1 /* $NetBSD: conn.c,v 1.4 2025/09/05 21:16:28 christos Exp $ */ 2 3 /* $OpenLDAP$ */ 4 /* This work is part of OpenLDAP Software <http://www.openldap.org/>. 5 * 6 * Copyright 1999-2024 The OpenLDAP Foundation. 7 * Portions Copyright 2001-2003 Pierangelo Masarati. 8 * Portions Copyright 1999-2003 Howard Chu. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted only as authorized by the OpenLDAP 13 * Public License. 14 * 15 * A copy of this license is available in the file LICENSE in the 16 * top-level directory of the distribution or, alternatively, at 17 * <http://www.OpenLDAP.org/license.html>. 18 */ 19 /* ACKNOWLEDGEMENTS: 20 * This work was initially developed by the Howard Chu for inclusion 21 * in OpenLDAP Software and subsequently enhanced by Pierangelo 22 * Masarati. 23 */ 24 25 #include <sys/cdefs.h> 26 __RCSID("$NetBSD: conn.c,v 1.4 2025/09/05 21:16:28 christos Exp $"); 27 28 #include "portable.h" 29 30 #include <stdio.h> 31 32 #include <ac/errno.h> 33 #include <ac/socket.h> 34 #include <ac/string.h> 35 36 37 #define AVL_INTERNAL 38 #include "slap.h" 39 #include "../back-ldap/back-ldap.h" 40 #include "back-meta.h" 41 42 /* 43 * meta_back_conndn_cmp 44 * 45 * compares two struct metaconn based on the value of the conn pointer 46 * and of the local DN; used by avl stuff 47 */ 48 int 49 meta_back_conndn_cmp( 50 const void *c1, 51 const void *c2 ) 52 { 53 metaconn_t *mc1 = ( metaconn_t * )c1; 54 metaconn_t *mc2 = ( metaconn_t * )c2; 55 int rc; 56 57 /* If local DNs don't match, it is definitely not a match */ 58 /* For shared sessions, conn is NULL. Only explicitly 59 * bound sessions will have non-NULL conn. 60 */ 61 rc = SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn ); 62 if ( rc == 0 ) { 63 rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn ); 64 } 65 66 return rc; 67 } 68 69 /* 70 * meta_back_conndnmc_cmp 71 * 72 * compares two struct metaconn based on the value of the conn pointer, 73 * the local DN and the struct pointer; used by avl stuff 74 */ 75 static int 76 meta_back_conndnmc_cmp( 77 const void *c1, 78 const void *c2 ) 79 { 80 metaconn_t *mc1 = ( metaconn_t * )c1; 81 metaconn_t *mc2 = ( metaconn_t * )c2; 82 int rc; 83 84 /* If local DNs don't match, it is definitely not a match */ 85 /* For shared sessions, conn is NULL. Only explicitly 86 * bound sessions will have non-NULL conn. 87 */ 88 rc = SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn ); 89 if ( rc == 0 ) { 90 rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn ); 91 if ( rc == 0 ) { 92 rc = SLAP_PTRCMP( mc1, mc2 ); 93 } 94 } 95 96 return rc; 97 } 98 99 /* 100 * meta_back_conn_cmp 101 * 102 * compares two struct metaconn based on the value of the conn pointer; 103 * used by avl stuff 104 */ 105 int 106 meta_back_conn_cmp( 107 const void *c1, 108 const void *c2 ) 109 { 110 metaconn_t *mc1 = ( metaconn_t * )c1; 111 metaconn_t *mc2 = ( metaconn_t * )c2; 112 113 /* For shared sessions, conn is NULL. Only explicitly 114 * bound sessions will have non-NULL conn. 115 */ 116 return SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn ); 117 } 118 119 /* 120 * meta_back_conndn_dup 121 * 122 * returns -1 in case a duplicate struct metaconn has been inserted; 123 * used by avl stuff 124 */ 125 int 126 meta_back_conndn_dup( 127 void *c1, 128 void *c2 ) 129 { 130 metaconn_t *mc1 = ( metaconn_t * )c1; 131 metaconn_t *mc2 = ( metaconn_t * )c2; 132 133 /* Cannot have more than one shared session with same DN */ 134 if ( mc1->mc_conn == mc2->mc_conn && 135 dn_match( &mc1->mc_local_ndn, &mc2->mc_local_ndn ) ) 136 { 137 return -1; 138 } 139 140 return 0; 141 } 142 143 /* 144 * Debug stuff (got it from libavl) 145 */ 146 #if META_BACK_PRINT_CONNTREE > 0 147 static void 148 meta_back_print( metaconn_t *mc, char *avlstr ) 149 { 150 int i; 151 152 fputs( "targets=[", stderr ); 153 for ( i = 0; i < mc->mc_info->mi_ntargets; i++ ) { 154 fputc( mc->mc_conns[ i ].msc_ld ? '*' : 'o', stderr); 155 } 156 fputc( ']', stderr ); 157 158 fprintf( stderr, " mc=%p local=\"%s\" conn=%p refcnt=%d%s %s\n", 159 (void *)mc, 160 mc->mc_local_ndn.bv_val ? mc->mc_local_ndn.bv_val : "", 161 (void *)mc->mc_conn, 162 mc->mc_refcnt, 163 LDAP_BACK_CONN_TAINTED( mc ) ? " tainted" : "", 164 avlstr ); 165 } 166 167 static void 168 meta_back_ravl_print( TAvlnode *root, int depth ) 169 { 170 int i; 171 172 if ( root == 0 ) { 173 return; 174 } 175 176 meta_back_ravl_print( root->avl_right, depth + 1 ); 177 178 for ( i = 0; i < depth; i++ ) { 179 fprintf( stderr, "-" ); 180 } 181 fputc( ' ', stderr ); 182 183 meta_back_print( (metaconn_t *)root->avl_data, 184 avl_bf2str( root->avl_bf ) ); 185 186 meta_back_ravl_print( root->avl_left, depth + 1 ); 187 } 188 189 /* NOTE: duplicate from back-ldap/bind.c */ 190 static char* priv2str[] = { 191 "privileged", 192 "privileged/TLS", 193 "anonymous", 194 "anonymous/TLS", 195 "bind", 196 "bind/TLS", 197 NULL 198 }; 199 200 void 201 meta_back_print_conntree( metainfo_t *mi, char *msg ) 202 { 203 int c; 204 205 fprintf( stderr, "========> %s\n", msg ); 206 207 for ( c = LDAP_BACK_PCONN_FIRST; c < LDAP_BACK_PCONN_LAST; c++ ) { 208 int i = 0; 209 metaconn_t *mc; 210 211 fprintf( stderr, " %s[%d]\n", priv2str[ c ], mi->mi_conn_priv[ c ].mic_num ); 212 213 LDAP_TAILQ_FOREACH( mc, &mi->mi_conn_priv[ c ].mic_priv, mc_q ) 214 { 215 fprintf( stderr, " [%d] ", i ); 216 meta_back_print( mc, "" ); 217 i++; 218 } 219 } 220 221 if ( mi->mi_conninfo.lai_tree == NULL ) { 222 fprintf( stderr, "\t(empty)\n" ); 223 224 } else { 225 meta_back_ravl_print( mi->mi_conninfo.lai_tree, 0 ); 226 } 227 228 fprintf( stderr, "<======== %s\n", msg ); 229 } 230 #endif /* META_BACK_PRINT_CONNTREE */ 231 /* 232 * End of debug stuff 233 */ 234 235 /* 236 * metaconn_alloc 237 * 238 * Allocates a connection structure, making room for all the referenced targets 239 */ 240 static metaconn_t * 241 metaconn_alloc( 242 Operation *op ) 243 { 244 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private; 245 metaconn_t *mc; 246 int ntargets = mi->mi_ntargets; 247 248 assert( ntargets > 0 ); 249 250 /* malloc all in one */ 251 mc = ( metaconn_t * )ch_calloc( 1, sizeof( metaconn_t ) 252 + sizeof( metasingleconn_t ) * ( ntargets - 1 ) ); 253 if ( mc == NULL ) { 254 return NULL; 255 } 256 257 mc->mc_info = mi; 258 259 mc->mc_authz_target = META_BOUND_NONE; 260 mc->mc_refcnt = 1; 261 262 return mc; 263 } 264 265 /* 266 * meta_back_init_one_conn 267 * 268 * Initializes one connection 269 */ 270 int 271 meta_back_init_one_conn( 272 Operation *op, 273 SlapReply *rs, 274 metaconn_t *mc, 275 int candidate, 276 int ispriv, 277 ldap_back_send_t sendok, 278 int dolock ) 279 { 280 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private; 281 metatarget_t *mt = mi->mi_targets[ candidate ]; 282 metasingleconn_t *msc = &mc->mc_conns[ candidate ]; 283 int version; 284 dncookie dc; 285 int isauthz = ( candidate == mc->mc_authz_target ); 286 int do_return = 0; 287 #ifdef HAVE_TLS 288 int is_ldaps = 0; 289 int do_start_tls = 0; 290 #endif /* HAVE_TLS */ 291 292 /* if the server is quarantined, and 293 * - the current interval did not expire yet, or 294 * - no more retries should occur, 295 * don't return the connection */ 296 if ( mt->mt_isquarantined ) { 297 slap_retry_info_t *ri = &mt->mt_quarantine; 298 int dont_retry = 0; 299 300 if ( mt->mt_quarantine.ri_interval ) { 301 ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex ); 302 dont_retry = ( mt->mt_isquarantined > LDAP_BACK_FQ_NO ); 303 if ( dont_retry ) { 304 dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL 305 || slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] ); 306 if ( !dont_retry ) { 307 Debug(LDAP_DEBUG_ANY, 308 "%s meta_back_init_one_conn[%d]: quarantine " "retry block #%d try #%d.\n", 309 op->o_log_prefix, 310 candidate, ri->ri_idx, 311 ri->ri_count ); 312 313 mt->mt_isquarantined = LDAP_BACK_FQ_RETRYING; 314 } 315 316 } 317 ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex ); 318 } 319 320 if ( dont_retry ) { 321 rs->sr_err = LDAP_UNAVAILABLE; 322 if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) { 323 rs->sr_text = "Target is quarantined"; 324 send_ldap_result( op, rs ); 325 } 326 return rs->sr_err; 327 } 328 } 329 330 retry_lock:; 331 if ( dolock ) { 332 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex ); 333 } 334 335 /* 336 * Already init'ed 337 */ 338 if ( LDAP_BACK_CONN_ISBOUND( msc ) 339 || LDAP_BACK_CONN_ISANON( msc ) ) 340 { 341 assert( msc->msc_ld != NULL ); 342 rs->sr_err = LDAP_SUCCESS; 343 do_return = 1; 344 345 } else if ( META_BACK_CONN_CREATING( msc ) 346 || LDAP_BACK_CONN_BINDING( msc ) ) 347 { 348 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) { 349 if ( dolock ) { 350 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); 351 } 352 353 ldap_pvt_thread_yield(); 354 goto retry_lock; 355 } 356 357 /* sounds more appropriate */ 358 rs->sr_err = LDAP_BUSY; 359 rs->sr_text = "No connections to target are available"; 360 do_return = 1; 361 362 } else if ( META_BACK_CONN_INITED( msc ) ) { 363 assert( msc->msc_ld != NULL ); 364 rs->sr_err = LDAP_SUCCESS; 365 do_return = 1; 366 367 } else { 368 /* 369 * creating... 370 */ 371 META_BACK_CONN_CREATING_SET( msc ); 372 } 373 374 if ( dolock ) { 375 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); 376 } 377 378 if ( do_return ) { 379 if ( rs->sr_err != LDAP_SUCCESS 380 && op->o_conn 381 && ( sendok & LDAP_BACK_SENDERR ) ) 382 { 383 send_ldap_result( op, rs ); 384 } 385 386 return rs->sr_err; 387 } 388 389 assert( msc->msc_ld == NULL ); 390 391 /* 392 * Attempts to initialize the connection to the target ds 393 */ 394 ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex ); 395 rs->sr_err = ldap_initialize( &msc->msc_ld, mt->mt_uri ); 396 #ifdef HAVE_TLS 397 is_ldaps = ldap_is_ldaps_url( mt->mt_uri ); 398 #endif /* HAVE_TLS */ 399 ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex ); 400 if ( rs->sr_err != LDAP_SUCCESS ) { 401 goto error_return; 402 } 403 404 /* 405 * Set LDAP version. This will always succeed: If the client 406 * bound with a particular version, then so can we. 407 */ 408 if ( mt->mt_version != 0 ) { 409 version = mt->mt_version; 410 411 } else if ( op->o_conn->c_protocol != 0 ) { 412 version = op->o_conn->c_protocol; 413 414 } else { 415 version = LDAP_VERSION3; 416 } 417 ldap_set_option( msc->msc_ld, LDAP_OPT_PROTOCOL_VERSION, &version ); 418 ldap_set_urllist_proc( msc->msc_ld, mt->mt_urllist_f, mt->mt_urllist_p ); 419 420 /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */ 421 ldap_set_option( msc->msc_ld, LDAP_OPT_REFERRALS, 422 META_BACK_TGT_CHASE_REFERRALS( mt ) ? LDAP_OPT_ON : LDAP_OPT_OFF ); 423 424 slap_client_keepalive(msc->msc_ld, &mt->mt_tls.sb_keepalive); 425 426 if ( mt->mt_tls.sb_tcp_user_timeout > 0 ) { 427 ldap_set_option( msc->msc_ld, LDAP_OPT_TCP_USER_TIMEOUT, 428 &mt->mt_tls.sb_tcp_user_timeout ); 429 } 430 431 432 433 #ifdef HAVE_TLS 434 { 435 slap_bindconf *sb = NULL; 436 437 if ( ispriv ) { 438 sb = &mt->mt_idassert.si_bc; 439 } else { 440 sb = &mt->mt_tls; 441 } 442 443 bindconf_tls_set( sb, msc->msc_ld ); 444 445 if ( !is_ldaps ) { 446 if ( META_BACK_TGT_USE_TLS( mt ) 447 || ( op->o_conn->c_is_tls && META_BACK_TGT_PROPAGATE_TLS( mt ) ) ) 448 { 449 do_start_tls = 1; 450 } 451 } 452 } 453 454 /* start TLS ("tls [try-]{start|propagate}" statement) */ 455 if ( do_start_tls ) { 456 #ifdef SLAP_STARTTLS_ASYNCHRONOUS 457 /* 458 * use asynchronous StartTLS; in case, chase referral 459 * FIXME: OpenLDAP does not return referral on StartTLS yet 460 */ 461 int msgid; 462 463 rs->sr_err = ldap_start_tls( msc->msc_ld, NULL, NULL, &msgid ); 464 if ( rs->sr_err == LDAP_SUCCESS ) { 465 LDAPMessage *res = NULL; 466 int rc, nretries = mt->mt_nretries; 467 struct timeval tv; 468 469 LDAP_BACK_TV_SET( &tv ); 470 471 retry:; 472 rc = ldap_result( msc->msc_ld, msgid, LDAP_MSG_ALL, &tv, &res ); 473 switch ( rc ) { 474 case -1: 475 rs->sr_err = LDAP_UNAVAILABLE; 476 rs->sr_text = "Remote server down"; 477 break; 478 479 case 0: 480 if ( nretries != 0 ) { 481 if ( nretries > 0 ) { 482 nretries--; 483 } 484 LDAP_BACK_TV_SET( &tv ); 485 goto retry; 486 } 487 rs->sr_err = LDAP_OTHER; 488 rs->sr_text = "Timeout, no more retries"; 489 break; 490 491 default: 492 /* only touch when activity actually took place... */ 493 if ( mi->mi_idle_timeout != 0 && msc->msc_time < op->o_time ) { 494 msc->msc_time = op->o_time; 495 } 496 break; 497 } 498 499 if ( rc == LDAP_RES_EXTENDED ) { 500 struct berval *data = NULL; 501 502 /* NOTE: right now, data is unused, so don't get it */ 503 rs->sr_err = ldap_parse_extended_result( msc->msc_ld, 504 res, NULL, NULL /* &data */ , 0 ); 505 if ( rs->sr_err == LDAP_SUCCESS ) { 506 int err; 507 508 /* FIXME: matched? referrals? response controls? */ 509 rs->sr_err = ldap_parse_result( msc->msc_ld, 510 res, &err, NULL, NULL, NULL, NULL, 1 ); 511 res = NULL; 512 513 if ( rs->sr_err == LDAP_SUCCESS ) { 514 rs->sr_err = err; 515 } 516 rs->sr_err = slap_map_api2result( rs ); 517 518 /* FIXME: in case a referral 519 * is returned, should we try 520 * using it instead of the 521 * configured URI? */ 522 if ( rs->sr_err == LDAP_SUCCESS ) { 523 rs->sr_err = ldap_install_tls( msc->msc_ld ); 524 525 } else if ( rs->sr_err == LDAP_REFERRAL ) { 526 /* FIXME: LDAP_OPERATIONS_ERROR? */ 527 rs->sr_err = LDAP_OTHER; 528 rs->sr_text = "Unwilling to chase referral " 529 "returned by Start TLS exop"; 530 } 531 532 if ( data ) { 533 ber_bvfree( data ); 534 } 535 } 536 537 } else { 538 rs->sr_err = LDAP_OTHER; 539 rs->sr_text = "Unknown response to StartTLS request :" 540 " an ExtendedResponse is expected"; 541 } 542 543 if ( res != NULL ) { 544 ldap_msgfree( res ); 545 } 546 } 547 #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */ 548 /* 549 * use synchronous StartTLS 550 */ 551 rs->sr_err = ldap_start_tls_s( msc->msc_ld, NULL, NULL ); 552 #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */ 553 554 /* if StartTLS is requested, only attempt it if the URL 555 * is not "ldaps://"; this may occur not only in case 556 * of misconfiguration, but also when used in the chain 557 * overlay, where the "uri" can be parsed out of a referral */ 558 if ( rs->sr_err == LDAP_SERVER_DOWN 559 || ( rs->sr_err != LDAP_SUCCESS 560 && META_BACK_TGT_TLS_CRITICAL( mt ) ) ) 561 { 562 563 #ifdef DEBUG_205 564 Debug( LDAP_DEBUG_ANY, 565 "### %s meta_back_init_one_conn(TLS) " 566 "ldap_unbind_ext[%d] ld=%p\n", 567 op->o_log_prefix, candidate, 568 (void *)msc->msc_ld ); 569 #endif /* DEBUG_205 */ 570 571 /* need to trash a failed Start TLS */ 572 meta_clear_one_candidate( op, mc, candidate ); 573 goto error_return; 574 } 575 } 576 #endif /* HAVE_TLS */ 577 578 /* 579 * Set the network timeout if set 580 */ 581 if ( mt->mt_network_timeout != 0 ) { 582 struct timeval network_timeout; 583 584 network_timeout.tv_usec = 0; 585 network_timeout.tv_sec = mt->mt_network_timeout; 586 587 ldap_set_option( msc->msc_ld, LDAP_OPT_NETWORK_TIMEOUT, 588 (void *)&network_timeout ); 589 } 590 591 /* 592 * If the connection DN is not null, an attempt to rewrite it is made 593 */ 594 595 if ( ispriv ) { 596 if ( !BER_BVISNULL( &mt->mt_idassert_authcDN ) ) { 597 ber_bvreplace( &msc->msc_bound_ndn, &mt->mt_idassert_authcDN ); 598 if ( !BER_BVISNULL( &mt->mt_idassert_passwd ) ) { 599 if ( !BER_BVISNULL( &msc->msc_cred ) ) { 600 memset( msc->msc_cred.bv_val, 0, 601 msc->msc_cred.bv_len ); 602 } 603 ber_bvreplace( &msc->msc_cred, &mt->mt_idassert_passwd ); 604 } 605 LDAP_BACK_CONN_ISIDASSERT_SET( msc ); 606 607 } else { 608 ber_bvreplace( &msc->msc_bound_ndn, &slap_empty_bv ); 609 } 610 611 } else { 612 if ( !BER_BVISNULL( &msc->msc_cred ) ) { 613 memset( msc->msc_cred.bv_val, 0, msc->msc_cred.bv_len ); 614 ber_memfree_x( msc->msc_cred.bv_val, NULL ); 615 BER_BVZERO( &msc->msc_cred ); 616 } 617 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) ) { 618 ber_memfree_x( msc->msc_bound_ndn.bv_val, NULL ); 619 BER_BVZERO( &msc->msc_bound_ndn ); 620 } 621 if ( !BER_BVISEMPTY( &op->o_ndn ) 622 && SLAP_IS_AUTHZ_BACKEND( op ) 623 && isauthz ) 624 { 625 dc.target = mt; 626 dc.conn = op->o_conn; 627 dc.rs = rs; 628 dc.ctx = "bindDN"; 629 630 /* 631 * Rewrite the bind dn if needed 632 */ 633 if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn, 634 &msc->msc_bound_ndn ) ) 635 { 636 637 #ifdef DEBUG_205 638 Debug( LDAP_DEBUG_ANY, 639 "### %s meta_back_init_one_conn(rewrite) " 640 "ldap_unbind_ext[%d] ld=%p\n", 641 op->o_log_prefix, candidate, 642 (void *)msc->msc_ld ); 643 #endif /* DEBUG_205 */ 644 645 /* need to trash a connection not fully established */ 646 meta_clear_one_candidate( op, mc, candidate ); 647 goto error_return; 648 } 649 650 /* copy the DN if needed */ 651 if ( msc->msc_bound_ndn.bv_val == op->o_conn->c_dn.bv_val ) { 652 ber_dupbv( &msc->msc_bound_ndn, &op->o_conn->c_dn ); 653 } 654 655 assert( !BER_BVISNULL( &msc->msc_bound_ndn ) ); 656 657 } else { 658 ber_dupbv( &msc->msc_bound_ndn, (struct berval *)&slap_empty_bv ); 659 } 660 } 661 662 assert( !BER_BVISNULL( &msc->msc_bound_ndn ) ); 663 664 error_return:; 665 if ( dolock ) { 666 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex ); 667 } 668 META_BACK_CONN_CREATING_CLEAR( msc ); 669 if ( rs->sr_err == LDAP_SUCCESS ) { 670 /* 671 * Sets a cookie for the rewrite session 672 */ 673 ( void )rewrite_session_init( mt->mt_rwmap.rwm_rw, op->o_conn ); 674 META_BACK_CONN_INITED_SET( msc ); 675 } 676 if ( dolock ) { 677 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); 678 } 679 680 if ( rs->sr_err != LDAP_SUCCESS ) { 681 /* Get the error message and print it in TRACE mode */ 682 if ( LogTest( LDAP_DEBUG_TRACE ) ) { 683 Log( LDAP_DEBUG_TRACE, ldap_syslog_level, "%s: meta_back_init_one_conn[%d] failed err=%d text=%s\n", 684 op->o_log_prefix, candidate, rs->sr_err, rs->sr_text ); 685 } 686 687 rs->sr_err = slap_map_api2result( rs ); 688 if ( sendok & LDAP_BACK_SENDERR ) { 689 send_ldap_result( op, rs ); 690 } 691 } 692 693 return rs->sr_err; 694 } 695 696 /* 697 * meta_back_retry 698 * 699 * Retries one connection 700 */ 701 int 702 meta_back_retry( 703 Operation *op, 704 SlapReply *rs, 705 metaconn_t **mcp, 706 int candidate, 707 ldap_back_send_t sendok, 708 SlapReply *candidates ) 709 { 710 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private; 711 metatarget_t *mt = mi->mi_targets[ candidate ]; 712 metaconn_t *mc = *mcp; 713 metasingleconn_t *msc = &mc->mc_conns[ candidate ]; 714 int rc = LDAP_UNAVAILABLE, 715 binding, 716 quarantine = 1; 717 718 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex ); 719 720 assert( !META_BACK_CONN_CREATING( msc ) ); 721 binding = LDAP_BACK_CONN_BINDING( msc ); 722 LDAP_BACK_CONN_BINDING_CLEAR( msc ); 723 724 assert( mc->mc_refcnt > 0 ); 725 if ( mc->mc_refcnt == 1 ) { 726 struct berval save_cred; 727 728 if ( LogTest( LDAP_DEBUG_ANY ) ) { 729 /* this lock is required; however, 730 * it's invoked only when logging is on */ 731 ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex ); 732 Debug(LDAP_DEBUG_ANY, 733 "%s meta_back_retry[%d]: retrying URI=\"%s\" DN=\"%s\".\n", 734 op->o_log_prefix, candidate, mt->mt_uri, 735 BER_BVISNULL(&msc->msc_bound_ndn) ? "" : msc->msc_bound_ndn.bv_val ); 736 ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex ); 737 } 738 739 /* save credentials, if any, for later use; 740 * meta_clear_one_candidate() would free them */ 741 save_cred = msc->msc_cred; 742 BER_BVZERO( &msc->msc_cred ); 743 744 meta_clear_one_candidate( op, mc, candidate ); 745 LDAP_BACK_CONN_ISBOUND_CLEAR( msc ); 746 747 ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn ); 748 749 /* mc here must be the regular mc, reset and ready for init */ 750 rc = meta_back_init_one_conn( op, rs, mc, candidate, 751 LDAP_BACK_CONN_ISPRIV( mc ), sendok, 0 ); 752 753 /* restore credentials, if any and if needed; 754 * meta_back_init_one_conn() restores msc_bound_ndn, if any; 755 * if no msc_bound_ndn is restored, destroy credentials */ 756 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) 757 && BER_BVISNULL( &msc->msc_cred ) ) 758 { 759 msc->msc_cred = save_cred; 760 761 } else if ( !BER_BVISNULL( &save_cred ) ) { 762 memset( save_cred.bv_val, 0, save_cred.bv_len ); 763 ber_memfree_x( save_cred.bv_val, NULL ); 764 } 765 766 /* restore the "binding" flag, in case */ 767 if ( binding ) { 768 LDAP_BACK_CONN_BINDING_SET( msc ); 769 } 770 771 if ( rc == LDAP_SUCCESS ) { 772 quarantine = 0; 773 LDAP_BACK_CONN_BINDING_SET( msc ); binding = 1; 774 rc = meta_back_single_dobind( op, rs, mcp, candidate, 775 sendok, mt->mt_nretries, 0 ); 776 777 Debug( LDAP_DEBUG_ANY, 778 "%s meta_back_retry[%d]: " 779 "meta_back_single_dobind=%d\n", 780 op->o_log_prefix, candidate, rc ); 781 if ( rc == LDAP_SUCCESS ) { 782 if ( !BER_BVISNULL( &msc->msc_bound_ndn ) && 783 !BER_BVISEMPTY( &msc->msc_bound_ndn ) ) 784 { 785 LDAP_BACK_CONN_ISBOUND_SET( msc ); 786 787 } else { 788 LDAP_BACK_CONN_ISANON_SET( msc ); 789 } 790 791 /* when bound, dispose of the "binding" flag */ 792 if ( binding ) { 793 LDAP_BACK_CONN_BINDING_CLEAR( msc ); 794 } 795 } 796 } 797 798 #if 0 /* ITS#7591, following stmt drops needed result msgs */ 799 /* don't send twice */ 800 sendok &= ~LDAP_BACK_SENDERR; 801 #endif 802 } 803 804 if ( rc != LDAP_SUCCESS ) { 805 SlapReply *candidates = meta_back_candidates_get( op ); 806 807 candidates[ candidate ].sr_err = rc; 808 809 if ( *mcp != NULL ) { 810 if ( mc->mc_refcnt == 1 ) { 811 if ( binding ) { 812 LDAP_BACK_CONN_BINDING_CLEAR( msc ); 813 } 814 (void)meta_clear_one_candidate( op, mc, candidate ); 815 } 816 817 LDAP_BACK_CONN_TAINTED_SET( mc ); 818 /* only release if mandatory; otherwise 819 * let the caller do what's best before 820 * releasing */ 821 if ( META_BACK_ONERR_STOP( mi ) ) { 822 meta_back_release_conn_lock( mi, mc, 0 ); 823 *mcp = NULL; 824 825 } else { 826 #if META_BACK_PRINT_CONNTREE > 0 827 meta_back_print_conntree( mi, ">>> meta_back_retry" ); 828 #endif /* META_BACK_PRINT_CONNTREE */ 829 830 /* FIXME: could be done better, reworking meta_back_release_conn_lock() */ 831 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) { 832 if ( mc->mc_q.tqe_prev != NULL ) { 833 assert( LDAP_BACK_CONN_CACHED( mc ) ); 834 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 ); 835 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, 836 mc, mc_q ); 837 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--; 838 LDAP_TAILQ_ENTRY_INIT( mc, mc_q ); 839 840 } else { 841 assert( !LDAP_BACK_CONN_CACHED( mc ) ); 842 } 843 844 } else { 845 /* FIXME: check if in tree, for consistency? */ 846 (void)ldap_tavl_delete( &mi->mi_conninfo.lai_tree, 847 ( caddr_t )mc, meta_back_conndnmc_cmp ); 848 } 849 LDAP_BACK_CONN_CACHED_CLEAR( mc ); 850 851 #if META_BACK_PRINT_CONNTREE > 0 852 meta_back_print_conntree( mi, "<<< meta_back_retry" ); 853 #endif /* META_BACK_PRINT_CONNTREE */ 854 } 855 } 856 857 if ( sendok & LDAP_BACK_SENDERR ) { 858 rs->sr_err = rc; 859 rs->sr_text = "Unable to retry"; 860 send_ldap_result( op, rs ); 861 } 862 } 863 864 if ( quarantine && META_BACK_TGT_QUARANTINE( mt ) ) { 865 meta_back_quarantine( op, rs, candidate ); 866 } 867 868 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); 869 870 return rc == LDAP_SUCCESS ? 1 : 0; 871 } 872 873 /* 874 * callback for unique candidate selection 875 */ 876 static int 877 meta_back_conn_cb( Operation *op, SlapReply *rs ) 878 { 879 assert( op->o_tag == LDAP_REQ_SEARCH ); 880 881 switch ( rs->sr_type ) { 882 case REP_SEARCH: 883 ((long *)op->o_callback->sc_private)[0] = (long)op->o_private; 884 break; 885 886 case REP_SEARCHREF: 887 case REP_RESULT: 888 break; 889 890 default: 891 return rs->sr_err; 892 } 893 894 return 0; 895 } 896 897 898 static int 899 meta_back_get_candidate( 900 Operation *op, 901 SlapReply *rs, 902 struct berval *ndn ) 903 { 904 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private; 905 long candidate; 906 907 /* 908 * tries to get a unique candidate 909 * (takes care of default target) 910 */ 911 candidate = meta_back_select_unique_candidate( mi, ndn ); 912 913 /* 914 * if any is found, inits the connection 915 */ 916 if ( candidate == META_TARGET_NONE ) { 917 rs->sr_err = LDAP_NO_SUCH_OBJECT; 918 rs->sr_text = "No suitable candidate target found"; 919 920 } else if ( candidate == META_TARGET_MULTIPLE ) { 921 Operation op2 = *op; 922 SlapReply rs2 = { REP_RESULT }; 923 slap_callback cb2 = { 0 }; 924 int rc; 925 926 /* try to get a unique match for the request ndn 927 * among the multiple candidates available */ 928 op2.o_tag = LDAP_REQ_SEARCH; 929 op2.o_req_dn = *ndn; 930 op2.o_req_ndn = *ndn; 931 op2.ors_scope = LDAP_SCOPE_BASE; 932 op2.ors_deref = LDAP_DEREF_NEVER; 933 op2.ors_attrs = slap_anlist_no_attrs; 934 op2.ors_attrsonly = 0; 935 op2.ors_limit = NULL; 936 op2.ors_slimit = 1; 937 op2.ors_tlimit = SLAP_NO_LIMIT; 938 939 op2.ors_filter = (Filter *)slap_filter_objectClass_pres; 940 op2.ors_filterstr = *slap_filterstr_objectClass_pres; 941 942 op2.o_callback = &cb2; 943 cb2.sc_response = meta_back_conn_cb; 944 cb2.sc_private = (void *)&candidate; 945 946 rc = op->o_bd->be_search( &op2, &rs2 ); 947 948 switch ( rs2.sr_err ) { 949 case LDAP_SUCCESS: 950 default: 951 rs->sr_err = rs2.sr_err; 952 break; 953 954 case LDAP_SIZELIMIT_EXCEEDED: 955 /* if multiple candidates can serve the operation, 956 * and a default target is defined, and it is 957 * a candidate, try using it (FIXME: YMMV) */ 958 if ( mi->mi_defaulttarget != META_DEFAULT_TARGET_NONE 959 && meta_back_is_candidate( mi->mi_targets[ mi->mi_defaulttarget ], 960 ndn, op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_BASE ) ) 961 { 962 candidate = mi->mi_defaulttarget; 963 rs->sr_err = LDAP_SUCCESS; 964 rs->sr_text = NULL; 965 966 } else { 967 rs->sr_err = LDAP_UNWILLING_TO_PERFORM; 968 rs->sr_text = "Unable to select unique candidate target"; 969 } 970 break; 971 } 972 973 } else { 974 rs->sr_err = LDAP_SUCCESS; 975 } 976 977 return candidate; 978 } 979 980 SlapReply * 981 meta_back_candidates_get( Operation *op ) 982 { 983 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private; 984 SlapReply *candidates; 985 986 candidates = op->o_tmpcalloc( mi->mi_ntargets, sizeof( SlapReply ), op->o_tmpmemctx ); 987 return candidates; 988 } 989 990 /* 991 * meta_back_getconn 992 * 993 * Prepares the connection structure 994 * 995 * RATIONALE: 996 * 997 * - determine what DN is being requested: 998 * 999 * op requires candidate checks 1000 * 1001 * add unique parent of o_req_ndn 1002 * bind unique^*[/all] o_req_ndn [no check] 1003 * compare unique^+ o_req_ndn 1004 * delete unique o_req_ndn 1005 * modify unique o_req_ndn 1006 * search any o_req_ndn 1007 * modrdn unique[, unique] o_req_ndn[, orr_nnewSup] 1008 * 1009 * - for ops that require the candidate to be unique, in case of multiple 1010 * occurrences an internal search with sizeLimit=1 is performed 1011 * if a unique candidate can actually be determined. If none is found, 1012 * the operation aborts; if multiple are found, the default target 1013 * is used if defined and candidate; otherwise the operation aborts. 1014 * 1015 * *^note: actually, the bind operation is handled much like a search; 1016 * i.e. the bind is broadcast to all candidate targets. 1017 * 1018 * +^note: actually, the compare operation is handled much like a search; 1019 * i.e. the compare is broadcast to all candidate targets, while checking 1020 * that exactly none (noSuchObject) or one (TRUE/FALSE/UNDEFINED) is 1021 * returned. 1022 */ 1023 metaconn_t * 1024 meta_back_getconn( 1025 Operation *op, 1026 SlapReply *rs, 1027 int *candidate, 1028 ldap_back_send_t sendok, 1029 SlapReply *candidates ) 1030 { 1031 metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private; 1032 metaconn_t *mc = NULL, 1033 mc_curr = {{ 0 }}; 1034 int cached = META_TARGET_NONE, 1035 i = META_TARGET_NONE, 1036 err = LDAP_SUCCESS, 1037 new_conn = 0, 1038 ncandidates = 0; 1039 1040 1041 meta_op_type op_type = META_OP_REQUIRE_SINGLE; 1042 enum { 1043 META_DNTYPE_ENTRY, 1044 META_DNTYPE_PARENT, 1045 META_DNTYPE_NEWPARENT 1046 } dn_type = META_DNTYPE_ENTRY; 1047 struct berval ndn = op->o_req_ndn, 1048 pndn; 1049 1050 /* Internal searches are privileged and shared. So is root. */ 1051 if ( ( !BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ALWAYS( mi ) ) 1052 || ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ANON( mi ) ) 1053 || op->o_do_not_cache || be_isroot( op ) ) 1054 { 1055 LDAP_BACK_CONN_ISPRIV_SET( &mc_curr ); 1056 mc_curr.mc_local_ndn = op->o_bd->be_rootndn; 1057 LDAP_BACK_PCONN_ROOTDN_SET( &mc_curr, op ); 1058 1059 } else if ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_NOANON( mi ) ) 1060 { 1061 LDAP_BACK_CONN_ISANON_SET( &mc_curr ); 1062 BER_BVSTR( &mc_curr.mc_local_ndn, "" ); 1063 LDAP_BACK_PCONN_ANON_SET( &mc_curr, op ); 1064 1065 } else { 1066 mc_curr.mc_local_ndn = op->o_ndn; 1067 1068 /* Explicit binds must not be shared */ 1069 if ( !BER_BVISEMPTY( &op->o_ndn ) 1070 || op->o_tag == LDAP_REQ_BIND 1071 || SLAP_IS_AUTHZ_BACKEND( op ) ) 1072 { 1073 mc_curr.mc_conn = op->o_conn; 1074 1075 } else { 1076 LDAP_BACK_CONN_ISANON_SET( &mc_curr ); 1077 LDAP_BACK_PCONN_ANON_SET( &mc_curr, op ); 1078 } 1079 } 1080 1081 /* Explicit Bind requests always get their own conn */ 1082 if ( sendok & LDAP_BACK_BINDING ) { 1083 mc_curr.mc_conn = op->o_conn; 1084 1085 } else { 1086 /* Searches for a metaconn in the avl tree */ 1087 retry_lock:; 1088 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex ); 1089 if ( LDAP_BACK_PCONN_ISPRIV( &mc_curr ) ) { 1090 /* lookup a conn that's not binding */ 1091 LDAP_TAILQ_FOREACH( mc, 1092 &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv, 1093 mc_q ) 1094 { 1095 if ( !LDAP_BACK_CONN_BINDING( mc ) && mc->mc_refcnt == 0 ) { 1096 break; 1097 } 1098 } 1099 1100 if ( mc != NULL ) { 1101 /* move to tail of queue */ 1102 if ( mc != LDAP_TAILQ_LAST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, 1103 mc_conn_priv_q ) ) 1104 { 1105 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, 1106 mc, mc_q ); 1107 LDAP_TAILQ_ENTRY_INIT( mc, mc_q ); 1108 LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, 1109 mc, mc_q ); 1110 } 1111 1112 } else if ( !LDAP_BACK_USE_TEMPORARIES( mi ) 1113 && mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_num == mi->mi_conn_priv_max ) 1114 { 1115 mc = LDAP_TAILQ_FIRST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv ); 1116 } 1117 1118 1119 } else { 1120 mc = (metaconn_t *)ldap_tavl_find( mi->mi_conninfo.lai_tree, 1121 (caddr_t)&mc_curr, meta_back_conndn_cmp ); 1122 } 1123 1124 if ( mc ) { 1125 /* catch taint errors */ 1126 assert( !LDAP_BACK_CONN_TAINTED( mc ) ); 1127 1128 /* Don't reuse connections while they're still binding 1129 * NOTE: only makes sense for binds */ 1130 if ( LDAP_BACK_CONN_BINDING( mc ) ) { 1131 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) { 1132 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); 1133 1134 ldap_pvt_thread_yield(); 1135 goto retry_lock; 1136 } 1137 1138 /* release conn, and create a temporary */ 1139 mc = NULL; 1140 1141 } else { 1142 if ( mc->mc_refcnt == 0 && (( mi->mi_conn_ttl != 0 && op->o_time > mc->mc_create_time + mi->mi_conn_ttl ) 1143 || ( mi->mi_idle_timeout != 0 && op->o_time > mc->mc_time + mi->mi_idle_timeout )) ) 1144 { 1145 #if META_BACK_PRINT_CONNTREE > 0 1146 meta_back_print_conntree( mi, 1147 ">>> meta_back_getconn(expired)" ); 1148 #endif /* META_BACK_PRINT_CONNTREE */ 1149 1150 /* don't let anyone else use this expired connection */ 1151 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) { 1152 if ( mc->mc_q.tqe_prev != NULL ) { 1153 assert( LDAP_BACK_CONN_CACHED( mc ) ); 1154 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 ); 1155 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, 1156 mc, mc_q ); 1157 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--; 1158 LDAP_TAILQ_ENTRY_INIT( mc, mc_q ); 1159 1160 } else { 1161 assert( !LDAP_BACK_CONN_CACHED( mc ) ); 1162 } 1163 1164 } else { 1165 (void)ldap_tavl_delete( &mi->mi_conninfo.lai_tree, 1166 (caddr_t)mc, meta_back_conndnmc_cmp ); 1167 } 1168 1169 #if META_BACK_PRINT_CONNTREE > 0 1170 meta_back_print_conntree( mi, 1171 "<<< meta_back_getconn(expired)" ); 1172 #endif /* META_BACK_PRINT_CONNTREE */ 1173 LDAP_BACK_CONN_TAINTED_SET( mc ); 1174 LDAP_BACK_CONN_CACHED_CLEAR( mc ); 1175 1176 if ( LogTest( LDAP_DEBUG_TRACE ) ) { 1177 char buf[STRLENOF("4294967295U") + 1] = { 0 }; 1178 mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) ); 1179 1180 Debug( LDAP_DEBUG_TRACE, 1181 "%s meta_back_getconn: mc=%p conn=%s expired (tainted).\n", 1182 op->o_log_prefix, (void *)mc, buf ); 1183 } 1184 } 1185 1186 mc->mc_refcnt++; 1187 } 1188 } 1189 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); 1190 } 1191 1192 switch ( op->o_tag ) { 1193 case LDAP_REQ_ADD: 1194 /* if we go to selection, the entry must not exist, 1195 * and we must be able to resolve the parent */ 1196 dn_type = META_DNTYPE_PARENT; 1197 dnParent( &ndn, &pndn ); 1198 break; 1199 1200 case LDAP_REQ_MODRDN: 1201 /* if nnewSuperior is not NULL, it must resolve 1202 * to the same candidate as the req_ndn */ 1203 if ( op->orr_nnewSup ) { 1204 dn_type = META_DNTYPE_NEWPARENT; 1205 } 1206 break; 1207 1208 case LDAP_REQ_BIND: 1209 /* if bound as rootdn, the backend must bind to all targets 1210 * with the administrative identity 1211 * (unless pseoudoroot-bind-defer is TRUE) */ 1212 if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) { 1213 op_type = META_OP_REQUIRE_ALL; 1214 } 1215 break; 1216 1217 case LDAP_REQ_COMPARE: 1218 case LDAP_REQ_DELETE: 1219 case LDAP_REQ_MODIFY: 1220 /* just a unique candidate */ 1221 break; 1222 1223 case LDAP_REQ_SEARCH: 1224 /* allow multiple candidates for the searchBase */ 1225 op_type = META_OP_ALLOW_MULTIPLE; 1226 break; 1227 1228 default: 1229 /* right now, just break (exop?) */ 1230 break; 1231 } 1232 1233 /* 1234 * require all connections ... 1235 */ 1236 if ( op_type == META_OP_REQUIRE_ALL ) { 1237 1238 /* Looks like we didn't get a bind. Open a new session... */ 1239 if ( mc == NULL ) { 1240 assert( new_conn == 0 ); 1241 mc = metaconn_alloc( op ); 1242 mc->mc_conn = mc_curr.mc_conn; 1243 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn ); 1244 new_conn = 1; 1245 if ( sendok & LDAP_BACK_BINDING ) { 1246 LDAP_BACK_CONN_BINDING_SET( mc ); 1247 } 1248 if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) { 1249 LDAP_BACK_CONN_ISPRIV_SET( mc ); 1250 1251 } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) { 1252 LDAP_BACK_CONN_ISANON_SET( mc ); 1253 } 1254 1255 } else if ( 0 ) { 1256 /* TODO: if any of the connections is binding, 1257 * release mc and create a new one */ 1258 } 1259 1260 for ( i = 0; i < mi->mi_ntargets; i++ ) { 1261 /* 1262 * The target is activated; if needed, it is 1263 * also init'd 1264 */ 1265 candidates[ i ].sr_err = meta_back_init_one_conn( op, 1266 rs, mc, i, LDAP_BACK_CONN_ISPRIV( &mc_curr ), 1267 LDAP_BACK_DONTSEND, !new_conn ); 1268 if ( candidates[ i ].sr_err == LDAP_SUCCESS ) { 1269 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) { 1270 LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] ); 1271 } 1272 META_CANDIDATE_SET( &candidates[ i ] ); 1273 ncandidates++; 1274 1275 } else { 1276 1277 /* 1278 * FIXME: in case one target cannot 1279 * be init'd, should the other ones 1280 * be tried? 1281 */ 1282 META_CANDIDATE_RESET( &candidates[ i ] ); 1283 err = candidates[ i ].sr_err; 1284 continue; 1285 } 1286 } 1287 1288 if ( ncandidates == 0 ) { 1289 if ( new_conn ) { 1290 mc->mc_refcnt = 0; 1291 meta_back_conn_free( mc ); 1292 1293 } else { 1294 meta_back_release_conn( mi, mc ); 1295 } 1296 1297 rs->sr_err = LDAP_NO_SUCH_OBJECT; 1298 rs->sr_text = "Unable to select valid candidates"; 1299 1300 if ( sendok & LDAP_BACK_SENDERR ) { 1301 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) { 1302 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val; 1303 } 1304 send_ldap_result( op, rs ); 1305 rs->sr_matched = NULL; 1306 } 1307 1308 return NULL; 1309 } 1310 1311 goto done; 1312 } 1313 1314 /* 1315 * looks in cache, if any 1316 */ 1317 if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) { 1318 cached = i = meta_dncache_get_target( &mi->mi_cache, &op->o_req_ndn ); 1319 } 1320 1321 if ( op_type == META_OP_REQUIRE_SINGLE ) { 1322 metatarget_t *mt = NULL; 1323 metasingleconn_t *msc = NULL; 1324 1325 int j; 1326 1327 for ( j = 0; j < mi->mi_ntargets; j++ ) { 1328 META_CANDIDATE_RESET( &candidates[ j ] ); 1329 } 1330 1331 /* 1332 * tries to get a unique candidate 1333 * (takes care of default target) 1334 */ 1335 if ( i == META_TARGET_NONE ) { 1336 i = meta_back_get_candidate( op, rs, &ndn ); 1337 1338 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT && dn_type == META_DNTYPE_PARENT ) { 1339 i = meta_back_get_candidate( op, rs, &pndn ); 1340 } 1341 1342 if ( i < 0 || rs->sr_err != LDAP_SUCCESS ) { 1343 if ( mc != NULL ) { 1344 meta_back_release_conn( mi, mc ); 1345 } 1346 1347 if ( sendok & LDAP_BACK_SENDERR ) { 1348 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) { 1349 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val; 1350 } 1351 send_ldap_result( op, rs ); 1352 rs->sr_matched = NULL; 1353 } 1354 1355 return NULL; 1356 } 1357 } 1358 1359 if ( dn_type == META_DNTYPE_NEWPARENT && meta_back_get_candidate( op, rs, op->orr_nnewSup ) != i ) 1360 { 1361 if ( mc != NULL ) { 1362 meta_back_release_conn( mi, mc ); 1363 } 1364 1365 rs->sr_err = LDAP_UNWILLING_TO_PERFORM; 1366 rs->sr_text = "Cross-target rename not supported"; 1367 if ( sendok & LDAP_BACK_SENDERR ) { 1368 send_ldap_result( op, rs ); 1369 } 1370 1371 return NULL; 1372 } 1373 1374 Debug( LDAP_DEBUG_TRACE, 1375 "==>meta_back_getconn: got target=%d for ndn=\"%s\" from cache\n", 1376 i, op->o_req_ndn.bv_val ); 1377 1378 if ( mc == NULL ) { 1379 /* Retries searching for a metaconn in the avl tree 1380 * the reason is that the connection might have been 1381 * created by meta_back_get_candidate() */ 1382 if ( !( sendok & LDAP_BACK_BINDING ) ) { 1383 retry_lock2:; 1384 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex ); 1385 mc = (metaconn_t *)ldap_tavl_find( mi->mi_conninfo.lai_tree, 1386 (caddr_t)&mc_curr, meta_back_conndn_cmp ); 1387 if ( mc != NULL ) { 1388 /* catch taint errors */ 1389 assert( !LDAP_BACK_CONN_TAINTED( mc ) ); 1390 1391 /* Don't reuse connections while they're still binding */ 1392 if ( META_BACK_CONN_CREATING( &mc->mc_conns[ i ] ) 1393 || LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) ) 1394 { 1395 if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) { 1396 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); 1397 ldap_pvt_thread_yield(); 1398 goto retry_lock2; 1399 } 1400 1401 mc = NULL; 1402 1403 } else { 1404 mc->mc_refcnt++; 1405 } 1406 } 1407 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); 1408 } 1409 1410 /* Looks like we didn't get a bind. Open a new session... */ 1411 if ( mc == NULL ) { 1412 assert( new_conn == 0 ); 1413 mc = metaconn_alloc( op ); 1414 mc->mc_conn = mc_curr.mc_conn; 1415 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn ); 1416 new_conn = 1; 1417 if ( sendok & LDAP_BACK_BINDING ) { 1418 LDAP_BACK_CONN_BINDING_SET( mc ); 1419 } 1420 if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) { 1421 LDAP_BACK_CONN_ISPRIV_SET( mc ); 1422 1423 } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) { 1424 LDAP_BACK_CONN_ISANON_SET( mc ); 1425 } 1426 } 1427 } 1428 1429 /* 1430 * Clear all other candidates 1431 */ 1432 ( void )meta_clear_unused_candidates( op, i, candidates ); 1433 1434 mt = mi->mi_targets[ i ]; 1435 msc = &mc->mc_conns[ i ]; 1436 1437 /* 1438 * The target is activated; if needed, it is 1439 * also init'd. In case of error, meta_back_init_one_conn 1440 * sends the appropriate result. 1441 */ 1442 err = meta_back_init_one_conn( op, rs, mc, i, 1443 LDAP_BACK_CONN_ISPRIV( &mc_curr ), sendok, !new_conn ); 1444 if ( err != LDAP_SUCCESS ) { 1445 /* 1446 * FIXME: in case one target cannot 1447 * be init'd, should the other ones 1448 * be tried? 1449 */ 1450 META_CANDIDATE_RESET( &candidates[ i ] ); 1451 if ( new_conn ) { 1452 mc->mc_refcnt = 0; 1453 meta_back_conn_free( mc ); 1454 1455 } else { 1456 meta_back_release_conn( mi, mc ); 1457 } 1458 return NULL; 1459 } 1460 1461 if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) { 1462 LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] ); 1463 } 1464 1465 candidates[ i ].sr_err = LDAP_SUCCESS; 1466 META_CANDIDATE_SET( &candidates[ i ] ); 1467 ncandidates++; 1468 1469 if ( candidate ) { 1470 *candidate = i; 1471 } 1472 1473 /* 1474 * if no unique candidate ... 1475 */ 1476 } else { 1477 1478 /* Looks like we didn't get a bind. Open a new session... */ 1479 if ( mc == NULL ) { 1480 assert( new_conn == 0 ); 1481 mc = metaconn_alloc( op ); 1482 mc->mc_conn = mc_curr.mc_conn; 1483 ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn ); 1484 new_conn = 1; 1485 if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) { 1486 LDAP_BACK_CONN_ISPRIV_SET( mc ); 1487 1488 } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) { 1489 LDAP_BACK_CONN_ISANON_SET( mc ); 1490 } 1491 } 1492 1493 for ( i = 0; i < mi->mi_ntargets; i++ ) { 1494 metatarget_t *mt = mi->mi_targets[ i ]; 1495 1496 META_CANDIDATE_RESET( &candidates[ i ] ); 1497 1498 if ( i == cached 1499 || meta_back_is_candidate( mt, &op->o_req_ndn, 1500 op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_SUBTREE ) ) 1501 { 1502 1503 /* 1504 * The target is activated; if needed, it is 1505 * also init'd 1506 */ 1507 int lerr = meta_back_init_one_conn( op, rs, mc, i, 1508 LDAP_BACK_CONN_ISPRIV( &mc_curr ), 1509 LDAP_BACK_DONTSEND, !new_conn ); 1510 candidates[ i ].sr_err = lerr; 1511 if ( lerr == LDAP_SUCCESS ) { 1512 META_CANDIDATE_SET( &candidates[ i ] ); 1513 ncandidates++; 1514 1515 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d]\n", 1516 op->o_log_prefix, i ); 1517 1518 } else if ( lerr == LDAP_UNAVAILABLE && !META_BACK_ONERR_STOP( mi ) ) { 1519 META_CANDIDATE_SET( &candidates[ i ] ); 1520 1521 Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] %s\n", 1522 op->o_log_prefix, i, 1523 mt->mt_isquarantined != LDAP_BACK_FQ_NO ? "quarantined" : "unavailable" ); 1524 1525 } else { 1526 1527 /* 1528 * FIXME: in case one target cannot 1529 * be init'd, should the other ones 1530 * be tried? 1531 */ 1532 if ( new_conn ) { 1533 ( void )meta_clear_one_candidate( op, mc, i ); 1534 } 1535 /* leave the target candidate, but record the error for later use */ 1536 err = lerr; 1537 1538 if ( lerr == LDAP_UNAVAILABLE && mt->mt_isquarantined != LDAP_BACK_FQ_NO ) { 1539 Log( LDAP_DEBUG_TRACE, ldap_syslog_level, "%s: meta_back_getconn[%d] quarantined err=%d text=%s\n", 1540 op->o_log_prefix, i, lerr, rs->sr_text ); 1541 1542 } else { 1543 Log( LDAP_DEBUG_ANY, ldap_syslog, "%s: meta_back_getconn[%d] failed err=%d text=%s\n", 1544 op->o_log_prefix, i, lerr, rs->sr_text ); 1545 } 1546 1547 if ( META_BACK_ONERR_STOP( mi ) ) { 1548 if ( sendok & LDAP_BACK_SENDERR ) { 1549 send_ldap_result( op, rs ); 1550 } 1551 if ( new_conn ) { 1552 mc->mc_refcnt = 0; 1553 meta_back_conn_free( mc ); 1554 1555 } else { 1556 meta_back_release_conn( mi, mc ); 1557 } 1558 1559 return NULL; 1560 } 1561 1562 continue; 1563 } 1564 1565 } else { 1566 if ( new_conn ) { 1567 ( void )meta_clear_one_candidate( op, mc, i ); 1568 } 1569 } 1570 } 1571 1572 if ( ncandidates == 0 ) { 1573 if ( new_conn ) { 1574 mc->mc_refcnt = 0; 1575 meta_back_conn_free( mc ); 1576 1577 } else { 1578 meta_back_release_conn( mi, mc ); 1579 } 1580 1581 if ( rs->sr_err == LDAP_SUCCESS ) { 1582 rs->sr_err = LDAP_NO_SUCH_OBJECT; 1583 rs->sr_text = "Unable to select valid candidates"; 1584 } 1585 1586 if ( sendok & LDAP_BACK_SENDERR ) { 1587 if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) { 1588 rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val; 1589 } 1590 send_ldap_result( op, rs ); 1591 rs->sr_matched = NULL; 1592 } 1593 1594 return NULL; 1595 } 1596 } 1597 1598 done:; 1599 /* clear out meta_back_init_one_conn non-fatal errors */ 1600 rs->sr_err = LDAP_SUCCESS; 1601 rs->sr_text = NULL; 1602 1603 /* touch the timestamp */ 1604 if ( mi->mi_idle_timeout != 0 ) { 1605 mc->mc_time = op->o_time; 1606 } 1607 1608 if ( new_conn ) { 1609 if ( mi->mi_conn_ttl ) { 1610 mc->mc_create_time = op->o_time; 1611 } 1612 1613 /* 1614 * Inserts the newly created metaconn in the avl tree 1615 */ 1616 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex ); 1617 #if META_BACK_PRINT_CONNTREE > 0 1618 meta_back_print_conntree( mi, ">>> meta_back_getconn" ); 1619 #endif /* META_BACK_PRINT_CONNTREE */ 1620 1621 err = 0; 1622 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) { 1623 if ( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num < mi->mi_conn_priv_max ) { 1624 LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q ); 1625 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num++; 1626 LDAP_BACK_CONN_CACHED_SET( mc ); 1627 1628 } else { 1629 LDAP_BACK_CONN_TAINTED_SET( mc ); 1630 } 1631 rs->sr_err = 0; 1632 1633 } else if ( !( sendok & LDAP_BACK_BINDING ) ) { 1634 err = ldap_tavl_insert( &mi->mi_conninfo.lai_tree, ( caddr_t )mc, 1635 meta_back_conndn_cmp, meta_back_conndn_dup ); 1636 LDAP_BACK_CONN_CACHED_SET( mc ); 1637 } 1638 1639 #if META_BACK_PRINT_CONNTREE > 0 1640 meta_back_print_conntree( mi, "<<< meta_back_getconn" ); 1641 #endif /* META_BACK_PRINT_CONNTREE */ 1642 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); 1643 1644 if ( !LDAP_BACK_PCONN_ISPRIV( mc ) ) { 1645 /* 1646 * Err could be -1 in case a duplicate metaconn is inserted 1647 */ 1648 switch ( err ) { 1649 case 0: 1650 break; 1651 1652 case -1: 1653 LDAP_BACK_CONN_CACHED_CLEAR( mc ); 1654 /* duplicate: free and try to get the newly created one */ 1655 if ( !( sendok & LDAP_BACK_BINDING ) && !LDAP_BACK_USE_TEMPORARIES( mi ) ) { 1656 mc->mc_refcnt = 0; 1657 meta_back_conn_free( mc ); 1658 1659 new_conn = 0; 1660 goto retry_lock; 1661 } 1662 1663 LDAP_BACK_CONN_TAINTED_SET( mc ); 1664 break; 1665 1666 default: 1667 LDAP_BACK_CONN_CACHED_CLEAR( mc ); 1668 if ( LogTest( LDAP_DEBUG_ANY ) ) { 1669 char buf[STRLENOF("4294967295U") + 1] = { 0 }; 1670 mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) ); 1671 1672 Debug( LDAP_DEBUG_ANY, 1673 "%s meta_back_getconn: candidates=%d conn=%s insert failed\n", 1674 op->o_log_prefix, ncandidates, buf ); 1675 } 1676 1677 mc->mc_refcnt = 0; 1678 meta_back_conn_free( mc ); 1679 1680 rs->sr_err = LDAP_OTHER; 1681 rs->sr_text = "Proxy bind collision"; 1682 if ( sendok & LDAP_BACK_SENDERR ) { 1683 send_ldap_result( op, rs ); 1684 } 1685 return NULL; 1686 } 1687 } 1688 1689 if ( LogTest( LDAP_DEBUG_TRACE ) ) { 1690 char buf[STRLENOF("4294967295U") + 1] = { 0 }; 1691 mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) ); 1692 1693 Debug( LDAP_DEBUG_TRACE, 1694 "%s meta_back_getconn: candidates=%d conn=%s inserted\n", 1695 op->o_log_prefix, ncandidates, buf ); 1696 } 1697 1698 } else { 1699 if ( LogTest( LDAP_DEBUG_TRACE ) ) { 1700 char buf[STRLENOF("4294967295U") + 1] = { 0 }; 1701 mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) ); 1702 1703 Debug( LDAP_DEBUG_TRACE, 1704 "%s meta_back_getconn: candidates=%d conn=%s fetched\n", 1705 op->o_log_prefix, ncandidates, buf ); 1706 } 1707 } 1708 1709 return mc; 1710 } 1711 1712 void 1713 meta_back_release_conn_lock( 1714 metainfo_t *mi, 1715 metaconn_t *mc, 1716 int dolock ) 1717 { 1718 assert( mc != NULL ); 1719 1720 if ( dolock ) { 1721 ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex ); 1722 } 1723 assert( mc->mc_refcnt > 0 ); 1724 mc->mc_refcnt--; 1725 /* NOTE: the connection is removed if either it is tainted 1726 * or if it is shared and no one else is using it. This needs 1727 * to occur because for intrinsic reasons cached connections 1728 * that are not privileged would live forever and pollute 1729 * the connection space (and eat up resources). Maybe this 1730 * should be configurable... */ 1731 if ( LDAP_BACK_CONN_TAINTED( mc ) || !LDAP_BACK_CONN_CACHED( mc ) ) { 1732 #if META_BACK_PRINT_CONNTREE > 0 1733 meta_back_print_conntree( mi, ">>> meta_back_release_conn" ); 1734 #endif /* META_BACK_PRINT_CONNTREE */ 1735 1736 if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) { 1737 if ( mc->mc_q.tqe_prev != NULL ) { 1738 assert( LDAP_BACK_CONN_CACHED( mc ) ); 1739 assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 ); 1740 LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q ); 1741 mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--; 1742 LDAP_TAILQ_ENTRY_INIT( mc, mc_q ); 1743 1744 } else { 1745 assert( !LDAP_BACK_CONN_CACHED( mc ) ); 1746 } 1747 1748 } else if ( LDAP_BACK_CONN_CACHED( mc ) ) { 1749 metaconn_t *tmpmc; 1750 1751 tmpmc = ldap_tavl_delete( &mi->mi_conninfo.lai_tree, 1752 ( caddr_t )mc, meta_back_conndnmc_cmp ); 1753 1754 /* Overparanoid, but useful... */ 1755 assert( tmpmc == NULL || tmpmc == mc ); 1756 } 1757 1758 LDAP_BACK_CONN_CACHED_CLEAR( mc ); 1759 1760 #if META_BACK_PRINT_CONNTREE > 0 1761 meta_back_print_conntree( mi, "<<< meta_back_release_conn" ); 1762 #endif /* META_BACK_PRINT_CONNTREE */ 1763 1764 if ( mc->mc_refcnt == 0 ) { 1765 meta_back_conn_free( mc ); 1766 mc = NULL; 1767 } 1768 } 1769 1770 if ( mc != NULL && LDAP_BACK_CONN_BINDING( mc ) ) { 1771 LDAP_BACK_CONN_BINDING_CLEAR( mc ); 1772 } 1773 1774 if ( dolock ) { 1775 ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); 1776 } 1777 } 1778 1779 void 1780 meta_back_quarantine( 1781 Operation *op, 1782 SlapReply *rs, 1783 int candidate ) 1784 { 1785 metainfo_t *mi = (metainfo_t *)op->o_bd->be_private; 1786 metatarget_t *mt = mi->mi_targets[ candidate ]; 1787 1788 slap_retry_info_t *ri = &mt->mt_quarantine; 1789 1790 ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex ); 1791 1792 if ( rs->sr_err == LDAP_UNAVAILABLE ) { 1793 time_t new_last = slap_get_time(); 1794 1795 switch ( mt->mt_isquarantined ) { 1796 case LDAP_BACK_FQ_NO: 1797 if ( ri->ri_last == new_last ) { 1798 goto done; 1799 } 1800 1801 Debug( LDAP_DEBUG_ANY, 1802 "%s meta_back_quarantine[%d]: enter.\n", 1803 op->o_log_prefix, candidate ); 1804 1805 ri->ri_idx = 0; 1806 ri->ri_count = 0; 1807 break; 1808 1809 case LDAP_BACK_FQ_RETRYING: 1810 Debug(LDAP_DEBUG_ANY, 1811 "%s meta_back_quarantine[%d]: block #%d try #%d failed.\n", 1812 op->o_log_prefix, candidate, ri->ri_idx, 1813 ri->ri_count ); 1814 1815 ++ri->ri_count; 1816 if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER 1817 && ri->ri_count == ri->ri_num[ ri->ri_idx ] ) 1818 { 1819 ri->ri_count = 0; 1820 ++ri->ri_idx; 1821 } 1822 break; 1823 1824 default: 1825 goto done; 1826 } 1827 1828 mt->mt_isquarantined = LDAP_BACK_FQ_YES; 1829 ri->ri_last = new_last; 1830 1831 } else if ( mt->mt_isquarantined == LDAP_BACK_FQ_RETRYING ) { 1832 Debug( LDAP_DEBUG_ANY, 1833 "%s meta_back_quarantine[%d]: exit.\n", 1834 op->o_log_prefix, candidate ); 1835 1836 if ( mi->mi_quarantine_f ) { 1837 (void)mi->mi_quarantine_f( mi, candidate, 1838 mi->mi_quarantine_p ); 1839 } 1840 1841 ri->ri_count = 0; 1842 ri->ri_idx = 0; 1843 mt->mt_isquarantined = LDAP_BACK_FQ_NO; 1844 } 1845 1846 done:; 1847 ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex ); 1848 } 1849
Indexes created Wed Aug 05 00:25:39 UTC 2026