lib/libc/resolv/res_mkupdate.c

   1 /*-
   2  * SPDX-License-Identifier: ISC
   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 $";
  28 #endif /* not lint */
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include "port_before.h"
  33
  34 #include <sys/param.h>
  35
  36 #include <netinet/in.h>
  37 #include <arpa/nameser.h>
  38 #include <arpa/inet.h>
  39
  40 #include <errno.h>
  41 #include <limits.h>
  42 #include <netdb.h>
  43 #include <resolv.h>
  44 #include <res_update.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <unistd.h>
  49 #include <ctype.h>
  50
  51 #ifdef _LIBC
  52 #include <isc/list.h>
  53 #endif
  54
  55 #include "port_after.h"
  56
  57 /* Options.  Leave them on. */
  58 #ifndef DEBUG
  59 #define DEBUG
  60 #endif
  61 #define MAXPORT 1024
  62
  63 static int getnum_str(u_char **, u_char *);
  64 static int gethexnum_str(u_char **, u_char *);
  65 static int getword_str(char *, int, u_char **, u_char *);
  66 static int getstr_str(char *, int, u_char **, u_char *);
  67
  68 #define ShrinkBuffer(x)  if ((buflen -= x) < 0) return (-2);
  69
  70 /* Forward. */
  71
  72 #ifdef _LIBC
  73 static
  74 #endif
  75 int res_protocolnumber(const char *);
  76 #ifdef _LIBC
  77 static
  78 #endif
  79 int res_servicenumber(const char *);
  80
  81 /*%
  82  * Form update packets.
  83  * Returns the size of the resulting packet if no error
  84  *
  85  * On error,
  86  *      returns
  87  *\li              -1 if error in reading a word/number in rdata
  88  *                 portion for update packets
  89  *\li           -2 if length of buffer passed is insufficient
  90  *\li           -3 if zone section is not the first section in
  91  *                 the linked list, or section order has a problem
  92  *\li           -4 on a number overflow
  93  *\li           -5 unknown operation or no records
  94  */
  95 int
  96 res_nmkupdate(res_state statp, ns_updrec *rrecp_in, u_char *buf, int buflen) {
  97         ns_updrec *rrecp_start = rrecp_in;
  98         HEADER *hp;
  99         u_char *cp, *sp2, *startp, *endp;
 100         int n, i, soanum, multiline;
 101         ns_updrec *rrecp;
 102         struct in_addr ina;
 103         struct in6_addr in6a;
 104         char buf2[MAXDNAME];
 105         u_char buf3[MAXDNAME];
 106         int section, numrrs = 0, counts[ns_s_max];
 107         u_int16_t rtype, rclass;
 108         u_int32_t n1, rttl;
 109         u_char *dnptrs[20], **dpp, **lastdnptr;
 110 #ifndef _LIBC
 111         int siglen;
 112 #endif
 113         int keylen, certlen;
 114
 115         /*
 116          * Initialize header fields.
 117          */
 118         if ((buf == NULL) || (buflen < HFIXEDSZ))
 119                 return (-1);
 120         memset(buf, 0, HFIXEDSZ);
 121         hp = (HEADER *) buf;
 122         statp->id = res_nrandomid(statp);
 123         hp->id = htons(statp->id);
 124         hp->opcode = ns_o_update;
 125         hp->rcode = NOERROR;
 126         cp = buf + HFIXEDSZ;
 127         buflen -= HFIXEDSZ;
 128         dpp = dnptrs;
 129         *dpp++ = buf;
 130         *dpp++ = NULL;
 131         lastdnptr = dnptrs + nitems(dnptrs);
 132
 133         if (rrecp_start == NULL)
 134                 return (-5);
 135         else if (rrecp_start->r_section != S_ZONE)
 136                 return (-3);
 137
 138         memset(counts, 0, sizeof counts);
 139         for (rrecp = rrecp_start; rrecp; rrecp = NEXT(rrecp, r_glink)) {
 140                 numrrs++;
 141                 section = rrecp->r_section;
 142                 if (section < 0 || section >= ns_s_max)
 143                         return (-1);
 144                 counts[section]++;
 145                 for (i = section + 1; i < ns_s_max; i++)
 146                         if (counts[i])
 147                                 return (-3);
 148                 rtype = rrecp->r_type;
 149                 rclass = rrecp->r_class;
 150                 rttl = rrecp->r_ttl;
 151                 /* overload class and type */
 152                 if (section == S_PREREQ) {
 153                         rttl = 0;
 154                         switch (rrecp->r_opcode) {
 155                         case YXDOMAIN:
 156                                 rclass = C_ANY;
 157                                 rtype = T_ANY;
 158                                 rrecp->r_size = 0;
 159                                 break;
 160                         case NXDOMAIN:
 161                                 rclass = C_NONE;
 162                                 rtype = T_ANY;
 163                                 rrecp->r_size = 0;
 164                                 break;
 165                         case NXRRSET:
 166                                 rclass = C_NONE;
 167                                 rrecp->r_size = 0;
 168                                 break;
 169                         case YXRRSET:
 170                                 if (rrecp->r_size == 0)
 171                                         rclass = C_ANY;
 172                                 break;
 173                         default:
 174                                 fprintf(stderr,
 175                                         "res_mkupdate: incorrect opcode: %d\n",
 176                                         rrecp->r_opcode);
 177                                 fflush(stderr);
 178                                 return (-1);
 179                         }
 180                 } else if (section == S_UPDATE) {
 181                         switch (rrecp->r_opcode) {
 182                         case DELETE:
 183                                 rclass = rrecp->r_size == 0 ? C_ANY : C_NONE;
 184                                 break;
 185                         case ADD:
 186                                 break;
 187                         default:
 188                                 fprintf(stderr,
 189                                         "res_mkupdate: incorrect opcode: %d\n",
 190                                         rrecp->r_opcode);
 191                                 fflush(stderr);
 192                                 return (-1);
 193                         }
 194                 }
 195
 196                 /*
 197                  * XXX  appending default domain to owner name is omitted,
 198                  *      fqdn must be provided
 199                  */
 200                 if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs,
 201                                  lastdnptr)) < 0)
 202                         return (-1);
 203                 cp += n;
 204                 ShrinkBuffer(n + 2*INT16SZ);
 205                 PUTSHORT(rtype, cp);
 206                 PUTSHORT(rclass, cp);
 207                 if (section == S_ZONE) {
 208                         if (numrrs != 1 || rrecp->r_type != T_SOA)
 209                                 return (-3);
 210                         continue;
 211                 }
 212                 ShrinkBuffer(INT32SZ + INT16SZ);
 213                 PUTLONG(rttl, cp);
 214                 sp2 = cp;  /*%< save pointer to length byte */
 215                 cp += INT16SZ;
 216                 if (rrecp->r_size == 0) {
 217                         if (section == S_UPDATE && rclass != C_ANY)
 218                                 return (-1);
 219                         else {
 220                                 PUTSHORT(0, sp2);
 221                                 continue;
 222                         }
 223                 }
 224                 startp = rrecp->r_data;
 225                 endp = startp + rrecp->r_size - 1;
 226                 /* XXX this should be done centrally. */
 227                 switch (rrecp->r_type) {
 228                 case T_A:
 229                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 230                                 return (-1);
 231                         if (!inet_aton(buf2, &ina))
 232                                 return (-1);
 233                         n1 = ntohl(ina.s_addr);
 234                         ShrinkBuffer(INT32SZ);
 235                         PUTLONG(n1, cp);
 236                         break;
 237                 case T_CNAME:
 238                 case T_MB:
 239                 case T_MG:
 240                 case T_MR:
 241                 case T_NS:
 242                 case T_PTR:
 243                 case ns_t_dname:
 244                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 245                                 return (-1);
 246                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 247                         if (n < 0)
 248                                 return (-1);
 249                         cp += n;
 250                         ShrinkBuffer(n);
 251                         break;
 252                 case T_MINFO:
 253                 case T_SOA:
 254                 case T_RP:
 255                         for (i = 0; i < 2; i++) {
 256                                 if (!getword_str(buf2, sizeof buf2, &startp,
 257                                                  endp))
 258                                 return (-1);
 259                                 n = dn_comp(buf2, cp, buflen,
 260                                             dnptrs, lastdnptr);
 261                                 if (n < 0)
 262                                         return (-1);
 263                                 cp += n;
 264                                 ShrinkBuffer(n);
 265                         }
 266                         if (rrecp->r_type == T_SOA) {
 267                                 ShrinkBuffer(5 * INT32SZ);
 268                                 while (isspace(*startp) || !*startp)
 269                                         startp++;
 270                                 if (*startp == '(') {
 271                                         multiline = 1;
 272                                         startp++;
 273                                 } else
 274                                         multiline = 0;
 275                                 /* serial, refresh, retry, expire, minimum */
 276                                 for (i = 0; i < 5; i++) {
 277                                         soanum = getnum_str(&startp, endp);
 278                                         if (soanum < 0)
 279                                                 return (-1);
 280                                         PUTLONG(soanum, cp);
 281                                 }
 282                                 if (multiline) {
 283                                         while (isspace(*startp) || !*startp)
 284                                                 startp++;
 285                                         if (*startp != ')')
 286                                                 return (-1);
 287                                 }
 288                         }
 289                         break;
 290                 case T_MX:
 291                 case T_AFSDB:
 292                 case T_RT:
 293                         n = getnum_str(&startp, endp);
 294                         if (n < 0)
 295                                 return (-1);
 296                         ShrinkBuffer(INT16SZ);
 297                         PUTSHORT(n, cp);
 298                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 299                                 return (-1);
 300                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 301                         if (n < 0)
 302                                 return (-1);
 303                         cp += n;
 304                         ShrinkBuffer(n);
 305                         break;
 306                 case T_SRV:
 307                         n = getnum_str(&startp, endp);
 308                         if (n < 0)
 309                                 return (-1);
 310                         ShrinkBuffer(INT16SZ);
 311                         PUTSHORT(n, cp);
 312
 313                         n = getnum_str(&startp, endp);
 314                         if (n < 0)
 315                                 return (-1);
 316                         ShrinkBuffer(INT16SZ);
 317                         PUTSHORT(n, cp);
 318
 319                         n = getnum_str(&startp, endp);
 320                         if (n < 0)
 321                                 return (-1);
 322                         ShrinkBuffer(INT16SZ);
 323                         PUTSHORT(n, cp);
 324
 325                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 326                                 return (-1);
 327                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 328                         if (n < 0)
 329                                 return (-1);
 330                         cp += n;
 331                         ShrinkBuffer(n);
 332                         break;
 333                 case T_PX:
 334                         n = getnum_str(&startp, endp);
 335                         if (n < 0)
 336                                 return (-1);
 337                         PUTSHORT(n, cp);
 338                         ShrinkBuffer(INT16SZ);
 339                         for (i = 0; i < 2; i++) {
 340                                 if (!getword_str(buf2, sizeof buf2, &startp,
 341                                                  endp))
 342                                         return (-1);
 343                                 n = dn_comp(buf2, cp, buflen, dnptrs,
 344                                             lastdnptr);
 345                                 if (n < 0)
 346                                         return (-1);
 347                                 cp += n;
 348                                 ShrinkBuffer(n);
 349                         }
 350                         break;
 351                 case T_WKS: {
 352                         char bm[MAXPORT/8];
 353                         unsigned int maxbm = 0;
 354
 355                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 356                                 return (-1);
 357                         if (!inet_aton(buf2, &ina))
 358                                 return (-1);
 359                         n1 = ntohl(ina.s_addr);
 360                         ShrinkBuffer(INT32SZ);
 361                         PUTLONG(n1, cp);
 362
 363                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 364                                 return (-1);
 365                         if ((i = res_protocolnumber(buf2)) < 0)
 366                                 return (-1);
 367                         ShrinkBuffer(1);
 368                         *cp++ = i & 0xff;
 369
 370                         for (i = 0; i < MAXPORT/8 ; i++)
 371                                 bm[i] = 0;
 372
 373                         while (getword_str(buf2, sizeof buf2, &startp, endp)) {
 374                                 if ((n = res_servicenumber(buf2)) <= 0)
 375                                         return (-1);
 376
 377                                 if (n < MAXPORT) {
 378                                         bm[n/8] |= (0x80>>(n%8));
 379                                         if ((unsigned)n > maxbm)
 380                                                 maxbm = n;
 381                                 } else
 382                                         return (-1);
 383                         }
 384                         maxbm = maxbm/8 + 1;
 385                         ShrinkBuffer(maxbm);
 386                         memcpy(cp, bm, maxbm);
 387                         cp += maxbm;
 388                         break;
 389                 }
 390                 case T_HINFO:
 391                         for (i = 0; i < 2; i++) {
 392                                 if ((n = getstr_str(buf2, sizeof buf2,
 393                                                 &startp, endp)) < 0)
 394                                         return (-1);
 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_TXT:
 404                         for (;;) {
 405                                 if ((n = getstr_str(buf2, sizeof buf2,
 406                                                 &startp, endp)) < 0) {
 407                                         if (cp != (sp2 + INT16SZ))
 408                                                 break;
 409                                         return (-1);
 410                                 }
 411                                 if (n > 255)
 412                                         return (-1);
 413                                 ShrinkBuffer(n+1);
 414                                 *cp++ = n;
 415                                 memcpy(cp, buf2, n);
 416                                 cp += n;
 417                         }
 418                         break;
 419                 case T_X25:
 420                         /* RFC1183 */
 421                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 422                                          endp)) < 0)
 423                                 return (-1);
 424                         if (n > 255)
 425                                 return (-1);
 426                         ShrinkBuffer(n+1);
 427                         *cp++ = n;
 428                         memcpy(cp, buf2, n);
 429                         cp += n;
 430                         break;
 431                 case T_ISDN:
 432                         /* RFC1183 */
 433                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 434                                          endp)) < 0)
 435                                 return (-1);
 436                         if ((n > 255) || (n == 0))
 437                                 return (-1);
 438                         ShrinkBuffer(n+1);
 439                         *cp++ = n;
 440                         memcpy(cp, buf2, n);
 441                         cp += n;
 442                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 443                                          endp)) < 0)
 444                                 n = 0;
 445                         if (n > 255)
 446                                 return (-1);
 447                         ShrinkBuffer(n+1);
 448                         *cp++ = n;
 449                         memcpy(cp, buf2, n);
 450                         cp += n;
 451                         break;
 452                 case T_NSAP:
 453                         if ((n = inet_nsap_addr((char *)startp, (u_char *)buf2, sizeof(buf2))) != 0) {
 454                                 ShrinkBuffer(n);
 455                                 memcpy(cp, buf2, n);
 456                                 cp += n;
 457                         } else {
 458                                 return (-1);
 459                         }
 460                         break;
 461                 case T_LOC:
 462                         if ((n = loc_aton((char *)startp, (u_char *)buf2)) != 0) {
 463                                 ShrinkBuffer(n);
 464                                 memcpy(cp, buf2, n);
 465                                 cp += n;
 466                         } else
 467                                 return (-1);
 468                         break;
 469                 case ns_t_sig:
 470 #ifdef _LIBC
 471                         return (-1);
 472 #else
 473                     {
 474                         int sig_type, success, dateerror;
 475                         u_int32_t exptime, timesigned;
 476
 477                         /* type */
 478                         if ((n = getword_str(buf2, sizeof buf2,
 479                                              &startp, endp)) < 0)
 480                                 return (-1);
 481                         sig_type = sym_ston(__p_type_syms, buf2, &success);
 482                         if (!success || sig_type == ns_t_any)
 483                                 return (-1);
 484                         ShrinkBuffer(INT16SZ);
 485                         PUTSHORT(sig_type, cp);
 486                         /* alg */
 487                         n = getnum_str(&startp, endp);
 488                         if (n < 0)
 489                                 return (-1);
 490                         ShrinkBuffer(1);
 491                         *cp++ = n;
 492                         /* labels */
 493                         n = getnum_str(&startp, endp);
 494                         if (n <= 0 || n > 255)
 495                                 return (-1);
 496                         ShrinkBuffer(1);
 497                         *cp++ = n;
 498                         /* ottl  & expire */
 499                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 500                                 return (-1);
 501                         exptime = ns_datetosecs(buf2, &dateerror);
 502                         if (!dateerror) {
 503                                 ShrinkBuffer(INT32SZ);
 504                                 PUTLONG(rttl, cp);
 505                         }
 506                         else {
 507                                 char *ulendp;
 508                                 u_int32_t ottl;
 509
 510                                 errno = 0;
 511                                 ottl = strtoul(buf2, &ulendp, 10);
 512                                 if (errno != 0 ||
 513                                     (ulendp != NULL && *ulendp != '\0'))
 514                                         return (-1);
 515                                 ShrinkBuffer(INT32SZ);
 516                                 PUTLONG(ottl, cp);
 517                                 if (!getword_str(buf2, sizeof buf2, &startp,
 518                                                  endp))
 519                                         return (-1);
 520                                 exptime = ns_datetosecs(buf2, &dateerror);
 521                                 if (dateerror)
 522                                         return (-1);
 523                         }
 524                         /* expire */
 525                         ShrinkBuffer(INT32SZ);
 526                         PUTLONG(exptime, cp);
 527                         /* timesigned */
 528                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 529                                 return (-1);
 530                         timesigned = ns_datetosecs(buf2, &dateerror);
 531                         if (!dateerror) {
 532                                 ShrinkBuffer(INT32SZ);
 533                                 PUTLONG(timesigned, cp);
 534                         }
 535                         else
 536                                 return (-1);
 537                         /* footprint */
 538                         n = getnum_str(&startp, endp);
 539                         if (n < 0)
 540                                 return (-1);
 541                         ShrinkBuffer(INT16SZ);
 542                         PUTSHORT(n, cp);
 543                         /* signer name */
 544                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 545                                 return (-1);
 546                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 547                         if (n < 0)
 548                                 return (-1);
 549                         cp += n;
 550                         ShrinkBuffer(n);
 551                         /* sig */
 552                         if ((n = getword_str(buf2, sizeof buf2,
 553                                              &startp, endp)) < 0)
 554                                 return (-1);
 555                         siglen = b64_pton(buf2, buf3, sizeof(buf3));
 556                         if (siglen < 0)
 557                                 return (-1);
 558                         ShrinkBuffer(siglen);
 559                         memcpy(cp, buf3, siglen);
 560                         cp += siglen;
 561                         break;
 562                     }
 563 #endif
 564                 case ns_t_key:
 565                         /* flags */
 566                         n = gethexnum_str(&startp, endp);
 567                         if (n < 0)
 568                                 return (-1);
 569                         ShrinkBuffer(INT16SZ);
 570                         PUTSHORT(n, cp);
 571                         /* proto */
 572                         n = getnum_str(&startp, endp);
 573                         if (n < 0)
 574                                 return (-1);
 575                         ShrinkBuffer(1);
 576                         *cp++ = n;
 577                         /* alg */
 578                         n = getnum_str(&startp, endp);
 579                         if (n < 0)
 580                                 return (-1);
 581                         ShrinkBuffer(1);
 582                         *cp++ = n;
 583                         /* key */
 584                         if ((n = getword_str(buf2, sizeof buf2,
 585                                              &startp, endp)) < 0)
 586                                 return (-1);
 587                         keylen = b64_pton(buf2, buf3, sizeof(buf3));
 588                         if (keylen < 0)
 589                                 return (-1);
 590                         ShrinkBuffer(keylen);
 591                         memcpy(cp, buf3, keylen);
 592                         cp += keylen;
 593                         break;
 594                 case ns_t_nxt:
 595                     {
 596                         int success, nxt_type;
 597                         u_char data[32];
 598                         int maxtype;
 599
 600                         /* next name */
 601                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 602                                 return (-1);
 603                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 604                         if (n < 0)
 605                                 return (-1);
 606                         cp += n;
 607                         ShrinkBuffer(n);
 608                         maxtype = 0;
 609                         memset(data, 0, sizeof data);
 610                         for (;;) {
 611                                 if (!getword_str(buf2, sizeof buf2, &startp,
 612                                                  endp))
 613                                         break;
 614                                 nxt_type = sym_ston(__p_type_syms, buf2,
 615                                                     &success);
 616                                 if (!success || !ns_t_rr_p(nxt_type))
 617                                         return (-1);
 618                                 NS_NXT_BIT_SET(nxt_type, data);
 619                                 if (nxt_type > maxtype)
 620                                         maxtype = nxt_type;
 621                         }
 622                         n = maxtype/NS_NXT_BITS+1;
 623                         ShrinkBuffer(n);
 624                         memcpy(cp, data, n);
 625                         cp += n;
 626                         break;
 627                     }
 628                 case ns_t_cert:
 629                         /* type */
 630                         n = getnum_str(&startp, endp);
 631                         if (n < 0)
 632                                 return (-1);
 633                         ShrinkBuffer(INT16SZ);
 634                         PUTSHORT(n, cp);
 635                         /* key tag */
 636                         n = getnum_str(&startp, endp);
 637                         if (n < 0)
 638                                 return (-1);
 639                         ShrinkBuffer(INT16SZ);
 640                         PUTSHORT(n, cp);
 641                         /* alg */
 642                         n = getnum_str(&startp, endp);
 643                         if (n < 0)
 644                                 return (-1);
 645                         ShrinkBuffer(1);
 646                         *cp++ = n;
 647                         /* cert */
 648                         if ((n = getword_str(buf2, sizeof buf2,
 649                                              &startp, endp)) < 0)
 650                                 return (-1);
 651                         certlen = b64_pton(buf2, buf3, sizeof(buf3));
 652                         if (certlen < 0)
 653                                 return (-1);
 654                         ShrinkBuffer(certlen);
 655                         memcpy(cp, buf3, certlen);
 656                         cp += certlen;
 657                         break;
 658                 case ns_t_aaaa:
 659                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 660                                 return (-1);
 661                         if (inet_pton(AF_INET6, buf2, &in6a) <= 0)
 662                                 return (-1);
 663                         ShrinkBuffer(NS_IN6ADDRSZ);
 664                         memcpy(cp, &in6a, NS_IN6ADDRSZ);
 665                         cp += NS_IN6ADDRSZ;
 666                         break;
 667                 case ns_t_naptr:
 668                         /* Order Preference Flags Service Replacement Regexp */
 669                         /* Order */
 670                         n = getnum_str(&startp, endp);
 671                         if (n < 0 || n > 65535)
 672                                 return (-1);
 673                         ShrinkBuffer(INT16SZ);
 674                         PUTSHORT(n, cp);
 675                         /* Preference */
 676                         n = getnum_str(&startp, endp);
 677                         if (n < 0 || n > 65535)
 678                                 return (-1);
 679                         ShrinkBuffer(INT16SZ);
 680                         PUTSHORT(n, cp);
 681                         /* Flags */
 682                         if ((n = getstr_str(buf2, sizeof buf2,
 683                                         &startp, endp)) < 0) {
 684                                 return (-1);
 685                         }
 686                         if (n > 255)
 687                                 return (-1);
 688                         ShrinkBuffer(n+1);
 689                         *cp++ = n;
 690                         memcpy(cp, buf2, n);
 691                         cp += n;
 692                         /* Service Classes */
 693                         if ((n = getstr_str(buf2, sizeof buf2,
 694                                         &startp, endp)) < 0) {
 695                                 return (-1);
 696                         }
 697                         if (n > 255)
 698                                 return (-1);
 699                         ShrinkBuffer(n+1);
 700                         *cp++ = n;
 701                         memcpy(cp, buf2, n);
 702                         cp += n;
 703                         /* Pattern */
 704                         if ((n = getstr_str(buf2, sizeof buf2,
 705                                         &startp, endp)) < 0) {
 706                                 return (-1);
 707                         }
 708                         if (n > 255)
 709                                 return (-1);
 710                         ShrinkBuffer(n+1);
 711                         *cp++ = n;
 712                         memcpy(cp, buf2, n);
 713                         cp += n;
 714                         /* Replacement */
 715                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 716                                 return (-1);
 717                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 718                         if (n < 0)
 719                                 return (-1);
 720                         cp += n;
 721                         ShrinkBuffer(n);
 722                         break;
 723                 default:
 724                         return (-1);
 725                 } /*switch*/
 726                 n = (u_int16_t)((cp - sp2) - INT16SZ);
 727                 PUTSHORT(n, sp2);
 728         } /*for*/
 729
 730         hp->qdcount = htons(counts[0]);
 731         hp->ancount = htons(counts[1]);
 732         hp->nscount = htons(counts[2]);
 733         hp->arcount = htons(counts[3]);
 734         return (cp - buf);
 735 }
 736
 737 /*%
 738  * Get a whitespace delimited word from a string (not file)
 739  * into buf. modify the start pointer to point after the
 740  * word in the string.
 741  */
 742 static int
 743 getword_str(char *buf, int size, u_char **startpp, u_char *endp) {
 744         char *cp;
 745         int c;
 746
 747         for (cp = buf; *startpp <= endp; ) {
 748                 c = **startpp;
 749                 if (isspace(c) || c == '\0') {
 750                         if (cp != buf) /*%< trailing whitespace */
 751                                 break;
 752                         else { /*%< leading whitespace */
 753                                 (*startpp)++;
 754                                 continue;
 755                         }
 756                 }
 757                 (*startpp)++;
 758                 if (cp >= buf+size-1)
 759                         break;
 760                 *cp++ = (u_char)c;
 761         }
 762         *cp = '\0';
 763         return (cp != buf);
 764 }
 765
 766 /*%
 767  * get a white spae delimited string from memory.  Process quoted strings
 768  * and \\DDD escapes.  Return length or -1 on error.  Returned string may
 769  * contain nulls.
 770  */
 771 static char digits[] = "0123456789";
 772 static int
 773 getstr_str(char *buf, int size, u_char **startpp, u_char *endp) {
 774         char *cp;
 775         int c, c1 = 0;
 776         int inquote = 0;
 777         int seen_quote = 0;
 778         int escape = 0;
 779         int dig = 0;
 780
 781         for (cp = buf; *startpp <= endp; ) {
 782                 if ((c = **startpp) == '\0')
 783                         break;
 784                 /* leading white space */
 785                 if ((cp == buf) && !seen_quote && isspace(c)) {
 786                         (*startpp)++;
 787                         continue;
 788                 }
 789
 790                 switch (c) {
 791                 case '\\':
 792                         if (!escape)  {
 793                                 escape = 1;
 794                                 dig = 0;
 795                                 c1 = 0;
 796                                 (*startpp)++;
 797                                 continue;
 798                         }
 799                         goto do_escape;
 800                 case '"':
 801                         if (!escape) {
 802                                 inquote = !inquote;
 803                                 seen_quote = 1;
 804                                 (*startpp)++;
 805                                 continue;
 806                         }
 807                         /* fall through */
 808                 default:
 809                 do_escape:
 810                         if (escape) {
 811                                 switch (c) {
 812                                 case '0':
 813                                 case '1':
 814                                 case '2':
 815                                 case '3':
 816                                 case '4':
 817                                 case '5':
 818                                 case '6':
 819                                 case '7':
 820                                 case '8':
 821                                 case '9':
 822                                         c1 = c1 * 10 +
 823                                                 (strchr(digits, c) - digits);
 824
 825                                         if (++dig == 3) {
 826                                                 c = c1 &0xff;
 827                                                 break;
 828                                         }
 829                                         (*startpp)++;
 830                                         continue;
 831                                 }
 832                                 escape = 0;
 833                         } else if (!inquote && isspace(c))
 834                                 goto done;
 835                         if (cp >= buf+size-1)
 836                                 goto done;
 837                         *cp++ = (u_char)c;
 838                         (*startpp)++;
 839                 }
 840         }
 841  done:
 842         *cp = '\0';
 843         return ((cp == buf)?  (seen_quote? 0: -1): (cp - buf));
 844 }
 845
 846 /*%
 847  * Get a whitespace delimited base 16 number from a string (not file) into buf
 848  * update the start pointer to point after the number in the string.
 849  */
 850 static int
 851 gethexnum_str(u_char **startpp, u_char *endp) {
 852         int c, n;
 853         int seendigit = 0;
 854         int m = 0;
 855
 856         if (*startpp + 2 >= endp || strncasecmp((char *)*startpp, "0x", 2) != 0)
 857                 return getnum_str(startpp, endp);
 858         (*startpp)+=2;
 859         for (n = 0; *startpp <= endp; ) {
 860                 c = **startpp;
 861                 if (isspace(c) || c == '\0') {
 862                         if (seendigit) /*%< trailing whitespace */
 863                                 break;
 864                         else { /*%< leading whitespace */
 865                                 (*startpp)++;
 866                                 continue;
 867                         }
 868                 }
 869                 if (c == ';') {
 870                         while ((*startpp <= endp) &&
 871                                ((c = **startpp) != '\n'))
 872                                         (*startpp)++;
 873                         if (seendigit)
 874                                 break;
 875                         continue;
 876                 }
 877                 if (!isxdigit(c)) {
 878                         if (c == ')' && seendigit) {
 879                                 (*startpp)--;
 880                                 break;
 881                         }
 882                         return (-1);
 883                 }
 884                 (*startpp)++;
 885                 if (isdigit(c))
 886                         n = n * 16 + (c - '0');
 887                 else
 888                         n = n * 16 + (tolower(c) - 'a' + 10);
 889                 seendigit = 1;
 890         }
 891         return (n + m);
 892 }
 893
 894 /*%
 895  * Get a whitespace delimited base 10 number from a string (not file) into buf
 896  * update the start pointer to point after the number in the string.
 897  */
 898 static int
 899 getnum_str(u_char **startpp, u_char *endp) {
 900         int c, n;
 901         int seendigit = 0;
 902         int m = 0;
 903
 904         for (n = 0; *startpp <= endp; ) {
 905                 c = **startpp;
 906                 if (isspace(c) || c == '\0') {
 907                         if (seendigit) /*%< trailing whitespace */
 908                                 break;
 909                         else { /*%< leading whitespace */
 910                                 (*startpp)++;
 911                                 continue;
 912                         }
 913                 }
 914                 if (c == ';') {
 915                         while ((*startpp <= endp) &&
 916                                ((c = **startpp) != '\n'))
 917                                         (*startpp)++;
 918                         if (seendigit)
 919                                 break;
 920                         continue;
 921                 }
 922                 if (!isdigit(c)) {
 923                         if (c == ')' && seendigit) {
 924                                 (*startpp)--;
 925                                 break;
 926                         }
 927                         return (-1);
 928                 }
 929                 (*startpp)++;
 930                 n = n * 10 + (c - '0');
 931                 seendigit = 1;
 932         }
 933         return (n + m);
 934 }
 935
 936 /*%
 937  * Allocate a resource record buffer & save rr info.
 938  */
 939 ns_updrec *
 940 res_mkupdrec(int section, const char *dname,
 941              u_int class, u_int type, u_long ttl) {
 942         ns_updrec *rrecp = (ns_updrec *)calloc(1, sizeof(ns_updrec));
 943
 944         if (!rrecp || !(rrecp->r_dname = strdup(dname))) {
 945                 if (rrecp)
 946                         free((char *)rrecp);
 947                 return (NULL);
 948         }
 949         INIT_LINK(rrecp, r_link);
 950         INIT_LINK(rrecp, r_glink);
 951         rrecp->r_class = (ns_class)class;
 952         rrecp->r_type = (ns_type)type;
 953         rrecp->r_ttl = ttl;
 954         rrecp->r_section = (ns_sect)section;
 955         return (rrecp);
 956 }
 957
 958 /*%
 959  * Free a resource record buffer created by res_mkupdrec.
 960  */
 961 void
 962 res_freeupdrec(ns_updrec *rrecp) {
 963         /* Note: freeing r_dp is the caller's responsibility. */
 964         if (rrecp->r_dname != NULL)
 965                 free(rrecp->r_dname);
 966         free(rrecp);
 967 }
 968
 969 struct valuelist {
 970         struct valuelist *      next;
 971         struct valuelist *      prev;
 972         char *                  name;
 973         char *                  proto;
 974         int                     port;
 975 };
 976 static struct valuelist *servicelist, *protolist;
 977
 978 static void
 979 res_buildservicelist(void) {
 980         struct servent *sp;
 981         struct valuelist *slp;
 982
 983 #ifdef MAYBE_HESIOD
 984         setservent(0);
 985 #else
 986         setservent(1);
 987 #endif
 988         while ((sp = getservent()) != NULL) {
 989                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
 990                 if (!slp)
 991                         break;
 992                 slp->name = strdup(sp->s_name);
 993                 slp->proto = strdup(sp->s_proto);
 994                 if ((slp->name == NULL) || (slp->proto == NULL)) {
 995                         if (slp->name) free(slp->name);
 996                         if (slp->proto) free(slp->proto);
 997                         free(slp);
 998                         break;
 999                 }
1000                 slp->port = ntohs((u_int16_t)sp->s_port);  /*%< host byt order */
1001                 slp->next = servicelist;
1002                 slp->prev = NULL;
1003                 if (servicelist)
1004                         servicelist->prev = slp;
1005                 servicelist = slp;
1006         }
1007         endservent();
1008 }
1009
1010 #ifndef _LIBC
1011 void
1012 res_destroyservicelist() {
1013         struct valuelist *slp, *slp_next;
1014
1015         for (slp = servicelist; slp != NULL; slp = slp_next) {
1016                 slp_next = slp->next;
1017                 free(slp->name);
1018                 free(slp->proto);
1019                 free(slp);
1020         }
1021         servicelist = (struct valuelist *)0;
1022 }
1023 #endif
1024
1025 #ifdef _LIBC
1026 static
1027 #endif
1028 void
1029 res_buildprotolist(void) {
1030         struct protoent *pp;
1031         struct valuelist *slp;
1032
1033 #ifdef MAYBE_HESIOD
1034         setprotoent(0);
1035 #else
1036         setprotoent(1);
1037 #endif
1038         while ((pp = getprotoent()) != NULL) {
1039                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
1040                 if (!slp)
1041                         break;
1042                 slp->name = strdup(pp->p_name);
1043                 if (slp->name == NULL) {
1044                         free(slp);
1045                         break;
1046                 }
1047                 slp->port = pp->p_proto;        /*%< host byte order */
1048                 slp->next = protolist;
1049                 slp->prev = NULL;
1050                 if (protolist)
1051                         protolist->prev = slp;
1052                 protolist = slp;
1053         }
1054         endprotoent();
1055 }
1056
1057 #ifndef _LIBC
1058 void
1059 res_destroyprotolist(void) {
1060         struct valuelist *plp, *plp_next;
1061
1062         for (plp = protolist; plp != NULL; plp = plp_next) {
1063                 plp_next = plp->next;
1064                 free(plp->name);
1065                 free(plp);
1066         }
1067         protolist = (struct valuelist *)0;
1068 }
1069 #endif
1070
1071 static int
1072 findservice(const char *s, struct valuelist **list) {
1073         struct valuelist *lp = *list;
1074         int n;
1075
1076         for (; lp != NULL; lp = lp->next)
1077                 if (strcasecmp(lp->name, s) == 0) {
1078                         if (lp != *list) {
1079                                 lp->prev->next = lp->next;
1080                                 if (lp->next)
1081                                         lp->next->prev = lp->prev;
1082                                 (*list)->prev = lp;
1083                                 lp->next = *list;
1084                                 *list = lp;
1085                         }
1086                         return (lp->port);      /*%< host byte order */
1087                 }
1088         if (sscanf(s, "%d", &n) != 1 || n <= 0)
1089                 n = -1;
1090         return (n);
1091 }
1092
1093 /*%
1094  * Convert service name or (ascii) number to int.
1095  */
1096 #ifdef _LIBC
1097 static
1098 #endif
1099 int
1100 res_servicenumber(const char *p) {
1101         if (servicelist == (struct valuelist *)0)
1102                 res_buildservicelist();
1103         return (findservice(p, &servicelist));
1104 }
1105
1106 /*%
1107  * Convert protocol name or (ascii) number to int.
1108  */
1109 #ifdef _LIBC
1110 static
1111 #endif
1112 int
1113 res_protocolnumber(const char *p) {
1114         if (protolist == (struct valuelist *)0)
1115                 res_buildprotolist();
1116         return (findservice(p, &protolist));
1117 }
1118
1119 #ifndef _LIBC
1120 static struct servent *
1121 cgetservbyport(u_int16_t port, const char *proto) {     /*%< Host byte order. */
1122         struct valuelist **list = &servicelist;
1123         struct valuelist *lp = *list;
1124         static struct servent serv;
1125
1126         port = ntohs(port);
1127         for (; lp != NULL; lp = lp->next) {
1128                 if (port != (u_int16_t)lp->port)        /*%< Host byte order. */
1129                         continue;
1130                 if (strcasecmp(lp->proto, proto) == 0) {
1131                         if (lp != *list) {
1132                                 lp->prev->next = lp->next;
1133                                 if (lp->next)
1134                                         lp->next->prev = lp->prev;
1135                                 (*list)->prev = lp;
1136                                 lp->next = *list;
1137                                 *list = lp;
1138                         }
1139                         serv.s_name = lp->name;
1140                         serv.s_port = htons((u_int16_t)lp->port);
1141                         serv.s_proto = lp->proto;
1142                         return (&serv);
1143                 }
1144         }
1145         return (0);
1146 }
1147
1148 static struct protoent *
1149 cgetprotobynumber(int proto) {                          /*%< Host byte order. */
1150         struct valuelist **list = &protolist;
1151         struct valuelist *lp = *list;
1152         static struct protoent prot;
1153
1154         for (; lp != NULL; lp = lp->next)
1155                 if (lp->port == proto) {                /*%< Host byte order. */
1156                         if (lp != *list) {
1157                                 lp->prev->next = lp->next;
1158                                 if (lp->next)
1159                                         lp->next->prev = lp->prev;
1160                                 (*list)->prev = lp;
1161                                 lp->next = *list;
1162                                 *list = lp;
1163                         }
1164                         prot.p_name = lp->name;
1165                         prot.p_proto = lp->port;        /*%< Host byte order. */
1166                         return (&prot);
1167                 }
1168         return (0);
1169 }
1170
1171 const char *
1172 res_protocolname(int num) {
1173         static char number[8];
1174         struct protoent *pp;
1175
1176         if (protolist == (struct valuelist *)0)
1177                 res_buildprotolist();
1178         pp = cgetprotobynumber(num);
1179         if (pp == NULL)  {
1180                 (void) sprintf(number, "%d", num);
1181                 return (number);
1182         }
1183         return (pp->p_name);
1184 }
1185
1186 const char *
1187 res_servicename(u_int16_t port, const char *proto) {    /*%< Host byte order. */
1188         static char number[8];
1189         struct servent *ss;
1190
1191         if (servicelist == (struct valuelist *)0)
1192                 res_buildservicelist();
1193         ss = cgetservbyport(htons(port), proto);
1194         if (ss == NULL)  {
1195                 (void) sprintf(number, "%d", port);
1196                 return (number);
1197         }
1198         return (ss->s_name);
1199 }
1200 #endif