281 lines
6.3 KiB
C
281 lines
6.3 KiB
C
/*
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* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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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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* 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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* Format and print ntp packets.
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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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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-ntp.c,v 1.32.4.1 2002/07/10 07:13:37 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#ifdef MODEMASK
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#undef MODEMASK /* Solaris sucks */
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#endif
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#include "ntp.h"
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static void p_sfix(const struct s_fixedpt *);
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static void p_ntp_time(const struct l_fixedpt *);
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static void p_ntp_delta(const struct l_fixedpt *, const struct l_fixedpt *);
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/*
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* Print ntp requests
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*/
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void
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ntp_print(register const u_char *cp, u_int length)
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{
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register const struct ntpdata *bp;
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int mode, version, leapind;
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bp = (struct ntpdata *)cp;
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/* Note funny sized packets */
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if (length != sizeof(struct ntpdata))
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(void)printf(" [len=%d]", length);
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TCHECK(bp->status);
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version = (int)(bp->status & VERSIONMASK) >> 3;
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printf(" v%d", version);
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leapind = bp->status & LEAPMASK;
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switch (leapind) {
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case NO_WARNING:
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break;
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case PLUS_SEC:
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fputs(" +1s", stdout);
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break;
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case MINUS_SEC:
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fputs(" -1s", stdout);
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break;
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}
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mode = bp->status & MODEMASK;
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switch (mode) {
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case MODE_UNSPEC: /* unspecified */
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fputs(" unspec", stdout);
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break;
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case MODE_SYM_ACT: /* symmetric active */
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fputs(" sym_act", stdout);
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break;
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case MODE_SYM_PAS: /* symmetric passive */
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fputs(" sym_pas", stdout);
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break;
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case MODE_CLIENT: /* client */
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fputs(" client", stdout);
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break;
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case MODE_SERVER: /* server */
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fputs(" server", stdout);
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break;
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case MODE_BROADCAST: /* broadcast */
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fputs(" bcast", stdout);
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break;
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case MODE_RES1: /* reserved */
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fputs(" res1", stdout);
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break;
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case MODE_RES2: /* reserved */
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fputs(" res2", stdout);
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break;
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}
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TCHECK(bp->stratum);
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printf(" strat %d", bp->stratum);
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TCHECK(bp->ppoll);
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printf(" poll %d", bp->ppoll);
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/* Can't TCHECK bp->precision bitfield so bp->distance + 0 instead */
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TCHECK2(bp->distance, 0);
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printf(" prec %d", bp->precision);
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if (!vflag)
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return;
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TCHECK(bp->distance);
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fputs(" dist ", stdout);
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p_sfix(&bp->distance);
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TCHECK(bp->dispersion);
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fputs(" disp ", stdout);
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p_sfix(&bp->dispersion);
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TCHECK(bp->refid);
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fputs(" ref ", stdout);
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/* Interpretation depends on stratum */
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switch (bp->stratum) {
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case UNSPECIFIED:
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printf("(unspec)");
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break;
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case PRIM_REF:
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fn_printn((u_char *)&(bp->refid), 4, NULL);
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break;
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case INFO_QUERY:
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printf("%s INFO_QUERY", ipaddr_string(&(bp->refid)));
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/* this doesn't have more content */
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return;
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case INFO_REPLY:
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printf("%s INFO_REPLY", ipaddr_string(&(bp->refid)));
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/* this is too complex to be worth printing */
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return;
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default:
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printf("%s", ipaddr_string(&(bp->refid)));
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break;
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}
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TCHECK(bp->reftime);
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putchar('@');
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p_ntp_time(&(bp->reftime));
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TCHECK(bp->org);
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fputs(" orig ", stdout);
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p_ntp_time(&(bp->org));
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TCHECK(bp->rec);
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fputs(" rec ", stdout);
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p_ntp_delta(&(bp->org), &(bp->rec));
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TCHECK(bp->xmt);
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fputs(" xmt ", stdout);
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p_ntp_delta(&(bp->org), &(bp->xmt));
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return;
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trunc:
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fputs(" [|ntp]", stdout);
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}
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static void
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p_sfix(register const struct s_fixedpt *sfp)
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{
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register int i;
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register int f;
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register float ff;
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i = ntohs(sfp->int_part);
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f = ntohs(sfp->fraction);
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ff = f / 65536.0; /* shift radix point by 16 bits */
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f = ff * 1000000.0; /* Treat fraction as parts per million */
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printf("%d.%06d", i, f);
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}
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#define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */
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static void
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p_ntp_time(register const struct l_fixedpt *lfp)
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{
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register int32_t i;
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register u_int32_t uf;
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register u_int32_t f;
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register float ff;
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i = ntohl(lfp->int_part);
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uf = ntohl(lfp->fraction);
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ff = uf;
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if (ff < 0.0) /* some compilers are buggy */
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ff += FMAXINT;
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ff = ff / FMAXINT; /* shift radix point by 32 bits */
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f = ff * 1000000000.0; /* treat fraction as parts per billion */
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printf("%u.%09d", i, f);
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}
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/* Prints time difference between *lfp and *olfp */
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static void
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p_ntp_delta(register const struct l_fixedpt *olfp,
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register const struct l_fixedpt *lfp)
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{
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register int32_t i;
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register u_int32_t uf;
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register u_int32_t ouf;
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register u_int32_t f;
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register float ff;
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int signbit;
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i = ntohl(lfp->int_part) - ntohl(olfp->int_part);
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uf = ntohl(lfp->fraction);
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ouf = ntohl(olfp->fraction);
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if (i > 0) { /* new is definitely greater than old */
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signbit = 0;
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f = uf - ouf;
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if (ouf > uf) /* must borrow from high-order bits */
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i -= 1;
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} else if (i < 0) { /* new is definitely less than old */
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signbit = 1;
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f = ouf - uf;
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if (uf > ouf) /* must carry into the high-order bits */
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i += 1;
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i = -i;
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} else { /* int_part is zero */
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if (uf > ouf) {
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signbit = 0;
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f = uf - ouf;
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} else {
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signbit = 1;
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f = ouf - uf;
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}
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}
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ff = f;
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if (ff < 0.0) /* some compilers are buggy */
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ff += FMAXINT;
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ff = ff / FMAXINT; /* shift radix point by 32 bits */
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f = ff * 1000000000.0; /* treat fraction as parts per billion */
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if (signbit)
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putchar('-');
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else
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putchar('+');
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printf("%d.%09d", i, f);
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}
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