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7 * retain the above copyright notice and this paragraph in its entirety, (2)
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11 * features or use of this software display the following acknowledgement:
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 1.31 2000/10/06 04:23:13 guy 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;
66 static char rclock[5];
68 bp = (struct ntpdata *)cp;
69 /* Note funny sized packets */
70 if (length != sizeof(struct ntpdata))
71 (void)printf(" [len=%d]", length);
75 version = (int)(bp->status & VERSIONMASK) >> 3;
76 printf(" v%d", version);
78 leapind = bp->status & LEAPMASK;
85 fputs(" +1s", stdout);
89 fputs(" -1s", stdout);
93 mode = bp->status & MODEMASK;
96 case MODE_UNSPEC: /* unspecified */
97 fputs(" unspec", stdout);
100 case MODE_SYM_ACT: /* symmetric active */
101 fputs(" sym_act", stdout);
104 case MODE_SYM_PAS: /* symmetric passive */
105 fputs(" sym_pas", stdout);
108 case MODE_CLIENT: /* client */
109 fputs(" client", stdout);
112 case MODE_SERVER: /* server */
113 fputs(" server", stdout);
116 case MODE_BROADCAST: /* broadcast */
117 fputs(" bcast", stdout);
120 case MODE_RES1: /* reserved */
121 fputs(" res1", stdout);
124 case MODE_RES2: /* reserved */
125 fputs(" res2", stdout);
131 printf(" strat %d", bp->stratum);
134 printf(" poll %d", bp->ppoll);
136 /* Can't TCHECK bp->precision bitfield so bp->distance + 0 instead */
137 TCHECK2(bp->distance, 0);
138 printf(" prec %d", bp->precision);
143 TCHECK(bp->distance);
144 fputs(" dist ", stdout);
145 p_sfix(&bp->distance);
147 TCHECK(bp->dispersion);
148 fputs(" disp ", stdout);
149 p_sfix(&bp->dispersion);
152 fputs(" ref ", stdout);
153 /* Interpretation depends on stratum */
154 switch (bp->stratum) {
161 strncpy(rclock, (char *)&(bp->refid), 4);
163 fputs(rclock, stdout);
167 printf("%s INFO_QUERY", ipaddr_string(&(bp->refid)));
168 /* this doesn't have more content */
172 printf("%s INFO_REPLY", ipaddr_string(&(bp->refid)));
173 /* this is too complex to be worth printing */
177 printf("%s", ipaddr_string(&(bp->refid)));
183 p_ntp_time(&(bp->reftime));
186 fputs(" orig ", stdout);
187 p_ntp_time(&(bp->org));
190 fputs(" rec ", stdout);
191 p_ntp_delta(&(bp->org), &(bp->rec));
194 fputs(" xmt ", stdout);
195 p_ntp_delta(&(bp->org), &(bp->xmt));
200 fputs(" [|ntp]", stdout);
204 p_sfix(register const struct s_fixedpt *sfp)
210 i = ntohs(sfp->int_part);
211 f = ntohs(sfp->fraction);
212 ff = f / 65536.0; /* shift radix point by 16 bits */
213 f = ff * 1000000.0; /* Treat fraction as parts per million */
214 printf("%d.%06d", i, f);
217 #define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */
220 p_ntp_time(register const struct l_fixedpt *lfp)
223 register u_int32_t uf;
224 register u_int32_t f;
227 i = ntohl(lfp->int_part);
228 uf = ntohl(lfp->fraction);
230 if (ff < 0.0) /* some compilers are buggy */
232 ff = ff / FMAXINT; /* shift radix point by 32 bits */
233 f = ff * 1000000000.0; /* treat fraction as parts per billion */
234 printf("%u.%09d", i, f);
237 /* Prints time difference between *lfp and *olfp */
239 p_ntp_delta(register const struct l_fixedpt *olfp,
240 register const struct l_fixedpt *lfp)
243 register u_int32_t uf;
244 register u_int32_t ouf;
245 register u_int32_t f;
249 i = ntohl(lfp->int_part) - ntohl(olfp->int_part);
251 uf = ntohl(lfp->fraction);
252 ouf = ntohl(olfp->fraction);
254 if (i > 0) { /* new is definitely greater than old */
257 if (ouf > uf) /* must borrow from high-order bits */
259 } else if (i < 0) { /* new is definitely less than old */
262 if (uf > ouf) /* must carry into the high-order bits */
265 } else { /* int_part is zero */
276 if (ff < 0.0) /* some compilers are buggy */
278 ff = ff / FMAXINT; /* shift radix point by 32 bits */
279 f = ff * 1000000000.0; /* treat fraction as parts per billion */
284 printf("%d.%09d", i, f);