay_frac);
ntp_hdr.ntp_dispersion.integer = htons(dispersion_int);
ntp_hdr.ntp_dispersion.fraction = htons(dispersion_frac);
ntp_hdr.ntp_reference_id = htonl(reference_id);
ntp_hdr.ntp_ref_ts.integer = htonl(ref_ts_int);
ntp_hdr.ntp_ref_ts.fraction = htonl(ref_ts_frac);
ntp_hdr.ntp_orig_ts.integer = htonl(orig_ts_int);
ntp_hdr.ntp_orig_ts.fraction = htonl(orig_ts_frac);
ntp_hdr.ntp_rec_ts.integer = htonl(rec_ts_int);
ntp_hdr.ntp_rec_ts.fraction = htonl(rec_ts_frac);
ntp_hdr.ntp_xmt_ts.integer = htonl(xmt_ts_int);
ntp_hdr.ntp_xmt_ts.fraction = htonl(xmt_ts_frac);
n = libnet_pblock_append(l, p, (uint8_t *)&ntp_hdr, LIBNET_NTP_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_NTP_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
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