xfrin.c revision 1.11
1 /* $NetBSD: xfrin.c,v 1.11 2022/09/23 12:15:30 christos Exp $ */ 2 3 /* 4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC") 5 * 6 * SPDX-License-Identifier: MPL-2.0 7 * 8 * This Source Code Form is subject to the terms of the Mozilla Public 9 * License, v. 2.0. If a copy of the MPL was not distributed with this 10 * file, you can obtain one at https://mozilla.org/MPL/2.0/. 11 * 12 * See the COPYRIGHT file distributed with this work for additional 13 * information regarding copyright ownership. 14 */ 15 16 /*! \file */ 17 18 #include <inttypes.h> 19 #include <stdbool.h> 20 21 #include <isc/mem.h> 22 #include <isc/print.h> 23 #include <isc/random.h> 24 #include <isc/string.h> /* Required for HP/UX (and others?) */ 25 #include <isc/task.h> 26 #include <isc/timer.h> 27 #include <isc/util.h> 28 29 #include <dns/callbacks.h> 30 #include <dns/catz.h> 31 #include <dns/db.h> 32 #include <dns/diff.h> 33 #include <dns/events.h> 34 #include <dns/journal.h> 35 #include <dns/log.h> 36 #include <dns/message.h> 37 #include <dns/rdataclass.h> 38 #include <dns/rdatalist.h> 39 #include <dns/rdataset.h> 40 #include <dns/result.h> 41 #include <dns/soa.h> 42 #include <dns/tcpmsg.h> 43 #include <dns/timer.h> 44 #include <dns/tsig.h> 45 #include <dns/view.h> 46 #include <dns/xfrin.h> 47 #include <dns/zone.h> 48 49 #include <dst/dst.h> 50 51 /* 52 * Incoming AXFR and IXFR. 53 */ 54 55 /*% 56 * It would be non-sensical (or at least obtuse) to use FAIL() with an 57 * ISC_R_SUCCESS code, but the test is there to keep the Solaris compiler 58 * from complaining about "end-of-loop code not reached". 59 */ 60 #define FAIL(code) \ 61 do { \ 62 result = (code); \ 63 if (result != ISC_R_SUCCESS) \ 64 goto failure; \ 65 } while (0) 66 67 #define CHECK(op) \ 68 do { \ 69 result = (op); \ 70 if (result != ISC_R_SUCCESS) \ 71 goto failure; \ 72 } while (0) 73 74 /*% 75 * The states of the *XFR state machine. We handle both IXFR and AXFR 76 * with a single integrated state machine because they cannot be distinguished 77 * immediately - an AXFR response to an IXFR request can only be detected 78 * when the first two (2) response RRs have already been received. 79 */ 80 typedef enum { 81 XFRST_SOAQUERY, 82 XFRST_GOTSOA, 83 XFRST_INITIALSOA, 84 XFRST_FIRSTDATA, 85 XFRST_IXFR_DELSOA, 86 XFRST_IXFR_DEL, 87 XFRST_IXFR_ADDSOA, 88 XFRST_IXFR_ADD, 89 XFRST_IXFR_END, 90 XFRST_AXFR, 91 XFRST_AXFR_END 92 } xfrin_state_t; 93 94 /*% 95 * Incoming zone transfer context. 96 */ 97 98 struct dns_xfrin_ctx { 99 unsigned int magic; 100 isc_mem_t *mctx; 101 dns_zone_t *zone; 102 103 int refcount; 104 105 isc_task_t *task; 106 isc_timer_t *timer; 107 isc_socketmgr_t *socketmgr; 108 109 int connects; /*%< Connect in progress */ 110 int sends; /*%< Send in progress */ 111 int recvs; /*%< Receive in progress */ 112 bool shuttingdown; 113 isc_result_t shutdown_result; 114 115 dns_name_t name; /*%< Name of zone to transfer */ 116 dns_rdataclass_t rdclass; 117 118 bool checkid, logit; 119 dns_messageid_t id; 120 121 /*% 122 * Requested transfer type (dns_rdatatype_axfr or 123 * dns_rdatatype_ixfr). The actual transfer type 124 * may differ due to IXFR->AXFR fallback. 125 */ 126 dns_rdatatype_t reqtype; 127 isc_dscp_t dscp; 128 129 isc_sockaddr_t masteraddr; 130 isc_sockaddr_t sourceaddr; 131 isc_socket_t *socket; 132 133 /*% Buffer for IXFR/AXFR request message */ 134 isc_buffer_t qbuffer; 135 unsigned char qbuffer_data[512]; 136 137 /*% Incoming reply TCP message */ 138 dns_tcpmsg_t tcpmsg; 139 bool tcpmsg_valid; 140 141 /*% 142 * Whether the zone originally had a database attached at the time this 143 * transfer context was created. Used by maybe_free() when making 144 * logging decisions. 145 */ 146 bool zone_had_db; 147 148 dns_db_t *db; 149 dns_dbversion_t *ver; 150 dns_diff_t diff; /*%< Pending database changes */ 151 int difflen; /*%< Number of pending tuples */ 152 153 xfrin_state_t state; 154 uint32_t end_serial; 155 bool is_ixfr; 156 157 unsigned int nmsg; /*%< Number of messages recvd */ 158 unsigned int nrecs; /*%< Number of records recvd */ 159 uint64_t nbytes; /*%< Number of bytes received */ 160 161 unsigned int maxrecords; /*%< The maximum number of 162 * records set for the zone */ 163 164 isc_time_t start; /*%< Start time of the transfer */ 165 isc_time_t end; /*%< End time of the transfer */ 166 167 dns_tsigkey_t *tsigkey; /*%< Key used to create TSIG */ 168 isc_buffer_t *lasttsig; /*%< The last TSIG */ 169 dst_context_t *tsigctx; /*%< TSIG verification context */ 170 unsigned int sincetsig; /*%< recvd since the last TSIG */ 171 dns_xfrindone_t done; 172 173 /*% 174 * AXFR- and IXFR-specific data. Only one is used at a time 175 * according to the is_ixfr flag, so this could be a union, 176 * but keeping them separate makes it a bit simpler to clean 177 * things up when destroying the context. 178 */ 179 dns_rdatacallbacks_t axfr; 180 181 struct { 182 uint32_t request_serial; 183 uint32_t current_serial; 184 dns_journal_t *journal; 185 } ixfr; 186 187 dns_rdata_t firstsoa; 188 unsigned char *firstsoa_data; 189 }; 190 191 #define XFRIN_MAGIC ISC_MAGIC('X', 'f', 'r', 'I') 192 #define VALID_XFRIN(x) ISC_MAGIC_VALID(x, XFRIN_MAGIC) 193 194 /**************************************************************************/ 195 /* 196 * Forward declarations. 197 */ 198 199 static isc_result_t 200 xfrin_create(isc_mem_t *mctx, dns_zone_t *zone, dns_db_t *db, isc_task_t *task, 201 isc_timermgr_t *timermgr, isc_socketmgr_t *socketmgr, 202 dns_name_t *zonename, dns_rdataclass_t rdclass, 203 dns_rdatatype_t reqtype, const isc_sockaddr_t *masteraddr, 204 const isc_sockaddr_t *sourceaddr, isc_dscp_t dscp, 205 dns_tsigkey_t *tsigkey, dns_xfrin_ctx_t **xfrp); 206 207 static isc_result_t 208 axfr_init(dns_xfrin_ctx_t *xfr); 209 static isc_result_t 210 axfr_makedb(dns_xfrin_ctx_t *xfr, dns_db_t **dbp); 211 static isc_result_t 212 axfr_putdata(dns_xfrin_ctx_t *xfr, dns_diffop_t op, dns_name_t *name, 213 dns_ttl_t ttl, dns_rdata_t *rdata); 214 static isc_result_t 215 axfr_apply(dns_xfrin_ctx_t *xfr); 216 static isc_result_t 217 axfr_commit(dns_xfrin_ctx_t *xfr); 218 static isc_result_t 219 axfr_finalize(dns_xfrin_ctx_t *xfr); 220 221 static isc_result_t 222 ixfr_init(dns_xfrin_ctx_t *xfr); 223 static isc_result_t 224 ixfr_apply(dns_xfrin_ctx_t *xfr); 225 static isc_result_t 226 ixfr_putdata(dns_xfrin_ctx_t *xfr, dns_diffop_t op, dns_name_t *name, 227 dns_ttl_t ttl, dns_rdata_t *rdata); 228 static isc_result_t 229 ixfr_commit(dns_xfrin_ctx_t *xfr); 230 231 static isc_result_t 232 xfr_rr(dns_xfrin_ctx_t *xfr, dns_name_t *name, uint32_t ttl, 233 dns_rdata_t *rdata); 234 235 static isc_result_t 236 xfrin_start(dns_xfrin_ctx_t *xfr); 237 238 static void 239 xfrin_connect_done(isc_task_t *task, isc_event_t *event); 240 static isc_result_t 241 xfrin_send_request(dns_xfrin_ctx_t *xfr); 242 static void 243 xfrin_send_done(isc_task_t *task, isc_event_t *event); 244 static void 245 xfrin_recv_done(isc_task_t *task, isc_event_t *event); 246 static void 247 xfrin_timeout(isc_task_t *task, isc_event_t *event); 248 249 static void 250 maybe_free(dns_xfrin_ctx_t *xfr); 251 252 static void 253 xfrin_fail(dns_xfrin_ctx_t *xfr, isc_result_t result, const char *msg); 254 static isc_result_t 255 render(dns_message_t *msg, isc_mem_t *mctx, isc_buffer_t *buf); 256 257 static void 258 xfrin_logv(int level, const char *zonetext, const isc_sockaddr_t *masteraddr, 259 const char *fmt, va_list ap) ISC_FORMAT_PRINTF(4, 0); 260 261 static void 262 xfrin_log1(int level, const char *zonetext, const isc_sockaddr_t *masteraddr, 263 const char *fmt, ...) ISC_FORMAT_PRINTF(4, 5); 264 265 static void 266 xfrin_log(dns_xfrin_ctx_t *xfr, int level, const char *fmt, ...) 267 ISC_FORMAT_PRINTF(3, 4); 268 269 /**************************************************************************/ 270 /* 271 * AXFR handling 272 */ 273 274 static isc_result_t 275 axfr_init(dns_xfrin_ctx_t *xfr) { 276 isc_result_t result; 277 278 xfr->is_ixfr = false; 279 280 if (xfr->db != NULL) { 281 dns_db_detach(&xfr->db); 282 } 283 284 CHECK(axfr_makedb(xfr, &xfr->db)); 285 dns_rdatacallbacks_init(&xfr->axfr); 286 CHECK(dns_db_beginload(xfr->db, &xfr->axfr)); 287 result = ISC_R_SUCCESS; 288 failure: 289 return (result); 290 } 291 292 static isc_result_t 293 axfr_makedb(dns_xfrin_ctx_t *xfr, dns_db_t **dbp) { 294 isc_result_t result; 295 296 result = dns_db_create(xfr->mctx, /* XXX */ 297 "rbt", /* XXX guess */ 298 &xfr->name, dns_dbtype_zone, xfr->rdclass, 0, 299 NULL, /* XXX guess */ 300 dbp); 301 if (result == ISC_R_SUCCESS) { 302 dns_zone_rpz_enable_db(xfr->zone, *dbp); 303 dns_zone_catz_enable_db(xfr->zone, *dbp); 304 } 305 return (result); 306 } 307 308 static isc_result_t 309 axfr_putdata(dns_xfrin_ctx_t *xfr, dns_diffop_t op, dns_name_t *name, 310 dns_ttl_t ttl, dns_rdata_t *rdata) { 311 isc_result_t result; 312 313 dns_difftuple_t *tuple = NULL; 314 315 if (rdata->rdclass != xfr->rdclass) { 316 return (DNS_R_BADCLASS); 317 } 318 319 CHECK(dns_zone_checknames(xfr->zone, name, rdata)); 320 CHECK(dns_difftuple_create(xfr->diff.mctx, op, name, ttl, rdata, 321 &tuple)); 322 dns_diff_append(&xfr->diff, &tuple); 323 if (++xfr->difflen > 100) { 324 CHECK(axfr_apply(xfr)); 325 } 326 result = ISC_R_SUCCESS; 327 failure: 328 return (result); 329 } 330 331 /* 332 * Store a set of AXFR RRs in the database. 333 */ 334 static isc_result_t 335 axfr_apply(dns_xfrin_ctx_t *xfr) { 336 isc_result_t result; 337 uint64_t records; 338 339 CHECK(dns_diff_load(&xfr->diff, xfr->axfr.add, xfr->axfr.add_private)); 340 xfr->difflen = 0; 341 dns_diff_clear(&xfr->diff); 342 if (xfr->maxrecords != 0U) { 343 result = dns_db_getsize(xfr->db, xfr->ver, &records, NULL); 344 if (result == ISC_R_SUCCESS && records > xfr->maxrecords) { 345 result = DNS_R_TOOMANYRECORDS; 346 goto failure; 347 } 348 } 349 result = ISC_R_SUCCESS; 350 failure: 351 return (result); 352 } 353 354 static isc_result_t 355 axfr_commit(dns_xfrin_ctx_t *xfr) { 356 isc_result_t result; 357 358 CHECK(axfr_apply(xfr)); 359 CHECK(dns_db_endload(xfr->db, &xfr->axfr)); 360 CHECK(dns_zone_verifydb(xfr->zone, xfr->db, NULL)); 361 362 result = ISC_R_SUCCESS; 363 failure: 364 return (result); 365 } 366 367 static isc_result_t 368 axfr_finalize(dns_xfrin_ctx_t *xfr) { 369 isc_result_t result; 370 371 CHECK(dns_zone_replacedb(xfr->zone, xfr->db, true)); 372 373 result = ISC_R_SUCCESS; 374 failure: 375 return (result); 376 } 377 378 /**************************************************************************/ 379 /* 380 * IXFR handling 381 */ 382 383 static isc_result_t 384 ixfr_init(dns_xfrin_ctx_t *xfr) { 385 isc_result_t result; 386 char *journalfile; 387 388 if (xfr->reqtype != dns_rdatatype_ixfr) { 389 xfrin_log(xfr, ISC_LOG_ERROR, 390 "got incremental response to AXFR request"); 391 return (DNS_R_FORMERR); 392 } 393 394 xfr->is_ixfr = true; 395 INSIST(xfr->db != NULL); 396 xfr->difflen = 0; 397 398 journalfile = dns_zone_getjournal(xfr->zone); 399 if (journalfile != NULL) { 400 CHECK(dns_journal_open(xfr->mctx, journalfile, 401 DNS_JOURNAL_CREATE, &xfr->ixfr.journal)); 402 } 403 404 result = ISC_R_SUCCESS; 405 failure: 406 return (result); 407 } 408 409 static isc_result_t 410 ixfr_putdata(dns_xfrin_ctx_t *xfr, dns_diffop_t op, dns_name_t *name, 411 dns_ttl_t ttl, dns_rdata_t *rdata) { 412 isc_result_t result; 413 dns_difftuple_t *tuple = NULL; 414 415 if (rdata->rdclass != xfr->rdclass) { 416 return (DNS_R_BADCLASS); 417 } 418 419 if (op == DNS_DIFFOP_ADD) { 420 CHECK(dns_zone_checknames(xfr->zone, name, rdata)); 421 } 422 CHECK(dns_difftuple_create(xfr->diff.mctx, op, name, ttl, rdata, 423 &tuple)); 424 dns_diff_append(&xfr->diff, &tuple); 425 if (++xfr->difflen > 100) { 426 CHECK(ixfr_apply(xfr)); 427 } 428 result = ISC_R_SUCCESS; 429 failure: 430 return (result); 431 } 432 433 /* 434 * Apply a set of IXFR changes to the database. 435 */ 436 static isc_result_t 437 ixfr_apply(dns_xfrin_ctx_t *xfr) { 438 isc_result_t result; 439 uint64_t records; 440 441 if (xfr->ver == NULL) { 442 CHECK(dns_db_newversion(xfr->db, &xfr->ver)); 443 if (xfr->ixfr.journal != NULL) { 444 CHECK(dns_journal_begin_transaction(xfr->ixfr.journal)); 445 } 446 } 447 CHECK(dns_diff_apply(&xfr->diff, xfr->db, xfr->ver)); 448 if (xfr->maxrecords != 0U) { 449 result = dns_db_getsize(xfr->db, xfr->ver, &records, NULL); 450 if (result == ISC_R_SUCCESS && records > xfr->maxrecords) { 451 result = DNS_R_TOOMANYRECORDS; 452 goto failure; 453 } 454 } 455 if (xfr->ixfr.journal != NULL) { 456 result = dns_journal_writediff(xfr->ixfr.journal, &xfr->diff); 457 if (result != ISC_R_SUCCESS) { 458 goto failure; 459 } 460 } 461 dns_diff_clear(&xfr->diff); 462 xfr->difflen = 0; 463 result = ISC_R_SUCCESS; 464 failure: 465 return (result); 466 } 467 468 static isc_result_t 469 ixfr_commit(dns_xfrin_ctx_t *xfr) { 470 isc_result_t result; 471 472 CHECK(ixfr_apply(xfr)); 473 if (xfr->ver != NULL) { 474 CHECK(dns_zone_verifydb(xfr->zone, xfr->db, xfr->ver)); 475 /* XXX enter ready-to-commit state here */ 476 if (xfr->ixfr.journal != NULL) { 477 CHECK(dns_journal_commit(xfr->ixfr.journal)); 478 } 479 dns_db_closeversion(xfr->db, &xfr->ver, true); 480 dns_zone_markdirty(xfr->zone); 481 } 482 result = ISC_R_SUCCESS; 483 failure: 484 return (result); 485 } 486 487 /**************************************************************************/ 488 /* 489 * Common AXFR/IXFR protocol code 490 */ 491 492 /* 493 * Handle a single incoming resource record according to the current 494 * state. 495 */ 496 static isc_result_t 497 xfr_rr(dns_xfrin_ctx_t *xfr, dns_name_t *name, uint32_t ttl, 498 dns_rdata_t *rdata) { 499 isc_result_t result; 500 501 xfr->nrecs++; 502 503 if (rdata->type == dns_rdatatype_none || 504 dns_rdatatype_ismeta(rdata->type)) { 505 FAIL(DNS_R_FORMERR); 506 } 507 508 /* 509 * Immediately reject the entire transfer if the RR that is currently 510 * being processed is an SOA record that is not placed at the zone 511 * apex. 512 */ 513 if (rdata->type == dns_rdatatype_soa && 514 !dns_name_equal(&xfr->name, name)) { 515 char namebuf[DNS_NAME_FORMATSIZE]; 516 dns_name_format(name, namebuf, sizeof(namebuf)); 517 xfrin_log(xfr, ISC_LOG_DEBUG(3), "SOA name mismatch: '%s'", 518 namebuf); 519 FAIL(DNS_R_NOTZONETOP); 520 } 521 522 redo: 523 switch (xfr->state) { 524 case XFRST_SOAQUERY: 525 if (rdata->type != dns_rdatatype_soa) { 526 xfrin_log(xfr, ISC_LOG_ERROR, 527 "non-SOA response to SOA query"); 528 FAIL(DNS_R_FORMERR); 529 } 530 xfr->end_serial = dns_soa_getserial(rdata); 531 if (!DNS_SERIAL_GT(xfr->end_serial, xfr->ixfr.request_serial) && 532 !dns_zone_isforced(xfr->zone)) 533 { 534 xfrin_log(xfr, ISC_LOG_DEBUG(3), 535 "requested serial %u, " 536 "master has %u, not updating", 537 xfr->ixfr.request_serial, xfr->end_serial); 538 FAIL(DNS_R_UPTODATE); 539 } 540 xfr->state = XFRST_GOTSOA; 541 break; 542 543 case XFRST_GOTSOA: 544 /* 545 * Skip other records in the answer section. 546 */ 547 break; 548 549 case XFRST_INITIALSOA: 550 if (rdata->type != dns_rdatatype_soa) { 551 xfrin_log(xfr, ISC_LOG_ERROR, 552 "first RR in zone transfer must be SOA"); 553 FAIL(DNS_R_FORMERR); 554 } 555 /* 556 * Remember the serial number in the initial SOA. 557 * We need it to recognize the end of an IXFR. 558 */ 559 xfr->end_serial = dns_soa_getserial(rdata); 560 if (xfr->reqtype == dns_rdatatype_ixfr && 561 !DNS_SERIAL_GT(xfr->end_serial, xfr->ixfr.request_serial) && 562 !dns_zone_isforced(xfr->zone)) 563 { 564 /* 565 * This must be the single SOA record that is 566 * sent when the current version on the master 567 * is not newer than the version in the request. 568 */ 569 xfrin_log(xfr, ISC_LOG_DEBUG(3), 570 "requested serial %u, " 571 "master has %u, not updating", 572 xfr->ixfr.request_serial, xfr->end_serial); 573 FAIL(DNS_R_UPTODATE); 574 } 575 if (xfr->reqtype == dns_rdatatype_axfr) { 576 xfr->checkid = false; 577 } 578 xfr->firstsoa = *rdata; 579 if (xfr->firstsoa_data != NULL) { 580 isc_mem_free(xfr->mctx, xfr->firstsoa_data); 581 } 582 xfr->firstsoa_data = isc_mem_allocate(xfr->mctx, rdata->length); 583 memcpy(xfr->firstsoa_data, rdata->data, rdata->length); 584 xfr->firstsoa.data = xfr->firstsoa_data; 585 xfr->state = XFRST_FIRSTDATA; 586 break; 587 588 case XFRST_FIRSTDATA: 589 /* 590 * If the transfer begins with one SOA record, it is an AXFR, 591 * if it begins with two SOAs, it is an IXFR. 592 */ 593 if (xfr->reqtype == dns_rdatatype_ixfr && 594 rdata->type == dns_rdatatype_soa && 595 xfr->ixfr.request_serial == dns_soa_getserial(rdata)) 596 { 597 xfrin_log(xfr, ISC_LOG_DEBUG(3), 598 "got incremental response"); 599 CHECK(ixfr_init(xfr)); 600 xfr->state = XFRST_IXFR_DELSOA; 601 } else { 602 xfrin_log(xfr, ISC_LOG_DEBUG(3), 603 "got nonincremental response"); 604 CHECK(axfr_init(xfr)); 605 xfr->state = XFRST_AXFR; 606 } 607 goto redo; 608 609 case XFRST_IXFR_DELSOA: 610 INSIST(rdata->type == dns_rdatatype_soa); 611 CHECK(ixfr_putdata(xfr, DNS_DIFFOP_DEL, name, ttl, rdata)); 612 xfr->state = XFRST_IXFR_DEL; 613 break; 614 615 case XFRST_IXFR_DEL: 616 if (rdata->type == dns_rdatatype_soa) { 617 uint32_t soa_serial = dns_soa_getserial(rdata); 618 xfr->state = XFRST_IXFR_ADDSOA; 619 xfr->ixfr.current_serial = soa_serial; 620 goto redo; 621 } 622 CHECK(ixfr_putdata(xfr, DNS_DIFFOP_DEL, name, ttl, rdata)); 623 break; 624 625 case XFRST_IXFR_ADDSOA: 626 INSIST(rdata->type == dns_rdatatype_soa); 627 CHECK(ixfr_putdata(xfr, DNS_DIFFOP_ADD, name, ttl, rdata)); 628 xfr->state = XFRST_IXFR_ADD; 629 break; 630 631 case XFRST_IXFR_ADD: 632 if (rdata->type == dns_rdatatype_soa) { 633 uint32_t soa_serial = dns_soa_getserial(rdata); 634 if (soa_serial == xfr->end_serial) { 635 CHECK(ixfr_commit(xfr)); 636 xfr->state = XFRST_IXFR_END; 637 break; 638 } else if (soa_serial != xfr->ixfr.current_serial) { 639 xfrin_log(xfr, ISC_LOG_ERROR, 640 "IXFR out of sync: " 641 "expected serial %u, got %u", 642 xfr->ixfr.current_serial, soa_serial); 643 FAIL(DNS_R_FORMERR); 644 } else { 645 CHECK(ixfr_commit(xfr)); 646 xfr->state = XFRST_IXFR_DELSOA; 647 goto redo; 648 } 649 } 650 if (rdata->type == dns_rdatatype_ns && 651 dns_name_iswildcard(name)) { 652 FAIL(DNS_R_INVALIDNS); 653 } 654 CHECK(ixfr_putdata(xfr, DNS_DIFFOP_ADD, name, ttl, rdata)); 655 break; 656 657 case XFRST_AXFR: 658 /* 659 * Old BINDs sent cross class A records for non IN classes. 660 */ 661 if (rdata->type == dns_rdatatype_a && 662 rdata->rdclass != xfr->rdclass && 663 xfr->rdclass != dns_rdataclass_in) 664 { 665 break; 666 } 667 CHECK(axfr_putdata(xfr, DNS_DIFFOP_ADD, name, ttl, rdata)); 668 if (rdata->type == dns_rdatatype_soa) { 669 /* 670 * Use dns_rdata_compare instead of memcmp to 671 * allow for case differences. 672 */ 673 if (dns_rdata_compare(rdata, &xfr->firstsoa) != 0) { 674 xfrin_log(xfr, ISC_LOG_ERROR, 675 "start and ending SOA records " 676 "mismatch"); 677 FAIL(DNS_R_FORMERR); 678 } 679 CHECK(axfr_commit(xfr)); 680 xfr->state = XFRST_AXFR_END; 681 break; 682 } 683 break; 684 case XFRST_AXFR_END: 685 case XFRST_IXFR_END: 686 FAIL(DNS_R_EXTRADATA); 687 FALLTHROUGH; 688 default: 689 UNREACHABLE(); 690 } 691 result = ISC_R_SUCCESS; 692 failure: 693 return (result); 694 } 695 696 isc_result_t 697 dns_xfrin_create(dns_zone_t *zone, dns_rdatatype_t xfrtype, 698 const isc_sockaddr_t *masteraddr, 699 const isc_sockaddr_t *sourceaddr, isc_dscp_t dscp, 700 dns_tsigkey_t *tsigkey, isc_mem_t *mctx, 701 isc_timermgr_t *timermgr, isc_socketmgr_t *socketmgr, 702 isc_task_t *task, dns_xfrindone_t done, 703 dns_xfrin_ctx_t **xfrp) { 704 dns_name_t *zonename = dns_zone_getorigin(zone); 705 dns_xfrin_ctx_t *xfr = NULL; 706 isc_result_t result; 707 dns_db_t *db = NULL; 708 709 REQUIRE(xfrp != NULL && *xfrp == NULL); 710 711 (void)dns_zone_getdb(zone, &db); 712 713 if (xfrtype == dns_rdatatype_soa || xfrtype == dns_rdatatype_ixfr) { 714 REQUIRE(db != NULL); 715 } 716 717 CHECK(xfrin_create(mctx, zone, db, task, timermgr, socketmgr, zonename, 718 dns_zone_getclass(zone), xfrtype, masteraddr, 719 sourceaddr, dscp, tsigkey, &xfr)); 720 721 if (db != NULL) { 722 xfr->zone_had_db = true; 723 } 724 725 CHECK(xfrin_start(xfr)); 726 727 xfr->done = done; 728 if (xfr->done != NULL) { 729 xfr->refcount++; 730 } 731 *xfrp = xfr; 732 733 failure: 734 if (db != NULL) { 735 dns_db_detach(&db); 736 } 737 if (result != ISC_R_SUCCESS) { 738 char zonetext[DNS_NAME_MAXTEXT + 32]; 739 dns_zone_name(zone, zonetext, sizeof(zonetext)); 740 xfrin_log1(ISC_LOG_ERROR, zonetext, masteraddr, 741 "zone transfer setup failed"); 742 } 743 return (result); 744 } 745 746 void 747 dns_xfrin_shutdown(dns_xfrin_ctx_t *xfr) { 748 if (!xfr->shuttingdown) { 749 xfrin_fail(xfr, ISC_R_CANCELED, "shut down"); 750 } 751 } 752 753 void 754 dns_xfrin_attach(dns_xfrin_ctx_t *source, dns_xfrin_ctx_t **target) { 755 REQUIRE(target != NULL && *target == NULL); 756 source->refcount++; 757 *target = source; 758 } 759 760 void 761 dns_xfrin_detach(dns_xfrin_ctx_t **xfrp) { 762 dns_xfrin_ctx_t *xfr = *xfrp; 763 *xfrp = NULL; 764 INSIST(xfr->refcount > 0); 765 xfr->refcount--; 766 maybe_free(xfr); 767 } 768 769 static void 770 xfrin_cancelio(dns_xfrin_ctx_t *xfr) { 771 if (xfr->connects > 0) { 772 isc_socket_cancel(xfr->socket, xfr->task, 773 ISC_SOCKCANCEL_CONNECT); 774 } else if (xfr->recvs > 0) { 775 dns_tcpmsg_cancelread(&xfr->tcpmsg); 776 } else if (xfr->sends > 0) { 777 isc_socket_cancel(xfr->socket, xfr->task, ISC_SOCKCANCEL_SEND); 778 } 779 } 780 781 static void 782 xfrin_reset(dns_xfrin_ctx_t *xfr) { 783 REQUIRE(VALID_XFRIN(xfr)); 784 785 xfrin_log(xfr, ISC_LOG_INFO, "resetting"); 786 787 xfrin_cancelio(xfr); 788 789 if (xfr->socket != NULL) { 790 isc_socket_detach(&xfr->socket); 791 } 792 793 if (xfr->lasttsig != NULL) { 794 isc_buffer_free(&xfr->lasttsig); 795 } 796 797 dns_diff_clear(&xfr->diff); 798 xfr->difflen = 0; 799 800 if (xfr->ixfr.journal != NULL) { 801 dns_journal_destroy(&xfr->ixfr.journal); 802 } 803 804 if (xfr->axfr.add_private != NULL) { 805 (void)dns_db_endload(xfr->db, &xfr->axfr); 806 } 807 808 if (xfr->tcpmsg_valid) { 809 dns_tcpmsg_invalidate(&xfr->tcpmsg); 810 xfr->tcpmsg_valid = false; 811 } 812 813 if (xfr->ver != NULL) { 814 dns_db_closeversion(xfr->db, &xfr->ver, false); 815 } 816 } 817 818 static void 819 xfrin_fail(dns_xfrin_ctx_t *xfr, isc_result_t result, const char *msg) { 820 if (result != DNS_R_UPTODATE && result != DNS_R_TOOMANYRECORDS) { 821 xfrin_log(xfr, ISC_LOG_ERROR, "%s: %s", msg, 822 isc_result_totext(result)); 823 if (xfr->is_ixfr) { 824 /* Pass special result code to force AXFR retry */ 825 result = DNS_R_BADIXFR; 826 } 827 } 828 xfrin_cancelio(xfr); 829 /* 830 * Close the journal. 831 */ 832 if (xfr->ixfr.journal != NULL) { 833 dns_journal_destroy(&xfr->ixfr.journal); 834 } 835 if (xfr->done != NULL) { 836 (xfr->done)(xfr->zone, result); 837 xfr->done = NULL; 838 } 839 xfr->shuttingdown = true; 840 xfr->shutdown_result = result; 841 maybe_free(xfr); 842 } 843 844 static isc_result_t 845 xfrin_create(isc_mem_t *mctx, dns_zone_t *zone, dns_db_t *db, isc_task_t *task, 846 isc_timermgr_t *timermgr, isc_socketmgr_t *socketmgr, 847 dns_name_t *zonename, dns_rdataclass_t rdclass, 848 dns_rdatatype_t reqtype, const isc_sockaddr_t *masteraddr, 849 const isc_sockaddr_t *sourceaddr, isc_dscp_t dscp, 850 dns_tsigkey_t *tsigkey, dns_xfrin_ctx_t **xfrp) { 851 dns_xfrin_ctx_t *xfr = NULL; 852 isc_result_t result; 853 854 xfr = isc_mem_get(mctx, sizeof(*xfr)); 855 xfr->mctx = NULL; 856 isc_mem_attach(mctx, &xfr->mctx); 857 xfr->refcount = 0; 858 xfr->zone = NULL; 859 dns_zone_iattach(zone, &xfr->zone); 860 xfr->task = NULL; 861 isc_task_attach(task, &xfr->task); 862 xfr->timer = NULL; 863 xfr->socketmgr = socketmgr; 864 xfr->done = NULL; 865 866 xfr->connects = 0; 867 xfr->sends = 0; 868 xfr->recvs = 0; 869 xfr->shuttingdown = false; 870 xfr->shutdown_result = ISC_R_UNSET; 871 872 dns_name_init(&xfr->name, NULL); 873 xfr->rdclass = rdclass; 874 xfr->checkid = true; 875 xfr->logit = true; 876 xfr->id = (dns_messageid_t)isc_random16(); 877 xfr->reqtype = reqtype; 878 xfr->dscp = dscp; 879 880 /* sockaddr */ 881 xfr->socket = NULL; 882 /* qbuffer */ 883 /* qbuffer_data */ 884 /* tcpmsg */ 885 xfr->tcpmsg_valid = false; 886 887 xfr->zone_had_db = false; 888 xfr->db = NULL; 889 if (db != NULL) { 890 dns_db_attach(db, &xfr->db); 891 } 892 xfr->ver = NULL; 893 dns_diff_init(xfr->mctx, &xfr->diff); 894 xfr->difflen = 0; 895 896 if (reqtype == dns_rdatatype_soa) { 897 xfr->state = XFRST_SOAQUERY; 898 } else { 899 xfr->state = XFRST_INITIALSOA; 900 } 901 /* end_serial */ 902 903 xfr->nmsg = 0; 904 xfr->nrecs = 0; 905 xfr->nbytes = 0; 906 xfr->maxrecords = dns_zone_getmaxrecords(zone); 907 isc_time_now(&xfr->start); 908 909 xfr->tsigkey = NULL; 910 if (tsigkey != NULL) { 911 dns_tsigkey_attach(tsigkey, &xfr->tsigkey); 912 } 913 xfr->lasttsig = NULL; 914 xfr->tsigctx = NULL; 915 xfr->sincetsig = 0; 916 xfr->is_ixfr = false; 917 918 /* ixfr.request_serial */ 919 /* ixfr.current_serial */ 920 xfr->ixfr.journal = NULL; 921 922 xfr->axfr.add = NULL; 923 xfr->axfr.add_private = NULL; 924 dns_rdata_init(&xfr->firstsoa); 925 xfr->firstsoa_data = NULL; 926 927 dns_name_dup(zonename, mctx, &xfr->name); 928 929 CHECK(isc_timer_create(timermgr, isc_timertype_inactive, NULL, NULL, 930 task, xfrin_timeout, xfr, &xfr->timer)); 931 CHECK(dns_timer_setidle(xfr->timer, dns_zone_getmaxxfrin(xfr->zone), 932 dns_zone_getidlein(xfr->zone), false)); 933 934 xfr->masteraddr = *masteraddr; 935 936 INSIST(isc_sockaddr_pf(masteraddr) == isc_sockaddr_pf(sourceaddr)); 937 xfr->sourceaddr = *sourceaddr; 938 isc_sockaddr_setport(&xfr->sourceaddr, 0); 939 940 /* 941 * Reserve 2 bytes for TCP length at the beginning of the buffer. 942 */ 943 isc_buffer_init(&xfr->qbuffer, &xfr->qbuffer_data[2], 944 sizeof(xfr->qbuffer_data) - 2); 945 946 xfr->magic = XFRIN_MAGIC; 947 *xfrp = xfr; 948 return (ISC_R_SUCCESS); 949 950 failure: 951 if (xfr->timer != NULL) { 952 isc_timer_detach(&xfr->timer); 953 } 954 if (dns_name_dynamic(&xfr->name)) { 955 dns_name_free(&xfr->name, xfr->mctx); 956 } 957 if (xfr->tsigkey != NULL) { 958 dns_tsigkey_detach(&xfr->tsigkey); 959 } 960 if (xfr->db != NULL) { 961 dns_db_detach(&xfr->db); 962 } 963 isc_task_detach(&xfr->task); 964 dns_zone_idetach(&xfr->zone); 965 isc_mem_putanddetach(&xfr->mctx, xfr, sizeof(*xfr)); 966 967 return (result); 968 } 969 970 static isc_result_t 971 xfrin_start(dns_xfrin_ctx_t *xfr) { 972 isc_result_t result; 973 CHECK(isc_socket_create(xfr->socketmgr, 974 isc_sockaddr_pf(&xfr->sourceaddr), 975 isc_sockettype_tcp, &xfr->socket)); 976 isc_socket_setname(xfr->socket, "xfrin", NULL); 977 #ifndef BROKEN_TCP_BIND_BEFORE_CONNECT 978 CHECK(isc_socket_bind(xfr->socket, &xfr->sourceaddr, 979 ISC_SOCKET_REUSEADDRESS)); 980 #endif /* ifndef BROKEN_TCP_BIND_BEFORE_CONNECT */ 981 isc_socket_dscp(xfr->socket, xfr->dscp); 982 CHECK(isc_socket_connect(xfr->socket, &xfr->masteraddr, xfr->task, 983 xfrin_connect_done, xfr)); 984 xfr->connects++; 985 return (ISC_R_SUCCESS); 986 failure: 987 xfrin_fail(xfr, result, "failed setting up socket"); 988 return (result); 989 } 990 991 /* XXX the resolver could use this, too */ 992 993 static isc_result_t 994 render(dns_message_t *msg, isc_mem_t *mctx, isc_buffer_t *buf) { 995 dns_compress_t cctx; 996 bool cleanup_cctx = false; 997 isc_result_t result; 998 999 CHECK(dns_compress_init(&cctx, -1, mctx)); 1000 cleanup_cctx = true; 1001 CHECK(dns_message_renderbegin(msg, &cctx, buf)); 1002 CHECK(dns_message_rendersection(msg, DNS_SECTION_QUESTION, 0)); 1003 CHECK(dns_message_rendersection(msg, DNS_SECTION_ANSWER, 0)); 1004 CHECK(dns_message_rendersection(msg, DNS_SECTION_AUTHORITY, 0)); 1005 CHECK(dns_message_rendersection(msg, DNS_SECTION_ADDITIONAL, 0)); 1006 CHECK(dns_message_renderend(msg)); 1007 result = ISC_R_SUCCESS; 1008 failure: 1009 if (cleanup_cctx) { 1010 dns_compress_invalidate(&cctx); 1011 } 1012 return (result); 1013 } 1014 1015 /* 1016 * A connection has been established. 1017 */ 1018 static void 1019 xfrin_connect_done(isc_task_t *task, isc_event_t *event) { 1020 isc_socket_connev_t *cev = (isc_socket_connev_t *)event; 1021 dns_xfrin_ctx_t *xfr = (dns_xfrin_ctx_t *)event->ev_arg; 1022 isc_result_t result = cev->result; 1023 char sourcetext[ISC_SOCKADDR_FORMATSIZE]; 1024 char signerbuf[DNS_NAME_FORMATSIZE]; 1025 const char *signer = "", *sep = ""; 1026 isc_sockaddr_t sockaddr; 1027 dns_zonemgr_t *zmgr; 1028 isc_time_t now; 1029 1030 REQUIRE(VALID_XFRIN(xfr)); 1031 1032 UNUSED(task); 1033 1034 INSIST(event->ev_type == ISC_SOCKEVENT_CONNECT); 1035 isc_event_free(&event); 1036 1037 xfr->connects--; 1038 if (xfr->shuttingdown) { 1039 maybe_free(xfr); 1040 return; 1041 } 1042 1043 zmgr = dns_zone_getmgr(xfr->zone); 1044 if (zmgr != NULL) { 1045 if (result != ISC_R_SUCCESS) { 1046 TIME_NOW(&now); 1047 dns_zonemgr_unreachableadd(zmgr, &xfr->masteraddr, 1048 &xfr->sourceaddr, &now); 1049 goto failure; 1050 } else { 1051 dns_zonemgr_unreachabledel(zmgr, &xfr->masteraddr, 1052 &xfr->sourceaddr); 1053 } 1054 } 1055 1056 result = isc_socket_getsockname(xfr->socket, &sockaddr); 1057 if (result == ISC_R_SUCCESS) { 1058 isc_sockaddr_format(&sockaddr, sourcetext, sizeof(sourcetext)); 1059 } else { 1060 strlcpy(sourcetext, "<UNKNOWN>", sizeof(sourcetext)); 1061 } 1062 1063 if (xfr->tsigkey != NULL && xfr->tsigkey->key != NULL) { 1064 dns_name_format(dst_key_name(xfr->tsigkey->key), signerbuf, 1065 sizeof(signerbuf)); 1066 sep = " TSIG "; 1067 signer = signerbuf; 1068 } 1069 1070 xfrin_log(xfr, ISC_LOG_INFO, "connected using %s%s%s", sourcetext, sep, 1071 signer); 1072 1073 dns_tcpmsg_init(xfr->mctx, xfr->socket, &xfr->tcpmsg); 1074 xfr->tcpmsg_valid = true; 1075 1076 CHECK(xfrin_send_request(xfr)); 1077 failure: 1078 if (result != ISC_R_SUCCESS) { 1079 xfrin_fail(xfr, result, "failed to connect"); 1080 } 1081 } 1082 1083 /* 1084 * Convert a tuple into a dns_name_t suitable for inserting 1085 * into the given dns_message_t. 1086 */ 1087 static isc_result_t 1088 tuple2msgname(dns_difftuple_t *tuple, dns_message_t *msg, dns_name_t **target) { 1089 isc_result_t result; 1090 dns_rdata_t *rdata = NULL; 1091 dns_rdatalist_t *rdl = NULL; 1092 dns_rdataset_t *rds = NULL; 1093 dns_name_t *name = NULL; 1094 1095 REQUIRE(target != NULL && *target == NULL); 1096 1097 CHECK(dns_message_gettemprdata(msg, &rdata)); 1098 dns_rdata_init(rdata); 1099 dns_rdata_clone(&tuple->rdata, rdata); 1100 1101 CHECK(dns_message_gettemprdatalist(msg, &rdl)); 1102 dns_rdatalist_init(rdl); 1103 rdl->type = tuple->rdata.type; 1104 rdl->rdclass = tuple->rdata.rdclass; 1105 rdl->ttl = tuple->ttl; 1106 ISC_LIST_APPEND(rdl->rdata, rdata, link); 1107 1108 CHECK(dns_message_gettemprdataset(msg, &rds)); 1109 CHECK(dns_rdatalist_tordataset(rdl, rds)); 1110 1111 CHECK(dns_message_gettempname(msg, &name)); 1112 dns_name_clone(&tuple->name, name); 1113 ISC_LIST_APPEND(name->list, rds, link); 1114 1115 *target = name; 1116 return (ISC_R_SUCCESS); 1117 1118 failure: 1119 1120 if (rds != NULL) { 1121 dns_rdataset_disassociate(rds); 1122 dns_message_puttemprdataset(msg, &rds); 1123 } 1124 if (rdl != NULL) { 1125 ISC_LIST_UNLINK(rdl->rdata, rdata, link); 1126 dns_message_puttemprdatalist(msg, &rdl); 1127 } 1128 if (rdata != NULL) { 1129 dns_message_puttemprdata(msg, &rdata); 1130 } 1131 1132 return (result); 1133 } 1134 1135 /* 1136 * Build an *XFR request and send its length prefix. 1137 */ 1138 static isc_result_t 1139 xfrin_send_request(dns_xfrin_ctx_t *xfr) { 1140 isc_result_t result; 1141 isc_region_t region; 1142 dns_rdataset_t *qrdataset = NULL; 1143 dns_message_t *msg = NULL; 1144 dns_difftuple_t *soatuple = NULL; 1145 dns_name_t *qname = NULL; 1146 dns_dbversion_t *ver = NULL; 1147 dns_name_t *msgsoaname = NULL; 1148 1149 /* Create the request message */ 1150 dns_message_create(xfr->mctx, DNS_MESSAGE_INTENTRENDER, &msg); 1151 CHECK(dns_message_settsigkey(msg, xfr->tsigkey)); 1152 1153 /* Create a name for the question section. */ 1154 CHECK(dns_message_gettempname(msg, &qname)); 1155 dns_name_clone(&xfr->name, qname); 1156 1157 /* Formulate the question and attach it to the question name. */ 1158 CHECK(dns_message_gettemprdataset(msg, &qrdataset)); 1159 dns_rdataset_makequestion(qrdataset, xfr->rdclass, xfr->reqtype); 1160 ISC_LIST_APPEND(qname->list, qrdataset, link); 1161 qrdataset = NULL; 1162 1163 dns_message_addname(msg, qname, DNS_SECTION_QUESTION); 1164 qname = NULL; 1165 1166 if (xfr->reqtype == dns_rdatatype_ixfr) { 1167 /* Get the SOA and add it to the authority section. */ 1168 /* XXX is using the current version the right thing? */ 1169 dns_db_currentversion(xfr->db, &ver); 1170 CHECK(dns_db_createsoatuple(xfr->db, ver, xfr->mctx, 1171 DNS_DIFFOP_EXISTS, &soatuple)); 1172 xfr->ixfr.request_serial = dns_soa_getserial(&soatuple->rdata); 1173 xfr->ixfr.current_serial = xfr->ixfr.request_serial; 1174 xfrin_log(xfr, ISC_LOG_DEBUG(3), 1175 "requesting IXFR for serial %u", 1176 xfr->ixfr.request_serial); 1177 1178 CHECK(tuple2msgname(soatuple, msg, &msgsoaname)); 1179 dns_message_addname(msg, msgsoaname, DNS_SECTION_AUTHORITY); 1180 } else if (xfr->reqtype == dns_rdatatype_soa) { 1181 CHECK(dns_db_getsoaserial(xfr->db, NULL, 1182 &xfr->ixfr.request_serial)); 1183 } 1184 1185 xfr->checkid = true; 1186 xfr->logit = true; 1187 xfr->id++; 1188 xfr->nmsg = 0; 1189 xfr->nrecs = 0; 1190 xfr->nbytes = 0; 1191 isc_time_now(&xfr->start); 1192 msg->id = xfr->id; 1193 if (xfr->tsigctx != NULL) { 1194 dst_context_destroy(&xfr->tsigctx); 1195 } 1196 1197 CHECK(render(msg, xfr->mctx, &xfr->qbuffer)); 1198 1199 /* 1200 * Free the last tsig, if there is one. 1201 */ 1202 if (xfr->lasttsig != NULL) { 1203 isc_buffer_free(&xfr->lasttsig); 1204 } 1205 1206 /* 1207 * Save the query TSIG and don't let message_destroy free it. 1208 */ 1209 CHECK(dns_message_getquerytsig(msg, xfr->mctx, &xfr->lasttsig)); 1210 1211 isc_buffer_usedregion(&xfr->qbuffer, ®ion); 1212 INSIST(region.length <= 65535); 1213 1214 /* 1215 * Record message length and adjust region to include TCP 1216 * length field. 1217 */ 1218 xfr->qbuffer_data[0] = (region.length >> 8) & 0xff; 1219 xfr->qbuffer_data[1] = region.length & 0xff; 1220 region.base -= 2; 1221 region.length += 2; 1222 CHECK(isc_socket_send(xfr->socket, ®ion, xfr->task, xfrin_send_done, 1223 xfr)); 1224 xfr->sends++; 1225 1226 failure: 1227 if (qname != NULL) { 1228 dns_message_puttempname(msg, &qname); 1229 } 1230 if (qrdataset != NULL) { 1231 dns_message_puttemprdataset(msg, &qrdataset); 1232 } 1233 if (msg != NULL) { 1234 dns_message_detach(&msg); 1235 } 1236 if (soatuple != NULL) { 1237 dns_difftuple_free(&soatuple); 1238 } 1239 if (ver != NULL) { 1240 dns_db_closeversion(xfr->db, &ver, false); 1241 } 1242 return (result); 1243 } 1244 1245 static void 1246 xfrin_send_done(isc_task_t *task, isc_event_t *event) { 1247 isc_socketevent_t *sev = (isc_socketevent_t *)event; 1248 dns_xfrin_ctx_t *xfr = (dns_xfrin_ctx_t *)event->ev_arg; 1249 isc_result_t result; 1250 1251 REQUIRE(VALID_XFRIN(xfr)); 1252 1253 UNUSED(task); 1254 1255 INSIST(event->ev_type == ISC_SOCKEVENT_SENDDONE); 1256 1257 xfr->sends--; 1258 xfrin_log(xfr, ISC_LOG_DEBUG(3), "sent request data"); 1259 CHECK(sev->result); 1260 1261 CHECK(dns_tcpmsg_readmessage(&xfr->tcpmsg, xfr->task, xfrin_recv_done, 1262 xfr)); 1263 xfr->recvs++; 1264 failure: 1265 isc_event_free(&event); 1266 if (result != ISC_R_SUCCESS) { 1267 xfrin_fail(xfr, result, "failed sending request data"); 1268 } 1269 } 1270 1271 static void 1272 xfrin_recv_done(isc_task_t *task, isc_event_t *ev) { 1273 dns_xfrin_ctx_t *xfr = (dns_xfrin_ctx_t *)ev->ev_arg; 1274 isc_result_t result; 1275 dns_message_t *msg = NULL; 1276 dns_name_t *name; 1277 dns_tcpmsg_t *tcpmsg; 1278 const dns_name_t *tsigowner = NULL; 1279 1280 REQUIRE(VALID_XFRIN(xfr)); 1281 1282 UNUSED(task); 1283 1284 INSIST(ev->ev_type == DNS_EVENT_TCPMSG); 1285 tcpmsg = ev->ev_sender; 1286 isc_event_free(&ev); 1287 1288 xfr->recvs--; 1289 if (xfr->shuttingdown) { 1290 maybe_free(xfr); 1291 return; 1292 } 1293 1294 CHECK(tcpmsg->result); 1295 1296 xfrin_log(xfr, ISC_LOG_DEBUG(7), "received %u bytes", 1297 tcpmsg->buffer.used); 1298 1299 CHECK(isc_timer_touch(xfr->timer)); 1300 1301 dns_message_create(xfr->mctx, DNS_MESSAGE_INTENTPARSE, &msg); 1302 1303 CHECK(dns_message_settsigkey(msg, xfr->tsigkey)); 1304 CHECK(dns_message_setquerytsig(msg, xfr->lasttsig)); 1305 1306 msg->tsigctx = xfr->tsigctx; 1307 xfr->tsigctx = NULL; 1308 1309 dns_message_setclass(msg, xfr->rdclass); 1310 1311 if (xfr->nmsg > 0) { 1312 msg->tcp_continuation = 1; 1313 } 1314 1315 result = dns_message_parse(msg, &tcpmsg->buffer, 1316 DNS_MESSAGEPARSE_PRESERVEORDER); 1317 1318 if (result == ISC_R_SUCCESS) { 1319 dns_message_logpacket(msg, "received message from", 1320 &tcpmsg->address, DNS_LOGCATEGORY_XFER_IN, 1321 DNS_LOGMODULE_XFER_IN, ISC_LOG_DEBUG(10), 1322 xfr->mctx); 1323 } else { 1324 xfrin_log(xfr, ISC_LOG_DEBUG(10), "dns_message_parse: %s", 1325 dns_result_totext(result)); 1326 } 1327 1328 if (result != ISC_R_SUCCESS || msg->rcode != dns_rcode_noerror || 1329 msg->opcode != dns_opcode_query || msg->rdclass != xfr->rdclass || 1330 (xfr->checkid && msg->id != xfr->id)) 1331 { 1332 if (result == ISC_R_SUCCESS && msg->rcode != dns_rcode_noerror) 1333 { 1334 result = ISC_RESULTCLASS_DNSRCODE + msg->rcode; /*XXX*/ 1335 } else if (result == ISC_R_SUCCESS && 1336 msg->opcode != dns_opcode_query) { 1337 result = DNS_R_UNEXPECTEDOPCODE; 1338 } else if (result == ISC_R_SUCCESS && 1339 msg->rdclass != xfr->rdclass) { 1340 result = DNS_R_BADCLASS; 1341 } else if (result == ISC_R_SUCCESS || result == DNS_R_NOERROR) { 1342 result = DNS_R_UNEXPECTEDID; 1343 } 1344 if (xfr->reqtype == dns_rdatatype_axfr || 1345 xfr->reqtype == dns_rdatatype_soa) { 1346 goto failure; 1347 } 1348 xfrin_log(xfr, ISC_LOG_DEBUG(3), "got %s, retrying with AXFR", 1349 isc_result_totext(result)); 1350 try_axfr: 1351 dns_message_detach(&msg); 1352 xfrin_reset(xfr); 1353 xfr->reqtype = dns_rdatatype_soa; 1354 xfr->state = XFRST_SOAQUERY; 1355 (void)xfrin_start(xfr); 1356 return; 1357 } else if (!xfr->checkid && msg->id != xfr->id && xfr->logit) { 1358 xfrin_log(xfr, ISC_LOG_WARNING, 1359 "detected message ID mismatch on incoming AXFR " 1360 "stream, transfer will fail in BIND 9.17.2 and " 1361 "later if AXFR source is not fixed"); 1362 xfr->logit = false; 1363 } 1364 1365 /* 1366 * Does the server know about IXFR? If it doesn't we will get 1367 * a message with a empty answer section or a potentially a CNAME / 1368 * DNAME, the later is handled by xfr_rr() which will return FORMERR 1369 * if the first RR in the answer section is not a SOA record. 1370 */ 1371 if (xfr->reqtype == dns_rdatatype_ixfr && 1372 xfr->state == XFRST_INITIALSOA && 1373 msg->counts[DNS_SECTION_ANSWER] == 0) 1374 { 1375 xfrin_log(xfr, ISC_LOG_DEBUG(3), 1376 "empty answer section, retrying with AXFR"); 1377 goto try_axfr; 1378 } 1379 1380 if (xfr->reqtype == dns_rdatatype_soa && 1381 (msg->flags & DNS_MESSAGEFLAG_AA) == 0) { 1382 FAIL(DNS_R_NOTAUTHORITATIVE); 1383 } 1384 1385 result = dns_message_checksig(msg, dns_zone_getview(xfr->zone)); 1386 if (result != ISC_R_SUCCESS) { 1387 xfrin_log(xfr, ISC_LOG_DEBUG(3), "TSIG check failed: %s", 1388 isc_result_totext(result)); 1389 goto failure; 1390 } 1391 1392 for (result = dns_message_firstname(msg, DNS_SECTION_ANSWER); 1393 result == ISC_R_SUCCESS; 1394 result = dns_message_nextname(msg, DNS_SECTION_ANSWER)) 1395 { 1396 dns_rdataset_t *rds; 1397 1398 name = NULL; 1399 dns_message_currentname(msg, DNS_SECTION_ANSWER, &name); 1400 for (rds = ISC_LIST_HEAD(name->list); rds != NULL; 1401 rds = ISC_LIST_NEXT(rds, link)) 1402 { 1403 for (result = dns_rdataset_first(rds); 1404 result == ISC_R_SUCCESS; 1405 result = dns_rdataset_next(rds)) 1406 { 1407 dns_rdata_t rdata = DNS_RDATA_INIT; 1408 dns_rdataset_current(rds, &rdata); 1409 CHECK(xfr_rr(xfr, name, rds->ttl, &rdata)); 1410 } 1411 } 1412 } 1413 if (result != ISC_R_NOMORE) { 1414 goto failure; 1415 } 1416 1417 if (dns_message_gettsig(msg, &tsigowner) != NULL) { 1418 /* 1419 * Reset the counter. 1420 */ 1421 xfr->sincetsig = 0; 1422 1423 /* 1424 * Free the last tsig, if there is one. 1425 */ 1426 if (xfr->lasttsig != NULL) { 1427 isc_buffer_free(&xfr->lasttsig); 1428 } 1429 1430 /* 1431 * Update the last tsig pointer. 1432 */ 1433 CHECK(dns_message_getquerytsig(msg, xfr->mctx, &xfr->lasttsig)); 1434 } else if (dns_message_gettsigkey(msg) != NULL) { 1435 xfr->sincetsig++; 1436 if (xfr->sincetsig > 100 || xfr->nmsg == 0 || 1437 xfr->state == XFRST_AXFR_END || 1438 xfr->state == XFRST_IXFR_END) 1439 { 1440 result = DNS_R_EXPECTEDTSIG; 1441 goto failure; 1442 } 1443 } 1444 1445 /* 1446 * Update the number of messages received. 1447 */ 1448 xfr->nmsg++; 1449 1450 /* 1451 * Update the number of bytes received. 1452 */ 1453 xfr->nbytes += tcpmsg->buffer.used; 1454 1455 /* 1456 * Take the context back. 1457 */ 1458 INSIST(xfr->tsigctx == NULL); 1459 xfr->tsigctx = msg->tsigctx; 1460 msg->tsigctx = NULL; 1461 1462 dns_message_detach(&msg); 1463 1464 switch (xfr->state) { 1465 case XFRST_GOTSOA: 1466 xfr->reqtype = dns_rdatatype_axfr; 1467 xfr->state = XFRST_INITIALSOA; 1468 CHECK(xfrin_send_request(xfr)); 1469 break; 1470 case XFRST_AXFR_END: 1471 CHECK(axfr_finalize(xfr)); 1472 FALLTHROUGH; 1473 case XFRST_IXFR_END: 1474 /* 1475 * Close the journal. 1476 */ 1477 if (xfr->ixfr.journal != NULL) { 1478 dns_journal_destroy(&xfr->ixfr.journal); 1479 } 1480 1481 /* 1482 * Inform the caller we succeeded. 1483 */ 1484 if (xfr->done != NULL) { 1485 (xfr->done)(xfr->zone, ISC_R_SUCCESS); 1486 xfr->done = NULL; 1487 } 1488 /* 1489 * We should have no outstanding events at this 1490 * point, thus maybe_free() should succeed. 1491 */ 1492 xfr->shuttingdown = true; 1493 xfr->shutdown_result = ISC_R_SUCCESS; 1494 maybe_free(xfr); 1495 break; 1496 default: 1497 /* 1498 * Read the next message. 1499 */ 1500 CHECK(dns_tcpmsg_readmessage(&xfr->tcpmsg, xfr->task, 1501 xfrin_recv_done, xfr)); 1502 xfr->recvs++; 1503 } 1504 return; 1505 1506 failure: 1507 if (msg != NULL) { 1508 dns_message_detach(&msg); 1509 } 1510 if (result != ISC_R_SUCCESS) { 1511 xfrin_fail(xfr, result, "failed while receiving responses"); 1512 } 1513 } 1514 1515 static void 1516 xfrin_timeout(isc_task_t *task, isc_event_t *event) { 1517 dns_xfrin_ctx_t *xfr = (dns_xfrin_ctx_t *)event->ev_arg; 1518 1519 REQUIRE(VALID_XFRIN(xfr)); 1520 1521 UNUSED(task); 1522 1523 isc_event_free(&event); 1524 /* 1525 * This will log "giving up: timeout". 1526 */ 1527 xfrin_fail(xfr, ISC_R_TIMEDOUT, "giving up"); 1528 } 1529 1530 static void 1531 maybe_free(dns_xfrin_ctx_t *xfr) { 1532 uint64_t msecs; 1533 uint64_t persec; 1534 const char *result_str; 1535 1536 REQUIRE(VALID_XFRIN(xfr)); 1537 1538 if (!xfr->shuttingdown || xfr->refcount != 0 || xfr->connects != 0 || 1539 xfr->sends != 0 || xfr->recvs != 0) 1540 { 1541 return; 1542 } 1543 1544 INSIST(!xfr->shuttingdown || xfr->shutdown_result != ISC_R_UNSET); 1545 1546 /* If we're called through dns_xfrin_detach() and are not 1547 * shutting down, we can't know what the transfer status is as 1548 * we are only called when the last reference is lost. 1549 */ 1550 result_str = (xfr->shuttingdown 1551 ? isc_result_totext(xfr->shutdown_result) 1552 : "unknown"); 1553 xfrin_log(xfr, ISC_LOG_INFO, "Transfer status: %s", result_str); 1554 1555 /* 1556 * Calculate the length of time the transfer took, 1557 * and print a log message with the bytes and rate. 1558 */ 1559 isc_time_now(&xfr->end); 1560 msecs = isc_time_microdiff(&xfr->end, &xfr->start) / 1000; 1561 if (msecs == 0) { 1562 msecs = 1; 1563 } 1564 persec = (xfr->nbytes * 1000) / msecs; 1565 xfrin_log(xfr, ISC_LOG_INFO, 1566 "Transfer completed: %d messages, %d records, " 1567 "%" PRIu64 " bytes, " 1568 "%u.%03u secs (%u bytes/sec) (serial %u)", 1569 xfr->nmsg, xfr->nrecs, xfr->nbytes, 1570 (unsigned int)(msecs / 1000), (unsigned int)(msecs % 1000), 1571 (unsigned int)persec, xfr->end_serial); 1572 1573 if (xfr->socket != NULL) { 1574 isc_socket_detach(&xfr->socket); 1575 } 1576 1577 if (xfr->timer != NULL) { 1578 isc_timer_detach(&xfr->timer); 1579 } 1580 1581 if (xfr->task != NULL) { 1582 isc_task_detach(&xfr->task); 1583 } 1584 1585 if (xfr->tsigkey != NULL) { 1586 dns_tsigkey_detach(&xfr->tsigkey); 1587 } 1588 1589 if (xfr->lasttsig != NULL) { 1590 isc_buffer_free(&xfr->lasttsig); 1591 } 1592 1593 dns_diff_clear(&xfr->diff); 1594 1595 if (xfr->ixfr.journal != NULL) { 1596 dns_journal_destroy(&xfr->ixfr.journal); 1597 } 1598 1599 if (xfr->axfr.add_private != NULL) { 1600 (void)dns_db_endload(xfr->db, &xfr->axfr); 1601 } 1602 1603 if (xfr->tcpmsg_valid) { 1604 dns_tcpmsg_invalidate(&xfr->tcpmsg); 1605 } 1606 1607 if (xfr->tsigctx != NULL) { 1608 dst_context_destroy(&xfr->tsigctx); 1609 } 1610 1611 if ((xfr->name.attributes & DNS_NAMEATTR_DYNAMIC) != 0) { 1612 dns_name_free(&xfr->name, xfr->mctx); 1613 } 1614 1615 if (xfr->ver != NULL) { 1616 dns_db_closeversion(xfr->db, &xfr->ver, false); 1617 } 1618 1619 if (xfr->db != NULL) { 1620 dns_db_detach(&xfr->db); 1621 } 1622 1623 if (xfr->zone != NULL) { 1624 if (!xfr->zone_had_db && xfr->shuttingdown && 1625 xfr->shutdown_result == ISC_R_SUCCESS && 1626 dns_zone_gettype(xfr->zone) == dns_zone_mirror) 1627 { 1628 dns_zone_log(xfr->zone, ISC_LOG_INFO, 1629 "mirror zone is now in use"); 1630 } 1631 xfrin_log(xfr, ISC_LOG_DEBUG(99), "freeing transfer context"); 1632 /* 1633 * xfr->zone must not be detached before xfrin_log() is called. 1634 */ 1635 dns_zone_idetach(&xfr->zone); 1636 } 1637 1638 if (xfr->firstsoa_data != NULL) { 1639 isc_mem_free(xfr->mctx, xfr->firstsoa_data); 1640 } 1641 1642 isc_mem_putanddetach(&xfr->mctx, xfr, sizeof(*xfr)); 1643 } 1644 1645 /* 1646 * Log incoming zone transfer messages in a format like 1647 * transfer of <zone> from <address>: <message> 1648 */ 1649 static void 1650 xfrin_logv(int level, const char *zonetext, const isc_sockaddr_t *masteraddr, 1651 const char *fmt, va_list ap) { 1652 char mastertext[ISC_SOCKADDR_FORMATSIZE]; 1653 char msgtext[2048]; 1654 1655 isc_sockaddr_format(masteraddr, mastertext, sizeof(mastertext)); 1656 vsnprintf(msgtext, sizeof(msgtext), fmt, ap); 1657 1658 isc_log_write(dns_lctx, DNS_LOGCATEGORY_XFER_IN, DNS_LOGMODULE_XFER_IN, 1659 level, "transfer of '%s' from %s: %s", zonetext, 1660 mastertext, msgtext); 1661 } 1662 1663 /* 1664 * Logging function for use when a xfrin_ctx_t has not yet been created. 1665 */ 1666 1667 static void 1668 xfrin_log1(int level, const char *zonetext, const isc_sockaddr_t *masteraddr, 1669 const char *fmt, ...) { 1670 va_list ap; 1671 1672 if (!isc_log_wouldlog(dns_lctx, level)) { 1673 return; 1674 } 1675 1676 va_start(ap, fmt); 1677 xfrin_logv(level, zonetext, masteraddr, fmt, ap); 1678 va_end(ap); 1679 } 1680 1681 /* 1682 * Logging function for use when there is a xfrin_ctx_t. 1683 */ 1684 1685 static void 1686 xfrin_log(dns_xfrin_ctx_t *xfr, int level, const char *fmt, ...) { 1687 va_list ap; 1688 char zonetext[DNS_NAME_MAXTEXT + 32]; 1689 1690 if (!isc_log_wouldlog(dns_lctx, level)) { 1691 return; 1692 } 1693 1694 dns_zone_name(xfr->zone, zonetext, sizeof(zonetext)); 1695 1696 va_start(ap, fmt); 1697 xfrin_logv(level, zonetext, &xfr->masteraddr, fmt, ap); 1698 va_end(ap); 1699 } 1700
Indexes created Tue Mar 24 00:24:13 UTC 2026