1 /* 2 * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996 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 char rcsid[] = 28 "@(#) $Header: print-ntp.c,v 1.23 96/07/23 14:17:26 leres Exp $ (LBL)"; 29 #endif 30 31 #include <sys/param.h> 32 #include <sys/time.h> 33 #include <sys/socket.h> 34 35 #if __STDC__ 36 struct mbuf; 37 struct rtentry; 38 #endif 39 #include <net/if.h> 40 41 #include <netinet/in.h> 42 #include <netinet/if_ether.h> 43 44 #include <ctype.h> 45 #include <stdio.h> 46 #include <string.h> 47 48 #include "interface.h" 49 #include "addrtoname.h" 50 #undef MODEMASK /* Solaris sucks */ 51 #include "ntp.h" 52 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 *); 56 57 /* 58 * Print ntp requests 59 */ 60 void 61 ntp_print(register const u_char *cp, u_int length) 62 { 63 register const struct ntpdata *bp; 64 int mode, version, leapind; 65 static char rclock[5]; 66 67 bp = (struct ntpdata *)cp; 68 /* Note funny sized packets */ 69 if (length != sizeof(struct ntpdata)) 70 (void)printf(" [len=%d]", length); 71 72 TCHECK(bp->status); 73 74 version = (bp->status & VERSIONMASK) >> 3; 75 printf(" v%d", version); 76 77 leapind = bp->status & LEAPMASK; 78 switch (leapind) { 79 80 case NO_WARNING: 81 break; 82 83 case PLUS_SEC: 84 fputs(" +1s", stdout); 85 break; 86 87 case MINUS_SEC: 88 fputs(" -1s", stdout); 89 break; 90 } 91 92 mode = bp->status & MODEMASK; 93 switch (mode) { 94 95 case MODE_UNSPEC: /* unspecified */ 96 fputs(" unspec", stdout); 97 break; 98 99 case MODE_SYM_ACT: /* symmetric active */ 100 fputs(" sym_act", stdout); 101 break; 102 103 case MODE_SYM_PAS: /* symmetric passive */ 104 fputs(" sym_pas", stdout); 105 break; 106 107 case MODE_CLIENT: /* client */ 108 fputs(" client", stdout); 109 break; 110 111 case MODE_SERVER: /* server */ 112 fputs(" server", stdout); 113 break; 114 115 case MODE_BROADCAST: /* broadcast */ 116 fputs(" bcast", stdout); 117 break; 118 119 case MODE_RES1: /* reserved */ 120 fputs(" res1", stdout); 121 break; 122 123 case MODE_RES2: /* reserved */ 124 fputs(" res2", stdout); 125 break; 126 127 } 128 129 TCHECK(bp->stratum); 130 printf(" strat %d", bp->stratum); 131 132 TCHECK(bp->ppoll); 133 printf(" poll %d", bp->ppoll); 134 135 /* Can't TCHECK bp->precision bitfield so bp->distance + 0 instead */ 136 TCHECK2(bp->distance, 0); 137 printf(" prec %d", bp->precision); 138 139 if (!vflag) 140 return; 141 142 TCHECK(bp->distance); 143 fputs(" dist ", stdout); 144 p_sfix(&bp->distance); 145 146 TCHECK(bp->dispersion); 147 fputs(" disp ", stdout); 148 p_sfix(&bp->dispersion); 149 150 TCHECK(bp->refid); 151 fputs(" ref ", stdout); 152 /* Interpretation depends on stratum */ 153 switch (bp->stratum) { 154 155 case UNSPECIFIED: 156 printf("(unspec)"); 157 break; 158 159 case PRIM_REF: 160 strncpy(rclock, (char *)&(bp->refid), 4); 161 rclock[4] = '\0'; 162 fputs(rclock, stdout); 163 break; 164 165 case INFO_QUERY: 166 printf("%s INFO_QUERY", ipaddr_string(&(bp->refid))); 167 /* this doesn't have more content */ 168 return; 169 170 case INFO_REPLY: 171 printf("%s INFO_REPLY", ipaddr_string(&(bp->refid))); 172 /* this is too complex to be worth printing */ 173 return; 174 175 default: 176 printf("%s", ipaddr_string(&(bp->refid))); 177 break; 178 } 179 180 TCHECK(bp->reftime); 181 putchar('@'); 182 p_ntp_time(&(bp->reftime)); 183 184 TCHECK(bp->org); 185 fputs(" orig ", stdout); 186 p_ntp_time(&(bp->org)); 187 188 TCHECK(bp->rec); 189 fputs(" rec ", stdout); 190 p_ntp_delta(&(bp->org), &(bp->rec)); 191 192 TCHECK(bp->xmt); 193 fputs(" xmt ", stdout); 194 p_ntp_delta(&(bp->org), &(bp->xmt)); 195 196 return; 197 198 trunc: 199 fputs(" [|ntp]", stdout); 200 } 201 202 static void 203 p_sfix(register const struct s_fixedpt *sfp) 204 { 205 register int i; 206 register int f; 207 register float ff; 208 209 i = ntohs(sfp->int_part); 210 f = ntohs(sfp->fraction); 211 ff = f / 65536.0; /* shift radix point by 16 bits */ 212 f = ff * 1000000.0; /* Treat fraction as parts per million */ 213 printf("%d.%06d", i, f); 214 } 215 216 #define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */ 217 218 static void 219 p_ntp_time(register const struct l_fixedpt *lfp) 220 { 221 register int32_t i; 222 register u_int32_t uf; 223 register u_int32_t f; 224 register float ff; 225 226 i = ntohl(lfp->int_part); 227 uf = ntohl(lfp->fraction); 228 ff = uf; 229 if (ff < 0.0) /* some compilers are buggy */ 230 ff += FMAXINT; 231 ff = ff / FMAXINT; /* shift radix point by 32 bits */ 232 f = ff * 1000000000.0; /* treat fraction as parts per billion */ 233 printf("%u.%09d", i, f); 234 } 235 236 /* Prints time difference between *lfp and *olfp */ 237 static void 238 p_ntp_delta(register const struct l_fixedpt *olfp, 239 register const struct l_fixedpt *lfp) 240 { 241 register int32_t i; 242 register u_int32_t uf; 243 register u_int32_t ouf; 244 register u_int32_t f; 245 register float ff; 246 int signbit; 247 248 i = ntohl(lfp->int_part) - ntohl(olfp->int_part); 249 250 uf = ntohl(lfp->fraction); 251 ouf = ntohl(olfp->fraction); 252 253 if (i > 0) { /* new is definitely greater than old */ 254 signbit = 0; 255 f = uf - ouf; 256 if (ouf > uf) /* must borrow from high-order bits */ 257 i -= 1; 258 } else if (i < 0) { /* new is definitely less than old */ 259 signbit = 1; 260 f = ouf - uf; 261 if (uf > ouf) /* must carry into the high-order bits */ 262 i += 1; 263 i = -i; 264 } else { /* int_part is zero */ 265 if (uf > ouf) { 266 signbit = 0; 267 f = uf - ouf; 268 } else { 269 signbit = 1; 270 f = ouf - uf; 271 } 272 } 273 274 ff = f; 275 if (ff < 0.0) /* some compilers are buggy */ 276 ff += FMAXINT; 277 ff = ff / FMAXINT; /* shift radix point by 32 bits */ 278 f = ff * 1000000000.0; /* treat fraction as parts per billion */ 279 if (signbit) 280 putchar('-'); 281 else 282 putchar('+'); 283 printf("%d.%09d", i, f); 284 } 285