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 #ifndef DEBUG
  58 #define DEBUG
  59 #endif
  60 #define MAXPORT 1024
  61
  62 static int getnum_str(u_char **, u_char *);
  63 static int gethexnum_str(u_char **, u_char *);
  64 static int getword_str(char *, int, u_char **, u_char *);
  65 static int getstr_str(char *, int, u_char **, u_char *);
  66
  67 #define ShrinkBuffer(x)  if ((buflen -= x) < 0) return (-2);
  68
  69 /* Forward. */
  70
  71 #ifdef _LIBC
  72 static
  73 #endif
  74 int res_protocolnumber(const char *);
  75 #ifdef _LIBC
  76 static
  77 #endif
  78 int res_servicenumber(const char *);
  79
  80 /*%
  81  * Form update packets.
  82  * Returns the size of the resulting packet if no error
  83  *
  84  * On error,
  85  *      returns
  86  *\li              -1 if error in reading a word/number in rdata
  87  *                 portion for update packets
  88  *\li           -2 if length of buffer passed is insufficient
  89  *\li           -3 if zone section is not the first section in
  90  *                 the linked list, or section order has a problem
  91  *\li           -4 on a number overflow
  92  *\li           -5 unknown operation or no records
  93  */
  94 int
  95 res_nmkupdate(res_state statp, ns_updrec *rrecp_in, u_char *buf, int buflen) {
  96         ns_updrec *rrecp_start = rrecp_in;
  97         HEADER *hp;
  98         u_char *cp, *sp2, *startp, *endp;
  99         int n, i, soanum, multiline;
 100         ns_updrec *rrecp;
 101         struct in_addr ina;
 102         struct in6_addr in6a;
 103         char buf2[MAXDNAME];
 104         u_char buf3[MAXDNAME];
 105         int section, numrrs = 0, counts[ns_s_max];
 106         u_int16_t rtype, rclass;
 107         u_int32_t n1, rttl;
 108         u_char *dnptrs[20], **dpp, **lastdnptr;
 109 #ifndef _LIBC
 110         int siglen;
 111 #endif
 112         int keylen, certlen;
 113
 114         /*
 115          * Initialize header fields.
 116          */
 117         if ((buf == NULL) || (buflen < HFIXEDSZ))
 118                 return (-1);
 119         memset(buf, 0, HFIXEDSZ);
 120         hp = (HEADER *) buf;
 121         statp->id = res_nrandomid(statp);
 122         hp->id = htons(statp->id);
 123         hp->opcode = ns_o_update;
 124         hp->rcode = NOERROR;
 125         cp = buf + HFIXEDSZ;
 126         buflen -= HFIXEDSZ;
 127         dpp = dnptrs;
 128         *dpp++ = buf;
 129         *dpp++ = NULL;
 130         lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
 131
 132         if (rrecp_start == NULL)
 133                 return (-5);
 134         else if (rrecp_start->r_section != S_ZONE)
 135                 return (-3);
 136
 137         memset(counts, 0, sizeof counts);
 138         for (rrecp = rrecp_start; rrecp; rrecp = NEXT(rrecp, r_glink)) {
 139                 numrrs++;
 140                 section = rrecp->r_section;
 141                 if (section < 0 || section >= ns_s_max)
 142                         return (-1);
 143                 counts[section]++;
 144                 for (i = section + 1; i < ns_s_max; i++)
 145                         if (counts[i])
 146                                 return (-3);
 147                 rtype = rrecp->r_type;
 148                 rclass = rrecp->r_class;
 149                 rttl = rrecp->r_ttl;
 150                 /* overload class and type */
 151                 if (section == S_PREREQ) {
 152                         rttl = 0;
 153                         switch (rrecp->r_opcode) {
 154                         case YXDOMAIN:
 155                                 rclass = C_ANY;
 156                                 rtype = T_ANY;
 157                                 rrecp->r_size = 0;
 158                                 break;
 159                         case NXDOMAIN:
 160                                 rclass = C_NONE;
 161                                 rtype = T_ANY;
 162                                 rrecp->r_size = 0;
 163                                 break;
 164                         case NXRRSET:
 165                                 rclass = C_NONE;
 166                                 rrecp->r_size = 0;
 167                                 break;
 168                         case YXRRSET:
 169                                 if (rrecp->r_size == 0)
 170                                         rclass = C_ANY;
 171                                 break;
 172                         default:
 173                                 fprintf(stderr,
 174                                         "res_mkupdate: incorrect opcode: %d\n",
 175                                         rrecp->r_opcode);
 176                                 fflush(stderr);
 177                                 return (-1);
 178                         }
 179                 } else if (section == S_UPDATE) {
 180                         switch (rrecp->r_opcode) {
 181                         case DELETE:
 182                                 rclass = rrecp->r_size == 0 ? C_ANY : C_NONE;
 183                                 break;
 184                         case ADD:
 185                                 break;
 186                         default:
 187                                 fprintf(stderr,
 188                                         "res_mkupdate: incorrect opcode: %d\n",
 189                                         rrecp->r_opcode);
 190                                 fflush(stderr);
 191                                 return (-1);
 192                         }
 193                 }
 194
 195                 /*
 196                  * XXX  appending default domain to owner name is omitted,
 197                  *      fqdn must be provided
 198                  */
 199                 if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs,
 200                                  lastdnptr)) < 0)
 201                         return (-1);
 202                 cp += n;
 203                 ShrinkBuffer(n + 2*INT16SZ);
 204                 PUTSHORT(rtype, cp);
 205                 PUTSHORT(rclass, cp);
 206                 if (section == S_ZONE) {
 207                         if (numrrs != 1 || rrecp->r_type != T_SOA)
 208                                 return (-3);
 209                         continue;
 210                 }
 211                 ShrinkBuffer(INT32SZ + INT16SZ);
 212                 PUTLONG(rttl, cp);
 213                 sp2 = cp;  /*%< save pointer to length byte */
 214                 cp += INT16SZ;
 215                 if (rrecp->r_size == 0) {
 216                         if (section == S_UPDATE && rclass != C_ANY)
 217                                 return (-1);
 218                         else {
 219                                 PUTSHORT(0, sp2);
 220                                 continue;
 221                         }
 222                 }
 223                 startp = rrecp->r_data;
 224                 endp = startp + rrecp->r_size - 1;
 225                 /* XXX this should be done centrally. */
 226                 switch (rrecp->r_type) {
 227                 case T_A:
 228                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 229                                 return (-1);
 230                         if (!inet_aton(buf2, &ina))
 231                                 return (-1);
 232                         n1 = ntohl(ina.s_addr);
 233                         ShrinkBuffer(INT32SZ);
 234                         PUTLONG(n1, cp);
 235                         break;
 236                 case T_CNAME:
 237                 case T_MB:
 238                 case T_MG:
 239                 case T_MR:
 240                 case T_NS:
 241                 case T_PTR:
 242                 case ns_t_dname:
 243                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 244                                 return (-1);
 245                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 246                         if (n < 0)
 247                                 return (-1);
 248                         cp += n;
 249                         ShrinkBuffer(n);
 250                         break;
 251                 case T_MINFO:
 252                 case T_SOA:
 253                 case T_RP:
 254                         for (i = 0; i < 2; i++) {
 255                                 if (!getword_str(buf2, sizeof buf2, &startp,
 256                                                  endp))
 257                                 return (-1);
 258                                 n = dn_comp(buf2, cp, buflen,
 259                                             dnptrs, lastdnptr);
 260                                 if (n < 0)
 261                                         return (-1);
 262                                 cp += n;
 263                                 ShrinkBuffer(n);
 264                         }
 265                         if (rrecp->r_type == T_SOA) {
 266                                 ShrinkBuffer(5 * INT32SZ);
 267                                 while (isspace(*startp) || !*startp)
 268                                         startp++;
 269                                 if (*startp == '(') {
 270                                         multiline = 1;
 271                                         startp++;
 272                                 } else
 273                                         multiline = 0;
 274                                 /* serial, refresh, retry, expire, minimum */
 275                                 for (i = 0; i < 5; i++) {
 276                                         soanum = getnum_str(&startp, endp);
 277                                         if (soanum < 0)
 278                                                 return (-1);
 279                                         PUTLONG(soanum, cp);
 280                                 }
 281                                 if (multiline) {
 282                                         while (isspace(*startp) || !*startp)
 283                                                 startp++;
 284                                         if (*startp != ')')
 285                                                 return (-1);
 286                                 }
 287                         }
 288                         break;
 289                 case T_MX:
 290                 case T_AFSDB:
 291                 case T_RT:
 292                         n = getnum_str(&startp, endp);
 293                         if (n < 0)
 294                                 return (-1);
 295                         ShrinkBuffer(INT16SZ);
 296                         PUTSHORT(n, cp);
 297                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 298                                 return (-1);
 299                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 300                         if (n < 0)
 301                                 return (-1);
 302                         cp += n;
 303                         ShrinkBuffer(n);
 304                         break;
 305                 case T_SRV:
 306                         n = getnum_str(&startp, endp);
 307                         if (n < 0)
 308                                 return (-1);
 309                         ShrinkBuffer(INT16SZ);
 310                         PUTSHORT(n, cp);
 311
 312                         n = getnum_str(&startp, endp);
 313                         if (n < 0)
 314                                 return (-1);
 315                         ShrinkBuffer(INT16SZ);
 316                         PUTSHORT(n, cp);
 317
 318                         n = getnum_str(&startp, endp);
 319                         if (n < 0)
 320                                 return (-1);
 321                         ShrinkBuffer(INT16SZ);
 322                         PUTSHORT(n, cp);
 323
 324                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 325                                 return (-1);
 326                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 327                         if (n < 0)
 328                                 return (-1);
 329                         cp += n;
 330                         ShrinkBuffer(n);
 331                         break;
 332                 case T_PX:
 333                         n = getnum_str(&startp, endp);
 334                         if (n < 0)
 335                                 return (-1);
 336                         PUTSHORT(n, cp);
 337                         ShrinkBuffer(INT16SZ);
 338                         for (i = 0; i < 2; i++) {
 339                                 if (!getword_str(buf2, sizeof buf2, &startp,
 340                                                  endp))
 341                                         return (-1);
 342                                 n = dn_comp(buf2, cp, buflen, dnptrs,
 343                                             lastdnptr);
 344                                 if (n < 0)
 345                                         return (-1);
 346                                 cp += n;
 347                                 ShrinkBuffer(n);
 348                         }
 349                         break;
 350                 case T_WKS: {
 351                         char bm[MAXPORT/8];
 352                         unsigned int maxbm = 0;
 353
 354                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 355                                 return (-1);
 356                         if (!inet_aton(buf2, &ina))
 357                                 return (-1);
 358                         n1 = ntohl(ina.s_addr);
 359                         ShrinkBuffer(INT32SZ);
 360                         PUTLONG(n1, cp);
 361
 362                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 363                                 return (-1);
 364                         if ((i = res_protocolnumber(buf2)) < 0)
 365                                 return (-1);
 366                         ShrinkBuffer(1);
 367                         *cp++ = i & 0xff;
 368
 369                         for (i = 0; i < MAXPORT/8 ; i++)
 370                                 bm[i] = 0;
 371
 372                         while (getword_str(buf2, sizeof buf2, &startp, endp)) {
 373                                 if ((n = res_servicenumber(buf2)) <= 0)
 374                                         return (-1);
 375
 376                                 if (n < MAXPORT) {
 377                                         bm[n/8] |= (0x80>>(n%8));
 378                                         if ((unsigned)n > maxbm)
 379                                                 maxbm = n;
 380                                 } else
 381                                         return (-1);
 382                         }
 383                         maxbm = maxbm/8 + 1;
 384                         ShrinkBuffer(maxbm);
 385                         memcpy(cp, bm, maxbm);
 386                         cp += maxbm;
 387                         break;
 388                 }
 389                 case T_HINFO:
 390                         for (i = 0; i < 2; i++) {
 391                                 if ((n = getstr_str(buf2, sizeof buf2,
 392                                                 &startp, endp)) < 0)
 393                                         return (-1);
 394                                 if (n > 255)
 395                                         return (-1);
 396                                 ShrinkBuffer(n+1);
 397                                 *cp++ = n;
 398                                 memcpy(cp, buf2, n);
 399                                 cp += n;
 400                         }
 401                         break;
 402                 case T_TXT:
 403                         for (;;) {
 404                                 if ((n = getstr_str(buf2, sizeof buf2,
 405                                                 &startp, endp)) < 0) {
 406                                         if (cp != (sp2 + INT16SZ))
 407                                                 break;
 408                                         return (-1);
 409                                 }
 410                                 if (n > 255)
 411                                         return (-1);
 412                                 ShrinkBuffer(n+1);
 413                                 *cp++ = n;
 414                                 memcpy(cp, buf2, n);
 415                                 cp += n;
 416                         }
 417                         break;
 418                 case T_X25:
 419                         /* RFC1183 */
 420                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 421                                          endp)) < 0)
 422                                 return (-1);
 423                         if (n > 255)
 424                                 return (-1);
 425                         ShrinkBuffer(n+1);
 426                         *cp++ = n;
 427                         memcpy(cp, buf2, n);
 428                         cp += n;
 429                         break;
 430                 case T_ISDN:
 431                         /* RFC1183 */
 432                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 433                                          endp)) < 0)
 434                                 return (-1);
 435                         if ((n > 255) || (n == 0))
 436                                 return (-1);
 437                         ShrinkBuffer(n+1);
 438                         *cp++ = n;
 439                         memcpy(cp, buf2, n);
 440                         cp += n;
 441                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 442                                          endp)) < 0)
 443                                 n = 0;
 444                         if (n > 255)
 445                                 return (-1);
 446                         ShrinkBuffer(n+1);
 447                         *cp++ = n;
 448                         memcpy(cp, buf2, n);
 449                         cp += n;
 450                         break;
 451                 case T_NSAP:
 452                         if ((n = inet_nsap_addr((char *)startp, (u_char *)buf2, sizeof(buf2))) != 0) {
 453                                 ShrinkBuffer(n);
 454                                 memcpy(cp, buf2, n);
 455                                 cp += n;
 456                         } else {
 457                                 return (-1);
 458                         }
 459                         break;
 460                 case T_LOC:
 461                         if ((n = loc_aton((char *)startp, (u_char *)buf2)) != 0) {
 462                                 ShrinkBuffer(n);
 463                                 memcpy(cp, buf2, n);
 464                                 cp += n;
 465                         } else
 466                                 return (-1);
 467                         break;
 468                 case ns_t_sig:
 469 #ifdef _LIBC
 470                         return (-1);
 471 #else
 472                     {
 473                         int sig_type, success, dateerror;
 474                         u_int32_t exptime, timesigned;
 475
 476                         /* type */
 477                         if ((n = getword_str(buf2, sizeof buf2,
 478                                              &startp, endp)) < 0)
 479                                 return (-1);
 480                         sig_type = sym_ston(__p_type_syms, buf2, &success);
 481                         if (!success || sig_type == ns_t_any)
 482                                 return (-1);
 483                         ShrinkBuffer(INT16SZ);
 484                         PUTSHORT(sig_type, cp);
 485                         /* alg */
 486                         n = getnum_str(&startp, endp);
 487                         if (n < 0)
 488                                 return (-1);
 489                         ShrinkBuffer(1);
 490                         *cp++ = n;
 491                         /* labels */
 492                         n = getnum_str(&startp, endp);
 493                         if (n <= 0 || n > 255)
 494                                 return (-1);
 495                         ShrinkBuffer(1);
 496                         *cp++ = n;
 497                         /* ottl  & expire */
 498                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 499                                 return (-1);
 500                         exptime = ns_datetosecs(buf2, &dateerror);
 501                         if (!dateerror) {
 502                                 ShrinkBuffer(INT32SZ);
 503                                 PUTLONG(rttl, cp);
 504                         }
 505                         else {
 506                                 char *ulendp;
 507                                 u_int32_t ottl;
 508
 509                                 errno = 0;
 510                                 ottl = strtoul(buf2, &ulendp, 10);
 511                                 if (errno != 0 ||
 512                                     (ulendp != NULL && *ulendp != '\0'))
 513                                         return (-1);
 514                                 ShrinkBuffer(INT32SZ);
 515                                 PUTLONG(ottl, cp);
 516                                 if (!getword_str(buf2, sizeof buf2, &startp,
 517                                                  endp))
 518                                         return (-1);
 519                                 exptime = ns_datetosecs(buf2, &dateerror);
 520                                 if (dateerror)
 521                                         return (-1);
 522                         }
 523                         /* expire */
 524                         ShrinkBuffer(INT32SZ);
 525                         PUTLONG(exptime, cp);
 526                         /* timesigned */
 527                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 528                                 return (-1);
 529                         timesigned = ns_datetosecs(buf2, &dateerror);
 530                         if (!dateerror) {
 531                                 ShrinkBuffer(INT32SZ);
 532                                 PUTLONG(timesigned, cp);
 533                         }
 534                         else
 535                                 return (-1);
 536                         /* footprint */
 537                         n = getnum_str(&startp, endp);
 538                         if (n < 0)
 539                                 return (-1);
 540                         ShrinkBuffer(INT16SZ);
 541                         PUTSHORT(n, cp);
 542                         /* signer name */
 543                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 544                                 return (-1);
 545                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 546                         if (n < 0)
 547                                 return (-1);
 548                         cp += n;
 549                         ShrinkBuffer(n);
 550                         /* sig */
 551                         if ((n = getword_str(buf2, sizeof buf2,
 552                                              &startp, endp)) < 0)
 553                                 return (-1);
 554                         siglen = b64_pton(buf2, buf3, sizeof(buf3));
 555                         if (siglen < 0)
 556                                 return (-1);
 557                         ShrinkBuffer(siglen);
 558                         memcpy(cp, buf3, siglen);
 559                         cp += siglen;
 560                         break;
 561                     }
 562 #endif
 563                 case ns_t_key:
 564                         /* flags */
 565                         n = gethexnum_str(&startp, endp);
 566                         if (n < 0)
 567                                 return (-1);
 568                         ShrinkBuffer(INT16SZ);
 569                         PUTSHORT(n, cp);
 570                         /* proto */
 571                         n = getnum_str(&startp, endp);
 572                         if (n < 0)
 573                                 return (-1);
 574                         ShrinkBuffer(1);
 575                         *cp++ = n;
 576                         /* alg */
 577                         n = getnum_str(&startp, endp);
 578                         if (n < 0)
 579                                 return (-1);
 580                         ShrinkBuffer(1);
 581                         *cp++ = n;
 582                         /* key */
 583                         if ((n = getword_str(buf2, sizeof buf2,
 584                                              &startp, endp)) < 0)
 585                                 return (-1);
 586                         keylen = b64_pton(buf2, buf3, sizeof(buf3));
 587                         if (keylen < 0)
 588                                 return (-1);
 589                         ShrinkBuffer(keylen);
 590                         memcpy(cp, buf3, keylen);
 591                         cp += keylen;
 592                         break;
 593                 case ns_t_nxt:
 594                     {
 595                         int success, nxt_type;
 596                         u_char data[32];
 597                         int maxtype;
 598
 599                         /* next name */
 600                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 601                                 return (-1);
 602                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 603                         if (n < 0)
 604                                 return (-1);
 605                         cp += n;
 606                         ShrinkBuffer(n);
 607                         maxtype = 0;
 608                         memset(data, 0, sizeof data);
 609                         for (;;) {
 610                                 if (!getword_str(buf2, sizeof buf2, &startp,
 611                                                  endp))
 612                                         break;
 613                                 nxt_type = sym_ston(__p_type_syms, buf2,
 614                                                     &success);
 615                                 if (!success || !ns_t_rr_p(nxt_type))
 616                                         return (-1);
 617                                 NS_NXT_BIT_SET(nxt_type, data);
 618                                 if (nxt_type > maxtype)
 619                                         maxtype = nxt_type;
 620                         }
 621                         n = maxtype/NS_NXT_BITS+1;
 622                         ShrinkBuffer(n);
 623                         memcpy(cp, data, n);
 624                         cp += n;
 625                         break;
 626                     }
 627                 case ns_t_cert:
 628                         /* type */
 629                         n = getnum_str(&startp, endp);
 630                         if (n < 0)
 631                                 return (-1);
 632                         ShrinkBuffer(INT16SZ);
 633                         PUTSHORT(n, cp);
 634                         /* key tag */
 635                         n = getnum_str(&startp, endp);
 636                         if (n < 0)
 637                                 return (-1);
 638                         ShrinkBuffer(INT16SZ);
 639                         PUTSHORT(n, cp);
 640                         /* alg */
 641                         n = getnum_str(&startp, endp);
 642                         if (n < 0)
 643                                 return (-1);
 644                         ShrinkBuffer(1);
 645                         *cp++ = n;
 646                         /* cert */
 647                         if ((n = getword_str(buf2, sizeof buf2,
 648                                              &startp, endp)) < 0)
 649                                 return (-1);
 650                         certlen = b64_pton(buf2, buf3, sizeof(buf3));
 651                         if (certlen < 0)
 652                                 return (-1);
 653                         ShrinkBuffer(certlen);
 654                         memcpy(cp, buf3, certlen);
 655                         cp += certlen;
 656                         break;
 657                 case ns_t_aaaa:
 658                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 659                                 return (-1);
 660                         if (inet_pton(AF_INET6, buf2, &in6a) <= 0)
 661                                 return (-1);
 662                         ShrinkBuffer(NS_IN6ADDRSZ);
 663                         memcpy(cp, &in6a, NS_IN6ADDRSZ);
 664                         cp += NS_IN6ADDRSZ;
 665                         break;
 666                 case ns_t_naptr:
 667                         /* Order Preference Flags Service Replacement Regexp */
 668                         /* Order */
 669                         n = getnum_str(&startp, endp);
 670                         if (n < 0 || n > 65535)
 671                                 return (-1);
 672                         ShrinkBuffer(INT16SZ);
 673                         PUTSHORT(n, cp);
 674                         /* Preference */
 675                         n = getnum_str(&startp, endp);
 676                         if (n < 0 || n > 65535)
 677                                 return (-1);
 678                         ShrinkBuffer(INT16SZ);
 679                         PUTSHORT(n, cp);
 680                         /* Flags */
 681                         if ((n = getstr_str(buf2, sizeof buf2,
 682                                         &startp, endp)) < 0) {
 683                                 return (-1);
 684                         }
 685                         if (n > 255)
 686                                 return (-1);
 687                         ShrinkBuffer(n+1);
 688                         *cp++ = n;
 689                         memcpy(cp, buf2, n);
 690                         cp += n;
 691                         /* Service Classes */
 692                         if ((n = getstr_str(buf2, sizeof buf2,
 693                                         &startp, endp)) < 0) {
 694                                 return (-1);
 695                         }
 696                         if (n > 255)
 697                                 return (-1);
 698                         ShrinkBuffer(n+1);
 699                         *cp++ = n;
 700                         memcpy(cp, buf2, n);
 701                         cp += n;
 702                         /* Pattern */
 703                         if ((n = getstr_str(buf2, sizeof buf2,
 704                                         &startp, endp)) < 0) {
 705                                 return (-1);
 706                         }
 707                         if (n > 255)
 708                                 return (-1);
 709                         ShrinkBuffer(n+1);
 710                         *cp++ = n;
 711                         memcpy(cp, buf2, n);
 712                         cp += n;
 713                         /* Replacement */
 714                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 715                                 return (-1);
 716                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 717                         if (n < 0)
 718                                 return (-1);
 719                         cp += n;
 720                         ShrinkBuffer(n);
 721                         break;
 722                 default:
 723                         return (-1);
 724                 } /*switch*/
 725                 n = (u_int16_t)((cp - sp2) - INT16SZ);
 726                 PUTSHORT(n, sp2);
 727         } /*for*/
 728
 729         hp->qdcount = htons(counts[0]);
 730         hp->ancount = htons(counts[1]);
 731         hp->nscount = htons(counts[2]);
 732         hp->arcount = htons(counts[3]);
 733         return (cp - buf);
 734 }
 735
 736 /*%
 737  * Get a whitespace delimited word from a string (not file)
 738  * into buf. modify the start pointer to point after the
 739  * word in the string.
 740  */
 741 static int
 742 getword_str(char *buf, int size, u_char **startpp, u_char *endp) {
 743         char *cp;
 744         int c;
 745
 746         for (cp = buf; *startpp <= endp; ) {
 747                 c = **startpp;
 748                 if (isspace(c) || c == '\0') {
 749                         if (cp != buf) /*%< trailing whitespace */
 750                                 break;
 751                         else { /*%< leading whitespace */
 752                                 (*startpp)++;
 753                                 continue;
 754                         }
 755                 }
 756                 (*startpp)++;
 757                 if (cp >= buf+size-1)
 758                         break;
 759                 *cp++ = (u_char)c;
 760         }
 761         *cp = '\0';
 762         return (cp != buf);
 763 }
 764
 765 /*%
 766  * get a white spae delimited string from memory.  Process quoted strings
 767  * and \\DDD escapes.  Return length or -1 on error.  Returned string may
 768  * contain nulls.
 769  */
 770 static char digits[] = "0123456789";
 771 static int
 772 getstr_str(char *buf, int size, u_char **startpp, u_char *endp) {
 773         char *cp;
 774         int c, c1 = 0;
 775         int inquote = 0;
 776         int seen_quote = 0;
 777         int escape = 0;
 778         int dig = 0;
 779
 780         for (cp = buf; *startpp <= endp; ) {
 781                 if ((c = **startpp) == '\0')
 782                         break;
 783                 /* leading white space */
 784                 if ((cp == buf) && !seen_quote && isspace(c)) {
 785                         (*startpp)++;
 786                         continue;
 787                 }
 788
 789                 switch (c) {
 790                 case '\\':
 791                         if (!escape)  {
 792                                 escape = 1;
 793                                 dig = 0;
 794                                 c1 = 0;
 795                                 (*startpp)++;
 796                                 continue;
 797                         }
 798                         goto do_escape;
 799                 case '"':
 800                         if (!escape) {
 801                                 inquote = !inquote;
 802                                 seen_quote = 1;
 803                                 (*startpp)++;
 804                                 continue;
 805                         }
 806                         /* fall through */
 807                 default:
 808                 do_escape:
 809                         if (escape) {
 810                                 switch (c) {
 811                                 case '0':
 812                                 case '1':
 813                                 case '2':
 814                                 case '3':
 815                                 case '4':
 816                                 case '5':
 817                                 case '6':
 818                                 case '7':
 819                                 case '8':
 820                                 case '9':
 821                                         c1 = c1 * 10 +
 822                                                 (strchr(digits, c) - digits);
 823
 824                                         if (++dig == 3) {
 825                                                 c = c1 &0xff;
 826                                                 break;
 827                                         }
 828                                         (*startpp)++;
 829                                         continue;
 830                                 }
 831                                 escape = 0;
 832                         } else if (!inquote && isspace(c))
 833                                 goto done;
 834                         if (cp >= buf+size-1)
 835                                 goto done;
 836                         *cp++ = (u_char)c;
 837                         (*startpp)++;
 838                 }
 839         }
 840  done:
 841         *cp = '\0';
 842         return ((cp == buf)?  (seen_quote? 0: -1): (cp - buf));
 843 }
 844
 845 /*%
 846  * Get a whitespace delimited base 16 number from a string (not file) into buf
 847  * update the start pointer to point after the number in the string.
 848  */
 849 static int
 850 gethexnum_str(u_char **startpp, u_char *endp) {
 851         int c, n;
 852         int seendigit = 0;
 853         int m = 0;
 854
 855         if (*startpp + 2 >= endp || strncasecmp((char *)*startpp, "0x", 2) != 0)
 856                 return getnum_str(startpp, endp);
 857         (*startpp)+=2;
 858         for (n = 0; *startpp <= endp; ) {
 859                 c = **startpp;
 860                 if (isspace(c) || c == '\0') {
 861                         if (seendigit) /*%< trailing whitespace */
 862                                 break;
 863                         else { /*%< leading whitespace */
 864                                 (*startpp)++;
 865                                 continue;
 866                         }
 867                 }
 868                 if (c == ';') {
 869                         while ((*startpp <= endp) &&
 870                                ((c = **startpp) != '\n'))
 871                                         (*startpp)++;
 872                         if (seendigit)
 873                                 break;
 874                         continue;
 875                 }
 876                 if (!isxdigit(c)) {
 877                         if (c == ')' && seendigit) {
 878                                 (*startpp)--;
 879                                 break;
 880                         }
 881                         return (-1);
 882                 }
 883                 (*startpp)++;
 884                 if (isdigit(c))
 885                         n = n * 16 + (c - '0');
 886                 else
 887                         n = n * 16 + (tolower(c) - 'a' + 10);
 888                 seendigit = 1;
 889         }
 890         return (n + m);
 891 }
 892
 893 /*%
 894  * Get a whitespace delimited base 10 number from a string (not file) into buf
 895  * update the start pointer to point after the number in the string.
 896  */
 897 static int
 898 getnum_str(u_char **startpp, u_char *endp) {
 899         int c, n;
 900         int seendigit = 0;
 901         int m = 0;
 902
 903         for (n = 0; *startpp <= endp; ) {
 904                 c = **startpp;
 905                 if (isspace(c) || c == '\0') {
 906                         if (seendigit) /*%< trailing whitespace */
 907                                 break;
 908                         else { /*%< leading whitespace */
 909                                 (*startpp)++;
 910                                 continue;
 911                         }
 912                 }
 913                 if (c == ';') {
 914                         while ((*startpp <= endp) &&
 915                                ((c = **startpp) != '\n'))
 916                                         (*startpp)++;
 917                         if (seendigit)
 918                                 break;
 919                         continue;
 920                 }
 921                 if (!isdigit(c)) {
 922                         if (c == ')' && seendigit) {
 923                                 (*startpp)--;
 924                                 break;
 925                         }
 926                         return (-1);
 927                 }
 928                 (*startpp)++;
 929                 n = n * 10 + (c - '0');
 930                 seendigit = 1;
 931         }
 932         return (n + m);
 933 }
 934
 935 /*%
 936  * Allocate a resource record buffer & save rr info.
 937  */
 938 ns_updrec *
 939 res_mkupdrec(int section, const char *dname,
 940              u_int class, u_int type, u_long ttl) {
 941         ns_updrec *rrecp = (ns_updrec *)calloc(1, sizeof(ns_updrec));
 942
 943         if (!rrecp || !(rrecp->r_dname = strdup(dname))) {
 944                 if (rrecp)
 945                         free((char *)rrecp);
 946                 return (NULL);
 947         }
 948         INIT_LINK(rrecp, r_link);
 949         INIT_LINK(rrecp, r_glink);
 950         rrecp->r_class = (ns_class)class;
 951         rrecp->r_type = (ns_type)type;
 952         rrecp->r_ttl = ttl;
 953         rrecp->r_section = (ns_sect)section;
 954         return (rrecp);
 955 }
 956
 957 /*%
 958  * Free a resource record buffer created by res_mkupdrec.
 959  */
 960 void
 961 res_freeupdrec(ns_updrec *rrecp) {
 962         /* Note: freeing r_dp is the caller's responsibility. */
 963         if (rrecp->r_dname != NULL)
 964                 free(rrecp->r_dname);
 965         free(rrecp);
 966 }
 967
 968 struct valuelist {
 969         struct valuelist *      next;
 970         struct valuelist *      prev;
 971         char *                  name;
 972         char *                  proto;
 973         int                     port;
 974 };
 975 static struct valuelist *servicelist, *protolist;
 976
 977 static void
 978 res_buildservicelist() {
 979         struct servent *sp;
 980         struct valuelist *slp;
 981
 982 #ifdef MAYBE_HESIOD
 983         setservent(0);
 984 #else
 985         setservent(1);
 986 #endif
 987         while ((sp = getservent()) != NULL) {
 988                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
 989                 if (!slp)
 990                         break;
 991                 slp->name = strdup(sp->s_name);
 992                 slp->proto = strdup(sp->s_proto);
 993                 if ((slp->name == NULL) || (slp->proto == NULL)) {
 994                         if (slp->name) free(slp->name);
 995                         if (slp->proto) free(slp->proto);
 996                         free(slp);
 997                         break;
 998                 }
 999                 slp->port = ntohs((u_int16_t)sp->s_port);  /*%< host byt order */
1000                 slp->next = servicelist;
1001                 slp->prev = NULL;
1002                 if (servicelist)
1003                         servicelist->prev = slp;
1004                 servicelist = slp;
1005         }
1006         endservent();
1007 }
1008
1009 #ifndef _LIBC
1010 void
1011 res_destroyservicelist() {
1012         struct valuelist *slp, *slp_next;
1013
1014         for (slp = servicelist; slp != NULL; slp = slp_next) {
1015                 slp_next = slp->next;
1016                 free(slp->name);
1017                 free(slp->proto);
1018                 free(slp);
1019         }
1020         servicelist = (struct valuelist *)0;
1021 }
1022 #endif
1023
1024 #ifdef _LIBC
1025 static
1026 #endif
1027 void
1028 res_buildprotolist(void) {
1029         struct protoent *pp;
1030         struct valuelist *slp;
1031
1032 #ifdef MAYBE_HESIOD
1033         setprotoent(0);
1034 #else
1035         setprotoent(1);
1036 #endif
1037         while ((pp = getprotoent()) != NULL) {
1038                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
1039                 if (!slp)
1040                         break;
1041                 slp->name = strdup(pp->p_name);
1042                 if (slp->name == NULL) {
1043                         free(slp);
1044                         break;
1045                 }
1046                 slp->port = pp->p_proto;        /*%< host byte order */
1047                 slp->next = protolist;
1048                 slp->prev = NULL;
1049                 if (protolist)
1050                         protolist->prev = slp;
1051                 protolist = slp;
1052         }
1053         endprotoent();
1054 }
1055
1056 #ifndef _LIBC
1057 void
1058 res_destroyprotolist(void) {
1059         struct valuelist *plp, *plp_next;
1060
1061         for (plp = protolist; plp != NULL; plp = plp_next) {
1062                 plp_next = plp->next;
1063                 free(plp->name);
1064                 free(plp);
1065         }
1066         protolist = (struct valuelist *)0;
1067 }
1068 #endif
1069
1070 static int
1071 findservice(const char *s, struct valuelist **list) {
1072         struct valuelist *lp = *list;
1073         int n;
1074
1075         for (; lp != NULL; lp = lp->next)
1076                 if (strcasecmp(lp->name, s) == 0) {
1077                         if (lp != *list) {
1078                                 lp->prev->next = lp->next;
1079                                 if (lp->next)
1080                                         lp->next->prev = lp->prev;
1081                                 (*list)->prev = lp;
1082                                 lp->next = *list;
1083                                 *list = lp;
1084                         }
1085                         return (lp->port);      /*%< host byte order */
1086                 }
1087         if (sscanf(s, "%d", &n) != 1 || n <= 0)
1088                 n = -1;
1089         return (n);
1090 }
1091
1092 /*%
1093  * Convert service name or (ascii) number to int.
1094  */
1095 #ifdef _LIBC
1096 static
1097 #endif
1098 int
1099 res_servicenumber(const char *p) {
1100         if (servicelist == (struct valuelist *)0)
1101                 res_buildservicelist();
1102         return (findservice(p, &servicelist));
1103 }
1104
1105 /*%
1106  * Convert protocol name or (ascii) number to int.
1107  */
1108 #ifdef _LIBC
1109 static
1110 #endif
1111 int
1112 res_protocolnumber(const char *p) {
1113         if (protolist == (struct valuelist *)0)
1114                 res_buildprotolist();
1115         return (findservice(p, &protolist));
1116 }
1117
1118 #ifndef _LIBC
1119 static struct servent *
1120 cgetservbyport(u_int16_t port, const char *proto) {     /*%< Host byte order. */
1121         struct valuelist **list = &servicelist;
1122         struct valuelist *lp = *list;
1123         static struct servent serv;
1124
1125         port = ntohs(port);
1126         for (; lp != NULL; lp = lp->next) {
1127                 if (port != (u_int16_t)lp->port)        /*%< Host byte order. */
1128                         continue;
1129                 if (strcasecmp(lp->proto, proto) == 0) {
1130                         if (lp != *list) {
1131                                 lp->prev->next = lp->next;
1132                                 if (lp->next)
1133                                         lp->next->prev = lp->prev;
1134                                 (*list)->prev = lp;
1135                                 lp->next = *list;
1136                                 *list = lp;
1137                         }
1138                         serv.s_name = lp->name;
1139                         serv.s_port = htons((u_int16_t)lp->port);
1140                         serv.s_proto = lp->proto;
1141                         return (&serv);
1142                 }
1143         }
1144         return (0);
1145 }
1146
1147 static struct protoent *
1148 cgetprotobynumber(int proto) {                          /*%< Host byte order. */
1149         struct valuelist **list = &protolist;
1150         struct valuelist *lp = *list;
1151         static struct protoent prot;
1152
1153         for (; lp != NULL; lp = lp->next)
1154                 if (lp->port == proto) {                /*%< Host byte order. */
1155                         if (lp != *list) {
1156                                 lp->prev->next = lp->next;
1157                                 if (lp->next)
1158                                         lp->next->prev = lp->prev;
1159                                 (*list)->prev = lp;
1160                                 lp->next = *list;
1161                                 *list = lp;
1162                         }
1163                         prot.p_name = lp->name;
1164                         prot.p_proto = lp->port;        /*%< Host byte order. */
1165                         return (&prot);
1166                 }
1167         return (0);
1168 }
1169
1170 const char *
1171 res_protocolname(int num) {
1172         static char number[8];
1173         struct protoent *pp;
1174
1175         if (protolist == (struct valuelist *)0)
1176                 res_buildprotolist();
1177         pp = cgetprotobynumber(num);
1178         if (pp == 0)  {
1179                 (void) sprintf(number, "%d", num);
1180                 return (number);
1181         }
1182         return (pp->p_name);
1183 }
1184
1185 const char *
1186 res_servicename(u_int16_t port, const char *proto) {    /*%< Host byte order. */
1187         static char number[8];
1188         struct servent *ss;
1189
1190         if (servicelist == (struct valuelist *)0)
1191                 res_buildservicelist();
1192         ss = cgetservbyport(htons(port), proto);
1193         if (ss == 0)  {
1194                 (void) sprintf(number, "%d", port);
1195                 return (number);
1196         }
1197         return (ss->s_name);
1198 }
1199 #endif