lib/libc/resolv/res_mkupdate.c

   1 /*
   2  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (c) 1996-1999 by Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  15  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /*! \file
  19  * \brief
  20  * Based on the Dynamic DNS reference implementation by Viraj Bais
  21  * &lt;viraj_bais@ccm.fm.intel.com>
  22  */
  23
  24 #if !defined(lint) && !defined(SABER)
  25 static const char rcsid[] = "$Id: res_mkupdate.c,v 1.10 2008/12/11 09:59:00 marka Exp $";
  26 #endif /* not lint */
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  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 #ifdef _LIBC
  51 #include <isc/list.h>
  52 #endif
  53
  54 #include "port_after.h"
  55
  56 /* Options.  Leave them on. */
  57 #define DEBUG
  58 #define MAXPORT 1024
  59
  60 static int getnum_str(u_char **, u_char *);
  61 static int gethexnum_str(u_char **, u_char *);
  62 static int getword_str(char *, int, u_char **, u_char *);
  63 static int getstr_str(char *, int, u_char **, u_char *);
  64
  65 #define ShrinkBuffer(x)  if ((buflen -= x) < 0) return (-2);
  66
  67 /* Forward. */
  68
  69 #ifdef _LIBC
  70 static
  71 #endif
  72 int res_protocolnumber(const char *);
  73 #ifdef _LIBC
  74 static
  75 #endif
  76 int res_servicenumber(const char *);
  77
  78 /*%
  79  * Form update packets.
  80  * Returns the size of the resulting packet if no error
  81  *
  82  * On error,
  83  *      returns
  84  *\li              -1 if error in reading a word/number in rdata
  85  *                 portion for update packets
  86  *\li           -2 if length of buffer passed is insufficient
  87  *\li           -3 if zone section is not the first section in
  88  *                 the linked list, or section order has a problem
  89  *\li           -4 on a number overflow
  90  *\li           -5 unknown operation or no records
  91  */
  92 int
  93 res_nmkupdate(res_state statp, ns_updrec *rrecp_in, u_char *buf, int buflen) {
  94         ns_updrec *rrecp_start = rrecp_in;
  95         HEADER *hp;
  96         u_char *cp, *sp2, *startp, *endp;
  97         int n, i, soanum, multiline;
  98         ns_updrec *rrecp;
  99         struct in_addr ina;
 100         struct in6_addr in6a;
 101         char buf2[MAXDNAME];
 102         u_char buf3[MAXDNAME];
 103         int section, numrrs = 0, counts[ns_s_max];
 104         u_int16_t rtype, rclass;
 105         u_int32_t n1, rttl;
 106         u_char *dnptrs[20], **dpp, **lastdnptr;
 107 #ifndef _LIBC
 108         int siglen;
 109 #endif
 110         int keylen, certlen;
 111
 112         /*
 113          * Initialize header fields.
 114          */
 115         if ((buf == NULL) || (buflen < HFIXEDSZ))
 116                 return (-1);
 117         memset(buf, 0, HFIXEDSZ);
 118         hp = (HEADER *) buf;
 119         statp->id = res_nrandomid(statp);
 120         hp->id = htons(statp->id);
 121         hp->opcode = ns_o_update;
 122         hp->rcode = NOERROR;
 123         cp = buf + HFIXEDSZ;
 124         buflen -= HFIXEDSZ;
 125         dpp = dnptrs;
 126         *dpp++ = buf;
 127         *dpp++ = NULL;
 128         lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
 129
 130         if (rrecp_start == NULL)
 131                 return (-5);
 132         else if (rrecp_start->r_section != S_ZONE)
 133                 return (-3);
 134
 135         memset(counts, 0, sizeof counts);
 136         for (rrecp = rrecp_start; rrecp; rrecp = NEXT(rrecp, r_glink)) {
 137                 numrrs++;
 138                 section = rrecp->r_section;
 139                 if (section < 0 || section >= ns_s_max)
 140                         return (-1);
 141                 counts[section]++;
 142                 for (i = section + 1; i < ns_s_max; i++)
 143                         if (counts[i])
 144                                 return (-3);
 145                 rtype = rrecp->r_type;
 146                 rclass = rrecp->r_class;
 147                 rttl = rrecp->r_ttl;
 148                 /* overload class and type */
 149                 if (section == S_PREREQ) {
 150                         rttl = 0;
 151                         switch (rrecp->r_opcode) {
 152                         case YXDOMAIN:
 153                                 rclass = C_ANY;
 154                                 rtype = T_ANY;
 155                                 rrecp->r_size = 0;
 156                                 break;
 157                         case NXDOMAIN:
 158                                 rclass = C_NONE;
 159                                 rtype = T_ANY;
 160                                 rrecp->r_size = 0;
 161                                 break;
 162                         case NXRRSET:
 163                                 rclass = C_NONE;
 164                                 rrecp->r_size = 0;
 165                                 break;
 166                         case YXRRSET:
 167                                 if (rrecp->r_size == 0)
 168                                         rclass = C_ANY;
 169                                 break;
 170                         default:
 171                                 fprintf(stderr,
 172                                         "res_mkupdate: incorrect opcode: %d\n",
 173                                         rrecp->r_opcode);
 174                                 fflush(stderr);
 175                                 return (-1);
 176                         }
 177                 } else if (section == S_UPDATE) {
 178                         switch (rrecp->r_opcode) {
 179                         case DELETE:
 180                                 rclass = rrecp->r_size == 0 ? C_ANY : C_NONE;
 181                                 break;
 182                         case ADD:
 183                                 break;
 184                         default:
 185                                 fprintf(stderr,
 186                                         "res_mkupdate: incorrect opcode: %d\n",
 187                                         rrecp->r_opcode);
 188                                 fflush(stderr);
 189                                 return (-1);
 190                         }
 191                 }
 192
 193                 /*
 194                  * XXX  appending default domain to owner name is omitted,
 195                  *      fqdn must be provided
 196                  */
 197                 if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs,
 198                                  lastdnptr)) < 0)
 199                         return (-1);
 200                 cp += n;
 201                 ShrinkBuffer(n + 2*INT16SZ);
 202                 PUTSHORT(rtype, cp);
 203                 PUTSHORT(rclass, cp);
 204                 if (section == S_ZONE) {
 205                         if (numrrs != 1 || rrecp->r_type != T_SOA)
 206                                 return (-3);
 207                         continue;
 208                 }
 209                 ShrinkBuffer(INT32SZ + INT16SZ);
 210                 PUTLONG(rttl, cp);
 211                 sp2 = cp;  /*%< save pointer to length byte */
 212                 cp += INT16SZ;
 213                 if (rrecp->r_size == 0) {
 214                         if (section == S_UPDATE && rclass != C_ANY)
 215                                 return (-1);
 216                         else {
 217                                 PUTSHORT(0, sp2);
 218                                 continue;
 219                         }
 220                 }
 221                 startp = rrecp->r_data;
 222                 endp = startp + rrecp->r_size - 1;
 223                 /* XXX this should be done centrally. */
 224                 switch (rrecp->r_type) {
 225                 case T_A:
 226                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 227                                 return (-1);
 228                         if (!inet_aton(buf2, &ina))
 229                                 return (-1);
 230                         n1 = ntohl(ina.s_addr);
 231                         ShrinkBuffer(INT32SZ);
 232                         PUTLONG(n1, cp);
 233                         break;
 234                 case T_CNAME:
 235                 case T_MB:
 236                 case T_MG:
 237                 case T_MR:
 238                 case T_NS:
 239                 case T_PTR:
 240                 case ns_t_dname:
 241                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 242                                 return (-1);
 243                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 244                         if (n < 0)
 245                                 return (-1);
 246                         cp += n;
 247                         ShrinkBuffer(n);
 248                         break;
 249                 case T_MINFO:
 250                 case T_SOA:
 251                 case T_RP:
 252                         for (i = 0; i < 2; i++) {
 253                                 if (!getword_str(buf2, sizeof buf2, &startp,
 254                                                  endp))
 255                                 return (-1);
 256                                 n = dn_comp(buf2, cp, buflen,
 257                                             dnptrs, lastdnptr);
 258                                 if (n < 0)
 259                                         return (-1);
 260                                 cp += n;
 261                                 ShrinkBuffer(n);
 262                         }
 263                         if (rrecp->r_type == T_SOA) {
 264                                 ShrinkBuffer(5 * INT32SZ);
 265                                 while (isspace(*startp) || !*startp)
 266                                         startp++;
 267                                 if (*startp == '(') {
 268                                         multiline = 1;
 269                                         startp++;
 270                                 } else
 271                                         multiline = 0;
 272                                 /* serial, refresh, retry, expire, minimum */
 273                                 for (i = 0; i < 5; i++) {
 274                                         soanum = getnum_str(&startp, endp);
 275                                         if (soanum < 0)
 276                                                 return (-1);
 277                                         PUTLONG(soanum, cp);
 278                                 }
 279                                 if (multiline) {
 280                                         while (isspace(*startp) || !*startp)
 281                                                 startp++;
 282                                         if (*startp != ')')
 283                                                 return (-1);
 284                                 }
 285                         }
 286                         break;
 287                 case T_MX:
 288                 case T_AFSDB:
 289                 case T_RT:
 290                         n = getnum_str(&startp, endp);
 291                         if (n < 0)
 292                                 return (-1);
 293                         ShrinkBuffer(INT16SZ);
 294                         PUTSHORT(n, cp);
 295                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 296                                 return (-1);
 297                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 298                         if (n < 0)
 299                                 return (-1);
 300                         cp += n;
 301                         ShrinkBuffer(n);
 302                         break;
 303                 case T_SRV:
 304                         n = getnum_str(&startp, endp);
 305                         if (n < 0)
 306                                 return (-1);
 307                         ShrinkBuffer(INT16SZ);
 308                         PUTSHORT(n, cp);
 309
 310                         n = getnum_str(&startp, endp);
 311                         if (n < 0)
 312                                 return (-1);
 313                         ShrinkBuffer(INT16SZ);
 314                         PUTSHORT(n, cp);
 315
 316                         n = getnum_str(&startp, endp);
 317                         if (n < 0)
 318                                 return (-1);
 319                         ShrinkBuffer(INT16SZ);
 320                         PUTSHORT(n, cp);
 321
 322                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 323                                 return (-1);
 324                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 325                         if (n < 0)
 326                                 return (-1);
 327                         cp += n;
 328                         ShrinkBuffer(n);
 329                         break;
 330                 case T_PX:
 331                         n = getnum_str(&startp, endp);
 332                         if (n < 0)
 333                                 return (-1);
 334                         PUTSHORT(n, cp);
 335                         ShrinkBuffer(INT16SZ);
 336                         for (i = 0; i < 2; i++) {
 337                                 if (!getword_str(buf2, sizeof buf2, &startp,
 338                                                  endp))
 339                                         return (-1);
 340                                 n = dn_comp(buf2, cp, buflen, dnptrs,
 341                                             lastdnptr);
 342                                 if (n < 0)
 343                                         return (-1);
 344                                 cp += n;
 345                                 ShrinkBuffer(n);
 346                         }
 347                         break;
 348                 case T_WKS: {
 349                         char bm[MAXPORT/8];
 350                         unsigned int maxbm = 0;
 351
 352                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 353                                 return (-1);
 354                         if (!inet_aton(buf2, &ina))
 355                                 return (-1);
 356                         n1 = ntohl(ina.s_addr);
 357                         ShrinkBuffer(INT32SZ);
 358                         PUTLONG(n1, cp);
 359
 360                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 361                                 return (-1);
 362                         if ((i = res_protocolnumber(buf2)) < 0)
 363                                 return (-1);
 364                         ShrinkBuffer(1);
 365                         *cp++ = i & 0xff;
 366
 367                         for (i = 0; i < MAXPORT/8 ; i++)
 368                                 bm[i] = 0;
 369
 370                         while (getword_str(buf2, sizeof buf2, &startp, endp)) {
 371                                 if ((n = res_servicenumber(buf2)) <= 0)
 372                                         return (-1);
 373
 374                                 if (n < MAXPORT) {
 375                                         bm[n/8] |= (0x80>>(n%8));
 376                                         if ((unsigned)n > maxbm)
 377                                                 maxbm = n;
 378                                 } else
 379                                         return (-1);
 380                         }
 381                         maxbm = maxbm/8 + 1;
 382                         ShrinkBuffer(maxbm);
 383                         memcpy(cp, bm, maxbm);
 384                         cp += maxbm;
 385                         break;
 386                 }
 387                 case T_HINFO:
 388                         for (i = 0; i < 2; i++) {
 389                                 if ((n = getstr_str(buf2, sizeof buf2,
 390                                                 &startp, endp)) < 0)
 391                                         return (-1);
 392                                 if (n > 255)
 393                                         return (-1);
 394                                 ShrinkBuffer(n+1);
 395                                 *cp++ = n;
 396                                 memcpy(cp, buf2, n);
 397                                 cp += n;
 398                         }
 399                         break;
 400                 case T_TXT:
 401                         for (;;) {
 402                                 if ((n = getstr_str(buf2, sizeof buf2,
 403                                                 &startp, endp)) < 0) {
 404                                         if (cp != (sp2 + INT16SZ))
 405                                                 break;
 406                                         return (-1);
 407                                 }
 408                                 if (n > 255)
 409                                         return (-1);
 410                                 ShrinkBuffer(n+1);
 411                                 *cp++ = n;
 412                                 memcpy(cp, buf2, n);
 413                                 cp += n;
 414                         }
 415                         break;
 416                 case T_X25:
 417                         /* RFC1183 */
 418                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 419                                          endp)) < 0)
 420                                 return (-1);
 421                         if (n > 255)
 422                                 return (-1);
 423                         ShrinkBuffer(n+1);
 424                         *cp++ = n;
 425                         memcpy(cp, buf2, n);
 426                         cp += n;
 427                         break;
 428                 case T_ISDN:
 429                         /* RFC1183 */
 430                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 431                                          endp)) < 0)
 432                                 return (-1);
 433                         if ((n > 255) || (n == 0))
 434                                 return (-1);
 435                         ShrinkBuffer(n+1);
 436                         *cp++ = n;
 437                         memcpy(cp, buf2, n);
 438                         cp += n;
 439                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 440                                          endp)) < 0)
 441                                 n = 0;
 442                         if (n > 255)
 443                                 return (-1);
 444                         ShrinkBuffer(n+1);
 445                         *cp++ = n;
 446                         memcpy(cp, buf2, n);
 447                         cp += n;
 448                         break;
 449                 case T_NSAP:
 450                         if ((n = inet_nsap_addr((char *)startp, (u_char *)buf2, sizeof(buf2))) != 0) {
 451                                 ShrinkBuffer(n);
 452                                 memcpy(cp, buf2, n);
 453                                 cp += n;
 454                         } else {
 455                                 return (-1);
 456                         }
 457                         break;
 458                 case T_LOC:
 459                         if ((n = loc_aton((char *)startp, (u_char *)buf2)) != 0) {
 460                                 ShrinkBuffer(n);
 461                                 memcpy(cp, buf2, n);
 462                                 cp += n;
 463                         } else
 464                                 return (-1);
 465                         break;
 466                 case ns_t_sig:
 467 #ifdef _LIBC
 468                         return (-1);
 469 #else
 470                     {
 471                         int sig_type, success, dateerror;
 472                         u_int32_t exptime, timesigned;
 473
 474                         /* type */
 475                         if ((n = getword_str(buf2, sizeof buf2,
 476                                              &startp, endp)) < 0)
 477                                 return (-1);
 478                         sig_type = sym_ston(__p_type_syms, buf2, &success);
 479                         if (!success || sig_type == ns_t_any)
 480                                 return (-1);
 481                         ShrinkBuffer(INT16SZ);
 482                         PUTSHORT(sig_type, cp);
 483                         /* alg */
 484                         n = getnum_str(&startp, endp);
 485                         if (n < 0)
 486                                 return (-1);
 487                         ShrinkBuffer(1);
 488                         *cp++ = n;
 489                         /* labels */
 490                         n = getnum_str(&startp, endp);
 491                         if (n <= 0 || n > 255)
 492                                 return (-1);
 493                         ShrinkBuffer(1);
 494                         *cp++ = n;
 495                         /* ottl  & expire */
 496                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 497                                 return (-1);
 498                         exptime = ns_datetosecs(buf2, &dateerror);
 499                         if (!dateerror) {
 500                                 ShrinkBuffer(INT32SZ);
 501                                 PUTLONG(rttl, cp);
 502                         }
 503                         else {
 504                                 char *ulendp;
 505                                 u_int32_t ottl;
 506
 507                                 errno = 0;
 508                                 ottl = strtoul(buf2, &ulendp, 10);
 509                                 if (errno != 0 ||
 510                                     (ulendp != NULL && *ulendp != '\0'))
 511                                         return (-1);
 512                                 ShrinkBuffer(INT32SZ);
 513                                 PUTLONG(ottl, cp);
 514                                 if (!getword_str(buf2, sizeof buf2, &startp,
 515                                                  endp))
 516                                         return (-1);
 517                                 exptime = ns_datetosecs(buf2, &dateerror);
 518                                 if (dateerror)
 519                                         return (-1);
 520                         }
 521                         /* expire */
 522                         ShrinkBuffer(INT32SZ);
 523                         PUTLONG(exptime, cp);
 524                         /* timesigned */
 525                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 526                                 return (-1);
 527                         timesigned = ns_datetosecs(buf2, &dateerror);
 528                         if (!dateerror) {
 529                                 ShrinkBuffer(INT32SZ);
 530                                 PUTLONG(timesigned, cp);
 531                         }
 532                         else
 533                                 return (-1);
 534                         /* footprint */
 535                         n = getnum_str(&startp, endp);
 536                         if (n < 0)
 537                                 return (-1);
 538                         ShrinkBuffer(INT16SZ);
 539                         PUTSHORT(n, cp);
 540                         /* signer name */
 541                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 542                                 return (-1);
 543                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 544                         if (n < 0)
 545                                 return (-1);
 546                         cp += n;
 547                         ShrinkBuffer(n);
 548                         /* sig */
 549                         if ((n = getword_str(buf2, sizeof buf2,
 550                                              &startp, endp)) < 0)
 551                                 return (-1);
 552                         siglen = b64_pton(buf2, buf3, sizeof(buf3));
 553                         if (siglen < 0)
 554                                 return (-1);
 555                         ShrinkBuffer(siglen);
 556                         memcpy(cp, buf3, siglen);
 557                         cp += siglen;
 558                         break;
 559                     }
 560 #endif
 561                 case ns_t_key:
 562                         /* flags */
 563                         n = gethexnum_str(&startp, endp);
 564                         if (n < 0)
 565                                 return (-1);
 566                         ShrinkBuffer(INT16SZ);
 567                         PUTSHORT(n, cp);
 568                         /* proto */
 569                         n = getnum_str(&startp, endp);
 570                         if (n < 0)
 571                                 return (-1);
 572                         ShrinkBuffer(1);
 573                         *cp++ = n;
 574                         /* alg */
 575                         n = getnum_str(&startp, endp);
 576                         if (n < 0)
 577                                 return (-1);
 578                         ShrinkBuffer(1);
 579                         *cp++ = n;
 580                         /* key */
 581                         if ((n = getword_str(buf2, sizeof buf2,
 582                                              &startp, endp)) < 0)
 583                                 return (-1);
 584                         keylen = b64_pton(buf2, buf3, sizeof(buf3));
 585                         if (keylen < 0)
 586                                 return (-1);
 587                         ShrinkBuffer(keylen);
 588                         memcpy(cp, buf3, keylen);
 589                         cp += keylen;
 590                         break;
 591                 case ns_t_nxt:
 592                     {
 593                         int success, nxt_type;
 594                         u_char data[32];
 595                         int maxtype;
 596
 597                         /* next name */
 598                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 599                                 return (-1);
 600                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 601                         if (n < 0)
 602                                 return (-1);
 603                         cp += n;
 604                         ShrinkBuffer(n);
 605                         maxtype = 0;
 606                         memset(data, 0, sizeof data);
 607                         for (;;) {
 608                                 if (!getword_str(buf2, sizeof buf2, &startp,
 609                                                  endp))
 610                                         break;
 611                                 nxt_type = sym_ston(__p_type_syms, buf2,
 612                                                     &success);
 613                                 if (!success || !ns_t_rr_p(nxt_type))
 614                                         return (-1);
 615                                 NS_NXT_BIT_SET(nxt_type, data);
 616                                 if (nxt_type > maxtype)
 617                                         maxtype = nxt_type;
 618                         }
 619                         n = maxtype/NS_NXT_BITS+1;
 620                         ShrinkBuffer(n);
 621                         memcpy(cp, data, n);
 622                         cp += n;
 623                         break;
 624                     }
 625                 case ns_t_cert:
 626                         /* type */
 627                         n = getnum_str(&startp, endp);
 628                         if (n < 0)
 629                                 return (-1);
 630                         ShrinkBuffer(INT16SZ);
 631                         PUTSHORT(n, cp);
 632                         /* key tag */
 633                         n = getnum_str(&startp, endp);
 634                         if (n < 0)
 635                                 return (-1);
 636                         ShrinkBuffer(INT16SZ);
 637                         PUTSHORT(n, cp);
 638                         /* alg */
 639                         n = getnum_str(&startp, endp);
 640                         if (n < 0)
 641                                 return (-1);
 642                         ShrinkBuffer(1);
 643                         *cp++ = n;
 644                         /* cert */
 645                         if ((n = getword_str(buf2, sizeof buf2,
 646                                              &startp, endp)) < 0)
 647                                 return (-1);
 648                         certlen = b64_pton(buf2, buf3, sizeof(buf3));
 649                         if (certlen < 0)
 650                                 return (-1);
 651                         ShrinkBuffer(certlen);
 652                         memcpy(cp, buf3, certlen);
 653                         cp += certlen;
 654                         break;
 655                 case ns_t_aaaa:
 656                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 657                                 return (-1);
 658                         if (inet_pton(AF_INET6, buf2, &in6a) <= 0)
 659                                 return (-1);
 660                         ShrinkBuffer(NS_IN6ADDRSZ);
 661                         memcpy(cp, &in6a, NS_IN6ADDRSZ);
 662                         cp += NS_IN6ADDRSZ;
 663                         break;
 664                 case ns_t_naptr:
 665                         /* Order Preference Flags Service Replacement Regexp */
 666                         /* Order */
 667                         n = getnum_str(&startp, endp);
 668                         if (n < 0 || n > 65535)
 669                                 return (-1);
 670                         ShrinkBuffer(INT16SZ);
 671                         PUTSHORT(n, cp);
 672                         /* Preference */
 673                         n = getnum_str(&startp, endp);
 674                         if (n < 0 || n > 65535)
 675                                 return (-1);
 676                         ShrinkBuffer(INT16SZ);
 677                         PUTSHORT(n, cp);
 678                         /* Flags */
 679                         if ((n = getstr_str(buf2, sizeof buf2,
 680                                         &startp, endp)) < 0) {
 681                                 return (-1);
 682                         }
 683                         if (n > 255)
 684                                 return (-1);
 685                         ShrinkBuffer(n+1);
 686                         *cp++ = n;
 687                         memcpy(cp, buf2, n);
 688                         cp += n;
 689                         /* Service Classes */
 690                         if ((n = getstr_str(buf2, sizeof buf2,
 691                                         &startp, endp)) < 0) {
 692                                 return (-1);
 693                         }
 694                         if (n > 255)
 695                                 return (-1);
 696                         ShrinkBuffer(n+1);
 697                         *cp++ = n;
 698                         memcpy(cp, buf2, n);
 699                         cp += n;
 700                         /* Pattern */
 701                         if ((n = getstr_str(buf2, sizeof buf2,
 702                                         &startp, endp)) < 0) {
 703                                 return (-1);
 704                         }
 705                         if (n > 255)
 706                                 return (-1);
 707                         ShrinkBuffer(n+1);
 708                         *cp++ = n;
 709                         memcpy(cp, buf2, n);
 710                         cp += n;
 711                         /* Replacement */
 712                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 713                                 return (-1);
 714                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 715                         if (n < 0)
 716                                 return (-1);
 717                         cp += n;
 718                         ShrinkBuffer(n);
 719                         break;
 720                 default:
 721                         return (-1);
 722                 } /*switch*/
 723                 n = (u_int16_t)((cp - sp2) - INT16SZ);
 724                 PUTSHORT(n, sp2);
 725         } /*for*/
 726
 727         hp->qdcount = htons(counts[0]);
 728         hp->ancount = htons(counts[1]);
 729         hp->nscount = htons(counts[2]);
 730         hp->arcount = htons(counts[3]);
 731         return (cp - buf);
 732 }
 733
 734 /*%
 735  * Get a whitespace delimited word from a string (not file)
 736  * into buf. modify the start pointer to point after the
 737  * word in the string.
 738  */
 739 static int
 740 getword_str(char *buf, int size, u_char **startpp, u_char *endp) {
 741         char *cp;
 742         int c;
 743
 744         for (cp = buf; *startpp <= endp; ) {
 745                 c = **startpp;
 746                 if (isspace(c) || c == '\0') {
 747                         if (cp != buf) /*%< trailing whitespace */
 748                                 break;
 749                         else { /*%< leading whitespace */
 750                                 (*startpp)++;
 751                                 continue;
 752                         }
 753                 }
 754                 (*startpp)++;
 755                 if (cp >= buf+size-1)
 756                         break;
 757                 *cp++ = (u_char)c;
 758         }
 759         *cp = '\0';
 760         return (cp != buf);
 761 }
 762
 763 /*%
 764  * get a white spae delimited string from memory.  Process quoted strings
 765  * and \\DDD escapes.  Return length or -1 on error.  Returned string may
 766  * contain nulls.
 767  */
 768 static char digits[] = "0123456789";
 769 static int
 770 getstr_str(char *buf, int size, u_char **startpp, u_char *endp) {
 771         char *cp;
 772         int c, c1 = 0;
 773         int inquote = 0;
 774         int seen_quote = 0;
 775         int escape = 0;
 776         int dig = 0;
 777
 778         for (cp = buf; *startpp <= endp; ) {
 779                 if ((c = **startpp) == '\0')
 780                         break;
 781                 /* leading white space */
 782                 if ((cp == buf) && !seen_quote && isspace(c)) {
 783                         (*startpp)++;
 784                         continue;
 785                 }
 786
 787                 switch (c) {
 788                 case '\\':
 789                         if (!escape)  {
 790                                 escape = 1;
 791                                 dig = 0;
 792                                 c1 = 0;
 793                                 (*startpp)++;
 794                                 continue;
 795                         }
 796                         goto do_escape;
 797                 case '"':
 798                         if (!escape) {
 799                                 inquote = !inquote;
 800                                 seen_quote = 1;
 801                                 (*startpp)++;
 802                                 continue;
 803                         }
 804                         /* fall through */
 805                 default:
 806                 do_escape:
 807                         if (escape) {
 808                                 switch (c) {
 809                                 case '0':
 810                                 case '1':
 811                                 case '2':
 812                                 case '3':
 813                                 case '4':
 814                                 case '5':
 815                                 case '6':
 816                                 case '7':
 817                                 case '8':
 818                                 case '9':
 819                                         c1 = c1 * 10 +
 820                                                 (strchr(digits, c) - digits);
 821
 822                                         if (++dig == 3) {
 823                                                 c = c1 &0xff;
 824                                                 break;
 825                                         }
 826                                         (*startpp)++;
 827                                         continue;
 828                                 }
 829                                 escape = 0;
 830                         } else if (!inquote && isspace(c))
 831                                 goto done;
 832                         if (cp >= buf+size-1)
 833                                 goto done;
 834                         *cp++ = (u_char)c;
 835                         (*startpp)++;
 836                 }
 837         }
 838  done:
 839         *cp = '\0';
 840         return ((cp == buf)?  (seen_quote? 0: -1): (cp - buf));
 841 }
 842
 843 /*%
 844  * Get a whitespace delimited base 16 number from a string (not file) into buf
 845  * update the start pointer to point after the number in the string.
 846  */
 847 static int
 848 gethexnum_str(u_char **startpp, u_char *endp) {
 849         int c, n;
 850         int seendigit = 0;
 851         int m = 0;
 852
 853         if (*startpp + 2 >= endp || strncasecmp((char *)*startpp, "0x", 2) != 0)
 854                 return getnum_str(startpp, endp);
 855         (*startpp)+=2;
 856         for (n = 0; *startpp <= endp; ) {
 857                 c = **startpp;
 858                 if (isspace(c) || c == '\0') {
 859                         if (seendigit) /*%< trailing whitespace */
 860                                 break;
 861                         else { /*%< leading whitespace */
 862                                 (*startpp)++;
 863                                 continue;
 864                         }
 865                 }
 866                 if (c == ';') {
 867                         while ((*startpp <= endp) &&
 868                                ((c = **startpp) != '\n'))
 869                                         (*startpp)++;
 870                         if (seendigit)
 871                                 break;
 872                         continue;
 873                 }
 874                 if (!isxdigit(c)) {
 875                         if (c == ')' && seendigit) {
 876                                 (*startpp)--;
 877                                 break;
 878                         }
 879                         return (-1);
 880                 }
 881                 (*startpp)++;
 882                 if (isdigit(c))
 883                         n = n * 16 + (c - '0');
 884                 else
 885                         n = n * 16 + (tolower(c) - 'a' + 10);
 886                 seendigit = 1;
 887         }
 888         return (n + m);
 889 }
 890
 891 /*%
 892  * Get a whitespace delimited base 10 number from a string (not file) into buf
 893  * update the start pointer to point after the number in the string.
 894  */
 895 static int
 896 getnum_str(u_char **startpp, u_char *endp) {
 897         int c, n;
 898         int seendigit = 0;
 899         int m = 0;
 900
 901         for (n = 0; *startpp <= endp; ) {
 902                 c = **startpp;
 903                 if (isspace(c) || c == '\0') {
 904                         if (seendigit) /*%< trailing whitespace */
 905                                 break;
 906                         else { /*%< leading whitespace */
 907                                 (*startpp)++;
 908                                 continue;
 909                         }
 910                 }
 911                 if (c == ';') {
 912                         while ((*startpp <= endp) &&
 913                                ((c = **startpp) != '\n'))
 914                                         (*startpp)++;
 915                         if (seendigit)
 916                                 break;
 917                         continue;
 918                 }
 919                 if (!isdigit(c)) {
 920                         if (c == ')' && seendigit) {
 921                                 (*startpp)--;
 922                                 break;
 923                         }
 924                         return (-1);
 925                 }
 926                 (*startpp)++;
 927                 n = n * 10 + (c - '0');
 928                 seendigit = 1;
 929         }
 930         return (n + m);
 931 }
 932
 933 /*%
 934  * Allocate a resource record buffer & save rr info.
 935  */
 936 ns_updrec *
 937 res_mkupdrec(int section, const char *dname,
 938              u_int class, u_int type, u_long ttl) {
 939         ns_updrec *rrecp = (ns_updrec *)calloc(1, sizeof(ns_updrec));
 940
 941         if (!rrecp || !(rrecp->r_dname = strdup(dname))) {
 942                 if (rrecp)
 943                         free((char *)rrecp);
 944                 return (NULL);
 945         }
 946         INIT_LINK(rrecp, r_link);
 947         INIT_LINK(rrecp, r_glink);
 948         rrecp->r_class = (ns_class)class;
 949         rrecp->r_type = (ns_type)type;
 950         rrecp->r_ttl = ttl;
 951         rrecp->r_section = (ns_sect)section;
 952         return (rrecp);
 953 }
 954
 955 /*%
 956  * Free a resource record buffer created by res_mkupdrec.
 957  */
 958 void
 959 res_freeupdrec(ns_updrec *rrecp) {
 960         /* Note: freeing r_dp is the caller's responsibility. */
 961         if (rrecp->r_dname != NULL)
 962                 free(rrecp->r_dname);
 963         free(rrecp);
 964 }
 965
 966 struct valuelist {
 967         struct valuelist *      next;
 968         struct valuelist *      prev;
 969         char *                  name;
 970         char *                  proto;
 971         int                     port;
 972 };
 973 static struct valuelist *servicelist, *protolist;
 974
 975 static void
 976 res_buildservicelist() {
 977         struct servent *sp;
 978         struct valuelist *slp;
 979
 980 #ifdef MAYBE_HESIOD
 981         setservent(0);
 982 #else
 983         setservent(1);
 984 #endif
 985         while ((sp = getservent()) != NULL) {
 986                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
 987                 if (!slp)
 988                         break;
 989                 slp->name = strdup(sp->s_name);
 990                 slp->proto = strdup(sp->s_proto);
 991                 if ((slp->name == NULL) || (slp->proto == NULL)) {
 992                         if (slp->name) free(slp->name);
 993                         if (slp->proto) free(slp->proto);
 994                         free(slp);
 995                         break;
 996                 }
 997                 slp->port = ntohs((u_int16_t)sp->s_port);  /*%< host byt order */
 998                 slp->next = servicelist;
 999                 slp->prev = NULL;
1000                 if (servicelist)
1001                         servicelist->prev = slp;
1002                 servicelist = slp;
1003         }
1004         endservent();
1005 }
1006
1007 #ifndef _LIBC
1008 void
1009 res_destroyservicelist() {
1010         struct valuelist *slp, *slp_next;
1011
1012         for (slp = servicelist; slp != NULL; slp = slp_next) {
1013                 slp_next = slp->next;
1014                 free(slp->name);
1015                 free(slp->proto);
1016                 free(slp);
1017         }
1018         servicelist = (struct valuelist *)0;
1019 }
1020 #endif
1021
1022 #ifdef _LIBC
1023 static
1024 #endif
1025 void
1026 res_buildprotolist(void) {
1027         struct protoent *pp;
1028         struct valuelist *slp;
1029
1030 #ifdef MAYBE_HESIOD
1031         setprotoent(0);
1032 #else
1033         setprotoent(1);
1034 #endif
1035         while ((pp = getprotoent()) != NULL) {
1036                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
1037                 if (!slp)
1038                         break;
1039                 slp->name = strdup(pp->p_name);
1040                 if (slp->name == NULL) {
1041                         free(slp);
1042                         break;
1043                 }
1044                 slp->port = pp->p_proto;        /*%< host byte order */
1045                 slp->next = protolist;
1046                 slp->prev = NULL;
1047                 if (protolist)
1048                         protolist->prev = slp;
1049                 protolist = slp;
1050         }
1051         endprotoent();
1052 }
1053
1054 #ifndef _LIBC
1055 void
1056 res_destroyprotolist(void) {
1057         struct valuelist *plp, *plp_next;
1058
1059         for (plp = protolist; plp != NULL; plp = plp_next) {
1060                 plp_next = plp->next;
1061                 free(plp->name);
1062                 free(plp);
1063         }
1064         protolist = (struct valuelist *)0;
1065 }
1066 #endif
1067
1068 static int
1069 findservice(const char *s, struct valuelist **list) {
1070         struct valuelist *lp = *list;
1071         int n;
1072
1073         for (; lp != NULL; lp = lp->next)
1074                 if (strcasecmp(lp->name, s) == 0) {
1075                         if (lp != *list) {
1076                                 lp->prev->next = lp->next;
1077                                 if (lp->next)
1078                                         lp->next->prev = lp->prev;
1079                                 (*list)->prev = lp;
1080                                 lp->next = *list;
1081                                 *list = lp;
1082                         }
1083                         return (lp->port);      /*%< host byte order */
1084                 }
1085         if (sscanf(s, "%d", &n) != 1 || n <= 0)
1086                 n = -1;
1087         return (n);
1088 }
1089
1090 /*%
1091  * Convert service name or (ascii) number to int.
1092  */
1093 #ifdef _LIBC
1094 static
1095 #endif
1096 int
1097 res_servicenumber(const char *p) {
1098         if (servicelist == (struct valuelist *)0)
1099                 res_buildservicelist();
1100         return (findservice(p, &servicelist));
1101 }
1102
1103 /*%
1104  * Convert protocol name or (ascii) number to int.
1105  */
1106 #ifdef _LIBC
1107 static
1108 #endif
1109 int
1110 res_protocolnumber(const char *p) {
1111         if (protolist == (struct valuelist *)0)
1112                 res_buildprotolist();
1113         return (findservice(p, &protolist));
1114 }
1115
1116 #ifndef _LIBC
1117 static struct servent *
1118 cgetservbyport(u_int16_t port, const char *proto) {     /*%< Host byte order. */
1119         struct valuelist **list = &servicelist;
1120         struct valuelist *lp = *list;
1121         static struct servent serv;
1122
1123         port = ntohs(port);
1124         for (; lp != NULL; lp = lp->next) {
1125                 if (port != (u_int16_t)lp->port)        /*%< Host byte order. */
1126                         continue;
1127                 if (strcasecmp(lp->proto, proto) == 0) {
1128                         if (lp != *list) {
1129                                 lp->prev->next = lp->next;
1130                                 if (lp->next)
1131                                         lp->next->prev = lp->prev;
1132                                 (*list)->prev = lp;
1133                                 lp->next = *list;
1134                                 *list = lp;
1135                         }
1136                         serv.s_name = lp->name;
1137                         serv.s_port = htons((u_int16_t)lp->port);
1138                         serv.s_proto = lp->proto;
1139                         return (&serv);
1140                 }
1141         }
1142         return (0);
1143 }
1144
1145 static struct protoent *
1146 cgetprotobynumber(int proto) {                          /*%< Host byte order. */
1147         struct valuelist **list = &protolist;
1148         struct valuelist *lp = *list;
1149         static struct protoent prot;
1150
1151         for (; lp != NULL; lp = lp->next)
1152                 if (lp->port == proto) {                /*%< Host byte order. */
1153                         if (lp != *list) {
1154                                 lp->prev->next = lp->next;
1155                                 if (lp->next)
1156                                         lp->next->prev = lp->prev;
1157                                 (*list)->prev = lp;
1158                                 lp->next = *list;
1159                                 *list = lp;
1160                         }
1161                         prot.p_name = lp->name;
1162                         prot.p_proto = lp->port;        /*%< Host byte order. */
1163                         return (&prot);
1164                 }
1165         return (0);
1166 }
1167
1168 const char *
1169 res_protocolname(int num) {
1170         static char number[8];
1171         struct protoent *pp;
1172
1173         if (protolist == (struct valuelist *)0)
1174                 res_buildprotolist();
1175         pp = cgetprotobynumber(num);
1176         if (pp == 0)  {
1177                 (void) sprintf(number, "%d", num);
1178                 return (number);
1179         }
1180         return (pp->p_name);
1181 }
1182
1183 const char *
1184 res_servicename(u_int16_t port, const char *proto) {    /*%< Host byte order. */
1185         static char number[8];
1186         struct servent *ss;
1187
1188         if (servicelist == (struct valuelist *)0)
1189                 res_buildservicelist();
1190         ss = cgetservbyport(htons(port), proto);
1191         if (ss == 0)  {
1192                 (void) sprintf(number, "%d", port);
1193                 return (number);
1194         }
1195         return (ss->s_name);
1196 }
1197 #endif