![Ulf Lamping](/assets/img/avatar_default.png)
-use g_snprintf instead of sprintf and snprintf -use g_strdup_printf where appropriate -remove #include "snprintf.h" (as only g_snprintf should be used) -replace some more alloc/realloc/calloc/free with their glib pendants svn path=/trunk/; revision=15264
970 lines
30 KiB
C
970 lines
30 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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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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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#include <string.h>
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#include <time.h>
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#include <math.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/addr_resolv.h>
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#include "packet-ntp.h"
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/*
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* Dissecting NTP packets version 3 and 4 (RFC2030, RFC1769, RFC1361,
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* RFC1305).
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*
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* Those packets have simple structure:
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* 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |LI | VN |Mode | Stratum | Poll | Precision |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Root Delay |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Root Dispersion |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reference Identifier |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reference Timestamp (64) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Originate Timestamp (64) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Receive Timestamp (64) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Transmit Timestamp (64) |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Key Identifier (optional) (32) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Message Digest (optional) (128) |
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* | |
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* | |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* NTP timestamps are represented as a 64-bit unsigned fixed-point number,
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* in seconds relative to 0h on 1 January 1900. The integer part is in the
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* first 32 bits and the fraction part in the last 32 bits.
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*/
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#define UDP_PORT_NTP 123
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#define TCP_PORT_NTP 123
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/* Leap indicator, 2bit field is used to warn of a inserted/deleted
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* second, or to alarm loosed synchronization.
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*/
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#define NTP_LI_MASK 0xC0
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#define NTP_LI_NONE 0
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#define NTP_LI_61 1
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#define NTP_LI_59 2
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#define NTP_LI_ALARM 3
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static const value_string li_types[] = {
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{ NTP_LI_NONE, "no warning" },
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{ NTP_LI_61, "last minute has 61 seconds" },
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{ NTP_LI_59, "last minute has 59 seconds" },
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{ NTP_LI_ALARM, "alarm condition (clock not synchronized)" },
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{ 0, NULL}
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};
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/* Version info, 3bit field informs about NTP version used in particular
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* packet. According to rfc2030, version info could be only 3 or 4, but I
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* have noticed packets with 1 or even 6 as version numbers. They are
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* produced as a result of ntptrace command. Are those packets mailformed
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* on purpose? I don't know yet, probably some browsing through ntp sources
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* would help. My solution is to put them as reserved for now.
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*/
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#define NTP_VN_MASK 0x38
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static const value_string ver_nums[] = {
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{ 0, "reserved" },
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{ 1, "reserved" },
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{ 2, "reserved" },
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{ 3, "NTP Version 3" },
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{ 4, "NTP Version 4" },
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{ 5, "reserved" },
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{ 6, "reserved" },
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{ 7, "reserved" },
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{ 0, NULL}
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};
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/* Mode, 3bit field representing mode of comunication.
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*/
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#define NTP_MODE_MASK 7
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#define NTP_MODE_RSV 0
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#define NTP_MODE_SYMACT 1
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#define NTP_MODE_SYMPAS 2
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#define NTP_MODE_CLIENT 3
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#define NTP_MODE_SERVER 4
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#define NTP_MODE_BCAST 5
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#define NTP_MODE_CTRL 6
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#define NTP_MODE_PRIV 7
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static const value_string mode_types[] = {
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{ NTP_MODE_RSV, "reserved" },
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{ NTP_MODE_SYMACT, "symmetric active" },
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{ NTP_MODE_SYMPAS, "symmetric passive" },
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{ NTP_MODE_CLIENT, "client" },
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{ NTP_MODE_SERVER, "server" },
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{ NTP_MODE_BCAST, "broadcast" },
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{ NTP_MODE_CTRL, "reserved for NTP control message"},
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{ NTP_MODE_PRIV, "reserved for private use" },
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{ 0, NULL}
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};
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/* According to rfc, primary (stratum-0 and stratum-1) servers should set
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* their Reference Clock ID (4bytes field) according to following table:
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*/
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static const struct {
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const char *id;
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const char *data;
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} primary_sources[] = {
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{ "LOCL", "uncalibrated local clock" },
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{ "PPS\0", "atomic clock or other pulse-per-second source" },
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{ "ACTS", "NIST dialup modem service" },
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{ "USNO", "USNO modem service" },
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{ "PTB\0", "PTB (Germany) modem service" },
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{ "TDF\0", "Allouis (France) Radio 164 kHz" },
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{ "DCF\0", "Mainflingen (Germany) Radio 77.5 kHz" },
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{ "MSF\0", "Rugby (UK) Radio 60 kHz" },
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{ "WWV\0", "Ft. Collins (US) Radio 2.5, 5, 10, 15, 20 MHz" },
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{ "WWVB", "Boulder (US) Radio 60 kHz" },
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{ "WWVH", "Kaui Hawaii (US) Radio 2.5, 5, 10, 15 MHz" },
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{ "CHU\0", "Ottawa (Canada) Radio 3330, 7335, 14670 kHz" },
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{ "LORC", "LORAN-C radionavigation system" },
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{ "OMEG", "OMEGA radionavigation system" },
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{ "GPS\0", "Global Positioning Service" },
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{ "GOES", "Geostationary Orbit Environment Satellite" },
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{ "DCN\0", "DCN routing protocol" },
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{ "NIST", "NIST public modem" },
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{ "TSP\0", "TSP time protocol" },
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{ "DTS\0", "Digital Time Service" },
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{ "ATOM", "Atomic clock (calibrated)" },
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{ "VLF\0", "VLF radio (OMEGA,, etc.)" },
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{ "IRIG", "IRIG-B timecode" },
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{ "1PPS", "External 1 PPS input" },
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{ "FREE", "(Internal clock)" },
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{ NULL, NULL}
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};
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#define NTP_EXT_R_MASK 0x80
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static const value_string ext_r_types[] = {
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{ 0, "Request" },
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{ 1, "Response" },
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{ 0, NULL}
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};
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#define NTP_EXT_ERROR_MASK 0x40
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#define NTP_EXT_VN_MASK 0x3f
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static const value_string ext_op_types[] = {
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{ 0, "NULL" },
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{ 1, "ASSOC" },
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{ 2, "CERT" },
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{ 3, "COOK" },
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{ 4, "AUTO" },
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{ 5, "TAI" },
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{ 6, "SIGN" },
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{ 7, "IFF" },
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{ 8, "GQ" },
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{ 9, "MV" },
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{ 0, NULL}
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};
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#define NTPCTRL_R_MASK 0x80
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#define ctrl_r_types ext_r_types
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#define NTPCTRL_ERROR_MASK 0x40
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#define NTPCTRL_MORE_MASK 0x20
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#define NTPCTRL_OP_MASK 0x1f
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static const value_string ctrl_op_types[] = {
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{ 0, "UNSPEC" },
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{ 1, "READSTAT" },
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{ 2, "READVAR" },
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{ 3, "WRITEVAR" },
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{ 4, "READCLOCK" },
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{ 5, "WRITECLOCK" },
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{ 6, "SETTRAP" },
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{ 7, "ASYNCMSG" },
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{ 31, "UNSETTRAP" },
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{ 0, NULL}
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};
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#define NTPPRIV_R_MASK 0x80
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#define priv_r_types ext_r_types
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#define NTPPRIV_MORE_MASK 0x40
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#define NTPPRIV_AUTH_MASK 0x80
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#define NTPPRIV_SEQ_MASK 0x7f
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static const value_string priv_impl_types[] = {
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{ 0, "UNIV" },
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{ 2, "XNTPD_OLD (pre-IPv6)" },
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{ 3, "XNTPD" },
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{ 0, NULL}
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};
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static const value_string priv_rc_types[] = {
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{ 0, "PEER_LIST" },
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{ 1, "PEER_LIST_SUM" },
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{ 2, "PEER_INFO" },
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{ 3, "PEER_STATS" },
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{ 4, "SYS_INFO" },
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{ 5, "SYS_STATS" },
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{ 6, "IO_STATS" },
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{ 7, "MEM_STATS" },
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{ 8, "LOOP_INFO" },
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{ 9, "TIMER_STATS" },
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{ 10, "CONFIG" },
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{ 11, "UNCONFIG" },
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{ 12, "SET_SYS_FLAG" },
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{ 13, "CLR_SYS_FLAG" },
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{ 16, "GET_RESTRICT" },
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{ 17, "RESADDFLAGS" },
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{ 18, "RESSUBFLAGS" },
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{ 19, "UNRESTRICT" },
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{ 20, "MON_GETLIST" },
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{ 21, "RESET_STATS" },
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{ 22, "RESET_PEER" },
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{ 23, "REREAD_KEYS" },
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{ 26, "TRUSTKEY" },
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{ 27, "UNTRUSTKEY" },
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{ 28, "AUTHINFO" },
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{ 29, "TRAPS" },
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{ 30, "ADD_TRAP" },
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{ 31, "CLR_TRAP" },
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{ 32, "REQUEST_KEY" },
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{ 33, "CONTROL_KEY" },
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{ 34, "GET_CTLSTATS" },
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{ 36, "GET_CLOCKINFO" },
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{ 37, "SET_CLKFUDGE" },
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{ 38, "GET_KERNEL" },
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{ 39, "GET_CLKBUGINFO" },
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{ 42, "MON_GETLIST_1" },
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{ 43, "HOSTNAME_ASSOCID" },
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{ 0, NULL}
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};
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/*
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* Maximum MAC length.
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*/
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#define MAX_MAC_LEN (5 * sizeof (guint32))
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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_flags_li = -1;
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static int hf_ntp_flags_vn = -1;
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static int hf_ntp_flags_mode = -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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static int hf_ntp_ext = -1;
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static int hf_ntp_ext_flags = -1;
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static int hf_ntp_ext_flags_r = -1;
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static int hf_ntp_ext_flags_error = -1;
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static int hf_ntp_ext_flags_vn = -1;
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static int hf_ntp_ext_op = -1;
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static int hf_ntp_ext_len = -1;
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static int hf_ntp_ext_associd = -1;
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static int hf_ntp_ext_tstamp = -1;
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static int hf_ntp_ext_fstamp = -1;
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static int hf_ntp_ext_vallen = -1;
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static int hf_ntp_ext_val = -1;
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static int hf_ntp_ext_siglen = -1;
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static int hf_ntp_ext_sig = -1;
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static int hf_ntpctrl_flags2 = -1;
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static int hf_ntpctrl_flags2_r = -1;
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static int hf_ntpctrl_flags2_error = -1;
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static int hf_ntpctrl_flags2_more = -1;
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static int hf_ntpctrl_flags2_opcode = -1;
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static int hf_ntppriv_flags_r = -1;
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static int hf_ntppriv_flags_more = -1;
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static int hf_ntppriv_auth_seq = -1;
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static int hf_ntppriv_auth = -1;
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static int hf_ntppriv_seq = -1;
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static int hf_ntppriv_impl = -1;
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static int hf_ntppriv_reqcode = -1;
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static gint ett_ntp = -1;
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static gint ett_ntp_flags = -1;
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static gint ett_ntp_ext = -1;
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static gint ett_ntp_ext_flags = -1;
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static gint ett_ntpctrl_flags2 = -1;
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static gint ett_ntppriv_auth_seq = -1;
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static void dissect_ntp_std(tvbuff_t *, proto_tree *, guint8);
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static void dissect_ntp_ctrl(tvbuff_t *, proto_tree *, guint8);
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static void dissect_ntp_priv(tvbuff_t *, proto_tree *, guint8);
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static int dissect_ntp_ext(tvbuff_t *, proto_tree *, int);
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static const char *mon_names[12] = {
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"Jan",
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"Feb",
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"Mar",
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"Apr",
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"May",
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"Jun",
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"Jul",
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"Aug",
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"Sep",
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"Oct",
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"Nov",
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"Dec"
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};
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/* ntp_fmt_ts - converts NTP timestamp to human readable string.
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* reftime - 64bit timestamp (IN)
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* buff - string buffer for result (OUT)
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* returns pointer to filled buffer.
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*/
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char *
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ntp_fmt_ts(const guint8 *reftime, char* buff)
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{
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guint32 tempstmp, tempfrac;
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time_t temptime;
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struct tm *bd;
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double fractime;
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tempstmp = pntohl(&reftime[0]);
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tempfrac = pntohl(&reftime[4]);
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if ((tempstmp == 0) && (tempfrac == 0)) {
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strcpy (buff, "NULL");
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return buff;
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} else {
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temptime = tempstmp - (guint32) NTP_BASETIME;
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bd = gmtime(&temptime);
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if (bd != NULL) {
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fractime = bd->tm_sec + tempfrac / 4294967296.0;
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g_snprintf(buff, NTP_TS_SIZE,
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"%s %2d, %d %02d:%02d:%07.4f UTC",
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mon_names[bd->tm_mon],
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bd->tm_mday,
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bd->tm_year + 1900,
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bd->tm_hour,
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bd->tm_min,
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fractime);
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} else
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strncpy(buff, "Not representable", NTP_TS_SIZE);
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}
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return buff;
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}
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/* dissect_ntp - dissects NTP packet data
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* tvb - tvbuff for packet data (IN)
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* pinfo - packet info
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* proto_tree - resolved protocol tree
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*/
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static void
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dissect_ntp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *ntp_tree;
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proto_item *ti;
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guint8 flags;
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const char *infostr;
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void (*dissector)(tvbuff_t *, proto_item *, guint8);
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "NTP");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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flags = tvb_get_guint8(tvb, 0);
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switch (flags & NTP_MODE_MASK) {
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default:
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infostr = "NTP";
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dissector = dissect_ntp_std;
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break;
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case NTP_MODE_CTRL:
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infostr = "NTP control";
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dissector = dissect_ntp_ctrl;
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break;
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case NTP_MODE_PRIV:
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infostr = "NTP private";
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dissector = dissect_ntp_priv;
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break;
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}
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if (check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO, infostr);
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if (tree) {
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/* Adding NTP item and subtree */
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ti = proto_tree_add_item(tree, proto_ntp, tvb, 0, -1, FALSE);
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ntp_tree = proto_item_add_subtree(ti, ett_ntp);
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(*dissector)(tvb, ntp_tree, flags);
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}
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}
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static void
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dissect_ntp_std(tvbuff_t *tvb, proto_tree *ntp_tree, guint8 flags)
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{
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proto_tree *flags_tree;
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proto_item *tf;
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guint8 stratum;
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guint8 ppoll;
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gint8 precision;
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double rootdelay;
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double rootdispersion;
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const guint8 *refid;
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guint32 refid_addr;
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const guint8 *reftime;
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const guint8 *org;
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const guint8 *rec;
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|
const guint8 *xmt;
|
|
gchar buff[NTP_TS_SIZE];
|
|
int i;
|
|
int macofs;
|
|
gint maclen;
|
|
|
|
tf = proto_tree_add_uint(ntp_tree, hf_ntp_flags, tvb, 0, 1, flags);
|
|
|
|
/* Adding flag subtree and items */
|
|
flags_tree = proto_item_add_subtree(tf, ett_ntp_flags);
|
|
proto_tree_add_uint(flags_tree, hf_ntp_flags_li, tvb, 0, 1, flags);
|
|
proto_tree_add_uint(flags_tree, hf_ntp_flags_vn, tvb, 0, 1, flags);
|
|
proto_tree_add_uint(flags_tree, hf_ntp_flags_mode, tvb, 0, 1, flags);
|
|
|
|
/* Stratum, 1byte field represents distance from primary source
|
|
*/
|
|
stratum = tvb_get_guint8(tvb, 1);
|
|
if (stratum == 0) {
|
|
strcpy (buff, "Peer Clock Stratum: unspecified or unavailable (%u)");
|
|
} else if (stratum == 1) {
|
|
strcpy (buff, "Peer Clock Stratum: primary reference (%u)");
|
|
} else if ((stratum >= 2) && (stratum <= 15)) {
|
|
strcpy (buff, "Peer Clock Stratum: secondary reference (%u)");
|
|
} else {
|
|
strcpy (buff, "Peer Clock Stratum: reserved: %u");
|
|
}
|
|
proto_tree_add_uint_format(ntp_tree, hf_ntp_stratum, tvb, 1, 1,
|
|
stratum, buff, stratum);
|
|
/* Poll interval, 1byte field indicating the maximum interval
|
|
* between successive messages, in seconds to the nearest
|
|
* power of two.
|
|
*/
|
|
ppoll = tvb_get_guint8(tvb, 2);
|
|
proto_tree_add_uint_format(ntp_tree, hf_ntp_ppoll, tvb, 2, 1,
|
|
ppoll,
|
|
(((ppoll >= 4) && (ppoll <= 16)) ?
|
|
"Peer Polling Interval: %u (%u sec)" :
|
|
"Peer Polling Interval: invalid (%u)"),
|
|
ppoll,
|
|
1 << ppoll);
|
|
|
|
/* Precision, 1byte field indicating the precision of the
|
|
* local clock, in seconds to the nearest power of two.
|
|
*/
|
|
precision = tvb_get_guint8(tvb, 3);
|
|
proto_tree_add_int_format(ntp_tree, hf_ntp_precision, tvb, 3, 1,
|
|
precision,
|
|
"Peer Clock Precision: %8.6f sec",
|
|
pow(2, precision));
|
|
|
|
/* Root Delay is a 32-bit signed fixed-point number indicating
|
|
* the total roundtrip delay to the primary reference source,
|
|
* in seconds with fraction point between bits 15 and 16.
|
|
*/
|
|
rootdelay = ((gint16)tvb_get_ntohs(tvb, 4)) +
|
|
(tvb_get_ntohs(tvb, 6) / 65536.0);
|
|
proto_tree_add_double_format(ntp_tree, hf_ntp_rootdelay, tvb, 4, 4,
|
|
rootdelay,
|
|
"Root Delay: %9.4f sec",
|
|
rootdelay);
|
|
|
|
/* Root Dispersion, 32-bit unsigned fixed-point number indicating
|
|
* the nominal error relative to the primary reference source, in
|
|
* seconds with fraction point between bits 15 and 16.
|
|
*/
|
|
rootdispersion = ((gint16)tvb_get_ntohs(tvb, 8)) +
|
|
(tvb_get_ntohs(tvb, 10) / 65536.0);
|
|
proto_tree_add_double_format(ntp_tree, hf_ntp_rootdispersion, tvb, 8, 4,
|
|
rootdispersion,
|
|
"Clock Dispersion: %9.4f sec",
|
|
rootdispersion);
|
|
|
|
/* Now, there is a problem with secondary servers. Standards
|
|
* asks from stratum-2 - stratum-15 servers to set this to the
|
|
* low order 32 bits of the latest transmit timestamp of the
|
|
* reference source.
|
|
* But, all V3 and V4 servers set this to IP adress of their
|
|
* higher level server. My decision was to resolve this address.
|
|
*/
|
|
refid = tvb_get_ptr(tvb, 12, 4);
|
|
if (stratum <= 1) {
|
|
g_snprintf (buff, sizeof buff,
|
|
"Unindentified reference source '%.4s'",
|
|
refid);
|
|
for (i = 0; primary_sources[i].id; i++) {
|
|
if (memcmp (refid, primary_sources[i].id,
|
|
4) == 0) {
|
|
strcpy (buff, primary_sources[i].data);
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
buff[sizeof(buff) - 1] = '\0';
|
|
tvb_memcpy(tvb, (guint8 *)&refid_addr, 12, 4);
|
|
strncpy (buff, get_hostname (refid_addr),
|
|
sizeof(buff));
|
|
if (buff[sizeof(buff) - 1] != '\0')
|
|
strcpy(&buff[sizeof(buff) - 4], "...");
|
|
}
|
|
proto_tree_add_bytes_format(ntp_tree, hf_ntp_refid, tvb, 12, 4,
|
|
refid,
|
|
"Reference Clock ID: %s", buff);
|
|
|
|
/* Reference Timestamp: This is the time at which the local clock was
|
|
* last set or corrected.
|
|
*/
|
|
reftime = tvb_get_ptr(tvb, 16, 8);
|
|
proto_tree_add_bytes_format(ntp_tree, hf_ntp_reftime, tvb, 16, 8,
|
|
reftime,
|
|
"Reference Clock Update Time: %s",
|
|
ntp_fmt_ts(reftime, buff));
|
|
|
|
/* Originate Timestamp: This is the time at which the request departed
|
|
* the client for the server.
|
|
*/
|
|
org = tvb_get_ptr(tvb, 24, 8);
|
|
proto_tree_add_bytes_format(ntp_tree, hf_ntp_org, tvb, 24, 8,
|
|
org,
|
|
"Originate Time Stamp: %s",
|
|
ntp_fmt_ts(org, buff));
|
|
|
|
/* Receive Timestamp: This is the time at which the request arrived at
|
|
* the server.
|
|
*/
|
|
rec = tvb_get_ptr(tvb, 32, 8);
|
|
proto_tree_add_bytes_format(ntp_tree, hf_ntp_rec, tvb, 32, 8,
|
|
rec,
|
|
"Receive Time Stamp: %s",
|
|
ntp_fmt_ts(rec, buff));
|
|
|
|
/* Transmit Timestamp: This is the time at which the reply departed the
|
|
* server for the client.
|
|
*/
|
|
xmt = tvb_get_ptr(tvb, 40, 8);
|
|
proto_tree_add_bytes_format(ntp_tree, hf_ntp_xmt, tvb, 40, 8,
|
|
xmt,
|
|
"Transmit Time Stamp: %s",
|
|
ntp_fmt_ts(xmt, buff));
|
|
|
|
/* MAX_MAC_LEN is the largest message authentication code
|
|
* (MAC) length. If we have more data left in the packet
|
|
* after the header than that, the extra data is NTP4
|
|
* extensions; parse them as such.
|
|
*/
|
|
macofs = 48;
|
|
while (tvb_reported_length_remaining(tvb, macofs) > (gint)MAX_MAC_LEN)
|
|
macofs = dissect_ntp_ext(tvb, ntp_tree, macofs);
|
|
|
|
/* When the NTP authentication scheme is implemented, the
|
|
* Key Identifier and Message Digest fields contain the
|
|
* message authentication code (MAC) information defined in
|
|
* Appendix C of RFC-1305. Will print this as hex code for now.
|
|
*/
|
|
if (tvb_reported_length_remaining(tvb, macofs) >= 4)
|
|
proto_tree_add_item(ntp_tree, hf_ntp_keyid, tvb, macofs, 4,
|
|
FALSE);
|
|
macofs += 4;
|
|
maclen = tvb_reported_length_remaining(tvb, macofs);
|
|
if (maclen > 0)
|
|
proto_tree_add_item(ntp_tree, hf_ntp_mac, tvb, macofs,
|
|
maclen, FALSE);
|
|
}
|
|
|
|
static int
|
|
dissect_ntp_ext(tvbuff_t *tvb, proto_tree *ntp_tree, int offset)
|
|
{
|
|
proto_tree *ext_tree, *flags_tree;
|
|
proto_item *tf;
|
|
guint16 extlen;
|
|
int endoffset;
|
|
guint8 flags;
|
|
guint32 vallen, vallen_round, siglen;
|
|
|
|
extlen = tvb_get_ntohs(tvb, offset+2);
|
|
if (extlen < 8) {
|
|
/* Extension length isn't enough for the extension header.
|
|
* Report the error, and return an offset that goes to
|
|
* the end of the tvbuff, so we stop dissecting.
|
|
*/
|
|
proto_tree_add_text(ntp_tree, tvb, offset+2, 2,
|
|
"Extension length %u < 8", extlen);
|
|
offset += tvb_length_remaining(tvb, offset);
|
|
return offset;
|
|
}
|
|
if (extlen % 4) {
|
|
/* Extension length isn't a multiple of 4.
|
|
* Report the error, and return an offset that goes
|
|
* to the end of the tvbuff, so we stop dissecting.
|
|
*/
|
|
proto_tree_add_text(ntp_tree, tvb, offset+2, 2,
|
|
"Extension length %u isn't a multiple of 4",
|
|
extlen);
|
|
offset += tvb_length_remaining(tvb, offset);
|
|
return offset;
|
|
}
|
|
endoffset = offset + extlen;
|
|
|
|
tf = proto_tree_add_item(ntp_tree, hf_ntp_ext, tvb, offset, extlen,
|
|
FALSE);
|
|
ext_tree = proto_item_add_subtree(tf, ett_ntp_ext);
|
|
|
|
flags = tvb_get_guint8(tvb, offset);
|
|
tf = proto_tree_add_uint(ext_tree, hf_ntp_ext_flags, tvb, offset, 1,
|
|
flags);
|
|
flags_tree = proto_item_add_subtree(tf, ett_ntp_ext_flags);
|
|
proto_tree_add_uint(flags_tree, hf_ntp_ext_flags_r, tvb, offset, 1,
|
|
flags);
|
|
proto_tree_add_uint(flags_tree, hf_ntp_ext_flags_error, tvb, offset, 1,
|
|
flags);
|
|
proto_tree_add_uint(flags_tree, hf_ntp_ext_flags_vn, tvb, offset, 1,
|
|
flags);
|
|
offset++;
|
|
|
|
proto_tree_add_item(ext_tree, hf_ntp_ext_op, tvb, offset, 1, FALSE);
|
|
offset++;
|
|
|
|
proto_tree_add_uint(ext_tree, hf_ntp_ext_len, tvb, offset, 2, extlen);
|
|
offset += 2;
|
|
|
|
if ((flags & NTP_EXT_VN_MASK) != 2) {
|
|
/* don't care about autokey v1 */
|
|
return endoffset;
|
|
}
|
|
|
|
proto_tree_add_item(ext_tree, hf_ntp_ext_associd, tvb, offset, 4,
|
|
FALSE);
|
|
offset += 4;
|
|
|
|
/* check whether everything up to "vallen" is present */
|
|
if (extlen < MAX_MAC_LEN) {
|
|
/* XXX - report as error? */
|
|
return endoffset;
|
|
}
|
|
|
|
proto_tree_add_item(ext_tree, hf_ntp_ext_tstamp, tvb, offset, 4,
|
|
FALSE);
|
|
offset += 4;
|
|
proto_tree_add_item(ext_tree, hf_ntp_ext_fstamp, tvb, offset, 4,
|
|
FALSE);
|
|
offset += 4;
|
|
/* XXX fstamp can be server flags */
|
|
|
|
vallen = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint(ext_tree, hf_ntp_ext_vallen, tvb, offset, 4,
|
|
vallen);
|
|
offset += 4;
|
|
vallen_round = (vallen + 3) & (-4);
|
|
if (vallen != 0) {
|
|
if ((guint32)(endoffset - offset) < vallen_round) {
|
|
/*
|
|
* Value goes past the length of the extension
|
|
* field.
|
|
*/
|
|
proto_tree_add_text(ext_tree, tvb, offset,
|
|
endoffset - offset,
|
|
"Value length makes value go past the end of the extension field");
|
|
return endoffset;
|
|
}
|
|
proto_tree_add_item(ext_tree, hf_ntp_ext_val, tvb, offset,
|
|
vallen, FALSE);
|
|
}
|
|
offset += vallen_round;
|
|
|
|
siglen = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint(ext_tree, hf_ntp_ext_siglen, tvb, offset, 4,
|
|
siglen);
|
|
offset += 4;
|
|
if (siglen != 0) {
|
|
if (offset + (int)siglen > endoffset) {
|
|
/*
|
|
* Value goes past the length of the extension
|
|
* field.
|
|
*/
|
|
proto_tree_add_text(ext_tree, tvb, offset,
|
|
endoffset - offset,
|
|
"Signature length makes value go past the end of the extension field");
|
|
return endoffset;
|
|
}
|
|
proto_tree_add_item(ext_tree, hf_ntp_ext_sig, tvb,
|
|
offset, siglen, FALSE);
|
|
}
|
|
return endoffset;
|
|
}
|
|
|
|
static void
|
|
dissect_ntp_ctrl(tvbuff_t *tvb, proto_tree *ntp_tree, guint8 flags)
|
|
{
|
|
proto_tree *flags_tree;
|
|
proto_item *tf;
|
|
guint8 flags2;
|
|
|
|
tf = proto_tree_add_uint(ntp_tree, hf_ntp_flags, tvb, 0, 1, flags);
|
|
|
|
/* Adding flag subtree and items */
|
|
flags_tree = proto_item_add_subtree(tf, ett_ntp_flags);
|
|
proto_tree_add_uint(flags_tree, hf_ntp_flags_li, tvb, 0, 1, flags);
|
|
proto_tree_add_uint(flags_tree, hf_ntp_flags_vn, tvb, 0, 1, flags);
|
|
proto_tree_add_uint(flags_tree, hf_ntp_flags_mode, tvb, 0, 1, flags);
|
|
|
|
flags2 = tvb_get_guint8(tvb, 1);
|
|
tf = proto_tree_add_uint(ntp_tree, hf_ntpctrl_flags2, tvb, 1, 1,
|
|
flags2);
|
|
flags_tree = proto_item_add_subtree(tf, ett_ntpctrl_flags2);
|
|
proto_tree_add_uint(flags_tree, hf_ntpctrl_flags2_r, tvb, 1, 1,
|
|
flags2);
|
|
proto_tree_add_uint(flags_tree, hf_ntpctrl_flags2_error, tvb, 1, 1,
|
|
flags2);
|
|
proto_tree_add_uint(flags_tree, hf_ntpctrl_flags2_more, tvb, 1, 1,
|
|
flags2);
|
|
proto_tree_add_uint(flags_tree, hf_ntpctrl_flags2_opcode, tvb, 1, 1,
|
|
flags2);
|
|
}
|
|
|
|
static void
|
|
dissect_ntp_priv(tvbuff_t *tvb, proto_tree *ntp_tree, guint8 flags)
|
|
{
|
|
proto_tree *flags_tree;
|
|
proto_item *tf;
|
|
guint8 auth_seq, impl, reqcode;
|
|
|
|
tf = proto_tree_add_uint(ntp_tree, hf_ntp_flags, tvb, 0, 1, flags);
|
|
|
|
/* Adding flag subtree and items */
|
|
flags_tree = proto_item_add_subtree(tf, ett_ntp_flags);
|
|
proto_tree_add_uint(flags_tree, hf_ntppriv_flags_r, tvb, 0, 1, flags);
|
|
proto_tree_add_uint(flags_tree, hf_ntppriv_flags_more, tvb, 0, 1,
|
|
flags);
|
|
proto_tree_add_uint(flags_tree, hf_ntp_flags_vn, tvb, 0, 1, flags);
|
|
proto_tree_add_uint(flags_tree, hf_ntp_flags_mode, tvb, 0, 1, flags);
|
|
|
|
auth_seq = tvb_get_guint8(tvb, 1);
|
|
tf = proto_tree_add_uint(ntp_tree, hf_ntppriv_auth_seq, tvb, 1, 1,
|
|
auth_seq);
|
|
flags_tree = proto_item_add_subtree(tf, ett_ntppriv_auth_seq);
|
|
proto_tree_add_uint(flags_tree, hf_ntppriv_auth, tvb, 1, 1, auth_seq);
|
|
proto_tree_add_uint(flags_tree, hf_ntppriv_seq, tvb, 1, 1, auth_seq);
|
|
|
|
impl = tvb_get_guint8(tvb, 2);
|
|
proto_tree_add_uint(ntp_tree, hf_ntppriv_impl, tvb, 2, 1, impl);
|
|
|
|
reqcode = tvb_get_guint8(tvb, 3);
|
|
proto_tree_add_uint(ntp_tree, hf_ntppriv_reqcode, tvb, 3, 1, reqcode);
|
|
}
|
|
|
|
void
|
|
proto_register_ntp(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_ntp_flags, {
|
|
"Flags", "ntp.flags", FT_UINT8, BASE_HEX,
|
|
NULL, 0, "Flags (Leap/Version/Mode)", HFILL }},
|
|
{ &hf_ntp_flags_li, {
|
|
"Leap Indicator", "ntp.flags.li", FT_UINT8, BASE_DEC,
|
|
VALS(li_types), NTP_LI_MASK, "Leap Indicator", HFILL }},
|
|
{ &hf_ntp_flags_vn, {
|
|
"Version number", "ntp.flags.vn", FT_UINT8, BASE_DEC,
|
|
VALS(ver_nums), NTP_VN_MASK, "Version number", HFILL }},
|
|
{ &hf_ntp_flags_mode, {
|
|
"Mode", "ntp.flags.mode", FT_UINT8, BASE_DEC,
|
|
VALS(mode_types), NTP_MODE_MASK, "Mode", HFILL }},
|
|
{ &hf_ntp_stratum, {
|
|
"Peer Clock Stratum", "ntp.stratum", FT_UINT8, BASE_DEC,
|
|
NULL, 0, "Peer Clock Stratum", HFILL }},
|
|
{ &hf_ntp_ppoll, {
|
|
"Peer Polling Interval", "ntp.ppoll", FT_UINT8, BASE_DEC,
|
|
NULL, 0, "Peer Polling Interval", HFILL }},
|
|
{ &hf_ntp_precision, {
|
|
"Peer Clock Precision", "ntp.precision", FT_INT8, BASE_DEC,
|
|
NULL, 0, "Peer Clock Precision", HFILL }},
|
|
{ &hf_ntp_rootdelay, {
|
|
"Root Delay", "ntp.rootdelay", FT_DOUBLE, BASE_DEC,
|
|
NULL, 0, "Root Delay", HFILL }},
|
|
{ &hf_ntp_rootdispersion, {
|
|
"Clock Dispersion", "ntp.rootdispersion", FT_DOUBLE, BASE_DEC,
|
|
NULL, 0, "Clock Dispersion", HFILL }},
|
|
{ &hf_ntp_refid, {
|
|
"Reference Clock ID", "ntp.refid", FT_BYTES, BASE_NONE,
|
|
NULL, 0, "Reference Clock ID", HFILL }},
|
|
{ &hf_ntp_reftime, {
|
|
"Reference Clock Update Time", "ntp.reftime", FT_BYTES, BASE_NONE,
|
|
NULL, 0, "Reference Clock Update Time", HFILL }},
|
|
{ &hf_ntp_org, {
|
|
"Originate Time Stamp", "ntp.org", FT_BYTES, BASE_NONE,
|
|
NULL, 0, "Originate Time Stamp", HFILL }},
|
|
{ &hf_ntp_rec, {
|
|
"Receive Time Stamp", "ntp.rec", FT_BYTES, BASE_NONE,
|
|
NULL, 0, "Receive Time Stamp", HFILL }},
|
|
{ &hf_ntp_xmt, {
|
|
"Transmit Time Stamp", "ntp.xmt", FT_BYTES, BASE_NONE,
|
|
NULL, 0, "Transmit Time Stamp", HFILL }},
|
|
{ &hf_ntp_keyid, {
|
|
"Key ID", "ntp.keyid", FT_BYTES, BASE_HEX,
|
|
NULL, 0, "Key ID", HFILL }},
|
|
{ &hf_ntp_mac, {
|
|
"Message Authentication Code", "ntp.mac", FT_BYTES, BASE_HEX,
|
|
NULL, 0, "Message Authentication Code", HFILL }},
|
|
|
|
{ &hf_ntp_ext, {
|
|
"Extension", "ntp.ext", FT_NONE, BASE_NONE,
|
|
NULL, 0, "Extension", HFILL }},
|
|
{ &hf_ntp_ext_flags, {
|
|
"Flags", "ntp.ext.flags", FT_UINT8, BASE_HEX,
|
|
NULL, 0, "Flags (Response/Error/Version)", HFILL }},
|
|
{ &hf_ntp_ext_flags_r, {
|
|
"Response bit", "ntp.ext.flags.r", FT_UINT8, BASE_DEC,
|
|
VALS(ext_r_types), NTP_EXT_R_MASK, "Response bit", HFILL }},
|
|
{ &hf_ntp_ext_flags_error, {
|
|
"Error bit", "ntp.ext.flags.error", FT_UINT8, BASE_DEC,
|
|
NULL, NTP_EXT_ERROR_MASK, "Error bit", HFILL }},
|
|
{ &hf_ntp_ext_flags_vn, {
|
|
"Version", "ntp.ext.flags.vn", FT_UINT8, BASE_DEC,
|
|
NULL, NTP_EXT_VN_MASK, "Version", HFILL }},
|
|
{ &hf_ntp_ext_op, {
|
|
"Opcode", "ntp.ext.op", FT_UINT8, BASE_DEC,
|
|
VALS(ext_op_types), 0, "Opcode", HFILL }},
|
|
{ &hf_ntp_ext_len, {
|
|
"Extension length", "ntp.ext.len", FT_UINT16, BASE_DEC,
|
|
NULL, 0, "Extension length", HFILL }},
|
|
{ &hf_ntp_ext_associd, {
|
|
"Association ID", "ntp.ext.associd", FT_UINT32, BASE_DEC,
|
|
NULL, 0, "Association ID", HFILL }},
|
|
{ &hf_ntp_ext_tstamp, {
|
|
"Timestamp", "ntp.ext.tstamp", FT_UINT32, BASE_HEX,
|
|
NULL, 0, "Timestamp", HFILL }},
|
|
{ &hf_ntp_ext_fstamp, {
|
|
"File Timestamp", "ntp.ext.fstamp", FT_UINT32, BASE_HEX,
|
|
NULL, 0, "File Timestamp", HFILL }},
|
|
{ &hf_ntp_ext_vallen, {
|
|
"Value length", "ntp.ext.vallen", FT_UINT32, BASE_DEC,
|
|
NULL, 0, "Value length", HFILL }},
|
|
{ &hf_ntp_ext_val, {
|
|
"Value", "ntp.ext.val", FT_BYTES, BASE_HEX,
|
|
NULL, 0, "Value", HFILL }},
|
|
{ &hf_ntp_ext_siglen, {
|
|
"Signature length", "ntp.ext.siglen", FT_UINT32, BASE_DEC,
|
|
NULL, 0, "Signature length", HFILL }},
|
|
{ &hf_ntp_ext_sig, {
|
|
"Signature", "ntp.ext.sig", FT_BYTES, BASE_HEX,
|
|
NULL, 0, "Signature", HFILL }},
|
|
|
|
{ &hf_ntpctrl_flags2, {
|
|
"Flags 2", "ntpctrl.flags2", FT_UINT8, BASE_HEX,
|
|
NULL, 0, "Flags (Response/Error/More/Opcode)", HFILL }},
|
|
{ &hf_ntpctrl_flags2_r, {
|
|
"Response bit", "ntpctrl.flags2.r", FT_UINT8, BASE_DEC,
|
|
VALS(ctrl_r_types), NTPCTRL_R_MASK, "Response bit", HFILL }},
|
|
{ &hf_ntpctrl_flags2_error, {
|
|
"Error bit", "ntpctrl.flags2.error", FT_UINT8, BASE_DEC,
|
|
NULL, NTPCTRL_ERROR_MASK, "Error bit", HFILL }},
|
|
{ &hf_ntpctrl_flags2_more, {
|
|
"More bit", "ntpctrl.flags2.more", FT_UINT8, BASE_DEC,
|
|
NULL, NTPCTRL_MORE_MASK, "More bit", HFILL }},
|
|
{ &hf_ntpctrl_flags2_opcode, {
|
|
"Opcode", "ntpctrl.flags2.opcode", FT_UINT8, BASE_DEC,
|
|
VALS(ctrl_op_types), NTPCTRL_OP_MASK, "Opcode", HFILL }},
|
|
|
|
{ &hf_ntppriv_flags_r, {
|
|
"Response bit", "ntppriv.flags.r", FT_UINT8, BASE_DEC,
|
|
VALS(priv_r_types), NTPPRIV_R_MASK, "Response bit", HFILL }},
|
|
{ &hf_ntppriv_flags_more, {
|
|
"More bit", "ntppriv.flags.more", FT_UINT8, BASE_DEC,
|
|
NULL, NTPPRIV_MORE_MASK, "More bit", HFILL }},
|
|
{ &hf_ntppriv_auth_seq, {
|
|
"Auth, sequence", "ntppriv.auth_seq", FT_UINT8, BASE_DEC,
|
|
NULL, 0, "Auth bit, sequence number", HFILL }},
|
|
{ &hf_ntppriv_auth, {
|
|
"Auth bit", "ntppriv.auth", FT_UINT8, BASE_DEC,
|
|
NULL, NTPPRIV_AUTH_MASK, "Auth bit", HFILL }},
|
|
{ &hf_ntppriv_seq, {
|
|
"Sequence number", "ntppriv.seq", FT_UINT8, BASE_DEC,
|
|
NULL, NTPPRIV_SEQ_MASK, "Sequence number", HFILL }},
|
|
{ &hf_ntppriv_impl, {
|
|
"Implementation", "ntppriv.impl", FT_UINT8, BASE_DEC,
|
|
VALS(priv_impl_types), 0, "Implementation", HFILL }},
|
|
{ &hf_ntppriv_reqcode, {
|
|
"Request code", "ntppriv.reqcode", FT_UINT8, BASE_DEC,
|
|
VALS(priv_rc_types), 0, "Request code", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_ntp,
|
|
&ett_ntp_flags,
|
|
&ett_ntp_ext,
|
|
&ett_ntp_ext_flags,
|
|
&ett_ntpctrl_flags2,
|
|
&ett_ntppriv_auth_seq,
|
|
};
|
|
|
|
proto_ntp = proto_register_protocol("Network Time Protocol", "NTP",
|
|
"ntp");
|
|
proto_register_field_array(proto_ntp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_ntp(void)
|
|
{
|
|
dissector_handle_t ntp_handle;
|
|
|
|
ntp_handle = create_dissector_handle(dissect_ntp, proto_ntp);
|
|
dissector_add("udp.port", UDP_PORT_NTP, ntp_handle);
|
|
dissector_add("tcp.port", TCP_PORT_NTP, ntp_handle);
|
|
}
|