diff options
Diffstat (limited to 'servers/slapd/back-meta/conn.c')
| -rw-r--r-- | servers/slapd/back-meta/conn.c | 1910 |
1 files changed, 1910 insertions, 0 deletions
diff --git a/servers/slapd/back-meta/conn.c b/servers/slapd/back-meta/conn.c new file mode 100644 index 0000000..8a781e5 --- /dev/null +++ b/servers/slapd/back-meta/conn.c @@ -0,0 +1,1910 @@ +/* $OpenLDAP$ */ +/* This work is part of OpenLDAP Software <http://www.openldap.org/>. + * + * Copyright 1999-2018 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 + * <http://www.OpenLDAP.org/license.html>. + */ +/* ACKNOWLEDGEMENTS: + * This work was initially developed by the Howard Chu for inclusion + * in OpenLDAP Software and subsequently enhanced by Pierangelo + * Masarati. + */ + +#include "portable.h" + +#include <stdio.h> + +#include <ac/errno.h> +#include <ac/socket.h> +#include <ac/string.h> + + +#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 ); +} |