Adding upstream version 2.5.13+dfsg.upstream/2.5.13+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 782 insertions, 0 deletions

diff --git a/servers/slapd/back-asyncmeta/back-asyncmeta.h b/servers/slapd/back-asyncmeta/back-asyncmeta.h
new file mode 100644
index 0000000..f3ce06e
--- /dev/null
+++ b/servers/slapd/back-asyncmeta/back-asyncmeta.h
@@ -0,0 +1,782 @@
+/* back-asyncmeta.h - main header file for back-asyncmeta module */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2016-2022 The OpenLDAP Foundation.
+ * Portions Copyright 2016 Symas Corporation.
+ * 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 developed by Symas Corporation
+ * based on back-meta module for inclusion in OpenLDAP Software.
+ * This work was sponsored by Ericsson. */
+
+#ifndef SLAPD_LDAP_H
+#error "include servers/slapd/back-ldap/back-ldap.h before this file!"
+#endif /* SLAPD_LDAP_H */
+
+#ifndef SLAPD_ASYNCMETA_H
+#define SLAPD_ASYNCMETA_H
+
+#ifdef LDAP_DEVEL
+#define SLAPD_META_CLIENT_PR 1
+#endif /* LDAP_DEVEL */
+
+#include "proto-asyncmeta.h"
+
+#include "ldap_rq.h"
+
+LDAP_BEGIN_DECL
+
+/*
+ * Set META_BACK_PRINT_CONNTREE larger than 0 to dump the connection tree (debug only)
+ */
+#ifndef META_BACK_PRINT_CONNTREE
+#define META_BACK_PRINT_CONNTREE 0
+#endif /* !META_BACK_PRINT_CONNTREE */
+
+/*
+ * A a_metasingleconn_t can be in the following, mutually exclusive states:
+ *
+ *	- none			(0x0U)
+ *	- creating		META_BACK_FCONN_CREATING
+ *	- initialized		META_BACK_FCONN_INITED
+ *	- binding		LDAP_BACK_FCONN_BINDING
+ *	- bound/anonymous	LDAP_BACK_FCONN_ISBOUND/LDAP_BACK_FCONN_ISANON
+ *
+ * possible modifiers are:
+ *
+ *	- privileged		LDAP_BACK_FCONN_ISPRIV
+ *	- privileged, TLS	LDAP_BACK_FCONN_ISTLS
+ *	- subjected to idassert	LDAP_BACK_FCONN_ISIDASR
+ *	- tainted		LDAP_BACK_FCONN_TAINTED
+ */
+
+#define META_BACK_FCONN_INITED		(0x00100000U)
+#define META_BACK_FCONN_CREATING	(0x00200000U)
+#define META_BACK_FCONN_INVALID	        (0x00400000U)
+
+#define	META_BACK_CONN_INITED(lc)		LDAP_BACK_CONN_ISSET((lc), META_BACK_FCONN_INITED)
+#define	META_BACK_CONN_INITED_SET(lc)		LDAP_BACK_CONN_SET((lc), META_BACK_FCONN_INITED)
+#define	META_BACK_CONN_INITED_CLEAR(lc)		LDAP_BACK_CONN_CLEAR((lc), META_BACK_FCONN_INITED)
+#define	META_BACK_CONN_INITED_CPY(lc, mlc)	LDAP_BACK_CONN_CPY((lc), META_BACK_FCONN_INITED, (mlc))
+#define	META_BACK_CONN_CREATING(lc)		LDAP_BACK_CONN_ISSET((lc), META_BACK_FCONN_CREATING)
+#define	META_BACK_CONN_CREATING_SET(lc)		LDAP_BACK_CONN_SET((lc), META_BACK_FCONN_CREATING)
+#define	META_BACK_CONN_CREATING_CLEAR(lc)	LDAP_BACK_CONN_CLEAR((lc), META_BACK_FCONN_CREATING)
+#define	META_BACK_CONN_CREATING_CPY(lc, mlc)	LDAP_BACK_CONN_CPY((lc), META_BACK_FCONN_CREATING, (mlc))
+#define	META_BACK_CONN_INVALID(lc)		LDAP_BACK_CONN_ISSET((lc), META_BACK_FCONN_INVALID)
+#define	META_BACK_CONN_INVALID_SET(lc)		LDAP_BACK_CONN_SET((lc), META_BACK_FCONN_INVALID)
+#define	META_BACK_CONN_INVALID_CLEAR(lc)	LDAP_BACK_CONN_CLEAR((lc), META_BACK_FCONN_INVALID)
+
+struct a_metainfo_t;
+struct a_metaconn_t;
+struct a_metatarget_t;
+#define	META_NOT_CANDIDATE		((ber_tag_t)0x0)
+#define	META_CANDIDATE			((ber_tag_t)0x1)
+#define	META_BINDING			((ber_tag_t)0x2)
+#define	META_RETRYING			((ber_tag_t)0x4)
+
+typedef struct bm_context_t {
+	LDAP_STAILQ_ENTRY(bm_context_t) bc_next;
+	struct a_metaconn_t *bc_mc;
+	time_t			timeout;
+	time_t                  stoptime;
+	ldap_back_send_t	sendok;
+	ldap_back_send_t	retrying;
+	int candidate_match;
+	volatile int bc_active;
+	int searchtime;	/* stoptime is a search timelimit */
+	int is_ok;
+	int is_root;
+	volatile sig_atomic_t bc_invalid;
+	SlapReply		rs;
+	Operation		*op;
+	Operation               copy_op;
+	LDAPControl	        **ctrls;
+	int                     *msgids;
+	int                     *nretries;  /* number of times to retry a failed send on an msc */
+	struct berval	        c_peer_name; /* peer name of original op->o_conn*/
+	SlapReply               *candidates;
+} bm_context_t;
+
+typedef struct a_metasingleconn_t {
+#define META_CND_ISSET(rs,f)		( ( (rs)->sr_tag & (f) ) == (f) )
+#define META_CND_SET(rs,f)		( (rs)->sr_tag |= (f) )
+#define META_CND_CLEAR(rs,f)		( (rs)->sr_tag &= ~(f) )
+
+#define META_CANDIDATE_RESET(rs)	( (rs)->sr_tag = 0 )
+#define META_IS_CANDIDATE(rs)		META_CND_ISSET( (rs), META_CANDIDATE )
+#define META_CANDIDATE_SET(rs)		META_CND_SET( (rs), META_CANDIDATE )
+#define META_CANDIDATE_CLEAR(rs)	META_CND_CLEAR( (rs), META_CANDIDATE )
+#define META_IS_BINDING(rs)		META_CND_ISSET( (rs), META_BINDING )
+#define META_BINDING_SET(rs)		META_CND_SET( (rs), META_BINDING )
+#define META_BINDING_CLEAR(rs)		META_CND_CLEAR( (rs), META_BINDING )
+#define META_IS_RETRYING(rs)		META_CND_ISSET( (rs), META_RETRYING )
+#define META_RETRYING_SET(rs)		META_CND_SET( (rs), META_RETRYING )
+#define META_RETRYING_CLEAR(rs)		META_CND_CLEAR( (rs), META_RETRYING )
+
+	LDAP            	*msc_ld;
+	LDAP            	*msc_ldr;
+	time_t			msc_time;
+	time_t                  msc_binding_time;
+	time_t                  msc_result_time;
+	struct berval          	msc_bound_ndn;
+	struct berval		msc_cred;
+	unsigned		msc_mscflags;
+
+	/* NOTE: lc_lcflags is redefined to msc_mscflags to reuse the macros
+	 * defined for back-ldap */
+#define	lc_lcflags		msc_mscflags
+	volatile int msc_active;
+		/* Connection for the select */
+	Connection *conn;
+} a_metasingleconn_t;
+
+typedef struct a_metaconn_t {
+	ldapconn_base_t		lc_base;
+#define	mc_base			lc_base
+//#define	mc_conn			mc_base.lcb_conn
+//#define	mc_local_ndn		mc_base.lcb_local_ndn
+//#define	mc_refcnt		mc_base.lcb_refcnt
+//#define	mc_create_time		mc_base.lcb_create_time
+//#define	mc_time			mc_base.lcb_time
+
+	LDAP_TAILQ_ENTRY(a_metaconn_t)	mc_q;
+
+	/* NOTE: msc_mscflags is used to recycle the #define
+	 * in metasingleconn_t */
+	unsigned		msc_mscflags;
+	int	mc_active;
+
+	/*
+	 * means that the connection is bound;
+	 * of course only one target actually is ...
+	 */
+	int             	mc_authz_target;
+#define META_BOUND_NONE		(-1)
+#define META_BOUND_ALL		(-2)
+
+	struct a_metainfo_t	*mc_info;
+
+	int pending_ops;
+	ldap_pvt_thread_mutex_t	mc_om_mutex;
+	/* queue for pending operations */
+	LDAP_STAILQ_HEAD(BCList, bm_context_t) mc_om_list;
+	/* supersedes the connection stuff */
+	a_metasingleconn_t	*mc_conns;
+} a_metaconn_t;
+
+typedef enum meta_st_t {
+#if 0 /* todo */
+	META_ST_EXACT = LDAP_SCOPE_BASE,
+#endif
+	META_ST_SUBTREE = LDAP_SCOPE_SUBTREE,
+	META_ST_SUBORDINATE = LDAP_SCOPE_SUBORDINATE,
+	META_ST_REGEX /* last + 1 */
+} meta_st_t;
+
+typedef struct a_metasubtree_t {
+	meta_st_t ms_type;
+	union {
+		struct berval msu_dn;
+		struct {
+			struct berval msr_regex_pattern;
+			regex_t msr_regex;
+		} msu_regex;
+	} ms_un;
+#define ms_dn ms_un.msu_dn
+#define ms_regex ms_un.msu_regex.msr_regex
+#define ms_regex_pattern ms_un.msu_regex.msr_regex_pattern
+
+	struct a_metasubtree_t *ms_next;
+} a_metasubtree_t;
+
+typedef struct metafilter_t {
+	struct metafilter_t *mf_next;
+	struct berval mf_regex_pattern;
+	regex_t mf_regex;
+} metafilter_t;
+
+typedef struct a_metacommon_t {
+	int				mc_version;
+	int				mc_nretries;
+#define META_RETRY_UNDEFINED	(-2)
+#define META_RETRY_FOREVER	(-1)
+#define META_RETRY_NEVER	(0)
+#define META_RETRY_DEFAULT	(2)
+
+	unsigned		mc_flags;
+#define	META_BACK_CMN_ISSET(mc,f)		( ( (mc)->mc_flags & (f) ) == (f) )
+#define	META_BACK_CMN_QUARANTINE(mc)		META_BACK_CMN_ISSET( (mc), LDAP_BACK_F_QUARANTINE )
+#define	META_BACK_CMN_CHASE_REFERRALS(mc)	META_BACK_CMN_ISSET( (mc), LDAP_BACK_F_CHASE_REFERRALS )
+#define	META_BACK_CMN_NOREFS(mc)		META_BACK_CMN_ISSET( (mc), LDAP_BACK_F_NOREFS )
+#define	META_BACK_CMN_NOUNDEFFILTER(mc)		META_BACK_CMN_ISSET( (mc), LDAP_BACK_F_NOUNDEFFILTER )
+#define	META_BACK_CMN_SAVECRED(mc)		META_BACK_CMN_ISSET( (mc), LDAP_BACK_F_SAVECRED )
+#define	META_BACK_CMN_ST_REQUEST(mc)		META_BACK_CMN_ISSET( (mc), LDAP_BACK_F_ST_REQUEST )
+
+#ifdef SLAPD_META_CLIENT_PR
+	/*
+	 * client-side paged results:
+	 * -1: accept unsolicited paged results responses
+	 *  0: off
+	 * >0: always request paged results with size == mt_ps
+	 */
+#define META_CLIENT_PR_DISABLE			(0)
+#define META_CLIENT_PR_ACCEPT_UNSOLICITED	(-1)
+	ber_int_t		mc_ps;
+#endif /* SLAPD_META_CLIENT_PR */
+
+	slap_retry_info_t	mc_quarantine;
+	time_t			mc_network_timeout;
+	struct timeval	mc_bind_timeout;
+#define META_BIND_TIMEOUT	LDAP_BACK_RESULT_UTIMEOUT
+	time_t			mc_timeout[ SLAP_OP_LAST ];
+} a_metacommon_t;
+
+typedef struct a_metatarget_t {
+	char			*mt_uri;
+	ldap_pvt_thread_mutex_t	mt_uri_mutex;
+
+	/* TODO: we might want to enable different strategies
+	 * for different targets */
+	LDAP_REBIND_PROC	*mt_rebind_f;
+	LDAP_URLLIST_PROC	*mt_urllist_f;
+	void			*mt_urllist_p;
+
+	metafilter_t	*mt_filter;
+	a_metasubtree_t		*mt_subtree;
+	/* F: subtree-include; T: subtree-exclude */
+	int			mt_subtree_exclude;
+
+	int			mt_scope;
+
+	struct berval		mt_psuffix;		/* pretty suffix */
+	struct berval		mt_nsuffix;		/* normalized suffix */
+
+	struct berval		mt_lsuffixm;	/* local suffix for massage */
+	struct berval		mt_rsuffixm;	/* remote suffix for massage */
+
+	struct berval		mt_binddn;
+	struct berval		mt_bindpw;
+
+	/* we only care about the TLS options here */
+	slap_bindconf		mt_tls;
+
+	slap_idassert_t		mt_idassert;
+#define	mt_idassert_mode	mt_idassert.si_mode
+#define	mt_idassert_authcID	mt_idassert.si_bc.sb_authcId
+#define	mt_idassert_authcDN	mt_idassert.si_bc.sb_binddn
+#define	mt_idassert_passwd	mt_idassert.si_bc.sb_cred
+#define	mt_idassert_authzID	mt_idassert.si_bc.sb_authzId
+#define	mt_idassert_authmethod	mt_idassert.si_bc.sb_method
+#define	mt_idassert_sasl_mech	mt_idassert.si_bc.sb_saslmech
+#define	mt_idassert_sasl_realm	mt_idassert.si_bc.sb_realm
+#define	mt_idassert_secprops	mt_idassert.si_bc.sb_secprops
+#define	mt_idassert_tls		mt_idassert.si_bc.sb_tls
+#define	mt_idassert_flags	mt_idassert.si_flags
+#define	mt_idassert_authz	mt_idassert.si_authz
+
+	sig_atomic_t		mt_isquarantined;
+	ldap_pvt_thread_mutex_t	mt_quarantine_mutex;
+
+	a_metacommon_t	mt_mc;
+#define	mt_nretries	mt_mc.mc_nretries
+#define	mt_flags	mt_mc.mc_flags
+#define	mt_version	mt_mc.mc_version
+#define	mt_ps		mt_mc.mc_ps
+#define	mt_network_timeout	mt_mc.mc_network_timeout
+#define	mt_bind_timeout	mt_mc.mc_bind_timeout
+#define	mt_timeout	mt_mc.mc_timeout
+#define	mt_quarantine	mt_mc.mc_quarantine
+
+#define	META_BACK_TGT_ISSET(mt,f)		( ( (mt)->mt_flags & (f) ) == (f) )
+#define	META_BACK_TGT_ISMASK(mt,m,f)		( ( (mt)->mt_flags & (m) ) == (f) )
+
+#define META_BACK_TGT_SAVECRED(mt)		META_BACK_TGT_ISSET( (mt), LDAP_BACK_F_SAVECRED )
+
+#define META_BACK_TGT_USE_TLS(mt)		META_BACK_TGT_ISSET( (mt), LDAP_BACK_F_USE_TLS )
+#define META_BACK_TGT_PROPAGATE_TLS(mt)		META_BACK_TGT_ISSET( (mt), LDAP_BACK_F_PROPAGATE_TLS )
+#define META_BACK_TGT_TLS_CRITICAL(mt)		META_BACK_TGT_ISSET( (mt), LDAP_BACK_F_TLS_CRITICAL )
+
+#define META_BACK_TGT_CHASE_REFERRALS(mt)	META_BACK_TGT_ISSET( (mt), LDAP_BACK_F_CHASE_REFERRALS )
+
+#define	META_BACK_TGT_T_F(mt)			META_BACK_TGT_ISMASK( (mt), LDAP_BACK_F_T_F_MASK, LDAP_BACK_F_T_F )
+#define	META_BACK_TGT_T_F_DISCOVER(mt)		META_BACK_TGT_ISMASK( (mt), LDAP_BACK_F_T_F_MASK2, LDAP_BACK_F_T_F_DISCOVER )
+
+#define	META_BACK_TGT_ABANDON(mt)		META_BACK_TGT_ISMASK( (mt), LDAP_BACK_F_CANCEL_MASK, LDAP_BACK_F_CANCEL_ABANDON )
+#define	META_BACK_TGT_IGNORE(mt)		META_BACK_TGT_ISMASK( (mt), LDAP_BACK_F_CANCEL_MASK, LDAP_BACK_F_CANCEL_IGNORE )
+#define	META_BACK_TGT_CANCEL(mt)		META_BACK_TGT_ISMASK( (mt), LDAP_BACK_F_CANCEL_MASK, LDAP_BACK_F_CANCEL_EXOP )
+#define	META_BACK_TGT_CANCEL_DISCOVER(mt)	META_BACK_TGT_ISMASK( (mt), LDAP_BACK_F_CANCEL_MASK2, LDAP_BACK_F_CANCEL_EXOP_DISCOVER )
+#define	META_BACK_TGT_QUARANTINE(mt)		META_BACK_TGT_ISSET( (mt), LDAP_BACK_F_QUARANTINE )
+
+#ifdef SLAP_CONTROL_X_SESSION_TRACKING
+#define	META_BACK_TGT_ST_REQUEST(mt)		META_BACK_TGT_ISSET( (mt), LDAP_BACK_F_ST_REQUEST )
+#define	META_BACK_TGT_ST_RESPONSE(mt)		META_BACK_TGT_ISSET( (mt), LDAP_BACK_F_ST_RESPONSE )
+#endif /* SLAP_CONTROL_X_SESSION_TRACKING */
+
+#define	META_BACK_TGT_NOREFS(mt)		META_BACK_TGT_ISSET( (mt), LDAP_BACK_F_NOREFS )
+#define	META_BACK_TGT_NOUNDEFFILTER(mt)		META_BACK_TGT_ISSET( (mt), LDAP_BACK_F_NOUNDEFFILTER )
+
+#define META_BACK_CFG_MAX_PENDING_OPS		0x80
+#define META_BACK_CFG_MAX_TARGET_CONNS		0xFF
+#define META_BACK_CFG_DEFAULT_OPS_TIMEOUT	0x02
+
+/* the interval of the timeout checking loop in microseconds
+ * possibly make this configurable? */
+#define META_BACK_CFG_MAX_TIMEOUT_LOOP		0x70000
+	slap_mask_t		mt_rep_flags;
+	int			mt_timeout_ops;
+} a_metatarget_t;
+
+typedef struct a_metadncache_t {
+	ldap_pvt_thread_mutex_t mutex;
+	Avlnode			*tree;
+
+#define META_DNCACHE_DISABLED   (0)
+#define META_DNCACHE_FOREVER    ((time_t)(-1))
+	time_t			ttl;  /* seconds; 0: no cache, -1: no expiry */
+} a_metadncache_t;
+
+typedef struct a_metacandidates_t {
+	int			mc_ntargets;
+	SlapReply		*mc_candidates;
+} a_metacandidates_t;
+
+/*
+ * Hook to allow mucking with a_metainfo_t/a_metatarget_t when quarantine is over
+ */
+typedef int (*asyncmeta_quarantine_f)( struct a_metainfo_t *, int target, void * );
+
+struct meta_out_message_t;
+
+typedef struct a_metainfo_t {
+	int			mi_ntargets;
+	int			mi_defaulttarget;
+#define META_DEFAULT_TARGET_NONE	(-1)
+
+#define	mi_nretries	mi_mc.mc_nretries
+#define	mi_flags	mi_mc.mc_flags
+#define	mi_version	mi_mc.mc_version
+#define	mi_ps		mi_mc.mc_ps
+#define	mi_network_timeout	mi_mc.mc_network_timeout
+#define	mi_bind_timeout	mi_mc.mc_bind_timeout
+#define	mi_timeout	mi_mc.mc_timeout
+#define	mi_quarantine	mi_mc.mc_quarantine
+
+	a_metatarget_t		**mi_targets;
+	a_metacandidates_t	*mi_candidates;
+
+	LDAP_REBIND_PROC	*mi_rebind_f;
+	LDAP_URLLIST_PROC	*mi_urllist_f;
+
+	a_metadncache_t		mi_cache;
+
+	struct {
+		int						mic_num;
+		LDAP_TAILQ_HEAD(mc_conn_priv_q, a_metaconn_t)	mic_priv;
+	}			mi_conn_priv[ LDAP_BACK_PCONN_LAST ];
+	int			mi_conn_priv_max;
+
+	/* NOTE: quarantine uses the connection mutex */
+	asyncmeta_quarantine_f	mi_quarantine_f;
+	void			*mi_quarantine_p;
+
+#define	li_flags		mi_flags
+/* uses flags as defined in <back-ldap/back-ldap.h> */
+#define	META_BACK_F_ONERR_STOP		LDAP_BACK_F_ONERR_STOP
+#define	META_BACK_F_ONERR_REPORT	(0x02000000U)
+#define	META_BACK_F_ONERR_MASK		(META_BACK_F_ONERR_STOP|META_BACK_F_ONERR_REPORT)
+#define	META_BACK_F_DEFER_ROOTDN_BIND	(0x04000000U)
+#define	META_BACK_F_PROXYAUTHZ_ALWAYS	(0x08000000U)	/* users always proxyauthz */
+#define	META_BACK_F_PROXYAUTHZ_ANON	(0x10000000U)	/* anonymous always proxyauthz */
+#define	META_BACK_F_PROXYAUTHZ_NOANON	(0x20000000U)	/* anonymous remains anonymous */
+
+#define	META_BACK_ONERR_STOP(mi)	LDAP_BACK_ISSET( (mi), META_BACK_F_ONERR_STOP )
+#define	META_BACK_ONERR_REPORT(mi)	LDAP_BACK_ISSET( (mi), META_BACK_F_ONERR_REPORT )
+#define	META_BACK_ONERR_CONTINUE(mi)	( !LDAP_BACK_ISSET( (mi), META_BACK_F_ONERR_MASK ) )
+
+#define META_BACK_DEFER_ROOTDN_BIND(mi)	LDAP_BACK_ISSET( (mi), META_BACK_F_DEFER_ROOTDN_BIND )
+#define META_BACK_PROXYAUTHZ_ALWAYS(mi)	LDAP_BACK_ISSET( (mi), META_BACK_F_PROXYAUTHZ_ALWAYS )
+#define META_BACK_PROXYAUTHZ_ANON(mi)	LDAP_BACK_ISSET( (mi), META_BACK_F_PROXYAUTHZ_ANON )
+#define META_BACK_PROXYAUTHZ_NOANON(mi)	LDAP_BACK_ISSET( (mi), META_BACK_F_PROXYAUTHZ_NOANON )
+
+#define META_BACK_QUARANTINE(mi)	LDAP_BACK_ISSET( (mi), LDAP_BACK_F_QUARANTINE )
+
+	time_t			mi_idle_timeout;
+	struct re_s *mi_task;
+
+	a_metacommon_t	mi_mc;
+	ldap_extra_t	*mi_ldap_extra;
+
+	int                    mi_max_timeout_ops;
+	int                    mi_max_pending_ops;
+	int                    mi_max_target_conns;
+	/* mutex for access to the connection structures */
+	ldap_pvt_thread_mutex_t	mi_mc_mutex;
+	int                    mi_num_conns;
+	int                    mi_next_conn;
+	a_metaconn_t          *mi_conns;
+
+	struct berval		mi_suffix;
+} a_metainfo_t;
+
+typedef enum meta_op_type {
+	META_OP_ALLOW_MULTIPLE = 0,
+	META_OP_REQUIRE_SINGLE,
+	META_OP_REQUIRE_ALL
+} meta_op_type;
+
+/* Whatever context asyncmeta_dn_massage needs... */
+typedef struct a_dncookie {
+	Operation		*op;
+	struct a_metatarget_t	*target;
+	void	*memctx;
+	int	to_from;
+} a_dncookie;
+
+
+#define MASSAGE_REQ	0
+#define MASSAGE_REP	1
+
+extern void
+asyncmeta_dn_massage(a_dncookie *dc, struct berval *dn,
+	struct berval *res);
+
+extern void
+asyncmeta_filter_map_rewrite(
+	a_dncookie	*dc,
+	Filter		*f,
+	struct berval	*fstr );
+
+extern void
+asyncmeta_back_referral_result_rewrite(
+	a_dncookie	*dc,
+	BerVarray	a_vals );
+
+extern a_metaconn_t *
+asyncmeta_getconn(
+	Operation		*op,
+	SlapReply		*rs,
+	SlapReply               *candidates,
+	int			*candidate,
+	ldap_back_send_t	sendok,
+	int                     alloc_new);
+
+
+extern int
+asyncmeta_init_one_conn(
+	Operation		*op,
+	SlapReply		*rs,
+	a_metaconn_t		*mc,
+	int			candidate,
+	int			ispriv,
+	ldap_back_send_t	sendok,
+	int			dolock );
+
+extern void
+asyncmeta_quarantine(
+	Operation		*op,
+	a_metainfo_t            *mi,
+	SlapReply		*rs,
+	int			candidate );
+
+extern int
+asyncmeta_proxy_authz_cred(
+	a_metaconn_t		*mc,
+	int			candidate,
+	Operation		*op,
+	SlapReply		*rs,
+	ldap_back_send_t	sendok,
+	struct berval		*binddn,
+	struct berval		*bindcred,
+	int			*method );
+
+extern int
+asyncmeta_controls_add(
+	Operation	*op,
+	SlapReply	*rs,
+	a_metaconn_t	*mc,
+	int		candidate,
+	int             isroot,
+	LDAPControl	***pctrls );
+
+extern int
+asyncmeta_LTX_init_module(
+	int			argc,
+	char			*argv[] );
+
+/*
+ * Candidate stuff
+ */
+extern int
+asyncmeta_is_candidate(
+	a_metatarget_t		*mt,
+	struct berval		*ndn,
+	int			scope );
+
+extern int
+asyncmeta_select_unique_candidate(
+	a_metainfo_t		*mi,
+	struct berval		*ndn );
+
+extern int
+asyncmeta_clear_unused_candidates(
+	Operation		*op,
+	int			candidate,
+	a_metaconn_t            *mc,
+	SlapReply	*candidates);
+
+/*
+ * Dn cache stuff (experimental)
+ */
+extern int
+asyncmeta_dncache_cmp(
+	const void		*c1,
+	const void		*c2 );
+
+extern int
+asyncmeta_dncache_dup(
+	void			*c1,
+	void			*c2 );
+
+#define META_TARGET_NONE	(-1)
+#define META_TARGET_MULTIPLE	(-2)
+extern int
+asyncmeta_dncache_get_target(
+	a_metadncache_t		*cache,
+	struct berval		*ndn );
+
+extern int
+meta_dncache_update_entry(
+	a_metadncache_t		*cache,
+	struct berval		*ndn,
+	int			target );
+
+extern int
+asyncmeta_dncache_delete_entry(
+	a_metadncache_t		*cache,
+	struct berval		*ndn );
+
+extern void
+asyncmeta_dncache_free( void *entry );
+
+extern int
+asyncmeta_subtree_destroy( a_metasubtree_t *ms );
+
+extern void
+asyncmeta_filter_destroy( metafilter_t *mf );
+
+extern int
+asyncmeta_target_finish( a_metainfo_t *mi, a_metatarget_t *mt,
+	const char *log, char *msg, size_t msize
+);
+
+
+extern LDAP_REBIND_PROC		asyncmeta_back_default_rebind;
+extern LDAP_URLLIST_PROC	asyncmeta_back_default_urllist;
+
+/* IGNORE means that target does not (no longer) participate
+ * in the search;
+ * NOTREADY means the search on that target has not been initialized yet
+ */
+#define	META_MSGID_IGNORE	(-1)
+#define	META_MSGID_NEED_BIND	(-2)
+#define	META_MSGID_CONNECTING	(-3)
+#define META_MSGID_UNDEFINED    (-4)
+#define META_MSGID_GOT_BIND     (-5)
+
+typedef enum meta_search_candidate_t {
+	META_SEARCH_UNDEFINED = -2,
+	META_SEARCH_ERR = -1,
+	META_SEARCH_NOT_CANDIDATE,
+	META_SEARCH_CANDIDATE,
+	META_SEARCH_BINDING,
+	META_SEARCH_NEED_BIND,
+	META_SEARCH_CONNECTING
+} meta_search_candidate_t;
+
+Operation* asyncmeta_copy_op(Operation *op);
+void asyncmeta_clear_bm_context(bm_context_t *bc);
+
+int asyncmeta_add_message_queue(a_metaconn_t *mc, bm_context_t *bc);
+void asyncmeta_drop_bc(a_metaconn_t *mc, bm_context_t *bc);
+void asyncmeta_drop_bc_from_fconn(bm_context_t *bc);
+
+bm_context_t *
+asyncmeta_find_message(ber_int_t msgid, a_metaconn_t *mc, int candidate);
+
+void* asyncmeta_op_handle_result(void *ctx, void *arg);
+int asyncmeta_back_cleanup( Operation *op, SlapReply *rs, bm_context_t *bm );
+
+int
+asyncmeta_clear_one_msc(
+	Operation	*op,
+	a_metaconn_t	*msc,
+	int		candidate,
+	int             unbind,
+	const char *          caller);
+
+a_metaconn_t *
+asyncmeta_get_next_mc( a_metainfo_t *mi );
+
+void* asyncmeta_timeout_loop(void *ctx, void *arg);
+
+int
+asyncmeta_start_timeout_loop(a_metatarget_t *mt, a_metainfo_t *mi);
+
+void asyncmeta_set_msc_time(a_metasingleconn_t *msc);
+
+int asyncmeta_back_cancel(
+	a_metaconn_t	*mc,
+	Operation		*op,
+	ber_int_t		msgid,
+	int				candidate );
+
+void
+asyncmeta_send_result(bm_context_t* bc, int error, char *text);
+
+int asyncmeta_new_bm_context(Operation *op,
+			     SlapReply *rs,
+			     bm_context_t **new_bc,
+			     int ntargets,
+			     a_metainfo_t       *mi);
+
+int asyncmeta_start_listeners(a_metaconn_t *mc, SlapReply *candidates,  bm_context_t *bc);
+int asyncmeta_start_one_listener(a_metaconn_t *mc, SlapReply *candidates,  bm_context_t *bc, int candidate);
+
+meta_search_candidate_t
+asyncmeta_back_search_start(
+	Operation             *op,
+	SlapReply             *rs,
+	a_metaconn_t          *mc,
+	bm_context_t          *bc,
+	int                   candidate,
+	struct berval	      *prcookie,
+	ber_int_t	      prsize,
+	int do_lock);
+
+meta_search_candidate_t
+asyncmeta_dobind_init(
+	Operation            *op,
+	SlapReply            *rs,
+	bm_context_t         *bc,
+	a_metaconn_t         *mc,
+	int                  candidate);
+
+meta_search_candidate_t
+asyncmeta_dobind_init_with_retry(
+	Operation            *op,
+	SlapReply            *rs,
+	bm_context_t         *bc,
+	a_metaconn_t         *mc,
+	int                  candidate);
+
+meta_search_candidate_t
+asyncmeta_back_add_start(Operation *op,
+			 SlapReply *rs,
+			 a_metaconn_t *mc,
+			 bm_context_t *bc,
+			 int candidate,
+			 int do_lock);
+meta_search_candidate_t
+asyncmeta_back_modify_start(Operation *op,
+			    SlapReply *rs,
+			    a_metaconn_t *mc,
+			    bm_context_t *bc,
+			    int candidate,
+			    int do_lock);
+
+meta_search_candidate_t
+asyncmeta_back_modrdn_start(Operation *op,
+			    SlapReply *rs,
+			    a_metaconn_t *mc,
+			    bm_context_t *bc,
+			    int candidate,
+			    int do_lock);
+meta_search_candidate_t
+asyncmeta_back_delete_start(Operation *op,
+			    SlapReply *rs,
+			    a_metaconn_t *mc,
+			    bm_context_t *bc,
+			    int candidate,
+			    int do_lock);
+
+meta_search_candidate_t
+asyncmeta_back_compare_start(Operation *op,
+			     SlapReply *rs,
+			     a_metaconn_t *mc,
+			     bm_context_t *bc,
+			     int candidate,
+			     int do_lock);
+
+bm_context_t *
+asyncmeta_bc_in_queue(a_metaconn_t *mc,
+		      bm_context_t *bc);
+
+int
+asyncmeta_error_cleanup(Operation *op,
+			SlapReply *rs,
+			bm_context_t *bc,
+			a_metaconn_t *mc,
+			int candidate);
+
+int
+asyncmeta_reset_msc(Operation	*op,
+		    a_metaconn_t	*mc,
+		    int		candidate,
+		    int             unbind,
+		    const char *caller);
+
+
+void
+asyncmeta_back_conn_free(
+	            void 		*v_mc );
+
+void asyncmeta_log_msc(a_metasingleconn_t *msc);
+void asyncmeta_log_conns(a_metainfo_t *mi);
+
+void asyncmeta_get_timestamp(char *buf);
+
+int
+asyncmeta_dncache_update_entry(a_metadncache_t	*cache,
+			       struct berval	*ndn,
+			       int 		target );
+
+void
+asyncmeta_dnattr_result_rewrite(a_dncookie		*dc,
+				BerVarray		a_vals);
+
+void
+asyncmeta_referral_result_rewrite(a_dncookie		*dc,
+				  BerVarray		a_vals);
+
+meta_search_candidate_t
+asyncmeta_send_all_pending_ops(a_metaconn_t *mc,
+			       int          candidate,
+			       void         *ctx,
+			       int          dolock);
+meta_search_candidate_t
+asyncmeta_return_bind_errors(a_metaconn_t *mc,
+			     int          candidate,
+			     SlapReply    *bind_result,
+			     void         *ctx,
+			     int          dolock);
+
+/* The the maximum time in seconds after a result has been received on a connection,
+ * after which it can be reset if a sender error occurs. Should this be configurable? */
+#define META_BACK_RESULT_INTERVAL (2)
+
+extern int asyncmeta_debug;
+
+LDAP_END_DECL
+
+#endif /* SLAPD_ASYNCMETA_H */