The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that: (1) source code distributions |
| 7 | * retain the above copyright notice and this paragraph in its entirety, (2) |
| 8 | * distributions including binary code include the above copyright notice and |
| 9 | * this paragraph in its entirety in the documentation or other materials |
| 10 | * provided with the distribution, and (3) all advertising materials mentioning |
| 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 |
| 14 | * the University nor the names of its contributors may be used to endorse |
| 15 | * or promote products derived from this software without specific prior |
| 16 | * written permission. |
| 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. |
| 20 | * |
| 21 | * Format and print ntp packets. |
| 22 | * By Jeffrey Mogul/DECWRL |
| 23 | * loosely based on print-bootp.c |
| 24 | */ |
| 25 | |
| 26 | #ifndef lint |
| 27 | static const char rcsid[] _U_ = |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 28 | "@(#) $Header: /tcpdump/master/tcpdump/print-ntp.c,v 1.43 2007-11-30 13:45:10 hannes Exp $ (LBL)"; |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 29 | #endif |
| 30 | |
| 31 | #ifdef HAVE_CONFIG_H |
| 32 | #include "config.h" |
| 33 | #endif |
| 34 | |
| 35 | #include <tcpdump-stdinc.h> |
| 36 | |
| 37 | #include <stdio.h> |
| 38 | #include <string.h> |
| 39 | #ifdef HAVE_STRFTIME |
| 40 | #include <time.h> |
| 41 | #endif |
| 42 | |
| 43 | #include "interface.h" |
| 44 | #include "addrtoname.h" |
| 45 | #include "extract.h" |
| 46 | #ifdef MODEMASK |
| 47 | #undef MODEMASK /* Solaris sucks */ |
| 48 | #endif |
| 49 | #include "ntp.h" |
| 50 | |
| 51 | static void p_sfix(const struct s_fixedpt *); |
| 52 | static void p_ntp_time(const struct l_fixedpt *); |
| 53 | static void p_ntp_delta(const struct l_fixedpt *, const struct l_fixedpt *); |
| 54 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 55 | static const struct tok ntp_mode_values[] = { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 56 | { MODE_UNSPEC, "unspecified" }, |
| 57 | { MODE_SYM_ACT, "symmetric active" }, |
| 58 | { MODE_SYM_PAS, "symmetric passive" }, |
| 59 | { MODE_CLIENT, "Client" }, |
| 60 | { MODE_SERVER, "Server" }, |
| 61 | { MODE_BROADCAST, "Broadcast" }, |
| 62 | { MODE_RES1, "Reserved" }, |
| 63 | { MODE_RES2, "Reserved" }, |
| 64 | { 0, NULL } |
| 65 | }; |
| 66 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 67 | static const struct tok ntp_leapind_values[] = { |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 68 | { NO_WARNING, "" }, |
| 69 | { PLUS_SEC, "+1s" }, |
| 70 | { MINUS_SEC, "-1s" }, |
| 71 | { ALARM, "clock unsynchronized" }, |
| 72 | { 0, NULL } |
| 73 | }; |
| 74 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 75 | static const struct tok ntp_stratum_values[] = { |
| 76 | { UNSPECIFIED, "unspecified" }, |
| 77 | { PRIM_REF, "primary reference" }, |
| 78 | { 0, NULL } |
| 79 | }; |
| 80 | |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 81 | /* |
| 82 | * Print ntp requests |
| 83 | */ |
| 84 | void |
| 85 | ntp_print(register const u_char *cp, u_int length) |
| 86 | { |
| 87 | register const struct ntpdata *bp; |
| 88 | int mode, version, leapind; |
| 89 | |
| 90 | bp = (struct ntpdata *)cp; |
| 91 | |
| 92 | TCHECK(bp->status); |
| 93 | |
| 94 | version = (int)(bp->status & VERSIONMASK) >> 3; |
| 95 | printf("NTPv%d", version); |
| 96 | |
| 97 | mode = bp->status & MODEMASK; |
| 98 | if (!vflag) { |
| 99 | printf (", %s, length %u", |
| 100 | tok2str(ntp_mode_values, "Unknown mode", mode), |
| 101 | length); |
| 102 | return; |
| 103 | } |
| 104 | |
| 105 | printf (", length %u\n\t%s", |
| 106 | length, |
| 107 | tok2str(ntp_mode_values, "Unknown mode", mode)); |
| 108 | |
| 109 | leapind = bp->status & LEAPMASK; |
| 110 | printf (", Leap indicator: %s (%u)", |
| 111 | tok2str(ntp_leapind_values, "Unknown", leapind), |
| 112 | leapind); |
| 113 | |
| 114 | TCHECK(bp->stratum); |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 115 | printf(", Stratum %u (%s)", |
| 116 | bp->stratum, |
| 117 | tok2str(ntp_stratum_values, (bp->stratum >=2 && bp->stratum<=15) ? "secondary reference" : "reserved", bp->stratum)); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 118 | |
| 119 | TCHECK(bp->ppoll); |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 120 | printf(", poll %u (%us)", bp->ppoll, 1 << bp->ppoll); |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 121 | |
| 122 | /* Can't TCHECK bp->precision bitfield so bp->distance + 0 instead */ |
| 123 | TCHECK2(bp->root_delay, 0); |
| 124 | printf(", precision %d", bp->precision); |
| 125 | |
| 126 | TCHECK(bp->root_delay); |
| 127 | fputs("\n\tRoot Delay: ", stdout); |
| 128 | p_sfix(&bp->root_delay); |
| 129 | |
| 130 | TCHECK(bp->root_dispersion); |
| 131 | fputs(", Root dispersion: ", stdout); |
| 132 | p_sfix(&bp->root_dispersion); |
| 133 | |
| 134 | TCHECK(bp->refid); |
| 135 | fputs(", Reference-ID: ", stdout); |
| 136 | /* Interpretation depends on stratum */ |
| 137 | switch (bp->stratum) { |
| 138 | |
| 139 | case UNSPECIFIED: |
| 140 | printf("(unspec)"); |
| 141 | break; |
| 142 | |
| 143 | case PRIM_REF: |
| 144 | if (fn_printn((u_char *)&(bp->refid), 4, snapend)) |
| 145 | goto trunc; |
| 146 | break; |
| 147 | |
| 148 | case INFO_QUERY: |
| 149 | printf("%s INFO_QUERY", ipaddr_string(&(bp->refid))); |
| 150 | /* this doesn't have more content */ |
| 151 | return; |
| 152 | |
| 153 | case INFO_REPLY: |
| 154 | printf("%s INFO_REPLY", ipaddr_string(&(bp->refid))); |
| 155 | /* this is too complex to be worth printing */ |
| 156 | return; |
| 157 | |
| 158 | default: |
| 159 | printf("%s", ipaddr_string(&(bp->refid))); |
| 160 | break; |
| 161 | } |
| 162 | |
| 163 | TCHECK(bp->ref_timestamp); |
| 164 | fputs("\n\t Reference Timestamp: ", stdout); |
| 165 | p_ntp_time(&(bp->ref_timestamp)); |
| 166 | |
| 167 | TCHECK(bp->org_timestamp); |
| 168 | fputs("\n\t Originator Timestamp: ", stdout); |
| 169 | p_ntp_time(&(bp->org_timestamp)); |
| 170 | |
| 171 | TCHECK(bp->rec_timestamp); |
| 172 | fputs("\n\t Receive Timestamp: ", stdout); |
| 173 | p_ntp_time(&(bp->rec_timestamp)); |
| 174 | |
| 175 | TCHECK(bp->xmt_timestamp); |
| 176 | fputs("\n\t Transmit Timestamp: ", stdout); |
| 177 | p_ntp_time(&(bp->xmt_timestamp)); |
| 178 | |
| 179 | fputs("\n\t Originator - Receive Timestamp: ", stdout); |
| 180 | p_ntp_delta(&(bp->org_timestamp), &(bp->rec_timestamp)); |
| 181 | |
| 182 | fputs("\n\t Originator - Transmit Timestamp: ", stdout); |
| 183 | p_ntp_delta(&(bp->org_timestamp), &(bp->xmt_timestamp)); |
| 184 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 185 | if ( (sizeof(struct ntpdata) - length) == 16) { /* Optional: key-id */ |
| 186 | TCHECK(bp->key_id); |
| 187 | printf("\n\tKey id: %u", bp->key_id); |
| 188 | } else if ( (sizeof(struct ntpdata) - length) == 0) { /* Optional: key-id + authentication */ |
| 189 | TCHECK(bp->key_id); |
| 190 | printf("\n\tKey id: %u", bp->key_id); |
| 191 | TCHECK2(bp->message_digest, sizeof (bp->message_digest)); |
| 192 | printf("\n\tAuthentication: %08x%08x%08x%08x", |
| 193 | EXTRACT_32BITS(bp->message_digest), |
| 194 | EXTRACT_32BITS(bp->message_digest + 4), |
| 195 | EXTRACT_32BITS(bp->message_digest + 8), |
| 196 | EXTRACT_32BITS(bp->message_digest + 12)); |
| 197 | } |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 198 | return; |
| 199 | |
| 200 | trunc: |
| 201 | fputs(" [|ntp]", stdout); |
| 202 | } |
| 203 | |
| 204 | static void |
| 205 | p_sfix(register const struct s_fixedpt *sfp) |
| 206 | { |
| 207 | register int i; |
| 208 | register int f; |
| 209 | register float ff; |
| 210 | |
| 211 | i = EXTRACT_16BITS(&sfp->int_part); |
| 212 | f = EXTRACT_16BITS(&sfp->fraction); |
| 213 | ff = f / 65536.0; /* shift radix point by 16 bits */ |
| 214 | f = ff * 1000000.0; /* Treat fraction as parts per million */ |
| 215 | printf("%d.%06d", i, f); |
| 216 | } |
| 217 | |
| 218 | #define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */ |
| 219 | |
| 220 | static void |
| 221 | p_ntp_time(register const struct l_fixedpt *lfp) |
| 222 | { |
| 223 | register int32_t i; |
| 224 | register u_int32_t uf; |
| 225 | register u_int32_t f; |
| 226 | register float ff; |
| 227 | |
| 228 | i = EXTRACT_32BITS(&lfp->int_part); |
| 229 | uf = EXTRACT_32BITS(&lfp->fraction); |
| 230 | ff = uf; |
| 231 | if (ff < 0.0) /* some compilers are buggy */ |
| 232 | ff += FMAXINT; |
| 233 | ff = ff / FMAXINT; /* shift radix point by 32 bits */ |
| 234 | f = ff * 1000000000.0; /* treat fraction as parts per billion */ |
| 235 | printf("%u.%09d", i, f); |
| 236 | |
| 237 | #ifdef HAVE_STRFTIME |
| 238 | /* |
| 239 | * print the time in human-readable format. |
| 240 | */ |
| 241 | if (i) { |
| 242 | time_t seconds = i - JAN_1970; |
| 243 | struct tm *tm; |
| 244 | char time_buf[128]; |
| 245 | |
| 246 | tm = localtime(&seconds); |
| 247 | strftime(time_buf, sizeof (time_buf), "%Y/%m/%d %H:%M:%S", tm); |
| 248 | printf (" (%s)", time_buf); |
| 249 | } |
| 250 | #endif |
| 251 | } |
| 252 | |
| 253 | /* Prints time difference between *lfp and *olfp */ |
| 254 | static void |
| 255 | p_ntp_delta(register const struct l_fixedpt *olfp, |
| 256 | register const struct l_fixedpt *lfp) |
| 257 | { |
| 258 | register int32_t i; |
| 259 | register u_int32_t u, uf; |
| 260 | register u_int32_t ou, ouf; |
| 261 | register u_int32_t f; |
| 262 | register float ff; |
| 263 | int signbit; |
| 264 | |
| 265 | u = EXTRACT_32BITS(&lfp->int_part); |
| 266 | ou = EXTRACT_32BITS(&olfp->int_part); |
| 267 | uf = EXTRACT_32BITS(&lfp->fraction); |
| 268 | ouf = EXTRACT_32BITS(&olfp->fraction); |
| 269 | if (ou == 0 && ouf == 0) { |
| 270 | p_ntp_time(lfp); |
| 271 | return; |
| 272 | } |
| 273 | |
| 274 | i = u - ou; |
| 275 | |
| 276 | if (i > 0) { /* new is definitely greater than old */ |
| 277 | signbit = 0; |
| 278 | f = uf - ouf; |
| 279 | if (ouf > uf) /* must borrow from high-order bits */ |
| 280 | i -= 1; |
| 281 | } else if (i < 0) { /* new is definitely less than old */ |
| 282 | signbit = 1; |
| 283 | f = ouf - uf; |
| 284 | if (uf > ouf) /* must carry into the high-order bits */ |
| 285 | i += 1; |
| 286 | i = -i; |
| 287 | } else { /* int_part is zero */ |
| 288 | if (uf > ouf) { |
| 289 | signbit = 0; |
| 290 | f = uf - ouf; |
| 291 | } else { |
| 292 | signbit = 1; |
| 293 | f = ouf - uf; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | ff = f; |
| 298 | if (ff < 0.0) /* some compilers are buggy */ |
| 299 | ff += FMAXINT; |
| 300 | ff = ff / FMAXINT; /* shift radix point by 32 bits */ |
| 301 | f = ff * 1000000000.0; /* treat fraction as parts per billion */ |
| 302 | if (signbit) |
| 303 | putchar('-'); |
| 304 | else |
| 305 | putchar('+'); |
| 306 | printf("%d.%09d", i, f); |
| 307 | } |
| 308 | |