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 1.4.18.4 2005/10/14 05:44:12 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         hp->id = htons(++statp->id);
 120         hp->opcode = ns_o_update;
 121         hp->rcode = NOERROR;
 122         cp = buf + HFIXEDSZ;
 123         buflen -= HFIXEDSZ;
 124         dpp = dnptrs;
 125         *dpp++ = buf;
 126         *dpp++ = NULL;
 127         lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
 128
 129         if (rrecp_start == NULL)
 130                 return (-5);
 131         else if (rrecp_start->r_section != S_ZONE)
 132                 return (-3);
 133
 134         memset(counts, 0, sizeof counts);
 135         for (rrecp = rrecp_start; rrecp; rrecp = NEXT(rrecp, r_glink)) {
 136                 numrrs++;
 137                 section = rrecp->r_section;
 138                 if (section < 0 || section >= ns_s_max)
 139                         return (-1);
 140                 counts[section]++;
 141                 for (i = section + 1; i < ns_s_max; i++)
 142                         if (counts[i])
 143                                 return (-3);
 144                 rtype = rrecp->r_type;
 145                 rclass = rrecp->r_class;
 146                 rttl = rrecp->r_ttl;
 147                 /* overload class and type */
 148                 if (section == S_PREREQ) {
 149                         rttl = 0;
 150                         switch (rrecp->r_opcode) {
 151                         case YXDOMAIN:
 152                                 rclass = C_ANY;
 153                                 rtype = T_ANY;
 154                                 rrecp->r_size = 0;
 155                                 break;
 156                         case NXDOMAIN:
 157                                 rclass = C_NONE;
 158                                 rtype = T_ANY;
 159                                 rrecp->r_size = 0;
 160                                 break;
 161                         case NXRRSET:
 162                                 rclass = C_NONE;
 163                                 rrecp->r_size = 0;
 164                                 break;
 165                         case YXRRSET:
 166                                 if (rrecp->r_size == 0)
 167                                         rclass = C_ANY;
 168                                 break;
 169                         default:
 170                                 fprintf(stderr,
 171                                         "res_mkupdate: incorrect opcode: %d\n",
 172                                         rrecp->r_opcode);
 173                                 fflush(stderr);
 174                                 return (-1);
 175                         }
 176                 } else if (section == S_UPDATE) {
 177                         switch (rrecp->r_opcode) {
 178                         case DELETE:
 179                                 rclass = rrecp->r_size == 0 ? C_ANY : C_NONE;
 180                                 break;
 181                         case ADD:
 182                                 break;
 183                         default:
 184                                 fprintf(stderr,
 185                                         "res_mkupdate: incorrect opcode: %d\n",
 186                                         rrecp->r_opcode);
 187                                 fflush(stderr);
 188                                 return (-1);
 189                         }
 190                 }
 191
 192                 /*
 193                  * XXX  appending default domain to owner name is omitted,
 194                  *      fqdn must be provided
 195                  */
 196                 if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs,
 197                                  lastdnptr)) < 0)
 198                         return (-1);
 199                 cp += n;
 200                 ShrinkBuffer(n + 2*INT16SZ);
 201                 PUTSHORT(rtype, cp);
 202                 PUTSHORT(rclass, cp);
 203                 if (section == S_ZONE) {
 204                         if (numrrs != 1 || rrecp->r_type != T_SOA)
 205                                 return (-3);
 206                         continue;
 207                 }
 208                 ShrinkBuffer(INT32SZ + INT16SZ);
 209                 PUTLONG(rttl, cp);
 210                 sp2 = cp;  /*%< save pointer to length byte */
 211                 cp += INT16SZ;
 212                 if (rrecp->r_size == 0) {
 213                         if (section == S_UPDATE && rclass != C_ANY)
 214                                 return (-1);
 215                         else {
 216                                 PUTSHORT(0, sp2);
 217                                 continue;
 218                         }
 219                 }
 220                 startp = rrecp->r_data;
 221                 endp = startp + rrecp->r_size - 1;
 222                 /* XXX this should be done centrally. */
 223                 switch (rrecp->r_type) {
 224                 case T_A:
 225                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 226                                 return (-1);
 227                         if (!inet_aton(buf2, &ina))
 228                                 return (-1);
 229                         n1 = ntohl(ina.s_addr);
 230                         ShrinkBuffer(INT32SZ);
 231                         PUTLONG(n1, cp);
 232                         break;
 233                 case T_CNAME:
 234                 case T_MB:
 235                 case T_MG:
 236                 case T_MR:
 237                 case T_NS:
 238                 case T_PTR:
 239                 case ns_t_dname:
 240                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 241                                 return (-1);
 242                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 243                         if (n < 0)
 244                                 return (-1);
 245                         cp += n;
 246                         ShrinkBuffer(n);
 247                         break;
 248                 case T_MINFO:
 249                 case T_SOA:
 250                 case T_RP:
 251                         for (i = 0; i < 2; i++) {
 252                                 if (!getword_str(buf2, sizeof buf2, &startp,
 253                                                  endp))
 254                                 return (-1);
 255                                 n = dn_comp(buf2, cp, buflen,
 256                                             dnptrs, lastdnptr);
 257                                 if (n < 0)
 258                                         return (-1);
 259                                 cp += n;
 260                                 ShrinkBuffer(n);
 261                         }
 262                         if (rrecp->r_type == T_SOA) {
 263                                 ShrinkBuffer(5 * INT32SZ);
 264                                 while (isspace(*startp) || !*startp)
 265                                         startp++;
 266                                 if (*startp == '(') {
 267                                         multiline = 1;
 268                                         startp++;
 269                                 } else
 270                                         multiline = 0;
 271                                 /* serial, refresh, retry, expire, minimum */
 272                                 for (i = 0; i < 5; i++) {
 273                                         soanum = getnum_str(&startp, endp);
 274                                         if (soanum < 0)
 275                                                 return (-1);
 276                                         PUTLONG(soanum, cp);
 277                                 }
 278                                 if (multiline) {
 279                                         while (isspace(*startp) || !*startp)
 280                                                 startp++;
 281                                         if (*startp != ')')
 282                                                 return (-1);
 283                                 }
 284                         }
 285                         break;
 286                 case T_MX:
 287                 case T_AFSDB:
 288                 case T_RT:
 289                         n = getnum_str(&startp, endp);
 290                         if (n < 0)
 291                                 return (-1);
 292                         ShrinkBuffer(INT16SZ);
 293                         PUTSHORT(n, cp);
 294                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 295                                 return (-1);
 296                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 297                         if (n < 0)
 298                                 return (-1);
 299                         cp += n;
 300                         ShrinkBuffer(n);
 301                         break;
 302                 case T_SRV:
 303                         n = getnum_str(&startp, endp);
 304                         if (n < 0)
 305                                 return (-1);
 306                         ShrinkBuffer(INT16SZ);
 307                         PUTSHORT(n, cp);
 308
 309                         n = getnum_str(&startp, endp);
 310                         if (n < 0)
 311                                 return (-1);
 312                         ShrinkBuffer(INT16SZ);
 313                         PUTSHORT(n, cp);
 314
 315                         n = getnum_str(&startp, endp);
 316                         if (n < 0)
 317                                 return (-1);
 318                         ShrinkBuffer(INT16SZ);
 319                         PUTSHORT(n, cp);
 320
 321                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 322                                 return (-1);
 323                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 324                         if (n < 0)
 325                                 return (-1);
 326                         cp += n;
 327                         ShrinkBuffer(n);
 328                         break;
 329                 case T_PX:
 330                         n = getnum_str(&startp, endp);
 331                         if (n < 0)
 332                                 return (-1);
 333                         PUTSHORT(n, cp);
 334                         ShrinkBuffer(INT16SZ);
 335                         for (i = 0; i < 2; i++) {
 336                                 if (!getword_str(buf2, sizeof buf2, &startp,
 337                                                  endp))
 338                                         return (-1);
 339                                 n = dn_comp(buf2, cp, buflen, dnptrs,
 340                                             lastdnptr);
 341                                 if (n < 0)
 342                                         return (-1);
 343                                 cp += n;
 344                                 ShrinkBuffer(n);
 345                         }
 346                         break;
 347                 case T_WKS: {
 348                         char bm[MAXPORT/8];
 349                         unsigned int maxbm = 0;
 350
 351                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 352                                 return (-1);
 353                         if (!inet_aton(buf2, &ina))
 354                                 return (-1);
 355                         n1 = ntohl(ina.s_addr);
 356                         ShrinkBuffer(INT32SZ);
 357                         PUTLONG(n1, cp);
 358
 359                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 360                                 return (-1);
 361                         if ((i = res_protocolnumber(buf2)) < 0)
 362                                 return (-1);
 363                         ShrinkBuffer(1);
 364                         *cp++ = i & 0xff;
 365
 366                         for (i = 0; i < MAXPORT/8 ; i++)
 367                                 bm[i] = 0;
 368
 369                         while (getword_str(buf2, sizeof buf2, &startp, endp)) {
 370                                 if ((n = res_servicenumber(buf2)) <= 0)
 371                                         return (-1);
 372
 373                                 if (n < MAXPORT) {
 374                                         bm[n/8] |= (0x80>>(n%8));
 375                                         if ((unsigned)n > maxbm)
 376                                                 maxbm = n;
 377                                 } else
 378                                         return (-1);
 379                         }
 380                         maxbm = maxbm/8 + 1;
 381                         ShrinkBuffer(maxbm);
 382                         memcpy(cp, bm, maxbm);
 383                         cp += maxbm;
 384                         break;
 385                 }
 386                 case T_HINFO:
 387                         for (i = 0; i < 2; i++) {
 388                                 if ((n = getstr_str(buf2, sizeof buf2,
 389                                                 &startp, endp)) < 0)
 390                                         return (-1);
 391                                 if (n > 255)
 392                                         return (-1);
 393                                 ShrinkBuffer(n+1);
 394                                 *cp++ = n;
 395                                 memcpy(cp, buf2, n);
 396                                 cp += n;
 397                         }
 398                         break;
 399                 case T_TXT:
 400                         for (;;) {
 401                                 if ((n = getstr_str(buf2, sizeof buf2,
 402                                                 &startp, endp)) < 0) {
 403                                         if (cp != (sp2 + INT16SZ))
 404                                                 break;
 405                                         return (-1);
 406                                 }
 407                                 if (n > 255)
 408                                         return (-1);
 409                                 ShrinkBuffer(n+1);
 410                                 *cp++ = n;
 411                                 memcpy(cp, buf2, n);
 412                                 cp += n;
 413                         }
 414                         break;
 415                 case T_X25:
 416                         /* RFC1183 */
 417                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 418                                          endp)) < 0)
 419                                 return (-1);
 420                         if (n > 255)
 421                                 return (-1);
 422                         ShrinkBuffer(n+1);
 423                         *cp++ = n;
 424                         memcpy(cp, buf2, n);
 425                         cp += n;
 426                         break;
 427                 case T_ISDN:
 428                         /* RFC1183 */
 429                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 430                                          endp)) < 0)
 431                                 return (-1);
 432                         if ((n > 255) || (n == 0))
 433                                 return (-1);
 434                         ShrinkBuffer(n+1);
 435                         *cp++ = n;
 436                         memcpy(cp, buf2, n);
 437                         cp += n;
 438                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 439                                          endp)) < 0)
 440                                 n = 0;
 441                         if (n > 255)
 442                                 return (-1);
 443                         ShrinkBuffer(n+1);
 444                         *cp++ = n;
 445                         memcpy(cp, buf2, n);
 446                         cp += n;
 447                         break;
 448                 case T_NSAP:
 449                         if ((n = inet_nsap_addr((char *)startp, (u_char *)buf2, sizeof(buf2))) != 0) {
 450                                 ShrinkBuffer(n);
 451                                 memcpy(cp, buf2, n);
 452                                 cp += n;
 453                         } else {
 454                                 return (-1);
 455                         }
 456                         break;
 457                 case T_LOC:
 458                         if ((n = loc_aton((char *)startp, (u_char *)buf2)) != 0) {
 459                                 ShrinkBuffer(n);
 460                                 memcpy(cp, buf2, n);
 461                                 cp += n;
 462                         } else
 463                                 return (-1);
 464                         break;
 465                 case ns_t_sig:
 466 #ifdef _LIBC
 467                         return (-1);
 468 #else
 469                     {
 470                         int sig_type, success, dateerror;
 471                         u_int32_t exptime, timesigned;
 472
 473                         /* type */
 474                         if ((n = getword_str(buf2, sizeof buf2,
 475                                              &startp, endp)) < 0)
 476                                 return (-1);
 477                         sig_type = sym_ston(__p_type_syms, buf2, &success);
 478                         if (!success || sig_type == ns_t_any)
 479                                 return (-1);
 480                         ShrinkBuffer(INT16SZ);
 481                         PUTSHORT(sig_type, cp);
 482                         /* alg */
 483                         n = getnum_str(&startp, endp);
 484                         if (n < 0)
 485                                 return (-1);
 486                         ShrinkBuffer(1);
 487                         *cp++ = n;
 488                         /* labels */
 489                         n = getnum_str(&startp, endp);
 490                         if (n <= 0 || n > 255)
 491                                 return (-1);
 492                         ShrinkBuffer(1);
 493                         *cp++ = n;
 494                         /* ottl  & expire */
 495                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 496                                 return (-1);
 497                         exptime = ns_datetosecs(buf2, &dateerror);
 498                         if (!dateerror) {
 499                                 ShrinkBuffer(INT32SZ);
 500                                 PUTLONG(rttl, cp);
 501                         }
 502                         else {
 503                                 char *ulendp;
 504                                 u_int32_t ottl;
 505
 506                                 errno = 0;
 507                                 ottl = strtoul(buf2, &ulendp, 10);
 508                                 if (errno != 0 ||
 509                                     (ulendp != NULL && *ulendp != '\0'))
 510                                         return (-1);
 511                                 ShrinkBuffer(INT32SZ);
 512                                 PUTLONG(ottl, cp);
 513                                 if (!getword_str(buf2, sizeof buf2, &startp,
 514                                                  endp))
 515                                         return (-1);
 516                                 exptime = ns_datetosecs(buf2, &dateerror);
 517                                 if (dateerror)
 518                                         return (-1);
 519                         }
 520                         /* expire */
 521                         ShrinkBuffer(INT32SZ);
 522                         PUTLONG(exptime, cp);
 523                         /* timesigned */
 524                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 525                                 return (-1);
 526                         timesigned = ns_datetosecs(buf2, &dateerror);
 527                         if (!dateerror) {
 528                                 ShrinkBuffer(INT32SZ);
 529                                 PUTLONG(timesigned, cp);
 530                         }
 531                         else
 532                                 return (-1);
 533                         /* footprint */
 534                         n = getnum_str(&startp, endp);
 535                         if (n < 0)
 536                                 return (-1);
 537                         ShrinkBuffer(INT16SZ);
 538                         PUTSHORT(n, cp);
 539                         /* signer name */
 540                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 541                                 return (-1);
 542                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 543                         if (n < 0)
 544                                 return (-1);
 545                         cp += n;
 546                         ShrinkBuffer(n);
 547                         /* sig */
 548                         if ((n = getword_str(buf2, sizeof buf2,
 549                                              &startp, endp)) < 0)
 550                                 return (-1);
 551                         siglen = b64_pton(buf2, buf3, sizeof(buf3));
 552                         if (siglen < 0)
 553                                 return (-1);
 554                         ShrinkBuffer(siglen);
 555                         memcpy(cp, buf3, siglen);
 556                         cp += siglen;
 557                         break;
 558                     }
 559 #endif
 560                 case ns_t_key:
 561                         /* flags */
 562                         n = gethexnum_str(&startp, endp);
 563                         if (n < 0)
 564                                 return (-1);
 565                         ShrinkBuffer(INT16SZ);
 566                         PUTSHORT(n, cp);
 567                         /* proto */
 568                         n = getnum_str(&startp, endp);
 569                         if (n < 0)
 570                                 return (-1);
 571                         ShrinkBuffer(1);
 572                         *cp++ = n;
 573                         /* alg */
 574                         n = getnum_str(&startp, endp);
 575                         if (n < 0)
 576                                 return (-1);
 577                         ShrinkBuffer(1);
 578                         *cp++ = n;
 579                         /* key */
 580                         if ((n = getword_str(buf2, sizeof buf2,
 581                                              &startp, endp)) < 0)
 582                                 return (-1);
 583                         keylen = b64_pton(buf2, buf3, sizeof(buf3));
 584                         if (keylen < 0)
 585                                 return (-1);
 586                         ShrinkBuffer(keylen);
 587                         memcpy(cp, buf3, keylen);
 588                         cp += keylen;
 589                         break;
 590                 case ns_t_nxt:
 591                     {
 592                         int success, nxt_type;
 593                         u_char data[32];
 594                         int maxtype;
 595
 596                         /* next name */
 597                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 598                                 return (-1);
 599                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 600                         if (n < 0)
 601                                 return (-1);
 602                         cp += n;
 603                         ShrinkBuffer(n);
 604                         maxtype = 0;
 605                         memset(data, 0, sizeof data);
 606                         for (;;) {
 607                                 if (!getword_str(buf2, sizeof buf2, &startp,
 608                                                  endp))
 609                                         break;
 610                                 nxt_type = sym_ston(__p_type_syms, buf2,
 611                                                     &success);
 612                                 if (!success || !ns_t_rr_p(nxt_type))
 613                                         return (-1);
 614                                 NS_NXT_BIT_SET(nxt_type, data);
 615                                 if (nxt_type > maxtype)
 616                                         maxtype = nxt_type;
 617                         }
 618                         n = maxtype/NS_NXT_BITS+1;
 619                         ShrinkBuffer(n);
 620                         memcpy(cp, data, n);
 621                         cp += n;
 622                         break;
 623                     }
 624                 case ns_t_cert:
 625                         /* type */
 626                         n = getnum_str(&startp, endp);
 627                         if (n < 0)
 628                                 return (-1);
 629                         ShrinkBuffer(INT16SZ);
 630                         PUTSHORT(n, cp);
 631                         /* key tag */
 632                         n = getnum_str(&startp, endp);
 633                         if (n < 0)
 634                                 return (-1);
 635                         ShrinkBuffer(INT16SZ);
 636                         PUTSHORT(n, cp);
 637                         /* alg */
 638                         n = getnum_str(&startp, endp);
 639                         if (n < 0)
 640                                 return (-1);
 641                         ShrinkBuffer(1);
 642                         *cp++ = n;
 643                         /* cert */
 644                         if ((n = getword_str(buf2, sizeof buf2,
 645                                              &startp, endp)) < 0)
 646                                 return (-1);
 647                         certlen = b64_pton(buf2, buf3, sizeof(buf3));
 648                         if (certlen < 0)
 649                                 return (-1);
 650                         ShrinkBuffer(certlen);
 651                         memcpy(cp, buf3, certlen);
 652                         cp += certlen;
 653                         break;
 654                 case ns_t_aaaa:
 655                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 656                                 return (-1);
 657                         if (inet_pton(AF_INET6, buf2, &in6a) <= 0)
 658                                 return (-1);
 659                         ShrinkBuffer(NS_IN6ADDRSZ);
 660                         memcpy(cp, &in6a, NS_IN6ADDRSZ);
 661                         cp += NS_IN6ADDRSZ;
 662                         break;
 663                 case ns_t_naptr:
 664                         /* Order Preference Flags Service Replacement Regexp */
 665                         /* Order */
 666                         n = getnum_str(&startp, endp);
 667                         if (n < 0 || n > 65535)
 668                                 return (-1);
 669                         ShrinkBuffer(INT16SZ);
 670                         PUTSHORT(n, cp);
 671                         /* Preference */
 672                         n = getnum_str(&startp, endp);
 673                         if (n < 0 || n > 65535)
 674                                 return (-1);
 675                         ShrinkBuffer(INT16SZ);
 676                         PUTSHORT(n, cp);
 677                         /* Flags */
 678                         if ((n = getstr_str(buf2, sizeof buf2,
 679                                         &startp, endp)) < 0) {
 680                                 return (-1);
 681                         }
 682                         if (n > 255)
 683                                 return (-1);
 684                         ShrinkBuffer(n+1);
 685                         *cp++ = n;
 686                         memcpy(cp, buf2, n);
 687                         cp += n;
 688                         /* Service Classes */
 689                         if ((n = getstr_str(buf2, sizeof buf2,
 690                                         &startp, endp)) < 0) {
 691                                 return (-1);
 692                         }
 693                         if (n > 255)
 694                                 return (-1);
 695                         ShrinkBuffer(n+1);
 696                         *cp++ = n;
 697                         memcpy(cp, buf2, n);
 698                         cp += n;
 699                         /* Pattern */
 700                         if ((n = getstr_str(buf2, sizeof buf2,
 701                                         &startp, endp)) < 0) {
 702                                 return (-1);
 703                         }
 704                         if (n > 255)
 705                                 return (-1);
 706                         ShrinkBuffer(n+1);
 707                         *cp++ = n;
 708                         memcpy(cp, buf2, n);
 709                         cp += n;
 710                         /* Replacement */
 711                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 712                                 return (-1);
 713                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 714                         if (n < 0)
 715                                 return (-1);
 716                         cp += n;
 717                         ShrinkBuffer(n);
 718                         break;
 719                 default:
 720                         return (-1);
 721                 } /*switch*/
 722                 n = (u_int16_t)((cp - sp2) - INT16SZ);
 723                 PUTSHORT(n, sp2);
 724         } /*for*/
 725
 726         hp->qdcount = htons(counts[0]);
 727         hp->ancount = htons(counts[1]);
 728         hp->nscount = htons(counts[2]);
 729         hp->arcount = htons(counts[3]);
 730         return (cp - buf);
 731 }
 732
 733 /*%
 734  * Get a whitespace delimited word from a string (not file)
 735  * into buf. modify the start pointer to point after the
 736  * word in the string.
 737  */
 738 static int
 739 getword_str(char *buf, int size, u_char **startpp, u_char *endp) {
 740         char *cp;
 741         int c;
 742
 743         for (cp = buf; *startpp <= endp; ) {
 744                 c = **startpp;
 745                 if (isspace(c) || c == '\0') {
 746                         if (cp != buf) /*%< trailing whitespace */
 747                                 break;
 748                         else { /*%< leading whitespace */
 749                                 (*startpp)++;
 750                                 continue;
 751                         }
 752                 }
 753                 (*startpp)++;
 754                 if (cp >= buf+size-1)
 755                         break;
 756                 *cp++ = (u_char)c;
 757         }
 758         *cp = '\0';
 759         return (cp != buf);
 760 }
 761
 762 /*%
 763  * get a white spae delimited string from memory.  Process quoted strings
 764  * and \\DDD escapes.  Return length or -1 on error.  Returned string may
 765  * contain nulls.
 766  */
 767 static char digits[] = "0123456789";
 768 static int
 769 getstr_str(char *buf, int size, u_char **startpp, u_char *endp) {
 770         char *cp;
 771         int c, c1 = 0;
 772         int inquote = 0;
 773         int seen_quote = 0;
 774         int escape = 0;
 775         int dig = 0;
 776
 777         for (cp = buf; *startpp <= endp; ) {
 778                 if ((c = **startpp) == '\0')
 779                         break;
 780                 /* leading white space */
 781                 if ((cp == buf) && !seen_quote && isspace(c)) {
 782                         (*startpp)++;
 783                         continue;
 784                 }
 785
 786                 switch (c) {
 787                 case '\\':
 788                         if (!escape)  {
 789                                 escape = 1;
 790                                 dig = 0;
 791                                 c1 = 0;
 792                                 (*startpp)++;
 793                                 continue;
 794                         }
 795                         goto do_escape;
 796                 case '"':
 797                         if (!escape) {
 798                                 inquote = !inquote;
 799                                 seen_quote = 1;
 800                                 (*startpp)++;
 801                                 continue;
 802                         }
 803                         /* fall through */
 804                 default:
 805                 do_escape:
 806                         if (escape) {
 807                                 switch (c) {
 808                                 case '0':
 809                                 case '1':
 810                                 case '2':
 811                                 case '3':
 812                                 case '4':
 813                                 case '5':
 814                                 case '6':
 815                                 case '7':
 816                                 case '8':
 817                                 case '9':
 818                                         c1 = c1 * 10 +
 819                                                 (strchr(digits, c) - digits);
 820
 821                                         if (++dig == 3) {
 822                                                 c = c1 &0xff;
 823                                                 break;
 824                                         }
 825                                         (*startpp)++;
 826                                         continue;
 827                                 }
 828                                 escape = 0;
 829                         } else if (!inquote && isspace(c))
 830                                 goto done;
 831                         if (cp >= buf+size-1)
 832                                 goto done;
 833                         *cp++ = (u_char)c;
 834                         (*startpp)++;
 835                 }
 836         }
 837  done:
 838         *cp = '\0';
 839         return ((cp == buf)?  (seen_quote? 0: -1): (cp - buf));
 840 }
 841
 842 /*%
 843  * Get a whitespace delimited base 16 number from a string (not file) into buf
 844  * update the start pointer to point after the number in the string.
 845  */
 846 static int
 847 gethexnum_str(u_char **startpp, u_char *endp) {
 848         int c, n;
 849         int seendigit = 0;
 850         int m = 0;
 851
 852         if (*startpp + 2 >= endp || strncasecmp((char *)*startpp, "0x", 2) != 0)
 853                 return getnum_str(startpp, endp);
 854         (*startpp)+=2;
 855         for (n = 0; *startpp <= endp; ) {
 856                 c = **startpp;
 857                 if (isspace(c) || c == '\0') {
 858                         if (seendigit) /*%< trailing whitespace */
 859                                 break;
 860                         else { /*%< leading whitespace */
 861                                 (*startpp)++;
 862                                 continue;
 863                         }
 864                 }
 865                 if (c == ';') {
 866                         while ((*startpp <= endp) &&
 867                                ((c = **startpp) != '\n'))
 868                                         (*startpp)++;
 869                         if (seendigit)
 870                                 break;
 871                         continue;
 872                 }
 873                 if (!isxdigit(c)) {
 874                         if (c == ')' && seendigit) {
 875                                 (*startpp)--;
 876                                 break;
 877                         }
 878                         return (-1);
 879                 }
 880                 (*startpp)++;
 881                 if (isdigit(c))
 882                         n = n * 16 + (c - '0');
 883                 else
 884                         n = n * 16 + (tolower(c) - 'a' + 10);
 885                 seendigit = 1;
 886         }
 887         return (n + m);
 888 }
 889
 890 /*%
 891  * Get a whitespace delimited base 10 number from a string (not file) into buf
 892  * update the start pointer to point after the number in the string.
 893  */
 894 static int
 895 getnum_str(u_char **startpp, u_char *endp) {
 896         int c, n;
 897         int seendigit = 0;
 898         int m = 0;
 899
 900         for (n = 0; *startpp <= endp; ) {
 901                 c = **startpp;
 902                 if (isspace(c) || c == '\0') {
 903                         if (seendigit) /*%< trailing whitespace */
 904                                 break;
 905                         else { /*%< leading whitespace */
 906                                 (*startpp)++;
 907                                 continue;
 908                         }
 909                 }
 910                 if (c == ';') {
 911                         while ((*startpp <= endp) &&
 912                                ((c = **startpp) != '\n'))
 913                                         (*startpp)++;
 914                         if (seendigit)
 915                                 break;
 916                         continue;
 917                 }
 918                 if (!isdigit(c)) {
 919                         if (c == ')' && seendigit) {
 920                                 (*startpp)--;
 921                                 break;
 922                         }
 923                         return (-1);
 924                 }
 925                 (*startpp)++;
 926                 n = n * 10 + (c - '0');
 927                 seendigit = 1;
 928         }
 929         return (n + m);
 930 }
 931
 932 /*%
 933  * Allocate a resource record buffer & save rr info.
 934  */
 935 ns_updrec *
 936 res_mkupdrec(int section, const char *dname,
 937              u_int class, u_int type, u_long ttl) {
 938         ns_updrec *rrecp = (ns_updrec *)calloc(1, sizeof(ns_updrec));
 939
 940         if (!rrecp || !(rrecp->r_dname = strdup(dname))) {
 941                 if (rrecp)
 942                         free((char *)rrecp);
 943                 return (NULL);
 944         }
 945         INIT_LINK(rrecp, r_link);
 946         INIT_LINK(rrecp, r_glink);
 947         rrecp->r_class = (ns_class)class;
 948         rrecp->r_type = (ns_type)type;
 949         rrecp->r_ttl = ttl;
 950         rrecp->r_section = (ns_sect)section;
 951         return (rrecp);
 952 }
 953
 954 /*%
 955  * Free a resource record buffer created by res_mkupdrec.
 956  */
 957 void
 958 res_freeupdrec(ns_updrec *rrecp) {
 959         /* Note: freeing r_dp is the caller's responsibility. */
 960         if (rrecp->r_dname != NULL)
 961                 free(rrecp->r_dname);
 962         free(rrecp);
 963 }
 964
 965 struct valuelist {
 966         struct valuelist *      next;
 967         struct valuelist *      prev;
 968         char *                  name;
 969         char *                  proto;
 970         int                     port;
 971 };
 972 static struct valuelist *servicelist, *protolist;
 973
 974 static void
 975 res_buildservicelist() {
 976         struct servent *sp;
 977         struct valuelist *slp;
 978
 979 #ifdef MAYBE_HESIOD
 980         setservent(0);
 981 #else
 982         setservent(1);
 983 #endif
 984         while ((sp = getservent()) != NULL) {
 985                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
 986                 if (!slp)
 987                         break;
 988                 slp->name = strdup(sp->s_name);
 989                 slp->proto = strdup(sp->s_proto);
 990                 if ((slp->name == NULL) || (slp->proto == NULL)) {
 991                         if (slp->name) free(slp->name);
 992                         if (slp->proto) free(slp->proto);
 993                         free(slp);
 994                         break;
 995                 }
 996                 slp->port = ntohs((u_int16_t)sp->s_port);  /*%< host byt order */
 997                 slp->next = servicelist;
 998                 slp->prev = NULL;
 999                 if (servicelist)
1000                         servicelist->prev = slp;
1001                 servicelist = slp;
1002         }
1003         endservent();
1004 }
1005
1006 #ifndef _LIBC
1007 void
1008 res_destroyservicelist() {
1009         struct valuelist *slp, *slp_next;
1010
1011         for (slp = servicelist; slp != NULL; slp = slp_next) {
1012                 slp_next = slp->next;
1013                 free(slp->name);
1014                 free(slp->proto);
1015                 free(slp);
1016         }
1017         servicelist = (struct valuelist *)0;
1018 }
1019 #endif
1020
1021 #ifdef _LIBC
1022 static
1023 #endif
1024 void
1025 res_buildprotolist(void) {
1026         struct protoent *pp;
1027         struct valuelist *slp;
1028
1029 #ifdef MAYBE_HESIOD
1030         setprotoent(0);
1031 #else
1032         setprotoent(1);
1033 #endif
1034         while ((pp = getprotoent()) != NULL) {
1035                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
1036                 if (!slp)
1037                         break;
1038                 slp->name = strdup(pp->p_name);
1039                 if (slp->name == NULL) {
1040                         free(slp);
1041                         break;
1042                 }
1043                 slp->port = pp->p_proto;        /*%< host byte order */
1044                 slp->next = protolist;
1045                 slp->prev = NULL;
1046                 if (protolist)
1047                         protolist->prev = slp;
1048                 protolist = slp;
1049         }
1050         endprotoent();
1051 }
1052
1053 #ifndef _LIBC
1054 void
1055 res_destroyprotolist(void) {
1056         struct valuelist *plp, *plp_next;
1057
1058         for (plp = protolist; plp != NULL; plp = plp_next) {
1059                 plp_next = plp->next;
1060                 free(plp->name);
1061                 free(plp);
1062         }
1063         protolist = (struct valuelist *)0;
1064 }
1065 #endif
1066
1067 static int
1068 findservice(const char *s, struct valuelist **list) {
1069         struct valuelist *lp = *list;
1070         int n;
1071
1072         for (; lp != NULL; lp = lp->next)
1073                 if (strcasecmp(lp->name, s) == 0) {
1074                         if (lp != *list) {
1075                                 lp->prev->next = lp->next;
1076                                 if (lp->next)
1077                                         lp->next->prev = lp->prev;
1078                                 (*list)->prev = lp;
1079                                 lp->next = *list;
1080                                 *list = lp;
1081                         }
1082                         return (lp->port);      /*%< host byte order */
1083                 }
1084         if (sscanf(s, "%d", &n) != 1 || n <= 0)
1085                 n = -1;
1086         return (n);
1087 }
1088
1089 /*%
1090  * Convert service name or (ascii) number to int.
1091  */
1092 #ifdef _LIBC
1093 static
1094 #endif
1095 int
1096 res_servicenumber(const char *p) {
1097         if (servicelist == (struct valuelist *)0)
1098                 res_buildservicelist();
1099         return (findservice(p, &servicelist));
1100 }
1101
1102 /*%
1103  * Convert protocol name or (ascii) number to int.
1104  */
1105 #ifdef _LIBC
1106 static
1107 #endif
1108 int
1109 res_protocolnumber(const char *p) {
1110         if (protolist == (struct valuelist *)0)
1111                 res_buildprotolist();
1112         return (findservice(p, &protolist));
1113 }
1114
1115 #ifndef _LIBC
1116 static struct servent *
1117 cgetservbyport(u_int16_t port, const char *proto) {     /*%< Host byte order. */
1118         struct valuelist **list = &servicelist;
1119         struct valuelist *lp = *list;
1120         static struct servent serv;
1121
1122         port = ntohs(port);
1123         for (; lp != NULL; lp = lp->next) {
1124                 if (port != (u_int16_t)lp->port)        /*%< Host byte order. */
1125                         continue;
1126                 if (strcasecmp(lp->proto, proto) == 0) {
1127                         if (lp != *list) {
1128                                 lp->prev->next = lp->next;
1129                                 if (lp->next)
1130                                         lp->next->prev = lp->prev;
1131                                 (*list)->prev = lp;
1132                                 lp->next = *list;
1133                                 *list = lp;
1134                         }
1135                         serv.s_name = lp->name;
1136                         serv.s_port = htons((u_int16_t)lp->port);
1137                         serv.s_proto = lp->proto;
1138                         return (&serv);
1139                 }
1140         }
1141         return (0);
1142 }
1143
1144 static struct protoent *
1145 cgetprotobynumber(int proto) {                          /*%< Host byte order. */
1146         struct valuelist **list = &protolist;
1147         struct valuelist *lp = *list;
1148         static struct protoent prot;
1149
1150         for (; lp != NULL; lp = lp->next)
1151                 if (lp->port == proto) {                /*%< Host byte order. */
1152                         if (lp != *list) {
1153                                 lp->prev->next = lp->next;
1154                                 if (lp->next)
1155                                         lp->next->prev = lp->prev;
1156                                 (*list)->prev = lp;
1157                                 lp->next = *list;
1158                                 *list = lp;
1159                         }
1160                         prot.p_name = lp->name;
1161                         prot.p_proto = lp->port;        /*%< Host byte order. */
1162                         return (&prot);
1163                 }
1164         return (0);
1165 }
1166
1167 const char *
1168 res_protocolname(int num) {
1169         static char number[8];
1170         struct protoent *pp;
1171
1172         if (protolist == (struct valuelist *)0)
1173                 res_buildprotolist();
1174         pp = cgetprotobynumber(num);
1175         if (pp == 0)  {
1176                 (void) sprintf(number, "%d", num);
1177                 return (number);
1178         }
1179         return (pp->p_name);
1180 }
1181
1182 const char *
1183 res_servicename(u_int16_t port, const char *proto) {    /*%< Host byte order. */
1184         static char number[8];
1185         struct servent *ss;
1186
1187         if (servicelist == (struct valuelist *)0)
1188                 res_buildservicelist();
1189         ss = cgetservbyport(htons(port), proto);
1190         if (ss == 0)  {
1191                 (void) sprintf(number, "%d", port);
1192                 return (number);
1193         }
1194         return (ss->s_name);
1195 }
1196 #endif