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daemon.c

/* $OpenLDAP: pkg/ldap/servers/slapd/daemon.c,v 1.380.2.12 2008/05/27 20:12:44 quanah Exp $ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1998-2008 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 "slap.h"
#include "ldap_pvt_thread.h"
#include "lutil.h"

#include "ldap_rq.h"

#if defined(HAVE_SYS_EPOLL_H) && defined(HAVE_EPOLL)
# include <sys/epoll.h>
#elif defined(SLAP_X_DEVPOLL) && defined(HAVE_SYS_DEVPOLL_H) && defined(HAVE_DEVPOLL)
# include <sys/types.h>
# include <sys/stat.h>
# include <fcntl.h>
# include <sys/devpoll.h>
#endif /* ! epoll && ! /dev/poll */

#ifdef HAVE_TCPD
int allow_severity = LOG_INFO;
int deny_severity = LOG_NOTICE;
#endif /* TCP Wrappers */

#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 */

#ifdef LDAP_PF_INET6
int slap_inet4or6 = AF_UNSPEC;
#else /* ! INETv6 */
int slap_inet4or6 = AF_INET;
#endif /* ! INETv6 */

/* globals */
time_t starttime;
ber_socket_t dtblsize;
slap_ssf_t local_ssf = LDAP_PVT_SASL_LOCAL_SSF;
struct runqueue_s slapd_rq;

Listener **slap_listeners = NULL;

#ifndef SLAPD_LISTEN_BACKLOG
#define SLAPD_LISTEN_BACKLOG 1024
#endif /* ! SLAPD_LISTEN_BACKLOG */

static ber_socket_t wake_sds[2];
static int emfile;

static volatile int waking;
#ifdef NO_THREADS
#define WAKE_LISTENER(w)      do { \
      if ((w) && ++waking < 5) { \
            tcp_write( SLAP_FD2SOCK(wake_sds[1]), "0", 1 ); \
      } \
} while (0)
#else /* ! NO_THREADS */
#define WAKE_LISTENER(w)      do { \
      if (w) { \
            tcp_write( SLAP_FD2SOCK(wake_sds[1]), "0", 1 ); \
      } \
} while (0)
#endif /* ! NO_THREADS */

volatile sig_atomic_t slapd_shutdown = 0;
volatile sig_atomic_t slapd_gentle_shutdown = 0;
volatile sig_atomic_t slapd_abrupt_shutdown = 0;

#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

static struct slap_daemon {
      ldap_pvt_thread_mutex_t sd_mutex;
#ifdef HAVE_TCPD
      ldap_pvt_thread_mutex_t sd_tcpd_mutex;
#endif /* TCP Wrappers */

      ber_socket_t            sd_nactives;
      int               sd_nwriters;
      int               sd_nfds;

#if defined(HAVE_EPOLL)
      struct epoll_event      *sd_epolls;
      int               *sd_index;
      int               sd_epfd;
#elif defined(SLAP_X_DEVPOLL) && defined(HAVE_DEVPOLL)
      /* eXperimental */
      struct pollfd           *sd_pollfd;
      int               *sd_index;
      Listener          **sd_l;
      int               sd_dpfd;
#else /* ! epoll && ! /dev/poll */
#ifdef HAVE_WINSOCK
      char  *sd_flags;
      char  *sd_rflags;
#else /* ! HAVE_WINSOCK */
      fd_set                  sd_actives;
      fd_set                  sd_readers;
      fd_set                  sd_writers;
#endif /* ! HAVE_WINSOCK */
#endif /* ! epoll && ! /dev/poll */
} slap_daemon;

/*
 * NOTE: naming convention for macros:
 *
 * - SLAP_SOCK_* and SLAP_EVENT_* for public interface that deals
 *   with file descriptors and events respectively
 *
 * - SLAP_<type>_* for private interface; type by now is one of
 *   EPOLL, DEVPOLL, SELECT
 *
 * private interface should not be used in the code.
 */
#if defined(HAVE_EPOLL)
/***************************************
 * Use epoll infrastructure - epoll(4) *
 ***************************************/
# define SLAP_EVENT_FNAME           "epoll"
# define SLAP_EVENTS_ARE_INDEXED    0
# define SLAP_EPOLL_SOCK_IX(s)            (slap_daemon.sd_index[(s)])
# define SLAP_EPOLL_SOCK_EP(s)            (slap_daemon.sd_epolls[SLAP_EPOLL_SOCK_IX(s)])
# define SLAP_EPOLL_SOCK_EV(s)            (SLAP_EPOLL_SOCK_EP(s).events)
# define SLAP_SOCK_IS_ACTIVE(s)           (SLAP_EPOLL_SOCK_IX(s) != -1)
# define SLAP_SOCK_NOT_ACTIVE(s)    (SLAP_EPOLL_SOCK_IX(s) == -1)
# define SLAP_EPOLL_SOCK_IS_SET(s, mode)  (SLAP_EPOLL_SOCK_EV(s) & (mode))

# define SLAP_SOCK_IS_READ(s)       SLAP_EPOLL_SOCK_IS_SET((s), EPOLLIN)
# define SLAP_SOCK_IS_WRITE(s)            SLAP_EPOLL_SOCK_IS_SET((s), EPOLLOUT)

# define SLAP_EPOLL_SOCK_SET(s, mode)     do { \
      if ( (SLAP_EPOLL_SOCK_EV(s) & (mode)) != (mode) ) {   \
            SLAP_EPOLL_SOCK_EV(s) |= (mode); \
            epoll_ctl( slap_daemon.sd_epfd, EPOLL_CTL_MOD, (s), \
                  &SLAP_EPOLL_SOCK_EP(s) ); \
      } \
} while (0)

# define SLAP_EPOLL_SOCK_CLR(s, mode)     do { \
      if ( (SLAP_EPOLL_SOCK_EV(s) & (mode)) ) { \
            SLAP_EPOLL_SOCK_EV(s) &= ~(mode);   \
            epoll_ctl( slap_daemon.sd_epfd, EPOLL_CTL_MOD, s, \
                  &SLAP_EPOLL_SOCK_EP(s) ); \
      } \
} while (0)

# define SLAP_SOCK_SET_READ(s)            SLAP_EPOLL_SOCK_SET(s, EPOLLIN)
# define SLAP_SOCK_SET_WRITE(s)           SLAP_EPOLL_SOCK_SET(s, EPOLLOUT)

# define SLAP_SOCK_CLR_READ(s)            SLAP_EPOLL_SOCK_CLR((s), EPOLLIN)
# define SLAP_SOCK_CLR_WRITE(s)           SLAP_EPOLL_SOCK_CLR((s), EPOLLOUT)

#  define SLAP_SOCK_SET_SUSPEND(s) \
      ( slap_daemon.sd_suspend[SLAP_EPOLL_SOCK_IX(s)] = 1 )
#  define SLAP_SOCK_CLR_SUSPEND(s) \
      ( slap_daemon.sd_suspend[SLAP_EPOLL_SOCK_IX(s)] = 0 )
#  define SLAP_SOCK_IS_SUSPEND(s) \
      ( slap_daemon.sd_suspend[SLAP_EPOLL_SOCK_IX(s)] == 1 )

# define SLAP_EPOLL_EVENT_CLR(i, mode)    (revents[(i)].events &= ~(mode))

# define SLAP_EVENT_MAX             slap_daemon.sd_nfds

/* If a Listener address is provided, store that as the epoll data.
 * Otherwise, store the address of this socket's slot in the
 * index array. If we can't do this add, the system is out of
 * resources and we need to shutdown.
 */
# define SLAP_SOCK_ADD(s, l)        do { \
      int rc; \
      SLAP_EPOLL_SOCK_IX((s)) = slap_daemon.sd_nfds; \
      SLAP_EPOLL_SOCK_EP((s)).data.ptr = (l) ? (l) : (void *)(&SLAP_EPOLL_SOCK_IX(s)); \
      SLAP_EPOLL_SOCK_EV((s)) = EPOLLIN; \
      rc = epoll_ctl(slap_daemon.sd_epfd, EPOLL_CTL_ADD, \
            (s), &SLAP_EPOLL_SOCK_EP((s))); \
      if ( rc == 0 ) { \
            slap_daemon.sd_nfds++; \
      } else { \
            Debug( LDAP_DEBUG_ANY, \
                  "daemon: epoll_ctl(ADD,fd=%d) failed, errno=%d, shutting down\n", \
                  s, errno, 0 ); \
            slapd_shutdown = 2; \
      } \
} while (0)

# define SLAP_EPOLL_EV_LISTENER(ptr) \
      (((int *)(ptr) >= slap_daemon.sd_index && \
      (int *)(ptr) <= &slap_daemon.sd_index[dtblsize]) ? 0 : 1 )

# define SLAP_EPOLL_EV_PTRFD(ptr)         (SLAP_EPOLL_EV_LISTENER(ptr) ? \
      ((Listener *)ptr)->sl_sd : \
      (ber_socket_t) ((int *)(ptr) - slap_daemon.sd_index))

# define SLAP_SOCK_DEL(s)           do { \
      int fd, rc, index = SLAP_EPOLL_SOCK_IX((s)); \
      if ( index < 0 ) break; \
      rc = epoll_ctl(slap_daemon.sd_epfd, EPOLL_CTL_DEL, \
            (s), &SLAP_EPOLL_SOCK_EP((s))); \
      slap_daemon.sd_epolls[index] = \
            slap_daemon.sd_epolls[slap_daemon.sd_nfds-1]; \
      fd = SLAP_EPOLL_EV_PTRFD(slap_daemon.sd_epolls[index].data.ptr); \
      slap_daemon.sd_index[fd] = index; \
      slap_daemon.sd_index[(s)] = -1; \
      slap_daemon.sd_nfds--; \
} while (0)

# define SLAP_EVENT_CLR_READ(i)           SLAP_EPOLL_EVENT_CLR((i), EPOLLIN)
# define SLAP_EVENT_CLR_WRITE(i)    SLAP_EPOLL_EVENT_CLR((i), EPOLLOUT)

# define SLAP_EPOLL_EVENT_CHK(i, mode)    (revents[(i)].events & mode)

# define SLAP_EVENT_IS_READ(i)            SLAP_EPOLL_EVENT_CHK((i), EPOLLIN)
# define SLAP_EVENT_IS_WRITE(i)           SLAP_EPOLL_EVENT_CHK((i), EPOLLOUT)
# define SLAP_EVENT_IS_LISTENER(i)  SLAP_EPOLL_EV_LISTENER(revents[(i)].data.ptr)
# define SLAP_EVENT_LISTENER(i)           ((Listener *)(revents[(i)].data.ptr))

# define SLAP_EVENT_FD(i)           SLAP_EPOLL_EV_PTRFD(revents[(i)].data.ptr)

# define SLAP_SOCK_INIT       do { \
      slap_daemon.sd_epolls = ch_calloc(1, \
            ( sizeof(struct epoll_event) * 2 \
                  + sizeof(int) ) * dtblsize * 2); \
      slap_daemon.sd_index = (int *)&slap_daemon.sd_epolls[ 2 * dtblsize ]; \
      slap_daemon.sd_epfd = epoll_create( dtblsize ); \
      for ( i = 0; i < dtblsize; i++ ) slap_daemon.sd_index[i] = -1; \
} while (0)

# define SLAP_SOCK_DESTROY          do { \
      if ( slap_daemon.sd_epolls != NULL ) { \
            ch_free( slap_daemon.sd_epolls ); \
            slap_daemon.sd_epolls = NULL; \
            slap_daemon.sd_index = NULL; \
            close( slap_daemon.sd_epfd ); \
      } \
} while ( 0 )

# define SLAP_EVENT_DECL            struct epoll_event *revents

# define SLAP_EVENT_INIT            do { \
      revents = slap_daemon.sd_epolls + dtblsize; \
} while (0)

# define SLAP_EVENT_WAIT(tvp, nsp)  do { \
      *(nsp) = epoll_wait( slap_daemon.sd_epfd, revents, \
            dtblsize, (tvp) ? (tvp)->tv_sec * 1000 : -1 ); \
} while (0)

#elif defined(SLAP_X_DEVPOLL) && defined(HAVE_DEVPOLL)

/*************************************************************
 * Use Solaris' (>= 2.7) /dev/poll infrastructure - poll(7d) *
 *************************************************************/
# define SLAP_EVENT_FNAME           "/dev/poll"
# define SLAP_EVENTS_ARE_INDEXED    0
/*
 * - sd_index     is used much like with epoll()
 * - sd_l   is maintained as an array containing the address
 *          of the listener; the index is the fd itself
 * - sd_pollfd    is used to keep track of what data has been
 *          registered in /dev/poll
 */
# define SLAP_DEVPOLL_SOCK_IX(s)    (slap_daemon.sd_index[(s)])
# define SLAP_DEVPOLL_SOCK_LX(s)    (slap_daemon.sd_l[(s)])
# define SLAP_DEVPOLL_SOCK_EP(s)    (slap_daemon.sd_pollfd[SLAP_DEVPOLL_SOCK_IX((s))])
# define SLAP_DEVPOLL_SOCK_FD(s)    (SLAP_DEVPOLL_SOCK_EP((s)).fd)
# define SLAP_DEVPOLL_SOCK_EV(s)    (SLAP_DEVPOLL_SOCK_EP((s)).events)
# define SLAP_SOCK_IS_ACTIVE(s)           (SLAP_DEVPOLL_SOCK_IX((s)) != -1)
# define SLAP_SOCK_NOT_ACTIVE(s)    (SLAP_DEVPOLL_SOCK_IX((s)) == -1)
# define SLAP_SOCK_IS_SET(s, mode)  (SLAP_DEVPOLL_SOCK_EV((s)) & (mode))

# define SLAP_SOCK_IS_READ(s)       SLAP_SOCK_IS_SET((s), POLLIN)
# define SLAP_SOCK_IS_WRITE(s)            SLAP_SOCK_IS_SET((s), POLLOUT)

/* as far as I understand, any time we need to communicate with the kernel
 * about the number and/or properties of a file descriptor we need it to
 * wait for, we have to rewrite the whole set */
# define SLAP_DEVPOLL_WRITE_POLLFD(s, pfd, n, what, shdn)   do { \
      int rc; \
      size_t size = (n) * sizeof( struct pollfd ); \
      /* FIXME: use pwrite? */ \
      rc = write( slap_daemon.sd_dpfd, (pfd), size ); \
      if ( rc != size ) { \
            Debug( LDAP_DEBUG_ANY, "daemon: " SLAP_EVENT_FNAME ": " \
                  "%s fd=%d failed errno=%d\n", \
                  (what), (s), errno ); \
            if ( (shdn) ) { \
                  slapd_shutdown = 2; \
            } \
      } \
} while (0)

# define SLAP_DEVPOLL_SOCK_SET(s, mode)   do { \
      Debug( LDAP_DEBUG_CONNS, "SLAP_SOCK_SET_%s(%d)=%d\n", \
            (mode) == POLLIN ? "READ" : "WRITE", (s), \
            ( (SLAP_DEVPOLL_SOCK_EV((s)) & (mode)) != (mode) ) ); \
      if ( (SLAP_DEVPOLL_SOCK_EV((s)) & (mode)) != (mode) ) { \
            struct pollfd pfd; \
            SLAP_DEVPOLL_SOCK_EV((s)) |= (mode); \
            pfd.fd = SLAP_DEVPOLL_SOCK_FD((s)); \
            pfd.events = /* (mode) */ SLAP_DEVPOLL_SOCK_EV((s)); \
            SLAP_DEVPOLL_WRITE_POLLFD((s), &pfd, 1, "SET", 0); \
      } \
} while (0)

# define SLAP_DEVPOLL_SOCK_CLR(s, mode)         do { \
      Debug( LDAP_DEBUG_CONNS, "SLAP_SOCK_CLR_%s(%d)=%d\n", \
            (mode) == POLLIN ? "READ" : "WRITE", (s), \
            ( (SLAP_DEVPOLL_SOCK_EV((s)) & (mode)) == (mode) ) ); \
      if ((SLAP_DEVPOLL_SOCK_EV((s)) & (mode)) == (mode) ) { \
            struct pollfd pfd[2]; \
            SLAP_DEVPOLL_SOCK_EV((s)) &= ~(mode); \
            pfd[0].fd = SLAP_DEVPOLL_SOCK_FD((s)); \
            pfd[0].events = POLLREMOVE; \
            pfd[1] = SLAP_DEVPOLL_SOCK_EP((s)); \
            SLAP_DEVPOLL_WRITE_POLLFD((s), &pfd[0], 2, "CLR", 0); \
      } \
} while (0)

# define SLAP_SOCK_SET_READ(s)            SLAP_DEVPOLL_SOCK_SET(s, POLLIN)
# define SLAP_SOCK_SET_WRITE(s)           SLAP_DEVPOLL_SOCK_SET(s, POLLOUT)

# define SLAP_SOCK_CLR_READ(s)            SLAP_DEVPOLL_SOCK_CLR((s), POLLIN)
# define SLAP_SOCK_CLR_WRITE(s)           SLAP_DEVPOLL_SOCK_CLR((s), POLLOUT)

#  define SLAP_SOCK_SET_SUSPEND(s) \
      ( slap_daemon.sd_suspend[SLAP_DEVPOLL_SOCK_IX((s))] = 1 )
#  define SLAP_SOCK_CLR_SUSPEND(s) \
      ( slap_daemon.sd_suspend[SLAP_DEVPOLL_SOCK_IX((s))] = 0 )
#  define SLAP_SOCK_IS_SUSPEND(s) \
      ( slap_daemon.sd_suspend[SLAP_DEVPOLL_SOCK_IX((s))] == 1 )

# define SLAP_DEVPOLL_EVENT_CLR(i, mode)  (revents[(i)].events &= ~(mode))

# define SLAP_EVENT_MAX             slap_daemon.sd_nfds

/* If a Listener address is provided, store that in the sd_l array.
 * If we can't do this add, the system is out of resources and we 
 * need to shutdown.
 */
# define SLAP_SOCK_ADD(s, l)        do { \
      Debug( LDAP_DEBUG_CONNS, "SLAP_SOCK_ADD(%d, %p)\n", (s), (l), 0 ); \
      SLAP_DEVPOLL_SOCK_IX((s)) = slap_daemon.sd_nfds; \
      SLAP_DEVPOLL_SOCK_LX((s)) = (l); \
      SLAP_DEVPOLL_SOCK_FD((s)) = (s); \
      SLAP_DEVPOLL_SOCK_EV((s)) = POLLIN; \
      SLAP_DEVPOLL_WRITE_POLLFD((s), &SLAP_DEVPOLL_SOCK_EP((s)), 1, "ADD", 1); \
      slap_daemon.sd_nfds++; \
} while (0)

# define SLAP_DEVPOLL_EV_LISTENER(ptr)    ((ptr) != NULL)

# define SLAP_SOCK_DEL(s)           do { \
      int fd, index = SLAP_DEVPOLL_SOCK_IX((s)); \
      Debug( LDAP_DEBUG_CONNS, "SLAP_SOCK_DEL(%d)\n", (s), 0, 0 ); \
      if ( index < 0 ) break; \
      if ( index < slap_daemon.sd_nfds - 1 ) { \
            struct pollfd pfd = slap_daemon.sd_pollfd[index]; \
            fd = slap_daemon.sd_pollfd[slap_daemon.sd_nfds - 1].fd; \
            slap_daemon.sd_pollfd[index] = slap_daemon.sd_pollfd[slap_daemon.sd_nfds - 1]; \
            slap_daemon.sd_pollfd[slap_daemon.sd_nfds - 1] = pfd; \
            slap_daemon.sd_index[fd] = index; \
      } \
      slap_daemon.sd_index[(s)] = -1; \
      slap_daemon.sd_pollfd[slap_daemon.sd_nfds - 1].events = POLLREMOVE; \
      SLAP_DEVPOLL_WRITE_POLLFD((s), &slap_daemon.sd_pollfd[slap_daemon.sd_nfds - 1], 1, "DEL", 0); \
      slap_daemon.sd_pollfd[slap_daemon.sd_nfds - 1].events = 0; \
      slap_daemon.sd_nfds--; \
} while (0)

# define SLAP_EVENT_CLR_READ(i)           SLAP_DEVPOLL_EVENT_CLR((i), POLLIN)
# define SLAP_EVENT_CLR_WRITE(i)    SLAP_DEVPOLL_EVENT_CLR((i), POLLOUT)

# define SLAP_DEVPOLL_EVENT_CHK(i, mode)  (revents[(i)].events & (mode))

# define SLAP_EVENT_FD(i)           (revents[(i)].fd)

# define SLAP_EVENT_IS_READ(i)            SLAP_DEVPOLL_EVENT_CHK((i), POLLIN)
# define SLAP_EVENT_IS_WRITE(i)           SLAP_DEVPOLL_EVENT_CHK((i), POLLOUT)
# define SLAP_EVENT_IS_LISTENER(i)  SLAP_DEVPOLL_EV_LISTENER(SLAP_DEVPOLL_SOCK_LX(SLAP_EVENT_FD((i))))
# define SLAP_EVENT_LISTENER(i)           SLAP_DEVPOLL_SOCK_LX(SLAP_EVENT_FD((i)))

# define SLAP_SOCK_INIT       do { \
      slap_daemon.sd_pollfd = ch_calloc( 1, \
            ( sizeof(struct pollfd) * 2 \
                  + sizeof( int ) \
                  + sizeof( Listener * ) ) * dtblsize ); \
      slap_daemon.sd_index = (int *)&slap_daemon.sd_pollfd[ 2 * dtblsize ]; \
      slap_daemon.sd_l = (Listener **)&slap_daemon.sd_index[ dtblsize ]; \
      slap_daemon.sd_dpfd = open( SLAP_EVENT_FNAME, O_RDWR ); \
      if ( slap_daemon.sd_dpfd == -1 ) { \
            Debug( LDAP_DEBUG_ANY, "daemon: " SLAP_EVENT_FNAME ": " \
                  "open(\"" SLAP_EVENT_FNAME "\") failed errno=%d\n", \
                  errno, 0, 0 ); \
            SLAP_SOCK_DESTROY; \
            return -1; \
      } \
      for ( i = 0; i < dtblsize; i++ ) { \
            slap_daemon.sd_pollfd[i].fd = -1; \
            slap_daemon.sd_index[i] = -1; \
      } \
} while (0)

# define SLAP_SOCK_DESTROY          do { \
      if ( slap_daemon.sd_pollfd != NULL ) { \
            ch_free( slap_daemon.sd_pollfd ); \
            slap_daemon.sd_pollfd = NULL; \
            slap_daemon.sd_index = NULL; \
            slap_daemon.sd_l = NULL; \
            close( slap_daemon.sd_dpfd ); \
      } \
} while ( 0 )

# define SLAP_EVENT_DECL            struct pollfd *revents

# define SLAP_EVENT_INIT            do { \
      revents = &slap_daemon.sd_pollfd[ dtblsize ]; \
} while (0)

# define SLAP_EVENT_WAIT(tvp, nsp)  do { \
      struct dvpoll           sd_dvpoll; \
      sd_dvpoll.dp_timeout = (tvp) ? (tvp)->tv_sec * 1000 : -1; \
      sd_dvpoll.dp_nfds = dtblsize; \
      sd_dvpoll.dp_fds = revents; \
      *(nsp) = ioctl( slap_daemon.sd_dpfd, DP_POLL, &sd_dvpoll ); \
} while (0)

#else /* ! epoll && ! /dev/poll */
# ifdef HAVE_WINSOCK
# define SLAP_EVENT_FNAME           "WSselect"
/* Winsock provides a "select" function but its fd_sets are
 * actually arrays of sockets. Since these sockets are handles
 * and not a contiguous range of small integers, we manage our
 * own "fd" table of socket handles and use their indices as
 * descriptors.
 *
 * All of our listener/connection structures use fds; the actual
 * I/O functions use sockets. The SLAP_FD2SOCK macro in proto-slap.h
 * handles the mapping.
 *
 * Despite the mapping overhead, this is about 45% more efficient
 * than just using Winsock's select and FD_ISSET directly.
 *
 * Unfortunately Winsock's select implementation doesn't scale well
 * as the number of connections increases. This probably needs to be
 * rewritten to use the Winsock overlapped/asynchronous I/O functions.
 */
# define SLAP_EVENTS_ARE_INDEXED    1
# define SLAP_EVENT_DECL            fd_set readfds, writefds
# define SLAP_EVENT_INIT      do { \
      int i; \
      FD_ZERO( &readfds ); \
      FD_ZERO( &writefds ); \
      memset( slap_daemon.sd_rflags, 0, slap_daemon.sd_nfds ); \
      for ( i=0; i<slap_daemon.sd_nfds; i++ ) { \
            if ( slap_daemon.sd_flags[i] & SD_READ ) \
                  FD_SET( slapd_ws_sockets[i], &readfds );\
            if ( slap_daemon.sd_flags[i] & SD_WRITE ) \
                  FD_SET( slapd_ws_sockets[i], &writefds ); \
      } } while ( 0 )

# define SLAP_EVENT_MAX       slap_daemon.sd_nfds

# define SLAP_EVENT_WAIT(tvp, nsp)  do { \
      int i; \
      *(nsp) = select( SLAP_EVENT_MAX, &readfds, \
            nwriters > 0 ? &writefds : NULL, NULL, (tvp) ); \
      for ( i=0; i<readfds.fd_count; i++) { \
            int fd = slapd_sock2fd(readfds.fd_array[i]); \
            if ( fd >= 0 ) { \
                  slap_daemon.sd_rflags[fd] = SD_READ; \
                  if ( fd >= *(nsp)) *(nsp) = fd+1; \
            } \
      } \
      for ( i=0; i<writefds.fd_count; i++) { \
            int fd = slapd_sock2fd(writefds.fd_array[i]); \
            if ( fd >= 0 ) { \
                  slap_daemon.sd_rflags[fd] = SD_WRITE; \
                  if ( fd >= *(nsp)) *(nsp) = fd+1; \
            } \
      } \
} while (0)

# define SLAP_EVENT_IS_READ(fd)           (slap_daemon.sd_rflags[fd] & SD_READ)
# define SLAP_EVENT_IS_WRITE(fd)    (slap_daemon.sd_rflags[fd] & SD_WRITE)

# define SLAP_EVENT_CLR_READ(fd)    slap_daemon.sd_rflags[fd] &= ~SD_READ;
# define SLAP_EVENT_CLR_WRITE(fd)   slap_daemon.sd_rflags[fd] &= ~SD_WRITE;

# define SLAP_SOCK_INIT       do { \
      ldap_pvt_thread_mutex_init( &slapd_ws_mutex ); \
      slapd_ws_sockets = ch_malloc( dtblsize * ( sizeof(SOCKET) + 2)); \
      slap_daemon.sd_flags = (char *)(slapd_ws_sockets + dtblsize); \
      slap_daemon.sd_rflags = slap_daemon.sd_flags + dtblsize; \
      memset( slapd_ws_sockets, -1, dtblsize * sizeof(SOCKET) ); \
      slapd_ws_sockets[0] = wake_sds[0]; \
      slapd_ws_sockets[1] = wake_sds[1]; \
      wake_sds[0] = 0; \
      wake_sds[1] = 1; \
      slap_daemon.sd_nfds = 2; \
      } while ( 0 )

# define SLAP_SOCK_DESTROY    do { \
      ch_free( slapd_ws_sockets ); slapd_ws_sockets = NULL; \
      slap_daemon.sd_flags = NULL; \
      slap_daemon.sd_rflags = NULL; \
      ldap_pvt_thread_mutex_destroy( &slapd_ws_mutex ); \
      } while ( 0 )

# define SLAP_SOCK_IS_ACTIVE(fd) ( slap_daemon.sd_flags[fd] & SD_ACTIVE )
# define SLAP_SOCK_IS_READ(fd) ( slap_daemon.sd_flags[fd] & SD_READ )
# define SLAP_SOCK_IS_WRITE(fd) ( slap_daemon.sd_flags[fd] & SD_WRITE )
# define SLAP_SOCK_NOT_ACTIVE(fd)   (!slap_daemon.sd_flags[fd])

# define SLAP_SOCK_SET_READ(fd)           ( slap_daemon.sd_flags[fd] |= SD_READ )
# define SLAP_SOCK_SET_WRITE(fd)          ( slap_daemon.sd_flags[fd] |= SD_WRITE )

# define SLAP_SELECT_ADDTEST(s)     do { \
      if ((s) >= slap_daemon.sd_nfds) slap_daemon.sd_nfds = (s)+1; \
} while (0)

# define SLAP_SOCK_CLR_READ(fd)           ( slap_daemon.sd_flags[fd] &= ~SD_READ )
# define SLAP_SOCK_CLR_WRITE(fd)          ( slap_daemon.sd_flags[fd] &= ~SD_WRITE )

# define SLAP_SOCK_ADD(s, l)  do { \
      SLAP_SELECT_ADDTEST((s)); \
      slap_daemon.sd_flags[s] = SD_ACTIVE|SD_READ; \
} while ( 0 )

# define SLAP_SOCK_DEL(s) do { \
      slap_daemon.sd_flags[s] = 0; \
      slapd_sockdel( s ); \
} while ( 0 )

# else /* !HAVE_WINSOCK */

/**************************************
 * Use select system call - select(2) *
 **************************************/
# define SLAP_EVENT_FNAME           "select"
/* select */
# define SLAP_EVENTS_ARE_INDEXED    1
# define SLAP_EVENT_DECL            fd_set readfds, writefds

# define SLAP_EVENT_INIT            do { \
      AC_MEMCPY( &readfds, &slap_daemon.sd_readers, sizeof(fd_set) );   \
      if ( nwriters )   { \
            AC_MEMCPY( &writefds, &slap_daemon.sd_writers, sizeof(fd_set) ); \
      } else { \
            FD_ZERO( &writefds ); \
      } \
} while (0)

# ifdef FD_SETSIZE
#  define SLAP_SELECT_CHK_SETSIZE   do { \
      if (dtblsize > FD_SETSIZE) dtblsize = FD_SETSIZE; \
} while (0)
# else /* ! FD_SETSIZE */
#  define SLAP_SELECT_CHK_SETSIZE   do { ; } while (0)
# endif /* ! FD_SETSIZE */

# define SLAP_SOCK_INIT             do { \
      SLAP_SELECT_CHK_SETSIZE; \
      FD_ZERO(&slap_daemon.sd_actives); \
      FD_ZERO(&slap_daemon.sd_readers); \
      FD_ZERO(&slap_daemon.sd_writers); \
} while (0)

# define SLAP_SOCK_DESTROY

# define SLAP_SOCK_IS_ACTIVE(fd)    FD_ISSET((fd), &slap_daemon.sd_actives)
# define SLAP_SOCK_IS_READ(fd)            FD_ISSET((fd), &slap_daemon.sd_readers)
# define SLAP_SOCK_IS_WRITE(fd)           FD_ISSET((fd), &slap_daemon.sd_writers)

# define SLAP_SOCK_NOT_ACTIVE(fd)   (!SLAP_SOCK_IS_ACTIVE(fd) && \
       !SLAP_SOCK_IS_READ(fd) && !SLAP_SOCK_IS_WRITE(fd))

# define SLAP_SOCK_SET_READ(fd)     FD_SET((fd), &slap_daemon.sd_readers)
# define SLAP_SOCK_SET_WRITE(fd)    FD_SET((fd), &slap_daemon.sd_writers)

# define SLAP_EVENT_MAX       slap_daemon.sd_nfds
# define SLAP_SELECT_ADDTEST(s)     do { \
      if ((s) >= slap_daemon.sd_nfds) slap_daemon.sd_nfds = (s)+1; \
} while (0)

# define SLAP_SOCK_CLR_READ(fd)           FD_CLR((fd), &slap_daemon.sd_readers)
# define SLAP_SOCK_CLR_WRITE(fd)    FD_CLR((fd), &slap_daemon.sd_writers)

# define SLAP_SOCK_ADD(s, l)        do { \
      SLAP_SELECT_ADDTEST((s)); \
      FD_SET((s), &slap_daemon.sd_actives); \
      FD_SET((s), &slap_daemon.sd_readers); \
} while (0)

# define SLAP_SOCK_DEL(s)           do { \
      FD_CLR((s), &slap_daemon.sd_actives); \
      FD_CLR((s), &slap_daemon.sd_readers); \
      FD_CLR((s), &slap_daemon.sd_writers); \
} while (0)

# define SLAP_EVENT_IS_READ(fd)           FD_ISSET((fd), &readfds)
# define SLAP_EVENT_IS_WRITE(fd)    FD_ISSET((fd), &writefds)

# define SLAP_EVENT_CLR_READ(fd)    FD_CLR((fd), &readfds)
# define SLAP_EVENT_CLR_WRITE(fd)   FD_CLR((fd), &writefds)

# define SLAP_EVENT_WAIT(tvp, nsp)  do { \
      *(nsp) = select( SLAP_EVENT_MAX, &readfds, \
            nwriters > 0 ? &writefds : NULL, NULL, (tvp) ); \
} while (0)
# endif /* !HAVE_WINSOCK */
#endif /* ! epoll && ! /dev/poll */

#ifdef HAVE_SLP
/*
 * SLP related functions
 */
#include <slp.h>

#define LDAP_SRVTYPE_PREFIX "service:ldap://"
#define LDAPS_SRVTYPE_PREFIX "service:ldaps://"
static char** slapd_srvurls = NULL;
static SLPHandle slapd_hslp = 0;
int slapd_register_slp = 0;
const char *slapd_slp_attrs = NULL;

static SLPError slapd_slp_cookie;

static void
slapd_slp_init( const char* urls )
{
      int i;
      SLPError err;

      slapd_srvurls = ldap_str2charray( urls, " " );

      if ( slapd_srvurls == NULL ) return;

      /* find and expand INADDR_ANY URLs */
      for ( i = 0; slapd_srvurls[i] != NULL; i++ ) {
            if ( strcmp( slapd_srvurls[i], "ldap:///" ) == 0 ) {
                  slapd_srvurls[i] = (char *) ch_realloc( slapd_srvurls[i],
                        strlen( global_host ) +
                        sizeof( LDAP_SRVTYPE_PREFIX ) );
                  strcpy( lutil_strcopy(slapd_srvurls[i],
                        LDAP_SRVTYPE_PREFIX ), global_host );
            } else if ( strcmp( slapd_srvurls[i], "ldaps:///" ) == 0 ) {
                  slapd_srvurls[i] = (char *) ch_realloc( slapd_srvurls[i],
                        strlen( global_host ) +
                        sizeof( LDAPS_SRVTYPE_PREFIX ) );
                  strcpy( lutil_strcopy(slapd_srvurls[i],
                        LDAPS_SRVTYPE_PREFIX ), global_host );
            }
      }

      /* open the SLP handle */
      err = SLPOpen( "en", 0, &slapd_hslp );

      if ( err != SLP_OK ) {
            Debug( LDAP_DEBUG_CONNS, "daemon: SLPOpen() failed with %ld\n",
                  (long)err, 0, 0 );
      }
}

static void
slapd_slp_deinit( void )
{
      if ( slapd_srvurls == NULL ) return;

      ldap_charray_free( slapd_srvurls );
      slapd_srvurls = NULL;

      /* close the SLP handle */
      SLPClose( slapd_hslp );
}

static void
slapd_slp_regreport(
      SLPHandle   hslp,
      SLPError    errcode,
      void        *cookie )
{
      /* return the error code in the cookie */
      *(SLPError*)cookie = errcode; 
}

static void
slapd_slp_reg()
{
      int i;
      SLPError err;

      if ( slapd_srvurls == NULL ) return;

      for ( i = 0; slapd_srvurls[i] != NULL; i++ ) {
            if ( strncmp( slapd_srvurls[i], LDAP_SRVTYPE_PREFIX,
                        sizeof( LDAP_SRVTYPE_PREFIX ) - 1 ) == 0 ||
                  strncmp( slapd_srvurls[i], LDAPS_SRVTYPE_PREFIX,
                        sizeof( LDAPS_SRVTYPE_PREFIX ) - 1 ) == 0 )
            {
                  err = SLPReg( slapd_hslp,
                        slapd_srvurls[i],
                        SLP_LIFETIME_MAXIMUM,
                        "ldap",
                        (slapd_slp_attrs) ? slapd_slp_attrs : "",
                        SLP_TRUE,
                        slapd_slp_regreport,
                        &slapd_slp_cookie );

                  if ( err != SLP_OK || slapd_slp_cookie != SLP_OK ) {
                        Debug( LDAP_DEBUG_CONNS,
                              "daemon: SLPReg(%s) failed with %ld, cookie = %ld\n",
                              slapd_srvurls[i], (long)err, (long)slapd_slp_cookie );
                  }     
            }
      }
}

static void
slapd_slp_dereg( void )
{
      int i;
      SLPError err;

      if ( slapd_srvurls == NULL ) return;

      for ( i = 0; slapd_srvurls[i] != NULL; i++ ) {
            err = SLPDereg( slapd_hslp,
                  slapd_srvurls[i],
                  slapd_slp_regreport,
                  &slapd_slp_cookie );
            
            if ( err != SLP_OK || slapd_slp_cookie != SLP_OK ) {
                  Debug( LDAP_DEBUG_CONNS,
                        "daemon: SLPDereg(%s) failed with %ld, cookie = %ld\n",
                        slapd_srvurls[i], (long)err, (long)slapd_slp_cookie );
            }
      }
}
#endif /* HAVE_SLP */

#ifdef HAVE_WINSOCK
/* Manage the descriptor to socket table */
ber_socket_t
slapd_socknew( ber_socket_t s )
{
      ber_socket_t i;
      ldap_pvt_thread_mutex_lock( &slapd_ws_mutex );
      for ( i = 0; i < dtblsize && slapd_ws_sockets[i] != INVALID_SOCKET; i++ );
      if ( i == dtblsize ) {
            WSASetLastError( WSAEMFILE );
      } else {
            slapd_ws_sockets[i] = s;
      }
      ldap_pvt_thread_mutex_unlock( &slapd_ws_mutex );
      return i;
}

void
slapd_sockdel( ber_socket_t s )
{
      ldap_pvt_thread_mutex_lock( &slapd_ws_mutex );
      slapd_ws_sockets[s] = INVALID_SOCKET;
      ldap_pvt_thread_mutex_unlock( &slapd_ws_mutex );
}

ber_socket_t
slapd_sock2fd( ber_socket_t s )
{
      ber_socket_t i;
      for ( i=0; i<dtblsize && slapd_ws_sockets[i] != s; i++);
      if ( i == dtblsize )
            i = -1;
      return i;
}
#endif

/*
 * Add a descriptor to daemon control
 *
 * If isactive, the descriptor is a live server session and is subject
 * to idletimeout control. Otherwise, the descriptor is a passive
 * listener or an outbound client session, and not subject to
 * idletimeout. The underlying event handler may record the Listener
 * argument to differentiate Listener's from real sessions.
 */
static void
slapd_add( ber_socket_t s, int isactive, Listener *sl )
{
      ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );

      assert( SLAP_SOCK_NOT_ACTIVE(s) );

      if ( isactive ) slap_daemon.sd_nactives++;

      SLAP_SOCK_ADD(s, sl);

      Debug( LDAP_DEBUG_CONNS, "daemon: added %ldr%s listener=%p\n",
            (long) s, isactive ? " (active)" : "", (void *)sl );

      ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );

      WAKE_LISTENER(1);
}

/*
 * NOTE: unused
 */
void
slapd_sd_lock( void )
{
      ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );
}

/*
 * NOTE: unused
 */
void
slapd_sd_unlock( void )
{
      ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
}

/*
 * Remove the descriptor from daemon control
 */
void
slapd_remove(
      ber_socket_t s,
      Sockbuf *sb,
      int wasactive,
      int wake,
      int locked )
{
      int waswriter;
      int wasreader;

      if ( !locked )
            ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );

      assert( SLAP_SOCK_IS_ACTIVE( s ));

      if ( wasactive ) slap_daemon.sd_nactives--;

      waswriter = SLAP_SOCK_IS_WRITE(s);
      wasreader = SLAP_SOCK_IS_READ(s);

      Debug( LDAP_DEBUG_CONNS, "daemon: removing %ld%s%s\n",
            (long) s,
            wasreader ? "r" : "",
            waswriter ? "w" : "" );

      if ( waswriter ) slap_daemon.sd_nwriters--;

      SLAP_SOCK_DEL(s);

      if ( sb )
            ber_sockbuf_free(sb);

      /* If we ran out of file descriptors, we dropped a listener from
       * the select() loop. Now that we're removing a session from our
       * control, we can try to resume a dropped listener to use.
       */
      if ( emfile ) {
            int i;
            for ( i = 0; slap_listeners[i] != NULL; i++ ) {
                  Listener *lr = slap_listeners[i];

                  if ( lr->sl_sd == AC_SOCKET_INVALID ) continue;
                  if ( lr->sl_sd == s ) continue;
                  if ( lr->sl_mute ) {
                        lr->sl_mute = 0;
                        emfile--;
                        break;
                  }
            }
            /* Walked the entire list without enabling anything; emfile
             * counter is stale. Reset it.
             */
            if ( slap_listeners[i] == NULL ) emfile = 0;
      }
      ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
      WAKE_LISTENER(wake || slapd_gentle_shutdown == 2);
}

void
slapd_clr_write( ber_socket_t s, int wake )
{
      ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );

      if ( SLAP_SOCK_IS_WRITE( s )) {
            assert( SLAP_SOCK_IS_ACTIVE( s ));

            SLAP_SOCK_CLR_WRITE( s );
            slap_daemon.sd_nwriters--;
      }

      ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
      WAKE_LISTENER(wake);
}

void
slapd_set_write( ber_socket_t s, int wake )
{
      ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );

      assert( SLAP_SOCK_IS_ACTIVE( s ));

      if ( !SLAP_SOCK_IS_WRITE( s )) {
            SLAP_SOCK_SET_WRITE( s );
            slap_daemon.sd_nwriters++;
      }

      ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
      WAKE_LISTENER(wake);
}

int
slapd_clr_read( ber_socket_t s, int wake )
{
      int rc = 1;
      ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );

      if ( SLAP_SOCK_IS_ACTIVE( s )) {
            SLAP_SOCK_CLR_READ( s );
            rc = 0;
      }
      ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
      if ( !rc )
            WAKE_LISTENER(wake);
      return rc;
}

void
slapd_set_read( ber_socket_t s, int wake )
{
      ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );

      assert( SLAP_SOCK_IS_ACTIVE( s ));
      if (!SLAP_SOCK_IS_READ( s )) SLAP_SOCK_SET_READ( s );

      ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
      WAKE_LISTENER(wake);
}

static void
slapd_close( ber_socket_t s )
{
      Debug( LDAP_DEBUG_CONNS, "daemon: closing %ld\n",
            (long) s, 0, 0 );
      tcp_close( SLAP_FD2SOCK(s) );
#ifdef HAVE_WINSOCK
      slapd_sockdel( s );
#endif
}

static void
slap_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
slap_get_listener_addresses(
      const char *host,
      unsigned short port,
      struct sockaddr ***sal )
{
      struct sockaddr **sap;

#ifdef LDAP_PF_LOCAL
      if ( port == 0 ) {
            *sal = ch_malloc(2 * sizeof(void *));
            if (*sal == NULL) return -1;

            sap = *sal;
            *sap = ch_malloc(sizeof(struct sockaddr_un));
            if (*sap == NULL) goto errexit;
            sap[1] = NULL;

            if ( strlen(host) >
                  (sizeof(((struct sockaddr_un *)*sap)->sun_path) - 1) )
            {
                  Debug( LDAP_DEBUG_ANY,
                        "daemon: domain socket path (%s) too long in URL",
                        host, 0, 0);
                  goto errexit;
            }

            (void)memset( (void *)*sap, '\0', sizeof(struct sockaddr_un) );
            (*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, "daemon: getaddrinfo() failed: %s\n",
                        AC_GAI_STRERROR(err), 0, 0);
                  return -1;
            }

            sai = res;
            for (n=2; (sai = sai->ai_next) != NULL; n++) {
                  /* EMPTY */ ;
            }
            *sal = ch_calloc(n, sizeof(void *));
            if (*sal == NULL) return -1;

            sap = *sal;
            *sap = NULL;

            for ( sai=res; sai; sai=sai->ai_next ) {
                  if( sai->ai_addr == NULL ) {
                        Debug( LDAP_DEBUG_ANY, "slap_get_listener_addresses: "
                              "getaddrinfo ai_addr is NULL?\n", 0, 0, 0 );
                        freeaddrinfo(res);
                        goto errexit;
                  }

                  switch (sai->ai_family) {
#  ifdef LDAP_PF_INET6
                  case AF_INET6:
                        *sap = ch_malloc(sizeof(struct sockaddr_in6));
                        if (*sap == NULL) {
                              freeaddrinfo(res);
                              goto errexit;
                        }
                        *(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));
                        if (*sap == NULL) {
                              freeaddrinfo(res);
                              goto errexit;
                        }
                        *(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,
                              "daemon: invalid host %s", host, 0, 0);
                        return -1;
                  }
                  for (n = 0; he->h_addr_list[n]; n++) /* empty */;
            }

            *sal = ch_malloc((n+1) * sizeof(void *));
            if (*sal == NULL) return -1;

            sap = *sal;
            for ( i = 0; i<n; i++ ) {
                  sap[i] = ch_malloc(sizeof(struct sockaddr_in));
                  if (*sap == NULL) goto errexit;

                  (void)memset( (void *)sap[i], '\0', 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:
      slap_free_listener_addresses(*sal);
      return -1;
}

static int
slap_open_listener(
      const char* url,
      int *listeners,
      int *cur )
{
      int   num, tmp, rc;
      Listener l;
      Listener *li;
      LDAPURLDesc *lud;
      unsigned short port;
      int err, addrlen = 0;
      struct sockaddr **sal, **psal;
      int socktype = SOCK_STREAM;   /* default to COTS */
      ber_socket_t s;

#if defined(LDAP_PF_LOCAL) || defined(SLAP_X_LISTENER_MOD)
      /*
       * use safe defaults
       */
      int   crit = 1;
#endif /* LDAP_PF_LOCAL || SLAP_X_LISTENER_MOD */

      rc = ldap_url_parse( url, &lud );

      if( rc != LDAP_URL_SUCCESS ) {
            Debug( LDAP_DEBUG_ANY,
                  "daemon: listen URL \"%s\" parse error=%d\n",
                  url, rc, 0 );
            return rc;
      }

      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, "daemon: TLS not supported (%s)\n",
                  url, 0, 0 );
            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 );

      if(! lud->lud_port ) {
            lud->lud_port = l.sl_is_tls ? LDAPS_PORT : LDAP_PORT;
      }
#endif /* HAVE_TLS */

      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 = slap_get_listener_addresses(LDAPI_SOCK, 0, &sal);
            } else {
                  err = slap_get_listener_addresses(lud->lud_host, 0, &sal);
            }
#else /* ! LDAP_PF_LOCAL */

            Debug( LDAP_DEBUG_ANY, "daemon: URL scheme not supported: %s",
                  url, 0, 0);
            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 = slap_get_listener_addresses(NULL, port, &sal);
            } else {
                  err = slap_get_listener_addresses(lud->lud_host, port, &sal);
            }
      }

#ifdef LDAP_CONNECTIONLESS
      l.sl_is_udp = ( tmp == LDAP_PROTO_UDP );
#endif /* LDAP_CONNECTIONLESS */

#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 ) return -1;

      /* If we got more than one address returned, we need to make space
       * for it in the slap_listeners array.
       */
      for ( num=0; sal[num]; num++ ) /* empty */;
      if ( num > 1 ) {
            *listeners += num-1;
            slap_listeners = ch_realloc( slap_listeners,
                  (*listeners + 1) * sizeof(Listener *) );
      }

      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;
            }

#ifdef LDAP_CONNECTIONLESS
            if( l.sl_is_udp ) socktype = SOCK_DGRAM;
#endif /* LDAP_CONNECTIONLESS */

            s = socket( (*sal)->sa_family, socktype, 0);
            if ( s == AC_SOCKET_INVALID ) {
                  int err = sock_errno();
                  Debug( LDAP_DEBUG_ANY,
                        "daemon: %s socket() failed errno=%d (%s)\n",
                        af, err, sock_errstr(err) );
                  sal++;
                  continue;
            }
            l.sl_sd = SLAP_SOCKNEW( s );

            if ( l.sl_sd >= dtblsize ) {
                  Debug( LDAP_DEBUG_ANY,
                        "daemon: listener descriptor %ld is too great %ld\n",
                        (long) l.sl_sd, (long) dtblsize, 0 );
                  tcp_close( s );
                  sal++;
                  continue;
            }

#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, "slapd(%ld): "
                              "setsockopt(SO_REUSEADDR) failed errno=%d (%s)\n",
                              (long) l.sl_sd, err, sock_errstr(err) );
                  }
#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, "slapd(%ld): "
                              "setsockopt(IPV6_V6ONLY) failed errno=%d (%s)\n",
                              (long) l.sl_sd, err, sock_errstr(err) );
                  }
#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;

                  if ( (*sal)->sa_family == AF_LOCAL ) {
                        old_umask = umask( 0 );
                  }
#endif /* LDAP_PF_LOCAL */
                  rc = bind( s, *sal, addrlen );
#ifdef LDAP_PF_LOCAL
                  if ( (*sal)->sa_family == AF_LOCAL ) {
                        umask( old_umask );
                  }
            }
#endif /* LDAP_PF_LOCAL */
            if ( rc ) {
                  err = sock_errno();
                  Debug( LDAP_DEBUG_ANY,
                        "daemon: bind(%ld) failed errno=%d (%s)\n",
                        (long)l.sl_sd, err, sock_errstr( err ) );
                  tcp_close( s );
                  sal++;
                  continue;
            }

            switch ( (*sal)->sa_family ) {
#ifdef LDAP_PF_LOCAL
            case AF_LOCAL: {
                  char *addr = ((struct sockaddr_un *)*sal)->sun_path;
                  l.sl_name.bv_len = strlen(addr) + sizeof("PATH=") - 1;
                  l.sl_name.bv_val = ber_memalloc( l.sl_name.bv_len + 1 );
                  snprintf( l.sl_name.bv_val, l.sl_name.bv_len + 1, 
                        "PATH=%s", addr );
            } break;
#endif /* LDAP_PF_LOCAL */

            case AF_INET: {
                  char *s;
#if defined( HAVE_GETADDRINFO ) && defined( HAVE_INET_NTOP )
                  char addr[INET_ADDRSTRLEN];
                  inet_ntop( AF_INET, &((struct sockaddr_in *)*sal)->sin_addr,
                        addr, sizeof(addr) );
                  s = addr;
#else /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */
                  s = inet_ntoa( ((struct sockaddr_in *) *sal)->sin_addr );
#endif /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */
                  port = ntohs( ((struct sockaddr_in *)*sal) ->sin_port );
                  l.sl_name.bv_val =
                        ber_memalloc( sizeof("IP=255.255.255.255:65535") );
                  snprintf( l.sl_name.bv_val, sizeof("IP=255.255.255.255:65535"),
                        "IP=%s:%d",
                         s != NULL ? s : SLAP_STRING_UNKNOWN, port );
                  l.sl_name.bv_len = strlen( l.sl_name.bv_val );
            } break;

#ifdef LDAP_PF_INET6
            case AF_INET6: {
                  char addr[INET6_ADDRSTRLEN];
                  inet_ntop( AF_INET6, &((struct sockaddr_in6 *)*sal)->sin6_addr,
                        addr, sizeof addr);
                  port = ntohs( ((struct sockaddr_in6 *)*sal)->sin6_port );
                  l.sl_name.bv_len = strlen(addr) + sizeof("IP=[]:65535");
                  l.sl_name.bv_val = ber_memalloc( l.sl_name.bv_len );
                  snprintf( l.sl_name.bv_val, l.sl_name.bv_len, "IP=[%s]:%d", 
                        addr, port );
                  l.sl_name.bv_len = strlen( l.sl_name.bv_val );
            } break;
#endif /* LDAP_PF_INET6 */

            default:
                  Debug( LDAP_DEBUG_ANY, "daemon: unsupported address family (%d)\n",
                        (int) (*sal)->sa_family, 0, 0 );
                  break;
            }

            AC_MEMCPY(&l.sl_sa, *sal, addrlen);
            ber_str2bv( url, 0, 1, &l.sl_url);
            li = ch_malloc( sizeof( Listener ) );
            *li = l;
            slap_listeners[*cur] = li;
            (*cur)++;
            sal++;
      }

      slap_free_listener_addresses(psal);

      if ( l.sl_url.bv_val == NULL ) {
            Debug( LDAP_DEBUG_TRACE,
                  "slap_open_listener: failed on %s\n", url, 0, 0 );
            return -1;
      }

      Debug( LDAP_DEBUG_TRACE, "daemon: listener initialized %s\n",
            l.sl_url.bv_val, 0, 0 );
      return 0;
}

static int sockinit(void);
static int sockdestroy(void);

int
slapd_daemon_init( const char *urls )
{
      int i, j, n, rc;
      char **u;

      Debug( LDAP_DEBUG_ARGS, "daemon_init: %s\n",
            urls ? urls : "<null>", 0, 0 );

      ldap_pvt_thread_mutex_init( &slap_daemon.sd_mutex );
#ifdef HAVE_TCPD
      ldap_pvt_thread_mutex_init( &slap_daemon.sd_tcpd_mutex );
#endif /* TCP Wrappers */

      if( (rc = sockinit()) != 0 ) return rc;

#ifdef HAVE_SYSCONF
      dtblsize = sysconf( _SC_OPEN_MAX );
#elif defined(HAVE_GETDTABLESIZE)
      dtblsize = getdtablesize();
#else /* ! HAVE_SYSCONF && ! HAVE_GETDTABLESIZE */
      dtblsize = FD_SETSIZE;
#endif /* ! HAVE_SYSCONF && ! HAVE_GETDTABLESIZE */

      /* open a pipe (or something equivalent connected to itself).
       * we write a byte on this fd whenever we catch a signal. The main
       * loop will be select'ing on this socket, and will wake up when
       * this byte arrives.
       */
      if( (rc = lutil_pair( wake_sds )) < 0 ) {
            Debug( LDAP_DEBUG_ANY,
                  "daemon: lutil_pair() failed rc=%d\n", rc, 0, 0 );
            return rc;
      }

      SLAP_SOCK_INIT;

      if( urls == NULL ) urls = "ldap:///";

      u = ldap_str2charray( urls, " " );

      if( u == NULL || u[0] == NULL ) {
            Debug( LDAP_DEBUG_ANY, "daemon_init: no urls (%s) provided.\n",
                  urls, 0, 0 );
            if ( u )
                  ldap_charray_free( u );
            return -1;
      }

      for( i=0; u[i] != NULL; i++ ) {
            Debug( LDAP_DEBUG_TRACE, "daemon_init: listen on %s\n",
                  u[i], 0, 0 );
      }

      if( i == 0 ) {
            Debug( LDAP_DEBUG_ANY, "daemon_init: no listeners to open (%s)\n",
                  urls, 0, 0 );
            ldap_charray_free( u );
            return -1;
      }

      Debug( LDAP_DEBUG_TRACE, "daemon_init: %d listeners to open...\n",
            i, 0, 0 );
      slap_listeners = ch_malloc( (i+1)*sizeof(Listener *) );

      for(n = 0, j = 0; u[n]; n++ ) {
            if ( slap_open_listener( u[n], &i, &j ) ) {
                  ldap_charray_free( u );
                  return -1;
            }
      }
      slap_listeners[j] = NULL;

      Debug( LDAP_DEBUG_TRACE, "daemon_init: %d listeners opened\n",
            i, 0, 0 );


#ifdef HAVE_SLP
      if( slapd_register_slp ) {
            slapd_slp_init( urls );
            slapd_slp_reg();
      }
#endif /* HAVE_SLP */

      ldap_charray_free( u );

      return !i;
}


int
slapd_daemon_destroy( void )
{
      connections_destroy();
      tcp_close( SLAP_FD2SOCK(wake_sds[1]) );
      tcp_close( SLAP_FD2SOCK(wake_sds[0]) );
      sockdestroy();

#ifdef HAVE_SLP
      if( slapd_register_slp ) {
            slapd_slp_dereg();
            slapd_slp_deinit();
      }
#endif /* HAVE_SLP */

#ifdef HAVE_TCPD
      ldap_pvt_thread_mutex_destroy( &slap_daemon.sd_tcpd_mutex );
#endif /* TCP Wrappers */

      ldap_pvt_thread_mutex_destroy( &slap_daemon.sd_mutex );
      return 0;
}


static void
close_listeners(
      int remove )
{
      int l;

      for ( l = 0; slap_listeners[l] != NULL; l++ ) {
            Listener *lr = slap_listeners[l];

            if ( lr->sl_sd != AC_SOCKET_INVALID ) {
                  if ( remove ) slapd_remove( lr->sl_sd, NULL, 0, 0, 0 );

#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 */

                  slapd_close( lr->sl_sd );
            }

            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 );
            }

            free( lr );
            slap_listeners[l] = NULL;
      }
}

static int
slap_listener(
      Listener *sl )
{
      Sockaddr          from;

      ber_socket_t s, sfd;
      ber_socklen_t len = sizeof(from);
      Connection *c;
      slap_ssf_t ssf = 0;
      struct berval authid = BER_BVNULL;
#ifdef SLAPD_RLOOKUPS
      char hbuf[NI_MAXHOST];
#endif /* SLAPD_RLOOKUPS */

      char  *dnsname = NULL;
      char  *peeraddr = NULL;
#ifdef LDAP_PF_LOCAL
      char peername[MAXPATHLEN + sizeof("PATH=")];
#ifdef LDAP_PF_LOCAL_SENDMSG
      char peerbuf[8];
      struct berval peerbv = BER_BVNULL;
#endif
#elif defined(LDAP_PF_INET6)
      char peername[sizeof("IP=[ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff]:65535")];
#else /* ! LDAP_PF_LOCAL && ! LDAP_PF_INET6 */
      char peername[sizeof("IP=255.255.255.255:65336")];
#endif /* LDAP_PF_LOCAL */
      int cflag;

      Debug( LDAP_DEBUG_TRACE,
            ">>> slap_listener(%s)\n",
            sl->sl_url.bv_val, 0, 0 );

      peername[0] = '\0';

#ifdef LDAP_CONNECTIONLESS
      if ( sl->sl_is_udp ) return 1;
#endif /* LDAP_CONNECTIONLESS */

#  ifdef LDAP_PF_LOCAL
      /* FIXME: apparently accept doesn't fill
       * the sun_path sun_path member */
      from.sa_un_addr.sun_path[0] = '\0';
#  endif /* LDAP_PF_LOCAL */

      s = accept( SLAP_FD2SOCK( sl->sl_sd ), (struct sockaddr *) &from, &len );

      /* Resume the listener FD to allow concurrent-processing of
       * additional incoming connections.
       */
      sl->sl_busy = 0;
      WAKE_LISTENER(1);

      if ( s == AC_SOCKET_INVALID ) {
            int err = sock_errno();

            if(
#ifdef EMFILE
                err == EMFILE ||
#endif /* EMFILE */
#ifdef ENFILE
                err == ENFILE ||
#endif /* ENFILE */
                0 )
            {
                  ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );
                  emfile++;
                  /* Stop listening until an existing session closes */
                  sl->sl_mute = 1;
                  ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
            }

            Debug( LDAP_DEBUG_ANY,
                  "daemon: accept(%ld) failed errno=%d (%s)\n",
                  (long) sl->sl_sd, err, sock_errstr(err) );
            ldap_pvt_thread_yield();
            return 0;
      }
      sfd = SLAP_SOCKNEW( s );

      /* make sure descriptor number isn't too great */
      if ( sfd >= dtblsize ) {
            Debug( LDAP_DEBUG_ANY,
                  "daemon: %ld beyond descriptor table size %ld\n",
                  (long) sfd, (long) dtblsize, 0 );

            tcp_close(s);
            ldap_pvt_thread_yield();
            return 0;
      }

#ifdef LDAP_DEBUG
      ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );
      /* newly accepted stream should not be in any of the FD SETS */
      assert( SLAP_SOCK_NOT_ACTIVE( sfd ));
      ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
#endif /* LDAP_DEBUG */

#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,
                        "slapd(%ld): setsockopt(SO_KEEPALIVE) failed "
                        "errno=%d (%s)\n", (long) sfd, err, sock_errstr(err) );
            }
#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,
                        "slapd(%ld): setsockopt(TCP_NODELAY) failed "
                        "errno=%d (%s)\n", (long) sfd, err, sock_errstr(err) );
            }
#endif /* TCP_NODELAY */
      }
#endif /* SO_KEEPALIVE || TCP_NODELAY */

      Debug( LDAP_DEBUG_CONNS,
            "daemon: listen=%ld, new connection on %ld\n",
            (long) sl->sl_sd, (long) sfd, 0 );

      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 sun_path member */
            if ( from.sa_un_addr.sun_path[0] == '\0' ) {
                  AC_MEMCPY( from.sa_un_addr.sun_path,
                              sl->sl_sa.sa_un_addr.sun_path,
                              sizeof( from.sa_un_addr.sun_path ) );
            }

            sprintf( peername, "PATH=%s", from.sa_un_addr.sun_path );
            ssf = local_ssf;
            {
                  uid_t uid;
                  gid_t gid;

#ifdef LDAP_PF_LOCAL_SENDMSG
                  peerbv.bv_val = peerbuf;
                  peerbv.bv_len = sizeof( peerbuf );
#endif
                  if( LUTIL_GETPEEREID( s, &uid, &gid, &peerbv ) == 0 ) {
                        authid.bv_val = ch_malloc(
                              STRLENOF( "gidNumber=4294967295+uidNumber=4294967295,"
                              "cn=peercred,cn=external,cn=auth" ) + 1 );
                        authid.bv_len = sprintf( authid.bv_val,
                              "gidNumber=%d+uidNumber=%d,"
                              "cn=peercred,cn=external,cn=auth",
                              (int) gid, (int) uid );
                        assert( authid.bv_len <=
                              STRLENOF( "gidNumber=4294967295+uidNumber=4294967295,"
                              "cn=peercred,cn=external,cn=auth" ) );
                  }
            }
            dnsname = "local";
            break;
#endif /* LDAP_PF_LOCAL */

#  ifdef LDAP_PF_INET6
      case AF_INET6:
      if ( IN6_IS_ADDR_V4MAPPED(&from.sa_in6_addr.sin6_addr) ) {
            peeraddr = inet_ntoa( *((struct in_addr *)
                              &from.sa_in6_addr.sin6_addr.s6_addr[12]) );
            sprintf( peername, "IP=%s:%d",
                   peeraddr != NULL ? peeraddr : SLAP_STRING_UNKNOWN,
                   (unsigned) ntohs( from.sa_in6_addr.sin6_port ) );
      } else {
            char addr[INET6_ADDRSTRLEN];

            peeraddr = (char *) inet_ntop( AF_INET6,
                              &from.sa_in6_addr.sin6_addr,
                              addr, sizeof addr );
            sprintf( peername, "IP=[%s]:%d",
                   peeraddr != NULL ? peeraddr : SLAP_STRING_UNKNOWN,
                   (unsigned) ntohs( from.sa_in6_addr.sin6_port ) );
      }
      break;
#  endif /* LDAP_PF_INET6 */

      case AF_INET:
            peeraddr = inet_ntoa( from.sa_in_addr.sin_addr );
            sprintf( peername, "IP=%s:%d",
                  peeraddr != NULL ? peeraddr : SLAP_STRING_UNKNOWN,
                  (unsigned) ntohs( from.sa_in_addr.sin_port ) );
            break;

      default:
            slapd_close(sfd);
            return 0;
      }

      if ( ( from.sa_addr.sa_family == AF_INET )
#ifdef LDAP_PF_INET6
            || ( from.sa_addr.sa_family == AF_INET6 )
#endif /* LDAP_PF_INET6 */
            )
      {
            dnsname = NULL;
#ifdef SLAPD_RLOOKUPS
            if ( use_reverse_lookup ) {
                  char *herr;
                  if (ldap_pvt_get_hname( (const struct sockaddr *)&from, len, hbuf,
                        sizeof(hbuf), &herr ) == 0) {
                        ldap_pvt_str2lower( hbuf );
                        dnsname = hbuf;
                  }
            }
#endif /* SLAPD_RLOOKUPS */

#ifdef HAVE_TCPD
            {
                  int rc;
                  ldap_pvt_thread_mutex_lock( &slap_daemon.sd_tcpd_mutex );
                  rc = hosts_ctl("slapd",
                        dnsname != NULL ? dnsname : SLAP_STRING_UNKNOWN,
                        peeraddr != NULL ? peeraddr : SLAP_STRING_UNKNOWN,
                        SLAP_STRING_UNKNOWN );
                  ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_tcpd_mutex );
                  if ( !rc ) {
                        /* DENY ACCESS */
                        Statslog( LDAP_DEBUG_STATS,
                              "fd=%ld DENIED from %s (%s)\n",
                              (long) sfd,
                              dnsname != NULL ? dnsname : SLAP_STRING_UNKNOWN,
                              peeraddr != NULL ? peeraddr : SLAP_STRING_UNKNOWN,
                              0, 0 );
                        slapd_close(sfd);
                        return 0;
                  }
            }
#endif /* HAVE_TCPD */
      }

#ifdef HAVE_TLS
      if ( sl->sl_is_tls ) cflag |= CONN_IS_TLS;
#endif
      c = connection_init(sfd, sl,
            dnsname != NULL ? dnsname : SLAP_STRING_UNKNOWN,
            peername, cflag, ssf,
            authid.bv_val ? &authid : NULL
            LDAP_PF_LOCAL_SENDMSG_ARG(&peerbv));

      if( authid.bv_val ) ch_free(authid.bv_val);

      if( !c ) {
            Debug( LDAP_DEBUG_ANY,
                  "daemon: connection_init(%ld, %s, %s) failed.\n",
                  (long) sfd, peername, sl->sl_name.bv_val );
            slapd_close(sfd);
            return 0;
      }

      Statslog( LDAP_DEBUG_STATS,
            "conn=%ld fd=%ld ACCEPT from %s (%s)\n",
            c->c_connid, (long) sfd, peername, sl->sl_name.bv_val,
            0 );

      return 0;
}

static void*
slap_listener_thread(
      void* ctx,
      void* ptr )
{
      int         rc;
      Listener    *sl = (Listener *)ptr;

      rc = slap_listener( sl );

      if( rc != LDAP_SUCCESS ) {
            Debug( LDAP_DEBUG_ANY,
                  "slap_listener_thread(%s): failed err=%d",
                  sl->sl_url.bv_val, rc, 0 );
      }

      return (void*)NULL;
}

static int
slap_listener_activate(
      Listener* sl )
{
      int rc;

      Debug( LDAP_DEBUG_TRACE, "slap_listener_activate(%d): %s\n",
            sl->sl_sd, sl->sl_busy ? "busy" : "", 0 );

      sl->sl_busy++;

      rc = ldap_pvt_thread_pool_submit( &connection_pool,
            slap_listener_thread, (void *) sl );

      if( rc != 0 ) {
            Debug( LDAP_DEBUG_ANY,
                  "listener_activate(%d): submit failed (%d)\n",
                  sl->sl_sd, rc, 0 );
      }
      return rc;
}

static void *
slapd_daemon_task(
      void *ptr )
{
      int l;
      time_t last_idle_check = 0;
      struct timeval idle;
      int ebadf = 0;

#define SLAPD_IDLE_CHECK_LIMIT 4

      if ( global_idletimeout > 0 ) {
            last_idle_check = slap_get_time();
            /* Set the select timeout.
             * Don't just truncate, preserve the fractions of
             * seconds to prevent sleeping for zero time.
             */
            idle.tv_sec = global_idletimeout / SLAPD_IDLE_CHECK_LIMIT;
            idle.tv_usec = global_idletimeout - \
                  ( idle.tv_sec * SLAPD_IDLE_CHECK_LIMIT );
            idle.tv_usec *= 1000000 / SLAPD_IDLE_CHECK_LIMIT;
      } else {
            idle.tv_sec = 0;
            idle.tv_usec = 0;
      }

      slapd_add( wake_sds[0], 0, NULL );

      for ( l = 0; slap_listeners[l] != NULL; l++ ) {
            if ( slap_listeners[l]->sl_sd == AC_SOCKET_INVALID ) continue;

#ifdef LDAP_CONNECTIONLESS
            /* Since this is connectionless, the data port is the
             * listening port. The listen() and accept() calls
             * are unnecessary.
             */
            if ( slap_listeners[l]->sl_is_udp )
                  continue;
#endif /* LDAP_CONNECTIONLESS */

            if ( listen( SLAP_FD2SOCK( slap_listeners[l]->sl_sd ), SLAPD_LISTEN_BACKLOG ) == -1 ) {
                  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 = slap_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 = slap_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,
                                          "daemon: Attempt to listen to 0.0.0.0 failed, "
                                          "already listening on ::, assuming IPv4 included\n",
                                          0, 0, 0 );
                                    slapd_close( slap_listeners[l]->sl_sd );
                                    slap_listeners[l]->sl_sd = AC_SOCKET_INVALID;
                                    continue;
                              }
                        }
                  }
#endif /* LDAP_PF_INET6 */
                  Debug( LDAP_DEBUG_ANY,
                        "daemon: listen(%s, 5) failed errno=%d (%s)\n",
                              slap_listeners[l]->sl_url.bv_val, err,
                              sock_errstr(err) );
                  return (void*)-1;
            }

            /* make the listening socket non-blocking */
            if ( ber_pvt_socket_set_nonblock( SLAP_FD2SOCK( slap_listeners[l]->sl_sd ), 1 ) < 0 ) {
                  Debug( LDAP_DEBUG_ANY, "slapd_daemon_task: "
                        "set nonblocking on a listening socket failed\n",
                        0, 0, 0 );
                  slapd_shutdown = 2;
                  return (void*)-1;
            }

            slapd_add( slap_listeners[l]->sl_sd, 0, slap_listeners[l] );
      }

#ifdef HAVE_NT_SERVICE_MANAGER
      if ( started_event != NULL ) {
            ldap_pvt_thread_cond_signal( &started_event );
      }
#endif /* HAVE_NT_SERVICE_MANAGER */

      /* initialization complete. Here comes the loop. */

      while ( !slapd_shutdown ) {
            ber_socket_t            i;
            int               ns, nwriters;
            int               at;
            ber_socket_t            nfds;
#if SLAP_EVENTS_ARE_INDEXED
            ber_socket_t            nrfds, nwfds;
#endif /* SLAP_EVENTS_ARE_INDEXED */
#define SLAPD_EBADF_LIMIT 16

            time_t                  now;

            SLAP_EVENT_DECL;

            struct timeval          tv;
            struct timeval          *tvp;

            struct timeval          cat;
            time_t                  tdelta = 1;
            struct re_s*            rtask;

            now = slap_get_time();

            if ( ( global_idletimeout > 0 ) &&
                  difftime( last_idle_check +
                        global_idletimeout/SLAPD_IDLE_CHECK_LIMIT, now ) < 0 )
            {
                  connections_timeout_idle( now );
                  last_idle_check = now;
            }
            tv = idle;

#ifdef SIGHUP
            if ( slapd_gentle_shutdown ) {
                  ber_socket_t active;

                  if ( slapd_gentle_shutdown == 1 ) {
                        BackendDB *be;
                        Debug( LDAP_DEBUG_ANY, "slapd gentle shutdown\n", 0, 0, 0 );
                        close_listeners( 1 );
                        frontendDB->be_restrictops |= SLAP_RESTRICT_OP_WRITES;
                        LDAP_STAILQ_FOREACH(be, &backendDB, be_next) {
                              be->be_restrictops |= SLAP_RESTRICT_OP_WRITES;
                        }
                        slapd_gentle_shutdown = 2;
                  }

                  ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );
                  active = slap_daemon.sd_nactives;
                  ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );
                  if ( active == 0 ) {
                        slapd_shutdown = 1;
                        break;
                  }
            }
#endif /* SIGHUP */
            at = 0;

            ldap_pvt_thread_mutex_lock( &slap_daemon.sd_mutex );

            nwriters = slap_daemon.sd_nwriters;

            for ( l = 0; slap_listeners[l] != NULL; l++ ) {
                  Listener *lr = slap_listeners[l];

                  if ( lr->sl_sd == AC_SOCKET_INVALID ) continue;

                  if ( lr->sl_mute || lr->sl_busy )
                  {
                        SLAP_SOCK_CLR_READ( lr->sl_sd );
                  } else {
                        SLAP_SOCK_SET_READ( lr->sl_sd );
                  }
            }

            SLAP_EVENT_INIT;

            nfds = SLAP_EVENT_MAX;

            if ( global_idletimeout && slap_daemon.sd_nactives ) at = 1;

            ldap_pvt_thread_mutex_unlock( &slap_daemon.sd_mutex );

            if ( at 
#if defined(HAVE_YIELDING_SELECT) || defined(NO_THREADS)
                  &&  ( tv.tv_sec || tv.tv_usec )
#endif /* HAVE_YIELDING_SELECT || NO_THREADS */
                  )
            {
                  tvp = &tv;
            } else {
                  tvp = NULL;
            }

            ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
            rtask = ldap_pvt_runqueue_next_sched( &slapd_rq, &cat );
            while ( rtask && cat.tv_sec && cat.tv_sec <= now ) {
                  if ( ldap_pvt_runqueue_isrunning( &slapd_rq, rtask )) {
                        ldap_pvt_runqueue_resched( &slapd_rq, rtask, 0 );
                  } else {
                        ldap_pvt_runqueue_runtask( &slapd_rq, rtask );
                        ldap_pvt_runqueue_resched( &slapd_rq, rtask, 0 );
                        ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
                        ldap_pvt_thread_pool_submit( &connection_pool,
                              rtask->routine, (void *) rtask );
                        ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
                  }
                  rtask = ldap_pvt_runqueue_next_sched( &slapd_rq, &cat );
            }
            ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );

            if ( rtask && cat.tv_sec ) {
                  /* NOTE: diff __should__ always be >= 0,
                   * AFAI understand; however (ITS#4872),
                   * time_t might be unsigned in some systems,
                   * while difftime() returns a double */
                  double diff = difftime( cat.tv_sec, now );
                  if ( diff <= 0 ) {
                        diff = tdelta;
                  }
                  if ( tvp == NULL || diff < tv.tv_sec ) {
                        tv.tv_sec = diff;
                        tv.tv_usec = 0;
                        tvp = &tv;
                  }
            }

            for ( l = 0; slap_listeners[l] != NULL; l++ ) {
                  Listener *lr = slap_listeners[l];

                  if ( lr->sl_sd == AC_SOCKET_INVALID ) {
                        continue;
                  }

                  if ( lr->sl_mute ) {
                        Debug( LDAP_DEBUG_CONNS,
                              "daemon: " SLAP_EVENT_FNAME ": "
                              "listen=%d muted\n",
                              lr->sl_sd, 0, 0 );
                        continue;
                  }

                  if ( lr->sl_busy ) {
                        Debug( LDAP_DEBUG_CONNS,
                              "daemon: " SLAP_EVENT_FNAME ": "
                              "listen=%d busy\n",
                              lr->sl_sd, 0, 0 );
                        continue;
                  }

                  Debug( LDAP_DEBUG_CONNS,
                        "daemon: " SLAP_EVENT_FNAME ": "
                        "listen=%d active_threads=%d tvp=%s\n",
                        lr->sl_sd, at, tvp == NULL ? "NULL" : "zero" );
            }

            SLAP_EVENT_WAIT( tvp, &ns );
            switch ( ns ) {
            case -1: {  /* failure - try again */
                        int err = sock_errno();

                        if ( err != EINTR ) {
                              ebadf++;

                              /* Don't log unless we got it twice in a row */
                              if ( !( ebadf & 1 ) ) {
                                    Debug( LDAP_DEBUG_ANY,
                                          "daemon: "
                                          SLAP_EVENT_FNAME
                                          "failed count %d "
                                          "err (%d): %s\n",
                                          ebadf, err,
                                          sock_errstr( err ) );
                              }
                              if ( ebadf >= SLAPD_EBADF_LIMIT ) {
                                    slapd_shutdown = 2;
                              }
                        }
                  }
                  continue;

            case 0:           /* timeout - let threads run */
                  ebadf = 0;
#ifndef HAVE_YIELDING_SELECT
                  Debug( LDAP_DEBUG_CONNS, "daemon: " SLAP_EVENT_FNAME
                        "timeout - yielding\n",
                        0, 0, 0 );

                  ldap_pvt_thread_yield();
#endif /* ! HAVE_YIELDING_SELECT */
                  continue;

            default:    /* something happened - deal with it */
                  if ( slapd_shutdown ) continue;

                  ebadf = 0;
                  Debug( LDAP_DEBUG_CONNS,
                        "daemon: activity on %d descriptor%s\n",
                        ns, ns != 1 ? "s" : "", 0 );
                  /* FALL THRU */
            }

#if SLAP_EVENTS_ARE_INDEXED
            if ( SLAP_EVENT_IS_READ( wake_sds[0] ) ) {
                  char c[BUFSIZ];
                  SLAP_EVENT_CLR_READ( wake_sds[0] );
                  waking = 0;
                  tcp_read( SLAP_FD2SOCK(wake_sds[0]), c, sizeof(c) );
                  Debug( LDAP_DEBUG_CONNS, "daemon: waked\n", 0, 0, 0 );
                  continue;
            }

            /* The event slot equals the descriptor number - this is
             * true for Unix select and poll. We treat Windows select
             * like this too, even though it's a kludge.
             */
            for ( l = 0; slap_listeners[l] != NULL; l++ ) {
                  int rc;

                  if ( ns <= 0 ) break;
                  if ( slap_listeners[l]->sl_sd == AC_SOCKET_INVALID ) continue;
#ifdef LDAP_CONNECTIONLESS
                  if ( slap_listeners[l]->sl_is_udp ) continue;
#endif /* LDAP_CONNECTIONLESS */
                  if ( !SLAP_EVENT_IS_READ( slap_listeners[l]->sl_sd ) ) continue;
                  
                  /* clear events */
                  SLAP_EVENT_CLR_READ( slap_listeners[l]->sl_sd );
                  SLAP_EVENT_CLR_WRITE( slap_listeners[l]->sl_sd );
                  ns--;

                  rc = slap_listener_activate( slap_listeners[l] );
            }

            /* bypass the following tests if no descriptors left */
            if ( ns <= 0 ) {
#ifndef HAVE_YIELDING_SELECT
                  ldap_pvt_thread_yield();
#endif /* HAVE_YIELDING_SELECT */
                  continue;
            }

            Debug( LDAP_DEBUG_CONNS, "daemon: activity on:", 0, 0, 0 );
            nrfds = 0;
            nwfds = 0;
            for ( i = 0; i < nfds; i++ ) {
                  int   r, w;

                  r = SLAP_EVENT_IS_READ( i );
                  /* writefds was not initialized if nwriters was zero */
                  w = nwriters ? SLAP_EVENT_IS_WRITE( i ) : 0;
                  if ( r || w ) {
                        Debug( LDAP_DEBUG_CONNS, " %d%s%s", i,
                            r ? "r" : "", w ? "w" : "" );
                        if ( r ) {
                              nrfds++;
                              ns--;
                        }
                        if ( w ) {
                              nwfds++;
                              ns--;
                        }
                  }
                  if ( ns <= 0 ) break;
            }
            Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );

            /* loop through the writers */
            for ( i = 0; nwfds > 0; i++ ) {
                  ber_socket_t wd;
                  if ( ! SLAP_EVENT_IS_WRITE( i ) ) continue;
                  wd = i;

                  SLAP_EVENT_CLR_WRITE( wd );
                  nwfds--;

                  Debug( LDAP_DEBUG_CONNS,
                        "daemon: write active on %d\n",
                        wd, 0, 0 );

                  /*
                   * NOTE: it is possible that the connection was closed
                   * and that the stream is now inactive.
                   * connection_write() must validate the stream is still
                   * active.
                   *
                   * ITS#4338: if the stream is invalid, there is no need to
                   * close it here. It has already been closed in connection.c.
                   */
                  if ( connection_write( wd ) < 0 ) {
                        if ( SLAP_EVENT_IS_READ( wd ) ) {
                              SLAP_EVENT_CLR_READ( (unsigned) wd );
                              nrfds--;
                        }
                  }
            }

            for ( i = 0; nrfds > 0; i++ ) {
                  ber_socket_t rd;
                  if ( ! SLAP_EVENT_IS_READ( i ) ) continue;
                  rd = i;
                  SLAP_EVENT_CLR_READ( rd );
                  nrfds--;

                  Debug ( LDAP_DEBUG_CONNS,
                        "daemon: read activity on %d\n", rd, 0, 0 );
                  /*
                   * NOTE: it is possible that the connection was closed
                   * and that the stream is now inactive.
                   * connection_read() must valid the stream is still
                   * active.
                   */

                  connection_read_activate( rd );
            }
#else /* !SLAP_EVENTS_ARE_INDEXED */
      /* FIXME */
      /* The events are returned in an arbitrary list. This is true
       * for /dev/poll, epoll and kqueue. In order to prioritize things
       * so that we can handle wake_sds first, listeners second, and then
       * all other connections last (as we do for select), we would need
       * to use multiple event handles and cascade them.
       *
       * That seems like a bit of hassle. So the wake_sds check has been
       * skipped. For epoll and kqueue we can associate arbitrary data with
       * an event, so we could use pointers to the listener structure
       * instead of just the file descriptor. For /dev/poll we have to
       * search the listeners array for a matching descriptor.
       *
       * We now handle wake events when we see them; they are not given
       * higher priority.
       */
#ifdef LDAP_DEBUG
            Debug( LDAP_DEBUG_CONNS, "daemon: activity on:", 0, 0, 0 );

            for ( i = 0; i < ns; i++ ) {
                  int   r, w, fd;

                  /* Don't log listener events */
                  if ( SLAP_EVENT_IS_LISTENER( i )
#ifdef LDAP_CONNECTIONLESS
                        && !( (SLAP_EVENT_LISTENER( i ))->sl_is_udp )
#endif /* LDAP_CONNECTIONLESS */
                        )
                  {
                        continue;
                  }

                  fd = SLAP_EVENT_FD( i );
                  /* Don't log internal wake events */
                  if ( fd == wake_sds[0] ) continue;

                  r = SLAP_EVENT_IS_READ( i );
                  w = SLAP_EVENT_IS_WRITE( i );
                  if ( r || w ) {
                        Debug( LDAP_DEBUG_CONNS, " %d%s%s", fd,
                            r ? "r" : "", w ? "w" : "" );
                  }
            }
            Debug( LDAP_DEBUG_CONNS, "\n", 0, 0, 0 );
#endif /* LDAP_DEBUG */

            for ( i = 0; i < ns; i++ ) {
                  int rc = 1, fd;

                  if ( SLAP_EVENT_IS_LISTENER( i ) ) {
                        rc = slap_listener_activate( SLAP_EVENT_LISTENER( i ) );
                  }

                  /* If we found a regular listener, rc is now zero, and we
                   * can skip the data portion. But if it was a UDP listener
                   * then rc is still 1, and we want to handle the data.
                   */
                  if ( rc ) {
                        fd = SLAP_EVENT_FD( i );

                        /* Handle wake events */
                        if ( fd == wake_sds[0] ) {
                              char c[BUFSIZ];
                              waking = 0;
                              tcp_read( SLAP_FD2SOCK(wake_sds[0]), c, sizeof(c) );
                              break;
                        }

                        if ( SLAP_EVENT_IS_WRITE( i ) ) {
                              Debug( LDAP_DEBUG_CONNS,
                                    "daemon: write active on %d\n",
                                    fd, 0, 0 );

                              SLAP_EVENT_CLR_WRITE( i );

                              /*
                               * NOTE: it is possible that the connection was closed
                               * and that the stream is now inactive.
                               * connection_write() must valid the stream is still
                               * active.
                               */
                              if ( connection_write( fd ) < 0 ) {
                                    continue;
                              }
                        }
                        /* If event is a read */
                        if ( SLAP_EVENT_IS_READ( i ) ) {
                              Debug( LDAP_DEBUG_CONNS,
                                    "daemon: read active on %d\n",
                                    fd, 0, 0 );

                              SLAP_EVENT_CLR_READ( i );
                              connection_read_activate( fd );
                        } else {
                              Debug( LDAP_DEBUG_CONNS,
                                    "daemon: hangup on %d\n", fd, 0, 0 );
                        }
                  }
            }
#endif      /* SLAP_EVENTS_ARE_INDEXED */

#ifndef HAVE_YIELDING_SELECT
            ldap_pvt_thread_yield();
#endif /* ! HAVE_YIELDING_SELECT */
      }

      if ( slapd_shutdown == 1 ) {
            Debug( LDAP_DEBUG_ANY,
                  "daemon: shutdown requested and initiated.\n",
                  0, 0, 0 );

      } else if ( slapd_shutdown == 2 ) {
#ifdef HAVE_NT_SERVICE_MANAGER
                  Debug( LDAP_DEBUG_ANY,
                         "daemon: shutdown initiated by Service Manager.\n",
                         0, 0, 0);
#else /* !HAVE_NT_SERVICE_MANAGER */
                  Debug( LDAP_DEBUG_ANY,
                         "daemon: abnormal condition, shutdown initiated.\n",
                         0, 0, 0 );
#endif /* !HAVE_NT_SERVICE_MANAGER */
      } else {
            Debug( LDAP_DEBUG_ANY,
                   "daemon: no active streams, shutdown initiated.\n",
                   0, 0, 0 );
      }

      if ( slapd_gentle_shutdown != 2 ) close_listeners ( 0 );

      if ( !slapd_gentle_shutdown ) {
            slapd_abrupt_shutdown = 1;
            connections_shutdown();
      }

      Debug( LDAP_DEBUG_ANY,
            "slapd shutdown: waiting for %d threads to terminate\n",
            ldap_pvt_thread_pool_backload( &connection_pool ), 0, 0 );
      ldap_pvt_thread_pool_destroy( &connection_pool, 1 );

      free( slap_listeners );
      slap_listeners = NULL;

      return NULL;
}


#ifdef LDAP_CONNECTIONLESS
static int
connectionless_init( void )
{
      int l;

      for ( l = 0; slap_listeners[l] != NULL; l++ ) {
            Listener *lr = slap_listeners[l];
            Connection *c;

            if ( !lr->sl_is_udp ) {
                  continue;
            }

            c = connection_init( lr->sl_sd, lr, "", "",
                  CONN_IS_UDP, (slap_ssf_t) 0, NULL
                  LDAP_PF_LOCAL_SENDMSG_ARG(NULL));

            if ( !c ) {
                  Debug( LDAP_DEBUG_TRACE,
                        "connectionless_init: failed on %s (%d)\n",
                        lr->sl_url, lr->sl_sd, 0 );
                  return -1;
            }
            lr->sl_is_udp++;
      }

      return 0;
}
#endif /* LDAP_CONNECTIONLESS */

int
slapd_daemon( void )
{
      int rc;

#ifdef LDAP_CONNECTIONLESS
      connectionless_init();
#endif /* LDAP_CONNECTIONLESS */

#define SLAPD_LISTENER_THREAD 1
#if defined( SLAPD_LISTENER_THREAD )
      {
            ldap_pvt_thread_t listener_tid;

            /* listener as a separate THREAD */
            rc = ldap_pvt_thread_create( &listener_tid,
                  0, slapd_daemon_task, NULL );

            if ( rc != 0 ) {
                  Debug( LDAP_DEBUG_ANY,
                  "listener ldap_pvt_thread_create failed (%d)\n", rc, 0, 0 );
                  return rc;
            }
 
            /* wait for the listener thread to complete */
            ldap_pvt_thread_join( listener_tid, (void *)NULL );
      }
#else /* ! SLAPD_LISTENER_THREAD */
      /* experimental code */
      slapd_daemon_task( NULL );
#endif /* ! SLAPD_LISTENER_THREAD */

      return 0;
}

static int
sockinit( void )
{
#if defined( HAVE_WINSOCK2 )
      WORD wVersionRequested;
      WSADATA wsaData;
      int err;

      wVersionRequested = MAKEWORD( 2, 0 );

      err = WSAStartup( wVersionRequested, &wsaData );
      if ( err != 0 ) {
            /* Tell the user that we couldn't find a usable */
            /* WinSock DLL.                            */
            return -1;
      }

      /* Confirm that the WinSock DLL supports 2.0.*/
      /* Note that if the DLL supports versions greater    */
      /* than 2.0 in addition to 2.0, it will still return */
      /* 2.0 in wVersion since that is the version we      */
      /* requested.                                  */

      if ( LOBYTE( wsaData.wVersion ) != 2 ||
            HIBYTE( wsaData.wVersion ) != 0 )
      {
          /* Tell the user that we couldn't find a usable */
          /* WinSock DLL.                            */
          WSACleanup();
          return -1;
      }

      /* The WinSock DLL is acceptable. Proceed. */
#elif defined( HAVE_WINSOCK )
      WSADATA wsaData;
      if ( WSAStartup( 0x0101, &wsaData ) != 0 ) return -1;
#endif /* ! HAVE_WINSOCK2 && ! HAVE_WINSOCK */

      return 0;
}

static int
sockdestroy( void )
{
#if defined( HAVE_WINSOCK2 ) || defined( HAVE_WINSOCK )
      WSACleanup();
#endif /* HAVE_WINSOCK2 || HAVE_WINSOCK */
      SLAP_SOCK_DESTROY;

      return 0;
}

RETSIGTYPE
slap_sig_shutdown( int sig )
{
#if 0
      Debug(LDAP_DEBUG_TRACE, "slap_sig_shutdown: signal %d\n", sig, 0, 0);
#endif

      /*
       * 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;
      }

      WAKE_LISTENER(1);

      /* reinstall self */
      (void) SIGNAL_REINSTALL( sig, slap_sig_shutdown );
}

RETSIGTYPE
slap_sig_wake( int sig )
{
      WAKE_LISTENER(1);

      /* reinstall self */
      (void) SIGNAL_REINSTALL( sig, slap_sig_wake );
}


void
slapd_add_internal( ber_socket_t s, int isactive )
{
      slapd_add( s, isactive, NULL );
}

Listener **
slapd_get_listeners( void )
{
      return slap_listeners;
}

void
slap_wake_listener()
{
      WAKE_LISTENER(1);
}

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