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