contrib/tcpdump/print-domain.c

   1 /*
   2  * Copyright (c) 1988, 1989, 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  * $FreeBSD$
  22  */
  23
  24 #define NETDISSECT_REWORKED
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <tcpdump-stdinc.h>
  30
  31 #include "nameser.h"
  32
  33 #include <string.h>
  34
  35 #include "interface.h"
  36 #include "addrtoname.h"
  37 #include "extract.h"                    /* must come after interface.h */
  38
  39 static const char *ns_ops[] = {
  40         "", " inv_q", " stat", " op3", " notify", " update", " op6", " op7",
  41         " op8", " updateA", " updateD", " updateDA",
  42         " updateM", " updateMA", " zoneInit", " zoneRef",
  43 };
  44
  45 static const char *ns_resp[] = {
  46         "", " FormErr", " ServFail", " NXDomain",
  47         " NotImp", " Refused", " YXDomain", " YXRRSet",
  48         " NXRRSet", " NotAuth", " NotZone", " Resp11",
  49         " Resp12", " Resp13", " Resp14", " NoChange",
  50 };
  51
  52 /* skip over a domain name */
  53 static const u_char *
  54 ns_nskip(netdissect_options *ndo,
  55          register const u_char *cp)
  56 {
  57         register u_char i;
  58
  59         if (!ND_TTEST2(*cp, 1))
  60                 return (NULL);
  61         i = *cp++;
  62         while (i) {
  63                 if ((i & INDIR_MASK) == INDIR_MASK)
  64                         return (cp + 1);
  65                 if ((i & INDIR_MASK) == EDNS0_MASK) {
  66                         int bitlen, bytelen;
  67
  68                         if ((i & ~INDIR_MASK) != EDNS0_ELT_BITLABEL)
  69                                 return(NULL); /* unknown ELT */
  70                         if (!ND_TTEST2(*cp, 1))
  71                                 return (NULL);
  72                         if ((bitlen = *cp++) == 0)
  73                                 bitlen = 256;
  74                         bytelen = (bitlen + 7) / 8;
  75                         cp += bytelen;
  76                 } else
  77                         cp += i;
  78                 if (!ND_TTEST2(*cp, 1))
  79                         return (NULL);
  80                 i = *cp++;
  81         }
  82         return (cp);
  83 }
  84
  85 /* print a <domain-name> */
  86 static const u_char *
  87 blabel_print(netdissect_options *ndo,
  88              const u_char *cp)
  89 {
  90         int bitlen, slen, b;
  91         const u_char *bitp, *lim;
  92         char tc;
  93
  94         if (!ND_TTEST2(*cp, 1))
  95                 return(NULL);
  96         if ((bitlen = *cp) == 0)
  97                 bitlen = 256;
  98         slen = (bitlen + 3) / 4;
  99         lim = cp + 1 + slen;
 100
 101         /* print the bit string as a hex string */
 102         ND_PRINT((ndo, "\\[x"));
 103         for (bitp = cp + 1, b = bitlen; bitp < lim && b > 7; b -= 8, bitp++) {
 104                 ND_TCHECK(*bitp);
 105                 ND_PRINT((ndo, "%02x", *bitp));
 106         }
 107         if (b > 4) {
 108                 ND_TCHECK(*bitp);
 109                 tc = *bitp++;
 110                 ND_PRINT((ndo, "%02x", tc & (0xff << (8 - b))));
 111         } else if (b > 0) {
 112                 ND_TCHECK(*bitp);
 113                 tc = *bitp++;
 114                 ND_PRINT((ndo, "%1x", ((tc >> 4) & 0x0f) & (0x0f << (4 - b))));
 115         }
 116         ND_PRINT((ndo, "/%d]", bitlen));
 117         return lim;
 118 trunc:
 119         ND_PRINT((ndo, ".../%d]", bitlen));
 120         return NULL;
 121 }
 122
 123 static int
 124 labellen(netdissect_options *ndo,
 125          const u_char *cp)
 126 {
 127         register u_int i;
 128
 129         if (!ND_TTEST2(*cp, 1))
 130                 return(-1);
 131         i = *cp;
 132         if ((i & INDIR_MASK) == EDNS0_MASK) {
 133                 int bitlen, elt;
 134                 if ((elt = (i & ~INDIR_MASK)) != EDNS0_ELT_BITLABEL) {
 135                         ND_PRINT((ndo, "<ELT %d>", elt));
 136                         return(-1);
 137                 }
 138                 if (!ND_TTEST2(*(cp + 1), 1))
 139                         return(-1);
 140                 if ((bitlen = *(cp + 1)) == 0)
 141                         bitlen = 256;
 142                 return(((bitlen + 7) / 8) + 1);
 143         } else
 144                 return(i);
 145 }
 146
 147 const u_char *
 148 ns_nprint(netdissect_options *ndo,
 149           register const u_char *cp, register const u_char *bp)
 150 {
 151         register u_int i, l;
 152         register const u_char *rp = NULL;
 153         register int compress = 0;
 154         int chars_processed;
 155         int elt;
 156         int data_size = ndo->ndo_snapend - bp;
 157
 158         if ((l = labellen(ndo, cp)) == (u_int)-1)
 159                 return(NULL);
 160         if (!ND_TTEST2(*cp, 1))
 161                 return(NULL);
 162         chars_processed = 1;
 163         if (((i = *cp++) & INDIR_MASK) != INDIR_MASK) {
 164                 compress = 0;
 165                 rp = cp + l;
 166         }
 167
 168         if (i != 0)
 169                 while (i && cp < ndo->ndo_snapend) {
 170                         if ((i & INDIR_MASK) == INDIR_MASK) {
 171                                 if (!compress) {
 172                                         rp = cp + 1;
 173                                         compress = 1;
 174                                 }
 175                                 if (!ND_TTEST2(*cp, 1))
 176                                         return(NULL);
 177                                 cp = bp + (((i << 8) | *cp) & 0x3fff);
 178                                 if ((l = labellen(ndo, cp)) == (u_int)-1)
 179                                         return(NULL);
 180                                 if (!ND_TTEST2(*cp, 1))
 181                                         return(NULL);
 182                                 i = *cp++;
 183                                 chars_processed++;
 184
 185                                 /*
 186                                  * If we've looked at every character in
 187                                  * the message, this pointer will make
 188                                  * us look at some character again,
 189                                  * which means we're looping.
 190                                  */
 191                                 if (chars_processed >= data_size) {
 192                                         ND_PRINT((ndo, "<LOOP>"));
 193                                         return (NULL);
 194                                 }
 195                                 continue;
 196                         }
 197                         if ((i & INDIR_MASK) == EDNS0_MASK) {
 198                                 elt = (i & ~INDIR_MASK);
 199                                 switch(elt) {
 200                                 case EDNS0_ELT_BITLABEL:
 201                                         if (blabel_print(ndo, cp) == NULL)
 202                                                 return (NULL);
 203                                         break;
 204                                 default:
 205                                         /* unknown ELT */
 206                                         ND_PRINT((ndo, "<ELT %d>", elt));
 207                                         return(NULL);
 208                                 }
 209                         } else {
 210                                 if (fn_printn(ndo, cp, l, ndo->ndo_snapend))
 211                                         return(NULL);
 212                         }
 213
 214                         cp += l;
 215                         chars_processed += l;
 216                         ND_PRINT((ndo, "."));
 217                         if ((l = labellen(ndo, cp)) == (u_int)-1)
 218                                 return(NULL);
 219                         if (!ND_TTEST2(*cp, 1))
 220                                 return(NULL);
 221                         i = *cp++;
 222                         chars_processed++;
 223                         if (!compress)
 224                                 rp += l + 1;
 225                 }
 226         else
 227                 ND_PRINT((ndo, "."));
 228         return (rp);
 229 }
 230
 231 /* print a <character-string> */
 232 static const u_char *
 233 ns_cprint(netdissect_options *ndo,
 234           register const u_char *cp)
 235 {
 236         register u_int i;
 237
 238         if (!ND_TTEST2(*cp, 1))
 239                 return (NULL);
 240         i = *cp++;
 241         if (fn_printn(ndo, cp, i, ndo->ndo_snapend))
 242                 return (NULL);
 243         return (cp + i);
 244 }
 245
 246 /* http://www.iana.org/assignments/dns-parameters */
 247 const struct tok ns_type2str[] = {
 248         { T_A,          "A" },                  /* RFC 1035 */
 249         { T_NS,         "NS" },                 /* RFC 1035 */
 250         { T_MD,         "MD" },                 /* RFC 1035 */
 251         { T_MF,         "MF" },                 /* RFC 1035 */
 252         { T_CNAME,      "CNAME" },              /* RFC 1035 */
 253         { T_SOA,        "SOA" },                /* RFC 1035 */
 254         { T_MB,         "MB" },                 /* RFC 1035 */
 255         { T_MG,         "MG" },                 /* RFC 1035 */
 256         { T_MR,         "MR" },                 /* RFC 1035 */
 257         { T_NULL,       "NULL" },               /* RFC 1035 */
 258         { T_WKS,        "WKS" },                /* RFC 1035 */
 259         { T_PTR,        "PTR" },                /* RFC 1035 */
 260         { T_HINFO,      "HINFO" },              /* RFC 1035 */
 261         { T_MINFO,      "MINFO" },              /* RFC 1035 */
 262         { T_MX,         "MX" },                 /* RFC 1035 */
 263         { T_TXT,        "TXT" },                /* RFC 1035 */
 264         { T_RP,         "RP" },                 /* RFC 1183 */
 265         { T_AFSDB,      "AFSDB" },              /* RFC 1183 */
 266         { T_X25,        "X25" },                /* RFC 1183 */
 267         { T_ISDN,       "ISDN" },               /* RFC 1183 */
 268         { T_RT,         "RT" },                 /* RFC 1183 */
 269         { T_NSAP,       "NSAP" },               /* RFC 1706 */
 270         { T_NSAP_PTR,   "NSAP_PTR" },
 271         { T_SIG,        "SIG" },                /* RFC 2535 */
 272         { T_KEY,        "KEY" },                /* RFC 2535 */
 273         { T_PX,         "PX" },                 /* RFC 2163 */
 274         { T_GPOS,       "GPOS" },               /* RFC 1712 */
 275         { T_AAAA,       "AAAA" },               /* RFC 1886 */
 276         { T_LOC,        "LOC" },                /* RFC 1876 */
 277         { T_NXT,        "NXT" },                /* RFC 2535 */
 278         { T_EID,        "EID" },                /* Nimrod */
 279         { T_NIMLOC,     "NIMLOC" },             /* Nimrod */
 280         { T_SRV,        "SRV" },                /* RFC 2782 */
 281         { T_ATMA,       "ATMA" },               /* ATM Forum */
 282         { T_NAPTR,      "NAPTR" },              /* RFC 2168, RFC 2915 */
 283         { T_KX,         "KX" },                 /* RFC 2230 */
 284         { T_CERT,       "CERT" },               /* RFC 2538 */
 285         { T_A6,         "A6" },                 /* RFC 2874 */
 286         { T_DNAME,      "DNAME" },              /* RFC 2672 */
 287         { T_SINK,       "SINK" },
 288         { T_OPT,        "OPT" },                /* RFC 2671 */
 289         { T_APL,        "APL" },                /* RFC 3123 */
 290         { T_DS,         "DS" },                 /* RFC 4034 */
 291         { T_SSHFP,      "SSHFP" },              /* RFC 4255 */
 292         { T_IPSECKEY,   "IPSECKEY" },           /* RFC 4025 */
 293         { T_RRSIG,      "RRSIG" },              /* RFC 4034 */
 294         { T_NSEC,       "NSEC" },               /* RFC 4034 */
 295         { T_DNSKEY,     "DNSKEY" },             /* RFC 4034 */
 296         { T_SPF,        "SPF" },                /* RFC-schlitt-spf-classic-02.txt */
 297         { T_UINFO,      "UINFO" },
 298         { T_UID,        "UID" },
 299         { T_GID,        "GID" },
 300         { T_UNSPEC,     "UNSPEC" },
 301         { T_UNSPECA,    "UNSPECA" },
 302         { T_TKEY,       "TKEY" },               /* RFC 2930 */
 303         { T_TSIG,       "TSIG" },               /* RFC 2845 */
 304         { T_IXFR,       "IXFR" },               /* RFC 1995 */
 305         { T_AXFR,       "AXFR" },               /* RFC 1035 */
 306         { T_MAILB,      "MAILB" },              /* RFC 1035 */
 307         { T_MAILA,      "MAILA" },              /* RFC 1035 */
 308         { T_ANY,        "ANY" },
 309         { 0,            NULL }
 310 };
 311
 312 const struct tok ns_class2str[] = {
 313         { C_IN,         "IN" },         /* Not used */
 314         { C_CHAOS,      "CHAOS" },
 315         { C_HS,         "HS" },
 316         { C_ANY,        "ANY" },
 317         { 0,            NULL }
 318 };
 319
 320 /* print a query */
 321 static const u_char *
 322 ns_qprint(netdissect_options *ndo,
 323           register const u_char *cp, register const u_char *bp, int is_mdns)
 324 {
 325         register const u_char *np = cp;
 326         register u_int i, class;
 327
 328         cp = ns_nskip(ndo, cp);
 329
 330         if (cp == NULL || !ND_TTEST2(*cp, 4))
 331                 return(NULL);
 332
 333         /* print the qtype */
 334         i = EXTRACT_16BITS(cp);
 335         cp += 2;
 336         ND_PRINT((ndo, " %s", tok2str(ns_type2str, "Type%d", i)));
 337         /* print the qclass (if it's not IN) */
 338         i = EXTRACT_16BITS(cp);
 339         cp += 2;
 340         if (is_mdns)
 341                 class = (i & ~C_QU);
 342         else
 343                 class = i;
 344         if (class != C_IN)
 345                 ND_PRINT((ndo, " %s", tok2str(ns_class2str, "(Class %d)", class)));
 346         if (is_mdns) {
 347                 ND_PRINT((ndo, i & C_QU ? " (QU)" : " (QM)"));
 348         }
 349
 350         ND_PRINT((ndo, "? "));
 351         cp = ns_nprint(ndo, np, bp);
 352         return(cp ? cp + 4 : NULL);
 353 }
 354
 355 /* print a reply */
 356 static const u_char *
 357 ns_rprint(netdissect_options *ndo,
 358           register const u_char *cp, register const u_char *bp, int is_mdns)
 359 {
 360         register u_int i, class, opt_flags = 0;
 361         register u_short typ, len;
 362         register const u_char *rp;
 363
 364         if (ndo->ndo_vflag) {
 365                 ND_PRINT((ndo, " "));
 366                 if ((cp = ns_nprint(ndo, cp, bp)) == NULL)
 367                         return NULL;
 368         } else
 369                 cp = ns_nskip(ndo, cp);
 370
 371         if (cp == NULL || !ND_TTEST2(*cp, 10))
 372                 return (ndo->ndo_snapend);
 373
 374         /* print the type/qtype */
 375         typ = EXTRACT_16BITS(cp);
 376         cp += 2;
 377         /* print the class (if it's not IN and the type isn't OPT) */
 378         i = EXTRACT_16BITS(cp);
 379         cp += 2;
 380         if (is_mdns)
 381                 class = (i & ~C_CACHE_FLUSH);
 382         else
 383                 class = i;
 384         if (class != C_IN && typ != T_OPT)
 385                 ND_PRINT((ndo, " %s", tok2str(ns_class2str, "(Class %d)", class)));
 386         if (is_mdns) {
 387                 if (i & C_CACHE_FLUSH)
 388                         ND_PRINT((ndo, " (Cache flush)"));
 389         }
 390
 391         if (typ == T_OPT) {
 392                 /* get opt flags */
 393                 cp += 2;
 394                 opt_flags = EXTRACT_16BITS(cp);
 395                 /* ignore rest of ttl field */
 396                 cp += 2;
 397         } else if (ndo->ndo_vflag > 2) {
 398                 /* print ttl */
 399                 ND_PRINT((ndo, " ["));
 400                 relts_print(ndo, EXTRACT_32BITS(cp));
 401                 ND_PRINT((ndo, "]"));
 402                 cp += 4;
 403         } else {
 404                 /* ignore ttl */
 405                 cp += 4;
 406         }
 407
 408         len = EXTRACT_16BITS(cp);
 409         cp += 2;
 410
 411         rp = cp + len;
 412
 413         ND_PRINT((ndo, " %s", tok2str(ns_type2str, "Type%d", typ)));
 414         if (rp > ndo->ndo_snapend)
 415                 return(NULL);
 416
 417         switch (typ) {
 418         case T_A:
 419                 if (!ND_TTEST2(*cp, sizeof(struct in_addr)))
 420                         return(NULL);
 421                 ND_PRINT((ndo, " %s", intoa(htonl(EXTRACT_32BITS(cp)))));
 422                 break;
 423
 424         case T_NS:
 425         case T_CNAME:
 426         case T_PTR:
 427 #ifdef T_DNAME
 428         case T_DNAME:
 429 #endif
 430                 ND_PRINT((ndo, " "));
 431                 if (ns_nprint(ndo, cp, bp) == NULL)
 432                         return(NULL);
 433                 break;
 434
 435         case T_SOA:
 436                 if (!ndo->ndo_vflag)
 437                         break;
 438                 ND_PRINT((ndo, " "));
 439                 if ((cp = ns_nprint(ndo, cp, bp)) == NULL)
 440                         return(NULL);
 441                 ND_PRINT((ndo, " "));
 442                 if ((cp = ns_nprint(ndo, cp, bp)) == NULL)
 443                         return(NULL);
 444                 if (!ND_TTEST2(*cp, 5 * 4))
 445                         return(NULL);
 446                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
 447                 cp += 4;
 448                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
 449                 cp += 4;
 450                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
 451                 cp += 4;
 452                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
 453                 cp += 4;
 454                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp)));
 455                 cp += 4;
 456                 break;
 457         case T_MX:
 458                 ND_PRINT((ndo, " "));
 459                 if (!ND_TTEST2(*cp, 2))
 460                         return(NULL);
 461                 if (ns_nprint(ndo, cp + 2, bp) == NULL)
 462                         return(NULL);
 463                 ND_PRINT((ndo, " %d", EXTRACT_16BITS(cp)));
 464                 break;
 465
 466         case T_TXT:
 467                 while (cp < rp) {
 468                         ND_PRINT((ndo, " \""));
 469                         cp = ns_cprint(ndo, cp);
 470                         if (cp == NULL)
 471                                 return(NULL);
 472                         ND_PRINT((ndo, "\""));
 473                 }
 474                 break;
 475
 476         case T_SRV:
 477                 ND_PRINT((ndo, " "));
 478                 if (!ND_TTEST2(*cp, 6))
 479                         return(NULL);
 480                 if (ns_nprint(ndo, cp + 6, bp) == NULL)
 481                         return(NULL);
 482                 ND_PRINT((ndo, ":%d %d %d", EXTRACT_16BITS(cp + 4),
 483                         EXTRACT_16BITS(cp), EXTRACT_16BITS(cp + 2)));
 484                 break;
 485
 486 #ifdef INET6
 487         case T_AAAA:
 488             {
 489                 struct in6_addr addr;
 490                 char ntop_buf[INET6_ADDRSTRLEN];
 491
 492                 if (!ND_TTEST2(*cp, sizeof(struct in6_addr)))
 493                         return(NULL);
 494                 memcpy(&addr, cp, sizeof(struct in6_addr));
 495                 ND_PRINT((ndo, " %s",
 496                     inet_ntop(AF_INET6, &addr, ntop_buf, sizeof(ntop_buf))));
 497
 498                 break;
 499             }
 500
 501         case T_A6:
 502             {
 503                 struct in6_addr a;
 504                 int pbit, pbyte;
 505                 char ntop_buf[INET6_ADDRSTRLEN];
 506
 507                 if (!ND_TTEST2(*cp, 1))
 508                         return(NULL);
 509                 pbit = *cp;
 510                 pbyte = (pbit & ~7) / 8;
 511                 if (pbit > 128) {
 512                         ND_PRINT((ndo, " %u(bad plen)", pbit));
 513                         break;
 514                 } else if (pbit < 128) {
 515                         if (!ND_TTEST2(*(cp + 1), sizeof(a) - pbyte))
 516                                 return(NULL);
 517                         memset(&a, 0, sizeof(a));
 518                         memcpy(&a.s6_addr[pbyte], cp + 1, sizeof(a) - pbyte);
 519                         ND_PRINT((ndo, " %u %s", pbit,
 520                             inet_ntop(AF_INET6, &a, ntop_buf, sizeof(ntop_buf))));
 521                 }
 522                 if (pbit > 0) {
 523                         ND_PRINT((ndo, " "));
 524                         if (ns_nprint(ndo, cp + 1 + sizeof(a) - pbyte, bp) == NULL)
 525                                 return(NULL);
 526                 }
 527                 break;
 528             }
 529 #endif /*INET6*/
 530
 531         case T_OPT:
 532                 ND_PRINT((ndo, " UDPsize=%u", class));
 533                 if (opt_flags & 0x8000)
 534                         ND_PRINT((ndo, " OK"));
 535                 break;
 536
 537         case T_UNSPECA:         /* One long string */
 538                 if (!ND_TTEST2(*cp, len))
 539                         return(NULL);
 540                 if (fn_printn(ndo, cp, len, ndo->ndo_snapend))
 541                         return(NULL);
 542                 break;
 543
 544         case T_TSIG:
 545             {
 546                 if (cp + len > ndo->ndo_snapend)
 547                         return(NULL);
 548                 if (!ndo->ndo_vflag)
 549                         break;
 550                 ND_PRINT((ndo, " "));
 551                 if ((cp = ns_nprint(ndo, cp, bp)) == NULL)
 552                         return(NULL);
 553                 cp += 6;
 554                 if (!ND_TTEST2(*cp, 2))
 555                         return(NULL);
 556                 ND_PRINT((ndo, " fudge=%u", EXTRACT_16BITS(cp)));
 557                 cp += 2;
 558                 if (!ND_TTEST2(*cp, 2))
 559                         return(NULL);
 560                 ND_PRINT((ndo, " maclen=%u", EXTRACT_16BITS(cp)));
 561                 cp += 2 + EXTRACT_16BITS(cp);
 562                 if (!ND_TTEST2(*cp, 2))
 563                         return(NULL);
 564                 ND_PRINT((ndo, " origid=%u", EXTRACT_16BITS(cp)));
 565                 cp += 2;
 566                 if (!ND_TTEST2(*cp, 2))
 567                         return(NULL);
 568                 ND_PRINT((ndo, " error=%u", EXTRACT_16BITS(cp)));
 569                 cp += 2;
 570                 if (!ND_TTEST2(*cp, 2))
 571                         return(NULL);
 572                 ND_PRINT((ndo, " otherlen=%u", EXTRACT_16BITS(cp)));
 573                 cp += 2;
 574             }
 575         }
 576         return (rp);            /* XXX This isn't always right */
 577 }
 578
 579 void
 580 ns_print(netdissect_options *ndo,
 581          register const u_char *bp, u_int length, int is_mdns)
 582 {
 583         register const HEADER *np;
 584         register int qdcount, ancount, nscount, arcount;
 585         register const u_char *cp;
 586         uint16_t b2;
 587
 588         np = (const HEADER *)bp;
 589         ND_TCHECK(*np);
 590         /* get the byte-order right */
 591         qdcount = EXTRACT_16BITS(&np->qdcount);
 592         ancount = EXTRACT_16BITS(&np->ancount);
 593         nscount = EXTRACT_16BITS(&np->nscount);
 594         arcount = EXTRACT_16BITS(&np->arcount);
 595
 596         if (DNS_QR(np)) {
 597                 /* this is a response */
 598                 ND_PRINT((ndo, "%d%s%s%s%s%s%s",
 599                         EXTRACT_16BITS(&np->id),
 600                         ns_ops[DNS_OPCODE(np)],
 601                         ns_resp[DNS_RCODE(np)],
 602                         DNS_AA(np)? "*" : "",
 603                         DNS_RA(np)? "" : "-",
 604                         DNS_TC(np)? "|" : "",
 605                         DNS_AD(np)? "$" : ""));
 606
 607                 if (qdcount != 1)
 608                         ND_PRINT((ndo, " [%dq]", qdcount));
 609                 /* Print QUESTION section on -vv */
 610                 cp = (const u_char *)(np + 1);
 611                 while (qdcount--) {
 612                         if (qdcount < EXTRACT_16BITS(&np->qdcount) - 1)
 613                                 ND_PRINT((ndo, ","));
 614                         if (ndo->ndo_vflag > 1) {
 615                                 ND_PRINT((ndo, " q:"));
 616                                 if ((cp = ns_qprint(ndo, cp, bp, is_mdns)) == NULL)
 617                                         goto trunc;
 618                         } else {
 619                                 if ((cp = ns_nskip(ndo, cp)) == NULL)
 620                                         goto trunc;
 621                                 cp += 4;        /* skip QTYPE and QCLASS */
 622                         }
 623                 }
 624                 ND_PRINT((ndo, " %d/%d/%d", ancount, nscount, arcount));
 625                 if (ancount--) {
 626                         if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
 627                                 goto trunc;
 628                         while (cp < ndo->ndo_snapend && ancount--) {
 629                                 ND_PRINT((ndo, ","));
 630                                 if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
 631                                         goto trunc;
 632                         }
 633                 }
 634                 if (ancount > 0)
 635                         goto trunc;
 636                 /* Print NS and AR sections on -vv */
 637                 if (ndo->ndo_vflag > 1) {
 638                         if (cp < ndo->ndo_snapend && nscount--) {
 639                                 ND_PRINT((ndo, " ns:"));
 640                                 if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
 641                                         goto trunc;
 642                                 while (cp < ndo->ndo_snapend && nscount--) {
 643                                         ND_PRINT((ndo, ","));
 644                                         if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
 645                                                 goto trunc;
 646                                 }
 647                         }
 648                         if (nscount > 0)
 649                                 goto trunc;
 650                         if (cp < ndo->ndo_snapend && arcount--) {
 651                                 ND_PRINT((ndo, " ar:"));
 652                                 if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
 653                                         goto trunc;
 654                                 while (cp < ndo->ndo_snapend && arcount--) {
 655                                         ND_PRINT((ndo, ","));
 656                                         if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
 657                                                 goto trunc;
 658                                 }
 659                         }
 660                         if (arcount > 0)
 661                                 goto trunc;
 662                 }
 663         }
 664         else {
 665                 /* this is a request */
 666                 ND_PRINT((ndo, "%d%s%s%s", EXTRACT_16BITS(&np->id), ns_ops[DNS_OPCODE(np)],
 667                     DNS_RD(np) ? "+" : "",
 668                     DNS_CD(np) ? "%" : ""));
 669
 670                 /* any weirdness? */
 671                 b2 = EXTRACT_16BITS(((u_short *)np)+1);
 672                 if (b2 & 0x6cf)
 673                         ND_PRINT((ndo, " [b2&3=0x%x]", b2));
 674
 675                 if (DNS_OPCODE(np) == IQUERY) {
 676                         if (qdcount)
 677                                 ND_PRINT((ndo, " [%dq]", qdcount));
 678                         if (ancount != 1)
 679                                 ND_PRINT((ndo, " [%da]", ancount));
 680                 }
 681                 else {
 682                         if (ancount)
 683                                 ND_PRINT((ndo, " [%da]", ancount));
 684                         if (qdcount != 1)
 685                                 ND_PRINT((ndo, " [%dq]", qdcount));
 686                 }
 687                 if (nscount)
 688                         ND_PRINT((ndo, " [%dn]", nscount));
 689                 if (arcount)
 690                         ND_PRINT((ndo, " [%dau]", arcount));
 691
 692                 cp = (const u_char *)(np + 1);
 693                 if (qdcount--) {
 694                         cp = ns_qprint(ndo, cp, (const u_char *)np, is_mdns);
 695                         if (!cp)
 696                                 goto trunc;
 697                         while (cp < ndo->ndo_snapend && qdcount--) {
 698                                 cp = ns_qprint(ndo, (const u_char *)cp,
 699                                                (const u_char *)np,
 700                                                is_mdns);
 701                                 if (!cp)
 702                                         goto trunc;
 703                         }
 704                 }
 705                 if (qdcount > 0)
 706                         goto trunc;
 707
 708                 /* Print remaining sections on -vv */
 709                 if (ndo->ndo_vflag > 1) {
 710                         if (ancount--) {
 711                                 if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
 712                                         goto trunc;
 713                                 while (cp < ndo->ndo_snapend && ancount--) {
 714                                         ND_PRINT((ndo, ","));
 715                                         if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
 716                                                 goto trunc;
 717                                 }
 718                         }
 719                         if (ancount > 0)
 720                                 goto trunc;
 721                         if (cp < ndo->ndo_snapend && nscount--) {
 722                                 ND_PRINT((ndo, " ns:"));
 723                                 if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
 724                                         goto trunc;
 725                                 while (nscount-- && cp < ndo->ndo_snapend) {
 726                                         ND_PRINT((ndo, ","));
 727                                         if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
 728                                                 goto trunc;
 729                                 }
 730                         }
 731                         if (nscount > 0)
 732                                 goto trunc;
 733                         if (cp < ndo->ndo_snapend && arcount--) {
 734                                 ND_PRINT((ndo, " ar:"));
 735                                 if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
 736                                         goto trunc;
 737                                 while (cp < ndo->ndo_snapend && arcount--) {
 738                                         ND_PRINT((ndo, ","));
 739                                         if ((cp = ns_rprint(ndo, cp, bp, is_mdns)) == NULL)
 740                                                 goto trunc;
 741                                 }
 742                         }
 743                         if (arcount > 0)
 744                                 goto trunc;
 745                 }
 746         }
 747         ND_PRINT((ndo, " (%d)", length));
 748         return;
 749
 750   trunc:
 751         ND_PRINT((ndo, "[|domain]"));
 752 }