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 2004-2007 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 #include "config.h"
  29 #include "ldap_rq.h"
  30
  31 /* A modify request on a particular entry */
  32 typedef struct modinst {
  33         struct modinst *mi_next;
  34         Operation *mi_op;
  35 } modinst;
  36
  37 typedef struct modtarget {
  38         struct modinst *mt_mods;
  39         struct modinst *mt_tail;
  40         Operation *mt_op;
  41         ldap_pvt_thread_mutex_t mt_mutex;
  42 } modtarget;
  43
  44 /* A queued result of a persistent search */
  45 typedef struct syncres {
  46         struct syncres *s_next;
  47         struct berval s_dn;
  48         struct berval s_ndn;
  49         struct berval s_uuid;
  50         struct berval s_csn;
  51         char s_mode;
  52         char s_isreference;
  53 } syncres;
  54
  55 /* Record of a persistent search */
  56 typedef struct syncops {
  57         struct syncops *s_next;
  58         struct berval   s_base;         /* ndn of search base */
  59         ID              s_eid;          /* entryID of search base */
  60         Operation       *s_op;          /* search op */
  61         int             s_rid;
  62         int             s_sid;
  63         struct berval s_filterstr;
  64         int             s_flags;        /* search status */
  65 #define PS_IS_REFRESHING        0x01
  66 #define PS_IS_DETACHED          0x02
  67 #define PS_WROTE_BASE           0x04
  68 #define PS_FIND_BASE            0x08
  69 #define PS_FIX_FILTER           0x10
  70
  71         int             s_inuse;        /* reference count */
  72         struct syncres *s_res;
  73         struct syncres *s_restail;
  74         struct re_s     *s_qtask;       /* task for playing psearch responses */
  75 #define RUNQ_INTERVAL   36000   /* a long time */
  76         ldap_pvt_thread_mutex_t s_mutex;
  77 } syncops;
  78
  79 /* A received sync control */
  80 typedef struct sync_control {
  81         struct sync_cookie sr_state;
  82         int sr_rhint;
  83 } sync_control;
  84
  85 #if 0 /* moved back to slap.h */
  86 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  87 #endif
  88 /* o_sync_mode uses data bits of o_sync */
  89 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  90
  91 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  92 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  93 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  94 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  95
  96 /* Record of which searches matched at premodify step */
  97 typedef struct syncmatches {
  98         struct syncmatches *sm_next;
  99         syncops *sm_op;
 100 } syncmatches;
 101
 102 /* Session log data */
 103 typedef struct slog_entry {
 104         struct slog_entry *se_next;
 105         struct berval se_uuid;
 106         struct berval se_csn;
 107         int     se_sid;
 108         ber_tag_t       se_tag;
 109 } slog_entry;
 110
 111 typedef struct sessionlog {
 112         struct berval   sl_mincsn;
 113         int             sl_num;
 114         int             sl_size;
 115         slog_entry *sl_head;
 116         slog_entry *sl_tail;
 117         ldap_pvt_thread_mutex_t sl_mutex;
 118 } sessionlog;
 119
 120 /* The main state for this overlay */
 121 typedef struct syncprov_info_t {
 122         syncops         *si_ops;
 123         BerVarray       si_ctxcsn;      /* ldapsync context */
 124         int             *si_sids;
 125         int             si_numcsns;
 126         int             si_chkops;      /* checkpointing info */
 127         int             si_chktime;
 128         int             si_numops;      /* number of ops since last checkpoint */
 129         int             si_nopres;      /* Skip present phase */
 130         int             si_usehint;     /* use reload hint */
 131         time_t  si_chklast;     /* time of last checkpoint */
 132         Avlnode *si_mods;       /* entries being modified */
 133         sessionlog      *si_logs;
 134         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 135         ldap_pvt_thread_mutex_t si_ops_mutex;
 136         ldap_pvt_thread_mutex_t si_mods_mutex;
 137 } syncprov_info_t;
 138
 139 typedef struct opcookie {
 140         slap_overinst *son;
 141         syncmatches *smatches;
 142         struct berval sdn;      /* DN of entry, for deletes */
 143         struct berval sndn;
 144         struct berval suuid;    /* UUID of entry */
 145         struct berval sctxcsn;
 146         int sreference; /* Is the entry a reference? */
 147 } opcookie;
 148
 149 typedef struct fbase_cookie {
 150         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 151         syncops *fss;   /* persistent search we're testing against */
 152         int fbase;      /* if TRUE we found the search base and it's still valid */
 153         int fscope;     /* if TRUE then fdn is within the psearch scope */
 154 } fbase_cookie;
 155
 156 static AttributeName csn_anlist[3];
 157 static AttributeName uuid_anlist[2];
 158
 159 /* Build a LDAPsync intermediate state control */
 160 static int
 161 syncprov_state_ctrl(
 162         Operation       *op,
 163         SlapReply       *rs,
 164         Entry           *e,
 165         int             entry_sync_state,
 166         LDAPControl     **ctrls,
 167         int             num_ctrls,
 168         int             send_cookie,
 169         struct berval   *cookie )
 170 {
 171         Attribute* a;
 172         int ret;
 173
 174         BerElementBuffer berbuf;
 175         BerElement *ber = (BerElement *)&berbuf;
 176
 177         struct berval   entryuuid_bv = BER_BVNULL;
 178
 179         ber_init2( ber, 0, LBER_USE_DER );
 180         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 181
 182         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 183
 184         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 185                 AttributeDescription *desc = a->a_desc;
 186                 if ( desc == slap_schema.si_ad_entryUUID ) {
 187                         entryuuid_bv = a->a_nvals[0];
 188                         break;
 189                 }
 190         }
 191
 192         /* FIXME: what if entryuuid is NULL or empty ? */
 193
 194         if ( send_cookie && cookie ) {
 195                 ber_printf( ber, "{eOON}",
 196                         entry_sync_state, &entryuuid_bv, cookie );
 197         } else {
 198                 ber_printf( ber, "{eON}",
 199                         entry_sync_state, &entryuuid_bv );
 200         }
 201
 202         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 203         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 204         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 205
 206         ber_free_buf( ber );
 207
 208         if ( ret < 0 ) {
 209                 Debug( LDAP_DEBUG_TRACE,
 210                         "slap_build_sync_ctrl: ber_flatten2 failed\n",
 211                         0, 0, 0 );
 212                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 213                 return ret;
 214         }
 215
 216         return LDAP_SUCCESS;
 217 }
 218
 219 /* Build a LDAPsync final state control */
 220 static int
 221 syncprov_done_ctrl(
 222         Operation       *op,
 223         SlapReply       *rs,
 224         LDAPControl     **ctrls,
 225         int                     num_ctrls,
 226         int                     send_cookie,
 227         struct berval *cookie,
 228         int                     refreshDeletes )
 229 {
 230         int ret;
 231         BerElementBuffer berbuf;
 232         BerElement *ber = (BerElement *)&berbuf;
 233
 234         ber_init2( ber, NULL, LBER_USE_DER );
 235         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 236
 237         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 238
 239         ber_printf( ber, "{" );
 240         if ( send_cookie && cookie ) {
 241                 ber_printf( ber, "O", cookie );
 242         }
 243         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 244                 ber_printf( ber, "b", refreshDeletes );
 245         }
 246         ber_printf( ber, "N}" );
 247
 248         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 249         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 250         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 251
 252         ber_free_buf( ber );
 253
 254         if ( ret < 0 ) {
 255                 Debug( LDAP_DEBUG_TRACE,
 256                         "syncprov_done_ctrl: ber_flatten2 failed\n",
 257                         0, 0, 0 );
 258                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 259                 return ret;
 260         }
 261
 262         return LDAP_SUCCESS;
 263 }
 264
 265 static int
 266 syncprov_sendinfo(
 267         Operation       *op,
 268         SlapReply       *rs,
 269         int                     type,
 270         struct berval *cookie,
 271         int                     refreshDone,
 272         BerVarray       syncUUIDs,
 273         int                     refreshDeletes )
 274 {
 275         BerElementBuffer berbuf;
 276         BerElement *ber = (BerElement *)&berbuf;
 277         struct berval rspdata;
 278
 279         int ret;
 280
 281         ber_init2( ber, NULL, LBER_USE_DER );
 282         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 283
 284         if ( type ) {
 285                 switch ( type ) {
 286                 case LDAP_TAG_SYNC_NEW_COOKIE:
 287                         ber_printf( ber, "tO", type, cookie );
 288                         break;
 289                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 290                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 291                         ber_printf( ber, "t{", type );
 292                         if ( cookie ) {
 293                                 ber_printf( ber, "O", cookie );
 294                         }
 295                         if ( refreshDone == 0 ) {
 296                                 ber_printf( ber, "b", refreshDone );
 297                         }
 298                         ber_printf( ber, "N}" );
 299                         break;
 300                 case LDAP_TAG_SYNC_ID_SET:
 301                         ber_printf( ber, "t{", type );
 302                         if ( cookie ) {
 303                                 ber_printf( ber, "O", cookie );
 304                         }
 305                         if ( refreshDeletes == 1 ) {
 306                                 ber_printf( ber, "b", refreshDeletes );
 307                         }
 308                         ber_printf( ber, "[W]", syncUUIDs );
 309                         ber_printf( ber, "N}" );
 310                         break;
 311                 default:
 312                         Debug( LDAP_DEBUG_TRACE,
 313                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 314                                 type, 0, 0 );
 315                         return LDAP_OTHER;
 316                 }
 317         }
 318
 319         ret = ber_flatten2( ber, &rspdata, 0 );
 320
 321         if ( ret < 0 ) {
 322                 Debug( LDAP_DEBUG_TRACE,
 323                         "syncprov_sendinfo: ber_flatten2 failed\n",
 324                         0, 0, 0 );
 325                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 326                 return ret;
 327         }
 328
 329         rs->sr_rspoid = LDAP_SYNC_INFO;
 330         rs->sr_rspdata = &rspdata;
 331         send_ldap_intermediate( op, rs );
 332         rs->sr_rspdata = NULL;
 333         ber_free_buf( ber );
 334
 335         return LDAP_SUCCESS;
 336 }
 337
 338 /* Find a modtarget in an AVL tree */
 339 static int
 340 sp_avl_cmp( const void *c1, const void *c2 )
 341 {
 342         const modtarget *m1, *m2;
 343         int rc;
 344
 345         m1 = c1; m2 = c2;
 346         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 347
 348         if ( rc ) return rc;
 349         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 350 }
 351
 352 /* syncprov_findbase:
 353  *   finds the true DN of the base of a search (with alias dereferencing) and
 354  * checks to make sure the base entry doesn't get replaced with a different
 355  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 356  * change is detected, any persistent search on this base must be terminated /
 357  * reloaded.
 358  *   On the first call, we just save the DN and entryID. On subsequent calls
 359  * we compare the DN and entryID with the saved values.
 360  */
 361 static int
 362 findbase_cb( Operation *op, SlapReply *rs )
 363 {
 364         slap_callback *sc = op->o_callback;
 365
 366         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 367                 fbase_cookie *fc = sc->sc_private;
 368
 369                 /* If no entryID, we're looking for the first time.
 370                  * Just store whatever we got.
 371                  */
 372                 if ( fc->fss->s_eid == NOID ) {
 373                         fc->fbase = 2;
 374                         fc->fss->s_eid = rs->sr_entry->e_id;
 375                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 376
 377                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 378                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 379
 380                 /* OK, the DN is the same and the entryID is the same. */
 381                         fc->fbase = 1;
 382                 }
 383         }
 384         if ( rs->sr_err != LDAP_SUCCESS ) {
 385                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 386         }
 387         return LDAP_SUCCESS;
 388 }
 389
 390 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 391 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 392
 393 static int
 394 syncprov_findbase( Operation *op, fbase_cookie *fc )
 395 {
 396         opcookie *opc = op->o_callback->sc_private;
 397         slap_overinst *on = opc->son;
 398
 399         /* Use basic parameters from syncrepl search, but use
 400          * current op's threadctx / tmpmemctx
 401          */
 402         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 403         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 404                 slap_callback cb = {0};
 405                 Operation fop;
 406                 SlapReply frs = { REP_RESULT };
 407                 BackendInfo *bi;
 408                 int rc;
 409
 410                 fc->fss->s_flags ^= PS_FIND_BASE;
 411                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 412
 413                 fop = *fc->fss->s_op;
 414
 415                 fop.o_hdr = op->o_hdr;
 416                 fop.o_bd = op->o_bd;
 417                 fop.o_time = op->o_time;
 418                 fop.o_tincr = op->o_tincr;
 419                 bi = op->o_bd->bd_info;
 420
 421                 cb.sc_response = findbase_cb;
 422                 cb.sc_private = fc;
 423
 424                 fop.o_sync_mode = 0;    /* turn off sync mode */
 425                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 426                 fop.o_callback = &cb;
 427                 fop.o_tag = LDAP_REQ_SEARCH;
 428                 fop.ors_scope = LDAP_SCOPE_BASE;
 429                 fop.ors_limit = NULL;
 430                 fop.ors_slimit = 1;
 431                 fop.ors_tlimit = SLAP_NO_LIMIT;
 432                 fop.ors_attrs = slap_anlist_no_attrs;
 433                 fop.ors_attrsonly = 1;
 434                 fop.ors_filter = &generic_filter;
 435                 fop.ors_filterstr = generic_filterstr;
 436
 437                 rc = overlay_op_walk( &fop, &frs, op_search, on->on_info, on );
 438                 op->o_bd->bd_info = bi;
 439         } else {
 440                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 441                 fc->fbase = 1;
 442         }
 443
 444         /* After the first call, see if the fdn resides in the scope */
 445         if ( fc->fbase == 1 ) {
 446                 switch ( fc->fss->s_op->ors_scope ) {
 447                 case LDAP_SCOPE_BASE:
 448                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 449                         break;
 450                 case LDAP_SCOPE_ONELEVEL: {
 451                         struct berval pdn;
 452                         dnParent( fc->fdn, &pdn );
 453                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 454                         break; }
 455                 case LDAP_SCOPE_SUBTREE:
 456                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 457                         break;
 458                 case LDAP_SCOPE_SUBORDINATE:
 459                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 460                                 !dn_match( fc->fdn, &fc->fss->s_base );
 461                         break;
 462                 }
 463         }
 464
 465         if ( fc->fbase )
 466                 return LDAP_SUCCESS;
 467
 468         /* If entryID has changed, then the base of this search has
 469          * changed. Invalidate the psearch.
 470          */
 471         return LDAP_NO_SUCH_OBJECT;
 472 }
 473
 474 /* syncprov_findcsn:
 475  *   This function has three different purposes, but they all use a search
 476  * that filters on entryCSN so they're combined here.
 477  * 1: at startup time, after a contextCSN has been read from the database,
 478  * we search for all entries with CSN >= contextCSN in case the contextCSN
 479  * was not checkpointed at the previous shutdown.
 480  *
 481  * 2: when the current contextCSN is known and we have a sync cookie, we search
 482  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 483  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 484  *
 485  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 486  * CSN, and generate Present records for them. We always collect this result
 487  * in SyncID sets, even if there's only one match.
 488  */
 489 typedef enum find_csn_t {
 490         FIND_MAXCSN     = 1,
 491         FIND_CSN        = 2,
 492         FIND_PRESENT    = 3
 493 } find_csn_t;
 494
 495 static int
 496 findmax_cb( Operation *op, SlapReply *rs )
 497 {
 498         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 499                 struct berval *maxcsn = op->o_callback->sc_private;
 500                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 501                         slap_schema.si_ad_entryCSN );
 502
 503                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 ) {
 504                         maxcsn->bv_len = a->a_vals[0].bv_len;
 505                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 506                 }
 507         }
 508         return LDAP_SUCCESS;
 509 }
 510
 511 static int
 512 findcsn_cb( Operation *op, SlapReply *rs )
 513 {
 514         slap_callback *sc = op->o_callback;
 515
 516         /* We just want to know that at least one exists, so it's OK if
 517          * we exceed the unchecked limit.
 518          */
 519         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 520                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 521                 sc->sc_private = (void *)1;
 522         }
 523         return LDAP_SUCCESS;
 524 }
 525
 526 /* Build a list of entryUUIDs for sending in a SyncID set */
 527
 528 #define UUID_LEN        16
 529
 530 typedef struct fpres_cookie {
 531         int num;
 532         BerVarray uuids;
 533         char *last;
 534 } fpres_cookie;
 535
 536 static int
 537 findpres_cb( Operation *op, SlapReply *rs )
 538 {
 539         slap_callback *sc = op->o_callback;
 540         fpres_cookie *pc = sc->sc_private;
 541         Attribute *a;
 542         int ret = SLAP_CB_CONTINUE;
 543
 544         switch ( rs->sr_type ) {
 545         case REP_SEARCH:
 546                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 547                 if ( a ) {
 548                         pc->uuids[pc->num].bv_val = pc->last;
 549                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 550                                 pc->uuids[pc->num].bv_len );
 551                         pc->num++;
 552                         pc->last = pc->uuids[pc->num].bv_val;
 553                         pc->uuids[pc->num].bv_val = NULL;
 554                 }
 555                 ret = LDAP_SUCCESS;
 556                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 557                         break;
 558                 /* FALLTHRU */
 559         case REP_RESULT:
 560                 ret = rs->sr_err;
 561                 if ( pc->num ) {
 562                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 563                                 0, pc->uuids, 0 );
 564                         pc->uuids[pc->num].bv_val = pc->last;
 565                         pc->num = 0;
 566                         pc->last = pc->uuids[0].bv_val;
 567                 }
 568                 break;
 569         default:
 570                 break;
 571         }
 572         return ret;
 573 }
 574
 575 static int
 576 syncprov_findcsn( Operation *op, find_csn_t mode )
 577 {
 578         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 579         syncprov_info_t         *si = on->on_bi.bi_private;
 580
 581         slap_callback cb = {0};
 582         Operation fop;
 583         SlapReply frs = { REP_RESULT };
 584         char buf[LDAP_LUTIL_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 585         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
 586         struct berval maxcsn;
 587         Filter cf;
 588         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 589         fpres_cookie pcookie;
 590         sync_control *srs = NULL;
 591         struct slap_limits_set fc_limits;
 592         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 593         int maxid = 0;
 594
 595         if ( mode != FIND_MAXCSN ) {
 596                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 597         }
 598
 599         fop = *op;
 600         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 601         /* We want pure entries, not referrals */
 602         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 603
 604         cf.f_ava = &eq;
 605         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 606         BER_BVZERO( &cf.f_av_value );
 607         cf.f_next = NULL;
 608
 609         fop.o_callback = &cb;
 610         fop.ors_limit = NULL;
 611         fop.ors_tlimit = SLAP_NO_LIMIT;
 612         fop.ors_filter = &cf;
 613         fop.ors_filterstr.bv_val = buf;
 614
 615 again:
 616         switch( mode ) {
 617         case FIND_MAXCSN:
 618                 cf.f_choice = LDAP_FILTER_GE;
 619                 cf.f_av_value = si->si_ctxcsn[0];
 620                 /* If there are multiple CSNs, use the largest */
 621                 for ( i=1; i<si->si_numcsns; i++) {
 622                         if ( ber_bvcmp( &cf.f_av_value, &si->si_ctxcsn[i] ) < 0 ) {
 623                                 cf.f_av_value = si->si_ctxcsn[i];
 624                                 maxid = i;
 625                         }
 626                 }
 627                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 628                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 629                 if ( fop.ors_filterstr.bv_len < 0 || fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 630                         return LDAP_OTHER;
 631                 }
 632                 fop.ors_attrsonly = 0;
 633                 fop.ors_attrs = csn_anlist;
 634                 fop.ors_slimit = SLAP_NO_LIMIT;
 635                 cb.sc_private = &maxcsn;
 636                 cb.sc_response = findmax_cb;
 637                 strcpy( cbuf, cf.f_av_value.bv_val );
 638                 maxcsn.bv_val = cbuf;
 639                 maxcsn.bv_len = cf.f_av_value.bv_len;
 640                 break;
 641         case FIND_CSN:
 642                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 643                         cf.f_av_value = srs->sr_state.ctxcsn[0];
 644                         /* If there are multiple CSNs, use the smallest */
 645                         for ( i=1; i<srs->sr_state.numcsns; i++ ) {
 646                                 if ( ber_bvcmp( &cf.f_av_value, &srs->sr_state.ctxcsn[i] )
 647                                         > 0 ) {
 648                                         cf.f_av_value = srs->sr_state.ctxcsn[i];
 649                                 }
 650                         }
 651                 }
 652                 /* Look for exact match the first time */
 653                 if ( findcsn_retry ) {
 654                         cf.f_choice = LDAP_FILTER_EQUALITY;
 655                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 656                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 657                 /* On retry, look for <= */
 658                 } else {
 659                         cf.f_choice = LDAP_FILTER_LE;
 660                         fop.ors_limit = &fc_limits;
 661                         memset( &fc_limits, 0, sizeof( fc_limits ));
 662                         fc_limits.lms_s_unchecked = 1;
 663                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 664                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 665                 }
 666                 if ( fop.ors_filterstr.bv_len < 0 || fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 667                         return LDAP_OTHER;
 668                 }
 669                 fop.ors_attrsonly = 1;
 670                 fop.ors_attrs = slap_anlist_no_attrs;
 671                 fop.ors_slimit = 1;
 672                 cb.sc_private = NULL;
 673                 cb.sc_response = findcsn_cb;
 674                 break;
 675         case FIND_PRESENT:
 676                 fop.ors_filter = op->ors_filter;
 677                 fop.ors_filterstr = op->ors_filterstr;
 678                 fop.ors_attrsonly = 0;
 679                 fop.ors_attrs = uuid_anlist;
 680                 fop.ors_slimit = SLAP_NO_LIMIT;
 681                 cb.sc_private = &pcookie;
 682                 cb.sc_response = findpres_cb;
 683                 pcookie.num = 0;
 684
 685                 /* preallocate storage for a full set */
 686                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 687                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 688                         op->o_tmpmemctx );
 689                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 690                 pcookie.uuids[0].bv_val = pcookie.last;
 691                 pcookie.uuids[0].bv_len = UUID_LEN;
 692                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 693                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 694                         pcookie.uuids[i].bv_len = UUID_LEN;
 695                 }
 696                 break;
 697         }
 698
 699         fop.o_bd->bd_info = on->on_info->oi_orig;
 700         fop.o_bd->be_search( &fop, &frs );
 701         fop.o_bd->bd_info = (BackendInfo *)on;
 702
 703         switch( mode ) {
 704         case FIND_MAXCSN:
 705                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 706                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 707                         si->si_numops++;        /* ensure a checkpoint */
 708                 }
 709                 break;
 710         case FIND_CSN:
 711                 /* If matching CSN was not found, invalidate the context. */
 712                 if ( !cb.sc_private ) {
 713                         /* If we didn't find an exact match, then try for <= */
 714                         if ( findcsn_retry ) {
 715                                 findcsn_retry = 0;
 716                                 goto again;
 717                         }
 718                         rc = LDAP_NO_SUCH_OBJECT;
 719                 }
 720                 break;
 721         case FIND_PRESENT:
 722                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 723                 break;
 724         }
 725
 726         return rc;
 727 }
 728
 729 static void
 730 syncprov_free_syncop( syncops *so )
 731 {
 732         syncres *sr, *srnext;
 733         GroupAssertion *ga, *gnext;
 734
 735         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 736         if ( --so->s_inuse > 0 ) {
 737                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 738                 return;
 739         }
 740         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 741         if ( so->s_flags & PS_IS_DETACHED ) {
 742                 filter_free( so->s_op->ors_filter );
 743                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 744                         gnext = ga->ga_next;
 745                         ch_free( ga );
 746                 }
 747                 ch_free( so->s_op );
 748         }
 749         ch_free( so->s_base.bv_val );
 750         for ( sr=so->s_res; sr; sr=srnext ) {
 751                 srnext = sr->s_next;
 752                 ch_free( sr );
 753         }
 754         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 755         ch_free( so );
 756 }
 757
 758 /* Send a persistent search response */
 759 static int
 760 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so,
 761         Entry **e, int mode )
 762 {
 763         slap_overinst *on = opc->son;
 764
 765         SlapReply rs = { REP_SEARCH };
 766         LDAPControl *ctrls[2];
 767         struct berval cookie, csns[2];
 768         Entry e_uuid = {0};
 769         Attribute a_uuid = {0};
 770
 771         if ( so->s_op->o_abandon )
 772                 return SLAPD_ABANDON;
 773
 774         ctrls[1] = NULL;
 775         csns[0] = opc->sctxcsn;
 776         BER_BVZERO( &csns[1] );
 777         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, so->s_sid );
 778
 779         e_uuid.e_attrs = &a_uuid;
 780         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 781         a_uuid.a_nvals = &opc->suuid;
 782         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 783                 mode, ctrls, 0, 1, &cookie );
 784         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 785
 786         rs.sr_ctrls = ctrls;
 787         op->o_bd->bd_info = (BackendInfo *)on->on_info;
 788         switch( mode ) {
 789         case LDAP_SYNC_ADD:
 790                 rs.sr_entry = *e;
 791                 if ( rs.sr_entry->e_private )
 792                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 793                 if ( opc->sreference ) {
 794                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 795                         rs.sr_err = send_search_reference( op, &rs );
 796                         ber_bvarray_free( rs.sr_ref );
 797                         if ( !rs.sr_entry )
 798                                 *e = NULL;
 799                         break;
 800                 }
 801                 /* fallthru */
 802         case LDAP_SYNC_MODIFY:
 803                 rs.sr_entry = *e;
 804                 if ( rs.sr_entry->e_private )
 805                         rs.sr_flags = REP_ENTRY_MUSTRELEASE;
 806                 rs.sr_attrs = op->ors_attrs;
 807                 rs.sr_err = send_search_entry( op, &rs );
 808                 if ( !rs.sr_entry )
 809                         *e = NULL;
 810                 break;
 811         case LDAP_SYNC_DELETE:
 812                 e_uuid.e_attrs = NULL;
 813                 e_uuid.e_name = opc->sdn;
 814                 e_uuid.e_nname = opc->sndn;
 815                 rs.sr_entry = &e_uuid;
 816                 if ( opc->sreference ) {
 817                         struct berval bv = BER_BVNULL;
 818                         rs.sr_ref = &bv;
 819                         rs.sr_err = send_search_reference( op, &rs );
 820                 } else {
 821                         rs.sr_err = send_search_entry( op, &rs );
 822                 }
 823                 break;
 824         default:
 825                 assert(0);
 826         }
 827         /* In case someone else freed it already? */
 828         if ( rs.sr_ctrls ) {
 829                 op->o_tmpfree( rs.sr_ctrls[0], op->o_tmpmemctx );
 830                 rs.sr_ctrls = NULL;
 831         }
 832
 833         return rs.sr_err;
 834 }
 835
 836 /* Play back queued responses */
 837 static int
 838 syncprov_qplay( Operation *op, slap_overinst *on, syncops *so )
 839 {
 840         syncres *sr;
 841         Entry *e;
 842         opcookie opc;
 843         int rc = 0;
 844
 845         opc.son = on;
 846
 847         for (;;) {
 848                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 849                 sr = so->s_res;
 850                 if ( sr )
 851                         so->s_res = sr->s_next;
 852                 if ( !so->s_res )
 853                         so->s_restail = NULL;
 854                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 855
 856                 if ( !sr || so->s_op->o_abandon )
 857                         break;
 858
 859                 opc.sdn = sr->s_dn;
 860                 opc.sndn = sr->s_ndn;
 861                 opc.suuid = sr->s_uuid;
 862                 opc.sctxcsn = sr->s_csn;
 863                 opc.sreference = sr->s_isreference;
 864                 e = NULL;
 865
 866                 if ( sr->s_mode != LDAP_SYNC_DELETE ) {
 867                         rc = overlay_entry_get_ov( op, &opc.sndn, NULL, NULL, 0, &e, on );
 868                         if ( rc ) {
 869                                 Debug( LDAP_DEBUG_SYNC, "syncprov_qplay: failed to get %s, "
 870                                         "error (%d), ignoring...\n", opc.sndn.bv_val, rc, 0 );
 871                                 ch_free( sr );
 872                                 rc = 0;
 873                                 continue;
 874                         }
 875                 }
 876                 rc = syncprov_sendresp( op, &opc, so, &e, sr->s_mode );
 877
 878                 if ( e ) {
 879                         overlay_entry_release_ov( op, e, 0, on );
 880                 }
 881
 882                 ch_free( sr );
 883
 884                 if ( rc )
 885                         break;
 886         }
 887         return rc;
 888 }
 889
 890 /* runqueue task for playing back queued responses */
 891 static void *
 892 syncprov_qtask( void *ctx, void *arg )
 893 {
 894         struct re_s *rtask = arg;
 895         syncops *so = rtask->arg;
 896         slap_overinst *on = so->s_op->o_private;
 897         OperationBuffer opbuf;
 898         Operation *op;
 899         BackendDB be;
 900         int rc;
 901
 902         op = &opbuf.ob_op;
 903         *op = *so->s_op;
 904         op->o_hdr = &opbuf.ob_hdr;
 905         op->o_controls = opbuf.ob_controls;
 906         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 907
 908         *op->o_hdr = *so->s_op->o_hdr;
 909
 910         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 911         op->o_tmpmfuncs = &slap_sl_mfuncs;
 912         op->o_threadctx = ctx;
 913
 914         /* syncprov_qplay expects a fake db */
 915         be = *so->s_op->o_bd;
 916         be.be_flags |= SLAP_DBFLAG_OVERLAY;
 917         op->o_bd = &be;
 918         op->o_private = NULL;
 919         op->o_callback = NULL;
 920
 921         rc = syncprov_qplay( op, on, so );
 922
 923         /* decrement use count... */
 924         syncprov_free_syncop( so );
 925
 926         /* wait until we get explicitly scheduled again */
 927         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 928         ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
 929         if ( rc == 0 ) {
 930                 ldap_pvt_runqueue_resched( &slapd_rq, rtask, 1 );
 931         } else {
 932                 /* bail out on any error */
 933                 ldap_pvt_runqueue_remove( &slapd_rq, rtask );
 934         }
 935         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 936
 937 #if 0   /* FIXME: connection_close isn't exported from slapd.
 938                  * should it be?
 939                  */
 940         if ( rc ) {
 941                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
 942                 if ( connection_state_closing( op->o_conn )) {
 943                         connection_close( op->o_conn );
 944                 }
 945                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
 946         }
 947 #endif
 948         return NULL;
 949 }
 950
 951 /* Start the task to play back queued psearch responses */
 952 static void
 953 syncprov_qstart( syncops *so )
 954 {
 955         int wake=0;
 956         ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
 957         if ( !so->s_qtask ) {
 958                 so->s_qtask = ldap_pvt_runqueue_insert( &slapd_rq, RUNQ_INTERVAL,
 959                         syncprov_qtask, so, "syncprov_qtask",
 960                         so->s_op->o_conn->c_peer_name.bv_val );
 961                 ++so->s_inuse;
 962                 wake = 1;
 963         } else {
 964                 if (!ldap_pvt_runqueue_isrunning( &slapd_rq, so->s_qtask ) &&
 965                         !so->s_qtask->next_sched.tv_sec ) {
 966                         so->s_qtask->interval.tv_sec = 0;
 967                         ldap_pvt_runqueue_resched( &slapd_rq, so->s_qtask, 0 );
 968                         so->s_qtask->interval.tv_sec = RUNQ_INTERVAL;
 969                         ++so->s_inuse;
 970                         wake = 1;
 971                 }
 972         }
 973         ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
 974         if ( wake )
 975                 slap_wake_listener();
 976 }
 977
 978 /* Queue a persistent search response */
 979 static int
 980 syncprov_qresp( opcookie *opc, syncops *so, int mode )
 981 {
 982         syncres *sr;
 983         int sid;
 984
 985         /* Don't send changes back to their originator */
 986         sid = slap_parse_csn_sid( &opc->sctxcsn );
 987         if ( sid >= 0 && sid == so->s_sid )
 988                 return LDAP_SUCCESS;
 989
 990         sr = ch_malloc(sizeof(syncres) + opc->suuid.bv_len + 1 +
 991                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1 + opc->sctxcsn.bv_len + 1 );
 992         sr->s_next = NULL;
 993         sr->s_dn.bv_val = (char *)(sr + 1);
 994         sr->s_dn.bv_len = opc->sdn.bv_len;
 995         sr->s_mode = mode;
 996         sr->s_isreference = opc->sreference;
 997         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
 998                  opc->sdn.bv_val ) + 1;
 999         sr->s_ndn.bv_len = opc->sndn.bv_len;
1000         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1001                  opc->sndn.bv_val ) + 1;
1002         sr->s_uuid.bv_len = opc->suuid.bv_len;
1003         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1004         sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1005         sr->s_csn.bv_len = opc->sctxcsn.bv_len;
1006         strcpy( sr->s_csn.bv_val, opc->sctxcsn.bv_val );
1007
1008         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1009         if ( !so->s_res ) {
1010                 so->s_res = sr;
1011         } else {
1012                 so->s_restail->s_next = sr;
1013         }
1014         so->s_restail = sr;
1015
1016         /* If the base of the psearch was modified, check it next time round */
1017         if ( so->s_flags & PS_WROTE_BASE ) {
1018                 so->s_flags ^= PS_WROTE_BASE;
1019                 so->s_flags |= PS_FIND_BASE;
1020         }
1021         if ( so->s_flags & PS_IS_DETACHED ) {
1022                 syncprov_qstart( so );
1023         }
1024         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1025         return LDAP_SUCCESS;
1026 }
1027
1028 static int
1029 syncprov_drop_psearch( syncops *so, int lock )
1030 {
1031         if ( so->s_flags & PS_IS_DETACHED ) {
1032                 if ( lock )
1033                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1034                 so->s_op->o_conn->c_n_ops_executing--;
1035                 so->s_op->o_conn->c_n_ops_completed++;
1036                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1037                         o_next );
1038                 if ( lock )
1039                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1040         }
1041         syncprov_free_syncop( so );
1042
1043         return 0;
1044 }
1045
1046 static int
1047 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1048 {
1049         slap_callback *sc = op->o_callback;
1050         op->o_callback = sc->sc_next;
1051         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1052         op->o_tmpfree( sc, op->o_tmpmemctx );
1053         return 0;
1054 }
1055
1056 static int
1057 syncprov_op_abandon( Operation *op, SlapReply *rs )
1058 {
1059         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1060         syncprov_info_t         *si = on->on_bi.bi_private;
1061         syncops *so, *soprev;
1062
1063         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1064         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1065                 soprev=so, so=so->s_next ) {
1066                 if ( so->s_op->o_connid == op->o_connid &&
1067                         so->s_op->o_msgid == op->orn_msgid ) {
1068                                 so->s_op->o_abandon = 1;
1069                                 soprev->s_next = so->s_next;
1070                                 break;
1071                 }
1072         }
1073         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1074         if ( so ) {
1075                 /* Is this really a Cancel exop? */
1076                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1077                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1078                         rs->sr_err = LDAP_CANCELLED;
1079                         send_ldap_result( so->s_op, rs );
1080                         if ( so->s_flags & PS_IS_DETACHED ) {
1081                                 slap_callback *cb;
1082                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1083                                 cb->sc_cleanup = syncprov_ab_cleanup;
1084                                 cb->sc_next = op->o_callback;
1085                                 cb->sc_private = so;
1086                                 return SLAP_CB_CONTINUE;
1087                         }
1088                 }
1089                 syncprov_drop_psearch( so, 0 );
1090         }
1091         return SLAP_CB_CONTINUE;
1092 }
1093
1094 /* Find which persistent searches are affected by this operation */
1095 static void
1096 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1097 {
1098         slap_overinst *on = opc->son;
1099         syncprov_info_t         *si = on->on_bi.bi_private;
1100
1101         fbase_cookie fc;
1102         syncops *ss, *sprev, *snext;
1103         Entry *e = NULL;
1104         Attribute *a;
1105         int rc;
1106         struct berval newdn;
1107         int freefdn = 0;
1108         BackendDB *b0 = op->o_bd, db;
1109
1110         fc.fdn = &op->o_req_ndn;
1111         /* compute new DN */
1112         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1113                 struct berval pdn;
1114                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1115                 else dnParent( fc.fdn, &pdn );
1116                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1117                 fc.fdn = &newdn;
1118                 freefdn = 1;
1119         }
1120         if ( op->o_tag != LDAP_REQ_ADD ) {
1121                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1122                         db = *op->o_bd;
1123                         op->o_bd = &db;
1124                 }
1125                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1126                 /* If we're sending responses now, make a copy and unlock the DB */
1127                 if ( e && !saveit ) {
1128                         Entry *e2 = entry_dup( e );
1129                         overlay_entry_release_ov( op, e, 0, on );
1130                         e = e2;
1131                 }
1132                 if ( rc ) {
1133                         op->o_bd = b0;
1134                         return;
1135                 }
1136         } else {
1137                 e = op->ora_e;
1138         }
1139
1140         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1141                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1142                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1143                 opc->sreference = is_entry_referral( e );
1144                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1145                 if ( a )
1146                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1147         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1148                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1149                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1150                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1151                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1152         }
1153
1154         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1155         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1156                 sprev = ss, ss=snext)
1157         {
1158                 syncmatches *sm;
1159                 int found = 0;
1160
1161                 snext = ss->s_next;
1162                 /* validate base */
1163                 fc.fss = ss;
1164                 fc.fbase = 0;
1165                 fc.fscope = 0;
1166
1167                 /* If the base of the search is missing, signal a refresh */
1168                 rc = syncprov_findbase( op, &fc );
1169                 if ( rc != LDAP_SUCCESS ) {
1170                         SlapReply rs = {REP_RESULT};
1171                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1172                                 "search base has changed" );
1173                         sprev->s_next = snext;
1174                         syncprov_drop_psearch( ss, 1 );
1175                         ss = sprev;
1176                         continue;
1177                 }
1178
1179
1180                 /* If we're sending results now, look for this op in old matches */
1181                 if ( !saveit ) {
1182                         syncmatches *old;
1183
1184                         /* Did we modify the search base? */
1185                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1186                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1187                                 ss->s_flags |= PS_WROTE_BASE;
1188                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1189                         }
1190
1191                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1192                                 old=sm, sm=sm->sm_next ) {
1193                                 if ( sm->sm_op == ss ) {
1194                                         found = 1;
1195                                         old->sm_next = sm->sm_next;
1196                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1197                                         break;
1198                                 }
1199                         }
1200                 }
1201
1202                 /* check if current o_req_dn is in scope and matches filter */
1203                 if ( fc.fscope && test_filter( op, e, ss->s_op->ors_filter ) ==
1204                         LDAP_COMPARE_TRUE ) {
1205                         if ( saveit ) {
1206                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1207                                 sm->sm_next = opc->smatches;
1208                                 sm->sm_op = ss;
1209                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1210                                 ++ss->s_inuse;
1211                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1212                                 opc->smatches = sm;
1213                         } else {
1214                                 /* if found send UPDATE else send ADD */
1215                                 syncprov_qresp( opc, ss,
1216                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1217                         }
1218                 } else if ( !saveit && found ) {
1219                         /* send DELETE */
1220                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1221                 }
1222         }
1223         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1224
1225         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1226                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1227                         op->o_bd = &db;
1228                 }
1229                 overlay_entry_release_ov( op, e, 0, on );
1230                 op->o_bd = b0;
1231         }
1232         if ( freefdn ) {
1233                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1234         }
1235         op->o_bd = b0;
1236 }
1237
1238 static int
1239 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1240 {
1241         slap_callback *cb = op->o_callback;
1242         opcookie *opc = cb->sc_private;
1243         slap_overinst *on = opc->son;
1244         syncprov_info_t         *si = on->on_bi.bi_private;
1245         syncmatches *sm, *snext;
1246         modtarget *mt, mtdummy;
1247
1248         for (sm = opc->smatches; sm; sm=snext) {
1249                 snext = sm->sm_next;
1250                 syncprov_free_syncop( sm->sm_op );
1251                 op->o_tmpfree( sm, op->o_tmpmemctx );
1252         }
1253
1254         /* Remove op from lock table */
1255         mtdummy.mt_op = op;
1256         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1257         mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1258         if ( mt ) {
1259                 modinst *mi = mt->mt_mods;
1260
1261                 /* If there are more, promote the next one */
1262                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1263                 if ( mi->mi_next ) {
1264                         mt->mt_mods = mi->mi_next;
1265                         mt->mt_op = mt->mt_mods->mi_op;
1266                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1267                 } else {
1268                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1269                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1270                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1271                         ch_free( mt );
1272                 }
1273         }
1274         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1275         if ( !BER_BVISNULL( &opc->suuid ))
1276                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1277         if ( !BER_BVISNULL( &opc->sndn ))
1278                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1279         if ( !BER_BVISNULL( &opc->sdn ))
1280                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1281         op->o_callback = cb->sc_next;
1282         op->o_tmpfree(cb, op->o_tmpmemctx);
1283
1284         return 0;
1285 }
1286
1287 static void
1288 syncprov_checkpoint( Operation *op, SlapReply *rs, slap_overinst *on )
1289 {
1290         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1291         Modifications mod;
1292         Operation opm;
1293         SlapReply rsm = { 0 };
1294         slap_callback cb = {0};
1295
1296         mod.sml_numvals = si->si_numcsns;
1297         mod.sml_values = si->si_ctxcsn;
1298         mod.sml_nvalues = NULL;
1299         mod.sml_desc = slap_schema.si_ad_contextCSN;
1300         mod.sml_op = LDAP_MOD_REPLACE;
1301         mod.sml_flags = 0;
1302         mod.sml_next = NULL;
1303
1304         cb.sc_response = slap_null_cb;
1305         opm = *op;
1306         opm.o_tag = LDAP_REQ_MODIFY;
1307         opm.o_callback = &cb;
1308         opm.orm_modlist = &mod;
1309         opm.orm_no_opattrs = 1;
1310         opm.o_req_dn = op->o_bd->be_suffix[0];
1311         opm.o_req_ndn = op->o_bd->be_nsuffix[0];
1312         opm.o_bd->bd_info = on->on_info->oi_orig;
1313         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1314         opm.o_no_schema_check = 1;
1315         opm.o_bd->be_modify( &opm, &rsm );
1316         if ( mod.sml_next != NULL ) {
1317                 slap_mods_free( mod.sml_next, 1 );
1318         }
1319         opm.orm_no_opattrs = 0;
1320 }
1321
1322 static void
1323 syncprov_add_slog( Operation *op )
1324 {
1325         opcookie *opc = op->o_callback->sc_private;
1326         slap_overinst *on = opc->son;
1327         syncprov_info_t         *si = on->on_bi.bi_private;
1328         sessionlog *sl;
1329         slog_entry *se;
1330
1331         sl = si->si_logs;
1332         {
1333                 /* Allocate a record. UUIDs are not NUL-terminated. */
1334                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1335                         op->o_csn.bv_len + 1 );
1336                 se->se_next = NULL;
1337                 se->se_tag = op->o_tag;
1338
1339                 se->se_uuid.bv_val = (char *)(&se[1]);
1340                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1341                 se->se_uuid.bv_len = opc->suuid.bv_len;
1342
1343                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1344                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1345                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1346                 se->se_csn.bv_len = op->o_csn.bv_len;
1347                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1348
1349                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1350                 if ( sl->sl_head ) {
1351                         sl->sl_tail->se_next = se;
1352                 } else {
1353                         sl->sl_head = se;
1354                 }
1355                 sl->sl_tail = se;
1356                 sl->sl_num++;
1357                 while ( sl->sl_num > sl->sl_size ) {
1358                         se = sl->sl_head;
1359                         sl->sl_head = se->se_next;
1360                         strcpy( sl->sl_mincsn.bv_val, se->se_csn.bv_val );
1361                         sl->sl_mincsn.bv_len = se->se_csn.bv_len;
1362                         ch_free( se );
1363                         sl->sl_num--;
1364                 }
1365                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1366         }
1367 }
1368
1369 /* Just set a flag if we found the matching entry */
1370 static int
1371 playlog_cb( Operation *op, SlapReply *rs )
1372 {
1373         if ( rs->sr_type == REP_SEARCH ) {
1374                 op->o_callback->sc_private = (void *)1;
1375         }
1376         return rs->sr_err;
1377 }
1378
1379 /* enter with sl->sl_mutex locked, release before returning */
1380 static void
1381 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1382         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1383 {
1384         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1385         slog_entry *se;
1386         int i, j, ndel, num, nmods, mmods;
1387         char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1388         BerVarray uuids;
1389         struct berval delcsn[2];
1390
1391         if ( !sl->sl_num ) {
1392                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1393                 return;
1394         }
1395
1396         num = sl->sl_num;
1397         i = 0;
1398         nmods = 0;
1399
1400         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1401                 num * UUID_LEN, op->o_tmpmemctx );
1402         uuids[0].bv_val = (char *)(uuids + num + 1);
1403
1404         delcsn[0].bv_len = 0;
1405         delcsn[0].bv_val = cbuf;
1406         BER_BVZERO(&delcsn[1]);
1407
1408         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1409          * and everything else at the end. Do this first so we can
1410          * unlock the list mutex.
1411          */
1412         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1413                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1414         for ( se=sl->sl_head; se; se=se->se_next ) {
1415                 int k;
1416                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1417                 ndel = 1;
1418                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1419                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1420                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1421                                 break;
1422                         }
1423                 }
1424                 if ( ndel <= 0 ) {
1425                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1426                         continue;
1427                 }
1428                 ndel = 0;
1429                 for ( k=0; k<numcsns; k++ ) {
1430                         if ( se->se_sid == sids[k] ) {
1431                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1432                                 break;
1433                         }
1434                 }
1435                 if ( ndel > 0 ) {
1436                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1437                         break;
1438                 }
1439                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1440                         j = i;
1441                         i++;
1442                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1443                         delcsn[0].bv_len = se->se_csn.bv_len;
1444                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1445                 } else {
1446                         nmods++;
1447                         j = num - nmods;
1448                 }
1449                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1450                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1451                 uuids[j].bv_len = UUID_LEN;
1452         }
1453         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1454
1455         ndel = i;
1456
1457         /* Zero out unused slots */
1458         for ( i=ndel; i < num - nmods; i++ )
1459                 uuids[i].bv_len = 0;
1460
1461         /* Mods must be validated to see if they belong in this delete set.
1462          */
1463
1464         mmods = nmods;
1465         /* Strip any duplicates */
1466         for ( i=0; i<nmods; i++ ) {
1467                 for ( j=0; j<ndel; j++ ) {
1468                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1469                                 uuids[num - 1 - i].bv_len = 0;
1470                                 mmods --;
1471                                 break;
1472                         }
1473                 }
1474                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1475                 for ( j=0; j<i; j++ ) {
1476                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1477                                 uuids[num - 1 - i].bv_len = 0;
1478                                 mmods --;
1479                                 break;
1480                         }
1481                 }
1482         }
1483
1484         if ( mmods ) {
1485                 Operation fop;
1486                 SlapReply frs = { REP_RESULT };
1487                 int rc;
1488                 Filter mf, af;
1489                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1490                 slap_callback cb = {0};
1491
1492                 fop = *op;
1493
1494                 fop.o_sync_mode = 0;
1495                 fop.o_callback = &cb;
1496                 fop.ors_limit = NULL;
1497                 fop.ors_tlimit = SLAP_NO_LIMIT;
1498                 fop.ors_attrs = slap_anlist_all_attributes;
1499                 fop.ors_attrsonly = 0;
1500                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1501
1502                 af.f_choice = LDAP_FILTER_AND;
1503                 af.f_next = NULL;
1504                 af.f_and = &mf;
1505                 mf.f_choice = LDAP_FILTER_EQUALITY;
1506                 mf.f_ava = &eq;
1507                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1508                 mf.f_next = fop.ors_filter;
1509
1510                 fop.ors_filter = &af;
1511
1512                 cb.sc_response = playlog_cb;
1513                 fop.o_bd->bd_info = on->on_info->oi_orig;
1514
1515                 for ( i=ndel; i<num; i++ ) {
1516                         if ( uuids[i].bv_len == 0 ) continue;
1517
1518                         mf.f_av_value = uuids[i];
1519                         cb.sc_private = NULL;
1520                         fop.ors_slimit = 1;
1521                         frs.sr_nentries = 0;
1522                         rc = fop.o_bd->be_search( &fop, &frs );
1523
1524                         /* If entry was not found, add to delete list */
1525                         if ( !cb.sc_private ) {
1526                                 uuids[ndel++] = uuids[i];
1527                         }
1528                 }
1529                 fop.o_bd->bd_info = (BackendInfo *)on;
1530         }
1531         if ( ndel ) {
1532                 struct berval cookie;
1533
1534                 slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1535                         srs->sr_state.sid );
1536                 uuids[ndel].bv_val = NULL;
1537                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, &cookie, 0, uuids, 1 );
1538                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1539         }
1540         op->o_tmpfree( uuids, op->o_tmpmemctx );
1541 }
1542
1543 static int
1544 syncprov_op_response( Operation *op, SlapReply *rs )
1545 {
1546         opcookie *opc = op->o_callback->sc_private;
1547         slap_overinst *on = opc->son;
1548         syncprov_info_t         *si = on->on_bi.bi_private;
1549         syncmatches *sm;
1550
1551         if ( rs->sr_err == LDAP_SUCCESS )
1552         {
1553                 struct berval maxcsn = BER_BVNULL;
1554                 char cbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];
1555                 int do_check = 0;
1556
1557                 /* Update our context CSN */
1558                 cbuf[0] = '\0';
1559                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1560                 slap_get_commit_csn( op, &maxcsn );
1561                 if ( !BER_BVISNULL( &maxcsn ) ) {
1562                         int i, sid;
1563                         strcpy( cbuf, maxcsn.bv_val );
1564                         sid = slap_parse_csn_sid( &maxcsn );
1565                         for ( i=0; i<si->si_numcsns; i++ ) {
1566                                 if ( sid == si->si_sids[i] ) {
1567                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1568                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1569                                         }
1570                                         break;
1571                                 }
1572                         }
1573                         /* It's a new SID for us */
1574                         if ( i == si->si_numcsns ) {
1575                                 value_add_one( &si->si_ctxcsn, &maxcsn );
1576                                 si->si_numcsns++;
1577                                 si->si_sids = ch_realloc( si->si_sids, si->si_numcsns *
1578                                         sizeof(int));
1579                                 si->si_sids[i] = sid;
1580                         }
1581                 }
1582
1583                 /* Don't do any processing for consumer contextCSN updates */
1584                 if ( SLAP_SYNC_SHADOW( op->o_bd ) &&
1585                         op->o_msgid == SLAP_SYNC_UPDATE_MSGID ) {
1586                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1587                         return SLAP_CB_CONTINUE;
1588                 }
1589
1590                 si->si_numops++;
1591                 if ( si->si_chkops || si->si_chktime ) {
1592                         if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1593                                 do_check = 1;
1594                                 si->si_numops = 0;
1595                         }
1596                         if ( si->si_chktime &&
1597                                 (op->o_time - si->si_chklast >= si->si_chktime )) {
1598                                 do_check = 1;
1599                                 si->si_chklast = op->o_time;
1600                         }
1601                 }
1602                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1603
1604                 if ( do_check ) {
1605                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1606                         syncprov_checkpoint( op, rs, on );
1607                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1608                 }
1609
1610                 opc->sctxcsn.bv_len = maxcsn.bv_len;
1611                 opc->sctxcsn.bv_val = cbuf;
1612
1613                 /* Handle any persistent searches */
1614                 if ( si->si_ops ) {
1615                         switch(op->o_tag) {
1616                         case LDAP_REQ_ADD:
1617                         case LDAP_REQ_MODIFY:
1618                         case LDAP_REQ_MODRDN:
1619                         case LDAP_REQ_EXTENDED:
1620                                 syncprov_matchops( op, opc, 0 );
1621                                 break;
1622                         case LDAP_REQ_DELETE:
1623                                 /* for each match in opc->smatches:
1624                                  *   send DELETE msg
1625                                  */
1626                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1627                                         if ( sm->sm_op->s_op->o_abandon )
1628                                                 continue;
1629                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1630                                 }
1631                                 break;
1632                         }
1633                 }
1634
1635                 /* Add any log records */
1636                 if ( si->si_logs && op->o_tag != LDAP_REQ_ADD ) {
1637                         syncprov_add_slog( op );
1638                 }
1639
1640         }
1641         return SLAP_CB_CONTINUE;
1642 }
1643
1644 /* We don't use a subentry to store the context CSN any more.
1645  * We expose the current context CSN as an operational attribute
1646  * of the suffix entry.
1647  */
1648 static int
1649 syncprov_op_compare( Operation *op, SlapReply *rs )
1650 {
1651         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1652         syncprov_info_t         *si = on->on_bi.bi_private;
1653         int rc = SLAP_CB_CONTINUE;
1654
1655         if ( dn_match( &op->o_req_ndn, op->o_bd->be_nsuffix ) &&
1656                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1657         {
1658                 Entry e = {0};
1659                 Attribute a = {0};
1660
1661                 e.e_name = op->o_bd->be_suffix[0];
1662                 e.e_nname = op->o_bd->be_nsuffix[0];
1663                 e.e_attrs = &a;
1664
1665                 a.a_desc = slap_schema.si_ad_contextCSN;
1666
1667                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1668
1669                 a.a_vals = si->si_ctxcsn;
1670                 a.a_nvals = a.a_vals;
1671
1672                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1673                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1674                 if ( ! rs->sr_err ) {
1675                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1676                         goto return_results;
1677                 }
1678
1679                 if ( get_assert( op ) &&
1680                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1681                 {
1682                         rs->sr_err = LDAP_ASSERTION_FAILED;
1683                         goto return_results;
1684                 }
1685
1686
1687                 rs->sr_err = LDAP_COMPARE_FALSE;
1688
1689                 if ( attr_valfind( &a,
1690                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
1691                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
1692                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
1693                 {
1694                         rs->sr_err = LDAP_COMPARE_TRUE;
1695                 }
1696
1697 return_results:;
1698
1699                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1700
1701                 send_ldap_result( op, rs );
1702
1703                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
1704                         rs->sr_err = LDAP_SUCCESS;
1705                 }
1706                 rc = rs->sr_err;
1707         }
1708
1709         return rc;
1710 }
1711
1712 static int
1713 syncprov_op_mod( Operation *op, SlapReply *rs )
1714 {
1715         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1716         syncprov_info_t         *si = on->on_bi.bi_private;
1717
1718         slap_callback *cb = op->o_tmpcalloc(1, sizeof(slap_callback)+
1719                 sizeof(opcookie) +
1720                 (si->si_ops ? sizeof(modinst) : 0 ),
1721                 op->o_tmpmemctx);
1722         opcookie *opc = (opcookie *)(cb+1);
1723         opc->son = on;
1724         cb->sc_response = syncprov_op_response;
1725         cb->sc_cleanup = syncprov_op_cleanup;
1726         cb->sc_private = opc;
1727         cb->sc_next = op->o_callback;
1728         op->o_callback = cb;
1729
1730         /* If there are active persistent searches, lock this operation.
1731          * See seqmod.c for the locking logic on its own.
1732          */
1733         if ( si->si_ops ) {
1734                 modtarget *mt, mtdummy;
1735                 modinst *mi;
1736
1737                 mi = (modinst *)(opc+1);
1738                 mi->mi_op = op;
1739
1740                 /* See if we're already modifying this entry... */
1741                 mtdummy.mt_op = op;
1742                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1743                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
1744                 if ( mt ) {
1745                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1746                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1747                         mt->mt_tail->mi_next = mi;
1748                         mt->mt_tail = mi;
1749                         /* wait for this op to get to head of list */
1750                         while ( mt->mt_mods != mi ) {
1751                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1752                                 ldap_pvt_thread_yield();
1753                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1754
1755                                 /* clean up if the caller is giving up */
1756                                 if ( op->o_abandon ) {
1757                                         modinst *m2;
1758                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
1759                                                 m2 = m2->mi_next );
1760                                         m2->mi_next = mi->mi_next;
1761                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
1762                                         op->o_tmpfree( cb, op->o_tmpmemctx );
1763                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1764                                         return SLAPD_ABANDON;
1765                                 }
1766                         }
1767                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1768                 } else {
1769                         /* Record that we're modifying this entry now */
1770                         mt = ch_malloc( sizeof(modtarget) );
1771                         mt->mt_mods = mi;
1772                         mt->mt_tail = mi;
1773                         mt->mt_op = mi->mi_op;
1774                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
1775                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
1776                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1777                 }
1778         }
1779
1780         if (( si->si_ops || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
1781                 syncprov_matchops( op, opc, 1 );
1782
1783         return SLAP_CB_CONTINUE;
1784 }
1785
1786 static int
1787 syncprov_op_extended( Operation *op, SlapReply *rs )
1788 {
1789         if ( exop_is_write( op ))
1790                 return syncprov_op_mod( op, rs );
1791
1792         return SLAP_CB_CONTINUE;
1793 }
1794
1795 typedef struct searchstate {
1796         slap_overinst *ss_on;
1797         syncops *ss_so;
1798         BerVarray ss_ctxcsn;
1799         int *ss_sids;
1800         int ss_numcsns;
1801         int ss_present;
1802 } searchstate;
1803
1804 static int
1805 syncprov_search_cleanup( Operation *op, SlapReply *rs )
1806 {
1807         if ( rs->sr_ctrls ) {
1808                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
1809                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
1810                 rs->sr_ctrls = NULL;
1811         }
1812         return 0;
1813 }
1814
1815 typedef struct SyncOperationBuffer {
1816         Operation               sob_op;
1817         Opheader                sob_hdr;
1818         AttributeName   sob_extra;      /* not always present */
1819         /* Further data allocated here */
1820 } SyncOperationBuffer;
1821
1822 static void
1823 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
1824 {
1825         SyncOperationBuffer *sopbuf2;
1826         Operation *op2;
1827         int i, alen = 0;
1828         size_t size;
1829         char *ptr;
1830         GroupAssertion *g1, *g2;
1831
1832         /* count the search attrs */
1833         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1834                 alen += op->ors_attrs[i].an_name.bv_len + 1;
1835         }
1836         /* Make a new copy of the operation */
1837         size = offsetof( SyncOperationBuffer, sob_extra ) +
1838                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
1839                 op->o_req_dn.bv_len + 1 +
1840                 op->o_req_ndn.bv_len + 1 +
1841                 op->o_ndn.bv_len + 1 +
1842                 so->s_filterstr.bv_len + 1;
1843         sopbuf2 = ch_calloc( 1, size );
1844         op2 = &sopbuf2->sob_op;
1845         op2->o_hdr = &sopbuf2->sob_hdr;
1846
1847         /* Copy the fields we care about explicitly, leave the rest alone */
1848         *op2->o_hdr = *op->o_hdr;
1849         op2->o_tag = op->o_tag;
1850         op2->o_time = op->o_time;
1851         op2->o_bd = on->on_info->oi_origdb;
1852         op2->o_request = op->o_request;
1853         op2->o_private = on;
1854
1855         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
1856         if ( i ) {
1857                 op2->ors_attrs = (AttributeName *) ptr;
1858                 ptr = (char *) &op2->ors_attrs[i+1];
1859                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
1860                         op2->ors_attrs[i] = op->ors_attrs[i];
1861                         op2->ors_attrs[i].an_name.bv_val = ptr;
1862                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
1863                 }
1864                 BER_BVZERO( &op2->ors_attrs[i].an_name );
1865         }
1866
1867         op2->o_authz = op->o_authz;
1868         op2->o_ndn.bv_val = ptr;
1869         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
1870         op2->o_dn = op2->o_ndn;
1871         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
1872         op2->o_req_dn.bv_val = ptr;
1873         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
1874         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
1875         op2->o_req_ndn.bv_val = ptr;
1876         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
1877         op2->ors_filterstr.bv_val = ptr;
1878         strcpy( ptr, so->s_filterstr.bv_val );
1879         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
1880
1881         /* Skip the AND/GE clause that we stuck on in front */
1882         if ( so->s_flags & PS_FIX_FILTER ) {
1883                 op2->ors_filter = op->ors_filter->f_and->f_next;
1884                 so->s_flags ^= PS_FIX_FILTER;
1885         } else {
1886                 op2->ors_filter = op->ors_filter;
1887         }
1888         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
1889         so->s_op = op2;
1890
1891         /* Copy any cached group ACLs individually */
1892         op2->o_groups = NULL;
1893         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
1894                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
1895                 *g2 = *g1;
1896                 strcpy( g2->ga_ndn, g1->ga_ndn );
1897                 g2->ga_next = op2->o_groups;
1898                 op2->o_groups = g2;
1899         }
1900         /* Don't allow any further group caching */
1901         op2->o_do_not_cache = 1;
1902
1903         /* Add op2 to conn so abandon will find us */
1904         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
1905         op->o_conn->c_n_ops_executing++;
1906         op->o_conn->c_n_ops_completed--;
1907         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
1908         so->s_flags |= PS_IS_DETACHED;
1909         ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
1910
1911         /* Prevent anyone else from trying to send a result for this op */
1912         op->o_abandon = 1;
1913 }
1914
1915 static int
1916 syncprov_search_response( Operation *op, SlapReply *rs )
1917 {
1918         searchstate *ss = op->o_callback->sc_private;
1919         slap_overinst *on = ss->ss_on;
1920         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
1921
1922         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
1923                 Attribute *a;
1924                 /* If we got a referral without a referral object, there's
1925                  * something missing that we cannot replicate. Just ignore it.
1926                  * The consumer will abort because we didn't send the expected
1927                  * control.
1928                  */
1929                 if ( !rs->sr_entry ) {
1930                         assert( rs->sr_entry != NULL );
1931                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
1932                         return SLAP_CB_CONTINUE;
1933                 }
1934                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
1935                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
1936                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
1937                 }
1938                 if ( a ) {
1939                         int i, sid;
1940                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
1941
1942                         /* Don't send changed entries back to the originator */
1943                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
1944                                 Debug( LDAP_DEBUG_SYNC,
1945                                         "Entry %s changed by peer, ignored\n",
1946                                         rs->sr_entry->e_name.bv_val, 0, 0 );
1947                                 return LDAP_SUCCESS;
1948                         }
1949                         /* Make sure entry is less than the snapshot'd contextCSN */
1950                         for ( i=0; i<ss->ss_numcsns; i++ ) {
1951                                 if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
1952                                         &ss->ss_ctxcsn[i] ) > 0 ) {
1953                                         Debug( LDAP_DEBUG_SYNC,
1954                                                 "Entry %s CSN %s greater than snapshot %s\n",
1955                                                 rs->sr_entry->e_name.bv_val,
1956                                                 a->a_nvals[0].bv_val,
1957                                                 ss->ss_ctxcsn[i].bv_val );
1958                                         return LDAP_SUCCESS;
1959                                 }
1960                         }
1961
1962                         /* Don't send old entries twice */
1963                         if ( srs->sr_state.ctxcsn ) {
1964                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
1965                                         if ( sid == srs->sr_state.sids[i] &&
1966                                                 ber_bvcmp( &a->a_nvals[0],
1967                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
1968                                                 Debug( LDAP_DEBUG_SYNC,
1969                                                         "Entry %s CSN %s older or equal to ctx %s\n",
1970                                                         rs->sr_entry->e_name.bv_val,
1971                                                         a->a_nvals[0].bv_val,
1972                                                         srs->sr_state.ctxcsn[i].bv_val );
1973                                                 return LDAP_SUCCESS;
1974                                         }
1975                                 }
1976                         }
1977                 }
1978                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1979                         op->o_tmpmemctx );
1980                 rs->sr_ctrls[1] = NULL;
1981                 rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
1982                         LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
1983         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
1984                 struct berval cookie;
1985
1986                 slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
1987                         srs->sr_state.rid, srs->sr_state.sid );
1988
1989                 /* Is this a regular refresh? */
1990                 if ( !ss->ss_so ) {
1991                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
1992                                 op->o_tmpmemctx );
1993                         rs->sr_ctrls[1] = NULL;
1994                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
1995                                 0, 1, &cookie, ss->ss_present ?  LDAP_SYNC_REFRESH_PRESENTS :
1996                                         LDAP_SYNC_REFRESH_DELETES );
1997                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1998                 } else {
1999                 /* It's RefreshAndPersist, transition to Persist phase */
2000                         syncprov_sendinfo( op, rs, ss->ss_present ?
2001                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2002                                 &cookie, 1, NULL, 0 );
2003                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2004
2005                         /* Detach this Op from frontend control */
2006                         ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2007
2008                         /* Turn off the refreshing flag */
2009                         ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2010
2011                         syncprov_detach_op( op, ss->ss_so, on );
2012
2013                         /* If there are queued responses, fire them off */
2014                         if ( ss->ss_so->s_res )
2015                                 syncprov_qstart( ss->ss_so );
2016                         ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2017
2018                         return LDAP_SUCCESS;
2019                 }
2020         }
2021
2022         return SLAP_CB_CONTINUE;
2023 }
2024
2025 static int
2026 syncprov_op_search( Operation *op, SlapReply *rs )
2027 {
2028         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2029         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2030         slap_callback   *cb;
2031         int gotstate = 0, nochange = 0, do_present;
2032         syncops *sop = NULL;
2033         searchstate *ss;
2034         sync_control *srs;
2035         BerVarray ctxcsn;
2036         int i, *sids, numcsns;
2037         struct berval mincsn;
2038
2039         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2040
2041         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2042                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2043                 return rs->sr_err;
2044         }
2045
2046         do_present = si->si_nopres ? 0 : 1;
2047
2048         srs = op->o_controls[slap_cids.sc_LDAPsync];
2049         op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
2050
2051         /* If this is a persistent search, set it up right away */
2052         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2053                 syncops so = {0};
2054                 fbase_cookie fc;
2055                 opcookie opc;
2056                 slap_callback sc;
2057
2058                 fc.fss = &so;
2059                 fc.fbase = 0;
2060                 so.s_eid = NOID;
2061                 so.s_op = op;
2062                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2063                 /* syncprov_findbase expects to be called as a callback... */
2064                 sc.sc_private = &opc;
2065                 opc.son = on;
2066                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2067                 cb = op->o_callback;
2068                 op->o_callback = &sc;
2069                 rs->sr_err = syncprov_findbase( op, &fc );
2070                 op->o_callback = cb;
2071                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2072
2073                 if ( rs->sr_err != LDAP_SUCCESS ) {
2074                         send_ldap_result( op, rs );
2075                         return rs->sr_err;
2076                 }
2077                 sop = ch_malloc( sizeof( syncops ));
2078                 *sop = so;
2079                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2080                 sop->s_rid = srs->sr_state.rid;
2081                 sop->s_sid = srs->sr_state.sid;
2082                 sop->s_inuse = 1;
2083
2084                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2085                 sop->s_next = si->si_ops;
2086                 si->si_ops = sop;
2087                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2088         }
2089
2090         /* snapshot the ctxcsn */
2091         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2092         numcsns = si->si_numcsns;
2093         if ( numcsns ) {
2094                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2095                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2096                 for ( i=0; i<numcsns; i++ )
2097                         sids[i] = si->si_sids[i];
2098         } else {
2099                 ctxcsn = NULL;
2100                 sids = NULL;
2101         }
2102         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2103
2104         /* If we have a cookie, handle the PRESENT lookups */
2105         if ( srs->sr_state.ctxcsn ) {
2106                 sessionlog *sl;
2107                 int i, j;
2108
2109                 /* If we don't have any CSN of our own yet, pretend nothing
2110                  * has changed.
2111                  */
2112                 if ( !numcsns )
2113                         goto no_change;
2114
2115                 /* If there are SIDs we don't recognize in the cookie, drop them */
2116                 for (i=0; i<srs->sr_state.numcsns; ) {
2117                         for (j=0; j<numcsns; j++) {
2118                                 if ( srs->sr_state.sids[i] == sids[j] ) {
2119                                         break;
2120                                 }
2121                         }
2122                         /* not found */
2123                         if ( j == numcsns ) {
2124                                 struct berval tmp = srs->sr_state.ctxcsn[i];
2125                                 j = srs->sr_state.numcsns - 1;
2126                                 srs->sr_state.ctxcsn[i] = srs->sr_state.ctxcsn[j];
2127                                 tmp.bv_len = 0;
2128                                 srs->sr_state.ctxcsn[j] = tmp;
2129                                 srs->sr_state.numcsns = j;
2130                                 srs->sr_state.sids[i] = srs->sr_state.sids[j];
2131                                 continue;
2132                         }
2133                         i++;
2134                 }
2135
2136                 /* Find the smallest CSN */
2137                 mincsn = srs->sr_state.ctxcsn[0];
2138                 for ( i=1; i<srs->sr_state.numcsns; i++ ) {
2139                         if ( ber_bvcmp( &mincsn, &srs->sr_state.ctxcsn[i] ) > 0 )
2140                                 mincsn = srs->sr_state.ctxcsn[i];
2141                 }
2142
2143                 /* If nothing has changed, shortcut it */
2144                 if ( srs->sr_state.numcsns == numcsns ) {
2145                         int i, j, changed = 0;
2146                         for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2147                                 for ( j=0; j<numcsns; j++ ) {
2148                                         if ( srs->sr_state.sids[i] != sids[j] )
2149                                                 continue;
2150                                         if ( !bvmatch( &srs->sr_state.ctxcsn[i], &ctxcsn[j] ))
2151                                                 changed = 1;
2152                                         break;
2153                                 }
2154                                 if ( changed )
2155                                         break;
2156                         }
2157                         if ( !changed ) {
2158 no_change:              nochange = 1;
2159                                 if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2160                                         LDAPControl     *ctrls[2];
2161
2162                                         ctrls[0] = NULL;
2163                                         ctrls[1] = NULL;
2164                                         syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2165                                                 NULL, LDAP_SYNC_REFRESH_DELETES );
2166                                         rs->sr_ctrls = ctrls;
2167                                         rs->sr_err = LDAP_SUCCESS;
2168                                         send_ldap_result( op, rs );
2169                                         rs->sr_ctrls = NULL;
2170                                         return rs->sr_err;
2171                                 }
2172                                 goto shortcut;
2173                         }
2174                 }
2175                 /* Do we have a sessionlog for this search? */
2176                 sl=si->si_logs;
2177                 if ( sl ) {
2178                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2179                         /* Are there any log entries, and is the consumer state
2180                          * present in the session log?
2181                          */
2182                         if ( sl->sl_num > 0 && ber_bvcmp( &mincsn, &sl->sl_mincsn ) >= 0 ) {
2183                                 do_present = 0;
2184                                 /* mutex is unlocked in playlog */
2185                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2186                         } else {
2187                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2188                         }
2189                 }
2190                 /* Is the CSN still present in the database? */
2191                 if ( syncprov_findcsn( op, FIND_CSN ) != LDAP_SUCCESS ) {
2192                         /* No, so a reload is required */
2193                         /* the 2.2 consumer doesn't send this hint */
2194                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2195                                 if ( ctxcsn )
2196                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2197                                 send_ldap_error( op, rs, LDAP_SYNC_REFRESH_REQUIRED, "sync cookie is stale" );
2198                                 return rs->sr_err;
2199                         }
2200                 } else {
2201                         gotstate = 1;
2202                         /* If changed and doing Present lookup, send Present UUIDs */
2203                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT ) !=
2204                                 LDAP_SUCCESS ) {
2205                                 if ( ctxcsn )
2206                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2207                                 send_ldap_result( op, rs );
2208                                 return rs->sr_err;
2209                         }
2210                 }
2211         }
2212
2213 shortcut:
2214         /* Append CSN range to search filter, save original filter
2215          * for persistent search evaluation
2216          */
2217         if ( sop ) {
2218                 sop->s_filterstr= op->ors_filterstr;
2219         }
2220
2221         /* If something changed, find the changes */
2222         if ( gotstate && !nochange ) {
2223                 Filter *fand, *fava;
2224
2225                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2226                 fand->f_choice = LDAP_FILTER_AND;
2227                 fand->f_next = NULL;
2228                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2229                 fand->f_and = fava;
2230                 fava->f_choice = LDAP_FILTER_GE;
2231                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2232                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2233 #ifdef LDAP_COMP_MATCH
2234                 fava->f_ava->aa_cf = NULL;
2235 #endif
2236                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2237                 fava->f_next = op->ors_filter;
2238                 op->ors_filter = fand;
2239                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2240                 if ( sop )
2241                         sop->s_flags |= PS_FIX_FILTER;
2242         }
2243
2244         /* Let our callback add needed info to returned entries */
2245         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2246         ss = (searchstate *)(cb+1);
2247         ss->ss_on = on;
2248         ss->ss_so = sop;
2249         ss->ss_present = do_present;
2250         ss->ss_ctxcsn = ctxcsn;
2251         ss->ss_numcsns = numcsns;
2252         ss->ss_sids = sids;
2253         cb->sc_response = syncprov_search_response;
2254         cb->sc_cleanup = syncprov_search_cleanup;
2255         cb->sc_private = ss;
2256         cb->sc_next = op->o_callback;
2257         op->o_callback = cb;
2258
2259         /* If this is a persistent search and no changes were reported during
2260          * the refresh phase, just invoke the response callback to transition
2261          * us into persist phase
2262          */
2263         if ( nochange ) {
2264                 rs->sr_err = LDAP_SUCCESS;
2265                 rs->sr_nentries = 0;
2266                 send_ldap_result( op, rs );
2267                 return rs->sr_err;
2268         }
2269         return SLAP_CB_CONTINUE;
2270 }
2271
2272 static int
2273 syncprov_operational(
2274         Operation *op,
2275         SlapReply *rs )
2276 {
2277         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2278         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2279
2280         if ( rs->sr_entry &&
2281                 dn_match( &rs->sr_entry->e_nname, op->o_bd->be_nsuffix )) {
2282
2283                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2284                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2285                         Attribute *a, **ap = NULL;
2286
2287                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2288                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2289                                         break;
2290                         }
2291
2292                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2293                         if ( si->si_ctxcsn ) {
2294                                 if ( !a ) {
2295                                         for ( ap = &rs->sr_operational_attrs; *ap;
2296                                                 ap=&(*ap)->a_next );
2297
2298                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2299                                         *ap = a;
2300                                 }
2301
2302                                 if ( !ap ) {
2303                                         if ( !rs->sr_flags & REP_ENTRY_MODIFIABLE ) {
2304                                                 rs->sr_entry = entry_dup( rs->sr_entry );
2305                                                 rs->sr_flags |=
2306                                                         REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTBEFREED;
2307                                                 a = attr_find( rs->sr_entry->e_attrs,
2308                                                         slap_schema.si_ad_contextCSN );
2309                                         }
2310                                         if ( a->a_nvals != a->a_vals ) {
2311                                                 ber_bvarray_free( a->a_nvals );
2312                                         }
2313                                         a->a_nvals = NULL;
2314                                         ber_bvarray_free( a->a_vals );
2315                                         a->a_vals = NULL;
2316                                         a->a_numvals = 0;
2317                                 }
2318                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2319                         }
2320                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2321                 }
2322         }
2323         return SLAP_CB_CONTINUE;
2324 }
2325
2326 enum {
2327         SP_CHKPT = 1,
2328         SP_SESSL,
2329         SP_NOPRES,
2330         SP_USEHINT
2331 };
2332
2333 static ConfigDriver sp_cf_gen;
2334
2335 static ConfigTable spcfg[] = {
2336         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2337                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2338                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2339                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2340         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2341                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2342                         "DESC 'Session log size in ops' "
2343                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2344         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2345                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2346                         "DESC 'Omit Present phase processing' "
2347                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2348         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2349                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2350                         "DESC 'Observe Reload Hint in Request control' "
2351                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2352         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2353 };
2354
2355 static ConfigOCs spocs[] = {
2356         { "( OLcfgOvOc:1.1 "
2357                 "NAME 'olcSyncProvConfig' "
2358                 "DESC 'SyncRepl Provider configuration' "
2359                 "SUP olcOverlayConfig "
2360                 "MAY ( olcSpCheckpoint $ olcSpSessionlog $ olcSpNoPresent ) )",
2361                         Cft_Overlay, spcfg },
2362         { NULL, 0, NULL }
2363 };
2364
2365 static int
2366 sp_cf_gen(ConfigArgs *c)
2367 {
2368         slap_overinst           *on = (slap_overinst *)c->bi;
2369         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2370         int rc = 0;
2371
2372         if ( c->op == SLAP_CONFIG_EMIT ) {
2373                 switch ( c->type ) {
2374                 case SP_CHKPT:
2375                         if ( si->si_chkops || si->si_chktime ) {
2376                                 struct berval bv;
2377                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2378                                         "%d %d", si->si_chkops, si->si_chktime );
2379                                 if ( bv.bv_len < 0 || bv.bv_len >= sizeof( c->cr_msg ) ) {
2380                                         rc = 1;
2381                                 } else {
2382                                         bv.bv_val = c->cr_msg;
2383                                         value_add_one( &c->rvalue_vals, &bv );
2384                                 }
2385                         } else {
2386                                 rc = 1;
2387                         }
2388                         break;
2389                 case SP_SESSL:
2390                         if ( si->si_logs ) {
2391                                 c->value_int = si->si_logs->sl_size;
2392                         } else {
2393                                 rc = 1;
2394                         }
2395                         break;
2396                 case SP_NOPRES:
2397                         if ( si->si_nopres ) {
2398                                 c->value_int = 1;
2399                         } else {
2400                                 rc = 1;
2401                         }
2402                         break;
2403                 case SP_USEHINT:
2404                         if ( si->si_usehint ) {
2405                                 c->value_int = 1;
2406                         } else {
2407                                 rc = 1;
2408                         }
2409                         break;
2410                 }
2411                 return rc;
2412         } else if ( c->op == LDAP_MOD_DELETE ) {
2413                 switch ( c->type ) {
2414                 case SP_CHKPT:
2415                         si->si_chkops = 0;
2416                         si->si_chktime = 0;
2417                         break;
2418                 case SP_SESSL:
2419                         if ( si->si_logs )
2420                                 si->si_logs->sl_size = 0;
2421                         else
2422                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2423                         break;
2424                 case SP_NOPRES:
2425                         if ( si->si_nopres )
2426                                 si->si_nopres = 0;
2427                         else
2428                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2429                         break;
2430                 case SP_USEHINT:
2431                         if ( si->si_usehint )
2432                                 si->si_usehint = 0;
2433                         else
2434                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2435                         break;
2436                 }
2437                 return rc;
2438         }
2439         switch ( c->type ) {
2440         case SP_CHKPT:
2441                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2442                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2443                                 c->argv[0], c->argv[1] );
2444                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2445                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2446                         return ARG_BAD_CONF;
2447                 }
2448                 if ( si->si_chkops <= 0 ) {
2449                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2450                                 c->argv[0], si->si_chkops );
2451                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2452                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2453                         return ARG_BAD_CONF;
2454                 }
2455                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2456                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2457                                 c->argv[0], c->argv[1] );
2458                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2459                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2460                         return ARG_BAD_CONF;
2461                 }
2462                 if ( si->si_chktime <= 0 ) {
2463                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2464                                 c->argv[0], si->si_chkops );
2465                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2466                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2467                         return ARG_BAD_CONF;
2468                 }
2469                 si->si_chktime *= 60;
2470                 break;
2471         case SP_SESSL: {
2472                 sessionlog *sl;
2473                 int size = c->value_int;
2474
2475                 if ( size < 0 ) {
2476                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2477                                 c->argv[0], size );
2478                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2479                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2480                         return ARG_BAD_CONF;
2481                 }
2482                 sl = si->si_logs;
2483                 if ( !sl ) {
2484                         sl = ch_malloc( sizeof( sessionlog ) + LDAP_LUTIL_CSNSTR_BUFSIZE );
2485                         sl->sl_mincsn.bv_val = (char *)(sl+1);
2486                         sl->sl_mincsn.bv_len = 0;
2487                         sl->sl_num = 0;
2488                         sl->sl_head = sl->sl_tail = NULL;
2489                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2490                         si->si_logs = sl;
2491                 }
2492                 sl->sl_size = size;
2493                 }
2494                 break;
2495         case SP_NOPRES:
2496                 si->si_nopres = c->value_int;
2497                 break;
2498         case SP_USEHINT:
2499                 si->si_usehint = c->value_int;
2500                 break;
2501         }
2502         return rc;
2503 }
2504
2505 /* ITS#3456 we cannot run this search on the main thread, must use a
2506  * child thread in order to insure we have a big enough stack.
2507  */
2508 static void *
2509 syncprov_db_otask(
2510         void *ptr
2511 )
2512 {
2513         syncprov_findcsn( ptr, FIND_MAXCSN );
2514         return NULL;
2515 }
2516
2517 /* Read any existing contextCSN from the underlying db.
2518  * Then search for any entries newer than that. If no value exists,
2519  * just generate it. Cache whatever result.
2520  */
2521 static int
2522 syncprov_db_open(
2523         BackendDB *be,
2524         ConfigReply *cr
2525 )
2526 {
2527         slap_overinst   *on = (slap_overinst *) be->bd_info;
2528         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2529
2530         Connection conn = { 0 };
2531         OperationBuffer opbuf;
2532         Operation *op;
2533         Entry *e = NULL;
2534         Attribute *a;
2535         int rc;
2536         void *thrctx = NULL;
2537
2538         if ( !SLAP_LASTMOD( be )) {
2539                 Debug( LDAP_DEBUG_ANY,
2540                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
2541                 return -1;
2542         }
2543
2544         if ( slapMode & SLAP_TOOL_MODE ) {
2545                 return 0;
2546         }
2547
2548         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
2549         if ( rc ) {
2550                 return rc;
2551         }
2552
2553         thrctx = ldap_pvt_thread_pool_context();
2554         connection_fake_init( &conn, &opbuf, thrctx );
2555         op = &opbuf.ob_op;
2556         op->o_bd = be;
2557         op->o_dn = be->be_rootdn;
2558         op->o_ndn = be->be_rootndn;
2559
2560         rc = overlay_entry_get_ov( op, be->be_nsuffix, NULL,
2561                 slap_schema.si_ad_contextCSN, 0, &e, on );
2562
2563         if ( e ) {
2564                 ldap_pvt_thread_t tid;
2565
2566                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
2567                 if ( a ) {
2568                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
2569                         si->si_numcsns = a->a_numvals;
2570                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
2571                 }
2572                 overlay_entry_release_ov( op, e, 0, on );
2573                 if ( si->si_ctxcsn ) {
2574                         op->o_req_dn = be->be_suffix[0];
2575                         op->o_req_ndn = be->be_nsuffix[0];
2576                         op->ors_scope = LDAP_SCOPE_SUBTREE;
2577                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
2578                         ldap_pvt_thread_join( tid, NULL );
2579                 }
2580         }
2581
2582         /* Didn't find a contextCSN, should we generate one? */
2583         if ( !si->si_ctxcsn ) {
2584                 char csnbuf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
2585                 struct berval csn;
2586
2587                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
2588                 /* If we're also a consumer, then don't generate anything.
2589                  * Wait for our provider to send it to us, or for a local
2590                  * modify if we have multimaster.
2591                  */
2592                         goto out;
2593                 }
2594                 csn.bv_val = csnbuf;
2595                 csn.bv_len = sizeof( csnbuf );
2596                 slap_get_csn( op, &csn, 0 );
2597                 value_add_one( &si->si_ctxcsn, &csn );
2598                 si->si_numcsns = 1;
2599                 si->si_sids = ch_malloc( sizeof(int) );
2600                 si->si_sids[0] = slap_serverID;
2601
2602                 /* make sure we do a checkpoint on close */
2603                 si->si_numops++;
2604         }
2605
2606 out:
2607         op->o_bd->bd_info = (BackendInfo *)on;
2608         return 0;
2609 }
2610
2611 /* Write the current contextCSN into the underlying db.
2612  */
2613 static int
2614 syncprov_db_close(
2615         BackendDB *be,
2616         ConfigReply *cr
2617 )
2618 {
2619     slap_overinst   *on = (slap_overinst *) be->bd_info;
2620     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2621
2622         if ( slapMode & SLAP_TOOL_MODE ) {
2623                 return 0;
2624         }
2625         if ( si->si_numops ) {
2626                 Connection conn = {0};
2627                 OperationBuffer opbuf;
2628                 Operation *op;
2629                 SlapReply rs = {REP_RESULT};
2630                 void *thrctx;
2631
2632                 thrctx = ldap_pvt_thread_pool_context();
2633                 connection_fake_init( &conn, &opbuf, thrctx );
2634                 op = &opbuf.ob_op;
2635                 op->o_bd = be;
2636                 op->o_dn = be->be_rootdn;
2637                 op->o_ndn = be->be_rootndn;
2638                 syncprov_checkpoint( op, &rs, on );
2639         }
2640
2641     return 0;
2642 }
2643
2644 static int
2645 syncprov_db_init(
2646         BackendDB *be,
2647         ConfigReply *cr
2648 )
2649 {
2650         slap_overinst   *on = (slap_overinst *)be->bd_info;
2651         syncprov_info_t *si;
2652
2653         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
2654                 Debug( LDAP_DEBUG_ANY,
2655                         "syncprov must be instantiated within a database.\n",
2656                         0, 0, 0 );
2657                 return 1;
2658         }
2659
2660         si = ch_calloc(1, sizeof(syncprov_info_t));
2661         on->on_bi.bi_private = si;
2662         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
2663         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
2664         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
2665
2666         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
2667         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
2668         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
2669         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2670
2671         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
2672         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
2673
2674         return 0;
2675 }
2676
2677 static int
2678 syncprov_db_destroy(
2679         BackendDB *be,
2680         ConfigReply *cr
2681 )
2682 {
2683         slap_overinst   *on = (slap_overinst *)be->bd_info;
2684         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2685
2686         if ( si ) {
2687                 if ( si->si_logs ) {
2688                         slog_entry *se = si->si_logs->sl_head;
2689
2690                         while ( se ) {
2691                                 slog_entry *se_next = se->se_next;
2692                                 ch_free( se );
2693                                 se = se_next;
2694                         }
2695
2696                         ch_free( si->si_logs );
2697                 }
2698                 if ( si->si_ctxcsn )
2699                         ber_bvarray_free( si->si_ctxcsn );
2700                 if ( si->si_sids )
2701                         ch_free( si->si_sids );
2702                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
2703                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
2704                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
2705                 ch_free( si );
2706         }
2707
2708         return 0;
2709 }
2710
2711 static int syncprov_parseCtrl (
2712         Operation *op,
2713         SlapReply *rs,
2714         LDAPControl *ctrl )
2715 {
2716         ber_tag_t tag;
2717         BerElementBuffer berbuf;
2718         BerElement *ber = (BerElement *)&berbuf;
2719         ber_int_t mode;
2720         ber_len_t len;
2721         struct berval cookie = BER_BVNULL;
2722         sync_control *sr;
2723         int rhint = 0;
2724
2725         if ( op->o_sync != SLAP_CONTROL_NONE ) {
2726                 rs->sr_text = "Sync control specified multiple times";
2727                 return LDAP_PROTOCOL_ERROR;
2728         }
2729
2730         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
2731                 rs->sr_text = "Sync control specified with pagedResults control";
2732                 return LDAP_PROTOCOL_ERROR;
2733         }
2734
2735         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
2736                 rs->sr_text = "Sync control value is absent";
2737                 return LDAP_PROTOCOL_ERROR;
2738         }
2739
2740         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
2741                 rs->sr_text = "Sync control value is empty";
2742                 return LDAP_PROTOCOL_ERROR;
2743         }
2744
2745         /* Parse the control value
2746          *      syncRequestValue ::= SEQUENCE {
2747          *              mode   ENUMERATED {
2748          *                      -- 0 unused
2749          *                      refreshOnly             (1),
2750          *                      -- 2 reserved
2751          *                      refreshAndPersist       (3)
2752          *              },
2753          *              cookie  syncCookie OPTIONAL
2754          *      }
2755          */
2756
2757         ber_init2( ber, &ctrl->ldctl_value, 0 );
2758
2759         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
2760                 rs->sr_text = "Sync control : mode decoding error";
2761                 return LDAP_PROTOCOL_ERROR;
2762         }
2763
2764         switch( mode ) {
2765         case LDAP_SYNC_REFRESH_ONLY:
2766                 mode = SLAP_SYNC_REFRESH;
2767                 break;
2768         case LDAP_SYNC_REFRESH_AND_PERSIST:
2769                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
2770                 break;
2771         default:
2772                 rs->sr_text = "Sync control : unknown update mode";
2773                 return LDAP_PROTOCOL_ERROR;
2774         }
2775
2776         tag = ber_peek_tag( ber, &len );
2777
2778         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
2779                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
2780                         rs->sr_text = "Sync control : cookie decoding error";
2781                         return LDAP_PROTOCOL_ERROR;
2782                 }
2783                 tag = ber_peek_tag( ber, &len );
2784         }
2785         if ( tag == LDAP_TAG_RELOAD_HINT ) {
2786                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
2787                         rs->sr_text = "Sync control : rhint decoding error";
2788                         return LDAP_PROTOCOL_ERROR;
2789                 }
2790         }
2791         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
2792                         rs->sr_text = "Sync control : decoding error";
2793                         return LDAP_PROTOCOL_ERROR;
2794         }
2795         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
2796         sr->sr_rhint = rhint;
2797         if (!BER_BVISNULL(&cookie)) {
2798                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
2799                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
2800                         sr->sr_state.rid == -1 ) {
2801                         rs->sr_text = "Sync control : cookie parsing error";
2802                         return LDAP_PROTOCOL_ERROR;
2803                 }
2804         }
2805
2806         op->o_controls[slap_cids.sc_LDAPsync] = sr;
2807
2808         op->o_sync = ctrl->ldctl_iscritical
2809                 ? SLAP_CONTROL_CRITICAL
2810                 : SLAP_CONTROL_NONCRITICAL;
2811
2812         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
2813
2814         return LDAP_SUCCESS;
2815 }
2816
2817 /* This overlay is set up for dynamic loading via moduleload. For static
2818  * configuration, you'll need to arrange for the slap_overinst to be
2819  * initialized and registered by some other function inside slapd.
2820  */
2821
2822 static slap_overinst            syncprov;
2823
2824 int
2825 syncprov_initialize()
2826 {
2827         int rc;
2828
2829         rc = register_supported_control( LDAP_CONTROL_SYNC,
2830                 SLAP_CTRL_SEARCH, NULL,
2831                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
2832         if ( rc != LDAP_SUCCESS ) {
2833                 Debug( LDAP_DEBUG_ANY,
2834                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
2835                 return rc;
2836         }
2837
2838         syncprov.on_bi.bi_type = "syncprov";
2839         syncprov.on_bi.bi_db_init = syncprov_db_init;
2840         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
2841         syncprov.on_bi.bi_db_open = syncprov_db_open;
2842         syncprov.on_bi.bi_db_close = syncprov_db_close;
2843
2844         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
2845         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
2846
2847         syncprov.on_bi.bi_op_add = syncprov_op_mod;
2848         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
2849         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
2850         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
2851         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
2852         syncprov.on_bi.bi_op_search = syncprov_op_search;
2853         syncprov.on_bi.bi_extended = syncprov_op_extended;
2854         syncprov.on_bi.bi_operational = syncprov_operational;
2855
2856         syncprov.on_bi.bi_cf_ocs = spocs;
2857
2858         generic_filter.f_desc = slap_schema.si_ad_objectClass;
2859
2860         rc = config_register_schema( spcfg, spocs );
2861         if ( rc ) return rc;
2862
2863         return overlay_register( &syncprov );
2864 }
2865
2866 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
2867 int
2868 init_module( int argc, char *argv[] )
2869 {
2870         return syncprov_initialize();
2871 }
2872 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
2873
2874 #endif /* defined(SLAPD_OVER_SYNCPROV) */