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 2004-2012 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                 LDAP_SLIST_INIT( &fop.o_extra );
 443                 fop.o_tag = LDAP_REQ_SEARCH;
 444                 fop.ors_scope = LDAP_SCOPE_BASE;
 445                 fop.ors_limit = NULL;
 446                 fop.ors_slimit = 1;
 447                 fop.ors_tlimit = SLAP_NO_LIMIT;
 448                 fop.ors_attrs = slap_anlist_no_attrs;
 449                 fop.ors_attrsonly = 1;
 450                 fop.ors_filter = &generic_filter;
 451                 fop.ors_filterstr = generic_filterstr;
 452
 453                 rc = fop.o_bd->be_search( &fop, &frs );
 454         } else {
 455                 ldap_pvt_thread_mutex_unlock( &fc->fss->s_mutex );
 456                 fc->fbase = 1;
 457         }
 458
 459         /* After the first call, see if the fdn resides in the scope */
 460         if ( fc->fbase == 1 ) {
 461                 switch ( fc->fss->s_op->ors_scope ) {
 462                 case LDAP_SCOPE_BASE:
 463                         fc->fscope = dn_match( fc->fdn, &fc->fss->s_base );
 464                         break;
 465                 case LDAP_SCOPE_ONELEVEL: {
 466                         struct berval pdn;
 467                         dnParent( fc->fdn, &pdn );
 468                         fc->fscope = dn_match( &pdn, &fc->fss->s_base );
 469                         break; }
 470                 case LDAP_SCOPE_SUBTREE:
 471                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base );
 472                         break;
 473                 case LDAP_SCOPE_SUBORDINATE:
 474                         fc->fscope = dnIsSuffix( fc->fdn, &fc->fss->s_base ) &&
 475                                 !dn_match( fc->fdn, &fc->fss->s_base );
 476                         break;
 477                 }
 478         }
 479
 480         if ( fc->fbase )
 481                 return LDAP_SUCCESS;
 482
 483         /* If entryID has changed, then the base of this search has
 484          * changed. Invalidate the psearch.
 485          */
 486         return LDAP_NO_SUCH_OBJECT;
 487 }
 488
 489 /* syncprov_findcsn:
 490  *   This function has three different purposes, but they all use a search
 491  * that filters on entryCSN so they're combined here.
 492  * 1: at startup time, after a contextCSN has been read from the database,
 493  * we search for all entries with CSN >= contextCSN in case the contextCSN
 494  * was not checkpointed at the previous shutdown.
 495  *
 496  * 2: when the current contextCSN is known and we have a sync cookie, we search
 497  * for one entry with CSN = the cookie CSN. If not found, try <= cookie CSN.
 498  * If an entry is found, the cookie CSN is valid, otherwise it is stale.
 499  *
 500  * 3: during a refresh phase, we search for all entries with CSN <= the cookie
 501  * CSN, and generate Present records for them. We always collect this result
 502  * in SyncID sets, even if there's only one match.
 503  */
 504 typedef enum find_csn_t {
 505         FIND_MAXCSN     = 1,
 506         FIND_CSN        = 2,
 507         FIND_PRESENT    = 3
 508 } find_csn_t;
 509
 510 static int
 511 findmax_cb( Operation *op, SlapReply *rs )
 512 {
 513         if ( rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS ) {
 514                 struct berval *maxcsn = op->o_callback->sc_private;
 515                 Attribute *a = attr_find( rs->sr_entry->e_attrs,
 516                         slap_schema.si_ad_entryCSN );
 517
 518                 if ( a && ber_bvcmp( &a->a_vals[0], maxcsn ) > 0 &&
 519                         slap_parse_csn_sid( &a->a_vals[0] ) == slap_serverID ) {
 520                         maxcsn->bv_len = a->a_vals[0].bv_len;
 521                         strcpy( maxcsn->bv_val, a->a_vals[0].bv_val );
 522                 }
 523         }
 524         return LDAP_SUCCESS;
 525 }
 526
 527 static int
 528 findcsn_cb( Operation *op, SlapReply *rs )
 529 {
 530         slap_callback *sc = op->o_callback;
 531
 532         /* We just want to know that at least one exists, so it's OK if
 533          * we exceed the unchecked limit.
 534          */
 535         if ( rs->sr_err == LDAP_ADMINLIMIT_EXCEEDED ||
 536                 (rs->sr_type == REP_SEARCH && rs->sr_err == LDAP_SUCCESS )) {
 537                 sc->sc_private = (void *)1;
 538         }
 539         return LDAP_SUCCESS;
 540 }
 541
 542 /* Build a list of entryUUIDs for sending in a SyncID set */
 543
 544 #define UUID_LEN        16
 545
 546 typedef struct fpres_cookie {
 547         int num;
 548         BerVarray uuids;
 549         char *last;
 550 } fpres_cookie;
 551
 552 static int
 553 findpres_cb( Operation *op, SlapReply *rs )
 554 {
 555         slap_callback *sc = op->o_callback;
 556         fpres_cookie *pc = sc->sc_private;
 557         Attribute *a;
 558         int ret = SLAP_CB_CONTINUE;
 559
 560         switch ( rs->sr_type ) {
 561         case REP_SEARCH:
 562                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );
 563                 if ( a ) {
 564                         pc->uuids[pc->num].bv_val = pc->last;
 565                         AC_MEMCPY( pc->uuids[pc->num].bv_val, a->a_nvals[0].bv_val,
 566                                 pc->uuids[pc->num].bv_len );
 567                         pc->num++;
 568                         pc->last = pc->uuids[pc->num].bv_val;
 569                         pc->uuids[pc->num].bv_val = NULL;
 570                 }
 571                 ret = LDAP_SUCCESS;
 572                 if ( pc->num != SLAP_SYNCUUID_SET_SIZE )
 573                         break;
 574                 /* FALLTHRU */
 575         case REP_RESULT:
 576                 ret = rs->sr_err;
 577                 if ( pc->num ) {
 578                         ret = syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET, NULL,
 579                                 0, pc->uuids, 0 );
 580                         pc->uuids[pc->num].bv_val = pc->last;
 581                         pc->num = 0;
 582                         pc->last = pc->uuids[0].bv_val;
 583                 }
 584                 break;
 585         default:
 586                 break;
 587         }
 588         return ret;
 589 }
 590
 591 static int
 592 syncprov_findcsn( Operation *op, find_csn_t mode, struct berval *csn )
 593 {
 594         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
 595         syncprov_info_t         *si = on->on_bi.bi_private;
 596
 597         slap_callback cb = {0};
 598         Operation fop;
 599         SlapReply frs = { REP_RESULT };
 600         char buf[LDAP_PVT_CSNSTR_BUFSIZE + STRLENOF("(entryCSN<=)")];
 601         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
 602         struct berval maxcsn;
 603         Filter cf;
 604         AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
 605         fpres_cookie pcookie;
 606         sync_control *srs = NULL;
 607         struct slap_limits_set fc_limits;
 608         int i, rc = LDAP_SUCCESS, findcsn_retry = 1;
 609         int maxid;
 610
 611         if ( mode != FIND_MAXCSN ) {
 612                 srs = op->o_controls[slap_cids.sc_LDAPsync];
 613         }
 614
 615         fop = *op;
 616         fop.o_sync_mode &= SLAP_CONTROL_MASK;   /* turn off sync_mode */
 617         /* We want pure entries, not referrals */
 618         fop.o_managedsait = SLAP_CONTROL_CRITICAL;
 619
 620         cf.f_ava = &eq;
 621         cf.f_av_desc = slap_schema.si_ad_entryCSN;
 622         BER_BVZERO( &cf.f_av_value );
 623         cf.f_next = NULL;
 624
 625         fop.o_callback = &cb;
 626         fop.ors_limit = NULL;
 627         fop.ors_tlimit = SLAP_NO_LIMIT;
 628         fop.ors_filter = &cf;
 629         fop.ors_filterstr.bv_val = buf;
 630
 631 again:
 632         switch( mode ) {
 633         case FIND_MAXCSN:
 634                 cf.f_choice = LDAP_FILTER_GE;
 635                 /* If there are multiple CSNs, use the one with our serverID */
 636                 for ( i=0; i<si->si_numcsns; i++) {
 637                         if ( slap_serverID == si->si_sids[i] ) {
 638                                 maxid = i;
 639                                 break;
 640                         }
 641                 }
 642                 if ( i == si->si_numcsns ) {
 643                         /* No match: this is multimaster, and none of the content in the DB
 644                          * originated locally. Treat like no CSN.
 645                          */
 646                         return LDAP_NO_SUCH_OBJECT;
 647                 }
 648                 cf.f_av_value = si->si_ctxcsn[maxid];
 649                 fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 650                         "(entryCSN>=%s)", cf.f_av_value.bv_val );
 651                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 652                         return LDAP_OTHER;
 653                 }
 654                 fop.ors_attrsonly = 0;
 655                 fop.ors_attrs = csn_anlist;
 656                 fop.ors_slimit = SLAP_NO_LIMIT;
 657                 cb.sc_private = &maxcsn;
 658                 cb.sc_response = findmax_cb;
 659                 strcpy( cbuf, cf.f_av_value.bv_val );
 660                 maxcsn.bv_val = cbuf;
 661                 maxcsn.bv_len = cf.f_av_value.bv_len;
 662                 break;
 663         case FIND_CSN:
 664                 if ( BER_BVISEMPTY( &cf.f_av_value )) {
 665                         cf.f_av_value = *csn;
 666                 }
 667                 fop.o_dn = op->o_bd->be_rootdn;
 668                 fop.o_ndn = op->o_bd->be_rootndn;
 669                 fop.o_req_dn = op->o_bd->be_suffix[0];
 670                 fop.o_req_ndn = op->o_bd->be_nsuffix[0];
 671                 /* Look for exact match the first time */
 672                 if ( findcsn_retry ) {
 673                         cf.f_choice = LDAP_FILTER_EQUALITY;
 674                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 675                                 "(entryCSN=%s)", cf.f_av_value.bv_val );
 676                 /* On retry, look for <= */
 677                 } else {
 678                         cf.f_choice = LDAP_FILTER_LE;
 679                         fop.ors_limit = &fc_limits;
 680                         memset( &fc_limits, 0, sizeof( fc_limits ));
 681                         fc_limits.lms_s_unchecked = 1;
 682                         fop.ors_filterstr.bv_len = snprintf( buf, sizeof( buf ),
 683                                 "(entryCSN<=%s)", cf.f_av_value.bv_val );
 684                 }
 685                 if ( fop.ors_filterstr.bv_len >= sizeof( buf ) ) {
 686                         return LDAP_OTHER;
 687                 }
 688                 fop.ors_attrsonly = 1;
 689                 fop.ors_attrs = slap_anlist_no_attrs;
 690                 fop.ors_slimit = 1;
 691                 cb.sc_private = NULL;
 692                 cb.sc_response = findcsn_cb;
 693                 break;
 694         case FIND_PRESENT:
 695                 fop.ors_filter = op->ors_filter;
 696                 fop.ors_filterstr = op->ors_filterstr;
 697                 fop.ors_attrsonly = 0;
 698                 fop.ors_attrs = uuid_anlist;
 699                 fop.ors_slimit = SLAP_NO_LIMIT;
 700                 cb.sc_private = &pcookie;
 701                 cb.sc_response = findpres_cb;
 702                 pcookie.num = 0;
 703
 704                 /* preallocate storage for a full set */
 705                 pcookie.uuids = op->o_tmpalloc( (SLAP_SYNCUUID_SET_SIZE+1) *
 706                         sizeof(struct berval) + SLAP_SYNCUUID_SET_SIZE * UUID_LEN,
 707                         op->o_tmpmemctx );
 708                 pcookie.last = (char *)(pcookie.uuids + SLAP_SYNCUUID_SET_SIZE+1);
 709                 pcookie.uuids[0].bv_val = pcookie.last;
 710                 pcookie.uuids[0].bv_len = UUID_LEN;
 711                 for (i=1; i<SLAP_SYNCUUID_SET_SIZE; i++) {
 712                         pcookie.uuids[i].bv_val = pcookie.uuids[i-1].bv_val + UUID_LEN;
 713                         pcookie.uuids[i].bv_len = UUID_LEN;
 714                 }
 715                 break;
 716         }
 717
 718         fop.o_bd->bd_info = (BackendInfo *)on->on_info;
 719         fop.o_bd->be_search( &fop, &frs );
 720         fop.o_bd->bd_info = (BackendInfo *)on;
 721
 722         switch( mode ) {
 723         case FIND_MAXCSN:
 724                 if ( ber_bvcmp( &si->si_ctxcsn[maxid], &maxcsn )) {
 725 #ifdef CHECK_CSN
 726                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
 727                         assert( !syn->ssyn_validate( syn, &maxcsn ));
 728 #endif
 729                         ber_bvreplace( &si->si_ctxcsn[maxid], &maxcsn );
 730                         si->si_numops++;        /* ensure a checkpoint */
 731                 }
 732                 break;
 733         case FIND_CSN:
 734                 /* If matching CSN was not found, invalidate the context. */
 735                 if ( !cb.sc_private ) {
 736                         /* If we didn't find an exact match, then try for <= */
 737                         if ( findcsn_retry ) {
 738                                 findcsn_retry = 0;
 739                                 rs_reinit( &frs, REP_RESULT );
 740                                 goto again;
 741                         }
 742                         rc = LDAP_NO_SUCH_OBJECT;
 743                 }
 744                 break;
 745         case FIND_PRESENT:
 746                 op->o_tmpfree( pcookie.uuids, op->o_tmpmemctx );
 747                 break;
 748         }
 749
 750         return rc;
 751 }
 752
 753 /* Should find a place to cache these */
 754 static mutexint *get_mutexint()
 755 {
 756         mutexint *mi = ch_malloc( sizeof( mutexint ));
 757         ldap_pvt_thread_mutex_init( &mi->mi_mutex );
 758         mi->mi_int = 1;
 759         return mi;
 760 }
 761
 762 static void inc_mutexint( mutexint *mi )
 763 {
 764         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 765         mi->mi_int++;
 766         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 767 }
 768
 769 /* return resulting counter */
 770 static int dec_mutexint( mutexint *mi )
 771 {
 772         int i;
 773         ldap_pvt_thread_mutex_lock( &mi->mi_mutex );
 774         i = --mi->mi_int;
 775         ldap_pvt_thread_mutex_unlock( &mi->mi_mutex );
 776         if ( !i ) {
 777                 ldap_pvt_thread_mutex_destroy( &mi->mi_mutex );
 778                 ch_free( mi );
 779         }
 780         return i;
 781 }
 782
 783 static void
 784 syncprov_free_syncop( syncops *so )
 785 {
 786         syncres *sr, *srnext;
 787         GroupAssertion *ga, *gnext;
 788
 789         ldap_pvt_thread_mutex_lock( &so->s_mutex );
 790         /* already being freed, or still in use */
 791         if ( !so->s_inuse || --so->s_inuse > 0 ) {
 792                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 793                 return;
 794         }
 795         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 796         if ( so->s_flags & PS_IS_DETACHED ) {
 797                 filter_free( so->s_op->ors_filter );
 798                 for ( ga = so->s_op->o_groups; ga; ga=gnext ) {
 799                         gnext = ga->ga_next;
 800                         ch_free( ga );
 801                 }
 802                 ch_free( so->s_op );
 803         }
 804         ch_free( so->s_base.bv_val );
 805         for ( sr=so->s_res; sr; sr=srnext ) {
 806                 srnext = sr->s_next;
 807                 if ( sr->s_e ) {
 808                         if ( !dec_mutexint( sr->s_e->e_private )) {
 809                                 sr->s_e->e_private = NULL;
 810                                 entry_free( sr->s_e );
 811                         }
 812                 }
 813                 ch_free( sr );
 814         }
 815         ldap_pvt_thread_mutex_destroy( &so->s_mutex );
 816         ch_free( so );
 817 }
 818
 819 /* Send a persistent search response */
 820 static int
 821 syncprov_sendresp( Operation *op, opcookie *opc, syncops *so, int mode )
 822 {
 823         SlapReply rs = { REP_SEARCH };
 824         LDAPControl *ctrls[2];
 825         struct berval cookie = BER_BVNULL, csns[2];
 826         Entry e_uuid = {0};
 827         Attribute a_uuid = {0};
 828
 829         if ( so->s_op->o_abandon )
 830                 return SLAPD_ABANDON;
 831
 832         ctrls[1] = NULL;
 833         if ( !BER_BVISNULL( &opc->sctxcsn )) {
 834                 csns[0] = opc->sctxcsn;
 835                 BER_BVZERO( &csns[1] );
 836                 slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 837         }
 838
 839 #ifdef LDAP_DEBUG
 840         if ( so->s_sid > 0 ) {
 841                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 842                         so->s_sid, cookie.bv_val ? cookie.bv_val : "", 0 );
 843         } else {
 844                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 845                         cookie.bv_val ? cookie.bv_val : "", 0, 0 );
 846         }
 847 #endif
 848
 849         e_uuid.e_attrs = &a_uuid;
 850         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 851         a_uuid.a_nvals = &opc->suuid;
 852         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 853                 mode, ctrls, 0, 1, &cookie );
 854         if ( !BER_BVISNULL( &cookie )) {
 855                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 856         }
 857
 858         rs.sr_ctrls = ctrls;
 859         rs.sr_entry = &e_uuid;
 860         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 861                 e_uuid = *opc->se;
 862                 e_uuid.e_private = NULL;
 863         }
 864
 865         switch( mode ) {
 866         case LDAP_SYNC_ADD:
 867                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 868                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 869                         rs.sr_err = send_search_reference( op, &rs );
 870                         ber_bvarray_free( rs.sr_ref );
 871                         break;
 872                 }
 873                 /* fallthru */
 874         case LDAP_SYNC_MODIFY:
 875                 rs.sr_attrs = op->ors_attrs;
 876                 rs.sr_err = send_search_entry( op, &rs );
 877                 break;
 878         case LDAP_SYNC_DELETE:
 879                 e_uuid.e_attrs = NULL;
 880                 e_uuid.e_name = opc->sdn;
 881                 e_uuid.e_nname = opc->sndn;
 882                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 883                         struct berval bv = BER_BVNULL;
 884                         rs.sr_ref = &bv;
 885                         rs.sr_err = send_search_reference( op, &rs );
 886                 } else {
 887                         rs.sr_err = send_search_entry( op, &rs );
 888                 }
 889                 break;
 890         default:
 891                 assert(0);
 892         }
 893         /* In case someone else freed it already? */
 894         if ( rs.sr_ctrls ) {
 895                 int i;
 896                 for ( i=0; rs.sr_ctrls[i]; i++ ) {
 897                         if ( rs.sr_ctrls[i] == ctrls[0] ) {
 898                                 op->o_tmpfree( ctrls[0]->ldctl_value.bv_val, op->o_tmpmemctx );
 899                                 ctrls[0]->ldctl_value.bv_val = NULL;
 900                                 break;
 901                         }
 902                 }
 903                 rs.sr_ctrls = NULL;
 904         }
 905
 906         return rs.sr_err;
 907 }
 908
 909 static void
 910 syncprov_qstart( syncops *so );
 911
 912 /* Play back queued responses */
 913 static int
 914 syncprov_qplay( Operation *op, syncops *so )
 915 {
 916         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 917         syncres *sr;
 918         opcookie opc;
 919         int rc = 0;
 920
 921         opc.son = on;
 922
 923         do {
 924                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 925                 sr = so->s_res;
 926                 if ( sr )
 927                         so->s_res = sr->s_next;
 928                 if ( !so->s_res )
 929                         so->s_restail = NULL;
 930                 /* Exit loop with mutex held */
 931                 if ( !sr || so->s_op->o_abandon )
 932                         break;
 933                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 934
 935                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 936                         SlapReply rs = { REP_INTERMEDIATE };
 937
 938                         rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 939                                 &sr->s_csn, 0, NULL, 0 );
 940                 } else {
 941                         opc.sdn = sr->s_dn;
 942                         opc.sndn = sr->s_ndn;
 943                         opc.suuid = sr->s_uuid;
 944                         opc.sctxcsn = sr->s_csn;
 945                         opc.sreference = sr->s_isreference;
 946                         opc.se = sr->s_e;
 947
 948                         rc = syncprov_sendresp( op, &opc, so, sr->s_mode );
 949
 950                 }
 951                 if ( sr->s_e ) {
 952                         if ( !dec_mutexint( sr->s_e->e_private )) {
 953                                 sr->s_e->e_private = NULL;
 954                                 entry_free ( sr->s_e );
 955                         }
 956                 }
 957
 958                 ch_free( sr );
 959
 960                 /* Exit loop with mutex held */
 961                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 962
 963         } while (0);
 964
 965         /* We now only send one change at a time, to prevent one
 966          * psearch from hogging all the CPU. Resubmit this task if
 967          * there are more responses queued and no errors occurred.
 968          */
 969
 970         if ( rc == 0 && so->s_res ) {
 971                 syncprov_qstart( so );
 972         } else {
 973                 so->s_flags ^= PS_TASK_QUEUED;
 974         }
 975
 976         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 977         return rc;
 978 }
 979
 980 /* task for playing back queued responses */
 981 static void *
 982 syncprov_qtask( void *ctx, void *arg )
 983 {
 984         syncops *so = arg;
 985         OperationBuffer opbuf;
 986         Operation *op;
 987         BackendDB be;
 988         int rc;
 989
 990         op = &opbuf.ob_op;
 991         *op = *so->s_op;
 992         op->o_hdr = &opbuf.ob_hdr;
 993         op->o_controls = opbuf.ob_controls;
 994         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 995         op->o_sync = SLAP_CONTROL_IGNORED;
 996
 997         *op->o_hdr = *so->s_op->o_hdr;
 998
 999         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
1000         op->o_tmpmfuncs = &slap_sl_mfuncs;
1001         op->o_threadctx = ctx;
1002
1003         /* syncprov_qplay expects a fake db */
1004         be = *so->s_op->o_bd;
1005         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1006         op->o_bd = &be;
1007         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1008         op->o_callback = NULL;
1009
1010         rc = syncprov_qplay( op, so );
1011
1012         /* decrement use count... */
1013         syncprov_free_syncop( so );
1014
1015         return NULL;
1016 }
1017
1018 /* Start the task to play back queued psearch responses */
1019 static void
1020 syncprov_qstart( syncops *so )
1021 {
1022         so->s_flags |= PS_TASK_QUEUED;
1023         so->s_inuse++;
1024         ldap_pvt_thread_pool_submit( &connection_pool,
1025                 syncprov_qtask, so );
1026 }
1027
1028 /* Queue a persistent search response */
1029 static int
1030 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1031 {
1032         syncres *sr;
1033         int srsize;
1034         struct berval cookie = opc->sctxcsn;
1035
1036         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1037                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1038
1039                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1040                         so->s_rid, slap_serverID ? slap_serverID : -1);
1041         }
1042
1043         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1044                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1045         if ( cookie.bv_len )
1046                 srsize += cookie.bv_len + 1;
1047         sr = ch_malloc( srsize );
1048         sr->s_next = NULL;
1049         sr->s_e = opc->se;
1050         /* bump refcount on this entry */
1051         if ( opc->se )
1052                 inc_mutexint( opc->se->e_private );
1053         sr->s_dn.bv_val = (char *)(sr + 1);
1054         sr->s_dn.bv_len = opc->sdn.bv_len;
1055         sr->s_mode = mode;
1056         sr->s_isreference = opc->sreference;
1057         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1058                  opc->sdn.bv_val ) + 1;
1059         sr->s_ndn.bv_len = opc->sndn.bv_len;
1060         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1061                  opc->sndn.bv_val ) + 1;
1062         sr->s_uuid.bv_len = opc->suuid.bv_len;
1063         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1064         if ( cookie.bv_len ) {
1065                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1066                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1067         } else {
1068                 sr->s_csn.bv_val = NULL;
1069         }
1070         sr->s_csn.bv_len = cookie.bv_len;
1071
1072         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1073                 ch_free( cookie.bv_val );
1074         }
1075
1076         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1077         if ( !so->s_res ) {
1078                 so->s_res = sr;
1079         } else {
1080                 so->s_restail->s_next = sr;
1081         }
1082         so->s_restail = sr;
1083
1084         /* If the base of the psearch was modified, check it next time round */
1085         if ( so->s_flags & PS_WROTE_BASE ) {
1086                 so->s_flags ^= PS_WROTE_BASE;
1087                 so->s_flags |= PS_FIND_BASE;
1088         }
1089         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1090                 syncprov_qstart( so );
1091         }
1092         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1093         return LDAP_SUCCESS;
1094 }
1095
1096 static int
1097 syncprov_drop_psearch( syncops *so, int lock )
1098 {
1099         if ( so->s_flags & PS_IS_DETACHED ) {
1100                 if ( lock )
1101                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1102                 so->s_op->o_conn->c_n_ops_executing--;
1103                 so->s_op->o_conn->c_n_ops_completed++;
1104                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1105                         o_next );
1106                 if ( lock )
1107                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1108         }
1109         syncprov_free_syncop( so );
1110
1111         return 0;
1112 }
1113
1114 static int
1115 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1116 {
1117         slap_callback *sc = op->o_callback;
1118         op->o_callback = sc->sc_next;
1119         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1120         op->o_tmpfree( sc, op->o_tmpmemctx );
1121         return 0;
1122 }
1123
1124 static int
1125 syncprov_op_abandon( Operation *op, SlapReply *rs )
1126 {
1127         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1128         syncprov_info_t         *si = on->on_bi.bi_private;
1129         syncops *so, *soprev;
1130
1131         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1132         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1133                 soprev=so, so=so->s_next ) {
1134                 if ( so->s_op->o_connid == op->o_connid &&
1135                         so->s_op->o_msgid == op->orn_msgid ) {
1136                                 so->s_op->o_abandon = 1;
1137                                 soprev->s_next = so->s_next;
1138                                 break;
1139                 }
1140         }
1141         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1142         if ( so ) {
1143                 /* Is this really a Cancel exop? */
1144                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1145                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1146                         rs->sr_err = LDAP_CANCELLED;
1147                         send_ldap_result( so->s_op, rs );
1148                         if ( so->s_flags & PS_IS_DETACHED ) {
1149                                 slap_callback *cb;
1150                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1151                                 cb->sc_cleanup = syncprov_ab_cleanup;
1152                                 cb->sc_next = op->o_callback;
1153                                 cb->sc_private = so;
1154                                 return SLAP_CB_CONTINUE;
1155                         }
1156                 }
1157                 syncprov_drop_psearch( so, 0 );
1158         }
1159         return SLAP_CB_CONTINUE;
1160 }
1161
1162 /* Find which persistent searches are affected by this operation */
1163 static void
1164 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1165 {
1166         slap_overinst *on = opc->son;
1167         syncprov_info_t         *si = on->on_bi.bi_private;
1168
1169         fbase_cookie fc;
1170         syncops *ss, *sprev, *snext;
1171         Entry *e = NULL;
1172         Attribute *a;
1173         int rc;
1174         struct berval newdn;
1175         int freefdn = 0;
1176         BackendDB *b0 = op->o_bd, db;
1177
1178         fc.fdn = &op->o_req_ndn;
1179         /* compute new DN */
1180         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1181                 struct berval pdn;
1182                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1183                 else dnParent( fc.fdn, &pdn );
1184                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1185                 fc.fdn = &newdn;
1186                 freefdn = 1;
1187         }
1188         if ( op->o_tag != LDAP_REQ_ADD ) {
1189                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1190                         db = *op->o_bd;
1191                         op->o_bd = &db;
1192                 }
1193                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1194                 /* If we're sending responses now, make a copy and unlock the DB */
1195                 if ( e && !saveit ) {
1196                         if ( !opc->se ) {
1197                                 opc->se = entry_dup( e );
1198                                 opc->se->e_private = get_mutexint();
1199                         }
1200                         overlay_entry_release_ov( op, e, 0, on );
1201                         e = opc->se;
1202                 }
1203                 if ( rc ) {
1204                         op->o_bd = b0;
1205                         return;
1206                 }
1207         } else {
1208                 e = op->ora_e;
1209                 if ( !saveit ) {
1210                         if ( !opc->se ) {
1211                                 opc->se = entry_dup( e );
1212                                 opc->se->e_private = get_mutexint();
1213                         }
1214                         e = opc->se;
1215                 }
1216         }
1217
1218         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1219                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1220                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1221                 opc->sreference = is_entry_referral( e );
1222                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1223                 if ( a )
1224                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1225         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1226                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1227                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1228                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1229                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1230         }
1231
1232         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1233         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1234                 sprev = ss, ss=snext)
1235         {
1236                 Operation op2;
1237                 Opheader oh;
1238                 syncmatches *sm;
1239                 int found = 0;
1240
1241                 snext = ss->s_next;
1242                 if ( ss->s_op->o_abandon )
1243                         continue;
1244
1245                 /* Don't send ops back to the originator */
1246                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1247                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1248                                 opc->osid, 0, 0 );
1249                         continue;
1250                 }
1251
1252                 /* Don't send ops back to the messenger */
1253                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1254                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1255                                 opc->rsid, 0, 0 );
1256                         continue;
1257                 }
1258
1259                 /* validate base */
1260                 fc.fss = ss;
1261                 fc.fbase = 0;
1262                 fc.fscope = 0;
1263
1264                 /* If the base of the search is missing, signal a refresh */
1265                 rc = syncprov_findbase( op, &fc );
1266                 if ( rc != LDAP_SUCCESS ) {
1267                         SlapReply rs = {REP_RESULT};
1268                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1269                                 "search base has changed" );
1270                         sprev->s_next = snext;
1271                         syncprov_drop_psearch( ss, 1 );
1272                         ss = sprev;
1273                         continue;
1274                 }
1275
1276                 /* If we're sending results now, look for this op in old matches */
1277                 if ( !saveit ) {
1278                         syncmatches *old;
1279
1280                         /* Did we modify the search base? */
1281                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1282                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1283                                 ss->s_flags |= PS_WROTE_BASE;
1284                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1285                         }
1286
1287                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1288                                 old=sm, sm=sm->sm_next ) {
1289                                 if ( sm->sm_op == ss ) {
1290                                         found = 1;
1291                                         old->sm_next = sm->sm_next;
1292                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1293                                         break;
1294                                 }
1295                         }
1296                 }
1297
1298                 if ( fc.fscope ) {
1299                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1300                         op2 = *ss->s_op;
1301                         oh = *op->o_hdr;
1302                         oh.oh_conn = ss->s_op->o_conn;
1303                         oh.oh_connid = ss->s_op->o_connid;
1304                         op2.o_bd = op->o_bd->bd_self;
1305                         op2.o_hdr = &oh;
1306                         op2.o_extra = op->o_extra;
1307                         op2.o_callback = NULL;
1308                         if (ss->s_flags & PS_FIX_FILTER) {
1309                                 /* Skip the AND/GE clause that we stuck on in front. We
1310                                    would lose deletes/mods that happen during the refresh
1311                                    phase otherwise (ITS#6555) */
1312                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1313                         }
1314                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1315                         rc = test_filter( &op2, e, op2.ors_filter );
1316                 }
1317
1318                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1319                         ss->s_sid, fc.fscope, rc );
1320
1321                 /* check if current o_req_dn is in scope and matches filter */
1322                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1323                         if ( saveit ) {
1324                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1325                                 sm->sm_next = opc->smatches;
1326                                 sm->sm_op = ss;
1327                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1328                                 ++ss->s_inuse;
1329                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1330                                 opc->smatches = sm;
1331                         } else {
1332                                 /* if found send UPDATE else send ADD */
1333                                 syncprov_qresp( opc, ss,
1334                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1335                         }
1336                 } else if ( !saveit && found ) {
1337                         /* send DELETE */
1338                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1339                 } else if ( !saveit ) {
1340                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1341                 }
1342                 if ( !saveit && found ) {
1343                         /* Decrement s_inuse, was incremented when called
1344                          * with saveit == TRUE
1345                          */
1346                         syncprov_free_syncop( ss );
1347                 }
1348         }
1349         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1350
1351         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1352                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1353                         op->o_bd = &db;
1354                 }
1355                 if ( saveit )
1356                         overlay_entry_release_ov( op, e, 0, on );
1357                 op->o_bd = b0;
1358         }
1359         if ( opc->se && !saveit ) {
1360                 if ( !dec_mutexint( opc->se->e_private )) {
1361                         opc->se->e_private = NULL;
1362                         entry_free( opc->se );
1363                         opc->se = NULL;
1364                 }
1365         }
1366         if ( freefdn ) {
1367                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1368         }
1369         op->o_bd = b0;
1370 }
1371
1372 static int
1373 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1374 {
1375         slap_callback *cb = op->o_callback;
1376         opcookie *opc = cb->sc_private;
1377         slap_overinst *on = opc->son;
1378         syncprov_info_t         *si = on->on_bi.bi_private;
1379         syncmatches *sm, *snext;
1380         modtarget *mt;
1381
1382         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1383         if ( si->si_active )
1384                 si->si_active--;
1385         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1386
1387         for (sm = opc->smatches; sm; sm=snext) {
1388                 snext = sm->sm_next;
1389                 syncprov_free_syncop( sm->sm_op );
1390                 op->o_tmpfree( sm, op->o_tmpmemctx );
1391         }
1392
1393         /* Remove op from lock table */
1394         mt = opc->smt;
1395         if ( mt ) {
1396                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1397                 mt->mt_mods = mt->mt_mods->mi_next;
1398                 /* If there are more, promote the next one */
1399                 if ( mt->mt_mods ) {
1400                         mt->mt_op = mt->mt_mods->mi_op;
1401                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1402                 } else {
1403                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1404                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1405                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1406                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1407                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1408                         ch_free( mt );
1409                 }
1410         }
1411         if ( !BER_BVISNULL( &opc->suuid ))
1412                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1413         if ( !BER_BVISNULL( &opc->sndn ))
1414                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1415         if ( !BER_BVISNULL( &opc->sdn ))
1416                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1417         op->o_callback = cb->sc_next;
1418         op->o_tmpfree(cb, op->o_tmpmemctx);
1419
1420         return 0;
1421 }
1422
1423 static void
1424 syncprov_checkpoint( Operation *op, slap_overinst *on )
1425 {
1426         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1427         Modifications mod;
1428         Operation opm;
1429         SlapReply rsm = {REP_RESULT};
1430         slap_callback cb = {0};
1431         BackendDB be;
1432         BackendInfo *bi;
1433
1434 #ifdef CHECK_CSN
1435         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1436
1437         int i;
1438         for ( i=0; i<si->si_numcsns; i++ ) {
1439                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1440         }
1441 #endif
1442         mod.sml_numvals = si->si_numcsns;
1443         mod.sml_values = si->si_ctxcsn;
1444         mod.sml_nvalues = NULL;
1445         mod.sml_desc = slap_schema.si_ad_contextCSN;
1446         mod.sml_op = LDAP_MOD_REPLACE;
1447         mod.sml_flags = SLAP_MOD_INTERNAL;
1448         mod.sml_next = NULL;
1449
1450         cb.sc_response = slap_null_cb;
1451         opm = *op;
1452         opm.o_tag = LDAP_REQ_MODIFY;
1453         opm.o_callback = &cb;
1454         opm.orm_modlist = &mod;
1455         opm.orm_no_opattrs = 1;
1456         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1457                 be = *on->on_info->oi_origdb;
1458                 opm.o_bd = &be;
1459         }
1460         opm.o_req_dn = si->si_contextdn;
1461         opm.o_req_ndn = si->si_contextdn;
1462         bi = opm.o_bd->bd_info;
1463         opm.o_bd->bd_info = on->on_info->oi_orig;
1464         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1465         opm.o_no_schema_check = 1;
1466         opm.o_bd->be_modify( &opm, &rsm );
1467
1468         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1469                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1470                 const char      *text;
1471                 char txtbuf[SLAP_TEXT_BUFLEN];
1472                 size_t textlen = sizeof txtbuf;
1473                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1474                 rs_reinit( &rsm, REP_RESULT );
1475                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1476                 opm.ora_e = e;
1477                 opm.o_bd->be_add( &opm, &rsm );
1478                 if ( e == opm.ora_e )
1479                         be_entry_release_w( &opm, opm.ora_e );
1480         }
1481         opm.o_bd->bd_info = bi;
1482
1483         if ( mod.sml_next != NULL ) {
1484                 slap_mods_free( mod.sml_next, 1 );
1485         }
1486 #ifdef CHECK_CSN
1487         for ( i=0; i<si->si_numcsns; i++ ) {
1488                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1489         }
1490 #endif
1491 }
1492
1493 static void
1494 syncprov_add_slog( Operation *op )
1495 {
1496         opcookie *opc = op->o_callback->sc_private;
1497         slap_overinst *on = opc->son;
1498         syncprov_info_t         *si = on->on_bi.bi_private;
1499         sessionlog *sl;
1500         slog_entry *se;
1501
1502         sl = si->si_logs;
1503         {
1504                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1505                         /* During the syncrepl refresh phase we can receive operations
1506                          * without a csn.  We cannot reliably determine the consumers
1507                          * state with respect to such operations, so we ignore them and
1508                          * wipe out anything in the log if we see them.
1509                          */
1510                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1511                         while ( se = sl->sl_head ) {
1512                                 sl->sl_head = se->se_next;
1513                                 ch_free( se );
1514                         }
1515                         sl->sl_tail = NULL;
1516                         sl->sl_num = 0;
1517                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1518                         return;
1519                 }
1520
1521                 /* Allocate a record. UUIDs are not NUL-terminated. */
1522                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1523                         op->o_csn.bv_len + 1 );
1524                 se->se_next = NULL;
1525                 se->se_tag = op->o_tag;
1526
1527                 se->se_uuid.bv_val = (char *)(&se[1]);
1528                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1529                 se->se_uuid.bv_len = opc->suuid.bv_len;
1530
1531                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1532                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1533                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1534                 se->se_csn.bv_len = op->o_csn.bv_len;
1535                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1536
1537                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1538                 if ( sl->sl_head ) {
1539                         /* Keep the list in csn order. */
1540                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1541                                 sl->sl_tail->se_next = se;
1542                                 sl->sl_tail = se;
1543                         } else {
1544                                 slog_entry **sep;
1545
1546                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1547                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1548                                                 se->se_next = *sep;
1549                                                 *sep = se;
1550                                                 break;
1551                                         }
1552                                 }
1553                         }
1554                 } else {
1555                         sl->sl_head = se;
1556                         sl->sl_tail = se;
1557                         if ( !sl->sl_mincsn ) {
1558                                 sl->sl_numcsns = 1;
1559                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1560                                 sl->sl_sids = ch_malloc( sizeof( int ));
1561                                 sl->sl_sids[0] = se->se_sid;
1562                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1563                                 BER_BVZERO( &sl->sl_mincsn[1] );
1564                         }
1565                 }
1566                 sl->sl_num++;
1567                 while ( sl->sl_num > sl->sl_size ) {
1568                         int i, j;
1569                         se = sl->sl_head;
1570                         sl->sl_head = se->se_next;
1571                         for ( i=0; i<sl->sl_numcsns; i++ )
1572                                 if ( sl->sl_sids[i] >= se->se_sid )
1573                                         break;
1574                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1575                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1576                                         i, se->se_sid, &se->se_csn );
1577                         } else {
1578                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1579                         }
1580                         ch_free( se );
1581                         sl->sl_num--;
1582                 }
1583                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1584         }
1585 }
1586
1587 /* Just set a flag if we found the matching entry */
1588 static int
1589 playlog_cb( Operation *op, SlapReply *rs )
1590 {
1591         if ( rs->sr_type == REP_SEARCH ) {
1592                 op->o_callback->sc_private = (void *)1;
1593         }
1594         return rs->sr_err;
1595 }
1596
1597 /* enter with sl->sl_mutex locked, release before returning */
1598 static void
1599 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1600         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1601 {
1602         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1603         slog_entry *se;
1604         int i, j, ndel, num, nmods, mmods;
1605         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1606         BerVarray uuids;
1607         struct berval delcsn[2];
1608
1609         if ( !sl->sl_num ) {
1610                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1611                 return;
1612         }
1613
1614         num = sl->sl_num;
1615         i = 0;
1616         nmods = 0;
1617
1618         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1619                 num * UUID_LEN, op->o_tmpmemctx );
1620         uuids[0].bv_val = (char *)(uuids + num + 1);
1621
1622         delcsn[0].bv_len = 0;
1623         delcsn[0].bv_val = cbuf;
1624         BER_BVZERO(&delcsn[1]);
1625
1626         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1627          * and everything else at the end. Do this first so we can
1628          * unlock the list mutex.
1629          */
1630         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1631                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1632         for ( se=sl->sl_head; se; se=se->se_next ) {
1633                 int k;
1634                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1635                 ndel = 1;
1636                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1637                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1638                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1639                                 break;
1640                         }
1641                 }
1642                 if ( ndel <= 0 ) {
1643                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1644                         continue;
1645                 }
1646                 ndel = 0;
1647                 for ( k=0; k<numcsns; k++ ) {
1648                         if ( se->se_sid == sids[k] ) {
1649                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1650                                 break;
1651                         }
1652                 }
1653                 if ( ndel > 0 ) {
1654                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1655                         break;
1656                 }
1657                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1658                         j = i;
1659                         i++;
1660                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1661                         delcsn[0].bv_len = se->se_csn.bv_len;
1662                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1663                 } else {
1664                         if ( se->se_tag == LDAP_REQ_ADD )
1665                                 continue;
1666                         nmods++;
1667                         j = num - nmods;
1668                 }
1669                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1670                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1671                 uuids[j].bv_len = UUID_LEN;
1672         }
1673         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1674
1675         ndel = i;
1676
1677         /* Zero out unused slots */
1678         for ( i=ndel; i < num - nmods; i++ )
1679                 uuids[i].bv_len = 0;
1680
1681         /* Mods must be validated to see if they belong in this delete set.
1682          */
1683
1684         mmods = nmods;
1685         /* Strip any duplicates */
1686         for ( i=0; i<nmods; i++ ) {
1687                 for ( j=0; j<ndel; j++ ) {
1688                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1689                                 uuids[num - 1 - i].bv_len = 0;
1690                                 mmods --;
1691                                 break;
1692                         }
1693                 }
1694                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1695                 for ( j=0; j<i; j++ ) {
1696                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1697                                 uuids[num - 1 - i].bv_len = 0;
1698                                 mmods --;
1699                                 break;
1700                         }
1701                 }
1702         }
1703
1704         if ( mmods ) {
1705                 Operation fop;
1706                 int rc;
1707                 Filter mf, af;
1708                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1709                 slap_callback cb = {0};
1710
1711                 fop = *op;
1712
1713                 fop.o_sync_mode = 0;
1714                 fop.o_callback = &cb;
1715                 fop.ors_limit = NULL;
1716                 fop.ors_tlimit = SLAP_NO_LIMIT;
1717                 fop.ors_attrs = slap_anlist_all_attributes;
1718                 fop.ors_attrsonly = 0;
1719                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1720
1721                 af.f_choice = LDAP_FILTER_AND;
1722                 af.f_next = NULL;
1723                 af.f_and = &mf;
1724                 mf.f_choice = LDAP_FILTER_EQUALITY;
1725                 mf.f_ava = &eq;
1726                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1727                 mf.f_next = fop.ors_filter;
1728
1729                 fop.ors_filter = &af;
1730
1731                 cb.sc_response = playlog_cb;
1732                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1733
1734                 for ( i=ndel; i<num; i++ ) {
1735                   if ( uuids[i].bv_len != 0 ) {
1736                         SlapReply frs = { REP_RESULT };
1737
1738                         mf.f_av_value = uuids[i];
1739                         cb.sc_private = NULL;
1740                         fop.ors_slimit = 1;
1741                         rc = fop.o_bd->be_search( &fop, &frs );
1742
1743                         /* If entry was not found, add to delete list */
1744                         if ( !cb.sc_private ) {
1745                                 uuids[ndel++] = uuids[i];
1746                         }
1747                   }
1748                 }
1749                 fop.o_bd->bd_info = (BackendInfo *)on;
1750         }
1751         if ( ndel ) {
1752                 struct berval cookie;
1753
1754                 if ( delcsn[0].bv_len ) {
1755                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1756                                 slap_serverID ? slap_serverID : -1 );
1757
1758                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1759                 }
1760
1761                 uuids[ndel].bv_val = NULL;
1762                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1763                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1764                 if ( delcsn[0].bv_len ) {
1765                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1766                 }
1767         }
1768         op->o_tmpfree( uuids, op->o_tmpmemctx );
1769 }
1770
1771 static int
1772 syncprov_op_response( Operation *op, SlapReply *rs )
1773 {
1774         opcookie *opc = op->o_callback->sc_private;
1775         slap_overinst *on = opc->son;
1776         syncprov_info_t         *si = on->on_bi.bi_private;
1777         syncmatches *sm;
1778
1779         if ( rs->sr_err == LDAP_SUCCESS )
1780         {
1781                 struct berval maxcsn;
1782                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1783                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1784
1785                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1786
1787                 /* Update our context CSN */
1788                 cbuf[0] = '\0';
1789                 maxcsn.bv_val = cbuf;
1790                 maxcsn.bv_len = sizeof(cbuf);
1791                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1792
1793                 slap_get_commit_csn( op, &maxcsn, &foundit );
1794                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1795                         /* syncrepl queues the CSN values in the db where
1796                          * it is configured , not where the changes are made.
1797                          * So look for a value in the glue db if we didn't
1798                          * find any in this db.
1799                          */
1800                         BackendDB *be = op->o_bd;
1801                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1802                         maxcsn.bv_val = cbuf;
1803                         maxcsn.bv_len = sizeof(cbuf);
1804                         slap_get_commit_csn( op, &maxcsn, &foundit );
1805                         op->o_bd = be;
1806                 }
1807                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1808                         int i, sid;
1809 #ifdef CHECK_CSN
1810                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1811                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1812 #endif
1813                         sid = slap_parse_csn_sid( &maxcsn );
1814                         for ( i=0; i<si->si_numcsns; i++ ) {
1815                                 if ( sid < si->si_sids[i] )
1816                                         break;
1817                                 if ( sid == si->si_sids[i] ) {
1818                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1819                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1820                                                 csn_changed = 1;
1821                                         }
1822                                         break;
1823                                 }
1824                         }
1825                         /* It's a new SID for us */
1826                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1827                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1828                                         i, sid, &maxcsn );
1829                                 csn_changed = 1;
1830                         }
1831                 }
1832
1833                 /* Don't do any processing for consumer contextCSN updates */
1834                 if ( op->o_dont_replicate ) {
1835                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1836                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1837                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1838                         /* Catch contextCSN updates from syncrepl. We have to look at
1839                          * all the attribute values, as there may be more than one csn
1840                          * that changed, and only one can be passed in the csn queue.
1841                          */
1842                         Modifications *mod = op->orm_modlist;
1843                         unsigned i;
1844                         int j, sid;
1845
1846                         for ( i=0; i<mod->sml_numvals; i++ ) {
1847                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1848                                 for ( j=0; j<si->si_numcsns; j++ ) {
1849                                         if ( sid < si->si_sids[j] )
1850                                                 break;
1851                                         if ( sid == si->si_sids[j] ) {
1852                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1853                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1854                                                         csn_changed = 1;
1855                                                 }
1856                                                 break;
1857                                         }
1858                                 }
1859
1860                                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1861                                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1862                                                 j, sid, &mod->sml_values[i] );
1863                                         csn_changed = 1;
1864                                 }
1865                         }
1866                         if ( csn_changed )
1867                                 si->si_dirty = 0;
1868                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1869
1870                         if ( csn_changed ) {
1871                                 syncops *ss;
1872                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1873                                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1874                                         if ( ss->s_op->o_abandon )
1875                                                 continue;
1876                                         /* Send the updated csn to all syncrepl consumers,
1877                                          * including the server from which it originated.
1878                                          * The syncrepl consumer and syncprov provider on
1879                                          * the originating server may be configured to store
1880                                          * their csn values in different entries.
1881                                          */
1882                                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1883                                 }
1884                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1885                         }
1886                         } else {
1887                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1888                         }
1889                         goto leave;
1890                 }
1891
1892                 si->si_numops++;
1893                 if ( si->si_chkops || si->si_chktime ) {
1894                         /* Never checkpoint adding the context entry,
1895                          * it will deadlock
1896                          */
1897                         if ( op->o_tag != LDAP_REQ_ADD ||
1898                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1899                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1900                                         do_check = 1;
1901                                         si->si_numops = 0;
1902                                 }
1903                                 if ( si->si_chktime &&
1904                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1905                                         if ( si->si_chklast ) {
1906                                                 do_check = 1;
1907                                                 si->si_chklast = op->o_time;
1908                                         } else {
1909                                                 si->si_chklast = 1;
1910                                         }
1911                                 }
1912                         }
1913                 }
1914                 si->si_dirty = !csn_changed;
1915                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1916
1917                 if ( do_check ) {
1918                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1919                         syncprov_checkpoint( op, on );
1920                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1921                 }
1922
1923                 /* only update consumer ctx if this is a newer csn */
1924                 if ( csn_changed ) {
1925                         opc->sctxcsn = maxcsn;
1926                 }
1927
1928                 /* Handle any persistent searches */
1929                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1930                 have_psearches = ( si->si_ops != NULL );
1931                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1932                 if ( have_psearches ) {
1933                         switch(op->o_tag) {
1934                         case LDAP_REQ_ADD:
1935                         case LDAP_REQ_MODIFY:
1936                         case LDAP_REQ_MODRDN:
1937                         case LDAP_REQ_EXTENDED:
1938                                 syncprov_matchops( op, opc, 0 );
1939                                 break;
1940                         case LDAP_REQ_DELETE:
1941                                 /* for each match in opc->smatches:
1942                                  *   send DELETE msg
1943                                  */
1944                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1945                                         if ( sm->sm_op->s_op->o_abandon )
1946                                                 continue;
1947                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1948                                 }
1949                                 break;
1950                         }
1951                 }
1952
1953                 /* Add any log records */
1954                 if ( si->si_logs ) {
1955                         syncprov_add_slog( op );
1956                 }
1957 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1958         }
1959         return SLAP_CB_CONTINUE;
1960 }
1961
1962 /* We don't use a subentry to store the context CSN any more.
1963  * We expose the current context CSN as an operational attribute
1964  * of the suffix entry.
1965  */
1966 static int
1967 syncprov_op_compare( Operation *op, SlapReply *rs )
1968 {
1969         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1970         syncprov_info_t         *si = on->on_bi.bi_private;
1971         int rc = SLAP_CB_CONTINUE;
1972
1973         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1974                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1975         {
1976                 Entry e = {0};
1977                 Attribute a = {0};
1978
1979                 e.e_name = si->si_contextdn;
1980                 e.e_nname = si->si_contextdn;
1981                 e.e_attrs = &a;
1982
1983                 a.a_desc = slap_schema.si_ad_contextCSN;
1984
1985                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1986
1987                 a.a_vals = si->si_ctxcsn;
1988                 a.a_nvals = a.a_vals;
1989                 a.a_numvals = si->si_numcsns;
1990
1991                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1992                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1993                 if ( ! rs->sr_err ) {
1994                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1995                         goto return_results;
1996                 }
1997
1998                 if ( get_assert( op ) &&
1999                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
2000                 {
2001                         rs->sr_err = LDAP_ASSERTION_FAILED;
2002                         goto return_results;
2003                 }
2004
2005
2006                 rs->sr_err = LDAP_COMPARE_FALSE;
2007
2008                 if ( attr_valfind( &a,
2009                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2010                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2011                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2012                 {
2013                         rs->sr_err = LDAP_COMPARE_TRUE;
2014                 }
2015
2016 return_results:;
2017
2018                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2019
2020                 send_ldap_result( op, rs );
2021
2022                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2023                         rs->sr_err = LDAP_SUCCESS;
2024                 }
2025                 rc = rs->sr_err;
2026         }
2027
2028         return rc;
2029 }
2030
2031 static int
2032 syncprov_op_mod( Operation *op, SlapReply *rs )
2033 {
2034         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2035         syncprov_info_t         *si = on->on_bi.bi_private;
2036         slap_callback *cb;
2037         opcookie *opc;
2038         int have_psearches, cbsize;
2039
2040         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2041         have_psearches = ( si->si_ops != NULL );
2042         si->si_active++;
2043         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2044
2045         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2046                 (have_psearches ? sizeof(modinst) : 0 );
2047
2048         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2049         opc = (opcookie *)(cb+1);
2050         opc->son = on;
2051         cb->sc_response = syncprov_op_response;
2052         cb->sc_cleanup = syncprov_op_cleanup;
2053         cb->sc_private = opc;
2054         cb->sc_next = op->o_callback;
2055         op->o_callback = cb;
2056
2057         opc->osid = -1;
2058         opc->rsid = -1;
2059         if ( op->o_csn.bv_val ) {
2060                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2061         }
2062         if ( op->o_controls ) {
2063                 struct sync_cookie *scook =
2064                 op->o_controls[slap_cids.sc_LDAPsync];
2065                 if ( scook )
2066                         opc->rsid = scook->sid;
2067         }
2068
2069         if ( op->o_dont_replicate )
2070                 return SLAP_CB_CONTINUE;
2071
2072         /* If there are active persistent searches, lock this operation.
2073          * See seqmod.c for the locking logic on its own.
2074          */
2075         if ( have_psearches ) {
2076                 modtarget *mt, mtdummy;
2077                 modinst *mi;
2078
2079                 mi = (modinst *)(opc+1);
2080                 mi->mi_op = op;
2081
2082                 /* See if we're already modifying this entry... */
2083                 mtdummy.mt_op = op;
2084                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2085                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2086                 if ( mt ) {
2087                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2088                         if ( mt->mt_mods == NULL ) {
2089                                 /* Cannot reuse this mt, as another thread is about
2090                                  * to release it in syncprov_op_cleanup.
2091                                  */
2092                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2093                                 mt = NULL;
2094                         }
2095                 }
2096                 if ( mt ) {
2097                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2098                         mt->mt_tail->mi_next = mi;
2099                         mt->mt_tail = mi;
2100                         /* wait for this op to get to head of list */
2101                         while ( mt->mt_mods != mi ) {
2102                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2103                                 /* FIXME: if dynamic config can delete overlays or
2104                                  * databases we'll have to check for cleanup here.
2105                                  * Currently it's not an issue because there are
2106                                  * no dynamic config deletes...
2107                                  */
2108                                 if ( slapd_shutdown )
2109                                         return SLAPD_ABANDON;
2110
2111                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2112                                         ldap_pvt_thread_yield();
2113                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2114
2115                                 /* clean up if the caller is giving up */
2116                                 if ( op->o_abandon ) {
2117                                         modinst *m2;
2118                                         for ( m2 = mt->mt_mods; m2->mi_next != mi;
2119                                                 m2 = m2->mi_next );
2120                                         m2->mi_next = mi->mi_next;
2121                                         if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2122                                         op->o_tmpfree( cb, op->o_tmpmemctx );
2123                                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2124                                         return SLAPD_ABANDON;
2125                                 }
2126                         }
2127                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2128                 } else {
2129                         /* Record that we're modifying this entry now */
2130                         mt = ch_malloc( sizeof(modtarget) );
2131                         mt->mt_mods = mi;
2132                         mt->mt_tail = mi;
2133                         mt->mt_op = mi->mi_op;
2134                         ldap_pvt_thread_mutex_init( &mt->mt_mutex );
2135                         avl_insert( &si->si_mods, mt, sp_avl_cmp, avl_dup_error );
2136                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2137                 }
2138                 opc->smt = mt;
2139         }
2140
2141         if (( have_psearches || si->si_logs ) && op->o_tag != LDAP_REQ_ADD )
2142                 syncprov_matchops( op, opc, 1 );
2143
2144         return SLAP_CB_CONTINUE;
2145 }
2146
2147 static int
2148 syncprov_op_extended( Operation *op, SlapReply *rs )
2149 {
2150         if ( exop_is_write( op ))
2151                 return syncprov_op_mod( op, rs );
2152
2153         return SLAP_CB_CONTINUE;
2154 }
2155
2156 typedef struct searchstate {
2157         slap_overinst *ss_on;
2158         syncops *ss_so;
2159         BerVarray ss_ctxcsn;
2160         int *ss_sids;
2161         int ss_numcsns;
2162 #define SS_PRESENT      0x01
2163 #define SS_CHANGED      0x02
2164         int ss_flags;
2165 } searchstate;
2166
2167 static int
2168 syncprov_search_cleanup( Operation *op, SlapReply *rs )
2169 {
2170         if ( rs->sr_ctrls ) {
2171                 op->o_tmpfree( rs->sr_ctrls[0], op->o_tmpmemctx );
2172                 op->o_tmpfree( rs->sr_ctrls, op->o_tmpmemctx );
2173                 rs->sr_ctrls = NULL;
2174         }
2175         return 0;
2176 }
2177
2178 typedef struct SyncOperationBuffer {
2179         Operation               sob_op;
2180         Opheader                sob_hdr;
2181         OpExtra                 sob_oe;
2182         AttributeName   sob_extra;      /* not always present */
2183         /* Further data allocated here */
2184 } SyncOperationBuffer;
2185
2186 static void
2187 syncprov_detach_op( Operation *op, syncops *so, slap_overinst *on )
2188 {
2189         SyncOperationBuffer *sopbuf2;
2190         Operation *op2;
2191         int i, alen = 0;
2192         size_t size;
2193         char *ptr;
2194         GroupAssertion *g1, *g2;
2195
2196         /* count the search attrs */
2197         for (i=0; op->ors_attrs && !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2198                 alen += op->ors_attrs[i].an_name.bv_len + 1;
2199         }
2200         /* Make a new copy of the operation */
2201         size = offsetof( SyncOperationBuffer, sob_extra ) +
2202                 (i ? ( (i+1) * sizeof(AttributeName) + alen) : 0) +
2203                 op->o_req_dn.bv_len + 1 +
2204                 op->o_req_ndn.bv_len + 1 +
2205                 op->o_ndn.bv_len + 1 +
2206                 so->s_filterstr.bv_len + 1;
2207         sopbuf2 = ch_calloc( 1, size );
2208         op2 = &sopbuf2->sob_op;
2209         op2->o_hdr = &sopbuf2->sob_hdr;
2210         LDAP_SLIST_FIRST(&op2->o_extra) = &sopbuf2->sob_oe;
2211
2212         /* Copy the fields we care about explicitly, leave the rest alone */
2213         *op2->o_hdr = *op->o_hdr;
2214         op2->o_tag = op->o_tag;
2215         op2->o_time = op->o_time;
2216         op2->o_bd = on->on_info->oi_origdb;
2217         op2->o_request = op->o_request;
2218         op2->o_managedsait = op->o_managedsait;
2219         LDAP_SLIST_FIRST(&op2->o_extra)->oe_key = on;
2220         LDAP_SLIST_NEXT(LDAP_SLIST_FIRST(&op2->o_extra), oe_next) = NULL;
2221
2222         ptr = (char *) sopbuf2 + offsetof( SyncOperationBuffer, sob_extra );
2223         if ( i ) {
2224                 op2->ors_attrs = (AttributeName *) ptr;
2225                 ptr = (char *) &op2->ors_attrs[i+1];
2226                 for (i=0; !BER_BVISNULL( &op->ors_attrs[i].an_name ); i++) {
2227                         op2->ors_attrs[i] = op->ors_attrs[i];
2228                         op2->ors_attrs[i].an_name.bv_val = ptr;
2229                         ptr = lutil_strcopy( ptr, op->ors_attrs[i].an_name.bv_val ) + 1;
2230                 }
2231                 BER_BVZERO( &op2->ors_attrs[i].an_name );
2232         }
2233
2234         op2->o_authz = op->o_authz;
2235         op2->o_ndn.bv_val = ptr;
2236         ptr = lutil_strcopy(ptr, op->o_ndn.bv_val) + 1;
2237         op2->o_dn = op2->o_ndn;
2238         op2->o_req_dn.bv_len = op->o_req_dn.bv_len;
2239         op2->o_req_dn.bv_val = ptr;
2240         ptr = lutil_strcopy(ptr, op->o_req_dn.bv_val) + 1;
2241         op2->o_req_ndn.bv_len = op->o_req_ndn.bv_len;
2242         op2->o_req_ndn.bv_val = ptr;
2243         ptr = lutil_strcopy(ptr, op->o_req_ndn.bv_val) + 1;
2244         op2->ors_filterstr.bv_val = ptr;
2245         strcpy( ptr, so->s_filterstr.bv_val );
2246         op2->ors_filterstr.bv_len = so->s_filterstr.bv_len;
2247
2248         /* Skip the AND/GE clause that we stuck on in front */
2249         if ( so->s_flags & PS_FIX_FILTER ) {
2250                 op2->ors_filter = op->ors_filter->f_and->f_next;
2251                 so->s_flags ^= PS_FIX_FILTER;
2252         } else {
2253                 op2->ors_filter = op->ors_filter;
2254         }
2255         op2->ors_filter = filter_dup( op2->ors_filter, NULL );
2256         so->s_op = op2;
2257
2258         /* Copy any cached group ACLs individually */
2259         op2->o_groups = NULL;
2260         for ( g1=op->o_groups; g1; g1=g1->ga_next ) {
2261                 g2 = ch_malloc( sizeof(GroupAssertion) + g1->ga_len );
2262                 *g2 = *g1;
2263                 strcpy( g2->ga_ndn, g1->ga_ndn );
2264                 g2->ga_next = op2->o_groups;
2265                 op2->o_groups = g2;
2266         }
2267         /* Don't allow any further group caching */
2268         op2->o_do_not_cache = 1;
2269
2270         /* Add op2 to conn so abandon will find us */
2271         op->o_conn->c_n_ops_executing++;
2272         op->o_conn->c_n_ops_completed--;
2273         LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op2, o_next );
2274         so->s_flags |= PS_IS_DETACHED;
2275
2276         /* Prevent anyone else from trying to send a result for this op */
2277         op->o_abandon = 1;
2278 }
2279
2280 static int
2281 syncprov_search_response( Operation *op, SlapReply *rs )
2282 {
2283         searchstate *ss = op->o_callback->sc_private;
2284         slap_overinst *on = ss->ss_on;
2285         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
2286         sync_control *srs = op->o_controls[slap_cids.sc_LDAPsync];
2287
2288         if ( rs->sr_type == REP_SEARCH || rs->sr_type == REP_SEARCHREF ) {
2289                 Attribute *a;
2290                 /* If we got a referral without a referral object, there's
2291                  * something missing that we cannot replicate. Just ignore it.
2292                  * The consumer will abort because we didn't send the expected
2293                  * control.
2294                  */
2295                 if ( !rs->sr_entry ) {
2296                         assert( rs->sr_entry != NULL );
2297                         Debug( LDAP_DEBUG_ANY, "bogus referral in context\n",0,0,0 );
2298                         return SLAP_CB_CONTINUE;
2299                 }
2300                 a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryCSN );
2301                 if ( a == NULL && rs->sr_operational_attrs != NULL ) {
2302                         a = attr_find( rs->sr_operational_attrs, slap_schema.si_ad_entryCSN );
2303                 }
2304                 if ( a ) {
2305                         int i, sid;
2306                         sid = slap_parse_csn_sid( &a->a_nvals[0] );
2307
2308                         /* Don't send changed entries back to the originator */
2309                         if ( sid == srs->sr_state.sid && srs->sr_state.numcsns ) {
2310                                 Debug( LDAP_DEBUG_SYNC,
2311                                         "Entry %s changed by peer, ignored\n",
2312                                         rs->sr_entry->e_name.bv_val, 0, 0 );
2313                                 return LDAP_SUCCESS;
2314                         }
2315
2316                         /* If not a persistent search */
2317                         if ( !ss->ss_so ) {
2318                                 /* Make sure entry is less than the snapshot'd contextCSN */
2319                                 for ( i=0; i<ss->ss_numcsns; i++ ) {
2320                                         if ( sid == ss->ss_sids[i] && ber_bvcmp( &a->a_nvals[0],
2321                                                 &ss->ss_ctxcsn[i] ) > 0 ) {
2322                                                 Debug( LDAP_DEBUG_SYNC,
2323                                                         "Entry %s CSN %s greater than snapshot %s\n",
2324                                                         rs->sr_entry->e_name.bv_val,
2325                                                         a->a_nvals[0].bv_val,
2326                                                         ss->ss_ctxcsn[i].bv_val );
2327                                                 return LDAP_SUCCESS;
2328                                         }
2329                                 }
2330                         }
2331
2332                         /* Don't send old entries twice */
2333                         if ( srs->sr_state.ctxcsn ) {
2334                                 for ( i=0; i<srs->sr_state.numcsns; i++ ) {
2335                                         if ( sid == srs->sr_state.sids[i] &&
2336                                                 ber_bvcmp( &a->a_nvals[0],
2337                                                         &srs->sr_state.ctxcsn[i] )<= 0 ) {
2338                                                 Debug( LDAP_DEBUG_SYNC,
2339                                                         "Entry %s CSN %s older or equal to ctx %s\n",
2340                                                         rs->sr_entry->e_name.bv_val,
2341                                                         a->a_nvals[0].bv_val,
2342                                                         srs->sr_state.ctxcsn[i].bv_val );
2343                                                 return LDAP_SUCCESS;
2344                                         }
2345                                 }
2346                         }
2347                 }
2348                 rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2349                         op->o_tmpmemctx );
2350                 rs->sr_ctrls[1] = NULL;
2351                 rs->sr_flags |= REP_CTRLS_MUSTBEFREED;
2352                 /* If we're in delta-sync mode, always send a cookie */
2353                 if ( si->si_nopres && si->si_usehint && a ) {
2354                         struct berval cookie;
2355                         slap_compose_sync_cookie( op, &cookie, a->a_nvals, srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2356                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2357                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 1, &cookie );
2358                 } else {
2359                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2360                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2361                 }
2362         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2363                 struct berval cookie = BER_BVNULL;
2364
2365                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2366                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2367                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2368                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2369
2370                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2371                 }
2372
2373                 /* Is this a regular refresh?
2374                  * Note: refresh never gets here if there were no changes
2375                  */
2376                 if ( !ss->ss_so ) {
2377                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2378                                 op->o_tmpmemctx );
2379                         rs->sr_ctrls[1] = NULL;
2380                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2381                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2382                                         LDAP_SYNC_REFRESH_DELETES );
2383                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2384                 } else {
2385                 /* It's RefreshAndPersist, transition to Persist phase */
2386                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2387                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2388                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2389                                 1, NULL, 0 );
2390                         if ( !BER_BVISNULL( &cookie ))
2391                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2392
2393                         /* Detach this Op from frontend control */
2394                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2395
2396                         /* But not if this connection was closed along the way */
2397                         if ( op->o_abandon ) {
2398                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2399                                 /* syncprov_ab_cleanup will free this syncop */
2400                                 return SLAPD_ABANDON;
2401
2402                         } else {
2403                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2404                                 /* Turn off the refreshing flag */
2405                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2406
2407                                 syncprov_detach_op( op, ss->ss_so, on );
2408
2409                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2410
2411                                 /* If there are queued responses, fire them off */
2412                                 if ( ss->ss_so->s_res )
2413                                         syncprov_qstart( ss->ss_so );
2414                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2415                         }
2416
2417                         return LDAP_SUCCESS;
2418                 }
2419         }
2420
2421         return SLAP_CB_CONTINUE;
2422 }
2423
2424 static int
2425 syncprov_op_search( Operation *op, SlapReply *rs )
2426 {
2427         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2428         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2429         slap_callback   *cb;
2430         int gotstate = 0, changed = 0, do_present = 0;
2431         syncops *sop = NULL;
2432         searchstate *ss;
2433         sync_control *srs;
2434         BerVarray ctxcsn;
2435         int i, *sids, numcsns;
2436         struct berval mincsn, maxcsn;
2437         int minsid, maxsid;
2438         int dirty = 0;
2439
2440         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2441
2442         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2443                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2444                 return rs->sr_err;
2445         }
2446
2447         srs = op->o_controls[slap_cids.sc_LDAPsync];
2448
2449         /* If this is a persistent search, set it up right away */
2450         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2451                 syncops so = {0};
2452                 fbase_cookie fc;
2453                 opcookie opc;
2454                 slap_callback sc;
2455
2456                 fc.fss = &so;
2457                 fc.fbase = 0;
2458                 so.s_eid = NOID;
2459                 so.s_op = op;
2460                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2461                 /* syncprov_findbase expects to be called as a callback... */
2462                 sc.sc_private = &opc;
2463                 opc.son = on;
2464                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2465                 cb = op->o_callback;
2466                 op->o_callback = &sc;
2467                 rs->sr_err = syncprov_findbase( op, &fc );
2468                 op->o_callback = cb;
2469                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2470
2471                 if ( rs->sr_err != LDAP_SUCCESS ) {
2472                         send_ldap_result( op, rs );
2473                         return rs->sr_err;
2474                 }
2475                 sop = ch_malloc( sizeof( syncops ));
2476                 *sop = so;
2477                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2478                 sop->s_rid = srs->sr_state.rid;
2479                 sop->s_sid = srs->sr_state.sid;
2480                 sop->s_inuse = 1;
2481
2482                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2483                 while ( si->si_active ) {
2484                         /* Wait for active mods to finish before proceeding, as they
2485                          * may already have inspected the si_ops list looking for
2486                          * consumers to replicate the change to.  Using the log
2487                          * doesn't help, as we may finish playing it before the
2488                          * active mods gets added to it.
2489                          */
2490                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2491                         if ( slapd_shutdown )
2492                                 return SLAPD_ABANDON;
2493                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2494                                 ldap_pvt_thread_yield();
2495                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2496                 }
2497                 sop->s_next = si->si_ops;
2498                 si->si_ops = sop;
2499                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2500         }
2501
2502         /* snapshot the ctxcsn */
2503         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2504         numcsns = si->si_numcsns;
2505         if ( numcsns ) {
2506                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2507                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2508                 for ( i=0; i<numcsns; i++ )
2509                         sids[i] = si->si_sids[i];
2510         } else {
2511                 ctxcsn = NULL;
2512                 sids = NULL;
2513         }
2514         dirty = si->si_dirty;
2515         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2516
2517         /* If we have a cookie, handle the PRESENT lookups */
2518         if ( srs->sr_state.ctxcsn ) {
2519                 sessionlog *sl;
2520                 int i, j;
2521
2522                 /* If we don't have any CSN of our own yet, pretend nothing
2523                  * has changed.
2524                  */
2525                 if ( !numcsns )
2526                         goto no_change;
2527
2528                 if ( !si->si_nopres )
2529                         do_present = SS_PRESENT;
2530
2531                 /* If there are SIDs we don't recognize in the cookie, drop them */
2532                 for (i=0; i<srs->sr_state.numcsns; ) {
2533                         for (j=i; j<numcsns; j++) {
2534                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2535                                         break;
2536                                 }
2537                         }
2538                         /* not found */
2539                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2540                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2541                                 srs->sr_state.numcsns--;
2542                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2543                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2544                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2545                                 }
2546                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2547                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2548                                 continue;
2549                         }
2550                         i++;
2551                 }
2552
2553                 if (srs->sr_state.numcsns != numcsns) {
2554                         /* consumer doesn't have the right number of CSNs */
2555                         changed = SS_CHANGED;
2556                         if ( srs->sr_state.ctxcsn ) {
2557                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2558                                 srs->sr_state.ctxcsn = NULL;
2559                         }
2560                         if ( srs->sr_state.sids ) {
2561                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2562                                 srs->sr_state.sids = NULL;
2563                         }
2564                         srs->sr_state.numcsns = 0;
2565                         goto shortcut;
2566                 }
2567
2568                 /* Find the smallest CSN which differs from contextCSN */
2569                 mincsn.bv_len = 0;
2570                 maxcsn.bv_len = 0;
2571                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2572                         int newer;
2573                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2574                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2575                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2576                                 maxcsn = srs->sr_state.ctxcsn[i];
2577                                 maxsid = sids[j];
2578                         }
2579                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2580                         /* If our state is newer, tell consumer about changes */
2581                         if ( newer < 0) {
2582                                 changed = SS_CHANGED;
2583                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2584                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2585                                         mincsn = srs->sr_state.ctxcsn[i];
2586                                         minsid = sids[j];
2587                                 }
2588                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2589                         /* our state is older, complain to consumer */
2590                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2591                                 rs->sr_text = "consumer state is newer than provider!";
2592 bailout:
2593                                 if ( sop ) {
2594                                         syncops **sp = &si->si_ops;
2595
2596                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2597                                         while ( *sp != sop )
2598                                                 sp = &(*sp)->s_next;
2599                                         *sp = sop->s_next;
2600                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2601                                         ch_free( sop );
2602                                 }
2603                                 rs->sr_ctrls = NULL;
2604                                 send_ldap_result( op, rs );
2605                                 return rs->sr_err;
2606                         }
2607                 }
2608                 if ( BER_BVISEMPTY( &mincsn )) {
2609                         mincsn = maxcsn;
2610                         minsid = maxsid;
2611                 }
2612
2613                 /* If nothing has changed, shortcut it */
2614                 if ( !changed && !dirty ) {
2615                         do_present = 0;
2616 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2617                                 LDAPControl     *ctrls[2];
2618
2619                                 ctrls[0] = NULL;
2620                                 ctrls[1] = NULL;
2621                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2622                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2623                                 rs->sr_ctrls = ctrls;
2624                                 rs->sr_err = LDAP_SUCCESS;
2625                                 send_ldap_result( op, rs );
2626                                 rs->sr_ctrls = NULL;
2627                                 return rs->sr_err;
2628                         }
2629                         goto shortcut;
2630                 }
2631
2632                 /* Do we have a sessionlog for this search? */
2633                 sl=si->si_logs;
2634                 if ( sl ) {
2635                         int do_play = 0;
2636                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2637                         /* Are there any log entries, and is the consumer state
2638                          * present in the session log?
2639                          */
2640                         if ( sl->sl_num > 0 ) {
2641                                 int i;
2642                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2643                                         /* SID not present == new enough */
2644                                         if ( minsid < sl->sl_sids[i] ) {
2645                                                 do_play = 1;
2646                                                 break;
2647                                         }
2648                                         /* SID present and new enough */
2649                                         if ( minsid == sl->sl_sids[i]
2650                                                 && ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 ) {
2651                                                 do_play = 1;
2652                                                 break;
2653                                         }
2654                                 }
2655                                 /* SID not present == new enough */
2656                                 if ( i == sl->sl_numcsns )
2657                                         do_play = 1;
2658                         }
2659                         if ( do_play ) {
2660                                 do_present = 0;
2661                                 /* mutex is unlocked in playlog */
2662                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2663                         } else {
2664                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2665                         }
2666                 }
2667                 /* Is the CSN still present in the database? */
2668                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2669                         /* No, so a reload is required */
2670                         /* the 2.2 consumer doesn't send this hint */
2671                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2672                                 if ( ctxcsn )
2673                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2674                                 if ( sids )
2675                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2676                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2677                                 rs->sr_text = "sync cookie is stale";
2678                                 goto bailout;
2679                         }
2680                         if ( srs->sr_state.ctxcsn ) {
2681                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2682                                 srs->sr_state.ctxcsn = NULL;
2683                         }
2684                         if ( srs->sr_state.sids ) {
2685                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2686                                 srs->sr_state.sids = NULL;
2687                         }
2688                         srs->sr_state.numcsns = 0;
2689                 } else {
2690                         gotstate = 1;
2691                         /* If changed and doing Present lookup, send Present UUIDs */
2692                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2693                                 LDAP_SUCCESS ) {
2694                                 if ( ctxcsn )
2695                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2696                                 if ( sids )
2697                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2698                                 goto bailout;
2699                         }
2700                 }
2701         } else {
2702                 /* No consumer state, assume something has changed */
2703                 changed = SS_CHANGED;
2704         }
2705
2706 shortcut:
2707         /* Append CSN range to search filter, save original filter
2708          * for persistent search evaluation
2709          */
2710         if ( sop ) {
2711                 sop->s_filterstr= op->ors_filterstr;
2712         }
2713
2714         /* If something changed, find the changes */
2715         if ( gotstate && ( changed || dirty ) ) {
2716                 Filter *fand, *fava;
2717
2718                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2719                 fand->f_choice = LDAP_FILTER_AND;
2720                 fand->f_next = NULL;
2721                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2722                 fand->f_and = fava;
2723                 fava->f_choice = LDAP_FILTER_GE;
2724                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2725                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2726 #ifdef LDAP_COMP_MATCH
2727                 fava->f_ava->aa_cf = NULL;
2728 #endif
2729                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2730                 fava->f_next = op->ors_filter;
2731                 if ( sop )
2732                         ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2733                 op->ors_filter = fand;
2734                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2735                 if ( sop ) {
2736                         sop->s_flags |= PS_FIX_FILTER;
2737                         ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2738                 }
2739         }
2740
2741         /* Let our callback add needed info to returned entries */
2742         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2743         ss = (searchstate *)(cb+1);
2744         ss->ss_on = on;
2745         ss->ss_so = sop;
2746         ss->ss_flags = do_present | changed;
2747         ss->ss_ctxcsn = ctxcsn;
2748         ss->ss_numcsns = numcsns;
2749         ss->ss_sids = sids;
2750         cb->sc_response = syncprov_search_response;
2751         cb->sc_cleanup = syncprov_search_cleanup;
2752         cb->sc_private = ss;
2753         cb->sc_next = op->o_callback;
2754         op->o_callback = cb;
2755
2756         /* If this is a persistent search and no changes were reported during
2757          * the refresh phase, just invoke the response callback to transition
2758          * us into persist phase
2759          */
2760         if ( !changed && !dirty ) {
2761                 rs->sr_err = LDAP_SUCCESS;
2762                 rs->sr_nentries = 0;
2763                 send_ldap_result( op, rs );
2764                 return rs->sr_err;
2765         }
2766         return SLAP_CB_CONTINUE;
2767 }
2768
2769 static int
2770 syncprov_operational(
2771         Operation *op,
2772         SlapReply *rs )
2773 {
2774         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2775         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2776
2777         /* This prevents generating unnecessarily; frontend will strip
2778          * any statically stored copy.
2779          */
2780         if ( op->o_sync != SLAP_CONTROL_NONE )
2781                 return SLAP_CB_CONTINUE;
2782
2783         if ( rs->sr_entry &&
2784                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2785
2786                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2787                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2788                         Attribute *a, **ap = NULL;
2789
2790                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2791                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2792                                         break;
2793                         }
2794
2795                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2796                         if ( si->si_ctxcsn ) {
2797                                 if ( !a ) {
2798                                         for ( ap = &rs->sr_operational_attrs; *ap;
2799                                                 ap=&(*ap)->a_next );
2800
2801                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2802                                         *ap = a;
2803                                 }
2804
2805                                 if ( !ap ) {
2806                                         if ( rs_entry2modifiable( op, rs, on )) {
2807                                                 a = attr_find( rs->sr_entry->e_attrs,
2808                                                         slap_schema.si_ad_contextCSN );
2809                                         }
2810                                         if ( a->a_nvals != a->a_vals ) {
2811                                                 ber_bvarray_free( a->a_nvals );
2812                                         }
2813                                         a->a_nvals = NULL;
2814                                         ber_bvarray_free( a->a_vals );
2815                                         a->a_vals = NULL;
2816                                         a->a_numvals = 0;
2817                                 }
2818                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2819                         }
2820                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2821                 }
2822         }
2823         return SLAP_CB_CONTINUE;
2824 }
2825
2826 enum {
2827         SP_CHKPT = 1,
2828         SP_SESSL,
2829         SP_NOPRES,
2830         SP_USEHINT
2831 };
2832
2833 static ConfigDriver sp_cf_gen;
2834
2835 static ConfigTable spcfg[] = {
2836         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2837                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2838                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2839                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2840         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2841                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2842                         "DESC 'Session log size in ops' "
2843                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2844         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2845                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2846                         "DESC 'Omit Present phase processing' "
2847                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2848         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2849                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2850                         "DESC 'Observe Reload Hint in Request control' "
2851                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2852         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2853 };
2854
2855 static ConfigOCs spocs[] = {
2856         { "( OLcfgOvOc:1.1 "
2857                 "NAME 'olcSyncProvConfig' "
2858                 "DESC 'SyncRepl Provider configuration' "
2859                 "SUP olcOverlayConfig "
2860                 "MAY ( olcSpCheckpoint "
2861                         "$ olcSpSessionlog "
2862                         "$ olcSpNoPresent "
2863                         "$ olcSpReloadHint "
2864                 ") )",
2865                         Cft_Overlay, spcfg },
2866         { NULL, 0, NULL }
2867 };
2868
2869 static int
2870 sp_cf_gen(ConfigArgs *c)
2871 {
2872         slap_overinst           *on = (slap_overinst *)c->bi;
2873         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2874         int rc = 0;
2875
2876         if ( c->op == SLAP_CONFIG_EMIT ) {
2877                 switch ( c->type ) {
2878                 case SP_CHKPT:
2879                         if ( si->si_chkops || si->si_chktime ) {
2880                                 struct berval bv;
2881                                 /* we assume si_chktime is a multiple of 60
2882                                  * because the parsed value was originally
2883                                  * multiplied by 60 */
2884                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2885                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2886                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2887                                         rc = 1;
2888                                 } else {
2889                                         bv.bv_val = c->cr_msg;
2890                                         value_add_one( &c->rvalue_vals, &bv );
2891                                 }
2892                         } else {
2893                                 rc = 1;
2894                         }
2895                         break;
2896                 case SP_SESSL:
2897                         if ( si->si_logs ) {
2898                                 c->value_int = si->si_logs->sl_size;
2899                         } else {
2900                                 rc = 1;
2901                         }
2902                         break;
2903                 case SP_NOPRES:
2904                         if ( si->si_nopres ) {
2905                                 c->value_int = 1;
2906                         } else {
2907                                 rc = 1;
2908                         }
2909                         break;
2910                 case SP_USEHINT:
2911                         if ( si->si_usehint ) {
2912                                 c->value_int = 1;
2913                         } else {
2914                                 rc = 1;
2915                         }
2916                         break;
2917                 }
2918                 return rc;
2919         } else if ( c->op == LDAP_MOD_DELETE ) {
2920                 switch ( c->type ) {
2921                 case SP_CHKPT:
2922                         si->si_chkops = 0;
2923                         si->si_chktime = 0;
2924                         break;
2925                 case SP_SESSL:
2926                         if ( si->si_logs )
2927                                 si->si_logs->sl_size = 0;
2928                         else
2929                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2930                         break;
2931                 case SP_NOPRES:
2932                         if ( si->si_nopres )
2933                                 si->si_nopres = 0;
2934                         else
2935                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2936                         break;
2937                 case SP_USEHINT:
2938                         if ( si->si_usehint )
2939                                 si->si_usehint = 0;
2940                         else
2941                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2942                         break;
2943                 }
2944                 return rc;
2945         }
2946         switch ( c->type ) {
2947         case SP_CHKPT:
2948                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2949                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2950                                 c->argv[0], c->argv[1] );
2951                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2952                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2953                         return ARG_BAD_CONF;
2954                 }
2955                 if ( si->si_chkops <= 0 ) {
2956                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2957                                 c->argv[0], si->si_chkops );
2958                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2959                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2960                         return ARG_BAD_CONF;
2961                 }
2962                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2963                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2964                                 c->argv[0], c->argv[1] );
2965                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2966                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2967                         return ARG_BAD_CONF;
2968                 }
2969                 if ( si->si_chktime <= 0 ) {
2970                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2971                                 c->argv[0], si->si_chkops );
2972                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2973                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2974                         return ARG_BAD_CONF;
2975                 }
2976                 si->si_chktime *= 60;
2977                 break;
2978         case SP_SESSL: {
2979                 sessionlog *sl;
2980                 int size = c->value_int;
2981
2982                 if ( size < 0 ) {
2983                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2984                                 c->argv[0], size );
2985                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2986                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2987                         return ARG_BAD_CONF;
2988                 }
2989                 sl = si->si_logs;
2990                 if ( !sl ) {
2991                         sl = ch_malloc( sizeof( sessionlog ));
2992                         sl->sl_mincsn = NULL;
2993                         sl->sl_sids = NULL;
2994                         sl->sl_num = 0;
2995                         sl->sl_numcsns = 0;
2996                         sl->sl_head = sl->sl_tail = NULL;
2997                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
2998                         si->si_logs = sl;
2999                 }
3000                 sl->sl_size = size;
3001                 }
3002                 break;
3003         case SP_NOPRES:
3004                 si->si_nopres = c->value_int;
3005                 break;
3006         case SP_USEHINT:
3007                 si->si_usehint = c->value_int;
3008                 break;
3009         }
3010         return rc;
3011 }
3012
3013 /* ITS#3456 we cannot run this search on the main thread, must use a
3014  * child thread in order to insure we have a big enough stack.
3015  */
3016 static void *
3017 syncprov_db_otask(
3018         void *ptr
3019 )
3020 {
3021         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3022         return NULL;
3023 }
3024
3025
3026 /* Read any existing contextCSN from the underlying db.
3027  * Then search for any entries newer than that. If no value exists,
3028  * just generate it. Cache whatever result.
3029  */
3030 static int
3031 syncprov_db_open(
3032         BackendDB *be,
3033         ConfigReply *cr
3034 )
3035 {
3036         slap_overinst   *on = (slap_overinst *) be->bd_info;
3037         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3038
3039         Connection conn = { 0 };
3040         OperationBuffer opbuf;
3041         Operation *op;
3042         Entry *e = NULL;
3043         Attribute *a;
3044         int rc;
3045         void *thrctx = NULL;
3046
3047         if ( !SLAP_LASTMOD( be )) {
3048                 Debug( LDAP_DEBUG_ANY,
3049                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3050                 return -1;
3051         }
3052
3053         if ( slapMode & SLAP_TOOL_MODE ) {
3054                 return 0;
3055         }
3056
3057         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3058         if ( rc ) {
3059                 return rc;
3060         }
3061
3062         thrctx = ldap_pvt_thread_pool_context();
3063         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3064         op = &opbuf.ob_op;
3065         op->o_bd = be;
3066         op->o_dn = be->be_rootdn;
3067         op->o_ndn = be->be_rootndn;
3068
3069         if ( SLAP_SYNC_SUBENTRY( be )) {
3070                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3071                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3072         } else {
3073                 si->si_contextdn = be->be_nsuffix[0];
3074         }
3075         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3076                 slap_schema.si_ad_contextCSN, 0, &e, on );
3077
3078         if ( e ) {
3079                 ldap_pvt_thread_t tid;
3080
3081                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3082                 if ( a ) {
3083                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3084                         si->si_numcsns = a->a_numvals;
3085                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3086                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3087                 }
3088                 overlay_entry_release_ov( op, e, 0, on );
3089                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3090                         op->o_req_dn = be->be_suffix[0];
3091                         op->o_req_ndn = be->be_nsuffix[0];
3092                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3093                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3094                         ldap_pvt_thread_join( tid, NULL );
3095                 }
3096         }
3097
3098         /* Didn't find a contextCSN, should we generate one? */
3099         if ( !si->si_ctxcsn ) {
3100                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3101                 struct berval csn;
3102
3103                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
3104                 /* If we're also a consumer, then don't generate anything.
3105                  * Wait for our provider to send it to us, or for a local
3106                  * modify if we have multimaster.
3107                  */
3108                         goto out;
3109                 }
3110                 csn.bv_val = csnbuf;
3111                 csn.bv_len = sizeof( csnbuf );
3112                 slap_get_csn( op, &csn, 0 );
3113                 value_add_one( &si->si_ctxcsn, &csn );
3114                 si->si_numcsns = 1;
3115                 si->si_sids = ch_malloc( sizeof(int) );
3116                 si->si_sids[0] = slap_serverID;
3117
3118                 /* make sure we do a checkpoint on close */
3119                 si->si_numops++;
3120         }
3121
3122         /* Initialize the sessionlog mincsn */
3123         if ( si->si_logs && si->si_numcsns ) {
3124                 sessionlog *sl = si->si_logs;
3125                 int i;
3126                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3127                 sl->sl_numcsns = si->si_numcsns;
3128                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3129                 for ( i=0; i < si->si_numcsns; i++ )
3130                         sl->sl_sids[i] = si->si_sids[i];
3131         }
3132
3133 out:
3134         op->o_bd->bd_info = (BackendInfo *)on;
3135         return 0;
3136 }
3137
3138 /* Write the current contextCSN into the underlying db.
3139  */
3140 static int
3141 syncprov_db_close(
3142         BackendDB *be,
3143         ConfigReply *cr
3144 )
3145 {
3146     slap_overinst   *on = (slap_overinst *) be->bd_info;
3147     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3148 #ifdef SLAP_CONFIG_DELETE
3149         syncops *so, *sonext;
3150 #endif /* SLAP_CONFIG_DELETE */
3151
3152         if ( slapMode & SLAP_TOOL_MODE ) {
3153                 return 0;
3154         }
3155         if ( si->si_numops ) {
3156                 Connection conn = {0};
3157                 OperationBuffer opbuf;
3158                 Operation *op;
3159                 void *thrctx;
3160
3161                 thrctx = ldap_pvt_thread_pool_context();
3162                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3163                 op = &opbuf.ob_op;
3164                 op->o_bd = be;
3165                 op->o_dn = be->be_rootdn;
3166                 op->o_ndn = be->be_rootndn;
3167                 syncprov_checkpoint( op, on );
3168         }
3169
3170 #ifdef SLAP_CONFIG_DELETE
3171         if ( !slapd_shutdown ) {
3172                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3173                         SlapReply rs = {REP_RESULT};
3174                         rs.sr_err = LDAP_UNAVAILABLE;
3175                         send_ldap_result( so->s_op, &rs );
3176                         sonext=so->s_next;
3177                         syncprov_drop_psearch( so, 0);
3178                 }
3179                 si->si_ops=NULL;
3180         }
3181         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3182 #endif /* SLAP_CONFIG_DELETE */
3183
3184     return 0;
3185 }
3186
3187 static int
3188 syncprov_db_init(
3189         BackendDB *be,
3190         ConfigReply *cr
3191 )
3192 {
3193         slap_overinst   *on = (slap_overinst *)be->bd_info;
3194         syncprov_info_t *si;
3195
3196         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3197                 Debug( LDAP_DEBUG_ANY,
3198                         "syncprov must be instantiated within a database.\n",
3199                         0, 0, 0 );
3200                 return 1;
3201         }
3202
3203         si = ch_calloc(1, sizeof(syncprov_info_t));
3204         on->on_bi.bi_private = si;
3205         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3206         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3207         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3208         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3209
3210         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3211         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3212         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3213         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3214
3215         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3216         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3217
3218         return 0;
3219 }
3220
3221 static int
3222 syncprov_db_destroy(
3223         BackendDB *be,
3224         ConfigReply *cr
3225 )
3226 {
3227         slap_overinst   *on = (slap_overinst *)be->bd_info;
3228         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3229
3230         if ( si ) {
3231                 if ( si->si_logs ) {
3232                         sessionlog *sl = si->si_logs;
3233                         slog_entry *se = sl->sl_head;
3234
3235                         while ( se ) {
3236                                 slog_entry *se_next = se->se_next;
3237                                 ch_free( se );
3238                                 se = se_next;
3239                         }
3240                         if ( sl->sl_mincsn )
3241                                 ber_bvarray_free( sl->sl_mincsn );
3242                         if ( sl->sl_sids )
3243                                 ch_free( sl->sl_sids );
3244
3245                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3246                         ch_free( si->si_logs );
3247                 }
3248                 if ( si->si_ctxcsn )
3249                         ber_bvarray_free( si->si_ctxcsn );
3250                 if ( si->si_sids )
3251                         ch_free( si->si_sids );
3252                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3253                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3254                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3255                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3256                 ch_free( si );
3257         }
3258
3259         return 0;
3260 }
3261
3262 static int syncprov_parseCtrl (
3263         Operation *op,
3264         SlapReply *rs,
3265         LDAPControl *ctrl )
3266 {
3267         ber_tag_t tag;
3268         BerElementBuffer berbuf;
3269         BerElement *ber = (BerElement *)&berbuf;
3270         ber_int_t mode;
3271         ber_len_t len;
3272         struct berval cookie = BER_BVNULL;
3273         sync_control *sr;
3274         int rhint = 0;
3275
3276         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3277                 rs->sr_text = "Sync control specified multiple times";
3278                 return LDAP_PROTOCOL_ERROR;
3279         }
3280
3281         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3282                 rs->sr_text = "Sync control specified with pagedResults control";
3283                 return LDAP_PROTOCOL_ERROR;
3284         }
3285
3286         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3287                 rs->sr_text = "Sync control value is absent";
3288                 return LDAP_PROTOCOL_ERROR;
3289         }
3290
3291         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3292                 rs->sr_text = "Sync control value is empty";
3293                 return LDAP_PROTOCOL_ERROR;
3294         }
3295
3296         /* Parse the control value
3297          *      syncRequestValue ::= SEQUENCE {
3298          *              mode   ENUMERATED {
3299          *                      -- 0 unused
3300          *                      refreshOnly             (1),
3301          *                      -- 2 reserved
3302          *                      refreshAndPersist       (3)
3303          *              },
3304          *              cookie  syncCookie OPTIONAL
3305          *      }
3306          */
3307
3308         ber_init2( ber, &ctrl->ldctl_value, 0 );
3309
3310         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3311                 rs->sr_text = "Sync control : mode decoding error";
3312                 return LDAP_PROTOCOL_ERROR;
3313         }
3314
3315         switch( mode ) {
3316         case LDAP_SYNC_REFRESH_ONLY:
3317                 mode = SLAP_SYNC_REFRESH;
3318                 break;
3319         case LDAP_SYNC_REFRESH_AND_PERSIST:
3320                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3321                 break;
3322         default:
3323                 rs->sr_text = "Sync control : unknown update mode";
3324                 return LDAP_PROTOCOL_ERROR;
3325         }
3326
3327         tag = ber_peek_tag( ber, &len );
3328
3329         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3330                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3331                         rs->sr_text = "Sync control : cookie decoding error";
3332                         return LDAP_PROTOCOL_ERROR;
3333                 }
3334                 tag = ber_peek_tag( ber, &len );
3335         }
3336         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3337                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3338                         rs->sr_text = "Sync control : rhint decoding error";
3339                         return LDAP_PROTOCOL_ERROR;
3340                 }
3341         }
3342         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3343                         rs->sr_text = "Sync control : decoding error";
3344                         return LDAP_PROTOCOL_ERROR;
3345         }
3346         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3347         sr->sr_rhint = rhint;
3348         if (!BER_BVISNULL(&cookie)) {
3349                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3350                 /* If parse fails, pretend no cookie was sent */
3351                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3352                         sr->sr_state.rid == -1 ) {
3353                         if ( sr->sr_state.ctxcsn ) {
3354                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3355                                 sr->sr_state.ctxcsn = NULL;
3356                         }
3357                         sr->sr_state.numcsns = 0;
3358                 }
3359         }
3360
3361         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3362
3363         op->o_sync = ctrl->ldctl_iscritical
3364                 ? SLAP_CONTROL_CRITICAL
3365                 : SLAP_CONTROL_NONCRITICAL;
3366
3367         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3368
3369         return LDAP_SUCCESS;
3370 }
3371
3372 /* This overlay is set up for dynamic loading via moduleload. For static
3373  * configuration, you'll need to arrange for the slap_overinst to be
3374  * initialized and registered by some other function inside slapd.
3375  */
3376
3377 static slap_overinst            syncprov;
3378
3379 int
3380 syncprov_initialize()
3381 {
3382         int rc;
3383
3384         rc = register_supported_control( LDAP_CONTROL_SYNC,
3385                 SLAP_CTRL_SEARCH, NULL,
3386                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3387         if ( rc != LDAP_SUCCESS ) {
3388                 Debug( LDAP_DEBUG_ANY,
3389                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3390                 return rc;
3391         }
3392
3393         syncprov.on_bi.bi_type = "syncprov";
3394         syncprov.on_bi.bi_db_init = syncprov_db_init;
3395         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3396         syncprov.on_bi.bi_db_open = syncprov_db_open;
3397         syncprov.on_bi.bi_db_close = syncprov_db_close;
3398
3399         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3400         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3401
3402         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3403         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3404         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3405         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3406         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3407         syncprov.on_bi.bi_op_search = syncprov_op_search;
3408         syncprov.on_bi.bi_extended = syncprov_op_extended;
3409         syncprov.on_bi.bi_operational = syncprov_operational;
3410
3411         syncprov.on_bi.bi_cf_ocs = spocs;
3412
3413         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3414
3415         rc = config_register_schema( spcfg, spocs );
3416         if ( rc ) return rc;
3417
3418         return overlay_register( &syncprov );
3419 }
3420
3421 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3422 int
3423 init_module( int argc, char *argv[] )
3424 {
3425         return syncprov_initialize();
3426 }
3427 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3428
3429 #endif /* defined(SLAPD_OVER_SYNCPROV) */