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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 1.43 2007-11-30 13:45:10 hannes 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" },
77 static struct tok ntp_stratum_values[] = {
78 { UNSPECIFIED, "unspecified" },
79 { PRIM_REF, "primary reference" },
87 ntp_print(register const u_char *cp, u_int length)
89 register const struct ntpdata *bp;
90 int mode, version, leapind;
92 bp = (struct ntpdata *)cp;
96 version = (int)(bp->status & VERSIONMASK) >> 3;
97 printf("NTPv%d", version);
99 mode = bp->status & MODEMASK;
101 printf (", %s, length %u",
102 tok2str(ntp_mode_values, "Unknown mode", mode),
107 printf (", length %u\n\t%s",
109 tok2str(ntp_mode_values, "Unknown mode", mode));
111 leapind = bp->status & LEAPMASK;
112 printf (", Leap indicator: %s (%u)",
113 tok2str(ntp_leapind_values, "Unknown", leapind),
117 printf(", Stratum %u (%s)",
119 tok2str(ntp_stratum_values, (bp->stratum >=2 && bp->stratum<=15) ? "secondary reference" : "reserved", bp->stratum));
122 printf(", poll %u (%us)", bp->ppoll, 1 << bp->ppoll);
124 /* Can't TCHECK bp->precision bitfield so bp->distance + 0 instead */
125 TCHECK2(bp->root_delay, 0);
126 printf(", precision %d", bp->precision);
128 TCHECK(bp->root_delay);
129 fputs("\n\tRoot Delay: ", stdout);
130 p_sfix(&bp->root_delay);
132 TCHECK(bp->root_dispersion);
133 fputs(", Root dispersion: ", stdout);
134 p_sfix(&bp->root_dispersion);
137 fputs(", Reference-ID: ", stdout);
138 /* Interpretation depends on stratum */
139 switch (bp->stratum) {
146 if (fn_printn((u_char *)&(bp->refid), 4, snapend))
151 printf("%s INFO_QUERY", ipaddr_string(&(bp->refid)));
152 /* this doesn't have more content */
156 printf("%s INFO_REPLY", ipaddr_string(&(bp->refid)));
157 /* this is too complex to be worth printing */
161 printf("%s", ipaddr_string(&(bp->refid)));
165 TCHECK(bp->ref_timestamp);
166 fputs("\n\t Reference Timestamp: ", stdout);
167 p_ntp_time(&(bp->ref_timestamp));
169 TCHECK(bp->org_timestamp);
170 fputs("\n\t Originator Timestamp: ", stdout);
171 p_ntp_time(&(bp->org_timestamp));
173 TCHECK(bp->rec_timestamp);
174 fputs("\n\t Receive Timestamp: ", stdout);
175 p_ntp_time(&(bp->rec_timestamp));
177 TCHECK(bp->xmt_timestamp);
178 fputs("\n\t Transmit Timestamp: ", stdout);
179 p_ntp_time(&(bp->xmt_timestamp));
181 fputs("\n\t Originator - Receive Timestamp: ", stdout);
182 p_ntp_delta(&(bp->org_timestamp), &(bp->rec_timestamp));
184 fputs("\n\t Originator - Transmit Timestamp: ", stdout);
185 p_ntp_delta(&(bp->org_timestamp), &(bp->xmt_timestamp));
187 if ( (sizeof(struct ntpdata) - length) == 16) { /* Optional: key-id */
189 printf("\n\tKey id: %u", bp->key_id);
190 } else if ( (sizeof(struct ntpdata) - length) == 0) { /* Optional: key-id + authentication */
192 printf("\n\tKey id: %u", bp->key_id);
193 TCHECK2(bp->message_digest, sizeof (bp->message_digest));
194 printf("\n\tAuthentication: %08x%08x%08x%08x",
195 EXTRACT_32BITS(bp->message_digest),
196 EXTRACT_32BITS(bp->message_digest + 4),
197 EXTRACT_32BITS(bp->message_digest + 8),
198 EXTRACT_32BITS(bp->message_digest + 12));
203 fputs(" [|ntp]", stdout);
207 p_sfix(register const struct s_fixedpt *sfp)
213 i = EXTRACT_16BITS(&sfp->int_part);
214 f = EXTRACT_16BITS(&sfp->fraction);
215 ff = f / 65536.0; /* shift radix point by 16 bits */
216 f = ff * 1000000.0; /* Treat fraction as parts per million */
217 printf("%d.%06d", i, f);
220 #define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */
223 p_ntp_time(register const struct l_fixedpt *lfp)
226 register u_int32_t uf;
227 register u_int32_t f;
230 i = EXTRACT_32BITS(&lfp->int_part);
231 uf = EXTRACT_32BITS(&lfp->fraction);
233 if (ff < 0.0) /* some compilers are buggy */
235 ff = ff / FMAXINT; /* shift radix point by 32 bits */
236 f = ff * 1000000000.0; /* treat fraction as parts per billion */
237 printf("%u.%09d", i, f);
241 * print the time in human-readable format.
244 time_t seconds = i - JAN_1970;
248 tm = localtime(&seconds);
249 strftime(time_buf, sizeof (time_buf), "%Y/%m/%d %H:%M:%S", tm);
250 printf (" (%s)", time_buf);
255 /* Prints time difference between *lfp and *olfp */
257 p_ntp_delta(register const struct l_fixedpt *olfp,
258 register const struct l_fixedpt *lfp)
261 register u_int32_t u, uf;
262 register u_int32_t ou, ouf;
263 register u_int32_t f;
267 u = EXTRACT_32BITS(&lfp->int_part);
268 ou = EXTRACT_32BITS(&olfp->int_part);
269 uf = EXTRACT_32BITS(&lfp->fraction);
270 ouf = EXTRACT_32BITS(&olfp->fraction);
271 if (ou == 0 && ouf == 0) {
278 if (i > 0) { /* new is definitely greater than old */
281 if (ouf > uf) /* must borrow from high-order bits */
283 } else if (i < 0) { /* new is definitely less than old */
286 if (uf > ouf) /* must carry into the high-order bits */
289 } else { /* int_part is zero */
300 if (ff < 0.0) /* some compilers are buggy */
302 ff = ff / FMAXINT; /* shift radix point by 32 bits */
303 f = ff * 1000000000.0; /* treat fraction as parts per billion */
308 printf("%d.%09d", i, f);