contrib/isc-dhcp/minires/res_mkupdate.c

   1 /*
   2  * Copyright (c) 1996-1999 by Internet Software Consortium.
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
   9  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  10  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  11  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  12  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  13  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  14  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  15  * SOFTWARE.
  16  *
  17  * $DragonFly: src/contrib/isc-dhcp/minires/Attic/res_mkupdate.c,v 1.2 2003/10/11 21:14:23 dillon Exp $
  18  */
  19
  20 /*
  21  * Based on the Dynamic DNS reference implementation by Viraj Bais
  22  * <viraj_bais@ccm.fm.intel.com>
  23  */
  24
  25 #if !defined(lint) && !defined(SABER)
  26 static const char rcsid[] = "$Id: res_mkupdate.c,v 1.7.2.2 2003/05/19 00:33:22 dhankins Exp $";
  27 #endif /* not lint */
  28
  29 #include <sys/types.h>
  30 #include <sys/param.h>
  31
  32 #include <netinet/in.h>
  33 #include <arpa/inet.h>
  34 #include <sys/socket.h>
  35
  36 #include <errno.h>
  37 #include <limits.h>
  38 #include <netdb.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43 #include <ctype.h>
  44
  45 #include "minires/minires.h"
  46 #include "arpa/nameser.h"
  47
  48 /* Options.  Leave them on. */
  49 #define DEBUG
  50 #define MAXPORT 1024
  51
  52 static int getnum_str(const u_char **, const u_char *);
  53 static int gethexnum_str(const u_char **, const u_char *);
  54 static int getword_str(char *, int,
  55                        const unsigned char **,
  56                        const unsigned char *);
  57 static int getphrase_str(char *, int, const u_char **, const u_char *);
  58 static int getstr_str(char *, int, const u_char **, const u_char *);
  59
  60 struct valuelist {
  61         struct valuelist *      next;
  62         struct valuelist *      prev;
  63         char *                  name;
  64         char *                  proto;
  65         int                     port;
  66 };
  67
  68 static int findservice(const char *, struct valuelist **);
  69 static struct servent *cgetservbyport(unsigned, const char *);
  70
  71 #define ShrinkBuffer(x)  if ((buflen -= x) < 0) return (-2);
  72
  73 /* Forward. */
  74
  75 int res_protocolnumber(const char *);
  76 int res_servicenumber(const char *);
  77 static struct protoent *cgetprotobynumber(int);
  78
  79 /*
  80  * Form update packets.
  81  * Returns the size of the resulting packet if no error
  82  * On error,
  83  *      returns -1 if error in reading a word/number in rdata
  84  *                 portion for update packets
  85  *              -2 if length of buffer passed is insufficient
  86  *              -3 if zone section is not the first section in
  87  *                 the linked list, or section order has a problem
  88  *              -4 on a number overflow
  89  *              -5 unknown operation or no records
  90  */
  91 int
  92 res_nmkupdate(res_state statp,
  93               ns_updrec *rrecp_in, double *bp, unsigned *blp) {
  94         ns_updrec *rrecp_start = rrecp_in;
  95         HEADER *hp;
  96         u_char *cp, *sp1, *sp2;
  97         const unsigned char *startp, *endp;
  98         int n, i, soanum, multiline;
  99         ns_updrec *rrecp;
 100         struct in_addr ina;
 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         unsigned siglen, certlen;
 108         int keylen;
 109         unsigned buflen = *blp;
 110         u_char *buf = (unsigned char *)bp;
 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         sp1 = buf + 2*INT16SZ;  /* save pointer to zocount */
 123         cp = buf + HFIXEDSZ;
 124         buflen -= HFIXEDSZ;
 125         dpp = dnptrs;
 126         *dpp++ = buf;
 127         *dpp++ = NULL;
 128         lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
 129
 130         if (rrecp_start == NULL)
 131                 return (-5);
 132         else if (rrecp_start->r_section != S_ZONE)
 133                 return (-3);
 134
 135         memset(counts, 0, sizeof counts);
 136         for (rrecp = rrecp_start; rrecp; rrecp = ISC_LIST_NEXT(rrecp,
 137                                                                r_glink)) {
 138                 numrrs++;
 139                 section = rrecp->r_section;
 140                 if (section < 0 || section >= ns_s_max)
 141                         return (-1);
 142                 counts[section]++;
 143                 for (i = section + 1; i < ns_s_max; i++)
 144                         if (counts[i])
 145                                 return (-3);
 146                 rtype = rrecp->r_type;
 147                 rclass = rrecp->r_class;
 148                 rttl = rrecp->r_ttl;
 149                 /* overload class and type */
 150                 if (section == S_PREREQ) {
 151                         rttl = 0;
 152                         switch (rrecp->r_opcode) {
 153                         case YXDOMAIN:
 154                                 rclass = C_ANY;
 155                                 rtype = T_ANY;
 156                                 rrecp->r_size = 0;
 157                                 break;
 158                         case NXDOMAIN:
 159                                 rclass = C_NONE;
 160                                 rtype = T_ANY;
 161                                 rrecp->r_size = 0;
 162                                 break;
 163                         case NXRRSET:
 164                                 rclass = C_NONE;
 165                                 rrecp->r_size = 0;
 166                                 break;
 167                         case YXRRSET:
 168                                 if (rrecp->r_size == 0)
 169                                         rclass = C_ANY;
 170                                 break;
 171                         default:
 172                                 fprintf(stderr,
 173                                         "res_mkupdate: incorrect opcode: %d\n",
 174                                         rrecp->r_opcode);
 175                                 fflush(stderr);
 176                                 return (-1);
 177                         }
 178                 } else if (section == S_UPDATE) {
 179                         switch (rrecp->r_opcode) {
 180                         case DELETE:
 181                                 rclass = rrecp->r_size == 0 ? C_ANY : C_NONE;
 182                                 break;
 183                         case ADD:
 184                                 break;
 185                         default:
 186                                 fprintf(stderr,
 187                                         "res_mkupdate: incorrect opcode: %d\n",
 188                                         rrecp->r_opcode);
 189                                 fflush(stderr);
 190                                 return (-1);
 191                         }
 192                 }
 193
 194                 /*
 195                  * XXX  appending default domain to owner name is omitted,
 196                  *      fqdn must be provided
 197                  */
 198                 if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs,
 199                                  lastdnptr)) < 0)
 200                         return (-1);
 201                 cp += n;
 202                 ShrinkBuffer(n + 2*INT16SZ);
 203                 PUTSHORT(rtype, cp);
 204                 PUTSHORT(rclass, cp);
 205                 if (section == S_ZONE) {
 206                         if (numrrs != 1 || rrecp->r_type != T_SOA)
 207                                 return (-3);
 208                         continue;
 209                 }
 210                 ShrinkBuffer(INT32SZ + INT16SZ);
 211                 PUTLONG(rttl, cp);
 212                 sp2 = cp;  /* save pointer to length byte */
 213                 cp += INT16SZ;
 214                 if (rrecp->r_size == 0) {
 215                         if (section == S_UPDATE && rclass != C_ANY)
 216                                 return (-1);
 217                         else {
 218                                 PUTSHORT(0, sp2);
 219                                 continue;
 220                         }
 221                 }
 222                 startp = rrecp->r_data;
 223                 endp = startp + rrecp->r_size - 1;
 224                 /* XXX this should be done centrally. */
 225                 switch (rrecp->r_type) {
 226                 case T_A:
 227                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 228                                 return (-1);
 229                         if (!inet_aton(buf2, &ina))
 230                                 return (-1);
 231                         n1 = ntohl(ina.s_addr);
 232                         ShrinkBuffer(INT32SZ);
 233                         PUTLONG(n1, cp);
 234                         break;
 235                 case T_CNAME:
 236                 case T_MB:
 237                 case T_MG:
 238                 case T_MR:
 239                 case T_NS:
 240                 case T_PTR:
 241                         if (!getphrase_str(buf2, sizeof buf2, &startp, endp))
 242                                 return (-1);
 243                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 244                         if (n < 0)
 245                                 return (-1);
 246                         cp += n;
 247                         ShrinkBuffer(n);
 248                         break;
 249                 case T_MINFO:
 250                 case T_SOA:
 251                 case T_RP:
 252                         for (i = 0; i < 2; i++) {
 253                                 if (!getword_str(buf2, sizeof buf2, &startp,
 254                                                  endp))
 255                                 return (-1);
 256                                 n = dn_comp(buf2, cp, buflen,
 257                                             dnptrs, lastdnptr);
 258                                 if (n < 0)
 259                                         return (-1);
 260                                 cp += n;
 261                                 ShrinkBuffer(n);
 262                         }
 263                         if (rrecp->r_type == T_SOA) {
 264                                 ShrinkBuffer(5 * INT32SZ);
 265                                 while (isspace(*startp) || !*startp)
 266                                         startp++;
 267                                 if (*startp == '(') {
 268                                         multiline = 1;
 269                                         startp++;
 270                                 } else
 271                                         multiline = 0;
 272                                 /* serial, refresh, retry, expire, minimum */
 273                                 for (i = 0; i < 5; i++) {
 274                                         soanum = getnum_str(&startp, endp);
 275                                         if (soanum < 0)
 276                                                 return (-1);
 277                                         PUTLONG(soanum, cp);
 278                                 }
 279                                 if (multiline) {
 280                                         while (isspace(*startp) || !*startp)
 281                                                 startp++;
 282                                         if (*startp != ')')
 283                                                 return (-1);
 284                                 }
 285                         }
 286                         break;
 287                 case T_MX:
 288                 case T_AFSDB:
 289                 case T_RT:
 290                         n = getnum_str(&startp, endp);
 291                         if (n < 0)
 292                                 return (-1);
 293                         ShrinkBuffer(INT16SZ);
 294                         PUTSHORT(n, cp);
 295                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 296                                 return (-1);
 297                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 298                         if (n < 0)
 299                                 return (-1);
 300                         cp += n;
 301                         ShrinkBuffer(n);
 302                         break;
 303                 case T_SRV:
 304                         n = getnum_str(&startp, endp);
 305                         if (n < 0)
 306                                 return (-1);
 307                         ShrinkBuffer(INT16SZ);
 308                         PUTSHORT(n, cp);
 309
 310                         n = getnum_str(&startp, endp);
 311                         if (n < 0)
 312                                 return (-1);
 313                         ShrinkBuffer(INT16SZ);
 314                         PUTSHORT(n, cp);
 315
 316                         n = getnum_str(&startp, endp);
 317                         if (n < 0)
 318                                 return (-1);
 319                         ShrinkBuffer(INT16SZ);
 320                         PUTSHORT(n, cp);
 321
 322                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 323                                 return (-1);
 324                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 325                         if (n < 0)
 326                                 return (-1);
 327                         cp += n;
 328                         ShrinkBuffer(n);
 329                         break;
 330                 case T_PX:
 331                         n = getnum_str(&startp, endp);
 332                         if (n < 0)
 333                                 return (-1);
 334                         PUTSHORT(n, cp);
 335                         ShrinkBuffer(INT16SZ);
 336                         for (i = 0; i < 2; i++) {
 337                                 if (!getword_str(buf2, sizeof buf2, &startp,
 338                                                  endp))
 339                                         return (-1);
 340                                 n = dn_comp(buf2, cp, buflen, dnptrs,
 341                                             lastdnptr);
 342                                 if (n < 0)
 343                                         return (-1);
 344                                 cp += n;
 345                                 ShrinkBuffer(n);
 346                         }
 347                         break;
 348                 case T_WKS: {
 349                         char bm[MAXPORT/8];
 350                         unsigned maxbm = 0;
 351
 352                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 353                                 return (-1);
 354                         if (!inet_aton(buf2, &ina))
 355                                 return (-1);
 356                         n1 = ntohl(ina.s_addr);
 357                         ShrinkBuffer(INT32SZ);
 358                         PUTLONG(n1, cp);
 359
 360                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 361                                 return (-1);
 362                         if ((i = res_protocolnumber(buf2)) < 0)
 363                                 return (-1);
 364                         ShrinkBuffer(1);
 365                         *cp++ = i & 0xff;
 366
 367                         for (i = 0; i < MAXPORT/8 ; i++)
 368                                 bm[i] = 0;
 369
 370                         while (getword_str(buf2, sizeof buf2, &startp, endp)) {
 371                                 if ((n1 = res_servicenumber(buf2)) <= 0)
 372                                         return (-1);
 373
 374                                 if (n1 < MAXPORT) {
 375                                         bm[n1/8] |= (0x80>>(n1%8));
 376                                         if (n1 > maxbm)
 377                                                 maxbm = n1;
 378                                 } else
 379                                         return (-1);
 380                         }
 381                         maxbm = maxbm/8 + 1;
 382                         ShrinkBuffer(maxbm);
 383                         memcpy(cp, bm, maxbm);
 384                         cp += maxbm;
 385                         break;
 386                 }
 387                 case T_HINFO:
 388                         for (i = 0; i < 2; i++) {
 389                                 if ((n = getstr_str(buf2, sizeof buf2,
 390                                                 &startp, endp)) < 0)
 391                                         return (-1);
 392                                 if (n > 255)
 393                                         return (-1);
 394                                 ShrinkBuffer(n+1);
 395                                 *cp++ = n;
 396                                 memcpy(cp, buf2, (unsigned)n);
 397                                 cp += n;
 398                         }
 399                         break;
 400                 case T_TXT:
 401                         while (1) {
 402                                 if ((n = getstr_str(buf2, sizeof buf2,
 403                                                 &startp, endp)) < 0) {
 404                                         if (cp != (sp2 + INT16SZ))
 405                                                 break;
 406                                         return (-1);
 407                                 }
 408                                 if (n > 255)
 409                                         return (-1);
 410                                 ShrinkBuffer(n+1);
 411                                 *cp++ = n;
 412                                 memcpy(cp, buf2, (unsigned)n);
 413                                 cp += n;
 414                         }
 415                         break;
 416                 case T_X25:
 417                         /* RFC 1183 */
 418                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 419                                          endp)) < 0)
 420                                 return (-1);
 421                         if (n > 255)
 422                                 return (-1);
 423                         ShrinkBuffer(n+1);
 424                         *cp++ = n;
 425                         memcpy(cp, buf2, (unsigned)n);
 426                         cp += n;
 427                         break;
 428                 case T_ISDN:
 429                         /* RFC 1183 */
 430                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 431                                          endp)) < 0)
 432                                 return (-1);
 433                         if ((n > 255) || (n == 0))
 434                                 return (-1);
 435                         ShrinkBuffer(n+1);
 436                         *cp++ = n;
 437                         memcpy(cp, buf2, (unsigned)n);
 438                         cp += n;
 439                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 440                                          endp)) < 0)
 441                                 n = 0;
 442                         if (n > 255)
 443                                 return (-1);
 444                         ShrinkBuffer(n+1);
 445                         *cp++ = n;
 446                         memcpy(cp, buf2, (unsigned)n);
 447                         cp += n;
 448                         break;
 449 #if 0
 450                 case T_NSAP:
 451                         if ((n = inet_nsap_addr((char *)startp, (u_char *)buf2, sizeof(buf2))) != 0) {
 452                                 ShrinkBuffer(n);
 453                                 memcpy(cp, buf2, n);
 454                                 cp += n;
 455                         } else {
 456                                 return (-1);
 457                         }
 458                         break;
 459                 case T_LOC:
 460                         if ((n = loc_aton((char *)startp, (u_char *)buf2)) != 0) {
 461                                 ShrinkBuffer(n);
 462                                 memcpy(cp, buf2, n);
 463                                 cp += n;
 464                         } else
 465                                 return (-1);
 466                         break;
 467                 case ns_t_sig:
 468                     {
 469                         int sig_type, success, dateerror;
 470                         u_int32_t exptime, timesigned;
 471
 472                         /* type */
 473                         if ((n = getword_str(buf2, sizeof buf2,
 474                                              &startp, endp)) < 0)
 475                                 return (-1);
 476                         sig_type = sym_ston(__p_type_syms, buf2, &success);
 477                         if (!success || sig_type == ns_t_any)
 478                                 return (-1);
 479                         ShrinkBuffer(INT16SZ);
 480                         PUTSHORT(sig_type, cp);
 481                         /* alg */
 482                         n = getnum_str(&startp, endp);
 483                         if (n < 0)
 484                                 return (-1);
 485                         ShrinkBuffer(1);
 486                         *cp++ = n;
 487                         /* labels */
 488                         n = getnum_str(&startp, endp);
 489                         if (n <= 0 || n > 255)
 490                                 return (-1);
 491                         ShrinkBuffer(1);
 492                         *cp++ = n;
 493                         /* ottl  & expire */
 494                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 495                                 return (-1);
 496                         exptime = ns_datetosecs(buf2, &dateerror);
 497                         if (!dateerror) {
 498                                 ShrinkBuffer(INT32SZ);
 499                                 PUTLONG(rttl, cp);
 500                         }
 501                         else {
 502                                 char *ulendp;
 503                                 u_int32_t ottl;
 504
 505                                 ottl = strtoul(buf2, &ulendp, 10);
 506                                 if (ulendp != NULL && *ulendp != '\0')
 507                                         return (-1);
 508                                 ShrinkBuffer(INT32SZ);
 509                                 PUTLONG(ottl, cp);
 510                                 if (!getword_str(buf2, sizeof buf2, &startp,
 511                                                  endp))
 512                                         return (-1);
 513                                 exptime = ns_datetosecs(buf2, &dateerror);
 514                                 if (dateerror)
 515                                         return (-1);
 516                         }
 517                         /* expire */
 518                         ShrinkBuffer(INT32SZ);
 519                         PUTLONG(exptime, cp);
 520                         /* timesigned */
 521                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 522                                 return (-1);
 523                         timesigned = ns_datetosecs(buf2, &dateerror);
 524                         if (!dateerror) {
 525                                 ShrinkBuffer(INT32SZ);
 526                                 PUTLONG(timesigned, cp);
 527                         }
 528                         else
 529                                 return (-1);
 530                         /* footprint */
 531                         n = getnum_str(&startp, endp);
 532                         if (n < 0)
 533                                 return (-1);
 534                         ShrinkBuffer(INT16SZ);
 535                         PUTSHORT(n, cp);
 536                         /* signer name */
 537                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 538                                 return (-1);
 539                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 540                         if (n < 0)
 541                                 return (-1);
 542                         cp += n;
 543                         ShrinkBuffer(n);
 544                         /* sig */
 545                         if ((n = getword_str(buf2, sizeof buf2,
 546                                              &startp, endp)) < 0)
 547                                 return (-1);
 548                         siglen = b64_pton(buf2, buf3, sizeof(buf3));
 549                         if (siglen < 0)
 550                                 return (-1);
 551                         ShrinkBuffer(siglen);
 552                         memcpy(cp, buf3, siglen);
 553                         cp += siglen;
 554                         break;
 555                     }
 556                 case ns_t_nxt:
 557                     {
 558                         int success, nxt_type;
 559                         u_char data[32];
 560                         int maxtype;
 561
 562                         /* next name */
 563                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 564                                 return (-1);
 565                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 566                         if (n < 0)
 567                                 return (-1);
 568                         cp += n;
 569                         ShrinkBuffer(n);
 570                         maxtype = 0;
 571                         memset(data, 0, sizeof data);
 572                         while (1) {
 573                                 if (!getword_str(buf2, sizeof buf2, &startp,
 574                                                  endp))
 575                                         break;
 576                                 nxt_type = sym_ston(__p_type_syms, buf2,
 577                                                     &success);
 578                                 if (!success || !ns_t_rr_p(nxt_type))
 579                                         return (-1);
 580                                 NS_NXT_BIT_SET(nxt_type, data);
 581                                 if (nxt_type > maxtype)
 582                                         maxtype = nxt_type;
 583                         }
 584                         n = maxtype/NS_NXT_BITS+1;
 585                         ShrinkBuffer(n);
 586                         memcpy(cp, data, n);
 587                         cp += n;
 588                         break;
 589                     }
 590 #endif
 591 #if 1
 592                 case ns_t_key:
 593                         /* flags */
 594                         n = gethexnum_str(&startp, endp);
 595                         if (n < 0)
 596                                 return (-1);
 597                         ShrinkBuffer(INT16SZ);
 598                         PUTSHORT(n, cp);
 599                         /* proto */
 600                         n = getnum_str(&startp, endp);
 601                         if (n < 0)
 602                                 return (-1);
 603                         ShrinkBuffer(1);
 604                         *cp++ = n;
 605                         /* alg */
 606                         n = getnum_str(&startp, endp);
 607                         if (n < 0)
 608                                 return (-1);
 609                         ShrinkBuffer(1);
 610                         *cp++ = n;
 611                         /* key */
 612                         if ((n = getword_str(buf2, sizeof buf2,
 613                                              &startp, endp)) < 0)
 614                                 return (-1);
 615                         keylen = b64_pton(buf2, buf3, sizeof(buf3));
 616                         if (keylen < 0)
 617                                 return (-1);
 618                         ShrinkBuffer(keylen);
 619                         memcpy(cp, buf3, keylen);
 620                         cp += keylen;
 621                         break;
 622                 case ns_t_cert:
 623                         /* type */
 624                         n = getnum_str(&startp, endp);
 625                         if (n < 0)
 626                                 return (-1);
 627                         ShrinkBuffer(INT16SZ);
 628                         PUTSHORT(n, cp);
 629                         /* key tag */
 630                         n = getnum_str(&startp, endp);
 631                         if (n < 0)
 632                                 return (-1);
 633                         ShrinkBuffer(INT16SZ);
 634                         PUTSHORT(n, cp);
 635                         /* alg */
 636                         n = getnum_str(&startp, endp);
 637                         if (n < 0)
 638                                 return (-1);
 639                         ShrinkBuffer(1);
 640                         *cp++ = n;
 641                         /* cert */
 642                         if ((n = getword_str(buf2, sizeof buf2,
 643                                              &startp, endp)) < 0)
 644                                 return (-1);
 645                         certlen = b64_pton(buf2, buf3, sizeof(buf3));
 646                         if (certlen < 0)
 647                                 return (-1);
 648                         ShrinkBuffer(certlen);
 649                         memcpy(cp, buf3, certlen);
 650                         cp += certlen;
 651                         break;
 652 #endif
 653                 default:
 654                   fprintf(stderr, "NSupdate of RR type: %d not implemented\n",
 655                           rrecp->r_type);
 656                         return (-1);
 657                 } /*switch*/
 658                 n = (u_int16_t)((cp - sp2) - INT16SZ);
 659                 PUTSHORT(n, sp2);
 660         } /*for*/
 661
 662         hp->qdcount = htons(counts[0]);
 663         hp->ancount = htons(counts[1]);
 664         hp->nscount = htons(counts[2]);
 665         hp->arcount = htons(counts[3]);
 666         *blp = cp - buf;
 667         return 0;
 668 }
 669
 670 /*
 671  * Get a whitespace delimited word from a string (not file)
 672  * into buf. modify the start pointer to point after the
 673  * word in the string.
 674  */
 675 static int
 676 getword_str(char *buf, int size, const u_char **startpp, const u_char *endp) {
 677         char *cp;
 678         int c;
 679
 680         for (cp = buf; *startpp <= endp; ) {
 681                 c = **startpp;
 682                 if (isspace(c) || c == '\0') {
 683                         if (cp != buf) /* trailing whitespace */
 684                                 break;
 685                         else { /* leading whitespace */
 686                                 (*startpp)++;
 687                                 continue;
 688                         }
 689                 }
 690                 (*startpp)++;
 691                 if (cp >= buf+size-1)
 692                         break;
 693                 *cp++ = (u_char)c;
 694         }
 695         *cp = '\0';
 696         return (cp != buf);
 697 }
 698
 699 /*
 700  * Get a phrase - possibly containing blanks - from a string (not file)
 701  * into buf. modify the start pointer to point after the
 702  * phrase in the string.
 703  */
 704 static int
 705 getphrase_str(char *buf, int size, const u_char **startpp, const u_char *endp) {
 706         char *cp;
 707         int c;
 708
 709         for (cp = buf; *startpp <= endp; ) {
 710                 c = **startpp;
 711                 if (isspace(c) && cp == buf ) {
 712                         /* leading whitespace */
 713                         (*startpp)++;
 714                         continue;
 715                 }
 716                 else if ( c == '\0' ) {
 717                         break;
 718                 }
 719                 (*startpp)++;
 720                 if (cp >= buf+size-1)
 721                         break;
 722                 *cp++ = (u_char)c;
 723         }
 724         *cp = '\0';
 725         return (cp != buf);
 726 }
 727
 728 /*
 729  * get a white spae delimited string from memory.  Process quoted strings
 730  * and \DDD escapes.  Return length or -1 on error.  Returned string may
 731  * contain nulls.
 732  */
 733 static char digits[] = "0123456789";
 734 static int
 735 getstr_str(char *buf, int size, const u_char **startpp, const u_char *endp) {
 736         char *cp;
 737         int c, c1 = 0;
 738         int inquote = 0;
 739         int seen_quote = 0;
 740         int escape = 0;
 741         int dig = 0;
 742
 743         for (cp = buf; *startpp <= endp; ) {
 744                 if ((c = **startpp) == '\0')
 745                         break;
 746                 /* leading white space */
 747                 if ((cp == buf) && !seen_quote && isspace(c)) {
 748                         (*startpp)++;
 749                         continue;
 750                 }
 751
 752                 switch (c) {
 753                 case '\\':
 754                         if (!escape)  {
 755                                 escape = 1;
 756                                 dig = 0;
 757                                 c1 = 0;
 758                                 (*startpp)++;
 759                                 continue;
 760                         }
 761                         goto do_escape;
 762                 case '"':
 763                         if (!escape) {
 764                                 inquote = !inquote;
 765                                 seen_quote = 1;
 766                                 (*startpp)++;
 767                                 continue;
 768                         }
 769                         /* fall through */
 770                 default:
 771                 do_escape:
 772                         if (escape) {
 773                                 switch (c) {
 774                                 case '0':
 775                                 case '1':
 776                                 case '2':
 777                                 case '3':
 778                                 case '4':
 779                                 case '5':
 780                                 case '6':
 781                                 case '7':
 782                                 case '8':
 783                                 case '9':
 784                                         c1 = c1 * 10 +
 785                                                 (strchr(digits, c) - digits);
 786
 787                                         if (++dig == 3) {
 788                                                 c = c1 &0xff;
 789                                                 break;
 790                                         }
 791                                         (*startpp)++;
 792                                         continue;
 793                                 }
 794                                 escape = 0;
 795                         } else if (!inquote && isspace(c))
 796                                 goto done;
 797                         if (cp >= buf+size-1)
 798                                 goto done;
 799                         *cp++ = (u_char)c;
 800                         (*startpp)++;
 801                 }
 802         }
 803  done:
 804         *cp = '\0';
 805         return ((cp == buf)?  (seen_quote? 0: -1): (cp - buf));
 806 }
 807 /*
 808  * Get a whitespace delimited base 16 number from a string (not file) into buf
 809  * update the start pointer to point after the number in the string.
 810  */
 811 static int
 812 gethexnum_str(const u_char **startpp, const u_char *endp) {
 813         int c, n;
 814         int seendigit = 0;
 815         int m = 0;
 816
 817         if (*startpp + 2 >= endp ||
 818             strncasecmp((const char *)*startpp, "0x", 2) != 0)
 819                 return getnum_str(startpp, endp);
 820         (*startpp)+=2;
 821         for (n = 0; *startpp <= endp; ) {
 822                 c = **startpp;
 823                 if (isspace(c) || c == '\0') {
 824                         if (seendigit) /* trailing whitespace */
 825                                 break;
 826                         else { /* leading whitespace */
 827                                 (*startpp)++;
 828                                 continue;
 829                         }
 830                 }
 831                 if (c == ';') {
 832                         while ((*startpp <= endp) &&
 833                                ((c = **startpp) != '\n'))
 834                                         (*startpp)++;
 835                         if (seendigit)
 836                                 break;
 837                         continue;
 838                 }
 839                 if (!isxdigit(c)) {
 840                         if (c == ')' && seendigit) {
 841                                 (*startpp)--;
 842                                 break;
 843                         }
 844                         return (-1);
 845                 }
 846                 (*startpp)++;
 847                 if (isdigit(c))
 848                         n = n * 16 + (c - '0');
 849                 else
 850                         n = n * 16 + (tolower(c) - 'a' + 10);
 851                 seendigit = 1;
 852         }
 853         return (n + m);
 854 }
 855
 856 /*
 857  * Get a whitespace delimited base 16 number from a string (not file) into buf
 858  * update the start pointer to point after the number in the string.
 859  */
 860 static int
 861 getnum_str(const u_char **startpp, const u_char *endp) {
 862         int c, n;
 863         int seendigit = 0;
 864         int m = 0;
 865
 866         for (n = 0; *startpp <= endp; ) {
 867                 c = **startpp;
 868                 if (isspace(c) || c == '\0') {
 869                         if (seendigit) /* trailing whitespace */
 870                                 break;
 871                         else { /* leading whitespace */
 872                                 (*startpp)++;
 873                                 continue;
 874                         }
 875                 }
 876                 if (c == ';') {
 877                         while ((*startpp <= endp) &&
 878                                ((c = **startpp) != '\n'))
 879                                         (*startpp)++;
 880                         if (seendigit)
 881                                 break;
 882                         continue;
 883                 }
 884                 if (!isdigit(c)) {
 885                         if (c == ')' && seendigit) {
 886                                 (*startpp)--;
 887                                 break;
 888                         }
 889                         return (-1);
 890                 }
 891                 (*startpp)++;
 892                 n = n * 10 + (c - '0');
 893                 seendigit = 1;
 894         }
 895         return (n + m);
 896 }
 897
 898 /*
 899  * Allocate a resource record buffer & save rr info.
 900  */
 901 ns_updrec *
 902 res_mkupdrec(int section, const char *dname,
 903              u_int class, u_int type, u_long ttl) {
 904         ns_updrec *rrecp = (ns_updrec *)calloc(1, sizeof(ns_updrec));
 905
 906         if (!rrecp || !(rrecp->r_dname = strdup(dname))) {
 907                 if (rrecp)
 908                         free((char *)rrecp);
 909                 return (NULL);
 910         }
 911         rrecp->r_class = class;
 912         rrecp->r_type = type;
 913         rrecp->r_ttl = ttl;
 914         rrecp->r_section = section;
 915         return (rrecp);
 916 }
 917
 918 /*
 919  * Free a resource record buffer created by res_mkupdrec.
 920  */
 921 void
 922 res_freeupdrec(ns_updrec *rrecp) {
 923         /* Note: freeing r_dp is the caller's responsibility. */
 924         if (rrecp->r_dname != NULL)
 925                 free(rrecp->r_dname);
 926         free(rrecp);
 927 }
 928
 929 static struct valuelist *servicelist, *protolist;
 930
 931 void
 932 res_buildservicelist() {
 933         struct servent *sp;
 934         struct valuelist *slp;
 935
 936 #ifdef MAYBE_HESIOD
 937         setservent(0);
 938 #else
 939         setservent(1);
 940 #endif
 941         while ((sp = getservent()) != NULL) {
 942                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
 943                 if (!slp)
 944                         break;
 945                 slp->name = strdup(sp->s_name);
 946                 slp->proto = strdup(sp->s_proto);
 947                 if ((slp->name == NULL) || (slp->proto == NULL)) {
 948                         if (slp->name) free(slp->name);
 949                         if (slp->proto) free(slp->proto);
 950                         free(slp);
 951                         break;
 952                 }
 953                 slp->port = ntohs((u_int16_t)sp->s_port);  /* host byt order */
 954                 slp->next = servicelist;
 955                 slp->prev = NULL;
 956                 if (servicelist)
 957                         servicelist->prev = slp;
 958                 servicelist = slp;
 959         }
 960         endservent();
 961 }
 962
 963 void
 964 res_destroyservicelist() {
 965         struct valuelist *slp, *slp_next;
 966
 967         for (slp = servicelist; slp != NULL; slp = slp_next) {
 968                 slp_next = slp->next;
 969                 free(slp->name);
 970                 free(slp->proto);
 971                 free(slp);
 972         }
 973         servicelist = (struct valuelist *)0;
 974 }
 975
 976 void
 977 res_buildprotolist() {
 978         struct protoent *pp;
 979         struct valuelist *slp;
 980
 981 #ifdef MAYBE_HESIOD
 982         setprotoent(0);
 983 #else
 984         setprotoent(1);
 985 #endif
 986         while ((pp = getprotoent()) != NULL) {
 987                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
 988                 if (!slp)
 989                         break;
 990                 slp->name = strdup(pp->p_name);
 991                 if (slp->name == NULL) {
 992                         free(slp);
 993                         break;
 994                 }
 995                 slp->port = pp->p_proto;        /* host byte order */
 996                 slp->next = protolist;
 997                 slp->prev = NULL;
 998                 if (protolist)
 999                         protolist->prev = slp;
1000                 protolist = slp;
1001         }
1002         endprotoent();
1003 }
1004
1005 void
1006 res_destroyprotolist() {
1007         struct valuelist *plp, *plp_next;
1008
1009         for (plp = protolist; plp != NULL; plp = plp_next) {
1010                 plp_next = plp->next;
1011                 free(plp->name);
1012                 free(plp);
1013         }
1014         protolist = (struct valuelist *)0;
1015 }
1016
1017 static int
1018 findservice(const char *s, struct valuelist **list) {
1019         struct valuelist *lp = *list;
1020         int n;
1021
1022         for (; lp != NULL; lp = lp->next)
1023                 if (strcasecmp(lp->name, s) == 0) {
1024                         if (lp != *list) {
1025                                 lp->prev->next = lp->next;
1026                                 if (lp->next)
1027                                         lp->next->prev = lp->prev;
1028                                 (*list)->prev = lp;
1029                                 lp->next = *list;
1030                                 *list = lp;
1031                         }
1032                         return (lp->port);      /* host byte order */
1033                 }
1034         if (sscanf(s, "%d", &n) != 1 || n <= 0)
1035                 n = -1;
1036         return (n);
1037 }
1038
1039 /*
1040  * Convert service name or (ascii) number to int.
1041  */
1042 int
1043 res_servicenumber(const char *p) {
1044         if (servicelist == (struct valuelist *)0)
1045                 res_buildservicelist();
1046         return (findservice(p, &servicelist));
1047 }
1048
1049 /*
1050  * Convert protocol name or (ascii) number to int.
1051  */
1052 int
1053 res_protocolnumber(const char *p) {
1054         if (protolist == (struct valuelist *)0)
1055                 res_buildprotolist();
1056         return (findservice(p, &protolist));
1057 }
1058
1059 static struct servent *
1060 cgetservbyport(unsigned port, const char *proto) {      /* Host byte order. */
1061         struct valuelist **list = &servicelist;
1062         struct valuelist *lp = *list;
1063         static struct servent serv;
1064
1065         port = ntohs(port);
1066         for (; lp != NULL; lp = lp->next) {
1067                 if (port != (u_int16_t)lp->port)        /* Host byte order. */
1068                         continue;
1069                 if (strcasecmp(lp->proto, proto) == 0) {
1070                         if (lp != *list) {
1071                                 lp->prev->next = lp->next;
1072                                 if (lp->next)
1073                                         lp->next->prev = lp->prev;
1074                                 (*list)->prev = lp;
1075                                 lp->next = *list;
1076                                 *list = lp;
1077                         }
1078                         serv.s_name = lp->name;
1079                         serv.s_port = htons((u_int16_t)lp->port);
1080                         serv.s_proto = lp->proto;
1081                         return (&serv);
1082                 }
1083         }
1084         return (0);
1085 }
1086
1087 static struct protoent *
1088 cgetprotobynumber(int proto) {                          /* Host byte order. */
1089         struct valuelist **list = &protolist;
1090         struct valuelist *lp = *list;
1091         static struct protoent prot;
1092
1093         for (; lp != NULL; lp = lp->next)
1094                 if (lp->port == proto) {                /* Host byte order. */
1095                         if (lp != *list) {
1096                                 lp->prev->next = lp->next;
1097                                 if (lp->next)
1098                                         lp->next->prev = lp->prev;
1099                                 (*list)->prev = lp;
1100                                 lp->next = *list;
1101                                 *list = lp;
1102                         }
1103                         prot.p_name = lp->name;
1104                         prot.p_proto = lp->port;        /* Host byte order. */
1105                         return (&prot);
1106                 }
1107         return (0);
1108 }
1109
1110 const char *
1111 res_protocolname(int num) {
1112         static char number[8];
1113         struct protoent *pp;
1114
1115         if (protolist == (struct valuelist *)0)
1116                 res_buildprotolist();
1117         pp = cgetprotobynumber(num);
1118         if (pp == 0)  {
1119                 (void) sprintf(number, "%d", num);
1120                 return (number);
1121         }
1122         return (pp->p_name);
1123 }
1124
1125 const char *
1126 res_servicename(u_int16_t port, const char *proto) {    /* Host byte order. */
1127         static char number[8];
1128         struct servent *ss;
1129
1130         if (servicelist == (struct valuelist *)0)
1131                 res_buildservicelist();
1132         ss = cgetservbyport(htons(port), proto);
1133         if (ss == 0)  {
1134                 (void) sprintf(number, "%d", port);
1135                 return (number);
1136         }
1137         return (ss->s_name);
1138 }