contrib/dhcp-3.0/minires/res_mkupdate.c

   1 /*
   2  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (c) 1996-2003 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  *   Internet Systems Consortium, Inc.
  18  *   950 Charter Street
  19  *   Redwood City, CA 94063
  20  *   <info@isc.org>
  21  *   http://www.isc.org/
  22  */
  23
  24 /*
  25  * Based on the Dynamic DNS reference implementation by Viraj Bais
  26  * <viraj_bais@ccm.fm.intel.com>
  27  */
  28
  29 #if !defined(lint) && !defined(SABER)
  30 static const char rcsid[] = "$Id: res_mkupdate.c,v 1.7.2.3 2004/06/10 17:59:43 dhankins Exp $";
  31 #endif /* not lint */
  32
  33 #include <sys/types.h>
  34 #include <sys/param.h>
  35
  36 #include <netinet/in.h>
  37 #include <arpa/inet.h>
  38 #include <sys/socket.h>
  39
  40 #include <errno.h>
  41 #include <limits.h>
  42 #include <netdb.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include <ctype.h>
  48
  49 #include "minires/minires.h"
  50 #include "arpa/nameser.h"
  51
  52 /* Options.  Leave them on. */
  53 #define DEBUG
  54 #define MAXPORT 1024
  55
  56 static int getnum_str(const u_char **, const u_char *);
  57 static int gethexnum_str(const u_char **, const u_char *);
  58 static int getword_str(char *, int,
  59                        const unsigned char **,
  60                        const unsigned char *);
  61 static int getphrase_str(char *, int, const u_char **, const u_char *);
  62 static int getstr_str(char *, int, const u_char **, const u_char *);
  63
  64 struct valuelist {
  65         struct valuelist *      next;
  66         struct valuelist *      prev;
  67         char *                  name;
  68         char *                  proto;
  69         int                     port;
  70 };
  71
  72 static int findservice(const char *, struct valuelist **);
  73 static struct servent *cgetservbyport(unsigned, const char *);
  74
  75 #define ShrinkBuffer(x)  if ((buflen -= x) < 0) return (-2);
  76
  77 /* Forward. */
  78
  79 int res_protocolnumber(const char *);
  80 int res_servicenumber(const char *);
  81 static struct protoent *cgetprotobynumber(int);
  82
  83 /*
  84  * Form update packets.
  85  * Returns the size of the resulting packet if no error
  86  * On error,
  87  *      returns -1 if error in reading a word/number in rdata
  88  *                 portion for update packets
  89  *              -2 if length of buffer passed is insufficient
  90  *              -3 if zone section is not the first section in
  91  *                 the linked list, or section order has a problem
  92  *              -4 on a number overflow
  93  *              -5 unknown operation or no records
  94  */
  95 int
  96 res_nmkupdate(res_state statp,
  97               ns_updrec *rrecp_in, double *bp, unsigned *blp) {
  98         ns_updrec *rrecp_start = rrecp_in;
  99         HEADER *hp;
 100         u_char *cp, *sp1, *sp2;
 101         const unsigned char *startp, *endp;
 102         int n, i, soanum, multiline;
 103         ns_updrec *rrecp;
 104         struct in_addr ina;
 105         char buf2[MAXDNAME];
 106         u_char buf3[MAXDNAME];
 107         int section, numrrs = 0, counts[ns_s_max];
 108         u_int16_t rtype, rclass;
 109         u_int32_t n1, rttl;
 110         u_char *dnptrs[20], **dpp, **lastdnptr;
 111         unsigned siglen, certlen;
 112         int keylen;
 113         unsigned buflen = *blp;
 114         u_char *buf = (unsigned char *)bp;
 115
 116         /*
 117          * Initialize header fields.
 118          */
 119         if ((buf == NULL) || (buflen < HFIXEDSZ))
 120                 return -1;
 121         memset(buf, 0, HFIXEDSZ);
 122         hp = (HEADER *) buf;
 123         hp->id = htons(++statp->id);
 124         hp->opcode = ns_o_update;
 125         hp->rcode = NOERROR;
 126         sp1 = buf + 2*INT16SZ;  /* save pointer to zocount */
 127         cp = buf + HFIXEDSZ;
 128         buflen -= HFIXEDSZ;
 129         dpp = dnptrs;
 130         *dpp++ = buf;
 131         *dpp++ = NULL;
 132         lastdnptr = dnptrs + sizeof dnptrs / sizeof dnptrs[0];
 133
 134         if (rrecp_start == NULL)
 135                 return (-5);
 136         else if (rrecp_start->r_section != S_ZONE)
 137                 return (-3);
 138
 139         memset(counts, 0, sizeof counts);
 140         for (rrecp = rrecp_start; rrecp; rrecp = ISC_LIST_NEXT(rrecp,
 141                                                                r_glink)) {
 142                 numrrs++;
 143                 section = rrecp->r_section;
 144                 if (section < 0 || section >= ns_s_max)
 145                         return (-1);
 146                 counts[section]++;
 147                 for (i = section + 1; i < ns_s_max; i++)
 148                         if (counts[i])
 149                                 return (-3);
 150                 rtype = rrecp->r_type;
 151                 rclass = rrecp->r_class;
 152                 rttl = rrecp->r_ttl;
 153                 /* overload class and type */
 154                 if (section == S_PREREQ) {
 155                         rttl = 0;
 156                         switch (rrecp->r_opcode) {
 157                         case YXDOMAIN:
 158                                 rclass = C_ANY;
 159                                 rtype = T_ANY;
 160                                 rrecp->r_size = 0;
 161                                 break;
 162                         case NXDOMAIN:
 163                                 rclass = C_NONE;
 164                                 rtype = T_ANY;
 165                                 rrecp->r_size = 0;
 166                                 break;
 167                         case NXRRSET:
 168                                 rclass = C_NONE;
 169                                 rrecp->r_size = 0;
 170                                 break;
 171                         case YXRRSET:
 172                                 if (rrecp->r_size == 0)
 173                                         rclass = C_ANY;
 174                                 break;
 175                         default:
 176                                 fprintf(stderr,
 177                                         "res_mkupdate: incorrect opcode: %d\n",
 178                                         rrecp->r_opcode);
 179                                 fflush(stderr);
 180                                 return (-1);
 181                         }
 182                 } else if (section == S_UPDATE) {
 183                         switch (rrecp->r_opcode) {
 184                         case DELETE:
 185                                 rclass = rrecp->r_size == 0 ? C_ANY : C_NONE;
 186                                 break;
 187                         case ADD:
 188                                 break;
 189                         default:
 190                                 fprintf(stderr,
 191                                         "res_mkupdate: incorrect opcode: %d\n",
 192                                         rrecp->r_opcode);
 193                                 fflush(stderr);
 194                                 return (-1);
 195                         }
 196                 }
 197
 198                 /*
 199                  * XXX  appending default domain to owner name is omitted,
 200                  *      fqdn must be provided
 201                  */
 202                 if ((n = dn_comp(rrecp->r_dname, cp, buflen, dnptrs,
 203                                  lastdnptr)) < 0)
 204                         return (-1);
 205                 cp += n;
 206                 ShrinkBuffer(n + 2*INT16SZ);
 207                 PUTSHORT(rtype, cp);
 208                 PUTSHORT(rclass, cp);
 209                 if (section == S_ZONE) {
 210                         if (numrrs != 1 || rrecp->r_type != T_SOA)
 211                                 return (-3);
 212                         continue;
 213                 }
 214                 ShrinkBuffer(INT32SZ + INT16SZ);
 215                 PUTLONG(rttl, cp);
 216                 sp2 = cp;  /* save pointer to length byte */
 217                 cp += INT16SZ;
 218                 if (rrecp->r_size == 0) {
 219                         if (section == S_UPDATE && rclass != C_ANY)
 220                                 return (-1);
 221                         else {
 222                                 PUTSHORT(0, sp2);
 223                                 continue;
 224                         }
 225                 }
 226                 startp = rrecp->r_data;
 227                 endp = startp + rrecp->r_size - 1;
 228                 /* XXX this should be done centrally. */
 229                 switch (rrecp->r_type) {
 230                 case T_A:
 231                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 232                                 return (-1);
 233                         if (!inet_aton(buf2, &ina))
 234                                 return (-1);
 235                         n1 = ntohl(ina.s_addr);
 236                         ShrinkBuffer(INT32SZ);
 237                         PUTLONG(n1, cp);
 238                         break;
 239                 case T_CNAME:
 240                 case T_MB:
 241                 case T_MG:
 242                 case T_MR:
 243                 case T_NS:
 244                 case T_PTR:
 245                         if (!getphrase_str(buf2, sizeof buf2, &startp, endp))
 246                                 return (-1);
 247                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 248                         if (n < 0)
 249                                 return (-1);
 250                         cp += n;
 251                         ShrinkBuffer(n);
 252                         break;
 253                 case T_MINFO:
 254                 case T_SOA:
 255                 case T_RP:
 256                         for (i = 0; i < 2; i++) {
 257                                 if (!getword_str(buf2, sizeof buf2, &startp,
 258                                                  endp))
 259                                 return (-1);
 260                                 n = dn_comp(buf2, cp, buflen,
 261                                             dnptrs, lastdnptr);
 262                                 if (n < 0)
 263                                         return (-1);
 264                                 cp += n;
 265                                 ShrinkBuffer(n);
 266                         }
 267                         if (rrecp->r_type == T_SOA) {
 268                                 ShrinkBuffer(5 * INT32SZ);
 269                                 while (isspace(*startp) || !*startp)
 270                                         startp++;
 271                                 if (*startp == '(') {
 272                                         multiline = 1;
 273                                         startp++;
 274                                 } else
 275                                         multiline = 0;
 276                                 /* serial, refresh, retry, expire, minimum */
 277                                 for (i = 0; i < 5; i++) {
 278                                         soanum = getnum_str(&startp, endp);
 279                                         if (soanum < 0)
 280                                                 return (-1);
 281                                         PUTLONG(soanum, cp);
 282                                 }
 283                                 if (multiline) {
 284                                         while (isspace(*startp) || !*startp)
 285                                                 startp++;
 286                                         if (*startp != ')')
 287                                                 return (-1);
 288                                 }
 289                         }
 290                         break;
 291                 case T_MX:
 292                 case T_AFSDB:
 293                 case T_RT:
 294                         n = getnum_str(&startp, endp);
 295                         if (n < 0)
 296                                 return (-1);
 297                         ShrinkBuffer(INT16SZ);
 298                         PUTSHORT(n, cp);
 299                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 300                                 return (-1);
 301                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 302                         if (n < 0)
 303                                 return (-1);
 304                         cp += n;
 305                         ShrinkBuffer(n);
 306                         break;
 307                 case T_SRV:
 308                         n = getnum_str(&startp, endp);
 309                         if (n < 0)
 310                                 return (-1);
 311                         ShrinkBuffer(INT16SZ);
 312                         PUTSHORT(n, cp);
 313
 314                         n = getnum_str(&startp, endp);
 315                         if (n < 0)
 316                                 return (-1);
 317                         ShrinkBuffer(INT16SZ);
 318                         PUTSHORT(n, cp);
 319
 320                         n = getnum_str(&startp, endp);
 321                         if (n < 0)
 322                                 return (-1);
 323                         ShrinkBuffer(INT16SZ);
 324                         PUTSHORT(n, cp);
 325
 326                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 327                                 return (-1);
 328                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 329                         if (n < 0)
 330                                 return (-1);
 331                         cp += n;
 332                         ShrinkBuffer(n);
 333                         break;
 334                 case T_PX:
 335                         n = getnum_str(&startp, endp);
 336                         if (n < 0)
 337                                 return (-1);
 338                         PUTSHORT(n, cp);
 339                         ShrinkBuffer(INT16SZ);
 340                         for (i = 0; i < 2; i++) {
 341                                 if (!getword_str(buf2, sizeof buf2, &startp,
 342                                                  endp))
 343                                         return (-1);
 344                                 n = dn_comp(buf2, cp, buflen, dnptrs,
 345                                             lastdnptr);
 346                                 if (n < 0)
 347                                         return (-1);
 348                                 cp += n;
 349                                 ShrinkBuffer(n);
 350                         }
 351                         break;
 352                 case T_WKS: {
 353                         char bm[MAXPORT/8];
 354                         unsigned maxbm = 0;
 355
 356                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 357                                 return (-1);
 358                         if (!inet_aton(buf2, &ina))
 359                                 return (-1);
 360                         n1 = ntohl(ina.s_addr);
 361                         ShrinkBuffer(INT32SZ);
 362                         PUTLONG(n1, cp);
 363
 364                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 365                                 return (-1);
 366                         if ((i = res_protocolnumber(buf2)) < 0)
 367                                 return (-1);
 368                         ShrinkBuffer(1);
 369                         *cp++ = i & 0xff;
 370
 371                         for (i = 0; i < MAXPORT/8 ; i++)
 372                                 bm[i] = 0;
 373
 374                         while (getword_str(buf2, sizeof buf2, &startp, endp)) {
 375                                 if ((n1 = res_servicenumber(buf2)) <= 0)
 376                                         return (-1);
 377
 378                                 if (n1 < MAXPORT) {
 379                                         bm[n1/8] |= (0x80>>(n1%8));
 380                                         if (n1 > maxbm)
 381                                                 maxbm = n1;
 382                                 } else
 383                                         return (-1);
 384                         }
 385                         maxbm = maxbm/8 + 1;
 386                         ShrinkBuffer(maxbm);
 387                         memcpy(cp, bm, maxbm);
 388                         cp += maxbm;
 389                         break;
 390                 }
 391                 case T_HINFO:
 392                         for (i = 0; i < 2; i++) {
 393                                 if ((n = getstr_str(buf2, sizeof buf2,
 394                                                 &startp, endp)) < 0)
 395                                         return (-1);
 396                                 if (n > 255)
 397                                         return (-1);
 398                                 ShrinkBuffer(n+1);
 399                                 *cp++ = n;
 400                                 memcpy(cp, buf2, (unsigned)n);
 401                                 cp += n;
 402                         }
 403                         break;
 404                 case T_TXT:
 405                         while (1) {
 406                                 if ((n = getstr_str(buf2, sizeof buf2,
 407                                                 &startp, endp)) < 0) {
 408                                         if (cp != (sp2 + INT16SZ))
 409                                                 break;
 410                                         return (-1);
 411                                 }
 412                                 if (n > 255)
 413                                         return (-1);
 414                                 ShrinkBuffer(n+1);
 415                                 *cp++ = n;
 416                                 memcpy(cp, buf2, (unsigned)n);
 417                                 cp += n;
 418                         }
 419                         break;
 420                 case T_X25:
 421                         /* RFC 1183 */
 422                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 423                                          endp)) < 0)
 424                                 return (-1);
 425                         if (n > 255)
 426                                 return (-1);
 427                         ShrinkBuffer(n+1);
 428                         *cp++ = n;
 429                         memcpy(cp, buf2, (unsigned)n);
 430                         cp += n;
 431                         break;
 432                 case T_ISDN:
 433                         /* RFC 1183 */
 434                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 435                                          endp)) < 0)
 436                                 return (-1);
 437                         if ((n > 255) || (n == 0))
 438                                 return (-1);
 439                         ShrinkBuffer(n+1);
 440                         *cp++ = n;
 441                         memcpy(cp, buf2, (unsigned)n);
 442                         cp += n;
 443                         if ((n = getstr_str(buf2, sizeof buf2, &startp,
 444                                          endp)) < 0)
 445                                 n = 0;
 446                         if (n > 255)
 447                                 return (-1);
 448                         ShrinkBuffer(n+1);
 449                         *cp++ = n;
 450                         memcpy(cp, buf2, (unsigned)n);
 451                         cp += n;
 452                         break;
 453 #if 0
 454                 case T_NSAP:
 455                         if ((n = inet_nsap_addr((char *)startp, (u_char *)buf2, sizeof(buf2))) != 0) {
 456                                 ShrinkBuffer(n);
 457                                 memcpy(cp, buf2, n);
 458                                 cp += n;
 459                         } else {
 460                                 return (-1);
 461                         }
 462                         break;
 463                 case T_LOC:
 464                         if ((n = loc_aton((char *)startp, (u_char *)buf2)) != 0) {
 465                                 ShrinkBuffer(n);
 466                                 memcpy(cp, buf2, n);
 467                                 cp += n;
 468                         } else
 469                                 return (-1);
 470                         break;
 471                 case ns_t_sig:
 472                     {
 473                         int sig_type, success, dateerror;
 474                         u_int32_t exptime, timesigned;
 475
 476                         /* type */
 477                         if ((n = getword_str(buf2, sizeof buf2,
 478                                              &startp, endp)) < 0)
 479                                 return (-1);
 480                         sig_type = sym_ston(__p_type_syms, buf2, &success);
 481                         if (!success || sig_type == ns_t_any)
 482                                 return (-1);
 483                         ShrinkBuffer(INT16SZ);
 484                         PUTSHORT(sig_type, cp);
 485                         /* alg */
 486                         n = getnum_str(&startp, endp);
 487                         if (n < 0)
 488                                 return (-1);
 489                         ShrinkBuffer(1);
 490                         *cp++ = n;
 491                         /* labels */
 492                         n = getnum_str(&startp, endp);
 493                         if (n <= 0 || n > 255)
 494                                 return (-1);
 495                         ShrinkBuffer(1);
 496                         *cp++ = n;
 497                         /* ottl  & expire */
 498                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 499                                 return (-1);
 500                         exptime = ns_datetosecs(buf2, &dateerror);
 501                         if (!dateerror) {
 502                                 ShrinkBuffer(INT32SZ);
 503                                 PUTLONG(rttl, cp);
 504                         }
 505                         else {
 506                                 char *ulendp;
 507                                 u_int32_t ottl;
 508
 509                                 ottl = strtoul(buf2, &ulendp, 10);
 510                                 if (ulendp != NULL && *ulendp != '\0')
 511                                         return (-1);
 512                                 ShrinkBuffer(INT32SZ);
 513                                 PUTLONG(ottl, cp);
 514                                 if (!getword_str(buf2, sizeof buf2, &startp,
 515                                                  endp))
 516                                         return (-1);
 517                                 exptime = ns_datetosecs(buf2, &dateerror);
 518                                 if (dateerror)
 519                                         return (-1);
 520                         }
 521                         /* expire */
 522                         ShrinkBuffer(INT32SZ);
 523                         PUTLONG(exptime, cp);
 524                         /* timesigned */
 525                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 526                                 return (-1);
 527                         timesigned = ns_datetosecs(buf2, &dateerror);
 528                         if (!dateerror) {
 529                                 ShrinkBuffer(INT32SZ);
 530                                 PUTLONG(timesigned, cp);
 531                         }
 532                         else
 533                                 return (-1);
 534                         /* footprint */
 535                         n = getnum_str(&startp, endp);
 536                         if (n < 0)
 537                                 return (-1);
 538                         ShrinkBuffer(INT16SZ);
 539                         PUTSHORT(n, cp);
 540                         /* signer name */
 541                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 542                                 return (-1);
 543                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 544                         if (n < 0)
 545                                 return (-1);
 546                         cp += n;
 547                         ShrinkBuffer(n);
 548                         /* sig */
 549                         if ((n = getword_str(buf2, sizeof buf2,
 550                                              &startp, endp)) < 0)
 551                                 return (-1);
 552                         siglen = b64_pton(buf2, buf3, sizeof(buf3));
 553                         if (siglen < 0)
 554                                 return (-1);
 555                         ShrinkBuffer(siglen);
 556                         memcpy(cp, buf3, siglen);
 557                         cp += siglen;
 558                         break;
 559                     }
 560                 case ns_t_nxt:
 561                     {
 562                         int success, nxt_type;
 563                         u_char data[32];
 564                         int maxtype;
 565
 566                         /* next name */
 567                         if (!getword_str(buf2, sizeof buf2, &startp, endp))
 568                                 return (-1);
 569                         n = dn_comp(buf2, cp, buflen, dnptrs, lastdnptr);
 570                         if (n < 0)
 571                                 return (-1);
 572                         cp += n;
 573                         ShrinkBuffer(n);
 574                         maxtype = 0;
 575                         memset(data, 0, sizeof data);
 576                         while (1) {
 577                                 if (!getword_str(buf2, sizeof buf2, &startp,
 578                                                  endp))
 579                                         break;
 580                                 nxt_type = sym_ston(__p_type_syms, buf2,
 581                                                     &success);
 582                                 if (!success || !ns_t_rr_p(nxt_type))
 583                                         return (-1);
 584                                 NS_NXT_BIT_SET(nxt_type, data);
 585                                 if (nxt_type > maxtype)
 586                                         maxtype = nxt_type;
 587                         }
 588                         n = maxtype/NS_NXT_BITS+1;
 589                         ShrinkBuffer(n);
 590                         memcpy(cp, data, n);
 591                         cp += n;
 592                         break;
 593                     }
 594 #endif
 595 #if 1
 596                 case ns_t_key:
 597                         /* flags */
 598                         n = gethexnum_str(&startp, endp);
 599                         if (n < 0)
 600                                 return (-1);
 601                         ShrinkBuffer(INT16SZ);
 602                         PUTSHORT(n, cp);
 603                         /* proto */
 604                         n = getnum_str(&startp, endp);
 605                         if (n < 0)
 606                                 return (-1);
 607                         ShrinkBuffer(1);
 608                         *cp++ = n;
 609                         /* alg */
 610                         n = getnum_str(&startp, endp);
 611                         if (n < 0)
 612                                 return (-1);
 613                         ShrinkBuffer(1);
 614                         *cp++ = n;
 615                         /* key */
 616                         if ((n = getword_str(buf2, sizeof buf2,
 617                                              &startp, endp)) < 0)
 618                                 return (-1);
 619                         keylen = b64_pton(buf2, buf3, sizeof(buf3));
 620                         if (keylen < 0)
 621                                 return (-1);
 622                         ShrinkBuffer(keylen);
 623                         memcpy(cp, buf3, keylen);
 624                         cp += keylen;
 625                         break;
 626                 case ns_t_cert:
 627                         /* type */
 628                         n = getnum_str(&startp, endp);
 629                         if (n < 0)
 630                                 return (-1);
 631                         ShrinkBuffer(INT16SZ);
 632                         PUTSHORT(n, cp);
 633                         /* key tag */
 634                         n = getnum_str(&startp, endp);
 635                         if (n < 0)
 636                                 return (-1);
 637                         ShrinkBuffer(INT16SZ);
 638                         PUTSHORT(n, cp);
 639                         /* alg */
 640                         n = getnum_str(&startp, endp);
 641                         if (n < 0)
 642                                 return (-1);
 643                         ShrinkBuffer(1);
 644                         *cp++ = n;
 645                         /* cert */
 646                         if ((n = getword_str(buf2, sizeof buf2,
 647                                              &startp, endp)) < 0)
 648                                 return (-1);
 649                         certlen = b64_pton(buf2, buf3, sizeof(buf3));
 650                         if (certlen < 0)
 651                                 return (-1);
 652                         ShrinkBuffer(certlen);
 653                         memcpy(cp, buf3, certlen);
 654                         cp += certlen;
 655                         break;
 656 #endif
 657                 default:
 658                   fprintf(stderr, "NSupdate of RR type: %d not implemented\n",
 659                           rrecp->r_type);
 660                         return (-1);
 661                 } /*switch*/
 662                 n = (u_int16_t)((cp - sp2) - INT16SZ);
 663                 PUTSHORT(n, sp2);
 664         } /*for*/
 665
 666         hp->qdcount = htons(counts[0]);
 667         hp->ancount = htons(counts[1]);
 668         hp->nscount = htons(counts[2]);
 669         hp->arcount = htons(counts[3]);
 670         *blp = cp - buf;
 671         return 0;
 672 }
 673
 674 /*
 675  * Get a whitespace delimited word from a string (not file)
 676  * into buf. modify the start pointer to point after the
 677  * word in the string.
 678  */
 679 static int
 680 getword_str(char *buf, int size, const u_char **startpp, const u_char *endp) {
 681         char *cp;
 682         int c;
 683
 684         for (cp = buf; *startpp <= endp; ) {
 685                 c = **startpp;
 686                 if (isspace(c) || c == '\0') {
 687                         if (cp != buf) /* trailing whitespace */
 688                                 break;
 689                         else { /* leading whitespace */
 690                                 (*startpp)++;
 691                                 continue;
 692                         }
 693                 }
 694                 (*startpp)++;
 695                 if (cp >= buf+size-1)
 696                         break;
 697                 *cp++ = (u_char)c;
 698         }
 699         *cp = '\0';
 700         return (cp != buf);
 701 }
 702
 703 /*
 704  * Get a phrase - possibly containing blanks - from a string (not file)
 705  * into buf. modify the start pointer to point after the
 706  * phrase in the string.
 707  */
 708 static int
 709 getphrase_str(char *buf, int size, const u_char **startpp, const u_char *endp) {
 710         char *cp;
 711         int c;
 712
 713         for (cp = buf; *startpp <= endp; ) {
 714                 c = **startpp;
 715                 if (isspace(c) && cp == buf ) {
 716                         /* leading whitespace */
 717                         (*startpp)++;
 718                         continue;
 719                 }
 720                 else if ( c == '\0' ) {
 721                         break;
 722                 }
 723                 (*startpp)++;
 724                 if (cp >= buf+size-1)
 725                         break;
 726                 *cp++ = (u_char)c;
 727         }
 728         *cp = '\0';
 729         return (cp != buf);
 730 }
 731
 732 /*
 733  * get a white spae delimited string from memory.  Process quoted strings
 734  * and \DDD escapes.  Return length or -1 on error.  Returned string may
 735  * contain nulls.
 736  */
 737 static char digits[] = "0123456789";
 738 static int
 739 getstr_str(char *buf, int size, const u_char **startpp, const u_char *endp) {
 740         char *cp;
 741         int c, c1 = 0;
 742         int inquote = 0;
 743         int seen_quote = 0;
 744         int escape = 0;
 745         int dig = 0;
 746
 747         for (cp = buf; *startpp <= endp; ) {
 748                 if ((c = **startpp) == '\0')
 749                         break;
 750                 /* leading white space */
 751                 if ((cp == buf) && !seen_quote && isspace(c)) {
 752                         (*startpp)++;
 753                         continue;
 754                 }
 755
 756                 switch (c) {
 757                 case '\\':
 758                         if (!escape)  {
 759                                 escape = 1;
 760                                 dig = 0;
 761                                 c1 = 0;
 762                                 (*startpp)++;
 763                                 continue;
 764                         }
 765                         goto do_escape;
 766                 case '"':
 767                         if (!escape) {
 768                                 inquote = !inquote;
 769                                 seen_quote = 1;
 770                                 (*startpp)++;
 771                                 continue;
 772                         }
 773                         /* fall through */
 774                 default:
 775                 do_escape:
 776                         if (escape) {
 777                                 switch (c) {
 778                                 case '0':
 779                                 case '1':
 780                                 case '2':
 781                                 case '3':
 782                                 case '4':
 783                                 case '5':
 784                                 case '6':
 785                                 case '7':
 786                                 case '8':
 787                                 case '9':
 788                                         c1 = c1 * 10 +
 789                                                 (strchr(digits, c) - digits);
 790
 791                                         if (++dig == 3) {
 792                                                 c = c1 &0xff;
 793                                                 break;
 794                                         }
 795                                         (*startpp)++;
 796                                         continue;
 797                                 }
 798                                 escape = 0;
 799                         } else if (!inquote && isspace(c))
 800                                 goto done;
 801                         if (cp >= buf+size-1)
 802                                 goto done;
 803                         *cp++ = (u_char)c;
 804                         (*startpp)++;
 805                 }
 806         }
 807  done:
 808         *cp = '\0';
 809         return ((cp == buf)?  (seen_quote? 0: -1): (cp - buf));
 810 }
 811 /*
 812  * Get a whitespace delimited base 16 number from a string (not file) into buf
 813  * update the start pointer to point after the number in the string.
 814  */
 815 static int
 816 gethexnum_str(const u_char **startpp, const u_char *endp) {
 817         int c, n;
 818         int seendigit = 0;
 819         int m = 0;
 820
 821         if (*startpp + 2 >= endp ||
 822             strncasecmp((const char *)*startpp, "0x", 2) != 0)
 823                 return getnum_str(startpp, endp);
 824         (*startpp)+=2;
 825         for (n = 0; *startpp <= endp; ) {
 826                 c = **startpp;
 827                 if (isspace(c) || c == '\0') {
 828                         if (seendigit) /* trailing whitespace */
 829                                 break;
 830                         else { /* leading whitespace */
 831                                 (*startpp)++;
 832                                 continue;
 833                         }
 834                 }
 835                 if (c == ';') {
 836                         while ((*startpp <= endp) &&
 837                                ((c = **startpp) != '\n'))
 838                                         (*startpp)++;
 839                         if (seendigit)
 840                                 break;
 841                         continue;
 842                 }
 843                 if (!isxdigit(c)) {
 844                         if (c == ')' && seendigit) {
 845                                 (*startpp)--;
 846                                 break;
 847                         }
 848                         return (-1);
 849                 }
 850                 (*startpp)++;
 851                 if (isdigit(c))
 852                         n = n * 16 + (c - '0');
 853                 else
 854                         n = n * 16 + (tolower(c) - 'a' + 10);
 855                 seendigit = 1;
 856         }
 857         return (n + m);
 858 }
 859
 860 /*
 861  * Get a whitespace delimited base 16 number from a string (not file) into buf
 862  * update the start pointer to point after the number in the string.
 863  */
 864 static int
 865 getnum_str(const u_char **startpp, const u_char *endp) {
 866         int c, n;
 867         int seendigit = 0;
 868         int m = 0;
 869
 870         for (n = 0; *startpp <= endp; ) {
 871                 c = **startpp;
 872                 if (isspace(c) || c == '\0') {
 873                         if (seendigit) /* trailing whitespace */
 874                                 break;
 875                         else { /* leading whitespace */
 876                                 (*startpp)++;
 877                                 continue;
 878                         }
 879                 }
 880                 if (c == ';') {
 881                         while ((*startpp <= endp) &&
 882                                ((c = **startpp) != '\n'))
 883                                         (*startpp)++;
 884                         if (seendigit)
 885                                 break;
 886                         continue;
 887                 }
 888                 if (!isdigit(c)) {
 889                         if (c == ')' && seendigit) {
 890                                 (*startpp)--;
 891                                 break;
 892                         }
 893                         return (-1);
 894                 }
 895                 (*startpp)++;
 896                 n = n * 10 + (c - '0');
 897                 seendigit = 1;
 898         }
 899         return (n + m);
 900 }
 901
 902 /*
 903  * Allocate a resource record buffer & save rr info.
 904  */
 905 ns_updrec *
 906 res_mkupdrec(int section, const char *dname,
 907              u_int class, u_int type, u_long ttl) {
 908         ns_updrec *rrecp = (ns_updrec *)calloc(1, sizeof(ns_updrec));
 909
 910         if (!rrecp || !(rrecp->r_dname = strdup(dname))) {
 911                 if (rrecp)
 912                         free((char *)rrecp);
 913                 return (NULL);
 914         }
 915         rrecp->r_class = class;
 916         rrecp->r_type = type;
 917         rrecp->r_ttl = ttl;
 918         rrecp->r_section = section;
 919         return (rrecp);
 920 }
 921
 922 /*
 923  * Free a resource record buffer created by res_mkupdrec.
 924  */
 925 void
 926 res_freeupdrec(ns_updrec *rrecp) {
 927         /* Note: freeing r_dp is the caller's responsibility. */
 928         if (rrecp->r_dname != NULL)
 929                 free(rrecp->r_dname);
 930         free(rrecp);
 931 }
 932
 933 static struct valuelist *servicelist, *protolist;
 934
 935 void
 936 res_buildservicelist() {
 937         struct servent *sp;
 938         struct valuelist *slp;
 939
 940 #ifdef MAYBE_HESIOD
 941         setservent(0);
 942 #else
 943         setservent(1);
 944 #endif
 945         while ((sp = getservent()) != NULL) {
 946                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
 947                 if (!slp)
 948                         break;
 949                 slp->name = strdup(sp->s_name);
 950                 slp->proto = strdup(sp->s_proto);
 951                 if ((slp->name == NULL) || (slp->proto == NULL)) {
 952                         if (slp->name) free(slp->name);
 953                         if (slp->proto) free(slp->proto);
 954                         free(slp);
 955                         break;
 956                 }
 957                 slp->port = ntohs((u_int16_t)sp->s_port);  /* host byt order */
 958                 slp->next = servicelist;
 959                 slp->prev = NULL;
 960                 if (servicelist)
 961                         servicelist->prev = slp;
 962                 servicelist = slp;
 963         }
 964         endservent();
 965 }
 966
 967 void
 968 res_destroyservicelist() {
 969         struct valuelist *slp, *slp_next;
 970
 971         for (slp = servicelist; slp != NULL; slp = slp_next) {
 972                 slp_next = slp->next;
 973                 free(slp->name);
 974                 free(slp->proto);
 975                 free(slp);
 976         }
 977         servicelist = (struct valuelist *)0;
 978 }
 979
 980 void
 981 res_buildprotolist() {
 982         struct protoent *pp;
 983         struct valuelist *slp;
 984
 985 #ifdef MAYBE_HESIOD
 986         setprotoent(0);
 987 #else
 988         setprotoent(1);
 989 #endif
 990         while ((pp = getprotoent()) != NULL) {
 991                 slp = (struct valuelist *)malloc(sizeof(struct valuelist));
 992                 if (!slp)
 993                         break;
 994                 slp->name = strdup(pp->p_name);
 995                 if (slp->name == NULL) {
 996                         free(slp);
 997                         break;
 998                 }
 999                 slp->port = pp->p_proto;        /* host byte order */
1000                 slp->next = protolist;
1001                 slp->prev = NULL;
1002                 if (protolist)
1003                         protolist->prev = slp;
1004                 protolist = slp;
1005         }
1006         endprotoent();
1007 }
1008
1009 void
1010 res_destroyprotolist() {
1011         struct valuelist *plp, *plp_next;
1012
1013         for (plp = protolist; plp != NULL; plp = plp_next) {
1014                 plp_next = plp->next;
1015                 free(plp->name);
1016                 free(plp);
1017         }
1018         protolist = (struct valuelist *)0;
1019 }
1020
1021 static int
1022 findservice(const char *s, struct valuelist **list) {
1023         struct valuelist *lp = *list;
1024         int n;
1025
1026         for (; lp != NULL; lp = lp->next)
1027                 if (strcasecmp(lp->name, s) == 0) {
1028                         if (lp != *list) {
1029                                 lp->prev->next = lp->next;
1030                                 if (lp->next)
1031                                         lp->next->prev = lp->prev;
1032                                 (*list)->prev = lp;
1033                                 lp->next = *list;
1034                                 *list = lp;
1035                         }
1036                         return (lp->port);      /* host byte order */
1037                 }
1038         if (sscanf(s, "%d", &n) != 1 || n <= 0)
1039                 n = -1;
1040         return (n);
1041 }
1042
1043 /*
1044  * Convert service name or (ascii) number to int.
1045  */
1046 int
1047 res_servicenumber(const char *p) {
1048         if (servicelist == (struct valuelist *)0)
1049                 res_buildservicelist();
1050         return (findservice(p, &servicelist));
1051 }
1052
1053 /*
1054  * Convert protocol name or (ascii) number to int.
1055  */
1056 int
1057 res_protocolnumber(const char *p) {
1058         if (protolist == (struct valuelist *)0)
1059                 res_buildprotolist();
1060         return (findservice(p, &protolist));
1061 }
1062
1063 static struct servent *
1064 cgetservbyport(unsigned port, const char *proto) {      /* Host byte order. */
1065         struct valuelist **list = &servicelist;
1066         struct valuelist *lp = *list;
1067         static struct servent serv;
1068
1069         port = ntohs(port);
1070         for (; lp != NULL; lp = lp->next) {
1071                 if (port != (u_int16_t)lp->port)        /* Host byte order. */
1072                         continue;
1073                 if (strcasecmp(lp->proto, proto) == 0) {
1074                         if (lp != *list) {
1075                                 lp->prev->next = lp->next;
1076                                 if (lp->next)
1077                                         lp->next->prev = lp->prev;
1078                                 (*list)->prev = lp;
1079                                 lp->next = *list;
1080                                 *list = lp;
1081                         }
1082                         serv.s_name = lp->name;
1083                         serv.s_port = htons((u_int16_t)lp->port);
1084                         serv.s_proto = lp->proto;
1085                         return (&serv);
1086                 }
1087         }
1088         return (0);
1089 }
1090
1091 static struct protoent *
1092 cgetprotobynumber(int proto) {                          /* Host byte order. */
1093         struct valuelist **list = &protolist;
1094         struct valuelist *lp = *list;
1095         static struct protoent prot;
1096
1097         for (; lp != NULL; lp = lp->next)
1098                 if (lp->port == proto) {                /* Host byte order. */
1099                         if (lp != *list) {
1100                                 lp->prev->next = lp->next;
1101                                 if (lp->next)
1102                                         lp->next->prev = lp->prev;
1103                                 (*list)->prev = lp;
1104                                 lp->next = *list;
1105                                 *list = lp;
1106                         }
1107                         prot.p_name = lp->name;
1108                         prot.p_proto = lp->port;        /* Host byte order. */
1109                         return (&prot);
1110                 }
1111         return (0);
1112 }
1113
1114 const char *
1115 res_protocolname(int num) {
1116         static char number[8];
1117         struct protoent *pp;
1118
1119         if (protolist == (struct valuelist *)0)
1120                 res_buildprotolist();
1121         pp = cgetprotobynumber(num);
1122         if (pp == 0)  {
1123                 (void) sprintf(number, "%d", num);
1124                 return (number);
1125         }
1126         return (pp->p_name);
1127 }
1128
1129 const char *
1130 res_servicename(u_int16_t port, const char *proto) {    /* Host byte order. */
1131         static char number[8];
1132         struct servent *ss;
1133
1134         if (servicelist == (struct valuelist *)0)
1135                 res_buildservicelist();
1136         ss = cgetservbyport(htons(port), proto);
1137         if (ss == 0)  {
1138                 (void) sprintf(number, "%d", port);
1139                 return (number);
1140         }
1141         return (ss->s_name);
1142 }