contrib/bind9/lib/dns/masterdump.c

   1 /*
   2  * Copyright (C) 2004-2009  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 1.94.50.2 2009/01/18 23:47:40 tbox 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/rdata.h>
  46 #include <dns/rdataclass.h>
  47 #include <dns/rdataset.h>
  48 #include <dns/rdatasetiter.h>
  49 #include <dns/rdatatype.h>
  50 #include <dns/result.h>
  51 #include <dns/time.h>
  52 #include <dns/ttl.h>
  53
  54 #define DNS_DCTX_MAGIC          ISC_MAGIC('D', 'c', 't', 'x')
  55 #define DNS_DCTX_VALID(d)       ISC_MAGIC_VALID(d, DNS_DCTX_MAGIC)
  56
  57 #define RETERR(x) do { \
  58         isc_result_t _r = (x); \
  59         if (_r != ISC_R_SUCCESS) \
  60                 return (_r); \
  61         } while (0)
  62
  63 struct dns_master_style {
  64         unsigned int flags;             /* DNS_STYLEFLAG_* */
  65         unsigned int ttl_column;
  66         unsigned int class_column;
  67         unsigned int type_column;
  68         unsigned int rdata_column;
  69         unsigned int line_length;
  70         unsigned int tab_width;
  71 };
  72
  73 /*%
  74  * The maximum length of the newline+indentation that is output
  75  * when inserting a line break in an RR.  This effectively puts an
  76  * upper limits on the value of "rdata_column", because if it is
  77  * very large, the tabs and spaces needed to reach it will not fit.
  78  */
  79 #define DNS_TOTEXT_LINEBREAK_MAXLEN 100
  80
  81 /*%
  82  * Context structure for a masterfile dump in progress.
  83  */
  84 typedef struct dns_totext_ctx {
  85         dns_master_style_t      style;
  86         isc_boolean_t           class_printed;
  87         char *                  linebreak;
  88         char                    linebreak_buf[DNS_TOTEXT_LINEBREAK_MAXLEN];
  89         dns_name_t *            origin;
  90         dns_name_t *            neworigin;
  91         dns_fixedname_t         origin_fixname;
  92         isc_uint32_t            current_ttl;
  93         isc_boolean_t           current_ttl_valid;
  94 } dns_totext_ctx_t;
  95
  96 LIBDNS_EXTERNAL_DATA const dns_master_style_t
  97 dns_master_style_default = {
  98         DNS_STYLEFLAG_OMIT_OWNER |
  99         DNS_STYLEFLAG_OMIT_CLASS |
 100         DNS_STYLEFLAG_REL_OWNER |
 101         DNS_STYLEFLAG_REL_DATA |
 102         DNS_STYLEFLAG_OMIT_TTL |
 103         DNS_STYLEFLAG_TTL |
 104         DNS_STYLEFLAG_COMMENT |
 105         DNS_STYLEFLAG_MULTILINE,
 106         24, 24, 24, 32, 80, 8
 107 };
 108
 109 LIBDNS_EXTERNAL_DATA const dns_master_style_t
 110 dns_master_style_full = {
 111         DNS_STYLEFLAG_COMMENT |
 112         DNS_STYLEFLAG_RESIGN,
 113         46, 46, 46, 64, 120, 8
 114 };
 115
 116 LIBDNS_EXTERNAL_DATA const dns_master_style_t
 117 dns_master_style_explicitttl = {
 118         DNS_STYLEFLAG_OMIT_OWNER |
 119         DNS_STYLEFLAG_OMIT_CLASS |
 120         DNS_STYLEFLAG_REL_OWNER |
 121         DNS_STYLEFLAG_REL_DATA |
 122         DNS_STYLEFLAG_COMMENT |
 123         DNS_STYLEFLAG_MULTILINE,
 124         24, 32, 32, 40, 80, 8
 125 };
 126
 127 LIBDNS_EXTERNAL_DATA const dns_master_style_t
 128 dns_master_style_cache = {
 129         DNS_STYLEFLAG_OMIT_OWNER |
 130         DNS_STYLEFLAG_OMIT_CLASS |
 131         DNS_STYLEFLAG_MULTILINE |
 132         DNS_STYLEFLAG_TRUST |
 133         DNS_STYLEFLAG_NCACHE,
 134         24, 32, 32, 40, 80, 8
 135 };
 136
 137 LIBDNS_EXTERNAL_DATA const dns_master_style_t
 138 dns_master_style_simple = {
 139         0,
 140         24, 32, 32, 40, 80, 8
 141 };
 142
 143 /*%
 144  * A style suitable for dns_rdataset_totext().
 145  */
 146 LIBDNS_EXTERNAL_DATA const dns_master_style_t
 147 dns_master_style_debug = {
 148         DNS_STYLEFLAG_REL_OWNER,
 149         24, 32, 40, 48, 80, 8
 150 };
 151
 152
 153 #define N_SPACES 10
 154 static char spaces[N_SPACES+1] = "          ";
 155
 156 #define N_TABS 10
 157 static char tabs[N_TABS+1] = "\t\t\t\t\t\t\t\t\t\t";
 158
 159 struct dns_dumpctx {
 160         unsigned int            magic;
 161         isc_mem_t               *mctx;
 162         isc_mutex_t             lock;
 163         unsigned int            references;
 164         isc_boolean_t           canceled;
 165         isc_boolean_t           first;
 166         isc_boolean_t           do_date;
 167         isc_stdtime_t           now;
 168         FILE                    *f;
 169         dns_db_t                *db;
 170         dns_dbversion_t         *version;
 171         dns_dbiterator_t        *dbiter;
 172         dns_totext_ctx_t        tctx;
 173         isc_task_t              *task;
 174         dns_dumpdonefunc_t      done;
 175         void                    *done_arg;
 176         unsigned int            nodes;
 177         /* dns_master_dumpinc() */
 178         char                    *file;
 179         char                    *tmpfile;
 180         dns_masterformat_t      format;
 181         isc_result_t            (*dumpsets)(isc_mem_t *mctx, dns_name_t *name,
 182                                             dns_rdatasetiter_t *rdsiter,
 183                                             dns_totext_ctx_t *ctx,
 184                                             isc_buffer_t *buffer, FILE *f);
 185 };
 186
 187 #define NXDOMAIN(x) (((x)->attributes & DNS_RDATASETATTR_NXDOMAIN) != 0)
 188
 189 /*%
 190  * Output tabs and spaces to go from column '*current' to
 191  * column 'to', and update '*current' to reflect the new
 192  * current column.
 193  */
 194 static isc_result_t
 195 indent(unsigned int *current, unsigned int to, int tabwidth,
 196        isc_buffer_t *target)
 197 {
 198         isc_region_t r;
 199         unsigned char *p;
 200         unsigned int from;
 201         int ntabs, nspaces, t;
 202
 203         from = *current;
 204
 205         if (to < from + 1)
 206                 to = from + 1;
 207
 208         ntabs = to / tabwidth - from / tabwidth;
 209         if (ntabs < 0)
 210                 ntabs = 0;
 211
 212         if (ntabs > 0) {
 213                 isc_buffer_availableregion(target, &r);
 214                 if (r.length < (unsigned) ntabs)
 215                         return (ISC_R_NOSPACE);
 216                 p = r.base;
 217
 218                 t = ntabs;
 219                 while (t) {
 220                         int n = t;
 221                         if (n > N_TABS)
 222                                 n = N_TABS;
 223                         memcpy(p, tabs, n);
 224                         p += n;
 225                         t -= n;
 226                 }
 227                 isc_buffer_add(target, ntabs);
 228                 from = (to / tabwidth) * tabwidth;
 229         }
 230
 231         nspaces = to - from;
 232         INSIST(nspaces >= 0);
 233
 234         isc_buffer_availableregion(target, &r);
 235         if (r.length < (unsigned) nspaces)
 236                 return (ISC_R_NOSPACE);
 237         p = r.base;
 238
 239         t = nspaces;
 240         while (t) {
 241                 int n = t;
 242                 if (n > N_SPACES)
 243                         n = N_SPACES;
 244                 memcpy(p, spaces, n);
 245                 p += n;
 246                 t -= n;
 247         }
 248         isc_buffer_add(target, nspaces);
 249
 250         *current = to;
 251         return (ISC_R_SUCCESS);
 252 }
 253
 254 static isc_result_t
 255 totext_ctx_init(const dns_master_style_t *style, dns_totext_ctx_t *ctx) {
 256         isc_result_t result;
 257
 258         REQUIRE(style->tab_width != 0);
 259
 260         ctx->style = *style;
 261         ctx->class_printed = ISC_FALSE;
 262
 263         dns_fixedname_init(&ctx->origin_fixname);
 264
 265         /*
 266          * Set up the line break string if needed.
 267          */
 268         if ((ctx->style.flags & DNS_STYLEFLAG_MULTILINE) != 0) {
 269                 isc_buffer_t buf;
 270                 isc_region_t r;
 271                 unsigned int col = 0;
 272
 273                 isc_buffer_init(&buf, ctx->linebreak_buf,
 274                                 sizeof(ctx->linebreak_buf));
 275
 276                 isc_buffer_availableregion(&buf, &r);
 277                 if (r.length < 1)
 278                         return (DNS_R_TEXTTOOLONG);
 279                 r.base[0] = '\n';
 280                 isc_buffer_add(&buf, 1);
 281
 282                 result = indent(&col, ctx->style.rdata_column,
 283                                 ctx->style.tab_width, &buf);
 284                 /*
 285                  * Do not return ISC_R_NOSPACE if the line break string
 286                  * buffer is too small, because that would just make
 287                  * dump_rdataset() retry indefinitely with ever
 288                  * bigger target buffers.  That's a different buffer,
 289                  * so it won't help.  Use DNS_R_TEXTTOOLONG as a substitute.
 290                  */
 291                 if (result == ISC_R_NOSPACE)
 292                         return (DNS_R_TEXTTOOLONG);
 293                 if (result != ISC_R_SUCCESS)
 294                         return (result);
 295
 296                 isc_buffer_availableregion(&buf, &r);
 297                 if (r.length < 1)
 298                         return (DNS_R_TEXTTOOLONG);
 299                 r.base[0] = '\0';
 300                 isc_buffer_add(&buf, 1);
 301                 ctx->linebreak = ctx->linebreak_buf;
 302         } else {
 303                 ctx->linebreak = NULL;
 304         }
 305
 306         ctx->origin = NULL;
 307         ctx->neworigin = NULL;
 308         ctx->current_ttl = 0;
 309         ctx->current_ttl_valid = ISC_FALSE;
 310
 311         return (ISC_R_SUCCESS);
 312 }
 313
 314 #define INDENT_TO(col) \
 315         do { \
 316                  if ((result = indent(&column, ctx->style.col, \
 317                                       ctx->style.tab_width, target)) \
 318                      != ISC_R_SUCCESS) \
 319                             return (result); \
 320         } while (0)
 321
 322
 323 static isc_result_t
 324 str_totext(const char *source, isc_buffer_t *target) {
 325         unsigned int l;
 326         isc_region_t region;
 327
 328         isc_buffer_availableregion(target, &region);
 329         l = strlen(source);
 330
 331         if (l > region.length)
 332                 return (ISC_R_NOSPACE);
 333
 334         memcpy(region.base, source, l);
 335         isc_buffer_add(target, l);
 336         return (ISC_R_SUCCESS);
 337 }
 338
 339 /*
 340  * Convert 'rdataset' to master file text format according to 'ctx',
 341  * storing the result in 'target'.  If 'owner_name' is NULL, it
 342  * is omitted; otherwise 'owner_name' must be valid and have at least
 343  * one label.
 344  */
 345
 346 static isc_result_t
 347 rdataset_totext(dns_rdataset_t *rdataset,
 348                 dns_name_t *owner_name,
 349                 dns_totext_ctx_t *ctx,
 350                 isc_boolean_t omit_final_dot,
 351                 isc_buffer_t *target)
 352 {
 353         isc_result_t result;
 354         unsigned int column;
 355         isc_boolean_t first = ISC_TRUE;
 356         isc_uint32_t current_ttl;
 357         isc_boolean_t current_ttl_valid;
 358         dns_rdatatype_t type;
 359
 360         REQUIRE(DNS_RDATASET_VALID(rdataset));
 361
 362         rdataset->attributes |= DNS_RDATASETATTR_LOADORDER;
 363         result = dns_rdataset_first(rdataset);
 364         REQUIRE(result == ISC_R_SUCCESS);
 365
 366         current_ttl = ctx->current_ttl;
 367         current_ttl_valid = ctx->current_ttl_valid;
 368
 369         do {
 370                 column = 0;
 371
 372                 /*
 373                  * Owner name.
 374                  */
 375                 if (owner_name != NULL &&
 376                     ! ((ctx->style.flags & DNS_STYLEFLAG_OMIT_OWNER) != 0 &&
 377                        !first))
 378                 {
 379                         unsigned int name_start = target->used;
 380                         RETERR(dns_name_totext(owner_name,
 381                                                omit_final_dot,
 382                                                target));
 383                         column += target->used - name_start;
 384                 }
 385
 386                 /*
 387                  * TTL.
 388                  */
 389                 if ((ctx->style.flags & DNS_STYLEFLAG_NO_TTL) == 0 &&
 390                     !((ctx->style.flags & DNS_STYLEFLAG_OMIT_TTL) != 0 &&
 391                       current_ttl_valid &&
 392                       rdataset->ttl == current_ttl))
 393                 {
 394                         char ttlbuf[64];
 395                         isc_region_t r;
 396                         unsigned int length;
 397
 398                         INDENT_TO(ttl_column);
 399                         length = snprintf(ttlbuf, sizeof(ttlbuf), "%u",
 400                                           rdataset->ttl);
 401                         INSIST(length <= sizeof(ttlbuf));
 402                         isc_buffer_availableregion(target, &r);
 403                         if (r.length < length)
 404                                 return (ISC_R_NOSPACE);
 405                         memcpy(r.base, ttlbuf, length);
 406                         isc_buffer_add(target, length);
 407                         column += length;
 408
 409                         /*
 410                          * If the $TTL directive is not in use, the TTL we
 411                          * just printed becomes the default for subsequent RRs.
 412                          */
 413                         if ((ctx->style.flags & DNS_STYLEFLAG_TTL) == 0) {
 414                                 current_ttl = rdataset->ttl;
 415                                 current_ttl_valid = ISC_TRUE;
 416                         }
 417                 }
 418
 419                 /*
 420                  * Class.
 421                  */
 422                 if ((ctx->style.flags & DNS_STYLEFLAG_NO_CLASS) == 0 &&
 423                     ((ctx->style.flags & DNS_STYLEFLAG_OMIT_CLASS) == 0 ||
 424                      ctx->class_printed == ISC_FALSE))
 425                 {
 426                         unsigned int class_start;
 427                         INDENT_TO(class_column);
 428                         class_start = target->used;
 429                         result = dns_rdataclass_totext(rdataset->rdclass,
 430                                                        target);
 431                         if (result != ISC_R_SUCCESS)
 432                                 return (result);
 433                         column += (target->used - class_start);
 434                 }
 435
 436                 /*
 437                  * Type.
 438                  */
 439
 440                 if (rdataset->type == 0) {
 441                         type = rdataset->covers;
 442                 } else {
 443                         type = rdataset->type;
 444                 }
 445
 446                 {
 447                         unsigned int type_start;
 448                         INDENT_TO(type_column);
 449                         type_start = target->used;
 450                         if (rdataset->type == 0)
 451                                 RETERR(str_totext("\\-", target));
 452                         result = dns_rdatatype_totext(type, target);
 453                         if (result != ISC_R_SUCCESS)
 454                                 return (result);
 455                         column += (target->used - type_start);
 456                 }
 457
 458                 /*
 459                  * Rdata.
 460                  */
 461                 INDENT_TO(rdata_column);
 462                 if (rdataset->type == 0) {
 463                         if (NXDOMAIN(rdataset))
 464                                 RETERR(str_totext(";-$NXDOMAIN\n", target));
 465                         else
 466                                 RETERR(str_totext(";-$NXRRSET\n", target));
 467                 } else {
 468                         dns_rdata_t rdata = DNS_RDATA_INIT;
 469                         isc_region_t r;
 470
 471                         dns_rdataset_current(rdataset, &rdata);
 472
 473                         RETERR(dns_rdata_tofmttext(&rdata,
 474                                                    ctx->origin,
 475                                                    ctx->style.flags,
 476                                                    ctx->style.line_length -
 477                                                        ctx->style.rdata_column,
 478                                                    ctx->linebreak,
 479                                                    target));
 480
 481                         isc_buffer_availableregion(target, &r);
 482                         if (r.length < 1)
 483                                 return (ISC_R_NOSPACE);
 484                         r.base[0] = '\n';
 485                         isc_buffer_add(target, 1);
 486                 }
 487
 488                 first = ISC_FALSE;
 489                 result = dns_rdataset_next(rdataset);
 490         } while (result == ISC_R_SUCCESS);
 491
 492         if (result != ISC_R_NOMORE)
 493                 return (result);
 494
 495         /*
 496          * Update the ctx state to reflect what we just printed.
 497          * This is done last, only when we are sure we will return
 498          * success, because this function may be called multiple
 499          * times with increasing buffer sizes until it succeeds,
 500          * and failed attempts must not update the state prematurely.
 501          */
 502         ctx->class_printed = ISC_TRUE;
 503         ctx->current_ttl= current_ttl;
 504         ctx->current_ttl_valid = current_ttl_valid;
 505
 506         return (ISC_R_SUCCESS);
 507 }
 508
 509 /*
 510  * Print the name, type, and class of an empty rdataset,
 511  * such as those used to represent the question section
 512  * of a DNS message.
 513  */
 514 static isc_result_t
 515 question_totext(dns_rdataset_t *rdataset,
 516                 dns_name_t *owner_name,
 517                 dns_totext_ctx_t *ctx,
 518                 isc_boolean_t omit_final_dot,
 519                 isc_buffer_t *target)
 520 {
 521         unsigned int column;
 522         isc_result_t result;
 523         isc_region_t r;
 524
 525         REQUIRE(DNS_RDATASET_VALID(rdataset));
 526         result = dns_rdataset_first(rdataset);
 527         REQUIRE(result == ISC_R_NOMORE);
 528
 529         column = 0;
 530
 531         /* Owner name */
 532         {
 533                 unsigned int name_start = target->used;
 534                 RETERR(dns_name_totext(owner_name,
 535                                        omit_final_dot,
 536                                        target));
 537                 column += target->used - name_start;
 538         }
 539
 540         /* Class */
 541         {
 542                 unsigned int class_start;
 543                 INDENT_TO(class_column);
 544                 class_start = target->used;
 545                 result = dns_rdataclass_totext(rdataset->rdclass, target);
 546                 if (result != ISC_R_SUCCESS)
 547                         return (result);
 548                 column += (target->used - class_start);
 549         }
 550
 551         /* Type */
 552         {
 553                 unsigned int type_start;
 554                 INDENT_TO(type_column);
 555                 type_start = target->used;
 556                 result = dns_rdatatype_totext(rdataset->type, target);
 557                 if (result != ISC_R_SUCCESS)
 558                         return (result);
 559                 column += (target->used - type_start);
 560         }
 561
 562         isc_buffer_availableregion(target, &r);
 563         if (r.length < 1)
 564                 return (ISC_R_NOSPACE);
 565         r.base[0] = '\n';
 566         isc_buffer_add(target, 1);
 567
 568         return (ISC_R_SUCCESS);
 569 }
 570
 571 isc_result_t
 572 dns_rdataset_totext(dns_rdataset_t *rdataset,
 573                     dns_name_t *owner_name,
 574                     isc_boolean_t omit_final_dot,
 575                     isc_boolean_t question,
 576                     isc_buffer_t *target)
 577 {
 578         dns_totext_ctx_t ctx;
 579         isc_result_t result;
 580         result = totext_ctx_init(&dns_master_style_debug, &ctx);
 581         if (result != ISC_R_SUCCESS) {
 582                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 583                                  "could not set master file style");
 584                 return (ISC_R_UNEXPECTED);
 585         }
 586
 587         /*
 588          * The caller might want to give us an empty owner
 589          * name (e.g. if they are outputting into a master
 590          * file and this rdataset has the same name as the
 591          * previous one.)
 592          */
 593         if (dns_name_countlabels(owner_name) == 0)
 594                 owner_name = NULL;
 595
 596         if (question)
 597                 return (question_totext(rdataset, owner_name, &ctx,
 598                                         omit_final_dot, target));
 599         else
 600                 return (rdataset_totext(rdataset, owner_name, &ctx,
 601                                         omit_final_dot, target));
 602 }
 603
 604 isc_result_t
 605 dns_master_rdatasettotext(dns_name_t *owner_name,
 606                           dns_rdataset_t *rdataset,
 607                           const dns_master_style_t *style,
 608                           isc_buffer_t *target)
 609 {
 610         dns_totext_ctx_t ctx;
 611         isc_result_t result;
 612         result = totext_ctx_init(style, &ctx);
 613         if (result != ISC_R_SUCCESS) {
 614                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 615                                  "could not set master file style");
 616                 return (ISC_R_UNEXPECTED);
 617         }
 618
 619         return (rdataset_totext(rdataset, owner_name, &ctx,
 620                                 ISC_FALSE, target));
 621 }
 622
 623 isc_result_t
 624 dns_master_questiontotext(dns_name_t *owner_name,
 625                           dns_rdataset_t *rdataset,
 626                           const dns_master_style_t *style,
 627                           isc_buffer_t *target)
 628 {
 629         dns_totext_ctx_t ctx;
 630         isc_result_t result;
 631         result = totext_ctx_init(style, &ctx);
 632         if (result != ISC_R_SUCCESS) {
 633                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 634                                  "could not set master file style");
 635                 return (ISC_R_UNEXPECTED);
 636         }
 637
 638         return (question_totext(rdataset, owner_name, &ctx,
 639                                 ISC_FALSE, target));
 640 }
 641
 642 /*
 643  * Print an rdataset.  'buffer' is a scratch buffer, which must have been
 644  * dynamically allocated by the caller.  It must be large enough to
 645  * hold the result from dns_ttl_totext().  If more than that is needed,
 646  * the buffer will be grown automatically.
 647  */
 648
 649 static isc_result_t
 650 dump_rdataset(isc_mem_t *mctx, dns_name_t *name, dns_rdataset_t *rdataset,
 651               dns_totext_ctx_t *ctx,
 652               isc_buffer_t *buffer, FILE *f)
 653 {
 654         isc_region_t r;
 655         isc_result_t result;
 656
 657         REQUIRE(buffer->length > 0);
 658
 659         /*
 660          * Output a $TTL directive if needed.
 661          */
 662
 663         if ((ctx->style.flags & DNS_STYLEFLAG_TTL) != 0) {
 664                 if (ctx->current_ttl_valid == ISC_FALSE ||
 665                     ctx->current_ttl != rdataset->ttl)
 666                 {
 667                         if ((ctx->style.flags & DNS_STYLEFLAG_COMMENT) != 0)
 668                         {
 669                                 isc_buffer_clear(buffer);
 670                                 result = dns_ttl_totext(rdataset->ttl,
 671                                                         ISC_TRUE, buffer);
 672                                 INSIST(result == ISC_R_SUCCESS);
 673                                 isc_buffer_usedregion(buffer, &r);
 674                                 fprintf(f, "$TTL %u\t; %.*s\n", rdataset->ttl,
 675                                         (int) r.length, (char *) r.base);
 676                         } else {
 677                                 fprintf(f, "$TTL %u\n", rdataset->ttl);
 678                         }
 679                         ctx->current_ttl = rdataset->ttl;
 680                         ctx->current_ttl_valid = ISC_TRUE;
 681                 }
 682         }
 683
 684         isc_buffer_clear(buffer);
 685
 686         /*
 687          * Generate the text representation of the rdataset into
 688          * the buffer.  If the buffer is too small, grow it.
 689          */
 690         for (;;) {
 691                 int newlength;
 692                 void *newmem;
 693                 result = rdataset_totext(rdataset, name, ctx,
 694                                          ISC_FALSE, buffer);
 695                 if (result != ISC_R_NOSPACE)
 696                         break;
 697
 698                 newlength = buffer->length * 2;
 699                 newmem = isc_mem_get(mctx, newlength);
 700                 if (newmem == NULL)
 701                         return (ISC_R_NOMEMORY);
 702                 isc_mem_put(mctx, buffer->base, buffer->length);
 703                 isc_buffer_init(buffer, newmem, newlength);
 704         }
 705         if (result != ISC_R_SUCCESS)
 706                 return (result);
 707
 708         /*
 709          * Write the buffer contents to the master file.
 710          */
 711         isc_buffer_usedregion(buffer, &r);
 712         result = isc_stdio_write(r.base, 1, (size_t)r.length, f, NULL);
 713
 714         if (result != ISC_R_SUCCESS) {
 715                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 716                                  "master file write failed: %s",
 717                                  isc_result_totext(result));
 718                 return (result);
 719         }
 720
 721         return (ISC_R_SUCCESS);
 722 }
 723
 724 /*
 725  * Define the order in which rdatasets should be printed in zone
 726  * files.  We will print SOA and NS records before others, SIGs
 727  * immediately following the things they sign, and order everything
 728  * else by RR number.  This is all just for aesthetics and
 729  * compatibility with buggy software that expects the SOA to be first;
 730  * the DNS specifications allow any order.
 731  */
 732
 733 static int
 734 dump_order(const dns_rdataset_t *rds) {
 735         int t;
 736         int sig;
 737         if (rds->type == dns_rdatatype_rrsig) {
 738                 t = rds->covers;
 739                 sig = 1;
 740         } else {
 741                 t = rds->type;
 742                 sig = 0;
 743         }
 744         switch (t) {
 745         case dns_rdatatype_soa:
 746                 t = 0;
 747                 break;
 748         case dns_rdatatype_ns:
 749                 t = 1;
 750                 break;
 751         default:
 752                 t += 2;
 753                 break;
 754         }
 755         return (t << 1) + sig;
 756 }
 757
 758 static int
 759 dump_order_compare(const void *a, const void *b) {
 760         return (dump_order(*((const dns_rdataset_t * const *) a)) -
 761                 dump_order(*((const dns_rdataset_t * const *) b)));
 762 }
 763
 764 /*
 765  * Dump all the rdatasets of a domain name to a master file.  We make
 766  * a "best effort" attempt to sort the RRsets in a nice order, but if
 767  * there are more than MAXSORT RRsets, we punt and only sort them in
 768  * groups of MAXSORT.  This is not expected to ever happen in practice
 769  * since much less than 64 RR types have been registered with the
 770  * IANA, so far, and the output will be correct (though not
 771  * aesthetically pleasing) even if it does happen.
 772  */
 773
 774 #define MAXSORT 64
 775
 776 static const char *trustnames[] = {
 777         "none",
 778         "pending-additional",
 779         "pending-answer",
 780         "additional",
 781         "glue",
 782         "answer",
 783         "authauthority",
 784         "authanswer",
 785         "secure",
 786         "local" /* aka ultimate */
 787 };
 788
 789 const char *
 790 dns_trust_totext(dns_trust_t trust) {
 791         if (trust >= sizeof(trustnames)/sizeof(*trustnames))
 792                 return ("bad");
 793         return (trustnames[trust]);
 794 }
 795
 796 static isc_result_t
 797 dump_rdatasets_text(isc_mem_t *mctx, dns_name_t *name,
 798                     dns_rdatasetiter_t *rdsiter, dns_totext_ctx_t *ctx,
 799                     isc_buffer_t *buffer, FILE *f)
 800 {
 801         isc_result_t itresult, dumpresult;
 802         isc_region_t r;
 803         dns_rdataset_t rdatasets[MAXSORT];
 804         dns_rdataset_t *sorted[MAXSORT];
 805         int i, n;
 806
 807         itresult = dns_rdatasetiter_first(rdsiter);
 808         dumpresult = ISC_R_SUCCESS;
 809
 810         if (itresult == ISC_R_SUCCESS && ctx->neworigin != NULL) {
 811                 isc_buffer_clear(buffer);
 812                 itresult = dns_name_totext(ctx->neworigin, ISC_FALSE, buffer);
 813                 RUNTIME_CHECK(itresult == ISC_R_SUCCESS);
 814                 isc_buffer_usedregion(buffer, &r);
 815                 fprintf(f, "$ORIGIN %.*s\n", (int) r.length, (char *) r.base);
 816                 ctx->neworigin = NULL;
 817         }
 818
 819  again:
 820         for (i = 0;
 821              itresult == ISC_R_SUCCESS && i < MAXSORT;
 822              itresult = dns_rdatasetiter_next(rdsiter), i++) {
 823                 dns_rdataset_init(&rdatasets[i]);
 824                 dns_rdatasetiter_current(rdsiter, &rdatasets[i]);
 825                 sorted[i] = &rdatasets[i];
 826         }
 827         n = i;
 828         INSIST(n <= MAXSORT);
 829
 830         qsort(sorted, n, sizeof(sorted[0]), dump_order_compare);
 831
 832         for (i = 0; i < n; i++) {
 833                 dns_rdataset_t *rds = sorted[i];
 834                 if (ctx->style.flags & DNS_STYLEFLAG_TRUST) {
 835                         unsigned int trust = rds->trust;
 836                         INSIST(trust < (sizeof(trustnames) /
 837                                         sizeof(trustnames[0])));
 838                         fprintf(f, "; %s\n", trustnames[trust]);
 839                 }
 840                 if (rds->type == 0 &&
 841                     (ctx->style.flags & DNS_STYLEFLAG_NCACHE) == 0) {
 842                         /* Omit negative cache entries */
 843                 } else {
 844                         isc_result_t result =
 845                                 dump_rdataset(mctx, name, rds, ctx,
 846                                                buffer, f);
 847                         if (result != ISC_R_SUCCESS)
 848                                 dumpresult = result;
 849                         if ((ctx->style.flags & DNS_STYLEFLAG_OMIT_OWNER) != 0)
 850                                 name = NULL;
 851                 }
 852                 if (ctx->style.flags & DNS_STYLEFLAG_RESIGN &&
 853                     rds->attributes & DNS_RDATASETATTR_RESIGN) {
 854                         isc_buffer_t b;
 855                         char buf[sizeof("YYYYMMDDHHMMSS")];
 856                         memset(buf, 0, sizeof(buf));
 857                         isc_buffer_init(&b, buf, sizeof(buf) - 1);
 858                         dns_time64_totext((isc_uint64_t)rds->resign, &b);
 859                         fprintf(f, "; resign=%s\n", buf);
 860                 }
 861                 dns_rdataset_disassociate(rds);
 862         }
 863
 864         if (dumpresult != ISC_R_SUCCESS)
 865                 return (dumpresult);
 866
 867         /*
 868          * If we got more data than could be sorted at once,
 869          * go handle the rest.
 870          */
 871         if (itresult == ISC_R_SUCCESS)
 872                 goto again;
 873
 874         if (itresult == ISC_R_NOMORE)
 875                 itresult = ISC_R_SUCCESS;
 876
 877         return (itresult);
 878 }
 879
 880 /*
 881  * Dump given RRsets in the "raw" format.
 882  */
 883 static isc_result_t
 884 dump_rdataset_raw(isc_mem_t *mctx, dns_name_t *name, dns_rdataset_t *rdataset,
 885                   isc_buffer_t *buffer, FILE *f)
 886 {
 887         isc_result_t result;
 888         isc_uint32_t totallen;
 889         isc_uint16_t dlen;
 890         isc_region_t r, r_hdr;
 891
 892         REQUIRE(buffer->length > 0);
 893         REQUIRE(DNS_RDATASET_VALID(rdataset));
 894
 895  restart:
 896         totallen = 0;
 897         result = dns_rdataset_first(rdataset);
 898         REQUIRE(result == ISC_R_SUCCESS);
 899
 900         isc_buffer_clear(buffer);
 901
 902         /*
 903          * Common header and owner name (length followed by name)
 904          * These fields should be in a moderate length, so we assume we
 905          * can store all of them in the initial buffer.
 906          */
 907         isc_buffer_availableregion(buffer, &r_hdr);
 908         INSIST(r_hdr.length >= sizeof(dns_masterrawrdataset_t));
 909         isc_buffer_putuint32(buffer, totallen); /* XXX: leave space */
 910         isc_buffer_putuint16(buffer, rdataset->rdclass); /* 16-bit class */
 911         isc_buffer_putuint16(buffer, rdataset->type); /* 16-bit type */
 912         isc_buffer_putuint16(buffer, rdataset->covers); /* same as type */
 913         isc_buffer_putuint32(buffer, rdataset->ttl); /* 32-bit TTL */
 914         isc_buffer_putuint32(buffer, dns_rdataset_count(rdataset));
 915         totallen = isc_buffer_usedlength(buffer);
 916         INSIST(totallen <= sizeof(dns_masterrawrdataset_t));
 917
 918         dns_name_toregion(name, &r);
 919         INSIST(isc_buffer_availablelength(buffer) >=
 920                (sizeof(dlen) + r.length));
 921         dlen = (isc_uint16_t)r.length;
 922         isc_buffer_putuint16(buffer, dlen);
 923         isc_buffer_copyregion(buffer, &r);
 924         totallen += sizeof(dlen) + r.length;
 925
 926         do {
 927                 dns_rdata_t rdata = DNS_RDATA_INIT;
 928                 isc_region_t r;
 929
 930                 dns_rdataset_current(rdataset, &rdata);
 931                 dns_rdata_toregion(&rdata, &r);
 932                 INSIST(r.length <= 0xffffU);
 933                 dlen = (isc_uint16_t)r.length;
 934
 935                 /*
 936                  * Copy the rdata into the buffer.  If the buffer is too small,
 937                  * grow it.  This should be rare, so we'll simply restart the
 938                  * entire procedure (or should we copy the old data and
 939                  * continue?).
 940                  */
 941                 if (isc_buffer_availablelength(buffer) <
 942                                                  sizeof(dlen) + r.length) {
 943                         int newlength;
 944                         void *newmem;
 945
 946                         newlength = buffer->length * 2;
 947                         newmem = isc_mem_get(mctx, newlength);
 948                         if (newmem == NULL)
 949                                 return (ISC_R_NOMEMORY);
 950                         isc_mem_put(mctx, buffer->base, buffer->length);
 951                         isc_buffer_init(buffer, newmem, newlength);
 952                         goto restart;
 953                 }
 954                 isc_buffer_putuint16(buffer, dlen);
 955                 isc_buffer_copyregion(buffer, &r);
 956                 totallen += sizeof(dlen) + r.length;
 957
 958                 result = dns_rdataset_next(rdataset);
 959         } while (result == ISC_R_SUCCESS);
 960
 961         if (result != ISC_R_NOMORE)
 962                 return (result);
 963
 964         /*
 965          * Fill in the total length field.
 966          * XXX: this is a bit tricky.  Since we have already "used" the space
 967          * for the total length in the buffer, we first remember the entire
 968          * buffer length in the region, "rewind", and then write the value.
 969          */
 970         isc_buffer_usedregion(buffer, &r);
 971         isc_buffer_clear(buffer);
 972         isc_buffer_putuint32(buffer, totallen);
 973         INSIST(isc_buffer_usedlength(buffer) < totallen);
 974
 975         /*
 976          * Write the buffer contents to the raw master file.
 977          */
 978         result = isc_stdio_write(r.base, 1, (size_t)r.length, f, NULL);
 979
 980         if (result != ISC_R_SUCCESS) {
 981                 UNEXPECTED_ERROR(__FILE__, __LINE__,
 982                                  "raw master file write failed: %s",
 983                                  isc_result_totext(result));
 984                 return (result);
 985         }
 986
 987         return (result);
 988 }
 989
 990 static isc_result_t
 991 dump_rdatasets_raw(isc_mem_t *mctx, dns_name_t *name,
 992                    dns_rdatasetiter_t *rdsiter, dns_totext_ctx_t *ctx,
 993                    isc_buffer_t *buffer, FILE *f)
 994 {
 995         isc_result_t result;
 996         dns_rdataset_t rdataset;
 997
 998         for (result = dns_rdatasetiter_first(rdsiter);
 999              result == ISC_R_SUCCESS;
1000              result = dns_rdatasetiter_next(rdsiter)) {
1001
1002                 dns_rdataset_init(&rdataset);
1003                 dns_rdatasetiter_current(rdsiter, &rdataset);
1004
1005                 if (rdataset.type == 0 &&
1006                     (ctx->style.flags & DNS_STYLEFLAG_NCACHE) == 0) {
1007                         /* Omit negative cache entries */
1008                 } else {
1009                         result = dump_rdataset_raw(mctx, name, &rdataset,
1010                                                    buffer, f);
1011                 }
1012                 dns_rdataset_disassociate(&rdataset);
1013         }
1014
1015         if (result == ISC_R_NOMORE)
1016                 result = ISC_R_SUCCESS;
1017
1018         return (result);
1019 }
1020
1021 /*
1022  * Initial size of text conversion buffer.  The buffer is used
1023  * for several purposes: converting origin names, rdatasets,
1024  * $DATE timestamps, and comment strings for $TTL directives.
1025  *
1026  * When converting rdatasets, it is dynamically resized, but
1027  * when converting origins, timestamps, etc it is not.  Therefore,
1028  * the initial size must large enough to hold the longest possible
1029  * text representation of any domain name (for $ORIGIN).
1030  */
1031 static const int initial_buffer_length = 1200;
1032
1033 static isc_result_t
1034 dumptostreaminc(dns_dumpctx_t *dctx);
1035
1036 static void
1037 dumpctx_destroy(dns_dumpctx_t *dctx) {
1038
1039         dctx->magic = 0;
1040         DESTROYLOCK(&dctx->lock);
1041         dns_dbiterator_destroy(&dctx->dbiter);
1042         if (dctx->version != NULL)
1043                 dns_db_closeversion(dctx->db, &dctx->version, ISC_FALSE);
1044         dns_db_detach(&dctx->db);
1045         if (dctx->task != NULL)
1046                 isc_task_detach(&dctx->task);
1047         if (dctx->file != NULL)
1048                 isc_mem_free(dctx->mctx, dctx->file);
1049         if (dctx->tmpfile != NULL)
1050                 isc_mem_free(dctx->mctx, dctx->tmpfile);
1051         isc_mem_putanddetach(&dctx->mctx, dctx, sizeof(*dctx));
1052 }
1053
1054 void
1055 dns_dumpctx_attach(dns_dumpctx_t *source, dns_dumpctx_t **target) {
1056
1057         REQUIRE(DNS_DCTX_VALID(source));
1058         REQUIRE(target != NULL && *target == NULL);
1059
1060         LOCK(&source->lock);
1061         INSIST(source->references > 0);
1062         source->references++;
1063         INSIST(source->references != 0);        /* Overflow? */
1064         UNLOCK(&source->lock);
1065
1066         *target = source;
1067 }
1068
1069 void
1070 dns_dumpctx_detach(dns_dumpctx_t **dctxp) {
1071         dns_dumpctx_t *dctx;
1072         isc_boolean_t need_destroy = ISC_FALSE;
1073
1074         REQUIRE(dctxp != NULL);
1075         dctx = *dctxp;
1076         REQUIRE(DNS_DCTX_VALID(dctx));
1077
1078         *dctxp = NULL;
1079
1080         LOCK(&dctx->lock);
1081         INSIST(dctx->references != 0);
1082         dctx->references--;
1083         if (dctx->references == 0)
1084                 need_destroy = ISC_TRUE;
1085         UNLOCK(&dctx->lock);
1086         if (need_destroy)
1087                 dumpctx_destroy(dctx);
1088 }
1089
1090 dns_dbversion_t *
1091 dns_dumpctx_version(dns_dumpctx_t *dctx) {
1092         REQUIRE(DNS_DCTX_VALID(dctx));
1093         return (dctx->version);
1094 }
1095
1096 dns_db_t *
1097 dns_dumpctx_db(dns_dumpctx_t *dctx) {
1098         REQUIRE(DNS_DCTX_VALID(dctx));
1099         return (dctx->db);
1100 }
1101
1102 void
1103 dns_dumpctx_cancel(dns_dumpctx_t *dctx) {
1104         REQUIRE(DNS_DCTX_VALID(dctx));
1105
1106         LOCK(&dctx->lock);
1107         dctx->canceled = ISC_TRUE;
1108         UNLOCK(&dctx->lock);
1109 }
1110
1111 static isc_result_t
1112 closeandrename(FILE *f, isc_result_t result, const char *temp, const char *file)
1113 {
1114         isc_result_t tresult;
1115         isc_boolean_t logit = ISC_TF(result == ISC_R_SUCCESS);
1116
1117         if (result == ISC_R_SUCCESS)
1118                 result = isc_stdio_sync(f);
1119         if (result != ISC_R_SUCCESS && logit) {
1120                 isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1121                               DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
1122                               "dumping master file: %s: fsync: %s",
1123                               temp, isc_result_totext(result));
1124                 logit = ISC_FALSE;
1125         }
1126         tresult = isc_stdio_close(f);
1127         if (result == ISC_R_SUCCESS)
1128                 result = tresult;
1129         if (result != ISC_R_SUCCESS && logit) {
1130                 isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1131                               DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
1132                               "dumping master file: %s: fclose: %s",
1133                               temp, isc_result_totext(result));
1134                 logit = ISC_FALSE;
1135         }
1136         if (result == ISC_R_SUCCESS)
1137                 result = isc_file_rename(temp, file);
1138         else
1139                 (void)isc_file_remove(temp);
1140         if (result != ISC_R_SUCCESS && logit) {
1141                 isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1142                               DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
1143                               "dumping master file: rename: %s: %s",
1144                               file, isc_result_totext(result));
1145         }
1146         return (result);
1147 }
1148
1149 static void
1150 dump_quantum(isc_task_t *task, isc_event_t *event) {
1151         isc_result_t result;
1152         isc_result_t tresult;
1153         dns_dumpctx_t *dctx;
1154
1155         REQUIRE(event != NULL);
1156         dctx = event->ev_arg;
1157         REQUIRE(DNS_DCTX_VALID(dctx));
1158         if (dctx->canceled)
1159                 result = ISC_R_CANCELED;
1160         else
1161                 result = dumptostreaminc(dctx);
1162         if (result == DNS_R_CONTINUE) {
1163                 event->ev_arg = dctx;
1164                 isc_task_send(task, &event);
1165                 return;
1166         }
1167
1168         if (dctx->file != NULL) {
1169                 tresult = closeandrename(dctx->f, result,
1170                                          dctx->tmpfile, dctx->file);
1171                 if (tresult != ISC_R_SUCCESS && result == ISC_R_SUCCESS)
1172                         result = tresult;
1173         }
1174         (dctx->done)(dctx->done_arg, result);
1175         isc_event_free(&event);
1176         dns_dumpctx_detach(&dctx);
1177 }
1178
1179 static isc_result_t
1180 task_send(dns_dumpctx_t *dctx) {
1181         isc_event_t *event;
1182
1183         event = isc_event_allocate(dctx->mctx, NULL, DNS_EVENT_DUMPQUANTUM,
1184                                    dump_quantum, dctx, sizeof(*event));
1185         if (event == NULL)
1186                 return (ISC_R_NOMEMORY);
1187         isc_task_send(dctx->task, &event);
1188         return (ISC_R_SUCCESS);
1189 }
1190
1191 static isc_result_t
1192 dumpctx_create(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
1193                const dns_master_style_t *style, FILE *f, dns_dumpctx_t **dctxp,
1194                dns_masterformat_t format)
1195 {
1196         dns_dumpctx_t *dctx;
1197         isc_result_t result;
1198         unsigned int options;
1199
1200         dctx = isc_mem_get(mctx, sizeof(*dctx));
1201         if (dctx == NULL)
1202                 return (ISC_R_NOMEMORY);
1203
1204         dctx->mctx = NULL;
1205         dctx->f = f;
1206         dctx->dbiter = NULL;
1207         dctx->db = NULL;
1208         dctx->version = NULL;
1209         dctx->done = NULL;
1210         dctx->done_arg = NULL;
1211         dctx->task = NULL;
1212         dctx->nodes = 0;
1213         dctx->first = ISC_TRUE;
1214         dctx->canceled = ISC_FALSE;
1215         dctx->file = NULL;
1216         dctx->tmpfile = NULL;
1217         dctx->format = format;
1218
1219         switch (format) {
1220         case dns_masterformat_text:
1221                 dctx->dumpsets = dump_rdatasets_text;
1222                 break;
1223         case dns_masterformat_raw:
1224                 dctx->dumpsets = dump_rdatasets_raw;
1225                 break;
1226         default:
1227                 INSIST(0);
1228                 break;
1229         }
1230
1231         result = totext_ctx_init(style, &dctx->tctx);
1232         if (result != ISC_R_SUCCESS) {
1233                 UNEXPECTED_ERROR(__FILE__, __LINE__,
1234                                  "could not set master file style");
1235                 goto cleanup;
1236         }
1237
1238         isc_stdtime_get(&dctx->now);
1239         dns_db_attach(db, &dctx->db);
1240
1241         dctx->do_date = dns_db_iscache(dctx->db);
1242
1243         if (dctx->format == dns_masterformat_text &&
1244             (dctx->tctx.style.flags & DNS_STYLEFLAG_REL_OWNER) != 0) {
1245                 options = DNS_DB_RELATIVENAMES;
1246         } else
1247                 options = 0;
1248         result = dns_db_createiterator(dctx->db, options, &dctx->dbiter);
1249         if (result != ISC_R_SUCCESS)
1250                 goto cleanup;
1251
1252         result = isc_mutex_init(&dctx->lock);
1253         if (result != ISC_R_SUCCESS)
1254                 goto cleanup;
1255         if (version != NULL)
1256                 dns_db_attachversion(dctx->db, version, &dctx->version);
1257         else if (!dns_db_iscache(db))
1258                 dns_db_currentversion(dctx->db, &dctx->version);
1259         isc_mem_attach(mctx, &dctx->mctx);
1260         dctx->references = 1;
1261         dctx->magic = DNS_DCTX_MAGIC;
1262         *dctxp = dctx;
1263         return (ISC_R_SUCCESS);
1264
1265  cleanup:
1266         if (dctx->dbiter != NULL)
1267                 dns_dbiterator_destroy(&dctx->dbiter);
1268         if (dctx->db != NULL)
1269                 dns_db_detach(&dctx->db);
1270         if (dctx != NULL)
1271                 isc_mem_put(mctx, dctx, sizeof(*dctx));
1272         return (result);
1273 }
1274
1275 static isc_result_t
1276 dumptostreaminc(dns_dumpctx_t *dctx) {
1277         isc_result_t result;
1278         isc_buffer_t buffer;
1279         char *bufmem;
1280         isc_region_t r;
1281         dns_name_t *name;
1282         dns_fixedname_t fixname;
1283         unsigned int nodes;
1284         dns_masterrawheader_t rawheader;
1285         isc_uint32_t now32;
1286         isc_time_t start;
1287
1288         bufmem = isc_mem_get(dctx->mctx, initial_buffer_length);
1289         if (bufmem == NULL)
1290                 return (ISC_R_NOMEMORY);
1291
1292         isc_buffer_init(&buffer, bufmem, initial_buffer_length);
1293
1294         dns_fixedname_init(&fixname);
1295         name = dns_fixedname_name(&fixname);
1296
1297         if (dctx->first) {
1298                 switch (dctx->format) {
1299                 case dns_masterformat_text:
1300                         /*
1301                          * If the database has cache semantics, output an
1302                          * RFC2540 $DATE directive so that the TTLs can be
1303                          * adjusted when it is reloaded.  For zones it is not
1304                          * really needed, and it would make the file
1305                          * incompatible with pre-RFC2540 software, so we omit
1306                          * it in the zone case.
1307                          */
1308                         if (dctx->do_date) {
1309                                 result = dns_time32_totext(dctx->now, &buffer);
1310                                 RUNTIME_CHECK(result == ISC_R_SUCCESS);
1311                                 isc_buffer_usedregion(&buffer, &r);
1312                                 fprintf(dctx->f, "$DATE %.*s\n",
1313                                         (int) r.length, (char *) r.base);
1314                         }
1315                         break;
1316                 case dns_masterformat_raw:
1317                         r.base = (unsigned char *)&rawheader;
1318                         r.length = sizeof(rawheader);
1319                         isc_buffer_region(&buffer, &r);
1320                         isc_buffer_putuint32(&buffer, dns_masterformat_raw);
1321                         isc_buffer_putuint32(&buffer, DNS_RAWFORMAT_VERSION);
1322                         if (sizeof(now32) != sizeof(dctx->now)) {
1323                                 /*
1324                                  * We assume isc_stdtime_t is a 32-bit integer,
1325                                  * which should be the case on most cases.
1326                                  * If it turns out to be uncommon, we'll need
1327                                  * to bump the version number and revise the
1328                                  * header format.
1329                                  */
1330                                 isc_log_write(dns_lctx,
1331                                               ISC_LOGCATEGORY_GENERAL,
1332                                               DNS_LOGMODULE_MASTERDUMP,
1333                                               ISC_LOG_INFO,
1334                                               "dumping master file in raw "
1335                                               "format: stdtime is not 32bits");
1336                                 now32 = 0;
1337                         } else
1338                                 now32 = dctx->now;
1339                         isc_buffer_putuint32(&buffer, now32);
1340                         INSIST(isc_buffer_usedlength(&buffer) <=
1341                                sizeof(rawheader));
1342                         result = isc_stdio_write(buffer.base, 1,
1343                                                  isc_buffer_usedlength(&buffer),
1344                                                  dctx->f, NULL);
1345                         if (result != ISC_R_SUCCESS)
1346                                 return (result);
1347                         isc_buffer_clear(&buffer);
1348                         break;
1349                 default:
1350                         INSIST(0);
1351                 }
1352
1353                 result = dns_dbiterator_first(dctx->dbiter);
1354                 dctx->first = ISC_FALSE;
1355         } else
1356                 result = ISC_R_SUCCESS;
1357
1358         nodes = dctx->nodes;
1359         isc_time_now(&start);
1360         while (result == ISC_R_SUCCESS && (dctx->nodes == 0 || nodes--)) {
1361                 dns_rdatasetiter_t *rdsiter = NULL;
1362                 dns_dbnode_t *node = NULL;
1363
1364                 result = dns_dbiterator_current(dctx->dbiter, &node, name);
1365                 if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN)
1366                         break;
1367                 if (result == DNS_R_NEWORIGIN) {
1368                         dns_name_t *origin =
1369                                 dns_fixedname_name(&dctx->tctx.origin_fixname);
1370                         result = dns_dbiterator_origin(dctx->dbiter, origin);
1371                         RUNTIME_CHECK(result == ISC_R_SUCCESS);
1372                         if ((dctx->tctx.style.flags & DNS_STYLEFLAG_REL_DATA) != 0)
1373                                 dctx->tctx.origin = origin;
1374                         dctx->tctx.neworigin = origin;
1375                 }
1376                 result = dns_db_allrdatasets(dctx->db, node, dctx->version,
1377                                              dctx->now, &rdsiter);
1378                 if (result != ISC_R_SUCCESS) {
1379                         dns_db_detachnode(dctx->db, &node);
1380                         goto fail;
1381                 }
1382                 result = (dctx->dumpsets)(dctx->mctx, name, rdsiter,
1383                                           &dctx->tctx, &buffer, dctx->f);
1384                 dns_rdatasetiter_destroy(&rdsiter);
1385                 if (result != ISC_R_SUCCESS) {
1386                         dns_db_detachnode(dctx->db, &node);
1387                         goto fail;
1388                 }
1389                 dns_db_detachnode(dctx->db, &node);
1390                 result = dns_dbiterator_next(dctx->dbiter);
1391         }
1392
1393         /*
1394          * Work out how many nodes can be written in the time between
1395          * two requests to the nameserver.  Smooth the resulting number and
1396          * use it as a estimate for the number of nodes to be written in the
1397          * next iteration.
1398          */
1399         if (dctx->nodes != 0 && result == ISC_R_SUCCESS) {
1400                 unsigned int pps = dns_pps;     /* packets per second */
1401                 unsigned int interval;
1402                 isc_uint64_t usecs;
1403                 isc_time_t end;
1404
1405                 isc_time_now(&end);
1406                 if (pps < 100)
1407                         pps = 100;
1408                 interval = 1000000 / pps;       /* interval in usecs */
1409                 if (interval == 0)
1410                         interval = 1;
1411                 usecs = isc_time_microdiff(&end, &start);
1412                 if (usecs == 0) {
1413                         dctx->nodes = dctx->nodes * 2;
1414                         if (dctx->nodes > 1000)
1415                                 dctx->nodes = 1000;
1416                 } else {
1417                         nodes = dctx->nodes * interval;
1418                         nodes /= (unsigned int)usecs;
1419                         if (nodes == 0)
1420                                 nodes = 1;
1421                         else if (nodes > 1000)
1422                                 nodes = 1000;
1423
1424                         /* Smooth and assign. */
1425                         dctx->nodes = (nodes + dctx->nodes * 7) / 8;
1426
1427                         isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1428                                       DNS_LOGMODULE_MASTERDUMP,
1429                                       ISC_LOG_DEBUG(1),
1430                                       "dumptostreaminc(%p) new nodes -> %d\n",
1431                                       dctx, dctx->nodes);
1432                 }
1433                 result = DNS_R_CONTINUE;
1434         } else if (result == ISC_R_NOMORE)
1435                 result = ISC_R_SUCCESS;
1436  fail:
1437         RUNTIME_CHECK(dns_dbiterator_pause(dctx->dbiter) == ISC_R_SUCCESS);
1438         isc_mem_put(dctx->mctx, buffer.base, buffer.length);
1439         return (result);
1440 }
1441
1442 isc_result_t
1443 dns_master_dumptostreaminc(isc_mem_t *mctx, dns_db_t *db,
1444                            dns_dbversion_t *version,
1445                            const dns_master_style_t *style,
1446                            FILE *f, isc_task_t *task,
1447                            dns_dumpdonefunc_t done, void *done_arg,
1448                            dns_dumpctx_t **dctxp)
1449 {
1450         dns_dumpctx_t *dctx = NULL;
1451         isc_result_t result;
1452
1453         REQUIRE(task != NULL);
1454         REQUIRE(f != NULL);
1455         REQUIRE(done != NULL);
1456
1457         result = dumpctx_create(mctx, db, version, style, f, &dctx,
1458                                 dns_masterformat_text);
1459         if (result != ISC_R_SUCCESS)
1460                 return (result);
1461         isc_task_attach(task, &dctx->task);
1462         dctx->done = done;
1463         dctx->done_arg = done_arg;
1464         dctx->nodes = 100;
1465
1466         result = task_send(dctx);
1467         if (result == ISC_R_SUCCESS) {
1468                 dns_dumpctx_attach(dctx, dctxp);
1469                 return (DNS_R_CONTINUE);
1470         }
1471
1472         dns_dumpctx_detach(&dctx);
1473         return (result);
1474 }
1475
1476 /*
1477  * Dump an entire database into a master file.
1478  */
1479 isc_result_t
1480 dns_master_dumptostream(isc_mem_t *mctx, dns_db_t *db,
1481                         dns_dbversion_t *version,
1482                         const dns_master_style_t *style,
1483                         FILE *f)
1484 {
1485         return (dns_master_dumptostream2(mctx, db, version, style,
1486                                          dns_masterformat_text, f));
1487 }
1488
1489 isc_result_t
1490 dns_master_dumptostream2(isc_mem_t *mctx, dns_db_t *db,
1491                          dns_dbversion_t *version,
1492                          const dns_master_style_t *style,
1493                          dns_masterformat_t format, FILE *f)
1494 {
1495         dns_dumpctx_t *dctx = NULL;
1496         isc_result_t result;
1497
1498         result = dumpctx_create(mctx, db, version, style, f, &dctx, format);
1499         if (result != ISC_R_SUCCESS)
1500                 return (result);
1501
1502         result = dumptostreaminc(dctx);
1503         INSIST(result != DNS_R_CONTINUE);
1504         dns_dumpctx_detach(&dctx);
1505         return (result);
1506 }
1507
1508 static isc_result_t
1509 opentmp(isc_mem_t *mctx, const char *file, char **tempp, FILE **fp) {
1510         FILE *f = NULL;
1511         isc_result_t result;
1512         char *tempname = NULL;
1513         int tempnamelen;
1514
1515         tempnamelen = strlen(file) + 20;
1516         tempname = isc_mem_allocate(mctx, tempnamelen);
1517         if (tempname == NULL)
1518                 return (ISC_R_NOMEMORY);
1519
1520         result = isc_file_mktemplate(file, tempname, tempnamelen);
1521         if (result != ISC_R_SUCCESS)
1522                 goto cleanup;
1523
1524         result = isc_file_openunique(tempname, &f);
1525         if (result != ISC_R_SUCCESS) {
1526                 isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1527                               DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
1528                               "dumping master file: %s: open: %s",
1529                               tempname, isc_result_totext(result));
1530                 goto cleanup;
1531         }
1532         *tempp = tempname;
1533         *fp = f;
1534         return (ISC_R_SUCCESS);
1535
1536 cleanup:
1537         isc_mem_free(mctx, tempname);
1538         return (result);
1539 }
1540
1541 isc_result_t
1542 dns_master_dumpinc(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
1543                    const dns_master_style_t *style, const char *filename,
1544                    isc_task_t *task, dns_dumpdonefunc_t done, void *done_arg,
1545                    dns_dumpctx_t **dctxp)
1546 {
1547         return (dns_master_dumpinc2(mctx, db, version, style, filename, task,
1548                                     done, done_arg, dctxp,
1549                                     dns_masterformat_text));
1550 }
1551
1552 isc_result_t
1553 dns_master_dumpinc2(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
1554                     const dns_master_style_t *style, const char *filename,
1555                     isc_task_t *task, dns_dumpdonefunc_t done, void *done_arg,
1556                     dns_dumpctx_t **dctxp, dns_masterformat_t format)
1557 {
1558         FILE *f = NULL;
1559         isc_result_t result;
1560         char *tempname = NULL;
1561         char *file = NULL;
1562         dns_dumpctx_t *dctx = NULL;
1563
1564         file = isc_mem_strdup(mctx, filename);
1565         if (file == NULL)
1566                 return (ISC_R_NOMEMORY);
1567
1568         result = opentmp(mctx, filename, &tempname, &f);
1569         if (result != ISC_R_SUCCESS)
1570                 goto cleanup;
1571
1572         result = dumpctx_create(mctx, db, version, style, f, &dctx, format);
1573         if (result != ISC_R_SUCCESS) {
1574                 (void)isc_stdio_close(f);
1575                 (void)isc_file_remove(tempname);
1576                 goto cleanup;
1577         }
1578
1579         isc_task_attach(task, &dctx->task);
1580         dctx->done = done;
1581         dctx->done_arg = done_arg;
1582         dctx->nodes = 100;
1583         dctx->file = file;
1584         file = NULL;
1585         dctx->tmpfile = tempname;
1586         tempname = NULL;
1587
1588         result = task_send(dctx);
1589         if (result == ISC_R_SUCCESS) {
1590                 dns_dumpctx_attach(dctx, dctxp);
1591                 return (DNS_R_CONTINUE);
1592         }
1593
1594  cleanup:
1595         if (dctx != NULL)
1596                 dns_dumpctx_detach(&dctx);
1597         if (file != NULL)
1598                 isc_mem_free(mctx, file);
1599         if (tempname != NULL)
1600                 isc_mem_free(mctx, tempname);
1601         return (result);
1602 }
1603
1604 isc_result_t
1605 dns_master_dump(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
1606                 const dns_master_style_t *style, const char *filename)
1607 {
1608         return (dns_master_dump2(mctx, db, version, style, filename,
1609                                  dns_masterformat_text));
1610 }
1611
1612 isc_result_t
1613 dns_master_dump2(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
1614                  const dns_master_style_t *style, const char *filename,
1615                  dns_masterformat_t format)
1616 {
1617         FILE *f = NULL;
1618         isc_result_t result;
1619         char *tempname;
1620         dns_dumpctx_t *dctx = NULL;
1621
1622         result = opentmp(mctx, filename, &tempname, &f);
1623         if (result != ISC_R_SUCCESS)
1624                 return (result);
1625
1626         result = dumpctx_create(mctx, db, version, style, f, &dctx, format);
1627         if (result != ISC_R_SUCCESS)
1628                 goto cleanup;
1629
1630         result = dumptostreaminc(dctx);
1631         INSIST(result != DNS_R_CONTINUE);
1632         dns_dumpctx_detach(&dctx);
1633
1634         result = closeandrename(f, result, tempname, filename);
1635
1636  cleanup:
1637         isc_mem_free(mctx, tempname);
1638         return (result);
1639 }
1640
1641 /*
1642  * Dump a database node into a master file.
1643  * XXX: this function assumes the text format.
1644  */
1645 isc_result_t
1646 dns_master_dumpnodetostream(isc_mem_t *mctx, dns_db_t *db,
1647                             dns_dbversion_t *version,
1648                             dns_dbnode_t *node, dns_name_t *name,
1649                             const dns_master_style_t *style,
1650                             FILE *f)
1651 {
1652         isc_result_t result;
1653         isc_buffer_t buffer;
1654         char *bufmem;
1655         isc_stdtime_t now;
1656         dns_totext_ctx_t ctx;
1657         dns_rdatasetiter_t *rdsiter = NULL;
1658
1659         result = totext_ctx_init(style, &ctx);
1660         if (result != ISC_R_SUCCESS) {
1661                 UNEXPECTED_ERROR(__FILE__, __LINE__,
1662                                  "could not set master file style");
1663                 return (ISC_R_UNEXPECTED);
1664         }
1665
1666         isc_stdtime_get(&now);
1667
1668         bufmem = isc_mem_get(mctx, initial_buffer_length);
1669         if (bufmem == NULL)
1670                 return (ISC_R_NOMEMORY);
1671
1672         isc_buffer_init(&buffer, bufmem, initial_buffer_length);
1673
1674         result = dns_db_allrdatasets(db, node, version, now, &rdsiter);
1675         if (result != ISC_R_SUCCESS)
1676                 goto failure;
1677         result = dump_rdatasets_text(mctx, name, rdsiter, &ctx, &buffer, f);
1678         if (result != ISC_R_SUCCESS)
1679                 goto failure;
1680         dns_rdatasetiter_destroy(&rdsiter);
1681
1682         result = ISC_R_SUCCESS;
1683
1684  failure:
1685         isc_mem_put(mctx, buffer.base, buffer.length);
1686         return (result);
1687 }
1688
1689 isc_result_t
1690 dns_master_dumpnode(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
1691                     dns_dbnode_t *node, dns_name_t *name,
1692                     const dns_master_style_t *style, const char *filename)
1693 {
1694         FILE *f = NULL;
1695         isc_result_t result;
1696
1697         result = isc_stdio_open(filename, "w", &f);
1698         if (result != ISC_R_SUCCESS) {
1699                 isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1700                               DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
1701                               "dumping node to file: %s: open: %s", filename,
1702                               isc_result_totext(result));
1703                 return (ISC_R_UNEXPECTED);
1704         }
1705
1706         result = dns_master_dumpnodetostream(mctx, db, version, node, name,
1707                                              style, f);
1708
1709         result = isc_stdio_close(f);
1710         if (result != ISC_R_SUCCESS) {
1711                 isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
1712                               DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
1713                               "dumping master file: %s: close: %s", filename,
1714                               isc_result_totext(result));
1715                 return (ISC_R_UNEXPECTED);
1716         }
1717
1718         return (result);
1719 }
1720
1721 isc_result_t
1722 dns_master_stylecreate(dns_master_style_t **stylep, unsigned int flags,
1723                        unsigned int ttl_column, unsigned int class_column,
1724                        unsigned int type_column, unsigned int rdata_column,
1725                        unsigned int line_length, unsigned int tab_width,
1726                        isc_mem_t *mctx)
1727 {
1728         dns_master_style_t *style;
1729
1730         REQUIRE(stylep != NULL && *stylep == NULL);
1731         style = isc_mem_get(mctx, sizeof(*style));
1732         if (style == NULL)
1733                 return (ISC_R_NOMEMORY);
1734
1735         style->flags = flags;
1736         style->ttl_column = ttl_column;
1737         style->class_column = class_column;
1738         style->type_column = type_column;
1739         style->rdata_column = rdata_column;
1740         style->line_length = line_length;
1741         style->tab_width = tab_width;
1742
1743         *stylep = style;
1744         return (ISC_R_SUCCESS);
1745 }
1746
1747 void
1748 dns_master_styledestroy(dns_master_style_t **stylep, isc_mem_t *mctx) {
1749         dns_master_style_t *style;
1750
1751         REQUIRE(stylep != NULL && *stylep != NULL);
1752         style = *stylep;
1753         *stylep = NULL;
1754         isc_mem_put(mctx, style, sizeof(*style));
1755 }