usr/src/lib/libresolv2/common/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 #include "port_before.h"
  25
  26 #include <sys/types.h>
  27 #include <sys/param.h>
  28
  29 #include <netinet/in.h>
  30 #include <arpa/nameser.h>
  31 #include <arpa/inet.h>
  32
  33 #include <errno.h>
  34 #include <limits.h>
  35 #include <netdb.h>
  36 #include <resolv.h>
  37 #include <res_update.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42 #include <ctype.h>
  43
  44 #include "port_after.h"
  45
  46 /* Options.  Leave them on. */
  47 #define DEBUG
  48 #define MAXPORT 1024
  49
  50 static int getnum_str(u_char **, u_char *);
  51 static int gethexnum_str(u_char **, u_char *);
  52 static int getword_str(char *, int, u_char **, u_char *);
  53 static int getstr_str(char *, int, u_char **, u_char *);
  54
  55 #define ShrinkBuffer(x)  if ((buflen -= x) < 0) return (-2);
  56
  57 /* Forward. */
  58
  59 int res_protocolnumber(const char *);
  60 int res_servicenumber(const char *);
  61
  62 /*%
  63  * Form update packets.
  64  * Returns the size of the resulting packet if no error
  65  *
  66  * On error,
  67  *      returns
  68  *\li              -1 if error in reading a word/number in rdata
  69  *                 portion for update packets
  70  *\li           -2 if length of buffer passed is insufficient
  71  *\li           -3 if zone section is not the first section in
  72  *                 the linked list, or section order has a problem
  73  *\li           -4 on a number overflow
  74  *\li           -5 unknown operation or no records
  75  */
  76 int
  77 res_nmkupdate(res_state statp, ns_updrec *rrecp_in, u_char *buf, int buflen) {
  78         ns_updrec *rrecp_start = rrecp_in;
  79         HEADER *hp;
  80         u_char *cp, *sp2, *startp, *endp;
  81         int n, i, soanum, multiline;
  82         ns_updrec *rrecp;
  83         struct in_addr ina;
  84         struct in6_addr in6a;
  85         char buf2[MAXDNAME];
  86         u_char buf3[MAXDNAME];
  87         int section, numrrs = 0, counts[ns_s_max];
  88         u_int16_t rtype, rclass;
  89         u_int32_t n1, rttl;
  90         u_char *dnptrs[20], **dpp, **lastdnptr;
  91         int siglen, keylen, certlen;
  92
  93         /*
  94          * Initialize header fields.
  95          */
  96         if ((buf == NULL) || (buflen < HFIXEDSZ))
  97                 return (-1);
  98         memset(buf, 0, HFIXEDSZ);
  99         hp = (HEADER *) buf;
 100         statp->id = res_nrandomid(statp);
 101         hp->id = htons(statp->id);
 102         hp->opcode = ns_o_update;
 103         hp->rcode = NOERROR;
 104         cp = buf + HFIXEDSZ;
 105         buflen -= HFIXEDSZ;
 106         dpp = dnptrs;
 107         *dpp++ = buf;
 108         *dpp++ = NULL;
 109         lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
 110
 111         if (rrecp_start == NULL)
 112                 return (-5);
 113         else if (rrecp_start->r_section != S_ZONE)
 114                 return (-3);
 115
 116         memset(counts, 0, sizeof counts);
 117         for (rrecp = rrecp_start; rrecp; rrecp = NEXT(rrecp, r_glink)) {
 118                 numrrs++;
 119                 section = rrecp->r_section;
 120                 if (section < 0 || section >= ns_s_max)
 121                         return (-1);
 122                 counts[section]++;
 123                 for (i = section + 1; i < ns_s_max; i++)
 124                         if (counts[i])
 125                                 return (-3);
 126                 rtype = rrecp->r_type;
 127                 rclass = rrecp->r_class;
 128                 rttl = rrecp->r_ttl;
 129                 /* overload class and type */
 130                 if (section == S_PREREQ) {
 131                         rttl = 0;
 132                         switch (rrecp->r_opcode) {
 133                         case YXDOMAIN:
 134                                 rclass = C_ANY;
 135                                 rtype = T_ANY;
 136                                 rrecp->r_size = 0;
 137                                 break;
 138                         case NXDOMAIN:
 139                                 rclass = C_NONE;
 140                                 rtype = T_ANY;
 141                                 rrecp->r_size = 0;
 142                                 break;
 143                         case NXRRSET:
 144                                 rclass = C_NONE;
 145                                 rrecp->r_size = 0;
 146                                 break;
 147                         case YXRRSET:
 148                                 if (rrecp->r_size == 0)
 149                                         rclass = C_ANY;
 150                                 break;
 151                         default:
 152                                 fprintf(stderr,
 153                                         "res_mkupdate: incorrect opcode: %d\n",
 154                                         rrecp->r_opcode);
 155                                 fflush(stderr);
 156                                 return (-1);
 157                         }
 158                 } else if (section == S_UPDATE) {
 159                         switch (rrecp->r_opcode) {
 160                         case DELETE:
 161                                 rclass = rrecp->r_size == 0 ? C_ANY : C_NONE;
 162                                 break;
 163                         case ADD:
 164                                 break;
 165                         default:
 166                                 fprintf(stderr,
 167                                         "res_mkupdate: incorrect opcode: %d\n",
 168                                         rrecp->r_opcode);
 169                                 fflush(stderr);
 170                                 return (-1);
 171                         }
 172                 }
 173
 174                 /*
 175                  * XXX  appending default domain to owner name is omitted,
 176                  *      fqdn must be provided
 177                  */
 178                 if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs,
 179                                  lastdnptr)) < 0)
 180                         return (-1);
 181                 cp += n;
 182                 ShrinkBuffer(n + 2*INT16SZ);
 183                 PUTSHORT(rtype, cp);
 184                 PUTSHORT(rclass, cp);
 185                 if (section == S_ZONE) {
 186                         if (numrrs != 1 || rrecp->r_type != T_SOA)
 187                                 return (-3);
 188                         continue;
 189                 }
 190                 ShrinkBuffer(INT32SZ + INT16SZ);
 191                 PUTLONG(rttl, cp);
 192                 sp2 = cp;  /*%< save pointer to length byte */
 193                 cp += INT16SZ;
 194                 if (rrecp->r_size == 0) {
 195                         if (section == S_UPDATE && rclass != C_ANY)
 196                                 return (-1);
 197                         else {
 198                                 PUTSHORT(0, sp2);
 199                                 continue;
 200                         }
 201                 }
 202                 startp = rrecp->r_data;
 203                 endp = startp + rrecp->r_size - 1;
 204                 /* XXX this should be done centrally. */
 205                 switch (rrecp->r_type) {
 206                 case T_A:
 207                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 208                                 return (-1);
 209                         if (!inet_aton(buf2, &ina))
 210                                 return (-1);
 211                         n1 = ntohl(ina.s_addr);
 212                         ShrinkBuffer(INT32SZ);
 213                         PUTLONG(n1, cp);
 214                         break;
 215                 case T_CNAME:
 216                 case T_MB:
 217                 case T_MG:
 218                 case T_MR:
 219                 case T_NS:
 220                 case T_PTR:
 221                 case ns_t_dname:
 222                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 223                                 return (-1);
 224                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 225                         if (n < 0)
 226                                 return (-1);
 227                         cp += n;
 228                         ShrinkBuffer(n);
 229                         break;
 230                 case T_MINFO:
 231                 case T_SOA:
 232                 case T_RP:
 233                         for (i = 0; i < 2; i++) {
 234                                 if (!getword_str(buf2, sizeof buf2, &startp,
 235                                                  endp))
 236                                 return (-1);
 237                                 n = dn_comp(buf2, cp, buflen,
 238                                             dnptrs, lastdnptr);
 239                                 if (n < 0)
 240                                         return (-1);
 241                                 cp += n;
 242                                 ShrinkBuffer(n);
 243                         }
 244                         if (rrecp->r_type == T_SOA) {
 245                                 ShrinkBuffer(5 * INT32SZ);
 246                                 while (isspace(*startp) || !*startp)
 247                                         startp++;
 248                                 if (*startp == '(') {
 249                                         multiline = 1;
 250                                         startp++;
 251                                 } else
 252                                         multiline = 0;
 253                                 /* serial, refresh, retry, expire, minimum */
 254                                 for (i = 0; i < 5; i++) {
 255                                         soanum = getnum_str(&startp, endp);
 256                                         if (soanum < 0)
 257                                                 return (-1);
 258                                         PUTLONG(soanum, cp);
 259                                 }
 260                                 if (multiline) {
 261                                         while (isspace(*startp) || !*startp)
 262                                                 startp++;
 263                                         if (*startp != ')')
 264                                                 return (-1);
 265                                 }
 266                         }
 267                         break;
 268                 case T_MX:
 269                 case T_AFSDB:
 270                 case T_RT:
 271                         n = getnum_str(&startp, endp);
 272                         if (n < 0)
 273                                 return (-1);
 274                         ShrinkBuffer(INT16SZ);
 275                         PUTSHORT(n, cp);
 276                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 277                                 return (-1);
 278                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 279                         if (n < 0)
 280                                 return (-1);
 281                         cp += n;
 282                         ShrinkBuffer(n);
 283                         break;
 284                 case T_SRV:
 285                         n = getnum_str(&startp, endp);
 286                         if (n < 0)
 287                                 return (-1);
 288                         ShrinkBuffer(INT16SZ);
 289                         PUTSHORT(n, cp);
 290
 291                         n = getnum_str(&startp, endp);
 292                         if (n < 0)
 293                                 return (-1);
 294                         ShrinkBuffer(INT16SZ);
 295                         PUTSHORT(n, cp);
 296
 297                         n = getnum_str(&startp, endp);
 298                         if (n < 0)
 299                                 return (-1);
 300                         ShrinkBuffer(INT16SZ);
 301                         PUTSHORT(n, cp);
 302
 303                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 304                                 return (-1);
 305                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 306                         if (n < 0)
 307                                 return (-1);
 308                         cp += n;
 309                         ShrinkBuffer(n);
 310                         break;
 311                 case T_PX:
 312                         n = getnum_str(&startp, endp);
 313                         if (n < 0)
 314                                 return (-1);
 315                         PUTSHORT(n, cp);
 316                         ShrinkBuffer(INT16SZ);
 317                         for (i = 0; i < 2; i++) {
 318                                 if (!getword_str(buf2, sizeof buf2, &startp,
 319                                                  endp))
 320                                         return (-1);
 321                                 n = dn_comp(buf2, cp, buflen, dnptrs,
 322                                             lastdnptr);
 323                                 if (n < 0)
 324                                         return (-1);
 325                                 cp += n;
 326                                 ShrinkBuffer(n);
 327                         }
 328                         break;
 329                 case T_WKS: {
 330                         char bm[MAXPORT/8];
 331                         unsigned int maxbm = 0;
 332
 333                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 334                                 return (-1);
 335                         if (!inet_aton(buf2, &ina))
 336                                 return (-1);
 337                         n1 = ntohl(ina.s_addr);
 338                         ShrinkBuffer(INT32SZ);
 339                         PUTLONG(n1, cp);
 340
 341                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 342                                 return (-1);
 343                         if ((i = res_protocolnumber(buf2)) < 0)
 344                                 return (-1);
 345                         ShrinkBuffer(1);
 346                         *cp++ = i & 0xff;
 347
 348                         for (i = 0; i < MAXPORT/8 ; i++)
 349                                 bm[i] = 0;
 350
 351                         while (getword_str(buf2, sizeof buf2, &startp, endp)) {
 352                                 if ((n = res_servicenumber(buf2)) <= 0)
 353                                         return (-1);
 354
 355                                 if (n < MAXPORT) {
 356                                         bm[n/8] |= (0x80>>(n%8));
 357                                         if ((unsigned)n > maxbm)
 358                                                 maxbm = n;
 359                                 } else
 360                                         return (-1);
 361                         }
 362                         maxbm = maxbm/8 + 1;
 363                         ShrinkBuffer(maxbm);
 364                         memcpy(cp, bm, maxbm);
 365                         cp += maxbm;
 366                         break;
 367                 }
 368                 case T_HINFO:
 369                         for (i = 0; i < 2; i++) {
 370                                 if ((n = getstr_str(buf2, sizeof buf2,
 371                                                 &startp, endp)) < 0)
 372                                         return (-1);
 373                                 if (n > 255)
 374                                         return (-1);
 375                                 ShrinkBuffer(n+1);
 376                                 *cp++ = n;
 377                                 memcpy(cp, buf2, n);
 378                                 cp += n;
 379                         }
 380                         break;
 381                 case T_TXT:
 382                         for (;;) {
 383                                 if ((n = getstr_str(buf2, sizeof buf2,
 384                                                 &startp, endp)) < 0) {
 385                                         if (cp != (sp2 + INT16SZ))
 386                                                 break;
 387                                         return (-1);
 388                                 }
 389                                 if (n > 255)
 390                                         return (-1);
 391                                 ShrinkBuffer(n+1);
 392                                 *cp++ = n;
 393                                 memcpy(cp, buf2, n);
 394                                 cp += n;
 395                         }
 396                         break;
 397                 case T_X25:
 398                         /* RFC1183 */
 399                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 400                                          endp)) < 0)
 401                                 return (-1);
 402                         if (n > 255)
 403                                 return (-1);
 404                         ShrinkBuffer(n+1);
 405                         *cp++ = n;
 406                         memcpy(cp, buf2, n);
 407                         cp += n;
 408                         break;
 409                 case T_ISDN:
 410                         /* RFC1183 */
 411                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 412                                          endp)) < 0)
 413                                 return (-1);
 414                         if ((n > 255) || (n == 0))
 415                                 return (-1);
 416                         ShrinkBuffer(n+1);
 417                         *cp++ = n;
 418                         memcpy(cp, buf2, n);
 419                         cp += n;
 420                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 421                                          endp)) < 0)
 422                                 n = 0;
 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_NSAP:
 431                         if ((n = inet_nsap_addr((char *)startp, (u_char *)buf2, sizeof(buf2))) != 0) {
 432                                 ShrinkBuffer(n);
 433                                 memcpy(cp, buf2, n);
 434                                 cp += n;
 435                         } else {
 436                                 return (-1);
 437                         }
 438                         break;
 439                 case T_LOC:
 440                         if ((n = loc_aton((char *)startp, (u_char *)buf2)) != 0) {
 441                                 ShrinkBuffer(n);
 442                                 memcpy(cp, buf2, n);
 443                                 cp += n;
 444                         } else
 445                                 return (-1);
 446                         break;
 447                 case ns_t_sig:
 448                     {
 449                         int sig_type, success, dateerror;
 450                         u_int32_t exptime, timesigned;
 451
 452                         /* type */
 453                         if ((n = getword_str(buf2, sizeof buf2,
 454                                              &startp, endp)) < 0)
 455                                 return (-1);
 456                         sig_type = sym_ston(__p_type_syms, buf2, &success);
 457                         if (!success || sig_type == ns_t_any)
 458                                 return (-1);
 459                         ShrinkBuffer(INT16SZ);
 460                         PUTSHORT(sig_type, cp);
 461                         /* alg */
 462                         n = getnum_str(&startp, endp);
 463                         if (n < 0)
 464                                 return (-1);
 465                         ShrinkBuffer(1);
 466                         *cp++ = n;
 467                         /* labels */
 468                         n = getnum_str(&startp, endp);
 469                         if (n <= 0 || n > 255)
 470                                 return (-1);
 471                         ShrinkBuffer(1);
 472                         *cp++ = n;
 473                         /* ottl  & expire */
 474                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 475                                 return (-1);
 476                         exptime = ns_datetosecs(buf2, &dateerror);
 477                         if (!dateerror) {
 478                                 ShrinkBuffer(INT32SZ);
 479                                 PUTLONG(rttl, cp);
 480                         }
 481                         else {
 482                                 char *ulendp;
 483                                 u_int32_t ottl;
 484
 485                                 errno = 0;
 486                                 ottl = strtoul(buf2, &ulendp, 10);
 487                                 if (errno != 0 ||
 488                                     (ulendp != NULL && *ulendp != '\0'))
 489                                         return (-1);
 490                                 ShrinkBuffer(INT32SZ);
 491                                 PUTLONG(ottl, cp);
 492                                 if (!getword_str(buf2, sizeof buf2, &startp,
 493                                                  endp))
 494                                         return (-1);
 495                                 exptime = ns_datetosecs(buf2, &dateerror);
 496                                 if (dateerror)
 497                                         return (-1);
 498                         }
 499                         /* expire */
 500                         ShrinkBuffer(INT32SZ);
 501                         PUTLONG(exptime, cp);
 502                         /* timesigned */
 503                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 504                                 return (-1);
 505                         timesigned = ns_datetosecs(buf2, &dateerror);
 506                         if (!dateerror) {
 507                                 ShrinkBuffer(INT32SZ);
 508                                 PUTLONG(timesigned, cp);
 509                         }
 510                         else
 511                                 return (-1);
 512                         /* footprint */
 513                         n = getnum_str(&startp, endp);
 514                         if (n < 0)
 515                                 return (-1);
 516                         ShrinkBuffer(INT16SZ);
 517                         PUTSHORT(n, cp);
 518                         /* signer name */
 519                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 520                                 return (-1);
 521                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 522                         if (n < 0)
 523                                 return (-1);
 524                         cp += n;
 525                         ShrinkBuffer(n);
 526                         /* sig */
 527                         if ((n = getword_str(buf2, sizeof buf2,
 528                                              &startp, endp)) < 0)
 529                                 return (-1);
 530                         siglen = b64_pton(buf2, buf3, sizeof(buf3));
 531                         if (siglen < 0)
 532                                 return (-1);
 533                         ShrinkBuffer(siglen);
 534                         memcpy(cp, buf3, siglen);
 535                         cp += siglen;
 536                         break;
 537                     }
 538                 case ns_t_key:
 539                         /* flags */
 540                         n = gethexnum_str(&startp, endp);
 541                         if (n < 0)
 542                                 return (-1);
 543                         ShrinkBuffer(INT16SZ);
 544                         PUTSHORT(n, cp);
 545                         /* proto */
 546                         n = getnum_str(&startp, endp);
 547                         if (n < 0)
 548                                 return (-1);
 549                         ShrinkBuffer(1);
 550                         *cp++ = n;
 551                         /* alg */
 552                         n = getnum_str(&startp, endp);
 553                         if (n < 0)
 554                                 return (-1);
 555                         ShrinkBuffer(1);
 556                         *cp++ = n;
 557                         /* key */
 558                         if ((n = getword_str(buf2, sizeof buf2,
 559                                              &startp, endp)) < 0)
 560                                 return (-1);
 561                         keylen = b64_pton(buf2, buf3, sizeof(buf3));
 562                         if (keylen < 0)
 563                                 return (-1);
 564                         ShrinkBuffer(keylen);
 565                         memcpy(cp, buf3, keylen);
 566                         cp += keylen;
 567                         break;
 568                 case ns_t_nxt:
 569                     {
 570                         int success, nxt_type;
 571                         u_char data[32];
 572                         int maxtype;
 573
 574                         /* next name */
 575                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 576                                 return (-1);
 577                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 578                         if (n < 0)
 579                                 return (-1);
 580                         cp += n;
 581                         ShrinkBuffer(n);
 582                         maxtype = 0;
 583                         memset(data, 0, sizeof data);
 584                         for (;;) {
 585                                 if (!getword_str(buf2, sizeof buf2, &startp,
 586                                                  endp))
 587                                         break;
 588                                 nxt_type = sym_ston(__p_type_syms, buf2,
 589                                                     &success);
 590                                 if (!success || !ns_t_rr_p(nxt_type))
 591                                         return (-1);
 592                                 NS_NXT_BIT_SET(nxt_type, data);
 593                                 if (nxt_type > maxtype)
 594                                         maxtype = nxt_type;
 595                         }
 596                         n = maxtype/NS_NXT_BITS+1;
 597                         ShrinkBuffer(n);
 598                         memcpy(cp, data, n);
 599                         cp += n;
 600                         break;
 601                     }
 602                 case ns_t_cert:
 603                         /* type */
 604                         n = getnum_str(&startp, endp);
 605                         if (n < 0)
 606                                 return (-1);
 607                         ShrinkBuffer(INT16SZ);
 608                         PUTSHORT(n, cp);
 609                         /* key tag */
 610                         n = getnum_str(&startp, endp);
 611                         if (n < 0)
 612                                 return (-1);
 613                         ShrinkBuffer(INT16SZ);
 614                         PUTSHORT(n, cp);
 615                         /* alg */
 616                         n = getnum_str(&startp, endp);
 617                         if (n < 0)
 618                                 return (-1);
 619                         ShrinkBuffer(1);
 620                         *cp++ = n;
 621                         /* cert */
 622                         if ((n = getword_str(buf2, sizeof buf2,
 623                                              &startp, endp)) < 0)
 624                                 return (-1);
 625                         certlen = b64_pton(buf2, buf3, sizeof(buf3));
 626                         if (certlen < 0)
 627                                 return (-1);
 628                         ShrinkBuffer(certlen);
 629                         memcpy(cp, buf3, certlen);
 630                         cp += certlen;
 631                         break;
 632                 case ns_t_aaaa:
 633                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 634                                 return (-1);
 635                         if (inet_pton(AF_INET6, buf2, &in6a) <= 0)
 636                                 return (-1);
 637                         ShrinkBuffer(NS_IN6ADDRSZ);
 638                         memcpy(cp, &in6a, NS_IN6ADDRSZ);
 639                         cp += NS_IN6ADDRSZ;
 640                         break;
 641                 case ns_t_naptr:
 642                         /* Order Preference Flags Service Replacement Regexp */
 643                         /* Order */
 644                         n = getnum_str(&startp, endp);
 645                         if (n < 0 || n > 65535)
 646                                 return (-1);
 647                         ShrinkBuffer(INT16SZ);
 648                         PUTSHORT(n, cp);
 649                         /* Preference */
 650                         n = getnum_str(&startp, endp);
 651                         if (n < 0 || n > 65535)
 652                                 return (-1);
 653                         ShrinkBuffer(INT16SZ);
 654                         PUTSHORT(n, cp);
 655                         /* Flags */
 656                         if ((n = getstr_str(buf2, sizeof buf2,
 657                                         &startp, endp)) < 0) {
 658                                 return (-1);
 659                         }
 660                         if (n > 255)
 661                                 return (-1);
 662                         ShrinkBuffer(n+1);
 663                         *cp++ = n;
 664                         memcpy(cp, buf2, n);
 665                         cp += n;
 666                         /* Service Classes */
 667                         if ((n = getstr_str(buf2, sizeof buf2,
 668                                         &startp, endp)) < 0) {
 669                                 return (-1);
 670                         }
 671                         if (n > 255)
 672                                 return (-1);
 673                         ShrinkBuffer(n+1);
 674                         *cp++ = n;
 675                         memcpy(cp, buf2, n);
 676                         cp += n;
 677                         /* Pattern */
 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                         /* Replacement */
 689                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 690                                 return (-1);
 691                         n = dn_comp(buf2, cp, buflen, NULL, NULL);
 692                         if (n < 0)
 693                                 return (-1);
 694                         cp += n;
 695                         ShrinkBuffer(n);
 696                         break;
 697                 default:
 698                         return (-1);
 699                 } /*switch*/
 700                 n = (u_int16_t)((cp - sp2) - INT16SZ);
 701                 PUTSHORT(n, sp2);
 702         } /*for*/
 703
 704         hp->qdcount = htons(counts[0]);
 705         hp->ancount = htons(counts[1]);
 706         hp->nscount = htons(counts[2]);
 707         hp->arcount = htons(counts[3]);
 708         return (cp - buf);
 709 }
 710
 711 /*%
 712  * Get a whitespace delimited word from a string (not file)
 713  * into buf. modify the start pointer to point after the
 714  * word in the string.
 715  */
 716 static int
 717 getword_str(char *buf, int size, u_char **startpp, u_char *endp) {
 718         char *cp;
 719         int c;
 720
 721         for (cp = buf; *startpp <= endp; ) {
 722                 c = **startpp;
 723                 if (isspace(c) || c == '\0') {
 724                         if (cp != buf) /*%< trailing whitespace */
 725                                 break;
 726                         else { /*%< leading whitespace */
 727                                 (*startpp)++;
 728                                 continue;
 729                         }
 730                 }
 731                 (*startpp)++;
 732                 if (cp >= buf+size-1)
 733                         break;
 734                 *cp++ = (u_char)c;
 735         }
 736         *cp = '\0';
 737         return (cp != buf);
 738 }
 739
 740 /*%
 741  * get a white spae delimited string from memory.  Process quoted strings
 742  * and \\DDD escapes.  Return length or -1 on error.  Returned string may
 743  * contain nulls.
 744  */
 745 static char digits[] = "0123456789";
 746 static int
 747 getstr_str(char *buf, int size, u_char **startpp, u_char *endp) {
 748         char *cp;
 749         int c, c1 = 0;
 750         int inquote = 0;
 751         int seen_quote = 0;
 752         int escape = 0;
 753         int dig = 0;
 754
 755         for (cp = buf; *startpp <= endp; ) {
 756                 if ((c = **startpp) == '\0')
 757                         break;
 758                 /* leading white space */
 759                 if ((cp == buf) && !seen_quote && isspace(c)) {
 760                         (*startpp)++;
 761                         continue;
 762                 }
 763
 764                 switch (c) {
 765                 case '\\':
 766                         if (!escape)  {
 767                                 escape = 1;
 768                                 dig = 0;
 769                                 c1 = 0;
 770                                 (*startpp)++;
 771                                 continue;
 772                         }
 773                         goto do_escape;
 774                 case '"':
 775                         if (!escape) {
 776                                 inquote = !inquote;
 777                                 seen_quote = 1;
 778                                 (*startpp)++;
 779                                 continue;
 780                         }
 781                         /* fall through */
 782                 default:
 783                 do_escape:
 784                         if (escape) {
 785                                 switch (c) {
 786                                 case '0':
 787                                 case '1':
 788                                 case '2':
 789                                 case '3':
 790                                 case '4':
 791                                 case '5':
 792                                 case '6':
 793                                 case '7':
 794                                 case '8':
 795                                 case '9':
 796                                         c1 = c1 * 10 +
 797                                                 (strchr(digits, c) - digits);
 798
 799                                         if (++dig == 3) {
 800                                                 c = c1 &0xff;
 801                                                 break;
 802                                         }
 803                                         (*startpp)++;
 804                                         continue;
 805                                 }
 806                                 escape = 0;
 807                         } else if (!inquote && isspace(c))
 808                                 goto done;
 809                         if (cp >= buf+size-1)
 810                                 goto done;
 811                         *cp++ = (u_char)c;
 812                         (*startpp)++;
 813                 }
 814         }
 815  done:
 816         *cp = '\0';
 817         return ((cp == buf)?  (seen_quote? 0: -1): (cp - buf));
 818 }
 819
 820 /*%
 821  * Get a whitespace delimited base 16 number from a string (not file) into buf
 822  * update the start pointer to point after the number in the string.
 823  */
 824 static int
 825 gethexnum_str(u_char **startpp, u_char *endp) {
 826         int c, n;
 827         int seendigit = 0;
 828         int m = 0;
 829
 830         if (*startpp + 2 >= endp || strncasecmp((char *)*startpp, "0x", 2) != 0)
 831                 return getnum_str(startpp, endp);
 832         (*startpp)+=2;
 833         for (n = 0; *startpp <= endp; ) {
 834                 c = **startpp;
 835                 if (isspace(c) || c == '\0') {
 836                         if (seendigit) /*%< trailing whitespace */
 837                                 break;
 838                         else { /*%< leading whitespace */
 839                                 (*startpp)++;
 840                                 continue;
 841                         }
 842                 }
 843                 if (c == ';') {
 844                         while ((*startpp <= endp) &&
 845                                ((c = **startpp) != '\n'))
 846                                         (*startpp)++;
 847                         if (seendigit)
 848                                 break;
 849                         continue;
 850                 }
 851                 if (!isxdigit(c)) {
 852                         if (c == ')' && seendigit) {
 853                                 (*startpp)--;
 854                                 break;
 855                         }
 856                         return (-1);
 857                 }
 858                 (*startpp)++;
 859                 if (isdigit(c))
 860                         n = n * 16 + (c - '0');
 861                 else
 862                         n = n * 16 + (tolower(c) - 'a' + 10);
 863                 seendigit = 1;
 864         }
 865         return (n + m);
 866 }
 867
 868 /*%
 869  * Get a whitespace delimited base 10 number from a string (not file) into buf
 870  * update the start pointer to point after the number in the string.
 871  */
 872 static int
 873 getnum_str(u_char **startpp, u_char *endp) {
 874         int c, n;
 875         int seendigit = 0;
 876         int m = 0;
 877
 878         for (n = 0; *startpp <= endp; ) {
 879                 c = **startpp;
 880                 if (isspace(c) || c == '\0') {
 881                         if (seendigit) /*%< trailing whitespace */
 882                                 break;
 883                         else { /*%< leading whitespace */
 884                                 (*startpp)++;
 885                                 continue;
 886                         }
 887                 }
 888                 if (c == ';') {
 889                         while ((*startpp <= endp) &&
 890                                ((c = **startpp) != '\n'))
 891                                         (*startpp)++;
 892                         if (seendigit)
 893                                 break;
 894                         continue;
 895                 }
 896                 if (!isdigit(c)) {
 897                         if (c == ')' && seendigit) {
 898                                 (*startpp)--;
 899                                 break;
 900                         }
 901                         return (-1);
 902                 }
 903                 (*startpp)++;
 904                 n = n * 10 + (c - '0');
 905                 seendigit = 1;
 906         }
 907         return (n + m);
 908 }
 909
 910 /*%
 911  * Allocate a resource record buffer & save rr info.
 912  */
 913 ns_updrec *
 914 res_mkupdrec(int section, const char *dname,
 915              u_int class, u_int type, u_long ttl) {
 916         ns_updrec *rrecp = (ns_updrec *)calloc(1, sizeof(ns_updrec));
 917
 918         if (!rrecp || !(rrecp->r_dname = strdup(dname))) {
 919                 if (rrecp)
 920                         free((char *)rrecp);
 921                 return (NULL);
 922         }
 923         INIT_LINK(rrecp, r_link);
 924         INIT_LINK(rrecp, r_glink);
 925         rrecp->r_class = (ns_class)class;
 926         rrecp->r_type = (ns_type)type;
 927         rrecp->r_ttl = ttl;
 928         rrecp->r_section = (ns_sect)section;
 929         return (rrecp);
 930 }
 931
 932 /*%
 933  * Free a resource record buffer created by res_mkupdrec.
 934  */
 935 void
 936 res_freeupdrec(ns_updrec *rrecp) {
 937         /* Note: freeing r_dp is the caller's responsibility. */
 938         free(rrecp->r_dname);
 939         free(rrecp);
 940 }
 941
 942 struct valuelist {
 943         struct valuelist *      next;
 944         struct valuelist *      prev;
 945         char *                  name;
 946         char *                  proto;
 947         int                     port;
 948 };
 949 static struct valuelist *servicelist, *protolist;
 950
 951 static void
 952 res_buildservicelist() {
 953         struct servent *sp;
 954         struct valuelist *slp;
 955
 956 #ifdef MAYBE_HESIOD
 957         setservent(0);
 958 #else
 959         setservent(1);
 960 #endif
 961         while ((sp = getservent()) != NULL) {
 962                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
 963                 if (!slp)
 964                         break;
 965                 slp->name = strdup(sp->s_name);
 966                 slp->proto = strdup(sp->s_proto);
 967                 if ((slp->name == NULL) || (slp->proto == NULL)) {
 968                         free(slp->name);
 969                         free(slp->proto);
 970                         free(slp);
 971                         break;
 972                 }
 973                 slp->port = ntohs((u_int16_t)sp->s_port);  /*%< host byt order */
 974                 slp->next = servicelist;
 975                 slp->prev = NULL;
 976                 if (servicelist)
 977                         servicelist->prev = slp;
 978                 servicelist = slp;
 979         }
 980         endservent();
 981 }
 982
 983 void
 984 res_destroyservicelist() {
 985         struct valuelist *slp, *slp_next;
 986
 987         for (slp = servicelist; slp != NULL; slp = slp_next) {
 988                 slp_next = slp->next;
 989                 free(slp->name);
 990                 free(slp->proto);
 991                 free(slp);
 992         }
 993         servicelist = NULL;
 994 }
 995
 996 void
 997 res_buildprotolist(void) {
 998         struct protoent *pp;
 999         struct valuelist *slp;
1000
1001 #ifdef MAYBE_HESIOD
1002         setprotoent(0);
1003 #else
1004         setprotoent(1);
1005 #endif
1006         while ((pp = getprotoent()) != NULL) {
1007                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
1008                 if (!slp)
1009                         break;
1010                 slp->name = strdup(pp->p_name);
1011                 if (slp->name == NULL) {
1012                         free(slp);
1013                         break;
1014                 }
1015                 slp->port = pp->p_proto;        /*%< host byte order */
1016                 slp->next = protolist;
1017                 slp->prev = NULL;
1018                 if (protolist)
1019                         protolist->prev = slp;
1020                 protolist = slp;
1021         }
1022         endprotoent();
1023 }
1024
1025 void
1026 res_destroyprotolist(void) {
1027         struct valuelist *plp, *plp_next;
1028
1029         for (plp = protolist; plp != NULL; plp = plp_next) {
1030                 plp_next = plp->next;
1031                 free(plp->name);
1032                 free(plp);
1033         }
1034         protolist = NULL;
1035 }
1036
1037 static int
1038 findservice(const char *s, struct valuelist **list) {
1039         struct valuelist *lp = *list;
1040         int n;
1041
1042         for (; lp != NULL; lp = lp->next)
1043                 if (strcasecmp(lp->name, s) == 0) {
1044                         if (lp != *list) {
1045                                 lp->prev->next = lp->next;
1046                                 if (lp->next)
1047                                         lp->next->prev = lp->prev;
1048                                 (*list)->prev = lp;
1049                                 lp->next = *list;
1050                                 *list = lp;
1051                         }
1052                         return (lp->port);      /*%< host byte order */
1053                 }
1054         if (sscanf(s, "%d", &n) != 1 || n <= 0)
1055                 n = -1;
1056         return (n);
1057 }
1058
1059 /*%
1060  * Convert service name or (ascii) number to int.
1061  */
1062 int
1063 res_servicenumber(const char *p) {
1064         if (servicelist == NULL)
1065                 res_buildservicelist();
1066         return (findservice(p, &servicelist));
1067 }
1068
1069 /*%
1070  * Convert protocol name or (ascii) number to int.
1071  */
1072 int
1073 res_protocolnumber(const char *p) {
1074         if (protolist == NULL)
1075                 res_buildprotolist();
1076         return (findservice(p, &protolist));
1077 }
1078
1079 static struct servent *
1080 cgetservbyport(u_int16_t port, const char *proto) {     /*%< Host byte order. */
1081         struct valuelist **list = &servicelist;
1082         struct valuelist *lp = *list;
1083         static struct servent serv;
1084
1085         port = ntohs(port);
1086         for (; lp != NULL; lp = lp->next) {
1087                 if (port != (u_int16_t)lp->port)        /*%< Host byte order. */
1088                         continue;
1089                 if (strcasecmp(lp->proto, proto) == 0) {
1090                         if (lp != *list) {
1091                                 lp->prev->next = lp->next;
1092                                 if (lp->next)
1093                                         lp->next->prev = lp->prev;
1094                                 (*list)->prev = lp;
1095                                 lp->next = *list;
1096                                 *list = lp;
1097                         }
1098                         serv.s_name = lp->name;
1099                         serv.s_port = htons((u_int16_t)lp->port);
1100                         serv.s_proto = lp->proto;
1101                         return (&serv);
1102                 }
1103         }
1104         return (0);
1105 }
1106
1107 static struct protoent *
1108 cgetprotobynumber(int proto) {                          /*%< Host byte order. */
1109         struct valuelist **list = &protolist;
1110         struct valuelist *lp = *list;
1111         static struct protoent prot;
1112
1113         for (; lp != NULL; lp = lp->next)
1114                 if (lp->port == proto) {                /*%< Host byte order. */
1115                         if (lp != *list) {
1116                                 lp->prev->next = lp->next;
1117                                 if (lp->next)
1118                                         lp->next->prev = lp->prev;
1119                                 (*list)->prev = lp;
1120                                 lp->next = *list;
1121                                 *list = lp;
1122                         }
1123                         prot.p_name = lp->name;
1124                         prot.p_proto = lp->port;        /*%< Host byte order. */
1125                         return (&prot);
1126                 }
1127         return (0);
1128 }
1129
1130 const char *
1131 res_protocolname(int num) {
1132         static char number[8];
1133         struct protoent *pp;
1134
1135         if (protolist == NULL)
1136                 res_buildprotolist();
1137         pp = cgetprotobynumber(num);
1138         if (pp == 0)  {
1139                 (void) sprintf(number, "%d", num);
1140                 return (number);
1141         }
1142         return (pp->p_name);
1143 }
1144
1145 const char *
1146 res_servicename(u_int16_t port, const char *proto) {    /*%< Host byte order. */
1147         static char number[8];
1148         struct servent *ss;
1149
1150         if (servicelist == NULL)
1151                 res_buildservicelist();
1152         ss = cgetservbyport(htons(port), proto);
1153         if (ss == 0)  {
1154                 (void) sprintf(number, "%d", port);
1155                 return (number);
1156         }
1157         return (ss->s_name);
1158 }