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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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21 * Format and print ntp packets.
22 * By Jeffrey Mogul/DECWRL
23 * loosely based on print-bootp.c
29 static const char rcsid[] _U_ =
30 "@(#) $Header: /tcpdump/master/tcpdump/print-ntp.c,v 1.41.2.1 2005/05/06 07:57:18 guy Exp $ (LBL)";
37 #include <tcpdump-stdinc.h>
45 #include "interface.h"
46 #include "addrtoname.h"
49 #undef MODEMASK /* Solaris sucks */
53 static void p_sfix(const struct s_fixedpt *);
54 static void p_ntp_time(const struct l_fixedpt *);
55 static void p_ntp_delta(const struct l_fixedpt *, const struct l_fixedpt *);
57 static struct tok ntp_mode_values[] = {
58 { MODE_UNSPEC, "unspecified" },
59 { MODE_SYM_ACT, "symmetric active" },
60 { MODE_SYM_PAS, "symmetric passive" },
61 { MODE_CLIENT, "Client" },
62 { MODE_SERVER, "Server" },
63 { MODE_BROADCAST, "Broadcast" },
64 { MODE_RES1, "Reserved" },
65 { MODE_RES2, "Reserved" },
69 static struct tok ntp_leapind_values[] = {
73 { ALARM, "clock unsynchronized" },
81 ntp_print(register const u_char *cp, u_int length)
83 register const struct ntpdata *bp;
84 int mode, version, leapind;
86 bp = (struct ntpdata *)cp;
90 version = (int)(bp->status & VERSIONMASK) >> 3;
91 printf("NTPv%d", version);
93 mode = bp->status & MODEMASK;
95 printf (", %s, length %u",
96 tok2str(ntp_mode_values, "Unknown mode", mode),
101 printf (", length %u\n\t%s",
103 tok2str(ntp_mode_values, "Unknown mode", mode));
105 leapind = bp->status & LEAPMASK;
106 printf (", Leap indicator: %s (%u)",
107 tok2str(ntp_leapind_values, "Unknown", leapind),
111 printf(", Stratum %u", bp->stratum);
114 printf(", poll %us", bp->ppoll);
116 /* Can't TCHECK bp->precision bitfield so bp->distance + 0 instead */
117 TCHECK2(bp->root_delay, 0);
118 printf(", precision %d", bp->precision);
120 TCHECK(bp->root_delay);
121 fputs("\n\tRoot Delay: ", stdout);
122 p_sfix(&bp->root_delay);
124 TCHECK(bp->root_dispersion);
125 fputs(", Root dispersion: ", stdout);
126 p_sfix(&bp->root_dispersion);
129 fputs(", Reference-ID: ", stdout);
130 /* Interpretation depends on stratum */
131 switch (bp->stratum) {
138 if (fn_printn((u_char *)&(bp->refid), 4, snapend))
143 printf("%s INFO_QUERY", ipaddr_string(&(bp->refid)));
144 /* this doesn't have more content */
148 printf("%s INFO_REPLY", ipaddr_string(&(bp->refid)));
149 /* this is too complex to be worth printing */
153 printf("%s", ipaddr_string(&(bp->refid)));
157 TCHECK(bp->ref_timestamp);
158 fputs("\n\t Reference Timestamp: ", stdout);
159 p_ntp_time(&(bp->ref_timestamp));
161 TCHECK(bp->org_timestamp);
162 fputs("\n\t Originator Timestamp: ", stdout);
163 p_ntp_time(&(bp->org_timestamp));
165 TCHECK(bp->rec_timestamp);
166 fputs("\n\t Receive Timestamp: ", stdout);
167 p_ntp_time(&(bp->rec_timestamp));
169 TCHECK(bp->xmt_timestamp);
170 fputs("\n\t Transmit Timestamp: ", stdout);
171 p_ntp_time(&(bp->xmt_timestamp));
173 fputs("\n\t Originator - Receive Timestamp: ", stdout);
174 p_ntp_delta(&(bp->org_timestamp), &(bp->rec_timestamp));
176 fputs("\n\t Originator - Transmit Timestamp: ", stdout);
177 p_ntp_delta(&(bp->org_timestamp), &(bp->xmt_timestamp));
179 /* FIXME key-id, authentication */
184 fputs(" [|ntp]", stdout);
188 p_sfix(register const struct s_fixedpt *sfp)
194 i = EXTRACT_16BITS(&sfp->int_part);
195 f = EXTRACT_16BITS(&sfp->fraction);
196 ff = f / 65536.0; /* shift radix point by 16 bits */
197 f = ff * 1000000.0; /* Treat fraction as parts per million */
198 printf("%d.%06d", i, f);
201 #define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */
204 p_ntp_time(register const struct l_fixedpt *lfp)
207 register u_int32_t uf;
208 register u_int32_t f;
211 i = EXTRACT_32BITS(&lfp->int_part);
212 uf = EXTRACT_32BITS(&lfp->fraction);
214 if (ff < 0.0) /* some compilers are buggy */
216 ff = ff / FMAXINT; /* shift radix point by 32 bits */
217 f = ff * 1000000000.0; /* treat fraction as parts per billion */
218 printf("%u.%09d", i, f);
222 * print the time in human-readable format.
225 time_t seconds = i - JAN_1970;
229 tm = localtime(&seconds);
230 strftime(time_buf, sizeof (time_buf), "%Y/%m/%d %H:%M:%S", tm);
231 printf (" (%s)", time_buf);
236 /* Prints time difference between *lfp and *olfp */
238 p_ntp_delta(register const struct l_fixedpt *olfp,
239 register const struct l_fixedpt *lfp)
242 register u_int32_t u, uf;
243 register u_int32_t ou, ouf;
244 register u_int32_t f;
248 u = EXTRACT_32BITS(&lfp->int_part);
249 ou = EXTRACT_32BITS(&olfp->int_part);
250 uf = EXTRACT_32BITS(&lfp->fraction);
251 ouf = EXTRACT_32BITS(&olfp->fraction);
252 if (ou == 0 && ouf == 0) {
259 if (i > 0) { /* new is definitely greater than old */
262 if (ouf > uf) /* must borrow from high-order bits */
264 } else if (i < 0) { /* new is definitely less than old */
267 if (uf > ouf) /* must carry into the high-order bits */
270 } else { /* int_part is zero */
281 if (ff < 0.0) /* some compilers are buggy */
283 ff = ff / FMAXINT; /* shift radix point by 32 bits */
284 f = ff * 1000000000.0; /* treat fraction as parts per billion */
289 printf("%d.%09d", i, f);