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/* packet-ntp.c
* Routines for NTP packet dissection
* Copyright 1999, Nathan Neulinger <nneul@umr.edu>
*
* $Id: packet-ntp.c,v 1.1 1999/10/14 05:10:30 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@unicom.net>
* Copyright 1998 Gerald Combs
*
* Copied from packet-tftp.c
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <string.h>
#include <glib.h>
#include "packet.h"
#include "packet-ntp.h"
static int proto_ntp = -1;
static int hf_ntp_flags = -1;
static int hf_ntp_stratum = -1;
static int hf_ntp_ppoll = -1;
static int hf_ntp_precision = -1;
static int hf_ntp_rootdelay = -1;
static int hf_ntp_rootdispersion = -1;
static int hf_ntp_refid = -1;
static int hf_ntp_reftime = -1;
static int hf_ntp_org = -1;
static int hf_ntp_rec = -1;
static int hf_ntp_xmt = -1;
static int hf_ntp_keyid = -1;
static int hf_ntp_mac = -1;
void
dissect_ntp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
{
proto_tree *ntp_tree, *ti;
struct ntp_packet *pkt;
/* get at least a full packet structure */
if ( !BYTES_ARE_IN_FRAME(offset, 48) ) /* 48 without keyid or mac */
return;
pkt = (struct ntp_packet *) &pd[offset];
if (check_col(fd, COL_PROTOCOL))
col_add_str(fd, COL_PROTOCOL, "NTP");
if (check_col(fd, COL_INFO))
col_add_str(fd, COL_INFO, "NTP");
if (tree) {
ti = proto_tree_add_item(tree, proto_ntp, offset, END_OF_FRAME, NULL);
ntp_tree = proto_item_add_subtree(ti, ETT_NTP);
proto_tree_add_item(ntp_tree, hf_ntp_flags, offset, 1, pkt->flags);
proto_tree_add_item(ntp_tree, hf_ntp_stratum, offset+1, 1, pkt->stratum);
proto_tree_add_item(ntp_tree, hf_ntp_ppoll, offset+2, 1, pkt->ppoll);
proto_tree_add_item(ntp_tree, hf_ntp_precision, offset+3, 1, pkt->precision);
proto_tree_add_item(ntp_tree, hf_ntp_rootdelay, offset+4, 4, pkt->rootdelay);
proto_tree_add_item(ntp_tree, hf_ntp_rootdispersion, offset+8, 4, pkt->rootdispersion);
proto_tree_add_item(ntp_tree, hf_ntp_refid, offset+12, 4, pkt->refid);
proto_tree_add_item(ntp_tree, hf_ntp_reftime, offset+16, 8, pkt->reftime);
proto_tree_add_item(ntp_tree, hf_ntp_org, offset+24, 8, pkt->org);
proto_tree_add_item(ntp_tree, hf_ntp_rec, offset+32, 8, pkt->rec);
proto_tree_add_item(ntp_tree, hf_ntp_xmt, offset+40, 8, pkt->xmt);
if ( BYTES_ARE_IN_FRAME(offset, 50) )
proto_tree_add_item(ntp_tree, hf_ntp_keyid, offset+48, 4, pkt->keyid);
if ( BYTES_ARE_IN_FRAME(offset, 53) )
proto_tree_add_item(ntp_tree, hf_ntp_mac, offset+52, END_OF_FRAME, pkt->mac);
}
}
void
proto_register_ntp(void)
{
static hf_register_info hf[] = {
{ &hf_ntp_flags, {
"Flags", "ntp.flags", FT_BYTES, BASE_HEX,
NULL, 0, "Flags (Leap/Version/Mode)" }},
{ &hf_ntp_stratum, {
"Peer Clock Stratum", "ntp.stratum", FT_BYTES, BASE_HEX,
NULL, 0, "Peer Clock Stratum" }},
{ &hf_ntp_ppoll, {
"Peer Polling Interval", "ntp.ppoll", FT_BYTES, BASE_HEX,
NULL, 0, "Peer Polling Interval" }},
{ &hf_ntp_precision, {
"Peer Clock Precision", "ntp.precision", FT_BYTES, BASE_HEX,
NULL, 0, "Peer Clock Precision" }},
{ &hf_ntp_rootdelay, {
"Distance to Primary", "ntp.rootdelay", FT_BYTES, BASE_HEX,
NULL, 0, "Distance to Primary" }},
{ &hf_ntp_rootdispersion, {
"Clock Dispersion", "ntp.rootdispersion", FT_BYTES, BASE_HEX,
NULL, 0, "Clock Dispersion" }},
{ &hf_ntp_refid, {
"Reference Clock ID", "ntp.refid", FT_BYTES, BASE_HEX,
NULL, 0, "Reference Clock ID" }},
{ &hf_ntp_reftime, {
"Reference Clock Update Time", "ntp.reftime", FT_BYTES, BASE_HEX,
NULL, 0, "Reference Clock Update Time" }},
{ &hf_ntp_org, {
"Originate Time Stamp", "ntp.org", FT_BYTES, BASE_HEX,
NULL, 0, "Originate Time Stamp" }},
{ &hf_ntp_rec, {
"Receive Time Stamp", "ntp.rec", FT_BYTES, BASE_HEX,
NULL, 0, "Receive Time Stamp" }},
{ &hf_ntp_xmt, {
"Transmit Time Stamp", "ntp.xmt", FT_BYTES, BASE_HEX,
NULL, 0, "Transmit Time Stamp" }},
{ &hf_ntp_keyid, {
"Key ID", "ntp.keyid", FT_BYTES, BASE_HEX,
NULL, 0, "Key ID" }},
{ &hf_ntp_mac, {
"Message Authentication Code", "ntp.mac", FT_BYTES, BASE_HEX,
NULL, 0, "Message Authentication Code" }},
};
proto_ntp = proto_register_protocol("Network Time Protocol", "ntp");
proto_register_field_array(proto_ntp, hf, array_length(hf));
}
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