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12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 * Format and print ntp packets.
22 * By Jeffrey Mogul/DECWRL
23 * loosely based on print-bootp.c
29 static const char rcsid[] =
30 "@(#) $Header: /tcpdump/master/tcpdump/print-ntp.c,v 1.27 1999/11/21 09:36:57 fenner Exp $ (LBL)";
37 #include <sys/param.h>
39 #include <sys/socket.h>
47 #include <netinet/in.h>
48 #include <net/ethernet.h>
54 #include "interface.h"
55 #include "addrtoname.h"
57 #undef MODEMASK /* Solaris sucks */
61 static void p_sfix(const struct s_fixedpt *);
62 static void p_ntp_time(const struct l_fixedpt *);
63 static void p_ntp_delta(const struct l_fixedpt *, const struct l_fixedpt *);
69 ntp_print(register const u_char *cp, u_int length)
71 register const struct ntpdata *bp;
72 int mode, version, leapind;
73 static char rclock[5];
75 bp = (struct ntpdata *)cp;
76 /* Note funny sized packets */
77 if (length != sizeof(struct ntpdata))
78 (void)printf(" [len=%d]", length);
82 version = (int)(bp->status & VERSIONMASK) >> 3;
83 printf(" v%d", version);
85 leapind = bp->status & LEAPMASK;
92 fputs(" +1s", stdout);
96 fputs(" -1s", stdout);
100 mode = bp->status & MODEMASK;
103 case MODE_UNSPEC: /* unspecified */
104 fputs(" unspec", stdout);
107 case MODE_SYM_ACT: /* symmetric active */
108 fputs(" sym_act", stdout);
111 case MODE_SYM_PAS: /* symmetric passive */
112 fputs(" sym_pas", stdout);
115 case MODE_CLIENT: /* client */
116 fputs(" client", stdout);
119 case MODE_SERVER: /* server */
120 fputs(" server", stdout);
123 case MODE_BROADCAST: /* broadcast */
124 fputs(" bcast", stdout);
127 case MODE_RES1: /* reserved */
128 fputs(" res1", stdout);
131 case MODE_RES2: /* reserved */
132 fputs(" res2", stdout);
138 printf(" strat %d", bp->stratum);
141 printf(" poll %d", bp->ppoll);
143 /* Can't TCHECK bp->precision bitfield so bp->distance + 0 instead */
144 TCHECK2(bp->distance, 0);
145 printf(" prec %d", bp->precision);
150 TCHECK(bp->distance);
151 fputs(" dist ", stdout);
152 p_sfix(&bp->distance);
154 TCHECK(bp->dispersion);
155 fputs(" disp ", stdout);
156 p_sfix(&bp->dispersion);
159 fputs(" ref ", stdout);
160 /* Interpretation depends on stratum */
161 switch (bp->stratum) {
168 strncpy(rclock, (char *)&(bp->refid), 4);
170 fputs(rclock, stdout);
174 printf("%s INFO_QUERY", ipaddr_string(&(bp->refid)));
175 /* this doesn't have more content */
179 printf("%s INFO_REPLY", ipaddr_string(&(bp->refid)));
180 /* this is too complex to be worth printing */
184 printf("%s", ipaddr_string(&(bp->refid)));
190 p_ntp_time(&(bp->reftime));
193 fputs(" orig ", stdout);
194 p_ntp_time(&(bp->org));
197 fputs(" rec ", stdout);
198 p_ntp_delta(&(bp->org), &(bp->rec));
201 fputs(" xmt ", stdout);
202 p_ntp_delta(&(bp->org), &(bp->xmt));
207 fputs(" [|ntp]", stdout);
211 p_sfix(register const struct s_fixedpt *sfp)
217 i = ntohs(sfp->int_part);
218 f = ntohs(sfp->fraction);
219 ff = f / 65536.0; /* shift radix point by 16 bits */
220 f = ff * 1000000.0; /* Treat fraction as parts per million */
221 printf("%d.%06d", i, f);
224 #define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */
227 p_ntp_time(register const struct l_fixedpt *lfp)
230 register u_int32_t uf;
231 register u_int32_t f;
234 i = ntohl(lfp->int_part);
235 uf = ntohl(lfp->fraction);
237 if (ff < 0.0) /* some compilers are buggy */
239 ff = ff / FMAXINT; /* shift radix point by 32 bits */
240 f = ff * 1000000000.0; /* treat fraction as parts per billion */
241 printf("%u.%09d", i, f);
244 /* Prints time difference between *lfp and *olfp */
246 p_ntp_delta(register const struct l_fixedpt *olfp,
247 register const struct l_fixedpt *lfp)
250 register u_int32_t uf;
251 register u_int32_t ouf;
252 register u_int32_t f;
256 i = ntohl(lfp->int_part) - ntohl(olfp->int_part);
258 uf = ntohl(lfp->fraction);
259 ouf = ntohl(olfp->fraction);
261 if (i > 0) { /* new is definitely greater than old */
264 if (ouf > uf) /* must borrow from high-order bits */
266 } else if (i < 0) { /* new is definitely less than old */
269 if (uf > ouf) /* must carry into the high-order bits */
272 } else { /* int_part is zero */
283 if (ff < 0.0) /* some compilers are buggy */
285 ff = ff / FMAXINT; /* shift radix point by 32 bits */
286 f = ff * 1000000000.0; /* treat fraction as parts per billion */
291 printf("%d.%09d", i, f);