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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
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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 1.32 2001/08/20 15:36:57 fenner Exp $ (LBL)";
37 #include <sys/param.h>
39 #include <sys/socket.h>
41 #include <netinet/in.h>
47 #include "interface.h"
48 #include "addrtoname.h"
50 #undef MODEMASK /* Solaris sucks */
54 static void p_sfix(const struct s_fixedpt *);
55 static void p_ntp_time(const struct l_fixedpt *);
56 static void p_ntp_delta(const struct l_fixedpt *, const struct l_fixedpt *);
62 ntp_print(register const u_char *cp, u_int length)
64 register const struct ntpdata *bp;
65 int mode, version, leapind;
67 bp = (struct ntpdata *)cp;
68 /* Note funny sized packets */
69 if (length != sizeof(struct ntpdata))
70 (void)printf(" [len=%d]", length);
74 version = (int)(bp->status & VERSIONMASK) >> 3;
75 printf(" v%d", version);
77 leapind = bp->status & LEAPMASK;
84 fputs(" +1s", stdout);
88 fputs(" -1s", stdout);
92 mode = bp->status & MODEMASK;
95 case MODE_UNSPEC: /* unspecified */
96 fputs(" unspec", stdout);
99 case MODE_SYM_ACT: /* symmetric active */
100 fputs(" sym_act", stdout);
103 case MODE_SYM_PAS: /* symmetric passive */
104 fputs(" sym_pas", stdout);
107 case MODE_CLIENT: /* client */
108 fputs(" client", stdout);
111 case MODE_SERVER: /* server */
112 fputs(" server", stdout);
115 case MODE_BROADCAST: /* broadcast */
116 fputs(" bcast", stdout);
119 case MODE_RES1: /* reserved */
120 fputs(" res1", stdout);
123 case MODE_RES2: /* reserved */
124 fputs(" res2", stdout);
130 printf(" strat %d", bp->stratum);
133 printf(" poll %d", bp->ppoll);
135 /* Can't TCHECK bp->precision bitfield so bp->distance + 0 instead */
136 TCHECK2(bp->distance, 0);
137 printf(" prec %d", bp->precision);
142 TCHECK(bp->distance);
143 fputs(" dist ", stdout);
144 p_sfix(&bp->distance);
146 TCHECK(bp->dispersion);
147 fputs(" disp ", stdout);
148 p_sfix(&bp->dispersion);
151 fputs(" ref ", stdout);
152 /* Interpretation depends on stratum */
153 switch (bp->stratum) {
160 fn_printn((char *)&(bp->refid), 4, NULL);
164 printf("%s INFO_QUERY", ipaddr_string(&(bp->refid)));
165 /* this doesn't have more content */
169 printf("%s INFO_REPLY", ipaddr_string(&(bp->refid)));
170 /* this is too complex to be worth printing */
174 printf("%s", ipaddr_string(&(bp->refid)));
180 p_ntp_time(&(bp->reftime));
183 fputs(" orig ", stdout);
184 p_ntp_time(&(bp->org));
187 fputs(" rec ", stdout);
188 p_ntp_delta(&(bp->org), &(bp->rec));
191 fputs(" xmt ", stdout);
192 p_ntp_delta(&(bp->org), &(bp->xmt));
197 fputs(" [|ntp]", stdout);
201 p_sfix(register const struct s_fixedpt *sfp)
207 i = ntohs(sfp->int_part);
208 f = ntohs(sfp->fraction);
209 ff = f / 65536.0; /* shift radix point by 16 bits */
210 f = ff * 1000000.0; /* Treat fraction as parts per million */
211 printf("%d.%06d", i, f);
214 #define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */
217 p_ntp_time(register const struct l_fixedpt *lfp)
220 register u_int32_t uf;
221 register u_int32_t f;
224 i = ntohl(lfp->int_part);
225 uf = ntohl(lfp->fraction);
227 if (ff < 0.0) /* some compilers are buggy */
229 ff = ff / FMAXINT; /* shift radix point by 32 bits */
230 f = ff * 1000000000.0; /* treat fraction as parts per billion */
231 printf("%u.%09d", i, f);
234 /* Prints time difference between *lfp and *olfp */
236 p_ntp_delta(register const struct l_fixedpt *olfp,
237 register const struct l_fixedpt *lfp)
240 register u_int32_t uf;
241 register u_int32_t ouf;
242 register u_int32_t f;
246 i = ntohl(lfp->int_part) - ntohl(olfp->int_part);
248 uf = ntohl(lfp->fraction);
249 ouf = ntohl(olfp->fraction);
251 if (i > 0) { /* new is definitely greater than old */
254 if (ouf > uf) /* must borrow from high-order bits */
256 } else if (i < 0) { /* new is definitely less than old */
259 if (uf > ouf) /* must carry into the high-order bits */
262 } else { /* int_part is zero */
273 if (ff < 0.0) /* some compilers are buggy */
275 ff = ff / FMAXINT; /* shift radix point by 32 bits */
276 f = ff * 1000000000.0; /* treat fraction as parts per billion */
281 printf("%d.%09d", i, f);