lib/libc/nameser/ns_print.c

   1 /*
   2  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (c) 1996-1999 by Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  15  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #ifndef lint
  19 static const char rcsid[] = "$Id: ns_print.c,v 1.12 2009/03/03 05:29:58 each Exp $";
  20 #endif
  21 #include <sys/cdefs.h>
  22 __FBSDID("$FreeBSD$");
  23
  24 /* Import. */
  25
  26 #include "port_before.h"
  27
  28 #include <sys/types.h>
  29 #include <sys/socket.h>
  30
  31 #include <netinet/in.h>
  32 #include <arpa/nameser.h>
  33 #include <arpa/inet.h>
  34
  35 #ifdef _LIBC
  36 #include <assert.h>
  37 #define INSIST(cond)    assert(cond)
  38 #else
  39 #include <isc/assertions.h>
  40 #include <isc/dst.h>
  41 #endif
  42 #include <errno.h>
  43 #include <resolv.h>
  44 #include <string.h>
  45 #include <ctype.h>
  46
  47 #include "port_after.h"
  48
  49 #ifdef SPRINTF_CHAR
  50 # define SPRINTF(x) strlen(sprintf/**/x)
  51 #else
  52 # define SPRINTF(x) ((size_t)sprintf x)
  53 #endif
  54
  55 /* Forward. */
  56
  57 static size_t   prune_origin(const char *name, const char *origin);
  58 static int      charstr(const u_char *rdata, const u_char *edata,
  59                         char **buf, size_t *buflen);
  60 static int      addname(const u_char *msg, size_t msglen,
  61                         const u_char **p, const char *origin,
  62                         char **buf, size_t *buflen);
  63 static void     addlen(size_t len, char **buf, size_t *buflen);
  64 static int      addstr(const char *src, size_t len,
  65                        char **buf, size_t *buflen);
  66 static int      addtab(size_t len, size_t target, int spaced,
  67                        char **buf, size_t *buflen);
  68
  69 /* Macros. */
  70
  71 #define T(x) \
  72         do { \
  73                 if ((x) < 0) \
  74                         return (-1); \
  75         } while (0)
  76
  77 static const char base32hex[] =
  78         "0123456789ABCDEFGHIJKLMNOPQRSTUV=0123456789abcdefghijklmnopqrstuv";
  79
  80 /* Public. */
  81
  82 /*%
  83  *      Convert an RR to presentation format.
  84  *
  85  * return:
  86  *\li   Number of characters written to buf, or -1 (check errno).
  87  */
  88 int
  89 ns_sprintrr(const ns_msg *handle, const ns_rr *rr,
  90             const char *name_ctx, const char *origin,
  91             char *buf, size_t buflen)
  92 {
  93         int n;
  94
  95         n = ns_sprintrrf(ns_msg_base(*handle), ns_msg_size(*handle),
  96                          ns_rr_name(*rr), ns_rr_class(*rr), ns_rr_type(*rr),
  97                          ns_rr_ttl(*rr), ns_rr_rdata(*rr), ns_rr_rdlen(*rr),
  98                          name_ctx, origin, buf, buflen);
  99         return (n);
 100 }
 101
 102 /*%
 103  *      Convert the fields of an RR into presentation format.
 104  *
 105  * return:
 106  *\li   Number of characters written to buf, or -1 (check errno).
 107  */
 108 int
 109 ns_sprintrrf(const u_char *msg, size_t msglen,
 110             const char *name, ns_class class, ns_type type,
 111             u_long ttl, const u_char *rdata, size_t rdlen,
 112             const char *name_ctx, const char *origin,
 113             char *buf, size_t buflen)
 114 {
 115         const char *obuf = buf;
 116         const u_char *edata = rdata + rdlen;
 117         int spaced = 0;
 118
 119         const char *comment;
 120         char tmp[100];
 121         int len, x;
 122
 123         /*
 124          * Owner.
 125          */
 126         if (name_ctx != NULL && ns_samename(name_ctx, name) == 1) {
 127                 T(addstr("\t\t\t", 3, &buf, &buflen));
 128         } else {
 129                 len = prune_origin(name, origin);
 130                 if (*name == '\0') {
 131                         goto root;
 132                 } else if (len == 0) {
 133                         T(addstr("@\t\t\t", 4, &buf, &buflen));
 134                 } else {
 135                         T(addstr(name, len, &buf, &buflen));
 136                         /* Origin not used or not root, and no trailing dot? */
 137                         if (((origin == NULL || origin[0] == '\0') ||
 138                             (origin[0] != '.' && origin[1] != '\0' &&
 139                             name[len] == '\0')) && name[len - 1] != '.') {
 140  root:
 141                                 T(addstr(".", 1, &buf, &buflen));
 142                                 len++;
 143                         }
 144                         T(spaced = addtab(len, 24, spaced, &buf, &buflen));
 145                 }
 146         }
 147
 148         /*
 149          * TTL, Class, Type.
 150          */
 151         T(x = ns_format_ttl(ttl, buf, buflen));
 152         addlen(x, &buf, &buflen);
 153         len = SPRINTF((tmp, " %s %s", p_class(class), p_type(type)));
 154         T(addstr(tmp, len, &buf, &buflen));
 155         T(spaced = addtab(x + len, 16, spaced, &buf, &buflen));
 156
 157         /*
 158          * RData.
 159          */
 160         switch (type) {
 161         case ns_t_a:
 162                 if (rdlen != (size_t)NS_INADDRSZ)
 163                         goto formerr;
 164                 (void) inet_ntop(AF_INET, rdata, buf, buflen);
 165                 addlen(strlen(buf), &buf, &buflen);
 166                 break;
 167
 168         case ns_t_cname:
 169         case ns_t_mb:
 170         case ns_t_mg:
 171         case ns_t_mr:
 172         case ns_t_ns:
 173         case ns_t_ptr:
 174         case ns_t_dname:
 175                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 176                 break;
 177
 178         case ns_t_hinfo:
 179         case ns_t_isdn:
 180                 /* First word. */
 181                 T(len = charstr(rdata, edata, &buf, &buflen));
 182                 if (len == 0)
 183                         goto formerr;
 184                 rdata += len;
 185                 T(addstr(" ", 1, &buf, &buflen));
 186
 187
 188                 /* Second word, optional in ISDN records. */
 189                 if (type == ns_t_isdn && rdata == edata)
 190                         break;
 191
 192                 T(len = charstr(rdata, edata, &buf, &buflen));
 193                 if (len == 0)
 194                         goto formerr;
 195                 rdata += len;
 196                 break;
 197
 198         case ns_t_soa: {
 199                 u_long t;
 200
 201                 /* Server name. */
 202                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 203                 T(addstr(" ", 1, &buf, &buflen));
 204
 205                 /* Administrator name. */
 206                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 207                 T(addstr(" (\n", 3, &buf, &buflen));
 208                 spaced = 0;
 209
 210                 if ((edata - rdata) != 5*NS_INT32SZ)
 211                         goto formerr;
 212
 213                 /* Serial number. */
 214                 t = ns_get32(rdata);  rdata += NS_INT32SZ;
 215                 T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
 216                 len = SPRINTF((tmp, "%lu", t));
 217                 T(addstr(tmp, len, &buf, &buflen));
 218                 T(spaced = addtab(len, 16, spaced, &buf, &buflen));
 219                 T(addstr("; serial\n", 9, &buf, &buflen));
 220                 spaced = 0;
 221
 222                 /* Refresh interval. */
 223                 t = ns_get32(rdata);  rdata += NS_INT32SZ;
 224                 T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
 225                 T(len = ns_format_ttl(t, buf, buflen));
 226                 addlen(len, &buf, &buflen);
 227                 T(spaced = addtab(len, 16, spaced, &buf, &buflen));
 228                 T(addstr("; refresh\n", 10, &buf, &buflen));
 229                 spaced = 0;
 230
 231                 /* Retry interval. */
 232                 t = ns_get32(rdata);  rdata += NS_INT32SZ;
 233                 T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
 234                 T(len = ns_format_ttl(t, buf, buflen));
 235                 addlen(len, &buf, &buflen);
 236                 T(spaced = addtab(len, 16, spaced, &buf, &buflen));
 237                 T(addstr("; retry\n", 8, &buf, &buflen));
 238                 spaced = 0;
 239
 240                 /* Expiry. */
 241                 t = ns_get32(rdata);  rdata += NS_INT32SZ;
 242                 T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
 243                 T(len = ns_format_ttl(t, buf, buflen));
 244                 addlen(len, &buf, &buflen);
 245                 T(spaced = addtab(len, 16, spaced, &buf, &buflen));
 246                 T(addstr("; expiry\n", 9, &buf, &buflen));
 247                 spaced = 0;
 248
 249                 /* Minimum TTL. */
 250                 t = ns_get32(rdata);  rdata += NS_INT32SZ;
 251                 T(addstr("\t\t\t\t\t", 5, &buf, &buflen));
 252                 T(len = ns_format_ttl(t, buf, buflen));
 253                 addlen(len, &buf, &buflen);
 254                 T(addstr(" )", 2, &buf, &buflen));
 255                 T(spaced = addtab(len, 16, spaced, &buf, &buflen));
 256                 T(addstr("; minimum\n", 10, &buf, &buflen));
 257
 258                 break;
 259             }
 260
 261         case ns_t_mx:
 262         case ns_t_afsdb:
 263         case ns_t_rt:
 264         case ns_t_kx: {
 265                 u_int t;
 266
 267                 if (rdlen < (size_t)NS_INT16SZ)
 268                         goto formerr;
 269
 270                 /* Priority. */
 271                 t = ns_get16(rdata);
 272                 rdata += NS_INT16SZ;
 273                 len = SPRINTF((tmp, "%u ", t));
 274                 T(addstr(tmp, len, &buf, &buflen));
 275
 276                 /* Target. */
 277                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 278
 279                 break;
 280             }
 281
 282         case ns_t_px: {
 283                 u_int t;
 284
 285                 if (rdlen < (size_t)NS_INT16SZ)
 286                         goto formerr;
 287
 288                 /* Priority. */
 289                 t = ns_get16(rdata);
 290                 rdata += NS_INT16SZ;
 291                 len = SPRINTF((tmp, "%u ", t));
 292                 T(addstr(tmp, len, &buf, &buflen));
 293
 294                 /* Name1. */
 295                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 296                 T(addstr(" ", 1, &buf, &buflen));
 297
 298                 /* Name2. */
 299                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 300
 301                 break;
 302             }
 303
 304         case ns_t_x25:
 305                 T(len = charstr(rdata, edata, &buf, &buflen));
 306                 if (len == 0)
 307                         goto formerr;
 308                 rdata += len;
 309                 break;
 310
 311         case ns_t_txt:
 312         case ns_t_spf:
 313                 while (rdata < edata) {
 314                         T(len = charstr(rdata, edata, &buf, &buflen));
 315                         if (len == 0)
 316                                 goto formerr;
 317                         rdata += len;
 318                         if (rdata < edata)
 319                                 T(addstr(" ", 1, &buf, &buflen));
 320                 }
 321                 break;
 322
 323         case ns_t_nsap: {
 324                 char t[2+255*3];
 325
 326                 (void) inet_nsap_ntoa(rdlen, rdata, t);
 327                 T(addstr(t, strlen(t), &buf, &buflen));
 328                 break;
 329             }
 330
 331         case ns_t_aaaa:
 332                 if (rdlen != (size_t)NS_IN6ADDRSZ)
 333                         goto formerr;
 334                 (void) inet_ntop(AF_INET6, rdata, buf, buflen);
 335                 addlen(strlen(buf), &buf, &buflen);
 336                 break;
 337
 338         case ns_t_loc: {
 339                 char t[255];
 340
 341                 /* XXX protocol format checking? */
 342                 (void) loc_ntoa(rdata, t);
 343                 T(addstr(t, strlen(t), &buf, &buflen));
 344                 break;
 345             }
 346
 347         case ns_t_naptr: {
 348                 u_int order, preference;
 349                 char t[50];
 350
 351                 if (rdlen < 2U*NS_INT16SZ)
 352                         goto formerr;
 353
 354                 /* Order, Precedence. */
 355                 order = ns_get16(rdata);        rdata += NS_INT16SZ;
 356                 preference = ns_get16(rdata);   rdata += NS_INT16SZ;
 357                 len = SPRINTF((t, "%u %u ", order, preference));
 358                 T(addstr(t, len, &buf, &buflen));
 359
 360                 /* Flags. */
 361                 T(len = charstr(rdata, edata, &buf, &buflen));
 362                 if (len == 0)
 363                         goto formerr;
 364                 rdata += len;
 365                 T(addstr(" ", 1, &buf, &buflen));
 366
 367                 /* Service. */
 368                 T(len = charstr(rdata, edata, &buf, &buflen));
 369                 if (len == 0)
 370                         goto formerr;
 371                 rdata += len;
 372                 T(addstr(" ", 1, &buf, &buflen));
 373
 374                 /* Regexp. */
 375                 T(len = charstr(rdata, edata, &buf, &buflen));
 376                 if (len < 0)
 377                         return (-1);
 378                 if (len == 0)
 379                         goto formerr;
 380                 rdata += len;
 381                 T(addstr(" ", 1, &buf, &buflen));
 382
 383                 /* Server. */
 384                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 385                 break;
 386             }
 387
 388         case ns_t_srv: {
 389                 u_int priority, weight, port;
 390                 char t[50];
 391
 392                 if (rdlen < 3U*NS_INT16SZ)
 393                         goto formerr;
 394
 395                 /* Priority, Weight, Port. */
 396                 priority = ns_get16(rdata);  rdata += NS_INT16SZ;
 397                 weight   = ns_get16(rdata);  rdata += NS_INT16SZ;
 398                 port     = ns_get16(rdata);  rdata += NS_INT16SZ;
 399                 len = SPRINTF((t, "%u %u %u ", priority, weight, port));
 400                 T(addstr(t, len, &buf, &buflen));
 401
 402                 /* Server. */
 403                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 404                 break;
 405             }
 406
 407         case ns_t_minfo:
 408         case ns_t_rp:
 409                 /* Name1. */
 410                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 411                 T(addstr(" ", 1, &buf, &buflen));
 412
 413                 /* Name2. */
 414                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 415
 416                 break;
 417
 418         case ns_t_wks: {
 419                 int n, lcnt;
 420
 421                 if (rdlen < 1U + NS_INT32SZ)
 422                         goto formerr;
 423
 424                 /* Address. */
 425                 (void) inet_ntop(AF_INET, rdata, buf, buflen);
 426                 addlen(strlen(buf), &buf, &buflen);
 427                 rdata += NS_INADDRSZ;
 428
 429                 /* Protocol. */
 430                 len = SPRINTF((tmp, " %u ( ", *rdata));
 431                 T(addstr(tmp, len, &buf, &buflen));
 432                 rdata += NS_INT8SZ;
 433
 434                 /* Bit map. */
 435                 n = 0;
 436                 lcnt = 0;
 437                 while (rdata < edata) {
 438                         u_int c = *rdata++;
 439                         do {
 440                                 if (c & 0200) {
 441                                         if (lcnt == 0) {
 442                                                 T(addstr("\n\t\t\t\t", 5,
 443                                                          &buf, &buflen));
 444                                                 lcnt = 10;
 445                                                 spaced = 0;
 446                                         }
 447                                         len = SPRINTF((tmp, "%d ", n));
 448                                         T(addstr(tmp, len, &buf, &buflen));
 449                                         lcnt--;
 450                                 }
 451                                 c <<= 1;
 452                         } while (++n & 07);
 453                 }
 454                 T(addstr(")", 1, &buf, &buflen));
 455
 456                 break;
 457             }
 458
 459         case ns_t_key:
 460         case ns_t_dnskey: {
 461                 char base64_key[NS_MD5RSA_MAX_BASE64];
 462                 u_int keyflags, protocol, algorithm, key_id;
 463                 const char *leader;
 464                 int n;
 465
 466                 if (rdlen < 0U + NS_INT16SZ + NS_INT8SZ + NS_INT8SZ)
 467                         goto formerr;
 468
 469                 /* Key flags, Protocol, Algorithm. */
 470 #ifndef _LIBC
 471                 key_id = dst_s_dns_key_id(rdata, edata-rdata);
 472 #else
 473                 key_id = 0;
 474 #endif
 475                 keyflags = ns_get16(rdata);  rdata += NS_INT16SZ;
 476                 protocol = *rdata++;
 477                 algorithm = *rdata++;
 478                 len = SPRINTF((tmp, "0x%04x %u %u",
 479                                keyflags, protocol, algorithm));
 480                 T(addstr(tmp, len, &buf, &buflen));
 481
 482                 /* Public key data. */
 483                 len = b64_ntop(rdata, edata - rdata,
 484                                base64_key, sizeof base64_key);
 485                 if (len < 0)
 486                         goto formerr;
 487                 if (len > 15) {
 488                         T(addstr(" (", 2, &buf, &buflen));
 489                         leader = "\n\t\t";
 490                         spaced = 0;
 491                 } else
 492                         leader = " ";
 493                 for (n = 0; n < len; n += 48) {
 494                         T(addstr(leader, strlen(leader), &buf, &buflen));
 495                         T(addstr(base64_key + n, MIN(len - n, 48),
 496                                  &buf, &buflen));
 497                 }
 498                 if (len > 15)
 499                         T(addstr(" )", 2, &buf, &buflen));
 500                 n = SPRINTF((tmp, " ; key_tag= %u", key_id));
 501                 T(addstr(tmp, n, &buf, &buflen));
 502
 503                 break;
 504             }
 505
 506         case ns_t_sig:
 507         case ns_t_rrsig: {
 508                 char base64_key[NS_MD5RSA_MAX_BASE64];
 509                 u_int type, algorithm, labels, footprint;
 510                 const char *leader;
 511                 u_long t;
 512                 int n;
 513
 514                 if (rdlen < 22U)
 515                         goto formerr;
 516
 517                 /* Type covered, Algorithm, Label count, Original TTL. */
 518                 type = ns_get16(rdata);  rdata += NS_INT16SZ;
 519                 algorithm = *rdata++;
 520                 labels = *rdata++;
 521                 t = ns_get32(rdata);  rdata += NS_INT32SZ;
 522                 len = SPRINTF((tmp, "%s %d %d %lu ",
 523                                p_type(type), algorithm, labels, t));
 524                 T(addstr(tmp, len, &buf, &buflen));
 525                 if (labels > (u_int)dn_count_labels(name))
 526                         goto formerr;
 527
 528                 /* Signature expiry. */
 529                 t = ns_get32(rdata);  rdata += NS_INT32SZ;
 530                 len = SPRINTF((tmp, "%s ", p_secstodate(t)));
 531                 T(addstr(tmp, len, &buf, &buflen));
 532
 533                 /* Time signed. */
 534                 t = ns_get32(rdata);  rdata += NS_INT32SZ;
 535                 len = SPRINTF((tmp, "%s ", p_secstodate(t)));
 536                 T(addstr(tmp, len, &buf, &buflen));
 537
 538                 /* Signature Footprint. */
 539                 footprint = ns_get16(rdata);  rdata += NS_INT16SZ;
 540                 len = SPRINTF((tmp, "%u ", footprint));
 541                 T(addstr(tmp, len, &buf, &buflen));
 542
 543                 /* Signer's name. */
 544                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 545
 546                 /* Signature. */
 547                 len = b64_ntop(rdata, edata - rdata,
 548                                base64_key, sizeof base64_key);
 549                 if (len > 15) {
 550                         T(addstr(" (", 2, &buf, &buflen));
 551                         leader = "\n\t\t";
 552                         spaced = 0;
 553                 } else
 554                         leader = " ";
 555                 if (len < 0)
 556                         goto formerr;
 557                 for (n = 0; n < len; n += 48) {
 558                         T(addstr(leader, strlen(leader), &buf, &buflen));
 559                         T(addstr(base64_key + n, MIN(len - n, 48),
 560                                  &buf, &buflen));
 561                 }
 562                 if (len > 15)
 563                         T(addstr(" )", 2, &buf, &buflen));
 564                 break;
 565             }
 566
 567         case ns_t_nxt: {
 568                 int n, c;
 569
 570                 /* Next domain name. */
 571                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 572
 573                 /* Type bit map. */
 574                 n = edata - rdata;
 575                 for (c = 0; c < n*8; c++)
 576                         if (NS_NXT_BIT_ISSET(c, rdata)) {
 577                                 len = SPRINTF((tmp, " %s", p_type(c)));
 578                                 T(addstr(tmp, len, &buf, &buflen));
 579                         }
 580                 break;
 581             }
 582
 583         case ns_t_cert: {
 584                 u_int c_type, key_tag, alg;
 585                 int n;
 586                 unsigned int siz;
 587                 char base64_cert[8192], tmp[40];
 588                 const char *leader;
 589
 590                 c_type  = ns_get16(rdata); rdata += NS_INT16SZ;
 591                 key_tag = ns_get16(rdata); rdata += NS_INT16SZ;
 592                 alg = (u_int) *rdata++;
 593
 594                 len = SPRINTF((tmp, "%d %d %d ", c_type, key_tag, alg));
 595                 T(addstr(tmp, len, &buf, &buflen));
 596                 siz = (edata-rdata)*4/3 + 4; /* "+4" accounts for trailing \0 */
 597                 if (siz > sizeof(base64_cert) * 3/4) {
 598                         const char *str = "record too long to print";
 599                         T(addstr(str, strlen(str), &buf, &buflen));
 600                 }
 601                 else {
 602                         len = b64_ntop(rdata, edata-rdata, base64_cert, siz);
 603
 604                         if (len < 0)
 605                                 goto formerr;
 606                         else if (len > 15) {
 607                                 T(addstr(" (", 2, &buf, &buflen));
 608                                 leader = "\n\t\t";
 609                                 spaced = 0;
 610                         }
 611                         else
 612                                 leader = " ";
 613
 614                         for (n = 0; n < len; n += 48) {
 615                                 T(addstr(leader, strlen(leader),
 616                                          &buf, &buflen));
 617                                 T(addstr(base64_cert + n, MIN(len - n, 48),
 618                                          &buf, &buflen));
 619                         }
 620                         if (len > 15)
 621                                 T(addstr(" )", 2, &buf, &buflen));
 622                 }
 623                 break;
 624             }
 625
 626         case ns_t_tkey: {
 627                 /* KJD - need to complete this */
 628                 u_long t;
 629                 int mode, err, keysize;
 630
 631                 /* Algorithm name. */
 632                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 633                 T(addstr(" ", 1, &buf, &buflen));
 634
 635                 /* Inception. */
 636                 t = ns_get32(rdata);  rdata += NS_INT32SZ;
 637                 len = SPRINTF((tmp, "%s ", p_secstodate(t)));
 638                 T(addstr(tmp, len, &buf, &buflen));
 639
 640                 /* Experation. */
 641                 t = ns_get32(rdata);  rdata += NS_INT32SZ;
 642                 len = SPRINTF((tmp, "%s ", p_secstodate(t)));
 643                 T(addstr(tmp, len, &buf, &buflen));
 644
 645                 /* Mode , Error, Key Size. */
 646                 /* Priority, Weight, Port. */
 647                 mode = ns_get16(rdata);  rdata += NS_INT16SZ;
 648                 err  = ns_get16(rdata);  rdata += NS_INT16SZ;
 649                 keysize  = ns_get16(rdata);  rdata += NS_INT16SZ;
 650                 len = SPRINTF((tmp, "%u %u %u ", mode, err, keysize));
 651                 T(addstr(tmp, len, &buf, &buflen));
 652
 653                 /* XXX need to dump key, print otherdata length & other data */
 654                 break;
 655             }
 656
 657         case ns_t_tsig: {
 658                 /* BEW - need to complete this */
 659                 int n;
 660
 661                 T(len = addname(msg, msglen, &rdata, origin, &buf, &buflen));
 662                 T(addstr(" ", 1, &buf, &buflen));
 663                 rdata += 8; /*%< time */
 664                 n = ns_get16(rdata); rdata += INT16SZ;
 665                 rdata += n; /*%< sig */
 666                 n = ns_get16(rdata); rdata += INT16SZ; /*%< original id */
 667                 sprintf(buf, "%d", ns_get16(rdata));
 668                 rdata += INT16SZ;
 669                 addlen(strlen(buf), &buf, &buflen);
 670                 break;
 671             }
 672
 673         case ns_t_a6: {
 674                 struct in6_addr a;
 675                 int pbyte, pbit;
 676
 677                 /* prefix length */
 678                 if (rdlen == 0U) goto formerr;
 679                 len = SPRINTF((tmp, "%d ", *rdata));
 680                 T(addstr(tmp, len, &buf, &buflen));
 681                 pbit = *rdata;
 682                 if (pbit > 128) goto formerr;
 683                 pbyte = (pbit & ~7) / 8;
 684                 rdata++;
 685
 686                 /* address suffix: provided only when prefix len != 128 */
 687                 if (pbit < 128) {
 688                         if (rdata + pbyte >= edata) goto formerr;
 689                         memset(&a, 0, sizeof(a));
 690                         memcpy(&a.s6_addr[pbyte], rdata, sizeof(a) - pbyte);
 691                         (void) inet_ntop(AF_INET6, &a, buf, buflen);
 692                         addlen(strlen(buf), &buf, &buflen);
 693                         rdata += sizeof(a) - pbyte;
 694                 }
 695
 696                 /* prefix name: provided only when prefix len > 0 */
 697                 if (pbit == 0)
 698                         break;
 699                 if (rdata >= edata) goto formerr;
 700                 T(addstr(" ", 1, &buf, &buflen));
 701                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 702
 703                 break;
 704             }
 705
 706         case ns_t_opt: {
 707                 len = SPRINTF((tmp, "%u bytes", class));
 708                 T(addstr(tmp, len, &buf, &buflen));
 709                 break;
 710             }
 711
 712         case ns_t_ds:
 713         case ns_t_dlv:
 714         case ns_t_sshfp: {
 715                 u_int t;
 716
 717                 if (type == ns_t_ds || type == ns_t_dlv) {
 718                         if (rdlen < 4U) goto formerr;
 719                         t = ns_get16(rdata);
 720                         rdata += NS_INT16SZ;
 721                         len = SPRINTF((tmp, "%u ", t));
 722                         T(addstr(tmp, len, &buf, &buflen));
 723                 } else
 724                         if (rdlen < 2U) goto formerr;
 725
 726                 len = SPRINTF((tmp, "%u ", *rdata));
 727                 T(addstr(tmp, len, &buf, &buflen));
 728                 rdata++;
 729
 730                 len = SPRINTF((tmp, "%u ", *rdata));
 731                 T(addstr(tmp, len, &buf, &buflen));
 732                 rdata++;
 733
 734                 while (rdata < edata) {
 735                         len = SPRINTF((tmp, "%02X", *rdata));
 736                         T(addstr(tmp, len, &buf, &buflen));
 737                         rdata++;
 738                 }
 739                 break;
 740             }
 741
 742         case ns_t_nsec3:
 743         case ns_t_nsec3param: {
 744                 u_int t, w, l, j, k, c;
 745
 746                 len = SPRINTF((tmp, "%u ", *rdata));
 747                 T(addstr(tmp, len, &buf, &buflen));
 748                 rdata++;
 749
 750                 len = SPRINTF((tmp, "%u ", *rdata));
 751                 T(addstr(tmp, len, &buf, &buflen));
 752                 rdata++;
 753
 754                 t = ns_get16(rdata);
 755                 rdata += NS_INT16SZ;
 756                 len = SPRINTF((tmp, "%u ", t));
 757                 T(addstr(tmp, len, &buf, &buflen));
 758
 759                 t = *rdata++;
 760                 if (t == 0) {
 761                         T(addstr("-", 1, &buf, &buflen));
 762                 } else {
 763                         while (t-- > 0) {
 764                                 len = SPRINTF((tmp, "%02X", *rdata));
 765                                 T(addstr(tmp, len, &buf, &buflen));
 766                                 rdata++;
 767                         }
 768                 }
 769                 if (type == ns_t_nsec3param)
 770                         break;
 771                 T(addstr(" ", 1, &buf, &buflen));
 772
 773                 t = *rdata++;
 774                 while (t > 0) {
 775                         switch (t) {
 776                         case 1:
 777                                 tmp[0] = base32hex[((rdata[0]>>3)&0x1f)];
 778                                 tmp[1] = base32hex[((rdata[0]<<2)&0x1c)];
 779                                 tmp[2] = tmp[3] = tmp[4] = '=';
 780                                 tmp[5] = tmp[6] = tmp[7] = '=';
 781                                 break;
 782                         case 2:
 783                                 tmp[0] = base32hex[((rdata[0]>>3)&0x1f)];
 784                                 tmp[1] = base32hex[((rdata[0]<<2)&0x1c)|
 785                                                    ((rdata[1]>>6)&0x03)];
 786                                 tmp[2] = base32hex[((rdata[1]>>1)&0x1f)];
 787                                 tmp[3] = base32hex[((rdata[1]<<4)&0x10)];
 788                                 tmp[4] = tmp[5] = tmp[6] = tmp[7] = '=';
 789                                 break;
 790                         case 3:
 791                                 tmp[0] = base32hex[((rdata[0]>>3)&0x1f)];
 792                                 tmp[1] = base32hex[((rdata[0]<<2)&0x1c)|
 793                                                    ((rdata[1]>>6)&0x03)];
 794                                 tmp[2] = base32hex[((rdata[1]>>1)&0x1f)];
 795                                 tmp[3] = base32hex[((rdata[1]<<4)&0x10)|
 796                                                    ((rdata[2]>>4)&0x0f)];
 797                                 tmp[4] = base32hex[((rdata[2]<<1)&0x1e)];
 798                                 tmp[5] = tmp[6] = tmp[7] = '=';
 799                                 break;
 800                         case 4:
 801                                 tmp[0] = base32hex[((rdata[0]>>3)&0x1f)];
 802                                 tmp[1] = base32hex[((rdata[0]<<2)&0x1c)|
 803                                                    ((rdata[1]>>6)&0x03)];
 804                                 tmp[2] = base32hex[((rdata[1]>>1)&0x1f)];
 805                                 tmp[3] = base32hex[((rdata[1]<<4)&0x10)|
 806                                                    ((rdata[2]>>4)&0x0f)];
 807                                 tmp[4] = base32hex[((rdata[2]<<1)&0x1e)|
 808                                                    ((rdata[3]>>7)&0x01)];
 809                                 tmp[5] = base32hex[((rdata[3]>>2)&0x1f)];
 810                                 tmp[6] = base32hex[(rdata[3]<<3)&0x18];
 811                                 tmp[7] = '=';
 812                                 break;
 813                         default:
 814                                 tmp[0] = base32hex[((rdata[0]>>3)&0x1f)];
 815                                 tmp[1] = base32hex[((rdata[0]<<2)&0x1c)|
 816                                                    ((rdata[1]>>6)&0x03)];
 817                                 tmp[2] = base32hex[((rdata[1]>>1)&0x1f)];
 818                                 tmp[3] = base32hex[((rdata[1]<<4)&0x10)|
 819                                                    ((rdata[2]>>4)&0x0f)];
 820                                 tmp[4] = base32hex[((rdata[2]<<1)&0x1e)|
 821                                                    ((rdata[3]>>7)&0x01)];
 822                                 tmp[5] = base32hex[((rdata[3]>>2)&0x1f)];
 823                                 tmp[6] = base32hex[((rdata[3]<<3)&0x18)|
 824                                                    ((rdata[4]>>5)&0x07)];
 825                                 tmp[7] = base32hex[(rdata[4]&0x1f)];
 826                                 break;
 827                         }
 828                         T(addstr(tmp, 8, &buf, &buflen));
 829                         if (t >= 5) {
 830                                 rdata += 5;
 831                                 t -= 5;
 832                         } else {
 833                                 rdata += t;
 834                                 t -= t;
 835                         }
 836                 }
 837
 838                 while (rdata < edata) {
 839                         w = *rdata++;
 840                         l = *rdata++;
 841                         for (j = 0; j < l; j++) {
 842                                 if (rdata[j] == 0)
 843                                         continue;
 844                                 for (k = 0; k < 8; k++) {
 845                                         if ((rdata[j] & (0x80 >> k)) == 0)
 846                                                 continue;
 847                                         c = w * 256 + j * 8 + k;
 848                                         len = SPRINTF((tmp, " %s", p_type(c)));
 849                                         T(addstr(tmp, len, &buf, &buflen));
 850                                 }
 851                         }
 852                         rdata += l;
 853                 }
 854                 break;
 855             }
 856
 857         case ns_t_nsec: {
 858                 u_int w, l, j, k, c;
 859
 860                 T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 861
 862                 while (rdata < edata) {
 863                         w = *rdata++;
 864                         l = *rdata++;
 865                         for (j = 0; j < l; j++) {
 866                                 if (rdata[j] == 0)
 867                                         continue;
 868                                 for (k = 0; k < 8; k++) {
 869                                         if ((rdata[j] & (0x80 >> k)) == 0)
 870                                                 continue;
 871                                         c = w * 256 + j * 8 + k;
 872                                         len = SPRINTF((tmp, " %s", p_type(c)));
 873                                         T(addstr(tmp, len, &buf, &buflen));
 874                                 }
 875                         }
 876                         rdata += l;
 877                 }
 878                 break;
 879             }
 880
 881         case ns_t_dhcid: {
 882                 int n;
 883                 unsigned int siz;
 884                 char base64_dhcid[8192];
 885                 const char *leader;
 886
 887                 siz = (edata-rdata)*4/3 + 4; /* "+4" accounts for trailing \0 */
 888                 if (siz > sizeof(base64_dhcid) * 3/4) {
 889                         const char *str = "record too long to print";
 890                         T(addstr(str, strlen(str), &buf, &buflen));
 891                 } else {
 892                         len = b64_ntop(rdata, edata-rdata, base64_dhcid, siz);
 893
 894                         if (len < 0)
 895                                 goto formerr;
 896
 897                         else if (len > 15) {
 898                                 T(addstr(" (", 2, &buf, &buflen));
 899                                 leader = "\n\t\t";
 900                                 spaced = 0;
 901                         }
 902                         else
 903                                 leader = " ";
 904
 905                         for (n = 0; n < len; n += 48) {
 906                                 T(addstr(leader, strlen(leader),
 907                                          &buf, &buflen));
 908                                 T(addstr(base64_dhcid + n, MIN(len - n, 48),
 909                                          &buf, &buflen));
 910                         }
 911                         if (len > 15)
 912                                 T(addstr(" )", 2, &buf, &buflen));
 913                 }
 914                 break;
 915         }
 916
 917         case ns_t_ipseckey: {
 918                 int n;
 919                 unsigned int siz;
 920                 char base64_key[8192];
 921                 const char *leader;
 922
 923                 if (rdlen < 2)
 924                         goto formerr;
 925
 926                 switch (rdata[1]) {
 927                 case 0:
 928                 case 3:
 929                         if (rdlen < 3)
 930                                 goto formerr;
 931                         break;
 932                 case 1:
 933                         if (rdlen < 7)
 934                                 goto formerr;
 935                         break;
 936                 case 2:
 937                         if (rdlen < 19)
 938                                 goto formerr;
 939                         break;
 940                 default:
 941                         comment = "unknown IPSECKEY gateway type";
 942                         goto hexify;
 943                 }
 944
 945                 len = SPRINTF((tmp, "%u ", *rdata));
 946                 T(addstr(tmp, len, &buf, &buflen));
 947                 rdata++;
 948
 949                 len = SPRINTF((tmp, "%u ", *rdata));
 950                 T(addstr(tmp, len, &buf, &buflen));
 951                 rdata++;
 952
 953                 len = SPRINTF((tmp, "%u ", *rdata));
 954                 T(addstr(tmp, len, &buf, &buflen));
 955                 rdata++;
 956
 957                 switch (rdata[-2]) {
 958                 case 0:
 959                         T(addstr(".", 1, &buf, &buflen));
 960                         break;
 961                 case 1:
 962                         (void) inet_ntop(AF_INET, rdata, buf, buflen);
 963                         addlen(strlen(buf), &buf, &buflen);
 964                         rdata += 4;
 965                         break;
 966                 case 2:
 967                         (void) inet_ntop(AF_INET6, rdata, buf, buflen);
 968                         addlen(strlen(buf), &buf, &buflen);
 969                         rdata += 16;
 970                         break;
 971                 case 3:
 972                         T(addname(msg, msglen, &rdata, origin, &buf, &buflen));
 973                         break;
 974                 }
 975
 976                 if (rdata >= edata)
 977                         break;
 978
 979                 siz = (edata-rdata)*4/3 + 4; /* "+4" accounts for trailing \0 */
 980                 if (siz > sizeof(base64_key) * 3/4) {
 981                         const char *str = "record too long to print";
 982                         T(addstr(str, strlen(str), &buf, &buflen));
 983                 } else {
 984                         len = b64_ntop(rdata, edata-rdata, base64_key, siz);
 985
 986                         if (len < 0)
 987                                 goto formerr;
 988
 989                         else if (len > 15) {
 990                                 T(addstr(" (", 2, &buf, &buflen));
 991                                 leader = "\n\t\t";
 992                                 spaced = 0;
 993                         }
 994                         else
 995                                 leader = " ";
 996
 997                         for (n = 0; n < len; n += 48) {
 998                                 T(addstr(leader, strlen(leader),
 999                                          &buf, &buflen));
1000                                 T(addstr(base64_key + n, MIN(len - n, 48),
1001                                          &buf, &buflen));
1002                         }
1003                         if (len > 15)
1004                                 T(addstr(" )", 2, &buf, &buflen));
1005                 }
1006         }
1007
1008         case ns_t_hip: {
1009                 unsigned int i, hip_len, algorithm, key_len;
1010                 char base64_key[NS_MD5RSA_MAX_BASE64];
1011                 unsigned int siz;
1012                 const char *leader = "\n\t\t\t\t\t";
1013
1014                 hip_len = *rdata++;
1015                 algorithm = *rdata++;
1016                 key_len = ns_get16(rdata);
1017                 rdata += NS_INT16SZ;
1018
1019                 siz = key_len*4/3 + 4; /* "+4" accounts for trailing \0 */
1020                 if (siz > sizeof(base64_key) * 3/4) {
1021                         const char *str = "record too long to print";
1022                         T(addstr(str, strlen(str), &buf, &buflen));
1023                 } else {
1024                         len = sprintf(tmp, "( %u ", algorithm);
1025                         T(addstr(tmp, len, &buf, &buflen));
1026
1027                         for (i = 0; i < hip_len; i++) {
1028                                 len = sprintf(tmp, "%02X", *rdata);
1029                                 T(addstr(tmp, len, &buf, &buflen));
1030                                 rdata++;
1031                         }
1032                         T(addstr(leader, strlen(leader), &buf, &buflen));
1033
1034                         len = b64_ntop(rdata, key_len, base64_key, siz);
1035                         if (len < 0)
1036                                 goto formerr;
1037
1038                         T(addstr(base64_key, len, &buf, &buflen));
1039
1040                         rdata += key_len;
1041                         while (rdata < edata) {
1042                                 T(addstr(leader, strlen(leader), &buf, &buflen));
1043                                 T(addname(msg, msglen, &rdata, origin,
1044                                           &buf, &buflen));
1045                         }
1046                         T(addstr(" )", 2, &buf, &buflen));
1047                 }
1048                 break;
1049         }
1050
1051         default:
1052                 comment = "unknown RR type";
1053                 goto hexify;
1054         }
1055         return (buf - obuf);
1056  formerr:
1057         comment = "RR format error";
1058  hexify: {
1059         int n, m;
1060         char *p;
1061
1062         len = SPRINTF((tmp, "\\# %u%s\t; %s", (unsigned)(edata - rdata),
1063                        rdlen != 0U ? " (" : "", comment));
1064         T(addstr(tmp, len, &buf, &buflen));
1065         while (rdata < edata) {
1066                 p = tmp;
1067                 p += SPRINTF((p, "\n\t"));
1068                 spaced = 0;
1069                 n = MIN(16, edata - rdata);
1070                 for (m = 0; m < n; m++)
1071                         p += SPRINTF((p, "%02x ", rdata[m]));
1072                 T(addstr(tmp, p - tmp, &buf, &buflen));
1073                 if (n < 16) {
1074                         T(addstr(")", 1, &buf, &buflen));
1075                         T(addtab(p - tmp + 1, 48, spaced, &buf, &buflen));
1076                 }
1077                 p = tmp;
1078                 p += SPRINTF((p, "; "));
1079                 for (m = 0; m < n; m++)
1080                         *p++ = (isascii(rdata[m]) && isprint(rdata[m]))
1081                                 ? rdata[m]
1082                                 : '.';
1083                 T(addstr(tmp, p - tmp, &buf, &buflen));
1084                 rdata += n;
1085         }
1086         return (buf - obuf);
1087     }
1088 }
1089
1090 /* Private. */
1091
1092 /*%
1093  * size_t
1094  * prune_origin(name, origin)
1095  *      Find out if the name is at or under the current origin.
1096  * return:
1097  *      Number of characters in name before start of origin,
1098  *      or length of name if origin does not match.
1099  * notes:
1100  *      This function should share code with samedomain().
1101  */
1102 static size_t
1103 prune_origin(const char *name, const char *origin) {
1104         const char *oname = name;
1105
1106         while (*name != '\0') {
1107                 if (origin != NULL && ns_samename(name, origin) == 1)
1108                         return (name - oname - (name > oname));
1109                 while (*name != '\0') {
1110                         if (*name == '\\') {
1111                                 name++;
1112                                 /* XXX need to handle \nnn form. */
1113                                 if (*name == '\0')
1114                                         break;
1115                         } else if (*name == '.') {
1116                                 name++;
1117                                 break;
1118                         }
1119                         name++;
1120                 }
1121         }
1122         return (name - oname);
1123 }
1124
1125 /*%
1126  * int
1127  * charstr(rdata, edata, buf, buflen)
1128  *      Format a <character-string> into the presentation buffer.
1129  * return:
1130  *      Number of rdata octets consumed
1131  *      0 for protocol format error
1132  *      -1 for output buffer error
1133  * side effects:
1134  *      buffer is advanced on success.
1135  */
1136 static int
1137 charstr(const u_char *rdata, const u_char *edata, char **buf, size_t *buflen) {
1138         const u_char *odata = rdata;
1139         size_t save_buflen = *buflen;
1140         char *save_buf = *buf;
1141
1142         if (addstr("\"", 1, buf, buflen) < 0)
1143                 goto enospc;
1144         if (rdata < edata) {
1145                 int n = *rdata;
1146
1147                 if (rdata + 1 + n <= edata) {
1148                         rdata++;
1149                         while (n-- > 0) {
1150                                 if (strchr("\n\"\\", *rdata) != NULL)
1151                                         if (addstr("\\", 1, buf, buflen) < 0)
1152                                                 goto enospc;
1153                                 if (addstr((const char *)rdata, 1,
1154                                            buf, buflen) < 0)
1155                                         goto enospc;
1156                                 rdata++;
1157                         }
1158                 }
1159         }
1160         if (addstr("\"", 1, buf, buflen) < 0)
1161                 goto enospc;
1162         return (rdata - odata);
1163  enospc:
1164         errno = ENOSPC;
1165         *buf = save_buf;
1166         *buflen = save_buflen;
1167         return (-1);
1168 }
1169
1170 static int
1171 addname(const u_char *msg, size_t msglen,
1172         const u_char **pp, const char *origin,
1173         char **buf, size_t *buflen)
1174 {
1175         size_t newlen, save_buflen = *buflen;
1176         char *save_buf = *buf;
1177         int n;
1178
1179         n = dn_expand(msg, msg + msglen, *pp, *buf, *buflen);
1180         if (n < 0)
1181                 goto enospc;    /*%< Guess. */
1182         newlen = prune_origin(*buf, origin);
1183         if (**buf == '\0') {
1184                 goto root;
1185         } else if (newlen == 0U) {
1186                 /* Use "@" instead of name. */
1187                 if (newlen + 2 > *buflen)
1188                         goto enospc;        /* No room for "@\0". */
1189                 (*buf)[newlen++] = '@';
1190                 (*buf)[newlen] = '\0';
1191         } else {
1192                 if (((origin == NULL || origin[0] == '\0') ||
1193                     (origin[0] != '.' && origin[1] != '\0' &&
1194                     (*buf)[newlen] == '\0')) && (*buf)[newlen - 1] != '.') {
1195                         /* No trailing dot. */
1196  root:
1197                         if (newlen + 2 > *buflen)
1198                                 goto enospc;    /* No room for ".\0". */
1199                         (*buf)[newlen++] = '.';
1200                         (*buf)[newlen] = '\0';
1201                 }
1202         }
1203         *pp += n;
1204         addlen(newlen, buf, buflen);
1205         **buf = '\0';
1206         return (newlen);
1207  enospc:
1208         errno = ENOSPC;
1209         *buf = save_buf;
1210         *buflen = save_buflen;
1211         return (-1);
1212 }
1213
1214 static void
1215 addlen(size_t len, char **buf, size_t *buflen) {
1216         INSIST(len <= *buflen);
1217         *buf += len;
1218         *buflen -= len;
1219 }
1220
1221 static int
1222 addstr(const char *src, size_t len, char **buf, size_t *buflen) {
1223         if (len >= *buflen) {
1224                 errno = ENOSPC;
1225                 return (-1);
1226         }
1227         memcpy(*buf, src, len);
1228         addlen(len, buf, buflen);
1229         **buf = '\0';
1230         return (0);
1231 }
1232
1233 static int
1234 addtab(size_t len, size_t target, int spaced, char **buf, size_t *buflen) {
1235         size_t save_buflen = *buflen;
1236         char *save_buf = *buf;
1237         int t;
1238
1239         if (spaced || len >= target - 1) {
1240                 T(addstr("  ", 2, buf, buflen));
1241                 spaced = 1;
1242         } else {
1243                 for (t = (target - len - 1) / 8; t >= 0; t--)
1244                         if (addstr("\t", 1, buf, buflen) < 0) {
1245                                 *buflen = save_buflen;
1246                                 *buf = save_buf;
1247                                 return (-1);
1248                         }
1249                 spaced = 0;
1250         }
1251         return (spaced);
1252 }
1253
1254 /*! \file */