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 2004-2011 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 #ifdef LDAP_DEVEL
  32 #define CHECK_CSN       1
  33 #endif
  34
  35 /* A modify request on a particular entry */
  36 typedef struct modinst {
  37         struct modinst *mi_next;
  38         Operation *mi_op;
  39 } modinst;
  40
  41 typedef struct modtarget {
  42         struct modinst *mt_mods;
  43         struct modinst *mt_tail;
  44         Operation *mt_op;
  45         ldap_pvt_thread_mutex_t mt_mutex;
  46 } modtarget;
  47
  48 /* A queued result of a persistent search */
  49 typedef struct syncres {
  50         struct syncres *s_next;
  51         Entry *s_e;
  52         struct berval s_dn;
  53         struct berval s_ndn;
  54         struct berval s_uuid;
  55         struct berval s_csn;
  56         char s_mode;
  57         char s_isreference;
  58 } syncres;
  59
  60 /* Record of a persistent search */
  61 typedef struct syncops {
  62         struct syncops *s_next;
  63         struct berval   s_base;         /* ndn of search base */
  64         ID              s_eid;          /* entryID of search base */
  65         Operation       *s_op;          /* search op */
  66         int             s_rid;
  67         int             s_sid;
  68         struct berval s_filterstr;
  69         int             s_flags;        /* search status */
  70 #define PS_IS_REFRESHING        0x01
  71 #define PS_IS_DETACHED          0x02
  72 #define PS_WROTE_BASE           0x04
  73 #define PS_FIND_BASE            0x08
  74 #define PS_FIX_FILTER           0x10
  75 #define PS_TASK_QUEUED          0x20
  76
  77         int             s_inuse;        /* reference count */
  78         struct syncres *s_res;
  79         struct syncres *s_restail;
  80         ldap_pvt_thread_mutex_t s_mutex;
  81 } syncops;
  82
  83 /* A received sync control */
  84 typedef struct sync_control {
  85         struct sync_cookie sr_state;
  86         int sr_rhint;
  87 } sync_control;
  88
  89 #if 0 /* moved back to slap.h */
  90 #define o_sync  o_ctrlflag[slap_cids.sc_LDAPsync]
  91 #endif
  92 /* o_sync_mode uses data bits of o_sync */
  93 #define o_sync_mode     o_ctrlflag[slap_cids.sc_LDAPsync]
  94
  95 #define SLAP_SYNC_NONE                                  (LDAP_SYNC_NONE<<SLAP_CONTROL_SHIFT)
  96 #define SLAP_SYNC_REFRESH                               (LDAP_SYNC_REFRESH_ONLY<<SLAP_CONTROL_SHIFT)
  97 #define SLAP_SYNC_PERSIST                               (LDAP_SYNC_RESERVED<<SLAP_CONTROL_SHIFT)
  98 #define SLAP_SYNC_REFRESH_AND_PERSIST   (LDAP_SYNC_REFRESH_AND_PERSIST<<SLAP_CONTROL_SHIFT)
  99
 100 /* Record of which searches matched at premodify step */
 101 typedef struct syncmatches {
 102         struct syncmatches *sm_next;
 103         syncops *sm_op;
 104 } syncmatches;
 105
 106 /* Session log data */
 107 typedef struct slog_entry {
 108         struct slog_entry *se_next;
 109         struct berval se_uuid;
 110         struct berval se_csn;
 111         int     se_sid;
 112         ber_tag_t       se_tag;
 113 } slog_entry;
 114
 115 typedef struct sessionlog {
 116         BerVarray       sl_mincsn;
 117         int             *sl_sids;
 118         int             sl_numcsns;
 119         int             sl_num;
 120         int             sl_size;
 121         slog_entry *sl_head;
 122         slog_entry *sl_tail;
 123         ldap_pvt_thread_mutex_t sl_mutex;
 124 } sessionlog;
 125
 126 /* The main state for this overlay */
 127 typedef struct syncprov_info_t {
 128         syncops         *si_ops;
 129         struct berval   si_contextdn;
 130         BerVarray       si_ctxcsn;      /* ldapsync context */
 131         int             *si_sids;
 132         int             si_numcsns;
 133         int             si_chkops;      /* checkpointing info */
 134         int             si_chktime;
 135         int             si_numops;      /* number of ops since last checkpoint */
 136         int             si_nopres;      /* Skip present phase */
 137         int             si_usehint;     /* use reload hint */
 138         int             si_active;      /* True if there are active mods */
 139         int             si_dirty;       /* True if the context is dirty, i.e changes
 140                                                  * have been made without updating the csn. */
 141         time_t  si_chklast;     /* time of last checkpoint */
 142         Avlnode *si_mods;       /* entries being modified */
 143         sessionlog      *si_logs;
 144         ldap_pvt_thread_rdwr_t  si_csn_rwlock;
 145         ldap_pvt_thread_mutex_t si_ops_mutex;
 146         ldap_pvt_thread_mutex_t si_mods_mutex;
 147         ldap_pvt_thread_mutex_t si_resp_mutex;
 148 } syncprov_info_t;
 149
 150 typedef struct opcookie {
 151         slap_overinst *son;
 152         syncmatches *smatches;
 153         modtarget *smt;
 154         Entry *se;
 155         struct berval sdn;      /* DN of entry, for deletes */
 156         struct berval sndn;
 157         struct berval suuid;    /* UUID of entry */
 158         struct berval sctxcsn;
 159         short osid;     /* sid of op csn */
 160         short rsid;     /* sid of relay */
 161         short sreference;       /* Is the entry a reference? */
 162 } opcookie;
 163
 164 typedef struct mutexint {
 165         ldap_pvt_thread_mutex_t mi_mutex;
 166         int mi_int;
 167 } mutexint;
 168
 169 typedef struct fbase_cookie {
 170         struct berval *fdn;     /* DN of a modified entry, for scope testing */
 171         syncops *fss;   /* persistent search we're testing against */
 172         int fbase;      /* if TRUE we found the search base and it's still valid */
 173         int fscope;     /* if TRUE then fdn is within the psearch scope */
 174 } fbase_cookie;
 175
 176 static AttributeName csn_anlist[3];
 177 static AttributeName uuid_anlist[2];
 178
 179 /* Build a LDAPsync intermediate state control */
 180 static int
 181 syncprov_state_ctrl(
 182         Operation       *op,
 183         SlapReply       *rs,
 184         Entry           *e,
 185         int             entry_sync_state,
 186         LDAPControl     **ctrls,
 187         int             num_ctrls,
 188         int             send_cookie,
 189         struct berval   *cookie )
 190 {
 191         Attribute* a;
 192         int ret;
 193
 194         BerElementBuffer berbuf;
 195         BerElement *ber = (BerElement *)&berbuf;
 196
 197         struct berval   entryuuid_bv = BER_BVNULL;
 198
 199         ber_init2( ber, 0, LBER_USE_DER );
 200         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 201
 202         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 203
 204         for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
 205                 AttributeDescription *desc = a->a_desc;
 206                 if ( desc == slap_schema.si_ad_entryUUID ) {
 207                         entryuuid_bv = a->a_nvals[0];
 208                         break;
 209                 }
 210         }
 211
 212         /* FIXME: what if entryuuid is NULL or empty ? */
 213
 214         if ( send_cookie && cookie ) {
 215                 ber_printf( ber, "{eOON}",
 216                         entry_sync_state, &entryuuid_bv, cookie );
 217         } else {
 218                 ber_printf( ber, "{eON}",
 219                         entry_sync_state, &entryuuid_bv );
 220         }
 221
 222         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_STATE;
 223         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 224         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 225
 226         ber_free_buf( ber );
 227
 228         if ( ret < 0 ) {
 229                 Debug( LDAP_DEBUG_TRACE,
 230                         "slap_build_sync_ctrl: ber_flatten2 failed (%d)\n",
 231                         ret, 0, 0 );
 232                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 233                 return LDAP_OTHER;
 234         }
 235
 236         return LDAP_SUCCESS;
 237 }
 238
 239 /* Build a LDAPsync final state control */
 240 static int
 241 syncprov_done_ctrl(
 242         Operation       *op,
 243         SlapReply       *rs,
 244         LDAPControl     **ctrls,
 245         int                     num_ctrls,
 246         int                     send_cookie,
 247         struct berval *cookie,
 248         int                     refreshDeletes )
 249 {
 250         int ret;
 251         BerElementBuffer berbuf;
 252         BerElement *ber = (BerElement *)&berbuf;
 253
 254         ber_init2( ber, NULL, LBER_USE_DER );
 255         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 256
 257         ctrls[num_ctrls] = op->o_tmpalloc( sizeof ( LDAPControl ), op->o_tmpmemctx );
 258
 259         ber_printf( ber, "{" );
 260         if ( send_cookie && cookie ) {
 261                 ber_printf( ber, "O", cookie );
 262         }
 263         if ( refreshDeletes == LDAP_SYNC_REFRESH_DELETES ) {
 264                 ber_printf( ber, "b", refreshDeletes );
 265         }
 266         ber_printf( ber, "N}" );
 267
 268         ctrls[num_ctrls]->ldctl_oid = LDAP_CONTROL_SYNC_DONE;
 269         ctrls[num_ctrls]->ldctl_iscritical = (op->o_sync == SLAP_CONTROL_CRITICAL);
 270         ret = ber_flatten2( ber, &ctrls[num_ctrls]->ldctl_value, 1 );
 271
 272         ber_free_buf( ber );
 273
 274         if ( ret < 0 ) {
 275                 Debug( LDAP_DEBUG_TRACE,
 276                         "syncprov_done_ctrl: ber_flatten2 failed (%d)\n",
 277                         ret, 0, 0 );
 278                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 279                 return LDAP_OTHER;
 280         }
 281
 282         return LDAP_SUCCESS;
 283 }
 284
 285 static int
 286 syncprov_sendinfo(
 287         Operation       *op,
 288         SlapReply       *rs,
 289         int                     type,
 290         struct berval *cookie,
 291         int                     refreshDone,
 292         BerVarray       syncUUIDs,
 293         int                     refreshDeletes )
 294 {
 295         BerElementBuffer berbuf;
 296         BerElement *ber = (BerElement *)&berbuf;
 297         struct berval rspdata;
 298
 299         int ret;
 300
 301         ber_init2( ber, NULL, LBER_USE_DER );
 302         ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );
 303
 304         if ( type ) {
 305                 switch ( type ) {
 306                 case LDAP_TAG_SYNC_NEW_COOKIE:
 307                         ber_printf( ber, "tO", type, cookie );
 308                         break;
 309                 case LDAP_TAG_SYNC_REFRESH_DELETE:
 310                 case LDAP_TAG_SYNC_REFRESH_PRESENT:
 311                         ber_printf( ber, "t{", type );
 312                         if ( cookie ) {
 313                                 ber_printf( ber, "O", cookie );
 314                         }
 315                         if ( refreshDone == 0 ) {
 316                                 ber_printf( ber, "b", refreshDone );
 317                         }
 318                         ber_printf( ber, "N}" );
 319                         break;
 320                 case LDAP_TAG_SYNC_ID_SET:
 321                         ber_printf( ber, "t{", type );
 322                         if ( cookie ) {
 323                                 ber_printf( ber, "O", cookie );
 324                         }
 325                         if ( refreshDeletes == 1 ) {
 326                                 ber_printf( ber, "b", refreshDeletes );
 327                         }
 328                         ber_printf( ber, "[W]", syncUUIDs );
 329                         ber_printf( ber, "N}" );
 330                         break;
 331                 default:
 332                         Debug( LDAP_DEBUG_TRACE,
 333                                 "syncprov_sendinfo: invalid syncinfo type (%d)\n",
 334                                 type, 0, 0 );
 335                         return LDAP_OTHER;
 336                 }
 337         }
 338
 339         ret = ber_flatten2( ber, &rspdata, 0 );
 340
 341         if ( ret < 0 ) {
 342                 Debug( LDAP_DEBUG_TRACE,
 343                         "syncprov_sendinfo: ber_flatten2 failed (%d)\n",
 344                         ret, 0, 0 );
 345                 send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
 346                 return LDAP_OTHER;
 347         }
 348
 349         rs->sr_rspoid = LDAP_SYNC_INFO;
 350         rs->sr_rspdata = &rspdata;
 351         send_ldap_intermediate( op, rs );
 352         rs->sr_rspdata = NULL;
 353         ber_free_buf( ber );
 354
 355         return LDAP_SUCCESS;
 356 }
 357
 358 /* Find a modtarget in an AVL tree */
 359 static int
 360 sp_avl_cmp( const void *c1, const void *c2 )
 361 {
 362         const modtarget *m1, *m2;
 363         int rc;
 364
 365         m1 = c1; m2 = c2;
 366         rc = m1->mt_op->o_req_ndn.bv_len - m2->mt_op->o_req_ndn.bv_len;
 367
 368         if ( rc ) return rc;
 369         return ber_bvcmp( &m1->mt_op->o_req_ndn, &m2->mt_op->o_req_ndn );
 370 }
 371
 372 /* syncprov_findbase:
 373  *   finds the true DN of the base of a search (with alias dereferencing) and
 374  * checks to make sure the base entry doesn't get replaced with a different
 375  * entry (e.g., swapping trees via ModDN, or retargeting an alias). If a
 376  * change is detected, any persistent search on this base must be terminated /
 377  * reloaded.
 378  *   On the first call, we just save the DN and entryID. On subsequent calls
 379  * we compare the DN and entryID with the saved values.
 380  */
 381 static int
 382 findbase_cb( Operation *op, SlapReply *rs )
 383 {
 384         slap_callback *sc = op->o_callback;
 385
 386         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 387                 fbase_cookie *fc = sc->sc_private;
 388
 389                 /* If no entryID, we're looking for the first time.
 390                  * Just store whatever we got.
 391                  */
 392                 if ( fc->fss->s_eid == NOID ) {
 393                         fc->fbase = 2;
 394                         fc->fss->s_eid = rs->sr_entry->e_id;
 395                         ber_dupbv( &fc->fss->s_base, &rs->sr_entry->e_nname );
 396
 397                 } else if ( rs->sr_entry->e_id == fc->fss->s_eid &&
 398                         dn_match( &rs->sr_entry->e_nname, &fc->fss->s_base )) {
 399
 400                 /* OK, the DN is the same and the entryID is the same. */
 401                         fc->fbase = 1;
 402                 }
 403         }
 404         if ( rs->sr_err != LDAP_SUCCESS ) {
 405                 Debug( LDAP_DEBUG_ANY, "findbase failed! %d\n", rs->sr_err,0,0 );
 406         }
 407         return LDAP_SUCCESS;
 408 }
 409
 410 static Filter generic_filter = { LDAP_FILTER_PRESENT, { 0 }, NULL };
 411 static struct berval generic_filterstr = BER_BVC("(objectclass=*)");
 412
 413 static int
 414 syncprov_findbase( Operation *op, fbase_cookie *fc )
 415 {
 416         /* Use basic parameters from syncrepl search, but use
 417          * current op's threadctx / tmpmemctx
 418          */
 419         ldap_pvt_thread_mutex_lock( &fc->fss->s_mutex );
 420         if ( fc->fss->s_flags & PS_FIND_BASE ) {
 421                 slap_callback cb = {0};
 422                 Operation fop;
 423                 SlapReply frs = { REP_RESULT };
 424                 int rc;
 425
 426                 fc->fss->s_flags ^= PS_FIND_BASE;
 427                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 428
 429                 fop = *fc->fss->s_op;
 430
 431                 fop.o_bd = fop.o_bd->bd_self;
 432                 fop.o_hdr = op->o_hdr;
 433                 fop.o_time = op->o_time;
 434                 fop.o_tincr = op->o_tincr;
 435
 436                 cb.sc_response = findbase_cb;
 437                 cb.sc_private = fc;
 438
 439                 fop.o_sync_mode = 0;    /* turn off sync mode */
 440                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 441                 fop.o_callback = &cb;
 442                 fop.o_tag = LDAP_REQ_SEARCH;
 443                 fop.ors_scope = LDAP_SCOPE_BASE;
 444                 fop.ors_limit = NULL;
 445                 fop.ors_slimit = 1;
 446                 fop.ors_tlimit = SLAP_NO_LIMIT;
 447                 fop.ors_attrs = slap_anlist_no_attrs;
 448                 fop.ors_attrsonly = 1;
 449                 fop.ors_filter = &generic_filter;
 450                 fop.ors_filterstr = generic_filterstr;
 451
 452                 rc = fop.o_bd->be_search( &fop, &frs );
 453         } else {
 454                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 455                 fc->fbase = 1;
 456         }
 457
 458         /* After the first call, see if the fdn resides in the scope */
 459         if ( fc->fbase == 1 ) {
 460                 switch ( fc->fss->s_op->ors_scope ) {
 461                 case LDAP_SCOPE_BASE:
 462                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 463                         break;
 464                 case LDAP_SCOPE_ONELEVEL: {
 465                         struct berval pdn;
 466                         dnParent( fc->fdn, &pdn );
 467                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 468                         break; }
 469                 case LDAP_SCOPE_SUBTREE:
 470                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 471                         break;
 472                 case LDAP_SCOPE_SUBORDINATE:
 473                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 474                                 !dn_match( fc->fdn, &fc->fss->s_base );
 475                         break;
 476                 }
 477         }
 478
 479         if ( fc->fbase )
 480                 return LDAP_SUCCESS;
 481
 482         /* If entryID has changed, then the base of this search has
 483          * changed. Invalidate the psearch.
 484          */
 485         return LDAP_NO_SUCH_OBJECT;
 486 }
 487
 488 /* syncprov_findcsn:
 489  *   This function has three different purposes, but they all use a search
 490  * that filters on entryCSN so they're combined here.
 491  * 1: at startup time, after a contextCSN has been read from the database,
 492  * we search for all entries with CSN >= contextCSN in case the contextCSN
 493  * was not checkpointed at the previous shutdown.
 494  *
 495  * 2: when the current contextCSN is known and we have a sync cookie, we search
 496  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 497  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 498  *
 499  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 500  * CSN, and generate Present records for them. We always collect this result
 501  * in SyncID sets, even if there's only one match.
 502  */
 503 typedef enum find_csn_t {
 504         FIND_MAXCSN     = 1,
 505         FIND_CSN        = 2,
 506         FIND_PRESENT    = 3
 507 } find_csn_t;
 508
 509 static int
 510 findmax_cb( Operation *op, SlapReply *rs )
 511 {
 512         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 513                 struct berval *maxcsn = op->o_callback->sc_private;
 514                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 515                         slap_schema.si_ad_entryCSN );
 516
 517                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 518                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 519                         maxcsn->bv_len = a->a_vals[0].bv_len;
 520                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 521                 }
 522         }
 523         return LDAP_SUCCESS;
 524 }
 525
 526 static int
 527 findcsn_cb( Operation *op, SlapReply *rs )
 528 {
 529         slap_callback *sc = op->o_callback;
 530
 531         /* We just want to know that at least one exists, so it's OK if
 532          * we exceed the unchecked limit.
 533          */
 534         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 535                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 536                 sc->sc_private = (void *)1;
 537         }
 538         return LDAP_SUCCESS;
 539 }
 540
 541 /* Build a list of entryUUIDs for sending in a SyncID set */
 542
 543 #define UUID_LEN        16
 544
 545 typedef struct fpres_cookie {
 546         int num;
 547         BerVarray uuids;
 548         char *last;
 549 } fpres_cookie;
 550
 551 static int
 552 findpres_cb( Operation *op, SlapReply *rs )
 553 {
 554         slap_callback *sc = op->o_callback;
 555         fpres_cookie *pc = sc->sc_private;
 556         Attribute *a;
 557         int ret = SLAP_CB_CONTINUE;
 558
 559         switch ( rs->sr_type ) {
 560         case REP_SEARCH:
 561                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 562                 if ( a ) {
 563                         pc->uuids[pc->num].bv_val = pc->last;
 564                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 565                                 pc->uuids[pc->num].bv_len );
 566                         pc->num++;
 567                         pc->last = pc->uuids[pc->num].bv_val;
 568                         pc->uuids[pc->num].bv_val = NULL;
 569                 }
 570                 ret = LDAP_SUCCESS;
 571                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 572                         break;
 573                 /* FALLTHRU */
 574         case REP_RESULT:
 575                 ret = rs->sr_err;
 576                 if ( pc->num ) {
 577                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 578                                 0, pc->uuids, 0 );
 579                         pc->uuids[pc->num].bv_val = pc->last;
 580                         pc->num = 0;
 581                         pc->last = pc->uuids[0].bv_val;
 582                 }
 583                 break;
 584         default:
 585                 break;
 586         }
 587         return ret;
 588 }
 589
 590 static int
 591 syncprov_findcsn( Operation *op, find_csn_t mode, struct berval *csn )
 592 {
 593         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 594         syncprov_info_t         *si = on->on_bi.bi_private;
 595
 596         slap_callback cb = {0};
 597         Operation fop;
 598         SlapReply frs = { REP_RESULT };
 599         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 600         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 601         struct berval maxcsn;
 602         Filter cf;
 603         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 604         fpres_cookie pcookie;
 605         sync_control *srs = NULL;
 606         struct slap_limits_set fc_limits;
 607         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 608         int maxid;
 609
 610         if ( mode != FIND_MAXCSN ) {
 611                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 612         }
 613
 614         fop = *op;
 615         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 616         /* We want pure entries, not referrals */
 617         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 618
 619         cf.f_ava = &eq;
 620         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 621         BER_BVZERO( &cf.f_av_value );
 622         cf.f_next = NULL;
 623
 624         fop.o_callback = &cb;
 625         fop.ors_limit = NULL;
 626         fop.ors_tlimit = SLAP_NO_LIMIT;
 627         fop.ors_filter = &cf;
 628         fop.ors_filterstr.bv_val = buf;
 629
 630 again:
 631         switch( mode ) {
 632         case FIND_MAXCSN:
 633                 cf.f_choice = LDAP_FILTER_GE;
 634                 /* If there are multiple CSNs, use the one with our serverID */
 635                 for ( i=0; i<si->si_numcsns; i++) {
 636                         if ( slap_serverID == si->si_sids[i] ) {
 637                                 maxid = i;
 638                                 break;
 639                         }
 640                 }
 641                 if ( i == si->si_numcsns ) {
 642                         /* No match: this is multimaster, and none of the content in the DB
 643                          * originated locally. Treat like no CSN.
 644                          */
 645                         return LDAP_NO_SUCH_OBJECT;
 646                 }
 647                 cf.f_av_value = si->si_ctxcsn[maxid];
 648                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 649                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 650                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 651                         return LDAP_OTHER;
 652                 }
 653                 fop.ors_attrsonly = 0;
 654                 fop.ors_attrs = csn_anlist;
 655                 fop.ors_slimit = SLAP_NO_LIMIT;
 656                 cb.sc_private = &maxcsn;
 657                 cb.sc_response = findmax_cb;
 658                 strcpy( cbuf, cf.f_av_value.bv_val );
 659                 maxcsn.bv_val = cbuf;
 660                 maxcsn.bv_len = cf.f_av_value.bv_len;
 661                 break;
 662         case FIND_CSN:
 663                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 664                         cf.f_av_value = *csn;
 665                 }
 666                 fop.o_dn = op->o_bd->be_rootdn;
 667                 fop.o_ndn = op->o_bd->be_rootndn;
 668                 fop.o_req_dn = op->o_bd->be_suffix[0];
 669                 fop.o_req_ndn = op->o_bd->be_nsuffix[0];
 670                 /* Look for exact match the first time */
 671                 if ( findcsn_retry ) {
 672                         cf.f_choice = LDAP_FILTER_EQUALITY;
 673                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 674                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 675                 /* On retry, look for <= */
 676                 } else {
 677                         cf.f_choice = LDAP_FILTER_LE;
 678                         fop.ors_limit = &fc_limits;
 679                         memset( &fc_limits, 0, sizeof( fc_limits ));
 680                         fc_limits.lms_s_unchecked = 1;
 681                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 682                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 683                 }
 684                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 685                         return LDAP_OTHER;
 686                 }
 687                 fop.ors_attrsonly = 1;
 688                 fop.ors_attrs = slap_anlist_no_attrs;
 689                 fop.ors_slimit = 1;
 690                 cb.sc_private = NULL;
 691                 cb.sc_response = findcsn_cb;
 692                 break;
 693         case FIND_PRESENT:
 694                 fop.ors_filter = op->ors_filter;
 695                 fop.ors_filterstr = op->ors_filterstr;
 696                 fop.ors_attrsonly = 0;
 697                 fop.ors_attrs = uuid_anlist;
 698                 fop.ors_slimit = SLAP_NO_LIMIT;
 699                 cb.sc_private = &pcookie;
 700                 cb.sc_response = findpres_cb;
 701                 pcookie.num = 0;
 702
 703                 /* preallocate storage for a full set */
 704                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 705                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 706                         op->o_tmpmemctx );
 707                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 708                 pcookie.uuids[0].bv_val = pcookie.last;
 709                 pcookie.uuids[0].bv_len = UUID_LEN;
 710                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 711                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 712                         pcookie.uuids[i].bv_len = UUID_LEN;
 713                 }
 714                 break;
 715         }
 716
 717         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 718         fop.o_bd->be_search( &fop, &frs );
 719         fop.o_bd->bd_info = (BackendInfo *)on;
 720
 721         switch( mode ) {
 722         case FIND_MAXCSN:
 723                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 724 #ifdef CHECK_CSN
 725                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 726                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 727 #endif
 728                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 729                         si->si_numops++;        /* ensure a checkpoint */
 730                 }
 731                 break;
 732         case FIND_CSN:
 733                 /* If matching CSN was not found, invalidate the context. */
 734                 if ( !cb.sc_private ) {
 735                         /* If we didn't find an exact match, then try for <= */
 736                         if ( findcsn_retry ) {
 737                                 findcsn_retry = 0;
 738                                 rs_reinit( &frs, REP_RESULT );
 739                                 goto again;
 740                         }
 741                         rc = LDAP_NO_SUCH_OBJECT;
 742                 }
 743                 break;
 744         case FIND_PRESENT:
 745                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 746                 break;
 747         }
 748
 749         return rc;
 750 }
 751
 752 /* Should find a place to cache these */
 753 static mutexint *get_mutexint()
 754 {
 755         mutexint *mi = ch_malloc( sizeof( mutexint ));
 756         ldap_pvt_thread_mutex_init( &mi->mi_mutex );
 757         mi->mi_int = 1;
 758         return mi;
 759 }
 760
 761 static void inc_mutexint( mutexint *mi )
 762 {
 763         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 764         mi->mi_int++;
 765         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 766 }
 767
 768 /* return resulting counter */
 769 static int dec_mutexint( mutexint *mi )
 770 {
 771         int i;
 772         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 773         i = --mi->mi_int;
 774         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 775         if ( !i ) {
 776                 ldap_pvt_thread_mutex_destroy( &mi->mi_mutex );
 777                 ch_free( mi );
 778         }
 779         return i;
 780 }
 781
 782 static void
 783 syncprov_free_syncop( syncops *so )
 784 {
 785         syncres *sr, *srnext;
 786         GroupAssertion *ga, *gnext;
 787
 788         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 789         /* already being freed, or still in use */
 790         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 791                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 792                 return;
 793         }
 794         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 795         if ( so->s_flags & PS_IS_DETACHED ) {
 796                 filter_free( so->s_op->ors_filter );
 797                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 798                         gnext = ga->ga_next;
 799                         ch_free( ga );
 800                 }
 801                 ch_free( so->s_op );
 802         }
 803         ch_free( so->s_base.bv_val );
 804         for ( sr=so->s_res; sr; sr=srnext ) {
 805                 srnext = sr->s_next;
 806                 if ( sr->s_e ) {
 807                         if ( !dec_mutexint( sr->s_e->e_private )) {
 808                                 sr->s_e->e_private = NULL;
 809                                 entry_free( sr->s_e );
 810                         }
 811                 }
 812                 ch_free( sr );
 813         }
 814         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 815         ch_free( so );
 816 }
 817
 818 /* Send a persistent search response */
 819 static int
 820 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, int mode )
 821 {
 822         SlapReply rs = { REP_SEARCH };
 823         LDAPControl *ctrls[2];
 824         struct berval cookie = BER_BVNULL, csns[2];
 825         Entry e_uuid = {0};
 826         Attribute a_uuid = {0};
 827
 828         if ( so->s_op->o_abandon )
 829                 return SLAPD_ABANDON;
 830
 831         ctrls[1] = NULL;
 832         if ( !BER_BVISNULL( &opc->sctxcsn )) {
 833                 csns[0] = opc->sctxcsn;
 834                 BER_BVZERO( &csns[1] );
 835                 slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 836         }
 837
 838 #ifdef LDAP_DEBUG
 839         if ( so->s_sid > 0 ) {
 840                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 841                         so->s_sid, cookie.bv_val ? cookie.bv_val : "", 0 );
 842         } else {
 843                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 844                         cookie.bv_val ? cookie.bv_val : "", 0, 0 );
 845         }
 846 #endif
 847
 848         e_uuid.e_attrs = &a_uuid;
 849         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 850         a_uuid.a_nvals = &opc->suuid;
 851         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 852                 mode, ctrls, 0, 1, &cookie );
 853         if ( !BER_BVISNULL( &cookie )) {
 854                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 855         }
 856
 857         rs.sr_ctrls = ctrls;
 858         rs.sr_entry = &e_uuid;
 859         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 860                 e_uuid = *opc->se;
 861                 e_uuid.e_private = NULL;
 862         }
 863
 864         switch( mode ) {
 865         case LDAP_SYNC_ADD:
 866                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 867                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 868                         rs.sr_err = send_search_reference( op, &rs );
 869                         ber_bvarray_free( rs.sr_ref );
 870                         break;
 871                 }
 872                 /* fallthru */
 873         case LDAP_SYNC_MODIFY:
 874                 rs.sr_attrs = op->ors_attrs;
 875                 rs.sr_err = send_search_entry( op, &rs );
 876                 break;
 877         case LDAP_SYNC_DELETE:
 878                 e_uuid.e_attrs = NULL;
 879                 e_uuid.e_name = opc->sdn;
 880                 e_uuid.e_nname = opc->sndn;
 881                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 882                         struct berval bv = BER_BVNULL;
 883                         rs.sr_ref = &bv;
 884                         rs.sr_err = send_search_reference( op, &rs );
 885                 } else {
 886                         rs.sr_err = send_search_entry( op, &rs );
 887                 }
 888                 break;
 889         default:
 890                 assert(0);
 891         }
 892         /* In case someone else freed it already? */
 893         if ( rs.sr_ctrls ) {
 894                 int i;
 895                 for ( i=0; rs.sr_ctrls[i]; i++ ) {
 896                         if ( rs.sr_ctrls[i] == ctrls[0] ) {
 897                                 op->o_tmpfree( ctrls[0]->ldctl_value.bv_val, op->o_tmpmemctx );
 898                                 ctrls[0]->ldctl_value.bv_val = NULL;
 899                                 break;
 900                         }
 901                 }
 902                 rs.sr_ctrls = NULL;
 903         }
 904
 905         return rs.sr_err;
 906 }
 907
 908 static void
 909 syncprov_qstart( syncops *so );
 910
 911 /* Play back queued responses */
 912 static int
 913 syncprov_qplay( Operation *op, syncops *so )
 914 {
 915         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 916         syncres *sr;
 917         opcookie opc;
 918         int rc = 0;
 919
 920         opc.son = on;
 921
 922         do {
 923                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 924                 sr = so->s_res;
 925                 if ( sr )
 926                         so->s_res = sr->s_next;
 927                 if ( !so->s_res )
 928                         so->s_restail = NULL;
 929                 /* Exit loop with mutex held */
 930                 if ( !sr || so->s_op->o_abandon )
 931                         break;
 932                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 933
 934                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 935                         SlapReply rs = { REP_INTERMEDIATE };
 936
 937                         rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 938                                 &sr->s_csn, 0, NULL, 0 );
 939                 } else {
 940                         opc.sdn = sr->s_dn;
 941                         opc.sndn = sr->s_ndn;
 942                         opc.suuid = sr->s_uuid;
 943                         opc.sctxcsn = sr->s_csn;
 944                         opc.sreference = sr->s_isreference;
 945                         opc.se = sr->s_e;
 946
 947                         rc = syncprov_sendresp( op, &opc, so, sr->s_mode );
 948
 949                 }
 950                 if ( sr->s_e ) {
 951                         if ( !dec_mutexint( sr->s_e->e_private )) {
 952                                 sr->s_e->e_private = NULL;
 953                                 entry_free ( sr->s_e );
 954                         }
 955                 }
 956
 957                 ch_free( sr );
 958
 959                 /* Exit loop with mutex held */
 960                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 961
 962         } while (0);
 963
 964         /* We now only send one change at a time, to prevent one
 965          * psearch from hogging all the CPU. Resubmit this task if
 966          * there are more responses queued and no errors occurred.
 967          */
 968
 969         if ( rc == 0 && so->s_res ) {
 970                 syncprov_qstart( so );
 971         } else {
 972                 so->s_flags ^= PS_TASK_QUEUED;
 973         }
 974
 975         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 976         return rc;
 977 }
 978
 979 /* task for playing back queued responses */
 980 static void *
 981 syncprov_qtask( void *ctx, void *arg )
 982 {
 983         syncops *so = arg;
 984         OperationBuffer opbuf;
 985         Operation *op;
 986         BackendDB be;
 987         int rc;
 988
 989         op = &opbuf.ob_op;
 990         *op = *so->s_op;
 991         op->o_hdr = &opbuf.ob_hdr;
 992         op->o_controls = opbuf.ob_controls;
 993         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 994         op->o_sync = SLAP_CONTROL_IGNORED;
 995
 996         *op->o_hdr = *so->s_op->o_hdr;
 997
 998         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 999         op->o_tmpmfuncs = &slap_sl_mfuncs;
1000         op->o_threadctx = ctx;
1001
1002         /* syncprov_qplay expects a fake db */
1003         be = *so->s_op->o_bd;
1004         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1005         op->o_bd = &be;
1006         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1007         op->o_callback = NULL;
1008
1009         rc = syncprov_qplay( op, so );
1010
1011         /* decrement use count... */
1012         syncprov_free_syncop( so );
1013
1014         return NULL;
1015 }
1016
1017 /* Start the task to play back queued psearch responses */
1018 static void
1019 syncprov_qstart( syncops *so )
1020 {
1021         so->s_flags |= PS_TASK_QUEUED;
1022         so->s_inuse++;
1023         ldap_pvt_thread_pool_submit( &connection_pool,
1024                 syncprov_qtask, so );
1025 }
1026
1027 /* Queue a persistent search response */
1028 static int
1029 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1030 {
1031         syncres *sr;
1032         int srsize;
1033         struct berval cookie = opc->sctxcsn;
1034
1035         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1036                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1037
1038                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1039                         so->s_rid, slap_serverID ? slap_serverID : -1);
1040         }
1041
1042         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1043                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1044         if ( cookie.bv_len )
1045                 srsize += cookie.bv_len + 1;
1046         sr = ch_malloc( srsize );
1047         sr->s_next = NULL;
1048         sr->s_e = opc->se;
1049         /* bump refcount on this entry */
1050         if ( opc->se )
1051                 inc_mutexint( opc->se->e_private );
1052         sr->s_dn.bv_val = (char *)(sr + 1);
1053         sr->s_dn.bv_len = opc->sdn.bv_len;
1054         sr->s_mode = mode;
1055         sr->s_isreference = opc->sreference;
1056         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1057                  opc->sdn.bv_val ) + 1;
1058         sr->s_ndn.bv_len = opc->sndn.bv_len;
1059         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1060                  opc->sndn.bv_val ) + 1;
1061         sr->s_uuid.bv_len = opc->suuid.bv_len;
1062         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1063         if ( cookie.bv_len ) {
1064                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1065                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1066         } else {
1067                 sr->s_csn.bv_val = NULL;
1068         }
1069         sr->s_csn.bv_len = cookie.bv_len;
1070
1071         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1072                 ch_free( cookie.bv_val );
1073         }
1074
1075         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1076         if ( !so->s_res ) {
1077                 so->s_res = sr;
1078         } else {
1079                 so->s_restail->s_next = sr;
1080         }
1081         so->s_restail = sr;
1082
1083         /* If the base of the psearch was modified, check it next time round */
1084         if ( so->s_flags & PS_WROTE_BASE ) {
1085                 so->s_flags ^= PS_WROTE_BASE;
1086                 so->s_flags |= PS_FIND_BASE;
1087         }
1088         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1089                 syncprov_qstart( so );
1090         }
1091         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1092         return LDAP_SUCCESS;
1093 }
1094
1095 static int
1096 syncprov_drop_psearch( syncops *so, int lock )
1097 {
1098         if ( so->s_flags & PS_IS_DETACHED ) {
1099                 if ( lock )
1100                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1101                 so->s_op->o_conn->c_n_ops_executing--;
1102                 so->s_op->o_conn->c_n_ops_completed++;
1103                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1104                         o_next );
1105                 if ( lock )
1106                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1107         }
1108         syncprov_free_syncop( so );
1109
1110         return 0;
1111 }
1112
1113 static int
1114 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1115 {
1116         slap_callback *sc = op->o_callback;
1117         op->o_callback = sc->sc_next;
1118         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1119         op->o_tmpfree( sc, op->o_tmpmemctx );
1120         return 0;
1121 }
1122
1123 static int
1124 syncprov_op_abandon( Operation *op, SlapReply *rs )
1125 {
1126         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1127         syncprov_info_t         *si = on->on_bi.bi_private;
1128         syncops *so, *soprev;
1129
1130         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1131         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1132                 soprev=so, so=so->s_next ) {
1133                 if ( so->s_op->o_connid == op->o_connid &&
1134                         so->s_op->o_msgid == op->orn_msgid ) {
1135                                 so->s_op->o_abandon = 1;
1136                                 soprev->s_next = so->s_next;
1137                                 break;
1138                 }
1139         }
1140         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1141         if ( so ) {
1142                 /* Is this really a Cancel exop? */
1143                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1144                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1145                         rs->sr_err = LDAP_CANCELLED;
1146                         send_ldap_result( so->s_op, rs );
1147                         if ( so->s_flags & PS_IS_DETACHED ) {
1148                                 slap_callback *cb;
1149                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1150                                 cb->sc_cleanup = syncprov_ab_cleanup;
1151                                 cb->sc_next = op->o_callback;
1152                                 cb->sc_private = so;
1153                                 return SLAP_CB_CONTINUE;
1154                         }
1155                 }
1156                 syncprov_drop_psearch( so, 0 );
1157         }
1158         return SLAP_CB_CONTINUE;
1159 }
1160
1161 /* Find which persistent searches are affected by this operation */
1162 static void
1163 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1164 {
1165         slap_overinst *on = opc->son;
1166         syncprov_info_t         *si = on->on_bi.bi_private;
1167
1168         fbase_cookie fc;
1169         syncops *ss, *sprev, *snext;
1170         Entry *e = NULL;
1171         Attribute *a;
1172         int rc;
1173         struct berval newdn;
1174         int freefdn = 0;
1175         BackendDB *b0 = op->o_bd, db;
1176
1177         fc.fdn = &op->o_req_ndn;
1178         /* compute new DN */
1179         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1180                 struct berval pdn;
1181                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1182                 else dnParent( fc.fdn, &pdn );
1183                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1184                 fc.fdn = &newdn;
1185                 freefdn = 1;
1186         }
1187         if ( op->o_tag != LDAP_REQ_ADD ) {
1188                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1189                         db = *op->o_bd;
1190                         op->o_bd = &db;
1191                 }
1192                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1193                 /* If we're sending responses now, make a copy and unlock the DB */
1194                 if ( e && !saveit ) {
1195                         if ( !opc->se ) {
1196                                 opc->se = entry_dup( e );
1197                                 opc->se->e_private = get_mutexint();
1198                         }
1199                         overlay_entry_release_ov( op, e, 0, on );
1200                         e = opc->se;
1201                 }
1202                 if ( rc ) {
1203                         op->o_bd = b0;
1204                         return;
1205                 }
1206         } else {
1207                 e = op->ora_e;
1208                 if ( !saveit ) {
1209                         if ( !opc->se ) {
1210                                 opc->se = entry_dup( e );
1211                                 opc->se->e_private = get_mutexint();
1212                         }
1213                         e = opc->se;
1214                 }
1215         }
1216
1217         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1218                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1219                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1220                 opc->sreference = is_entry_referral( e );
1221                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1222                 if ( a )
1223                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1224         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1225                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1226                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1227                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1228                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1229         }
1230
1231         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1232         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1233                 sprev = ss, ss=snext)
1234         {
1235                 Operation op2;
1236                 Opheader oh;
1237                 syncmatches *sm;
1238                 int found = 0;
1239
1240                 snext = ss->s_next;
1241                 if ( ss->s_op->o_abandon )
1242                         continue;
1243
1244                 /* Don't send ops back to the originator */
1245                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1246                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1247                                 opc->osid, 0, 0 );
1248                         continue;
1249                 }
1250
1251                 /* Don't send ops back to the messenger */
1252                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1253                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1254                                 opc->rsid, 0, 0 );
1255                         continue;
1256                 }
1257
1258                 /* validate base */
1259                 fc.fss = ss;
1260                 fc.fbase = 0;
1261                 fc.fscope = 0;
1262
1263                 /* If the base of the search is missing, signal a refresh */
1264                 rc = syncprov_findbase( op, &fc );
1265                 if ( rc != LDAP_SUCCESS ) {
1266                         SlapReply rs = {REP_RESULT};
1267                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1268                                 "search base has changed" );
1269                         sprev->s_next = snext;
1270                         syncprov_drop_psearch( ss, 1 );
1271                         ss = sprev;
1272                         continue;
1273                 }
1274
1275                 /* If we're sending results now, look for this op in old matches */
1276                 if ( !saveit ) {
1277                         syncmatches *old;
1278
1279                         /* Did we modify the search base? */
1280                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1281                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1282                                 ss->s_flags |= PS_WROTE_BASE;
1283                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1284                         }
1285
1286                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1287                                 old=sm, sm=sm->sm_next ) {
1288                                 if ( sm->sm_op == ss ) {
1289                                         found = 1;
1290                                         old->sm_next = sm->sm_next;
1291                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1292                                         break;
1293                                 }
1294                         }
1295                 }
1296
1297                 if ( fc.fscope ) {
1298                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1299                         op2 = *ss->s_op;
1300                         oh = *op->o_hdr;
1301                         oh.oh_conn = ss->s_op->o_conn;
1302                         oh.oh_connid = ss->s_op->o_connid;
1303                         op2.o_bd = op->o_bd->bd_self;
1304                         op2.o_hdr = &oh;
1305                         op2.o_extra = op->o_extra;
1306                         op2.o_callback = NULL;
1307                         if (ss->s_flags & PS_FIX_FILTER) {
1308                                 /* Skip the AND/GE clause that we stuck on in front. We
1309                                    would lose deletes/mods that happen during the refresh
1310                                    phase otherwise (ITS#6555) */
1311                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1312                         }
1313                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1314                         rc = test_filter( &op2, e, op2.ors_filter );
1315                 }
1316
1317                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1318                         ss->s_sid, fc.fscope, rc );
1319
1320                 /* check if current o_req_dn is in scope and matches filter */
1321                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1322                         if ( saveit ) {
1323                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1324                                 sm->sm_next = opc->smatches;
1325                                 sm->sm_op = ss;
1326                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1327                                 ++ss->s_inuse;
1328                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1329                                 opc->smatches = sm;
1330                         } else {
1331                                 /* if found send UPDATE else send ADD */
1332                                 syncprov_qresp( opc, ss,
1333                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1334                         }
1335                 } else if ( !saveit && found ) {
1336                         /* send DELETE */
1337                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1338                 } else if ( !saveit ) {
1339                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1340                 }
1341                 if ( !saveit && found ) {
1342                         /* Decrement s_inuse, was incremented when called
1343                          * with saveit == TRUE
1344                          */
1345                         syncprov_free_syncop( ss );
1346                 }
1347         }
1348         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1349
1350         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1351                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1352                         op->o_bd = &db;
1353                 }
1354                 if ( saveit )
1355                         overlay_entry_release_ov( op, e, 0, on );
1356                 op->o_bd = b0;
1357         }
1358         if ( opc->se && !saveit ) {
1359                 if ( !dec_mutexint( opc->se->e_private )) {
1360                         opc->se->e_private = NULL;
1361                         entry_free( opc->se );
1362                         opc->se = NULL;
1363                 }
1364         }
1365         if ( freefdn ) {
1366                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1367         }
1368         op->o_bd = b0;
1369 }
1370
1371 static int
1372 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1373 {
1374         slap_callback *cb = op->o_callback;
1375         opcookie *opc = cb->sc_private;
1376         slap_overinst *on = opc->son;
1377         syncprov_info_t         *si = on->on_bi.bi_private;
1378         syncmatches *sm, *snext;
1379         modtarget *mt;
1380
1381         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1382         if ( si->si_active )
1383                 si->si_active--;
1384         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1385
1386         for (sm = opc->smatches; sm; sm=snext) {
1387                 snext = sm->sm_next;
1388                 syncprov_free_syncop( sm->sm_op );
1389                 op->o_tmpfree( sm, op->o_tmpmemctx );
1390         }
1391
1392         /* Remove op from lock table */
1393         mt = opc->smt;
1394         if ( mt ) {
1395                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1396                 mt->mt_mods = mt->mt_mods->mi_next;
1397                 /* If there are more, promote the next one */
1398                 if ( mt->mt_mods ) {
1399                         mt->mt_op = mt->mt_mods->mi_op;
1400                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1401                 } else {
1402                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1403                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1404                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1405                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1406                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1407                         ch_free( mt );
1408                 }
1409         }
1410         if ( !BER_BVISNULL( &opc->suuid ))
1411                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1412         if ( !BER_BVISNULL( &opc->sndn ))
1413                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1414         if ( !BER_BVISNULL( &opc->sdn ))
1415                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1416         op->o_callback = cb->sc_next;
1417         op->o_tmpfree(cb, op->o_tmpmemctx);
1418
1419         return 0;
1420 }
1421
1422 static void
1423 syncprov_checkpoint( Operation *op, slap_overinst *on )
1424 {
1425         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1426         Modifications mod;
1427         Operation opm;
1428         SlapReply rsm = {REP_RESULT};
1429         slap_callback cb = {0};
1430         BackendDB be;
1431         BackendInfo *bi;
1432
1433 #ifdef CHECK_CSN
1434         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1435
1436         int i;
1437         for ( i=0; i<si->si_numcsns; i++ ) {
1438                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1439         }
1440 #endif
1441         mod.sml_numvals = si->si_numcsns;
1442         mod.sml_values = si->si_ctxcsn;
1443         mod.sml_nvalues = NULL;
1444         mod.sml_desc = slap_schema.si_ad_contextCSN;
1445         mod.sml_op = LDAP_MOD_REPLACE;
1446         mod.sml_flags = SLAP_MOD_INTERNAL;
1447         mod.sml_next = NULL;
1448
1449         cb.sc_response = slap_null_cb;
1450         opm = *op;
1451         opm.o_tag = LDAP_REQ_MODIFY;
1452         opm.o_callback = &cb;
1453         opm.orm_modlist = &mod;
1454         opm.orm_no_opattrs = 1;
1455         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1456                 be = *on->on_info->oi_origdb;
1457                 opm.o_bd = &be;
1458         }
1459         opm.o_req_dn = si->si_contextdn;
1460         opm.o_req_ndn = si->si_contextdn;
1461         bi = opm.o_bd->bd_info;
1462         opm.o_bd->bd_info = on->on_info->oi_orig;
1463         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1464         opm.o_no_schema_check = 1;
1465         opm.o_bd->be_modify( &opm, &rsm );
1466
1467         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1468                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1469                 const char      *text;
1470                 char txtbuf[SLAP_TEXT_BUFLEN];
1471                 size_t textlen = sizeof txtbuf;
1472                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1473                 rs_reinit( &rsm, REP_RESULT );
1474                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1475                 opm.ora_e = e;
1476                 opm.o_bd->be_add( &opm, &rsm );
1477                 if ( e == opm.ora_e )
1478                         be_entry_release_w( &opm, opm.ora_e );
1479         }
1480         opm.o_bd->bd_info = bi;
1481
1482         if ( mod.sml_next != NULL ) {
1483                 slap_mods_free( mod.sml_next, 1 );
1484         }
1485 #ifdef CHECK_CSN
1486         for ( i=0; i<si->si_numcsns; i++ ) {
1487                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1488         }
1489 #endif
1490 }
1491
1492 static void
1493 syncprov_add_slog( Operation *op )
1494 {
1495         opcookie *opc = op->o_callback->sc_private;
1496         slap_overinst *on = opc->son;
1497         syncprov_info_t         *si = on->on_bi.bi_private;
1498         sessionlog *sl;
1499         slog_entry *se;
1500
1501         sl = si->si_logs;
1502         {
1503                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1504                         /* During the syncrepl refresh phase we can receive operations
1505                          * without a csn.  We cannot reliably determine the consumers
1506                          * state with respect to such operations, so we ignore them and
1507                          * wipe out anything in the log if we see them.
1508                          */
1509                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1510                         while ( se = sl->sl_head ) {
1511                                 sl->sl_head = se->se_next;
1512                                 ch_free( se );
1513                         }
1514                         sl->sl_tail = NULL;
1515                         sl->sl_num = 0;
1516                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1517                         return;
1518                 }
1519
1520                 /* Allocate a record. UUIDs are not NUL-terminated. */
1521                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1522                         op->o_csn.bv_len + 1 );
1523                 se->se_next = NULL;
1524                 se->se_tag = op->o_tag;
1525
1526                 se->se_uuid.bv_val = (char *)(&se[1]);
1527                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1528                 se->se_uuid.bv_len = opc->suuid.bv_len;
1529
1530                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1531                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1532                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1533                 se->se_csn.bv_len = op->o_csn.bv_len;
1534                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1535
1536                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1537                 if ( sl->sl_head ) {
1538                         /* Keep the list in csn order. */
1539                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1540                                 sl->sl_tail->se_next = se;
1541                                 sl->sl_tail = se;
1542                         } else {
1543                                 slog_entry **sep;
1544
1545                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1546                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1547                                                 se->se_next = *sep;
1548                                                 *sep = se;
1549                                                 break;
1550                                         }
1551                                 }
1552                         }
1553                 } else {
1554                         sl->sl_head = se;
1555                         sl->sl_tail = se;
1556                         if ( !sl->sl_mincsn ) {
1557                                 sl->sl_numcsns = 1;
1558                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1559                                 sl->sl_sids = ch_malloc( sizeof( int ));
1560                                 sl->sl_sids[0] = se->se_sid;
1561                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1562                                 BER_BVZERO( &sl->sl_mincsn[1] );
1563                         }
1564                 }
1565                 sl->sl_num++;
1566                 while ( sl->sl_num > sl->sl_size ) {
1567                         int i, j;
1568                         se = sl->sl_head;
1569                         sl->sl_head = se->se_next;
1570                         for ( i=0; i<sl->sl_numcsns; i++ )
1571                                 if ( sl->sl_sids[i] >= se->se_sid )
1572                                         break;
1573                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1574                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1575                                         i, se->se_sid, &se->se_csn );
1576                         } else {
1577                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1578                         }
1579                         ch_free( se );
1580                         sl->sl_num--;
1581                 }
1582                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1583         }
1584 }
1585
1586 /* Just set a flag if we found the matching entry */
1587 static int
1588 playlog_cb( Operation *op, SlapReply *rs )
1589 {
1590         if ( rs->sr_type == REP_SEARCH ) {
1591                 op->o_callback->sc_private = (void *)1;
1592         }
1593         return rs->sr_err;
1594 }
1595
1596 /* enter with sl->sl_mutex locked, release before returning */
1597 static void
1598 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1599         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1600 {
1601         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1602         slog_entry *se;
1603         int i, j, ndel, num, nmods, mmods;
1604         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1605         BerVarray uuids;
1606         struct berval delcsn[2];
1607
1608         if ( !sl->sl_num ) {
1609                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1610                 return;
1611         }
1612
1613         num = sl->sl_num;
1614         i = 0;
1615         nmods = 0;
1616
1617         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1618                 num * UUID_LEN, op->o_tmpmemctx );
1619         uuids[0].bv_val = (char *)(uuids + num + 1);
1620
1621         delcsn[0].bv_len = 0;
1622         delcsn[0].bv_val = cbuf;
1623         BER_BVZERO(&delcsn[1]);
1624
1625         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1626          * and everything else at the end. Do this first so we can
1627          * unlock the list mutex.
1628          */
1629         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1630                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1631         for ( se=sl->sl_head; se; se=se->se_next ) {
1632                 int k;
1633                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1634                 ndel = 1;
1635                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1636                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1637                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1638                                 break;
1639                         }
1640                 }
1641                 if ( ndel <= 0 ) {
1642                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1643                         continue;
1644                 }
1645                 ndel = 0;
1646                 for ( k=0; k<numcsns; k++ ) {
1647                         if ( se->se_sid == sids[k] ) {
1648                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1649                                 break;
1650                         }
1651                 }
1652                 if ( ndel > 0 ) {
1653                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1654                         break;
1655                 }
1656                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1657                         j = i;
1658                         i++;
1659                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1660                         delcsn[0].bv_len = se->se_csn.bv_len;
1661                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1662                 } else {
1663                         if ( se->se_tag == LDAP_REQ_ADD )
1664                                 continue;
1665                         nmods++;
1666                         j = num - nmods;
1667                 }
1668                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1669                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1670                 uuids[j].bv_len = UUID_LEN;
1671         }
1672         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1673
1674         ndel = i;
1675
1676         /* Zero out unused slots */
1677         for ( i=ndel; i < num - nmods; i++ )
1678                 uuids[i].bv_len = 0;
1679
1680         /* Mods must be validated to see if they belong in this delete set.
1681          */
1682
1683         mmods = nmods;
1684         /* Strip any duplicates */
1685         for ( i=0; i<nmods; i++ ) {
1686                 for ( j=0; j<ndel; j++ ) {
1687                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1688                                 uuids[num - 1 - i].bv_len = 0;
1689                                 mmods --;
1690                                 break;
1691                         }
1692                 }
1693                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1694                 for ( j=0; j<i; j++ ) {
1695                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1696                                 uuids[num - 1 - i].bv_len = 0;
1697                                 mmods --;
1698                                 break;
1699                         }
1700                 }
1701         }
1702
1703         if ( mmods ) {
1704                 Operation fop;
1705                 int rc;
1706                 Filter mf, af;
1707                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1708                 slap_callback cb = {0};
1709
1710                 fop = *op;
1711
1712                 fop.o_sync_mode = 0;
1713                 fop.o_callback = &cb;
1714                 fop.ors_limit = NULL;
1715                 fop.ors_tlimit = SLAP_NO_LIMIT;
1716                 fop.ors_attrs = slap_anlist_all_attributes;
1717                 fop.ors_attrsonly = 0;
1718                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1719
1720                 af.f_choice = LDAP_FILTER_AND;
1721                 af.f_next = NULL;
1722                 af.f_and = &mf;
1723                 mf.f_choice = LDAP_FILTER_EQUALITY;
1724                 mf.f_ava = &eq;
1725                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1726                 mf.f_next = fop.ors_filter;
1727
1728                 fop.ors_filter = &af;
1729
1730                 cb.sc_response = playlog_cb;
1731                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1732
1733                 for ( i=ndel; i<num; i++ ) {
1734                   if ( uuids[i].bv_len != 0 ) {
1735                         SlapReply frs = { REP_RESULT };
1736
1737                         mf.f_av_value = uuids[i];
1738                         cb.sc_private = NULL;
1739                         fop.ors_slimit = 1;
1740                         rc = fop.o_bd->be_search( &fop, &frs );
1741
1742                         /* If entry was not found, add to delete list */
1743                         if ( !cb.sc_private ) {
1744                                 uuids[ndel++] = uuids[i];
1745                         }
1746                   }
1747                 }
1748                 fop.o_bd->bd_info = (BackendInfo *)on;
1749         }
1750         if ( ndel ) {
1751                 struct berval cookie;
1752
1753                 if ( delcsn[0].bv_len ) {
1754                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1755                                 slap_serverID ? slap_serverID : -1 );
1756
1757                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1758                 }
1759
1760                 uuids[ndel].bv_val = NULL;
1761                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1762                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1763                 if ( delcsn[0].bv_len ) {
1764                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1765                 }
1766         }
1767         op->o_tmpfree( uuids, op->o_tmpmemctx );
1768 }
1769
1770 static int
1771 syncprov_op_response( Operation *op, SlapReply *rs )
1772 {
1773         opcookie *opc = op->o_callback->sc_private;
1774         slap_overinst *on = opc->son;
1775         syncprov_info_t         *si = on->on_bi.bi_private;
1776         syncmatches *sm;
1777
1778         if ( rs->sr_err == LDAP_SUCCESS )
1779         {
1780                 struct berval maxcsn;
1781                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1782                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1783
1784                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1785
1786                 /* Update our context CSN */
1787                 cbuf[0] = '\0';
1788                 maxcsn.bv_val = cbuf;
1789                 maxcsn.bv_len = sizeof(cbuf);
1790                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1791
1792                 slap_get_commit_csn( op, &maxcsn, &foundit );
1793                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1794                         /* syncrepl queues the CSN values in the db where
1795                          * it is configured , not where the changes are made.
1796                          * So look for a value in the glue db if we didn't
1797                          * find any in this db.
1798                          */
1799                         BackendDB *be = op->o_bd;
1800                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1801                         maxcsn.bv_val = cbuf;
1802                         maxcsn.bv_len = sizeof(cbuf);
1803                         slap_get_commit_csn( op, &maxcsn, &foundit );
1804                         op->o_bd = be;
1805                 }
1806                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1807                         int i, sid;
1808 #ifdef CHECK_CSN
1809                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1810                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1811 #endif
1812                         sid = slap_parse_csn_sid( &maxcsn );
1813                         for ( i=0; i<si->si_numcsns; i++ ) {
1814                                 if ( sid < si->si_sids[i] )
1815                                         break;
1816                                 if ( sid == si->si_sids[i] ) {
1817                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1818                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1819                                                 csn_changed = 1;
1820                                         }
1821                                         break;
1822                                 }
1823                         }
1824                         /* It's a new SID for us */
1825                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1826                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1827                                         i, sid, &maxcsn );
1828                                 csn_changed = 1;
1829                         }
1830                 }
1831
1832                 /* Don't do any processing for consumer contextCSN updates */
1833                 if ( op->o_dont_replicate ) {
1834                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1835                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1836                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1837                         /* Catch contextCSN updates from syncrepl. We have to look at
1838                          * all the attribute values, as there may be more than one csn
1839                          * that changed, and only one can be passed in the csn queue.
1840                          */
1841                         Modifications *mod = op->orm_modlist;
1842                         unsigned i;
1843                         int j, sid;
1844
1845                         for ( i=0; i<mod->sml_numvals; i++ ) {
1846                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1847                                 for ( j=0; j<si->si_numcsns; j++ ) {
1848                                         if ( sid < si->si_sids[j] )
1849                                                 break;
1850                                         if ( sid == si->si_sids[j] ) {
1851                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1852                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1853                                                         csn_changed = 1;
1854                                                 }
1855                                                 break;
1856                                         }
1857                                 }
1858
1859                                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1860                                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1861                                                 j, sid, &mod->sml_values[i] );
1862                                         csn_changed = 1;
1863                                 }
1864                         }
1865                         if ( csn_changed )
1866                                 si->si_dirty = 0;
1867                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1868
1869                         if ( csn_changed ) {
1870                                 syncops *ss;
1871                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1872                                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1873                                         if ( ss->s_op->o_abandon )
1874                                                 continue;
1875                                         /* Send the updated csn to all syncrepl consumers,
1876                                          * including the server from which it originated.
1877                                          * The syncrepl consumer and syncprov provider on
1878                                          * the originating server may be configured to store
1879                                          * their csn values in different entries.
1880                                          */
1881                                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1882                                 }
1883                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1884                         }
1885                         } else {
1886                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1887                         }
1888                         goto leave;
1889                 }
1890
1891                 si->si_numops++;
1892                 if ( si->si_chkops || si->si_chktime ) {
1893                         /* Never checkpoint adding the context entry,
1894                          * it will deadlock
1895                          */
1896                         if ( op->o_tag != LDAP_REQ_ADD ||
1897                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1898                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1899                                         do_check = 1;
1900                                         si->si_numops = 0;
1901                                 }
1902                                 if ( si->si_chktime &&
1903                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1904                                         if ( si->si_chklast ) {
1905                                                 do_check = 1;
1906                                                 si->si_chklast = op->o_time;
1907                                         } else {
1908                                                 si->si_chklast = 1;
1909                                         }
1910                                 }
1911                         }
1912                 }
1913                 si->si_dirty = !csn_changed;
1914                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1915
1916                 if ( do_check ) {
1917                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1918                         syncprov_checkpoint( op, on );
1919                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1920                 }
1921
1922                 /* only update consumer ctx if this is a newer csn */
1923                 if ( csn_changed ) {
1924                         opc->sctxcsn = maxcsn;
1925                 }
1926
1927                 /* Handle any persistent searches */
1928                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1929                 have_psearches = ( si->si_ops != NULL );
1930                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1931                 if ( have_psearches ) {
1932                         switch(op->o_tag) {
1933                         case LDAP_REQ_ADD:
1934                         case LDAP_REQ_MODIFY:
1935                         case LDAP_REQ_MODRDN:
1936                         case LDAP_REQ_EXTENDED:
1937                                 syncprov_matchops( op, opc, 0 );
1938                                 break;
1939                         case LDAP_REQ_DELETE:
1940                                 /* for each match in opc->smatches:
1941                                  *   send DELETE msg
1942                                  */
1943                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1944                                         if ( sm->sm_op->s_op->o_abandon )
1945                                                 continue;
1946                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1947                                 }
1948                                 break;
1949                         }
1950                 }
1951
1952                 /* Add any log records */
1953                 if ( si->si_logs ) {
1954                         syncprov_add_slog( op );
1955                 }
1956 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1957         }
1958         return SLAP_CB_CONTINUE;
1959 }
1960
1961 /* We don't use a subentry to store the context CSN any more.
1962  * We expose the current context CSN as an operational attribute
1963  * of the suffix entry.
1964  */
1965 static int
1966 syncprov_op_compare( Operation *op, SlapReply *rs )
1967 {
1968         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1969         syncprov_info_t         *si = on->on_bi.bi_private;
1970         int rc = SLAP_CB_CONTINUE;
1971
1972         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1973                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1974         {
1975                 Entry e = {0};
1976                 Attribute a = {0};
1977
1978                 e.e_name = si->si_contextdn;
1979                 e.e_nname = si->si_contextdn;
1980                 e.e_attrs = &a;
1981
1982                 a.a_desc = slap_schema.si_ad_contextCSN;
1983
1984                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1985
1986                 a.a_vals = si->si_ctxcsn;
1987                 a.a_nvals = a.a_vals;
1988                 a.a_numvals = si->si_numcsns;
1989
1990                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1991                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1992                 if ( ! rs->sr_err ) {
1993                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1994                         goto return_results;
1995                 }
1996
1997                 if ( get_assert( op ) &&
1998                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1999                 {
2000                         rs->sr_err = LDAP_ASSERTION_FAILED;
2001                         goto return_results;
2002                 }
2003
2004
2005                 rs->sr_err = LDAP_COMPARE_FALSE;
2006
2007                 if ( attr_valfind( &a,
2008                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2009                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2010                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2011                 {
2012                         rs->sr_err = LDAP_COMPARE_TRUE;
2013                 }
2014
2015 return_results:;
2016
2017                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2018
2019                 send_ldap_result( op, rs );
2020
2021                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2022                         rs->sr_err = LDAP_SUCCESS;
2023                 }
2024                 rc = rs->sr_err;
2025         }
2026
2027         return rc;
2028 }
2029
2030 static int
2031 syncprov_op_mod( Operation *op, SlapReply *rs )
2032 {
2033         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2034         syncprov_info_t         *si = on->on_bi.bi_private;
2035         slap_callback *cb;
2036         opcookie *opc;
2037         int have_psearches, cbsize;
2038
2039         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2040         have_psearches = ( si->si_ops != NULL );
2041         si->si_active++;
2042         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2043
2044         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2045                 (have_psearches ? sizeof(modinst) : 0 );
2046
2047         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2048         opc = (opcookie *)(cb+1);
2049         opc->son = on;
2050         cb->sc_response = syncprov_op_response;
2051         cb->sc_cleanup = syncprov_op_cleanup;
2052         cb->sc_private = opc;
2053         cb->sc_next = op->o_callback;
2054         op->o_callback = cb;
2055
2056         opc->osid = -1;
2057         opc->rsid = -1;
2058         if ( op->o_csn.bv_val ) {
2059                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2060         }
2061         if ( op->o_controls ) {
2062                 struct sync_cookie *scook =
2063                 op->o_controls[slap_cids.sc_LDAPsync];
2064                 if ( scook )
2065                         opc->rsid = scook->sid;
2066         }
2067
2068         if ( op->o_dont_replicate )
2069                 return SLAP_CB_CONTINUE;
2070
2071         /* If there are active persistent searches, lock this operation.
2072          * See seqmod.c for the locking logic on its own.
2073          */
2074         if ( have_psearches ) {
2075                 modtarget *mt, mtdummy;
2076                 modinst *mi;
2077
2078                 mi = (modinst *)(opc+1);
2079                 mi->mi_op = op;
2080
2081                 /* See if we're already modifying this entry... */
2082                 mtdummy.mt_op = op;
2083                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2084                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2085                 if ( mt ) {
2086                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2087                         if ( mt->mt_mods == NULL ) {
2088                                 /* Cannot reuse this mt, as another thread is about
2089                                  * to release it in syncprov_op_cleanup.
2090                                  */
2091                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2092                                 mt = NULL;
2093                         }
2094                 }
2095                 if ( mt ) {
2096                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2097                         mt->mt_tail->mi_next = mi;
2098                         mt->mt_tail = mi;
2099                         /* wait for this op to get to head of list */
2100                         while ( mt->mt_mods != mi ) {
2101                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2102                                 /* FIXME: if dynamic config can delete overlays or
2103                                  * databases we'll have to check for cleanup here.
2104                                  * Currently it's not an issue because there are
2105                                  * no dynamic config deletes...
2106                                  */
2107                                 if ( slapd_shutdown )
2108                                         return SLAPD_ABANDON;
2109
2110                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2111                                         ldap_pvt_thread_yield();
2112                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2113
2114                                 /* clean up if the caller is giving up */
2115                                 if ( op->o_abandon ) {
2116                                         modinst *m2;
2117                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
2118                                                 m2 = m2->mi_next );
2119                                         m2->mi_next = mi->mi_next;
2120                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2121                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2122                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2123                                         return SLAPD_ABANDON;
2124                                 }
2125                         }
2126                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2127                 } else {
2128                         /* Record that we're modifying this entry now */
2129                         mt = ch_malloc( sizeof(modtarget) );
2130                         mt->mt_mods = mi;
2131                         mt->mt_tail = mi;
2132                         mt->mt_op = mi->mi_op;
2133                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2134                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2135                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2136                 }
2137                 opc->smt = mt;
2138         }
2139
2140         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2141                 syncprov_matchops( op, opc, 1 );
2142
2143         return SLAP_CB_CONTINUE;
2144 }
2145
2146 static int
2147 syncprov_op_extended( Operation *op, SlapReply *rs )
2148 {
2149         if ( exop_is_write( op ))
2150                 return syncprov_op_mod( op, rs );
2151
2152         return SLAP_CB_CONTINUE;
2153 }
2154
2155 typedef struct searchstate {
2156         slap_overinst *ss_on;
2157         syncops *ss_so;
2158         BerVarray ss_ctxcsn;
2159         int *ss_sids;
2160         int ss_numcsns;
2161 #define SS_PRESENT      0x01
2162 #define SS_CHANGED      0x02
2163         int ss_flags;
2164 } searchstate;
2165
2166 static int
2167 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2168 {
2169         if ( rs->sr_ctrls ) {
2170                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2171                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2172                 rs->sr_ctrls = NULL;
2173         }
2174         return 0;
2175 }
2176
2177 typedef struct SyncOperationBuffer {
2178         Operation               sob_op;
2179         Opheader                sob_hdr;
2180         OpExtra                 sob_oe;
2181         AttributeName   sob_extra;      /* not always present */
2182         /* Further data allocated here */
2183 } SyncOperationBuffer;
2184
2185 static void
2186 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2187 {
2188         SyncOperationBuffer *sopbuf2;
2189         Operation *op2;
2190         int i, alen = 0;
2191         size_t size;
2192         char *ptr;
2193         GroupAssertion *g1, *g2;
2194
2195         /* count the search attrs */
2196         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2197                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2198         }
2199         /* Make a new copy of the operation */
2200         size = offsetof( SyncOperationBuffer, sob_extra ) +
2201                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2202                 op->o_req_dn.bv_len + 1 +
2203                 op->o_req_ndn.bv_len + 1 +
2204                 op->o_ndn.bv_len + 1 +
2205                 so->s_filterstr.bv_len + 1;
2206         sopbuf2 = ch_calloc( 1, size );
2207         op2 = &sopbuf2->sob_op;
2208         op2->o_hdr = &sopbuf2->sob_hdr;
2209         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2210
2211         /* Copy the fields we care about explicitly, leave the rest alone */
2212         *op2->o_hdr = *op->o_hdr;
2213         op2->o_tag = op->o_tag;
2214         op2->o_time = op->o_time;
2215         op2->o_bd = on->on_info->oi_origdb;
2216         op2->o_request = op->o_request;
2217         op2->o_managedsait = op->o_managedsait;
2218         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2219         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2220
2221         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2222         if ( i ) {
2223                 op2->ors_attrs = (AttributeName *) ptr;
2224                 ptr = (char *) &op2->ors_attrs[i+1];
2225                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2226                         op2->ors_attrs[i] = op->ors_attrs[i];
2227                         op2->ors_attrs[i].an_name.bv_val = ptr;
2228                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2229                 }
2230                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2231         }
2232
2233         op2->o_authz = op->o_authz;
2234         op2->o_ndn.bv_val = ptr;
2235         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2236         op2->o_dn = op2->o_ndn;
2237         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2238         op2->o_req_dn.bv_val = ptr;
2239         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2240         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2241         op2->o_req_ndn.bv_val = ptr;
2242         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2243         op2->ors_filterstr.bv_val = ptr;
2244         strcpy( ptr, so->s_filterstr.bv_val );
2245         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2246
2247         /* Skip the AND/GE clause that we stuck on in front */
2248         if ( so->s_flags & PS_FIX_FILTER ) {
2249                 op2->ors_filter = op->ors_filter->f_and->f_next;
2250                 so->s_flags ^= PS_FIX_FILTER;
2251         } else {
2252                 op2->ors_filter = op->ors_filter;
2253         }
2254         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2255         so->s_op = op2;
2256
2257         /* Copy any cached group ACLs individually */
2258         op2->o_groups = NULL;
2259         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2260                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2261                 *g2 = *g1;
2262                 strcpy( g2->ga_ndn, g1->ga_ndn );
2263                 g2->ga_next = op2->o_groups;
2264                 op2->o_groups = g2;
2265         }
2266         /* Don't allow any further group caching */
2267         op2->o_do_not_cache = 1;
2268
2269         /* Add op2 to conn so abandon will find us */
2270         op->o_conn->c_n_ops_executing++;
2271         op->o_conn->c_n_ops_completed--;
2272         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2273         so->s_flags |= PS_IS_DETACHED;
2274
2275         /* Prevent anyone else from trying to send a result for this op */
2276         op->o_abandon = 1;
2277 }
2278
2279 static int
2280 syncprov_search_response( Operation *op, SlapReply *rs )
2281 {
2282         searchstate *ss = op->o_callback->sc_private;
2283         slap_overinst *on = ss->ss_on;
2284         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2285         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2286
2287         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2288                 Attribute *a;
2289                 /* If we got a referral without a referral object, there's
2290                  * something missing that we cannot replicate. Just ignore it.
2291                  * The consumer will abort because we didn't send the expected
2292                  * control.
2293                  */
2294                 if ( !rs->sr_entry ) {
2295                         assert( rs->sr_entry != NULL );
2296                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2297                         return SLAP_CB_CONTINUE;
2298                 }
2299                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2300                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2301                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2302                 }
2303                 if ( a ) {
2304                         int i, sid;
2305                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2306
2307                         /* Don't send changed entries back to the originator */
2308                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2309                                 Debug( LDAP_DEBUG_SYNC,
2310                                         "Entry %s changed by peer, ignored\n",
2311                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2312                                 return LDAP_SUCCESS;
2313                         }
2314
2315                         /* If not a persistent search */
2316                         if ( !ss->ss_so ) {
2317                                 /* Make sure entry is less than the snapshot'd contextCSN */
2318                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2319                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2320                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2321                                                 Debug( LDAP_DEBUG_SYNC,
2322                                                         "Entry %s CSN %s greater than snapshot %s\n",
2323                                                         rs->sr_entry->e_name.bv_val,
2324                                                         a->a_nvals[0].bv_val,
2325                                                         ss->ss_ctxcsn[i].bv_val );
2326                                                 return LDAP_SUCCESS;
2327                                         }
2328                                 }
2329                         }
2330
2331                         /* Don't send old entries twice */
2332                         if ( srs->sr_state.ctxcsn ) {
2333                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2334                                         if ( sid == srs->sr_state.sids[i] &&
2335                                                 ber_bvcmp( &a->a_nvals[0],
2336                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2337                                                 Debug( LDAP_DEBUG_SYNC,
2338                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2339                                                         rs->sr_entry->e_name.bv_val,
2340                                                         a->a_nvals[0].bv_val,
2341                                                         srs->sr_state.ctxcsn[i].bv_val );
2342                                                 return LDAP_SUCCESS;
2343                                         }
2344                                 }
2345                         }
2346                 }
2347                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2348                         op->o_tmpmemctx );
2349                 rs->sr_ctrls[1] = NULL;
2350                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2351                 /* If we're in delta-sync mode, always send a cookie */
2352                 if ( si->si_nopres && si->si_usehint && a ) {
2353                         struct berval cookie;
2354                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2355                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2356                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2357                 } else {
2358                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2359                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2360                 }
2361         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2362                 struct berval cookie = BER_BVNULL;
2363
2364                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2365                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2366                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2367                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2368
2369                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2370                 }
2371
2372                 /* Is this a regular refresh?
2373                  * Note: refresh never gets here if there were no changes
2374                  */
2375                 if ( !ss->ss_so ) {
2376                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2377                                 op->o_tmpmemctx );
2378                         rs->sr_ctrls[1] = NULL;
2379                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2380                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2381                                         LDAP_SYNC_REFRESH_DELETES );
2382                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2383                 } else {
2384                 /* It's RefreshAndPersist, transition to Persist phase */
2385                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2386                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2387                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2388                                 1, NULL, 0 );
2389                         if ( !BER_BVISNULL( &cookie ))
2390                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2391
2392                         /* Detach this Op from frontend control */
2393                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2394
2395                         /* But not if this connection was closed along the way */
2396                         if ( op->o_abandon ) {
2397                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2398                                 /* syncprov_ab_cleanup will free this syncop */
2399                                 return SLAPD_ABANDON;
2400
2401                         } else {
2402                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2403                                 /* Turn off the refreshing flag */
2404                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2405
2406                                 syncprov_detach_op( op, ss->ss_so, on );
2407
2408                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2409
2410                                 /* If there are queued responses, fire them off */
2411                                 if ( ss->ss_so->s_res )
2412                                         syncprov_qstart( ss->ss_so );
2413                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2414                         }
2415
2416                         return LDAP_SUCCESS;
2417                 }
2418         }
2419
2420         return SLAP_CB_CONTINUE;
2421 }
2422
2423 static int
2424 syncprov_op_search( Operation *op, SlapReply *rs )
2425 {
2426         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2427         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2428         slap_callback   *cb;
2429         int gotstate = 0, changed = 0, do_present = 0;
2430         syncops *sop = NULL;
2431         searchstate *ss;
2432         sync_control *srs;
2433         BerVarray ctxcsn;
2434         int i, *sids, numcsns;
2435         struct berval mincsn, maxcsn;
2436         int minsid, maxsid;
2437         int dirty = 0;
2438
2439         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2440
2441         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2442                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2443                 return rs->sr_err;
2444         }
2445
2446         srs = op->o_controls[slap_cids.sc_LDAPsync];
2447
2448         /* If this is a persistent search, set it up right away */
2449         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2450                 syncops so = {0};
2451                 fbase_cookie fc;
2452                 opcookie opc;
2453                 slap_callback sc;
2454
2455                 fc.fss = &so;
2456                 fc.fbase = 0;
2457                 so.s_eid = NOID;
2458                 so.s_op = op;
2459                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2460                 /* syncprov_findbase expects to be called as a callback... */
2461                 sc.sc_private = &opc;
2462                 opc.son = on;
2463                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2464                 cb = op->o_callback;
2465                 op->o_callback = &sc;
2466                 rs->sr_err = syncprov_findbase( op, &fc );
2467                 op->o_callback = cb;
2468                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2469
2470                 if ( rs->sr_err != LDAP_SUCCESS ) {
2471                         send_ldap_result( op, rs );
2472                         return rs->sr_err;
2473                 }
2474                 sop = ch_malloc( sizeof( syncops ));
2475                 *sop = so;
2476                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2477                 sop->s_rid = srs->sr_state.rid;
2478                 sop->s_sid = srs->sr_state.sid;
2479                 sop->s_inuse = 1;
2480
2481                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2482                 while ( si->si_active ) {
2483                         /* Wait for active mods to finish before proceeding, as they
2484                          * may already have inspected the si_ops list looking for
2485                          * consumers to replicate the change to.  Using the log
2486                          * doesn't help, as we may finish playing it before the
2487                          * active mods gets added to it.
2488                          */
2489                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2490                         if ( slapd_shutdown )
2491                                 return SLAPD_ABANDON;
2492                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2493                                 ldap_pvt_thread_yield();
2494                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2495                 }
2496                 sop->s_next = si->si_ops;
2497                 si->si_ops = sop;
2498                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2499         }
2500
2501         /* snapshot the ctxcsn */
2502         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2503         numcsns = si->si_numcsns;
2504         if ( numcsns ) {
2505                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2506                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2507                 for ( i=0; i<numcsns; i++ )
2508                         sids[i] = si->si_sids[i];
2509         } else {
2510                 ctxcsn = NULL;
2511                 sids = NULL;
2512         }
2513         dirty = si->si_dirty;
2514         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2515
2516         /* If we have a cookie, handle the PRESENT lookups */
2517         if ( srs->sr_state.ctxcsn ) {
2518                 sessionlog *sl;
2519                 int i, j;
2520
2521                 /* If we don't have any CSN of our own yet, pretend nothing
2522                  * has changed.
2523                  */
2524                 if ( !numcsns )
2525                         goto no_change;
2526
2527                 if ( !si->si_nopres )
2528                         do_present = SS_PRESENT;
2529
2530                 /* If there are SIDs we don't recognize in the cookie, drop them */
2531                 for (i=0; i<srs->sr_state.numcsns; ) {
2532                         for (j=i; j<numcsns; j++) {
2533                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2534                                         break;
2535                                 }
2536                         }
2537                         /* not found */
2538                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2539                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2540                                 srs->sr_state.numcsns--;
2541                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2542                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2543                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2544                                 }
2545                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2546                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2547                                 continue;
2548                         }
2549                         i++;
2550                 }
2551
2552                 if (srs->sr_state.numcsns != numcsns) {
2553                         /* consumer doesn't have the right number of CSNs */
2554                         changed = SS_CHANGED;
2555                         if ( srs->sr_state.ctxcsn ) {
2556                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2557                                 srs->sr_state.ctxcsn = NULL;
2558                         }
2559                         if ( srs->sr_state.sids ) {
2560                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2561                                 srs->sr_state.sids = NULL;
2562                         }
2563                         srs->sr_state.numcsns = 0;
2564                         goto shortcut;
2565                 }
2566
2567                 /* Find the smallest CSN which differs from contextCSN */
2568                 mincsn.bv_len = 0;
2569                 maxcsn.bv_len = 0;
2570                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2571                         int newer;
2572                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2573                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2574                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2575                                 maxcsn = srs->sr_state.ctxcsn[i];
2576                                 maxsid = sids[j];
2577                         }
2578                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2579                         /* If our state is newer, tell consumer about changes */
2580                         if ( newer < 0) {
2581                                 changed = SS_CHANGED;
2582                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2583                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2584                                         mincsn = srs->sr_state.ctxcsn[i];
2585                                         minsid = sids[j];
2586                                 }
2587                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2588                         /* our state is older, complain to consumer */
2589                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2590                                 rs->sr_text = "consumer state is newer than provider!";
2591 bailout:
2592                                 if ( sop ) {
2593                                         syncops **sp = &si->si_ops;
2594
2595                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2596                                         while ( *sp != sop )
2597                                                 sp = &(*sp)->s_next;
2598                                         *sp = sop->s_next;
2599                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2600                                         ch_free( sop );
2601                                 }
2602                                 rs->sr_ctrls = NULL;
2603                                 send_ldap_result( op, rs );
2604                                 return rs->sr_err;
2605                         }
2606                 }
2607                 if ( BER_BVISEMPTY( &mincsn )) {
2608                         mincsn = maxcsn;
2609                         minsid = maxsid;
2610                 }
2611
2612                 /* If nothing has changed, shortcut it */
2613                 if ( !changed && !dirty ) {
2614                         do_present = 0;
2615 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2616                                 LDAPControl     *ctrls[2];
2617
2618                                 ctrls[0] = NULL;
2619                                 ctrls[1] = NULL;
2620                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2621                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2622                                 rs->sr_ctrls = ctrls;
2623                                 rs->sr_err = LDAP_SUCCESS;
2624                                 send_ldap_result( op, rs );
2625                                 rs->sr_ctrls = NULL;
2626                                 return rs->sr_err;
2627                         }
2628                         goto shortcut;
2629                 }
2630
2631                 /* Do we have a sessionlog for this search? */
2632                 sl=si->si_logs;
2633                 if ( sl ) {
2634                         int do_play = 0;
2635                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2636                         /* Are there any log entries, and is the consumer state
2637                          * present in the session log?
2638                          */
2639                         if ( sl->sl_num > 0 ) {
2640                                 int i;
2641                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2642                                         /* SID not present == new enough */
2643                                         if ( minsid < sl->sl_sids[i] ) {
2644                                                 do_play = 1;
2645                                                 break;
2646                                         }
2647                                         /* SID present and new enough */
2648                                         if ( minsid == sl->sl_sids[i]
2649                                                 && ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 ) {
2650                                                 do_play = 1;
2651                                                 break;
2652                                         }
2653                                 }
2654                                 /* SID not present == new enough */
2655                                 if ( i == sl->sl_numcsns )
2656                                         do_play = 1;
2657                         }
2658                         if ( do_play ) {
2659                                 do_present = 0;
2660                                 /* mutex is unlocked in playlog */
2661                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2662                         } else {
2663                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2664                         }
2665                 }
2666                 /* Is the CSN still present in the database? */
2667                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2668                         /* No, so a reload is required */
2669                         /* the 2.2 consumer doesn't send this hint */
2670                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2671                                 if ( ctxcsn )
2672                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2673                                 if ( sids )
2674                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2675                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2676                                 rs->sr_text = "sync cookie is stale";
2677                                 goto bailout;
2678                         }
2679                         if ( srs->sr_state.ctxcsn ) {
2680                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2681                                 srs->sr_state.ctxcsn = NULL;
2682                         }
2683                         if ( srs->sr_state.sids ) {
2684                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2685                                 srs->sr_state.sids = NULL;
2686                         }
2687                         srs->sr_state.numcsns = 0;
2688                 } else {
2689                         gotstate = 1;
2690                         /* If changed and doing Present lookup, send Present UUIDs */
2691                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2692                                 LDAP_SUCCESS ) {
2693                                 if ( ctxcsn )
2694                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2695                                 if ( sids )
2696                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2697                                 goto bailout;
2698                         }
2699                 }
2700         } else {
2701                 /* No consumer state, assume something has changed */
2702                 changed = SS_CHANGED;
2703         }
2704
2705 shortcut:
2706         /* Append CSN range to search filter, save original filter
2707          * for persistent search evaluation
2708          */
2709         if ( sop ) {
2710                 sop->s_filterstr= op->ors_filterstr;
2711         }
2712
2713         /* If something changed, find the changes */
2714         if ( gotstate && ( changed || dirty ) ) {
2715                 Filter *fand, *fava;
2716
2717                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2718                 fand->f_choice = LDAP_FILTER_AND;
2719                 fand->f_next = NULL;
2720                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2721                 fand->f_and = fava;
2722                 fava->f_choice = LDAP_FILTER_GE;
2723                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2724                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2725 #ifdef LDAP_COMP_MATCH
2726                 fava->f_ava->aa_cf = NULL;
2727 #endif
2728                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2729                 fava->f_next = op->ors_filter;
2730                 if ( sop )
2731                         ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2732                 op->ors_filter = fand;
2733                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2734                 if ( sop ) {
2735                         sop->s_flags |= PS_FIX_FILTER;
2736                         ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2737                 }
2738         }
2739
2740         /* Let our callback add needed info to returned entries */
2741         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2742         ss = (searchstate *)(cb+1);
2743         ss->ss_on = on;
2744         ss->ss_so = sop;
2745         ss->ss_flags = do_present | changed;
2746         ss->ss_ctxcsn = ctxcsn;
2747         ss->ss_numcsns = numcsns;
2748         ss->ss_sids = sids;
2749         cb->sc_response = syncprov_search_response;
2750         cb->sc_cleanup = syncprov_search_cleanup;
2751         cb->sc_private = ss;
2752         cb->sc_next = op->o_callback;
2753         op->o_callback = cb;
2754
2755         /* If this is a persistent search and no changes were reported during
2756          * the refresh phase, just invoke the response callback to transition
2757          * us into persist phase
2758          */
2759         if ( !changed && !dirty ) {
2760                 rs->sr_err = LDAP_SUCCESS;
2761                 rs->sr_nentries = 0;
2762                 send_ldap_result( op, rs );
2763                 return rs->sr_err;
2764         }
2765         return SLAP_CB_CONTINUE;
2766 }
2767
2768 static int
2769 syncprov_operational(
2770         Operation *op,
2771         SlapReply *rs )
2772 {
2773         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2774         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2775
2776         /* This prevents generating unnecessarily; frontend will strip
2777          * any statically stored copy.
2778          */
2779         if ( op->o_sync != SLAP_CONTROL_NONE )
2780                 return SLAP_CB_CONTINUE;
2781
2782         if ( rs->sr_entry &&
2783                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2784
2785                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2786                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2787                         Attribute *a, **ap = NULL;
2788
2789                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2790                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2791                                         break;
2792                         }
2793
2794                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2795                         if ( si->si_ctxcsn ) {
2796                                 if ( !a ) {
2797                                         for ( ap = &rs->sr_operational_attrs; *ap;
2798                                                 ap=&(*ap)->a_next );
2799
2800                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2801                                         *ap = a;
2802                                 }
2803
2804                                 if ( !ap ) {
2805                                         if ( rs_entry2modifiable( op, rs, on )) {
2806                                                 a = attr_find( rs->sr_entry->e_attrs,
2807                                                         slap_schema.si_ad_contextCSN );
2808                                         }
2809                                         if ( a->a_nvals != a->a_vals ) {
2810                                                 ber_bvarray_free( a->a_nvals );
2811                                         }
2812                                         a->a_nvals = NULL;
2813                                         ber_bvarray_free( a->a_vals );
2814                                         a->a_vals = NULL;
2815                                         a->a_numvals = 0;
2816                                 }
2817                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2818                         }
2819                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2820                 }
2821         }
2822         return SLAP_CB_CONTINUE;
2823 }
2824
2825 enum {
2826         SP_CHKPT = 1,
2827         SP_SESSL,
2828         SP_NOPRES,
2829         SP_USEHINT
2830 };
2831
2832 static ConfigDriver sp_cf_gen;
2833
2834 static ConfigTable spcfg[] = {
2835         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2836                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2837                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2838                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2839         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2840                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2841                         "DESC 'Session log size in ops' "
2842                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2843         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2844                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2845                         "DESC 'Omit Present phase processing' "
2846                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2847         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2848                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2849                         "DESC 'Observe Reload Hint in Request control' "
2850                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2851         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2852 };
2853
2854 static ConfigOCs spocs[] = {
2855         { "( OLcfgOvOc:1.1 "
2856                 "NAME 'olcSyncProvConfig' "
2857                 "DESC 'SyncRepl Provider configuration' "
2858                 "SUP olcOverlayConfig "
2859                 "MAY ( olcSpCheckpoint "
2860                         "$ olcSpSessionlog "
2861                         "$ olcSpNoPresent "
2862                         "$ olcSpReloadHint "
2863                 ") )",
2864                         Cft_Overlay, spcfg },
2865         { NULL, 0, NULL }
2866 };
2867
2868 static int
2869 sp_cf_gen(ConfigArgs *c)
2870 {
2871         slap_overinst           *on = (slap_overinst *)c->bi;
2872         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2873         int rc = 0;
2874
2875         if ( c->op == SLAP_CONFIG_EMIT ) {
2876                 switch ( c->type ) {
2877                 case SP_CHKPT:
2878                         if ( si->si_chkops || si->si_chktime ) {
2879                                 struct berval bv;
2880                                 /* we assume si_chktime is a multiple of 60
2881                                  * because the parsed value was originally
2882                                  * multiplied by 60 */
2883                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2884                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2885                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2886                                         rc = 1;
2887                                 } else {
2888                                         bv.bv_val = c->cr_msg;
2889                                         value_add_one( &c->rvalue_vals, &bv );
2890                                 }
2891                         } else {
2892                                 rc = 1;
2893                         }
2894                         break;
2895                 case SP_SESSL:
2896                         if ( si->si_logs ) {
2897                                 c->value_int = si->si_logs->sl_size;
2898                         } else {
2899                                 rc = 1;
2900                         }
2901                         break;
2902                 case SP_NOPRES:
2903                         if ( si->si_nopres ) {
2904                                 c->value_int = 1;
2905                         } else {
2906                                 rc = 1;
2907                         }
2908                         break;
2909                 case SP_USEHINT:
2910                         if ( si->si_usehint ) {
2911                                 c->value_int = 1;
2912                         } else {
2913                                 rc = 1;
2914                         }
2915                         break;
2916                 }
2917                 return rc;
2918         } else if ( c->op == LDAP_MOD_DELETE ) {
2919                 switch ( c->type ) {
2920                 case SP_CHKPT:
2921                         si->si_chkops = 0;
2922                         si->si_chktime = 0;
2923                         break;
2924                 case SP_SESSL:
2925                         if ( si->si_logs )
2926                                 si->si_logs->sl_size = 0;
2927                         else
2928                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2929                         break;
2930                 case SP_NOPRES:
2931                         if ( si->si_nopres )
2932                                 si->si_nopres = 0;
2933                         else
2934                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2935                         break;
2936                 case SP_USEHINT:
2937                         if ( si->si_usehint )
2938                                 si->si_usehint = 0;
2939                         else
2940                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2941                         break;
2942                 }
2943                 return rc;
2944         }
2945         switch ( c->type ) {
2946         case SP_CHKPT:
2947                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2948                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2949                                 c->argv[0], c->argv[1] );
2950                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2951                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2952                         return ARG_BAD_CONF;
2953                 }
2954                 if ( si->si_chkops <= 0 ) {
2955                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2956                                 c->argv[0], si->si_chkops );
2957                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2958                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2959                         return ARG_BAD_CONF;
2960                 }
2961                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2962                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2963                                 c->argv[0], c->argv[1] );
2964                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2965                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2966                         return ARG_BAD_CONF;
2967                 }
2968                 if ( si->si_chktime <= 0 ) {
2969                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2970                                 c->argv[0], si->si_chkops );
2971                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2972                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2973                         return ARG_BAD_CONF;
2974                 }
2975                 si->si_chktime *= 60;
2976                 break;
2977         case SP_SESSL: {
2978                 sessionlog *sl;
2979                 int size = c->value_int;
2980
2981                 if ( size < 0 ) {
2982                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2983                                 c->argv[0], size );
2984                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2985                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2986                         return ARG_BAD_CONF;
2987                 }
2988                 sl = si->si_logs;
2989                 if ( !sl ) {
2990                         sl = ch_malloc( sizeof( sessionlog ));
2991                         sl->sl_mincsn = NULL;
2992                         sl->sl_sids = NULL;
2993                         sl->sl_num = 0;
2994                         sl->sl_numcsns = 0;
2995                         sl->sl_head = sl->sl_tail = NULL;
2996                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2997                         si->si_logs = sl;
2998                 }
2999                 sl->sl_size = size;
3000                 }
3001                 break;
3002         case SP_NOPRES:
3003                 si->si_nopres = c->value_int;
3004                 break;
3005         case SP_USEHINT:
3006                 si->si_usehint = c->value_int;
3007                 break;
3008         }
3009         return rc;
3010 }
3011
3012 /* ITS#3456 we cannot run this search on the main thread, must use a
3013  * child thread in order to insure we have a big enough stack.
3014  */
3015 static void *
3016 syncprov_db_otask(
3017         void *ptr
3018 )
3019 {
3020         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3021         return NULL;
3022 }
3023
3024
3025 /* Read any existing contextCSN from the underlying db.
3026  * Then search for any entries newer than that. If no value exists,
3027  * just generate it. Cache whatever result.
3028  */
3029 static int
3030 syncprov_db_open(
3031         BackendDB *be,
3032         ConfigReply *cr
3033 )
3034 {
3035         slap_overinst   *on = (slap_overinst *) be->bd_info;
3036         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3037
3038         Connection conn = { 0 };
3039         OperationBuffer opbuf;
3040         Operation *op;
3041         Entry *e = NULL;
3042         Attribute *a;
3043         int rc;
3044         void *thrctx = NULL;
3045
3046         if ( !SLAP_LASTMOD( be )) {
3047                 Debug( LDAP_DEBUG_ANY,
3048                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3049                 return -1;
3050         }
3051
3052         if ( slapMode & SLAP_TOOL_MODE ) {
3053                 return 0;
3054         }
3055
3056         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3057         if ( rc ) {
3058                 return rc;
3059         }
3060
3061         thrctx = ldap_pvt_thread_pool_context();
3062         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3063         op = &opbuf.ob_op;
3064         op->o_bd = be;
3065         op->o_dn = be->be_rootdn;
3066         op->o_ndn = be->be_rootndn;
3067
3068         if ( SLAP_SYNC_SUBENTRY( be )) {
3069                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3070                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3071         } else {
3072                 si->si_contextdn = be->be_nsuffix[0];
3073         }
3074         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3075                 slap_schema.si_ad_contextCSN, 0, &e, on );
3076
3077         if ( e ) {
3078                 ldap_pvt_thread_t tid;
3079
3080                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3081                 if ( a ) {
3082                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3083                         si->si_numcsns = a->a_numvals;
3084                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3085                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3086                 }
3087                 overlay_entry_release_ov( op, e, 0, on );
3088                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3089                         op->o_req_dn = be->be_suffix[0];
3090                         op->o_req_ndn = be->be_nsuffix[0];
3091                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3092                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3093                         ldap_pvt_thread_join( tid, NULL );
3094                 }
3095         }
3096
3097         /* Didn't find a contextCSN, should we generate one? */
3098         if ( !si->si_ctxcsn ) {
3099                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3100                 struct berval csn;
3101
3102                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
3103                 /* If we're also a consumer, then don't generate anything.
3104                  * Wait for our provider to send it to us, or for a local
3105                  * modify if we have multimaster.
3106                  */
3107                         goto out;
3108                 }
3109                 csn.bv_val = csnbuf;
3110                 csn.bv_len = sizeof( csnbuf );
3111                 slap_get_csn( op, &csn, 0 );
3112                 value_add_one( &si->si_ctxcsn, &csn );
3113                 si->si_numcsns = 1;
3114                 si->si_sids = ch_malloc( sizeof(int) );
3115                 si->si_sids[0] = slap_serverID;
3116
3117                 /* make sure we do a checkpoint on close */
3118                 si->si_numops++;
3119         }
3120
3121         /* Initialize the sessionlog mincsn */
3122         if ( si->si_logs && si->si_numcsns ) {
3123                 sessionlog *sl = si->si_logs;
3124                 int i;
3125                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3126                 sl->sl_numcsns = si->si_numcsns;
3127                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3128                 for ( i=0; i < si->si_numcsns; i++ )
3129                         sl->sl_sids[i] = si->si_sids[i];
3130         }
3131
3132 out:
3133         op->o_bd->bd_info = (BackendInfo *)on;
3134         return 0;
3135 }
3136
3137 /* Write the current contextCSN into the underlying db.
3138  */
3139 static int
3140 syncprov_db_close(
3141         BackendDB *be,
3142         ConfigReply *cr
3143 )
3144 {
3145     slap_overinst   *on = (slap_overinst *) be->bd_info;
3146     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3147 #ifdef SLAP_CONFIG_DELETE
3148         syncops *so, *sonext;
3149 #endif /* SLAP_CONFIG_DELETE */
3150
3151         if ( slapMode & SLAP_TOOL_MODE ) {
3152                 return 0;
3153         }
3154         if ( si->si_numops ) {
3155                 Connection conn = {0};
3156                 OperationBuffer opbuf;
3157                 Operation *op;
3158                 void *thrctx;
3159
3160                 thrctx = ldap_pvt_thread_pool_context();
3161                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3162                 op = &opbuf.ob_op;
3163                 op->o_bd = be;
3164                 op->o_dn = be->be_rootdn;
3165                 op->o_ndn = be->be_rootndn;
3166                 syncprov_checkpoint( op, on );
3167         }
3168
3169 #ifdef SLAP_CONFIG_DELETE
3170         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
3171         for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3172                 SlapReply rs = {REP_RESULT};
3173                 rs.sr_err = LDAP_UNAVAILABLE;
3174                 send_ldap_result( so->s_op, &rs );
3175                 sonext=so->s_next;
3176                 syncprov_drop_psearch( so, 0);
3177         }
3178         si->si_ops=NULL;
3179         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
3180         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3181 #endif /* SLAP_CONFIG_DELETE */
3182
3183     return 0;
3184 }
3185
3186 static int
3187 syncprov_db_init(
3188         BackendDB *be,
3189         ConfigReply *cr
3190 )
3191 {
3192         slap_overinst   *on = (slap_overinst *)be->bd_info;
3193         syncprov_info_t *si;
3194
3195         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3196                 Debug( LDAP_DEBUG_ANY,
3197                         "syncprov must be instantiated within a database.\n",
3198                         0, 0, 0 );
3199                 return 1;
3200         }
3201
3202         si = ch_calloc(1, sizeof(syncprov_info_t));
3203         on->on_bi.bi_private = si;
3204         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3205         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3206         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3207         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3208
3209         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3210         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3211         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3212         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3213
3214         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3215         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3216
3217         return 0;
3218 }
3219
3220 static int
3221 syncprov_db_destroy(
3222         BackendDB *be,
3223         ConfigReply *cr
3224 )
3225 {
3226         slap_overinst   *on = (slap_overinst *)be->bd_info;
3227         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3228
3229         if ( si ) {
3230                 if ( si->si_logs ) {
3231                         sessionlog *sl = si->si_logs;
3232                         slog_entry *se = sl->sl_head;
3233
3234                         while ( se ) {
3235                                 slog_entry *se_next = se->se_next;
3236                                 ch_free( se );
3237                                 se = se_next;
3238                         }
3239                         if ( sl->sl_mincsn )
3240                                 ber_bvarray_free( sl->sl_mincsn );
3241                         if ( sl->sl_sids )
3242                                 ch_free( sl->sl_sids );
3243
3244                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3245                         ch_free( si->si_logs );
3246                 }
3247                 if ( si->si_ctxcsn )
3248                         ber_bvarray_free( si->si_ctxcsn );
3249                 if ( si->si_sids )
3250                         ch_free( si->si_sids );
3251                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3252                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3253                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3254                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3255                 ch_free( si );
3256         }
3257
3258         return 0;
3259 }
3260
3261 static int syncprov_parseCtrl (
3262         Operation *op,
3263         SlapReply *rs,
3264         LDAPControl *ctrl )
3265 {
3266         ber_tag_t tag;
3267         BerElementBuffer berbuf;
3268         BerElement *ber = (BerElement *)&berbuf;
3269         ber_int_t mode;
3270         ber_len_t len;
3271         struct berval cookie = BER_BVNULL;
3272         sync_control *sr;
3273         int rhint = 0;
3274
3275         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3276                 rs->sr_text = "Sync control specified multiple times";
3277                 return LDAP_PROTOCOL_ERROR;
3278         }
3279
3280         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3281                 rs->sr_text = "Sync control specified with pagedResults control";
3282                 return LDAP_PROTOCOL_ERROR;
3283         }
3284
3285         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3286                 rs->sr_text = "Sync control value is absent";
3287                 return LDAP_PROTOCOL_ERROR;
3288         }
3289
3290         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3291                 rs->sr_text = "Sync control value is empty";
3292                 return LDAP_PROTOCOL_ERROR;
3293         }
3294
3295         /* Parse the control value
3296          *      syncRequestValue ::= SEQUENCE {
3297          *              mode   ENUMERATED {
3298          *                      -- 0 unused
3299          *                      refreshOnly             (1),
3300          *                      -- 2 reserved
3301          *                      refreshAndPersist       (3)
3302          *              },
3303          *              cookie  syncCookie OPTIONAL
3304          *      }
3305          */
3306
3307         ber_init2( ber, &ctrl->ldctl_value, 0 );
3308
3309         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3310                 rs->sr_text = "Sync control : mode decoding error";
3311                 return LDAP_PROTOCOL_ERROR;
3312         }
3313
3314         switch( mode ) {
3315         case LDAP_SYNC_REFRESH_ONLY:
3316                 mode = SLAP_SYNC_REFRESH;
3317                 break;
3318         case LDAP_SYNC_REFRESH_AND_PERSIST:
3319                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3320                 break;
3321         default:
3322                 rs->sr_text = "Sync control : unknown update mode";
3323                 return LDAP_PROTOCOL_ERROR;
3324         }
3325
3326         tag = ber_peek_tag( ber, &len );
3327
3328         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3329                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3330                         rs->sr_text = "Sync control : cookie decoding error";
3331                         return LDAP_PROTOCOL_ERROR;
3332                 }
3333                 tag = ber_peek_tag( ber, &len );
3334         }
3335         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3336                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3337                         rs->sr_text = "Sync control : rhint decoding error";
3338                         return LDAP_PROTOCOL_ERROR;
3339                 }
3340         }
3341         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3342                         rs->sr_text = "Sync control : decoding error";
3343                         return LDAP_PROTOCOL_ERROR;
3344         }
3345         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3346         sr->sr_rhint = rhint;
3347         if (!BER_BVISNULL(&cookie)) {
3348                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3349                 /* If parse fails, pretend no cookie was sent */
3350                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3351                         sr->sr_state.rid == -1 ) {
3352                         if ( sr->sr_state.ctxcsn ) {
3353                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3354                                 sr->sr_state.ctxcsn = NULL;
3355                         }
3356                         sr->sr_state.numcsns = 0;
3357                 }
3358         }
3359
3360         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3361
3362         op->o_sync = ctrl->ldctl_iscritical
3363                 ? SLAP_CONTROL_CRITICAL
3364                 : SLAP_CONTROL_NONCRITICAL;
3365
3366         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3367
3368         return LDAP_SUCCESS;
3369 }
3370
3371 /* This overlay is set up for dynamic loading via moduleload. For static
3372  * configuration, you'll need to arrange for the slap_overinst to be
3373  * initialized and registered by some other function inside slapd.
3374  */
3375
3376 static slap_overinst            syncprov;
3377
3378 int
3379 syncprov_initialize()
3380 {
3381         int rc;
3382
3383         rc = register_supported_control( LDAP_CONTROL_SYNC,
3384                 SLAP_CTRL_SEARCH, NULL,
3385                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3386         if ( rc != LDAP_SUCCESS ) {
3387                 Debug( LDAP_DEBUG_ANY,
3388                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3389                 return rc;
3390         }
3391
3392         syncprov.on_bi.bi_type = "syncprov";
3393         syncprov.on_bi.bi_db_init = syncprov_db_init;
3394         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3395         syncprov.on_bi.bi_db_open = syncprov_db_open;
3396         syncprov.on_bi.bi_db_close = syncprov_db_close;
3397
3398         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3399         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3400
3401         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3402         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3403         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3404         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3405         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3406         syncprov.on_bi.bi_op_search = syncprov_op_search;
3407         syncprov.on_bi.bi_extended = syncprov_op_extended;
3408         syncprov.on_bi.bi_operational = syncprov_operational;
3409
3410         syncprov.on_bi.bi_cf_ocs = spocs;
3411
3412         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3413
3414         rc = config_register_schema( spcfg, spocs );
3415         if ( rc ) return rc;
3416
3417         return overlay_register( &syncprov );
3418 }
3419
3420 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3421 int
3422 init_module( int argc, char *argv[] )
3423 {
3424         return syncprov_initialize();
3425 }
3426 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3427
3428 #endif /* defined(SLAPD_OVER_SYNCPROV) */