![Guy Harris](/assets/img/avatar_default.png)
statements. Move the setting of the Protocol column in various dissectors before anything is fetched from the packet, and also clear the Info column at that point in those and some other dissectors, so that if an exception is thrown, the columns don't reflect the previous protocol. Don't use col_add_fstr(..., "%s", string); Use col_add_str(..., string); as it does the same thing, but doesn't drag all the heavy *printf machinery in. Fix the DDTP dissector to set the Info column regardless of whether we're building a protocol tree or not, and to set it to "Encrypted payload" if the payload is encrypted. Also fix a typo in a field name. Register the FTP data dissector as being associated with the FTP data protocol, not the FTP protocol (the removed "CHECK_DISPLAY_AS_DATA()" call checked "proto_ftp_data", and the removed "pinfo->current_proto =" line set it to "FTP-DATA", so it should be associated with "proto_ftp_data"). Make the H1 dissector check whether the frame has at least 2 bytes in it before checking the first two bytes; heuristic dissectors must not throw exceptions until they've accepted the packet as one of theirs. Use "tvb_format_text()" rather than "tvb_get_ptr()" and "format_text()" in some dissectors where the result of "tvb_get_ptr()" is used only in the "format_text()" call. In the Quake dissector, don't check whether there are at least 4 bytes in the packet - if we return, the packet won't be dissected at all (it's not as if some other dissector will get to handle it), and, if we don't return, we'll throw an exception if there aren't at least 4 bytes in the packet, so the packet will be marked as short or malformed, as appropriate. In the RIPng dissector, associate the table of strings for the command field with the command field, so that the dissector doesn't have to format the string for the protocol tree entry itself, and so that the filter construction dialog box can let you select "Request" or "Response" from a list rather than requiring you to know the values for "Request" and "Response". Make "dissect_rpc()" static, as it's called only through a heuristic dissector list. Use "col_set_str()" to set the COL_PROTOCOL column for RPC protocols; the string used is from a table provided by the dissector, and is a string constant. Don't format the Info column for WSP into a buffer and then format that buffer into the column with "%s" - "col_add_fstr()" can do the formatting for you, without having to allocate your own buffer (or run through the *printf machinery twice). Don't fetch fields from the WTP packet until you're ready to use them, so that you don't throw an exception before you even set the Protocol column or clear the Info column. Use "pinfo->destport", not "pi.destport", in the Zebra dissector when checking whether the packet is a request or reply, and do the check by comparing with "pinfo->match_port" rather than TCP_PORT_ZEBRA (so that if the dissector is ever registered on another port, it still correctly determines whether the packet is a request or reply - the Network Monitor HTTP dissector has port 80 wired into its brain, which is a bit irritating if you're trying to get it to dissect HTTP proxy traffic on port 3128 or proxy administration UI traffic on port 3132). svn path=/trunk/; revision=2931
504 lines
17 KiB
C
504 lines
17 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 1.25 2001/01/22 08:03:45 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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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 <time.h>
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#include <math.h>
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#include <glib.h>
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#ifdef NEED_SNPRINTF_H
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# include "snprintf.h"
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#endif
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#include "packet.h"
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#include "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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char *id;
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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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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 gint ett_ntp = -1;
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static gint ett_ntp_flags = -1;
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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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static char *
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ntp_fmt_ts(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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fractime = bd->tm_sec + tempfrac / 4294967296.0;
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snprintf(buff, NTP_TS_SIZE, "%04d-%02d-%02d %02d:%02d:%07.4f UTC",
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bd->tm_year + 1900, bd->tm_mon + 1, bd->tm_mday,
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bd->tm_hour, bd->tm_min, fractime);
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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, *flags_tree;
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proto_item *ti, *tf;
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guint8 flags;
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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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guint8 *refid;
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guint8 *reftime;
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guint8 *org;
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guint8 *rec;
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guint8 *xmt;
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gchar buff[NTP_TS_SIZE];
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int i;
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_set_str(pinfo->fd, COL_PROTOCOL, "NTP");
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if (check_col(pinfo->fd, COL_INFO))
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col_set_str(pinfo->fd, COL_INFO, "NTP");
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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,
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tvb_length(tvb), FALSE);
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ntp_tree = proto_item_add_subtree(ti, ett_ntp);
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flags = tvb_get_guint8(tvb, 0);
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tf = proto_tree_add_uint(ntp_tree, hf_ntp_flags, tvb, 0, 1,
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flags);
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/* Adding flag subtree and items */
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flags_tree = proto_item_add_subtree(tf, ett_ntp_flags);
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proto_tree_add_uint(flags_tree, hf_ntp_flags_li, tvb, 0, 1,
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flags);
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proto_tree_add_uint(flags_tree, hf_ntp_flags_vn, tvb, 0, 1,
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flags);
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proto_tree_add_uint(flags_tree, hf_ntp_flags_mode, tvb, 0, 1,
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flags);
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/* Stratum, 1byte field represents distance from primary source
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*/
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stratum = tvb_get_guint8(tvb, 1);
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if (stratum == 0) {
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strcpy (buff, "Peer Clock Stratum: unspecified or unavailable (%u)");
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} else if (stratum == 1) {
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strcpy (buff, "Peer Clock Stratum: primary reference (%u)");
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} else if ((stratum >= 2) && (stratum <= 15)) {
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strcpy (buff, "Peer Clock Stratum: secondary reference (%u)");
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} else {
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strcpy (buff, "Peer Clock Stratum: reserved: %u");
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}
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proto_tree_add_uint_format(ntp_tree, hf_ntp_stratum, tvb, 1, 1,
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stratum, buff, stratum);
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/* Poll interval, 1byte field indicating the maximum interval
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* between successive messages, in seconds to the nearest
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* power of two.
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*/
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ppoll = tvb_get_guint8(tvb, 2);
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proto_tree_add_uint_format(ntp_tree, hf_ntp_ppoll, tvb, 2, 1,
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ppoll,
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(((ppoll >= 4) && (ppoll <= 16)) ?
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"Peer Pooling Interval: %u (%u sec)" :
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"Peer Pooling Interval: invalid (%u)"),
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ppoll,
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1 << ppoll);
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/* Precision, 1byte field indicating the precision of the
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* local clock, in seconds to the nearest power of two.
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*/
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precision = tvb_get_guint8(tvb, 3);
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proto_tree_add_uint_format(ntp_tree, hf_ntp_precision, tvb, 3, 1,
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precision,
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"Peer Clock Precision: %8.6f sec",
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pow(2, precision));
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/* Root Delay is a 32-bit signed fixed-point number indicating
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* the total roundtrip delay to the primary reference source,
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* in seconds with fraction point between bits 15 and 16.
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*/
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rootdelay = ((gint16)tvb_get_ntohs(tvb, 4)) +
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(tvb_get_ntohs(tvb, 6) / 65536.0);
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proto_tree_add_double_format(ntp_tree, hf_ntp_rootdelay, tvb, 4, 4,
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rootdelay,
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"Root Delay: %9.4f sec",
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rootdelay);
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/* Root Dispersion, 32-bit unsigned fixed-point number indicating
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* the nominal error relative to the primary reference source, in
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* seconds with fraction point between bits 15 and 16.
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*/
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rootdispersion = ((gint16)tvb_get_ntohs(tvb, 8)) +
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(tvb_get_ntohs(tvb, 10) / 65536.0);
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proto_tree_add_double_format(ntp_tree, hf_ntp_rootdispersion, tvb, 8, 4,
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rootdispersion,
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"Clock Dispersion: %9.4f sec",
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rootdispersion);
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/* Now, there is a problem with secondary servers. Standards
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* asks from stratum-2 - stratum-15 servers to set this to the
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* low order 32 bits of the latest transmit timestamp of the
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* reference source.
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* But, all V3 and V4 servers set this to IP adress of their
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* higher level server. My decision was to resolve this address.
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*/
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refid = tvb_get_ptr(tvb, 12, 4);
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if (stratum <= 1) {
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snprintf (buff, sizeof buff,
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"Unindentified reference source '%.4s'",
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refid);
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for (i = 0; primary_sources[i].id; i++) {
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if (memcmp (refid, primary_sources[i].id,
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4) == 0) {
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strcpy (buff, primary_sources[i].data);
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break;
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}
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}
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} else {
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buff[sizeof(buff) - 1] = '\0';
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strncpy (buff, get_hostname (tvb_get_ntohl(tvb, 12)),
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sizeof(buff));
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if (buff[sizeof(buff) - 1] != '\0')
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strcpy(&buff[sizeof(buff) - 4], "...");
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}
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proto_tree_add_bytes_format(ntp_tree, hf_ntp_refid, tvb, 12, 4,
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refid,
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"Reference Clock ID: %s", buff);
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/* Reference Timestamp: This is the time at which the local clock was
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* last set or corrected.
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*/
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reftime = tvb_get_ptr(tvb, 16, 8);
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proto_tree_add_bytes_format(ntp_tree, hf_ntp_reftime, tvb, 16, 8,
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reftime,
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"Reference Clock Update Time: %s",
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ntp_fmt_ts(reftime, buff));
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/* Originate Timestamp: This is the time at which the request departed
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* the client for the server.
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*/
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org = tvb_get_ptr(tvb, 24, 8);
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proto_tree_add_bytes_format(ntp_tree, hf_ntp_org, tvb, 24, 8,
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org,
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"Originate Time Stamp: %s",
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ntp_fmt_ts(org, buff));
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/* Receive Timestamp: This is the time at which the request arrived at
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* the server.
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*/
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rec = tvb_get_ptr(tvb, 32, 8);
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proto_tree_add_bytes_format(ntp_tree, hf_ntp_rec, tvb, 32, 8,
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|
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));
|
|
|
|
/* 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, 48) >= 4 )
|
|
proto_tree_add_item(ntp_tree, hf_ntp_keyid, tvb, 48, 4,
|
|
FALSE);
|
|
if ( tvb_reported_length_remaining(tvb, 52) > 0 )
|
|
proto_tree_add_item(ntp_tree, hf_ntp_mac, tvb, 52,
|
|
tvb_reported_length_remaining(tvb, 52),
|
|
FALSE);
|
|
|
|
}
|
|
}
|
|
|
|
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)" }},
|
|
{ &hf_ntp_flags_li, {
|
|
"Leap Indicator", "ntp.flags.li", FT_UINT8, BASE_DEC,
|
|
VALS(li_types), NTP_LI_MASK, "Leap Indicator" }},
|
|
{ &hf_ntp_flags_vn, {
|
|
"Version number", "ntp.flags.vn", FT_UINT8, BASE_DEC,
|
|
VALS(ver_nums), NTP_VN_MASK, "Version number" }},
|
|
{ &hf_ntp_flags_mode, {
|
|
"Mode", "ntp.flags.mode", FT_UINT8, BASE_DEC,
|
|
VALS(mode_types), NTP_MODE_MASK, "Mode" }},
|
|
{ &hf_ntp_stratum, {
|
|
"Peer Clock Stratum", "ntp.stratum", FT_UINT8, BASE_DEC,
|
|
NULL, 0, "Peer Clock Stratum" }},
|
|
{ &hf_ntp_ppoll, {
|
|
"Peer Polling Interval", "ntp.ppoll", FT_UINT8, BASE_DEC,
|
|
NULL, 0, "Peer Polling Interval" }},
|
|
{ &hf_ntp_precision, {
|
|
"Peer Clock Precision", "ntp.precision", FT_UINT8, BASE_DEC,
|
|
NULL, 0, "Peer Clock Precision" }},
|
|
{ &hf_ntp_rootdelay, {
|
|
"Root Delay", "ntp.rootdelay", FT_DOUBLE, BASE_DEC,
|
|
NULL, 0, "Root Delay" }},
|
|
{ &hf_ntp_rootdispersion, {
|
|
"Clock Dispersion", "ntp.rootdispersion", FT_DOUBLE, BASE_DEC,
|
|
NULL, 0, "Clock Dispersion" }},
|
|
{ &hf_ntp_refid, {
|
|
"Reference Clock ID", "ntp.refid", FT_BYTES, BASE_NONE,
|
|
NULL, 0, "Reference Clock ID" }},
|
|
{ &hf_ntp_reftime, {
|
|
"Reference Clock Update Time", "ntp.reftime", FT_BYTES, BASE_NONE,
|
|
NULL, 0, "Reference Clock Update Time" }},
|
|
{ &hf_ntp_org, {
|
|
"Originate Time Stamp", "ntp.org", FT_BYTES, BASE_NONE,
|
|
NULL, 0, "Originate Time Stamp" }},
|
|
{ &hf_ntp_rec, {
|
|
"Receive Time Stamp", "ntp.rec", FT_BYTES, BASE_NONE,
|
|
NULL, 0, "Receive Time Stamp" }},
|
|
{ &hf_ntp_xmt, {
|
|
"Transmit Time Stamp", "ntp.xmt", FT_BYTES, BASE_NONE,
|
|
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" }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_ntp,
|
|
&ett_ntp_flags,
|
|
};
|
|
|
|
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_add("udp.port", UDP_PORT_NTP, dissect_ntp, proto_ntp);
|
|
dissector_add("tcp.port", TCP_PORT_NTP, dissect_ntp, proto_ntp);
|
|
}
|