/* * 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 lintstatic const char rcsid[] =    "@(#) $Header: print-ntp.c,v 1.26 97/06/13 12:56:37 leres Exp $ (LBL)";#endif#ifndef WIN32#include <sys/param.h>#include <sys/time.h>#include <sys/socket.h>#else
#include <winsock.h>
#endif
#if __STDC__struct mbuf;struct rtentry;#endif#include <net/if.h>#ifndef WIN32
#include <netinet/in.h>#endif
#include <netinet/if_ether.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 */voidntp_print(register const u_char *cp, u_int length){	register const struct ntpdata *bp;	int mode, version, leapind;	static char rclock[5];	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:		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);	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 voidp_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 voidp_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 voidp_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);}