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openldap/servers/slapd/back-meta/conn.c
Pierangelo Masarati 754a059951 fix concurrency issues
2005-07-04 22:41:54 +00:00

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/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1999-2005 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"
/*
* Set PRINT_CONNTREE larger than 0 to dump the connection tree (debug only)
*/
#define PRINT_CONNTREE 0
/*
* 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;
return SLAP_PTRCMP( mc1->mc_conn, mc2->mc_conn );
}
/*
* meta_back_conn_dup
*
* returns -1 in case a duplicate struct metaconn has been inserted;
* used by avl stuff
*/
int
meta_back_conn_dup(
void *c1,
void *c2 )
{
metaconn_t *mc1 = ( metaconn_t * )c1;
metaconn_t *mc2 = ( metaconn_t * )c2;
return( ( mc1->mc_conn == mc2->mc_conn ) ? -1 : 0 );
}
/*
* Debug stuff (got it from libavl)
*/
#if PRINT_CONNTREE > 0
static void
ravl_print( Avlnode *root, int depth )
{
int i;
if ( root == 0 ) {
return;
}
ravl_print( root->avl_right, depth + 1 );
for ( i = 0; i < depth; i++ ) {
printf( " " );
}
printf( "c(%d) %d\n", ( ( metaconn_t * )root->avl_data )->mc_conn->c_connid, root->avl_bf );
ravl_print( root->avl_left, depth + 1 );
}
static void
myprint( Avlnode *root )
{
printf( "********\n" );
if ( root == 0 ) {
printf( "\tNULL\n" );
} else {
ravl_print( root, 0 );
}
printf( "********\n" );
}
#endif /* 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 i, ntargets = mi->mi_ntargets;
assert( ntargets > 0 );
/* malloc all in one */
mc = ( metaconn_t * )ch_malloc( sizeof( metaconn_t )
+ sizeof( metasingleconn_t ) * ntargets );
if ( mc == NULL ) {
return NULL;
}
for ( i = 0; i < ntargets; i++ ) {
mc->mc_conns[ i ].msc_ld = NULL;
BER_BVZERO( &mc->mc_conns[ i ].msc_bound_ndn );
BER_BVZERO( &mc->mc_conns[ i ].msc_cred );
mc->mc_conns[ i ].msc_bound = META_UNBOUND;
mc->mc_conns[ i ].msc_info = mi;
}
mc->mc_auth_target = META_BOUND_NONE;
ldap_pvt_thread_mutex_init( &mc->mc_mutex );
mc->mc_refcnt = 1;
return mc;
}
/*
* meta_back_conn_free
*
* clears a metaconn
*/
void
meta_back_conn_free(
metaconn_t *mc )
{
assert( mc != NULL );
assert( mc->mc_refcnt == 0 );
ldap_pvt_thread_mutex_destroy( &mc->mc_mutex );
free( mc );
}
static void
meta_back_freeconn(
Operation *op,
metaconn_t *mc )
{
metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
assert( mc != NULL );
retry_lock:;
switch ( ldap_pvt_thread_mutex_trylock( &mi->mi_conn_mutex ) ) {
case LDAP_PVT_THREAD_EBUSY:
default:
ldap_pvt_thread_yield();
goto retry_lock;
case 0:
break;
}
if ( --mc->mc_refcnt == 0 ) {
meta_back_conn_free( mc );
}
ldap_pvt_thread_mutex_unlock( &mi->mi_conn_mutex );
}
/*
* meta_back_init_one_conn
*
* Initializes one connection
*/
int
meta_back_init_one_conn(
Operation *op,
SlapReply *rs,
metatarget_t *mt,
metasingleconn_t *msc,
ldap_back_send_t sendok )
{
metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
int vers;
dncookie dc;
/*
* Already init'ed
*/
if ( msc->msc_ld != NULL ) {
rs->sr_err = LDAP_SUCCESS;
goto error_return;
}
/*
* Attempts to initialize the connection to the target ds
*/
rs->sr_err = ldap_initialize( &msc->msc_ld, mt->mt_uri );
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.
*/
vers = op->o_conn->c_protocol;
ldap_set_option( msc->msc_ld, LDAP_OPT_PROTOCOL_VERSION, &vers );
/* automatically chase referrals ("chase-referrals"/"dont-chase-referrals" statement) */
if ( LDAP_BACK_CHASE_REFERRALS( mi ) ) {
ldap_set_option( msc->msc_ld, LDAP_OPT_REFERRALS, LDAP_OPT_ON );
}
#ifdef HAVE_TLS
/* start TLS ("start-tls"/"try-start-tls" statements) */
if ( ( LDAP_BACK_USE_TLS( mi ) || ( op->o_conn->c_is_tls && LDAP_BACK_PROPAGATE_TLS( mi ) ) )
&& !ldap_is_ldaps_url( mt->mt_uri ) )
{
#ifdef SLAP_STARTTLS_ASYNCHRONOUS
/*
* use asynchronous StartTLS
* in case, chase referral (not implemented 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 = { 0, 0 };
retry:;
rc = ldap_result( msc->msc_ld, msgid, LDAP_MSG_ALL, &tv, &res );
if ( rc < 0 ) {
rs->sr_err = LDAP_OTHER;
} else if ( rc == 0 ) {
if ( nretries != 0 ) {
if ( nretries > 0 ) {
nretries--;
}
tv.tv_sec = 0;
tv.tv_usec = 100000;
goto retry;
}
rs->sr_err = LDAP_OTHER;
} else if ( rc == LDAP_RES_EXTENDED ) {
struct berval *data = NULL;
rs->sr_err = ldap_parse_extended_result( msc->msc_ld, res,
NULL, &data, 0 );
if ( rs->sr_err == LDAP_SUCCESS ) {
rs->sr_err = ldap_result2error( msc->msc_ld, res, 1 );
res = NULL;
/* 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 ) {
rs->sr_err = LDAP_OTHER;
rs->sr_text = "unwilling to chase referral returned by Start TLS exop";
}
if ( data ) {
if ( data->bv_val ) {
ber_memfree( data->bv_val );
}
ber_memfree( data );
}
}
} else {
rs->sr_err = LDAP_OTHER;
}
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 && LDAP_BACK_TLS_CRITICAL( mi ) ) )
{
ldap_unbind_ext_s( msc->msc_ld, NULL, NULL );
goto error_return;
}
}
#endif /* HAVE_TLS */
/*
* Set the network timeout if set
*/
if ( mi->mi_network_timeout != 0 ) {
struct timeval network_timeout;
network_timeout.tv_usec = 0;
network_timeout.tv_sec = mi->mi_network_timeout;
ldap_set_option( msc->msc_ld, LDAP_OPT_NETWORK_TIMEOUT,
(void *)&network_timeout );
}
/*
* Sets a cookie for the rewrite session
*/
( void )rewrite_session_init( mt->mt_rwmap.rwm_rw, op->o_conn );
/*
* If the connection DN is not null, an attempt to rewrite it is made
*/
if ( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
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 ) )
{
goto error_return;
}
/* copy the DN idf 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_str2bv( "", 0, 1, &msc->msc_bound_ndn );
}
msc->msc_bound = META_UNBOUND;
error_return:;
if ( rs->sr_err != LDAP_SUCCESS ) {
rs->sr_err = slap_map_api2result( rs );
if ( sendok & LDAP_BACK_SENDERR ) {
send_ldap_result( op, rs );
rs->sr_text = NULL;
}
}
return rs->sr_err;
}
/*
* meta_back_retry
*
* Retries one connection
*/
int
meta_back_retry(
Operation *op,
SlapReply *rs,
metaconn_t *mc,
int candidate,
ldap_back_send_t sendok )
{
metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
metatarget_t *mt = &mi->mi_targets[ candidate ];
int rc = LDAP_UNAVAILABLE;
metasingleconn_t *msc = &mc->mc_conns[ candidate ];
retry_lock:;
switch ( ldap_pvt_thread_mutex_trylock( &mi->mi_conn_mutex ) ) {
case LDAP_PVT_THREAD_EBUSY:
default:
ldap_pvt_thread_yield();
goto retry_lock;
case 0:
break;
}
assert( mc->mc_refcnt > 0 );
if ( mc->mc_refcnt == 1 ) {
ldap_pvt_thread_mutex_lock( &mc->mc_mutex );
ldap_unbind_ext_s( msc->msc_ld, NULL, NULL );
msc->msc_ld = NULL;
msc->msc_bound = 0;
/* mc here must be the regular mc, reset and ready for init */
rc = meta_back_init_one_conn( op, rs, mt, msc, sendok );
if ( rc == LDAP_SUCCESS ) {
rc = meta_back_single_dobind( op, rs, mc, candidate,
sendok, mt->mt_nretries, 0 );
}
ldap_pvt_thread_mutex_unlock( &mc->mc_mutex );
}
ldap_pvt_thread_mutex_unlock( &mi->mi_conn_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:
((int *)op->o_callback->sc_private)[0] = (int)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;
int 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 ) {
Filter f = { 0 };
Operation op2 = *op;
SlapReply rs2 = { 0 };
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;
f.f_choice = LDAP_FILTER_PRESENT;
f.f_desc = slap_schema.si_ad_objectClass;
op2.ors_filter = &f;
BER_BVSTR( &op2.ors_filterstr, "(objectClass=*)" );
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 ].mt_nsuffix,
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 = "cannot select unique candidate target";
}
break;
}
}
return candidate;
}
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;
SlapReply *rs;
if ( op->o_threadctx ) {
void *data = NULL;
ldap_pvt_thread_pool_getkey( op->o_threadctx,
meta_back_candidates_keyfree, &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_keyfree, data,
meta_back_candidates_keyfree );
} 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_ntargets = mi->mi_ntargets;
mc->mc_candidates = ch_realloc( mc->mc_candidates,
sizeof( SlapReply ) * mc->mc_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;
int parent = 0,
newparent = 0;
struct berval ndn = op->o_req_ndn,
pndn;
SlapReply *candidates = meta_back_candidates_get( op );
/* Searches for a metaconn in the avl tree */
mc_curr.mc_conn = op->o_conn;
retry_lock:;
switch ( ldap_pvt_thread_mutex_trylock( &mi->mi_conn_mutex ) ) {
case LDAP_PVT_THREAD_EBUSY:
default:
ldap_pvt_thread_yield();
goto retry_lock;
case 0:
break;
}
mc = (metaconn_t *)avl_find( mi->mi_conntree,
(caddr_t)&mc_curr, meta_back_conn_cmp );
if ( mc ) {
mc->mc_refcnt++;
}
ldap_pvt_thread_mutex_unlock( &mi->mi_conn_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 */
parent = 1;
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 ) {
newparent = 1;
}
break;
case LDAP_REQ_BIND:
/* if bound as rootdn, the backend must bind to all targets
* with the administrative identity */
if ( op->orb_method == LDAP_AUTH_SIMPLE && be_isroot_pw( op ) ) {
op_type = META_OP_REQUIRE_ALL;
}
break;
case LDAP_REQ_DELETE:
case LDAP_REQ_MODIFY:
/* just a unique candidate */
break;
case LDAP_REQ_COMPARE:
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 ) {
mc = metaconn_alloc( op );
mc->mc_conn = op->o_conn;
new_conn = 1;
}
for ( i = 0; i < mi->mi_ntargets; i++ ) {
/*
* The target is activated; if needed, it is
* also init'd
*/
int lerr = meta_back_init_one_conn( op, rs, &mi->mi_targets[ i ],
&mc->mc_conns[ i ], sendok );
if ( lerr == LDAP_SUCCESS ) {
candidates[ i ].sr_tag = META_CANDIDATE;
ncandidates++;
} else {
/*
* FIXME: in case one target cannot
* be init'd, should the other ones
* be tried?
*/
candidates[ i ].sr_tag = META_NOT_CANDIDATE;
err = lerr;
continue;
}
}
if ( ncandidates == 0 ) {
if ( new_conn ) {
meta_back_freeconn( op, mc );
} else {
meta_back_release_conn( op, 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_text = NULL;
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 ) {
int j;
for ( j = 0; j < mi->mi_ntargets; j++ ) {
candidates[ j ].sr_tag = META_NOT_CANDIDATE;
}
/*
* 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 && parent ) {
i = meta_back_get_candidate( op, rs, &pndn );
}
if ( rs->sr_err != LDAP_SUCCESS ) {
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_text = NULL;
rs->sr_matched = NULL;
}
return NULL;
}
}
if ( newparent && meta_back_get_candidate( op, rs, op->orr_nnewSup ) != i )
{
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 );
rs->sr_text = NULL;
}
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() */
mc_curr.mc_conn = op->o_conn;
retry_lock2:;
switch ( ldap_pvt_thread_mutex_trylock( &mi->mi_conn_mutex ) ) {
case LDAP_PVT_THREAD_EBUSY:
default:
ldap_pvt_thread_yield();
goto retry_lock2;
case 0:
break;
}
mc = (metaconn_t *)avl_find( mi->mi_conntree,
(caddr_t)&mc_curr, meta_back_conn_cmp );
if ( mc != NULL ) {
mc->mc_refcnt++;
}
ldap_pvt_thread_mutex_unlock( &mi->mi_conn_mutex );
/* Looks like we didn't get a bind. Open a new session... */
if ( mc == NULL ) {
mc = metaconn_alloc( op );
mc->mc_conn = op->o_conn;
new_conn = 1;
}
}
/*
* Clear all other candidates
*/
( void )meta_clear_unused_candidates( op, 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, &mi->mi_targets[ i ],
&mc->mc_conns[ i ], sendok );
if ( err != LDAP_SUCCESS ) {
/*
* FIXME: in case one target cannot
* be init'd, should the other ones
* be tried?
*/
candidates[ i ].sr_tag = META_NOT_CANDIDATE;
if ( new_conn ) {
(void)meta_clear_one_candidate( &mc->mc_conns[ i ] );
meta_back_freeconn( op, mc );
} else {
meta_back_release_conn( op, mc );
}
return NULL;
}
candidates[ i ].sr_tag = META_CANDIDATE;
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 ) {
mc = metaconn_alloc( op );
mc->mc_conn = op->o_conn;
new_conn = 1;
}
for ( i = 0; i < mi->mi_ntargets; i++ ) {
if ( i == cached
|| meta_back_is_candidate( &mi->mi_targets[ i ].mt_nsuffix,
&op->o_req_ndn, LDAP_SCOPE_SUBTREE ) )
{
/*
* The target is activated; if needed, it is
* also init'd
*/
int lerr = meta_back_init_one_conn( op, rs,
&mi->mi_targets[ i ],
&mc->mc_conns[ i ], sendok );
if ( lerr == LDAP_SUCCESS ) {
candidates[ i ].sr_tag = META_CANDIDATE;
ncandidates++;
Debug( LDAP_DEBUG_TRACE, "%s: meta_back_init_one_conn(%d)\n",
op->o_log_prefix, i, 0 );
} else {
/*
* FIXME: in case one target cannot
* be init'd, should the other ones
* be tried?
*/
if ( new_conn ) {
( void )meta_clear_one_candidate( &mc->mc_conns[ i ] );
}
candidates[ i ].sr_tag = META_NOT_CANDIDATE;
err = lerr;
Debug( LDAP_DEBUG_ANY, "%s: meta_back_init_one_conn(%d) failed: %d\n",
op->o_log_prefix, i, lerr );
continue;
}
} else {
if ( new_conn ) {
( void )meta_clear_one_candidate( &mc->mc_conns[ i ] );
}
candidates[ i ].sr_tag = META_NOT_CANDIDATE;
}
}
if ( ncandidates == 0 ) {
if ( new_conn ) {
meta_back_freeconn( op, mc );
} else {
meta_back_release_conn( op, 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_text = NULL;
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;
if ( new_conn ) {
/*
* Inserts the newly created metaconn in the avl tree
*/
retry_lock3:;
switch ( ldap_pvt_thread_mutex_trylock( &mi->mi_conn_mutex ) ) {
case LDAP_PVT_THREAD_EBUSY:
default:
ldap_pvt_thread_yield();
goto retry_lock3;
case 0:
break;
}
err = avl_insert( &mi->mi_conntree, ( caddr_t )mc,
meta_back_conn_cmp, meta_back_conn_dup );
#if PRINT_CONNTREE > 0
myprint( mi->mi_conntree );
#endif /* PRINT_CONNTREE */
ldap_pvt_thread_mutex_unlock( &mi->mi_conn_mutex );
/*
* Err could be -1 in case a duplicate metaconn is inserted
*
* FIXME: what if the same client issues more than one
* asynchronous operations?
*/
if ( err != 0 ) {
Debug( LDAP_DEBUG_ANY,
"%s meta_back_getconn: candidates=%d conn=%ld insert failed\n",
op->o_log_prefix, ncandidates, mc->mc_conn->c_connid );
rs->sr_err = LDAP_OTHER;
rs->sr_text = "Internal server error";
meta_back_freeconn( op, mc );
if ( sendok & LDAP_BACK_SENDERR ) {
send_ldap_result( op, rs );
rs->sr_text = NULL;
}
return NULL;
}
Debug( LDAP_DEBUG_TRACE,
"%s meta_back_getconn: candidates=%d conn=%ld inserted\n",
op->o_log_prefix, ncandidates, mc->mc_conn->c_connid );
} else {
Debug( LDAP_DEBUG_TRACE,
"%s meta_back_getconn: candidates=%d conn=%ld fetched\n",
op->o_log_prefix, ncandidates, mc->mc_conn->c_connid );
}
return mc;
}
void
meta_back_release_conn(
Operation *op,
metaconn_t *mc )
{
metainfo_t *mi = ( metainfo_t * )op->o_bd->be_private;
assert( mc != NULL );
retry_lock:;
switch ( ldap_pvt_thread_mutex_trylock( &mi->mi_conn_mutex ) ) {
case LDAP_PVT_THREAD_EBUSY:
default:
ldap_pvt_thread_yield();
goto retry_lock;
case 0:
break;
}
assert( mc->mc_refcnt > 0 );
mc->mc_refcnt--;
ldap_pvt_thread_mutex_unlock( &mi->mi_conn_mutex );
}
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