283 lines
6.3 KiB
C
283 lines
6.3 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.
|
|
*
|
|
* Format and print ntp packets.
|
|
* By Jeffrey Mogul/DECWRL
|
|
* loosely based on print-bootp.c
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] =
|
|
"@(#) $Header: /tcpdump/master/tcpdump/print-ntp.c,v 1.32 2001/08/20 15:36:57 fenner Exp $ (LBL)";
|
|
#endif
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <ctype.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "interface.h"
|
|
#include "addrtoname.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 *);
|
|
|
|
/*
|
|
* 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;
|
|
/* Note funny sized packets */
|
|
if (length != sizeof(struct ntpdata))
|
|
(void)printf(" [len=%d]", length);
|
|
|
|
TCHECK(bp->status);
|
|
|
|
version = (int)(bp->status & VERSIONMASK) >> 3;
|
|
printf(" v%d", version);
|
|
|
|
leapind = bp->status & LEAPMASK;
|
|
switch (leapind) {
|
|
|
|
case NO_WARNING:
|
|
break;
|
|
|
|
case PLUS_SEC:
|
|
fputs(" +1s", stdout);
|
|
break;
|
|
|
|
case MINUS_SEC:
|
|
fputs(" -1s", stdout);
|
|
break;
|
|
}
|
|
|
|
mode = bp->status & MODEMASK;
|
|
switch (mode) {
|
|
|
|
case MODE_UNSPEC: /* unspecified */
|
|
fputs(" unspec", stdout);
|
|
break;
|
|
|
|
case MODE_SYM_ACT: /* symmetric active */
|
|
fputs(" sym_act", stdout);
|
|
break;
|
|
|
|
case MODE_SYM_PAS: /* symmetric passive */
|
|
fputs(" sym_pas", stdout);
|
|
break;
|
|
|
|
case MODE_CLIENT: /* client */
|
|
fputs(" client", stdout);
|
|
break;
|
|
|
|
case MODE_SERVER: /* server */
|
|
fputs(" server", stdout);
|
|
break;
|
|
|
|
case MODE_BROADCAST: /* broadcast */
|
|
fputs(" bcast", stdout);
|
|
break;
|
|
|
|
case MODE_RES1: /* reserved */
|
|
fputs(" res1", stdout);
|
|
break;
|
|
|
|
case MODE_RES2: /* reserved */
|
|
fputs(" res2", stdout);
|
|
break;
|
|
|
|
}
|
|
|
|
TCHECK(bp->stratum);
|
|
printf(" strat %d", bp->stratum);
|
|
|
|
TCHECK(bp->ppoll);
|
|
printf(" poll %d", bp->ppoll);
|
|
|
|
/* Can't TCHECK bp->precision bitfield so bp->distance + 0 instead */
|
|
TCHECK2(bp->distance, 0);
|
|
printf(" prec %d", bp->precision);
|
|
|
|
if (!vflag)
|
|
return;
|
|
|
|
TCHECK(bp->distance);
|
|
fputs(" dist ", stdout);
|
|
p_sfix(&bp->distance);
|
|
|
|
TCHECK(bp->dispersion);
|
|
fputs(" disp ", stdout);
|
|
p_sfix(&bp->dispersion);
|
|
|
|
TCHECK(bp->refid);
|
|
fputs(" ref ", stdout);
|
|
/* Interpretation depends on stratum */
|
|
switch (bp->stratum) {
|
|
|
|
case UNSPECIFIED:
|
|
printf("(unspec)");
|
|
break;
|
|
|
|
case PRIM_REF:
|
|
fn_printn((char *)&(bp->refid), 4, NULL);
|
|
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->reftime);
|
|
putchar('@');
|
|
p_ntp_time(&(bp->reftime));
|
|
|
|
TCHECK(bp->org);
|
|
fputs(" orig ", stdout);
|
|
p_ntp_time(&(bp->org));
|
|
|
|
TCHECK(bp->rec);
|
|
fputs(" rec ", stdout);
|
|
p_ntp_delta(&(bp->org), &(bp->rec));
|
|
|
|
TCHECK(bp->xmt);
|
|
fputs(" xmt ", stdout);
|
|
p_ntp_delta(&(bp->org), &(bp->xmt));
|
|
|
|
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 = ntohs(sfp->int_part);
|
|
f = ntohs(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 = ntohl(lfp->int_part);
|
|
uf = ntohl(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);
|
|
}
|
|
|
|
/* 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 uf;
|
|
register u_int32_t ouf;
|
|
register u_int32_t f;
|
|
register float ff;
|
|
int signbit;
|
|
|
|
i = ntohl(lfp->int_part) - ntohl(olfp->int_part);
|
|
|
|
uf = ntohl(lfp->fraction);
|
|
ouf = ntohl(olfp->fraction);
|
|
|
|
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);
|
|
}
|