external/bsd/libbind/dist/resolv/res_mkupdate.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (c) 1996-1999 by Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  17  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /*! \file
  21  * \brief
  22  * Based on the Dynamic DNS reference implementation by Viraj Bais
  23  * &lt;viraj_bais@ccm.fm.intel.com>
  24  */
  25
  26 #if !defined(lint) && !defined(SABER)
  27 static const char rcsid[] = "Id: res_mkupdate.c,v 1.10 2008/12/11 09:59:00 marka Exp";
  28 #endif /* not lint */
  29
  30 #include "port_before.h"
  31
  32 #include <sys/types.h>
  33 #include <sys/param.h>
  34
  35 #include <netinet/in.h>
  36 #include <arpa/nameser.h>
  37 #include <arpa/inet.h>
  38
  39 #include <errno.h>
  40 #include <limits.h>
  41 #include <netdb.h>
  42 #include <resolv.h>
  43 #include <res_update.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <unistd.h>
  48 #include <ctype.h>
  49
  50 #include "port_after.h"
  51
  52 /* Options.  Leave them on. */
  53 #define DEBUG
  54 #define MAXPORT 1024
  55
  56 static int getnum_str(u_char **, u_char *);
  57 static int gethexnum_str(u_char **, u_char *);
  58 static int getword_str(char *, int, u_char **, u_char *);
  59 static int getstr_str(char *, int, u_char **, u_char *);
  60
  61 #define ShrinkBuffer(x)  if ((buflen -= x) < 0) return (-2);
  62
  63 /* Forward. */
  64
  65 int res_protocolnumber(const char *);
  66 int res_servicenumber(const char *);
  67
  68 /*%
  69  * Form update packets.
  70  * Returns the size of the resulting packet if no error
  71  *
  72  * On error,
  73  *      returns
  74  *\li              -1 if error in reading a word/number in rdata
  75  *                 portion for update packets
  76  *\li           -2 if length of buffer passed is insufficient
  77  *\li           -3 if zone section is not the first section in
  78  *                 the linked list, or section order has a problem
  79  *\li           -4 on a number overflow
  80  *\li           -5 unknown operation or no records
  81  */
  82 int
  83 res_nmkupdate(res_state statp, ns_updrec *rrecp_in, u_char *buf, int buflen) {
  84         ns_updrec *rrecp_start = rrecp_in;
  85         HEADER *hp;
  86         u_char *cp, *sp2, *startp, *endp;
  87         int n, i, soanum, multiline;
  88         ns_updrec *rrecp;
  89         struct in_addr ina;
  90         struct in6_addr in6a;
  91         char buf2[MAXDNAME];
  92         u_char buf3[MAXDNAME];
  93         int section, numrrs = 0, counts[ns_s_max];
  94         u_int16_t rtype, rclass;
  95         u_int32_t n1, rttl;
  96         u_char *dnptrs[20], **dpp, **lastdnptr;
  97         int siglen, keylen, certlen;
  98
  99         /*
 100          * Initialize header fields.
 101          */
 102         if ((buf == NULL) || (buflen < HFIXEDSZ))
 103                 return (-1);
 104         memset(buf, 0, HFIXEDSZ);
 105         hp = (HEADER *) buf;
 106         statp->id = res_nrandomid(statp);
 107         hp->id = htons(statp->id);
 108         hp->opcode = ns_o_update;
 109         hp->rcode = NOERROR;
 110         cp = buf + HFIXEDSZ;
 111         buflen -= HFIXEDSZ;
 112         dpp = dnptrs;
 113         *dpp++ = buf;
 114         *dpp++ = NULL;
 115         lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
 116
 117         if (rrecp_start == NULL)
 118                 return (-5);
 119         else if (rrecp_start->r_section != S_ZONE)
 120                 return (-3);
 121
 122         memset(counts, 0, sizeof counts);
 123         for (rrecp = rrecp_start; rrecp; rrecp = NEXT(rrecp, r_glink)) {
 124                 numrrs++;
 125                 section = rrecp->r_section;
 126                 if (section < 0 || section >= ns_s_max)
 127                         return (-1);
 128                 counts[section]++;
 129                 for (i = section + 1; i < ns_s_max; i++)
 130                         if (counts[i])
 131                                 return (-3);
 132                 rtype = rrecp->r_type;
 133                 rclass = rrecp->r_class;
 134                 rttl = rrecp->r_ttl;
 135                 /* overload class and type */
 136                 if (section == S_PREREQ) {
 137                         rttl = 0;
 138                         switch (rrecp->r_opcode) {
 139                         case YXDOMAIN:
 140                                 rclass = C_ANY;
 141                                 rtype = T_ANY;
 142                                 rrecp->r_size = 0;
 143                                 break;
 144                         case NXDOMAIN:
 145                                 rclass = C_NONE;
 146                                 rtype = T_ANY;
 147                                 rrecp->r_size = 0;
 148                                 break;
 149                         case NXRRSET:
 150                                 rclass = C_NONE;
 151                                 rrecp->r_size = 0;
 152                                 break;
 153                         case YXRRSET:
 154                                 if (rrecp->r_size == 0)
 155                                         rclass = C_ANY;
 156                                 break;
 157                         default:
 158                                 fprintf(stderr,
 159                                         "res_mkupdate: incorrect opcode: %d\n",
 160                                         rrecp->r_opcode);
 161                                 fflush(stderr);
 162                                 return (-1);
 163                         }
 164                 } else if (section == S_UPDATE) {
 165                         switch (rrecp->r_opcode) {
 166                         case DELETE:
 167                                 rclass = rrecp->r_size == 0 ? C_ANY : C_NONE;
 168                                 break;
 169                         case ADD:
 170                                 break;
 171                         default:
 172                                 fprintf(stderr,
 173                                         "res_mkupdate: incorrect opcode: %d\n",
 174                                         rrecp->r_opcode);
 175                                 fflush(stderr);
 176                                 return (-1);
 177                         }
 178                 }
 179
 180                 /*
 181                  * XXX  appending default domain to owner name is omitted,
 182                  *      fqdn must be provided
 183                  */
 184                 if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs,
 185                                  lastdnptr)) < 0)
 186                         return (-1);
 187                 cp += n;
 188                 ShrinkBuffer(n + 2*INT16SZ);
 189                 PUTSHORT(rtype, cp);
 190                 PUTSHORT(rclass, cp);
 191                 if (section == S_ZONE) {
 192                         if (numrrs != 1 || rrecp->r_type != T_SOA)
 193                                 return (-3);
 194                         continue;
 195                 }
 196                 ShrinkBuffer(INT32SZ + INT16SZ);
 197                 PUTLONG(rttl, cp);
 198                 sp2 = cp;  /*%< save pointer to length byte */
 199                 cp += INT16SZ;
 200                 if (rrecp->r_size == 0) {
 201                         if (section == S_UPDATE && rclass != C_ANY)
 202                                 return (-1);
 203                         else {
 204                                 PUTSHORT(0, sp2);
 205                                 continue;
 206                         }
 207                 }
 208                 startp = rrecp->r_data;
 209                 endp = startp + rrecp->r_size - 1;
 210                 /* XXX this should be done centrally. */
 211                 switch (rrecp->r_type) {
 212                 case T_A:
 213                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 214                                 return (-1);
 215                         if (!inet_aton(buf2, &ina))
 216                                 return (-1);
 217                         n1 = ntohl(ina.s_addr);
 218                         ShrinkBuffer(INT32SZ);
 219                         PUTLONG(n1, cp);
 220                         break;
 221                 case T_CNAME:
 222                 case T_MB:
 223                 case T_MG:
 224                 case T_MR:
 225                 case T_NS:
 226                 case T_PTR:
 227                 case ns_t_dname:
 228                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 229                                 return (-1);
 230                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 231                         if (n < 0)
 232                                 return (-1);
 233                         cp += n;
 234                         ShrinkBuffer(n);
 235                         break;
 236                 case T_MINFO:
 237                 case T_SOA:
 238                 case T_RP:
 239                         for (i = 0; i < 2; i++) {
 240                                 if (!getword_str(buf2, sizeof buf2, &startp,
 241                                                  endp))
 242                                 return (-1);
 243                                 n = dn_comp(buf2, cp, buflen,
 244                                             dnptrs, lastdnptr);
 245                                 if (n < 0)
 246                                         return (-1);
 247                                 cp += n;
 248                                 ShrinkBuffer(n);
 249                         }
 250                         if (rrecp->r_type == T_SOA) {
 251                                 ShrinkBuffer(5 * INT32SZ);
 252                                 while (isspace(*startp) || !*startp)
 253                                         startp++;
 254                                 if (*startp == '(') {
 255                                         multiline = 1;
 256                                         startp++;
 257                                 } else
 258                                         multiline = 0;
 259                                 /* serial, refresh, retry, expire, minimum */
 260                                 for (i = 0; i < 5; i++) {
 261                                         soanum = getnum_str(&startp, endp);
 262                                         if (soanum < 0)
 263                                                 return (-1);
 264                                         PUTLONG(soanum, cp);
 265                                 }
 266                                 if (multiline) {
 267                                         while (isspace(*startp) || !*startp)
 268                                                 startp++;
 269                                         if (*startp != ')')
 270                                                 return (-1);
 271                                 }
 272                         }
 273                         break;
 274                 case T_MX:
 275                 case T_AFSDB:
 276                 case T_RT:
 277                         n = getnum_str(&startp, endp);
 278                         if (n < 0)
 279                                 return (-1);
 280                         ShrinkBuffer(INT16SZ);
 281                         PUTSHORT(n, cp);
 282                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 283                                 return (-1);
 284                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 285                         if (n < 0)
 286                                 return (-1);
 287                         cp += n;
 288                         ShrinkBuffer(n);
 289                         break;
 290                 case T_SRV:
 291                         n = getnum_str(&startp, endp);
 292                         if (n < 0)
 293                                 return (-1);
 294                         ShrinkBuffer(INT16SZ);
 295                         PUTSHORT(n, cp);
 296
 297                         n = getnum_str(&startp, endp);
 298                         if (n < 0)
 299                                 return (-1);
 300                         ShrinkBuffer(INT16SZ);
 301                         PUTSHORT(n, cp);
 302
 303                         n = getnum_str(&startp, endp);
 304                         if (n < 0)
 305                                 return (-1);
 306                         ShrinkBuffer(INT16SZ);
 307                         PUTSHORT(n, cp);
 308
 309                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 310                                 return (-1);
 311                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 312                         if (n < 0)
 313                                 return (-1);
 314                         cp += n;
 315                         ShrinkBuffer(n);
 316                         break;
 317                 case T_PX:
 318                         n = getnum_str(&startp, endp);
 319                         if (n < 0)
 320                                 return (-1);
 321                         PUTSHORT(n, cp);
 322                         ShrinkBuffer(INT16SZ);
 323                         for (i = 0; i < 2; i++) {
 324                                 if (!getword_str(buf2, sizeof buf2, &startp,
 325                                                  endp))
 326                                         return (-1);
 327                                 n = dn_comp(buf2, cp, buflen, dnptrs,
 328                                             lastdnptr);
 329                                 if (n < 0)
 330                                         return (-1);
 331                                 cp += n;
 332                                 ShrinkBuffer(n);
 333                         }
 334                         break;
 335                 case T_WKS: {
 336                         char bm[MAXPORT/8];
 337                         unsigned int maxbm = 0;
 338
 339                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 340                                 return (-1);
 341                         if (!inet_aton(buf2, &ina))
 342                                 return (-1);
 343                         n1 = ntohl(ina.s_addr);
 344                         ShrinkBuffer(INT32SZ);
 345                         PUTLONG(n1, cp);
 346
 347                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 348                                 return (-1);
 349                         if ((i = res_protocolnumber(buf2)) < 0)
 350                                 return (-1);
 351                         ShrinkBuffer(1);
 352                         *cp++ = i & 0xff;
 353
 354                         for (i = 0; i < MAXPORT/8 ; i++)
 355                                 bm[i] = 0;
 356
 357                         while (getword_str(buf2, sizeof buf2, &startp, endp)) {
 358                                 if ((n = res_servicenumber(buf2)) <= 0)
 359                                         return (-1);
 360
 361                                 if (n < MAXPORT) {
 362                                         bm[n/8] |= (0x80>>(n%8));
 363                                         if ((unsigned)n > maxbm)
 364                                                 maxbm = n;
 365                                 } else
 366                                         return (-1);
 367                         }
 368                         maxbm = maxbm/8 + 1;
 369                         ShrinkBuffer(maxbm);
 370                         memcpy(cp, bm, maxbm);
 371                         cp += maxbm;
 372                         break;
 373                 }
 374                 case T_HINFO:
 375                         for (i = 0; i < 2; i++) {
 376                                 if ((n = getstr_str(buf2, sizeof buf2,
 377                                                 &startp, endp)) < 0)
 378                                         return (-1);
 379                                 if (n > 255)
 380                                         return (-1);
 381                                 ShrinkBuffer(n+1);
 382                                 *cp++ = n;
 383                                 memcpy(cp, buf2, n);
 384                                 cp += n;
 385                         }
 386                         break;
 387                 case T_TXT:
 388                         for (;;) {
 389                                 if ((n = getstr_str(buf2, sizeof buf2,
 390                                                 &startp, endp)) < 0) {
 391                                         if (cp != (sp2 + INT16SZ))
 392                                                 break;
 393                                         return (-1);
 394                                 }
 395                                 if (n > 255)
 396                                         return (-1);
 397                                 ShrinkBuffer(n+1);
 398                                 *cp++ = n;
 399                                 memcpy(cp, buf2, n);
 400                                 cp += n;
 401                         }
 402                         break;
 403                 case T_X25:
 404                         /* RFC1183 */
 405                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 406                                          endp)) < 0)
 407                                 return (-1);
 408                         if (n > 255)
 409                                 return (-1);
 410                         ShrinkBuffer(n+1);
 411                         *cp++ = n;
 412                         memcpy(cp, buf2, n);
 413                         cp += n;
 414                         break;
 415                 case T_ISDN:
 416                         /* RFC1183 */
 417                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 418                                          endp)) < 0)
 419                                 return (-1);
 420                         if ((n > 255) || (n == 0))
 421                                 return (-1);
 422                         ShrinkBuffer(n+1);
 423                         *cp++ = n;
 424                         memcpy(cp, buf2, n);
 425                         cp += n;
 426                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 427                                          endp)) < 0)
 428                                 n = 0;
 429                         if (n > 255)
 430                                 return (-1);
 431                         ShrinkBuffer(n+1);
 432                         *cp++ = n;
 433                         memcpy(cp, buf2, n);
 434                         cp += n;
 435                         break;
 436                 case T_NSAP:
 437                         if ((n = inet_nsap_addr((char *)startp, (u_char *)buf2, sizeof(buf2))) != 0) {
 438                                 ShrinkBuffer(n);
 439                                 memcpy(cp, buf2, n);
 440                                 cp += n;
 441                         } else {
 442                                 return (-1);
 443                         }
 444                         break;
 445                 case T_LOC:
 446                         if ((n = loc_aton((char *)startp, (u_char *)buf2)) != 0) {
 447                                 ShrinkBuffer(n);
 448                                 memcpy(cp, buf2, n);
 449                                 cp += n;
 450                         } else
 451                                 return (-1);
 452                         break;
 453                 case ns_t_sig:
 454                     {
 455                         int sig_type, success, dateerror;
 456                         u_int32_t exptime, timesigned;
 457
 458                         /* type */
 459                         if ((n = getword_str(buf2, sizeof buf2,
 460                                              &startp, endp)) < 0)
 461                                 return (-1);
 462                         sig_type = sym_ston(__p_type_syms, buf2, &success);
 463                         if (!success || sig_type == ns_t_any)
 464                                 return (-1);
 465                         ShrinkBuffer(INT16SZ);
 466                         PUTSHORT(sig_type, cp);
 467                         /* alg */
 468                         n = getnum_str(&startp, endp);
 469                         if (n < 0)
 470                                 return (-1);
 471                         ShrinkBuffer(1);
 472                         *cp++ = n;
 473                         /* labels */
 474                         n = getnum_str(&startp, endp);
 475                         if (n <= 0 || n > 255)
 476                                 return (-1);
 477                         ShrinkBuffer(1);
 478                         *cp++ = n;
 479                         /* ottl  & expire */
 480                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 481                                 return (-1);
 482                         exptime = ns_datetosecs(buf2, &dateerror);
 483                         if (!dateerror) {
 484                                 ShrinkBuffer(INT32SZ);
 485                                 PUTLONG(rttl, cp);
 486                         }
 487                         else {
 488                                 char *ulendp;
 489                                 u_int32_t ottl;
 490
 491                                 errno = 0;
 492                                 ottl = strtoul(buf2, &ulendp, 10);
 493                                 if (errno != 0 ||
 494                                     (ulendp != NULL && *ulendp != '\0'))
 495                                         return (-1);
 496                                 ShrinkBuffer(INT32SZ);
 497                                 PUTLONG(ottl, cp);
 498                                 if (!getword_str(buf2, sizeof buf2, &startp,
 499                                                  endp))
 500                                         return (-1);
 501                                 exptime = ns_datetosecs(buf2, &dateerror);
 502                                 if (dateerror)
 503                                         return (-1);
 504                         }
 505                         /* expire */
 506                         ShrinkBuffer(INT32SZ);
 507                         PUTLONG(exptime, cp);
 508                         /* timesigned */
 509                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 510                                 return (-1);
 511                         timesigned = ns_datetosecs(buf2, &dateerror);
 512                         if (!dateerror) {
 513                                 ShrinkBuffer(INT32SZ);
 514                                 PUTLONG(timesigned, cp);
 515                         }
 516                         else
 517                                 return (-1);
 518                         /* footprint */
 519                         n = getnum_str(&startp, endp);
 520                         if (n < 0)
 521                                 return (-1);
 522                         ShrinkBuffer(INT16SZ);
 523                         PUTSHORT(n, cp);
 524                         /* signer name */
 525                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 526                                 return (-1);
 527                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 528                         if (n < 0)
 529                                 return (-1);
 530                         cp += n;
 531                         ShrinkBuffer(n);
 532                         /* sig */
 533                         if ((n = getword_str(buf2, sizeof buf2,
 534                                              &startp, endp)) < 0)
 535                                 return (-1);
 536                         siglen = b64_pton(buf2, buf3, sizeof(buf3));
 537                         if (siglen < 0)
 538                                 return (-1);
 539                         ShrinkBuffer(siglen);
 540                         memcpy(cp, buf3, siglen);
 541                         cp += siglen;
 542                         break;
 543                     }
 544                 case ns_t_key:
 545                         /* flags */
 546                         n = gethexnum_str(&startp, endp);
 547                         if (n < 0)
 548                                 return (-1);
 549                         ShrinkBuffer(INT16SZ);
 550                         PUTSHORT(n, cp);
 551                         /* proto */
 552                         n = getnum_str(&startp, endp);
 553                         if (n < 0)
 554                                 return (-1);
 555                         ShrinkBuffer(1);
 556                         *cp++ = n;
 557                         /* alg */
 558                         n = getnum_str(&startp, endp);
 559                         if (n < 0)
 560                                 return (-1);
 561                         ShrinkBuffer(1);
 562                         *cp++ = n;
 563                         /* key */
 564                         if ((n = getword_str(buf2, sizeof buf2,
 565                                              &startp, endp)) < 0)
 566                                 return (-1);
 567                         keylen = b64_pton(buf2, buf3, sizeof(buf3));
 568                         if (keylen < 0)
 569                                 return (-1);
 570                         ShrinkBuffer(keylen);
 571                         memcpy(cp, buf3, keylen);
 572                         cp += keylen;
 573                         break;
 574                 case ns_t_nxt:
 575                     {
 576                         int success, nxt_type;
 577                         u_char data[32];
 578                         int maxtype;
 579
 580                         /* next name */
 581                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 582                                 return (-1);
 583                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 584                         if (n < 0)
 585                                 return (-1);
 586                         cp += n;
 587                         ShrinkBuffer(n);
 588                         maxtype = 0;
 589                         memset(data, 0, sizeof data);
 590                         for (;;) {
 591                                 if (!getword_str(buf2, sizeof buf2, &startp,
 592                                                  endp))
 593                                         break;
 594                                 nxt_type = sym_ston(__p_type_syms, buf2,
 595                                                     &success);
 596                                 if (!success || !ns_t_rr_p(nxt_type))
 597                                         return (-1);
 598                                 NS_NXT_BIT_SET(nxt_type, data);
 599                                 if (nxt_type > maxtype)
 600                                         maxtype = nxt_type;
 601                         }
 602                         n = maxtype/NS_NXT_BITS+1;
 603                         ShrinkBuffer(n);
 604                         memcpy(cp, data, n);
 605                         cp += n;
 606                         break;
 607                     }
 608                 case ns_t_cert:
 609                         /* type */
 610                         n = getnum_str(&startp, endp);
 611                         if (n < 0)
 612                                 return (-1);
 613                         ShrinkBuffer(INT16SZ);
 614                         PUTSHORT(n, cp);
 615                         /* key tag */
 616                         n = getnum_str(&startp, endp);
 617                         if (n < 0)
 618                                 return (-1);
 619                         ShrinkBuffer(INT16SZ);
 620                         PUTSHORT(n, cp);
 621                         /* alg */
 622                         n = getnum_str(&startp, endp);
 623                         if (n < 0)
 624                                 return (-1);
 625                         ShrinkBuffer(1);
 626                         *cp++ = n;
 627                         /* cert */
 628                         if ((n = getword_str(buf2, sizeof buf2,
 629                                              &startp, endp)) < 0)
 630                                 return (-1);
 631                         certlen = b64_pton(buf2, buf3, sizeof(buf3));
 632                         if (certlen < 0)
 633                                 return (-1);
 634                         ShrinkBuffer(certlen);
 635                         memcpy(cp, buf3, certlen);
 636                         cp += certlen;
 637                         break;
 638                 case ns_t_aaaa:
 639                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 640                                 return (-1);
 641                         if (inet_pton(AF_INET6, buf2, &in6a) <= 0)
 642                                 return (-1);
 643                         ShrinkBuffer(NS_IN6ADDRSZ);
 644                         memcpy(cp, &in6a, NS_IN6ADDRSZ);
 645                         cp += NS_IN6ADDRSZ;
 646                         break;
 647                 case ns_t_naptr:
 648                         /* Order Preference Flags Service Replacement Regexp */
 649                         /* Order */
 650                         n = getnum_str(&startp, endp);
 651                         if (n < 0 || n > 65535)
 652                                 return (-1);
 653                         ShrinkBuffer(INT16SZ);
 654                         PUTSHORT(n, cp);
 655                         /* Preference */
 656                         n = getnum_str(&startp, endp);
 657                         if (n < 0 || n > 65535)
 658                                 return (-1);
 659                         ShrinkBuffer(INT16SZ);
 660                         PUTSHORT(n, cp);
 661                         /* Flags */
 662                         if ((n = getstr_str(buf2, sizeof buf2,
 663                                         &startp, endp)) < 0) {
 664                                 return (-1);
 665                         }
 666                         if (n > 255)
 667                                 return (-1);
 668                         ShrinkBuffer(n+1);
 669                         *cp++ = n;
 670                         memcpy(cp, buf2, n);
 671                         cp += n;
 672                         /* Service Classes */
 673                         if ((n = getstr_str(buf2, sizeof buf2,
 674                                         &startp, endp)) < 0) {
 675                                 return (-1);
 676                         }
 677                         if (n > 255)
 678                                 return (-1);
 679                         ShrinkBuffer(n+1);
 680                         *cp++ = n;
 681                         memcpy(cp, buf2, n);
 682                         cp += n;
 683                         /* Pattern */
 684                         if ((n = getstr_str(buf2, sizeof buf2,
 685                                         &startp, endp)) < 0) {
 686                                 return (-1);
 687                         }
 688                         if (n > 255)
 689                                 return (-1);
 690                         ShrinkBuffer(n+1);
 691                         *cp++ = n;
 692                         memcpy(cp, buf2, n);
 693                         cp += n;
 694                         /* Replacement */
 695                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 696                                 return (-1);
 697                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 698                         if (n < 0)
 699                                 return (-1);
 700                         cp += n;
 701                         ShrinkBuffer(n);
 702                         break;
 703                 default:
 704                         return (-1);
 705                 } /*switch*/
 706                 n = (u_int16_t)((cp - sp2) - INT16SZ);
 707                 PUTSHORT(n, sp2);
 708         } /*for*/
 709
 710         hp->qdcount = htons(counts[0]);
 711         hp->ancount = htons(counts[1]);
 712         hp->nscount = htons(counts[2]);
 713         hp->arcount = htons(counts[3]);
 714         return (cp - buf);
 715 }
 716
 717 /*%
 718  * Get a whitespace delimited word from a string (not file)
 719  * into buf. modify the start pointer to point after the
 720  * word in the string.
 721  */
 722 static int
 723 getword_str(char *buf, int size, u_char **startpp, u_char *endp) {
 724         char *cp;
 725         int c;
 726
 727         for (cp = buf; *startpp <= endp; ) {
 728                 c = **startpp;
 729                 if (isspace(c) || c == '\0') {
 730                         if (cp != buf) /*%< trailing whitespace */
 731                                 break;
 732                         else { /*%< leading whitespace */
 733                                 (*startpp)++;
 734                                 continue;
 735                         }
 736                 }
 737                 (*startpp)++;
 738                 if (cp >= buf+size-1)
 739                         break;
 740                 *cp++ = (u_char)c;
 741         }
 742         *cp = '\0';
 743         return (cp != buf);
 744 }
 745
 746 /*%
 747  * get a white spae delimited string from memory.  Process quoted strings
 748  * and \\DDD escapes.  Return length or -1 on error.  Returned string may
 749  * contain nulls.
 750  */
 751 static char digits[] = "0123456789";
 752 static int
 753 getstr_str(char *buf, int size, u_char **startpp, u_char *endp) {
 754         char *cp;
 755         int c, c1 = 0;
 756         int inquote = 0;
 757         int seen_quote = 0;
 758         int escape = 0;
 759         int dig = 0;
 760
 761         for (cp = buf; *startpp <= endp; ) {
 762                 if ((c = **startpp) == '\0')
 763                         break;
 764                 /* leading white space */
 765                 if ((cp == buf) && !seen_quote && isspace(c)) {
 766                         (*startpp)++;
 767                         continue;
 768                 }
 769
 770                 switch (c) {
 771                 case '\\':
 772                         if (!escape)  {
 773                                 escape = 1;
 774                                 dig = 0;
 775                                 c1 = 0;
 776                                 (*startpp)++;
 777                                 continue;
 778                         }
 779                         goto do_escape;
 780                 case '"':
 781                         if (!escape) {
 782                                 inquote = !inquote;
 783                                 seen_quote = 1;
 784                                 (*startpp)++;
 785                                 continue;
 786                         }
 787                         /* fall through */
 788                 default:
 789                 do_escape:
 790                         if (escape) {
 791                                 switch (c) {
 792                                 case '0':
 793                                 case '1':
 794                                 case '2':
 795                                 case '3':
 796                                 case '4':
 797                                 case '5':
 798                                 case '6':
 799                                 case '7':
 800                                 case '8':
 801                                 case '9':
 802                                         c1 = c1 * 10 +
 803                                                 (strchr(digits, c) - digits);
 804
 805                                         if (++dig == 3) {
 806                                                 c = c1 &0xff;
 807                                                 break;
 808                                         }
 809                                         (*startpp)++;
 810                                         continue;
 811                                 }
 812                                 escape = 0;
 813                         } else if (!inquote && isspace(c))
 814                                 goto done;
 815                         if (cp >= buf+size-1)
 816                                 goto done;
 817                         *cp++ = (u_char)c;
 818                         (*startpp)++;
 819                 }
 820         }
 821  done:
 822         *cp = '\0';
 823         return ((cp == buf)?  (seen_quote? 0: -1): (cp - buf));
 824 }
 825
 826 /*%
 827  * Get a whitespace delimited base 16 number from a string (not file) into buf
 828  * update the start pointer to point after the number in the string.
 829  */
 830 static int
 831 gethexnum_str(u_char **startpp, u_char *endp) {
 832         int c, n;
 833         int seendigit = 0;
 834         int m = 0;
 835
 836         if (*startpp + 2 >= endp || strncasecmp((char *)*startpp, "0x", 2) != 0)
 837                 return getnum_str(startpp, endp);
 838         (*startpp)+=2;
 839         for (n = 0; *startpp <= endp; ) {
 840                 c = **startpp;
 841                 if (isspace(c) || c == '\0') {
 842                         if (seendigit) /*%< trailing whitespace */
 843                                 break;
 844                         else { /*%< leading whitespace */
 845                                 (*startpp)++;
 846                                 continue;
 847                         }
 848                 }
 849                 if (c == ';') {
 850                         while ((*startpp <= endp) &&
 851                                ((c = **startpp) != '\n'))
 852                                         (*startpp)++;
 853                         if (seendigit)
 854                                 break;
 855                         continue;
 856                 }
 857                 if (!isxdigit(c)) {
 858                         if (c == ')' && seendigit) {
 859                                 (*startpp)--;
 860                                 break;
 861                         }
 862                         return (-1);
 863                 }
 864                 (*startpp)++;
 865                 if (isdigit(c))
 866                         n = n * 16 + (c - '0');
 867                 else
 868                         n = n * 16 + (tolower(c) - 'a' + 10);
 869                 seendigit = 1;
 870         }
 871         return (n + m);
 872 }
 873
 874 /*%
 875  * Get a whitespace delimited base 10 number from a string (not file) into buf
 876  * update the start pointer to point after the number in the string.
 877  */
 878 static int
 879 getnum_str(u_char **startpp, u_char *endp) {
 880         int c, n;
 881         int seendigit = 0;
 882         int m = 0;
 883
 884         for (n = 0; *startpp <= endp; ) {
 885                 c = **startpp;
 886                 if (isspace(c) || c == '\0') {
 887                         if (seendigit) /*%< trailing whitespace */
 888                                 break;
 889                         else { /*%< leading whitespace */
 890                                 (*startpp)++;
 891                                 continue;
 892                         }
 893                 }
 894                 if (c == ';') {
 895                         while ((*startpp <= endp) &&
 896                                ((c = **startpp) != '\n'))
 897                                         (*startpp)++;
 898                         if (seendigit)
 899                                 break;
 900                         continue;
 901                 }
 902                 if (!isdigit(c)) {
 903                         if (c == ')' && seendigit) {
 904                                 (*startpp)--;
 905                                 break;
 906                         }
 907                         return (-1);
 908                 }
 909                 (*startpp)++;
 910                 n = n * 10 + (c - '0');
 911                 seendigit = 1;
 912         }
 913         return (n + m);
 914 }
 915
 916 /*%
 917  * Allocate a resource record buffer & save rr info.
 918  */
 919 ns_updrec *
 920 res_mkupdrec(int section, const char *dname,
 921              u_int class, u_int type, u_long ttl) {
 922         ns_updrec *rrecp = (ns_updrec *)calloc(1, sizeof(ns_updrec));
 923
 924         if (!rrecp || !(rrecp->r_dname = strdup(dname))) {
 925                 if (rrecp)
 926                         free((char *)rrecp);
 927                 return (NULL);
 928         }
 929         INIT_LINK(rrecp, r_link);
 930         INIT_LINK(rrecp, r_glink);
 931         rrecp->r_class = (ns_class)class;
 932         rrecp->r_type = (ns_type)type;
 933         rrecp->r_ttl = ttl;
 934         rrecp->r_section = (ns_sect)section;
 935         return (rrecp);
 936 }
 937
 938 /*%
 939  * Free a resource record buffer created by res_mkupdrec.
 940  */
 941 void
 942 res_freeupdrec(ns_updrec *rrecp) {
 943         /* Note: freeing r_dp is the caller's responsibility. */
 944         if (rrecp->r_dname != NULL)
 945                 free(rrecp->r_dname);
 946         free(rrecp);
 947 }
 948
 949 struct valuelist {
 950         struct valuelist *      next;
 951         struct valuelist *      prev;
 952         char *                  name;
 953         char *                  proto;
 954         int                     port;
 955 };
 956 static struct valuelist *servicelist, *protolist;
 957
 958 static void
 959 res_buildservicelist() {
 960         struct servent *sp;
 961         struct valuelist *slp;
 962
 963 #ifdef MAYBE_HESIOD
 964         setservent(0);
 965 #else
 966         setservent(1);
 967 #endif
 968         while ((sp = getservent()) != NULL) {
 969                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
 970                 if (!slp)
 971                         break;
 972                 slp->name = strdup(sp->s_name);
 973                 slp->proto = strdup(sp->s_proto);
 974                 if ((slp->name == NULL) || (slp->proto == NULL)) {
 975                         if (slp->name) free(slp->name);
 976                         if (slp->proto) free(slp->proto);
 977                         free(slp);
 978                         break;
 979                 }
 980                 slp->port = ntohs((u_int16_t)sp->s_port);  /*%< host byt order */
 981                 slp->next = servicelist;
 982                 slp->prev = NULL;
 983                 if (servicelist)
 984                         servicelist->prev = slp;
 985                 servicelist = slp;
 986         }
 987         endservent();
 988 }
 989
 990 void
 991 res_destroyservicelist() {
 992         struct valuelist *slp, *slp_next;
 993
 994         for (slp = servicelist; slp != NULL; slp = slp_next) {
 995                 slp_next = slp->next;
 996                 free(slp->name);
 997                 free(slp->proto);
 998                 free(slp);
 999         }
1000         servicelist = (struct valuelist *)0;
1001 }
1002
1003 void
1004 res_buildprotolist(void) {
1005         struct protoent *pp;
1006         struct valuelist *slp;
1007
1008 #ifdef MAYBE_HESIOD
1009         setprotoent(0);
1010 #else
1011         setprotoent(1);
1012 #endif
1013         while ((pp = getprotoent()) != NULL) {
1014                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
1015                 if (!slp)
1016                         break;
1017                 slp->name = strdup(pp->p_name);
1018                 if (slp->name == NULL) {
1019                         free(slp);
1020                         break;
1021                 }
1022                 slp->port = pp->p_proto;        /*%< host byte order */
1023                 slp->next = protolist;
1024                 slp->prev = NULL;
1025                 if (protolist)
1026                         protolist->prev = slp;
1027                 protolist = slp;
1028         }
1029         endprotoent();
1030 }
1031
1032 void
1033 res_destroyprotolist(void) {
1034         struct valuelist *plp, *plp_next;
1035
1036         for (plp = protolist; plp != NULL; plp = plp_next) {
1037                 plp_next = plp->next;
1038                 free(plp->name);
1039                 free(plp);
1040         }
1041         protolist = (struct valuelist *)0;
1042 }
1043
1044 static int
1045 findservice(const char *s, struct valuelist **list) {
1046         struct valuelist *lp = *list;
1047         int n;
1048
1049         for (; lp != NULL; lp = lp->next)
1050                 if (strcasecmp(lp->name, s) == 0) {
1051                         if (lp != *list) {
1052                                 lp->prev->next = lp->next;
1053                                 if (lp->next)
1054                                         lp->next->prev = lp->prev;
1055                                 (*list)->prev = lp;
1056                                 lp->next = *list;
1057                                 *list = lp;
1058                         }
1059                         return (lp->port);      /*%< host byte order */
1060                 }
1061         if (sscanf(s, "%d", &n) != 1 || n <= 0)
1062                 n = -1;
1063         return (n);
1064 }
1065
1066 /*%
1067  * Convert service name or (ascii) number to int.
1068  */
1069 int
1070 res_servicenumber(const char *p) {
1071         if (servicelist == (struct valuelist *)0)
1072                 res_buildservicelist();
1073         return (findservice(p, &servicelist));
1074 }
1075
1076 /*%
1077  * Convert protocol name or (ascii) number to int.
1078  */
1079 int
1080 res_protocolnumber(const char *p) {
1081         if (protolist == (struct valuelist *)0)
1082                 res_buildprotolist();
1083         return (findservice(p, &protolist));
1084 }
1085
1086 static struct servent *
1087 cgetservbyport(u_int16_t port, const char *proto) {     /*%< Host byte order. */
1088         struct valuelist **list = &servicelist;
1089         struct valuelist *lp = *list;
1090         static struct servent serv;
1091
1092         port = ntohs(port);
1093         for (; lp != NULL; lp = lp->next) {
1094                 if (port != (u_int16_t)lp->port)        /*%< Host byte order. */
1095                         continue;
1096                 if (strcasecmp(lp->proto, proto) == 0) {
1097                         if (lp != *list) {
1098                                 lp->prev->next = lp->next;
1099                                 if (lp->next)
1100                                         lp->next->prev = lp->prev;
1101                                 (*list)->prev = lp;
1102                                 lp->next = *list;
1103                                 *list = lp;
1104                         }
1105                         serv.s_name = lp->name;
1106                         serv.s_port = htons((u_int16_t)lp->port);
1107                         serv.s_proto = lp->proto;
1108                         return (&serv);
1109                 }
1110         }
1111         return (0);
1112 }
1113
1114 static struct protoent *
1115 cgetprotobynumber(int proto) {                          /*%< Host byte order. */
1116         struct valuelist **list = &protolist;
1117         struct valuelist *lp = *list;
1118         static struct protoent prot;
1119
1120         for (; lp != NULL; lp = lp->next)
1121                 if (lp->port == proto) {                /*%< Host byte order. */
1122                         if (lp != *list) {
1123                                 lp->prev->next = lp->next;
1124                                 if (lp->next)
1125                                         lp->next->prev = lp->prev;
1126                                 (*list)->prev = lp;
1127                                 lp->next = *list;
1128                                 *list = lp;
1129                         }
1130                         prot.p_name = lp->name;
1131                         prot.p_proto = lp->port;        /*%< Host byte order. */
1132                         return (&prot);
1133                 }
1134         return (0);
1135 }
1136
1137 const char *
1138 res_protocolname(int num) {
1139         static char number[8];
1140         struct protoent *pp;
1141
1142         if (protolist == (struct valuelist *)0)
1143                 res_buildprotolist();
1144         pp = cgetprotobynumber(num);
1145         if (pp == 0)  {
1146                 (void) sprintf(number, "%d", num);
1147                 return (number);
1148         }
1149         return (pp->p_name);
1150 }
1151
1152 const char *
1153 res_servicename(u_int16_t port, const char *proto) {    /*%< Host byte order. */
1154         static char number[8];
1155         struct servent *ss;
1156
1157         if (servicelist == (struct valuelist *)0)
1158                 res_buildservicelist();
1159         ss = cgetservbyport(htons(port), proto);
1160         if (ss == 0)  {
1161                 (void) sprintf(number, "%d", port);
1162                 return (number);
1163         }
1164         return (ss->s_name);
1165 }