mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-24 02:23:27 +08:00
d729c670fc
In NTPv4 (RFC 5905) the refid field for stratum > 1 is an IPv4 address or first 32 bits of MD5 sum of an IPv6 address. It's not possible to tell which of the two it actually is. Print the field as a hexadecimal number in order to not confuse refids generated from IPv6 addresses with IPv4 addresses.
447 lines
14 KiB
C
447 lines
14 KiB
C
/*
|
|
* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that: (1) source code distributions
|
|
* retain the above copyright notice and this paragraph in its entirety, (2)
|
|
* distributions including binary code include the above copyright notice and
|
|
* this paragraph in its entirety in the documentation or other materials
|
|
* provided with the distribution, and (3) all advertising materials mentioning
|
|
* features or use of this software display the following acknowledgement:
|
|
* ``This product includes software developed by the University of California,
|
|
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
|
|
* the University nor the names of its contributors may be used to endorse
|
|
* or promote products derived from this software without specific prior
|
|
* written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*
|
|
* By Jeffrey Mogul/DECWRL
|
|
* loosely based on print-bootp.c
|
|
*/
|
|
|
|
/* \summary: Network Time Protocol (NTP) printer */
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <netdissect-stdinc.h>
|
|
|
|
#ifdef HAVE_STRFTIME
|
|
#include <time.h>
|
|
#endif
|
|
|
|
#include "netdissect.h"
|
|
#include "addrtoname.h"
|
|
#include "extract.h"
|
|
|
|
/*
|
|
* Based on ntp.h from the U of MD implementation
|
|
* This file is based on Version 2 of the NTP spec (RFC1119).
|
|
*/
|
|
|
|
/*
|
|
* Definitions for the masses
|
|
*/
|
|
#define JAN_1970 2208988800U /* 1970 - 1900 in seconds */
|
|
|
|
/*
|
|
* Structure definitions for NTP fixed point values
|
|
*
|
|
* 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
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | Integer Part |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | Fraction Part |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*
|
|
* 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
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | Integer Part | Fraction Part |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*/
|
|
struct l_fixedpt {
|
|
uint32_t int_part;
|
|
uint32_t fraction;
|
|
};
|
|
|
|
struct s_fixedpt {
|
|
uint16_t int_part;
|
|
uint16_t fraction;
|
|
};
|
|
|
|
/* 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) |
|
|
* | |
|
|
* | |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*/
|
|
|
|
struct ntpdata {
|
|
u_char status; /* status of local clock and leap info */
|
|
u_char stratum; /* Stratum level */
|
|
int ppoll:8; /* poll value */
|
|
int precision:8;
|
|
struct s_fixedpt root_delay;
|
|
struct s_fixedpt root_dispersion;
|
|
uint32_t refid;
|
|
struct l_fixedpt ref_timestamp;
|
|
struct l_fixedpt org_timestamp;
|
|
struct l_fixedpt rec_timestamp;
|
|
struct l_fixedpt xmt_timestamp;
|
|
uint32_t key_id;
|
|
uint8_t message_digest[16];
|
|
};
|
|
/*
|
|
* 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
|
|
#define LEAPMASK 0xc0
|
|
#ifdef MODEMASK
|
|
#undef MODEMASK /* Solaris sucks */
|
|
#endif
|
|
#define MODEMASK 0x07
|
|
|
|
/*
|
|
* 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 */
|
|
#define MODE_RES1 6 /* reserved */
|
|
#define MODE_RES2 7 /* reserved */
|
|
|
|
/*
|
|
* 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_time(netdissect_options *, const struct l_fixedpt *);
|
|
static void p_ntp_delta(netdissect_options *, const struct l_fixedpt *, const struct l_fixedpt *);
|
|
static void p_poll(netdissect_options *, register const int);
|
|
|
|
static const struct tok ntp_mode_values[] = {
|
|
{ MODE_UNSPEC, "unspecified" },
|
|
{ MODE_SYM_ACT, "symmetric active" },
|
|
{ MODE_SYM_PAS, "symmetric passive" },
|
|
{ MODE_CLIENT, "Client" },
|
|
{ MODE_SERVER, "Server" },
|
|
{ MODE_BROADCAST, "Broadcast" },
|
|
{ MODE_RES1, "Reserved" },
|
|
{ MODE_RES2, "Reserved" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const struct tok ntp_leapind_values[] = {
|
|
{ NO_WARNING, "" },
|
|
{ PLUS_SEC, "+1s" },
|
|
{ MINUS_SEC, "-1s" },
|
|
{ ALARM, "clock unsynchronized" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const struct tok ntp_stratum_values[] = {
|
|
{ UNSPECIFIED, "unspecified" },
|
|
{ PRIM_REF, "primary reference" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
/*
|
|
* Print ntp requests
|
|
*/
|
|
void
|
|
ntp_print(netdissect_options *ndo,
|
|
register const u_char *cp, u_int length)
|
|
{
|
|
register const struct ntpdata *bp;
|
|
int mode, version, leapind;
|
|
|
|
bp = (const struct ntpdata *)cp;
|
|
|
|
ND_TCHECK(bp->status);
|
|
|
|
version = (int)(bp->status & VERSIONMASK) >> 3;
|
|
ND_PRINT((ndo, "NTPv%d", version));
|
|
|
|
mode = bp->status & MODEMASK;
|
|
if (!ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, ", %s, length %u",
|
|
tok2str(ntp_mode_values, "Unknown mode", mode),
|
|
length));
|
|
return;
|
|
}
|
|
|
|
ND_PRINT((ndo, ", length %u\n\t%s",
|
|
length,
|
|
tok2str(ntp_mode_values, "Unknown mode", mode)));
|
|
|
|
leapind = bp->status & LEAPMASK;
|
|
ND_PRINT((ndo, ", Leap indicator: %s (%u)",
|
|
tok2str(ntp_leapind_values, "Unknown", leapind),
|
|
leapind));
|
|
|
|
ND_TCHECK(bp->stratum);
|
|
ND_PRINT((ndo, ", Stratum %u (%s)",
|
|
bp->stratum,
|
|
tok2str(ntp_stratum_values, (bp->stratum >=2 && bp->stratum<=15) ? "secondary reference" : "reserved", bp->stratum)));
|
|
|
|
/* Can't ND_TCHECK bp->ppoll bitfield so bp->stratum + 2 instead */
|
|
ND_TCHECK2(bp->stratum, 2);
|
|
ND_PRINT((ndo, ", poll %d", bp->ppoll));
|
|
p_poll(ndo, bp->ppoll);
|
|
|
|
/* Can't ND_TCHECK bp->precision bitfield so bp->distance + 0 instead */
|
|
ND_TCHECK2(bp->root_delay, 0);
|
|
ND_PRINT((ndo, ", precision %d", bp->precision));
|
|
|
|
ND_TCHECK(bp->root_delay);
|
|
ND_PRINT((ndo, "\n\tRoot Delay: "));
|
|
p_sfix(ndo, &bp->root_delay);
|
|
|
|
ND_TCHECK(bp->root_dispersion);
|
|
ND_PRINT((ndo, ", Root dispersion: "));
|
|
p_sfix(ndo, &bp->root_dispersion);
|
|
|
|
ND_TCHECK(bp->refid);
|
|
ND_PRINT((ndo, ", Reference-ID: "));
|
|
/* Interpretation depends on stratum */
|
|
switch (bp->stratum) {
|
|
|
|
case UNSPECIFIED:
|
|
ND_PRINT((ndo, "(unspec)"));
|
|
break;
|
|
|
|
case PRIM_REF:
|
|
if (fn_printn(ndo, (const u_char *)&(bp->refid), 4, ndo->ndo_snapend))
|
|
goto trunc;
|
|
break;
|
|
|
|
case INFO_QUERY:
|
|
ND_PRINT((ndo, "%s INFO_QUERY", ipaddr_string(ndo, &(bp->refid))));
|
|
/* this doesn't have more content */
|
|
return;
|
|
|
|
case INFO_REPLY:
|
|
ND_PRINT((ndo, "%s INFO_REPLY", ipaddr_string(ndo, &(bp->refid))));
|
|
/* this is too complex to be worth printing */
|
|
return;
|
|
|
|
default:
|
|
/* In NTPv4 (RFC 5905) refid is an IPv4 address or first 32 bits of
|
|
MD5 sum of IPv6 address */
|
|
ND_PRINT((ndo, "%08x", EXTRACT_32BITS(&bp->refid)));
|
|
break;
|
|
}
|
|
|
|
ND_TCHECK(bp->ref_timestamp);
|
|
ND_PRINT((ndo, "\n\t Reference Timestamp: "));
|
|
p_ntp_time(ndo, &(bp->ref_timestamp));
|
|
|
|
ND_TCHECK(bp->org_timestamp);
|
|
ND_PRINT((ndo, "\n\t Originator Timestamp: "));
|
|
p_ntp_time(ndo, &(bp->org_timestamp));
|
|
|
|
ND_TCHECK(bp->rec_timestamp);
|
|
ND_PRINT((ndo, "\n\t Receive Timestamp: "));
|
|
p_ntp_time(ndo, &(bp->rec_timestamp));
|
|
|
|
ND_TCHECK(bp->xmt_timestamp);
|
|
ND_PRINT((ndo, "\n\t Transmit Timestamp: "));
|
|
p_ntp_time(ndo, &(bp->xmt_timestamp));
|
|
|
|
ND_PRINT((ndo, "\n\t Originator - Receive Timestamp: "));
|
|
p_ntp_delta(ndo, &(bp->org_timestamp), &(bp->rec_timestamp));
|
|
|
|
ND_PRINT((ndo, "\n\t Originator - Transmit Timestamp: "));
|
|
p_ntp_delta(ndo, &(bp->org_timestamp), &(bp->xmt_timestamp));
|
|
|
|
if ( (sizeof(struct ntpdata) - length) == 16) { /* Optional: key-id */
|
|
ND_TCHECK(bp->key_id);
|
|
ND_PRINT((ndo, "\n\tKey id: %u", bp->key_id));
|
|
} else if ( (sizeof(struct ntpdata) - length) == 0) { /* Optional: key-id + authentication */
|
|
ND_TCHECK(bp->key_id);
|
|
ND_PRINT((ndo, "\n\tKey id: %u", bp->key_id));
|
|
ND_TCHECK2(bp->message_digest, sizeof (bp->message_digest));
|
|
ND_PRINT((ndo, "\n\tAuthentication: %08x%08x%08x%08x",
|
|
EXTRACT_32BITS(bp->message_digest),
|
|
EXTRACT_32BITS(bp->message_digest + 4),
|
|
EXTRACT_32BITS(bp->message_digest + 8),
|
|
EXTRACT_32BITS(bp->message_digest + 12)));
|
|
}
|
|
return;
|
|
|
|
trunc:
|
|
ND_PRINT((ndo, " [|ntp]"));
|
|
}
|
|
|
|
static void
|
|
p_sfix(netdissect_options *ndo,
|
|
register const struct s_fixedpt *sfp)
|
|
{
|
|
register int i;
|
|
register int f;
|
|
register double ff;
|
|
|
|
i = EXTRACT_16BITS(&sfp->int_part);
|
|
f = EXTRACT_16BITS(&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((ndo, "%d.%06d", i, f));
|
|
}
|
|
|
|
#define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */
|
|
|
|
static void
|
|
p_ntp_time(netdissect_options *ndo,
|
|
register const struct l_fixedpt *lfp)
|
|
{
|
|
register int32_t i;
|
|
register uint32_t uf;
|
|
register uint32_t f;
|
|
register double ff;
|
|
|
|
i = EXTRACT_32BITS(&lfp->int_part);
|
|
uf = EXTRACT_32BITS(&lfp->fraction);
|
|
ff = uf;
|
|
if (ff < 0.0) /* some compilers are buggy */
|
|
ff += FMAXINT;
|
|
ff = ff / FMAXINT; /* shift radix point by 32 bits */
|
|
f = (uint32_t)(ff * 1000000000.0); /* treat fraction as parts per billion */
|
|
ND_PRINT((ndo, "%u.%09d", i, f));
|
|
|
|
#ifdef HAVE_STRFTIME
|
|
/*
|
|
* print the time in human-readable format.
|
|
*/
|
|
if (i) {
|
|
time_t seconds = i - JAN_1970;
|
|
struct tm *tm;
|
|
char time_buf[128];
|
|
|
|
tm = localtime(&seconds);
|
|
strftime(time_buf, sizeof (time_buf), "%Y/%m/%d %H:%M:%S", tm);
|
|
ND_PRINT((ndo, " (%s)", time_buf));
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* Prints time difference between *lfp and *olfp */
|
|
static void
|
|
p_ntp_delta(netdissect_options *ndo,
|
|
register const struct l_fixedpt *olfp,
|
|
register const struct l_fixedpt *lfp)
|
|
{
|
|
register int32_t i;
|
|
register uint32_t u, uf;
|
|
register uint32_t ou, ouf;
|
|
register uint32_t f;
|
|
register double ff;
|
|
int signbit;
|
|
|
|
u = EXTRACT_32BITS(&lfp->int_part);
|
|
ou = EXTRACT_32BITS(&olfp->int_part);
|
|
uf = EXTRACT_32BITS(&lfp->fraction);
|
|
ouf = EXTRACT_32BITS(&olfp->fraction);
|
|
if (ou == 0 && ouf == 0) {
|
|
p_ntp_time(ndo, lfp);
|
|
return;
|
|
}
|
|
|
|
i = u - ou;
|
|
|
|
if (i > 0) { /* new is definitely greater than old */
|
|
signbit = 0;
|
|
f = uf - ouf;
|
|
if (ouf > uf) /* must borrow from high-order bits */
|
|
i -= 1;
|
|
} else if (i < 0) { /* new is definitely less than old */
|
|
signbit = 1;
|
|
f = ouf - uf;
|
|
if (uf > ouf) /* must carry into the high-order bits */
|
|
i += 1;
|
|
i = -i;
|
|
} else { /* int_part is zero */
|
|
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;
|
|
ff = ff / FMAXINT; /* shift radix point by 32 bits */
|
|
f = (uint32_t)(ff * 1000000000.0); /* treat fraction as parts per billion */
|
|
ND_PRINT((ndo, "%s%d.%09d", signbit ? "-" : "+", i, f));
|
|
}
|
|
|
|
/* Prints polling interval in log2 as seconds or fraction of second */
|
|
static void
|
|
p_poll(netdissect_options *ndo,
|
|
register const int poll)
|
|
{
|
|
if (poll <= -32 || poll >= 32)
|
|
return;
|
|
|
|
if (poll >= 0)
|
|
ND_PRINT((ndo, " (%us)", 1U << poll));
|
|
else
|
|
ND_PRINT((ndo, " (1/%us)", 1U << -poll));
|
|
}
|
|
|