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, 1886 insertions, 0 deletions

diff --git a/servers/lloadd/daemon.c b/servers/lloadd/daemon.c
new file mode 100644
index 0000000..48bcf6a
--- /dev/null
+++ b/servers/lloadd/daemon.c
@@ -0,0 +1,1886 @@
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2022 The OpenLDAP Foundation.
+ * Portions Copyright 2007 by Howard Chu, 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>.
+ */
+/* Portions Copyright (c) 1995 Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and that due credit is given
+ * to the University of Michigan at Ann Arbor. The name of the University
+ * may not be used to endorse or promote products derived from this
+ * software without specific prior written permission. This software
+ * is provided ``as is'' without express or implied warranty.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/ctype.h>
+#include <ac/errno.h>
+#include <ac/socket.h>
+#include <ac/string.h>
+#include <ac/time.h>
+#include <ac/unistd.h>
+
+#include <event2/event.h>
+#include <event2/dns.h>
+#include <event2/listener.h>
+
+#include "lload.h"
+#include "ldap_pvt_thread.h"
+#include "lutil.h"
+
+#include "ldap_rq.h"
+
+#ifdef HAVE_SYSTEMD_SD_DAEMON_H
+#include <systemd/sd-daemon.h>
+#endif
+
+#ifdef LDAP_PF_LOCAL
+#include <sys/stat.h>
+/* this should go in <ldap.h> as soon as it is accepted */
+#define LDAPI_MOD_URLEXT "x-mod"
+#endif /* LDAP_PF_LOCAL */
+
+#ifndef BALANCER_MODULE
+#ifdef LDAP_PF_INET6
+int slap_inet4or6 = AF_UNSPEC;
+#else /* ! INETv6 */
+int slap_inet4or6 = AF_INET;
+#endif /* ! INETv6 */
+
+/* globals */
+time_t starttime;
+struct runqueue_s slapd_rq;
+
+#ifdef LDAP_TCP_BUFFER
+int slapd_tcp_rmem;
+int slapd_tcp_wmem;
+#endif /* LDAP_TCP_BUFFER */
+
+volatile sig_atomic_t slapd_shutdown = 0;
+volatile sig_atomic_t slapd_gentle_shutdown = 0;
+volatile sig_atomic_t slapd_abrupt_shutdown = 0;
+#endif /* !BALANCER_MODULE */
+
+static int emfile;
+
+ldap_pvt_thread_mutex_t lload_wait_mutex;
+ldap_pvt_thread_cond_t lload_wait_cond;
+ldap_pvt_thread_cond_t lload_pause_cond;
+
+#ifndef SLAPD_MAX_DAEMON_THREADS
+#define SLAPD_MAX_DAEMON_THREADS 16
+#endif
+int lload_daemon_threads = 1;
+int lload_daemon_mask;
+
+struct event_base *listener_base = NULL;
+LloadListener **lload_listeners = NULL;
+static ldap_pvt_thread_t listener_tid, *daemon_tid;
+
+struct event_base *daemon_base = NULL;
+struct evdns_base *dnsbase;
+
+struct event *lload_timeout_event;
+
+/*
+ * global lload statistics. Not mutex protected to preserve performance -
+ * increment is atomic, at most we risk a bit of inconsistency
+ */
+lload_global_stats_t lload_stats = {};
+
+#ifndef SLAPD_LISTEN_BACKLOG
+#define SLAPD_LISTEN_BACKLOG 1024
+#endif /* ! SLAPD_LISTEN_BACKLOG */
+
+#define DAEMON_ID(fd) ( fd & lload_daemon_mask )
+
+#ifdef HAVE_WINSOCK
+ldap_pvt_thread_mutex_t slapd_ws_mutex;
+SOCKET *slapd_ws_sockets;
+#define SD_READ 1
+#define SD_WRITE 2
+#define SD_ACTIVE 4
+#define SD_LISTENER 8
+#endif
+
+#ifdef HAVE_TCPD
+static ldap_pvt_thread_mutex_t sd_tcpd_mutex;
+#endif /* TCP Wrappers */
+
+typedef struct listener_item {
+    struct evconnlistener *listener;
+    ber_socket_t fd;
+} listener_item;
+
+typedef struct lload_daemon_st {
+    ldap_pvt_thread_mutex_t sd_mutex;
+
+    struct event_base *base;
+    struct event *wakeup_event;
+} lload_daemon_st;
+
+static lload_daemon_st lload_daemon[SLAPD_MAX_DAEMON_THREADS];
+
+static void daemon_wakeup_cb( evutil_socket_t sig, short what, void *arg );
+
+static void
+lloadd_close( ber_socket_t s )
+{
+    Debug( LDAP_DEBUG_CONNS, "lloadd_close: "
+            "closing fd=%ld\n",
+            (long)s );
+    tcp_close( s );
+}
+
+static void
+lload_free_listener_addresses( struct sockaddr **sal )
+{
+    struct sockaddr **sap;
+    if ( sal == NULL ) return;
+    for ( sap = sal; *sap != NULL; sap++ )
+        ch_free(*sap);
+    ch_free( sal );
+}
+
+#if defined(LDAP_PF_LOCAL) || defined(SLAP_X_LISTENER_MOD)
+static int
+get_url_perms( char **exts, mode_t *perms, int *crit )
+{
+    int i;
+
+    assert( exts != NULL );
+    assert( perms != NULL );
+    assert( crit != NULL );
+
+    *crit = 0;
+    for ( i = 0; exts[i]; i++ ) {
+        char *type = exts[i];
+        int c = 0;
+
+        if ( type[0] == '!' ) {
+            c = 1;
+            type++;
+        }
+
+        if ( strncasecmp( type, LDAPI_MOD_URLEXT "=",
+                     sizeof(LDAPI_MOD_URLEXT "=") - 1 ) == 0 ) {
+            char *value = type + ( sizeof(LDAPI_MOD_URLEXT "=") - 1 );
+            mode_t p = 0;
+            int j;
+
+            switch ( strlen( value ) ) {
+                case 4:
+                    /* skip leading '0' */
+                    if ( value[0] != '0' ) return LDAP_OTHER;
+                    value++;
+
+                case 3:
+                    for ( j = 0; j < 3; j++ ) {
+                        int v;
+
+                        v = value[j] - '0';
+
+                        if ( v < 0 || v > 7 ) return LDAP_OTHER;
+
+                        p |= v << 3 * ( 2 - j );
+                    }
+                    break;
+
+                case 10:
+                    for ( j = 1; j < 10; j++ ) {
+                        static mode_t m[] = { 0, S_IRUSR, S_IWUSR, S_IXUSR,
+                                S_IRGRP, S_IWGRP, S_IXGRP, S_IROTH, S_IWOTH,
+                                S_IXOTH };
+                        static const char c[] = "-rwxrwxrwx";
+
+                        if ( value[j] == c[j] ) {
+                            p |= m[j];
+
+                        } else if ( value[j] != '-' ) {
+                            return LDAP_OTHER;
+                        }
+                    }
+                    break;
+
+                default:
+                    return LDAP_OTHER;
+            }
+
+            *crit = c;
+            *perms = p;
+
+            return LDAP_SUCCESS;
+        }
+    }
+
+    return LDAP_OTHER;
+}
+#endif /* LDAP_PF_LOCAL || SLAP_X_LISTENER_MOD */
+
+/* port = 0 indicates AF_LOCAL */
+static int
+lload_get_listener_addresses(
+        const char *host,
+        unsigned short port,
+        struct sockaddr ***sal )
+{
+    struct sockaddr **sap;
+
+#ifdef LDAP_PF_LOCAL
+    if ( port == 0 ) {
+        sap = *sal = ch_malloc( 2 * sizeof(void *) );
+
+        *sap = ch_calloc( 1, sizeof(struct sockaddr_un) );
+        sap[1] = NULL;
+
+        if ( strlen( host ) >
+                ( sizeof( ((struct sockaddr_un *)*sap)->sun_path ) - 1 ) ) {
+            Debug( LDAP_DEBUG_ANY, "lload_get_listener_addresses: "
+                    "domain socket path (%s) too long in URL\n",
+                    host );
+            goto errexit;
+        }
+
+        (*sap)->sa_family = AF_LOCAL;
+        strcpy( ((struct sockaddr_un *)*sap)->sun_path, host );
+    } else
+#endif /* LDAP_PF_LOCAL */
+    {
+#ifdef HAVE_GETADDRINFO
+        struct addrinfo hints, *res, *sai;
+        int n, err;
+        char serv[7];
+
+        memset( &hints, '\0', sizeof(hints) );
+        hints.ai_flags = AI_PASSIVE;
+        hints.ai_socktype = SOCK_STREAM;
+        hints.ai_family = slap_inet4or6;
+        snprintf( serv, sizeof(serv), "%d", port );
+
+        if ( (err = getaddrinfo( host, serv, &hints, &res )) ) {
+            Debug( LDAP_DEBUG_ANY, "lload_get_listener_addresses: "
+                    "getaddrinfo() failed: %s\n",
+                    AC_GAI_STRERROR(err) );
+            return -1;
+        }
+
+        sai = res;
+        for ( n = 2; ( sai = sai->ai_next ) != NULL; n++ ) {
+            /* EMPTY */;
+        }
+        sap = *sal = ch_calloc( n, sizeof(void *) );
+
+        *sap = NULL;
+
+        for ( sai = res; sai; sai = sai->ai_next ) {
+            if ( sai->ai_addr == NULL ) {
+                Debug( LDAP_DEBUG_ANY, "lload_get_listener_addresses: "
+                        "getaddrinfo ai_addr is NULL?\n" );
+                freeaddrinfo( res );
+                goto errexit;
+            }
+
+            switch ( sai->ai_family ) {
+#ifdef LDAP_PF_INET6
+                case AF_INET6:
+                    *sap = ch_malloc( sizeof(struct sockaddr_in6) );
+                    *(struct sockaddr_in6 *)*sap =
+                            *((struct sockaddr_in6 *)sai->ai_addr);
+                    break;
+#endif /* LDAP_PF_INET6 */
+                case AF_INET:
+                    *sap = ch_malloc( sizeof(struct sockaddr_in) );
+                    *(struct sockaddr_in *)*sap =
+                            *((struct sockaddr_in *)sai->ai_addr);
+                    break;
+                default:
+                    *sap = NULL;
+                    break;
+            }
+
+            if ( *sap != NULL ) {
+                (*sap)->sa_family = sai->ai_family;
+                sap++;
+                *sap = NULL;
+            }
+        }
+
+        freeaddrinfo( res );
+
+#else /* ! HAVE_GETADDRINFO */
+        int i, n = 1;
+        struct in_addr in;
+        struct hostent *he = NULL;
+
+        if ( host == NULL ) {
+            in.s_addr = htonl( INADDR_ANY );
+
+        } else if ( !inet_aton( host, &in ) ) {
+            he = gethostbyname( host );
+            if ( he == NULL ) {
+                Debug( LDAP_DEBUG_ANY, "lload_get_listener_addresses: "
+                        "invalid host %s\n",
+                        host );
+                return -1;
+            }
+            for ( n = 0; he->h_addr_list[n]; n++ ) /* empty */;
+        }
+
+        sap = *sal = ch_malloc( ( n + 1 ) * sizeof(void *) );
+
+        for ( i = 0; i < n; i++ ) {
+            sap[i] = ch_calloc( 1, sizeof(struct sockaddr_in) );
+            sap[i]->sa_family = AF_INET;
+            ((struct sockaddr_in *)sap[i])->sin_port = htons( port );
+            AC_MEMCPY( &((struct sockaddr_in *)sap[i])->sin_addr,
+                    he ? (struct in_addr *)he->h_addr_list[i] : &in,
+                    sizeof(struct in_addr) );
+        }
+        sap[i] = NULL;
+#endif /* ! HAVE_GETADDRINFO */
+    }
+
+    return 0;
+
+errexit:
+    lload_free_listener_addresses(*sal);
+    return -1;
+}
+
+static int
+lload_open_listener(
+        const char *url,
+        LDAPURLDesc *lud,
+        int *listeners,
+        int *cur )
+{
+    int num, tmp, rc;
+    LloadListener l;
+    LloadListener *li;
+    unsigned short port;
+    int err, addrlen = 0;
+    struct sockaddr **sal = NULL, **psal;
+    int socktype = SOCK_STREAM; /* default to COTS */
+    ber_socket_t s;
+    char ebuf[128];
+
+#if defined(LDAP_PF_LOCAL) || defined(SLAP_X_LISTENER_MOD)
+    /*
+     * use safe defaults
+     */
+    int crit = 1;
+#endif /* LDAP_PF_LOCAL || SLAP_X_LISTENER_MOD */
+
+    assert( url );
+    assert( lud );
+
+    l.sl_url.bv_val = NULL;
+    l.sl_mute = 0;
+    l.sl_busy = 0;
+
+#ifndef HAVE_TLS
+    if ( ldap_pvt_url_scheme2tls( lud->lud_scheme ) ) {
+        Debug( LDAP_DEBUG_ANY, "lload_open_listener: "
+                "TLS not supported (%s)\n",
+                url );
+        ldap_free_urldesc( lud );
+        return -1;
+    }
+
+    if ( !lud->lud_port ) lud->lud_port = LDAP_PORT;
+
+#else /* HAVE_TLS */
+    l.sl_is_tls = ldap_pvt_url_scheme2tls( lud->lud_scheme );
+#endif /* HAVE_TLS */
+
+    l.sl_is_proxied = ldap_pvt_url_scheme2proxied( lud->lud_scheme );
+
+#ifdef LDAP_TCP_BUFFER
+    l.sl_tcp_rmem = 0;
+    l.sl_tcp_wmem = 0;
+#endif /* LDAP_TCP_BUFFER */
+
+    port = (unsigned short)lud->lud_port;
+
+    tmp = ldap_pvt_url_scheme2proto( lud->lud_scheme );
+    if ( tmp == LDAP_PROTO_IPC ) {
+#ifdef LDAP_PF_LOCAL
+        if ( lud->lud_host == NULL || lud->lud_host[0] == '\0' ) {
+            err = lload_get_listener_addresses( LDAPI_SOCK, 0, &sal );
+        } else {
+            err = lload_get_listener_addresses( lud->lud_host, 0, &sal );
+        }
+#else /* ! LDAP_PF_LOCAL */
+
+        Debug( LDAP_DEBUG_ANY, "lload_open_listener: "
+                "URL scheme not supported: %s\n",
+                url );
+        ldap_free_urldesc( lud );
+        return -1;
+#endif /* ! LDAP_PF_LOCAL */
+    } else {
+        if ( lud->lud_host == NULL || lud->lud_host[0] == '\0' ||
+                strcmp( lud->lud_host, "*" ) == 0 ) {
+            err = lload_get_listener_addresses( NULL, port, &sal );
+        } else {
+            err = lload_get_listener_addresses( lud->lud_host, port, &sal );
+        }
+    }
+
+#if defined(LDAP_PF_LOCAL) || defined(SLAP_X_LISTENER_MOD)
+    if ( lud->lud_exts ) {
+        err = get_url_perms( lud->lud_exts, &l.sl_perms, &crit );
+    } else {
+        l.sl_perms = S_IRWXU | S_IRWXO;
+    }
+#endif /* LDAP_PF_LOCAL || SLAP_X_LISTENER_MOD */
+
+    ldap_free_urldesc( lud );
+    if ( err ) {
+        lload_free_listener_addresses( sal );
+        return -1;
+    }
+
+    /* If we got more than one address returned, we need to make space
+     * for it in the lload_listeners array.
+     */
+    for ( num = 0; sal[num]; num++ ) /* empty */;
+    if ( num > 1 ) {
+        *listeners += num - 1;
+        lload_listeners = ch_realloc( lload_listeners,
+                ( *listeners + 1 ) * sizeof(LloadListener *) );
+    }
+
+    psal = sal;
+    while ( *sal != NULL ) {
+        char *af;
+        switch ( (*sal)->sa_family ) {
+            case AF_INET:
+                af = "IPv4";
+                break;
+#ifdef LDAP_PF_INET6
+            case AF_INET6:
+                af = "IPv6";
+                break;
+#endif /* LDAP_PF_INET6 */
+#ifdef LDAP_PF_LOCAL
+            case AF_LOCAL:
+                af = "Local";
+                break;
+#endif /* LDAP_PF_LOCAL */
+            default:
+                sal++;
+                continue;
+        }
+
+        s = socket( (*sal)->sa_family, socktype, 0 );
+        if ( s == AC_SOCKET_INVALID ) {
+            int err = sock_errno();
+            Debug( LDAP_DEBUG_ANY, "lload_open_listener: "
+                    "%s socket() failed errno=%d (%s)\n",
+                    af, err, sock_errstr( err, ebuf, sizeof(ebuf) ) );
+            sal++;
+            continue;
+        }
+        ber_pvt_socket_set_nonblock( s, 1 );
+        l.sl_sd = s;
+
+#ifdef LDAP_PF_LOCAL
+        if ( (*sal)->sa_family == AF_LOCAL ) {
+            unlink( ((struct sockaddr_un *)*sal)->sun_path );
+        } else
+#endif /* LDAP_PF_LOCAL */
+        {
+#ifdef SO_REUSEADDR
+            /* enable address reuse */
+            tmp = 1;
+            rc = setsockopt(
+                    s, SOL_SOCKET, SO_REUSEADDR, (char *)&tmp, sizeof(tmp) );
+            if ( rc == AC_SOCKET_ERROR ) {
+                int err = sock_errno();
+                Debug( LDAP_DEBUG_ANY, "lload_open_listener(%ld): "
+                        "setsockopt(SO_REUSEADDR) failed errno=%d (%s)\n",
+                        (long)l.sl_sd, err,
+                        sock_errstr( err, ebuf, sizeof(ebuf) ) );
+            }
+#endif /* SO_REUSEADDR */
+        }
+
+        switch ( (*sal)->sa_family ) {
+            case AF_INET:
+                addrlen = sizeof(struct sockaddr_in);
+                break;
+#ifdef LDAP_PF_INET6
+            case AF_INET6:
+#ifdef IPV6_V6ONLY
+                /* Try to use IPv6 sockets for IPv6 only */
+                tmp = 1;
+                rc = setsockopt( s, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&tmp,
+                        sizeof(tmp) );
+                if ( rc == AC_SOCKET_ERROR ) {
+                    int err = sock_errno();
+                    Debug( LDAP_DEBUG_ANY, "lload_open_listener(%ld): "
+                            "setsockopt(IPV6_V6ONLY) failed errno=%d (%s)\n",
+                            (long)l.sl_sd, err,
+                            sock_errstr( err, ebuf, sizeof(ebuf) ) );
+                }
+#endif /* IPV6_V6ONLY */
+                addrlen = sizeof(struct sockaddr_in6);
+                break;
+#endif /* LDAP_PF_INET6 */
+
+#ifdef LDAP_PF_LOCAL
+            case AF_LOCAL:
+#ifdef LOCAL_CREDS
+            {
+                int one = 1;
+                setsockopt( s, 0, LOCAL_CREDS, &one, sizeof(one) );
+            }
+#endif /* LOCAL_CREDS */
+
+                addrlen = sizeof(struct sockaddr_un);
+                break;
+#endif /* LDAP_PF_LOCAL */
+        }
+
+#ifdef LDAP_PF_LOCAL
+        /* create socket with all permissions set for those systems
+         * that honor permissions on sockets (e.g. Linux); typically,
+         * only write is required.  To exploit filesystem permissions,
+         * place the socket in a directory and use directory's
+         * permissions.  Need write perms to the directory to
+         * create/unlink the socket; likely need exec perms to access
+         * the socket (ITS#4709) */
+        {
+            mode_t old_umask = 0;
+
+            if ( (*sal)->sa_family == AF_LOCAL ) {
+                old_umask = umask( 0 );
+            }
+#endif /* LDAP_PF_LOCAL */
+            rc = bind( s, *sal, addrlen );
+#ifdef LDAP_PF_LOCAL
+            if ( old_umask != 0 ) {
+                umask( old_umask );
+            }
+        }
+#endif /* LDAP_PF_LOCAL */
+        if ( rc ) {
+            err = sock_errno();
+            Debug( LDAP_DEBUG_ANY, "lload_open_listener: "
+                    "bind(%ld) failed errno=%d (%s)\n",
+                    (long)l.sl_sd, err,
+                    sock_errstr( err, ebuf, sizeof(ebuf) ) );
+            tcp_close( s );
+            sal++;
+            continue;
+        }
+
+        switch ( (*sal)->sa_family ) {
+#ifdef LDAP_PF_LOCAL
+            case AF_LOCAL: {
+                char *path = ((struct sockaddr_un *)*sal)->sun_path;
+                l.sl_name.bv_len = strlen( path ) + STRLENOF("PATH=");
+                l.sl_name.bv_val = ch_malloc( l.sl_name.bv_len + 1 );
+                snprintf( l.sl_name.bv_val, l.sl_name.bv_len + 1, "PATH=%s",
+                        path );
+            } break;
+#endif /* LDAP_PF_LOCAL */
+
+            case AF_INET: {
+                char addr[INET_ADDRSTRLEN];
+                const char *s;
+#if defined(HAVE_GETADDRINFO) && defined(HAVE_INET_NTOP)
+                s = inet_ntop( AF_INET,
+                        &((struct sockaddr_in *)*sal)->sin_addr, addr,
+                        sizeof(addr) );
+#else /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */
+                s = inet_ntoa( ((struct sockaddr_in *)*sal)->sin_addr );
+#endif /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */
+                if ( !s ) s = SLAP_STRING_UNKNOWN;
+                port = ntohs( ((struct sockaddr_in *)*sal)->sin_port );
+                l.sl_name.bv_val =
+                        ch_malloc( sizeof("IP=255.255.255.255:65535") );
+                snprintf( l.sl_name.bv_val,
+                        sizeof("IP=255.255.255.255:65535"), "IP=%s:%d", s,
+                        port );
+                l.sl_name.bv_len = strlen( l.sl_name.bv_val );
+            } break;
+
+#ifdef LDAP_PF_INET6
+            case AF_INET6: {
+                char addr[INET6_ADDRSTRLEN];
+                const char *s;
+                s = inet_ntop( AF_INET6,
+                        &((struct sockaddr_in6 *)*sal)->sin6_addr, addr,
+                        sizeof(addr) );
+                if ( !s ) s = SLAP_STRING_UNKNOWN;
+                port = ntohs( ((struct sockaddr_in6 *)*sal)->sin6_port );
+                l.sl_name.bv_len = strlen( s ) + sizeof("IP=[]:65535");
+                l.sl_name.bv_val = ch_malloc( l.sl_name.bv_len );
+                snprintf( l.sl_name.bv_val, l.sl_name.bv_len, "IP=[%s]:%d", s,
+                        port );
+                l.sl_name.bv_len = strlen( l.sl_name.bv_val );
+            } break;
+#endif /* LDAP_PF_INET6 */
+
+            default:
+                Debug( LDAP_DEBUG_ANY, "lload_open_listener: "
+                        "unsupported address family (%d)\n",
+                        (int)(*sal)->sa_family );
+                break;
+        }
+
+        AC_MEMCPY( &l.sl_sa, *sal, addrlen );
+        ber_str2bv( url, 0, 1, &l.sl_url );
+        li = ch_malloc( sizeof(LloadListener) );
+        *li = l;
+        lload_listeners[*cur] = li;
+        (*cur)++;
+        sal++;
+    }
+
+    lload_free_listener_addresses( psal );
+
+    if ( l.sl_url.bv_val == NULL ) {
+        Debug( LDAP_DEBUG_ANY, "lload_open_listener: "
+                "failed on %s\n",
+                url );
+        return -1;
+    }
+
+    Debug( LDAP_DEBUG_TRACE, "lload_open_listener: "
+            "listener initialized %s\n",
+            l.sl_url.bv_val );
+
+    return 0;
+}
+
+int
+lload_open_new_listener( const char *url, LDAPURLDesc *lud )
+{
+    int rc, i, j = 0;
+
+    for ( i = 0; lload_listeners && lload_listeners[i] != NULL;
+            i++ ) /* count */
+        ;
+    j = i;
+
+    i++;
+    lload_listeners = ch_realloc(
+            lload_listeners, ( i + 1 ) * sizeof(LloadListener *) );
+
+    rc = lload_open_listener( url, lud, &i, &j );
+    lload_listeners[j] = NULL;
+    return rc;
+}
+
+int lloadd_inited = 0;
+
+int
+lloadd_listeners_init( const char *urls )
+{
+    int i, j, n;
+    char **u;
+    LDAPURLDesc *lud;
+
+    Debug( LDAP_DEBUG_ARGS, "lloadd_listeners_init: %s\n",
+            urls ? urls : "<null>" );
+
+#ifdef HAVE_TCPD
+    ldap_pvt_thread_mutex_init( &sd_tcpd_mutex );
+#endif /* TCP Wrappers */
+
+    if ( urls == NULL ) urls = "ldap:///";
+
+    u = ldap_str2charray( urls, " " );
+
+    if ( u == NULL || u[0] == NULL ) {
+        Debug( LDAP_DEBUG_ANY, "lloadd_listeners_init: "
+                "no urls (%s) provided\n",
+                urls );
+        if ( u ) ldap_charray_free( u );
+        return -1;
+    }
+
+    for ( i = 0; u[i] != NULL; i++ ) {
+        Debug( LDAP_DEBUG_TRACE, "lloadd_listeners_init: "
+                "listen on %s\n",
+                u[i] );
+    }
+
+    if ( i == 0 ) {
+        Debug( LDAP_DEBUG_ANY, "lloadd_listeners_init: "
+                "no listeners to open (%s)\n",
+                urls );
+        ldap_charray_free( u );
+        return -1;
+    }
+
+    Debug( LDAP_DEBUG_TRACE, "lloadd_listeners_init: "
+            "%d listeners to open...\n",
+            i );
+    lload_listeners = ch_malloc( ( i + 1 ) * sizeof(LloadListener *) );
+
+    for ( n = 0, j = 0; u[n]; n++ ) {
+        if ( ldap_url_parse_ext( u[n], &lud, LDAP_PVT_URL_PARSE_DEF_PORT ) ) {
+            Debug( LDAP_DEBUG_ANY, "lloadd_listeners_init: "
+                    "could not parse url %s\n",
+                    u[n] );
+            ldap_charray_free( u );
+            return -1;
+        }
+
+        if ( lload_open_listener( u[n], lud, &i, &j ) ) {
+            ldap_charray_free( u );
+            return -1;
+        }
+    }
+    lload_listeners[j] = NULL;
+
+    Debug( LDAP_DEBUG_TRACE, "lloadd_listeners_init: "
+            "%d listeners opened\n",
+            i );
+
+    ldap_charray_free( u );
+
+    return !i;
+}
+
+int
+lloadd_daemon_destroy( void )
+{
+    epoch_shutdown();
+    if ( lloadd_inited ) {
+        int i;
+
+        for ( i = 0; i < lload_daemon_threads; i++ ) {
+            ldap_pvt_thread_mutex_destroy( &lload_daemon[i].sd_mutex );
+            if ( lload_daemon[i].wakeup_event ) {
+                event_free( lload_daemon[i].wakeup_event );
+            }
+            if ( lload_daemon[i].base ) {
+                event_base_free( lload_daemon[i].base );
+            }
+        }
+
+        event_base_free( daemon_base );
+        daemon_base = NULL;
+
+        lloadd_inited = 0;
+#ifdef HAVE_TCPD
+        ldap_pvt_thread_mutex_destroy( &sd_tcpd_mutex );
+#endif /* TCP Wrappers */
+    }
+
+    return 0;
+}
+
+static void
+destroy_listeners( void )
+{
+    LloadListener *lr, **ll = lload_listeners;
+
+    if ( ll == NULL ) return;
+
+    ldap_pvt_thread_join( listener_tid, (void *)NULL );
+
+    while ( (lr = *ll++) != NULL ) {
+        if ( lr->sl_url.bv_val ) {
+            ber_memfree( lr->sl_url.bv_val );
+        }
+
+        if ( lr->sl_name.bv_val ) {
+            ber_memfree( lr->sl_name.bv_val );
+        }
+
+#ifdef LDAP_PF_LOCAL
+        if ( lr->sl_sa.sa_addr.sa_family == AF_LOCAL ) {
+            unlink( lr->sl_sa.sa_un_addr.sun_path );
+        }
+#endif /* LDAP_PF_LOCAL */
+
+        evconnlistener_free( lr->listener );
+
+        free( lr );
+    }
+
+    free( lload_listeners );
+    lload_listeners = NULL;
+
+    if ( listener_base ) {
+        event_base_free( listener_base );
+    }
+}
+
+static void
+lload_listener(
+        struct evconnlistener *listener,
+        ber_socket_t s,
+        struct sockaddr *a,
+        int len,
+        void *arg )
+{
+    LloadListener *sl = arg;
+    LloadConnection *c;
+    Sockaddr *from = (Sockaddr *)a;
+    char peername[LDAP_IPADDRLEN];
+    struct berval peerbv = BER_BVC(peername);
+    int cflag;
+    int tid;
+    char ebuf[128];
+
+    Debug( LDAP_DEBUG_TRACE, ">>> lload_listener(%s)\n", sl->sl_url.bv_val );
+
+    peername[0] = '\0';
+
+    /* Resume the listener FD to allow concurrent-processing of
+     * additional incoming connections.
+     */
+    sl->sl_busy = 0;
+
+    tid = DAEMON_ID(s);
+
+    Debug( LDAP_DEBUG_CONNS, "lload_listener: "
+            "listen=%ld, new connection fd=%ld\n",
+            (long)sl->sl_sd, (long)s );
+
+#if defined(SO_KEEPALIVE) || defined(TCP_NODELAY)
+#ifdef LDAP_PF_LOCAL
+    /* for IPv4 and IPv6 sockets only */
+    if ( from->sa_addr.sa_family != AF_LOCAL )
+#endif /* LDAP_PF_LOCAL */
+    {
+        int rc;
+        int tmp;
+#ifdef SO_KEEPALIVE
+        /* enable keep alives */
+        tmp = 1;
+        rc = setsockopt(
+                s, SOL_SOCKET, SO_KEEPALIVE, (char *)&tmp, sizeof(tmp) );
+        if ( rc == AC_SOCKET_ERROR ) {
+            int err = sock_errno();
+            Debug( LDAP_DEBUG_ANY, "lload_listener(%ld): "
+                    "setsockopt(SO_KEEPALIVE) failed errno=%d (%s)\n",
+                    (long)s, err, sock_errstr( err, ebuf, sizeof(ebuf) ) );
+        }
+#endif /* SO_KEEPALIVE */
+#ifdef TCP_NODELAY
+        /* enable no delay */
+        tmp = 1;
+        rc = setsockopt(
+                s, IPPROTO_TCP, TCP_NODELAY, (char *)&tmp, sizeof(tmp) );
+        if ( rc == AC_SOCKET_ERROR ) {
+            int err = sock_errno();
+            Debug( LDAP_DEBUG_ANY, "lload_listener(%ld): "
+                    "setsockopt(TCP_NODELAY) failed errno=%d (%s)\n",
+                    (long)s, err, sock_errstr( err, ebuf, sizeof(ebuf) ) );
+        }
+#endif /* TCP_NODELAY */
+    }
+#endif /* SO_KEEPALIVE || TCP_NODELAY */
+
+    if ( sl->sl_is_proxied ) {
+        if ( !proxyp( s, from ) ) {
+            Debug( LDAP_DEBUG_ANY, "lload_listener: "
+                    "proxyp(%ld) failed\n",
+                    (long)s );
+            lloadd_close( s );
+            return;
+        }
+    }
+
+    cflag = 0;
+    switch ( from->sa_addr.sa_family ) {
+#ifdef LDAP_PF_LOCAL
+        case AF_LOCAL:
+            cflag |= CONN_IS_IPC;
+
+            /* FIXME: apparently accept doesn't fill the sun_path member */
+            sprintf( peername, "PATH=%s", sl->sl_sa.sa_un_addr.sun_path );
+            break;
+#endif /* LDAP_PF_LOCAL */
+
+#ifdef LDAP_PF_INET6
+        case AF_INET6:
+#endif /* LDAP_PF_INET6 */
+        case AF_INET:
+            ldap_pvt_sockaddrstr( from, &peerbv );
+            break;
+
+        default:
+            lloadd_close( s );
+            return;
+    }
+
+#ifdef HAVE_TLS
+    if ( sl->sl_is_tls ) cflag |= CONN_IS_TLS;
+#endif
+    c = client_init( s, peername, lload_daemon[tid].base, cflag );
+
+    if ( !c ) {
+        Debug( LDAP_DEBUG_ANY, "lload_listener: "
+                "client_init(%ld, %s, %s) failed\n",
+                (long)s, peername, sl->sl_name.bv_val );
+        lloadd_close( s );
+    }
+
+    return;
+}
+
+static void *
+lload_listener_thread( void *ctx )
+{
+    int rc = event_base_dispatch( listener_base );
+    Debug( LDAP_DEBUG_ANY, "lload_listener_thread: "
+            "event loop finished: rc=%d\n",
+            rc );
+
+    return (void *)NULL;
+}
+
+static void
+listener_error_cb( struct evconnlistener *lev, void *arg )
+{
+    LloadListener *l = arg;
+    int err = EVUTIL_SOCKET_ERROR();
+
+    assert( l->listener == lev );
+    if (
+#ifdef EMFILE
+            err == EMFILE ||
+#endif /* EMFILE */
+#ifdef ENFILE
+            err == ENFILE ||
+#endif /* ENFILE */
+            0 ) {
+        ldap_pvt_thread_mutex_lock( &lload_daemon[0].sd_mutex );
+        emfile++;
+        /* Stop listening until an existing session closes */
+        l->sl_mute = 1;
+        evconnlistener_disable( lev );
+        ldap_pvt_thread_mutex_unlock( &lload_daemon[0].sd_mutex );
+        Debug( LDAP_DEBUG_ANY, "listener_error_cb: "
+                "too many open files, cannot accept new connections on "
+                "url=%s\n",
+                l->sl_url.bv_val );
+    } else {
+        char ebuf[128];
+        Debug( LDAP_DEBUG_ANY, "listener_error_cb: "
+                "received an error on a listener, shutting down: '%s'\n",
+                sock_errstr( err, ebuf, sizeof(ebuf) ) );
+        event_base_loopexit( l->base, NULL );
+    }
+}
+
+void
+listeners_reactivate( void )
+{
+    int i;
+
+    ldap_pvt_thread_mutex_lock( &lload_daemon[0].sd_mutex );
+    for ( i = 0; emfile && lload_listeners[i] != NULL; i++ ) {
+        LloadListener *lr = lload_listeners[i];
+
+        if ( lr->sl_sd == AC_SOCKET_INVALID ) continue;
+        if ( lr->sl_mute ) {
+            emfile--;
+            evconnlistener_enable( lr->listener );
+            lr->sl_mute = 0;
+            Debug( LDAP_DEBUG_CONNS, "listeners_reactivate: "
+                    "reactivated listener url=%s\n",
+                    lr->sl_url.bv_val );
+        }
+    }
+    if ( emfile && lload_listeners[i] == NULL ) {
+        /* Walked the entire list without enabling anything; emfile
+         * counter is stale. Reset it. */
+        emfile = 0;
+    }
+    ldap_pvt_thread_mutex_unlock( &lload_daemon[0].sd_mutex );
+}
+
+static int
+lload_listener_activate( void )
+{
+    struct evconnlistener *listener;
+    int l, rc;
+    char ebuf[128];
+
+    listener_base = event_base_new();
+    if ( !listener_base ) return -1;
+
+    for ( l = 0; lload_listeners[l] != NULL; l++ ) {
+        if ( lload_listeners[l]->sl_sd == AC_SOCKET_INVALID ) continue;
+
+            /* FIXME: TCP-only! */
+#ifdef LDAP_TCP_BUFFER
+        if ( 1 ) {
+            int origsize, size, realsize, rc;
+            socklen_t optlen;
+
+            size = 0;
+            if ( lload_listeners[l]->sl_tcp_rmem > 0 ) {
+                size = lload_listeners[l]->sl_tcp_rmem;
+            } else if ( slapd_tcp_rmem > 0 ) {
+                size = slapd_tcp_rmem;
+            }
+
+            if ( size > 0 ) {
+                optlen = sizeof(origsize);
+                rc = getsockopt( lload_listeners[l]->sl_sd, SOL_SOCKET,
+                        SO_RCVBUF, (void *)&origsize, &optlen );
+
+                if ( rc ) {
+                    int err = sock_errno();
+                    Debug( LDAP_DEBUG_ANY, "lload_listener_activate: "
+                            "getsockopt(SO_RCVBUF) failed errno=%d (%s)\n",
+                            err, AC_STRERROR_R( err, ebuf, sizeof(ebuf) ) );
+                }
+
+                optlen = sizeof(size);
+                rc = setsockopt( lload_listeners[l]->sl_sd, SOL_SOCKET,
+                        SO_RCVBUF, (const void *)&size, optlen );
+
+                if ( rc ) {
+                    int err = sock_errno();
+                    Debug( LDAP_DEBUG_ANY, "lload_listener_activate: "
+                            "setsockopt(SO_RCVBUF) failed errno=%d (%s)\n",
+                            err, sock_errstr( err, ebuf, sizeof(ebuf) ) );
+                }
+
+                optlen = sizeof(realsize);
+                rc = getsockopt( lload_listeners[l]->sl_sd, SOL_SOCKET,
+                        SO_RCVBUF, (void *)&realsize, &optlen );
+
+                if ( rc ) {
+                    int err = sock_errno();
+                    Debug( LDAP_DEBUG_ANY, "lload_listener_activate: "
+                            "getsockopt(SO_RCVBUF) failed errno=%d (%s)\n",
+                            err, sock_errstr( err, ebuf, sizeof(ebuf) ) );
+                }
+
+                Debug( LDAP_DEBUG_ANY, "lload_listener_activate: "
+                        "url=%s (#%d) RCVBUF original size=%d requested "
+                        "size=%d real size=%d\n",
+                        lload_listeners[l]->sl_url.bv_val, l, origsize, size,
+                        realsize );
+            }
+
+            size = 0;
+            if ( lload_listeners[l]->sl_tcp_wmem > 0 ) {
+                size = lload_listeners[l]->sl_tcp_wmem;
+            } else if ( slapd_tcp_wmem > 0 ) {
+                size = slapd_tcp_wmem;
+            }
+
+            if ( size > 0 ) {
+                optlen = sizeof(origsize);
+                rc = getsockopt( lload_listeners[l]->sl_sd, SOL_SOCKET,
+                        SO_SNDBUF, (void *)&origsize, &optlen );
+
+                if ( rc ) {
+                    int err = sock_errno();
+                    Debug( LDAP_DEBUG_ANY, "lload_listener_activate: "
+                            "getsockopt(SO_SNDBUF) failed errno=%d (%s)\n",
+                            err, sock_errstr( err, ebuf, sizeof(ebuf) ) );
+                }
+
+                optlen = sizeof(size);
+                rc = setsockopt( lload_listeners[l]->sl_sd, SOL_SOCKET,
+                        SO_SNDBUF, (const void *)&size, optlen );
+
+                if ( rc ) {
+                    int err = sock_errno();
+                    Debug( LDAP_DEBUG_ANY, "lload_listener_activate: "
+                            "setsockopt(SO_SNDBUF) failed errno=%d (%s)\n",
+                            err, sock_errstr( err, ebuf, sizeof(ebuf) ) );
+                }
+
+                optlen = sizeof(realsize);
+                rc = getsockopt( lload_listeners[l]->sl_sd, SOL_SOCKET,
+                        SO_SNDBUF, (void *)&realsize, &optlen );
+
+                if ( rc ) {
+                    int err = sock_errno();
+                    Debug( LDAP_DEBUG_ANY, "lload_listener_activate: "
+                            "getsockopt(SO_SNDBUF) failed errno=%d (%s)\n",
+                            err, sock_errstr( err, ebuf, sizeof(ebuf) ) );
+                }
+
+                Debug( LDAP_DEBUG_ANY, "lload_listener_activate: "
+                        "url=%s (#%d) SNDBUF original size=%d requested "
+                        "size=%d real size=%d\n",
+                        lload_listeners[l]->sl_url.bv_val, l, origsize, size,
+                        realsize );
+            }
+        }
+#endif /* LDAP_TCP_BUFFER */
+
+        lload_listeners[l]->sl_busy = 1;
+        listener = evconnlistener_new( listener_base, lload_listener,
+                lload_listeners[l],
+                LEV_OPT_THREADSAFE|LEV_OPT_DEFERRED_ACCEPT,
+                SLAPD_LISTEN_BACKLOG, lload_listeners[l]->sl_sd );
+        if ( !listener ) {
+            int err = sock_errno();
+
+#ifdef LDAP_PF_INET6
+            /* If error is EADDRINUSE, we are trying to listen to INADDR_ANY and
+             * we are already listening to in6addr_any, then we want to ignore
+             * this and continue.
+             */
+            if ( err == EADDRINUSE ) {
+                int i;
+                struct sockaddr_in sa = lload_listeners[l]->sl_sa.sa_in_addr;
+                struct sockaddr_in6 sa6;
+
+                if ( sa.sin_family == AF_INET &&
+                        sa.sin_addr.s_addr == htonl( INADDR_ANY ) ) {
+                    for ( i = 0; i < l; i++ ) {
+                        sa6 = lload_listeners[i]->sl_sa.sa_in6_addr;
+                        if ( sa6.sin6_family == AF_INET6 &&
+                                !memcmp( &sa6.sin6_addr, &in6addr_any,
+                                        sizeof(struct in6_addr) ) ) {
+                            break;
+                        }
+                    }
+
+                    if ( i < l ) {
+                        /* We are already listening to in6addr_any */
+                        Debug( LDAP_DEBUG_CONNS, "lload_listener_activate: "
+                                "Attempt to listen to 0.0.0.0 failed, "
+                                "already listening on ::, assuming IPv4 "
+                                "included\n" );
+                        lloadd_close( lload_listeners[l]->sl_sd );
+                        lload_listeners[l]->sl_sd = AC_SOCKET_INVALID;
+                        continue;
+                    }
+                }
+            }
+#endif /* LDAP_PF_INET6 */
+            Debug( LDAP_DEBUG_ANY, "lload_listener_activate: "
+                    "listen(%s, 5) failed errno=%d (%s)\n",
+                    lload_listeners[l]->sl_url.bv_val, err,
+                    sock_errstr( err, ebuf, sizeof(ebuf) ) );
+            return -1;
+        }
+
+        lload_listeners[l]->base = listener_base;
+        lload_listeners[l]->listener = listener;
+        evconnlistener_set_error_cb( listener, listener_error_cb );
+    }
+
+    rc = ldap_pvt_thread_create(
+            &listener_tid, 0, lload_listener_thread, lload_listeners[l] );
+
+    if ( rc != 0 ) {
+        Debug( LDAP_DEBUG_ANY, "lload_listener_activate(%d): "
+                "submit failed (%d)\n",
+                lload_listeners[l]->sl_sd, rc );
+    }
+    return rc;
+}
+
+static void *
+lloadd_io_task( void *ptr )
+{
+    int rc;
+    int tid = (ldap_pvt_thread_t *)ptr - daemon_tid;
+    struct event_base *base = lload_daemon[tid].base;
+    struct event *event;
+
+    event = event_new( base, -1, EV_WRITE, daemon_wakeup_cb, ptr );
+    if ( !event ) {
+        Debug( LDAP_DEBUG_ANY, "lloadd_io_task: "
+                "failed to set up the wakeup event\n" );
+        return (void *)-1;
+    }
+    event_add( event, NULL );
+    lload_daemon[tid].wakeup_event = event;
+
+    /* run */
+    rc = event_base_dispatch( base );
+    Debug( LDAP_DEBUG_ANY, "lloadd_io_task: "
+            "Daemon %d, event loop finished: rc=%d\n",
+            tid, rc );
+
+    if ( !slapd_gentle_shutdown ) {
+        slapd_abrupt_shutdown = 1;
+    }
+
+    return NULL;
+}
+
+int
+lloadd_daemon( struct event_base *daemon_base )
+{
+    int i, rc;
+    LloadBackend *b;
+    struct event_base *base;
+    struct event *event;
+
+    assert( daemon_base != NULL );
+
+    dnsbase = evdns_base_new( daemon_base, EVDNS_BASE_INITIALIZE_NAMESERVERS );
+    if ( !dnsbase ) {
+        Debug( LDAP_DEBUG_ANY, "lloadd startup: "
+                "failed to set up for async name resolution\n" );
+        return -1;
+    }
+
+    if ( lload_daemon_threads > SLAPD_MAX_DAEMON_THREADS )
+        lload_daemon_threads = SLAPD_MAX_DAEMON_THREADS;
+
+    daemon_tid =
+            ch_malloc( lload_daemon_threads * sizeof(ldap_pvt_thread_t) );
+
+    for ( i = 0; i < lload_daemon_threads; i++ ) {
+        base = event_base_new();
+        if ( !base ) {
+            Debug( LDAP_DEBUG_ANY, "lloadd startup: "
+                    "failed to acquire event base for an I/O thread\n" );
+            return -1;
+        }
+        lload_daemon[i].base = base;
+
+        ldap_pvt_thread_mutex_init( &lload_daemon[i].sd_mutex );
+        /* threads that handle client and upstream sockets */
+        rc = ldap_pvt_thread_create(
+                &daemon_tid[i], 0, lloadd_io_task, &daemon_tid[i] );
+
+        if ( rc != 0 ) {
+            Debug( LDAP_DEBUG_ANY, "lloadd startup: "
+                    "listener ldap_pvt_thread_create failed (%d)\n",
+                    rc );
+            return rc;
+        }
+    }
+
+    if ( (rc = lload_listener_activate()) != 0 ) {
+        return rc;
+    }
+
+    if ( !LDAP_CIRCLEQ_EMPTY( &backend ) ) {
+        current_backend = LDAP_CIRCLEQ_FIRST( &backend );
+        LDAP_CIRCLEQ_FOREACH ( b, &backend, b_next ) {
+            event = evtimer_new( daemon_base, backend_connect, b );
+            if ( !event ) {
+                Debug( LDAP_DEBUG_ANY, "lloadd: "
+                        "failed to allocate retry event\n" );
+                return -1;
+            }
+
+            checked_lock( &b->b_mutex );
+            b->b_retry_event = event;
+            backend_retry( b );
+            checked_unlock( &b->b_mutex );
+        }
+    }
+
+    event = evtimer_new( daemon_base, operations_timeout, event_self_cbarg() );
+    if ( !event ) {
+        Debug( LDAP_DEBUG_ANY, "lloadd: "
+                "failed to allocate timeout event\n" );
+        return -1;
+    }
+    lload_timeout_event = event;
+
+    /* TODO: should we just add it with any timeout and re-add when the timeout
+     * changes? */
+    if ( lload_timeout_api ) {
+        event_add( event, lload_timeout_api );
+    }
+
+    checked_lock( &lload_wait_mutex );
+    lloadd_inited = 1;
+    ldap_pvt_thread_cond_signal( &lload_wait_cond );
+    checked_unlock( &lload_wait_mutex );
+#if !defined(BALANCER_MODULE) && defined(HAVE_SYSTEMD)
+    rc = sd_notify( 1, "READY=1" );
+    if ( rc < 0 ) {
+        Debug( LDAP_DEBUG_ANY, "lloadd startup: "
+            "systemd sd_notify failed (%d)\n", rc );
+    }
+#endif /* !BALANCER_MODULE && HAVE_SYSTEMD */
+
+    rc = event_base_dispatch( daemon_base );
+    Debug( LDAP_DEBUG_ANY, "lloadd shutdown: "
+            "Main event loop finished: rc=%d\n",
+            rc );
+
+    /* shutdown */
+    event_base_loopexit( listener_base, 0 );
+
+    /* wait for the listener threads to complete */
+    destroy_listeners();
+
+    /* Mark upstream connections closing and prevent from opening new ones */
+    LDAP_CIRCLEQ_FOREACH ( b, &backend, b_next ) {
+        epoch_t epoch = epoch_join();
+
+        checked_lock( &b->b_mutex );
+        b->b_numconns = b->b_numbindconns = 0;
+        backend_reset( b, 1 );
+        checked_unlock( &b->b_mutex );
+
+        epoch_leave( epoch );
+    }
+
+    /* Do the same for clients */
+    clients_destroy( 1 );
+
+    for ( i = 0; i < lload_daemon_threads; i++ ) {
+        /*
+         * https://github.com/libevent/libevent/issues/623
+         * deleting the event doesn't notify the base, just activate it and
+         * let it delete itself
+         */
+        event_active( lload_daemon[i].wakeup_event, EV_READ, 0 );
+    }
+
+    for ( i = 0; i < lload_daemon_threads; i++ ) {
+        ldap_pvt_thread_join( daemon_tid[i], (void *)NULL );
+    }
+
+#ifndef BALANCER_MODULE
+    if ( LogTest( LDAP_DEBUG_ANY ) ) {
+        int t = ldap_pvt_thread_pool_backload( &connection_pool );
+        Debug( LDAP_DEBUG_ANY, "lloadd shutdown: "
+                "waiting for %d operations/tasks to finish\n",
+                t );
+    }
+    ldap_pvt_thread_pool_close( &connection_pool, 1 );
+#endif
+
+    lload_backends_destroy();
+    clients_destroy( 0 );
+    lload_bindconf_free( &bindconf );
+    evdns_base_free( dnsbase, 0 );
+
+    ch_free( daemon_tid );
+    daemon_tid = NULL;
+
+    lloadd_daemon_destroy();
+
+    /* If we're a slapd module, let the thread that initiated the shut down
+     * know we've finished */
+    checked_lock( &lload_wait_mutex );
+    ldap_pvt_thread_cond_signal( &lload_wait_cond );
+    checked_unlock( &lload_wait_mutex );
+
+    return 0;
+}
+
+static void
+daemon_wakeup_cb( evutil_socket_t sig, short what, void *arg )
+{
+    int tid = (ldap_pvt_thread_t *)arg - daemon_tid;
+
+    Debug( LDAP_DEBUG_TRACE, "daemon_wakeup_cb: "
+            "Daemon thread %d woken up\n",
+            tid );
+    event_del( lload_daemon[tid].wakeup_event );
+}
+
+LloadChange lload_change = { .type = LLOAD_CHANGE_UNDEFINED };
+
+#ifdef BALANCER_MODULE
+int
+backend_conn_cb( ldap_pvt_thread_start_t *start, void *startarg, void *arg )
+{
+    LloadConnection *c = startarg;
+    LloadBackend *b = arg;
+
+    if ( b == NULL || c->c_backend == b ) {
+        CONNECTION_LOCK_DESTROY(c);
+        return 1;
+    }
+    return 0;
+}
+
+#ifdef HAVE_TLS
+int
+client_tls_cb( ldap_pvt_thread_start_t *start, void *startarg, void *arg )
+{
+    LloadConnection *c = startarg;
+
+    if ( c->c_destroy == client_destroy &&
+            c->c_is_tls == LLOAD_TLS_ESTABLISHED ) {
+        CONNECTION_LOCK_DESTROY(c);
+        return 1;
+    }
+    return 0;
+}
+#endif /* HAVE_TLS */
+
+void
+lload_handle_backend_invalidation( LloadChange *change )
+{
+    LloadBackend *b = change->target;
+
+    assert( change->object == LLOAD_BACKEND );
+
+    if ( change->type == LLOAD_CHANGE_ADD ) {
+        BackendInfo *mi = backend_info( "monitor" );
+
+        if ( mi ) {
+            monitor_extra_t *mbe = mi->bi_extra;
+            if ( mbe->is_configured() ) {
+                lload_monitor_backend_init( mi, b );
+            }
+        }
+
+        if ( !current_backend ) {
+            current_backend = b;
+        }
+        checked_lock( &b->b_mutex );
+        backend_retry( b );
+        checked_unlock( &b->b_mutex );
+        return;
+    } else if ( change->type == LLOAD_CHANGE_DEL ) {
+        ldap_pvt_thread_pool_walk(
+                &connection_pool, handle_pdus, backend_conn_cb, b );
+        ldap_pvt_thread_pool_walk(
+                &connection_pool, upstream_bind, backend_conn_cb, b );
+        lload_backend_destroy( b );
+        return;
+    }
+    assert( change->type == LLOAD_CHANGE_MODIFY );
+
+    /*
+     * A change that can't be handled gracefully, terminate all connections and
+     * start over.
+     */
+    if ( change->flags.backend & LLOAD_BACKEND_MOD_OTHER ) {
+        ldap_pvt_thread_pool_walk(
+                &connection_pool, handle_pdus, backend_conn_cb, b );
+        ldap_pvt_thread_pool_walk(
+                &connection_pool, upstream_bind, backend_conn_cb, b );
+        checked_lock( &b->b_mutex );
+        backend_reset( b, 0 );
+        backend_retry( b );
+        checked_unlock( &b->b_mutex );
+        return;
+    }
+
+    /*
+     * Handle changes to number of connections:
+     * - a change might get the connection limit above the pool size:
+     *   - consider closing (in order of priority?):
+     *     - connections awaiting connect() completion
+     *     - connections currently preparing
+     *     - bind connections over limit (which is 0 if 'feature vc' is on
+     *     - regular connections over limit
+     * - below pool size
+     *   - call backend_retry if there are no opening connections
+     * - one pool size above and one below the configured size
+     *   - still close the ones above limit, it should sort itself out
+     *     the only issue is if a closing connection isn't guaranteed to do
+     *     that at some point
+     */
+    if ( change->flags.backend & LLOAD_BACKEND_MOD_CONNS ) {
+        int bind_requested = 0, need_close = 0, need_open = 0;
+        LloadConnection *c;
+
+        bind_requested =
+#ifdef LDAP_API_FEATURE_VERIFY_CREDENTIALS
+                (lload_features & LLOAD_FEATURE_VC) ? 0 :
+#endif /* LDAP_API_FEATURE_VERIFY_CREDENTIALS */
+                b->b_numbindconns;
+
+        if ( b->b_bindavail > bind_requested ) {
+            need_close += b->b_bindavail - bind_requested;
+        } else if ( b->b_bindavail < bind_requested ) {
+            need_open = 1;
+        }
+
+        if ( b->b_active > b->b_numconns ) {
+            need_close += b->b_active - b->b_numconns;
+        } else if ( b->b_active < b->b_numconns ) {
+            need_open = 1;
+        }
+
+        if ( !need_open ) {
+            need_close += b->b_opening;
+
+            while ( !LDAP_LIST_EMPTY( &b->b_connecting ) ) {
+                LloadPendingConnection *p = LDAP_LIST_FIRST( &b->b_connecting );
+
+                LDAP_LIST_REMOVE( p, next );
+                event_free( p->event );
+                evutil_closesocket( p->fd );
+                ch_free( p );
+                b->b_opening--;
+                need_close--;
+            }
+        }
+
+        if ( need_close || !need_open ) {
+            /* It might be too late to repurpose a preparing connection, just
+             * close them all */
+            while ( !LDAP_CIRCLEQ_EMPTY( &b->b_preparing ) ) {
+                c = LDAP_CIRCLEQ_FIRST( &b->b_preparing );
+
+                event_del( c->c_read_event );
+                CONNECTION_LOCK_DESTROY(c);
+                assert( c == NULL );
+                b->b_opening--;
+                need_close--;
+            }
+            if ( event_pending( b->b_retry_event, EV_TIMEOUT, NULL ) ) {
+                event_del( b->b_retry_event );
+                b->b_opening--;
+            }
+            assert( b->b_opening == 0 );
+        }
+
+        if ( b->b_bindavail > bind_requested ) {
+            int diff = b->b_bindavail - bind_requested;
+
+            assert( need_close >= diff );
+
+            LDAP_CIRCLEQ_FOREACH ( c, &b->b_bindconns, c_next ) {
+                int gentle = 1;
+
+                lload_connection_close( c, &gentle );
+                need_close--;
+                diff--;
+                if ( !diff ) {
+                    break;
+                }
+            }
+            assert( diff == 0 );
+        }
+
+        if ( b->b_active > b->b_numconns ) {
+            int diff = b->b_active - b->b_numconns;
+
+            assert( need_close >= diff );
+
+            LDAP_CIRCLEQ_FOREACH ( c, &b->b_conns, c_next ) {
+                int gentle = 1;
+
+                lload_connection_close( c, &gentle );
+                need_close--;
+                diff--;
+                if ( !diff ) {
+                    break;
+                }
+            }
+            assert( diff == 0 );
+        }
+        assert( need_close == 0 );
+
+        if ( need_open ) {
+            checked_lock( &b->b_mutex );
+            backend_retry( b );
+            checked_unlock( &b->b_mutex );
+        }
+    }
+}
+
+void
+lload_handle_global_invalidation( LloadChange *change )
+{
+    assert( change->type == LLOAD_CHANGE_MODIFY );
+    assert( change->object == LLOAD_DAEMON );
+
+    if ( change->flags.daemon & LLOAD_DAEMON_MOD_THREADS ) {
+        /* walk the task queue to remove any tasks belonging to us. */
+        /* TODO: initiate a full module restart, everything will fall into
+         * place at that point */
+        ldap_pvt_thread_pool_walk(
+                &connection_pool, handle_pdus, backend_conn_cb, NULL );
+        ldap_pvt_thread_pool_walk(
+                &connection_pool, upstream_bind, backend_conn_cb, NULL );
+        assert(0);
+        return;
+    }
+
+    if ( change->flags.daemon & LLOAD_DAEMON_MOD_FEATURES ) {
+        lload_features_t feature_diff =
+                lload_features ^ ( ~(uintptr_t)change->target );
+        /* Feature change handling:
+         * - VC (TODO):
+         *   - on: terminate all bind connections
+         *   - off: cancel all bind operations in progress, reopen bind connections
+         * - ProxyAuthz:
+         *   - on: nothing needed
+         *   - off: clear c_auth/privileged on each client
+         * - read pause (WIP):
+         *   - nothing needed?
+         */
+
+        assert( change->target );
+        if ( feature_diff & LLOAD_FEATURE_VC ) {
+            assert(0);
+            feature_diff &= ~LLOAD_FEATURE_VC;
+        }
+        if ( feature_diff & LLOAD_FEATURE_PAUSE ) {
+            feature_diff &= ~LLOAD_FEATURE_PAUSE;
+        }
+        if ( feature_diff & LLOAD_FEATURE_PROXYAUTHZ ) {
+            if ( !(lload_features & LLOAD_FEATURE_PROXYAUTHZ) ) {
+                LloadConnection *c;
+                /* We switched proxyauthz off */
+                LDAP_CIRCLEQ_FOREACH ( c, &clients, c_next ) {
+                    if ( !BER_BVISNULL( &c->c_auth ) ) {
+                        ber_memfree( c->c_auth.bv_val );
+                        BER_BVZERO( &c->c_auth );
+                    }
+                    if ( c->c_type == LLOAD_C_PRIVILEGED ) {
+                        c->c_type = LLOAD_C_OPEN;
+                    }
+                }
+            }
+            feature_diff &= ~LLOAD_FEATURE_PROXYAUTHZ;
+        }
+        assert( !feature_diff );
+    }
+
+#ifdef HAVE_TLS
+    if ( change->flags.daemon & LLOAD_DAEMON_MOD_TLS ) {
+        /* terminate all clients with TLS set up */
+        ldap_pvt_thread_pool_walk(
+                &connection_pool, handle_pdus, client_tls_cb, NULL );
+        if ( !LDAP_CIRCLEQ_EMPTY( &clients ) ) {
+            LloadConnection *c = LDAP_CIRCLEQ_FIRST( &clients );
+            unsigned long first_connid = c->c_connid;
+
+            while ( c ) {
+                LloadConnection *next =
+                        LDAP_CIRCLEQ_LOOP_NEXT( &clients, c, c_next );
+                if ( c->c_is_tls ) {
+                    CONNECTION_LOCK_DESTROY(c);
+                    assert( c == NULL );
+                }
+                c = next;
+                if ( c->c_connid <= first_connid ) {
+                    c = NULL;
+                }
+            }
+        }
+    }
+#endif /* HAVE_TLS */
+
+    if ( change->flags.daemon & LLOAD_DAEMON_MOD_BINDCONF ) {
+        LloadBackend *b;
+        LloadConnection *c;
+
+        /*
+         * Only timeout changes can be handled gracefully, terminate all
+         * connections and start over.
+         */
+        ldap_pvt_thread_pool_walk(
+                &connection_pool, handle_pdus, backend_conn_cb, NULL );
+        ldap_pvt_thread_pool_walk(
+                &connection_pool, upstream_bind, backend_conn_cb, NULL );
+
+        LDAP_CIRCLEQ_FOREACH ( b, &backend, b_next ) {
+            checked_lock( &b->b_mutex );
+            backend_reset( b, 0 );
+            backend_retry( b );
+            checked_unlock( &b->b_mutex );
+        }
+
+        /* Reconsider the PRIVILEGED flag on all clients */
+        LDAP_CIRCLEQ_FOREACH ( c, &clients, c_next ) {
+            int privileged = ber_bvstrcasecmp( &c->c_auth, &lloadd_identity );
+
+            /* We have just terminated all pending operations (even pins), there
+             * should be no connections still binding/closing */
+            assert( c->c_state == LLOAD_C_READY );
+
+            c->c_type = privileged ? LLOAD_C_PRIVILEGED : LLOAD_C_OPEN;
+        }
+    }
+}
+
+int
+lload_handle_invalidation( LloadChange *change )
+{
+    if ( (change->type == LLOAD_CHANGE_MODIFY) &&
+            change->flags.generic == 0 ) {
+        Debug( LDAP_DEBUG_ANY, "lload_handle_invalidation: "
+                "a modify where apparently nothing changed\n" );
+    }
+
+    switch ( change->object ) {
+        case LLOAD_BACKEND:
+            lload_handle_backend_invalidation( change );
+            break;
+        case LLOAD_DAEMON:
+            lload_handle_global_invalidation( change );
+            break;
+        default:
+            Debug( LDAP_DEBUG_ANY, "lload_handle_invalidation: "
+                    "unrecognised change\n" );
+            assert(0);
+    }
+
+    return LDAP_SUCCESS;
+}
+
+static void
+lload_pause_event_cb( evutil_socket_t s, short what, void *arg )
+{
+    /*
+     * We are pausing, signal the pausing thread we've finished and
+     * wait until the thread pool resumes operation.
+     *
+     * Do this in lockstep with the pausing thread.
+     */
+    checked_lock( &lload_wait_mutex );
+    ldap_pvt_thread_cond_signal( &lload_wait_cond );
+
+    /* Now wait until we unpause, then we can resume operation */
+    ldap_pvt_thread_cond_wait( &lload_pause_cond, &lload_wait_mutex );
+    checked_unlock( &lload_wait_mutex );
+}
+
+/*
+ * Signal the event base to terminate processing as soon as it can and wait for
+ * lload_pause_event_cb to notify us this has happened.
+ */
+static int
+lload_pause_base( struct event_base *base )
+{
+    int rc;
+
+    checked_lock( &lload_wait_mutex );
+    event_base_once( base, -1, EV_TIMEOUT, lload_pause_event_cb, base, NULL );
+    rc = ldap_pvt_thread_cond_wait( &lload_wait_cond, &lload_wait_mutex );
+    checked_unlock( &lload_wait_mutex );
+
+    return rc;
+}
+
+void
+lload_pause_server( void )
+{
+    LloadChange ch = { .type = LLOAD_CHANGE_UNDEFINED };
+    int i;
+
+    lload_pause_base( listener_base );
+    lload_pause_base( daemon_base );
+
+    for ( i = 0; i < lload_daemon_threads; i++ ) {
+        lload_pause_base( lload_daemon[i].base );
+    }
+
+    lload_change = ch;
+}
+
+void
+lload_unpause_server( void )
+{
+    if ( lload_change.type != LLOAD_CHANGE_UNDEFINED ) {
+        lload_handle_invalidation( &lload_change );
+    }
+
+    /*
+     * Make sure lloadd is completely ready to unpause by now:
+     *
+     * After the broadcast, we handle I/O and begin filling the thread pool, in
+     * high load conditions, we might hit the pool limits and start processing
+     * operations in the I/O threads (one PDU per socket at a time for fairness
+     * sake) even before a pause has finished from slapd's point of view!
+     *
+     * When (max_pdus_per_cycle == 0) we don't use the pool for these at all and
+     * most lload processing starts immediately making this even more prominent.
+     */
+    ldap_pvt_thread_cond_broadcast( &lload_pause_cond );
+}
+#endif /* BALANCER_MODULE */
+
+void
+lload_sig_shutdown( evutil_socket_t sig, short what, void *arg )
+{
+    struct event_base *daemon_base = arg;
+    int save_errno = errno;
+    int i;
+
+    /*
+     * If the NT Service Manager is controlling the server, we don't
+     * want SIGBREAK to kill the server. For some strange reason,
+     * SIGBREAK is generated when a user logs out.
+     */
+
+#if defined(HAVE_NT_SERVICE_MANAGER) && defined(SIGBREAK)
+    if ( is_NT_Service && sig == SIGBREAK ) {
+        /* empty */;
+    } else
+#endif /* HAVE_NT_SERVICE_MANAGER && SIGBREAK */
+#ifdef SIGHUP
+    if ( sig == SIGHUP && global_gentlehup && slapd_gentle_shutdown == 0 ) {
+        slapd_gentle_shutdown = 1;
+    } else
+#endif /* SIGHUP */
+    {
+        slapd_shutdown = 1;
+    }
+
+    for ( i = 0; i < lload_daemon_threads; i++ ) {
+        event_base_loopexit( lload_daemon[i].base, NULL );
+    }
+    event_base_loopexit( daemon_base, NULL );
+
+    errno = save_errno;
+}
+
+struct event_base *
+lload_get_base( ber_socket_t s )
+{
+    int tid = DAEMON_ID(s);
+    return lload_daemon[tid].base;
+}
+
+LloadListener **
+lloadd_get_listeners( void )
+{
+    /* Could return array with no listeners if !listening, but current
+     * callers mostly look at the URLs.  E.g. syncrepl uses this to
+     * identify the server, which means it wants the startup arguments.
+     */
+    return lload_listeners;
+}
+
+/* Reject all incoming requests */
+void
+lload_suspend_listeners( void )
+{
+    int i;
+    for ( i = 0; lload_listeners[i]; i++ ) {
+        lload_listeners[i]->sl_mute = 1;
+        evconnlistener_disable( lload_listeners[i]->listener );
+        listen( lload_listeners[i]->sl_sd, 0 );
+    }
+}
+
+/* Resume after a suspend */
+void
+lload_resume_listeners( void )
+{
+    int i;
+    for ( i = 0; lload_listeners[i]; i++ ) {
+        lload_listeners[i]->sl_mute = 0;
+        listen( lload_listeners[i]->sl_sd, SLAPD_LISTEN_BACKLOG );
+        evconnlistener_enable( lload_listeners[i]->listener );
+    }
+}