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

   1 /* syncprov.c - syncrepl provider */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 2004 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15 /* ACKNOWLEDGEMENTS:
  16  * This work was initially developed by Howard Chu for inclusion in
  17  * OpenLDAP Software.
  18  */
  19
  20 #include "portable.h"
  21
  22 #ifdef SLAPD_OVER_SYNCPROV
  23
  24 #include <ac/string.h>
  25 #include "lutil.h"
  26 #include "slap.h"
  27
  28 /* A modify request on a particular entry */
  29 typedef struct modinst {
  30         struct modinst *mi_next;
  31         Operation *mi_op;
  32 } modinst;
  33
  34 typedef struct modtarget {
  35         struct modinst *mt_mods;
  36         struct modinst *mt_tail;
  37         Operation *mt_op;
  38         ldap_pvt_thread_mutex_t mt_mutex;
  39 } modtarget;
  40
  41 /* A queued result of a persistent search */
  42 typedef struct syncres {
  43         struct syncres *s_next;
  44         struct berval s_dn;
  45         struct berval s_ndn;
  46         struct berval s_uuid;
  47         struct berval s_csn;
  48         char s_mode;
  49         char s_isreference;
  50 } syncres;
  51
  52 /* Record of a persistent search */
  53 typedef struct syncops {
  54         struct syncops *s_next;
  55         struct berval   s_base;         /* ndn of search base */
  56         ID              s_eid;          /* entryID of search base */
  57         Operation       *s_op;          /* search op */
  58         long    s_sid;
  59         long    s_rid;
  60         struct berval s_filterstr;
  61         int             s_flags;        /* search status */
  62         int             s_inuse;        /* reference count */
  63         struct syncres *s_res;
  64         struct syncres *s_restail;
  65         ldap_pvt_thread_mutex_t s_mutex;
  66 } syncops;
  67
  68 static int      sync_cid;
  69
  70 /* A received sync control */
  71 typedef struct sync_control {
  72         struct sync_cookie sr_state;
  73         int sr_rhint;
  74 } sync_control;
  75
  76 /* o_sync_mode uses data bits of o_sync */
  77 #define o_sync  o_ctrlflag[sync_cid]
  78 #define o_sync_mode     o_ctrlflag[sync_cid]
  79
  80 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  81 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  82 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  83 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  84
  85 #define PS_IS_REFRESHING        0x01
  86
  87 /* Record of which searches matched at premodify step */
  88 typedef struct syncmatches {
  89         struct syncmatches *sm_next;
  90         syncops *sm_op;
  91 } syncmatches;
  92
  93 /* The main state for this overlay */
  94 typedef struct syncprov_info_t {
  95         syncops         *si_ops;
  96         struct berval   si_ctxcsn;      /* ldapsync context */
  97         int             si_gotcsn;      /* is our ctxcsn up to date? */
  98         Avlnode *si_mods;       /* entries being modified */
  99         ldap_pvt_thread_mutex_t si_csn_mutex;
 100         ldap_pvt_thread_mutex_t si_ops_mutex;
 101         ldap_pvt_thread_mutex_t si_mods_mutex;
 102         char            si_ctxcsnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 103 } syncprov_info_t;
 104
 105 typedef struct opcookie {
 106         slap_overinst *son;
 107         syncmatches *smatches;
 108         struct berval sdn;      /* DN of entry, for deletes */
 109         struct berval sndn;
 110         struct berval suuid;    /* UUID of entry */
 111         struct berval sctxcsn;
 112         int sreference; /* Is the entry a reference? */
 113 } opcookie;
 114
 115 typedef struct fbase_cookie {
 116         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 117         syncops *fss;   /* persistent search we're testing against */
 118         int fbase;      /* if TRUE we found the search base and it's still valid */
 119         int fscope;     /* if TRUE then fdn is within the psearch scope */
 120 } fbase_cookie;
 121
 122 static AttributeName csn_anlist[2];
 123 static AttributeName uuid_anlist[2];
 124
 125 /* Build a LDAPsync intermediate state control */
 126 static int
 127 syncprov_state_ctrl(
 128         Operation       *op,
 129         SlapReply       *rs,
 130         Entry           *e,
 131         int                     entry_sync_state,
 132         LDAPControl     **ctrls,
 133         int                     num_ctrls,
 134         int                     send_cookie,
 135         struct berval   *cookie)
 136 {
 137         Attribute* a;
 138         int ret;
 139         int res;
 140         const char *text = NULL;
 141
 142         BerElementBuffer berbuf;
 143         BerElement *ber = (BerElement *)&berbuf;
 144
 145         struct berval entryuuid_bv      = BER_BVNULL;
 146
 147         ber_init2( ber, 0, LBER_USE_DER );
 148         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 149
 150         ctrls[num_ctrls] = slap_sl_malloc ( sizeof ( LDAPControl ), op->o_tmpmemctx );
 151
 152         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 153                 AttributeDescription *desc = a->a_desc;
 154                 if ( desc == slap_schema.si_ad_entryUUID ) {
 155                         entryuuid_bv = a->a_nvals[0];
 156                         break;
 157                 }
 158         }
 159
 160         if ( send_cookie && cookie ) {
 161                 ber_printf( ber, "{eOON}",
 162                         entry_sync_state, &entryuuid_bv, cookie );
 163         } else {
 164                 ber_printf( ber, "{eON}",
 165                         entry_sync_state, &entryuuid_bv );
 166         }
 167
 168         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 169         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 170         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 171
 172         ber_free_buf( ber );
 173
 174         if ( ret < 0 ) {
 175                 Debug( LDAP_DEBUG_TRACE,
 176                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 177                         0, 0, 0 );
 178                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 179                 return ret;
 180         }
 181
 182         return LDAP_SUCCESS;
 183 }
 184
 185 /* Build a LDAPsync final state control */
 186 static int
 187 syncprov_done_ctrl(
 188         Operation       *op,
 189         SlapReply       *rs,
 190         LDAPControl     **ctrls,
 191         int                     num_ctrls,
 192         int                     send_cookie,
 193         struct berval *cookie,
 194         int                     refreshDeletes )
 195 {
 196         int ret;
 197         BerElementBuffer berbuf;
 198         BerElement *ber = (BerElement *)&berbuf;
 199
 200         ber_init2( ber, NULL, LBER_USE_DER );
 201         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 202
 203         ctrls[num_ctrls] = ch_malloc ( sizeof ( LDAPControl ) );
 204
 205         ber_printf( ber, "{" );
 206         if ( send_cookie && cookie ) {
 207                 ber_printf( ber, "O", cookie );
 208         }
 209         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 210                 ber_printf( ber, "b", refreshDeletes );
 211         }
 212         ber_printf( ber, "N}" );
 213
 214         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 215         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 216         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 217
 218         ber_free_buf( ber );
 219
 220         if ( ret < 0 ) {
 221                 Debug( LDAP_DEBUG_TRACE,
 222                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 223                         0, 0, 0 );
 224                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 225                 return ret;
 226         }
 227
 228         return LDAP_SUCCESS;
 229 }
 230
 231 #if 0
 232 /* Generate state based on session log - not implemented yet */
 233 static int
 234 syncprov_state_ctrl_from_slog(
 235         Operation       *op,
 236         SlapReply       *rs,
 237         struct slog_entry *slog_e,
 238         int                     entry_sync_state,
 239         LDAPControl     **ctrls,
 240         int                     num_ctrls,
 241         int                     send_cookie,
 242         struct berval   *cookie)
 243 {
 244         Attribute* a;
 245         int ret;
 246         int res;
 247         const char *text = NULL;
 248
 249         BerElementBuffer berbuf;
 250         BerElement *ber = (BerElement *)&berbuf;
 251
 252         struct berval entryuuid_bv      = BER_BVNULL;
 253
 254         ber_init2( ber, NULL, LBER_USE_DER );
 255         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 256
 257         ctrls[num_ctrls] = ch_malloc ( sizeof ( LDAPControl ) );
 258
 259         entryuuid_bv = slog_e->sl_uuid;
 260
 261         if ( send_cookie && cookie ) {
 262                 ber_printf( ber, "{eOON}",
 263                         entry_sync_state, &entryuuid_bv, cookie );
 264         } else {
 265                 ber_printf( ber, "{eON}",
 266                         entry_sync_state, &entryuuid_bv );
 267         }
 268
 269         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 270         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 271         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 272
 273         ber_free_buf( ber );
 274
 275         if ( ret < 0 ) {
 276                 Debug( LDAP_DEBUG_TRACE,
 277                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 278                         0, 0, 0 );
 279                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 280                 return ret;
 281         }
 282
 283         return LDAP_SUCCESS;
 284 }
 285 #endif
 286
 287 static int
 288 syncprov_sendinfo(
 289         Operation       *op,
 290         SlapReply       *rs,
 291         int                     type,
 292         struct berval *cookie,
 293         int                     refreshDone,
 294         BerVarray       syncUUIDs,
 295         int                     refreshDeletes )
 296 {
 297         BerElementBuffer berbuf;
 298         BerElement *ber = (BerElement *)&berbuf;
 299         struct berval rspdata;
 300
 301         int ret;
 302
 303         ber_init2( ber, NULL, LBER_USE_DER );
 304         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 305
 306         if ( type ) {
 307                 switch ( type ) {
 308                 case LDAP_TAG_SYNC_NEW_COOKIE:
 309                         ber_printf( ber, "tO", type, cookie );
 310                         break;
 311                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 312                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 313                         ber_printf( ber, "t{", type );
 314                         if ( cookie ) {
 315                                 ber_printf( ber, "O", cookie );
 316                         }
 317                         if ( refreshDone == 0 ) {
 318                                 ber_printf( ber, "b", refreshDone );
 319                         }
 320                         ber_printf( ber, "N}" );
 321                         break;
 322                 case LDAP_TAG_SYNC_ID_SET:
 323                         ber_printf( ber, "t{", type );
 324                         if ( cookie ) {
 325                                 ber_printf( ber, "O", cookie );
 326                         }
 327                         if ( refreshDeletes == 1 ) {
 328                                 ber_printf( ber, "b", refreshDeletes );
 329                         }
 330                         ber_printf( ber, "[W]", syncUUIDs );
 331                         ber_printf( ber, "N}" );
 332                         break;
 333                 default:
 334                         Debug( LDAP_DEBUG_TRACE,
 335                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 336                                 type, 0, 0 );
 337                         return LDAP_OTHER;
 338                 }
 339         }
 340
 341         ret = ber_flatten2( ber, &rspdata, 0 );
 342
 343         if ( ret < 0 ) {
 344                 Debug( LDAP_DEBUG_TRACE,
 345                         "syncprov_sendinfo: ber_flatten2 failed\n",
 346                         0, 0, 0 );
 347                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 348                 return ret;
 349         }
 350
 351         rs->sr_rspoid = LDAP_SYNC_INFO;
 352         rs->sr_rspdata = &rspdata;
 353         send_ldap_intermediate( op, rs );
 354         rs->sr_rspdata = NULL;
 355         ber_free_buf( ber );
 356
 357         return LDAP_SUCCESS;
 358 }
 359
 360 /* Find a modtarget in an AVL tree */
 361 static int
 362 sp_avl_cmp( const void *c1, const void *c2 )
 363 {
 364         const modtarget *m1, *m2;
 365         int rc;
 366
 367         m1 = c1; m2 = c2;
 368         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 369
 370         if ( rc ) return rc;
 371         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 372 }
 373
 374 /* syncprov_findbase:
 375  *   finds the true DN of the base of a search (with alias dereferencing) and
 376  * checks to make sure the base entry doesn't get replaced with a different
 377  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 378  * change is detected, any persistent search on this base must be terminated /
 379  * reloaded.
 380  *   On the first call, we just save the DN and entryID. On subsequent calls
 381  * we compare the DN and entryID with the saved values.
 382  */
 383 static int
 384 findbase_cb( Operation *op, SlapReply *rs )
 385 {
 386         slap_callback *sc = op->o_callback;
 387
 388         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 389                 fbase_cookie *fc = sc->sc_private;
 390
 391                 /* If no entryID, we're looking for the first time.
 392                  * Just store whatever we got.
 393                  */
 394                 if ( fc->fss->s_eid == NOID ) {
 395                         fc->fbase = 1;
 396                         fc->fss->s_eid = rs->sr_entry->e_id;
 397                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 398
 399                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 400                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 401
 402                 /* OK, the DN is the same and the entryID is the same. Now
 403                  * see if the fdn resides in the scope.
 404                  */
 405                         fc->fbase = 1;
 406                         switch ( fc->fss->s_op->ors_scope ) {
 407                         case LDAP_SCOPE_BASE:
 408                                 fc->fscope = dn_match( fc->fdn, &rs->sr_entry->e_nname );
 409                                 break;
 410                         case LDAP_SCOPE_ONELEVEL: {
 411                                 struct berval pdn;
 412                                 dnParent( fc->fdn, &pdn );
 413                                 fc->fscope = dn_match( &pdn, &rs->sr_entry->e_nname );
 414                                 break; }
 415                         case LDAP_SCOPE_SUBTREE:
 416                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname );
 417                                 break;
 418 #ifdef LDAP_SCOPE_SUBORDINATE
 419                         case LDAP_SCOPE_SUBORDINATE:
 420                                 fc->fscope = dnIsSuffix( fc->fdn, &rs->sr_entry->e_nname ) &&
 421                                         !dn_match( fc->fdn, &rs->sr_entry->e_nname );
 422                                 break;
 423 #endif
 424                         }
 425                 }
 426         }
 427         return LDAP_SUCCESS;
 428 }
 429
 430 static int
 431 syncprov_findbase( Operation *op, fbase_cookie *fc )
 432 {
 433         opcookie *opc = op->o_callback->sc_private;
 434         slap_overinst *on = opc->son;
 435         syncprov_info_t         *si = on->on_bi.bi_private;
 436
 437         slap_callback cb = {0};
 438         Operation fop;
 439         SlapReply frs = { REP_RESULT };
 440         int rc;
 441
 442         fop = *op;
 443
 444         cb.sc_response = findbase_cb;
 445         cb.sc_private = fc;
 446
 447         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync mode */
 448         fop.o_callback = &cb;
 449         fop.o_tag = LDAP_REQ_SEARCH;
 450         fop.ors_scope = LDAP_SCOPE_BASE;
 451         fop.ors_deref = fc->fss->s_op->ors_deref;
 452         fop.ors_slimit = 1;
 453         fop.ors_tlimit = SLAP_NO_LIMIT;
 454         fop.ors_attrs = slap_anlist_no_attrs;
 455         fop.ors_attrsonly = 1;
 456         fop.ors_filter = fc->fss->s_op->ors_filter;
 457         fop.ors_filterstr = fc->fss->s_op->ors_filterstr;
 458
 459         fop.o_req_ndn = fc->fss->s_op->o_req_ndn;
 460
 461         fop.o_bd->bd_info = on->on_info->oi_orig;
 462         rc = fop.o_bd->be_search( &fop, &frs );
 463         fop.o_bd->bd_info = (BackendInfo *)on;
 464
 465         if ( fc->fbase ) return LDAP_SUCCESS;
 466
 467         /* If entryID has changed, then the base of this search has
 468          * changed. Invalidate the psearch.
 469          */
 470         return LDAP_NO_SUCH_OBJECT;
 471 }
 472
 473 /* syncprov_findcsn:
 474  *   This function has three different purposes, but they all use a search
 475  * that filters on entryCSN so they're combined here.
 476  * 1: when the current contextCSN is unknown (i.e., at server start time)
 477  * and a syncrepl search has arrived with a cookie, we search for all entries
 478  * with CSN >= the cookie CSN, and store the maximum as our contextCSN. Also,
 479  * we expect to find the cookie CSN in the search results, and note if we did
 480  * or not. If not, we assume the cookie is stale. (This may be too restrictive,
 481  * notice case 2.)
 482  *
 483  * 2: when the current contextCSN is known and we have a sync cookie, we search
 484  * for one entry with CSN <= the cookie CSN. (Used to search for =.) If an
 485  * entry is found, the cookie CSN is valid, otherwise it is stale. Case 1 is
 486  * considered a special case of case 2, and both are generally called the
 487  * "find CSN" task.
 488  *
 489  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 490  * CSN, and generate Present records for them. We always collect this result
 491  * in SyncID sets, even if there's only one match.
 492  */
 493 #define FIND_CSN        1
 494 #define FIND_PRESENT    2
 495
 496 typedef struct fcsn_cookie {
 497         struct berval maxcsn;
 498         int gotmatch;
 499 } fcsn_cookie;
 500
 501 static int
 502 findcsn_cb( Operation *op, SlapReply *rs )
 503 {
 504         slap_callback *sc = op->o_callback;
 505
 506         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 507                 /* If the private pointer is set, it points to an fcsn_cookie
 508                  * and we want to record the maxcsn and match state.
 509                  */
 510                 if ( sc->sc_private ) {
 511                         int i;
 512                         fcsn_cookie *fc = sc->sc_private;
 513                         sync_control *srs = op->o_controls[sync_cid];
 514                         Attribute *a = attr_find(rs->sr_entry->e_attrs,
 515                                 slap_schema.si_ad_entryCSN );
 516                         i = ber_bvcmp( &a->a_vals[0], srs->sr_state.ctxcsn );
 517                         if ( i == 0 ) fc->gotmatch = 1;
 518                         i = ber_bvcmp( &a->a_vals[0], &fc->maxcsn );
 519                         if ( i > 0 ) {
 520                                 fc->maxcsn.bv_len = a->a_vals[0].bv_len;
 521                                 strcpy(fc->maxcsn.bv_val, a->a_vals[0].bv_val );
 522                         }
 523                 } else {
 524                 /* Otherwise, if the private pointer is not set, we just
 525                  * want to know if any entry matched the filter.
 526                  */
 527                         sc->sc_private = (void *)1;
 528                 }
 529         }
 530         return LDAP_SUCCESS;
 531 }
 532
 533 /* Build a list of entryUUIDs for sending in a SyncID set */
 534
 535 typedef struct fpres_cookie {
 536         int num;
 537         BerVarray uuids;
 538 } fpres_cookie;
 539
 540 static int
 541 findpres_cb( Operation *op, SlapReply *rs )
 542 {
 543         slap_callback *sc = op->o_callback;
 544         fpres_cookie *pc = sc->sc_private;
 545         int ret = SLAP_CB_CONTINUE;
 546
 547         if ( rs->sr_type == REP_SEARCH ) {
 548                 ret = slap_build_syncUUID_set( op, &pc->uuids, rs->sr_entry );
 549                 if ( ret > 0 ) {
 550                         pc->num++;
 551                         ret = LDAP_SUCCESS;
 552                         if ( pc->num == SLAP_SYNCUUID_SET_SIZE ) {
 553                                 ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 554                                         0, pc->uuids, 0 );
 555                                 ber_bvarray_free_x( pc->uuids, op->o_tmpmemctx );
 556                                 pc->uuids = NULL;
 557                                 pc->num = 0;
 558                         }
 559                 } else {
 560                         ret = LDAP_OTHER;
 561                 }
 562         } else if ( rs->sr_type == REP_RESULT ) {
 563                 ret = rs->sr_err;
 564                 if ( pc->num ) {
 565                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 566                                 0, pc->uuids, 0 );
 567                         ber_bvarray_free_x( pc->uuids, op->o_tmpmemctx );
 568                         pc->uuids = NULL;
 569                         pc->num = 0;
 570                 }
 571         }
 572         return ret;
 573 }
 574
 575
 576 static int
 577 syncprov_findcsn( Operation *op, int mode )
 578 {
 579         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 580         syncprov_info_t         *si = on->on_bi.bi_private;
 581
 582         slap_callback cb = {0};
 583         Operation fop;
 584         SlapReply frs = { REP_RESULT };
 585         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 586         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 587         struct berval fbuf;
 588         Filter cf;
 589         AttributeAssertion eq;
 590         int rc;
 591         fcsn_cookie fcookie;
 592         fpres_cookie pcookie;
 593         int locked = 0;
 594         sync_control *srs = op->o_controls[sync_cid];
 595
 596         if ( srs->sr_state.ctxcsn->bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
 597                 return LDAP_OTHER;
 598         }
 599
 600         fop = *op;
 601         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 602
 603         fbuf.bv_val = buf;
 604         if ( mode == FIND_CSN ) {
 605                 if ( !si->si_gotcsn ) {
 606                         /* If we don't know the current ctxcsn, find it */
 607                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
 608                         locked = 1;
 609                 }
 610                 if ( !si->si_gotcsn ) {
 611                         cf.f_choice = LDAP_FILTER_GE;
 612                         fop.ors_attrsonly = 0;
 613                         fop.ors_attrs = csn_anlist;
 614                         fop.ors_slimit = SLAP_NO_LIMIT;
 615                         cb.sc_private = &fcookie;
 616                         fcookie.maxcsn.bv_val = cbuf;
 617                         fcookie.maxcsn.bv_len = 0;
 618                         fcookie.gotmatch = 0;
 619                         fbuf.bv_len = sprintf( buf, "(entryCSN>=%s)", srs->sr_state.ctxcsn->bv_val );
 620                 } else {
 621                         if ( locked ) {
 622                                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
 623                                 locked = 0;
 624                         }
 625                         cf.f_choice = LDAP_FILTER_LE;
 626                         fop.ors_attrsonly = 1;
 627                         fop.ors_attrs = slap_anlist_no_attrs;
 628                         fop.ors_slimit = 1;
 629                         cb.sc_private = NULL;
 630                         fbuf.bv_len = sprintf( buf, "(entryCSN<=%s)", srs->sr_state.ctxcsn->bv_val );
 631                 }
 632                 cb.sc_response = findcsn_cb;
 633
 634         } else if ( mode == FIND_PRESENT ) {
 635                 cf.f_choice = LDAP_FILTER_LE;
 636                 fop.ors_attrsonly = 0;
 637                 fop.ors_attrs = uuid_anlist;
 638                 fop.ors_slimit = SLAP_NO_LIMIT;
 639                 /* We want pure entries, not referrals */
 640                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 641                 cb.sc_private = &pcookie;
 642                 cb.sc_response = findpres_cb;
 643                 pcookie.num = 0;
 644                 pcookie.uuids = NULL;
 645                 fbuf.bv_len = sprintf( buf, "(entryCSN<=%s)", srs->sr_state.ctxcsn->bv_val );
 646         }
 647         cf.f_ava = &eq;
 648         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 649         cf.f_av_value = *srs->sr_state.ctxcsn;
 650         cf.f_next = NULL;
 651
 652         fop.o_callback = &cb;
 653         fop.ors_tlimit = SLAP_NO_LIMIT;
 654         fop.ors_filter = &cf;
 655         fop.ors_filterstr = fbuf;
 656
 657         fop.o_bd->bd_info = on->on_info->oi_orig;
 658         rc = fop.o_bd->be_search( &fop, &frs );
 659         fop.o_bd->bd_info = (BackendInfo *)on;
 660
 661         if ( mode == FIND_CSN ) {
 662                 if ( !si->si_gotcsn ) {
 663                         strcpy(si->si_ctxcsnbuf, fcookie.maxcsn.bv_val);
 664                         si->si_ctxcsn.bv_len = fcookie.maxcsn.bv_len;
 665                         si->si_gotcsn = 1;
 666                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
 667                         if ( fcookie.gotmatch ) return LDAP_SUCCESS;
 668
 669                 } else {
 670                         if ( cb.sc_private ) return LDAP_SUCCESS;
 671                 }
 672         } else if ( mode == FIND_PRESENT ) {
 673                 return LDAP_SUCCESS;
 674         }
 675
 676         /* If matching CSN was not found, invalidate the context. */
 677         return LDAP_NO_SUCH_OBJECT;
 678 }
 679
 680 /* Queue a persistent search response if still in Refresh stage */
 681 static int
 682 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 683 {
 684         syncres *sr;
 685
 686         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 687                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 688         sr->s_next = NULL;
 689         sr->s_dn.bv_val = (char *)(sr + 1);
 690         sr->s_mode = mode;
 691         sr->s_isreference = opc->sreference;
 692         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val, opc->sdn.bv_val );
 693         *(sr->s_ndn.bv_val++) = '\0';
 694         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val, opc->sndn.bv_val );
 695         *(sr->s_uuid.bv_val++) = '\0';
 696         sr->s_csn.bv_val = lutil_strcopy( sr->s_uuid.bv_val, opc->suuid.bv_val );
 697
 698         if ( !so->s_res ) {
 699                 so->s_res = sr;
 700         } else {
 701                 so->s_restail->s_next = sr;
 702         }
 703         so->s_restail = sr;
 704         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 705         return LDAP_SUCCESS;
 706 }
 707
 708 /* Send a persistent search response */
 709 static int
 710 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, Entry *e, int mode, int queue )
 711 {
 712         slap_overinst *on = opc->son;
 713         syncprov_info_t *si = on->on_bi.bi_private;
 714
 715         SlapReply rs = { REP_SEARCH };
 716         LDAPControl *ctrls[2];
 717         struct berval cookie;
 718         Entry e_uuid = {0};
 719         Attribute a_uuid = {0};
 720         Operation sop = *so->s_op;
 721         Opheader ohdr;
 722
 723         ohdr = *sop.o_hdr;
 724         sop.o_hdr = &ohdr;
 725         sop.o_tmpmemctx = op->o_tmpmemctx;
 726         sop.o_bd = op->o_bd;
 727         sop.o_controls = op->o_controls;
 728
 729         if ( queue && (so->s_flags & PS_IS_REFRESHING) ) {
 730                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 731                 if ( so->s_flags & PS_IS_REFRESHING )
 732                         return syncprov_qresp( opc, so, mode );
 733                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 734         }
 735
 736         ctrls[1] = NULL;
 737         slap_compose_sync_cookie( op, &cookie, &opc->sctxcsn,
 738                 so->s_sid, so->s_rid );
 739
 740         e_uuid.e_attrs = &a_uuid;
 741         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 742         a_uuid.a_nvals = &opc->suuid;
 743         rs.sr_err = syncprov_state_ctrl( &sop, &rs, &e_uuid,
 744                 mode, ctrls, 0, 1, &cookie );
 745
 746         rs.sr_entry = e;
 747         rs.sr_ctrls = ctrls;
 748         switch( mode ) {
 749         case LDAP_SYNC_ADD:
 750                 if ( opc->sreference ) {
 751                         rs.sr_ref = get_entry_referrals( &sop, e );
 752                         send_search_reference( &sop, &rs );
 753                         ber_bvarray_free( rs.sr_ref );
 754                         break;
 755                 }
 756                 /* fallthru */
 757         case LDAP_SYNC_MODIFY:
 758                 rs.sr_attrs = sop.ors_attrs;
 759                 send_search_entry( &sop, &rs );
 760                 break;
 761         case LDAP_SYNC_DELETE:
 762                 e_uuid.e_attrs = NULL;
 763                 e_uuid.e_name = opc->sdn;
 764                 e_uuid.e_nname = opc->sndn;
 765                 rs.sr_entry = &e_uuid;
 766                 if ( opc->sreference ) {
 767                         struct berval bv;
 768                         bv.bv_val = NULL;
 769                         bv.bv_len = 0;
 770                         rs.sr_ref = &bv;
 771                         send_search_reference( &sop, &rs );
 772                 } else {
 773                         send_search_entry( &sop, &rs );
 774                 }
 775                 break;
 776         default:
 777                 assert(0);
 778         }
 779         free( rs.sr_ctrls[0] );
 780         return rs.sr_err;
 781 }
 782
 783 static void
 784 syncprov_free_syncop( syncops *so )
 785 {
 786         syncres *sr, *srnext;
 787
 788         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 789         so->s_inuse--;
 790         if ( so->s_inuse > 0 ) {
 791                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 792                 return;
 793         }
 794         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 795         filter_free( so->s_op->ors_filter );
 796         ch_free( so->s_op );
 797         ch_free( so->s_base.bv_val );
 798         for ( sr=so->s_res; sr; sr=srnext ) {
 799                 srnext = sr->s_next;
 800                 ch_free( sr );
 801         }
 802         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 803         ch_free( so );
 804 }
 805
 806 static int
 807 syncprov_drop_psearch( syncops *so )
 808 {
 809         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
 810         so->s_op->o_conn->c_n_ops_executing--;
 811         so->s_op->o_conn->c_n_ops_completed++;
 812         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
 813         syncprov_free_syncop( so );
 814 }
 815
 816 static int
 817 syncprov_op_abandon( Operation *op, SlapReply *rs )
 818 {
 819         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 820         syncprov_info_t         *si = on->on_bi.bi_private;
 821         syncops *so, *soprev;
 822
 823         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 824         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
 825                 soprev=so, so=so->s_next ) {
 826                 if ( so->s_op->o_connid == op->o_connid &&
 827                         so->s_op->o_msgid == op->orn_msgid ) {
 828                                 so->s_op->o_abandon = 1;
 829                                 soprev->s_next = so->s_next;
 830                                 break;
 831                 }
 832         }
 833         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 834         if ( so ) {
 835                 /* Is this really a Cancel exop? */
 836                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
 837                         rs->sr_err = LDAP_CANCELLED;
 838                         send_ldap_result( so->s_op, rs );
 839                 }
 840                 syncprov_drop_psearch( so );
 841         }
 842         return SLAP_CB_CONTINUE;
 843 }
 844
 845 /* Find which persistent searches are affected by this operation */
 846 static void
 847 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
 848 {
 849         slap_overinst *on = opc->son;
 850         syncprov_info_t         *si = on->on_bi.bi_private;
 851
 852         fbase_cookie fc;
 853         syncops *ss, *sprev, *snext;
 854         Entry *e;
 855         Attribute *a;
 856         int rc;
 857         struct berval newdn;
 858
 859         fc.fdn = &op->o_req_ndn;
 860         /* compute new DN */
 861         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
 862                 struct berval pdn;
 863                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
 864                 else dnParent( fc.fdn, &pdn );
 865                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
 866                 fc.fdn = &newdn;
 867         }
 868         if ( op->o_tag != LDAP_REQ_ADD ) {
 869                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 870                 rc = be_entry_get_rw( op, fc.fdn, NULL, NULL, 0, &e );
 871                 op->o_bd->bd_info = (BackendInfo *)on;
 872                 if ( rc ) return;
 873         } else {
 874                 e = op->ora_e;
 875         }
 876
 877         if ( saveit ) {
 878                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
 879                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
 880                 opc->sreference = is_entry_referral( e );
 881         }
 882         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
 883                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
 884                 if ( a )
 885                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
 886         }
 887
 888         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
 889         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
 890                 sprev = ss, ss=snext)
 891         {
 892                 syncmatches *sm;
 893                 int found = 0;
 894
 895                 snext = ss->s_next;
 896                 /* validate base */
 897                 fc.fss = ss;
 898                 fc.fbase = 0;
 899                 fc.fscope = 0;
 900
 901                 /* If the base of the search is missing, signal a refresh */
 902                 rc = syncprov_findbase( op, &fc );
 903                 if ( rc != LDAP_SUCCESS ) {
 904                         SlapReply rs = {REP_RESULT};
 905                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
 906                                 "search base has changed" );
 907                         sprev->s_next = snext;
 908                         syncprov_drop_psearch( ss );
 909                         continue;
 910                 }
 911
 912                 /* If we're sending results now, look for this op in old matches */
 913                 if ( !saveit ) {
 914                         syncmatches *old;
 915                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
 916                                 old=sm, sm=sm->sm_next ) {
 917                                 if ( sm->sm_op == ss ) {
 918                                         found = 1;
 919                                         old->sm_next = sm->sm_next;
 920                                         op->o_tmpfree( sm, op->o_tmpmemctx );
 921                                         break;
 922                                 }
 923                         }
 924                 }
 925
 926                 /* check if current o_req_dn is in scope and matches filter */
 927                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
 928                         LDAP_COMPARE_TRUE ) {
 929                         if ( saveit ) {
 930                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
 931                                 sm->sm_next = opc->smatches;
 932                                 sm->sm_op = ss;
 933                                 ss->s_inuse++;
 934                                 opc->smatches = sm;
 935                         } else {
 936                                 /* if found send UPDATE else send ADD */
 937                                 syncprov_sendresp( op, opc, ss, e,
 938                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD, 1 );
 939                         }
 940                 } else if ( !saveit && found ) {
 941                         /* send DELETE */
 942                         syncprov_sendresp( op, opc, ss, NULL, LDAP_SYNC_DELETE, 1 );
 943                 }
 944         }
 945         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
 946         if ( op->o_tag != LDAP_REQ_ADD ) {
 947                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
 948                 be_entry_release_r( op, e );
 949                 op->o_bd->bd_info = (BackendInfo *)on;
 950         }
 951 }
 952
 953 static int
 954 syncprov_op_cleanup( Operation *op, SlapReply *rs )
 955 {
 956         slap_callback *cb = op->o_callback;
 957         opcookie *opc = cb->sc_private;
 958         slap_overinst *on = opc->son;
 959         syncprov_info_t         *si = on->on_bi.bi_private;
 960         syncmatches *sm, *snext;
 961         modtarget *mt, mtdummy;
 962
 963         for (sm = opc->smatches; sm; sm=snext) {
 964                 snext = sm->sm_next;
 965                 syncprov_free_syncop( sm->sm_op );
 966                 op->o_tmpfree( sm, op->o_tmpmemctx );
 967         }
 968
 969         /* Remove op from lock table */
 970         mtdummy.mt_op = op;
 971         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
 972         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
 973         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
 974         if ( mt ) {
 975                 modinst *mi = mt->mt_mods;
 976
 977                 /* If there are more, promote the next one */
 978                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
 979                 if ( mi->mi_next ) {
 980                         mt->mt_mods = mi->mi_next;
 981                         mt->mt_op = mt->mt_mods->mi_op;
 982                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
 983                 } else {
 984                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
 985                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
 986                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
 987                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
 988                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
 989                         ch_free( mt );
 990                 }
 991         }
 992         op->o_callback = cb->sc_next;
 993         op->o_tmpfree(cb, op->o_tmpmemctx);
 994 }
 995
 996 static int
 997 syncprov_op_response( Operation *op, SlapReply *rs )
 998 {
 999         opcookie *opc = op->o_callback->sc_private;
1000         slap_overinst *on = opc->son;
1001         syncprov_info_t         *si = on->on_bi.bi_private;
1002         syncmatches *sm;
1003
1004         if ( rs->sr_err == LDAP_SUCCESS )
1005         {
1006                 struct berval maxcsn;
1007                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1008
1009                 /* Update our context CSN */
1010                 cbuf[0] = '\0';
1011                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1012                 slap_get_commit_csn( op, &maxcsn );
1013                 if ( maxcsn.bv_val ) {
1014                         strcpy( cbuf, maxcsn.bv_val );
1015                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {
1016                                 strcpy( si->si_ctxcsnbuf, cbuf );
1017                                 si->si_ctxcsn.bv_len = maxcsn.bv_len;
1018                         }
1019                         si->si_gotcsn = 1;
1020                 }
1021                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1022
1023                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1024                 opc->sctxcsn.bv_val = cbuf;
1025
1026                 /* Handle any persistent searches */
1027                 if ( si->si_ops ) {
1028                         switch(op->o_tag) {
1029                         case LDAP_REQ_ADD:
1030                         case LDAP_REQ_MODIFY:
1031                         case LDAP_REQ_MODRDN:
1032                         case LDAP_REQ_EXTENDED:
1033                                 syncprov_matchops( op, opc, 0 );
1034                                 break;
1035                         case LDAP_REQ_DELETE:
1036                                 /* for each match in opc->smatches:
1037                                  *   send DELETE msg
1038                                  */
1039                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1040                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1041                                         if ( sm->sm_op->s_op->o_abandon )
1042                                                 continue;
1043                                         syncprov_sendresp( op, opc, sm->sm_op, NULL,
1044                                                 LDAP_SYNC_DELETE, 1 );
1045                                 }
1046                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1047                                 break;
1048                         }
1049                 }
1050
1051         }
1052         return SLAP_CB_CONTINUE;
1053 }
1054
1055 /* We don't use a subentry to store the context CSN any more.
1056  * We expose the current context CSN as an operational attribute
1057  * of the suffix entry.
1058  */
1059 static int
1060 syncprov_op_compare( Operation *op, SlapReply *rs )
1061 {
1062         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1063         syncprov_info_t         *si = on->on_bi.bi_private;
1064         int rc = SLAP_CB_CONTINUE;
1065
1066         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1067                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1068         {
1069                 Entry e = {0};
1070                 Attribute a = {0};
1071                 struct berval bv[2];
1072
1073                 e.e_name = op->o_bd->be_suffix[0];
1074                 e.e_nname = op->o_bd->be_nsuffix[0];
1075
1076                 bv[1].bv_val = NULL;
1077                 bv[0] = si->si_ctxcsn;
1078
1079                 a.a_desc = slap_schema.si_ad_contextCSN;
1080                 a.a_vals = bv;
1081                 a.a_nvals = a.a_vals;
1082
1083                 ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1084
1085                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1086                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1087                 if ( ! rs->sr_err ) {
1088                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1089                         goto return_results;
1090                 }
1091
1092                 if ( get_assert( op ) &&
1093                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1094                 {
1095                         rs->sr_err = LDAP_ASSERTION_FAILED;
1096                         goto return_results;
1097                 }
1098
1099
1100                 rs->sr_err = LDAP_COMPARE_FALSE;
1101
1102                 if ( value_find_ex( op->oq_compare.rs_ava->aa_desc,
1103                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1104                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1105                                 a.a_nvals, &op->oq_compare.rs_ava->aa_value, op->o_tmpmemctx ) == 0 )
1106                 {
1107                         rs->sr_err = LDAP_COMPARE_TRUE;
1108                 }
1109
1110 return_results:;
1111
1112                 ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1113
1114                 send_ldap_result( op, rs );
1115
1116                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1117                         rs->sr_err = LDAP_SUCCESS;
1118                 }
1119                 rc = rs->sr_err;
1120         }
1121
1122         return rc;
1123 }
1124
1125 static int
1126 syncprov_op_mod( Operation *op, SlapReply *rs )
1127 {
1128         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1129         syncprov_info_t         *si = on->on_bi.bi_private;
1130
1131         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1132                 sizeof(opcookie) +
1133                 (si->si_ops ? sizeof(modinst) : 0 ),
1134                 op->o_tmpmemctx);
1135         opcookie *opc = (opcookie *)(cb+1);
1136         opc->son = on;
1137         cb->sc_response = syncprov_op_response;
1138         cb->sc_cleanup = syncprov_op_cleanup;
1139         cb->sc_private = opc;
1140         cb->sc_next = op->o_callback;
1141         op->o_callback = cb;
1142
1143         /* If there are active persistent searches, lock this operation.
1144          * See seqmod.c for the locking logic on its own.
1145          */
1146         if ( si->si_ops ) {
1147                 modtarget *mt, mtdummy;
1148                 modinst *mi;
1149
1150                 mi = (modinst *)(opc+1);
1151                 mi->mi_op = op;
1152
1153                 /* See if we're already modifying this entry... */
1154                 mtdummy.mt_op = op;
1155                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1156                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1157                 if ( mt ) {
1158                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1159                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1160                         mt->mt_tail->mi_next = mi;
1161                         mt->mt_tail = mi;
1162                         /* wait for this op to get to head of list */
1163                         while ( mt->mt_mods != mi ) {
1164                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1165                                 ldap_pvt_thread_yield();
1166                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1167                         }
1168                 } else {
1169                         /* Record that we're modifying this entry now */
1170                         mt = malloc( sizeof(modtarget) );
1171                         mt->mt_mods = mi;
1172                         mt->mt_tail = mi;
1173                         mt->mt_op = mi->mi_op;
1174                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1175                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1176                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1177                 }
1178
1179                 if ( op->o_tag != LDAP_REQ_ADD )
1180                         syncprov_matchops( op, opc, 1 );
1181         }
1182
1183         return SLAP_CB_CONTINUE;
1184 }
1185
1186 static int
1187 syncprov_op_extended( Operation *op, SlapReply *rs )
1188 {
1189         if ( exop_is_write( op ))
1190                 return syncprov_op_mod( op, rs );
1191
1192         return SLAP_CB_CONTINUE;
1193 }
1194
1195 typedef struct searchstate {
1196         slap_overinst *ss_on;
1197         syncops *ss_so;
1198 } searchstate;
1199
1200 static int
1201 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1202 {
1203         searchstate *ss = op->o_callback->sc_private;
1204         if ( rs->sr_ctrls ) {
1205                 free( rs->sr_ctrls[0] );
1206                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1207         }
1208         return 0;
1209 }
1210
1211 static void
1212 syncprov_detach_op( Operation *op, syncops *so )
1213 {
1214         Operation *op2;
1215         int i, alen = 0;
1216         size_t size;
1217         char *ptr;
1218
1219         /* count the search attrs */
1220         for (i=0; op->ors_attrs && op->ors_attrs[i].an_name.bv_val; i++) {
1221                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1222         }
1223         /* Make a new copy of the operation */
1224         size = sizeof(Operation) + sizeof(Opheader) +
1225                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1226                 op->o_req_dn.bv_len + 1 +
1227                 op->o_req_ndn.bv_len + 1 +
1228                 op->o_ndn.bv_len + 1 +
1229                 so->s_filterstr.bv_len + 1;
1230         op2 = (Operation *)ch_malloc( size );
1231         *op2 = *op;
1232         op2->o_hdr = (Opheader *)(op2+1);
1233         *op2->o_hdr = *op->o_hdr;
1234         if ( i ) {
1235                 op2->ors_attrs = (AttributeName *)(op2->o_hdr + 1);
1236                 ptr = (char *)(op2->ors_attrs+i+1);
1237                 for (i=0; op->ors_attrs[i].an_name.bv_val; i++) {
1238                         op2->ors_attrs[i] = op->ors_attrs[i];
1239                         op2->ors_attrs[i].an_name.bv_val = ptr;
1240                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1241                 }
1242                 op2->ors_attrs[i].an_name.bv_val = NULL;
1243                 op2->ors_attrs[i].an_name.bv_len = 0;
1244         } else {
1245                 ptr = (char *)(op2->o_hdr + 1);
1246         }
1247         op2->o_ndn.bv_val = ptr;
1248         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1249         op2->o_dn = op2->o_ndn;
1250         op2->o_req_dn.bv_val = ptr;
1251         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1252         op2->o_req_ndn.bv_val = ptr;
1253         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1254         op2->ors_filterstr.bv_val = ptr;
1255         strcpy( ptr, so->s_filterstr.bv_val );
1256         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1257         op2->ors_filter = str2filter( ptr );
1258         op2->o_controls = NULL;
1259         op2->o_callback = NULL;
1260         so->s_op = op2;
1261
1262         /* Increment number of ops so that idletimeout ignores us */
1263         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1264         op->o_conn->c_n_ops_executing++;
1265         op->o_conn->c_n_ops_completed--;
1266         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1267 }
1268
1269 static int
1270 syncprov_search_response( Operation *op, SlapReply *rs )
1271 {
1272         searchstate *ss = op->o_callback->sc_private;
1273         slap_overinst *on = ss->ss_on;
1274         syncprov_info_t         *si = on->on_bi.bi_private;
1275         sync_control *srs = op->o_controls[sync_cid];
1276
1277         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1278                 int i;
1279                 if ( srs->sr_state.ctxcsn ) {
1280                         Attribute *a = attr_find( rs->sr_entry->e_attrs,
1281                                 slap_schema.si_ad_entryCSN );
1282                         /* Don't send the ctx entry twice */
1283                         if ( bvmatch( &a->a_nvals[0], srs->sr_state.ctxcsn ))
1284                                 return LDAP_SUCCESS;
1285                 }
1286                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1287                         op->o_tmpmemctx );
1288                 rs->sr_ctrls[1] = NULL;
1289                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1290                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1291         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1292                 struct berval cookie;
1293
1294                 slap_compose_sync_cookie( op, &cookie,
1295                         &op->ors_filter->f_and->f_ava->aa_value,
1296                         srs->sr_state.sid, srs->sr_state.rid );
1297
1298                 /* Is this a regular refresh? */
1299                 if ( !ss->ss_so ) {
1300                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1301                                 op->o_tmpmemctx );
1302                         rs->sr_ctrls[1] = NULL;
1303                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1304                                 0, 1, &cookie, LDAP_SYNC_REFRESH_PRESENTS );
1305                 } else {
1306                         int locked = 0;
1307                 /* It's RefreshAndPersist, transition to Persist phase */
1308                         syncprov_sendinfo( op, rs, rs->sr_nentries ?
1309                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
1310                                 &cookie, 1, NULL, 0 );
1311                         /* Flush any queued persist messages */
1312                         if ( ss->ss_so->s_res ) {
1313                                 syncres *sr, *srnext;
1314                                 Entry *e;
1315                                 opcookie opc;
1316
1317                                 opc.son = on;
1318                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
1319                                 locked = 1;
1320                                 for (sr = ss->ss_so->s_res; sr; sr=srnext) {
1321                                         int rc = LDAP_SUCCESS;
1322                                         srnext = sr->s_next;
1323                                         opc.sdn = sr->s_dn;
1324                                         opc.sndn = sr->s_ndn;
1325                                         opc.suuid = sr->s_uuid;
1326                                         opc.sctxcsn = sr->s_csn;
1327                                         opc.sreference = sr->s_isreference;
1328                                         e = NULL;
1329
1330                                         if ( sr->s_mode != LDAP_SYNC_DELETE ) {
1331                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1332                                                 rc = be_entry_get_rw( op, &opc.sndn, NULL, NULL, 0, &e );
1333                                                 op->o_bd->bd_info = (BackendInfo *)on;
1334                                         }
1335                                         if ( rc == LDAP_SUCCESS )
1336                                                 syncprov_sendresp( op, &opc, ss->ss_so, e,
1337                                                         sr->s_mode, 0 );
1338
1339                                         if ( e ) {
1340                                                 op->o_bd->bd_info = (BackendInfo *)on->on_info;
1341                                                 be_entry_release_r( op, e );
1342                                                 op->o_bd->bd_info = (BackendInfo *)on;
1343                                         }
1344                                         ch_free( sr );
1345                                 }
1346                                 ss->ss_so->s_res = NULL;
1347                                 ss->ss_so->s_restail = NULL;
1348                         }
1349
1350                         /* Turn off the refreshing flag */
1351                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
1352                         if ( locked )
1353                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
1354
1355                         /* Detach this Op from frontend control */
1356                         syncprov_detach_op( op, ss->ss_so );
1357
1358                         return LDAP_SUCCESS;
1359                 }
1360         }
1361
1362         return SLAP_CB_CONTINUE;
1363 }
1364
1365 static int
1366 syncprov_op_search( Operation *op, SlapReply *rs )
1367 {
1368         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1369         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1370         slap_callback   *cb;
1371         int gotstate = 0, nochange = 0;
1372         Filter *fand, *fava;
1373         syncops *sop = NULL;
1374         searchstate *ss;
1375         sync_control *srs;
1376
1377         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
1378
1379         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
1380                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
1381                 return rs->sr_err;
1382         }
1383
1384         srs = op->o_controls[sync_cid];
1385
1386         /* If this is a persistent search, set it up right away */
1387         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
1388                 syncops so = {0};
1389                 fbase_cookie fc;
1390                 opcookie opc;
1391                 slap_callback sc;
1392
1393                 fc.fss = &so;
1394                 fc.fbase = 0;
1395                 so.s_eid = NOID;
1396                 so.s_op = op;
1397                 so.s_flags = PS_IS_REFRESHING;
1398                 /* syncprov_findbase expects to be called as a callback... */
1399                 sc.sc_private = &opc;
1400                 opc.son = on;
1401                 cb = op->o_callback;
1402                 op->o_callback = &sc;
1403                 rs->sr_err = syncprov_findbase( op, &fc );
1404                 op->o_callback = cb;
1405
1406                 if ( rs->sr_err != LDAP_SUCCESS ) {
1407                         send_ldap_result( op, rs );
1408                         return rs->sr_err;
1409                 }
1410                 sop = ch_malloc( sizeof( syncops ));
1411                 *sop = so;
1412                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
1413                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1414                 sop->s_sid = srs->sr_state.sid;
1415                 sop->s_rid = srs->sr_state.rid;
1416                 sop->s_next = si->si_ops;
1417                 sop->s_inuse = 1;
1418                 si->si_ops = sop;
1419                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1420         }
1421
1422         /* If we have a cookie, handle the PRESENT lookups
1423          */
1424         if ( srs->sr_state.ctxcsn ) {
1425                 /* Is the CSN in a valid format? */
1426                 if ( srs->sr_state.ctxcsn->bv_len >= LDAP_LUTIL_CSNSTR_BUFSIZE ) {
1427                         send_ldap_error( op, rs, LDAP_OTHER, "invalid sync cookie" );
1428                         return rs->sr_err;
1429                 }
1430                 /* Is the CSN still present in the database? */
1431                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
1432                         /* No, so a reload is required */
1433 #if 0           /* the consumer doesn't seem to send this hint */
1434                         if ( op->o_sync_rhint == 0 ) {
1435                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
1436                                 return rs->sr_err;
1437                         }
1438 #endif
1439                 } else {
1440                         gotstate = 1;
1441                         /* If just Refreshing and nothing has changed, shortcut it */
1442                         if ( bvmatch( srs->sr_state.ctxcsn, &si->si_ctxcsn )) {
1443                                 nochange = 1;
1444                                 if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
1445                                         LDAPControl     *ctrls[2];
1446
1447                                         ctrls[0] = NULL;
1448                                         ctrls[1] = NULL;
1449                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
1450                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
1451                                         rs->sr_ctrls = ctrls;
1452                                         rs->sr_err = LDAP_SUCCESS;
1453                                         send_ldap_result( op, rs );
1454                                         return rs->sr_err;
1455                                 }
1456                                 goto shortcut;
1457                         } else
1458                         /* If context has changed, check for Present UUIDs */
1459                         if ( syncprov_findcsn( op, FIND_PRESENT ) != LDAP_SUCCESS ) {
1460                                 send_ldap_result( op, rs );
1461                                 return rs->sr_err;
1462                         }
1463                 }
1464         }
1465
1466         /* If we didn't get a cookie and we don't know our contextcsn, try to
1467          * find it anyway.
1468          */
1469         if ( !gotstate && !si->si_gotcsn ) {
1470                 struct berval bv = BER_BVC("1"), *old;
1471
1472                 old = srs->sr_state.ctxcsn;
1473                 srs->sr_state.ctxcsn = &bv;
1474                 syncprov_findcsn( op, FIND_CSN );
1475                 srs->sr_state.ctxcsn = old;
1476         }
1477
1478         /* Append CSN range to search filter, save original filter
1479          * for persistent search evaluation
1480          */
1481         if ( sop ) {
1482                 sop->s_filterstr= op->ors_filterstr;
1483         }
1484
1485         fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1486         fand->f_choice = LDAP_FILTER_AND;
1487         fand->f_next = NULL;
1488         fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1489         fava->f_choice = LDAP_FILTER_LE;
1490         fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1491         fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1492         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1493         ber_dupbv_x( &fava->f_ava->aa_value, &si->si_ctxcsn, op->o_tmpmemctx );
1494         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1495         fand->f_and = fava;
1496         if ( gotstate ) {
1497                 fava->f_next = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
1498                 fava = fava->f_next;
1499                 fava->f_choice = LDAP_FILTER_GE;
1500                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
1501                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
1502                 ber_dupbv_x( &fava->f_ava->aa_value, srs->sr_state.ctxcsn, op->o_tmpmemctx );
1503         }
1504         fava->f_next = op->ors_filter;
1505         op->ors_filter = fand;
1506         filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
1507
1508 shortcut:
1509         /* Let our callback add needed info to returned entries */
1510         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
1511         ss = (searchstate *)(cb+1);
1512         ss->ss_on = on;
1513         ss->ss_so = sop;
1514         cb->sc_response = syncprov_search_response;
1515         cb->sc_cleanup = syncprov_search_cleanup;
1516         cb->sc_private = ss;
1517         cb->sc_next = op->o_callback;
1518         op->o_callback = cb;
1519
1520         op->o_sync_mode &= SLAP_CONTROL_MASK;
1521
1522         /* If this is a persistent search and no changes were reported during
1523          * the refresh phase, just invoke the response callback to transition
1524          * us into persist phase
1525          */
1526         if ( nochange ) {
1527                 rs->sr_err = LDAP_SUCCESS;
1528                 rs->sr_nentries = 0;
1529                 send_ldap_result( op, rs );
1530                 return rs->sr_err;
1531         }
1532         return SLAP_CB_CONTINUE;
1533 }
1534
1535 static int
1536 syncprov_operational(
1537         Operation *op,
1538         SlapReply *rs )
1539 {
1540         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1541         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1542
1543         if ( rs->sr_entry &&
1544                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
1545
1546                 Attribute **ap;
1547
1548                 for ( ap = &rs->sr_operational_attrs; *ap; ap=&(*ap)->a_next ) ;
1549
1550                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
1551                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
1552
1553                         Attribute *a = ch_malloc( sizeof(Attribute));
1554                         a->a_desc = slap_schema.si_ad_contextCSN;
1555                         a->a_vals = ch_malloc( 2 * sizeof(struct berval));
1556
1557                         ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
1558                         ber_dupbv( &a->a_vals[0], &si->si_ctxcsn );
1559                         ldap_pvt_thread_mutex_unlock( &si->si_csn_mutex );
1560
1561                         a->a_vals[1].bv_val = NULL;
1562                         a->a_nvals = a->a_vals;
1563                         a->a_next = NULL;
1564                         a->a_flags = 0;
1565
1566                         *ap = a;
1567                 }
1568         }
1569         return LDAP_SUCCESS;
1570 }
1571
1572 static int
1573 syncprov_db_config(
1574         BackendDB       *be,
1575         const char      *fname,
1576         int             lineno,
1577         int             argc,
1578         char    **argv
1579 )
1580 {
1581         slap_overinst           *on = (slap_overinst *)be->bd_info;
1582         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
1583
1584 #if 0
1585         if ( strcasecmp( argv[ 0 ], "syncprov-checkpoint" ) == 0 ) {
1586                 if ( argc != 3 ) {
1587                         fprintf( stderr, "%s: line %d: wrong number of arguments in "
1588                                 "\"syncprov-checkpoint <ops> <minutes>\"\n", fname, lineno );
1589                         return -1;
1590                 }
1591                 si->si_chkops = atoi( argv[1] );
1592                 si->si_chktime = atoi( argv[2] ) * 60;
1593
1594         } else {
1595                 return SLAP_CONF_UNKNOWN;
1596         }
1597 #endif
1598
1599         return SLAP_CONF_UNKNOWN;
1600 }
1601
1602 static int
1603 syncprov_db_init(
1604         BackendDB *be
1605 )
1606 {
1607         slap_overinst   *on = (slap_overinst *)be->bd_info;
1608         syncprov_info_t *si;
1609
1610         si = ch_calloc(1, sizeof(syncprov_info_t));
1611         on->on_bi.bi_private = si;
1612         ldap_pvt_thread_mutex_init( &si->si_csn_mutex );
1613         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
1614         si->si_ctxcsn.bv_val = si->si_ctxcsnbuf;
1615
1616         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
1617         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
1618
1619         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
1620         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
1621
1622         return 0;
1623 }
1624
1625 static int
1626 syncprov_db_destroy(
1627         BackendDB *be
1628 )
1629 {
1630         slap_overinst   *on = (slap_overinst *)be->bd_info;
1631         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1632
1633         if ( si ) {
1634                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
1635                 ldap_pvt_thread_mutex_destroy( &si->si_csn_mutex );
1636                 ch_free( si );
1637         }
1638
1639         return 0;
1640 }
1641
1642 static int syncprov_parseCtrl (
1643         Operation *op,
1644         SlapReply *rs,
1645         LDAPControl *ctrl )
1646 {
1647         ber_tag_t tag;
1648         BerElement *ber;
1649         ber_int_t mode;
1650         ber_len_t len;
1651         struct berval cookie = BER_BVNULL;
1652         sync_control *sr;
1653         int rhint = 0;
1654
1655         if ( op->o_sync != SLAP_CONTROL_NONE ) {
1656                 rs->sr_text = "Sync control specified multiple times";
1657                 return LDAP_PROTOCOL_ERROR;
1658         }
1659
1660         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
1661                 rs->sr_text = "Sync control specified with pagedResults control";
1662                 return LDAP_PROTOCOL_ERROR;
1663         }
1664
1665         if ( ctrl->ldctl_value.bv_len == 0 ) {
1666                 rs->sr_text = "Sync control value is empty (or absent)";
1667                 return LDAP_PROTOCOL_ERROR;
1668         }
1669
1670         /* Parse the control value
1671          *      syncRequestValue ::= SEQUENCE {
1672          *              mode   ENUMERATED {
1673          *                      -- 0 unused
1674          *                      refreshOnly             (1),
1675          *                      -- 2 reserved
1676          *                      refreshAndPersist       (3)
1677          *              },
1678          *              cookie  syncCookie OPTIONAL
1679          *      }
1680          */
1681
1682         ber = ber_init( &ctrl->ldctl_value );
1683         if( ber == NULL ) {
1684                 rs->sr_text = "internal error";
1685                 return LDAP_OTHER;
1686         }
1687
1688         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
1689                 rs->sr_text = "Sync control : mode decoding error";
1690                 return LDAP_PROTOCOL_ERROR;
1691         }
1692
1693         switch( mode ) {
1694         case LDAP_SYNC_REFRESH_ONLY:
1695                 mode = SLAP_SYNC_REFRESH;
1696                 break;
1697         case LDAP_SYNC_REFRESH_AND_PERSIST:
1698                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
1699                 break;
1700         default:
1701                 rs->sr_text = "Sync control : unknown update mode";
1702                 return LDAP_PROTOCOL_ERROR;
1703         }
1704
1705         tag = ber_peek_tag( ber, &len );
1706
1707         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
1708                 if (( ber_scanf( ber, /*{*/ "o", &cookie )) == LBER_ERROR ) {
1709                         rs->sr_text = "Sync control : cookie decoding error";
1710                         return LDAP_PROTOCOL_ERROR;
1711                 }
1712         }
1713         if ( tag == LDAP_TAG_RELOAD_HINT ) {
1714                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
1715                         rs->sr_text = "Sync control : rhint decoding error";
1716                         return LDAP_PROTOCOL_ERROR;
1717                 }
1718         }
1719         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
1720                         rs->sr_text = "Sync control : decoding error";
1721                         return LDAP_PROTOCOL_ERROR;
1722         }
1723         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
1724         sr->sr_rhint = rhint;
1725         if (!BER_BVISNULL(&cookie)) {
1726                 ber_bvarray_add( &sr->sr_state.octet_str, &cookie );
1727                 slap_parse_sync_cookie( &sr->sr_state );
1728         }
1729
1730         op->o_controls[sync_cid] = sr;
1731
1732         (void) ber_free( ber, 1 );
1733
1734         op->o_sync = ctrl->ldctl_iscritical
1735                 ? SLAP_CONTROL_CRITICAL
1736                 : SLAP_CONTROL_NONCRITICAL;
1737
1738         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
1739
1740         return LDAP_SUCCESS;
1741 }
1742
1743 /* This overlay is set up for dynamic loading via moduleload. For static
1744  * configuration, you'll need to arrange for the slap_overinst to be
1745  * initialized and registered by some other function inside slapd.
1746  */
1747
1748 static slap_overinst            syncprov;
1749
1750 int
1751 syncprov_init()
1752 {
1753         int rc;
1754
1755         rc = register_supported_control( LDAP_CONTROL_SYNC,
1756                 SLAP_CTRL_HIDE|SLAP_CTRL_SEARCH, NULL,
1757                 syncprov_parseCtrl, &sync_cid );
1758         if ( rc != LDAP_SUCCESS ) {
1759                 fprintf( stderr, "Failed to register control %d\n", rc );
1760                 return rc;
1761         }
1762
1763         syncprov.on_bi.bi_type = "syncprov";
1764         syncprov.on_bi.bi_db_init = syncprov_db_init;
1765         syncprov.on_bi.bi_db_config = syncprov_db_config;
1766         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
1767
1768         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
1769         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
1770
1771         syncprov.on_bi.bi_op_add = syncprov_op_mod;
1772         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
1773         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
1774         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
1775         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
1776         syncprov.on_bi.bi_op_search = syncprov_op_search;
1777         syncprov.on_bi.bi_extended = syncprov_op_extended;
1778         syncprov.on_bi.bi_operational = syncprov_operational;
1779
1780 #if 0
1781         syncprov.on_response = syncprov_response;
1782 #endif
1783
1784         return overlay_register( &syncprov );
1785 }
1786
1787 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
1788 int
1789 init_module( int argc, char *argv[] )
1790 {
1791         return syncprov_init();
1792 }
1793 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
1794
1795 #endif /* defined(SLAPD_OVER_SYNCPROV) */