/* * 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 lint static const char rcsid[] _U_ = "@(#) $Header: /tcpdump/master/tcpdump/print-ntp.c,v 1.37.2.2 2003/11/16 08:51:36 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #ifdef HAVE_STRFTIME #include #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 *); /* * 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("NTPv%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((u_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 = 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 /* * For extra verbosity, print the time in human-readable format. */ if (vflag > 1 && 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); }