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