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/* $OpenBSD: print-ntp.c,v 1.4 1996/07/13 11:01:26 mickey Exp $ */
/*
* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996
* 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 char rcsid[] =
"@(#) Header: print-ntp.c,v 1.20 96/06/23 02:11:46 leres Exp (LBL)";
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#if __STDC__
struct mbuf;
struct rtentry;
#endif
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#undef MODEMASK /* Solaris sucks */
#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, int length)
{
register const struct ntpdata *bp;
register const u_char *ep;
int mode, version, leapind;
static char rclock[5];
#define TCHECK(var, l) if ((u_char *)&(var) > ep - l) goto trunc
bp = (struct ntpdata *)cp;
/* Note funny sized packets */
if (length != sizeof(struct ntpdata))
(void)printf(" [len=%d]", length);
/* 'ep' points to the end of available data. */
ep = snapend;
TCHECK(bp->status, sizeof(bp->status));
version = (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, sizeof(bp->stratum));
printf(" strat %d", bp->stratum);
TCHECK(bp->ppoll, sizeof(bp->ppoll));
printf(" poll %d", bp->ppoll);
/* Can't TCHECK bp->precision bitfield so bp->distance + 0 instead */
TCHECK(bp->distance, 0);
printf(" prec %d", bp->precision);
if (!vflag)
return;
TCHECK(bp->distance, sizeof(bp->distance));
fputs(" dist ", stdout);
p_sfix(&bp->distance);
TCHECK(bp->dispersion, sizeof(bp->dispersion));
fputs(" disp ", stdout);
p_sfix(&bp->dispersion);
TCHECK(bp->refid, sizeof(bp->refid));
fputs(" ref ", stdout);
/* Interpretation depends on stratum */
switch (bp->stratum) {
case UNSPECIFIED:
printf("(unspec)");
break;
case PRIM_REF:
strncpy(rclock, (char *)&(bp->refid), 4);
rclock[4] = '\0';
fputs(rclock, stdout);
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, sizeof(bp->reftime));
putchar('@');
p_ntp_time(&(bp->reftime));
TCHECK(bp->org, sizeof(bp->org));
fputs(" orig ", stdout);
p_ntp_time(&(bp->org));
TCHECK(bp->rec, sizeof(bp->rec));
fputs(" rec ", stdout);
p_ntp_delta(&(bp->org), &(bp->rec));
TCHECK(bp->xmt, sizeof(bp->xmt));
fputs(" xmt ", stdout);
p_ntp_delta(&(bp->org), &(bp->xmt));
return;
trunc:
fputs(" [|ntp]", stdout);
#undef TCHECK
}
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);
}
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