| /* |
| * 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[] = |
| "@(#) $Header: /tcpdump/master/tcpdump/print-ntp.c,v 1.28 2000-07-01 03:39:07 assar Exp $ (LBL)"; |
| #endif |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <sys/param.h> |
| #include <sys/time.h> |
| #include <sys/socket.h> |
| |
| struct mbuf; |
| struct rtentry; |
| #include <net/if.h> |
| |
| #include <netinet/in.h> |
| #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 |
| */ |
| void |
| ntp_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 void |
| p_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 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 = 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 void |
| p_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); |
| } |