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 * $FreeBSD$ 26 */ 27 28 #ifndef lint 29 static const char rcsid[] = 30 "@(#) $Header: /tcpdump/master/tcpdump/print-ntp.c,v 1.27 1999/11/21 09:36:57 fenner Exp $ (LBL)"; 31 #endif 32 33 #ifdef HAVE_CONFIG_H 34 #include "config.h" 35 #endif 36 37 #include <sys/param.h> 38 #include <sys/time.h> 39 #include <sys/socket.h> 40 41 #if __STDC__ 42 struct mbuf; 43 struct rtentry; 44 #endif 45 #include <net/if.h> 46 47 #include <netinet/in.h> 48 #include <net/ethernet.h> 49 50 #include <ctype.h> 51 #include <stdio.h> 52 #include <string.h> 53 54 #include "interface.h" 55 #include "addrtoname.h" 56 #ifdef MODEMASK 57 #undef MODEMASK /* Solaris sucks */ 58 #endif 59 #include "ntp.h" 60 61 static void p_sfix(const struct s_fixedpt *); 62 static void p_ntp_time(const struct l_fixedpt *); 63 static void p_ntp_delta(const struct l_fixedpt *, const struct l_fixedpt *); 64 65 /* 66 * Print ntp requests 67 */ 68 void 69 ntp_print(register const u_char *cp, u_int length) 70 { 71 register const struct ntpdata *bp; 72 int mode, version, leapind; 73 static char rclock[5]; 74 75 bp = (struct ntpdata *)cp; 76 /* Note funny sized packets */ 77 if (length != sizeof(struct ntpdata)) 78 (void)printf(" [len=%d]", length); 79 80 TCHECK(bp->status); 81 82 version = (int)(bp->status & VERSIONMASK) >> 3; 83 printf(" v%d", version); 84 85 leapind = bp->status & LEAPMASK; 86 switch (leapind) { 87 88 case NO_WARNING: 89 break; 90 91 case PLUS_SEC: 92 fputs(" +1s", stdout); 93 break; 94 95 case MINUS_SEC: 96 fputs(" -1s", stdout); 97 break; 98 } 99 100 mode = bp->status & MODEMASK; 101 switch (mode) { 102 103 case MODE_UNSPEC: /* unspecified */ 104 fputs(" unspec", stdout); 105 break; 106 107 case MODE_SYM_ACT: /* symmetric active */ 108 fputs(" sym_act", stdout); 109 break; 110 111 case MODE_SYM_PAS: /* symmetric passive */ 112 fputs(" sym_pas", stdout); 113 break; 114 115 case MODE_CLIENT: /* client */ 116 fputs(" client", stdout); 117 break; 118 119 case MODE_SERVER: /* server */ 120 fputs(" server", stdout); 121 break; 122 123 case MODE_BROADCAST: /* broadcast */ 124 fputs(" bcast", stdout); 125 break; 126 127 case MODE_RES1: /* reserved */ 128 fputs(" res1", stdout); 129 break; 130 131 case MODE_RES2: /* reserved */ 132 fputs(" res2", stdout); 133 break; 134 135 } 136 137 TCHECK(bp->stratum); 138 printf(" strat %d", bp->stratum); 139 140 TCHECK(bp->ppoll); 141 printf(" poll %d", bp->ppoll); 142 143 /* Can't TCHECK bp->precision bitfield so bp->distance + 0 instead */ 144 TCHECK2(bp->distance, 0); 145 printf(" prec %d", bp->precision); 146 147 if (!vflag) 148 return; 149 150 TCHECK(bp->distance); 151 fputs(" dist ", stdout); 152 p_sfix(&bp->distance); 153 154 TCHECK(bp->dispersion); 155 fputs(" disp ", stdout); 156 p_sfix(&bp->dispersion); 157 158 TCHECK(bp->refid); 159 fputs(" ref ", stdout); 160 /* Interpretation depends on stratum */ 161 switch (bp->stratum) { 162 163 case UNSPECIFIED: 164 printf("(unspec)"); 165 break; 166 167 case PRIM_REF: 168 strncpy(rclock, (char *)&(bp->refid), 4); 169 rclock[4] = '\0'; 170 fputs(rclock, stdout); 171 break; 172 173 case INFO_QUERY: 174 printf("%s INFO_QUERY", ipaddr_string(&(bp->refid))); 175 /* this doesn't have more content */ 176 return; 177 178 case INFO_REPLY: 179 printf("%s INFO_REPLY", ipaddr_string(&(bp->refid))); 180 /* this is too complex to be worth printing */ 181 return; 182 183 default: 184 printf("%s", ipaddr_string(&(bp->refid))); 185 break; 186 } 187 188 TCHECK(bp->reftime); 189 putchar('@'); 190 p_ntp_time(&(bp->reftime)); 191 192 TCHECK(bp->org); 193 fputs(" orig ", stdout); 194 p_ntp_time(&(bp->org)); 195 196 TCHECK(bp->rec); 197 fputs(" rec ", stdout); 198 p_ntp_delta(&(bp->org), &(bp->rec)); 199 200 TCHECK(bp->xmt); 201 fputs(" xmt ", stdout); 202 p_ntp_delta(&(bp->org), &(bp->xmt)); 203 204 return; 205 206 trunc: 207 fputs(" [|ntp]", stdout); 208 } 209 210 static void 211 p_sfix(register const struct s_fixedpt *sfp) 212 { 213 register int i; 214 register int f; 215 register float ff; 216 217 i = ntohs(sfp->int_part); 218 f = ntohs(sfp->fraction); 219 ff = f / 65536.0; /* shift radix point by 16 bits */ 220 f = ff * 1000000.0; /* Treat fraction as parts per million */ 221 printf("%d.%06d", i, f); 222 } 223 224 #define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */ 225 226 static void 227 p_ntp_time(register const struct l_fixedpt *lfp) 228 { 229 register int32_t i; 230 register u_int32_t uf; 231 register u_int32_t f; 232 register float ff; 233 234 i = ntohl(lfp->int_part); 235 uf = ntohl(lfp->fraction); 236 ff = uf; 237 if (ff < 0.0) /* some compilers are buggy */ 238 ff += FMAXINT; 239 ff = ff / FMAXINT; /* shift radix point by 32 bits */ 240 f = ff * 1000000000.0; /* treat fraction as parts per billion */ 241 printf("%u.%09d", i, f); 242 } 243 244 /* Prints time difference between *lfp and *olfp */ 245 static void 246 p_ntp_delta(register const struct l_fixedpt *olfp, 247 register const struct l_fixedpt *lfp) 248 { 249 register int32_t i; 250 register u_int32_t uf; 251 register u_int32_t ouf; 252 register u_int32_t f; 253 register float ff; 254 int signbit; 255 256 i = ntohl(lfp->int_part) - ntohl(olfp->int_part); 257 258 uf = ntohl(lfp->fraction); 259 ouf = ntohl(olfp->fraction); 260 261 if (i > 0) { /* new is definitely greater than old */ 262 signbit = 0; 263 f = uf - ouf; 264 if (ouf > uf) /* must borrow from high-order bits */ 265 i -= 1; 266 } else if (i < 0) { /* new is definitely less than old */ 267 signbit = 1; 268 f = ouf - uf; 269 if (uf > ouf) /* must carry into the high-order bits */ 270 i += 1; 271 i = -i; 272 } else { /* int_part is zero */ 273 if (uf > ouf) { 274 signbit = 0; 275 f = uf - ouf; 276 } else { 277 signbit = 1; 278 f = ouf - uf; 279 } 280 } 281 282 ff = f; 283 if (ff < 0.0) /* some compilers are buggy */ 284 ff += FMAXINT; 285 ff = ff / FMAXINT; /* shift radix point by 32 bits */ 286 f = ff * 1000000000.0; /* treat fraction as parts per billion */ 287 if (signbit) 288 putchar('-'); 289 else 290 putchar('+'); 291 printf("%d.%09d", i, f); 292 } 293