diff options
Diffstat (limited to '')
| -rw-r--r-- | servers/lloadd/backend.c | 736 |
1 files changed, 736 insertions, 0 deletions
diff --git a/servers/lloadd/backend.c b/servers/lloadd/backend.c new file mode 100644 index 0000000..ab0e932 --- /dev/null +++ b/servers/lloadd/backend.c @@ -0,0 +1,736 @@ +/* $OpenLDAP$ */ +/* This work is part of OpenLDAP Software <http://www.openldap.org/>. + * + * Copyright 1998-2022 The OpenLDAP Foundation. + * 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>. + */ + +#include "portable.h" + +#include <ac/socket.h> +#include <ac/errno.h> +#include <ac/string.h> +#include <ac/time.h> +#include <ac/unistd.h> + +#include <event2/event.h> +#include <event2/dns.h> + +#include "lutil.h" +#include "lload.h" + +static void +upstream_connect_cb( evutil_socket_t s, short what, void *arg ) +{ + LloadPendingConnection *conn = arg; + LloadBackend *b = conn->backend; + int error = 0, rc = -1; + epoch_t epoch; + + checked_lock( &b->b_mutex ); + Debug( LDAP_DEBUG_CONNS, "upstream_connect_cb: " + "fd=%d connection callback for backend uri='%s'\n", + s, b->b_uri.bv_val ); + + if ( s != conn->fd ) { + /* backend_reset has been here first */ + goto preempted; + } + + epoch = epoch_join(); + + if ( what == EV_WRITE ) { + socklen_t optlen = sizeof(error); + + if ( getsockopt( conn->fd, SOL_SOCKET, SO_ERROR, (void *)&error, + &optlen ) < 0 ) { + goto done; + } + if ( error == EINTR || error == EINPROGRESS || error == EWOULDBLOCK ) { + checked_unlock( &b->b_mutex ); + epoch_leave( epoch ); + return; + } else if ( error ) { + goto done; + } else if ( upstream_init( s, conn->backend ) == NULL ) { + goto done; + } + rc = LDAP_SUCCESS; + } + +done: + epoch_leave( epoch ); + + LDAP_LIST_REMOVE( conn, next ); + if ( rc ) { + evutil_closesocket( conn->fd ); + b->b_opening--; + b->b_failed++; + if ( what & EV_TIMEOUT ) { + Debug( LDAP_DEBUG_ANY, "upstream_connect_cb: " + "fd=%d connection timed out\n", + s ); + } else { + char ebuf[128]; + Debug( LDAP_DEBUG_ANY, "upstream_connect_cb: " + "fd=%d connection set up failed%s%s\n", + s, error ? ": " : "", + error ? sock_errstr( error, ebuf, sizeof(ebuf) ) : "" ); + } + backend_retry( b ); + } +preempted: + checked_unlock( &b->b_mutex ); + + event_free( conn->event ); + ch_free( conn ); +} + +static void +upstream_name_cb( int result, struct evutil_addrinfo *res, void *arg ) +{ + LloadBackend *b = arg; + ber_socket_t s = AC_SOCKET_INVALID; + epoch_t epoch; + int rc; + + if ( result == EVUTIL_EAI_CANCEL ) { + Debug( LDAP_DEBUG_ANY, "upstream_name_cb: " + "cancelled\n" ); + return; + } + + checked_lock( &b->b_mutex ); + /* We were already running when backend_reset tried to cancel us, but were + * already stuck waiting for the mutex, nothing to do and b_opening has + * been decremented as well */ + if ( b->b_dns_req == NULL ) { + checked_unlock( &b->b_mutex ); + return; + } + b->b_dns_req = NULL; + + epoch = epoch_join(); + if ( result || !res ) { + Debug( LDAP_DEBUG_ANY, "upstream_name_cb: " + "name resolution failed for backend '%s': %s\n", + b->b_uri.bv_val, evutil_gai_strerror( result ) ); + goto fail; + } + + /* TODO: if we get failures, try the other addrinfos */ + if ( (s = socket( res->ai_family, SOCK_STREAM, 0 )) == + AC_SOCKET_INVALID ) { + goto fail; + } + + if ( ber_pvt_socket_set_nonblock( s, 1 ) ) { + goto fail; + } + +#if defined(SO_KEEPALIVE) || defined(TCP_NODELAY) + if ( b->b_proto == LDAP_PROTO_TCP ) { + int dummy = 1; +#ifdef SO_KEEPALIVE + if ( setsockopt( s, SOL_SOCKET, SO_KEEPALIVE, (char *)&dummy, + sizeof(dummy) ) == AC_SOCKET_ERROR ) { + Debug( LDAP_DEBUG_TRACE, "upstream_name_cb: " + "setsockopt(%d, SO_KEEPALIVE) failed (ignored).\n", + s ); + } + if ( bindconf.sb_keepalive.sk_idle > 0 ) { +#ifdef TCP_KEEPIDLE + if ( setsockopt( s, IPPROTO_TCP, TCP_KEEPIDLE, + (void *)&bindconf.sb_keepalive.sk_idle, + sizeof(bindconf.sb_keepalive.sk_idle) ) == + AC_SOCKET_ERROR ) { + Debug( LDAP_DEBUG_TRACE, "upstream_name_cb: " + "setsockopt(%d, TCP_KEEPIDLE) failed (ignored).\n", + s ); + } +#else + Debug( LDAP_DEBUG_TRACE, "upstream_name_cb: " + "sockopt TCP_KEEPIDLE not supported on this system.\n" ); +#endif /* TCP_KEEPIDLE */ + } + if ( bindconf.sb_keepalive.sk_probes > 0 ) { +#ifdef TCP_KEEPCNT + if ( setsockopt( s, IPPROTO_TCP, TCP_KEEPCNT, + (void *)&bindconf.sb_keepalive.sk_probes, + sizeof(bindconf.sb_keepalive.sk_probes) ) == + AC_SOCKET_ERROR ) { + Debug( LDAP_DEBUG_TRACE, "upstream_name_cb: " + "setsockopt(%d, TCP_KEEPCNT) failed (ignored).\n", + s ); + } +#else + Debug( LDAP_DEBUG_TRACE, "upstream_name_cb: " + "sockopt TCP_KEEPCNT not supported on this system.\n" ); +#endif /* TCP_KEEPCNT */ + } + if ( bindconf.sb_keepalive.sk_interval > 0 ) { +#ifdef TCP_KEEPINTVL + if ( setsockopt( s, IPPROTO_TCP, TCP_KEEPINTVL, + (void *)&bindconf.sb_keepalive.sk_interval, + sizeof(bindconf.sb_keepalive.sk_interval) ) == + AC_SOCKET_ERROR ) { + Debug( LDAP_DEBUG_TRACE, "upstream_name_cb: " + "setsockopt(%d, TCP_KEEPINTVL) failed (ignored).\n", + s ); + } +#else + Debug( LDAP_DEBUG_TRACE, "upstream_name_cb: " + "sockopt TCP_KEEPINTVL not supported on this system.\n" ); +#endif /* TCP_KEEPINTVL */ + } +#endif /* SO_KEEPALIVE */ + if ( bindconf.sb_tcp_user_timeout > 0 ) { +#ifdef TCP_USER_TIMEOUT + if ( setsockopt( s, IPPROTO_TCP, TCP_USER_TIMEOUT, + (void *)&bindconf.sb_tcp_user_timeout, + sizeof(bindconf.sb_tcp_user_timeout) ) == + AC_SOCKET_ERROR ) { + Debug( LDAP_DEBUG_TRACE, "upstream_name_cb: " + "setsockopt(%d, TCP_USER_TIMEOUT) failed (ignored).\n", + s ); + } +#else + Debug( LDAP_DEBUG_TRACE, "upstream_name_cb: " + "sockopt TCP_USER_TIMEOUT not supported on this " + "system.\n" ); +#endif /* TCP_USER_TIMEOUT */ + } +#ifdef TCP_NODELAY + if ( setsockopt( s, IPPROTO_TCP, TCP_NODELAY, (char *)&dummy, + sizeof(dummy) ) == AC_SOCKET_ERROR ) { + Debug( LDAP_DEBUG_TRACE, "upstream_name_cb: " + "setsockopt(%d, TCP_NODELAY) failed (ignored).\n", + s ); + } +#endif /* TCP_NODELAY */ + } +#endif /* SO_KEEPALIVE || TCP_NODELAY */ + + if ( res->ai_family == PF_INET ) { + struct sockaddr_in *ai = (struct sockaddr_in *)res->ai_addr; + ai->sin_port = htons( b->b_port ); + rc = connect( s, (struct sockaddr *)ai, res->ai_addrlen ); + } else { + struct sockaddr_in6 *ai = (struct sockaddr_in6 *)res->ai_addr; + ai->sin6_port = htons( b->b_port ); + rc = connect( s, (struct sockaddr *)ai, res->ai_addrlen ); + } + /* Asynchronous connect */ + if ( rc ) { + LloadPendingConnection *conn; + + if ( errno != EINPROGRESS && errno != EWOULDBLOCK ) { + Debug( LDAP_DEBUG_ANY, "upstream_name_cb: " + "failed to connect to server '%s'\n", + b->b_uri.bv_val ); + evutil_closesocket( s ); + goto fail; + } + + conn = ch_calloc( 1, sizeof(LloadPendingConnection) ); + LDAP_LIST_ENTRY_INIT( conn, next ); + conn->backend = b; + conn->fd = s; + + conn->event = event_new( lload_get_base( s ), s, EV_WRITE|EV_PERSIST, + upstream_connect_cb, conn ); + if ( !conn->event ) { + Debug( LDAP_DEBUG_ANY, "upstream_name_cb: " + "failed to acquire an event to finish upstream " + "connection setup.\n" ); + ch_free( conn ); + evutil_closesocket( s ); + goto fail; + } + + event_add( conn->event, lload_timeout_net ); + LDAP_LIST_INSERT_HEAD( &b->b_connecting, conn, next ); + Debug( LDAP_DEBUG_CONNS, "upstream_name_cb: " + "connection to backend uri=%s in progress\n", + b->b_uri.bv_val ); + } else if ( upstream_init( s, b ) == NULL ) { + goto fail; + } + + checked_unlock( &b->b_mutex ); + evutil_freeaddrinfo( res ); + epoch_leave( epoch ); + return; + +fail: + if ( s != AC_SOCKET_INVALID ) { + evutil_closesocket( s ); + } + b->b_opening--; + b->b_failed++; + backend_retry( b ); + checked_unlock( &b->b_mutex ); + if ( res ) { + evutil_freeaddrinfo( res ); + } + epoch_leave( epoch ); +} + +LloadConnection * +backend_select( LloadOperation *op, int *res ) +{ + LloadBackend *b, *first, *next; + + checked_lock( &backend_mutex ); + first = b = current_backend; + checked_unlock( &backend_mutex ); + + *res = LDAP_UNAVAILABLE; + + if ( !first ) { + return NULL; + } + + /* TODO: Two runs, one with trylock, then one actually locked if we don't + * find anything? */ + do { + lload_c_head *head; + LloadConnection *c; + + checked_lock( &b->b_mutex ); + next = LDAP_CIRCLEQ_LOOP_NEXT( &backend, b, b_next ); + + if ( b->b_max_pending && b->b_n_ops_executing >= b->b_max_pending ) { + Debug( LDAP_DEBUG_CONNS, "backend_select: " + "backend %s too busy\n", + b->b_uri.bv_val ); + checked_unlock( &b->b_mutex ); + b = next; + *res = LDAP_BUSY; + continue; + } + + if ( op->o_tag == LDAP_REQ_BIND +#ifdef LDAP_API_FEATURE_VERIFY_CREDENTIALS + && !(lload_features & LLOAD_FEATURE_VC) +#endif /* LDAP_API_FEATURE_VERIFY_CREDENTIALS */ + ) { + head = &b->b_bindconns; + } else { + head = &b->b_conns; + } + if ( !LDAP_CIRCLEQ_EMPTY( head ) ) { + *res = LDAP_BUSY; + } + + LDAP_CIRCLEQ_FOREACH ( c, head, c_next ) { + checked_lock( &c->c_io_mutex ); + CONNECTION_LOCK(c); + if ( c->c_state == LLOAD_C_READY && !c->c_pendingber && + ( b->b_max_conn_pending == 0 || + c->c_n_ops_executing < b->b_max_conn_pending ) ) { + Debug( LDAP_DEBUG_CONNS, "backend_select: " + "selected connection connid=%lu for client " + "connid=%lu msgid=%d\n", + c->c_connid, op->o_client_connid, op->o_client_msgid ); + + /* c_state is DYING if we're about to be unlinked */ + assert( IS_ALIVE( c, c_live ) ); + + /* + * Round-robin step: + * Rotate the queue to put this connection at the end, same for + * the backend. + */ + LDAP_CIRCLEQ_MAKE_TAIL( head, c, c_next ); + + checked_lock( &backend_mutex ); + current_backend = next; + checked_unlock( &backend_mutex ); + + b->b_n_ops_executing++; + if ( op->o_tag == LDAP_REQ_BIND ) { + b->b_counters[LLOAD_STATS_OPS_BIND].lc_ops_received++; + } else { + b->b_counters[LLOAD_STATS_OPS_OTHER].lc_ops_received++; + } + c->c_n_ops_executing++; + c->c_counters.lc_ops_received++; + + checked_unlock( &b->b_mutex ); + *res = LDAP_SUCCESS; + CONNECTION_ASSERT_LOCKED(c); + assert_locked( &c->c_io_mutex ); + return c; + } + CONNECTION_UNLOCK(c); + checked_unlock( &c->c_io_mutex ); + } + checked_unlock( &b->b_mutex ); + + b = next; + } while ( b != first ); + + return NULL; +} + +/* + * Will schedule a connection attempt if there is a need for it. Need exclusive + * access to backend, its b_mutex is not touched here, though. + */ +void +backend_retry( LloadBackend *b ) +{ + int requested; + + if ( slapd_shutdown ) { + Debug( LDAP_DEBUG_CONNS, "backend_retry: " + "shutting down\n" ); + return; + } + assert_locked( &b->b_mutex ); + + requested = b->b_numconns; +#ifdef LDAP_API_FEATURE_VERIFY_CREDENTIALS + if ( !(lload_features & LLOAD_FEATURE_VC) ) +#endif /* LDAP_API_FEATURE_VERIFY_CREDENTIALS */ + { + requested += b->b_numbindconns; + } + + if ( b->b_active + b->b_bindavail + b->b_opening >= requested ) { + Debug( LDAP_DEBUG_CONNS, "backend_retry: " + "no more connections needed for this backend\n" ); + assert_locked( &b->b_mutex ); + return; + } + + if ( b->b_opening > 0 ) { + Debug( LDAP_DEBUG_CONNS, "backend_retry: " + "retry in progress already\n" ); + assert( b->b_opening == 1 ); + assert_locked( &b->b_mutex ); + return; + } + + /* We incremented b_opening when we activated the event, so it can't be + * pending */ + assert( !event_pending( b->b_retry_event, EV_TIMEOUT, NULL ) ); + b->b_opening++; + + if ( b->b_failed > 0 ) { + Debug( LDAP_DEBUG_CONNS, "backend_retry: " + "scheduling a retry in %d ms\n", + b->b_retry_timeout ); + event_add( b->b_retry_event, &b->b_retry_tv ); + assert_locked( &b->b_mutex ); + return; + } + + Debug( LDAP_DEBUG_CONNS, "backend_retry: " + "scheduling re-connection straight away\n" ); + + if ( ldap_pvt_thread_pool_submit2( + &connection_pool, backend_connect_task, b, &b->b_cookie ) ) { + Debug( LDAP_DEBUG_ANY, "backend_retry: " + "failed to submit retry task, scheduling a retry instead\n" ); + /* The current implementation of ldap_pvt_thread_pool_submit2 can fail + * and still set (an invalid) cookie */ + b->b_cookie = NULL; + b->b_failed++; + event_add( b->b_retry_event, &b->b_retry_tv ); + } + assert_locked( &b->b_mutex ); +} + +void +backend_connect( evutil_socket_t s, short what, void *arg ) +{ + struct evutil_addrinfo hints = {}; + LloadBackend *b = arg; + struct evdns_getaddrinfo_request *request, *placeholder; + char *hostname; + epoch_t epoch; + + checked_lock( &b->b_mutex ); + assert( b->b_dns_req == NULL ); + + if ( b->b_cookie ) { + b->b_cookie = NULL; + } + + if ( slapd_shutdown ) { + Debug( LDAP_DEBUG_CONNS, "backend_connect: " + "doing nothing, shutdown in progress\n" ); + b->b_opening--; + checked_unlock( &b->b_mutex ); + return; + } + + epoch = epoch_join(); + + Debug( LDAP_DEBUG_CONNS, "backend_connect: " + "%sattempting connection to %s\n", + (what & EV_TIMEOUT) ? "retry timeout finished, " : "", + b->b_host ); + +#ifdef LDAP_PF_LOCAL + if ( b->b_proto == LDAP_PROTO_IPC ) { + struct sockaddr_un addr; + ber_socket_t s = socket( PF_LOCAL, SOCK_STREAM, 0 ); + int rc; + + if ( s == AC_SOCKET_INVALID ) { + goto fail; + } + + rc = ber_pvt_socket_set_nonblock( s, 1 ); + if ( rc ) { + evutil_closesocket( s ); + goto fail; + } + + if ( strlen( b->b_host ) > ( sizeof(addr.sun_path) - 1 ) ) { + evutil_closesocket( s ); + goto fail; + } + memset( &addr, '\0', sizeof(addr) ); + addr.sun_family = AF_LOCAL; + strcpy( addr.sun_path, b->b_host ); + + rc = connect( + s, (struct sockaddr *)&addr, sizeof(struct sockaddr_un) ); + /* Asynchronous connect */ + if ( rc ) { + LloadPendingConnection *conn; + + if ( errno != EINPROGRESS && errno != EWOULDBLOCK ) { + evutil_closesocket( s ); + goto fail; + } + + conn = ch_calloc( 1, sizeof(LloadPendingConnection) ); + LDAP_LIST_ENTRY_INIT( conn, next ); + conn->backend = b; + conn->fd = s; + + conn->event = event_new( lload_get_base( s ), s, + EV_WRITE|EV_PERSIST, upstream_connect_cb, conn ); + if ( !conn->event ) { + Debug( LDAP_DEBUG_ANY, "backend_connect: " + "failed to acquire an event to finish upstream " + "connection setup.\n" ); + ch_free( conn ); + evutil_closesocket( s ); + goto fail; + } + + event_add( conn->event, lload_timeout_net ); + LDAP_LIST_INSERT_HEAD( &b->b_connecting, conn, next ); + Debug( LDAP_DEBUG_CONNS, "backend_connect: " + "connection to backend uri=%s in progress\n", + b->b_uri.bv_val ); + } else if ( upstream_init( s, b ) == NULL ) { + goto fail; + } + + checked_unlock( &b->b_mutex ); + epoch_leave( epoch ); + return; + } +#endif /* LDAP_PF_LOCAL */ + + hints.ai_family = AF_UNSPEC; + hints.ai_flags = EVUTIL_AI_CANONNAME; + hints.ai_socktype = SOCK_STREAM; + hints.ai_protocol = IPPROTO_TCP; + + hostname = b->b_host; + + /* + * Picking any value on the stack. This is unique to our thread without + * having to call ldap_pvt_thread_self. + * We might have to revert to using ldap_pvt_thread_self eventually since + * this betrays where exactly our stack lies - potentially weakening some + * protections like ASLR. + */ + placeholder = (struct evdns_getaddrinfo_request *)&request; + b->b_dns_req = placeholder; + checked_unlock( &b->b_mutex ); + + request = evdns_getaddrinfo( + dnsbase, hostname, NULL, &hints, upstream_name_cb, b ); + + checked_lock( &b->b_mutex ); + assert( request || b->b_dns_req != placeholder ); + + /* Record the request, unless upstream_name_cb or another thread + * cleared it. Another thread is usually backend_reset or backend_connect + * if upstream_name_cb finished and scheduled another one */ + if ( b->b_dns_req == placeholder ) { + b->b_dns_req = request; + } + checked_unlock( &b->b_mutex ); + epoch_leave( epoch ); + return; + +fail: + b->b_opening--; + b->b_failed++; + backend_retry( b ); + checked_unlock( &b->b_mutex ); + epoch_leave( epoch ); +} + +void * +backend_connect_task( void *ctx, void *arg ) +{ + backend_connect( -1, 0, arg ); + return NULL; +} + +/* + * Needs exclusive access to the backend and no other thread is allowed to call + * backend_retry while we're handling this. + * + * If gentle == 0, a full pause must be in effect, else we risk deadlocking on + * event_free(). + */ +void +backend_reset( LloadBackend *b, int gentle ) +{ + assert_locked( &b->b_mutex ); + if ( b->b_cookie ) { + if ( ldap_pvt_thread_pool_retract( b->b_cookie ) ) { + b->b_cookie = NULL; + b->b_opening--; + } else { + /* + * The task might not be cancelable because it just started + * executing. + * + * Shutdown should be the only time when the thread pool is + * in that state. Keep the cookie in to keep an eye on whether + * it's finished yet. + */ + assert( slapd_shutdown ); + } + } + /* Not safe to hold our mutex and call event_del/free if the event's + * callback is running, relinquish the mutex while we do so. */ + if ( b->b_retry_event && + event_pending( b->b_retry_event, EV_TIMEOUT, NULL ) ) { + assert( b->b_failed ); + checked_unlock( &b->b_mutex ); + event_del( b->b_retry_event ); + checked_lock( &b->b_mutex ); + b->b_opening--; + } + if ( b->b_dns_req ) { + evdns_getaddrinfo_cancel( b->b_dns_req ); + b->b_dns_req = NULL; + b->b_opening--; + } + while ( !LDAP_LIST_EMPTY( &b->b_connecting ) ) { + LloadPendingConnection *pending = LDAP_LIST_FIRST( &b->b_connecting ); + + Debug( LDAP_DEBUG_CONNS, "backend_reset: " + "destroying socket pending connect() fd=%d\n", + pending->fd ); + + event_active( pending->event, EV_WRITE, 0 ); + evutil_closesocket( pending->fd ); + pending->fd = -1; + LDAP_LIST_REMOVE( pending, next ); + + if ( !gentle ) { + /* None of the event bases are running, we're safe to free the + * event right now and potentially free the backend itself */ + event_free( pending->event ); + ch_free( pending ); + } + /* else, just let the event dispose of the resources on its own later */ + b->b_opening--; + } + connections_walk( + &b->b_mutex, &b->b_preparing, lload_connection_close, &gentle ); + assert( LDAP_CIRCLEQ_EMPTY( &b->b_preparing ) ); + assert( b->b_opening == ( b->b_cookie ? 1 : 0 ) ); + b->b_failed = 0; + + connections_walk_last( &b->b_mutex, &b->b_bindconns, b->b_last_bindconn, + lload_connection_close, &gentle ); + assert( gentle || b->b_bindavail == 0 ); + + connections_walk_last( &b->b_mutex, &b->b_conns, b->b_last_conn, + lload_connection_close, &gentle ); + assert( gentle || b->b_active == 0 ); + assert_locked( &b->b_mutex ); +} + +void +lload_backend_destroy( LloadBackend *b ) +{ + LloadBackend *next = LDAP_CIRCLEQ_LOOP_NEXT( &backend, b, b_next ); + + Debug( LDAP_DEBUG_CONNS, "lload_backend_destroy: " + "destroying backend uri='%s', numconns=%d, numbindconns=%d\n", + b->b_uri.bv_val, b->b_numconns, b->b_numbindconns ); + + checked_lock( &b->b_mutex ); + b->b_numconns = b->b_numbindconns = 0; + backend_reset( b, 0 ); + + LDAP_CIRCLEQ_REMOVE( &backend, b, b_next ); + if ( b == next ) { + current_backend = NULL; + } else { + current_backend = next; + } + +#ifdef BALANCER_MODULE + if ( b->b_monitor ) { + BackendDB *be; + struct berval monitordn = BER_BVC("cn=monitor"); + int rc; + + be = select_backend( &monitordn, 0 ); + + /* FIXME: implement proper subsys shutdown in back-monitor or make + * backend just an entry, not a subsys */ + rc = b->b_monitor->mss_destroy( be, b->b_monitor ); + assert( rc == LDAP_SUCCESS ); + } +#endif /* BALANCER_MODULE */ + checked_unlock( &b->b_mutex ); + ldap_pvt_thread_mutex_destroy( &b->b_mutex ); + + if ( b->b_retry_event ) { + event_del( b->b_retry_event ); + event_free( b->b_retry_event ); + b->b_retry_event = NULL; + } + + ch_free( b->b_host ); + ch_free( b->b_uri.bv_val ); + ch_free( b->b_name.bv_val ); + ch_free( b ); +} + +void +lload_backends_destroy( void ) +{ + while ( !LDAP_CIRCLEQ_EMPTY( &backend ) ) { + LloadBackend *b = LDAP_CIRCLEQ_FIRST( &backend ); + + lload_backend_destroy( b ); + } +} |