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, 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         csns[0] = opc->sctxcsn;
 834         BER_BVZERO( &csns[1] );
 835         slap_compose_sync_cookie( op, &cookie, csns, so->s_rid, slap_serverID ? slap_serverID : -1 );
 836
 837 #ifdef LDAP_DEBUG
 838         if ( so->s_sid > 0 ) {
 839                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: to=%03x, cookie=%s\n",
 840                         so->s_sid, cookie.bv_val, 0 );
 841         } else {
 842                 Debug( LDAP_DEBUG_SYNC, "syncprov_sendresp: cookie=%s\n",
 843                         cookie.bv_val, 0, 0 );
 844         }
 845 #endif
 846
 847         e_uuid.e_attrs = &a_uuid;
 848         a_uuid.a_desc = slap_schema.si_ad_entryUUID;
 849         a_uuid.a_nvals = &opc->suuid;
 850         rs.sr_err = syncprov_state_ctrl( op, &rs, &e_uuid,
 851                 mode, ctrls, 0, 1, &cookie );
 852         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
 853
 854         rs.sr_ctrls = ctrls;
 855         rs.sr_entry = &e_uuid;
 856         if ( mode == LDAP_SYNC_ADD || mode == LDAP_SYNC_MODIFY ) {
 857                 e_uuid = *opc->se;
 858                 e_uuid.e_private = NULL;
 859         }
 860
 861         switch( mode ) {
 862         case LDAP_SYNC_ADD:
 863                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 864                         rs.sr_ref = get_entry_referrals( op, rs.sr_entry );
 865                         rs.sr_err = send_search_reference( op, &rs );
 866                         ber_bvarray_free( rs.sr_ref );
 867                         break;
 868                 }
 869                 /* fallthru */
 870         case LDAP_SYNC_MODIFY:
 871                 rs.sr_attrs = op->ors_attrs;
 872                 rs.sr_err = send_search_entry( op, &rs );
 873                 break;
 874         case LDAP_SYNC_DELETE:
 875                 e_uuid.e_attrs = NULL;
 876                 e_uuid.e_name = opc->sdn;
 877                 e_uuid.e_nname = opc->sndn;
 878                 if ( opc->sreference && so->s_op->o_managedsait <= SLAP_CONTROL_IGNORED ) {
 879                         struct berval bv = BER_BVNULL;
 880                         rs.sr_ref = &bv;
 881                         rs.sr_err = send_search_reference( op, &rs );
 882                 } else {
 883                         rs.sr_err = send_search_entry( op, &rs );
 884                 }
 885                 break;
 886         default:
 887                 assert(0);
 888         }
 889         /* In case someone else freed it already? */
 890         if ( rs.sr_ctrls ) {
 891                 int i;
 892                 for ( i=0; rs.sr_ctrls[i]; i++ ) {
 893                         if ( rs.sr_ctrls[i] == ctrls[0] ) {
 894                                 op->o_tmpfree( ctrls[0]->ldctl_value.bv_val, op->o_tmpmemctx );
 895                                 ctrls[0]->ldctl_value.bv_val = NULL;
 896                                 break;
 897                         }
 898                 }
 899                 rs.sr_ctrls = NULL;
 900         }
 901
 902         return rs.sr_err;
 903 }
 904
 905 static void
 906 syncprov_qstart( syncops *so );
 907
 908 /* Play back queued responses */
 909 static int
 910 syncprov_qplay( Operation *op, syncops *so )
 911 {
 912         slap_overinst *on = LDAP_SLIST_FIRST(&so->s_op->o_extra)->oe_key;
 913         syncres *sr;
 914         opcookie opc;
 915         int rc = 0;
 916
 917         opc.son = on;
 918
 919         do {
 920                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 921                 /* Exit loop with mutex held */
 922                 if ( so->s_op->o_abandon )
 923                         break;
 924                 sr = so->s_res;
 925                 /* Exit loop with mutex held */
 926                 if ( !sr )
 927                         break;
 928                 so->s_res = sr->s_next;
 929                 if ( !so->s_res )
 930                         so->s_restail = NULL;
 931                 ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 932
 933                 if ( sr->s_mode == LDAP_SYNC_NEW_COOKIE ) {
 934                         SlapReply rs = { REP_INTERMEDIATE };
 935
 936                         rc = syncprov_sendinfo( op, &rs, LDAP_TAG_SYNC_NEW_COOKIE,
 937                                 &sr->s_csn, 0, NULL, 0 );
 938                 } else {
 939                         opc.sdn = sr->s_dn;
 940                         opc.sndn = sr->s_ndn;
 941                         opc.suuid = sr->s_uuid;
 942                         opc.sctxcsn = sr->s_csn;
 943                         opc.sreference = sr->s_isreference;
 944                         opc.se = sr->s_e;
 945
 946                         rc = syncprov_sendresp( op, &opc, so, sr->s_mode );
 947
 948                 }
 949                 if ( sr->s_e ) {
 950                         if ( !dec_mutexint( sr->s_e->e_private )) {
 951                                 sr->s_e->e_private = NULL;
 952                                 entry_free ( sr->s_e );
 953                         }
 954                 }
 955
 956                 ch_free( sr );
 957
 958                 /* Exit loop with mutex held */
 959                 ldap_pvt_thread_mutex_lock( &so->s_mutex );
 960
 961         } while (0);
 962
 963         /* We now only send one change at a time, to prevent one
 964          * psearch from hogging all the CPU. Resubmit this task if
 965          * there are more responses queued and no errors occurred.
 966          */
 967
 968         if ( rc == 0 && so->s_res ) {
 969                 syncprov_qstart( so );
 970         } else {
 971                 so->s_flags ^= PS_TASK_QUEUED;
 972         }
 973
 974         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
 975         return rc;
 976 }
 977
 978 /* task for playing back queued responses */
 979 static void *
 980 syncprov_qtask( void *ctx, void *arg )
 981 {
 982         syncops *so = arg;
 983         OperationBuffer opbuf;
 984         Operation *op;
 985         BackendDB be;
 986         int rc;
 987
 988         op = &opbuf.ob_op;
 989         *op = *so->s_op;
 990         op->o_hdr = &opbuf.ob_hdr;
 991         op->o_controls = opbuf.ob_controls;
 992         memset( op->o_controls, 0, sizeof(opbuf.ob_controls) );
 993         op->o_sync = SLAP_CONTROL_IGNORED;
 994
 995         *op->o_hdr = *so->s_op->o_hdr;
 996
 997         op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx, 1);
 998         op->o_tmpmfuncs = &slap_sl_mfuncs;
 999         op->o_threadctx = ctx;
1000
1001         /* syncprov_qplay expects a fake db */
1002         be = *so->s_op->o_bd;
1003         be.be_flags |= SLAP_DBFLAG_OVERLAY;
1004         op->o_bd = &be;
1005         LDAP_SLIST_FIRST(&op->o_extra) = NULL;
1006         op->o_callback = NULL;
1007
1008         rc = syncprov_qplay( op, so );
1009
1010         /* decrement use count... */
1011         syncprov_free_syncop( so );
1012
1013         return NULL;
1014 }
1015
1016 /* Start the task to play back queued psearch responses */
1017 static void
1018 syncprov_qstart( syncops *so )
1019 {
1020         so->s_flags |= PS_TASK_QUEUED;
1021         so->s_inuse++;
1022         ldap_pvt_thread_pool_submit( &connection_pool,
1023                 syncprov_qtask, so );
1024 }
1025
1026 /* Queue a persistent search response */
1027 static int
1028 syncprov_qresp( opcookie *opc, syncops *so, int mode )
1029 {
1030         syncres *sr;
1031         int srsize;
1032         struct berval cookie = opc->sctxcsn;
1033
1034         if ( mode == LDAP_SYNC_NEW_COOKIE ) {
1035                 syncprov_info_t *si = opc->son->on_bi.bi_private;
1036
1037                 slap_compose_sync_cookie( NULL, &cookie, si->si_ctxcsn,
1038                         so->s_rid, slap_serverID ? slap_serverID : -1);
1039         }
1040
1041         srsize = sizeof(syncres) + opc->suuid.bv_len + 1 +
1042                 opc->sdn.bv_len + 1 + opc->sndn.bv_len + 1;
1043         if ( cookie.bv_len )
1044                 srsize += cookie.bv_len + 1;
1045         sr = ch_malloc( srsize );
1046         sr->s_next = NULL;
1047         sr->s_e = opc->se;
1048         /* bump refcount on this entry */
1049         if ( opc->se )
1050                 inc_mutexint( opc->se->e_private );
1051         sr->s_dn.bv_val = (char *)(sr + 1);
1052         sr->s_dn.bv_len = opc->sdn.bv_len;
1053         sr->s_mode = mode;
1054         sr->s_isreference = opc->sreference;
1055         sr->s_ndn.bv_val = lutil_strcopy( sr->s_dn.bv_val,
1056                  opc->sdn.bv_val ) + 1;
1057         sr->s_ndn.bv_len = opc->sndn.bv_len;
1058         sr->s_uuid.bv_val = lutil_strcopy( sr->s_ndn.bv_val,
1059                  opc->sndn.bv_val ) + 1;
1060         sr->s_uuid.bv_len = opc->suuid.bv_len;
1061         AC_MEMCPY( sr->s_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1062         if ( cookie.bv_len ) {
1063                 sr->s_csn.bv_val = sr->s_uuid.bv_val + sr->s_uuid.bv_len + 1;
1064                 strcpy( sr->s_csn.bv_val, cookie.bv_val );
1065         } else {
1066                 sr->s_csn.bv_val = NULL;
1067         }
1068         sr->s_csn.bv_len = cookie.bv_len;
1069
1070         if ( mode == LDAP_SYNC_NEW_COOKIE && cookie.bv_val ) {
1071                 ch_free( cookie.bv_val );
1072         }
1073
1074         ldap_pvt_thread_mutex_lock( &so->s_mutex );
1075         if ( !so->s_res ) {
1076                 so->s_res = sr;
1077         } else {
1078                 so->s_restail->s_next = sr;
1079         }
1080         so->s_restail = sr;
1081
1082         /* If the base of the psearch was modified, check it next time round */
1083         if ( so->s_flags & PS_WROTE_BASE ) {
1084                 so->s_flags ^= PS_WROTE_BASE;
1085                 so->s_flags |= PS_FIND_BASE;
1086         }
1087         if (( so->s_flags & (PS_IS_DETACHED|PS_TASK_QUEUED)) == PS_IS_DETACHED ) {
1088                 syncprov_qstart( so );
1089         }
1090         ldap_pvt_thread_mutex_unlock( &so->s_mutex );
1091         return LDAP_SUCCESS;
1092 }
1093
1094 static int
1095 syncprov_drop_psearch( syncops *so, int lock )
1096 {
1097         if ( so->s_flags & PS_IS_DETACHED ) {
1098                 if ( lock )
1099                         ldap_pvt_thread_mutex_lock( &so->s_op->o_conn->c_mutex );
1100                 so->s_op->o_conn->c_n_ops_executing--;
1101                 so->s_op->o_conn->c_n_ops_completed++;
1102                 LDAP_STAILQ_REMOVE( &so->s_op->o_conn->c_ops, so->s_op, Operation,
1103                         o_next );
1104                 if ( lock )
1105                         ldap_pvt_thread_mutex_unlock( &so->s_op->o_conn->c_mutex );
1106         }
1107         syncprov_free_syncop( so );
1108
1109         return 0;
1110 }
1111
1112 static int
1113 syncprov_ab_cleanup( Operation *op, SlapReply *rs )
1114 {
1115         slap_callback *sc = op->o_callback;
1116         op->o_callback = sc->sc_next;
1117         syncprov_drop_psearch( op->o_callback->sc_private, 0 );
1118         op->o_tmpfree( sc, op->o_tmpmemctx );
1119         return 0;
1120 }
1121
1122 static int
1123 syncprov_op_abandon( Operation *op, SlapReply *rs )
1124 {
1125         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1126         syncprov_info_t         *si = on->on_bi.bi_private;
1127         syncops *so, *soprev;
1128
1129         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1130         for ( so=si->si_ops, soprev = (syncops *)&si->si_ops; so;
1131                 soprev=so, so=so->s_next ) {
1132                 if ( so->s_op->o_connid == op->o_connid &&
1133                         so->s_op->o_msgid == op->orn_msgid ) {
1134                                 so->s_op->o_abandon = 1;
1135                                 soprev->s_next = so->s_next;
1136                                 break;
1137                 }
1138         }
1139         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1140         if ( so ) {
1141                 /* Is this really a Cancel exop? */
1142                 if ( op->o_tag != LDAP_REQ_ABANDON ) {
1143                         so->s_op->o_cancel = SLAP_CANCEL_ACK;
1144                         rs->sr_err = LDAP_CANCELLED;
1145                         send_ldap_result( so->s_op, rs );
1146                         if ( so->s_flags & PS_IS_DETACHED ) {
1147                                 slap_callback *cb;
1148                                 cb = op->o_tmpcalloc( 1, sizeof(slap_callback), op->o_tmpmemctx );
1149                                 cb->sc_cleanup = syncprov_ab_cleanup;
1150                                 cb->sc_next = op->o_callback;
1151                                 cb->sc_private = so;
1152                                 return SLAP_CB_CONTINUE;
1153                         }
1154                 }
1155                 syncprov_drop_psearch( so, 0 );
1156         }
1157         return SLAP_CB_CONTINUE;
1158 }
1159
1160 /* Find which persistent searches are affected by this operation */
1161 static void
1162 syncprov_matchops( Operation *op, opcookie *opc, int saveit )
1163 {
1164         slap_overinst *on = opc->son;
1165         syncprov_info_t         *si = on->on_bi.bi_private;
1166
1167         fbase_cookie fc;
1168         syncops *ss, *sprev, *snext;
1169         Entry *e = NULL;
1170         Attribute *a;
1171         int rc;
1172         struct berval newdn;
1173         int freefdn = 0;
1174         BackendDB *b0 = op->o_bd, db;
1175
1176         fc.fdn = &op->o_req_ndn;
1177         /* compute new DN */
1178         if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1179                 struct berval pdn;
1180                 if ( op->orr_nnewSup ) pdn = *op->orr_nnewSup;
1181                 else dnParent( fc.fdn, &pdn );
1182                 build_new_dn( &newdn, &pdn, &op->orr_nnewrdn, op->o_tmpmemctx );
1183                 fc.fdn = &newdn;
1184                 freefdn = 1;
1185         }
1186         if ( op->o_tag != LDAP_REQ_ADD ) {
1187                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1188                         db = *op->o_bd;
1189                         op->o_bd = &db;
1190                 }
1191                 rc = overlay_entry_get_ov( op, fc.fdn, NULL, NULL, 0, &e, on );
1192                 /* If we're sending responses now, make a copy and unlock the DB */
1193                 if ( e && !saveit ) {
1194                         if ( !opc->se ) {
1195                                 opc->se = entry_dup( e );
1196                                 opc->se->e_private = get_mutexint();
1197                         }
1198                         overlay_entry_release_ov( op, e, 0, on );
1199                         e = opc->se;
1200                 }
1201                 if ( rc ) {
1202                         op->o_bd = b0;
1203                         return;
1204                 }
1205         } else {
1206                 e = op->ora_e;
1207                 if ( !saveit ) {
1208                         if ( !opc->se ) {
1209                                 opc->se = entry_dup( e );
1210                                 opc->se->e_private = get_mutexint();
1211                         }
1212                         e = opc->se;
1213                 }
1214         }
1215
1216         if ( saveit || op->o_tag == LDAP_REQ_ADD ) {
1217                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1218                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1219                 opc->sreference = is_entry_referral( e );
1220                 a = attr_find( e->e_attrs, slap_schema.si_ad_entryUUID );
1221                 if ( a )
1222                         ber_dupbv_x( &opc->suuid, &a->a_nvals[0], op->o_tmpmemctx );
1223         } else if ( op->o_tag == LDAP_REQ_MODRDN && !saveit ) {
1224                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1225                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1226                 ber_dupbv_x( &opc->sdn, &e->e_name, op->o_tmpmemctx );
1227                 ber_dupbv_x( &opc->sndn, &e->e_nname, op->o_tmpmemctx );
1228         }
1229
1230         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1231         for (ss = si->si_ops, sprev = (syncops *)&si->si_ops; ss;
1232                 sprev = ss, ss=snext)
1233         {
1234                 Operation op2;
1235                 Opheader oh;
1236                 syncmatches *sm;
1237                 int found = 0;
1238
1239                 snext = ss->s_next;
1240                 if ( ss->s_op->o_abandon )
1241                         continue;
1242
1243                 /* Don't send ops back to the originator */
1244                 if ( opc->osid > 0 && opc->osid == ss->s_sid ) {
1245                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping original sid %03x\n",
1246                                 opc->osid, 0, 0 );
1247                         continue;
1248                 }
1249
1250                 /* Don't send ops back to the messenger */
1251                 if ( opc->rsid > 0 && opc->rsid == ss->s_sid ) {
1252                         Debug( LDAP_DEBUG_SYNC, "syncprov_matchops: skipping relayed sid %03x\n",
1253                                 opc->rsid, 0, 0 );
1254                         continue;
1255                 }
1256
1257                 /* validate base */
1258                 fc.fss = ss;
1259                 fc.fbase = 0;
1260                 fc.fscope = 0;
1261
1262                 /* If the base of the search is missing, signal a refresh */
1263                 rc = syncprov_findbase( op, &fc );
1264                 if ( rc != LDAP_SUCCESS ) {
1265                         SlapReply rs = {REP_RESULT};
1266                         send_ldap_error( ss->s_op, &rs, LDAP_SYNC_REFRESH_REQUIRED,
1267                                 "search base has changed" );
1268                         sprev->s_next = snext;
1269                         syncprov_drop_psearch( ss, 1 );
1270                         ss = sprev;
1271                         continue;
1272                 }
1273
1274                 /* If we're sending results now, look for this op in old matches */
1275                 if ( !saveit ) {
1276                         syncmatches *old;
1277
1278                         /* Did we modify the search base? */
1279                         if ( dn_match( &op->o_req_ndn, &ss->s_base )) {
1280                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1281                                 ss->s_flags |= PS_WROTE_BASE;
1282                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1283                         }
1284
1285                         for ( sm=opc->smatches, old=(syncmatches *)&opc->smatches; sm;
1286                                 old=sm, sm=sm->sm_next ) {
1287                                 if ( sm->sm_op == ss ) {
1288                                         found = 1;
1289                                         old->sm_next = sm->sm_next;
1290                                         op->o_tmpfree( sm, op->o_tmpmemctx );
1291                                         break;
1292                                 }
1293                         }
1294                 }
1295
1296                 if ( fc.fscope ) {
1297                         ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1298                         op2 = *ss->s_op;
1299                         oh = *op->o_hdr;
1300                         oh.oh_conn = ss->s_op->o_conn;
1301                         oh.oh_connid = ss->s_op->o_connid;
1302                         op2.o_bd = op->o_bd->bd_self;
1303                         op2.o_hdr = &oh;
1304                         op2.o_extra = op->o_extra;
1305                         op2.o_callback = NULL;
1306                         if (ss->s_flags & PS_FIX_FILTER) {
1307                                 /* Skip the AND/GE clause that we stuck on in front. We
1308                                    would lose deletes/mods that happen during the refresh
1309                                    phase otherwise (ITS#6555) */
1310                                 op2.ors_filter = ss->s_op->ors_filter->f_and->f_next;
1311                         }
1312                         ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1313                         rc = test_filter( &op2, e, op2.ors_filter );
1314                 }
1315
1316                 Debug( LDAP_DEBUG_TRACE, "syncprov_matchops: sid %03x fscope %d rc %d\n",
1317                         ss->s_sid, fc.fscope, rc );
1318
1319                 /* check if current o_req_dn is in scope and matches filter */
1320                 if ( fc.fscope && rc == LDAP_COMPARE_TRUE ) {
1321                         if ( saveit ) {
1322                                 sm = op->o_tmpalloc( sizeof(syncmatches), op->o_tmpmemctx );
1323                                 sm->sm_next = opc->smatches;
1324                                 sm->sm_op = ss;
1325                                 ldap_pvt_thread_mutex_lock( &ss->s_mutex );
1326                                 ++ss->s_inuse;
1327                                 ldap_pvt_thread_mutex_unlock( &ss->s_mutex );
1328                                 opc->smatches = sm;
1329                         } else {
1330                                 /* if found send UPDATE else send ADD */
1331                                 syncprov_qresp( opc, ss,
1332                                         found ? LDAP_SYNC_MODIFY : LDAP_SYNC_ADD );
1333                         }
1334                 } else if ( !saveit && found ) {
1335                         /* send DELETE */
1336                         syncprov_qresp( opc, ss, LDAP_SYNC_DELETE );
1337                 } else if ( !saveit ) {
1338                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1339                 }
1340                 if ( !saveit && found ) {
1341                         /* Decrement s_inuse, was incremented when called
1342                          * with saveit == TRUE
1343                          */
1344                         syncprov_free_syncop( ss );
1345                 }
1346         }
1347         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1348
1349         if ( op->o_tag != LDAP_REQ_ADD && e ) {
1350                 if ( !SLAP_ISOVERLAY( op->o_bd )) {
1351                         op->o_bd = &db;
1352                 }
1353                 if ( saveit )
1354                         overlay_entry_release_ov( op, e, 0, on );
1355                 op->o_bd = b0;
1356         }
1357         if ( opc->se && !saveit ) {
1358                 if ( !dec_mutexint( opc->se->e_private )) {
1359                         opc->se->e_private = NULL;
1360                         entry_free( opc->se );
1361                         opc->se = NULL;
1362                 }
1363         }
1364         if ( freefdn ) {
1365                 op->o_tmpfree( fc.fdn->bv_val, op->o_tmpmemctx );
1366         }
1367         op->o_bd = b0;
1368 }
1369
1370 static int
1371 syncprov_op_cleanup( Operation *op, SlapReply *rs )
1372 {
1373         slap_callback *cb = op->o_callback;
1374         opcookie *opc = cb->sc_private;
1375         slap_overinst *on = opc->son;
1376         syncprov_info_t         *si = on->on_bi.bi_private;
1377         syncmatches *sm, *snext;
1378         modtarget *mt;
1379
1380         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1381         if ( si->si_active )
1382                 si->si_active--;
1383         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1384
1385         for (sm = opc->smatches; sm; sm=snext) {
1386                 snext = sm->sm_next;
1387                 syncprov_free_syncop( sm->sm_op );
1388                 op->o_tmpfree( sm, op->o_tmpmemctx );
1389         }
1390
1391         /* Remove op from lock table */
1392         mt = opc->smt;
1393         if ( mt ) {
1394                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
1395                 mt->mt_mods = mt->mt_mods->mi_next;
1396                 /* If there are more, promote the next one */
1397                 if ( mt->mt_mods ) {
1398                         mt->mt_op = mt->mt_mods->mi_op;
1399                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1400                 } else {
1401                         ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
1402                         ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
1403                         avl_delete( &si->si_mods, mt, sp_avl_cmp );
1404                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
1405                         ldap_pvt_thread_mutex_destroy( &mt->mt_mutex );
1406                         ch_free( mt );
1407                 }
1408         }
1409         if ( !BER_BVISNULL( &opc->suuid ))
1410                 op->o_tmpfree( opc->suuid.bv_val, op->o_tmpmemctx );
1411         if ( !BER_BVISNULL( &opc->sndn ))
1412                 op->o_tmpfree( opc->sndn.bv_val, op->o_tmpmemctx );
1413         if ( !BER_BVISNULL( &opc->sdn ))
1414                 op->o_tmpfree( opc->sdn.bv_val, op->o_tmpmemctx );
1415         op->o_callback = cb->sc_next;
1416         op->o_tmpfree(cb, op->o_tmpmemctx);
1417
1418         return 0;
1419 }
1420
1421 static void
1422 syncprov_checkpoint( Operation *op, slap_overinst *on )
1423 {
1424         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
1425         Modifications mod;
1426         Operation opm;
1427         SlapReply rsm = {REP_RESULT};
1428         slap_callback cb = {0};
1429         BackendDB be;
1430         BackendInfo *bi;
1431
1432 #ifdef CHECK_CSN
1433         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1434
1435         int i;
1436         for ( i=0; i<si->si_numcsns; i++ ) {
1437                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1438         }
1439 #endif
1440         mod.sml_numvals = si->si_numcsns;
1441         mod.sml_values = si->si_ctxcsn;
1442         mod.sml_nvalues = NULL;
1443         mod.sml_desc = slap_schema.si_ad_contextCSN;
1444         mod.sml_op = LDAP_MOD_REPLACE;
1445         mod.sml_flags = SLAP_MOD_INTERNAL;
1446         mod.sml_next = NULL;
1447
1448         cb.sc_response = slap_null_cb;
1449         opm = *op;
1450         opm.o_tag = LDAP_REQ_MODIFY;
1451         opm.o_callback = &cb;
1452         opm.orm_modlist = &mod;
1453         opm.orm_no_opattrs = 1;
1454         if ( SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1455                 be = *on->on_info->oi_origdb;
1456                 opm.o_bd = &be;
1457         }
1458         opm.o_req_dn = si->si_contextdn;
1459         opm.o_req_ndn = si->si_contextdn;
1460         bi = opm.o_bd->bd_info;
1461         opm.o_bd->bd_info = on->on_info->oi_orig;
1462         opm.o_managedsait = SLAP_CONTROL_NONCRITICAL;
1463         opm.o_no_schema_check = 1;
1464         opm.o_bd->be_modify( &opm, &rsm );
1465
1466         if ( rsm.sr_err == LDAP_NO_SUCH_OBJECT &&
1467                 SLAP_SYNC_SUBENTRY( opm.o_bd )) {
1468                 const char      *text;
1469                 char txtbuf[SLAP_TEXT_BUFLEN];
1470                 size_t textlen = sizeof txtbuf;
1471                 Entry *e = slap_create_context_csn_entry( opm.o_bd, NULL );
1472                 rs_reinit( &rsm, REP_RESULT );
1473                 slap_mods2entry( &mod, &e, 0, 1, &text, txtbuf, textlen);
1474                 opm.ora_e = e;
1475                 opm.o_bd->be_add( &opm, &rsm );
1476                 if ( e == opm.ora_e )
1477                         be_entry_release_w( &opm, opm.ora_e );
1478         }
1479         opm.o_bd->bd_info = bi;
1480
1481         if ( mod.sml_next != NULL ) {
1482                 slap_mods_free( mod.sml_next, 1 );
1483         }
1484 #ifdef CHECK_CSN
1485         for ( i=0; i<si->si_numcsns; i++ ) {
1486                 assert( !syn->ssyn_validate( syn, si->si_ctxcsn+i ));
1487         }
1488 #endif
1489 }
1490
1491 static void
1492 syncprov_add_slog( Operation *op )
1493 {
1494         opcookie *opc = op->o_callback->sc_private;
1495         slap_overinst *on = opc->son;
1496         syncprov_info_t         *si = on->on_bi.bi_private;
1497         sessionlog *sl;
1498         slog_entry *se;
1499
1500         sl = si->si_logs;
1501         {
1502                 if ( BER_BVISEMPTY( &op->o_csn ) ) {
1503                         /* During the syncrepl refresh phase we can receive operations
1504                          * without a csn.  We cannot reliably determine the consumers
1505                          * state with respect to such operations, so we ignore them and
1506                          * wipe out anything in the log if we see them.
1507                          */
1508                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1509                         while ( se = sl->sl_head ) {
1510                                 sl->sl_head = se->se_next;
1511                                 ch_free( se );
1512                         }
1513                         sl->sl_tail = NULL;
1514                         sl->sl_num = 0;
1515                         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1516                         return;
1517                 }
1518
1519                 /* Allocate a record. UUIDs are not NUL-terminated. */
1520                 se = ch_malloc( sizeof( slog_entry ) + opc->suuid.bv_len +
1521                         op->o_csn.bv_len + 1 );
1522                 se->se_next = NULL;
1523                 se->se_tag = op->o_tag;
1524
1525                 se->se_uuid.bv_val = (char *)(&se[1]);
1526                 AC_MEMCPY( se->se_uuid.bv_val, opc->suuid.bv_val, opc->suuid.bv_len );
1527                 se->se_uuid.bv_len = opc->suuid.bv_len;
1528
1529                 se->se_csn.bv_val = se->se_uuid.bv_val + opc->suuid.bv_len;
1530                 AC_MEMCPY( se->se_csn.bv_val, op->o_csn.bv_val, op->o_csn.bv_len );
1531                 se->se_csn.bv_val[op->o_csn.bv_len] = '\0';
1532                 se->se_csn.bv_len = op->o_csn.bv_len;
1533                 se->se_sid = slap_parse_csn_sid( &se->se_csn );
1534
1535                 ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
1536                 if ( sl->sl_head ) {
1537                         /* Keep the list in csn order. */
1538                         if ( ber_bvcmp( &sl->sl_tail->se_csn, &se->se_csn ) <= 0 ) {
1539                                 sl->sl_tail->se_next = se;
1540                                 sl->sl_tail = se;
1541                         } else {
1542                                 slog_entry **sep;
1543
1544                                 for ( sep = &sl->sl_head; *sep; sep = &(*sep)->se_next ) {
1545                                         if ( ber_bvcmp( &se->se_csn, &(*sep)->se_csn ) < 0 ) {
1546                                                 se->se_next = *sep;
1547                                                 *sep = se;
1548                                                 break;
1549                                         }
1550                                 }
1551                         }
1552                 } else {
1553                         sl->sl_head = se;
1554                         sl->sl_tail = se;
1555                         if ( !sl->sl_mincsn ) {
1556                                 sl->sl_numcsns = 1;
1557                                 sl->sl_mincsn = ch_malloc( 2*sizeof( struct berval ));
1558                                 sl->sl_sids = ch_malloc( sizeof( int ));
1559                                 sl->sl_sids[0] = se->se_sid;
1560                                 ber_dupbv( sl->sl_mincsn, &se->se_csn );
1561                                 BER_BVZERO( &sl->sl_mincsn[1] );
1562                         }
1563                 }
1564                 sl->sl_num++;
1565                 while ( sl->sl_num > sl->sl_size ) {
1566                         int i, j;
1567                         se = sl->sl_head;
1568                         sl->sl_head = se->se_next;
1569                         for ( i=0; i<sl->sl_numcsns; i++ )
1570                                 if ( sl->sl_sids[i] >= se->se_sid )
1571                                         break;
1572                         if  ( i == sl->sl_numcsns || sl->sl_sids[i] != se->se_sid ) {
1573                                 slap_insert_csn_sids( (struct sync_cookie *)sl,
1574                                         i, se->se_sid, &se->se_csn );
1575                         } else {
1576                                 ber_bvreplace( &sl->sl_mincsn[i], &se->se_csn );
1577                         }
1578                         ch_free( se );
1579                         sl->sl_num--;
1580                 }
1581                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1582         }
1583 }
1584
1585 /* Just set a flag if we found the matching entry */
1586 static int
1587 playlog_cb( Operation *op, SlapReply *rs )
1588 {
1589         if ( rs->sr_type == REP_SEARCH ) {
1590                 op->o_callback->sc_private = (void *)1;
1591         }
1592         return rs->sr_err;
1593 }
1594
1595 /* enter with sl->sl_mutex locked, release before returning */
1596 static void
1597 syncprov_playlog( Operation *op, SlapReply *rs, sessionlog *sl,
1598         sync_control *srs, BerVarray ctxcsn, int numcsns, int *sids )
1599 {
1600         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1601         slog_entry *se;
1602         int i, j, ndel, num, nmods, mmods;
1603         char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1604         BerVarray uuids;
1605         struct berval delcsn[2];
1606
1607         if ( !sl->sl_num ) {
1608                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1609                 return;
1610         }
1611
1612         num = sl->sl_num;
1613         i = 0;
1614         nmods = 0;
1615
1616         uuids = op->o_tmpalloc( (num+1) * sizeof( struct berval ) +
1617                 num * UUID_LEN, op->o_tmpmemctx );
1618         uuids[0].bv_val = (char *)(uuids + num + 1);
1619
1620         delcsn[0].bv_len = 0;
1621         delcsn[0].bv_val = cbuf;
1622         BER_BVZERO(&delcsn[1]);
1623
1624         /* Make a copy of the relevant UUIDs. Put the Deletes up front
1625          * and everything else at the end. Do this first so we can
1626          * unlock the list mutex.
1627          */
1628         Debug( LDAP_DEBUG_SYNC, "srs csn %s\n",
1629                 srs->sr_state.ctxcsn[0].bv_val, 0, 0 );
1630         for ( se=sl->sl_head; se; se=se->se_next ) {
1631                 int k;
1632                 Debug( LDAP_DEBUG_SYNC, "log csn %s\n", se->se_csn.bv_val, 0, 0 );
1633                 ndel = 1;
1634                 for ( k=0; k<srs->sr_state.numcsns; k++ ) {
1635                         if ( se->se_sid == srs->sr_state.sids[k] ) {
1636                                 ndel = ber_bvcmp( &se->se_csn, &srs->sr_state.ctxcsn[k] );
1637                                 break;
1638                         }
1639                 }
1640                 if ( ndel <= 0 ) {
1641                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too old\n", ndel, 0, 0 );
1642                         continue;
1643                 }
1644                 ndel = 0;
1645                 for ( k=0; k<numcsns; k++ ) {
1646                         if ( se->se_sid == sids[k] ) {
1647                                 ndel = ber_bvcmp( &se->se_csn, &ctxcsn[k] );
1648                                 break;
1649                         }
1650                 }
1651                 if ( ndel > 0 ) {
1652                         Debug( LDAP_DEBUG_SYNC, "cmp %d, too new\n", ndel, 0, 0 );
1653                         break;
1654                 }
1655                 if ( se->se_tag == LDAP_REQ_DELETE ) {
1656                         j = i;
1657                         i++;
1658                         AC_MEMCPY( cbuf, se->se_csn.bv_val, se->se_csn.bv_len );
1659                         delcsn[0].bv_len = se->se_csn.bv_len;
1660                         delcsn[0].bv_val[delcsn[0].bv_len] = '\0';
1661                 } else {
1662                         if ( se->se_tag == LDAP_REQ_ADD )
1663                                 continue;
1664                         nmods++;
1665                         j = num - nmods;
1666                 }
1667                 uuids[j].bv_val = uuids[0].bv_val + (j * UUID_LEN);
1668                 AC_MEMCPY(uuids[j].bv_val, se->se_uuid.bv_val, UUID_LEN);
1669                 uuids[j].bv_len = UUID_LEN;
1670         }
1671         ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
1672
1673         ndel = i;
1674
1675         /* Zero out unused slots */
1676         for ( i=ndel; i < num - nmods; i++ )
1677                 uuids[i].bv_len = 0;
1678
1679         /* Mods must be validated to see if they belong in this delete set.
1680          */
1681
1682         mmods = nmods;
1683         /* Strip any duplicates */
1684         for ( i=0; i<nmods; i++ ) {
1685                 for ( j=0; j<ndel; j++ ) {
1686                         if ( bvmatch( &uuids[j], &uuids[num - 1 - i] )) {
1687                                 uuids[num - 1 - i].bv_len = 0;
1688                                 mmods --;
1689                                 break;
1690                         }
1691                 }
1692                 if ( uuids[num - 1 - i].bv_len == 0 ) continue;
1693                 for ( j=0; j<i; j++ ) {
1694                         if ( bvmatch( &uuids[num - 1 - j], &uuids[num - 1 - i] )) {
1695                                 uuids[num - 1 - i].bv_len = 0;
1696                                 mmods --;
1697                                 break;
1698                         }
1699                 }
1700         }
1701
1702         if ( mmods ) {
1703                 Operation fop;
1704                 int rc;
1705                 Filter mf, af;
1706                 AttributeAssertion eq = ATTRIBUTEASSERTION_INIT;
1707                 slap_callback cb = {0};
1708
1709                 fop = *op;
1710
1711                 fop.o_sync_mode = 0;
1712                 fop.o_callback = &cb;
1713                 fop.ors_limit = NULL;
1714                 fop.ors_tlimit = SLAP_NO_LIMIT;
1715                 fop.ors_attrs = slap_anlist_all_attributes;
1716                 fop.ors_attrsonly = 0;
1717                 fop.o_managedsait = SLAP_CONTROL_CRITICAL;
1718
1719                 af.f_choice = LDAP_FILTER_AND;
1720                 af.f_next = NULL;
1721                 af.f_and = &mf;
1722                 mf.f_choice = LDAP_FILTER_EQUALITY;
1723                 mf.f_ava = &eq;
1724                 mf.f_av_desc = slap_schema.si_ad_entryUUID;
1725                 mf.f_next = fop.ors_filter;
1726
1727                 fop.ors_filter = &af;
1728
1729                 cb.sc_response = playlog_cb;
1730                 fop.o_bd->bd_info = (BackendInfo *)on->on_info;
1731
1732                 for ( i=ndel; i<num; i++ ) {
1733                   if ( uuids[i].bv_len != 0 ) {
1734                         SlapReply frs = { REP_RESULT };
1735
1736                         mf.f_av_value = uuids[i];
1737                         cb.sc_private = NULL;
1738                         fop.ors_slimit = 1;
1739                         rc = fop.o_bd->be_search( &fop, &frs );
1740
1741                         /* If entry was not found, add to delete list */
1742                         if ( !cb.sc_private ) {
1743                                 uuids[ndel++] = uuids[i];
1744                         }
1745                   }
1746                 }
1747                 fop.o_bd->bd_info = (BackendInfo *)on;
1748         }
1749         if ( ndel ) {
1750                 struct berval cookie;
1751
1752                 if ( delcsn[0].bv_len ) {
1753                         slap_compose_sync_cookie( op, &cookie, delcsn, srs->sr_state.rid,
1754                                 slap_serverID ? slap_serverID : -1 );
1755
1756                         Debug( LDAP_DEBUG_SYNC, "syncprov_playlog: cookie=%s\n", cookie.bv_val, 0, 0 );
1757                 }
1758
1759                 uuids[ndel].bv_val = NULL;
1760                 syncprov_sendinfo( op, rs, LDAP_TAG_SYNC_ID_SET,
1761                         delcsn[0].bv_len ? &cookie : NULL, 0, uuids, 1 );
1762                 if ( delcsn[0].bv_len ) {
1763                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
1764                 }
1765         }
1766         op->o_tmpfree( uuids, op->o_tmpmemctx );
1767 }
1768
1769 static int
1770 syncprov_op_response( Operation *op, SlapReply *rs )
1771 {
1772         opcookie *opc = op->o_callback->sc_private;
1773         slap_overinst *on = opc->son;
1774         syncprov_info_t         *si = on->on_bi.bi_private;
1775         syncmatches *sm;
1776
1777         if ( rs->sr_err == LDAP_SUCCESS )
1778         {
1779                 struct berval maxcsn;
1780                 char cbuf[LDAP_PVT_CSNSTR_BUFSIZE];
1781                 int do_check = 0, have_psearches, foundit, csn_changed = 0;
1782
1783                 ldap_pvt_thread_mutex_lock( &si->si_resp_mutex );
1784
1785                 /* Update our context CSN */
1786                 cbuf[0] = '\0';
1787                 maxcsn.bv_val = cbuf;
1788                 maxcsn.bv_len = sizeof(cbuf);
1789                 ldap_pvt_thread_rdwr_wlock( &si->si_csn_rwlock );
1790
1791                 slap_get_commit_csn( op, &maxcsn, &foundit );
1792                 if ( BER_BVISEMPTY( &maxcsn ) && SLAP_GLUE_SUBORDINATE( op->o_bd )) {
1793                         /* syncrepl queues the CSN values in the db where
1794                          * it is configured , not where the changes are made.
1795                          * So look for a value in the glue db if we didn't
1796                          * find any in this db.
1797                          */
1798                         BackendDB *be = op->o_bd;
1799                         op->o_bd = select_backend( &be->be_nsuffix[0], 1);
1800                         maxcsn.bv_val = cbuf;
1801                         maxcsn.bv_len = sizeof(cbuf);
1802                         slap_get_commit_csn( op, &maxcsn, &foundit );
1803                         op->o_bd = be;
1804                 }
1805                 if ( !BER_BVISEMPTY( &maxcsn ) ) {
1806                         int i, sid;
1807 #ifdef CHECK_CSN
1808                         Syntax *syn = slap_schema.si_ad_contextCSN->ad_type->sat_syntax;
1809                         assert( !syn->ssyn_validate( syn, &maxcsn ));
1810 #endif
1811                         sid = slap_parse_csn_sid( &maxcsn );
1812                         for ( i=0; i<si->si_numcsns; i++ ) {
1813                                 if ( sid < si->si_sids[i] )
1814                                         break;
1815                                 if ( sid == si->si_sids[i] ) {
1816                                         if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn[i] ) > 0 ) {
1817                                                 ber_bvreplace( &si->si_ctxcsn[i], &maxcsn );
1818                                                 csn_changed = 1;
1819                                         }
1820                                         break;
1821                                 }
1822                         }
1823                         /* It's a new SID for us */
1824                         if ( i == si->si_numcsns || sid != si->si_sids[i] ) {
1825                                 slap_insert_csn_sids((struct sync_cookie *)&(si->si_ctxcsn),
1826                                         i, sid, &maxcsn );
1827                                 csn_changed = 1;
1828                         }
1829                 }
1830
1831                 /* Don't do any processing for consumer contextCSN updates */
1832                 if ( op->o_dont_replicate ) {
1833                         if ( op->o_tag == LDAP_REQ_MODIFY &&
1834                                 op->orm_modlist->sml_op == LDAP_MOD_REPLACE &&
1835                                 op->orm_modlist->sml_desc == slap_schema.si_ad_contextCSN ) {
1836                         /* Catch contextCSN updates from syncrepl. We have to look at
1837                          * all the attribute values, as there may be more than one csn
1838                          * that changed, and only one can be passed in the csn queue.
1839                          */
1840                         Modifications *mod = op->orm_modlist;
1841                         unsigned i;
1842                         int j, sid;
1843
1844                         for ( i=0; i<mod->sml_numvals; i++ ) {
1845                                 sid = slap_parse_csn_sid( &mod->sml_values[i] );
1846                                 for ( j=0; j<si->si_numcsns; j++ ) {
1847                                         if ( sid < si->si_sids[j] )
1848                                                 break;
1849                                         if ( sid == si->si_sids[j] ) {
1850                                                 if ( ber_bvcmp( &mod->sml_values[i], &si->si_ctxcsn[j] ) > 0 ) {
1851                                                         ber_bvreplace( &si->si_ctxcsn[j], &mod->sml_values[i] );
1852                                                         csn_changed = 1;
1853                                                 }
1854                                                 break;
1855                                         }
1856                                 }
1857
1858                                 if ( j == si->si_numcsns || sid != si->si_sids[j] ) {
1859                                         slap_insert_csn_sids( (struct sync_cookie *)&si->si_ctxcsn,
1860                                                 j, sid, &mod->sml_values[i] );
1861                                         csn_changed = 1;
1862                                 }
1863                         }
1864                         if ( csn_changed )
1865                                 si->si_dirty = 0;
1866                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1867
1868                         if ( csn_changed ) {
1869                                 syncops *ss;
1870                                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1871                                 for ( ss = si->si_ops; ss; ss = ss->s_next ) {
1872                                         if ( ss->s_op->o_abandon )
1873                                                 continue;
1874                                         /* Send the updated csn to all syncrepl consumers,
1875                                          * including the server from which it originated.
1876                                          * The syncrepl consumer and syncprov provider on
1877                                          * the originating server may be configured to store
1878                                          * their csn values in different entries.
1879                                          */
1880                                         syncprov_qresp( opc, ss, LDAP_SYNC_NEW_COOKIE );
1881                                 }
1882                                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1883                         }
1884                         } else {
1885                         ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1886                         }
1887                         goto leave;
1888                 }
1889
1890                 si->si_numops++;
1891                 if ( si->si_chkops || si->si_chktime ) {
1892                         /* Never checkpoint adding the context entry,
1893                          * it will deadlock
1894                          */
1895                         if ( op->o_tag != LDAP_REQ_ADD ||
1896                                 !dn_match( &op->o_req_ndn, &si->si_contextdn )) {
1897                                 if ( si->si_chkops && si->si_numops >= si->si_chkops ) {
1898                                         do_check = 1;
1899                                         si->si_numops = 0;
1900                                 }
1901                                 if ( si->si_chktime &&
1902                                         (op->o_time - si->si_chklast >= si->si_chktime )) {
1903                                         if ( si->si_chklast ) {
1904                                                 do_check = 1;
1905                                                 si->si_chklast = op->o_time;
1906                                         } else {
1907                                                 si->si_chklast = 1;
1908                                         }
1909                                 }
1910                         }
1911                 }
1912                 si->si_dirty = !csn_changed;
1913                 ldap_pvt_thread_rdwr_wunlock( &si->si_csn_rwlock );
1914
1915                 if ( do_check ) {
1916                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1917                         syncprov_checkpoint( op, on );
1918                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
1919                 }
1920
1921                 /* only update consumer ctx if this is a newer csn */
1922                 if ( csn_changed ) {
1923                         opc->sctxcsn = maxcsn;
1924                 }
1925
1926                 /* Handle any persistent searches */
1927                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
1928                 have_psearches = ( si->si_ops != NULL );
1929                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
1930                 if ( have_psearches ) {
1931                         switch(op->o_tag) {
1932                         case LDAP_REQ_ADD:
1933                         case LDAP_REQ_MODIFY:
1934                         case LDAP_REQ_MODRDN:
1935                         case LDAP_REQ_EXTENDED:
1936                                 syncprov_matchops( op, opc, 0 );
1937                                 break;
1938                         case LDAP_REQ_DELETE:
1939                                 /* for each match in opc->smatches:
1940                                  *   send DELETE msg
1941                                  */
1942                                 for ( sm = opc->smatches; sm; sm=sm->sm_next ) {
1943                                         if ( sm->sm_op->s_op->o_abandon )
1944                                                 continue;
1945                                         syncprov_qresp( opc, sm->sm_op, LDAP_SYNC_DELETE );
1946                                 }
1947                                 break;
1948                         }
1949                 }
1950
1951                 /* Add any log records */
1952                 if ( si->si_logs ) {
1953                         syncprov_add_slog( op );
1954                 }
1955 leave:          ldap_pvt_thread_mutex_unlock( &si->si_resp_mutex );
1956         }
1957         return SLAP_CB_CONTINUE;
1958 }
1959
1960 /* We don't use a subentry to store the context CSN any more.
1961  * We expose the current context CSN as an operational attribute
1962  * of the suffix entry.
1963  */
1964 static int
1965 syncprov_op_compare( Operation *op, SlapReply *rs )
1966 {
1967         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
1968         syncprov_info_t         *si = on->on_bi.bi_private;
1969         int rc = SLAP_CB_CONTINUE;
1970
1971         if ( dn_match( &op->o_req_ndn, &si->si_contextdn ) &&
1972                 op->oq_compare.rs_ava->aa_desc == slap_schema.si_ad_contextCSN )
1973         {
1974                 Entry e = {0};
1975                 Attribute a = {0};
1976
1977                 e.e_name = si->si_contextdn;
1978                 e.e_nname = si->si_contextdn;
1979                 e.e_attrs = &a;
1980
1981                 a.a_desc = slap_schema.si_ad_contextCSN;
1982
1983                 ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
1984
1985                 a.a_vals = si->si_ctxcsn;
1986                 a.a_nvals = a.a_vals;
1987                 a.a_numvals = si->si_numcsns;
1988
1989                 rs->sr_err = access_allowed( op, &e, op->oq_compare.rs_ava->aa_desc,
1990                         &op->oq_compare.rs_ava->aa_value, ACL_COMPARE, NULL );
1991                 if ( ! rs->sr_err ) {
1992                         rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
1993                         goto return_results;
1994                 }
1995
1996                 if ( get_assert( op ) &&
1997                         ( test_filter( op, &e, get_assertion( op ) ) != LDAP_COMPARE_TRUE ) )
1998                 {
1999                         rs->sr_err = LDAP_ASSERTION_FAILED;
2000                         goto return_results;
2001                 }
2002
2003
2004                 rs->sr_err = LDAP_COMPARE_FALSE;
2005
2006                 if ( attr_valfind( &a,
2007                         SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
2008                                 SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
2009                                 &op->oq_compare.rs_ava->aa_value, NULL, op->o_tmpmemctx ) == 0 )
2010                 {
2011                         rs->sr_err = LDAP_COMPARE_TRUE;
2012                 }
2013
2014 return_results:;
2015
2016                 ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2017
2018                 send_ldap_result( op, rs );
2019
2020                 if( rs->sr_err == LDAP_COMPARE_FALSE || rs->sr_err == LDAP_COMPARE_TRUE ) {
2021                         rs->sr_err = LDAP_SUCCESS;
2022                 }
2023                 rc = rs->sr_err;
2024         }
2025
2026         return rc;
2027 }
2028
2029 static int
2030 syncprov_op_mod( Operation *op, SlapReply *rs )
2031 {
2032         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2033         syncprov_info_t         *si = on->on_bi.bi_private;
2034         slap_callback *cb;
2035         opcookie *opc;
2036         int have_psearches, cbsize;
2037
2038         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2039         have_psearches = ( si->si_ops != NULL );
2040         si->si_active++;
2041         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2042
2043         cbsize = sizeof(slap_callback) + sizeof(opcookie) +
2044                 (have_psearches ? sizeof(modinst) : 0 );
2045
2046         cb = op->o_tmpcalloc(1, cbsize, op->o_tmpmemctx);
2047         opc = (opcookie *)(cb+1);
2048         opc->son = on;
2049         cb->sc_response = syncprov_op_response;
2050         cb->sc_cleanup = syncprov_op_cleanup;
2051         cb->sc_private = opc;
2052         cb->sc_next = op->o_callback;
2053         op->o_callback = cb;
2054
2055         opc->osid = -1;
2056         opc->rsid = -1;
2057         if ( op->o_csn.bv_val ) {
2058                 opc->osid = slap_parse_csn_sid( &op->o_csn );
2059         }
2060         if ( op->o_controls ) {
2061                 struct sync_cookie *scook =
2062                 op->o_controls[slap_cids.sc_LDAPsync];
2063                 if ( scook )
2064                         opc->rsid = scook->sid;
2065         }
2066
2067         if ( op->o_dont_replicate )
2068                 return SLAP_CB_CONTINUE;
2069
2070         /* If there are active persistent searches, lock this operation.
2071          * See seqmod.c for the locking logic on its own.
2072          */
2073         if ( have_psearches ) {
2074                 modtarget *mt, mtdummy;
2075                 modinst *mi;
2076
2077                 mi = (modinst *)(opc+1);
2078                 mi->mi_op = op;
2079
2080                 /* See if we're already modifying this entry... */
2081                 mtdummy.mt_op = op;
2082                 ldap_pvt_thread_mutex_lock( &si->si_mods_mutex );
2083                 mt = avl_find( si->si_mods, &mtdummy, sp_avl_cmp );
2084                 if ( mt ) {
2085                         ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2086                         if ( mt->mt_mods == NULL ) {
2087                                 /* Cannot reuse this mt, as another thread is about
2088                                  * to release it in syncprov_op_cleanup.
2089                                  */
2090                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2091                                 mt = NULL;
2092                         }
2093                 }
2094                 if ( mt ) {
2095                         ldap_pvt_thread_mutex_unlock( &si->si_mods_mutex );
2096                         mt->mt_tail->mi_next = mi;
2097                         mt->mt_tail = mi;
2098                         /* wait for this op to get to head of list */
2099                         while ( mt->mt_mods != mi ) {
2100                                 ldap_pvt_thread_mutex_unlock( &mt->mt_mutex );
2101                                 /* FIXME: if dynamic config can delete overlays or
2102                                  * databases we'll have to check for cleanup here.
2103                                  * Currently it's not an issue because there are
2104                                  * no dynamic config deletes...
2105                                  */
2106                                 if ( slapd_shutdown )
2107                                         return SLAPD_ABANDON;
2108
2109                                 if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2110                                         ldap_pvt_thread_yield();
2111                                 ldap_pvt_thread_mutex_lock( &mt->mt_mutex );
2112
2113                                 /* clean up if the caller is giving up */
2114                                 if ( op->o_abandon ) {
2115                                         modinst *m2;
2116                                         for ( m2 = mt->mt_mods; m2 && m2->mi_next != mi;
2117                                                 m2 = m2->mi_next );
2118                                         if ( m2 ) {
2119                                                 m2->mi_next = mi->mi_next;
2120                                                 if ( mt->mt_tail == mi ) mt->mt_tail = m2;
2121                                         }
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                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2359                 } else {
2360                         rs->sr_err = syncprov_state_ctrl( op, rs, rs->sr_entry,
2361                                 LDAP_SYNC_ADD, rs->sr_ctrls, 0, 0, NULL );
2362                 }
2363         } else if ( rs->sr_type == REP_RESULT && rs->sr_err == LDAP_SUCCESS ) {
2364                 struct berval cookie = BER_BVNULL;
2365
2366                 if ( ( ss->ss_flags & SS_CHANGED ) &&
2367                         ss->ss_ctxcsn && !BER_BVISNULL( &ss->ss_ctxcsn[0] )) {
2368                         slap_compose_sync_cookie( op, &cookie, ss->ss_ctxcsn,
2369                                 srs->sr_state.rid, slap_serverID ? slap_serverID : -1 );
2370
2371                         Debug( LDAP_DEBUG_SYNC, "syncprov_search_response: cookie=%s\n", cookie.bv_val, 0, 0 );
2372                 }
2373
2374                 /* Is this a regular refresh?
2375                  * Note: refresh never gets here if there were no changes
2376                  */
2377                 if ( !ss->ss_so ) {
2378                         rs->sr_ctrls = op->o_tmpalloc( sizeof(LDAPControl *)*2,
2379                                 op->o_tmpmemctx );
2380                         rs->sr_ctrls[1] = NULL;
2381                         rs->sr_err = syncprov_done_ctrl( op, rs, rs->sr_ctrls,
2382                                 0, 1, &cookie, ( ss->ss_flags & SS_PRESENT ) ?  LDAP_SYNC_REFRESH_PRESENTS :
2383                                         LDAP_SYNC_REFRESH_DELETES );
2384                         op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2385                 } else {
2386                 /* It's RefreshAndPersist, transition to Persist phase */
2387                         syncprov_sendinfo( op, rs, ( ss->ss_flags & SS_PRESENT ) ?
2388                                 LDAP_TAG_SYNC_REFRESH_PRESENT : LDAP_TAG_SYNC_REFRESH_DELETE,
2389                                 ( ss->ss_flags & SS_CHANGED ) ? &cookie : NULL,
2390                                 1, NULL, 0 );
2391                         if ( !BER_BVISNULL( &cookie ))
2392                                 op->o_tmpfree( cookie.bv_val, op->o_tmpmemctx );
2393
2394                         /* Detach this Op from frontend control */
2395                         ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
2396
2397                         /* But not if this connection was closed along the way */
2398                         if ( op->o_abandon ) {
2399                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2400                                 /* syncprov_ab_cleanup will free this syncop */
2401                                 return SLAPD_ABANDON;
2402
2403                         } else {
2404                                 ldap_pvt_thread_mutex_lock( &ss->ss_so->s_mutex );
2405                                 /* Turn off the refreshing flag */
2406                                 ss->ss_so->s_flags ^= PS_IS_REFRESHING;
2407
2408                                 syncprov_detach_op( op, ss->ss_so, on );
2409
2410                                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
2411
2412                                 /* If there are queued responses, fire them off */
2413                                 if ( ss->ss_so->s_res )
2414                                         syncprov_qstart( ss->ss_so );
2415                                 ldap_pvt_thread_mutex_unlock( &ss->ss_so->s_mutex );
2416                         }
2417
2418                         return LDAP_SUCCESS;
2419                 }
2420         }
2421
2422         return SLAP_CB_CONTINUE;
2423 }
2424
2425 static int
2426 syncprov_op_search( Operation *op, SlapReply *rs )
2427 {
2428         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2429         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2430         slap_callback   *cb;
2431         int gotstate = 0, changed = 0, do_present = 0;
2432         syncops *sop = NULL;
2433         searchstate *ss;
2434         sync_control *srs;
2435         BerVarray ctxcsn;
2436         int i, *sids, numcsns;
2437         struct berval mincsn, maxcsn;
2438         int minsid, maxsid;
2439         int dirty = 0;
2440
2441         if ( !(op->o_sync_mode & SLAP_SYNC_REFRESH) ) return SLAP_CB_CONTINUE;
2442
2443         if ( op->ors_deref & LDAP_DEREF_SEARCHING ) {
2444                 send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR, "illegal value for derefAliases" );
2445                 return rs->sr_err;
2446         }
2447
2448         srs = op->o_controls[slap_cids.sc_LDAPsync];
2449
2450         /* If this is a persistent search, set it up right away */
2451         if ( op->o_sync_mode & SLAP_SYNC_PERSIST ) {
2452                 syncops so = {0};
2453                 fbase_cookie fc;
2454                 opcookie opc;
2455                 slap_callback sc;
2456
2457                 fc.fss = &so;
2458                 fc.fbase = 0;
2459                 so.s_eid = NOID;
2460                 so.s_op = op;
2461                 so.s_flags = PS_IS_REFRESHING | PS_FIND_BASE;
2462                 /* syncprov_findbase expects to be called as a callback... */
2463                 sc.sc_private = &opc;
2464                 opc.son = on;
2465                 ldap_pvt_thread_mutex_init( &so.s_mutex );
2466                 cb = op->o_callback;
2467                 op->o_callback = &sc;
2468                 rs->sr_err = syncprov_findbase( op, &fc );
2469                 op->o_callback = cb;
2470                 ldap_pvt_thread_mutex_destroy( &so.s_mutex );
2471
2472                 if ( rs->sr_err != LDAP_SUCCESS ) {
2473                         send_ldap_result( op, rs );
2474                         return rs->sr_err;
2475                 }
2476                 sop = ch_malloc( sizeof( syncops ));
2477                 *sop = so;
2478                 ldap_pvt_thread_mutex_init( &sop->s_mutex );
2479                 sop->s_rid = srs->sr_state.rid;
2480                 sop->s_sid = srs->sr_state.sid;
2481                 /* set refcount=2 to prevent being freed out from under us
2482                  * by abandons that occur while we're running here
2483                  */
2484                 sop->s_inuse = 2;
2485
2486                 ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2487                 while ( si->si_active ) {
2488                         /* Wait for active mods to finish before proceeding, as they
2489                          * may already have inspected the si_ops list looking for
2490                          * consumers to replicate the change to.  Using the log
2491                          * doesn't help, as we may finish playing it before the
2492                          * active mods gets added to it.
2493                          */
2494                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2495                         if ( slapd_shutdown )
2496                                 return SLAPD_ABANDON;
2497                         if ( !ldap_pvt_thread_pool_pausecheck( &connection_pool ))
2498                                 ldap_pvt_thread_yield();
2499                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2500                 }
2501                 sop->s_next = si->si_ops;
2502                 si->si_ops = sop;
2503                 ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2504         }
2505
2506         /* snapshot the ctxcsn */
2507         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2508         numcsns = si->si_numcsns;
2509         if ( numcsns ) {
2510                 ber_bvarray_dup_x( &ctxcsn, si->si_ctxcsn, op->o_tmpmemctx );
2511                 sids = op->o_tmpalloc( numcsns * sizeof(int), op->o_tmpmemctx );
2512                 for ( i=0; i<numcsns; i++ )
2513                         sids[i] = si->si_sids[i];
2514         } else {
2515                 ctxcsn = NULL;
2516                 sids = NULL;
2517         }
2518         dirty = si->si_dirty;
2519         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2520
2521         /* If we have a cookie, handle the PRESENT lookups */
2522         if ( srs->sr_state.ctxcsn ) {
2523                 sessionlog *sl;
2524                 int i, j;
2525
2526                 /* If we don't have any CSN of our own yet, pretend nothing
2527                  * has changed.
2528                  */
2529                 if ( !numcsns )
2530                         goto no_change;
2531
2532                 if ( !si->si_nopres )
2533                         do_present = SS_PRESENT;
2534
2535                 /* If there are SIDs we don't recognize in the cookie, drop them */
2536                 for (i=0; i<srs->sr_state.numcsns; ) {
2537                         for (j=i; j<numcsns; j++) {
2538                                 if ( srs->sr_state.sids[i] <= sids[j] ) {
2539                                         break;
2540                                 }
2541                         }
2542                         /* not found */
2543                         if ( j == numcsns || srs->sr_state.sids[i] != sids[j] ) {
2544                                 char *tmp = srs->sr_state.ctxcsn[i].bv_val;
2545                                 srs->sr_state.numcsns--;
2546                                 for ( j=i; j<srs->sr_state.numcsns; j++ ) {
2547                                         srs->sr_state.ctxcsn[j] = srs->sr_state.ctxcsn[j+1];
2548                                         srs->sr_state.sids[j] = srs->sr_state.sids[j+1];
2549                                 }
2550                                 srs->sr_state.ctxcsn[j].bv_val = tmp;
2551                                 srs->sr_state.ctxcsn[j].bv_len = 0;
2552                                 continue;
2553                         }
2554                         i++;
2555                 }
2556
2557                 if (srs->sr_state.numcsns != numcsns) {
2558                         /* consumer doesn't have the right number of CSNs */
2559                         changed = SS_CHANGED;
2560                         if ( srs->sr_state.ctxcsn ) {
2561                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2562                                 srs->sr_state.ctxcsn = NULL;
2563                         }
2564                         if ( srs->sr_state.sids ) {
2565                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2566                                 srs->sr_state.sids = NULL;
2567                         }
2568                         srs->sr_state.numcsns = 0;
2569                         goto shortcut;
2570                 }
2571
2572                 /* Find the smallest CSN which differs from contextCSN */
2573                 mincsn.bv_len = 0;
2574                 maxcsn.bv_len = 0;
2575                 for ( i=0,j=0; i<srs->sr_state.numcsns; i++ ) {
2576                         int newer;
2577                         while ( srs->sr_state.sids[i] != sids[j] ) j++;
2578                         if ( BER_BVISEMPTY( &maxcsn ) || ber_bvcmp( &maxcsn,
2579                                 &srs->sr_state.ctxcsn[i] ) < 0 ) {
2580                                 maxcsn = srs->sr_state.ctxcsn[i];
2581                                 maxsid = sids[j];
2582                         }
2583                         newer = ber_bvcmp( &srs->sr_state.ctxcsn[i], &ctxcsn[j] );
2584                         /* If our state is newer, tell consumer about changes */
2585                         if ( newer < 0) {
2586                                 changed = SS_CHANGED;
2587                                 if ( BER_BVISEMPTY( &mincsn ) || ber_bvcmp( &mincsn,
2588                                         &srs->sr_state.ctxcsn[i] ) > 0 ) {
2589                                         mincsn = srs->sr_state.ctxcsn[i];
2590                                         minsid = sids[j];
2591                                 }
2592                         } else if ( newer > 0 && sids[j] == slap_serverID ) {
2593                         /* our state is older, complain to consumer */
2594                                 rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
2595                                 rs->sr_text = "consumer state is newer than provider!";
2596 bailout:
2597                                 if ( sop ) {
2598                                         syncops **sp = &si->si_ops;
2599
2600                                         ldap_pvt_thread_mutex_lock( &si->si_ops_mutex );
2601                                         while ( *sp != sop )
2602                                                 sp = &(*sp)->s_next;
2603                                         *sp = sop->s_next;
2604                                         ldap_pvt_thread_mutex_unlock( &si->si_ops_mutex );
2605                                         ch_free( sop );
2606                                 }
2607                                 rs->sr_ctrls = NULL;
2608                                 send_ldap_result( op, rs );
2609                                 return rs->sr_err;
2610                         }
2611                 }
2612                 if ( BER_BVISEMPTY( &mincsn )) {
2613                         mincsn = maxcsn;
2614                         minsid = maxsid;
2615                 }
2616
2617                 /* If nothing has changed, shortcut it */
2618                 if ( !changed && !dirty ) {
2619                         do_present = 0;
2620 no_change:              if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
2621                                 LDAPControl     *ctrls[2];
2622
2623                                 ctrls[0] = NULL;
2624                                 ctrls[1] = NULL;
2625                                 syncprov_done_ctrl( op, rs, ctrls, 0, 0,
2626                                         NULL, LDAP_SYNC_REFRESH_DELETES );
2627                                 rs->sr_ctrls = ctrls;
2628                                 rs->sr_err = LDAP_SUCCESS;
2629                                 send_ldap_result( op, rs );
2630                                 rs->sr_ctrls = NULL;
2631                                 return rs->sr_err;
2632                         }
2633                         goto shortcut;
2634                 }
2635
2636                 /* Do we have a sessionlog for this search? */
2637                 sl=si->si_logs;
2638                 if ( sl ) {
2639                         int do_play = 0;
2640                         ldap_pvt_thread_mutex_lock( &sl->sl_mutex );
2641                         /* Are there any log entries, and is the consumer state
2642                          * present in the session log?
2643                          */
2644                         if ( sl->sl_num > 0 ) {
2645                                 int i;
2646                                 for ( i=0; i<sl->sl_numcsns; i++ ) {
2647                                         /* SID not present == new enough */
2648                                         if ( minsid < sl->sl_sids[i] ) {
2649                                                 do_play = 1;
2650                                                 break;
2651                                         }
2652                                         /* SID present */
2653                                         if ( minsid == sl->sl_sids[i] ) {
2654                                                 /* new enough? */
2655                                                 if ( ber_bvcmp( &mincsn, &sl->sl_mincsn[i] ) >= 0 )
2656                                                         do_play = 1;
2657                                                 break;
2658                                         }
2659                                 }
2660                                 /* SID not present == new enough */
2661                                 if ( i == sl->sl_numcsns )
2662                                         do_play = 1;
2663                         }
2664                         if ( do_play ) {
2665                                 do_present = 0;
2666                                 /* mutex is unlocked in playlog */
2667                                 syncprov_playlog( op, rs, sl, srs, ctxcsn, numcsns, sids );
2668                         } else {
2669                                 ldap_pvt_thread_mutex_unlock( &sl->sl_mutex );
2670                         }
2671                 }
2672                 /* Is the CSN still present in the database? */
2673                 if ( syncprov_findcsn( op, FIND_CSN, &mincsn ) != LDAP_SUCCESS ) {
2674                         /* No, so a reload is required */
2675                         /* the 2.2 consumer doesn't send this hint */
2676                         if ( si->si_usehint && srs->sr_rhint == 0 ) {
2677                                 if ( ctxcsn )
2678                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2679                                 if ( sids )
2680                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2681                                 rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
2682                                 rs->sr_text = "sync cookie is stale";
2683                                 goto bailout;
2684                         }
2685                         if ( srs->sr_state.ctxcsn ) {
2686                                 ber_bvarray_free_x( srs->sr_state.ctxcsn, op->o_tmpmemctx );
2687                                 srs->sr_state.ctxcsn = NULL;
2688                         }
2689                         if ( srs->sr_state.sids ) {
2690                                 slap_sl_free( srs->sr_state.sids, op->o_tmpmemctx );
2691                                 srs->sr_state.sids = NULL;
2692                         }
2693                         srs->sr_state.numcsns = 0;
2694                 } else {
2695                         gotstate = 1;
2696                         /* If changed and doing Present lookup, send Present UUIDs */
2697                         if ( do_present && syncprov_findcsn( op, FIND_PRESENT, 0 ) !=
2698                                 LDAP_SUCCESS ) {
2699                                 if ( ctxcsn )
2700                                         ber_bvarray_free_x( ctxcsn, op->o_tmpmemctx );
2701                                 if ( sids )
2702                                         op->o_tmpfree( sids, op->o_tmpmemctx );
2703                                 goto bailout;
2704                         }
2705                 }
2706         } else {
2707                 /* No consumer state, assume something has changed */
2708                 changed = SS_CHANGED;
2709         }
2710
2711 shortcut:
2712         /* Append CSN range to search filter, save original filter
2713          * for persistent search evaluation
2714          */
2715         if ( sop ) {
2716                 ldap_pvt_thread_mutex_lock( &sop->s_mutex );
2717                 sop->s_filterstr = op->ors_filterstr;
2718                 /* correct the refcount that was set to 2 before */
2719                 sop->s_inuse--;
2720         }
2721
2722         /* If something changed, find the changes */
2723         if ( gotstate && ( changed || dirty ) ) {
2724                 Filter *fand, *fava;
2725
2726                 fand = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2727                 fand->f_choice = LDAP_FILTER_AND;
2728                 fand->f_next = NULL;
2729                 fava = op->o_tmpalloc( sizeof(Filter), op->o_tmpmemctx );
2730                 fand->f_and = fava;
2731                 fava->f_choice = LDAP_FILTER_GE;
2732                 fava->f_ava = op->o_tmpalloc( sizeof(AttributeAssertion), op->o_tmpmemctx );
2733                 fava->f_ava->aa_desc = slap_schema.si_ad_entryCSN;
2734 #ifdef LDAP_COMP_MATCH
2735                 fava->f_ava->aa_cf = NULL;
2736 #endif
2737                 ber_dupbv_x( &fava->f_ava->aa_value, &mincsn, op->o_tmpmemctx );
2738                 fava->f_next = op->ors_filter;
2739                 op->ors_filter = fand;
2740                 filter2bv_x( op, op->ors_filter, &op->ors_filterstr );
2741                 if ( sop ) {
2742                         sop->s_flags |= PS_FIX_FILTER;
2743                 }
2744         }
2745         if ( sop ) {
2746                 ldap_pvt_thread_mutex_unlock( &sop->s_mutex );
2747         }
2748
2749         /* Let our callback add needed info to returned entries */
2750         cb = op->o_tmpcalloc(1, sizeof(slap_callback)+sizeof(searchstate), op->o_tmpmemctx);
2751         ss = (searchstate *)(cb+1);
2752         ss->ss_on = on;
2753         ss->ss_so = sop;
2754         ss->ss_flags = do_present | changed;
2755         ss->ss_ctxcsn = ctxcsn;
2756         ss->ss_numcsns = numcsns;
2757         ss->ss_sids = sids;
2758         cb->sc_response = syncprov_search_response;
2759         cb->sc_cleanup = syncprov_search_cleanup;
2760         cb->sc_private = ss;
2761         cb->sc_next = op->o_callback;
2762         op->o_callback = cb;
2763
2764         /* If this is a persistent search and no changes were reported during
2765          * the refresh phase, just invoke the response callback to transition
2766          * us into persist phase
2767          */
2768         if ( !changed && !dirty ) {
2769                 rs->sr_err = LDAP_SUCCESS;
2770                 rs->sr_nentries = 0;
2771                 send_ldap_result( op, rs );
2772                 return rs->sr_err;
2773         }
2774         return SLAP_CB_CONTINUE;
2775 }
2776
2777 static int
2778 syncprov_operational(
2779         Operation *op,
2780         SlapReply *rs )
2781 {
2782         slap_overinst           *on = (slap_overinst *)op->o_bd->bd_info;
2783         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2784
2785         /* This prevents generating unnecessarily; frontend will strip
2786          * any statically stored copy.
2787          */
2788         if ( op->o_sync != SLAP_CONTROL_NONE )
2789                 return SLAP_CB_CONTINUE;
2790
2791         if ( rs->sr_entry &&
2792                 dn_match( &rs->sr_entry->e_nname, &si->si_contextdn )) {
2793
2794                 if ( SLAP_OPATTRS( rs->sr_attr_flags ) ||
2795                         ad_inlist( slap_schema.si_ad_contextCSN, rs->sr_attrs )) {
2796                         Attribute *a, **ap = NULL;
2797
2798                         for ( a=rs->sr_entry->e_attrs; a; a=a->a_next ) {
2799                                 if ( a->a_desc == slap_schema.si_ad_contextCSN )
2800                                         break;
2801                         }
2802
2803                         ldap_pvt_thread_rdwr_rlock( &si->si_csn_rwlock );
2804                         if ( si->si_ctxcsn ) {
2805                                 if ( !a ) {
2806                                         for ( ap = &rs->sr_operational_attrs; *ap;
2807                                                 ap=&(*ap)->a_next );
2808
2809                                         a = attr_alloc( slap_schema.si_ad_contextCSN );
2810                                         *ap = a;
2811                                 }
2812
2813                                 if ( !ap ) {
2814                                         if ( rs_entry2modifiable( op, rs, on )) {
2815                                                 a = attr_find( rs->sr_entry->e_attrs,
2816                                                         slap_schema.si_ad_contextCSN );
2817                                         }
2818                                         if ( a->a_nvals != a->a_vals ) {
2819                                                 ber_bvarray_free( a->a_nvals );
2820                                         }
2821                                         a->a_nvals = NULL;
2822                                         ber_bvarray_free( a->a_vals );
2823                                         a->a_vals = NULL;
2824                                         a->a_numvals = 0;
2825                                 }
2826                                 attr_valadd( a, si->si_ctxcsn, si->si_ctxcsn, si->si_numcsns );
2827                         }
2828                         ldap_pvt_thread_rdwr_runlock( &si->si_csn_rwlock );
2829                 }
2830         }
2831         return SLAP_CB_CONTINUE;
2832 }
2833
2834 enum {
2835         SP_CHKPT = 1,
2836         SP_SESSL,
2837         SP_NOPRES,
2838         SP_USEHINT
2839 };
2840
2841 static ConfigDriver sp_cf_gen;
2842
2843 static ConfigTable spcfg[] = {
2844         { "syncprov-checkpoint", "ops> <minutes", 3, 3, 0, ARG_MAGIC|SP_CHKPT,
2845                 sp_cf_gen, "( OLcfgOvAt:1.1 NAME 'olcSpCheckpoint' "
2846                         "DESC 'ContextCSN checkpoint interval in ops and minutes' "
2847                         "SYNTAX OMsDirectoryString SINGLE-VALUE )", NULL, NULL },
2848         { "syncprov-sessionlog", "ops", 2, 2, 0, ARG_INT|ARG_MAGIC|SP_SESSL,
2849                 sp_cf_gen, "( OLcfgOvAt:1.2 NAME 'olcSpSessionlog' "
2850                         "DESC 'Session log size in ops' "
2851                         "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
2852         { "syncprov-nopresent", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_NOPRES,
2853                 sp_cf_gen, "( OLcfgOvAt:1.3 NAME 'olcSpNoPresent' "
2854                         "DESC 'Omit Present phase processing' "
2855                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2856         { "syncprov-reloadhint", NULL, 2, 2, 0, ARG_ON_OFF|ARG_MAGIC|SP_USEHINT,
2857                 sp_cf_gen, "( OLcfgOvAt:1.4 NAME 'olcSpReloadHint' "
2858                         "DESC 'Observe Reload Hint in Request control' "
2859                         "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
2860         { NULL, NULL, 0, 0, 0, ARG_IGNORED }
2861 };
2862
2863 static ConfigOCs spocs[] = {
2864         { "( OLcfgOvOc:1.1 "
2865                 "NAME 'olcSyncProvConfig' "
2866                 "DESC 'SyncRepl Provider configuration' "
2867                 "SUP olcOverlayConfig "
2868                 "MAY ( olcSpCheckpoint "
2869                         "$ olcSpSessionlog "
2870                         "$ olcSpNoPresent "
2871                         "$ olcSpReloadHint "
2872                 ") )",
2873                         Cft_Overlay, spcfg },
2874         { NULL, 0, NULL }
2875 };
2876
2877 static int
2878 sp_cf_gen(ConfigArgs *c)
2879 {
2880         slap_overinst           *on = (slap_overinst *)c->bi;
2881         syncprov_info_t         *si = (syncprov_info_t *)on->on_bi.bi_private;
2882         int rc = 0;
2883
2884         if ( c->op == SLAP_CONFIG_EMIT ) {
2885                 switch ( c->type ) {
2886                 case SP_CHKPT:
2887                         if ( si->si_chkops || si->si_chktime ) {
2888                                 struct berval bv;
2889                                 /* we assume si_chktime is a multiple of 60
2890                                  * because the parsed value was originally
2891                                  * multiplied by 60 */
2892                                 bv.bv_len = snprintf( c->cr_msg, sizeof( c->cr_msg ),
2893                                         "%d %d", si->si_chkops, si->si_chktime/60 );
2894                                 if ( bv.bv_len >= sizeof( c->cr_msg ) ) {
2895                                         rc = 1;
2896                                 } else {
2897                                         bv.bv_val = c->cr_msg;
2898                                         value_add_one( &c->rvalue_vals, &bv );
2899                                 }
2900                         } else {
2901                                 rc = 1;
2902                         }
2903                         break;
2904                 case SP_SESSL:
2905                         if ( si->si_logs ) {
2906                                 c->value_int = si->si_logs->sl_size;
2907                         } else {
2908                                 rc = 1;
2909                         }
2910                         break;
2911                 case SP_NOPRES:
2912                         if ( si->si_nopres ) {
2913                                 c->value_int = 1;
2914                         } else {
2915                                 rc = 1;
2916                         }
2917                         break;
2918                 case SP_USEHINT:
2919                         if ( si->si_usehint ) {
2920                                 c->value_int = 1;
2921                         } else {
2922                                 rc = 1;
2923                         }
2924                         break;
2925                 }
2926                 return rc;
2927         } else if ( c->op == LDAP_MOD_DELETE ) {
2928                 switch ( c->type ) {
2929                 case SP_CHKPT:
2930                         si->si_chkops = 0;
2931                         si->si_chktime = 0;
2932                         break;
2933                 case SP_SESSL:
2934                         if ( si->si_logs )
2935                                 si->si_logs->sl_size = 0;
2936                         else
2937                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2938                         break;
2939                 case SP_NOPRES:
2940                         if ( si->si_nopres )
2941                                 si->si_nopres = 0;
2942                         else
2943                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2944                         break;
2945                 case SP_USEHINT:
2946                         if ( si->si_usehint )
2947                                 si->si_usehint = 0;
2948                         else
2949                                 rc = LDAP_NO_SUCH_ATTRIBUTE;
2950                         break;
2951                 }
2952                 return rc;
2953         }
2954         switch ( c->type ) {
2955         case SP_CHKPT:
2956                 if ( lutil_atoi( &si->si_chkops, c->argv[1] ) != 0 ) {
2957                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint ops # \"%s\"",
2958                                 c->argv[0], c->argv[1] );
2959                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2960                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2961                         return ARG_BAD_CONF;
2962                 }
2963                 if ( si->si_chkops <= 0 ) {
2964                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint ops # \"%d\"",
2965                                 c->argv[0], si->si_chkops );
2966                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2967                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2968                         return ARG_BAD_CONF;
2969                 }
2970                 if ( lutil_atoi( &si->si_chktime, c->argv[2] ) != 0 ) {
2971                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s unable to parse checkpoint time \"%s\"",
2972                                 c->argv[0], c->argv[1] );
2973                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2974                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2975                         return ARG_BAD_CONF;
2976                 }
2977                 if ( si->si_chktime <= 0 ) {
2978                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s invalid checkpoint time \"%d\"",
2979                                 c->argv[0], si->si_chkops );
2980                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2981                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2982                         return ARG_BAD_CONF;
2983                 }
2984                 si->si_chktime *= 60;
2985                 break;
2986         case SP_SESSL: {
2987                 sessionlog *sl;
2988                 int size = c->value_int;
2989
2990                 if ( size < 0 ) {
2991                         snprintf( c->cr_msg, sizeof( c->cr_msg ), "%s size %d is negative",
2992                                 c->argv[0], size );
2993                         Debug( LDAP_DEBUG_CONFIG|LDAP_DEBUG_NONE,
2994                                 "%s: %s\n", c->log, c->cr_msg, 0 );
2995                         return ARG_BAD_CONF;
2996                 }
2997                 sl = si->si_logs;
2998                 if ( !sl ) {
2999                         sl = ch_malloc( sizeof( sessionlog ));
3000                         sl->sl_mincsn = NULL;
3001                         sl->sl_sids = NULL;
3002                         sl->sl_num = 0;
3003                         sl->sl_numcsns = 0;
3004                         sl->sl_head = sl->sl_tail = NULL;
3005                         ldap_pvt_thread_mutex_init( &sl->sl_mutex );
3006                         si->si_logs = sl;
3007                 }
3008                 sl->sl_size = size;
3009                 }
3010                 break;
3011         case SP_NOPRES:
3012                 si->si_nopres = c->value_int;
3013                 break;
3014         case SP_USEHINT:
3015                 si->si_usehint = c->value_int;
3016                 break;
3017         }
3018         return rc;
3019 }
3020
3021 /* ITS#3456 we cannot run this search on the main thread, must use a
3022  * child thread in order to insure we have a big enough stack.
3023  */
3024 static void *
3025 syncprov_db_otask(
3026         void *ptr
3027 )
3028 {
3029         syncprov_findcsn( ptr, FIND_MAXCSN, 0 );
3030         return NULL;
3031 }
3032
3033
3034 /* Read any existing contextCSN from the underlying db.
3035  * Then search for any entries newer than that. If no value exists,
3036  * just generate it. Cache whatever result.
3037  */
3038 static int
3039 syncprov_db_open(
3040         BackendDB *be,
3041         ConfigReply *cr
3042 )
3043 {
3044         slap_overinst   *on = (slap_overinst *) be->bd_info;
3045         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3046
3047         Connection conn = { 0 };
3048         OperationBuffer opbuf;
3049         Operation *op;
3050         Entry *e = NULL;
3051         Attribute *a;
3052         int rc;
3053         void *thrctx = NULL;
3054
3055         if ( !SLAP_LASTMOD( be )) {
3056                 Debug( LDAP_DEBUG_ANY,
3057                         "syncprov_db_open: invalid config, lastmod must be enabled\n", 0, 0, 0 );
3058                 return -1;
3059         }
3060
3061         if ( slapMode & SLAP_TOOL_MODE ) {
3062                 return 0;
3063         }
3064
3065         rc = overlay_register_control( be, LDAP_CONTROL_SYNC );
3066         if ( rc ) {
3067                 return rc;
3068         }
3069
3070         thrctx = ldap_pvt_thread_pool_context();
3071         connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3072         op = &opbuf.ob_op;
3073         op->o_bd = be;
3074         op->o_dn = be->be_rootdn;
3075         op->o_ndn = be->be_rootndn;
3076
3077         if ( SLAP_SYNC_SUBENTRY( be )) {
3078                 build_new_dn( &si->si_contextdn, be->be_nsuffix,
3079                         (struct berval *)&slap_ldapsync_cn_bv, NULL );
3080         } else {
3081                 si->si_contextdn = be->be_nsuffix[0];
3082         }
3083         rc = overlay_entry_get_ov( op, &si->si_contextdn, NULL,
3084                 slap_schema.si_ad_contextCSN, 0, &e, on );
3085
3086         if ( e ) {
3087                 ldap_pvt_thread_t tid;
3088
3089                 a = attr_find( e->e_attrs, slap_schema.si_ad_contextCSN );
3090                 if ( a ) {
3091                         ber_bvarray_dup_x( &si->si_ctxcsn, a->a_vals, NULL );
3092                         si->si_numcsns = a->a_numvals;
3093                         si->si_sids = slap_parse_csn_sids( si->si_ctxcsn, a->a_numvals, NULL );
3094                         slap_sort_csn_sids( si->si_ctxcsn, si->si_sids, si->si_numcsns, NULL );
3095                 }
3096                 overlay_entry_release_ov( op, e, 0, on );
3097                 if ( si->si_ctxcsn && !SLAP_DBCLEAN( be )) {
3098                         op->o_tag = LDAP_REQ_SEARCH;
3099                         op->o_req_dn = be->be_suffix[0];
3100                         op->o_req_ndn = be->be_nsuffix[0];
3101                         op->ors_scope = LDAP_SCOPE_SUBTREE;
3102                         ldap_pvt_thread_create( &tid, 0, syncprov_db_otask, op );
3103                         ldap_pvt_thread_join( tid, NULL );
3104                 }
3105         }
3106
3107         /* Didn't find a contextCSN, should we generate one? */
3108         if ( !si->si_ctxcsn ) {
3109                 char csnbuf[ LDAP_PVT_CSNSTR_BUFSIZE ];
3110                 struct berval csn;
3111
3112                 if ( SLAP_SYNC_SHADOW( op->o_bd )) {
3113                 /* If we're also a consumer, then don't generate anything.
3114                  * Wait for our provider to send it to us, or for a local
3115                  * modify if we have multimaster.
3116                  */
3117                         goto out;
3118                 }
3119                 csn.bv_val = csnbuf;
3120                 csn.bv_len = sizeof( csnbuf );
3121                 slap_get_csn( op, &csn, 0 );
3122                 value_add_one( &si->si_ctxcsn, &csn );
3123                 si->si_numcsns = 1;
3124                 si->si_sids = ch_malloc( sizeof(int) );
3125                 si->si_sids[0] = slap_serverID;
3126
3127                 /* make sure we do a checkpoint on close */
3128                 si->si_numops++;
3129         }
3130
3131         /* Initialize the sessionlog mincsn */
3132         if ( si->si_logs && si->si_numcsns ) {
3133                 sessionlog *sl = si->si_logs;
3134                 int i;
3135                 ber_bvarray_dup_x( &sl->sl_mincsn, si->si_ctxcsn, NULL );
3136                 sl->sl_numcsns = si->si_numcsns;
3137                 sl->sl_sids = ch_malloc( si->si_numcsns * sizeof(int) );
3138                 for ( i=0; i < si->si_numcsns; i++ )
3139                         sl->sl_sids[i] = si->si_sids[i];
3140         }
3141
3142 out:
3143         op->o_bd->bd_info = (BackendInfo *)on;
3144         return 0;
3145 }
3146
3147 /* Write the current contextCSN into the underlying db.
3148  */
3149 static int
3150 syncprov_db_close(
3151         BackendDB *be,
3152         ConfigReply *cr
3153 )
3154 {
3155     slap_overinst   *on = (slap_overinst *) be->bd_info;
3156     syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3157 #ifdef SLAP_CONFIG_DELETE
3158         syncops *so, *sonext;
3159 #endif /* SLAP_CONFIG_DELETE */
3160
3161         if ( slapMode & SLAP_TOOL_MODE ) {
3162                 return 0;
3163         }
3164         if ( si->si_numops ) {
3165                 Connection conn = {0};
3166                 OperationBuffer opbuf;
3167                 Operation *op;
3168                 void *thrctx;
3169
3170                 thrctx = ldap_pvt_thread_pool_context();
3171                 connection_fake_init2( &conn, &opbuf, thrctx, 0 );
3172                 op = &opbuf.ob_op;
3173                 op->o_bd = be;
3174                 op->o_dn = be->be_rootdn;
3175                 op->o_ndn = be->be_rootndn;
3176                 syncprov_checkpoint( op, on );
3177         }
3178
3179 #ifdef SLAP_CONFIG_DELETE
3180         if ( !slapd_shutdown ) {
3181                 for ( so=si->si_ops, sonext=so;  so; so=sonext  ) {
3182                         SlapReply rs = {REP_RESULT};
3183                         rs.sr_err = LDAP_UNAVAILABLE;
3184                         send_ldap_result( so->s_op, &rs );
3185                         sonext=so->s_next;
3186                         syncprov_drop_psearch( so, 0);
3187                 }
3188                 si->si_ops=NULL;
3189         }
3190         overlay_unregister_control( be, LDAP_CONTROL_SYNC );
3191 #endif /* SLAP_CONFIG_DELETE */
3192
3193     return 0;
3194 }
3195
3196 static int
3197 syncprov_db_init(
3198         BackendDB *be,
3199         ConfigReply *cr
3200 )
3201 {
3202         slap_overinst   *on = (slap_overinst *)be->bd_info;
3203         syncprov_info_t *si;
3204
3205         if ( SLAP_ISGLOBALOVERLAY( be ) ) {
3206                 Debug( LDAP_DEBUG_ANY,
3207                         "syncprov must be instantiated within a database.\n",
3208                         0, 0, 0 );
3209                 return 1;
3210         }
3211
3212         si = ch_calloc(1, sizeof(syncprov_info_t));
3213         on->on_bi.bi_private = si;
3214         ldap_pvt_thread_rdwr_init( &si->si_csn_rwlock );
3215         ldap_pvt_thread_mutex_init( &si->si_ops_mutex );
3216         ldap_pvt_thread_mutex_init( &si->si_mods_mutex );
3217         ldap_pvt_thread_mutex_init( &si->si_resp_mutex );
3218
3219         csn_anlist[0].an_desc = slap_schema.si_ad_entryCSN;
3220         csn_anlist[0].an_name = slap_schema.si_ad_entryCSN->ad_cname;
3221         csn_anlist[1].an_desc = slap_schema.si_ad_entryUUID;
3222         csn_anlist[1].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3223
3224         uuid_anlist[0].an_desc = slap_schema.si_ad_entryUUID;
3225         uuid_anlist[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
3226
3227         return 0;
3228 }
3229
3230 static int
3231 syncprov_db_destroy(
3232         BackendDB *be,
3233         ConfigReply *cr
3234 )
3235 {
3236         slap_overinst   *on = (slap_overinst *)be->bd_info;
3237         syncprov_info_t *si = (syncprov_info_t *)on->on_bi.bi_private;
3238
3239         if ( si ) {
3240                 if ( si->si_logs ) {
3241                         sessionlog *sl = si->si_logs;
3242                         slog_entry *se = sl->sl_head;
3243
3244                         while ( se ) {
3245                                 slog_entry *se_next = se->se_next;
3246                                 ch_free( se );
3247                                 se = se_next;
3248                         }
3249                         if ( sl->sl_mincsn )
3250                                 ber_bvarray_free( sl->sl_mincsn );
3251                         if ( sl->sl_sids )
3252                                 ch_free( sl->sl_sids );
3253
3254                         ldap_pvt_thread_mutex_destroy(&si->si_logs->sl_mutex);
3255                         ch_free( si->si_logs );
3256                 }
3257                 if ( si->si_ctxcsn )
3258                         ber_bvarray_free( si->si_ctxcsn );
3259                 if ( si->si_sids )
3260                         ch_free( si->si_sids );
3261                 ldap_pvt_thread_mutex_destroy( &si->si_resp_mutex );
3262                 ldap_pvt_thread_mutex_destroy( &si->si_mods_mutex );
3263                 ldap_pvt_thread_mutex_destroy( &si->si_ops_mutex );
3264                 ldap_pvt_thread_rdwr_destroy( &si->si_csn_rwlock );
3265                 ch_free( si );
3266         }
3267
3268         return 0;
3269 }
3270
3271 static int syncprov_parseCtrl (
3272         Operation *op,
3273         SlapReply *rs,
3274         LDAPControl *ctrl )
3275 {
3276         ber_tag_t tag;
3277         BerElementBuffer berbuf;
3278         BerElement *ber = (BerElement *)&berbuf;
3279         ber_int_t mode;
3280         ber_len_t len;
3281         struct berval cookie = BER_BVNULL;
3282         sync_control *sr;
3283         int rhint = 0;
3284
3285         if ( op->o_sync != SLAP_CONTROL_NONE ) {
3286                 rs->sr_text = "Sync control specified multiple times";
3287                 return LDAP_PROTOCOL_ERROR;
3288         }
3289
3290         if ( op->o_pagedresults != SLAP_CONTROL_NONE ) {
3291                 rs->sr_text = "Sync control specified with pagedResults control";
3292                 return LDAP_PROTOCOL_ERROR;
3293         }
3294
3295         if ( BER_BVISNULL( &ctrl->ldctl_value ) ) {
3296                 rs->sr_text = "Sync control value is absent";
3297                 return LDAP_PROTOCOL_ERROR;
3298         }
3299
3300         if ( BER_BVISEMPTY( &ctrl->ldctl_value ) ) {
3301                 rs->sr_text = "Sync control value is empty";
3302                 return LDAP_PROTOCOL_ERROR;
3303         }
3304
3305         /* Parse the control value
3306          *      syncRequestValue ::= SEQUENCE {
3307          *              mode   ENUMERATED {
3308          *                      -- 0 unused
3309          *                      refreshOnly             (1),
3310          *                      -- 2 reserved
3311          *                      refreshAndPersist       (3)
3312          *              },
3313          *              cookie  syncCookie OPTIONAL
3314          *      }
3315          */
3316
3317         ber_init2( ber, &ctrl->ldctl_value, 0 );
3318
3319         if ( (tag = ber_scanf( ber, "{i" /*}*/, &mode )) == LBER_ERROR ) {
3320                 rs->sr_text = "Sync control : mode decoding error";
3321                 return LDAP_PROTOCOL_ERROR;
3322         }
3323
3324         switch( mode ) {
3325         case LDAP_SYNC_REFRESH_ONLY:
3326                 mode = SLAP_SYNC_REFRESH;
3327                 break;
3328         case LDAP_SYNC_REFRESH_AND_PERSIST:
3329                 mode = SLAP_SYNC_REFRESH_AND_PERSIST;
3330                 break;
3331         default:
3332                 rs->sr_text = "Sync control : unknown update mode";
3333                 return LDAP_PROTOCOL_ERROR;
3334         }
3335
3336         tag = ber_peek_tag( ber, &len );
3337
3338         if ( tag == LDAP_TAG_SYNC_COOKIE ) {
3339                 if (( ber_scanf( ber, /*{*/ "m", &cookie )) == LBER_ERROR ) {
3340                         rs->sr_text = "Sync control : cookie decoding error";
3341                         return LDAP_PROTOCOL_ERROR;
3342                 }
3343                 tag = ber_peek_tag( ber, &len );
3344         }
3345         if ( tag == LDAP_TAG_RELOAD_HINT ) {
3346                 if (( ber_scanf( ber, /*{*/ "b", &rhint )) == LBER_ERROR ) {
3347                         rs->sr_text = "Sync control : rhint decoding error";
3348                         return LDAP_PROTOCOL_ERROR;
3349                 }
3350         }
3351         if (( ber_scanf( ber, /*{*/ "}")) == LBER_ERROR ) {
3352                         rs->sr_text = "Sync control : decoding error";
3353                         return LDAP_PROTOCOL_ERROR;
3354         }
3355         sr = op->o_tmpcalloc( 1, sizeof(struct sync_control), op->o_tmpmemctx );
3356         sr->sr_rhint = rhint;
3357         if (!BER_BVISNULL(&cookie)) {
3358                 ber_dupbv_x( &sr->sr_state.octet_str, &cookie, op->o_tmpmemctx );
3359                 /* If parse fails, pretend no cookie was sent */
3360                 if ( slap_parse_sync_cookie( &sr->sr_state, op->o_tmpmemctx ) ||
3361                         sr->sr_state.rid == -1 ) {
3362                         if ( sr->sr_state.ctxcsn ) {
3363                                 ber_bvarray_free_x( sr->sr_state.ctxcsn, op->o_tmpmemctx );
3364                                 sr->sr_state.ctxcsn = NULL;
3365                         }
3366                         sr->sr_state.numcsns = 0;
3367                 }
3368         }
3369
3370         op->o_controls[slap_cids.sc_LDAPsync] = sr;
3371
3372         op->o_sync = ctrl->ldctl_iscritical
3373                 ? SLAP_CONTROL_CRITICAL
3374                 : SLAP_CONTROL_NONCRITICAL;
3375
3376         op->o_sync_mode |= mode;        /* o_sync_mode shares o_sync */
3377
3378         return LDAP_SUCCESS;
3379 }
3380
3381 /* This overlay is set up for dynamic loading via moduleload. For static
3382  * configuration, you'll need to arrange for the slap_overinst to be
3383  * initialized and registered by some other function inside slapd.
3384  */
3385
3386 static slap_overinst            syncprov;
3387
3388 int
3389 syncprov_initialize()
3390 {
3391         int rc;
3392
3393         rc = register_supported_control( LDAP_CONTROL_SYNC,
3394                 SLAP_CTRL_SEARCH, NULL,
3395                 syncprov_parseCtrl, &slap_cids.sc_LDAPsync );
3396         if ( rc != LDAP_SUCCESS ) {
3397                 Debug( LDAP_DEBUG_ANY,
3398                         "syncprov_init: Failed to register control %d\n", rc, 0, 0 );
3399                 return rc;
3400         }
3401
3402         syncprov.on_bi.bi_type = "syncprov";
3403         syncprov.on_bi.bi_db_init = syncprov_db_init;
3404         syncprov.on_bi.bi_db_destroy = syncprov_db_destroy;
3405         syncprov.on_bi.bi_db_open = syncprov_db_open;
3406         syncprov.on_bi.bi_db_close = syncprov_db_close;
3407
3408         syncprov.on_bi.bi_op_abandon = syncprov_op_abandon;
3409         syncprov.on_bi.bi_op_cancel = syncprov_op_abandon;
3410
3411         syncprov.on_bi.bi_op_add = syncprov_op_mod;
3412         syncprov.on_bi.bi_op_compare = syncprov_op_compare;
3413         syncprov.on_bi.bi_op_delete = syncprov_op_mod;
3414         syncprov.on_bi.bi_op_modify = syncprov_op_mod;
3415         syncprov.on_bi.bi_op_modrdn = syncprov_op_mod;
3416         syncprov.on_bi.bi_op_search = syncprov_op_search;
3417         syncprov.on_bi.bi_extended = syncprov_op_extended;
3418         syncprov.on_bi.bi_operational = syncprov_operational;
3419
3420         syncprov.on_bi.bi_cf_ocs = spocs;
3421
3422         generic_filter.f_desc = slap_schema.si_ad_objectClass;
3423
3424         rc = config_register_schema( spcfg, spocs );
3425         if ( rc ) return rc;
3426
3427         return overlay_register( &syncprov );
3428 }
3429
3430 #if SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC
3431 int
3432 init_module( int argc, char *argv[] )
3433 {
3434         return syncprov_initialize();
3435 }
3436 #endif /* SLAPD_OVER_SYNCPROV == SLAPD_MOD_DYNAMIC */
3437
3438 #endif /* defined(SLAPD_OVER_SYNCPROV) */