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tcpdump/print-ntp.c
hannes cfd61cde4d from Carles Kishimoto <carles.kishimoto@gmail.com>: 
print the md5 digest for signed NTP packets as well as the key-id
2007-11-30 13:45:10 +00:00

306 lines
8.1 KiB
C
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/*
* 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.
*
* Format and print ntp packets.
* By Jeffrey Mogul/DECWRL
* loosely based on print-bootp.c
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-ntp.c,v 1.43 2007-11-30 13:45:10 hannes Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_STRFTIME
#include <time.h>
#endif
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
#ifdef MODEMASK
#undef MODEMASK /* Solaris sucks */
#endif
#include "ntp.h"
static void p_sfix(const struct s_fixedpt *);
static void p_ntp_time(const struct l_fixedpt *);
static void p_ntp_delta(const struct l_fixedpt *, const struct l_fixedpt *);
static 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 struct tok ntp_leapind_values[] = {
{ NO_WARNING, "" },
{ PLUS_SEC, "+1s" },
{ MINUS_SEC, "-1s" },
{ ALARM, "clock unsynchronized" },
{ 0, NULL }
};
static struct tok ntp_stratum_values[] = {
{ UNSPECIFIED, "unspecified" },
{ PRIM_REF, "primary reference" },
{ 0, NULL }
};
/*
* Print ntp requests
*/
void
ntp_print(register const u_char *cp, u_int length)
{
register const struct ntpdata *bp;
int mode, version, leapind;
bp = (struct ntpdata *)cp;
TCHECK(bp->status);
version = (int)(bp->status & VERSIONMASK) >> 3;
printf("NTPv%d", version);
mode = bp->status & MODEMASK;
if (!vflag) {
printf (", %s, length %u",
tok2str(ntp_mode_values, "Unknown mode", mode),
length);
return;
}
printf (", length %u\n\t%s",
length,
tok2str(ntp_mode_values, "Unknown mode", mode));
leapind = bp->status & LEAPMASK;
printf (", Leap indicator: %s (%u)",
tok2str(ntp_leapind_values, "Unknown", leapind),
leapind);
TCHECK(bp->stratum);
printf(", Stratum %u (%s)",
bp->stratum,
tok2str(ntp_stratum_values, (bp->stratum >=2 && bp->stratum<=15) ? "secondary reference" : "reserved", bp->stratum));
TCHECK(bp->ppoll);
printf(", poll %us", bp->ppoll);
/* Can't TCHECK bp->precision bitfield so bp->distance + 0 instead */
TCHECK2(bp->root_delay, 0);
printf(", precision %d", bp->precision);
TCHECK(bp->root_delay);
fputs("\n\tRoot Delay: ", stdout);
p_sfix(&bp->root_delay);
TCHECK(bp->root_dispersion);
fputs(", Root dispersion: ", stdout);
p_sfix(&bp->root_dispersion);
TCHECK(bp->refid);
fputs(", Reference-ID: ", stdout);
/* Interpretation depends on stratum */
switch (bp->stratum) {
case UNSPECIFIED:
printf("(unspec)");
break;
case PRIM_REF:
if (fn_printn((u_char *)&(bp->refid), 4, snapend))
goto trunc;
break;
case INFO_QUERY:
printf("%s INFO_QUERY", ipaddr_string(&(bp->refid)));
/* this doesn't have more content */
return;
case INFO_REPLY:
printf("%s INFO_REPLY", ipaddr_string(&(bp->refid)));
/* this is too complex to be worth printing */
return;
default:
printf("%s", ipaddr_string(&(bp->refid)));
break;
}
TCHECK(bp->ref_timestamp);
fputs("\n\t Reference Timestamp: ", stdout);
p_ntp_time(&(bp->ref_timestamp));
TCHECK(bp->org_timestamp);
fputs("\n\t Originator Timestamp: ", stdout);
p_ntp_time(&(bp->org_timestamp));
TCHECK(bp->rec_timestamp);
fputs("\n\t Receive Timestamp: ", stdout);
p_ntp_time(&(bp->rec_timestamp));
TCHECK(bp->xmt_timestamp);
fputs("\n\t Transmit Timestamp: ", stdout);
p_ntp_time(&(bp->xmt_timestamp));
fputs("\n\t Originator - Receive Timestamp: ", stdout);
p_ntp_delta(&(bp->org_timestamp), &(bp->rec_timestamp));
fputs("\n\t Originator - Transmit Timestamp: ", stdout);
p_ntp_delta(&(bp->org_timestamp), &(bp->xmt_timestamp));
if ( (sizeof(struct ntpdata) - length) == 16) { /* Optional: key-id */
printf("\n\tKey id: %u", bp->key_id);
} else if ( (sizeof(struct ntpdata) - length) == 0) { /* Optional: key-id + authentication */
printf("\n\tKey id: %u", bp->key_id);
printf("\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:
fputs(" [|ntp]", stdout);
}
static void
p_sfix(register const struct s_fixedpt *sfp)
{
register int i;
register int f;
register float ff;
i = EXTRACT_16BITS(&sfp->int_part);
f = EXTRACT_16BITS(&sfp->fraction);
ff = f / 65536.0; /* shift radix point by 16 bits */
f = ff * 1000000.0; /* Treat fraction as parts per million */
printf("%d.%06d", i, f);
}
#define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */
static void
p_ntp_time(register const struct l_fixedpt *lfp)
{
register int32_t i;
register u_int32_t uf;
register u_int32_t f;
register float 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 = ff * 1000000000.0; /* treat fraction as parts per billion */
printf("%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);
printf (" (%s)", time_buf);
}
#endif
}
/* Prints time difference between *lfp and *olfp */
static void
p_ntp_delta(register const struct l_fixedpt *olfp,
register const struct l_fixedpt *lfp)
{
register int32_t i;
register u_int32_t u, uf;
register u_int32_t ou, ouf;
register u_int32_t f;
register float 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(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 = ff * 1000000000.0; /* treat fraction as parts per billion */
if (signbit)
putchar('-');
else
putchar('+');
printf("%d.%09d", i, f);
}
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