/* * Copyright (c) 1988-1990 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 1.2 90/09/24 17:02:26 mccanne Exp $ (LBL)"; #endif #include #include #include #include #include #include #include #include #include "interface.h" #include "addrtoname.h" #include "ntp.h" /* * Print ntp requests */ void ntp_print(bp, length) register struct ntpdata *bp; int length; { static char tstr[] = " [|]"; u_char *ep; int mode, version, leapind; static char rclock[5]; #define TCHECK(var, l) if ((u_char *)&(var) > ep - l) goto trunc /* Note funny sized packets */ if (length != sizeof(struct ntpdata)) (void)printf(" [len=%d]", length); /* 'ep' points to the end of avaible data. */ ep = (u_char *)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: printf(" +1s"); break; case MINUS_SEC: printf(" -1s"); break; } mode = bp->status & MODEMASK; switch (mode) { case MODE_UNSPEC: /* unspecified */ printf(" unspec"); break; case MODE_SYM_ACT: /* symmetric active */ printf(" sym_act"); break; case MODE_SYM_PAS: /* symmetric passive */ printf(" sym_pas"); break; case MODE_CLIENT: /* client */ printf(" client"); break; case MODE_SERVER: /* server */ printf(" server"); break; case MODE_BROADCAST: /* broadcast */ printf(" bcast"); break; case MODE_RES1: /* reserved */ printf(" res1"); break; case MODE_RES2: /* reserved */ printf(" res2"); break; } TCHECK(bp->stratum, sizeof(bp->stratum)); printf(" strat %d", bp->stratum); TCHECK(bp->ppoll, sizeof(bp->ppoll)); printf(" poll %d", bp->ppoll); /* TCHECK(bp->precision, sizeof(bp->precision)); */ /* not legal */ printf(" prec %d", bp->precision); TCHECK(bp->distance, sizeof(bp->distance)); printf(" dist "); p_sfix(&bp->distance); TCHECK(bp->dispersion, sizeof(bp->dispersion)); printf(" disp "); p_sfix(&bp->dispersion); TCHECK(bp->refid, sizeof(bp->refid)); printf(" ref "); /* Interpretation depends on stratum */ switch (bp->stratum) { case UNSPECIFIED: case PRIM_REF: strncpy(rclock, (char *)&(bp->refid), 4); rclock[4] = 0; printf(rclock); 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)); printf("@"); p_ntp_time(&(bp->reftime)); TCHECK(bp->org, sizeof(bp->org)); printf(" orig "); p_ntp_time(&(bp->org)); TCHECK(bp->rec, sizeof(bp->rec)); printf(" rec "); p_ntp_delta(&(bp->org), &(bp->rec)); TCHECK(bp->xmt, sizeof(bp->xmt)); printf(" xmt "); p_ntp_delta(&(bp->org), &(bp->xmt)); return; trunc: fputs(tstr, stdout); #undef TCHECK } p_sfix(sfp) register 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 */ p_ntp_time(lfp) register struct l_fixedpt *lfp; { register long i; register unsigned long uf; register unsigned long 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("%lu.%09d", i, f); } /* Prints time difference between *lfp and *olfp */ p_ntp_delta(olfp, lfp) register struct l_fixedpt *olfp; register struct l_fixedpt *lfp; { register long i; register unsigned long uf; register unsigned long ouf; register unsigned long 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); }