1996-08-19 20:34:12 +00:00
|
|
|
/*
|
1998-09-15 19:36:32 +00:00
|
|
|
* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
|
1996-08-19 20:34:12 +00:00
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|
* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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|
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* modification, are permitted provided that: (1) source code distributions
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|
* retain the above copyright notice and this paragraph in its entirety, (2)
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|
* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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|
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* By Jeffrey Mogul/DECWRL
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|
|
* loosely based on print-bootp.c
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|
*/
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|
2017-01-31 19:17:06 +00:00
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|
|
/* \summary: Network Time Protocol (NTP) printer */
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|
2023-05-10 15:02:34 +00:00
|
|
|
/*
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|
|
|
* specification:
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*
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|
|
|
* RFC 1119 - NTPv2
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|
|
* RFC 1305 - NTPv3
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* RFC 5905 - NTPv4
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|
|
*/
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|
|
2000-01-30 00:45:58 +00:00
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|
|
#ifdef HAVE_CONFIG_H
|
2023-05-10 15:02:34 +00:00
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|
#include <config.h>
|
1996-08-19 20:34:12 +00:00
|
|
|
#endif
|
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
#include "netdissect-stdinc.h"
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2004-03-31 09:17:26 +00:00
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|
|
#include <time.h>
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2017-01-31 19:17:06 +00:00
|
|
|
#include "netdissect.h"
|
1996-08-19 20:34:12 +00:00
|
|
|
#include "addrtoname.h"
|
2004-03-31 09:17:26 +00:00
|
|
|
#include "extract.h"
|
2015-01-06 19:03:11 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
#include "ntp.h"
|
|
|
|
|
2015-01-06 19:03:11 +00:00
|
|
|
/*
|
|
|
|
* Based on ntp.h from the U of MD implementation
|
|
|
|
* This file is based on Version 2 of the NTP spec (RFC1119).
|
|
|
|
*/
|
|
|
|
|
|
|
|
/* rfc2030
|
|
|
|
* 1 2 3
|
|
|
|
* 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
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* |LI | VN |Mode | Stratum | Poll | Precision |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* | Root Delay |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* | Root Dispersion |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* | Reference Identifier |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* | |
|
|
|
|
* | Reference Timestamp (64) |
|
|
|
|
* | |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* | |
|
|
|
|
* | Originate Timestamp (64) |
|
|
|
|
* | |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* | |
|
|
|
|
* | Receive Timestamp (64) |
|
|
|
|
* | |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* | |
|
|
|
|
* | Transmit Timestamp (64) |
|
|
|
|
* | |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* | Key Identifier (optional) (32) |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* | |
|
|
|
|
* | |
|
|
|
|
* | Message Digest (optional) (128) |
|
|
|
|
* | |
|
|
|
|
* | |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
*/
|
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
/* Length of the NTP data message with the mandatory fields ("the header")
|
|
|
|
* and without any optional fields (extension, Key Identifier,
|
|
|
|
* Message Digest).
|
|
|
|
*/
|
|
|
|
#define NTP_TIMEMSG_MINLEN 48U
|
|
|
|
|
|
|
|
struct ntp_time_data {
|
|
|
|
nd_uint8_t status; /* status of local clock and leap info */
|
|
|
|
nd_uint8_t stratum; /* Stratum level */
|
|
|
|
nd_int8_t ppoll; /* poll value */
|
|
|
|
nd_int8_t precision;
|
2015-01-06 19:03:11 +00:00
|
|
|
struct s_fixedpt root_delay;
|
|
|
|
struct s_fixedpt root_dispersion;
|
2023-05-10 15:02:34 +00:00
|
|
|
nd_uint32_t refid;
|
2015-01-06 19:03:11 +00:00
|
|
|
struct l_fixedpt ref_timestamp;
|
|
|
|
struct l_fixedpt org_timestamp;
|
|
|
|
struct l_fixedpt rec_timestamp;
|
|
|
|
struct l_fixedpt xmt_timestamp;
|
2023-05-10 15:02:34 +00:00
|
|
|
nd_uint32_t key_id;
|
|
|
|
nd_uint8_t message_digest[20];
|
2015-01-06 19:03:11 +00:00
|
|
|
};
|
|
|
|
/*
|
|
|
|
* Leap Second Codes (high order two bits)
|
|
|
|
*/
|
|
|
|
#define NO_WARNING 0x00 /* no warning */
|
|
|
|
#define PLUS_SEC 0x40 /* add a second (61 seconds) */
|
|
|
|
#define MINUS_SEC 0x80 /* minus a second (59 seconds) */
|
|
|
|
#define ALARM 0xc0 /* alarm condition (clock unsynchronized) */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Clock Status Bits that Encode Version
|
|
|
|
*/
|
|
|
|
#define NTPVERSION_1 0x08
|
|
|
|
#define VERSIONMASK 0x38
|
2023-05-10 15:02:34 +00:00
|
|
|
#define VERSIONSHIFT 3
|
2015-01-06 19:03:11 +00:00
|
|
|
#define LEAPMASK 0xc0
|
2023-05-10 15:02:34 +00:00
|
|
|
#define LEAPSHIFT 6
|
1998-09-15 19:36:32 +00:00
|
|
|
#ifdef MODEMASK
|
1996-08-19 20:34:12 +00:00
|
|
|
#undef MODEMASK /* Solaris sucks */
|
1998-09-15 19:36:32 +00:00
|
|
|
#endif
|
2015-01-06 19:03:11 +00:00
|
|
|
#define MODEMASK 0x07
|
2023-05-10 15:02:34 +00:00
|
|
|
#define MODESHIFT 0
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2015-01-06 19:03:11 +00:00
|
|
|
/*
|
|
|
|
* Code values
|
|
|
|
*/
|
|
|
|
#define MODE_UNSPEC 0 /* unspecified */
|
|
|
|
#define MODE_SYM_ACT 1 /* symmetric active */
|
|
|
|
#define MODE_SYM_PAS 2 /* symmetric passive */
|
|
|
|
#define MODE_CLIENT 3 /* client */
|
|
|
|
#define MODE_SERVER 4 /* server */
|
|
|
|
#define MODE_BROADCAST 5 /* broadcast */
|
2023-05-10 15:02:34 +00:00
|
|
|
#define MODE_CONTROL 6 /* control message */
|
2015-01-06 19:03:11 +00:00
|
|
|
#define MODE_RES2 7 /* reserved */
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2015-01-06 19:03:11 +00:00
|
|
|
/*
|
|
|
|
* Stratum Definitions
|
|
|
|
*/
|
|
|
|
#define UNSPECIFIED 0
|
|
|
|
#define PRIM_REF 1 /* radio clock */
|
|
|
|
#define INFO_QUERY 62 /* **** THIS implementation dependent **** */
|
|
|
|
#define INFO_REPLY 63 /* **** THIS implementation dependent **** */
|
|
|
|
|
|
|
|
static void p_sfix(netdissect_options *ndo, const struct s_fixedpt *);
|
|
|
|
static void p_ntp_delta(netdissect_options *, const struct l_fixedpt *, const struct l_fixedpt *);
|
2023-05-10 15:02:34 +00:00
|
|
|
static void p_poll(netdissect_options *, const int);
|
2015-01-06 19:03:11 +00:00
|
|
|
|
|
|
|
static const struct tok ntp_mode_values[] = {
|
2005-05-29 18:17:16 +00:00
|
|
|
{ MODE_UNSPEC, "unspecified" },
|
|
|
|
{ MODE_SYM_ACT, "symmetric active" },
|
|
|
|
{ MODE_SYM_PAS, "symmetric passive" },
|
|
|
|
{ MODE_CLIENT, "Client" },
|
|
|
|
{ MODE_SERVER, "Server" },
|
|
|
|
{ MODE_BROADCAST, "Broadcast" },
|
2023-05-10 15:02:34 +00:00
|
|
|
{ MODE_CONTROL, "Control Message" },
|
2005-05-29 18:17:16 +00:00
|
|
|
{ MODE_RES2, "Reserved" },
|
|
|
|
{ 0, NULL }
|
|
|
|
};
|
|
|
|
|
2015-01-06 19:03:11 +00:00
|
|
|
static const struct tok ntp_leapind_values[] = {
|
2005-05-29 18:17:16 +00:00
|
|
|
{ NO_WARNING, "" },
|
|
|
|
{ PLUS_SEC, "+1s" },
|
|
|
|
{ MINUS_SEC, "-1s" },
|
|
|
|
{ ALARM, "clock unsynchronized" },
|
|
|
|
{ 0, NULL }
|
|
|
|
};
|
|
|
|
|
2015-01-06 19:03:11 +00:00
|
|
|
static const struct tok ntp_stratum_values[] = {
|
2010-10-28 16:23:25 +00:00
|
|
|
{ UNSPECIFIED, "unspecified" },
|
2023-05-10 15:02:34 +00:00
|
|
|
{ PRIM_REF, "primary reference" },
|
2010-10-28 16:23:25 +00:00
|
|
|
{ 0, NULL }
|
|
|
|
};
|
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
/* draft-ietf-ntp-mode-6-cmds-02
|
|
|
|
* 0 1 2 3
|
|
|
|
* 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
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* |LI | VN |Mode |R|E|M| OpCode | Sequence Number |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* | Status | Association ID |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* | Offset | Count |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* | |
|
|
|
|
* / Data (up to 468 bytes) /
|
|
|
|
* | |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* | Padding (optional) |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
* | |
|
|
|
|
* / Authenticator (optional, 96 bytes) /
|
|
|
|
* | |
|
|
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
*
|
|
|
|
* Figure 1: NTP Control Message Header
|
1996-08-19 20:34:12 +00:00
|
|
|
*/
|
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
/* Length of the NTP control message with the mandatory fields ("the header")
|
|
|
|
* and without any optional fields (Data, Padding, Authenticator).
|
|
|
|
*/
|
|
|
|
#define NTP_CTRLMSG_MINLEN 12U
|
|
|
|
|
|
|
|
struct ntp_control_data {
|
|
|
|
nd_uint8_t magic; /* LI, VN, Mode */
|
|
|
|
nd_uint8_t control; /* R, E, M, OpCode */
|
|
|
|
nd_uint16_t sequence; /* Sequence Number */
|
|
|
|
nd_uint16_t status; /* Status */
|
|
|
|
nd_uint16_t assoc; /* Association ID */
|
|
|
|
nd_uint16_t offset; /* Offset */
|
|
|
|
nd_uint16_t count; /* Count */
|
|
|
|
nd_uint8_t data[564]; /* Data, [Padding, [Authenticator]] */
|
|
|
|
};
|
2015-01-06 19:03:11 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
/*
|
|
|
|
* Print NTP time requests and responses
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
ntp_time_print(netdissect_options *ndo,
|
|
|
|
const struct ntp_time_data *bp, u_int length)
|
|
|
|
{
|
|
|
|
uint8_t stratum;
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
if (length < NTP_TIMEMSG_MINLEN)
|
|
|
|
goto invalid;
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
stratum = GET_U_1(bp->stratum);
|
|
|
|
ND_PRINT(", Stratum %u (%s)",
|
|
|
|
stratum,
|
|
|
|
tok2str(ntp_stratum_values, (stratum >=2 && stratum<=15) ? "secondary reference" : "reserved", stratum));
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_PRINT(", poll %d", GET_S_1(bp->ppoll));
|
|
|
|
p_poll(ndo, GET_S_1(bp->ppoll));
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_PRINT(", precision %d", GET_S_1(bp->precision));
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_TCHECK_SIZE(&bp->root_delay);
|
|
|
|
ND_PRINT("\n\tRoot Delay: ");
|
2015-01-06 19:03:11 +00:00
|
|
|
p_sfix(ndo, &bp->root_delay);
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_TCHECK_SIZE(&bp->root_dispersion);
|
|
|
|
ND_PRINT(", Root dispersion: ");
|
2015-01-06 19:03:11 +00:00
|
|
|
p_sfix(ndo, &bp->root_dispersion);
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_TCHECK_4(bp->refid);
|
|
|
|
ND_PRINT(", Reference-ID: ");
|
1996-08-19 20:34:12 +00:00
|
|
|
/* Interpretation depends on stratum */
|
2023-05-10 15:02:34 +00:00
|
|
|
switch (stratum) {
|
1996-08-19 20:34:12 +00:00
|
|
|
|
|
|
|
case UNSPECIFIED:
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_PRINT("(unspec)");
|
1996-08-19 20:34:12 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
case PRIM_REF:
|
2023-05-10 15:02:34 +00:00
|
|
|
if (nd_printn(ndo, (const u_char *)&(bp->refid), 4, ndo->ndo_snapend))
|
2005-07-11 03:54:22 +00:00
|
|
|
goto trunc;
|
1996-08-19 20:34:12 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
case INFO_QUERY:
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_PRINT("%s INFO_QUERY", GET_IPADDR_STRING(bp->refid));
|
1996-08-19 20:34:12 +00:00
|
|
|
/* this doesn't have more content */
|
|
|
|
return;
|
|
|
|
|
|
|
|
case INFO_REPLY:
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_PRINT("%s INFO_REPLY", GET_IPADDR_STRING(bp->refid));
|
1996-08-19 20:34:12 +00:00
|
|
|
/* this is too complex to be worth printing */
|
|
|
|
return;
|
|
|
|
|
|
|
|
default:
|
2023-05-10 15:02:34 +00:00
|
|
|
/* In NTPv4 (RFC 5905) refid is an IPv4 address or first 32 bits of
|
|
|
|
MD5 sum of IPv6 address */
|
|
|
|
ND_PRINT("0x%08x", GET_BE_U_4(bp->refid));
|
1996-08-19 20:34:12 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_TCHECK_SIZE(&bp->ref_timestamp);
|
|
|
|
ND_PRINT("\n\t Reference Timestamp: ");
|
2015-01-06 19:03:11 +00:00
|
|
|
p_ntp_time(ndo, &(bp->ref_timestamp));
|
2005-05-29 18:17:16 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_TCHECK_SIZE(&bp->org_timestamp);
|
|
|
|
ND_PRINT("\n\t Originator Timestamp: ");
|
2015-01-06 19:03:11 +00:00
|
|
|
p_ntp_time(ndo, &(bp->org_timestamp));
|
2005-05-29 18:17:16 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_TCHECK_SIZE(&bp->rec_timestamp);
|
|
|
|
ND_PRINT("\n\t Receive Timestamp: ");
|
2015-01-06 19:03:11 +00:00
|
|
|
p_ntp_time(ndo, &(bp->rec_timestamp));
|
2005-05-29 18:17:16 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_TCHECK_SIZE(&bp->xmt_timestamp);
|
|
|
|
ND_PRINT("\n\t Transmit Timestamp: ");
|
2015-01-06 19:03:11 +00:00
|
|
|
p_ntp_time(ndo, &(bp->xmt_timestamp));
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_PRINT("\n\t Originator - Receive Timestamp: ");
|
2015-01-06 19:03:11 +00:00
|
|
|
p_ntp_delta(ndo, &(bp->org_timestamp), &(bp->rec_timestamp));
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_PRINT("\n\t Originator - Transmit Timestamp: ");
|
2015-01-06 19:03:11 +00:00
|
|
|
p_ntp_delta(ndo, &(bp->org_timestamp), &(bp->xmt_timestamp));
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
/* FIXME: this code is not aware of any extension fields */
|
|
|
|
if (length == NTP_TIMEMSG_MINLEN + 4) { /* Optional: key-id (crypto-NAK) */
|
|
|
|
ND_PRINT("\n\tKey id: %u", GET_BE_U_4(bp->key_id));
|
|
|
|
} else if (length == NTP_TIMEMSG_MINLEN + 4 + 16) { /* Optional: key-id + 128-bit digest */
|
|
|
|
ND_PRINT("\n\tKey id: %u", GET_BE_U_4(bp->key_id));
|
|
|
|
ND_TCHECK_LEN(bp->message_digest, 16);
|
|
|
|
ND_PRINT("\n\tAuthentication: %08x%08x%08x%08x",
|
|
|
|
GET_BE_U_4(bp->message_digest),
|
|
|
|
GET_BE_U_4(bp->message_digest + 4),
|
|
|
|
GET_BE_U_4(bp->message_digest + 8),
|
|
|
|
GET_BE_U_4(bp->message_digest + 12));
|
|
|
|
} else if (length == NTP_TIMEMSG_MINLEN + 4 + 20) { /* Optional: key-id + 160-bit digest */
|
|
|
|
ND_PRINT("\n\tKey id: %u", GET_BE_U_4(bp->key_id));
|
|
|
|
ND_TCHECK_LEN(bp->message_digest, 20);
|
|
|
|
ND_PRINT("\n\tAuthentication: %08x%08x%08x%08x%08x",
|
|
|
|
GET_BE_U_4(bp->message_digest),
|
|
|
|
GET_BE_U_4(bp->message_digest + 4),
|
|
|
|
GET_BE_U_4(bp->message_digest + 8),
|
|
|
|
GET_BE_U_4(bp->message_digest + 12),
|
|
|
|
GET_BE_U_4(bp->message_digest + 16));
|
|
|
|
} else if (length > NTP_TIMEMSG_MINLEN) {
|
|
|
|
ND_PRINT("\n\t(%u more bytes after the header)", length - NTP_TIMEMSG_MINLEN);
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
|
|
|
|
invalid:
|
|
|
|
nd_print_invalid(ndo);
|
|
|
|
ND_TCHECK_LEN(bp, length);
|
1996-08-19 20:34:12 +00:00
|
|
|
return;
|
|
|
|
|
|
|
|
trunc:
|
2023-05-10 15:02:34 +00:00
|
|
|
nd_print_trunc(ndo);
|
1996-08-19 20:34:12 +00:00
|
|
|
}
|
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
/*
|
|
|
|
* Print NTP control message requests and responses
|
|
|
|
*/
|
1996-08-19 20:34:12 +00:00
|
|
|
static void
|
2023-05-10 15:02:34 +00:00
|
|
|
ntp_control_print(netdissect_options *ndo,
|
|
|
|
const struct ntp_control_data *cd, u_int length)
|
1996-08-19 20:34:12 +00:00
|
|
|
{
|
2023-05-10 15:02:34 +00:00
|
|
|
uint8_t control, R, E, M, opcode;
|
|
|
|
uint16_t sequence, status, assoc, offset, count;
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
if (length < NTP_CTRLMSG_MINLEN)
|
|
|
|
goto invalid;
|
|
|
|
|
|
|
|
control = GET_U_1(cd->control);
|
|
|
|
R = (control & 0x80) != 0;
|
|
|
|
E = (control & 0x40) != 0;
|
|
|
|
M = (control & 0x20) != 0;
|
|
|
|
opcode = control & 0x1f;
|
|
|
|
ND_PRINT(", %s, %s, %s, OpCode=%u\n",
|
|
|
|
R ? "Response" : "Request", E ? "Error" : "OK",
|
|
|
|
M ? "More" : "Last", opcode);
|
|
|
|
|
|
|
|
sequence = GET_BE_U_2(cd->sequence);
|
|
|
|
ND_PRINT("\tSequence=%hu", sequence);
|
|
|
|
|
|
|
|
status = GET_BE_U_2(cd->status);
|
|
|
|
ND_PRINT(", Status=%#hx", status);
|
|
|
|
|
|
|
|
assoc = GET_BE_U_2(cd->assoc);
|
|
|
|
ND_PRINT(", Assoc.=%hu", assoc);
|
|
|
|
|
|
|
|
offset = GET_BE_U_2(cd->offset);
|
|
|
|
ND_PRINT(", Offset=%hu", offset);
|
|
|
|
|
|
|
|
count = GET_BE_U_2(cd->count);
|
|
|
|
ND_PRINT(", Count=%hu", count);
|
|
|
|
|
|
|
|
if (NTP_CTRLMSG_MINLEN + count > length)
|
|
|
|
goto invalid;
|
|
|
|
if (count != 0) {
|
|
|
|
ND_TCHECK_LEN(cd->data, count);
|
|
|
|
ND_PRINT("\n\tTO-BE-DONE: data not interpreted");
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
|
|
|
|
invalid:
|
|
|
|
nd_print_invalid(ndo);
|
|
|
|
ND_TCHECK_LEN(cd, length);
|
|
|
|
return;
|
|
|
|
|
|
|
|
trunc:
|
|
|
|
nd_print_trunc(ndo);
|
1996-08-19 20:34:12 +00:00
|
|
|
}
|
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
union ntpdata {
|
|
|
|
struct ntp_time_data td;
|
|
|
|
struct ntp_control_data cd;
|
|
|
|
};
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
/*
|
|
|
|
* Print NTP requests, handling the common VN, LI, and Mode
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
ntp_print(netdissect_options *ndo,
|
|
|
|
const u_char *cp, u_int length)
|
1996-08-19 20:34:12 +00:00
|
|
|
{
|
2023-05-10 15:02:34 +00:00
|
|
|
const union ntpdata *bp = (const union ntpdata *)cp;
|
|
|
|
u_int mode, version, leapind;
|
|
|
|
uint8_t status;
|
|
|
|
|
|
|
|
ndo->ndo_protocol = "ntp";
|
|
|
|
status = GET_U_1(bp->td.status);
|
|
|
|
|
|
|
|
version = (status & VERSIONMASK) >> VERSIONSHIFT;
|
|
|
|
ND_PRINT("NTPv%u", version);
|
|
|
|
|
|
|
|
mode = (status & MODEMASK) >> MODESHIFT;
|
|
|
|
if (!ndo->ndo_vflag) {
|
|
|
|
ND_PRINT(", %s, length %u",
|
|
|
|
tok2str(ntp_mode_values, "Unknown mode", mode),
|
|
|
|
length);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
ND_PRINT(", %s, length %u\n",
|
|
|
|
tok2str(ntp_mode_values, "Unknown mode", mode), length);
|
|
|
|
|
|
|
|
/* leapind = (status & LEAPMASK) >> LEAPSHIFT; */
|
|
|
|
leapind = (status & LEAPMASK);
|
|
|
|
ND_PRINT("\tLeap indicator: %s (%u)",
|
|
|
|
tok2str(ntp_leapind_values, "Unknown", leapind),
|
|
|
|
leapind);
|
|
|
|
|
|
|
|
switch (mode) {
|
|
|
|
|
|
|
|
case MODE_UNSPEC:
|
|
|
|
case MODE_SYM_ACT:
|
|
|
|
case MODE_SYM_PAS:
|
|
|
|
case MODE_CLIENT:
|
|
|
|
case MODE_SERVER:
|
|
|
|
case MODE_BROADCAST:
|
|
|
|
ntp_time_print(ndo, &bp->td, length);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case MODE_CONTROL:
|
|
|
|
ntp_control_print(ndo, &bp->cd, length);
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
break; /* XXX: not implemented! */
|
2004-03-31 09:17:26 +00:00
|
|
|
}
|
2023-05-10 15:02:34 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
p_sfix(netdissect_options *ndo,
|
|
|
|
const struct s_fixedpt *sfp)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
int f;
|
|
|
|
double ff;
|
|
|
|
|
|
|
|
i = GET_BE_U_2(sfp->int_part);
|
|
|
|
f = GET_BE_U_2(sfp->fraction);
|
|
|
|
ff = f / 65536.0; /* shift radix point by 16 bits */
|
|
|
|
f = (int)(ff * 1000000.0); /* Treat fraction as parts per million */
|
|
|
|
ND_PRINT("%d.%06d", i, f);
|
1996-08-19 20:34:12 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Prints time difference between *lfp and *olfp */
|
|
|
|
static void
|
2015-01-06 19:03:11 +00:00
|
|
|
p_ntp_delta(netdissect_options *ndo,
|
2023-05-10 15:02:34 +00:00
|
|
|
const struct l_fixedpt *olfp,
|
|
|
|
const struct l_fixedpt *lfp)
|
1996-08-19 20:34:12 +00:00
|
|
|
{
|
2023-05-10 15:02:34 +00:00
|
|
|
uint32_t u, uf;
|
|
|
|
uint32_t ou, ouf;
|
|
|
|
uint32_t i;
|
|
|
|
uint32_t f;
|
|
|
|
double ff;
|
1996-08-19 20:34:12 +00:00
|
|
|
int signbit;
|
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
u = GET_BE_U_4(lfp->int_part);
|
|
|
|
ou = GET_BE_U_4(olfp->int_part);
|
|
|
|
uf = GET_BE_U_4(lfp->fraction);
|
|
|
|
ouf = GET_BE_U_4(olfp->fraction);
|
2004-03-31 09:17:26 +00:00
|
|
|
if (ou == 0 && ouf == 0) {
|
2015-01-06 19:03:11 +00:00
|
|
|
p_ntp_time(ndo, lfp);
|
2004-03-31 09:17:26 +00:00
|
|
|
return;
|
|
|
|
}
|
1996-08-19 20:34:12 +00:00
|
|
|
|
2023-05-10 15:02:34 +00:00
|
|
|
if (u > ou) { /* new is definitely greater than old */
|
1996-08-19 20:34:12 +00:00
|
|
|
signbit = 0;
|
2023-05-10 15:02:34 +00:00
|
|
|
i = u - ou;
|
1996-08-19 20:34:12 +00:00
|
|
|
f = uf - ouf;
|
|
|
|
if (ouf > uf) /* must borrow from high-order bits */
|
|
|
|
i -= 1;
|
2023-05-10 15:02:34 +00:00
|
|
|
} else if (u < ou) { /* new is definitely less than old */
|
1996-08-19 20:34:12 +00:00
|
|
|
signbit = 1;
|
2023-05-10 15:02:34 +00:00
|
|
|
i = ou - u;
|
1996-08-19 20:34:12 +00:00
|
|
|
f = ouf - uf;
|
2023-05-10 15:02:34 +00:00
|
|
|
if (uf > ouf) /* must borrow from the high-order bits */
|
|
|
|
i -= 1;
|
1996-08-19 20:34:12 +00:00
|
|
|
} else { /* int_part is zero */
|
2023-05-10 15:02:34 +00:00
|
|
|
i = 0;
|
1996-08-19 20:34:12 +00:00
|
|
|
if (uf > ouf) {
|
|
|
|
signbit = 0;
|
|
|
|
f = uf - ouf;
|
|
|
|
} else {
|
|
|
|
signbit = 1;
|
|
|
|
f = ouf - uf;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
ff = f;
|
|
|
|
if (ff < 0.0) /* some compilers are buggy */
|
|
|
|
ff += FMAXINT;
|
2017-01-31 19:17:06 +00:00
|
|
|
ff = ff / FMAXINT; /* shift radix point by 32 bits */
|
|
|
|
f = (uint32_t)(ff * 1000000000.0); /* treat fraction as parts per billion */
|
2023-05-10 15:02:34 +00:00
|
|
|
ND_PRINT("%s%u.%09u", signbit ? "-" : "+", i, f);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Prints polling interval in log2 as seconds or fraction of second */
|
|
|
|
static void
|
|
|
|
p_poll(netdissect_options *ndo,
|
|
|
|
const int poll_interval)
|
|
|
|
{
|
|
|
|
if (poll_interval <= -32 || poll_interval >= 32)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (poll_interval >= 0)
|
|
|
|
ND_PRINT(" (%us)", 1U << poll_interval);
|
|
|
|
else
|
|
|
|
ND_PRINT(" (1/%us)", 1U << -poll_interval);
|
1996-08-19 20:34:12 +00:00
|
|
|
}
|
2004-03-31 09:17:26 +00:00
|
|
|
|