source: rtems-libbsd/freebsd/contrib/tcpdump/print-ntp.c @ 084d4db

#include <machine/rtems-bsd-user-space.h>

/*
 * 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[] _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 %u (%us)", bp->ppoll, 1 << 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 */
                TCHECK(bp->key_id);
                printf("\n\tKey id: %u", bp->key_id);
        } else if ( (sizeof(struct ntpdata) - length) == 0) {   /* Optional: key-id + authentication */
                TCHECK(bp->key_id);
                printf("\n\tKey id: %u", bp->key_id);
                TCHECK2(bp->message_digest, sizeof (bp->message_digest));
                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);
}