git.sur5r.net Git - openldap/blob - servers/slapd/overlays/syncprov.c

   1 /* $OpenLDAP$ */
   2 /* syncprov.c - syncrepl provider */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2004-2005 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16 /* ACKNOWLEDGEMENTS:
  17  * This work was initially developed by Howard Chu for inclusion in
  18  * OpenLDAP Software.
  19  */
  20
  21 #include "portable.h"
  22
  23 #ifdef SLAPD_OVER_SYNCPROV
  24
  25 #include <ac/string.h>
  26 #include "lutil.h"
  27 #include "slap.h"
  28
  29 /* A modify request on a particular entry */
  30 typedef struct modinst {
  31         struct modinst *mi_next;
  32         Operation *mi_op;
  33 } modinst;
  34
  35 typedef struct modtarget {
  36         struct modinst *mt_mods;
  37         struct modinst *mt_tail;
  38         Operation *mt_op;
  39         ldap_pvt_thread_mutex_t mt_mutex;
  40 } modtarget;
  41
  42 /* A queued result of a persistent search */
  43 typedef struct syncres {
  44         struct syncres *s_next;
  45         struct berval s_dn;
  46         struct berval s_ndn;
  47         struct berval s_uuid;
  48         struct berval s_csn;
  49         char s_mode;
  50         char s_isreference;
  51 } syncres;
  52
  53 /* Record of a persistent search */
  54 typedef struct syncops {
  55         struct syncops *s_next;
  56         struct berval   s_base;         /* ndn of search base */
  57         ID              s_eid;          /* entryID of search base */
  58         Operation       *s_op;          /* search op */
  59         int             s_sid;
  60         int             s_rid;
  61         struct berval s_filterstr;
  62         int             s_flags;        /* search status */
  63         int             s_inuse;        /* reference count */
  64         struct syncres *s_res;
  65         struct syncres *s_restail;
  66         ldap_pvt_thread_mutex_t s_mutex;
  67 } syncops;
  68
  69 /* A received sync control */
  70 typedef struct sync_control {
  71         struct sync_cookie sr_state;
  72         int sr_rhint;
  73 } sync_control;
  74
  75 #if 0 /* moved back to slap.h */
  76 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  77 #endif
  78 /* o_sync_mode uses data bits of o_sync */
  79 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  80
  81 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  82 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  83 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  84 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  85
  86 #define PS_IS_REFRESHING        0x01
  87
  88 /* Record of which searches matched at premodify step */
  89 typedef struct syncmatches {
  90         struct syncmatches *sm_next;
  91         syncops *sm_op;
  92 } syncmatches;
  93
  94 /* Session log data */
  95 typedef struct slog_entry {
  96         struct slog_entry *se_next;
  97         struct berval se_uuid;
  98         struct berval se_csn;
  99         ber_tag_t       se_tag;
 100 } slog_entry;
 101
 102 typedef struct sessionlog {
 103         struct sessionlog *sl_next;
 104         int             sl_sid;
 105         struct berval   sl_mincsn;
 106         int             sl_num;
 107         int             sl_size;
 108         slog_entry *sl_head;
 109         slog_entry *sl_tail;
 110         ldap_pvt_thread_mutex_t sl_mutex;
 111 } sessionlog;
 112
 113 /* The main state for this overlay */
 114 typedef struct syncprov_info_t {
 115         syncops         *si_ops;
 116         struct berval   si_ctxcsn;      /* ldapsync context */
 117         int             si_chkops;      /* checkpointing info */
 118         int             si_chktime;
 119         int             si_numops;      /* number of ops since last checkpoint */
 120         time_t  si_chklast;     /* time of last checkpoint */
 121         Avlnode *si_mods;       /* entries being modified */
 122         sessionlog      *si_logs;
 123         ldap_pvt_thread_mutex_t si_csn_mutex;
 124         ldap_pvt_thread_mutex_t si_ops_mutex;
 125         ldap_pvt_thread_mutex_t si_mods_mutex;
 126         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 127 } syncprov_info_t;
 128
 129 typedef struct opcookie {
 130         slap_overinst *son;
 131         syncmatches *smatches;
 132         struct berval sdn;      /* DN of entry, for deletes */
 133         struct berval sndn;
 134         struct berval suuid;    /* UUID of entry */
 135         struct berval sctxcsn;
 136         int sreference; /* Is the entry a reference? */
 137 } opcookie;
 138
 139 typedef struct fbase_cookie {
 140         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 141         syncops *fss;   /* persistent search we're testing against */
 142         int fbase;      /* if TRUE we found the search base and it's still valid */
 143         int fscope;     /* if TRUE then fdn is within the psearch scope */
 144 } fbase_cookie;
 145
 146 static AttributeName csn_anlist[2];
 147 static AttributeName uuid_anlist[2];
 148
 149 /* Build a LDAPsync intermediate state control */
 150 static int
 151 syncprov_state_ctrl(
 152         Operation       *op,
 153         SlapReply       *rs,
 154         Entry           *e,
 155         int             entry_sync_state,
 156         LDAPControl     **ctrls,
 157         int             num_ctrls,
 158         int             send_cookie,
 159         struct berval   *cookie )
 160 {
 161         Attribute* a;
 162         int ret;
 163         int res;
 164         const char *text = NULL;
 165
 166         BerElementBuffer berbuf;
 167         BerElement *ber = (BerElement *)&berbuf;
 168
 169         struct berval   entryuuid_bv = BER_BVNULL;
 170
 171         ber_init2( ber, 0, LBER_USE_DER );
 172         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 173
 174         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 175
 176         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 177                 AttributeDescription *desc = a->a_desc;
 178                 if ( desc == slap_schema.si_ad_entryUUID ) {
 179                         entryuuid_bv = a->a_nvals[0];
 180                         break;
 181                 }
 182         }
 183
 184         if ( send_cookie && cookie ) {
 185                 ber_printf( ber, "{eOON}",
 186                         entry_sync_state, &entryuuid_bv, cookie );
 187         } else {
 188                 ber_printf( ber, "{eON}",
 189                         entry_sync_state, &entryuuid_bv );
 190         }
 191
 192         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 193         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 194         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 195
 196         ber_free_buf( ber );
 197
 198         if ( ret < 0 ) {
 199                 Debug( LDAP_DEBUG_TRACE,
 200                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 201                         0, 0, 0 );
 202                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 203                 return ret;
 204         }
 205
 206         return LDAP_SUCCESS;
 207 }
 208
 209 /* Build a LDAPsync final state control */
 210 static int
 211 syncprov_done_ctrl(
 212         Operation       *op,
 213         SlapReply       *rs,
 214         LDAPControl     **ctrls,
 215         int                     num_ctrls,
 216         int                     send_cookie,
 217         struct berval *cookie,
 218         int                     refreshDeletes )
 219 {
 220         int ret;
 221         BerElementBuffer berbuf;
 222         BerElement *ber = (BerElement *)&berbuf;
 223
 224         ber_init2( ber, NULL, LBER_USE_DER );
 225         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 226
 227         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 228
 229         ber_printf( ber, "{" );
 230         if ( send_cookie && cookie ) {
 231                 ber_printf( ber, "O", cookie );
 232         }
 233         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 234                 ber_printf( ber, "b", refreshDeletes );
 235         }
 236         ber_printf( ber, "N}" );
 237
 238         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 239         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 240         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 241
 242         ber_free_buf( ber );
 243
 244         if ( ret < 0 ) {
 245                 Debug( LDAP_DEBUG_TRACE,
 246                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 247                         0, 0, 0 );
 248                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 249                 return ret;
 250         }
 251
 252         return LDAP_SUCCESS;
 253 }
 254
 255 #if 0
 256 /* Generate state based on session log - not implemented yet */
 257 static int
 258 syncprov_state_ctrl_from_slog(
 259         Operation       *op,
 260         SlapReply       *rs,
 261         struct slog_entry *slog_e,
 262         int                     entry_sync_state,
 263         LDAPControl     **ctrls,
 264         int                     num_ctrls,
 265         int                     send_cookie,
 266         struct berval   *cookie)
 267 {
 268         Attribute* a;
 269         int ret;
 270         int res;
 271         const char *text = NULL;
 272
 273         BerElementBuffer berbuf;
 274         BerElement *ber = (BerElement *)&berbuf;
 275
 276         struct berval entryuuid_bv      = BER_BVNULL;
 277
 278         ber_init2( ber, NULL, LBER_USE_DER );
 279         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 280
 281         ctrls[num_ctrls] = ch_malloc ( sizeof ( LDAPControl ) );
 282
 283         entryuuid_bv = slog_e->sl_uuid;
 284
 285         if ( send_cookie && cookie ) {
 286                 ber_printf( ber, "{eOON}",
 287                         entry_sync_state, &entryuuid_bv, cookie );
 288         } else {
 289                 ber_printf( ber, "{eON}",
 290                         entry_sync_state, &entryuuid_bv );
 291         }
 292
 293         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 294         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 295         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 296
 297         ber_free_buf( ber );
 298
 299         if ( ret < 0 ) {
 300                 Debug( LDAP_DEBUG_TRACE,
 301                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 302                         0, 0, 0 );
 303                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 304                 return ret;
 305         }
 306
 307         return LDAP_SUCCESS;
 308 }
 309 #endif
 310
 311 static int
 312 syncprov_sendinfo(
 313         Operation       *op,
 314         SlapReply       *rs,
 315         int                     type,
 316         struct berval *cookie,
 317         int                     refreshDone,
 318         BerVarray       syncUUIDs,
 319         int                     refreshDeletes )
 320 {
 321         BerElementBuffer berbuf;
 322         BerElement *ber = (BerElement *)&berbuf;
 323         struct berval rspdata;
 324
 325         int ret;
 326
 327         ber_init2( ber, NULL, LBER_USE_DER );
 328         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 329
 330         if ( type ) {
 331                 switch ( type ) {
 332                 case LDAP_TAG_SYNC_NEW_COOKIE:
 333                         ber_printf( ber, "tO", type, cookie );
 334                         break;
 335                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 336                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 337                         ber_printf( ber, "t{", type );
 338                         if ( cookie ) {
 339                                 ber_printf( ber, "O", cookie );
 340                         }
 341                         if ( refreshDone == 0 ) {
 342                                 ber_printf( ber, "b", refreshDone );
 343                         }
 344                         ber_printf( ber, "N}" );
 345                         break;
 346                 case LDAP_TAG_SYNC_ID_SET:
 347                         ber_printf( ber, "t{", type );
 348                         if ( cookie ) {
 349                                 ber_printf( ber, "O", cookie );
 350                         }
 351                         if ( refreshDeletes == 1 ) {
 352                                 ber_printf( ber, "b", refreshDeletes );
 353                         }
 354                         ber_printf( ber, "[W]", syncUUIDs );
 355                         ber_printf( ber, "N}" );
 356                         break;
 357                 default:
 358                         Debug( LDAP_DEBUG_TRACE,
 359                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 360                                 type, 0, 0 );
 361                         return LDAP_OTHER;
 362                 }
 363         }
 364
 365         ret = ber_flatten2( ber, &rspdata, 0 );
 366
 367         if ( ret < 0 ) {
 368                 Debug( LDAP_DEBUG_TRACE,
 369                         "syncprov_sendinfo: ber_flatten2 failed\n",
 370                         0, 0, 0 );
 371                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 372                 return ret;
 373         }
 374
 375         rs->sr_rspoid = LDAP_SYNC_INFO;
 376         rs->sr_rspdata = &rspdata;
 377         send_ldap_intermediate( op, rs );
 378         rs->sr_rspdata = NULL;
 379         ber_free_buf( ber );
 380
 381         return LDAP_SUCCESS;
 382 }
 383
 384 /* Find a modtarget in an AVL tree */
 385 static int
 386 sp_avl_cmp( const void *c1, const void *c2 )
 387 {
 388         const modtarget *m1, *m2;
 389         int rc;
 390
 391         m1 = c1; m2 = c2;
 392         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 393
 394         if ( rc ) return rc;
 395         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 396 }
 397
 398 /* syncprov_findbase:
 399  *   finds the true DN of the base of a search (with alias dereferencing) and
 400  * checks to make sure the base entry doesn't get replaced with a different
 401  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 402  * change is detected, any persistent search on this base must be terminated /
 403  * reloaded.
 404  *   On the first call, we just save the DN and entryID. On subsequent calls
 405  * we compare the DN and entryID with the saved values.
 406  */
 407 static int
 408 findbase_cb( Operation *op, SlapReply *rs )
 409 {
 410         slap_callback *sc = op->o_callback;
 411
 412         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 413                 fbase_cookie *fc = sc->sc_private;
 414
 415                 /* If no entryID, we're looking for the first time.
 416                  * Just store whatever we got.
 417                  */
 418                 if ( fc->fss->s_eid == NOID ) {
 419                         fc->fbase = 1;
 420                         fc->fss->s_eid = rs->sr_entry->e_id;
 421                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 422
 423                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 424                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 425
 426                 /* OK, the DN is the same and the entryID is the same. Now
 427                  * see if the fdn resides in the scope.
 428                  */
 429                         fc->fbase = 1;
 430                         switch ( fc->fss->s_op->ors_scope ) {
 431                         case LDAP_SCOPE_BASE:
 432                                 fc->fscope = dn_match( fc->fdn, &rs->sr_entry->e_nname );
 433                                 break;
 434                         case LDAP_SCOPE_ONELEVEL: {
 435                                 struct berval pdn;
 436                                 dnParent( fc->fdn, &pdn );
 437                                 fc->fscope = dn_match( &pdn, &rs->sr_entry->e_nname );
 438                                 break; }
 439                         case LDAP_SCOPE_SUBTREE:
 440                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname );
 441                                 break;
 442 #ifdef LDAP_SCOPE_SUBORDINATE
 443                         case LDAP_SCOPE_SUBORDINATE:
 444                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname ) &&
 445                                         !dn_match( fc->fdn, &rs->sr_entry->e_nname );
 446                                 break;
 447 #endif
 448                         }
 449                 }
 450         }
 451         if ( rs->sr_err != LDAP_SUCCESS ) {
 452                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 453         }
 454         return LDAP_SUCCESS;
 455 }
 456
 457 static int
 458 syncprov_findbase( Operation *op, fbase_cookie *fc )
 459 {
 460         opcookie *opc = op->o_callback->sc_private;
 461         slap_overinst *on = opc->son;
 462         syncprov_info_t         *si = on->on_bi.bi_private;
 463
 464         slap_callback cb = {0};
 465         Operation fop;
 466         SlapReply frs = { REP_RESULT };
 467         int rc;
 468
 469         fop = *op;
 470
 471         cb.sc_response = findbase_cb;
 472         cb.sc_private = fc;
 473
 474         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync mode */
 475         fop.o_callback = &cb;
 476         fop.o_tag = LDAP_REQ_SEARCH;
 477         fop.ors_scope = LDAP_SCOPE_BASE;
 478         fop.ors_deref = fc->fss->s_op->ors_deref;
 479         fop.ors_limit = NULL;
 480         fop.ors_slimit = 1;
 481         fop.ors_tlimit = SLAP_NO_LIMIT;
 482         fop.ors_attrs = slap_anlist_no_attrs;
 483         fop.ors_attrsonly = 1;
 484         fop.ors_filter = fc->fss->s_op->ors_filter;
 485         fop.ors_filterstr = fc->fss->s_op->ors_filterstr;
 486
 487         fop.o_req_ndn = fc->fss->s_op->o_req_ndn;
 488
 489         fop.o_bd->bd_info = on->on_info->oi_orig;
 490         rc = fop.o_bd->be_search( &fop, &frs );
 491         fop.o_bd->bd_info = (BackendInfo *)on;
 492
 493         if ( fc->fbase ) return LDAP_SUCCESS;
 494
 495         /* If entryID has changed, then the base of this search has
 496          * changed. Invalidate the psearch.
 497          */
 498         return LDAP_NO_SUCH_OBJECT;
 499 }
 500
 501 /* syncprov_findcsn:
 502  *   This function has three different purposes, but they all use a search
 503  * that filters on entryCSN so they're combined here.
 504  * 1: at startup time, after a contextCSN has been read from the database,
 505  * we search for all entries with CSN >= contextCSN in case the contextCSN
 506  * was not checkpointed at the previous shutdown.
 507  *
 508  * 2: when the current contextCSN is known and we have a sync cookie, we search
 509  * for one entry with CSN <= the cookie CSN. (Used to search for =.) If an
 510  * entry is found, the cookie CSN is valid, otherwise it is stale.
 511  *
 512  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 513  * CSN, and generate Present records for them. We always collect this result
 514  * in SyncID sets, even if there's only one match.
 515  */
 516 #define FIND_MAXCSN     1
 517 #define FIND_CSN        2
 518 #define FIND_PRESENT    3
 519
 520 static int
 521 findmax_cb( Operation *op, SlapReply *rs )
 522 {
 523         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 524                 struct berval *maxcsn = op->o_callback->sc_private;
 525                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 526                         slap_schema.si_ad_entryCSN );
 527
 528                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 529                         maxcsn->bv_len = a->a_vals[0].bv_len;
 530                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 531                 }
 532         }
 533         return LDAP_SUCCESS;
 534 }
 535
 536 static int
 537 findcsn_cb( Operation *op, SlapReply *rs )
 538 {
 539         slap_callback *sc = op->o_callback;
 540
 541         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 542                 sc->sc_private = (void *)1;
 543         }
 544         return LDAP_SUCCESS;
 545 }
 546
 547 /* Build a list of entryUUIDs for sending in a SyncID set */
 548
 549 #define UUID_LEN        16
 550
 551 typedef struct fpres_cookie {
 552         int num;
 553         BerVarray uuids;
 554         char *last;
 555 } fpres_cookie;
 556
 557 static int
 558 findpres_cb( Operation *op, SlapReply *rs )
 559 {
 560         slap_callback *sc = op->o_callback;
 561         fpres_cookie *pc = sc->sc_private;
 562         Attribute *a;
 563         int ret = SLAP_CB_CONTINUE;
 564
 565         switch ( rs->sr_type ) {
 566         case REP_SEARCH:
 567                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 568                 if ( a ) {
 569                         pc->uuids[pc->num].bv_val = pc->last;
 570                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 571                                 pc->uuids[pc->num].bv_len );
 572                         pc->num++;
 573                         pc->last = pc->uuids[pc->num].bv_val;
 574                         pc->uuids[pc->num].bv_val = NULL;
 575                 }
 576                 ret = LDAP_SUCCESS;
 577                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 578                         break;
 579                 /* FALLTHRU */
 580         case REP_RESULT:
 581                 ret = rs->sr_err;
 582                 if ( pc->num ) {
 583                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 584                                 0, pc->uuids, 0 );
 585                         pc->uuids[pc->num].bv_val = pc->last;
 586                         pc->num = 0;
 587                         pc->last = pc->uuids[0].bv_val;
 588                 }
 589                 break;
 590         default:
 591                 break;
 592         }
 593         return ret;
 594 }
 595
 596 static int
 597 syncprov_findcsn( Operation *op, int mode )
 598 {
 599         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 600         syncprov_info_t         *si = on->on_bi.bi_private;
 601
 602         slap_callback cb = {0};
 603         Operation fop;
 604         SlapReply frs = { REP_RESULT };
 605         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 606         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 607         struct berval fbuf, maxcsn;
 608         Filter cf, af;
 609         AttributeAssertion eq;
 610         int i, rc = LDAP_SUCCESS;
 611         fpres_cookie pcookie;
 612         sync_control *srs;
 613
 614         if ( mode != FIND_MAXCSN ) {
 615                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 616
 617                 if ( srs->sr_state.ctxcsn->bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 618                         return LDAP_OTHER;
 619                 }
 620         }
 621
 622         fop = *op;
 623         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 624
 625         fbuf.bv_val = buf;
 626         cf.f_ava = &eq;
 627         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 628         cf.f_next = NULL;
 629
 630         fop.o_callback = &cb;
 631         fop.ors_limit = NULL;
 632         fop.ors_tlimit = SLAP_NO_LIMIT;
 633         fop.ors_filter = &cf;
 634         fop.ors_filterstr = fbuf;
 635
 636         switch( mode ) {
 637         case FIND_MAXCSN:
 638                 cf.f_choice = LDAP_FILTER_GE;
 639                 cf.f_av_value = si->si_ctxcsn;
 640                 fbuf.bv_len = sprintf( buf, "(entryCSN>=%s)",
 641                         cf.f_av_value.bv_val );
 642                 fop.ors_attrsonly = 0;
 643                 fop.ors_attrs = csn_anlist;
 644                 fop.ors_slimit = SLAP_NO_LIMIT;
 645                 cb.sc_private = &maxcsn;
 646                 cb.sc_response = findmax_cb;
 647                 strcpy( cbuf, si->si_ctxcsn.bv_val );
 648                 maxcsn.bv_val = cbuf;
 649                 maxcsn.bv_len = si->si_ctxcsn.bv_len;
 650                 break;
 651         case FIND_CSN:
 652                 cf.f_choice = LDAP_FILTER_LE;
 653                 cf.f_av_value = *srs->sr_state.ctxcsn;
 654                 fbuf.bv_len = sprintf( buf, "(entryCSN<=%s)",
 655                         cf.f_av_value.bv_val );
 656                 fop.ors_attrsonly = 1;
 657                 fop.ors_attrs = slap_anlist_no_attrs;
 658                 fop.ors_slimit = 1;
 659                 cb.sc_private = NULL;
 660                 cb.sc_response = findcsn_cb;
 661                 break;
 662         case FIND_PRESENT:
 663                 af.f_choice = LDAP_FILTER_AND;
 664                 af.f_next = NULL;
 665                 af.f_and = &cf;
 666                 cf.f_choice = LDAP_FILTER_LE;
 667                 cf.f_av_value = *srs->sr_state.ctxcsn;
 668                 cf.f_next = op->ors_filter;
 669                 fop.ors_filter = &af;
 670                 filter2bv_x( &fop, fop.ors_filter, &fop.ors_filterstr );
 671                 fop.ors_attrsonly = 0;
 672                 fop.ors_attrs = uuid_anlist;
 673                 fop.ors_slimit = SLAP_NO_LIMIT;
 674                 /* We want pure entries, not referrals */
 675                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 676                 cb.sc_private = &pcookie;
 677                 cb.sc_response = findpres_cb;
 678                 pcookie.num = 0;
 679
 680                 /* preallocate storage for a full set */
 681                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 682                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 683                         op->o_tmpmemctx );
 684                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 685                 pcookie.uuids[0].bv_val = pcookie.last;
 686                 pcookie.uuids[0].bv_len = UUID_LEN;
 687                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 688                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 689                         pcookie.uuids[i].bv_len = UUID_LEN;
 690                 }
 691                 break;
 692         }
 693
 694         fop.o_bd->bd_info = on->on_info->oi_orig;
 695         fop.o_bd->be_search( &fop, &frs );
 696         fop.o_bd->bd_info = (BackendInfo *)on;
 697
 698         switch( mode ) {
 699         case FIND_MAXCSN:
 700                 strcpy( si->si_ctxcsnbuf, maxcsn.bv_val );
 701                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
 702                 break;
 703         case FIND_CSN:
 704                 /* If matching CSN was not found, invalidate the context. */
 705                 if ( !cb.sc_private ) rc = LDAP_NO_SUCH_OBJECT;
 706                 break;
 707         case FIND_PRESENT:
 708                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 709                 op->o_tmpfree( fop.ors_filterstr.bv_val, op->o_tmpmemctx );
 710                 break;
 711         }
 712
 713         return rc;
 714 }
 715
 716 /* Queue a persistent search response if still in Refresh stage */
 717 static int
 718 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 719 {
 720         syncres *sr;
 721
 722         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 723                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 724         sr->s_next = NULL;
 725         sr->s_dn.bv_val = (char *)(sr + 1);
 726         sr->s_mode = mode;
 727         sr->s_isreference = opc->sreference;
 728         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 729         *(sr->s_ndn.bv_val++) = '\0';
 730         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 731         *(sr->s_uuid.bv_val++) = '\0';
 732         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 733
 734         if ( !so->s_res ) {
 735                 so->s_res = sr;
 736         } else {
 737                 so->s_restail->s_next = sr;
 738         }
 739         so->s_restail = sr;
 740         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 741         return LDAP_SUCCESS;
 742 }
 743
 744 /* Send a persistent search response */
 745 static int
 746 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry *e, int mode, int queue )
 747 {
 748         slap_overinst *on = opc->son;
 749         syncprov_info_t *si = on->on_bi.bi_private;
 750
 751         SlapReply rs = { REP_SEARCH };
 752         LDAPControl *ctrls[2];
 753         struct berval cookie;
 754         Entry e_uuid = {0};
 755         Attribute a_uuid = {0};
 756         Operation sop = *so->s_op;
 757         Opheader ohdr;
 758
 759         ohdr = *sop.o_hdr;
 760         sop.o_hdr = &ohdr;
 761         sop.o_tmpmemctx = op->o_tmpmemctx;
 762         sop.o_bd = op->o_bd;
 763         sop.o_controls = op->o_controls;
 764
 765         if ( queue && (so->s_flags & PS_IS_REFRESHING) ) {
 766                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 767                 if ( so->s_flags & PS_IS_REFRESHING )
 768                         return syncprov_qresp( opc, so, mode );
 769                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 770         }
 771
 772         ctrls[1] = NULL;
 773         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn,
 774                 so->s_sid, so->s_rid );
 775
 776         e_uuid.e_attrs = &a_uuid;
 777         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 778         a_uuid.a_nvals = &opc->suuid;
 779         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 780                 mode, ctrls, 0, 1, &cookie );
 781
 782         rs.sr_entry = e;
 783         rs.sr_ctrls = ctrls;
 784         switch( mode ) {
 785         case LDAP_SYNC_ADD:
 786                 if ( opc->sreference ) {
 787                         rs.sr_ref = get_entry_referrals( &sop, e );
 788                         send_search_reference( &sop, &rs );
 789                         ber_bvarray_free( rs.sr_ref );
 790                         break;
 791                 }
 792                 /* fallthru */
 793         case LDAP_SYNC_MODIFY:
 794                 rs.sr_attrs = sop.ors_attrs;
 795                 send_search_entry( &sop, &rs );
 796                 break;
 797         case LDAP_SYNC_DELETE:
 798                 e_uuid.e_attrs = NULL;
 799                 e_uuid.e_name = opc->sdn;
 800                 e_uuid.e_nname = opc->sndn;
 801                 rs.sr_entry = &e_uuid;
 802                 if ( opc->sreference ) {
 803                         struct berval bv = BER_BVNULL;
 804                         rs.sr_ref = &bv;
 805                         send_search_reference( &sop, &rs );
 806                 } else {
 807                         send_search_entry( &sop, &rs );
 808                 }
 809                 break;
 810         default:
 811                 assert(0);
 812         }
 813         op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 814         rs.sr_ctrls = NULL;
 815         return rs.sr_err;
 816 }
 817
 818 static void
 819 syncprov_free_syncop( syncops *so )
 820 {
 821         syncres *sr, *srnext;
 822         GroupAssertion *ga, *gnext;
 823
 824         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 825         so->s_inuse--;
 826         if ( so->s_inuse > 0 ) {
 827                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 828                 return;
 829         }
 830         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 831         filter_free( so->s_op->ors_filter );
 832         for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 833                 gnext = ga->ga_next;
 834                 ch_free( ga );
 835         }
 836         ch_free( so->s_op );
 837         ch_free( so->s_base.bv_val );
 838         for ( sr=so->s_res; sr; sr=srnext ) {
 839                 srnext = sr->s_next;
 840                 ch_free( sr );
 841         }
 842         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 843         ch_free( so );
 844 }
 845
 846 static int
 847 syncprov_drop_psearch( syncops *so, int lock )
 848 {
 849         if ( lock )
 850                 ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 851         so->s_op->o_conn->c_n_ops_executing--;
 852         so->s_op->o_conn->c_n_ops_completed++;
 853         LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, slap_op,
 854                 o_next );
 855         if ( lock )
 856                 ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 857         syncprov_free_syncop( so );
 858 }
 859
 860 static int
 861 syncprov_op_abandon( Operation *op, SlapReply *rs )
 862 {
 863         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 864         syncprov_info_t         *si = on->on_bi.bi_private;
 865         syncops *so, *soprev;
 866
 867         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 868         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 869                 soprev=so, so=so->s_next ) {
 870                 if ( so->s_op->o_connid == op->o_connid &&
 871                         so->s_op->o_msgid == op->orn_msgid ) {
 872                                 so->s_op->o_abandon = 1;
 873                                 soprev->s_next = so->s_next;
 874                                 break;
 875                 }
 876         }
 877         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 878         if ( so ) {
 879                 /* Is this really a Cancel exop? */
 880                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 881                         rs->sr_err = LDAP_CANCELLED;
 882                         send_ldap_result( so->s_op, rs );
 883                 }
 884                 /* Our cloned searches have no ctrls set.
 885                  * we don't want to muck with real search ops
 886                  * from the frontend.
 887                  */
 888                 if ( ! so->s_op->o_sync )
 889                         syncprov_drop_psearch( so, 0 );
 890         }
 891         return SLAP_CB_CONTINUE;
 892 }
 893
 894 /* Find which persistent searches are affected by this operation */
 895 static void
 896 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 897 {
 898         slap_overinst *on = opc->son;
 899         syncprov_info_t         *si = on->on_bi.bi_private;
 900
 901         fbase_cookie fc;
 902         syncops *ss, *sprev, *snext;
 903         Entry *e;
 904         Attribute *a;
 905         int rc;
 906         struct berval newdn;
 907         int freefdn = 0;
 908
 909         fc.fdn = &op->o_req_ndn;
 910         /* compute new DN */
 911         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 912                 struct berval pdn;
 913                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 914                 else dnParent( fc.fdn, &pdn );
 915                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
 916                 fc.fdn = &newdn;
 917                 freefdn = 1;
 918         }
 919         if ( op->o_tag != LDAP_REQ_ADD ) {
 920                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 921                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
 922                 op->o_bd->bd_info = (BackendInfo *)on;
 923                 if ( rc ) return;
 924         } else {
 925                 e = op->ora_e;
 926         }
 927
 928         /* Never replicate these */
 929         if ( is_entry_syncConsumerSubentry( e )) {
 930                 goto done;
 931         }
 932         if ( saveit ) {
 933                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
 934                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
 935                 opc->sreference = is_entry_referral( e );
 936         }
 937         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
 938                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
 939                 if ( a )
 940                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
 941         }
 942
 943         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 944         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
 945                 sprev = ss, ss=snext)
 946         {
 947                 syncmatches *sm;
 948                 int found = 0;
 949
 950                 snext = ss->s_next;
 951                 /* validate base */
 952                 fc.fss = ss;
 953                 fc.fbase = 0;
 954                 fc.fscope = 0;
 955
 956                 /* If the base of the search is missing, signal a refresh */
 957                 rc = syncprov_findbase( op, &fc );
 958                 if ( rc != LDAP_SUCCESS ) {
 959                         SlapReply rs = {REP_RESULT};
 960                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
 961                                 "search base has changed" );
 962                         sprev->s_next = snext;
 963                         syncprov_drop_psearch( ss, 1 );
 964                         continue;
 965                 }
 966
 967                 /* If we're sending results now, look for this op in old matches */
 968                 if ( !saveit ) {
 969                         syncmatches *old;
 970                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
 971                                 old=sm, sm=sm->sm_next ) {
 972                                 if ( sm->sm_op == ss ) {
 973                                         found = 1;
 974                                         old->sm_next = sm->sm_next;
 975                                         op->o_tmpfree( sm, op->o_tmpmemctx );
 976                                         break;
 977                                 }
 978                         }
 979                 }
 980
 981                 /* check if current o_req_dn is in scope and matches filter */
 982                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
 983                         LDAP_COMPARE_TRUE ) {
 984                         if ( saveit ) {
 985                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
 986                                 sm->sm_next = opc->smatches;
 987                                 sm->sm_op = ss;
 988                                 ss->s_inuse++;
 989                                 opc->smatches = sm;
 990                         } else {
 991                                 /* if found send UPDATE else send ADD */
 992                                 syncprov_sendresp( op, opc, ss, e,
 993                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
 994                         }
 995                 } else if ( !saveit && found ) {
 996                         /* send DELETE */
 997                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
 998                 }
 999         }
1000         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1001 done:
1002         if ( op->o_tag != LDAP_REQ_ADD ) {
1003                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1004                 be_entry_release_rw( op, e, 0 );
1005                 op->o_bd->bd_info = (BackendInfo *)on;
1006         }
1007         if ( freefdn ) {
1008                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1009         }
1010 }
1011
1012 static int
1013 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1014 {
1015         slap_callback *cb = op->o_callback;
1016         opcookie *opc = cb->sc_private;
1017         slap_overinst *on = opc->son;
1018         syncprov_info_t         *si = on->on_bi.bi_private;
1019         syncmatches *sm, *snext;
1020         modtarget *mt, mtdummy;
1021
1022         for (sm = opc->smatches; sm; sm=snext) {
1023                 snext = sm->sm_next;
1024                 syncprov_free_syncop( sm->sm_op );
1025                 op->o_tmpfree( sm, op->o_tmpmemctx );
1026         }
1027
1028         /* Remove op from lock table */
1029         mtdummy.mt_op = op;
1030         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1031         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1032         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1033         if ( mt ) {
1034                 modinst *mi = mt->mt_mods;
1035
1036                 /* If there are more, promote the next one */
1037                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1038                 if ( mi->mi_next ) {
1039                         mt->mt_mods = mi->mi_next;
1040                         mt->mt_op = mt->mt_mods->mi_op;
1041                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1042                 } else {
1043                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1044                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1045                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1046                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1047                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1048                         ch_free( mt );
1049                 }
1050         }
1051         if ( !BER_BVISNULL( &opc->suuid ))
1052                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1053         if ( !BER_BVISNULL( &opc->sndn ))
1054                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1055         if ( !BER_BVISNULL( &opc->sdn ))
1056                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1057         op->o_callback = cb->sc_next;
1058         op->o_tmpfree(cb, op->o_tmpmemctx);
1059 }
1060
1061 static void
1062 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1063 {
1064         syncprov_info_t         *si = on->on_bi.bi_private;
1065         Modifications mod;
1066         Operation opm;
1067         struct berval bv[2];
1068         BackendInfo *orig;
1069         slap_callback cb = {0};
1070
1071         mod.sml_values = bv;
1072         bv[1].bv_val = NULL;
1073         bv[0] = si->si_ctxcsn;
1074         mod.sml_nvalues = NULL;
1075         mod.sml_desc = slap_schema.si_ad_contextCSN;
1076         mod.sml_op = LDAP_MOD_REPLACE;
1077         mod.sml_next = NULL;
1078
1079         cb.sc_response = slap_null_cb;
1080         opm = *op;
1081         opm.o_tag = LDAP_REQ_MODIFY;
1082         opm.o_callback = &cb;
1083         opm.orm_modlist = &mod;
1084         opm.o_req_dn = op->o_bd->be_suffix[0];
1085         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1086         orig = opm.o_bd->bd_info;
1087         opm.o_bd->bd_info = on->on_info->oi_orig;
1088         opm.o_bd->be_modify( &opm, rs );
1089 }
1090
1091 static void
1092 syncprov_add_slog( Operation *op, struct berval *csn )
1093 {
1094         opcookie *opc = op->o_callback->sc_private;
1095         slap_overinst *on = opc->son;
1096         syncprov_info_t         *si = on->on_bi.bi_private;
1097         sessionlog *sl;
1098         slog_entry *se;
1099
1100         for ( sl = si->si_logs; sl; sl=sl->sl_next ) {
1101                 /* Allocate a record. UUIDs are not NUL-terminated. */
1102                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1103                         csn->bv_len + 1 );
1104                 se->se_next = NULL;
1105                 se->se_tag = op->o_tag;
1106
1107                 se->se_uuid.bv_val = (char *)(se+1);
1108                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len + 1;
1109                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1110                 se->se_uuid.bv_len = opc->suuid.bv_len;
1111
1112                 AC_MEMCPY( se->se_csn.bv_val, csn->bv_val, csn->bv_len );
1113                 se->se_csn.bv_val[csn->bv_len] = '\0';
1114                 se->se_csn.bv_len = csn->bv_len;
1115
1116                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1117                 if ( sl->sl_head ) {
1118                         sl->sl_tail->se_next = se;
1119                 } else {
1120                         sl->sl_head = se;
1121                 }
1122                 sl->sl_tail = se;
1123                 sl->sl_num++;
1124                 while ( sl->sl_num > sl->sl_size ) {
1125                         se = sl->sl_head;
1126                         sl->sl_head = se->se_next;
1127                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1128                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1129                         ch_free( se );
1130                         sl->sl_num--;
1131                         if ( !sl->sl_head ) {
1132                                 sl->sl_tail = NULL;
1133                         }
1134                 }
1135                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1136         }
1137 }
1138
1139 /* Just set a flag if we found the matching entry */
1140 static int
1141 playlog_cb( Operation *op, SlapReply *rs )
1142 {
1143         if ( rs->sr_type == REP_SEARCH ) {
1144                 op->o_callback->sc_private = (void *)1;
1145         }
1146         return rs->sr_err;
1147 }
1148
1149 /* enter with sl->sl_mutex locked, release before returning */
1150 static void
1151 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1152         struct berval *oldcsn, struct berval *ctxcsn )
1153 {
1154         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1155         syncprov_info_t         *si = on->on_bi.bi_private;
1156         slog_entry *se;
1157         int i, j, ndel, num, nmods, mmods;
1158         BerVarray uuids;
1159
1160         if ( !sl->sl_num ) {
1161                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1162                 return;
1163         }
1164
1165         num = sl->sl_num;
1166         i = 0;
1167         nmods = 0;
1168
1169         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1170                 num * UUID_LEN, op->o_tmpmemctx );
1171
1172         uuids[0].bv_val = (char *)(uuids + num + 1);
1173
1174         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1175          * and everything else at the end. Do this first so we can
1176          * unlock the list mutex.
1177          */
1178         for ( se=sl->sl_head; se; se=se->se_next ) {
1179                 if ( ber_bvcmp( &se->se_csn, oldcsn ) < 0 ) continue;
1180                 if ( ber_bvcmp( &se->se_csn, ctxcsn ) > 0 ) break;
1181                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1182                         j = i;
1183                         i++;
1184                 } else {
1185                         nmods++;
1186                         j = num - nmods;
1187                 }
1188                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1189                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1190                 uuids[j].bv_len = UUID_LEN;
1191         }
1192         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1193
1194         ndel = i;
1195
1196         /* Zero out unused slots */
1197         for ( i=ndel; i < num - nmods; i++ )
1198                 uuids[i].bv_len = 0;
1199
1200         /* Mods must be validated to see if they belong in this delete set.
1201          */
1202
1203         mmods = nmods;
1204         /* Strip any duplicates */
1205         for ( i=0; i<nmods; i++ ) {
1206                 for ( j=0; j<ndel; j++ ) {
1207                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1208                                 uuids[num - 1 - i].bv_len = 0;
1209                                 mmods --;
1210                                 break;
1211                         }
1212                 }
1213                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1214                 for ( j=0; j<i; j++ ) {
1215                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1216                                 uuids[num - 1 - i].bv_len = 0;
1217                                 mmods --;
1218                                 break;
1219                         }
1220                 }
1221         }
1222
1223         if ( mmods ) {
1224                 Operation fop;
1225                 SlapReply frs = { REP_RESULT };
1226                 int rc;
1227                 Filter mf, af;
1228                 AttributeAssertion eq;
1229                 slap_callback cb = {0};
1230
1231                 fop = *op;
1232
1233                 fop.o_sync_mode = 0;
1234                 fop.o_callback = &cb;
1235                 fop.ors_limit = NULL;
1236                 fop.ors_tlimit = SLAP_NO_LIMIT;
1237                 fop.ors_attrs = slap_anlist_all_attributes;
1238                 fop.ors_attrsonly = 0;
1239                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1240
1241                 af.f_choice = LDAP_FILTER_AND;
1242                 af.f_next = NULL;
1243                 af.f_and = &mf;
1244                 mf.f_choice = LDAP_FILTER_EQUALITY;
1245                 mf.f_ava = &eq;
1246                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1247                 mf.f_next = fop.ors_filter;
1248
1249                 fop.ors_filter = &af;
1250
1251                 cb.sc_response = playlog_cb;
1252                 fop.o_bd->bd_info = on->on_info->oi_orig;
1253
1254                 for ( i=ndel; i<num; i++ ) {
1255                         if ( uuids[i].bv_len == 0 ) continue;
1256
1257                         mf.f_av_value = uuids[i];
1258                         cb.sc_private = NULL;
1259                         fop.ors_slimit = 1;
1260                         rc = fop.o_bd->be_search( &fop, &frs );
1261
1262                         /* If entry was not found, add to delete list */
1263                         if ( !cb.sc_private ) {
1264                                 uuids[ndel++] = uuids[i];
1265                         }
1266                 }
1267                 fop.o_bd->bd_info = (BackendInfo *)on;
1268         }
1269         if ( ndel ) {
1270                 uuids[ndel].bv_val = NULL;
1271                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL, 0, uuids, 1 );
1272         }
1273 }
1274
1275 static int
1276 syncprov_op_response( Operation *op, SlapReply *rs )
1277 {
1278         opcookie *opc = op->o_callback->sc_private;
1279         slap_overinst *on = opc->son;
1280         syncprov_info_t         *si = on->on_bi.bi_private;
1281         syncmatches *sm;
1282
1283         if ( rs->sr_err == LDAP_SUCCESS )
1284         {
1285                 struct berval maxcsn = BER_BVNULL, curcsn = BER_BVNULL;
1286                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1287
1288                 /* Update our context CSN */
1289                 cbuf[0] = '\0';
1290                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1291                 slap_get_commit_csn( op, &maxcsn, &curcsn );
1292                 if ( !BER_BVISNULL( &maxcsn ) ) {
1293                         strcpy( cbuf, maxcsn.bv_val );
1294                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1295                                 strcpy( si->si_ctxcsnbuf, cbuf );
1296                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1297                         }
1298                 }
1299
1300                 si->si_numops++;
1301                 if ( si->si_chkops || si->si_chktime ) {
1302                         int do_check=0;
1303                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1304                                 do_check = 1;
1305                                 si->si_numops = 0;
1306                         }
1307                         if ( si->si_chktime &&
1308                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1309                                 do_check = 1;
1310                                 si->si_chklast = op->o_time;
1311                         }
1312                         if ( do_check ) {
1313                                 syncprov_checkpoint( op, rs, on );
1314                         }
1315                 }
1316                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1317
1318                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1319                 opc->sctxcsn.bv_val = cbuf;
1320
1321                 /* Handle any persistent searches */
1322                 if ( si->si_ops ) {
1323                         switch(op->o_tag) {
1324                         case LDAP_REQ_ADD:
1325                         case LDAP_REQ_MODIFY:
1326                         case LDAP_REQ_MODRDN:
1327                         case LDAP_REQ_EXTENDED:
1328                                 syncprov_matchops( op, opc, 0 );
1329                                 break;
1330                         case LDAP_REQ_DELETE:
1331                                 /* for each match in opc->smatches:
1332                                  *   send DELETE msg
1333                                  */
1334                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1335                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1336                                         if ( sm->sm_op->s_op->o_abandon )
1337                                                 continue;
1338                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
1339                                                 LDAP_SYNC_DELETE, 1 );
1340                                 }
1341                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1342                                 break;
1343                         }
1344                 }
1345
1346                 /* Add any log records */
1347                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1348                         syncprov_add_slog( op, &curcsn );
1349                 }
1350
1351         }
1352         return SLAP_CB_CONTINUE;
1353 }
1354
1355 /* We don't use a subentry to store the context CSN any more.
1356  * We expose the current context CSN as an operational attribute
1357  * of the suffix entry.
1358  */
1359 static int
1360 syncprov_op_compare( Operation *op, SlapReply *rs )
1361 {
1362         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1363         syncprov_info_t         *si = on->on_bi.bi_private;
1364         int rc = SLAP_CB_CONTINUE;
1365
1366         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1367                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1368         {
1369                 Entry e = {0};
1370                 Attribute a = {0};
1371                 struct berval bv[2];
1372
1373                 e.e_name = op->o_bd->be_suffix[0];
1374                 e.e_nname = op->o_bd->be_nsuffix[0];
1375
1376                 BER_BVZERO( &bv[1] );
1377                 bv[0] = si->si_ctxcsn;
1378
1379                 a.a_desc = slap_schema.si_ad_contextCSN;
1380                 a.a_vals = bv;
1381                 a.a_nvals = a.a_vals;
1382
1383                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1384
1385                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1386                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1387                 if ( ! rs->sr_err ) {
1388                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1389                         goto return_results;
1390                 }
1391
1392                 if ( get_assert( op ) &&
1393                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1394                 {
1395                         rs->sr_err = LDAP_ASSERTION_FAILED;
1396                         goto return_results;
1397                 }
1398
1399
1400                 rs->sr_err = LDAP_COMPARE_FALSE;
1401
1402                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1403                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1404                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1405                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1406                 {
1407                         rs->sr_err = LDAP_COMPARE_TRUE;
1408                 }
1409
1410 return_results:;
1411
1412                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1413
1414                 send_ldap_result( op, rs );
1415
1416                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1417                         rs->sr_err = LDAP_SUCCESS;
1418                 }
1419                 rc = rs->sr_err;
1420         }
1421
1422         return rc;
1423 }
1424
1425 static int
1426 syncprov_op_mod( Operation *op, SlapReply *rs )
1427 {
1428         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1429         syncprov_info_t         *si = on->on_bi.bi_private;
1430
1431         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1432                 sizeof(opcookie) +
1433                 (si->si_ops ? sizeof(modinst) : 0 ),
1434                 op->o_tmpmemctx);
1435         opcookie *opc = (opcookie *)(cb+1);
1436         opc->son = on;
1437         cb->sc_response = syncprov_op_response;
1438         cb->sc_cleanup = syncprov_op_cleanup;
1439         cb->sc_private = opc;
1440         cb->sc_next = op->o_callback;
1441         op->o_callback = cb;
1442
1443         /* If there are active persistent searches, lock this operation.
1444          * See seqmod.c for the locking logic on its own.
1445          */
1446         if ( si->si_ops ) {
1447                 modtarget *mt, mtdummy;
1448                 modinst *mi;
1449
1450                 mi = (modinst *)(opc+1);
1451                 mi->mi_op = op;
1452
1453                 /* See if we're already modifying this entry... */
1454                 mtdummy.mt_op = op;
1455                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1456                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1457                 if ( mt ) {
1458                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1459                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1460                         mt->mt_tail->mi_next = mi;
1461                         mt->mt_tail = mi;
1462                         /* wait for this op to get to head of list */
1463                         while ( mt->mt_mods != mi ) {
1464                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1465                                 ldap_pvt_thread_yield();
1466                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1467                         }
1468                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1469                 } else {
1470                         /* Record that we're modifying this entry now */
1471                         mt = ch_malloc( sizeof(modtarget) );
1472                         mt->mt_mods = mi;
1473                         mt->mt_tail = mi;
1474                         mt->mt_op = mi->mi_op;
1475                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1476                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1477                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1478                 }
1479         }
1480
1481         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1482                 syncprov_matchops( op, opc, 1 );
1483
1484
1485         return SLAP_CB_CONTINUE;
1486 }
1487
1488 static int
1489 syncprov_op_extended( Operation *op, SlapReply *rs )
1490 {
1491         if ( exop_is_write( op ))
1492                 return syncprov_op_mod( op, rs );
1493
1494         return SLAP_CB_CONTINUE;
1495 }
1496
1497 typedef struct searchstate {
1498         slap_overinst *ss_on;
1499         syncops *ss_so;
1500         int ss_present;
1501 } searchstate;
1502
1503 static int
1504 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1505 {
1506         if ( rs->sr_ctrls ) {
1507                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1508                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1509                 rs->sr_ctrls = NULL;
1510         }
1511         return 0;
1512 }
1513
1514 static void
1515 syncprov_detach_op( Operation *op, syncops *so )
1516 {
1517         Operation *op2;
1518         int i, alen = 0;
1519         size_t size;
1520         char *ptr;
1521         GroupAssertion *g1, *g2;
1522
1523         /* count the search attrs */
1524         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1525                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1526         }
1527         /* Make a new copy of the operation */
1528         size = sizeof(Operation) + sizeof(Opheader) +
1529                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1530                 op->o_req_dn.bv_len + 1 +
1531                 op->o_req_ndn.bv_len + 1 +
1532                 op->o_ndn.bv_len + 1 +
1533                 so->s_filterstr.bv_len + 1;
1534         op2 = (Operation *)ch_calloc( 1, size );
1535         op2->o_hdr = (Opheader *)(op2+1);
1536
1537         /* Copy the fields we care about explicitly, leave the rest alone */
1538         *op2->o_hdr = *op->o_hdr;
1539         op2->o_tag = op->o_tag;
1540         op2->o_time = op->o_time;
1541         op2->o_bd = op->o_bd;
1542         op2->o_request = op->o_request;
1543
1544         if ( i ) {
1545                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1546                 ptr = (char *)(op2->ors_attrs+i+1);
1547                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1548                         op2->ors_attrs[i] = op->ors_attrs[i];
1549                         op2->ors_attrs[i].an_name.bv_val = ptr;
1550                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1551                 }
1552                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1553         } else {
1554                 ptr = (char *)(op2->o_hdr + 1);
1555         }
1556         op2->o_authz = op->o_authz;
1557         op2->o_ndn.bv_val = ptr;
1558         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1559         op2->o_dn = op2->o_ndn;
1560         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1561         op2->o_req_dn.bv_val = ptr;
1562         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1563         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1564         op2->o_req_ndn.bv_val = ptr;
1565         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1566         op2->ors_filterstr.bv_val = ptr;
1567         strcpy( ptr, so->s_filterstr.bv_val );
1568         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1569         op2->ors_filter = str2filter( ptr );
1570         so->s_op = op2;
1571
1572         /* Copy any cached group ACLs individually */
1573         op2->o_groups = NULL;
1574         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1575                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1576                 *g2 = *g1;
1577                 strcpy( g2->ga_ndn, g1->ga_ndn );
1578                 g2->ga_next = op2->o_groups;
1579                 op2->o_groups = g2;
1580         }
1581
1582         /* Add op2 to conn so abandon will find us */
1583         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1584         op->o_conn->c_n_ops_executing++;
1585         op->o_conn->c_n_ops_completed--;
1586         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1587         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1588 }
1589
1590 static int
1591 syncprov_search_response( Operation *op, SlapReply *rs )
1592 {
1593         searchstate *ss = op->o_callback->sc_private;
1594         slap_overinst *on = ss->ss_on;
1595         syncprov_info_t         *si = on->on_bi.bi_private;
1596         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1597
1598         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1599                 int i;
1600                 /* If we got a referral without a referral object, there's
1601                  * something missing that we cannot replicate. Just ignore it.
1602                  * The consumer will abort because we didn't send the expected
1603                  * control.
1604                  */
1605                 if ( !rs->sr_entry ) {
1606                         assert( rs->sr_entry );
1607                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1608                         return SLAP_CB_CONTINUE;
1609                 }
1610                 if ( srs->sr_state.ctxcsn ) {
1611                         Attribute *a = attr_find( rs->sr_entry->e_attrs,
1612                                 slap_schema.si_ad_entryCSN );
1613
1614                         /* Don't send the ctx entry twice */
1615                         if ( a && bvmatch( &a->a_nvals[0], srs->sr_state.ctxcsn ) )
1616                                 return LDAP_SUCCESS;
1617                 }
1618                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1619                         op->o_tmpmemctx );
1620                 rs->sr_ctrls[1] = NULL;
1621                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1622                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1623         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1624                 struct berval cookie;
1625
1626                 slap_compose_sync_cookie( op, &cookie,
1627                         &op->ors_filter->f_and->f_ava->aa_value,
1628                         srs->sr_state.sid, srs->sr_state.rid );
1629
1630                 /* Is this a regular refresh? */
1631                 if ( !ss->ss_so ) {
1632                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1633                                 op->o_tmpmemctx );
1634                         rs->sr_ctrls[1] = NULL;
1635                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1636                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1637                                         LDAP_SYNC_REFRESH_DELETES );
1638                 } else {
1639                         int locked = 0;
1640                 /* It's RefreshAndPersist, transition to Persist phase */
1641                         syncprov_sendinfo( op, rs, ( ss->ss_present && rs->sr_nentries ) ?
1642                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1643                                 &cookie, 1, NULL, 0 );
1644                         /* Flush any queued persist messages */
1645                         if ( ss->ss_so->s_res ) {
1646                                 syncres *sr, *srnext;
1647                                 Entry *e;
1648                                 opcookie opc;
1649
1650                                 opc.son = on;
1651                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1652                                 locked = 1;
1653                                 for (sr = ss->ss_so->s_res; sr; sr=srnext) {
1654                                         int rc = LDAP_SUCCESS;
1655                                         srnext = sr->s_next;
1656                                         opc.sdn = sr->s_dn;
1657                                         opc.sndn = sr->s_ndn;
1658                                         opc.suuid = sr->s_uuid;
1659                                         opc.sctxcsn = sr->s_csn;
1660                                         opc.sreference = sr->s_isreference;
1661                                         e = NULL;
1662
1663                                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
1664                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1665                                                 rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
1666                                                 op->o_bd->bd_info = (BackendInfo *)on;
1667                                         }
1668                                         if ( rc == LDAP_SUCCESS )
1669                                                 syncprov_sendresp( op, &opc, ss->ss_so, e,
1670                                                         sr->s_mode, 0 );
1671
1672                                         if ( e ) {
1673                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1674                                                 be_entry_release_rw( op, e, 0 );
1675                                                 op->o_bd->bd_info = (BackendInfo *)on;
1676                                         }
1677                                         ch_free( sr );
1678                                 }
1679                                 ss->ss_so->s_res = NULL;
1680                                 ss->ss_so->s_restail = NULL;
1681                         }
1682
1683                         /* Turn off the refreshing flag */
1684                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1685                         if ( locked )
1686                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1687
1688                         /* Detach this Op from frontend control */
1689                         syncprov_detach_op( op, ss->ss_so );
1690
1691                         return LDAP_SUCCESS;
1692                 }
1693         }
1694
1695         return SLAP_CB_CONTINUE;
1696 }
1697
1698 static int
1699 syncprov_op_search( Operation *op, SlapReply *rs )
1700 {
1701         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1702         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1703         slap_callback   *cb;
1704         int gotstate = 0, nochange = 0, do_present = 1;
1705         Filter *fand, *fava;
1706         syncops *sop = NULL;
1707         searchstate *ss;
1708         sync_control *srs;
1709         struct berval ctxcsn;
1710         char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1711
1712         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1713
1714         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1715                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1716                 return rs->sr_err;
1717         }
1718
1719         srs = op->o_controls[slap_cids.sc_LDAPsync];
1720
1721         /* If this is a persistent search, set it up right away */
1722         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1723                 syncops so = {0};
1724                 fbase_cookie fc;
1725                 opcookie opc;
1726                 slap_callback sc;
1727
1728                 fc.fss = &so;
1729                 fc.fbase = 0;
1730                 so.s_eid = NOID;
1731                 so.s_op = op;
1732                 so.s_flags = PS_IS_REFRESHING;
1733                 /* syncprov_findbase expects to be called as a callback... */
1734                 sc.sc_private = &opc;
1735                 opc.son = on;
1736                 cb = op->o_callback;
1737                 op->o_callback = &sc;
1738                 rs->sr_err = syncprov_findbase( op, &fc );
1739                 op->o_callback = cb;
1740
1741                 if ( rs->sr_err != LDAP_SUCCESS ) {
1742                         send_ldap_result( op, rs );
1743                         return rs->sr_err;
1744                 }
1745                 sop = ch_malloc( sizeof( syncops ));
1746                 *sop = so;
1747                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1748                 sop->s_sid = srs->sr_state.sid;
1749                 sop->s_rid = srs->sr_state.rid;
1750                 sop->s_inuse = 1;
1751
1752                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1753                 sop->s_next = si->si_ops;
1754                 si->si_ops = sop;
1755                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1756         }
1757
1758         /* snapshot the ctxcsn */
1759         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1760         strcpy( csnbuf, si->si_ctxcsnbuf );
1761         ctxcsn.bv_len = si->si_ctxcsn.bv_len;
1762         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1763         ctxcsn.bv_val = csnbuf;
1764
1765         /* If we have a cookie, handle the PRESENT lookups */
1766         if ( srs->sr_state.ctxcsn ) {
1767                 sessionlog *sl;
1768
1769                 /* The cookie was validated when it was parsed, just use it */
1770
1771                 /* If just Refreshing and nothing has changed, shortcut it */
1772                 if ( bvmatch( srs->sr_state.ctxcsn, &ctxcsn )) {
1773                         nochange = 1;
1774                         if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1775                                 LDAPControl     *ctrls[2];
1776
1777                                 ctrls[0] = NULL;
1778                                 ctrls[1] = NULL;
1779                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1780                                         NULL, LDAP_SYNC_REFRESH_DELETES );
1781                                 rs->sr_ctrls = ctrls;
1782                                 rs->sr_err = LDAP_SUCCESS;
1783                                 send_ldap_result( op, rs );
1784                                 rs->sr_ctrls = NULL;
1785                                 return rs->sr_err;
1786                         }
1787                         goto shortcut;
1788                 }
1789                 /* Do we have a sessionlog for this search? */
1790                 for ( sl=si->si_logs; sl; sl=sl->sl_next )
1791                         if ( sl->sl_sid == srs->sr_state.sid ) break;
1792                 if ( sl ) {
1793                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1794                         if ( ber_bvcmp( srs->sr_state.ctxcsn, &sl->sl_mincsn ) >= 0 ) {
1795                                 do_present = 0;
1796                                 /* mutex is unlocked in playlog */
1797                                 syncprov_playlog( op, rs, sl, srs->sr_state.ctxcsn, &ctxcsn );
1798                         } else {
1799                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1800                         }
1801                 }
1802                 /* Is the CSN still present in the database? */
1803                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1804                         /* No, so a reload is required */
1805 #if 0           /* the consumer doesn't seem to send this hint */
1806                         if ( op->o_sync_rhint == 0 ) {
1807                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1808                                 return rs->sr_err;
1809                         }
1810 #endif
1811                 } else {
1812                         gotstate = 1;
1813                         /* If changed and doing Present lookup, send Present UUIDs */
1814                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
1815                                 LDAP_SUCCESS ) {
1816                                 send_ldap_result( op, rs );
1817                                 return rs->sr_err;
1818                         }
1819                 }
1820         }
1821
1822 shortcut:
1823         /* Append CSN range to search filter, save original filter
1824          * for persistent search evaluation
1825          */
1826         if ( sop ) {
1827                 sop->s_filterstr= op->ors_filterstr;
1828         }
1829
1830         fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1831         fand->f_choice = LDAP_FILTER_AND;
1832         fand->f_next = NULL;
1833         fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1834         fava->f_choice = LDAP_FILTER_LE;
1835         fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1836         fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1837         ber_dupbv_x( &fava->f_ava->aa_value, &ctxcsn, op->o_tmpmemctx );
1838         fand->f_and = fava;
1839         if ( gotstate ) {
1840                 fava->f_next = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1841                 fava = fava->f_next;
1842                 fava->f_choice = LDAP_FILTER_GE;
1843                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1844                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1845                 ber_dupbv_x( &fava->f_ava->aa_value, srs->sr_state.ctxcsn, op->o_tmpmemctx );
1846         }
1847         fava->f_next = op->ors_filter;
1848         op->ors_filter = fand;
1849         filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1850
1851         /* Let our callback add needed info to returned entries */
1852         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1853         ss = (searchstate *)(cb+1);
1854         ss->ss_on = on;
1855         ss->ss_so = sop;
1856         ss->ss_present = do_present;
1857         cb->sc_response = syncprov_search_response;
1858         cb->sc_cleanup = syncprov_search_cleanup;
1859         cb->sc_private = ss;
1860         cb->sc_next = op->o_callback;
1861         op->o_callback = cb;
1862
1863 #if 0   /* I don't think we need to shortcircuit back-bdb any more */
1864         op->o_sync_mode &= SLAP_CONTROL_MASK;
1865 #endif
1866
1867         /* If this is a persistent search and no changes were reported during
1868          * the refresh phase, just invoke the response callback to transition
1869          * us into persist phase
1870          */
1871         if ( nochange ) {
1872                 rs->sr_err = LDAP_SUCCESS;
1873                 rs->sr_nentries = 0;
1874                 send_ldap_result( op, rs );
1875                 return rs->sr_err;
1876         }
1877         return SLAP_CB_CONTINUE;
1878 }
1879
1880 static int
1881 syncprov_operational(
1882         Operation *op,
1883         SlapReply *rs )
1884 {
1885         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1886         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1887
1888         if ( rs->sr_entry &&
1889                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
1890
1891                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
1892                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
1893                         Attribute *a, **ap = NULL;
1894
1895                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
1896                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
1897                                         break;
1898                         }
1899
1900                         if ( !a ) {
1901                                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next );
1902
1903                                 a = ch_malloc( sizeof(Attribute));
1904                                 a->a_desc = slap_schema.si_ad_contextCSN;
1905                                 a->a_vals = ch_malloc( 2 * sizeof(struct berval));
1906                                 a->a_vals[1].bv_val = NULL;
1907                                 a->a_nvals = a->a_vals;
1908                                 a->a_next = NULL;
1909                                 a->a_flags = 0;
1910                                 *ap = a;
1911                         }
1912
1913                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1914                         if ( !ap ) {
1915                                 strcpy( a->a_vals[0].bv_val, si->si_ctxcsnbuf );
1916                         } else {
1917                                 ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
1918                         }
1919                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1920                 }
1921         }
1922         return SLAP_CB_CONTINUE;
1923 }
1924
1925 static int
1926 syncprov_db_config(
1927         BackendDB       *be,
1928         const char      *fname,
1929         int             lineno,
1930         int             argc,
1931         char    **argv
1932 )
1933 {
1934         slap_overinst           *on = (slap_overinst *)be->bd_info;
1935         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1936
1937         if ( strcasecmp( argv[ 0 ], "syncprov-checkpoint" ) == 0 ) {
1938                 if ( argc != 3 ) {
1939                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
1940                                 "\"syncprov-checkpoint <ops> <minutes>\"\n", fname, lineno );
1941                         return -1;
1942                 }
1943                 si->si_chkops = atoi( argv[1] );
1944                 si->si_chktime = atoi( argv[2] ) * 60;
1945                 return 0;
1946
1947         } else if ( strcasecmp( argv[0], "syncprov-sessionlog" ) == 0 ) {
1948                 sessionlog *sl;
1949                 int sid, size;
1950                 if ( argc != 3 ) {
1951                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
1952                                 "\"syncprov-sessionlog <sid> <size>\"\n", fname, lineno );
1953                         return -1;
1954                 }
1955                 sid = atoi( argv[1] );
1956                 if ( sid < 0 || sid > 999 ) {
1957                         fprintf( stderr,
1958                                 "%s: line %d: session log id %d is out of range [0..999]\n",
1959                                 fname, lineno, sid );
1960                         return -1;
1961                 }
1962                 size = atoi( argv[2] );
1963                 if ( size < 0 ) {
1964                         fprintf( stderr,
1965                                 "%s: line %d: session log size %d is negative\n",
1966                                 fname, lineno, size );
1967                         return -1;
1968                 }
1969                 for ( sl = si->si_logs; sl; sl=sl->sl_next ) {
1970                         if ( sl->sl_sid == sid ) {
1971                                 sl->sl_size = size;
1972                                 break;
1973                         }
1974                 }
1975                 if ( !sl ) {
1976                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
1977                         sl->sl_mincsn.bv_val = (char *)(sl+1);
1978                         sl->sl_mincsn.bv_len = 0;
1979                         sl->sl_sid = sid;
1980                         sl->sl_size = size;
1981                         sl->sl_num = 0;
1982                         sl->sl_head = sl->sl_tail = NULL;
1983                         sl->sl_next = si->si_logs;
1984                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
1985                         si->si_logs = sl;
1986                 }
1987                 return 0;
1988         }
1989
1990         return SLAP_CONF_UNKNOWN;
1991 }
1992
1993 /* Cheating - we have no thread pool context for these functions,
1994  * so make one.
1995  */
1996 typedef struct thread_keys {
1997         void *key;
1998         void *data;
1999         ldap_pvt_thread_pool_keyfree_t *xfree;
2000 } thread_keys;
2001
2002 #define MAXKEYS 32
2003 /* A fake thread context */
2004 static thread_keys thrctx[MAXKEYS];
2005
2006 /* Read any existing contextCSN from the underlying db.
2007  * Then search for any entries newer than that. If no value exists,
2008  * just generate it. Cache whatever result.
2009  */
2010 static int
2011 syncprov_db_open(
2012     BackendDB *be
2013 )
2014 {
2015         slap_overinst   *on = (slap_overinst *) be->bd_info;
2016         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2017
2018         Connection conn;
2019         char opbuf[OPERATION_BUFFER_SIZE];
2020         char ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
2021         Operation *op = (Operation *)opbuf;
2022         Entry *e;
2023         Attribute *a;
2024         int rc;
2025
2026         connection_fake_init( &conn, op, thrctx );
2027         op->o_bd = be;
2028         op->o_dn = be->be_rootdn;
2029         op->o_ndn = be->be_rootndn;
2030
2031         ctxcsnbuf[0] = '\0';
2032
2033         op->o_bd->bd_info = on->on_info->oi_orig;
2034         rc = be_entry_get_rw( op, be->be_nsuffix, NULL,
2035                 slap_schema.si_ad_contextCSN, 0, &e );
2036
2037         if ( e ) {
2038                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2039                 if ( a ) {
2040                         si->si_ctxcsn.bv_len = a->a_nvals[0].bv_len;
2041                         if ( si->si_ctxcsn.bv_len >= sizeof(si->si_ctxcsnbuf ))
2042                                 si->si_ctxcsn.bv_len = sizeof(si->si_ctxcsnbuf)-1;
2043                         strncpy( si->si_ctxcsnbuf, a->a_nvals[0].bv_val,
2044                                 si->si_ctxcsn.bv_len );
2045                         si->si_ctxcsnbuf[si->si_ctxcsn.bv_len] = '\0';
2046                         strcpy( ctxcsnbuf, si->si_ctxcsnbuf );
2047                 }
2048                 be_entry_release_rw( op, e, 0 );
2049                 op->o_bd->bd_info = (BackendInfo *)on;
2050                 op->o_req_dn = be->be_suffix[0];
2051                 op->o_req_ndn = be->be_nsuffix[0];
2052                 op->ors_scope = LDAP_SCOPE_SUBTREE;
2053                 syncprov_findcsn( op, FIND_MAXCSN );
2054         }
2055
2056         if ( BER_BVISEMPTY( &si->si_ctxcsn ) ) {
2057                 slap_get_csn( op, si->si_ctxcsnbuf, sizeof(si->si_ctxcsnbuf),
2058                                 &si->si_ctxcsn, 0 );
2059         }
2060
2061         /* If our ctxcsn is different from what was read from the root
2062          * entry, write the new value out.
2063          */
2064         if ( strcmp( si->si_ctxcsnbuf, ctxcsnbuf )) {
2065                 SlapReply rs = {REP_RESULT};
2066                 syncprov_checkpoint( op, &rs, on );
2067         }
2068
2069         op->o_bd->bd_info = (BackendInfo *)on;
2070         return 0;
2071 }
2072
2073 /* Write the current contextCSN into the underlying db.
2074  */
2075 static int
2076 syncprov_db_close(
2077     BackendDB *be
2078 )
2079 {
2080     slap_overinst   *on = (slap_overinst *) be->bd_info;
2081     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2082         int i;
2083
2084         if ( si->si_numops ) {
2085                 Connection conn;
2086                 char opbuf[OPERATION_BUFFER_SIZE];
2087                 Operation *op = (Operation *)opbuf;
2088                 SlapReply rs = {REP_RESULT};
2089
2090                 connection_fake_init( &conn, op, thrctx );
2091                 op->o_bd = be;
2092                 op->o_dn = be->be_rootdn;
2093                 op->o_ndn = be->be_rootndn;
2094                 syncprov_checkpoint( op, &rs, on );
2095         }
2096         for ( i=0; thrctx[i].key; i++) {
2097                 if ( thrctx[i].xfree )
2098                         thrctx[i].xfree( thrctx[i].key, thrctx[i].data );
2099                 thrctx[i].key = NULL;
2100         }
2101
2102     return 0;
2103 }
2104
2105 static int
2106 syncprov_db_init(
2107         BackendDB *be
2108 )
2109 {
2110         slap_overinst   *on = (slap_overinst *)be->bd_info;
2111         syncprov_info_t *si;
2112
2113         si = ch_calloc(1, sizeof(syncprov_info_t));
2114         on->on_bi.bi_private = si;
2115         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
2116         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2117         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2118         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
2119
2120         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2121         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2122
2123         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2124         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2125
2126         return 0;
2127 }
2128
2129 static int
2130 syncprov_db_destroy(
2131         BackendDB *be
2132 )
2133 {
2134         slap_overinst   *on = (slap_overinst *)be->bd_info;
2135         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2136
2137         if ( si ) {
2138                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2139                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2140                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
2141                 ch_free( si );
2142         }
2143
2144         return 0;
2145 }
2146
2147 static int syncprov_parseCtrl (
2148         Operation *op,
2149         SlapReply *rs,
2150         LDAPControl *ctrl )
2151 {
2152         ber_tag_t tag;
2153         BerElement *ber;
2154         ber_int_t mode;
2155         ber_len_t len;
2156         struct berval cookie = BER_BVNULL;
2157         sync_control *sr;
2158         int rhint = 0;
2159
2160         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2161                 rs->sr_text = "Sync control specified multiple times";
2162                 return LDAP_PROTOCOL_ERROR;
2163         }
2164
2165         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2166                 rs->sr_text = "Sync control specified with pagedResults control";
2167                 return LDAP_PROTOCOL_ERROR;
2168         }
2169
2170         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2171                 rs->sr_text = "Sync control value is empty (or absent)";
2172                 return LDAP_PROTOCOL_ERROR;
2173         }
2174
2175         /* Parse the control value
2176          *      syncRequestValue ::= SEQUENCE {
2177          *              mode   ENUMERATED {
2178          *                      -- 0 unused
2179          *                      refreshOnly             (1),
2180          *                      -- 2 reserved
2181          *                      refreshAndPersist       (3)
2182          *              },
2183          *              cookie  syncCookie OPTIONAL
2184          *      }
2185          */
2186
2187         ber = ber_init( &ctrl->ldctl_value );
2188         if( ber == NULL ) {
2189                 rs->sr_text = "internal error";
2190                 return LDAP_OTHER;
2191         }
2192
2193         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2194                 rs->sr_text = "Sync control : mode decoding error";
2195                 return LDAP_PROTOCOL_ERROR;
2196         }
2197
2198         switch( mode ) {
2199         case LDAP_SYNC_REFRESH_ONLY:
2200                 mode = SLAP_SYNC_REFRESH;
2201                 break;
2202         case LDAP_SYNC_REFRESH_AND_PERSIST:
2203                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2204                 break;
2205         default:
2206                 rs->sr_text = "Sync control : unknown update mode";
2207                 return LDAP_PROTOCOL_ERROR;
2208         }
2209
2210         tag = ber_peek_tag( ber, &len );
2211
2212         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2213                 if (( ber_scanf( ber, /*{*/ "o", &cookie )) == LBER_ERROR ) {
2214                         rs->sr_text = "Sync control : cookie decoding error";
2215                         return LDAP_PROTOCOL_ERROR;
2216                 }
2217         }
2218         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2219                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2220                         rs->sr_text = "Sync control : rhint decoding error";
2221                         return LDAP_PROTOCOL_ERROR;
2222                 }
2223         }
2224         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2225                         rs->sr_text = "Sync control : decoding error";
2226                         return LDAP_PROTOCOL_ERROR;
2227         }
2228         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2229         sr->sr_rhint = rhint;
2230         if (!BER_BVISNULL(&cookie)) {
2231                 ber_bvarray_add( &sr->sr_state.octet_str, &cookie );
2232                 slap_parse_sync_cookie( &sr->sr_state );
2233         }
2234
2235         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2236
2237         (void) ber_free( ber, 1 );
2238
2239         op->o_sync = ctrl->ldctl_iscritical
2240                 ? SLAP_CONTROL_CRITICAL
2241                 : SLAP_CONTROL_NONCRITICAL;
2242
2243         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2244
2245         return LDAP_SUCCESS;
2246 }
2247
2248 /* This overlay is set up for dynamic loading via moduleload. For static
2249  * configuration, you'll need to arrange for the slap_overinst to be
2250  * initialized and registered by some other function inside slapd.
2251  */
2252
2253 static slap_overinst            syncprov;
2254
2255 int
2256 syncprov_init()
2257 {
2258         int rc;
2259
2260         rc = register_supported_control( LDAP_CONTROL_SYNC,
2261                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
2262                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2263         if ( rc != LDAP_SUCCESS ) {
2264                 fprintf( stderr, "Failed to register control %d\n", rc );
2265                 return rc;
2266         }
2267
2268         syncprov.on_bi.bi_type = "syncprov";
2269         syncprov.on_bi.bi_db_init = syncprov_db_init;
2270         syncprov.on_bi.bi_db_config = syncprov_db_config;
2271         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2272         syncprov.on_bi.bi_db_open = syncprov_db_open;
2273         syncprov.on_bi.bi_db_close = syncprov_db_close;
2274
2275         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2276         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2277
2278         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2279         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2280         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2281         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2282         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2283         syncprov.on_bi.bi_op_search = syncprov_op_search;
2284         syncprov.on_bi.bi_extended = syncprov_op_extended;
2285         syncprov.on_bi.bi_operational = syncprov_operational;
2286
2287         return overlay_register( &syncprov );
2288 }
2289
2290 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2291 int
2292 init_module( int argc, char *argv[] )
2293 {
2294         return syncprov_init();
2295 }
2296 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2297
2298 #endif /* defined(SLAPD_OVER_SYNCPROV) */