contrib/bind9/lib/dns/masterdump.c

   1 /*
   2  * Copyright (C) 2004-2009, 2011  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1999-2003  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or 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 WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: masterdump.c,v 1.99.258.7 2011-06-08 23:02:42 each Exp $ */
  19
  20 /*! \file */
  21
  22 #include <config.h>
  23
  24 #include <stdlib.h>
  25
  26 #include <isc/event.h>
  27 #include <isc/file.h>
  28 #include <isc/magic.h>
  29 #include <isc/mem.h>
  30 #include <isc/print.h>
  31 #include <isc/stdio.h>
  32 #include <isc/string.h>
  33 #include <isc/task.h>
  34 #include <isc/time.h>
  35 #include <isc/util.h>
  36
  37 #include <dns/db.h>
  38 #include <dns/dbiterator.h>
  39 #include <dns/events.h>
  40 #include <dns/fixedname.h>
  41 #include <dns/lib.h>
  42 #include <dns/log.h>
  43 #include <dns/master.h>
  44 #include <dns/masterdump.h>
  45 #include <dns/ncache.h>
  46 #include <dns/rdata.h>
  47 #include <dns/rdataclass.h>
  48 #include <dns/rdataset.h>
  49 #include <dns/rdatasetiter.h>
  50 #include <dns/rdatatype.h>
  51 #include <dns/result.h>
  52 #include <dns/time.h>
  53 #include <dns/ttl.h>
  54
  55 #define DNS_DCTX_MAGIC          ISC_MAGIC('D', 'c', 't', 'x')
  56 #define DNS_DCTX_VALID(d)       ISC_MAGIC_VALID(d, DNS_DCTX_MAGIC)
  57
  58 #define RETERR(x) do { \
  59         isc_result_t _r = (x); \
  60         if (_r != ISC_R_SUCCESS) \
  61                 return (_r); \
  62         } while (0)
  63
  64 #define CHECK(x) do { \
  65         if ((x) != ISC_R_SUCCESS) \
  66                 goto cleanup; \
  67         } while (0)
  68
  69 struct dns_master_style {
  70         unsigned int flags;             /* DNS_STYLEFLAG_* */
  71         unsigned int ttl_column;
  72         unsigned int class_column;
  73         unsigned int type_column;
  74         unsigned int rdata_column;
  75         unsigned int line_length;
  76         unsigned int tab_width;
  77 };
  78
  79 /*%
  80  * The maximum length of the newline+indentation that is output
  81  * when inserting a line break in an RR.  This effectively puts an
  82  * upper limits on the value of "rdata_column", because if it is
  83  * very large, the tabs and spaces needed to reach it will not fit.
  84  */
  85 #define DNS_TOTEXT_LINEBREAK_MAXLEN 100
  86
  87 /*%
  88  * Context structure for a masterfile dump in progress.
  89  */
  90 typedef struct dns_totext_ctx {
  91         dns_master_style_t      style;
  92         isc_boolean_t           class_printed;
  93         char *                  linebreak;
  94         char                    linebreak_buf[DNS_TOTEXT_LINEBREAK_MAXLEN];
  95         dns_name_t *            origin;
  96         dns_name_t *            neworigin;
  97         dns_fixedname_t         origin_fixname;
  98         isc_uint32_t            current_ttl;
  99         isc_boolean_t           current_ttl_valid;
 100 } dns_totext_ctx_t;
 101
 102 LIBDNS_EXTERNAL_DATA const dns_master_style_t
 103 dns_master_style_default = {
 104         DNS_STYLEFLAG_OMIT_OWNER |
 105         DNS_STYLEFLAG_OMIT_CLASS |
 106         DNS_STYLEFLAG_REL_OWNER |
 107         DNS_STYLEFLAG_REL_DATA |
 108         DNS_STYLEFLAG_OMIT_TTL |
 109         DNS_STYLEFLAG_TTL |
 110         DNS_STYLEFLAG_COMMENT |
 111         DNS_STYLEFLAG_MULTILINE,
 112         24, 24, 24, 32, 80, 8
 113 };
 114
 115 LIBDNS_EXTERNAL_DATA const dns_master_style_t
 116 dns_master_style_full = {
 117         DNS_STYLEFLAG_COMMENT |
 118         DNS_STYLEFLAG_RESIGN,
 119         46, 46, 46, 64, 120, 8
 120 };
 121
 122 LIBDNS_EXTERNAL_DATA const dns_master_style_t
 123 dns_master_style_explicitttl = {
 124         DNS_STYLEFLAG_OMIT_OWNER |
 125         DNS_STYLEFLAG_OMIT_CLASS |
 126         DNS_STYLEFLAG_REL_OWNER |
 127         DNS_STYLEFLAG_REL_DATA |
 128         DNS_STYLEFLAG_COMMENT |
 129         DNS_STYLEFLAG_MULTILINE,
 130         24, 32, 32, 40, 80, 8
 131 };
 132
 133 LIBDNS_EXTERNAL_DATA const dns_master_style_t
 134 dns_master_style_cache = {
 135         DNS_STYLEFLAG_OMIT_OWNER |
 136         DNS_STYLEFLAG_OMIT_CLASS |
 137         DNS_STYLEFLAG_MULTILINE |
 138         DNS_STYLEFLAG_TRUST |
 139         DNS_STYLEFLAG_NCACHE,
 140         24, 32, 32, 40, 80, 8
 141 };
 142
 143 LIBDNS_EXTERNAL_DATA const dns_master_style_t
 144 dns_master_style_simple = {
 145         0,
 146         24, 32, 32, 40, 80, 8
 147 };
 148
 149 /*%
 150  * A style suitable for dns_rdataset_totext().
 151  */
 152 LIBDNS_EXTERNAL_DATA const dns_master_style_t
 153 dns_master_style_debug = {
 154         DNS_STYLEFLAG_REL_OWNER,
 155         24, 32, 40, 48, 80, 8
 156 };
 157
 158
 159 #define N_SPACES 10
 160 static char spaces[N_SPACES+1] = "          ";
 161
 162 #define N_TABS 10
 163 static char tabs[N_TABS+1] = "\t\t\t\t\t\t\t\t\t\t";
 164
 165 #ifdef BIND9
 166 struct dns_dumpctx {
 167         unsigned int            magic;
 168         isc_mem_t               *mctx;
 169         isc_mutex_t             lock;
 170         unsigned int            references;
 171         isc_boolean_t           canceled;
 172         isc_boolean_t           first;
 173         isc_boolean_t           do_date;
 174         isc_stdtime_t           now;
 175         FILE                    *f;
 176         dns_db_t                *db;
 177         dns_dbversion_t         *version;
 178         dns_dbiterator_t        *dbiter;
 179         dns_totext_ctx_t        tctx;
 180         isc_task_t              *task;
 181         dns_dumpdonefunc_t      done;
 182         void                    *done_arg;
 183         unsigned int            nodes;
 184         /* dns_master_dumpinc() */
 185         char                    *file;
 186         char                    *tmpfile;
 187         dns_masterformat_t      format;
 188         isc_result_t            (*dumpsets)(isc_mem_t *mctx, dns_name_t *name,
 189                                             dns_rdatasetiter_t *rdsiter,
 190                                             dns_totext_ctx_t *ctx,
 191                                             isc_buffer_t *buffer, FILE *f);
 192 };
 193 #endif /* BIND9 */
 194
 195 #define NXDOMAIN(x) (((x)->attributes & DNS_RDATASETATTR_NXDOMAIN) != 0)
 196
 197 /*%
 198  * Output tabs and spaces to go from column '*current' to
 199  * column 'to', and update '*current' to reflect the new
 200  * current column.
 201  */
 202 static isc_result_t
 203 indent(unsigned int *current, unsigned int to, int tabwidth,
 204        isc_buffer_t *target)
 205 {
 206         isc_region_t r;
 207         unsigned char *p;
 208         unsigned int from;
 209         int ntabs, nspaces, t;
 210
 211         from = *current;
 212
 213         if (to < from + 1)
 214                 to = from + 1;
 215
 216         ntabs = to / tabwidth - from / tabwidth;
 217         if (ntabs < 0)
 218                 ntabs = 0;
 219
 220         if (ntabs > 0) {
 221                 isc_buffer_availableregion(target, &r);
 222                 if (r.length < (unsigned) ntabs)
 223                         return (ISC_R_NOSPACE);
 224                 p = r.base;
 225
 226                 t = ntabs;
 227                 while (t) {
 228                         int n = t;
 229                         if (n > N_TABS)
 230                                 n = N_TABS;
 231                         memcpy(p, tabs, n);
 232                         p += n;
 233                         t -= n;
 234                 }
 235                 isc_buffer_add(target, ntabs);
 236                 from = (to / tabwidth) * tabwidth;
 237         }
 238
 239         nspaces = to - from;
 240         INSIST(nspaces >= 0);
 241
 242         isc_buffer_availableregion(target, &r);
 243         if (r.length < (unsigned) nspaces)
 244                 return (ISC_R_NOSPACE);
 245         p = r.base;
 246
 247         t = nspaces;
 248         while (t) {
 249                 int n = t;
 250                 if (n > N_SPACES)
 251                         n = N_SPACES;
 252                 memcpy(p, spaces, n);
 253                 p += n;
 254                 t -= n;
 255         }
 256         isc_buffer_add(target, nspaces);
 257
 258         *current = to;
 259         return (ISC_R_SUCCESS);
 260 }
 261
 262 static isc_result_t
 263 totext_ctx_init(const dns_master_style_t *style, dns_totext_ctx_t *ctx) {
 264         isc_result_t result;
 265
 266         REQUIRE(style->tab_width != 0);
 267
 268         ctx->style = *style;
 269         ctx->class_printed = ISC_FALSE;
 270
 271         dns_fixedname_init(&ctx->origin_fixname);
 272
 273         /*
 274          * Set up the line break string if needed.
 275          */
 276         if ((ctx->style.flags & DNS_STYLEFLAG_MULTILINE) != 0) {
 277                 isc_buffer_t buf;
 278                 isc_region_t r;
 279                 unsigned int col = 0;
 280
 281                 isc_buffer_init(&buf, ctx->linebreak_buf,
 282                                 sizeof(ctx->linebreak_buf));
 283
 284                 isc_buffer_availableregion(&buf, &r);
 285                 if (r.length < 1)
 286                         return (DNS_R_TEXTTOOLONG);
 287                 r.base[0] = '\n';
 288                 isc_buffer_add(&buf, 1);
 289
 290                 result = indent(&col, ctx->style.rdata_column,
 291                                 ctx->style.tab_width, &buf);
 292                 /*
 293                  * Do not return ISC_R_NOSPACE if the line break string
 294                  * buffer is too small, because that would just make
 295                  * dump_rdataset() retry indefinitely with ever
 296                  * bigger target buffers.  That's a different buffer,
 297                  * so it won't help.  Use DNS_R_TEXTTOOLONG as a substitute.
 298                  */
 299                 if (result == ISC_R_NOSPACE)
 300                         return (DNS_R_TEXTTOOLONG);
 301                 if (result != ISC_R_SUCCESS)
 302                         return (result);
 303
 304                 isc_buffer_availableregion(&buf, &r);
 305                 if (r.length < 1)
 306                         return (DNS_R_TEXTTOOLONG);
 307                 r.base[0] = '\0';
 308                 isc_buffer_add(&buf, 1);
 309                 ctx->linebreak = ctx->linebreak_buf;
 310         } else {
 311                 ctx->linebreak = NULL;
 312         }
 313
 314         ctx->origin = NULL;
 315         ctx->neworigin = NULL;
 316         ctx->current_ttl = 0;
 317         ctx->current_ttl_valid = ISC_FALSE;
 318
 319         return (ISC_R_SUCCESS);
 320 }
 321
 322 #define INDENT_TO(col) \
 323         do { \
 324                  if ((result = indent(&column, ctx->style.col, \
 325                                       ctx->style.tab_width, target)) \
 326                      != ISC_R_SUCCESS) \
 327                             return (result); \
 328         } while (0)
 329
 330
 331 static isc_result_t
 332 str_totext(const char *source, isc_buffer_t *target) {
 333         unsigned int l;
 334         isc_region_t region;
 335
 336         isc_buffer_availableregion(target, &region);
 337         l = strlen(source);
 338
 339         if (l > region.length)
 340                 return (ISC_R_NOSPACE);
 341
 342         memcpy(region.base, source, l);
 343         isc_buffer_add(target, l);
 344         return (ISC_R_SUCCESS);
 345 }
 346
 347 static isc_result_t
 348 ncache_summary(dns_rdataset_t *rdataset, isc_boolean_t omit_final_dot,
 349                isc_buffer_t *target)
 350 {
 351         isc_result_t result = ISC_R_SUCCESS;
 352         dns_rdataset_t rds;
 353         dns_name_t name;
 354
 355         dns_rdataset_init(&rds);
 356         dns_name_init(&name, NULL);
 357
 358         do {
 359                 dns_ncache_current(rdataset, &name, &rds);
 360                 for (result = dns_rdataset_first(&rds);
 361                      result == ISC_R_SUCCESS;
 362                      result = dns_rdataset_next(&rds)) {
 363                         CHECK(str_totext("; ", target));
 364                         CHECK(dns_name_totext(&name, omit_final_dot, target));
 365                         CHECK(str_totext(" ", target));
 366                         CHECK(dns_rdatatype_totext(rds.type, target));
 367                         if (rds.type == dns_rdatatype_rrsig) {
 368                                 CHECK(str_totext(" ", target));
 369                                 CHECK(dns_rdatatype_totext(rds.covers, target));
 370                                 CHECK(str_totext(" ...\n", target));
 371                         } else {
 372                                 dns_rdata_t rdata = DNS_RDATA_INIT;
 373                                 dns_rdataset_current(&rds, &rdata);
 374                                 CHECK(str_totext(" ", target));
 375                                 CHECK(dns_rdata_tofmttext(&rdata, dns_rootname,
 376                                                           0, 0, " ", target));
 377                                 CHECK(str_totext("\n", target));
 378                         }
 379                 }
 380                 dns_rdataset_disassociate(&rds);
 381                 result = dns_rdataset_next(rdataset);
 382         } while (result == ISC_R_SUCCESS);
 383
 384         if (result == ISC_R_NOMORE)
 385                 result = ISC_R_SUCCESS;
 386  cleanup:
 387         if (dns_rdataset_isassociated(&rds))
 388                 dns_rdataset_disassociate(&rds);
 389
 390         return (result);
 391 }
 392
 393 /*
 394  * Convert 'rdataset' to master file text format according to 'ctx',
 395  * storing the result in 'target'.  If 'owner_name' is NULL, it
 396  * is omitted; otherwise 'owner_name' must be valid and have at least
 397  * one label.
 398  */
 399
 400 static isc_result_t
 401 rdataset_totext(dns_rdataset_t *rdataset,
 402                 dns_name_t *owner_name,
 403                 dns_totext_ctx_t *ctx,
 404                 isc_boolean_t omit_final_dot,
 405                 isc_buffer_t *target)
 406 {
 407         isc_result_t result;
 408         unsigned int column;
 409         isc_boolean_t first = ISC_TRUE;
 410         isc_uint32_t current_ttl;
 411         isc_boolean_t current_ttl_valid;
 412         dns_rdatatype_t type;
 413         unsigned int type_start;
 414
 415         REQUIRE(DNS_RDATASET_VALID(rdataset));
 416
 417         rdataset->attributes |= DNS_RDATASETATTR_LOADORDER;
 418         result = dns_rdataset_first(rdataset);
 419         REQUIRE(result == ISC_R_SUCCESS);
 420
 421         current_ttl = ctx->current_ttl;
 422         current_ttl_valid = ctx->current_ttl_valid;
 423
 424         do {
 425                 column = 0;
 426
 427                 /*
 428                  * Owner name.
 429                  */
 430                 if (owner_name != NULL &&
 431                     ! ((ctx->style.flags & DNS_STYLEFLAG_OMIT_OWNER) != 0 &&
 432                        !first))
 433                 {
 434                         unsigned int name_start = target->used;
 435                         RETERR(dns_name_totext(owner_name,
 436                                                omit_final_dot,
 437                                                target));
 438                         column += target->used - name_start;
 439                 }
 440
 441                 /*
 442                  * TTL.
 443                  */
 444                 if ((ctx->style.flags & DNS_STYLEFLAG_NO_TTL) == 0 &&
 445                     !((ctx->style.flags & DNS_STYLEFLAG_OMIT_TTL) != 0 &&
 446                       current_ttl_valid &&
 447                       rdataset->ttl == current_ttl))
 448                 {
 449                         char ttlbuf[64];
 450                         isc_region_t r;
 451                         unsigned int length;
 452
 453                         INDENT_TO(ttl_column);
 454                         length = snprintf(ttlbuf, sizeof(ttlbuf), "%u",
 455                                           rdataset->ttl);
 456                         INSIST(length <= sizeof(ttlbuf));
 457                         isc_buffer_availableregion(target, &r);
 458                         if (r.length < length)
 459                                 return (ISC_R_NOSPACE);
 460                         memcpy(r.base, ttlbuf, length);
 461                         isc_buffer_add(target, length);
 462                         column += length;
 463
 464                         /*
 465                          * If the $TTL directive is not in use, the TTL we
 466                          * just printed becomes the default for subsequent RRs.
 467                          */
 468                         if ((ctx->style.flags & DNS_STYLEFLAG_TTL) == 0) {
 469                                 current_ttl = rdataset->ttl;
 470                                 current_ttl_valid = ISC_TRUE;
 471                         }
 472                 }
 473
 474                 /*
 475                  * Class.
 476                  */
 477                 if ((ctx->style.flags & DNS_STYLEFLAG_NO_CLASS) == 0 &&
 478                     ((ctx->style.flags & DNS_STYLEFLAG_OMIT_CLASS) == 0 ||
 479                      ctx->class_printed == ISC_FALSE))
 480                 {
 481                         unsigned int class_start;
 482                         INDENT_TO(class_column);
 483                         class_start = target->used;
 484                         result = dns_rdataclass_totext(rdataset->rdclass,
 485                                                        target);
 486                         if (result != ISC_R_SUCCESS)
 487                                 return (result);
 488                         column += (target->used - class_start);
 489                 }
 490
 491                 /*
 492                  * Type.
 493                  */
 494
 495                 if ((rdataset->attributes & DNS_RDATASETATTR_NEGATIVE) != 0) {
 496                         type = rdataset->covers;
 497                 } else {
 498                         type = rdataset->type;
 499                 }
 500
 501                 INDENT_TO(type_column);
 502                 type_start = target->used;
 503                 if ((rdataset->attributes & DNS_RDATASETATTR_NEGATIVE) != 0)
 504                         RETERR(str_totext("\\-", target));
 505                 result = dns_rdatatype_totext(type, target);
 506                 if (result != ISC_R_SUCCESS)
 507                         return (result);
 508                 column += (target->used - type_start);
 509
 510                 /*
 511                  * Rdata.
 512                  */
 513                 INDENT_TO(rdata_column);
 514                 if ((rdataset->attributes & DNS_RDATASETATTR_NEGATIVE) != 0) {
 515                         if (NXDOMAIN(rdataset))
 516                                 RETERR(str_totext(";-$NXDOMAIN\n", target));
 517                         else
 518                                 RETERR(str_totext(";-$NXRRSET\n", target));
 519                         /*
 520                          * Print a summary of the cached records which make
 521                          * up the negative response.
 522                          */
 523                         RETERR(ncache_summary(rdataset, omit_final_dot,
 524                                               target));
 525                         break;
 526                 } else {
 527                         dns_rdata_t rdata = DNS_RDATA_INIT;
 528                         isc_region_t r;
 529
 530                         dns_rdataset_current(rdataset, &rdata);
 531
 532                         RETERR(dns_rdata_tofmttext(&rdata,
 533                                                    ctx->origin,
 534                                                    ctx->style.flags,
 535                                                    ctx->style.line_length -
 536                                                        ctx->style.rdata_column,
 537                                                    ctx->linebreak,
 538                                                    target));
 539
 540                         isc_buffer_availableregion(target, &r);
 541                         if (r.length < 1)
 542                                 return (ISC_R_NOSPACE);
 543                         r.base[0] = '\n';
 544                         isc_buffer_add(target, 1);
 545                 }
 546
 547                 first = ISC_FALSE;
 548                 result = dns_rdataset_next(rdataset);
 549         } while (result == ISC_R_SUCCESS);
 550
 551         if (result != ISC_R_NOMORE)
 552                 return (result);
 553
 554         /*
 555          * Update the ctx state to reflect what we just printed.
 556          * This is done last, only when we are sure we will return
 557          * success, because this function may be called multiple
 558          * times with increasing buffer sizes until it succeeds,
 559          * and failed attempts must not update the state prematurely.
 560          */
 561         ctx->class_printed = ISC_TRUE;
 562         ctx->current_ttl= current_ttl;
 563         ctx->current_ttl_valid = current_ttl_valid;
 564
 565         return (ISC_R_SUCCESS);
 566 }
 567
 568 /*
 569  * Print the name, type, and class of an empty rdataset,
 570  * such as those used to represent the question section
 571  * of a DNS message.
 572  */
 573 static isc_result_t
 574 question_totext(dns_rdataset_t *rdataset,
 575                 dns_name_t *owner_name,
 576                 dns_totext_ctx_t *ctx,
 577                 isc_boolean_t omit_final_dot,
 578                 isc_buffer_t *target)
 579 {
 580         unsigned int column;
 581         isc_result_t result;
 582         isc_region_t r;
 583
 584         REQUIRE(DNS_RDATASET_VALID(rdataset));
 585         result = dns_rdataset_first(rdataset);
 586         REQUIRE(result == ISC_R_NOMORE);
 587
 588         column = 0;
 589
 590         /* Owner name */
 591         {
 592                 unsigned int name_start = target->used;
 593                 RETERR(dns_name_totext(owner_name,
 594                                        omit_final_dot,
 595                                        target));
 596                 column += target->used - name_start;
 597         }
 598
 599         /* Class */
 600         {
 601                 unsigned int class_start;
 602                 INDENT_TO(class_column);
 603                 class_start = target->used;
 604                 result = dns_rdataclass_totext(rdataset->rdclass, target);
 605                 if (result != ISC_R_SUCCESS)
 606                         return (result);
 607                 column += (target->used - class_start);
 608         }
 609
 610         /* Type */
 611         {
 612                 unsigned int type_start;
 613                 INDENT_TO(type_column);
 614                 type_start = target->used;
 615                 result = dns_rdatatype_totext(rdataset->type, target);
 616                 if (result != ISC_R_SUCCESS)
 617                         return (result);
 618                 column += (target->used - type_start);
 619         }
 620
 621         isc_buffer_availableregion(target, &r);
 622         if (r.length < 1)
 623                 return (ISC_R_NOSPACE);
 624         r.base[0] = '\n';
 625         isc_buffer_add(target, 1);
 626
 627         return (ISC_R_SUCCESS);
 628 }
 629
 630 isc_result_t
 631 dns_rdataset_totext(dns_rdataset_t *rdataset,
 632                     dns_name_t *owner_name,
 633                     isc_boolean_t omit_final_dot,
 634                     isc_boolean_t question,
 635                     isc_buffer_t *target)
 636 {
 637         dns_totext_ctx_t ctx;
 638         isc_result_t result;
 639         result = totext_ctx_init(&dns_master_style_debug, &ctx);
 640         if (result != ISC_R_SUCCESS) {
 641                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 642                                  "could not set master file style");
 643                 return (ISC_R_UNEXPECTED);
 644         }
 645
 646         /*
 647          * The caller might want to give us an empty owner
 648          * name (e.g. if they are outputting into a master
 649          * file and this rdataset has the same name as the
 650          * previous one.)
 651          */
 652         if (dns_name_countlabels(owner_name) == 0)
 653                 owner_name = NULL;
 654
 655         if (question)
 656                 return (question_totext(rdataset, owner_name, &ctx,
 657                                         omit_final_dot, target));
 658         else
 659                 return (rdataset_totext(rdataset, owner_name, &ctx,
 660                                         omit_final_dot, target));
 661 }
 662
 663 isc_result_t
 664 dns_master_rdatasettotext(dns_name_t *owner_name,
 665                           dns_rdataset_t *rdataset,
 666                           const dns_master_style_t *style,
 667                           isc_buffer_t *target)
 668 {
 669         dns_totext_ctx_t ctx;
 670         isc_result_t result;
 671         result = totext_ctx_init(style, &ctx);
 672         if (result != ISC_R_SUCCESS) {
 673                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 674                                  "could not set master file style");
 675                 return (ISC_R_UNEXPECTED);
 676         }
 677
 678         return (rdataset_totext(rdataset, owner_name, &ctx,
 679                                 ISC_FALSE, target));
 680 }
 681
 682 isc_result_t
 683 dns_master_questiontotext(dns_name_t *owner_name,
 684                           dns_rdataset_t *rdataset,
 685                           const dns_master_style_t *style,
 686                           isc_buffer_t *target)
 687 {
 688         dns_totext_ctx_t ctx;
 689         isc_result_t result;
 690         result = totext_ctx_init(style, &ctx);
 691         if (result != ISC_R_SUCCESS) {
 692                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 693                                  "could not set master file style");
 694                 return (ISC_R_UNEXPECTED);
 695         }
 696
 697         return (question_totext(rdataset, owner_name, &ctx,
 698                                 ISC_FALSE, target));
 699 }
 700
 701 #ifdef BIND9
 702 /*
 703  * Print an rdataset.  'buffer' is a scratch buffer, which must have been
 704  * dynamically allocated by the caller.  It must be large enough to
 705  * hold the result from dns_ttl_totext().  If more than that is needed,
 706  * the buffer will be grown automatically.
 707  */
 708
 709 static isc_result_t
 710 dump_rdataset(isc_mem_t *mctx, dns_name_t *name, dns_rdataset_t *rdataset,
 711               dns_totext_ctx_t *ctx,
 712               isc_buffer_t *buffer, FILE *f)
 713 {
 714         isc_region_t r;
 715         isc_result_t result;
 716
 717         REQUIRE(buffer->length > 0);
 718
 719         /*
 720          * Output a $TTL directive if needed.
 721          */
 722
 723         if ((ctx->style.flags & DNS_STYLEFLAG_TTL) != 0) {
 724                 if (ctx->current_ttl_valid == ISC_FALSE ||
 725                     ctx->current_ttl != rdataset->ttl)
 726                 {
 727                         if ((ctx->style.flags & DNS_STYLEFLAG_COMMENT) != 0)
 728                         {
 729                                 isc_buffer_clear(buffer);
 730                                 result = dns_ttl_totext(rdataset->ttl,
 731                                                         ISC_TRUE, buffer);
 732                                 INSIST(result == ISC_R_SUCCESS);
 733                                 isc_buffer_usedregion(buffer, &r);
 734                                 fprintf(f, "$TTL %u\t; %.*s\n", rdataset->ttl,
 735                                         (int) r.length, (char *) r.base);
 736                         } else {
 737                                 fprintf(f, "$TTL %u\n", rdataset->ttl);
 738                         }
 739                         ctx->current_ttl = rdataset->ttl;
 740                         ctx->current_ttl_valid = ISC_TRUE;
 741                 }
 742         }
 743
 744         isc_buffer_clear(buffer);
 745
 746         /*
 747          * Generate the text representation of the rdataset into
 748          * the buffer.  If the buffer is too small, grow it.
 749          */
 750         for (;;) {
 751                 int newlength;
 752                 void *newmem;
 753                 result = rdataset_totext(rdataset, name, ctx,
 754                                          ISC_FALSE, buffer);
 755                 if (result != ISC_R_NOSPACE)
 756                         break;
 757
 758                 newlength = buffer->length * 2;
 759                 newmem = isc_mem_get(mctx, newlength);
 760                 if (newmem == NULL)
 761                         return (ISC_R_NOMEMORY);
 762                 isc_mem_put(mctx, buffer->base, buffer->length);
 763                 isc_buffer_init(buffer, newmem, newlength);
 764         }
 765         if (result != ISC_R_SUCCESS)
 766                 return (result);
 767
 768         /*
 769          * Write the buffer contents to the master file.
 770          */
 771         isc_buffer_usedregion(buffer, &r);
 772         result = isc_stdio_write(r.base, 1, (size_t)r.length, f, NULL);
 773
 774         if (result != ISC_R_SUCCESS) {
 775                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 776                                  "master file write failed: %s",
 777                                  isc_result_totext(result));
 778                 return (result);
 779         }
 780
 781         return (ISC_R_SUCCESS);
 782 }
 783
 784 /*
 785  * Define the order in which rdatasets should be printed in zone
 786  * files.  We will print SOA and NS records before others, SIGs
 787  * immediately following the things they sign, and order everything
 788  * else by RR number.  This is all just for aesthetics and
 789  * compatibility with buggy software that expects the SOA to be first;
 790  * the DNS specifications allow any order.
 791  */
 792
 793 static int
 794 dump_order(const dns_rdataset_t *rds) {
 795         int t;
 796         int sig;
 797         if (rds->type == dns_rdatatype_rrsig) {
 798                 t = rds->covers;
 799                 sig = 1;
 800         } else {
 801                 t = rds->type;
 802                 sig = 0;
 803         }
 804         switch (t) {
 805         case dns_rdatatype_soa:
 806                 t = 0;
 807                 break;
 808         case dns_rdatatype_ns:
 809                 t = 1;
 810                 break;
 811         default:
 812                 t += 2;
 813                 break;
 814         }
 815         return (t << 1) + sig;
 816 }
 817
 818 static int
 819 dump_order_compare(const void *a, const void *b) {
 820         return (dump_order(*((const dns_rdataset_t * const *) a)) -
 821                 dump_order(*((const dns_rdataset_t * const *) b)));
 822 }
 823
 824 /*
 825  * Dump all the rdatasets of a domain name to a master file.  We make
 826  * a "best effort" attempt to sort the RRsets in a nice order, but if
 827  * there are more than MAXSORT RRsets, we punt and only sort them in
 828  * groups of MAXSORT.  This is not expected to ever happen in practice
 829  * since much less than 64 RR types have been registered with the
 830  * IANA, so far, and the output will be correct (though not
 831  * aesthetically pleasing) even if it does happen.
 832  */
 833
 834 #define MAXSORT 64
 835
 836 static isc_result_t
 837 dump_rdatasets_text(isc_mem_t *mctx, dns_name_t *name,
 838                     dns_rdatasetiter_t *rdsiter, dns_totext_ctx_t *ctx,
 839                     isc_buffer_t *buffer, FILE *f)
 840 {
 841         isc_result_t itresult, dumpresult;
 842         isc_region_t r;
 843         dns_rdataset_t rdatasets[MAXSORT];
 844         dns_rdataset_t *sorted[MAXSORT];
 845         int i, n;
 846
 847         itresult = dns_rdatasetiter_first(rdsiter);
 848         dumpresult = ISC_R_SUCCESS;
 849
 850         if (itresult == ISC_R_SUCCESS && ctx->neworigin != NULL) {
 851                 isc_buffer_clear(buffer);
 852                 itresult = dns_name_totext(ctx->neworigin, ISC_FALSE, buffer);
 853                 RUNTIME_CHECK(itresult == ISC_R_SUCCESS);
 854                 isc_buffer_usedregion(buffer, &r);
 855                 fprintf(f, "$ORIGIN %.*s\n", (int) r.length, (char *) r.base);
 856                 ctx->neworigin = NULL;
 857         }
 858
 859  again:
 860         for (i = 0;
 861              itresult == ISC_R_SUCCESS && i < MAXSORT;
 862              itresult = dns_rdatasetiter_next(rdsiter), i++) {
 863                 dns_rdataset_init(&rdatasets[i]);
 864                 dns_rdatasetiter_current(rdsiter, &rdatasets[i]);
 865                 sorted[i] = &rdatasets[i];
 866         }
 867         n = i;
 868         INSIST(n <= MAXSORT);
 869
 870         qsort(sorted, n, sizeof(sorted[0]), dump_order_compare);
 871
 872         for (i = 0; i < n; i++) {
 873                 dns_rdataset_t *rds = sorted[i];
 874                 if (ctx->style.flags & DNS_STYLEFLAG_TRUST)
 875                         fprintf(f, "; %s\n", dns_trust_totext(rds->trust));
 876                 if (((rds->attributes & DNS_RDATASETATTR_NEGATIVE) != 0) &&
 877                     (ctx->style.flags & DNS_STYLEFLAG_NCACHE) == 0) {
 878                         /* Omit negative cache entries */
 879                 } else {
 880                         isc_result_t result =
 881                                 dump_rdataset(mctx, name, rds, ctx,
 882                                                buffer, f);
 883                         if (result != ISC_R_SUCCESS)
 884                                 dumpresult = result;
 885                         if ((ctx->style.flags & DNS_STYLEFLAG_OMIT_OWNER) != 0)
 886                                 name = NULL;
 887                 }
 888                 if (ctx->style.flags & DNS_STYLEFLAG_RESIGN &&
 889                     rds->attributes & DNS_RDATASETATTR_RESIGN) {
 890                         isc_buffer_t b;
 891                         char buf[sizeof("YYYYMMDDHHMMSS")];
 892                         memset(buf, 0, sizeof(buf));
 893                         isc_buffer_init(&b, buf, sizeof(buf) - 1);
 894                         dns_time64_totext((isc_uint64_t)rds->resign, &b);
 895                         fprintf(f, "; resign=%s\n", buf);
 896                 }
 897                 dns_rdataset_disassociate(rds);
 898         }
 899
 900         if (dumpresult != ISC_R_SUCCESS)
 901                 return (dumpresult);
 902
 903         /*
 904          * If we got more data than could be sorted at once,
 905          * go handle the rest.
 906          */
 907         if (itresult == ISC_R_SUCCESS)
 908                 goto again;
 909
 910         if (itresult == ISC_R_NOMORE)
 911                 itresult = ISC_R_SUCCESS;
 912
 913         return (itresult);
 914 }
 915
 916 /*
 917  * Dump given RRsets in the "raw" format.
 918  */
 919 static isc_result_t
 920 dump_rdataset_raw(isc_mem_t *mctx, dns_name_t *name, dns_rdataset_t *rdataset,
 921                   isc_buffer_t *buffer, FILE *f)
 922 {
 923         isc_result_t result;
 924         isc_uint32_t totallen;
 925         isc_uint16_t dlen;
 926         isc_region_t r, r_hdr;
 927
 928         REQUIRE(buffer->length > 0);
 929         REQUIRE(DNS_RDATASET_VALID(rdataset));
 930
 931  restart:
 932         totallen = 0;
 933         result = dns_rdataset_first(rdataset);
 934         REQUIRE(result == ISC_R_SUCCESS);
 935
 936         isc_buffer_clear(buffer);
 937
 938         /*
 939          * Common header and owner name (length followed by name)
 940          * These fields should be in a moderate length, so we assume we
 941          * can store all of them in the initial buffer.
 942          */
 943         isc_buffer_availableregion(buffer, &r_hdr);
 944         INSIST(r_hdr.length >= sizeof(dns_masterrawrdataset_t));
 945         isc_buffer_putuint32(buffer, totallen); /* XXX: leave space */
 946         isc_buffer_putuint16(buffer, rdataset->rdclass); /* 16-bit class */
 947         isc_buffer_putuint16(buffer, rdataset->type); /* 16-bit type */
 948         isc_buffer_putuint16(buffer, rdataset->covers); /* same as type */
 949         isc_buffer_putuint32(buffer, rdataset->ttl); /* 32-bit TTL */
 950         isc_buffer_putuint32(buffer, dns_rdataset_count(rdataset));
 951         totallen = isc_buffer_usedlength(buffer);
 952         INSIST(totallen <= sizeof(dns_masterrawrdataset_t));
 953
 954         dns_name_toregion(name, &r);
 955         INSIST(isc_buffer_availablelength(buffer) >=
 956                (sizeof(dlen) + r.length));
 957         dlen = (isc_uint16_t)r.length;
 958         isc_buffer_putuint16(buffer, dlen);
 959         isc_buffer_copyregion(buffer, &r);
 960         totallen += sizeof(dlen) + r.length;
 961
 962         do {
 963                 dns_rdata_t rdata = DNS_RDATA_INIT;
 964                 isc_region_t r;
 965
 966                 dns_rdataset_current(rdataset, &rdata);
 967                 dns_rdata_toregion(&rdata, &r);
 968                 INSIST(r.length <= 0xffffU);
 969                 dlen = (isc_uint16_t)r.length;
 970
 971                 /*
 972                  * Copy the rdata into the buffer.  If the buffer is too small,
 973                  * grow it.  This should be rare, so we'll simply restart the
 974                  * entire procedure (or should we copy the old data and
 975                  * continue?).
 976                  */
 977                 if (isc_buffer_availablelength(buffer) <
 978                                                  sizeof(dlen) + r.length) {
 979                         int newlength;
 980                         void *newmem;
 981
 982                         newlength = buffer->length * 2;
 983                         newmem = isc_mem_get(mctx, newlength);
 984                         if (newmem == NULL)
 985                                 return (ISC_R_NOMEMORY);
 986                         isc_mem_put(mctx, buffer->base, buffer->length);
 987                         isc_buffer_init(buffer, newmem, newlength);
 988                         goto restart;
 989                 }
 990                 isc_buffer_putuint16(buffer, dlen);
 991                 isc_buffer_copyregion(buffer, &r);
 992                 totallen += sizeof(dlen) + r.length;
 993
 994                 result = dns_rdataset_next(rdataset);
 995         } while (result == ISC_R_SUCCESS);
 996
 997         if (result != ISC_R_NOMORE)
 998                 return (result);
 999
1000         /*
1001          * Fill in the total length field.
1002          * XXX: this is a bit tricky.  Since we have already "used" the space
1003          * for the total length in the buffer, we first remember the entire
1004          * buffer length in the region, "rewind", and then write the value.
1005          */
1006         isc_buffer_usedregion(buffer, &r);
1007         isc_buffer_clear(buffer);
1008         isc_buffer_putuint32(buffer, totallen);
1009         INSIST(isc_buffer_usedlength(buffer) < totallen);
1010
1011         /*
1012          * Write the buffer contents to the raw master file.
1013          */
1014         result = isc_stdio_write(r.base, 1, (size_t)r.length, f, NULL);
1015
1016         if (result != ISC_R_SUCCESS) {
1017                 UNEXPECTED_ERROR(__FILE__, __LINE__,
1018                                  "raw master file write failed: %s",
1019                                  isc_result_totext(result));
1020                 return (result);
1021         }
1022
1023         return (result);
1024 }
1025
1026 static isc_result_t
1027 dump_rdatasets_raw(isc_mem_t *mctx, dns_name_t *name,
1028                    dns_rdatasetiter_t *rdsiter, dns_totext_ctx_t *ctx,
1029                    isc_buffer_t *buffer, FILE *f)
1030 {
1031         isc_result_t result;
1032         dns_rdataset_t rdataset;
1033
1034         for (result = dns_rdatasetiter_first(rdsiter);
1035              result == ISC_R_SUCCESS;
1036              result = dns_rdatasetiter_next(rdsiter)) {
1037
1038                 dns_rdataset_init(&rdataset);
1039                 dns_rdatasetiter_current(rdsiter, &rdataset);
1040
1041                 if (((rdataset.attributes & DNS_RDATASETATTR_NEGATIVE) != 0) &&
1042                     (ctx->style.flags & DNS_STYLEFLAG_NCACHE) == 0) {
1043                         /* Omit negative cache entries */
1044                 } else {
1045                         result = dump_rdataset_raw(mctx, name, &rdataset,
1046                                                    buffer, f);
1047                 }
1048                 dns_rdataset_disassociate(&rdataset);
1049                 if (result != ISC_R_SUCCESS)
1050                         return (result);
1051         }
1052
1053         if (result == ISC_R_NOMORE)
1054                 result = ISC_R_SUCCESS;
1055
1056         return (result);
1057 }
1058
1059 /*
1060  * Initial size of text conversion buffer.  The buffer is used
1061  * for several purposes: converting origin names, rdatasets,
1062  * $DATE timestamps, and comment strings for $TTL directives.
1063  *
1064  * When converting rdatasets, it is dynamically resized, but
1065  * when converting origins, timestamps, etc it is not.  Therefore,
1066  * the initial size must large enough to hold the longest possible
1067  * text representation of any domain name (for $ORIGIN).
1068  */
1069 static const int initial_buffer_length = 1200;
1070
1071 static isc_result_t
1072 dumptostreaminc(dns_dumpctx_t *dctx);
1073
1074 static void
1075 dumpctx_destroy(dns_dumpctx_t *dctx) {
1076
1077         dctx->magic = 0;
1078         DESTROYLOCK(&dctx->lock);
1079         dns_dbiterator_destroy(&dctx->dbiter);
1080         if (dctx->version != NULL)
1081                 dns_db_closeversion(dctx->db, &dctx->version, ISC_FALSE);
1082         dns_db_detach(&dctx->db);
1083         if (dctx->task != NULL)
1084                 isc_task_detach(&dctx->task);
1085         if (dctx->file != NULL)
1086                 isc_mem_free(dctx->mctx, dctx->file);
1087         if (dctx->tmpfile != NULL)
1088                 isc_mem_free(dctx->mctx, dctx->tmpfile);
1089         isc_mem_putanddetach(&dctx->mctx, dctx, sizeof(*dctx));
1090 }
1091
1092 void
1093 dns_dumpctx_attach(dns_dumpctx_t *source, dns_dumpctx_t **target) {
1094
1095         REQUIRE(DNS_DCTX_VALID(source));
1096         REQUIRE(target != NULL && *target == NULL);
1097
1098         LOCK(&source->lock);
1099         INSIST(source->references > 0);
1100         source->references++;
1101         INSIST(source->references != 0);        /* Overflow? */
1102         UNLOCK(&source->lock);
1103
1104         *target = source;
1105 }
1106
1107 void
1108 dns_dumpctx_detach(dns_dumpctx_t **dctxp) {
1109         dns_dumpctx_t *dctx;
1110         isc_boolean_t need_destroy = ISC_FALSE;
1111
1112         REQUIRE(dctxp != NULL);
1113         dctx = *dctxp;
1114         REQUIRE(DNS_DCTX_VALID(dctx));
1115
1116         *dctxp = NULL;
1117
1118         LOCK(&dctx->lock);
1119         INSIST(dctx->references != 0);
1120         dctx->references--;
1121         if (dctx->references == 0)
1122                 need_destroy = ISC_TRUE;
1123         UNLOCK(&dctx->lock);
1124         if (need_destroy)
1125                 dumpctx_destroy(dctx);
1126 }
1127
1128 dns_dbversion_t *
1129 dns_dumpctx_version(dns_dumpctx_t *dctx) {
1130         REQUIRE(DNS_DCTX_VALID(dctx));
1131         return (dctx->version);
1132 }
1133
1134 dns_db_t *
1135 dns_dumpctx_db(dns_dumpctx_t *dctx) {
1136         REQUIRE(DNS_DCTX_VALID(dctx));
1137         return (dctx->db);
1138 }
1139
1140 void
1141 dns_dumpctx_cancel(dns_dumpctx_t *dctx) {
1142         REQUIRE(DNS_DCTX_VALID(dctx));
1143
1144         LOCK(&dctx->lock);
1145         dctx->canceled = ISC_TRUE;
1146         UNLOCK(&dctx->lock);
1147 }
1148
1149 static isc_result_t
1150 closeandrename(FILE *f, isc_result_t result, const char *temp, const char *file)
1151 {
1152         isc_result_t tresult;
1153         isc_boolean_t logit = ISC_TF(result == ISC_R_SUCCESS);
1154
1155         if (result == ISC_R_SUCCESS)
1156                 result = isc_stdio_sync(f);
1157         if (result != ISC_R_SUCCESS && logit) {
1158                 isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1159                               DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
1160                               "dumping master file: %s: fsync: %s",
1161                               temp, isc_result_totext(result));
1162                 logit = ISC_FALSE;
1163         }
1164         tresult = isc_stdio_close(f);
1165         if (result == ISC_R_SUCCESS)
1166                 result = tresult;
1167         if (result != ISC_R_SUCCESS && logit) {
1168                 isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1169                               DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
1170                               "dumping master file: %s: fclose: %s",
1171                               temp, isc_result_totext(result));
1172                 logit = ISC_FALSE;
1173         }
1174         if (result == ISC_R_SUCCESS)
1175                 result = isc_file_rename(temp, file);
1176         else
1177                 (void)isc_file_remove(temp);
1178         if (result != ISC_R_SUCCESS && logit) {
1179                 isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1180                               DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
1181                               "dumping master file: rename: %s: %s",
1182                               file, isc_result_totext(result));
1183         }
1184         return (result);
1185 }
1186
1187 static void
1188 dump_quantum(isc_task_t *task, isc_event_t *event) {
1189         isc_result_t result;
1190         isc_result_t tresult;
1191         dns_dumpctx_t *dctx;
1192
1193         REQUIRE(event != NULL);
1194         dctx = event->ev_arg;
1195         REQUIRE(DNS_DCTX_VALID(dctx));
1196         if (dctx->canceled)
1197                 result = ISC_R_CANCELED;
1198         else
1199                 result = dumptostreaminc(dctx);
1200         if (result == DNS_R_CONTINUE) {
1201                 event->ev_arg = dctx;
1202                 isc_task_send(task, &event);
1203                 return;
1204         }
1205
1206         if (dctx->file != NULL) {
1207                 tresult = closeandrename(dctx->f, result,
1208                                          dctx->tmpfile, dctx->file);
1209                 if (tresult != ISC_R_SUCCESS && result == ISC_R_SUCCESS)
1210                         result = tresult;
1211         }
1212         (dctx->done)(dctx->done_arg, result);
1213         isc_event_free(&event);
1214         dns_dumpctx_detach(&dctx);
1215 }
1216
1217 static isc_result_t
1218 task_send(dns_dumpctx_t *dctx) {
1219         isc_event_t *event;
1220
1221         event = isc_event_allocate(dctx->mctx, NULL, DNS_EVENT_DUMPQUANTUM,
1222                                    dump_quantum, dctx, sizeof(*event));
1223         if (event == NULL)
1224                 return (ISC_R_NOMEMORY);
1225         isc_task_send(dctx->task, &event);
1226         return (ISC_R_SUCCESS);
1227 }
1228
1229 static isc_result_t
1230 dumpctx_create(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
1231                const dns_master_style_t *style, FILE *f, dns_dumpctx_t **dctxp,
1232                dns_masterformat_t format)
1233 {
1234         dns_dumpctx_t *dctx;
1235         isc_result_t result;
1236         unsigned int options;
1237
1238         dctx = isc_mem_get(mctx, sizeof(*dctx));
1239         if (dctx == NULL)
1240                 return (ISC_R_NOMEMORY);
1241
1242         dctx->mctx = NULL;
1243         dctx->f = f;
1244         dctx->dbiter = NULL;
1245         dctx->db = NULL;
1246         dctx->version = NULL;
1247         dctx->done = NULL;
1248         dctx->done_arg = NULL;
1249         dctx->task = NULL;
1250         dctx->nodes = 0;
1251         dctx->first = ISC_TRUE;
1252         dctx->canceled = ISC_FALSE;
1253         dctx->file = NULL;
1254         dctx->tmpfile = NULL;
1255         dctx->format = format;
1256
1257         switch (format) {
1258         case dns_masterformat_text:
1259                 dctx->dumpsets = dump_rdatasets_text;
1260                 break;
1261         case dns_masterformat_raw:
1262                 dctx->dumpsets = dump_rdatasets_raw;
1263                 break;
1264         default:
1265                 INSIST(0);
1266                 break;
1267         }
1268
1269         result = totext_ctx_init(style, &dctx->tctx);
1270         if (result != ISC_R_SUCCESS) {
1271                 UNEXPECTED_ERROR(__FILE__, __LINE__,
1272                                  "could not set master file style");
1273                 goto cleanup;
1274         }
1275
1276         isc_stdtime_get(&dctx->now);
1277         dns_db_attach(db, &dctx->db);
1278
1279         dctx->do_date = dns_db_iscache(dctx->db);
1280
1281         if (dctx->format == dns_masterformat_text &&
1282             (dctx->tctx.style.flags & DNS_STYLEFLAG_REL_OWNER) != 0) {
1283                 options = DNS_DB_RELATIVENAMES;
1284         } else
1285                 options = 0;
1286         result = dns_db_createiterator(dctx->db, options, &dctx->dbiter);
1287         if (result != ISC_R_SUCCESS)
1288                 goto cleanup;
1289
1290         result = isc_mutex_init(&dctx->lock);
1291         if (result != ISC_R_SUCCESS)
1292                 goto cleanup;
1293         if (version != NULL)
1294                 dns_db_attachversion(dctx->db, version, &dctx->version);
1295         else if (!dns_db_iscache(db))
1296                 dns_db_currentversion(dctx->db, &dctx->version);
1297         isc_mem_attach(mctx, &dctx->mctx);
1298         dctx->references = 1;
1299         dctx->magic = DNS_DCTX_MAGIC;
1300         *dctxp = dctx;
1301         return (ISC_R_SUCCESS);
1302
1303  cleanup:
1304         if (dctx->dbiter != NULL)
1305                 dns_dbiterator_destroy(&dctx->dbiter);
1306         if (dctx->db != NULL)
1307                 dns_db_detach(&dctx->db);
1308         if (dctx != NULL)
1309                 isc_mem_put(mctx, dctx, sizeof(*dctx));
1310         return (result);
1311 }
1312
1313 static isc_result_t
1314 dumptostreaminc(dns_dumpctx_t *dctx) {
1315         isc_result_t result;
1316         isc_buffer_t buffer;
1317         char *bufmem;
1318         isc_region_t r;
1319         dns_name_t *name;
1320         dns_fixedname_t fixname;
1321         unsigned int nodes;
1322         dns_masterrawheader_t rawheader;
1323         isc_uint32_t now32;
1324         isc_time_t start;
1325
1326         bufmem = isc_mem_get(dctx->mctx, initial_buffer_length);
1327         if (bufmem == NULL)
1328                 return (ISC_R_NOMEMORY);
1329
1330         isc_buffer_init(&buffer, bufmem, initial_buffer_length);
1331
1332         dns_fixedname_init(&fixname);
1333         name = dns_fixedname_name(&fixname);
1334
1335         if (dctx->first) {
1336                 switch (dctx->format) {
1337                 case dns_masterformat_text:
1338                         /*
1339                          * If the database has cache semantics, output an
1340                          * RFC2540 $DATE directive so that the TTLs can be
1341                          * adjusted when it is reloaded.  For zones it is not
1342                          * really needed, and it would make the file
1343                          * incompatible with pre-RFC2540 software, so we omit
1344                          * it in the zone case.
1345                          */
1346                         if (dctx->do_date) {
1347                                 result = dns_time32_totext(dctx->now, &buffer);
1348                                 RUNTIME_CHECK(result == ISC_R_SUCCESS);
1349                                 isc_buffer_usedregion(&buffer, &r);
1350                                 fprintf(dctx->f, "$DATE %.*s\n",
1351                                         (int) r.length, (char *) r.base);
1352                         }
1353                         break;
1354                 case dns_masterformat_raw:
1355                         r.base = (unsigned char *)&rawheader;
1356                         r.length = sizeof(rawheader);
1357                         isc_buffer_region(&buffer, &r);
1358                         isc_buffer_putuint32(&buffer, dns_masterformat_raw);
1359                         isc_buffer_putuint32(&buffer, DNS_RAWFORMAT_VERSION);
1360 #if !defined(STDTIME_ON_32BITS) || (STDTIME_ON_32BITS + 0) != 1
1361                         /*
1362                          * We assume isc_stdtime_t is a 32-bit integer,
1363                          * which should be the case on most cases.
1364                          * If it turns out to be uncommon, we'll need
1365                          * to bump the version number and revise the
1366                          * header format.
1367                          */
1368                         isc_log_write(dns_lctx,
1369                                       ISC_LOGCATEGORY_GENERAL,
1370                                       DNS_LOGMODULE_MASTERDUMP,
1371                                       ISC_LOG_INFO,
1372                                       "dumping master file in raw "
1373                                       "format: stdtime is not 32bits");
1374                         now32 = 0;
1375 #else
1376                         now32 = dctx->now;
1377 #endif
1378                         isc_buffer_putuint32(&buffer, now32);
1379                         INSIST(isc_buffer_usedlength(&buffer) <=
1380                                sizeof(rawheader));
1381                         result = isc_stdio_write(buffer.base, 1,
1382                                                  isc_buffer_usedlength(&buffer),
1383                                                  dctx->f, NULL);
1384                         if (result != ISC_R_SUCCESS)
1385                                 return (result);
1386                         isc_buffer_clear(&buffer);
1387                         break;
1388                 default:
1389                         INSIST(0);
1390                 }
1391
1392                 result = dns_dbiterator_first(dctx->dbiter);
1393                 dctx->first = ISC_FALSE;
1394         } else
1395                 result = ISC_R_SUCCESS;
1396
1397         nodes = dctx->nodes;
1398         isc_time_now(&start);
1399         while (result == ISC_R_SUCCESS && (dctx->nodes == 0 || nodes--)) {
1400                 dns_rdatasetiter_t *rdsiter = NULL;
1401                 dns_dbnode_t *node = NULL;
1402
1403                 result = dns_dbiterator_current(dctx->dbiter, &node, name);
1404                 if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN)
1405                         break;
1406                 if (result == DNS_R_NEWORIGIN) {
1407                         dns_name_t *origin =
1408                                 dns_fixedname_name(&dctx->tctx.origin_fixname);
1409                         result = dns_dbiterator_origin(dctx->dbiter, origin);
1410                         RUNTIME_CHECK(result == ISC_R_SUCCESS);
1411                         if ((dctx->tctx.style.flags & DNS_STYLEFLAG_REL_DATA) != 0)
1412                                 dctx->tctx.origin = origin;
1413                         dctx->tctx.neworigin = origin;
1414                 }
1415                 result = dns_db_allrdatasets(dctx->db, node, dctx->version,
1416                                              dctx->now, &rdsiter);
1417                 if (result != ISC_R_SUCCESS) {
1418                         dns_db_detachnode(dctx->db, &node);
1419                         goto fail;
1420                 }
1421                 result = (dctx->dumpsets)(dctx->mctx, name, rdsiter,
1422                                           &dctx->tctx, &buffer, dctx->f);
1423                 dns_rdatasetiter_destroy(&rdsiter);
1424                 if (result != ISC_R_SUCCESS) {
1425                         dns_db_detachnode(dctx->db, &node);
1426                         goto fail;
1427                 }
1428                 dns_db_detachnode(dctx->db, &node);
1429                 result = dns_dbiterator_next(dctx->dbiter);
1430         }
1431
1432         /*
1433          * Work out how many nodes can be written in the time between
1434          * two requests to the nameserver.  Smooth the resulting number and
1435          * use it as a estimate for the number of nodes to be written in the
1436          * next iteration.
1437          */
1438         if (dctx->nodes != 0 && result == ISC_R_SUCCESS) {
1439                 unsigned int pps = dns_pps;     /* packets per second */
1440                 unsigned int interval;
1441                 isc_uint64_t usecs;
1442                 isc_time_t end;
1443
1444                 isc_time_now(&end);
1445                 if (pps < 100)
1446                         pps = 100;
1447                 interval = 1000000 / pps;       /* interval in usecs */
1448                 if (interval == 0)
1449                         interval = 1;
1450                 usecs = isc_time_microdiff(&end, &start);
1451                 if (usecs == 0) {
1452                         dctx->nodes = dctx->nodes * 2;
1453                         if (dctx->nodes > 1000)
1454                                 dctx->nodes = 1000;
1455                 } else {
1456                         nodes = dctx->nodes * interval;
1457                         nodes /= (unsigned int)usecs;
1458                         if (nodes == 0)
1459                                 nodes = 1;
1460                         else if (nodes > 1000)
1461                                 nodes = 1000;
1462
1463                         /* Smooth and assign. */
1464                         dctx->nodes = (nodes + dctx->nodes * 7) / 8;
1465
1466                         isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1467                                       DNS_LOGMODULE_MASTERDUMP,
1468                                       ISC_LOG_DEBUG(1),
1469                                       "dumptostreaminc(%p) new nodes -> %d\n",
1470                                       dctx, dctx->nodes);
1471                 }
1472                 result = DNS_R_CONTINUE;
1473         } else if (result == ISC_R_NOMORE)
1474                 result = ISC_R_SUCCESS;
1475  fail:
1476         RUNTIME_CHECK(dns_dbiterator_pause(dctx->dbiter) == ISC_R_SUCCESS);
1477         isc_mem_put(dctx->mctx, buffer.base, buffer.length);
1478         return (result);
1479 }
1480
1481 isc_result_t
1482 dns_master_dumptostreaminc(isc_mem_t *mctx, dns_db_t *db,
1483                            dns_dbversion_t *version,
1484                            const dns_master_style_t *style,
1485                            FILE *f, isc_task_t *task,
1486                            dns_dumpdonefunc_t done, void *done_arg,
1487                            dns_dumpctx_t **dctxp)
1488 {
1489         dns_dumpctx_t *dctx = NULL;
1490         isc_result_t result;
1491
1492         REQUIRE(task != NULL);
1493         REQUIRE(f != NULL);
1494         REQUIRE(done != NULL);
1495
1496         result = dumpctx_create(mctx, db, version, style, f, &dctx,
1497                                 dns_masterformat_text);
1498         if (result != ISC_R_SUCCESS)
1499                 return (result);
1500         isc_task_attach(task, &dctx->task);
1501         dctx->done = done;
1502         dctx->done_arg = done_arg;
1503         dctx->nodes = 100;
1504
1505         result = task_send(dctx);
1506         if (result == ISC_R_SUCCESS) {
1507                 dns_dumpctx_attach(dctx, dctxp);
1508                 return (DNS_R_CONTINUE);
1509         }
1510
1511         dns_dumpctx_detach(&dctx);
1512         return (result);
1513 }
1514
1515 /*
1516  * Dump an entire database into a master file.
1517  */
1518 isc_result_t
1519 dns_master_dumptostream(isc_mem_t *mctx, dns_db_t *db,
1520                         dns_dbversion_t *version,
1521                         const dns_master_style_t *style,
1522                         FILE *f)
1523 {
1524         return (dns_master_dumptostream2(mctx, db, version, style,
1525                                          dns_masterformat_text, f));
1526 }
1527
1528 isc_result_t
1529 dns_master_dumptostream2(isc_mem_t *mctx, dns_db_t *db,
1530                          dns_dbversion_t *version,
1531                          const dns_master_style_t *style,
1532                          dns_masterformat_t format, FILE *f)
1533 {
1534         dns_dumpctx_t *dctx = NULL;
1535         isc_result_t result;
1536
1537         result = dumpctx_create(mctx, db, version, style, f, &dctx, format);
1538         if (result != ISC_R_SUCCESS)
1539                 return (result);
1540
1541         result = dumptostreaminc(dctx);
1542         INSIST(result != DNS_R_CONTINUE);
1543         dns_dumpctx_detach(&dctx);
1544         return (result);
1545 }
1546
1547 static isc_result_t
1548 opentmp(isc_mem_t *mctx, const char *file, char **tempp, FILE **fp) {
1549         FILE *f = NULL;
1550         isc_result_t result;
1551         char *tempname = NULL;
1552         int tempnamelen;
1553
1554         tempnamelen = strlen(file) + 20;
1555         tempname = isc_mem_allocate(mctx, tempnamelen);
1556         if (tempname == NULL)
1557                 return (ISC_R_NOMEMORY);
1558
1559         result = isc_file_mktemplate(file, tempname, tempnamelen);
1560         if (result != ISC_R_SUCCESS)
1561                 goto cleanup;
1562
1563         result = isc_file_openunique(tempname, &f);
1564         if (result != ISC_R_SUCCESS) {
1565                 isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1566                               DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
1567                               "dumping master file: %s: open: %s",
1568                               tempname, isc_result_totext(result));
1569                 goto cleanup;
1570         }
1571         *tempp = tempname;
1572         *fp = f;
1573         return (ISC_R_SUCCESS);
1574
1575 cleanup:
1576         isc_mem_free(mctx, tempname);
1577         return (result);
1578 }
1579
1580 isc_result_t
1581 dns_master_dumpinc(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
1582                    const dns_master_style_t *style, const char *filename,
1583                    isc_task_t *task, dns_dumpdonefunc_t done, void *done_arg,
1584                    dns_dumpctx_t **dctxp)
1585 {
1586         return (dns_master_dumpinc2(mctx, db, version, style, filename, task,
1587                                     done, done_arg, dctxp,
1588                                     dns_masterformat_text));
1589 }
1590
1591 isc_result_t
1592 dns_master_dumpinc2(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
1593                     const dns_master_style_t *style, const char *filename,
1594                     isc_task_t *task, dns_dumpdonefunc_t done, void *done_arg,
1595                     dns_dumpctx_t **dctxp, dns_masterformat_t format)
1596 {
1597         FILE *f = NULL;
1598         isc_result_t result;
1599         char *tempname = NULL;
1600         char *file = NULL;
1601         dns_dumpctx_t *dctx = NULL;
1602
1603         file = isc_mem_strdup(mctx, filename);
1604         if (file == NULL)
1605                 return (ISC_R_NOMEMORY);
1606
1607         result = opentmp(mctx, filename, &tempname, &f);
1608         if (result != ISC_R_SUCCESS)
1609                 goto cleanup;
1610
1611         result = dumpctx_create(mctx, db, version, style, f, &dctx, format);
1612         if (result != ISC_R_SUCCESS) {
1613                 (void)isc_stdio_close(f);
1614                 (void)isc_file_remove(tempname);
1615                 goto cleanup;
1616         }
1617
1618         isc_task_attach(task, &dctx->task);
1619         dctx->done = done;
1620         dctx->done_arg = done_arg;
1621         dctx->nodes = 100;
1622         dctx->file = file;
1623         file = NULL;
1624         dctx->tmpfile = tempname;
1625         tempname = NULL;
1626
1627         result = task_send(dctx);
1628         if (result == ISC_R_SUCCESS) {
1629                 dns_dumpctx_attach(dctx, dctxp);
1630                 return (DNS_R_CONTINUE);
1631         }
1632
1633  cleanup:
1634         if (dctx != NULL)
1635                 dns_dumpctx_detach(&dctx);
1636         if (file != NULL)
1637                 isc_mem_free(mctx, file);
1638         if (tempname != NULL)
1639                 isc_mem_free(mctx, tempname);
1640         return (result);
1641 }
1642
1643 isc_result_t
1644 dns_master_dump(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
1645                 const dns_master_style_t *style, const char *filename)
1646 {
1647         return (dns_master_dump2(mctx, db, version, style, filename,
1648                                  dns_masterformat_text));
1649 }
1650
1651 isc_result_t
1652 dns_master_dump2(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
1653                  const dns_master_style_t *style, const char *filename,
1654                  dns_masterformat_t format)
1655 {
1656         FILE *f = NULL;
1657         isc_result_t result;
1658         char *tempname;
1659         dns_dumpctx_t *dctx = NULL;
1660
1661         result = opentmp(mctx, filename, &tempname, &f);
1662         if (result != ISC_R_SUCCESS)
1663                 return (result);
1664
1665         result = dumpctx_create(mctx, db, version, style, f, &dctx, format);
1666         if (result != ISC_R_SUCCESS)
1667                 goto cleanup;
1668
1669         result = dumptostreaminc(dctx);
1670         INSIST(result != DNS_R_CONTINUE);
1671         dns_dumpctx_detach(&dctx);
1672
1673         result = closeandrename(f, result, tempname, filename);
1674
1675  cleanup:
1676         isc_mem_free(mctx, tempname);
1677         return (result);
1678 }
1679
1680 /*
1681  * Dump a database node into a master file.
1682  * XXX: this function assumes the text format.
1683  */
1684 isc_result_t
1685 dns_master_dumpnodetostream(isc_mem_t *mctx, dns_db_t *db,
1686                             dns_dbversion_t *version,
1687                             dns_dbnode_t *node, dns_name_t *name,
1688                             const dns_master_style_t *style,
1689                             FILE *f)
1690 {
1691         isc_result_t result;
1692         isc_buffer_t buffer;
1693         char *bufmem;
1694         isc_stdtime_t now;
1695         dns_totext_ctx_t ctx;
1696         dns_rdatasetiter_t *rdsiter = NULL;
1697
1698         result = totext_ctx_init(style, &ctx);
1699         if (result != ISC_R_SUCCESS) {
1700                 UNEXPECTED_ERROR(__FILE__, __LINE__,
1701                                  "could not set master file style");
1702                 return (ISC_R_UNEXPECTED);
1703         }
1704
1705         isc_stdtime_get(&now);
1706
1707         bufmem = isc_mem_get(mctx, initial_buffer_length);
1708         if (bufmem == NULL)
1709                 return (ISC_R_NOMEMORY);
1710
1711         isc_buffer_init(&buffer, bufmem, initial_buffer_length);
1712
1713         result = dns_db_allrdatasets(db, node, version, now, &rdsiter);
1714         if (result != ISC_R_SUCCESS)
1715                 goto failure;
1716         result = dump_rdatasets_text(mctx, name, rdsiter, &ctx, &buffer, f);
1717         if (result != ISC_R_SUCCESS)
1718                 goto failure;
1719         dns_rdatasetiter_destroy(&rdsiter);
1720
1721         result = ISC_R_SUCCESS;
1722
1723  failure:
1724         isc_mem_put(mctx, buffer.base, buffer.length);
1725         return (result);
1726 }
1727
1728 isc_result_t
1729 dns_master_dumpnode(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
1730                     dns_dbnode_t *node, dns_name_t *name,
1731                     const dns_master_style_t *style, const char *filename)
1732 {
1733         FILE *f = NULL;
1734         isc_result_t result;
1735
1736         result = isc_stdio_open(filename, "w", &f);
1737         if (result != ISC_R_SUCCESS) {
1738                 isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1739                               DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
1740                               "dumping node to file: %s: open: %s", filename,
1741                               isc_result_totext(result));
1742                 return (ISC_R_UNEXPECTED);
1743         }
1744
1745         result = dns_master_dumpnodetostream(mctx, db, version, node, name,
1746                                              style, f);
1747         if (result != ISC_R_SUCCESS) {
1748                 isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1749                               DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
1750                               "dumping master file: %s: dump: %s", filename,
1751                               isc_result_totext(result));
1752                 (void)isc_stdio_close(f);
1753                 return (ISC_R_UNEXPECTED);
1754         }
1755
1756         result = isc_stdio_close(f);
1757         if (result != ISC_R_SUCCESS) {
1758                 isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1759                               DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
1760                               "dumping master file: %s: close: %s", filename,
1761                               isc_result_totext(result));
1762                 return (ISC_R_UNEXPECTED);
1763         }
1764
1765         return (result);
1766 }
1767 #endif /* BIND9 */
1768
1769 isc_result_t
1770 dns_master_stylecreate(dns_master_style_t **stylep, unsigned int flags,
1771                        unsigned int ttl_column, unsigned int class_column,
1772                        unsigned int type_column, unsigned int rdata_column,
1773                        unsigned int line_length, unsigned int tab_width,
1774                        isc_mem_t *mctx)
1775 {
1776         dns_master_style_t *style;
1777
1778         REQUIRE(stylep != NULL && *stylep == NULL);
1779         style = isc_mem_get(mctx, sizeof(*style));
1780         if (style == NULL)
1781                 return (ISC_R_NOMEMORY);
1782
1783         style->flags = flags;
1784         style->ttl_column = ttl_column;
1785         style->class_column = class_column;
1786         style->type_column = type_column;
1787         style->rdata_column = rdata_column;
1788         style->line_length = line_length;
1789         style->tab_width = tab_width;
1790
1791         *stylep = style;
1792         return (ISC_R_SUCCESS);
1793 }
1794
1795 void
1796 dns_master_styledestroy(dns_master_style_t **stylep, isc_mem_t *mctx) {
1797         dns_master_style_t *style;
1798
1799         REQUIRE(stylep != NULL && *stylep != NULL);
1800         style = *stylep;
1801         *stylep = NULL;
1802         isc_mem_put(mctx, style, sizeof(*style));
1803 }