/* $NetBSD: conn.c,v 1.1.1.6.6.1 2019/08/10 06:17:19 martin Exp $ */ /* $OpenLDAP$ */ /* This work is part of OpenLDAP Software . * * Copyright 1999-2019 The OpenLDAP Foundation. * Portions Copyright 2001-2003 Pierangelo Masarati. * Portions Copyright 1999-2003 Howard Chu. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted only as authorized by the OpenLDAP * Public License. * * A copy of this license is available in the file LICENSE in the * top-level directory of the distribution or, alternatively, at * . */ /* ACKNOWLEDGEMENTS: * This work was initially developed by the Howard Chu for inclusion * in OpenLDAP Software and subsequently enhanced by Pierangelo * Masarati. */ #include __RCSID("$NetBSD: conn.c,v 1.1.1.6.6.1 2019/08/10 06:17:19 martin Exp $"); #include "portable.h" #include #include #include #include #define AVL_INTERNAL #include "slap.h" #include "../back-ldap/back-ldap.h" #include "back-meta.h" /* * meta_back_conndn_cmp * * compares two struct metaconn based on the value of the conn pointer * and of the local DN; used by avl stuff */ int meta_back_conndn_cmp( const void *c1, const void *c2 ) { metaconn_t *mc1 = ( metaconn_t * )c1; metaconn_t *mc2 = ( metaconn_t * )c2; int rc; /* If local DNs don't match, it is definitely not a match */ /* For shared sessions, conn is NULL. Only explicitly * bound sessions will have non-NULL conn. */ rc = SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn ); if ( rc == 0 ) { rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn ); } return rc; } /* * meta_back_conndnmc_cmp * * compares two struct metaconn based on the value of the conn pointer, * the local DN and the struct pointer; used by avl stuff */ static int meta_back_conndnmc_cmp( const void *c1, const void *c2 ) { metaconn_t *mc1 = ( metaconn_t * )c1; metaconn_t *mc2 = ( metaconn_t * )c2; int rc; /* If local DNs don't match, it is definitely not a match */ /* For shared sessions, conn is NULL. Only explicitly * bound sessions will have non-NULL conn. */ rc = SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn ); if ( rc == 0 ) { rc = ber_bvcmp( &mc1->mc_local_ndn, &mc2->mc_local_ndn ); if ( rc == 0 ) { rc = SLAP_PTRCMP( mc1, mc2 ); } } return rc; } /* * meta_back_conn_cmp * * compares two struct metaconn based on the value of the conn pointer; * used by avl stuff */ int meta_back_conn_cmp( const void *c1, const void *c2 ) { metaconn_t *mc1 = ( metaconn_t * )c1; metaconn_t *mc2 = ( metaconn_t * )c2; /* For shared sessions, conn is NULL. Only explicitly * bound sessions will have non-NULL conn. */ return SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn ); } /* * meta_back_conndn_dup * * returns -1 in case a duplicate struct metaconn has been inserted; * used by avl stuff */ int meta_back_conndn_dup( void *c1, void *c2 ) { metaconn_t *mc1 = ( metaconn_t * )c1; metaconn_t *mc2 = ( metaconn_t * )c2; /* Cannot have more than one shared session with same DN */ if ( mc1->mc_conn == mc2->mc_conn && dn_match( &mc1->mc_local_ndn, &mc2->mc_local_ndn ) ) { return -1; } return 0; } /* * Debug stuff (got it from libavl) */ #if META_BACK_PRINT_CONNTREE > 0 static void meta_back_print( metaconn_t *mc, char *avlstr ) { int i; fputs( "targets=[", stderr ); for ( i = 0; i < mc->mc_info->mi_ntargets; i++ ) { fputc( mc->mc_conns[ i ].msc_ld ? '*' : 'o', stderr); } fputc( ']', stderr ); fprintf( stderr, " mc=%p local=\"%s\" conn=%p refcnt=%d%s %s\n", (void *)mc, mc->mc_local_ndn.bv_val ? mc->mc_local_ndn.bv_val : "", (void *)mc->mc_conn, mc->mc_refcnt, LDAP_BACK_CONN_TAINTED( mc ) ? " tainted" : "", avlstr ); } static void meta_back_ravl_print( Avlnode *root, int depth ) { int i; if ( root == 0 ) { return; } meta_back_ravl_print( root->avl_right, depth + 1 ); for ( i = 0; i < depth; i++ ) { fprintf( stderr, "-" ); } fputc( ' ', stderr ); meta_back_print( (metaconn_t *)root->avl_data, avl_bf2str( root->avl_bf ) ); meta_back_ravl_print( root->avl_left, depth + 1 ); } /* NOTE: duplicate from back-ldap/bind.c */ static char* priv2str[] = { "privileged", "privileged/TLS", "anonymous", "anonymous/TLS", "bind", "bind/TLS", NULL }; void meta_back_print_conntree( metainfo_t *mi, char *msg ) { int c; fprintf( stderr, "========> %s\n", msg ); for ( c = LDAP_BACK_PCONN_FIRST; c < LDAP_BACK_PCONN_LAST; c++ ) { int i = 0; metaconn_t *mc; fprintf( stderr, " %s[%d]\n", priv2str[ c ], mi->mi_conn_priv[ c ].mic_num ); LDAP_TAILQ_FOREACH( mc, &mi->mi_conn_priv[ c ].mic_priv, mc_q ) { fprintf( stderr, " [%d] ", i ); meta_back_print( mc, "" ); i++; } } if ( mi->mi_conninfo.lai_tree == NULL ) { fprintf( stderr, "\t(empty)\n" ); } else { meta_back_ravl_print( mi->mi_conninfo.lai_tree, 0 ); } fprintf( stderr, "<======== %s\n", msg ); } #endif /* META_BACK_PRINT_CONNTREE */ /* * End of debug stuff */ /* * metaconn_alloc * * Allocates a connection structure, making room for all the referenced targets */ static metaconn_t * metaconn_alloc( Operation *op ) { metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private; metaconn_t *mc; int ntargets = mi->mi_ntargets; assert( ntargets > 0 ); /* malloc all in one */ mc = ( metaconn_t * )ch_calloc( 1, sizeof( metaconn_t ) + sizeof( metasingleconn_t ) * ( ntargets - 1 ) ); if ( mc == NULL ) { return NULL; } mc->mc_info = mi; mc->mc_authz_target = META_BOUND_NONE; mc->mc_refcnt = 1; return mc; } /* * meta_back_init_one_conn * * Initializes one connection */ int meta_back_init_one_conn( Operation *op, SlapReply *rs, metaconn_t *mc, int candidate, int ispriv, ldap_back_send_t sendok, int dolock ) { metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private; metatarget_t *mt = mi->mi_targets[ candidate ]; metasingleconn_t *msc = &mc->mc_conns[ candidate ]; int version; dncookie dc; int isauthz = ( candidate == mc->mc_authz_target ); int do_return = 0; #ifdef HAVE_TLS int is_ldaps = 0; int do_start_tls = 0; #endif /* HAVE_TLS */ /* if the server is quarantined, and * - the current interval did not expire yet, or * - no more retries should occur, * don't return the connection */ if ( mt->mt_isquarantined ) { slap_retry_info_t *ri = &mt->mt_quarantine; int dont_retry = 0; if ( mt->mt_quarantine.ri_interval ) { ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex ); dont_retry = ( mt->mt_isquarantined > LDAP_BACK_FQ_NO ); if ( dont_retry ) { dont_retry = ( ri->ri_num[ ri->ri_idx ] == SLAP_RETRYNUM_TAIL || slap_get_time() < ri->ri_last + ri->ri_interval[ ri->ri_idx ] ); if ( !dont_retry ) { if ( LogTest( LDAP_DEBUG_ANY ) ) { char buf[ SLAP_TEXT_BUFLEN ]; snprintf( buf, sizeof( buf ), "meta_back_init_one_conn[%d]: quarantine " "retry block #%d try #%d", candidate, ri->ri_idx, ri->ri_count ); Debug( LDAP_DEBUG_ANY, "%s %s.\n", op->o_log_prefix, buf, 0 ); } mt->mt_isquarantined = LDAP_BACK_FQ_RETRYING; } } ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex ); } if ( dont_retry ) { rs->sr_err = LDAP_UNAVAILABLE; if ( op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) { rs->sr_text = "Target is quarantined"; send_ldap_result( op, rs ); } return rs->sr_err; } } retry_lock:; if ( dolock ) { ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex ); } /* * Already init'ed */ if ( LDAP_BACK_CONN_ISBOUND( msc ) || LDAP_BACK_CONN_ISANON( msc ) ) { assert( msc->msc_ld != NULL ); rs->sr_err = LDAP_SUCCESS; do_return = 1; } else if ( META_BACK_CONN_CREATING( msc ) || LDAP_BACK_CONN_BINDING( msc ) ) { if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) { if ( dolock ) { ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); } ldap_pvt_thread_yield(); goto retry_lock; } /* sounds more appropriate */ rs->sr_err = LDAP_BUSY; rs->sr_text = "No connections to target are available"; do_return = 1; } else if ( META_BACK_CONN_INITED( msc ) ) { assert( msc->msc_ld != NULL ); rs->sr_err = LDAP_SUCCESS; do_return = 1; } else { /* * creating... */ META_BACK_CONN_CREATING_SET( msc ); } if ( dolock ) { ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); } if ( do_return ) { if ( rs->sr_err != LDAP_SUCCESS && op->o_conn && ( sendok & LDAP_BACK_SENDERR ) ) { send_ldap_result( op, rs ); } return rs->sr_err; } assert( msc->msc_ld == NULL ); /* * Attempts to initialize the connection to the target ds */ ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex ); rs->sr_err = ldap_initialize( &msc->msc_ld, mt->mt_uri ); #ifdef HAVE_TLS is_ldaps = ldap_is_ldaps_url( mt->mt_uri ); #endif /* HAVE_TLS */ ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex ); if ( rs->sr_err != LDAP_SUCCESS ) { goto error_return; } /* * Set LDAP version. This will always succeed: If the client * bound with a particular version, then so can we. */ if ( mt->mt_version != 0 ) { version = mt->mt_version; } else if ( op->o_conn->c_protocol != 0 ) { version = op->o_conn->c_protocol; } else { version = LDAP_VERSION3; } ldap_set_option( msc->msc_ld, LDAP_OPT_PROTOCOL_VERSION, &version ); ldap_set_urllist_proc( msc->msc_ld, mt->mt_urllist_f, mt->mt_urllist_p ); /* automatically chase referrals ("chase-referrals [{yes|no}]" statement) */ ldap_set_option( msc->msc_ld, LDAP_OPT_REFERRALS, META_BACK_TGT_CHASE_REFERRALS( mt ) ? LDAP_OPT_ON : LDAP_OPT_OFF ); slap_client_keepalive(msc->msc_ld, &mt->mt_tls.sb_keepalive); #ifdef HAVE_TLS { slap_bindconf *sb = NULL; if ( ispriv ) { sb = &mt->mt_idassert.si_bc; } else { sb = &mt->mt_tls; } if ( sb->sb_tls_do_init ) { bindconf_tls_set( sb, msc->msc_ld ); } else if ( sb->sb_tls_ctx ) { ldap_set_option( msc->msc_ld, LDAP_OPT_X_TLS_CTX, sb->sb_tls_ctx ); } if ( !is_ldaps ) { if ( sb == &mt->mt_idassert.si_bc && sb->sb_tls_ctx ) { do_start_tls = 1; } else if ( META_BACK_TGT_USE_TLS( mt ) || ( op->o_conn->c_is_tls && META_BACK_TGT_PROPAGATE_TLS( mt ) ) ) { do_start_tls = 1; } } } /* start TLS ("tls [try-]{start|propagate}" statement) */ if ( do_start_tls ) { #ifdef SLAP_STARTTLS_ASYNCHRONOUS /* * use asynchronous StartTLS; in case, chase referral * FIXME: OpenLDAP does not return referral on StartTLS yet */ int msgid; rs->sr_err = ldap_start_tls( msc->msc_ld, NULL, NULL, &msgid ); if ( rs->sr_err == LDAP_SUCCESS ) { LDAPMessage *res = NULL; int rc, nretries = mt->mt_nretries; struct timeval tv; LDAP_BACK_TV_SET( &tv ); retry:; rc = ldap_result( msc->msc_ld, msgid, LDAP_MSG_ALL, &tv, &res ); switch ( rc ) { case -1: rs->sr_err = LDAP_UNAVAILABLE; rs->sr_text = "Remote server down"; break; case 0: if ( nretries != 0 ) { if ( nretries > 0 ) { nretries--; } LDAP_BACK_TV_SET( &tv ); goto retry; } rs->sr_err = LDAP_OTHER; rs->sr_text = "Timeout, no more retries"; break; default: /* only touch when activity actually took place... */ if ( mi->mi_idle_timeout != 0 && msc->msc_time < op->o_time ) { msc->msc_time = op->o_time; } break; } if ( rc == LDAP_RES_EXTENDED ) { struct berval *data = NULL; /* NOTE: right now, data is unused, so don't get it */ rs->sr_err = ldap_parse_extended_result( msc->msc_ld, res, NULL, NULL /* &data */ , 0 ); if ( rs->sr_err == LDAP_SUCCESS ) { int err; /* FIXME: matched? referrals? response controls? */ rs->sr_err = ldap_parse_result( msc->msc_ld, res, &err, NULL, NULL, NULL, NULL, 1 ); res = NULL; if ( rs->sr_err == LDAP_SUCCESS ) { rs->sr_err = err; } rs->sr_err = slap_map_api2result( rs ); /* FIXME: in case a referral * is returned, should we try * using it instead of the * configured URI? */ if ( rs->sr_err == LDAP_SUCCESS ) { ldap_install_tls( msc->msc_ld ); } else if ( rs->sr_err == LDAP_REFERRAL ) { /* FIXME: LDAP_OPERATIONS_ERROR? */ rs->sr_err = LDAP_OTHER; rs->sr_text = "Unwilling to chase referral " "returned by Start TLS exop"; } if ( data ) { ber_bvfree( data ); } } } else { rs->sr_err = LDAP_OTHER; rs->sr_text = "Unknown response to StartTLS request :" " an ExtendedResponse is expected"; } if ( res != NULL ) { ldap_msgfree( res ); } } #else /* ! SLAP_STARTTLS_ASYNCHRONOUS */ /* * use synchronous StartTLS */ rs->sr_err = ldap_start_tls_s( msc->msc_ld, NULL, NULL ); #endif /* ! SLAP_STARTTLS_ASYNCHRONOUS */ /* if StartTLS is requested, only attempt it if the URL * is not "ldaps://"; this may occur not only in case * of misconfiguration, but also when used in the chain * overlay, where the "uri" can be parsed out of a referral */ if ( rs->sr_err == LDAP_SERVER_DOWN || ( rs->sr_err != LDAP_SUCCESS && META_BACK_TGT_TLS_CRITICAL( mt ) ) ) { #ifdef DEBUG_205 Debug( LDAP_DEBUG_ANY, "### %s meta_back_init_one_conn(TLS) " "ldap_unbind_ext[%d] ld=%p\n", op->o_log_prefix, candidate, (void *)msc->msc_ld ); #endif /* DEBUG_205 */ /* need to trash a failed Start TLS */ meta_clear_one_candidate( op, mc, candidate ); goto error_return; } } #endif /* HAVE_TLS */ /* * Set the network timeout if set */ if ( mt->mt_network_timeout != 0 ) { struct timeval network_timeout; network_timeout.tv_usec = 0; network_timeout.tv_sec = mt->mt_network_timeout; ldap_set_option( msc->msc_ld, LDAP_OPT_NETWORK_TIMEOUT, (void *)&network_timeout ); } /* * If the connection DN is not null, an attempt to rewrite it is made */ if ( ispriv ) { if ( !BER_BVISNULL( &mt->mt_idassert_authcDN ) ) { ber_bvreplace( &msc->msc_bound_ndn, &mt->mt_idassert_authcDN ); if ( !BER_BVISNULL( &mt->mt_idassert_passwd ) ) { if ( !BER_BVISNULL( &msc->msc_cred ) ) { memset( msc->msc_cred.bv_val, 0, msc->msc_cred.bv_len ); } ber_bvreplace( &msc->msc_cred, &mt->mt_idassert_passwd ); } LDAP_BACK_CONN_ISIDASSERT_SET( msc ); } else { ber_bvreplace( &msc->msc_bound_ndn, &slap_empty_bv ); } } else { if ( !BER_BVISNULL( &msc->msc_cred ) ) { memset( msc->msc_cred.bv_val, 0, msc->msc_cred.bv_len ); ber_memfree_x( msc->msc_cred.bv_val, NULL ); BER_BVZERO( &msc->msc_cred ); } if ( !BER_BVISNULL( &msc->msc_bound_ndn ) ) { ber_memfree_x( msc->msc_bound_ndn.bv_val, NULL ); BER_BVZERO( &msc->msc_bound_ndn ); } if ( !BER_BVISEMPTY( &op->o_ndn ) && SLAP_IS_AUTHZ_BACKEND( op ) && isauthz ) { dc.target = mt; dc.conn = op->o_conn; dc.rs = rs; dc.ctx = "bindDN"; /* * Rewrite the bind dn if needed */ if ( ldap_back_dn_massage( &dc, &op->o_conn->c_dn, &msc->msc_bound_ndn ) ) { #ifdef DEBUG_205 Debug( LDAP_DEBUG_ANY, "### %s meta_back_init_one_conn(rewrite) " "ldap_unbind_ext[%d] ld=%p\n", op->o_log_prefix, candidate, (void *)msc->msc_ld ); #endif /* DEBUG_205 */ /* need to trash a connection not fully established */ meta_clear_one_candidate( op, mc, candidate ); goto error_return; } /* copy the DN if needed */ if ( msc->msc_bound_ndn.bv_val == op->o_conn->c_dn.bv_val ) { ber_dupbv( &msc->msc_bound_ndn, &op->o_conn->c_dn ); } assert( !BER_BVISNULL( &msc->msc_bound_ndn ) ); } else { ber_dupbv( &msc->msc_bound_ndn, (struct berval *)&slap_empty_bv ); } } assert( !BER_BVISNULL( &msc->msc_bound_ndn ) ); error_return:; if ( dolock ) { ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex ); } META_BACK_CONN_CREATING_CLEAR( msc ); if ( rs->sr_err == LDAP_SUCCESS ) { /* * Sets a cookie for the rewrite session */ ( void )rewrite_session_init( mt->mt_rwmap.rwm_rw, op->o_conn ); META_BACK_CONN_INITED_SET( msc ); } if ( dolock ) { ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); } if ( rs->sr_err != LDAP_SUCCESS ) { /* Get the error message and print it in TRACE mode */ if ( LogTest( LDAP_DEBUG_TRACE ) ) { Log4( LDAP_DEBUG_TRACE, ldap_syslog_level, "%s: meta_back_init_one_conn[%d] failed err=%d text=%s\n", op->o_log_prefix, candidate, rs->sr_err, rs->sr_text ); } rs->sr_err = slap_map_api2result( rs ); if ( sendok & LDAP_BACK_SENDERR ) { send_ldap_result( op, rs ); } } return rs->sr_err; } /* * meta_back_retry * * Retries one connection */ int meta_back_retry( Operation *op, SlapReply *rs, metaconn_t **mcp, int candidate, ldap_back_send_t sendok ) { metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private; metatarget_t *mt = mi->mi_targets[ candidate ]; metaconn_t *mc = *mcp; metasingleconn_t *msc = &mc->mc_conns[ candidate ]; int rc = LDAP_UNAVAILABLE, binding, quarantine = 1; ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex ); assert( !META_BACK_CONN_CREATING( msc ) ); binding = LDAP_BACK_CONN_BINDING( msc ); LDAP_BACK_CONN_BINDING_CLEAR( msc ); assert( mc->mc_refcnt > 0 ); if ( mc->mc_refcnt == 1 ) { struct berval save_cred; if ( LogTest( LDAP_DEBUG_ANY ) ) { char buf[ SLAP_TEXT_BUFLEN ]; /* this lock is required; however, * it's invoked only when logging is on */ ldap_pvt_thread_mutex_lock( &mt->mt_uri_mutex ); snprintf( buf, sizeof( buf ), "retrying URI=\"%s\" DN=\"%s\"", mt->mt_uri, BER_BVISNULL( &msc->msc_bound_ndn ) ? "" : msc->msc_bound_ndn.bv_val ); ldap_pvt_thread_mutex_unlock( &mt->mt_uri_mutex ); Debug( LDAP_DEBUG_ANY, "%s meta_back_retry[%d]: %s.\n", op->o_log_prefix, candidate, buf ); } /* save credentials, if any, for later use; * meta_clear_one_candidate() would free them */ save_cred = msc->msc_cred; BER_BVZERO( &msc->msc_cred ); meta_clear_one_candidate( op, mc, candidate ); LDAP_BACK_CONN_ISBOUND_CLEAR( msc ); ( void )rewrite_session_delete( mt->mt_rwmap.rwm_rw, op->o_conn ); /* mc here must be the regular mc, reset and ready for init */ rc = meta_back_init_one_conn( op, rs, mc, candidate, LDAP_BACK_CONN_ISPRIV( mc ), sendok, 0 ); /* restore credentials, if any and if needed; * meta_back_init_one_conn() restores msc_bound_ndn, if any; * if no msc_bound_ndn is restored, destroy credentials */ if ( !BER_BVISNULL( &msc->msc_bound_ndn ) && BER_BVISNULL( &msc->msc_cred ) ) { msc->msc_cred = save_cred; } else if ( !BER_BVISNULL( &save_cred ) ) { memset( save_cred.bv_val, 0, save_cred.bv_len ); ber_memfree_x( save_cred.bv_val, NULL ); } /* restore the "binding" flag, in case */ if ( binding ) { LDAP_BACK_CONN_BINDING_SET( msc ); } if ( rc == LDAP_SUCCESS ) { quarantine = 0; LDAP_BACK_CONN_BINDING_SET( msc ); binding = 1; rc = meta_back_single_dobind( op, rs, mcp, candidate, sendok, mt->mt_nretries, 0 ); Debug( LDAP_DEBUG_ANY, "%s meta_back_retry[%d]: " "meta_back_single_dobind=%d\n", op->o_log_prefix, candidate, rc ); if ( rc == LDAP_SUCCESS ) { if ( !BER_BVISNULL( &msc->msc_bound_ndn ) && !BER_BVISEMPTY( &msc->msc_bound_ndn ) ) { LDAP_BACK_CONN_ISBOUND_SET( msc ); } else { LDAP_BACK_CONN_ISANON_SET( msc ); } /* when bound, dispose of the "binding" flag */ if ( binding ) { LDAP_BACK_CONN_BINDING_CLEAR( msc ); } } } #if 0 /* ITS#7591, following stmt drops needed result msgs */ /* don't send twice */ sendok &= ~LDAP_BACK_SENDERR; #endif } if ( rc != LDAP_SUCCESS ) { SlapReply *candidates = meta_back_candidates_get( op ); candidates[ candidate ].sr_err = rc; if ( *mcp != NULL ) { if ( mc->mc_refcnt == 1 ) { if ( binding ) { LDAP_BACK_CONN_BINDING_CLEAR( msc ); } (void)meta_clear_one_candidate( op, mc, candidate ); } LDAP_BACK_CONN_TAINTED_SET( mc ); /* only release if mandatory; otherwise * let the caller do what's best before * releasing */ if ( META_BACK_ONERR_STOP( mi ) ) { meta_back_release_conn_lock( mi, mc, 0 ); *mcp = NULL; } else { #if META_BACK_PRINT_CONNTREE > 0 meta_back_print_conntree( mi, ">>> meta_back_retry" ); #endif /* META_BACK_PRINT_CONNTREE */ /* FIXME: could be done better, reworking meta_back_release_conn_lock() */ if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) { if ( mc->mc_q.tqe_prev != NULL ) { assert( LDAP_BACK_CONN_CACHED( mc ) ); assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 ); LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q ); mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--; LDAP_TAILQ_ENTRY_INIT( mc, mc_q ); } else { assert( !LDAP_BACK_CONN_CACHED( mc ) ); } } else { /* FIXME: check if in tree, for consistency? */ (void)avl_delete( &mi->mi_conninfo.lai_tree, ( caddr_t )mc, meta_back_conndnmc_cmp ); } LDAP_BACK_CONN_CACHED_CLEAR( mc ); #if META_BACK_PRINT_CONNTREE > 0 meta_back_print_conntree( mi, "<<< meta_back_retry" ); #endif /* META_BACK_PRINT_CONNTREE */ } } if ( sendok & LDAP_BACK_SENDERR ) { rs->sr_err = rc; rs->sr_text = "Unable to retry"; send_ldap_result( op, rs ); } } if ( quarantine && META_BACK_TGT_QUARANTINE( mt ) ) { meta_back_quarantine( op, rs, candidate ); } ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); return rc == LDAP_SUCCESS ? 1 : 0; } /* * callback for unique candidate selection */ static int meta_back_conn_cb( Operation *op, SlapReply *rs ) { assert( op->o_tag == LDAP_REQ_SEARCH ); switch ( rs->sr_type ) { case REP_SEARCH: ((long *)op->o_callback->sc_private)[0] = (long)op->o_private; break; case REP_SEARCHREF: case REP_RESULT: break; default: return rs->sr_err; } return 0; } static int meta_back_get_candidate( Operation *op, SlapReply *rs, struct berval *ndn ) { metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private; long candidate; /* * tries to get a unique candidate * (takes care of default target) */ candidate = meta_back_select_unique_candidate( mi, ndn ); /* * if any is found, inits the connection */ if ( candidate == META_TARGET_NONE ) { rs->sr_err = LDAP_NO_SUCH_OBJECT; rs->sr_text = "No suitable candidate target found"; } else if ( candidate == META_TARGET_MULTIPLE ) { Operation op2 = *op; SlapReply rs2 = { REP_RESULT }; slap_callback cb2 = { 0 }; int rc; /* try to get a unique match for the request ndn * among the multiple candidates available */ op2.o_tag = LDAP_REQ_SEARCH; op2.o_req_dn = *ndn; op2.o_req_ndn = *ndn; op2.ors_scope = LDAP_SCOPE_BASE; op2.ors_deref = LDAP_DEREF_NEVER; op2.ors_attrs = slap_anlist_no_attrs; op2.ors_attrsonly = 0; op2.ors_limit = NULL; op2.ors_slimit = 1; op2.ors_tlimit = SLAP_NO_LIMIT; op2.ors_filter = (Filter *)slap_filter_objectClass_pres; op2.ors_filterstr = *slap_filterstr_objectClass_pres; op2.o_callback = &cb2; cb2.sc_response = meta_back_conn_cb; cb2.sc_private = (void *)&candidate; rc = op->o_bd->be_search( &op2, &rs2 ); switch ( rs2.sr_err ) { case LDAP_SUCCESS: default: rs->sr_err = rs2.sr_err; break; case LDAP_SIZELIMIT_EXCEEDED: /* if multiple candidates can serve the operation, * and a default target is defined, and it is * a candidate, try using it (FIXME: YMMV) */ if ( mi->mi_defaulttarget != META_DEFAULT_TARGET_NONE && meta_back_is_candidate( mi->mi_targets[ mi->mi_defaulttarget ], ndn, op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_BASE ) ) { candidate = mi->mi_defaulttarget; rs->sr_err = LDAP_SUCCESS; rs->sr_text = NULL; } else { rs->sr_err = LDAP_UNWILLING_TO_PERFORM; rs->sr_text = "Unable to select unique candidate target"; } break; } } else { rs->sr_err = LDAP_SUCCESS; } return candidate; } static void *meta_back_candidates_dummy; static void meta_back_candidates_keyfree( void *key, void *data ) { metacandidates_t *mc = (metacandidates_t *)data; ber_memfree_x( mc->mc_candidates, NULL ); ber_memfree_x( data, NULL ); } SlapReply * meta_back_candidates_get( Operation *op ) { metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private; metacandidates_t *mc; if ( op->o_threadctx ) { void *data = NULL; ldap_pvt_thread_pool_getkey( op->o_threadctx, &meta_back_candidates_dummy, &data, NULL ); mc = (metacandidates_t *)data; } else { mc = mi->mi_candidates; } if ( mc == NULL ) { mc = ch_calloc( sizeof( metacandidates_t ), 1 ); mc->mc_ntargets = mi->mi_ntargets; mc->mc_candidates = ch_calloc( sizeof( SlapReply ), mc->mc_ntargets ); if ( op->o_threadctx ) { void *data = NULL; data = (void *)mc; ldap_pvt_thread_pool_setkey( op->o_threadctx, &meta_back_candidates_dummy, data, meta_back_candidates_keyfree, NULL, NULL ); } else { mi->mi_candidates = mc; } } else if ( mc->mc_ntargets < mi->mi_ntargets ) { /* NOTE: in the future, may want to allow back-config * to add/remove targets from back-meta... */ mc->mc_candidates = ch_realloc( mc->mc_candidates, sizeof( SlapReply ) * mi->mi_ntargets ); memset( &mc->mc_candidates[ mc->mc_ntargets ], 0, sizeof( SlapReply ) * ( mi->mi_ntargets - mc->mc_ntargets ) ); mc->mc_ntargets = mi->mi_ntargets; } return mc->mc_candidates; } /* * meta_back_getconn * * Prepares the connection structure * * RATIONALE: * * - determine what DN is being requested: * * op requires candidate checks * * add unique parent of o_req_ndn * bind unique^*[/all] o_req_ndn [no check] * compare unique^+ o_req_ndn * delete unique o_req_ndn * modify unique o_req_ndn * search any o_req_ndn * modrdn unique[, unique] o_req_ndn[, orr_nnewSup] * * - for ops that require the candidate to be unique, in case of multiple * occurrences an internal search with sizeLimit=1 is performed * if a unique candidate can actually be determined. If none is found, * the operation aborts; if multiple are found, the default target * is used if defined and candidate; otherwise the operation aborts. * * *^note: actually, the bind operation is handled much like a search; * i.e. the bind is broadcast to all candidate targets. * * +^note: actually, the compare operation is handled much like a search; * i.e. the compare is broadcast to all candidate targets, while checking * that exactly none (noSuchObject) or one (TRUE/FALSE/UNDEFINED) is * returned. */ metaconn_t * meta_back_getconn( Operation *op, SlapReply *rs, int *candidate, ldap_back_send_t sendok ) { metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private; metaconn_t *mc = NULL, mc_curr = {{ 0 }}; int cached = META_TARGET_NONE, i = META_TARGET_NONE, err = LDAP_SUCCESS, new_conn = 0, ncandidates = 0; meta_op_type op_type = META_OP_REQUIRE_SINGLE; enum { META_DNTYPE_ENTRY, META_DNTYPE_PARENT, META_DNTYPE_NEWPARENT } dn_type = META_DNTYPE_ENTRY; struct berval ndn = op->o_req_ndn, pndn; SlapReply *candidates = meta_back_candidates_get( op ); /* Internal searches are privileged and shared. So is root. */ if ( ( !BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ALWAYS( mi ) ) || ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_ANON( mi ) ) || op->o_do_not_cache || be_isroot( op ) ) { LDAP_BACK_CONN_ISPRIV_SET( &mc_curr ); mc_curr.mc_local_ndn = op->o_bd->be_rootndn; LDAP_BACK_PCONN_ROOTDN_SET( &mc_curr, op ); } else if ( BER_BVISEMPTY( &op->o_ndn ) && META_BACK_PROXYAUTHZ_NOANON( mi ) ) { LDAP_BACK_CONN_ISANON_SET( &mc_curr ); BER_BVSTR( &mc_curr.mc_local_ndn, "" ); LDAP_BACK_PCONN_ANON_SET( &mc_curr, op ); } else { mc_curr.mc_local_ndn = op->o_ndn; /* Explicit binds must not be shared */ if ( !BER_BVISEMPTY( &op->o_ndn ) || op->o_tag == LDAP_REQ_BIND || SLAP_IS_AUTHZ_BACKEND( op ) ) { mc_curr.mc_conn = op->o_conn; } else { LDAP_BACK_CONN_ISANON_SET( &mc_curr ); LDAP_BACK_PCONN_ANON_SET( &mc_curr, op ); } } /* Explicit Bind requests always get their own conn */ if ( sendok & LDAP_BACK_BINDING ) { mc_curr.mc_conn = op->o_conn; } else { /* Searches for a metaconn in the avl tree */ retry_lock:; ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex ); if ( LDAP_BACK_PCONN_ISPRIV( &mc_curr ) ) { /* lookup a conn that's not binding */ LDAP_TAILQ_FOREACH( mc, &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv, mc_q ) { if ( !LDAP_BACK_CONN_BINDING( mc ) && mc->mc_refcnt == 0 ) { break; } } if ( mc != NULL ) { /* move to tail of queue */ if ( mc != LDAP_TAILQ_LAST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc_conn_priv_q ) ) { LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q ); LDAP_TAILQ_ENTRY_INIT( mc, mc_q ); LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q ); } } else if ( !LDAP_BACK_USE_TEMPORARIES( mi ) && mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_num == mi->mi_conn_priv_max ) { mc = LDAP_TAILQ_FIRST( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( &mc_curr ) ].mic_priv ); } } else { mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree, (caddr_t)&mc_curr, meta_back_conndn_cmp ); } if ( mc ) { /* catch taint errors */ assert( !LDAP_BACK_CONN_TAINTED( mc ) ); /* Don't reuse connections while they're still binding * NOTE: only makes sense for binds */ if ( LDAP_BACK_CONN_BINDING( mc ) ) { if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) { ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); ldap_pvt_thread_yield(); goto retry_lock; } /* release conn, and create a temporary */ mc = NULL; } else { if ( mc->mc_refcnt == 0 && (( mi->mi_conn_ttl != 0 && op->o_time > mc->mc_create_time + mi->mi_conn_ttl ) || ( mi->mi_idle_timeout != 0 && op->o_time > mc->mc_time + mi->mi_idle_timeout )) ) { #if META_BACK_PRINT_CONNTREE > 0 meta_back_print_conntree( mi, ">>> meta_back_getconn(expired)" ); #endif /* META_BACK_PRINT_CONNTREE */ /* don't let anyone else use this expired connection */ if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) { if ( mc->mc_q.tqe_prev != NULL ) { assert( LDAP_BACK_CONN_CACHED( mc ) ); assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 ); LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q ); mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--; LDAP_TAILQ_ENTRY_INIT( mc, mc_q ); } else { assert( !LDAP_BACK_CONN_CACHED( mc ) ); } } else { (void)avl_delete( &mi->mi_conninfo.lai_tree, (caddr_t)mc, meta_back_conndnmc_cmp ); } #if META_BACK_PRINT_CONNTREE > 0 meta_back_print_conntree( mi, "<<< meta_back_getconn(expired)" ); #endif /* META_BACK_PRINT_CONNTREE */ LDAP_BACK_CONN_TAINTED_SET( mc ); LDAP_BACK_CONN_CACHED_CLEAR( mc ); if ( LogTest( LDAP_DEBUG_TRACE ) ) { char buf[STRLENOF("4294967295U") + 1] = { 0 }; mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) ); Debug( LDAP_DEBUG_TRACE, "%s meta_back_getconn: mc=%p conn=%s expired (tainted).\n", op->o_log_prefix, (void *)mc, buf ); } } mc->mc_refcnt++; } } ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); } switch ( op->o_tag ) { case LDAP_REQ_ADD: /* if we go to selection, the entry must not exist, * and we must be able to resolve the parent */ dn_type = META_DNTYPE_PARENT; dnParent( &ndn, &pndn ); break; case LDAP_REQ_MODRDN: /* if nnewSuperior is not NULL, it must resolve * to the same candidate as the req_ndn */ if ( op->orr_nnewSup ) { dn_type = META_DNTYPE_NEWPARENT; } break; case LDAP_REQ_BIND: /* if bound as rootdn, the backend must bind to all targets * with the administrative identity * (unless pseoudoroot-bind-defer is TRUE) */ if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) { op_type = META_OP_REQUIRE_ALL; } break; case LDAP_REQ_COMPARE: case LDAP_REQ_DELETE: case LDAP_REQ_MODIFY: /* just a unique candidate */ break; case LDAP_REQ_SEARCH: /* allow multiple candidates for the searchBase */ op_type = META_OP_ALLOW_MULTIPLE; break; default: /* right now, just break (exop?) */ break; } /* * require all connections ... */ if ( op_type == META_OP_REQUIRE_ALL ) { /* Looks like we didn't get a bind. Open a new session... */ if ( mc == NULL ) { assert( new_conn == 0 ); mc = metaconn_alloc( op ); mc->mc_conn = mc_curr.mc_conn; ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn ); new_conn = 1; if ( sendok & LDAP_BACK_BINDING ) { LDAP_BACK_CONN_BINDING_SET( mc ); } if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) { LDAP_BACK_CONN_ISPRIV_SET( mc ); } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) { LDAP_BACK_CONN_ISANON_SET( mc ); } } else if ( 0 ) { /* TODO: if any of the connections is binding, * release mc and create a new one */ } for ( i = 0; i < mi->mi_ntargets; i++ ) { /* * The target is activated; if needed, it is * also init'd */ candidates[ i ].sr_err = meta_back_init_one_conn( op, rs, mc, i, LDAP_BACK_CONN_ISPRIV( &mc_curr ), LDAP_BACK_DONTSEND, !new_conn ); if ( candidates[ i ].sr_err == LDAP_SUCCESS ) { if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) { LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] ); } META_CANDIDATE_SET( &candidates[ i ] ); ncandidates++; } else { /* * FIXME: in case one target cannot * be init'd, should the other ones * be tried? */ META_CANDIDATE_RESET( &candidates[ i ] ); err = candidates[ i ].sr_err; continue; } } if ( ncandidates == 0 ) { if ( new_conn ) { mc->mc_refcnt = 0; meta_back_conn_free( mc ); } else { meta_back_release_conn( mi, mc ); } rs->sr_err = LDAP_NO_SUCH_OBJECT; rs->sr_text = "Unable to select valid candidates"; if ( sendok & LDAP_BACK_SENDERR ) { if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) { rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val; } send_ldap_result( op, rs ); rs->sr_matched = NULL; } return NULL; } goto done; } /* * looks in cache, if any */ if ( mi->mi_cache.ttl != META_DNCACHE_DISABLED ) { cached = i = meta_dncache_get_target( &mi->mi_cache, &op->o_req_ndn ); } if ( op_type == META_OP_REQUIRE_SINGLE ) { metatarget_t *mt = NULL; metasingleconn_t *msc = NULL; int j; for ( j = 0; j < mi->mi_ntargets; j++ ) { META_CANDIDATE_RESET( &candidates[ j ] ); } /* * tries to get a unique candidate * (takes care of default target) */ if ( i == META_TARGET_NONE ) { i = meta_back_get_candidate( op, rs, &ndn ); if ( rs->sr_err == LDAP_NO_SUCH_OBJECT && dn_type == META_DNTYPE_PARENT ) { i = meta_back_get_candidate( op, rs, &pndn ); } if ( i < 0 || rs->sr_err != LDAP_SUCCESS ) { if ( mc != NULL ) { meta_back_release_conn( mi, mc ); } if ( sendok & LDAP_BACK_SENDERR ) { if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) { rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val; } send_ldap_result( op, rs ); rs->sr_matched = NULL; } return NULL; } } if ( dn_type == META_DNTYPE_NEWPARENT && meta_back_get_candidate( op, rs, op->orr_nnewSup ) != i ) { if ( mc != NULL ) { meta_back_release_conn( mi, mc ); } rs->sr_err = LDAP_UNWILLING_TO_PERFORM; rs->sr_text = "Cross-target rename not supported"; if ( sendok & LDAP_BACK_SENDERR ) { send_ldap_result( op, rs ); } return NULL; } Debug( LDAP_DEBUG_TRACE, "==>meta_back_getconn: got target=%d for ndn=\"%s\" from cache\n", i, op->o_req_ndn.bv_val, 0 ); if ( mc == NULL ) { /* Retries searching for a metaconn in the avl tree * the reason is that the connection might have been * created by meta_back_get_candidate() */ if ( !( sendok & LDAP_BACK_BINDING ) ) { retry_lock2:; ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex ); mc = (metaconn_t *)avl_find( mi->mi_conninfo.lai_tree, (caddr_t)&mc_curr, meta_back_conndn_cmp ); if ( mc != NULL ) { /* catch taint errors */ assert( !LDAP_BACK_CONN_TAINTED( mc ) ); /* Don't reuse connections while they're still binding */ if ( META_BACK_CONN_CREATING( &mc->mc_conns[ i ] ) || LDAP_BACK_CONN_BINDING( &mc->mc_conns[ i ] ) ) { if ( !LDAP_BACK_USE_TEMPORARIES( mi ) ) { ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); ldap_pvt_thread_yield(); goto retry_lock2; } mc = NULL; } else { mc->mc_refcnt++; } } ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); } /* Looks like we didn't get a bind. Open a new session... */ if ( mc == NULL ) { assert( new_conn == 0 ); mc = metaconn_alloc( op ); mc->mc_conn = mc_curr.mc_conn; ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn ); new_conn = 1; if ( sendok & LDAP_BACK_BINDING ) { LDAP_BACK_CONN_BINDING_SET( mc ); } if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) { LDAP_BACK_CONN_ISPRIV_SET( mc ); } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) { LDAP_BACK_CONN_ISANON_SET( mc ); } } } /* * Clear all other candidates */ ( void )meta_clear_unused_candidates( op, i ); mt = mi->mi_targets[ i ]; msc = &mc->mc_conns[ i ]; /* * The target is activated; if needed, it is * also init'd. In case of error, meta_back_init_one_conn * sends the appropriate result. */ err = meta_back_init_one_conn( op, rs, mc, i, LDAP_BACK_CONN_ISPRIV( &mc_curr ), sendok, !new_conn ); if ( err != LDAP_SUCCESS ) { /* * FIXME: in case one target cannot * be init'd, should the other ones * be tried? */ META_CANDIDATE_RESET( &candidates[ i ] ); if ( new_conn ) { mc->mc_refcnt = 0; meta_back_conn_free( mc ); } else { meta_back_release_conn( mi, mc ); } return NULL; } if ( new_conn && ( sendok & LDAP_BACK_BINDING ) ) { LDAP_BACK_CONN_BINDING_SET( &mc->mc_conns[ i ] ); } candidates[ i ].sr_err = LDAP_SUCCESS; META_CANDIDATE_SET( &candidates[ i ] ); ncandidates++; if ( candidate ) { *candidate = i; } /* * if no unique candidate ... */ } else { /* Looks like we didn't get a bind. Open a new session... */ if ( mc == NULL ) { assert( new_conn == 0 ); mc = metaconn_alloc( op ); mc->mc_conn = mc_curr.mc_conn; ber_dupbv( &mc->mc_local_ndn, &mc_curr.mc_local_ndn ); new_conn = 1; if ( LDAP_BACK_CONN_ISPRIV( &mc_curr ) ) { LDAP_BACK_CONN_ISPRIV_SET( mc ); } else if ( LDAP_BACK_CONN_ISANON( &mc_curr ) ) { LDAP_BACK_CONN_ISANON_SET( mc ); } } for ( i = 0; i < mi->mi_ntargets; i++ ) { metatarget_t *mt = mi->mi_targets[ i ]; META_CANDIDATE_RESET( &candidates[ i ] ); if ( i == cached || meta_back_is_candidate( mt, &op->o_req_ndn, op->o_tag == LDAP_REQ_SEARCH ? op->ors_scope : LDAP_SCOPE_SUBTREE ) ) { /* * The target is activated; if needed, it is * also init'd */ int lerr = meta_back_init_one_conn( op, rs, mc, i, LDAP_BACK_CONN_ISPRIV( &mc_curr ), LDAP_BACK_DONTSEND, !new_conn ); candidates[ i ].sr_err = lerr; if ( lerr == LDAP_SUCCESS ) { META_CANDIDATE_SET( &candidates[ i ] ); ncandidates++; Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d]\n", op->o_log_prefix, i, 0 ); } else if ( lerr == LDAP_UNAVAILABLE && !META_BACK_ONERR_STOP( mi ) ) { META_CANDIDATE_SET( &candidates[ i ] ); Debug( LDAP_DEBUG_TRACE, "%s: meta_back_getconn[%d] %s\n", op->o_log_prefix, i, mt->mt_isquarantined != LDAP_BACK_FQ_NO ? "quarantined" : "unavailable" ); } else { /* * FIXME: in case one target cannot * be init'd, should the other ones * be tried? */ if ( new_conn ) { ( void )meta_clear_one_candidate( op, mc, i ); } /* leave the target candidate, but record the error for later use */ err = lerr; if ( lerr == LDAP_UNAVAILABLE && mt->mt_isquarantined != LDAP_BACK_FQ_NO ) { Log4( LDAP_DEBUG_TRACE, ldap_syslog_level, "%s: meta_back_getconn[%d] quarantined err=%d text=%s\n", op->o_log_prefix, i, lerr, rs->sr_text ); } else { Log4( LDAP_DEBUG_ANY, ldap_syslog, "%s: meta_back_getconn[%d] failed err=%d text=%s\n", op->o_log_prefix, i, lerr, rs->sr_text ); } if ( META_BACK_ONERR_STOP( mi ) ) { if ( sendok & LDAP_BACK_SENDERR ) { send_ldap_result( op, rs ); } if ( new_conn ) { mc->mc_refcnt = 0; meta_back_conn_free( mc ); } else { meta_back_release_conn( mi, mc ); } return NULL; } continue; } } else { if ( new_conn ) { ( void )meta_clear_one_candidate( op, mc, i ); } } } if ( ncandidates == 0 ) { if ( new_conn ) { mc->mc_refcnt = 0; meta_back_conn_free( mc ); } else { meta_back_release_conn( mi, mc ); } if ( rs->sr_err == LDAP_SUCCESS ) { rs->sr_err = LDAP_NO_SUCH_OBJECT; rs->sr_text = "Unable to select valid candidates"; } if ( sendok & LDAP_BACK_SENDERR ) { if ( rs->sr_err == LDAP_NO_SUCH_OBJECT ) { rs->sr_matched = op->o_bd->be_suffix[ 0 ].bv_val; } send_ldap_result( op, rs ); rs->sr_matched = NULL; } return NULL; } } done:; /* clear out meta_back_init_one_conn non-fatal errors */ rs->sr_err = LDAP_SUCCESS; rs->sr_text = NULL; /* touch the timestamp */ if ( mi->mi_idle_timeout != 0 ) { mc->mc_time = op->o_time; } if ( new_conn ) { if ( mi->mi_conn_ttl ) { mc->mc_create_time = op->o_time; } /* * Inserts the newly created metaconn in the avl tree */ ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex ); #if META_BACK_PRINT_CONNTREE > 0 meta_back_print_conntree( mi, ">>> meta_back_getconn" ); #endif /* META_BACK_PRINT_CONNTREE */ err = 0; if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) { if ( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num < mi->mi_conn_priv_max ) { LDAP_TAILQ_INSERT_TAIL( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q ); mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num++; LDAP_BACK_CONN_CACHED_SET( mc ); } else { LDAP_BACK_CONN_TAINTED_SET( mc ); } rs->sr_err = 0; } else if ( !( sendok & LDAP_BACK_BINDING ) ) { err = avl_insert( &mi->mi_conninfo.lai_tree, ( caddr_t )mc, meta_back_conndn_cmp, meta_back_conndn_dup ); LDAP_BACK_CONN_CACHED_SET( mc ); } #if META_BACK_PRINT_CONNTREE > 0 meta_back_print_conntree( mi, "<<< meta_back_getconn" ); #endif /* META_BACK_PRINT_CONNTREE */ ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); if ( !LDAP_BACK_PCONN_ISPRIV( mc ) ) { /* * Err could be -1 in case a duplicate metaconn is inserted */ switch ( err ) { case 0: break; case -1: LDAP_BACK_CONN_CACHED_CLEAR( mc ); /* duplicate: free and try to get the newly created one */ if ( !( sendok & LDAP_BACK_BINDING ) && !LDAP_BACK_USE_TEMPORARIES( mi ) ) { mc->mc_refcnt = 0; meta_back_conn_free( mc ); new_conn = 0; goto retry_lock; } LDAP_BACK_CONN_TAINTED_SET( mc ); break; default: LDAP_BACK_CONN_CACHED_CLEAR( mc ); if ( LogTest( LDAP_DEBUG_ANY ) ) { char buf[STRLENOF("4294967295U") + 1] = { 0 }; mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) ); Debug( LDAP_DEBUG_ANY, "%s meta_back_getconn: candidates=%d conn=%s insert failed\n", op->o_log_prefix, ncandidates, buf ); } mc->mc_refcnt = 0; meta_back_conn_free( mc ); rs->sr_err = LDAP_OTHER; rs->sr_text = "Proxy bind collision"; if ( sendok & LDAP_BACK_SENDERR ) { send_ldap_result( op, rs ); } return NULL; } } if ( LogTest( LDAP_DEBUG_TRACE ) ) { char buf[STRLENOF("4294967295U") + 1] = { 0 }; mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) ); Debug( LDAP_DEBUG_TRACE, "%s meta_back_getconn: candidates=%d conn=%s inserted\n", op->o_log_prefix, ncandidates, buf ); } } else { if ( LogTest( LDAP_DEBUG_TRACE ) ) { char buf[STRLENOF("4294967295U") + 1] = { 0 }; mi->mi_ldap_extra->connid2str( &mc->mc_base, buf, sizeof(buf) ); Debug( LDAP_DEBUG_TRACE, "%s meta_back_getconn: candidates=%d conn=%s fetched\n", op->o_log_prefix, ncandidates, buf ); } } return mc; } void meta_back_release_conn_lock( metainfo_t *mi, metaconn_t *mc, int dolock ) { assert( mc != NULL ); if ( dolock ) { ldap_pvt_thread_mutex_lock( &mi->mi_conninfo.lai_mutex ); } assert( mc->mc_refcnt > 0 ); mc->mc_refcnt--; /* NOTE: the connection is removed if either it is tainted * or if it is shared and no one else is using it. This needs * to occur because for intrinsic reasons cached connections * that are not privileged would live forever and pollute * the connection space (and eat up resources). Maybe this * should be configurable... */ if ( LDAP_BACK_CONN_TAINTED( mc ) || !LDAP_BACK_CONN_CACHED( mc ) ) { #if META_BACK_PRINT_CONNTREE > 0 meta_back_print_conntree( mi, ">>> meta_back_release_conn" ); #endif /* META_BACK_PRINT_CONNTREE */ if ( LDAP_BACK_PCONN_ISPRIV( mc ) ) { if ( mc->mc_q.tqe_prev != NULL ) { assert( LDAP_BACK_CONN_CACHED( mc ) ); assert( mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num > 0 ); LDAP_TAILQ_REMOVE( &mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_priv, mc, mc_q ); mi->mi_conn_priv[ LDAP_BACK_CONN2PRIV( mc ) ].mic_num--; LDAP_TAILQ_ENTRY_INIT( mc, mc_q ); } else { assert( !LDAP_BACK_CONN_CACHED( mc ) ); } } else if ( LDAP_BACK_CONN_CACHED( mc ) ) { metaconn_t *tmpmc; tmpmc = avl_delete( &mi->mi_conninfo.lai_tree, ( caddr_t )mc, meta_back_conndnmc_cmp ); /* Overparanoid, but useful... */ assert( tmpmc == NULL || tmpmc == mc ); } LDAP_BACK_CONN_CACHED_CLEAR( mc ); #if META_BACK_PRINT_CONNTREE > 0 meta_back_print_conntree( mi, "<<< meta_back_release_conn" ); #endif /* META_BACK_PRINT_CONNTREE */ if ( mc->mc_refcnt == 0 ) { meta_back_conn_free( mc ); mc = NULL; } } if ( mc != NULL && LDAP_BACK_CONN_BINDING( mc ) ) { LDAP_BACK_CONN_BINDING_CLEAR( mc ); } if ( dolock ) { ldap_pvt_thread_mutex_unlock( &mi->mi_conninfo.lai_mutex ); } } void meta_back_quarantine( Operation *op, SlapReply *rs, int candidate ) { metainfo_t *mi = (metainfo_t *)op->o_bd->be_private; metatarget_t *mt = mi->mi_targets[ candidate ]; slap_retry_info_t *ri = &mt->mt_quarantine; ldap_pvt_thread_mutex_lock( &mt->mt_quarantine_mutex ); if ( rs->sr_err == LDAP_UNAVAILABLE ) { time_t new_last = slap_get_time(); switch ( mt->mt_isquarantined ) { case LDAP_BACK_FQ_NO: if ( ri->ri_last == new_last ) { goto done; } Debug( LDAP_DEBUG_ANY, "%s meta_back_quarantine[%d]: enter.\n", op->o_log_prefix, candidate, 0 ); ri->ri_idx = 0; ri->ri_count = 0; break; case LDAP_BACK_FQ_RETRYING: if ( LogTest( LDAP_DEBUG_ANY ) ) { char buf[ SLAP_TEXT_BUFLEN ]; snprintf( buf, sizeof( buf ), "meta_back_quarantine[%d]: block #%d try #%d failed", candidate, ri->ri_idx, ri->ri_count ); Debug( LDAP_DEBUG_ANY, "%s %s.\n", op->o_log_prefix, buf, 0 ); } ++ri->ri_count; if ( ri->ri_num[ ri->ri_idx ] != SLAP_RETRYNUM_FOREVER && ri->ri_count == ri->ri_num[ ri->ri_idx ] ) { ri->ri_count = 0; ++ri->ri_idx; } break; default: break; } mt->mt_isquarantined = LDAP_BACK_FQ_YES; ri->ri_last = new_last; } else if ( mt->mt_isquarantined == LDAP_BACK_FQ_RETRYING ) { Debug( LDAP_DEBUG_ANY, "%s meta_back_quarantine[%d]: exit.\n", op->o_log_prefix, candidate, 0 ); if ( mi->mi_quarantine_f ) { (void)mi->mi_quarantine_f( mi, candidate, mi->mi_quarantine_p ); } ri->ri_count = 0; ri->ri_idx = 0; mt->mt_isquarantined = LDAP_BACK_FQ_NO; } done:; ldap_pvt_thread_mutex_unlock( &mt->mt_quarantine_mutex ); }